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From: schwarze@mandoc.bsd.lv
To: source@mandoc.bsd.lv
Subject: cvsweb: For defense-in-depth against XSS attacks, add a
Date: Thu, 7 Nov 2019 17:58:48 -0500 (EST)	[thread overview]
Message-ID: <8d0763a6a67c8b1a@mandoc.bsd.lv> (raw)

Log Message:
-----------
For defense-in-depth against XSS attacks, add a Content-Security-Policy
Response header as a second layer mitigation.  Basic idea suggested
by sthen@.

Tags:
----
FreeBSD-cvsweb-2_0-branch

Modified Files:
--------------
    cvsweb:
        cvsweb.cgi

Revision Data
-------------
Index: cvsweb.cgi
===================================================================
RCS file: /home/cvs/mandoc/cvsweb/cvsweb.cgi,v
retrieving revision 3.119.2.22
retrieving revision 3.119.2.23
diff -Lcvsweb.cgi -Lcvsweb.cgi -u -p -r3.119.2.22 -r3.119.2.23
--- cvsweb.cgi
+++ cvsweb.cgi
@@ -3558,8 +3558,14 @@ sub http_header(;$) {
 
 	if ($is_mod_perl) {
 		Apache->request->content_type($content_type);
+		Apache->request->header_out("Content-Security-Policy" =>
+		    "default-src 'none'; image-src 'self'; " .
+		    "style-src 'self' 'unsafe-inline'");
 	} else {
 		print "Content-Type: $content_type\r\n";
+		print "Content-Security-Policy: ",
+		    "default-src 'none'; image-src 'self'; ",
+		    "style-src 'self' 'unsafe-inline';\r\n";
 	}
 
 	if ($allow_compress && $maycompress) {
--
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                 reply	other threads:[~2019-11-07 22:58 UTC|newest]

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