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openssl/test/dtlstest.c
Matt Caswell 80c455d5ae Make sure we trigger retransmits in DTLS testing 
During a DTLS handshake we may need to periodically handle timeouts in the
DTLS timer to ensure retransmits due to lost packets are performed. However,
one peer will always complete a handshake before the other. The DTLS timer
stops once the handshake has finished so any handshake messages lost after
that point will not automatically get retransmitted simply by calling
DTLSv1_handle_timeout(). However attempting an SSL_read implies a
DTLSv1_handle_timeout() and additionally will process records received from
the peer. If those records are themselves retransmits then we know that the
peer has not completed its handshake yet and a retransmit of our final
flight automatically occurs.

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/8047)
2019-01-24 13:39:38 +00:00

349 lines
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C
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/*
* Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <string.h>
#include <openssl/bio.h>
#include <openssl/crypto.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include "ssltestlib.h"
#include "testutil.h"
static char *cert = NULL;
static char *privkey = NULL;
static unsigned int timer_cb_count;
#define NUM_TESTS 2
#define DUMMY_CERT_STATUS_LEN 12
static unsigned char certstatus[] = {
SSL3_RT_HANDSHAKE, /* Content type */
0xfe, 0xfd, /* Record version */
0, 1, /* Epoch */
0, 0, 0, 0, 0, 0x0f, /* Record sequence number */
0, DTLS1_HM_HEADER_LENGTH + DUMMY_CERT_STATUS_LEN - 2,
SSL3_MT_CERTIFICATE_STATUS, /* Cert Status handshake message type */
0, 0, DUMMY_CERT_STATUS_LEN, /* Message len */
0, 5, /* Message sequence */
0, 0, 0, /* Fragment offset */
0, 0, DUMMY_CERT_STATUS_LEN - 2, /* Fragment len */
0x80, 0x80, 0x80, 0x80, 0x80,
0x80, 0x80, 0x80, 0x80, 0x80 /* Dummy data */
};
#define RECORD_SEQUENCE 10
static unsigned int timer_cb(SSL *s, unsigned int timer_us)
{
++timer_cb_count;
if (timer_us == 0)
return 50000;
else
return 2 * timer_us;
}
static int test_dtls_unprocessed(int testidx)
{
SSL_CTX *sctx = NULL, *cctx = NULL;
SSL *serverssl1 = NULL, *clientssl1 = NULL;
BIO *c_to_s_fbio, *c_to_s_mempacket;
int testresult = 0;
timer_cb_count = 0;
if (!TEST_true(create_ssl_ctx_pair(DTLS_server_method(),
DTLS_client_method(),
DTLS1_VERSION, 0,
&sctx, &cctx, cert, privkey)))
return 0;
if (!TEST_true(SSL_CTX_set_cipher_list(cctx, "AES128-SHA")))
goto end;
c_to_s_fbio = BIO_new(bio_f_tls_dump_filter());
if (!TEST_ptr(c_to_s_fbio))
goto end;
/* BIO is freed by create_ssl_connection on error */
if (!TEST_true(create_ssl_objects(sctx, cctx, &serverssl1, &clientssl1,
NULL, c_to_s_fbio)))
goto end;
DTLS_set_timer_cb(clientssl1, timer_cb);
if (testidx == 1)
certstatus[RECORD_SEQUENCE] = 0xff;
/*
* Inject a dummy record from the next epoch. In test 0, this should never
* get used because the message sequence number is too big. In test 1 we set
* the record sequence number to be way off in the future.
*/
c_to_s_mempacket = SSL_get_wbio(clientssl1);
c_to_s_mempacket = BIO_next(c_to_s_mempacket);
mempacket_test_inject(c_to_s_mempacket, (char *)certstatus,
sizeof(certstatus), 1, INJECT_PACKET_IGNORE_REC_SEQ);
/*
* Create the connection. We use "create_bare_ssl_connection" here so that
* we can force the connection to not do "SSL_read" once partly conencted.
* We don't want to accidentally read the dummy records we injected because
* they will fail to decrypt.
*/
if (!TEST_true(create_bare_ssl_connection(serverssl1, clientssl1,
SSL_ERROR_NONE, 0)))
goto end;
if (timer_cb_count == 0) {
printf("timer_callback was not called.\n");
goto end;
}
testresult = 1;
end:
SSL_free(serverssl1);
SSL_free(clientssl1);
SSL_CTX_free(sctx);
SSL_CTX_free(cctx);
return testresult;
}
#define CLI_TO_SRV_EPOCH_0_RECS 3
#define CLI_TO_SRV_EPOCH_1_RECS 1
#if !defined(OPENSSL_NO_EC) || !defined(OPENSSL_NO_DH)
# define SRV_TO_CLI_EPOCH_0_RECS 12
#else
/*
* In this case we have no ServerKeyExchange message, because we don't have
* ECDHE or DHE. When it is present it gets fragmented into 3 records in this
* test.
