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Sweden-Number/server/file.c

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/*
* Server-side file management
*
* 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 <assert.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#ifdef HAVE_UTIME_H
#include <utime.h>
#endif
#include <poll.h>
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "winternl.h"
#include "file.h"
#include "handle.h"
#include "thread.h"
#include "request.h"
#include "process.h"
#include "security.h"
static const WCHAR file_name[] = {'F','i','l','e'};
struct type_descr file_type =
{
{ file_name, sizeof(file_name) }, /* name */
FILE_ALL_ACCESS, /* valid_access */
{ /* mapping */
FILE_GENERIC_READ,
FILE_GENERIC_WRITE,
FILE_GENERIC_EXECUTE,
FILE_ALL_ACCESS
},
};
struct file
{
struct object obj; /* object header */
struct fd *fd; /* file descriptor for this file */
unsigned int access; /* file access (FILE_READ_DATA etc.) */
mode_t mode; /* file stat.st_mode */
uid_t uid; /* file stat.st_uid */
struct list kernel_object; /* list of kernel object pointers */
};
static void file_dump( struct object *obj, int verbose );
static struct fd *file_get_fd( struct object *obj );
static struct security_descriptor *file_get_sd( struct object *obj );
static int file_set_sd( struct object *obj, const struct security_descriptor *sd, unsigned int set_info );
static struct object *file_lookup_name( struct object *obj, struct unicode_str *name,
unsigned int attr, struct object *root );
static struct object *file_open_file( struct object *obj, unsigned int access,
unsigned int sharing, unsigned int options );
static struct list *file_get_kernel_obj_list( struct object *obj );
static void file_destroy( struct object *obj );
static enum server_fd_type file_get_fd_type( struct fd *fd );
static const struct object_ops file_ops =
{
sizeof(struct file), /* size */
&file_type, /* type */
file_dump, /* dump */
add_queue, /* add_queue */
remove_queue, /* remove_queue */
default_fd_signaled, /* signaled */
no_satisfied, /* satisfied */
no_signal, /* signal */
file_get_fd, /* get_fd */
default_map_access, /* map_access */
file_get_sd, /* get_sd */
file_set_sd, /* set_sd */
no_get_full_name, /* get_full_name */
file_lookup_name, /* lookup_name */
no_link_name, /* link_name */
NULL, /* unlink_name */
file_open_file, /* open_file */
file_get_kernel_obj_list, /* get_kernel_obj_list */
no_close_handle, /* close_handle */
file_destroy /* destroy */
};
static const struct fd_ops file_fd_ops =
{
default_fd_get_poll_events, /* get_poll_events */
default_poll_event, /* poll_event */
file_get_fd_type, /* get_fd_type */
no_fd_read, /* read */
no_fd_write, /* write */
no_fd_flush, /* flush */
default_fd_get_file_info, /* get_file_info */
no_fd_get_volume_info, /* get_volume_info */
default_fd_ioctl, /* ioctl */
default_fd_cancel_async, /* cancel_async */
default_fd_queue_async, /* queue_async */
default_fd_reselect_async /* reselect_async */
};
/* create a file from a file descriptor */
/* if the function fails the fd is closed */
struct file *create_file_for_fd( int fd, unsigned int access, unsigned int sharing )
{
struct file *file;
struct stat st;
if (fstat( fd, &st ) == -1)
{
file_set_error();
close( fd );
return NULL;
}
if (!(file = alloc_object( &file_ops )))
{
close( fd );
return NULL;
}
file->mode = st.st_mode;
file->access = default_map_access( &file->obj, access );
list_init( &file->kernel_object );
if (!(file->fd = create_anonymous_fd( &file_fd_ops, fd, &file->obj,
FILE_SYNCHRONOUS_IO_NONALERT )))
{
release_object( file );
return NULL;
}
allow_fd_caching( file->fd );
return file;
}
/* create a file by duplicating an fd object */
struct file *create_file_for_fd_obj( struct fd *fd, unsigned int access, unsigned int sharing )
