/*
* Unix SMB/CIFS implementation.
* Authentication utility functions
* Copyright (C) Andrew Tridgell 1992-1998
* Copyright (C) Andrew Bartlett 2001
* Copyright (C) Jeremy Allison 2000-2001
* Copyright (C) Rafal Szczesniak 2002
* Copyright (C) Volker Lendecke 2006
* Copyright (C) Michael Adam 2007
*
* 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 .
*/
/* functions moved from auth/auth_util.c to minimize linker deps */
#include "includes.h"
/****************************************************************************
Check for a SID in an NT_USER_TOKEN
****************************************************************************/
bool nt_token_check_sid ( const DOM_SID *sid, const NT_USER_TOKEN *token )
{
int i;
if ( !sid || !token )
return False;
for ( i=0; inum_sids; i++ ) {
if ( sid_equal( sid, &token->user_sids[i] ) )
return True;
}
return False;
}
bool nt_token_check_domain_rid( NT_USER_TOKEN *token, uint32 rid )
{
DOM_SID domain_sid;
/* if we are a domain member, the get the domain SID, else for
a DC or standalone server, use our own SID */
if ( lp_server_role() == ROLE_DOMAIN_MEMBER ) {
if ( !secrets_fetch_domain_sid( lp_workgroup(),
&domain_sid ) ) {
DEBUG(1,("nt_token_check_domain_rid: Cannot lookup "
"SID for domain [%s]\n", lp_workgroup()));
return False;
}
}
else
sid_copy( &domain_sid, get_global_sam_sid() );
sid_append_rid( &domain_sid, rid );
return nt_token_check_sid( &domain_sid, token );\
}
/******************************************************************************
Create a token for the root user to be used internally by smbd.
This is similar to running under the context of the LOCAL_SYSTEM account
in Windows. This is a read-only token. Do not modify it or free() it.
Create a copy if your need to change it.
******************************************************************************/
NT_USER_TOKEN *get_root_nt_token( void )
{
static NT_USER_TOKEN *token = NULL;
DOM_SID u_sid, g_sid;
struct passwd *pw;
if ( token )
return token;
if ( !(pw = sys_getpwnam( "root" )) ) {
DEBUG(0,("get_root_nt_token: getpwnam(\"root\") failed!\n"));
return NULL;
}
/* get the user and primary group SIDs; although the
BUILTIN\Administrators SId is really the one that matters here */
uid_to_sid(&u_sid, pw->pw_uid);
gid_to_sid(&g_sid, pw->pw_gid);
token = create_local_nt_token(NULL, &u_sid, False,
1, &global_sid_Builtin_Administrators);
return token;
}
/*
* Add alias SIDs from memberships within the partially created token SID list
*/
NTSTATUS add_aliases(const DOM_SID *domain_sid,
struct nt_user_token *token)
{
uint32 *aliases;
size_t i, num_aliases;
NTSTATUS status;
TALLOC_CTX *tmp_ctx;
if (!(tmp_ctx = talloc_init("add_aliases"))) {
return NT_STATUS_NO_MEMORY;
}
aliases = NULL;
num_aliases = 0;
status = pdb_enum_alias_memberships(tmp_ctx, domain_sid,
token->user_sids,
token->num_sids,
&aliases, &num_aliases);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(10, ("pdb_enum_alias_memberships failed: %s\n",
nt_errstr(status)));
TALLOC_FREE(tmp_ctx);
return status;
}
for (i=0; iuser_sids,
&token->num_sids)) {
DEBUG(0, ("add_sid_to_array failed\n"));
TALLOC_FREE(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
}
TALLOC_FREE(tmp_ctx);
return NT_STATUS_OK;
}
/*******************************************************************
*******************************************************************/
static NTSTATUS add_builtin_administrators( struct nt_user_token *token )
{
DOM_SID domadm;
/* nothing to do if we aren't in a domain */
if ( !(IS_DC || lp_server_role()==ROLE_DOMAIN_MEMBER) ) {
return NT_STATUS_OK;
}
/* Find the Domain Admins SID */
if ( IS_DC ) {
sid_copy( &domadm, get_global_sam_sid() );
} else {
if ( !secrets_fetch_domain_sid( lp_workgroup(), &domadm ) )
return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
}
sid_append_rid( &domadm, DOMAIN_GROUP_RID_ADMINS );
/* Add Administrators if the user beloongs to Domain Admins */
if ( nt_token_check_sid( &domadm, token ) ) {
