diff options
Diffstat (limited to 'src/leap/bitmask/keymanager')
| -rw-r--r-- | src/leap/bitmask/keymanager/__init__.py | 842 | ||||
| -rw-r--r-- | src/leap/bitmask/keymanager/_version.py | 484 | ||||
| -rw-r--r-- | src/leap/bitmask/keymanager/documents.py | 101 | ||||
| -rw-r--r-- | src/leap/bitmask/keymanager/errors.py | 119 | ||||
| -rw-r--r-- | src/leap/bitmask/keymanager/keys.py | 290 | ||||
| -rw-r--r-- | src/leap/bitmask/keymanager/migrator.py | 167 | ||||
| -rw-r--r-- | src/leap/bitmask/keymanager/openpgp.py | 881 | ||||
| -rw-r--r-- | src/leap/bitmask/keymanager/validation.py | 129 | ||||
| -rw-r--r-- | src/leap/bitmask/keymanager/wrapper.py | 134 |
9 files changed, 3147 insertions, 0 deletions
diff --git a/src/leap/bitmask/keymanager/__init__.py b/src/leap/bitmask/keymanager/__init__.py new file mode 100644 index 0000000..0b8a5b3 --- /dev/null +++ b/src/leap/bitmask/keymanager/__init__.py @@ -0,0 +1,842 @@ +# -*- coding: utf-8 -*- +# __init__.py +# Copyright (C) 2013 LEAP +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU 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 General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. +""" +Key Manager is a Nicknym agent for LEAP client. +""" +# let's do a little sanity check to see if we're using the wrong gnupg +import fileinput +import os +import sys +import tempfile +import json +import urllib + +from leap.common import ca_bundle +from twisted.web import client +from twisted.web._responses import NOT_FOUND + +from ._version import get_versions + +try: + from gnupg.gnupg import GPGUtilities + assert(GPGUtilities) # pyflakes happy + from gnupg import __version__ as _gnupg_version + if '-' in _gnupg_version: + # avoid Parsing it as LegacyVersion, get just + # the release numbers: + _gnupg_version = _gnupg_version.split('-')[0] + from pkg_resources import parse_version + # We need to make sure that we're not colliding with the infamous + # python-gnupg + assert(parse_version(_gnupg_version) >= parse_version('1.4.0')) + +except (ImportError, AssertionError): + print "*******" + print "Ooops! It looks like there is a conflict in the installed version " + print "of gnupg." + print "GNUPG_VERSION:", _gnupg_version + print + print "Disclaimer: Ideally, we would need to work a patch and propose the " + print "merge to upstream. But until then do: " + print + print "% pip uninstall python-gnupg" + print "% pip install gnupg" + print "*******" + sys.exit(1) + +import logging + +from twisted.internet import defer +from urlparse import urlparse + +from leap.common.check import leap_assert +from leap.common.http import HTTPClient +from leap.common.events import emit_async, catalog +from leap.common.decorators import memoized_method + +from leap.keymanager.errors import ( + KeyNotFound, + KeyNotValidUpgrade, + InvalidSignature +) +from leap.keymanager.validation import ValidationLevels, can_upgrade +from leap.keymanager.openpgp import OpenPGPScheme + +__version__ = get_versions()['version'] +del get_versions + +logger = logging.getLogger(__name__) + + +# +# The Key Manager +# + +class KeyManager(object): + + # + # server's key storage constants + # + + OPENPGP_KEY = 'openpgp' + PUBKEY_KEY = "user[public_key]" + + def __init__(self, address, nickserver_uri, soledad, token=None, + ca_cert_path=None, api_uri=None, api_version=None, uid=None, + gpgbinary=None): + """ + Initialize a Key Manager for user's C{address} with provider's + nickserver reachable in C{nickserver_uri}. + + :param address: The email address of the user of this Key Manager. + :type address: str + :param nickserver_uri: The URI of the nickserver. + :type nickserver_uri: str + :param soledad: A Soledad instance for local storage of keys. + :type soledad: leap.soledad.Soledad + :param token: The token for interacting with the webapp API. + :type token: str + :param ca_cert_path: The path to the CA certificate. + :type ca_cert_path: str + :param api_uri: The URI of the webapp API. + :type api_uri: str + :param api_version: The version of the webapp API. + :type api_version: str + :param uid: The user's UID. + :type uid: str + :param gpgbinary: Name for GnuPG binary executable. + :type gpgbinary: C{str} + """ + self._address = address + self._nickserver_uri = nickserver_uri + self._soledad = soledad + self._token = token + self.ca_cert_path = ca_cert_path + self.api_uri = api_uri + self.api_version = api_version + self.uid = uid + self._openpgp = OpenPGPScheme(soledad, gpgbinary=gpgbinary) + self._combined_ca_bundle = self._create_combined_bundle_file() + self._async_client = HTTPClient(self._combined_ca_bundle) + self._async_client_pinned = HTTPClient(self._ca_cert_path) + + # + # destructor + # + + def __del__(self): + try: + created_tmp_combined_ca_bundle = self._combined_ca_bundle not in \ + [ca_bundle.where(), self._ca_cert_path] + if created_tmp_combined_ca_bundle: + os.remove(self._combined_ca_bundle) + except OSError: + pass + + # + # utilities + # + + def _create_combined_bundle_file(self): + leap_ca_bundle = ca_bundle.where() + + if self._ca_cert_path == leap_ca_bundle: + return self._ca_cert_path # don't merge file with itself + elif not self._ca_cert_path: + return leap_ca_bundle + + tmp_file = tempfile.NamedTemporaryFile(delete=False) + + with open(tmp_file.name, 'w') as fout: + fin = fileinput.input(files=(leap_ca_bundle, self._ca_cert_path)) + for line in fin: + fout.write(line) + fin.close() + + return tmp_file.name + + @defer.inlineCallbacks + def _get_key_from_nicknym(self, address): + """ + Send a GET request to C{uri} containing C{data}. + + :param address: The URI of the request. + :type address: str + + :return: A deferred that will be fired with GET content as json (dict) + :rtype: Deferred + """ + try: + uri = self._nickserver_uri + '?address=' + address + content = yield self._fetch_and_handle_404_from_nicknym(uri, address) + json_content = json.loads(content) + + except KeyNotFound: + raise + except IOError as e: + logger.warning("HTTP error retrieving key: %r" % (e,)) + logger.warning("%s" % (content,)) + raise KeyNotFound(e.message), None, sys.exc_info()[2] + except ValueError as v: + logger.warning("Invalid JSON data from key: %s" % (uri,)) + raise KeyNotFound(v.message + ' - ' + uri), None, sys.exc_info()[2] + + except Exception as e: + logger.warning("Error retrieving key: %r" % (e,)) + raise KeyNotFound(e.message), None, sys.exc_info()[2] + # Responses are now text/plain, although it's json anyway, but + # this will fail when it shouldn't + # leap_assert( + # res.headers['content-type'].startswith('application/json'), + # 'Content-type is not JSON.') + defer.returnValue(json_content) + + def _fetch_and_handle_404_from_nicknym(self, uri, address): + """ + Send a GET request to C{uri} containing C{data}. + + :param uri: The URI of the request. + :type uri: str + :param address: The email corresponding to the key. + :type address: str + + :return: A deferred that will be fired with GET content as json (dict) + :rtype: Deferred + """ + def check_404(response): + if response.code == NOT_FOUND: + message = '%s: %s key not found.' % (response.code, address) + logger.warning(message) + raise KeyNotFound(message), None, sys.exc_info()[2] + return response + + d = self._async_client_pinned.request(str(uri), 'GET', callback=check_404) + d.addCallback(client.readBody) + return d + + @defer.inlineCallbacks + def _get_with_combined_ca_bundle(self, uri, data=None): + """ + Send a GET request to C{uri} containing C{data}. + + Instead of using the ca_cert provided on construction time, this + version also uses the default certificates shipped with leap.common + + :param uri: The URI of the request. + :type uri: str + :param data: The body of the request. + :type data: dict, str or file + + :return: A deferred that will be fired with the GET response + :rtype: Deferred + """ + try: + content = yield self._async_client.request(str(uri), 'GET') + except Exception as e: + logger.warning("There was a problem fetching key: %s" % (e,)) + raise KeyNotFound(uri) + if not content: + raise KeyNotFound(uri) + defer.returnValue(content) + + @defer.inlineCallbacks + def _put(self, uri, data=None): + """ + Send a PUT request to C{uri} containing C{data}. + + The request will be sent using the configured CA certificate path to + verify the server certificate and the configured session id for + authentication. + + :param uri: The URI of the request. + :type uri: str + :param data: The body of the request. + :type data: dict, str or file + + :return: A deferred that will be fired when PUT request finishes + :rtype: Deferred + """ + leap_assert( + self._token is not None, + 'We need a token to interact with webapp!') + if type(data) == dict: + data = urllib.urlencode(data) + headers = {'Authorization': [str('Token token=%s' % self._token)]} + headers['Content-Type'] = ['application/x-www-form-urlencoded'] + try: + res = yield self._async_client_pinned.request(str(uri), 'PUT', + body=str(data), + headers=headers) + except Exception as e: + logger.warning("Error uploading key: %r" % (e,)) + raise e + if 'error' in res: + # FIXME: That's a workaround for 500, + # we need to implement a readBody to assert response code + logger.warning("Error uploading key: %r" % (res,)) + raise Exception(res) + + @memoized_method(invalidation=300) + @defer.inlineCallbacks + def _fetch_keys_from_server(self, address): + """ + Fetch keys bound to address from nickserver and insert them in + local database. + + :param address: The address bound to the keys. + :type address: str + + :return: A Deferred which fires when the key is in the storage, + or which fails with KeyNotFound if the key was not found on + nickserver. + :rtype: Deferred + + """ + # request keys from the nickserver + server_keys = yield self._get_key_from_nicknym(address) + + # insert keys in local database + if self.OPENPGP_KEY in server_keys: + # nicknym server is authoritative for its own domain, + # for other domains the key might come from key servers. + validation_level = ValidationLevels.Weak_Chain + _, domain = _split_email(address) + if (domain == _get_domain(self._nickserver_uri)): + validation_level = ValidationLevels.Provider_Trust + + yield self.put_raw_key( + server_keys['openpgp'], + address=address, + validation=validation_level) + + # + # key management + # + + def send_key(self): + """ + Send user's key to provider. + + Public key bound to user's is sent to provider, which will sign it and + replace any prior keys for the same address in its database. + + :return: A Deferred which fires when the key is sent, or which fails + with KeyNotFound if the key was not found in local database. + :rtype: Deferred + + :raise UnsupportedKeyTypeError: if invalid key type + """ + def send(pubkey): + data = { + self.PUBKEY_KEY: pubkey.key_data + } + uri = "%s/%s/users/%s.json" % ( + self._api_uri, + self._api_version, + self._uid) + d = self._put(uri, data) + d.addCallback(lambda _: + emit_async(catalog.KEYMANAGER_DONE_UPLOADING_KEYS, + self._address)) + return d + + d = self.get_key( + self._address, private=False, fetch_remote=False) + d.addCallback(send) + return d + + def get_key(self, address, private=False, fetch_remote=True): + """ + Return a key bound to address. + + First, search for the key in local storage. If it is not available, + then try to fetch from nickserver. + + :param address: The address bound to the key. + :type address: str + :param private: Look for a private key instead of a public one? + :type private: bool + :param fetch_remote: If key not found in local storage try to fetch + from nickserver + :type fetch_remote: bool + + :return: A Deferred which fires with an EncryptionKey bound to address, + or which fails with KeyNotFound if no key was found neither + locally or in keyserver or fail with KeyVersionError if the + key has a format not supported by this version of KeyManager + :rtype: Deferred + + :raise UnsupportedKeyTypeError: if invalid key type + """ + logger.debug("getting key for %s" % (address,)) + + emit_async(catalog.KEYMANAGER_LOOKING_FOR_KEY, address) + + def key_found(key): + emit_async(catalog.KEYMANAGER_KEY_FOUND, address) + return key + + def key_not_found(failure): + if not failure.check(KeyNotFound): + return failure + + emit_async(catalog.KEYMANAGER_KEY_NOT_FOUND, address) + + # we will only try to fetch a key from nickserver if fetch_remote + # is True and the key is not private. + if fetch_remote is False or private is True: + return failure + + emit_async(catalog.KEYMANAGER_LOOKING_FOR_KEY, address) + d = self._fetch_keys_from_server(address) + d.addCallback( + lambda _: self._openpgp.get_key(address, private=False)) + d.addCallback(key_found) + return d + + # return key if it exists in local database + d = self._openpgp.get_key(address, private=private) + d.addCallbacks(key_found, key_not_found) + return d + + def get_all_keys(self, private=False): + """ + Return all keys stored in local database. + + :param private: Include private keys + :type private: bool + + :return: A Deferred which fires with a list of all keys in local db. + :rtype: Deferred + """ + return self._openpgp.get_all_keys(private) + + def gen_key(self): + """ + Generate a key bound to the user's address. + + :return: A Deferred which fires with the generated EncryptionKey. + :rtype: Deferred + + :raise UnsupportedKeyTypeError: if invalid key type + """ + + def signal_finished(key): + emit_async( + catalog.KEYMANAGER_FINISHED_KEY_GENERATION, self._address) + return key + + emit_async(catalog.KEYMANAGER_STARTED_KEY_GENERATION, self._address) + + d = self._openpgp.gen_key(self._address) + d.addCallback(signal_finished) + return d + + # + # Setters/getters + # + + def _get_token(self): + return self._token + + def _set_token(self, token): + self._token = token + + token = property( + _get_token, _set_token, doc='The session token.') + + def _get_ca_cert_path(self): + return self._ca_cert_path + + def _set_ca_cert_path(self, ca_cert_path): + self._ca_cert_path = ca_cert_path + + ca_cert_path = property( + _get_ca_cert_path, _set_ca_cert_path, + doc='The path to the CA certificate.') + + def _get_api_uri(self): + return self._api_uri + + def _set_api_uri(self, api_uri): + self._api_uri = api_uri + + api_uri = property( + _get_api_uri, _set_api_uri, doc='The webapp API URI.') + + def _get_api_version(self): + return self._api_version + + def _set_api_version(self, api_version): + self._api_version = api_version + + api_version = property( + _get_api_version, _set_api_version, doc='The webapp API version.') + + def _get_uid(self): + return self._uid + + def _set_uid(self, uid): + self._uid = uid + + uid = property( + _get_uid, _set_uid, doc='The uid of the user.') + + # + # encrypt/decrypt and sign/verify API + # + + def encrypt(self, data, address, passphrase=None, sign=None, + cipher_algo='AES256', fetch_remote=True): + """ + Encrypt data with the public key bound to address and sign with with + the private key bound to sign address. + + :param data: The data to be encrypted. + :type data: str + :param address: The address to encrypt it for. + :type address: str + :param passphrase: The passphrase for the secret key used for the + signature. + :type passphrase: str + :param sign: The address to be used for signature. + :type sign: str + :param cipher_algo: The cipher algorithm to use. + :type cipher_algo: str + :param fetch_remote: If key is not found in local storage try to fetch + from nickserver + :type fetch_remote: bool + + :return: A Deferred which fires with the encrypted data as str, or + which fails with KeyNotFound if no keys were found neither + locally or in keyserver or fails with KeyVersionError if the + key format is not supported or fails with EncryptError if + failed encrypting for some reason. + :rtype: Deferred + + :raise UnsupportedKeyTypeError: if invalid key type + """ + + @defer.inlineCallbacks + def encrypt(keys): + pubkey, signkey = keys + encrypted = yield self._openpgp.encrypt( + data, pubkey, passphrase, sign=signkey, + cipher_algo=cipher_algo) + if not pubkey.encr_used: + pubkey.encr_used = True + yield self._openpgp.put_key(pubkey) + defer.returnValue(encrypted) + + dpub = self.get_key(address, private=False, + fetch_remote=fetch_remote) + dpriv = defer.succeed(None) + if sign is not None: + dpriv = self.get_key(sign, private=True) + d = defer.gatherResults([dpub, dpriv], consumeErrors=True) + d.addCallbacks(encrypt, self._extract_first_error) + return d + + def decrypt(self, data, address, passphrase=None, verify=None, + fetch_remote=True): + """ + Decrypt data using private key from address and verify with public key + bound to verify address. + + :param data: The data to be decrypted. + :type data: str + :param address: The address to whom data was encrypted. + :type address: str + :param passphrase: The passphrase for the secret key used for + decryption. + :type passphrase: str + :param verify: The address to be used for signature. + :type verify: str + :param fetch_remote: If key for verify not found in local storage try + to fetch from nickserver + :type fetch_remote: bool + + :return: A Deferred which fires with: + * (decripted str, signing key) if validation works + * (decripted str, KeyNotFound) if signing key not found + * (decripted str, InvalidSignature) if signature is invalid + * KeyNotFound failure if private key not found + * DecryptError failure if decription failed + :rtype: Deferred + + :raise UnsupportedKeyTypeError: if invalid key type + """ + + @defer.inlineCallbacks + def decrypt(keys): + pubkey, privkey = keys + decrypted, signed = yield self._openpgp.decrypt( + data, privkey, passphrase=passphrase, verify=pubkey) + if pubkey is None: + signature = KeyNotFound(verify) + elif signed: + signature = pubkey + if not pubkey.sign_used: + pubkey.sign_used = True + yield self._openpgp.put_key(pubkey) + defer.returnValue((decrypted, signature)) + else: + signature = InvalidSignature( + 'Failed to verify signature with key %s' % + (pubkey.fingerprint,)) + defer.returnValue((decrypted, signature)) + + dpriv = self.get_key(address, private=True) + dpub = defer.succeed(None) + if verify is not None: + dpub = self.get_key(verify, private=False, + fetch_remote=fetch_remote) + dpub.addErrback(lambda f: None if f.check(KeyNotFound) else f) + d = defer.gatherResults([dpub, dpriv], consumeErrors=True) + d.addCallbacks(decrypt, self._extract_first_error) + return d + + def _extract_first_error(self, failure): + return failure.value.subFailure + + def sign(self, data, address, digest_algo='SHA512', clearsign=False, + detach=True, binary=False): + """ + Sign data with private key bound to address. + + :param data: The data to be signed. + :type data: str + :param address: The address to be used to sign. + :type address: EncryptionKey + :param digest_algo: The hash digest to use. + :type digest_algo: str + :param clearsign: If True, create a cleartext signature. + :type clearsign: bool + :param detach: If True, create a detached signature. + :type detach: bool + :param binary: If True, do not ascii armour the output. + :type binary: bool + + :return: A Deferred which fires with the signed data as str or fails + with KeyNotFound if no key was found neither locally or in + keyserver or fails with SignFailed if there was any error + signing. + :rtype: Deferred + + :raise UnsupportedKeyTypeError: if invalid key type + """ + + def sign(privkey): + return self._openpgp.sign( + data, privkey, digest_algo=digest_algo, clearsign=clearsign, + detach=detach, binary=binary) + + d = self.get_key(address, private=True) + d.addCallback(sign) + return d + + def verify(self, data, address, detached_sig=None, + fetch_remote=True): + """ + Verify signed data with private key bound to address, eventually using + detached_sig. + + :param data: The data to be verified. + :type data: str + :param address: The address to be used to verify. + :type address: EncryptionKey + :param detached_sig: A detached signature. If given, C{data} is + verified using this detached signature. + :type detached_sig: str + :param fetch_remote: If key for verify not found in local storage try + to fetch from nickserver + :type fetch_remote: bool + + :return: A Deferred which fires with the signing EncryptionKey if + signature verifies, or which fails with InvalidSignature if + signature don't verifies or fails with KeyNotFound if no key + was found neither locally or in keyserver. + :rtype: Deferred + + :raise UnsupportedKeyTypeError: if invalid key type + """ + + def verify(pubkey): + signed = self._openpgp.verify( + data, pubkey, detached_sig=detached_sig) + if signed: + if not pubkey.sign_used: + pubkey.sign_used = True + d = self._openpgp.put_key(pubkey) + d.addCallback(lambda _: pubkey) + return d + return pubkey + else: + raise InvalidSignature( + 'Failed to verify signature with key %s' % + (pubkey.fingerprint,)) + + d = self.get_key(address, private=False, + fetch_remote=fetch_remote) + d.addCallback(verify) + return d + + def delete_key(self, key): + """ + Remove key from storage. + + :param key: The key to be removed. + :type key: EncryptionKey + + :return: A Deferred which fires when the key is deleted, or which fails + KeyNotFound if the key was not found on local storage. + :rtype: Deferred + + :raise UnsupportedKeyTypeError: if invalid key type + """ + return self._openpgp.delete_key(key) + + def put_key(self, key): + """ + Put key bound to address in local storage. + + :param key: The key to be stored + :type key: EncryptionKey + + :return: A Deferred which fires when the key is in the storage, or + which fails with KeyNotValidUpdate if a key with the same + uid exists and the new one is not a valid update for it. + :rtype: Deferred + + :raise UnsupportedKeyTypeError: if invalid key type + """ + + def old_key_not_found(failure): + if failure.check(KeyNotFound): + return None + else: + return failure + + def check_upgrade(old_key): + if key.private or can_upgrade(key, old_key): + return self._openpgp.put_key(key) + else: + raise KeyNotValidUpgrade( + "Key %s can not be upgraded by new key %s" + % (old_key.fingerprint, key.fingerprint)) + + d = self._openpgp.get_key(key.address, private=key.private) + d.addErrback(old_key_not_found) + d.addCallback(check_upgrade) + return d + + def put_raw_key(self, key, address, + validation=ValidationLevels.Weak_Chain): + """ + Put raw key bound to address in local storage. + + :param