sysdb_idmap.c revision 3a59cbd0b7b9c5dd3c62ac1679876070c264d80f
/*
SSSD
Authors:
Stephen Gallagher <sgallagh@redhat.com>
Copyright (C) 2012 Red Hat
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 "db/sysdb.h"
#include "db/sysdb_private.h"
struct ldb_dn *
sysdb_idmap_dn(TALLOC_CTX *mem_ctx, struct sysdb_ctx *sysdb,
const char *object_sid)
{
errno_t ret;
char *clean_sid;
struct ldb_dn *dn;
ret = sysdb_dn_sanitize(NULL, object_sid, &clean_sid);
if (ret != EOK) {
return NULL;
}
DEBUG(SSSDBG_TRACE_ALL,
(SYSDB_TMPL_IDMAP"\n", clean_sid, sysdb->domain->name));
dn = ldb_dn_new_fmt(mem_ctx, sysdb->ldb, SYSDB_TMPL_IDMAP,
clean_sid, sysdb->domain->name);
talloc_free(clean_sid);
return dn;
}
errno_t
sysdb_idmap_store_mapping(struct sysdb_ctx *sysdb,
const char *dom_name,
const char *dom_sid,
id_t slice_num)
{
errno_t ret, sret;
int lret;
bool in_transaction = false;
TALLOC_CTX *tmp_ctx;
struct ldb_dn *dn;
static const char *attrs[] = SYSDB_IDMAP_ATTRS;
size_t count;
struct ldb_message *update_msg;
struct ldb_message **msgs;
const char *old_name;
id_t old_slice;
tmp_ctx = talloc_new(NULL);
if (!tmp_ctx) return ENOMEM;
dn = sysdb_idmap_dn(tmp_ctx, sysdb, dom_sid);
if (!dn) {
ret = ENOMEM;
goto done;
}
update_msg = ldb_msg_new(tmp_ctx);
if (!update_msg) {
ret = ENOMEM;
goto done;
}
update_msg->dn = dn;
ret = sysdb_transaction_start(sysdb);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, ("Failed to start transaction\n"));
goto done;
}
in_transaction = true;
/* Check for an existing mapping */
ret = sysdb_search_entry(tmp_ctx, sysdb, dn, LDB_SCOPE_BASE,
NULL, attrs, &count, &msgs);
if (ret != EOK && ret != ENOENT) goto done;
if (ret == EOK && count != 1) {
/* More than one reply for a base search? */
ret = EIO;
goto done;
} else if (ret == ENOENT) {
/* Create a new mapping */
DEBUG(SSSDBG_CONF_SETTINGS,
("Adding new ID mapping [%s][%s][%lu]\n",
dom_name, dom_sid, (unsigned long)slice_num));
/* Add the objectClass */
lret = ldb_msg_add_empty(update_msg, SYSDB_OBJECTCLASS,
LDB_FLAG_MOD_ADD,
NULL);
if (lret != LDB_SUCCESS) {
ret = sysdb_error_to_errno(lret);
goto done;
}
lret = ldb_msg_add_string(update_msg, SYSDB_OBJECTCLASS,
SYSDB_IDMAP_MAPPING_OC);
if (lret != LDB_SUCCESS) {
ret = sysdb_error_to_errno(lret);
goto done;
}
/* Add the domain objectSID */
lret = ldb_msg_add_empty(update_msg, SYSDB_IDMAP_SID_ATTR,
LDB_FLAG_MOD_ADD,
NULL);
if (lret != LDB_SUCCESS) {
ret = sysdb_error_to_errno(lret);
goto done;
}
lret = ldb_msg_add_string(update_msg, SYSDB_IDMAP_SID_ATTR, dom_sid);
if (lret != LDB_SUCCESS) {
ret = sysdb_error_to_errno(lret);
goto done;
}
/* Add the domain name */
lret = ldb_msg_add_empty(update_msg, SYSDB_NAME,
LDB_FLAG_MOD_ADD,
NULL);
if (lret != LDB_SUCCESS) {
ret = sysdb_error_to_errno(lret);
goto done;
}
lret = ldb_msg_add_string(update_msg, SYSDB_NAME, dom_name);
if (lret != LDB_SUCCESS) {
ret = sysdb_error_to_errno(lret);
goto done;
}
/* Add the slice number */
lret = ldb_msg_add_empty(update_msg, SYSDB_IDMAP_SLICE_ATTR,
LDB_FLAG_MOD_ADD,
NULL);
if (lret != LDB_SUCCESS) {
ret = sysdb_error_to_errno(lret);
goto done;
}
lret = ldb_msg_add_fmt(update_msg, SYSDB_IDMAP_SLICE_ATTR,
"%lu", (unsigned long)slice_num);
if (lret != LDB_SUCCESS) {
ret = sysdb_error_to_errno(lret);
goto done;
}
lret = ldb_add(sysdb->ldb, update_msg);
if (lret != LDB_SUCCESS) {
DEBUG(SSSDBG_MINOR_FAILURE,
("Failed to add mapping: [%s]\n",
ldb_strerror(lret)));
ret = sysdb_error_to_errno(lret);
goto done;
}
} else {
/* Update the existing mapping */
/* Check whether the slice has changed
* This should never happen, and it's a recipe for
* disaster. We'll throw an error if it does.
