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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <linux/bpf_insn.h>
#include <string.h>
#include <unistd.h>
#include "bpf-firewall.h"
#include "bpf-program.h"
#include "in-addr-prefix-util.h"
#include "load-fragment.h"
#include "manager.h"
#include "memory-util.h"
#include "rm-rf.h"
#include "service.h"
#include "tests.h"
#include "unit-serialize.h"
#include "virt.h"
int main(int argc, char *argv[]) {
const struct bpf_insn exit_insn[] = {
BPF_MOV64_IMM(BPF_REG_0, 0), /* drop */
BPF_EXIT_INSN()
};
_cleanup_(rm_rf_physical_and_freep) char *runtime_dir = NULL;
CGroupContext *cc = NULL;
_cleanup_(bpf_program_freep) BPFProgram *p = NULL;
_cleanup_(manager_freep) Manager *m = NULL;
Unit *u;
char log_buf[65535];
struct rlimit rl;
int r;
union bpf_attr attr;
bool test_custom_filter = false;
const char *test_prog = "/sys/fs/bpf/test-dropper";
test_setup_logging(LOG_DEBUG);
if (detect_container() > 0)
return log_tests_skipped("test-bpf-firewall fails inside LXC and Docker containers: https://github.com/systemd/systemd/issues/9666");
assert_se(getrlimit(RLIMIT_MEMLOCK, &rl) >= 0);
rl.rlim_cur = rl.rlim_max = MAX(rl.rlim_max, CAN_MEMLOCK_SIZE);
(void) setrlimit(RLIMIT_MEMLOCK, &rl);
if (!can_memlock())
return log_tests_skipped("Can't use mlock()");
r = enter_cgroup_subroot(NULL);
if (r == -ENOMEDIUM)
return log_tests_skipped("cgroupfs not available");
_cleanup_free_ char *unit_dir = NULL;
assert_se(get_testdata_dir("units", &unit_dir) >= 0);
assert_se(set_unit_path(unit_dir) >= 0);
assert_se(runtime_dir = setup_fake_runtime_dir());
r = bpf_program_new(BPF_PROG_TYPE_CGROUP_SKB, "sd_trivial", &p);
assert_se(r == 0);
r = bpf_program_add_instructions(p, exit_insn, ELEMENTSOF(exit_insn));
assert_se(r == 0);
r = bpf_firewall_supported();
if (r == BPF_FIREWALL_UNSUPPORTED)
return log_tests_skipped("BPF firewalling not supported");
assert_se(r > 0);
if (r == BPF_FIREWALL_SUPPORTED_WITH_MULTI) {
log_notice("BPF firewalling with BPF_F_ALLOW_MULTI supported. Yay!");
test_custom_filter = true;
} else
log_notice("BPF firewalling (though without BPF_F_ALLOW_MULTI) supported. Good.");
r = bpf_program_load_kernel(p, log_buf, ELEMENTSOF(log_buf));
assert_se(r >= 0);
if (test_custom_filter) {
zero(attr);
attr.pathname = PTR_TO_UINT64(test_prog);
attr.bpf_fd = p->kernel_fd;
attr.file_flags = 0;
(void) unlink(test_prog);
r = bpf(BPF_OBJ_PIN, &attr, sizeof(attr));
if (r < 0) {
log_warning_errno(errno, "BPF object pinning failed, will not run custom filter test: %m");
test_custom_filter = false;
}
}
p = bpf_program_free(p);
/* The simple tests succeeded. Now let's try full unit-based use-case. */
assert_se(manager_new(LOOKUP_SCOPE_USER, MANAGER_TEST_RUN_BASIC, &m) >= 0);
assert_se(manager_startup(m, NULL, NULL, NULL) >= 0);
assert_se(u = unit_new(m, sizeof(Service)));
assert_se(unit_add_name(u, "foo.service") == 0);
assert_se(cc = unit_get_cgroup_context(u));
u->perpetual = true;
cc->ip_accounting = true;
assert_se(config_parse_in_addr_prefixes(u->id, "filename", 1, "Service", 1, "IPAddressAllow", 0, "10.0.1.0/24", &cc->ip_address_allow, NULL) == 0);
assert_se(config_parse_in_addr_prefixes(u->id, "filename", 1, "Service", 1, "IPAddressAllow", 0, "127.0.0.2", &cc->ip_address_allow, NULL) == 0);
assert_se(config_parse_in_addr_prefixes(u->id, "filename", 1, "Service", 1, "IPAddressDeny", 0, "127.0.0.3", &cc->ip_address_deny, NULL) == 0);
assert_se(config_parse_in_addr_prefixes(u->id, "filename", 1, "Service", 1, "IPAddressDeny", 0, "10.0.3.2/24", &cc->ip_address_deny, NULL) == 0);
assert_se(config_parse_in_addr_prefixes(u->id, "filename", 1, "Service", 1, "IPAddressDeny", 0, "127.0.0.1/25", &cc->ip_address_deny, NULL) == 0);
assert_se(config_parse_in_addr_prefixes(u->id, "filename", 1, "Service", 1, "IPAddressDeny", 0, "127.0.0.4", &cc->ip_address_deny, NULL) == 0);
assert_se(set_size(cc->ip_address_allow) == 2);
