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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: releng/12.0/sys/kern/subr_acl_nfs4.c 326271 2017-11-27 15:20:12Z pfg $"); 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, int entry_index) 353 { 354 int 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 i, meets, must_append; 372 struct acl_entry *entry, *copy, *previous, 373 *a1, *a2, *a3, *a4, *a5, *a6; 374 mode_t amode; 375 const int READ = 04; 376 const int WRITE = 02; 377 const int EXEC = 01; 378 379 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 380 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 381 382 /* 383 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 384 * 385 * 3.16.6.3. Applying a Mode to an Existing ACL 386 */ 387 388 /* 389 * 1. For each ACE: 390 */ 391 for (i = 0; i < aclp->acl_cnt; i++) { 392 entry = &(aclp->acl_entry[i]); 393 394 /* 395 * 1.1. If the type is neither ALLOW or DENY - skip. 396 */ 397 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 398 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 399 continue; 400 401 /* 402 * 1.2. If ACL_ENTRY_INHERIT_ONLY is set - skip. 403 */ 404 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 405 continue; 406 407 /* 408 * 1.3. If ACL_ENTRY_FILE_INHERIT or ACL_ENTRY_DIRECTORY_INHERIT 409 * are set: 410 */ 411 if (entry->ae_flags & 412 (ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT)) { 413 /* 414 * 1.3.1. A copy of the current ACE is made, and placed 415 * in the ACL immediately following the current 416 * ACE. 417 */ 418 copy = _acl_duplicate_entry(aclp, i); 419 420 /* 421 * 1.3.2. In the first ACE, the flag 422 * ACL_ENTRY_INHERIT_ONLY is set. 423 */ 424 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 425 426 /* 427 * 1.3.3. In the second ACE, the following flags 428 * are cleared: 429 * ACL_ENTRY_FILE_INHERIT, 430 * ACL_ENTRY_DIRECTORY_INHERIT, 431 * ACL_ENTRY_NO_PROPAGATE_INHERIT. 432 */ 433 copy->ae_flags &= ~(ACL_ENTRY_FILE_INHERIT | 434 ACL_ENTRY_DIRECTORY_INHERIT | 435 ACL_ENTRY_NO_PROPAGATE_INHERIT); 436 437 /* 438 * The algorithm continues on with the second ACE. 439 */ 440 i++; 441 entry = copy; 442 } 443 444 /* 445 * 1.4. If it's owner@, group@ or everyone@ entry, clear 446 * ACL_READ_DATA, ACL_WRITE_DATA, ACL_APPEND_DATA 447 * and ACL_EXECUTE. Continue to the next entry. 448 */ 449 if (entry->ae_tag == ACL_USER_OBJ || 450 entry->ae_tag == ACL_GROUP_OBJ || 451 entry->ae_tag == ACL_EVERYONE) { 452 entry->ae_perm &= ~(ACL_READ_DATA | ACL_WRITE_DATA | 453 ACL_APPEND_DATA | ACL_EXECUTE); 454 continue; 455 } 456 457 /* 458 * 1.5. Otherwise, if the "who" field did not match one 459 * of OWNER@, GROUP@, EVERYONE@: 460 * 461 * 1.5.1. If the type is ALLOW, check the preceding ACE. 462 * If it does not meet all of the following criteria: 463 */ 464 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW) 465 continue; 466 467 meets = 0; 468 if (i > 0) { 469 meets = 1; 470 previous = &(aclp->acl_entry[i - 1]); 471 472 /* 473 * 1.5.1.1. The type field is DENY, 474 */ 475 if (previous->ae_entry_type != ACL_ENTRY_TYPE_DENY) 476 meets = 0; 477 478 /* 479 * 1.5.1.2. The "who" field is the same as the current 480 * ACE, 481 * 482 * 1.5.1.3. The flag bit ACE4_IDENTIFIER_GROUP 483 * is the same as it is in the current ACE, 484 * and no other flag bits are set, 485 */ 486 if (previous->ae_id != entry->ae_id || 487 previous->ae_tag != entry->ae_tag) 488 meets = 0; 489 490 if (previous->ae_flags) 491 meets = 0; 492 493 /* 494 * 1.5.1.4. The mask bits are a subset of the mask bits 495 * of the current ACE, and are also subset of 496 * the following: ACL_READ_DATA, 497 * ACL_WRITE_DATA, ACL_APPEND_DATA, ACL_EXECUTE 498 */ 499 if (previous->ae_perm & ~(entry->ae_perm)) 500 meets = 0; 501 502 if (previous->ae_perm & ~(ACL_READ_DATA | 503 ACL_WRITE_DATA | ACL_APPEND_DATA | ACL_EXECUTE)) 504 meets = 0; 505 } 506 507 if (!meets) { 508 /* 509 * Then the ACE of type DENY, with a who equal 510 * to the current ACE, flag bits equal to 511 * (<current ACE flags> & <ACE_IDENTIFIER_GROUP>) 512 * and no mask bits, is prepended. 