Merge 'upstream/master'

1 files changed, 268 insertions, 0 deletions

diff --git a/main/src/plugins/omemo/dtls_srtp_verification_draft.vala b/main/src/plugins/omemo/dtls_srtp_verification_draft.vala
new file mode 100644
index 00000000..09617a2a
--- /dev/null
+++ b/main/src/plugins/omemo/dtls_srtp_verification_draft.vala
@@ -0,0 +1,268 @@
+using Omemo;
+using Gee;
+using Xmpp;
+
+namespace Dino.Plugins.Omemo.DtlsSrtpVerificationDraft {
+    public const string NS_URI = "http://gultsch.de/xmpp/drafts/omemo/dlts-srtp-verification";
+
+    public class StreamModule : XmppStreamModule {
+
+        public static Xmpp.ModuleIdentity<StreamModule> IDENTITY = new Xmpp.ModuleIdentity<StreamModule>(NS_URI, "dtls_srtp_omemo_verification_draft");
+
+        private VerificationSendListener send_listener = new VerificationSendListener();
+        private HashMap<string, int> device_id_by_jingle_sid = new HashMap<string, int>();
+        private HashMap<string, int> device_id_by_muji_member = new HashMap<string, int>();
+        private HashMap<string, Gee.List<string>> content_names_by_jingle_sid = new HashMap<string, Gee.List<string>>();
+
+        private void on_preprocess_incoming_iq_set_get(XmppStream stream, Xmpp.Iq.Stanza iq) {
+            if (iq.type_ != Iq.Stanza.TYPE_SET) return;
+
+            Gee.List<StanzaNode> content_nodes = iq.stanza.get_deep_subnodes(Xep.Jingle.NS_URI + ":jingle", Xep.Jingle.NS_URI + ":content");
+            if (content_nodes.size == 0) return;
+
+            string? jingle_sid = iq.stanza.get_deep_attribute(Xep.Jingle.NS_URI + ":jingle", "sid");
+            if (jingle_sid == null) return;
+
+            Xep.Omemo.OmemoDecryptor decryptor = stream.get_module(Xep.Omemo.OmemoDecryptor.IDENTITY);
+
+            foreach (StanzaNode content_node in content_nodes) {
+                string? content_name = content_node.get_attribute("name");
+                if (content_name == null) continue;
+                StanzaNode? transport_node = content_node.get_subnode("transport", Xep.JingleIceUdp.NS_URI);
+                if (transport_node == null) continue;
+                StanzaNode? fingerprint_node = transport_node.get_subnode("fingerprint", NS_URI);
+                if (fingerprint_node == null) continue;
+                StanzaNode? encrypted_node = fingerprint_node.get_subnode("encrypted", Omemo.NS_URI);
+                if (encrypted_node == null) continue;
+
+                Xep.Omemo.ParsedData? parsed_data = decryptor.parse_node(encrypted_node);
+                if (parsed_data == null || parsed_data.ciphertext == null) continue;
+
+                if (device_id_by_jingle_sid.has_key(jingle_sid) && device_id_by_jingle_sid[jingle_sid] != parsed_data.sid) {
+                    warning("Expected DTLS fingerprint to be OMEMO encrypted from %s %d, but it was from %d", iq.from.to_string(), device_id_by_jingle_sid[jingle_sid], parsed_data.sid);
+                }
+
+                foreach (Bytes encr_key in parsed_data.our_potential_encrypted_keys.keys) {
+                    parsed_data.is_prekey = parsed_data.our_potential_encrypted_keys[encr_key];
+                    parsed_data.encrypted_key = encr_key.get_data();
+
+                    try {
+                        uint8[] key = decryptor.decrypt_key(parsed_data, iq.from.bare_jid);
+                        string cleartext = decryptor.decrypt(parsed_data.ciphertext, key, parsed_data.iv);
+
+                        StanzaNode new_fingerprint_node = new StanzaNode.build("fingerprint", Xep.JingleIceUdp.DTLS_NS_URI).add_self_xmlns()
+                                .put_node(new StanzaNode.text(cleartext));
+                        string? hash_attr = fingerprint_node.get_attribute("hash", NS_URI);
+                        string? setup_attr = fingerprint_node.get_attribute("setup", NS_URI);
