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