@angular/core
Version:
Angular - the core framework
133 lines • 14.6 kB
JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { isDevMode } from '../util/is_dev_mode';
import { _sanitizeUrl } from './url_sanitizer';
/**
* Regular expression for safe style values.
*
* Quotes (" and ') are allowed, but a check must be done elsewhere to ensure they're balanced.
*
* ',' allows multiple values to be assigned to the same property (e.g. background-attachment or
* font-family) and hence could allow multiple values to get injected, but that should pose no risk
* of XSS.
*
* The function expression checks only for XSS safety, not for CSS validity.
*
* This regular expression was taken from the Closure sanitization library, and augmented for
* transformation values.
* @type {?}
*/
const VALUES = '[-,."\'%_!# a-zA-Z0-9]+';
/** @type {?} */
const TRANSFORMATION_FNS = '(?:matrix|translate|scale|rotate|skew|perspective)(?:X|Y|3d)?';
/** @type {?} */
const COLOR_FNS = '(?:rgb|hsl)a?';
/** @type {?} */
const GRADIENTS = '(?:repeating-)?(?:linear|radial)-gradient';
/** @type {?} */
const CSS3_FNS = '(?:calc|attr)';
/** @type {?} */
const FN_ARGS = '\\([-0-9.%, #a-zA-Z]+\\)';
/** @type {?} */
const SAFE_STYLE_VALUE = new RegExp(`^(${VALUES}|` +
`(?:${TRANSFORMATION_FNS}|${COLOR_FNS}|${GRADIENTS}|${CSS3_FNS})` +
`${FN_ARGS})$`, 'g');
/**
* Matches a `url(...)` value with an arbitrary argument as long as it does
* not contain parentheses.
*
* The URL value still needs to be sanitized separately.
*
* `url(...)` values are a very common use case, e.g. for `background-image`. With carefully crafted
* CSS style rules, it is possible to construct an information leak with `url` values in CSS, e.g.
* by observing whether scroll bars are displayed, or character ranges used by a font face
* definition.
*
* Angular only allows binding CSS values (as opposed to entire CSS rules), so it is unlikely that
* binding a URL value without further cooperation from the page will cause an information leak, and
* if so, it is just a leak, not a full blown XSS vulnerability.
*
* Given the common use case, low likelihood of attack vector, and low impact of an attack, this
* code is permissive and allows URLs that sanitize otherwise.
* @type {?}
*/
const URL_RE = /^url\(([^)]+)\)$/;
/**
* Checks that quotes (" and ') are properly balanced inside a string. Assumes
* that neither escape (\) nor any other character that could result in
* breaking out of a string parsing context are allowed;
* see http://www.w3.org/TR/css3-syntax/#string-token-diagram.
*
* This code was taken from the Closure sanitization library.
* @param {?} value
* @return {?}
*/
function hasBalancedQuotes(value) {
/** @type {?} */
let outsideSingle = true;
/** @type {?} */
let outsideDouble = true;
for (let i = 0; i < value.length; i++) {
/** @type {?} */
const c = value.charAt(i);
if (c === '\'' && outsideDouble) {
outsideSingle = !outsideSingle;
}
else if (c === '"' && outsideSingle) {
outsideDouble = !outsideDouble;
}
}
return outsideSingle && outsideDouble;
}
/**
* Sanitizes the given untrusted CSS style property value (i.e. not an entire object, just a single
* value) and returns a value that is safe to use in a browser environment.
* @param {?} value
* @return {?}
*/
export function _sanitizeStyle(value) {
value = String(value).trim(); // Make sure it's actually a string.
if (!value)
return '';
// Single url(...) values are supported, but only for URLs that sanitize cleanly. See above for
// reasoning behind this.
/** @type {?} */
const urlMatch = value.match(URL_RE);
if ((urlMatch && _sanitizeUrl(urlMatch[1]) === urlMatch[1]) ||
value.match(SAFE_STYLE_VALUE) && hasBalancedQuotes(value)) {
return value; // Safe style values.
}
if (isDevMode()) {
console.warn(`WARNING: sanitizing unsafe style value ${value} (see http://g.co/ng/security#xss).`);
}
return 'unsafe';
}
/** @enum {number} */
const StyleSanitizeMode = {
/** Just check to see if the property is required to be sanitized or not */
ValidateProperty: 1,
/** Skip checking the property; just sanitize the value */
SanitizeOnly: 2,
/** Check the property and (if true) then sanitize the value */
ValidateAndSanitize: 3,
};
export { StyleSanitizeMode };
/**
* Used to intercept and sanitize style values before they are written to the renderer.
*
* This function is designed to be called in two modes. When a value is not provided
* then the function will return a boolean whether a property will be sanitized later.
* If a value is provided then the sanitized version of that will be returned.
