srv_svcctl_nt.c   [plain text]

/* 
 *  Unix SMB/CIFS implementation.
 *  RPC Pipe client / server routines
 *
 *  Copyright (C) Marcin Krzysztof Porwit           2005.
 * 
 *  Largely Rewritten (Again) by:
 *  Copyright (C) Gerald (Jerry) Carter             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 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"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_RPC_SRV

struct service_control_op {
	const char *name;
	SERVICE_CONTROL_OPS *ops;
};

#define SVCCTL_NUM_INTERNAL_SERVICES	4

/* handle external services */
extern SERVICE_CONTROL_OPS rcinit_svc_ops;

/* builtin services (see service_db.c and services/svc_*.c */
extern SERVICE_CONTROL_OPS spoolss_svc_ops;
extern SERVICE_CONTROL_OPS netlogon_svc_ops;
extern SERVICE_CONTROL_OPS winreg_svc_ops;
extern SERVICE_CONTROL_OPS wins_svc_ops;

/* make sure this number patches the number of builtin
   SERVICE_CONTROL_OPS structure listed above */

#define SVCCTL_NUM_INTERNAL_SERVICES	4

struct service_control_op *svcctl_ops;

static struct generic_mapping scm_generic_map =
	{ SC_MANAGER_READ_ACCESS, SC_MANAGER_WRITE_ACCESS, SC_MANAGER_EXECUTE_ACCESS, SC_MANAGER_ALL_ACCESS };
static struct generic_mapping svc_generic_map =
	{ SERVICE_READ_ACCESS, SERVICE_WRITE_ACCESS, SERVICE_EXECUTE_ACCESS, SERVICE_ALL_ACCESS };


/********************************************************************
********************************************************************/

BOOL init_service_op_table( void )
{
	const char **service_list = lp_svcctl_list();
	int num_services = SVCCTL_NUM_INTERNAL_SERVICES + str_list_count( service_list );
	int i;
	
	if ( !(svcctl_ops = TALLOC_ARRAY( NULL, struct service_control_op, num_services+1)) ) {
		DEBUG(0,("init_service_op_table: talloc() failed!\n"));
		return False;
	}

	/* services listed in smb.conf get the rc.init interface */
	
	for ( i=0; service_list && service_list[i]; i++ ) {
		svcctl_ops[i].name = talloc_strdup( svcctl_ops, service_list[i] );
		svcctl_ops[i].ops  = &rcinit_svc_ops;
	}
	
	/* add builtin services */
	
	svcctl_ops[i].name = talloc_strdup( svcctl_ops, "Spooler" );
	svcctl_ops[i].ops  = &spoolss_svc_ops;
	i++;
	
	svcctl_ops[i].name = talloc_strdup( svcctl_ops, "NETLOGON" );
	svcctl_ops[i].ops  = &netlogon_svc_ops;
	i++;
	
	svcctl_ops[i].name = talloc_strdup( svcctl_ops, "RemoteRegistry" );
	svcctl_ops[i].ops  = &winreg_svc_ops;
	i++;
	
	svcctl_ops[i].name = talloc_strdup( svcctl_ops, "WINS" );
	svcctl_ops[i].ops  = &wins_svc_ops;
	i++;
	
	/* NULL terminate the array */
	
	svcctl_ops[i].name = NULL;
	svcctl_ops[i].ops  = NULL;
	
	return True;
}

/********************************************************************
********************************************************************/

static struct service_control_op* find_service_by_name( const char *name )
{
	int i;

	for ( i=0; svcctl_ops[i].name; i++ ) {
		if ( strequal( name, svcctl_ops[i].name ) )
			return &svcctl_ops[i];
	}

	return NULL;
}
/********************************************************************
********************************************************************/

static NTSTATUS svcctl_access_check( SEC_DESC *sec_desc, NT_USER_TOKEN *token, 
                                     uint32 access_desired, uint32 *access_granted )
{
	NTSTATUS result;

