1 /*- 2 * Copyright (c) 1999, 2000, 2001 Robert N. M. Watson 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 * $FreeBSD$ 27 */ 28 /* 29 * Developed by the TrustedBSD Project. 30 * Support for POSIX.1e access control lists. 31 */ 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/sysproto.h> 36 #include <sys/kernel.h> 37 #include <sys/malloc.h> 38 #include <sys/vnode.h> 39 #include <sys/lock.h> 40 #include <sys/namei.h> 41 #include <sys/file.h> 42 #include <sys/proc.h> 43 #include <sys/sysent.h> 44 #include <sys/errno.h> 45 #include <sys/stat.h> 46 #include <sys/acl.h> 47 48 MALLOC_DEFINE(M_ACL, "acl", "access control list"); 49 50 static int vacl_set_acl(struct proc *p, struct vnode *vp, acl_type_t type, 51 struct acl *aclp); 52 static int vacl_get_acl(struct proc *p, struct vnode *vp, acl_type_t type, 53 struct acl *aclp); 54 static int vacl_aclcheck(struct proc *p, struct vnode *vp, 55 acl_type_t type, struct acl *aclp); 56 57 /* 58 * Implement a version of vaccess() that understands POSIX.1e ACL semantics. 59 * Return 0 on success, else an errno value. Should be merged into 60 * vaccess() eventually. 61 */ 62 int 63 vaccess_acl_posix1e(enum vtype type, uid_t file_uid, gid_t file_gid, 64 struct acl *acl, mode_t acc_mode, struct ucred *cred, int *privused) 65 { 66 struct acl_entry *acl_other, *acl_mask; 67 mode_t dac_granted; 68 mode_t cap_granted; 69 mode_t acl_mask_granted; 70 int group_matched, i; 71 72 /* 73 * Look for a normal, non-privileged way to access the file/directory 74 * as requested. If it exists, go with that. Otherwise, attempt 75 * to use privileges granted via cap_granted. In some cases, 76 * which privileges to use may be ambiguous due to "best match", 77 * in which case fall back on first match for the time being. 78 */ 79 if (privused != NULL) 80 *privused = 0; 81 82 /* 83 * Determine privileges now, but don't apply until we've found 84 * a DAC match that has failed to allow access. 85 */ 86 #ifndef CAPABILITIES 87 if (suser_xxx(cred, NULL, PRISON_ROOT) == 0) 88 cap_granted = (VEXEC | VREAD | VWRITE | VADMIN); 89 else 90 cap_granted = 0; 91 #else 92 cap_granted = 0; 93 94 if (type == VDIR) { 95 if ((acc_mode & VEXEC) && !cap_check(cred, NULL, 96 CAP_DAC_READ_SEARCH, PRISON_ROOT)) 97 cap_granted |= VEXEC; 98 } else { 99 if ((acc_mode & VEXEC) && !cap_check(cred, NULL, 100 CAP_DAC_EXECUTE, PRISON_ROOT)) 101 cap_granted |= VEXEC; 102 } 103 104 if ((acc_mode & VREAD) && !cap_check(cred, NULL, CAP_DAC_READ_SEARCH, 105 PRISON_ROOT)) 106 cap_granted |= VREAD; 107 108 if ((acc_mode & VWRITE) && !cap_check(cred, NULL, CAP_DAC_WRITE, 109 PRISON_ROOT)) 110 cap_granted |= VWRITE; 111 112 if ((acc_mode & VADMIN) && !cap_check(cred, NULL, CAP_FOWNER, 113 PRISON_ROOT)) 114 cap_granted |= VADMIN; 115 #endif /* CAPABILITIES */ 116 117 /* 118 * Check the owner. 119 * Also, record locations of ACL_MASK and ACL_OTHER for reference 120 * later if the owner doesn't match. 