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diff --git a/source3/lib/util_builtin.c b/source3/lib/util_builtin.c
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+/*
+ Unix SMB/CIFS implementation.
+ Translate BUILTIN names to SIDs and vice versa
+ Copyright (C) Volker Lendecke 2005
+
+ 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 "../libcli/security/security.h"
+
+struct rid_name_map {
+ uint32_t rid;
+ const char *name;
+};
+
+static const struct rid_name_map builtin_aliases[] = {
+ { BUILTIN_RID_ADMINISTRATORS, "Administrators" },
+ { BUILTIN_RID_USERS, "Users" },
+ { BUILTIN_RID_GUESTS, "Guests" },
+ { BUILTIN_RID_POWER_USERS, "Power Users" },
+ { BUILTIN_RID_ACCOUNT_OPERATORS, "Account Operators" },
+ { BUILTIN_RID_SERVER_OPERATORS, "Server Operators" },
+ { BUILTIN_RID_PRINT_OPERATORS, "Print Operators" },
+ { BUILTIN_RID_BACKUP_OPERATORS, "Backup Operators" },
+ { BUILTIN_RID_REPLICATOR, "Replicator" },
+ { BUILTIN_RID_RAS_SERVERS, "RAS Servers" },
+ { BUILTIN_RID_PRE_2K_ACCESS,
+ "Pre-Windows 2000 Compatible Access" },
+ { BUILTIN_RID_REMOTE_DESKTOP_USERS,
+ "Remote Desktop Users" },
+ { BUILTIN_RID_NETWORK_CONF_OPERATORS,
+ "Network Configuration Operators" },
+ { BUILTIN_RID_INCOMING_FOREST_TRUST,
+ "Incoming Forest Trust Builders" },
+ { BUILTIN_RID_PERFMON_USERS,
+ "Performance Monitor Users" },
+ { BUILTIN_RID_PERFLOG_USERS,
+ "Performance Log Users" },
+ { BUILTIN_RID_AUTH_ACCESS,
+ "Windows Authorization Access Group" },
+ { BUILTIN_RID_TS_LICENSE_SERVERS,
+ "Terminal Server License Servers" },
+ { BUILTIN_RID_DISTRIBUTED_COM_USERS,
+ "Distributed COM Users" },
+ { BUILTIN_RID_CRYPTO_OPERATORS,
+ "Cryptographic Operators" },
+ { BUILTIN_RID_EVENT_LOG_READERS,
+ "Event Log Readers" },
+ { BUILTIN_RID_CERT_SERV_DCOM_ACCESS,
+ "Certificate Service DCOM Access" },
+ { 0, NULL}};
+
+/*******************************************************************
+ Look up a rid in the BUILTIN domain
+ ********************************************************************/
+bool lookup_builtin_rid(TALLOC_CTX *mem_ctx, uint32_t rid, const char **name)
+{
+ const struct rid_name_map *aliases = builtin_aliases;
+
+ while (aliases->name != NULL) {
+ if (rid == aliases->rid) {
+ *name = talloc_strdup(mem_ctx, aliases->name);
+ return True;
+ }
+ aliases++;
+ }
+
+ return False;
+}
+
+/*******************************************************************
+ Look up a name in the BUILTIN domain
+ ********************************************************************/
+bool lookup_builtin_name(const char *name, uint32_t *rid)
+{
+ const struct rid_name_map *aliases = builtin_aliases;
+
+ while (aliases->name != NULL) {
+ if (strequal(name, aliases->name)) {
+ *rid = aliases->rid;
+ return True;
+ }
+ aliases++;
+ }
+
+ return False;
+}
+
+/*****************************************************************
+ Return the name of the BUILTIN domain
+*****************************************************************/
+
+const char *builtin_domain_name(void)
+{
+ return "BUILTIN";
+}
+
+/*****************************************************************
+ Check if the SID is the builtin SID (S-1-5-32).
+*****************************************************************/
+
+bool sid_check_is_builtin(const struct dom_sid *sid)
+{
+ return dom_sid_equal(sid, &global_sid_Builtin);
+}
+
+/*****************************************************************
+ Check if the SID is one of the builtin SIDs (S-1-5-32-a).
+*****************************************************************/
+
+bool sid_check_is_in_builtin(const struct dom_sid *sid)
+{
+ struct dom_sid dom_sid;
+
+ sid_copy(&dom_sid, sid);
+ sid_split_rid(&dom_sid, NULL);
+
+ return sid_check_is_builtin(&dom_sid);
+}
+
+/********************************************************************
+ Check if the SID is one of the well-known builtin SIDs (S-1-5-32-x)
+*********************************************************************/
+
+bool sid_check_is_wellknown_builtin(const struct dom_sid *sid)
+{
+ struct dom_sid dom_sid;
+ const struct rid_name_map *aliases = builtin_aliases;
+ uint32_t rid;
+
+ sid_copy(&dom_sid, sid);
+ sid_split_rid(&dom_sid, &rid);
+
+ if (!sid_check_is_builtin(&dom_sid)) {
+ return false;
+ }
+
+ while (aliases->name != NULL) {
+ if (aliases->rid == rid) {
+ return True;
+ }
+ aliases++;
+ }
+
+ return False;
+}