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885 lines
22 KiB
885 lines
22 KiB
/* |
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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 <[email protected]> |
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* Jeff Sedlak <[email protected]> |
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* J. Bruce Fields <[email protected]> |
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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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|
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#include <linux/fs.h> |
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#include <linux/slab.h> |
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#include <linux/posix_acl.h> |
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|
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#include "nfsfh.h" |
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#include "nfsd.h" |
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#include "acl.h" |
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#include "vfs.h" |
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|
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#define NFS4_ACL_TYPE_DEFAULT 0x01 |
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#define NFS4_ACL_DIR 0x02 |
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#define NFS4_ACL_OWNER 0x04 |
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|
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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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|
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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) |
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|
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#define NFS4_SUPPORTED_FLAGS (NFS4_INHERITANCE_FLAGS \ |
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| NFS4_ACE_INHERIT_ONLY_ACE \ |
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| NFS4_ACE_IDENTIFIER_GROUP) |
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|
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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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|
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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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|
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static u32 |
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deny_mask_from_posix(unsigned short perm, u32 flags) |
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{ |
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u32 mask = 0; |
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|
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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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|
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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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|
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/* We only map from NFSv4 to POSIX ACLs when setting ACLs, when we err on the |
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* side of being more restrictive, so the mode bit mapping below is |
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* pessimistic. An optimistic version would be needed to handle DENY's, |
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* but we expect to coalesce all ALLOWs and DENYs before mapping to mode |
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* bits. */ |
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|
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static void |
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low_mode_from_nfs4(u32 perm, unsigned short *mode, unsigned int flags) |
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{ |
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u32 write_mode = NFS4_WRITE_MODE; |
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|
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if (flags & NFS4_ACL_DIR) |
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write_mode |= NFS4_ACE_DELETE_CHILD; |
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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 & write_mode) == 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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} |
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static short ace2type(struct nfs4_ace *); |
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static void _posix_to_nfsv4_one(struct posix_acl *, struct nfs4_acl *, |
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unsigned int); |
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int |
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nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, |
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struct nfs4_acl **acl) |
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{ |
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struct inode *inode = d_inode(dentry); |
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int error = 0; |
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struct posix_acl *pacl = NULL, *dpacl = NULL; |
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unsigned int flags = 0; |
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int size = 0; |
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pacl = get_acl(inode, ACL_TYPE_ACCESS); |
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if (!pacl) |
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pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); |
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if (IS_ERR(pacl)) |
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return PTR_ERR(pacl); |
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|
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/* allocate for worst case: one (deny, allow) pair each: */ |
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size += 2 * pacl->a_count; |
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if (S_ISDIR(inode->i_mode)) { |
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flags = NFS4_ACL_DIR; |
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dpacl = get_acl(inode, ACL_TYPE_DEFAULT); |
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if (IS_ERR(dpacl)) { |
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error = PTR_ERR(dpacl); |
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goto rel_pacl; |
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} |
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if (dpacl) |
