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FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_acl_nfs4.c
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2008-2010 Edward Tomasz Napierała <trasz@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 /* 30 * ACL support routines specific to NFSv4 access control lists. These are 31 * utility routines for code common across file systems implementing NFSv4 32 * ACLs. 33 */ 34 35 #ifdef _KERNEL 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include <sys/param.h> 40 #include <sys/kernel.h> 41 #include <sys/module.h> 42 #include <sys/systm.h> 43 #include <sys/mount.h> 44 #include <sys/priv.h> 45 #include <sys/vnode.h> 46 #include <sys/errno.h> 47 #include <sys/stat.h> 48 #include <sys/sysctl.h> 49 #include <sys/acl.h> 50 #else 51 #include <errno.h> 52 #include <assert.h> 53 #include <sys/acl.h> 54 #include <sys/stat.h> 55 #define KASSERT(a, b) assert(a) 56 #define CTASSERT(a) 57 58 #endif /* !_KERNEL */ 59 60 #ifdef _KERNEL 61 62 static void acl_nfs4_trivial_from_mode(struct acl *aclp, mode_t mode); 63 64 static int acl_nfs4_old_semantics = 0; 65 66 SYSCTL_INT(_vfs, OID_AUTO, acl_nfs4_old_semantics, CTLFLAG_RW, 67 &acl_nfs4_old_semantics, 0, "Use pre-PSARC/2010/029 NFSv4 ACL semantics"); 68 69 static struct { 70 accmode_t accmode; 71 int mask; 72 } accmode2mask[] = {{VREAD, ACL_READ_DATA}, 73 {VWRITE, ACL_WRITE_DATA}, 74 {VAPPEND, ACL_APPEND_DATA}, 75 {VEXEC, ACL_EXECUTE}, 76 {VREAD_NAMED_ATTRS, ACL_READ_NAMED_ATTRS}, 77 {VWRITE_NAMED_ATTRS, ACL_WRITE_NAMED_ATTRS}, 78 {VDELETE_CHILD, ACL_DELETE_CHILD}, 79 {VREAD_ATTRIBUTES, ACL_READ_ATTRIBUTES}, 80 {VWRITE_ATTRIBUTES, ACL_WRITE_ATTRIBUTES}, 81 {VDELETE, ACL_DELETE}, 82 {VREAD_ACL, ACL_READ_ACL}, 83 {VWRITE_ACL, ACL_WRITE_ACL}, 84 {VWRITE_OWNER, ACL_WRITE_OWNER}, 85 {VSYNCHRONIZE, ACL_SYNCHRONIZE}, 86 {0, 0}}; 87 88 static int 89 _access_mask_from_accmode(accmode_t accmode) 90 { 91 int access_mask = 0, i; 92 93 for (i = 0; accmode2mask[i].accmode != 0; i++) { 94 if (accmode & accmode2mask[i].accmode) 95 access_mask |= accmode2mask[i].mask; 96 } 97 98 /* 99 * VAPPEND is just a modifier for VWRITE; if the caller asked 100 * for 'VAPPEND | VWRITE', we want to check for ACL_APPEND_DATA only. 101 */ 102 if (access_mask & ACL_APPEND_DATA) 103 access_mask &= ~ACL_WRITE_DATA; 104 105 return (access_mask); 106 } 107 108 /* 109 * Return 0, iff access is allowed, 1 otherwise. 110 */ 111 static int 112 _acl_denies(const struct acl *aclp, int access_mask, struct ucred *cred, 113 int file_uid, int file_gid, int *denied_explicitly) 114 { 115 int i; 116 const struct acl_entry *entry; 117 118 if (denied_explicitly != NULL) 119 *denied_explicitly = 0; 120 121 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 122 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 123 124 for (i = 0; i < aclp->acl_cnt; i++) { 125 entry = &(aclp->acl_entry[i]); 126 127 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 128 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 129 continue; 130 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 131 continue; 132 switch (entry->ae_tag) { 133 case ACL_USER_OBJ: 134 if (file_uid != cred->cr_uid) 135 continue; 136 break; 137 case ACL_USER: 138 if (entry->ae_id != cred->cr_uid) 139 continue; 140 break; 141 case ACL_GROUP_OBJ: 142 if (!groupmember(file_gid, cred)) 143 continue; 144 break; 145 case ACL_GROUP: 146 if (!groupmember(entry->ae_id, cred)) 147 continue; 148 break; 149 default: 150 KASSERT(entry->ae_tag == ACL_EVERYONE, 151 ("entry->ae_tag == ACL_EVERYONE")); 152 } 153 154 if (entry->ae_entry_type == ACL_ENTRY_TYPE_DENY) { 155 if (entry->ae_perm & access_mask) { 156 if (denied_explicitly != NULL) 157 *denied_explicitly = 1; 158 return (1); 159 } 160 } 161 162 access_mask &= ~(entry->ae_perm); 163 if (access_mask == 0) 164 return (0); 165 } 166 167 if (access_mask == 0) 168 return (0); 169 170 return (1); 171 } 172 173 int 174 vaccess_acl_nfs4(enum vtype type, uid_t file_uid, gid_t file_gid, 175 struct acl *aclp, accmode_t accmode, struct ucred *cred, int *privused) 176 { 177 accmode_t priv_granted = 0; 178 int denied, explicitly_denied, access_mask, is_directory, 179 must_be_owner = 0; 180 mode_t file_mode = 0; 181 182 KASSERT((accmode & ~(VEXEC | VWRITE | VREAD | VADMIN | VAPPEND | 183 VEXPLICIT_DENY | VREAD_NAMED_ATTRS | VWRITE_NAMED_ATTRS | 184 VDELETE_CHILD | VREAD_ATTRIBUTES | VWRITE_ATTRIBUTES | VDELETE | 185 VREAD_ACL | VWRITE_ACL | VWRITE_OWNER | VSYNCHRONIZE)) == 0, 186 ("invalid bit in accmode")); 187 KASSERT((accmode & VAPPEND) == 0 || (accmode & VWRITE), 188 ("VAPPEND without VWRITE")); 189 190 if (privused != NULL) 191 *privused = 0; 192 193 if (accmode & VADMIN) 194 must_be_owner = 1; 195 196 /* 197 * Ignore VSYNCHRONIZE permission. 198 */ 199 accmode &= ~VSYNCHRONIZE; 200 201 access_mask = _access_mask_from_accmode(accmode); 202 203 if (type == VDIR) 204 is_directory = 1; 205 else 206 is_directory = 0; 207 208 /* 209 * File owner is always allowed to read and write the ACL 210 * and basic attributes. This is to prevent a situation 211 * where user would change ACL in a way that prevents him 212 * from undoing the change. 