Changes to streamline the session creation and authenticate with the external srp leap library

8 files changed, 56 insertions, 242 deletions

diff --git a/service/pixelated/bitmask_libraries/auth.py b/service/pixelated/bitmask_libraries/auth.py
deleted file mode 100644
index 9a2fdcb2..00000000
--- a/service/pixelated/bitmask_libraries/auth.py
+++ /dev/null
@@ -1,42 +0,0 @@
-#
-# Copyright (c) 2014 ThoughtWorks, Inc.
-#
-# Pixelated is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# Pixelated 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 Affero General Public License for more details.
-#
-# You should have received a copy of the GNU Affero General Public License
-# along with Pixelated. If not, see <http://www.gnu.org/licenses/>.
-from .leap_srp import LeapSecureRemotePassword
-from .certs import which_api_CA_bundle
-
-USE_PASSWORD = None
-
-
-class LeapCredentials(object):
-    def __init__(self, user_name, password, db_passphrase=USE_PASSWORD):
-        self.user_name = user_name
-        self.password = password
-        self.db_passphrase = db_passphrase if db_passphrase is not None else password
-
-
-class LeapAuthenticator(object):
-    def __init__(self, provider):
-        self._provider = provider
-
-    def authenticate(self, credentials):
-        config = self._provider.config
-        srp = LeapSecureRemotePassword(ca_bundle=which_api_CA_bundle(self._provider), timeout_in_s=config.timeout_in_s)
-        srp_session = srp.authenticate(self._provider.api_uri, credentials.user_name, credentials.password)
-        return srp_session
-
-    def register(self, credentials):
-        config = self._provider.config
-        srp = LeapSecureRemotePassword(ca_bundle=which_api_CA_bundle(self._provider), timeout_in_s=config.timeout_in_s)
-        srp.register(self._provider.api_uri, credentials.user_name, credentials.password)
diff --git a/service/pixelated/bitmask_libraries/leap_srp.py b/service/pixelated/bitmask_libraries/leap_srp.py
deleted file mode 100644
index 7a627c1d..00000000
--- a/service/pixelated/bitmask_libraries/leap_srp.py
+++ /dev/null
@@ -1,147 +0,0 @@
-#
-# Copyright (c) 2014 ThoughtWorks, Inc.
-#
-# Pixelated is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# Pixelated 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 Affero General Public License for more details.
-#
-# You should have received a copy of the GNU Affero General Public License
-# along with Pixelated. If not, see <http://www.gnu.org/licenses/>.
-import binascii
-import json
-
-import requests
-from requests import Session
-from srp import User, srp, create_salted_verification_key
-from requests.exceptions import HTTPError, SSLError, Timeout
-from config import SYSTEM_CA_BUNDLE
-
-
-REGISTER_USER_LOGIN_KEY = 'user[login]'
-REGISTER_USER_VERIFIER_KEY = 'user[password_verifier]'
-REGISTER_USER_SALT_KEY = 'user[password_salt]'
-
-
-class LeapAuthException(Exception):
-    def __init__(self, *args, **kwargs):
-        super(LeapAuthException, self).__init__(*args, **kwargs)
-
-
-class LeapSRPSession(object):
-    def __init__(self, user_name, api_server_name, uuid, token, session_id, api_version='1'):
-        self.user_name = user_name
-        self.api_server_name = api_server_name
-        self.uuid = uuid
-        self.token = token
-        self.session_id = session_id
-        self.api_version = api_version
-
-    def __str__(self):
-        return 'LeapSRPSession(%s, %s, %s, %s, %s, %s)' % (self.user_name, self.api_server_name, self.uuid, self.token, self.session_id, self.api_version)
-
-
-class LeapSecureRemotePassword(object):
-    def __init__(self, hash_alg=srp.SHA256, ng_type=srp.NG_1024, ca_bundle=SYSTEM_CA_BUNDLE, timeout_in_s=15,
-                 leap_api_version='1'):
-
-        self.hash_alg = hash_alg
-        self.ng_type = ng_type
-        self.timeout_in_s = timeout_in_s
-        self.ca_bundle = ca_bundle
-        self.leap_api_version = leap_api_version
-