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size += 2 * dpacl->a_count; |
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} |
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*acl = kmalloc(nfs4_acl_bytes(size), GFP_KERNEL); |
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if (*acl == NULL) { |
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error = -ENOMEM; |
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goto out; |
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} |
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(*acl)->naces = 0; |
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_posix_to_nfsv4_one(pacl, *acl, flags & ~NFS4_ACL_TYPE_DEFAULT); |
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if (dpacl) |
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_posix_to_nfsv4_one(dpacl, *acl, flags | NFS4_ACL_TYPE_DEFAULT); |
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out: |
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posix_acl_release(dpacl); |
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rel_pacl: |
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posix_acl_release(pacl); |
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return error; |
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} |
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struct posix_acl_summary { |
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unsigned short owner; |
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unsigned short users; |
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unsigned short group; |
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unsigned short groups; |
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unsigned short other; |
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unsigned short mask; |
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}; |
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static void |
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summarize_posix_acl(struct posix_acl *acl, struct posix_acl_summary *pas) |
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{ |
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struct posix_acl_entry *pa, *pe; |
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|
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/* |
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* Only pas.users and pas.groups need initialization; previous |
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* posix_acl_valid() calls ensure that the other fields will be |
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* initialized in the following loop. But, just to placate gcc: |
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*/ |
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memset(pas, 0, sizeof(*pas)); |
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pas->mask = 07; |
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pe = acl->a_entries + acl->a_count; |
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FOREACH_ACL_ENTRY(pa, acl, pe) { |
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switch (pa->e_tag) { |
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case ACL_USER_OBJ: |
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pas->owner = pa->e_perm; |
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break; |
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case ACL_GROUP_OBJ: |
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pas->group = pa->e_perm; |
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break; |
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case ACL_USER: |
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pas->users |= pa->e_perm; |
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break; |
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case ACL_GROUP: |
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pas->groups |= pa->e_perm; |
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break; |
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case ACL_OTHER: |
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pas->other = pa->e_perm; |
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break; |
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case ACL_MASK: |
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pas->mask = pa->e_perm; |
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break; |
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} |
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} |
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/* We'll only care about effective permissions: */ |
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pas->users &= pas->mask; |
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pas->group &= pas->mask; |
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pas->groups &= pas->mask; |
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} |
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/* We assume the acl has been verified with posix_acl_valid. */ |
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static void |
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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, *group_owner_entry; |
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struct nfs4_ace *ace; |
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struct posix_acl_summary pas; |
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unsigned short deny; |
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int eflag = ((flags & NFS4_ACL_TYPE_DEFAULT) ? |
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NFS4_INHERITANCE_FLAGS | NFS4_ACE_INHERIT_ONLY_ACE : 0); |
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BUG_ON(pacl->a_count < 3); |
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summarize_posix_acl(pacl, &pas); |
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pa = pacl->a_entries; |
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ace = acl->aces + acl->naces; |
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/* We could deny everything not granted by the owner: */ |
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deny = ~pas.owner; |
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/* |
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* but it is equivalent (and simpler) to deny only what is not |
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* granted by later entries: |
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*/ |
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deny &= pas.users | pas.group | pas.groups | pas.other; |
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if (deny) { |
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ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE; |
