1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
/*
* 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 <stdio.h>
#include <string.h>
#include <openssl/dtls1.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include "ssltestlib.h"
#include "testutil.h"
/* for SSL_READ_ETM() */
#include "../ssl/ssl_local.h"
static int debug = 0;
static unsigned int clnt_psk_callback(SSL *ssl, const char *hint,
char *ident, unsigned int max_ident_len,
unsigned char *psk,
unsigned int max_psk_len)
{
BIO_snprintf(ident, max_ident_len, "psk");
if (max_psk_len > 20)
max_psk_len = 20;
memset(psk, 0x5a, max_psk_len);
return max_psk_len;
}
static unsigned int srvr_psk_callback(SSL *ssl, const char *identity,
unsigned char *psk,
unsigned int max_psk_len)
{
if (max_psk_len > 20)
max_psk_len = 20;
memset(psk, 0x5a, max_psk_len);
return max_psk_len;
}
static int mtu_test(SSL_CTX *ctx, const char *cs, int no_etm)
{
SSL *srvr_ssl = NULL, *clnt_ssl = NULL;
BIO *sc_bio = NULL;
int i;
size_t s;
size_t mtus[30];
unsigned char buf[600];
int rv = 0;
memset(buf, 0x5a, sizeof(buf));
if (!TEST_true(create_ssl_objects(ctx, ctx, &srvr_ssl, &clnt_ssl,
NULL, NULL)))
goto end;
if (no_etm)
SSL_set_options(srvr_ssl, SSL_OP_NO_ENCRYPT_THEN_MAC);
if (!TEST_true(SSL_set_cipher_list(srvr_ssl, cs))
|| !TEST_true(SSL_set_cipher_list(clnt_ssl, cs))
|| !TEST_ptr(sc_bio = SSL_get_rbio(srvr_ssl))
|| !TEST_true(create_ssl_connection(clnt_ssl, srvr_ssl,
SSL_ERROR_NONE)))
goto end;
if (debug)
TEST_info("Channel established");
/* For record MTU values between 500 and 539, call DTLS_get_data_mtu()
* to query the payload MTU which will fit. */
for (i = 0; i < 30; i++) {
SSL_set_mtu(clnt_ssl, 500 + i);
mtus[i] = DTLS_get_data_mtu(clnt_ssl);
if (debug)
TEST_info("%s%s MTU for record mtu %d = %lu",
cs, no_etm ? "-noEtM" : "",
500 + i, (unsigned long)mtus[i]);
if (!TEST_size_t_ne(mtus[i], 0)) {
TEST_info("Cipher %s MTU %d", cs, 500 + i);
goto end;
}
}
/* Now get out of the way */
SSL_set_mtu(clnt_ssl, 1000);
/*
* Now for all values in the range of payload MTUs, send a payload of
* that size and see what actual record size we end up with.
*/
for (s = mtus[0]; s <= mtus[29]; s++) {
size_t reclen;
if (!TEST_int_eq(SSL_write(clnt_ssl, buf, s), (int)s))
goto end;
reclen = BIO_read(sc_bio, buf, sizeof(buf));
if (debug)
TEST_info("record %zu for payload %zu", reclen, s);
for (i = 0; i < 30; i++) {
/* DTLS_get_data_mtu() with record MTU 500+i returned mtus[i] ... */
if (!TEST_false(s <= mtus[i] && reclen > (size_t)(500 + i))) {
/*
* We sent a packet smaller than or equal to mtus[j] and
* that made a record *larger* than the record MTU 500+j!
*/
TEST_error("%s: s=%lu, mtus[i]=%lu, reclen=%lu, i=%d",
cs, (unsigned long)s, (unsigned long)mtus[i],
(unsigned long)reclen, 500 + i);
goto end;
}
if (!TEST_false(s > mtus[i] && reclen <= (size_t)(500 + i))) {
/*
* We sent a *larger* packet than mtus[i] and that *still*
* fits within the record MTU 500+i, so DTLS_get_data_mtu()
* was overly pessimistic.
*/
TEST_error("%s: s=%lu, mtus[i]=%lu, reclen=%lu, i=%d",
cs, (unsigned long)s, (unsigned long)mtus[i],
(unsigned long)reclen, 500 + i);
goto end;
}
}
}
rv = 1;
if (SSL_READ_ETM(clnt_ssl))
rv = 2;
end:
SSL_free(clnt_ssl);
SSL_free(srvr_ssl);
return rv;
}
static int run_mtu_tests(void)
{
SSL_CTX *ctx = NULL;
STACK_OF(SSL_CIPHER) *ciphers;
int i, ret = 0;
if (!TEST_ptr(ctx = SSL_CTX_new(DTLS_method())))
goto end;
SSL_CTX_set_psk_server_callback(ctx, srvr_psk_callback);
SSL_CTX_set_psk_client_callback(ctx, clnt_psk_callback);
SSL_CTX_set_security_level(ctx, 0);
/*
* We only care about iterating over each enc/mac; we don't want to
* repeat the test for each auth/kx variant. So keep life simple and
* only do (non-DH) PSK.
*/
if (!TEST_true(SSL_CTX_set_cipher_list(ctx, "PSK")))
goto end;
ciphers = SSL_CTX_get_ciphers(ctx);
for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
const SSL_CIPHER *cipher = sk_SSL_CIPHER_value(ciphers, i);
const char *cipher_name = SSL_CIPHER_get_name(cipher);
/* As noted above, only one test for each enc/mac variant. */
if (strncmp(cipher_name, "PSK-", 4) != 0)
continue;
if (!TEST_int_gt(ret = mtu_test(ctx, cipher_name, 0), 0))
break;
TEST_info("%s OK", cipher_name);
if (ret == 1)
continue;
/* mtu_test() returns 2 if it used Encrypt-then-MAC */
if (!TEST_int_gt(ret = mtu_test(ctx, cipher_name, 1), 0))
break;
TEST_info("%s without EtM OK", cipher_name);
}
end:
SSL_CTX_free(ctx);
bio_s_mempacket_test_free();
return ret;
}
int setup_tests(void)
{
ADD_TEST(run_mtu_tests);
return 1;
}
|
