subr_acl_nfs4.c revision 226043
1/*- 2 * Copyright (c) 2008-2010 Edward Tomasz Napiera��a <trasz@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27/* 28 * ACL support routines specific to NFSv4 access control lists. These are 29 * utility routines for code common across file systems implementing NFSv4 30 * ACLs. 31 */ 32 33#ifdef _KERNEL 34#include <sys/cdefs.h> 35__FBSDID("$FreeBSD: head/sys/kern/subr_acl_nfs4.c 226043 2011-10-05 17:29:49Z trasz $"); 36 37#include <sys/param.h> 38#include <sys/systm.h> 39#include <sys/mount.h> 40#include <sys/priv.h> 41#include <sys/vnode.h> 42#include <sys/errno.h> 43#include <sys/stat.h> 44#include <sys/sysctl.h> 45#include <sys/acl.h> 46#else 47#include <errno.h> 48#include <assert.h> 49#include <sys/acl.h> 50#include <sys/stat.h> 51#define KASSERT(a, b) assert(a) 52#define CTASSERT(a) 53 54#endif /* !_KERNEL */ 55 56#ifdef _KERNEL 57 58static void acl_nfs4_trivial_from_mode(struct acl *aclp, mode_t mode); 59 60static int acl_nfs4_old_semantics = 0; 61 62SYSCTL_INT(_vfs, OID_AUTO, acl_nfs4_old_semantics, CTLFLAG_RW, 63 &acl_nfs4_old_semantics, 0, "Use pre-PSARC/2010/029 NFSv4 ACL semantics"); 64 65static struct { 66 accmode_t accmode; 67 int mask; 68} accmode2mask[] = {{VREAD, ACL_READ_DATA}, 69 {VWRITE, ACL_WRITE_DATA}, 70 {VAPPEND, ACL_APPEND_DATA}, 71 {VEXEC, ACL_EXECUTE}, 72 {VREAD_NAMED_ATTRS, ACL_READ_NAMED_ATTRS}, 73 {VWRITE_NAMED_ATTRS, ACL_WRITE_NAMED_ATTRS}, 74 {VDELETE_CHILD, ACL_DELETE_CHILD}, 75 {VREAD_ATTRIBUTES, ACL_READ_ATTRIBUTES}, 76 {VWRITE_ATTRIBUTES, ACL_WRITE_ATTRIBUTES}, 77 {VDELETE, ACL_DELETE}, 78 {VREAD_ACL, ACL_READ_ACL}, 79 {VWRITE_ACL, ACL_WRITE_ACL}, 80 {VWRITE_OWNER, ACL_WRITE_OWNER}, 81 {VSYNCHRONIZE, ACL_SYNCHRONIZE}, 82 {0, 0}}; 83 84static int 85_access_mask_from_accmode(accmode_t accmode) 86{ 87 int access_mask = 0, i; 88 89 for (i = 0; accmode2mask[i].accmode != 0; i++) { 90 if (accmode & accmode2mask[i].accmode) 91 access_mask |= accmode2mask[i].mask; 92 } 93 94 /* 95 * VAPPEND is just a modifier for VWRITE; if the caller asked 96 * for 'VAPPEND | VWRITE', we want to check for ACL_APPEND_DATA only. 97 */ 98 if (access_mask & ACL_APPEND_DATA) 99 access_mask &= ~ACL_WRITE_DATA; 100 101 return (access_mask); 102} 103 104/* 105 * Return 0, iff access is allowed, 1 otherwise. 106 */ 107static int 108_acl_denies(const struct acl *aclp, int access_mask, struct ucred *cred, 109 int file_uid, int file_gid, int *denied_explicitly) 110{ 111 int i; 112 const struct acl_entry *entry; 113 114 if (denied_explicitly != NULL) 115 *denied_explicitly = 0; 116 117 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 118 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 119 120 for (i = 0; i < aclp->acl_cnt; i++) { 121 entry = &(aclp->acl_entry[i]); 122 123 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 124 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 125 continue; 126 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 127 continue; 128 switch (entry->ae_tag) { 129 case ACL_USER_OBJ: 130 if (file_uid != cred->cr_uid) 131 continue; 132 break; 133 case ACL_USER: 134 if (entry->ae_id != cred->cr_uid) 135 continue; 136 break; 137 case ACL_GROUP_OBJ: 138 if (!groupmember(file_gid, cred)) 139 continue; 140 break; 141 case ACL_GROUP: 142 if (!groupmember(entry->ae_id, cred)) 143 continue; 144 break; 145 default: 146 KASSERT(entry->ae_tag == ACL_EVERYONE, 147 ("entry->ae_tag == ACL_EVERYONE")); 148 } 149 150 if (entry->ae_entry_type == ACL_ENTRY_TYPE_DENY) { 151 if (entry->ae_perm & access_mask) { 152 if (denied_explicitly != NULL) 153 *denied_explicitly = 1; 154 return (1); 155 } 156 } 157 158 access_mask &= ~(entry->ae_perm); 159 if (access_mask == 0) 160 return (0); 161 } 162 163 return (1); 164} 165 166int 167vaccess_acl_nfs4(enum vtype type, uid_t file_uid, gid_t file_gid, 168 struct acl *aclp, accmode_t accmode, struct ucred *cred, int *privused) 169{ 170 accmode_t priv_granted = 0; 171 int denied, explicitly_denied, access_mask, is_directory, 172 must_be_owner = 0; 173 mode_t file_mode = 0; 174 175 KASSERT((accmode & ~(VEXEC | VWRITE | VREAD | VADMIN | VAPPEND | 176 VEXPLICIT_DENY | VREAD_NAMED_ATTRS | VWRITE_NAMED_ATTRS | 177 VDELETE_CHILD | VREAD_ATTRIBUTES | VWRITE_ATTRIBUTES | VDELETE | 178 VREAD_ACL | VWRITE_ACL | VWRITE_OWNER | VSYNCHRONIZE)) == 0, 179 ("invalid bit in accmode")); 180 KASSERT((accmode & VAPPEND) == 0 || (accmode & VWRITE), 181 ("VAPPEND without VWRITE")); 182 183 if (privused != NULL) 184 *privused = 0; 185 186 if (accmode & VADMIN) 187 must_be_owner = 1; 188 189 /* 190 * Ignore VSYNCHRONIZE permission. 191 */ 192 accmode &= ~VSYNCHRONIZE; 193 194 access_mask = _access_mask_from_accmode(accmode); 195 196 if (type == VDIR) 197 is_directory = 1; 198 else 199 is_directory = 0; 200 201 /* 202 * File owner is always allowed to read and write the ACL 203 * and basic attributes. This is to prevent a situation 204 * where user would change ACL in a way that prevents him 205 * from undoing the change. 