if (!add_sid_to_array(token, &global_sid_Builtin_Administrators,
&token->user_sids, &token->num_sids)) {
return NT_STATUS_NO_MEMORY;
}
}
return NT_STATUS_OK;
}
/*******************************************************************
*******************************************************************/
static NTSTATUS create_builtin_users( void )
{
NTSTATUS status;
DOM_SID dom_users;
status = pdb_create_builtin_alias( BUILTIN_ALIAS_RID_USERS );
if ( !NT_STATUS_IS_OK(status) ) {
DEBUG(0,("create_builtin_users: Failed to create Users\n"));
return status;
}
/* add domain users */
if ((IS_DC || (lp_server_role() == ROLE_DOMAIN_MEMBER))
&& secrets_fetch_domain_sid(lp_workgroup(), &dom_users))
{
sid_append_rid(&dom_users, DOMAIN_GROUP_RID_USERS );
status = pdb_add_aliasmem( &global_sid_Builtin_Users, &dom_users);
if ( !NT_STATUS_IS_OK(status) ) {
DEBUG(0,("create_builtin_administrators: Failed to add Domain Users to"
" Users\n"));
return status;
}
}
return NT_STATUS_OK;
}
/*******************************************************************
*******************************************************************/
static NTSTATUS create_builtin_administrators( void )
{
NTSTATUS status;
DOM_SID dom_admins, root_sid;
fstring root_name;
enum lsa_SidType type;
TALLOC_CTX *ctx;
bool ret;
status = pdb_create_builtin_alias( BUILTIN_ALIAS_RID_ADMINS );
if ( !NT_STATUS_IS_OK(status) ) {
DEBUG(0,("create_builtin_administrators: Failed to create Administrators\n"));
return status;
}
/* add domain admins */
if ((IS_DC || (lp_server_role() == ROLE_DOMAIN_MEMBER))
&& secrets_fetch_domain_sid(lp_workgroup(), &dom_admins))
{
sid_append_rid(&dom_admins, DOMAIN_GROUP_RID_ADMINS);
status = pdb_add_aliasmem( &global_sid_Builtin_Administrators, &dom_admins );
if ( !NT_STATUS_IS_OK(status) ) {
DEBUG(0,("create_builtin_administrators: Failed to add Domain Admins"
" Administrators\n"));
return status;
}
}
/* add root */
if ( (ctx = talloc_init("create_builtin_administrators")) == NULL ) {
return NT_STATUS_NO_MEMORY;
}
fstr_sprintf( root_name, "%s\\root", get_global_sam_name() );
ret = lookup_name( ctx, root_name, 0, NULL, NULL, &root_sid, &type );
TALLOC_FREE( ctx );
if ( ret ) {
status = pdb_add_aliasmem( &global_sid_Builtin_Administrators, &root_sid );
if ( !NT_STATUS_IS_OK(status) ) {
DEBUG(0,("create_builtin_administrators: Failed to add root"
" Administrators\n"));
return status;
}
}
return NT_STATUS_OK;
}
/*******************************************************************
Create a NT token for the user, expanding local aliases
*******************************************************************/
struct nt_user_token *create_local_nt_token(TALLOC_CTX *mem_ctx,
const DOM_SID *user_sid,
bool is_guest,
int num_groupsids,
const DOM_SID *groupsids)
{
struct nt_user_token *result = NULL;
int i;
NTSTATUS status;
gid_t gid;
DEBUG(10, ("Create local NT token for %s\n", sid_string_static(user_sid)));
if (!(result = TALLOC_ZERO_P(mem_ctx, NT_USER_TOKEN))) {
DEBUG(0, ("talloc failed\n"));
return NULL;
}
/* Add the user and primary group sid */
if (!add_sid_to_array(result, user_sid,
&result->user_sids, &result->num_sids)) {
return NULL;
}
/* For guest, num_groupsids may be zero. */
if (num_groupsids) {
if (!add_sid_to_array(result, &groupsids[0],
&result->user_sids, &result->num_sids)) {
return NULL;
}
}
/* Add in BUILTIN sids */
if (!add_sid_to_array(result, &global_sid_World,
&result->user_sids, &result->num_sids)) {
return NULL;
}
if (!add_sid_to_array(result, &global_sid_Network,
&result->user_sids, &result->num_sids)) {
return NULL;
}
if (is_guest) {
if (!add_sid_to_array(result, &global_sid_Builtin_Guests,
&result->user_sids, &result->num_sids)) {
return NULL;
}
} else {
if (!add_sid_to_array(result, &global_sid_Authenticated_Users,
&result->user_sids, &result->num_sids)) {
return NULL;
}
}
/* Now the SIDs we got from authentication. These are the ones from
* the info3 struct or from the pdb_enum_group_memberships, depending
* on who authenticated the user.
