diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
index fe64bef..0149f6a 100644
--- a/.github/workflows/build-and-test.yml
+++ b/.github/workflows/build-and-test.yml
@@ -2,9 +2,9 @@ name: Build & Test
on:
push:
- branches: [main]
+ branches: [main, '0.x']
pull_request:
- branches: [main]
+ branches: [main, '0.x']
# Default token to read-only; jobs widen only what they need.
permissions:
@@ -21,7 +21,7 @@ jobs:
with:
egress-policy: audit
- name: Checkout
- uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+ uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
with:
persist-credentials: false
- name: Setup Node
@@ -48,7 +48,7 @@ jobs:
with:
egress-policy: audit
- name: Checkout
- uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+ uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
with:
persist-credentials: false
- name: Setup Node
@@ -58,5 +58,5 @@ jobs:
cache: npm
- run: npm ci
- run: npm run build
- - run: npx playwright install --with-deps chromium
+ - run: npx playwright install --with-deps chromium firefox webkit
- run: npm run test:browser
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 845d112..1b1325f 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -2,9 +2,9 @@ name: CodeQL
on:
push:
- branches: [main]
+ branches: [main, '0.x']
pull_request:
- branches: [main]
+ branches: [main, '0.x']
schedule:
- cron: '0 19 * * 4'
@@ -29,7 +29,7 @@ jobs:
with:
egress-policy: audit
- name: Checkout repository
- uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+ uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
with:
persist-credentials: false
- name: Initialize CodeQL
diff --git a/.github/workflows/scorecard.yml b/.github/workflows/scorecard.yml
index bc3d48d..fd3b827 100644
--- a/.github/workflows/scorecard.yml
+++ b/.github/workflows/scorecard.yml
@@ -7,11 +7,12 @@ name: Scorecard supply-chain security
on:
# For the Branch-Protection check; only the default branch is supported.
branch_protection_rule:
- # Keeps the Maintained check fresh and re-evaluates after CodeQL has settled.
+ # Keeps the Maintained check fresh and re-evaluates after CodeQL has settled. Weekly is enough:
+ # the score signals do not move day to day, and Friday lands just after the Thursday CodeQL run.
schedule:
- - cron: '24 17 * * *'
+ - cron: '24 17 * * 5'
# Lets a maintainer trigger the first run (and re-runs) by hand from the Actions
- # tab, instead of waiting for the daily cron - useful to publish the first report.
+ # tab, instead of waiting for the weekly cron - useful to publish the first report.
workflow_dispatch:
# NOTE: no 'push' trigger on purpose - running at merge time races the CodeQL
# scan of the just-merged commit and makes the SAST check read as unchecked.
@@ -38,7 +39,7 @@ jobs:
with:
egress-policy: audit
- name: Checkout code
- uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+ uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
with:
persist-credentials: false
- name: Run analysis
diff --git a/.github/workflows/sign-release.yml b/.github/workflows/sign-release.yml
index 72136ac..b4eb596 100644
--- a/.github/workflows/sign-release.yml
+++ b/.github/workflows/sign-release.yml
@@ -16,7 +16,7 @@ jobs:
- uses: step-security/harden-runner@9af89fc71515a100421586dfdb3dc9c984fbf411 # v2.19.4
with:
egress-policy: audit
- - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+ - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
with:
ref: ${{ github.event.release.tag_name }}
persist-credentials: false
diff --git a/.github/workflows/slsa-provenance.yml b/.github/workflows/slsa-provenance.yml
index a3f3616..8ba244b 100644
--- a/.github/workflows/slsa-provenance.yml
+++ b/.github/workflows/slsa-provenance.yml
@@ -17,7 +17,7 @@ jobs:
- uses: step-security/harden-runner@9af89fc71515a100421586dfdb3dc9c984fbf411 # v2.19.4
with:
egress-policy: audit
- - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+ - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
with:
ref: ${{ github.event.release.tag_name }}
persist-credentials: false
diff --git a/.gitignore b/.gitignore
index 6599235..7de2b1a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
node_modules/
+dist/fortify.cov.*
coverage/
.nyc_output/
*.log
diff --git a/README.md b/README.md
index 312a061..edfc7bd 100644
--- a/README.md
+++ b/README.md
@@ -1,39 +1,59 @@
# DOMFortify
-[](https://www.npmjs.com/package/domfortify) [](https://github.com/cure53/DOMFortify/blob/main/LICENSE)  [](https://github.com/cure53/DOMFortify/actions/workflows/build-and-test.yml) [](https://scorecard.dev/viewer/?uri=github.com/cure53/DOMFortify) [](https://badge.socket.dev/npm/package/domfortify/latest)
+[](https://www.npmjs.com/package/domfortify) [](https://github.com/cure53/DOMFortify/blob/main/LICENSE) [](https://www.npmjs.com/package/domfortify) [](https://github.com/cure53/DOMFortify/network/dependents) 
-DOMFortify turns on Trusted Types for a page and quietly takes over the browser's `default` policy,
-so that old, vulnerable code like `el.innerHTML = location.hash` gets sanitized before it ever hits
-the DOM. You don't touch the code. You don't even need to know where the bug is.
+[](https://www.bestpractices.dev/projects/13287) [](https://github.com/cure53/DOMFortify/actions/workflows/build-and-test.yml) [](https://scorecard.dev/viewer/?uri=github.com/cure53/DOMFortify) [](https://badge.socket.dev/npm/package/domfortify/latest)
-It's for the sites you can't easily fix: complex apps or legacy apps nobody wants to touch, the third-party widget you
-can't patch, the 2000+ `innerHTML` sinks written before anyone had heard of XSS.
+DOMFortify turns Trusted Types on for a page and quietly takes over the browser's `default` policy, so
+that old, vulnerable code like `el.innerHTML = location.hash` gets sanitized before it ever reaches the
+DOM. You don't touch the code. You don't even need to know where the bug is.
-**Just ship the policy, and the browser automatically protects every HTML sink with DOMPurify or other sanitizers.**
+It's for the sites you can't easily fix: sprawling apps and legacy code nobody wants to touch, the
+third-party widget you can't patch, the 2000-plus `innerHTML` sinks written before anyone had heard of
+XSS.
+
+**Ship the policy, and the browser routes every HTML sink through DOMPurify (or any sanitizer you give
+it) on its way into the DOM.**
+
+New here? The [wiki](https://github.com/cure53/DOMFortify/wiki) has the deeper docs:
+[Installation and Usage](https://github.com/cure53/DOMFortify/wiki/Installation-and-Usage),
+[How It Works](https://github.com/cure53/DOMFortify/wiki/How-It-Works) with data-flow diagrams, the
+[Security Goals and Threat Model](https://github.com/cure53/DOMFortify/wiki/Security-Goals-and-Threat-Model),
+and [Risks and Footguns](https://github.com/cure53/DOMFortify/wiki/Risks-and-Footguns).
## Is there a demo?
-Of course there is. [Play with DOMFortify](https://cure53.de/fortify) - throw payloads at a
-deliberately broken page and watch the browser neutralize them before they reach the DOM.
+Of course. [Play with DOMFortify](https://cure53.de/fortify) - throw payloads at a deliberately broken
+page and watch the browser neutralize them before they reach the DOM.
+
+There's also a [collection of standalone demos](demos/) you can read or serve locally, one per feature,
+including [URL scoping with EXCLUDE / URL_CONFIG](demos/url-config-demo.html) and the
+[INCLUDE allow-list](demos/include-demo.html).
## How it works
-Trusted Types lets a page register one `default` policy that the browser calls for every dangerous
+Trusted Types lets a page register one `default` policy that the browser consults for every dangerous
sink. DOMFortify is that policy.
-HTML goes through [DOMPurify](https://github.com/cure53/DOMPurify)
-(or any sanitizer you hand it); script sinks like `eval` and `script.src` are refused outright,
-because there is no safe way to sanitize executable code.
+HTML goes through [DOMPurify](https://github.com/cure53/DOMPurify) (or any sanitizer you hand it). Script
+sinks like `eval` and `script.src` are refused outright, because there is no safe way to sanitize
+executable code.
-## Usage
+It does two jobs and no more: own the `default` policy, and route sinks. Whether enforcement is on comes
+from a CSP - a response header, a parse-time ` `, or DOMFortify's opt-in `INJECT_META` - and either
+way DOMFortify reports honestly, through `status()`, whether the page is actually protected. For the full
+mental model with data-flow diagrams, see
+[How It Works](https://github.com/cure53/DOMFortify/wiki/How-It-Works) in the wiki.
-Two parts. First, turn enforcement on with a CSP - a response header if you can set one:
+## Quick start (CDN)
+
+Two parts. First, turn enforcement on with a CSP. A response header is the sturdiest option:
```
Content-Security-Policy: require-trusted-types-for 'script'; trusted-types default dompurify;
```
-...or via ` ` tag if you cannot set any headers:
+...or a ` ` tag when you cannot set headers (it must be present at parse time):
```html
```
-Second, load the sanitizer and then DOMFortify, **first thing in `
`**, before anything an
-attacker could reach. Pin both with SRI so a bad CDN day fails closed instead of open:
+...or, when you can place neither, let DOMFortify inject that ` ` for you with one config flag:
+
+```js
+window.DOMFortifyConfig = { INJECT_META: true };
+```
+
+This is best-effort and only takes when DOMFortify runs during the initial parse (inline, first thing
+in ``); a header or hand-placed ` ` is still sturdier. Confirm it took with
+`status().enforcementActive`. Details in [Turning enforcement on](#turning-enforcement-on-advanced).
+
+Second, load the sanitizer and then DOMFortify **first thing in ``**, before anything an attacker
+could reach. Pin both with SRI so a bad CDN day fails closed instead of open:
```html
```
-That's it. The script installs itself on load. Want to check it actually worked?
+That's it. This build installs itself on load. Check it actually worked:
```js
-DOMFortify.status().protected; // true when enforced, owning the policy, and sanitizer ready
+DOMFortify.status().protected; // true when enforced, owning the policy, and the sanitizer is ready
```
-If you have to go through a bundler, import the module build and call `init()` as early as you can -
-but understand that a bundler will not place your code first, which is the one thing this needs:
+> Pin a version you have vetted and regenerate the SRI hash whenever you change it, for example
+> `openssl dgst -sha384 -binary purify.min.js | openssl base64 -A`. The two hashes above are for the
+> exact versions named in the URLs.
+
+## Using it from npm
+
+```sh
+npm install domfortify
+```
+
+The package ships three builds and TypeScript types, picked automatically by your tooling:
+
+| Build | File | What it does |
+| ------------------- | --------------------- | ------------------------------------------------------------ |
+| ESM | `dist/fortify.es.mjs` | `import { init } from 'domfortify'` - you call `init()` |
+| CommonJS | `dist/fortify.cjs.js` | `const { init } = require('domfortify')` - you call `init()` |
+| IIFE (auto-install) | `dist/fortify.min.js` | self-installs on load; this is the `
+
+
+
+
+
+
+ DOMFortify demos / Scoping with INCLUDE
+ Scoping with INCLUDE
+
+ INCLUDE is the allow-list complement of EXCLUDE: DOMFortify activates
+ only on matching URLs and stays inactive everywhere else. This page keys off the query
+ string. ?admin is in scope, so DOMFortify claims the policy, injects the enabling
+ CSP, and sanitizes. The baseline URL is out of scope, so DOMFortify stands down and leaves the
+ page untouched.
+
+
+
+
+
+
Same payload on both URLs
+
+
Run the sink
+
Resulting HTML:
+
+
+
+
+
+
+
diff --git a/dist/fortify.cjs.js b/dist/fortify.cjs.js
index a8dc968..e044502 100644
--- a/dist/fortify.cjs.js
+++ b/dist/fortify.cjs.js
@@ -1,44 +1,53 @@
-/*! DOMFortify 0.1.0 | (c) Cure53 and contributors | (MPL-2.0 OR Apache-2.0) */
+/*! DOMFortify 0.5.0 | (c) Cure53 and contributors | (MPL-2.0 OR Apache-2.0) */
'use strict';
Object.defineProperty(exports, '__esModule', { value: true });
-const VERSION = '0.1.0';
-// Grab natives up front so later prototype-pollution or clobbering can't swap them out.
+// Cached up front so later prototype pollution or clobbering can't swap hasOwnProperty out.
const hasOwn = Object.prototype.hasOwnProperty;
-const root = typeof globalThis !== 'undefined' ? globalThis : window;
-const doc = typeof document !== 'undefined' ? document : undefined;
-const loc = root.location;
-const own = (obj, key) => obj != null && hasOwn.call(obj, key);
-const cfg = (obj, key) => (own(obj, key) ? obj[key] : undefined);
-const clip = (s) => String(s).slice(0, 80);
-const emsg = (e) => String(e?.message);
-const TT = root.trustedTypes;
-let installed = false;
-let cachedStatus = null;
-// Are we actually enforced? Under enforcement with no default policy yet, a sink write throws.
-// Run this BEFORE we install our policy, or it would always read as "off".
-function enforcementActive() {
+/** True only for an own (non-inherited) property, so a polluted prototype is never consulted. */
+function own(obj, key) {
+ return obj != null && hasOwn.call(obj, key);
+}
+/** Read an own key off a config-like object, else undefined. Never walks the prototype chain. */
+function cfg(obj, key) {
+ return own(obj, key) ? obj[key] : undefined;
+}
+/** A short, safe preview of an arbitrary value, for violation reports. */
+function clip(s) {
+ return String(s).slice(0, 80);
+}
+/**
+ * Best-effort error message, tolerant of non-Error throws. Must never throw itself: it runs inside
+ * init()'s catch and several sink catches, so a hostile error whose `message` is a throwing getter
+ * must not be able to re-throw from here and brick init(). Falls back to a constant.
+ */
+function emsg(e) {
try {
- doc.createElement('div').innerHTML = 'x';
- return false;
+ return String(e?.message);
}
catch {
- return true;
+ return 'unknown error';
}
}
-// Copy config off the caller's object, skipping keys that could pollute. Don't JSON-clone - that
-// would corrupt RegExp and functions.
+/**
+ * Copy an object's own keys, dropping the three that could pollute a prototype. Deliberately not a
+ * JSON clone: that would corrupt the RegExps and functions a sanitizer config may carry.
+ */
function shallowCopy(obj) {
const out = {};
for (const k in obj) {
- if (hasOwn.call(obj, k) && k !== '__proto__' && k !== 'constructor' && k !== 'prototype')
+ if (hasOwn.call(obj, k) && k !== '__proto__' && k !== 'constructor' && k !== 'prototype') {
out[k] = obj[k];
+ }
}
return out;
}
-// Test a URL against one or more patterns. String = substring match; RegExp = test. Used for both
-// EXCLUDE and URL_CONFIG, always against the realm's own location.href.
+/**
+ * Test a URL against one or more patterns. A string matches as a substring (the empty string never
+ * matches); a RegExp is test()ed, and a pattern that throws is treated as no match. Used for both
+ * EXCLUDE and URL_CONFIG, always against the realm's own location.href.
+ */
function urlMatches(pattern, url) {
if (pattern == null)
return false;
@@ -55,24 +64,53 @@ function urlMatches(pattern, url) {
return true;
}
catch {
- /* ignore a pattern that throws */
+ /* a pattern that throws is treated as no match */
}
}
}
return false;
}
-// Best-effort CSP injection (opt-in). IMPORTANT: a CSP is honored only when the PARSER
-// inserts it, so document.write during the initial parse is the only path that can actually switch
-// enforcement on - and only for content parsed afterwards. A node appended after parsing is ignored by
-// the CSP engine; we still add it (harmless) but report that injection did NOT take. Returns true only
-// when written during parse.
+
+/**
+ * DOMFortify - bolt Trusted Types onto a legacy page so old DOM-XSS sinks get sanitized
+ * without touching the code. See README for the full picture; the short version:
+ *
+ * - Claims the realm's `default` Trusted Types policy and routes every HTML sink through a
+ * sanitizer. Script sinks (eval, javascript: URLs, script.src) are refused.
+ * - Does NOT switch enforcement on; a CSP does (header best, ` ` works).
+ * - Must load FIRST: the default policy is winner-takes-all.
+ * - Fails closed: no sanitizer means sinks throw, never leak.
+ * - Only covers Trusted Types sinks; inline handlers / style / URL props stay open.
+ */
+const VERSION = '0.5.0';
+// Natives captured up front, so later prototype pollution or clobbering can't swap them out.
+const root = typeof globalThis !== 'undefined' ? globalThis : window;
+const doc = typeof document !== 'undefined' ? document : undefined;
+const loc = root.location;
+const TT = root.trustedTypes;
+let installed = false;
+let cachedStatus = null;
+// --- environment probes --------------------------------------------------------------------------
+// Are we actually enforced? Under enforcement with no default policy yet, a sink write throws. Must
+// run BEFORE we install our policy, or it would always read as "off".
+function enforcementActive() {
+ try {
+ doc.createElement('div').innerHTML = 'x';
+ return false;
+ }
+ catch {
+ return true;
+ }
+}
+// Best-effort CSP injection (opt-in). A CSP is honored only when the PARSER inserts it,
+// so document.write during the initial parse is the one path that can switch enforcement on - and only
+// for content parsed afterwards. We return true only on that path. After parse we still append the node
+// (harmless) but report that it did NOT take.
//
-// `content` is the trusted CSP directive built from config (the derived default, or META_DIRECTIVE).
-// META_DIRECTIVE is developer-controlled and is expected to be trusted, but since this path reaches
-// document.write we still strip the characters that could break out of the content="..." attribute or
-// the tag. A real CSP directive never contains ", <, >, or newlines (single quotes, e.g.
-// 'script', are kept - they are harmless inside the double-quoted attribute), so this is lossless for
-// valid input and neutralizes a hostile or malformed directive. Defense in depth.
+// `content` is the trusted directive built from config. META_DIRECTIVE is developer-controlled, but
+// because this path reaches document.write we still strip the characters that could break out of the
+// content="..." attribute. A valid directive never contains ", <, >, or newlines, so the strip is
+// lossless for good input and neutralizes a hostile or malformed one. Defense in depth.
function injectMeta(content) {
if (!doc)
return false;
@@ -99,108 +137,80 @@ function injectMeta(content) {
}
return false;
}
-function init(options = {}) {
- if (installed)
- return cachedStatus;
- installed = true;
- const onv = cfg(options, 'ON_VIOLATION');
- const report = (typeof onv === 'function' ? onv : () => { });
- const status = {
- version: VERSION,
- ttSupported: !!TT,
- enforcementActive: false,
- defaultPolicyOwned: false,
- sanitizerReady: false,
- excluded: false,
- metaInjected: false,
- protected: false,
- reason: '',
- };
- const done = (reason, code) => {
- status.protected = status.defaultPolicyOwned && status.enforcementActive && status.sanitizerReady;
- status.reason = reason;
- if (code)
- report(code, status);
- cachedStatus = Object.freeze({ ...status });
- return cachedStatus;
- };
- const url = loc && typeof loc.href !== 'undefined' ? String(loc.href) : '';
- // EXCLUDE: on a matching URL, DOMFortify stays completely out of the way - no policy, no meta. It
- // does NOT install a passthrough (that would be a silent XSS hole); under globally delivered
- // enforcement, excluded pages are the developer's responsibility. Reported via status.excluded.
- if (urlMatches(cfg(options, 'EXCLUDE'), url)) {
- status.excluded = true;
- return done('URL matched EXCLUDE; DOMFortify is intentionally inactive on this page.', 'excluded-by-url');
- }
- if (!TT || typeof TT.createPolicy !== 'function') {
- return done('Trusted Types not supported; library is inert. Sinks are NOT routed.', 'tt-unsupported');
- }
- // URL_CONFIG: the first rule whose `match` hits supplies per-URL overrides. `eff(key)` reads that
- // rule's own key when present, else falls back to the base config - both own-key only, so a polluted
- // prototype can neither inject a rule nor loosen a refusal.
- let override = null;
+// --- config resolution (all own-key only, so a polluted prototype can't loosen anything) ---------
+// First URL_CONFIG rule whose `match` hits, else null. Own-key reads only, so a polluted prototype
+// can neither inject a rule nor reach one.
+function selectOverride(options, url) {
const rules = cfg(options, 'URL_CONFIG');
- if (Array.isArray(rules)) {
- for (let i = 0; i < rules.length; i++) {
- const r = rules[i];
- if (r && urlMatches(r.match, url)) {
- override = r;
- break;
- }
+ if (!Array.isArray(rules))
+ return null;
+ for (let i = 0; i < rules.length; i++) {
+ const r = rules[i];
+ // Read `match` own-key only, so a polluted Object.prototype.match can't make a rule that lacks
+ // its own match apply to every URL.
+ if (r && typeof r === 'object' && urlMatches(cfg(r, 'match'), url)) {
+ return r;
}
}
- const eff = (key) => (override && own(override, key) ? override[key] : cfg(options, key));
- // INJECT_META (opt-in, best-effort - see injectMeta and the README). We only attempt it when TT is
- // supported; the directive lists the policies that will exist: our own `default`, plus `dompurify`
- // unless a bare-function sanitizer (e.g. the native Sanitizer API) is in use. META_DIRECTIVE overrides.
- if (cfg(options, 'INJECT_META') === true) {
- const md = cfg(options, 'META_DIRECTIVE');
- const ttNames = typeof eff('SANITIZER') === 'function' ? 'default' : 'default dompurify';
- const directive = typeof md === 'string' && md ? md : `require-trusted-types-for 'script'; trusted-types ${ttNames};`;
- status.metaInjected = injectMeta(directive);
- report('meta-injection-attempted', { directive, written: status.metaInjected });
- }
- status.enforcementActive = enforcementActive();
- // Resolve config once, reading own keys only so a polluted prototype can't supply a value - and,
- // most importantly, can't loosen a refusal. Nothing is re-read later, so runtime clobbering can't
- // retarget the policy either. URL_CONFIG overrides are applied here via `eff`.
- let rawSan = eff('SANITIZER');
- if (rawSan === undefined)
- rawSan = root.DOMPurify;
- // DOMPurify's export is itself a callable function (the factory) that also exposes `.sanitize`, so
- // check for a `.sanitize` method FIRST - otherwise we'd wrap the factory and call the wrong thing. A
- // bare function (e.g. a Sanitizer-API adapter) has no `.sanitize` and falls through to the function case.
- const DP = rawSan && typeof rawSan.sanitize === 'function'
- ? rawSan
- : typeof rawSan === 'function'
- ? { sanitize: rawSan }
- : null;
- const rawCfg = eff('SANITIZER_CONFIG');
- const sanitizeConfig = rawCfg && typeof rawCfg === 'object' ? shallowCopy(rawCfg) : undefined;
- // Sink openers count only if they're own functions, so prototype pollution can never open a sink.
- const asCand = eff('ALLOW_SCRIPT');
- const asuCand = eff('ALLOW_SCRIPT_URL');
- const allowScript = typeof asCand === 'function' ? asCand : null;
- const allowScriptURL = typeof asuCand === 'function' ? asuCand : null;
- // Smoke-test once so a broken sanitizer fails loudly here, not silently on the first real write. It
- // must return a string - a sanitizer that returns anything else would otherwise inject junk.
- let sanitizerReady = false;
- if (DP && typeof DP.sanitize === 'function') {
- try {
- sanitizerReady = typeof DP.sanitize('x ', sanitizeConfig) === 'string';
- if (!sanitizerReady)
- report('sanitizer-smoketest-failed', { error: 'sanitize() did not return a string' });
- }
- catch (e) {
- report('sanitizer-smoketest-failed', { error: emsg(e) });
+ return null;
+}
+// Does `raw` carry a `.sanitize` method of its own (or on its own class prototype), as opposed to one
+// merely inherited from Object.prototype? We walk the chain but STOP before Object.prototype, so a
+// polluted Object.prototype.sanitize is never mistaken for a real sanitizer. Class-based sanitizers,
+// whose method lives on their own prototype below Object.prototype, still qualify. Tolerant of a
+// hostile getter on the lookup path, which is treated as "not a sanitizer".
+function looksLikeSanitizer(raw) {
+ try {
+ for (let o = raw; o && o !== Object.prototype; o = Object.getPrototypeOf(o)) {
+ if (own(o, 'sanitize'))
+ return typeof o.sanitize === 'function';
}
}
- status.sanitizerReady = sanitizerReady;
- // `reentry` is true only while the sanitizer parses our input internally - inert and synchronous - so
- // handing the raw string straight back is safe, and keeps us alive if its own sink re-enters us.
+ catch {
+ /* a throwing getter on the chain means we cannot trust it as a sanitizer */
+ }
+ return false;
+}
+// Normalize whatever the caller handed us into a sanitizer with a `.sanitize` method, or null.