	if ( geteuid() == sec_initial_uid() ) {
		DEBUG(5,("svcctl_access_check: using root's token\n"));
		token = get_root_nt_token();
	}
	
	se_access_check( sec_desc, token, access_desired, access_granted, &result );

	return result;
}

/********************************************************************
********************************************************************/

static SEC_DESC* construct_scm_sd( TALLOC_CTX *ctx )
{
	SEC_ACE ace[2];	
	SEC_ACCESS mask;
	size_t i = 0;
	SEC_DESC *sd;
	SEC_ACL *acl;
	size_t sd_size;

	/* basic access for Everyone */
	
	init_sec_access(&mask, SC_MANAGER_READ_ACCESS );
	init_sec_ace(&ace[i++], &global_sid_World, SEC_ACE_TYPE_ACCESS_ALLOWED, mask, 0);
	
	/* Full Access 'BUILTIN\Administrators' */
	
	init_sec_access(&mask,SC_MANAGER_ALL_ACCESS );
	init_sec_ace(&ace[i++], &global_sid_Builtin_Administrators, SEC_ACE_TYPE_ACCESS_ALLOWED, mask, 0);
	
	
	/* create the security descriptor */
	
	if ( !(acl = make_sec_acl(ctx, NT4_ACL_REVISION, i, ace)) )
		return NULL;

	if ( !(sd = make_sec_desc(ctx, SEC_DESC_REVISION, SEC_DESC_SELF_RELATIVE, NULL, NULL, NULL, acl, &sd_size)) )
		return NULL;

	return sd;
}

/******************************************************************
 free() function for REGISTRY_KEY
 *****************************************************************/
 
static void free_service_handle_info(void *ptr)
{
	TALLOC_FREE( ptr );
}

/******************************************************************
 Find a registry key handle and return a SERVICE_INFO
 *****************************************************************/

static SERVICE_INFO *find_service_info_by_hnd(pipes_struct *p, POLICY_HND *hnd)
{
	SERVICE_INFO *service_info = NULL;

	if( !find_policy_by_hnd( p, hnd, (void **)(void *)&service_info) ) {
		DEBUG(2,("find_service_info_by_hnd: handle not found"));
		return NULL;
	}

	return service_info;
}

/******************************************************************
 *****************************************************************/
 
static WERROR create_open_service_handle( pipes_struct *p, POLICY_HND *handle, uint32 type,
                                          const char *service, uint32 access_granted )
{
	SERVICE_INFO *info = NULL;
	WERROR result = WERR_OK;
	struct service_control_op *s_op;
	
	if ( !(info = TALLOC_ZERO_P( NULL, SERVICE_INFO )) )
		return WERR_NOMEM;

	/* the Service Manager has a NULL name */
	
	info->type = SVC_HANDLE_IS_SCM;
	
	switch ( type ) {
	case SVC_HANDLE_IS_SCM:
		info->type = SVC_HANDLE_IS_SCM;
		break;

	case SVC_HANDLE_IS_DBLOCK:
		info->type = SVC_HANDLE_IS_DBLOCK;
		break;
		
	case SVC_HANDLE_IS_SERVICE:
		info->type = SVC_HANDLE_IS_SERVICE;
		
		/* lookup the SERVICE_CONTROL_OPS */

		if ( !(s_op = find_service_by_name( service )) ) {
			result = WERR_NO_SUCH_SERVICE;
			goto done;
		}
		
		info->ops = s_op->ops;

		if ( !(info->name  = talloc_strdup( info, s_op->name )) ) {
			result = WERR_NOMEM;
			goto done;
		}
		break;

	default:
		result = WERR_NO_SUCH_SERVICE;
		goto done;
	}

	info->access_granted = access_granted;	
	