206 */ 207 if (file_uid == cred->cr_uid) 208 access_mask &= ~(ACL_READ_ACL | ACL_WRITE_ACL | 209 ACL_READ_ATTRIBUTES | ACL_WRITE_ATTRIBUTES); 210 211 /* 212 * Ignore append permission for regular files; use write 213 * permission instead. 214 */ 215 if (!is_directory && (access_mask & ACL_APPEND_DATA)) { 216 access_mask &= ~ACL_APPEND_DATA; 217 access_mask |= ACL_WRITE_DATA; 218 } 219 220 denied = _acl_denies(aclp, access_mask, cred, file_uid, file_gid, 221 &explicitly_denied); 222 223 if (must_be_owner) { 224 if (file_uid != cred->cr_uid) 225 denied = EPERM; 226 } 227 228 /* 229 * For VEXEC, ensure that at least one execute bit is set for 230 * non-directories. We have to check the mode here to stay 231 * consistent with execve(2). See the test in 232 * exec_check_permissions(). 233 */ 234 acl_nfs4_sync_mode_from_acl(&file_mode, aclp); 235 if (!denied && !is_directory && (accmode & VEXEC) && 236 (file_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0) 237 denied = EACCES; 238 239 if (!denied) 240 return (0); 241 242 /* 243 * Access failed. Iff it was not denied explicitly and 244 * VEXPLICIT_DENY flag was specified, allow access. 245 */ 246 if ((accmode & VEXPLICIT_DENY) && explicitly_denied == 0) 247 return (0); 248 249 accmode &= ~VEXPLICIT_DENY; 250 251 /* 252 * No match. Try to use privileges, if there are any. 253 */ 254 if (is_directory) { 255 if ((accmode & VEXEC) && !priv_check_cred(cred, 256 PRIV_VFS_LOOKUP, 0)) 257 priv_granted |= VEXEC; 258 } else { 259 /* 260 * Ensure that at least one execute bit is on. Otherwise, 261 * a privileged user will always succeed, and we don't want 262 * this to happen unless the file really is executable. 263 */ 264 if ((accmode & VEXEC) && (file_mode & 265 (S_IXUSR | S_IXGRP | S_IXOTH)) != 0 && 266 !priv_check_cred(cred, PRIV_VFS_EXEC, 0)) 267 priv_granted |= VEXEC; 268 } 269 270 if ((accmode & VREAD) && !priv_check_cred(cred, PRIV_VFS_READ, 0)) 271 priv_granted |= VREAD; 272 273 if ((accmode & (VWRITE | VAPPEND | VDELETE_CHILD)) && 274 !priv_check_cred(cred, PRIV_VFS_WRITE, 0)) 275 priv_granted |= (VWRITE | VAPPEND | VDELETE_CHILD); 276 277 if ((accmode & VADMIN_PERMS) && 278 !priv_check_cred(cred, PRIV_VFS_ADMIN, 0)) 279 priv_granted |= VADMIN_PERMS; 280 281 if ((accmode & VSTAT_PERMS) && 282 !priv_check_cred(cred, PRIV_VFS_STAT, 0)) 283 priv_granted |= VSTAT_PERMS; 284 285 if ((accmode & priv_granted) == accmode) { 286 if (privused != NULL) 287 *privused = 1; 288 289 return (0); 290 } 291 292 if (accmode & (VADMIN_PERMS | VDELETE_CHILD | VDELETE)) 293 denied = EPERM; 294 else 295 denied = EACCES; 296 297 return (denied); 298} 299#endif /* _KERNEL */ 300 301static int 302_acl_entry_matches(struct acl_entry *entry, acl_tag_t tag, acl_perm_t perm, 303 acl_entry_type_t entry_type) 304{ 305 if (entry->ae_tag != tag) 306 return (0); 307 308 if (entry->ae_id != ACL_UNDEFINED_ID) 309 return (0); 310 311 if (entry->ae_perm != perm) 312 return (0); 313 314 if (entry->ae_entry_type != entry_type) 315 return (0); 316 317 if (entry->ae_flags != 0) 318 return (0); 319 320 return (1); 321} 322 323static struct acl_entry * 324_acl_append(struct acl *aclp, acl_tag_t tag, acl_perm_t perm, 325 acl_entry_type_t entry_type) 326{ 327 struct acl_entry *entry; 328 329 KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 330 ("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 331 332 entry = &(aclp->acl_entry[aclp->acl_cnt]); 333 aclp->acl_cnt++; 334 335 entry->ae_tag = tag; 336 entry->ae_id = ACL_UNDEFINED_ID; 337 entry->ae_perm = perm; 338 entry->ae_entry_type = entry_type; 339 entry->ae_flags = 0; 340 341 return (entry); 342} 343 344static struct acl_entry * 345_acl_duplicate_entry(struct acl *aclp, int entry_index) 346{ 347 int i; 348 349 KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 350 ("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 351 352 for (i = aclp->acl_cnt; i > entry_index; i--) 353 aclp->acl_entry[i] = aclp->acl_entry[i - 1]; 354 355 aclp->acl_cnt++; 356 357 return (&(aclp->acl_entry[entry_index + 1])); 358} 359 360static void 361acl_nfs4_sync_acl_from_mode_draft(struct acl *aclp, mode_t mode, 362 int file_owner_id) 363{ 364 int i, meets, must_append; 365 struct acl_entry *entry, *copy, *previous, 366 *a1, *a2, *a3, *a4, *a5, *a6; 367 mode_t amode; 368 const int READ = 04; 369 const int WRITE = 02; 370 const int EXEC = 01; 371 372 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 373 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 374 375 /* 376 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 377 * 378 * 3.16.6.3. Applying a Mode to an Existing ACL 379 */ 380 381 /* 382 * 1. For each ACE: 383 */ 384 for (i = 0; i < aclp->acl_cnt; i++) { 385 entry = &(aclp->acl_entry[i]); 386 387 /* 388 * 1.1. If the type is neither ALLOW or DENY - skip. 389 */ 390 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 391 