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
38static char MAGIC_ARGUMENT[] = "run-actual-test";
39
40static int
41do_test (void)
42{
43 if (getenv ("PATH") == NULL)
44 {
45 printf (format: "PATH not set\n");
46 exit (1);
47 }
48 if (secure_getenv (name: "PATH") == NULL)
49 {
50 printf (format: "PATH not set according to secure_getenv\n");
51 exit (1);
52 }
53 if (strcmp (getenv ("PATH"), secure_getenv (name: "PATH")) != 0)
54 {
55 printf (format: "PATH mismatch (%s, %s)\n",
56 getenv ("PATH"), secure_getenv (name: "PATH"));
57 exit (1);
58 }
59
60 int status = support_capture_subprogram_self_sgid (child_id: 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
71static void
72alternative_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 (name: "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>
91

source code of glibc/stdlib/tst-secure-getenv.c