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systemd/src/test/test-namespace.c
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <fcntl.h>
#include <sched.h>
#include <stdlib.h>
#include <sys/prctl.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sysexits.h>
#include <unistd.h>
#include "sd-id128.h"
#include "alloc-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "libmount-util.h"
#include "namespace-util.h"
#include "namespace.h"
#include "pidref.h"
#include "process-util.h"
#include "string-util.h"
#include "tests.h"
#include "tmpfile-util.h"
#include "uid-range.h"
#include "user-util.h"
#include "virt.h"
TEST(namespace_cleanup_tmpdir) {
{
_cleanup_(namespace_cleanup_tmpdirp) char *dir = NULL;
ASSERT_NOT_NULL(dir = strdup(RUN_SYSTEMD_EMPTY));
}
{
_cleanup_(namespace_cleanup_tmpdirp) char *dir = NULL;
ASSERT_OK(mkdtemp_malloc("/tmp/systemd-test-namespace.XXXXXX", &dir));
}
}
static void test_tmpdir_one(const char *id, const char *A, const char *B) {
_cleanup_free_ char *a, *b;
struct stat x, y;
char *c, *d;
ASSERT_OK(setup_tmp_dir_one(id, "/tmp", &a));
ASSERT_OK(setup_tmp_dir_one(id, "/var/tmp", &b));
ASSERT_OK_ERRNO(stat(a, &x));
ASSERT_OK_ERRNO(stat(b, &y));
ASSERT_TRUE(S_ISDIR(x.st_mode));
ASSERT_TRUE(S_ISDIR(y.st_mode));
if (!streq(a, RUN_SYSTEMD_EMPTY)) {
ASSERT_TRUE(startswith(a, A));
ASSERT_EQ((x.st_mode & 01777), 0700U);
ASSERT_NOT_NULL(c = strjoina(a, "/tmp"));
ASSERT_OK_ERRNO(stat(c, &x));
ASSERT_TRUE(S_ISDIR(x.st_mode));
ASSERT_TRUE(FLAGS_SET(x.st_mode, 01777));
ASSERT_OK_ERRNO(rmdir(c));
ASSERT_OK_ERRNO(rmdir(a));
}
if (!streq(b, RUN_SYSTEMD_EMPTY)) {
ASSERT_TRUE(startswith(b, B));
ASSERT_EQ((y.st_mode & 01777), 0700U);
ASSERT_NOT_NULL(d = strjoina(b, "/tmp"));
ASSERT_OK_ERRNO(stat(d, &y));
ASSERT_TRUE(S_ISDIR(y.st_mode));
ASSERT_TRUE(FLAGS_SET(y.st_mode, 01777));
ASSERT_OK_ERRNO(rmdir(d));
ASSERT_OK_ERRNO(rmdir(b));
}
}
TEST(tmpdir) {
_cleanup_free_ char *x = NULL, *y = NULL, *z = NULL, *zz = NULL;
sd_id128_t bid;
ASSERT_OK(sd_id128_get_boot(&bid));
ASSERT_NOT_NULL(x = strjoin("/tmp/systemd-private-", SD_ID128_TO_STRING(bid), "-abcd.service-"));
ASSERT_NOT_NULL(y = strjoin("/var/tmp/systemd-private-", SD_ID128_TO_STRING(bid), "-abcd.service-"));
test_tmpdir_one("abcd.service", x, y);
ASSERT_NOT_NULL(z = strjoin("/tmp/systemd-private-", SD_ID128_TO_STRING(bid), "-sys-devices-pci0000:00-0000:00:1a.0-usb3-3\\x2d1-3\\x2d1:1.0-bluetooth-hci0.device-"));
ASSERT_NOT_NULL(zz = strjoin("/var/tmp/systemd-private-", SD_ID128_TO_STRING(bid), "-sys-devices-pci0000:00-0000:00:1a.0-usb3-3\\x2d1-3\\x2d1:1.0-bluetooth-hci0.device-"));