*/
# define SRV_TO_CLI_EPOCH_0_RECS 9
#endif
#define SRV_TO_CLI_EPOCH_1_RECS 1
#define TOTAL_FULL_HAND_RECORDS \
(CLI_TO_SRV_EPOCH_0_RECS + CLI_TO_SRV_EPOCH_1_RECS + \
SRV_TO_CLI_EPOCH_0_RECS + SRV_TO_CLI_EPOCH_1_RECS)
#define CLI_TO_SRV_RESUME_EPOCH_0_RECS 3
#define CLI_TO_SRV_RESUME_EPOCH_1_RECS 1
#define SRV_TO_CLI_RESUME_EPOCH_0_RECS 2
#define SRV_TO_CLI_RESUME_EPOCH_1_RECS 1
#define TOTAL_RESUME_HAND_RECORDS \
(CLI_TO_SRV_RESUME_EPOCH_0_RECS + CLI_TO_SRV_RESUME_EPOCH_1_RECS + \
SRV_TO_CLI_RESUME_EPOCH_0_RECS + SRV_TO_CLI_RESUME_EPOCH_1_RECS)
#define TOTAL_RECORDS (TOTAL_FULL_HAND_RECORDS + TOTAL_RESUME_HAND_RECORDS)
static int test_dtls_drop_records(int idx)
{
SSL_CTX *sctx = NULL, *cctx = NULL;
SSL *serverssl = NULL, *clientssl = NULL;
BIO *c_to_s_fbio, *mempackbio;
int testresult = 0;
int epoch = 0;
SSL_SESSION *sess = NULL;
int cli_to_srv_epoch0, cli_to_srv_epoch1, srv_to_cli_epoch0;
if (!TEST_true(create_ssl_ctx_pair(DTLS_server_method(),
DTLS_client_method(),
DTLS1_VERSION, 0,
&sctx, &cctx, cert, privkey)))
return 0;
if (idx >= TOTAL_FULL_HAND_RECORDS) {
/* We're going to do a resumption handshake. Get a session first. */
if (!TEST_true(create_ssl_objects(sctx, cctx, &serverssl, &clientssl,
NULL, NULL))
|| !TEST_true(create_ssl_connection(serverssl, clientssl,
SSL_ERROR_NONE))
|| !TEST_ptr(sess = SSL_get1_session(clientssl)))
goto end;
SSL_shutdown(clientssl);
SSL_shutdown(serverssl);
SSL_free(serverssl);
SSL_free(clientssl);
serverssl = clientssl = NULL;
cli_to_srv_epoch0 = CLI_TO_SRV_RESUME_EPOCH_0_RECS;
cli_to_srv_epoch1 = CLI_TO_SRV_RESUME_EPOCH_1_RECS;
srv_to_cli_epoch0 = SRV_TO_CLI_RESUME_EPOCH_0_RECS;
idx -= TOTAL_FULL_HAND_RECORDS;
} else {
cli_to_srv_epoch0 = CLI_TO_SRV_EPOCH_0_RECS;
cli_to_srv_epoch1 = CLI_TO_SRV_EPOCH_1_RECS;
srv_to_cli_epoch0 = SRV_TO_CLI_EPOCH_0_RECS;
}
c_to_s_fbio = BIO_new(bio_f_tls_dump_filter());
if (!TEST_ptr(c_to_s_fbio))
goto end;
/* BIO is freed by create_ssl_connection on error */
if (!TEST_true(create_ssl_objects(sctx, cctx, &serverssl, &clientssl,
NULL, c_to_s_fbio)))
goto end;
if (sess != NULL) {
if (!TEST_true(SSL_set_session(clientssl, sess)))
goto end;
}
DTLS_set_timer_cb(clientssl, timer_cb);
DTLS_set_timer_cb(serverssl, timer_cb);
/* Work out which record to drop based on the test number */
if (idx >= cli_to_srv_epoch0 + cli_to_srv_epoch1) {
mempackbio = SSL_get_wbio(serverssl);
idx -= cli_to_srv_epoch0 + cli_to_srv_epoch1;
if (idx >= srv_to_cli_epoch0) {
epoch = 1;
idx -= srv_to_cli_epoch0;
}
} else {
mempackbio = SSL_get_wbio(clientssl);
if (idx >= cli_to_srv_epoch0) {
epoch = 1;
idx -= cli_to_srv_epoch0;
}
mempackbio = BIO_next(mempackbio);
}
BIO_ctrl(mempackbio, MEMPACKET_CTRL_SET_DROP_EPOCH, epoch, NULL);
BIO_ctrl(mempackbio, MEMPACKET_CTRL_SET_DROP_REC, idx, NULL);
if (!TEST_true(create_ssl_connection(serverssl, clientssl, SSL_ERROR_NONE)))