{
struct file *file;
struct stat st;
if (fstat( get_unix_fd(fd), &st ) == -1)
{
file_set_error();
return NULL;
}
if ((file = alloc_object( &file_ops )))
{
file->mode = st.st_mode;
file->access = default_map_access( &file->obj, access );
list_init( &file->kernel_object );
if (!(file->fd = dup_fd_object( fd, access, sharing, FILE_SYNCHRONOUS_IO_NONALERT )))
{
release_object( file );
return NULL;
}
set_fd_user( file->fd, &file_fd_ops, &file->obj );
}
return file;
}
static struct object *create_file_obj( struct fd *fd, unsigned int access, mode_t mode )
{
struct file *file = alloc_object( &file_ops );
if (!file) return NULL;
file->access = access;
file->mode = mode;
file->uid = ~(uid_t)0;
file->fd = fd;
list_init( &file->kernel_object );
grab_object( fd );
set_fd_user( fd, &file_fd_ops, &file->obj );
return &file->obj;
}
int is_file_executable( const char *name )
{
int len = strlen( name );
return len >= 4 && (!strcasecmp( name + len - 4, ".exe") || !strcasecmp( name + len - 4, ".com" ));
}
static struct object *create_file( struct fd *root, const char *nameptr, data_size_t len,
struct unicode_str nt_name,
unsigned int access, unsigned int sharing, int create,
unsigned int options, unsigned int attrs,
const struct security_descriptor *sd )
{
struct object *obj = NULL;
struct fd *fd;
int flags;
char *name;
mode_t mode;
if (!len || ((nameptr[0] == '/') ^ !root) || (nt_name.len && ((nt_name.str[0] == '\\') ^ !root)))
{
set_error( STATUS_OBJECT_PATH_SYNTAX_BAD );
return NULL;
}
if (!(name = mem_alloc( len + 1 ))) return NULL;
memcpy( name, nameptr, len );
name[len] = 0;
switch(create)
{
case FILE_CREATE: flags = O_CREAT | O_EXCL; break;
case FILE_OVERWRITE_IF: /* FIXME: the difference is whether we trash existing attr or not */
access |= FILE_WRITE_ATTRIBUTES;
case FILE_SUPERSEDE: flags = O_CREAT | O_TRUNC; break;
case FILE_OPEN: flags = 0; break;
case FILE_OPEN_IF: flags = O_CREAT; break;
case FILE_OVERWRITE: flags = O_TRUNC;
access |= FILE_WRITE_ATTRIBUTES; break;
default: set_error( STATUS_INVALID_PARAMETER ); goto done;
}
if (sd)
{
const struct sid *owner = sd_get_owner( sd );
if (!owner)
owner = token_get_user( current->process->token );
mode = sd_to_mode( sd, owner );
}
else if (options & FILE_DIRECTORY_FILE)
mode = (attrs & FILE_ATTRIBUTE_READONLY) ? 0555 : 0777;
else
mode = (attrs & FILE_ATTRIBUTE_READONLY) ? 0444 : 0666;
if (is_file_executable( name ))
{
if (mode & S_IRUSR)
mode |= S_IXUSR;
if (mode & S_IRGRP)
mode |= S_IXGRP;
if (mode & S_IROTH)
mode |= S_IXOTH;
}
access = map_access( access, &file_type.mapping );
/* FIXME: should set error to STATUS_OBJECT_NAME_COLLISION if file existed before */
fd = open_fd( root, name, nt_name, flags | O_NONBLOCK, &mode, access, sharing, options );
if (!fd) goto done;
if (S_ISDIR(mode))
obj = create_dir_obj( fd, access, mode );
else if (S_ISCHR(mode) && is_serial_fd( fd ))
obj = create_serial( fd );
else
obj = create_file_obj( fd, access, mode );
release_object( fd );
done:
free( name );
return obj;
}
static void file_dump( struct object *obj, int verbose )
{
struct file *file = (struct file *)obj;
assert( obj->ops == &file_ops );
fprintf( stderr, "File fd=%p\n", file->fd );
}
static enum server_fd_type file_get_fd_type( struct fd *fd )
{
struct file *file = get_fd_user( fd );
if (S_ISREG(file->mode) || S_ISBLK(file->mode)) return FD_TYPE_FILE;
if (S_ISDIR(file->mode)) return FD_TYPE_DIR;
return FD_TYPE_CHAR;
}
static struct fd *file_get_fd( struct object *obj )
{
struct file *file = (struct file *)obj;
assert( obj->ops == &file_ops );
return (struct fd *)grab_object( file->fd );
}
struct security_descriptor *mode_to_sd( mode_t mode, const struct sid *user, const struct sid *group )
{
struct security_descriptor *sd;
