/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. * Copyright 2011 Nexenta Systems, Inc. All rights reserved. */ #include #include #include #include #if defined(_KERNEL) #include #include #include #include #include #else #include #include #include #include #include #include #include #include #include #define ASSERT assert #endif #define ACE_POSIX_SUPPORTED_BITS (ACE_READ_DATA | \ ACE_WRITE_DATA | ACE_APPEND_DATA | ACE_EXECUTE | \ ACE_READ_ATTRIBUTES | ACE_READ_ACL | ACE_WRITE_ACL) #define ACL_SYNCHRONIZE_SET_DENY 0x0000001 #define ACL_SYNCHRONIZE_SET_ALLOW 0x0000002 #define ACL_SYNCHRONIZE_ERR_DENY 0x0000004 #define ACL_SYNCHRONIZE_ERR_ALLOW 0x0000008 #define ACL_WRITE_OWNER_SET_DENY 0x0000010 #define ACL_WRITE_OWNER_SET_ALLOW 0x0000020 #define ACL_WRITE_OWNER_ERR_DENY 0x0000040 #define ACL_WRITE_OWNER_ERR_ALLOW 0x0000080 #define ACL_DELETE_SET_DENY 0x0000100 #define ACL_DELETE_SET_ALLOW 0x0000200 #define ACL_DELETE_ERR_DENY 0x0000400 #define ACL_DELETE_ERR_ALLOW 0x0000800 #define ACL_WRITE_ATTRS_OWNER_SET_DENY 0x0001000 #define ACL_WRITE_ATTRS_OWNER_SET_ALLOW 0x0002000 #define ACL_WRITE_ATTRS_OWNER_ERR_DENY 0x0004000 #define ACL_WRITE_ATTRS_OWNER_ERR_ALLOW 0x0008000 #define ACL_WRITE_ATTRS_WRITER_SET_DENY 0x0010000 #define ACL_WRITE_ATTRS_WRITER_SET_ALLOW 0x0020000 #define ACL_WRITE_ATTRS_WRITER_ERR_DENY 0x0040000 #define ACL_WRITE_ATTRS_WRITER_ERR_ALLOW 0x0080000 #define ACL_WRITE_NAMED_WRITER_SET_DENY 0x0100000 #define ACL_WRITE_NAMED_WRITER_SET_ALLOW 0x0200000 #define ACL_WRITE_NAMED_WRITER_ERR_DENY 0x0400000 #define ACL_WRITE_NAMED_WRITER_ERR_ALLOW 0x0800000 #define ACL_READ_NAMED_READER_SET_DENY 0x1000000 #define ACL_READ_NAMED_READER_SET_ALLOW 0x2000000 #define ACL_READ_NAMED_READER_ERR_DENY 0x4000000 #define ACL_READ_NAMED_READER_ERR_ALLOW 0x8000000 #define ACE_VALID_MASK_BITS (\ ACE_READ_DATA | \ ACE_LIST_DIRECTORY | \ ACE_WRITE_DATA | \ ACE_ADD_FILE | \ ACE_APPEND_DATA | \ ACE_ADD_SUBDIRECTORY | \ ACE_READ_NAMED_ATTRS | \ ACE_WRITE_NAMED_ATTRS | \ ACE_EXECUTE | \ ACE_DELETE_CHILD | \ ACE_READ_ATTRIBUTES | \ ACE_WRITE_ATTRIBUTES | \ ACE_DELETE | \ ACE_READ_ACL | \ ACE_WRITE_ACL | \ ACE_WRITE_OWNER | \ ACE_SYNCHRONIZE) #define ACE_MASK_UNDEFINED 0x80000000 #define ACE_VALID_FLAG_BITS (ACE_FILE_INHERIT_ACE | \ ACE_DIRECTORY_INHERIT_ACE | \ ACE_NO_PROPAGATE_INHERIT_ACE | ACE_INHERIT_ONLY_ACE | \ ACE_SUCCESSFUL_ACCESS_ACE_FLAG | ACE_FAILED_ACCESS_ACE_FLAG | \ ACE_IDENTIFIER_GROUP | ACE_OWNER | ACE_GROUP | ACE_EVERYONE) /* * ACL conversion helpers */ typedef enum { ace_unused, ace_user_obj, ace_user, ace_group, /* includes GROUP and GROUP_OBJ */ ace_other_obj } ace_to_aent_state_t; typedef struct acevals { uid_t key; avl_node_t avl; uint32_t mask; uint32_t allowed; uint32_t denied; int aent_type; } acevals_t; typedef struct ace_list { acevals_t user_obj; avl_tree_t user; int numusers; acevals_t group_obj; avl_tree_t group; int numgroups; acevals_t other_obj; uint32_t acl_mask; int hasmask; int dfacl_flag; ace_to_aent_state_t state; int seen; /* bitmask of all aclent_t a_type values seen */ } ace_list_t; /* * Generic shellsort, from K&R (1st ed, p 58.), somewhat modified. * v = Ptr to array/vector of objs * n = # objs in the array * s = size of each obj (must be multiples of a word size) * f = ptr to function to compare two objs * returns (-1 = less than, 0 = equal, 1 = greater than */ void ksort(caddr_t v, int n, int s, int (*f)()) { int g, i, j, ii; unsigned int *p1, *p2; unsigned int tmp; /* No work to do */ if (v == NULL || n <= 1) return; /* Sanity check on arguments */ ASSERT(((uintptr_t)v & 0x3) == 0 && (s & 0x3) == 0); ASSERT(s > 0); for (g = n / 2; g > 0; g /= 2) { for (i = g; i < n; i++) { for (j = i - g; j >= 0 && (*f)(v + j * s, v + (j + g) * s) == 1; j -= g) { p1 = (void *)(v + j * s); p2 = (void *)(v + (j + g) * s); for (ii = 0; ii < s / 4; ii++) { tmp = *p1; *p1++ = *p2; *p2++ = tmp; } } } } } /* * Compare two acls, all fields. Returns: * -1 (less than) * 0 (equal) * +1 (greater than) */ int cmp2acls(void *a, void *b) { aclent_t *x = (aclent_t *)a; aclent_t *y = (aclent_t *)b; /* Compare types */ if (x->a_type < y->a_type) return (-1); if (x->a_type > y->a_type) return (1); /* Equal types; compare id's */ if (x->a_id < y->a_id) return (-1); if (x->a_id > y->a_id) return (1); /* Equal ids; compare perms */ if (x->a_perm < y->a_perm) return (-1); if (x->a_perm > y->a_perm) return (1); /* Totally equal */ return (0); } static int cacl_malloc(void **ptr, size_t size) { *ptr = kmem_zalloc(size, KM_SLEEP); return (0); } #if !defined(_KERNEL) acl_t * acl_alloc(enum acl_type type) { acl_t *aclp; if (cacl_malloc((void **)&aclp, sizeof (acl_t)) != 0) return (NULL); aclp->acl_aclp = NULL; aclp->acl_cnt = 0; switch (type) { case ACE_T: aclp->acl_type = ACE_T; aclp->acl_entry_size = sizeof (ace_t); break; case ACLENT_T: aclp->acl_type = ACLENT_T; aclp->acl_entry_size = sizeof (aclent_t); break; default: acl_free(aclp); aclp = NULL; } return (aclp); } /* * Free acl_t structure */ void acl_free(acl_t *aclp) { int acl_size; if (aclp == NULL) return; if (aclp->acl_aclp) { acl_size = aclp->acl_cnt * aclp->acl_entry_size; cacl_free(aclp->acl_aclp, acl_size); } cacl_free(aclp, sizeof (acl_t)); } static uint32_t access_mask_set(int haswriteperm, int hasreadperm, int isowner, int isallow) { uint32_t access_mask = 0; int acl_produce; int synchronize_set = 0, write_owner_set = 0; int delete_set = 0, write_attrs_set = 0; int read_named_set = 0, write_named_set = 0; acl_produce = (ACL_SYNCHRONIZE_SET_ALLOW | ACL_WRITE_ATTRS_OWNER_SET_ALLOW | ACL_WRITE_ATTRS_WRITER_SET_DENY); if (isallow) { synchronize_set = ACL_SYNCHRONIZE_SET_ALLOW; write_owner_set = ACL_WRITE_OWNER_SET_ALLOW; delete_set = ACL_DELETE_SET_ALLOW; if (hasreadperm) read_named_set = ACL_READ_NAMED_READER_SET_ALLOW; if (haswriteperm) write_named_set = ACL_WRITE_NAMED_WRITER_SET_ALLOW; if (isowner) write_attrs_set = ACL_WRITE_ATTRS_OWNER_SET_ALLOW; else if (haswriteperm) write_attrs_set = ACL_WRITE_ATTRS_WRITER_SET_ALLOW; } else { synchronize_set = ACL_SYNCHRONIZE_SET_DENY; write_owner_set = ACL_WRITE_OWNER_SET_DENY; delete_set = ACL_DELETE_SET_DENY; if (hasreadperm) read_named_set = ACL_READ_NAMED_READER_SET_DENY; if (haswriteperm) write_named_set = ACL_WRITE_NAMED_WRITER_SET_DENY; if (isowner) write_attrs_set = ACL_WRITE_ATTRS_OWNER_SET_DENY; else if (haswriteperm) write_attrs_set = ACL_WRITE_ATTRS_WRITER_SET_DENY; else /* * If the entity is not the owner and does not * have write permissions ACE_WRITE_ATTRIBUTES will * always go in the DENY ACE. */ access_mask |= ACE_WRITE_ATTRIBUTES; } if (acl_produce & synchronize_set) access_mask |= ACE_SYNCHRONIZE; if (acl_produce & write_owner_set) access_mask |= ACE_WRITE_OWNER; if (acl_produce & delete_set) access_mask |= ACE_DELETE; if (acl_produce & write_attrs_set) access_mask |= ACE_WRITE_ATTRIBUTES; if (acl_produce & read_named_set) access_mask |= ACE_READ_NAMED_ATTRS; if (acl_produce & write_named_set) access_mask |= ACE_WRITE_NAMED_ATTRS; return (access_mask); } /* * Given an mode_t, convert it into an access_mask as used * by nfsace, assuming aclent_t -> nfsace semantics. */ static uint32_t mode_to_ace_access(mode_t mode, boolean_t isdir, int isowner, int isallow) { uint32_t access = 0; int haswriteperm = 0; int hasreadperm = 0; if (isallow) { haswriteperm = (mode & S_IWOTH); hasreadperm = (mode & S_IROTH); } else { haswriteperm = !(mode & S_IWOTH); hasreadperm = !(mode & S_IROTH); } /* * The following call takes care of correctly setting the following * mask bits in the access_mask: * ACE_SYNCHRONIZE, ACE_WRITE_OWNER, ACE_DELETE, * ACE_WRITE_ATTRIBUTES, ACE_WRITE_NAMED_ATTRS, ACE_READ_NAMED_ATTRS */ access = access_mask_set(haswriteperm, hasreadperm, isowner, isallow); if (isallow) { access |= ACE_READ_ACL | ACE_READ_ATTRIBUTES; if (isowner) access |= ACE_WRITE_ACL; } else { if (! isowner) access |= ACE_WRITE_ACL; } /* read */ if (mode & S_IROTH) { access |= ACE_READ_DATA; } /* write */ if (mode & S_IWOTH) { access |= ACE_WRITE_DATA | ACE_APPEND_DATA; if (isdir) access |= ACE_DELETE_CHILD; } /* exec */ if (mode & S_IXOTH) { access |= ACE_EXECUTE; } return (access); } /* * Given an nfsace (presumably an ALLOW entry), make a * corresponding DENY entry at the address given. */ static void ace_make_deny(ace_t *allow, ace_t *deny, int isdir, int isowner) { (void) memcpy(deny, allow, sizeof (ace_t)); deny->a_who = allow->a_who; deny->a_type = ACE_ACCESS_DENIED_ACE_TYPE; deny->a_access_mask ^= ACE_POSIX_SUPPORTED_BITS; if (isdir) deny->a_access_mask ^= ACE_DELETE_CHILD; deny->a_access_mask &= ~(ACE_SYNCHRONIZE | ACE_WRITE_OWNER | ACE_DELETE | ACE_WRITE_ATTRIBUTES | ACE_READ_NAMED_ATTRS | ACE_WRITE_NAMED_ATTRS); deny->a_access_mask |= access_mask_set((allow->a_access_mask & ACE_WRITE_DATA), (allow->a_access_mask & ACE_READ_DATA), isowner, B_FALSE); } /* * Make an initial pass over an array of aclent_t's. Gather * information such as an ACL_MASK (if any), number of users, * number of groups, and whether the array needs to be sorted. */ static int ln_aent_preprocess(aclent_t *aclent, int n, int *hasmask, mode_t *mask, int *numuser, int *numgroup, int *needsort) { int error = 0; int i; int curtype = 0; *hasmask = 0; *mask = 07; *needsort = 0; *numuser = 