213 */ 214 if (file_uid == cred->cr_uid) 215 access_mask &= ~(ACL_READ_ACL | ACL_WRITE_ACL | 216 ACL_READ_ATTRIBUTES | ACL_WRITE_ATTRIBUTES); 217 218 /* 219 * Ignore append permission for regular files; use write 220 * permission instead. 221 */ 222 if (!is_directory && (access_mask & ACL_APPEND_DATA)) { 223 access_mask &= ~ACL_APPEND_DATA; 224 access_mask |= ACL_WRITE_DATA; 225 } 226 227 denied = _acl_denies(aclp, access_mask, cred, file_uid, file_gid, 228 &explicitly_denied); 229 230 if (must_be_owner) { 231 if (file_uid != cred->cr_uid) 232 denied = EPERM; 233 } 234 235 /* 236 * For VEXEC, ensure that at least one execute bit is set for 237 * non-directories. We have to check the mode here to stay 238 * consistent with execve(2). See the test in 239 * exec_check_permissions(). 240 */ 241 acl_nfs4_sync_mode_from_acl(&file_mode, aclp); 242 if (!denied && !is_directory && (accmode & VEXEC) && 243 (file_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0) 244 denied = EACCES; 245 246 if (!denied) 247 return (0); 248 249 /* 250 * Access failed. Iff it was not denied explicitly and 251 * VEXPLICIT_DENY flag was specified, allow access. 252 */ 253 if ((accmode & VEXPLICIT_DENY) && explicitly_denied == 0) 254 return (0); 255 256 accmode &= ~VEXPLICIT_DENY; 257 258 /* 259 * No match. Try to use privileges, if there are any. 260 */ 261 if (is_directory) { 262 if ((accmode & VEXEC) && !priv_check_cred(cred, 263 PRIV_VFS_LOOKUP, 0)) 264 priv_granted |= VEXEC; 265 } else { 266 /* 267 * Ensure that at least one execute bit is on. Otherwise, 268 * a privileged user will always succeed, and we don't want 269 * this to happen unless the file really is executable. 270 */ 271 if ((accmode & VEXEC) && (file_mode & 272 (S_IXUSR | S_IXGRP | S_IXOTH)) != 0 && 273 !priv_check_cred(cred, PRIV_VFS_EXEC, 0)) 274 priv_granted |= VEXEC; 275 } 276 277 if ((accmode & VREAD) && !priv_check_cred(cred, PRIV_VFS_READ, 0)) 278 priv_granted |= VREAD; 279 280 if ((accmode & (VWRITE | VAPPEND | VDELETE_CHILD)) && 281 !priv_check_cred(cred, PRIV_VFS_WRITE, 0)) 282 priv_granted |= (VWRITE | VAPPEND | VDELETE_CHILD); 283 284 if ((accmode & VADMIN_PERMS) && 285 !priv_check_cred(cred, PRIV_VFS_ADMIN, 0)) 286 priv_granted |= VADMIN_PERMS; 287 288 if ((accmode & VSTAT_PERMS) && 289 !priv_check_cred(cred, PRIV_VFS_STAT, 0)) 290 priv_granted |= VSTAT_PERMS; 291 292 if ((accmode & priv_granted) == accmode) { 293 if (privused != NULL) 294 *privused = 1; 295 296 return (0); 297 } 298 299 if (accmode & (VADMIN_PERMS | VDELETE_CHILD | VDELETE)) 300 denied = EPERM; 301 else 302 denied = EACCES; 303 304 return (denied); 305 } 306 #endif /* _KERNEL */ 307 308 static int 309 _acl_entry_matches(struct acl_entry *entry, acl_tag_t tag, acl_perm_t perm, 310 acl_entry_type_t entry_type) 311 { 312 if (entry->ae_tag != tag) 313 return (0); 314 315 if (entry->ae_id != ACL_UNDEFINED_ID) 316 return (0); 317 318 if (entry->ae_perm != perm) 319 return (0); 320 321 if (entry->ae_entry_type != entry_type) 322 return (0); 323 324 if (entry->ae_flags != 0) 325 return (0); 326 327 return (1); 328 } 329 330 static struct acl_entry * 331 _acl_append(struct acl *aclp, acl_tag_t tag, acl_perm_t perm, 332 acl_entry_type_t entry_type) 333 { 334 struct acl_entry *entry; 335 336 KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 337 ("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 338 339 entry = &(aclp->acl_entry[aclp->acl_cnt]); 340 aclp->acl_cnt++; 341 342 entry->ae_tag = tag; 343 entry->ae_id = ACL_UNDEFINED_ID; 344 entry->ae_perm = perm; 345 entry->ae_entry_type = entry_type; 346 entry->ae_flags = 0; 347 348 return (entry); 349 } 350 351 static struct acl_entry * 352 _acl_duplicate_entry(struct acl *aclp, unsigned entry_index) 353 { 354 unsigned i; 355 356 KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 357 ("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 358 359 for (i = aclp->acl_cnt; i > entry_index; i--) 360 aclp->acl_entry[i] = aclp->acl_entry[i - 1]; 361 362 aclp->acl_cnt++; 363 364 return (&(aclp->acl_entry[entry_index + 1])); 365 } 366 367 static void 368 acl_nfs4_sync_acl_from_mode_draft(struct acl *aclp, mode_t mode, 369 int file_owner_id) 370 { 371 int meets, must_append; 372 unsigned i; 373 struct acl_entry *entry, *copy, *previous, 374 *a1, *a2, *a3, *a4, *a5, *a6; 375 mode_t amode; 376 const int READ = 04; 377 const int WRITE = 02; 378 const int EXEC = 01; 379 380 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 381 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 382 383 /* 384 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 385 * 386 * 3.16.6.3. Applying a Mode to an Existing ACL 387 */ 388 389 /* 390 * 1. For each ACE: 391 */ 392 for (i = 0; i < aclp->acl_cnt; i++) { 393 entry = &(aclp->acl_entry[i]); 394 395 /* 396 * 1.1. If the type is neither ALLOW or DENY - skip. 397 */ 398 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 399 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 400 continue; 401 402 /* 403 * 1.2. If ACL_ENTRY_INHERIT_ONLY is set - skip. 404 */ 405 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 406 continue; 407 408 /* 409 * 1.3. If ACL_ENTRY_FILE_INHERIT or ACL_ENTRY_DIRECTORY_INHERIT 410 * are set: 411 */ 412 if (entry->ae_flags & 413 (ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT)) { 414 /* 415 * 1.3.1. A copy of the current ACE is made, and placed 416 * in the ACL immediately following the current 417 * ACE. 418 */ 419 copy = _acl_duplicate_entry(aclp, i); 420 421 /* 422 * 1.3.2. In the first ACE, the flag 423 * ACL_ENTRY_INHERIT_ONLY is set. 424 */ 425 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 426 427 /* 428 * 1.3.3. In the second ACE, the following flags 429 * are cleared: 430 * ACL_ENTRY_FILE_INHERIT, 431 * ACL_ENTRY_DIRECTORY_INHERIT, 432 * ACL_ENTRY_NO_PROPAGATE_INHERIT. 433 */ 434 copy->ae_flags &= ~(ACL_ENTRY_FILE_INHERIT | 435 ACL_ENTRY_DIRECTORY_INHERIT | 436 ACL_ENTRY_NO_PROPAGATE_INHERIT); 437 438 /* 439 * The algorithm continues on with the second ACE. 440 */ 441 i++; 442 entry = copy; 443 } 444 445 /* 446 * 1.4. If it's owner@, group@ or everyone@ entry, clear 447 * ACL_READ_DATA, ACL_WRITE_DATA, ACL_APPEND_DATA 448 * and ACL_EXECUTE. Continue to the next entry. 449 */ 450 if (entry->ae_tag == ACL_USER_OBJ || 451 entry->ae_tag == ACL_GROUP_OBJ || 452 entry->ae_tag == ACL_EVERYONE) { 453 entry->ae_perm &= ~(ACL_READ_DATA | ACL_WRITE_DATA | 454 ACL_APPEND_DATA | ACL_EXECUTE); 455 continue; 456 } 457 458 /* 459 * 1.5. Otherwise, if the "who" field did not match one 460 * of OWNER@, GROUP@, EVERYONE@: 461 * 462 * 1.5.1. If the type is ALLOW, check the preceding ACE. 463 * If it does not meet all of the following criteria: 464 */ 465 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW) 466 continue; 467 468 meets = 0; 469 if (i > 0) { 470 meets = 1; 471 previous = &(aclp->acl_entry[i - 1]); 472 473 /* 474 * 1.5.1.1. The type field is DENY, 475 */ 476 if (previous->ae_entry_type != ACL_ENTRY_TYPE_DENY) 477 meets = 0; 478 479 /* 480 * 1.5.1.2. The "who" field is the same as the current 481 * ACE, 482 * 483 * 1.5.1.3. The flag bit ACE4_IDENTIFIER_GROUP 484 * is the same as it is in the current ACE, 485 * and no other flag bits are set, 486 */ 487 if (previous->ae_id != entry->ae_id || 488 previous->ae_tag != entry->ae_tag) 489 meets = 0; 490 491 if (previous->ae_flags) 492 meets = 0; 493 494 /* 495 * 1.5.1.4. The mask bits are a subset of the mask bits 496 * of the current ACE, and are also subset of 497 * the following: ACL_READ_DATA, 498 * ACL_WRITE_DATA, ACL_APPEND_DATA, ACL_EXECUTE 499 */ 500 if (previous->ae_perm & ~(entry->ae_perm)) 501 meets = 0; 502 503 if (previous->ae_perm & ~(ACL_READ_DATA | 504 ACL_WRITE_DATA | ACL_APPEND_DATA | ACL_EXECUTE)) 505 meets = 0; 506 } 507 508 if (!meets) { 509 /* 510 * Then the ACE of type DENY, with a who equal 511 * to the current ACE, flag bits equal to 512 * (<current ACE flags> & <ACE_IDENTIFIER_GROUP>) 513 * and no mask bits, is prepended. 514 */ 515 previous = entry; 516 entry = _acl_duplicate_entry(aclp, i); 517 518 /* Adjust counter, as we've just added an entry. */ 519 i++; 520 521 previous->ae_tag = entry->ae_tag; 522 previous->ae_id = entry->ae_id; 523 previous->ae_flags = entry->ae_flags; 524 previous->ae_perm = 0; 525 previous->ae_entry_type = ACL_ENTRY_TYPE_DENY; 526 } 527 528 /* 529 * 1.5.2. The following modifications are made to the prepended 530 * ACE. The intent is to mask the following ACE 531 * to disallow ACL_READ_DATA, ACL_WRITE_DATA, 532 * ACL_APPEND_DATA, or ACL_EXECUTE, based upon the group 533 * permissions of the new mode. As a special case, 534 * if the ACE matches the current owner of the file, 535 * the owner bits are used, rather than the group bits. 536 * This is reflected in the algorithm below. 537 */ 538 amode = mode >> 3; 539 540 /* 541 * If ACE4_IDENTIFIER_GROUP is not set, and the "who" field 542 * in ACE matches the owner of the file, we shift amode three 543 * more bits, in order to have the owner permission bits 544 * placed in the three low order bits of amode. 545 */ 546 if (entry->ae_tag == ACL_USER && entry->ae_id == file_owner_id) 547 amode = amode >> 3; 548 549 if (entry->ae_perm & ACL_READ_DATA) { 550 if (amode & READ) 551 previous->ae_perm &= ~ACL_READ_DATA; 552 else 553 previous->ae_perm |= ACL_READ_DATA; 554 } 555 556 if (entry->ae_perm & ACL_WRITE_DATA) { 557 if (amode & WRITE) 558 previous->ae_perm &= ~ACL_WRITE_DATA; 559 else 560 previous->ae_perm |= ACL_WRITE_DATA; 561 } 562 563 if (entry->ae_perm & ACL_APPEND_DATA) { 564 if (amode & WRITE) 565 previous->ae_perm &= ~ACL_APPEND_DATA; 566 else 567 previous->ae_perm |= ACL_APPEND_DATA; 568 } 569 570 if (entry->ae_perm & ACL_EXECUTE) { 571 if (amode & EXEC) 572 previous->ae_perm &= ~ACL_EXECUTE; 573 else 574 previous->ae_perm |= ACL_EXECUTE; 575 } 576 577 /* 578 * 1.5.3. If ACE4_IDENTIFIER_GROUP is set in the flags 579 * of the ALLOW ace: 580 * 581 * XXX: This point is not there in the Falkner's draft. 