/
jsanity-0.3.js
1408 lines (1237 loc) · 56.7 KB
/
jsanity-0.3.js
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if ( typeof jSanity !== 'undefined' ) throw ( "jSanity has been defined, please check if there's any duplicate reference." );
jSanity = {};
( function ( ns ) {
"use strict";
// Default sanitization options
var defaults = {
inputString: '', // The string to sanitize and put into the DOM
maxWidth: '600px', // Recommended to prevent outside UI from being pushed to the right
maxHeight: '200px', // Recommended to prevent outside UI from being pushed down
overflow: 'hidden', // Recommended to be set set to 'hidden' or 'scroll' so that sanitized content is
// constrained to the target element's box
allowLinks: true, // Allow links (applies where user interaction is required, eg: anchors)
linkClickCallback: null, // Code that will run in the onclick for any links
customProtocols: {}, // Additional protocol schemes to allow through sanitization
allowRelativeURLs: false, // Implementation TBD
allowAudioVideo: false, // Allow HTML5 AUDIO and VIDEO elements
unsupportedContentCallback: null, // Callback for unsupported content, such as elements/attributes/styles
externalContentCallback: // Callback to handle URLs referencing external content
// Caller should override this function with a more appropriate one given the hosting scenario
function ( context, name, data, knownProtocols ) {
var validatedProtocol;
// Allow SRC attributes through by default, block other external references
if ( ( context === "attribute" ) && ( name === "src" ) ) {
for ( var protocol in knownProtocols ) {
if ( !knownProtocols.hasOwnProperty( protocol ) ) {
continue; // Skip any properties on the prototype
}
if ( data.substring( 0, protocol.length ) === protocol ) {
validatedProtocol = true;
break;
}
}
}
if ( !validatedProtocol ) {
// Important to return data in the CSS URL format as necessary, otherwise in directModifySource mode the property won't be overridden
if ( context === "CSSURL" ) {
data = "url(\"about:blank\")";
} else {
data = "about:blank";
}
}
return data;
},
isolatedTargetDOM: false, // Should have no impact on sanitization in practice, only performance
directModifySource: true, // Do not maintain a destination DOM, rather modify the source DOM directly (for perf, requires non-isolated target DOM)
attributePrefix: 'jSanity', // Prefix NAME and ID attributes with this string
// The ID of the target element is also used in the prefix, if there is one
dataAttributeCallback: null, // Callback for handling of data-* attributes which are otherwise unsafe by default
debugLevel: 0, // Debug level > 0 will log dropped elements, attributes, etc. to the console
onFinishedCallback: null, // Callback method with purified DOM tree as parameter, if this property be set, then the sanitize will be a asynchronize call,
// Otherwise this will be a synchronize call
allowStylesheetsOnDirectModifySource: false, // Allow STYLE elements to be added to the source DOM
};
var schedulerClass = function () {
this.sync = true;
this.jobs = [];
this.id = schedulerClass.globalId++;
this.listnerPosfix = 0;
this.onCompletedListners = {};
this.onNewJobAddedListners = {};
this.useSync = function () {
this.sync = true;
};
this.useAsync = function () {
this.sync = false;
};
this.addNewJob = function ( fn ) {
this.jobs.push( fn );
for ( var key in this.onNewJobAddedListners ) {
if ( this.onNewJobAddedListners.hasOwnProperty( key ) ) {
try {
this.onNewJobAddedListners[ key ]( fn );
} catch ( e ) {}
}
}
};