key: The ascii key to be stored + :type key: str + :param address: address for which this key will be active + :type address: str + :param validation: validation level for this key + (default: 'Weak_Chain') + :type validation: ValidationLevels + + :return: A Deferred which fires when the key is in the storage, or + which fails with KeyAddressMismatch if address doesn't match + any uid on the key or fails with KeyNotFound if no OpenPGP + material was found in key or fails with KeyNotValidUpdate if a + key with the same uid exists and the new one is not a valid + update for it. + :rtype: Deferred + + :raise UnsupportedKeyTypeError: if invalid key type + """ + pubkey, privkey = self._openpgp.parse_key(key, address) + + if pubkey is None: + return defer.fail(KeyNotFound(key)) + + pubkey.validation = validation + d = self.put_key(pubkey) + if privkey is not None: + d.addCallback(lambda _: self.put_key(privkey)) + return d + + @defer.inlineCallbacks + def fetch_key(self, address, uri, validation=ValidationLevels.Weak_Chain): + """ + Fetch a public key bound to address from the network and put it in + local storage. + + :param address: The email address of the key. + :type address: str + :param uri: The URI of the key. + :type uri: str + :param validation: validation level for this key + (default: 'Weak_Chain') + :type validation: ValidationLevels + + :return: A Deferred which fires when the key is in the storage, or + which fails with KeyNotFound: if not valid key on uri or fails + with KeyAddressMismatch if address doesn't match any uid on + the key or fails with KeyNotValidUpdate if a key with the same + uid exists and the new one is not a valid update for it. + :rtype: Deferred + + :raise UnsupportedKeyTypeError: if invalid key type + """ + + logger.info("Fetch key for %s from %s" % (address, uri)) + ascii_content = yield self._get_with_combined_ca_bundle(uri) + + # XXX parse binary keys + pubkey, _ = self._openpgp.parse_key(ascii_content, address) + if pubkey is None: + raise KeyNotFound(uri) + + pubkey.validation = validation + yield self.put_key(pubkey) + + +def _split_email(address): + """ + Split username and domain from an email address + + :param address: an email address + :type address: str + + :return: username and domain from the email address + :rtype: (str, str) + """ + if address.count("@") != 1: + return None + return address.split("@") + + +def _get_domain(url): + """ + Get the domain from an url + + :param url: an url + :type url: str + + :return: the domain part of the url + :rtype: str + """ + return urlparse(url).hostname diff --git a/src/leap/bitmask/keymanager/_version.py b/src/leap/bitmask/keymanager/_version.py new file mode 100644 index 0000000..b28c697 --- /dev/null +++ b/src/leap/bitmask/keymanager/_version.py @@ -0,0 +1,484 @@ + +# This file helps to compute a version number in source trees obtained from +# git-archive tarball (such as those provided by githubs download-from-tag +# feature). Distribution tarballs (built by setup.py sdist) and build +# directories (produced by setup.py build) will contain a much shorter file +# that just contains the computed version number. + +# This file is released into the public domain. Generated by +# versioneer-0.16 (https://github.com/warner/python-versioneer) + +"""Git implementation of _version.py.""" + +import errno +import os +import re +import subprocess +import sys + + +def get_keywords(): + """Get the keywords needed to look up the version information.""" + # these strings will be replaced by git during git-archive. + # setup.py/versioneer.py will grep for the variable names, so they must + # each be defined on a line of their own. _version.py will just call + # get_keywords(). + git_refnames = "$Format:%d$" + git_full = "$Format:%H$" + keywords = {"refnames": git_refnames, "full": git_full} + return keywords + + +class VersioneerConfig: + """Container for Versioneer configuration parameters.""" + + +def get_config(): + """Create, populate and return the VersioneerConfig() object.""" + # these strings are filled in when 'setup.py versioneer' creates + # _version.py + cfg = VersioneerConfig() + cfg.VCS = "git" + cfg.style = "pep440" + cfg.tag_prefix = "" + cfg.parentdir_prefix = "None" + cfg.versionfile_source = "src/leap/keymanager/_version.py" + cfg.verbose = False + return cfg + + +class NotThisMethod(Exception): + """Exception raised if a method is not valid for the current scenario.""" + + +LONG_VERSION_PY = {} +HANDLERS = {} + + +def register_vcs_handler(vcs, method): # decorator + """Decorator to mark a method as the handler for a particular VCS.""" + def decorate(f): + """Store f in HANDLERS[vcs][method].""" + if vcs not in HANDLERS: + HANDLERS[vcs] = {} + HANDLERS[vcs][method] = f + return f + return decorate + + +def run_command(commands, args, cwd=None, verbose=False, hide_stderr=False): + """Call the given command(s).""" + assert isinstance(commands, list) + p = None + for c in commands: + try: + dispcmd = str([c] + args) + # remember shell=False, so use git.cmd on windows, not just git + p = subprocess.Popen([c] + args, cwd=cwd, stdout=subprocess.PIPE, + stderr=(subprocess.PIPE if hide_stderr + else None)) + break + except EnvironmentError: + e = sys.exc_info()[1] + if e.errno == errno.ENOENT: + continue + if verbose: + print("unable to run %s" % dispcmd) + print(e) + return None + else: + if verbose: + print("unable to find command, tried %s" % (commands,)) + return None + stdout = p.communicate()[0].strip() + if sys.version_info[0] >= 3: + stdout = stdout.decode() + if p.returncode != 0: + if verbose: + print("unable to run %s (error)" % dispcmd) + return None + return stdout + + +def versions_from_parentdir(parentdir_prefix, root, verbose): + """Try to determine the version from the parent directory name. + + Source tarballs conventionally unpack into a directory that includes + both the project name and a version string. + """ + dirname = os.path.basename(root) + if not dirname.startswith(parentdir_prefix): + if verbose: + print("guessing rootdir is '%s', but '%s' doesn't start with " + "prefix '%s'" % (root, dirname, parentdir_prefix)) + raise NotThisMethod("rootdir doesn't start with parentdir_prefix") + return {"version": dirname[len(parentdir_prefix):], + "full-revisionid": None, + "dirty": False, "error": None} + + +@register_vcs_handler("git", "get_keywords") +def git_get_keywords(versionfile_abs): + """Extract version information from the given file.""" + # the code embedded in _version.py can just fetch the value of these + # keywords. When used from setup.py, we don't want to import _version.py, + # so we do it with a regexp instead. This function is not used from + # _version.py. + keywords = {} + try: + f = open(versionfile_abs, "r") + for line in f.readlines(): + if line.strip().startswith("git_refnames ="): + mo = re.search(r'=\s*"(.*)"', line) + if mo: + keywords["refnames"] = mo.group(1) + if line.strip().startswith("git_full ="): + mo = re.search(r'=\s*"(.*)"', line) + if mo: + keywords["full"] = mo.group(1) + f.close() + except EnvironmentError: + pass + return keywords + + +@register_vcs_handler("git", "keywords") +def git_versions_from_keywords(keywords, tag_prefix, verbose): + """Get version information from git keywords.""" + if not keywords: + raise NotThisMethod("no keywords at all, weird") + refnames = keywords["refnames"].strip() + if refnames.startswith("$Format"): + if verbose: + print("keywords are unexpanded, not using") + raise NotThisMethod("unexpanded keywords, not a git-archive tarball") + refs = set([r.strip() for r in refnames.strip("()").split(",")]) + # starting in git-1.8.3, tags are listed as "tag: foo-1.0" instead of + # just "foo-1.0". If we see a "tag: " prefix, prefer those. + TAG = "tag: " + tags = set([r[len(TAG):] for r in refs if r.startswith(TAG)]) + if not tags: + # Either we're using git < 1.8.3, or there really are no tags. We use + # a heuristic: assume all version tags have a digit. The old git %d + # expansion behaves like git log --decorate=short and strips out the + # refs/heads/ and refs/tags/ prefixes that would let us distinguish + # between branches and tags. By ignoring refnames without digits, we + # filter out many common branch names like "release" and + # "stabilization", as well as "HEAD" and "master". + tags = set([r for r in refs if re.search(r'\d', r)]) + if verbose: + print("discarding '%s', no digits" % ",".join(refs-tags)) + if verbose: + print("likely tags: %s" % ",".join(sorted(tags))) + for ref in sorted(tags): + # sorting will prefer e.g. "2.0" over "2.0rc1" + if ref.startswith(tag_prefix): + r = ref[len(tag_prefix):] + if verbose: + print("picking %s" % r) + return {"version": r, + "full-revisionid": keywords["full"].strip(), + "dirty": False, "error": None + } + # no suitable tags, so version is "0+unknown", but full hex is still there + if verbose: + print("no suitable tags, using unknown + full revision id") + return {"version": "0+unknown", + "full-revisionid": keywords["full"].strip(), + "dirty": False, "error": "no suitable tags"} + + +@register_vcs_handler("git", "pieces_from_vcs") +def git_pieces_from_vcs(tag_prefix, root, verbose, run_command=run_command): + """Get version from 'git describe' in the root of the source tree. + + This only gets called if the git-archive 'subst' keywords were *not* + expanded, and _version.py hasn't already been rewritten with a short + version string, meaning we're inside a checked out source tree. + """ + if not os.path.exists(os.path.join(root, ".git")): + if verbose: + print("no .git in %s" % root) + raise NotThisMethod("no .git directory") + + GITS = ["git"] + if sys.platform == "win32": + GITS = ["git.cmd", "git.exe"] + # if there is a tag matching tag_prefix, this yields TAG-NUM-gHEX[-dirty] + # if there isn't one, this yields HEX[-dirty] (no NUM) + describe_out = run_command(GITS, ["describe", "--tags", "--dirty", + "--always", "--long", + "--match", "%s*" % tag_prefix], + cwd=root) + # --long was added in git-1.5.5 + if describe_out is None: + raise NotThisMethod("'git describe' failed") + describe_out = describe_out.strip() + full_out = run_command(GITS, ["rev-parse", "HEAD"], cwd=root) + if full_out is None: + raise NotThisMethod("'git rev-parse' failed") + full_out = full_out.strip() + + pieces = {} + pieces["long"] = full_out + pieces["short"] = full_out[:7] # maybe improved later + pieces["error"] = None + + # parse describe_out. It will be like TAG-NUM-gHEX[-dirty] or HEX[-dirty] + # TAG might have hyphens. + git_describe = describe_out + + # look for -dirty suffix + dirty = git_describe.endswith("-dirty") + pieces["dirty"] = dirty + if dirty: + git_describe = git_describe[:git_describe.rindex("-dirty")] + + # now we have TAG-NUM-gHEX or HEX + + if "-" in git_describe: + # TAG-NUM-gHEX + mo = re.search(r'^(.