assert_se(set_size(cc->ip_address_deny) == 4);
/* The deny list is defined redundantly, let's ensure it will be properly reduced */
assert_se(in_addr_prefixes_reduce(cc->ip_address_allow) >= 0);
assert_se(in_addr_prefixes_reduce(cc->ip_address_deny) >= 0);
assert_se(set_size(cc->ip_address_allow) == 2);
assert_se(set_size(cc->ip_address_deny) == 2);
assert_se(set_contains(cc->ip_address_allow, &(struct in_addr_prefix) {
.family = AF_INET,
.address.in.s_addr = htobe32((UINT32_C(10) << 24) | (UINT32_C(1) << 8)),
.prefixlen = 24 }));
assert_se(set_contains(cc->ip_address_allow, &(struct in_addr_prefix) {
.family = AF_INET,
.address.in.s_addr = htobe32(0x7f000002),
.prefixlen = 32 }));
assert_se(set_contains(cc->ip_address_deny, &(struct in_addr_prefix) {
.family = AF_INET,
.address.in.s_addr = htobe32(0x7f000000),
.prefixlen = 25 }));
assert_se(set_contains(cc->ip_address_deny, &(struct in_addr_prefix) {
.family = AF_INET,
.address.in.s_addr = htobe32((UINT32_C(10) << 24) | (UINT32_C(3) << 8)),
.prefixlen = 24 }));
assert_se(config_parse_exec(u->id, "filename", 1, "Service", 1, "ExecStart", SERVICE_EXEC_START, "/bin/ping -c 1 127.0.0.2 -W 5", SERVICE(u)->exec_command, u) == 0);
assert_se(config_parse_exec(u->id, "filename", 1, "Service", 1, "ExecStart", SERVICE_EXEC_START, "/bin/ping -c 1 127.0.0.3 -W 5", SERVICE(u)->exec_command, u) == 0);
assert_se(SERVICE(u)->exec_command[SERVICE_EXEC_START]);
assert_se(SERVICE(u)->exec_command[SERVICE_EXEC_START]->command_next);
assert_se(!SERVICE(u)->exec_command[SERVICE_EXEC_START]->command_next->command_next);
SERVICE(u)->type = SERVICE_ONESHOT;
u->load_state = UNIT_LOADED;
unit_dump(u, stdout, NULL);
r = bpf_firewall_compile(u);
if (IN_SET(r, -ENOTTY, -ENOSYS, -EPERM))
return log_tests_skipped("Kernel doesn't support the necessary bpf bits (masked out via seccomp?)");
assert_se(r >= 0);
assert_se(u->ip_bpf_ingress);
assert_se(u->ip_bpf_egress);
r = bpf_program_load_kernel(u->ip_bpf_ingress, log_buf, ELEMENTSOF(log_buf));
log_notice("log:");
log_notice("-------");
log_notice("%s", log_buf);
log_notice("-------");
assert_se(r >= 0);
r = bpf_program_load_kernel(u->ip_bpf_egress, log_buf, ELEMENTSOF(log_buf));
log_notice("log:");
log_notice("-------");
log_notice("%s", log_buf);
log_notice("-------");
assert_se(r >= 0);
assert_se(unit_start(u) >= 0);
while (!IN_SET(SERVICE(u)->state, SERVICE_DEAD, SERVICE_FAILED))
assert_se(sd_event_run(m->event, UINT64_MAX) >= 0);
assert_se(SERVICE(u)->exec_command[SERVICE_EXEC_START]->exec_status.code == CLD_EXITED &&
SERVICE(u)->exec_command[SERVICE_EXEC_START]->exec_status.status == EXIT_SUCCESS);
assert_se(SERVICE(u)->exec_command[SERVICE_EXEC_START]->command_next->exec_status.code != CLD_EXITED ||
SERVICE(u)->exec_command[SERVICE_EXEC_START]->command_next->exec_status.status != EXIT_SUCCESS);
if (test_custom_filter) {
assert_se(u = unit_new(m, sizeof(Service)));
assert_se(unit_add_name(u, "custom-filter.service") == 0);
assert_se(cc = unit_get_cgroup_context(u));
u->perpetual = true;
cc->ip_accounting = true;
assert_se(config_parse_ip_filter_bpf_progs(u->id, "filename", 1, "Service", 1, "IPIngressFilterPath", 0, test_prog, &cc->ip_filters_ingress, u) == 0);
assert_se(config_parse_exec(u->id, "filename", 1, "Service", 1, "ExecStart", SERVICE_EXEC_START, "-/bin/ping -c 1 127.0.0.1 -W 5", SERVICE(u)->exec_command, u) == 0);
SERVICE(u)->type = SERVICE_ONESHOT;
u->load_state = UNIT_LOADED;
assert_se(unit_start(u) >= 0);
while (!IN_SET(SERVICE(u)->state, SERVICE_DEAD, SERVICE_FAILED))
assert_se(sd_event_run(m->event, UINT64_MAX) >= 0);
assert_se(SERVICE(u)->exec_command[SERVICE_EXEC_START]->exec_status.code != CLD_EXITED ||
SERVICE(u)->exec_command[SERVICE_EXEC_START]->exec_status.status != EXIT_SUCCESS);
(void) unlink(test_prog);
assert_se(SERVICE(u)->state == SERVICE_DEAD);
}
return 0;
}
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