this.registerOnJobCompleted = function ( callback ) {
var handler;
this.listnerPosfix += 1;
handler = this.id.toString() + this.listnerPosfix.toString();
this.onCompletedListners[ handler ] = callback;
return handler;
};
this.registerOnNewJobAdded = function ( callback ) {
var handler;
this.listnerPosfix += 1;
handler = this.id.toString() + this.listnerPosfix.toString();
this.onNewJobAddedListners[ handler ] = callback;
return handler;
};
this.unRegisterListner = function ( handlerId ) {
if ( this.onCompletedListners[ handlerId ] ) {
delete this.onCompletedListners[ handlerId ];
} else if ( this.onNewJobAddedListners[ handlerId ] ) {
delete this.onNewJobAddedListners[ handlerId ];
}
};
this.run = function () {
var currJob = null;
var conti = this.sync;
var start, end;
start = new Date().getTime();
do {
currJob = this.jobs.pop();
if ( currJob ) {
try {
currJob();
} catch ( e ) {}
} else {
for ( var key in this.onCompletedListners ) {
if ( this.onCompletedListners.hasOwnProperty( key ) ) {
try {
this.onCompletedListners[ key ]();
} catch ( e ) {}
}
}
}
end = new Date().getTime();
if ( currJob && !this.sync ) {
if ( ( end - start ) < schedulerClass.maxExecutionTimeForMergedAsyncJobs ) {
conti = true;
} else {
conti = false;
}
}
}
while ( conti && currJob );
if ( !this.sync && currJob ) {
var stepMethod = ( function ( method, context ) {
return function () {
method.apply( context );
}
} )( this.run, this );
setTimeout( stepMethod, 0 );
}
};
};
schedulerClass.globalId = 0;
schedulerClass.maxExecutionTimeForMergedAsyncJobs = 15;
var jSanityClass = function ( schedulerClass, options ) {
var sch = new schedulerClass();
if ( options.onFinishedCallback ) {
sch.useAsync();
} else {
sch.useSync();
}
// Define the known HTML elements and attributes for various namespaces
// TBD: Continue to fill these out
// Attributes are not currently tied to specific elements, so watch out for attributes with different
// meanings depending on the attribute on which they are applied
var knownHTML = {
'default': {
knownElements: {
// Groupings borrowed from https://developer.mozilla.org/en-US/docs/HTML/HTML5/HTML5_element_list
// Root element
'html': 1,
// Document metadata
'style': 1,
// Scripting
'noscript': 1,
// Sections
'body': 1,
'section': 1,
'nav': 1,
'article': 1,
'aside': 1,
'h1': 1,
'h2': 1,
'h3': 1,
'h4': 1,
'h5': 1,
'h6': 1,
'hgroup': 1,
'header': 1,
'footer': 1,
'address': 1,
// Grouping content
'p': 1,
'hr': 1,
'pre': 1,
'blockquote': 1,
'ol': 1,
'ul': 1,
'li': 1,
'dl': 1,
'dt': 1,
'dd': 1,
'figure': 1,
'figcaption': 1,
'div': 1,
// Text-level semantics
'a': 1,
'em': 1,
'strong': 1,
'small': 1,
's': 1,
'cite': 1,
'q': 1,
'dfn': 1,
'abbr': 1,
'code': 1,
'var': 1,
'samp': 1,
'kbd': 1,
'sub': 1,
'sup': 1,
'i': 1,
'b': 1,
'u': 1,
'mark': 1,
'ruby': 1,
'rt': 1,
'rp': 1,
'bdi': 1,
'bdo': 1,
'span': 1,
'br': 1,
'wbr': 1,
// Edits
'ins': 1,
'del': 1,
// Embedded content
'img': 1,
'video': 1,
'audio': 1,
'source': 1,
'map': 1,
'area': 1,
'svg': 1,
'math': 1,
// Tabular data
'table': 1,
'caption': 1,
'colgroup': 1,
'col': 1,
'tbody': 1,
'thead': 1,
'tfoot': 1,
'tr': 1,
'td': 1,
'th': 1,
// Forms
'input': 1,
'button': 1,
'select': 1,
'datalist': 1,
'optgroup': 1,
'option': 1,
'textarea': 1,
'progress': 1,
'meter': 1,
// Interactive elements
'details': 1,
'summary': 1,
'command': 1,
'menu': 1,
// Deprecated but supported by jSanity
'center': 1,
'font': 1,
},
// Notable elements explicitly not on this list
// form [due to phishing potential], isindex, frame, iframe, script, embed, object, param...
