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feat(security): allow data: URLs for images and videos. 

Allows known-to-be-safe media types in data URIs.

Part of #8511.
This commit is contained in:
Martin Probst 2016-05-15 11:44:52 +02:00
parent ff36b0384a
commit dd50124254
2 changed files with 14 additions and 5 deletions
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10
modules/@angular/platform-browser/src/security/url_sanitizer.ts
View File

@ -29,12 +29,14 @@ import {assertionsEnabled} from '../../src/facade/lang';
*/
const SAFE_URL_PATTERN = /^(?:(?:https?|mailto|ftp|tel|file):|[^&:/?#]*(?:[/?#]|$))/gi;
/** A pattern that matches safe data URLs. Only matches image and video types. */
const DATA_URL_PATTERN = /^data:(?:image\/(?:bmp|gif|jpeg|jpg|png|tiff|webp)|video\/(?:mpeg|mp4|ogg|webm));base64,[a-z0-9+\/]+=*$/i;
export function sanitizeUrl(url: string): string {
url = String(url);
if (url.match(SAFE_URL_PATTERN)) return url;
if (url.match(SAFE_URL_PATTERN) || url.match(DATA_URL_PATTERN)) return url;
if (assertionsEnabled()) getDOM().log('WARNING: sanitizing unsafe URL value ' + url);
if (assertionsEnabled()) {
getDOM().log('WARNING: sanitizing unsafe URL value ' + url);
}
return 'unsafe:' + url;
}

9
modules/@angular/platform-browser/test/security/url_sanitizer_spec.ts
View File

@ -36,7 +36,9 @@ export function main() {
'TEL:123-123-1234',
'#anchor',
'/page1.md',
'http://JavaScript/my.js'
'http://JavaScript/my.js',
'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/', // Truncated.
'data:video/webm;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/',
];
for (let url of validUrls) {
t.it(`valid ${url}`, () => t.expect(sanitizeUrl(url)).toEqual(url));
@ -56,6 +58,11 @@ export function main() {
'&#x6A&#x61&#x76&#x61&#x73&#x63&#x72&#x69&#x70&#x74:',
'jav	ascript:alert();',
'jav\u0000ascript:alert();',
'data:;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/',
'data:,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/',
'data:iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/',
'data:text/javascript;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/',
'data:application/x-msdownload;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/',
];
for (let url of invalidUrls) {
t.it(`valid ${url}`, () => t.expect(sanitizeUrl(url)).toMatch(/^unsafe:/));