1/* 2 Unix SMB/CIFS implementation. 3 SMB NT Security Descriptor / Unix permission conversion. 4 Copyright (C) Jeremy Allison 1994-2009. 5 Copyright (C) Andreas Gruenbacher 2002. 6 Copyright (C) Simo Sorce <idra@samba.org> 2009. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program. If not, see <http://www.gnu.org/licenses/>. 20*/ 21 22#include "includes.h" 23 24extern struct current_user current_user; 25extern const struct generic_mapping file_generic_mapping; 26 27#undef DBGC_CLASS 28#define DBGC_CLASS DBGC_ACLS 29 30/**************************************************************************** 31 Data structures representing the internal ACE format. 32****************************************************************************/ 33 34enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE}; 35enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */ 36 37typedef union posix_id { 38 uid_t uid; 39 gid_t gid; 40 int world; 41} posix_id; 42 43typedef struct canon_ace { 44 struct canon_ace *next, *prev; 45 SMB_ACL_TAG_T type; 46 mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */ 47 DOM_SID trustee; 48 enum ace_owner owner_type; 49 enum ace_attribute attr; 50 posix_id unix_ug; 51 uint8_t ace_flags; /* From windows ACE entry. */ 52} canon_ace; 53 54#define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR) 55 56/* 57 * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance) 58 * attribute on disk - version 1. 59 * All values are little endian. 60 * 61 * | 1 | 1 | 2 | 2 | .... 62 * +------+------+-------------+---------------------+-------------+--------------------+ 63 * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... | 64 * +------+------+-------------+---------------------+-------------+--------------------+ 65 * 66 * Entry format is : 67 * 68 * | 1 | 4 | 69 * +------+-------------------+ 70 * | value| uid/gid or world | 71 * | type | value | 72 * +------+-------------------+ 73 * 74 * Version 2 format. Stores extra Windows metadata about an ACL. 75 * 76 * | 1 | 2 | 2 | 2 | .... 77 * +------+----------+-------------+---------------------+-------------+--------------------+ 78 * | vers | ace | num_entries | num_default_entries | ..entries.. | default_entries... | 79 * | 2 | type | | | | | 80 * +------+----------+-------------+---------------------+-------------+--------------------+ 81 * 82 * Entry format is : 83 * 84 * | 1 | 1 | 4 | 85 * +------+------+-------------------+ 86 * | ace | value| uid/gid or world | 87 * | flag | type | value | 88 * +------+-------------------+------+ 89 * 90 */ 91 92#define PAI_VERSION_OFFSET 0 93 94#define PAI_V1_FLAG_OFFSET 1 95#define PAI_V1_NUM_ENTRIES_OFFSET 2 96#define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET 4 97#define PAI_V1_ENTRIES_BASE 6 98#define PAI_V1_ACL_FLAG_PROTECTED 0x1 99#define PAI_V1_ENTRY_LENGTH 5 100 101#define PAI_V1_VERSION 1 102 103#define PAI_V2_TYPE_OFFSET 1 104#define PAI_V2_NUM_ENTRIES_OFFSET 3 105#define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET 5 106#define PAI_V2_ENTRIES_BASE 7 107#define PAI_V2_ENTRY_LENGTH 6 108 109#define PAI_V2_VERSION 2 110 111/* 112 * In memory format of user.SAMBA_PAI attribute. 113 */ 114 115struct pai_entry { 116 struct pai_entry *next, *prev; 117 uint8_t ace_flags; 118 enum ace_owner owner_type; 119 posix_id unix_ug; 120}; 121 122struct pai_val { 123 uint16_t sd_type; 124 unsigned int num_entries; 125 struct pai_entry *entry_list; 126 unsigned int num_def_entries; 127 struct pai_entry *def_entry_list; 128}; 129 130/************************************************************************ 131 Return a uint32 of the pai_entry principal. 132************************************************************************/ 133 134static uint32_t get_pai_entry_val(struct pai_entry *paie) 135{ 136 switch (paie->owner_type) { 137 case UID_ACE: 138 DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid )); 139 return (uint32_t)paie->unix_ug.uid; 140 case GID_ACE: 141 DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid )); 142 return (uint32_t)paie->unix_ug.gid; 143 case WORLD_ACE: 144 default: 145 DEBUG(10,("get_pai_entry_val: world ace\n")); 146 return (uint32_t)-1; 147 } 148} 149 150/************************************************************************ 151 Return a uint32 of the entry principal. 152************************************************************************/ 153 154static uint32_t get_entry_val(canon_ace *ace_entry) 155{ 156 switch (ace_entry->owner_type) { 157 case UID_ACE: 158 DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid )); 159 return (uint32_t)ace_entry->unix_ug.uid; 160 case GID_ACE: 161 DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid )); 162 return (uint32_t)ace_entry->unix_ug.gid; 163 case WORLD_ACE: 164 default: 165 DEBUG(10,("get_entry_val: world ace\n")); 166 return (uint32_t)-1; 167 } 168} 169 170/************************************************************************ 171 Create the on-disk format (always v2 now). Caller must free. 172************************************************************************/ 173 174static char *create_pai_buf_v2(canon_ace *file_ace_list, 175 canon_ace *dir_ace_list, 176 uint16_t sd_type, 177 size_t *store_size) 178{ 179 char *pai_buf = NULL; 180 canon_ace *ace_list = NULL; 181 char *entry_offset = NULL; 182 unsigned int num_entries = 0; 183 unsigned int num_def_entries = 0; 184 unsigned int i; 185 186 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) { 187 num_entries++; 188 } 189 190 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) { 191 num_def_entries++; 192 } 193 194 DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries )); 195 196 *store_size = PAI_V2_ENTRIES_BASE + 197 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH); 198 199 pai_buf = (char *)SMB_MALLOC(*store_size); 200 if (!pai_buf) { 201 return NULL; 202 } 203 204 /* Set up the header. */ 205 memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE); 206 SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION); 207 SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type); 208 SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries); 209 SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries); 210 211 DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n", 212 (unsigned int)sd_type )); 213 214 entry_offset = pai_buf + PAI_V2_ENTRIES_BASE; 215 216 i = 0; 217 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) { 218 uint8_t type_val = (uint8_t)ace_list->owner_type; 219 uint32_t entry_val = get_entry_val(ace_list); 220 221 SCVAL(entry_offset,0,ace_list->ace_flags); 222 SCVAL(entry_offset,1,type_val); 223 SIVAL(entry_offset,2,entry_val); 224 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n", 225 i, 226 (unsigned int)ace_list->ace_flags, 227 (unsigned int)type_val, 228 (unsigned int)entry_val )); 229 i++; 230 entry_offset += PAI_V2_ENTRY_LENGTH; 231 } 232 233 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) { 234 uint8_t type_val = (uint8_t)ace_list->owner_type; 235 uint32_t entry_val = get_entry_val(ace_list); 236 237 SCVAL(entry_offset,0,ace_list->ace_flags); 238 SCVAL(entry_offset,1,type_val); 239 SIVAL(entry_offset,2,entry_val); 240 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n", 241 i, 242 (unsigned int)ace_list->ace_flags, 243 (unsigned int)type_val, 244 (unsigned int)entry_val )); 245 i++; 246 entry_offset += PAI_V2_ENTRY_LENGTH; 247 } 248 249 return pai_buf; 250} 251 252/************************************************************************ 253 Store the user.SAMBA_PAI attribute on disk. 254************************************************************************/ 255 256static void store_inheritance_attributes(files_struct *fsp, 257 canon_ace *file_ace_list, 258 canon_ace *dir_ace_list, 259 uint16_t sd_type) 260{ 261 int ret; 262 size_t store_size; 263 char *pai_buf; 264 265 if (!lp_map_acl_inherit(SNUM(fsp->conn))) { 266 return; 267 } 268 269 pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list, 270 sd_type, &store_size); 271 272 if (fsp->fh->fd != -1) { 273 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME, 274 pai_buf, store_size, 0); 275 } else { 276 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name, 277 SAMBA_POSIX_INHERITANCE_EA_NAME, 278 pai_buf, store_size, 0); 279 } 280 281 SAFE_FREE(pai_buf); 282 283 DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n", 284 (unsigned int)sd_type, 285 fsp_str_dbg(fsp))); 286 287 if (ret == -1 && !no_acl_syscall_error(errno)) { 288 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) )); 289 } 290} 291 292/************************************************************************ 293 Delete the in memory inheritance info. 294************************************************************************/ 295 296static void free_inherited_info(struct pai_val *pal) 297{ 298 if (pal) { 299 struct pai_entry *paie, *paie_next; 300 for (paie = pal->entry_list; paie; paie = paie_next) { 301 paie_next = paie->next; 302 SAFE_FREE(paie); 303 } 304 for (paie = pal->def_entry_list; paie; paie = paie_next) { 305 paie_next = paie->next; 306 SAFE_FREE(paie); 307 } 308 SAFE_FREE(pal); 309 } 310} 311 312/************************************************************************ 313 Get any stored ACE flags. 314************************************************************************/ 315 316static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace) 317{ 318 struct pai_entry *paie; 319 320 if (!pal) { 321 return 0; 322 } 323 324 /* If the entry exists it is inherited. */ 325 for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) { 326 if (ace_entry->owner_type == paie->owner_type && 327 get_entry_val(ace_entry) == get_pai_entry_val(paie)) 328 return paie->ace_flags; 329 } 330 return 0; 331} 332 333/************************************************************************ 334 Ensure an attribute just read is valid - v1. 335************************************************************************/ 336 337static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size) 338{ 339 uint16 num_entries; 340 uint16 num_def_entries; 341 342 if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) { 343 /* Corrupted - too small. */ 344 return false; 345 } 346 347 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) { 348 return false; 349 } 350 351 num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET); 352 num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET); 353 354 /* Check the entry lists match. */ 355 /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */ 356 357 if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) + 358 PAI_V1_ENTRIES_BASE != pai_buf_data_size) { 359 return false; 360 } 361 362 return true; 363} 364 365/************************************************************************ 366 Ensure an attribute just read is valid - v2. 367************************************************************************/ 368 369static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size) 370{ 371 uint16 num_entries; 372 uint16 num_def_entries; 373 374 if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) { 375 /* Corrupted - too small. */ 376 return false; 377 } 378 379 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) { 380 return false; 381 } 382 383 num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET); 384 num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET); 385 386 /* Check the entry lists match. */ 387 /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */ 388 389 if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) + 390 PAI_V2_ENTRIES_BASE != pai_buf_data_size) { 391 return false; 392 } 393 394 return true; 395} 396 397/************************************************************************ 398 Decode the owner. 399************************************************************************/ 400 401static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset) 402{ 403 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0); 404 switch( paie->owner_type) { 405 case UID_ACE: 406 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1); 407 DEBUG(10,("get_pai_owner_type: uid = %u\n", 408 (unsigned int)paie->unix_ug.uid )); 409 break; 410 case GID_ACE: 411 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1); 412 DEBUG(10,("get_pai_owner_type: gid = %u\n", 413 (unsigned int)paie->unix_ug.gid )); 414 break; 415 case WORLD_ACE: 416 paie->unix_ug.world = -1; 417 DEBUG(10,("get_pai_owner_type: world ace\n")); 418 break; 419 default: 420 DEBUG(10,("get_pai_owner_type: unknown type %u\n", 421 (unsigned int)paie->owner_type )); 422 return false; 423 } 424 return true; 425} 426 427/************************************************************************ 428 Process v2 entries. 429************************************************************************/ 430 431static const char *create_pai_v1_entries(struct pai_val *paiv, 432 const char *entry_offset, 433 bool def_entry) 434{ 435 int i; 436 437 for (i = 0; i < paiv->num_entries; i++) { 438 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry); 439 if (!paie) { 440 return NULL; 441 } 442 443 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE; 444 if (!get_pai_owner_type(paie, entry_offset)) { 445 return NULL; 446 } 447 448 if (!def_entry) { 449 DLIST_ADD(paiv->entry_list, paie); 450 } else { 451 DLIST_ADD(paiv->def_entry_list, paie); 452 } 453 entry_offset += PAI_V1_ENTRY_LENGTH; 454 } 455 return entry_offset; 456} 457 458/************************************************************************ 459 Convert to in-memory format from version 1. 460************************************************************************/ 461 462static struct pai_val *create_pai_val_v1(const char *buf, size_t size) 463{ 464 const char *entry_offset; 465 struct pai_val *paiv = NULL; 466 467 if (!check_pai_ok_v1(buf, size)) { 468 return NULL; 469 } 470 471 paiv = SMB_MALLOC_P(struct pai_val); 472 if (!paiv) { 473 return NULL; 474 } 475 476 memset(paiv, '\0', sizeof(struct pai_val)); 477 478 paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ? 479 SE_DESC_DACL_PROTECTED : 0; 480 481 paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET); 482 paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET); 483 484 entry_offset = buf + PAI_V1_ENTRIES_BASE; 485 486 DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n", 487 paiv->num_entries, paiv->num_def_entries )); 488 489 entry_offset = create_pai_v1_entries(paiv, entry_offset, false); 490 if (entry_offset == NULL) { 491 free_inherited_info(paiv); 492 return NULL; 493 } 494 entry_offset = create_pai_v1_entries(paiv, entry_offset, true); 495 if (entry_offset == NULL) { 496 free_inherited_info(paiv); 497 return NULL; 498 } 499 500 return paiv; 501} 502 503/************************************************************************ 504 Process v2 entries. 505************************************************************************/ 506 507static const char *create_pai_v2_entries(struct pai_val *paiv, 508 unsigned int num_entries, 509 const char *entry_offset, 510 bool def_entry) 511{ 512 unsigned int i; 513 514 for (i = 0; i < num_entries; i++) { 515 struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry); 516 if (!paie) { 517 return NULL; 518 } 519 520 paie->ace_flags = CVAL(entry_offset,0); 521 522 if (!get_pai_owner_type(paie, entry_offset+1)) { 523 return NULL; 524 } 525 if (!def_entry) { 526 DLIST_ADD(paiv->entry_list, paie); 527 } else { 528 DLIST_ADD(paiv->def_entry_list, paie); 529 } 530 entry_offset += PAI_V2_ENTRY_LENGTH; 531 } 532 return entry_offset; 533} 534 535/************************************************************************ 536 Convert to in-memory format from version 2. 537************************************************************************/ 538 539static struct pai_val *create_pai_val_v2(const char *buf, size_t size) 540{ 541 const char *entry_offset; 542 struct pai_val *paiv = NULL; 543 544 if (!check_pai_ok_v2(buf, size)) { 545 return NULL; 546 } 547 548 paiv = SMB_MALLOC_P(struct pai_val); 549 if (!paiv) { 550 return NULL; 551 } 552 553 memset(paiv, '\0', sizeof(struct pai_val)); 554 555 paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET); 556 557 paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET); 558 paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET); 559 560 entry_offset = buf + PAI_V2_ENTRIES_BASE; 561 562 DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n", 563 (unsigned int)paiv->sd_type, 564 paiv->num_entries, paiv->num_def_entries )); 565 566 entry_offset = create_pai_v2_entries(paiv, paiv->num_entries, 567 entry_offset, false); 568 if (entry_offset == NULL) { 569 free_inherited_info(paiv); 570 return NULL; 571 } 572 entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries, 573 entry_offset, true); 574 if (entry_offset == NULL) { 575 free_inherited_info(paiv); 576 return NULL; 577 } 578 579 return paiv; 580} 581 582/************************************************************************ 583 Convert to in-memory format - from either version 1 or 2. 584************************************************************************/ 585 586static struct pai_val *create_pai_val(const char *buf, size_t size) 587{ 588 if (size < 1) { 589 return NULL; 590 } 591 if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) { 592 return create_pai_val_v1(buf, size); 593 } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) { 594 return create_pai_val_v2(buf, size); 595 } else { 596 return NULL; 597 } 598} 599 600/************************************************************************ 601 Load the user.SAMBA_PAI attribute. 602************************************************************************/ 603 604static struct pai_val *fload_inherited_info(files_struct *fsp) 605{ 606 char *pai_buf; 607 size_t pai_buf_size = 1024; 608 struct pai_val *paiv = NULL; 609 ssize_t ret; 610 611 if (!lp_map_acl_inherit(SNUM(fsp->conn))) { 612 return NULL; 613 } 614 615 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) { 616 return NULL; 617 } 618 619 do { 620 if (fsp->fh->fd != -1) { 621 ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME, 622 pai_buf, pai_buf_size); 623 } else { 624 ret = SMB_VFS_GETXATTR(fsp->conn, 625 fsp->fsp_name->base_name, 626 SAMBA_POSIX_INHERITANCE_EA_NAME, 627 pai_buf, pai_buf_size); 628 } 629 630 if (ret == -1) { 631 if (errno != ERANGE) { 632 break; 633 } 634 /* Buffer too small - enlarge it. */ 635 pai_buf_size *= 2; 636 SAFE_FREE(pai_buf); 637 if (pai_buf_size > 1024*1024) { 638 return NULL; /* Limit malloc to 1mb. */ 639 } 640 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) 641 return NULL; 642 } 643 } while (ret == -1); 644 645 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", 646 (unsigned long)ret, fsp_str_dbg(fsp))); 647 648 if (ret == -1) { 649 /* No attribute or not supported. */ 650#if defined(ENOATTR) 651 if (errno != ENOATTR) 652 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) )); 653#else 654 if (errno != ENOSYS) 655 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) )); 656#endif 657 SAFE_FREE(pai_buf); 658 return NULL; 659 } 660 661 paiv = create_pai_val(pai_buf, ret); 662 663 if (paiv) { 664 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n", 665 (unsigned int)paiv->sd_type, fsp_str_dbg(fsp))); 666 } 667 668 SAFE_FREE(pai_buf); 669 return paiv; 670} 671 672/************************************************************************ 673 Load the user.SAMBA_PAI attribute. 