XSS and Reduced Markdown for Admin (#355)

admin/package.json

@@ -106,7 +106,7 @@
     "webpack-cli": "^3.1.0",
     "webpack-dev-server": "3.2.1",
     "webpack-hot-middleware": "^2.24.0",
-    "xss": "1.0.3"
+    "xss": "^1.0.3"
   },
   "devDependencies": {
     "@types/bn.js": "4.11.1",

admin/src/components/Markdown/index.tsx

@@ -5,12 +5,13 @@ import './index.less';
 
 interface Props extends React.HTMLAttributes<HTMLDivElement> {
   source: string;
+  reduced?: boolean;
 }
 
 export default class Markdown extends React.PureComponent<Props> {
   render() {
-    const { source, ...rest } = this.props;
-    const html = mdToHtml(source);
+    const { source, reduced, ...rest } = this.props;
+    const html = mdToHtml(source, reduced);
     // TS types seem to be fighting over react prop defs for div
     const divProps = rest as any;
     return (

admin/src/components/Moderation/ModerationItem.tsx

@@ -54,7 +54,7 @@ class ModerationItem extends React.Component<Comment> {
           }
           description={
             <ShowMore height={100}>
-              <Markdown source={p.content} />
+              <Markdown source={p.content} reduced />
             </ShowMore>
           }
         />

admin/src/components/UserDetail/index.tsx

@@ -270,7 +270,11 @@ class UserDetailNaked extends React.Component<Props, State> {
                               </Link>{' '}
                               at {formatDateMs(c.dateCreated)}
                             </div>
-                            <Markdown source={c.content} className="UserDetail-comment" />
+                            <Markdown
+                              source={c.content}
+                              reduced
+                              className="UserDetail-comment"
+                            />
                           </>
                         }
                       />

admin/src/util/md.ts

@@ -1,4 +1,5 @@
 import Showdown from 'showdown';
+import xss from 'xss';
 
 const showdownConverter = new Showdown.Converter({
   simplifiedAutoLink: true,
@@ -9,6 +10,41 @@ const showdownConverter = new Showdown.Converter({
   excludeTrailingPunctuationFromURLs: true,
 });
 
-export const mdToHtml = (text: string) => {
-  return showdownConverter.makeHtml(text);
+export const mdToHtml = (text: string, reduced: boolean = false) => {
+  const html = showdownConverter.makeHtml(text);
+  return reduced ? xss(html, reducedXssOpts) : xss(html);
+};
+
+const reducedXssOpts = {
+  stripIgnoreTag: true,
+  whiteList: {
+    a: ['target', 'href', 'title'],
+    b: [],
+    blockquote: [],
+    br: [],
+    code: [],
+    del: [],
+    em: [],
+    h4: [],
+    h5: [],
+    h6: [],
+    hr: [],
+    i: [],
+    li: [],
+    ol: [],
+    p: [],
+    pre: [],
+    small: [],
+    sub: [],
+    sup: [],
+    strong: [],
+    table: ['width', 'border', 'align', 'valign'],
+    tbody: ['align', 'valign'],
+    td: ['width', 'rowspan', 'colspan', 'align', 'valign'],
+    tfoot: ['align', 'valign'],
+    th: ['width', 'rowspan', 'colspan', 'align', 'valign'],
+    thead: ['align', 'valign'],
+    tr: ['rowspan', 'align', 'valign'],
+    ul: [],
+  },
 };

admin/yarn.lock

@@ -8477,9 +8477,10 @@ xregexp@4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/xregexp/-/xregexp-4.0.0.tgz#e698189de49dd2a18cc5687b05e17c8e43943020"
 
-xss@1.0.3:
+xss@^1.0.3:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/xss/-/xss-1.0.3.tgz#d04bd2558fd6c29c46113824d5e8b2a910054e23"
+  integrity sha512-LTpz3jXPLUphMMmyufoZRSKnqMj41OVypZ8uYGzvjkMV9C1EdACrhQl/EM8Qfh5htSAuMIQFOejmKAZGkJfaCg==
   dependencies:
     commander "^2.9.0"
     cssfilter "0.0.10"

backend/grant/email/send.py

@@ -385,6 +385,8 @@ def make_envelope(to, type, email_args):
 
 
 def sendgrid_send(mail):
+    to = mail.___to
+    type = mail.___type
     try:
         sg = sendgrid.SendGridAPIClient(apikey=SENDGRID_API_KEY)
         res = sg.client.mail.send.post(request_body=mail.get())