121 */ 122 acl_mask = acl_other = NULL; 123 for (i = 0; i < acl->acl_cnt; i++) { 124 switch (acl->acl_entry[i].ae_tag) { 125 case ACL_USER_OBJ: 126 if (file_uid != cred->cr_uid) 127 break; 128 dac_granted = 0; 129 dac_granted |= VADMIN; 130 if (acl->acl_entry[i].ae_perm & ACL_EXECUTE) 131 dac_granted |= VEXEC; 132 if (acl->acl_entry[i].ae_perm & ACL_READ) 133 dac_granted |= VREAD; 134 if (acl->acl_entry[i].ae_perm & ACL_WRITE) 135 dac_granted |= VWRITE; 136 if ((acc_mode & dac_granted) == acc_mode) 137 return (0); 138 if ((acc_mode & (dac_granted | cap_granted)) == 139 acc_mode) { 140 if (privused != NULL) 141 *privused = 1; 142 return (0); 143 } 144 goto error; 145 146 case ACL_MASK: 147 acl_mask = &acl->acl_entry[i]; 148 break; 149 150 case ACL_OTHER: 151 acl_other = &acl->acl_entry[i]; 152 break; 153 154 default: 155 } 156 } 157 158 /* 159 * Checks against ACL_USER, ACL_GROUP_OBJ, and ACL_GROUP fields 160 * are masked by an ACL_MASK entry, if any. As such, first identify 161 * the ACL_MASK field, then iterate through identifying potential 162 * user matches, then group matches. If there is no ACL_MASK, 163 * assume that the mask allows all requests to succeed. 164 * Also keep track of the location of ACL_OTHER for later consumption. 165 */ 166 if (acl_other == NULL) { 167 /* 168 * XXX: This should never happen. Only properly formatted 169 * ACLs should be passed to vaccess_acl_posix1e. 170 * Should make this a panic post-debugging. 171 */ 172 printf("vaccess_acl_posix1e: ACL_OTHER missing\n"); 173 return (EPERM); 174 } 175 if (acl_mask != NULL) { 176 acl_mask_granted = 0; 177 if (acl_mask->ae_perm & ACL_EXECUTE) 178 acl_mask_granted |= VEXEC; 179 if (acl_mask->ae_perm & ACL_READ) 180 acl_mask_granted |= VREAD; 181 if (acl_mask->ae_perm & ACL_WRITE) 182 acl_mask_granted |= VWRITE; 183 } else 184 acl_mask_granted = VEXEC | VREAD | VWRITE; 185 186 /* 187 * We have to check each type even if we know ACL_MASK will reject, 188 * as we need to know what match there might have been, and 189 * therefore what further types we might be allowed to check. 190 * Do the checks twice -- once without privilege, and a second time 191 * with, if there was a match. 192 */ 193 194 /* 195 * Check ACL_USER ACL entries. 196 */ 197 for (i = 0; i < acl->acl_cnt; i++) { 198 switch (acl->acl_entry[i].ae_tag) { 199 case ACL_USER: 200 if (acl->acl_entry[i].ae_id != cred->cr_uid) 201 break; 202 dac_granted = 0; 203 if (acl->acl_entry[i].ae_perm & ACL_EXECUTE) 204 dac_granted |= VEXEC; 205 if (acl->acl_entry[i].ae_perm & ACL_READ) 206 dac_granted |= VREAD; 207 if (acl->acl_entry[i].ae_perm & ACL_WRITE) 208 dac_granted |= VWRITE; 209 dac_granted &= acl_mask_granted; 210 if ((acc_mode & dac_granted) == acc_mode) 211 return (0); 212 if ((acc_mode & (dac_granted | cap_granted)) != 213 acc_mode) 214 goto error; 215 216 if (privused != NULL) 217 *privused = 1; 218 return (0); 219 } 220 } 221 222 /* 223 * Group match is best-match, not first-match, so find a 224 * "best" match. Iterate across, testing each potential group 225 * match. Make sure we keep track of whether we found a match 226 * or not, so that we know if we can move on to ACL_OTHER. 227 */ 228 group_matched = 0; 229 for (i = 0; i < acl->acl_cnt; i++) { 230 switch (acl->acl_entry[i].ae_tag) { 231 case ACL_GROUP_OBJ: 232 if (!groupmember(file_gid, cred)) 233 break; 234 dac_granted = 0; 235 if (acl->acl_entry[i].ae_perm & ACL_EXECUTE) 236 dac_granted |= VEXEC; 237 if (acl->acl_entry[i].ae_perm & ACL_READ) 238 dac_granted |= VREAD; 239 if (acl->acl_entry[i].ae_perm & ACL_WRITE) 240 dac_granted |= VWRITE; 241 dac_granted &= acl_mask_granted; 242 243 if ((acc_mode & dac_granted) == acc_mode) 244 return (0); 245 246 group_matched = 1; 247 break; 248 249 case ACL_GROUP: 250 if (!groupmember(acl->acl_entry[i].ae_id, cred)) 251 break; 