-    def authenticate(self, api_uri, username, password):
-        session = Session()
-        try:
-            return self._authenticate_with_session(session, api_uri, username, password)
-        except Timeout, e:
-            raise LeapAuthException(e)
-        finally:
-            session.close()
-
-    def _authenticate_with_session(self, http_session, api_uri, username, password):
-        try:
-            srp_user = User(username.encode('utf-8'), password.encode('utf-8'), self.hash_alg, self.ng_type)
-
-            salt, B_challenge = self._begin_authentication(srp_user, http_session, api_uri)
-            M2_verfication_code, leap_session = self._process_challenge(srp_user, http_session, api_uri, salt,
-                                                                        B_challenge)
-            self._verify_session(srp_user, M2_verfication_code)
-
-            return leap_session
-        except (HTTPError, SSLError), e:
-            raise LeapAuthException(e)
-
-    def _begin_authentication(self, user, session, api_uri):
-        _, A = user.start_authentication()
-
-        auth_data = {
-            "login": user.get_username(),
-            "A": binascii.hexlify(A)
-        }
-        session_url = '%s/%s/sessions' % (api_uri, self.leap_api_version)
-        response = session.post(session_url, data=auth_data, verify=self.ca_bundle, timeout=self.timeout_in_s)
-        response.raise_for_status()
-        json_content = json.loads(response.content)
-
-        salt = _safe_unhexlify(json_content.get('salt'))
-        B = _safe_unhexlify(json_content.get('B'))
-
-        return salt, B
-
-    def _process_challenge(self, user, session, api_uri, salt, B):
-        M = user.process_challenge(salt, B)
-
-        auth_data = {
-            "client_auth": binascii.hexlify(M)
-        }
-
-        auth_url = '%s/%s/sessions/%s' % (api_uri, self.leap_api_version, user.get_username())
-        response = session.put(auth_url, data=auth_data, verify=self.ca_bundle, timeout=self.timeout_in_s)
-        response.raise_for_status()
-        auth_json = json.loads(response.content)
-
-        M2 = _safe_unhexlify(auth_json.get('M2'))
-        uuid = auth_json.get('id')
-        token = auth_json.get('token')
-        session_id = response.cookies.get('_session_id')
-
-        return M2, LeapSRPSession(user.get_username(), api_uri, uuid, token, session_id)
-
-    def _verify_session(self, user, M2):
-        user.verify_session(M2)
-        if not user.authenticated():
-            raise LeapAuthException()
-
-    def register(self, api_uri, username, password):
-        try:
-            salt, verifier = create_salted_verification_key(username, password, self.hash_alg, self.ng_type)
-            return self._post_registration_data(api_uri, username, salt, verifier)
-        except (HTTPError, SSLError, Timeout), e:
-            raise LeapAuthException(e)
-
-    def _post_registration_data(self, api_uri, username, salt, verifier):
-        users_url = '%s/%s/users' % (api_uri, self.leap_api_version)
-
-        user_data = {
-            REGISTER_USER_LOGIN_KEY: username,
-            REGISTER_USER_SALT_KEY: binascii.hexlify(salt),
-            REGISTER_USER_VERIFIER_KEY: binascii.hexlify(verifier)
-        }
-
-        response = requests.post(users_url, data=user_data, verify=self.ca_bundle, timeout=self.timeout_in_s)
-        response.raise_for_status()
-        reg_json = json.loads(response.content)
-
-        return reg_json['ok']
-
-
-def _safe_unhexlify(hex_str):
-    return binascii.unhexlify(hex_str) \
-        if (len(hex_str) % 2 == 0) else binascii.unhexlify('0' + hex_str)
diff --git a/service/pixelated/bitmask_libraries/nicknym.py b/service/pixelated/bitmask_libraries/nicknym.py
index ef846bba..bee90897 100644
--- a/service/pixelated/bitmask_libraries/nicknym.py
+++ b/service/pixelated/bitmask_libraries/nicknym.py
@@ -18,14 +18,14 @@ from .certs import which_api_CA_bundle
 
