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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 "wine/port.h"
#include <assert.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#ifdef HAVE_SYS_ERRNO_H
#include <sys/errno.h>
#endif
#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
#ifdef HAVE_POLL_H
#include <poll.h>
#endif
#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"
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 */
};
static unsigned int generic_file_map_access( unsigned int access );
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 void file_destroy( struct object *obj );
static int file_get_poll_events( struct fd *fd );
static void file_flush( struct fd *fd, struct event **event );
static enum server_fd_type file_get_fd_type( struct fd *fd );
static mode_t sd_to_mode( const struct security_descriptor *sd, const SID *owner );
static const struct object_ops file_ops =
{
sizeof(struct file), /* size */
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_fd_map_access, /* map_access */
file_get_sd, /* get_sd */
file_set_sd, /* set_sd */
no_lookup_name, /* lookup_name */
no_open_file, /* open_file */
fd_close_handle, /* close_handle */
file_destroy /* destroy */
};
static const struct fd_ops file_fd_ops =
{
file_get_poll_events, /* get_poll_events */
default_poll_event, /* poll_event */
file_flush, /* flush */
file_get_fd_type, /* get_fd_type */
default_fd_ioctl, /* ioctl */
default_fd_queue_async, /* queue_async */
default_fd_reselect_async, /* reselect_async */
default_fd_cancel_async /* cancel_async */
};
static inline int is_overlapped( const struct file *file )
{
return !(get_fd_options( file->fd ) & (FILE_SYNCHRONOUS_IO_ALERT | FILE_SYNCHRONOUS_IO_NONALERT));
}
/* create a file from a file descriptor */
/* if the function fails the fd is closed */
static 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();
return NULL;
}
if ((file = alloc_object( &file_ops )))
{
file->mode = st.st_mode;
file->access = default_fd_map_access( &file->obj, access );
if (!(file->fd = create_anonymous_fd( &file_fd_ops, fd, &file->obj,
FILE_SYNCHRONOUS_IO_NONALERT )))
{
release_object( file );
return NULL;
}
}
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->fd = fd;
grab_object( fd );
set_fd_user( fd, &file_fd_ops, &file->obj );
return &file->obj;
}
static struct object *create_file( const char *nameptr, data_size_t len, 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 (!(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 */
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; break;
default: set_error( STATUS_INVALID_PARAMETER ); goto done;
}
if (sd)
{
const SID *owner = sd_get_owner( sd );
if (!owner)
owner = token_get_user( current->process->token );
mode = sd_to_mode( sd, owner );
}
else
mode = (attrs & FILE_ATTRIBUTE_READONLY) ? 0444 : 0666;
if (len >= 4 &&
(!strcasecmp( name + len - 4, ".exe" ) || !strcasecmp( name + len - 4, ".com" )))
{
if (mode & S_IRUSR)
mode |= S_IXUSR;
if (mode & S_IRGRP)
mode |= S_IXGRP;
if (mode & S_IROTH)
mode |= S_IXOTH;
}
access = generic_file_map_access( access );
/* FIXME: should set error to STATUS_OBJECT_NAME_COLLISION if file existed before */
fd = open_fd( name, flags | O_NONBLOCK | O_LARGEFILE, &mode, access, sharing, options );
if (!fd) goto done;
if (S_ISDIR(mode))
obj = create_dir_obj( fd );
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;
}
/* check if two file objects point to the same file */
int is_same_file( struct file *file1, struct file *file2 )
{
return is_same_file_fd( file1->fd, file2->fd );
}
/* create a temp file for anonymous mappings */
struct file *create_temp_file( int access )
{
char tmpfn[16];
int fd;
sprintf( tmpfn, "anonmap.XXXXXX" ); /* create it in the server directory */
fd = mkstemps( tmpfn, 0 );
if (fd == -1)
{
file_set_error();
return NULL;
}
unlink( tmpfn );
return create_file_for_fd( fd, access, 0 );
}
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 int file_get_poll_events( struct fd *fd )
{
struct file *file = get_fd_user( fd );
int events = 0;
assert( file->obj.ops == &file_ops );
if (file->access & FILE_UNIX_READ_ACCESS) events |= POLLIN;
if (file->access & FILE_UNIX_WRITE_ACCESS) events |= POLLOUT;
return events;
}
static void file_flush( struct fd *fd, struct event **event )
{
int unix_fd = get_unix_fd( fd );
if (unix_fd != -1 && fsync( unix_fd ) == -1) file_set_error();
