test/tls13ccstest.c

   1 /*
   2  * Copyright 2017 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 <openssl/ssl.h>
  11 #include <string.h>
  12 #include "ssltestlib.h"
  13 #include "testutil.h"
  14 #include "../ssl/packet_locl.h"
  15
  16 static char *cert = NULL;
  17 static char *privkey = NULL;
  18
  19 static BIO *s_to_c_fbio = NULL, *c_to_s_fbio = NULL;
  20 static int chseen = 0, shseen = 0, sccsseen = 0, ccsaftersh = 0;
  21 static int ccsbeforesh = 0, sappdataseen = 0, cappdataseen = 0, badccs = 0;
  22 static int badvers = 0, badsessid = 0;
  23
  24 static unsigned char chsessid[SSL_MAX_SSL_SESSION_ID_LENGTH];
  25 static size_t chsessidlen = 0;
  26
  27 static int watchccs_new(BIO *bi);
  28 static int watchccs_free(BIO *a);
  29 static int watchccs_read(BIO *b, char *out, int outl);
  30 static int watchccs_write(BIO *b, const char *in, int inl);
  31 static long watchccs_ctrl(BIO *b, int cmd, long num, void *ptr);
  32 static int watchccs_gets(BIO *bp, char *buf, int size);
  33 static int watchccs_puts(BIO *bp, const char *str);
  34
  35 /* Choose a sufficiently large type likely to be unused for this custom BIO */
  36 # define BIO_TYPE_WATCHCCS_FILTER  (0x80 | BIO_TYPE_FILTER)
  37
  38 static BIO_METHOD *method_watchccs = NULL;
  39
  40 static const BIO_METHOD *bio_f_watchccs_filter()
  41 {
  42     if (method_watchccs == NULL) {
  43         method_watchccs = BIO_meth_new(BIO_TYPE_WATCHCCS_FILTER,
  44                                        "Watch CCS filter");
  45         if (   method_watchccs == NULL
  46             || !BIO_meth_set_write(method_watchccs, watchccs_write)
  47             || !BIO_meth_set_read(method_watchccs, watchccs_read)
  48             || !BIO_meth_set_puts(method_watchccs, watchccs_puts)
  49             || !BIO_meth_set_gets(method_watchccs, watchccs_gets)
  50             || !BIO_meth_set_ctrl(method_watchccs, watchccs_ctrl)
  51             || !BIO_meth_set_create(method_watchccs, watchccs_new)
  52             || !BIO_meth_set_destroy(method_watchccs, watchccs_free))
  53             return NULL;
  54     }
  55     return method_watchccs;
  56 }
  57
  58 static int watchccs_new(BIO *bio)
  59 {
  60     BIO_set_init(bio, 1);
  61     return 1;
  62 }
  63
  64 static int watchccs_free(BIO *bio)
  65 {
  66     BIO_set_init(bio, 0);
  67     return 1;
  68 }
  69
  70 static int watchccs_read(BIO *bio, char *out, int outl)
  71 {
  72     int ret = 0;
  73     BIO *next = BIO_next(bio);
  74
  75     if (outl <= 0)
  76         return 0;
  77     if (next == NULL)
  78         return 0;
  79
  80     BIO_clear_retry_flags(bio);
  81
  82     ret = BIO_read(next, out, outl);
  83     if (ret <= 0 && BIO_should_read(next))
  84         BIO_set_retry_read(bio);
  85
  86     return ret;
  87 }
  88
  89 static int watchccs_write(BIO *bio, const char *in, int inl)
  90 {
  91     int ret = 0;
  92     BIO *next = BIO_next(bio);
  93     PACKET pkt, msg, msgbody, sessionid;
  94     unsigned int rectype, recvers, msgtype, expectedrecvers;
  95
  96     if (inl <= 0)
  97         return 0;
  98     if (next == NULL)
  99         return 0;
 100
 101     BIO_clear_retry_flags(bio);
 102
 103     if (!PACKET_buf_init(&pkt, (const unsigned char *)in, inl))
 104         return 0;
 105
 106     /* We assume that we always write complete records each time */
 107     while (PACKET_remaining(&pkt)) {
 108         if (!PACKET_get_1(&pkt, &rectype)
 109                 || !PACKET_get_net_2(&pkt, &recvers)
 110                 || !PACKET_get_length_prefixed_2(&pkt, &msg))
 111             return 0;
 112
 113         expectedrecvers = TLS1_2_VERSION;
 114
 115         if (rectype == SSL3_RT_HANDSHAKE) {
 116             if (!PACKET_get_1(&msg, &msgtype)
 117                     || !PACKET_get_length_prefixed_3(&msg, &msgbody))
 118                 return 0;
 119             if (msgtype == SSL3_MT_CLIENT_HELLO) {
 120                 chseen++;
 121                 expectedrecvers = TLS1_VERSION;
 122                 /*
 123                  * Skip legacy_version (2 bytes) and Random (32 bytes) to read
 124                  * session_id.
