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