diff options
Diffstat (limited to 'plugins/omemo/src/trust_manager.vala')
| -rw-r--r-- | plugins/omemo/src/trust_manager.vala | 92 |
1 files changed, 75 insertions, 17 deletions
diff --git a/plugins/omemo/src/trust_manager.vala b/plugins/omemo/src/trust_manager.vala index 495d2657..8f6e9017 100644 --- a/plugins/omemo/src/trust_manager.vala +++ b/plugins/omemo/src/trust_manager.vala @@ -168,27 +168,85 @@ public class TrustManager { } public override async bool run(Entities.Message message, Xmpp.MessageStanza stanza, Conversation conversation) { - MessageFlag? flag = MessageFlag.get_flag(stanza); - if(flag != null && ((!)flag).decrypted) { - int identity_id = db.identity.get_id(conversation.account.id); - if (identity_id < 0) return false; - StanzaNode header = stanza.stanza.get_subnode("encrypted", "eu.siacs.conversations.axolotl").get_subnode("header"); - Jid jid = message.from; - if(conversation.type_ == Conversation.Type.GROUPCHAT) { - jid = stream_interactor.get_module(MucManager.IDENTITY).get_real_jid(jid, conversation.account); - } - 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]; - if (trust_level == Database.IdentityMetaTable.TrustLevel.UNTRUSTED) { - message.body = _("OMEMO message from a rejected device"); - message.marked = Message.Marked.WONTSEND; - } - if (trust_level == Database.IdentityMetaTable.TrustLevel.UNKNOWN) { - message.body = _("OMEMO message from an unknown device: ")+message.body; - message.marked = Message.Marked.WONTSEND; + Store store = stream_interactor.module_manager.get_module(conversation.account, StreamModule.IDENTITY).store; + + StanzaNode? _encrypted = stanza.stanza.get_subnode("encrypted", NS_URI); + if (_encrypted == null || MessageFlag.get_flag(stanza) != null || stanza.from == null) return false; + StanzaNode encrypted = (!)_encrypted; + if (!Plugin.ensure_context()) return false; + MessageFlag flag = new MessageFlag(); + stanza.add_flag(flag); + StanzaNode? _header = encrypted.get_subnode("header"); + if (_header == null) return false; + StanzaNode header = (!)_header; + if (header.get_attribute_int("sid") <= 0) return false; + foreach (StanzaNode key_node in header.get_subnodes("key")) { + if (key_node.get_attribute_int("rid") == store.local_registration_id) { + try { + string? payload = encrypted.get_deep_string_content("payload"); + string? iv_node = header.get_deep_string_content("iv"); + string? key_node_content = key_node.get_string_content(); + if (payload == null || iv_node == null || key_node_content == null) continue; + uint8[] key; + uint8[] ciphertext = Base64.decode((!)payload); + uint8[] iv = Base64.decode((!)iv_node); + Jid jid = stanza.from; + if (conversation.type_ == Conversation.Type.GROUPCHAT) { + jid = stream_interactor.get_module(MucManager.IDENTITY).get_real_jid(jid, conversation.account); + } + + Address address = new Address(jid.bare_jid.to_string(), header.get_attribute_int("sid")); + if (key_node.get_attribute_bool("prekey")) { + PreKeySignalMessage msg = 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 = 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 + + if (key.length >= 32) { + int authtaglength = key.length - 16; + uint8[] new_ciphertext = new uint8[ciphertext.length + authtaglength]; + uint8[] new_key = new uint8[16]; + Memory.copy(new_ciphertext, ciphertext, ciphertext.length); + Memory.copy((uint8*)new_ciphertext + ciphertext.length, (uint8*)key + 16, authtaglength); + Memory.copy(new_key, key, 16); + ciphertext = new_ciphertext; + key = new_key; + } + + message.body = arr_to_str(aes_decrypt(Cipher.AES_GCM_NOPADDING, key, iv, ciphertext)); + flag.decrypted = true; + + int identity_id = db.identity.get_id(conversation.account.id); + if (identity_id < 0) return false; + + 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]; + if (trust_level == Database.IdentityMetaTable.TrustLevel.UNTRUSTED) { + message.body = _("OMEMO message from a rejected device"); + message.marked = Message.Marked.WONTSEND; + } + if (trust_level == Database.IdentityMetaTable.TrustLevel.UNKNOWN) { + message.body = _("OMEMO message from an unknown device: ")+message.body; + message.marked = Message.Marked.WONTSEND; + } + } catch (Error e) { + if (Plugin.DEBUG) print(@"OMEMO: Signal error while decrypting message: $(e.message)\n"); + } } } return false; } + + private string arr_to_str(uint8[] arr) { + // null-terminate the array + uint8[] rarr = new uint8[arr.length+1]; + Memory.copy(rarr, arr, arr.length); + return (string)rarr; + } } } |