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 392 continue; 393 394 /* 395 * 1.2. If ACL_ENTRY_INHERIT_ONLY is set - skip. 396 */ 397 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 398 continue; 399 400 /* 401 * 1.3. If ACL_ENTRY_FILE_INHERIT or ACL_ENTRY_DIRECTORY_INHERIT 402 * are set: 403 */ 404 if (entry->ae_flags & 405 (ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT)) { 406 /* 407 * 1.3.1. A copy of the current ACE is made, and placed 408 * in the ACL immediately following the current 409 * ACE. 410 */ 411 copy = _acl_duplicate_entry(aclp, i); 412 413 /* 414 * 1.3.2. In the first ACE, the flag 415 * ACL_ENTRY_INHERIT_ONLY is set. 416 */ 417 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 418 419 /* 420 * 1.3.3. In the second ACE, the following flags 421 * are cleared: 422 * ACL_ENTRY_FILE_INHERIT, 423 * ACL_ENTRY_DIRECTORY_INHERIT, 424 * ACL_ENTRY_NO_PROPAGATE_INHERIT. 425 */ 426 copy->ae_flags &= ~(ACL_ENTRY_FILE_INHERIT | 427 ACL_ENTRY_DIRECTORY_INHERIT | 428 ACL_ENTRY_NO_PROPAGATE_INHERIT); 429 430 /* 431 * The algorithm continues on with the second ACE. 432 */ 433 i++; 434 entry = copy; 435 } 436 437 /* 438 * 1.4. If it's owner@, group@ or everyone@ entry, clear 439 * ACL_READ_DATA, ACL_WRITE_DATA, ACL_APPEND_DATA 440 * and ACL_EXECUTE. Continue to the next entry. 441 */ 442 if (entry->ae_tag == ACL_USER_OBJ || 443 entry->ae_tag == ACL_GROUP_OBJ || 444 entry->ae_tag == ACL_EVERYONE) { 445 entry->ae_perm &= ~(ACL_READ_DATA | ACL_WRITE_DATA | 446 ACL_APPEND_DATA | ACL_EXECUTE); 447 continue; 448 } 449 450 /* 451 * 1.5. Otherwise, if the "who" field did not match one 452 * of OWNER@, GROUP@, EVERYONE@: 453 * 454 * 1.5.1. If the type is ALLOW, check the preceding ACE. 455 * If it does not meet all of the following criteria: 456 */ 457 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW) 458 continue; 459 460 meets = 0; 461 if (i > 0) { 462 meets = 1; 463 previous = &(aclp->acl_entry[i - 1]); 464 465 /* 466 * 1.5.1.1. The type field is DENY, 467 */ 468 if (previous->ae_entry_type != ACL_ENTRY_TYPE_DENY) 469 meets = 0; 470 471 /* 472 * 1.5.1.2. The "who" field is the same as the current 473 * ACE, 474 * 475 * 1.5.1.3. The flag bit ACE4_IDENTIFIER_GROUP 476 * is the same as it is in the current ACE, 477 * and no other flag bits are set, 478 */ 479 if (previous->ae_id != entry->ae_id || 480 previous->ae_tag != entry->ae_tag) 481 meets = 0; 482 483 if (previous->ae_flags) 484 meets = 0; 485 486 /* 487 * 1.5.1.4. The mask bits are a subset of the mask bits 488 * of the current ACE, and are also subset of 489 * the following: ACL_READ_DATA, 490 * ACL_WRITE_DATA, ACL_APPEND_DATA, ACL_EXECUTE 491 */ 492 if (previous->ae_perm & ~(entry->ae_perm)) 493 meets = 0; 494 495 if (previous->ae_perm & ~(ACL_READ_DATA | 496 ACL_WRITE_DATA | ACL_APPEND_DATA | ACL_EXECUTE)) 497 meets = 0; 498 } 499 500 if (!meets) { 501 /* 502 * Then the ACE of type DENY, with a who equal 503 * to the current ACE, flag bits equal to 504 * (<current ACE flags> & <ACE_IDENTIFIER_GROUP>) 505 * and no mask bits, is prepended. 506 */ 507 previous = entry; 508 entry = _acl_duplicate_entry(aclp, i); 509 510 /* Adjust counter, as we've just added an entry. */ 511 i++; 512 513 previous->ae_tag = entry->ae_tag; 514 previous->ae_id = entry->ae_id; 515 previous->ae_flags = entry->ae_flags; 516 previous->ae_perm = 0; 517 previous->ae_entry_type = ACL_ENTRY_TYPE_DENY; 518 } 519 520 /* 521 * 1.5.2. The following modifications are made to the prepended 522 * ACE. The intent is to mask the following ACE 523 * to disallow ACL_READ_DATA, ACL_WRITE_DATA, 524 * ACL_APPEND_DATA, or ACL_EXECUTE, based upon the group 525 * permissions of the new mode. As a special case, 526 * if the ACE matches the current owner of the file, 527 * the owner bits are used, rather than the group bits. 528 * This is reflected in the algorithm below. 529 */ 530 amode = mode >> 3; 531 532 /* 533 * If ACE4_IDENTIFIER_GROUP is not set, and the "who" field 534 * in ACE matches the owner of the file, we shift amode three 535 * more bits, in order to have the owner permission bits 536 * placed in the three low order bits of amode. 537 */ 538 if (entry->ae_tag == ACL_USER && entry->ae_id == file_owner_id) 539 amode = amode >> 3; 540 541 if (entry->ae_perm & ACL_READ_DATA) { 542 if (amode & READ) 543 previous->ae_perm &= ~ACL_READ_DATA; 544 else 545 previous->ae_perm |= ACL_READ_DATA; 546 } 547 548 if (entry->ae_perm & ACL_WRITE_DATA) { 549 if (amode & WRITE) 550 previous->ae_perm &= ~ACL_WRITE_DATA; 551 else 552 previous->ae_perm |= ACL_WRITE_DATA; 553 } 554 555 if (entry->ae_perm & ACL_APPEND_DATA) { 556 if (amode & WRITE) 557 previous->ae_perm &= ~ACL_APPEND_DATA; 558 else 559 previous->ae_perm |= ACL_APPEND_DATA; 560 } 561 562 if (entry->ae_perm & ACL_EXECUTE) { 563 if (amode & EXEC) 564 previous->ae_perm &= ~ACL_EXECUTE; 565 else 566 previous->ae_perm |= ACL_EXECUTE; 567 } 568 569 /* 570 * 1.5.3. If ACE4_IDENTIFIER_GROUP is set in the flags 571 * of the ALLOW ace: 572 * 573 * XXX: This point is not there in the Falkner's draft. 