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Code

libcli/auth Move PAC parsing and verification in common.

Browse Source 
This uses the source3 PAC code (originally from Samba4) with some
small changes to restore functionality needed by the torture tests,
and to have a common API.

Andrew Bartlett
This commit is contained in:
Andrew Bartlett 2011-04-20 12:05:27 +10:00
parent 0e5482c791
commit f28f5db15a
12 changed files with 408 additions and 689 deletions
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358
libcli/auth/kerberos_pac.c Normal file
View File

@ -0,0 +1,358 @@
/*
Unix SMB/CIFS implementation.
kerberos authorization data (PAC) utility library
Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
Copyright (C) Andrew Tridgell 2001
Copyright (C) Luke Howard 2002-2003
Copyright (C) Stefan Metzmacher 2004-2005
Copyright (C) Guenther Deschner 2005,2007,2008
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"
#ifdef HAVE_KRB5
#include "librpc/gen_ndr/ndr_krb5pac.h"
#include "libcli/auth/krb5_wrap.h"
krb5_error_code check_pac_checksum(TALLOC_CTX *mem_ctx,
DATA_BLOB pac_data,
struct PAC_SIGNATURE_DATA *sig,
krb5_context context,
const krb5_keyblock *keyblock)
{
krb5_error_code ret;
krb5_checksum cksum;
krb5_keyusage usage = 0;
smb_krb5_checksum_from_pac_sig(&cksum, sig);
#ifdef HAVE_KRB5_KU_OTHER_CKSUM /* Heimdal */
usage = KRB5_KU_OTHER_CKSUM;
#elif defined(HAVE_KRB5_KEYUSAGE_APP_DATA_CKSUM) /* MIT */
usage = KRB5_KEYUSAGE_APP_DATA_CKSUM;
#else
#error UNKNOWN_KRB5_KEYUSAGE
#endif
ret = smb_krb5_verify_checksum(context,
keyblock,
usage,
&cksum,
pac_data.data,
pac_data.length);
if (ret) {
DEBUG(2,("check_pac_checksum: PAC Verification failed: %s (%d)\n",
error_message(ret), ret));
return ret;
}
return ret;
}
/**
* @brief Decode a blob containing a NDR envoded PAC structure
*
* @param mem_ctx - The memory context
* @param pac_data_blob - The data blob containing the NDR encoded data
* @param context - The Kerberos Context
* @param service_keyblock - The Service Key used to verify the checksum
* @param client_principal - The client principal
* @param tgs_authtime - The ticket timestamp
* @param pac_data_out - [out] The decoded PAC
*
* @return - A NTSTATUS error code
*/
NTSTATUS kerberos_decode_pac(TALLOC_CTX *mem_ctx,
DATA_BLOB pac_data_blob,
krb5_context context,
const krb5_keyblock *krbtgt_keyblock,
const krb5_keyblock *service_keyblock,
krb5_const_principal client_principal,
time_t tgs_authtime,
struct PAC_DATA **pac_data_out)
{
NTSTATUS status;
enum ndr_err_code ndr_err;
krb5_error_code ret;
DATA_BLOB modified_pac_blob;
NTTIME tgs_authtime_nttime;
krb5_principal client_principal_pac = NULL;
int i;
struct PAC_SIGNATURE_DATA *srv_sig_ptr = NULL;
struct PAC_SIGNATURE_DATA *kdc_sig_ptr = NULL;
struct PAC_SIGNATURE_DATA *srv_sig_wipe = NULL;
struct PAC_SIGNATURE_DATA *kdc_sig_wipe = NULL;
struct PAC_LOGON_NAME *logon_name = NULL;
struct PAC_LOGON_INFO *logon_info = NULL;
struct PAC_DATA *pac_data = NULL;
struct PAC_DATA_RAW *pac_data_raw = NULL;
DATA_BLOB *srv_sig_blob = NULL;
DATA_BLOB *kdc_sig_blob = NULL;
bool bool_ret;
*pac_data_out = NULL;
pac_data = talloc(mem_ctx, struct PAC_DATA);
pac_data_raw = talloc(mem_ctx, struct PAC_DATA_RAW);
kdc_sig_wipe = talloc(mem_ctx, struct PAC_SIGNATURE_DATA);
srv_sig_wipe = talloc(mem_ctx, struct PAC_SIGNATURE_DATA);
if (!pac_data_raw || !pac_data || !kdc_sig_wipe || !srv_sig_wipe) {
return NT_STATUS_NO_MEMORY;
}
ndr_err = ndr_pull_struct_blob(&pac_data_blob, pac_data, pac_data,
(ndr_pull_flags_fn_t)ndr_pull_PAC_DATA);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(0,("can't parse the PAC: %s\n",
nt_errstr(status)));
return status;
}
if (pac_data->num_buffers < 4) {
/* we need logon_ingo, service_key and kdc_key */
DEBUG(0,("less than 4 PAC buffers\n"));
return NT_STATUS_INVALID_PARAMETER;
}
ndr_err = ndr_pull_struct_blob(
&pac_data_blob, pac_data_raw, pac_data_raw,
(ndr_pull_flags_fn_t)ndr_pull_PAC_DATA_RAW);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(0,("can't parse the PAC: %s\n",
nt_errstr(status)));
return status;
}
if (pac_data_raw->num_buffers < 4) {
/* we need logon_ingo, service_key and kdc_key */
DEBUG(0,("less than 4 PAC buffers\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (pac_data->num_buffers != pac_data_raw->num_buffers) {
/* we need logon_ingo, service_key and kdc_key */
DEBUG(0, ("misparse! PAC_DATA has %d buffers while "
"PAC_DATA_RAW has %d\n", pac_data->num_buffers,
pac_data_raw->num_buffers));
return NT_STATUS_INVALID_PARAMETER;
}
for (i=0; i < pac_data->num_buffers; i++) {
struct PAC_BUFFER *data_buf = &pac_data->buffers[i];
struct PAC_BUFFER_RAW *raw_buf = &pac_data_raw->buffers[i];
if (data_buf->type != raw_buf->type) {
DEBUG(0, ("misparse! PAC_DATA buffer %d has type "
