really add

[git.ikiwiki.info.git] / IkiWiki / Plugin / htmlscrubber.pm

diff --git a/IkiWiki/Plugin/htmlscrubber.pm b/IkiWiki/Plugin/htmlscrubber.pm
index bc613f92477ef55ef384f8a1bbf2887670c0e7a7..3bdaccea119ec0e1b289a0da2f6d90e2219b8d66 100644 (file)
--- a/IkiWiki/Plugin/htmlscrubber.pm
+++ b/IkiWiki/Plugin/htmlscrubber.pm
@@ -5,8 +5,33 @@ use warnings;
 use strict;
 use IkiWiki 2.00;
 
+# This regexp matches urls that are in a known safe scheme.
+# Feel free to use it from other plugins.
+our $safe_url_regexp;
+
 sub import { #{{{
        hook(type => "sanitize", id => "htmlscrubber", call => \&sanitize);
+
+       # 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("|", map quotemeta,
+               # 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",
+               # Selected unofficial schemes
+               "aim", "callto", "cvs", "ed2k", "feed", "fish", "gg",
+               "irc", "ircs", "lastfm", "ldaps", "magnet", "mms",
+               "msnim", "notes", "rsync", "secondlife", "skype", "ssh",
+               "sftp", "smb", "sms", "snews", "webcal", "ymsgr",
+       );
+       # data is a special case. Allow data:image/*, but
+       # disallow data:text/javascript and everything else.
+       $safe_url_regexp=qr/^(?:(?:$uri_schemes):|data:image\/|[^:]+(?:$|\/))/i;
 } # }}}
 
 sub sanitize (@) { #{{{
@@ -17,7 +42,7 @@ sub sanitize (@) { #{{{
 my $_scrubber;
 sub scrubber { #{{{
        return $_scrubber if defined $_scrubber;
-       
+
        eval q{use HTML::Scrubber};
        error($@) if $@;
        # Lists based on http://feedparser.org/docs/html-sanitization.html
@@ -35,23 +60,30 @@ sub scrubber { #{{{
                }],
                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
+                               char charoff charset checked class
                                clear cols colspan color compact coords
                                datetime dir disabled enctype for frame
-                               headers height href hreflang hspace id ismap
-                               label lang longdesc maxlength media method
+                               headers height hreflang hspace id ismap
+                               label lang maxlength media method
                                multiple name nohref noshade nowrap prompt
                                readonly rel rev rows rowspan rules scope
-                               selected shape size span src start summary
-                               tabindex target title type usemap valign
+                               selected shape size span start summary
+                               tabindex target title type valign
                                value vspace width
-                               poster autoplay loopstart loopend end
+                               autoplay loopstart loopend end
                                playcount controls 
                        } ),
                        "/" => 1, # emit proper <hr /> XHTML
-                       }],
+                       href => $safe_url_regexp,
+                       src => $safe_url_regexp,
+                       action => $safe_url_regexp,
+                       cite => $safe_url_regexp,
+                       longdesc => $safe_url_regexp,
+                       poster => $safe_url_regexp,
+                       usemap => $safe_url_regexp,
+               }],
        );
        return $_scrubber;
 } # }}}