582 */ 583 if (entry->ae_tag == ACL_GROUP && 584 entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) { 585 mode_t extramode, ownermode; 586 extramode = (mode >> 3) & 07; 587 ownermode = mode >> 6; 588 extramode &= ~ownermode; 589 590 if (extramode) { 591 if (extramode & READ) { 592 entry->ae_perm &= ~ACL_READ_DATA; 593 previous->ae_perm &= ~ACL_READ_DATA; 594 } 595 596 if (extramode & WRITE) { 597 entry->ae_perm &= 598 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 599 previous->ae_perm &= 600 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 601 } 602 603 if (extramode & EXEC) { 604 entry->ae_perm &= ~ACL_EXECUTE; 605 previous->ae_perm &= ~ACL_EXECUTE; 606 } 607 } 608 } 609 } 610 611 /* 612 * 2. If there at least six ACEs, the final six ACEs are examined. 613 * If they are not equal to what we want, append six ACEs. 614 */ 615 must_append = 0; 616 if (aclp->acl_cnt < 6) { 617 must_append = 1; 618 } else { 619 a6 = &(aclp->acl_entry[aclp->acl_cnt - 1]); 620 a5 = &(aclp->acl_entry[aclp->acl_cnt - 2]); 621 a4 = &(aclp->acl_entry[aclp->acl_cnt - 3]); 622 a3 = &(aclp->acl_entry[aclp->acl_cnt - 4]); 623 a2 = &(aclp->acl_entry[aclp->acl_cnt - 5]); 624 a1 = &(aclp->acl_entry[aclp->acl_cnt - 6]); 625 626 if (!_acl_entry_matches(a1, ACL_USER_OBJ, 0, 627 ACL_ENTRY_TYPE_DENY)) 628 must_append = 1; 629 if (!_acl_entry_matches(a2, ACL_USER_OBJ, ACL_WRITE_ACL | 630 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 631 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW)) 632 must_append = 1; 633 if (!_acl_entry_matches(a3, ACL_GROUP_OBJ, 0, 634 ACL_ENTRY_TYPE_DENY)) 635 must_append = 1; 636 if (!_acl_entry_matches(a4, ACL_GROUP_OBJ, 0, 637 ACL_ENTRY_TYPE_ALLOW)) 638 must_append = 1; 639 if (!_acl_entry_matches(a5, ACL_EVERYONE, ACL_WRITE_ACL | 640 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 641 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY)) 642 must_append = 1; 643 if (!_acl_entry_matches(a6, ACL_EVERYONE, ACL_READ_ACL | 644 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | 645 ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW)) 646 must_append = 1; 647 } 648 649 if (must_append) { 650 KASSERT(aclp->acl_cnt + 6 <= ACL_MAX_ENTRIES, 651 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 652 653 a1 = _acl_append(aclp, ACL_USER_OBJ, 0, ACL_ENTRY_TYPE_DENY); 654 a2 = _acl_append(aclp, ACL_USER_OBJ, ACL_WRITE_ACL | 655 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 656 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW); 657 a3 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_DENY); 658 a4 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_ALLOW); 659 a5 = _acl_append(aclp, ACL_EVERYONE, ACL_WRITE_ACL | 660 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 661 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY); 662 a6 = _acl_append(aclp, ACL_EVERYONE, ACL_READ_ACL | 663 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | 664 ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW); 665 666 KASSERT(a1 != NULL && a2 != NULL && a3 != NULL && a4 != NULL && 667 a5 != NULL && a6 != NULL, ("couldn't append to ACL.")); 668 } 669 670 /* 671 * 3. The final six ACEs are adjusted according to the incoming mode. 672 */ 673 if (mode & S_IRUSR) 674 a2->ae_perm |= ACL_READ_DATA; 675 else 676 a1->ae_perm |= ACL_READ_DATA; 677 if (mode & S_IWUSR) 678 a2->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 679 else 680 a1->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 681 if (mode & S_IXUSR) 682 a2->ae_perm |= ACL_EXECUTE; 683 else 684 a1->ae_perm |= ACL_EXECUTE; 685 686 if (mode & S_IRGRP) 687 a4->ae_perm |= ACL_READ_DATA; 688 else 689 a3->ae_perm |= ACL_READ_DATA; 690 if (mode & S_IWGRP) 691 a4->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 692 else 693 a3->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 694 if (mode & S_IXGRP) 695 a4->ae_perm |= ACL_EXECUTE; 696 else 697 a3->ae_perm |= ACL_EXECUTE; 698 699 if (mode & S_IROTH) 700 a6->ae_perm |= ACL_READ_DATA; 701 else 702 a5->ae_perm |= ACL_READ_DATA; 703 if (mode & S_IWOTH) 704 a6->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 705 else 706 a5->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 707 if (mode & S_IXOTH) 708 a6->ae_perm |= ACL_EXECUTE; 709 else 710 a5->ae_perm |= ACL_EXECUTE; 711 } 712 713 #ifdef _KERNEL 714 void 715 acl_nfs4_sync_acl_from_mode(struct acl *aclp, mode_t mode, 716 int file_owner_id) 717 { 718 719 if (acl_nfs4_old_semantics) 720 acl_nfs4_sync_acl_from_mode_draft(aclp, mode, file_owner_id); 721 else 722 acl_nfs4_trivial_from_mode(aclp, mode); 723 } 724 #endif /* _KERNEL */ 725 726 void 727 acl_nfs4_sync_mode_from_acl(mode_t *_mode, const struct acl *aclp) 728 { 729 int i; 730 mode_t old_mode = *_mode, mode = 0, seen = 0; 731 const struct acl_entry *entry; 732 733 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 734 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 735 736 /* 737 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 738 * 739 * 3.16.6.1. Recomputing mode upon SETATTR of ACL 740 */ 741 742 for (i = 0; i < aclp->acl_cnt; i++) { 743 entry = &(aclp->acl_entry[i]); 744 745 