"%d while PAC_DATA_RAW has %d\n", i,
data_buf->type, raw_buf->type));
return NT_STATUS_INVALID_PARAMETER;
}
switch (data_buf->type) {
case PAC_TYPE_LOGON_INFO:
if (!data_buf->info) {
break;
}
logon_info = data_buf->info->logon_info.info;
break;
case PAC_TYPE_SRV_CHECKSUM:
if (!data_buf->info) {
break;
}
srv_sig_ptr = &data_buf->info->srv_cksum;
srv_sig_blob = &raw_buf->info->remaining;
break;
case PAC_TYPE_KDC_CHECKSUM:
if (!data_buf->info) {
break;
}
kdc_sig_ptr = &data_buf->info->kdc_cksum;
kdc_sig_blob = &raw_buf->info->remaining;
break;
case PAC_TYPE_LOGON_NAME:
logon_name = &data_buf->info->logon_name;
break;
default:
break;
}
}
if (!logon_info) {
DEBUG(0,("PAC no logon_info\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (!logon_name) {
DEBUG(0,("PAC no logon_name\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (!srv_sig_ptr || !srv_sig_blob) {
DEBUG(0,("PAC no srv_key\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (!kdc_sig_ptr || !kdc_sig_blob) {
DEBUG(0,("PAC no kdc_key\n"));
return NT_STATUS_INVALID_PARAMETER;
}
/* Find and zero out the signatures,
* as required by the signing algorithm */
/* We find the data blobs above,
* now we parse them to get at the exact portion we should zero */
ndr_err = ndr_pull_struct_blob(
kdc_sig_blob, kdc_sig_wipe, kdc_sig_wipe,
(ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(0,("can't parse the KDC signature: %s\n",
nt_errstr(status)));
return status;
}
ndr_err = ndr_pull_struct_blob(
srv_sig_blob, srv_sig_wipe, srv_sig_wipe,
(ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(0,("can't parse the SRV signature: %s\n",
nt_errstr(status)));
return status;
}
/* Now zero the decoded structure */
memset(kdc_sig_wipe->signature.data,
'\0', kdc_sig_wipe->signature.length);
memset(srv_sig_wipe->signature.data,
'\0', srv_sig_wipe->signature.length);
/* and reencode, back into the same place it came from */
ndr_err = ndr_push_struct_blob(
kdc_sig_blob, pac_data_raw, kdc_sig_wipe,
(ndr_push_flags_fn_t)ndr_push_PAC_SIGNATURE_DATA);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(0,("can't repack the KDC signature: %s\n",
nt_errstr(status)));
return status;
}
ndr_err = ndr_push_struct_blob(
srv_sig_blob, pac_data_raw, srv_sig_wipe,
(ndr_push_flags_fn_t)ndr_push_PAC_SIGNATURE_DATA);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(0,("can't repack the SRV signature: %s\n",
nt_errstr(status)));
return status;
}
/* push out the whole structure, but now with zero'ed signatures */
ndr_err = ndr_push_struct_blob(
&modified_pac_blob, pac_data_raw, pac_data_raw,
(ndr_push_flags_fn_t)ndr_push_PAC_DATA_RAW);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(0,("can't repack the RAW PAC: %s\n",
nt_errstr(status)));
return status;
}
/* verify by service_key */
ret = check_pac_checksum(mem_ctx,
modified_pac_blob, srv_sig_ptr,
context,
service_keyblock);
if (ret) {
DEBUG(1, ("PAC Decode: Failed to verify the service "
"signature: %s\n", error_message(ret)));
return NT_STATUS_ACCESS_DENIED;
}
if (krbtgt_keyblock) {
/* verify the service key checksum by krbtgt_key */
ret = check_pac_checksum(mem_ctx,
srv_sig_ptr->signature, kdc_sig_ptr,
context, krbtgt_keyblock);
if (ret) {
DEBUG(1, ("PAC Decode: Failed to verify the KDC signature: %s\n",
smb_get_krb5_error_message(context, ret, mem_ctx)));
return NT_STATUS_ACCESS_DENIED;
}
}
/* Convert to NT time, so as not to loose accuracy in comparison */
unix_to_nt_time(&tgs_authtime_nttime, tgs_authtime);
if (tgs_authtime_nttime != logon_name->logon_time) {
DEBUG(2, ("PAC Decode: "
"Logon time mismatch between ticket and PAC!\n"));
DEBUG(2, ("PAC Decode: PAC: %s\n",
nt_time_string(mem_ctx, logon_name->logon_time)));
DEBUG(2, ("PAC Decode: Ticket: %s\n",
nt_time_string(mem_ctx, tgs_authtime_nttime)));
return NT_STATUS_ACCESS_DENIED;
}
ret = smb_krb5_parse_name_norealm(context,
logon_name->account_name,
&client_principal_pac);
if (ret) {
DEBUG(2, ("Could not parse name from PAC: [%s]:%s\n",
logon_name->account_name, error_message(ret)));
return NT_STATUS_INVALID_PARAMETER;
}
bool_ret = smb_krb5_principal_compare_any_realm(context,
client_principal,
client_principal_pac);
krb5_free_principal(context, client_principal_pac);
if (!bool_ret) {
DEBUG(2, ("Name in PAC [%s] does not match principal name "
"in ticket\n", logon_name->account_name));
return NT_STATUS_ACCESS_DENIED;
}
DEBUG(3,("Found account name from PAC: %s [%s]\n",
logon_info->info3.base.account_name.string,
logon_info->info3.base.full_name.string));
DEBUG(10,("Successfully validated Kerberos PAC\n"));
if (DEBUGLEVEL >= 10) {
const char *s;
s = NDR_PRINT_STRUCT_STRING(mem_ctx, PAC_DATA, pac_data);
if (s) {
DEBUGADD(10,("%s\n", s));
}
}
*pac_data_out = pac_data;
return NT_STATUS_OK;
}
#endif