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ace->flag = eflag; |
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ace->access_mask = deny_mask_from_posix(deny, flags); |
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ace->whotype = NFS4_ACL_WHO_OWNER; |
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ace++; |
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acl->naces++; |
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} |
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ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE; |
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ace->flag = eflag; |
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ace->access_mask = mask_from_posix(pa->e_perm, flags | NFS4_ACL_OWNER); |
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ace->whotype = NFS4_ACL_WHO_OWNER; |
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ace++; |
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acl->naces++; |
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pa++; |
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while (pa->e_tag == ACL_USER) { |
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deny = ~(pa->e_perm & pas.mask); |
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deny &= pas.groups | pas.group | pas.other; |
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if (deny) { |
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ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE; |
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ace->flag = eflag; |
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ace->access_mask = deny_mask_from_posix(deny, flags); |
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ace->whotype = NFS4_ACL_WHO_NAMED; |
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ace->who_uid = pa->e_uid; |
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ace++; |
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acl->naces++; |
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} |
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ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE; |
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ace->flag = eflag; |
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ace->access_mask = mask_from_posix(pa->e_perm & pas.mask, |
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flags); |
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ace->whotype = NFS4_ACL_WHO_NAMED; |
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ace->who_uid = pa->e_uid; |
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ace++; |
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acl->naces++; |
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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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group_owner_entry = pa; |
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ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE; |
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ace->flag = eflag; |
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ace->access_mask = mask_from_posix(pas.group, flags); |
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ace->whotype = NFS4_ACL_WHO_GROUP; |
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ace++; |
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acl->naces++; |
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pa++; |
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while (pa->e_tag == ACL_GROUP) { |
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ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE; |
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ace->flag = eflag | NFS4_ACE_IDENTIFIER_GROUP; |
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ace->access_mask = mask_from_posix(pa->e_perm & pas.mask, |
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flags); |
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ace->whotype = NFS4_ACL_WHO_NAMED; |
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ace->who_gid = pa->e_gid; |
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ace++; |
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acl->naces++; |
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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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|
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deny = ~pas.group & pas.other; |
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if (deny) { |
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ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE; |
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ace->flag = eflag; |
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ace->access_mask = deny_mask_from_posix(deny, flags); |
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ace->whotype = NFS4_ACL_WHO_GROUP; |
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ace++; |
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acl->naces++; |
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} |
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pa++; |
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|
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while (pa->e_tag == ACL_GROUP) { |
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deny = ~(pa->e_perm & pas.mask); |
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deny &= pas.other; |
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if (deny) { |
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ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE; |
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ace->flag = eflag | NFS4_ACE_IDENTIFIER_GROUP; |
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ace->access_mask = deny_mask_from_posix(deny, flags); |
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ace->whotype = NFS4_ACL_WHO_NAMED; |
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ace->who_gid = pa->e_gid; |
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ace++; |
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acl->naces++; |
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} |
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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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ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE; |
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ace->flag = eflag; |
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ace->access_mask = mask_from_posix(pa->e_perm, flags); |
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ace->whotype = NFS4_ACL_WHO_EVERYONE; |
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acl->naces++; |
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} |