 
 class NickNym(object):
-    def __init__(self, provider, config, soledad_session, srp_session):
+    def __init__(self, provider, config, soledad_session, username, token, uuid):
         nicknym_url = _discover_nicknym_server(provider)
-        self._email = '%s@%s' % (srp_session.user_name, provider.domain)
-        self.keymanager = KeyManager('%s@%s' % (srp_session.user_name, provider.domain), nicknym_url,
+        self._email = '%s@%s' % (username, provider.domain)
+        self.keymanager = KeyManager('%s@%s' % (username, provider.domain), nicknym_url,
                                      soledad_session.soledad,
-                                     srp_session.token, which_api_CA_bundle(provider), provider.api_uri,
+                                     token, which_api_CA_bundle(provider), provider.api_uri,
                                      provider.api_version,
-                                     srp_session.uuid, config.gpg_binary)
+                                     uuid, config.gpg_binary)
 
     def generate_openpgp_key(self):
         if not self._key_exists(self._email):
diff --git a/service/pixelated/bitmask_libraries/provider.py b/service/pixelated/bitmask_libraries/provider.py
index a0bf4843..1564c974 100644
--- a/service/pixelated/bitmask_libraries/provider.py
+++ b/service/pixelated/bitmask_libraries/provider.py
@@ -25,6 +25,7 @@ class LeapProvider(object):
     def __init__(self, server_name, config):
         self.server_name = server_name
         self.config = config
+        self.local_ca_crt = '%s/ca.crt' % self.config.leap_home
 
         self.provider_json = self.fetch_provider_json()
 
@@ -62,12 +63,13 @@ class LeapProvider(object):
         if 'mx' not in self.services:
             raise Exception
 
-    def download_certificate_to(self, filename):
+    def download_certificate(self, filename=None):
         """
         Downloads the server certificate, validates it against the provided fingerprint and stores it to file
         """
+        path = filename or self.local_ca_crt
         cert = self.fetch_valid_certificate()
-        with open(filename, 'w') as out:
+        with open(path, 'w') as out:
             out.write(cert)
 
     def fetch_valid_certificate(self):
diff --git a/service/pixelated/bitmask_libraries/register.py b/service/pixelated/bitmask_libraries/register.py
index bb54477f..add58acc 100644
--- a/service/pixelated/bitmask_libraries/register.py
+++ b/service/pixelated/bitmask_libraries/register.py
@@ -21,14 +21,15 @@ import os.path
 import pixelated.bitmask_libraries.session as LeapSession
 from pixelated.bitmask_libraries.config import LeapConfig
 from pixelated.bitmask_libraries.provider import LeapProvider
-from pixelated.bitmask_libraries.auth import LeapAuthenticator, LeapCredentials
+from leap.srp_auth import SRPAuth
 
 
 def register_new_user(username, server_name):
     config = LeapConfig()
     provider = LeapProvider(server_name, config)
     password = getpass.getpass('Please enter password for %s: ' % username)
-    LeapAuthenticator(provider).register(LeapCredentials(username, password))
+    srp_auth = SRPAuth(provider, provider.local_ca_crt)
+    srp_auth.register(username, password)
 
     session = LeapSession.open(username, password, server_name)
     session.nicknym.generate_openpgp_key()
diff --git a/service/pixelated/bitmask_libraries/session.py b/service/pixelated/bitmask_libraries/session.py
index eb6f39d7..f8e2b03e 100644
--- a/service/pixelated/bitmask_libraries/session.py
+++ b/service/pixelated/bitmask_libraries/session.py
@@ -27,7 +27,8 @@ from pixelated.bitmask_libraries.provider import LeapProvider
 from pixelated.bitmask_libraries.certs import refresh_ca_bundle
 from twisted.internet import reactor
 from .nicknym import NickNym
-from .auth import LeapAuthenticator, LeapCredentials
+from leap.srp_auth import SRPAuth
+# from .auth import LeapAuthenticator, LeapCredentials
 from .soledad import SoledadSessionFactory, SoledadSession
 from .smtp import LeapSmtp
 from .config import DEFAULT_LEAP_HOME
@@ -40,7 +41,7 @@ def open(username, password, server_name, leap_home=DEFAULT_LEAP_HOME):
     config = LeapConfig(leap_home=leap_home)
     provider = LeapProvider(server_name, config)
     refresh_ca_bundle(provider)
-    session = LeapSessionFactory(provider).create(LeapCredentials(username, password))
+    session = LeapSessionFactory(provider).create(username, password)
 
     return session
 
@@ -65,7 +66,7 @@ class LeapSession(object):
     - ``incoming_mail_fetcher`` Background job for fetching incoming mails from LEAP server (LeapIncomingMail)
     """
 
-    def __init__(self, provider, srp_session, soledad_session, nicknym, soledad_account, incoming_mail_fetcher, smtp):
+    def __init__(self, provider, user_auth, soledad_session, nicknym, soledad_account, incoming_mail_fetcher, smtp):
         """
         Constructor.
 
