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These rules disallow unsafe coding practices that may result into security
vulnerabilities. We will disallow assignments (e.g., to innerHTML) as well as
calls (e.g., to insertAdjacentHTML) without the use of a pre-defined escaping
function. The escaping functions must be called with a template string.
The function names are hardcoded as Sanitizer.escapeHTML
and escapeHTML
.
The plugin also supports the
Sanitizer API
and calls to .setHTML()
are also allowed by default.
This plugin is built for and used within Mozilla to maintain and improve the security of our products and services.
The method rule disallows certain function calls.
E.g., document.write()
or insertAdjacentHTML()
.
See docs/rules/method.md for more.
The property rule disallows certain assignment expressions, e.g., to innerHTML
.
See docs/rules/property.md for more.
Here are a few examples of code that we do not want to allow:
foo.innerHTML = input.value;
bar.innerHTML = "<a href='"+url+"'>About</a>";
A few examples of allowed practices:
foo.innerHTML = 5;
bar.innerHTML = "<a href='/about.html'>About</a>";
bar.innerHTML = escapeHTML`<a href='${url}'>About</a>`;
With yarn or npm:
$ yarn add -D eslint-plugin-no-unsanitized
$ npm install --save-dev eslint-plugin-no-unsanitized
In your .eslintrc.json
file enable this rule with the following:
{
"extends": ["plugin:no-unsanitized/DOM"]
}
Or:
{
"plugins": ["no-unsanitized"],
"rules": {
"no-unsanitized/method": "error",
"no-unsanitized/property": "error"
}
}
See docs/.