 125                  */
 126                 if (!PACKET_forward(&msgbody, 34)
 127                         || !PACKET_get_length_prefixed_1(&msgbody, &sessionid))
 128                     return 0;
 129
 130                 if (chseen == 1) {
 131                     /* Save the session id for later */
 132                     chsessidlen = PACKET_remaining(&sessionid);
 133                     if (!PACKET_copy_bytes(&sessionid, chsessid, chsessidlen))
 134                         return 0;
 135                 } else {
 136                     /*
 137                      * Check the session id for the second ClientHello is the
 138                      * same as the first one.
 139                      */
 140                     if (PACKET_remaining(&sessionid) != chsessidlen
 141                             || (chsessidlen > 0
 142                                 && memcmp(chsessid, PACKET_data(&sessionid),
 143                                           chsessidlen) != 0))
 144                         badsessid = 1;
 145                 }
 146             } else if (msgtype == SSL3_MT_SERVER_HELLO) {
 147                 shseen++;
 148                 /*
 149                  * Skip legacy_version (2 bytes) and Random (32 bytes) to read
 150                  * session_id.
 151                  */
 152                 if (!PACKET_forward(&msgbody, 34)
 153                         || !PACKET_get_length_prefixed_1(&msgbody, &sessionid))
 154                     return 0;
 155
 156                 /*
 157                  * Check the session id is the same as the one in the
 158                  * ClientHello
 159                  */
 160                 if (PACKET_remaining(&sessionid) != chsessidlen
 161                         || (chsessidlen > 0
 162                             && memcmp(chsessid, PACKET_data(&sessionid),
 163                                       chsessidlen) != 0))
 164                     badsessid = 1;
 165             }
 166         } else if (rectype == SSL3_RT_CHANGE_CIPHER_SPEC) {
 167             if (bio == s_to_c_fbio) {
 168                 /*
 169                  * Server writing. We shouldn't have written any app data
 170                  * yet, and we should have seen both the ClientHello and the
 171                  * ServerHello
 172                  */
 173                 if (!sappdataseen
 174                         && chseen == 1
 175                         && shseen == 1
 176                         && !sccsseen)
 177                     sccsseen = 1;
 178                 else
 179                     badccs = 1;
 180             } else if (!cappdataseen) {
 181                 /*
 182                  * Client writing. We shouldn't have written any app data
 183                  * yet, and we should have seen the ClientHello
 184                  */
 185                 if (shseen == 1 && !ccsaftersh)
 186                     ccsaftersh = 1;
 187                 else if (shseen == 0 && !ccsbeforesh)
 188                     ccsbeforesh = 1;
 189                 else
 190                     badccs = 1;
 191             } else {
 192                 badccs = 1;
 193             }
 194         } else if(rectype == SSL3_RT_APPLICATION_DATA) {
 195             if (bio == s_to_c_fbio)
 196                 sappdataseen = 1;
 197             else
 198                 cappdataseen = 1;
 199         }
 200         if (recvers != expectedrecvers)
 201             badvers = 1;
 202     }
 203
 204     ret = BIO_write(next, in, inl);
 205     if (ret <= 0 && BIO_should_write(next))
 206         BIO_set_retry_write(bio);
 207
 208     return ret;
 209 }
 210
 211 static long watchccs_ctrl(BIO *bio, int cmd, long num, void *ptr)
 212 {
 213     long ret;
 214     BIO *next = BIO_next(bio);
 215
 216     if (next == NULL)
 217         return 0;
 218
 219     switch (cmd) {
 220     case BIO_CTRL_DUP:
 221         ret = 0;
 222         break;
 223     default:
 224         ret = BIO_ctrl(next, cmd, num, ptr);
 225         break;
 226     }
 227     return ret;
 228 }
 229
 230 static int watchccs_gets(BIO *bio, char *buf, int size)
 231 {
 232     /* We don't support this - not needed anyway */
 233     return -1;
 234 }
 235
 236 static int watchccs_puts(BIO *bio, const char *str)
 237 {
 238     return watchccs_write(bio, str, strlen(str));
 239 }
 240
 241 static int test_tls13ccs(int tst)
 242 {
 243     SSL_CTX *sctx = NULL, *cctx = NULL;
 244     SSL *sssl = NULL, *cssl = NULL;
 245     int ret = 0;
