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annotate mod_cloud_notify_encrypted/mod_cloud_notify_encrypted.lua @ 4651:8231774f5bfd

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mod_cloud_notify_encrypted: Ensure body substring remains valid UTF-8 The `body:sub()` call risks splitting the string in the middle of a multi-byte UTF-8 sequence. This should have been caught by util.stanza validation, but that would have caused some havoc, at the very least causing the notification to not be sent. There have been no reports of this happening. Likely because this module isn't widely deployed among users with languages that use many longer UTF-8 sequences. The util.encodings.utf8.valid() function is O(n) where only the last sequence really needs to be checked, but it's in C and expected to be fast.
author Kim Alvefur <zash@zash.se>
date Sun, 22 Aug 2021 13:22:59 +0200
parents 44af84178cea
children 62480053c87b
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1 local array = require "util.array";
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2 local base64 = require "util.encodings".base64;
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3 local valid_utf8 = require "util.encodings".utf8.valid;
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4 local ciphers = require "openssl.cipher";
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5 local jid = require "util.jid";
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6 local json = require "util.json";
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7 local random = require "util.random";
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8 local set = require "util.set";
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9 local st = require "util.stanza";
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10
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11 local xmlns_jmi = "urn:xmpp:jingle-message:0";
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12 local xmlns_jingle_apps_rtp = "urn:xmpp:jingle:apps:rtp:1";
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13 local xmlns_push = "urn:xmpp:push:0";
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14 local xmlns_push_encrypt = "tigase:push:encrypt:0";
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15 local xmlns_push_encrypt_aes_128_gcm = "tigase:push:encrypt:aes-128-gcm";
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16 local xmlns_push_jingle = "tigase:push:jingle:0";
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17
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18 local function detect_stanza_encryption(stanza)
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19 local eme = stanza:get_child("encryption", "urn:xmpp:eme:0");
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20 if eme then return eme.attr.namespace or ""; end
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21 -- Fallback for legacy OMEMO clients without EME
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22 local omemo = stanza:get_child("encrypted", "eu.siacs.conversations.axolotl");
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23 if omemo then return "eu.siacs.conversations.axolotl"; end
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24 end
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25
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26 -- https://xeps.tigase.net//docs/push-notifications/encrypt/#41-discovering-support
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27 local function account_disco_info(event)
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28 event.reply:tag("feature", {var=xmlns_push_encrypt}):up();
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29 event.reply:tag("feature", {var=xmlns_push_encrypt_aes_128_gcm}):up();
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30 event.reply:tag("feature", {var=xmlns_push_jingle}):up();
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31 end
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32 module:hook("account-disco-info", account_disco_info);
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33
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34 function handle_register(event)
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35 local encrypt = event.stanza:get_child("enable", xmlns_push):get_child("encrypt", xmlns_push_encrypt);
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36 if not encrypt then return; end
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37
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38 local algorithm = encrypt.attr.alg;
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39 if algorithm ~= "aes-128-gcm" then
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40 event.origin.send(st.error_reply(
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41 event.stanza, "modify", "feature-not-implemented", "Unknown encryption algorithm"
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42 ));
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43 return false;
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44 end
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45
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46 local key_base64 = encrypt:get_text();
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47 local key_binary = base64.decode(key_base64);
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48 if not key_binary or #key_binary ~= 16 then
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49 event.origin.send(st.error_reply(
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50 event.stanza, "modify", "bad-request", "Invalid encryption key"
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51 ));
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52 return false;
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53 end
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54
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55 event.push_info.encryption = {
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56 algorithm = algorithm;
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57 key_base64 = key_base64;
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58 };
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59 end
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60
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61 function handle_push(event)
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62 local encryption = event.push_info.encryption;
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63 if not encryption then return; end
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64
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65 if encryption.algorithm ~= "aes-128-gcm" then
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66 event.reason = "Unsupported encryption algorithm: "..tostring(encryption.algorithm);
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67 return true;
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68 end
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69
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70 local push_summary = event.push_summary;
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71
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72 local original_stanza = event.original_stanza;
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73 local is_encrypted_msg = detect_stanza_encryption(original_stanza);
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74 local body;
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75 if is_encrypted_msg then
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76 -- TODO: localization
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77 body = "You have received an encrypted message";
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78 else
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79 body = original_stanza:get_child_text("body");
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80 if body and #body > 255 then
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81 body = body:sub(1, 255);
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82 if not valid_utf8(body) then
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83 body = body:gsub("[\194-\244][\128-\191]*$", "");
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84 end
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85 end
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86 end
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87
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88 local push_payload = {
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89 unread = tonumber(push_summary["message-count"]) or 1;
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90 sender = jid.bare(original_stanza.attr.from);
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91 message = body;
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92 };
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93
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94 if original_stanza.name == "message" then
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95 if original_stanza.attr.type == "groupchat" then
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96 push_payload.type = "groupchat";
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97 push_payload.nickname = jid.resource(original_stanza.attr.from);
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98 elseif original_stanza.attr.type ~= "error" then
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99 local jmi_propose = original_stanza:get_child("propose", xmlns_jmi);
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100 if jmi_propose then
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101 push_payload.type = "call";
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102 push_payload.sid = jmi_propose.attr.id;
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103 local media_types = set.new();
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104 for description in jmi_propose:childtags("description", xmlns_jingle_apps_rtp) do
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105 local media_type = description.attr.media;
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106 if media_type then
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107 media_types:add(media_type);
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108 end
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109 end
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110 push_payload.media = array.collect(media_types:items());
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111 push_payload.sender = original_stanza.attr.from;
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112 else
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113 push_payload.type = "chat";
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114 end
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115 end
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116 elseif original_stanza.name == "presence"
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117 and original_stanza.attr.type == "subscribe" then
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118 push_payload.type = "subscribe";
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119 end
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120
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121 local iv = random.bytes(12);
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122 local key_binary = base64.decode(encryption.key_base64);
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123 local push_json = json.encode(push_payload);
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124
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125 -- FIXME: luaossl does not expose the EVP_CTRL_GCM_GET_TAG API, so we append 16 NUL bytes
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126 -- Siskin does not validate the tag anyway.
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127 local encrypted_payload = base64.encode(ciphers.new("AES-128-GCM"):encrypt(key_binary, iv):final(push_json)..string.rep("\0", 16));
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128 local encrypted_element = st.stanza("encrypted", { xmlns = xmlns_push_encrypt, iv = base64.encode(iv) })
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129 :text(encrypted_payload);
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130 if push_payload.type == "call" then
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131 encrypted_element.attr.type = "voip";
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132 event.important = true;
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133 end
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134 -- Replace the unencrypted notification data with the encrypted one
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135 event.notification_payload
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136 :remove_children("x", "jabber:x:data")
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137 :add_child(encrypted_element);
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138 end
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139
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140 module:hook("cloud_notify/registration", handle_register);
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141 module:hook("cloud_notify/push", handle_push, 1);