560 lines
23 KiB
Vala
560 lines
23 KiB
Vala
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using Gee;
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using Xmpp;
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using Xmpp.Core;
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using Xmpp.Xep;
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using Signal;
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namespace Dino.Omemo {
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private const string NS_URI = "eu.siacs.conversations.axolotl";
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private const string NODE_DEVICELIST = NS_URI + ".devicelist";
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private const string NODE_BUNDLES = NS_URI + ".bundles";
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private const string NODE_VERIFICATION = NS_URI + ".verification";
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private const int NUM_KEYS_TO_PUBLISH = 100;
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public class Module : XmppStreamModule {
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private const string ID = "axolotl_module";
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public static ModuleIdentity<Module> IDENTITY = new ModuleIdentity<Module>(NS_URI, ID);
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private Store store;
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internal static Context context;
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private bool device_list_loading = false;
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private bool device_list_modified = false;
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private Map<string, ArrayList<int32>> device_lists = new HashMap<string, ArrayList<int32>>();
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private Map<string, ArrayList<int32>> ignored_devices = new HashMap<string, ArrayList<int32>>();
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public signal void store_created(Context context, Store store);
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public signal void device_list_loaded();
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public signal void session_started(string jid, int device_id);
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public Module() {
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lock(context) {
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if (context == null) {
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try {
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context = new Context(true);
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} catch (Error e) {
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print(@"Error initializing axolotl: $(e.message)\n");
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}
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}
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}
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}
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public EncryptStatus encrypt(Message.Stanza message, string self_bare_jid) {
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EncryptStatus status = new EncryptStatus();
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if (context == null) return status;
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try {
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string name = get_bare_jid(message.to);
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if (device_lists.get(name) == null || device_lists.get(self_bare_jid) == null) return status;
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status.other_devices = device_lists.get(name).size;
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status.own_devices = device_lists.get(self_bare_jid).size;
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if (status.other_devices == 0) return status;
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uint8[] key = new uint8[16];
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context.randomize(key);
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uint8[] iv = new uint8[16];
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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 = null;
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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", 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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Address address = new Address();
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address.name = name;
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foreach(int32 device_id in device_lists[name]) {
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if (is_ignored_device(name, 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.device_id = (int) device_id;
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StanzaNode key_node = create_encrypted_key(key, address);
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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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address.name = self_bare_jid;
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foreach(int32 device_id in device_lists[self_bare_jid]) {
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if (is_ignored_device(self_bare_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 != 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);
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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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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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print(@"Axolotl 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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private StanzaNode create_encrypted_key(uint8[] key, Address address) 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 override void attach(XmppStream stream) {
