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samba-mirror/source4/libnet/libnet_export_keytab.c
Pavel Filipenský 471163e512 libnet: Fix debug text
Signed-off-by: Pavel Filipenský <pfilipensky@samba.org>
Reviewed-by: Reviewed-by: Martin Schwenke <martin@meltin.net>
2024-07-17 07:48:31 +00:00

467 lines
12 KiB
C

/*
Unix SMB/CIFS implementation.
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2009
Copyright (C) Andreas Schneider <asn@samba.org> 2016
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 "system/kerberos.h"
#include "auth/credentials/credentials.h"
#include "auth/kerberos/kerberos.h"
#include "auth/kerberos/kerberos_credentials.h"
#include "auth/kerberos/kerberos_util.h"
#include "auth/kerberos/kerberos_srv_keytab.h"
#include "kdc/samba_kdc.h"
#include "libnet/libnet_export_keytab.h"
#include "kdc/db-glue.h"
#include "kdc/sdb.h"
#include "dsdb/gmsa/util.h"
static NTSTATUS sdb_kt_copy(TALLOC_CTX *mem_ctx,
struct smb_krb5_context *smb_krb5_context,
struct samba_kdc_db_context *db_ctx,
const char *keytab_name,
const char *principal,
bool keep_stale_entries,
bool include_historic_keys,
const unsigned sdb_flags,
const char **error_string)
{
struct sdb_entry sentry = {};
krb5_keytab keytab;
krb5_error_code code = 0;
NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
char *entry_principal = NULL;
bool copy_one_principal = (principal != NULL);
bool keys_exported = false;
krb5_context context = smb_krb5_context->krb5_context;
TALLOC_CTX *tmp_ctx = NULL;
code = smb_krb5_kt_open_relative(context,
keytab_name,
true, /* write_access */
&keytab);
if (code != 0) {
*error_string = talloc_asprintf(mem_ctx,
"Failed to open keytab: %s",
keytab_name);
status = NT_STATUS_NO_SUCH_FILE;
goto done;
}
if (copy_one_principal) {
krb5_principal k5_princ;
code = smb_krb5_parse_name(context, principal, &k5_princ);
if (code != 0) {
*error_string = smb_get_krb5_error_message(context,
code,
mem_ctx);
status = NT_STATUS_UNSUCCESSFUL;
goto done;
}
code = samba_kdc_fetch(context, db_ctx, k5_princ,
SDB_F_GET_ANY | sdb_flags,
0, &sentry);
krb5_free_principal(context, k5_princ);
} else {
code = samba_kdc_firstkey(context, db_ctx, sdb_flags, &sentry);
}
for (; code == 0; code = samba_kdc_nextkey(context, db_ctx, sdb_flags, &sentry)) {
int i;
bool found_previous = false;
tmp_ctx = talloc_new(mem_ctx);
if (tmp_ctx == NULL) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
code = krb5_unparse_name(context,
sentry.principal,
&entry_principal);
if (code != 0) {
*error_string = smb_get_krb5_error_message(context,
code,
mem_ctx);
status = NT_STATUS_UNSUCCESSFUL;
goto done;
}
if (!keep_stale_entries) {
code = smb_krb5_remove_obsolete_keytab_entries(mem_ctx,
context,
keytab,
1, &sentry.principal,
sentry.kvno,
&found_previous,
error_string);
if (code != 0) {
*error_string = talloc_asprintf(mem_ctx,
"Failed to remove old principals from keytab: %s\n",
*error_string);
status = NT_STATUS_UNSUCCESSFUL;
goto done;
}
}
/*
* If this was a gMSA and we did not just read the
* keys directly, then generate them
*/
if (sentry.skdc_entry->group_managed_service_account
&& sentry.keys.len == 0) {
struct ldb_dn *dn = sentry.skdc_entry->msg->dn;
/*
* for error message only, but we are about to
* destroy the string name, so write this out
* now
*/
const char *extended_dn =
ldb_dn_get_extended_linearized(mem_ctx,
dn,
1);
/*
* Modify the DN in the entry (not needed by
* the KDC code any longer) to be minimal, so
* we can search on it over LDAP.
