stdlib/tst-secure-getenv.c

   1 /* Copyright (C) 2012-2022 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 /* Test that secure_getenv works by invoking the test as a SGID
  19    program with a group ID from the supplementary group list.  This
  20    test can fail spuriously if the user is not a member of a suitable
  21    supplementary group.  */
  22
  23 #include <errno.h>
  24 #include <fcntl.h>
  25 #include <stdlib.h>
  26 #include <stdint.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <sys/stat.h>
  30 #include <sys/wait.h>
  31 #include <unistd.h>
  32
  33 #include <support/check.h>
  34 #include <support/support.h>
  35 #include <support/capture_subprocess.h>
  36 #include <support/test-driver.h>
  37
  38 static char MAGIC_ARGUMENT[] = "run-actual-test";
  39
  40 static int
  41 do_test (void)
  42 {
  43   if (getenv ("PATH") == NULL)
  44     {
  45       printf ("PATH not set\n");
  46       exit (1);
  47     }
  48   if (secure_getenv ("PATH") == NULL)
  49     {
  50       printf ("PATH not set according to secure_getenv\n");
  51       exit (1);
  52     }
  53   if (strcmp (getenv ("PATH"), secure_getenv ("PATH")) != 0)
  54     {
  55       printf ("PATH mismatch (%s, %s)\n",
  56               getenv ("PATH"), secure_getenv ("PATH"));
  57       exit (1);
  58     }
  59
  60   int status = support_capture_subprogram_self_sgid (MAGIC_ARGUMENT);
  61
  62   if (WEXITSTATUS (status) == EXIT_UNSUPPORTED)
  63     return EXIT_UNSUPPORTED;
  64
  65   if (!WIFEXITED (status))
  66     FAIL_EXIT1 ("Unexpected exit status %d from child process\n", status);
  67
  68   return 0;
  69 }
  70
  71 static void
  72 alternative_main (int argc, char **argv)
  73 {
  74   if (argc == 2 && strcmp (argv[1], MAGIC_ARGUMENT) == 0)
  75     {
  76       if (getgid () == getegid ())
  77         /* This can happen if the file system is mounted nosuid.  */
  78         FAIL_UNSUPPORTED ("SGID failed: GID and EGID match (%jd)\n",
  79                    (intmax_t) getgid ());
  80       if (getenv ("PATH") == NULL)
  81         FAIL_EXIT (3, "PATH variable not present\n");
  82       if (secure_getenv ("PATH") != NULL)
  83         FAIL_EXIT (4, "PATH variable not filtered out\n");
  84
  85       exit (EXIT_SUCCESS);
  86     }
  87 }
  88
  89 #define PREPARE alternative_main
  90 #include <support/test-driver.c>