polkit: Adjust message when authentication agent isn't found

When there isn't a ssh -X type session running and a user has not
been added to the libvirt group, attempts to run 'virsh -c qemu:///system'
commands from an otherwise unprivileged user will fail with rather
generic or opaque error message:

    "error: authentication failed: no agent is available to authenticate"

This patch will adjust the error code and message to help reflect the
situation that the problem is the requested mechanism is UNAVAILABLE and
a slightly more descriptive error. The result on a failure then becomes:

    "error: authentication unavailable: no polkit agent available to
            authenticate action 'org.libvirt.unix.manage'"

A bit more history on this - at one time a failure generated the
following type message when running the 'pkcheck' as a subprocess:

"error: authentication failed: polkit\56retains_authorization_after_challenge=1
Authorization requires authentication but no agent is available."

but, a patch was generated to adjust the error message to help provide
more details about what failed. This was pushed as commit id '96a108c9'.
That patch prepended a "polkit: " to the output. It really didn't solve
the problem, but gave a hint.

After some time it was deemed using DBus API calls directly was a
better way to go (since pkcheck calls them anyway). So, commit id
'1b854c76' (more or less) copied the code from remoteDispatchAuthPolkit
and adjusted it. Then commit id 'c7542573' adjusted the remote.c
code to call the new API (virPolkitCheckAuth). Finally, commit id
'308c0c5a' altered the code to call DBus APIs directly. In doing
so, it reverted the failing error message to the generic message
that would have been received from DBus anyway.

include/libvirt/virterror.h

@@ -4,7 +4,7 @@
  * Description: Provides the interfaces of the libvirt library to handle
  *              errors raised while using the library.
  *
- * Copyright (C) 2006-2015 Red Hat, Inc.
+ * Copyright (C) 2006-2016 Red Hat, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -310,6 +310,7 @@ typedef enum {
                                            CPU*/
     VIR_ERR_XML_INVALID_SCHEMA = 92,    /* XML document doesn't validate against schema */
     VIR_ERR_MIGRATE_FINISH_OK = 93,     /* Finish API succeeded but it is expected to return NULL */
+    VIR_ERR_AUTH_UNAVAILABLE = 94,	/* authentication unavailable */
 } virErrorNumber;
 
 /**

src/util/virerror.c

 /*
  * virerror.c: error handling and reporting code for libvirt
  *
- * Copyright (C) 2006, 2008-2015 Red Hat, Inc.
+ * Copyright (C) 2006, 2008-2016 Red Hat, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -1095,6 +1095,12 @@ virErrorMsg(virErrorNumber error, const char *info)
             else
                 errmsg = _("authentication cancelled: %s");
             break;
+        case VIR_ERR_AUTH_UNAVAILABLE:
+            if (info == NULL)
+                errmsg = _("authentication unavailable");
+            else
+                errmsg = _("authentication unavailable: %s");
+            break;
         case VIR_ERR_NO_STORAGE_POOL:
             if (info == NULL)
                 errmsg = _("Storage pool not found");

src/util/virpolkit.c

 /*
  * virpolkit.c: helpers for using polkit APIs
  *
- * Copyright (C) 2013, 2014 Red Hat, Inc.
+ * Copyright (C) 2013, 2014, 2016 Red Hat, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -121,8 +121,10 @@ int virPolkitCheckAuth(const char *actionid,
             virReportError(VIR_ERR_AUTH_CANCELLED, "%s",
                            _("user cancelled authentication process"));
         else if (is_challenge)
-            virReportError(VIR_ERR_AUTH_FAILED, "%s",
-                           _("no agent is available to authenticate"));
+            virReportError(VIR_ERR_AUTH_UNAVAILABLE,
+                           _("no polkit agent available to authenticate "
+                             "action '%s'"),
+                           actionid);
         else
             virReportError(VIR_ERR_AUTH_FAILED, "%s",
                            _("access denied by policy"));

tests/virpolkittest.c

 /*
- * Copyright (C) 2013, 2014 Red Hat, Inc.
+ * Copyright (C) 2013, 2014, 2016 Red Hat, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -220,8 +220,9 @@ static int testPolkitAuthChallenge(const void *opaque ATTRIBUTE_UNUSED)
     }
 
     err = virGetLastError();
-    if (!err || !strstr(err->message,
-                       _("no agent is available to authenticate"))) {
+    if (!err || err->domain != VIR_FROM_POLKIT ||
+        err->code != VIR_ERR_AUTH_UNAVAILABLE ||
+        !strstr(err->message, _("no polkit agent available to authenticate"))) {
         fprintf(stderr, "Incorrect error response\n");
         goto cleanup;
     }