server/file.c

   1 /*
   2  * Server-side file management
   3  *
   4  * Copyright (C) 1998 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <assert.h>
  25 #include <fcntl.h>
  26 #include <stdarg.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <stdlib.h>
  30 #include <errno.h>
  31 #include <sys/stat.h>
  32 #include <sys/time.h>
  33 #include <sys/types.h>
  34 #include <time.h>
  35 #include <unistd.h>
  36 #ifdef HAVE_UTIME_H
  37 #include <utime.h>
  38 #endif
  39 #ifdef HAVE_POLL_H
  40 #include <poll.h>
  41 #endif
  42
  43 #include "ntstatus.h"
  44 #define WIN32_NO_STATUS
  45 #include "windef.h"
  46 #include "winternl.h"
  47
  48 #include "file.h"
  49 #include "handle.h"
  50 #include "thread.h"
  51 #include "request.h"
  52 #include "process.h"
  53 #include "security.h"
  54
  55 struct file
  56 {
  57     struct object       obj;        /* object header */
  58     struct fd          *fd;         /* file descriptor for this file */
  59     unsigned int        access;     /* file access (FILE_READ_DATA etc.) */
  60     mode_t              mode;       /* file stat.st_mode */
  61     uid_t               uid;        /* file stat.st_uid */
  62 };
  63
  64 static unsigned int generic_file_map_access( unsigned int access );
  65
  66 static void file_dump( struct object *obj, int verbose );
  67 static struct object_type *file_get_type( struct object *obj );
  68 static struct fd *file_get_fd( struct object *obj );
  69 static struct security_descriptor *file_get_sd( struct object *obj );
  70 static int file_set_sd( struct object *obj, const struct security_descriptor *sd, unsigned int set_info );
  71 static void file_destroy( struct object *obj );
  72
  73 static int file_get_poll_events( struct fd *fd );
  74 static obj_handle_t file_flush( struct fd *fd, const async_data_t *async, int blocking );
  75 static enum server_fd_type file_get_fd_type( struct fd *fd );
  76
  77 static const struct object_ops file_ops =
  78 {
  79     sizeof(struct file),          /* size */
  80     file_dump,                    /* dump */
  81     file_get_type,                /* get_type */
  82     add_queue,                    /* add_queue */
  83     remove_queue,                 /* remove_queue */
  84     default_fd_signaled,          /* signaled */
  85     no_satisfied,                 /* satisfied */
  86     no_signal,                    /* signal */
  87     file_get_fd,                  /* get_fd */
  88     default_fd_map_access,        /* map_access */
  89     file_get_sd,                  /* get_sd */
  90     file_set_sd,                  /* set_sd */
  91     no_lookup_name,               /* lookup_name */
  92     no_open_file,                 /* open_file */
  93     fd_close_handle,              /* close_handle */
  94     file_destroy                  /* destroy */
  95 };
  96
  97 static const struct fd_ops file_fd_ops =
  98 {
  99     file_get_poll_events,         /* get_poll_events */
 100     default_poll_event,           /* poll_event */
 101     file_get_fd_type,             /* get_fd_type */
 102     no_fd_read,                   /* read */
 103     no_fd_write,                  /* write */
 104     file_flush,                   /* flush */
 105     default_fd_ioctl,             /* ioctl */
 106     default_fd_queue_async,       /* queue_async */
 107     default_fd_reselect_async,    /* reselect_async */
 108     default_fd_cancel_async       /* cancel_async */
 109 };
 110
 111 static inline int is_overlapped( const struct file *file )
 112 {
 113     return !(get_fd_options( file->fd ) & (FILE_SYNCHRONOUS_IO_ALERT | FILE_SYNCHRONOUS_IO_NONALERT));
 114 }
 115
 116 /* create a file from a file descriptor */
 117 /* if the function fails the fd is closed */
 118 struct file *create_file_for_fd( int fd, unsigned int access, unsigned int sharing )
 119 {
 120     struct file *file;
 121     struct stat st;
 122
 123     if (fstat( fd, &st ) == -1)
 124     {
 125         file_set_error();
 126         close( fd );
 127         return NULL;
