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