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if (context == null) return;
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Message.Module.require(stream);
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Pubsub.Module.require(stream);
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stream.get_module(Message.Module.IDENTITY).pre_received_message.connect(on_pre_received_message);
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stream.get_module(Pubsub.Module.IDENTITY).add_filtered_notification(stream, NODE_DEVICELIST, on_devicelist, this);
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this.store = context.create_store();
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store_created(context, store);
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}
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private void on_pre_received_message(XmppStream stream, Message.Stanza message) {
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StanzaNode? encrypted = message.stanza.get_subnode("encrypted", NS_URI);
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if (encrypted == null) return;
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MessageFlag flag = new MessageFlag();
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message.add_flag(flag);
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StanzaNode? header = encrypted.get_subnode("header");
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if (header == null || header.get_attribute_int("sid") <= 0) return;
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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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uint8[] key = null;
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uint8[] ciphertext = Base64.decode(encrypted.get_subnode("payload").get_string_content());
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uint8[] iv = Base64.decode(header.get_subnode("iv").get_string_content());
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Address address = new Address();
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address.name = get_bare_jid(message.from);
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address.device_id = header.get_attribute_int("sid");
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if (key_node.get_attribute_bool("prekey")) {
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PreKeySignalMessage msg = context.deserialize_pre_key_signal_message(Base64.decode(key_node.get_string_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 = context.deserialize_signal_message(Base64.decode(key_node.get_string_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 != null && ciphertext != null && iv != null) {
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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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}
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} catch (Error e) {
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print(@"Axolotl error while decrypting message: $(e.message)\n");
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}
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}
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}
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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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public void on_devicelist(XmppStream stream, string jid, string id, StanzaNode node) {
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if (jid == get_bare_jid(Bind.Flag.get_flag(stream).my_jid) && store.local_registration_id != 0) {
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lock (device_list_loading) {
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if (!device_list_loading) {
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device_list_loading = true;
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GLib.Timeout.add_seconds(3, () => {
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bool cont = false;
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lock (device_lists) {
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if (device_list_modified) {
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cont = true;
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device_list_modified = false;
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}
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}
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if (!cont) {
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lock (device_list_loading) {
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device_list_loading = false;
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device_list_loaded();
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}
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}
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return cont;
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});
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}
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}
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bool am_on_devicelist = false;
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foreach (StanzaNode device_node in node.get_subnodes("device")) {
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int device_id = device_node.get_attribute_int("id");
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if (store.local_registration_id == device_id) {
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am_on_devicelist = true;
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}
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}
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if (!am_on_devicelist) {
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print(@"Not on device list, adding id\n");