+)-(\d+)-g([0-9a-f]+)$', git_describe) + if not mo: + # unparseable. Maybe git-describe is misbehaving? + pieces["error"] = ("unable to parse git-describe output: '%s'" + % describe_out) + return pieces + + # tag + full_tag = mo.group(1) + if not full_tag.startswith(tag_prefix): + if verbose: + fmt = "tag '%s' doesn't start with prefix '%s'" + print(fmt % (full_tag, tag_prefix)) + pieces["error"] = ("tag '%s' doesn't start with prefix '%s'" + % (full_tag, tag_prefix)) + return pieces + pieces["closest-tag"] = full_tag[len(tag_prefix):] + + # distance: number of commits since tag + pieces["distance"] = int(mo.group(2)) + + # commit: short hex revision ID + pieces["short"] = mo.group(3) + + else: + # HEX: no tags + pieces["closest-tag"] = None + count_out = run_command(GITS, ["rev-list", "HEAD", "--count"], + cwd=root) + pieces["distance"] = int(count_out) # total number of commits + + return pieces + + +def plus_or_dot(pieces): + """Return a + if we don't already have one, else return a .""" + if "+" in pieces.get("closest-tag", ""): + return "." + return "+" + + +def render_pep440(pieces): + """Build up version string, with post-release "local version identifier". + + Our goal: TAG[+DISTANCE.gHEX[.dirty]] . Note that if you + get a tagged build and then dirty it, you'll get TAG+0.gHEX.dirty + + Exceptions: + 1: no tags. git_describe was just HEX. 0+untagged.DISTANCE.gHEX[.dirty] + """ + if pieces["closest-tag"]: + rendered = pieces["closest-tag"] + if pieces["distance"] or pieces["dirty"]: + rendered += plus_or_dot(pieces) + rendered += "%d.g%s" % (pieces["distance"], pieces["short"]) + if pieces["dirty"]: + rendered += ".dirty" + else: + # exception #1 + rendered = "0+untagged.%d.g%s" % (pieces["distance"], + pieces["short"]) + if pieces["dirty"]: + rendered += ".dirty" + return rendered + + +def render_pep440_pre(pieces): + """TAG[.post.devDISTANCE] -- No -dirty. + + Exceptions: + 1: no tags. 0.post.devDISTANCE + """ + if pieces["closest-tag"]: + rendered = pieces["closest-tag"] + if pieces["distance"]: + rendered += ".post.dev%d" % pieces["distance"] + else: + # exception #1 + rendered = "0.post.dev%d" % pieces["distance"] + return rendered + + +def render_pep440_post(pieces): + """TAG[.postDISTANCE[.dev0]+gHEX] . + + The ".dev0" means dirty. Note that .dev0 sorts backwards + (a dirty tree will appear "older" than the corresponding clean one), + but you shouldn't be releasing software with -dirty anyways. + + Exceptions: + 1: no tags. 0.postDISTANCE[.dev0] + """ + if pieces["closest-tag"]: + rendered = pieces["closest-tag"] + if pieces["distance"] or pieces["dirty"]: + rendered += ".post%d" % pieces["distance"] + if pieces["dirty"]: + rendered += ".dev0" + rendered += plus_or_dot(pieces) + rendered += "g%s" % pieces["short"] + else: + # exception #1 + rendered = "0.post%d" % pieces["distance"] + if pieces["dirty"]: + rendered += ".dev0" + rendered += "+g%s" % pieces["short"] + return rendered + + +def render_pep440_old(pieces): + """TAG[.postDISTANCE[.dev0]] . + + The ".dev0" means dirty. + + Eexceptions: + 1: no tags. 0.postDISTANCE[.dev0] + """ + if pieces["closest-tag"]: + rendered = pieces["closest-tag"] + if pieces["distance"] or pieces["dirty"]: + rendered += ".post%d" % pieces["distance"] + if pieces["dirty"]: + rendered += ".dev0" + else: + # exception #1 + rendered = "0.post%d" % pieces["distance"] + if pieces["dirty"]: + rendered += ".dev0" + return rendered + + +def render_git_describe(pieces): + """TAG[-DISTANCE-gHEX][-dirty]. + + Like 'git describe --tags --dirty --always'. + + Exceptions: + 1: no tags. HEX[-dirty] (note: no 'g' prefix) + """ + if pieces["closest-tag"]: + rendered = pieces["closest-tag"] + if pieces["distance"]: + rendered += "-%d-g%s" % (pieces["distance"], pieces["short"]) + else: + # exception #1 + rendered = pieces["short"] + if pieces["dirty"]: + rendered += "-dirty" + return rendered + + +def render_git_describe_long(pieces): + """TAG-DISTANCE-gHEX[-dirty]. + + Like 'git describe --tags --dirty --always -long'. + The distance/hash is unconditional. + + Exceptions: + 1: no tags. HEX[-dirty] (note: no 'g' prefix) + """ + if pieces["closest-tag"]: + rendered = pieces["closest-tag"] + rendered += "-%d-g%s" % (pieces["distance"], pieces["short"]) + else: + # exception #1 + rendered = pieces["short"] + if pieces["dirty"]: + rendered += "-dirty" + return rendered + + +def render(pieces, style): + """Render the given version pieces into the requested style.""" + if pieces["error"]: + return {"version": "unknown", + "full-revisionid": pieces.get("long"), + "dirty": None, + "error": pieces["error"]} + + if not style or style == "default": + style = "pep440" # the default + + if style == "pep440": + rendered = render_pep440(pieces) + elif style == "pep440-pre": + rendered = render_pep440_pre(pieces) + elif style == "pep440-post": + rendered = render_pep440_post(pieces) + elif style == "pep440-old": + rendered = render_pep440_old(pieces) + elif style == "git-describe": + rendered = render_git_describe(pieces) + elif style == "git-describe-long": + rendered = render_git_describe_long(pieces) + else: + raise ValueError("unknown style '%s'" % style) + + return {"version": rendered, "full-revisionid": pieces["long"], + "dirty": pieces["dirty"], "error": None} + + +def get_versions(): + """Get version information or return default if unable to do so.""" + # I am in _version.py, which lives at ROOT/VERSIONFILE_SOURCE. If we have + # __file__, we can work backwards from there to the root. Some + # py2exe/bbfreeze/non-CPython implementations don't do __file__, in which + # case we can only use expanded keywords. + + cfg = get_config() + verbose = cfg.verbose + + try: + return git_versions_from_keywords(get_keywords(), cfg.tag_prefix, + verbose) + except NotThisMethod: + pass + + try: + root = os.path.realpath(__file__) + # versionfile_source is the relative path from the top of the source + # tree (where the .git directory might live) to this file. Invert + # this to find the root from __file__. + for i in cfg.versionfile_source.split('/'): + root = os.path.dirname(root) + except NameError: + return {"version": "0+unknown", "full-revisionid": None, + "dirty": None, + "error": "unable to find root of source tree"} + + try: + pieces = git_pieces_from_vcs(cfg.tag_prefix, root, verbose) + return render(pieces, cfg.style) + except NotThisMethod: + pass + + try: + if cfg.parentdir_prefix: + return versions_from_parentdir(cfg.parentdir_prefix, root, verbose) + except NotThisMethod: + pass + + return {"version": "0+unknown", "full-revisionid": None, + "dirty": None, + "error": "unable to compute version"} diff --git a/src/leap/bitmask/keymanager/documents.py b/src/leap/bitmask/keymanager/documents.py new file mode 100644 index 0000000..2ed5376 --- /dev/null +++ b/src/leap/bitmask/keymanager/documents.py @@ -0,0 +1,101 @@ +# -*- coding: utf-8 -*- +# documents.py +# Copyright (C) 2013-2016 LEAP +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU 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 General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. +""" +Soledad documents +""" +from twisted.internet import defer +from leap.common.check import leap_assert + +# +# Dictionary keys used for storing cryptographic keys. +# + +KEY_VERSION_KEY = 'version' +KEY_UIDS_KEY = 'uids' +KEY_ADDRESS_KEY = 'address' +KEY_TYPE_KEY = 'type' +KEY_FINGERPRINT_KEY = 'fingerprint' +KEY_DATA_KEY = 'key_data' +KEY_PRIVATE_KEY = 'private' +KEY_LENGTH_KEY = 'length' +KEY_EXPIRY_DATE_KEY = 'expiry_date' +KEY_LAST_AUDITED_AT_KEY = 'last_audited_at' +KEY_REFRESHED_AT_KEY = 'refreshed_at' +KEY_VALIDATION_KEY = 'validation' +KEY_ENCR_USED_KEY = 'encr_used' +KEY_SIGN_USED_KEY = 'sign_used' +KEY_TAGS_KEY = 'tags' + + +# +# Key storage constants +# + +KEYMANAGER_KEY_TAG = 'keymanager-key' +KEYMANAGER_ACTIVE_TAG = 'keymanager-active' +KEYMANAGER_ACTIVE_TYPE = '-active' + +# Version of the Soledad Document schema, +# it should be bumped each time the document format changes +KEYMANAGER_DOC_VERSION = 1 + + +# +# key indexing constants. +# + +TAGS_PRIVATE_INDEX = 'by-tags-private' +TYPE_FINGERPRINT_PRIVATE_INDEX = 'by-type-fingerprint-private' +TYPE_ADDRESS_PRIVATE_INDEX = 'by-type-address-private' +INDEXES = { + TAGS_PRIVATE_INDEX: [ + KEY_TAGS_KEY, + 'bool(%s)' % KEY_PRIVATE_KEY, + ], + TYPE_FINGERPRINT_PRIVATE_INDEX: [ + KEY_TYPE_KEY, + KEY_FINGERPRINT_KEY, + 'bool(%s)' % KEY_PRIVATE_KEY, + ], + TYPE_ADDRESS_PRIVATE_INDEX: [ + KEY_TYPE_KEY, + KEY_ADDRESS_KEY, + 'bool(%s)' % KEY_PRIVATE_KEY, + ] +} + + +@defer.inlineCallbacks +def init_indexes(soledad): + """ + Initialize the database indexes. + """ + leap_assert(soledad is not None, + "Cannot init indexes with null soledad") + + indexes = yield soledad.list_indexes() + db_indexes = dict(indexes) + # Loop through the indexes we expect to find. + for name, expression in INDEXES.items(): + if name not in db_indexes: + # The index does not yet exist. + yield soledad.create_index(name, *expression) + elif expression != db_indexes[name]: + # The index exists but the definition is not what expected, + # so we delete it and add the proper index expression. + yield soledad.delete_index(name) + yield soledad.create_index(name, *expression) diff --git a/src/leap/bitmask/keymanager/errors.py b/src/leap/bitmask/keymanager/errors.py new file mode 100644 index 0000000..dfff393 --- /dev/null +++ b/src/leap/bitmask/keymanager/errors.py @@ -0,0 +1,119 @@ +# -*- coding: utf-8 -*- +# errors.py +# Copyright (C) 2013 LEAP +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU 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 General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. + + +""" +Errors and exceptions used by the Key Manager. +""" + + +class KeyNotFound(Exception): + """ + Raised when key was no found on keyserver. + """ + pass + + +class KeyVersionError(KeyNotFound): + """ + Raised when key was found in the keyring but the version is not supported. + + It will usually mean that it was created by a newer version of KeyManager. + """ + pass + + +class KeyAlreadyExists(Exception): + """ + Raised when attempted to create a key that already exists. + """ + pass + + +class KeyAttributesDiffer(Exception): + """ + Raised when trying to delete a key but the stored key differs from the key + passed to the delete_key() method. + """ + pass + + +class NoPasswordGiven(Exception): + """ + Raised when trying to perform some action that needs a password without + providing one. + """ + pass + + +class InvalidSignature(Exception): + """ + Raised when signature could not be verified. + """ + pass + + +class EncryptError(Exception): + """ + Raised upon failures of encryption. + """ + pass + + +class DecryptError(Exception): + """ + Raised upon failures of decryption. + """ + pass + + +class GPGError(Exception): + """ + Raised upon failures of encryption/decryption. + """ + pass + + +class SignFailed(Exception): + """ + Raised when failed to sign. + """ + pass + + +class KeyAddressMismatch(Exception): + """ + A mismatch between addresses. + """ + + +class KeyFingerprintMismatch(Exception): + """ + A mismatch between fingerprints. + """ + + +class KeyNotValidUpgrade(Exception): + """ + Already existing key can not be upgraded with the new key + """ + + +class UnsupportedKeyTypeError(Exception): + """ + Invalid key type + """ diff --git a/src/leap/bitmask/keymanager/keys.py b/src/leap/bitmask/keymanager/keys.py new file mode 100644 index 0000000..91ecf3a --- /dev/null +++ b/src/leap/bitmask/keymanager/keys.py @@ -0,0 +1,290 @@ +# -*- coding: utf-8 -*- +# keys.py +# Copyright (C) 2013-2016 LEAP +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU 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 General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. +""" +Abstact key type and encryption scheme representations. +""" + + +import json +import logging +import re +import time + +from datetime import datetime + +from leap.keymanager import errors +from leap.keymanager.wrapper import TempGPGWrapper +from leap.keymanager.validation import ValidationLevels +from leap.keymanager import documents as doc + +logger = logging.getLogger(__name__) + + +# +# Key handling utilities +# + +def is_address(address): + """ + Return whether the given C{address} is in the form user@provider. + + :param address: The address to be tested. + :type address: str + :return: Whether C{address} is in the form user@provider. + :rtype: bool + """ + return bool(re.match('[\w.