 128     }
 129
 130     if (!(file = alloc_object( &file_ops )))
 131     {
 132         close( fd );
 133         return NULL;
 134     }
 135
 136     file->mode = st.st_mode;
 137     file->access = default_fd_map_access( &file->obj, access );
 138     if (!(file->fd = create_anonymous_fd( &file_fd_ops, fd, &file->obj,
 139                                           FILE_SYNCHRONOUS_IO_NONALERT )))
 140     {
 141         release_object( file );
 142         return NULL;
 143     }
 144     allow_fd_caching( file->fd );
 145     return file;
 146 }
 147
 148 /* create a file by duplicating an fd object */
 149 struct file *create_file_for_fd_obj( struct fd *fd, unsigned int access, unsigned int sharing )
 150 {
 151     struct file *file;
 152     struct stat st;
 153
 154     if (fstat( get_unix_fd(fd), &st ) == -1)
 155     {
 156         file_set_error();
 157         return NULL;
 158     }
 159
 160     if ((file = alloc_object( &file_ops )))
 161     {
 162         file->mode = st.st_mode;
 163         file->access = default_fd_map_access( &file->obj, access );
 164         if (!(file->fd = dup_fd_object( fd, access, sharing, FILE_SYNCHRONOUS_IO_NONALERT )))
 165         {
 166             release_object( file );
 167             return NULL;
 168         }
 169         set_fd_user( file->fd, &file_fd_ops, &file->obj );
 170     }
 171     return file;
 172 }
 173
 174 static struct object *create_file_obj( struct fd *fd, unsigned int access, mode_t mode )
 175 {
 176     struct file *file = alloc_object( &file_ops );
 177
 178     if (!file) return NULL;
 179     file->access  = access;
 180     file->mode    = mode;
 181     file->uid     = ~(uid_t)0;
 182     file->fd      = fd;
 183     grab_object( fd );
 184     set_fd_user( fd, &file_fd_ops, &file->obj );
 185     return &file->obj;
 186 }
 187
 188 static struct object *create_file( struct fd *root, const char *nameptr, data_size_t len,
 189                                    unsigned int access, unsigned int sharing, int create,
 190                                    unsigned int options, unsigned int attrs,
 191                                    const struct security_descriptor *sd )
 192 {
 193     struct object *obj = NULL;
 194     struct fd *fd;
 195     int flags;
 196     char *name;
 197     mode_t mode;
 198
 199     if (!len || ((nameptr[0] == '/') ^ !root))
 200     {
 201         set_error( STATUS_OBJECT_PATH_SYNTAX_BAD );
 202         return NULL;
 203     }
 204     if (!(name = mem_alloc( len + 1 ))) return NULL;
 205     memcpy( name, nameptr, len );
 206     name[len] = 0;
 207
 208     switch(create)
 209     {
 210     case FILE_CREATE:       flags = O_CREAT | O_EXCL; break;
 211     case FILE_OVERWRITE_IF: /* FIXME: the difference is whether we trash existing attr or not */
 212                             access |= FILE_WRITE_ATTRIBUTES;
 213     case FILE_SUPERSEDE:    flags = O_CREAT | O_TRUNC; break;
 214     case FILE_OPEN:         flags = 0; break;
 215     case FILE_OPEN_IF:      flags = O_CREAT; break;
 216     case FILE_OVERWRITE:    flags = O_TRUNC;
 217                             access |= FILE_WRITE_ATTRIBUTES; break;
 218     default:                set_error( STATUS_INVALID_PARAMETER ); goto done;
 219     }
 220
 221     if (sd)
 222     {
 223         const SID *owner = sd_get_owner( sd );
 224         if (!owner)
 225             owner = token_get_user( current->process->token );
 226         mode = sd_to_mode( sd, owner );
 227     }
 228     else if (options & FILE_DIRECTORY_FILE)
 229         mode = (attrs & FILE_ATTRIBUTE_READONLY) ? 0555 : 0777;
 230     else
 231         mode = (attrs & FILE_ATTRIBUTE_READONLY) ? 0444 : 0666;
 232
 233     if (len >= 4 &&
 234         (!strcasecmp( name + len - 4, ".exe" ) || !strcasecmp( name + len - 4, ".com" )))
 235     {
 236         if (mode & S_IRUSR)
 237             mode |= S_IXUSR;
 238         if (mode & S_IRGRP)
 239             mode |= S_IXGRP;
 240         if (mode & S_IROTH)
 241             mode |= S_IXOTH;
