prosody-modules
8bfcedd93a72
mod_xhtmlim/mod_xhtmlim.lua

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mod_xhtmlim/mod_xhtmlim.lua @ 5551:8bfcedd93a72

mod_rest: List all error conditions in OpenAPI spec These are not handled by datamanager but by util.stanza and util.error, so they are not represented in the JSON schema file.
author Kim Alvefur <zash@zash.se>
date Sat, 17 Jun 2023 16:26:33 +0200
parent 3699:1f68287138e3
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
2865
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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);