15
libcli/auth/krb5_wrap.h
View File

@ -54,3 +54,18 @@ krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
krb5_checksum *cksum,
uint8_t *data,
size_t length);
krb5_error_code check_pac_checksum(TALLOC_CTX *mem_ctx,
DATA_BLOB pac_data,
struct PAC_SIGNATURE_DATA *sig,
krb5_context context,
const krb5_keyblock *keyblock);
NTSTATUS kerberos_decode_pac(TALLOC_CTX *mem_ctx,
DATA_BLOB pac_data_blob,
krb5_context context,
const krb5_keyblock *krbtgt_keyblock,
const krb5_keyblock *service_keyblock,
krb5_const_principal client_principal,
time_t tgs_authtime,
struct PAC_DATA **pac_data_out);

4
libcli/auth/wscript_build
View File

@ -40,5 +40,5 @@ bld.SAMBA_SUBSYSTEM('SPNEGO_PARSE',
deps='asn1util')
bld.SAMBA_SUBSYSTEM('KRB5_WRAP',
source='krb5_wrap.c',
deps='krb5')
source='krb5_wrap.c kerberos_pac.c',
deps='krb5 ndr-krb5pac')

2
source3/Makefile.in
View File

@ -511,7 +511,7 @@ LIBADS_OBJ = libads/ldap.o \
libads/disp_sec.o libads/ldap_utils.o \
libads/ldap_schema.o libads/util.o libads/ndr.o
LIBADS_SERVER_OBJ = libads/kerberos_verify.o libads/authdata.o \
LIBADS_SERVER_OBJ = libads/kerberos_verify.o libads/authdata.o ../libcli/auth/kerberos_pac.o \
../librpc/ndr/ndr_krb5pac.o \
librpc/gen_ndr/ndr_krb5pac.o

15
source3/include/krb5_protos.h
View File

@ -58,21 +58,6 @@ krb5_principal kerberos_fetch_salt_princ_for_host_princ(krb5_context context, kr
void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype);
bool kerberos_compatible_enctypes(krb5_context context, krb5_enctype enctype1, krb5_enctype enctype2);
void kerberos_free_data_contents(krb5_context context, krb5_data *pdata);
NTSTATUS decode_pac_data(TALLOC_CTX *mem_ctx,
DATA_BLOB *pac_data_blob,
krb5_context context,
krb5_keyblock *service_keyblock,
krb5_const_principal client_principal,
time_t tgs_authtime,
struct PAC_DATA **pac_data_out);
void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
struct PAC_SIGNATURE_DATA *sig);
krb5_error_code smb_krb5_verify_checksum(krb5_context context,
const krb5_keyblock *keyblock,
krb5_keyusage usage,
krb5_checksum *cksum,
uint8 *data,
size_t length);
time_t get_authtime_from_tkt(krb5_ticket *tkt);
krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
const krb5_data *inbuf,