*/
ldb_dn_minimise(dn);
status = smb_krb5_fill_keytab_gmsa_keys(tmp_ctx,
smb_krb5_context,
keytab,
sentry.principal,
db_ctx->samdb,
dn,
include_historic_keys,
error_string);
if (NT_STATUS_IS_OK(status)) {
keys_exported = true;
} else if (copy_one_principal) {
*error_string = talloc_asprintf(mem_ctx,
"Failed to write gMSA password for %s to keytab: %s\n",
principal,
*error_string);
goto done;
} else if (!NT_STATUS_EQUAL(status, NT_STATUS_NO_USER_KEYS)) {
*error_string = talloc_asprintf(mem_ctx,
"Failed to write gMSA password for %s to keytab: %s\n",
extended_dn,
*error_string);
goto done;
}
} else {
krb5_keytab_entry kt_entry;
ZERO_STRUCT(kt_entry);
kt_entry.principal = sentry.principal;
kt_entry.vno = sentry.kvno;
for (i = 0; i < sentry.keys.len; i++) {
struct sdb_key *s = &(sentry.keys.val[i]);
krb5_keyblock *keyp;
bool found;
keyp = KRB5_KT_KEY(&kt_entry);
*keyp = s->key;
code = smb_krb5_is_exact_entry_in_keytab(mem_ctx,
context,
keytab,
&kt_entry,
&found,
error_string);
if (code != 0) {
status = NT_STATUS_UNSUCCESSFUL;
*error_string = smb_get_krb5_error_message(context,
code,
mem_ctx);
DEBUG(0, ("smb_krb5_is_exact_entry_in_keytab failed code=%d, error = %s\n",
code, *error_string));
goto done;
}
if (found) {
continue;
}
code = krb5_kt_add_entry(context, keytab, &kt_entry);
if (code != 0) {
status = NT_STATUS_UNSUCCESSFUL;
*error_string = smb_get_krb5_error_message(context,
code,
mem_ctx);
DBG_ERR("krb5_kt_add_entry failed "
"code=%d, error = %s\n",
code, *error_string);
goto done;
}
keys_exported = true;
}
kt_entry.vno -= 1;
for (i = 0; include_historic_keys && i < sentry.old_keys.len; i++) {
struct sdb_key *s = &(sentry.old_keys.val[i]);
krb5_keyblock *keyp;
bool found;
keyp = KRB5_KT_KEY(&kt_entry);
*keyp = s->key;
code = smb_krb5_is_exact_entry_in_keytab(mem_ctx,
context,
keytab,
&kt_entry,
&found,
error_string);
if (code != 0) {
status = NT_STATUS_UNSUCCESSFUL;
*error_string = smb_get_krb5_error_message(context,
code,
mem_ctx);
DEBUG(0, ("smb_krb5_is_exact_entry_in_keytab failed code=%d, error = %s\n",
code, *error_string));
goto done;
}
if (found) {
continue;
}
code = krb5_kt_add_entry(context, keytab, &kt_entry);
if (code != 0) {
status = NT_STATUS_UNSUCCESSFUL;
*error_string = smb_get_krb5_error_message(context,
code,
mem_ctx);
DEBUG(0, ("smb_krb5_kt_add_entry failed code=%d, error = %s\n",
code, *error_string));
goto done;
}
keys_exported = true;
}
kt_entry.vno -= 1;
for (i = 0; include_historic_keys && i < sentry.older_keys.len; i++) {
struct sdb_key *s = &(sentry.older_keys.val[i]);
krb5_keyblock *keyp;
bool found;
keyp = KRB5_KT_KEY(&kt_entry);
*keyp = s->key;
code = smb_krb5_is_exact_entry_in_keytab(mem_ctx,
context,
keytab,
&kt_entry,
&found,
error_string);
if (code != 0) {
status = NT_STATUS_UNSUCCESSFUL;
*error_string = smb_get_krb5_error_message(context,
code,
mem_ctx);
DEBUG(0, ("smb_krb5_is_exact_entry_in_keytab failed code=%d, error = %s\n",
code, *error_string));
goto done;
}
if (found) {
continue;
}
code = krb5_kt_add_entry(context, keytab, &kt_entry);
if (code != 0) {
status = NT_STATUS_UNSUCCESSFUL;
*error_string = smb_get_krb5_error_message(context,
code,
mem_ctx);
DEBUG(0, ("smb_krb5_kt_add_entry failed code=%d, error = %s\n",
code, *error_string));
goto done;
}
keys_exported = true;
}
}
if (copy_one_principal) {
break;
}
TALLOC_FREE(tmp_ctx);
SAFE_FREE(entry_principal);
sdb_entry_free(&sentry);
}
if (code != 0 && code != SDB_ERR_NOENTRY) {
*error_string = smb_get_krb5_error_message(context,
code,
mem_ctx);
status = NT_STATUS_NO_SUCH_USER;
goto done;
}
if (keys_exported == false) {
if (keep_stale_entries == false) {