574 */ 575 if (entry->ae_tag == ACL_GROUP && 576 entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) { 577 mode_t extramode, ownermode; 578 extramode = (mode >> 3) & 07; 579 ownermode = mode >> 6; 580 extramode &= ~ownermode; 581 582 if (extramode) { 583 if (extramode & READ) { 584 entry->ae_perm &= ~ACL_READ_DATA; 585 previous->ae_perm &= ~ACL_READ_DATA; 586 } 587 588 if (extramode & WRITE) { 589 entry->ae_perm &= 590 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 591 previous->ae_perm &= 592 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 593 } 594 595 if (extramode & EXEC) { 596 entry->ae_perm &= ~ACL_EXECUTE; 597 previous->ae_perm &= ~ACL_EXECUTE; 598 } 599 } 600 } 601 } 602 603 /* 604 * 2. If there at least six ACEs, the final six ACEs are examined. 605 * If they are not equal to what we want, append six ACEs. 606 */ 607 must_append = 0; 608 if (aclp->acl_cnt < 6) { 609 must_append = 1; 610 } else { 611 a6 = &(aclp->acl_entry[aclp->acl_cnt - 1]); 612 a5 = &(aclp->acl_entry[aclp->acl_cnt - 2]); 613 a4 = &(aclp->acl_entry[aclp->acl_cnt - 3]); 614 a3 = &(aclp->acl_entry[aclp->acl_cnt - 4]); 615 a2 = &(aclp->acl_entry[aclp->acl_cnt - 5]); 616 a1 = &(aclp->acl_entry[aclp->acl_cnt - 6]); 617 618 if (!_acl_entry_matches(a1, ACL_USER_OBJ, 0, 619 ACL_ENTRY_TYPE_DENY)) 620 must_append = 1; 621 if (!_acl_entry_matches(a2, ACL_USER_OBJ, ACL_WRITE_ACL | 622 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 623 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW)) 624 must_append = 1; 625 if (!_acl_entry_matches(a3, ACL_GROUP_OBJ, 0, 626 ACL_ENTRY_TYPE_DENY)) 627 must_append = 1; 628 if (!_acl_entry_matches(a4, ACL_GROUP_OBJ, 0, 629 ACL_ENTRY_TYPE_ALLOW)) 630 must_append = 1; 631 if (!_acl_entry_matches(a5, ACL_EVERYONE, ACL_WRITE_ACL | 632 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 633 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY)) 634 must_append = 1; 635 if (!_acl_entry_matches(a6, ACL_EVERYONE, ACL_READ_ACL | 636 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | 637 ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW)) 638 must_append = 1; 639 } 640 641 if (must_append) { 642 KASSERT(aclp->acl_cnt + 6 <= ACL_MAX_ENTRIES, 643 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 644 645 a1 = _acl_append(aclp, ACL_USER_OBJ, 0, ACL_ENTRY_TYPE_DENY); 646 a2 = _acl_append(aclp, ACL_USER_OBJ, ACL_WRITE_ACL | 647 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 648 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW); 649 a3 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_DENY); 650 a4 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_ALLOW); 651 a5 = _acl_append(aclp, ACL_EVERYONE, ACL_WRITE_ACL | 652 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 653 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY); 654 a6 = _acl_append(aclp, ACL_EVERYONE, ACL_READ_ACL | 655 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | 656 ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW); 657 658 KASSERT(a1 != NULL && a2 != NULL && a3 != NULL && a4 != NULL && 659 a5 != NULL && a6 != NULL, ("couldn't append to ACL.")); 660 } 661 662 /* 663 * 3. The final six ACEs are adjusted according to the incoming mode. 664 */ 665 if (mode & S_IRUSR) 666 a2->ae_perm |= ACL_READ_DATA; 667 else 668 a1->ae_perm |= ACL_READ_DATA; 669 if (mode & S_IWUSR) 670 a2->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 671 else 672 a1->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 673 if (mode & S_IXUSR) 674 a2->ae_perm |= ACL_EXECUTE; 675 else 676 a1->ae_perm |= ACL_EXECUTE; 677 678 if (mode & S_IRGRP) 679 a4->ae_perm |= ACL_READ_DATA; 680 else 681 a3->ae_perm |= ACL_READ_DATA; 682 if (mode & S_IWGRP) 683 a4->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 684 else 685 a3->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 686 if (mode & S_IXGRP) 687 a4->ae_perm |= ACL_EXECUTE; 688 else 689 a3->ae_perm |= ACL_EXECUTE; 690 691 if (mode & S_IROTH) 692 a6->ae_perm |= ACL_READ_DATA; 693 else 694 a5->ae_perm |= ACL_READ_DATA; 695 if (mode & S_IWOTH) 696 a6->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 697 else 698 a5->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 699 if (mode & S_IXOTH) 700 a6->ae_perm |= ACL_EXECUTE; 701 else 702 a5->ae_perm |= ACL_EXECUTE; 703} 704 705#ifdef _KERNEL 706void 707acl_nfs4_sync_acl_from_mode(struct acl *aclp, mode_t mode, 708 int file_owner_id) 709{ 710 711 if (acl_nfs4_old_semantics) 712 acl_nfs4_sync_acl_from_mode_draft(aclp, mode, file_owner_id); 713 else 714 acl_nfs4_trivial_from_mode(aclp, mode); 715} 716#endif /* _KERNEL */ 717 718void 719acl_nfs4_sync_mode_from_acl(mode_t *_mode, const struct acl *aclp) 720{ 721 int i; 722 mode_t old_mode = *_mode, mode = 0, seen = 0; 723 const struct acl_entry *entry; 724 725 