-]+@[\w.-]+', address)) + + +def build_key_from_dict(key, active=None): + """ + Build an OpenPGPKey key based on info in C{kdict}. + + :param key: Dictionary with key data. + :type key: dict + :param active: Dictionary with active data. + :type active: dict + :return: An instance of the key. + :rtype: C{kClass} + """ + address = None + validation = ValidationLevels.Weak_Chain + last_audited_at = None + encr_used = False + sign_used = False + + if active: + address = active[doc.KEY_ADDRESS_KEY] + try: + validation = ValidationLevels.get(active[doc.KEY_VALIDATION_KEY]) + except ValueError: + logger.error("Not valid validation level (%s) for key %s", + (active[doc.KEY_VALIDATION_KEY], + active[doc.KEY_FINGERPRINT_KEY])) + last_audited_at = _to_datetime(active[doc.KEY_LAST_AUDITED_AT_KEY]) + encr_used = active[doc.KEY_ENCR_USED_KEY] + sign_used = active[doc.KEY_SIGN_USED_KEY] + + expiry_date = _to_datetime(key[doc.KEY_EXPIRY_DATE_KEY]) + refreshed_at = _to_datetime(key[doc.KEY_REFRESHED_AT_KEY]) + + return OpenPGPKey( + address=address, + uids=key[doc.KEY_UIDS_KEY], + fingerprint=key[doc.KEY_FINGERPRINT_KEY], + key_data=key[doc.KEY_DATA_KEY], + private=key[doc.KEY_PRIVATE_KEY], + length=key[doc.KEY_LENGTH_KEY], + expiry_date=expiry_date, + last_audited_at=last_audited_at, + refreshed_at=refreshed_at, + validation=validation, + encr_used=encr_used, + sign_used=sign_used, + ) + + +def _to_datetime(unix_time): + if unix_time != 0: + return datetime.fromtimestamp(unix_time) + else: + return None + + +def _to_unix_time(date): + if date is not None: + return int(time.mktime(date.timetuple())) + else: + return 0 + + +class OpenPGPKey(object): + """ + Base class for OpenPGP keys. + """ + + __slots__ = ('address', 'uids', 'fingerprint', 'key_data', + 'private', 'length', 'expiry_date', 'validation', + 'last_audited_at', 'refreshed_at', + 'encr_used', 'sign_used', '_index', '_gpgbinary') + + def __init__(self, address=None, gpgbinary=None, uids=[], fingerprint="", + key_data="", private=False, length=0, expiry_date=None, + validation=ValidationLevels.Weak_Chain, last_audited_at=None, + refreshed_at=None, encr_used=False, sign_used=False): + self._gpgbinary = gpgbinary + self.address = address + if not uids and address: + self.uids = [address] + else: + self.uids = uids + self.fingerprint = fingerprint + self.key_data = key_data + self.private = private + self.length = length + self.expiry_date = expiry_date + + self.validation = validation + self.last_audited_at = last_audited_at + self.refreshed_at = refreshed_at + self.encr_used = encr_used + self.sign_used = sign_used + self._index = len(self.__slots__) + + @property + def signatures(self): + """ + Get the key signatures + + :return: the key IDs that have signed the key + :rtype: list(str) + """ + with TempGPGWrapper(keys=[self], gpgbinary=self._gpgbinary) as gpg: + res = gpg.list_sigs(self.fingerprint) + for uid, sigs in res.sigs.iteritems(): + if parse_address(uid) in self.uids: + return sigs + + return [] + + def merge(self, newkey): + if newkey.fingerprint != self.fingerprint: + logger.critical( + "Can't put a key whith the same key_id and different " + "fingerprint: %s, %s" + % (newkey.fingerprint, self.fingerprint)) + raise errors.KeyFingerprintMismatch(newkey.fingerprint) + + with TempGPGWrapper(gpgbinary=self._gpgbinary) as gpg: + gpg.import_keys(self.key_data) + gpg.import_keys(newkey.key_data) + gpgkey = gpg.list_keys(secret=newkey.private).pop() + + if gpgkey['expires']: + self.expiry_date = datetime.fromtimestamp( + int(gpgkey['expires'])) + else: + self.expiry_date = None + + self.uids = [] + for uid in gpgkey['uids']: + self.uids.append(parse_address(uid)) + + self.length = int(gpgkey['length']) + self.key_data = gpg.export_keys(gpgkey['fingerprint'], + secret=self.private) + + if newkey.validation > self.validation: + self.validation = newkey.validation + if newkey.last_audited_at > self.last_audited_at: + self.validation = newkey.last_audited_at + self.encr_used = newkey.encr_used or self.encr_used + self.sign_used = newkey.sign_used or self.sign_used + self.refreshed_at = datetime.now() + + def get_json(self): + """ + Return a JSON string describing this key. + + :return: The JSON string describing this key. + :rtype: str + """ + expiry_date = _to_unix_time(self.expiry_date) + refreshed_at = _to_unix_time(self.refreshed_at) + + return json.dumps({ + doc.KEY_UIDS_KEY: self.uids, + doc.KEY_TYPE_KEY: self.__class__.__name__, + doc.KEY_FINGERPRINT_KEY: self.fingerprint, + doc.KEY_DATA_KEY: self.key_data, + doc.KEY_PRIVATE_KEY: self.private, + doc.KEY_LENGTH_KEY: self.length, + doc.KEY_EXPIRY_DATE_KEY: expiry_date, + doc.KEY_REFRESHED_AT_KEY: refreshed_at, + doc.KEY_VERSION_KEY: doc.KEYMANAGER_DOC_VERSION, + doc.KEY_TAGS_KEY: [doc.KEYMANAGER_KEY_TAG], + }) + + def get_active_json(self): + """ + Return a JSON string describing this key. + + :return: The JSON string describing this key. + :rtype: str + """ + last_audited_at = _to_unix_time(self.last_audited_at) + + return json.dumps({ + doc.KEY_ADDRESS_KEY: self.address, + doc.KEY_TYPE_KEY: (self.__class__.__name__ + + doc.KEYMANAGER_ACTIVE_TYPE), + doc.KEY_FINGERPRINT_KEY: self.fingerprint, + doc.KEY_PRIVATE_KEY: self.private, + doc.KEY_VALIDATION_KEY: str(self.validation), + doc.KEY_LAST_AUDITED_AT_KEY: last_audited_at, + doc.KEY_ENCR_USED_KEY: self.encr_used, + doc.KEY_SIGN_USED_KEY: self.sign_used, + doc.KEY_VERSION_KEY: doc.KEYMANAGER_DOC_VERSION, + doc.KEY_TAGS_KEY: [doc.KEYMANAGER_ACTIVE_TAG], + }) + + def next(self): + if self._index == 0: + self._index = len(self.__slots__) + raise StopIteration + + self._index -= 1 + key = self.__slots__[self._index] + + if key.startswith('_'): + return self.next() + + value = getattr(self, key) + if key == "validation": + value = str(value) + elif key in ["expiry_date", "last_audited_at", "refreshed_at"]: + value = str(value) + return key, value + + def __iter__(self): + return self + + def __repr__(self): + """ + Representation of this class + """ + return u"<%s 0x%s (%s - %s)>" % ( + self.__class__.__name__, + self.fingerprint, + self.address, + "priv" if self.private else "publ") + + +def parse_address(address): + """ + Remove name, '<', '>' and the identity suffix after the '+' until the '@' + e.g.: test_user+something@provider.com becomes test_user@provider.com + since the key belongs to the identity without the '+' suffix. + + :type address: str + :rtype: str + """ + mail_regex = '(.*<)?([\w.-]+)(\+.*)?(@[\w.-]+)(>.*)?' + match = re.match(mail_regex, address) + if match is None: + return None + return ''.join(match.group(2, 4)) diff --git a/src/leap/bitmask/keymanager/migrator.py b/src/leap/bitmask/keymanager/migrator.py new file mode 100644 index 0000000..c73da2e --- /dev/null +++ b/src/leap/bitmask/keymanager/migrator.py @@ -0,0 +1,167 @@ +# -*- coding: utf-8 -*- +# migrator.py +# Copyright (C) 2015 LEAP +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU 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 General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. + +""" +Document migrator +""" +# XXX: versioning has being added 12/2015 when keymanager was not +# much in use in the wild. We can probably drop support for +# keys without version at some point. + + +from collections import namedtuple +from twisted.internet.defer import gatherResults, succeed + +from leap.keymanager import documents as doc +from leap.keymanager.validation import ValidationLevels + + +KEY_ID_KEY = 'key_id' + +KeyDocs = namedtuple("KeyDocs", ['key', 'active']) + + +class KeyDocumentsMigrator(object): + """ + Migrate old KeyManager Soledad Documents to the newest schema + """ + + def __init__(self, soledad): + self._soledad = soledad + + def migrate(self): + deferred_public = self._get_docs(private=False) + deferred_public.addCallback(self._migrate_docs) + + deferred_private = self._get_docs(private=True) + deferred_private.addCallback(self._migrate_docs) + + return gatherResults([deferred_public, deferred_private]) + + def _get_docs(self, private=False): + private_value = '1' if private else '0' + + deferred_keys = self._soledad.get_from_index( + doc.TAGS_PRIVATE_INDEX, + doc.KEYMANAGER_KEY_TAG, + private_value) + deferred_active = self._soledad.get_from_index( + doc.TAGS_PRIVATE_INDEX, + doc.KEYMANAGER_ACTIVE_TAG, + private_value) + return gatherResults([deferred_keys, deferred_active]) + + def _migrate_docs(self, (key_docs, active_docs)): + def update_keys(keys): + deferreds = [] + for key_id in keys: + key = keys[key_id].key + actives = keys[key_id].active + + d = self._migrate_actives(key, actives) + deferreds.append(d) + + d = self._migrate_key(key) + deferreds.append(d) + return gatherResults(deferreds) + + d = self._buildKeyDict(key_docs, active_docs) + d.addCallback(lambda keydict: self._filter_outdated(keydict)) + d.addCallback(update_keys) + + def _buildKeyDict(self, keys, actives): + keydict = { + fp2id(key.content[doc.KEY_FINGERPRINT_KEY]): KeyDocs(key, []) + for key in keys} + + deferreds = [] + for active in actives: + if KEY_ID_KEY in active.content: + key_id = active.content[KEY_ID_KEY] + if key_id not in keydict: + d = self._soledad.delete_doc(active) + deferreds.append(d) + continue + keydict[key_id].active.append(active) + + d = gatherResults(deferreds) + d.addCallback(lambda _: keydict) + return d + + def _filter_outdated(self, keydict): + outdated = {} + for key_id, docs in keydict.items(): + if ((docs.key and doc.KEY_VERSION_KEY not in docs.key.content) or + docs.active): + outdated[key_id] = docs + return outdated + + def _migrate_actives(self, key, actives): + if not key: + deferreds = [] + for active in actives: + d = self._soledad.delete_doc(active) + deferreds.append(d) + return gatherResults(deferreds) + + validation = str(ValidationLevels.Weak_Chain) + last_audited = 0 + encr_used = False + sign_used = False + fingerprint = key.content[doc.KEY_FINGERPRINT_KEY] + if len(actives) == 1 and doc.KEY_VERSION_KEY not in key.content: + # we can preserve the validation of the key if there is only one + # active address for the key + validation = key.content[doc.KEY_VALIDATION_KEY] + last_audited = key.content[doc.KEY_LAST_AUDITED_AT_KEY] + encr_used = key.content[doc.KEY_ENCR_USED_KEY] + sign_used = key.content[doc.KEY_SIGN_USED_KEY] + + deferreds = [] + for active in actives: + if doc.KEY_VERSION_KEY in active.content: + continue + + active.content[doc.KEY_VERSION_KEY] = doc.KEYMANAGER_DOC_VERSION + active.content[doc.KEY_FINGERPRINT_KEY] = fingerprint + active.content[doc.KEY_VALIDATION_KEY] = validation + active.content[doc.KEY_LAST_AUDITED_AT_KEY] = last_audited + active.content[doc.KEY_ENCR_USED_KEY] = encr_used + active.content[doc.KEY_SIGN_USED_KEY] = sign_used + del active.content[KEY_ID_KEY] + d = self._soledad.put_doc(active) + deferreds.append(d) + return gatherResults(deferreds) + + def _migrate_key(self, key): + if not key or doc.KEY_VERSION_KEY in key.content: + return succeed(None) + + key.content[doc.KEY_VERSION_KEY] = doc.KEYMANAGER_DOC_VERSION + key.content[doc.KEY_UIDS_KEY] = key.content[doc.KEY_ADDRESS_KEY] + del key.content[doc.KEY_ADDRESS_KEY] + del key.content[KEY_ID_KEY] + del key.content[doc.KEY_VALIDATION_KEY] + del key.content[doc.KEY_LAST_AUDITED_AT_KEY] + del key.content[doc.KEY_ENCR_USED_KEY] + del key.content[doc.KEY_SIGN_USED_KEY] + return self._soledad.put_doc(key) + + +def fp2id(fingerprint): + KEY_ID_LENGTH = 16 + return fingerprint[-KEY_ID_LENGTH:] diff --git a/src/leap/bitmask/keymanager/openpgp.py b/src/leap/bitmask/keymanager/openpgp.py new file mode 100644 index 0000000..31c13df --- /dev/null +++ b/src/leap/bitmask/keymanager/openpgp.py @@ -0,0 +1,881 @@ +# -*- coding: utf-8 -*- +# openpgp.py +# Copyright (C) 2013-2016 LEAP +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU 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 General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. +""" +Infrastructure for using OpenPGP keys in Key Manager. +""" +import logging +import os +import re +import tempfile +import traceback +import io + + +from datetime import datetime +from multiprocessing import cpu_count +from gnupg.gnupg import GPGUtilities +from twisted.internet import defer +from twisted.internet.threads import deferToThread + +from leap.common.check import leap_assert, leap_assert_type, leap_check +from leap.keymanager import errors +from leap.keymanager.wrapper import TempGPGWrapper +from leap.keymanager.keys import ( + OpenPGPKey, + is_address, + parse_address, + build_key_from_dict, +) +from leap.keymanager.documents import ( + init_indexes, + TAGS_PRIVATE_INDEX, + TYPE_FINGERPRINT_PRIVATE_INDEX, + TYPE_ADDRESS_PRIVATE_INDEX, + KEY_UIDS_KEY, + KEY_FINGERPRINT_KEY, + KEY_PRIVATE_KEY, + KEY_REFRESHED_AT_KEY, + KEY_SIGN_USED_KEY, + KEY_ENCR_USED_KEY, + KEY_ADDRESS_KEY, + KEY_TYPE_KEY, + KEY_VERSION_KEY, + KEYMANAGER_DOC_VERSION, + KEYMANAGER_ACTIVE_TYPE, + KEYMANAGER_KEY_TAG, + KEYMANAGER_ACTIVE_TAG, +) + + +logger = logging.getLogger(__name__) + + +# +# A temporary GPG keyring wrapped to provide OpenPGP functionality. +# + +# This function will be used to call blocking GPG functions outside +# of Twisted reactor and match the concurrent calls to the amount of CPU cores +cpu_core_semaphore = defer.DeferredSemaphore(cpu_count()) + + +def from_thread(func, *args, **kwargs): + call = lambda: deferToThread(func, *args, **kwargs) + return cpu_core_semaphore.run(call) + + +# +# The OpenPGP wrapper +# + +class OpenPGPScheme(object): + """ + A wrapper for OpenPGP keys management and use (encryption, decyption, + signing and verification). + """ + + # type used on the soledad documents + KEY_TYPE = OpenPGPKey.__name__ + ACTIVE_TYPE = KEY_TYPE + KEYMANAGER_ACTIVE_TYPE + + def __init__(self, soledad, gpgbinary=None): + """ + Initialize the OpenPGP wrapper. + + :param soledad: A Soledad instance for key storage. + :type soledad: leap.soledad.Soledad + :param gpgbinary: Name for GnuPG binary executable. + :type gpgbinary: C{str} + """ + self._soledad = soledad + self._gpgbinary = gpgbinary + self.deferred_init = init_indexes(soledad) + self.deferred_init.addCallback(self._migrate_documents_schema) + self._wait_indexes("get_key", "put_key", "get_all_keys") + + def _migrate_documents_schema(self, _): + from leap.keymanager.migrator import KeyDocumentsMigrator + migrator = KeyDocumentsMigrator(self._soledad) + return migrator.migrate() + + def _wait_indexes(self, *methods): + """ + Methods that need to wait for the indexes to be ready. + + Heavily based on + http://blogs.fluidinfo.com/terry/2009/05/11/a-mixin-class-allowing-python-__init__-methods-to-work-with-twisted-deferreds/ + + :param methods: methods that need to wait for the indexes to be ready + :type methods: tuple(str) + """ + self.waiting = [] + self.stored = {} + + def restore(_): + for method in self.stored: + setattr(self, method, self.stored[method]) + for d in self.waiting: + d.callback(None) + + def makeWrapper(method): + def wrapper(*args, **kw): + d = defer.Deferred() + d.addCallback(lambda _: self.stored[method](*args, **kw)) + self.waiting.append(d) + return d + return wrapper + + for method in methods: + self.stored[method] = getattr(self, method) + setattr(self, method, makeWrapper(method)) + + self.deferred_init.addCallback(restore) + + # + # Keys management + # + + def gen_key(self, address): + """ + Generate an OpenPGP keypair bound to C{address}. + + :param address: The address bound to the key. + :type address: str + + :return: A Deferred which fires with the key bound to address, or fails + with KeyAlreadyExists if key already exists in local database. + :rtype: Deferred + """ + # make sure the key does not already exist + leap_assert(is_address(address), 'Not an user address: %s' % address) + + @defer.inlineCallbacks + def _gen_key(_): + with TempGPGWrapper(gpgbinary=self._gpgbinary) as gpg: + # TODO: inspect result, or use decorator + params = gpg.gen_key_input( + key_type='RSA', + key_length=4096, + name_real=address, + name_email=address, + name_comment='') + logger.info("About to generate keys... " + "This might take SOME time.") + yield from_thread(gpg.gen_key, params) + logger.info("Keys for %s have been successfully " + "generated." % (address,)) + pubkeys = gpg.list_keys() + + # assert for new key characteristics + leap_assert( + len(pubkeys) is 1, # a unitary keyring! + 'Keyring has wrong number of keys: %d.' % len(pubkeys)) + key = gpg.list_keys(secret=True).pop() + leap_assert( + len(key['uids']) is 1, # with just one uid! + 'Wrong number of uids for key: %d.' % len(key['uids'])) + uid_match = False + for uid in key['uids']: + if re.match('.*<%s>$' % address, uid) is not None: + uid_match = True + break + leap_assert(uid_match, 'Key not correctly bound to address.') + + # insert both public and private keys in storage + deferreds = [] + for secret in [True, False]: + key = gpg.list_keys(secret=secret).pop() + openpgp_key = self._build_key_from_gpg( + key, + gpg.export_keys(key['fingerprint'], secret=secret), + address) + d = self.put_key(openpgp_key) + deferreds.append(d) + yield defer.gatherResults(deferreds) + + def key_already_exists(_): + raise errors.KeyAlreadyExists(address) + + d = self.get_key(address) + d.addCallbacks(key_already_exists, _gen_key) + d.addCallback(lambda _: self.get_key(address, private=True)) + return d + + def get_key(self, address, private=False): + """ + Get key bound to C{address} from local storage. + + :param address: The address bound to the key. + :type address: str + :param private: Look for a private key instead of a public one? + :type private: bool + + :return: A Deferred which fires with the OpenPGPKey bound to address, + or which fails with KeyNotFound if the key was not found on + local storage. + :rtype: Deferred + """ + address = parse_address(address) + + def build_key((keydoc, activedoc)): + if keydoc is None: + raise errors.KeyNotFound(address) + leap_assert( + address in keydoc.content[KEY_UIDS_KEY], + 'Wrong address in key %s. Expected %s, found %s.' + % (keydoc.content[KEY_FINGERPRINT_KEY], address, + keydoc.content[KEY_UIDS_KEY])) + key = build_key_from_dict(keydoc.content, activedoc.content) + key._gpgbinary = self._gpgbinary + return key + + d = self._get_key_doc(address, private) + d.addCallback(build_key) + return d + + @defer.inlineCallbacks + def get_all_keys(self, private=False): + """ + Return all keys stored in local database. + + :param private: Include private keys + :type private: bool + + :return: A Deferred which fires with a list of all keys in local db. + :rtype: Deferred + """ + HAS_ACTIVE = "has_active" + + active_docs = yield self._soledad.get_from_index( + TAGS_PRIVATE_INDEX, + KEYMANAGER_ACTIVE_TAG, + '1' if private else '0') + key_docs = yield self._soledad.get_from_index( + TAGS_PRIVATE_INDEX, + KEYMANAGER_KEY_TAG, + '1' if private else '0') + + keys = [] + fp = lambda doc: doc.content[KEY_FINGERPRINT_KEY] + for active in active_docs: + fp_keys = filter(lambda k: fp(k) == fp(active), key_docs) + + if len(fp_keys) == 0: + yield self._soledad.delete_doc(active) + continue + elif len(fp_keys) == 1: + key = fp_keys[0] + else: + key = yield self._repair_key_docs(fp_keys) + key.content[HAS_ACTIVE] = True + keys.append(build_key_from_dict(key.content, active.content)) + + unactive_keys = filter(lambda k: HAS_ACTIVE not in k.content, key_docs) + keys += map(lambda k: build_key_from_dict(k.content), unactive_keys) + defer.returnValue(keys) + + def parse_key(self, key_data, address=None): + """ + Parses a key (or key pair) data and returns + the OpenPGPKey keys. + + :param key_data: the key data to be parsed. + :type key_data: str or unicode + :param address: Active address for the key. + :type address: str + + :returns: the public key and private key (if applies) for that data. + :rtype: (public, private) -> tuple(OpenPGPKey, OpenPGPKey) + the tuple may have one or both components None + """ + leap_assert_type(key_data, (str, unicode)) + # TODO: add more checks for correct key data. + leap_assert(key_data is not None, 'Data does not represent a key.') + + priv_info, privkey = process_key( + key_data, self._gpgbinary, secret=True) + pub_info, pubkey = process_key( + key_data, self._gpgbinary, secret=False) + + if not pubkey: + return (None, None) + + openpgp_privkey = None + if privkey: + # build private key + openpgp_privkey = self._build_key_from_gpg(priv_info, privkey, + address) + leap_check(pub_info['fingerprint'] == priv_info['fingerprint'], + 'Fingerprints for public and private key differ.', + errors.KeyFingerprintMismatch) + # build public key + openpgp_pubkey = self._build_key_from_gpg(pub_info, pubkey, address) + + return (openpgp_pubkey, openpgp_privkey) + + def put_raw_key(self, key_data, address): + """ + Put key contained in C{key_data} in local storage. + + :param key_data: The key data to be stored. + :type key_data: str or unicode + :param address: address for which this key will be active + :type address: str + + :return: A Deferred which fires when the OpenPGPKey is in the storage. + :rtype: Deferred + """ + leap_assert_type(key_data, (str, unicode)) + + openpgp_privkey = None + try: + openpgp_pubkey, openpgp_privkey = self.parse_key( + key_data, address) + except (errors.KeyAddressMismatch, errors.KeyFingerprintMismatch) as e: + return defer.fail(e) + + def put_key(_, key): + return self.put_key(key) + + d = defer.succeed(None) + if openpgp_pubkey is not None: + d.addCallback(put_key, openpgp_pubkey) + if