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/*
Unix SMB/CIFS implementation.
net ads setspn routines
Copyright (C) Noel Power 2018
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 "ads.h"
#ifdef HAVE_ADS
bool ads_setspn_list(ADS_STRUCT *ads, const char *machine_name)
{
size_t i = 0;
TALLOC_CTX *frame = NULL;
char **spn_array = NULL;
size_t num_spns = 0;
bool ok = false;
ADS_STATUS status;
frame = talloc_stackframe();
status = ads_get_service_principal_names(frame,
ads,
machine_name,
&spn_array,
&num_spns);
if (!ADS_ERR_OK(status)) {
goto done;
}
d_printf("Registered SPNs for %s\n", machine_name);
for (i = 0; i < num_spns; i++) {
d_printf("\t%s\n", spn_array[i]);
}
ok = true;
done:
TALLOC_FREE(frame);
return ok;
}
/* returns true if spn exists in spn_array (match is NOT case-sensitive) */
static bool find_spn_in_spnlist(TALLOC_CTX *ctx,
const char *spn,
char **spn_array,
size_t num_spns)
{
char *lc_spn = NULL;
size_t i = 0;
lc_spn = strlower_talloc(ctx, spn);
if (lc_spn == NULL) {
DBG_ERR("Out of memory, lowercasing %s.\n",
spn);
return false;
}
for (i = 0; i < num_spns; i++) {
char *lc_spn_attr = strlower_talloc(ctx, spn_array[i]);
if (lc_spn_attr == NULL) {
DBG_ERR("Out of memory, lowercasing %s.\n",
spn_array[i]);
return false;
}
if (strequal(lc_spn, lc_spn_attr)) {
return true;
}
}
return false;
}
bool ads_setspn_add(ADS_STRUCT *ads, const char *machine_name, const char * spn)
{
bool ret = false;
TALLOC_CTX *frame = NULL;
ADS_STATUS status;
struct spn_struct *spn_struct = NULL;
const char *spns[2] = {NULL, NULL};
char **existing_spns = NULL;
size_t num_spns = 0;
bool found = false;
frame = talloc_stackframe();
spns[0] = spn;
spn_struct = parse_spn(frame, spn);
if (spn_struct == NULL) {
goto done;
}
status = ads_get_service_principal_names(frame,
ads,
machine_name,
&existing_spns,
&num_spns);
if (!ADS_ERR_OK(status)) {
goto done;
}
found = find_spn_in_spnlist(frame, spn, existing_spns, num_spns);
if (found) {
d_printf("Duplicate SPN found, aborting operation.\n");
goto done;
}
d_printf("Registering SPN %s for object %s\n", spn, machine_name);
status = ads_add_service_principal_names(ads, machine_name, spns);
if (!ADS_ERR_OK(status)) {
goto done;
}
ret = true;
d_printf("Updated object\n");
done:
TALLOC_FREE(frame);
return ret;
}
bool ads_setspn_delete(ADS_STRUCT *ads,
const char *machine_name,
const char * spn)
{
size_t i = 0, j = 0;
TALLOC_CTX *frame = NULL;
char **spn_array = NULL;
const char **new_spn_array = NULL;
char *lc_spn = NULL;
size_t num_spns = 0;
ADS_STATUS status;
ADS_MODLIST mods;
bool ok = false;
LDAPMessage *res = NULL;
frame = talloc_stackframe();
lc_spn = strlower_talloc(frame, spn);
if (lc_spn == NULL) {
DBG_ERR("Out of memory, lowercasing %s.\n", spn);
goto done;
}
status = ads_find_machine_acct(ads,
&res,
machine_name);
if (!ADS_ERR_OK(status)) {
goto done;
}
status = ads_get_service_principal_names(frame,
ads,
machine_name,
&spn_array,
&num_spns);
if (!ADS_ERR_OK(status)) {
goto done;
}
new_spn_array = talloc_zero_array(frame, const char*, num_spns + 1);
if (!new_spn_array) {
DBG_ERR("Out of memory, failed to allocate array.\n");
goto done;
}
/*
* create new spn list to write to object (excluding the spn to
* be deleted).
*/
for (i = 0, j = 0; i < num_spns; i++) {
/*
* windows setspn.exe deletes matching spn in a case
* insensitive way.
*/
char *lc_spn_attr = strlower_talloc(frame, spn_array[i]);
if (lc_spn_attr == NULL) {
DBG_ERR("Out of memory, lowercasing %s.\n",
spn_array[i]);
goto done;
}
if (!strequal(lc_spn, lc_spn_attr)) {
new_spn_array[j++] = spn_array[i];
}
}
/* found and removed spn */
if (j < num_spns) {
char *dn = NULL;
mods = ads_init_mods(frame);
if (mods == NULL) {
goto done;
}
d_printf("Unregistering SPN %s for %s\n", spn, machine_name);
status = ads_mod_strlist(frame, &mods, "servicePrincipalName", new_spn_array);
if (!ADS_ERR_OK(status)) {
goto done;
}
dn = ads_get_dn(ads, frame, res);
if (dn == NULL ) {
goto done;
}
status = ads_gen_mod(ads, dn, mods);
if (!ADS_ERR_OK(status)) {
goto done;
}
}
d_printf("Updated object\n");
ok = true;
done:
TALLOC_FREE(frame);
return ok;
}
#endif /* HAVE_ADS */
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