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FreeBSD/Linux Kernel Cross Reference
sys/posix1e/acl_perm.c

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    1 /*
    2  * Copyright (c) 2001-2002 Chris D. Faulhaber
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: stable/8/lib/libc/posix1e/acl_perm.c 208756 2010-06-02 20:35:56Z trasz $");
   29 
   30 #include <sys/types.h>
   31 #include "namespace.h"
   32 #include <sys/acl.h>
   33 #include "un-namespace.h"
   34 
   35 #include <errno.h>
   36 #include <string.h>
   37 
   38 static int
   39 _perm_is_invalid(acl_perm_t perm)
   40 {
   41 
   42         /* Check if more than a single bit is set. */
   43         if ((perm & -perm) == perm &&
   44             (perm & (ACL_POSIX1E_BITS | ACL_NFS4_PERM_BITS)) == perm)
   45                 return (0);
   46 
   47         errno = EINVAL;
   48 
   49         return (1);
   50 }
   51 
   52 /*
   53  * acl_add_perm() (23.4.1): add the permission contained in perm to the
   54  * permission set permset_d
   55  */
   56 int
   57 acl_add_perm(acl_permset_t permset_d, acl_perm_t perm)
   58 {
   59 
   60         if (permset_d == NULL) {
   61                 errno = EINVAL;
   62                 return (-1);
   63         }
   64 
   65         if (_perm_is_invalid(perm))
   66                 return (-1);
   67 
   68         *permset_d |= perm;
   69 
   70         return (0);
   71 }
   72 
   73 /*
   74  * acl_clear_perms() (23.4.3): clear all permisions from the permission
   75  * set permset_d
   76  */
   77 int
   78 acl_clear_perms(acl_permset_t permset_d)
   79 {
   80 
   81         if (permset_d == NULL) {
   82                 errno = EINVAL;
   83                 return (-1);
   84         }
   85 
   86         *permset_d = ACL_PERM_NONE;
   87 
   88         return (0);
   89 }
   90 
   91 /*
   92  * acl_delete_perm() (23.4.10): remove the permission in perm from the
   93  * permission set permset_d
   94  */
   95 int
   96 acl_delete_perm(acl_permset_t permset_d, acl_perm_t perm)
   97 {
   98 
   99         if (permset_d == NULL) {
  100                 errno = EINVAL;
  101                 return (-1);
  102         }
  103 
  104         if (_perm_is_invalid(perm))
  105                 return (-1);
  106 
  107         *permset_d &= ~perm;
  108 
  109         return (0);
  110 }
  111 
  112 int
  113 acl_get_perm_np(acl_permset_t permset_d, acl_perm_t perm)
  114 {
  115 
  116         if (permset_d == NULL) {
  117                 errno = EINVAL;
  118                 return (-1);
  119         }
  120 
  121         if (_perm_is_invalid(perm))
  122                 return (-1);
  123 
  124         if (*permset_d & perm)
  125                 return (1);
  126 
  127         return (0);
  128 }

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