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     }
 140     return file;
 141 }
 142
 143 static struct object *create_file_obj( struct fd *fd, unsigned int access, mode_t mode )
 144 {
 145     struct file *file = alloc_object( &file_ops );
 146
 147     if (!file) return NULL;
 148     file->access  = access;
 149     file->mode    = mode;
 150     file->uid     = ~(uid_t)0;
 151     file->fd      = fd;
 152     grab_object( fd );
 153     set_fd_user( fd, &file_fd_ops, &file->obj );
 154     return &file->obj;
 155 }
 156
 157 static struct object *create_file( struct fd *root, const char *nameptr, data_size_t len,
 158                                    unsigned int access, unsigned int sharing, int create,
 159                                    unsigned int options, unsigned int attrs,
 160                                    const struct security_descriptor *sd )
 161 {
 162     struct object *obj = NULL;
 163     struct fd *fd;
 164     int flags;
 165     char *name;
 166     mode_t mode;
 167
 168     if (!len || ((nameptr[0] == '/') ^ !root))
 169     {
 170         set_error( STATUS_OBJECT_PATH_SYNTAX_BAD );
 171         return NULL;
 172     }
 173     if (!(name = mem_alloc( len + 1 ))) return NULL;
 174     memcpy( name, nameptr, len );
 175     name[len] = 0;
 176
 177     switch(create)
 178     {
 179     case FILE_CREATE:       flags = O_CREAT | O_EXCL; break;
 180     case FILE_OVERWRITE_IF: /* FIXME: the difference is whether we trash existing attr or not */
 181     case FILE_SUPERSEDE:    flags = O_CREAT | O_TRUNC; break;
 182     case FILE_OPEN:         flags = 0; break;
 183     case FILE_OPEN_IF:      flags = O_CREAT; break;
 184     case FILE_OVERWRITE:    flags = O_TRUNC; break;
 185     default:                set_error( STATUS_INVALID_PARAMETER ); goto done;
 186     }
 187
 188     if (sd)
 189     {
 190         const SID *owner = sd_get_owner( sd );
 191         if (!owner)
 192             owner = token_get_user( current->process->token );
 193         mode = sd_to_mode( sd, owner );
 194     }
 195     else
 196         mode = (attrs & FILE_ATTRIBUTE_READONLY) ? 0444 : 0666;
 197
 198     if (len >= 4 &&
 199         (!strcasecmp( name + len - 4, ".exe" ) || !strcasecmp( name + len - 4, ".com" )))
 200     {
 201         if (mode & S_IRUSR)
 202             mode |= S_IXUSR;
 203         if (mode & S_IRGRP)
 204             mode |= S_IXGRP;
 205         if (mode & S_IROTH)
 206             mode |= S_IXOTH;
 207     }
 208
 209     access = generic_file_map_access( access );
 210
 211     /* FIXME: should set error to STATUS_OBJECT_NAME_COLLISION if file existed before */
 212     fd = open_fd( root, name, flags | O_NONBLOCK | O_LARGEFILE, &mode, access, sharing, options );
 213     if (!fd) goto done;
 214
 215     if (S_ISDIR(mode))
 216         obj = create_dir_obj( fd, access, mode );
 217     else if (S_ISCHR(mode) && is_serial_fd( fd ))
 218         obj = create_serial( fd );
 219     else
 220         obj = create_file_obj( fd, access, mode );
 221
 222     release_object( fd );
 223
 224 done:
 225     free( name );
 226     return obj;
 227 }
 228
 229 /* check if two file objects point to the same file */
 230 int is_same_file( struct file *file1, struct file *file2 )
 231 {
 232     return is_same_file_fd( file1->fd, file2->fd );
 233 }
 234
 235 static void file_dump( struct object *obj, int verbose )
 236 {
 237     struct file *file = (struct file *)obj;
 238     assert( obj->ops == &file_ops );
 239     fprintf( stderr, "File fd=%p\n", file->fd );
 240 }
 241
 242 static int file_get_poll_events( struct fd *fd )
 243 {
 244     struct file *file = get_fd_user( fd );
 245     int events = 0;
 246     assert( file->obj.ops == &file_ops );
 247     if (file->access & FILE_UNIX_READ_ACCESS) events |= POLLIN;
