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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
Copyright 2016 Daniel Mack
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 <linux/libbpf.h>
#include <string.h>
#include <unistd.h>
#include "bpf-firewall.h"
#include "bpf-program.h"
#include "load-fragment.h"
#include "manager.h"
#include "rm-rf.h"
#include "service.h"
#include "test-helper.h"
#include "tests.h"
#include "unit.h"
int main(int argc, char *argv[]) {
struct bpf_insn exit_insn[] = {
BPF_MOV64_IMM(BPF_REG_0, 1),
BPF_EXIT_INSN()
};
_cleanup_(rm_rf_physical_and_freep) char *runtime_dir = NULL;
CGroupContext *cc = NULL;
_cleanup_(bpf_program_unrefp) BPFProgram *p = NULL;
_cleanup_(manager_freep) Manager *m = NULL;
Unit *u;
char log_buf[65535];
int r;
log_set_max_level(LOG_DEBUG);
log_parse_environment();
log_open();
r = enter_cgroup_subroot();
if (r == -ENOMEDIUM) {
log_notice("cgroupfs not available, skipping tests");
return EXIT_TEST_SKIP;
}
assert_se(set_unit_path(get_testdata_dir("")) >= 0);
assert_se(runtime_dir = setup_fake_runtime_dir());
r = bpf_program_new(BPF_PROG_TYPE_CGROUP_SKB, &p);
assert(r == 0);
r = bpf_program_add_instructions(p, exit_insn, ELEMENTSOF(exit_insn));
assert(r == 0);
if (getuid() != 0) {
log_notice("Not running as root, skipping kernel related tests.");
return EXIT_TEST_SKIP;
}
r = bpf_firewall_supported();
if (r == BPF_FIREWALL_UNSUPPORTED) {
log_notice("BPF firewalling not supported, skipping");
return EXIT_TEST_SKIP;
}
assert_se(r > 0);
if (r == BPF_FIREWALL_SUPPORTED_WITH_MULTI)
log_notice("BPF firewalling with BPF_F_ALLOW_MULTI supported. Yay!");
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(r >= 0);
p = bpf_program_unref(p);
/* The simple tests suceeded. Now let's try full unit-based use-case. */
assert_se(manager_new(UNIT_FILE_USER, true, &m) >= 0);
assert_se(manager_startup(m, 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_ip_address_access(u->id, "filename", 1, "Service", 1, "IPAddressAllow", 0, "10.0.1.0/24", &cc->ip_address_allow, NULL) == 0);
assert_se(config_parse_ip_address_access(u->id, "filename", 1, "Service", 1, "IPAddressAllow", 0, "127.0.0.2", &cc->ip_address_allow, NULL) == 0);
assert_se(config_parse_ip_address_access(u->id, "filename", 1, "Service", 1, "IPAddressDeny", 0, "127.0.0.3", &cc->ip_address_deny, NULL) == 0);
assert_se(config_parse_ip_address_access(u->id, "filename", 1, "Service", 1, "IPAddressDeny", 0, "10.0.3.2/24", &cc->ip_address_deny, NULL) == 0);
assert_se(config_parse_ip_address_access(u->id, "filename", 1, "Service", 1, "IPAddressDeny", 0, "127.0.0.1/25", &cc->ip_address_deny, NULL) == 0);
assert_se(config_parse_ip_address_access(u->id, "filename", 1, "Service", 1, "IPAddressDeny", 0, "127.0.0.4", &cc->ip_address_deny, NULL) == 0);
assert(cc->ip_address_allow);
assert(cc->ip_address_allow->items_next);
assert(!cc->ip_address_allow->items_next->items_next);
/* The deny list is defined redundantly, let's ensure it got properly reduced */
assert(cc->ip_address_deny);
assert(cc->ip_address_deny->items_next);
assert(!cc->ip_address_deny->items_next->items_next);
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 ))
/* Kernel doesn't support the necessary bpf bits, or masked out via seccomp? */
return EXIT_TEST_SKIP;
assert_se(r >= 0);
assert(u->ip_bpf_ingress);
assert(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(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(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);
return 0;
}
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