* @record
*/
export function StyleSanitizeFn() { }
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All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {isDevMode} from '../util/is_dev_mode';\nimport {_sanitizeUrl} from './url_sanitizer';\n\n\n/**\n * Regular expression for safe style values.\n *\n * Quotes (\" and ') are allowed, but a check must be done elsewhere to ensure they're balanced.\n *\n * ',' allows multiple values to be assigned to the same property (e.g. background-attachment or\n * font-family) and hence could allow multiple values to get injected, but that should pose no risk\n * of XSS.\n *\n * The function expression checks only for XSS safety, not for CSS validity.\n *\n * This regular expression was taken from the Closure sanitization library, and augmented for\n * transformation values.\n */\nconst VALUES = '[-,.\"\\'%_!# a-zA-Z0-9]+';\nconst TRANSFORMATION_FNS = '(?:matrix|translate|scale|rotate|skew|perspective)(?:X|Y|3d)?';\nconst COLOR_FNS = '(?:rgb|hsl)a?';\nconst GRADIENTS = '(?:repeating-)?(?:linear|radial)-gradient';\nconst CSS3_FNS = '(?:calc|attr)';\nconst FN_ARGS = '\\\\([-0-9.%, #a-zA-Z]+\\\\)';\nconst SAFE_STYLE_VALUE = new RegExp(\n    `^(${VALUES}|` +\n        `(?:${TRANSFORMATION_FNS}|${COLOR_FNS}|${GRADIENTS}|${CSS3_FNS})` +\n        `${FN_ARGS})$`,\n    'g');\n\n/**\n * Matches a `url(...)` value with an arbitrary argument as long as it does\n * not contain parentheses.\n *\n * The URL value still needs to be sanitized separately.\n *\n * `url(...)` values are a very common use case, e.g. for `background-image`. With carefully crafted\n * CSS style rules, it is possible to construct an information leak with `url` values in CSS, e.g.\n * by observing whether scroll bars are displayed, or character ranges used by a font face\n * definition.\n *\n * Angular only allows binding CSS values (as opposed to entire CSS rules), so it is unlikely that\n * binding a URL value without further cooperation from the page will cause an information leak, and\n * if so, it is just a leak, not a full blown XSS vulnerability.\n *\n * Given the common use case, low likelihood of attack vector, and low impact of an attack, this\n * code is permissive and allows URLs that sanitize otherwise.\n */\nconst URL_RE = /^url\\(([^)]+)\\)$/;\n\n/**\n * Checks that quotes (\" and ') are properly balanced inside a string. Assumes\n * that neither escape (\\) nor any other character that could result in\n * breaking out of a string parsing context are allowed;\n * see http://www.w3.org/TR/css3-syntax/#string-token-diagram.\n *\n * This code was taken from the Closure sanitization library.\n */\nfunction hasBalancedQuotes(value: string) {\n  let outsideSingle = true;\n  let outsideDouble = true;\n  for (let i = 0; i < value.length; i++) {\n    const c = value.charAt(i);\n    if (c === '\\'' && outsideDouble) {\n      outsideSingle = !outsideSingle;\n    } else if (c === '\"' && outsideSingle) {\n      outsideDouble = !outsideDouble;\n    }\n  }\n  return outsideSingle && outsideDouble;\n}\n\n/**\n * Sanitizes the given untrusted CSS style property value (i.e. not an entire object, just a single\n * value) and returns a value that is safe to use in a browser environment.\n */\nexport function _sanitizeStyle(value: string): string {\n  value = String(value).trim();  // Make sure it's actually a string.\n  if (!value) return '';\n\n  // Single url(...) values are supported, but only for URLs that sanitize cleanly. See above for\n  // reasoning behind this.\n  const urlMatch = value.match(URL_RE);\n  if ((urlMatch && _sanitizeUrl(urlMatch[1]) === urlMatch[1]) ||\n      value.match(SAFE_STYLE_VALUE) && hasBalancedQuotes(value)) {\n    return value;  // Safe style values.\n  }\n\n  if (isDevMode()) {\n    console.warn(\n        `WARNING: sanitizing unsafe style value ${value} (see http://g.co/ng/security#xss).`);\n  }\n\n  return 'unsafe';\n}\n\n\n/**\n * A series of flags to instruct a style sanitizer to either validate\n * or sanitize a value.\n *\n * Because sanitization is dependent on the style property (i.e. style\n * sanitization for `width` is much different than for `background-image`)\n * the sanitization function (e.g. `StyleSanitizerFn`) needs to check a\n * property value first before it actually sanitizes any values.\n *\n * This enum exist to allow a style sanitization function to either only\n * do validation (check the property to see whether a value will be\n * sanitized or not) or to sanitize the value (or both).\n *\n * @publicApi\n */\nexport const enum StyleSanitizeMode {\n  /** Just check to see if the property is required to be sanitized or not */\n  ValidateProperty = 0b01,\n  /** Skip checking the property; just sanitize the value */\n  SanitizeOnly = 0b10,\n  /** Check the property and (if true) then sanitize the value */\n  ValidateAndSanitize = 0b11,\n}\n\n/**\n * Used to intercept and sanitize style values before they are written to the renderer.\n *\n * This function is designed to be called in two modes. When a value is not provided\n * then the function will return a boolean whether a property will be sanitized later.\n * If a value is provided then the sanitized version of that will be returned.\n */\nexport interface StyleSanitizeFn {\n  (prop: string, value: string|null, mode?: StyleSanitizeMode): any;\n}\n"]}