prosody-modules
beb3342f1137
mod_cloud_notify_encrypted/mod_cloud_notify_encrypted.lua

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mod_cloud_notify_encrypted/mod_cloud_notify_encrypted.lua @ 4327:beb3342f1137

mod_cloud_notify_encrypted: New module for Encrypted Push Notifications
author Matthew Wild <mwild1@gmail.com>
date Tue, 12 Jan 2021 15:43:26 +0000
child 4329:2a5164162708
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4327
beb3342f1137 mod_cloud_notify_encrypted: New module for Encrypted Push Notifications
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1 local base64 = require "util.encodings".base64;
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2 local ciphers = require "openssl.cipher";
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3 local jid = require "util.jid";
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4 local json = require "util.json";
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5 local random = require "util.random";
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6 local st = require "util.stanza";
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7
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8 local xmlns_jmi = "urn:xmpp:jingle-message:0";
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9 local xmlns_push = "urn:xmpp:push:0";
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10 local xmlns_push_encrypt = "tigase:push:encrypt:0";
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11 local xmlns_push_encrypt_aes_128_gcm = "tigase:push:encrypt:aes-128-gcm";
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12
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13 -- https://xeps.tigase.net//docs/push-notifications/encrypt/#41-discovering-support
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14 local function account_disco_info(event)
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15 event.reply:tag("feature", {var=xmlns_push_encrypt}):up();
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16 event.reply:tag("feature", {var=xmlns_push_encrypt_aes_128_gcm}):up();
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17 end
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18 module:hook("account-disco-info", account_disco_info);
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19
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20 function handle_register(event)
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21 local encrypt = event.stanza:get_child("encrypt", xmlns_push_encrypt);
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22 if not encrypt then return; end
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23
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24 local algorithm = encrypt.attr.alg;
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25 if algorithm ~= "aes-128-gcm" then
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26 event.origin.send(st.error_reply(
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27 event.stanza, "modify", "feature-not-implemented", "Unknown encryption algorithm"
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28 ));
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29 return false;
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30 end
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31
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32 local key_base64 = encrypt:get_text();
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33 local key_binary = base64.decode(key_base64);
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34 if not key_binary or #key_binary ~= 16 then
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35 event.origin.send(st.error_reply(
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36 event.stanza, "modify", "bad-request", "Invalid encryption key"
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37 ));
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38 return false;
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39 end
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40
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41 event.push_info.encryption = {
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42 algorithm = algorithm;
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43 key_base64 = key_base64;
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44 };
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45 end
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46
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47 function handle_push(event)
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48 local encryption = event.push_info.encryption;
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49 if not encryption then return; end
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50
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51 if encryption.algorithm ~= "aes-128-gcm" then
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52 event.reason = "Unsupported encryption algorithm: "..tostring(encryption.algorithm);
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53 return true;
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54 end
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55
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56 local push_summary = event.push_summary;
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57
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58 local original_stanza = event.original_stanza;
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59
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60 local push_payload = {
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61 unread = push_summary["message-count"];
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62 sender = push_summary["last-message-sender"];
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63 };
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64
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65 if original_stanza.name == "message" then
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66 if original_stanza.attr.type == "groupchat" then
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67 push_payload.type = "groupchat";
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68 push_payload.nickname = jid.resource(original_stanza.attr.from);
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69 elseif original_stanza.attr.type ~= "error" then
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70 local jmi_propose = original_stanza:get_child("propose", xmlns_jmi);
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71 if jmi_propose then
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72 push_payload.type = "call";
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73 push_payload.sid = jmi_propose.attr.id;
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74 else
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75 push_payload.type = "chat";
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76 end
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77 end
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78 elseif original_stanza.name == "presence"
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79 and original_stanza.attr.type == "subscribe" then
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80 push_payload.type = "subscribe";
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81 end
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82
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83 local iv = random.bytes(12);
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84 local key_binary = base64.decode(encryption.key_base64);
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85 local push_json = json.encode(push_payload);
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86
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87 local encrypted_payload = ciphers.new("AES-128-GCM"):encrypt(key_binary, iv):final(push_json);
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88 local encrypted_element = st.stanza("encrypted", { xmlns = xmlns_push_encrypt, iv = base64.encode(iv) })
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89 :text(encrypted_payload);
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90 -- Replace the unencrypted notification with the encrypted one
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91 event.notification_stanza
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92 :get_child("pubsub", "http://jabber.org/protocol/pubsub")
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93 :get_child("publish")
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94 :get_child("item")
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95 :remove_children("notification", xmlns_push)
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96 :add_child(encrypted_element);
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97 end
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98
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99 module:hook("cloud_notify/registration", handle_register);
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100 module:hook("cloud_notify/push", handle_push);