	/* store the SERVICE_INFO and create an open handle */
	
	if ( !create_policy_hnd( p, handle, free_service_handle_info, info ) ) {
		result = WERR_ACCESS_DENIED;
		goto done;
	}
		
done:
	if ( !W_ERROR_IS_OK(result) )
		free_service_handle_info( info );

	return result;
}

/********************************************************************
********************************************************************/

WERROR _svcctl_open_scmanager(pipes_struct *p, SVCCTL_Q_OPEN_SCMANAGER *q_u, SVCCTL_R_OPEN_SCMANAGER *r_u)
{
	SEC_DESC *sec_desc;
	uint32 access_granted = 0;
	NTSTATUS status;
	
	/* perform access checks */
	
	if ( !(sec_desc = construct_scm_sd( p->mem_ctx )) )
		return WERR_NOMEM;
		
	se_map_generic( &q_u->access, &scm_generic_map );
	status = svcctl_access_check( sec_desc, p->pipe_user.nt_user_token, q_u->access, &access_granted );
	if ( !NT_STATUS_IS_OK(status) )
		return ntstatus_to_werror( status );
		
	return create_open_service_handle( p, &r_u->handle, SVC_HANDLE_IS_SCM, NULL, access_granted );
}

/********************************************************************
********************************************************************/

WERROR _svcctl_open_service(pipes_struct *p, SVCCTL_Q_OPEN_SERVICE *q_u, SVCCTL_R_OPEN_SERVICE *r_u)
{
	SEC_DESC *sec_desc;
	uint32 access_granted = 0;
	NTSTATUS status;
	pstring service;

	rpcstr_pull(service, q_u->servicename.buffer, sizeof(service), q_u->servicename.uni_str_len*2, 0);
	
  	DEBUG(5, ("_svcctl_open_service: Attempting to open Service [%s], \n", service));

	
	/* based on my tests you can open a service if you have a valid scm handle */
	
	if ( !find_service_info_by_hnd( p, &q_u->handle ) )
		return WERR_BADFID;
			
	/* perform access checks.  Use the root token in order to ensure that we 
	   retrieve the security descriptor */
	
	if ( !(sec_desc = svcctl_get_secdesc( p->mem_ctx, service, get_root_nt_token() )) )
		return WERR_NOMEM;
		
	se_map_generic( &q_u->access, &svc_generic_map );
	status = svcctl_access_check( sec_desc, p->pipe_user.nt_user_token, q_u->access, &access_granted );
	if ( !NT_STATUS_IS_OK(status) )
		return ntstatus_to_werror( status );
	
	return create_open_service_handle( p, &r_u->handle, SVC_HANDLE_IS_SERVICE, service, access_granted );
}

/********************************************************************
********************************************************************/

WERROR _svcctl_close_service(pipes_struct *p, SVCCTL_Q_CLOSE_SERVICE *q_u, SVCCTL_R_CLOSE_SERVICE *r_u)
{
	return close_policy_hnd( p, &q_u->handle ) ? WERR_OK : WERR_BADFID;
}

/********************************************************************
********************************************************************/

WERROR _svcctl_get_display_name(pipes_struct *p, SVCCTL_Q_GET_DISPLAY_NAME *q_u, SVCCTL_R_GET_DISPLAY_NAME *r_u)
{
	fstring service;
	const char *display_name;
	SERVICE_INFO *info = find_service_info_by_hnd( p, &q_u->handle );
	
	/* can only use an SCM handle here */
	
	if ( !info || (info->type != SVC_HANDLE_IS_SCM) )
		return WERR_BADFID;
		
	rpcstr_pull(service, q_u->servicename.buffer, sizeof(service), q_u->servicename.uni_str_len*2, 0);
	
	display_name = svcctl_lookup_dispname( service, p->pipe_user.nt_user_token );
	init_svcctl_r_get_display_name( r_u, display_name );

	return WERR_OK;
}

/********************************************************************
********************************************************************/

