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 (@) { #{{{
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
# 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
+ 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;
} # }}}