 242     }
 243
 244     access = generic_file_map_access( access );
 245
 246     /* FIXME: should set error to STATUS_OBJECT_NAME_COLLISION if file existed before */
 247     fd = open_fd( root, name, flags | O_NONBLOCK | O_LARGEFILE, &mode, access, sharing, options );
 248     if (!fd) goto done;
 249
 250     if (S_ISDIR(mode))
 251         obj = create_dir_obj( fd, access, mode );
 252     else if (S_ISCHR(mode) && is_serial_fd( fd ))
 253         obj = create_serial( fd );
 254     else
 255         obj = create_file_obj( fd, access, mode );
 256
 257     release_object( fd );
 258
 259 done:
 260     free( name );
 261     return obj;
 262 }
 263
 264 /* check if two file objects point to the same file */
 265 int is_same_file( struct file *file1, struct file *file2 )
 266 {
 267     return is_same_file_fd( file1->fd, file2->fd );
 268 }
 269
 270 static void file_dump( struct object *obj, int verbose )
 271 {
 272     struct file *file = (struct file *)obj;
 273     assert( obj->ops == &file_ops );
 274     fprintf( stderr, "File fd=%p\n", file->fd );
 275 }
 276
 277 static struct object_type *file_get_type( struct object *obj )
 278 {
 279     static const WCHAR name[] = {'F','i','l','e'};
 280     static const struct unicode_str str = { name, sizeof(name) };
 281     return get_object_type( &str );
 282 }
 283
 284 static int file_get_poll_events( struct fd *fd )
 285 {
 286     struct file *file = get_fd_user( fd );
 287     int events = 0;
 288     assert( file->obj.ops == &file_ops );
 289     if (file->access & FILE_UNIX_READ_ACCESS) events |= POLLIN;
 290     if (file->access & FILE_UNIX_WRITE_ACCESS) events |= POLLOUT;
 291     return events;
 292 }
 293
 294 static obj_handle_t file_flush( struct fd *fd, const async_data_t *async, int blocking )
 295 {
 296     int unix_fd = get_unix_fd( fd );
 297     if (unix_fd != -1 && fsync( unix_fd ) == -1) file_set_error();
 298     return 0;
 299 }
 300
 301 static enum server_fd_type file_get_fd_type( struct fd *fd )
 302 {
 303     struct file *file = get_fd_user( fd );
 304
 305     if (S_ISREG(file->mode) || S_ISBLK(file->mode)) return FD_TYPE_FILE;
 306     if (S_ISDIR(file->mode)) return FD_TYPE_DIR;
 307     return FD_TYPE_CHAR;
 308 }
 309
 310 static struct fd *file_get_fd( struct object *obj )
 311 {
 312     struct file *file = (struct file *)obj;
 313     assert( obj->ops == &file_ops );
 314     return (struct fd *)grab_object( file->fd );
 315 }
 316
 317 static unsigned int generic_file_map_access( unsigned int access )
 318 {
 319     if (access & GENERIC_READ)    access |= FILE_GENERIC_READ;
 320     if (access & GENERIC_WRITE)   access |= FILE_GENERIC_WRITE;
 321     if (access & GENERIC_EXECUTE) access |= FILE_GENERIC_EXECUTE;
 322     if (access & GENERIC_ALL)     access |= FILE_ALL_ACCESS;
 323     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 324 }
 325
 326 struct security_descriptor *mode_to_sd( mode_t mode, const SID *user, const SID *group )
 327 {
 328     struct security_descriptor *sd;
 329     size_t dacl_size;
 330     ACE_HEADER *current_ace;
 331     ACCESS_ALLOWED_ACE *aaa;
 332     ACL *dacl;
 333     SID *sid;
 334     char *ptr;
 335     const SID *world_sid = security_world_sid;
 336     const SID *local_system_sid = security_local_system_sid;
 337
 338     dacl_size = sizeof(ACL) + FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
 339         security_sid_len( local_system_sid );
 340     if (mode & S_IRWXU)
 341         dacl_size += FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) + security_sid_len( user );
 342     if ((!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) ||
 343         (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) ||
 344         (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH))))
 345         dacl_size += FIELD_OFFSET(ACCESS_DENIED_ACE, SidStart) + security_sid_len( user );
 346     if (mode & S_IRWXO)
 347         dacl_size += FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) + security_sid_len( world_sid );
 348