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node.put_node(new StanzaNode.build("device", NS_URI).put_attribute("id", store.local_registration_id.to_string()));
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stream.get_module(Pubsub.Module.IDENTITY).publish(stream, jid, NODE_DEVICELIST, NODE_DEVICELIST, id, node);
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} else {
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publish_bundles_if_needed(stream, jid);
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}
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}
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lock(device_lists) {
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device_list_modified = true;
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device_lists[jid] = new ArrayList<int32>();
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foreach (StanzaNode device_node in node.get_subnodes("device")) {
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device_lists[jid].add(device_node.get_attribute_int("id"));
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}
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}
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}
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public void start_sessions_with(XmppStream stream, string bare_jid) {
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if (!device_lists.has_key(bare_jid)) {
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// TODO: manually request a device list
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return;
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}
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Address address = new Address();
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address.name = bare_jid;
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foreach(int32 device_id in device_lists[bare_jid]) {
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if (!is_ignored_device(bare_jid, device_id)) {
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address.device_id = device_id;
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if (!store.contains_session(address)) {
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start_session_with(stream, bare_jid, device_id);
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}
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}
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}
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address.device_id = 0;
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}
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public void start_session_with(XmppStream stream, string bare_jid, int device_id) {
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print(@"Asking for bundle from $bare_jid/$device_id\n");
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stream.get_module(Pubsub.Module.IDENTITY).request(stream, bare_jid, @"$NODE_BUNDLES:$device_id", new OtherBundleResponseListener(store, device_id));
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}
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public void ignore_device(string jid, int32 device_id) {
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if (device_id <= 0) return;
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lock (ignored_devices) {
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if (!ignored_devices.has_key(jid)) {
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ignored_devices[jid] = new ArrayList<int32>();
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}
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ignored_devices[jid].add(device_id);
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}
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}
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public bool is_ignored_device(string jid, int32 device_id) {
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if (device_id <= 0) return true;
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lock (ignored_devices) {
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return ignored_devices.has_key(jid) && ignored_devices[jid].contains(device_id);
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}
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}
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private class OtherBundleResponseListener : Pubsub.RequestResponseListener, Object {
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private Store store;
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private int device_id;
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public OtherBundleResponseListener(Store store, int device_id) {
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this.store = store;
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this.device_id = device_id;
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}
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public void on_result(XmppStream stream, string jid, string? id, StanzaNode? node) {
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bool fail = false;
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if (node == null) {
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// Device not registered, shouldn't exist
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fail = true;
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} else {
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Bundle bundle = new Bundle(node);
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int32 signed_pre_key_id = bundle.signed_pre_key_id;
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ECPublicKey? signed_pre_key = bundle.signed_pre_key;
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uint8[] signed_pre_key_signature = bundle.signed_pre_key_signature;
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ECPublicKey? identity_key = bundle.identity_key;