252 dac_granted = 0; 253 if (acl->acl_entry[i].ae_perm & ACL_EXECUTE) 254 dac_granted |= VEXEC; 255 if (acl->acl_entry[i].ae_perm & ACL_READ) 256 dac_granted |= VREAD; 257 if (acl->acl_entry[i].ae_perm & ACL_WRITE) 258 dac_granted |= VWRITE; 259 dac_granted &= acl_mask_granted; 260 261 if ((acc_mode & dac_granted) == acc_mode) 262 return (0); 263 264 group_matched = 1; 265 break; 266 267 default: 268 } 269 } 270 271 if (group_matched == 1) { 272 /* 273 * There was a match, but it did not grant rights via 274 * pure DAC. Try again, this time with privilege. 275 */ 276 for (i = 0; i < acl->acl_cnt; i++) { 277 switch (acl->acl_entry[i].ae_tag) { 278 case ACL_GROUP_OBJ: 279 if (!groupmember(file_gid, cred)) 280 break; 281 dac_granted = 0; 282 if (acl->acl_entry[i].ae_perm & ACL_EXECUTE) 283 dac_granted |= VEXEC; 284 if (acl->acl_entry[i].ae_perm & ACL_READ) 285 dac_granted |= VREAD; 286 if (acl->acl_entry[i].ae_perm & ACL_WRITE) 287 dac_granted |= VWRITE; 288 dac_granted &= acl_mask_granted; 289 290 if ((acc_mode & (dac_granted | cap_granted)) != 291 acc_mode) 292 break; 293 294 if (privused != NULL) 295 *privused = 1; 296 return (0); 297 298 case ACL_GROUP: 299 if (!groupmember(acl->acl_entry[i].ae_id, 300 cred)) 301 break; 302 dac_granted = 0; 303 if (acl->acl_entry[i].ae_perm & ACL_EXECUTE) 304 dac_granted |= VEXEC; 305 if (acl->acl_entry[i].ae_perm & ACL_READ) 306 dac_granted |= VREAD; 307 if (acl->acl_entry[i].ae_perm & ACL_WRITE) 308 dac_granted |= VWRITE; 309 dac_granted &= acl_mask_granted; 310 311 if ((acc_mode & (dac_granted | cap_granted)) != 312 acc_mode) 313 break; 314 315 if (privused != NULL) 316 *privused = 1; 317 return (0); 318 319 default: 320 } 321 } 322 /* 323 * Even with privilege, group membership was not sufficient. 324 * Return failure. 325 */ 326 goto error; 327 } 328 329 /* 330 * Fall back on ACL_OTHER. ACL_MASK is not applied to ACL_OTHER. 331 */ 332 dac_granted = 0; 333 if (acl_other->ae_perm & ACL_EXECUTE) 334 dac_granted |= VEXEC; 335 if (acl_other->ae_perm & ACL_READ) 336 dac_granted |= VREAD; 337 if (acl_other->ae_perm & ACL_WRITE) 338 dac_granted |= VWRITE; 339 340 if ((acc_mode & dac_granted) == acc_mode) 341 return (0); 342 if ((acc_mode & (dac_granted | cap_granted)) == acc_mode) { 343 if (privused != NULL) 344 *privused = 1; 345 return (0); 346 } 347 348 error: 349 return ((acc_mode & VADMIN) ? EPERM : EACCES); 350 } 351 352 /* 353 * For the purposes of file systems maintaining the _OBJ entries in an 354 * inode with a mode_t field, this routine converts a mode_t entry 355 * to an acl_perm_t. 356 */ 357 acl_perm_t 358 acl_posix1e_mode_to_perm(acl_tag_t tag, mode_t mode) 359 { 360 acl_perm_t perm = 0; 361 362 switch(tag) { 363 case ACL_USER_OBJ: 364 if (mode & S_IXUSR) 365 perm |= ACL_EXECUTE; 366 if (mode & S_IRUSR) 367 perm |= ACL_READ; 368 if (mode & S_IWUSR) 369 perm |= ACL_WRITE; 370 return (perm); 371 372 case ACL_GROUP_OBJ: 373 if (mode & S_IXGRP) 374 perm |= ACL_EXECUTE; 375 if (mode & S_IRGRP) 376 perm |= ACL_READ; 377 if (mode & S_IWGRP) 378 perm |= ACL_WRITE; 379 return (perm); 380 381 case ACL_OTHER: 382 if (mode & S_IXOTH) 383 perm |= ACL_EXECUTE; 384 if (mode & S_IROTH) 385 perm |= ACL_READ; 386 if (mode & S_IWOTH) 387 perm |= ACL_WRITE; 388 return (perm); 389 390 default: 391 printf("acl_posix1e_mode_to_perm: invalid tag (%d)\n", tag); 392 return (0); 393 } 394 } 395 