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-rw-r--r--src/leap/keymanager/keys.py285
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diff --git a/src/leap/keymanager/keys.py b/src/leap/keymanager/keys.py
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-# -*- coding: utf-8 -*-
-# keys.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/>.
-
-
-"""
-Abstact key type and encryption scheme representations.
-"""
-
-
-try:
- import simplejson as json
-except ImportError:
- import json # noqa
-import re
-
-
-from abc import ABCMeta, abstractmethod
-from leap.common.check import leap_assert
-
-
-#
-# Dictionary keys used for storing cryptographic keys.
-#
-
-KEY_ADDRESS_KEY = 'address'
-KEY_TYPE_KEY = 'type'
-KEY_ID_KEY = 'key_id'
-KEY_FINGERPRINT_KEY = 'fingerprint'
-KEY_DATA_KEY = 'key_data'
-KEY_PRIVATE_KEY = 'private'
-KEY_LENGTH_KEY = 'length'
-KEY_EXPIRY_DATE_KEY = 'expiry_date'
-KEY_FIRST_SEEN_AT_KEY = 'first_seen_at'
-KEY_LAST_AUDITED_AT_KEY = 'last_audited_at'
-KEY_VALIDATION_KEY = 'validation'
-KEY_TAGS_KEY = 'tags'
-
-
-#
-# Key storage constants
-#
-
-KEYMANAGER_KEY_TAG = 'keymanager-key'
-
-
-#
-# key indexing constants.
-#
-
-TAGS_PRIVATE_INDEX = 'by-tags-private'
-TAGS_ADDRESS_PRIVATE_INDEX = 'by-tags-address-private'
-INDEXES = {
- TAGS_PRIVATE_INDEX: [
- KEY_TAGS_KEY,
- 'bool(%s)' % KEY_PRIVATE_KEY,
- ],
- TAGS_ADDRESS_PRIVATE_INDEX: [
- KEY_TAGS_KEY,
- KEY_ADDRESS_KEY,
- 'bool(%s)' % KEY_PRIVATE_KEY,
- ]
-}
-
-
-#
-# 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(kClass, address, kdict):
- """
- Build an C{kClass} key bound to C{address} based on info in C{kdict}.
-
- :param address: The address bound to the key.
- :type address: str
- :param kdict: Dictionary with key data.
- :type kdict: dict
- :return: An instance of the key.
- :rtype: C{kClass}
- """
- leap_assert(
- address == kdict[KEY_ADDRESS_KEY],
- 'Wrong address in key data.')
- return kClass(
- address,
- key_id=kdict[KEY_ID_KEY],
- fingerprint=kdict[KEY_FINGERPRINT_KEY],
- key_data=kdict[KEY_DATA_KEY],
- private=kdict[KEY_PRIVATE_KEY],
- length=kdict[KEY_LENGTH_KEY],
- expiry_date=kdict[KEY_EXPIRY_DATE_KEY],
- first_seen_at=kdict[KEY_FIRST_SEEN_AT_KEY],
- last_audited_at=kdict[KEY_LAST_AUDITED_AT_KEY],
- validation=kdict[KEY_VALIDATION_KEY], # TODO: verify for validation.
- )
-
-
-#
-# Abstraction for encryption keys
-#
-
-class EncryptionKey(object):
- """
- Abstract class for encryption keys.
-
- A key is "validated" if the nicknym agent has bound the user address to a
- public key. Nicknym supports three different levels of key validation:
-
- * Level 3 - path trusted: A path of cryptographic signatures can be traced
- from a trusted key to the key under evaluation. By default, only the
- provider key from the user's provider is a "trusted key".
- * level 2 - provider signed: The key has been signed by a provider key for
- the same domain, but the provider key is not validated using a trust
- path (i.e. it is only registered)
- * level 1 - registered: The key has been encountered and saved, it has no
- signatures (that are meaningful to the nicknym agent).
- """
-
- __metaclass__ = ABCMeta
-
- def __init__(self, address, key_id=None, fingerprint=None,
- key_data=None, private=None, length=None, expiry_date=None,
- validation=None, first_seen_at=None, last_audited_at=None):
- self.address = address
- self.key_id = key_id
- self.fingerprint = fingerprint
- self.key_data = key_data
- self.private = private
- self.length = length
- self.expiry_date = expiry_date
- self.validation = validation
- self.first_seen_at = first_seen_at
- self.last_audited_at = last_audited_at
-
- def get_json(self):
- """
- Return a JSON string describing this key.
-
- :return: The JSON string describing this key.
- :rtype: str
- """
- return json.dumps({
- KEY_ADDRESS_KEY: self.address,
- KEY_TYPE_KEY: str(self.__class__),
- KEY_ID_KEY: self.key_id,
- KEY_FINGERPRINT_KEY: self.fingerprint,
- KEY_DATA_KEY: self.key_data,
- KEY_PRIVATE_KEY: self.private,
- KEY_LENGTH_KEY: self.length,
- KEY_EXPIRY_DATE_KEY: self.expiry_date,
- KEY_VALIDATION_KEY: self.validation,
- KEY_FIRST_SEEN_AT_KEY: self.first_seen_at,
- KEY_LAST_AUDITED_AT_KEY: self.last_audited_at,
- KEY_TAGS_KEY: [KEYMANAGER_KEY_TAG],
- })
-
- def __repr__(self):
- """
- Representation of this class
- """
- return u"<%s 0x%s (%s - %s)>" % (
- self.__class__.__name__,
- self.key_id,
- self.address,
- "priv" if self.private else "publ")
-
-
-#
-# Encryption schemes
-#
-
-class EncryptionScheme(object):
- """
- Abstract class for Encryption Schemes.
-
- A wrapper for a certain encryption schemes should know how to get and put
- keys in local storage using Soledad, how to generate new keys and how to
- find out about possibly encrypted content.
- """
-
- __metaclass__ = ABCMeta
-
- def __init__(self, soledad):
- """
- Initialize this Encryption Scheme.
-
- :param soledad: A Soledad instance for local storage of keys.
- :type soledad: leap.soledad.Soledad
- """
- self._soledad = soledad
- self._init_indexes()
-
- def _init_indexes(self):
- """
- Initialize the database indexes.
- """
- # Ask the database for currently existing indexes.
- db_indexes = dict(self._soledad.list_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.
- self._soledad.create_index(name, *expression)
- continue
- if expression == db_indexes[name]:
- # The index exists and is up to date.
- continue
- # The index exists but the definition is not what expected, so we
- # delete it and add the proper index expression.
- self._soledad.delete_index(name)
- self._soledad.create_index(name, *expression)
-
- @abstractmethod
- def get_key(self, address, private=False):
- """
- Get key 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: The key bound to C{address}.
- :rtype: EncryptionKey
- @raise KeyNotFound: If the key was not found on local storage.
- """
- pass
-
- @abstractmethod
- def put_key(self, key):
- """
- Put a key in local storage.
-
- :param key: The key to be stored.
- :type key: EncryptionKey
- """
- pass
-
- @abstractmethod
- def gen_key(self, address):
- """
- Generate a new key.
-
- :param address: The address bound to the key.
- :type address: str
-
- :return: The key bound to C{address}.
- :rtype: EncryptionKey
- """
- pass
-
- @abstractmethod
- def delete_key(self, key):
- """
- Remove C{key} from storage.
-
- :param key: The key to be removed.
- :type key: EncryptionKey
- """
- pass