1 // SPDX-License-Identifier: GPL-2.0
2 #include <cap-ng.h>
3 #include <linux/capability.h>
4 #include <stdbool.h>
5 #include <string.h>
6 #include <stdio.h>
7 #include <sys/prctl.h>
8 #include <sys/auxv.h>
9 
10 #include "../kselftest.h"
11 
12 #ifndef PR_CAP_AMBIENT
13 #define PR_CAP_AMBIENT			47
14 # define PR_CAP_AMBIENT_IS_SET		1
15 # define PR_CAP_AMBIENT_RAISE		2
16 # define PR_CAP_AMBIENT_LOWER		3
17 # define PR_CAP_AMBIENT_CLEAR_ALL	4
18 #endif
19 
20 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 19)
21 # define HAVE_GETAUXVAL
22 #endif
23 
bool_arg(char ** argv,int i)24 static bool bool_arg(char **argv, int i)
25 {
26 	if (!strcmp(argv[i], "0"))
27 		return false;
28 	else if (!strcmp(argv[i], "1"))
29 		return true;
30 	else {
31 		ksft_exit_fail_msg("wrong argv[%d]\n", i);
32 		return false;
33 	}
34 }
35 
main(int argc,char ** argv)36 int main(int argc, char **argv)
37 {
38 	const char *atsec = "";
39 
40 	/*
41 	 * Be careful just in case a setgid or setcapped copy of this
42 	 * helper gets out.
43 	 */
44 
45 	if (argc != 5)
46 		ksft_exit_fail_msg("wrong argc\n");
47 
48 #ifdef HAVE_GETAUXVAL
49 	if (getauxval(AT_SECURE))
50 		atsec = " (AT_SECURE is set)";
51 	else
52 		atsec = " (AT_SECURE is not set)";
53 #endif
54 
55 	capng_get_caps_process();
56 
57 	if (capng_have_capability(CAPNG_EFFECTIVE, CAP_NET_BIND_SERVICE) != bool_arg(argv, 1)) {
58 		ksft_print_msg("Wrong effective state%s\n", atsec);
59 		return 1;
60 	}
61 
62 	if (capng_have_capability(CAPNG_PERMITTED, CAP_NET_BIND_SERVICE) != bool_arg(argv, 2)) {
63 		ksft_print_msg("Wrong permitted state%s\n", atsec);
64 		return 1;
65 	}
66 
67 	if (capng_have_capability(CAPNG_INHERITABLE, CAP_NET_BIND_SERVICE) != bool_arg(argv, 3)) {
68 		ksft_print_msg("Wrong inheritable state%s\n", atsec);
69 		return 1;
70 	}
71 
72 	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, CAP_NET_BIND_SERVICE, 0, 0, 0) != bool_arg(argv, 4)) {
73 		ksft_print_msg("Wrong ambient state%s\n", atsec);
74 		return 1;
75 	}
76 
77 	ksft_print_msg("%s: Capabilities after execve were correct\n",
78 			"validate_cap:");
79 	return 0;
80 }
81