317
source3/libads/authdata.c
View File

@ -29,323 +29,6 @@
#ifdef HAVE_KRB5
/****************************************************************
****************************************************************/
static krb5_error_code check_pac_checksum(TALLOC_CTX *mem_ctx,
DATA_BLOB pac_data,
struct PAC_SIGNATURE_DATA *sig,
krb5_context context,
krb5_keyblock *keyblock)
{
krb5_error_code ret;
krb5_checksum cksum;
krb5_keyusage usage = 0;
smb_krb5_checksum_from_pac_sig(&cksum, sig);
#ifdef HAVE_KRB5_KU_OTHER_CKSUM /* Heimdal */
usage = KRB5_KU_OTHER_CKSUM;
#elif defined(HAVE_KRB5_KEYUSAGE_APP_DATA_CKSUM) /* MIT */
usage = KRB5_KEYUSAGE_APP_DATA_CKSUM;
#else
#error UNKNOWN_KRB5_KEYUSAGE
#endif
ret = smb_krb5_verify_checksum(context,
keyblock,
usage,
&cksum,
pac_data.data,
pac_data.length);
if (ret) {
DEBUG(2,("check_pac_checksum: PAC Verification failed: %s (%d)\n",
error_message(ret), ret));
return ret;
}
return ret;
}
/**
* @brief Decode a blob containing a NDR envoded PAC structure
*
* @param mem_ctx - The memory context
* @param pac_data_blob - The data blob containing the NDR encoded data
* @param context - The Kerberos Context
* @param service_keyblock - The Service Key used to verify the checksum
* @param client_principal - The client principal
* @param tgs_authtime - The ticket timestamp
* @param pac_data_out - [out] The decoded PAC
*
* @return - A NTSTATUS error code
*/
NTSTATUS decode_pac_data(TALLOC_CTX *mem_ctx,
DATA_BLOB *pac_data_blob,
krb5_context context,
krb5_keyblock *service_keyblock,
krb5_const_principal client_principal,
time_t tgs_authtime,
struct PAC_DATA **pac_data_out)
{
NTSTATUS status;
enum ndr_err_code ndr_err;
krb5_error_code ret;
DATA_BLOB modified_pac_blob;
NTTIME tgs_authtime_nttime;
krb5_principal client_principal_pac = NULL;
int i;
struct PAC_SIGNATURE_DATA *srv_sig_ptr = NULL;
struct PAC_SIGNATURE_DATA *kdc_sig_ptr = NULL;
struct PAC_SIGNATURE_DATA *srv_sig_wipe = NULL;
struct PAC_SIGNATURE_DATA *kdc_sig_wipe = NULL;
struct PAC_LOGON_NAME *logon_name = NULL;
struct PAC_LOGON_INFO *logon_info = NULL;
struct PAC_DATA *pac_data = NULL;
struct PAC_DATA_RAW *pac_data_raw = NULL;
DATA_BLOB *srv_sig_blob = NULL;
DATA_BLOB *kdc_sig_blob = NULL;
bool bool_ret;
*pac_data_out = NULL;
pac_data = TALLOC_ZERO_P(mem_ctx, struct PAC_DATA);
pac_data_raw = TALLOC_ZERO_P(mem_ctx, struct PAC_DATA_RAW);
kdc_sig_wipe = TALLOC_ZERO_P(mem_ctx, struct PAC_SIGNATURE_DATA);
srv_sig_wipe = TALLOC_ZERO_P(mem_ctx, struct PAC_SIGNATURE_DATA);
if (!pac_data_raw || !pac_data || !kdc_sig_wipe || !srv_sig_wipe) {
return NT_STATUS_NO_MEMORY;
}
ndr_err = ndr_pull_struct_blob(pac_data_blob, pac_data, pac_data,
(ndr_pull_flags_fn_t)ndr_pull_PAC_DATA);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(0,("can't parse the PAC: %s\n",
nt_errstr(status)));
return status;
}
if (pac_data->num_buffers < 4) {
/* we need logon_ingo, service_key and kdc_key */
DEBUG(0,("less than 4 PAC buffers\n"));
return NT_STATUS_INVALID_PARAMETER;
}
ndr_err = ndr_pull_struct_blob(
pac_data_blob, pac_data_raw, pac_data_raw,
(ndr_pull_flags_fn_t)ndr_pull_PAC_DATA_RAW);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(0,("can't parse the PAC: %s\n",
nt_errstr(status)));
return status;
}
if (pac_data_raw->num_buffers < 4) {
/* we need logon_ingo, service_key and kdc_key */
DEBUG(0,("less than 4 PAC buffers\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (pac_data->num_buffers != pac_data_raw->num_buffers) {
/* we need logon_ingo, service_key and kdc_key */
DEBUG(0, ("misparse! PAC_DATA has %d buffers while "
"PAC_DATA_RAW has %d\n", pac_data->num_buffers,
pac_data_raw->num_buffers));
return NT_STATUS_INVALID_PARAMETER;
}
for (i=0; i < pac_data->num_buffers; i++) {
struct PAC_BUFFER *data_buf = &pac_data->buffers[i];
struct PAC_BUFFER_RAW *raw_buf = &pac_data_raw->buffers[i];
if (data_buf->type != raw_buf->type) {
DEBUG(0, ("misparse! PAC_DATA buffer %d has type "
"%d while PAC_DATA_RAW has %d\n", i,
data_buf->type, raw_buf->type));
return NT_STATUS_INVALID_PARAMETER;
}
switch (data_buf->type) {
case PAC_TYPE_LOGON_INFO:
if (!data_buf->info) {
break;
}
logon_info = data_buf->info->logon_info.info;
break;
case PAC_TYPE_SRV_CHECKSUM:
if (!data_buf->info) {
break;
}
srv_sig_ptr = &data_buf->info->srv_cksum;
srv_sig_blob = &raw_buf->info->remaining;
break;
case PAC_TYPE_KDC_CHECKSUM:
if (!data_buf->info) {
break;
}
kdc_sig_ptr = &data_buf->info->kdc_cksum;
kdc_sig_blob = &raw_buf->info->remaining;
break;
case PAC_TYPE_LOGON_NAME:
logon_name = &data_buf->info->logon_name;
break;
default:
break;
}
}
if (!logon_info) {
DEBUG(0,("PAC no logon_info\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (!logon_name) {
DEBUG(0,("PAC no logon_name\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (!srv_sig_ptr || !srv_sig_blob) {
DEBUG(0,("PAC no srv_key\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (!kdc_sig_ptr || !kdc_sig_blob) {
DEBUG(0,("PAC no kdc_key\n"));
return NT_STATUS_INVALID_PARAMETER;
}
/* Find and zero out the signatures,
* as required by the signing algorithm */
/* We find the data blobs above,
* now we parse them to get at the exact portion we should zero */
ndr_err = ndr_pull_struct_blob(
kdc_sig_blob, kdc_sig_wipe, kdc_sig_wipe,
(ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(0,("can't parse the KDC signature: %s\n",
nt_errstr(status)));
return status;
}
ndr_err = ndr_pull_struct_blob(
srv_sig_blob, srv_sig_wipe, srv_sig_wipe,
(ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(0,("can't parse the SRV signature: %s\n",
nt_errstr(status)));
return status;
}
/* Now zero the decoded structure */
memset(kdc_sig_wipe->signature.data,
'\0', kdc_sig_wipe->signature.length);
memset(srv_sig_wipe->signature.data,
'\0', srv_sig_wipe->signature.length);
/* and reencode, back into the same place it came from */
ndr_err = ndr_push_struct_blob(
kdc_sig_blob, pac_data_raw, kdc_sig_wipe,
(ndr_push_flags_fn_t)ndr_push_PAC_SIGNATURE_DATA);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(0,("can't repack the KDC signature: %s\n",
nt_errstr(status)));
return status;
}
ndr_err = ndr_push_struct_blob(
srv_sig_blob, pac_data_raw, srv_sig_wipe,
(ndr_push_flags_fn_t)ndr_push_PAC_SIGNATURE_DATA);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(0,("can't repack the SRV signature: %s\n",
nt_errstr(status)));
return status;
}
/* push out the whole structure, but now with zero'ed signatures */
ndr_err = ndr_push_struct_blob(
&modified_pac_blob, pac_data_raw, pac_data_raw,
(ndr_push_flags_fn_t)ndr_push_PAC_DATA_RAW);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(0,("can't repack the RAW PAC: %s\n",
nt_errstr(status)));
return status;
}
/* verify by service_key */
ret = check_pac_checksum(mem_ctx,
modified_pac_blob, srv_sig_ptr,
context,
service_keyblock);
if (ret) {
DEBUG(1, ("PAC Decode: Failed to verify the service "
"signature: %s\n", error_message(ret)));
return NT_STATUS_ACCESS_DENIED;
}
/* Convert to NT time, so as not to loose accuracy in comparison */
unix_to_nt_time(&tgs_authtime_nttime, tgs_authtime);
if (tgs_authtime_nttime != logon_name->logon_time) {
DEBUG(2, ("PAC Decode: "
"Logon time mismatch between ticket and PAC!\n"));
DEBUG(2, ("PAC Decode: PAC: %s\n",
nt_time_string(mem_ctx, logon_name->logon_time)));
DEBUG(2, ("PAC Decode: Ticket: %s\n",
nt_time_string(mem_ctx, tgs_authtime_nttime)));
return NT_STATUS_ACCESS_DENIED;
}
ret = smb_krb5_parse_name_norealm(context,
logon_name->account_name,
&client_principal_pac);
if (ret) {
DEBUG(2, ("Could not parse name from PAC: [%s]:%s\n",
logon_name->account_name, error_message(ret)));
return NT_STATUS_INVALID_PARAMETER;
}
bool_ret = smb_krb5_principal_compare_any_realm(context,
client_principal,
client_principal_pac);
krb5_free_principal(context, client_principal_pac);
if (!bool_ret) {
DEBUG(2, ("Name in PAC [%s] does not match principal name "
"in ticket\n", logon_name->account_name));
return NT_STATUS_ACCESS_DENIED;
}
DEBUG(3,("Found account name from PAC: %s [%s]\n",
logon_info->info3.base.account_name.string,
logon_info->info3.base.full_name.string));
DEBUG(10,("Successfully validated Kerberos PAC\n"));
if (DEBUGLEVEL >= 10) {
const char *s;
s = NDR_PRINT_STRUCT_STRING(mem_ctx, PAC_DATA, pac_data);
if (s) {
DEBUGADD(10,("%s\n", s));
}
}
*pac_data_out = pac_data;
return NT_STATUS_OK;
}
/****************************************************************
Given a username, password and other details, return the
PAC_LOGON_INFO (the structure containing the important user

