569 lines
16 KiB
C
569 lines
16 KiB
C
/*
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* Server-side objects
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*
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* Copyright (C) 1998 Alexandre Julliard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "config.h"
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#include "wine/port.h"
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#include <assert.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdarg.h>
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#include "ntstatus.h"
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#define WIN32_NO_STATUS
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#include "winternl.h"
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#include "file.h"
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#include "process.h"
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#include "thread.h"
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#include "unicode.h"
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#include "security.h"
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struct object_name
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{
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struct list entry; /* entry in the hash list */
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struct object *obj; /* object owning this name */
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struct object *parent; /* parent object */
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data_size_t len; /* name length in bytes */
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WCHAR name[1];
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};
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struct namespace
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{
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unsigned int hash_size; /* size of hash table */
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struct list names[1]; /* array of hash entry lists */
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};
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#ifdef DEBUG_OBJECTS
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static struct list object_list = LIST_INIT(object_list);
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static struct list static_object_list = LIST_INIT(static_object_list);
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void dump_objects(void)
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{
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struct list *p;
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LIST_FOR_EACH( p, &static_object_list )
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{
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struct object *ptr = LIST_ENTRY( p, struct object, obj_list );
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fprintf( stderr, "%p:%d: ", ptr, ptr->refcount );
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dump_object_name( ptr );
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ptr->ops->dump( ptr, 1 );
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}
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LIST_FOR_EACH( p, &object_list )
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{
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struct object *ptr = LIST_ENTRY( p, struct object, obj_list );
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fprintf( stderr, "%p:%d: ", ptr, ptr->refcount );
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dump_object_name( ptr );
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ptr->ops->dump( ptr, 1 );
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}
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}
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void close_objects(void)
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{
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struct list *ptr;
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/* release the static objects */
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while ((ptr = list_head( &static_object_list )))
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{
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struct object *obj = LIST_ENTRY( ptr, struct object, obj_list );
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/* move it back to the standard list before freeing */
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list_remove( &obj->obj_list );
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list_add_head( &object_list, &obj->obj_list );
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release_object( obj );
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}
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dump_objects(); /* dump any remaining objects */
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}
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#endif /* DEBUG_OBJECTS */
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/*****************************************************************/
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/* malloc replacement */
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void *mem_alloc( size_t size )
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{
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void *ptr = malloc( size );
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if (ptr) memset( ptr, 0x55, size );
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else set_error( STATUS_NO_MEMORY );
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return ptr;
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}
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/* duplicate a block of memory */
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void *memdup( const void *data, size_t len )
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{
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void *ptr = malloc( len );
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if (ptr) memcpy( ptr, data, len );
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else set_error( STATUS_NO_MEMORY );
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return ptr;
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}
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/*****************************************************************/
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static int get_name_hash( const struct namespace *namespace, const WCHAR *name, data_size_t len )
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{
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WCHAR hash = 0;
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len /= sizeof(WCHAR);
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while (len--) hash ^= tolowerW(*name++);
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return hash % namespace->hash_size;
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}
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/* allocate a name for an object */
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static struct object_name *alloc_name( const struct unicode_str *name )
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{
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struct object_name *ptr;
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if ((ptr = mem_alloc( sizeof(*ptr) + name->len - sizeof(ptr->name) )))
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{
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ptr->len = name->len;
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ptr->parent = NULL;
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memcpy( ptr->name, name->str, name->len );
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}
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return ptr;
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}
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/* free the name of an object */
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static void free_name( struct object *obj )
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{
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struct object_name *ptr = obj->name;
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list_remove( &ptr->entry );
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if (ptr->parent) release_object( ptr->parent );
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free( ptr );
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}
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/* set the name of an existing object */
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static void set_object_name( struct namespace *namespace,
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struct object *obj, struct object_name *ptr )
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{
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int hash = get_name_hash( namespace, ptr->name, ptr->len );
