Mercurial > prosody-modules

annotate mod_cloud_notify_encrypted/mod_cloud_notify_encrypted.lua @ 4460:205e50fdcebc

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mod_ogp: Add README
author JC Brand <jc@opkode.com>
date Mon, 22 Feb 2021 17:51:51 +0100
parents 091d06c7d724
children 2a7a76712e71
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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_push = "urn:xmpp:push:0";
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12 local xmlns_push_encrypt = "tigase:push:encrypt:0";
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13 local xmlns_push_encrypt_aes_128_gcm = "tigase:push:encrypt:aes-128-gcm";
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14
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15 -- https://xeps.tigase.net//docs/push-notifications/encrypt/#41-discovering-support
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16 local function account_disco_info(event)
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17 event.reply:tag("feature", {var=xmlns_push_encrypt}):up();
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18 event.reply:tag("feature", {var=xmlns_push_encrypt_aes_128_gcm}):up();
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19 end
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20 module:hook("account-disco-info", account_disco_info);
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21
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22 function handle_register(event)
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23 local encrypt = event.stanza:get_child("enable", xmlns_push):get_child("encrypt", xmlns_push_encrypt);
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24 if not encrypt then return; end
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25
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26 local algorithm = encrypt.attr.alg;
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27 if algorithm ~= "aes-128-gcm" then
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28 event.origin.send(st.error_reply(
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29 event.stanza, "modify", "feature-not-implemented", "Unknown encryption algorithm"
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30 ));
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31 return false;
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32 end
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33
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34 local key_base64 = encrypt:get_text();
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35 local key_binary = base64.decode(key_base64);
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36 if not key_binary or #key_binary ~= 16 then
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37 event.origin.send(st.error_reply(
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38 event.stanza, "modify", "bad-request", "Invalid encryption key"
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39 ));
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40 return false;
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41 end
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42
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43 event.push_info.encryption = {
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44 algorithm = algorithm;
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45 key_base64 = key_base64;
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46 };
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47 end
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48
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49 function handle_push(event)
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50 local encryption = event.push_info.encryption;
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51 if not encryption then return; end
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52
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53 if encryption.algorithm ~= "aes-128-gcm" then
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54 event.reason = "Unsupported encryption algorithm: "..tostring(encryption.algorithm);
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55 return true;
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56 end
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57
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58 local push_summary = event.push_summary;
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59
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60 local original_stanza = event.original_stanza;
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61 local body = original_stanza:get_child_text("body");
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62 if body and #body > 255 then
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63 body = body:sub(1, 255);
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64 end
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65
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66 local push_payload = {
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67 unread = tonumber(push_summary["message-count"]) or 1;
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68 sender = jid.bare(original_stanza.attr.from);
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69 message = body;
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70 };
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71
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72 if original_stanza.name == "message" then
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73 if original_stanza.attr.type == "groupchat" then
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74 push_payload.type = "groupchat";
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75 push_payload.nickname = jid.resource(original_stanza.attr.from);
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76 elseif original_stanza.attr.type ~= "error" then
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77 local jmi_propose = original_stanza:get_child("propose", xmlns_jmi);
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78 if jmi_propose then
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79 push_payload.type = "call";
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80 push_payload.sid = jmi_propose.attr.id;
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81 local media_types = set.new();
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82 for description in jmi_propose:childtags("description") do
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83 local media_type = description.attr.media;
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84 if media_type then
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85 media_types:add(media_type);
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86 end
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87 end
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88 push_payload.media = array.collect(media_types:items());
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89 else
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90 push_payload.type = "chat";
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91 end
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92 end
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93 elseif original_stanza.name == "presence"
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94 and original_stanza.attr.type == "subscribe" then
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95 push_payload.type = "subscribe";
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96 end
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97
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98 local iv = random.bytes(12);
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99 local key_binary = base64.decode(encryption.key_base64);
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100 local push_json = json.encode(push_payload);
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101
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102 -- FIXME: luaossl does not expose the EVP_CTRL_GCM_GET_TAG API, so we append 16 NUL bytes
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103 -- Siskin does not validate the tag anyway.
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104 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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105 local encrypted_element = st.stanza("encrypted", { xmlns = xmlns_push_encrypt, iv = base64.encode(iv) })
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106 :text(encrypted_payload);
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107 if push_payload.type == "call" then
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108 encrypted_element.attr.type = "voip";
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109 event.important = true;
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110 end
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111 -- Replace the unencrypted notification data with the encrypted one
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112 event.notification_payload
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113 :remove_children("x", "jabber:x:data")
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114 :add_child(encrypted_element);
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115 end
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116
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117 module:hook("cloud_notify/registration", handle_register);
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118 module:hook("cloud_notify/push", handle_push, 1);