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 726 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 727 728 /* 729 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 730 * 731 * 3.16.6.1. Recomputing mode upon SETATTR of ACL 732 */ 733 734 for (i = 0; i < aclp->acl_cnt; i++) { 735 entry = &(aclp->acl_entry[i]); 736 737 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 738 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 739 continue; 740 741 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 742 continue; 743 744 if (entry->ae_tag == ACL_USER_OBJ) { 745 if ((entry->ae_perm & ACL_READ_DATA) && 746 ((seen & S_IRUSR) == 0)) { 747 seen |= S_IRUSR; 748 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 749 mode |= S_IRUSR; 750 } 751 if ((entry->ae_perm & ACL_WRITE_DATA) && 752 ((seen & S_IWUSR) == 0)) { 753 seen |= S_IWUSR; 754 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 755 mode |= S_IWUSR; 756 } 757 if ((entry->ae_perm & ACL_EXECUTE) && 758 ((seen & S_IXUSR) == 0)) { 759 seen |= S_IXUSR; 760 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 761 mode |= S_IXUSR; 762 } 763 } else if (entry->ae_tag == ACL_GROUP_OBJ) { 764 if ((entry->ae_perm & ACL_READ_DATA) && 765 ((seen & S_IRGRP) == 0)) { 766 seen |= S_IRGRP; 767 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 768 mode |= S_IRGRP; 769 } 770 if ((entry->ae_perm & ACL_WRITE_DATA) && 771 ((seen & S_IWGRP) == 0)) { 772 seen |= S_IWGRP; 773 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 774 mode |= S_IWGRP; 775 } 776 if ((entry->ae_perm & ACL_EXECUTE) && 777 ((seen & S_IXGRP) == 0)) { 778 seen |= S_IXGRP; 779 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 780 mode |= S_IXGRP; 781 } 782 } else if (entry->ae_tag == ACL_EVERYONE) { 783 if (entry->ae_perm & ACL_READ_DATA) { 784 if ((seen & S_IRUSR) == 0) { 785 seen |= S_IRUSR; 786 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 787 mode |= S_IRUSR; 788 } 789 if ((seen & S_IRGRP) == 0) { 790 seen |= S_IRGRP; 791 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 792 mode |= S_IRGRP; 793 } 794 if ((seen & S_IROTH) == 0) { 795 seen |= S_IROTH; 796 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 797 mode |= S_IROTH; 798 } 799 } 800 if (entry->ae_perm & ACL_WRITE_DATA) { 801 if ((seen & S_IWUSR) == 0) { 802 seen |= S_IWUSR; 803 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 804 mode |= S_IWUSR; 805 } 806 if ((seen & S_IWGRP) == 0) { 807 seen |= S_IWGRP; 808 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 809 mode |= S_IWGRP; 810 } 811 if ((seen & S_IWOTH) == 0) { 812 seen |= S_IWOTH; 813 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 814 mode |= S_IWOTH; 815 } 816 } 817 if (entry->ae_perm & ACL_EXECUTE) { 818 if ((seen & S_IXUSR) == 0) { 819 seen |= S_IXUSR; 820 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 821 mode |= S_IXUSR; 822 } 823 if ((seen & S_IXGRP) == 0) { 824 seen |= S_IXGRP; 825 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 826 mode |= S_IXGRP; 827 } 828 if ((seen & S_IXOTH) == 0) { 829 seen |= S_IXOTH; 830 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 831 mode |= S_IXOTH; 832 } 833 } 834 } 835 } 836 837 *_mode = mode | (old_mode & ACL_PRESERVE_MASK); 838} 839 840#ifdef _KERNEL 841/* 842 * Calculate inherited ACL in a manner compatible with NFSv4 Minor Version 1, 843 * draft-ietf-nfsv4-minorversion1-03.txt. 844 */ 845static void 846acl_nfs4_compute_inherited_acl_draft(const struct acl *parent_aclp, 847 struct acl *child_aclp, mode_t mode, int file_owner_id, 848 int is_directory) 849{ 850 int i, flags; 851 const struct acl_entry *parent_entry; 852 struct acl_entry *entry, *copy; 853 854 KASSERT(child_aclp->acl_cnt == 0, ("child_aclp->acl_cnt == 0")); 855 KASSERT(parent_aclp->acl_cnt <= ACL_MAX_ENTRIES, 856 ("parent_aclp->acl_cnt <= ACL_MAX_ENTRIES")); 857 858 /* 859 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 860 * 861 * 3.16.6.2. Applying the mode given to CREATE or OPEN 862 * to an inherited ACL 863 */ 864 865 /* 866 * 1. Form an ACL that is the concatenation of all inheritable ACEs. 867 */ 868 for (i = 0; i < parent_aclp->acl_cnt; i++) { 869 parent_entry = &(parent_aclp->acl_entry[i]); 870 flags = parent_entry->ae_flags; 871 872 /* 873 * Entry is not inheritable at all. 874 */ 875 if ((flags & (ACL_ENTRY_DIRECTORY_INHERIT | 876 ACL_ENTRY_FILE_INHERIT)) == 0) 877 continue; 878 879 /* 880 * We're creating a file, but entry is not inheritable 881 * by files. 882 */ 883 if (!is_directory && (flags & ACL_ENTRY_FILE_INHERIT) == 0) 884 continue; 885 886 /* 887 * Entry is inheritable only by files, but has NO_PROPAGATE 888 * flag set, and we're creating a directory, so it wouldn't 889 * propagate to any file in that directory anyway. 