 248     if (file->access & FILE_UNIX_WRITE_ACCESS) events |= POLLOUT;
 249     return events;
 250 }
 251
 252 static void file_flush( struct fd *fd, struct event **event )
 253 {
 254     int unix_fd = get_unix_fd( fd );
 255     if (unix_fd != -1 && fsync( unix_fd ) == -1) file_set_error();
 256 }
 257
 258 static enum server_fd_type file_get_fd_type( struct fd *fd )
 259 {
 260     struct file *file = get_fd_user( fd );
 261
 262     if (S_ISREG(file->mode) || S_ISBLK(file->mode)) return FD_TYPE_FILE;
 263     if (S_ISDIR(file->mode)) return FD_TYPE_DIR;
 264     return FD_TYPE_CHAR;
 265 }
 266
 267 static struct fd *file_get_fd( struct object *obj )
 268 {
 269     struct file *file = (struct file *)obj;
 270     assert( obj->ops == &file_ops );
 271     return (struct fd *)grab_object( file->fd );
 272 }
 273
 274 static unsigned int generic_file_map_access( unsigned int access )
 275 {
 276     if (access & GENERIC_READ)    access |= FILE_GENERIC_READ;
 277     if (access & GENERIC_WRITE)   access |= FILE_GENERIC_WRITE;
 278     if (access & GENERIC_EXECUTE) access |= FILE_GENERIC_EXECUTE;
 279     if (access & GENERIC_ALL)     access |= FILE_ALL_ACCESS;
 280     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 281 }
 282
 283 struct security_descriptor *mode_to_sd( mode_t mode, const SID *user, const SID *group )
 284 {
 285     struct security_descriptor *sd;
 286     size_t dacl_size;
 287     ACE_HEADER *current_ace;
 288     ACCESS_ALLOWED_ACE *aaa;
 289     ACL *dacl;
 290     SID *sid;
 291     char *ptr;
 292     const SID *world_sid = security_world_sid;
 293     const SID *local_system_sid = security_local_system_sid;
 294
 295     dacl_size = sizeof(ACL) + FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
 296         FIELD_OFFSET(SID, SubAuthority[local_system_sid->SubAuthorityCount]);
 297     if (mode & S_IRWXU)
 298         dacl_size += FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
 299             FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
 300     if ((!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) ||
 301         (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) ||
 302         (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH))))
 303         dacl_size += FIELD_OFFSET(ACCESS_DENIED_ACE, SidStart) +
 304             FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
 305     if (mode & S_IRWXO)
 306         dacl_size += FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
 307             FIELD_OFFSET(SID, SubAuthority[world_sid->SubAuthorityCount]);
 308
 309     sd = mem_alloc( sizeof(struct security_descriptor) +
 310                     FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) +
 311                     FIELD_OFFSET(SID, SubAuthority[group->SubAuthorityCount]) +
 312                     dacl_size );
 313     if (!sd) return sd;
 314
 315     sd->control = SE_DACL_PRESENT;
 316     sd->owner_len = FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
 317     sd->group_len = FIELD_OFFSET(SID, SubAuthority[group->SubAuthorityCount]);
 318     sd->sacl_len = 0;
 319     sd->dacl_len = dacl_size;
 320
 321     ptr = (char *)(sd + 1);
 322     memcpy( ptr, user, sd->owner_len );
 323     ptr += sd->owner_len;
 324     memcpy( ptr, group, sd->group_len );
 325     ptr += sd->group_len;
 326
 327     dacl = (ACL *)ptr;
 328     dacl->AclRevision = ACL_REVISION;
 329     dacl->Sbz1 = 0;
 330     dacl->AclSize = dacl_size;
 331     dacl->AceCount = 1 + (mode & S_IRWXU ? 1 : 0) + (mode & S_IRWXO ? 1 : 0);
 332     if ((!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) ||
 333         (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) ||
 334         (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH))))
 335         dacl->AceCount++;
