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smb3: warn on confusing error scenario with sec=krb5

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commit 0a018944eee913962bce8ffebbb121960d5125d9 upstream.

When mounting with Kerberos, users have been confused about the
default error returned in scenarios in which either keyutils is
not installed or the user did not properly acquire a krb5 ticket.
Log a warning message in the case that "ENOKEY" is returned
from the get_spnego_key upcall so that users can better understand
why mount failed in those two cases.

CC: Stable <stable@vger.kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Steve French 2020-07-16 00:34:21 -05:00 committed by Greg Kroah-Hartman
parent f61e1c3638
commit 582ee2cb6f
1 changed files with 2 additions and 0 deletions
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2
fs/cifs/smb2pdu.c
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@ -1323,6 +1323,8 @@ SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
spnego_key = cifs_get_spnego_key(ses);
if (IS_ERR(spnego_key)) {
rc = PTR_ERR(spnego_key);
if (rc == -ENOKEY)
cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
spnego_key = NULL;
goto out;
}