@@ -76,7 +77,7 @@ class LeapSession(object):
         self.smtp = smtp
         self.config = provider.config
         self.provider = provider
-        self.srp_session = srp_session
+        self.user_auth = user_auth
         self.soledad_session = soledad_session
         self.nicknym = nicknym
         self.account = soledad_account
@@ -87,7 +88,7 @@ class LeapSession(object):
 
     def account_email(self):
         domain = self.provider.domain
-        name = self.srp_session.user_name
+        name = self.user_auth.username
         return '%s@%s' % (name, domain)
 
     def close(self):
@@ -112,28 +113,29 @@ class LeapSessionFactory(object):
         self._provider = provider
         self._config = provider.config
 
-    def create(self, credentials):
-        key = self._session_key(credentials)
+    def create(self, username, password):
+        key = self._session_key(username)
         session = self._lookup_session(key)
         if not session:
-            session = self._create_new_session(credentials)
+            session = self._create_new_session(username, password)
             self._remember_session(key, session)
 
         return session
 
-    def _create_new_session(self, credentials):
+    def _create_new_session(self, username, password):
         self._create_dir(self._provider.config.leap_home)
-        self._provider.download_certificate_to('%s/ca.crt' % self._provider.config.leap_home)
+        self._provider.download_certificate()
 
-        auth = LeapAuthenticator(self._provider).authenticate(credentials)
-        soledad = SoledadSessionFactory.create(self._provider, auth, credentials.db_passphrase)
+        srp_auth = SRPAuth(self._provider.api_uri, self._provider.local_ca_crt)
+        auth = srp_auth.authenticate(username, password)
 
-        nicknym = self._create_nicknym(auth, soledad)
-        account = self._create_account(auth, soledad)
-        incoming_mail_fetcher = self._create_incoming_mail_fetcher(nicknym, soledad,
-                                                                   account, auth)
+        soledad = SoledadSessionFactory.create(self._provider, auth.token, auth.uuid, password)
 
-        smtp = LeapSmtp(self._provider, nicknym.keymanager, auth)
+        nicknym = self._create_nicknym(auth.username, auth.token, auth.uuid, soledad)
+        account = self._create_account(auth.uuid, soledad)
+        incoming_mail_fetcher = self._create_incoming_mail_fetcher(nicknym, soledad, account, auth.username)
+
+        smtp = LeapSmtp(self._provider, auth.username, auth.session_id, nicknym.keymanager)
 
         smtp.ensure_running()
 
@@ -150,8 +152,8 @@ class LeapSessionFactory(object):
         global SESSIONS
         SESSIONS[key] = session
 
-    def _session_key(self, credentials):
-        return hash((self._provider, credentials.user_name))
+    def _session_key(self, username):
+        return hash((self._provider, username))
 
     def _create_dir(self, path):
         try:
@@ -162,21 +164,17 @@ class LeapSessionFactory(object):
             else:
                 raise
 
-    def _create_soledad_session(self, srp_session, db_passphrase):
-        return SoledadSession(self._provider, db_passphrase, srp_session)
-
-    def _create_nicknym(self, srp_session, soledad_session):
-        return NickNym(self._provider, self._config, soledad_session, srp_session)
+    def _create_nicknym(self, username, token, uuid, soledad_session):
+        return NickNym(self._provider, self._config, soledad_session, username, token, uuid)
 
-    def _create_account(self, srp_session, soledad_session):
+    def _create_account(self, uuid, soledad_session):
         memstore = MemoryStore(permanent_store=SoledadStore(soledad_session.soledad))
-        return SoledadBackedAccount(srp_session.uuid, soledad_session.soledad, memstore)
+        return SoledadBackedAccount(uuid, soledad_session.soledad, memstore)
 
-    def _create_incoming_mail_fetcher(self, nicknym, soledad_session, account, auth):
+    def _create_incoming_mail_fetcher(self, nicknym, soledad_session, account, username):
         return LeapIncomingMail(nicknym.keymanager, soledad_session.soledad, account,
-                                self._config.fetch_interval_in_s, self._account_email(auth))
+                                self._config.fetch_interval_in_s, self._account_email(username))
 
-    def _account_email(self, auth):
+    def _account_email(self, username):
         domain = self._provider.domain
-        name = auth.user_name
-        return '%s@%s' % (name, domain)
+        return '%s@%s' % (username, domain)
diff --git a/service/pixelated/bitmask_libraries/smtp.py b/service/pixelated/bitmask_libraries/smtp.py
index ba5e7102..a0f9c6e4 100644
--- a/service/pixelated/bitmask_libraries/smtp.py
+++ b/service/pixelated/bitmask_libraries/smtp.py
@@ -27,10 +27,11 @@ class LeapSmtp(object):
 