890 */ 891 if (is_directory && 892 (flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0 && 893 (flags & ACL_ENTRY_NO_PROPAGATE_INHERIT)) 894 continue; 895 896 KASSERT(child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 897 ("child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 898 child_aclp->acl_entry[child_aclp->acl_cnt] = *parent_entry; 899 child_aclp->acl_cnt++; 900 } 901 902 /* 903 * 2. For each entry in the new ACL, adjust its flags, possibly 904 * creating two entries in place of one. 905 */ 906 for (i = 0; i < child_aclp->acl_cnt; i++) { 907 entry = &(child_aclp->acl_entry[i]); 908 909 /* 910 * This is not in the specification, but SunOS 911 * apparently does that. 912 */ 913 if (((entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT) || 914 !is_directory) && 915 entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 916 entry->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER); 917 918 /* 919 * 2.A. If the ACL_ENTRY_NO_PROPAGATE_INHERIT is set, or if the object 920 * being created is not a directory, then clear the 921 * following flags: ACL_ENTRY_NO_PROPAGATE_INHERIT, 922 * ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT, 923 * ACL_ENTRY_INHERIT_ONLY. 924 */ 925 if (entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT || 926 !is_directory) { 927 entry->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 928 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 929 ACL_ENTRY_INHERIT_ONLY); 930 931 /* 932 * Continue on to the next ACE. 933 */ 934 continue; 935 } 936 937 /* 938 * 2.B. If the object is a directory and ACL_ENTRY_FILE_INHERIT 939 * is set, but ACL_ENTRY_NO_PROPAGATE_INHERIT is not set, ensure 940 * that ACL_ENTRY_INHERIT_ONLY is set. Continue to the 941 * next ACE. Otherwise... 942 */ 943 /* 944 * XXX: Read it again and make sure what does the "otherwise" 945 * apply to. 946 */ 947 if (is_directory && 948 (entry->ae_flags & ACL_ENTRY_FILE_INHERIT) && 949 ((entry->ae_flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0)) { 950 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 951 continue; 952 } 953 954 /* 955 * 2.C. If the type of the ACE is neither ALLOW nor deny, 956 * then continue. 957 */ 958 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 959 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 960 continue; 961 962 /* 963 * 2.D. Copy the original ACE into a second, adjacent ACE. 964 */ 965 copy = _acl_duplicate_entry(child_aclp, i); 966 967 /* 968 * 2.E. On the first ACE, ensure that ACL_ENTRY_INHERIT_ONLY 969 * is set. 970 */ 971 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 972 973 /* 974 * 2.F. On the second ACE, clear the following flags: 975 * ACL_ENTRY_NO_PROPAGATE_INHERIT, ACL_ENTRY_FILE_INHERIT, 976 * ACL_ENTRY_DIRECTORY_INHERIT, ACL_ENTRY_INHERIT_ONLY. 977 */ 978 copy->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 979 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 980 ACL_ENTRY_INHERIT_ONLY); 981 982 /* 983 * 2.G. On the second ACE, if the type is ALLOW, 984 * an implementation MAY clear the following 985 * mask bits: ACL_WRITE_ACL, ACL_WRITE_OWNER. 986 */ 987 if (copy->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 988 copy->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER); 989 990 /* 991 * Increment the counter to skip the copied entry. 992 */ 993 i++; 994 } 995 996 /* 997 * 3. To ensure that the mode is honored, apply the algorithm describe 998 * in Section 2.16.6.3, using the mode that is to be used for file 999 * creation. 1000 */ 1001 acl_nfs4_sync_acl_from_mode(child_aclp, mode, file_owner_id); 1002} 1003#endif /* _KERNEL */ 1004 1005/* 1006 * Populate the ACL with entries inherited from parent_aclp. 1007 */ 1008static void 1009acl_nfs4_inherit_entries(const struct acl *parent_aclp, 1010 struct acl *child_aclp, mode_t mode, int file_owner_id, 1011 int is_directory) 1012{ 1013 int i, flags, tag; 1014 const struct acl_entry *parent_entry; 1015 struct acl_entry *entry; 1016 1017 KASSERT(parent_aclp->acl_cnt <= ACL_MAX_ENTRIES, 1018 ("parent_aclp->acl_cnt <= ACL_MAX_ENTRIES")); 1019 1020 for (i = 0; i < parent_aclp->acl_cnt; i++) { 1021 parent_entry = &(parent_aclp->acl_entry[i]); 1022 flags = parent_entry->ae_flags; 1023 tag = parent_entry->ae_tag; 1024 1025 /* 1026 * Don't inherit owner@, group@, or everyone@ entries. 1027 */ 1028 if (tag == ACL_USER_OBJ || tag == ACL_GROUP_OBJ || 1029 tag == ACL_EVERYONE) 1030 continue; 1031 1032 /* 1033 * Entry is not inheritable at all. 1034 */ 1035 if ((flags & (ACL_ENTRY_DIRECTORY_INHERIT | 1036 ACL_ENTRY_FILE_INHERIT)) == 0) 1037 continue; 1038 1039 /* 1040 * We're creating a file, but entry is not inheritable 1041 * by files. 1042 */ 1043 if (!is_directory && (flags & ACL_ENTRY_FILE_INHERIT) == 0) 1044 continue; 1045 1046 /* 1047 * Entry is inheritable only by files, but has NO_PROPAGATE 1048 * flag set, and we're creating a directory, so it wouldn't 1049 * propagate to any file in that directory anyway. 1050 */ 1051 if (is_directory && 1052 (flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0 && 1053 (flags & ACL_ENTRY_NO_PROPAGATE_INHERIT)) 1054 continue; 1055 1056 /* 1057 * Entry qualifies for being inherited. 