unsigned char flags;
size_t dacl_size;
struct ace *ace;
struct acl *dacl;
char *ptr;
dacl_size = sizeof(*dacl) + sizeof(*ace) + sid_len( &local_system_sid );
if (mode & S_IRWXU) dacl_size += sizeof(*ace) + sid_len( user );
if ((!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) ||
(!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) ||
(!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH))))
dacl_size += sizeof(*ace) + sid_len( user );
if (mode & S_IRWXO) dacl_size += sizeof(*ace) + sid_len( &world_sid );
sd = mem_alloc( sizeof(*sd) + sid_len( user ) + sid_len( group ) + dacl_size );
if (!sd) return sd;
sd->control = SE_DACL_PRESENT;
sd->owner_len = sid_len( user );
sd->group_len = sid_len( group );
sd->sacl_len = 0;
sd->dacl_len = dacl_size;
ptr = (char *)(sd + 1);
memcpy( ptr, user, sd->owner_len );
ptr += sd->owner_len;
memcpy( ptr, group, sd->group_len );
ptr += sd->group_len;
dacl = (struct acl *)ptr;
dacl->revision = ACL_REVISION;
dacl->pad1 = 0;
dacl->size = dacl_size;
dacl->count = 1;
dacl->pad2 = 0;
if (mode & S_IRWXU) dacl->count++;
if ((!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) ||
(!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) ||
(!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH))))
dacl->count++;
if (mode & S_IRWXO) dacl->count++;
flags = (mode & S_IFDIR) ? OBJECT_INHERIT_ACE | CONTAINER_INHERIT_ACE : 0;
/* always give FILE_ALL_ACCESS for Local System */
ace = set_ace( (struct ace *)(dacl + 1), &local_system_sid,
ACCESS_ALLOWED_ACE_TYPE, flags, FILE_ALL_ACCESS );
if (mode & S_IRWXU)
{
/* appropriate access rights for the user */
ace = set_ace( ace_next( ace ), user, ACCESS_ALLOWED_ACE_TYPE, flags, WRITE_DAC | WRITE_OWNER );
if (mode & S_IRUSR) ace->mask |= FILE_GENERIC_READ | FILE_GENERIC_EXECUTE;
if (mode & S_IWUSR) ace->mask |= FILE_GENERIC_WRITE | DELETE | FILE_DELETE_CHILD;
}
if ((!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) ||
(!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) ||
(!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH))))
{
/* deny just in case the user is a member of the group */
ace = set_ace( ace_next( ace ), user, ACCESS_DENIED_ACE_TYPE, flags, 0 );
if (!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH)))
ace->mask |= FILE_GENERIC_READ | FILE_GENERIC_EXECUTE;
if (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IROTH)))
ace->mask |= FILE_GENERIC_WRITE | DELETE | FILE_DELETE_CHILD;
ace->mask &= ~STANDARD_RIGHTS_ALL; /* never deny standard rights */
}
if (mode & S_IRWXO)
{
/* appropriate access rights for Everyone */
ace = set_ace( ace_next( ace ), &world_sid, ACCESS_ALLOWED_ACE_TYPE, flags, 0 );
if (mode & S_IROTH) ace->mask |= FILE_GENERIC_READ | FILE_GENERIC_EXECUTE;
if (mode & S_IWOTH) ace->mask |= FILE_GENERIC_WRITE | DELETE | FILE_DELETE_CHILD;
}
return sd;
}
static struct security_descriptor *file_get_sd( struct object *obj )
{
struct file *file = (struct file *)obj;
struct stat st;
int unix_fd;
struct security_descriptor *sd;
assert( obj->ops == &file_ops );
unix_fd = get_file_unix_fd( file );
if (unix_fd == -1 || fstat( unix_fd, &st ) == -1)
return obj->sd;
/* mode and uid the same? if so, no need to re-generate security descriptor */
if (obj->sd && (st.st_mode & (S_IRWXU|S_IRWXO)) == (file->mode & (S_IRWXU|S_IRWXO)) &&
(st.st_uid == file->uid))
return obj->sd;
sd = mode_to_sd( st.st_mode,
security_unix_uid_to_sid( st.st_uid ),
token_get_primary_group( current->process->token ));
if (!sd) return obj->sd;
file->mode = st.st_mode;
file->uid = st.st_uid;
free( obj->sd );
obj->sd = sd;
return sd;
}
static mode_t file_access_to_mode( unsigned int access )
{
mode_t mode = 0;
access = map_access( access, &file_type.mapping );
if (access & FILE_READ_DATA) mode |= 4;