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 746 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 747 continue; 748 749 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 750 continue; 751 752 if (entry->ae_tag == ACL_USER_OBJ) { 753 if ((entry->ae_perm & ACL_READ_DATA) && 754 ((seen & S_IRUSR) == 0)) { 755 seen |= S_IRUSR; 756 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 757 mode |= S_IRUSR; 758 } 759 if ((entry->ae_perm & ACL_WRITE_DATA) && 760 ((seen & S_IWUSR) == 0)) { 761 seen |= S_IWUSR; 762 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 763 mode |= S_IWUSR; 764 } 765 if ((entry->ae_perm & ACL_EXECUTE) && 766 ((seen & S_IXUSR) == 0)) { 767 seen |= S_IXUSR; 768 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 769 mode |= S_IXUSR; 770 } 771 } else if (entry->ae_tag == ACL_GROUP_OBJ) { 772 if ((entry->ae_perm & ACL_READ_DATA) && 773 ((seen & S_IRGRP) == 0)) { 774 seen |= S_IRGRP; 775 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 776 mode |= S_IRGRP; 777 } 778 if ((entry->ae_perm & ACL_WRITE_DATA) && 779 ((seen & S_IWGRP) == 0)) { 780 seen |= S_IWGRP; 781 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 782 mode |= S_IWGRP; 783 } 784 if ((entry->ae_perm & ACL_EXECUTE) && 785 ((seen & S_IXGRP) == 0)) { 786 seen |= S_IXGRP; 787 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 788 mode |= S_IXGRP; 789 } 790 } else if (entry->ae_tag == ACL_EVERYONE) { 791 if (entry->ae_perm & ACL_READ_DATA) { 792 if ((seen & S_IRUSR) == 0) { 793 seen |= S_IRUSR; 794 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 795 mode |= S_IRUSR; 796 } 797 if ((seen & S_IRGRP) == 0) { 798 seen |= S_IRGRP; 799 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 800 mode |= S_IRGRP; 801 } 802 if ((seen & S_IROTH) == 0) { 803 seen |= S_IROTH; 804 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 805 mode |= S_IROTH; 806 } 807 } 808 if (entry->ae_perm & ACL_WRITE_DATA) { 809 if ((seen & S_IWUSR) == 0) { 810 seen |= S_IWUSR; 811 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 812 mode |= S_IWUSR; 813 } 814 if ((seen & S_IWGRP) == 0) { 815 seen |= S_IWGRP; 816 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 817 mode |= S_IWGRP; 818 } 819 if ((seen & S_IWOTH) == 0) { 820 seen |= S_IWOTH; 821 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 822 mode |= S_IWOTH; 823 } 824 } 825 if (entry->ae_perm & ACL_EXECUTE) { 826 if ((seen & S_IXUSR) == 0) { 827 seen |= S_IXUSR; 828 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 829 mode |= S_IXUSR; 830 } 831 if ((seen & S_IXGRP) == 0) { 832 seen |= S_IXGRP; 833 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 834 mode |= S_IXGRP; 835 } 836 if ((seen & S_IXOTH) == 0) { 837 seen |= S_IXOTH; 838 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 839 mode |= S_IXOTH; 840 } 841 } 842 } 843 } 844 845 *_mode = mode | (old_mode & ACL_PRESERVE_MASK); 846 } 847 848 #ifdef _KERNEL 849 /* 850 * Calculate inherited ACL in a manner compatible with NFSv4 Minor Version 1, 851 * draft-ietf-nfsv4-minorversion1-03.txt. 852 */ 853 static void 854 acl_nfs4_compute_inherited_acl_draft(const struct acl *parent_aclp, 855 struct acl *child_aclp, mode_t mode, int file_owner_id, 856 int is_directory) 857 { 858 int i, flags; 859 const struct acl_entry *parent_entry; 860 struct acl_entry *entry, *copy; 861 862 KASSERT(child_aclp->acl_cnt == 0, ("child_aclp->acl_cnt == 0")); 863 KASSERT(parent_aclp->acl_cnt <= ACL_MAX_ENTRIES, 864 ("parent_aclp->acl_cnt <= ACL_MAX_ENTRIES")); 865 866 /* 867 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 868 * 869 * 3.16.6.2. Applying the mode given to CREATE or OPEN 870 * to an inherited ACL 871 */ 872 873 /* 874 * 1. Form an ACL that is the concatenation of all inheritable ACEs. 875 */ 876 for (i = 0; i < parent_aclp->acl_cnt; i++) { 877 parent_entry = &(parent_aclp->acl_entry[i]); 878 flags = parent_entry->ae_flags; 879 880 /* 881 * Entry is not inheritable at all. 882 */ 883 if ((flags & (ACL_ENTRY_DIRECTORY_INHERIT | 884 ACL_ENTRY_FILE_INHERIT)) == 0) 885 continue; 886 887 /* 888 * We're creating a file, but entry is not inheritable 889 * by files. 890 */ 891 if (!is_directory && (flags & ACL_ENTRY_FILE_INHERIT) == 0) 892 continue; 893 894 /* 895 * Entry is inheritable only by files, but has NO_PROPAGATE 896 * flag set, and we're creating a directory, so it wouldn't 897 * propagate to any file in that directory anyway. 