513 */ 514 previous = entry; 515 entry = _acl_duplicate_entry(aclp, i); 516 517 /* Adjust counter, as we've just added an entry. */ 518 i++; 519 520 previous->ae_tag = entry->ae_tag; 521 previous->ae_id = entry->ae_id; 522 previous->ae_flags = entry->ae_flags; 523 previous->ae_perm = 0; 524 previous->ae_entry_type = ACL_ENTRY_TYPE_DENY; 525 } 526 527 /* 528 * 1.5.2. The following modifications are made to the prepended 529 * ACE. The intent is to mask the following ACE 530 * to disallow ACL_READ_DATA, ACL_WRITE_DATA, 531 * ACL_APPEND_DATA, or ACL_EXECUTE, based upon the group 532 * permissions of the new mode. As a special case, 533 * if the ACE matches the current owner of the file, 534 * the owner bits are used, rather than the group bits. 535 * This is reflected in the algorithm below. 536 */ 537 amode = mode >> 3; 538 539 /* 540 * If ACE4_IDENTIFIER_GROUP is not set, and the "who" field 541 * in ACE matches the owner of the file, we shift amode three 542 * more bits, in order to have the owner permission bits 543 * placed in the three low order bits of amode. 544 */ 545 if (entry->ae_tag == ACL_USER && entry->ae_id == file_owner_id) 546 amode = amode >> 3; 547 548 if (entry->ae_perm & ACL_READ_DATA) { 549 if (amode & READ) 550 previous->ae_perm &= ~ACL_READ_DATA; 551 else 552 previous->ae_perm |= ACL_READ_DATA; 553 } 554 555 if (entry->ae_perm & ACL_WRITE_DATA) { 556 if (amode & WRITE) 557 previous->ae_perm &= ~ACL_WRITE_DATA; 558 else 559 previous->ae_perm |= ACL_WRITE_DATA; 560 } 561 562 if (entry->ae_perm & ACL_APPEND_DATA) { 563 if (amode & WRITE) 564 previous->ae_perm &= ~ACL_APPEND_DATA; 565 else 566 previous->ae_perm |= ACL_APPEND_DATA; 567 } 568 569 if (entry->ae_perm & ACL_EXECUTE) { 570 if (amode & EXEC) 571 previous->ae_perm &= ~ACL_EXECUTE; 572 else 573 previous->ae_perm |= ACL_EXECUTE; 574 } 575 576 /* 577 * 1.5.3. If ACE4_IDENTIFIER_GROUP is set in the flags 578 * of the ALLOW ace: 579 * 580 * XXX: This point is not there in the Falkner's draft. 581 */ 582 if (entry->ae_tag == ACL_GROUP && 583 entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) { 584 mode_t extramode, ownermode; 585 extramode = (mode >> 3) & 07; 586 ownermode = mode >> 6; 587 extramode &= ~ownermode; 588 589 if (extramode) { 590 if (extramode & READ) { 591 entry->ae_perm &= ~ACL_READ_DATA; 592 previous->ae_perm &= ~ACL_READ_DATA; 593 } 594 595 if (extramode & WRITE) { 596 entry->ae_perm &= 597 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 598 previous->ae_perm &= 599 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 600 } 601 602 if (extramode & EXEC) { 603 entry->ae_perm &= ~ACL_EXECUTE; 604 previous->ae_perm &= ~ACL_EXECUTE; 605 } 606 } 607 } 608 } 609 610 /* 611 * 2. If there at least six ACEs, the final six ACEs are examined. 612 * If they are not equal to what we want, append six ACEs. 613 */ 614 must_append = 0; 615 if (aclp->acl_cnt < 6) { 616 must_append = 1; 617 } else { 618 a6 = &(aclp->acl_entry[aclp->acl_cnt - 1]); 619 a5 = &(aclp->acl_entry[aclp->acl_cnt - 2]); 620 a4 = &(aclp->acl_entry[aclp->acl_cnt - 3]); 621 a3 = &(aclp->acl_entry[aclp->acl_cnt - 4]); 622 a2 = &(aclp->acl_entry[aclp->acl_cnt - 5]); 623 a1 = &(aclp->acl_entry[aclp->acl_cnt - 6]); 624 625 if (!_acl_entry_matches(a1, ACL_USER_OBJ, 0, 626 ACL_ENTRY_TYPE_DENY)) 627 must_append = 1; 628 if (!_acl_entry_matches(a2, ACL_USER_OBJ, ACL_WRITE_ACL | 629 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 630 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW)) 631 must_append = 1; 632 if (!_acl_entry_matches(a3, ACL_GROUP_OBJ, 0, 633 ACL_ENTRY_TYPE_DENY)) 634 must_append = 1; 635 if (!_acl_entry_matches(a4, ACL_GROUP_OBJ, 0, 636 ACL_ENTRY_TYPE_ALLOW)) 637 must_append = 1; 638 if (!