674************************************************************************/ 675 676static struct pai_val *load_inherited_info(const struct connection_struct *conn, 677 const char *fname) 678{ 679 char *pai_buf; 680 size_t pai_buf_size = 1024; 681 struct pai_val *paiv = NULL; 682 ssize_t ret; 683 684 if (!lp_map_acl_inherit(SNUM(conn))) { 685 return NULL; 686 } 687 688 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) { 689 return NULL; 690 } 691 692 do { 693 ret = SMB_VFS_GETXATTR(conn, fname, 694 SAMBA_POSIX_INHERITANCE_EA_NAME, 695 pai_buf, pai_buf_size); 696 697 if (ret == -1) { 698 if (errno != ERANGE) { 699 break; 700 } 701 /* Buffer too small - enlarge it. */ 702 pai_buf_size *= 2; 703 SAFE_FREE(pai_buf); 704 if (pai_buf_size > 1024*1024) { 705 return NULL; /* Limit malloc to 1mb. */ 706 } 707 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) 708 return NULL; 709 } 710 } while (ret == -1); 711 712 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname)); 713 714 if (ret == -1) { 715 /* No attribute or not supported. */ 716#if defined(ENOATTR) 717 if (errno != ENOATTR) 718 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) )); 719#else 720 if (errno != ENOSYS) 721 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) )); 722#endif 723 SAFE_FREE(pai_buf); 724 return NULL; 725 } 726 727 paiv = create_pai_val(pai_buf, ret); 728 729 if (paiv) { 730 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n", 731 (unsigned int)paiv->sd_type, 732 fname)); 733 } 734 735 SAFE_FREE(pai_buf); 736 return paiv; 737} 738 739/**************************************************************************** 740 Functions to manipulate the internal ACE format. 741****************************************************************************/ 742 743/**************************************************************************** 744 Count a linked list of canonical ACE entries. 745****************************************************************************/ 746 747static size_t count_canon_ace_list( canon_ace *l_head ) 748{ 749 size_t count = 0; 750 canon_ace *ace; 751 752 for (ace = l_head; ace; ace = ace->next) 753 count++; 754 755 return count; 756} 757 758/**************************************************************************** 759 Free a linked list of canonical ACE entries. 760****************************************************************************/ 761 762static void free_canon_ace_list( canon_ace *l_head ) 763{ 764 canon_ace *list, *next; 765 766 for (list = l_head; list; list = next) { 767 next = list->next; 768 DLIST_REMOVE(l_head, list); 769 SAFE_FREE(list); 770 } 771} 772 773/**************************************************************************** 774 Function to duplicate a canon_ace entry. 775****************************************************************************/ 776 777static canon_ace *dup_canon_ace( canon_ace *src_ace) 778{ 779 canon_ace *dst_ace = SMB_MALLOC_P(canon_ace); 780 781 if (dst_ace == NULL) 782 return NULL; 783 784 *dst_ace = *src_ace; 785 dst_ace->prev = dst_ace->next = NULL; 786 return dst_ace; 787} 788 789/**************************************************************************** 790 Print out a canon ace. 791****************************************************************************/ 792 793static void print_canon_ace(canon_ace *pace, int num) 794{ 795 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" ); 796 dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee)); 797 if (pace->owner_type == UID_ACE) { 798 const char *u_name = uidtoname(pace->unix_ug.uid); 799 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name ); 800 } else if (pace->owner_type == GID_ACE) { 801 char *g_name = gidtoname(pace->unix_ug.gid); 802 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name ); 803 } else 804 dbgtext( "other "); 805 switch (pace->type) { 806 case SMB_ACL_USER: 807 dbgtext( "SMB_ACL_USER "); 808 break; 809 case SMB_ACL_USER_OBJ: 810 dbgtext( "SMB_ACL_USER_OBJ "); 811 break; 812 case SMB_ACL_GROUP: 813 dbgtext( "SMB_ACL_GROUP "); 814 break; 815 case SMB_ACL_GROUP_OBJ: 816 dbgtext( "SMB_ACL_GROUP_OBJ "); 817 break; 818 case SMB_ACL_OTHER: 819 dbgtext( "SMB_ACL_OTHER "); 820 break; 821 default: 822 dbgtext( "MASK " ); 823 break; 824 } 825 826 dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags); 827 dbgtext( "perms "); 828 dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-'); 829 dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-'); 830 dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-'); 831} 832 833/**************************************************************************** 834 Print out a canon ace list. 835****************************************************************************/ 836 837static void print_canon_ace_list(const char *name, canon_ace *ace_list) 838{ 839 int count = 0; 840 841 if( DEBUGLVL( 10 )) { 842 dbgtext( "print_canon_ace_list: %s\n", name ); 843 for (;ace_list; ace_list = ace_list->next, count++) 844 print_canon_ace(ace_list, count ); 845 } 846} 847 848/**************************************************************************** 849 Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits). 850****************************************************************************/ 851 852static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset) 853{ 854 mode_t ret = 0; 855 856 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0); 857 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0); 858 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0); 859 860 return ret; 861} 862 863/**************************************************************************** 864 Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits). 865****************************************************************************/ 866 867static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask) 868{ 869 mode_t ret = 0; 870 871 if (mode & r_mask) 872 ret |= S_IRUSR; 873 if (mode & w_mask) 874 ret |= S_IWUSR; 875 if (mode & x_mask) 876 ret |= S_IXUSR; 877 878 return ret; 879} 880 881/**************************************************************************** 882 Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to 883 an SMB_ACL_PERMSET_T. 884****************************************************************************/ 885 886static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset) 887{ 888 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) 889 return -1; 890 if (mode & S_IRUSR) { 891 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) 892 return -1; 893 } 894 if (mode & S_IWUSR) { 895 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) 896 return -1; 897 } 898 if (mode & S_IXUSR) { 899 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) 900 return -1; 901 } 902 return 0; 903} 904 905/**************************************************************************** 906 Function to create owner and group SIDs from a SMB_STRUCT_STAT. 907****************************************************************************/ 908 909void create_file_sids(const SMB_STRUCT_STAT *psbuf, DOM_SID *powner_sid, DOM_SID *pgroup_sid) 910{ 911 uid_to_sid( powner_sid, psbuf->st_ex_uid ); 912 gid_to_sid( pgroup_sid, psbuf->st_ex_gid ); 913} 914 915/**************************************************************************** 916 Merge aces with a common sid - if both are allow or deny, OR the permissions together and 917 delete the second one. If the first is deny, mask the permissions off and delete the allow 918 if the permissions become zero, delete the deny if the permissions are non zero. 919****************************************************************************/ 920 921static void merge_aces( canon_ace **pp_list_head, bool dir_acl) 922{ 923 canon_ace *l_head = *pp_list_head; 924 canon_ace *curr_ace_outer; 925 canon_ace *curr_ace_outer_next; 926 927 /* 928 * First, merge allow entries with identical SIDs, and deny entries 929 * with identical SIDs. 930 */ 931 932 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) { 933 canon_ace *curr_ace; 934 canon_ace *curr_ace_next; 935 936 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */ 937 938 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) { 939 bool can_merge = false; 940 941 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */ 942 943 /* For file ACLs we can merge if the SIDs and ALLOW/DENY 944 * types are the same. For directory acls we must also 945 * ensure the POSIX ACL types are the same. */ 946 947 if (!dir_acl) { 948 can_merge = (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) && 949 (curr_ace->attr == curr_ace_outer->attr)); 950 } else { 951 can_merge = (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) && 952 (curr_ace->type == curr_ace_outer->type) && 953 (curr_ace->attr == curr_ace_outer->attr)); 954 } 955 956 if (can_merge) { 957 if( DEBUGLVL( 10 )) { 958 dbgtext("merge_aces: Merging ACE's\n"); 959 print_canon_ace( curr_ace_outer, 0); 960 print_canon_ace( curr_ace, 0); 961 } 962 963 /* Merge two allow or two deny ACE's. */ 964 965 /* Theoretically we shouldn't merge a dir ACE if 966 * one ACE has the CI flag set, and the other 967 * ACE has the OI flag set, but this is rare 968 * enough we can ignore it. */ 969 970 curr_ace_outer->perms |= curr_ace->perms; 971 curr_ace_outer->ace_flags |= curr_ace->ace_flags; 972 DLIST_REMOVE(l_head, curr_ace); 973 SAFE_FREE(curr_ace); 974 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */ 975 } 976 } 977 } 978 979 /* 980 * Now go through and mask off allow permissions with deny permissions. 981 * We can delete either the allow or deny here as we know that each SID 982 * appears only once in the list. 983 */ 984 985 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) { 986 canon_ace *curr_ace; 987 canon_ace *curr_ace_next; 988 989 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */ 990 991 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) { 992 993 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */ 994 995 /* 996 * Subtract ACE's with different entries. Due to the ordering constraints 997 * we've put on the ACL, we know the deny must be the first one. 998 */ 999 1000 if (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) && 1001 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) { 1002 1003 if( DEBUGLVL( 10 )) { 1004 dbgtext("merge_aces: Masking ACE's\n"); 1005 print_canon_ace( curr_ace_outer, 0); 1006 print_canon_ace( curr_ace, 0); 1007 } 1008 1009 curr_ace->perms &= ~curr_ace_outer->perms; 1010 1011 if (curr_ace->perms == 0) { 1012 1013 /* 1014 * The deny overrides the allow. Remove the allow. 1015 */ 1016 1017 DLIST_REMOVE(l_head, curr_ace); 1018 SAFE_FREE(curr_ace); 1019 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */ 1020 1021 } else { 1022 1023 /* 1024 * Even after removing permissions, there 1025 * are still allow permissions - delete the deny. 1026 * It is safe to delete the deny here, 1027 * as we are guarenteed by the deny first 1028 * ordering that all the deny entries for 1029 * this SID have already been merged into one 1030 * before we can get to an allow ace. 1031 */ 1032 1033 DLIST_REMOVE(l_head, curr_ace_outer); 1034 SAFE_FREE(curr_ace_outer); 1035 break; 1036 } 1037 } 1038 1039 } /* end for curr_ace */ 1040 } /* end for curr_ace_outer */ 1041 1042 /* We may have modified the list. */ 1043 1044 *pp_list_head = l_head; 1045} 1046 1047/**************************************************************************** 1048 Check if we need to return NT4.x compatible ACL entries. 1049****************************************************************************/ 1050 1051bool nt4_compatible_acls(void) 1052{ 1053 int compat = lp_acl_compatibility(); 1054 1055 if (compat == ACL_COMPAT_AUTO) { 1056 enum remote_arch_types ra_type = get_remote_arch(); 1057 1058 /* Automatically adapt to client */ 1059 return (ra_type <= RA_WINNT); 1060 } else 1061 return (compat == ACL_COMPAT_WINNT); 1062} 1063 1064 1065/**************************************************************************** 1066 Map canon_ace perms to permission bits NT. 1067 The attr element is not used here - we only process deny entries on set, 1068 not get. Deny entries are implicit on get with ace->perms = 0. 1069****************************************************************************/ 1070 1071uint32_t map_canon_ace_perms(int snum, 1072 enum security_ace_type *pacl_type, 1073 mode_t perms, 1074 bool directory_ace) 1075{ 1076 uint32_t nt_mask = 0; 1077 1078 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED; 1079 1080 if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) { 1081 if (directory_ace) { 1082 nt_mask = UNIX_DIRECTORY_ACCESS_RWX; 1083 } else { 1084 nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS); 1085 } 1086 } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) { 1087 /* 1088 * Windows NT refuses to display ACEs with no permissions in them (but 1089 * they are perfectly legal with Windows 2000). If the ACE has empty 1090 * permissions we cannot use 0, so we use the otherwise unused 1091 * WRITE_OWNER permission, which we ignore when we set an ACL. 1092 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this 1093 * to be changed in the future. 1094 */ 1095 1096 if (nt4_compatible_acls()) 1097 nt_mask = UNIX_ACCESS_NONE; 1098 else 1099 nt_mask = 0; 1100 } else { 1101 if (directory_ace) { 1102 nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 ); 1103 nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 ); 1104 nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 ); 1105 } else { 1106 nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 ); 1107 nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 ); 1108 nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 ); 1109 } 1110 } 1111 1112 if ((perms & S_IWUSR) && lp_dos_filemode(snum)) { 1113 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS); 1114 } 1115 1116 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n", 1117 (unsigned int)perms, (unsigned int)nt_mask )); 1118 1119 return nt_mask; 1120} 1121 1122/**************************************************************************** 1123 Map NT perms to a UNIX mode_t. 1124****************************************************************************/ 1125 1126#define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES) 1127#define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES) 1128#define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE) 1129 1130static mode_t map_nt_perms( uint32 *mask, int type) 1131{ 1132 mode_t mode = 0; 1133 1134 switch(type) { 1135 case S_IRUSR: 1136 if((*mask) & GENERIC_ALL_ACCESS) 1137 mode = S_IRUSR|S_IWUSR|S_IXUSR; 1138 else { 1139 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0; 1140 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0; 1141 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0; 1142 } 1143 break; 1144 case S_IRGRP: 1145 if((*mask) & GENERIC_ALL_ACCESS) 1146 mode = S_IRGRP|S_IWGRP|S_IXGRP; 1147 else { 1148 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0; 1149 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0; 1150 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0; 1151 } 1152 break; 1153 case S_IROTH: 1154 if((*mask) & GENERIC_ALL_ACCESS) 1155 mode = S_IROTH|S_IWOTH|S_IXOTH; 1156 else { 1157 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0; 1158 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0; 1159 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0; 1160 } 1161 break; 1162 } 1163 1164 return mode; 1165} 1166 1167/**************************************************************************** 1168 Unpack a SEC_DESC into a UNIX owner and group. 1169****************************************************************************/ 1170 1171NTSTATUS unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, const SEC_DESC *psd) 1172{ 1173 DOM_SID owner_sid; 1174 DOM_SID grp_sid; 1175 1176 *puser = (uid_t)-1; 1177 *pgrp = (gid_t)-1; 1178 1179 if(security_info_sent == 0) { 1180 DEBUG(0,("unpack_nt_owners: no security info sent !\n")); 1181 return NT_STATUS_OK; 1182 } 1183 1184 /* 1185 * Validate the owner and group SID's. 1186 */ 1187 1188 memset(&owner_sid, '\0', sizeof(owner_sid)); 1189 memset(&grp_sid, '\0', sizeof(grp_sid)); 1190 1191 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n")); 1192 1193 /* 1194 * Don't immediately fail if the owner sid cannot be validated. 1195 * This may be a group chown only set. 1196 */ 1197 1198 if (security_info_sent & OWNER_SECURITY_INFORMATION) { 1199 sid_copy(&owner_sid, psd->owner_sid); 1200 if (!sid_to_uid(&owner_sid, puser)) { 1201 if (lp_force_unknown_acl_user(snum)) { 1202 /* this allows take ownership to work 1203 * reasonably */ 1204 *puser = current_user.ut.uid; 1205 } else { 1206 DEBUG(3,("unpack_nt_owners: unable to validate" 1207 " owner sid for %s\n", 1208 sid_string_dbg(&owner_sid))); 1209 return NT_STATUS_INVALID_OWNER; 1210 } 1211 } 1212 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n", 1213 (unsigned int)*puser )); 1214 } 1215 1216 /* 1217 * Don't immediately fail if the group sid cannot be validated. 1218 * This may be an owner chown only set. 1219 */ 1220 1221 if (security_info_sent & GROUP_SECURITY_INFORMATION) { 1222 sid_copy(&grp_sid, psd->group_sid); 1223 if (!sid_to_gid( &grp_sid, pgrp)) { 1224 if (lp_force_unknown_acl_user(snum)) { 1225 /* this allows take group ownership to work 1226 * reasonably */ 1227 *pgrp = current_user.ut.gid; 1228 } else { 1229 DEBUG(3,("unpack_nt_owners: unable to validate" 1230 " group sid.\n")); 1231 return NT_STATUS_INVALID_OWNER; 1232 } 1233 } 1234 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n", 1235 (unsigned int)*pgrp)); 1236 } 1237 1238 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n")); 1239 1240 return NT_STATUS_OK; 1241} 1242 1243/**************************************************************************** 1244 Ensure the enforced permissions for this share apply. 