898 */ 899 if (is_directory && 900 (flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0 && 901 (flags & ACL_ENTRY_NO_PROPAGATE_INHERIT)) 902 continue; 903 904 KASSERT(child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 905 ("child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 906 child_aclp->acl_entry[child_aclp->acl_cnt] = *parent_entry; 907 child_aclp->acl_cnt++; 908 } 909 910 /* 911 * 2. For each entry in the new ACL, adjust its flags, possibly 912 * creating two entries in place of one. 913 */ 914 for (i = 0; i < child_aclp->acl_cnt; i++) { 915 entry = &(child_aclp->acl_entry[i]); 916 917 /* 918 * This is not in the specification, but SunOS 919 * apparently does that. 920 */ 921 if (((entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT) || 922 !is_directory) && 923 entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 924 entry->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER); 925 926 /* 927 * 2.A. If the ACL_ENTRY_NO_PROPAGATE_INHERIT is set, or if the object 928 * being created is not a directory, then clear the 929 * following flags: ACL_ENTRY_NO_PROPAGATE_INHERIT, 930 * ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT, 931 * ACL_ENTRY_INHERIT_ONLY. 932 */ 933 if (entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT || 934 !is_directory) { 935 entry->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 936 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 937 ACL_ENTRY_INHERIT_ONLY); 938 939 /* 940 * Continue on to the next ACE. 941 */ 942 continue; 943 } 944 945 /* 946 * 2.B. If the object is a directory and ACL_ENTRY_FILE_INHERIT 947 * is set, but ACL_ENTRY_NO_PROPAGATE_INHERIT is not set, ensure 948 * that ACL_ENTRY_INHERIT_ONLY is set. Continue to the 949 * next ACE. Otherwise... 950 */ 951 /* 952 * XXX: Read it again and make sure what does the "otherwise" 953 * apply to. 954 */ 955 if (is_directory && 956 (entry->ae_flags & ACL_ENTRY_FILE_INHERIT) && 957 ((entry->ae_flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0)) { 958 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 959 continue; 960 } 961 962 /* 963 * 2.C. If the type of the ACE is neither ALLOW nor deny, 964 * then continue. 965 */ 966 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 967 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 968 continue; 969 970 /* 971 * 2.D. Copy the original ACE into a second, adjacent ACE. 972 */ 973 copy = _acl_duplicate_entry(child_aclp, i); 974 975 /* 976 * 2.E. On the first ACE, ensure that ACL_ENTRY_INHERIT_ONLY 977 * is set. 978 */ 979 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 980 981 /* 982 * 2.F. On the second ACE, clear the following flags: 983 * ACL_ENTRY_NO_PROPAGATE_INHERIT, ACL_ENTRY_FILE_INHERIT, 984 * ACL_ENTRY_DIRECTORY_INHERIT, ACL_ENTRY_INHERIT_ONLY. 985 */ 986 copy->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 987 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 988 ACL_ENTRY_INHERIT_ONLY); 989 990 /* 991 * 2.G. On the second ACE, if the type is ALLOW, 992 * an implementation MAY clear the following 993 * mask bits: ACL_WRITE_ACL, ACL_WRITE_OWNER. 994 */ 995 if (copy->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 996 copy->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER); 997 998 /* 999 * Increment the counter to skip the copied entry. 1000 */ 1001 i++; 1002 } 1003 1004 /* 1005 * 3. To ensure that the mode is honored, apply the algorithm describe 1006 * in Section 2.16.6.3, using the mode that is to be used for file 1007 * creation. 1008 */ 1009 acl_nfs4_sync_acl_from_mode(child_aclp, mode, file_owner_id); 1010 } 1011 #endif /* _KERNEL */ 1012 1013 /* 1014 * Populate the ACL with entries inherited from parent_aclp. 1015 */ 1016 static void 1017 acl_nfs4_inherit_entries(const struct acl *parent_aclp, 1018 struct acl *child_aclp, mode_t mode, int file_owner_id, 1019 int is_directory) 1020 { 1021 int i, flags, tag; 1022 const struct acl_entry *parent_entry; 1023 struct acl_entry *entry; 1024 1025 KASSERT(parent_aclp->acl_cnt <= ACL_MAX_ENTRIES, 1026 ("parent_aclp->acl_cnt <= ACL_MAX_ENTRIES")); 1027 1028 for (i = 0; i < parent_aclp->acl_cnt; i++) { 1029 parent_entry = &(parent_aclp->acl_entry[i]); 1030 flags = parent_entry->ae_flags; 1031 tag = parent_entry->ae_tag; 1032 1033 /* 1034 * Don't inherit owner@, group@, or everyone@ entries. 1035 */ 1036 if (tag == ACL_USER_OBJ || tag == ACL_GROUP_OBJ || 1037 tag == ACL_EVERYONE) 1038 continue; 1039 1040 /* 1041 * Entry is not inheritable at all. 1042 */ 1043 if ((flags & (ACL_ENTRY_DIRECTORY_INHERIT | 1044 ACL_ENTRY_FILE_INHERIT)) == 0) 1045 continue; 1046 1047 /* 1048 * We're creating a file, but entry is not inheritable 1049 * by files. 1050 */ 1051 if (!is_directory && (flags & ACL_ENTRY_FILE_INHERIT) == 0) 1052 continue; 1053 1054 /* 1055 * Entry is inheritable only by files, but has NO_PROPAGATE 1056 * flag set, and we're creating a directory, so it wouldn't 1057 * propagate to any file in that directory anyway. 1058 */ 1059 if (is_directory && 1060 (flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0 && 1061 (flags & ACL_ENTRY_NO_PROPAGATE_INHERIT)) 1062 continue; 1063 1064 /* 1065 * Entry qualifies for being inherited. 