0; *numgroup = 0; for (i = 0; i < n; i++) { if (aclent[i].a_type < curtype) *needsort = 1; else if (aclent[i].a_type > curtype) curtype = aclent[i].a_type; if (aclent[i].a_type & USER) (*numuser)++; if (aclent[i].a_type & (GROUP | GROUP_OBJ)) (*numgroup)++; if (aclent[i].a_type & CLASS_OBJ) { if (*hasmask) { error = EINVAL; goto out; } else { *hasmask = 1; *mask = aclent[i].a_perm; } } } if ((! *hasmask) && (*numuser + *numgroup > 1)) { error = EINVAL; goto out; } out: return (error); } /* * Convert an array of aclent_t into an array of nfsace entries, * following POSIX draft -> nfsv4 conversion semantics as outlined in * the IETF draft. */ static int ln_aent_to_ace(aclent_t *aclent, int n, ace_t **acepp, int *rescount, int isdir) { int error = 0; mode_t mask; int numuser, numgroup, needsort; int resultsize = 0; int i, groupi = 0, skip; ace_t *acep, *result = NULL; int hasmask; error = ln_aent_preprocess(aclent, n, &hasmask, &mask, &numuser, &numgroup, &needsort); if (error != 0) goto out; /* allow + deny for each aclent */ resultsize = n * 2; if (hasmask) { /* * stick extra deny on the group_obj and on each * user|group for the mask (the group_obj was added * into the count for numgroup) */ resultsize += numuser + numgroup; /* ... and don't count the mask itself */ resultsize -= 2; } /* sort the source if necessary */ if (needsort) ksort((caddr_t)aclent, n, sizeof (aclent_t), cmp2acls); if (cacl_malloc((void **)&result, resultsize * sizeof (ace_t)) != 0) goto out; acep = result; for (i = 0; i < n; i++) { /* * don't process CLASS_OBJ (mask); mask was grabbed in * ln_aent_preprocess() */ if (aclent[i].a_type & CLASS_OBJ) continue; /* If we need an ACL_MASK emulator, prepend it now */ if ((hasmask) && (aclent[i].a_type & (USER | GROUP | GROUP_OBJ))) { acep->a_type = ACE_ACCESS_DENIED_ACE_TYPE; acep->a_flags = 0; if (aclent[i].a_type & GROUP_OBJ) { acep->a_who = (uid_t)-1; acep->a_flags |= (ACE_IDENTIFIER_GROUP|ACE_GROUP); } else if (aclent[i].a_type & USER) { acep->a_who = aclent[i].a_id; } else { acep->a_who = aclent[i].a_id; acep->a_flags |= ACE_IDENTIFIER_GROUP; } if (aclent[i].a_type & ACL_DEFAULT) { acep->a_flags |= ACE_INHERIT_ONLY_ACE | ACE_FILE_INHERIT_ACE | ACE_DIRECTORY_INHERIT_ACE; } /* * Set the access mask for the prepended deny * ace. To do this, we invert the mask (found * in ln_aent_preprocess()) then convert it to an * DENY ace access_mask. */ acep->a_access_mask = mode_to_ace_access((mask ^ 07), isdir, 0, 0); acep += 1; } /* handle a_perm -> access_mask */ acep->a_access_mask = mode_to_ace_access(aclent[i].a_perm, isdir, aclent[i].a_type & USER_OBJ, 1); /* emulate a default aclent */ if (aclent[i].a_type & ACL_DEFAULT) { acep->a_flags |= ACE_INHERIT_ONLY_ACE | ACE_FILE_INHERIT_ACE | ACE_DIRECTORY_INHERIT_ACE; } /* * handle a_perm and a_id * * this must be done last, since it involves the * corresponding deny aces, which are handled * differently for each different a_type. */ if (aclent[i].a_type & USER_OBJ) { acep->a_who = (uid_t)-1; acep->a_flags |= ACE_OWNER; ace_make_deny(acep, acep + 1, isdir, B_TRUE); acep += 2; } else if (aclent[i].a_type & USER) { acep->a_who = aclent[i].a_id; ace_make_deny(acep, acep + 1, isdir, B_FALSE); acep += 2; } else if (aclent[i].a_type & (GROUP_OBJ | GROUP)) { if (aclent[i].a_type & GROUP_OBJ) { acep->a_who = (uid_t)-1; acep->a_flags |= ACE_GROUP; } else { acep->a_who = aclent[i].a_id; } acep->a_flags |= ACE_IDENTIFIER_GROUP; /* * Set the corresponding deny for the group ace. * * The deny aces go after all of the groups, unlike * everything else, where they immediately follow * the allow ace. * * We calculate "skip", the number of slots to * skip ahead for the deny ace, here. * * The pattern is: * MD1 A1 MD2 A2 MD3 A3 D1 D2 D3 * thus, skip is * (2 * numgroup) - 1 - groupi * (2 * numgroup) to account for MD + A * - 1 to account for the fact that we're on the * access (A), not the mask (MD) * - groupi to account for the fact that we have * passed up groupi number of MD's. */ skip = (2 * numgroup) - 1 - groupi; ace_make_deny(acep, acep + skip, isdir, B_FALSE); /* * If we just did the last group, skip acep past * all of the denies; else, just move ahead one. */ if (++groupi >= numgroup) acep += numgroup + 1; else acep += 1; } else if (aclent[i].a_type & OTHER_OBJ) { acep->a_who = (uid_t)-1; acep->a_flags |= ACE_EVERYONE; ace_make_deny(acep, acep + 1, isdir, B_FALSE); acep += 2; } else { error = EINVAL; goto out; } } *acepp = result; *rescount = resultsize; out: if (error != 0) { if ((result != NULL) && (resultsize > 0)) { cacl_free(result, resultsize * sizeof (ace_t)); } } return (error); } static int convert_aent_to_ace(aclent_t *aclentp, int aclcnt, boolean_t isdir, ace_t **retacep, int *retacecnt) { ace_t *acep; ace_t *dfacep; int acecnt = 0; int dfacecnt = 0; int dfaclstart = 0; int dfaclcnt = 0; aclent_t *aclp; int i; int error; int acesz, dfacesz; ksort((caddr_t)aclentp, aclcnt, sizeof (aclent_t), cmp2acls); for (i = 0, aclp = aclentp; i < aclcnt; aclp++, i++) { if (aclp->a_type & ACL_DEFAULT) break; } if (i < aclcnt) { dfaclstart = i; dfaclcnt = aclcnt - i; } if (dfaclcnt && !isdir) { return (EINVAL); } error = ln_aent_to_ace(aclentp, i, &acep, &acecnt, isdir); if (error) return (error); if (dfaclcnt) { error = ln_aent_to_ace(&aclentp[dfaclstart], dfaclcnt, &dfacep, &dfacecnt, isdir); if (error) { if (acep) { cacl_free(acep, acecnt * sizeof (ace_t)); } return (error); } } if (dfacecnt != 0) { acesz = sizeof (ace_t) * acecnt; dfacesz = sizeof (ace_t) * dfacecnt; acep = cacl_realloc(acep, acesz, acesz + dfacesz); if (acep == NULL) return (ENOMEM); if (dfaclcnt) { (void) memcpy(acep + acecnt, dfacep, dfacesz); } } if (dfaclcnt) cacl_free(dfacep, dfacecnt * sizeof (ace_t)); *retacecnt = acecnt + dfacecnt; *retacep = acep; return (0); } static int ace_mask_to_mode(uint32_t mask, o_mode_t *modep, boolean_t isdir) { int error = 0; o_mode_t mode = 0; uint32_t bits, wantbits; /* read */ if (mask & ACE_READ_DATA) mode |= S_IROTH; /* write */ wantbits = (ACE_WRITE_DATA | ACE_APPEND_DATA); if (isdir) wantbits |= ACE_DELETE_CHILD; bits = mask & wantbits; if (bits != 0) { if (bits != wantbits) { error = ENOTSUP; goto out; } mode |= S_IWOTH; } /* exec */ if (mask & ACE_EXECUTE) { mode |= S_IXOTH; } *modep = mode; out: return (error); } static void acevals_init(acevals_t *vals, uid_t key) { bzero(vals, sizeof (*vals)); vals->allowed = ACE_MASK_UNDEFINED; vals->denied = ACE_MASK_UNDEFINED; vals->mask = ACE_MASK_UNDEFINED; vals->key = key; } static void ace_list_init(ace_list_t *al, int dfacl_flag) { acevals_init(&al->user_obj, 0); acevals_init(&al->group_obj, 0); acevals_init(&al->other_obj, 0); al->numusers = 0; al->numgroups = 0; al->acl_mask = 0; al->hasmask = 0; al->state = ace_unused; al->seen = 0; al->dfacl_flag = dfacl_flag; } /* * Find or create an acevals holder for a given id and avl tree. * * Note that only one thread will ever touch these avl trees, so * there is no need for locking. */ static acevals_t * acevals_find(ace_t *ace, avl_tree_t *avl, int *num) { acevals_t key, *rc; avl_index_t where; key.key = ace->a_who; rc = avl_find(avl, &key, &where); if (rc != NULL) return (rc); /* this memory is freed by ln_ace_to_aent()->ace_list_free() */ if (cacl_malloc((void **)&rc, sizeof (acevals_t)) != 0) return (NULL); acevals_init(rc, ace->a_who); avl_insert(avl, rc, where); (*num)++; return (rc); } static int access_mask_check(ace_t *acep, int mask_bit, int isowner) { int set_deny, err_deny; int set_allow, err_allow; int acl_consume; int haswriteperm, hasreadperm; if (acep->a_type == ACE_ACCESS_DENIED_ACE_TYPE) { haswriteperm = (acep->a_access_mask & ACE_WRITE_DATA) ? 0 : 1; hasreadperm = (acep->a_access_mask & ACE_READ_DATA) ? 0 : 1; } else { haswriteperm = (acep->a_access_mask & ACE_WRITE_DATA) ? 1 : 0; hasreadperm = (acep->a_access_mask & ACE_READ_DATA) ? 1 : 0; } acl_consume = (ACL_SYNCHRONIZE_ERR_DENY | ACL_DELETE_ERR_DENY | ACL_WRITE_OWNER_ERR_DENY | ACL_WRITE_OWNER_ERR_ALLOW | ACL_WRITE_ATTRS_OWNER_SET_ALLOW | ACL_WRITE_ATTRS_OWNER_ERR_DENY | ACL_WRITE_ATTRS_WRITER_SET_DENY | ACL_WRITE_ATTRS_WRITER_ERR_ALLOW | ACL_WRITE_NAMED_WRITER_ERR_DENY | ACL_READ_NAMED_READER_ERR_DENY); if (mask_bit == ACE_SYNCHRONIZE) { set_deny = ACL_SYNCHRONIZE_SET_DENY; err_deny = ACL_SYNCHRONIZE_ERR_DENY; set_allow = ACL_SYNCHRONIZE_SET_ALLOW; err_allow = ACL_SYNCHRONIZE_ERR_ALLOW; } else if (mask_bit == ACE_WRITE_OWNER) { set_deny = ACL_WRITE_OWNER_SET_DENY; err_deny = ACL_WRITE_OWNER_ERR_DENY; set_allow = ACL_WRITE_OWNER_SET_ALLOW; err_allow = ACL_WRITE_OWNER_ERR_ALLOW; } else if (mask_bit == ACE_DELETE) { set_deny = ACL_DELETE_SET_DENY; err_deny = ACL_DELETE_ERR_DENY; set_allow = ACL_DELETE_SET_ALLOW; err_allow = ACL_DELETE_ERR_ALLOW; } else if (mask_bit == ACE_WRITE_ATTRIBUTES) { if (isowner) { set_deny = ACL_WRITE_ATTRS_OWNER_SET_DENY; err_deny = ACL_WRITE_ATTRS_OWNER_ERR_DENY; set_allow = ACL_WRITE_ATTRS_OWNER_SET_ALLOW; err_allow = ACL_WRITE_ATTRS_OWNER_ERR_ALLOW; } else if (haswriteperm) { set_deny = ACL_WRITE_ATTRS_WRITER_SET_DENY; err_deny = ACL_WRITE_ATTRS_WRITER_ERR_DENY; set_allow = ACL_WRITE_ATTRS_WRITER_SET_ALLOW; err_allow = ACL_WRITE_ATTRS_WRITER_ERR_ALLOW; } else { if ((acep->a_access_mask & mask_bit) && (acep->a_type & ACE_ACCESS_ALLOWED_ACE_TYPE)) { return (ENOTSUP); } return (0); } } else if (mask_bit == ACE_READ_NAMED_ATTRS) { if (!hasreadperm) return (0); set_deny = ACL_READ_NAMED_READER_SET_DENY; err_deny = ACL_READ_NAMED_READER_ERR_DENY; set_allow = ACL_READ_NAMED_READER_SET_ALLOW; err_allow = ACL_READ_NAMED_READER_ERR_ALLOW; } else if (mask_bit == ACE_WRITE_NAMED_ATTRS) { if (!haswriteperm) return (0); set_deny = ACL_WRITE_NAMED_WRITER_SET_DENY; err_deny = ACL_WRITE_NAMED_WRITER_ERR_DENY; set_allow = ACL_WRITE_NAMED_WRITER_SET_ALLOW; err_allow = ACL_WRITE_NAMED_WRITER_ERR_ALLOW; } else { return (EINVAL); } if (acep->a_type == ACE_ACCESS_DENIED_ACE_TYPE) { if (acl_consume & set_deny) { if (!(acep->a_access_mask & mask_bit)) { return (ENOTSUP); } } else if (acl_consume & err_deny) { if (acep->a_access_mask & mask_bit) { return (ENOTSUP); } } } else { /* ACE_ACCESS_ALLOWED_ACE_TYPE */ if (acl_consume & set_allow) { if (!(acep->a_access_mask & mask_bit)) { return (ENOTSUP); } } else if (acl_consume & err_allow) { if (acep->a_access_mask & mask_bit) { return (ENOTSUP); } } } return (0); } static int ace_to_aent_legal(ace_t *acep) { int error = 0; int isowner; /* only ALLOW or DENY */ if ((acep->a_type != ACE_ACCESS_ALLOWED_ACE_TYPE) && (acep->a_type != ACE_ACCESS_DENIED_ACE_TYPE)) { error = ENOTSUP; goto out; } /* check for invalid flags */ if (acep->a_flags & ~(ACE_VALID_FLAG_BITS)) { error = EINVAL; goto out; } /* some flags are illegal */ if (acep->a_flags & (ACE_SUCCESSFUL_ACCESS_ACE_FLAG | ACE_FAILED_ACCESS_ACE_FLAG | ACE_NO_PROPAGATE_INHERIT_ACE)) { error = ENOTSUP; goto out; } /* check for invalid masks */ if (acep->a_access_mask & ~(ACE_VALID_MASK_BITS)) { error = EINVAL; goto out; } if ((acep->a_flags & ACE_OWNER)) { isowner = 1; } else { isowner = 0; } error = access_mask_check(acep, ACE_SYNCHRONIZE, isowner); if (error) goto out; error = access_mask_check(acep, ACE_WRITE_OWNER, isowner); if (error) goto out; error = access_mask_check(acep, ACE_DELETE, isowner); if (error) goto out; error = access_mask_check(acep, ACE_WRITE_ATTRIBUTES, isowner); if (error) goto out; error = access_mask_check(acep, ACE_READ_NAMED_ATTRS, isowner); if (error) goto out; error = access_mask_check(acep, ACE_WRITE_NAMED_ATTRS, isowner); if (error) goto out; /* more detailed checking of masks */ if (acep->a_type == ACE_ACCESS_ALLOWED_ACE_TYPE) { if (! (acep->a_access_mask & ACE_READ_ATTRIBUTES)) { error = ENOTSUP; goto out; } if ((acep->a_access_mask & ACE_WRITE_DATA) && (! (acep->a_access_mask & ACE_APPEND_DATA))) { error = ENOTSUP; goto out; } if ((! (acep->a_access_mask & ACE_WRITE_DATA)) && (acep->a_access_mask & ACE_APPEND_DATA)) { error = ENOTSUP; goto out; } } /* ACL enforcement */ if ((acep->a_access_mask & ACE_READ_ACL) && (acep->a_type != ACE_ACCESS_ALLOWED_ACE_TYPE)) { error = ENOTSUP; goto out; } if (acep->a_access_mask & ACE_WRITE_ACL) { if ((acep->a_type == ACE_ACCESS_DENIED_ACE_TYPE) && (isowner)) { error = ENOTSUP; goto out; } if ((acep->a_type == ACE_ACCESS_ALLOWED_ACE_TYPE) && (! isowner)) { error = ENOTSUP; goto out; } } out: return (error); } static int ace_allow_to_mode(uint32_t mask, o_mode_t *modep, boolean_t isdir) { /* ACE_READ_ACL and ACE_READ_ATTRIBUTES must both be set */ if ((mask & (ACE_READ_ACL | ACE_READ_ATTRIBUTES)) != (ACE_READ_ACL | ACE_READ_ATTRIBUTES)) { return (ENOTSUP); } return (ace_mask_to_mode(mask, modep, isdir)); } static int acevals_to_aent(acevals_t *vals, aclent_t *dest, ace_list_t *list, uid_t owner, gid_t group, boolean_t isdir) { int error; uint32_t flips = ACE_POSIX_SUPPORTED_BITS; if (isdir) flips |= ACE_DELETE_CHILD; if (vals->allowed != (vals->denied ^ flips)) { error = ENOTSUP; goto out; } if ((list->hasmask) && (list->acl_mask != vals->mask) && (vals->aent_type & (USER | GROUP | GROUP_OBJ))) { error = ENOTSUP; goto out; } error = ace_allow_to_mode(vals->allowed, &dest->a_perm, isdir); if (error != 0) goto out; dest->a_type = vals->aent_type; if (dest->a_type & (USER | GROUP)) { dest->a_id = vals->key; } else if (dest->a_type & USER_OBJ) { dest->a_id = owner; } else if (dest->a_type & GROUP_OBJ) { dest->a_id = group; } else if (dest->a_type & OTHER_OBJ) { dest->a_id = 0; } else { error = EINVAL; goto out; } out: return (error); } static int ace_list_to_aent(ace_list_t *list, aclent_t **aclentp, int *aclcnt, uid_t owner, gid_t group, boolean_t isdir) { int error = 0; aclent_t *aent, *result = NULL; acevals_t *vals; int resultcount; if ((list->seen & (USER_OBJ | GROUP_OBJ | OTHER_OBJ)) != (USER_OBJ | GROUP_OBJ | OTHER_OBJ)) { error = ENOTSUP; goto out; } if ((! list->hasmask) && (list->numusers + list->numgroups > 0)) { error = ENOTSUP; goto out; } resultcount = 3 + list->numusers + list->numgroups; /* * This must be the same condition as below, when we add the CLASS_OBJ * (aka ACL mask) */ if ((list->hasmask) || (! list->dfacl_flag)) resultcount += 1; if (cacl_malloc((void **)&result, resultcount * sizeof (aclent_t)) != 0) { error = ENOMEM; goto out; } aent = result; /* USER_OBJ */ if (!