*/
old_slice = ldb_msg_find_attr_as_int(msgs[0],
SYSDB_IDMAP_SLICE_ATTR,
-1);
if (old_slice == -1) {
DEBUG(SSSDBG_CRIT_FAILURE,
("Could not identify original slice for SID [%s]\n",
dom_sid));
ret = ENOENT;
goto done;
}
if (slice_num != old_slice) {
DEBUG(SSSDBG_FATAL_FAILURE,
("Detected attempt to change slice value for sid [%s] "
"This will break existing users. Refusing to perform.\n"));
ret = EINVAL;
goto done;
}
/* Check whether the name has changed. This may happen
* if we're told the real name of a domain and want to
* replace the SID as placeholder.
*/
old_name = ldb_msg_find_attr_as_string(msgs[0], SYSDB_NAME, NULL);
if (!old_name) {
DEBUG(SSSDBG_CRIT_FAILURE,
("Could not identify original domain name of SID [%s]\n",
dom_sid));
ret = ENOENT;
goto done;
}
if (strcmp(old_name, dom_name) == 0) {
/* There's nothing to be done. We don't need to
* make any changes here. Just return success.
*/
DEBUG(SSSDBG_TRACE_LIBS,
("No changes needed, canceling transaction\n"));
ret = EOK;
goto done;
} else {
/* The name has changed. Replace it */
DEBUG(SSSDBG_CONF_SETTINGS,
("Changing domain name of SID [%s] from [%s] to [%s]\n",
dom_sid, old_name, dom_name));
/* Set the new name */
lret = ldb_msg_add_empty(update_msg, SYSDB_NAME,
LDB_FLAG_MOD_REPLACE,
NULL);
if (lret != LDB_SUCCESS) {
ret = sysdb_error_to_errno(lret);
goto done;
}
lret = ldb_msg_add_string(update_msg, SYSDB_NAME, dom_name);
if (lret != LDB_SUCCESS) {
ret = sysdb_error_to_errno(lret);
goto done;
}
}
lret = ldb_modify(sysdb->ldb, update_msg);
if (lret != LDB_SUCCESS) {
DEBUG(SSSDBG_MINOR_FAILURE,
("Failed to update mapping: [%s]\n",
ldb_strerror(lret)));
ret = sysdb_error_to_errno(lret);
goto done;
}
}
ret = sysdb_transaction_commit(sysdb);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE,
("Could not commit transaction: [%s]\n", strerror(ret)));
goto done;
}
in_transaction = false;
done:
if (in_transaction) {
sret = sysdb_transaction_cancel(sysdb);
if (sret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE,
("Could not cancel transaction\n"));
}
}
talloc_free(tmp_ctx);
return ret;
}
errno_t
sysdb_idmap_get_mappings(TALLOC_CTX *mem_ctx,
struct sysdb_ctx *sysdb,
struct ldb_result **_result)
{
errno_t ret;
int lret;
struct ldb_dn *base_dn;
TALLOC_CTX *tmp_ctx;
struct ldb_result *res;
static const char *attrs[] = SYSDB_IDMAP_ATTRS;
tmp_ctx = talloc_new(NULL);
if (!tmp_ctx) return ENOMEM;
DEBUG(SSSDBG_TRACE_ALL,
(SYSDB_TMPL_IDMAP_BASE"\n", sysdb->domain->name));
base_dn = ldb_dn_new_fmt(tmp_ctx, sysdb->ldb,
SYSDB_TMPL_IDMAP_BASE,
sysdb->domain->name);
if (!base_dn) {
ret = ENOMEM;
goto done;
}
lret = ldb_search(sysdb->ldb, tmp_ctx, &res, base_dn,
LDB_SCOPE_SUBTREE, attrs, SYSDB_IDMAP_FILTER);
if (lret) {
DEBUG(SSSDBG_MINOR_FAILURE,
("Could not locate ID mappings: [%s]\n",
ldb_strerror(lret)));
ret = sysdb_error_to_errno(lret);
goto done;
}
*_result = talloc_steal(mem_ctx, res);
ret = EOK;
done:
talloc_free(tmp_ctx);
return ret;
}