 336     dacl->Sbz2 = 0;
 337
 338     /* always give FILE_ALL_ACCESS for Local System */
 339     aaa = (ACCESS_ALLOWED_ACE *)(dacl + 1);
 340     current_ace = &aaa->Header;
 341     aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 342     aaa->Header.AceFlags = 0;
 343     aaa->Header.AceSize = FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
 344         FIELD_OFFSET(SID, SubAuthority[local_system_sid->SubAuthorityCount]);
 345     aaa->Mask = FILE_ALL_ACCESS;
 346     sid = (SID *)&aaa->SidStart;
 347     memcpy( sid, local_system_sid, FIELD_OFFSET(SID, SubAuthority[local_system_sid->SubAuthorityCount]) );
 348
 349     if (mode & S_IRWXU)
 350     {
 351         /* appropriate access rights for the user */
 352         aaa = (ACCESS_ALLOWED_ACE *)ace_next( current_ace );
 353         current_ace = &aaa->Header;
 354         aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 355         aaa->Header.AceFlags = 0;
 356         aaa->Header.AceSize = FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
 357                               FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
 358         aaa->Mask = WRITE_DAC | WRITE_OWNER;
 359         if (mode & S_IRUSR)
 360             aaa->Mask |= FILE_GENERIC_READ;
 361         if (mode & S_IWUSR)
 362             aaa->Mask |= FILE_GENERIC_WRITE | DELETE;
 363         if (mode & S_IXUSR)
 364             aaa->Mask |= FILE_GENERIC_EXECUTE;
 365         sid = (SID *)&aaa->SidStart;
 366         memcpy( sid, user, FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) );
 367     }
 368     if ((!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) ||
 369         (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) ||
 370         (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH))))
 371     {
 372         /* deny just in case the user is a member of the group */
 373         ACCESS_DENIED_ACE *ada = (ACCESS_DENIED_ACE *)ace_next( current_ace );
 374         current_ace = &ada->Header;
 375         ada->Header.AceType = ACCESS_DENIED_ACE_TYPE;
 376         ada->Header.AceFlags = 0;
 377         ada->Header.AceSize = FIELD_OFFSET(ACCESS_DENIED_ACE, SidStart) +
 378                               FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
 379         ada->Mask = 0;
 380         if (!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH)))
 381             ada->Mask |= FILE_GENERIC_READ;
 382         if (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IROTH)))
 383             ada->Mask |= FILE_GENERIC_WRITE | DELETE;
 384         if (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH)))
 385             ada->Mask |= FILE_GENERIC_EXECUTE;
 386         ada->Mask &= ~STANDARD_RIGHTS_ALL; /* never deny standard rights */
 387         sid = (SID *)&ada->SidStart;
 388         memcpy( sid, user, FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) );
 389     }
 390     if (mode & S_IRWXO)
 391     {
 392         /* appropriate access rights for Everyone */
 393         aaa = (ACCESS_ALLOWED_ACE *)ace_next( current_ace );
 394         current_ace = &aaa->Header;
 395         aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 396         aaa->Header.AceFlags = 0;
 397         aaa->Header.AceSize = FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
 398                              FIELD_OFFSET(SID, SubAuthority[world_sid->SubAuthorityCount]);
 399         aaa->Mask = 0;
 400         if (mode & S_IROTH)
 401             aaa->Mask |= FILE_GENERIC_READ;
 402         if (mode & S_IWOTH)
 403             aaa->Mask |= FILE_GENERIC_WRITE | DELETE;
 404         if (mode & S_IXOTH)
 405             aaa->Mask |= FILE_GENERIC_EXECUTE;
 406         sid = (SID *)&aaa->SidStart;
 407         memcpy( sid, world_sid, FIELD_OFFSET(SID, SubAuthority[world_sid->SubAuthorityCount]) );