+                        if (hash_attr != null) new_fingerprint_node.put_attribute("hash", hash_attr);
+                        if (setup_attr != null) new_fingerprint_node.put_attribute("setup", setup_attr);
+                        transport_node.put_node(new_fingerprint_node);
+
+                        device_id_by_jingle_sid[jingle_sid] = parsed_data.sid;
+                        if (!content_names_by_jingle_sid.has_key(content_name)) {
+                            content_names_by_jingle_sid[content_name] = new ArrayList<string>();
+                        }
+                        content_names_by_jingle_sid[content_name].add(content_name);
+
+                        stream.get_flag(Xep.Jingle.Flag.IDENTITY).get_session.begin(jingle_sid, (_, res) => {
+                            Xep.Jingle.Session? session = stream.get_flag(Xep.Jingle.Flag.IDENTITY).get_session.end(res);
+                            if (session == null || !session.contents_map.has_key(content_name)) return;
+                            var encryption = new OmemoContentEncryption(NS_URI, "OMEMO", iq.from.bare_jid, device_id_by_jingle_sid[jingle_sid]);
+                            session.contents_map[content_name].encryptions[NS_URI] = encryption;
+
+                            if (iq.stanza.get_deep_attribute(Xep.Jingle.NS_URI + ":jingle", "action") == "session-accept") {
+                                session.additional_content_add_incoming.connect(on_content_add_received);
+                            }
+                        });
+
+                        break;
+                    } catch (Error e) {
+                        debug("Decrypting message from %s/%d failed: %s", iq.from.bare_jid.to_string(), parsed_data.sid, e.message);
+                    }
+                }
+            }
+        }
+
+        private void on_preprocess_outgoing_iq_set_get(XmppStream stream, Xmpp.Iq.Stanza iq) {
+            if (iq.type_ != Iq.Stanza.TYPE_SET) return;
+
+            StanzaNode? jingle_node = iq.stanza.get_subnode("jingle", Xep.Jingle.NS_URI);
+            if (jingle_node == null) return;
+
+            int device_id = -1;
+            string? sid = jingle_node.get_attribute("sid", Xep.Jingle.NS_URI);
+            if (sid != null && device_id_by_jingle_sid.has_key(sid)) {
+                device_id = device_id_by_jingle_sid[sid];
+            }
+
+            StanzaNode? muji_node = jingle_node.get_subnode("muji", Xep.Muji.NS_URI);
+            if (muji_node != null) {
+                string muji_room = muji_node.get_attribute("room");
+                try {
+                    Jid muji_jid = Jid.from_string(muji_room);
+                    if (device_id_by_muji_member.has_key(@"$(muji_jid.bare_jid)/$(iq.to)")) {
+                        device_id = device_id_by_muji_member[@"$(muji_jid.bare_jid)/$(iq.to)"];
+                    }
+                } catch (InvalidJidError e) {
+                    // Ignore
+                }
+            }
+
+            if (device_id == -1) return;
+
+            Gee.List<StanzaNode> content_nodes = jingle_node.get_subnodes("content", Xep.Jingle.NS_URI);
+            if (content_nodes.size == 0) return;
+
+            foreach (StanzaNode content_node in content_nodes) {
+                StanzaNode? transport_node = content_node.get_subnode("transport", Xep.JingleIceUdp.NS_URI);
+                if (transport_node == null) continue;
+                StanzaNode? fingerprint_node = transport_node.get_subnode("fingerprint", Xep.JingleIceUdp.DTLS_NS_URI);
+                if (fingerprint_node == null) continue;
+                string fingerprint = fingerprint_node.get_deep_string_content();
+
+                StanzaNode? encrypted_node = null;
+                try {
+                    Xep.Omemo.OmemoEncryptor encryptor = stream.get_module(Xep.Omemo.OmemoEncryptor.IDENTITY);
