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Sweden-Number/server/object.c

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/*
* Server-side objects
*
* Copyright (C) 1998 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "config.h"
#include "wine/port.h"
#include <assert.h>
#include <limits.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdarg.h>
#ifdef HAVE_VALGRIND_MEMCHECK_H
#include <valgrind/memcheck.h>
#endif
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "winternl.h"
#include "file.h"
#include "process.h"
#include "thread.h"
#include "unicode.h"
#include "security.h"
struct namespace
{
unsigned int hash_size; /* size of hash table */
struct list names[1]; /* array of hash entry lists */
};
#ifdef DEBUG_OBJECTS
static struct list object_list = LIST_INIT(object_list);
static struct list static_object_list = LIST_INIT(static_object_list);
void dump_objects(void)
{
struct list *p;
LIST_FOR_EACH( p, &static_object_list )
{
struct object *ptr = LIST_ENTRY( p, struct object, obj_list );
fprintf( stderr, "%p:%d: ", ptr, ptr->refcount );
dump_object_name( ptr );
ptr->ops->dump( ptr, 1 );
}
LIST_FOR_EACH( p, &object_list )
{
struct object *ptr = LIST_ENTRY( p, struct object, obj_list );
fprintf( stderr, "%p:%d: ", ptr, ptr->refcount );
dump_object_name( ptr );
ptr->ops->dump( ptr, 1 );
}
}
void close_objects(void)
{
struct list *ptr;
/* release the static objects */
while ((ptr = list_head( &static_object_list )))
{
struct object *obj = LIST_ENTRY( ptr, struct object, obj_list );
/* move it back to the standard list before freeing */
list_remove( &obj->obj_list );
list_add_head( &object_list, &obj->obj_list );
release_object( obj );
}
dump_objects(); /* dump any remaining objects */
}
#endif /* DEBUG_OBJECTS */
/*****************************************************************/
/* mark a block of memory as uninitialized for debugging purposes */
static inline void mark_block_uninitialized( void *ptr, size_t size )
{
memset( ptr, 0x55, size );
#if defined(VALGRIND_MAKE_MEM_UNDEFINED)
VALGRIND_DISCARD( VALGRIND_MAKE_MEM_UNDEFINED( ptr, size ));
#elif defined(VALGRIND_MAKE_WRITABLE)
VALGRIND_DISCARD( VALGRIND_MAKE_WRITABLE( ptr, size ));
#endif
}
/* malloc replacement */
void *mem_alloc( size_t size )
{
void *ptr = malloc( size );
if (ptr) mark_block_uninitialized( ptr, size );
else set_error( STATUS_NO_MEMORY );
return ptr;
}
/* duplicate a block of memory */
void *memdup( const void *data, size_t len )
{
void *ptr = malloc( len );
if (ptr) memcpy( ptr, data, len );
else set_error( STATUS_NO_MEMORY );
return ptr;
}
/*****************************************************************/
void namespace_add( struct namespace *namespace, struct object_name *ptr )
{
unsigned int hash = hash_strW( ptr->name, ptr->len, namespace->hash_size );
list_add_head( &namespace->names[hash], &ptr->entry );
}
/* allocate a name for an object */
static struct object_name *alloc_name( const struct unicode_str *name )
{
struct object_name *ptr;
if ((ptr = mem_alloc( sizeof(*ptr) + name->len - sizeof(ptr->name) )))
{
ptr->len = name->len;
ptr->parent = NULL;
memcpy( ptr->name, name->str, name->len );
}
return ptr;
}
/* get the name of an existing object */
const WCHAR *get_object_name( struct object *obj, data_size_t *len )
{
struct object_name *ptr = obj->name;
if (!ptr) return NULL;
*len = ptr->len;
return ptr->name;
}
/* get the full path name of an existing object */
WCHAR *get_object_full_name( struct object *obj, data_size_t *ret_len )
{
static const WCHAR backslash = '\\';
struct object *ptr = obj;
data_size_t len = 0;
char *ret;
while (ptr && ptr->name)
{
struct object_name *name = ptr->name;
len += name->len + sizeof(WCHAR);
ptr = name->parent;
}
if (!len) return NULL;
if (!(ret = malloc( len ))) return NULL;
*ret_len = len;
while (obj && obj->name)
{
struct object_name *name = obj->name;
memcpy( ret + len - name->len, name->name, name->len );
len -= name->len + sizeof(WCHAR);
memcpy( ret + len, &backslash, sizeof(WCHAR) );
obj = name->parent;
}
return (WCHAR *)ret;
}
