formatting etc

[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;
 
 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);
 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 (@) { #{{{
 } # }}}
 
 sub sanitize (@) { #{{{


@@ -17,7 +42,7 @@ sub sanitize (@) { #{{{
 my $_scrubber;
 sub scrubber { #{{{
        return $_scrubber if defined $_scrubber;
 my $_scrubber;
 sub scrubber { #{{{
        return $_scrubber if defined $_scrubber;

-       
+

        eval q{use HTML::Scrubber};
        error($@) if $@;
        # Lists based on http://feedparser.org/docs/html-sanitization.html
        eval q{use HTML::Scrubber};
        error($@) if $@;
        # Lists based on http://feedparser.org/docs/html-sanitization.html


@@ -35,23 +60,30 @@ sub scrubber { #{{{
                }],
                default => [undef, { (
                        map { $_ => 1 } qw{
                }],
                default => [undef, { (
                        map { $_ => 1 } qw{

-                               abbr accept accept-charset accesskey action
+                               abbr accept accept-charset accesskey

                                align alt axis border cellpadding cellspacing
                                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
                                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
                                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
                                value vspace width

-                               poster autoplay loopstart loopend end
+                               autoplay loopstart loopend end

                                playcount controls 
                        } ),
                        "/" => 1, # emit proper <hr /> XHTML
                                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;
 } # }}}
        );
        return $_scrubber;
 } # }}}