1066 */ 1067 KASSERT(child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 1068 ("child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 1069 entry = &(child_aclp->acl_entry[child_aclp->acl_cnt]); 1070 *entry = *parent_entry; 1071 child_aclp->acl_cnt++; 1072 1073 entry->ae_flags &= ~ACL_ENTRY_INHERIT_ONLY; 1074 entry->ae_flags |= ACL_ENTRY_INHERITED; 1075 1076 /* 1077 * If the type of the ACE is neither ALLOW nor DENY, 1078 * then leave it as it is and proceed to the next one. 1079 */ 1080 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 1081 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 1082 continue; 1083 1084 /* 1085 * If the ACL_ENTRY_NO_PROPAGATE_INHERIT is set, or if 1086 * the object being created is not a directory, then clear 1087 * the following flags: ACL_ENTRY_NO_PROPAGATE_INHERIT, 1088 * ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT, 1089 * ACL_ENTRY_INHERIT_ONLY. 1090 */ 1091 if (entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT || 1092 !is_directory) { 1093 entry->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 1094 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 1095 ACL_ENTRY_INHERIT_ONLY); 1096 } 1097 1098 /* 1099 * If the object is a directory and ACL_ENTRY_FILE_INHERIT 1100 * is set, but ACL_ENTRY_DIRECTORY_INHERIT is not set, ensure 1101 * that ACL_ENTRY_INHERIT_ONLY is set. 1102 */ 1103 if (is_directory && 1104 (entry->ae_flags & ACL_ENTRY_FILE_INHERIT) && 1105 ((entry->ae_flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0)) { 1106 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 1107 } 1108 1109 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW && 1110 (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) == 0) { 1111 /* 1112 * Some permissions must never be inherited. 1113 */ 1114 entry->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER | 1115 ACL_WRITE_NAMED_ATTRS | ACL_WRITE_ATTRIBUTES); 1116 1117 /* 1118 * Others must be masked according to the file mode. 1119 */ 1120 if ((mode & S_IRGRP) == 0) 1121 entry->ae_perm &= ~ACL_READ_DATA; 1122 if ((mode & S_IWGRP) == 0) 1123 entry->ae_perm &= 1124 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 1125 if ((mode & S_IXGRP) == 0) 1126 entry->ae_perm &= ~ACL_EXECUTE; 1127 } 1128 } 1129 } 1130 1131 /* 1132 * Calculate inherited ACL in a manner compatible with PSARC/2010/029. 1133 * It's also being used to calculate a trivial ACL, by inheriting from 1134 * a NULL ACL. 1135 */ 1136 static void 1137 acl_nfs4_compute_inherited_acl_psarc(const struct acl *parent_aclp, 1138 struct acl *aclp, mode_t mode, int file_owner_id, int is_directory) 1139 { 1140 acl_perm_t user_allow_first = 0, user_deny = 0, group_deny = 0; 1141 acl_perm_t user_allow, group_allow, everyone_allow; 1142 1143 KASSERT(aclp->acl_cnt == 0, ("aclp->acl_cnt == 0")); 1144 1145 user_allow = group_allow = everyone_allow = ACL_READ_ACL | 1146 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | ACL_SYNCHRONIZE; 1147 user_allow |= ACL_WRITE_ACL | ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 1148 ACL_WRITE_NAMED_ATTRS; 1149 1150 if (mode & S_IRUSR) 1151 user_allow |= ACL_READ_DATA; 1152 if (mode & S_IWUSR) 1153 user_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 1154 if (mode & S_IXUSR) 1155 user_allow |= ACL_EXECUTE; 1156 1157 if (mode & S_IRGRP) 1158 group_allow |= ACL_READ_DATA; 1159 if (mode & S_IWGRP) 1160 group_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 1161 if (mode & S_IXGRP) 1162 group_allow |= ACL_EXECUTE; 1163 1164 if (mode & S_IROTH) 1165 everyone_allow |= ACL_READ_DATA; 1166 if (mode & S_IWOTH) 1167 everyone_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 1168 if (mode & S_IXOTH) 1169 everyone_allow |= ACL_EXECUTE; 1170 1171 user_deny = ((group_allow | everyone_allow) & ~user_allow); 1172 group_deny = everyone_allow & ~group_allow; 1173 user_allow_first = group_deny & ~user_deny; 1174 1175 if (user_allow_first != 0) 1176 _acl_append(aclp, ACL_USER_OBJ, user_allow_first, 1177 ACL_ENTRY_TYPE_ALLOW); 1178 if (user_deny != 0) 1179 _acl_append(aclp, ACL_USER_OBJ, user_deny, 1180 ACL_ENTRY_TYPE_DENY); 1181 if (group_deny != 0) 1182 _acl_append(aclp, ACL_GROUP_OBJ, group_deny, 1183 ACL_ENTRY_TYPE_DENY); 1184 1185 if (parent_aclp != NULL) 1186 acl_nfs4_inherit_entries(parent_aclp, aclp, mode, 1187 file_owner_id, is_directory); 1188 1189 _acl_append(aclp, ACL_USER_OBJ, user_allow, ACL_ENTRY_TYPE_ALLOW); 1190 _acl_append(aclp, ACL_GROUP_OBJ, group_allow, ACL_ENTRY_TYPE_ALLOW); 1191 _acl_append(aclp, ACL_EVERYONE, everyone_allow, ACL_ENTRY_TYPE_ALLOW); 1192 } 1193 1194 #ifdef _KERNEL 1195 void 1196 acl_nfs4_compute_inherited_acl(const struct acl *parent_aclp, 1197 struct acl *child_aclp, mode_t mode, int file_owner_id, 1198 int is_directory) 1199 { 1200 1201 if (acl_nfs4_old_semantics) 1202 acl_nfs4_compute_inherited_acl_draft(parent_aclp, child_aclp, 1203 mode, file_owner_id, is_directory); 1204 else 1205 acl_nfs4_compute_inherited_acl_psarc(parent_aclp, child_aclp, 1206 mode, file_owner_id, is_directory); 1207 } 1208 #endif /* _KERNEL */ 1209 1210 /* 1211 * Calculate trivial ACL in a manner compatible with PSARC/2010/029. 1212 * Note that this results in an ACL different from (but semantically 1213 * equal to) the "canonical six" trivial ACL computed using algorithm 1214 * described in draft-ietf-nfsv4-minorversion1-03.txt, 3.16.6.2. 1215 */ 1216 static void 1217 acl_nfs4_trivial_from_mode(struct acl *aclp, mode_t mode) 1218 { 1219 1220 aclp->acl_cnt = 0; 1221 acl_nfs4_compute_inherited_acl_psarc(NULL, aclp, mode, -1, -1); 1222 } 1223 1224 #ifndef _KERNEL 1225 /* 1226 * This routine is used by libc to implement acl_strip_np(3) 1227 * and acl_is_trivial_np(3). 