openpgp_privkey is not None: + d.addCallback(put_key, openpgp_privkey) + return d + + def put_key(self, key): + """ + Put C{key} in local storage. + + :param key: The key to be stored. + :type key: OpenPGPKey + + :return: A Deferred which fires when the key is in the storage. + :rtype: Deferred + """ + def merge_and_put((keydoc, activedoc)): + if not keydoc: + return put_new_key(activedoc) + + active_content = None + if activedoc: + active_content = activedoc.content + oldkey = build_key_from_dict(keydoc.content, active_content) + + key.merge(oldkey) + keydoc.set_json(key.get_json()) + d = self._soledad.put_doc(keydoc) + d.addCallback(put_active, activedoc) + return d + + def put_new_key(activedoc): + deferreds = [] + if activedoc: + d = self._soledad.delete_doc(activedoc) + deferreds.append(d) + for json in [key.get_json(), key.get_active_json()]: + d = self._soledad.create_doc_from_json(json) + deferreds.append(d) + return defer.gatherResults(deferreds) + + def put_active(_, activedoc): + active_json = key.get_active_json() + if activedoc: + activedoc.set_json(active_json) + d = self._soledad.put_doc(activedoc) + else: + d = self._soledad.create_doc_from_json(active_json) + return d + + def get_active_doc(keydoc): + d = self._get_active_doc_from_address(key.address, key.private) + d.addCallback(lambda activedoc: (keydoc, activedoc)) + return d + + d = self._get_key_doc_from_fingerprint(key.fingerprint, key.private) + d.addCallback(get_active_doc) + d.addCallback(merge_and_put) + return d + + def _get_key_doc(self, address, private=False): + """ + Get the document with a key (public, by default) bound to C{address}. + + If C{private} is True, looks for a private key instead of a public. + + :param address: The address bound to the key. + :type address: str + :param private: Whether to look for a private key. + :type private: bool + + :return: A Deferred which fires with a touple of two SoledadDocument + (keydoc, activedoc) or None if it does not exist. + :rtype: Deferred + """ + def get_key_from_active_doc(activedoc): + if not activedoc: + return (None, None) + fingerprint = activedoc.content[KEY_FINGERPRINT_KEY] + d = self._get_key_doc_from_fingerprint(fingerprint, private) + d.addCallback(delete_active_if_no_key, activedoc) + return d + + def delete_active_if_no_key(keydoc, activedoc): + if not keydoc: + d = self._soledad.delete_doc(activedoc) + d.addCallback(lambda _: (None, None)) + return d + return (keydoc, activedoc) + + d = self._get_active_doc_from_address(address, private) + d.addCallback(get_key_from_active_doc) + return d + + def _build_key_from_gpg(self, key, key_data, address=None): + """ + Build an OpenPGPKey for C{address} based on C{key} from + local gpg storage. + + GPG key data has to be queried independently in this + wrapper, so we receive it in C{key_data}. + + :param address: Active address for the key. + :type address: str + :param key: Key obtained from GPG storage. + :type key: dict + :param key_data: Key data obtained from GPG storage. + :type key_data: str + :return: An instance of the key. + :rtype: OpenPGPKey + """ + return build_gpg_key(key, key_data, address, self._gpgbinary) + + def delete_key(self, key): + """ + Remove C{key} from storage. + + :param key: The key to be removed. + :type key: EncryptionKey + + :return: A Deferred which fires when the key is deleted, or which + fails with KeyNotFound if the key was not found on local + storage. + :rtype: Deferred + """ + leap_assert_type(key, OpenPGPKey) + + def delete_docs(activedocs): + deferreds = [] + for doc in activedocs: + d = self._soledad.delete_doc(doc) + deferreds.append(d) + return defer.gatherResults(deferreds) + + def get_key_docs(_): + return self._soledad.get_from_index( + TYPE_FINGERPRINT_PRIVATE_INDEX, + self.KEY_TYPE, + key.fingerprint, + '1' if key.private else '0') + + def delete_key(docs): + if len(docs) == 0: + raise errors.KeyNotFound(key) + elif len(docs) > 1: + logger.warning("There is more than one key for fingerprint %s" + % key.fingerprint) + + has_deleted = False + deferreds = [] + for doc in docs: + if doc.content['fingerprint'] == key.fingerprint: + d = self._soledad.delete_doc(doc) + deferreds.append(d) + has_deleted = True + if not has_deleted: + raise errors.KeyNotFound(key) + return defer.gatherResults(deferreds) + + d = self._soledad.get_from_index( + TYPE_FINGERPRINT_PRIVATE_INDEX, + self.ACTIVE_TYPE, + key.fingerprint, + '1' if key.private else '0') + d.addCallback(delete_docs) + d.addCallback(get_key_docs) + d.addCallback(delete_key) + return d + + # + # Data encryption, decryption, signing and verifying + # + + @staticmethod + def _assert_gpg_result_ok(result): + """ + Check if GPG result is 'ok' and log stderr outputs. + + :param result: GPG results, which have a field calld 'ok' that states + whether the gpg operation was successful or not. + :type result: object + + :raise GPGError: Raised when the gpg operation was not successful. + """ + stderr = getattr(result, 'stderr', None) + if stderr: + logger.debug("%s" % (stderr,)) + if getattr(result, 'ok', None) is not True: + raise errors.GPGError( + 'Failed to encrypt/decrypt: %s' % stderr) + + @defer.inlineCallbacks + def encrypt(self, data, pubkey, passphrase=None, sign=None, + cipher_algo='AES256'): + """ + Encrypt C{data} using public @{pubkey} and sign with C{sign} key. + + :param data: The data to be encrypted. + :type data: str + :param pubkey: The key used to encrypt. + :type pubkey: OpenPGPKey + :param sign: The key used for signing. + :type sign: OpenPGPKey + :param cipher_algo: The cipher algorithm to use. + :type cipher_algo: str + + :return: A Deferred that will be fired with the encrypted data. + :rtype: defer.Deferred + + :raise EncryptError: Raised if failed encrypting for some reason. + """ + leap_assert_type(pubkey, OpenPGPKey) + leap_assert(pubkey.private is False, 'Key is not public.') + keys = [pubkey] + if sign is not None: + leap_assert_type(sign, OpenPGPKey) + leap_assert(sign.private is True) + keys.append(sign) + with TempGPGWrapper(keys, self._gpgbinary) as gpg: + result = yield from_thread( + gpg.encrypt, + data, pubkey.fingerprint, + default_key=sign.fingerprint if sign else None, + passphrase=passphrase, symmetric=False, + cipher_algo=cipher_algo) + # Here we cannot assert for correctness of sig because the sig is + # in the ciphertext. + # result.ok - (bool) indicates if the operation succeeded + # result.data - (bool) contains the result of the operation + try: + self._assert_gpg_result_ok(result) + defer.returnValue(result.data) + except errors.GPGError as e: + logger.warning('Failed to encrypt: %s.' % str(e)) + raise errors.EncryptError() + + @defer.inlineCallbacks + def decrypt(self, data, privkey, passphrase=None, verify=None): + """ + Decrypt C{data} using private @{privkey} and verify with C{verify} key. + + :param data: The data to be decrypted. + :type data: str + :param privkey: The key used to decrypt. + :type privkey: OpenPGPKey + :param passphrase: The passphrase for the secret key used for + decryption. + :type passphrase: str + :param verify: The key used to verify a signature. + :type verify: OpenPGPKey + + :return: Deferred that will fire with the decrypted data and + if signature verifies (unicode, bool) + :rtype: Deferred + + :raise DecryptError: Raised if failed decrypting for some reason. + """ + leap_assert(privkey.private is True, 'Key is not private.') + keys = [privkey] + if verify is not None: + leap_assert_type(verify, OpenPGPKey) + leap_assert(verify.private is False) + keys.append(verify) + with TempGPGWrapper(keys, self._gpgbinary) as gpg: + try: + result = yield from_thread(gpg.decrypt, + data, passphrase=passphrase, + always_trust=True) + self._assert_gpg_result_ok(result) + + # verify signature + sign_valid = False + if (verify is not None and + result.valid is True and + verify.fingerprint == result.pubkey_fingerprint): + sign_valid = True + + defer.returnValue((result.data, sign_valid)) + except errors.GPGError as e: + logger.warning('Failed to decrypt: %s.' % str(e)) + raise errors.DecryptError(str(e)) + + def is_encrypted(self, data): + """ + Return whether C{data} was asymmetrically encrypted using OpenPGP. + + :param data: The data we want to know about. + :type data: str + + :return: Whether C{data} was encrypted using this wrapper. + :rtype: bool + """ + with TempGPGWrapper(gpgbinary=self._gpgbinary) as gpg: + gpgutil = GPGUtilities(gpg) + return gpgutil.is_encrypted_asym(data) + + def sign(self, data, privkey, digest_algo='SHA512', clearsign=False, + detach=True, binary=False): + """ + Sign C{data} with C{privkey}. + + :param data: The data to be signed. + :type data: str + + :param privkey: The private key to be used to sign. + :type privkey: OpenPGPKey + :param digest_algo: The hash digest to use. + :type digest_algo: str + :param clearsign: If True, create a cleartext signature. + :type clearsign: bool + :param detach: If True, create a detached signature. + :type detach: bool + :param binary: If True, do not ascii armour the output. + :type binary: bool + + :return: The ascii-armored signed data. + :rtype: str + """ + leap_assert_type(privkey, OpenPGPKey) + leap_assert(privkey.private is True) + + # result.fingerprint - contains the fingerprint of the key used to + # sign. + with TempGPGWrapper(privkey, self._gpgbinary) as gpg: + result = gpg.sign(data, default_key=privkey.fingerprint, + digest_algo=digest_algo, clearsign=clearsign, + detach=detach, binary=binary) + rfprint = privkey.fingerprint + privkey = gpg.list_keys(secret=True).pop() + kfprint = privkey['fingerprint'] + if result.fingerprint is None: + raise errors.SignFailed( + 'Failed to sign with key %s: %s' % + (privkey['fingerprint'], result.stderr)) + leap_assert( + result.fingerprint == kfprint, + 'Signature and private key fingerprints mismatch: ' + '%s != %s' % (rfprint, kfprint)) + return result.data + + def verify(self, data, pubkey, detached_sig=None): + """ + Verify signed C{data} with C{pubkey}, eventually using + C{detached_sig}. + + :param data: The data to be verified. + :type data: str + :param pubkey: The public key to be used on verification. + :type pubkey: OpenPGPKey + :param detached_sig: A detached signature. If given, C{data} is + verified against this detached signature. + :type detached_sig: str + + :return: signature matches + :rtype: bool + """ + leap_assert_type(pubkey, OpenPGPKey) + leap_assert(pubkey.private is False) + with TempGPGWrapper(pubkey, self._gpgbinary) as gpg: + result = None + if detached_sig is None: + result = gpg.verify(data) + else: + # to verify using a detached sig we have to use + # gpg.verify_file(), which receives the data as a binary + # stream and the name of a file containing the signature. + sf, sfname = tempfile.mkstemp() + with os.fdopen(sf, 'w') as sfd: + sfd.write(detached_sig) + result = gpg.verify_file(io.BytesIO(data), sig_file=sfname) + os.unlink(sfname) + gpgpubkey = gpg.list_keys().pop() + valid = result.valid + rfprint = result.fingerprint + kfprint = gpgpubkey['fingerprint'] + return valid and rfprint == kfprint + + def _get_active_doc_from_address(self, address, private): + d = self._soledad.get_from_index( + TYPE_ADDRESS_PRIVATE_INDEX, + self.ACTIVE_TYPE, + address, + '1' if