Skip to content
This repository was archived by the owner on Jul 22, 2025. It is now read-only.

FIX: Ensure artifacts are sandboxed, even when visited directly #921

Merged
merged 1 commit into from
Nov 19, 2024
Merged

FIX: Ensure artifacts are sandboxed, even when visited directly #921

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
28 changes: 25 additions & 3 deletions app/controllers/discourse_ai/ai_bot/artifacts_controller.rb
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -19,8 +19,8 @@ def show
raise Discourse::NotFound if !guardian.can_see?(post)
end

# Prepare the HTML document
html = <<~HTML
# Prepare the inner (untrusted) HTML document
untrusted_html = <<~HTML
<!DOCTYPE html>
<html>
<head>
Expand All @@ -39,11 +39,33 @@ def show
</html>
HTML

# Prepare the outer (trusted) HTML document
trusted_html = <<~HTML
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>#{ERB::Util.html_escape(artifact.name)}</title>
<style>
html, body, iframe {
margin: 0;
padding: 0;
width: 100%;
height: 100%;
}
</style>
</head>
<body>
<iframe sandbox="allow-scripts allow-forms" height="100%" width="100%" srcdoc="#{ERB::Util.html_escape(untrusted_html)}" frameborder="0"></iframe>
</body>
</html>
HTML

response.headers.delete("X-Frame-Options")
response.headers["Content-Security-Policy"] = "script-src 'unsafe-inline';"

# Render the content
render html: html.html_safe, layout: false, content_type: "text/html"
render html: trusted_html.html_safe, layout: false, content_type: "text/html"
end

private
Expand Down
13 changes: 9 additions & 4 deletions spec/requests/ai_bot/artifacts_controller_spec.rb
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,10 @@
)
end

def parse_srcdoc(html)
Nokogiri.HTML5(html).at_css("iframe")["srcdoc"]
end

before do
SiteSetting.discourse_ai_enabled = true
SiteSetting.ai_artifact_security = "strict"
Expand Down Expand Up @@ -46,9 +50,10 @@
sign_in(user)
get "/discourse-ai/ai-bot/artifacts/#{artifact.id}"
expect(response.status).to eq(200)
expect(response.body).to include(artifact.html)
expect(response.body).to include(artifact.css)
expect(response.body).to include(artifact.js)
untrusted_html = parse_srcdoc(response.body)
expect(untrusted_html).to include(artifact.html)
expect(untrusted_html).to include(artifact.css)
expect(untrusted_html).to include(artifact.js)
end
end

Expand All @@ -58,7 +63,7 @@
it "shows artifact without authentication" do
get "/discourse-ai/ai-bot/artifacts/#{artifact.id}"
expect(response.status).to eq(200)
expect(response.body).to include(artifact.html)
expect(parse_srcdoc(response.body)).to include(artifact.html)
end
end

Expand Down