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static bool |
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pace_gt(struct posix_acl_entry *pace1, struct posix_acl_entry *pace2) |
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{ |
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if (pace1->e_tag != pace2->e_tag) |
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return pace1->e_tag > pace2->e_tag; |
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if (pace1->e_tag == ACL_USER) |
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return uid_gt(pace1->e_uid, pace2->e_uid); |
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if (pace1->e_tag == ACL_GROUP) |
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return gid_gt(pace1->e_gid, pace2->e_gid); |
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return false; |
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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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|
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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 (pace_gt(&pacl->a_entries[i], |
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&pacl->a_entries[i+1])) { |
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sorted = 0; |
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swap(pacl->a_entries[i], |
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pacl->a_entries[i + 1]); |
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} |
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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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|
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/* no users or groups */ |
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if (!pacl || pacl->a_count <= 4) |
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return; |
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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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|
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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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|
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/* |
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* While processing the NFSv4 ACE, this maintains bitmasks representing |
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* which permission bits have been allowed and which denied to a given |
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* entity: */ |
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struct posix_ace_state { |
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u32 allow; |
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u32 deny; |
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}; |
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|
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struct posix_user_ace_state { |
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union { |
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kuid_t uid; |
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kgid_t gid; |
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}; |
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struct posix_ace_state perms; |
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}; |
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struct posix_ace_state_array { |
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int n; |
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struct posix_user_ace_state aces[]; |
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}; |
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|
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/* |
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* While processing the NFSv4 ACE, this maintains the partial permissions |
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* calculated so far: */ |
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|
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struct posix_acl_state { |
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int empty; |
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struct posix_ace_state owner; |
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struct posix_ace_state group; |
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struct posix_ace_state other; |
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struct posix_ace_state everyone; |
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struct posix_ace_state mask; /* Deny unused in this case */ |
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struct posix_ace_state_array *users; |
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struct posix_ace_state_array *groups; |
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}; |
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static int |
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init_state(struct posix_acl_state *state, int cnt) |
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{ |
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int alloc; |
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|
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memset(state, 0, sizeof(struct posix_acl_state)); |
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state->empty = 1; |
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/* |
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* In the worst case, each individual acl could be for a distinct |
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* named user or group, but we don't know which, so we allocate |
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* enough space for either: |
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*/ |
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alloc = sizeof(struct posix_ace_state_array) |
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+ cnt*sizeof(struct posix_user_ace_state); |
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state->users = kzalloc(alloc, GFP_KERNEL); |
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if (!state->users) |
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return -ENOMEM; |
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state->groups = kzalloc(alloc, GFP_KERNEL); |
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if (!state->groups) { |
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kfree(state->users); |
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return -ENOMEM; |
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} |
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return 0; |
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} |
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static void |
