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* Unix SMB/CIFS implementation.
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* Authentication utility functions
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* Copyright (C) Andrew Tridgell 1992-1998
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* Copyright (C) Andrew Bartlett 2001
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* Copyright (C) Jeremy Allison 2000-2001
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* Copyright (C) Rafal Szczesniak 2002
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* Copyright (C) Volker Lendecke 2006
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* Copyright (C) Michael Adam 2007
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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/* functions moved from auth/auth_util.c to minimize linker deps */
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/****************************************************************************
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Check for a SID in an NT_USER_TOKEN
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****************************************************************************/
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bool nt_token_check_sid ( const DOM_SID *sid, const NT_USER_TOKEN *token )
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for ( i=0; i<token->num_sids; i++ ) {
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if ( sid_equal( sid, &token->user_sids[i] ) )
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bool nt_token_check_domain_rid( NT_USER_TOKEN *token, uint32 rid )
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/* if we are a domain member, the get the domain SID, else for
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a DC or standalone server, use our own SID */
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if ( lp_server_role() == ROLE_DOMAIN_MEMBER ) {
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if ( !secrets_fetch_domain_sid( lp_workgroup(),
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DEBUG(1,("nt_token_check_domain_rid: Cannot lookup "
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"SID for domain [%s]\n", lp_workgroup()));
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sid_copy( &domain_sid, get_global_sam_sid() );
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sid_append_rid( &domain_sid, rid );
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return nt_token_check_sid( &domain_sid, token );\
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/******************************************************************************
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Create a token for the root user to be used internally by smbd.
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This is similar to running under the context of the LOCAL_SYSTEM account
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in Windows. This is a read-only token. Do not modify it or free() it.
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Create a copy if your need to change it.
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******************************************************************************/
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NT_USER_TOKEN *get_root_nt_token( void )
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struct nt_user_token *token, *for_cache;
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cache_data = memcache_lookup_talloc(
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NULL, SINGLETON_CACHE_TALLOC,
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data_blob_string_const_null("root_nt_token"));
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if (cache_data != NULL) {
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return talloc_get_type_abort(
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cache_data, struct nt_user_token);
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if ( !(pw = sys_getpwnam( "root" )) ) {
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DEBUG(0,("get_root_nt_token: getpwnam(\"root\") failed!\n"));
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/* get the user and primary group SIDs; although the
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BUILTIN\Administrators SId is really the one that matters here */
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uid_to_sid(&u_sid, pw->pw_uid);
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gid_to_sid(&g_sid, pw->pw_gid);
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token = create_local_nt_token(talloc_autofree_context(), &u_sid, False,
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1, &global_sid_Builtin_Administrators);
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token->privileges = se_disk_operators;
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NULL, SINGLETON_CACHE_TALLOC,
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data_blob_string_const_null("root_nt_token"), &for_cache);
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* Add alias SIDs from memberships within the partially created token SID list
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NTSTATUS add_aliases(const DOM_SID *domain_sid,
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struct nt_user_token *token)
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size_t i, num_aliases;
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if (!(tmp_ctx = talloc_init("add_aliases"))) {
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return NT_STATUS_NO_MEMORY;
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status = pdb_enum_alias_memberships(tmp_ctx, domain_sid,
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&aliases, &num_aliases);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(10, ("pdb_enum_alias_memberships failed: %s\n",
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for (i=0; i<num_aliases; i++) {
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sid_compose(&alias_sid, domain_sid, aliases[i]);
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status = add_sid_to_array_unique(token, &alias_sid,
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(0, ("add_sid_to_array failed\n"));
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TALLOC_FREE(tmp_ctx);
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/*******************************************************************
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*******************************************************************/
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static NTSTATUS add_builtin_administrators(struct nt_user_token *token,
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const DOM_SID *dom_sid)
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/* nothing to do if we aren't in a domain */
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if ( !(IS_DC || lp_server_role()==ROLE_DOMAIN_MEMBER) ) {
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/* Find the Domain Admins SID */
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sid_copy( &domadm, get_global_sam_sid() );
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sid_copy(&domadm, dom_sid);
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sid_append_rid( &domadm, DOMAIN_GROUP_RID_ADMINS );
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/* Add Administrators if the user beloongs to Domain Admins */
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if ( nt_token_check_sid( &domadm, token ) ) {
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status = add_sid_to_array(token,
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&global_sid_Builtin_Administrators,
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&token->user_sids, &token->num_sids);
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if (!NT_STATUS_IS_OK(status)) {
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* Create the requested BUILTIN if it doesn't already exist. This requires
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* winbindd to be running.