396 /* 397 * Given inode information (uid, gid, mode), return an acl entry of the 398 * appropriate type. 399 */ 400 struct acl_entry 401 acl_posix1e_mode_to_entry(acl_tag_t tag, uid_t uid, gid_t gid, mode_t mode) 402 { 403 struct acl_entry acl_entry; 404 405 acl_entry.ae_tag = tag; 406 acl_entry.ae_perm = acl_posix1e_mode_to_perm(tag, mode); 407 switch(tag) { 408 case ACL_USER_OBJ: 409 acl_entry.ae_id = uid; 410 break; 411 412 case ACL_GROUP_OBJ: 413 acl_entry.ae_id = gid; 414 break; 415 416 case ACL_OTHER: 417 acl_entry.ae_id = 0; 418 break; 419 420 default: 421 acl_entry.ae_id = 0; 422 printf("acl_posix1e_mode_to_entry: invalid tag (%d)\n", tag); 423 } 424 425 return (acl_entry); 426 } 427 428 /* 429 * Utility function to generate a file mode given appropriate ACL entries. 430 */ 431 mode_t 432 acl_posix1e_perms_to_mode(struct acl_entry *acl_user_obj_entry, 433 struct acl_entry *acl_group_obj_entry, struct acl_entry *acl_other_entry) 434 { 435 mode_t mode; 436 437 mode = 0; 438 if (acl_user_obj_entry->ae_perm & ACL_EXECUTE) 439 mode |= S_IXUSR; 440 if (acl_user_obj_entry->ae_perm & ACL_READ) 441 mode |= S_IRUSR; 442 if (acl_user_obj_entry->ae_perm & ACL_WRITE) 443 mode |= S_IWUSR; 444 if (acl_group_obj_entry->ae_perm & ACL_EXECUTE) 445 mode |= S_IXGRP; 446 if (acl_group_obj_entry->ae_perm & ACL_READ) 447 mode |= S_IRGRP; 448 if (acl_group_obj_entry->ae_perm & ACL_WRITE) 449 mode |= S_IWGRP; 450 if (acl_other_entry->ae_perm & ACL_EXECUTE) 451 mode |= S_IXOTH; 452 if (acl_other_entry->ae_perm & ACL_READ) 453 mode |= S_IROTH; 454 if (acl_other_entry->ae_perm & ACL_WRITE) 455 mode |= S_IWOTH; 456 457 return (mode); 458 } 459 460 /* 461 * Perform a syntactic check of the ACL, sufficient to allow an 462 * implementing file system to determine if it should accept this and 463 * rely on the POSIX.1e ACL properties. 464 */ 465 int 466 acl_posix1e_check(struct acl *acl) 467 { 468 int num_acl_user_obj, num_acl_user, num_acl_group_obj, num_acl_group; 469 int num_acl_mask, num_acl_other, i; 470 471 /* 472 * Verify that the number of entries does not exceed the maximum 473 * defined for acl_t. 474 * Verify that the correct number of various sorts of ae_tags are 475 * present: 476 * Exactly one ACL_USER_OBJ 477 * Exactly one ACL_GROUP_OBJ 478 * Exactly one ACL_OTHER 479 * If any ACL_USER or ACL_GROUP entries appear, then exactly one 480 * ACL_MASK entry must also appear. 481 * Verify that all ae_perm entries are in ACL_PERM_BITS. 482 * Verify all ae_tag entries are understood by this implementation. 483 * Note: Does not check for uniqueness of qualifier (ae_id) field. 484 */ 485 num_acl_user_obj = num_acl_user = num_acl_group_obj = num_acl_group = 486 num_acl_mask = num_acl_other = 0; 487 if (acl->acl_cnt > ACL_MAX_ENTRIES || acl->acl_cnt < 0) 488 return (EINVAL); 489 for (i = 0; i < acl->acl_cnt; i++) { 490 /* 491 * Check for a valid tag. 492 */ 493 switch(acl->acl_entry[i].ae_tag) { 494 case ACL_USER_OBJ: 495 acl->acl_entry[i].ae_id = ACL_UNDEFINED_ID; /* XXX */ 496 if (acl->acl_entry[i].ae_id != ACL_UNDEFINED_ID) 497 return (EINVAL); 498 num_acl_user_obj++; 499 break; 500 case ACL_GROUP_OBJ: 501 acl->acl_entry[i].ae_id = ACL_UNDEFINED_ID; /* XXX */ 502 if (acl->acl_entry[i].ae_id != ACL_UNDEFINED_ID) 503 return (EINVAL); 504 num_acl_group_obj++; 505 break; 506 case ACL_USER: 507 if (acl->acl_entry[i].ae_id == ACL_UNDEFINED_ID) 