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