+// DOMPurify's export is itself a callable factory that ALSO carries `.sanitize`, so we must check for
+// `.sanitize` FIRST - otherwise we'd wrap the factory and call the wrong thing. A bare function (e.g. a
+// Sanitizer-API adapter) has no `.sanitize` and falls through to the function case.
+function resolveSanitizer(raw) {
+ if (raw && looksLikeSanitizer(raw))
+ return raw;
+ if (typeof raw === 'function')
+ return { sanitize: raw };
+ return null;
+}
+// The trusted-types directive for INJECT_META. META_DIRECTIVE wins; otherwise we list the policies
+// that will exist: our own `default`, plus `dompurify` unless a bare-function sanitizer is in use.
+function metaDirective(md, functionSanitizer) {
+ if (typeof md === 'string' && md)
+ return md;
+ const ttNames = functionSanitizer ? 'default' : 'default dompurify';
+ return `require-trusted-types-for 'script'; trusted-types ${ttNames};`;
+}
+// Exercise the sanitizer once so a broken one fails loudly here, not silently on the first real write.
+// It must return a string; anything else would inject junk into every sink.
+function smokeTest(sanitizer, config) {
+ try {
+ const out = sanitizer.sanitize('x ', config);
+ return typeof out === 'string'
+ ? { ready: true, error: null }
+ : { ready: false, error: 'sanitize() did not return a string' };
+ }
+ catch (e) {
+ return { ready: false, error: emsg(e) };
+ }
+}
+// --- the default policy --------------------------------------------------------------------------
+// createHTML: route through the sanitizer, fail closed on any problem. `reentry` is true only while
+// the sanitizer parses our input internally (inert and synchronous), so handing the raw string back
+// is safe and keeps us alive if the sanitizer's own sink re-enters us.
+function makeSanitizeHTML(sanitizer, config, ready, report) {
let reentry = false;
- const sanitizeHTML = (s) => {
- if (!sanitizerReady) {
+ return (s) => {
+ if (!ready) {
report('sanitizer-unavailable', { sink: 'createHTML' });
return null; // fail closed
}
@@ -208,7 +218,7 @@ function init(options = {}) {
return s;
try {
reentry = true;
- return DP.sanitize(s, sanitizeConfig);
+ return sanitizer.sanitize(s, config);
}
catch (e) {
report('sanitize-threw', { error: emsg(e) });
@@ -218,9 +228,11 @@ function init(options = {}) {
reentry = false;
}
};
- // Code has no safe subset, so refuse by default. A caller hook may allow specific values; if it throws
- // or returns a non-string, we refuse.
- const scriptHook = (kind, fn) => (s) => {
+}
+// createScript / createScriptURL: code has no safe subset, so refuse by default. A caller hook may
+// allow specific values; if it throws or returns a non-string, we refuse.
+function makeScriptHook(kind, fn, report) {
+ return (s) => {
if (fn) {
let r;
try {
@@ -238,39 +250,141 @@ function init(options = {}) {
report('script-sink-refused', { sink: kind, sample: clip(s) });
return null;
};
- const policyDef = {
- createHTML: sanitizeHTML,
- createScript: scriptHook('createScript', allowScript),
- createScriptURL: scriptHook('createScriptURL', allowScriptURL),
+}
+// --- public entry point --------------------------------------------------------------------------
+function init(options = {}) {
+ if (installed)
+ return cachedStatus;
+ installed = true;
+ // The violation reporter is observability, never control flow. Wrap it so a throwing ON_VIOLATION
+ // can neither abort init() (which would leave us installed with a null status) nor turn a
+ // fail-closed sink - one that should quietly return null - into a thrown exception.
+ const onv = cfg(options, 'ON_VIOLATION');
+ const report = typeof onv === 'function'
+ ? (code, detail) => {
+ try {
+ onv(code, detail);
+ }
+ catch {
+ /* a misbehaving reporter must never break the policy */
+ }
+ }
+ : () => { };
+ const status = {
+ version: VERSION,
+ ttSupported: !!TT,
+ enforcementActive: false,
+ defaultPolicyOwned: false,
+ sanitizerReady: false,
+ excluded: false,
+ metaInjected: false,
+ protected: false,
+ reason: '',
+ };
+ const done = (reason, code) => {
+ status.protected = status.defaultPolicyOwned && status.enforcementActive && status.sanitizerReady;
+ status.reason = reason;
+ // Freeze the snapshot first, then report it: the reporter sees exactly the authoritative status
+ // that gets cached and returned, and has no window to mutate the cached copy.
+ cachedStatus = Object.freeze({ ...status });
+ if (code)
+ report(code, cachedStatus);
+ return cachedStatus;
};
- // Did someone grab the default slot first? We can't evict them and won't vouch for them.
- if (TT.defaultPolicy) {
- return done('A default Trusted Types policy already exists; DOMFortify did NOT install and cannot vouch for it. ' +
- 'Load DOMFortify first, inline in .', 'preexisting-default-policy');
- }
- let ours;
try {
- ours = TT.createPolicy('default', policyDef);
+ const url = loc && typeof loc.href !== 'undefined' ? String(loc.href) : '';
+ // EXCLUDE: on a match, stay completely out of the way - no policy, no meta. We do NOT install a
+ // passthrough (that would be a silent XSS hole); under globally delivered enforcement, excluded
+ // pages are the developer's responsibility. Reported via status.excluded.
+ if (urlMatches(cfg(options, 'EXCLUDE'), url)) {
+ status.excluded = true;
+ return done('URL matched EXCLUDE; DOMFortify is intentionally inactive on this page.', 'excluded-by-url');
+ }
+ // INCLUDE: the allow-list complement of EXCLUDE. When set, activate ONLY on matching URLs and stay
+ // inactive (no policy, no meta) elsewhere. EXCLUDE is checked first, so it wins for URLs matching
+ // both. Like EXCLUDE, this only scopes activation safely when enforcement is page-scoped too.
+ const include = cfg(options, 'INCLUDE');
+ if (include != null && !urlMatches(include, url)) {
+ status.excluded = true;
+ return done('URL is outside INCLUDE scope; DOMFortify is intentionally inactive on this page.', 'outside-include-scope');
+ }
+ if (!TT || typeof TT.createPolicy !== 'function') {
+ return done('Trusted Types not supported; library is inert. Sinks are NOT routed.', 'tt-unsupported');
+ }
+ // Resolve config once. `eff(key)` reads the matching URL_CONFIG rule's own key when present, else the
+ // base config - both own-key only. Nothing is re-read later, so runtime clobbering can't retarget
+ // the policy after this point either.
+ const override = selectOverride(options, url);
+ const eff = (key) => (override && own(override, key) ? override[key] : cfg(options, key));
+ // INJECT_META (opt-in, best-effort - see injectMeta and the README).
+ if (cfg(options, 'INJECT_META') === true) {
+ const directive = metaDirective(cfg(options, 'META_DIRECTIVE'), typeof eff('SANITIZER') === 'function');
+ status.metaInjected = injectMeta(directive);
+ report('meta-injection-attempted', { directive, written: status.metaInjected });
+ }
+ status.enforcementActive = enforcementActive();
+ // Sanitizer: explicit SANITIZER (possibly per-URL), else window.DOMPurify. Config is forwarded
+ // verbatim as the second argument, copied to drop pollution-prone keys.
+ let rawSan = eff('SANITIZER');
+ if (rawSan === undefined)
+ rawSan = root.DOMPurify;
+ const sanitizer = resolveSanitizer(rawSan);
+ const rawCfg = eff('SANITIZER_CONFIG');
+ const sanitizeConfig = rawCfg && typeof rawCfg === 'object' ? shallowCopy(rawCfg) : undefined;
+ // Sink openers count only if they're own functions, so prototype pollution can never open a sink.
+ const asCand = eff('ALLOW_SCRIPT');
+ const asuCand = eff('ALLOW_SCRIPT_URL');
+ const allowScript = typeof asCand === 'function' ? asCand : null;
+ const allowScriptURL = typeof asuCand === 'function' ? asuCand : null;
+ let sanitizerReady = false;
+ if (sanitizer) {
+ const result = smokeTest(sanitizer, sanitizeConfig);
+ sanitizerReady = result.ready;
+ if (!result.ready)
+ report('sanitizer-smoketest-failed', { error: result.error });
+ }
+ status.sanitizerReady = sanitizerReady;
+ // createHTML closes over sanitizeConfig; the script hooks refuse unless an own-function hook allows.
+ const policyDef = {
+ createHTML: makeSanitizeHTML(sanitizer, sanitizeConfig, sanitizerReady, report),
+ createScript: makeScriptHook('createScript', allowScript, report),
+ createScriptURL: makeScriptHook('createScriptURL', allowScriptURL, report),
+ };
+ // Did someone grab the default slot first? We can't evict them and won't vouch for them.
+ if (TT.defaultPolicy) {
+ return done('A default Trusted Types policy already exists; DOMFortify did NOT install and cannot vouch for it. ' +
+ 'Load DOMFortify first, inline in .', 'preexisting-default-policy');
+ }
+ let ours;
+ try {
+ ours = TT.createPolicy('default', policyDef);
+ }
+ catch (e) {
+ // Throws when a default policy exists and 'allow-duplicates' is off - someone won the race.
+ return done(`createPolicy("default") threw (${emsg(e)}); another default policy won the race.`, 'default-policy-lost');
+ }
+ // With 'allow-duplicates' the create can succeed yet not be the active default.
+ if (TT.defaultPolicy && TT.defaultPolicy !== ours) {
+ return done('Our policy was created but is not the active default (allow-duplicates race lost). ' +
+ 'Remove "allow-duplicates" from the trusted-types directive.', 'default-policy-not-active');
+ }
+ status.defaultPolicyOwned = true;
+ if (!status.enforcementActive) {
+ return done('Default policy installed and slot locked, but TT enforcement is NOT active - sinks are not routed. ' +
+ 'Deliver require-trusted-types-for (header preferred).', 'enforcement-inactive');
+ }
+ if (!sanitizerReady) {
+ return done('Enforcement active and slot locked, but the sanitizer is unavailable - HTML sinks will THROW ' +
+ '(failing closed). Bundle DOMPurify and load it before DOMFortify.', 'failing-closed');
+ }
+ return done(`Active: HTML sinks sanitized, script sinks ${allowScript || allowScriptURL ? 'partly allowed by hooks' : 'refused'}.`);
}
catch (e) {
- // Throws when a default policy exists and 'allow-duplicates' is off - someone won the race.
- return done(`createPolicy("default") threw (${emsg(e)}); another default policy won the race.`, 'default-policy-lost');
- }
- // With 'allow-duplicates' the create can succeed yet not be the active default.
- if (TT.defaultPolicy && TT.defaultPolicy !== ours) {
- return done('Our policy was created but is not the active default (allow-duplicates race lost). ' +
- 'Remove "allow-duplicates" from the trusted-types directive.', 'default-policy-not-active');
- }
- status.defaultPolicyOwned = true;
- if (!status.enforcementActive) {
- return done('Default policy installed and slot locked, but TT enforcement is NOT active - sinks are not routed. ' +
- 'Deliver require-trusted-types-for (header preferred).', 'enforcement-inactive');
- }
- if (!sanitizerReady) {
- return done('Enforcement active and slot locked, but the sanitizer is unavailable - HTML sinks will THROW ' +
- '(failing closed). Bundle DOMPurify and load it before DOMFortify.', 'failing-closed');
+ // Defense in depth: init() must never throw or leave the library bricked with a null status. A
+ // hostile getter or exotic environment that slips past the guards above fails closed here, with a
+ // real status object still cached and returned.
+ return done(`init() hit an unexpected error (${emsg(e)}); failing closed.`, 'failing-closed');
}
- return done(`Active: HTML sinks sanitized, script sinks ${allowScript || allowScriptURL ? 'partly allowed by hooks' : 'refused'}.`);
}
function status() {
return cachedStatus;
diff --git a/dist/fortify.cjs.js.map b/dist/fortify.cjs.js.map
index c52529f..2548294 100644
--- a/dist/fortify.cjs.js.map
+++ b/dist/fortify.cjs.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/dist/fortify.d.ts b/dist/fortify.d.ts
index c05e889..558ff4b 100644
--- a/dist/fortify.d.ts
+++ b/dist/fortify.d.ts
@@ -25,7 +25,7 @@ interface UrlConfigRule {
ALLOW_SCRIPT_URL?: ScriptHook;
}
/** Notable events emitted to `ON_VIOLATION`. */
-type ViolationCode = 'tt-unsupported' | 'sanitizer-smoketest-failed' | 'sanitizer-unavailable' | 'sanitize-threw' | 'script-hook-threw' | 'script-sink-allowed' | 'script-sink-refused' | 'preexisting-default-policy' | 'default-policy-lost' | 'default-policy-not-active' | 'enforcement-inactive' | 'excluded-by-url' | 'meta-injection-attempted' | 'failing-closed';
+type ViolationCode = 'tt-unsupported' | 'sanitizer-smoketest-failed' | 'sanitizer-unavailable' | 'sanitize-threw' | 'script-hook-threw' | 'script-sink-allowed' | 'script-sink-refused' | 'preexisting-default-policy' | 'default-policy-lost' | 'default-policy-not-active' | 'enforcement-inactive' | 'excluded-by-url' | 'outside-include-scope' | 'meta-injection-attempted' | 'failing-closed';
interface DOMFortifyConfig {
/** Object with `.sanitize`, or a bare function. Defaults to `window.DOMPurify`. */
SANITIZER?: Sanitizer | SanitizeFn;
@@ -42,6 +42,15 @@ interface DOMFortifyConfig {
* meta. Matched against `location.href` (string = substring, RegExp = test).
*/
EXCLUDE?: UrlPattern | UrlPattern[];
+ /**
+ * Allow-list complement of `EXCLUDE`. When set, DOMFortify activates ONLY on URLs that match and
+ * stays completely inactive (no policy, no meta) everywhere else - useful for scoping a rollout to
+ * specific routes. `EXCLUDE` still wins for a URL that matches both. Matched against `location.href`
+ * (string = substring, RegExp = test). Best paired with page-scoped enforcement (e.g. INJECT_META):
+ * under a globally delivered enforcement header, non-included pages have enforcement on but no
+ * default policy, so their sinks fail closed.
+ */
+ INCLUDE?: UrlPattern | UrlPattern[];
/** Per-URL configuration overrides; the first matching rule's keys override the base config. */
URL_CONFIG?: UrlConfigRule[];
/**
@@ -64,7 +73,7 @@ interface DOMFortifyStatus {
defaultPolicyOwned: boolean;
/** Whether the sanitizer passed its smoke test. */
sanitizerReady: boolean;
- /** Whether the current URL matched `EXCLUDE` (DOMFortify intentionally inactive). */
+ /** Whether the URL is out of scope (matched `EXCLUDE`, or fell outside `INCLUDE`); inactive here. */
excluded: boolean;
/** Whether a CSP ` ` injection was attempted via document.write this load. */
metaInjected: boolean;
@@ -78,18 +87,6 @@ interface DOMFortifyApi {
status(): Readonly | null;
}
-/**
- * DOMFortify - bolt Trusted Types onto a legacy page so old DOM-XSS sinks get sanitized
- * without touching the code. See README for the full picture; the short version:
- *
- * - Claims the realm's `default` Trusted Types policy and routes every HTML sink through a
- * sanitizer. Script sinks (eval, javascript: URLs, script.src) are refused.
- * - Does NOT switch enforcement on; a CSP does (header best, ` ` works).
- * - Must load FIRST: the default policy is winner-takes-all.
- * - Fails closed: no sanitizer means sinks throw, never leak.
- * - Only covers Trusted Types sinks; inline handlers / style / URL props stay open.
- */
-
declare function init(options?: DOMFortifyConfig): Readonly;
declare function status(): Readonly | null;
declare const DOMFortify: DOMFortifyApi;
diff --git a/dist/fortify.es.mjs b/dist/fortify.es.mjs
index 53d3432..30eae02 100644
--- a/dist/fortify.es.mjs
+++ b/dist/fortify.es.mjs
@@ -1,40 +1,49 @@
-/*! DOMFortify 0.1.0 | (c) Cure53 and contributors | (MPL-2.0 OR Apache-2.0) */
-const VERSION = '0.1.0';
-// Grab natives up front so later prototype-pollution or clobbering can't swap them out.
+/*! DOMFortify 0.5.0 | (c) Cure53 and contributors | (MPL-2.0 OR Apache-2.0) */
+// Cached up front so later prototype pollution or clobbering can't swap hasOwnProperty out.
const hasOwn = Object.prototype.hasOwnProperty;
-const root = typeof globalThis !== 'undefined' ? globalThis : window;
-const doc = typeof document !== 'undefined' ? document : undefined;
-const loc = root.location;
-const own = (obj, key) => obj != null && hasOwn.call(obj, key);
-const cfg = (obj, key) => (own(obj, key) ? obj[key] : undefined);
-const clip = (s) => String(s).slice(0, 80);
-const emsg = (e) => String(e?.message);
-const TT = root.trustedTypes;
-let installed = false;
-let cachedStatus = null;
-// Are we actually enforced? Under enforcement with no default policy yet, a sink write throws.
-// Run this BEFORE we install our policy, or it would always read as "off".
-function enforcementActive() {
+/** True only for an own (non-inherited) property, so a polluted prototype is never consulted. */
+function own(obj, key) {
+ return obj != null && hasOwn.call(obj, key);
+}
+/** Read an own key off a config-like object, else undefined. Never walks the prototype chain. */
+function cfg(obj, key) {
+ return own(obj, key) ? obj[key] : undefined;
+}
+/** A short, safe preview of an arbitrary value, for violation reports. */
+function clip(s) {
+ return String(s).slice(0, 80);
+}
+/**
+ * Best-effort error message, tolerant of non-Error throws. Must never throw itself: it runs inside
+ * init()'s catch and several sink catches, so a hostile error whose `message` is a throwing getter
+ * must not be able to re-throw from here and brick init(). Falls back to a constant.
+ */
+function emsg(e) {
try {
- doc.createElement('div').innerHTML = 'x';
- return false;
+ return String(e?.message);
}
catch {
- return true;
+ return 'unknown error';
}
}
-// Copy config off the caller's object, skipping keys that could pollute. Don't JSON-clone - that
-// would corrupt RegExp and functions.
+/**
+ * Copy an object's own keys, dropping the three that could pollute a prototype. Deliberately not a
+ * JSON clone: that would corrupt the RegExps and functions a sanitizer config may carry.
+ */
function shallowCopy(obj) {
const out = {};
for (const k in obj) {
- if (hasOwn.call(obj, k) && k !== '__proto__' && k !== 'constructor' && k !== 'prototype')
+ if (hasOwn.call(obj, k) && k !== '__proto__' && k !== 'constructor' && k !== 'prototype') {
out[k] = obj[k];
+ }
}
return out;
}
-// Test a URL against one or more patterns. String = substring match; RegExp = test. Used for both
-// EXCLUDE and URL_CONFIG, always against the realm's own location.href.
+/**
+ * Test a URL against one or more patterns. A string matches as a substring (the empty string never
+ * matches); a RegExp is test()ed, and a pattern that throws is treated as no match. Used for both
+ * EXCLUDE and URL_CONFIG, always against the realm's own location.href.
+ */
function urlMatches(pattern, url) {
if (pattern == null)
return false;
@@ -51,24 +60,53 @@ function urlMatches(pattern, url) {
return true;
}
catch {
- /* ignore a pattern that throws */
+ /* a pattern that throws is treated as no match */
}
}
}
return false;
}
-// Best-effort CSP injection (opt-in). IMPORTANT: a CSP is honored only when the PARSER
-// inserts it, so document.write during the initial parse is the only path that can actually switch
-// enforcement on - and only for content parsed afterwards. A node appended after parsing is ignored by
-// the CSP engine; we still add it (harmless) but report that injection did NOT take. Returns true only
-// when written during parse.
+
+/**
+ * DOMFortify - bolt Trusted Types onto a legacy page so old DOM-XSS sinks get sanitized
+ * without touching the code. See README for the full picture; the short version:
+ *
+ * - Claims the realm's `default` Trusted Types policy and routes every HTML sink through a
+ * sanitizer. Script sinks (eval, javascript: URLs, script.src) are refused.
+ * - Does NOT switch enforcement on; a CSP does (header best, ` ` works).
+ * - Must load FIRST: the default policy is winner-takes-all.
+ * - Fails closed: no sanitizer means sinks throw, never leak.
+ * - Only covers Trusted Types sinks; inline handlers / style / URL props stay open.
+ */
+const VERSION = '0.5.0';
+// Natives captured up front, so later prototype pollution or clobbering can't swap them out.
+const root = typeof globalThis !== 'undefined' ? globalThis : window;
+const doc = typeof document !== 'undefined' ? document : undefined;
+const loc = root.location;
+const TT = root.trustedTypes;
+let installed = false;
+let cachedStatus = null;
+// --- environment probes --------------------------------------------------------------------------
+// Are we actually enforced? Under enforcement with no default policy yet, a sink write throws. Must
+// run BEFORE we install our policy, or it would always read as "off".
+function enforcementActive() {
+ try {
+ doc.createElement('div').innerHTML = 'x';
+ return false;
+ }
+ catch {
+ return true;
+ }
+}
+// Best-effort CSP injection (opt-in). A CSP is honored only when the PARSER inserts it,
+// so document.write during the initial parse is the one path that can switch enforcement on - and only
+// for content parsed afterwards. We return true only on that path. After parse we still append the node
+// (harmless) but report that it did NOT take.
//
-// `content` is the trusted CSP directive built from config (the derived default, or META_DIRECTIVE).
-// META_DIRECTIVE is developer-controlled and is expected to be trusted, but since this path reaches
-// document.write we still strip the characters that could break out of the content="..." attribute or
-// the tag. A real CSP directive never contains ", <, >, or newlines (single quotes, e.g.
-// 'script', are kept - they are harmless inside the double-quoted attribute), so this is lossless for
-// valid input and neutralizes a hostile or malformed directive. Defense in depth.
+// `content` is the trusted directive built from config. META_DIRECTIVE is developer-controlled, but
+// because this path reaches document.write we still strip the characters that could break out of the
+// content="..." attribute. A valid directive never contains ", <, >, or newlines, so the strip is
+// lossless for good input and neutralizes a hostile or malformed one. Defense in depth.
function injectMeta(content) {
if (!doc)
return false;
@@ -95,108 +133,80 @@ function injectMeta(content) {
}
return false;
}
-function init(options = {}) {
- if (installed)
- return cachedStatus;
- installed = true;
- const onv = cfg(options, 'ON_VIOLATION');
- const report = (typeof onv === 'function' ? onv : () => { });
- const status = {
- version: VERSION,
- ttSupported: !!TT,
- enforcementActive: false,
- defaultPolicyOwned: false,
- sanitizerReady: false,
- excluded: false,
- metaInjected: false,
- protected: false,
- reason: '',
- };
- const done = (reason, code) => {
- status.protected = status.defaultPolicyOwned && status.enforcementActive && status.sanitizerReady;
- status.reason = reason;
- if (code)
- report(code, status);
- cachedStatus = Object.freeze({ ...status });
- return cachedStatus;
- };
- const url = loc && typeof loc.href !== 'undefined' ? String(loc.href) : '';
- // EXCLUDE: on a matching URL, DOMFortify stays completely out of the way - no policy, no meta. It
- // does NOT install a passthrough (that would be a silent XSS hole); under globally delivered
- // enforcement, excluded pages are the developer's responsibility. Reported via status.excluded.
- if (urlMatches(cfg(options, 'EXCLUDE'), url)) {
- status.excluded = true;
- return done('URL matched EXCLUDE; DOMFortify is intentionally inactive on this page.', 'excluded-by-url');
- }
- if (!TT || typeof TT.createPolicy !== 'function') {
- return done('Trusted Types not supported; library is inert. Sinks are NOT routed.', 'tt-unsupported');
- }
- // URL_CONFIG: the first rule whose `match` hits supplies per-URL overrides. `eff(key)` reads that
- // rule's own key when present, else falls back to the base config - both own-key only, so a polluted
- // prototype can neither inject a rule nor loosen a refusal.
- let override = null;
+// --- config resolution (all own-key only, so a polluted prototype can't loosen anything) ---------
+// First URL_CONFIG rule whose `match` hits, else null. Own-key reads only, so a polluted prototype
+// can neither inject a rule nor reach one.
+function selectOverride(options, url) {
const rules = cfg(options, 'URL_CONFIG');
- if (Array.isArray(rules)) {
- for (let i = 0; i < rules.length; i++) {
- const r = rules[i];
- if (r && urlMatches(r.match, url)) {
- override = r;
- break;
- }
+ if (!Array.isArray(rules))
+ return null;
+ for (let i = 0; i < rules.length; i++) {
+ const r = rules[i];
+ // Read `match` own-key only, so a polluted Object.prototype.match can't make a rule that lacks
+ // its own match apply to every URL.
