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/*
samba3sid module
Copyright (C) Andrew Bartlett 2010
Copyright (C) Andrew Tridgell 2010
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/>.
*/
/*
add objectSid to users and groups using samba3 nextRid method
*/
#include "includes.h"
#include "libcli/ldap/ldap_ndr.h"
#include "ldb_module.h"
#include "dsdb/samdb/samdb.h"
#include "dsdb/samdb/ldb_modules/util.h"
#include "libcli/security/security.h"
#include "librpc/gen_ndr/ndr_security.h"
#include "ldb_wrap.h"
#include "param/param.h"
/*
RID algorithm from pdb_ldap.c in source3/passdb/
(loosely based on Volkers code)
*/
static int samba3sid_next_sid(struct ldb_module *module,
TALLOC_CTX *mem_ctx, char **sid)
{
TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
struct ldb_result *res;
const char *attrs[] = { "sambaNextRid", "sambaNextUserRid",
"sambaNextGroupRid", "sambaSID", NULL };
int ret;
struct ldb_context *ldb = ldb_module_get_ctx(module);
struct ldb_message *msg;
uint32_t sambaNextRid, sambaNextGroupRid, sambaNextUserRid, rid;
const char *sambaSID;
ret = dsdb_module_search(module, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE,
attrs,
DSDB_FLAG_NEXT_MODULE |
DSDB_SEARCH_SEARCH_ALL_PARTITIONS,
"(&(objectClass=sambaDomain)(sambaDomainName=%s))",
lpcfg_sam_name(ldb_get_opaque(ldb, "loadparm")));
if (ret != LDB_SUCCESS) {
ldb_asprintf_errstring(ldb,
__location__
": Failed to find domain object - %s",
ldb_errstring(ldb));
talloc_free(tmp_ctx);
return ret;
}
if (res->count != 1) {
ldb_asprintf_errstring(ldb,
__location__
": Expected exactly 1 domain object - got %u",
res->count);
talloc_free(tmp_ctx);
return LDB_ERR_OPERATIONS_ERROR;
}
msg = res->msgs[0];
sambaNextRid = ldb_msg_find_attr_as_uint(msg, "sambaNextRid",
(uint32_t) -1);
sambaNextUserRid = ldb_msg_find_attr_as_uint(msg, "sambaNextUserRid",
(uint32_t) -1);
sambaNextGroupRid = ldb_msg_find_attr_as_uint(msg, "sambaNextGroupRid",
(uint32_t) -1);
sambaSID = ldb_msg_find_attr_as_string(msg, "sambaSID", NULL);
if (sambaSID == NULL) {
ldb_asprintf_errstring(ldb,
__location__
": No sambaSID in %s",
ldb_dn_get_linearized(msg->dn));
talloc_free(tmp_ctx);
return LDB_ERR_OPERATIONS_ERROR;
}
/* choose the highest of the 3 - see pdb_ldap.c for an
* explaination */
rid = sambaNextRid;
if ((sambaNextUserRid != (uint32_t) -1) && (sambaNextUserRid > rid)) {
rid = sambaNextUserRid;
}
if ((sambaNextGroupRid != (uint32_t) -1) && (sambaNextGroupRid > rid)) {
rid = sambaNextGroupRid;
}
if (rid == (uint32_t) -1) {
ldb_asprintf_errstring(ldb,
__location__
": No sambaNextRid in %s",
ldb_dn_get_linearized(msg->dn));
talloc_free(tmp_ctx);
return LDB_ERR_OPERATIONS_ERROR;
}
/* sambaNextRid is actually the previous RID .... */
rid += 1;
(*sid) = talloc_asprintf(tmp_ctx, "%s-%u", sambaSID, rid);
if (!*sid) {
talloc_free(tmp_ctx);
return ldb_module_oom(module);
}
ret = dsdb_module_constrainted_update_uint32(module, msg->dn,
"sambaNextRid",
&sambaNextRid, &rid);
if (ret != LDB_SUCCESS) {
ldb_asprintf_errstring(ldb,
__location__
": Failed to update sambaNextRid - %s",
ldb_errstring(ldb));
talloc_free(tmp_ctx);
return ret;
}
talloc_steal(mem_ctx, *sid);
talloc_free(tmp_ctx);
return LDB_SUCCESS;
}
/* add */
static int samba3sid_add(struct ldb_module *module, struct ldb_request *req)
{
struct ldb_context *ldb;
int ret;
const struct ldb_message *msg = req->op.add.message;
struct ldb_message *new_msg;
char *sid;
struct ldb_request *new_req;
ldb = ldb_module_get_ctx(module);
/* do not manipulate our control entries */
if (ldb_dn_is_special(req->op.add.message->dn)) {
return ldb_next_request(module, req);
}
if (!samdb_find_attribute(ldb, msg, "objectclass", "posixAccount") &&
!samdb_find_attribute(ldb, msg, "objectclass", "posixGroup")) {
/* its not a user or a group */
return ldb_next_request(module, req);
}
if (ldb_msg_find_element(msg, "sambaSID")) {
/* a SID was supplied */
return ldb_next_request(module, req);
}
new_msg = ldb_msg_copy_shallow(req, req->op.add.message);
if (!new_msg) {
return ldb_module_oom(module);
}
ret = samba3sid_next_sid(module, new_msg, &sid);
if (ret != LDB_SUCCESS) {
return ret;
}
ret = ldb_msg_add_steal_string(new_msg, "sambaSID", sid);
if (ret != LDB_SUCCESS) {
return ret;
}
ret = ldb_build_add_req(&new_req, ldb, req,
new_msg,
req->controls,
req, dsdb_next_callback,
req);
LDB_REQ_SET_LOCATION(new_req);
if (ret != LDB_SUCCESS) {
return ret;
}
return ldb_next_request(module, new_req);
}
static const struct ldb_module_ops ldb_samba3sid_module_ops = {
.name = "samba3sid",
.add = samba3sid_add,
};
int ldb_samba3sid_module_init(const char *version)
{
LDB_MODULE_CHECK_VERSION(version);
return ldb_register_module(&ldb_samba3sid_module_ops);
}
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