prosody-modules
d3b69859553a
mod_cloud_notify_encrypted/mod_cloud_notify_encrypted.lua

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mod_cloud_notify_encrypted/mod_cloud_notify_encrypted.lua @ 5841:d3b69859553a

mod_password_policy: Change error type from 'cancel' to 'modify' This makes more sense, as the problem relates to the data that has been entered, and therefore the request could be retried with different data.
author Matthew Wild <mwild1@gmail.com>
date Mon, 08 Jan 2024 17:28:39 +0000
parent 5055:3b609eaf0db5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 module:log("debug", "Encrypted push notifications enabled");
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56
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57 event.push_info.encryption = {
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58 algorithm = algorithm;
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59 key_base64 = key_base64;
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60 };
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61 end
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62
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63 function handle_push(event)
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64 local encryption = event.push_info.encryption;
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65 if not encryption then
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66 module:log("debug", "Encryption not enabled for this notification");
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67 return;
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68 end
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69
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70 if encryption.algorithm ~= "aes-128-gcm" then
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71 event.reason = "Unsupported encryption algorithm: "..tostring(encryption.algorithm);
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72 return true;
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73 end
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74
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75 local push_summary = event.push_summary;
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76
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77 local original_stanza = event.original_stanza;
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78 local is_encrypted_msg = detect_stanza_encryption(original_stanza);
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79 local body;
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80 if is_encrypted_msg then
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81 -- TODO: localization
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82 body = "You have received an encrypted message";
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83 else
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84 body = original_stanza:get_child_text("body");
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85 if body and #body > 255 then
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86 body = body:sub(1, 255);
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87 if not valid_utf8(body) then
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88 body = body:gsub("[\194-\244][\128-\191]*$", "");
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89 end
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90 end
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91 end
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92
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93 local push_payload = {
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94 unread = tonumber(push_summary["message-count"]) or 1;
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95 sender = jid.bare(original_stanza.attr.from);
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96 message = body;
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97 };
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98
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99 if original_stanza.name == "message" then
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100 if original_stanza.attr.type == "groupchat" then
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101 push_payload.type = "groupchat";
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102 push_payload.nickname = jid.resource(original_stanza.attr.from);
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103 elseif original_stanza.attr.type ~= "error" then
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104 local jmi_propose = original_stanza:get_child("propose", xmlns_jmi);
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105 if jmi_propose then
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106 push_payload.type = "call";
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107 push_payload.sid = jmi_propose.attr.id;
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108 local media_types = set.new();
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109 for description in jmi_propose:childtags("description", xmlns_jingle_apps_rtp) do
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110 local media_type = description.attr.media;
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111 if media_type then
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112 media_types:add(media_type);
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113 end
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114 end
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115 push_payload.media = array.collect(media_types:items());
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116 push_payload.sender = original_stanza.attr.from;
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117 else
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118 push_payload.type = "chat";
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119 end
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120 end
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121 elseif original_stanza.name == "presence"
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122 and original_stanza.attr.type == "subscribe" then
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123 push_payload.type = "subscribe";
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124 end
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125
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126 local iv = random.bytes(12);
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127 local key_binary = base64.decode(encryption.key_base64);
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128 local push_json = json.encode(push_payload);
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129
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130 -- FIXME: luaossl does not expose the EVP_CTRL_GCM_GET_TAG API, so we append 16 NUL bytes
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131 -- Siskin does not validate the tag anyway.
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132 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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133 local encrypted_element = st.stanza("encrypted", { xmlns = xmlns_push_encrypt, iv = base64.encode(iv) })
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134 :text(encrypted_payload);
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135 if push_payload.type == "call" then
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136 encrypted_element.attr.type = "voip";
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137 event.important = true;
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138 end
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139 -- Replace the unencrypted notification data with the encrypted one
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140 event.notification_payload
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141 :remove_children("x", "jabber:x:data")
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142 :add_child(encrypted_element);
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143
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144 module:log("debug", "Encrypted '%s' push notification using %s", push_payload.type, encryption.algorithm);
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145 end
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146
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147 module:hook("cloud_notify/registration", handle_register);
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148 module:hook("cloud_notify/push", handle_push, 1);