 349     sd = mem_alloc( sizeof(struct security_descriptor) +
 350                     security_sid_len( user ) + security_sid_len( group ) +
 351                     dacl_size );
 352     if (!sd) return sd;
 353
 354     sd->control = SE_DACL_PRESENT;
 355     sd->owner_len = security_sid_len( user );
 356     sd->group_len = security_sid_len( group );
 357     sd->sacl_len = 0;
 358     sd->dacl_len = dacl_size;
 359
 360     ptr = (char *)(sd + 1);
 361     memcpy( ptr, user, sd->owner_len );
 362     ptr += sd->owner_len;
 363     memcpy( ptr, group, sd->group_len );
 364     ptr += sd->group_len;
 365
 366     dacl = (ACL *)ptr;
 367     dacl->AclRevision = ACL_REVISION;
 368     dacl->Sbz1 = 0;
 369     dacl->AclSize = dacl_size;
 370     dacl->AceCount = 1 + (mode & S_IRWXU ? 1 : 0) + (mode & S_IRWXO ? 1 : 0);
 371     if ((!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) ||
 372         (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) ||
 373         (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH))))
 374         dacl->AceCount++;
 375     dacl->Sbz2 = 0;
 376
 377     /* always give FILE_ALL_ACCESS for Local System */
 378     aaa = (ACCESS_ALLOWED_ACE *)(dacl + 1);
 379     current_ace = &aaa->Header;
 380     aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 381     aaa->Header.AceFlags = (mode & S_IFDIR) ? OBJECT_INHERIT_ACE | CONTAINER_INHERIT_ACE : 0;
 382     aaa->Header.AceSize = FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) + security_sid_len( local_system_sid );
 383     aaa->Mask = FILE_ALL_ACCESS;
 384     sid = (SID *)&aaa->SidStart;
 385     memcpy( sid, local_system_sid, security_sid_len( local_system_sid ));
 386
 387     if (mode & S_IRWXU)
 388     {
 389         /* appropriate access rights for the user */
 390         aaa = (ACCESS_ALLOWED_ACE *)ace_next( current_ace );
 391         current_ace = &aaa->Header;
 392         aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 393         aaa->Header.AceFlags = (mode & S_IFDIR) ? OBJECT_INHERIT_ACE | CONTAINER_INHERIT_ACE : 0;
 394         aaa->Header.AceSize = FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) + security_sid_len( user );
 395         aaa->Mask = WRITE_DAC | WRITE_OWNER;
 396         if (mode & S_IRUSR)
 397             aaa->Mask |= FILE_GENERIC_READ | FILE_GENERIC_EXECUTE;
 398         if (mode & S_IWUSR)
 399             aaa->Mask |= FILE_GENERIC_WRITE | DELETE | FILE_DELETE_CHILD;
 400         sid = (SID *)&aaa->SidStart;
 401         memcpy( sid, user, security_sid_len( user ));
 402     }
 403     if ((!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) ||
 404         (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) ||
 405         (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH))))
 406     {
 407         /* deny just in case the user is a member of the group */
 408         ACCESS_DENIED_ACE *ada = (ACCESS_DENIED_ACE *)ace_next( current_ace );
 409         current_ace = &ada->Header;
 410         ada->Header.AceType = ACCESS_DENIED_ACE_TYPE;
 411         ada->Header.AceFlags = (mode & S_IFDIR) ? OBJECT_INHERIT_ACE | CONTAINER_INHERIT_ACE : 0;
 412         ada->Header.AceSize = FIELD_OFFSET(ACCESS_DENIED_ACE, SidStart) + security_sid_len( user );
 413         ada->Mask = 0;
 414         if (!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH)))
 415             ada->Mask |= FILE_GENERIC_READ | FILE_GENERIC_EXECUTE;
 416         if (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IROTH)))
 417             ada->Mask |= FILE_GENERIC_WRITE | DELETE | FILE_DELETE_CHILD;
 418         ada->Mask &= ~STANDARD_RIGHTS_ALL; /* never deny standard rights */
 419         sid = (SID *)&ada->SidStart;
 420         memcpy( sid, user, security_sid_len( user ));
 421     }
 422     if (mode & S_IRWXO)
 423     {
 424         /* appropriate access rights for Everyone */
 425         aaa = (ACCESS_ALLOWED_ACE *)ace_next( current_ace );
 426         current_ace = &aaa->Header;