// TBD (Possibly unsafe, possibly just unnecessary, ???):
// head, title, base, link, meta, xmlns, version, track, canvas, keygen, output, label, legend, fieldset
knownAttributes: {
// Global attributes borrowed from https://developer.mozilla.org/en-US/docs/HTML/Global_attributes
'class': 1,
'contenteditable': 1,
'dir': 1,
'hidden': 1,
'id': 1,
'lang': 1,
'spellcheck': 1,
'tabindex': 1,
'title': 1,
// Style element [not supported currently]
// If/when supported, consider adding attributes from https://developer.mozilla.org/en-US/docs/HTML/Element/style
// Attributes in support of various standard elements
'cite': 1,
'reversed': 1,
'start': 1,
'value': 1,
'href': 1,
'hreflang': 1,
'rel': 1,
'datetime': 1,
'alt': 1,
'height': 1,
'ismap': 1,
'src': 1,
'width': 1,
'usemap': 1,
'autoplay': 1,
'controls': 1,
'loop': 1,
'muted': 1,
'preload': 1,
'coords': 1,
'shape': 1,
'span': 1,
'colspan': 1,
'headers': 1,
'rowspan': 1,
'scope': 1,
'checked': 1,
'disabled': 1,
'max': 1,
'maxlength': 1,
'min': 1,
'name': 1,
'placeholder': 1,
'readonly': 1,
'selectiondirection': 1,
'size': 1,
'step': 1,
'selectedindex': 1,
'label': 1,
'selected': 1,
'cols': 1,
'rows': 1,
'selectionend': 1,
'selectionstart': 1,
'wrap': 1,
'low': 1,
'high': 1,
'optimum': 1,
'open': 1,
// Deprecated but supported by jSanity
'align': 1,
'face': 1,
'hspace': 1,
'vspace': 1,
'border': 1,
'cellpadding': 1,
'cellspacing': 1
}
// Explicitly unsafe attributes:
// on*, accesskey, manifest, form, formaction...
// TBD (Possibly unsafe, possibly just unnecessary, ???):
// contextmenu [may abuse existing menus on the page?], draggable, dropzone, download,
// media [different for different elements], ping,
// target [We should implement a callback to allow hosts to validate], type, crossorigin,
// type [for source element at minimum, for input element as well, command element?, menu element?],
// accept, autocomplete, autofocus, autosave, formenctype, formmethod, formnovalidate, formtarget,
// list, multiple, pattern, required, radiogroup
// TBD (Add with a callback)
// poster [for the video element, add with callback to regulate the supplied URL], icon
// The style attribute is handled separately
},
// Attributes on Math, SVG and potentially other elements should be under their respective namespaces
// SVG namespace
// TBD
'http://www.w3.org/2000/svg': {
knownElements: {
'a': 1,
'altglyph': 1,
'altglyphdef': 1,
'altglyphitem': 1,
'circle': 1,
'clippath': 1,
'defs': 1,
'desc': 1,
'ellipse': 1,
'feblend': 1,
'fecolormatrix': 1,
'fecomponenttransfer': 1,
'fecomposite': 1,
'feconvolvematrix': 1,
'fediffuselighting': 1,
'fedisplacementmap': 1,
'fedistantlight': 1,
'feflood': 1,
'fefunca': 1,
'fefuncb': 1,
'fefuncg': 1,
'fefuncr': 1,
'fegaussianblur': 1,
'femerge': 1,
'femergenode': 1,
'femorphology': 1,
'feoffset': 1,
'fepointlight': 1,
'fespecularlighting': 1,
'fespotlight': 1,
'fetile': 1,
'feturbulence': 1,
'filter': 1,
'font': 1,
'g': 1,
'glyph': 1,
'glyphref': 1,
'hkern': 1,
'image': 1,
'line': 1,
'lineargradient': 1,
'marker': 1,
'mask': 1,
'metadata': 1,
'mpath': 1,
'path': 1,
'pattern': 1,
'polygon': 1,
'polyline': 1,
'radialgradient': 1,
'rect': 1,
'stop': 1,
'style': 1,
'svg': 1,
'switch': 1,
'symbol': 1,
'text': 1,
'textpath': 1,
'title': 1,
'tref': 1,
'tspan': 1,
'view': 1,
'vkern': 1
},
knownAttributes: {
'accumulate': 1,
'additive': 1,
