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samba-mirror/source4/auth/gensec/gensec_krb5_helpers.c
Joseph Sutton bbfbbb9f64 CVE-2022-2031 gensec_krb5: Add helper function to check if client sent an initial ticket
This will be used in the kpasswd service to ensure that the client has
an initial ticket to kadmin/changepw, and not a service ticket.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15047
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15049

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andreas Schneider <asn@samba.org>
2022-07-27 10:52:36 +00:00

73 lines
2.2 KiB
C

/*
Unix SMB/CIFS implementation.
Kerberos backend for GENSEC
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004
Copyright (C) Andrew Tridgell 2001
Copyright (C) Luke Howard 2002-2003
Copyright (C) Stefan Metzmacher 2004-2005
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/>.
*/
#include "includes.h"
#include "auth/auth.h"
#include "auth/gensec/gensec.h"
#include "auth/gensec/gensec_internal.h"
#include "gensec_krb5_internal.h"
#include "gensec_krb5_helpers.h"
#include "system/kerberos.h"
#include "auth/kerberos/kerberos.h"
static struct gensec_krb5_state *get_private_state(const struct gensec_security *gensec_security)
{
struct gensec_krb5_state *gensec_krb5_state = NULL;
if (strcmp(gensec_security->ops->name, "krb5") != 0) {
/* We require that the krb5 mechanism is being used. */
return NULL;
}
gensec_krb5_state = talloc_get_type(gensec_security->private_data,
struct gensec_krb5_state);
return gensec_krb5_state;
}
/*
* Returns 1 if our ticket has the initial flag set, 0 if not, and -1 in case of
* error.
*/
int gensec_krb5_initial_ticket(const struct gensec_security *gensec_security)
{
struct gensec_krb5_state *gensec_krb5_state = NULL;
gensec_krb5_state = get_private_state(gensec_security);
if (gensec_krb5_state == NULL) {
return -1;
}
if (gensec_krb5_state->ticket == NULL) {
/* We don't have a ticket */
return -1;
}
#ifdef SAMBA4_USES_HEIMDAL
return gensec_krb5_state->ticket->ticket.flags.initial;
#else /* MIT KERBEROS */
return (gensec_krb5_state->ticket->enc_part2->flags & TKT_FLG_INITIAL) ? 1 : 0;
#endif /* SAMBA4_USES_HEIMDAL */
}