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-rw-r--r--src/leap/common/keymanager/__init__.py232
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+# -*- 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.
+"""
+
+
+try:
+ import simplejson as json
+except ImportError:
+ import json # noqa
+
+
+from abc import ABCMeta, abstractmethod
+from u1db.errors import HTTPError
+
+
+#
+# Key types
+#
+
+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, 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.length = length
+ self.expiry_date = expiry_date
+ self.validation = validation
+ self.first_seen_at = first_seen_at
+ self.last_audited_at = last_audited_at
+
+ @abstractmethod
+ def get_json(self):
+ """
+ Return a JSON string describing this key.
+
+ @return: The JSON string describing this key.
+ @rtype: str
+ """
+
+
+#
+# Key wrappers
+#
+
+class KeyTypeWrapper(object):
+ """
+ Abstract class for Key Type Wrappers.
+
+ A wrapper for a certain key type should know how to get and put keys in
+ local storage using Soledad and also how to generate new keys.
+ """
+
+ __metaclass__ = ABCMeta
+
+ @abstractmethod
+ def get_key(self, address):
+ """
+ Get key from local storage.
+
+ @param address: The address bound to the key.
+ @type address: str
+
+ @return: The key bound to C{address}.
+ @rtype: EncryptionKey
+ @raise KeyNotFound: If the key was not found on local storage.
+ """
+
+ @abstractmethod
+ def put_key(self, key):
+ """
+ Put a key in local storage.
+
+ @param key: The key to be stored.
+ @type key: EncryptionKey
+ """
+
+ @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
+ """
+
+
+#
+# Key manager
+#
+
+
+class KeyNotFound(Exception):
+ """
+ Raised when key was no found on keyserver.
+ """
+
+
+class KeyManager(object):
+
+ def __init__(self, address, url):
+ """
+ Initialize a Key Manager for user's C{address} with provider's
+ nickserver reachable in C{url}.
+
+ @param address: The address of the user of this Key Manager.
+ @type address: str
+ @param url: The URL of the key manager.
+ @type url: str
+ """
+ self.address = address
+ self.url = url
+
+ def send_key(self, ktype, send_private=False, password=None):
+ """
+ Send user's key of type C{ktype} 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.
+
+ If C{send_private} is True, then the private key is encrypted with
+ C{password} and sent to server in the same request, together with a
+ hash string of user's address and password. The encrypted private key
+ will be saved in the server in a way it is publicly retrievable
+ through the hash string.
+
+ @param address: The address bound to the key.
+ @type address: str
+ @param ktype: The type of the key.
+ @type ktype: KeyType
+
+ @raise httplib.HTTPException:
+ """
+
+ def get_key(self, address, ktype):
+ """
+ Return a key of type C{ktype} bound to C{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 ktype: The type of the key.
+ @type ktype: KeyType
+
+ @return: A key of type C{ktype} bound to C{address}.
+ @rtype: EncryptionKey
+ @raise KeyNotFound: If the key was not found both locally and in
+ keyserver.
+ """
+ try:
+ return wrapper_map[ktype].get_key(address)
+ except KeyNotFound:
+ key = filter(lambda k: isinstance(k, ktype),
+ self._fetch_keys(address))
+ if key is None
+ raise KeyNotFound()
+ wrapper_map[ktype].put_key(key)
+ return key
+
+
+ def _fetch_keys(self, address):
+ """
+ Fetch keys bound to C{address} from nickserver.
+
+ @param address: The address bound to the keys.
+ @type address: str
+
+ @return: A list of keys bound to C{address}.
+ @rtype: list of EncryptionKey
+ @raise KeyNotFound: If the key was not found on nickserver.
+ @raise httplib.HTTPException:
+ """
+
+ def refresh_keys(self):
+ """
+ Update the user's db of validated keys to see if there are changes.
+ """
+
+ def gen_key(self, ktype):
+ """
+ Generate a key of type C{ktype} bound to the user's address.
+
+ @param ktype: The type of the key.
+ @type ktype: KeyType
+
+ @return: The generated key.
+ @rtype: EncryptionKey
+ """
+ return wrapper_map[ktype].gen_key(self.address)