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954 lines
22 KiB
954 lines
22 KiB
/*
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* fs/nfs4acl/acl.c
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*
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* Common NFSv4 ACL handling code.
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*
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* Copyright (c) 2002, 2003 The Regents of the University of Michigan.
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* All rights reserved.
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*
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* Marius Aamodt Eriksen <marius@umich.edu>
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* Jeff Sedlak <jsedlak@umich.edu>
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* J. Bruce Fields <bfields@umich.edu>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/types.h>
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#include <linux/fs.h>
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#include <linux/module.h>
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#include <linux/nfs_fs.h>
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#include <linux/posix_acl.h>
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#include <linux/nfs4.h>
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#include <linux/nfs4_acl.h>
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/* mode bit translations: */
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#define NFS4_READ_MODE (NFS4_ACE_READ_DATA)
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#define NFS4_WRITE_MODE (NFS4_ACE_WRITE_DATA | NFS4_ACE_APPEND_DATA)
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#define NFS4_EXECUTE_MODE NFS4_ACE_EXECUTE
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#define NFS4_ANYONE_MODE (NFS4_ACE_READ_ATTRIBUTES | NFS4_ACE_READ_ACL | NFS4_ACE_SYNCHRONIZE)
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#define NFS4_OWNER_MODE (NFS4_ACE_WRITE_ATTRIBUTES | NFS4_ACE_WRITE_ACL)
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/* We don't support these bits; insist they be neither allowed nor denied */
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#define NFS4_MASK_UNSUPP (NFS4_ACE_DELETE | NFS4_ACE_WRITE_OWNER \
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| NFS4_ACE_READ_NAMED_ATTRS | NFS4_ACE_WRITE_NAMED_ATTRS)
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/* flags used to simulate posix default ACLs */
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#define NFS4_INHERITANCE_FLAGS (NFS4_ACE_FILE_INHERIT_ACE \
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| NFS4_ACE_DIRECTORY_INHERIT_ACE | NFS4_ACE_INHERIT_ONLY_ACE)
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#define MASK_EQUAL(mask1, mask2) \
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( ((mask1) & NFS4_ACE_MASK_ALL) == ((mask2) & NFS4_ACE_MASK_ALL) )
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static u32
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mask_from_posix(unsigned short perm, unsigned int flags)
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{
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int mask = NFS4_ANYONE_MODE;
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if (flags & NFS4_ACL_OWNER)
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mask |= NFS4_OWNER_MODE;
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if (perm & ACL_READ)
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mask |= NFS4_READ_MODE;
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if (perm & ACL_WRITE)
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mask |= NFS4_WRITE_MODE;
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if ((perm & ACL_WRITE) && (flags & NFS4_ACL_DIR))
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mask |= NFS4_ACE_DELETE_CHILD;
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if (perm & ACL_EXECUTE)
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mask |= NFS4_EXECUTE_MODE;
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return mask;
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}
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static u32
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deny_mask(u32 allow_mask, unsigned int flags)
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{
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u32 ret = ~allow_mask & ~NFS4_MASK_UNSUPP;
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if (!(flags & NFS4_ACL_DIR))
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ret &= ~NFS4_ACE_DELETE_CHILD;
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return ret;
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}
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/* XXX: modify functions to return NFS errors; they're only ever
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* used by nfs code, after all.... */
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static int
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mode_from_nfs4(u32 perm, unsigned short *mode, unsigned int flags)
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{
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u32 ignore = 0;
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if (!(flags & NFS4_ACL_DIR))
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ignore |= NFS4_ACE_DELETE_CHILD; /* ignore it */
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perm |= ignore;
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*mode = 0;
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if ((perm & NFS4_READ_MODE) == NFS4_READ_MODE)
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*mode |= ACL_READ;
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if ((perm & NFS4_WRITE_MODE) == NFS4_WRITE_MODE)
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*mode |= ACL_WRITE;
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if ((perm & NFS4_EXECUTE_MODE) == NFS4_EXECUTE_MODE)
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*mode |= ACL_EXECUTE;
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if (!MASK_EQUAL(perm, ignore|mask_from_posix(*mode, flags)))
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return -EINVAL;
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return 0;
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}
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struct ace_container {
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struct nfs4_ace *ace;
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struct list_head ace_l;
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};
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static short ace2type(struct nfs4_ace *);
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static int _posix_to_nfsv4_one(struct posix_acl *, struct nfs4_acl *, unsigned int);
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static struct posix_acl *_nfsv4_to_posix_one(struct nfs4_acl *, unsigned int);
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int nfs4_acl_add_ace(struct nfs4_acl *, u32, u32, u32, int, uid_t);
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static int nfs4_acl_split(struct nfs4_acl *, struct nfs4_acl *);
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struct nfs4_acl *
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nfs4_acl_posix_to_nfsv4(struct posix_acl *pacl, struct posix_acl *dpacl,
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unsigned int flags)
