Mercurial > prosody-modules

annotate mod_cloud_notify_encrypted/mod_cloud_notify_encrypted.lua @ 4928:77b7e1322281

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mod_rest: Add some notes about custom disco#info mapping code
author Kim Alvefur <zash@zash.se>
date Sun, 17 Apr 2022 12:51:45 +0200
parents 8231774f5bfd
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);