 246     const char msg[] = "Dummy data";
 247     char buf[80];
 248     size_t written, readbytes;
 249     SSL_SESSION *sess = NULL;
 250
 251     chseen = shseen = sccsseen = ccsaftersh = ccsbeforesh = 0;
 252     sappdataseen = cappdataseen = badccs = badvers = badsessid = 0;
 253     chsessidlen = 0;
 254
 255     if (!TEST_true(create_ssl_ctx_pair(TLS_server_method(), TLS_client_method(),
 256                                        &sctx, &cctx, cert, privkey)))
 257         goto err;
 258
 259     /*
 260      * Test 0: Simple Handshake
 261      * Test 1: Simple Handshake, client middlebox compat mode disabled
 262      * Test 2: Simple Handshake, server middlebox compat mode disabled
 263      * Test 3: HRR Handshake
 264      * Test 4: HRR Handshake, client middlebox compat mode disabled
 265      * Test 5: HRR Handshake, server middlebox compat mode disabled
 266      * Test 6: Early data handshake
 267      * Test 7: Early data handshake, client middlebox compat mode disabled
 268      * Test 8: Early data handshake, server middlebox compat mode disabled
 269      * Test 9: Early data then HRR
 270      * Test 10: Early data then HRR, client middlebox compat mode disabled
 271      * Test 11: Early data then HRR, server middlebox compat mode disabled
 272      */
 273     switch (tst) {
 274     case 0:
 275     case 3:
 276     case 6:
 277     case 9:
 278         break;
 279     case 1:
 280     case 4:
 281     case 7:
 282     case 10:
 283         SSL_CTX_clear_options(cctx, SSL_OP_ENABLE_MIDDLEBOX_COMPAT);
 284         break;
 285     case 2:
 286     case 5:
 287     case 8:
 288     case 11:
 289         SSL_CTX_clear_options(sctx, SSL_OP_ENABLE_MIDDLEBOX_COMPAT);
 290         break;
 291     default:
 292         TEST_error("Invalid test value");
 293         goto err;
 294     }
 295
 296     if (tst >= 6) {
 297         /* Get a session suitable for early_data */
 298         if (!TEST_true(create_ssl_objects(sctx, cctx, &sssl, &cssl, NULL, NULL))
 299                 || !TEST_true(create_ssl_connection(sssl, cssl, SSL_ERROR_NONE)))
 300             goto err;
 301         sess = SSL_get1_session(cssl);
 302         if (!TEST_ptr(sess))
 303             goto err;
 304         SSL_shutdown(cssl);
 305         SSL_shutdown(sssl);
 306         SSL_free(sssl);
 307         SSL_free(cssl);
 308         sssl = cssl = NULL;
 309     }
 310
 311     if ((tst >= 3 && tst <= 5) || tst >= 9) {
 312         /* HRR handshake */
 313         if (!TEST_true(SSL_CTX_set1_groups_list(sctx, "P-256")))
 314             goto err;
 315     }
 316
 317     s_to_c_fbio = BIO_new(bio_f_watchccs_filter());
 318     c_to_s_fbio = BIO_new(bio_f_watchccs_filter());
 319     if (!TEST_ptr(s_to_c_fbio)
 320             || !TEST_ptr(c_to_s_fbio)) {
 321         BIO_free(s_to_c_fbio);
 322         BIO_free(c_to_s_fbio);
 323         goto err;
 324     }
 325
 326     /* BIOs get freed on error */
 327     if (!TEST_true(create_ssl_objects(sctx, cctx, &sssl, &cssl, s_to_c_fbio,
 328                                       c_to_s_fbio)))
 329         goto err;
 330
 331     if (tst >= 6) {
 332         /* Early data */
 333         if (!TEST_true(SSL_set_session(cssl, sess))
 334                 || !TEST_true(SSL_write_early_data(cssl, msg, strlen(msg),
 335                                                    &written))
 336                 || (tst <= 8
 337                     && !TEST_int_eq(SSL_read_early_data(sssl, buf,  sizeof(buf),
 338                                                 &readbytes),
 339                                                 SSL_READ_EARLY_DATA_SUCCESS)))
 340             goto err;
 341         if (tst <= 8) {
 342             if (!TEST_int_gt(SSL_connect(cssl), 0))
 343                 goto err;
 344         } else {
 345             if (!TEST_int_le(SSL_connect(cssl), 0))
 346                 goto err;
 347         }
 348         if (!TEST_int_eq(SSL_read_early_data(sssl, buf,  sizeof(buf),
 349                                              &readbytes),
 350                          SSL_READ_EARLY_DATA_FINISH))
 351             goto err;
 352     }
 353
 354     /* Perform handshake (or complete it if doing early data ) */
 355     if (!TEST_true(create_ssl_connection(sssl, cssl, SSL_ERROR_NONE)))
 356         goto err;
 357
 358     /*
 359      * Check there were no unexpected CCS messages, all record versions
 360      * were as expected, and that the session ids were reflected by the server
 361      * correctly.
