Commit 93e2e867 authored Oct 28, 2018 by Steve French Committed by Greg Kroah-Hartman Nov 13, 2018

smb3: on kerberos mount if server doesn't specify auth type use krb5



commit 926674de6705f0f1dbf29a62fd758d0977f535d6 upstream.

Some servers (e.g. Azure) do not include a spnego blob in the SMB3
negotiate protocol response, so on kerberos mounts ("sec=krb5")
we can fail, as we expected the server to list its supported
auth types (OIDs in the spnego blob in the negprot response).
Change this so that on krb5 mounts we default to trying krb5 if the
server doesn't list its supported protocol mechanisms.

Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
CC: Stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 108b981d

fs/cifs/cifs_spnego.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -147,8 +147,10 @@ cifs_get_spnego_key(struct cifs_ses *sesInfo)
		sprintf(dp, ";sec=krb5");
		else if (server->sec_mskerberos)
		sprintf(dp, ";sec=mskrb5");
		else
		goto out;
		else {
		cifs_dbg(VFS, "unknown or missing server auth type, use krb5\n");
		sprintf(dp, ";sec=krb5");
		}

		dp = description + strlen(description);
		sprintf(dp, ";uid=0x%x",