_acl_entry_matches(a5, ACL_EVERYONE, ACL_WRITE_ACL | 639 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 640 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY)) 641 must_append = 1; 642 if (!_acl_entry_matches(a6, ACL_EVERYONE, ACL_READ_ACL | 643 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | 644 ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW)) 645 must_append = 1; 646 } 647 648 if (must_append) { 649 KASSERT(aclp->acl_cnt + 6 <= ACL_MAX_ENTRIES, 650 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 651 652 a1 = _acl_append(aclp, ACL_USER_OBJ, 0, ACL_ENTRY_TYPE_DENY); 653 a2 = _acl_append(aclp, ACL_USER_OBJ, ACL_WRITE_ACL | 654 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 655 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW); 656 a3 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_DENY); 657 a4 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_ALLOW); 658 a5 = _acl_append(aclp, ACL_EVERYONE, ACL_WRITE_ACL | 659 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 660 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY); 661 a6 = _acl_append(aclp, ACL_EVERYONE, ACL_READ_ACL | 662 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | 663 ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW); 664 665 KASSERT(a1 != NULL && a2 != NULL && a3 != NULL && a4 != NULL && 666 a5 != NULL && a6 != NULL, ("couldn't append to ACL.")); 667 } 668 669 /* 670 * 3. The final six ACEs are adjusted according to the incoming mode. 671 */ 672 if (mode & S_IRUSR) 673 a2->ae_perm |= ACL_READ_DATA; 674 else 675 a1->ae_perm |= ACL_READ_DATA; 676 if (mode & S_IWUSR) 677 a2->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 678 else 679 a1->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 680 if (mode & S_IXUSR) 681 a2->ae_perm |= ACL_EXECUTE; 682 else 683 a1->ae_perm |= ACL_EXECUTE; 684 685 if (mode & S_IRGRP) 686 a4->ae_perm |= ACL_READ_DATA; 687 else 688 a3->ae_perm |= ACL_READ_DATA; 689 if (mode & S_IWGRP) 690 a4->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 691 else 692 a3->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 693 if (mode & S_IXGRP) 694 a4->ae_perm |= ACL_EXECUTE; 695 else 696 a3->ae_perm |= ACL_EXECUTE; 697 698 if (mode & S_IROTH) 699 a6->ae_perm |= ACL_READ_DATA; 700 else 701 a5->ae_perm |= ACL_READ_DATA; 702 if (mode & S_IWOTH) 703 a6->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 704 else 705 a5->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 706 if (mode & S_IXOTH) 707 a6->ae_perm |= ACL_EXECUTE; 708 else 709 a5->ae_perm |= ACL_EXECUTE; 710 } 711 712 #ifdef _KERNEL 713 void 714 acl_nfs4_sync_acl_from_mode(struct acl *aclp, mode_t mode, 715 int file_owner_id) 716 { 717 718 if (acl_nfs4_old_semantics) 719 acl_nfs4_sync_acl_from_mode_draft(aclp, mode, file_owner_id); 720 else 721 acl_nfs4_trivial_from_mode(aclp, mode); 722 } 723 #endif /* _KERNEL */ 724 725 void 726 acl_nfs4_sync_mode_from_acl(mode_t *_mode, const struct acl *aclp) 727 { 728 int i; 729 mode_t old_mode = *_mode, mode = 0, seen = 0; 730 const struct acl_entry *entry; 731 732 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 733 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 734 735 /* 736 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 737 * 738 * 3.16.6.1. Recomputing mode upon SETATTR of ACL 739 */ 740 741 for (i = 0; i < aclp->acl_cnt; i++) { 742 entry = &(aclp->acl_entry[i]); 743 744 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 745 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 746 continue; 747 748 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 749 continue; 750 751 if (entry->ae_tag == ACL_USER_OBJ) { 752 if ((entry->ae_perm & ACL_READ_DATA) && 753 ((seen & S_IRUSR) == 0)) { 754 seen |= S_IRUSR; 755 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 756 mode |= S_IRUSR; 757 } 758 if ((entry->ae_perm & ACL_WRITE_DATA) && 759 ((seen & S_IWUSR) == 0)) { 760 seen |= S_IWUSR; 761 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 762 mode |= S_IWUSR; 763 } 764 if ((entry->ae_perm & ACL_EXECUTE) && 765 ((seen & S_IXUSR) == 0)) { 766 seen |= S_IXUSR; 767 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 768 mode |= S_IXUSR; 769 } 770 } else if (entry->ae_tag == ACL_GROUP_OBJ) { 771 if ((entry->ae_perm & ACL_READ_DATA) && 772 ((seen & S_IRGRP) == 0)) { 773 seen |= S_IRGRP; 774 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 775 mode |= S_IRGRP; 776 } 777 if ((entry->ae_perm & ACL_WRITE_DATA) && 778 ((seen & S_IWGRP) == 0)) { 779 seen |= S_IWGRP; 780 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 781 mode |= S_IWGRP; 782 } 783 if ((entry->ae_perm & ACL_EXECUTE) && 784 ((seen & S_IXGRP) == 0)) { 785 seen |= S_IXGRP; 786 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 787 mode |= S_IXGRP; 788 } 789 } else if (entry->ae_tag == ACL_EVERYONE) { 790 if (entry->ae_perm & ACL_READ_DATA) { 791 if ((seen & S_IRUSR) == 0) { 792 seen |= S_IRUSR; 793 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 794 mode |= S_IRUSR; 795 } 796 if ((seen & S_IRGRP) == 0) { 797 seen |= S_IRGRP; 798 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 799 mode |= S_IRGRP; 800 } 801 if ((seen & S_IROTH) == 0) { 802 seen |= S_IROTH; 803 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 804 mode |= S_IROTH; 805 } 806 } 807 if (entry->ae_perm & ACL_WRITE_DATA) { 808 if ((seen & S_IWUSR) == 0) { 809 seen |= S_IWUSR; 810 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 811 mode |= S_IWUSR; 812 } 813 if ((seen & S_IWGRP) == 0) { 814 seen |= S_IWGRP; 815 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 816 mode |= S_IWGRP; 817 } 818 if ((seen & S_IWOTH) == 0) { 819 seen |= S_IWOTH; 820 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 821 mode |= S_IWOTH; 822 } 823 } 824 if (entry->ae_perm & ACL_EXECUTE) { 825 if ((seen & S_IXUSR) == 0) { 826 seen |= S_IXUSR; 827 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 828 mode |= S_IXUSR; 829 } 830 if ((seen & S_IXGRP) == 0) { 831 seen |= S_IXGRP; 832 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 833 mode |= S_IXGRP; 834 } 835 if ((seen & S_IXOTH) == 0) { 836 seen |= S_IXOTH; 837 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 838 mode |= S_IXOTH; 839 } 840 } 841 } 842 } 843 844 *_mode = mode | (old_mode & ACL_PRESERVE_MASK); 845 } 846 847 #ifdef _KERNEL 848 /* 849 * Calculate inherited ACL in a manner compatible with NFSv4 Minor Version 1, 850 * draft-ietf-nfsv4-minorversion1-03.txt. 851 */ 852 static void 853 acl_nfs4_compute_inherited_acl_draft(const struct acl *parent_aclp, 854 struct acl *child_aclp, mode_t mode, int file_owner_id, 855 int is_directory) 856 { 857 int i, flags; 858 const struct acl_entry *parent_entry; 859 struct acl_entry *entry, *copy; 860 861 KASSERT(child_aclp->acl_cnt == 0, ("child_aclp->acl_cnt == 0")); 862 KASSERT(parent_aclp->acl_cnt <= ACL_MAX_ENTRIES, 863 ("parent_aclp->acl_cnt <= ACL_MAX_ENTRIES")); 864 865 /* 866 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 867 * 868 * 3.16.6.2. Applying the mode given to CREATE or OPEN 869 * to an inherited ACL 870 */ 871 872 /* 873 * 1. Form an ACL that is the concatenation of all inheritable ACEs. 874 */ 875 for (i = 0; i < parent_aclp->acl_cnt; i++) { 876 parent_entry = &(parent_aclp->acl_entry[i]); 877 flags = parent_entry->ae_flags; 878 879 /* 880 * Entry is not inheritable at all. 881 */ 882 if ((flags & (ACL_ENTRY_DIRECTORY_INHERIT | 883 ACL_ENTRY_FILE_INHERIT)) == 0) 884 continue; 885 886 /* 887 * We're creating a file, but entry is not inheritable 888 * by files. 889 */ 890 if (!is_directory && (flags & ACL_ENTRY_FILE_INHERIT) == 0) 891 continue; 892 893 /* 894 * Entry is inheritable only by files, but has NO_PROPAGATE 895 * flag set, and we're creating a directory, so it wouldn't 896 * propagate to any file in that directory anyway. 