 362      */
 363     if (!TEST_false(badccs) || !TEST_false(badvers) || !TEST_false(badsessid))
 364         goto err;
 365
 366     switch (tst) {
 367     case 0:
 368         if (!TEST_true(sccsseen)
 369                 || !TEST_true(ccsaftersh)
 370                 || !TEST_false(ccsbeforesh)
 371                 || !TEST_size_t_gt(chsessidlen, 0))
 372             goto err;
 373         break;
 374
 375     case 1:
 376         if (!TEST_true(sccsseen)
 377                 || !TEST_false(ccsaftersh)
 378                 || !TEST_false(ccsbeforesh)
 379                 || !TEST_size_t_eq(chsessidlen, 0))
 380             goto err;
 381         break;
 382
 383     case 2:
 384         if (!TEST_false(sccsseen)
 385                 || !TEST_true(ccsaftersh)
 386                 || !TEST_false(ccsbeforesh)
 387                 || !TEST_size_t_gt(chsessidlen, 0))
 388             goto err;
 389         break;
 390
 391     case 3:
 392         if (!TEST_true(sccsseen)
 393                 || !TEST_true(ccsaftersh)
 394                 || !TEST_false(ccsbeforesh)
 395                 || !TEST_size_t_gt(chsessidlen, 0))
 396             goto err;
 397         break;
 398
 399     case 4:
 400         if (!TEST_true(sccsseen)
 401                 || !TEST_false(ccsaftersh)
 402                 || !TEST_false(ccsbeforesh)
 403                 || !TEST_size_t_eq(chsessidlen, 0))
 404             goto err;
 405         break;
 406
 407     case 5:
 408         if (!TEST_false(sccsseen)
 409                 || !TEST_true(ccsaftersh)
 410                 || !TEST_false(ccsbeforesh)
 411                 || !TEST_size_t_gt(chsessidlen, 0))
 412             goto err;
 413         break;
 414
 415     case 6:
 416         if (!TEST_true(sccsseen)
 417                 || !TEST_false(ccsaftersh)
 418                 || !TEST_true(ccsbeforesh)
 419                 || !TEST_size_t_gt(chsessidlen, 0))
 420             goto err;
 421         break;
 422
 423     case 7:
 424         if (!TEST_true(sccsseen)
 425                 || !TEST_false(ccsaftersh)
 426                 || !TEST_false(ccsbeforesh)
 427                 || !TEST_size_t_eq(chsessidlen, 0))
 428             goto err;
 429         break;
 430
 431     case 8:
 432         if (!TEST_false(sccsseen)
 433                 || !TEST_false(ccsaftersh)
 434                 || !TEST_true(ccsbeforesh)
 435                 || !TEST_size_t_gt(chsessidlen, 0))
 436             goto err;
 437         break;
 438
 439     case 9:
 440         if (!TEST_true(sccsseen)
 441                 || !TEST_false(ccsaftersh)
 442                 || !TEST_true(ccsbeforesh)
 443                 || !TEST_size_t_gt(chsessidlen, 0))
 444             goto err;
 445         break;
 446
 447     case 10:
 448         if (!TEST_true(sccsseen)
 449                 || !TEST_false(ccsaftersh)
 450                 || !TEST_false(ccsbeforesh)
 451                 || !TEST_size_t_eq(chsessidlen, 0))
 452             goto err;
 453         break;
 454
 455     case 11:
 456         if (!TEST_false(sccsseen)
 457                 || !TEST_false(ccsaftersh)
 458                 || !TEST_true(ccsbeforesh)
 459                 || !TEST_size_t_gt(chsessidlen, 0))
 460             goto err;
 461         break;
 462
 463     default:
 464         TEST_error("Invalid test value");
 465         goto err;
 466     }
 467
 468     ret = 1;
 469  err:
 470     SSL_SESSION_free(sess);
 471     SSL_free(sssl);
 472     SSL_free(cssl);
 473     SSL_CTX_free(sctx);
 474     SSL_CTX_free(cctx);
 475
 476     return ret;
 477 }
 478
 479 int setup_tests(void)
 480 {
 481     if (!TEST_ptr(cert = test_get_argument(0))
 482             || !TEST_ptr(privkey = test_get_argument(1)))
 483         return 0;
 484
 485     ADD_ALL_TESTS(test_tls13ccs, 12);
 486
 487     return 1;
 488 }
 489
 490 void cleanup_tests(void)
 491 {
 492     BIO_meth_free(method_watchccs);
 493 }