(list->user_obj.aent_type & USER_OBJ)) { error = EINVAL; goto out; } error = acevals_to_aent(&list->user_obj, aent, list, owner, group, isdir); if (error != 0) goto out; ++aent; /* USER */ vals = NULL; for (vals = avl_first(&list->user); vals != NULL; vals = AVL_NEXT(&list->user, vals)) { if (!(vals->aent_type & USER)) { error = EINVAL; goto out; } error = acevals_to_aent(vals, aent, list, owner, group, isdir); if (error != 0) goto out; ++aent; } /* GROUP_OBJ */ if (!(list->group_obj.aent_type & GROUP_OBJ)) { error = EINVAL; goto out; } error = acevals_to_aent(&list->group_obj, aent, list, owner, group, isdir); if (error != 0) goto out; ++aent; /* GROUP */ vals = NULL; for (vals = avl_first(&list->group); vals != NULL; vals = AVL_NEXT(&list->group, vals)) { if (!(vals->aent_type & GROUP)) { error = EINVAL; goto out; } error = acevals_to_aent(vals, aent, list, owner, group, isdir); if (error != 0) goto out; ++aent; } /* * CLASS_OBJ (aka ACL_MASK) * * An ACL_MASK is not fabricated if the ACL is a default ACL. * This is to follow UFS's behavior. */ if ((list->hasmask) || (! list->dfacl_flag)) { if (list->hasmask) { uint32_t flips = ACE_POSIX_SUPPORTED_BITS; if (isdir) flips |= ACE_DELETE_CHILD; error = ace_mask_to_mode(list->acl_mask ^ flips, &aent->a_perm, isdir); if (error != 0) goto out; } else { /* fabricate the ACL_MASK from the group permissions */ error = ace_mask_to_mode(list->group_obj.allowed, &aent->a_perm, isdir); if (error != 0) goto out; } aent->a_id = 0; aent->a_type = CLASS_OBJ | list->dfacl_flag; ++aent; } /* OTHER_OBJ */ if (!(list->other_obj.aent_type & OTHER_OBJ)) { error = EINVAL; goto out; } error = acevals_to_aent(&list->other_obj, aent, list, owner, group, isdir); if (error != 0) goto out; ++aent; *aclentp = result; *aclcnt = resultcount; out: if (error != 0) { if (result != NULL) cacl_free(result, resultcount * sizeof (aclent_t)); } return (error); } /* * free all data associated with an ace_list */ static void ace_list_free(ace_list_t *al) { acevals_t *node; void *cookie; if (al == NULL) return; cookie = NULL; while ((node = avl_destroy_nodes(&al->user, &cookie)) != NULL) cacl_free(node, sizeof (acevals_t)); cookie = NULL; while ((node = avl_destroy_nodes(&al->group, &cookie)) != NULL) cacl_free(node, sizeof (acevals_t)); avl_destroy(&al->user); avl_destroy(&al->group); /* free the container itself */ cacl_free(al, sizeof (ace_list_t)); } static int acevals_compare(const void *va, const void *vb) { const acevals_t *a = va, *b = vb; if (a->key == b->key) return (0); if (a->key > b->key) return (1); else return (-1); } /* * Convert a list of ace_t entries to equivalent regular and default * aclent_t lists. Return error (ENOTSUP) when conversion is not possible. */ static int ln_ace_to_aent(ace_t *ace, int n, uid_t owner, gid_t group, aclent_t **aclentp, int *aclcnt, aclent_t **dfaclentp, int *dfaclcnt, boolean_t isdir) { int error = 0; ace_t *acep; uint32_t bits; int i; ace_list_t *normacl = NULL, *dfacl = NULL, *acl; acevals_t *vals; *aclentp = NULL; *aclcnt = 0; *dfaclentp = NULL; *dfaclcnt = 0; /* we need at least user_obj, group_obj, and other_obj */ if (n < 6) { error = ENOTSUP; goto out; } if (ace == NULL) { error = EINVAL; goto out; } error = cacl_malloc((void **)&normacl, sizeof (ace_list_t)); if (error != 0) goto out; avl_create(&normacl->user, acevals_compare, sizeof (acevals_t), offsetof(acevals_t, avl)); avl_create(&normacl->group, acevals_compare, sizeof (acevals_t), offsetof(acevals_t, avl)); ace_list_init(normacl, 0); error = cacl_malloc((void **)&dfacl, sizeof (ace_list_t)); if (error != 0) goto out; avl_create(&dfacl->user, acevals_compare, sizeof (acevals_t), offsetof(acevals_t, avl)); avl_create(&dfacl->group, acevals_compare, sizeof (acevals_t), offsetof(acevals_t, avl)); ace_list_init(dfacl, ACL_DEFAULT); /* process every ace_t... */ for (i = 0; i < n; i++) { acep = &ace[i]; /* rule out certain cases quickly */ error = ace_to_aent_legal(acep); if (error != 0) goto out; /* * Turn off these bits in order to not have to worry about * them when doing the checks for compliments. */ acep->a_access_mask &= ~(ACE_WRITE_OWNER | ACE_DELETE | ACE_SYNCHRONIZE | ACE_WRITE_ATTRIBUTES | ACE_READ_NAMED_ATTRS | ACE_WRITE_NAMED_ATTRS); /* see if this should be a regular or default acl */ bits = acep->a_flags & (ACE_INHERIT_ONLY_ACE | ACE_FILE_INHERIT_ACE | ACE_DIRECTORY_INHERIT_ACE); if (bits != 0) { /* all or nothing on these inherit bits */ if (bits != (ACE_INHERIT_ONLY_ACE | ACE_FILE_INHERIT_ACE | ACE_DIRECTORY_INHERIT_ACE)) { error = ENOTSUP; goto out; } acl = dfacl; } else { acl = normacl; } if ((acep->a_flags & ACE_OWNER)) { if (acl->state > ace_user_obj) { error = ENOTSUP; goto out; } acl->state = ace_user_obj; acl->seen |= USER_OBJ; vals = &acl->user_obj; vals->aent_type = USER_OBJ | acl->dfacl_flag; } else if ((acep->a_flags & ACE_EVERYONE)) { acl->state = ace_other_obj; acl->seen |= OTHER_OBJ; vals = &acl->other_obj; vals->aent_type = OTHER_OBJ | acl->dfacl_flag; } else if (acep->a_flags & ACE_IDENTIFIER_GROUP) { if (acl->state > ace_group) { error = ENOTSUP; goto out; } if ((acep->a_flags & ACE_GROUP)) { acl->seen |= GROUP_OBJ; vals = &acl->group_obj; vals->aent_type = GROUP_OBJ | acl->dfacl_flag; } else { acl->seen |= GROUP; vals = acevals_find(acep, &acl->group, &acl->numgroups); if (vals == NULL) { error = ENOMEM; goto out; } vals->aent_type = GROUP | acl->dfacl_flag; } acl->state = ace_group; } else { if (acl->state > ace_user) { error = ENOTSUP; goto out; } acl->state = ace_user; acl->seen |= USER; vals = acevals_find(acep, &acl->user, &acl->numusers); if (vals == NULL) { error = ENOMEM; goto out; } vals->aent_type = USER | acl->dfacl_flag; } if (!(acl->state > ace_unused)) { error = EINVAL; goto out; } if (acep->a_type == ACE_ACCESS_ALLOWED_ACE_TYPE) { /* no more than one allowed per aclent_t */ if (vals->allowed != ACE_MASK_UNDEFINED) { error = ENOTSUP; goto out; } vals->allowed = acep->a_access_mask; } else { /* * it's a DENY; if there was a previous DENY, it * must have been an ACL_MASK. */ if (vals->denied != ACE_MASK_UNDEFINED) { /* ACL_MASK is for USER and GROUP only */ if ((acl->state != ace_user) && (acl->state != ace_group)) { error = ENOTSUP; goto out; } if (! acl->hasmask) { acl->hasmask = 1; acl->acl_mask = vals->denied; /* check for mismatched ACL_MASK emulations */ } else if (acl->acl_mask != vals->denied) { error = ENOTSUP; goto out; } vals->mask = vals->denied; } vals->denied = acep->a_access_mask; } } /* done collating; produce the aclent_t lists */ if (normacl->state != ace_unused) { error = ace_list_to_aent(normacl, aclentp, aclcnt, owner, group, isdir); if (error != 0) { goto out; } } if (dfacl->state != ace_unused) { error = ace_list_to_aent(dfacl, dfaclentp, dfaclcnt, owner, group, isdir); if (error != 0) { goto out; } } out: if (normacl != NULL) ace_list_free(normacl); if (dfacl != NULL) ace_list_free(dfacl); return (error); } static int convert_ace_to_aent(ace_t *acebufp, int acecnt, boolean_t isdir, uid_t owner, gid_t group, aclent_t **retaclentp, int *retaclcnt) { int error = 0; aclent_t *aclentp, *dfaclentp; int aclcnt, dfaclcnt; int aclsz, dfaclsz; error = ln_ace_to_aent(acebufp, acecnt, owner, group, &aclentp, &aclcnt, &dfaclentp, &dfaclcnt, isdir); if (error) return (error); if (dfaclcnt != 0) { /* * Slap aclentp and dfaclentp into a single array. */ aclsz = sizeof (aclent_t) * aclcnt; dfaclsz = sizeof (aclent_t) * dfaclcnt; aclentp = cacl_realloc(aclentp, aclsz, aclsz + dfaclsz); if (aclentp != NULL) { (void) memcpy(aclentp + aclcnt, dfaclentp, dfaclsz); } else { error = ENOMEM; } } if (aclentp) { *retaclentp = aclentp; *retaclcnt = aclcnt + dfaclcnt; } if (dfaclentp) cacl_free(dfaclentp, dfaclsz); return (error); } int acl_translate(acl_t *aclp, int target_flavor, boolean_t isdir, uid_t owner, gid_t group) { int aclcnt; void *acldata; int error; /* * See if we need to translate */ if ((target_flavor == _ACL_ACE_ENABLED && aclp->acl_type == ACE_T) || (target_flavor == _ACL_ACLENT_ENABLED && aclp->acl_type == ACLENT_T)) return (0); if (target_flavor == -1) { error = EINVAL; goto out; } if (target_flavor == _ACL_ACE_ENABLED && aclp->acl_type == ACLENT_T) { error = convert_aent_to_ace(aclp->acl_aclp, aclp->acl_cnt, isdir, (ace_t **)&acldata, &aclcnt); if (error) goto out; } else if (target_flavor == _ACL_ACLENT_ENABLED && aclp->acl_type == ACE_T) { error = convert_ace_to_aent(aclp->acl_aclp, aclp->acl_cnt, isdir, owner, group, (aclent_t **)&acldata, &aclcnt); if (error) goto out; } else { error = ENOTSUP; goto out; } /* * replace old acl with newly translated acl */ cacl_free(aclp->acl_aclp, aclp->acl_cnt * aclp->acl_entry_size); aclp->acl_aclp = acldata; aclp->acl_cnt = aclcnt; if (target_flavor == _ACL_ACE_ENABLED) { aclp->acl_type = ACE_T; aclp->acl_entry_size = sizeof (ace_t); } else { aclp->acl_type = ACLENT_T; aclp->acl_entry_size = sizeof (aclent_t); } return (0); out: #if !defined(_KERNEL) errno = error; return (-1); #else return (error); #endif } #endif /* !