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authorMarvin W <git@larma.de>2019-09-10 20:57:10 +0200
committerMarvin W <git@larma.de>2019-09-16 23:31:11 +0200
commit392cb472abcdff9424197c8504175ee79c22dde5 (patch)
treedb3e2b7ef7fd729a3b7e316250485d53246b1b73 /plugins/omemo/src/jingle/jet_omemo.vala
parente899668213ee8f7d3566bb5754b488d8633c30c7 (diff)
downloaddino-392cb472abcdff9424197c8504175ee79c22dde5.tar.gz
dino-392cb472abcdff9424197c8504175ee79c22dde5.zip
Add support for JET-OMEMO
Diffstat (limited to 'plugins/omemo/src/jingle/jet_omemo.vala')
-rw-r--r--plugins/omemo/src/jingle/jet_omemo.vala145
1 files changed, 145 insertions, 0 deletions
diff --git a/plugins/omemo/src/jingle/jet_omemo.vala b/plugins/omemo/src/jingle/jet_omemo.vala
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+++ b/plugins/omemo/src/jingle/jet_omemo.vala
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+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));
+ }
+}
+}