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mirror of https://github.com/systemd/systemd.git synced 2024-12-22 17:35:35 +03:00

resolved: Test for DnsStream (plain TCP DNS and DoT)

Tests DnsStream event handling, both for plain TCP DNS and DNS over TLS.

The DoT test requires the "openssl s_server" command line tool to mock a simple
TLS server. Thus the test's TLS part is skipped if openssl it not available.
The test works for both DNS_OVER_TLS_USE_GNUTLS and DNS_OVER_TLS_USE_OPENSSL.

The DoT case fails due to a bug, which is fixed on the next commit.
This commit is contained in:
Joan Bruguera 2022-01-23 17:08:12 +01:00 committed by Yu Watanabe
parent 2aaf6bb6e9
commit 726bcd81b9
4 changed files with 436 additions and 1 deletions

View File

@ -70,7 +70,6 @@ systemd_resolved_sources = files('''
resolved-socket-graveyard.h
resolved-varlink.c
resolved-varlink.h
resolved.c
'''.split())
resolvectl_sources = files('''
@ -200,6 +199,14 @@ tests += [
[lib_openssl_or_gcrypt,
libm]],
[files('test-resolved-stream.c')
+ basic_dns_sources + systemd_resolved_sources,
[libshared],
[lib_openssl_or_gcrypt,
libm]
+ systemd_resolved_dependencies,
resolve_includes],
[files('test-dnssec.c'),
[libsystemd_resolve_core,
libshared],
@ -229,3 +236,5 @@ fuzzers += [
[lib_openssl_or_gcrypt,
libm]],
]
systemd_resolved_sources += files('resolved.c')

