2 * Copyright 2016-2022 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
13 #include <openssl/dtls1.h>
14 #include <openssl/ssl.h>
15 #include <openssl/err.h>
17 #include "helpers/ssltestlib.h"
20 /* for SSL_READ_ETM() */
21 #include "../ssl/ssl_local.h"
25 static unsigned int clnt_psk_callback(SSL *ssl, const char *hint,
26 char *ident, unsigned int max_ident_len,
28 unsigned int max_psk_len)
30 BIO_snprintf(ident, max_ident_len, "psk");
34 memset(psk, 0x5a, max_psk_len);
39 static unsigned int srvr_psk_callback(SSL *ssl, const char *identity,
41 unsigned int max_psk_len)
45 memset(psk, 0x5a, max_psk_len);
49 static int mtu_test(SSL_CTX *ctx, const char *cs, int no_etm)
51 SSL *srvr_ssl = NULL, *clnt_ssl = NULL;
56 unsigned char buf[600];
58 SSL_CONNECTION *clnt_sc;
60 memset(buf, 0x5a, sizeof(buf));
62 if (!TEST_true(create_ssl_objects(ctx, ctx, &srvr_ssl, &clnt_ssl,
67 SSL_set_options(srvr_ssl, SSL_OP_NO_ENCRYPT_THEN_MAC);
69 if (!TEST_true(SSL_set_cipher_list(srvr_ssl, cs))
70 || !TEST_true(SSL_set_cipher_list(clnt_ssl, cs))
71 || !TEST_ptr(sc_bio = SSL_get_rbio(srvr_ssl))
72 || !TEST_true(create_ssl_connection(clnt_ssl, srvr_ssl,
77 TEST_info("Channel established");
79 /* For record MTU values between 500 and 539, call DTLS_get_data_mtu()
80 * to query the payload MTU which will fit. */
81 for (i = 0; i < 30; i++) {
82 SSL_set_mtu(clnt_ssl, 500 + i);
83 mtus[i] = DTLS_get_data_mtu(clnt_ssl);
85 TEST_info("%s%s MTU for record mtu %d = %lu",
86 cs, no_etm ? "-noEtM" : "",
87 500 + i, (unsigned long)mtus[i]);
88 if (!TEST_size_t_ne(mtus[i], 0)) {
89 TEST_info("Cipher %s MTU %d", cs, 500 + i);
94 /* Now get out of the way */
95 SSL_set_mtu(clnt_ssl, 1000);
98 * Now for all values in the range of payload MTUs, send a payload of
99 * that size and see what actual record size we end up with.
101 for (s = mtus[0]; s <= mtus[29]; s++) {
104 if (!TEST_int_eq(SSL_write(clnt_ssl, buf, s), (int)s))
106 reclen = BIO_read(sc_bio, buf, sizeof(buf));
108 TEST_info("record %zu for payload %zu", reclen, s);
110 for (i = 0; i < 30; i++) {
111 /* DTLS_get_data_mtu() with record MTU 500+i returned mtus[i] ... */
113 if (!TEST_false(s <= mtus[i] && reclen > (size_t)(500 + i))) {
115 * We sent a packet smaller than or equal to mtus[j] and
116 * that made a record *larger* than the record MTU 500+j!
118 TEST_error("%s: s=%lu, mtus[i]=%lu, reclen=%lu, i=%d",
119 cs, (unsigned long)s, (unsigned long)mtus[i],
120 (unsigned long)reclen, 500 + i);
123 if (!TEST_false(s > mtus[i] && reclen <= (size_t)(500 + i))) {
125 * We sent a *larger* packet than mtus[i] and that *still*
126 * fits within the record MTU 500+i, so DTLS_get_data_mtu()
127 * was overly pessimistic.
129 TEST_error("%s: s=%lu, mtus[i]=%lu, reclen=%lu, i=%d",
130 cs, (unsigned long)s, (unsigned long)mtus[i],
131 (unsigned long)reclen, 500 + i);
136 if (!TEST_ptr(clnt_sc = SSL_CONNECTION_FROM_SSL_ONLY(clnt_ssl)))
139 if (SSL_READ_ETM(clnt_sc))
147 static int run_mtu_tests(void)
150 STACK_OF(SSL_CIPHER) *ciphers;
153 if (!TEST_ptr(ctx = SSL_CTX_new(DTLS_method())))
156 SSL_CTX_set_psk_server_callback(ctx, srvr_psk_callback);
157 SSL_CTX_set_psk_client_callback(ctx, clnt_psk_callback);
158 SSL_CTX_set_security_level(ctx, 0);
161 * We only care about iterating over each enc/mac; we don't want to
162 * repeat the test for each auth/kx variant. So keep life simple and
163 * only do (non-DH) PSK.
165 if (!TEST_true(SSL_CTX_set_cipher_list(ctx, "PSK")))
168 ciphers = SSL_CTX_get_ciphers(ctx);
169 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
170 const SSL_CIPHER *cipher = sk_SSL_CIPHER_value(ciphers, i);
171 const char *cipher_name = SSL_CIPHER_get_name(cipher);
173 /* As noted above, only one test for each enc/mac variant. */
174 if (!HAS_PREFIX(cipher_name, "PSK-"))
177 if (!TEST_int_gt(ret = mtu_test(ctx, cipher_name, 0), 0))
179 TEST_info("%s OK", cipher_name);
183 /* mtu_test() returns 2 if it used Encrypt-then-MAC */
184 if (!TEST_int_gt(ret = mtu_test(ctx, cipher_name, 1), 0))
186 TEST_info("%s without EtM OK", cipher_name);
194 static int test_server_mtu_larger_than_max_fragment_length(void)
197 SSL *srvr_ssl = NULL, *clnt_ssl = NULL;
200 if (!TEST_ptr(ctx = SSL_CTX_new(DTLS_method())))
203 SSL_CTX_set_psk_server_callback(ctx, srvr_psk_callback);
204 SSL_CTX_set_psk_client_callback(ctx, clnt_psk_callback);
206 #ifndef OPENSSL_NO_DH
207 if (!TEST_true(SSL_CTX_set_dh_auto(ctx, 1)))
211 if (!TEST_true(create_ssl_objects(ctx, ctx, &srvr_ssl, &clnt_ssl,
215 SSL_set_options(srvr_ssl, SSL_OP_NO_QUERY_MTU);
216 if (!TEST_true(DTLS_set_link_mtu(srvr_ssl, 1500)))
219 SSL_set_tlsext_max_fragment_length(clnt_ssl,
220 TLSEXT_max_fragment_length_512);
222 if (!TEST_true(create_ssl_connection(srvr_ssl, clnt_ssl,
235 int setup_tests(void)
237 ADD_TEST(run_mtu_tests);
238 ADD_TEST(test_server_mtu_larger_than_max_fragment_length);
242 void cleanup_tests(void)
244 bio_s_mempacket_test_free();