+ if (r && typeof r === 'object' && urlMatches(cfg(r, 'match'), url)) {
+ return r;
}
}
- const eff = (key) => (override && own(override, key) ? override[key] : cfg(options, key));
- // INJECT_META (opt-in, best-effort - see injectMeta and the README). We only attempt it when TT is
- // supported; the directive lists the policies that will exist: our own `default`, plus `dompurify`
- // unless a bare-function sanitizer (e.g. the native Sanitizer API) is in use. META_DIRECTIVE overrides.
- if (cfg(options, 'INJECT_META') === true) {
- const md = cfg(options, 'META_DIRECTIVE');
- const ttNames = typeof eff('SANITIZER') === 'function' ? 'default' : 'default dompurify';
- const directive = typeof md === 'string' && md ? md : `require-trusted-types-for 'script'; trusted-types ${ttNames};`;
- status.metaInjected = injectMeta(directive);
- report('meta-injection-attempted', { directive, written: status.metaInjected });
- }
- status.enforcementActive = enforcementActive();
- // Resolve config once, reading own keys only so a polluted prototype can't supply a value - and,
- // most importantly, can't loosen a refusal. Nothing is re-read later, so runtime clobbering can't
- // retarget the policy either. URL_CONFIG overrides are applied here via `eff`.
- let rawSan = eff('SANITIZER');
- if (rawSan === undefined)
- rawSan = root.DOMPurify;
- // DOMPurify's export is itself a callable function (the factory) that also exposes `.sanitize`, so
- // check for a `.sanitize` method FIRST - otherwise we'd wrap the factory and call the wrong thing. A
- // bare function (e.g. a Sanitizer-API adapter) has no `.sanitize` and falls through to the function case.
- const DP = rawSan && typeof rawSan.sanitize === 'function'
- ? rawSan
- : typeof rawSan === 'function'
- ? { sanitize: rawSan }
- : null;
- const rawCfg = eff('SANITIZER_CONFIG');
- const sanitizeConfig = rawCfg && typeof rawCfg === 'object' ? shallowCopy(rawCfg) : undefined;
- // Sink openers count only if they're own functions, so prototype pollution can never open a sink.
- const asCand = eff('ALLOW_SCRIPT');
- const asuCand = eff('ALLOW_SCRIPT_URL');
- const allowScript = typeof asCand === 'function' ? asCand : null;
- const allowScriptURL = typeof asuCand === 'function' ? asuCand : null;
- // Smoke-test once so a broken sanitizer fails loudly here, not silently on the first real write. It
- // must return a string - a sanitizer that returns anything else would otherwise inject junk.
- let sanitizerReady = false;
- if (DP && typeof DP.sanitize === 'function') {
- try {
- sanitizerReady = typeof DP.sanitize('x ', sanitizeConfig) === 'string';
- if (!sanitizerReady)
- report('sanitizer-smoketest-failed', { error: 'sanitize() did not return a string' });
- }
- catch (e) {
- report('sanitizer-smoketest-failed', { error: emsg(e) });
+ return null;
+}
+// Does `raw` carry a `.sanitize` method of its own (or on its own class prototype), as opposed to one
+// merely inherited from Object.prototype? We walk the chain but STOP before Object.prototype, so a
+// polluted Object.prototype.sanitize is never mistaken for a real sanitizer. Class-based sanitizers,
+// whose method lives on their own prototype below Object.prototype, still qualify. Tolerant of a
+// hostile getter on the lookup path, which is treated as "not a sanitizer".
+function looksLikeSanitizer(raw) {
+ try {
+ for (let o = raw; o && o !== Object.prototype; o = Object.getPrototypeOf(o)) {
+ if (own(o, 'sanitize'))
+ return typeof o.sanitize === 'function';
}
}
- status.sanitizerReady = sanitizerReady;
- // `reentry` is true only while the sanitizer parses our input internally - inert and synchronous - so
- // handing the raw string straight back is safe, and keeps us alive if its own sink re-enters us.
+ catch {
+ /* a throwing getter on the chain means we cannot trust it as a sanitizer */
+ }
+ return false;
+}
+// Normalize whatever the caller handed us into a sanitizer with a `.sanitize` method, or null.
+// DOMPurify's export is itself a callable factory that ALSO carries `.sanitize`, so we must check for
+// `.sanitize` FIRST - otherwise we'd wrap the factory and call the wrong thing. A bare function (e.g. a
+// Sanitizer-API adapter) has no `.sanitize` and falls through to the function case.
+function resolveSanitizer(raw) {
+ if (raw && looksLikeSanitizer(raw))
+ return raw;
+ if (typeof raw === 'function')
+ return { sanitize: raw };
+ return null;
+}
+// The trusted-types directive for INJECT_META. META_DIRECTIVE wins; otherwise we list the policies
+// that will exist: our own `default`, plus `dompurify` unless a bare-function sanitizer is in use.
+function metaDirective(md, functionSanitizer) {
+ if (typeof md === 'string' && md)
+ return md;
+ const ttNames = functionSanitizer ? 'default' : 'default dompurify';
+ return `require-trusted-types-for 'script'; trusted-types ${ttNames};`;
+}
+// Exercise the sanitizer once so a broken one fails loudly here, not silently on the first real write.
+// It must return a string; anything else would inject junk into every sink.
+function smokeTest(sanitizer, config) {
+ try {
+ const out = sanitizer.sanitize('x ', config);
+ return typeof out === 'string'
+ ? { ready: true, error: null }
+ : { ready: false, error: 'sanitize() did not return a string' };
+ }
+ catch (e) {
+ return { ready: false, error: emsg(e) };
+ }
+}
+// --- the default policy --------------------------------------------------------------------------
+// createHTML: route through the sanitizer, fail closed on any problem. `reentry` is true only while
+// the sanitizer parses our input internally (inert and synchronous), so handing the raw string back
+// is safe and keeps us alive if the sanitizer's own sink re-enters us.
+function makeSanitizeHTML(sanitizer, config, ready, report) {
let reentry = false;
- const sanitizeHTML = (s) => {
- if (!sanitizerReady) {
+ return (s) => {
+ if (!ready) {
report('sanitizer-unavailable', { sink: 'createHTML' });
return null; // fail closed
}
@@ -204,7 +214,7 @@ function init(options = {}) {
return s;
try {
reentry = true;
- return DP.sanitize(s, sanitizeConfig);
+ return sanitizer.sanitize(s, config);
}
catch (e) {
report('sanitize-threw', { error: emsg(e) });
@@ -214,9 +224,11 @@ function init(options = {}) {
reentry = false;
}
};
- // Code has no safe subset, so refuse by default. A caller hook may allow specific values; if it throws
- // or returns a non-string, we refuse.
- const scriptHook = (kind, fn) => (s) => {
+}
+// createScript / createScriptURL: code has no safe subset, so refuse by default. A caller hook may
+// allow specific values; if it throws or returns a non-string, we refuse.
+function makeScriptHook(kind, fn, report) {
+ return (s) => {
if (fn) {
let r;
try {
@@ -234,39 +246,141 @@ function init(options = {}) {
report('script-sink-refused', { sink: kind, sample: clip(s) });
return null;
};
- const policyDef = {
- createHTML: sanitizeHTML,
- createScript: scriptHook('createScript', allowScript),
- createScriptURL: scriptHook('createScriptURL', allowScriptURL),
+}
+// --- public entry point --------------------------------------------------------------------------
+function init(options = {}) {
+ if (installed)
+ return cachedStatus;
+ installed = true;
+ // The violation reporter is observability, never control flow. Wrap it so a throwing ON_VIOLATION
+ // can neither abort init() (which would leave us installed with a null status) nor turn a
+ // fail-closed sink - one that should quietly return null - into a thrown exception.
+ const onv = cfg(options, 'ON_VIOLATION');
+ const report = typeof onv === 'function'
+ ? (code, detail) => {
+ try {
+ onv(code, detail);
+ }
+ catch {
+ /* a misbehaving reporter must never break the policy */
+ }
+ }
+ : () => { };
+ const status = {
+ version: VERSION,
+ ttSupported: !!TT,
+ enforcementActive: false,
+ defaultPolicyOwned: false,
+ sanitizerReady: false,
+ excluded: false,
+ metaInjected: false,
+ protected: false,
+ reason: '',
+ };
+ const done = (reason, code) => {
+ status.protected = status.defaultPolicyOwned && status.enforcementActive && status.sanitizerReady;
+ status.reason = reason;
+ // Freeze the snapshot first, then report it: the reporter sees exactly the authoritative status
+ // that gets cached and returned, and has no window to mutate the cached copy.
+ cachedStatus = Object.freeze({ ...status });
+ if (code)
+ report(code, cachedStatus);
+ return cachedStatus;
};
- // Did someone grab the default slot first? We can't evict them and won't vouch for them.
- if (TT.defaultPolicy) {
- return done('A default Trusted Types policy already exists; DOMFortify did NOT install and cannot vouch for it. ' +
- 'Load DOMFortify first, inline in .', 'preexisting-default-policy');
- }
- let ours;
try {
- ours = TT.createPolicy('default', policyDef);
+ const url = loc && typeof loc.href !== 'undefined' ? String(loc.href) : '';
+ // EXCLUDE: on a match, stay completely out of the way - no policy, no meta. We do NOT install a
+ // passthrough (that would be a silent XSS hole); under globally delivered enforcement, excluded
+ // pages are the developer's responsibility. Reported via status.excluded.
+ if (urlMatches(cfg(options, 'EXCLUDE'), url)) {
+ status.excluded = true;
+ return done('URL matched EXCLUDE; DOMFortify is intentionally inactive on this page.', 'excluded-by-url');
+ }
+ // INCLUDE: the allow-list complement of EXCLUDE. When set, activate ONLY on matching URLs and stay
+ // inactive (no policy, no meta) elsewhere. EXCLUDE is checked first, so it wins for URLs matching
+ // both. Like EXCLUDE, this only scopes activation safely when enforcement is page-scoped too.
+ const include = cfg(options, 'INCLUDE');
+ if (include != null && !urlMatches(include, url)) {
+ status.excluded = true;
+ return done('URL is outside INCLUDE scope; DOMFortify is intentionally inactive on this page.', 'outside-include-scope');
+ }
+ if (!TT || typeof TT.createPolicy !== 'function') {
+ return done('Trusted Types not supported; library is inert. Sinks are NOT routed.', 'tt-unsupported');
+ }
+ // Resolve config once. `eff(key)` reads the matching URL_CONFIG rule's own key when present, else the
+ // base config - both own-key only. Nothing is re-read later, so runtime clobbering can't retarget
+ // the policy after this point either.
+ const override = selectOverride(options, url);
+ const eff = (key) => (override && own(override, key) ? override[key] : cfg(options, key));
+ // INJECT_META (opt-in, best-effort - see injectMeta and the README).
+ if (cfg(options, 'INJECT_META') === true) {
+ const directive = metaDirective(cfg(options, 'META_DIRECTIVE'), typeof eff('SANITIZER') === 'function');
+ status.metaInjected = injectMeta(directive);
+ report('meta-injection-attempted', { directive, written: status.metaInjected });
+ }
+ status.enforcementActive = enforcementActive();
+ // Sanitizer: explicit SANITIZER (possibly per-URL), else window.DOMPurify. Config is forwarded
+ // verbatim as the second argument, copied to drop pollution-prone keys.
+ let rawSan = eff('SANITIZER');
+ if (rawSan === undefined)
+ rawSan = root.DOMPurify;
+ const sanitizer = resolveSanitizer(rawSan);
+ const rawCfg = eff('SANITIZER_CONFIG');
+ const sanitizeConfig = rawCfg && typeof rawCfg === 'object' ? shallowCopy(rawCfg) : undefined;
+ // Sink openers count only if they're own functions, so prototype pollution can never open a sink.
+ const asCand = eff('ALLOW_SCRIPT');
+ const asuCand = eff('ALLOW_SCRIPT_URL');
+ const allowScript = typeof asCand === 'function' ? asCand : null;
+ const allowScriptURL = typeof asuCand === 'function' ? asuCand : null;
+ let sanitizerReady = false;
+ if (sanitizer) {
+ const result = smokeTest(sanitizer, sanitizeConfig);
+ sanitizerReady = result.ready;
+ if (!result.ready)
+ report('sanitizer-smoketest-failed', { error: result.error });
+ }
+ status.sanitizerReady = sanitizerReady;
+ // createHTML closes over sanitizeConfig; the script hooks refuse unless an own-function hook allows.
+ const policyDef = {
+ createHTML: makeSanitizeHTML(sanitizer, sanitizeConfig, sanitizerReady, report),
+ createScript: makeScriptHook('createScript', allowScript, report),
+ createScriptURL: makeScriptHook('createScriptURL', allowScriptURL, report),
+ };
+ // Did someone grab the default slot first? We can't evict them and won't vouch for them.
+ if (TT.defaultPolicy) {
+ return done('A default Trusted Types policy already exists; DOMFortify did NOT install and cannot vouch for it. ' +
+ 'Load DOMFortify first, inline in .', 'preexisting-default-policy');
+ }
+ let ours;
+ try {
+ ours = TT.createPolicy('default', policyDef);
+ }
+ catch (e) {
+ // Throws when a default policy exists and 'allow-duplicates' is off - someone won the race.
+ return done(`createPolicy("default") threw (${emsg(e)}); another default policy won the race.`, 'default-policy-lost');
+ }
+ // With 'allow-duplicates' the create can succeed yet not be the active default.
+ if (TT.defaultPolicy && TT.defaultPolicy !== ours) {
+ return done('Our policy was created but is not the active default (allow-duplicates race lost). ' +
+ 'Remove "allow-duplicates" from the trusted-types directive.', 'default-policy-not-active');
+ }
+ status.defaultPolicyOwned = true;
+ if (!status.enforcementActive) {
+ return done('Default policy installed and slot locked, but TT enforcement is NOT active - sinks are not routed. ' +
+ 'Deliver require-trusted-types-for (header preferred).', 'enforcement-inactive');
+ }
+ if (!sanitizerReady) {
+ return done('Enforcement active and slot locked, but the sanitizer is unavailable - HTML sinks will THROW ' +
+ '(failing closed). Bundle DOMPurify and load it before DOMFortify.', 'failing-closed');
+ }
+ return done(`Active: HTML sinks sanitized, script sinks ${allowScript || allowScriptURL ? 'partly allowed by hooks' : 'refused'}.`);
}
catch (e) {
- // Throws when a default policy exists and 'allow-duplicates' is off - someone won the race.
- return done(`createPolicy("default") threw (${emsg(e)}); another default policy won the race.`, 'default-policy-lost');
- }
- // With 'allow-duplicates' the create can succeed yet not be the active default.
- if (TT.defaultPolicy && TT.defaultPolicy !== ours) {
- return done('Our policy was created but is not the active default (allow-duplicates race lost). ' +
- 'Remove "allow-duplicates" from the trusted-types directive.', 'default-policy-not-active');
- }
- status.defaultPolicyOwned = true;
- if (!status.enforcementActive) {
- return done('Default policy installed and slot locked, but TT enforcement is NOT active - sinks are not routed. ' +
- 'Deliver require-trusted-types-for (header preferred).', 'enforcement-inactive');
- }
- if (!sanitizerReady) {
- return done('Enforcement active and slot locked, but the sanitizer is unavailable - HTML sinks will THROW ' +
- '(failing closed). Bundle DOMPurify and load it before DOMFortify.', 'failing-closed');
+ // Defense in depth: init() must never throw or leave the library bricked with a null status. A
+ // hostile getter or exotic environment that slips past the guards above fails closed here, with a
+ // real status object still cached and returned.
+ return done(`init() hit an unexpected error (${emsg(e)}); failing closed.`, 'failing-closed');
}
- return done(`Active: HTML sinks sanitized, script sinks ${allowScript || allowScriptURL ? 'partly allowed by hooks' : 'refused'}.`);
}
function status() {
return cachedStatus;
diff --git a/dist/fortify.es.mjs.map b/dist/fortify.es.mjs.map
index c28b7ab..7ed7599 100644
--- a/dist/fortify.es.mjs.map
+++ b/dist/fortify.es.mjs.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/dist/fortify.js b/dist/fortify.js
index afa7c59..6aaff18 100644
--- a/dist/fortify.js
+++ b/dist/fortify.js
@@ -1,43 +1,52 @@
-/*! DOMFortify 0.1.0 | (c) Cure53 and contributors | (MPL-2.0 OR Apache-2.0) */
+/*! DOMFortify 0.5.0 | (c) Cure53 and contributors | (MPL-2.0 OR Apache-2.0) */
(function () {
'use strict';
- const VERSION = '0.1.0';
- // Grab natives up front so later prototype-pollution or clobbering can't swap them out.
+ // Cached up front so later prototype pollution or clobbering can't swap hasOwnProperty out.
const hasOwn = Object.prototype.hasOwnProperty;
- const root = typeof globalThis !== 'undefined' ? globalThis : window;
- const doc = typeof document !== 'undefined' ? document : undefined;
- const loc = root.location;
- const own = (obj, key) => obj != null && hasOwn.call(obj, key);
- const cfg = (obj, key) => (own(obj, key) ? obj[key] : undefined);
- const clip = (s) => String(s).slice(0, 80);
- const emsg = (e) => String(e?.message);
- const TT = root.trustedTypes;
- let installed = false;
- let cachedStatus = null;
- // Are we actually enforced? Under enforcement with no default policy yet, a sink write throws.
- // Run this BEFORE we install our policy, or it would always read as "off".
- function enforcementActive() {
+ /** True only for an own (non-inherited) property, so a polluted prototype is never consulted. */
+ function own(obj, key) {
+ return obj != null && hasOwn.call(obj, key);
+ }
+ /** Read an own key off a config-like object, else undefined. Never walks the prototype chain. */
+ function cfg(obj, key) {
+ return own(obj, key) ? obj[key] : undefined;
+ }
+ /** A short, safe preview of an arbitrary value, for violation reports. */
+ function clip(s) {
+ return String(s).slice(0, 80);
+ }
+ /**
+ * Best-effort error message, tolerant of non-Error throws. Must never throw itself: it runs inside
+ * init()'s catch and several sink catches, so a hostile error whose `message` is a throwing getter
+ * must not be able to re-throw from here and brick init(). Falls back to a constant.
+ */
+ function emsg(e) {
try {
- doc.createElement('div').innerHTML = 'x';
- return false;
+ return String(e?.message);
}
catch {
- return true;
+ return 'unknown error';
}
}
- // Copy config off the caller's object, skipping keys that could pollute. Don't JSON-clone - that
- // would corrupt RegExp and functions.
+ /**
+ * Copy an object's own keys, dropping the three that could pollute a prototype. Deliberately not a
+ * JSON clone: that would corrupt the RegExps and functions a sanitizer config may carry.
+ */
function shallowCopy(obj) {
const out = {};
for (const k in obj) {
- if (hasOwn.call(obj, k) && k !== '__proto__' && k !== 'constructor' && k !== 'prototype')
+ if (hasOwn.call(obj, k) && k !== '__proto__' && k !== 'constructor' && k !== 'prototype') {
out[k] = obj[k];
+ }
}
return out;
}
- // Test a URL against one or more patterns. String = substring match; RegExp = test. Used for both
- // EXCLUDE and URL_CONFIG, always against the realm's own location.href.
+ /**
+ * Test a URL against one or more patterns. A string matches as a substring (the empty string never
+ * matches); a RegExp is test()ed, and a pattern that throws is treated as no match. Used for both
+ * EXCLUDE and URL_CONFIG, always against the realm's own location.href.
+ */
function urlMatches(pattern, url) {
if (pattern == null)
return false;
@@ -54,24 +63,53 @@
return true;
}
catch {
- /* ignore a pattern that throws */
+ /* a pattern that throws is treated as no match */
}
}
}
return false;
}
- // Best-effort CSP injection (opt-in). IMPORTANT: a CSP is honored only when the PARSER
- // inserts it, so document.write during the initial parse is the only path that can actually switch
- // enforcement on - and only for content parsed afterwards. A node appended after parsing is ignored by
- // the CSP engine; we still add it (harmless) but report that injection did NOT take. Returns true only
- // when written during parse.
+
+ /**
+ * DOMFortify - bolt Trusted Types onto a legacy page so old DOM-XSS sinks get sanitized
+ * without touching the code. See README for the full picture; the short version:
+ *
+ * - Claims the realm's `default` Trusted Types policy and routes every HTML sink through a
+ * sanitizer. Script sinks (eval, javascript: URLs, script.src) are refused.
+ * - Does NOT switch enforcement on; a CSP does (header best, ` ` works).
+ * - Must load FIRST: the default policy is winner-takes-all.
+ * - Fails closed: no sanitizer means sinks throw, never leak.
+ * - Only covers Trusted Types sinks; inline handlers / style / URL props stay open.
+ */
+ const VERSION = '0.5.0';
+ // Natives captured up front, so later prototype pollution or clobbering can't swap them out.
+ const root = typeof globalThis !== 'undefined' ? globalThis : window;
+ const doc = typeof document !== 'undefined' ? document : undefined;
+ const loc = root.location;
+ const TT = root.trustedTypes;
+ let installed = false;
+ let cachedStatus = null;
+ // --- environment probes --------------------------------------------------------------------------
+ // Are we actually enforced? Under enforcement with no default policy yet, a sink write throws. Must
+ // run BEFORE we install our policy, or it would always read as "off".
+ function enforcementActive() {
+ try {
+ doc.createElement('div').innerHTML = 'x';
+ return false;
+ }
+ catch {
+ return true;
+ }
+ }
+ // Best-effort CSP injection (opt-in). A CSP is honored only when the PARSER inserts it,
+ // so document.write during the initial parse is the one path that can switch enforcement on - and only
+ // for content parsed afterwards. We return true only on that path. After parse we still append the node
+ // (harmless) but report that it did NOT take.
//
- // `content` is the trusted CSP directive built from config (the derived default, or META_DIRECTIVE).
- // META_DIRECTIVE is developer-controlled and is expected to be trusted, but since this path reaches
- // document.write we still strip the characters that could break out of the content="..." attribute or
- // the tag. A real CSP directive never contains ", <, >, or newlines (single quotes, e.g.
- // 'script', are kept - they are harmless inside the double-quoted attribute), so this is lossless for
- // valid input and neutralizes a hostile or malformed directive. Defense in depth.
+ // `content` is the trusted directive built from config. META_DIRECTIVE is developer-controlled, but
+ // because this path reaches document.write we still strip the characters that could break out of the
+ // content="..." attribute. A valid directive never contains ", <, >, or newlines, so the strip is
+ // lossless for good input and neutralizes a hostile or malformed one. Defense in depth.
function injectMeta(content) {
if (!doc)
return false;
@@ -98,108 +136,80 @@
}
return false;
}
- function init(options = {}) {
- if (installed)
- return cachedStatus;
- installed = true;
- const onv = cfg(options, 'ON_VIOLATION');
- const report = (typeof onv === 'function' ? onv : () => { });
- const status = {
- version: VERSION,
- ttSupported: !!TT,
- enforcementActive: false,
- defaultPolicyOwned: false,
- sanitizerReady: false,
- excluded: false,
- metaInjected: false,
- protected: false,
- reason: '',
- };
- const done = (reason, code) => {
- status.protected = status.defaultPolicyOwned && status.enforcementActive && status.sanitizerReady;
- status.reason = reason;
- if (code)
- report(code, status);
- cachedStatus = Object.freeze({ ...status });
- return cachedStatus;
- };
- const url = loc && typeof loc.href !== 'undefined' ? String(loc.href) : '';
- // EXCLUDE: on a matching URL, DOMFortify stays completely out of the way - no policy, no meta. It
- // does NOT install a passthrough (that would be a silent XSS hole); under globally delivered
- // enforcement, excluded pages are the developer's responsibility. Reported via status.excluded.
- if (urlMatches(cfg(options, 'EXCLUDE'), url)) {
- status.excluded = true;
- return done('URL matched EXCLUDE; DOMFortify is intentionally inactive on this page.', 'excluded-by-url');
- }
- if (!TT || typeof TT.createPolicy !== 'function') {
- return done('Trusted Types not supported; library is inert. Sinks are NOT routed.', 'tt-unsupported');
- }
- // URL_CONFIG: the first rule whose `match` hits supplies per-URL overrides. `eff(key)` reads that
- // rule's own key when present, else falls back to the base config - both own-key only, so a polluted
- // prototype can neither inject a rule nor loosen a refusal.
- let override = null;
+ // --- config resolution (all own-key only, so a polluted prototype can't loosen anything) ---------
+ // First URL_CONFIG rule whose `match` hits, else null. Own-key reads only, so a polluted prototype
+ // can neither inject a rule nor reach one.