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free_state(struct posix_acl_state *state) { |
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kfree(state->users); |
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kfree(state->groups); |
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} |
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static inline void add_to_mask(struct posix_acl_state *state, struct posix_ace_state *astate) |
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{ |
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state->mask.allow |= astate->allow; |
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} |
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|
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static struct posix_acl * |
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posix_state_to_acl(struct posix_acl_state *state, unsigned int flags) |
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{ |
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struct posix_acl_entry *pace; |
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struct posix_acl *pacl; |
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int nace; |
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int i; |
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|
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/* |
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* ACLs with no ACEs are treated differently in the inheritable |
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* and effective cases: when there are no inheritable ACEs, |
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* calls ->set_acl with a NULL ACL structure. |
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*/ |
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if (state->empty && (flags & NFS4_ACL_TYPE_DEFAULT)) |
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return NULL; |
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|
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/* |
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* When there are no effective ACEs, the following will end |
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* up setting a 3-element effective posix ACL with all |
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* permissions zero. |
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*/ |
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if (!state->users->n && !state->groups->n) |
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nace = 3; |
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else /* Note we also include a MASK ACE in this case: */ |
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nace = 4 + state->users->n + state->groups->n; |
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pacl = posix_acl_alloc(nace, GFP_KERNEL); |
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if (!pacl) |
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return ERR_PTR(-ENOMEM); |
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|
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pace = pacl->a_entries; |
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pace->e_tag = ACL_USER_OBJ; |
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low_mode_from_nfs4(state->owner.allow, &pace->e_perm, flags); |
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|
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for (i=0; i < state->users->n; i++) { |
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pace++; |
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pace->e_tag = ACL_USER; |
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low_mode_from_nfs4(state->users->aces[i].perms.allow, |
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&pace->e_perm, flags); |
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pace->e_uid = state->users->aces[i].uid; |
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add_to_mask(state, &state->users->aces[i].perms); |
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} |
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pace++; |
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pace->e_tag = ACL_GROUP_OBJ; |
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low_mode_from_nfs4(state->group.allow, &pace->e_perm, flags); |
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add_to_mask(state, &state->group); |
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|
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for (i=0; i < state->groups->n; i++) { |
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pace++; |
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pace->e_tag = ACL_GROUP; |
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low_mode_from_nfs4(state->groups->aces[i].perms.allow, |
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&pace->e_perm, flags); |
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pace->e_gid = state->groups->aces[i].gid; |
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add_to_mask(state, &state->groups->aces[i].perms); |
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} |
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|
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if (state->users->n || state->groups->n) { |
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pace++; |
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pace->e_tag = ACL_MASK; |
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low_mode_from_nfs4(state->mask.allow, &pace->e_perm, flags); |
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} |
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|
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pace++; |
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pace->e_tag = ACL_OTHER; |
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low_mode_from_nfs4(state->other.allow, &pace->e_perm, flags); |
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|
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return pacl; |
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} |
|
|
|
static inline void allow_bits(struct posix_ace_state *astate, u32 mask) |
|
{ |
|
/* Allow all bits in the mask not already denied: */ |
|
astate->allow |= mask & ~astate->deny; |
|
} |
|
|
|
static inline void deny_bits(struct posix_ace_state *astate, u32 mask) |
|
{ |
|
/* Deny all bits in the mask not already allowed: */ |
|
astate->deny |= mask & ~astate->allow; |
|
} |
|
|
|
static int find_uid(struct posix_acl_state *state, kuid_t uid) |
|
{ |
|
struct posix_ace_state_array *a = state->users; |
|
int i; |
|
|
|
for (i = 0; i < a->n; i++) |
|
if (uid_eq(a->aces[i].uid, uid)) |
|
return i; |
|
/* Not found: */ |
|
a->n++; |
|
a->aces[i].uid = uid; |
|
