diff options
Diffstat (limited to 'plugins/omemo/src/file_transfer/file_provider.vala')
| -rw-r--r-- | plugins/omemo/src/file_transfer/file_provider.vala | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/plugins/omemo/src/file_transfer/file_provider.vala b/plugins/omemo/src/file_transfer/file_provider.vala new file mode 100644 index 00000000..938ec0cf --- /dev/null +++ b/plugins/omemo/src/file_transfer/file_provider.vala @@ -0,0 +1,168 @@ +using Gee; +using Gtk; + +using Dino.Entities; +using Xmpp; +using Signal; + +namespace Dino.Plugins.Omemo { + +public class FileProvider : Dino.FileProvider, Object { + public string id { get { return "aesgcm"; } } + + private StreamInteractor stream_interactor; + private Dino.Database dino_db; + private Regex url_regex; + + public FileProvider(StreamInteractor stream_interactor, Dino.Database dino_db) { + this.stream_interactor = stream_interactor; + this.dino_db = dino_db; + this.url_regex = /^aesgcm:\/\/(.*)#(([A-Fa-f0-9]{2}){48}|([A-Fa-f0-9]{2}){44})$/; + + stream_interactor.get_module(MessageProcessor.IDENTITY).received_pipeline.connect(new ReceivedMessageListener(this)); + } + + private class ReceivedMessageListener : MessageListener { + + public string[] after_actions_const = new string[]{ "STORE" }; + public override string action_group { get { return ""; } } + public override string[] after_actions { get { return after_actions_const; } } + + private FileProvider outer; + private StreamInteractor stream_interactor; + + public ReceivedMessageListener(FileProvider outer) { + this.outer = outer; + this.stream_interactor = outer.stream_interactor; + } + + public override async bool run(Entities.Message message, Xmpp.MessageStanza stanza, Conversation conversation) { + if (message.body.has_prefix("aesgcm://") && outer.url_regex.match(message.body)) { + yield outer.on_file_message(message, conversation); + } + return false; + } + } + + private async void on_file_message(Entities.Message message, Conversation conversation) { + MatchInfo match_info; + this.url_regex.match(message.body, 0, out match_info); + string url_without_hash = match_info.fetch(1); + + FileTransfer file_transfer = new FileTransfer(); + file_transfer.account = conversation.account; + file_transfer.counterpart = message.counterpart; + file_transfer.ourpart = message.ourpart; + file_transfer.encryption = Encryption.NONE; + file_transfer.time = message.time; + file_transfer.local_time = message.local_time; + file_transfer.direction = message.direction; + file_transfer.file_name = url_without_hash.substring(url_without_hash.last_index_of("/") + 1); + file_transfer.size = -1; + file_transfer.state = FileTransfer.State.NOT_STARTED; + file_transfer.provider = 0; + file_transfer.info = message.id.to_string(); + + if (stream_interactor.get_module(FileManager.IDENTITY).is_sender_trustworthy(file_transfer, conversation)) { + yield get_meta_info(file_transfer); + if (file_transfer.size >= 0 && file_transfer.size < 5000000) { + ContentItem? content_item = stream_interactor.get_module(ContentItemStore.IDENTITY).get_item(conversation, 1, message.id); + if (content_item != null) { + stream_interactor.get_module(ContentItemStore.IDENTITY).set_item_hide(content_item, true); + } + } + file_incoming(file_transfer, conversation); + } + } + + public async void get_meta_info(FileTransfer file_transfer) { + string url_body = dino_db.message.select({dino_db.message.body}).with(dino_db.message.id, "=", int.parse(file_transfer.info))[dino_db.message.body]; + string url = this.aesgcm_to_https_link(url_body); + var session = new Soup.Session(); + var head_message = new Soup.Message("HEAD", url); + if (head_message != null) { + yield session.send_async(head_message, null); + + if (head_message.status_code >= 200 && head_message.status_code < 300) { + string? content_type = null, content_length = null; + head_message.response_headers.foreach((name, val) => { + if (name == "Content-Type") content_type = val; + if (name == "Content-Length") content_length = val; + }); + file_transfer.mime_type = content_type; + if (content_length != null) { + file_transfer.size = int.parse(content_length); + } + } else { + warning("HTTP HEAD download status code " + head_message.status_code.to_string()); + } + } + } + + public async void download(FileTransfer file_transfer, File file) { + try { + string url_body = dino_db.message.select({dino_db.message.body}).with(dino_db.message.id, "=", int.parse(file_transfer.info))[dino_db.message.body]; + string url = this.aesgcm_to_https_link(url_body); + var session = new Soup.Session(); + Soup.Request request = session.request(url); + + file_transfer.input_stream = yield decrypt_file(yield request.send_async(null), url_body); + file_transfer.encryption = Encryption.OMEMO; + + OutputStream os = file.create(FileCreateFlags.REPLACE_DESTINATION); + yield os.splice_async(file_transfer.input_stream, 0); + os.close(); + file_transfer.path = file.get_basename(); + file_transfer.input_stream = yield file.read_async(); + + file_transfer.state = FileTransfer.State.COMPLETE; + } catch (Error e) { + file_transfer.state = FileTransfer.State.FAILED; + } + } + + public async InputStream? decrypt_file(InputStream input_stream, string url) { + // Decode IV and key + MatchInfo match_info; + this.url_regex.match(url, 0, out match_info); + uint8[] iv_and_key = hex_to_bin(match_info.fetch(2).up()); + uint8[] iv, key; + if (iv_and_key.length == 44) { + iv = iv_and_key[0:12]; + key = iv_and_key[12:44]; + } else { + iv = iv_and_key[0:16]; + key = iv_and_key[16:48]; + } + + // Read data + uint8[] buf = new uint8[256]; + Array<uint8> data = new Array<uint8>(false, true, 0); + size_t len = -1; + do { + len = yield input_stream.read_async(buf); + data.append_vals(buf, (uint) len); + } while(len > 0); + + // Decrypt + uint8[] cleartext = Signal.aes_decrypt(Cipher.AES_GCM_NOPADDING, key, iv, data.data); + return new MemoryInputStream.from_data(cleartext); + } + + private uint8[] hex_to_bin(string hex) { + uint8[] bin = new uint8[hex.length / 2]; + const string HEX = "0123456789ABCDEF"; + for (int i = 0; i < hex.length / 2; i++) { + bin[i] = (uint8) (HEX.index_of_char(hex[i*2]) << 4) | HEX.index_of_char(hex[i*2+1]); + } + return bin; + } + + private string aesgcm_to_https_link(string aesgcm_link) { + MatchInfo match_info; + this.url_regex.match(aesgcm_link, 0, out match_info); + return "https://" + match_info.fetch(1); + } +} + +} |