# HG changeset patch
# User Matthew Wild <mwild1@gmail.com>
# Date 1744975506 -3600
# Node ID 0b01f40df0f9341b0ea8c6ba9fb84df7cc34d134
# Parent  ce4b4c2863f3e460ddd965359326b83115176760
mod_http_file_share: Add media-src 'self' to Content-Security-Policy header

This allows certain media files to be loaded when navigated to directly in a
web browser.

Note that in some browsers (Chrome), the media gets transformed
internally into a HTML page with some basic styles, but these are blocked due
to our default-src policy of 'none' Although this could be unblocked with
style-src unsafe-inline, it is not our plan to fix this, because this would
have negative security implications.

The reason for our CSP is to prevent the file share service from being used to
host malicious HTML/CSS/JS. Yes, CSS can be malicious.

Our file share service is for uploading and downloading files, it is not a
substitute for website/content hosting.

diff -r ce4b4c2863f3 -r 0b01f40df0f9 plugins/mod_http_file_share.lua
--- a/plugins/mod_http_file_share.lua	Wed Apr 16 15:35:07 2025 +0200
+++ b/plugins/mod_http_file_share.lua	Fri Apr 18 12:25:06 2025 +0100
@@ -469,7 +469,7 @@
 	response.headers.accept_ranges = "bytes";
 
 	response.headers.cache_control = "max-age=31556952, immutable";
-	response.headers.content_security_policy =  "default-src 'none'; frame-ancestors 'none';"
+	response.headers.content_security_policy =  "default-src 'none'; media-src 'self'; frame-ancestors 'none';"
 	response.headers.strict_transport_security = "max-age=31556952";
 	response.headers.x_content_type_options = "nosniff";
 	response.headers.x_frame_options = "DENY"; -- COMPAT IE missing support for CSP frame-ancestors