 427         aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 428         aaa->Header.AceFlags = (mode & S_IFDIR) ? OBJECT_INHERIT_ACE | CONTAINER_INHERIT_ACE : 0;
 429         aaa->Header.AceSize = FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) + security_sid_len( world_sid );
 430         aaa->Mask = 0;
 431         if (mode & S_IROTH)
 432             aaa->Mask |= FILE_GENERIC_READ | FILE_GENERIC_EXECUTE;
 433         if (mode & S_IWOTH)
 434             aaa->Mask |= FILE_GENERIC_WRITE | DELETE | FILE_DELETE_CHILD;
 435         sid = (SID *)&aaa->SidStart;
 436         memcpy( sid, world_sid, security_sid_len( world_sid ));
 437     }
 438
 439     return sd;
 440 }
 441
 442 static struct security_descriptor *file_get_sd( struct object *obj )
 443 {
 444     struct file *file = (struct file *)obj;
 445     struct stat st;
 446     int unix_fd;
 447     struct security_descriptor *sd;
 448
 449     assert( obj->ops == &file_ops );
 450
 451     unix_fd = get_file_unix_fd( file );
 452
 453     if (unix_fd == -1 || fstat( unix_fd, &st ) == -1)
 454         return obj->sd;
 455
 456     /* mode and uid the same? if so, no need to re-generate security descriptor */
 457     if (obj->sd && (st.st_mode & (S_IRWXU|S_IRWXO)) == (file->mode & (S_IRWXU|S_IRWXO)) &&
 458         (st.st_uid == file->uid))
 459         return obj->sd;
 460
 461     sd = mode_to_sd( st.st_mode,
 462                      security_unix_uid_to_sid( st.st_uid ),
 463                      token_get_primary_group( current->process->token ));
 464     if (!sd) return obj->sd;
 465
 466     file->mode = st.st_mode;
 467     file->uid = st.st_uid;
 468     free( obj->sd );
 469     obj->sd = sd;
 470     return sd;
 471 }
 472
 473 static mode_t file_access_to_mode( unsigned int access )
 474 {
 475     mode_t mode = 0;
 476
 477     access = generic_file_map_access( access );
 478     if (access & FILE_READ_DATA)  mode |= 4;
 479     if (access & (FILE_WRITE_DATA|FILE_APPEND_DATA)) mode |= 2;
 480     if (access & FILE_EXECUTE)    mode |= 1;
 481     return mode;
 482 }
 483
 484 mode_t sd_to_mode( const struct security_descriptor *sd, const SID *owner )
 485 {
 486     mode_t new_mode = 0;
 487     mode_t bits_to_set = ~0;
 488     mode_t mode;
 489     int present;
 490     const ACL *dacl = sd_get_dacl( sd, &present );
 491     const SID *user = token_get_user( current->process->token );
 492     if (present && dacl)
 493     {
 494         const ACE_HEADER *ace = (const ACE_HEADER *)(dacl + 1);
 495         ULONG i;
 496         for (i = 0; i < dacl->AceCount; i++, ace = ace_next( ace ))
 497         {
 498             const ACCESS_ALLOWED_ACE *aa_ace;
 499             const ACCESS_DENIED_ACE *ad_ace;
 500             const SID *sid;
 501
 502             if (ace->AceFlags & INHERIT_ONLY_ACE) continue;
 503
 504             switch (ace->AceType)
 505             {
 506                 case ACCESS_DENIED_ACE_TYPE:
 507                     ad_ace = (const ACCESS_DENIED_ACE *)ace;
 508                     sid = (const SID *)&ad_ace->SidStart;
 509                     mode = file_access_to_mode( ad_ace->Mask );
 510                     if (security_equal_sid( sid, security_world_sid ))
 511                     {
 512                         bits_to_set &= ~((mode << 6) | (mode << 3) | mode); /* all */
 513                     }
 514                     else if ((security_equal_sid( user, owner ) &&
 515                               token_sid_present( current->process->token, sid, TRUE )))
 516                     {
 517                         bits_to_set &= ~((mode << 6) | (mode << 3));  /* user + group */
 518                     }
 519                     else if (security_equal_sid( sid, owner ))
 520                     {
 521                         bits_to_set &= ~(mode << 6);  /* user only */
 522                     }
 523                     break;
 524                 case ACCESS_ALLOWED_ACE_TYPE:
 525                     aa_ace = (const ACCESS_ALLOWED_ACE *)ace;
 526                     sid = (const SID *)&aa_ace->SidStart;