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* @param[in] rid BUILTIN rid to create
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* @return Normal NTSTATUS return.
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static NTSTATUS create_builtin(uint32 rid)
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NTSTATUS status = NT_STATUS_OK;
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if (!sid_compose(&sid, &global_sid_Builtin, rid)) {
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return NT_STATUS_NO_SUCH_ALIAS;
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if (!sid_to_gid(&sid, &gid)) {
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if (!lp_winbind_nested_groups() || !winbind_ping()) {
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return NT_STATUS_PROTOCOL_UNREACHABLE;
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status = pdb_create_builtin_alias(rid);
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* Add sid as a member of builtin_sid.
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* @param[in] builtin_sid An existing builtin group.
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* @param[in] dom_sid sid to add as a member of builtin_sid.
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* @return Normal NTSTATUS return
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static NTSTATUS add_sid_to_builtin(const DOM_SID *builtin_sid,
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const DOM_SID *dom_sid)
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NTSTATUS status = NT_STATUS_OK;
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if (!dom_sid || !builtin_sid) {
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return NT_STATUS_INVALID_PARAMETER;
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status = pdb_add_aliasmem(builtin_sid, dom_sid);
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if (NT_STATUS_EQUAL(status, NT_STATUS_MEMBER_IN_ALIAS)) {
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DEBUG(5, ("add_sid_to_builtin %s is already a member of %s\n",
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sid_string_dbg(dom_sid),
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sid_string_dbg(builtin_sid)));
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(4, ("add_sid_to_builtin %s could not be added to %s: "
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"%s\n", sid_string_dbg(dom_sid),
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sid_string_dbg(builtin_sid), nt_errstr(status)));
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/*******************************************************************
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*******************************************************************/
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NTSTATUS create_builtin_users(const DOM_SID *dom_sid)
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status = create_builtin(BUILTIN_ALIAS_RID_USERS);
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if ( !NT_STATUS_IS_OK(status) ) {
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DEBUG(5,("create_builtin_users: Failed to create Users\n"));
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/* add domain users */
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if ((IS_DC || (lp_server_role() == ROLE_DOMAIN_MEMBER))
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&& sid_compose(&dom_users, dom_sid, DOMAIN_GROUP_RID_USERS))
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status = add_sid_to_builtin(&global_sid_Builtin_Users,
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/*******************************************************************
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*******************************************************************/
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NTSTATUS create_builtin_administrators(const DOM_SID *dom_sid)
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DOM_SID dom_admins, root_sid;
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enum lsa_SidType type;
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status = create_builtin(BUILTIN_ALIAS_RID_ADMINS);
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if ( !NT_STATUS_IS_OK(status) ) {
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DEBUG(5,("create_builtin_administrators: Failed to create Administrators\n"));
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/* add domain admins */
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if ((IS_DC || (lp_server_role() == ROLE_DOMAIN_MEMBER))
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&& sid_compose(&dom_admins, dom_sid, DOMAIN_GROUP_RID_ADMINS))
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status = add_sid_to_builtin(&global_sid_Builtin_Administrators,
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if (!NT_STATUS_IS_OK(status)) {
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if ( (ctx = talloc_init("create_builtin_administrators")) == NULL ) {
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return NT_STATUS_NO_MEMORY;
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fstr_sprintf( root_name, "%s\\root", get_global_sam_name() );
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ret = lookup_name(ctx, root_name, LOOKUP_NAME_DOMAIN, NULL, NULL,
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status = add_sid_to_builtin(&global_sid_Builtin_Administrators,
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/*******************************************************************
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Create a NT token for the user, expanding local aliases
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*******************************************************************/
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struct nt_user_token *create_local_nt_token(TALLOC_CTX *mem_ctx,
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const DOM_SID *user_sid,
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const DOM_SID *groupsids)
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struct nt_user_token *result = NULL;
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DEBUG(10, ("Create local NT token for %s\n",
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sid_string_dbg(user_sid)));
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if (!(result = TALLOC_ZERO_P(mem_ctx, struct nt_user_token))) {
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DEBUG(0, ("talloc failed\n"));
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/* Add the user and primary group sid */
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status = add_sid_to_array(result, user_sid,
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&result->user_sids, &result->num_sids);
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if (!NT_STATUS_IS_OK(status)) {
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/* For guest, num_groupsids may be zero. */
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status = add_sid_to_array(result, &groupsids[0],
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if (!NT_STATUS_IS_OK(status)) {
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/* Add in BUILTIN sids */
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status = add_sid_to_array(result, &global_sid_World,
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&result->user_sids, &result->num_sids);
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if (!NT_STATUS_IS_OK(status)) {
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status = add_sid_to_array(result, &global_sid_Network,
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&result->user_sids, &result->num_sids);
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if (!NT_STATUS_IS_OK(status)) {
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status = add_sid_to_array(result, &global_sid_Builtin_Guests,
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if (!NT_STATUS_IS_OK(status)) {
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status = add_sid_to_array(result,
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&global_sid_Authenticated_Users,
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if (!NT_STATUS_IS_OK(status)) {
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/* Now the SIDs we got from authentication. These are the ones from
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* the info3 struct or from the pdb_enum_group_memberships, depending
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* on who authenticated the user.
