annotate mod_xhtmlim/mod_xhtmlim.lua @ 3699:1f68287138e3

mod_xhtmlim: Default to stripping @style attribute by default Proper sanitation would require a CSS parser, easier and probably best for everyone to just strip by default.
author Kim Alvefur <zash@zash.se>
date Tue, 08 Oct 2019 18:35:48 +0200
parents 6444fb5dbb51
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2865
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1 -- XEP-0071: XHTML-IM sanitizing
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2
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3 local assert = assert;
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4
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5 local st = require "util.stanza";
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6 local url = require "socket.url";
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7
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1f68287138e3 mod_xhtmlim: Default to stripping @style attribute by default
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8 local no_styles = module:get_option_boolean("strip_xhtml_style", true);
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9
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10 -- Tables from XEP-0071
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11 local xeptables = [[
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12 <body/> class, id, title; style
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13 <head/> profile
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14 <html/> version
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15 <title/>
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16 <abbr/> class, id, title; style
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17 <acronym/> class, id, title; style
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18 <address/> class, id, title; style
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19 <blockquote/> class, id, title; style; cite
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20 <br/> class, id, title; style
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21 <cite/> class, id, title; style
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22 <code/> class, id, title; style
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23 <dfn/> class, id, title; style
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24 <div/> class, id, title; style
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25 <em/> class, id, title; style
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26 <h1/> class, id, title; style
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27 <h2/> class, id, title; style
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28 <h3/> class, id, title; style
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29 <h4/> class, id, title; style
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30 <h5/> class, id, title; style
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31 <h6/> class, id, title; style
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32 <kbd/> class, id, title; style
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33 <p/> class, id, title; style
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34 <pre/> class, id, title; style
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35 <q/> class, id, title; style; cite
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36 <samp/> class, id, title; style
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37 <span/> class, id, title; style
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38 <strong/> class, id, title; style
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39 <var/> class, id, title; style
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40 <a/> class, id, title; style; accesskey, charset, href, hreflang, rel, rev, tabindex, type
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41 <dl/> class, id, title; style
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42 <dt/> class, id, title; style
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43 <dd/> class, id, title; style
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44 <ol/> class, id, title; style
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45 <ul/> class, id, title; style
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46 <li/> class, id, title; style
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47 <img/> class, id, title; style; alt, height, longdesc, src, width
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48 ]];
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49
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50 -- map of whitelisted tag names to set of allowed attributes
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51 local tags = {}; -- { string : { string : boolean } }
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52
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53 for tag, attrs in xeptables:gmatch("<(%w+)/>([^\n]*)") do
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54 tags[tag] = { xmlns = true, ["xml:lang"] = true };
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55 for attr in attrs:gmatch("%w+") do
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56 tags[tag][attr] = true;
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57 end
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58 if no_styles then
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59 tags[tag]["style"] = nil;
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60 end
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61 end
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62
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63 -- module:log("debug", "tags = %s;", require "util.serialization".serialize(tags));
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64
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65 -- TODO Decide if disallowed tags should be bounced or silently discarded.
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66 -- XEP says "ignore" and replace tag with text content, but that would
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67 -- need a different transform which can't use `maptags`.
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68 if not module:get_option_boolean("bounce_invalid_xhtml", false) then
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69 assert = function (x) return x end
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70 end
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71
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72 local function sanitize_xhtml(tag)
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73 -- module:log("debug", "sanitize_xhtml(<{%s}%s>)", tag.attr.xmlns, tag.name);
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74 if tag.attr.xmlns == "http://www.w3.org/1999/xhtml" then
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75 local allowed = assert(tags[tag.name], tag.name);
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76 if allowed then
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77 for attr, value in pairs(tag.attr) do
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78 if not allowed[attr] then
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79 -- module:log("debug", "Removing disallowed attribute %q from <%s>", attr, tag.name);
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80 tag.attr[attr] = nil;
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81 elseif attr == "src" or attr == "href" then
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82 local urlattr = url.parse(value);
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83 local scheme = urlattr and urlattr.scheme;
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84 if scheme ~= "http" and scheme ~= "https" and scheme ~= "mailto" and scheme ~= "xmpp" and scheme ~= "cid" then
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85 tag.attr[attr] = "https://url.was.invalid/";
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86 end
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87 end
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88 end
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89 else
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90 tag.name = "span"
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91 tag.attr = { xmlns = "http://www.w3.org/1999/xhtml" }
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92 end
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93 -- Check child tags
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94 tag:maptags(sanitize_xhtml);
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95 -- This tag is clean!
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96 return tag;
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97 end
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98 -- Not xhtml, probably best to discard it
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99 return nil;
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100 end
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101
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102 -- Check for xhtml-im, sanitize if exists
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103 local function message_handler(event)
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104 local stanza = event.stanza;
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105 if stanza:get_child("html", "http://jabber.org/protocol/xhtml-im") then
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106 stanza = st.clone(stanza);
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107 if pcall(function() -- try
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108 stanza:get_child("html", "http://jabber.org/protocol/xhtml-im"):maptags(sanitize_xhtml);
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109 end) then
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110 event.stanza = stanza;
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111 else -- catch
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112 if stanza.attr.type ~= "error" then
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113 event.origin.send(st.error_reply(stanza, "modify", "not-acceptable", "Stanza contained illegal XHTML-IM tag"));
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114 end
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115 return true;
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116 end
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117 end
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118 end
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119
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120 -- Stanzas received from clients
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121 module:hook("pre-message/bare", message_handler, 71);
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122 module:hook("pre-message/full", message_handler, 71);
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123 module:hook("pre-message/host", message_handler, 71);
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124
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125 -- Stanzas about to be delivered to clients
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126 module:hook("message/bare", message_handler, 71);
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127 module:hook("message/full", message_handler, 71);