1245****************************************************************************/ 1246 1247static void apply_default_perms(const struct share_params *params, 1248 const bool is_directory, canon_ace *pace, 1249 mode_t type) 1250{ 1251 mode_t and_bits = (mode_t)0; 1252 mode_t or_bits = (mode_t)0; 1253 1254 /* Get the initial bits to apply. */ 1255 1256 if (is_directory) { 1257 and_bits = lp_dir_security_mask(params->service); 1258 or_bits = lp_force_dir_security_mode(params->service); 1259 } else { 1260 and_bits = lp_security_mask(params->service); 1261 or_bits = lp_force_security_mode(params->service); 1262 } 1263 1264 /* Now bounce them into the S_USR space. */ 1265 switch(type) { 1266 case S_IRUSR: 1267 /* Ensure owner has read access. */ 1268 pace->perms |= S_IRUSR; 1269 if (is_directory) 1270 pace->perms |= (S_IWUSR|S_IXUSR); 1271 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR); 1272 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR); 1273 break; 1274 case S_IRGRP: 1275 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP); 1276 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP); 1277 break; 1278 case S_IROTH: 1279 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH); 1280 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH); 1281 break; 1282 } 1283 1284 pace->perms = ((pace->perms & and_bits)|or_bits); 1285} 1286 1287/**************************************************************************** 1288 Check if a given uid/SID is in a group gid/SID. This is probably very 1289 expensive and will need optimisation. A *lot* of optimisation :-). JRA. 1290****************************************************************************/ 1291 1292static bool uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace ) 1293{ 1294 const char *u_name = NULL; 1295 1296 /* "Everyone" always matches every uid. */ 1297 1298 if (sid_equal(&group_ace->trustee, &global_sid_World)) 1299 return True; 1300 1301 /* 1302 * if it's the current user, we already have the unix token 1303 * and don't need to do the complex user_in_group_sid() call 1304 */ 1305 if (uid_ace->unix_ug.uid == current_user.ut.uid) { 1306 size_t i; 1307 1308 if (group_ace->unix_ug.gid == current_user.ut.gid) { 1309 return True; 1310 } 1311 1312 for (i=0; i < current_user.ut.ngroups; i++) { 1313 if (group_ace->unix_ug.gid == current_user.ut.groups[i]) { 1314 return True; 1315 } 1316 } 1317 } 1318 1319 /* u_name talloc'ed off tos. */ 1320 u_name = uidtoname(uid_ace->unix_ug.uid); 1321 if (!u_name) { 1322 return False; 1323 } 1324 1325 /* 1326 * user_in_group_sid() uses create_token_from_username() 1327 * which creates an artificial NT token given just a username, 1328 * so this is not reliable for users from foreign domains 1329 * exported by winbindd! 1330 */ 1331 return user_in_group_sid(u_name, &group_ace->trustee); 1332} 1333 1334/**************************************************************************** 1335 A well formed POSIX file or default ACL has at least 3 entries, a 1336 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ. 1337 In addition, the owner must always have at least read access. 1338 When using this call on get_acl, the pst struct is valid and contains 1339 the mode of the file. When using this call on set_acl, the pst struct has 1340 been modified to have a mode containing the default for this file or directory 1341 type. 1342****************************************************************************/ 1343 1344static bool ensure_canon_entry_valid(canon_ace **pp_ace, 1345 const struct share_params *params, 1346 const bool is_directory, 1347 const DOM_SID *pfile_owner_sid, 1348 const DOM_SID *pfile_grp_sid, 1349 const SMB_STRUCT_STAT *pst, 1350 bool setting_acl) 1351{ 1352 canon_ace *pace; 1353 bool got_user = False; 1354 bool got_grp = False; 1355 bool got_other = False; 1356 canon_ace *pace_other = NULL; 1357 1358 for (pace = *pp_ace; pace; pace = pace->next) { 1359 if (pace->type == SMB_ACL_USER_OBJ) { 1360 1361 if (setting_acl) 1362 apply_default_perms(params, is_directory, pace, S_IRUSR); 1363 got_user = True; 1364 1365 } else if (pace->type == SMB_ACL_GROUP_OBJ) { 1366 1367 /* 1368 * Ensure create mask/force create mode is respected on set. 1369 */ 1370 1371 if (setting_acl) 1372 apply_default_perms(params, is_directory, pace, S_IRGRP); 1373 got_grp = True; 1374 1375 } else if (pace->type == SMB_ACL_OTHER) { 1376 1377 /* 1378 * Ensure create mask/force create mode is respected on set. 1379 */ 1380 1381 if (setting_acl) 1382 apply_default_perms(params, is_directory, pace, S_IROTH); 1383 got_other = True; 1384 pace_other = pace; 1385 } 1386 } 1387 1388 if (!got_user) { 1389 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) { 1390 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n")); 1391 return False; 1392 } 1393 1394 ZERO_STRUCTP(pace); 1395 pace->type = SMB_ACL_USER_OBJ; 1396 pace->owner_type = UID_ACE; 1397 pace->unix_ug.uid = pst->st_ex_uid; 1398 pace->trustee = *pfile_owner_sid; 1399 pace->attr = ALLOW_ACE; 1400 1401 if (setting_acl) { 1402 /* See if the owning user is in any of the other groups in 1403 the ACE. If so, OR in the permissions from that group. */ 1404 1405 bool group_matched = False; 1406 canon_ace *pace_iter; 1407 1408 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) { 1409 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) { 1410 if (uid_entry_in_group(pace, pace_iter)) { 1411 pace->perms |= pace_iter->perms; 1412 group_matched = True; 1413 } 1414 } 1415 } 1416 1417 /* If we only got an "everyone" perm, just use that. */ 1418 if (!group_matched) { 1419 if (got_other) 1420 pace->perms = pace_other->perms; 1421 else 1422 pace->perms = 0; 1423 } 1424 1425 apply_default_perms(params, is_directory, pace, S_IRUSR); 1426 } else { 1427 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR); 1428 } 1429 1430 DLIST_ADD(*pp_ace, pace); 1431 } 1432 1433 if (!got_grp) { 1434 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) { 1435 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n")); 1436 return False; 1437 } 1438 1439 ZERO_STRUCTP(pace); 1440 pace->type = SMB_ACL_GROUP_OBJ; 1441 pace->owner_type = GID_ACE; 1442 pace->unix_ug.uid = pst->st_ex_gid; 1443 pace->trustee = *pfile_grp_sid; 1444 pace->attr = ALLOW_ACE; 1445 if (setting_acl) { 1446 /* If we only got an "everyone" perm, just use that. */ 1447 if (got_other) 1448 pace->perms = pace_other->perms; 1449 else 1450 pace->perms = 0; 1451 apply_default_perms(params, is_directory, pace, S_IRGRP); 1452 } else { 1453 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP); 1454 } 1455 1456 DLIST_ADD(*pp_ace, pace); 1457 } 1458 1459 if (!got_other) { 1460 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) { 1461 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n")); 1462 return False; 1463 } 1464 1465 ZERO_STRUCTP(pace); 1466 pace->type = SMB_ACL_OTHER; 1467 pace->owner_type = WORLD_ACE; 1468 pace->unix_ug.world = -1; 1469 pace->trustee = global_sid_World; 1470 pace->attr = ALLOW_ACE; 1471 if (setting_acl) { 1472 pace->perms = 0; 1473 apply_default_perms(params, is_directory, pace, S_IROTH); 1474 } else 1475 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH); 1476 1477 DLIST_ADD(*pp_ace, pace); 1478 } 1479 1480 return True; 1481} 1482 1483/**************************************************************************** 1484 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries. 1485 If it does not have them, check if there are any entries where the trustee is the 1486 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ. 1487****************************************************************************/ 1488 1489static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid) 1490{ 1491 bool got_user_obj, got_group_obj; 1492 canon_ace *current_ace; 1493 int i, entries; 1494 1495 entries = count_canon_ace_list(ace); 1496 got_user_obj = False; 1497 got_group_obj = False; 1498 1499 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) { 1500 if (current_ace->type == SMB_ACL_USER_OBJ) 1501 got_user_obj = True; 1502 else if (current_ace->type == SMB_ACL_GROUP_OBJ) 1503 got_group_obj = True; 1504 } 1505 if (got_user_obj && got_group_obj) { 1506 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n")); 1507 return; 1508 } 1509 1510 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) { 1511 if (!got_user_obj && current_ace->owner_type == UID_ACE && 1512 sid_equal(¤t_ace->trustee, pfile_owner_sid)) { 1513 current_ace->type = SMB_ACL_USER_OBJ; 1514 got_user_obj = True; 1515 } 1516 if (!got_group_obj && current_ace->owner_type == GID_ACE && 1517 sid_equal(¤t_ace->trustee, pfile_grp_sid)) { 1518 current_ace->type = SMB_ACL_GROUP_OBJ; 1519 got_group_obj = True; 1520 } 1521 } 1522 if (!got_user_obj) 1523 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n")); 1524 if (!got_group_obj) 1525 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n")); 1526} 1527 1528/**************************************************************************** 1529 If an ACE entry is SMB_ACL_USER_OBJ and not CREATOR_OWNER, map to SMB_ACL_USER. 1530 If an ACE entry is SMB_ACL_GROUP_OBJ and not CREATOR_GROUP, map to SMB_ACL_GROUP 1531****************************************************************************/ 1532 1533static bool dup_owning_ace(canon_ace *dir_ace, canon_ace *ace) 1534{ 1535 /* dir ace must be followings. 1536 SMB_ACL_USER_OBJ : trustee(CREATOR_OWNER) -> Posix ACL d:u::perm 1537 SMB_ACL_USER : not trustee -> Posix ACL u:user:perm 1538 SMB_ACL_USER_OBJ : trustee -> convert to SMB_ACL_USER : trustee 1539 Posix ACL u:trustee:perm 1540 1541 SMB_ACL_GROUP_OBJ: trustee(CREATOR_GROUP) -> Posix ACL d:g::perm 1542 SMB_ACL_GROUP : not trustee -> Posix ACL g:group:perm 1543 SMB_ACL_GROUP_OBJ: trustee -> convert to SMB_ACL_GROUP : trustee 1544 Posix ACL g:trustee:perm 1545 */ 1546 1547 if (ace->type == SMB_ACL_USER_OBJ && 1548 !(sid_equal(&ace->trustee, &global_sid_Creator_Owner))) { 1549 canon_ace *dup_ace = dup_canon_ace(ace); 1550 1551 if (dup_ace == NULL) { 1552 return false; 1553 } 1554 dup_ace->type = SMB_ACL_USER; 1555 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *); 1556 } 1557 1558 if (ace->type == SMB_ACL_GROUP_OBJ && 1559 !(sid_equal(&ace->trustee, &global_sid_Creator_Group))) { 1560 canon_ace *dup_ace = dup_canon_ace(ace); 1561 1562 if (dup_ace == NULL) { 1563 return false; 1564 } 1565 dup_ace->type = SMB_ACL_GROUP; 1566 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *); 1567 } 1568 1569 return true; 1570} 1571 1572/**************************************************************************** 1573 Unpack a SEC_DESC into two canonical ace lists. 1574****************************************************************************/ 1575 1576static bool create_canon_ace_lists(files_struct *fsp, 1577 const SMB_STRUCT_STAT *pst, 1578 DOM_SID *pfile_owner_sid, 1579 DOM_SID *pfile_grp_sid, 1580 canon_ace **ppfile_ace, 1581 canon_ace **ppdir_ace, 1582 const SEC_ACL *dacl) 1583{ 1584 bool all_aces_are_inherit_only = (fsp->is_directory ? True : False); 1585 canon_ace *file_ace = NULL; 1586 canon_ace *dir_ace = NULL; 1587 canon_ace *current_ace = NULL; 1588 bool got_dir_allow = False; 1589 bool got_file_allow = False; 1590 int i, j; 1591 1592 *ppfile_ace = NULL; 1593 *ppdir_ace = NULL; 1594 1595 /* 1596 * Convert the incoming ACL into a more regular form. 1597 */ 1598 1599 for(i = 0; i < dacl->num_aces; i++) { 1600 SEC_ACE *psa = &dacl->aces[i]; 1601 1602 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) { 1603 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n")); 1604 return False; 1605 } 1606 1607 if (nt4_compatible_acls()) { 1608 /* 1609 * The security mask may be UNIX_ACCESS_NONE which should map into 1610 * no permissions (we overload the WRITE_OWNER bit for this) or it 1611 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this 1612 * to be so. Any other bits override the UNIX_ACCESS_NONE bit. 1613 */ 1614 1615 /* 1616 * Convert GENERIC bits to specific bits. 1617 */ 1618 1619 se_map_generic(&psa->access_mask, &file_generic_mapping); 1620 1621 psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS); 1622 1623 if(psa->access_mask != UNIX_ACCESS_NONE) 1624 psa->access_mask &= ~UNIX_ACCESS_NONE; 1625 } 1626 } 1627 1628 /* 1629 * Deal with the fact that NT 4.x re-writes the canonical format 1630 * that we return for default ACLs. If a directory ACE is identical 1631 * to a inherited directory ACE then NT changes the bits so that the 1632 * first ACE is set to OI|IO and the second ACE for this SID is set 1633 * to CI. We need to repair this. JRA. 1634 */ 1635 1636 for(i = 0; i < dacl->num_aces; i++) { 1637 SEC_ACE *psa1 = &dacl->aces[i]; 1638 1639 for (j = i + 1; j < dacl->num_aces; j++) { 1640 SEC_ACE *psa2 = &dacl->aces[j]; 1641 1642 if (psa1->access_mask != psa2->access_mask) 1643 continue; 1644 1645 if (!sid_equal(&psa1->trustee, &psa2->trustee)) 1646 continue; 1647 1648 /* 1649 * Ok - permission bits and SIDs are equal. 1650 * Check if flags were re-written. 1651 */ 1652 1653 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) { 1654 1655 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT)); 1656 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT); 1657 1658 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) { 1659 1660 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT)); 1661 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT); 1662 1663 } 1664 } 1665 } 1666 1667 for(i = 0; i < dacl->num_aces; i++) { 1668 SEC_ACE *psa = &dacl->aces[i]; 1669 1670 /* 1671 * Create a cannon_ace entry representing this NT DACL ACE. 1672 */ 1673 1674 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) { 1675 free_canon_ace_list(file_ace); 1676 free_canon_ace_list(dir_ace); 1677 DEBUG(0,("create_canon_ace_lists: malloc fail.\n")); 1678 return False; 1679 } 1680 1681 ZERO_STRUCTP(current_ace); 1682 1683 sid_copy(¤t_ace->trustee, &psa->trustee); 1684 1685 /* 1686 * Try and work out if the SID is a user or group 1687 * as we need to flag these differently for POSIX. 1688 * Note what kind of a POSIX ACL this should map to. 1689 */ 1690 1691 if( sid_equal(¤t_ace->trustee, &global_sid_World)) { 1692 current_ace->owner_type = WORLD_ACE; 1693 current_ace->unix_ug.world = -1; 1694 current_ace->type = SMB_ACL_OTHER; 1695 } else if (sid_equal(¤t_ace->trustee, &global_sid_Creator_Owner)) { 1696 current_ace->owner_type = UID_ACE; 1697 current_ace->unix_ug.uid = pst->st_ex_uid; 1698 current_ace->type = SMB_ACL_USER_OBJ; 1699 1700 /* 1701 * The Creator Owner entry only specifies inheritable permissions, 1702 * never access permissions. WinNT doesn't always set the ACE to 1703 * INHERIT_ONLY, though. 1704 */ 1705 1706 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY; 1707 1708 } else if (sid_equal(¤t_ace->trustee, &global_sid_Creator_Group)) { 1709 current_ace->owner_type = GID_ACE; 1710 current_ace->unix_ug.gid = pst->st_ex_gid; 1711 current_ace->type = SMB_ACL_GROUP_OBJ; 1712 1713 /* 1714 * The Creator Group entry only specifies inheritable permissions, 1715 * never access permissions. WinNT doesn't always set the ACE to 1716 * INHERIT_ONLY, though. 1717 */ 1718 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY; 1719 1720 } else if (sid_to_uid( ¤t_ace->trustee, ¤t_ace->unix_ug.uid)) { 1721 current_ace->owner_type = UID_ACE; 1722 /* If it's the owning user, this is a user_obj, not 1723 * a user. */ 1724 if (current_ace->unix_ug.uid == pst->st_ex_uid) { 1725 current_ace->type = SMB_ACL_USER_OBJ; 1726 } else { 1727 current_ace->type = SMB_ACL_USER; 1728 } 1729 } else if (sid_to_gid( ¤t_ace->trustee, ¤t_ace->unix_ug.gid)) { 1730 current_ace->owner_type = GID_ACE; 1731 /* If it's the primary group, this is a group_obj, not 1732 * a group. */ 1733 if (current_ace->unix_ug.gid == pst->st_ex_gid) { 1734 current_ace->type = SMB_ACL_GROUP_OBJ; 1735 } else { 1736 current_ace->type = SMB_ACL_GROUP; 1737 } 1738 } else { 1739 /* 1740 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc). 1741 */ 1742 1743 if (non_mappable_sid(&psa->trustee)) { 1744 DEBUG(10, ("create_canon_ace_lists: ignoring " 1745 "non-mappable SID %s\n", 1746 sid_string_dbg(&psa->trustee))); 1747 SAFE_FREE(current_ace); 1748 continue; 1749 } 1750 1751 if (lp_force_unknown_acl_user(SNUM(fsp->conn))) { 1752 DEBUG(10, ("create_canon_ace_lists: ignoring " 1753 "unknown or foreign SID %s\n", 1754 sid_string_dbg(&psa->trustee))); 1755 SAFE_FREE(current_ace); 1756 continue; 1757 } 1758 1759 free_canon_ace_list(file_ace); 1760 free_canon_ace_list(dir_ace); 1761 DEBUG(0, ("create_canon_ace_lists: unable to map SID " 1762 "%s to uid or gid.\n", 1763 sid_string_dbg(¤t_ace->trustee))); 1764 SAFE_FREE(current_ace); 1765 return False; 1766 } 1767 1768 /* 1769 * Map the given NT permissions into a UNIX mode_t containing only 1770 * S_I(R|W|X)USR bits. 1771 */ 1772 1773 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR); 1774 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE; 1775 1776 /* Store the ace_flag. */ 1777 current_ace->ace_flags = psa->flags; 1778 1779 /* 1780 * Now add the created ace to either the file list, the directory 1781 * list, or both. We *MUST* preserve the order here (hence we use 1782 * DLIST_ADD_END) as NT ACLs are order dependent. 1783 */ 1784 1785 if (fsp->is_directory) { 1786 1787 /* 1788 * We can only add to the default POSIX ACE list if the ACE is 1789 * designed to be inherited by both files and directories. 1790 */ 1791 1792 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) == 1793 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) { 1794 1795 DLIST_ADD_END(dir_ace, current_ace, canon_ace *); 1796 1797 /* 1798 * Note if this was an allow ace. We can't process 1799 * any further deny ace's after this. 1800 */ 1801 1802 if (current_ace->attr == ALLOW_ACE) 1803 got_dir_allow = True; 1804 1805 if ((current_ace->attr == DENY_ACE) && got_dir_allow) { 1806 DEBUG(0,("create_canon_ace_lists: " 1807 "malformed ACL in " 1808 "inheritable ACL! Deny entry " 1809 "after Allow entry. Failing " 1810 "to set on file %s.\n", 1811 fsp_str_dbg(fsp))); 1812 free_canon_ace_list(file_ace); 1813 free_canon_ace_list(dir_ace); 1814 return False; 1815 } 1816 1817 if( DEBUGLVL( 10 )) { 1818 dbgtext("create_canon_ace_lists: adding dir ACL:\n"); 1819 print_canon_ace( current_ace, 0); 1820 } 1821 1822 /* 1823 * We have a lossy mapping: directory ACE entries 1824 * CREATOR_OWNER ------\ 1825 * (map to) +---> SMB_ACL_USER_OBJ 1826 * owning sid ------/ 1827 * 1828 * CREATOR_GROUP ------\ 1829 * (map to) +---> SMB_ACL_GROUP_OBJ 1830 * primary group sid --/ 1831 * 1832 * on set. And on read of a directory ACL 1833 * 1834 * SMB_ACL_USER_OBJ ----> CREATOR_OWNER 1835 * SMB_ACL_GROUP_OBJ ---> CREATOR_GROUP. 