Allows sanitized URLs for CSS properties. These can be abused for information
leakage, but only if the CSS rules are already set up to allow for it. That is,
an attacker cannot cause information leakage without controlling the style rules
present, or a very particular setup.
Fixes#8514.
This is based on Angular 1's implementation, parsing an HTML document
into an inert DOM Document implementation, and then serializing only
specifically whitelisted elements.
It currently does not support SVG sanitization, all SVG elements are
rejected.
If available, the sanitizer uses the `<template>` HTML element as an
inert container.
Sanitization works client and server-side.
Reviewers: rjamet, tbosch , molnarg , koto
Differential Revision: https://reviews.angular.io/D108
Summary:
This adds basic security hooks to Angular 2.
* `SecurityContext` is a private API between core, compiler, and
platform-browser. `SecurityContext` communicates what context a value is used
in across template parser, compiler, and sanitization at runtime.
* `SanitizationService` is the bare bones interface to sanitize values for a
particular context.
* `SchemaElementRegistry.securityContext(tagName, attributeOrPropertyName)`
determines the security context for an attribute or property (it turns out
attributes and properties match for the purposes of sanitization).
Based on these hooks:
* `DomSchemaElementRegistry` decides what sanitization applies in a particular
context.
* `DomSanitizationService` implements `SanitizationService` and adds *Safe
Value*s, i.e. the ability to mark a value as safe and not requiring further
sanitization.
* `url_sanitizer` and `style_sanitizer` sanitize URLs and Styles, respectively
(surprise!).
`DomSanitizationService` is the default implementation bound for browser
applications, in the three contexts (browser rendering, web worker rendering,
server side rendering).
BREAKING CHANGES:
*** SECURITY WARNING ***
Angular 2 Release Candidates do not implement proper contextual escaping yet.
Make sure to correctly escape all values that go into the DOM.
*** SECURITY WARNING ***
Reviewers: IgorMinar
Differential Revision: https://reviews.angular.io/D103
