test/clienthellotest.c

   1 /*
   2  * Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (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
   8  */
   9
  10 #include <string.h>
  11
  12 #include <openssl/opensslconf.h>
  13 #include <openssl/bio.h>
  14 #include <openssl/crypto.h>
  15 #include <openssl/evp.h>
  16 #include <openssl/ssl.h>
  17 #include <openssl/err.h>
  18 #include <time.h>
  19
  20 #include "../ssl/packet_locl.h"
  21
  22 #include "testutil.h"
  23
  24 #define CLIENT_VERSION_LEN      2
  25
  26 #define TOTAL_NUM_TESTS                         4
  27
  28 /*
  29  * Test that explicitly setting ticket data results in it appearing in the
  30  * ClientHello for a negotiated SSL/TLS version
  31  */
  32 #define TEST_SET_SESSION_TICK_DATA_VER_NEG      0
  33 /* Enable padding and make sure ClientHello is long enough to require it */
  34 #define TEST_ADD_PADDING                        1
  35 /* Enable padding and make sure ClientHello is short enough to not need it */
  36 #define TEST_PADDING_NOT_NEEDED                 2
  37 /*
  38  * Enable padding and add a PSK to the ClientHello (this will also ensure the
  39  * ClientHello is long enough to need padding)
  40  */
  41 #define TEST_ADD_PADDING_AND_PSK                3
  42
  43 #define F5_WORKAROUND_MIN_MSG_LEN   0x7f
  44 #define F5_WORKAROUND_MAX_MSG_LEN   0x200
  45
  46 static const char *sessionfile = NULL;
  47 /* Dummy ALPN protocols used to pad out the size of the ClientHello */
  48 static const char alpn_prots[] =
  49     "0123456789012345678901234567890123456789012345678901234567890123456789"
  50     "0123456789012345678901234567890123456789012345678901234567890123456789"
  51     "01234567890123456789";
  52
  53 static int test_client_hello(int currtest)
  54 {
  55     SSL_CTX *ctx;
  56     SSL *con = NULL;
  57     BIO *rbio;
  58     BIO *wbio;
  59     long len;
  60     unsigned char *data;
  61     PACKET pkt = {0}, pkt2 = {0}, pkt3 = {0};
  62     char *dummytick = "Hello World!";
  63     unsigned int type = 0;
  64     int testresult = 0;
  65     size_t msglen;
  66     BIO *sessbio = NULL;
  67     SSL_SESSION *sess = NULL;
  68
  69 #ifdef OPENSSL_NO_TLS1_3
  70     if (currtest == TEST_ADD_PADDING_AND_PSK)
  71         return 1;
  72 #endif
  73
  74     /*
  75      * For each test set up an SSL_CTX and SSL and see what ClientHello gets
  76      * produced when we try to connect
  77      */
  78     ctx = SSL_CTX_new(TLS_method());
  79     if (!TEST_ptr(ctx))
  80         goto end;
  81
  82     switch(currtest) {
  83     case TEST_SET_SESSION_TICK_DATA_VER_NEG:
  84 #if !defined(OPENSSL_NO_TLS1_3) && defined(OPENSSL_NO_TLS1_2)
  85         /* TLSv1.3 is enabled and TLSv1.2 is disabled so can't do this test */
  86         return 1;
  87 #else
  88         /* Testing for session tickets <= TLS1.2; not relevant for 1.3 */
  89         if (!TEST_true(SSL_CTX_set_max_proto_version(ctx, TLS1_2_VERSION)))
  90             goto end;
  91 #endif
  92         break;
  93
  94     case TEST_ADD_PADDING_AND_PSK:
  95         /*
  96          * In this case we're doing TLSv1.3 and we're sending a PSK so the
  97          * ClientHello is already going to be quite long. To avoid getting one
  98          * that is too long for this test we use a restricted ciphersuite list
  99          */
 100         if (!TEST_true(SSL_CTX_set_cipher_list(ctx, "")))
 101             goto end;
 102          /* Fall through */
 103     case TEST_ADD_PADDING:
 104     case TEST_PADDING_NOT_NEEDED:
 105         SSL_CTX_set_options(ctx, SSL_OP_TLSEXT_PADDING);
 106         /* Make sure we get a consistent size across TLS versions */
 107         SSL_CTX_clear_options(ctx, SSL_OP_ENABLE_MIDDLEBOX_COMPAT);
 108         /*
 109          * Add some dummy ALPN protocols so that the ClientHello is at least
 110          * F5_WORKAROUND_MIN_MSG_LEN bytes long - meaning padding will be
 111          * needed.
 112          */
 113         if (currtest == TEST_ADD_PADDING) {
 114              if (!TEST_false(SSL_CTX_set_alpn_protos(ctx,
 115                                     (unsigned char *)alpn_prots,
 116                                     sizeof(alpn_prots) - 1)))
 117                 goto end;
 118         /*
 119          * Otherwise we need to make sure we have a small enough message to
 120          * not need padding.