/* allocate and initialize an object */
void *alloc_object( const struct object_ops *ops )
{
struct object *obj = mem_alloc( ops->size );
if (obj)
{
obj->refcount = 1;
obj->handle_count = 0;
obj->ops = ops;
obj->name = NULL;
obj->sd = NULL;
list_init( &obj->wait_queue );
#ifdef DEBUG_OBJECTS
list_add_head( &object_list, &obj->obj_list );
#endif
return obj;
}
return NULL;
}
/* free an object once it has been destroyed */
static void free_object( struct object *obj )
{
free( obj->sd );
#ifdef DEBUG_OBJECTS
list_remove( &obj->obj_list );
memset( obj, 0xaa, obj->ops->size );
#endif
free( obj );
}
/* find an object by name starting from the specified root */
/* if it doesn't exist, its parent is returned, and name_left contains the remaining name */
struct object *lookup_named_object( struct object *root, const struct unicode_str *name,
unsigned int attr, struct unicode_str *name_left )
{
struct object *obj, *parent;
struct unicode_str name_tmp = *name, *ptr = &name_tmp;
if (root)
{
/* if root is specified path shouldn't start with backslash */
if (name_tmp.len && name_tmp.str[0] == '\\')
{
set_error( STATUS_OBJECT_PATH_SYNTAX_BAD );
return NULL;
}
parent = grab_object( root );
}
else
{
if (!name_tmp.len || name_tmp.str[0] != '\\')
{
set_error( STATUS_OBJECT_PATH_SYNTAX_BAD );
return NULL;
}
/* skip leading backslash */
name_tmp.str++;
name_tmp.len -= sizeof(WCHAR);
parent = get_root_directory();
}
if (!name_tmp.len) ptr = NULL; /* special case for empty path */
clear_error();
while ((obj = parent->ops->lookup_name( parent, ptr, attr )))
{
/* move to the next element */
release_object ( parent );
parent = obj;
}
if (get_error())
{
release_object( parent );
return NULL;
}
if (name_left) *name_left = name_tmp;
return parent;
}
/* return length of first path element in name */
data_size_t get_path_element( const WCHAR *name, data_size_t len )
{
data_size_t i;
for (i = 0; i < len / sizeof(WCHAR); i++) if (name[i] == '\\') break;
return i * sizeof(WCHAR);
}
static struct object *create_object( struct object *parent, const struct object_ops *ops,
const struct unicode_str *name, unsigned int attributes,
const struct security_descriptor *sd )
{
struct object *obj;
struct object_name *name_ptr;
if (!(name_ptr = alloc_name( name ))) return NULL;
if (!(obj = alloc_object( ops ))) goto failed;
if (sd && !default_set_sd( obj, sd, OWNER_SECURITY_INFORMATION | GROUP_SECURITY_INFORMATION |
DACL_SECURITY_INFORMATION | SACL_SECURITY_INFORMATION ))
goto failed;
if (!obj->ops->link_name( obj, name_ptr, parent )) goto failed;
name_ptr->obj = obj;
obj->name = name_ptr;
if (attributes & OBJ_PERMANENT)
{
make_object_static( obj );
grab_object( obj );
}
return obj;
failed:
if (obj) free_object( obj );
free( name_ptr );
return NULL;
}
/* create an object as named child under the specified parent */
void *create_named_object( struct object *parent, const struct object_ops *ops,
const struct unicode_str *name, unsigned int attributes,
const struct security_descriptor *sd )
{
struct object *obj, *new_obj;
struct unicode_str new_name;
clear_error();
if (!name || !name->len)
{
if (!(new_obj = alloc_object( ops ))) return NULL;
if (sd && !default_set_sd( new_obj, sd, OWNER_SECURITY_INFORMATION | GROUP_SECURITY_INFORMATION |
DACL_SECURITY_INFORMATION | SACL_SECURITY_INFORMATION ))
{
free_object( new_obj );
return NULL;
}
return new_obj;
}
if (!(obj = lookup_named_object( parent, name, attributes, &new_name ))) return NULL;
if (!new_name.len)
{
if (attributes & OBJ_OPENIF && obj->ops == ops)
set_error( STATUS_OBJECT_NAME_EXISTS );
else
{
release_object( obj );
obj = NULL;
if (attributes & OBJ_OPENIF)
set_error( STATUS_OBJECT_TYPE_MISMATCH );
else
set_error( STATUS_OBJECT_NAME_COLLISION );
}
return obj;
}
new_obj = create_object( obj, ops, &new_name, attributes, sd );
release_object( obj );
return new_obj;
}
/* open a object by name under the specified parent */
void *open_named_object( struct object *parent, const struct object_ops *ops,
const struct unicode_str *name, unsigned int attributes )
{
struct unicode_str name_left;
struct object *obj;
