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# -*- 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.keys import (
TAGS_PRIVATE_INDEX,
KEYMANAGER_KEY_TAG,
KEYMANAGER_ACTIVE_TAG,
KEYMANAGER_DOC_VERSION,
KEY_VERSION_KEY,
KEY_FINGERPRINT_KEY,
KEY_VALIDATION_KEY,
KEY_LAST_AUDITED_AT_KEY,
KEY_ENCR_USED_KEY,
KEY_SIGN_USED_KEY,
)
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(
TAGS_PRIVATE_INDEX,
KEYMANAGER_KEY_TAG,
private_value)
deferred_active = self._soledad.get_from_index(
TAGS_PRIVATE_INDEX,
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[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 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[KEY_FINGERPRINT_KEY]
if len(actives) == 1 and 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[KEY_VALIDATION_KEY]
last_audited = key.content[KEY_LAST_AUDITED_AT_KEY]
encr_used = key.content[KEY_ENCR_USED_KEY]
sign_used = key.content[KEY_SIGN_USED_KEY]
deferreds = []
for active in actives:
if KEY_VERSION_KEY in active.content:
continue
active.content[KEY_VERSION_KEY] = KEYMANAGER_DOC_VERSION
active.content[KEY_FINGERPRINT_KEY] = fingerprint
active.content[KEY_VALIDATION_KEY] = validation
active.content[KEY_LAST_AUDITED_AT_KEY] = last_audited
active.content[KEY_ENCR_USED_KEY] = encr_used
active.content[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 KEY_VERSION_KEY in key.content:
return succeed(None)
key.content[KEY_VERSION_KEY] = KEYMANAGER_DOC_VERSION
del key.content[KEY_ID_KEY]
del key.content[KEY_VALIDATION_KEY]
del key.content[KEY_LAST_AUDITED_AT_KEY]
del key.content[KEY_ENCR_USED_KEY]
del key.content[KEY_SIGN_USED_KEY]
return self._soledad.put_doc(key)
def fp2id(fingerprint):
KEY_ID_LENGTH = 16
return fingerprint[-KEY_ID_LENGTH:]
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