prosody-modules
8488ebde5739
mod_xhtmlim/mod_xhtmlim.lua

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mod_xhtmlim/mod_xhtmlim.lua @ 5738:8488ebde5739

mod_http_oauth2: Skip consent screen if requested by client and same scopes already granted This follows the intent behind the OpenID Connect 'prompt' parameter when it does not include the 'consent' keyword, that is the client wishes to skip the consent screen. If the user has already granted the exact same scopes to the exact same client in the past, then one can assume that they may grant it again.
author Kim Alvefur <zash@zash.se>
date Tue, 14 Nov 2023 23:03:37 +0100
parent 3699:1f68287138e3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2865
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
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parents:
diff changeset
1 -- XEP-0071: XHTML-IM sanitizing
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
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parents:
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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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parents:
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6 local url = require "socket.url";
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7
3699
1f68287138e3 mod_xhtmlim: Default to stripping @style attribute by default
Kim Alvefur <zash@zash.se>
parents: 3404
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8 local no_styles = module:get_option_boolean("strip_xhtml_style", true);
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9
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
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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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parents:
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15 <title/>
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parents:
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16 <abbr/> class, id, title; style
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parents:
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17 <acronym/> class, id, title; style
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parents:
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18 <address/> class, id, title; style
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parents:
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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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parents:
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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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276f7af8afd1 mod_xhtmlim: Fix scheme check (thanks wiktor)
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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
3404
6444fb5dbb51 mod_xhtmlim: Turn unknown elements into <span>
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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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parents:
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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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parents:
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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;
f6ed4421167d mod_xhtmlim: Attempts to sanitize XMTML-IM messages
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111 else -- catch
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parents:
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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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parents:
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121 module:hook("pre-message/bare", message_handler, 71);
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parents:
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122 module:hook("pre-message/full", message_handler, 71);
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parents:
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123 module:hook("pre-message/host", message_handler, 71);
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parents:
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124
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parents:
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125 -- Stanzas about to be delivered to clients
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parents:
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126 module:hook("message/bare", message_handler, 71);
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parents:
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127 module:hook("message/full", message_handler, 71);