897 */ 898 if (is_directory && 899 (flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0 && 900 (flags & ACL_ENTRY_NO_PROPAGATE_INHERIT)) 901 continue; 902 903 KASSERT(child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 904 ("child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 905 child_aclp->acl_entry[child_aclp->acl_cnt] = *parent_entry; 906 child_aclp->acl_cnt++; 907 } 908 909 /* 910 * 2. For each entry in the new ACL, adjust its flags, possibly 911 * creating two entries in place of one. 912 */ 913 for (i = 0; i < child_aclp->acl_cnt; i++) { 914 entry = &(child_aclp->acl_entry[i]); 915 916 /* 917 * This is not in the specification, but SunOS 918 * apparently does that. 919 */ 920 if (((entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT) || 921 !is_directory) && 922 entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 923 entry->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER); 924 925 /* 926 * 2.A. If the ACL_ENTRY_NO_PROPAGATE_INHERIT is set, or if the object 927 * being created is not a directory, then clear the 928 * following flags: ACL_ENTRY_NO_PROPAGATE_INHERIT, 929 * ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT, 930 * ACL_ENTRY_INHERIT_ONLY. 931 */ 932 if (entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT || 933 !is_directory) { 934 entry->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 935 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 936 ACL_ENTRY_INHERIT_ONLY); 937 938 /* 939 * Continue on to the next ACE. 940 */ 941 continue; 942 } 943 944 /* 945 * 2.B. If the object is a directory and ACL_ENTRY_FILE_INHERIT 946 * is set, but ACL_ENTRY_NO_PROPAGATE_INHERIT is not set, ensure 947 * that ACL_ENTRY_INHERIT_ONLY is set. Continue to the 948 * next ACE. Otherwise... 949 */ 950 /* 951 * XXX: Read it again and make sure what does the "otherwise" 952 * apply to. 953 */ 954 if (is_directory && 955 (entry->ae_flags & ACL_ENTRY_FILE_INHERIT) && 956 ((entry->ae_flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0)) { 957 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 958 continue; 959 } 960 961 /* 962 * 2.C. If the type of the ACE is neither ALLOW nor deny, 963 * then continue. 964 */ 965 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 966 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 967 continue; 968 969 /* 970 * 2.D. Copy the original ACE into a second, adjacent ACE. 971 */ 972 copy = _acl_duplicate_entry(child_aclp, i); 973 974 /* 975 * 2.E. On the first ACE, ensure that ACL_ENTRY_INHERIT_ONLY 976 * is set. 977 */ 978 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 979 980 /* 981 * 2.F. On the second ACE, clear the following flags: 982 * ACL_ENTRY_NO_PROPAGATE_INHERIT, ACL_ENTRY_FILE_INHERIT, 983 * ACL_ENTRY_DIRECTORY_INHERIT, ACL_ENTRY_INHERIT_ONLY. 984 */ 985 copy->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 986 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 987 ACL_ENTRY_INHERIT_ONLY); 988 989 /* 990 * 2.G. On the second ACE, if the type is ALLOW, 991 * an implementation MAY clear the following 992 * mask bits: ACL_WRITE_ACL, ACL_WRITE_OWNER. 993 */ 994 if (copy->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 995 copy->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER); 996 997 /* 998 * Increment the counter to skip the copied entry. 999 */ 1000 i++; 1001 } 1002 1003 /* 1004 * 3. To ensure that the mode is honored, apply the algorithm describe 1005 * in Section 2.16.6.3, using the mode that is to be used for file 1006 * creation. 1007 */ 1008 acl_nfs4_sync_acl_from_mode(child_aclp, mode, file_owner_id); 1009 } 1010 #endif /* _KERNEL */ 1011 1012 /* 1013 * Populate the ACL with entries inherited from parent_aclp. 1014 */ 1015 static void 1016 acl_nfs4_inherit_entries(const struct acl *parent_aclp, 1017 struct acl *child_aclp, mode_t mode, int file_owner_id, 1018 int is_directory) 1019 { 1020 int i, flags, tag; 1021 const struct acl_entry *parent_entry; 1022 struct acl_entry *entry; 1023 1024 KASSERT(parent_aclp->acl_cnt <= ACL_MAX_ENTRIES, 1025 ("parent_aclp->acl_cnt <= ACL_MAX_ENTRIES")); 1026 1027 for (i = 0; i < parent_aclp->acl_cnt; i++) { 1028 parent_entry = &(parent_aclp->acl_entry[i]); 1029 flags = parent_entry->ae_flags; 1030 tag = parent_entry->ae_tag; 1031 1032 /* 1033 * Don't inherit owner@, group@, or everyone@ entries. 