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
  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   char buf[strlen (group) + 50];
  31   char leafbuf[strlen (group) + 2];
  32   char domainbuf[strlen (group) + 2];
  33   nis_result *res;
  34   char *cp, *cp2;
  35   u_int i;
  36
  37   cp = stpcpy (buf, nis_leaf_of_r (group, leafbuf, sizeof (leafbuf) - 1));
  38   cp = stpcpy (cp, ".groups_dir");
  39   cp2 = nis_domain_of_r (group, domainbuf, sizeof (domainbuf) - 1);
  40   if (cp2 != NULL && strlen (cp2) > 0)
  41     {
  42       *cp++ = '.';
  43       strcpy (cp, cp2);
  44     }
  45   res = nis_lookup (buf, EXPAND_NAME|FOLLOW_LINKS);
  46   if (NIS_RES_STATUS (res) != NIS_SUCCESS)
  47     return 0;
  48
  49   if ((NIS_RES_NUMOBJ (res) != 1) ||
  50       (__type_of (NIS_RES_OBJECT (res)) != NIS_GROUP_OBJ))
  51     return 0;
  52
  53   /* We search twice in the list, at first, if we have the name
  54      with a "-", then if without. "-member" has priority */
  55   for (i = 0; i < NIS_RES_OBJECT(res)->GR_data.gr_members.gr_members_len; ++i)
  56     {
  57       cp = NIS_RES_OBJECT (res)->GR_data.gr_members.gr_members_val[i];
  58       if (cp[0] == '-')
  59         {
  60           if (strcmp (&cp[1], principal) == 0)
  61             return -1;
  62           if (cp[1] == '@')
  63             switch (internal_ismember (principal, &cp[2]))
  64               {
  65               case -1:
  66                 return -1;
  67               case 1:
  68                 return -1;
  69               default:
  70                 break;
  71               }
  72           else
  73             if (cp[1] == '*')
  74               {
  75                 char buf1[strlen (principal) + 2];
  76                 char buf2[strlen (cp) + 2];
  77
  78                 strcpy (buf1, nis_domain_of (principal));
  79                 strcpy (buf2, nis_domain_of (cp));
  80                 if (strcmp (buf1, buf2) == 0)
  81                   return -1;
  82               }
  83         }
  84     }
  85   for (i = 0; i < NIS_RES_OBJECT (res)->GR_data.gr_members.gr_members_len; ++i)
  86     {
  87       cp = NIS_RES_OBJECT (res)->GR_data.gr_members.gr_members_val[i];
  88       if (cp[0] != '-')
  89         {
  90           if (strcmp (cp, principal) == 0)
  91             return 1;
  92           if (cp[0] == '@')
  93             switch (internal_ismember (principal, &cp[1]))
  94               {
  95               case -1:
  96                 return -1;
  97               case 1:
  98                 return 1;
  99               default:
 100                 break;
 101               }
 102           else
 103             if (cp[0] == '*')
 104               {
 105                 char buf1[strlen (principal) + 2];
 106                 char buf2[strlen (cp) + 2];
 107
 108                 if (strcmp (nis_domain_of_r (principal, buf1, sizeof buf1),
 109                             nis_domain_of_r (cp, buf2, sizeof buf2)) == 0)
 110                   return 1;
 111               }
 112         }
 113     }
 114   return 0;
 115 }
 116
 117 bool_t
 118 nis_ismember (const_nis_name principal, const_nis_name group)
 119 {
 120   if (group != NULL && strlen (group) > 0 && principal != NULL)
 121     return internal_ismember (principal, group) == 1 ? TRUE : FALSE;
 122   else
 123     return FALSE;
 124 }