1058 */ 1059 KASSERT(child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 1060 ("child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 1061 entry = &(child_aclp->acl_entry[child_aclp->acl_cnt]); 1062 *entry = *parent_entry; 1063 child_aclp->acl_cnt++; 1064 1065 entry->ae_flags &= ~ACL_ENTRY_INHERIT_ONLY; 1066 1067 /* 1068 * If the type of the ACE is neither ALLOW nor DENY, 1069 * then leave it as it is and proceed to the next one. 1070 */ 1071 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 1072 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 1073 continue; 1074 1075 /* 1076 * If the ACL_ENTRY_NO_PROPAGATE_INHERIT is set, or if 1077 * the object being created is not a directory, then clear 1078 * the following flags: ACL_ENTRY_NO_PROPAGATE_INHERIT, 1079 * ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT, 1080 * ACL_ENTRY_INHERIT_ONLY. 1081 */ 1082 if (entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT || 1083 !is_directory) { 1084 entry->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 1085 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 1086 ACL_ENTRY_INHERIT_ONLY); 1087 } 1088 1089 /* 1090 * If the object is a directory and ACL_ENTRY_FILE_INHERIT 1091 * is set, but ACL_ENTRY_DIRECTORY_INHERIT is not set, ensure 1092 * that ACL_ENTRY_INHERIT_ONLY is set. 1093 */ 1094 if (is_directory && 1095 (entry->ae_flags & ACL_ENTRY_FILE_INHERIT) && 1096 ((entry->ae_flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0)) { 1097 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 1098 } 1099 1100 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW && 1101 (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) == 0) { 1102 /* 1103 * Some permissions must never be inherited. 1104 */ 1105 entry->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER | 1106 ACL_WRITE_NAMED_ATTRS | ACL_WRITE_ATTRIBUTES); 1107 1108 /* 1109 * Others must be masked according to the file mode. 1110 */ 1111 if ((mode & S_IRGRP) == 0) 1112 entry->ae_perm &= ~ACL_READ_DATA; 1113 if ((mode & S_IWGRP) == 0) 1114 entry->ae_perm &= 1115 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 1116 if ((mode & S_IXGRP) == 0) 1117 entry->ae_perm &= ~ACL_EXECUTE; 1118 } 1119 } 1120} 1121 1122/* 1123 * Calculate inherited ACL in a manner compatible with PSARC/2010/029. 1124 * It's also being used to calculate a trivial ACL, by inheriting from 1125 * a NULL ACL. 1126 */ 1127static void 1128acl_nfs4_compute_inherited_acl_psarc(const struct acl *parent_aclp, 1129 struct acl *aclp, mode_t mode, int file_owner_id, int is_directory) 1130{ 1131 acl_perm_t user_allow_first = 0, user_deny = 0, group_deny = 0; 1132 acl_perm_t user_allow, group_allow, everyone_allow; 1133 1134 KASSERT(aclp->acl_cnt == 0, ("aclp->acl_cnt == 0")); 1135 1136 user_allow = group_allow = everyone_allow = ACL_READ_ACL | 1137 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | ACL_SYNCHRONIZE; 1138 user_allow |= ACL_WRITE_ACL | ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 1139 ACL_WRITE_NAMED_ATTRS; 1140 1141 if (mode & S_IRUSR) 1142 user_allow |= ACL_READ_DATA; 1143 if (mode & S_IWUSR) 1144 user_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 1145 if (mode & S_IXUSR) 1146 user_allow |= ACL_EXECUTE; 1147 1148 if (mode & S_IRGRP) 1149 group_allow |= ACL_READ_DATA; 1150 if (mode & S_IWGRP) 1151 group_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 1152 if (mode & S_IXGRP) 1153 group_allow |= ACL_EXECUTE; 1154 1155 if (mode & S_IROTH) 1156 everyone_allow |= ACL_READ_DATA; 1157 if (mode & S_IWOTH) 1158 everyone_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 1159 if (mode & S_IXOTH) 1160 everyone_allow |= ACL_EXECUTE; 1161 1162 user_deny = ((group_allow | everyone_allow) & ~user_allow); 1163 group_deny = everyone_allow & ~group_allow; 1164 user_allow_first = group_deny & ~user_deny; 1165 1166 if (user_allow_first != 0) 1167 _acl_append(aclp, ACL_USER_OBJ, user_allow_first, 1168 ACL_ENTRY_TYPE_ALLOW); 1169 if (user_deny != 0) 1170 _acl_append(aclp, ACL_USER_OBJ, user_deny, 1171 ACL_ENTRY_TYPE_DENY); 1172 if (group_deny != 0) 1173 _acl_append(aclp, ACL_GROUP_OBJ, group_deny, 1174 ACL_ENTRY_TYPE_DENY); 1175 1176 if (parent_aclp != NULL) 1177 acl_nfs4_inherit_entries(parent_aclp, aclp, mode, 1178 file_owner_id, is_directory); 1179 1180 _acl_append(aclp, ACL_USER_OBJ, user_allow, ACL_ENTRY_TYPE_ALLOW); 1181 _acl_append(aclp, ACL_GROUP_OBJ, group_allow, ACL_ENTRY_TYPE_ALLOW); 1182 _acl_append(aclp, ACL_EVERYONE, everyone_allow, ACL_ENTRY_TYPE_ALLOW); 1183} 1184 1185#ifdef _KERNEL 1186void 1187acl_nfs4_compute_inherited_acl(const struct acl *parent_aclp, 1188 struct acl *child_aclp, mode_t mode, int file_owner_id, 1189 int is_directory) 1190{ 1191 1192 if (acl_nfs4_old_semantics) 1193 acl_nfs4_compute_inherited_acl_draft(parent_aclp, child_aclp, 1194 mode, file_owner_id, is_directory); 1195 else 1196 acl_nfs4_compute_inherited_acl_psarc(parent_aclp, child_aclp, 1197 mode, file_owner_id, is_directory); 1198} 1199#endif /* _KERNEL */ 1200 1201/* 1202 * Calculate trivial ACL in a manner compatible with PSARC/2010/029. 