nss/tst-reload2.c

   1 /* Test that reloading is disabled after a chroot.
   2    Copyright (C) 2020-2022 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 #include <netdb.h>
  30
  31 #include <support/support.h>
  32 #include <support/check.h>
  33 #include <support/xunistd.h>
  34
  35 #include "nss_test.h"
  36
  37 #ifndef PATH_MAX
  38 # define PATH_MAX 1024
  39 #endif
  40
  41 static struct passwd pwd_table1[] =
  42   {
  43    PWD_N (1234, "test1"),
  44    PWD_N (4321, "test2"),
  45    PWD_LAST ()
  46   };
  47
  48 static const char *group_4[] = {
  49   "alpha", "beta", "gamma", "fred", NULL
  50 };
  51
  52 static struct group group_table_data1[] =
  53   {
  54    GRP (4),
  55    GRP_LAST ()
  56   };
  57
  58 void
  59 _nss_test1_init_hook (test_tables *t)
  60 {
  61   t->pwd_table = pwd_table1;
  62   t->grp_table = group_table_data1;
  63 }
  64
  65 static struct passwd pwd_table2[] =
  66   {
  67    PWD_N (5, "test1"),
  68    PWD_N (2468, "test2"),
  69    PWD_LAST ()
  70   };
  71
  72 static const char *group_5[] = {
  73   "fred", NULL
  74 };
  75
  76 static struct group group_table_data2[] =
  77   {
  78    GRP (5),
  79    GRP_LAST ()
  80   };
  81
  82 void
  83 _nss_test2_init_hook (test_tables *t)
  84 {
  85   t->pwd_table = pwd_table2;
  86   t->grp_table = group_table_data2;
  87 }
  88
  89 static int
  90 do_test (void)
  91 {
  92   struct passwd *pw;
  93   struct group *gr;
  94   struct hostent *he;
  95   char buf1[PATH_MAX];
  96   char buf2[PATH_MAX];
  97
  98   support_need_proc ("Our xmkdirp fails if we can't map our uid, which requires /proc.");
  99
 100   sprintf (buf1, "/subdir%s", support_slibdir_prefix);
 101   xmkdirp (buf1, 0777);
 102
 103   /* Copy this DSO into the chroot so it *could* be loaded.  */
 104   sprintf (buf1, "%s/libnss_files.so.2", support_slibdir_prefix);
 105   sprintf (buf2, "/subdir%s/libnss_files.so.2", support_slibdir_prefix);
 106   support_copy_file (buf1, buf2);
 107
 108   /* Check we're using the "outer" nsswitch.conf.  */
 109
 110   /* This uses the test1 DSO.  */
 111   pw = getpwnam ("test1");
 112   TEST_VERIFY (pw != NULL);
 113   if (pw)
 114     TEST_COMPARE (pw->pw_uid, 1234);
 115
 116   /* This just loads the test2 DSO.  */
 117   gr = getgrgid (5);
 118   TEST_VERIFY (gr != NULL);
 119
 120
 121   /* Change the root dir.  */
 122
 123   TEST_VERIFY (chroot ("/subdir") == 0);
 124   chdir ("/");
 125
 126   /* Check we're NOT using the "inner" nsswitch.conf.  */
 127
 128   /* Both DSOs are loaded, which is used?  */
 129   pw = getpwnam ("test2");
 130   TEST_VERIFY (pw != NULL);
 131   if (pw)
 132     TEST_VERIFY (pw->pw_uid != 2468);
 133
 134   /* We should still be using the old configuration.  */
 135   pw = getpwnam ("test1");
 136   TEST_VERIFY (pw != NULL);
 137   if (pw)
 138     TEST_COMPARE (pw->pw_uid, 1234);
 139   gr = getgrgid (5);
 140   TEST_VERIFY (gr != NULL);
 141   gr = getgrnam ("name4");
 142   TEST_VERIFY (gr == NULL);
 143
 144   /* hosts in the outer nsswitch is files; the inner one is test1.
 145      Verify that we're still using the outer nsswitch *and* that we
 146      can load the files DSO. */
 147   he = gethostbyname ("test2");
 148   TEST_VERIFY (he != NULL);
 149
 150   return 0;
 151 }
 152
 153 #include <support/test-driver.c>