mirror of https://github.com/TakeV-Lambda/dino.git
254 lines
13 KiB
Vala
254 lines
13 KiB
Vala
using Dino.Entities;
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using Gee;
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using Xmpp;
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using Signal;
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using Qlite;
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namespace Dino.Plugins.Omemo {
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public class TrustManager {
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private StreamInteractor stream_interactor;
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private Database db;
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private ReceivedMessageListener received_message_listener;
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public TrustManager(StreamInteractor stream_interactor, Database db) {
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this.stream_interactor = stream_interactor;
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this.db = db;
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received_message_listener = new ReceivedMessageListener(stream_interactor, db);
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stream_interactor.get_module(MessageProcessor.IDENTITY).received_pipeline.connect(received_message_listener);
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}
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public void set_blind_trust(Account account, Jid jid, bool blind_trust) {
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int identity_id = db.identity.get_id(account.id);
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if (identity_id < 0) return;
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db.trust.update()
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.with(db.trust.identity_id, "=", identity_id)
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.with(db.trust.address_name, "=", jid.bare_jid.to_string())
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.set(db.trust.blind_trust, blind_trust).perform();
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}
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public void set_device_trust(Account account, Jid jid, int device_id, Database.IdentityMetaTable.TrustLevel trust_level) {
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int identity_id = db.identity.get_id(account.id);
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db.identity_meta.update()
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.with(db.identity_meta.identity_id, "=", identity_id)
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.with(db.identity_meta.address_name, "=", jid.bare_jid.to_string())
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.with(db.identity_meta.device_id, "=", device_id)
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.set(db.identity_meta.trust_level, trust_level).perform();
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}
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private StanzaNode create_encrypted_key(uint8[] key, Address address, Store store) throws GLib.Error {
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SessionCipher cipher = store.create_session_cipher(address);
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CiphertextMessage device_key = cipher.encrypt(key);
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StanzaNode key_node = new StanzaNode.build("key", NS_URI)
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.put_attribute("rid", address.device_id.to_string())
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.put_node(new StanzaNode.text(Base64.encode(device_key.serialized)));
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if (device_key.type == CiphertextType.PREKEY) key_node.put_attribute("prekey", "true");
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return key_node;
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}
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public EncryptState encrypt(MessageStanza message, Jid self_jid, Gee.List<Jid> recipients, XmppStream stream, Account account) {
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EncryptState status = new EncryptState();
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if (!Plugin.ensure_context()) return status;
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if (message.to == null) return status;
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StreamModule module = stream.get_module(StreamModule.IDENTITY);
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try {
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//Check we have the bundles and device lists needed to send the message
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if (!is_known_address(account, self_jid)) return status;
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status.own_list = true;
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status.own_devices = get_trusted_devices(account, self_jid).size;
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status.other_waiting_lists = 0;
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status.other_devices = 0;
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foreach (Jid recipient in recipients) {
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if (!is_known_address(account, recipient)) {
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status.other_waiting_lists++;
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}
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if (status.other_waiting_lists > 0) return status;
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status.other_devices += get_trusted_devices(account, recipient).size;
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}
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if (status.own_devices == 0 || status.other_devices == 0) return status;
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//Create a key and use it to encrypt the message
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uint8[] key = new uint8[16];
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Plugin.get_context().randomize(key);
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uint8[] iv = new uint8[16];
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Plugin.get_context().randomize(iv);
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uint8[] ciphertext = aes_encrypt(Cipher.AES_GCM_NOPADDING, key, iv, message.body.data);
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StanzaNode header;
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StanzaNode encrypted = new StanzaNode.build("encrypted", NS_URI).add_self_xmlns()
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.put_node(header = new StanzaNode.build("header", NS_URI)
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.put_attribute("sid", module.store.local_registration_id.to_string())
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.put_node(new StanzaNode.build("iv", NS_URI)
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.put_node(new StanzaNode.text(Base64.encode(iv)))))
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.put_node(new StanzaNode.build("payload", NS_URI)
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.put_node(new StanzaNode.text(Base64.encode(ciphertext))));
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//Encrypt the key for each recipient's device individually
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Address address = new Address(message.to.bare_jid.to_string(), 0);
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foreach (Jid recipient in recipients) {
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foreach(int32 device_id in get_trusted_devices(account, recipient)) {
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if (module.is_ignored_device(recipient, device_id)) {
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status.other_lost++;
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continue;
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}
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try {
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address.name = recipient.bare_jid.to_string();
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address.device_id = (int) device_id;
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StanzaNode key_node = create_encrypted_key(key, address, module.store);
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header.put_node(key_node);
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status.other_success++;
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} catch (Error e) {
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if (e.code == ErrorCode.UNKNOWN) status.other_unknown++;
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else status.other_failure++;
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}
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}
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}
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address.name = self_jid.bare_jid.to_string();
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foreach(int32 device_id in get_trusted_devices(account, self_jid)) {
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if (module.is_ignored_device(self_jid, device_id)) {
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status.own_lost++;
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continue;
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}
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if (device_id != module.store.local_registration_id) {
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address.device_id = (int) device_id;
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try {
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StanzaNode key_node = create_encrypted_key(key, address, module.store);
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header.put_node(key_node);
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status.own_success++;
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} catch (Error e) {
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if (e.code == ErrorCode.UNKNOWN) status.own_unknown++;
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else status.own_failure++;
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}
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}
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}
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message.stanza.put_node(encrypted);