 408     }
 409
 410     return sd;
 411 }
 412
 413 static struct security_descriptor *file_get_sd( struct object *obj )
 414 {
 415     struct file *file = (struct file *)obj;
 416     struct stat st;
 417     int unix_fd;
 418     struct security_descriptor *sd;
 419
 420     assert( obj->ops == &file_ops );
 421
 422     unix_fd = get_file_unix_fd( file );
 423
 424     if (unix_fd == -1 || fstat( unix_fd, &st ) == -1)
 425         return obj->sd;
 426
 427     /* mode and uid the same? if so, no need to re-generate security descriptor */
 428     if (obj->sd && (st.st_mode & (S_IRWXU|S_IRWXO)) == (file->mode & (S_IRWXU|S_IRWXO)) &&
 429         (st.st_uid == file->uid))
 430         return obj->sd;
 431
 432     sd = mode_to_sd( st.st_mode,
 433                      security_unix_uid_to_sid( st.st_uid ),
 434                      token_get_primary_group( current->process->token ));
 435     if (!sd) return obj->sd;
 436
 437     file->mode = st.st_mode;
 438     file->uid = st.st_uid;
 439     free( obj->sd );
 440     obj->sd = sd;
 441     return sd;
 442 }
 443
 444 static mode_t file_access_to_mode( unsigned int access )
 445 {
 446     mode_t mode = 0;
 447
 448     access = generic_file_map_access( access );
 449     if (access & FILE_READ_DATA)  mode |= 4;
 450     if (access & FILE_WRITE_DATA) mode |= 2;
 451     if (access & FILE_EXECUTE)    mode |= 1;
 452     return mode;
 453 }
 454
 455 mode_t sd_to_mode( const struct security_descriptor *sd, const SID *owner )
 456 {
 457     mode_t new_mode = 0;
 458     mode_t denied_mode = 0;
 459     mode_t mode;
 460     int present;
 461     const ACL *dacl = sd_get_dacl( sd, &present );
 462     const SID *user = token_get_user( current->process->token );
 463     if (present && dacl)
 464     {
 465         const ACE_HEADER *ace = (const ACE_HEADER *)(dacl + 1);
 466         ULONG i;
 467         for (i = 0; i < dacl->AceCount; i++, ace = ace_next( ace ))
 468         {
 469             const ACCESS_ALLOWED_ACE *aa_ace;
 470             const ACCESS_DENIED_ACE *ad_ace;
 471             const SID *sid;
 472
 473             if (ace->AceFlags & INHERIT_ONLY_ACE) continue;
 474
 475             switch (ace->AceType)
 476             {
 477                 case ACCESS_DENIED_ACE_TYPE:
 478                     ad_ace = (const ACCESS_DENIED_ACE *)ace;
 479                     sid = (const SID *)&ad_ace->SidStart;
 480                     mode = file_access_to_mode( ad_ace->Mask );
 481                     if (security_equal_sid( sid, security_world_sid ))
 482                     {
 483                         denied_mode |= (mode << 6) | (mode << 3) | mode; /* all */
 484                     }
 485                     else if (security_equal_sid( sid, owner ))
 486                     {
 487                         denied_mode |= (mode << 6);  /* user only */
 488                     }
 489                     else if ((security_equal_sid( user, owner ) &&
 490                               token_sid_present( current->process->token, sid, TRUE )))
 491                     {
 492                         denied_mode |= (mode << 6) | (mode << 3);  /* user + group */
 493                     }
 494                     break;
 495                 case ACCESS_ALLOWED_ACE_TYPE:
 496                     aa_ace = (const ACCESS_ALLOWED_ACE *)ace;
 497                     sid = (const SID *)&aa_ace->SidStart;
 498                     mode = file_access_to_mode( aa_ace->Mask );
 499                     if (security_equal_sid( sid, security_world_sid ))
 500                     {
 501                         new_mode |= (mode << 6) | (mode << 3) | mode;  /* all */
 502                     }
 503                     else if (security_equal_sid( sid, owner ))
 504                     {
