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/* Copyright (c) 1997-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@suse.de>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <string.h>
#include <rpcsvc/nis.h>
#include <shlib-compat.h>
/* internal_nis_ismember ()
return codes: -1 principal is in -group
0 principal isn't in any group
1 pirncipal is in group */
static int
internal_ismember (const_nis_name principal, const_nis_name group)
{
size_t grouplen = strlen (group);
char buf[grouplen + 50];
char leafbuf[grouplen + 2];
char domainbuf[grouplen + 2];
nis_result *res;
char *cp, *cp2;
u_int i;
cp = stpcpy (buf, nis_leaf_of_r (group, leafbuf, sizeof (leafbuf) - 1));
cp = stpcpy (cp, ".groups_dir");
cp2 = nis_domain_of_r (group, domainbuf, sizeof (domainbuf) - 1);
if (cp2 != NULL && cp2[0] != '\0')
{
*cp++ = '.';
strcpy (cp, cp2);
}
res = nis_lookup (buf, EXPAND_NAME|FOLLOW_LINKS);
if (res == NULL || NIS_RES_STATUS (res) != NIS_SUCCESS)
{
nis_freeresult (res);
return 0;
}
if ((NIS_RES_NUMOBJ (res) != 1)
|| (__type_of (NIS_RES_OBJECT (res)) != NIS_GROUP_OBJ))
{
nis_freeresult (res);
return 0;
}
/* We search twice in the list, at first, if we have the name
with a "-", then if without. "-member" has priority */
for (i = 0; i < NIS_RES_OBJECT(res)->GR_data.gr_members.gr_members_len; ++i)
{
cp = NIS_RES_OBJECT (res)->GR_data.gr_members.gr_members_val[i];
if (cp[0] == '-')
{
if (strcmp (&cp[1], principal) == 0)
{
nis_freeresult (res);
return -1;
}
if (cp[1] == '@')
switch (internal_ismember (principal, &cp[2]))
{
case -1:
nis_freeresult (res);
return -1;
case 1:
nis_freeresult (res);
return 1;
default:
break;
}
else
if (cp[1] == '*')
{
char buf1[strlen (principal) + 2];
char buf2[strlen (cp) + 2];
if (strcmp (nis_domain_of_r (principal, buf1, sizeof buf1),
nis_domain_of_r (cp, buf2, sizeof buf2)) == 0)
{
nis_freeresult (res);
return -1;
}
}
}
}
for (i = 0; i < NIS_RES_OBJECT (res)->GR_data.gr_members.gr_members_len; ++i)
{
cp = NIS_RES_OBJECT (res)->GR_data.gr_members.gr_members_val[i];
if (cp[0] != '-')
{
if (strcmp (cp, principal) == 0)
{
nis_freeresult (res);
return 1;
}
if (cp[0] == '@')
switch (internal_ismember (principal, &cp[1]))
{
case -1:
nis_freeresult (res);
return -1;
case 1:
nis_freeresult (res);
return 1;
default:
break;
}
else
if (cp[0] == '*')
{
char buf1[strlen (principal) + 2];
char buf2[strlen (cp) + 2];
if (strcmp (nis_domain_of_r (principal, buf1, sizeof buf1),
nis_domain_of_r (cp, buf2, sizeof buf2)) == 0)
{
nis_freeresult (res);
return 1;
}
}
}
}
nis_freeresult (res);
return 0;
}
bool_t
nis_ismember (const_nis_name principal, const_nis_name group)
{
if (group != NULL && group[0] != '\0' && principal != NULL)
return internal_ismember (principal, group) == 1 ? TRUE : FALSE;
else
return FALSE;
}
libnsl_hidden_nolink_def (nis_ismember, GLIBC_2_1)
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