Mercurial > prosody-modules

annotate mod_cloud_notify_encrypted/mod_cloud_notify_encrypted.lua @ 4467:6d595857164a

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mod_cloud_notify_encrypted: Advertise support for JMI push notifications
author Matthew Wild <mwild1@gmail.com>
date Tue, 23 Feb 2021 20:59:14 +0000
parents 38bd4d557413
children 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);