6
source3/libads/kerberos_verify.c
View File

@ -680,9 +680,9 @@ NTSTATUS ads_verify_ticket(TALLOC_CTX *mem_ctx,
if (got_auth_data) {
struct PAC_DATA *pac_data;
pac_ret = decode_pac_data(mem_ctx, &auth_data, context,
keyblock, client_principal,
authtime, &pac_data);
pac_ret = kerberos_decode_pac(mem_ctx, auth_data, context,
NULL, keyblock, client_principal,
authtime, &pac_data);
data_blob_free(&auth_data);
if (!NT_STATUS_IS_OK(pac_ret)) {
DEBUG(3, (__location__ ": failed to decode "

2
source3/wscript_build
View File

@ -833,7 +833,7 @@ bld.SAMBA3_LIBRARY('ads',
bld.SAMBA3_SUBSYSTEM('LIBADS_SERVER',
source=LIBADS_SERVER_SRC,
deps='ndr-krb5pac krb5',
deps='ndr-krb5pac krb5 KRB5_WRAP',
vars=locals())
bld.SAMBA3_SUBSYSTEM('LIBADS_PRINTER',

4
source4/auth/gensec/gensec_krb5.c
View File

@ -697,11 +697,11 @@ static NTSTATUS gensec_krb5_session_info(struct gensec_security *gensec_security
/* decode and verify the pac */
nt_status = kerberos_pac_logon_info(gensec_krb5_state,
&logon_info, pac,
pac,
gensec_krb5_state->smb_krb5_context->krb5_context,
NULL, gensec_krb5_state->keyblock,
client_principal,
gensec_krb5_state->ticket->ticket.authtime, NULL);
gensec_krb5_state->ticket->ticket.authtime, &logon_info);
if (!NT_STATUS_IS_OK(nt_status)) {
free(principal_string);

