Mercurial > libervia-backend
view sat/plugins/plugin_sec_aesgcm.py @ 3836:e183f1fbfa8d
doc (cli/pubsub): add doc for ``reference`` subcommand:
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author | Goffi <goffi@goffi.org> |
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date | Sun, 10 Jul 2022 16:15:09 +0200 (2022-07-10) |
parents | be6d91572633 |
children | 3ef988734869 |
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#!/usr/bin/env python3 # SàT plugin for handling AES-GCM file encryption # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org) # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU Affero General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU Affero General Public License for more details. # You should have received a copy of the GNU Affero General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. import re from textwrap import dedent from functools import partial from urllib import parse import mimetypes import secrets from cryptography.hazmat.primitives import ciphers from cryptography.hazmat.primitives.ciphers import modes from cryptography.hazmat import backends from cryptography.exceptions import AlreadyFinalized import treq from twisted.internet import defer from sat.core.i18n import _ from sat.core.constants import Const as C from sat.core import exceptions from sat.tools import stream from sat.core.log import getLogger from sat.tools.web import treq_client_no_ssl log = getLogger(__name__) PLUGIN_INFO = { C.PI_NAME: "AES-GCM", C.PI_IMPORT_NAME: "AES-GCM", C.PI_TYPE: "SEC", C.PI_PROTOCOLS: ["OMEMO Media sharing"], C.PI_DEPENDENCIES: ["XEP-0363", "XEP-0384", "DOWNLOAD", "ATTACH"], C.PI_MAIN: "AESGCM", C.PI_HANDLER: "no", C.PI_DESCRIPTION: dedent(_("""\ Implementation of AES-GCM scheme, a way to encrypt files (not official XMPP standard). See https://xmpp.org/extensions/inbox/omemo-media-sharing.html for details """)), } AESGCM_RE = re.compile( r'aesgcm:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9' r'()@:%_\+.~#?&\/\/=]*)') class AESGCM(object): def __init__(self, host): self.host = host log.info(_("AESGCM plugin initialization")) self._http_upload = host.plugins['XEP-0363'] self._attach = host.plugins["ATTACH"] host.plugins["DOWNLOAD"].registerScheme( "aesgcm", self.download ) self._attach.register( self.canHandleAttachment, self.attach, encrypted=True) host.trigger.add("XEP-0363_upload_size", self._uploadSizeTrigger) host.trigger.add("XEP-0363_upload", self._uploadTrigger) host.trigger.add("messageReceived", self._messageReceivedTrigger) async def download(self, client, uri_parsed, dest_path, options): fragment = bytes.fromhex(uri_parsed.fragment) # legacy method use 16 bits IV, but OMEMO media sharing published spec indicates # which is 12 bits IV (AES-GCM spec recommandation), so we have to determine # which size has been used. if len(fragment) == 48: iv_size = 16 elif len(fragment) == 44: iv_size = 12 else: raise ValueError( f"Invalid URL fragment, can't decrypt file at {uri_parsed.get_url()}") iv, key = fragment[:iv_size], fragment[iv_size:] decryptor = ciphers.Cipher( ciphers.algorithms.AES(key), modes.GCM(iv), backend=backends.default_backend(), ).decryptor() download_url = parse.urlunparse( ('https', uri_parsed.netloc, uri_parsed.path, '', '', '')) if options.get('ignore_tls_errors', False): log.warning( "TLS certificate check disabled, this is highly insecure" ) treq_client = treq_client_no_ssl else: treq_client = treq head_data = await treq_client.head(download_url) content_length = int(head_data.headers.getRawHeaders('content-length')[0]) # the 128 bits tag is put at the end file_size = content_length - 16 file_obj = stream.SatFile( self.host, client, dest_path, mode="wb", size = file_size, ) progress_id = file_obj.uid resp = await treq_client.get(download_url, unbuffered=True) if resp.code == 200: d = treq.collect(resp, partial( self.onDataDownload, client=client, file_obj=file_obj, decryptor=decryptor)) else: d = defer.Deferred() self.host.plugins["DOWNLOAD"].errbackDownload(file_obj, d, resp) return progress_id, d async def canHandleAttachment(self, client, data): try: await self._http_upload.getHTTPUploadEntity(client) except exceptions.NotFound: return False else: return True async def _uploadCb(self, client, filepath, filename, options): options['encryption'] = C.ENC_AES_GCM return await self._http_upload.fileHTTPUpload( client=client, filepath=filepath, filename=filename, options=options ) async def attach(self, client, data): # XXX: the attachment removal/resend code below is due to the one file per # message limitation of OMEMO media sharing unofficial XEP. We have to remove # attachments from original message, and send them one by one. # TODO: this is to be removed when a better mechanism is available with OMEMO (now # possible with the 0.4 version of OMEMO, it's possible to encrypt other stanza # elements than body). attachments = data["extra"][C.MESS_KEY_ATTACHMENTS] if not data['message'] or data['message'] == {'': ''}: extra_attachments = attachments[1:] del attachments[1:] await self._attach.uploadFiles(client, data, upload_cb=self._uploadCb) else: # we have a message, we must send first attachment separately extra_attachments = attachments[:] attachments.clear() del data["extra"][C.MESS_KEY_ATTACHMENTS] body_elt = next(data["xml"].elements((C.NS_CLIENT, "body"))) for attachment in attachments: body_elt.addContent(attachment["url"]) for attachment in extra_attachments: # we send all remaining attachment in a separate message await client.sendMessage( to_jid=data['to'], message={'': ''}, subject=data['subject'], mess_type=data['type'], extra={C.MESS_KEY_ATTACHMENTS: [attachment]}, ) if ((not data['extra'] and (not data['message'] or data['message'] == {'': ''}) and not data['subject'])): # nothing left to send, we can cancel the message raise exceptions.CancelError("Cancelled by AESGCM attachment handling") def onDataDownload(self, data, client, file_obj, decryptor): if file_obj.tell() + len(data) > file_obj.size: # we're reaching end of file with this bunch of data # we may still have a last bunch if the tag is incomplete bytes_left = file_obj.size - file_obj.tell() if bytes_left > 0: decrypted = decryptor.update(data[:bytes_left]) file_obj.write(decrypted) tag = data[bytes_left:] else: tag = data if len(tag) < 16: # the tag is incomplete, either we'll get the rest in next data bunch # or we have already the other part from last bunch of data try: # we store partial tag in decryptor._sat_tag tag = decryptor._sat_tag + tag except AttributeError: # no other part, we'll get the rest at next bunch decryptor.sat_tag = tag else: # we have the complete tag, it must be 128 bits if len(tag) != 16: raise ValueError(f"Invalid tag: {tag}") remain = decryptor.finalize_with_tag(tag) file_obj.write(remain) file_obj.close() else: decrypted = decryptor.update(data) file_obj.write(decrypted) def _uploadSizeTrigger(self, client, options, file_path, size, size_adjust): if options.get('encryption') != C.ENC_AES_GCM: return True # the tag is appended to the file size_adjust.append(16) return True def _encrypt(self, data, encryptor): if data: return encryptor.update(data) else: try: # end of file is reached, me must finalize ret = encryptor.finalize() tag = encryptor.tag return ret + tag except AlreadyFinalized: # as we have already finalized, we can now send EOF return b'' def _uploadTrigger(self, client, options, sat_file, file_producer, slot): if options.get('encryption') != C.ENC_AES_GCM: return True log.debug("encrypting file with AES-GCM") iv = secrets.token_bytes(12) key = secrets.token_bytes(32) fragment = f'{iv.hex()}{key.hex()}' ori_url = parse.urlparse(slot.get) # we change the get URL with the one with aesgcm scheme and containing the # encoded key + iv slot.get = parse.urlunparse(['aesgcm', *ori_url[1:5], fragment]) # encrypted data size will be bigger than original file size # so we need to check with final data length to avoid a warning on close() sat_file.check_size_with_read = True # file_producer get length directly from file, and this cause trouble has # we have to change the size because of encryption. So we adapt it here, # else the producer would stop reading prematurely file_producer.length = sat_file.size encryptor = ciphers.Cipher( ciphers.algorithms.AES(key), modes.GCM(iv), backend=backends.default_backend(), ).encryptor() if sat_file.data_cb is not None: raise exceptions.InternalError( f"data_cb was expected to be None, it is set to {sat_file.data_cb}") # with data_cb we encrypt the file on the fly sat_file.data_cb = partial(self._encrypt, encryptor=encryptor) return True def _popAESGCMLinks(self, match, links): link = match.group() if link not in links: links.append(link) return "" def _checkAESGCMAttachments(self, client, data): if not data.get('message'): return data links = [] for lang, message in list(data['message'].items()): message = AESGCM_RE.sub( partial(self._popAESGCMLinks, links=links), message) if links: message = message.strip() if not message: del data['message'][lang] else: data['message'][lang] = message mess_encrypted = client.encryption.isEncrypted(data) attachments = data['extra'].setdefault(C.MESS_KEY_ATTACHMENTS, []) for link in links: path = parse.urlparse(link).path attachment = { "url": link, } media_type = mimetypes.guess_type(path, strict=False)[0] if media_type is not None: attachment[C.MESS_KEY_ATTACHMENTS_MEDIA_TYPE] = media_type if mess_encrypted: # we don't add the encrypted flag if the message itself is not # encrypted, because the decryption key is part of the link, # so sending it over unencrypted channel is like having no # encryption at all. attachment['encrypted'] = True attachments.append(attachment) return data def _messageReceivedTrigger(self, client, message_elt, post_treat): # we use a post_treat callback instead of "message_parse" trigger because we need # to check if the "encrypted" flag is set to decide if we add the same flag to the # attachment post_treat.addCallback(partial(self._checkAESGCMAttachments, client)) return True