test_tmpdir_one("sys-devices-pci0000:00-0000:00:1a.0-usb3-3\\x2d1-3\\x2d1:1.0-bluetooth-hci0.device", z, zz);
}
static void test_shareable_ns(unsigned long nsflag) {
_cleanup_close_pair_ int s[2] = EBADF_PAIR;
bool permission_denied = false;
_cleanup_(pidref_done) PidRef pidref1 = PIDREF_NULL, pidref2 = PIDREF_NULL, pidref3 = PIDREF_NULL;
int r, n = 0;
siginfo_t si;
if (geteuid() > 0) {
(void) log_tests_skipped("not root");
return;
}
ASSERT_OK_ERRNO(socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, s));
r = ASSERT_OK(pidref_safe_fork("(share-ns-1)", FORK_LOG|FORK_DEATHSIG_SIGKILL, &pidref1));
if (r == 0) {
r = setup_shareable_ns(s, nsflag);
if (!ERRNO_IS_PRIVILEGE(r))
ASSERT_OK(r);
_exit(r >= 0 ? r : EX_NOPERM);
}
r = ASSERT_OK(pidref_safe_fork("(share-ns-2)", FORK_LOG|FORK_DEATHSIG_SIGKILL, &pidref2));
if (r == 0) {
r = setup_shareable_ns(s, nsflag);
if (!ERRNO_IS_PRIVILEGE(r))
ASSERT_OK(r);
_exit(r >= 0 ? r : EX_NOPERM);
}
r = ASSERT_OK(pidref_safe_fork("(share-ns-3)", FORK_LOG|FORK_DEATHSIG_SIGKILL, &pidref3));
if (r == 0) {
r = setup_shareable_ns(s, nsflag);
if (!ERRNO_IS_PRIVILEGE(r))
ASSERT_OK(r);
_exit(r >= 0 ? r : EX_NOPERM);
}
ASSERT_OK(pidref_wait_for_terminate(&pidref1, &si));
ASSERT_EQ(si.si_code, CLD_EXITED);
if (si.si_status == EX_NOPERM)
permission_denied = true;
else
n += si.si_status;
ASSERT_OK(pidref_wait_for_terminate(&pidref2, &si));
ASSERT_EQ(si.si_code, CLD_EXITED);
if (si.si_status == EX_NOPERM)
permission_denied = true;
else
n += si.si_status;
ASSERT_OK(pidref_wait_for_terminate(&pidref3, &si));
ASSERT_EQ(si.si_code, CLD_EXITED);
if (si.si_status == EX_NOPERM)
permission_denied = true;
else
n += si.si_status;
/* LSMs can cause setup_shareable_ns() to fail with permission denied, do not fail the test in that
* case (e.g.: LXC with AppArmor on kernel < v6.2). */
if (permission_denied)
return (void) log_tests_skipped("insufficient privileges");
ASSERT_EQ(n, 1);
}
TEST(netns) {
test_shareable_ns(CLONE_NEWNET);
}
TEST(ipcns) {
test_shareable_ns(CLONE_NEWIPC);
}
TEST(fd_is_namespace) {
_cleanup_close_ int fd = -EBADF;
ASSERT_OK_ZERO(fd_is_namespace(STDIN_FILENO, NAMESPACE_NET));
ASSERT_OK_ZERO(fd_is_namespace(STDOUT_FILENO, NAMESPACE_NET));
ASSERT_OK_ZERO(fd_is_namespace(STDERR_FILENO, NAMESPACE_NET));
fd = namespace_open_by_type(NAMESPACE_MOUNT);
if (IN_SET(fd, -ENOSYS, -ENOPKG)) {
log_notice("Path %s not found, skipping test", "/proc/self/ns/mnt");
return;
}
ASSERT_OK(fd);
ASSERT_OK_POSITIVE(fd_is_namespace(fd, NAMESPACE_MOUNT));
ASSERT_OK_ZERO(fd_is_namespace(fd, NAMESPACE_NET));
fd = safe_close(fd);
ASSERT_OK(fd = namespace_open_by_type(NAMESPACE_IPC));