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list_add_head( &namespace->names[hash], &ptr->entry );
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ptr->obj = obj;
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obj->name = ptr;
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}
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/* get the name of an existing object */
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const WCHAR *get_object_name( struct object *obj, data_size_t *len )
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{
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struct object_name *ptr = obj->name;
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if (!ptr) return NULL;
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*len = ptr->len;
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return ptr->name;
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}
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/* get the full path name of an existing object */
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WCHAR *get_object_full_name( struct object *obj, data_size_t *ret_len )
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{
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static const WCHAR backslash = '\\';
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struct object *ptr = obj;
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data_size_t len = 0;
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char *ret;
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while (ptr && ptr->name)
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{
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struct object_name *name = ptr->name;
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len += name->len + sizeof(WCHAR);
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ptr = name->parent;
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}
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if (!len) return NULL;
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if (!(ret = malloc( len ))) return NULL;
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*ret_len = len;
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while (obj && obj->name)
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{
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struct object_name *name = obj->name;
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memcpy( ret + len - name->len, name->name, name->len );
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len -= name->len + sizeof(WCHAR);
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memcpy( ret + len, &backslash, sizeof(WCHAR) );
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obj = name->parent;
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}
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return (WCHAR *)ret;
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}
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/* allocate and initialize an object */
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void *alloc_object( const struct object_ops *ops )
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{
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struct object *obj = mem_alloc( ops->size );
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if (obj)
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{
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obj->refcount = 1;
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obj->handle_count = 0;
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obj->ops = ops;
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obj->name = NULL;
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obj->sd = NULL;
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list_init( &obj->wait_queue );
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#ifdef DEBUG_OBJECTS
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list_add_head( &object_list, &obj->obj_list );
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#endif
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return obj;
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}
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return NULL;
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}
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void *create_object( struct namespace *namespace, const struct object_ops *ops,
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const struct unicode_str *name, struct object *parent )
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{
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struct object *obj;
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struct object_name *name_ptr;
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if (!(name_ptr = alloc_name( name ))) return NULL;
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if ((obj = alloc_object( ops )))
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{
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set_object_name( namespace, obj, name_ptr );
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if (parent) name_ptr->parent = grab_object( parent );
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}
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else
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free( name_ptr );
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return obj;
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}
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void *create_named_object( struct namespace *namespace, const struct object_ops *ops,
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const struct unicode_str *name, unsigned int attributes )
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{
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struct object *obj;
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if (!name || !name->len)
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{
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if ((obj = alloc_object( ops ))) clear_error();
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return obj;
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}
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if ((obj = find_object( namespace, name, attributes )))
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{
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if (attributes & OBJ_OPENIF && obj->ops == ops)
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set_error( STATUS_OBJECT_NAME_EXISTS );
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else
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{
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release_object( obj );
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obj = NULL;
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if (attributes & OBJ_OPENIF)
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set_error( STATUS_OBJECT_TYPE_MISMATCH );
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else
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set_error( STATUS_OBJECT_NAME_COLLISION );
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}
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return obj;
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}
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if ((obj = create_object( namespace, ops, name, NULL ))) clear_error();
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return obj;
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}
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/* recursive helper for dump_object_name */
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static void dump_name( struct object *obj )
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{
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struct object_name *name = obj->name;
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if (!name) return;
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if (name->parent) dump_name( name->parent );
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fputs( "\\\\", stderr );
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dump_strW( name->name, name->len / sizeof(WCHAR), stderr, "[]" );
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}
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/* dump the name of an object to stderr */
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void dump_object_name( struct object *obj )
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{
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if (!obj->name) return;
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fputc( '[', stderr );
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dump_name( obj );
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fputs( "] ", stderr );
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}
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/* unlink a named object from its namespace, without freeing the object itself */