*error_string = talloc_asprintf(mem_ctx,
"No keys found while exporting %s. "
"Consider connecting to a local sam.ldb, "
"only gMSA accounts can be exported over "
"LDAP and connecting user needs to be authorized",
principal ? principal : "all users in domain");
status = NT_STATUS_NO_USER_KEYS;
} else {
DBG_NOTICE("No new keys found while exporting %s. "
"If new keys were expected, consider connecting "
"to a local sam.ldb, only gMSA accounts can be exported over "
"LDAP and connecting user needs to be authorized\n",
principal ? principal : "all users in domain");
status = NT_STATUS_OK;
}
} else {
status = NT_STATUS_OK;
}
done:
TALLOC_FREE(tmp_ctx);
SAFE_FREE(entry_principal);
sdb_entry_free(&sentry);
return status;
}
NTSTATUS libnet_export_keytab(struct libnet_context *ctx, TALLOC_CTX *mem_ctx, struct libnet_export_keytab *r)
{
krb5_error_code ret;
struct smb_krb5_context *smb_krb5_context;
struct samba_kdc_base_context *base_ctx;
struct samba_kdc_db_context *db_ctx = NULL;
const char *error_string = NULL;
unsigned sdb_flags;
NTSTATUS status;
bool keep_stale_entries = r->in.keep_stale_entries;
ret = smb_krb5_init_context(ctx, ctx->lp_ctx, &smb_krb5_context);
if (ret) {
return NT_STATUS_NO_MEMORY;
}
base_ctx = talloc_zero(mem_ctx, struct samba_kdc_base_context);
if (base_ctx == NULL) {
return NT_STATUS_NO_MEMORY;
}
base_ctx->ev_ctx = ctx->event_ctx;
base_ctx->lp_ctx = ctx->lp_ctx;
base_ctx->samdb = r->in.samdb;
if (base_ctx->samdb != NULL) {
base_ctx->current_nttime_ull = talloc_get_type(
ldb_get_opaque(base_ctx->samdb, DSDB_GMSA_TIME_OPAQUE), unsigned long long);
}
/*
* If the caller hasn't set a fixed time, or a samdb, set up
* the pointer for the opaque and set to the current time
*/
if (base_ctx->current_nttime_ull == NULL) {
bool time_ok;
NTTIME current_nttime;
base_ctx->current_nttime_ull = talloc_zero(base_ctx, unsigned long long);
if (base_ctx->current_nttime_ull == NULL) {
r->out.error_string = NULL;
return NT_STATUS_NO_MEMORY;
}
time_ok = gmsa_current_time(&current_nttime);
if (!time_ok) {
/* This is really quite unlikely */
r->out.error_string
= talloc_asprintf(mem_ctx,
"Failed to get current time to check "
"time-dependent keys against for export");
return NT_STATUS_UNSUCCESSFUL;
}
*base_ctx->current_nttime_ull = current_nttime;
}
status = samba_kdc_setup_db_ctx(mem_ctx, base_ctx, &db_ctx);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
if (r->in.principal != NULL) {
DEBUG(0, ("Export one principal to %s\n", r->in.keytab_name));
} else {
DEBUG(0, ("Export complete keytab to %s\n", r->in.keytab_name));
if (!keep_stale_entries) {
struct stat st;
int stat_ret = stat(r->in.keytab_name, &st);
if (stat_ret == -1 && errno == ENOENT) {
/* continue */
} else if (stat_ret == -1) {
int errno_save = errno;
r->out.error_string
= talloc_asprintf(mem_ctx,
"Failure checking if keytab export location %s is an existing file: %s",
r->in.keytab_name,
strerror(errno_save));
return map_nt_error_from_unix_common(errno_save);
} else {
r->out.error_string
= talloc_asprintf(mem_ctx,
"Refusing to export keytab to existing file %s",
r->in.keytab_name);
return NT_STATUS_OBJECT_NAME_EXISTS;
}
/*
* No point looking for old
* keys in a empty file
*/
keep_stale_entries = true;
}
}
sdb_flags = r->in.as_for_AS_REQ ? SDB_F_FOR_AS_REQ : SDB_F_ADMIN_DATA;
status = sdb_kt_copy(mem_ctx,
smb_krb5_context,
db_ctx,
r->in.keytab_name,
r->in.principal,
keep_stale_entries,
!r->in.only_current_keys,
sdb_flags,
&error_string);
talloc_free(db_ctx);
talloc_free(base_ctx);
if (!NT_STATUS_IS_OK(status)) {
r->out.error_string = error_string;
}
return status;
}