+ function selectOverride(options, url) {
const rules = cfg(options, 'URL_CONFIG');
- if (Array.isArray(rules)) {
- for (let i = 0; i < rules.length; i++) {
- const r = rules[i];
- if (r && urlMatches(r.match, url)) {
- override = r;
- break;
- }
+ if (!Array.isArray(rules))
+ return null;
+ for (let i = 0; i < rules.length; i++) {
+ const r = rules[i];
+ // Read `match` own-key only, so a polluted Object.prototype.match can't make a rule that lacks
+ // its own match apply to every URL.
+ if (r && typeof r === 'object' && urlMatches(cfg(r, 'match'), url)) {
+ return r;
}
}
- const eff = (key) => (override && own(override, key) ? override[key] : cfg(options, key));
- // INJECT_META (opt-in, best-effort - see injectMeta and the README). We only attempt it when TT is
- // supported; the directive lists the policies that will exist: our own `default`, plus `dompurify`
- // unless a bare-function sanitizer (e.g. the native Sanitizer API) is in use. META_DIRECTIVE overrides.
- if (cfg(options, 'INJECT_META') === true) {
- const md = cfg(options, 'META_DIRECTIVE');
- const ttNames = typeof eff('SANITIZER') === 'function' ? 'default' : 'default dompurify';
- const directive = typeof md === 'string' && md ? md : `require-trusted-types-for 'script'; trusted-types ${ttNames};`;
- status.metaInjected = injectMeta(directive);
- report('meta-injection-attempted', { directive, written: status.metaInjected });
- }
- status.enforcementActive = enforcementActive();
- // Resolve config once, reading own keys only so a polluted prototype can't supply a value - and,
- // most importantly, can't loosen a refusal. Nothing is re-read later, so runtime clobbering can't
- // retarget the policy either. URL_CONFIG overrides are applied here via `eff`.
- let rawSan = eff('SANITIZER');
- if (rawSan === undefined)
- rawSan = root.DOMPurify;
- // DOMPurify's export is itself a callable function (the factory) that also exposes `.sanitize`, so
- // check for a `.sanitize` method FIRST - otherwise we'd wrap the factory and call the wrong thing. A
- // bare function (e.g. a Sanitizer-API adapter) has no `.sanitize` and falls through to the function case.
- const DP = rawSan && typeof rawSan.sanitize === 'function'
- ? rawSan
- : typeof rawSan === 'function'
- ? { sanitize: rawSan }
- : null;
- const rawCfg = eff('SANITIZER_CONFIG');
- const sanitizeConfig = rawCfg && typeof rawCfg === 'object' ? shallowCopy(rawCfg) : undefined;
- // Sink openers count only if they're own functions, so prototype pollution can never open a sink.
- const asCand = eff('ALLOW_SCRIPT');
- const asuCand = eff('ALLOW_SCRIPT_URL');
- const allowScript = typeof asCand === 'function' ? asCand : null;
- const allowScriptURL = typeof asuCand === 'function' ? asuCand : null;
- // Smoke-test once so a broken sanitizer fails loudly here, not silently on the first real write. It
- // must return a string - a sanitizer that returns anything else would otherwise inject junk.
- let sanitizerReady = false;
- if (DP && typeof DP.sanitize === 'function') {
- try {
- sanitizerReady = typeof DP.sanitize('x ', sanitizeConfig) === 'string';
- if (!sanitizerReady)
- report('sanitizer-smoketest-failed', { error: 'sanitize() did not return a string' });
- }
- catch (e) {
- report('sanitizer-smoketest-failed', { error: emsg(e) });
+ return null;
+ }
+ // Does `raw` carry a `.sanitize` method of its own (or on its own class prototype), as opposed to one
+ // merely inherited from Object.prototype? We walk the chain but STOP before Object.prototype, so a
+ // polluted Object.prototype.sanitize is never mistaken for a real sanitizer. Class-based sanitizers,
+ // whose method lives on their own prototype below Object.prototype, still qualify. Tolerant of a
+ // hostile getter on the lookup path, which is treated as "not a sanitizer".
+ function looksLikeSanitizer(raw) {
+ try {
+ for (let o = raw; o && o !== Object.prototype; o = Object.getPrototypeOf(o)) {
+ if (own(o, 'sanitize'))
+ return typeof o.sanitize === 'function';
}
}
- status.sanitizerReady = sanitizerReady;
- // `reentry` is true only while the sanitizer parses our input internally - inert and synchronous - so
- // handing the raw string straight back is safe, and keeps us alive if its own sink re-enters us.
+ catch {
+ /* a throwing getter on the chain means we cannot trust it as a sanitizer */
+ }
+ return false;
+ }
+ // Normalize whatever the caller handed us into a sanitizer with a `.sanitize` method, or null.
+ // DOMPurify's export is itself a callable factory that ALSO carries `.sanitize`, so we must check for
+ // `.sanitize` FIRST - otherwise we'd wrap the factory and call the wrong thing. A bare function (e.g. a
+ // Sanitizer-API adapter) has no `.sanitize` and falls through to the function case.
+ function resolveSanitizer(raw) {
+ if (raw && looksLikeSanitizer(raw))
+ return raw;
+ if (typeof raw === 'function')
+ return { sanitize: raw };
+ return null;
+ }
+ // The trusted-types directive for INJECT_META. META_DIRECTIVE wins; otherwise we list the policies
+ // that will exist: our own `default`, plus `dompurify` unless a bare-function sanitizer is in use.
+ function metaDirective(md, functionSanitizer) {
+ if (typeof md === 'string' && md)
+ return md;
+ const ttNames = functionSanitizer ? 'default' : 'default dompurify';
+ return `require-trusted-types-for 'script'; trusted-types ${ttNames};`;
+ }
+ // Exercise the sanitizer once so a broken one fails loudly here, not silently on the first real write.
+ // It must return a string; anything else would inject junk into every sink.
+ function smokeTest(sanitizer, config) {
+ try {
+ const out = sanitizer.sanitize('x ', config);
+ return typeof out === 'string'
+ ? { ready: true, error: null }
+ : { ready: false, error: 'sanitize() did not return a string' };
+ }
+ catch (e) {
+ return { ready: false, error: emsg(e) };
+ }
+ }
+ // --- the default policy --------------------------------------------------------------------------
+ // createHTML: route through the sanitizer, fail closed on any problem. `reentry` is true only while
+ // the sanitizer parses our input internally (inert and synchronous), so handing the raw string back
+ // is safe and keeps us alive if the sanitizer's own sink re-enters us.
+ function makeSanitizeHTML(sanitizer, config, ready, report) {
let reentry = false;
- const sanitizeHTML = (s) => {
- if (!sanitizerReady) {
+ return (s) => {
+ if (!ready) {
report('sanitizer-unavailable', { sink: 'createHTML' });
return null; // fail closed
}
@@ -207,7 +217,7 @@
return s;
try {
reentry = true;
- return DP.sanitize(s, sanitizeConfig);
+ return sanitizer.sanitize(s, config);
}
catch (e) {
report('sanitize-threw', { error: emsg(e) });
@@ -217,9 +227,11 @@
reentry = false;
}
};
- // Code has no safe subset, so refuse by default. A caller hook may allow specific values; if it throws
- // or returns a non-string, we refuse.
- const scriptHook = (kind, fn) => (s) => {
+ }
+ // createScript / createScriptURL: code has no safe subset, so refuse by default. A caller hook may
+ // allow specific values; if it throws or returns a non-string, we refuse.
+ function makeScriptHook(kind, fn, report) {
+ return (s) => {
if (fn) {
let r;
try {
@@ -237,39 +249,141 @@
report('script-sink-refused', { sink: kind, sample: clip(s) });
return null;
};
- const policyDef = {
- createHTML: sanitizeHTML,
- createScript: scriptHook('createScript', allowScript),
- createScriptURL: scriptHook('createScriptURL', allowScriptURL),
+ }
+ // --- public entry point --------------------------------------------------------------------------
+ function init(options = {}) {
+ if (installed)
+ return cachedStatus;
+ installed = true;
+ // The violation reporter is observability, never control flow. Wrap it so a throwing ON_VIOLATION
+ // can neither abort init() (which would leave us installed with a null status) nor turn a
+ // fail-closed sink - one that should quietly return null - into a thrown exception.
+ const onv = cfg(options, 'ON_VIOLATION');
+ const report = typeof onv === 'function'
+ ? (code, detail) => {
+ try {
+ onv(code, detail);
+ }
+ catch {
+ /* a misbehaving reporter must never break the policy */
+ }
+ }
+ : () => { };
+ const status = {
+ version: VERSION,
+ ttSupported: !!TT,
+ enforcementActive: false,
+ defaultPolicyOwned: false,
+ sanitizerReady: false,
+ excluded: false,
+ metaInjected: false,
+ protected: false,
+ reason: '',
+ };
+ const done = (reason, code) => {
+ status.protected = status.defaultPolicyOwned && status.enforcementActive && status.sanitizerReady;
+ status.reason = reason;
+ // Freeze the snapshot first, then report it: the reporter sees exactly the authoritative status
+ // that gets cached and returned, and has no window to mutate the cached copy.
+ cachedStatus = Object.freeze({ ...status });
+ if (code)
+ report(code, cachedStatus);
+ return cachedStatus;
};
- // Did someone grab the default slot first? We can't evict them and won't vouch for them.
- if (TT.defaultPolicy) {
- return done('A default Trusted Types policy already exists; DOMFortify did NOT install and cannot vouch for it. ' +
- 'Load DOMFortify first, inline in .', 'preexisting-default-policy');
- }
- let ours;
try {
- ours = TT.createPolicy('default', policyDef);
+ const url = loc && typeof loc.href !== 'undefined' ? String(loc.href) : '';
+ // EXCLUDE: on a match, stay completely out of the way - no policy, no meta. We do NOT install a
+ // passthrough (that would be a silent XSS hole); under globally delivered enforcement, excluded
+ // pages are the developer's responsibility. Reported via status.excluded.
+ if (urlMatches(cfg(options, 'EXCLUDE'), url)) {
+ status.excluded = true;
+ return done('URL matched EXCLUDE; DOMFortify is intentionally inactive on this page.', 'excluded-by-url');
+ }
+ // INCLUDE: the allow-list complement of EXCLUDE. When set, activate ONLY on matching URLs and stay
+ // inactive (no policy, no meta) elsewhere. EXCLUDE is checked first, so it wins for URLs matching
+ // both. Like EXCLUDE, this only scopes activation safely when enforcement is page-scoped too.
+ const include = cfg(options, 'INCLUDE');
+ if (include != null && !urlMatches(include, url)) {
+ status.excluded = true;
+ return done('URL is outside INCLUDE scope; DOMFortify is intentionally inactive on this page.', 'outside-include-scope');
+ }
+ if (!TT || typeof TT.createPolicy !== 'function') {
+ return done('Trusted Types not supported; library is inert. Sinks are NOT routed.', 'tt-unsupported');
+ }
+ // Resolve config once. `eff(key)` reads the matching URL_CONFIG rule's own key when present, else the
+ // base config - both own-key only. Nothing is re-read later, so runtime clobbering can't retarget
+ // the policy after this point either.
+ const override = selectOverride(options, url);
+ const eff = (key) => (override && own(override, key) ? override[key] : cfg(options, key));
+ // INJECT_META (opt-in, best-effort - see injectMeta and the README).
+ if (cfg(options, 'INJECT_META') === true) {
+ const directive = metaDirective(cfg(options, 'META_DIRECTIVE'), typeof eff('SANITIZER') === 'function');
+ status.metaInjected = injectMeta(directive);
+ report('meta-injection-attempted', { directive, written: status.metaInjected });
+ }
+ status.enforcementActive = enforcementActive();
+ // Sanitizer: explicit SANITIZER (possibly per-URL), else window.DOMPurify. Config is forwarded
+ // verbatim as the second argument, copied to drop pollution-prone keys.
+ let rawSan = eff('SANITIZER');
+ if (rawSan === undefined)
+ rawSan = root.DOMPurify;
+ const sanitizer = resolveSanitizer(rawSan);
+ const rawCfg = eff('SANITIZER_CONFIG');
+ const sanitizeConfig = rawCfg && typeof rawCfg === 'object' ? shallowCopy(rawCfg) : undefined;
+ // Sink openers count only if they're own functions, so prototype pollution can never open a sink.
+ const asCand = eff('ALLOW_SCRIPT');
+ const asuCand = eff('ALLOW_SCRIPT_URL');
+ const allowScript = typeof asCand === 'function' ? asCand : null;
+ const allowScriptURL = typeof asuCand === 'function' ? asuCand : null;
+ let sanitizerReady = false;
+ if (sanitizer) {
+ const result = smokeTest(sanitizer, sanitizeConfig);
+ sanitizerReady = result.ready;
+ if (!result.ready)
+ report('sanitizer-smoketest-failed', { error: result.error });
+ }
+ status.sanitizerReady = sanitizerReady;
+ // createHTML closes over sanitizeConfig; the script hooks refuse unless an own-function hook allows.
+ const policyDef = {
+ createHTML: makeSanitizeHTML(sanitizer, sanitizeConfig, sanitizerReady, report),
+ createScript: makeScriptHook('createScript', allowScript, report),
+ createScriptURL: makeScriptHook('createScriptURL', allowScriptURL, report),
+ };
+ // Did someone grab the default slot first? We can't evict them and won't vouch for them.
+ if (TT.defaultPolicy) {
+ return done('A default Trusted Types policy already exists; DOMFortify did NOT install and cannot vouch for it. ' +
+ 'Load DOMFortify first, inline in .', 'preexisting-default-policy');
+ }
+ let ours;
+ try {
+ ours = TT.createPolicy('default', policyDef);
+ }
+ catch (e) {
+ // Throws when a default policy exists and 'allow-duplicates' is off - someone won the race.
+ return done(`createPolicy("default") threw (${emsg(e)}); another default policy won the race.`, 'default-policy-lost');
+ }
+ // With 'allow-duplicates' the create can succeed yet not be the active default.
+ if (TT.defaultPolicy && TT.defaultPolicy !== ours) {
+ return done('Our policy was created but is not the active default (allow-duplicates race lost). ' +
+ 'Remove "allow-duplicates" from the trusted-types directive.', 'default-policy-not-active');
+ }
+ status.defaultPolicyOwned = true;
+ if (!status.enforcementActive) {
+ return done('Default policy installed and slot locked, but TT enforcement is NOT active - sinks are not routed. ' +
+ 'Deliver require-trusted-types-for (header preferred).', 'enforcement-inactive');
+ }
+ if (!sanitizerReady) {
+ return done('Enforcement active and slot locked, but the sanitizer is unavailable - HTML sinks will THROW ' +
+ '(failing closed). Bundle DOMPurify and load it before DOMFortify.', 'failing-closed');
+ }
+ return done(`Active: HTML sinks sanitized, script sinks ${allowScript || allowScriptURL ? 'partly allowed by hooks' : 'refused'}.`);
}
catch (e) {
- // Throws when a default policy exists and 'allow-duplicates' is off - someone won the race.
- return done(`createPolicy("default") threw (${emsg(e)}); another default policy won the race.`, 'default-policy-lost');
- }
- // With 'allow-duplicates' the create can succeed yet not be the active default.
- if (TT.defaultPolicy && TT.defaultPolicy !== ours) {
- return done('Our policy was created but is not the active default (allow-duplicates race lost). ' +
- 'Remove "allow-duplicates" from the trusted-types directive.', 'default-policy-not-active');
- }
- status.defaultPolicyOwned = true;
- if (!status.enforcementActive) {
- return done('Default policy installed and slot locked, but TT enforcement is NOT active - sinks are not routed. ' +
- 'Deliver require-trusted-types-for (header preferred).', 'enforcement-inactive');
- }
- if (!sanitizerReady) {
- return done('Enforcement active and slot locked, but the sanitizer is unavailable - HTML sinks will THROW ' +
- '(failing closed). Bundle DOMPurify and load it before DOMFortify.', 'failing-closed');
+ // Defense in depth: init() must never throw or leave the library bricked with a null status. A
+ // hostile getter or exotic environment that slips past the guards above fails closed here, with a
+ // real status object still cached and returned.
+ return done(`init() hit an unexpected error (${emsg(e)}); failing closed.`, 'failing-closed');
}
- return done(`Active: HTML sinks sanitized, script sinks ${allowScript || allowScriptURL ? 'partly allowed by hooks' : 'refused'}.`);
}
function status() {
return cachedStatus;
diff --git a/dist/fortify.js.map b/dist/fortify.js.map
index 8f9f552..c13415f 100644
--- a/dist/fortify.js.map
+++ b/dist/fortify.js.map
@@ -1 +1 @@
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\ No newline at end of file
diff --git a/dist/fortify.min.js b/dist/fortify.min.js
index 4cba428..e8800b8 100644
--- a/dist/fortify.min.js
+++ b/dist/fortify.min.js
@@ -1,3 +1,3 @@
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diff --git a/dist/fortify.min.js.map b/dist/fortify.min.js.map
index 8f47d04..1d4e1e7 100644
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+{"version":3,"file":"fortify.min.js","sources":["../src/internal.ts","../src/fortify.ts","../src/auto.ts"],"sourcesContent":[null,null,null],"names":["hasOwn","Object","prototype","hasOwnProperty","own","obj","key","call","cfg","undefined","clip","s","String","slice","emsg","e","message","urlMatches","pattern","url","list","Array","isArray","i","length","p","indexOf","RegExp","test","root","globalThis","window","doc","document","loc","location","TT","trustedTypes","installed","cachedStatus","resolveSanitizer","raw","o","getPrototypeOf","sanitize","looksLikeSanitizer","makeSanitizeHTML","sanitizer","config","ready","report","reentry","sink","error","makeScriptHook","kind","fn","r","sample","DOMFortify","freeze","init","options","onv","code","detail","status","version","ttSupported","enforcementActive","defaultPolicyOwned","sanitizerReady","excluded","metaInjected","protected","reason","done","href","include","createPolicy","override","rules","selectOverride","eff","directive","md","functionSanitizer","content","d","tag","replace","readyState","write","m","createElement","setAttribute","head","documentElement","appendChild","injectMeta","written","innerHTML","rawSan","DOMPurify","rawCfg","sanitizeConfig","out","k","shallowCopy","asCand","asuCand","allowScript","allowScriptURL","result","smokeTest","policyDef","createHTML","createScript","createScriptURL","defaultPolicy","ours","DOMFortifyConfig"],"mappings":";yBAQA,MAAMA,EAASC,OAAOC,UAAUC,eAG1B,SAAUC,EAAIC,EAAcC,GAChC,OAAc,MAAPD,GAAeL,EAAOO,KAAKF,EAAKC,EACzC,CAGM,SAAUE,EAAIH,EAAcC,GAChC,OAAOF,EAAIC,EAAKC,GAAQD,EAAgCC,QAAOG,CACjE,CAGM,SAAUC,EAAKC,GACnB,OAAOC,OAAOD,GAAGE,MAAM,EAAG,GAC5B,CAOM,SAAUC,EAAKC,GACnB,IACE,OAAOH,OAAQG,GAAyCC,QAC1D,CAAE,MACA,MAAO,eACT,CACF,CAqBM,SAAUC,EAAWC,EAAgDC,GACzE,GAAe,MAAXD,EAAiB,OAAO,EAC5B,MAAME,EAAOC,MAAMC,QAAQJ,GAAWA,EAAU,CAACA,GACjD,IAAK,IAAIK,EAAI,EAAGA,EAAIH,EAAKI,OAAQD,IAAK,CACpC,MAAME,EAAIL,EAAKG,GACf,GAAiB,iBAANE,GACT,GAAU,KAANA,IAA+B,IAAnBN,EAAIO,QAAQD,GAAW,OAAO,OACzC,GAAIA,aAAaE,OACtB,IACE,GAAIF,EAAEG,KAAKT,GAAM,OAAO,CAC1B,CAAE,MAEF,CAEJ,CACA,OAAO,CACT,CClDA,MAUMU,EACkB,oBAAfC,WAA6BA,WAAcC,OAC9CC,EAAgD,oBAAbC,SAA2BA,cAAWxB,EACzEyB,EAAuCL,EAAsDM,SAC7FC,EAAMP,EAAiDQ,aAE7D,IAAIC,GAAY,EACZC,EAAkD,KAsFtD,SAASC,EAAiBC,GACxB,OAAIA,GAhBN,SAA4BA,GAC1B,IACE,IAAK,IAAIC,EAAaD,EAAKC,GAAKA,IAAMzC,OAAOC,UAAWwC,EAAIzC,OAAO0C,eAAeD,GAChF,GAAItC,EAAIsC,EAAG,YAAa,MAAyD,mBAA1CA,EAA6BE,QAExE,CAAE,MAEF,CACA,OAAO,CACT,CAOaC,CAAmBJ,GAAaA,EACxB,mBAARA,EAA2B,CAAEG,SAAUH,GAC3C,IACT,CA4BA,SAASK,EACPC,EACAC,EACAC,EACAC,GAEA,IAAIC,GAAU,EACd,OAAQxC,IACN,IAAKsC,EAEH,OADAC,EAAO,wBAAyB,CAAEE,KAAM,eACjC,KAET,GAAID,EAAS,OAAOxC,EACpB,IAEE,OADAwC,GAAU,EACFJ,EAAwBH,SAASjC,EAAGqC,EAC9C,CAAE,MAAOjC,GAEP,OADAmC,EAAO,iBAAkB,CAAEG,MAAOvC,EAAKC,KAChC,IACT,SACEoC,GAAU,CACZ,EAEJ,CAIA,SAASG,EACPC,EACAC,EACAN,GAEA,OAAQvC,IACN,GAAI6C,EAAI,CACN,IAAIC,EACJ,IACEA,EAAID,EAAG7C,EACT,CAAE,MAAOI,GAEP,OADAmC,EAAO,oBAAqB,CAAEE,KAAMG,EAAMF,MAAOvC,EAAKC,KAC/C,IACT,CACA,GAAiB,iBAAN0C,EAET,OADAP,EAAO,sBAAuB,CAAEE,KAAMG,IAC/BE,CAEX,CAEA,OADAP,EAAO,sBAAuB,CAAEE,KAAMG,EAAMG,OAAQhD,EAAKC,KAClD,KAEX,CAgLO,MAAMgD,EAA4B1D,OAAO2D,OAAO,CAAEC,KA5KnD,SAAeC,EAA4B,IAC/C,GAAIxB,EAAW,OAAOC,EACtBD,GAAY,EAKZ,MAAMyB,EAAMvD,EAAIsD,EAAS,gBACnBZ,EACW,mBAARa,EACH,CAACC,EAAMC,KACL,IACGF,EAAeC,EAAMC,EACxB,CAAE,MAEF,GAEF,OAEAC,EAA2B,CAC/BC,QAhNY,QAiNZC,cAAehC,EACfiC,mBAAmB,EACnBC,oBAAoB,EACpBC,gBAAgB,EAChBC,UAAU,EACVC,cAAc,EACdC,WAAW,EACXC,OAAQ,IAEJC,EAAO,CAACD,EAAgBX,KAC5BE,EAAOQ,UAAYR,EAAOI,oBAAsBJ,EAAOG,mBAAqBH,EAAOK,eACnFL,EAAOS,OAASA,EAGhBpC,EAAetC,OAAO2D,OAAO,IAAKM,IAC9BF,GAAMd,EAAOc,EAAMzB,GAChBA,GAGT,IACE,MAAMpB,EAAMe,QAA2B,IAAbA,EAAI2C,KAAuBjE,OAAOsB,EAAI2C,MAAQ,GAKxE,GAAI5D,EAAWT,EAAIsD,EAAS,WAAqD3C,GAE/E,OADA+C,EAAOM,UAAW,EACXI,EAAK,0EAA2E,mBAMzF,MAAME,EAAUtE,EAAIsD,EAAS,WAC7B,GAAe,MAAXgB,IAAoB7D,EAAW6D,EAAS3D,GAE1C,OADA+C,EAAOM,UAAW,EACXI,EACL,mFACA,yBAIJ,IAAKxC,GAAiC,mBAApBA,EAAG2C,aACnB,OAAOH,EAAK,uEAAwE,kBAMtF,MAAMI,EA7LV,SAAwBlB,EAA2B3C,GACjD,MAAM8D,EAAQzE,EAAIsD,EAAS,cAC3B,IAAKzC,MAAMC,QAAQ2D,GAAQ,OAAO,KAClC,IAAK,IAAI1D,EAAI,EAAGA,EAAI0D,EAAMzD,OAAQD,IAAK,CACrC,MAAMkC,EAAIwB,EAAM1D,GAGhB,GAAIkC,GAAkB,iBAANA,GAAkBxC,EAAWT,EAAIiD,EAAG,SAAmDtC,GACrG,OAAOsC,CAEX,CACA,OAAO,IACT,CAiLqByB,CAAepB,EAAS3C,GACnCgE,EAAO7E,GAA0B0E,GAAY5E,EAAI4E,EAAU1E,GAAO0E,EAAS1E,GAAOE,EAAIsD,EAASxD,GAGrG,IAAoC,IAAhCE,EAAIsD,EAAS,eAAyB,CACxC,MAAMsB,GAxJWC,EAwJe7E,EAAIsD,EAAS,kBAxJfwB,EAwJ8D,mBAArBH,EAAI,aAvJ7D,iBAAPE,GAAmBA,EAAWA,EAElC,qDADSC,EAAoB,UAAY,wBAuJ5CpB,EAAOO,aA/Nb,SAAoBc,GAClB,IAAKvD,EAAK,OAAO,EACjB,MAAMwD,EAAIxD,EAEJyD,EAAM,uDADCF,EAAQG,QAAQ,aAAc,IACiC,KAC5E,GAAqB,YAAjBF,EAAEG,YAA+C,mBAAZH,EAAEI,MACzC,IAEE,OADAJ,EAAEI,MAAMH,IACD,CACT,CAAE,MAEF,CAEF,IACE,MAAMI,EAAIL,EAAEM,cAAc,QAC1BD,EAAEE,aAAa,aAAc,2BAC7BF,EAAEE,aAAa,UAAWR,IACzBC,EAAEQ,MAAQR,EAAES,iBAAiBC,YAAYL,EAC5C,CAAE,MAEF,CACA,OAAO,CACT,CAyM4BM,CAAWf,GACjClC,EAAO,2BAA4B,CAAEkC,YAAWgB,QAASlC,EAAOO,cAClE,CAEAP,EAAOG,kBArPX,WACE,IAEE,OADCrC,EAAiB8D,cAAc,OAAOO,UAAY,KAC5C,CACT,CAAE,MACA,OAAO,CACT,CACF,CA8O+BhC,GAI3B,IAAIiC,EAAkBnB,EAAI,kBACX1E,IAAX6F,IAA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\ No newline at end of file
diff --git a/osv-scanner.toml b/osv-scanner.toml
index 95fe250..8278c74 100644
--- a/osv-scanner.toml
+++ b/osv-scanner.toml
@@ -4,12 +4,83 @@
# supply-chain surface of its own. Any advisories OSV-Scanner reports come from
# development / test / CI tooling in the lockfile, never from distributed code.
#
-# There are no suppressions yet. If a dev-only advisory ever needs ignoring, add
-# an [[IgnoredVulns]] entry with a VERIFIED GHSA id, a reason, and a one-year
-# ignoreUntil horizon so it is re-evaluated rather than suppressed forever.