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@ -0,0 +1,342 @@
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <arpa/inet.h>
#include <fcntl.h>
#include <pthread.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <sys/prctl.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <unistd.h>
#include "fd-util.h"
#include "log.h"
#include "process-util.h"
#include "resolved-dns-packet.h"
#include "resolved-dns-question.h"
#include "resolved-dns-rr.h"
#if ENABLE_DNS_OVER_TLS
#include "resolved-dnstls.h"
#endif
#include "resolved-dns-server.h"
#include "resolved-dns-stream.h"
#include "resolved-manager.h"
#include "sd-event.h"
#include "sparse-endian.h"
#include "tests.h"
static struct sockaddr_in SERVER_ADDRESS;
/* Bytes of the questions & answers used in the test, including TCP DNS 2-byte length prefix */
static const uint8_t QUESTION_A[] = {
0x00, 0x1D, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 'e',
'x' , 'a' , 'm' , 'p' , 'l' , 'e' , 0x03, 'c' , 'o' , 'm' , 0x00, 0x00, 0x01, 0x00, 0x01
};
static const uint8_t QUESTION_AAAA[] = {
0x00, 0x1D, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 'e',
'x' , 'a' , 'm' , 'p' , 'l' , 'e' , 0x03, 'c' , 'o' , 'm' , 0x00, 0x00, 0x1C, 0x00, 0x01
};
static const uint8_t ANSWER_A[] = {
0x00, 0x2D, 0x00, 0x00, 0x81, 0x80, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x07, 'e',
'x' , 'a' , 'm' , 'p' , 'l' , 'e' , 0x03, 'c' , 'o' , 'm' , 0x00, 0x00, 0x01, 0x00, 0x01, 0xC0,
0x0C, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x52, 0x8D, 0x00, 0x04, 0x5D, 0xB8, 0xD8, 0x22,
};
static const uint8_t ANSWER_AAAA[] = {
0x00, 0x39, 0x00, 0x00, 0x81, 0x80, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x07, 'e',
'x' , 'a' , 'm' , 'p' , 'l' , 'e' , 0x03, 'c' , 'o' , 'm' , 0x00, 0x00, 0x1C, 0x00, 0x01, 0xC0,
0x0C, 0x00, 0x1C, 0x00, 0x01, 0x00, 0x00, 0x54, 0x4B, 0x00, 0x10, 0x26, 0x06, 0x28, 0x00, 0x02,
0x20, 0x00, 0x01, 0x02, 0x48, 0x18, 0x93, 0x25, 0xC8, 0x19, 0x46,
};
/**
* A mock TCP DNS server that asserts certain questions are received
* and replies with the same answer every time.
*/
static void receive_and_check_question(int fd, const uint8_t *expected_question,
size_t question_size) {
uint8_t *actual_question;
size_t n_read = 0;
actual_question = newa(uint8_t, question_size);
while (n_read < question_size) {
ssize_t r = read(fd, actual_question + n_read, question_size - n_read);
assert_se(r >= 0);
n_read += (size_t)r;
}
assert_se(n_read == question_size);
assert_se(memcmp(expected_question, actual_question, question_size) == 0);
}
static void send_answer(int fd, const uint8_t *answer, size_t answer_size) {
assert_se(write(fd, answer, answer_size) == (ssize_t)answer_size);
}
/* Sends two answers together in a single write operation,
* so they hopefully end up in a single TCP packet / TLS record */
static void send_answers_together(int fd,
const uint8_t *answer1, size_t answer1_size,
const uint8_t *answer2, size_t answer2_size) {
uint8_t *answer;
size_t answer_size = answer1_size + answer2_size;
answer = newa(uint8_t, answer_size);
memcpy(answer, answer1, answer1_size);
memcpy(answer + answer1_size, answer2, answer2_size);
assert_se(write(fd, answer, answer_size) == (ssize_t)answer_size);
}
static void server_handle(int fd) {
receive_and_check_question(fd, QUESTION_A, sizeof(QUESTION_A));
send_answer(fd, ANSWER_A, sizeof(ANSWER_A));
receive_and_check_question(fd, QUESTION_AAAA, sizeof(QUESTION_AAAA));
send_answer(fd, ANSWER_AAAA, sizeof(ANSWER_AAAA));
receive_and_check_question(fd, QUESTION_A, sizeof(QUESTION_A));
receive_and_check_question(fd, QUESTION_AAAA, sizeof(QUESTION_AAAA));
send_answers_together(fd, ANSWER_A, sizeof(ANSWER_A),
ANSWER_AAAA, sizeof(ANSWER_AAAA));
}
static void *tcp_dns_server(void *p) {
_cleanup_close_ int bindfd = -1, acceptfd = -1;
assert_se((bindfd = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 0)) >= 0);
assert_se(setsockopt(bindfd, SOL_SOCKET, SO_REUSEADDR, &(int){1}, sizeof(int)) >= 0);
assert_se(bind(bindfd, &SERVER_ADDRESS, sizeof(SERVER_ADDRESS)) >= 0);
assert_se(listen(bindfd, 1) >= 0);
assert_se((acceptfd = accept(bindfd, NULL, NULL)) >= 0);
server_handle(acceptfd);
return NULL;