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Xep.ExplicitEncryption.add_encryption_tag_to_message(message, NS_URI, "OMEMO");
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message.body = "[This message is OMEMO encrypted]";
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status.encrypted = true;
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} catch (Error e) {
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if (Plugin.DEBUG) print(@"OMEMO: Signal error while encrypting message: $(e.message)\n");
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}
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return status;
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}
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public bool is_known_address(Account account, Jid jid) {
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int identity_id = db.identity.get_id(account.id);
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if (identity_id < 0) return false;
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return db.identity_meta.with_address(identity_id, jid.to_string()).count() > 0;
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}
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public Gee.List<int32> get_trusted_devices(Account account, Jid jid) {
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Gee.List<int32> devices = new ArrayList<int32>();
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int identity_id = db.identity.get_id(account.id);
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if (identity_id < 0) return devices;
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foreach (Row device in db.identity_meta.get_trusted_devices(identity_id, jid.bare_jid.to_string())) {
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if(device[db.identity_meta.trust_level] != Database.IdentityMetaTable.TrustLevel.UNKNOWN || device[db.identity_meta.identity_key_public_base64] == null)
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devices.add(device[db.identity_meta.device_id]);
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}
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return devices;
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}
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private class ReceivedMessageListener : MessageListener {
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public string[] after_actions_const = new string[]{ };
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public override string action_group { get { return "DECRYPT"; } }
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public override string[] after_actions { get { return after_actions_const; } }
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private StreamInteractor stream_interactor;
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private Database db;
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public ReceivedMessageListener(StreamInteractor stream_interactor, Database db) {
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this.stream_interactor = stream_interactor;
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this.db = db;
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}
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public override async bool run(Entities.Message message, Xmpp.MessageStanza stanza, Conversation conversation) {
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Store store = stream_interactor.module_manager.get_module(conversation.account, StreamModule.IDENTITY).store;
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StanzaNode? _encrypted = stanza.stanza.get_subnode("encrypted", NS_URI);
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if (_encrypted == null || MessageFlag.get_flag(stanza) != null || stanza.from == null) return false;
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StanzaNode encrypted = (!)_encrypted;
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if (!Plugin.ensure_context()) return false;
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MessageFlag flag = new MessageFlag();
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stanza.add_flag(flag);
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StanzaNode? _header = encrypted.get_subnode("header");
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if (_header == null) return false;
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StanzaNode header = (!)_header;
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if (header.get_attribute_int("sid") <= 0) return false;
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foreach (StanzaNode key_node in header.get_subnodes("key")) {
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if (key_node.get_attribute_int("rid") == store.local_registration_id) {
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try {
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string? payload = encrypted.get_deep_string_content("payload");
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string? iv_node = header.get_deep_string_content("iv");
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string? key_node_content = key_node.get_string_content();
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if (payload == null || iv_node == null || key_node_content == null) continue;
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uint8[] key;
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uint8[] ciphertext = Base64.decode((!)payload);
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uint8[] iv = Base64.decode((!)iv_node);
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Jid jid = stanza.from;
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if (conversation.type_ == Conversation.Type.GROUPCHAT) {
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jid = stream_interactor.get_module(MucManager.IDENTITY).get_real_jid(jid, conversation.account);
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}
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Address address = new Address(jid.bare_jid.to_string(), header.get_attribute_int("sid"));
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if (key_node.get_attribute_bool("prekey")) {
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PreKeySignalMessage msg = Plugin.get_context().deserialize_pre_key_signal_message(Base64.decode((!)key_node_content));
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SessionCipher cipher = store.create_session_cipher(address);
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key = cipher.decrypt_pre_key_signal_message(msg);
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} else {
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SignalMessage msg = Plugin.get_context().deserialize_signal_message(Base64.decode((!)key_node_content));
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SessionCipher cipher = store.create_session_cipher(address);
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key = cipher.decrypt_signal_message(msg);
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}
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address.device_id = 0; // TODO: Hack to have address obj live longer
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if (key.length >= 32) {
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int authtaglength = key.length - 16;
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uint8[] new_ciphertext = new uint8[ciphertext.length + authtaglength];
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uint8[] new_key = new uint8[16];
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Memory.copy(new_ciphertext, ciphertext, ciphertext.length);
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Memory.copy((uint8*)new_ciphertext + ciphertext.length, (uint8*)key + 16, authtaglength);
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Memory.copy(new_key, key, 16);
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ciphertext = new_ciphertext;
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key = new_key;
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}
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message.body = arr_to_str(aes_decrypt(Cipher.AES_GCM_NOPADDING, key, iv, ciphertext));
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flag.decrypted = true;
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int identity_id = db.identity.get_id(conversation.account.id);
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if (identity_id < 0) return false;
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Database.IdentityMetaTable.TrustLevel trust_level = (Database.IdentityMetaTable.TrustLevel) db.identity_meta.get_device(identity_id, jid.bare_jid.to_string(), header.get_attribute_int("sid"))[db.identity_meta.trust_level];
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if (trust_level == Database.IdentityMetaTable.TrustLevel.UNTRUSTED) {
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message.body = _("OMEMO message from a rejected device");
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message.marked = Message.Marked.WONTSEND;
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}
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if (trust_level == Database.IdentityMetaTable.TrustLevel.UNKNOWN) {
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message.body = _("OMEMO message from an unknown device: ")+message.body;
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message.marked = Message.Marked.WONTSEND;
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}
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} catch (Error e) {
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if (Plugin.DEBUG) print(@"OMEMO: Signal error while decrypting message: $(e.message)\n");
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}
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}
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}
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return false;
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}
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private string arr_to_str(uint8[] arr) {
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// null-terminate the array
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uint8[] rarr = new uint8[arr.length+1];
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Memory.copy(rarr, arr, arr.length);
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return (string)rarr;
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}
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}
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}
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}
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