diff options
Diffstat (limited to 'plugins/omemo/src/jingle')
| -rw-r--r-- | plugins/omemo/src/jingle/jet_omemo.vala | 145 | ||||
| -rw-r--r-- | plugins/omemo/src/jingle/jingle_helper.vala | 53 |
2 files changed, 198 insertions, 0 deletions
diff --git a/plugins/omemo/src/jingle/jet_omemo.vala b/plugins/omemo/src/jingle/jet_omemo.vala new file mode 100644 index 00000000..2ddf5d33 --- /dev/null +++ b/plugins/omemo/src/jingle/jet_omemo.vala @@ -0,0 +1,145 @@ +using Crypto; +using Dino; +using Dino.Entities; +using Gee; +using Signal; +using Xmpp; +using Xmpp.Xep; + +namespace Dino.Plugins.JetOmemo { +private const string NS_URI = "urn:xmpp:jingle:jet-omemo:0"; +private const string AES_128_GCM_URI = "urn:xmpp:ciphers:aes-128-gcm-nopadding"; +public class Module : XmppStreamModule, Jet.EnvelopEncoding { + public static Xmpp.ModuleIdentity<Module> IDENTITY = new Xmpp.ModuleIdentity<Module>(NS_URI, "0396_jet_omemo"); + private Omemo.Plugin plugin; + + public Module(Omemo.Plugin plugin) { + this.plugin = plugin; + } + + public override void attach(XmppStream stream) { + if (stream.get_module(Jet.Module.IDENTITY) != null) { + stream.get_module(ServiceDiscovery.Module.IDENTITY).add_feature(stream, NS_URI); + stream.get_module(Jet.Module.IDENTITY).register_envelop_encoding(this); + stream.get_module(Jet.Module.IDENTITY).register_cipher(new AesGcmCipher(16, AES_128_GCM_URI)); + } + } + + public override void detach(XmppStream stream) { + } + + public bool is_available(XmppStream stream, Jid full_jid) { + bool? has_feature = stream.get_flag(ServiceDiscovery.Flag.IDENTITY).has_entity_feature(full_jid, NS_URI); + if (has_feature == null || !(!)has_feature) { + return false; + } + return stream.get_module(Xep.Jet.Module.IDENTITY).is_available(stream, full_jid); + } + + public string get_type_uri() { + return Omemo.NS_URI; + } + + public Jet.TransportSecret decode_envolop(XmppStream stream, Jid local_full_jid, Jid peer_full_jid, StanzaNode security) throws Jingle.IqError { + Store store = stream.get_module(Omemo.StreamModule.IDENTITY).store; + StanzaNode? encrypted = security.get_subnode("encrypted", Omemo.NS_URI); + if (encrypted == null) throw new Jingle.IqError.BAD_REQUEST("Invalid JET-OMEMO envelop: missing encrypted element"); + StanzaNode? header = encrypted.get_subnode("header", Omemo.NS_URI); + if (header == null) throw new Jingle.IqError.BAD_REQUEST("Invalid JET-OMEMO envelop: missing header element"); + string? iv_node = header.get_deep_string_content("iv"); + if (header == null) throw new Jingle.IqError.BAD_REQUEST("Invalid JET-OMEMO envelop: missing iv element"); + uint8[] iv = Base64.decode((!)iv_node); + foreach (StanzaNode key_node in header.get_subnodes("key")) { + if (key_node.get_attribute_int("rid") == store.local_registration_id) { + string? key_node_content = key_node.get_string_content(); + + uint8[] key; + Address address = new Address(peer_full_jid.bare_jid.to_string(), header.get_attribute_int("sid")); + if (key_node.get_attribute_bool("prekey")) { + PreKeySignalMessage msg = Omemo.Plugin.get_context().deserialize_pre_key_signal_message(Base64.decode((!)key_node_content)); + SessionCipher cipher = store.create_session_cipher(address); + key = cipher.decrypt_pre_key_signal_message(msg); + } else { + SignalMessage msg = Omemo.Plugin.get_context().deserialize_signal_message(Base64.decode((!)key_node_content)); + SessionCipher cipher = store.create_session_cipher(address); + key = cipher.decrypt_signal_message(msg); + } + address.device_id = 0; // TODO: Hack to have address obj live longer + + uint8[] authtag = null; + if (key.length >= 32) { + int authtaglength = key.length - 16; + authtag = new uint8[authtaglength]; + uint8[] new_key = new uint8[16]; + Memory.copy(authtag, (uint8*)key + 16, 16); + Memory.copy(new_key, key, 16); + key = new_key; + } + // TODO: authtag? + return new Jet.TransportSecret(key, iv); + } + } + throw new Jingle.IqError.NOT_ACCEPTABLE("Not encrypted for targeted device"); + } + + public void encode_envelop(XmppStream stream, Jid local_full_jid, Jid peer_full_jid, Jet.SecurityParameters security_params, StanzaNode security) { + ArrayList<Account> accounts = plugin.app.stream_interactor.get_accounts(); + Store store = stream.get_module(Omemo.StreamModule.IDENTITY).store; + Account? account = null; + foreach (Account