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/*
Unix SMB/CIFS implementation.
mapping routines for SID <-> unix uid/gid
Copyright (C) Andrew Tridgell 2004
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
/*
private context for sid mapping routines
*/
struct sidmap_context {
void *samctx;
};
/*
open a sidmap context - use talloc_free to close
*/
struct sidmap_context *sidmap_open(TALLOC_CTX *mem_ctx)
{
struct sidmap_context *sidmap;
sidmap = talloc_p(mem_ctx, struct sidmap_context);
if (sidmap == NULL) {
return NULL;
}
sidmap->samctx = samdb_connect(sidmap);
if (sidmap->samctx == NULL) {
talloc_free(sidmap);
return NULL;
}
return sidmap;
}
/*
map a sid to a unix uid
*/
NTSTATUS sidmap_sid_to_unixuid(struct sidmap_context *sidmap,
struct dom_sid *sid, uid_t *uid)
{
const char *attrs[] = { "sAMAccountName", "unixID",
"unixName", "sAMAccountType", NULL };
int ret;
const char *s;
void *ctx;
struct ldb_message **res;
const char *sidstr;
uint_t atype;
ctx = talloc(sidmap, 0);
sidstr = dom_sid_string(ctx, sid);
if (sidstr == NULL) {
talloc_free(ctx);
return NT_STATUS_NO_MEMORY;
}
ret = samdb_search(sidmap->samctx, ctx, NULL, &res, attrs,
"objectSid=%s", sidstr);
if (ret != 1) {
DEBUG(0,("sid_to_unixuid: unable to find sam record for sid %s\n", sidstr));
talloc_free(ctx);
return NT_STATUS_ACCESS_DENIED;
}
/* make sure its a user, not a group */
atype = samdb_result_uint(res[0], "sAMAccountType", 0);
if (atype && (!(atype & ATYPE_ACCOUNT))) {
DEBUG(0,("sid_to_unixuid: sid %s is not an account!\n", sidstr));
talloc_free(ctx);
return NT_STATUS_ACCESS_DENIED;
}
/* first try to get the uid directly */
s = samdb_result_string(res[0], "unixID", NULL);
if (s != NULL) {
*uid = strtoul(s, NULL, 0);
talloc_free(ctx);
return NT_STATUS_OK;
}
/* next try via the UnixName attribute */
s = samdb_result_string(res[0], "unixName", NULL);
if (s != NULL) {
struct passwd *pwd = getpwnam(s);
if (!pwd) {
DEBUG(0,("unixName %s for sid %s does not exist as a local user\n", s, sidstr));
talloc_free(ctx);
return NT_STATUS_ACCESS_DENIED;
}
*uid = pwd->pw_uid;
talloc_free(ctx);
return NT_STATUS_OK;
}
/* finally try via the sAMAccountName attribute */
s = samdb_result_string(res[0], "sAMAccountName", NULL);
if (s != NULL) {
struct passwd *pwd = getpwnam(s);
if (!pwd) {
DEBUG(0,("sAMAccountName '%s' for sid %s does not exist as a local user\n", s, sidstr));
talloc_free(ctx);
return NT_STATUS_ACCESS_DENIED;
}
*uid = pwd->pw_uid;
talloc_free(ctx);
return NT_STATUS_OK;
}
DEBUG(0,("sid_to_unixuid: no unixID, unixName or sAMAccountName for sid %s\n", sidstr));
talloc_free(ctx);
return NT_STATUS_ACCESS_DENIED;
}
/*
map a sid to a unix gid
*/
NTSTATUS sidmap_sid_to_unixgid(struct sidmap_context *sidmap,
struct dom_sid *sid, gid_t *gid)
{
const char *attrs[] = { "sAMAccountName", "unixID",
"unixName", "sAMAccountType", NULL };
int ret;
const char *s;
void *ctx;
struct ldb_message **res;
const char *sidstr;
uint_t atype;
ctx = talloc(sidmap, 0);
sidstr = dom_sid_string(ctx, sid);
if (sidstr == NULL) {
talloc_free(ctx);
return NT_STATUS_NO_MEMORY;
}
ret = samdb_search(sidmap->samctx, ctx, NULL, &res, attrs,
"objectSid=%s", sidstr);
if (ret != 1) {
DEBUG(0,("sid_to_unixgid: unable to find sam record for sid %s\n", sidstr));
talloc_free(ctx);
return NT_STATUS_ACCESS_DENIED;
}
/* make sure its not a user */
atype = samdb_result_uint(res[0], "sAMAccountType", 0);
if (atype && atype == ATYPE_NORMAL_ACCOUNT) {
DEBUG(0,("sid_to_unixgid: sid %s is a ATYPE_NORMAL_ACCOUNT\n", sidstr));
talloc_free(ctx);
return NT_STATUS_ACCESS_DENIED;
}
/* first try to get the gid directly */
s = samdb_result_string(res[0], "unixID", NULL);
if (s != NULL) {
*gid = strtoul(s, NULL, 0);
talloc_free(ctx);
return NT_STATUS_OK;
}
/* next try via the UnixName attribute */
s = samdb_result_string(res[0], "unixName", NULL);
if (s != NULL) {
struct group *grp = getgrnam(s);
if (!grp) {
DEBUG(0,("unixName '%s' for sid %s does not exist as a local group\n",
s, sidstr));
talloc_free(ctx);
return NT_STATUS_ACCESS_DENIED;
}
*gid = grp->gr_gid;
talloc_free(ctx);
return NT_STATUS_OK;
}
/* finally try via the sAMAccountName attribute */
s = samdb_result_string(res[0], "sAMAccountName", NULL);
if (s != NULL) {
struct group *grp = getgrnam(s);
if (!grp) {
DEBUG(0,("sAMAccountName '%s' for sid %s does not exist as a local group\n", s, sidstr));
talloc_free(ctx);
return NT_STATUS_ACCESS_DENIED;
}
*gid = grp->gr_gid;
talloc_free(ctx);
return NT_STATUS_OK;
}
DEBUG(0,("sid_to_unixgid: no unixID, unixName or sAMAccountName for sid %s\n",
sidstr));
talloc_free(ctx);
return NT_STATUS_ACCESS_DENIED;
}
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