prosody-modules
fb4a50bf60f1
mod_cloud_notify_encrypted/mod_cloud_notify_encrypted.lua

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mod_cloud_notify_encrypted/mod_cloud_notify_encrypted.lua @ 4542:fb4a50bf60f1

mod_prometheus: Invoke stats collection if in 'manual' mode Since 10d13e0554f9 a special value for statistics_interval "manual" exists, where a module is expected to invoke processing in connection to collection of stats. This makes internal collection and exporting to Prometheus happens at the same time with no chance of timers getting out of sync.
author Kim Alvefur <zash@zash.se>
date Tue, 13 Apr 2021 23:53:53 +0200
parent 4467:6d595857164a
child 4650:44af84178cea
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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 ciphers = require "openssl.cipher";
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4 local jid = require "util.jid";
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5 local json = require "util.json";
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6 local random = require "util.random";
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7 local set = require "util.set";
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8 local st = require "util.stanza";
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9
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10 local xmlns_jmi = "urn:xmpp:jingle-message:0";
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11 local xmlns_jingle_apps_rtp = "urn:xmpp:jingle:apps:rtp:1";
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12 local xmlns_push = "urn:xmpp:push:0";
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13 local xmlns_push_encrypt = "tigase:push:encrypt:0";
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14 local xmlns_push_encrypt_aes_128_gcm = "tigase:push:encrypt:aes-128-gcm";
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15 local xmlns_push_jingle = "tigase:push:jingle:0";
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16
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17 -- https://xeps.tigase.net//docs/push-notifications/encrypt/#41-discovering-support
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18 local function account_disco_info(event)
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19 event.reply:tag("feature", {var=xmlns_push_encrypt}):up();
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20 event.reply:tag("feature", {var=xmlns_push_encrypt_aes_128_gcm}):up();
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21 event.reply:tag("feature", {var=xmlns_push_jingle}):up();
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22 end
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23 module:hook("account-disco-info", account_disco_info);
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24
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25 function handle_register(event)
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26 local encrypt = event.stanza:get_child("enable", xmlns_push):get_child("encrypt", xmlns_push_encrypt);
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27 if not encrypt then return; end
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28
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29 local algorithm = encrypt.attr.alg;
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30 if algorithm ~= "aes-128-gcm" then
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31 event.origin.send(st.error_reply(
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32 event.stanza, "modify", "feature-not-implemented", "Unknown encryption algorithm"
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33 ));
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34 return false;
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35 end
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36
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37 local key_base64 = encrypt:get_text();
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38 local key_binary = base64.decode(key_base64);
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39 if not key_binary or #key_binary ~= 16 then
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40 event.origin.send(st.error_reply(
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41 event.stanza, "modify", "bad-request", "Invalid encryption key"
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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 event.push_info.encryption = {
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47 algorithm = algorithm;
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48 key_base64 = key_base64;
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49 };
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50 end
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51
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52 function handle_push(event)
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53 local encryption = event.push_info.encryption;
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54 if not encryption then return; end
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55
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56 if encryption.algorithm ~= "aes-128-gcm" then
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57 event.reason = "Unsupported encryption algorithm: "..tostring(encryption.algorithm);
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58 return true;
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59 end
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60
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61 local push_summary = event.push_summary;
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62
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63 local original_stanza = event.original_stanza;
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64 local body = original_stanza:get_child_text("body");
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65 if body and #body > 255 then
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66 body = body:sub(1, 255);
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67 end
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68
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69 local push_payload = {
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70 unread = tonumber(push_summary["message-count"]) or 1;
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71 sender = jid.bare(original_stanza.attr.from);
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72 message = body;
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73 };
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74
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75 if original_stanza.name == "message" then
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76 if original_stanza.attr.type == "groupchat" then
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77 push_payload.type = "groupchat";
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78 push_payload.nickname = jid.resource(original_stanza.attr.from);
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79 elseif original_stanza.attr.type ~= "error" then
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80 local jmi_propose = original_stanza:get_child("propose", xmlns_jmi);
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81 if jmi_propose then
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82 push_payload.type = "call";
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83 push_payload.sid = jmi_propose.attr.id;
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84 local media_types = set.new();
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85 for description in jmi_propose:childtags("description", xmlns_jingle_apps_rtp) do
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86 local media_type = description.attr.media;
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87 if media_type then
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88 media_types:add(media_type);
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89 end
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90 end
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91 push_payload.media = array.collect(media_types:items());
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92 push_payload.sender = original_stanza.attr.from;
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93 else
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94 push_payload.type = "chat";
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95 end
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96 end
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97 elseif original_stanza.name == "presence"
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98 and original_stanza.attr.type == "subscribe" then
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99 push_payload.type = "subscribe";
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100 end
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101
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102 local iv = random.bytes(12);
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103 local key_binary = base64.decode(encryption.key_base64);
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104 local push_json = json.encode(push_payload);
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105
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106 -- FIXME: luaossl does not expose the EVP_CTRL_GCM_GET_TAG API, so we append 16 NUL bytes
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107 -- Siskin does not validate the tag anyway.
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108 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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109 local encrypted_element = st.stanza("encrypted", { xmlns = xmlns_push_encrypt, iv = base64.encode(iv) })
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110 :text(encrypted_payload);
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111 if push_payload.type == "call" then
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112 encrypted_element.attr.type = "voip";
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113 event.important = true;
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114 end
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115 -- Replace the unencrypted notification data with the encrypted one
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116 event.notification_payload
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117 :remove_children("x", "jabber:x:data")
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118 :add_child(encrypted_element);
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119 end
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120
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121 module:hook("cloud_notify/registration", handle_register);
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122 module:hook("cloud_notify/push", handle_push, 1);