Add email firewall

1 files changed, 115 insertions, 0 deletions

diff --git a/src/leap/bitmask/services/mail/emailfirewall.py b/src/leap/bitmask/services/mail/emailfirewall.py
new file mode 100644
index 00000000..2cd2ec31
--- /dev/null
+++ b/src/leap/bitmask/services/mail/emailfirewall.py
@@ -0,0 +1,115 @@
+# -*- coding: utf-8 -*-
+# emailfirewall.py
+# Copyright (C) 2014 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/>.
+"""
+Email firewall implementation.
+"""
+
+import os
+import subprocess
+
+from abc import ABCMeta, abstractmethod
+
+from leap.bitmask.config import flags
+from leap.bitmask.platform_init import IS_LINUX
+from leap.bitmask.util import first, force_eval
+from leap.bitmask.util.privilege_policies import LinuxPolicyChecker
+from leap.common.check import leap_assert
+
+
+def get_email_firewall():
+    """
+    Return the email firewall handler for the current platform.
+    """
+    if not (IS_LINUX):
+        error_msg = "Email firewall not implemented for this platform."
+        raise NotImplementedError(error_msg)
+
+    firewall = None
+    if IS_LINUX:
+        firewall = LinuxEmailFirewall
+
+    leap_assert(firewall is not None)
+
+    return firewall()
+
+
+class EmailFirewall(object):
+    """
+    Abstract email firwall class
+    """
+    __metaclass__ = ABCMeta
+
+    @abstractmethod
+    def start(self):
+        """
+        Start email firewall
+        """
+        return False
+
+    @abstractmethod
+    def stop(self):
+        """
+        Stop email firewall
+        """
+        return False
+
+
+class EmailFirewallException(Exception):
+    pass
+
+
+class LinuxEmailFirewall(EmailFirewall):
+
+    class BITMASK_ROOT(object):
+        def __call__(self):
+            return ("/usr/local/sbin/bitmask-root" if flags.STANDALONE else
+                    "/usr/sbin/bitmask-root")
+
+    def start(self):
+        uid = str(os.getuid())
+        return True if self._run(["start", uid]) is 0 else False
+
+    def stop(self):
+        return True if self._run(["stop"]) is 0 else False
+
+    def _run(self, cmd):
+        """
+        Run an email firewall command with bitmask-root
+
+        Might raise:
+            NoPkexecAvailable,
+            NoPolkitAuthAgentAvailable,
+
+        :param cmd: command to send to bitmask-root fw-email
+        :type cmd: [str]
+        :returns: exit code of bitmask-root
+        :rtype: int
+        """
+        command = []
+
+        policyChecker = LinuxPolicyChecker()
+        pkexec = policyChecker.maybe_pkexec()
+        if pkexec:
+            command.append(first(pkexec))
+
+        command.append(force_eval(self.BITMASK_ROOT))
+        command.append("fw-email")
+        command += cmd
+
+        # XXX: will be nice to use twisted ProcessProtocol instead of
+        #      subprocess to avoid blocking until it finish
+        return subprocess.call(command)