1836 * 1837 * Deal with this on set by duplicating 1838 * owning sid and primary group sid ACE 1839 * entries into the directory ACL. 1840 * Fix from Tsukasa Hamano <hamano@osstech.co.jp>. 1841 */ 1842 1843 if (!dup_owning_ace(dir_ace, current_ace)) { 1844 DEBUG(0,("create_canon_ace_lists: malloc fail !\n")); 1845 free_canon_ace_list(file_ace); 1846 free_canon_ace_list(dir_ace); 1847 return false; 1848 } 1849 1850 /* 1851 * If this is not an inherit only ACE we need to add a duplicate 1852 * to the file acl. 1853 */ 1854 1855 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) { 1856 canon_ace *dup_ace = dup_canon_ace(current_ace); 1857 1858 if (!dup_ace) { 1859 DEBUG(0,("create_canon_ace_lists: malloc fail !\n")); 1860 free_canon_ace_list(file_ace); 1861 free_canon_ace_list(dir_ace); 1862 return False; 1863 } 1864 1865 /* 1866 * We must not free current_ace here as its 1867 * pointer is now owned by the dir_ace list. 1868 */ 1869 current_ace = dup_ace; 1870 /* We've essentially split this ace into two, 1871 * and added the ace with inheritance request 1872 * bits to the directory ACL. Drop those bits for 1873 * the ACE we're adding to the file list. */ 1874 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT| 1875 SEC_ACE_FLAG_CONTAINER_INHERIT| 1876 SEC_ACE_FLAG_INHERIT_ONLY); 1877 } else { 1878 /* 1879 * We must not free current_ace here as its 1880 * pointer is now owned by the dir_ace list. 1881 */ 1882 current_ace = NULL; 1883 } 1884 } 1885 } 1886 1887 /* 1888 * Only add to the file ACL if not inherit only. 1889 */ 1890 1891 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) { 1892 DLIST_ADD_END(file_ace, current_ace, canon_ace *); 1893 1894 /* 1895 * Note if this was an allow ace. We can't process 1896 * any further deny ace's after this. 1897 */ 1898 1899 if (current_ace->attr == ALLOW_ACE) 1900 got_file_allow = True; 1901 1902 if ((current_ace->attr == DENY_ACE) && got_file_allow) { 1903 DEBUG(0,("create_canon_ace_lists: malformed " 1904 "ACL in file ACL ! Deny entry after " 1905 "Allow entry. Failing to set on file " 1906 "%s.\n", fsp_str_dbg(fsp))); 1907 free_canon_ace_list(file_ace); 1908 free_canon_ace_list(dir_ace); 1909 return False; 1910 } 1911 1912 if( DEBUGLVL( 10 )) { 1913 dbgtext("create_canon_ace_lists: adding file ACL:\n"); 1914 print_canon_ace( current_ace, 0); 1915 } 1916 all_aces_are_inherit_only = False; 1917 /* 1918 * We must not free current_ace here as its 1919 * pointer is now owned by the file_ace list. 1920 */ 1921 current_ace = NULL; 1922 } 1923 1924 /* 1925 * Free if ACE was not added. 1926 */ 1927 1928 SAFE_FREE(current_ace); 1929 } 1930 1931 if (fsp->is_directory && all_aces_are_inherit_only) { 1932 /* 1933 * Windows 2000 is doing one of these weird 'inherit acl' 1934 * traverses to conserve NTFS ACL resources. Just pretend 1935 * there was no DACL sent. JRA. 1936 */ 1937 1938 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n")); 1939 free_canon_ace_list(file_ace); 1940 free_canon_ace_list(dir_ace); 1941 file_ace = NULL; 1942 dir_ace = NULL; 1943 } else { 1944 /* 1945 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each 1946 * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP 1947 * entries can be converted to *_OBJ. Usually we will already have these 1948 * entries in the Default ACL, and the Access ACL will not have them. 1949 */ 1950 if (file_ace) { 1951 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid); 1952 } 1953 if (dir_ace) { 1954 check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid); 1955 } 1956 } 1957 1958 *ppfile_ace = file_ace; 1959 *ppdir_ace = dir_ace; 1960 1961 return True; 1962} 1963 1964/**************************************************************************** 1965 ASCII art time again... JRA :-). 1966 1967 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly, 1968 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW 1969 entries). Secondly, the merge code has ensured that all duplicate SID entries for 1970 allow or deny have been merged, so the same SID can only appear once in the deny 1971 list or once in the allow list. 1972 1973 We then process as follows : 1974 1975 --------------------------------------------------------------------------- 1976 First pass - look for a Everyone DENY entry. 1977 1978 If it is deny all (rwx) trunate the list at this point. 1979 Else, walk the list from this point and use the deny permissions of this 1980 entry as a mask on all following allow entries. Finally, delete 1981 the Everyone DENY entry (we have applied it to everything possible). 1982 1983 In addition, in this pass we remove any DENY entries that have 1984 no permissions (ie. they are a DENY nothing). 1985 --------------------------------------------------------------------------- 1986 Second pass - only deal with deny user entries. 1987 1988 DENY user1 (perms XXX) 1989 1990 new_perms = 0 1991 for all following allow group entries where user1 is in group 1992 new_perms |= group_perms; 1993 1994 user1 entry perms = new_perms & ~ XXX; 1995 1996 Convert the deny entry to an allow entry with the new perms and 1997 push to the end of the list. Note if the user was in no groups 1998 this maps to a specific allow nothing entry for this user. 1999 2000 The common case from the NT ACL choser (userX deny all) is 2001 optimised so we don't do the group lookup - we just map to 2002 an allow nothing entry. 2003 2004 What we're doing here is inferring the allow permissions the 2005 person setting the ACE on user1 wanted by looking at the allow 2006 permissions on the groups the user is currently in. This will 2007 be a snapshot, depending on group membership but is the best 2008 we can do and has the advantage of failing closed rather than 2009 open. 2010 --------------------------------------------------------------------------- 2011 Third pass - only deal with deny group entries. 2012 2013 DENY group1 (perms XXX) 2014 2015 for all following allow user entries where user is in group1 2016 user entry perms = user entry perms & ~ XXX; 2017 2018 If there is a group Everyone allow entry with permissions YYY, 2019 convert the group1 entry to an allow entry and modify its 2020 permissions to be : 2021 2022 new_perms = YYY & ~ XXX 2023 2024 and push to the end of the list. 2025 2026 If there is no group Everyone allow entry then convert the 2027 group1 entry to a allow nothing entry and push to the end of the list. 2028 2029 Note that the common case from the NT ACL choser (groupX deny all) 2030 cannot be optimised here as we need to modify user entries who are 2031 in the group to change them to a deny all also. 2032 2033 What we're doing here is modifying the allow permissions of 2034 user entries (which are more specific in POSIX ACLs) to mask 2035 out the explicit deny set on the group they are in. This will 2036 be a snapshot depending on current group membership but is the 2037 best we can do and has the advantage of failing closed rather 2038 than open. 2039 --------------------------------------------------------------------------- 2040 Fourth pass - cope with cumulative permissions. 2041 2042 for all allow user entries, if there exists an allow group entry with 2043 more permissive permissions, and the user is in that group, rewrite the 2044 allow user permissions to contain both sets of permissions. 2045 2046 Currently the code for this is #ifdef'ed out as these semantics make 2047 no sense to me. JRA. 2048 --------------------------------------------------------------------------- 2049 2050 Note we *MUST* do the deny user pass first as this will convert deny user 2051 entries into allow user entries which can then be processed by the deny 2052 group pass. 2053 2054 The above algorithm took a *lot* of thinking about - hence this 2055 explaination :-). JRA. 2056****************************************************************************/ 2057 2058/**************************************************************************** 2059 Process a canon_ace list entries. This is very complex code. We need 2060 to go through and remove the "deny" permissions from any allow entry that matches 2061 the id of this entry. We have already refused any NT ACL that wasn't in correct 2062 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions, 2063 we just remove it (to fail safe). We have already removed any duplicate ace 2064 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all 2065 allow entries. 2066****************************************************************************/ 2067 2068static void process_deny_list( canon_ace **pp_ace_list ) 2069{ 2070 canon_ace *ace_list = *pp_ace_list; 2071 canon_ace *curr_ace = NULL; 2072 canon_ace *curr_ace_next = NULL; 2073 2074 /* Pass 1 above - look for an Everyone, deny entry. */ 2075 2076 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) { 2077 canon_ace *allow_ace_p; 2078 2079 curr_ace_next = curr_ace->next; /* So we can't lose the link. */ 2080 2081 if (curr_ace->attr != DENY_ACE) 2082 continue; 2083 2084 if (curr_ace->perms == (mode_t)0) { 2085 2086 /* Deny nothing entry - delete. */ 2087 2088 DLIST_REMOVE(ace_list, curr_ace); 2089 continue; 2090 } 2091 2092 if (!sid_equal(&curr_ace->trustee, &global_sid_World)) 2093 continue; 2094 2095 /* JRATEST - assert. */ 2096 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE); 2097 2098 if (curr_ace->perms == ALL_ACE_PERMS) { 2099 2100 /* 2101 * Optimisation. This is a DENY_ALL to Everyone. Truncate the 2102 * list at this point including this entry. 2103 */ 2104 2105 canon_ace *prev_entry = curr_ace->prev; 2106 2107 free_canon_ace_list( curr_ace ); 2108 if (prev_entry) 2109 prev_entry->next = NULL; 2110 else { 2111 /* We deleted the entire list. */ 2112 ace_list = NULL; 2113 } 2114 break; 2115 } 2116 2117 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) { 2118 2119 /* 2120 * Only mask off allow entries. 2121 */ 2122 2123 if (allow_ace_p->attr != ALLOW_ACE) 2124 continue; 2125 2126 allow_ace_p->perms &= ~curr_ace->perms; 2127 } 2128 2129 /* 2130 * Now it's been applied, remove it. 2131 */ 2132 2133 DLIST_REMOVE(ace_list, curr_ace); 2134 } 2135 2136 /* Pass 2 above - deal with deny user entries. */ 2137 2138 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) { 2139 mode_t new_perms = (mode_t)0; 2140 canon_ace *allow_ace_p; 2141 2142 curr_ace_next = curr_ace->next; /* So we can't lose the link. */ 2143 2144 if (curr_ace->attr != DENY_ACE) 2145 continue; 2146 2147 if (curr_ace->owner_type != UID_ACE) 2148 continue; 2149 2150 if (curr_ace->perms == ALL_ACE_PERMS) { 2151 2152 /* 2153 * Optimisation - this is a deny everything to this user. 2154 * Convert to an allow nothing and push to the end of the list. 2155 */ 2156 2157 curr_ace->attr = ALLOW_ACE; 2158 curr_ace->perms = (mode_t)0; 2159 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *); 2160 continue; 2161 } 2162 2163 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) { 2164 2165 if (allow_ace_p->attr != ALLOW_ACE) 2166 continue; 2167 2168 /* We process GID_ACE and WORLD_ACE entries only. */ 2169 2170 if (allow_ace_p->owner_type == UID_ACE) 2171 continue; 2172 2173 if (uid_entry_in_group( curr_ace, allow_ace_p)) 2174 new_perms |= allow_ace_p->perms; 2175 } 2176 2177 /* 2178 * Convert to a allow entry, modify the perms and push to the end 2179 * of the list. 2180 */ 2181 2182 curr_ace->attr = ALLOW_ACE; 2183 curr_ace->perms = (new_perms & ~curr_ace->perms); 2184 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *); 2185 } 2186 2187 /* Pass 3 above - deal with deny group entries. */ 2188 2189 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) { 2190 canon_ace *allow_ace_p; 2191 canon_ace *allow_everyone_p = NULL; 2192 2193 curr_ace_next = curr_ace->next; /* So we can't lose the link. */ 2194 2195 if (curr_ace->attr != DENY_ACE) 2196 continue; 2197 2198 if (curr_ace->owner_type != GID_ACE) 2199 continue; 2200 2201 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) { 2202 2203 if (allow_ace_p->attr != ALLOW_ACE) 2204 continue; 2205 2206 /* Store a pointer to the Everyone allow, if it exists. */ 2207 if (allow_ace_p->owner_type == WORLD_ACE) 2208 allow_everyone_p = allow_ace_p; 2209 2210 /* We process UID_ACE entries only. */ 2211 2212 if (allow_ace_p->owner_type != UID_ACE) 2213 continue; 2214 2215 /* Mask off the deny group perms. */ 2216 2217 if (uid_entry_in_group( allow_ace_p, curr_ace)) 2218 allow_ace_p->perms &= ~curr_ace->perms; 2219 } 2220 2221 /* 2222 * Convert the deny to an allow with the correct perms and 2223 * push to the end of the list. 2224 */ 2225 2226 curr_ace->attr = ALLOW_ACE; 2227 if (allow_everyone_p) 2228 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms; 2229 else 2230 curr_ace->perms = (mode_t)0; 2231 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *); 2232 } 2233 2234 /* Doing this fourth pass allows Windows semantics to be layered 2235 * on top of POSIX semantics. I'm not sure if this is desirable. 2236 * For example, in W2K ACLs there is no way to say, "Group X no 2237 * access, user Y full access" if user Y is a member of group X. 2238 * This seems completely broken semantics to me.... JRA. 2239 */ 2240 2241#if 0 2242 /* Pass 4 above - deal with allow entries. */ 2243 2244 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) { 2245 canon_ace *allow_ace_p; 2246 2247 curr_ace_next = curr_ace->next; /* So we can't lose the link. */ 2248 2249 if (curr_ace->attr != ALLOW_ACE) 2250 continue; 2251 2252 if (curr_ace->owner_type != UID_ACE) 2253 continue; 2254 2255 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) { 2256 2257 if (allow_ace_p->attr != ALLOW_ACE) 2258 continue; 2259 2260 /* We process GID_ACE entries only. */ 2261 2262 if (allow_ace_p->owner_type != GID_ACE) 2263 continue; 2264 2265 /* OR in the group perms. */ 2266 2267 if (uid_entry_in_group( curr_ace, allow_ace_p)) 2268 curr_ace->perms |= allow_ace_p->perms; 2269 } 2270 } 2271#endif 2272 2273 *pp_ace_list = ace_list; 2274} 2275 2276/**************************************************************************** 2277 Create a default mode that will be used if a security descriptor entry has 2278 no user/group/world entries. 2279****************************************************************************/ 2280 2281static mode_t create_default_mode(files_struct *fsp, bool interitable_mode) 2282{ 2283 int snum = SNUM(fsp->conn); 2284 mode_t and_bits = (mode_t)0; 2285 mode_t or_bits = (mode_t)0; 2286 mode_t mode; 2287 2288 if (interitable_mode) { 2289 mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE, 2290 fsp->fsp_name, NULL); 2291 } else { 2292 mode = S_IRUSR; 2293 } 2294 2295 if (fsp->is_directory) 2296 mode |= (S_IWUSR|S_IXUSR); 2297 2298 /* 2299 * Now AND with the create mode/directory mode bits then OR with the 2300 * force create mode/force directory mode bits. 2301 */ 2302 2303 if (fsp->is_directory) { 2304 and_bits = lp_dir_security_mask(snum); 2305 or_bits = lp_force_dir_security_mode(snum); 2306 } else { 2307 and_bits = lp_security_mask(snum); 2308 or_bits = lp_force_security_mode(snum); 2309 } 2310 2311 return ((mode & and_bits)|or_bits); 2312} 2313 2314/**************************************************************************** 2315 Unpack a SEC_DESC into two canonical ace lists. We don't depend on this 2316 succeeding. 2317****************************************************************************/ 2318 2319static bool unpack_canon_ace(files_struct *fsp, 2320 const SMB_STRUCT_STAT *pst, 2321 DOM_SID *pfile_owner_sid, 2322 DOM_SID *pfile_grp_sid, 2323 canon_ace **ppfile_ace, 2324 canon_ace **ppdir_ace, 2325 uint32 security_info_sent, 2326 const SEC_DESC *psd) 2327{ 2328 SMB_STRUCT_STAT st; 2329 canon_ace *file_ace = NULL; 2330 canon_ace *dir_ace = NULL; 2331 2332 *ppfile_ace = NULL; 2333 *ppdir_ace = NULL; 2334 2335 if(security_info_sent == 0) { 2336 DEBUG(0,("unpack_canon_ace: no security info sent !\n")); 2337 return False; 2338 } 2339 2340 /* 2341 * If no DACL then this is a chown only security descriptor. 2342 */ 2343 2344 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl) 2345 return True; 2346 2347 /* 2348 * Now go through the DACL and create the canon_ace lists. 2349 */ 2350 2351 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid, 2352 &file_ace, &dir_ace, psd->dacl)) 2353 return False; 2354 2355 if ((file_ace == NULL) && (dir_ace == NULL)) { 2356 /* W2K traverse DACL set - ignore. */ 2357 return True; 2358 } 2359 2360 /* 2361 * Go through the canon_ace list and merge entries 2362 * belonging to identical users of identical allow or deny type. 2363 * We can do this as all deny entries come first, followed by 2364 * all allow entries (we have mandated this before accepting this acl). 2365 */ 2366 2367 print_canon_ace_list( "file ace - before merge", file_ace); 2368 merge_aces( &file_ace, false); 2369 2370 print_canon_ace_list( "dir ace - before merge", dir_ace); 2371 merge_aces( &dir_ace, true); 2372 2373 /* 2374 * NT ACLs are order dependent. Go through the acl lists and 2375 * process DENY entries by masking the allow entries. 2376 */ 2377 2378 print_canon_ace_list( "file ace - before deny", file_ace); 2379 process_deny_list( &file_ace); 2380 2381 print_canon_ace_list( "dir ace - before deny", dir_ace); 2382 process_deny_list( &dir_ace); 2383 2384 /* 2385 * A well formed POSIX file or default ACL has at least 3 entries, a 2386 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ 2387 * and optionally a mask entry. Ensure this is the case. 2388 */ 2389 2390 print_canon_ace_list( "file ace - before valid", file_ace); 2391 2392 st = *pst; 2393 2394 /* 2395 * A default 3 element mode entry for a file should be r-- --- ---. 2396 * A default 3 element mode entry for a directory should be rwx --- ---. 2397 */ 2398 2399 st.st_ex_mode = create_default_mode(fsp, False); 2400 2401 if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params, 2402 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) { 2403 free_canon_ace_list(file_ace); 2404 free_canon_ace_list(dir_ace); 2405 return False; 2406 } 2407 2408 print_canon_ace_list( "dir ace - before valid", dir_ace); 2409 2410 /* 2411 * A default inheritable 3 element mode entry for a directory should be the 2412 * mode Samba will use to create a file within. Ensure user rwx bits are set if 2413 * it's a directory. 