1228 */ 1229 void 1230 acl_nfs4_trivial_from_mode_libc(struct acl *aclp, int mode, int canonical_six) 1231 { 1232 1233 aclp->acl_cnt = 0; 1234 if (canonical_six) 1235 acl_nfs4_sync_acl_from_mode_draft(aclp, mode, -1); 1236 else 1237 acl_nfs4_trivial_from_mode(aclp, mode); 1238 } 1239 #endif /* !_KERNEL */ 1240 1241 #ifdef _KERNEL 1242 static int 1243 _acls_are_equal(const struct acl *a, const struct acl *b) 1244 { 1245 int i; 1246 const struct acl_entry *entrya, *entryb; 1247 1248 if (a->acl_cnt != b->acl_cnt) 1249 return (0); 1250 1251 for (i = 0; i < b->acl_cnt; i++) { 1252 entrya = &(a->acl_entry[i]); 1253 entryb = &(b->acl_entry[i]); 1254 1255 if (entrya->ae_tag != entryb->ae_tag || 1256 entrya->ae_id != entryb->ae_id || 1257 entrya->ae_perm != entryb->ae_perm || 1258 entrya->ae_entry_type != entryb->ae_entry_type || 1259 entrya->ae_flags != entryb->ae_flags) 1260 return (0); 1261 } 1262 1263 return (1); 1264 } 1265 1266 /* 1267 * This routine is used to determine whether to remove extended attribute 1268 * that stores ACL contents. 1269 */ 1270 int 1271 acl_nfs4_is_trivial(const struct acl *aclp, int file_owner_id) 1272 { 1273 int trivial; 1274 mode_t tmpmode = 0; 1275 struct acl *tmpaclp; 1276 1277 if (aclp->acl_cnt > 6) 1278 return (0); 1279 1280 /* 1281 * Compute the mode from the ACL, then compute new ACL from that mode. 1282 * If the ACLs are identical, then the ACL is trivial. 1283 * 1284 * XXX: I guess there is a faster way to do this. However, even 1285 * this slow implementation significantly speeds things up 1286 * for files that don't have non-trivial ACLs - it's critical 1287 * for performance to not use EA when they are not needed. 1288 * 1289 * First try the PSARC/2010/029 semantics. 1290 */ 1291 tmpaclp = acl_alloc(M_WAITOK | M_ZERO); 1292 acl_nfs4_sync_mode_from_acl(&tmpmode, aclp); 1293 acl_nfs4_trivial_from_mode(tmpaclp, tmpmode); 1294 trivial = _acls_are_equal(aclp, tmpaclp); 1295 if (trivial) { 1296 acl_free(tmpaclp); 1297 return (trivial); 1298 } 1299 1300 /* 1301 * Check if it's a draft-ietf-nfsv4-minorversion1-03.txt trivial ACL. 1302 */ 1303 tmpaclp->acl_cnt = 0; 1304 acl_nfs4_sync_acl_from_mode_draft(tmpaclp, tmpmode, file_owner_id); 1305 trivial = _acls_are_equal(aclp, tmpaclp); 1306 acl_free(tmpaclp); 1307 1308 return (trivial); 1309 } 1310 #endif /* _KERNEL */ 1311 1312 int 1313 acl_nfs4_check(const struct acl *aclp, int is_directory) 1314 { 1315 int i; 1316 const struct acl_entry *entry; 1317 1318 /* 1319 * The spec doesn't seem to say anything about ACL validity. 1320 * It seems there is not much to do here. There is even no need 1321 * to count "owner@" or "everyone@" (ACL_USER_OBJ and ACL_EVERYONE) 1322 * entries, as there can be several of them and that's perfectly 1323 * valid. There can be none of them too. Really. 1324 */ 1325 1326 if (aclp->acl_cnt > ACL_MAX_ENTRIES || aclp->acl_cnt <= 0) 1327 return (EINVAL); 1328 1329 for (i = 0; i < aclp->acl_cnt; i++) { 1330 entry = &(aclp->acl_entry[i]); 1331 1332 switch (entry->ae_tag) { 1333 case ACL_USER_OBJ: 1334 case ACL_GROUP_OBJ: 1335 case ACL_EVERYONE: 1336 if (entry->ae_id != ACL_UNDEFINED_ID) 1337 return (EINVAL); 1338 break; 1339 1340 case ACL_USER: 1341 case ACL_GROUP: 1342 if (entry->ae_id == ACL_UNDEFINED_ID) 1343 return (EINVAL); 1344 break; 1345 1346 default: 1347 return (EINVAL); 1348 } 1349 1350 if ((entry->ae_perm | ACL_NFS4_PERM_BITS) != ACL_NFS4_PERM_BITS) 1351 return (EINVAL); 1352 1353 /* 1354 * Disallow ACL_ENTRY_TYPE_AUDIT and ACL_ENTRY_TYPE_ALARM for now. 1355 */ 1356 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 1357 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 1358 return (EINVAL); 1359 1360 if ((entry->ae_flags | ACL_FLAGS_BITS) != ACL_FLAGS_BITS) 1361 return (EINVAL); 1362 1363 /* Disallow unimplemented flags. */ 1364 if (entry->ae_flags & (ACL_ENTRY_SUCCESSFUL_ACCESS | 1365 ACL_ENTRY_FAILED_ACCESS)) 1366 return (EINVAL); 1367 1368 /* Disallow flags not allowed for ordinary files. */ 1369 if (!is_directory) { 1370 if (entry->ae_flags & (ACL_ENTRY_FILE_INHERIT | 1371 ACL_ENTRY_DIRECTORY_INHERIT | 1372 ACL_ENTRY_NO_PROPAGATE_INHERIT | ACL_ENTRY_INHERIT_ONLY)) 1373 return (EINVAL); 1374 } 1375 } 1376 1377 return (0); 1378 } 1379 1380 #ifdef _KERNEL 1381 static int 1382 acl_nfs4_modload(module_t module, int what, void *arg) 1383 { 1384 int ret; 1385 1386 ret = 0; 1387 1388 switch (what) { 1389 case MOD_LOAD: 1390 case MOD_SHUTDOWN: 1391 break; 1392 1393 case MOD_QUIESCE: 1394 /* XXX TODO */ 1395 ret = 0; 1396 break; 1397 1398 case MOD_UNLOAD: 1399 /* XXX TODO */ 1400 ret = 0; 1401 break; 1402 default: 1403 ret = EINVAL; 1404 break; 1405 } 1406 1407 return (ret); 1408 } 1409 1410 static moduledata_t acl_nfs4_mod = { 1411 "acl_nfs4", 1412 acl_nfs4_modload, 1413 NULL 1414 }; 1415 1416 /* 1417 * XXX TODO: which subsystem, order? 1418 */ 1419 DECLARE_MODULE(acl_nfs4, acl_nfs4_mod, SI_SUB_VFS, SI_ORDER_FIRST); 1420 MODULE_VERSION(acl_nfs4, 1); 1421 #endif /* _KERNEL */
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