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Gek/disable remote images (#800)

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* Disable images from anywhere but our emojis. Closes #756

* Add tests around images in chat messages

* Update sanitizer + test
This commit is contained in:
Gabe Kangas
2021-03-08 23:20:15 -08:00
committed by GitHub
parent 319b6ebe11
commit de195f883e
2 changed files with 30 additions and 15 deletions
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27
core/chat/messageRendering_test.go
View File

@ -15,7 +15,7 @@ func TestRenderAndSanitize(t *testing.T) {
## blah blah blah
[test link](http://owncast.online)
<img class="emoji" alt="bananadance.gif" width="600px" src="https://goth.land/img/emoji/bananadance.gif">
<img class="emoji" alt="bananadance.gif" width="600px" src="/img/emoji/bananadance.gif">
<script src="http://hackers.org/hack.js"></script>
`
@ -23,11 +23,32 @@ func TestRenderAndSanitize(t *testing.T) {
Here is an iframe </p>
blah blah blah
<p><a href="http://owncast.online" rel="nofollow noreferrer noopener" target="_blank">test link</a>
<img class="emoji" alt="bananadance.gif" src="https://goth.land/img/emoji/bananadance.gif"></p>`
<img class="emoji" src="/img/emoji/bananadance.gif"></p>`
result := models.RenderAndSanitize(messageContent)
if result != expected {
t.Errorf("message rendering/sanitation does not match expected. Got\n%s, \n\n want:\n%s", result, expected)
}
}
// Test to make sure we block remote images in chat messages.
func TestBlockRemoteImages(t *testing.T) {
messageContent := `<img src="https://via.placeholder.com/350x150"> test ![](https://via.placeholder.com/350x150)`
expected := `<p> test </p>`
result := models.RenderAndSanitize(messageContent)
if result != expected {
t.Errorf("message rendering/sanitation does not match expected. Got\n%s, \n\n want:\n%s", result, expected)
}
}
// Test to make sure emoji images are allowed in chat messages.
func TestAllowEmojiImages(t *testing.T) {
messageContent := `<img src="/img/emoji/beerparrot.gif"> test ![](/img/emoji/beerparrot.gif)`
expected := `<p><img src="/img/emoji/beerparrot.gif"> test <img src="/img/emoji/beerparrot.gif"></p>`
result := models.RenderAndSanitize(messageContent)
if result != expected {
t.Errorf("message rendering/sanitation does not match expected. Got\n%s, \n\n want:\n%s", result, expected)
}
}

18
models/chatMessage.go
View File

@ -2,6 +2,7 @@ package models
import (
"bytes"
"regexp"
"strings"
"time"
@ -96,6 +97,7 @@ func sanitize(raw string) string {
// Require URLs to be parseable by net/url.Parse
p.AllowStandardURLs()
p.RequireParseableURLs(true)
// Allow links
p.AllowAttrs("href").OnElements("a")
@ -106,19 +108,11 @@ func sanitize(raw string) string {
// Links will get target="_blank" added to them.
p.AddTargetBlankToFullyQualifiedLinks(true)
// Allow paragraphs
p.AllowElements("br")
p.AllowElements("p")
// Allow breaks
p.AllowElements("br", "p")
// Allow img tags
p.AllowElements("img")
p.AllowAttrs("src").OnElements("img")
p.AllowAttrs("alt").OnElements("img")
p.AllowAttrs("title").OnElements("img")
// Custom emoji have a class already specified.
// We should only allow classes on emoji, not *all* imgs.
// But TODO.
// Allow img tags from the the local emoji directory only
p.AllowAttrs("src", "alt", "class", "title").Matching(regexp.MustCompile(`(?i)/img/emoji`)).OnElements("img")
p.AllowAttrs("class").OnElements("img")
// Allow bold