nis/nis_ismember.c

   1 /* Copyright (c) 1997, 1998, 1999 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@suse.de>, 1997.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA. */
  19
  20 #include <string.h>
  21 #include <rpcsvc/nis.h>
  22
  23 /* internal_nis_ismember ()
  24    return codes: -1 principal is in -group
  25                   0 principal isn't in any group
  26                   1 pirncipal is in group */
  27 static int
  28 internal_ismember (const_nis_name principal, const_nis_name group)
  29 {
  30   size_t grouplen = strlen (group);
  31   char buf[grouplen + 50];
  32   char leafbuf[grouplen + 2];
  33   char domainbuf[grouplen + 2];
  34   nis_result *res;
  35   char *cp, *cp2;
  36   u_int i;
  37
  38   cp = stpcpy (buf, nis_leaf_of_r (group, leafbuf, sizeof (leafbuf) - 1));
  39   cp = stpcpy (cp, ".groups_dir");
  40   cp2 = nis_domain_of_r (group, domainbuf, sizeof (domainbuf) - 1);
  41   if (cp2 != NULL && cp2[0] != '\0')
  42     {
  43       *cp++ = '.';
  44       strcpy (cp, cp2);
  45     }
  46
  47   res = nis_lookup (buf, EXPAND_NAME|FOLLOW_LINKS);
  48   if (res == NULL || NIS_RES_STATUS (res) != NIS_SUCCESS)
  49     {
  50       if (res)
  51         nis_freeresult (res);
  52       return 0;
  53     }
  54
  55   if ((NIS_RES_NUMOBJ (res) != 1) ||
  56       (__type_of (NIS_RES_OBJECT (res)) != NIS_GROUP_OBJ))
  57     {
  58       nis_freeresult (res);
  59       return 0;
  60     }
  61
  62   /* We search twice in the list, at first, if we have the name
  63      with a "-", then if without. "-member" has priority */
  64   for (i = 0; i < NIS_RES_OBJECT(res)->GR_data.gr_members.gr_members_len; ++i)
  65     {
  66       cp = NIS_RES_OBJECT (res)->GR_data.gr_members.gr_members_val[i];
  67       if (cp[0] == '-')
  68         {
  69           if (strcmp (&cp[1], principal) == 0)
  70             {
  71               nis_freeresult (res);
  72               return -1;
  73             }
  74           if (cp[1] == '@')
  75             switch (internal_ismember (principal, &cp[2]))
  76               {
  77               case -1:
  78                 nis_freeresult (res);
  79                 return -1;
  80               case 1:
  81                 nis_freeresult (res);
  82                 return 1;
  83               default:
  84                 break;
  85               }
  86           else
  87             if (cp[1] == '*')
  88               {
  89                 char buf1[strlen (principal) + 2];
  90                 char buf2[strlen (cp) + 2];
  91
  92                 if (strcmp (nis_domain_of_r (principal, buf1, sizeof buf1),
  93                             nis_domain_of_r (cp, buf2, sizeof buf2)) == 0)
  94                   {
  95                     nis_freeresult (res);
  96                     return -1;
  97                   }
  98               }
  99         }
 100     }
 101
 102   for (i = 0; i < NIS_RES_OBJECT (res)->GR_data.gr_members.gr_members_len; ++i)
 103     {
 104       cp = NIS_RES_OBJECT (res)->GR_data.gr_members.gr_members_val[i];
 105       if (cp[0] != '-')
 106         {
 107           if (strcmp (cp, principal) == 0)
 108             {
 109               nis_freeresult (res);
 110               return 1;
 111             }
 112           if (cp[0] == '@')
 113             switch (internal_ismember (principal, &cp[1]))
 114               {
 115               case -1:
 116                 nis_freeresult (res);
 117                 return -1;
 118               case 1:
 119                 nis_freeresult (res);
 120                 return 1;
 121               default:
 122                 break;
 123               }
 124           else
 125             if (cp[0] == '*')
 126               {
 127                 char buf1[strlen (principal) + 2];
 128                 char buf2[strlen (cp) + 2];
 129
 130                 if (strcmp (nis_domain_of_r (principal, buf1, sizeof buf1),
 131                             nis_domain_of_r (cp, buf2, sizeof buf2)) == 0)
 132                   {
 133                     nis_freeresult (res);
 134                     return 1;
 135                   }
 136               }
 137         }
 138     }
 139   nis_freeresult (res);
 140   return 0;
 141 }
 142
 143 bool_t
 144 nis_ismember (const_nis_name principal, const_nis_name group)
 145 {
 146   if (group != NULL && group[0] != '\0' && principal != NULL)
 147     return internal_ismember (principal, group) == 1 ? TRUE : FALSE;
 148   else
 149     return FALSE;
 150 }