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void unlink_named_object( struct object *obj )
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{
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if (obj->name) free_name( obj );
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obj->name = NULL;
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}
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/* mark an object as being stored statically, i.e. only released at shutdown */
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void make_object_static( struct object *obj )
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{
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#ifdef DEBUG_OBJECTS
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list_remove( &obj->obj_list );
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list_add_head( &static_object_list, &obj->obj_list );
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#endif
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}
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/* grab an object (i.e. increment its refcount) and return the object */
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struct object *grab_object( void *ptr )
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{
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struct object *obj = (struct object *)ptr;
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assert( obj->refcount < INT_MAX );
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obj->refcount++;
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return obj;
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}
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/* release an object (i.e. decrement its refcount) */
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void release_object( void *ptr )
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{
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struct object *obj = (struct object *)ptr;
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assert( obj->refcount );
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if (!--obj->refcount)
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{
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assert( !obj->handle_count );
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/* if the refcount is 0, nobody can be in the wait queue */
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assert( list_empty( &obj->wait_queue ));
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obj->ops->destroy( obj );
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if (obj->name) free_name( obj );
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free( obj->sd );
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#ifdef DEBUG_OBJECTS
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list_remove( &obj->obj_list );
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memset( obj, 0xaa, obj->ops->size );
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#endif
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free( obj );
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}
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}
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/* find an object by its name; the refcount is incremented */
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struct object *find_object( const struct namespace *namespace, const struct unicode_str *name,
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unsigned int attributes )
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{
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const struct list *list;
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struct list *p;
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if (!name || !name->len) return NULL;
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list = &namespace->names[ get_name_hash( namespace, name->str, name->len ) ];
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LIST_FOR_EACH( p, list )
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{
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const struct object_name *ptr = LIST_ENTRY( p, struct object_name, entry );
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if (ptr->len != name->len) continue;
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if (attributes & OBJ_CASE_INSENSITIVE)
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{
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if (!strncmpiW( ptr->name, name->str, name->len/sizeof(WCHAR) ))
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return grab_object( ptr->obj );
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}
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else
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{
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if (!memcmp( ptr->name, name->str, name->len ))
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return grab_object( ptr->obj );
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}
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}
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return NULL;
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}
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/* find an object by its index; the refcount is incremented */
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struct object *find_object_index( const struct namespace *namespace, unsigned int index )
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{
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unsigned int i;
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/* FIXME: not efficient at all */
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for (i = 0; i < namespace->hash_size; i++)
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{
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const struct object_name *ptr;
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LIST_FOR_EACH_ENTRY( ptr, &namespace->names[i], const struct object_name, entry )
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{
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if (!index--) return grab_object( ptr->obj );
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}
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}
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set_error( STATUS_NO_MORE_ENTRIES );
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return NULL;
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}
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/* allocate a namespace */
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struct namespace *create_namespace( unsigned int hash_size )
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{
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struct namespace *namespace;
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unsigned int i;
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namespace = mem_alloc( sizeof(*namespace) + (hash_size - 1) * sizeof(namespace->names[0]) );
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if (namespace)
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{
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namespace->hash_size = hash_size;
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for (i = 0; i < hash_size; i++) list_init( &namespace->names[i] );
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}
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return namespace;
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}
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/* functions for unimplemented/default object operations */
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struct object_type *no_get_type( struct object *obj )
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{
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return NULL;
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}
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int no_add_queue( struct object *obj, struct wait_queue_entry *entry )
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{
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set_error( STATUS_OBJECT_TYPE_MISMATCH );
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return 0;
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}
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void no_satisfied( struct object *obj, struct wait_queue_entry *entry )
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{
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}
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int no_signal( struct object *obj, unsigned int access )
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{
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set_error( STATUS_OBJECT_TYPE_MISMATCH );
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return 0;
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}
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struct fd *no_get_fd( struct object *obj )
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{
