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@@ -52,6 +52,31 @@ jQuery.PrivateBin = (function($, RawDeflate) {
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*/
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let z;
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+ /**
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+ * DOMpurify settings for HTML content
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+ *
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+ * @private
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+ */
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+ const purifyHtmlConfig = {
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+ ALLOWED_URI_REGEXP: /^(?:(?:(?:f|ht)tps?|mailto|magnet):)/i,
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+ SAFE_FOR_JQUERY: true,
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+ USE_PROFILES: {
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+ html: true
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+ }
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+ };
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+
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+ /**
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+ * DOMpurify settings for SVG content
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+ *
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+ * @private
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+ */
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+ const purifySvgConfig = {
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+ USE_PROFILES: {
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+ svg: true,
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+ svgFilters: true
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+ }
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+ };
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+
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/**
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* CryptoData class
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*
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@@ -409,7 +434,8 @@ jQuery.PrivateBin = (function($, RawDeflate) {
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element.html().replace(
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/(((https?|ftp):\/\/[\w?!=&.\/-;#@~%+*-]+(?![\w\s?!&.\/;#~%"=-]>))|((magnet):[\w?=&.\/-;#@~%+*-]+))/ig,
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'<a href="$1" rel="nofollow noopener noreferrer">$1</a>'
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- )
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+ ),
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+ purifyHtmlConfig
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)
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);
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};
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@@ -2536,7 +2562,8 @@ jQuery.PrivateBin = (function($, RawDeflate) {
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// let showdown convert the HTML and sanitize HTML *afterwards*!
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$plainText.html(
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DOMPurify.sanitize(
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- converter.makeHtml(text)
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+ converter.makeHtml(text),
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+ purifyHtmlConfig
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)
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);
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// add table classes from bootstrap css
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@@ -2752,6 +2779,34 @@ jQuery.PrivateBin = (function($, RawDeflate) {
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$dropzone;
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/**
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+ * get blob URL from string data and mime type
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+ *
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+ * @name AttachmentViewer.getBlobUrl
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+ * @private
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+ * @function
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+ * @param {string} data - raw data of attachment
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+ * @param {string} data - mime type of attachment
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+ * @return {string} objectURL
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+ */
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+ function getBlobUrl(data, mimeType)
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+ {
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+ // Transform into a Blob
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+ const buf = new Uint8Array(data.length);
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+ for (let i = 0; i < data.length; ++i) {
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+ buf[i] = data.charCodeAt(i);
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+ }
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+ const blob = new window.Blob(
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+ [buf],
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+ {
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+ type: mimeType
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+ }
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+ );
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+
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+ // Get Blob URL
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+ return window.URL.createObjectURL(blob);
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+ }
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+
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+ /**
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* sets the attachment but does not yet show it
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*
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* @name AttachmentViewer.setAttachment
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@@ -2761,44 +2816,39 @@ jQuery.PrivateBin = (function($, RawDeflate) {
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*/
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me.setAttachment = function(attachmentData, fileName)
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{
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- // data URI format: data:[<mediaType>][;base64],<data>
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+ // data URI format: data:[<mimeType>][;base64],<data>
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// position in data URI string of where data begins
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const base64Start = attachmentData.indexOf(',') + 1;
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- // position in data URI string of where mediaType ends
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- const mediaTypeEnd = attachmentData.indexOf(';');
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+ // position in data URI string of where mimeType ends
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+ const mimeTypeEnd = attachmentData.indexOf(';');
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- // extract mediaType
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- const mediaType = attachmentData.substring(5, mediaTypeEnd);
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+ // extract mimeType
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+ const mimeType = attachmentData.substring(5, mimeTypeEnd);
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// extract data and convert to binary
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const rawData = attachmentData.substring(base64Start);
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const decodedData = rawData.length > 0 ? atob(rawData) : '';
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- // Transform into a Blob
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- const buf = new Uint8Array(decodedData.length);
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- for (let i = 0; i < decodedData.length; ++i) {
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- buf[i] = decodedData.charCodeAt(i);
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- }
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- const blob = new window.Blob([ buf ], { type: mediaType });
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-
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- // Get Blob URL
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- const blobUrl = window.URL.createObjectURL(blob);
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-
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- // IE does not support setting a data URI on an a element
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- // Using msSaveBlob to download
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- if (window.Blob && navigator.msSaveBlob) {
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- $attachmentLink.off('click').on('click', function () {
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- navigator.msSaveBlob(blob, fileName);
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- });
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- } else {
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- $attachmentLink.attr('href', blobUrl);
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- }
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+ let blobUrl = getBlobUrl(decodedData, mimeType);
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+ $attachmentLink.attr('href', blobUrl);
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if (typeof fileName !== 'undefined') {
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$attachmentLink.attr('download', fileName);
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}
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- me.handleBlobAttachmentPreview($attachmentPreview, blobUrl, mediaType);
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+ // sanitize SVG preview
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+ // prevents executing embedded scripts when CSP is not set and user
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+ // right-clicks/long-taps and opens the SVG in a new tab - prevented
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+ // in the preview by use of an img tag, which disables scripts, too
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+ if (mimeType.match(/image\/svg/i)) {
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+ const sanitizedData = DOMPurify.sanitize(
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+ decodedData,
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+ purifySvgConfig
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+ );
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+ blobUrl = getBlobUrl(sanitizedData, mimeType);
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+ }
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+
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+ me.handleBlobAttachmentPreview($attachmentPreview, blobUrl, mimeType);
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};
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/**
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@@ -3665,7 +3715,14 @@ jQuery.PrivateBin = (function($, RawDeflate) {
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for (let i = 0; i < $head.length; ++i) {
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newDoc.write($head[i].outerHTML);
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}
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- newDoc.write('</head><body><pre>' + DOMPurify.sanitize(Helper.htmlEntities(paste)) + '</pre></body></html>');
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+ newDoc.write(
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+ '</head><body><pre>' +
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+ DOMPurify.sanitize(
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+ Helper.htmlEntities(paste),
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+ purifyHtmlConfig
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+ ) +
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+ '</pre></body></html>'
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+ );
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newDoc.close();
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}
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@@ -5394,11 +5451,6 @@ jQuery.PrivateBin = (function($, RawDeflate) {
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// first load translations
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I18n.loadTranslations();
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- DOMPurify.setConfig({
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- ALLOWED_URI_REGEXP: /^(?:(?:(?:f|ht)tps?|mailto|magnet):)/i,
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- SAFE_FOR_JQUERY: true
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- });
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-
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// Add a hook to make all links open a new window
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DOMPurify.addHook('afterSanitizeAttributes', function(node) {
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// set all elements owning target to target=_blank
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El RIDO