nis/nis_ismember.c

   1 /* Copyright (c) 1997, 1998 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   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   res = nis_lookup (buf, EXPAND_NAME|FOLLOW_LINKS);
  47   if (NIS_RES_STATUS (res) != NIS_SUCCESS)
  48     return 0;
  49
  50   if ((NIS_RES_NUMOBJ (res) != 1) ||
  51       (__type_of (NIS_RES_OBJECT (res)) != NIS_GROUP_OBJ))
  52     return 0;
  53
  54   /* We search twice in the list, at first, if we have the name
  55      with a "-", then if without. "-member" has priority */
  56   for (i = 0; i < NIS_RES_OBJECT(res)->GR_data.gr_members.gr_members_len; ++i)
  57     {
  58       cp = NIS_RES_OBJECT (res)->GR_data.gr_members.gr_members_val[i];
  59       if (cp[0] == '-')
  60         {
  61           if (strcmp (&cp[1], principal) == 0)
  62             return -1;
  63           if (cp[1] == '@')
  64             switch (internal_ismember (principal, &cp[2]))
  65               {
  66               case -1:
  67                 return -1;
  68               case 1:
  69                 return -1;
  70               default:
  71                 break;
  72               }
  73           else
  74             if (cp[1] == '*')
  75               {
  76                 char buf1[strlen (principal) + 2];
  77                 char buf2[strlen (cp) + 2];
  78
  79                 strcpy (buf1, nis_domain_of (principal));
  80                 strcpy (buf2, nis_domain_of (cp));
  81                 if (strcmp (buf1, buf2) == 0)
  82                   return -1;
  83               }
  84         }
  85     }
  86   for (i = 0; i < NIS_RES_OBJECT (res)->GR_data.gr_members.gr_members_len; ++i)
  87     {
  88       cp = NIS_RES_OBJECT (res)->GR_data.gr_members.gr_members_val[i];
  89       if (cp[0] != '-')
  90         {
  91           if (strcmp (cp, principal) == 0)
  92             return 1;
  93           if (cp[0] == '@')
  94             switch (internal_ismember (principal, &cp[1]))
  95               {
  96               case -1:
  97                 return -1;
  98               case 1:
  99                 return 1;
 100               default:
 101                 break;
 102               }
 103           else
 104             if (cp[0] == '*')
 105               {
 106                 char buf1[strlen (principal) + 2];
 107                 char buf2[strlen (cp) + 2];
 108
 109                 if (strcmp (nis_domain_of_r (principal, buf1, sizeof buf1),
 110                             nis_domain_of_r (cp, buf2, sizeof buf2)) == 0)
 111                   return 1;
 112               }
 113         }
 114     }
 115   return 0;
 116 }
 117
 118 bool_t
 119 nis_ismember (const_nis_name principal, const_nis_name group)
 120 {
 121   if (group != NULL && group[0] != '\0' && principal != NULL)
 122     return internal_ismember (principal, group) == 1 ? TRUE : FALSE;
 123   else
 124     return FALSE;
 125 }