_KERNEL */ #define SET_ACE(acl, index, who, mask, type, flags) { \ acl[0][index].a_who = (uint32_t)who; \ acl[0][index].a_type = type; \ acl[0][index].a_flags = flags; \ acl[0][index++].a_access_mask = mask; \ } void acl_trivial_access_masks(mode_t mode, boolean_t isdir, trivial_acl_t *masks) { uint32_t read_mask = ACE_READ_DATA; uint32_t write_mask = ACE_WRITE_DATA|ACE_APPEND_DATA; uint32_t execute_mask = ACE_EXECUTE; (void) isdir; /* will need this later */ masks->deny1 = 0; if (!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) masks->deny1 |= read_mask; if (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) masks->deny1 |= write_mask; if (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH))) masks->deny1 |= execute_mask; masks->deny2 = 0; if (!(mode & S_IRGRP) && (mode & S_IROTH)) masks->deny2 |= read_mask; if (!(mode & S_IWGRP) && (mode & S_IWOTH)) masks->deny2 |= write_mask; if (!(mode & S_IXGRP) && (mode & S_IXOTH)) masks->deny2 |= execute_mask; masks->allow0 = 0; if ((mode & S_IRUSR) && (!(mode & S_IRGRP) && (mode & S_IROTH))) masks->allow0 |= read_mask; if ((mode & S_IWUSR) && (!(mode & S_IWGRP) && (mode & S_IWOTH))) masks->allow0 |= write_mask; if ((mode & S_IXUSR) && (!(mode & S_IXGRP) && (mode & S_IXOTH))) masks->allow0 |= execute_mask; masks->owner = ACE_WRITE_ATTRIBUTES|ACE_WRITE_OWNER|ACE_WRITE_ACL| ACE_WRITE_NAMED_ATTRS|ACE_READ_ACL|ACE_READ_ATTRIBUTES| ACE_READ_NAMED_ATTRS|ACE_SYNCHRONIZE; if (mode & S_IRUSR) masks->owner |= read_mask; if (mode & S_IWUSR) masks->owner |= write_mask; if (mode & S_IXUSR) masks->owner |= execute_mask; masks->group = ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_READ_NAMED_ATTRS| ACE_SYNCHRONIZE; if (mode & S_IRGRP) masks->group |= read_mask; if (mode & S_IWGRP) masks->group |= write_mask; if (mode & S_IXGRP) masks->group |= execute_mask; masks->everyone = ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_READ_NAMED_ATTRS| ACE_SYNCHRONIZE; if (mode & S_IROTH) masks->everyone |= read_mask; if (mode & S_IWOTH) masks->everyone |= write_mask; if (mode & S_IXOTH) masks->everyone |= execute_mask; } int acl_trivial_create(mode_t mode, boolean_t isdir, ace_t **acl, int *count) { int index = 0; int error; trivial_acl_t masks; *count = 3; acl_trivial_access_masks(mode, isdir, &masks); if (masks.allow0) (*count)++; if (masks.deny1) (*count)++; if (masks.deny2) (*count)++; if ((error = cacl_malloc((void **)acl, *count * sizeof (ace_t))) != 0) return (error); if (masks.allow0) { SET_ACE(acl, index, -1, masks.allow0, ACE_ACCESS_ALLOWED_ACE_TYPE, ACE_OWNER); } if (masks.deny1) { SET_ACE(acl, index, -1, masks.deny1, ACE_ACCESS_DENIED_ACE_TYPE, ACE_OWNER); } if (masks.deny2) { SET_ACE(acl, index, -1, masks.deny2, ACE_ACCESS_DENIED_ACE_TYPE, ACE_GROUP|ACE_IDENTIFIER_GROUP); } SET_ACE(acl, index, -1, masks.owner, ACE_ACCESS_ALLOWED_ACE_TYPE, ACE_OWNER); SET_ACE(acl, index, -1, masks.group, ACE_ACCESS_ALLOWED_ACE_TYPE, ACE_IDENTIFIER_GROUP|ACE_GROUP); SET_ACE(acl, index, -1, masks.everyone, ACE_ACCESS_ALLOWED_ACE_TYPE, ACE_EVERYONE); return (0); } /* * ace_trivial: * determine whether an ace_t acl is trivial * * Trivialness implies that the acl is composed of only * owner, group, everyone entries. ACL can't * have read_acl denied, and write_owner/write_acl/write_attributes * can only be owner@ entry. */ int ace_trivial_common(void *acep, int aclcnt, uint64_t (*walk)(void *, uint64_t, int aclcnt, uint16_t *, uint16_t *, uint32_t *)) { uint16_t flags; uint32_t mask; uint16_t type; uint64_t cookie = 0; while ((cookie = walk(acep, cookie, aclcnt, &flags, &type, &mask))) { switch (flags & ACE_TYPE_FLAGS) { case ACE_OWNER: case ACE_GROUP|ACE_IDENTIFIER_GROUP: case ACE_EVERYONE: break; default: return (1); } if (flags & (ACE_FILE_INHERIT_ACE| ACE_DIRECTORY_INHERIT_ACE|ACE_NO_PROPAGATE_INHERIT_ACE| ACE_INHERIT_ONLY_ACE)) return (1); /* * Special check for some special bits * * Don't allow anybody to deny reading basic * attributes or a files ACL. */ if ((mask & (ACE_READ_ACL|ACE_READ_ATTRIBUTES)) && (type == ACE_ACCESS_DENIED_ACE_TYPE)) return (1); /* * Delete permissions are never set by default */ if (mask & (ACE_DELETE|ACE_DELETE_CHILD)) return (1); /* * only allow owner@ to have * write_acl/write_owner/write_attributes/write_xattr/ */ if (type == ACE_ACCESS_ALLOWED_ACE_TYPE && (!(flags & ACE_OWNER) && (mask & (ACE_WRITE_OWNER|ACE_WRITE_ACL| ACE_WRITE_ATTRIBUTES| ACE_WRITE_NAMED_ATTRS)))) return (1); } return (0); }