2414 */ 2415 2416 st.st_ex_mode = create_default_mode(fsp, True); 2417 2418 if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params, 2419 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) { 2420 free_canon_ace_list(file_ace); 2421 free_canon_ace_list(dir_ace); 2422 return False; 2423 } 2424 2425 print_canon_ace_list( "file ace - return", file_ace); 2426 print_canon_ace_list( "dir ace - return", dir_ace); 2427 2428 *ppfile_ace = file_ace; 2429 *ppdir_ace = dir_ace; 2430 return True; 2431 2432} 2433 2434/****************************************************************************** 2435 When returning permissions, try and fit NT display 2436 semantics if possible. Note the the canon_entries here must have been malloced. 2437 The list format should be - first entry = owner, followed by group and other user 2438 entries, last entry = other. 2439 2440 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries 2441 are not ordered, and match on the most specific entry rather than walking a list, 2442 then a simple POSIX permission of rw-r--r-- should really map to 5 entries, 2443 2444 Entry 0: owner : deny all except read and write. 2445 Entry 1: owner : allow read and write. 2446 Entry 2: group : deny all except read. 2447 Entry 3: group : allow read. 2448 Entry 4: Everyone : allow read. 2449 2450 But NT cannot display this in their ACL editor ! 2451********************************************************************************/ 2452 2453static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head) 2454{ 2455 canon_ace *l_head = *pp_list_head; 2456 canon_ace *owner_ace = NULL; 2457 canon_ace *other_ace = NULL; 2458 canon_ace *ace = NULL; 2459 2460 for (ace = l_head; ace; ace = ace->next) { 2461 if (ace->type == SMB_ACL_USER_OBJ) 2462 owner_ace = ace; 2463 else if (ace->type == SMB_ACL_OTHER) { 2464 /* Last ace - this is "other" */ 2465 other_ace = ace; 2466 } 2467 } 2468 2469 if (!owner_ace || !other_ace) { 2470 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n", 2471 filename )); 2472 return; 2473 } 2474 2475 /* 2476 * The POSIX algorithm applies to owner first, and other last, 2477 * so ensure they are arranged in this order. 2478 */ 2479 2480 if (owner_ace) { 2481 DLIST_PROMOTE(l_head, owner_ace); 2482 } 2483 2484 if (other_ace) { 2485 DLIST_DEMOTE(l_head, other_ace, canon_ace *); 2486 } 2487 2488 /* We have probably changed the head of the list. */ 2489 2490 *pp_list_head = l_head; 2491} 2492 2493/**************************************************************************** 2494 Create a linked list of canonical ACE entries. 2495****************************************************************************/ 2496 2497static canon_ace *canonicalise_acl(struct connection_struct *conn, 2498 const char *fname, SMB_ACL_T posix_acl, 2499 const SMB_STRUCT_STAT *psbuf, 2500 const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type) 2501{ 2502 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR); 2503 canon_ace *l_head = NULL; 2504 canon_ace *ace = NULL; 2505 canon_ace *next_ace = NULL; 2506 int entry_id = SMB_ACL_FIRST_ENTRY; 2507 SMB_ACL_ENTRY_T entry; 2508 size_t ace_count; 2509 2510 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) { 2511 SMB_ACL_TAG_T tagtype; 2512 SMB_ACL_PERMSET_T permset; 2513 DOM_SID sid; 2514 posix_id unix_ug; 2515 enum ace_owner owner_type; 2516 2517 entry_id = SMB_ACL_NEXT_ENTRY; 2518 2519 /* Is this a MASK entry ? */ 2520 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) 2521 continue; 2522 2523 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) 2524 continue; 2525 2526 /* Decide which SID to use based on the ACL type. */ 2527 switch(tagtype) { 2528 case SMB_ACL_USER_OBJ: 2529 /* Get the SID from the owner. */ 2530 sid_copy(&sid, powner); 2531 unix_ug.uid = psbuf->st_ex_uid; 2532 owner_type = UID_ACE; 2533 break; 2534 case SMB_ACL_USER: 2535 { 2536 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry); 2537 if (puid == NULL) { 2538 DEBUG(0,("canonicalise_acl: Failed to get uid.\n")); 2539 continue; 2540 } 2541 uid_to_sid( &sid, *puid); 2542 unix_ug.uid = *puid; 2543 owner_type = UID_ACE; 2544 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype); 2545 break; 2546 } 2547 case SMB_ACL_GROUP_OBJ: 2548 /* Get the SID from the owning group. */ 2549 sid_copy(&sid, pgroup); 2550 unix_ug.gid = psbuf->st_ex_gid; 2551 owner_type = GID_ACE; 2552 break; 2553 case SMB_ACL_GROUP: 2554 { 2555 gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry); 2556 if (pgid == NULL) { 2557 DEBUG(0,("canonicalise_acl: Failed to get gid.\n")); 2558 continue; 2559 } 2560 gid_to_sid( &sid, *pgid); 2561 unix_ug.gid = *pgid; 2562 owner_type = GID_ACE; 2563 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype); 2564 break; 2565 } 2566 case SMB_ACL_MASK: 2567 acl_mask = convert_permset_to_mode_t(conn, permset); 2568 continue; /* Don't count the mask as an entry. */ 2569 case SMB_ACL_OTHER: 2570 /* Use the Everyone SID */ 2571 sid = global_sid_World; 2572 unix_ug.world = -1; 2573 owner_type = WORLD_ACE; 2574 break; 2575 default: 2576 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype)); 2577 continue; 2578 } 2579 2580 /* 2581 * Add this entry to the list. 2582 */ 2583 2584 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL) 2585 goto fail; 2586 2587 ZERO_STRUCTP(ace); 2588 ace->type = tagtype; 2589 ace->perms = convert_permset_to_mode_t(conn, permset); 2590 ace->attr = ALLOW_ACE; 2591 ace->trustee = sid; 2592 ace->unix_ug = unix_ug; 2593 ace->owner_type = owner_type; 2594 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT)); 2595 2596 DLIST_ADD(l_head, ace); 2597 } 2598 2599 /* 2600 * This next call will ensure we have at least a user/group/world set. 2601 */ 2602 2603 if (!ensure_canon_entry_valid(&l_head, conn->params, 2604 S_ISDIR(psbuf->st_ex_mode), powner, pgroup, 2605 psbuf, False)) 2606 goto fail; 2607 2608 /* 2609 * Now go through the list, masking the permissions with the 2610 * acl_mask. Ensure all DENY Entries are at the start of the list. 2611 */ 2612 2613 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" )); 2614 2615 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) { 2616 next_ace = ace->next; 2617 2618 /* Masks are only applied to entries other than USER_OBJ and OTHER. */ 2619 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ) 2620 ace->perms &= acl_mask; 2621 2622 if (ace->perms == 0) { 2623 DLIST_PROMOTE(l_head, ace); 2624 } 2625 2626 if( DEBUGLVL( 10 ) ) { 2627 print_canon_ace(ace, ace_count); 2628 } 2629 } 2630 2631 arrange_posix_perms(fname,&l_head ); 2632 2633 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head ); 2634 2635 return l_head; 2636 2637 fail: 2638 2639 free_canon_ace_list(l_head); 2640 return NULL; 2641} 2642 2643/**************************************************************************** 2644 Check if the current user group list contains a given group. 2645****************************************************************************/ 2646 2647static bool current_user_in_group(gid_t gid) 2648{ 2649 int i; 2650 2651 for (i = 0; i < current_user.ut.ngroups; i++) { 2652 if (current_user.ut.groups[i] == gid) { 2653 return True; 2654 } 2655 } 2656 2657 return False; 2658} 2659 2660/**************************************************************************** 2661 Should we override a deny ? Check 'acl group control' and 'dos filemode'. 2662****************************************************************************/ 2663 2664static bool acl_group_override(connection_struct *conn, 2665 const struct smb_filename *smb_fname) 2666{ 2667 if ((errno != EPERM) && (errno != EACCES)) { 2668 return false; 2669 } 2670 2671 /* file primary group == user primary or supplementary group */ 2672 if (lp_acl_group_control(SNUM(conn)) && 2673 current_user_in_group(smb_fname->st.st_ex_gid)) { 2674 return true; 2675 } 2676 2677 /* user has writeable permission */ 2678 if (lp_dos_filemode(SNUM(conn)) && 2679 can_write_to_file(conn, smb_fname)) { 2680 return true; 2681 } 2682 2683 return false; 2684} 2685 2686/**************************************************************************** 2687 Attempt to apply an ACL to a file or directory. 2688****************************************************************************/ 2689 2690static bool set_canon_ace_list(files_struct *fsp, 2691 canon_ace *the_ace, 2692 bool default_ace, 2693 const SMB_STRUCT_STAT *psbuf, 2694 bool *pacl_set_support) 2695{ 2696 connection_struct *conn = fsp->conn; 2697 bool ret = False; 2698 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1); 2699 canon_ace *p_ace; 2700 int i; 2701 SMB_ACL_ENTRY_T mask_entry; 2702 bool got_mask_entry = False; 2703 SMB_ACL_PERMSET_T mask_permset; 2704 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS); 2705 bool needs_mask = False; 2706 mode_t mask_perms = 0; 2707 2708 /* Use the psbuf that was passed in. */ 2709 if (psbuf != &fsp->fsp_name->st) { 2710 fsp->fsp_name->st = *psbuf; 2711 } 2712 2713#if defined(POSIX_ACL_NEEDS_MASK) 2714 /* HP-UX always wants to have a mask (called "class" there). */ 2715 needs_mask = True; 2716#endif 2717 2718 if (the_acl == NULL) { 2719 2720 if (!no_acl_syscall_error(errno)) { 2721 /* 2722 * Only print this error message if we have some kind of ACL 2723 * support that's not working. Otherwise we would always get this. 2724 */ 2725 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n", 2726 default_ace ? "default" : "file", strerror(errno) )); 2727 } 2728 *pacl_set_support = False; 2729 goto fail; 2730 } 2731 2732 if( DEBUGLVL( 10 )) { 2733 dbgtext("set_canon_ace_list: setting ACL:\n"); 2734 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) { 2735 print_canon_ace( p_ace, i); 2736 } 2737 } 2738 2739 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) { 2740 SMB_ACL_ENTRY_T the_entry; 2741 SMB_ACL_PERMSET_T the_permset; 2742 2743 /* 2744 * ACLs only "need" an ACL_MASK entry if there are any named user or 2745 * named group entries. But if there is an ACL_MASK entry, it applies 2746 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask 2747 * so that it doesn't deny (i.e., mask off) any permissions. 2748 */ 2749 2750 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) { 2751 needs_mask = True; 2752 mask_perms |= p_ace->perms; 2753 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) { 2754 mask_perms |= p_ace->perms; 2755 } 2756 2757 /* 2758 * Get the entry for this ACE. 2759 */ 2760 2761 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) { 2762 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n", 2763 i, strerror(errno) )); 2764 goto fail; 2765 } 2766 2767 if (p_ace->type == SMB_ACL_MASK) { 2768 mask_entry = the_entry; 2769 got_mask_entry = True; 2770 } 2771 2772 /* 2773 * Ok - we now know the ACL calls should be working, don't 2774 * allow fallback to chmod. 2775 */ 2776 2777 *pacl_set_support = True; 2778 2779 /* 2780 * Initialise the entry from the canon_ace. 2781 */ 2782 2783 /* 2784 * First tell the entry what type of ACE this is. 2785 */ 2786 2787 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) { 2788 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n", 2789 i, strerror(errno) )); 2790 goto fail; 2791 } 2792 2793 /* 2794 * Only set the qualifier (user or group id) if the entry is a user 2795 * or group id ACE. 2796 */ 2797 2798 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) { 2799 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) { 2800 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n", 2801 i, strerror(errno) )); 2802 goto fail; 2803 } 2804 } 2805 2806 /* 2807 * Convert the mode_t perms in the canon_ace to a POSIX permset. 2808 */ 2809 2810 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) { 2811 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n", 2812 i, strerror(errno) )); 2813 goto fail; 2814 } 2815 2816 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) { 2817 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n", 2818 (unsigned int)p_ace->perms, i, strerror(errno) )); 2819 goto fail; 2820 } 2821 2822 /* 2823 * ..and apply them to the entry. 2824 */ 2825 2826 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) { 2827 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n", 2828 i, strerror(errno) )); 2829 goto fail; 2830 } 2831 2832 if( DEBUGLVL( 10 )) 2833 print_canon_ace( p_ace, i); 2834 2835 } 2836 2837 if (needs_mask && !got_mask_entry) { 2838 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) { 2839 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) )); 2840 goto fail; 2841 } 2842 2843 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) { 2844 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) )); 2845 goto fail; 2846 } 2847 2848 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) { 2849 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) )); 2850 goto fail; 2851 } 2852 2853 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) { 2854 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) )); 2855 goto fail; 2856 } 2857 2858 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) { 2859 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) )); 2860 goto fail; 2861 } 2862 } 2863 2864 /* 2865 * Finally apply it to the file or directory. 2866 */ 2867 2868 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) { 2869 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name, 2870 the_acl_type, the_acl) == -1) { 2871 /* 2872 * Some systems allow all the above calls and only fail with no ACL support 2873 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA. 2874 */ 2875 if (no_acl_syscall_error(errno)) { 2876 *pacl_set_support = False; 2877 } 2878 2879 if (acl_group_override(conn, fsp->fsp_name)) { 2880 int sret; 2881 2882 DEBUG(5,("set_canon_ace_list: acl group " 2883 "control on and current user in file " 2884 "%s primary group.\n", 2885 fsp_str_dbg(fsp))); 2886 2887 become_root(); 2888 sret = SMB_VFS_SYS_ACL_SET_FILE(conn, 2889 fsp->fsp_name->base_name, the_acl_type, 2890 the_acl); 2891 unbecome_root(); 2892 if (sret == 0) { 2893 ret = True; 2894 } 2895 } 2896 2897 if (ret == False) { 2898 DEBUG(2,("set_canon_ace_list: " 2899 "sys_acl_set_file type %s failed for " 2900 "file %s (%s).\n", 2901 the_acl_type == SMB_ACL_TYPE_DEFAULT ? 2902 "directory default" : "file", 2903 fsp_str_dbg(fsp), strerror(errno))); 2904 goto fail; 2905 } 2906 } 2907 } else { 2908 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) { 2909 /* 2910 * Some systems allow all the above calls and only fail with no ACL support 2911 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA. 2912 */ 2913 if (no_acl_syscall_error(errno)) { 2914 *pacl_set_support = False; 2915 } 2916 2917 if (acl_group_override(conn, fsp->fsp_name)) { 2918 int sret; 2919 2920 DEBUG(5,("set_canon_ace_list: acl group " 2921 "control on and current user in file " 2922 "%s primary group.\n", 2923 fsp_str_dbg(fsp))); 2924 2925 become_root(); 2926 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl); 2927 unbecome_root(); 2928 if (sret == 0) { 2929 ret = True; 2930 } 2931 } 2932 2933 if (ret == False) { 2934 DEBUG(2,("set_canon_ace_list: " 2935 "sys_acl_set_file failed for file %s " 2936 "(%s).\n", 2937 fsp_str_dbg(fsp), strerror(errno))); 2938 goto fail; 2939 } 2940 } 2941 } 2942 2943 ret = True; 2944 2945 fail: 2946 2947 if (the_acl != NULL) { 2948 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl); 2949 } 2950 2951 return ret; 2952} 2953 2954/**************************************************************************** 2955 Find a particular canon_ace entry. 2956****************************************************************************/ 2957 2958static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id) 2959{ 2960 while (list) { 2961 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) || 2962 (type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) || 2963 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid))) 2964 break; 2965 list = list->next; 2966 } 2967 return list; 2968} 2969 2970/**************************************************************************** 2971 2972****************************************************************************/ 2973 2974SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl) 2975{ 2976 SMB_ACL_ENTRY_T entry; 2977 2978 if (!the_acl) 2979 return NULL; 2980 if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) { 2981 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl); 2982 return NULL; 2983 } 2984 return the_acl; 2985} 2986 2987/**************************************************************************** 2988 Convert a canon_ace to a generic 3 element permission - if possible. 2989****************************************************************************/ 2990 2991#define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 ) 2992 2993static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms) 2994{ 2995 int snum = SNUM(fsp->conn); 2996 size_t ace_count = count_canon_ace_list(file_ace_list); 2997 canon_ace *ace_p; 2998 canon_ace *owner_ace = NULL; 2999 canon_ace *group_ace = NULL; 3000 canon_ace *other_ace = NULL; 3001 mode_t and_bits; 3002 mode_t or_bits; 3003 3004 if (ace_count != 3) { 3005 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE " 3006 "entries for file %s to convert to posix perms.\n", 3007 fsp_str_dbg(fsp))); 3008 return False; 3009 } 3010 3011 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) { 3012 if (ace_p->owner_type == UID_ACE) 3013 owner_ace = ace_p; 3014 else if (ace_p->owner_type == GID_ACE) 3015 group_ace = ace_p; 3016 else if (ace_p->owner_type == WORLD_ACE) 3017 other_ace = ace_p; 3018 } 3019 3020 if (!owner_ace || !group_ace || !other_ace) { 3021 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get " 3022 "standard entries for file %s.\n", fsp_str_dbg(fsp))); 3023 return False; 3024 } 3025 3026 *posix_perms = (mode_t)0; 3027 3028 *posix_perms |= owner_ace->perms; 3029 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP); 3030 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP); 3031 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP); 3032 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH); 3033 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH); 3034 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH); 3035 3036 /* The owner must have at least read access. */ 3037 3038 *posix_perms |= S_IRUSR; 3039 if (fsp->is_directory) 3040 *posix_perms |= (S_IWUSR|S_IXUSR); 3041 3042 /* If requested apply the masks. */ 3043 3044 /* Get the initial bits to apply. */ 3045 3046 if (fsp->is_directory) { 3047 and_bits = lp_dir_security_mask(snum); 3048 or_bits = lp_force_dir_security_mode(snum); 3049 } else { 3050 and_bits = lp_security_mask(snum); 3051 or_bits = lp_force_security_mode(snum); 3052 } 3053 3054 *posix_perms = (((*posix_perms) & and_bits)|or_bits); 3055 3056 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o " 3057 "to perm=0%o for file %s.