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set_error( STATUS_OBJECT_TYPE_MISMATCH );
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return NULL;
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}
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unsigned int no_map_access( struct object *obj, unsigned int access )
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{
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if (access & GENERIC_READ) access |= STANDARD_RIGHTS_READ;
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if (access & GENERIC_WRITE) access |= STANDARD_RIGHTS_WRITE;
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if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE;
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if (access & GENERIC_ALL) access |= STANDARD_RIGHTS_ALL;
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return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
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}
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struct security_descriptor *default_get_sd( struct object *obj )
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{
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return obj->sd;
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}
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int set_sd_defaults_from_token( struct object *obj, const struct security_descriptor *sd,
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unsigned int set_info, struct token *token )
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{
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struct security_descriptor new_sd, *new_sd_ptr;
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int present;
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const SID *owner = NULL, *group = NULL;
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const ACL *sacl, *dacl;
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char *ptr;
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if (!set_info) return 1;
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new_sd.control = sd->control & ~SE_SELF_RELATIVE;
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if (set_info & OWNER_SECURITY_INFORMATION && sd->owner_len)
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{
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owner = sd_get_owner( sd );
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new_sd.owner_len = sd->owner_len;
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}
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else if (obj->sd && obj->sd->owner_len)
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{
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owner = sd_get_owner( obj->sd );
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new_sd.owner_len = obj->sd->owner_len;
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}
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else if (token)
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{
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owner = token_get_user( token );
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new_sd.owner_len = security_sid_len( owner );
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}
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else new_sd.owner_len = 0;
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if (set_info & GROUP_SECURITY_INFORMATION && sd->group_len)
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{
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group = sd_get_group( sd );
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new_sd.group_len = sd->group_len;
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}
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else if (obj->sd && obj->sd->group_len)
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{
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group = sd_get_group( obj->sd );
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new_sd.group_len = obj->sd->group_len;
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}
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else if (token)
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{
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group = token_get_primary_group( token );
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new_sd.group_len = security_sid_len( group );
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}
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else new_sd.group_len = 0;
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new_sd.control |= SE_SACL_PRESENT;
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sacl = sd_get_sacl( sd, &present );
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if (set_info & SACL_SECURITY_INFORMATION && present)
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new_sd.sacl_len = sd->sacl_len;
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else
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{
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if (obj->sd) sacl = sd_get_sacl( obj->sd, &present );
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if (obj->sd && present)
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new_sd.sacl_len = obj->sd->sacl_len;
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else
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new_sd.sacl_len = 0;
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}
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new_sd.control |= SE_DACL_PRESENT;
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dacl = sd_get_dacl( sd, &present );
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if (set_info & DACL_SECURITY_INFORMATION && present)
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new_sd.dacl_len = sd->dacl_len;
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else
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{
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if (obj->sd) dacl = sd_get_dacl( obj->sd, &present );
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if (obj->sd && present)
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new_sd.dacl_len = obj->sd->dacl_len;
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else if (token)
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{
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dacl = token_get_default_dacl( token );
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new_sd.dacl_len = dacl->AclSize;
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}
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else new_sd.dacl_len = 0;
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}
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ptr = mem_alloc( sizeof(new_sd) + new_sd.owner_len + new_sd.group_len +
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new_sd.sacl_len + new_sd.dacl_len );
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if (!ptr) return 0;
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new_sd_ptr = (struct security_descriptor*)ptr;
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memcpy( ptr, &new_sd, sizeof(new_sd) );
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ptr += sizeof(new_sd);
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memcpy( ptr, owner, new_sd.owner_len );
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ptr += new_sd.owner_len;
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memcpy( ptr, group, new_sd.group_len );
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ptr += new_sd.group_len;
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memcpy( ptr, sacl, new_sd.sacl_len );
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ptr += new_sd.sacl_len;
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memcpy( ptr, dacl, new_sd.dacl_len );
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|
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free( obj->sd );
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obj->sd = new_sd_ptr;
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return 1;
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}
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|
|
/** Set the security descriptor using the current primary token for defaults. */
|
|
int default_set_sd( struct object *obj, const struct security_descriptor *sd,
|
|
unsigned int set_info )
|
|
{
|
|
return set_sd_defaults_from_token( obj, sd, set_info, current->process->token );
|
|
}
|
|
|
|
struct object *no_lookup_name( struct object *obj, struct unicode_str *name,
|
|
unsigned int attr )
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
struct object *no_open_file( struct object *obj, unsigned int access, unsigned int sharing,
|
|
unsigned int options )
|
|
{
|
|
set_error( STATUS_OBJECT_TYPE_MISMATCH );
|
|
return NULL;
|
|
}
|
|
|
|
int no_close_handle( struct object *obj, struct process *process, obj_handle_t handle )
|
|
{
|
|
return 1; /* ok to close */
|
|
}
|
|
|
|
void no_destroy( struct object *obj )
|
|
{
|
|
}
|