1034 */ 1035 if (tag == ACL_USER_OBJ || tag == ACL_GROUP_OBJ || 1036 tag == ACL_EVERYONE) 1037 continue; 1038 1039 /* 1040 * Entry is not inheritable at all. 1041 */ 1042 if ((flags & (ACL_ENTRY_DIRECTORY_INHERIT | 1043 ACL_ENTRY_FILE_INHERIT)) == 0) 1044 continue; 1045 1046 /* 1047 * We're creating a file, but entry is not inheritable 1048 * by files. 1049 */ 1050 if (!is_directory && (flags & ACL_ENTRY_FILE_INHERIT) == 0) 1051 continue; 1052 1053 /* 1054 * Entry is inheritable only by files, but has NO_PROPAGATE 1055 * flag set, and we're creating a directory, so it wouldn't 1056 * propagate to any file in that directory anyway. 1057 */ 1058 if (is_directory && 1059 (flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0 && 1060 (flags & ACL_ENTRY_NO_PROPAGATE_INHERIT)) 1061 continue; 1062 1063 /* 1064 * Entry qualifies for being inherited. 1065 */ 1066 KASSERT(child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 1067 ("child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 1068 entry = &(child_aclp->acl_entry[child_aclp->acl_cnt]); 1069 *entry = *parent_entry; 1070 child_aclp->acl_cnt++; 1071 1072 entry->ae_flags &= ~ACL_ENTRY_INHERIT_ONLY; 1073 entry->ae_flags |= ACL_ENTRY_INHERITED; 1074 1075 /* 1076 * If the type of the ACE is neither ALLOW nor DENY, 1077 * then leave it as it is and proceed to the next one. 1078 */ 1079 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 1080 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 1081 continue; 1082 1083 /* 1084 * If the ACL_ENTRY_NO_PROPAGATE_INHERIT is set, or if 1085 * the object being created is not a directory, then clear 1086 * the following flags: ACL_ENTRY_NO_PROPAGATE_INHERIT, 1087 * ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT, 1088 * ACL_ENTRY_INHERIT_ONLY. 1089 */ 1090 if (entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT || 1091 !is_directory) { 1092 entry->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 1093 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 1094 ACL_ENTRY_INHERIT_ONLY); 1095 } 1096 1097 /* 1098 * If the object is a directory and ACL_ENTRY_FILE_INHERIT 1099 * is set, but ACL_ENTRY_DIRECTORY_INHERIT is not set, ensure 1100 * that ACL_ENTRY_INHERIT_ONLY is set. 1101 */ 1102 if (is_directory && 1103 (entry->ae_flags & ACL_ENTRY_FILE_INHERIT) && 1104 ((entry->ae_flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0)) { 1105 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 1106 } 1107 1108 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW && 1109 (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) == 0) { 1110 /* 1111 * Some permissions must never be inherited. 1112 */ 1113 entry->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER | 1114 ACL_WRITE_NAMED_ATTRS | ACL_WRITE_ATTRIBUTES); 1115 1116 /* 1117 * Others must be masked according to the file mode. 1118 */ 1119 if ((mode & S_IRGRP) == 0) 1120 entry->ae_perm &= ~ACL_READ_DATA; 1121 if ((mode & S_IWGRP) == 0) 1122 entry->ae_perm &= 1123 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 1124 if ((mode & S_IXGRP) == 0) 1125 entry->ae_perm &= ~ACL_EXECUTE; 1126 } 1127 } 1128 } 1129 1130 /* 1131 * Calculate inherited ACL in a manner compatible with PSARC/2010/029. 