'alignment-baseline': 1,
'amplitude': 1,
'ascent': 1,
'attributetype': 1,
'azimuth': 1,
'basefrequency': 1,
'baseline-shift': 1,
'bias': 1,
'calcmode': 1,
'class': 1,
'clip': 1,
'clip-rule': 1,
'clippathunits': 1,
'color': 1,
'color-interpolation': 1,
'color-interpolation-filters': 1,
'color-rendering': 1,
'cx': 1,
'cy': 1,
'd': 1,
'diffuseconstant': 1,
'direction': 1,
'display': 1,
'divisor': 1,
'dominant-baseline': 1,
'dur': 1,
'dx': 1,
'dy': 1,
'edgemode': 1,
'elevation': 1,
'exponent': 1,
'fill': 1,
'fill-opacity': 1,
'fill-rule': 1,
'filterunits': 1,
'flood-color': 1,
'flood-opacity': 1,
'font-family': 1,
'font-size': 1,
'font-size-adjust': 1,
'font-stretch': 1,
'font-style': 1,
'font-variant': 1,
'font-weight': 1,
'fx': 1,
'fy': 1,
'g1': 1,
'g2': 1,
'glyph-name': 1,
'glyphref': 1,
'gradienttransform': 1,
'gradientunits': 1,
'height': 1,
'id': 1,
'image-rendering': 1,
'in': 1,
'in2': 1,
'intercept': 1,
'k': 1,
'k1': 1,
'k2': 1,
'k3': 1,
'k4': 1,
'kernelmatrix': 1,
'kernelunitlength': 1,
'kerning': 1,
'keypoints': 1,
'lang': 1,
'lengthadjust': 1,
'letter-spacing': 1,
'lighting-color': 1,
'limitingconeangle': 1,
'local': 1,
'markerheight': 1,
'markerunits': 1,
'markerwidth': 1,
'maskcontentunits': 1,
'maskunits': 1,
'max': 1,
'media': 1,
'method': 1,
'min': 1,
'mode': 1,
'name': 1,
'numoctaves': 1,
'offset': 1,
'opacity': 1,
'operator': 1,
'order': 1,
'orient': 1,
'orientation': 1,
'origin': 1,
'overflow': 1,
'path': 1,
'pathlength': 1,
'patterncontentunits': 1,
'patterntransform': 1,
'patternunits': 1,
'points': 1,
'pointsatx': 1,
'pointsaty': 1,
'pointsatz': 1,
'preservealpha': 1,
'preserveaspectratio': 1,
'primitiveunits': 1,
'r': 1,
'radius': 1,
'refx': 1,
'refy': 1,
'repeatcount': 1,
'repeatdur': 1,
'restart': 1,
'result': 1,
'rotate': 1,
'rx': 1,
'ry': 1,
'scale': 1,
'seed': 1,
'shape-rendering': 1,
'slope': 1,
'specularconstant': 1,
'specularexponent': 1,
'spreadmethod': 1,
'startoffset': 1,
'stddeviation': 1,
'stitchtiles': 1,
'stop-color': 1,
'stop-opacity': 1,
'stroke': 1,
'stroke-dasharray': 1,
'stroke-dashoffset': 1,
'stroke-linecap': 1,
'stroke-linejoin': 1,
'stroke-miterlimit': 1,
'stroke-opacity': 1,
'stroke-width': 1,
'style': 1,
'surfacescale': 1,
'systemlanguage': 1,
'tablevalues': 1,
'targetx': 1,
'targety': 1,
'text-anchor': 1,
'text-decoration': 1,
'text-rendering': 1,
'textlength': 1,
'transform': 1,
'type': 1,
'u1': 1,
'u2': 1,
'unicode-bidi': 1,
'values': 1,
'vert-adv-y': 1,
'vert-origin-x': 1,
'vert-origin-y': 1,
'viewbox': 1,
'visibility': 1,
'width': 1,
'word-spacing': 1,
'writing-mode': 1,
'x': 1,
'x1': 1,
'x2': 1,
'xchannelselector': 1,
'y': 1,
'y1': 1,
'y2': 1,
'ychannelselector': 1,
'z': 1,
'zoomandpan': 1,
}
}
// Math namespace
// TBD
};
var knownProtocols = {
'http://': 1,
'https://': 1,
'ftp://': 1,
'mailto:': 1
};
var knownCSSProperties = {
// CSS Properties borrowed from http://www.w3schools.com/cssref/default.asp
// Animation properties
// TBD
// Background properties
'background-attachment': 1,
'background-color': 1,
'background-image': 1,
'background-position': 1,
'background-repeat': 1,
'background-clip': 1,
'background-origin': 1,
'background-size': 1,
// Border and outline properties
'border': 1,
'border-bottom': 1,
'border-bottom-color': 1,
'border-bottom-style': 1,
'border-bottom-width': 1,
'border-color': 1,
'border-left': 1,
'border-left-color': 1,