+# Most suppressions below are for deliberately-vulnerable legacy libraries
+# pulled in ONLY as e2e test fixtures (test/fixtures/with-angularjs.html and
+# test/fixtures/with-jquery.html). They are intentionally old: the tests exist
+# to prove DOMFortify backstops their known DOM-XSS sinks, so "upgrade to fix"
+# is not an option - a patched version would no longer exercise the footgun.
+# devDependencies only; never part of the published runtime artifact.
#
-# Example (commented out):
-# [[IgnoredVulns]]
-# id = "GHSA-xxxx-xxxx-xxxx"
-# ignoreUntil = 2027-06-15
-# reason = "Dev tooling only; not part of the published runtime artifact."
+# Each entry carries a one-year ignoreUntil so it is re-evaluated, not buried.
+
+# --- AngularJS 1.8.3 (EOL, terminal - no fixed 1.x release exists) -----------
+# Fixture: test/fixtures/with-angularjs.html (ng-bind-html without ngSanitize).
+[[IgnoredVulns]]
+id = "GHSA-2qqx-w9hr-q5gx"
+ignoreUntil = 2027-06-22
+reason = "AngularJS 1.8.3 EOL; dev-only test fixture, not in the published runtime artifact."
+
+[[IgnoredVulns]]
+id = "GHSA-2vrf-hf26-jrp5"
+ignoreUntil = 2027-06-22
+reason = "AngularJS 1.8.3 EOL; dev-only test fixture, not in the published runtime artifact."
+
+[[IgnoredVulns]]
+id = "GHSA-4w4v-5hc9-xrr2"
+ignoreUntil = 2027-06-22
+reason = "AngularJS 1.8.3 EOL; dev-only test fixture, not in the published runtime artifact."
+
+[[IgnoredVulns]]
+id = "GHSA-j58c-ww9w-pwp5"
+ignoreUntil = 2027-06-22
+reason = "AngularJS 1.8.3 EOL; dev-only test fixture, not in the published runtime artifact."
+
+[[IgnoredVulns]]
+id = "GHSA-m2h2-264f-f486"
+ignoreUntil = 2027-06-22
+reason = "AngularJS 1.8.3 EOL; dev-only test fixture, not in the published runtime artifact."
+
+[[IgnoredVulns]]
+id = "GHSA-m9gf-397r-hwpg"
+ignoreUntil = 2027-06-22
+reason = "AngularJS 1.8.3 EOL; dev-only test fixture, not in the published runtime artifact."
+
+[[IgnoredVulns]]
+id = "GHSA-mqm9-c95h-x2p6"
+ignoreUntil = 2027-06-22
+reason = "AngularJS 1.8.3 EOL; dev-only test fixture, not in the published runtime artifact."
+
+[[IgnoredVulns]]
+id = "GHSA-prc3-vjfx-vhm9"
+ignoreUntil = 2027-06-22
+reason = "AngularJS 1.8.3 EOL; dev-only test fixture, not in the published runtime artifact."
+
+[[IgnoredVulns]]
+id = "GHSA-qwqh-hm9m-p5hr"
+ignoreUntil = 2027-06-22
+reason = "AngularJS 1.8.3 EOL; dev-only test fixture, not in the published runtime artifact."
+
+# --- jQuery 3.4.1 (deliberately pre-3.5: CVE-2020-11022 / -11023 mXSS) -------
+# Fixture: test/fixtures/with-jquery.html ($(t).html() reaching innerHTML).
+# Bumping to >= 3.5.0 would patch the very sink the test relies on.
+[[IgnoredVulns]]
+id = "GHSA-gxr4-xjj5-5px2"
+ignoreUntil = 2027-06-22
+reason = "jQuery 3.4.1 pinned pre-3.5 on purpose for the mXSS backstop test; dev-only, not shipped."
+
+[[IgnoredVulns]]
+id = "GHSA-jpcq-cgw6-v4j6"
+ignoreUntil = 2027-06-22
+reason = "jQuery 3.4.1 pinned pre-3.5 on purpose for the mXSS backstop test; dev-only, not shipped."
+
+# --- js-yaml 3.14.2 (transitive, via nyc coverage tooling) ------------------
+# Path: nyc -> @istanbuljs/load-nyc-config -> js-yaml@3.14.2. Not a fixture and
+# not deliberately old - just what nyc pins. dev-only (npm audit --omit=dev is
+# clean); never in the published zero-dependency runtime artifact. Cannot be
+# forward-fixed here: the patched js-yaml is >= 4.2.0, but load-nyc-config calls
+# the 3.x safeLoad API that 4.x removed, so an override breaks coverage. The DoS
+# also requires parsing attacker-controlled YAML; nyc only reads our own .nycrc.
+[[IgnoredVulns]]
+id = "GHSA-h67p-54hq-rp68"
+ignoreUntil = 2027-06-22
+reason = "js-yaml 3.14.2 via nyc coverage tooling; dev-only, not shipped, no forward fix (4.x drops the safeLoad API nyc uses)."
diff --git a/package-lock.json b/package-lock.json
index 71b41ac..0e7c32e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,25 +1,29 @@
{
"name": "domfortify",
- "version": "0.1.0",
+ "version": "0.5.0",
"lockfileVersion": 3,
"requires": true,
"packages": {
"": {
"name": "domfortify",
- "version": "0.1.0",
+ "version": "0.5.0",
"license": "(MPL-2.0 OR Apache-2.0)",
"devDependencies": {
"@playwright/test": "^1.49.0",
"@rollup/plugin-replace": "^6.0.1",
"@rollup/plugin-terser": "^1.0.0",
"@rollup/plugin-typescript": "^12.1.1",
- "dompurify": "^3.2.0",
+ "angular": "1.8.3",
+ "dompurify": "^3.4.11",
"fast-check": "^4.8.0",
+ "jquery": "3.4.1",
+ "nyc": "^18.0.0",
"prettier": "^3.4.2",
"qunit": "^2.23.1",
"rimraf": "^6.0.1",
"rollup": "^4.28.1",
"rollup-plugin-dts": "^6.1.1",
+ "rollup-plugin-istanbul": "^5.0.0",
"tslib": "^2.8.1",
"typescript": "^5.7.2"
},
@@ -33,7 +37,6 @@
"integrity": "sha512-Aup7aUOfpbAUg2ROOJN6Iw5f9DMBlzu0mIkm/malLQFN/YQgO48wCj0Kxa3sEHJvPVFg7siR+qRInwXd2qhQKw==",
"dev": true,
"license": "MIT",
- "optional": true,
"dependencies": {
"@babel/helper-validator-identifier": "^7.29.7",
"js-tokens": "^4.0.0",
@@ -43,17 +46,288 @@
"node": ">=6.9.0"
}
},
+ "node_modules/@babel/compat-data": {
+ "version": "7.29.7",
+ "resolved": "https://registry.npmjs.org/@babel/compat-data/-/compat-data-7.29.7.tgz",
+ "integrity": "sha512-locTkQyKvwIEgBzVrn8693ebc97F2U8ZHjbXwDXJ5Fn2TCpNwTlKcaKLkdHop5c/icOFE7qt7Q9JC5hnKNa6Gg==",
+ "dev": true,
+ "license": "MIT",
+ "engines": {
+ "node": ">=6.9.0"
+ }
+ },
+ "node_modules/@babel/core": {
+ "version": "7.29.7",
+ "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.29.7.tgz",
+ "integrity": "sha512-RgHBCvtjbOK2gXSNBNIkNoEc9qoVEtau3hj8gEqKQuL3HZAibKarWFEI3Lfm6EYKkLalOh8eSrj9b+ch9H/VBA==",
+ "dev": true,
+ "license": "MIT",
+ "dependencies": {
+ "@babel/code-frame": "^7.29.7",
+ "@babel/generator": "^7.29.7",
+ "@babel/helper-compilation-targets": "^7.29.7",
+ "@babel/helper-module-transforms": "^7.29.7",
+ "@babel/helpers": "^7.29.7",
+ "@babel/parser": "^7.29.7",
+ "@babel/template": "^7.29.7",
+ "@babel/traverse": "^7.29.7",
+ "@babel/types": "^7.29.7",
+ "@jridgewell/remapping": "^2.3.5",
+ "convert-source-map": "^2.0.0",
+ "debug": "^4.1.0",
+ "gensync": "^1.0.0-beta.2",
+ "json5": "^2.2.3",
+ "semver": "^6.3.1"
+ },
+ "engines": {
+ "node": ">=6.9.0"
+ },
+ "funding": {
+ "type": "opencollective",
+ "url": "https://opencollective.com/babel"
+ }
+ },
+ "node_modules/@babel/core/node_modules/semver": {
+ "version": "6.3.1",
+ "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
+ "integrity": "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==",
+ "dev": true,
+ "license": "ISC",
+ "bin": {
+ "semver": "bin/semver.js"
+ }
+ },
+ "node_modules/@babel/generator": {
+ "version": "7.29.7",
+ "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.29.7.tgz",
+ "integrity": "sha512-DkXD5OJQaAQIdZ1bt3UZdEnHAn9Imd3IVBdX03UFe+ony9Ojw5pzr9YVKGDY1jt+Gcn/FnGkNf8r+Vj5NOJWtQ==",
+ "dev": true,
+ "license": "MIT",
+ "dependencies": {
+ "@babel/parser": "^7.29.7",
+ "@babel/types": "^7.29.7",
+ "@jridgewell/gen-mapping": "^0.3.12",
+ "@jridgewell/trace-mapping": "^0.3.28",
+ "jsesc": "^3.0.2"
+ },
+ "engines": {
+ "node": ">=6.9.0"
+ }
+ },
+ "node_modules/@babel/helper-compilation-targets": {
+ "version": "7.29.7",
+ "resolved": "https://registry.npmjs.org/@babel/helper-compilation-targets/-/helper-compilation-targets-7.29.7.tgz",
+ "integrity": "sha512-wem6WaBj4NaVYVdNhLPPVacES6ZJ+KBBfSkTMD3YZxbP3rm3Di85tJU5ljaUNhaOynt+Aj0xruhYuzQBt8n71g==",
+ "dev": true,
+ "license": "MIT",
+ "dependencies": {
+ "@babel/compat-data": "^7.29.7",
+ "@babel/helper-validator-option": "^7.29.7",
+ "browserslist": "^4.24.0",
+ "lru-cache": "^5.1.1",
+ "semver": "^6.3.1"
+ },
+ "engines": {
+ "node": ">=6.9.0"
+ }
+ },
+ "node_modules/@babel/helper-compilation-targets/node_modules/lru-cache": {
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+ "dev": true,
+ "license": "MIT",
+ "engines": {
+ "node": ">=8"
+ }
+ },
"node_modules/path-parse": {
"version": "1.0.7",
"resolved": "https://registry.npmjs.org/path-parse/-/path-parse-1.0.7.tgz",
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"dev": true,
- "license": "ISC",
- "optional": true
+ "license": "ISC"
},
"node_modules/picomatch": {
"version": "4.0.4",
@@ -903,6 +2099,19 @@
"url": "https://github.com/sponsors/jonschlinkert"
}
},
+ "node_modules/pkg-dir": {
+ "version": "4.2.0",
+ "resolved": "https://registry.npmjs.org/pkg-dir/-/pkg-dir-4.2.0.tgz",
+ "integrity": "sha512-HRDzbaKjC+AOWVXxAU/x54COGeIv9eb+6CkDSQoNTt4XyWoIJvuPsXizxu/Fr23EiekbtZwmh1IcIG/l/a10GQ==",
+ "dev": true,
+ "license": "MIT",
+ "dependencies": {
+ "find-up": "^4.0.0"
+ },
+ "engines": {
+ "node": ">=8"
+ }
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"node_modules/playwright": {
"version": "1.61.0",
"resolved": "https://registry.npmjs.org/playwright/-/playwright-1.61.0.tgz",
@@ -951,6 +2160,19 @@
"url": "https://github.com/prettier/prettier?sponsor=1"
}
},
+ "node_modules/process-on-spawn": {
+ "version": "1.1.0",
+ "resolved": "https://registry.npmjs.org/process-on-spawn/-/process-on-spawn-1.1.0.tgz",
+ "integrity": "sha512-JOnOPQ/8TZgjs1JIH/m9ni7FfimjNa/PRx7y/Wb5qdItsnhO0jE4AT7fC0HjC28DUQWDr50dwSYZLdRMlqDq3Q==",
+ "dev": true,
+ "license": "MIT",
+ "dependencies": {
+ "fromentries": "^1.2.0"
+ },
+ "engines": {
+ "node": ">=8"
+ }
+ },
"node_modules/pure-rand": {
"version": "8.4.0",
"resolved": "https://registry.npmjs.org/pure-rand/-/pure-rand-8.4.0.tgz",
@@ -986,6 +2208,36 @@
"node": ">=10"
}
},
+ "node_modules/release-zalgo": {
+ "version": "1.0.0",
+ "resolved": "https://registry.npmjs.org/release-zalgo/-/release-zalgo-1.0.0.tgz",
+ "integrity": "sha512-gUAyHVHPPC5wdqX/LG4LWtRYtgjxyX78oanFNTMMyFEfOqdC54s3eE82imuWKbOeqYht2CrNf64Qb8vgmmtZGA==",
+ "dev": true,
+ "license": "ISC",
+ "dependencies": {
+ "es6-error": "^4.0.1"
+ },
+ "engines": {
+ "node": ">=4"
+ }
+ },
+ "node_modules/require-directory": {
+ "version": "2.1.1",
+ "resolved": "https://registry.npmjs.org/require-directory/-/require-directory-2.1.1.tgz",
+ "integrity": "sha512-fGxEI7+wsG9xrvdjsrlmL22OMTTiHRwAMroiEeMgq8gzoLC/PQr7RsRDSTLUg/bZAZtF+TVIkHc6/4RIKrui+Q==",
+ "dev": true,
+ "license": "MIT",
+ "engines": {
+ "node": ">=0.10.0"
+ }
+ },
+ "node_modules/require-main-filename": {
+ "version": "2.0.0",
+ "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-2.0.0.tgz",
+ "integrity": "sha512-NKN5kMDylKuldxYLSUfrbo5Tuzh4hd+2E8NPPX02mZtn1VuREQToYe/ZdlJy+J3uCpfaiGF05e7B8W0iXbQHmg==",
+ "dev": true,
+ "license": "ISC"
+ },
"node_modules/resolve": {
"version": "1.22.12",
"resolved": "https://registry.npmjs.org/resolve/-/resolve-1.22.12.tgz",
@@ -1008,6 +2260,16 @@
"url": "https://github.com/sponsors/ljharb"
}
},
+ "node_modules/resolve-from": {
+ "version": "5.0.0",
+ "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-5.0.0.tgz",
+ "integrity": "sha512-qYg9KP24dD5qka9J47d0aVky0N+b4fTU89LN9iDnjB5waksiC49rvMB0PrUJQGoTmH50XPiqOvAjDfaijGxYZw==",
+ "dev": true,
+ "license": "MIT",
+ "engines": {
+ "node": ">=8"
+ }
+ },
"node_modules/rimraf": {
"version": "6.1.3",
"resolved": "https://registry.npmjs.org/rimraf/-/rimraf-6.1.3.tgz",
@@ -1099,6 +2361,38 @@
"typescript": "^4.5 || ^5.0 || ^6.0"
}
},
+ "node_modules/rollup-plugin-istanbul": {
+ "version": "5.0.0",
+ "resolved": "https://registry.npmjs.org/rollup-plugin-istanbul/-/rollup-plugin-istanbul-5.0.0.tgz",
+ "integrity": "sha512-5FMw55B/05AVfEM75yqlzcIBFCMzS4bKDF8mA1pq2XNzYcGUd6BElZM6wvc9sn2uAclTYn6pK+kt4R4JoHmNHA==",
+ "dev": true,
+ "license": "MIT",
+ "dependencies": {
+ "@rollup/pluginutils": "^5.0.5",
+ "istanbul-lib-instrument": "^6.0.1"
+ },
+ "peerDependencies": {
+ "rollup": "^1.20.0||^2.0.0||^3.0.0||^4.0.0"
+ },
+ "peerDependenciesMeta": {
+ "rollup": {
+ "optional": true
+ }
+ }
+ },
+ "node_modules/semver": {
+ "version": "7.8.5",
+ "resolved": "https://registry.npmjs.org/semver/-/semver-7.8.5.tgz",
+ "integrity": "sha512-Y7/KDsb8LjooZpwaqGyulO6DQlksgCncchHGk+sZIY4SBvUocMBEFH5Ur1fI4dV+Jvl0w6cjvucaIi40puRioA==",
+ "dev": true,
+ "license": "ISC",
+ "bin": {
+ "semver": "bin/semver.js"
+ },
+ "engines": {
+ "node": ">=10"
+ }
+ },
"node_modules/serialize-javascript": {
"version": "7.0.5",
"resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-7.0.5.tgz",
@@ -1109,6 +2403,43 @@
"node": ">=20.0.0"
}
},
+ "node_modules/set-blocking": {
+ "version": "2.0.0",
+ "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
+ "integrity": "sha512-KiKBS8AnWGEyLzofFfmvKwpdPzqiy16LvQfK3yv/fVH7Bj13/wl3JSR1J+rfgRE9q7xUJK4qvgS8raSOeLUehw==",
+ "dev": true,
+ "license": "ISC"
+ },
+ "node_modules/shebang-command": {
+ "version": "2.0.0",
+ "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
+ "integrity": "sha512-kHxr2zZpYtdmrN1qDjrrX/Z1rR1kG8Dx+gkpK1G4eXmvXswmcE1hTWBWYUzlraYw1/yZp6YuDY77YtvbN0dmDA==",
+ "dev": true,
+ "license": "MIT",
+ "dependencies": {
+ "shebang-regex": "^3.0.0"
+ },
+ "engines": {
+ "node": ">=8"
+ }
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+ "node_modules/shebang-regex": {
+ "version": "3.0.0",
+ "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-3.0.0.tgz",
+ "integrity": "sha512-7++dFhtcx3353uBaq8DDR4NuxBetBzC7ZQOhmTQInHEd6bSrXdiEyzCvG07Z44UYdLShWUyXt5M/yhz8ekcb1A==",
+ "dev": true,
+ "license": "MIT",
+ "engines": {
+ "node": ">=8"
+ }
+ },
+ "node_modules/signal-exit": {
+ "version": "3.0.7",
+ "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.7.tgz",
+ "integrity": "sha512-wnD2ZE+l+SPC/uoS0vXeE9L1+0wuaMqKlfz9AMUo38JsyLSBWSFcHR1Rri62LZc12vLr1gb3jl7iwQhgwpAbGQ==",
+ "dev": true,
+ "license": "ISC"
+ },
"node_modules/smob": {
"version": "1.6.2",
"resolved": "https://registry.npmjs.org/smob/-/smob-1.6.2.tgz",
@@ -1140,6 +2471,97 @@
"source-map": "^0.6.0"
}
},
+ "node_modules/spawn-wrap": {
+ "version": "3.0.0",
+ "resolved": "https://registry.npmjs.org/spawn-wrap/-/spawn-wrap-3.0.0.tgz",
+ "integrity": "sha512-z+s5vv4KzFPJVddGab0xX2n7kQPGMdNUX5l9T8EJqsXdKTWpcxmAqWHpsgHEXoC1taGBCc7b79bi62M5kdbrxQ==",
+ "dev": true,
+ "license": "BlueOak-1.0.0",
+ "dependencies": {
+ "cross-spawn": "^7.0.6",
+ "foreground-child": "^2.0.0",
+ "is-windows": "^1.0.2",
+ "make-dir": "^3.0.0",
+ "rimraf": "^6.1.3",
+ "signal-exit": "^3.0.2",
+ "which": "^2.0.1"
+ },
+ "engines": {
+ "node": ">=8"
+ }
+ },
+ "node_modules/spawn-wrap/node_modules/foreground-child": {
+ "version": "2.0.0",
+ "resolved": "https://registry.npmjs.org/foreground-child/-/foreground-child-2.0.0.tgz",
+ "integrity": "sha512-dCIq9FpEcyQyXKCkyzmlPTFNgrCzPudOe+mhvJU5zAtlBnGVy2yKxtfsxK2tQBThwq225jcvBjpw1Gr40uzZCA==",
+ "dev": true,
+ "license": "ISC",
+ "dependencies": {
+ "cross-spawn": "^7.0.0",
+ "signal-exit": "^3.0.2"
+ },
+ "engines": {
+ "node": ">=8.0.0"
+ }
+ },
+ "node_modules/sprintf-js": {
+ "version": "1.0.3",
+ "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
+ "integrity": "sha512-D9cPgkvLlV3t3IzL0D0YLvGA9Ahk4PcvVwUbN0dSGr1aP0Nrt4AEnTUbuGvquEC0mA64Gqt1fzirlRs5ibXx8g==",
+ "dev": true,
+ "license": "BSD-3-Clause"
+ },
+ "node_modules/string-width": {
+ "version": "4.2.3",
+ "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+ "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+ "dev": true,
+ "license": "MIT",
+ "dependencies": {
+ "emoji-regex": "^8.0.0",
+ "is-fullwidth-code-point": "^3.0.0",
+ "strip-ansi": "^6.0.1"
+ },
+ "engines": {
+ "node": ">=8"
+ }
+ },
+ "node_modules/strip-ansi": {
+ "version": "6.0.1",
+ "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+ "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+ "dev": true,
+ "license": "MIT",
+ "dependencies": {
+ "ansi-regex": "^5.0.1"
+ },
+ "engines": {
+ "node": ">=8"
+ }
+ },
+ "node_modules/strip-bom": {
+ "version": "4.0.0",
+ "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-4.0.0.tgz",
+ "integrity": "sha512-3xurFv5tEgii33Zi8Jtp55wEIILR9eh34FAW00PZf+JnSsTmV/ioewSgQl97JHvgjoRGwPShsWm+IdrxB35d0w==",
+ "dev": true,
+ "license": "MIT",
+ "engines": {
+ "node": ">=8"
+ }
+ },
+ "node_modules/supports-color": {
+ "version": "7.2.0",
+ "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+ "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
+ "dev": true,
+ "license": "MIT",
+ "dependencies": {
+ "has-flag": "^4.0.0"
+ },
+ "engines": {
+ "node": ">=8"
+ }
+ },
"node_modules/supports-preserve-symlinks-flag": {
"version": "1.0.0",
"resolved": "https://registry.npmjs.org/supports-preserve-symlinks-flag/-/supports-preserve-symlinks-flag-1.0.0.tgz",
@@ -1179,6 +2601,21 @@
"dev": true,
"license": "MIT"
},
+ "node_modules/test-exclude": {
+ "version": "8.0.0",
+ "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-8.0.0.tgz",
+ "integrity": "sha512-ZOffsNrXYggvU1mDGHk54I96r26P8SyMjO5slMKSc7+IWmtB/MQKnEC2fP51imB3/pT6YK5cT5E8f+Dd9KdyOQ==",
+ "dev": true,
+ "license": "ISC",
+ "dependencies": {
+ "@istanbuljs/schema": "^0.1.2",
+ "glob": "^13.0.6",
+ "minimatch": "^10.2.2"
+ },
+ "engines": {
+ "node": "20 || >=22"
+ }
+ },
"node_modules/tiny-glob": {
"version": "0.2.9",
"resolved": "https://registry.npmjs.org/tiny-glob/-/tiny-glob-0.2.9.tgz",
@@ -1197,6 +2634,26 @@
"dev": true,
"license": "0BSD"
},
+ "node_modules/type-fest": {
+ "version": "0.8.1",
+ "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.8.1.tgz",
+ "integrity": "sha512-4dbzIzqvjtgiM5rw1k5rEHtBANKmdudhGyBEajN01fEyhaAIhsoKNy6y7+IN93IfpFtwY9iqi7kD+xwKhQsNJA==",
+ "dev": true,
+ "license": "(MIT OR CC0-1.0)",
+ "engines": {
+ "node": ">=8"
+ }
+ },
+ "node_modules/typedarray-to-buffer": {
+ "version": "3.1.5",
+ "resolved": "https://registry.npmjs.org/typedarray-to-buffer/-/typedarray-to-buffer-3.1.5.tgz",
+ "integrity": "sha512-zdu8XMNEDepKKR+XYOXAVPtWui0ly0NtohUscw+UmaHiAWT8hrV1rr//H6V+0DvJ3OQ19S979M0laLfX8rm82Q==",
+ "dev": true,
+ "license": "MIT",
+ "dependencies": {
+ "is-typedarray": "^1.0.0"
+ }
+ },
"node_modules/typescript": {
"version": "5.9.3",
"resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
@@ -1210,6 +2667,139 @@
"engines": {
"node": ">=14.17"
}
+ },
+ "node_modules/update-browserslist-db": {
+ "version": "1.2.3",
+ "resolved": "https://registry.npmjs.org/update-browserslist-db/-/update-browserslist-db-1.2.3.tgz",
+ "integrity": "sha512-Js0m9cx+qOgDxo0eMiFGEueWztz+d4+M3rGlmKPT+T4IS/jP4ylw3Nwpu6cpTTP8R1MAC1kF4VbdLt3ARf209w==",
+ "dev": true,
+ "funding": [
+ {
+ "type": "opencollective",
+ "url": "https://opencollective.com/browserslist"
+ },
+ {
+ "type": "tidelift",
+ "url": "https://tidelift.com/funding/github/npm/browserslist"
+ },
+ {
+ "type": "github",
+ "url": "https://github.com/sponsors/ai"
+ }
+ ],
+ "license": "MIT",
+ "dependencies": {
+ "escalade": "^3.2.0",
+ "picocolors": "^1.1.1"
+ },
+ "bin": {
+ "update-browserslist-db": "cli.js"
+ },
+ "peerDependencies": {
+ "browserslist": ">= 4.21.0"
+ }
+ },
+ "node_modules/which": {
+ "version": "2.0.2",
+ "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
+ "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+ "dev": true,
+ "license": "ISC",
+ "dependencies": {
+ "isexe": "^2.0.0"
+ },
+ "bin": {
+ "node-which": "bin/node-which"
+ },
+ "engines": {
+ "node": ">= 8"
+ }
+ },
+ "node_modules/which-module": {
+ "version": "2.0.1",
+ "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.1.tgz",
+ "integrity": "sha512-iBdZ57RDvnOR9AGBhML2vFZf7h8vmBjhoaZqODJBFWHVtKkDmKuHai3cx5PgVMrX5YDNp27AofYbAwctSS+vhQ==",
+ "dev": true,
+ "license": "ISC"
+ },
+ "node_modules/wrap-ansi": {