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{
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struct nfs4_acl *acl;
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int error = -EINVAL;
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if ((pacl != NULL &&
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(posix_acl_valid(pacl) < 0 || pacl->a_count == 0)) ||
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(dpacl != NULL &&
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(posix_acl_valid(dpacl) < 0 || dpacl->a_count == 0)))
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goto out_err;
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acl = nfs4_acl_new();
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if (acl == NULL) {
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error = -ENOMEM;
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goto out_err;
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}
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if (pacl != NULL) {
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error = _posix_to_nfsv4_one(pacl, acl,
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flags & ~NFS4_ACL_TYPE_DEFAULT);
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if (error < 0)
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goto out_acl;
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}
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if (dpacl != NULL) {
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error = _posix_to_nfsv4_one(dpacl, acl,
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flags | NFS4_ACL_TYPE_DEFAULT);
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if (error < 0)
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goto out_acl;
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}
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return acl;
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out_acl:
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nfs4_acl_free(acl);
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out_err:
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acl = ERR_PTR(error);
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return acl;
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}
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static int
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nfs4_acl_add_pair(struct nfs4_acl *acl, int eflag, u32 mask, int whotype,
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uid_t owner, unsigned int flags)
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{
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int error;
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error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE,
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eflag, mask, whotype, owner);
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if (error < 0)
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return error;
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error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
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eflag, deny_mask(mask, flags), whotype, owner);
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return error;
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}
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/* We assume the acl has been verified with posix_acl_valid. */
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static int
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_posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl,
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unsigned int flags)
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{
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struct posix_acl_entry *pa, *pe, *group_owner_entry;
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int error = -EINVAL;
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u32 mask, mask_mask;
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int eflag = ((flags & NFS4_ACL_TYPE_DEFAULT) ?
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NFS4_INHERITANCE_FLAGS : 0);
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BUG_ON(pacl->a_count < 3);
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pe = pacl->a_entries + pacl->a_count;
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pa = pe - 2; /* if mask entry exists, it's second from the last. */
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if (pa->e_tag == ACL_MASK)
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mask_mask = deny_mask(mask_from_posix(pa->e_perm, flags), flags);
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else
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mask_mask = 0;
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pa = pacl->a_entries;
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BUG_ON(pa->e_tag != ACL_USER_OBJ);
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mask = mask_from_posix(pa->e_perm, flags | NFS4_ACL_OWNER);
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error = nfs4_acl_add_pair(acl, eflag, mask, NFS4_ACL_WHO_OWNER, 0, flags);
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if (error < 0)
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goto out;
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pa++;
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while (pa->e_tag == ACL_USER) {
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mask = mask_from_posix(pa->e_perm, flags);
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error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
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eflag, mask_mask, NFS4_ACL_WHO_NAMED, pa->e_id);
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if (error < 0)
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goto out;
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error = nfs4_acl_add_pair(acl, eflag, mask,
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NFS4_ACL_WHO_NAMED, pa->e_id, flags);
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if (error < 0)
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goto out;
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pa++;
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}
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/* In the case of groups, we apply allow ACEs first, then deny ACEs,
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* since a user can be in more than one group. */
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/* allow ACEs */
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if (pacl->a_count > 3) {
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BUG_ON(pa->e_tag != ACL_GROUP_OBJ);
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error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
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NFS4_ACE_IDENTIFIER_GROUP | eflag, mask_mask,
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NFS4_ACL_WHO_GROUP, 0);
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if (error < 0)
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goto out;
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}
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group_owner_entry = pa;
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mask = mask_from_posix(pa->e_perm, flags);
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error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE,
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NFS4_ACE_IDENTIFIER_GROUP | eflag, mask,