WERROR _svcctl_query_status(pipes_struct *p, SVCCTL_Q_QUERY_STATUS *q_u, SVCCTL_R_QUERY_STATUS *r_u)
{
	SERVICE_INFO *info = find_service_info_by_hnd( p, &q_u->handle );
	
	/* perform access checks */

	if ( !info || (info->type != SVC_HANDLE_IS_SERVICE) )
		return WERR_BADFID;
		
	if ( !(info->access_granted & SC_RIGHT_SVC_QUERY_STATUS) )
		return WERR_ACCESS_DENIED;
		
	/* try the service specific status call */

	return info->ops->service_status( info->name, &r_u->svc_status );
}

/********************************************************************
********************************************************************/

static int enumerate_status( TALLOC_CTX *ctx, ENUM_SERVICES_STATUS **status, NT_USER_TOKEN *token )
{
	int num_services = 0;
	int i;
	ENUM_SERVICES_STATUS *st;
	const char *display_name;
	
	/* just count */
	while ( svcctl_ops[num_services].name )
		num_services++;

	if ( !(st = TALLOC_ARRAY( ctx, ENUM_SERVICES_STATUS, num_services )) ) {
		DEBUG(0,("enumerate_status: talloc() failed!\n"));
		return -1;
	}
	
	for ( i=0; i<num_services; i++ ) {
		init_unistr( &st[i].servicename, svcctl_ops[i].name );
		
		display_name = svcctl_lookup_dispname( svcctl_ops[i].name, token );
		init_unistr( &st[i].displayname, display_name );
		
		svcctl_ops[i].ops->service_status( svcctl_ops[i].name, &st[i].status );
	}
	
	*status = st;

	return num_services;
}

/********************************************************************
********************************************************************/

WERROR _svcctl_enum_services_status(pipes_struct *p, SVCCTL_Q_ENUM_SERVICES_STATUS *q_u, SVCCTL_R_ENUM_SERVICES_STATUS *r_u)
{
	ENUM_SERVICES_STATUS *services = NULL;
	int num_services;
	int i = 0;
	size_t buffer_size = 0;
	WERROR result = WERR_OK;
	SERVICE_INFO *info = find_service_info_by_hnd( p, &q_u->handle );
	NT_USER_TOKEN *token = p->pipe_user.nt_user_token;
	
	/* perform access checks */

	if ( !info || (info->type != SVC_HANDLE_IS_SCM) )
		return WERR_BADFID;
		
	if ( !(info->access_granted & SC_RIGHT_MGR_ENUMERATE_SERVICE) ) {
		return WERR_ACCESS_DENIED;
	}

	num_services = enumerate_status( p->mem_ctx, &services, token );
	if (num_services == -1 ) {
		return WERR_NOMEM;
	}

        for ( i=0; i<num_services; i++ ) {
		buffer_size += svcctl_sizeof_enum_services_status(&services[i]);
	}

	buffer_size += buffer_size % 4;

	if (buffer_size > q_u->buffer_size ) {
		num_services = 0;
		result = WERR_MORE_DATA;
	}

	rpcbuf_init(&r_u->buffer, q_u->buffer_size, p->mem_ctx);

	if ( W_ERROR_IS_OK(result) ) {
		for ( i=0; i<num_services; i++ )
			svcctl_io_enum_services_status( "", &services[i], &r_u->buffer, 0 );
	}

	r_u->needed      = (buffer_size > q_u->buffer_size) ? buffer_size : q_u->buffer_size;
	r_u->returned    = (uint32)num_services;

	if ( !(r_u->resume = TALLOC_P( p->mem_ctx, uint32 )) )
		return WERR_NOMEM;

	*r_u->resume = 0x0;

	return result;
}

/********************************************************************
********************************************************************/

WERROR _svcctl_start_service(pipes_struct *p, SVCCTL_Q_START_SERVICE *q_u, SVCCTL_R_START_SERVICE *r_u)
{
	SERVICE_INFO *info = find_service_info_by_hnd( p, &q_u->handle );
	