 505                         new_mode |= (mode << 6);  /* user only */
 506                     }
 507                     else if ((security_equal_sid( user, owner ) &&
 508                               token_sid_present( current->process->token, sid, FALSE )))
 509                     {
 510                         new_mode |= (mode << 6) | (mode << 3);  /* user + group */
 511                     }
 512                     break;
 513             }
 514         }
 515     }
 516     else
 517         /* no ACL means full access rights to anyone */
 518         new_mode = S_IRWXU | S_IRWXG | S_IRWXO;
 519
 520     return new_mode & ~denied_mode;
 521 }
 522
 523 static int file_set_sd( struct object *obj, const struct security_descriptor *sd,
 524                         unsigned int set_info )
 525 {
 526     struct file *file = (struct file *)obj;
 527     const SID *owner;
 528     struct stat st;
 529     mode_t mode;
 530     int unix_fd;
 531
 532     assert( obj->ops == &file_ops );
 533
 534     unix_fd = get_file_unix_fd( file );
 535
 536     if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 1;
 537
 538     if (set_info & OWNER_SECURITY_INFORMATION)
 539     {
 540         owner = sd_get_owner( sd );
 541         if (!owner)
 542         {
 543             set_error( STATUS_INVALID_SECURITY_DESCR );
 544             return 0;
 545         }
 546         if (!obj->sd || !security_equal_sid( owner, sd_get_owner( obj->sd ) ))
 547         {
 548             /* FIXME: get Unix uid and call fchown */
 549         }
 550     }
 551     else if (obj->sd)
 552         owner = sd_get_owner( obj->sd );
 553     else
 554         owner = token_get_user( current->process->token );
 555
 556     /* group and sacl not supported */
 557
 558     if (set_info & DACL_SECURITY_INFORMATION)
 559     {
 560         /* keep the bits that we don't map to access rights in the ACL */
 561         mode = st.st_mode & (S_ISUID|S_ISGID|S_ISVTX);
 562         mode |= sd_to_mode( sd, owner );
 563
 564         if (((st.st_mode ^ mode) & (S_IRWXU|S_IRWXG|S_IRWXO)) && fchmod( unix_fd, mode ) == -1)
 565         {
 566             file_set_error();
 567             return 0;
 568         }
 569     }
 570     return 1;
 571 }
 572
 573 static void file_destroy( struct object *obj )
 574 {
 575     struct file *file = (struct file *)obj;
 576     assert( obj->ops == &file_ops );
 577
 578     if (file->fd) release_object( file->fd );
 579 }
 580
 581 /* set the last error depending on errno */
 582 void file_set_error(void)
 583 {
 584     switch (errno)
 585     {
 586     case ETXTBSY:
 587     case EAGAIN:    set_error( STATUS_SHARING_VIOLATION ); break;
 588     case EBADF:     set_error( STATUS_INVALID_HANDLE ); break;
 589     case ENOSPC:    set_error( STATUS_DISK_FULL ); break;
 590     case EACCES:
 591     case ESRCH:
 592     case EROFS:
 593     case EPERM:     set_error( STATUS_ACCESS_DENIED ); break;
 594     case EBUSY:     set_error( STATUS_FILE_LOCK_CONFLICT ); break;
 595     case ENOENT:    set_error( STATUS_NO_SUCH_FILE ); break;
 596     case EISDIR:    set_error( STATUS_FILE_IS_A_DIRECTORY ); break;
 597     case ENFILE:
 598     case EMFILE:    set_error( STATUS_TOO_MANY_OPENED_FILES ); break;
 599     case EEXIST:    set_error( STATUS_OBJECT_NAME_COLLISION ); break;
 600     case EINVAL:    set_error( STATUS_INVALID_PARAMETER ); break;
 601     case ESPIPE:    set_error( STATUS_ILLEGAL_FUNCTION ); break;
 602     case ENOTEMPTY: set_error( STATUS_DIRECTORY_NOT_EMPTY ); break;
 603     case EIO:       set_error( STATUS_ACCESS_VIOLATION ); break;
 604     case ENOTDIR:   set_error( STATUS_NOT_A_DIRECTORY ); break;
 605     case EFBIG:     set_error( STATUS_SECTION_TOO_BIG ); break;
 606     case ENODEV:    set_error( STATUS_NO_SUCH_DEVICE ); break;