+ "version": "6.2.0",
+ "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-6.2.0.tgz",
+ "integrity": "sha512-r6lPcBGxZXlIcymEu7InxDMhdW0KDxpLgoFLcguasxCaJ/SOIZwINatK9KY/tf+ZrlywOKU0UDj3ATXUBfxJXA==",
+ "dev": true,
+ "license": "MIT",
+ "dependencies": {
+ "ansi-styles": "^4.0.0",
+ "string-width": "^4.1.0",
+ "strip-ansi": "^6.0.0"
+ },
+ "engines": {
+ "node": ">=8"
+ }
+ },
+ "node_modules/write-file-atomic": {
+ "version": "3.0.3",
+ "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-3.0.3.tgz",
+ "integrity": "sha512-AvHcyZ5JnSfq3ioSyjrBkH9yW4m7Ayk8/9My/DD9onKeu/94fwrMocemO2QAJFAlnnDN+ZDS+ZjAR5ua1/PV/Q==",
+ "dev": true,
+ "license": "ISC",
+ "dependencies": {
+ "imurmurhash": "^0.1.4",
+ "is-typedarray": "^1.0.0",
+ "signal-exit": "^3.0.2",
+ "typedarray-to-buffer": "^3.1.5"
+ }
+ },
+ "node_modules/y18n": {
+ "version": "4.0.3",
+ "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.3.tgz",
+ "integrity": "sha512-JKhqTOwSrqNA1NY5lSztJ1GrBiUodLMmIZuLiDaMRJ+itFd+ABVE8XBjOvIWL+rSqNDC74LCSFmlb/U4UZ4hJQ==",
+ "dev": true,
+ "license": "ISC"
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+ "version": "3.1.1",
+ "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
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+ "dev": true,
+ "license": "ISC"
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+ "node_modules/yargs": {
+ "version": "15.4.1",
+ "resolved": "https://registry.npmjs.org/yargs/-/yargs-15.4.1.tgz",
+ "integrity": "sha512-aePbxDmcYW++PaqBsJ+HYUFwCdv4LVvdnhBy78E57PIor8/OVvhMrADFFEDh8DHDFRv/O9i3lPhsENjO7QX0+A==",
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+ "license": "MIT",
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+ "decamelize": "^1.2.0",
+ "find-up": "^4.1.0",
+ "get-caller-file": "^2.0.1",
+ "require-directory": "^2.1.1",
+ "require-main-filename": "^2.0.0",
+ "set-blocking": "^2.0.0",
+ "string-width": "^4.2.0",
+ "which-module": "^2.0.0",
+ "y18n": "^4.0.0",
+ "yargs-parser": "^18.1.2"
+ },
+ "engines": {
+ "node": ">=8"
+ }
+ },
+ "node_modules/yargs-parser": {
+ "version": "18.1.3",
+ "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-18.1.3.tgz",
+ "integrity": "sha512-o50j0JeToy/4K6OZcaQmW6lyXXKhq7csREXcDwk2omFPJEwUNOVtJKvmDr9EI1fAJZUyZcRF7kxGBWmRXudrCQ==",
+ "dev": true,
+ "license": "ISC",
+ "dependencies": {
+ "camelcase": "^5.0.0",
+ "decamelize": "^1.2.0"
+ },
+ "engines": {
+ "node": ">=6"
+ }
}
}
}
diff --git a/package.json b/package.json
index 0ed6d9e..0374122 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
{
"name": "domfortify",
- "version": "0.1.0",
+ "version": "0.5.0",
"description": "Retrofit Trusted Types onto a legacy page: claim the realm's default policy so old DOM-XSS sinks get sanitized without touching the code.",
"license": "(MPL-2.0 OR Apache-2.0)",
"homepage": "https://github.com/cure53/DOMFortify",
@@ -65,20 +65,26 @@
"test:browser": "playwright test --config config/playwright.config.ts",
"test": "npm run typecheck && npm run build && npm run test:node && npm run test:fuzz",
"prepublishOnly": "npm run build",
- "test:fuzz": "node test/fuzz/policy.fuzz.js"
+ "test:fuzz": "node test/fuzz/policy.fuzz.js",
+ "build:cov": "rollup -c config/rollup.coverage.config.mjs",
+ "coverage": "rimraf .nyc_output coverage dist/fortify.cov.es.mjs && npm run build:cov && node scripts/coverage.mjs && nyc report --reporter=html --reporter=text --report-dir=coverage"
},
"devDependencies": {
"@playwright/test": "^1.49.0",
"@rollup/plugin-replace": "^6.0.1",
"@rollup/plugin-terser": "^1.0.0",
"@rollup/plugin-typescript": "^12.1.1",
- "dompurify": "^3.2.0",
+ "angular": "1.8.3",
+ "dompurify": "^3.4.11",
"fast-check": "^4.8.0",
+ "jquery": "3.4.1",
+ "nyc": "^18.0.0",
"prettier": "^3.4.2",
"qunit": "^2.23.1",
"rimraf": "^6.0.1",
"rollup": "^4.28.1",
"rollup-plugin-dts": "^6.1.1",
+ "rollup-plugin-istanbul": "^5.0.0",
"tslib": "^2.8.1",
"typescript": "^5.7.2"
},
diff --git a/scripts/coverage.mjs b/scripts/coverage.mjs
new file mode 100644
index 0000000..f32d04b
--- /dev/null
+++ b/scripts/coverage.mjs
@@ -0,0 +1,20 @@
+/**
+ * Runs the node QUnit suite against the Istanbul-instrumented build and writes the collected counters
+ * to .nyc_output so `nyc report` can render them. DOMFORTIFY_COV is set before the suite is imported
+ * (dynamic import, so it is read in time) to select the instrumented module.
+ */
+process.env.DOMFORTIFY_COV = '1';
+
+const QUnit = (await import('qunit')).default;
+const { mkdirSync, writeFileSync } = await import('node:fs');
+await import('../test/test-suite.mjs');
+
+QUnit.on('runEnd', (data) => {
+ if (globalThis.__coverage__) {
+ mkdirSync('.nyc_output', { recursive: true });
+ writeFileSync('.nyc_output/out.json', JSON.stringify(globalThis.__coverage__));
+ }
+ if (data.testCounts.failed > 0) process.exitCode = 1;
+});
+
+QUnit.start();
diff --git a/src/fortify.ts b/src/fortify.ts
index b8e414b..dd5c564 100644
--- a/src/fortify.ts
+++ b/src/fortify.ts
@@ -9,6 +9,7 @@
* - Fails closed: no sanitizer means sinks throw, never leak.
* - Only covers Trusted Types sinks; inline handlers / style / URL props stay open.
*/
+import { cfg, clip, emsg, own, shallowCopy, urlMatches } from './internal';
import type {
DOMFortifyApi,
DOMFortifyConfig,
@@ -16,7 +17,6 @@ import type {
Sanitizer,
SanitizeFn,
ScriptHook,
- UrlConfigRule,
UrlPattern,
ViolationCode,
} from './types';
@@ -28,25 +28,22 @@ interface TtFactory {
defaultPolicy?: unknown;
}
-// Grab natives up front so later prototype-pollution or clobbering can't swap them out.
-const hasOwn = Object.prototype.hasOwnProperty;
+type Report = (code: ViolationCode, detail?: unknown) => void;
+
+// Natives captured up front, so later prototype pollution or clobbering can't swap them out.
const root: typeof globalThis =
typeof globalThis !== 'undefined' ? globalThis : (window as unknown as typeof globalThis);
const doc: Document | undefined = typeof document !== 'undefined' ? document : undefined;
const loc: { href?: unknown } | undefined = (root as unknown as { location?: { href?: unknown } }).location;
-
-const own = (obj: unknown, key: string): boolean => obj != null && hasOwn.call(obj, key);
-const cfg = (obj: unknown, key: string): unknown => (own(obj, key) ? (obj as Record)[key] : undefined);
-const clip = (s: unknown): string => String(s).slice(0, 80);
-const emsg = (e: unknown): string => String((e as { message?: unknown } | undefined)?.message);
-
const TT = (root as unknown as { trustedTypes?: TtFactory }).trustedTypes;
let installed = false;
let cachedStatus: Readonly | null = null;
-// Are we actually enforced? Under enforcement with no default policy yet, a sink write throws.
-// Run this BEFORE we install our policy, or it would always read as "off".
+// --- environment probes --------------------------------------------------------------------------
+
+// Are we actually enforced? Under enforcement with no default policy yet, a sink write throws. Must
+// run BEFORE we install our policy, or it would always read as "off".
function enforcementActive(): boolean {
try {
(doc as Document).createElement('div').innerHTML = 'x';
@@ -56,48 +53,15 @@ function enforcementActive(): boolean {
}
}
-// Copy config off the caller's object, skipping keys that could pollute. Don't JSON-clone - that
-// would corrupt RegExp and functions.
-function shallowCopy(obj: Record): Record {
- const out: Record = {};
- for (const k in obj) {
- if (hasOwn.call(obj, k) && k !== '__proto__' && k !== 'constructor' && k !== 'prototype') out[k] = obj[k];
- }
- return out;
-}
-
-// Test a URL against one or more patterns. String = substring match; RegExp = test. Used for both
-// EXCLUDE and URL_CONFIG, always against the realm's own location.href.
-function urlMatches(pattern: UrlPattern | UrlPattern[] | undefined, url: string): boolean {
- if (pattern == null) return false;
- const list = Array.isArray(pattern) ? pattern : [pattern];
- for (let i = 0; i < list.length; i++) {
- const p = list[i];
- if (typeof p === 'string') {
- if (p !== '' && url.indexOf(p) !== -1) return true;
- } else if (p instanceof RegExp) {
- try {
- if (p.test(url)) return true;
- } catch {
- /* ignore a pattern that throws */
- }
- }
- }
- return false;
-}
-
-// Best-effort CSP injection (opt-in). IMPORTANT: a CSP is honored only when the PARSER
-// inserts it, so document.write during the initial parse is the only path that can actually switch
-// enforcement on - and only for content parsed afterwards. A node appended after parsing is ignored by
-// the CSP engine; we still add it (harmless) but report that injection did NOT take. Returns true only
-// when written during parse.
+// Best-effort CSP injection (opt-in). A CSP is honored only when the PARSER inserts it,
+// so document.write during the initial parse is the one path that can switch enforcement on - and only
+// for content parsed afterwards. We return true only on that path. After parse we still append the node
+// (harmless) but report that it did NOT take.
//
-// `content` is the trusted CSP directive built from config (the derived default, or META_DIRECTIVE).
-// META_DIRECTIVE is developer-controlled and is expected to be trusted, but since this path reaches
-// document.write we still strip the characters that could break out of the content="..." attribute or
-// the tag. A real CSP directive never contains ", <, >, or newlines (single quotes, e.g.
-// 'script', are kept - they are harmless inside the double-quoted attribute), so this is lossless for
-// valid input and neutralizes a hostile or malformed directive. Defense in depth.
+// `content` is the trusted directive built from config. META_DIRECTIVE is developer-controlled, but
+// because this path reaches document.write we still strip the characters that could break out of the
+// content="..." attribute. A valid directive never contains ", <, >, or newlines, so the strip is
+// lossless for good input and neutralizes a hostile or malformed one. Defense in depth.
function injectMeta(content: string): boolean {
if (!doc) return false;
const d = doc as Document & { write?: (s: string) => void; readyState?: string };
@@ -122,12 +86,147 @@ function injectMeta(content: string): boolean {
return false;
}
+// --- config resolution (all own-key only, so a polluted prototype can't loosen anything) ---------
+
+// First URL_CONFIG rule whose `match` hits, else null. Own-key reads only, so a polluted prototype
+// can neither inject a rule nor reach one.
+function selectOverride(options: DOMFortifyConfig, url: string): Record | null {
+ const rules = cfg(options, 'URL_CONFIG');
+ if (!Array.isArray(rules)) return null;
+ for (let i = 0; i < rules.length; i++) {
+ const r = rules[i];
+ // Read `match` own-key only, so a polluted Object.prototype.match can't make a rule that lacks
+ // its own match apply to every URL.
+ if (r && typeof r === 'object' && urlMatches(cfg(r, 'match') as UrlPattern | UrlPattern[] | undefined, url)) {
+ return r as Record;
+ }
+ }
+ return null;
+}
+
+// Does `raw` carry a `.sanitize` method of its own (or on its own class prototype), as opposed to one
+// merely inherited from Object.prototype? We walk the chain but STOP before Object.prototype, so a
+// polluted Object.prototype.sanitize is never mistaken for a real sanitizer. Class-based sanitizers,
+// whose method lives on their own prototype below Object.prototype, still qualify. Tolerant of a
+// hostile getter on the lookup path, which is treated as "not a sanitizer".
+function looksLikeSanitizer(raw: unknown): boolean {
+ try {
+ for (let o: unknown = raw; o && o !== Object.prototype; o = Object.getPrototypeOf(o)) {
+ if (own(o, 'sanitize')) return typeof (o as { sanitize?: unknown }).sanitize === 'function';
+ }
+ } catch {
+ /* a throwing getter on the chain means we cannot trust it as a sanitizer */
+ }
+ return false;
+}
+
+// Normalize whatever the caller handed us into a sanitizer with a `.sanitize` method, or null.
+// DOMPurify's export is itself a callable factory that ALSO carries `.sanitize`, so we must check for
+// `.sanitize` FIRST - otherwise we'd wrap the factory and call the wrong thing. A bare function (e.g. a
+// Sanitizer-API adapter) has no `.sanitize` and falls through to the function case.
+function resolveSanitizer(raw: unknown): Sanitizer | null {
+ if (raw && looksLikeSanitizer(raw)) return raw as Sanitizer;
+ if (typeof raw === 'function') return { sanitize: raw as SanitizeFn };
+ return null;
+}
+
+// The trusted-types directive for INJECT_META. META_DIRECTIVE wins; otherwise we list the policies
+// that will exist: our own `default`, plus `dompurify` unless a bare-function sanitizer is in use.
+function metaDirective(md: unknown, functionSanitizer: boolean): string {
+ if (typeof md === 'string' && md) return md;
+ const ttNames = functionSanitizer ? 'default' : 'default dompurify';
+ return `require-trusted-types-for 'script'; trusted-types ${ttNames};`;
+}
+
+// Exercise the sanitizer once so a broken one fails loudly here, not silently on the first real write.
+// It must return a string; anything else would inject junk into every sink.
+function smokeTest(sanitizer: Sanitizer, config: unknown): { ready: boolean; error: string | null } {
+ try {
+ const out = sanitizer.sanitize('x ', config);
+ return typeof out === 'string'
+ ? { ready: true, error: null }
+ : { ready: false, error: 'sanitize() did not return a string' };
+ } catch (e) {
+ return { ready: false, error: emsg(e) };
+ }
+}
+
+// --- the default policy --------------------------------------------------------------------------
+
+// createHTML: route through the sanitizer, fail closed on any problem. `reentry` is true only while
+// the sanitizer parses our input internally (inert and synchronous), so handing the raw string back
+// is safe and keeps us alive if the sanitizer's own sink re-enters us.
+function makeSanitizeHTML(
+ sanitizer: Sanitizer | null,
+ config: unknown,
+ ready: boolean,
+ report: Report,
+): (s: string) => string | null {
+ let reentry = false;
+ return (s: string): string | null => {
+ if (!ready) {
+ report('sanitizer-unavailable', { sink: 'createHTML' });
+ return null; // fail closed
+ }
+ if (reentry) return s;
+ try {
+ reentry = true;
+ return (sanitizer as Sanitizer).sanitize(s, config) as string;
+ } catch (e) {
+ report('sanitize-threw', { error: emsg(e) });
+ return null; // fail closed - never hand back raw markup on error
+ } finally {
+ reentry = false;
+ }
+ };
+}
+
+// createScript / createScriptURL: code has no safe subset, so refuse by default. A caller hook may
+// allow specific values; if it throws or returns a non-string, we refuse.
+function makeScriptHook(
+ kind: 'createScript' | 'createScriptURL',
+ fn: ScriptHook | null,
+ report: Report,
+): (s: string) => string | null {
+ return (s: string): string | null => {
+ if (fn) {
+ let r: unknown;
+ try {
+ r = fn(s);
+ } catch (e) {
+ report('script-hook-threw', { sink: kind, error: emsg(e) });
+ return null; // fail closed
+ }
+ if (typeof r === 'string') {
+ report('script-sink-allowed', { sink: kind });
+ return r;
+ }
+ }
+ report('script-sink-refused', { sink: kind, sample: clip(s) });
+ return null;
+ };
+}
+
+// --- public entry point --------------------------------------------------------------------------
+
export function init(options: DOMFortifyConfig = {}): Readonly {
if (installed) return cachedStatus as Readonly;
installed = true;
+ // The violation reporter is observability, never control flow. Wrap it so a throwing ON_VIOLATION
+ // can neither abort init() (which would leave us installed with a null status) nor turn a
+ // fail-closed sink - one that should quietly return null - into a thrown exception.
const onv = cfg(options, 'ON_VIOLATION');
- const report = (typeof onv === 'function' ? onv : () => {}) as (code: ViolationCode, detail?: unknown) => void;
+ const report: Report =
+ typeof onv === 'function'
+ ? (code, detail) => {
+ try {
+ (onv as Report)(code, detail);
+ } catch {
+ /* a misbehaving reporter must never break the policy */
+ }
+ }
+ : () => {};
const status: DOMFortifyStatus = {
version: VERSION,
@@ -143,188 +242,139 @@ export function init(options: DOMFortifyConfig = {}): Readonly
const done = (reason: string, code?: ViolationCode): Readonly => {
status.protected = status.defaultPolicyOwned && status.enforcementActive && status.sanitizerReady;
status.reason = reason;
- if (code) report(code, status);
+ // Freeze the snapshot first, then report it: the reporter sees exactly the authoritative status
+ // that gets cached and returned, and has no window to mutate the cached copy.
cachedStatus = Object.freeze({ ...status });
+ if (code) report(code, cachedStatus);
return cachedStatus;
};
- const url = loc && typeof loc.href !== 'undefined' ? String(loc.href) : '';
+ try {
+ const url = loc && typeof loc.href !== 'undefined' ? String(loc.href) : '';
+
+ // EXCLUDE: on a match, stay completely out of the way - no policy, no meta. We do NOT install a
+ // passthrough (that would be a silent XSS hole); under globally delivered enforcement, excluded
+ // pages are the developer's responsibility. Reported via status.excluded.
+ if (urlMatches(cfg(options, 'EXCLUDE') as UrlPattern | UrlPattern[] | undefined, url)) {
+ status.excluded = true;
+ return done('URL matched EXCLUDE; DOMFortify is intentionally inactive on this page.', 'excluded-by-url');
+ }
- // EXCLUDE: on a matching URL, DOMFortify stays completely out of the way - no policy, no meta. It
- // does NOT install a passthrough (that would be a silent XSS hole); under globally delivered
- // enforcement, excluded pages are the developer's responsibility. Reported via status.excluded.
- if (urlMatches(cfg(options, 'EXCLUDE') as UrlPattern | UrlPattern[] | undefined, url)) {
- status.excluded = true;
- return done('URL matched EXCLUDE; DOMFortify is intentionally inactive on this page.', 'excluded-by-url');
- }
+ // INCLUDE: the allow-list complement of EXCLUDE. When set, activate ONLY on matching URLs and stay
+ // inactive (no policy, no meta) elsewhere. EXCLUDE is checked first, so it wins for URLs matching
+ // both. Like EXCLUDE, this only scopes activation safely when enforcement is page-scoped too.
+ const include = cfg(options, 'INCLUDE') as UrlPattern | UrlPattern[] | undefined;
+ if (include != null && !urlMatches(include, url)) {
+ status.excluded = true;
+ return done(
+ 'URL is outside INCLUDE scope; DOMFortify is intentionally inactive on this page.',
+ 'outside-include-scope',
+ );
+ }
- if (!TT || typeof TT.createPolicy !== 'function') {
- return done('Trusted Types not supported; library is inert. Sinks are NOT routed.', 'tt-unsupported');
- }
+ if (!TT || typeof TT.createPolicy !== 'function') {
+ return done('Trusted Types not supported; library is inert. Sinks are NOT routed.', 'tt-unsupported');
+ }
- // URL_CONFIG: the first rule whose `match` hits supplies per-URL overrides. `eff(key)` reads that
- // rule's own key when present, else falls back to the base config - both own-key only, so a polluted
- // prototype can neither inject a rule nor loosen a refusal.