}
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 );
}
static unsigned int generic_file_map_access( unsigned int access )
{
if (access & GENERIC_READ) access |= FILE_GENERIC_READ;
if (access & GENERIC_WRITE) access |= FILE_GENERIC_WRITE;
if (access & GENERIC_EXECUTE) access |= FILE_GENERIC_EXECUTE;
if (access & GENERIC_ALL) access |= FILE_ALL_ACCESS;
return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
}
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;
const SID *user;
const SID *group;
size_t dacl_size;
ACCESS_ALLOWED_ACE *aaa;
ACL *dacl;
SID *sid;
char *ptr;
const SID *world_sid = security_world_sid;
const SID *local_system_sid = security_local_system_sid;
assert( obj->ops == &file_ops );
unix_fd = get_file_unix_fd( file );
if (unix_fd == -1) return obj->sd;
if (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;
user = security_unix_uid_to_sid( st.st_uid );
group = token_get_primary_group( current->process->token );
dacl_size = sizeof(ACL) + FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
FIELD_OFFSET(SID, SubAuthority[local_system_sid->SubAuthorityCount]);
if (st.st_mode & S_IRWXU)
dacl_size += FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
if (st.st_mode & S_IRWXO)
dacl_size += FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
FIELD_OFFSET(SID, SubAuthority[world_sid->SubAuthorityCount]);
sd = mem_alloc( sizeof(struct security_descriptor) +
FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) +
FIELD_OFFSET(SID, SubAuthority[group->SubAuthorityCount]) +
dacl_size );
if (!sd) return obj->sd;
sd->control = SE_DACL_PRESENT;
sd->owner_len = FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
sd->group_len = FIELD_OFFSET(SID, SubAuthority[group->SubAuthorityCount]);
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 = (ACL *)ptr;
dacl->AclRevision = ACL_REVISION;
dacl->Sbz1 = 0;
dacl->AclSize = dacl_size;
dacl->AceCount = 1 + (st.st_mode & S_IRWXU ? 1 : 0) + (st.st_mode & S_IRWXO ? 1 : 0);
dacl->Sbz2 = 0;
/* always give FILE_ALL_ACCESS for Local System */
aaa = (ACCESS_ALLOWED_ACE *)(dacl + 1);
aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
aaa->Header.AceFlags = 0;
aaa->Header.AceSize = FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
FIELD_OFFSET(SID, SubAuthority[local_system_sid->SubAuthorityCount]);
aaa->Mask = FILE_ALL_ACCESS;
sid = (SID *)&aaa->SidStart;
memcpy( sid, local_system_sid, FIELD_OFFSET(SID, SubAuthority[local_system_sid->SubAuthorityCount]) );
if (st.st_mode & S_IRWXU)
{
/* appropriate access rights for the user */
aaa = (ACCESS_ALLOWED_ACE *)ace_next( &aaa->Header );
aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
aaa->Header.AceFlags = 0;
aaa->Header.AceSize = FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
aaa->Mask = WRITE_DAC | WRITE_OWNER;
if (st.st_mode & S_IRUSR)
aaa->Mask |= FILE_GENERIC_READ;
if (st.st_mode & S_IWUSR)
aaa->Mask |= FILE_GENERIC_WRITE | DELETE;
if (st.st_mode & S_IXUSR)
aaa->Mask |= FILE_GENERIC_EXECUTE;
sid = (SID *)&aaa->SidStart;
memcpy( sid, user, FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) );
}
if (st.st_mode & S_IRWXO)
{
/* appropriate access rights for Everyone */
aaa = (ACCESS_ALLOWED_ACE *)ace_next( &aaa->Header );
aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
aaa->Header.AceFlags = 0;
aaa->Header.AceSize = FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
FIELD_OFFSET(SID, SubAuthority[world_sid->SubAuthorityCount]);
aaa->Mask = 0;
if (st.st_mode & S_IROTH)
aaa->Mask |= FILE_GENERIC_READ;
if (st.st_mode & S_IWOTH)
aaa->Mask |= FILE_GENERIC_WRITE | DELETE;
if (st.st_mode & S_IXOTH)
aaa->Mask |= FILE_GENERIC_EXECUTE;
sid = (SID *)&aaa->SidStart;
memcpy( sid, world_sid, FIELD_OFFSET(SID, SubAuthority[world_sid->SubAuthorityCount]) );
}
file->mode = st.st_mode;
file->uid = st.st_uid;
free( obj->sd );
obj->sd = sd;
return sd;
}
static mode_t sd_to_mode( const struct security_descriptor *sd, const SID *owner )
{
mode_t new_mode = 0;
mode_t denied_mode = 0;
int present;
const ACL *dacl = sd_get_dacl( sd, &present );
if (present && dacl)
{
const ACE_HEADER *ace = (const ACE_HEADER *)(dacl + 1);
ULONG i;
for (i = 0; i < dacl->AceCount; i++, ace_next( ace ))
{
const ACCESS_ALLOWED_ACE *aa_ace;
const ACCESS_DENIED_ACE *ad_ace;
const SID *sid;
if (ace->AceFlags & INHERIT_ONLY_ACE) continue;
switch (ace->AceType)
{
case ACCESS_DENIED_ACE_TYPE:
ad_ace = (const ACCESS_DENIED_ACE *)ace;
sid = (const SID *)&ad_ace->SidStart;
if (security_equal_sid( sid, security_world_sid ))
{
unsigned int access = generic_file_map_access( ad_ace->Mask );
if (access & FILE_READ_DATA)
denied_mode |= S_IROTH;
if (access & FILE_WRITE_DATA)
denied_mode |= S_IWOTH;
if (access & FILE_EXECUTE)
denied_mode |= S_IXOTH;
}
else if (security_equal_sid( sid, owner ))
{
unsigned int access = generic_file_map_access( ad_ace->Mask );
if (access & FILE_READ_DATA)
denied_mode |= S_IRUSR;
if (access & FILE_WRITE_DATA)
denied_mode |= S_IWUSR;
if (access & FILE_EXECUTE)
denied_mode |= S_IXUSR;
}
break;
case ACCESS_ALLOWED_ACE_TYPE:
aa_ace = (const ACCESS_ALLOWED_ACE *)ace;
sid = (const SID *)&aa_ace->SidStart;
if (security_equal_sid( sid, security_world_sid ))
{
unsigned int access = generic_file_map_access( aa_ace->Mask );
if (access & FILE_READ_DATA)
new_mode |= S_IROTH;
if (access & FILE_WRITE_DATA)
new_mode |= S_IWOTH;
if (access & FILE_EXECUTE)
new_mode |= S_IXOTH;
}
else if (security_equal_sid( sid, owner ))
{
unsigned int access = generic_file_map_access( aa_ace->Mask );
if (access & FILE_READ_DATA)
new_mode |= S_IRUSR;
if (access & FILE_WRITE_DATA)
new_mode |= S_IWUSR;
if (access & FILE_EXECUTE)
new_mode |= S_IXUSR;
}
break;
}
}
}
else
/* no ACL means full access rights to anyone */
new_mode = S_IRWXU | S_IRWXO;
return new_mode & ~denied_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 SID *owner;
mode_t mode;
int unix_fd;
assert( obj->ops == &file_ops );
unix_fd = get_file_unix_fd( file );
if (unix_fd == -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 || !security_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 = file->mode & (S_ISUID|S_ISGID|S_ISVTX|S_IRWXG);
mode |= sd_to_mode( sd, owner );
if (file->mode != mode)
{
if (fchmod( unix_fd, mode ) == -1)
{
file_set_error();
return 0;
}
file->mode = mode;
}
}
return 1;
}
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 EPERM: set_error( STATUS_ACCESS_DENIED ); break;
case EROFS: set_error( STATUS_MEDIA_WRITE_PROTECTED ); 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;
#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 );
}
struct file *grab_file_unless_removable( struct file *file )
{
if (is_fd_removable( file->fd )) return NULL;
return (struct file *)grab_object( file );
}
/* extend a file beyond the current end of file */
static int extend_file( struct file *file, file_pos_t new_size )
{
static const char zero;
int unix_fd = get_file_unix_fd( file );
off_t size = new_size;
if (unix_fd == -1) return 0;
if (sizeof(new_size) > sizeof(size) && size != new_size)
{
set_error( STATUS_INVALID_PARAMETER );
return 0;
}
/* extend the file one byte beyond the requested size and then truncate it */
/* this should work around ftruncate implementations that can't extend files */
if (pwrite( unix_fd, &zero, 1, size ) != -1)
{
ftruncate( unix_fd, size );
return 1;
}
file_set_error();
return 0;
}
/* try to grow the file to the specified size */
int grow_file( struct file *file, file_pos_t size )
{
struct stat st;
int unix_fd = get_file_unix_fd( file );
if (unix_fd == -1) return 0;
if (fstat( unix_fd, &st ) == -1)
{
file_set_error();
return 0;
}
if (st.st_size >= size) return 1; /* already large enough */
return extend_file( file, size );
}
/* create a file */
DECL_HANDLER(create_file)
{
struct object *file;
const struct object_attributes *objattr = get_req_data();
const struct security_descriptor *sd;
const char *name;
data_size_t name_len;
reply->handle = 0;
if (!objattr_is_valid( objattr, get_req_data_size() ))
return;
/* name is transferred in the unix codepage outside of the objattr structure */
if (objattr->name_len)
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
sd = objattr->sd_len ? (const struct security_descriptor *)(objattr + 1) : NULL;
name = (const char *)get_req_data() + sizeof(*objattr) + objattr->sd_len;
name_len = get_req_data_size() - sizeof(*objattr) - objattr->sd_len;
reply->handle = 0;
if ((file = create_file( name, name_len, req->access,
req->sharing, req->create, req->options,
req->attrs, sd )))
{
reply->handle = alloc_handle( current->process, file, req->access, req->attributes );
release_object( file );
}
}
/* 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_overlapped( file );
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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