+                    Xep.Omemo.EncryptionData enc_data = encryptor.encrypt_plaintext(fingerprint);
+                    encryptor.encrypt_key(enc_data, iq.to.bare_jid, device_id);
+                    encrypted_node = enc_data.get_encrypted_node();
+                } catch (Error e) {
+                    warning("Error while OMEMO-encrypting call keys: %s", e.message);
+                    return;
+                }
+
+                StanzaNode new_fingerprint_node = new StanzaNode.build("fingerprint", NS_URI).add_self_xmlns().put_node(encrypted_node);
+                string? hash_attr = fingerprint_node.get_attribute("hash", Xep.JingleIceUdp.DTLS_NS_URI);
+                string? setup_attr = fingerprint_node.get_attribute("setup", Xep.JingleIceUdp.DTLS_NS_URI);
+                if (hash_attr != null) new_fingerprint_node.put_attribute("hash", hash_attr);
+                if (setup_attr != null) new_fingerprint_node.put_attribute("setup", setup_attr);
+                transport_node.put_node(new_fingerprint_node);
+
+                transport_node.sub_nodes.remove(fingerprint_node);
+            }
+        }
+
+        private void on_message_received(XmppStream stream, Xmpp.MessageStanza message) {
+            StanzaNode? proceed_node = message.stanza.get_subnode("proceed", Xep.JingleMessageInitiation.NS_URI);
+            if (proceed_node == null) return;
+
+            string? jingle_sid = proceed_node.get_attribute("id");
+            if (jingle_sid == null) return;
+
+            StanzaNode? device_node = proceed_node.get_subnode("device", NS_URI);
+            if (device_node == null) return;
+
+            int device_id = device_node.get_attribute_int("id", -1);
+            if (device_id == -1) return;
+
+            device_id_by_jingle_sid[jingle_sid] = device_id;
+        }
+
+        private void on_session_initiate_received(XmppStream stream, Xep.Jingle.Session session) {
+            if (device_id_by_jingle_sid.has_key(session.sid)) {
+                foreach (Xep.Jingle.Content content in session.contents) {
+                    on_content_add_received(stream, content);
+                }
+            }
+            session.additional_content_add_incoming.connect(on_content_add_received);
+        }
+
+        private void on_content_add_received(XmppStream stream, Xep.Jingle.Content content) {
+            if (!content_names_by_jingle_sid.has_key(content.session.sid) || content_names_by_jingle_sid[content.session.sid].contains(content.content_name)) {
+                var encryption = new OmemoContentEncryption(NS_URI, "OMEMO", content.peer_full_jid.bare_jid, device_id_by_jingle_sid[content.session.sid]);
+                content.encryptions[encryption.encryption_ns] = encryption;
+            }
+        }
+
+        private void on_pre_send_presence_stanza(XmppStream stream, Presence.Stanza presence) {
+            StanzaNode? muji_node = presence.stanza.get_subnode("muji", Xep.Muji.NS_URI);
+            if (muji_node == null) return;
+
+            StanzaNode device_node = new StanzaNode.build("device", NS_URI).add_self_xmlns()
+                    .put_attribute("id", stream.get_module(Omemo.StreamModule.IDENTITY).store.local_registration_id.to_string());
+            muji_node.put_node(device_node);
+        }
+
+        private void on_received_available(XmppStream stream, Presence.Stanza presence) {
+            StanzaNode? muji_node = presence.stanza.get_subnode("muji", Xep.Muji.NS_URI);
+            if (muji_node == null) return;
+
+            StanzaNode? device_node = muji_node.get_subnode("device", NS_URI);
+            if (device_node == null) return;
+
+            int device_id = device_node.get_attribute_int("id", -1);
+            if (device_id == -1) return;
+
