download cert for SMTP if EIP did not do it.

includes refactor of common code for download of certificates
and config files.

1 files changed, 80 insertions, 0 deletions

diff --git a/src/leap/bitmask/crypto/certs.py b/src/leap/bitmask/crypto/certs.py
new file mode 100644
index 00000000..244decfd
--- /dev/null
+++ b/src/leap/bitmask/crypto/certs.py
@@ -0,0 +1,80 @@
+# -*- coding: utf-8 -*-
+# certs.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/>.
+"""
+Utilities for dealing with client certs
+"""
+import logging
+import os
+
+from leap.bitmask.crypto.srpauth import SRPAuth
+from leap.bitmask.util.constants import REQUEST_TIMEOUT
+from leap.common.files import check_and_fix_urw_only
+from leap.common.files import mkdir_p
+
+from leap.common import certs as leap_certs
+
+logger = logging.getLogger(__name__)
+
+
+def download_client_cert(provider_config, path, session):
+    """
+    Downloads the client certificate for each service.
+
+    :param provider_config: instance of a ProviderConfig
+    :type provider_config: ProviderConfig
+    :param path: the path to download the cert to.
+    :type path: str
+    :param session: a fetcher.session instance. For the moment we only
+                   support requests.sessions
+    :type session: requests.sessions.Session
+    """
+    # TODO we should implement the @with_srp_auth decorator
+    # again.
+    srp_auth = SRPAuth(provider_config)
+    session_id = srp_auth.get_session_id()
+    cookies = None
+    if session_id:
+        cookies = {"_session_id": session_id}
+    cert_uri = "%s/%s/cert" % (
+        provider_config.get_api_uri(),
+        provider_config.get_api_version())
+    logger.debug('getting cert from uri: %s' % cert_uri)
+
+    res = session.get(cert_uri,
+                      verify=provider_config
+                      .get_ca_cert_path(),
+                      cookies=cookies,
+                      timeout=REQUEST_TIMEOUT)
+    res.raise_for_status()
+    client_cert = res.content
+
+    if not leap_certs.is_valid_pemfile(client_cert):
+        # XXX raise more specific exception.
+        raise Exception("The downloaded certificate is not a "
+                        "valid PEM file")
+
+    mkdir_p(os.path.dirname(path))
+
+    try:
+        with open(path, "w") as f:
+            f.write(client_cert)
+    except IOError as exc:
+        logger.error(
+            "Error saving client cert: %r" % (exc,))
+        raise
+
+    check_and_fix_urw_only(path)