nss/tst-reload2.c

   1 /* Test that reloading is disabled after a chroot.
   2    Copyright (C) 2020-2021 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <nss.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <limits.h>
  24 #include <sys/types.h>
  25 #include <errno.h>
  26 #include <pwd.h>
  27 #include <grp.h>
  28 #include <unistd.h>
  29
  30 #include <support/support.h>
  31 #include <support/check.h>
  32 #include <support/xunistd.h>
  33
  34 #include "nss_test.h"
  35
  36 #ifndef PATH_MAX
  37 # define PATH_MAX 1024
  38 #endif
  39
  40 static struct passwd pwd_table1[] =
  41   {
  42    PWD_N (1234, "test1"),
  43    PWD_N (4321, "test2"),
  44    PWD_LAST ()
  45   };
  46
  47 static const char *group_4[] = {
  48   "alpha", "beta", "gamma", "fred", NULL
  49 };
  50
  51 static struct group group_table_data[] =
  52   {
  53    GRP (4),
  54    GRP_LAST ()
  55   };
  56
  57 void
  58 _nss_test1_init_hook (test_tables *t)
  59 {
  60   t->pwd_table = pwd_table1;
  61   t->grp_table = group_table_data;
  62 }
  63
  64 static struct passwd pwd_table2[] =
  65   {
  66    PWD_N (5, "test1"),
  67    PWD_N (2468, "test2"),
  68    PWD_LAST ()
  69   };
  70
  71 void
  72 _nss_test2_init_hook (test_tables *t)
  73 {
  74   t->pwd_table = pwd_table2;
  75 }
  76
  77 static int
  78 do_test (void)
  79 {
  80   struct passwd *pw;
  81   struct group *gr;
  82   char buf1[PATH_MAX];
  83   char buf2[PATH_MAX];
  84
  85   sprintf (buf1, "/subdir%s", support_slibdir_prefix);
  86   xmkdirp (buf1, 0777);
  87
  88   /* Copy this DSO into the chroot so it *could* be loaded.  */
  89   sprintf (buf1, "%s/libnss_files.so.2", support_slibdir_prefix);
  90   sprintf (buf2, "/subdir%s/libnss_files.so.2", support_slibdir_prefix);
  91   support_copy_file (buf1, buf2);
  92
  93   /* Check we're using the "outer" nsswitch.conf.  */
  94
  95   /* This uses the test1 DSO.  */
  96   pw = getpwnam ("test1");
  97   TEST_VERIFY (pw != NULL);
  98   if (pw)
  99     TEST_COMPARE (pw->pw_uid, 1234);
 100
 101   /* This just loads the test2 DSO.  */
 102   gr = getgrnam ("name4");
 103
 104   /* Change the root dir.  */
 105
 106   TEST_VERIFY (chroot ("/subdir") == 0);
 107   chdir ("/");
 108
 109   /* Check we're NOT using the "inner" nsswitch.conf.  */
 110
 111   /* Both DSOs are loaded, which is used?  */
 112   pw = getpwnam ("test2");
 113   TEST_VERIFY (pw != NULL);
 114   if (pw)
 115     TEST_VERIFY (pw->pw_uid != 2468);
 116
 117   /* The "files" DSO should not be loaded.  */
 118   gr = getgrnam ("test3");
 119   TEST_VERIFY (gr == NULL);
 120
 121   /* We should still be using the old configuration.  */
 122   pw = getpwnam ("test1");
 123   TEST_VERIFY (pw != NULL);
 124   if (pw)
 125     TEST_COMPARE (pw->pw_uid, 1234);
 126
 127   return 0;
 128 }
 129
 130 #include <support/test-driver.c>