}
#if ENABLE_DNS_OVER_TLS
/*
* Spawns a DNS TLS server using the command line "openssl s_server" tool.
*/
static void *tls_dns_server(void *p) {
pid_t openssl_pid;
int r;
_cleanup_close_ int fd_server = -1, fd_tls = -1;
_cleanup_free_ char *cert_path = NULL, *key_path = NULL;
_cleanup_free_ char *ip_str = NULL, *bind_str = NULL;
assert_se(get_testdata_dir("test-resolve/selfsigned.cert", &cert_path) >= 0);
assert_se(get_testdata_dir("test-resolve/selfsigned.key", &key_path) >= 0);
assert_se(in_addr_to_string(SERVER_ADDRESS.sin_family,
&(union in_addr_union){.in = SERVER_ADDRESS.sin_addr},
&ip_str) >= 0);
asprintf(&bind_str, "%s:%d", ip_str, be16toh(SERVER_ADDRESS.sin_port));
/* We will hook one of the socketpair ends to OpenSSL's TLS server
* stdin/stdout, so we will be able to read and write plaintext
* from the other end's file descriptor like an usual TCP server */
{
int fd[2];
assert_se(socketpair(AF_UNIX, SOCK_STREAM, 0, fd) >= 0);
fd_server = fd[0];
fd_tls = fd[1];
}
r = safe_fork_full("(test-resolved-stream-tls-openssl)", (int[]) { fd_server, fd_tls }, 2,
FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_LOG|FORK_REOPEN_LOG, &openssl_pid);
assert(r >= 0);
if (r == 0) {
/* Child */
assert_se(dup2(fd_tls, STDIN_FILENO) >= 0);
assert_se(dup2(fd_tls, STDOUT_FILENO) >= 0);
close(TAKE_FD(fd_server));
close(TAKE_FD(fd_tls));
execlp("openssl", "openssl", "s_server", "-accept", bind_str,
"-key", key_path, "-cert", cert_path,
"-quiet", "-naccept", "1", NULL);
log_error("exec failed, is something wrong with the 'openssl' command?");
_exit(EXIT_FAILURE);
} else {
pthread_mutex_t *server_lock = (pthread_mutex_t *)p;
server_handle(fd_server);
/* Once the test is done kill the TLS server to release the port */
assert_se(pthread_mutex_lock(server_lock) == 0);
assert_se(kill(openssl_pid, SIGTERM) >= 0);
assert_se(waitpid(openssl_pid, NULL, 0) >= 0);
assert_se(pthread_mutex_unlock(server_lock) == 0);
}
return NULL;
}
#endif
static const char *TEST_DOMAIN = "example.com";
static const uint64_t EVENT_TIMEOUT_USEC = 5 * 1000 * 1000;
static void send_simple_question(DnsStream *stream, uint16_t type) {
_cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
_cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
_cleanup_(dns_question_unrefp) DnsQuestion *question = NULL;
assert_se(dns_packet_new(&p, DNS_PROTOCOL_DNS, 0, DNS_PACKET_SIZE_MAX) >= 0);
assert_se(question = dns_question_new(1));
assert_se(key = dns_resource_key_new(DNS_CLASS_IN, type, TEST_DOMAIN));
assert_se(dns_question_add(question, key, 0) >= 0);
assert_se(dns_packet_append_question(p, question) >= 0);
DNS_PACKET_HEADER(p)->qdcount = htobe16(dns_question_size(question));
assert_se(dns_stream_write_packet(stream, p) >= 0);
}
static const size_t MAX_RECEIVED_PACKETS = 2;
static DnsPacket *received_packets[2] = {};
static size_t n_received_packets = 0;
static int on_stream_packet(DnsStream *stream) {
assert_se(n_received_packets < MAX_RECEIVED_PACKETS);
assert_se(received_packets[n_received_packets++] = dns_stream_take_read_packet(stream));
return 0;
}
static void test_dns_stream(bool tls) {
Manager manager = {};
_cleanup_(dns_stream_unrefp) DnsStream *stream = NULL;
_cleanup_(sd_event_unrefp) sd_event *event = NULL;
_cleanup_close_ int clientfd = -1;
int r;
void *(*server_entrypoint)(void *);
pthread_t server_thread;
pthread_mutex_t server_lock;
log_info("test-resolved-stream: Started %s test", tls ? "TLS" : "TCP");
#if ENABLE_DNS_OVER_TLS
if (tls) {
/* For TLS mode, use DNS_OVER_TLS_OPPORTUNISTIC instead of
* DNS_OVER_TLS_YES, just to make certificate validation more
* lenient, allowing us to use self-signed certificates.
* We never downgrade, everything we test always goes over TLS */
manager.dns_over_tls_mode = DNS_OVER_TLS_OPPORTUNISTIC;
}
#endif
assert_se(sd_event_new(&event) >= 0);
manager.event = event;
/* Set up a mock DNS (over TCP or TLS) server */
server_entrypoint = tcp_dns_server;
#if ENABLE_DNS_OVER_TLS
if (tls)
server_entrypoint = tls_dns_server;
#endif
assert_se(pthread_mutex_init(&server_lock, NULL) == 0);
assert_se(pthread_mutex_lock(&server_lock) == 0);
assert_se(pthread_create(&server_thread, NULL, server_entrypoint, &server_lock) == 0);
