/* * fs/nfs4acl/acl.c * * Common NFSv4 ACL handling code. * * Copyright (c) 2002, 2003 The Regents of the University of Michigan. * All rights reserved. * * Marius Aamodt Eriksen * Jeff Sedlak * J. Bruce Fields * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include #include /* mode bit translations: */ #define NFS4_READ_MODE (NFS4_ACE_READ_DATA) #define NFS4_WRITE_MODE (NFS4_ACE_WRITE_DATA | NFS4_ACE_APPEND_DATA) #define NFS4_EXECUTE_MODE NFS4_ACE_EXECUTE #define NFS4_ANYONE_MODE (NFS4_ACE_READ_ATTRIBUTES | NFS4_ACE_READ_ACL | NFS4_ACE_SYNCHRONIZE) #define NFS4_OWNER_MODE (NFS4_ACE_WRITE_ATTRIBUTES | NFS4_ACE_WRITE_ACL) /* We don't support these bits; insist they be neither allowed nor denied */ #define NFS4_MASK_UNSUPP (NFS4_ACE_DELETE | NFS4_ACE_WRITE_OWNER \ | NFS4_ACE_READ_NAMED_ATTRS | NFS4_ACE_WRITE_NAMED_ATTRS) /* flags used to simulate posix default ACLs */ #define NFS4_INHERITANCE_FLAGS (NFS4_ACE_FILE_INHERIT_ACE \ | NFS4_ACE_DIRECTORY_INHERIT_ACE | NFS4_ACE_INHERIT_ONLY_ACE) #define MASK_EQUAL(mask1, mask2) \ ( ((mask1) & NFS4_ACE_MASK_ALL) == ((mask2) & NFS4_ACE_MASK_ALL) ) static u32 mask_from_posix(unsigned short perm, unsigned int flags) { int mask = NFS4_ANYONE_MODE; if (flags & NFS4_ACL_OWNER) mask |= NFS4_OWNER_MODE; if (perm & ACL_READ) mask |= NFS4_READ_MODE; if (perm & ACL_WRITE) mask |= NFS4_WRITE_MODE; if ((perm & ACL_WRITE) && (flags & NFS4_ACL_DIR)) mask |= NFS4_ACE_DELETE_CHILD; if (perm & ACL_EXECUTE) mask |= NFS4_EXECUTE_MODE; return mask; } static u32 deny_mask(u32 allow_mask, unsigned int flags) { u32 ret = ~allow_mask & ~NFS4_MASK_UNSUPP; if (!(flags & NFS4_ACL_DIR)) ret &= ~NFS4_ACE_DELETE_CHILD; return ret; } /* XXX: modify functions to return NFS errors; they're only ever * used by nfs code, after all.... */ static int mode_from_nfs4(u32 perm, unsigned short *mode, unsigned int flags) { u32 ignore = 0; if (!(flags & NFS4_ACL_DIR)) ignore |= NFS4_ACE_DELETE_CHILD; /* ignore it */ perm |= ignore; *mode = 0; if ((perm & NFS4_READ_MODE) == NFS4_READ_MODE) *mode |= ACL_READ; if ((perm & NFS4_WRITE_MODE) == NFS4_WRITE_MODE) *mode |= ACL_WRITE; if ((perm & NFS4_EXECUTE_MODE) == NFS4_EXECUTE_MODE) *mode |= ACL_EXECUTE; if (!MASK_EQUAL(perm, ignore|mask_from_posix(*mode, flags))) return -EINVAL; return 0; } struct ace_container { struct nfs4_ace *ace; struct list_head ace_l; }; static short ace2type(struct nfs4_ace *); static int _posix_to_nfsv4_one(struct posix_acl *, struct nfs4_acl *, unsigned int); static struct posix_acl *_nfsv4_to_posix_one(struct nfs4_acl *, unsigned int); int nfs4_acl_add_ace(struct nfs4_acl *, u32, u32, u32, int, uid_t); static int nfs4_acl_split(struct nfs4_acl *, struct nfs4_acl *); struct nfs4_acl * nfs4_acl_posix_to_nfsv4(struct posix_acl *pacl, struct posix_acl *dpacl, unsigned int flags) { struct nfs4_acl *acl; int error = -EINVAL; if ((pacl != NULL && (posix_acl_valid(pacl) < 0 || pacl->a_count == 0)) || (dpacl != NULL && (posix_acl_valid(dpacl) < 0 || dpacl->a_count == 0))) goto out_err; acl = nfs4_acl_new(); if (acl == NULL) { error = -ENOMEM; goto out_err; } if (pacl != NULL) { error = _posix_to_nfsv4_one(pacl, acl, flags & ~NFS4_ACL_TYPE_DEFAULT); if (error < 0) goto out_acl; } if (dpacl != NULL) { error = _posix_to_nfsv4_one(dpacl, acl, flags | NFS4_ACL_TYPE_DEFAULT); if (error < 0) goto