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annotate mod_cloud_notify_encrypted/mod_cloud_notify_encrypted.lua @ 4409:44f6537f6427

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mod_invites_adhoc: Fail contact invite if user is not on current host Only the username was being used, and the host of the requester ignored. Luckily this only affects admins of the host. If they want to create an account they can use the other command. If they want to create a contact they should request from their account on this host.
author Matthew Wild <mwild1@gmail.com>
date Thu, 28 Jan 2021 07:04:11 +0000
parents 41ac0941b217
children 8ed1989e99f9
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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("enable", xmlns_push):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 local body = original_stanza:get_child_text("body");
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60 if body and #body > 255 then
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61 body = body:sub(1, 255);
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62 end
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63
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64 local push_payload = {
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65 unread = tonumber(push_summary["message-count"]) or 1;
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66 sender = jid.bare(original_stanza.attr.from);
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67 message = body;
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68 };
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69
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70 if original_stanza.name == "message" then
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71 if original_stanza.attr.type == "groupchat" then
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72 push_payload.type = "groupchat";
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73 push_payload.nickname = jid.resource(original_stanza.attr.from);
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74 elseif original_stanza.attr.type ~= "error" then
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75 local jmi_propose = original_stanza:get_child("propose", xmlns_jmi);
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76 if jmi_propose then
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77 push_payload.type = "call";
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78 push_payload.sid = jmi_propose.attr.id;
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79 else
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80 push_payload.type = "chat";
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81 end
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82 end
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83 elseif original_stanza.name == "presence"
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84 and original_stanza.attr.type == "subscribe" then
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85 push_payload.type = "subscribe";
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86 end
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87
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88 local iv = random.bytes(12);
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89 local key_binary = base64.decode(encryption.key_base64);
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90 local push_json = json.encode(push_payload);
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91
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92 -- FIXME: luaossl does not expose the EVP_CTRL_GCM_GET_TAG API, so we append 16 NUL bytes
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93 -- Siskin does not validate the tag anyway.
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94 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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95 local encrypted_element = st.stanza("encrypted", { xmlns = xmlns_push_encrypt, iv = base64.encode(iv) })
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96 :text(encrypted_payload);
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97 -- Replace the unencrypted notification data with the encrypted one
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98 event.notification_payload
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99 :remove_children("x", "jabber:x:data")
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100 :add_child(encrypted_element);
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101 end
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102
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103 module:hook("cloud_notify/registration", handle_register);
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104 module:hook("cloud_notify/push", handle_push);