27
source4/auth/kerberos/kerberos.h
View File

@ -25,6 +25,7 @@
#include "auth/kerberos/krb5_init_context.h"
#include "librpc/gen_ndr/krb5pac.h"
#include "libcli/auth/krb5_wrap.h"
struct auth_user_info_dc;
struct cli_credentials;
@ -112,24 +113,14 @@ bool kerberos_compatible_enctypes(krb5_context context, krb5_enctype enctype1, k
void kerberos_free_data_contents(krb5_context context, krb5_data *pdata);
krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry);
char *smb_get_krb5_error_message(krb5_context context, krb5_error_code code, TALLOC_CTX *mem_ctx);
NTSTATUS kerberos_decode_pac(TALLOC_CTX *mem_ctx,
struct PAC_DATA **pac_data_out,
DATA_BLOB blob,
krb5_context context,
const krb5_keyblock *krbtgt_keyblock,
const krb5_keyblock *service_keyblock,
krb5_const_principal client_principal,
time_t tgs_authtime,
krb5_error_code *k5ret);
NTSTATUS kerberos_pac_logon_info(TALLOC_CTX *mem_ctx,
struct PAC_LOGON_INFO **logon_info,
DATA_BLOB blob,
krb5_context context,
const krb5_keyblock *krbtgt_keyblock,
const krb5_keyblock *service_keyblock,
krb5_const_principal client_principal,
time_t tgs_authtime,
krb5_error_code *k5ret);
NTSTATUS kerberos_pac_logon_info(TALLOC_CTX *mem_ctx,
DATA_BLOB blob,
krb5_context context,
const krb5_keyblock *krbtgt_keyblock,
const krb5_keyblock *service_keyblock,
krb5_const_principal client_principal,
time_t tgs_authtime,
struct PAC_LOGON_INFO **logon_info);
krb5_error_code kerberos_encode_pac(TALLOC_CTX *mem_ctx,
struct PAC_DATA *pac_data,
krb5_context context,