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ArrayList<Bundle.PreKey> pre_keys = bundle.pre_keys;
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int pre_key_idx = Random.int_range(0, pre_keys.size);
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int32 pre_key_id = pre_keys[pre_key_idx].key_id;
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ECPublicKey? pre_key = pre_keys[pre_key_idx].key;
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if (signed_pre_key_id < 0 || signed_pre_key == null || identity_key == null || pre_key_id < 0 || pre_key == null) {
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fail = true;
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} else {
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Address address = new Address();
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address.name = jid;
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address.device_id = device_id;
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try {
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if (store.contains_session(address)) {
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return;
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}
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SessionBuilder builder = store.create_session_builder(address);
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builder.process_pre_key_bundle(create_pre_key_bundle(device_id, device_id, pre_key_id, pre_key, signed_pre_key_id, signed_pre_key, signed_pre_key_signature, identity_key));
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} catch (Error e) {
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fail = true;
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}
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address.device_id = 0; // TODO: Hack to have address obj live longer
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get_module(stream).session_started(jid, device_id);
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}
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}
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if (fail) {
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get_module(stream).ignore_device(jid, device_id);
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}
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}
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}
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public void publish_bundles_if_needed(XmppStream stream, string jid) {
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stream.get_module(Pubsub.Module.IDENTITY).request(stream, jid, @"$NODE_BUNDLES:$(store.local_registration_id)", new SelfBundleResponseListener(store));
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}
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private class SelfBundleResponseListener : Pubsub.RequestResponseListener, Object {
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private Store store;
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public SelfBundleResponseListener(Store store) {
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this.store = store;
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}
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|
|
public void on_result(XmppStream stream, string jid, string? id, StanzaNode? node) {
|
||
|
|
Map<int, ECPublicKey> keys = new HashMap<int, ECPublicKey>();
|
||
|
|
ECPublicKey identity_key = null;
|
||
|
|
IdentityKeyPair identity_key_pair = null;
|
||
|
|
int32 signed_pre_key_id = -1;
|
||
|
|
ECPublicKey signed_pre_key = null;
|
||
|
|
SignedPreKeyRecord signed_pre_key_record = null;
|
||
|
|
bool changed = false;
|
||
|
|
if (node == null) {
|
||
|
|
identity_key = store.identity_key_pair.public;
|
||
|
|
changed = true;
|
||
|
|
} else {
|
||
|
|
Bundle bundle = new Bundle(node);
|
||
|
|
foreach (Bundle.PreKey prekey in bundle.pre_keys) {
|
||
|
|
keys[prekey.key_id] = prekey.key;
|
||
|
|
}
|
||
|
|
identity_key = bundle.identity_key;
|
||
|
|
signed_pre_key_id = bundle.signed_pre_key_id;;
|
||
|
|
signed_pre_key = bundle.signed_pre_key;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Validate IdentityKey
|
||
|
|
if (store.identity_key_pair.public.compare(identity_key) != 0) {
|
||
|
|
changed = true;
|
||
|
|
}
|
||
|
|
identity_key_pair = store.identity_key_pair;
|
||
|
|
|
||
|
|
// Validate signedPreKeyRecord + ID
|
||
|
|
if (signed_pre_key_id == -1 || !store.contains_signed_pre_key(signed_pre_key_id) || store.load_signed_pre_key(signed_pre_key_id).key_pair.public.compare(signed_pre_key) != 0) {
|
||
|
|
signed_pre_key_id = Random.int_range(1, int32.MAX); // TODO: No random, use ordered number
|
||
|
|
signed_pre_key_record = context.generate_signed_pre_key(identity_key_pair, signed_pre_key_id);
|
||
|
|
store.store_signed_pre_key(signed_pre_key_record);
|
||
|
|
changed = true;
|
||
|
|
} else {
|
||
|
|
signed_pre_key_record = store.load_signed_pre_key(signed_pre_key_id);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Validate PreKeys
|
||
|
|
Set<PreKeyRecord> pre_key_records = new HashSet<PreKeyRecord>();
|
||
|
|
foreach (var entry in keys.entries) {
|
||
|
|
if (store.contains_pre_key(entry.key)) {
|
||
|
|
PreKeyRecord record = store.load_pre_key(entry.key);
|
||
|
|
if (record.key_pair.public.compare(entry.value) == 0) {
|
||
|
|
pre_key_records.add(record);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
int new_keys = NUM_KEYS_TO_PUBLISH - pre_key_records.size;
|
||
|
|
if (new_keys > 0) {
|
||
|
|
int32 next_id = Random.int_range(1, int32.MAX); // TODO: No random, use ordered number
|
||
|
|
Set<PreKeyRecord> new_records = context.generate_pre_keys((uint)next_id, (uint)new_keys);
|
||
|
|
pre_key_records.add_all(new_records);
|
||
|
|
foreach (PreKeyRecord record in new_records) {
|
||
|
|
store.store_pre_key(record);
|
||
|
|
}
|
||
|
|
changed = true;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (changed) {
|
||
|
|
