Reorder

[securemail.git] / app / backend / user.py

diff --git a/app/backend/user.py b/app/backend/user.py
new file mode 100644 (file)
index 0000000..a4ab2f7
--- /dev/null
+++ b/app/backend/user.py
@@ -0,0 +1,142 @@
+# -*- coding: utf-8 -*-
+ 
+# Copyright (c) 2018  Michael Rasmussen <mir@datanom.net>
+ 
+# This file is part of SecureMail.
+
+# SecureMail 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.
+#
+# SecureMail 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 SecureMail.  If not, see <https://www.gnu.org/licenses/>.
+
+import pickle
+from db import DBInterface as DBI
+from cryptonize import Cryptonize
+from nacl.public import PublicKey
+
+class NoSuchUser(Exception):
+    pass
+
+class User:
+    """
+    Class implementing the backend users
+    """
+    def __init__(self, key=None):
+        if key is not None:
+            self.load(key)
+        else:
+            self.pubkeys = {}
+
+    def store(self, key):
+        crypto = Cryptonize()
+        cipher = crypto.symmetric_encrypt(key, pickle.dumps(self))
+        DBI.store_user(crypto.generate_hash(key), cipher)
+
+    def load(self, key):
+        crypto = Cryptonize()
+        cipher = DBI.load_user(crypto.generate_hash(key))
+        if cipher is None:
+            raise NoSuchUser('{0}: User not found'.format(key))
+        plain = crypto.symmetric_decrypt(key, cipher)
+        try:
+            obj = pickle.loads(plain)
+            self.__dict__.update(obj.__dict__)
+        except pickle.UnpicklingError as e:
+            raise e
+    
+    def add_pubkey(self, email, key):
+        if email not in self.pubkeys:
+            self.pubkeys[email] = key.encode()
+        else:
+            raise KeyError('{0}: Exists'.format(email))
+    
+    def update_pubkey(self, email, key):
+        self.pubkeys[email] = key.encode()
+
+    def delete_pubkey(self, email):
+        if email in self.pubkeys:
+            del self.pubkeys[email]
+
+    def get_pubkey(self, email):
+        if email in self.pubkeys:
+            key = self.pubkeys[email]
+            key = PublicKey(key)
+        else:
+            key = None
+        
+        return key
+
+    @property
+    def name(self):
+        return self._name
+
+    @name.setter
+    def name(self, name):
+        self._name = name
+
+    @property
+    def email(self):
+        return self._email
+
+    @email.setter
+    def email(self, email):
+        self._email = email
+
+    @property
+    def pubkeys(self):
+        return self._pubkeys
+
+    @pubkeys.setter
+    def pubkeys(self, pubkeys):
+        if type(pubkeys) is not type({}):
+            raise ValueError('Not dictionary')
+        self._pubkeys = pubkeys
+
+if __name__ == '__main__':
+    try:
+        u = User('test')
+        for attr, value in u.__dict__.items():
+            print ('{0}: {1}'.format(attr, value))
+        print ('{0} - {1} - {2}'.format(u.name, u.email, u.pubkeys))
+        key = ''
+        for i in range(40):
+            key += '{0}'.format(i)
+        u = User()
+        u.name = 'testname1'
+        u.email = 'testname1@securemail.icu'
+        u.pubkeys = {'test': 'some test', 'test1': 'some test 1'}
+        try:
+            u.store(key)
+        except:
+            u = User(key)
+            for attr, value in u.__dict__.items():
+                print ('{0}: {1}'.format(attr, value))
+            print ('{0} - {1} - {2}'.format(u.name, u.email, u.pubkeys))
+        c = Cryptonize()
+        keypair1 = c.get_key_pair()
+        keypair2 = c.get_key_pair()
+        try:
+            u.add_pubkey('test', keypair2[1])
+        except KeyError:
+            u.update_pubkey('test', keypair2[1])
+        message = "Kill all humans æøåÅØÆ"
+        print ("Message to encrypt: {0}".format(message))
+        encrypted = c.asymmetric_encrypt(keypair1[0], u.get_pubkey('test'), message)
+        print ("Message encrypted: {0}".format(encrypted))
+        plaintext = c.asymmetric_decrypt(keypair2[0], keypair1[1], encrypted)
+        print("Message decrypted: {0}".format(plaintext.decode()))
+    except NoSuchUser:
+        u = User()
+        u.name = 'testname'
+        u.email = 'testname@securemail.icu'
+        u.store('test')
+    except Exception as e:
+        print (e)