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* Note that we start the for loop at "1" here, we already added the
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* first group sid as primary above. */
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for (i=1; i<num_groupsids; i++) {
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status = add_sid_to_array_unique(result, &groupsids[i],
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if (!NT_STATUS_IS_OK(status)) {
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/* Deal with the BUILTIN\Administrators group. If the SID can
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be resolved then assume that the add_aliasmem( S-1-5-32 )
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if (!sid_to_gid(&global_sid_Builtin_Administrators, &gid)) {
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if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) {
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status = NT_STATUS_OK;
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DEBUG(3, ("Failed to fetch domain sid for %s\n",
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status = create_builtin_administrators(&dom_sid);
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if (NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE)) {
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/* Add BUILTIN\Administrators directly to token. */
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status = add_builtin_administrators(result, &dom_sid);
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if ( !NT_STATUS_IS_OK(status) ) {
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DEBUG(3, ("Failed to check for local "
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"Administrators membership (%s)\n",
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} else if (!NT_STATUS_IS_OK(status)) {
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DEBUG(2, ("WARNING: Failed to create "
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"BUILTIN\\Administrators group! Can "
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"Winbind allocate gids?\n"));
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/* Deal with the BUILTIN\Users group. If the SID can
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be resolved then assume that the add_aliasmem( S-1-5-32 )
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if (!sid_to_gid(&global_sid_Builtin_Users, &gid)) {
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if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) {
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status = NT_STATUS_OK;
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DEBUG(3, ("Failed to fetch domain sid for %s\n",
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status = create_builtin_users(&dom_sid);
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if (!NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE) &&
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!NT_STATUS_IS_OK(status))
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DEBUG(2, ("WARNING: Failed to create BUILTIN\\Users group! "
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"Can Winbind allocate gids?\n"));
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/* Deal with local groups */
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if (lp_winbind_nested_groups()) {
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/* Now add the aliases. First the one from our local SAM */
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status = add_aliases(get_global_sam_sid(), result);
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if (!NT_STATUS_IS_OK(status)) {
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/* Finally the builtin ones */
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status = add_aliases(&global_sid_Builtin, result);
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if (!NT_STATUS_IS_OK(status)) {
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get_privileges_for_sids(&result->privileges, result->user_sids,
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/****************************************************************************
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prints a NT_USER_TOKEN to debug output.
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****************************************************************************/
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void debug_nt_user_token(int dbg_class, int dbg_lev, NT_USER_TOKEN *token)
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DEBUGC(dbg_class, dbg_lev, ("NT user token: (NULL)\n"));
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DEBUGC(dbg_class, dbg_lev,
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("NT user token of user %s\n",
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sid_string_dbg(&token->user_sids[0]) ));
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DEBUGADDC(dbg_class, dbg_lev,
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("contains %lu SIDs\n", (unsigned long)token->num_sids));
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for (i = 0; i < token->num_sids; i++)
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DEBUGADDC(dbg_class, dbg_lev,
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("SID[%3lu]: %s\n", (unsigned long)i,
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sid_string_dbg(&token->user_sids[i])));
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dump_se_priv( dbg_class, dbg_lev, &token->privileges );
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/****************************************************************************
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prints a UNIX 'token' to debug output.
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****************************************************************************/
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void debug_unix_user_token(int dbg_class, int dbg_lev, uid_t uid, gid_t gid,
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int n_groups, gid_t *groups)
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DEBUGC(dbg_class, dbg_lev,
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("UNIX token of user %ld\n", (long int)uid));
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DEBUGADDC(dbg_class, dbg_lev,
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("Primary group is %ld and contains %i supplementary "
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"groups\n", (long int)gid, n_groups));
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for (i = 0; i < n_groups; i++)
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DEBUGADDC(dbg_class, dbg_lev, ("Group[%3i]: %ld\n", i,
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(long int)groups[i]));