ASSERT_OK_POSITIVE(fd_is_namespace(fd, NAMESPACE_IPC));
fd = safe_close(fd);
ASSERT_OK(fd = namespace_open_by_type(NAMESPACE_NET));
ASSERT_OK_POSITIVE(fd_is_namespace(fd, NAMESPACE_NET));
}
TEST(protect_kernel_logs) {
static const NamespaceParameters p = {
.runtime_scope = RUNTIME_SCOPE_SYSTEM,
.protect_kernel_logs = true,
};
int r;
if (geteuid() > 0) {
(void) log_tests_skipped("not root");
return;
}
/* In a container we likely don't have access to /dev/kmsg */
if (detect_container() > 0) {
(void) log_tests_skipped("in container");
return;
}
r = dlopen_libmount();
if (ERRNO_IS_NEG_NOT_SUPPORTED(r)) {
(void) log_tests_skipped("libmount support not compiled in");
return;
}
ASSERT_OK(r);
r = ASSERT_OK(pidref_safe_fork("(protect)", FORK_WAIT|FORK_LOG|FORK_DEATHSIG_SIGKILL, /* ret= */ NULL));
if (r == 0) {
_cleanup_close_ int fd = -EBADF;
ASSERT_OK_ERRNO(fd = open("/dev/kmsg", O_RDONLY | O_CLOEXEC));
ASSERT_OK_ZERO(setup_namespace(&p, NULL));
ASSERT_OK_ERRNO(setresuid(UID_NOBODY, UID_NOBODY, UID_NOBODY));
ASSERT_ERROR_ERRNO(open("/dev/kmsg", O_RDONLY | O_CLOEXEC), EACCES);
_exit(EXIT_SUCCESS);
}
}
TEST(idmapping_supported) {
ASSERT_OK(is_idmapping_supported("/run"));
ASSERT_OK(is_idmapping_supported("/var/lib"));
ASSERT_OK(is_idmapping_supported("/var/cache"));
ASSERT_OK(is_idmapping_supported("/var/log"));
ASSERT_OK(is_idmapping_supported("/etc"));
}
TEST(namespace_is_init) {
int r;
for (NamespaceType t = 0; t < _NAMESPACE_TYPE_MAX; t++) {
r = namespace_is_init(t);
if (r == -EBADR)
log_info_errno(r, "In root namespace of type '%s': don't know", namespace_info[t].proc_name);
else {
ASSERT_OK(r);
log_info("In root namespace of type '%s': %s", namespace_info[t].proc_name, yes_no(r));
}
}
}
TEST(userns_get_base_uid) {
_cleanup_close_ int fd = -EBADF;
fd = userns_acquire("0 1 1", "0 2 1", /* setgroups_deny= */ true);
if (ERRNO_IS_NEG_NOT_SUPPORTED(fd))
return (void) log_tests_skipped("userns is not supported");
if (ERRNO_IS_NEG_PRIVILEGE(fd))
return (void) log_tests_skipped("lacking userns privileges");
uid_t base_uid, base_gid;
ASSERT_OK(userns_get_base_uid(fd, &base_uid, &base_gid));
ASSERT_EQ(base_uid, 1U);
ASSERT_EQ(base_gid, 2U);
ASSERT_ERROR(userns_get_base_uid(fd, &base_uid, NULL), EUCLEAN);
fd = safe_close(fd);
fd = userns_acquire_empty();
ASSERT_OK(fd);
ASSERT_ERROR(userns_get_base_uid(fd, &base_uid, &base_gid), ENOMSG);
}
TEST(process_is_owned_by_uid) {
int r;
/* Test our own PID */
_cleanup_(pidref_done) PidRef pid = PIDREF_NULL;
ASSERT_OK(pidref_set_self(&pid));
ASSERT_OK_POSITIVE(process_is_owned_by_uid(&pid, getuid()));
pidref_done(&pid);
if (getuid() != 0)