508 return (EINVAL); 509 num_acl_user++; 510 break; 511 case ACL_GROUP: 512 if (acl->acl_entry[i].ae_id == ACL_UNDEFINED_ID) 513 return (EINVAL); 514 num_acl_group++; 515 break; 516 case ACL_OTHER: 517 acl->acl_entry[i].ae_id = ACL_UNDEFINED_ID; /* XXX */ 518 if (acl->acl_entry[i].ae_id != ACL_UNDEFINED_ID) 519 return (EINVAL); 520 num_acl_other++; 521 break; 522 case ACL_MASK: 523 acl->acl_entry[i].ae_id = ACL_UNDEFINED_ID; /* XXX */ 524 if (acl->acl_entry[i].ae_id != ACL_UNDEFINED_ID) 525 return (EINVAL); 526 num_acl_mask++; 527 break; 528 default: 529 return (EINVAL); 530 } 531 /* 532 * Check for valid perm entries. 533 */ 534 if ((acl->acl_entry[i].ae_perm | ACL_PERM_BITS) != 535 ACL_PERM_BITS) 536 return (EINVAL); 537 } 538 if ((num_acl_user_obj != 1) || (num_acl_group_obj != 1) || 539 (num_acl_other != 1) || (num_acl_mask != 0 && num_acl_mask != 1)) 540 return (EINVAL); 541 if (((num_acl_group != 0) || (num_acl_user != 0)) && 542 (num_acl_mask != 1)) 543 return (EINVAL); 544 return (0); 545 } 546 547 /* 548 * These calls wrap the real vnode operations, and are called by the 549 * syscall code once the syscall has converted the path or file 550 * descriptor to a vnode (unlocked). The aclp pointer is assumed 551 * still to point to userland, so this should not be consumed within 552 * the kernel except by syscall code. Other code should directly 553 * invoke VOP_{SET,GET}ACL. 554 */ 555 556 /* 557 * Given a vnode, set its ACL. 558 */ 559 static int 560 vacl_set_acl(struct proc *p, struct vnode *vp, acl_type_t type, 561 struct acl *aclp) 562 { 563 struct acl inkernacl; 564 int error; 565 566 error = copyin(aclp, &inkernacl, sizeof(struct acl)); 567 if (error) 568 return(error); 569 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 570 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 571 error = VOP_SETACL(vp, type, &inkernacl, p->p_ucred, p); 572 VOP_UNLOCK(vp, 0, p); 573 return(error); 574 } 575 576 /* 577 * Given a vnode, get its ACL. 578 */ 579 static int 580 vacl_get_acl(struct proc *p, struct vnode *vp, acl_type_t type, 581 struct acl *aclp) 582 { 583 struct acl inkernelacl; 584 int error; 585 586 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 587 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 588 error = VOP_GETACL(vp, type, &inkernelacl, p->p_ucred, p); 589 VOP_UNLOCK(vp, 0, p); 590 if (error == 0) 591 error = copyout(&inkernelacl, aclp, sizeof(struct acl)); 592 return (error); 593 } 594 595 /* 596 * Given a vnode, delete its ACL. 597 */ 598 static int 599 vacl_delete(struct proc *p, struct vnode *vp, acl_type_t type) 600 { 601 int error; 602 603 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 604 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 605 error = VOP_SETACL(vp, ACL_TYPE_DEFAULT, 0, p->p_ucred, p); 606 VOP_UNLOCK(vp, 0, p); 607 return (error); 608 } 609 610 /* 611 * Given a vnode, check whether an ACL is appropriate for it 612 */ 613 static int 614 vacl_aclcheck(struct proc *p, struct vnode *vp, acl_type_t type, 615 struct acl *aclp) 616 { 617 struct acl inkernelacl; 618 int error; 619 620 error = copyin(aclp, &inkernelacl, sizeof(struct acl)); 621 if (error) 622 return(error); 623 error = VOP_ACLCHECK(vp, type, &inkernelacl, p->p_ucred, p); 624 return (error); 625 } 626 627 /* 628 * syscalls -- convert the path/fd to a vnode, and call vacl_whatever. 