nis/nis_ismember.c

   1 /* Copyright (c) 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.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 #include <rpcsvc/nislib.h>
  23
  24 /* internal_nis_ismember ()
  25    return codes: -1 principal is in -group
  26                   0 principal isn't in any group
  27                   1 pirncipal is in group */
  28 static int
  29 internal_ismember (const_nis_name principal, const_nis_name group)
  30 {
  31   if (group != NULL && strlen (group) > 0)
  32     {
  33       char buf[strlen (group) + 50];
  34       char leafbuf[strlen (group) + 2];
  35       char domainbuf[strlen (group) + 2];
  36       nis_result *res;
  37       char *cp, *cp2;
  38       u_int i;
  39
  40       cp = stpcpy (buf, nis_leaf_of_r (group, leafbuf, sizeof (leafbuf) - 1));
  41       cp = stpcpy (cp, ".groups_dir");
  42       cp2 = nis_domain_of_r (group, domainbuf, sizeof (domainbuf) - 1);
  43       if (cp2 != NULL && strlen (cp2) > 0)
  44         {
  45           cp = stpcpy (cp, ".");
  46           strcpy (cp, cp2);
  47         }
  48       res = nis_lookup (buf, EXPAND_NAME|FOLLOW_LINKS);
  49       if (res->status != NIS_SUCCESS && res->status != NIS_S_SUCCESS)
  50         return 0;
  51
  52       if ((res->objects.objects_len != 1) ||
  53           (res->objects.objects_val[0].zo_data.zo_type != GROUP_OBJ))
  54         return 0;
  55
  56       /* We search twice in the list, at first, if we have the name
  57          with a "-", then if without. "-member" has priority */
  58       for (i = 0;
  59            i < res->objects.objects_val[0].GR_data.gr_members.gr_members_len;
  60            ++i)
  61         {
  62           cp =res->objects.objects_val[0].GR_data.gr_members.gr_members_val[i];
  63           if (cp[0] == '-')
  64             {
  65               if (strcmp (&cp[1], principal) == 0)
  66                 return -1;
  67               if (cp[1] == '@')
  68                 switch (internal_ismember (principal, &cp[2]))
  69                   {
  70                   case -1:
  71                     return -1;
  72                   case 1:
  73                     return -1;
  74                   default:
  75                     break;
  76                   }
  77               else
  78                 if (cp[1] == '*')
  79                   {
  80                     char buf1[strlen (principal) + 2];
  81                     char buf2[strlen (cp) + 2];
  82
  83                     strcpy (buf1, nis_domain_of (principal));
  84                     strcpy (buf2, nis_domain_of (cp));
  85                     if (strcmp (buf1, buf2) == 0)
  86                       return -1;
  87                   }
  88             }
  89         }
  90       for (i = 0;
  91            i < res->objects.objects_val[0].GR_data.gr_members.gr_members_len;
  92            ++i)
  93         {
  94           cp =res->objects.objects_val[0].GR_data.gr_members.gr_members_val[i];
  95           if (cp[0] != '-')
  96             {
  97               if (strcmp (cp, principal) == 0)
  98                 return 1;
  99               if (cp[0] == '@')
 100                 switch (internal_ismember (principal, &cp[1]))
 101                   {
 102                   case -1:
 103                     return -1;
 104                   case 1:
 105                     return 1;
 106                   default:
 107                     break;
 108                   }
 109               else
 110                 if (cp[0] == '*')
 111                   {
 112                     char buf1[strlen (principal) + 2];
 113                     char buf2[strlen (cp) + 2];
 114
 115                     strcpy (buf1, nis_domain_of (principal));
 116                     strcpy (buf2, nis_domain_of (cp));
 117                     if (strcmp (buf1, buf2) == 0)
 118                       return 1;
 119                   }
 120             }
 121         }
 122     }
 123
 124   return 0;
 125 }
 126
 127 bool_t
 128 nis_ismember (const_nis_name principal, const_nis_name group)
 129 {
 130   if (group != NULL && strlen (group) > 0)
 131     {
 132       int status;
 133
 134       status = internal_ismember (principal, group);
 135       if (status == 1)
 136         return TRUE;
 137       else
 138         return FALSE;
 139     }
 140   else
 141     return FALSE;
 142 }