return (void) log_tests_skipped("lacking userns privileges");
_cleanup_(uid_range_freep) UIDRange *range = NULL;
ASSERT_OK(uid_range_load_userns(/* path= */ NULL, UID_RANGE_USERNS_INSIDE, &range));
if (!uid_range_contains(range, 1))
return (void) log_tests_skipped("UID 1 not included in userns UID delegation, skipping test");
/* Test a child that runs as uid 1 */
_cleanup_close_pair_ int p[2] = EBADF_PAIR;
ASSERT_OK_ERRNO(pipe2(p, O_CLOEXEC));
r = pidref_safe_fork("(child)", FORK_RESET_SIGNALS|FORK_DEATHSIG_SIGKILL, &pid);
ASSERT_OK(r);
if (r == 0) {
p[0] = safe_close(p[0]);
ASSERT_OK(fully_set_uid_gid(1, 1, NULL, 0));
/* After successfully changing id/gid DEATHSIG is reset, so it has to be set again */
ASSERT_OK_ERRNO(prctl(PR_SET_PDEATHSIG, SIGKILL));
ASSERT_OK_EQ_ERRNO(write(p[1], &(const char[]) { 'x' }, 1), 1);
p[1] = safe_close(p[1]);
freeze();
}
p[1] = safe_close(p[1]);
char x = 0;
ASSERT_OK_EQ_ERRNO(read(p[0], &x, 1), 1);
ASSERT_EQ(x, 'x');
p[0] = safe_close(p[0]);
ASSERT_OK_ZERO(process_is_owned_by_uid(&pid, getuid()));
ASSERT_OK(pidref_kill(&pid, SIGKILL));
ASSERT_OK(pidref_wait_for_terminate(&pid, NULL));
/* Test a child that runs in a userns as uid 1, but the userns is owned by us */
ASSERT_OK_ERRNO(pipe2(p, O_CLOEXEC));
_cleanup_close_pair_ int pp[2] = EBADF_PAIR;
ASSERT_OK_ERRNO(pipe2(pp, O_CLOEXEC));
r = pidref_safe_fork("(child)", FORK_RESET_SIGNALS|FORK_DEATHSIG_SIGKILL|FORK_NEW_USERNS, &pid);
ASSERT_OK(r);
if (r == 0) {
p[0] = safe_close(p[0]);
pp[1] = safe_close(pp[1]);
x = 0;
ASSERT_OK_EQ_ERRNO(read(pp[0], &x, 1), 1);
ASSERT_EQ(x, 'x');
pp[0] = safe_close(pp[0]);
ASSERT_OK(reset_uid_gid());
/* After successfully changing id/gid DEATHSIG is reset, so it has to be set again */
ASSERT_OK_ERRNO(prctl(PR_SET_PDEATHSIG, SIGKILL));
ASSERT_OK_EQ_ERRNO(write(p[1], &(const char[]) { 'x' }, 1), 1);
p[1] = safe_close(p[1]);
freeze();
}
p[1] = safe_close(p[1]);
pp[0] = safe_close(pp[0]);
ASSERT_OK(write_string_file(procfs_file_alloca(pid.pid, "uid_map"), "0 1 1\n", 0));
ASSERT_OK(write_string_file(procfs_file_alloca(pid.pid, "setgroups"), "deny", 0));
ASSERT_OK(write_string_file(procfs_file_alloca(pid.pid, "gid_map"), "0 1 1\n", 0));
ASSERT_OK_EQ_ERRNO(write(pp[1], &(const char[]) { 'x' }, 1), 1);
pp[1] = safe_close(pp[1]);
x = 0;
ASSERT_OK_EQ_ERRNO(read(p[0], &x, 1), 1);
ASSERT_EQ(x, 'x');
p[0] = safe_close(p[0]);
ASSERT_OK_POSITIVE(process_is_owned_by_uid(&pid, getuid()));
ASSERT_OK(pidref_kill(&pid, SIGKILL));
ASSERT_OK(pidref_wait_for_terminate(&pid, NULL));
}
TEST(namespace_get_leader) {
int r;
_cleanup_(pidref_done) PidRef original = PIDREF_NULL;