 607     case ENXIO:     set_error( STATUS_NO_SUCH_DEVICE ); break;
 608 #ifdef EOVERFLOW
 609     case EOVERFLOW: set_error( STATUS_INVALID_PARAMETER ); break;
 610 #endif
 611     default:
 612         perror("wineserver: file_set_error() can't map error");
 613         set_error( STATUS_UNSUCCESSFUL );
 614         break;
 615     }
 616 }
 617
 618 struct file *get_file_obj( struct process *process, obj_handle_t handle, unsigned int access )
 619 {
 620     return (struct file *)get_handle_obj( process, handle, access, &file_ops );
 621 }
 622
 623 int get_file_unix_fd( struct file *file )
 624 {
 625     return get_unix_fd( file->fd );
 626 }
 627
 628 struct file *grab_file_unless_removable( struct file *file )
 629 {
 630     if (is_fd_removable( file->fd )) return NULL;
 631     return (struct file *)grab_object( file );
 632 }
 633
 634 /* create a file */
 635 DECL_HANDLER(create_file)
 636 {
 637     struct object *file;
 638     struct fd *root_fd = NULL;
 639     const struct object_attributes *objattr = get_req_data();
 640     const struct security_descriptor *sd;
 641     const char *name;
 642     data_size_t name_len;
 643
 644     reply->handle = 0;
 645
 646     if (!objattr_is_valid( objattr, get_req_data_size() ))
 647         return;
 648     /* name is transferred in the unix codepage outside of the objattr structure */
 649     if (objattr->name_len)
 650     {
 651         set_error( STATUS_INVALID_PARAMETER );
 652         return;
 653     }
 654
 655     if (objattr->rootdir)
 656     {
 657         struct dir *root;
 658
 659         if (!(root = get_dir_obj( current->process, objattr->rootdir, 0 ))) return;
 660         root_fd = get_obj_fd( (struct object *)root );
 661         release_object( root );
 662         if (!root_fd) return;
 663     }
 664
 665     sd = objattr->sd_len ? (const struct security_descriptor *)(objattr + 1) : NULL;
 666
 667     name = (const char *)get_req_data() + sizeof(*objattr) + objattr->sd_len;
 668     name_len = get_req_data_size() - sizeof(*objattr) - objattr->sd_len;
 669
 670     reply->handle = 0;
 671     if ((file = create_file( root_fd, name, name_len, req->access, req->sharing,
 672                              req->create, req->options, req->attrs, sd )))
 673     {
 674         reply->handle = alloc_handle( current->process, file, req->access, req->attributes );
 675         release_object( file );
 676     }
 677     if (root_fd) release_object( root_fd );
 678 }
 679
 680 /* allocate a file handle for a Unix fd */
 681 DECL_HANDLER(alloc_file_handle)
 682 {
 683     struct file *file;
 684     int fd;
 685
 686     reply->handle = 0;
 687     if ((fd = thread_get_inflight_fd( current, req->fd )) == -1)
 688     {
 689         set_error( STATUS_INVALID_HANDLE );
 690         return;
 691     }
 692     if ((file = create_file_for_fd( fd, req->access, FILE_SHARE_READ | FILE_SHARE_WRITE )))
 693     {
 694         reply->handle = alloc_handle( current->process, file, req->access, req->attributes );
 695         release_object( file );
 696     }
 697 }
 698
 699 /* lock a region of a file */
 700 DECL_HANDLER(lock_file)
 701 {
 702     struct file *file;
 703
 704     if ((file = get_file_obj( current->process, req->handle, 0 )))
 705     {
 706         reply->handle = lock_fd( file->fd, req->offset, req->count, req->shared, req->wait );
 707         reply->overlapped = is_overlapped( file );
 708         release_object( file );
 709     }
 710 }
 711
 712 /* unlock a region of a file */
 713 DECL_HANDLER(unlock_file)
 714 {
 715     struct file *file;
 716
 717     if ((file = get_file_obj( current->process, req->handle, 0 )))
 718     {
 719         unlock_fd( file->fd, req->offset, req->count );
 720         release_object( file );
 721     }
 722 }