'border-left-style': 1,
'border-left-width': 1,
'border-right': 1,
'border-right-color': 1,
'border-right-style': 1,
'border-right-width': 1,
'border-style': 1,
'border-top': 1,
'border-top-color': 1,
'border-top-style': 1,
'border-top-width': 1,
'border-width': 1,
'outline': 1,
'outline-color': 1,
'outline-style': 1,
'outline-width': 1,
'border-bottom-left-radius': 1,
'border-bottom-right-radius': 1,
'border-radius': 1,
'border-top-left-radius': 1,
'border-top-right-radius': 1,
'box-decoration-break': 1,
'box-shadow': 1,
// Box properties
'overflow-x': 1,
'overflow-y': 1,
'overflow-style': 1,
'rotation': 1,
'rotation-point': 1,
// Color properties
'opacity': 1,
// Other color properties TBD
// Content for paged media properties
// TBD
// Dimension properties
'height': 1,
'max-height': 1,
'max-width': 1,
'min-height': 1,
'min-width': 1,
'width': 1,
// Flexible box properties
'box-align': 1,
'box-direction': 1,
'box-flex': 1,
'box-flex-group': 1,
'box-lines': 1,
'box-ordinal-group': 1,
'box-orient': 1,
'box-pack': 1,
// Font properties
'font': 1,
'font-family': 1,
'font-size': 1,
'font-style': 1,
'font-variant': 1,
'font-weight': 1,
'font-size-adjust': 1,
'font-stretch': 1,
// Generated Content Properties
// TBD, seems scary to support...
// Grid properties
'grid-columns': 1,
'grid-rows': 1,
// Hyperlink properties
// TBD, will require callback support consistent with target attribute
// Linebox properties
// TBD
// List properties
// TBD, will require callback support for image
// Margin properties
'margin': 1,
'margin-bottom': 1,
'margin-left': 1,
'margin-right': 1,
'margin-top': 1,
// Marquee properties
// TBD
// Multi-column properties
'column-count': 1,
'column-fill': 1,
'column-gap': 1,
'column-rule': 1,
'column-rule-color': 1,
'column-rule-style': 1,
'column-rule-width': 1,
'column-span': 1,
'column-width': 1,
'columns': 1,
// Padding properties
'padding': 1,
'padding-bottom': 1,
'padding-left': 1,
'padding-right': 1,
'padding-top': 1,
// Paged media properties
// TBD
// Positioning properties
'bottom': 1,
'clear': 1,
'clip': 1,
'display': 1,
'float': 1,
'left': 1,
'overflow': 1,
'position': 1, // The value of position is regulated in code below so as to mitigate overlay attacks
'right': 1,
'top': 1,
'visibility': 1,
'z-index': 1,
// Print properties
// TBD
// Ruby properties
// TBD
// Speech properties
// TBD
// Table properties
'border-collapse': 1,
'border-spacing': 1,
'caption-side': 1,
'empty-cells': 1,
'table-layout': 1,
// Text properties
'color': 1,
'direction': 1,
'letter-spacing': 1,
'line-height': 1,
'text-align': 1,
'text-decoration': 1,
'text-indent': 1,
'text-transform': 1,
'unicode-bidi': 1,
'vertical-align': 1,
'white-space': 1,
'word-spacing': 1,
'hanging-punctuation': 1,
'punctuation-trim': 1,
'text-align-last': 1,
'text-justify': 1,
'text-outline': 1,
'text-shadow': 1,
'text-wrap': 1,
'word-break': 1,
'word-wrap': 1,
// 2D/3D transform properties
// TBD
// Transition properties
// TBD
// User-interface properties
// TBD (At minimum the icon property will require a callback)
// TBD (Possibly unsafe, possibly just unnecessary, ???):
// background [CSS shorthand property not currently implemented, may not actually be necessary, would require parsing],
// border-image-* [no current browser support (?)]
// cursor [supports a URL], text-overflow [may allow overlay attack?]
