test/clienthellotest.c

   1 /*
   2  * Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   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
   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     if (!TEST_true(SSL_CTX_set_max_proto_version(ctx, TLS_MAX_VERSION)))
  82         goto end;
  83
  84     switch(currtest) {
  85     case TEST_SET_SESSION_TICK_DATA_VER_NEG:
  86 #if !defined(OPENSSL_NO_TLS1_3) && defined(OPENSSL_NO_TLS1_2)
  87         /* TLSv1.3 is enabled and TLSv1.2 is disabled so can't do this test */
  88         return 1;
  89 #else
  90         /* Testing for session tickets <= TLS1.2; not relevant for 1.3 */
  91         if (!TEST_true(SSL_CTX_set_max_proto_version(ctx, TLS1_2_VERSION)))
  92             goto end;
  93 #endif
  94         break;
  95
  96     case TEST_ADD_PADDING_AND_PSK:
  97         /*
  98          * In this case we're doing TLSv1.3 and we're sending a PSK so the
  99          * ClientHello is already going to be quite long. To avoid getting one
 100          * that is too long for this test we use a restricted ciphersuite list
 101          */
 102         if (!TEST_true(SSL_CTX_set_cipher_list(ctx, "")))
 103             goto end;
 104          /* Fall through */
 105     case TEST_ADD_PADDING:
 106     case TEST_PADDING_NOT_NEEDED:
 107         SSL_CTX_set_options(ctx, SSL_OP_TLSEXT_PADDING);
 108         /* Make sure we get a consistent size across TLS versions */
 109         SSL_CTX_clear_options(ctx, SSL_OP_ENABLE_MIDDLEBOX_COMPAT);
 110         /*
 111          * Add some dummy ALPN protocols so that the ClientHello is at least
 112          * F5_WORKAROUND_MIN_MSG_LEN bytes long - meaning padding will be
 113          * needed.
 114          */
 115         if (currtest == TEST_ADD_PADDING) {
 116              if (!TEST_false(SSL_CTX_set_alpn_protos(ctx,
 117                                     (unsigned char *)alpn_prots,
 118                                     sizeof(alpn_prots) - 1)))
 119                 goto end;
 120         /*
 121          * Otherwise we need to make sure we have a small enough message to
 122          * not need padding.
 123          */
 124         } else if (!TEST_true(SSL_CTX_set_cipher_list(ctx,
 125                               "AES128-SHA"))
 126                    || !TEST_true(SSL_CTX_set_ciphersuites(ctx,
 127                                  "TLS_AES_128_GCM_SHA256"))) {
 128             goto end;
 129         }
 130         break;
 131
 132     default:
 133         goto end;
 134     }
 135
 136     con = SSL_new(ctx);
 137     if (!TEST_ptr(con))
 138         goto end;
 139
 140     if (currtest == TEST_ADD_PADDING_AND_PSK) {
 141         sessbio = BIO_new_file(sessionfile, "r");
 142         if (!TEST_ptr(sessbio)) {
 143             TEST_info("Unable to open session.pem");
 144             goto end;
 145         }
 146         sess = PEM_read_bio_SSL_SESSION(sessbio, NULL, NULL, NULL);
 147         if (!TEST_ptr(sess)) {
 148             TEST_info("Unable to load SSL_SESSION");
 149             goto end;
 150         }
 151         /*
 152          * We reset the creation time so that we don't discard the session as
 153          * too old.
 154          */
 155         if (!TEST_true(SSL_SESSION_set_time(sess, (long)time(NULL)))
 156                 || !TEST_true(SSL_set_session(con, sess)))
 157             goto end;
 158     }
 159
 160     rbio = BIO_new(BIO_s_mem());
 161     wbio = BIO_new(BIO_s_mem());
 162     if (!TEST_ptr(rbio)|| !TEST_ptr(wbio)) {
 163         BIO_free(rbio);
 164         BIO_free(wbio);
 165         goto end;
 166     }
 167
 168     SSL_set_bio(con, rbio, wbio);
 169     SSL_set_connect_state(con);
 170
 171     if (currtest == TEST_SET_SESSION_TICK_DATA_VER_NEG) {
 172         if (!TEST_true(SSL_set_session_ticket_ext(con, dummytick,
 173                                                   strlen(dummytick))))
 174             goto end;
 175     }
 176
 177     if (!TEST_int_le(SSL_connect(con), 0)) {
 178         /* This shouldn't succeed because we don't have a server! */
 179         goto end;
 180     }
 181
 182     len = BIO_get_mem_data(wbio, (char **)&data);
 183     if (!TEST_true(PACKET_buf_init(&pkt, data, len))
 184                /* Skip the record header */
 185             || !PACKET_forward(&pkt, SSL3_RT_HEADER_LENGTH))
 186         goto end;
 187
 188     msglen = PACKET_remaining(&pkt);
 189
 190     /* Skip the handshake message header */
 191     if (!TEST_true(PACKET_forward(&pkt, SSL3_HM_HEADER_LENGTH))
 192                /* Skip client version and random */
 193             || !TEST_true(PACKET_forward(&pkt, CLIENT_VERSION_LEN
 194                                                + SSL3_RANDOM_SIZE))
 195                /* Skip session id */
 196             || !TEST_true(PACKET_get_length_prefixed_1(&pkt, &pkt2))
 197                /* Skip ciphers */
 198             || !TEST_true(PACKET_get_length_prefixed_2(&pkt, &pkt2))
 199                /* Skip compression */
 200             || !TEST_true(PACKET_get_length_prefixed_1(&pkt, &pkt2))
 201                /* Extensions len */
 202             || !TEST_true(PACKET_as_length_prefixed_2(&pkt, &pkt2)))
 203         goto end;
 204
 205     /* Loop through all extensions */
 206     while (PACKET_remaining(&pkt2)) {
 207
 208         if (!TEST_true(PACKET_get_net_2(&pkt2, &type))
 209                 || !TEST_true(PACKET_get_length_prefixed_2(&pkt2, &pkt3)))
 210             goto end;
 211
 212         if (type == TLSEXT_TYPE_session_ticket) {
 213             if (currtest == TEST_SET_SESSION_TICK_DATA_VER_NEG) {
 214                 if (TEST_true(PACKET_equal(&pkt3, dummytick,
 215                                            strlen(dummytick)))) {
 216                     /* Ticket data is as we expected */
 217                     testresult = 1;
 218                 }
 219                 goto end;
 220             }
 221         }
 222         if (type == TLSEXT_TYPE_padding) {
 223             if (!TEST_false(currtest == TEST_PADDING_NOT_NEEDED))
 224                 goto end;
 225             else if (TEST_true(currtest == TEST_ADD_PADDING
 226                     || currtest == TEST_ADD_PADDING_AND_PSK))
 227                 testresult = TEST_true(msglen == F5_WORKAROUND_MAX_MSG_LEN);
 228         }
 229     }
 230
 231     if (currtest == TEST_PADDING_NOT_NEEDED)
 232         testresult = 1;
 233
 234 end:
 235     SSL_free(con);
 236     SSL_CTX_free(ctx);
 237     SSL_SESSION_free(sess);
 238     BIO_free(sessbio);
 239
 240     return testresult;
 241 }
 242
 243 int setup_tests(void)
 244 {
 245     if (!TEST_ptr(sessionfile = test_get_argument(0)))
 246         return 0;
 247
 248     ADD_ALL_TESTS(test_client_hello, TOTAL_NUM_TESTS);
 249     return 1;
 250 }