private else '0') + d.addCallback(self._repair_and_get_doc, self._repair_active_docs) + d.addCallback(self._check_version) + return d + + def _get_key_doc_from_fingerprint(self, fingerprint, private): + d = self._soledad.get_from_index( + TYPE_FINGERPRINT_PRIVATE_INDEX, + self.KEY_TYPE, + fingerprint, + '1' if private else '0') + d.addCallback(self._repair_and_get_doc, self._repair_key_docs) + d.addCallback(self._check_version) + return d + + def _repair_and_get_doc(self, doclist, repair_func): + if len(doclist) is 0: + return None + elif len(doclist) > 1: + return repair_func(doclist) + return doclist[0] + + def _check_version(self, doc): + if doc is not None: + version = doc.content[KEY_VERSION_KEY] + if version > KEYMANAGER_DOC_VERSION: + raise errors.KeyVersionError(str(version)) + return doc + + def _repair_key_docs(self, doclist): + """ + If there is more than one key for a key id try to self-repair it + + :return: a Deferred that will be fired with the valid key doc once all + the deletions are completed + :rtype: Deferred + """ + def log_key_doc(doc): + logger.error("\t%s: %s" % (doc.content[KEY_UIDS_KEY], + doc.content[KEY_FINGERPRINT_KEY])) + + def cmp_key(d1, d2): + return cmp(d1.content[KEY_REFRESHED_AT_KEY], + d2.content[KEY_REFRESHED_AT_KEY]) + + return self._repair_docs(doclist, cmp_key, log_key_doc) + + @defer.inlineCallbacks + def _repair_active_docs(self, doclist): + """ + If there is more than one active doc for an address try to self-repair + it + + :return: a Deferred that will be fired with the valid active doc once + all the deletions are completed + :rtype: Deferred + """ + keys = {} + for doc in doclist: + fp = doc.content[KEY_FINGERPRINT_KEY] + private = doc.content[KEY_PRIVATE_KEY] + try: + key = yield self._get_key_doc_from_fingerprint(fp, private) + keys[fp] = key + except Exception: + pass + + def log_active_doc(doc): + logger.error("\t%s: %s" % (doc.content[KEY_ADDRESS_KEY], + doc.content[KEY_FINGERPRINT_KEY])) + + def cmp_active(d1, d2): + # XXX: for private keys it will be nice to check which key is known + # by the nicknym server and keep this one. But this needs a + # refactor that might not be worth it. + used1 = (d1.content[KEY_SIGN_USED_KEY] + + d1.content[KEY_ENCR_USED_KEY]) + used2 = (d2.content[KEY_SIGN_USED_KEY] + + d2.content[KEY_ENCR_USED_KEY]) + res = cmp(used1, used2) + if res != 0: + return res + + key1 = keys[d1.content[KEY_FINGERPRINT_KEY]] + key2 = keys[d2.content[KEY_FINGERPRINT_KEY]] + return cmp(key1.content[KEY_REFRESHED_AT_KEY], + key2.content[KEY_REFRESHED_AT_KEY]) + + doc = yield self._repair_docs(doclist, cmp_active, log_active_doc) + defer.returnValue(doc) + + def _repair_docs(self, doclist, cmp_func, log_func): + logger.error("BUG ---------------------------------------------------") + logger.error("There is more than one doc of type %s:" + % (doclist[0].content[KEY_TYPE_KEY],)) + + doclist.sort(cmp=cmp_func, reverse=True) + log_func(doclist[0]) + deferreds = [] + for doc in doclist[1:]: + log_func(doc) + d = self._soledad.delete_doc(doc) + deferreds.append(d) + + logger.error("") + logger.error(traceback.extract_stack()) + logger.error("BUG (please report above info) ------------------------") + d = defer.gatherResults(deferreds, consumeErrors=True) + d.addCallback(lambda _: doclist[0]) + return d + + +def process_key(key_data, gpgbinary, secret=False): + with TempGPGWrapper(gpgbinary=gpgbinary) as gpg: + try: + gpg.import_keys(key_data) + info = gpg.list_keys(secret=secret).pop() + key = gpg.export_keys(info['fingerprint'], secret=secret) + except IndexError: + info = {} + key = None + return info, key + + +def build_gpg_key(key_info, key_data, address=None, gpgbinary=None): + expiry_date = None + if key_info['expires']: + expiry_date = datetime.fromtimestamp(int(key_info['expires'])) + uids = [] + for uid in key_info['uids']: + uids.append(parse_address(uid)) + if address and address not in uids: + raise errors.KeyAddressMismatch("UIDs %s found, but expected %s" + % (str(uids), address)) + + return OpenPGPKey( + address=address, + uids=uids, + gpgbinary=gpgbinary, + fingerprint=key_info['fingerprint'], + key_data=key_data, + private=True if key_info['type'] == 'sec' else False, + length=int(key_info['length']), + expiry_date=expiry_date, + refreshed_at=datetime.now()) diff --git a/src/leap/bitmask/keymanager/validation.py b/src/leap/bitmask/keymanager/validation.py new file mode 100644 index 0000000..16a897e --- /dev/null +++ b/src/leap/bitmask/keymanager/validation.py @@ -0,0 +1,129 @@ +# -*- coding: utf-8 -*- +# __init__.py +# Copyright (C) 2014 LEAP +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU 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 General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. + +""" +Validation levels implementation for key managment. + +See: + https://leap.se/en/docs/design/transitional-key-validation +""" + + +from datetime import datetime + + +class ValidationLevel(object): + """ + A validation level + + Meant to be used to compare levels or get its string representation. + """ + def __init__(self, name, value): + self.name = name + self.value = value + + def __cmp__(self, other): + return cmp(self.value, other.value) + + def __str__(self): + return self.name + + def __repr__(self): + return "<ValidationLevel: %s (%d)>" % (self.name, self.value) + + +class _ValidationLevels(object): + """ + Handler class to manage validation levels. It should have only one global + instance 'ValidationLevels'. + + The levels are attributes of the instance and can be used like: + ValidationLevels.Weak_Chain + ValidationLevels.get("Weak_Chain") + """ + _level_names = ("Weak_Chain", + "Provider_Trust", + "Provider_Endorsement", + "Third_Party_Endorsement", + "Third_Party_Consensus", + "Historically_Auditing", + "Known_Key", + "Fingerprint") + + def __init__(self): + for name in self._level_names: + setattr(self, name, + ValidationLevel(name, self._level_names.index(name))) + + def get(self, name): + """ + Get the ValidationLevel of a name + + :param name: name of the level + :type name: str + :rtype: ValidationLevel + """ + return getattr(self, name) + + def __iter__(self): + return iter(self._level_names) + + +ValidationLevels = _ValidationLevels() + + +def can_upgrade(new_key, old_key): + """ + :type new_key: EncryptionKey + :type old_key: EncryptionKey + :rtype: bool + """ + # First contact + if old_key is None: + return True + + # An update of the same key + if new_key.fingerprint == old_key.fingerprint: + return True + + # Manually verified fingerprint + if new_key.validation == ValidationLevels.Fingerprint: + return True + + # Expired key and higher validation level + if (old_key.expiry_date is not None and + old_key.expiry_date < datetime.now() and + new_key.validation >= old_key.validation): + return True + + # No expiration date and higher validation level + if (old_key.expiry_date is None and + new_key.validation > old_key.validation): + return True + + # Not successfully used and strict high validation level + if (not (old_key.sign_used and old_key.encr_used) and + new_key.validation > old_key.validation): + return True + + # New key signed by the old key + # XXX: signatures are using key-ids instead of fingerprints + key_id = old_key.fingerprint[-16:] + if key_id in new_key.signatures: + return True + + return False diff --git a/src/leap/bitmask/keymanager/wrapper.py b/src/leap/bitmask/keymanager/wrapper.py new file mode 100644 index 0000000..4f36cec --- /dev/null +++ b/src/leap/bitmask/keymanager/wrapper.py @@ -0,0 +1,134 @@ +# -*- coding: utf-8 -*- +# wrapper.py +# Copyright (C) 2016 LEAP +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU 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 General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. +""" +GPG wrapper for temporary keyrings +""" +import os +import shutil +import tempfile +from gnupg import GPG + +from leap.common.check import leap_assert + + +class TempGPGWrapper(object): + """ + A context manager that wraps a temporary GPG keyring which only contains + the keys given at object creation. + """ + + def __init__(self, keys=None, gpgbinary=None): + """ + Create an empty temporary keyring and import any given C{keys} into + it. + + :param keys: OpenPGP key, or list of. + :type keys: OpenPGPKey or list of OpenPGPKeys + :param gpgbinary: Name for GnuPG binary executable. + :type gpgbinary: C{str} + """ + self._gpg = None + self._gpgbinary = gpgbinary + if not keys: + keys = list() + if not isinstance(keys, list): + keys = [keys] + self._keys = keys + + def __enter__(self): + """ + Build and return a GPG keyring containing the keys given on + object creation. + + :return: A GPG instance containing the keys given on object creation. + :rtype: gnupg.GPG + """ + self._build_keyring() + return self._gpg + + def __exit__(self, exc_type, exc_value, traceback): + """ + Ensure the gpg is properly destroyed. + """ + # TODO handle exceptions and log here + self._destroy_keyring() + + def _build_keyring(self): + """ + Create a GPG keyring containing the keys given on object creation. + + :return: A GPG instance containing the keys given on object creation. + :rtype: gnupg.GPG + """ + privkeys = [key for key in self._keys if key and key.private is True] + publkeys = [key for key in self._keys if key and key.private is False] + # here we filter out public keys that have a correspondent + # private key in the list because the private key_data by + # itself is enough to also have the public key in the keyring, + # and we want to count the keys afterwards. + + privfps = map(lambda privkey: privkey.fingerprint, privkeys) + publkeys = filter( + lambda pubkey: pubkey.fingerprint not in privfps, publkeys) + + listkeys = lambda: self._gpg.list_keys() + listsecretkeys = lambda: self._gpg.list_keys(secret=True) + + self._gpg = GPG(binary=self._gpgbinary, + homedir=tempfile.mkdtemp()) + leap_assert(len(listkeys()) is 0, 'Keyring not empty.') + + # import keys into the keyring: + # concatenating ascii-armored keys, which is correctly + # understood by GPG. + + self._gpg.import_keys("".join( + [x.key_data for x in publkeys + privkeys])) + + # assert the number of keys in the keyring + leap_assert( + len(listkeys()) == len(publkeys) + len(privkeys), + 'Wrong number of public keys in keyring: %d, should be %d)' % + (len(listkeys()), len(publkeys) + len(privkeys))) + leap_assert( + len(listsecretkeys()) == len(privkeys), + 'Wrong number of private keys in keyring: %d, should be %d)' % + (len(listsecretkeys()), len(privkeys))) + + def _destroy_keyring(self): + """ + Securely erase the keyring. + """ + # TODO: implement some kind of wiping of data or a more + # secure way that + # does not write to disk. + + try: + for secret in [True, False]: + for key in self._gpg.list_keys(secret=secret): + self._gpg.delete_keys( + key['fingerprint'], + secret=secret) + leap_assert(len(self._gpg.list_keys()) is 0, 'Keyring not empty!') + + except: + raise + + finally: + leap_assert(self._gpg.homedir != os.path.expanduser('~/.gnupg'), + "watch out! Tried to remove default gnupg home!") + shutil.rmtree(self._gpg.homedir) |