// SVG
'alignment-baseline': 1,
'baseline-shift': 1,
'clip-rule': 1,
'color-interpolation': 1,
'color-interpolation-filters': 1,
'color-rendering': 1,
'dominant-baseline': 1,
'fill-opacity': 1,
'fill-rule': 1,
'flood-color': 1,
'flood-opacity': 1,
'image-rendering': 1,
'kerning': 1,
'lighting-color': 1,
'shape-rendering': 1,
'stop-color': 1,
'stop-opacity': 1,
'stroke': 1,
'stroke-dasharray': 1,
'stroke-dashoffset': 1,
'stroke-linecap': 1,
'stroke-linejoin': 1,
'stroke-miterlimit': 1,
'stroke-opacity': 1,
'stroke-width': 1,
'text-anchor': 1,
'text-rendering': 1,
'writing-mode': 1
}
// Explicitly unsafe CSS properties:
// position [position:fixed enables overlay attacks], ...
// Data to use while walking the tree
var tw, itemOptions, targetElementID, destDoc, srcDoc;
var setOnClickArray = [];
function nodeFilter( node ) {
// if (node.nodeType == node.ELEMENT_NODE) alert("element node! " + node.tagName);
// else if (node.nodeType == node.TEXT_NODE) alert("text node! " + node.nodeValue);
// else alert("unknown node type!");
return NodeFilter.FILTER_ACCEPT;
}
function consoleLog( level, message ) {
if ( ( window.console ) && ( itemOptions.debugLevel >= level ) ) {
console.log( "jSanity: " + message );
}
}
function createWalkerJob( contextNode, ns, destElt ) {
return function walkerJob() {
var savedCurrentNode = tw.currentNode;
tw.currentNode = contextNode;
treeWalk( ns, destElt );
tw.currentNode = savedCurrentNode;
}
}
function scheduleNewWalkerJob( contextNode, ns, destElt ) {
var job = createWalkerJob( contextNode, ns, destElt );
sch.addNewJob( job );
}
function treeWalk( ns, destElt ) {
var savedCurrentNode, cElt, tagN, oldNS, killElt, validatedProtocol, fullPrefix, output, outAttribute, attN;
savedCurrentNode = tw.currentNode;
var nodesToRemove = new Array();
var setOnclick;
var modifiedProperty;
var childStyle;
for ( var child = tw.firstChild(); child !== null; child = tw.nextSibling() ) {
switch ( child.nodeType ) {
case child.ELEMENT_NODE:
// Operate on elements that are known (allow-listed) for the current namespace
tagN = child.tagName.toLowerCase();
if ( tagN in knownHTML[ ns ].knownElements ) {
// Preserve the current namespace as it may change for the element we are about to traverse
oldNS = ns;
// It may not be explicitly specified in the markup, but SVG elements have their own namespace
if ( tagN === "svg" ) {
ns = "http://www.w3.org/2000/svg";
}
// Create a new element appropriately in the destination document
if ( !itemOptions.directModifySource ) {
if ( ns == "default" ) {
cElt = destDoc.createElement( tagN );
} else {
cElt = destDoc.createElementNS( ns, tagN );
}
} else {
cElt = child;
}
// Flag to cancel adding this element into the DOM
killElt = false;
if ( !itemOptions.allowAudioVideo && ( ( tagN === "video" ) || ( tagN === "audio" ) || ( tagN === "source" ) ) ) {
killElt = true;
}
if ( tagN === "style" && !itemOptions.allowStylesheetsOnDirectModifySource ) {
// In directModifySource mode the style element actually makes it through. For now let's just explicitly kill it.
killElt = true;
// if (cElt.sheet !== null) {
// Unfortunately on Chrome and FF, document.implementation.createHTMLDocument does not
// create CSSStyleSheet objects. Hopefully this will change in the future.
// And in IE, while we can get cElt.sheet.cssRules, it is empty
// This is not a problem if we attempt to pull the stylesheet from the srcDoc as a whole
// See code at the bottom of the main sanitization loop (outside of the treeWalk)
// }
}
if ( !killElt ) {
setOnclick = null;
for ( var i = 0; i < child.attributes.length; i++ ) {
// var tempString1 = tagN + ": ";
// for (var j = 0; j < child.attributes.length; j++) {
// tempString1 += child.attributes[j].name + ", ";
// }
// alert(tempString1);
// Handle known attributes
attN = child.attributes[ i ].name.toLowerCase();
if ( attN in knownHTML[ ns ].knownAttributes ) {
// Link handling
if ( attN === "href" ) {