a->aces[i].perms.allow = state->everyone.allow; |
|
a->aces[i].perms.deny = state->everyone.deny; |
|
|
|
return i; |
|
} |
|
|
|
static int find_gid(struct posix_acl_state *state, kgid_t gid) |
|
{ |
|
struct posix_ace_state_array *a = state->groups; |
|
int i; |
|
|
|
for (i = 0; i < a->n; i++) |
|
if (gid_eq(a->aces[i].gid, gid)) |
|
return i; |
|
/* Not found: */ |
|
a->n++; |
|
a->aces[i].gid = gid; |
|
a->aces[i].perms.allow = state->everyone.allow; |
|
a->aces[i].perms.deny = state->everyone.deny; |
|
|
|
return i; |
|
} |
|
|
|
static void deny_bits_array(struct posix_ace_state_array *a, u32 mask) |
|
{ |
|
int i; |
|
|
|
for (i=0; i < a->n; i++) |
|
deny_bits(&a->aces[i].perms, mask); |
|
} |
|
|
|
static void allow_bits_array(struct posix_ace_state_array *a, u32 mask) |
|
{ |
|
int i; |
|
|
|
for (i=0; i < a->n; i++) |
|
allow_bits(&a->aces[i].perms, mask); |
|
} |
|
|
|
static void process_one_v4_ace(struct posix_acl_state *state, |
|
struct nfs4_ace *ace) |
|
{ |
|
u32 mask = ace->access_mask; |
|
int i; |
|
|
|
state->empty = 0; |
|
|
|
switch (ace2type(ace)) { |
|
case ACL_USER_OBJ: |
|
if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) { |
|
allow_bits(&state->owner, mask); |
|
} else { |
|
deny_bits(&state->owner, mask); |
|
} |
|
break; |
|
case ACL_USER: |
|
i = find_uid(state, ace->who_uid); |
|
if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) { |
|
allow_bits(&state->users->aces[i].perms, mask); |
|
} else { |
|
deny_bits(&state->users->aces[i].perms, mask); |
|
mask = state->users->aces[i].perms.deny; |
|
deny_bits(&state->owner, mask); |
|
} |
|
break; |
|
case ACL_GROUP_OBJ: |
|
if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) { |
|
allow_bits(&state->group, mask); |
|
} else { |
|
deny_bits(&state->group, mask); |
|
mask = state->group.deny; |
|
deny_bits(&state->owner, mask); |
|
deny_bits(&state->everyone, mask); |
|
deny_bits_array(state->users, mask); |
|
deny_bits_array(state->groups, mask); |
|
} |
|
break; |
|
case ACL_GROUP: |
|
i = find_gid(state, ace->who_gid); |
|
if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) { |
|
allow_bits(&state->groups->aces[i].perms, mask); |
|
} else { |
|
deny_bits(&state->groups->aces[i].perms, mask); |
|
mask = state->groups->aces[i].perms.deny; |
|
deny_bits(&state->owner, mask); |
|
deny_bits(&state->group, mask); |
|
deny_bits(&state->everyone, mask); |
|
deny_bits_array(state->users, mask); |
|
deny_bits_array(state->groups, mask); |
|
} |
|
break; |
|
case ACL_OTHER: |
|
if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) { |
|
allow_bits(&state->owner, mask); |
|
allow_bits(&state->group, mask); |
|
allow_bits(&state->other, mask); |
|
allow_bits(&state->everyone, mask); |
|
allow_bits_array(state->users, mask); |
|
allow_bits_array(state->groups, mask); |
|
} else { |
|
deny_bits(&state->owner, mask); |
|
deny_bits(&state->group, mask); |
|
deny_bits(&state->other, mask); |
|
deny_bits(&state->everyone, mask); |
|
deny_bits_array(state->users, mask); |
|
deny_bits_array(state->groups, mask); |
|
} |
|
} |
|
} |
|
|
|
static int nfs4_acl_nfsv4_to_posix(struct nfs4_acl *acl, |
|
struct posix_acl **pacl, struct posix_acl **dpacl, |
|
unsigned int flags) |
|
{ |
|
struct posix_acl_state effective_acl_state, default_acl_state; |
|
struct nfs4_ace *ace; |
|
int ret; |
|
|
|
ret = init_state(&effective_acl_state, acl->naces); |
|
if (ret) |
|
return ret; |
|
ret = init_state(&default_acl_state, acl->naces); |
|
if (ret) |
|
goto out_estate; |
|
ret = -EINVAL; |
|
for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) { |
|
if (ace->type != NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE && |
|
ace->type != NFS4_ACE_ACCESS_DENIED_ACE_TYPE) |
|
goto out_dstate; |
|
if (ace->flag & ~NFS4_SUPPORTED_FLAGS) |
|
goto out_dstate; |
|
if ((ace->flag & NFS4_INHERITANCE_FLAGS) == 0) { |
|
process_one_v4_ace(&effective_acl_state, ace); |
|
continue; |
|
} |
|
if (!(flags & NFS4_ACL_DIR)) |
|
goto out_dstate; |
|
/* |
|
* Note that when only one of FILE_INHERIT or DIRECTORY_INHERIT |
|
* is set, we're effectively turning on the other. That's OK, |
|
* according to rfc 3530. |
|
*/ |
|
process_one_v4_ace(&default_acl_state, ace); |
|
|
|
if (!(ace->flag & NFS4_ACE_INHERIT_ONLY_ACE)) |
|
process_one_v4_ace(&effective_acl_state, ace); |
|
} |
|
*pacl = posix_state_to_acl(&effective_acl_state, flags); |
|
if (IS_ERR(*pacl)) { |
|
ret = PTR_ERR(*pacl); |
|
*pacl = NULL; |
|
goto out_dstate; |
|
} |
|
*dpacl = posix_state_to_acl(&default_acl_state, |
|
flags | NFS4_ACL_TYPE_DEFAULT); |
|
if (IS_ERR(*dpacl)) { |
|
ret = PTR_ERR(*dpacl); |
|
*dpacl = NULL; |
|
posix_acl_release(*pacl); |
|
*pacl = NULL; |
|
goto out_dstate; |
|
} |
|
sort_pacl(*pacl); |
|
sort_pacl(*dpacl); |
|
ret = 0; |
|
out_dstate: |
|
free_state(&default_acl_state); |
|
out_estate: |
|
free_state(&effective_acl_state); |
|
return ret; |
|
} |
|
|
|
__be32 |
|
nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, |
|
struct nfs4_acl *acl) |
|
{ |
|
__be32 error; |
|
int host_error; |
|
struct dentry *dentry; |
|
struct inode *inode; |
|
struct posix_acl *pacl = NULL, *dpacl = NULL; |
|
unsigned int flags = 0; |
|
|
|
/* Get inode */ |
|
error = fh_verify(rqstp, fhp, 0, NFSD_MAY_SATTR); |
|
if (error) |
|
return error; |
|
|
|
dentry = fhp->fh_dentry; |
|
inode = d_inode(dentry); |
|
|
|
if (S_ISDIR(inode->i_mode)) |
|
flags = NFS4_ACL_DIR; |
|
|
|
host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); |
|
if (host_error == -EINVAL) |
|
return nfserr_attrnotsupp; |
|
if (host_error < 0) |
|
goto out_nfserr; |
|
|
|
fh_lock(fhp); |
|
|
|
host_error = set_posix_acl(&init_user_ns, inode, ACL_TYPE_ACCESS, pacl); |
|
if (host_error < 0) |
|
goto out_drop_lock; |
|
|
|
if (S_ISDIR(inode->i_mode)) { |
|
host_error = set_posix_acl(&init_user_ns, inode, |
|
ACL_TYPE_DEFAULT, dpacl); |
|
} |
|
|
|
out_drop_lock: |
|
fh_unlock(fhp); |
|
|
|
posix_acl_release(pacl); |
|
posix_acl_release(dpacl); |
|
out_nfserr: |
|
if (host_error == -EOPNOTSUPP) |
|
return nfserr_attrnotsupp; |
|
else |
|
return nfserrno(host_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; |
|
} |
|
|
|
/* |
|
* return the size of the struct nfs4_acl required to represent an acl |
|
* with @entries entries. |
|
*/ |
|
int nfs4_acl_bytes(int entries) |
|
{ |
|
return sizeof(struct nfs4_acl) + entries * sizeof(struct nfs4_ace); |
|
} |
|
|
|
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; |
|
} |
|
|
|
__be32 nfs4_acl_write_who(struct xdr_stream *xdr, int who) |
|
{ |
|
__be32 *p; |
|
int i; |
|
|
|
for (i = 0; i < ARRAY_SIZE(s2t_map); i++) { |
|
if (s2t_map[i].type != who) |
|
continue; |
|
p = xdr_reserve_space(xdr, s2t_map[i].stringlen + 4); |
|
if (!p) |
|
return nfserr_resource; |
|
p = xdr_encode_opaque(p, s2t_map[i].string, |
|
s2t_map[i].stringlen); |
|
return 0; |
|
} |
|
WARN_ON_ONCE(1); |
|
return nfserr_serverfault; |
|
}
|
|
|