if (access & (FILE_WRITE_DATA|FILE_APPEND_DATA)) mode |= 2;
if (access & FILE_EXECUTE) mode |= 1;
return mode;
}
mode_t sd_to_mode( const struct security_descriptor *sd, const struct sid *owner )
{
mode_t new_mode = 0;
mode_t bits_to_set = ~0;
mode_t mode;
int present;
const struct acl *dacl = sd_get_dacl( sd, &present );
if (present && dacl)
{
const struct ace *ace = (const struct ace *)(dacl + 1);
unsigned int i;
for (i = 0; i < dacl->count; i++, ace = ace_next( ace ))
{
const struct sid *sid = (const struct sid *)(ace + 1);
if (ace->flags & INHERIT_ONLY_ACE) continue;
mode = file_access_to_mode( ace->mask );
switch (ace->type)
{
case ACCESS_DENIED_ACE_TYPE:
if (equal_sid( sid, &world_sid ))
{
bits_to_set &= ~((mode << 6) | (mode << 3) | mode); /* all */
}
else if (token_sid_present( current->process->token, owner, TRUE ) &&
token_sid_present( current->process->token, sid, TRUE ))
{
bits_to_set &= ~((mode << 6) | (mode << 3)); /* user + group */
}
else if (equal_sid( sid, owner ))
{
bits_to_set &= ~(mode << 6); /* user only */
}
break;
case ACCESS_ALLOWED_ACE_TYPE:
if (equal_sid( sid, &world_sid ))
{
mode = (mode << 6) | (mode << 3) | mode; /* all */
new_mode |= mode & bits_to_set;
bits_to_set &= ~mode;
}
else if (token_sid_present( current->process->token, owner, FALSE ) &&
token_sid_present( current->process->token, sid, FALSE ))
{
mode = (mode << 6) | (mode << 3); /* user + group */
new_mode |= mode & bits_to_set;
bits_to_set &= ~mode;
}
else if (equal_sid( sid, owner ))
{
mode = (mode << 6); /* user only */
new_mode |= mode & bits_to_set;
bits_to_set &= ~mode;
}
break;
}
}
}
else
/* no ACL means full access rights to anyone */
new_mode = S_IRWXU | S_IRWXG | S_IRWXO;
return new_mode;
}
static int file_set_sd( struct object *obj, const struct security_descriptor *sd,
unsigned int set_info )
{
struct file *file = (struct file *)obj;
const struct sid *owner;
struct stat st;
mode_t mode;
int unix_fd;
assert( obj->ops == &file_ops );
unix_fd = get_file_unix_fd( file );
if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 1;
if (set_info & OWNER_SECURITY_INFORMATION)
{
owner = sd_get_owner( sd );
if (!owner)
{
set_error( STATUS_INVALID_SECURITY_DESCR );
return 0;
}
if (!obj->sd || !equal_sid( owner, sd_get_owner( obj->sd ) ))
{
/* FIXME: get Unix uid and call fchown */
}
}
else if (obj->sd)
owner = sd_get_owner( obj->sd );
else
owner = token_get_user( current->process->token );
/* group and sacl not supported */
if (set_info & DACL_SECURITY_INFORMATION)
{
/* keep the bits that we don't map to access rights in the ACL */
mode = st.st_mode & (S_ISUID|S_ISGID|S_ISVTX);
mode |= sd_to_mode( sd, owner );
if (((st.st_mode ^ mode) & (S_IRWXU|S_IRWXG|S_IRWXO)) && fchmod( unix_fd, mode ) == -1)
{
file_set_error();
return 0;
}
}
return 1;
}
static struct object *file_lookup_name( struct object *obj, struct unicode_str *name,
unsigned int attr, struct object *root )
{
if (!name || !name->len) return NULL; /* open the file itself */
set_error( STATUS_OBJECT_PATH_NOT_FOUND );
return NULL;
}
static struct object *file_open_file( struct object *obj, unsigned int access,
unsigned int sharing, unsigned int options )
{
struct file *file = (struct file *)obj;
struct object *new_file = NULL;
struct unicode_str nt_name;
char *unix_name;
assert( obj->ops == &file_ops );
if ((unix_name = dup_fd_name( file->fd, "" )))
{
get_nt_name( file->fd, &nt_name );
new_file = create_file( NULL, unix_name, strlen(unix_name), nt_name, access,
sharing, FILE_OPEN, options, 0, NULL );
free( unix_name );
}
else set_error( STATUS_OBJECT_TYPE_MISMATCH );
return new_file;
}
static struct list *file_get_kernel_obj_list( struct object *obj )
{
struct file *file = (struct file *)obj;
return &file->kernel_object;
}
static void file_destroy( struct object *obj )
