2 * Copyright 2016-2018 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 "ssltestlib.h"
20 /* for SSL_READ_ETM() */
21 #include "../ssl/ssl_local.h"
23 DEFINE_STACK_OF(SSL_CIPHER)
27 static unsigned int clnt_psk_callback(SSL *ssl, const char *hint,
28 char *ident, unsigned int max_ident_len,
30 unsigned int max_psk_len)
32 BIO_snprintf(ident, max_ident_len, "psk");
36 memset(psk, 0x5a, max_psk_len);
41 static unsigned int srvr_psk_callback(SSL *ssl, const char *identity,
43 unsigned int max_psk_len)
47 memset(psk, 0x5a, max_psk_len);
51 static int mtu_test(SSL_CTX *ctx, const char *cs, int no_etm)
53 SSL *srvr_ssl = NULL, *clnt_ssl = NULL;
58 unsigned char buf[600];
61 memset(buf, 0x5a, sizeof(buf));
63 if (!TEST_true(create_ssl_objects(ctx, ctx, &srvr_ssl, &clnt_ssl,
68 SSL_set_options(srvr_ssl, SSL_OP_NO_ENCRYPT_THEN_MAC);
70 if (!TEST_true(SSL_set_cipher_list(srvr_ssl, cs))
71 || !TEST_true(SSL_set_cipher_list(clnt_ssl, cs))
72 || !TEST_ptr(sc_bio = SSL_get_rbio(srvr_ssl))
73 || !TEST_true(create_ssl_connection(clnt_ssl, srvr_ssl,
78 TEST_info("Channel established");
80 /* For record MTU values between 500 and 539, call DTLS_get_data_mtu()
81 * to query the payload MTU which will fit. */
82 for (i = 0; i < 30; i++) {
83 SSL_set_mtu(clnt_ssl, 500 + i);
84 mtus[i] = DTLS_get_data_mtu(clnt_ssl);
86 TEST_info("%s%s MTU for record mtu %d = %lu",
87 cs, no_etm ? "-noEtM" : "",
88 500 + i, (unsigned long)mtus[i]);
89 if (!TEST_size_t_ne(mtus[i], 0)) {
90 TEST_info("Cipher %s MTU %d", cs, 500 + i);
95 /* Now get out of the way */
96 SSL_set_mtu(clnt_ssl, 1000);
99 * Now for all values in the range of payload MTUs, send a payload of
100 * that size and see what actual record size we end up with.
102 for (s = mtus[0]; s <= mtus[29]; s++) {
105 if (!TEST_int_eq(SSL_write(clnt_ssl, buf, s), (int)s))
107 reclen = BIO_read(sc_bio, buf, sizeof(buf));
109 TEST_info("record %zu for payload %zu", reclen, s);
111 for (i = 0; i < 30; i++) {
112 /* DTLS_get_data_mtu() with record MTU 500+i returned mtus[i] ... */
114 if (!TEST_false(s <= mtus[i] && reclen > (size_t)(500 + i))) {
116 * We sent a packet smaller than or equal to mtus[j] and
117 * that made a record *larger* than the record MTU 500+j!
119 TEST_error("%s: s=%lu, mtus[i]=%lu, reclen=%lu, i=%d",
120 cs, (unsigned long)s, (unsigned long)mtus[i],
121 (unsigned long)reclen, 500 + i);
124 if (!TEST_false(s > mtus[i] && reclen <= (size_t)(500 + i))) {
126 * We sent a *larger* packet than mtus[i] and that *still*
127 * fits within the record MTU 500+i, so DTLS_get_data_mtu()
128 * was overly pessimistic.
130 TEST_error("%s: s=%lu, mtus[i]=%lu, reclen=%lu, i=%d",
131 cs, (unsigned long)s, (unsigned long)mtus[i],
132 (unsigned long)reclen, 500 + i);
138 if (SSL_READ_ETM(clnt_ssl))
146 static int run_mtu_tests(void)
149 STACK_OF(SSL_CIPHER) *ciphers;
152 if (!TEST_ptr(ctx = SSL_CTX_new(DTLS_method())))
155 SSL_CTX_set_psk_server_callback(ctx, srvr_psk_callback);
156 SSL_CTX_set_psk_client_callback(ctx, clnt_psk_callback);
157 SSL_CTX_set_security_level(ctx, 0);
160 * We only care about iterating over each enc/mac; we don't want to
161 * repeat the test for each auth/kx variant. So keep life simple and
162 * only do (non-DH) PSK.
164 if (!TEST_true(SSL_CTX_set_cipher_list(ctx, "PSK")))
167 ciphers = SSL_CTX_get_ciphers(ctx);
168 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
169 const SSL_CIPHER *cipher = sk_SSL_CIPHER_value(ciphers, i);
170 const char *cipher_name = SSL_CIPHER_get_name(cipher);
172 /* As noted above, only one test for each enc/mac variant. */
173 if (strncmp(cipher_name, "PSK-", 4) != 0)
176 if (!TEST_int_gt(ret = mtu_test(ctx, cipher_name, 0), 0))
178 TEST_info("%s OK", cipher_name);
182 /* mtu_test() returns 2 if it used Encrypt-then-MAC */
183 if (!TEST_int_gt(ret = mtu_test(ctx, cipher_name, 1), 0))
185 TEST_info("%s without EtM OK", cipher_name);
190 bio_s_mempacket_test_free();
194 int setup_tests(void)
196 ADD_TEST(run_mtu_tests);