	/* perform access checks */

	if ( !info || (info->type != SVC_HANDLE_IS_SERVICE) )
		return WERR_BADFID;
	
	if ( !(info->access_granted & SC_RIGHT_SVC_START) )
		return WERR_ACCESS_DENIED;
		
	return info->ops->start_service( info->name );
}

/********************************************************************
********************************************************************/

WERROR _svcctl_control_service(pipes_struct *p, SVCCTL_Q_CONTROL_SERVICE *q_u, SVCCTL_R_CONTROL_SERVICE *r_u)
{
	SERVICE_INFO *info = find_service_info_by_hnd( p, &q_u->handle );
	
	/* perform access checks */
	
	if ( !info || (info->type != SVC_HANDLE_IS_SERVICE) )
		return WERR_BADFID;	
	
	switch ( q_u->control ) {
	case SVCCTL_CONTROL_STOP:
		if ( !(info->access_granted & SC_RIGHT_SVC_STOP) )
			return WERR_ACCESS_DENIED;
			
		return info->ops->stop_service( info->name, &r_u->svc_status );
		
	case SVCCTL_CONTROL_INTERROGATE:
		if ( !(info->access_granted & SC_RIGHT_SVC_QUERY_STATUS) )
			return WERR_ACCESS_DENIED;
			
		return info->ops->service_status( info->name, &r_u->svc_status );
	}
	
	/* default control action */
	
	return WERR_ACCESS_DENIED;
}

/********************************************************************
********************************************************************/

WERROR _svcctl_enum_dependent_services( pipes_struct *p, SVCCTL_Q_ENUM_DEPENDENT_SERVICES *q_u, SVCCTL_R_ENUM_DEPENDENT_SERVICES *r_u )
{
	SERVICE_INFO *info = find_service_info_by_hnd( p, &q_u->handle );
	
	/* perform access checks */

	if ( !info || (info->type != SVC_HANDLE_IS_SERVICE) )
		return WERR_BADFID;	
	
	if ( !(info->access_granted & SC_RIGHT_SVC_ENUMERATE_DEPENDENTS) )
		return WERR_ACCESS_DENIED;
			
	/* we have to set the outgoing buffer size to the same as the 
	   incoming buffer size (even in the case of failure */

	rpcbuf_init( &r_u->buffer, q_u->buffer_size, p->mem_ctx );
				
	r_u->needed      = q_u->buffer_size;
	
	/* no dependent services...basically a stub function */
	r_u->returned    = 0;

	return WERR_OK;
}

/********************************************************************
********************************************************************/

WERROR _svcctl_query_service_status_ex( pipes_struct *p, SVCCTL_Q_QUERY_SERVICE_STATUSEX *q_u, SVCCTL_R_QUERY_SERVICE_STATUSEX *r_u )
{
	SERVICE_INFO *info = find_service_info_by_hnd( p, &q_u->handle );
	uint32 buffer_size;
	
	/* perform access checks */

	if ( !info || (info->type != SVC_HANDLE_IS_SERVICE) )
		return WERR_BADFID;	
	
	if ( !(info->access_granted & SC_RIGHT_SVC_QUERY_STATUS) )
		return WERR_ACCESS_DENIED;

	/* we have to set the outgoing buffer size to the same as the 
	   incoming buffer size (even in the case of failure) */

	rpcbuf_init( &r_u->buffer, q_u->buffer_size, p->mem_ctx );
	r_u->needed = q_u->buffer_size;
	
	switch ( q_u->level ) {
		case SVC_STATUS_PROCESS_INFO:
		{
			SERVICE_STATUS_PROCESS svc_stat_proc;