1132 * It's also being used to calculate a trivial ACL, by inheriting from 1133 * a NULL ACL. 1134 */ 1135 static void 1136 acl_nfs4_compute_inherited_acl_psarc(const struct acl *parent_aclp, 1137 struct acl *aclp, mode_t mode, int file_owner_id, int is_directory) 1138 { 1139 acl_perm_t user_allow_first = 0, user_deny = 0, group_deny = 0; 1140 acl_perm_t user_allow, group_allow, everyone_allow; 1141 1142 KASSERT(aclp->acl_cnt == 0, ("aclp->acl_cnt == 0")); 1143 1144 user_allow = group_allow = everyone_allow = ACL_READ_ACL | 1145 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | ACL_SYNCHRONIZE; 1146 user_allow |= ACL_WRITE_ACL | ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 1147 ACL_WRITE_NAMED_ATTRS; 1148 1149 if (mode & S_IRUSR) 1150 user_allow |= ACL_READ_DATA; 1151 if (mode & S_IWUSR) 1152 user_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 1153 if (mode & S_IXUSR) 1154 user_allow |= ACL_EXECUTE; 1155 1156 if (mode & S_IRGRP) 1157 group_allow |= ACL_READ_DATA; 1158 if (mode & S_IWGRP) 1159 group_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 1160 if (mode & S_IXGRP) 1161 group_allow |= ACL_EXECUTE; 1162 1163 if (mode & S_IROTH) 1164 everyone_allow |= ACL_READ_DATA; 1165 if (mode & S_IWOTH) 1166 everyone_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 1167 if (mode & S_IXOTH) 1168 everyone_allow |= ACL_EXECUTE; 1169 1170 user_deny = ((group_allow | everyone_allow) & ~user_allow); 1171 group_deny = everyone_allow & ~group_allow; 1172 user_allow_first = group_deny & ~user_deny; 1173 1174 if (user_allow_first != 0) 1175 _acl_append(aclp, ACL_USER_OBJ, user_allow_first, 1176 ACL_ENTRY_TYPE_ALLOW); 1177 if (user_deny != 0) 1178 _acl_append(aclp, ACL_USER_OBJ, user_deny, 1179 ACL_ENTRY_TYPE_DENY); 1180 if (group_deny != 0) 1181 _acl_append(aclp, ACL_GROUP_OBJ, group_deny, 1182 ACL_ENTRY_TYPE_DENY); 1183 1184 if (parent_aclp != NULL) 1185 acl_nfs4_inherit_entries(parent_aclp, aclp, mode, 1186 file_owner_id, is_directory); 1187 1188 _acl_append(aclp, ACL_USER_OBJ, user_allow, ACL_ENTRY_TYPE_ALLOW); 1189 _acl_append(aclp, ACL_GROUP_OBJ, group_allow, ACL_ENTRY_TYPE_ALLOW); 1190 _acl_append(aclp, ACL_EVERYONE, everyone_allow, ACL_ENTRY_TYPE_ALLOW); 1191 } 1192 1193 #ifdef _KERNEL 1194 void 1195 acl_nfs4_compute_inherited_acl(const struct acl *parent_aclp, 1196 struct acl *child_aclp, mode_t mode, int file_owner_id, 1197 int is_directory) 1198 { 1199 1200 if (acl_nfs4_old_semantics) 1201 acl_nfs4_compute_inherited_acl_draft(parent_aclp, child_aclp, 1202 mode, file_owner_id, is_directory); 1203 else 1204 acl_nfs4_compute_inherited_acl_psarc(parent_aclp, child_aclp, 1205 mode, file_owner_id, is_directory); 1206 } 1207 #endif /* _KERNEL */ 1208 1209 /* 1210 * Calculate trivial ACL in a manner compatible with PSARC/2010/029. 1211 * Note that this results in an ACL different from (but semantically 1212 * equal to) the "canonical six" trivial ACL computed using algorithm 1213 * described in draft-ietf-nfsv4-minorversion1-03.txt, 3.16.6.2. 1214 */ 1215 static void 1216 acl_nfs4_trivial_from_mode(struct acl *aclp, mode_t mode) 1217 { 1218 1219 aclp->acl_cnt = 0; 1220 acl_nfs4_compute_inherited_acl_psarc(NULL, aclp, mode, -1, -1); 1221 } 1222 1223 #ifndef _KERNEL 1224 /* 1225 * This routine is used by libc to implement acl_strip_np(3) 1226 * and acl_is_trivial_np(3). 1227 */ 1228 void 1229 acl_nfs4_trivial_from_mode_libc(struct acl *aclp, int mode, int canonical_six) 1230 { 1231 1232 aclp->acl_cnt = 0; 1233 if (canonical_six) 1234 acl_nfs4_sync_acl_from_mode_draft(aclp, mode, -1); 1235 else 1236 acl_nfs4_trivial_from_mode(aclp, mode); 1237 } 1238 #endif /* !_KERNEL */ 1239 1240 #ifdef _KERNEL 1241 static int 1242 _acls_are_equal(const struct acl *a, const struct acl *b) 1243 { 1244 int i; 1245 const struct acl_entry *entrya, *entryb; 1246 1247 if (a->acl_cnt != b->acl_cnt) 1248 return (0); 1249 1250 for (i = 0; i < b->acl_cnt; i++) { 1251 entrya = &(a->acl_entry[i]); 1252 entryb = &(b->acl_entry[i]); 1253 1254 if (entrya->ae_tag != entryb->ae_tag || 1255 entrya->ae_id != entryb->ae_id || 1256 entrya->ae_perm != entryb->ae_perm || 1257 entrya->ae_entry_type != entryb->ae_entry_type || 1258 entrya->ae_flags != entryb->ae_flags) 1259 return (0); 1260 } 1261 1262 return (1); 1263 } 1264 1265 /* 1266 * This routine is used to determine whether to remove extended attribute 1267 * that stores ACL contents. 