 527                     mode = file_access_to_mode( aa_ace->Mask );
 528                     if (security_equal_sid( sid, security_world_sid ))
 529                     {
 530                         mode = (mode << 6) | (mode << 3) | mode;  /* all */
 531                         new_mode |= mode & bits_to_set;
 532                         bits_to_set &= ~mode;
 533                     }
 534                     else if ((security_equal_sid( user, owner ) &&
 535                               token_sid_present( current->process->token, sid, FALSE )))
 536                     {
 537                         mode = (mode << 6) | (mode << 3);  /* user + group */
 538                         new_mode |= mode & bits_to_set;
 539                         bits_to_set &= ~mode;
 540                     }
 541                     else if (security_equal_sid( sid, owner ))
 542                     {
 543                         mode = (mode << 6);  /* user only */
 544                         new_mode |= mode & bits_to_set;
 545                         bits_to_set &= ~mode;
 546                     }
 547                     break;
 548             }
 549         }
 550     }
 551     else
 552         /* no ACL means full access rights to anyone */
 553         new_mode = S_IRWXU | S_IRWXG | S_IRWXO;
 554
 555     return new_mode;
 556 }
 557
 558 static int file_set_sd( struct object *obj, const struct security_descriptor *sd,
 559                         unsigned int set_info )
 560 {
 561     struct file *file = (struct file *)obj;
 562     const SID *owner;
 563     struct stat st;
 564     mode_t mode;
 565     int unix_fd;
 566
 567     assert( obj->ops == &file_ops );
 568
 569     unix_fd = get_file_unix_fd( file );
 570
 571     if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 1;
 572
 573     if (set_info & OWNER_SECURITY_INFORMATION)
 574     {
 575         owner = sd_get_owner( sd );
 576         if (!owner)
 577         {
 578             set_error( STATUS_INVALID_SECURITY_DESCR );
 579             return 0;
 580         }
 581         if (!obj->sd || !security_equal_sid( owner, sd_get_owner( obj->sd ) ))
 582         {
 583             /* FIXME: get Unix uid and call fchown */
 584         }
 585     }
 586     else if (obj->sd)
 587         owner = sd_get_owner( obj->sd );
 588     else
 589         owner = token_get_user( current->process->token );
 590
 591     /* group and sacl not supported */
 592
 593     if (set_info & DACL_SECURITY_INFORMATION)
 594     {
 595         /* keep the bits that we don't map to access rights in the ACL */
 596         mode = st.st_mode & (S_ISUID|S_ISGID|S_ISVTX);
 597         mode |= sd_to_mode( sd, owner );
 598
 599         if (((st.st_mode ^ mode) & (S_IRWXU|S_IRWXG|S_IRWXO)) && fchmod( unix_fd, mode ) == -1)
 600         {
 601             file_set_error();
 602             return 0;
 603         }
 604     }
 605     return 1;
 606 }
 607
 608 static void file_destroy( struct object *obj )
 609 {
 610     struct file *file = (struct file *)obj;
 611     assert( obj->ops == &file_ops );
 612
 613     if (file->fd) release_object( file->fd );
 614 }
 615
 616 /* set the last error depending on errno */
 617 void file_set_error(void)
 618 {
 619     switch (errno)
 620     {
 621     case ETXTBSY:
 622     case EAGAIN:    set_error( STATUS_SHARING_VIOLATION ); break;
 623     case EBADF:     set_error( STATUS_INVALID_HANDLE ); break;
 624     case ENOSPC:    set_error( STATUS_DISK_FULL ); break;
 625     case EACCES:
 626     case ESRCH:
 627     case EROFS:
 628     case EPERM:     set_error( STATUS_ACCESS_DENIED ); break;
 629     case EBUSY:     set_error( STATUS_FILE_LOCK_CONFLICT ); break;
 630     case ENOENT:    set_error( STATUS_NO_SUCH_FILE ); break;
 631     case EISDIR:    set_error( STATUS_FILE_IS_A_DIRECTORY ); break;
 632     case ENFILE:
 633     case EMFILE:    set_error( STATUS_TOO_MANY_OPENED_FILES ); break;
 634     case EEXIST:    set_error( STATUS_OBJECT_NAME_COLLISION ); break;
 635     case EINVAL:    set_error( STATUS_INVALID_PARAMETER ); break;