goto end;
if (sess != NULL && !TEST_true(SSL_session_reused(clientssl)))
goto end;
/* If the test did what we planned then it should have dropped a record */
if (!TEST_int_eq((int)BIO_ctrl(mempackbio, MEMPACKET_CTRL_GET_DROP_REC, 0,
NULL), -1))
goto end;
testresult = 1;
end:
SSL_SESSION_free(sess);
SSL_free(serverssl);
SSL_free(clientssl);
SSL_CTX_free(sctx);
SSL_CTX_free(cctx);
return testresult;
}
static const char dummy_cookie[] = "0123456";
static int generate_cookie_cb(SSL *ssl, unsigned char *cookie,
unsigned int *cookie_len)
{
memcpy(cookie, dummy_cookie, sizeof(dummy_cookie));
*cookie_len = sizeof(dummy_cookie);
return 1;
}
static int verify_cookie_cb(SSL *ssl, const unsigned char *cookie,
unsigned int cookie_len)
{
return TEST_mem_eq(cookie, cookie_len, dummy_cookie, sizeof(dummy_cookie));
}
static int test_cookie(void)
{
SSL_CTX *sctx = NULL, *cctx = NULL;
SSL *serverssl = NULL, *clientssl = NULL;
int testresult = 0;
if (!TEST_true(create_ssl_ctx_pair(DTLS_server_method(),
DTLS_client_method(),
DTLS1_VERSION, 0,
&sctx, &cctx, cert, privkey)))
return 0;
SSL_CTX_set_options(sctx, SSL_OP_COOKIE_EXCHANGE);
SSL_CTX_set_cookie_generate_cb(sctx, generate_cookie_cb);
SSL_CTX_set_cookie_verify_cb(sctx, verify_cookie_cb);
if (!TEST_true(create_ssl_objects(sctx, cctx, &serverssl, &clientssl,
NULL, NULL))
|| !TEST_true(create_ssl_connection(serverssl, clientssl,
SSL_ERROR_NONE)))
goto end;
testresult = 1;
end:
SSL_free(serverssl);
SSL_free(clientssl);
SSL_CTX_free(sctx);
SSL_CTX_free(cctx);
return testresult;
}
static int test_dtls_duplicate_records(void)
{
SSL_CTX *sctx = NULL, *cctx = NULL;
SSL *serverssl = NULL, *clientssl = NULL;
int testresult = 0;
if (!TEST_true(create_ssl_ctx_pair(DTLS_server_method(),
DTLS_client_method(),
DTLS1_VERSION, 0,
&sctx, &cctx, cert, privkey)))
return 0;
if (!TEST_true(create_ssl_objects(sctx, cctx, &serverssl, &clientssl,
NULL, NULL)))
goto end;
DTLS_set_timer_cb(clientssl, timer_cb);
DTLS_set_timer_cb(serverssl, timer_cb);
BIO_ctrl(SSL_get_wbio(clientssl), MEMPACKET_CTRL_SET_DUPLICATE_REC, 1, NULL);
BIO_ctrl(SSL_get_wbio(serverssl), MEMPACKET_CTRL_SET_DUPLICATE_REC, 1, NULL);
if (!TEST_true(create_ssl_connection(serverssl, clientssl, SSL_ERROR_NONE)))
goto end;
testresult = 1;
end:
SSL_free(serverssl);
SSL_free(clientssl);
SSL_CTX_free(sctx);
SSL_CTX_free(cctx);
return testresult;
}
int setup_tests(void)
{
if (!TEST_ptr(cert = test_get_argument(0))
|| !TEST_ptr(privkey = test_get_argument(1)))
return 0;
ADD_ALL_TESTS(test_dtls_unprocessed, NUM_TESTS);
ADD_ALL_TESTS(test_dtls_drop_records, TOTAL_RECORDS);
ADD_TEST(test_cookie);
ADD_TEST(test_dtls_duplicate_records);
return 1;
}
void cleanup_tests(void)
{
bio_f_tls_dump_filter_free();
bio_s_mempacket_test_free();
}
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