			/* Get the status of the service.. */
			info->ops->service_status( info->name, &svc_stat_proc.status );
			svc_stat_proc.process_id     = sys_getpid();
			svc_stat_proc.service_flags  = 0x0;

			svcctl_io_service_status_process( "", &svc_stat_proc, &r_u->buffer, 0 );
	                buffer_size = sizeof(SERVICE_STATUS_PROCESS);
			break;
		}
			
		default:
			return WERR_UNKNOWN_LEVEL; 
	}

	
        buffer_size += buffer_size % 4;
	r_u->needed = (buffer_size > q_u->buffer_size) ? buffer_size : q_u->buffer_size;

        if (buffer_size > q_u->buffer_size ) 
                return WERR_MORE_DATA;
	
	return WERR_OK;
}

/********************************************************************
********************************************************************/

static WERROR fill_svc_config( TALLOC_CTX *ctx, const char *name, SERVICE_CONFIG *config, NT_USER_TOKEN *token )
{
	REGVAL_CTR *values;
	REGISTRY_VALUE *val;

	/* retrieve the registry values for this service */
	
	if ( !(values = svcctl_fetch_regvalues( name, token )) )
		return WERR_REG_CORRUPT;
	
	/* now fill in the individual values */
		
	config->displayname = TALLOC_ZERO_P( ctx, UNISTR2 );
	if ( (val = regval_ctr_getvalue( values, "DisplayName" )) != NULL )
		init_unistr2( config->displayname, regval_sz( val ), UNI_STR_TERMINATE );
	else
		init_unistr2( config->displayname, name, UNI_STR_TERMINATE );

	if ( (val = regval_ctr_getvalue( values, "ObjectName" )) != NULL ) {
		config->startname = TALLOC_ZERO_P( ctx, UNISTR2 );		
		init_unistr2( config->startname, regval_sz( val ), UNI_STR_TERMINATE );
	}
		
	if ( (val = regval_ctr_getvalue( values, "ImagePath" )) != NULL ) {
		config->executablepath = TALLOC_ZERO_P( ctx, UNISTR2 );		
		init_unistr2( config->executablepath, regval_sz( val ), UNI_STR_TERMINATE );
	}

	/* a few hard coded values */
	/* loadordergroup and dependencies are empty */
	
	config->tag_id           = 0x00000000;			/* unassigned loadorder group */
	config->service_type     = SVCCTL_WIN32_OWN_PROC;
	config->error_control    = SVCCTL_SVC_ERROR_NORMAL;

	/* set the start type.  NetLogon and WINS are disabled to prevent 
	   the client from showing the "Start" button (if of course the services
	   are not running */

	if ( strequal( name, "NETLOGON" ) && ( lp_servicenumber(name) == -1 ) )
		config->start_type = SVCCTL_DISABLED;
	else if ( strequal( name, "WINS" ) && ( !lp_wins_support() ))
		config->start_type = SVCCTL_DISABLED;
	else
		config->start_type = SVCCTL_DEMAND_START;
	

	TALLOC_FREE( values );

	return WERR_OK;
}

/********************************************************************
********************************************************************/

WERROR _svcctl_query_service_config( pipes_struct *p, SVCCTL_Q_QUERY_SERVICE_CONFIG *q_u, SVCCTL_R_QUERY_SERVICE_CONFIG *r_u )
{
	SERVICE_INFO *info = find_service_info_by_hnd( p, &q_u->handle );
	uint32 buffer_size;
	WERROR wresult;
	
	/* perform access checks */

	if ( !info || (info->type != SVC_HANDLE_IS_SERVICE) )
		return WERR_BADFID;	
	
	if ( !(info->access_granted & SC_RIGHT_SVC_QUERY_CONFIG) )
		return WERR_ACCESS_DENIED;