/* Create a socket client and connect to the TCP or TLS server
* The server may not be up immediately, so try to connect a few times before failing */
assert_se((clientfd = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 0)) >= 0);
for (int i = 0; i < 100; i++) {
r = connect(clientfd, &SERVER_ADDRESS, sizeof(SERVER_ADDRESS));
if (r >= 0)
break;
usleep(EVENT_TIMEOUT_USEC / 100);
}
assert_se(r >= 0);
/* systemd-resolved uses (and requires) the socket to be in nonblocking mode */
assert_se(fcntl(clientfd, F_SETFL, O_NONBLOCK) >= 0);
/* Initialize DNS stream */
assert_se(dns_stream_new(&manager, &stream, DNS_STREAM_LOOKUP, DNS_PROTOCOL_DNS,
TAKE_FD(clientfd), NULL, DNS_STREAM_DEFAULT_TIMEOUT_USEC) >= 0);
stream->on_packet = on_stream_packet;
#if ENABLE_DNS_OVER_TLS
if (tls) {
DnsServer server = {
.manager = &manager,
.family = SERVER_ADDRESS.sin_family,
.address.in = SERVER_ADDRESS.sin_addr
};
assert_se(dnstls_manager_init(&manager) >= 0);
assert_se(dnstls_stream_connect_tls(stream, &server) >= 0);
}
#endif
/* Test: Question of type A and associated answer */
log_info("test-resolved-stream: A record");
send_simple_question(stream, DNS_TYPE_A);
while (n_received_packets != 1)
assert_se(sd_event_run(event, EVENT_TIMEOUT_USEC) >= 1);
assert_se(DNS_PACKET_DATA(received_packets[0]));
assert_se(memcmp(DNS_PACKET_DATA(received_packets[0]),
ANSWER_A + 2, sizeof(ANSWER_A) - 2) == 0);
dns_packet_unref(TAKE_PTR(received_packets[0]));
n_received_packets = 0;
/* Test: Question of type AAAA and associated answer */
log_info("test-resolved-stream: AAAA record");
send_simple_question(stream, DNS_TYPE_AAAA);
while (n_received_packets != 1)
assert_se(sd_event_run(event, EVENT_TIMEOUT_USEC) >= 1);
assert_se(DNS_PACKET_DATA(received_packets[0]));
assert_se(memcmp(DNS_PACKET_DATA(received_packets[0]),
ANSWER_AAAA + 2, sizeof(ANSWER_AAAA) - 2) == 0);
dns_packet_unref(TAKE_PTR(received_packets[0]));
n_received_packets = 0;
/* Test: Question of type A and AAAA and associated answers
* Both answers are sent back in a single packet or TLS record
* (tests the fix of PR #22132: "Fix DoT timeout on multiple answer records") */
log_info("test-resolved-stream: A + AAAA record");
send_simple_question(stream, DNS_TYPE_A);
send_simple_question(stream, DNS_TYPE_AAAA);
while (n_received_packets != 2)
assert_se(sd_event_run(event, EVENT_TIMEOUT_USEC) >= 1);
assert_se(DNS_PACKET_DATA(received_packets[0]));
assert_se(DNS_PACKET_DATA(received_packets[1]));
assert_se(memcmp(DNS_PACKET_DATA(received_packets[0]),
ANSWER_A + 2, sizeof(ANSWER_A) - 2) == 0);
assert_se(memcmp(DNS_PACKET_DATA(received_packets[1]),
ANSWER_AAAA + 2, sizeof(ANSWER_AAAA) - 2) == 0);
dns_packet_unref(TAKE_PTR(received_packets[0]));
dns_packet_unref(TAKE_PTR(received_packets[1]));
n_received_packets = 0;
#if ENABLE_DNS_OVER_TLS
if (tls)
dnstls_manager_free(&manager);
#endif
/* Stop the DNS server */
assert_se(pthread_mutex_unlock(&server_lock) == 0);
assert_se(pthread_join(server_thread, NULL) == 0);
assert_se(pthread_mutex_destroy(&server_lock) == 0);
log_info("test-resolved-stream: Finished %s test", tls ? "TLS" : "TCP");
}
int main(int argc, char **argv) {
SERVER_ADDRESS = (struct sockaddr_in) {
.sin_family = AF_INET,
.sin_port = htobe16(12345),
.sin_addr.s_addr = htobe32(INADDR_LOOPBACK)
};
test_setup_logging(LOG_DEBUG);
test_dns_stream(false);
#if ENABLE_DNS_OVER_TLS
if (system("openssl version >/dev/null 2>&1") != 0)
return log_tests_skipped("Skipping TLS test since the 'openssl' command does not seem to be available");
test_dns_stream(true);
#endif
return 0;
}

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@ -0,0 +1,32 @@
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@ -0,0 +1,52 @@
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wUVINpxGc87HxFEWeqSBAoIBAQDv8f5vS2w1yZNnz1cQwCPvUmLEevruCeO0IR71
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ckxa7pygcWluGlUUqQlKglEEzQrA32OXRBa1loy2bzeU+px5AoIBAQDCD2HfzCzE
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yY2Bg8KrxyV6xP/yR2l0dM4tdjhZRJtCHIua2/K9w8aC713ak1ZbjVQtQPdX0tNy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-----END PRIVATE KEY-----