+            StanzaNode? muc_x_node = presence.stanza.get_subnode("x", "http://jabber.org/protocol/muc#user");
+            if (muc_x_node == null) return;
+
+            StanzaNode? item_node = muc_x_node.get_subnode("item");
+            if (item_node == null) return;
+
+            Jid? real_jid = null;
+            try {
+                string jid_attribute = item_node.get_attribute("jid");
+                if (jid_attribute == null) return;
+                real_jid = Jid.from_string(jid_attribute);
+            } catch (InvalidJidError e) {
+                // Ignore
+                return;
+            }
+
+            device_id_by_muji_member[@"$(presence.from.bare_jid)/$(real_jid)"] = device_id;
+        }
+
+        public override void attach(XmppStream stream) {
+            stream.get_module(Xmpp.MessageModule.IDENTITY).received_message.connect(on_message_received);
+            stream.get_module(Xmpp.MessageModule.IDENTITY).send_pipeline.connect(send_listener);
+            stream.get_module(Xmpp.Iq.Module.IDENTITY).preprocess_incoming_iq_set_get.connect(on_preprocess_incoming_iq_set_get);
+            stream.get_module(Xmpp.Iq.Module.IDENTITY).preprocess_outgoing_iq_set_get.connect(on_preprocess_outgoing_iq_set_get);
+            stream.get_module(Xep.Jingle.Module.IDENTITY).session_initiate_received.connect(on_session_initiate_received);
+            stream.get_module(Xmpp.Presence.Module.IDENTITY).pre_send_presence_stanza.connect(on_pre_send_presence_stanza);
+            stream.get_module(Xmpp.Presence.Module.IDENTITY).received_available.connect(on_received_available);
+        }
+
+        public override void detach(XmppStream stream) {
+            stream.get_module(Xmpp.MessageModule.IDENTITY).received_message.disconnect(on_message_received);
+            stream.get_module(Xmpp.MessageModule.IDENTITY).send_pipeline.disconnect(send_listener);
+            stream.get_module(Xmpp.Iq.Module.IDENTITY).preprocess_incoming_iq_set_get.disconnect(on_preprocess_incoming_iq_set_get);
+            stream.get_module(Xmpp.Iq.Module.IDENTITY).preprocess_outgoing_iq_set_get.disconnect(on_preprocess_outgoing_iq_set_get);
+            stream.get_module(Xep.Jingle.Module.IDENTITY).session_initiate_received.disconnect(on_session_initiate_received);
+            stream.get_module(Xmpp.Presence.Module.IDENTITY).received_available.disconnect(on_received_available);
+        }
+
+        public override string get_ns() { return NS_URI; }
+
+        public override string get_id() { return IDENTITY.id; }
+    }
+
+    public class VerificationSendListener : StanzaListener<MessageStanza> {
+
+        private string[] after_actions_const = {};
+
+        public override string action_group { get { return "REWRITE_NODES"; } }
+        public override string[] after_actions { get { return after_actions_const; } }
+
+        public override async bool run(XmppStream stream, MessageStanza message) {
+            StanzaNode? proceed_node = message.stanza.get_subnode("proceed", Xep.JingleMessageInitiation.NS_URI);
+            if (proceed_node == null) return false;
+
+            StanzaNode device_node = new StanzaNode.build("device", NS_URI).add_self_xmlns()
+                    .put_attribute("id", stream.get_module(Omemo.StreamModule.IDENTITY).store.local_registration_id.to_string());
+            proceed_node.put_node(device_node);
+            return false;
+        }
+    }
+
+    public class OmemoContentEncryption : Xep.Jingle.ContentEncryption {
+        public Jid jid { get; set; }
+        public int sid { get; set; }
+
+        public OmemoContentEncryption(string encryption_ns, string encryption_name, Jid jid, int sid) {
+            base(encryption_ns, encryption_name);
+            this.jid = jid;
+            this.sid = sid;
+        }
+    }
+}
+