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NFS4_ACL_WHO_GROUP, 0);
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if (error < 0)
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goto out;
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pa++;
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while (pa->e_tag == ACL_GROUP) {
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mask = mask_from_posix(pa->e_perm, flags);
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error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
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NFS4_ACE_IDENTIFIER_GROUP | eflag, mask_mask,
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NFS4_ACL_WHO_NAMED, pa->e_id);
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if (error < 0)
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goto out;
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error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE,
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NFS4_ACE_IDENTIFIER_GROUP | eflag, mask,
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NFS4_ACL_WHO_NAMED, pa->e_id);
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if (error < 0)
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goto out;
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pa++;
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}
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/* deny ACEs */
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pa = group_owner_entry;
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mask = mask_from_posix(pa->e_perm, flags);
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error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
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NFS4_ACE_IDENTIFIER_GROUP | eflag,
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deny_mask(mask, flags), NFS4_ACL_WHO_GROUP, 0);
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if (error < 0)
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goto out;
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pa++;
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while (pa->e_tag == ACL_GROUP) {
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mask = mask_from_posix(pa->e_perm, flags);
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error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
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NFS4_ACE_IDENTIFIER_GROUP | eflag,
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deny_mask(mask, flags), NFS4_ACL_WHO_NAMED, pa->e_id);
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if (error < 0)
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goto out;
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pa++;
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}
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if (pa->e_tag == ACL_MASK)
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pa++;
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BUG_ON(pa->e_tag != ACL_OTHER);
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mask = mask_from_posix(pa->e_perm, flags);
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error = nfs4_acl_add_pair(acl, eflag, mask, NFS4_ACL_WHO_EVERYONE, 0, flags);
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out:
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return error;
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}
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static void
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sort_pacl_range(struct posix_acl *pacl, int start, int end) {
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int sorted = 0, i;
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struct posix_acl_entry tmp;
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/* We just do a bubble sort; easy to do in place, and we're not
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* expecting acl's to be long enough to justify anything more. */
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while (!sorted) {
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sorted = 1;
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for (i = start; i < end; i++) {
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if (pacl->a_entries[i].e_id
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> pacl->a_entries[i+1].e_id) {
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sorted = 0;
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tmp = pacl->a_entries[i];
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pacl->a_entries[i] = pacl->a_entries[i+1];
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pacl->a_entries[i+1] = tmp;
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}
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}
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}
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}
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static void
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sort_pacl(struct posix_acl *pacl)
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{
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/* posix_acl_valid requires that users and groups be in order
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* by uid/gid. */
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int i, j;
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if (pacl->a_count <= 4)
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return; /* no users or groups */
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i = 1;
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while (pacl->a_entries[i].e_tag == ACL_USER)
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i++;
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sort_pacl_range(pacl, 1, i-1);
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BUG_ON(pacl->a_entries[i].e_tag != ACL_GROUP_OBJ);
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j = i++;
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while (pacl->a_entries[j].e_tag == ACL_GROUP)
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j++;
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sort_pacl_range(pacl, i, j-1);
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return;
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}
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static int
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write_pace(struct nfs4_ace *ace, struct posix_acl *pacl,
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struct posix_acl_entry **pace, short tag, unsigned int flags)
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{
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struct posix_acl_entry *this = *pace;
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if (*pace == pacl->a_entries + pacl->a_count)
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return -EINVAL; /* fell off the end */
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(*pace)++;
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this->e_tag = tag;
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if (tag == ACL_USER_OBJ)
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flags |= NFS4_ACL_OWNER;
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if (mode_from_nfs4(ace->access_mask, &this->e_perm, flags))
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return -EINVAL;
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this->e_id = (tag == ACL_USER || tag == ACL_GROUP ?