\n", (int)owner_ace->perms, 3058 (int)group_ace->perms, (int)other_ace->perms, 3059 (int)*posix_perms, fsp_str_dbg(fsp))); 3060 3061 return True; 3062} 3063 3064/**************************************************************************** 3065 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and 3066 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL 3067 with CI|OI set so it is inherited and also applies to the directory. 3068 Based on code from "Jim McDonough" <jmcd@us.ibm.com>. 3069****************************************************************************/ 3070 3071static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces) 3072{ 3073 size_t i, j; 3074 3075 for (i = 0; i < num_aces; i++) { 3076 for (j = i+1; j < num_aces; j++) { 3077 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE); 3078 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE); 3079 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False; 3080 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False; 3081 3082 /* We know the lower number ACE's are file entries. */ 3083 if ((nt_ace_list[i].type == nt_ace_list[j].type) && 3084 (nt_ace_list[i].size == nt_ace_list[j].size) && 3085 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) && 3086 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) && 3087 (i_inh == j_inh) && 3088 (i_flags_ni == 0) && 3089 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT| 3090 SEC_ACE_FLAG_CONTAINER_INHERIT| 3091 SEC_ACE_FLAG_INHERIT_ONLY))) { 3092 /* 3093 * W2K wants to have access allowed zero access ACE's 3094 * at the end of the list. If the mask is zero, merge 3095 * the non-inherited ACE onto the inherited ACE. 3096 */ 3097 3098 if (nt_ace_list[i].access_mask == 0) { 3099 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT| 3100 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0); 3101 if (num_aces - i - 1 > 0) 3102 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) * 3103 sizeof(SEC_ACE)); 3104 3105 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n", 3106 (unsigned int)i, (unsigned int)j )); 3107 } else { 3108 /* 3109 * These are identical except for the flags. 3110 * Merge the inherited ACE onto the non-inherited ACE. 3111 */ 3112 3113 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT| 3114 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0); 3115 if (num_aces - j - 1 > 0) 3116 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) * 3117 sizeof(SEC_ACE)); 3118 3119 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n", 3120 (unsigned int)j, (unsigned int)i )); 3121 } 3122 num_aces--; 3123 break; 3124 } 3125 } 3126 } 3127 3128 return num_aces; 3129} 3130 3131/* 3132 * Add or Replace ACE entry. 3133 * In some cases we need to add a specific ACE for compatibility reasons. 3134 * When doing that we must make sure we are not actually creating a duplicate 3135 * entry. So we need to search whether an ACE entry already exist and eventually 3136 * replacce the access mask, or add a completely new entry if none was found. 3137 * 3138 * This function assumes the array has enough space to add a new entry without 3139 * any reallocation of memory. 3140 */ 3141 3142static void add_or_replace_ace(SEC_ACE *nt_ace_list, size_t *num_aces, 3143 const DOM_SID *sid, enum security_ace_type type, 3144 uint32_t mask, uint8_t flags) 3145{ 3146 int i; 3147 3148 /* first search for a duplicate */ 3149 for (i = 0; i < *num_aces; i++) { 3150 if (sid_equal(&nt_ace_list[i].trustee, sid) && 3151 (nt_ace_list[i].flags == flags)) break; 3152 } 3153 3154 if (i < *num_aces) { /* found */ 3155 nt_ace_list[i].type = type; 3156 nt_ace_list[i].access_mask = mask; 3157 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n", 3158 i, sid_string_dbg(sid), flags)); 3159 return; 3160 } 3161 3162 /* not found, append it */ 3163 init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags); 3164} 3165 3166 3167/**************************************************************************** 3168 Reply to query a security descriptor from an fsp. If it succeeds it allocates 3169 the space for the return elements and returns the size needed to return the 3170 security descriptor. This should be the only external function needed for 3171 the UNIX style get ACL. 3172****************************************************************************/ 3173 3174static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn, 3175 const char *name, 3176 const SMB_STRUCT_STAT *sbuf, 3177 struct pai_val *pal, 3178 SMB_ACL_T posix_acl, 3179 SMB_ACL_T def_acl, 3180 uint32_t security_info, 3181 SEC_DESC **ppdesc) 3182{ 3183 DOM_SID owner_sid; 3184 DOM_SID group_sid; 3185 size_t sd_size = 0; 3186 SEC_ACL *psa = NULL; 3187 size_t num_acls = 0; 3188 size_t num_def_acls = 0; 3189 size_t num_aces = 0; 3190 canon_ace *file_ace = NULL; 3191 canon_ace *dir_ace = NULL; 3192 SEC_ACE *nt_ace_list = NULL; 3193 size_t num_profile_acls = 0; 3194 DOM_SID orig_owner_sid; 3195 SEC_DESC *psd = NULL; 3196 int i; 3197 3198 /* 3199 * Get the owner, group and world SIDs. 3200 */ 3201 3202 create_file_sids(sbuf, &owner_sid, &group_sid); 3203 3204 if (lp_profile_acls(SNUM(conn))) { 3205 /* For WXP SP1 the owner must be administrators. */ 3206 sid_copy(&orig_owner_sid, &owner_sid); 3207 sid_copy(&owner_sid, &global_sid_Builtin_Administrators); 3208 sid_copy(&group_sid, &global_sid_Builtin_Users); 3209 num_profile_acls = 3; 3210 } 3211 3212 if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) { 3213 3214 /* 3215 * In the optimum case Creator Owner and Creator Group would be used for 3216 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this 3217 * would lead to usability problems under Windows: The Creator entries 3218 * are only available in browse lists of directories and not for files; 3219 * additionally the identity of the owning group couldn't be determined. 3220 * We therefore use those identities only for Default ACLs. 3221 */ 3222 3223 /* Create the canon_ace lists. */ 3224 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf, 3225 &owner_sid, &group_sid, pal, 3226 SMB_ACL_TYPE_ACCESS); 3227 3228 /* We must have *some* ACLS. */ 3229 3230 if (count_canon_ace_list(file_ace) == 0) { 3231 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name)); 3232 goto done; 3233 } 3234 3235 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) { 3236 dir_ace = canonicalise_acl(conn, name, def_acl, 3237 sbuf, 3238 &global_sid_Creator_Owner, 3239 &global_sid_Creator_Group, 3240 pal, SMB_ACL_TYPE_DEFAULT); 3241 } 3242 3243 /* 3244 * Create the NT ACE list from the canonical ace lists. 3245 */ 3246 3247 { 3248 canon_ace *ace; 3249 enum security_ace_type nt_acl_type; 3250 3251 if (nt4_compatible_acls() && dir_ace) { 3252 /* 3253 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry 3254 * but no non-INHERIT_ONLY entry for one SID. So we only 3255 * remove entries from the Access ACL if the 3256 * corresponding Default ACL entries have also been 3257 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP 3258 * are exceptions. We can do nothing 3259 * intelligent if the Default ACL contains entries that 3260 * are not also contained in the Access ACL, so this 3261 * case will still fail under NT 4. 3262 */ 3263 3264 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL); 3265 if (ace && !ace->perms) { 3266 DLIST_REMOVE(dir_ace, ace); 3267 SAFE_FREE(ace); 3268 3269 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL); 3270 if (ace && !ace->perms) { 3271 DLIST_REMOVE(file_ace, ace); 3272 SAFE_FREE(ace); 3273 } 3274 } 3275 3276 /* 3277 * WinNT doesn't usually have Creator Group 3278 * in browse lists, so we send this entry to 3279 * WinNT even if it contains no relevant 3280 * permissions. Once we can add 3281 * Creator Group to browse lists we can 3282 * re-enable this. 3283 */ 3284 3285#if 0 3286 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL); 3287 if (ace && !ace->perms) { 3288 DLIST_REMOVE(dir_ace, ace); 3289 SAFE_FREE(ace); 3290 } 3291#endif 3292 3293 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL); 3294 if (ace && !ace->perms) { 3295 DLIST_REMOVE(file_ace, ace); 3296 SAFE_FREE(ace); 3297 } 3298 } 3299 3300 num_acls = count_canon_ace_list(file_ace); 3301 num_def_acls = count_canon_ace_list(dir_ace); 3302 3303 /* Allocate the ace list. */ 3304 if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) { 3305 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n")); 3306 goto done; 3307 } 3308 3309 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) ); 3310 3311 /* 3312 * Create the NT ACE list from the canonical ace lists. 3313 */ 3314 3315 for (ace = file_ace; ace != NULL; ace = ace->next) { 3316 uint32_t acc = map_canon_ace_perms(SNUM(conn), 3317 &nt_acl_type, 3318 ace->perms, 3319 S_ISDIR(sbuf->st_ex_mode)); 3320 init_sec_ace(&nt_ace_list[num_aces++], 3321 &ace->trustee, 3322 nt_acl_type, 3323 acc, 3324 ace->ace_flags); 3325 } 3326 3327 /* The User must have access to a profile share - even 3328 * if we can't map the SID. */ 3329 if (lp_profile_acls(SNUM(conn))) { 3330 add_or_replace_ace(nt_ace_list, &num_aces, 3331 &global_sid_Builtin_Users, 3332 SEC_ACE_TYPE_ACCESS_ALLOWED, 3333 FILE_GENERIC_ALL, 0); 3334 } 3335 3336 for (ace = dir_ace; ace != NULL; ace = ace->next) { 3337 uint32_t acc = map_canon_ace_perms(SNUM(conn), 3338 &nt_acl_type, 3339 ace->perms, 3340 S_ISDIR(sbuf->st_ex_mode)); 3341 init_sec_ace(&nt_ace_list[num_aces++], 3342 &ace->trustee, 3343 nt_acl_type, 3344 acc, 3345 ace->ace_flags | 3346 SEC_ACE_FLAG_OBJECT_INHERIT| 3347 SEC_ACE_FLAG_CONTAINER_INHERIT| 3348 SEC_ACE_FLAG_INHERIT_ONLY); 3349 } 3350 3351 /* The User must have access to a profile share - even 3352 * if we can't map the SID. */ 3353 if (lp_profile_acls(SNUM(conn))) { 3354 add_or_replace_ace(nt_ace_list, &num_aces, 3355 &global_sid_Builtin_Users, 3356 SEC_ACE_TYPE_ACCESS_ALLOWED, 3357 FILE_GENERIC_ALL, 3358 SEC_ACE_FLAG_OBJECT_INHERIT | 3359 SEC_ACE_FLAG_CONTAINER_INHERIT | 3360 SEC_ACE_FLAG_INHERIT_ONLY); 3361 } 3362 3363 /* 3364 * Merge POSIX default ACLs and normal ACLs into one NT ACE. 3365 * Win2K needs this to get the inheritance correct when replacing ACLs 3366 * on a directory tree. Based on work by Jim @ IBM. 3367 */ 3368 3369 num_aces = merge_default_aces(nt_ace_list, num_aces); 3370 3371 if (lp_profile_acls(SNUM(conn))) { 3372 for (i = 0; i < num_aces; i++) { 3373 if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) { 3374 add_or_replace_ace(nt_ace_list, &num_aces, 3375 &orig_owner_sid, 3376 nt_ace_list[i].type, 3377 nt_ace_list[i].access_mask, 3378 nt_ace_list[i].flags); 3379 break; 3380 } 3381 } 3382 } 3383 } 3384 3385 if (num_aces) { 3386 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) { 3387 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n")); 3388 goto done; 3389 } 3390 } 3391 } /* security_info & DACL_SECURITY_INFORMATION */ 3392 3393 psd = make_standard_sec_desc( talloc_tos(), 3394 (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL, 3395 (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL, 3396 psa, 3397 &sd_size); 3398 3399 if(!psd) { 3400 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n")); 3401 sd_size = 0; 3402 goto done; 3403 } 3404 3405 /* 3406 * Windows 2000: The DACL_PROTECTED flag in the security 3407 * descriptor marks the ACL as non-inheriting, i.e., no 3408 * ACEs from higher level directories propagate to this 3409 * ACL. In the POSIX ACL model permissions are only 3410 * inherited at file create time, so ACLs never contain 3411 * any ACEs that are inherited dynamically. The DACL_PROTECTED 3412 * flag doesn't seem to bother Windows NT. 3413 * Always set this if map acl inherit is turned off. 3414 */ 3415 if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) { 3416 psd->type |= SEC_DESC_DACL_PROTECTED; 3417 } else { 3418 psd->type |= pal->sd_type; 3419 } 3420 3421 if (psd->dacl) { 3422 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces); 3423 } 3424 3425 *ppdesc = psd; 3426 3427 done: 3428 3429 if (posix_acl) { 3430 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl); 3431 } 3432 if (def_acl) { 3433 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl); 3434 } 3435 free_canon_ace_list(file_ace); 3436 free_canon_ace_list(dir_ace); 3437 free_inherited_info(pal); 3438 SAFE_FREE(nt_ace_list); 3439 3440 return NT_STATUS_OK; 3441} 3442 3443NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info, 3444 SEC_DESC **ppdesc) 3445{ 3446 SMB_STRUCT_STAT sbuf; 3447 SMB_ACL_T posix_acl = NULL; 3448 struct pai_val *pal; 3449 3450 *ppdesc = NULL; 3451 3452 DEBUG(10,("posix_fget_nt_acl: called for file %s\n", 3453 fsp_str_dbg(fsp))); 3454 3455 /* can it happen that fsp_name == NULL ? */ 3456 if (fsp->is_directory || fsp->fh->fd == -1) { 3457 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name, 3458 security_info, ppdesc); 3459 } 3460 3461 /* Get the stat struct for the owner info. */ 3462 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) { 3463 return map_nt_error_from_unix(errno); 3464 } 3465 3466 /* Get the ACL from the fd. */ 3467 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp); 3468 3469 pal = fload_inherited_info(fsp); 3470 3471 return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name, 3472 &sbuf, pal, posix_acl, NULL, 3473 security_info, ppdesc); 3474} 3475 3476NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name, 3477 uint32_t security_info, SEC_DESC **ppdesc) 3478{ 3479 SMB_ACL_T posix_acl = NULL; 3480 SMB_ACL_T def_acl = NULL; 3481 struct pai_val *pal; 3482 struct smb_filename smb_fname; 3483 int ret; 3484 3485 *ppdesc = NULL; 3486 3487 DEBUG(10,("posix_get_nt_acl: called for file %s\n", name )); 3488 3489 ZERO_STRUCT(smb_fname); 3490 smb_fname.base_name = discard_const_p(char, name); 3491 3492 /* Get the stat struct for the owner info. */ 3493 if (lp_posix_pathnames()) { 3494 ret = SMB_VFS_LSTAT(conn, &smb_fname); 3495 } else { 3496 ret = SMB_VFS_STAT(conn, &smb_fname); 3497 } 3498 3499 if (ret == -1) { 3500 return map_nt_error_from_unix(errno); 3501 } 3502 3503 /* Get the ACL from the path. */ 3504 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS); 3505 3506 /* If it's a directory get the default POSIX ACL. */ 3507 if(S_ISDIR(smb_fname.st.st_ex_mode)) { 3508 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT); 3509 def_acl = free_empty_sys_acl(conn, def_acl); 3510 } 3511 3512 pal = load_inherited_info(conn, name); 3513 3514 return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal, 3515 posix_acl, def_acl, security_info, 3516 ppdesc); 3517} 3518 3519/**************************************************************************** 3520 Try to chown a file. We will be able to chown it under the following conditions. 3521 3522 1) If we have root privileges, then it will just work. 3523 2) If we have SeTakeOwnershipPrivilege we can change the user to the current user. 3524 3) If we have SeRestorePrivilege we can change the user to any other user. 3525 4) If we have write permission to the file and dos_filemodes is set 3526 then allow chown to the currently authenticated user. 3527****************************************************************************/ 3528 3529int try_chown(connection_struct *conn, struct smb_filename *smb_fname, 3530 uid_t uid, gid_t gid) 3531{ 3532 int ret; 3533 files_struct *fsp; 3534 3535 if(!CAN_WRITE(conn)) { 3536 return -1; 3537 } 3538 3539 /* Case (1). */ 3540 /* try the direct way first */ 3541 if (lp_posix_pathnames()) { 3542 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid, gid); 3543 } else { 3544 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid, gid); 3545 } 3546 3547 if (ret == 0) 3548 return 0; 3549 3550 /* Case (2) / (3) */ 3551 if (lp_enable_privileges()) { 3552 3553 bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token, 3554 &se_take_ownership); 3555 bool has_restore_priv = user_has_privileges(current_user.nt_user_token, 3556 &se_restore); 3557 3558 /* Case (2) */ 3559 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) || 3560 /* Case (3) */ 3561 ( has_restore_priv ) ) { 3562 3563 become_root(); 3564 /* Keep the current file gid the same - take ownership doesn't imply group change. */ 3565 if (lp_posix_pathnames()) { 3566 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid, 3567 (gid_t)-1); 3568 } else { 3569 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid, 3570 (gid_t)-1); 3571 } 3572 unbecome_root(); 3573 return ret; 3574 } 3575 } 3576 3577 /* Case (4). */ 3578 if (!lp_dos_filemode(SNUM(conn))) { 3579 errno = EPERM; 3580 return -1; 3581 } 3582 3583 /* only allow chown to the current user. This is more secure, 3584 and also copes with the case where the SID in a take ownership ACL is 3585 a local SID on the users workstation 3586 */ 3587 if (uid != current_user.ut.uid) { 3588 errno = EPERM; 3589 return -1; 3590 } 3591 3592 if (lp_posix_pathnames()) { 3593 ret = SMB_VFS_LSTAT(conn, smb_fname); 3594 } else { 3595 ret = SMB_VFS_STAT(conn, smb_fname); 3596 } 3597 3598 if (ret == -1) { 3599 return -1; 3600 } 3601 3602 if (!NT_STATUS_IS_OK(open_file_fchmod(conn, smb_fname, &fsp))) { 3603 return -1; 3604 } 3605 3606 become_root(); 3607 /* Keep the current file gid the same. */ 3608 if (fsp->fh->fd == -1) { 3609 if (lp_posix_pathnames()) { 3610 ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid, 3611 (gid_t)-1); 3612 } else { 3613 ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid, 3614 (gid_t)-1); 3615 } 3616 } else { 3617 ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1); 3618 } 3619 unbecome_root(); 3620 3621 close_file(NULL, fsp, NORMAL_CLOSE); 3622 3623 return ret; 3624} 3625 3626#if 0 3627/* Disable this - prevents ACL inheritance from the ACL editor. JRA. */ 3628 3629/**************************************************************************** 3630 Take care of parent ACL inheritance. 