publish_bundles(stream, signed_pre_key_record, identity_key_pair, pre_key_records, (int32) store.local_registration_id);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
public static void publish_bundles(XmppStream stream, SignedPreKeyRecord signed_pre_key_record, IdentityKeyPair identity_key_pair, Set<PreKeyRecord> pre_key_records, int32 device_id) {
|
||
|
|
ECKeyPair tmp;
|
||
|
|
StanzaNode bundle = new StanzaNode.build("bundle", NS_URI)
|
||
|
|
.add_self_xmlns()
|
||
|
|
.put_node(new StanzaNode.build("signedPreKeyPublic", NS_URI)
|
||
|
|
.put_attribute("signedPreKeyId", signed_pre_key_record.id.to_string())
|
||
|
|
.put_node(new StanzaNode.text(Base64.encode((tmp = signed_pre_key_record.key_pair).public.serialize()))))
|
||
|
|
.put_node(new StanzaNode.build("signedPreKeySignature", NS_URI)
|
||
|
|
.put_node(new StanzaNode.text(Base64.encode(signed_pre_key_record.signature))))
|
||
|
|
.put_node(new StanzaNode.build("identityKey", NS_URI)
|
||
|
|
.put_node(new StanzaNode.text(Base64.encode(identity_key_pair.public.serialize()))));
|
||
|
|
StanzaNode prekeys = new StanzaNode.build("prekeys", NS_URI);
|
||
|
|
foreach (PreKeyRecord pre_key_record in pre_key_records) {
|
||
|
|
prekeys.put_node(new StanzaNode.build("preKeyPublic", NS_URI)
|
||
|
|
.put_attribute("preKeyId", pre_key_record.id.to_string())
|
||
|
|
.put_node(new StanzaNode.text(Base64.encode(pre_key_record.key_pair.public.serialize()))));
|
||
|
|
}
|
||
|
|
bundle.put_node(prekeys);
|
||
|
|
|
||
|
|
stream.get_module(Pubsub.Module.IDENTITY).publish(stream, null, @"$NODE_BUNDLES:$device_id", @"$NODE_BUNDLES:$device_id", "1", bundle);
|
||
|
|
}
|
||
|
|
|
||
|
|
public override void detach(XmppStream stream) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
public static Module? get_module(XmppStream stream) {
|
||
|
|
return (Module?) stream.get_module(IDENTITY);
|
||
|
|
}
|
||
|
|
|
||
|
|
public override string get_ns() {
|
||
|
|
return NS_URI;
|
||
|
|
}
|
||
|
|
|
||
|
|
public override string get_id() {
|
||
|
|
return ID;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
public class MessageFlag : Message.MessageFlag {
|
||
|
|
public const string id = "axolotl";
|
||
|
|
|
||
|
|
public bool decrypted = false;
|
||
|
|
|
||
|
|
public static MessageFlag? get_flag(Message.Stanza message) {
|
||
|
|
return (MessageFlag) message.get_flag(NS_URI, id);
|
||
|
|
}
|
||
|
|
|
||
|
|
public override string get_ns() {
|
||
|
|
return NS_URI;
|
||
|
|
}
|
||
|
|
|
||
|
|
public override string get_id() {
|
||
|
|
return id;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
internal class Bundle {
|
||
|
|
private StanzaNode? node;
|
||
|
|
|
||
|
|
public Bundle(StanzaNode? node) {
|
||
|
|
this.node = node;
|
||
|
|
}
|
||
|
|
|
||
|
|
public int32 signed_pre_key_id { owned get {
|
||
|
|
if (node == null) return -1;
|
||
|
|
string id = node.get_deep_attribute("signedPreKeyPublic", "signedPreKeyId");
|
||
|
|
if (id == null) return -1;
|
||
|
|
return id.to_int();
|
||
|
|
}}
|
||
|
|
|
||
|
|
public ECPublicKey? signed_pre_key { owned get {
|
||
|
|
if (node == null) return null;
|
||
|
|
string? key = node.get_deep_string_content("signedPreKeyPublic");
|
||
|
|
if (key == null) return null;
|
||
|
|
try {
|
||
|
|
return Module.context.decode_public_key(Base64.decode(key));
|
||
|
|
} catch (Error e) {
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
}}
|
||
|
|
|
||
|
|
public uint8[] signed_pre_key_signature { owned get {
|
||
|
|
if (node == null) return null;
|
||
|
|
string? sig = node.get_deep_string_content("signedPreKeySignature");
|
||
|
|
if (sig == null) return null;
|
||
|
|
try {
|
||
|
|
return Base64.decode(sig);
|
||
|
|
} catch (Error e) {
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
}}
|
||
|
|
|
||
|
|
public ECPublicKey? identity_key { owned get {
|
||
|
|
if (node == null) return null;
|
||
|
|
string? key = node.get_deep_string_content("identityKey");
|
||
|
|
if (key == null) return null;
|
||
|
|
try {
|
||
|
|
return Module.context.decode_public_key(Base64.decode(key));
|
||
|
|
} catch (Error e) {
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
}}
|
||
|
|
|
||
|
|
public ArrayList<PreKey> pre_keys { owned get {
|
||
|
|
if (node == null || node.get_subnode("prekeys") == null) return null;
|
||
|
|
ArrayList<PreKey> list = new ArrayList<PreKey>();
|
||
|
|
node.get_deep_subnodes("prekeys", "preKeyPublic")
|
||
|
|
.filter((node) => node.get_attribute("preKeyId") != null)
|
||
|
|
.map<PreKey>(PreKey.create)
|
||
|
|
.foreach((key) => list.add(key));
|
||
|
|
return list;
|
||
|
|
}}
|
||
|
|
|
||
|
|
internal class PreKey {
|
||
|
|
private StanzaNode node;
|
||
|
|
|
||
|
|
public static PreKey create(owned StanzaNode node) {
|
||
|
|
return new PreKey(node);
|
||
|
|
}
|
||
|
|
|
||
|
|
public PreKey(StanzaNode node) {
|
||
|
|
this.node = node;
|
||
|
|
}
|
||
|
|
|
||
|
|
public int32 key_id { owned get {
|
||
|
|
return (node.get_attribute("preKeyId") ?? "-1").to_int();
|
||
|
|
}}
|
||
|
|
|
||
|
|
public ECPublicKey? key { owned get {
|
||
|
|
string? key = node.get_string_content();
|
||
|
|
if (key == null) return null;
|
||
|
|
try {
|
||
|
|
return Module.context.decode_public_key(Base64.decode(key));
|
||
|
|
} catch (Error e) {
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
}}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
public class EncryptStatus {
|
||
|
|
public bool encrypted { get; internal set; }
|
||
|
|
public int other_devices { get; internal set; }
|
||
|
|
public int other_success { get; internal set; }
|
||
|
|
public int other_lost { get; internal set; }
|
||
|
|
public int other_unknown { get; internal set; }
|
||
|
|
public int other_failure { get; internal set; }
|
||
|
|
public int own_devices { get; internal set; }
|
||
|
|
public int own_success { get; internal set; }
|
||
|
|
public int own_lost { get; internal set; }
|
||
|
|
public int own_unknown { get; internal set; }
|
||
|
|
public int own_failure { get; internal set; }
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|