[bug] return clearer errors when no cert found

2 files changed, 16 insertions, 5 deletions

diff --git a/src/leap/bitmask/vpn/_control.py b/src/leap/bitmask/vpn/_control.py
index a490934..6d4db96 100644
--- a/src/leap/bitmask/vpn/_control.py
+++ b/src/leap/bitmask/vpn/_control.py
@@ -61,11 +61,6 @@ class VPNControl(object):
             logger.info("Another vpn process is running. Will try to stop it.")
             vpnproc.stop_if_already_running()
 
-        # FIXME it would be good to document where the
-        # errors here are catched, since we currently handle them
-        # at the frontend layer. This *should* move to be handled entirely
-        # in the backend.
-
         try:
             cmd = vpnproc.getCommand()
         except Exception as e:
diff --git a/src/leap/bitmask/vpn/service.py b/src/leap/bitmask/vpn/service.py
index 2766b8c..026f459 100644
--- a/src/leap/bitmask/vpn/service.py
+++ b/src/leap/bitmask/vpn/service.py
@@ -35,6 +35,12 @@ from leap.common.files import check_and_fix_urw_only
 from leap.common.certs import get_cert_time_boundaries
 
 
+class ImproperlyConfigured(Exception):
+    """This error is a transient exception until autoconf automates all the
+    needed steps for VPN bootstrap."""
+    expected = True
+
+
 class VPNService(HookableService):
 
     name = 'vpn'
@@ -121,6 +127,8 @@ class VPNService(HookableService):
         try:
             _, provider = username.split('@')
         except ValueError:
+            if not username:
+                raise ValueError('Need an username. are you logged in?')
             raise ValueError(username + ' is not a valid username, it should'
                              ' contain an @')
 
@@ -163,6 +171,14 @@ class VPNService(HookableService):
         cert_path = key_path = os.path.join(prefix, "client", "openvpn.pem")
         ca_path = os.path.join(prefix, "ca", "cacert.pem")
 
+        if not os.path.isfile(cert_path):
+            raise ImproperlyConfigured(
+                'Cannot find client certificate. Please get one')
+        if not os.path.isfile(ca_path):
+            raise ImproperlyConfigured(
+                'Cannot find provider certificate. '
+                'Please configure provider.')
+
         self._vpn = VPNManager(provider, remotes, cert_path, key_path, ca_path,
                                extra_flags)