3631****************************************************************************/ 3632 3633NTSTATUS append_parent_acl(files_struct *fsp, 3634 const SEC_DESC *pcsd, 3635 SEC_DESC **pp_new_sd) 3636{ 3637 struct smb_filename *smb_dname = NULL; 3638 SEC_DESC *parent_sd = NULL; 3639 files_struct *parent_fsp = NULL; 3640 TALLOC_CTX *mem_ctx = talloc_tos(); 3641 char *parent_name = NULL; 3642 SEC_ACE *new_ace = NULL; 3643 unsigned int num_aces = pcsd->dacl->num_aces; 3644 NTSTATUS status; 3645 int info; 3646 unsigned int i, j; 3647 SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd); 3648 bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED); 3649 3650 if (psd == NULL) { 3651 return NT_STATUS_NO_MEMORY; 3652 } 3653 3654 if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name, 3655 NULL)) { 3656 return NT_STATUS_NO_MEMORY; 3657 } 3658 3659 status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL, 3660 &smb_dname); 3661 if (!NT_STATUS_IS_OK(status)) { 3662 goto fail; 3663 } 3664 3665 status = SMB_VFS_CREATE_FILE( 3666 fsp->conn, /* conn */ 3667 NULL, /* req */ 3668 0, /* root_dir_fid */ 3669 smb_dname, /* fname */ 3670 FILE_READ_ATTRIBUTES, /* access_mask */ 3671 FILE_SHARE_NONE, /* share_access */ 3672 FILE_OPEN, /* create_disposition*/ 3673 FILE_DIRECTORY_FILE, /* create_options */ 3674 0, /* file_attributes */ 3675 INTERNAL_OPEN_ONLY, /* oplock_request */ 3676 0, /* allocation_size */ 3677 NULL, /* sd */ 3678 NULL, /* ea_list */ 3679 &parent_fsp, /* result */ 3680 &info); /* pinfo */ 3681 3682 if (!NT_STATUS_IS_OK(status)) { 3683 TALLOC_FREE(smb_dname); 3684 return status; 3685 } 3686 3687 status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name, 3688 DACL_SECURITY_INFORMATION, &parent_sd ); 3689 3690 close_file(NULL, parent_fsp, NORMAL_CLOSE); 3691 TALLOC_FREE(smb_dname); 3692 3693 if (!NT_STATUS_IS_OK(status)) { 3694 return status; 3695 } 3696 3697 /* 3698 * Make room for potentially all the ACLs from 3699 * the parent. We used to add the ugw triple here, 3700 * as we knew we were dealing with POSIX ACLs. 3701 * We no longer need to do so as we can guarentee 3702 * that a default ACL from the parent directory will 3703 * be well formed for POSIX ACLs if it came from a 3704 * POSIX ACL source, and if we're not writing to a 3705 * POSIX ACL sink then we don't care if it's not well 3706 * formed. JRA. 3707 */ 3708 3709 num_aces += parent_sd->dacl->num_aces; 3710 3711 if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE, 3712 num_aces)) == NULL) { 3713 return NT_STATUS_NO_MEMORY; 3714 } 3715 3716 /* Start by copying in all the given ACE entries. */ 3717 for (i = 0; i < psd->dacl->num_aces; i++) { 3718 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]); 3719 } 3720 3721 /* 3722 * Note that we're ignoring "inherit permissions" here 3723 * as that really only applies to newly created files. JRA. 3724 */ 3725 3726 /* Finally append any inherited ACEs. */ 3727 for (j = 0; j < parent_sd->dacl->num_aces; j++) { 3728 SEC_ACE *se = &parent_sd->dacl->aces[j]; 3729 3730 if (fsp->is_directory) { 3731 if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) { 3732 /* Doesn't apply to a directory - ignore. */ 3733 DEBUG(10,("append_parent_acl: directory %s " 3734 "ignoring non container " 3735 "inherit flags %u on ACE with sid %s " 3736 "from parent %s\n", 3737 fsp_str_dbg(fsp), 3738 (unsigned int)se->flags, 3739 sid_string_dbg(&se->trustee), 3740 parent_name)); 3741 continue; 3742 } 3743 } else { 3744 if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) { 3745 /* Doesn't apply to a file - ignore. */ 3746 DEBUG(10,("append_parent_acl: file %s " 3747 "ignoring non object " 3748 "inherit flags %u on ACE with sid %s " 3749 "from parent %s\n", 3750 fsp_str_dbg(fsp), 3751 (unsigned int)se->flags, 3752 sid_string_dbg(&se->trustee), 3753 parent_name)); 3754 continue; 3755 } 3756 } 3757 3758 if (is_dacl_protected) { 3759 /* If the DACL is protected it means we must 3760 * not overwrite an existing ACE entry with the 3761 * same SID. This is order N^2. Ouch :-(. JRA. */ 3762 unsigned int k; 3763 for (k = 0; k < psd->dacl->num_aces; k++) { 3764 if (sid_equal(&psd->dacl->aces[k].trustee, 3765 &se->trustee)) { 3766 break; 3767 } 3768 } 3769 if (k < psd->dacl->num_aces) { 3770 /* SID matched. Ignore. */ 3771 DEBUG(10,("append_parent_acl: path %s " 3772 "ignoring ACE with protected sid %s " 3773 "from parent %s\n", 3774 fsp_str_dbg(fsp), 3775 sid_string_dbg(&se->trustee), 3776 parent_name)); 3777 continue; 3778 } 3779 } 3780 3781 sec_ace_copy(&new_ace[i], se); 3782 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) { 3783 new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT); 3784 } 3785 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE; 3786 3787 if (fsp->is_directory) { 3788 /* 3789 * Strip off any inherit only. It's applied. 3790 */ 3791 new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY); 3792 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) { 3793 /* No further inheritance. */ 3794 new_ace[i].flags &= 3795 ~(SEC_ACE_FLAG_CONTAINER_INHERIT| 3796 SEC_ACE_FLAG_OBJECT_INHERIT); 3797 } 3798 } else { 3799 /* 3800 * Strip off any container or inherit 3801 * flags, they can't apply to objects. 3802 */ 3803 new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT| 3804 SEC_ACE_FLAG_INHERIT_ONLY| 3805 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT); 3806 } 3807 i++; 3808 3809 DEBUG(10,("append_parent_acl: path %s " 3810 "inheriting ACE with sid %s " 3811 "from parent %s\n", 3812 fsp_str_dbg(fsp), 3813 sid_string_dbg(&se->trustee), 3814 parent_name)); 3815 } 3816 3817 psd->dacl->aces = new_ace; 3818 psd->dacl->num_aces = i; 3819 psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED| 3820 SE_DESC_DACL_AUTO_INHERIT_REQ); 3821 3822 *pp_new_sd = psd; 3823 return status; 3824} 3825#endif 3826 3827/**************************************************************************** 3828 Reply to set a security descriptor on an fsp. security_info_sent is the 3829 description of the following NT ACL. 3830 This should be the only external function needed for the UNIX style set ACL. 3831****************************************************************************/ 3832 3833NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const SEC_DESC *psd_orig) 3834{ 3835 connection_struct *conn = fsp->conn; 3836 uid_t user = (uid_t)-1; 3837 gid_t grp = (gid_t)-1; 3838 DOM_SID file_owner_sid; 3839 DOM_SID file_grp_sid; 3840 canon_ace *file_ace_list = NULL; 3841 canon_ace *dir_ace_list = NULL; 3842 bool acl_perms = False; 3843 mode_t orig_mode = (mode_t)0; 3844 NTSTATUS status; 3845 bool set_acl_as_root = false; 3846 bool acl_set_support = false; 3847 bool ret = false; 3848 SEC_DESC *psd = NULL; 3849 3850 DEBUG(10,("set_nt_acl: called for file %s\n", 3851 fsp_str_dbg(fsp))); 3852 3853 if (!CAN_WRITE(conn)) { 3854 DEBUG(10,("set acl rejected on read-only share\n")); 3855 return NT_STATUS_MEDIA_WRITE_PROTECTED; 3856 } 3857 3858 if (!psd_orig) { 3859 return NT_STATUS_INVALID_PARAMETER; 3860 } 3861 3862 psd = dup_sec_desc(talloc_tos(), psd_orig); 3863 if (!psd) { 3864 return NT_STATUS_NO_MEMORY; 3865 } 3866 3867 /* 3868 * Get the current state of the file. 3869 */ 3870 3871 status = vfs_stat_fsp(fsp); 3872 if (!NT_STATUS_IS_OK(status)) { 3873 return status; 3874 } 3875 3876 /* Save the original element we check against. */ 3877 orig_mode = fsp->fsp_name->st.st_ex_mode; 3878 3879 /* 3880 * Unpack the user/group/world id's. 3881 */ 3882 3883 /* POSIX can't cope with missing owner/group. */ 3884 if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) { 3885 security_info_sent &= ~SECINFO_OWNER; 3886 } 3887 if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) { 3888 security_info_sent &= ~SECINFO_GROUP; 3889 } 3890 3891 status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd); 3892 if (!NT_STATUS_IS_OK(status)) { 3893 return status; 3894 } 3895 3896 /* 3897 * Do we need to chown ? If so this must be done first as the incoming 3898 * CREATOR_OWNER acl will be relative to the *new* owner, not the old. 3899 * Noticed by Simo. 3900 */ 3901 3902 if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) || 3903 (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) { 3904 3905 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n", 3906 fsp_str_dbg(fsp), (unsigned int)user, 3907 (unsigned int)grp)); 3908 3909 if(try_chown(fsp->conn, fsp->fsp_name, user, grp) == -1) { 3910 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error " 3911 "= %s.\n", fsp_str_dbg(fsp), 3912 (unsigned int)user, (unsigned int)grp, 3913 strerror(errno))); 3914 if (errno == EPERM) { 3915 return NT_STATUS_INVALID_OWNER; 3916 } 3917 return map_nt_error_from_unix(errno); 3918 } 3919 3920 /* 3921 * Recheck the current state of the file, which may have changed. 3922 * (suid/sgid bits, for instance) 3923 */ 3924 3925 status = vfs_stat_fsp(fsp); 3926 if (!NT_STATUS_IS_OK(status)) { 3927 return status; 3928 } 3929 3930 /* Save the original element we check against. */ 3931 orig_mode = fsp->fsp_name->st.st_ex_mode; 3932 3933 /* If we successfully chowned, we know we must 3934 * be able to set the acl, so do it as root. 3935 */ 3936 set_acl_as_root = true; 3937 } 3938 3939 create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid); 3940 3941 if((security_info_sent & SECINFO_DACL) && 3942 (psd->type & SEC_DESC_DACL_PRESENT) && 3943 (psd->dacl == NULL)) { 3944 SEC_ACE ace[3]; 3945 3946 /* We can't have NULL DACL in POSIX. 3947 Use owner/group/Everyone -> full access. */ 3948 3949 init_sec_ace(&ace[0], 3950 &file_owner_sid, 3951 SEC_ACE_TYPE_ACCESS_ALLOWED, 3952 GENERIC_ALL_ACCESS, 3953 0); 3954 init_sec_ace(&ace[1], 3955 &file_grp_sid, 3956 SEC_ACE_TYPE_ACCESS_ALLOWED, 3957 GENERIC_ALL_ACCESS, 3958 0); 3959 init_sec_ace(&ace[2], 3960 &global_sid_World, 3961 SEC_ACE_TYPE_ACCESS_ALLOWED, 3962 GENERIC_ALL_ACCESS, 3963 0); 3964 psd->dacl = make_sec_acl(talloc_tos(), 3965 NT4_ACL_REVISION, 3966 3, 3967 ace); 3968 if (psd->dacl == NULL) { 3969 return NT_STATUS_NO_MEMORY; 3970 } 3971 security_acl_map_generic(psd->dacl, &file_generic_mapping); 3972 } 3973 3974 acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid, 3975 &file_grp_sid, &file_ace_list, 3976 &dir_ace_list, security_info_sent, psd); 3977 3978 /* Ignore W2K traverse DACL set. */ 3979 if (!file_ace_list && !dir_ace_list) { 3980 return NT_STATUS_OK; 3981 } 3982 3983 if (!acl_perms) { 3984 DEBUG(3,("set_nt_acl: cannot set permissions\n")); 3985 free_canon_ace_list(file_ace_list); 3986 free_canon_ace_list(dir_ace_list); 3987 return NT_STATUS_ACCESS_DENIED; 3988 } 3989 3990 /* 3991 * Only change security if we got a DACL. 3992 */ 3993 3994 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) { 3995 free_canon_ace_list(file_ace_list); 3996 free_canon_ace_list(dir_ace_list); 3997 return NT_STATUS_OK; 3998 } 3999 4000 /* 4001 * Try using the POSIX ACL set first. Fall back to chmod if 4002 * we have no ACL support on this filesystem. 4003 */ 4004 4005 if (acl_perms && file_ace_list) { 4006 if (set_acl_as_root) { 4007 become_root(); 4008 } 4009 ret = set_canon_ace_list(fsp, file_ace_list, false, 4010 &fsp->fsp_name->st, &acl_set_support); 4011 if (set_acl_as_root) { 4012 unbecome_root(); 4013 } 4014 if (acl_set_support && ret == false) { 4015 DEBUG(3,("set_nt_acl: failed to set file acl on file " 4016 "%s (%s).\n", fsp_str_dbg(fsp), 4017 strerror(errno))); 4018 free_canon_ace_list(file_ace_list); 4019 free_canon_ace_list(dir_ace_list); 4020 return map_nt_error_from_unix(errno); 4021 } 4022 } 4023 4024 if (acl_perms && acl_set_support && fsp->is_directory) { 4025 if (dir_ace_list) { 4026 if (set_acl_as_root) { 4027 become_root(); 4028 } 4029 ret = set_canon_ace_list(fsp, dir_ace_list, true, 4030 &fsp->fsp_name->st, 4031 &acl_set_support); 4032 if (set_acl_as_root) { 4033 unbecome_root(); 4034 } 4035 if (ret == false) { 4036 DEBUG(3,("set_nt_acl: failed to set default " 4037 "acl on directory %s (%s).\n", 4038 fsp_str_dbg(fsp), strerror(errno))); 4039 free_canon_ace_list(file_ace_list); 4040 free_canon_ace_list(dir_ace_list); 4041 return map_nt_error_from_unix(errno); 4042 } 4043 } else { 4044 int sret = -1; 4045 4046 /* 4047 * No default ACL - delete one if it exists. 4048 */ 4049 4050 if (set_acl_as_root) { 4051 become_root(); 4052 } 4053 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, 4054 fsp->fsp_name->base_name); 4055 if (set_acl_as_root) { 4056 unbecome_root(); 4057 } 4058 if (sret == -1) { 4059 if (acl_group_override(conn, fsp->fsp_name)) { 4060 DEBUG(5,("set_nt_acl: acl group " 4061 "control on and current user " 4062 "in file %s primary group. " 4063 "Override delete_def_acl\n", 4064 fsp_str_dbg(fsp))); 4065 4066 become_root(); 4067 sret = 4068 SMB_VFS_SYS_ACL_DELETE_DEF_FILE( 4069 conn, 4070 fsp->fsp_name->base_name); 4071 unbecome_root(); 4072 } 4073 4074 if (sret == -1) { 4075 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno))); 4076 free_canon_ace_list(file_ace_list); 4077 free_canon_ace_list(dir_ace_list); 4078 return map_nt_error_from_unix(errno); 4079 } 4080 } 4081 } 4082 } 4083 4084 if (acl_set_support) { 4085 if (set_acl_as_root) { 4086 become_root(); 4087 } 4088 store_inheritance_attributes(fsp, 4089 file_ace_list, 4090 dir_ace_list, 4091 psd->type); 4092 if (set_acl_as_root) { 4093 unbecome_root(); 4094 } 4095 } 4096 4097 /* 4098 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod. 4099 */ 4100 4101 if(!acl_set_support && acl_perms) { 4102 mode_t posix_perms; 4103 4104 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) { 4105 free_canon_ace_list(file_ace_list); 4106 free_canon_ace_list(dir_ace_list); 4107 DEBUG(3,("set_nt_acl: failed to convert file acl to " 4108 "posix permissions for file %s.\n", 4109 fsp_str_dbg(fsp))); 4110 return NT_STATUS_ACCESS_DENIED; 4111 } 4112 4113 if (orig_mode != posix_perms) { 4114 int sret = -1; 4115 4116 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n", 4117 fsp_str_dbg(fsp), (unsigned int)posix_perms)); 4118 4119 if (set_acl_as_root) { 4120 become_root(); 4121 } 4122 sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name, 4123 posix_perms); 4124 if (set_acl_as_root) { 4125 unbecome_root(); 4126 } 4127 if(sret == -1) { 4128 if (acl_group_override(conn, fsp->fsp_name)) { 4129 DEBUG(5,("set_nt_acl: acl group " 4130 "control on and current user " 4131 "in file %s primary group. " 4132 "Override chmod\n", 4133 fsp_str_dbg(fsp))); 4134 4135 become_root(); 4136 sret = SMB_VFS_CHMOD(conn, 4137 fsp->fsp_name->base_name, 4138 posix_perms); 4139 unbecome_root(); 4140 } 4141 4142 if (sret == -1) { 4143 DEBUG(3,("set_nt_acl: chmod %s, 0%o " 4144 "failed. Error = %s.\n", 4145 fsp_str_dbg(fsp), 4146 (unsigned int)posix_perms, 4147 strerror(errno))); 4148 free_canon_ace_list(file_ace_list); 4149 free_canon_ace_list(dir_ace_list); 4150 return map_nt_error_from_unix(errno); 4151 } 4152 } 4153 } 4154 } 4155 4156 free_canon_ace_list(file_ace_list); 4157 free_canon_ace_list(dir_ace_list); 4158 4159 /* Ensure the stat struct in the fsp is correct. */ 4160 status = vfs_stat_fsp(fsp); 4161 4162 return NT_STATUS_OK; 4163} 4164 4165/**************************************************************************** 4166 Get the actual group bits stored on a file with an ACL. Has no effect if 4167 the file has no ACL. Needed in dosmode code where the stat() will return 4168 the mask bits, not the real group bits, for a file with an ACL. 4169****************************************************************************/ 4170 4171int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode ) 4172{ 4173 int entry_id = SMB_ACL_FIRST_ENTRY; 4174 SMB_ACL_ENTRY_T entry; 4175 SMB_ACL_T posix_acl; 4176 int result = -1; 4177 4178 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS); 4179 if (posix_acl == (SMB_ACL_T)NULL) 4180 return -1; 4181 4182 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) { 4183 SMB_ACL_TAG_T tagtype; 4184 SMB_ACL_PERMSET_T permset; 4185 4186 entry_id = SMB_ACL_NEXT_ENTRY; 4187 4188 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1) 4189 break; 4190 4191 if (tagtype == SMB_ACL_GROUP_OBJ) { 4192 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) { 4193 break; 4194 } else { 4195 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP); 4196 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0); 4197 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0); 4198 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0); 4199 result = 0; 4200 break; 4201 } 4202 } 4203 } 4204 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl); 4205 return result; 4206} 4207 4208/**************************************************************************** 4209 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL 4210 and set the mask to rwx. Needed to preserve complex ACLs set by NT. 4211****************************************************************************/ 4212 4213static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode) 4214{ 4215 int entry_id = SMB_ACL_FIRST_ENTRY; 4216 SMB_ACL_ENTRY_T entry; 4217 int num_entries = 0; 4218 4219 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) { 4220 SMB_ACL_TAG_T tagtype; 4221 SMB_ACL_PERMSET_T permset; 4222 mode_t perms; 4223 4224 entry_id = SMB_ACL_NEXT_ENTRY; 4225 4226 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) 4227 return -1; 4228 4229 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) 4230 return -1; 4231 4232 num_entries++; 4233 4234 switch(tagtype) { 4235 case SMB_ACL_USER_OBJ: 4236 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR); 4237 break; 4238 case SMB_ACL_GROUP_OBJ: 4239 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP); 4240 break; 4241 case SMB_ACL_MASK: 4242 /* 4243 * FIXME: The ACL_MASK entry permissions should really be set to 4244 * the union of the permissions of all ACL_USER, 4245 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what 4246 * acl_calc_mask() does, but Samba ACLs doesn't provide it. 4247 */ 4248 perms = S_IRUSR|S_IWUSR|S_IXUSR; 4249 break; 4250 case SMB_ACL_OTHER: 4251 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH); 4252 break; 4253 default: 4254 continue; 4255 } 4256 4257 if (map_acl_perms_to_permset(conn, perms, &permset) == -1) 4258 return -1; 4259 4260 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1) 4261 return -1; 4262 } 4263 4264 /* 4265 * If this is a simple 3 element ACL or no elements then it's a standard 4266 * UNIX permission set. Just use chmod... 4267 */ 4268 4269 if ((num_entries == 3) || (num_entries == 0)) 4270 return -1; 4271 4272 return 0; 4273} 4274 4275/**************************************************************************** 4276 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ, 4277 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the 4278 resulting ACL on TO. Note that name is in UNIX character set. 4279****************************************************************************/ 4280 4281static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode) 4282{ 4283 SMB_ACL_T posix_acl = NULL; 4284 int ret = -1; 4285 4286 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL) 4287 return -1; 4288 4289 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1) 4290 goto done; 4291 4292 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl); 4293 4294 done: 4295 4296 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl); 4297 return ret; 4298} 4299 4300/**************************************************************************** 4301 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL 4302 and set the mask to rwx. Needed to preserve complex ACLs set by NT. 4303 Note that name is in UNIX character set. 4304****************************************************************************/ 4305 4306int chmod_acl(connection_struct *conn, const char *name, mode_t mode) 4307{ 4308 return copy_access_posix_acl(conn, name, name, mode); 4309} 4310 4311/**************************************************************************** 4312 Check for an existing default POSIX ACL on a directory. 