compare in accounts) { + if (compare.bare_jid.equals_bare(local_full_jid)) { + account = compare; + break; + } + } + if (account == null) { + // TODO + critical("Sending from offline account %s", local_full_jid.to_string()); + } + + StanzaNode header_node; + StanzaNode encrypted_node = new StanzaNode.build("encrypted", Omemo.NS_URI).add_self_xmlns() + .put_node(header_node = new StanzaNode.build("header", Omemo.NS_URI) + .put_attribute("sid", store.local_registration_id.to_string()) + .put_node(new StanzaNode.build("iv", Omemo.NS_URI) + .put_node(new StanzaNode.text(Base64.encode(security_params.secret.initialization_vector))))); + + plugin.trust_manager.encrypt_key(header_node, security_params.secret.transport_key, local_full_jid.bare_jid, new ArrayList<Jid>.wrap(new Jid[] {peer_full_jid.bare_jid}), stream, account); + security.put_node(encrypted_node); + } + + public override string get_ns() { return NS_URI; } + public override string get_id() { return IDENTITY.id; } +} + +public class AesGcmCipher : Jet.Cipher, Object { + private int key_size; + private string uri; + public AesGcmCipher(int key_size, string uri) { + this.key_size = key_size; + this.uri = uri; + } + public string get_cipher_uri() { + return uri; + } + public Jet.TransportSecret generate_random_secret() { + uint8[] iv = new uint8[16]; + Omemo.Plugin.get_context().randomize(iv); + uint8[] key = new uint8[key_size]; + Omemo.Plugin.get_context().randomize(key); + return new Jet.TransportSecret(key, iv); + } + public InputStream wrap_input_stream(InputStream input, Jet.TransportSecret secret) requires (secret.transport_key.length == key_size) { + SymmetricCipher cipher = new SymmetricCipher("AES-GCM"); + cipher.set_key(secret.transport_key); + cipher.set_iv(secret.initialization_vector); + return new ConverterInputStream(input, new SymmetricCipherDecrypter((owned) cipher, 16)); + } + public OutputStream wrap_output_stream(OutputStream output, Jet.TransportSecret secret) requires (secret.transport_key.length == key_size) { + Crypto.SymmetricCipher cipher = new SymmetricCipher("AES-GCM"); + cipher.set_key(secret.transport_key); + cipher.set_iv(secret.initialization_vector); + return new ConverterOutputStream(output, new SymmetricCipherEncrypter((owned) cipher, 16)); + } +} +} diff --git a/plugins/omemo/src/jingle/jingle_helper.vala b/plugins/omemo/src/jingle/jingle_helper.vala new file mode 100644 index 00000000..6814fd00 --- /dev/null +++ b/plugins/omemo/src/jingle/jingle_helper.vala @@ -0,0 +1,53 @@ +using Dino.Entities; +using Xmpp; + +namespace Dino.Plugins.JetOmemo { +public class EncryptionHelper : JingleFileEncryptionHelper, Object { + private StreamInteractor stream_interactor; + + public EncryptionHelper(StreamInteractor stream_interactor) { + this.stream_interactor = stream_interactor; + } + + public bool can_transfer(Conversation conversation) { + return true; + } + + public bool can_encrypt(Conversation conversation, FileTransfer file_transfer, Jid? full_jid) { + XmppStream? stream = stream_interactor.get_stream(conversation.account); + if (stream == null) return false; + + Gee.List<Jid>? resources = stream.get_flag(Presence.Flag.IDENTITY).get_resources(conversation.counterpart); + if (resources == null) return false; + + if (full_jid == null) { + foreach (Jid test_jid in resources) { + if (stream.get_module(Module.IDENTITY).is_available(stream, test_jid)) { + return true; + } + } + } else { + if (stream.get_module(Module.IDENTITY).is_available(stream, full_jid)) { + return true; + } + } + return false; + } + + public string? get_precondition_name(Conversation conversation, FileTransfer file_transfer) { + return Xep.Jet.NS_URI; + } + + public Object? get_precondition_options(Conversation conversation, FileTransfer file_transfer) { + return new Xep.Jet.Options(Omemo.NS_URI, AES_128_GCM_URI); + } + + public FileMeta complete_meta(FileTransfer file_transfer, FileReceiveData receive_data, FileMeta file_meta, Xmpp.Xep.JingleFileTransfer.FileTransfer jingle_transfer) { + Xep.Jet.SecurityParameters? security = jingle_transfer.security as Xep.Jet.SecurityParameters; + if (security != null && security.encoding.get_type_uri() == Omemo.NS_URI) { + file_transfer.encryption = Encryption.OMEMO; + } + return file_meta; + } +} +}
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