ASSERT_OK(pidref_set_self(&original));
_cleanup_(pidref_done) PidRef pid = PIDREF_NULL;
r = pidref_safe_fork("(child)", FORK_RESET_SIGNALS|FORK_DEATHSIG_SIGKILL|FORK_NEW_MOUNTNS|FORK_WAIT|FORK_LOG, &pid);
ASSERT_OK(r);
if (r == 0) {
_cleanup_(pidref_done) PidRef pid2 = PIDREF_NULL;
r = pidref_safe_fork("(child)", FORK_RESET_SIGNALS|FORK_DEATHSIG_SIGKILL|FORK_WAIT|FORK_LOG, &pid2);
ASSERT_OK(r);
if (r == 0) {
log_info("PID hierarchy: " PID_FMT " ← " PID_FMT " ← " PID_FMT, original.pid, pid.pid, pid2.pid);
_cleanup_(pidref_done) PidRef self = PIDREF_NULL;
ASSERT_OK(pidref_set_self(&self));
ASSERT_TRUE(pidref_equal(&self, &pid2));
_cleanup_(pidref_done) PidRef parent = PIDREF_NULL;
ASSERT_OK(pidref_set_parent(&parent));
ASSERT_TRUE(pidref_equal(&parent, &pid));
ASSERT_TRUE(!pidref_equal(&self, &pid));
ASSERT_TRUE(!pidref_equal(&self, &parent));
_cleanup_(pidref_done) PidRef grandparent = PIDREF_NULL;
ASSERT_OK(pidref_get_ppid_as_pidref(&parent, &grandparent));
ASSERT_TRUE(pidref_equal(&grandparent, &original));
ASSERT_TRUE(!pidref_equal(&grandparent, &self));
ASSERT_TRUE(!pidref_equal(&grandparent, &pid));
ASSERT_TRUE(!pidref_equal(&grandparent, &pid2));
ASSERT_TRUE(!pidref_equal(&grandparent, &parent));
_cleanup_(pidref_done) PidRef leader = PIDREF_NULL;
ASSERT_OK(namespace_get_leader(&self, NAMESPACE_MOUNT, &leader));
ASSERT_TRUE(pidref_equal(&parent, &leader));
ASSERT_TRUE(pidref_equal(&pid, &leader));
ASSERT_TRUE(!pidref_equal(&self, &leader));
ASSERT_TRUE(!pidref_equal(&pid2, &leader));
ASSERT_TRUE(!pidref_equal(&original, &leader));
ASSERT_TRUE(!pidref_equal(&grandparent, &leader));
_exit(EXIT_SUCCESS);
}
_exit(EXIT_SUCCESS);
}
}
TEST(detach_mount_namespace_harder) {
_cleanup_(pidref_done_sigkill_wait) PidRef pid = PIDREF_NULL;
_cleanup_close_pair_ int p[2] = EBADF_PAIR;
char x = 0;
int r;
ASSERT_OK_ERRNO(pipe2(p, O_CLOEXEC));
ASSERT_OK(r = pidref_safe_fork("(child)", FORK_RESET_SIGNALS|FORK_DEATHSIG_SIGKILL|FORK_LOG, &pid));
if (r == 0) {
p[0] = safe_close(p[0]);
ASSERT_OK(detach_mount_namespace_harder(0, 0));
ASSERT_OK_EQ_ERRNO(write(p[1], &(const char[]) { 'x' }, 1), 1);
freeze();
}
p[1] = safe_close(p[1]);
ASSERT_OK_EQ_ERRNO(read(p[0], &x, 1), 1);
ASSERT_EQ(x, 'x');
ASSERT_OK_POSITIVE(pidref_in_same_namespace(NULL, &pid, NAMESPACE_USER));
ASSERT_OK_ZERO(pidref_in_same_namespace(NULL, &pid, NAMESPACE_MOUNT));
}
static int intro(void) {
if (!have_namespaces())
return log_tests_skipped("Don't have namespace support or lacking privileges");
return EXIT_SUCCESS;
}
DEFINE_TEST_MAIN_WITH_INTRO(LOG_INFO, intro);
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