324
source4/auth/kerberos/kerberos_pac.c
View File

@ -31,334 +31,26 @@
#include <ldb.h>
#include "auth/auth_sam_reply.h"
krb5_error_code check_pac_checksum(TALLOC_CTX *mem_ctx,
DATA_BLOB pac_data,
struct PAC_SIGNATURE_DATA *sig,
krb5_context context,
const krb5_keyblock *keyblock)
{
krb5_error_code ret;
krb5_crypto crypto;
Checksum cksum;
cksum.cksumtype = (CKSUMTYPE)sig->type;
cksum.checksum.length = sig->signature.length;
cksum.checksum.data = sig->signature.data;
ret = krb5_crypto_init(context,
keyblock,
0,
&crypto);
if (ret) {
DEBUG(0,("krb5_crypto_init() failed: %s\n",
smb_get_krb5_error_message(context, ret, mem_ctx)));
return ret;
}
ret = krb5_verify_checksum(context,
crypto,
KRB5_KU_OTHER_CKSUM,
pac_data.data,
pac_data.length,
&cksum);
krb5_crypto_destroy(context, crypto);
return ret;
}
NTSTATUS kerberos_decode_pac(TALLOC_CTX *mem_ctx,
struct PAC_DATA **pac_data_out,
DATA_BLOB blob,
krb5_context context,
const krb5_keyblock *krbtgt_keyblock,
const krb5_keyblock *service_keyblock,
krb5_const_principal client_principal,
time_t tgs_authtime,
krb5_error_code *k5ret)
{
krb5_error_code ret;
NTSTATUS status;
enum ndr_err_code ndr_err;
struct PAC_SIGNATURE_DATA *srv_sig_ptr = NULL;
struct PAC_SIGNATURE_DATA *kdc_sig_ptr = NULL;
struct PAC_SIGNATURE_DATA *srv_sig_wipe = NULL;
struct PAC_SIGNATURE_DATA *kdc_sig_wipe = NULL;
struct PAC_LOGON_INFO *logon_info = NULL;
struct PAC_LOGON_NAME *logon_name = NULL;
struct PAC_DATA *pac_data;
struct PAC_DATA_RAW *pac_data_raw;
DATA_BLOB *srv_sig_blob = NULL;
DATA_BLOB *kdc_sig_blob = NULL;
DATA_BLOB modified_pac_blob;
NTTIME tgs_authtime_nttime;
krb5_principal client_principal_pac;
uint32_t i;
krb5_clear_error_message(context);
if (k5ret) {
*k5ret = KRB5_PARSE_MALFORMED;
}
pac_data = talloc(mem_ctx, struct PAC_DATA);
pac_data_raw = talloc(mem_ctx, struct PAC_DATA_RAW);
kdc_sig_wipe = talloc(mem_ctx, struct PAC_SIGNATURE_DATA);
srv_sig_wipe = talloc(mem_ctx, struct PAC_SIGNATURE_DATA);
if (!pac_data_raw || !pac_data || !kdc_sig_wipe || !srv_sig_wipe) {
if (k5ret) {
*k5ret = ENOMEM;
}
return NT_STATUS_NO_MEMORY;
}
ndr_err = ndr_pull_struct_blob(&blob, pac_data,
pac_data, (ndr_pull_flags_fn_t)ndr_pull_PAC_DATA);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(0,("can't parse the PAC: %s\n",
nt_errstr(status)));
return status;
}
if (pac_data->num_buffers < 4) {
/* we need logon_ingo, service_key and kdc_key */
DEBUG(0,("less than 4 PAC buffers\n"));
return NT_STATUS_INVALID_PARAMETER;
}
ndr_err = ndr_pull_struct_blob(&blob, pac_data_raw,
pac_data_raw,
(ndr_pull_flags_fn_t)ndr_pull_PAC_DATA_RAW);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(0,("can't parse the PAC: %s\n",
nt_errstr(status)));
return status;
}
if (pac_data_raw->num_buffers < 4) {
/* we need logon_ingo, service_key and kdc_key */
DEBUG(0,("less than 4 PAC buffers\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (pac_data->num_buffers != pac_data_raw->num_buffers) {
/* we need logon_ingo, service_key and kdc_key */
DEBUG(0,("misparse! PAC_DATA has %d buffers while PAC_DATA_RAW has %d\n",
pac_data->num_buffers, pac_data_raw->num_buffers));
return NT_STATUS_INVALID_PARAMETER;
}
for (i=0; i < pac_data->num_buffers; i++) {
if (pac_data->buffers[i].type != pac_data_raw->buffers[i].type) {
DEBUG(0,("misparse! PAC_DATA buffer %d has type %d while PAC_DATA_RAW has %d\n",
i, pac_data->buffers[i].type, pac_data->buffers[i].type));
return NT_STATUS_INVALID_PARAMETER;
}
switch (pac_data->buffers[i].type) {
case PAC_TYPE_LOGON_INFO:
if (!pac_data->buffers[i].info) {
break;
}
logon_info = pac_data->buffers[i].info->logon_info.info;
break;
case PAC_TYPE_SRV_CHECKSUM:
if (!pac_data->buffers[i].info) {
break;
}
srv_sig_ptr = &pac_data->buffers[i].info->srv_cksum;
srv_sig_blob = &pac_data_raw->buffers[i].info->remaining;
break;
case PAC_TYPE_KDC_CHECKSUM:
if (!pac_data->buffers[i].info) {
break;
}
kdc_sig_ptr = &pac_data->buffers[i].info->kdc_cksum;
kdc_sig_blob = &pac_data_raw->buffers[i].info->remaining;
break;
case PAC_TYPE_LOGON_NAME:
logon_name = &pac_data->buffers[i].info->logon_name;
break;
default:
break;
}
}
if (!logon_info) {
DEBUG(0,("PAC no logon_info\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (!logon_name) {
DEBUG(0,("PAC no logon_name\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (!srv_sig_ptr || !srv_sig_blob) {
DEBUG(0,("PAC no srv_key\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (!kdc_sig_ptr || !kdc_sig_blob) {
DEBUG(0,("PAC no kdc_key\n"));
return NT_STATUS_INVALID_PARAMETER;
}
/* Find and zero out the signatures, as required by the signing algorithm */
/* We find the data blobs above, now we parse them to get at the exact portion we should zero */
ndr_err = ndr_pull_struct_blob(kdc_sig_blob, kdc_sig_wipe,
kdc_sig_wipe,
(ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(0,("can't parse the KDC signature: %s\n",
nt_errstr(status)));
return status;
}
ndr_err = ndr_pull_struct_blob(srv_sig_blob, srv_sig_wipe,
srv_sig_wipe,
(ndr_pull_flags_fn_t)ndr_pull_PAC_SIGNATURE_DATA);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(0,("can't parse the SRV signature: %s\n",
nt_errstr(status)));
return status;
}
/* Now zero the decoded structure */
memset(kdc_sig_wipe->signature.data, '\0', kdc_sig_wipe->signature.length);
memset(srv_sig_wipe->signature.data, '\0', srv_sig_wipe->signature.length);
/* and reencode, back into the same place it came from */
ndr_err = ndr_push_struct_blob(kdc_sig_blob, pac_data_raw,
kdc_sig_wipe,
(ndr_push_flags_fn_t)ndr_push_PAC_SIGNATURE_DATA);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(0,("can't repack the KDC signature: %s\n",
nt_errstr(status)));
return status;
}
ndr_err = ndr_push_struct_blob(srv_sig_blob, pac_data_raw,
srv_sig_wipe,
(ndr_push_flags_fn_t)ndr_push_PAC_SIGNATURE_DATA);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(0,("can't repack the SRV signature: %s\n",
nt_errstr(status)));
return status;
}
/* push out the whole structure, but now with zero'ed signatures */
ndr_err = ndr_push_struct_blob(&modified_pac_blob, pac_data_raw,
pac_data_raw,
(ndr_push_flags_fn_t)ndr_push_PAC_DATA_RAW);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(0,("can't repack the RAW PAC: %s\n",
nt_errstr(status)));
return status;
}
/* verify by service_key */
ret = check_pac_checksum(mem_ctx,
modified_pac_blob, srv_sig_ptr,
context,
service_keyblock);
if (ret) {
DEBUG(1, ("PAC Decode: Failed to verify the service signature: %s\n",
smb_get_krb5_error_message(context, ret, mem_ctx)));
if (k5ret) {
*k5ret = ret;
}
return NT_STATUS_ACCESS_DENIED;
}
if (krbtgt_keyblock) {
ret = check_pac_checksum(mem_ctx,
srv_sig_ptr->signature, kdc_sig_ptr,
context, krbtgt_keyblock);
if (ret) {
DEBUG(1, ("PAC Decode: Failed to verify the KDC signature: %s\n",
smb_get_krb5_error_message(context, ret, mem_ctx)));
if (k5ret) {
*k5ret = ret;
}
return NT_STATUS_ACCESS_DENIED;
}
}
/* Convert to NT time, so as not to loose accuracy in comparison */
unix_to_nt_time(&tgs_authtime_nttime, tgs_authtime);
if (tgs_authtime_nttime != logon_name->logon_time) {
DEBUG(2, ("PAC Decode: Logon time mismatch between ticket and PAC!\n"));
DEBUG(2, ("PAC Decode: PAC: %s\n", nt_time_string(mem_ctx, logon_name->logon_time)));
DEBUG(2, ("PAC Decode: Ticket: %s\n", nt_time_string(mem_ctx, tgs_authtime_nttime)));
return NT_STATUS_ACCESS_DENIED;
}
ret = krb5_parse_name_flags(context, logon_name->account_name, KRB5_PRINCIPAL_PARSE_NO_REALM,
&client_principal_pac);
if (ret) {
DEBUG(2, ("Could not parse name from incoming PAC: [%s]: %s\n",
logon_name->account_name,
smb_get_krb5_error_message(context, ret, mem_ctx)));
if (k5ret) {
*k5ret = ret;
}
return NT_STATUS_INVALID_PARAMETER;
}
if (!krb5_principal_compare_any_realm(context, client_principal, client_principal_pac)) {
DEBUG(2, ("Name in PAC [%s] does not match principal name in ticket\n",
logon_name->account_name));
krb5_free_principal(context, client_principal_pac);
return NT_STATUS_ACCESS_DENIED;
}
krb5_free_principal(context, client_principal_pac);
#if 0
if (strcasecmp(logon_info->info3.base.account_name.string,
"Administrator")== 0) {
file_save("tmp_pac_data-admin.dat",blob.data,blob.length);
}
#endif
DEBUG(3,("Found account name from PAC: %s [%s]\n",
logon_info->info3.base.account_name.string,
logon_info->info3.base.full_name.string));
*pac_data_out = pac_data;
return NT_STATUS_OK;
}
_PUBLIC_ NTSTATUS kerberos_pac_logon_info(TALLOC_CTX *mem_ctx,
struct PAC_LOGON_INFO **logon_info,
DATA_BLOB blob,
krb5_context context,
const krb5_keyblock *krbtgt_keyblock,
const krb5_keyblock *service_keyblock,
krb5_const_principal client_principal,
time_t tgs_authtime,
krb5_error_code *k5ret)
DATA_BLOB blob,
krb5_context context,
const krb5_keyblock *krbtgt_keyblock,
const krb5_keyblock *service_keyblock,
krb5_const_principal client_principal,
time_t tgs_authtime,
struct PAC_LOGON_INFO **logon_info)
{
NTSTATUS nt_status;
struct PAC_DATA *pac_data;
int i;
nt_status = kerberos_decode_pac(mem_ctx,
&pac_data,
blob,
context,
krbtgt_keyblock,
service_keyblock,
client_principal,
tgs_authtime,
k5ret);
&pac_data);
if (!NT_STATUS_IS_OK(nt_status)) {
return nt_status;
}

