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Diffstat (limited to 'src/test/test-capability.c')
| -rw-r--r-- | src/test/test-capability.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/src/test/test-capability.c b/src/test/test-capability.c new file mode 100644 index 0000000000..a362fc6c57 --- /dev/null +++ b/src/test/test-capability.c @@ -0,0 +1,161 @@ +/*** + This file is part of systemd + + Copyright 2014 Ronny Chevalier + + 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/types.h> +#include <sys/wait.h> +#include <sys/capability.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <pwd.h> +#include <unistd.h> + +#include "capability.h" +#include "util.h" +#include "macro.h" + +static uid_t test_uid = -1; +static gid_t test_gid = -1; +// We keep CAP_DAC_OVERRIDE to avoid errors with gcov when doing test coverage +static uint64_t test_flags = 1ULL << CAP_DAC_OVERRIDE; + +static void fork_test(void (*test_func)(void)) { + pid_t pid = 0; + + pid = fork(); + assert_se(pid >= 0); + if (pid == 0) { + test_func(); + exit(0); + } else if (pid > 0) { + int status; + + assert_se(waitpid(pid, &status, 0) > 0); + assert_se(WIFEXITED(status) && WEXITSTATUS(status) == 0); + } +} + +static void show_capabilities(void) { + cap_t caps; + char *text; + + caps = cap_get_proc(); + assert_se(caps); + + text = cap_to_text(caps, NULL); + assert_se(text); + + log_info("Capabilities:%s", text); + cap_free(caps); + cap_free(text); +} + +static int setup_tests(void) { + struct passwd *nobody; + + nobody = getpwnam("nobody"); + if (!nobody) { + log_error("Could not find nobody user: %m"); + return -EXIT_TEST_SKIP; + } + test_uid = nobody->pw_uid; + test_gid = nobody->pw_gid; + + return 0; +} + +static void test_drop_privileges_keep_net_raw(void) { + int sock; + + sock = socket(AF_INET, SOCK_RAW, IPPROTO_UDP); + assert_se(sock >= 0); + safe_close(sock); + + assert_se(drop_privileges(test_uid, test_gid, test_flags | (1ULL << CAP_NET_RAW)) >= 0); + assert_se(getuid() == test_uid); + assert_se(getgid() == test_gid); + show_capabilities(); + + sock = socket(AF_INET, SOCK_RAW, IPPROTO_UDP); + assert_se(sock >= 0); + safe_close(sock); +} + +static void test_drop_privileges_dontkeep_net_raw(void) { + int sock; + + sock = socket(AF_INET, SOCK_RAW, IPPROTO_UDP); + assert_se(sock >= 0); + safe_close(sock); + + assert_se(drop_privileges(test_uid, test_gid, test_flags) >= 0); + assert_se(getuid() == test_uid); + assert_se(getgid() == test_gid); + show_capabilities(); + + sock = socket(AF_INET, SOCK_RAW, IPPROTO_UDP); + assert_se(sock < 0); +} + +static void test_drop_privileges_fail(void) { + assert_se(drop_privileges(test_uid, test_gid, test_flags) >= 0); + assert_se(getuid() == test_uid); + assert_se(getgid() == test_gid); + + assert_se(drop_privileges(test_uid, test_gid, test_flags) < 0); + assert_se(drop_privileges(0, 0, test_flags) < 0); +} + +static void test_drop_privileges(void) { + fork_test(test_drop_privileges_keep_net_raw); + fork_test(test_drop_privileges_dontkeep_net_raw); + fork_test(test_drop_privileges_fail); +} + +static void test_have_effective_cap(void) { + assert_se(have_effective_cap(CAP_KILL)); + assert_se(have_effective_cap(CAP_CHOWN)); + + assert_se(drop_privileges(test_uid, test_gid, test_flags | (1ULL << CAP_KILL)) >= 0); + assert_se(getuid() == test_uid); + assert_se(getgid() == test_gid); + + assert_se(have_effective_cap(CAP_KILL)); + assert_se(!have_effective_cap(CAP_CHOWN)); +} + +int main(int argc, char *argv[]) { + int r; + + log_parse_environment(); + log_open(); + + if (getuid() != 0) + return EXIT_TEST_SKIP; + + r = setup_tests(); + if (r < 0) + return -r; + + show_capabilities(); + + test_drop_privileges(); + fork_test(test_have_effective_cap); + + return 0; +} |