X-Git-Url: https://sipb.mit.edu/gitweb.cgi/ikiwiki.git/blobdiff_plain/9f1e4994963d489fbc409555b4cfda33383cfe74..d7e0c035e55e8b47a9ea7e993c9332a7ce9930e1:/IkiWiki/Plugin/htmlscrubber.pm

diff --git a/IkiWiki/Plugin/htmlscrubber.pm b/IkiWiki/Plugin/htmlscrubber.pm
index 4245c879c..25caa8a50 100644
--- a/IkiWiki/Plugin/htmlscrubber.pm
+++ b/IkiWiki/Plugin/htmlscrubber.pm
@@ -18,40 +18,66 @@ my $_scrubber;
 sub scrubber { #{{{
 	return $_scrubber if defined $_scrubber;
 	
+	# Only known uri schemes are allowed to avoid all the ways of
+	# embedding javascrpt.
+	# List at http://en.wikipedia.org/wiki/URI_scheme
+	my $uri_schemes=join("|",
+		# IANA registered schemes
+		"http", "https", "ftp", "mailto", "file", "telnet", "gopher",
+		"aaa", "aaas", "acap", 	"cap", "cid", "crid", 
+		"dav", "dict", "dns", "fax", "go", "h323", "im", "imap",
+		"ldap", "mid", "news", "nfs", "nntp", "pop", "pres",
+		"sip", "sips", "snmp", "tel", "urn", "wais", "xmpp",
+		"z39.50r", "z39.50s",
+		# data is a special case. Allow data:text/<image>, but
+		# disallow data:text/javascript and everything else.
+		qr/data:text\/(?:png|gif|jpeg)/,
+		# Selected unofficial schemes
+		"about", "aim", "callto", "cvs", "ed2k", "feed", "fish", "gg",
+		"irc", "ircs", "lastfm", "ldaps", "magnet", "mms",
+		"msnim", "notes", "rsync", "secondlife", "skype", "ssh",
+		"sftp", "sms", "steam", "webcal", "ymsgr",
+	);
+	my $link=qr/^(?:$uri_schemes:|[^:]+$)/i;
+
 	eval q{use HTML::Scrubber};
 	error($@) if $@;
 	# Lists based on http://feedparser.org/docs/html-sanitization.html
 	# With html 5 video and audio tags added.
 	$_scrubber = HTML::Scrubber->new(
 		allow => [qw{
-			a abbr acronym address area b big blockquote br
+			a abbr acronym address area b big blockquote br br/
 			button caption center cite code col colgroup dd del
 			dfn dir div dl dt em fieldset font form h1 h2 h3 h4
-			h5 h6 hr i img input ins kbd label legend li map
-			menu ol optgroup option p pre q s samp select small
+			h5 h6 hr hr/ i img input ins kbd label legend li map
+			menu ol optgroup option p p/ pre q s samp select small
 			span strike strong sub sup table tbody td textarea
 			tfoot th thead tr tt u ul var
 			video audio
 		}],
 		default => [undef, { (
 			map { $_ => 1 } qw{
-				abbr accept accept-charset accesskey action
+				abbr accept accept-charset accesskey
 				align alt axis border cellpadding cellspacing
 				char charoff charset checked cite class
 				clear cols colspan color compact coords
 				datetime dir disabled enctype for frame
-				headers height href hreflang hspace id ismap
+				headers height hreflang hspace id ismap
 				label lang longdesc maxlength media method
 				multiple name nohref noshade nowrap prompt
 				readonly rel rev rows rowspan rules scope
-				selected shape size span src start summary
+				selected shape size span start summary
 				tabindex target title type usemap valign
 				value vspace width
-				poster autoplay loopstart loopend end
+				autoplay loopstart loopend end
 				playcount controls 
 			} ),
 			"/" => 1, # emit proper <hr /> XHTML
-			}],
+			href => $link,
+			src => $link,
+			action => $link,
+			poster => $link,
+		}],
 	);
 	return $_scrubber;
 } # }}}