- let override: Record | null = null;
- const rules = cfg(options, 'URL_CONFIG');
- if (Array.isArray(rules)) {
- for (let i = 0; i < rules.length; i++) {
- const r = rules[i] as UrlConfigRule | undefined;
- if (r && urlMatches(r.match, url)) {
- override = r as unknown as Record;
- break;
- }
+ // Resolve config once. `eff(key)` reads the matching URL_CONFIG rule's own key when present, else the
+ // base config - both own-key only. Nothing is re-read later, so runtime clobbering can't retarget
+ // the policy after this point either.
+ const override = selectOverride(options, url);
+ const eff = (key: string): unknown => (override && own(override, key) ? override[key] : cfg(options, key));
+
+ // INJECT_META (opt-in, best-effort - see injectMeta and the README).
+ if (cfg(options, 'INJECT_META') === true) {
+ const directive = metaDirective(cfg(options, 'META_DIRECTIVE'), typeof eff('SANITIZER') === 'function');
+ status.metaInjected = injectMeta(directive);
+ report('meta-injection-attempted', { directive, written: status.metaInjected });
}
- }
- const eff = (key: string): unknown => (override && own(override, key) ? override[key] : cfg(options, key));
-
- // INJECT_META (opt-in, best-effort - see injectMeta and the README). We only attempt it when TT is
- // supported; the directive lists the policies that will exist: our own `default`, plus `dompurify`
- // unless a bare-function sanitizer (e.g. the native Sanitizer API) is in use. META_DIRECTIVE overrides.
- if (cfg(options, 'INJECT_META') === true) {
- const md = cfg(options, 'META_DIRECTIVE');
- const ttNames = typeof eff('SANITIZER') === 'function' ? 'default' : 'default dompurify';
- const directive =
- typeof md === 'string' && md ? md : `require-trusted-types-for 'script'; trusted-types ${ttNames};`;
- status.metaInjected = injectMeta(directive);
- report('meta-injection-attempted', { directive, written: status.metaInjected });
- }
- status.enforcementActive = enforcementActive();
-
- // Resolve config once, reading own keys only so a polluted prototype can't supply a value - and,
- // most importantly, can't loosen a refusal. Nothing is re-read later, so runtime clobbering can't
- // retarget the policy either. URL_CONFIG overrides are applied here via `eff`.
- let rawSan: unknown = eff('SANITIZER');
- if (rawSan === undefined) rawSan = (root as unknown as { DOMPurify?: unknown }).DOMPurify;
- // DOMPurify's export is itself a callable function (the factory) that also exposes `.sanitize`, so
- // check for a `.sanitize` method FIRST - otherwise we'd wrap the factory and call the wrong thing. A
- // bare function (e.g. a Sanitizer-API adapter) has no `.sanitize` and falls through to the function case.
- const DP: Sanitizer | null =
- rawSan && typeof (rawSan as Sanitizer).sanitize === 'function'
- ? (rawSan as Sanitizer)
- : typeof rawSan === 'function'
- ? { sanitize: rawSan as SanitizeFn }
- : null;
- const rawCfg = eff('SANITIZER_CONFIG');
- const sanitizeConfig =
- rawCfg && typeof rawCfg === 'object' ? shallowCopy(rawCfg as Record) : undefined;
-
- // Sink openers count only if they're own functions, so prototype pollution can never open a sink.
- const asCand = eff('ALLOW_SCRIPT');
- const asuCand = eff('ALLOW_SCRIPT_URL');
- const allowScript = typeof asCand === 'function' ? (asCand as ScriptHook) : null;
- const allowScriptURL = typeof asuCand === 'function' ? (asuCand as ScriptHook) : null;
-
- // Smoke-test once so a broken sanitizer fails loudly here, not silently on the first real write. It
- // must return a string - a sanitizer that returns anything else would otherwise inject junk.
- let sanitizerReady = false;
- if (DP && typeof DP.sanitize === 'function') {
- try {
- sanitizerReady = typeof DP.sanitize('x ', sanitizeConfig) === 'string';
- if (!sanitizerReady) report('sanitizer-smoketest-failed', { error: 'sanitize() did not return a string' });
- } catch (e) {
- report('sanitizer-smoketest-failed', { error: emsg(e) });
+ status.enforcementActive = enforcementActive();
+
+ // Sanitizer: explicit SANITIZER (possibly per-URL), else window.DOMPurify. Config is forwarded
+ // verbatim as the second argument, copied to drop pollution-prone keys.
+ let rawSan: unknown = eff('SANITIZER');
+ if (rawSan === undefined) rawSan = (root as unknown as { DOMPurify?: unknown }).DOMPurify;
+ const sanitizer = resolveSanitizer(rawSan);
+ const rawCfg = eff('SANITIZER_CONFIG');
+ const sanitizeConfig =
+ rawCfg && typeof rawCfg === 'object' ? shallowCopy(rawCfg as Record) : undefined;
+
+ // Sink openers count only if they're own functions, so prototype pollution can never open a sink.
+ const asCand = eff('ALLOW_SCRIPT');
+ const asuCand = eff('ALLOW_SCRIPT_URL');
+ const allowScript = typeof asCand === 'function' ? (asCand as ScriptHook) : null;
+ const allowScriptURL = typeof asuCand === 'function' ? (asuCand as ScriptHook) : null;
+
+ let sanitizerReady = false;
+ if (sanitizer) {
+ const result = smokeTest(sanitizer, sanitizeConfig);
+ sanitizerReady = result.ready;
+ if (!result.ready) report('sanitizer-smoketest-failed', { error: result.error });
}
- }
- status.sanitizerReady = sanitizerReady;
+ status.sanitizerReady = sanitizerReady;
- // `reentry` is true only while the sanitizer parses our input internally - inert and synchronous - so
- // handing the raw string straight back is safe, and keeps us alive if its own sink re-enters us.
- let reentry = false;
- const sanitizeHTML = (s: string): string | null => {
- if (!sanitizerReady) {
- report('sanitizer-unavailable', { sink: 'createHTML' });
- return null; // fail closed
+ // createHTML closes over sanitizeConfig; the script hooks refuse unless an own-function hook allows.
+ const policyDef = {
+ createHTML: makeSanitizeHTML(sanitizer, sanitizeConfig, sanitizerReady, report),
+ createScript: makeScriptHook('createScript', allowScript, report),
+ createScriptURL: makeScriptHook('createScriptURL', allowScriptURL, report),
+ };
+
+ // Did someone grab the default slot first? We can't evict them and won't vouch for them.
+ if (TT.defaultPolicy) {
+ return done(
+ 'A default Trusted Types policy already exists; DOMFortify did NOT install and cannot vouch for it. ' +
+ 'Load DOMFortify first, inline in .',
+ 'preexisting-default-policy',
+ );
}
- if (reentry) return s;
+
+ let ours: unknown;
try {
- reentry = true;
- return (DP as Sanitizer).sanitize(s, sanitizeConfig) as string;
+ ours = TT.createPolicy('default', policyDef);
} catch (e) {
- report('sanitize-threw', { error: emsg(e) });
- return null; // fail closed - never hand back raw markup on error
- } finally {
- reentry = false;
+ // Throws when a default policy exists and 'allow-duplicates' is off - someone won the race.
+ return done(
+ `createPolicy("default") threw (${emsg(e)}); another default policy won the race.`,
+ 'default-policy-lost',
+ );
}
- };
- // Code has no safe subset, so refuse by default. A caller hook may allow specific values; if it throws
- // or returns a non-string, we refuse.
- const scriptHook =
- (kind: 'createScript' | 'createScriptURL', fn: ScriptHook | null) =>
- (s: string): string | null => {
- if (fn) {
- let r: unknown;
- try {
- r = fn(s);
- } catch (e) {
- report('script-hook-threw', { sink: kind, error: emsg(e) });
- return null; // fail closed
- }
- if (typeof r === 'string') {
- report('script-sink-allowed', { sink: kind });
- return r;
- }
- }
- report('script-sink-refused', { sink: kind, sample: clip(s) });
- return null;
- };
+ // With 'allow-duplicates' the create can succeed yet not be the active default.
+ if (TT.defaultPolicy && TT.defaultPolicy !== ours) {
+ return done(
+ 'Our policy was created but is not the active default (allow-duplicates race lost). ' +
+ 'Remove "allow-duplicates" from the trusted-types directive.',
+ 'default-policy-not-active',
+ );
+ }
- const policyDef = {
- createHTML: sanitizeHTML,
- createScript: scriptHook('createScript', allowScript),
- createScriptURL: scriptHook('createScriptURL', allowScriptURL),
- };
+ status.defaultPolicyOwned = true;
- // Did someone grab the default slot first? We can't evict them and won't vouch for them.
- if (TT.defaultPolicy) {
+ if (!status.enforcementActive) {
+ return done(
+ 'Default policy installed and slot locked, but TT enforcement is NOT active - sinks are not routed. ' +
+ 'Deliver require-trusted-types-for (header preferred).',
+ 'enforcement-inactive',
+ );
+ }
+ if (!sanitizerReady) {
+ return done(
+ 'Enforcement active and slot locked, but the sanitizer is unavailable - HTML sinks will THROW ' +
+ '(failing closed). Bundle DOMPurify and load it before DOMFortify.',
+ 'failing-closed',
+ );
+ }
return done(
- 'A default Trusted Types policy already exists; DOMFortify did NOT install and cannot vouch for it. ' +
- 'Load DOMFortify first, inline in .',
- 'preexisting-default-policy',
+ `Active: HTML sinks sanitized, script sinks ${allowScript || allowScriptURL ? 'partly allowed by hooks' : 'refused'}.`,
);
- }
-
- let ours: unknown;
- try {
- ours = TT.createPolicy('default', policyDef);
} catch (e) {
- // Throws when a default policy exists and 'allow-duplicates' is off - someone won the race.
- return done(
- `createPolicy("default") threw (${emsg(e)}); another default policy won the race.`,
- 'default-policy-lost',
- );
- }
-
- // With 'allow-duplicates' the create can succeed yet not be the active default.
- if (TT.defaultPolicy && TT.defaultPolicy !== ours) {
- return done(
- 'Our policy was created but is not the active default (allow-duplicates race lost). ' +
- 'Remove "allow-duplicates" from the trusted-types directive.',
- 'default-policy-not-active',
- );
- }
-
- status.defaultPolicyOwned = true;
-
- if (!status.enforcementActive) {
- return done(
- 'Default policy installed and slot locked, but TT enforcement is NOT active - sinks are not routed. ' +
- 'Deliver require-trusted-types-for (header preferred).',
- 'enforcement-inactive',
- );
- }
- if (!sanitizerReady) {
- return done(
- 'Enforcement active and slot locked, but the sanitizer is unavailable - HTML sinks will THROW ' +
- '(failing closed). Bundle DOMPurify and load it before DOMFortify.',
- 'failing-closed',
- );
+ // Defense in depth: init() must never throw or leave the library bricked with a null status. A
+ // hostile getter or exotic environment that slips past the guards above fails closed here, with a
+ // real status object still cached and returned.
+ return done(`init() hit an unexpected error (${emsg(e)}); failing closed.`, 'failing-closed');
}
- return done(
- `Active: HTML sinks sanitized, script sinks ${allowScript || allowScriptURL ? 'partly allowed by hooks' : 'refused'}.`,
- );
}
export function status(): Readonly | null {
diff --git a/src/internal.ts b/src/internal.ts
new file mode 100644
index 0000000..a1bff1b
--- /dev/null
+++ b/src/internal.ts
@@ -0,0 +1,74 @@
+/**
+ * Internal helpers shared by DOMFortify. Everything here is pure and free of side effects: no DOM,
+ * no Trusted Types, no module state. The environment captures and the policy logic live in
+ * fortify.ts; these are the small building blocks it leans on.
+ */
+import type { UrlPattern } from './types';
+
+// Cached up front so later prototype pollution or clobbering can't swap hasOwnProperty out.
+const hasOwn = Object.prototype.hasOwnProperty;
+
+/** True only for an own (non-inherited) property, so a polluted prototype is never consulted. */
+export function own(obj: unknown, key: string): boolean {
+ return obj != null && hasOwn.call(obj, key);
+}
+
+/** Read an own key off a config-like object, else undefined. Never walks the prototype chain. */
+export function cfg(obj: unknown, key: string): unknown {
+ return own(obj, key) ? (obj as Record)[key] : undefined;
+}
+
+/** A short, safe preview of an arbitrary value, for violation reports. */
+export function clip(s: unknown): string {
+ return String(s).slice(0, 80);
+}
+
+/**
+ * Best-effort error message, tolerant of non-Error throws. Must never throw itself: it runs inside
+ * init()'s catch and several sink catches, so a hostile error whose `message` is a throwing getter
+ * must not be able to re-throw from here and brick init(). Falls back to a constant.
+ */
+export function emsg(e: unknown): string {
+ try {
+ return String((e as { message?: unknown } | undefined)?.message);
+ } catch {
+ return 'unknown error';
+ }
+}
+
+/**
+ * Copy an object's own keys, dropping the three that could pollute a prototype. Deliberately not a
+ * JSON clone: that would corrupt the RegExps and functions a sanitizer config may carry.
+ */
+export function shallowCopy(obj: Record): Record {
+ const out: Record = {};
+ for (const k in obj) {
+ if (hasOwn.call(obj, k) && k !== '__proto__' && k !== 'constructor' && k !== 'prototype') {
+ out[k] = obj[k];
+ }
+ }
+ return out;
+}
+
+/**
+ * Test a URL against one or more patterns. A string matches as a substring (the empty string never
+ * matches); a RegExp is test()ed, and a pattern that throws is treated as no match. Used for both
+ * EXCLUDE and URL_CONFIG, always against the realm's own location.href.
+ */
+export function urlMatches(pattern: UrlPattern | UrlPattern[] | undefined, url: string): boolean {
+ if (pattern == null) return false;
+ const list = Array.isArray(pattern) ? pattern : [pattern];
+ for (let i = 0; i < list.length; i++) {
+ const p = list[i];
+ if (typeof p === 'string') {
+ if (p !== '' && url.indexOf(p) !== -1) return true;
+ } else if (p instanceof RegExp) {
+ try {
+ if (p.test(url)) return true;
+ } catch {
+ /* a pattern that throws is treated as no match */
+ }
+ }
+ }
+ return false;
+}
diff --git a/src/types.ts b/src/types.ts
index 812e080..93fa984 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -44,6 +44,7 @@ export type ViolationCode =
| 'default-policy-not-active'
| 'enforcement-inactive'
| 'excluded-by-url'
+ | 'outside-include-scope'
| 'meta-injection-attempted'
| 'failing-closed';
@@ -63,6 +64,16 @@ export interface DOMFortifyConfig {
* meta. Matched against `location.href` (string = substring, RegExp = test).
*/
EXCLUDE?: UrlPattern | UrlPattern[];
+
+ /**
+ * Allow-list complement of `EXCLUDE`. When set, DOMFortify activates ONLY on URLs that match and
+ * stays completely inactive (no policy, no meta) everywhere else - useful for scoping a rollout to
+ * specific routes. `EXCLUDE` still wins for a URL that matches both. Matched against `location.href`
+ * (string = substring, RegExp = test). Best paired with page-scoped enforcement (e.g. INJECT_META):
+ * under a globally delivered enforcement header, non-included pages have enforcement on but no
+ * default policy, so their sinks fail closed.
+ */
+ INCLUDE?: UrlPattern | UrlPattern[];
/** Per-URL configuration overrides; the first matching rule's keys override the base config. */
URL_CONFIG?: UrlConfigRule[];
/**
@@ -86,7 +97,7 @@ export interface DOMFortifyStatus {
defaultPolicyOwned: boolean;
/** Whether the sanitizer passed its smoke test. */
sanitizerReady: boolean;
- /** Whether the current URL matched `EXCLUDE` (DOMFortify intentionally inactive). */
+ /** Whether the URL is out of scope (matched `EXCLUDE`, or fell outside `INCLUDE`); inactive here. */
excluded: boolean;
/** Whether a CSP ` ` injection was attempted via document.write this load. */
metaInjected: boolean;
diff --git a/test/e2e/deployment.spec.ts b/test/e2e/deployment.spec.ts
index 80d0307..0d6c058 100644
--- a/test/e2e/deployment.spec.ts
+++ b/test/e2e/deployment.spec.ts
@@ -112,6 +112,11 @@ for (const file of readdirSync(FIXTURE_DIR).filter((f) => f.endsWith('.html')))
expect(fired, 'with nothing enforcing Trusted Types the DOM-XSS should fire').toBe(true);
expect(status?.protected, 'DOMFortify must not claim protection it does not have').toBeFalsy();
} else if (expectKind === 'protected') {
+ // Native Trusted Types enforcement is now Baseline, but a given Playwright engine build may
+ // predate it. The protection guarantee only exists where enforcement is actually on, so gate
+ // the assertion on it: on an enforcing engine we prove neutralization, elsewhere we skip rather
+ // than assert a guarantee the platform isn't providing (DOMFortify reports this honestly).
+ test.skip(!status?.enforcementActive, 'engine build does not enforce Trusted Types natively');
expect(fired, 'the payload must be neutralized under enforcement').toBe(false);
expect(status?.protected, 'DOMFortify should report the page as protected').toBe(true);
} else if (expectKind === 'best-effort') {
@@ -130,14 +135,41 @@ for (const file of readdirSync(FIXTURE_DIR).filter((f) => f.endsWith('.html')))
// level, so a non-fire there is a browser win, not a DOMFortify bug.
for (const v of VECTORS) {
if (v.firesUnprotected) {
- test(`vector ${v.kind}/${v.name}: fires on the unprotected page`, async ({ page }: { page: Dialoged }) => {
+ test(`vector ${v.kind}/${v.name}: fires on the unprotected page`, async ({
+ page,
+ }: { page: Dialoged }, testInfo) => {
+ // The firesUnprotected corpus is calibrated on the reference engine; Firefox/WebKit parse some
+ // vectors (e.g. svg/onload) differently, so a non-fire there is a browser win, not a real miss.
+ test.skip(testInfo.project.name !== 'chromium', 'firesUnprotected canary runs on the reference engine');
const { fired } = await visit(page, 'unprotected.html', v.payload);
expect(fired, `${v.name} should execute when nothing is enforcing`).toBe(true);
});
}
test(`vector ${v.kind}/${v.name}: neutralized under DOMFortify`, async ({ page }: { page: Dialoged }) => {
const { fired, status } = await visit(page, 'meta.html', v.payload);
+ // Only assert the protection guarantee where the engine actually enforces Trusted Types (see the
+ // note in the deployment matrix above). Non-enforcing engine builds skip rather than fail.
+ test.skip(!status?.enforcementActive, 'engine build does not enforce Trusted Types natively');
expect(status?.protected, 'page should be protected').toBe(true);
expect(fired, `${v.name} must not execute under enforcement`).toBe(false);
});
}
+
+// --- Legacy-library regression: 0.4.0 must not break when heavy libraries are on the page ---------
+// jQuery and AngularJS run internal innerHTML (and AngularJS Function/eval) as they load under
+// enforcement, AFTER DOMFortify has claimed the default policy. The libraries themselves may not fully
+// initialise under Trusted Types - AngularJS needs Function/eval, which DOMFortify refuses by design,
+// and old jQuery's feature-detection can break on sanitized markup. That is inherent to TT enforcement,
+// not a DOMFortify regression, so we do not assert the library's own global. What DOMFortify must
+// guarantee, and what this asserts, is that its HTML-sink protection stays intact while the library's
+// script runs on the page: it stays ready, reports protected, and the payload is neutralized. This
+// reproduces the hosted demo's environment so a real regression is caught in CI before release.
+for (const file of ['with-jquery.html', 'with-angularjs.html']) {
+ test(`legacy library present: ${file} keeps DOMFortify ready and protected`, async ({ page }: { page: Dialoged }) => {
+ const { fired, status } = await visit(page, file, REFERENCE);
+ test.skip(!status?.enforcementActive, 'engine build does not enforce Trusted Types natively');
+ expect(status?.sanitizerReady, 'sanitizer must stay ready with the library present').toBe(true);
+ expect(status?.protected, 'DOMFortify must stay protected with the library present').toBe(true);
+ expect(fired, 'the payload must be neutralized with the library present').toBe(false);
+ });
+}
diff --git a/test/e2e/sink-boundary.spec.ts b/test/e2e/sink-boundary.spec.ts
new file mode 100644
index 0000000..dc28e8e
--- /dev/null
+++ b/test/e2e/sink-boundary.spec.ts
@@ -0,0 +1,83 @@
+/**
+ * Sink-boundary coverage matrix.
+ *
+ * Proves, vector by vector, exactly where DOMFortify's protection begins and ends, so a future change
+ * cannot silently reopen a sink. Every vector runs in genuine page context inside the fixture (see the
+ * note in sink-boundary.runner.js for why this must not move into page.evaluate); the spec only reads
+ * the recorded result after a short settle that lets async sinks (string setTimeout, script.src) land.
+ *
+ * COVERED: must be neutralized under DOMFortify, and must execute on the unprotected canary (which
+ * proves each vector is a real, working sink and that the detector sees it).
+ * BOUNDARY: outside the Trusted Types contract by design (function-handler assignment); documented,
+ * not guarded as a vulnerability.
+ */
+import { test, expect, type Page } from '@playwright/test';
+
+const COVERED = [
+ 'innerHTML',
+ 'outerHTML',
+ 'insertAdjacentHTML',
+ 'createContextualFragment',
+ 'template.innerHTML',
+ 'eval',
+ 'Function',
+ 'setTimeout(string)',
+ 'script.text',
+ 'script.src',
+ 'setAttribute-onclick',
+];
+const BOUNDARY = ['el.onclick = fn'];
+
+interface Probe {
+ status: Record | null;
+ fired: Record;
+ matrix: { label: string; category: string; threw: boolean; msg: string }[];
+}
+
+async function probe(page: Page, fixture: string): Promise {
+ await page.goto(`/test/fixtures/${fixture}`);
+ await page.waitForFunction(() => (window as unknown as { __matrixReady?: boolean }).__matrixReady === true, null, {
+ timeout: 5_000,
+ });
+ await page.waitForTimeout(300); // let async sinks (string setTimeout, script.src) settle
+ return page.evaluate(() => ({
+ status:
+ (
+ window as unknown as { DOMFortify?: { status?: () => Record | null } }
+ ).DOMFortify?.status?.() ?? null,
+ fired: (window as unknown as { __fired: Record }).__fired,
+ matrix: (window as unknown as { __matrix: Probe['matrix'] }).__matrix,
+ }));
+}
+
+// --- Canary: on an unprotected page every covered vector must execute -----------------------------
+test('canary: every covered sink executes on the unprotected page', async ({ page }) => {
+ const { fired } = await probe(page, 'sink-boundary-unprotected.html');
+ for (const label of COVERED) {
+ expect(fired[label], `${label} must execute when nothing is enforcing, or the test is meaningless`).toBe(true);
+ }
+});
+
+// --- Protected: every covered vector is neutralized -----------------------------------------------
+test('every covered sink is neutralized under DOMFortify', async ({ page }) => {
+ const { status, fired } = await probe(page, 'sink-boundary.html');
+ // Only assert the guarantee where the engine actually enforces Trusted Types (matches the rest of
+ // the e2e suite); non-enforcing engine builds skip rather than fail.
+ test.skip(!status?.enforcementActive, 'engine build does not enforce Trusted Types natively');
+ expect(status?.protected, 'page should report protected').toBe(true);
+ for (const label of COVERED) {
+ expect(fired[label] ?? false, `${label} must be neutralized under enforcement`).toBe(false);
+ }
+});
+
+// --- Boundary: function-handler assignment is outside the contract and stays so --------------------
+test('boundary sinks remain outside the Trusted Types contract (documented, not guarded)', async ({ page }) => {
+ const { status, fired } = await probe(page, 'sink-boundary.html');
+ test.skip(!status?.enforcementActive, 'engine build does not enforce Trusted Types natively');
+ for (const label of BOUNDARY) {
+ expect(
+ fired[label] ?? false,
+ `${label} sits outside Trusted Types; if this changes, re-evaluate the threat model and docs`,
+ ).toBe(true);
+ }
+});
diff --git a/test/fixtures/sink-boundary-unprotected.html b/test/fixtures/sink-boundary-unprotected.html
new file mode 100644
index 0000000..0be9e72
--- /dev/null
+++ b/test/fixtures/sink-boundary-unprotected.html
@@ -0,0 +1,12 @@
+
+
+
+
+
+
+
+
+
+
diff --git a/test/fixtures/sink-boundary.html b/test/fixtures/sink-boundary.html
new file mode 100644
index 0000000..7d12fc6
--- /dev/null
+++ b/test/fixtures/sink-boundary.html
@@ -0,0 +1,17 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/test/fixtures/sink-boundary.runner.js b/test/fixtures/sink-boundary.runner.js
new file mode 100644
index 0000000..9e1793d
--- /dev/null
+++ b/test/fixtures/sink-boundary.runner.js
@@ -0,0 +1,123 @@
+/**
+ * Sink-boundary matrix runner (shared by the protected fixture and the unprotected canary).