23
source4/torture/auth/pac.c
View File

@ -142,13 +142,13 @@ static bool torture_pac_self_check(struct torture_context *tctx)
/* Now check that we can read it back (using full decode and validate) */
nt_status = kerberos_decode_pac(mem_ctx,
&pac_data,
tmp_blob,
smb_krb5_context->krb5_context,
&krbtgt_keyblock,
&server_keyblock,
client_principal,
logon_time, NULL);
logon_time,
&pac_data);
if (!NT_STATUS_IS_OK(nt_status)) {
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
@ -189,14 +189,13 @@ static bool torture_pac_self_check(struct torture_context *tctx)
/* Now check that we can read it back (yet again) */
nt_status = kerberos_pac_logon_info(mem_ctx,
&logon_info,
tmp_blob,
smb_krb5_context->krb5_context,
&krbtgt_keyblock,
&server_keyblock,
client_principal,
logon_time,
NULL);
&logon_info);
if (!NT_STATUS_IS_OK(nt_status)) {
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
@ -408,12 +407,11 @@ static bool torture_pac_saved_check(struct torture_context *tctx)
/* Decode and verify the signaure on the PAC */
nt_status = kerberos_decode_pac(mem_ctx,
&pac_data,
tmp_blob,
smb_krb5_context->krb5_context,
krbtgt_keyblock_p,
&server_keyblock,
client_principal, authtime, NULL);
client_principal, authtime, &pac_data);
if (!NT_STATUS_IS_OK(nt_status)) {
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
krbtgt_keyblock_p);
@ -466,12 +464,11 @@ static bool torture_pac_saved_check(struct torture_context *tctx)
/* Parse the PAC again, for the logon info this time (using Samba4's parsing) */
nt_status = kerberos_pac_logon_info(mem_ctx,
&logon_info,
tmp_blob,
smb_krb5_context->krb5_context,
krbtgt_keyblock_p,
&server_keyblock,
client_principal, authtime, NULL);
client_principal, authtime, &logon_info);
if (!NT_STATUS_IS_OK(nt_status)) {
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
@ -654,13 +651,12 @@ static bool torture_pac_saved_check(struct torture_context *tctx)
/* Break the auth time, to ensure we check this vital detail (not setting this caused all the pain in the first place... */
nt_status = kerberos_decode_pac(mem_ctx,
&pac_data,
tmp_blob,
smb_krb5_context->krb5_context,
krbtgt_keyblock_p,
&server_keyblock,
client_principal,
authtime + 1, NULL);
authtime + 1, &pac_data);
if (NT_STATUS_IS_OK(nt_status)) {
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
@ -691,13 +687,12 @@ static bool torture_pac_saved_check(struct torture_context *tctx)
}
nt_status = kerberos_decode_pac(mem_ctx,
&pac_data,
tmp_blob,
smb_krb5_context->krb5_context,
krbtgt_keyblock_p,
&server_keyblock,
client_principal,
authtime, NULL);
authtime, &pac_data);
if (NT_STATUS_IS_OK(nt_status)) {
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
krbtgt_keyblock_p);
@ -710,13 +705,13 @@ static bool torture_pac_saved_check(struct torture_context *tctx)
tmp_blob.data[tmp_blob.length - 2]++;
nt_status = kerberos_decode_pac(mem_ctx,
&pac_data,
tmp_blob,
smb_krb5_context->krb5_context,
krbtgt_keyblock_p,
&server_keyblock,
client_principal,
authtime, NULL);
authtime,
&pac_data);
if (NT_STATUS_IS_OK(nt_status)) {
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
krbtgt_keyblock_p);