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ace->who : ACL_UNDEFINED_ID);
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return 0;
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}
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static struct nfs4_ace *
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get_next_v4_ace(struct list_head **p, struct list_head *head)
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{
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struct nfs4_ace *ace;
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*p = (*p)->next;
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if (*p == head)
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return NULL;
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ace = list_entry(*p, struct nfs4_ace, l_ace);
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return ace;
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}
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int
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nfs4_acl_nfsv4_to_posix(struct nfs4_acl *acl, struct posix_acl **pacl,
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struct posix_acl **dpacl, unsigned int flags)
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{
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struct nfs4_acl *dacl;
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int error = -ENOMEM;
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*pacl = NULL;
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*dpacl = NULL;
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dacl = nfs4_acl_new();
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if (dacl == NULL)
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goto out;
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error = nfs4_acl_split(acl, dacl);
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if (error < 0)
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goto out_acl;
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if (pacl != NULL) {
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if (acl->naces == 0) {
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error = -ENODATA;
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goto try_dpacl;
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}
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*pacl = _nfsv4_to_posix_one(acl, flags);
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if (IS_ERR(*pacl)) {
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error = PTR_ERR(*pacl);
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*pacl = NULL;
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goto out_acl;
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}
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}
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try_dpacl:
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if (dpacl != NULL) {
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if (dacl->naces == 0) {
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if (pacl == NULL || *pacl == NULL)
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error = -ENODATA;
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goto out_acl;
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}
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error = 0;
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*dpacl = _nfsv4_to_posix_one(dacl, flags);
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if (IS_ERR(*dpacl)) {
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error = PTR_ERR(*dpacl);
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*dpacl = NULL;
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goto out_acl;
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}
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}
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out_acl:
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if (error && pacl) {
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posix_acl_release(*pacl);
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*pacl = NULL;
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}
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nfs4_acl_free(dacl);
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out:
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return error;
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}
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|
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static int
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same_who(struct nfs4_ace *a, struct nfs4_ace *b)
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{
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return a->whotype == b->whotype &&
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(a->whotype != NFS4_ACL_WHO_NAMED || a->who == b->who);
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}
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|
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static int
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complementary_ace_pair(struct nfs4_ace *allow, struct nfs4_ace *deny,
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unsigned int flags)
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{
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int ignore = 0;
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if (!(flags & NFS4_ACL_DIR))
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ignore |= NFS4_ACE_DELETE_CHILD;
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return MASK_EQUAL(ignore|deny_mask(allow->access_mask, flags),
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ignore|deny->access_mask) &&
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allow->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE &&
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deny->type == NFS4_ACE_ACCESS_DENIED_ACE_TYPE &&
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allow->flag == deny->flag &&
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same_who(allow, deny);
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}
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static inline int
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user_obj_from_v4(struct nfs4_acl *n4acl, struct list_head **p,
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struct posix_acl *pacl, struct posix_acl_entry **pace,
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unsigned int flags)
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{
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int error = -EINVAL;
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struct nfs4_ace *ace, *ace2;
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ace = get_next_v4_ace(p, &n4acl->ace_head);
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if (ace == NULL)
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goto out;
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if (ace2type(ace) != ACL_USER_OBJ)
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goto out;
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error = write_pace(ace, pacl, pace, ACL_USER_OBJ, flags);
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if (error < 0)
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goto out;
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error = -EINVAL;
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ace2 = get_next_v4_ace(p, &n4acl->ace_head);
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if (ace2 == NULL)
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goto out;
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if (!complementary_ace_pair(ace, ace2, flags))
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goto out;
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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 < ARRAY_SIZE(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 < ARRAY_SIZE(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);
|
|
|