 636     case ESPIPE:    set_error( STATUS_ILLEGAL_FUNCTION ); break;
 637     case ENOTEMPTY: set_error( STATUS_DIRECTORY_NOT_EMPTY ); break;
 638     case EIO:       set_error( STATUS_ACCESS_VIOLATION ); break;
 639     case ENOTDIR:   set_error( STATUS_NOT_A_DIRECTORY ); break;
 640     case EFBIG:     set_error( STATUS_SECTION_TOO_BIG ); break;
 641     case ENODEV:    set_error( STATUS_NO_SUCH_DEVICE ); break;
 642     case ENXIO:     set_error( STATUS_NO_SUCH_DEVICE ); break;
 643 #ifdef EOVERFLOW
 644     case EOVERFLOW: set_error( STATUS_INVALID_PARAMETER ); break;
 645 #endif
 646     default:
 647         perror("wineserver: file_set_error() can't map error");
 648         set_error( STATUS_UNSUCCESSFUL );
 649         break;
 650     }
 651 }
 652
 653 struct file *get_file_obj( struct process *process, obj_handle_t handle, unsigned int access )
 654 {
 655     return (struct file *)get_handle_obj( process, handle, access, &file_ops );
 656 }
 657
 658 int get_file_unix_fd( struct file *file )
 659 {
 660     return get_unix_fd( file->fd );
 661 }
 662
 663 /* create a file */
 664 DECL_HANDLER(create_file)
 665 {
 666     struct object *file;
 667     struct fd *root_fd = NULL;
 668     const struct object_attributes *objattr = get_req_data();
 669     const struct security_descriptor *sd;
 670     const char *name;
 671     data_size_t name_len;
 672
 673     reply->handle = 0;
 674
 675     if (!objattr_is_valid( objattr, get_req_data_size() ))
 676         return;
 677     /* name is transferred in the unix codepage outside of the objattr structure */
 678     if (objattr->name_len)
 679     {
 680         set_error( STATUS_INVALID_PARAMETER );
 681         return;
 682     }
 683
 684     if (objattr->rootdir)
 685     {
 686         struct dir *root;
 687
 688         if (!(root = get_dir_obj( current->process, objattr->rootdir, 0 ))) return;
 689         root_fd = get_obj_fd( (struct object *)root );
 690         release_object( root );
 691         if (!root_fd) return;
 692     }
 693
 694     sd = objattr->sd_len ? (const struct security_descriptor *)(objattr + 1) : NULL;
 695
 696     name = (const char *)get_req_data() + sizeof(*objattr) + objattr->sd_len;
 697     name_len = get_req_data_size() - sizeof(*objattr) - objattr->sd_len;
 698
 699     reply->handle = 0;
 700     if ((file = create_file( root_fd, name, name_len, req->access, req->sharing,
 701                              req->create, req->options, req->attrs, sd )))
 702     {
 703         reply->handle = alloc_handle( current->process, file, req->access, req->attributes );
 704         release_object( file );
 705     }
 706     if (root_fd) release_object( root_fd );
 707 }
 708
 709 /* allocate a file handle for a Unix fd */
 710 DECL_HANDLER(alloc_file_handle)
 711 {
 712     struct file *file;
 713     int fd;
 714
 715     reply->handle = 0;
 716     if ((fd = thread_get_inflight_fd( current, req->fd )) == -1)
 717     {
 718         set_error( STATUS_INVALID_HANDLE );
 719         return;
 720     }
 721     if ((file = create_file_for_fd( fd, req->access, FILE_SHARE_READ | FILE_SHARE_WRITE )))
 722     {
 723         reply->handle = alloc_handle( current->process, file, req->access, req->attributes );
 724         release_object( file );
 725     }
 726 }
 727
 728 /* lock a region of a file */
 729 DECL_HANDLER(lock_file)
 730 {
 731     struct file *file;
 732
 733     if ((file = get_file_obj( current->process, req->handle, 0 )))
 734     {
 735         reply->handle = lock_fd( file->fd, req->offset, req->count, req->shared, req->wait );
 736         reply->overlapped = is_overlapped( file );
 737         release_object( file );
 738     }
 739 }
 740
 741 /* unlock a region of a file */
 742 DECL_HANDLER(unlock_file)
 743 {
 744     struct file *file;
 745
 746     if ((file = get_file_obj( current->process, req->handle, 0 )))
 747     {
 748         unlock_fd( file->fd, req->offset, req->count );
 749         release_object( file );
 750     }
 751 }