if ((obj = lookup_named_object( parent, name, attributes, &name_left )))
{
if (name_left.len) /* not fully parsed */
set_error( STATUS_OBJECT_NAME_NOT_FOUND );
else if (ops && obj->ops != ops)
set_error( STATUS_OBJECT_TYPE_MISMATCH );
else
return obj;
release_object( obj );
}
return NULL;
}
/* recursive helper for dump_object_name */
static void dump_name( struct object *obj )
{
struct object_name *name = obj->name;
if (!name) return;
if (name->parent) dump_name( name->parent );
fputs( "\\\\", stderr );
dump_strW( name->name, name->len, stderr, "[]" );
}
/* dump the name of an object to stderr */
void dump_object_name( struct object *obj )
{
if (!obj->name) return;
fputc( '[', stderr );
dump_name( obj );
fputs( "] ", stderr );
}
/* unlink a named object from its namespace, without freeing the object itself */
void unlink_named_object( struct object *obj )
{
struct object_name *name_ptr = obj->name;
if (!name_ptr) return;
obj->name = NULL;
obj->ops->unlink_name( obj, name_ptr );
if (name_ptr->parent) release_object( name_ptr->parent );
free( name_ptr );
}
/* mark an object as being stored statically, i.e. only released at shutdown */
void make_object_static( struct object *obj )
{
obj->is_permanent = 1;
#ifdef DEBUG_OBJECTS
list_remove( &obj->obj_list );
list_add_head( &static_object_list, &obj->obj_list );
#endif
}
/* mark an object as no longer static */
void make_object_temporary( struct object *obj )
{
obj->is_permanent = 0;
#ifdef DEBUG_OBJECTS
list_remove( &obj->obj_list );
list_add_head( &object_list, &obj->obj_list );
#endif
}
/* grab an object (i.e. increment its refcount) and return the object */
struct object *grab_object( void *ptr )
{
struct object *obj = (struct object *)ptr;
assert( obj->refcount < INT_MAX );
obj->refcount++;
return obj;
}
/* release an object (i.e. decrement its refcount) */
void release_object( void *ptr )
{
struct object *obj = (struct object *)ptr;
assert( obj->refcount );
if (!--obj->refcount)
{
assert( !obj->handle_count );
/* if the refcount is 0, nobody can be in the wait queue */
assert( list_empty( &obj->wait_queue ));
free_kernel_objects( obj );
unlink_named_object( obj );
obj->ops->destroy( obj );
free_object( obj );
}
}
/* find an object by its name; the refcount is incremented */
struct object *find_object( const struct namespace *namespace, const struct unicode_str *name,
unsigned int attributes )
{
const struct list *list;
struct list *p;
if (!name || !name->len) return NULL;
list = &namespace->names[ hash_strW( name->str, name->len, namespace->hash_size ) ];
LIST_FOR_EACH( p, list )
{
const struct object_name *ptr = LIST_ENTRY( p, struct object_name, entry );
if (ptr->len != name->len) continue;
if (attributes & OBJ_CASE_INSENSITIVE)
{
if (!memicmp_strW( ptr->name, name->str, name->len ))
return grab_object( ptr->obj );
}
else
{
if (!memcmp( ptr->name, name->str, name->len ))
return grab_object( ptr->obj );
}
}
return NULL;
}
/* find an object by its index; the refcount is incremented */
struct object *find_object_index( const struct namespace *namespace, unsigned int index )
{
unsigned int i;
/* FIXME: not efficient at all */
for (i = 0; i < namespace->hash_size; i++)
{
const struct object_name *ptr;
LIST_FOR_EACH_ENTRY( ptr, &namespace->names[i], const struct object_name, entry )
{
if (!index--) return grab_object( ptr->obj );
}
}
set_error( STATUS_NO_MORE_ENTRIES );
return NULL;
}
/* allocate a namespace */
struct namespace *create_namespace( unsigned int hash_size )
{
struct namespace *namespace;
unsigned int i;
namespace = mem_alloc( sizeof(*namespace) + (hash_size - 1) * sizeof(namespace->names[0]) );
if (namespace)
{
namespace->hash_size = hash_size;
for (i = 0; i < hash_size; i++) list_init( &namespace->names[i] );
}
return namespace;
}
/* functions for unimplemented/default object operations */
struct object_type *no_get_type( struct object *obj )
{
return NULL;
}
int no_add_queue( struct object *obj, struct wait_queue_entry *entry )
{
set_error( STATUS_OBJECT_TYPE_MISMATCH );
return 0;
}
void no_satisfied( struct object *obj, struct wait_queue_entry *entry )