1203 * Note that this results in an ACL different from (but semantically 1204 * equal to) the "canonical six" trivial ACL computed using algorithm 1205 * described in draft-ietf-nfsv4-minorversion1-03.txt, 3.16.6.2. 1206 */ 1207static void 1208acl_nfs4_trivial_from_mode(struct acl *aclp, mode_t mode) 1209{ 1210 1211 aclp->acl_cnt = 0; 1212 acl_nfs4_compute_inherited_acl_psarc(NULL, aclp, mode, -1, -1); 1213} 1214 1215#ifndef _KERNEL 1216/* 1217 * This routine is used by libc to implement acl_strip_np(3) 1218 * and acl_is_trivial_np(3). 1219 */ 1220void 1221acl_nfs4_trivial_from_mode_libc(struct acl *aclp, int mode, int canonical_six) 1222{ 1223 1224 aclp->acl_cnt = 0; 1225 if (canonical_six) 1226 acl_nfs4_sync_acl_from_mode_draft(aclp, mode, -1); 1227 else 1228 acl_nfs4_trivial_from_mode(aclp, mode); 1229} 1230#endif /* !_KERNEL */ 1231 1232#ifdef _KERNEL 1233static int 1234_acls_are_equal(const struct acl *a, const struct acl *b) 1235{ 1236 int i; 1237 const struct acl_entry *entrya, *entryb; 1238 1239 if (a->acl_cnt != b->acl_cnt) 1240 return (0); 1241 1242 for (i = 0; i < b->acl_cnt; i++) { 1243 entrya = &(a->acl_entry[i]); 1244 entryb = &(b->acl_entry[i]); 1245 1246 if (entrya->ae_tag != entryb->ae_tag || 1247 entrya->ae_id != entryb->ae_id || 1248 entrya->ae_perm != entryb->ae_perm || 1249 entrya->ae_entry_type != entryb->ae_entry_type || 1250 entrya->ae_flags != entryb->ae_flags) 1251 return (0); 1252 } 1253 1254 return (1); 1255} 1256 1257/* 1258 * This routine is used to determine whether to remove extended attribute 1259 * that stores ACL contents. 1260 */ 1261int 1262acl_nfs4_is_trivial(const struct acl *aclp, int file_owner_id) 1263{ 1264 int trivial; 1265 mode_t tmpmode = 0; 1266 struct acl *tmpaclp; 1267 1268 if (aclp->acl_cnt > 6) 1269 return (0); 1270 1271 /* 1272 * Compute the mode from the ACL, then compute new ACL from that mode. 1273 * If the ACLs are identical, then the ACL is trivial. 1274 * 1275 * XXX: I guess there is a faster way to do this. However, even 1276 * this slow implementation significantly speeds things up 1277 * for files that don't have non-trivial ACLs - it's critical 1278 * for performance to not use EA when they are not needed. 1279 * 1280 * First try the PSARC/2010/029 semantics. 1281 */ 1282 tmpaclp = acl_alloc(M_WAITOK | M_ZERO); 1283 acl_nfs4_sync_mode_from_acl(&tmpmode, aclp); 1284 acl_nfs4_trivial_from_mode(tmpaclp, tmpmode); 1285 trivial = _acls_are_equal(aclp, tmpaclp); 1286 if (trivial) { 1287 acl_free(tmpaclp); 1288 return (trivial); 1289 } 1290 1291 /* 1292 * Check if it's a draft-ietf-nfsv4-minorversion1-03.txt trivial ACL. 1293 */ 1294 tmpaclp->acl_cnt = 0; 1295 acl_nfs4_sync_acl_from_mode_draft(tmpaclp, tmpmode, file_owner_id); 1296 trivial = _acls_are_equal(aclp, tmpaclp); 1297 acl_free(tmpaclp); 1298 1299 return (trivial); 1300} 1301#endif /* _KERNEL */ 1302 1303int 1304acl_nfs4_check(const struct acl *aclp, int is_directory) 1305{ 1306 int i; 1307 const struct acl_entry *entry; 1308 1309 /* 1310 * The spec doesn't seem to say anything about ACL validity. 1311 * It seems there is not much to do here. There is even no need 1312 * to count "owner@" or "everyone@" (ACL_USER_OBJ and ACL_EVERYONE) 1313 * entries, as there can be several of them and that's perfectly 1314 * valid. There can be none of them too. Really. 1315 */ 1316 1317 if (aclp->acl_cnt > ACL_MAX_ENTRIES || aclp->acl_cnt <= 0) 1318 return (EINVAL); 1319 1320 for (i = 0; i < aclp->acl_cnt; i++) { 1321 entry = &(aclp->acl_entry[i]); 1322 1323 switch (entry->ae_tag) { 1324 case ACL_USER_OBJ: 1325 case ACL_GROUP_OBJ: 1326 case ACL_EVERYONE: 1327 if (entry->ae_id != ACL_UNDEFINED_ID) 1328 return (EINVAL); 1329 break; 1330 1331 case ACL_USER: 1332 case ACL_GROUP: 1333 if (entry->ae_id == ACL_UNDEFINED_ID) 1334 return (EINVAL); 1335 break; 1336 1337 default: 1338 return (EINVAL); 1339 } 1340 1341 if ((entry->ae_perm | ACL_NFS4_PERM_BITS) != ACL_NFS4_PERM_BITS) 1342 return (EINVAL); 1343 1344 /* 1345 * Disallow ACL_ENTRY_TYPE_AUDIT and ACL_ENTRY_TYPE_ALARM for now. 1346 */ 1347 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 1348 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 1349 return (EINVAL); 1350 1351 if ((entry->ae_flags | ACL_FLAGS_BITS) != ACL_FLAGS_BITS) 1352 return (EINVAL); 1353 1354 /* Disallow unimplemented flags. */ 1355 if (entry->ae_flags & (ACL_ENTRY_SUCCESSFUL_ACCESS | 1356 ACL_ENTRY_FAILED_ACCESS)) 1357 return (EINVAL); 1358 1359 /* Disallow flags not allowed for ordinary files. */ 1360 if (!is_directory) { 1361 if (entry->ae_flags & (ACL_ENTRY_FILE_INHERIT | 1362 ACL_ENTRY_DIRECTORY_INHERIT | 1363 ACL_ENTRY_NO_PROPAGATE_INHERIT | ACL_ENTRY_INHERIT_ONLY)) 1364 return (EINVAL); 1365 } 1366 } 1367 1368 return (0); 1369} 1370