	/* we have to set the outgoing buffer size to the same as the 
	   incoming buffer size (even in the case of failure */

	r_u->needed      = q_u->buffer_size;
	
	wresult = fill_svc_config( p->mem_ctx, info->name, &r_u->config, p->pipe_user.nt_user_token );
	if ( !W_ERROR_IS_OK(wresult) )
		return wresult;
	
	buffer_size = svcctl_sizeof_service_config( &r_u->config );
	r_u->needed = (buffer_size > q_u->buffer_size) ? buffer_size : q_u->buffer_size;

        if (buffer_size > q_u->buffer_size ) {
		ZERO_STRUCTP( &r_u->config );
                return WERR_INSUFFICIENT_BUFFER;
	}
		
	return WERR_OK;
}

/********************************************************************
********************************************************************/

WERROR _svcctl_query_service_config2( pipes_struct *p, SVCCTL_Q_QUERY_SERVICE_CONFIG2 *q_u, SVCCTL_R_QUERY_SERVICE_CONFIG2 *r_u )
{
	SERVICE_INFO *info = find_service_info_by_hnd( p, &q_u->handle );
	uint32 buffer_size;
	
	/* perform access checks */

	if ( !info || (info->type != SVC_HANDLE_IS_SERVICE) )
		return WERR_BADFID;	
	
	if ( !(info->access_granted & SC_RIGHT_SVC_QUERY_CONFIG) )
		return WERR_ACCESS_DENIED;
 
	/* we have to set the outgoing buffer size to the same as the 
	   incoming buffer size (even in the case of failure */

	rpcbuf_init( &r_u->buffer, q_u->buffer_size, p->mem_ctx );
	r_u->needed = q_u->buffer_size;

	switch ( q_u->level ) {
	case SERVICE_CONFIG_DESCRIPTION:
		{
			SERVICE_DESCRIPTION desc_buf;
			const char *description;
			
			description = svcctl_lookup_description( info->name, p->pipe_user.nt_user_token );
			
			ZERO_STRUCTP( &desc_buf );

			init_service_description_buffer( &desc_buf, description );
			svcctl_io_service_description( "", &desc_buf, &r_u->buffer, 0 );
	                buffer_size = svcctl_sizeof_service_description( &desc_buf );

			break;
		}
		break;
	case SERVICE_CONFIG_FAILURE_ACTIONS:
		{
			SERVICE_FAILURE_ACTIONS actions;

			/* nothing to say...just service the request */

			ZERO_STRUCTP( &actions );
			svcctl_io_service_fa( "", &actions, &r_u->buffer, 0 );
	                buffer_size = svcctl_sizeof_service_fa( &actions );

			break;
		}
		break;

	default:
		return WERR_UNKNOWN_LEVEL;
	}
	
	buffer_size += buffer_size % 4;
	r_u->needed = (buffer_size > q_u->buffer_size) ? buffer_size : q_u->buffer_size;

        if (buffer_size > q_u->buffer_size )
                return WERR_INSUFFICIENT_BUFFER;

	return WERR_OK;
}

/********************************************************************
********************************************************************/

WERROR _svcctl_lock_service_db( pipes_struct *p, SVCCTL_Q_LOCK_SERVICE_DB *q_u, SVCCTL_R_LOCK_SERVICE_DB *r_u )
{
	SERVICE_INFO *info = find_service_info_by_hnd( p, &q_u->handle );
	
	/* perform access checks */

	if ( !info || (info->type != SVC_HANDLE_IS_SCM) )
		return WERR_BADFID;	
	
	if ( !(info->access_granted & SC_RIGHT_MGR_LOCK) )
		return WERR_ACCESS_DENIED;

	/* Just open a handle.  Doesn't actually lock anything */
	
	return create_open_service_handle( p, &r_u->h_lock, SVC_HANDLE_IS_DBLOCK, NULL, 0 );
;
}

/********************************************************************
********************************************************************/