{
}
int no_signal( struct object *obj, unsigned int access )
{
set_error( STATUS_OBJECT_TYPE_MISMATCH );
return 0;
}
struct fd *no_get_fd( struct object *obj )
{
set_error( STATUS_OBJECT_TYPE_MISMATCH );
return NULL;
}
unsigned int no_map_access( struct object *obj, unsigned int access )
{
if (access & GENERIC_READ) access |= STANDARD_RIGHTS_READ;
if (access & GENERIC_WRITE) access |= STANDARD_RIGHTS_WRITE;
if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE;
if (access & GENERIC_ALL) access |= STANDARD_RIGHTS_ALL;
return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
}
struct security_descriptor *default_get_sd( struct object *obj )
{
return obj->sd;
}
int set_sd_defaults_from_token( struct object *obj, const struct security_descriptor *sd,
unsigned int set_info, struct token *token )
{
struct security_descriptor new_sd, *new_sd_ptr;
int present;
const SID *owner = NULL, *group = NULL;
const ACL *sacl, *dacl;
ACL *replaced_sacl = NULL;
char *ptr;
if (!set_info) return 1;
new_sd.control = sd->control & ~SE_SELF_RELATIVE;
if (set_info & OWNER_SECURITY_INFORMATION && sd->owner_len)
{
owner = sd_get_owner( sd );
new_sd.owner_len = sd->owner_len;
}
else if (obj->sd && obj->sd->owner_len)
{
owner = sd_get_owner( obj->sd );
new_sd.owner_len = obj->sd->owner_len;
}
else if (token)
{
owner = token_get_user( token );
new_sd.owner_len = security_sid_len( owner );
}
else new_sd.owner_len = 0;
if (set_info & GROUP_SECURITY_INFORMATION && sd->group_len)
{
group = sd_get_group( sd );
new_sd.group_len = sd->group_len;
}
else if (obj->sd && obj->sd->group_len)
{
group = sd_get_group( obj->sd );
new_sd.group_len = obj->sd->group_len;
}
else if (token)
{
group = token_get_primary_group( token );
new_sd.group_len = security_sid_len( group );
}
else new_sd.group_len = 0;
sacl = sd_get_sacl( sd, &present );
if (set_info & SACL_SECURITY_INFORMATION && present)
{
new_sd.control |= SE_SACL_PRESENT;
new_sd.sacl_len = sd->sacl_len;
}
else if (set_info & LABEL_SECURITY_INFORMATION && present)
{
const ACL *old_sacl = NULL;
if (obj->sd && obj->sd->control & SE_SACL_PRESENT) old_sacl = sd_get_sacl( obj->sd, &present );
if (!(replaced_sacl = replace_security_labels( old_sacl, sacl ))) return 0;
new_sd.control |= SE_SACL_PRESENT;
new_sd.sacl_len = replaced_sacl->AclSize;
sacl = replaced_sacl;
}
else
{
if (obj->sd) sacl = sd_get_sacl( obj->sd, &present );
if (obj->sd && present)
{
new_sd.control |= SE_SACL_PRESENT;
new_sd.sacl_len = obj->sd->sacl_len;
}
else
new_sd.sacl_len = 0;
}
dacl = sd_get_dacl( sd, &present );
if (set_info & DACL_SECURITY_INFORMATION && present)
{
new_sd.control |= SE_DACL_PRESENT;
new_sd.dacl_len = sd->dacl_len;
}
else
{
if (obj->sd) dacl = sd_get_dacl( obj->sd, &present );
if (obj->sd && present)
{
new_sd.control |= SE_DACL_PRESENT;
new_sd.dacl_len = obj->sd->dacl_len;
}
else if (token)
{
dacl = token_get_default_dacl( token );
new_sd.control |= SE_DACL_PRESENT;
new_sd.dacl_len = dacl->AclSize;
}
else new_sd.dacl_len = 0;
}
ptr = mem_alloc( sizeof(new_sd) + new_sd.owner_len + new_sd.group_len +
new_sd.sacl_len + new_sd.dacl_len );
if (!ptr)
{
free( replaced_sacl );
return 0;
}
new_sd_ptr = (struct security_descriptor*)ptr;
memcpy( ptr, &new_sd, sizeof(new_sd) );
ptr += sizeof(new_sd);
memcpy( ptr, owner, new_sd.owner_len );
ptr += new_sd.owner_len;
memcpy( ptr, group, new_sd.group_len );
ptr += new_sd.group_len;
memcpy( ptr, sacl, new_sd.sacl_len );
ptr += new_sd.sacl_len;
memcpy( ptr, dacl, new_sd.dacl_len );
free( replaced_sacl );
free( obj->sd );
obj->sd = new_sd_ptr;
return 1;
}
/** 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 )
{
if (!name) set_error( STATUS_OBJECT_TYPE_MISMATCH );
return NULL;
}
int no_link_name( struct object *obj, struct object_name *name, struct object *parent )
{
set_error( STATUS_OBJECT_TYPE_MISMATCH );
return 0;
}
void default_unlink_name( struct object *obj, struct object_name *name )
{
list_remove( &name->entry );
}
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 )
{
}
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