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![Jinoh Kang](/assets/img/avatar_default.png)
\??\GLOBALROOT is a well-known NT symbolic link that allows applications to access the NT object manager's root namespace via Win32 APIs. Signed-off-by: Jinoh Kang <jinoh.kang.kr@gmail.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>
242 lines
7.7 KiB
C
242 lines
7.7 KiB
C
/*
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* Server-side symbolic link object management
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*
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* Copyright (C) 2005 Vitaliy Margolen
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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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*/
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#include "config.h"
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#include <assert.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/types.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 "ddk/wdm.h"
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#include "handle.h"
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#include "request.h"
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#include "object.h"
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#include "unicode.h"
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static const WCHAR symlink_name[] = {'S','y','m','b','o','l','i','c','L','i','n','k'};
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struct type_descr symlink_type =
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{
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{ symlink_name, sizeof(symlink_name) }, /* name */
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SYMBOLIC_LINK_ALL_ACCESS, /* valid_access */
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{ /* mapping */
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STANDARD_RIGHTS_READ | SYMBOLIC_LINK_QUERY,
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STANDARD_RIGHTS_WRITE,
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STANDARD_RIGHTS_EXECUTE | SYMBOLIC_LINK_QUERY,
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SYMBOLIC_LINK_ALL_ACCESS
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},
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};
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struct symlink
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{
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struct object obj; /* object header */
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WCHAR *target; /* target of the symlink */
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data_size_t len; /* target len in bytes */
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};
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static void symlink_dump( struct object *obj, int verbose );
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static struct object *symlink_lookup_name( struct object *obj, struct unicode_str *name,
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unsigned int attr, struct object *root );
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static void symlink_destroy( struct object *obj );
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static const struct object_ops symlink_ops =
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{
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sizeof(struct symlink), /* size */
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&symlink_type, /* type */
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symlink_dump, /* dump */
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no_add_queue, /* add_queue */
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NULL, /* remove_queue */
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NULL, /* signaled */
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NULL, /* satisfied */
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no_signal, /* signal */
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no_get_fd, /* get_fd */
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default_map_access, /* map_access */
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default_get_sd, /* get_sd */
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default_set_sd, /* set_sd */
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default_get_full_name, /* get_full_name */
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symlink_lookup_name, /* lookup_name */
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directory_link_name, /* link_name */
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default_unlink_name, /* unlink_name */
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no_open_file, /* open_file */
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no_kernel_obj_list, /* get_kernel_obj_list */
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no_close_handle, /* close_handle */
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symlink_destroy /* destroy */
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};
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static void symlink_dump( struct object *obj, int verbose )
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{
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struct symlink *symlink = (struct symlink *)obj;
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assert( obj->ops == &symlink_ops );
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fputs( "Symlink target=\"", stderr );
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dump_strW( symlink->target, symlink->len, stderr, "\"\"" );
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fputs( "\"\n", stderr );
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}
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static struct object *symlink_lookup_name( struct object *obj, struct unicode_str *name,
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unsigned int attr, struct object *root )
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{
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struct symlink *symlink = (struct symlink *)obj;
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struct unicode_str target_str, name_left;
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struct object *target;
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assert( obj->ops == &symlink_ops );
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if (!name) return NULL;
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if (!name->len && (attr & OBJ_OPENLINK)) return NULL;
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if (obj == root) return NULL;
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if (!symlink->len) return get_root_directory();
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target_str.str = symlink->target;
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target_str.len = symlink->len;
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if ((target = lookup_named_object( NULL, &target_str, attr, &name_left )))
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{
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if (name_left.len)
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{
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release_object( target );
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target = NULL;
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set_error( STATUS_OBJECT_PATH_NOT_FOUND );
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}
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}
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return target;
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}
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static void symlink_destroy( struct object *obj )
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{
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struct symlink *symlink = (struct symlink *)obj;
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assert( obj->ops == &symlink_ops );
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free( symlink->target );
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}
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struct object *create_root_symlink( struct object *root, const struct unicode_str *name,
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unsigned int attr, const struct security_descriptor *sd )
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{
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struct symlink *symlink;
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if (!(symlink = create_named_object( root, &symlink_ops, name, attr, sd ))) return NULL;
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symlink->target = NULL;
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symlink->len = 0;
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return &symlink->obj;
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}
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struct object *create_symlink( struct object *root, const struct unicode_str *name,
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unsigned int attr, const struct unicode_str *target,
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const struct security_descriptor *sd )
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{
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struct symlink *symlink;
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if (!target->len)
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{
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set_error( STATUS_INVALID_PARAMETER );
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return NULL;
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}
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if (!(symlink = create_named_object( root, &symlink_ops, name, attr, sd ))) return NULL;
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if (get_error() != STATUS_OBJECT_NAME_EXISTS && !(symlink->target = memdup( target->str, target->len )))
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{
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release_object( symlink );
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return NULL;
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}
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symlink->len = target->len;
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return &symlink->obj;
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}
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/* create a symlink pointing to an existing object */
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struct object *create_obj_symlink( struct object *root, const struct unicode_str *name,
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unsigned int attr, struct object *target,
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const struct security_descriptor *sd )
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{
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struct symlink *symlink;
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data_size_t len;
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WCHAR *target_name;
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if (!(target_name = target->ops->get_full_name( target, &len )))
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{
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set_error( STATUS_INVALID_PARAMETER );
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return NULL;
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}
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if ((symlink = create_named_object( root, &symlink_ops, name, attr, sd )) &&
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(get_error() != STATUS_OBJECT_NAME_EXISTS))
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{
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symlink->target = target_name;
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symlink->len = len;
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}
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else free( target_name );
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return &symlink->obj;
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}
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/* create a symbolic link object */
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DECL_HANDLER(create_symlink)
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{
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struct object *symlink;
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struct unicode_str name, target;
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struct object *root;
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const struct security_descriptor *sd;
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const struct object_attributes *objattr = get_req_object_attributes( &sd, &name, &root );
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if (!objattr) return;
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target.str = get_req_data_after_objattr( objattr, &target.len );
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target.len = (target.len / sizeof(WCHAR)) * sizeof(WCHAR);
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if ((symlink = create_symlink( root, &name, objattr->attributes, &target, sd )))
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{
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reply->handle = alloc_handle( current->process, symlink, req->access, objattr->attributes );
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release_object( symlink );
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}
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if (root) release_object( root );
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}
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/* open a symbolic link object */
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DECL_HANDLER(open_symlink)
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{
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struct unicode_str name = get_req_unicode_str();
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reply->handle = open_object( current->process, req->rootdir, req->access,
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&symlink_ops, &name, req->attributes | OBJ_OPENLINK );
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}
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/* query a symbolic link object */
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DECL_HANDLER(query_symlink)
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{
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struct symlink *symlink;
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symlink = (struct symlink *)get_handle_obj( current->process, req->handle,
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SYMBOLIC_LINK_QUERY, &symlink_ops );
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if (!symlink) return;
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reply->total = symlink->len;
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if (get_reply_max_size() < symlink->len)
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set_error( STATUS_BUFFER_TOO_SMALL );
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else
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set_reply_data( symlink->target, symlink->len );
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release_object( symlink );
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}
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