+ *
+ * It runs every vector in GENUINE page context - this file executes as the page loads, NOT through
+ * Playwright's page.evaluate. That is deliberate and load-bearing: page.evaluate runs in a CDP context
+ * that bypasses Trusted Types enforcement for eval()/Function() specifically (innerHTML and setTimeout
+ * stay gated), so measuring those from page.evaluate falsely reports them as executed. Driving the
+ * sinks from the page itself is the only honest way to test eval/Function. Do not "simplify" this into
+ * page.evaluate.
+ *
+ * Each payload calls window.__H(''); the spec reads window.__fired after a short settle so async
+ * sinks (string setTimeout, script.src) are captured too. window.__matrix records whether each sink
+ * threw (refused). The spec cross-references the two.
+ */
+(function () {
+ var host = document.getElementById('sb') || document.body;
+ var matrix = [];
+ window.__fired = {};
+ window.__H = function (label) {
+ window.__fired[label] = true;
+ };
+ // NOTE: labels are interpolated into injected handler strings, so they MUST stay quote-free.
+ function q(L) {
+ return "window.__H('" + L + "')";
+ }
+ function fresh() {
+ var c = document.createElement('div');
+ host.appendChild(c);
+ return c;
+ }
+ function vec(label, category, run) {
+ var threw = false,
+ msg = '';
+ try {
+ run(label);
+ } catch (e) {
+ threw = true;
+ msg = String((e && e.message) || e).slice(0, 90);
+ }
+ matrix.push({ label: label, category: category, threw: threw, msg: msg });
+ }
+
+ // HTML sinks: inject an inline handler as markup, then click it. Stripped by the sanitizer -> no run.
+ vec('innerHTML', 'html', function (L) {
+ var c = fresh();
+ c.innerHTML = 'x
';
+ var d = c.querySelector('div');
+ if (d) d.click();
+ });
+ vec('outerHTML', 'html', function (L) {
+ var t = fresh();
+ var s = document.createElement('span');
+ t.appendChild(s);
+ s.outerHTML = 'x ';
+ var b = t.querySelector('b');
+ if (b) b.click();
+ });
+ vec('insertAdjacentHTML', 'html', function (L) {
+ var c = fresh();
+ c.insertAdjacentHTML('beforeend', 'x ');
+ var i = c.querySelector('i');
+ if (i) i.click();
+ });
+ vec('createContextualFragment', 'html', function (L) {
+ var c = fresh();
+ var r = document.createRange();
+ r.selectNode(c);
+ c.appendChild(r.createContextualFragment('x '));
+ var u = c.querySelector('u');
+ if (u) u.click();
+ });
+ vec('template.innerHTML', 'html', function (L) {
+ var c = fresh();
+ var t = document.createElement('template');
+ t.innerHTML = 'x ';
+ c.appendChild(t.content.cloneNode(true));
+ var s = c.querySelector('s');
+ if (s) s.click();
+ });
+
+ // String-to-code script sinks: refused by createScript / createScriptURL (return null -> sink throws).
+ vec('eval', 'script', function (L) {
+ eval(q(L));
+ });
+ vec('Function', 'script', function (L) {
+ Function(q(L))();
+ });
+ vec('setTimeout(string)', 'script', function (L) {
+ setTimeout(q(L), 0);
+ });
+ vec('script.text', 'script', function (L) {
+ var s = document.createElement('script');
+ s.text = q(L);
+ fresh().appendChild(s);
+ });
+ vec('script.src', 'script', function (L) {
+ var s = document.createElement('script');
+ s.src = 'data:text/javascript,' + encodeURIComponent(q(L));
+ fresh().appendChild(s);
+ });
+
+ // Event-handler attribute set via setAttribute: also a TrustedScript sink, also refused.
+ vec('setAttribute-onclick', 'attr', function (L) {
+ var b = document.createElement('button');
+ fresh().appendChild(b);
+ b.setAttribute('onclick', q(L));
+ b.click();
+ });
+
+ // Boundary marker: assigning a FUNCTION to a handler property is not a string sink and not reachable
+ // by markup injection; Trusted Types does not see it. Documented as outside the contract, not a bug.
+ vec('el.onclick = fn', 'boundary', function (L) {
+ var b = document.createElement('button');
+ fresh().appendChild(b);
+ b.onclick = function () {
+ window.__H(L);
+ };
+ b.click();
+ });
+
+ window.__matrix = matrix;
+ window.__matrixReady = true;
+})();
diff --git a/test/fixtures/with-angularjs.html b/test/fixtures/with-angularjs.html
new file mode 100644
index 0000000..101f119
--- /dev/null
+++ b/test/fixtures/with-angularjs.html
@@ -0,0 +1,36 @@
+
+
+
+
+ DOMFortify fixture: AngularJS 1.8.3 present
+
+
+
+
+
+
+
+
+
+
+ AngularJS 1.8.3 present
+
+
+
+
+
diff --git a/test/fixtures/with-jquery.html b/test/fixtures/with-jquery.html
new file mode 100644
index 0000000..bbdf200
--- /dev/null
+++ b/test/fixtures/with-jquery.html
@@ -0,0 +1,37 @@
+
+
+
+
+ DOMFortify fixture: jQuery 3.4.1 present
+
+
+
+
+
+
+
+
+
+
+ jQuery 3.4.1 present
+
+
+
+
+
diff --git a/test/test-suite.mjs b/test/test-suite.mjs
index 1930f08..0cd158c 100644
--- a/test/test-suite.mjs
+++ b/test/test-suite.mjs
@@ -7,11 +7,15 @@
* live in `browser-suite.mjs`.
*/
import QUnit from 'qunit';
+import { readFileSync } from 'node:fs';
QUnit.config.autostart = false;
let counter = 0;
-const MODULE_URL = new URL('../dist/fortify.es.mjs', import.meta.url);
+const MODULE_URL = new URL(
+ process.env.DOMFORTIFY_COV ? '../dist/fortify.cov.es.mjs' : '../dist/fortify.es.mjs',
+ import.meta.url,
+);
// Fresh module instance each call, so the module-level "installed once" state never leaks between tests.
function freshModule() {
@@ -101,6 +105,8 @@ function cleanup() {
delete Object.prototype.ALLOW_SCRIPT;
delete Object.prototype.EXCLUDE;
delete Object.prototype.URL_CONFIG;
+ delete Object.prototype.sanitize;
+ delete Object.prototype.match;
}
// --- sanitizer resolution ------------------------------------------------------------------------
@@ -134,6 +140,19 @@ QUnit.module('sanitizer resolution', (hooks) => {
assert.strictEqual(rules.createHTML(''), '[san]', 'wrapped function used');
});
+ QUnit.test('a class-based sanitizer (method on its own prototype) is accepted', async (assert) => {
+ // The .sanitize lives on the class prototype (below Object.prototype), not as an own key. It must
+ // still be recognised: the pollution guard only rejects a sanitize reached from Object.prototype.
+ class S {
+ sanitize(s) {
+ return '[class]' + s;
+ }
+ }
+ const { status, rules } = await install({ tt: makeTT(), doc: makeDoc() }, { SANITIZER: new S() });
+ assert.true(status.sanitizerReady, 'class instance accepted as a sanitizer');
+ assert.strictEqual(rules.createHTML(''), '[class]', 'its prototype sanitize is used');
+ });
+
QUnit.test('sanitizer returning a non-string fails closed', async (assert) => {
const dp = { sanitize: () => ({ not: 'a string' }) };
const { status, rules } = await install({ tt: makeTT(), doc: makeDoc(), DOMPurify: dp });
@@ -166,6 +185,70 @@ QUnit.module('prototype-pollution resistance', (hooks) => {
const { rules } = await install({ tt: makeTT(), doc: makeDoc(), DOMPurify: dp });
assert.strictEqual(rules.createScript('alert(1)'), null, 'still refused');
});
+
+ QUnit.test('polluted Object.prototype.sanitize is not adopted as the sanitizer', async (assert) => {
+ // Identity "sanitize" on the prototype would pass payloads through untouched if adopted. The
+ // global sanitizer is a DOM-clobbered truthy non-sanitizer (e.g. window.DOMPurify -> an element),
+ // which on its own would fail closed; the danger is the prototype method getting mistaken for it.
+ Object.prototype.sanitize = (s) => s;
+ const clobbered = { tagName: 'IMG' }; // truthy, no own .sanitize
+ const { status, rules } = await install({ tt: makeTT(), doc: makeDoc(), DOMPurify: clobbered });
+ assert.false(status.sanitizerReady, 'prototype sanitize is not a usable sanitizer');
+ assert.strictEqual(rules.createHTML(' '), null, 'HTML sink fails closed');
+ });
+
+ QUnit.test('a hostile throwing sanitize getter fails closed, never bricks init', async (assert) => {
+ const evil = {};
+ Object.defineProperty(evil, 'sanitize', {
+ get() {
+ throw new Error('boom');
+ },
+ });
+ const { mod, status } = await install({ tt: makeTT(), doc: makeDoc() }, { SANITIZER: evil });
+ assert.true(status != null, 'init returned a status object (did not throw or brick)');
+ assert.true(mod.status() != null, 'status() is not null after a hostile getter');
+ assert.false(status.sanitizerReady, 'sanitizer not ready');
+ assert.false(status.protected, 'not protected; HTML sinks fail closed');
+ assert.true(status.defaultPolicyOwned, 'default slot still claimed, so nothing else can grab it');
+ });
+
+ QUnit.test(
+ 'a sanitizer throwing a self-referential hostile error still fails closed, never bricks',
+ async (assert) => {
+ // The error's `message` is a getter that re-throws the error itself, so a naive emsg() would
+ // throw every time it is read - defeating both the inner and outer catch and bricking init.
+ const selfRef = {};
+ Object.defineProperty(selfRef, 'message', {
+ get() {
+ throw selfRef;
+ },
+ });
+ const dp = {
+ sanitize() {
+ throw selfRef;
+ },
+ };
+ const { mod, status } = await install({ tt: makeTT(), doc: makeDoc(), DOMPurify: dp });
+ assert.true(status != null, 'init returned a status (did not throw or brick)');
+ assert.true(mod.status() != null, 'status() is not null');
+ assert.false(status.sanitizerReady, 'sanitizer not ready');
+ assert.false(status.protected, 'fails closed');
+ assert.true(status.defaultPolicyOwned, 'default slot still claimed');
+ },
+ );
+
+ QUnit.test('polluted Object.prototype.match cannot apply a rule that lacks its own match', async (assert) => {
+ Object.prototype.match = '/'; // would match every URL if read off the prototype
+ const dp = { sanitize: (_s, c) => JSON.stringify(c) };
+ const env = { tt: makeTT(), doc: makeDoc(), DOMPurify: dp, location: { href: 'https://app.test/home' } };
+ const rule = { SANITIZER_CONFIG: { LOOSENED: true } }; // NO own `match` key
+ const { rules } = await install(env, { SANITIZER_CONFIG: { strict: true }, URL_CONFIG: [rule] });
+ assert.deepEqual(
+ JSON.parse(rules.createHTML('')),
+ { strict: true },
+ 'base config used; the match-less rule did not apply',
+ );
+ });
});
// --- script sinks --------------------------------------------------------------------------------
@@ -295,6 +378,38 @@ QUnit.module('url targeting & meta injection', (hooks) => {
assert.strictEqual(rules.createHTML(''), '[clean]', 'policy active');
});
+ QUnit.test('INCLUDE activates only on matching URLs', async (assert) => {
+ const dp = { sanitize: (s) => '[clean]' + s };
+ const hit = { tt: makeTT(), doc: makeDoc(), DOMPurify: dp, location: { href: 'https://app.test/admin/users' } };
+ const onHit = await install(hit, { INCLUDE: ['/admin/'] });
+ assert.false(onHit.status.excluded, 'in scope, not excluded');
+ assert.true(onHit.status.protected, 'protected on an included URL');
+ assert.strictEqual(onHit.rules.createHTML(''), '[clean]', 'policy active in scope');
+
+ const miss = { tt: makeTT(), doc: makeDoc(), DOMPurify: dp, location: { href: 'https://app.test/home' } };
+ const offHit = await install(miss, { INCLUDE: ['/admin/'] });
+ assert.true(offHit.status.excluded, 'out of scope is reported as excluded');
+ assert.false(offHit.status.protected, 'not protected outside INCLUDE');
+ assert.strictEqual(miss.tt._rules, null, 'no policy claimed outside scope');
+ });
+
+ QUnit.test('EXCLUDE wins over INCLUDE when a URL matches both', async (assert) => {
+ const dp = { sanitize: (s) => '[clean]' + s };
+ const env = { tt: makeTT(), doc: makeDoc(), DOMPurify: dp, location: { href: 'https://app.test/admin/secret' } };
+ const { status } = await install(env, { INCLUDE: ['/admin/'], EXCLUDE: ['/secret'] });
+ assert.true(status.excluded, 'excluded');
+ assert.false(status.protected, 'not protected');
+ assert.strictEqual(env.tt._rules, null, 'no policy claimed');
+ });
+
+ QUnit.test('no INCLUDE means active everywhere (minus EXCLUDE)', async (assert) => {
+ const dp = { sanitize: (s) => '[clean]' + s };
+ const env = { tt: makeTT(), doc: makeDoc(), DOMPurify: dp, location: { href: 'https://app.test/anywhere' } };
+ const { status } = await install(env, {});
+ assert.false(status.excluded, 'active by default');
+ assert.true(status.protected, 'protected everywhere when INCLUDE is unset');
+ });
+
QUnit.test('polluted EXCLUDE cannot silently disable the library', async (assert) => {
Object.prototype.EXCLUDE = '/'; // would match every URL if read off the prototype
const dp = { sanitize: (s) => '[clean]' + s };
@@ -431,3 +546,220 @@ QUnit.module('url targeting & meta injection', (hooks) => {
assert.strictEqual(doc._appended.length, 0, 'no append');
});
});
+
+// --- reentrancy guard ----------------------------------------------------------------------------
+
+QUnit.module('reentrancy guard', (hooks) => {
+ hooks.afterEach(cleanup);
+
+ QUnit.test(
+ 'a sanitizer that re-enters createHTML gets the raw string back; the outer call still sanitizes',
+ async (assert) => {
+ // A sanitizer without its own Trusted Types policy would, on writing to an internal HTML sink,
+ // re-enter our default policy. The guard must hand that re-entrant call the RAW string so the
+ // sanitizer can finish parsing inertly, instead of recursing forever - while the top-level call
+ // still returns sanitized output. holder.createHTML is wired only AFTER install, so the smoke test
+ // during init does not itself re-enter.
+ const holder = {};
+ let reentrantResult;
+ const reentrantSanitizer = {
+ sanitize(input) {
+ if (holder.createHTML) reentrantResult = holder.createHTML('probe ');
+ return '' + input + ' ';
+ },
+ };
+ const { rules } = await install({ tt: makeTT(), doc: makeDoc(), DOMPurify: reentrantSanitizer }, {});
+ holder.createHTML = rules.createHTML;
+
+ const out = rules.createHTML(' ');
+ assert.strictEqual(
+ reentrantResult,
+ 'probe ',
+ 're-entrant createHTML returns the raw string (guard active, no recursion)',
+ );
+ assert.strictEqual(
+ out,
+ ' ',
+ 'the top-level call returns sanitized output, not raw',
+ );
+
+ reentrantResult = undefined;
+ const out2 = rules.createHTML('two ');
+ assert.strictEqual(
+ out2,
+ 'two ',
+ 'the reentry flag resets between top-level calls (still sanitizes)',
+ );
+ assert.strictEqual(reentrantResult, 'probe ', 'and the guard still applies on the next call');
+ },
+ );
+});
+
+// --- public API surface (1.0 contract lock) ------------------------------------------------------
+// Snapshots the public surface so an unintended addition, removal, or rename - to the runtime exports,
+// the status() shape, the config keys, the per-URL override keys, or the violation codes - fails CI
+// loudly. When a change here is INTENTIONAL, update the matching baseline below in the same commit:
+// that diff is the deliberate, reviewable record of a public-contract change.
+
+const DTS = readFileSync(new URL('../dist/fortify.d.ts', import.meta.url), 'utf8');
+
+function interfaceKeys(name) {
+ const start = DTS.indexOf('interface ' + name + ' {');
+ const body = DTS.slice(start, DTS.indexOf('\n}', start));
+ return [...body.matchAll(/^ {4}([A-Za-z_]\w*)\??:/gm)].map((m) => m[1]).sort();
+}
+function unionLiterals(name) {
+ const line = DTS.match(new RegExp('type ' + name + ' = ([^;]+);'))[1];
+ return [...line.matchAll(/'([^']+)'/g)].map((m) => m[1]);
+}
+function exportList(prefix) {
+ return DTS.match(new RegExp('export ' + prefix + '\\{([^}]+)\\}'))[1]
+ .split(',')
+ .map((s) => s.trim())
+ .filter(Boolean)
+ .sort();
+}
+
+QUnit.module('public API surface', (hooks) => {
+ hooks.afterEach(cleanup);
+
+ const EXPECTED_EXPORTS = ['DOMFortify', 'default', 'init', 'status'];
+ const EXPECTED_METHODS = ['init', 'status'];
+ const EXPECTED_STATUS_FIELDS = [
+ 'defaultPolicyOwned',
+ 'enforcementActive',
+ 'excluded',
+ 'metaInjected',
+ 'protected',
+ 'reason',
+ 'sanitizerReady',
+ 'ttSupported',
+ 'version',
+ ];
+ const EXPECTED_CONFIG_KEYS = [
+ 'ALLOW_SCRIPT',
+ 'ALLOW_SCRIPT_URL',
+ 'EXCLUDE',
+ 'INCLUDE',
+ 'INJECT_META',
+ 'META_DIRECTIVE',
+ 'ON_VIOLATION',
+ 'SANITIZER',
+ 'SANITIZER_CONFIG',
+ 'URL_CONFIG',
+ ];
+ const EXPECTED_URLCONFIG_KEYS = ['ALLOW_SCRIPT', 'ALLOW_SCRIPT_URL', 'SANITIZER', 'SANITIZER_CONFIG', 'match'];
+ const EXPECTED_VIOLATION_CODES = [
+ 'tt-unsupported',
+ 'sanitizer-smoketest-failed',
+ 'sanitizer-unavailable',
+ 'sanitize-threw',
+ 'script-hook-threw',
+ 'script-sink-allowed',
+ 'script-sink-refused',
+ 'preexisting-default-policy',
+ 'default-policy-lost',
+ 'default-policy-not-active',
+ 'enforcement-inactive',
+ 'excluded-by-url',
+ 'outside-include-scope',
+ 'meta-injection-attempted',
+ 'failing-closed',
+ ];
+ const EXPECTED_VALUE_EXPORTS = ['DOMFortify', 'DOMFortify as default', 'init', 'status'];
+ const EXPECTED_TYPE_EXPORTS = [
+ 'DOMFortifyApi',
+ 'DOMFortifyConfig',
+ 'DOMFortifyStatus',
+ 'SanitizeFn',
+ 'Sanitizer',
+ 'ScriptHook',
+ 'ViolationCode',
+ ];
+ const hint = (what) =>
+ `public API changed: if intentional, update the ${what} baseline in this test (it is a 1.0 contract change)`;
+
+ QUnit.test('runtime exports and DOMFortify methods are exactly the public set', async (assert) => {
+ const { mod } = await install({ tt: makeTT(), doc: makeDoc(), DOMPurify: { sanitize: (s) => String(s) } }, {});
+ assert.deepEqual(Object.keys(mod).sort(), EXPECTED_EXPORTS, hint('module exports'));
+ assert.deepEqual(Object.keys(mod.DOMFortify).sort(), EXPECTED_METHODS, hint('DOMFortify methods'));
+ });
+
+ QUnit.test('status() shape is exactly the documented set, and the runtime matches the .d.ts', async (assert) => {
+ const { status } = await install({ tt: makeTT(), doc: makeDoc(), DOMPurify: { sanitize: (s) => String(s) } }, {});
+ assert.deepEqual(Object.keys(status).sort(), EXPECTED_STATUS_FIELDS, hint('status fields'));
+ assert.deepEqual(interfaceKeys('DOMFortifyStatus'), EXPECTED_STATUS_FIELDS, hint('DOMFortifyStatus type'));
+ });
+
+ QUnit.test('config keys are exactly the public set', (assert) => {
+ assert.deepEqual(interfaceKeys('DOMFortifyConfig'), EXPECTED_CONFIG_KEYS, hint('DOMFortifyConfig keys'));
+ assert.deepEqual(interfaceKeys('UrlConfigRule'), EXPECTED_URLCONFIG_KEYS, hint('UrlConfigRule keys'));
+ });
+
+ QUnit.test('violation codes are exactly the public set', (assert) => {
+ assert.deepEqual(unionLiterals('ViolationCode'), EXPECTED_VIOLATION_CODES, hint('ViolationCode union'));
+ });
+
+ QUnit.test('the published export lists are exactly the public set', (assert) => {
+ assert.deepEqual(exportList(''), EXPECTED_VALUE_EXPORTS, hint('value exports'));
+ assert.deepEqual(exportList('type '), EXPECTED_TYPE_EXPORTS, hint('type exports'));
+ });
+});
+
+// --- enforcement state & violation reporting -----------------------------------------------------
+
+QUnit.module('enforcement state & reporting', (hooks) => {
+ hooks.afterEach(cleanup);
+
+ QUnit.test(
+ 'default policy owned but enforcement inactive -> not protected, reports enforcement-inactive',
+ async (assert) => {
+ // enforced:false means a string innerHTML assignment does NOT throw, i.e. the probe sees that
+ // require-trusted-types-for is not in effect. We own the slot but our sinks are not routed.
+ const events = [];
+ const { status } = await install(
+ { tt: makeTT(), doc: makeDoc({ enforced: false }), DOMPurify: { sanitize: (s) => String(s) } },
+ { ON_VIOLATION: (code) => events.push(code) },
+ );
+ assert.true(status.defaultPolicyOwned, 'policy is owned');
+ assert.false(status.enforcementActive, 'enforcement is not active');
+ assert.false(status.protected, 'not protected without enforcement');
+ assert.true(/not routed/i.test(status.reason), 'reason explains the sinks are not routed');
+ assert.true(events.includes('enforcement-inactive'), 'ON_VIOLATION received enforcement-inactive');
+ },
+ );
+
+ QUnit.test('a sanitizer that throws at sink time fails closed and reports sanitize-threw', async (assert) => {
+ // Passes the init smoke test (returns a string), then throws on a specific later input - so the
+ // throw is hit at createHTML time, not during resolution. The sink must return null, never raw.
+ const events = [];
+ const sanitizer = {
+ sanitize(s) {
+ if (s === 'BOOM') throw new Error('kaboom');
+ return '';
+ },
+ };
+ const { status, rules } = await install(
+ { tt: makeTT(), doc: makeDoc(), DOMPurify: sanitizer },
+ { ON_VIOLATION: (code) => events.push(code) },
+ );
+ assert.true(status.sanitizerReady, 'smoke test passed, sanitizer is ready');
+ assert.strictEqual(rules.createHTML('BOOM'), null, 'a throw at sink time returns null, never raw markup');
+ assert.true(events.includes('sanitize-threw'), 'ON_VIOLATION received sanitize-threw');
+ });
+
+ QUnit.test('a throwing ON_VIOLATION never breaks the policy', async (assert) => {
+ // The reporter is observability, never control flow: a hostile/buggy reporter that throws must be
+ // swallowed so it cannot turn a fail-closed sink into an exception or brick init.
+ const { status, rules } = await install(
+ { tt: makeTT(), doc: makeDoc(), DOMPurify: { sanitize: () => '' } },
+ {
+ ON_VIOLATION: () => {
+ throw new Error('reporter blew up');
+ },
+ },
+ );
+ assert.true(status != null, 'init still produced a status despite a throwing reporter');
+ assert.strictEqual(rules.createScript('alert(1)'), null, 'the refused script sink still returns null');
+ });
+});
diff --git a/website/index.html b/website/index.html
index 7aab649..87212c5 100644
--- a/website/index.html
+++ b/website/index.html
@@ -5,37 +5,44 @@
DOMFortify - demo running the real library
-
-
+
+
-
+
-
+
-
-
-