* Note that we start the for loop at "1" here, we already added the
* first group sid as primary above. */
for (i=1; iuser_sids, &result->num_sids)) {
return NULL;
}
}
/* Deal with the BUILTIN\Administrators group. If the SID can
be resolved then assume that the add_aliasmem( S-1-5-32 )
handled it. */
if ( !sid_to_gid( &global_sid_Builtin_Administrators, &gid ) ) {
/* We can only create a mapping if winbind is running
and the nested group functionality has been enabled */
if ( lp_winbind_nested_groups() && winbind_ping() ) {
become_root();
status = create_builtin_administrators( );
if ( !NT_STATUS_IS_OK(status) ) {
DEBUG(2,("create_local_nt_token: Failed to create BUILTIN\\Administrators group!\n"));
/* don't fail, just log the message */
}
unbecome_root();
}
else {
status = add_builtin_administrators( result );
if ( !NT_STATUS_IS_OK(status) ) {
/* just log a complaint but do not fail */
DEBUG(3,("create_local_nt_token: failed to check for local Administrators"
" membership (%s)\n", nt_errstr(status)));
}
}
}
/* Deal with the BUILTIN\Users group. If the SID can
be resolved then assume that the add_aliasmem( S-1-5-32 )
handled it. */
if ( !sid_to_gid( &global_sid_Builtin_Users, &gid ) ) {
/* We can only create a mapping if winbind is running
and the nested group functionality has been enabled */
if ( lp_winbind_nested_groups() && winbind_ping() ) {
become_root();
status = create_builtin_users( );
if ( !NT_STATUS_IS_OK(status) ) {
DEBUG(2,("create_local_nt_token: Failed to create BUILTIN\\Users group!\n"));
/* don't fail, just log the message */
}
unbecome_root();
}
}
/* Deal with local groups */
if (lp_winbind_nested_groups()) {
become_root();
/* Now add the aliases. First the one from our local SAM */
status = add_aliases(get_global_sam_sid(), result);
if (!NT_STATUS_IS_OK(status)) {
unbecome_root();
TALLOC_FREE(result);
return NULL;
}
/* Finally the builtin ones */
status = add_aliases(&global_sid_Builtin, result);
if (!NT_STATUS_IS_OK(status)) {
unbecome_root();
TALLOC_FREE(result);
return NULL;
}
unbecome_root();
}
get_privileges_for_sids(&result->privileges, result->user_sids,
result->num_sids);
return result;
}
/****************************************************************************
prints a NT_USER_TOKEN to debug output.
****************************************************************************/
void debug_nt_user_token(int dbg_class, int dbg_lev, NT_USER_TOKEN *token)
{
size_t i;
if (!token) {
DEBUGC(dbg_class, dbg_lev, ("NT user token: (NULL)\n"));
return;
}
DEBUGC(dbg_class, dbg_lev,
("NT user token of user %s\n",
sid_string_static(&token->user_sids[0]) ));
DEBUGADDC(dbg_class, dbg_lev,
("contains %lu SIDs\n", (unsigned long)token->num_sids));
for (i = 0; i < token->num_sids; i++)
DEBUGADDC(dbg_class, dbg_lev,
("SID[%3lu]: %s\n", (unsigned long)i,
sid_string_static(&token->user_sids[i])));
dump_se_priv( dbg_class, dbg_lev, &token->privileges );
}
/****************************************************************************
prints a UNIX 'token' to debug output.
****************************************************************************/
void debug_unix_user_token(int dbg_class, int dbg_lev, uid_t uid, gid_t gid,
int n_groups, gid_t *groups)
{
int i;
DEBUGC(dbg_class, dbg_lev,
("UNIX token of user %ld\n", (long int)uid));
DEBUGADDC(dbg_class, dbg_lev,
("Primary group is %ld and contains %i supplementary "
"groups\n", (long int)gid, n_groups));
for (i = 0; i < n_groups; i++)
DEBUGADDC(dbg_class, dbg_lev, ("Group[%3i]: %ld\n", i,
(long int)groups[i]));
}
/* END */