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/***
This file is part of systemd.
Copyright 2014 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <sys/prctl.h>
#include "basic/alloc-util.h"
#include "basic/cap-list.h"
#include "basic/capability-util.h"
#include "basic/fileio.h"
#include "basic/parse-util.h"
#include "basic/util.h"
/* verify the capability parser */
static void test_cap_list(void) {
int i;
assert_se(!capability_to_name(-1));
assert_se(!capability_to_name(capability_list_length()));
for (i = 0; i < capability_list_length(); i++) {
const char *n;
assert_se(n = capability_to_name(i));
assert_se(capability_from_name(n) == i);
printf("%s = %i\n", n, i);
}
assert_se(capability_from_name("asdfbsd") == -EINVAL);
assert_se(capability_from_name("CAP_AUDIT_READ") == CAP_AUDIT_READ);
assert_se(capability_from_name("cap_audit_read") == CAP_AUDIT_READ);
assert_se(capability_from_name("cAp_aUdIt_rEAd") == CAP_AUDIT_READ);
assert_se(capability_from_name("0") == 0);
assert_se(capability_from_name("15") == 15);
assert_se(capability_from_name("-1") == -EINVAL);
for (i = 0; i < capability_list_length(); i++) {
_cleanup_cap_free_charp_ char *a = NULL;
const char *b;
unsigned u;
assert_se(a = cap_to_name(i));
/* quit the loop as soon as libcap starts returning
* numeric ids, formatted as strings */
if (safe_atou(a, &u) >= 0)
break;
assert_se(b = capability_to_name(i));
printf("%s vs. %s\n", a, b);
assert_se(strcasecmp(a, b) == 0);
}
}
/* verify cap_last_cap() against /proc/sys/kernel/cap_last_cap */
static void test_last_cap_file(void) {
_cleanup_free_ char *content = NULL;
unsigned long val = 0;
int r;
r = read_one_line_file("/proc/sys/kernel/cap_last_cap", &content);
assert_se(r >= 0);
r = safe_atolu(content, &val);
assert_se(r >= 0);
assert_se(val != 0);
assert_se(val == cap_last_cap());
}
/* verify cap_last_cap() against syscall probing */
static void test_last_cap_probe(void) {
unsigned long p = (unsigned long)CAP_LAST_CAP;
if (prctl(PR_CAPBSET_READ, p) < 0) {
for (p--; p > 0; p --)
if (prctl(PR_CAPBSET_READ, p) >= 0)
break;
} else {
for (;; p++)
if (prctl(PR_CAPBSET_READ, p+1) < 0)
break;
}
assert_se(p != 0);
assert_se(p == cap_last_cap());
}
int main(int argc, char *argv[]) {
test_cap_list();
test_last_cap_file();
test_last_cap_probe();
return 0;
}
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