629 * Don't need to lock, as the vacl_ code will get/release any locks 630 * required. 631 */ 632 633 /* 634 * Given a file path, get an ACL for it 635 */ 636 int 637 __acl_get_file(struct proc *p, struct __acl_get_file_args *uap) 638 { 639 struct nameidata nd; 640 int error; 641 642 /* what flags are required here -- possible not LOCKLEAF? */ 643 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 644 error = namei(&nd); 645 if (error) 646 return(error); 647 error = vacl_get_acl(p, nd.ni_vp, SCARG(uap, type), SCARG(uap, aclp)); 648 NDFREE(&nd, 0); 649 return (error); 650 } 651 652 /* 653 * Given a file path, set an ACL for it 654 */ 655 int 656 __acl_set_file(struct proc *p, struct __acl_set_file_args *uap) 657 { 658 struct nameidata nd; 659 int error; 660 661 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 662 error = namei(&nd); 663 if (error) 664 return(error); 665 error = vacl_set_acl(p, nd.ni_vp, SCARG(uap, type), SCARG(uap, aclp)); 666 NDFREE(&nd, 0); 667 return (error); 668 } 669 670 /* 671 * Given a file descriptor, get an ACL for it 672 */ 673 int 674 __acl_get_fd(struct proc *p, struct __acl_get_fd_args *uap) 675 { 676 struct file *fp; 677 int error; 678 679 error = getvnode(p->p_fd, SCARG(uap, filedes), &fp); 680 if (error) 681 return(error); 682 return vacl_get_acl(p, (struct vnode *)fp->f_data, SCARG(uap, type), 683 SCARG(uap, aclp)); 684 } 685 686 /* 687 * Given a file descriptor, set an ACL for it 688 */ 689 int 690 __acl_set_fd(struct proc *p, struct __acl_set_fd_args *uap) 691 { 692 struct file *fp; 693 int error; 694 695 error = getvnode(p->p_fd, SCARG(uap, filedes), &fp); 696 if (error) 697 return(error); 698 return vacl_set_acl(p, (struct vnode *)fp->f_data, SCARG(uap, type), 699 SCARG(uap, aclp)); 700 } 701 702 /* 703 * Given a file path, delete an ACL from it. 704 */ 705 int 706 __acl_delete_file(struct proc *p, struct __acl_delete_file_args *uap) 707 { 708 struct nameidata nd; 709 int error; 710 711 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 712 error = namei(&nd); 713 if (error) 714 return(error); 715 error = vacl_delete(p, nd.ni_vp, SCARG(uap, type)); 716 NDFREE(&nd, 0); 717 return (error); 718 } 719 720 /* 721 * Given a file path, delete an ACL from it. 722 */ 723 int 724 __acl_delete_fd(struct proc *p, struct __acl_delete_fd_args *uap) 725 { 726 struct file *fp; 727 int error; 728 729 error = getvnode(p->p_fd, SCARG(uap, filedes), &fp); 730 if (error) 731 return(error); 732 error = vacl_delete(p, (struct vnode *)fp->f_data, SCARG(uap, type)); 733 return (error); 734 } 735 736 /* 737 * Given a file path, check an ACL for it 738 */ 739 int 740 __acl_aclcheck_file(struct proc *p, struct __acl_aclcheck_file_args *uap) 741 { 742 struct nameidata nd; 743 int error; 744 745 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 746 error = namei(&nd); 747 if (error) 748 return(error); 749 error = vacl_aclcheck(p, nd.ni_vp, SCARG(uap, type), SCARG(uap, aclp)); 750 NDFREE(&nd, 0); 751 return (error); 752 } 753 754 /* 755 * Given a file descriptor, check an ACL for it 756 */ 757 int 758 __acl_aclcheck_fd(struct proc *p, struct __acl_aclcheck_fd_args *uap) 759 { 760 struct file *fp; 761 int error; 762 763 error = getvnode(p->p_fd, SCARG(uap, filedes), &fp); 764 if (error) 765 return(error); 766 return vacl_aclcheck(p, (struct vnode *)fp->f_data, SCARG(uap, type), 767 SCARG(uap, aclp)); 768 } 769