1268 */ 1269 int 1270 acl_nfs4_is_trivial(const struct acl *aclp, int file_owner_id) 1271 { 1272 int trivial; 1273 mode_t tmpmode = 0; 1274 struct acl *tmpaclp; 1275 1276 if (aclp->acl_cnt > 6) 1277 return (0); 1278 1279 /* 1280 * Compute the mode from the ACL, then compute new ACL from that mode. 1281 * If the ACLs are identical, then the ACL is trivial. 1282 * 1283 * XXX: I guess there is a faster way to do this. However, even 1284 * this slow implementation significantly speeds things up 1285 * for files that don't have non-trivial ACLs - it's critical 1286 * for performance to not use EA when they are not needed. 1287 * 1288 * First try the PSARC/2010/029 semantics. 1289 */ 1290 tmpaclp = acl_alloc(M_WAITOK | M_ZERO); 1291 acl_nfs4_sync_mode_from_acl(&tmpmode, aclp); 1292 acl_nfs4_trivial_from_mode(tmpaclp, tmpmode); 1293 trivial = _acls_are_equal(aclp, tmpaclp); 1294 if (trivial) { 1295 acl_free(tmpaclp); 1296 return (trivial); 1297 } 1298 1299 /* 1300 * Check if it's a draft-ietf-nfsv4-minorversion1-03.txt trivial ACL. 1301 */ 1302 tmpaclp->acl_cnt = 0; 1303 acl_nfs4_sync_acl_from_mode_draft(tmpaclp, tmpmode, file_owner_id); 1304 trivial = _acls_are_equal(aclp, tmpaclp); 1305 acl_free(tmpaclp); 1306 1307 return (trivial); 1308 } 1309 #endif /* _KERNEL */ 1310 1311 int 1312 acl_nfs4_check(const struct acl *aclp, int is_directory) 1313 { 1314 int i; 1315 const struct acl_entry *entry; 1316 1317 /* 1318 * The spec doesn't seem to say anything about ACL validity. 1319 * It seems there is not much to do here. There is even no need 1320 * to count "owner@" or "everyone@" (ACL_USER_OBJ and ACL_EVERYONE) 1321 * entries, as there can be several of them and that's perfectly 1322 * valid. There can be none of them too. Really. 1323 */ 1324 1325 if (aclp->acl_cnt > ACL_MAX_ENTRIES || aclp->acl_cnt <= 0) 1326 return (EINVAL); 1327 1328 for (i = 0; i < aclp->acl_cnt; i++) { 1329 entry = &(aclp->acl_entry[i]); 1330 1331 switch (entry->ae_tag) { 1332 case ACL_USER_OBJ: 1333 case ACL_GROUP_OBJ: 1334 case ACL_EVERYONE: 1335 if (entry->ae_id != ACL_UNDEFINED_ID) 1336 return (EINVAL); 1337 break; 1338 1339 case ACL_USER: 1340 case ACL_GROUP: 1341 if (entry->ae_id == ACL_UNDEFINED_ID) 1342 return (EINVAL); 1343 break; 1344 1345 default: 1346 return (EINVAL); 1347 } 1348 1349 if ((entry->ae_perm | ACL_NFS4_PERM_BITS) != ACL_NFS4_PERM_BITS) 1350 return (EINVAL); 1351 1352 /* 1353 * Disallow ACL_ENTRY_TYPE_AUDIT and ACL_ENTRY_TYPE_ALARM for now. 1354 */ 1355 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 1356 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 1357 return (EINVAL); 1358 1359 if ((entry->ae_flags | ACL_FLAGS_BITS) != ACL_FLAGS_BITS) 1360 return (EINVAL); 1361 1362 /* Disallow unimplemented flags. */ 1363 if (entry->ae_flags & (ACL_ENTRY_SUCCESSFUL_ACCESS | 1364 ACL_ENTRY_FAILED_ACCESS)) 1365 return (EINVAL); 1366 1367 /* Disallow flags not allowed for ordinary files. */ 1368 if (!is_directory) { 1369 if (entry->ae_flags & (ACL_ENTRY_FILE_INHERIT | 1370 ACL_ENTRY_DIRECTORY_INHERIT | 1371 ACL_ENTRY_NO_PROPAGATE_INHERIT | ACL_ENTRY_INHERIT_ONLY)) 1372 return (EINVAL); 1373 } 1374 } 1375 1376 return (0); 1377 } 1378 1379 #ifdef _KERNEL 1380 static int 1381 acl_nfs4_modload(module_t module, int what, void *arg) 1382 { 1383 int ret; 1384 1385 ret = 0; 1386 1387 switch (what) { 1388 case MOD_LOAD: 1389 case MOD_SHUTDOWN: 1390 break; 1391 1392 case MOD_QUIESCE: 1393 /* XXX TODO */ 1394 ret = 0; 1395 break; 1396 1397 case MOD_UNLOAD: 1398 /* XXX TODO */ 1399 ret = 0; 1400 break; 1401 default: 1402 ret = EINVAL; 1403 break; 1404 } 1405 1406 return (ret); 1407 } 1408 1409 static moduledata_t acl_nfs4_mod = { 1410 "acl_nfs4", 1411 acl_nfs4_modload, 1412 NULL 1413 }; 1414 1415 /* 1416 * XXX TODO: which subsystem, order? 1417 */ 1418 DECLARE_MODULE(acl_nfs4, acl_nfs4_mod, SI_SUB_VFS, SI_ORDER_FIRST); 1419 MODULE_VERSION(acl_nfs4, 1); 1420 #endif /* _KERNEL */
Cache object: ef8cfc9f05bd22270c0365e33e368f8b
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