out_acl; } return acl; out_acl: nfs4_acl_free(acl); out_err: acl = ERR_PTR(error); return acl; } static int nfs4_acl_add_pair(struct nfs4_acl *acl, int eflag, u32 mask, int whotype, uid_t owner, unsigned int flags) { int error; error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE, eflag, mask, whotype, owner); if (error < 0) return error; error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE, eflag, deny_mask(mask, flags), whotype, owner); return error; } /* We assume the acl has been verified with posix_acl_valid. */ static int _posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl, unsigned int flags) { struct posix_acl_entry *pa, *pe, *group_owner_entry; int error = -EINVAL; u32 mask, mask_mask; int eflag = ((flags & NFS4_ACL_TYPE_DEFAULT) ? NFS4_INHERITANCE_FLAGS : 0); BUG_ON(pacl->a_count < 3); pe = pacl->a_entries + pacl->a_count; pa = pe - 2; /* if mask entry exists, it's second from the last. */ if (pa->e_tag == ACL_MASK) mask_mask = deny_mask(mask_from_posix(pa->e_perm, flags), flags); else mask_mask = 0; pa = pacl->a_entries; BUG_ON(pa->e_tag != ACL_USER_OBJ); mask = mask_from_posix(pa->e_perm, flags | NFS4_ACL_OWNER); error = nfs4_acl_add_pair(acl, eflag, mask, NFS4_ACL_WHO_OWNER, 0, flags); if (error < 0) goto out; pa++; while (pa->e_tag == ACL_USER) { mask = mask_from_posix(pa->e_perm, flags); error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE, eflag, mask_mask, NFS4_ACL_WHO_NAMED, pa->e_id); if (error < 0) goto out; error = nfs4_acl_add_pair(acl, eflag, mask, NFS4_ACL_WHO_NAMED, pa->e_id, flags); if (error < 0) goto out; pa++; } /* In the case of groups, we apply allow ACEs first, then deny ACEs, * since a user can be in more than one group. */ /* allow ACEs */ if (pacl->a_count > 3) { BUG_ON(pa->e_tag != ACL_GROUP_OBJ); error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE, NFS4_ACE_IDENTIFIER_GROUP | eflag, mask_mask, NFS4_ACL_WHO_GROUP, 0); if (error < 0) goto out; } group_owner_entry = pa; mask = mask_from_posix(pa->e_perm, flags); error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE, NFS4_ACE_IDENTIFIER_GROUP | eflag, mask, NFS4_ACL_WHO_GROUP, 0); if (error < 0) goto out; pa++; while (pa->e_tag == ACL_GROUP) { mask = mask_from_posix(pa->e_perm, flags); error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE, NFS4_ACE_IDENTIFIER_GROUP | eflag, mask_mask, NFS4_ACL_WHO_NAMED, pa->e_id); if (error < 0) goto out; error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE, NFS4_ACE_IDENTIFIER_GROUP | eflag, mask, NFS4_ACL_WHO_NAMED, pa->e_id); if (error < 0) goto out; pa++; } /* deny ACEs */ pa = group_owner_entry; mask = mask_from_posix(pa->e_perm, flags); error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE, NFS4_ACE_IDENTIFIER_GROUP | eflag, deny_mask(mask, flags), NFS4_ACL_WHO_GROUP, 0); if (error < 0) goto out; pa++; while (pa->e_tag == ACL_GROUP) { mask = mask_from_posix(pa->e_perm, flags); error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE, NFS4_ACE_IDENTIFIER_GROUP | eflag, deny_mask(mask, flags), NFS4_ACL_WHO_NAMED, pa->e_id); if (error < 0) goto out; pa++; } if (pa->e_tag == ACL_MASK) pa++; BUG_ON(pa->e_tag != ACL_OTHER); mask = mask_from_posix(pa->e_perm, flags); error = nfs4_acl_add_pair(acl, eflag, mask, NFS4_ACL_WHO_EVERYONE, 0, flags); out: return error; } static