WERROR _svcctl_unlock_service_db( pipes_struct *p, SVCCTL_Q_UNLOCK_SERVICE_DB *q_u, SVCCTL_R_UNLOCK_SERVICE_DB *r_u )
{
	SERVICE_INFO *info = find_service_info_by_hnd( p, &q_u->h_lock );


	if ( !info || (info->type != SVC_HANDLE_IS_DBLOCK) )
		return WERR_BADFID;	
		
	return close_policy_hnd( p, &q_u->h_lock) ? WERR_OK : WERR_BADFID;
}

/********************************************************************
********************************************************************/

WERROR _svcctl_query_service_sec( pipes_struct *p, SVCCTL_Q_QUERY_SERVICE_SEC *q_u, SVCCTL_R_QUERY_SERVICE_SEC *r_u )
{
	SERVICE_INFO *info = find_service_info_by_hnd( p, &q_u->handle );
	SEC_DESC *sec_desc;


	/* only support the SCM and individual services */

	if ( !info || !(info->type & (SVC_HANDLE_IS_SERVICE|SVC_HANDLE_IS_SCM)) )
		return WERR_BADFID;	

	/* check access reights (according to MSDN) */

	if ( !(info->access_granted & STD_RIGHT_READ_CONTROL_ACCESS) )
		return WERR_ACCESS_DENIED;

	/* TODO: handle something besides DACL_SECURITY_INFORMATION */

	if ( (q_u->security_flags & DACL_SECURITY_INFORMATION) != DACL_SECURITY_INFORMATION )
		return WERR_INVALID_PARAM;

	/* lookup the security descriptor and marshall it up for a reply */

	if ( !(sec_desc = svcctl_get_secdesc( p->mem_ctx, info->name, get_root_nt_token() )) )
                return WERR_NOMEM;

	r_u->needed = sec_desc_size( sec_desc );

	if ( r_u->needed > q_u->buffer_size ) {
		ZERO_STRUCTP( &r_u->buffer );
		return WERR_INSUFFICIENT_BUFFER;
	}

	rpcbuf_init( &r_u->buffer, q_u->buffer_size, p->mem_ctx );

	if ( !sec_io_desc("", &sec_desc, &r_u->buffer.prs, 0 ) )
		return WERR_NOMEM;
		
	return WERR_OK;
}

/********************************************************************
********************************************************************/

WERROR _svcctl_set_service_sec( pipes_struct *p, SVCCTL_Q_SET_SERVICE_SEC *q_u, SVCCTL_R_SET_SERVICE_SEC *r_u )
{
	SERVICE_INFO *info = find_service_info_by_hnd( p, &q_u->handle );
	SEC_DESC *sec_desc = NULL;
	uint32 required_access;

	if ( !info || !(info->type & (SVC_HANDLE_IS_SERVICE|SVC_HANDLE_IS_SCM))  )
		return WERR_BADFID;

	/* can't set the security de4scriptor on the ServiceControlManager */

	if ( info->type == SVC_HANDLE_IS_SCM )
		return WERR_ACCESS_DENIED;	

	/* check the access on the open handle */
	
	switch ( q_u->security_flags ) {
		case DACL_SECURITY_INFORMATION:
			required_access = STD_RIGHT_WRITE_DAC_ACCESS;
			break;
			
		case OWNER_SECURITY_INFORMATION:
		case GROUP_SECURITY_INFORMATION:
			required_access = STD_RIGHT_WRITE_OWNER_ACCESS;
			break;
			
		case SACL_SECURITY_INFORMATION:
			return WERR_INVALID_PARAM;
		default:
			return WERR_INVALID_PARAM;
	}
	
	if ( !(info->access_granted & required_access) )
		return WERR_ACCESS_DENIED;
	
	/* read the security descfriptor */
		
	if ( !sec_io_desc("", &sec_desc, &q_u->buffer.prs, 0 ) )
		return WERR_NOMEM;
		
	/* store the new SD */

	if ( !svcctl_set_secdesc( p->mem_ctx, info->name, sec_desc, p->pipe_user.nt_user_token ) ) 
		return WERR_ACCESS_DENIED;

	return WERR_OK;
}