Add SRP related code: authentication and registration

1 files changed, 154 insertions, 0 deletions

diff --git a/src/leap/crypto/srpregister.py b/src/leap/crypto/srpregister.py
new file mode 100644
index 00000000..d9b2b22b
--- /dev/null
+++ b/src/leap/crypto/srpregister.py
@@ -0,0 +1,154 @@
+# -*- coding: utf-8 -*-
+# srpregister.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/>.
+
+import requests
+import binascii
+import srp
+import logging
+
+from urlparse import urlparse
+
+from leap.config.providerconfig import ProviderConfig
+from leap.crypto.constants import SIGNUP_TIMEOUT
+
+logger = logging.getLogger(__name__)
+
+
+class SRPRegister(object):
+    """
+    Registers a user to a specific provider using SRP
+    """
+
+    USER_LOGIN_KEY = 'user[login]'
+    USER_VERIFIER_KEY = 'user[password_verifier]'
+    USER_SALT_KEY = 'user[password_salt]'
+
+    def __init__(self,
+                 provider_config=None,
+                 register_path="users"):
+        """
+        Constructor
+
+        @param provider_config: provider configuration instance,
+        properly loaded
+        @type privider_config: ProviderConfig
+        @param register_path: webapp path for registering users
+        @type register_path; str
+        """
+
+        assert provider_config, "Please provider a provider"
+        assert isinstance(provider_config, ProviderConfig), \
+            "We need a ProviderConfig instead of %r" % (provider_config,)
+
+        self._provider_config = provider_config
+
+        # **************************************************** #
+        # Dependency injection helpers, override this for more
+        # granular testing
+        self._fetcher = requests
+        self._srp = srp
+        self._hashfun = self._srp.SHA256
+        self._ng = self._srp.NG_1024
+        # **************************************************** #
+
+        parsed_url = urlparse(provider_config.get_api_uri())
+        self._provider = parsed_url.hostname
+        self._port = parsed_url.port
+
+        self._register_path = register_path
+
+        self._session = self._fetcher.session()
+
+    def _get_registration_uri(self):
+        """
+        Returns the URI where the register request should be made for
+        the provider
+
+        @rtype: str
+        """
+
+        if self._port:
+            uri = "https://%s:%s/%s/%s" % (
+                self._provider,
+                self._port,
+                self._provider_config.get_api_version(),
+                self._register_path)
+        else:
+            uri = "https://%s/%s/%s" % (
+                self._provider,
+                self._provider_config.get_api_version(),
+                self._register_path)
+
+        return uri
+
+    def register_user(self, username, password):
+        """
+        Registers a user with the validator based on the password provider
+
+        @param username: username to register
+        @type username: str
+        @param password: password for this username
+        @type password: str
+
+        @rtype: tuple
+        @rparam: (ok, request)
+        """
+        salt, verifier = self._srp.create_salted_verification_key(
+            username,
+            password,
+            self._hashfun,
+            self._ng)
+
+        user_data = {
+            self.USER_LOGIN_KEY: username,
+            self.USER_VERIFIER_KEY: binascii.hexlify(verifier),
+            self.USER_SALT_KEY: binascii.hexlify(salt)
+        }
+
+        uri = self._get_registration_uri()
+
+        logger.debug('Post to uri: %s' % uri)
+        logger.debug("Will try to register user = %s" % (username,))
+        logger.debug("user_data => %r" % (user_data,))
+
+        req = self._session.post(uri,
+                                 data=user_data,
+                                 timeout=SIGNUP_TIMEOUT,
+                                 verify=self._provider_config.
+                                 get_ca_cert_path())
+
+        return (req.ok, req)
+
+
+if __name__ == "__main__":
+    logger = logging.getLogger(name='leap')
+    logger.setLevel(logging.DEBUG)
+    console = logging.StreamHandler()
+    console.setLevel(logging.DEBUG)
+    formatter = logging.Formatter(
+        '%(asctime)s '
+        '- %(name)s - %(levelname)s - %(message)s')
+    console.setFormatter(formatter)
+    logger.addHandler(console)
+
+    provider = ProviderConfig()
+
+    if provider.load("leap/providers/bitmask.net/provider.json"):
+        register = SRPRegister(provider_config=provider)
+        print "Registering user..."
+        print register.register_user("test1", "sarasaaaa")
+        print register.register_user("test2", "sarasaaaa")