 121          */
 122         } else if (!TEST_true(SSL_CTX_set_cipher_list(ctx,
 123                               "AES128-SHA:TLS13-AES-128-GCM-SHA256"))) {
 124             goto end;
 125         }
 126         break;
 127
 128     default:
 129         goto end;
 130     }
 131
 132     con = SSL_new(ctx);
 133     if (!TEST_ptr(con))
 134         goto end;
 135
 136     if (currtest == TEST_ADD_PADDING_AND_PSK) {
 137         sessbio = BIO_new_file(sessionfile, "r");
 138         if (!TEST_ptr(sessbio)) {
 139             TEST_info("Unable to open session.pem");
 140             goto end;
 141         }
 142         sess = PEM_read_bio_SSL_SESSION(sessbio, NULL, NULL, NULL);
 143         if (!TEST_ptr(sess)) {
 144             TEST_info("Unable to load SSL_SESSION");
 145             goto end;
 146         }
 147         /*
 148          * We reset the creation time so that we don't discard the session as
 149          * too old.
 150          */
 151         if (!TEST_true(SSL_SESSION_set_time(sess, (long)time(NULL)))
 152                 || !TEST_true(SSL_set_session(con, sess)))
 153             goto end;
 154     }
 155
 156     rbio = BIO_new(BIO_s_mem());
 157     wbio = BIO_new(BIO_s_mem());
 158     if (!TEST_ptr(rbio)|| !TEST_ptr(wbio)) {
 159         BIO_free(rbio);
 160         BIO_free(wbio);
 161         goto end;
 162     }
 163
 164     SSL_set_bio(con, rbio, wbio);
 165     SSL_set_connect_state(con);
 166
 167     if (currtest == TEST_SET_SESSION_TICK_DATA_VER_NEG) {
 168         if (!TEST_true(SSL_set_session_ticket_ext(con, dummytick,
 169                                                   strlen(dummytick))))
 170             goto end;
 171     }
 172
 173     if (!TEST_int_le(SSL_connect(con), 0)) {
 174         /* This shouldn't succeed because we don't have a server! */
 175         goto end;
 176     }
 177
 178     len = BIO_get_mem_data(wbio, (char **)&data);
 179     if (!TEST_true(PACKET_buf_init(&pkt, data, len))
 180                /* Skip the record header */
 181             || !PACKET_forward(&pkt, SSL3_RT_HEADER_LENGTH))
 182         goto end;
 183
 184     msglen = PACKET_remaining(&pkt);
 185
 186     /* Skip the handshake message header */
 187     if (!TEST_true(PACKET_forward(&pkt, SSL3_HM_HEADER_LENGTH))
 188                /* Skip client version and random */
 189             || !TEST_true(PACKET_forward(&pkt, CLIENT_VERSION_LEN
 190                                                + SSL3_RANDOM_SIZE))
 191                /* Skip session id */
 192             || !TEST_true(PACKET_get_length_prefixed_1(&pkt, &pkt2))
 193                /* Skip ciphers */
 194             || !TEST_true(PACKET_get_length_prefixed_2(&pkt, &pkt2))
 195                /* Skip compression */
 196             || !TEST_true(PACKET_get_length_prefixed_1(&pkt, &pkt2))
 197                /* Extensions len */
 198             || !TEST_true(PACKET_as_length_prefixed_2(&pkt, &pkt2)))
 199         goto end;
 200
 201     /* Loop through all extensions */
 202     while (PACKET_remaining(&pkt2)) {
 203
 204         if (!TEST_true(PACKET_get_net_2(&pkt2, &type))
 205                 || !TEST_true(PACKET_get_length_prefixed_2(&pkt2, &pkt3)))
 206             goto end;
 207
 208         if (type == TLSEXT_TYPE_session_ticket) {
 209             if (currtest == TEST_SET_SESSION_TICK_DATA_VER_NEG) {
 210                 if (TEST_true(PACKET_equal(&pkt3, dummytick,
 211                                            strlen(dummytick)))) {
 212                     /* Ticket data is as we expected */
 213                     testresult = 1;
 214                 }
 215                 goto end;
 216             }
 217         }
 218         if (type == TLSEXT_TYPE_padding) {
 219             if (!TEST_false(currtest == TEST_PADDING_NOT_NEEDED))
 220                 goto end;
 221             else if (TEST_true(currtest == TEST_ADD_PADDING
 222                     || currtest == TEST_ADD_PADDING_AND_PSK))
 223                 testresult = TEST_true(msglen == F5_WORKAROUND_MAX_MSG_LEN);
 224         }
 225     }
 226
 227     if (currtest == TEST_PADDING_NOT_NEEDED)
 228         testresult = 1;
 229
 230 end:
 231     SSL_free(con);
 232     SSL_CTX_free(ctx);
 233     SSL_SESSION_free(sess);
 234     BIO_free(sessbio);
 235
 236     return testresult;
 237 }
 238
 239 int setup_tests(void)
 240 {
 241     if (!TEST_ptr(sessionfile = test_get_argument(0)))
 242         return 0;
 243
 244     ADD_ALL_TESTS(test_client_hello, TOTAL_NUM_TESTS);
 245     return 1;
 246 }