{
struct file *file = (struct file *)obj;
assert( obj->ops == &file_ops );
if (file->fd) release_object( file->fd );
}
/* set the last error depending on errno */
void file_set_error(void)
{
switch (errno)
{
case ETXTBSY:
case EAGAIN: set_error( STATUS_SHARING_VIOLATION ); break;
case EBADF: set_error( STATUS_INVALID_HANDLE ); break;
case ENOSPC: set_error( STATUS_DISK_FULL ); break;
case EACCES:
case ESRCH:
case EROFS:
case EPERM: set_error( STATUS_ACCESS_DENIED ); break;
case EBUSY: set_error( STATUS_FILE_LOCK_CONFLICT ); break;
case ENOENT: set_error( STATUS_NO_SUCH_FILE ); break;
case EISDIR: set_error( STATUS_FILE_IS_A_DIRECTORY ); break;
case ENFILE:
case EMFILE: set_error( STATUS_TOO_MANY_OPENED_FILES ); break;
case EEXIST: set_error( STATUS_OBJECT_NAME_COLLISION ); break;
case EINVAL: set_error( STATUS_INVALID_PARAMETER ); break;
case ESPIPE: set_error( STATUS_ILLEGAL_FUNCTION ); break;
case ENOTEMPTY: set_error( STATUS_DIRECTORY_NOT_EMPTY ); break;
case EIO: set_error( STATUS_ACCESS_VIOLATION ); break;
case ENOTDIR: set_error( STATUS_NOT_A_DIRECTORY ); break;
case EFBIG: set_error( STATUS_SECTION_TOO_BIG ); break;
case ENODEV: set_error( STATUS_NO_SUCH_DEVICE ); break;
case ENXIO: set_error( STATUS_NO_SUCH_DEVICE ); break;
case EXDEV: set_error( STATUS_NOT_SAME_DEVICE ); break;
case ELOOP: set_error( STATUS_REPARSE_POINT_NOT_RESOLVED ); break;
#ifdef EOVERFLOW
case EOVERFLOW: set_error( STATUS_INVALID_PARAMETER ); break;
#endif
default:
perror("wineserver: file_set_error() can't map error");
set_error( STATUS_UNSUCCESSFUL );
break;
}
}
struct file *get_file_obj( struct process *process, obj_handle_t handle, unsigned int access )
{
return (struct file *)get_handle_obj( process, handle, access, &file_ops );
}
int get_file_unix_fd( struct file *file )
{
return get_unix_fd( file->fd );
}
/* create a file */
DECL_HANDLER(create_file)
{
struct object *file;
struct fd *root_fd = NULL;
struct unicode_str nt_name;
const struct security_descriptor *sd;
const struct object_attributes *objattr = get_req_object_attributes( &sd, &nt_name, NULL );
const char *name;
data_size_t name_len;
if (!objattr) return;
if (objattr->rootdir)
{
struct dir *root;
if (!(root = get_dir_obj( current->process, objattr->rootdir, 0 ))) return;
root_fd = get_obj_fd( (struct object *)root );
release_object( root );
if (!root_fd) return;
}
name = get_req_data_after_objattr( objattr, &name_len );
reply->handle = 0;
if ((file = create_file( root_fd, name, name_len, nt_name, req->access, req->sharing,
req->create, req->options, req->attrs, sd )))
{
reply->handle = alloc_handle( current->process, file, req->access, objattr->attributes );
release_object( file );
}
if (root_fd) release_object( root_fd );
}
/* allocate a file handle for a Unix fd */
DECL_HANDLER(alloc_file_handle)
{
struct file *file;
int fd;
reply->handle = 0;
if ((fd = thread_get_inflight_fd( current, req->fd )) == -1)
{
set_error( STATUS_INVALID_HANDLE );
return;
}
if ((file = create_file_for_fd( fd, req->access, FILE_SHARE_READ | FILE_SHARE_WRITE )))
{
reply->handle = alloc_handle( current->process, file, req->access, req->attributes );
release_object( file );
}
}
/* lock a region of a file */
DECL_HANDLER(lock_file)
{
struct file *file;
if ((file = get_file_obj( current->process, req->handle, 0 )))
{
reply->handle = lock_fd( file->fd, req->offset, req->count, req->shared, req->wait );
reply->overlapped = is_fd_overlapped( file->fd );
release_object( file );
}
}
/* unlock a region of a file */
DECL_HANDLER(unlock_file)
{
struct file *file;
if ((file = get_file_obj( current->process, req->handle, 0 )))
{
unlock_fd( file->fd, req->offset, req->count );
release_object( file );
}
}
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