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/*
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/kerberos/kerberos.h"
#include "kdc/samba_kdc.h"
#include "libnet/libnet_export_keytab.h"
#include "kdc/db-glue.h"
#include "kdc/sdb.h"
static NTSTATUS sdb_kt_copy(TALLOC_CTX *mem_ctx,
krb5_context context,
struct samba_kdc_db_context *db_ctx,
const char *keytab_name,
const char *principal,
const char **error_string)
{
struct sdb_entry_ex sentry = {
.free_entry = NULL,
};
krb5_keytab keytab;
krb5_error_code code = 0;
NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
char *entry_principal = NULL;
bool copy_one_principal = (principal != NULL);
krb5_data password;
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, 0, &sentry);
krb5_free_principal(context, k5_princ);
} else {
code = samba_kdc_firstkey(context, db_ctx, &sentry);
}
for (; code == 0; code = samba_kdc_nextkey(context, db_ctx, &sentry)) {
int i;
code = krb5_unparse_name(context,
sentry.entry.principal,
&entry_principal);
if (code != 0) {
*error_string = smb_get_krb5_error_message(context,
code,
mem_ctx);
status = NT_STATUS_UNSUCCESSFUL;
goto done;
}
if (sentry.entry.keys.len == 0) {
SAFE_FREE(entry_principal);
sdb_free_entry(&sentry);
sentry = (struct sdb_entry_ex) {
.free_entry = NULL,
};
continue;
}
for (i = 0; i < sentry.entry.keys.len; i++) {
struct sdb_key *s = &(sentry.entry.keys.val[i]);
krb5_enctype enctype;
enctype = KRB5_KEY_TYPE(&(s->key));
password.length = KRB5_KEY_LENGTH(&s->key);
password.data = (char *)KRB5_KEY_DATA(&s->key);
DBG_INFO("smb_krb5_kt_add_entry for enctype=0x%04x\n",
(int)enctype);
code = smb_krb5_kt_add_entry(context,
keytab,
sentry.entry.kvno,
entry_principal,
NULL,
enctype,
&password,
true, /* no_salt */
false); /* keeyp_old_entries */
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;
}
}
if (copy_one_principal) {
break;
}
SAFE_FREE(entry_principal);
sdb_free_entry(&sentry);
sentry = (struct sdb_entry_ex) {
.free_entry = NULL,
};
}
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;
}
status = NT_STATUS_OK;
done:
SAFE_FREE(entry_principal);
sdb_free_entry(&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;
NTSTATUS status;
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;
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));
status = sdb_kt_copy(mem_ctx,
smb_krb5_context->krb5_context,
db_ctx,
r->in.keytab_name,
r->in.principal,
&error_string);
} else {
unlink(r->in.keytab_name);
DEBUG(0, ("Export complete keytab to %s\n", r->in.keytab_name));
status = sdb_kt_copy(mem_ctx,
smb_krb5_context->krb5_context,
db_ctx,
r->in.keytab_name,
NULL,
&error_string);
}
talloc_free(db_ctx);
talloc_free(base_ctx);
if (!NT_STATUS_IS_OK(status)) {
r->out.error_string = error_string;
}
return status;
}
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