void sort_pacl_range(struct posix_acl *pacl, int start, int end) { int sorted = 0, i; struct posix_acl_entry tmp; /* We just do a bubble sort; easy to do in place, and we're not * expecting acl's to be long enough to justify anything more. */ while (!sorted) { sorted = 1; for (i = start; i < end; i++) { if (pacl->a_entries[i].e_id > pacl->a_entries[i+1].e_id) { sorted = 0; tmp = pacl->a_entries[i]; pacl->a_entries[i] = pacl->a_entries[i+1]; pacl->a_entries[i+1] = tmp; } } } } static void sort_pacl(struct posix_acl *pacl) { /* posix_acl_valid requires that users and groups be in order * by uid/gid. */ int i, j; if (pacl->a_count <= 4) return; /* no users or groups */ i = 1; while (pacl->a_entries[i].e_tag == ACL_USER) i++; sort_pacl_range(pacl, 1, i-1); BUG_ON(pacl->a_entries[i].e_tag != ACL_GROUP_OBJ); j = i++; while (pacl->a_entries[j].e_tag == ACL_GROUP) j++; sort_pacl_range(pacl, i, j-1); return; } static int write_pace(struct nfs4_ace *ace, struct posix_acl *pacl, struct posix_acl_entry **pace, short tag, unsigned int flags) { struct posix_acl_entry *this = *pace; if (*pace == pacl->a_entries + pacl->a_count) return -EINVAL; /* fell off the end */ (*pace)++; this->e_tag = tag; if (tag == ACL_USER_OBJ) flags |= NFS4_ACL_OWNER; if (mode_from_nfs4(ace->access_mask, &this->e_perm, flags)) return -EINVAL; this->e_id = (tag == ACL_USER || tag == ACL_GROUP ? ace->who : ACL_UNDEFINED_ID); return 0; } static struct nfs4_ace * get_next_v4_ace(struct list_head **p, struct list_head *head) { struct nfs4_ace *ace; *p = (*p)->next; if (*p == head) return NULL; ace = list_entry(*p, struct nfs4_ace, l_ace); return ace; } int nfs4_acl_nfsv4_to_posix(struct nfs4_acl *acl, struct posix_acl **pacl, struct posix_acl **dpacl, unsigned int flags) { struct nfs4_acl *dacl; int error = -ENOMEM; *pacl = NULL; *dpacl = NULL; dacl = nfs4_acl_new(); if (dacl == NULL) goto out; error = nfs4_acl_split(acl, dacl); if (error < 0) goto out_acl; if (pacl != NULL) { if (acl->naces == 0) { error = -ENODATA; goto try_dpacl; } *pacl = _nfsv4_to_posix_one(acl, flags); if (IS_ERR(*pacl)) { error = PTR_ERR(*pacl); *pacl = NULL; goto out_acl; } } try_dpacl: if (dpacl != NULL) { if (dacl->naces == 0) { if (pacl == NULL || *pacl == NULL) error = -ENODATA; goto out_acl; } error = 0; *dpacl = _nfsv4_to_posix_one(dacl, flags); if (IS_ERR(*dpacl)) { error = PTR_ERR(*dpacl); *dpacl = NULL; goto out_acl; } } out_acl: if (error && pacl) { posix_acl_release(*pacl); *pacl = NULL; } nfs4_acl_free(dacl); out: return error; } static int same_who(struct nfs4_ace *a, struct nfs4_ace *b) { return a->whotype == b->whotype && (a->whotype != NFS4_ACL_WHO_NAMED || a->who == b->who); } static int complementary_ace_pair(struct nfs4_ace *allow, struct nfs4_ace *deny, unsigned int flags) { int ignore = 0; if (!(flags & NFS4_ACL_DIR)) ignore |= NFS4_ACE_DELETE_CHILD; return MASK_EQUAL(ignore|deny_mask(allow->access_mask, flags), ignore|deny->access_mask) && allow->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE && deny->type == NFS4_ACE_ACCESS_DENIED_ACE_TYPE && allow->flag == deny->flag && same_who(allow, deny); } static inline int user_obj_from_v4(struct nfs4_acl *n4acl, struct list_head **p, struct posix_acl *pacl, struct posix_acl_entry **pace, unsigned int flags) { int error = -EINVAL; struct nfs4_ace *ace, *ace2; ace = get_next_v4_ace(p, &n4acl->ace_head); if (ace == NULL) goto out; if (ace2type(ace) != ACL_USER_OBJ) goto out; error = write_pace(ace, pacl, pace, ACL_USER_OBJ, flags); if (error < 0) goto out; error = -EINVAL; ace2 = get_next_v4_ace(p, &n4acl->ace_head); if (ace2 == NULL) goto out; if (!complementary_ace_pair(ace, ace2, flags)) goto out; error = 0; out: return error; } static inline int users_from_v4(struct nfs4_acl *n4acl, struct list_head **p, struct nfs4_ace **mask_ace, struct posix_acl *pacl, struct posix_acl_entry **pace, unsigned int flags) { int error = -EINVAL; struct nfs4_ace *ace, *ace2; ace = get_next_v4_ace(p, &n4acl->ace_head); if (ace == NULL) goto out; while (ace2type(ace) == ACL_USER) { if (ace->type != NFS4_ACE_ACCESS_DENIED_ACE_TYPE) goto out; if (*mask_ace && !MASK_EQUAL(ace->access_mask, (*mask_ace)->access_mask)) goto out; *mask_ace = ace; ace = get_next_v4_ace(p, &n4acl->ace_head); if (ace == NULL) goto out; if (ace->type != NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) goto out; error = write_pace(ace, pacl, pace, ACL_USER, flags); if (error < 0) goto out; error = -EINVAL; ace2 = get_next_v4_ace(p, &n4acl->ace_head); if (ace2 == NULL) goto out; if (!complementary_ace_pair(ace, ace2, flags)) goto out; if ((*mask_ace)->flag != ace2->flag || !same_who(*mask_ace, ace2)) goto out; ace = get_next_v4_ace(p, &n4acl->ace_head); if (ace == NULL) goto out; } error = 0; out: return error; } static inline int group_obj_and_groups_from_v4(struct nfs4_acl *n4acl, struct list_head **p, struct nfs4_ace **mask_ace, struct posix_acl *pacl, struct posix_acl_entry **pace, unsigned int flags) { int error = -EINVAL; struct nfs4_ace *ace, *ace2; struct ace_container *ac; struct list_head group_l; INIT_LIST_HEAD(&group_l); ace = list_entry(*p, struct nfs4_ace, l_ace); /* group owner (mask and allow aces) */ if (pacl->a_count != 3) { /* then the group owner should be preceded by mask */ if (ace->type != NFS4_ACE_ACCESS_DENIED_ACE_TYPE) goto out; if (*mask_ace && !MASK_EQUAL(ace->access_mask, (*mask_ace)->access_mask)) goto out; *mask_ace = ace; ace = get_next_v4_ace(p, &n4acl->ace_head); if (ace == NULL) goto out; if ((*mask_ace)->flag != ace->flag || !same_who(*mask_ace, ace)) goto out; } if (ace2type(ace) != ACL_GROUP_OBJ) goto out; ac = kmalloc(sizeof(*ac), GFP_KERNEL); error = -ENOMEM; if (ac == NULL) goto out; ac->ace = ace; list_add_tail(&ac->ace_l, &group_l); error = -EINVAL; if (ace->type != NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) goto out; error = write_pace(ace, pacl, pace, ACL_GROUP_OBJ, flags); if (error < 0) goto out; error = -EINVAL; ace = get_next_v4_ace(p, &n4acl->ace_head); if (ace == NULL) goto out; /* groups (mask and allow aces) */ while (ace2type(ace) == ACL_GROUP) { if (*mask_ace == NULL) goto out; if (ace->type != NFS4_ACE_ACCESS_DENIED_ACE_TYPE || !MASK_EQUAL(ace->access_mask, (*mask_ace)->access_mask)) goto out; *mask_ace = ace; ace = get_next_v4_ace(p, &n4acl->ace_head); if (ace == NULL) goto out; ac = kmalloc(sizeof(*ac), GFP_KERNEL); error = -ENOMEM; if (ac == NULL) goto out; error = -EINVAL; if (ace->type != NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE || !same_who(ace, *mask_ace)) goto out; ac->ace = ace; list_add_tail(&ac->ace_l, &group_l); error = write_pace(ace, pacl, pace, ACL_GROUP, flags); if (error < 0) goto out; error = -EINVAL; ace = get_next_v4_ace(p, &n4acl->ace_head); if (ace == NULL) goto out; } /* group owner (deny ace) */ if (ace2type(ace) != ACL_GROUP_OBJ) goto out; ac = list_entry(group_l.next, struct ace_container, ace_l); ace2 = ac->ace; if (!complementary_ace_pair(ace2, ace, flags)) goto out; list_del(group_l.next); kfree(ac); /* groups (deny aces) */ while (!list_empty(&group_l)) { ace = get_next_v4_ace(p, &n4acl->ace_head); if (ace == NULL) goto out; if (ace2type(ace) != ACL_GROUP) goto out; ac = list_entry(group_l.next, struct ace_container, ace_l); ace2 = ac->ace; if (!complementary_ace_pair(ace2, ace, flags)) goto out; list_del(group_l.next); kfree(ac); } ace = get_next_v4_ace(p, &n4acl->ace_head); if (ace == NULL) goto out; if (ace2type(ace) != ACL_OTHER) goto out; error = 0; out: while (!list_empty(&group_l)) { ac = list_entry(group_l.next, struct ace_container, ace_l); list_del(group_l.next); kfree(ac); } return error; } static inline int mask_from_v4(struct nfs4_acl *n4acl, struct list_head **p, struct nfs4_ace **mask_ace, struct posix_acl *pacl, struct posix_acl_entry **pace, unsigned int flags) { int error = -EINVAL; struct nfs4_ace *ace; ace = list_entry(*p, struct nfs4_ace, l_ace); if (pacl->a_count != 3) { if (*mask_ace == NULL) goto out; (*mask_ace)->access_mask = deny_mask((*mask_ace)->access_mask, flags); write_pace(*mask_ace, pacl, pace, ACL_MASK, flags); } error = 0; out: return error; } static inline int other_from_v4(struct nfs4_acl *n4acl, struct list_head **p, struct posix_acl *pacl, struct posix_acl_entry **pace, unsigned int flags) { int error = -EINVAL; struct nfs4_ace *ace, *ace2; ace = list_entry(*p, struct nfs4_ace, l_ace); if (ace->type != NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) goto out; error = write_pace(ace, pacl, pace, ACL_OTHER, flags); if (error < 0) goto out; error = -EINVAL; ace2 = get_next_v4_ace(p, &n4acl->ace_head); if (ace2 == NULL) goto out; if (!complementary_ace_pair(ace, ace2, flags)) goto out; error = 0; out: return error; } static int calculate_posix_ace_count(struct nfs4_acl *n4acl) { if (n4acl->naces == 6) /* owner, owner group, and other only */ return 3; else { /* Otherwise there must be a mask entry. */ /* Also, the remaining entries are for named users and * groups, and come in threes (mask, allow, deny): */ if (n4acl->naces < 7) return -1; if ((n4acl->naces - 7) % 3) return -1; return 4 + (n4acl->naces - 7)/3; } } static struct posix_acl * _nfsv4_to_posix_one(struct nfs4_acl *n4acl, unsigned int flags) { struct posix_acl *pacl; int error = -EINVAL, nace = 0; struct list_head *p; struct nfs4_ace *mask_ace = NULL; struct posix_acl_entry *pace; nace = calculate_posix_ace_count(n4acl); if (nace < 0) goto out_err; pacl = posix_acl_alloc(nace, GFP_KERNEL); error = -ENOMEM; if (pacl == NULL) goto out_err; pace = &pacl->a_entries[0]; p = &n4acl->ace_head; error = user_obj_from_v4(n4acl, &p, pacl, &pace, flags); if (error) goto out_acl; error = users_from_v4(n4acl, &p, &mask_ace, pacl, &pace, flags); if (error) goto out_acl; error = group_obj_and_groups_from_v4(n4acl, &p, &mask_ace, pacl, &pace, flags); if (error) goto out_acl; error = mask_from_v4(n4acl, &p, &mask_ace, pacl, &pace, flags); if (error) goto out_acl; error = other_from_v4(n4acl, &p, pacl, &pace, flags); if (error) goto out_acl; error = -EINVAL; if (p->next != &n4acl->ace_head) goto out_acl; if (pace != pacl->a_entries + pacl->a_count) goto out_acl; sort_pacl(pacl); return pacl; out_acl: posix_acl_release(pacl); out_err: pacl = ERR_PTR(error); return pacl; } static int nfs4_acl_split(struct nfs4_acl *acl, struct nfs4_acl *dacl) { struct list_head *h, *n; struct nfs4_ace *ace; int error = 0; list_for_each_safe(h, n, &acl->ace_head) { ace = list_entry(h, struct nfs4_ace, l_ace); if ((ace->flag & NFS4_INHERITANCE_FLAGS) != NFS4_INHERITANCE_FLAGS) continue; error = nfs4_acl_add_ace(dacl, ace->type, ace->flag, ace->access_mask, ace->whotype, ace->who) == -1; if (error < 0) goto out; list_del(h); kfree(ace); acl->naces--; } out: return error; } static short ace2type(struct nfs4_ace *ace) { switch (ace->whotype) { case NFS4_ACL_WHO_NAMED: return (ace->flag & NFS4_ACE_IDENTIFIER_GROUP ? ACL_GROUP : ACL_USER); case NFS4_ACL_WHO_OWNER: return ACL_USER_OBJ; case NFS4_ACL_WHO_GROUP: return ACL_GROUP_OBJ; case NFS4_ACL_WHO_EVERYONE: return ACL_OTHER; } BUG(); return -1; } EXPORT_SYMBOL(nfs4_acl_posix_to_nfsv4); EXPORT_SYMBOL(nfs4_acl_nfsv4_to_posix); struct nfs4_acl * nfs4_acl_new(void) { struct nfs4_acl *acl; if ((acl = kmalloc(sizeof(*acl), GFP_KERNEL)) == NULL) return NULL; acl->naces = 0; INIT_LIST_HEAD(&acl->ace_head); return acl; } void nfs4_acl_free(struct nfs4_acl *acl) { struct list_head *h; struct nfs4_ace *ace; if (!acl) return; while (!list_empty(&acl->ace_head)) { h = acl->ace_head.next; list_del(h); ace = list_entry(h, struct nfs4_ace, l_ace); kfree(ace); } kfree(acl); return; } int nfs4_acl_add_ace(struct nfs4_acl *acl, u32 type, u32 flag, u32 access_mask, int whotype, uid_t who) { struct nfs4_ace *ace; if ((ace = kmalloc(sizeof(*ace), GFP_KERNEL)) == NULL) return -1; ace->type = type; ace->flag = flag; ace->access_mask = access_mask; ace->whotype = whotype; ace->who = who; list_add_tail(&ace->l_ace, &acl->ace_head); acl->naces++; return 0; } static struct { char *string; int stringlen; int type; } s2t_map[] = { { .string = "OWNER@", .stringlen = sizeof("OWNER@") - 1, .type = NFS4_ACL_WHO_OWNER, }, { .string = "GROUP@", .stringlen = sizeof("GROUP@") - 1, .type = NFS4_ACL_WHO_GROUP, }, { .string = "EVERYONE@", .stringlen = sizeof("EVERYONE@") - 1, .type = NFS4_ACL_WHO_EVERYONE, }, }; int nfs4_acl_get_whotype(char *p, u32 len) { int i; for (i=0; i < sizeof(s2t_map) / sizeof(*s2t_map); i++) { if (s2t_map[i].stringlen == len && 0 == memcmp(s2t_map[i].string, p, len)) return s2t_map[i].type; } return NFS4_ACL_WHO_NAMED; } int nfs4_acl_write_who(int who, char *p) { int i; for (i=0; i < sizeof(s2t_map) / sizeof(*s2t_map); i++) { if (s2t_map[i].type == who) { memcpy(p, s2t_map[i].string, s2t_map[i].stringlen); return s2t_map[i].stringlen; } } BUG(); return -1; } static inline int match_who(struct nfs4_ace *ace, uid_t owner, gid_t group, uid_t who) { switch (ace->whotype) { case NFS4_ACL_WHO_NAMED: return who == ace->who; case NFS4_ACL_WHO_OWNER: return who == owner; case NFS4_ACL_WHO_GROUP: return who == group; case NFS4_ACL_WHO_EVERYONE: return 1; default: return 0; } } EXPORT_SYMBOL(nfs4_acl_new); EXPORT_SYMBOL(nfs4_acl_free); EXPORT_SYMBOL(nfs4_acl_add_ace); EXPORT_SYMBOL(nfs4_acl_get_whotype); EXPORT_SYMBOL(nfs4_acl_write_who);