     TWISTED_PORT = 4650
 
-    def __init__(self, provider, keymanager=None, leap_srp_session=None):
+    def __init__(self, provider, username, session_id, keymanager=None):
         self._provider = provider
+        self.username = username
+        self.session_id = session_id
         self._keymanager = keymanager
-        self._srp_session = leap_srp_session
         self._hostname, self._port = self._discover_smtp_server()
         self._smtp_port = None
         self._smtp_service = None
@@ -56,7 +57,7 @@ class LeapSmtp(object):
             os.makedirs(os.path.dirname(cert_path))
 
         cert_url = '%s/%s/cert' % (self._provider.api_uri, self._provider.api_version)
-        cookies = {"_session_id": self._srp_session.session_id}
+        cookies = {"_session_id": self.session_id}
 
         response = requests.get(cert_url, verify=which_api_CA_bundle(self._provider), cookies=cookies, timeout=self._provider.config.timeout_in_s)
         response.raise_for_status()
@@ -76,7 +77,7 @@ class LeapSmtp(object):
     def start(self):
         self._download_client_certificates()
         cert_path = self._client_cert_path()
-        email = '%s@%s' % (self._srp_session.user_name, self._provider.domain)
+        email = '%s@%s' % (self.username, self._provider.domain)
 
         self._smtp_service, self._smtp_port = setup_smtp_gateway(
             port=self.TWISTED_PORT,
diff --git a/service/pixelated/bitmask_libraries/soledad.py b/service/pixelated/bitmask_libraries/soledad.py
index 83a8caa9..f3fca95a 100644
--- a/service/pixelated/bitmask_libraries/soledad.py
+++ b/service/pixelated/bitmask_libraries/soledad.py
@@ -46,15 +46,16 @@ class LeapKeyManager(object):
 
 class SoledadSessionFactory(object):
     @classmethod
-    def create(cls, provider, srp_session, encryption_passphrase):
-        return SoledadSession(provider, encryption_passphrase, srp_session)
+    def create(cls, provider, user_token, user_uuid, encryption_passphrase):
+        return SoledadSession(provider, encryption_passphrase, user_token, user_uuid)
 
 
 class SoledadSession(object):
-    def __init__(self, provider, encryption_passphrase, leap_srp_session):
+    def __init__(self, provider, encryption_passphrase, user_token, user_uuid):
         self.provider = provider
         self.config = provider.config
-        self.leap_srp_session = leap_srp_session
+        self.user_uuid = user_uuid
+        self.user_token = user_token
 
         self.soledad = self._init_soledad(encryption_passphrase)
 
@@ -66,8 +67,8 @@ class SoledadSession(object):
             secrets = self._secrets_path()
             local_db = self._local_db_path()
 
-            return Soledad(self.leap_srp_session.uuid, unicode(encryption_passphrase), secrets,
-                           local_db, server_url, which_api_CA_bundle(self.provider), self.leap_srp_session.token, defer_encryption=False)
+            return Soledad(self.user_uuid, unicode(encryption_passphrase), secrets,
+                           local_db, server_url, which_api_CA_bundle(self.provider), self.user_token, defer_encryption=False)
 
         except (WrongMac, UnknownMacMethod), e:
             raise SoledadWrongPassphraseException(e)
@@ -76,10 +77,10 @@ class SoledadSession(object):
         return "%s/soledad" % self.config.leap_home
 
     def _secrets_path(self):
-        return "%s/%s.secret" % (self._leap_path(), self.leap_srp_session.uuid)
+        return "%s/%s.secret" % (self._leap_path(), self.user_uuid)
 
     def _local_db_path(self):
-        return "%s/%s.db" % (self._leap_path(), self.leap_srp_session.uuid)
+        return "%s/%s.db" % (self._leap_path(), self.user_uuid)
 
     def _create_database_dir(self):
         try:
@@ -102,7 +103,7 @@ class SoledadSession(object):
             host = hosts.keys()[0]
             server_url = 'https://%s:%d/user-%s' % \
                          (hosts[host]['hostname'], hosts[host]['port'],
-                          self.leap_srp_session.uuid)
+                          self.user_uuid)
             return server_url
         except Exception, e:
             raise SoledadDiscoverException(e)