4313****************************************************************************/ 4314 4315static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname) 4316{ 4317 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT); 4318 bool has_acl = False; 4319 SMB_ACL_ENTRY_T entry; 4320 4321 if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) { 4322 has_acl = True; 4323 } 4324 4325 if (def_acl) { 4326 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl); 4327 } 4328 return has_acl; 4329} 4330 4331/**************************************************************************** 4332 If the parent directory has no default ACL but it does have an Access ACL, 4333 inherit this Access ACL to file name. 4334****************************************************************************/ 4335 4336int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir, 4337 const char *name, mode_t mode) 4338{ 4339 if (directory_has_default_posix_acl(conn, inherit_from_dir)) 4340 return 0; 4341 4342 return copy_access_posix_acl(conn, inherit_from_dir, name, mode); 4343} 4344 4345/**************************************************************************** 4346 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL 4347 and set the mask to rwx. Needed to preserve complex ACLs set by NT. 4348****************************************************************************/ 4349 4350int fchmod_acl(files_struct *fsp, mode_t mode) 4351{ 4352 connection_struct *conn = fsp->conn; 4353 SMB_ACL_T posix_acl = NULL; 4354 int ret = -1; 4355 4356 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL) 4357 return -1; 4358 4359 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1) 4360 goto done; 4361 4362 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl); 4363 4364 done: 4365 4366 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl); 4367 return ret; 4368} 4369 4370/**************************************************************************** 4371 Map from wire type to permset. 4372****************************************************************************/ 4373 4374static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset) 4375{ 4376 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) { 4377 return False; 4378 } 4379 4380 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) { 4381 return False; 4382 } 4383 4384 if (wire_perm & SMB_POSIX_ACL_READ) { 4385 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) { 4386 return False; 4387 } 4388 } 4389 if (wire_perm & SMB_POSIX_ACL_WRITE) { 4390 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) { 4391 return False; 4392 } 4393 } 4394 if (wire_perm & SMB_POSIX_ACL_EXECUTE) { 4395 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) { 4396 return False; 4397 } 4398 } 4399 return True; 4400} 4401 4402/**************************************************************************** 4403 Map from wire type to tagtype. 4404****************************************************************************/ 4405 4406static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt) 4407{ 4408 switch (wire_tt) { 4409 case SMB_POSIX_ACL_USER_OBJ: 4410 *p_tt = SMB_ACL_USER_OBJ; 4411 break; 4412 case SMB_POSIX_ACL_USER: 4413 *p_tt = SMB_ACL_USER; 4414 break; 4415 case SMB_POSIX_ACL_GROUP_OBJ: 4416 *p_tt = SMB_ACL_GROUP_OBJ; 4417 break; 4418 case SMB_POSIX_ACL_GROUP: 4419 *p_tt = SMB_ACL_GROUP; 4420 break; 4421 case SMB_POSIX_ACL_MASK: 4422 *p_tt = SMB_ACL_MASK; 4423 break; 4424 case SMB_POSIX_ACL_OTHER: 4425 *p_tt = SMB_ACL_OTHER; 4426 break; 4427 default: 4428 return False; 4429 } 4430 return True; 4431} 4432 4433/**************************************************************************** 4434 Create a new POSIX acl from wire permissions. 4435 FIXME ! How does the share mask/mode fit into this.... ? 4436****************************************************************************/ 4437 4438static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata) 4439{ 4440 unsigned int i; 4441 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls); 4442 4443 if (the_acl == NULL) { 4444 return NULL; 4445 } 4446 4447 for (i = 0; i < num_acls; i++) { 4448 SMB_ACL_ENTRY_T the_entry; 4449 SMB_ACL_PERMSET_T the_permset; 4450 SMB_ACL_TAG_T tag_type; 4451 4452 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) { 4453 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n", 4454 i, strerror(errno) )); 4455 goto fail; 4456 } 4457 4458 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) { 4459 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n", 4460 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i )); 4461 goto fail; 4462 } 4463 4464 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) { 4465 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n", 4466 i, strerror(errno) )); 4467 goto fail; 4468 } 4469 4470 /* Get the permset pointer from the new ACL entry. */ 4471 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) { 4472 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n", 4473 i, strerror(errno) )); 4474 goto fail; 4475 } 4476 4477 /* Map from wire to permissions. */ 4478 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) { 4479 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n", 4480 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i )); 4481 goto fail; 4482 } 4483 4484 /* Now apply to the new ACL entry. */ 4485 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) { 4486 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n", 4487 i, strerror(errno) )); 4488 goto fail; 4489 } 4490 4491 if (tag_type == SMB_ACL_USER) { 4492 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2); 4493 uid_t uid = (uid_t)uidval; 4494 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) { 4495 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n", 4496 (unsigned int)uid, i, strerror(errno) )); 4497 goto fail; 4498 } 4499 } 4500 4501 if (tag_type == SMB_ACL_GROUP) { 4502 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2); 4503 gid_t gid = (uid_t)gidval; 4504 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) { 4505 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n", 4506 (unsigned int)gid, i, strerror(errno) )); 4507 goto fail; 4508 } 4509 } 4510 } 4511 4512 return the_acl; 4513 4514 fail: 4515 4516 if (the_acl != NULL) { 4517 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl); 4518 } 4519 return NULL; 4520} 4521 4522/**************************************************************************** 4523 Calls from UNIX extensions - Default POSIX ACL set. 4524 If num_def_acls == 0 and not a directory just return. If it is a directory 4525 and num_def_acls == 0 then remove the default acl. Else set the default acl 4526 on the directory. 4527****************************************************************************/ 4528 4529bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf, 4530 uint16 num_def_acls, const char *pdata) 4531{ 4532 SMB_ACL_T def_acl = NULL; 4533 4534 if (!S_ISDIR(psbuf->st_ex_mode)) { 4535 if (num_def_acls) { 4536 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname )); 4537 errno = EISDIR; 4538 return False; 4539 } else { 4540 return True; 4541 } 4542 } 4543 4544 if (!num_def_acls) { 4545 /* Remove the default ACL. */ 4546 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) { 4547 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n", 4548 fname, strerror(errno) )); 4549 return False; 4550 } 4551 return True; 4552 } 4553 4554 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) { 4555 return False; 4556 } 4557 4558 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) { 4559 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n", 4560 fname, strerror(errno) )); 4561 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl); 4562 return False; 4563 } 4564 4565 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname )); 4566 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl); 4567 return True; 4568} 4569 4570/**************************************************************************** 4571 Remove an ACL from a file. As we don't have acl_delete_entry() available 4572 we must read the current acl and copy all entries except MASK, USER and GROUP 4573 to a new acl, then set that. This (at least on Linux) causes any ACL to be 4574 removed. 4575 FIXME ! How does the share mask/mode fit into this.... ? 4576****************************************************************************/ 4577 4578static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname) 4579{ 4580 SMB_ACL_T file_acl = NULL; 4581 int entry_id = SMB_ACL_FIRST_ENTRY; 4582 SMB_ACL_ENTRY_T entry; 4583 bool ret = False; 4584 /* Create a new ACL with only 3 entries, u/g/w. */ 4585 SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3); 4586 SMB_ACL_ENTRY_T user_ent = NULL; 4587 SMB_ACL_ENTRY_T group_ent = NULL; 4588 SMB_ACL_ENTRY_T other_ent = NULL; 4589 4590 if (new_file_acl == NULL) { 4591 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname)); 4592 return False; 4593 } 4594 4595 /* Now create the u/g/w entries. */ 4596 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) { 4597 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n", 4598 fname, strerror(errno) )); 4599 goto done; 4600 } 4601 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) { 4602 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n", 4603 fname, strerror(errno) )); 4604 goto done; 4605 } 4606 4607 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) { 4608 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n", 4609 fname, strerror(errno) )); 4610 goto done; 4611 } 4612 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) { 4613 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n", 4614 fname, strerror(errno) )); 4615 goto done; 4616 } 4617 4618 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) { 4619 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n", 4620 fname, strerror(errno) )); 4621 goto done; 4622 } 4623 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) { 4624 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n", 4625 fname, strerror(errno) )); 4626 goto done; 4627 } 4628 4629 /* Get the current file ACL. */ 4630 if (fsp && fsp->fh->fd != -1) { 4631 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp); 4632 } else { 4633 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS); 4634 } 4635 4636 if (file_acl == NULL) { 4637 /* This is only returned if an error occurred. Even for a file with 4638 no acl a u/g/w acl should be returned. */ 4639 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n", 4640 fname, strerror(errno) )); 4641 goto done; 4642 } 4643 4644 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) { 4645 SMB_ACL_TAG_T tagtype; 4646 SMB_ACL_PERMSET_T permset; 4647 4648 entry_id = SMB_ACL_NEXT_ENTRY; 4649 4650 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) { 4651 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n", 4652 fname, strerror(errno) )); 4653 goto done; 4654 } 4655 4656 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) { 4657 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n", 4658 fname, strerror(errno) )); 4659 goto done; 4660 } 4661 4662 if (tagtype == SMB_ACL_USER_OBJ) { 4663 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) { 4664 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n", 4665 fname, strerror(errno) )); 4666 } 4667 } else if (tagtype == SMB_ACL_GROUP_OBJ) { 4668 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) { 4669 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n", 4670 fname, strerror(errno) )); 4671 } 4672 } else if (tagtype == SMB_ACL_OTHER) { 4673 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) { 4674 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n", 4675 fname, strerror(errno) )); 4676 } 4677 } 4678 } 4679 4680 /* Set the new empty file ACL. */ 4681 if (fsp && fsp->fh->fd != -1) { 4682 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) { 4683 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n", 4684 fname, strerror(errno) )); 4685 goto done; 4686 } 4687 } else { 4688 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) { 4689 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n", 4690 fname, strerror(errno) )); 4691 goto done; 4692 } 4693 } 4694 4695 ret = True; 4696 4697 done: 4698 4699 if (file_acl) { 4700 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl); 4701 } 4702 if (new_file_acl) { 4703 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl); 4704 } 4705 return ret; 4706} 4707 4708/**************************************************************************** 4709 Calls from UNIX extensions - POSIX ACL set. 4710 If num_def_acls == 0 then read/modify/write acl after removing all entries 4711 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER. 4712****************************************************************************/ 4713 4714bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata) 4715{ 4716 SMB_ACL_T file_acl = NULL; 4717 4718 if (!num_acls) { 4719 /* Remove the ACL from the file. */ 4720 return remove_posix_acl(conn, fsp, fname); 4721 } 4722 4723 if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) { 4724 return False; 4725 } 4726 4727 if (fsp && fsp->fh->fd != -1) { 4728 /* The preferred way - use an open fd. */ 4729 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) { 4730 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n", 4731 fname, strerror(errno) )); 4732 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl); 4733 return False; 4734 } 4735 } else { 4736 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) { 4737 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n", 4738 fname, strerror(errno) )); 4739 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl); 4740 return False; 4741 } 4742 } 4743 4744 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname )); 4745 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl); 4746 return True; 4747} 4748 4749/******************************************************************** 4750 Pull the NT ACL from a file on disk or the OpenEventlog() access 4751 check. Caller is responsible for freeing the returned security 4752 descriptor via TALLOC_FREE(). This is designed for dealing with 4753 user space access checks in smbd outside of the VFS. For example, 4754 checking access rights in OpenEventlog(). 4755 4756 Assume we are dealing with files (for now) 4757********************************************************************/ 4758 4759SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname) 4760{ 4761 SEC_DESC *psd, *ret_sd; 4762 connection_struct *conn; 4763 files_struct finfo; 4764 struct fd_handle fh; 4765 NTSTATUS status; 4766 4767 conn = TALLOC_ZERO_P(ctx, connection_struct); 4768 if (conn == NULL) { 4769 DEBUG(0, ("talloc failed\n")); 4770 return NULL; 4771 } 4772 4773 if (!(conn->params = TALLOC_P(conn, struct share_params))) { 4774 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n")); 4775 TALLOC_FREE(conn); 4776 return NULL; 4777 } 4778 4779 conn->params->service = -1; 4780 4781 set_conn_connectpath(conn, "/"); 4782 4783 if (!smbd_vfs_init(conn)) { 4784 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n")); 4785 conn_free(conn); 4786 return NULL; 4787 } 4788 4789 ZERO_STRUCT( finfo ); 4790 ZERO_STRUCT( fh ); 4791 4792 finfo.fnum = -1; 4793 finfo.conn = conn; 4794 finfo.fh = &fh; 4795 finfo.fh->fd = -1; 4796 4797 status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL, 4798 &finfo.fsp_name); 4799 if (!NT_STATUS_IS_OK(status)) { 4800 conn_free(conn); 4801 return NULL; 4802 } 4803 4804 if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) { 4805 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n")); 4806 TALLOC_FREE(finfo.fsp_name); 4807 conn_free(conn); 4808 return NULL; 4809 } 4810 4811 ret_sd = dup_sec_desc( ctx, psd ); 4812 4813 TALLOC_FREE(finfo.fsp_name); 4814 conn_free(conn); 4815 4816 return ret_sd; 4817} 4818 4819/* Stolen shamelessly from pvfs_default_acl() in source4 :-). */ 4820 4821NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx, 4822 const char *name, 4823 SMB_STRUCT_STAT *psbuf, 4824 SEC_DESC **ppdesc) 4825{ 4826 struct dom_sid owner_sid, group_sid; 4827 size_t size = 0; 4828 SEC_ACE aces[4]; 4829 uint32_t access_mask = 0; 4830 mode_t mode = psbuf->st_ex_mode; 4831 SEC_ACL *new_dacl = NULL; 4832 int idx = 0; 4833 4834 DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n", 4835 name, (int)mode )); 4836 4837 uid_to_sid(&owner_sid, psbuf->st_ex_uid); 4838 gid_to_sid(&group_sid, psbuf->st_ex_gid); 4839 4840 /* 4841 We provide up to 4 ACEs 4842 - Owner 4843 - Group 4844 - Everyone 4845 - NT System 4846 */ 4847 4848 if (mode & S_IRUSR) { 4849 if (mode & S_IWUSR) { 4850 access_mask |= SEC_RIGHTS_FILE_ALL; 4851 } else { 4852 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE; 4853 } 4854 } 4855 if (mode & S_IWUSR) { 4856 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE; 4857 } 4858 4859 init_sec_ace(&aces[idx], 4860 &owner_sid, 4861 SEC_ACE_TYPE_ACCESS_ALLOWED, 4862 access_mask, 4863 0); 4864 idx++; 4865 4866 access_mask = 0; 4867 if (mode & S_IRGRP) { 4868 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE; 4869 } 4870 if (mode & S_IWGRP) { 4871 /* note that delete is not granted - this matches posix behaviour */ 4872 access_mask |= SEC_RIGHTS_FILE_WRITE; 4873 } 4874 if (access_mask) { 4875 init_sec_ace(&aces[idx], 4876 &group_sid, 4877 SEC_ACE_TYPE_ACCESS_ALLOWED, 4878 access_mask, 4879 0); 4880 idx++; 4881 } 4882 4883 access_mask = 0; 4884 if (mode & S_IROTH) { 4885 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE; 4886 } 4887 if (mode & S_IWOTH) { 4888 access_mask |= SEC_RIGHTS_FILE_WRITE; 4889 } 4890 if (access_mask) { 4891 init_sec_ace(&aces[idx], 4892 &global_sid_World, 4893 SEC_ACE_TYPE_ACCESS_ALLOWED, 4894 access_mask, 4895 0); 4896 idx++; 4897 } 4898 4899 init_sec_ace(&aces[idx], 4900 &global_sid_System, 4901 SEC_ACE_TYPE_ACCESS_ALLOWED, 4902 SEC_RIGHTS_FILE_ALL, 4903 0); 4904 idx++; 4905 4906 new_dacl = make_sec_acl(ctx, 4907 NT4_ACL_REVISION, 4908 idx, 4909 aces); 4910 4911 if (!new_dacl) { 4912 return NT_STATUS_NO_MEMORY; 4913 } 4914 4915 *ppdesc = make_sec_desc(ctx, 4916 SECURITY_DESCRIPTOR_REVISION_1, 4917 SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT, 4918 &owner_sid, 4919 &group_sid, 4920 NULL, 4921 new_dacl, 4922 &size); 4923 if (!*ppdesc) { 4924 return NT_STATUS_NO_MEMORY; 4925 } 4926 return NT_STATUS_OK; 4927} 4928