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
 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                     expectedrecvers = TLS1_VERSION;
 132
 133                     /* Save the session id for later */
 134                     chsessidlen = PACKET_remaining(&sessionid);
 135                     if (!PACKET_copy_bytes(&sessionid, chsessid, chsessidlen))
 136                         return 0;
 137                 } else {
 138                     /*
 139                      * Check the session id for the second ClientHello is the
 140                      * same as the first one.
 141                      */
 142                     if (PACKET_remaining(&sessionid) != chsessidlen
 143                             || (chsessidlen > 0
 144                                 && memcmp(chsessid, PACKET_data(&sessionid),
 145                                           chsessidlen) != 0))
 146                         badsessid = 1;
 147                 }
 148             } else if (msgtype == SSL3_MT_SERVER_HELLO) {
 149                 shseen++;
 150                 /*
 151                  * Skip legacy_version (2 bytes) and Random (32 bytes) to read
 152                  * session_id.
 153                  */
 154                 if (!PACKET_forward(&msgbody, 34)
 155                         || !PACKET_get_length_prefixed_1(&msgbody, &sessionid))
 156                     return 0;
 157
 158                 /*
 159                  * Check the session id is the same as the one in the
 160                  * ClientHello
 161                  */
 162                 if (PACKET_remaining(&sessionid) != chsessidlen
 163                         || (chsessidlen > 0
 164                             && memcmp(chsessid, PACKET_data(&sessionid),
 165                                       chsessidlen) != 0))
 166                     badsessid = 1;
 167             }
 168         } else if (rectype == SSL3_RT_CHANGE_CIPHER_SPEC) {
 169             if (bio == s_to_c_fbio) {
 170                 /*
 171                  * Server writing. We shouldn't have written any app data
 172                  * yet, and we should have seen both the ClientHello and the
 173                  * ServerHello
 174                  */
 175                 if (!sappdataseen
 176                         && chseen == 1
 177                         && shseen == 1
 178                         && !sccsseen)
 179                     sccsseen = 1;
 180                 else
 181                     badccs = 1;
 182             } else if (!cappdataseen) {
 183                 /*
 184                  * Client writing. We shouldn't have written any app data
 185                  * yet, and we should have seen the ClientHello
 186                  */
 187                 if (shseen == 1 && !ccsaftersh)
 188                     ccsaftersh = 1;
 189                 else if (shseen == 0 && !ccsbeforesh)
 190                     ccsbeforesh = 1;
 191                 else
 192                     badccs = 1;
 193             } else {
 194                 badccs = 1;
 195             }
 196         } else if(rectype == SSL3_RT_APPLICATION_DATA) {
 197             if (bio == s_to_c_fbio)
 198                 sappdataseen = 1;
 199             else
 200                 cappdataseen = 1;
 201         }
 202         if (recvers != expectedrecvers)
 203             badvers = 1;
 204     }
 205
 206     ret = BIO_write(next, in, inl);
 207     if (ret <= 0 && BIO_should_write(next))
 208         BIO_set_retry_write(bio);
 209
 210     return ret;
 211 }
 212
 213 static long watchccs_ctrl(BIO *bio, int cmd, long num, void *ptr)
 214 {
 215     long ret;
 216     BIO *next = BIO_next(bio);
 217
 218     if (next == NULL)
 219         return 0;
 220
 221     switch (cmd) {
 222     case BIO_CTRL_DUP:
 223         ret = 0;
 224         break;
 225     default:
 226         ret = BIO_ctrl(next, cmd, num, ptr);
 227         break;
 228     }
 229     return ret;
 230 }
 231
 232 static int watchccs_gets(BIO *bio, char *buf, int size)
 233 {
 234     /* We don't support this - not needed anyway */
 235     return -1;
 236 }
 237
 238 static int watchccs_puts(BIO *bio, const char *str)
 239 {
 240     return watchccs_write(bio, str, strlen(str));
 241 }
 242
 243 static int test_tls13ccs(int tst)
 244 {
 245     SSL_CTX *sctx = NULL, *cctx = NULL;
 246     SSL *sssl = NULL, *cssl = NULL;
 247     int ret = 0;
 248     const char msg[] = "Dummy data";
 249     char buf[80];
 250     size_t written, readbytes;
 251     SSL_SESSION *sess = NULL;
 252
 253     chseen = shseen = sccsseen = ccsaftersh = ccsbeforesh = 0;
 254     sappdataseen = cappdataseen = badccs = badvers = badsessid = 0;
 255     chsessidlen = 0;
 256
 257     if (!TEST_true(create_ssl_ctx_pair(TLS_server_method(), TLS_client_method(),
 258                                        &sctx, &cctx, cert, privkey)))
 259         goto err;
 260
 261     /*
 262      * Test 0: Simple Handshake
 263      * Test 1: Simple Handshake, client middlebox compat mode disabled
 264      * Test 2: Simple Handshake, server middlebox compat mode disabled
 265      * Test 3: HRR Handshake
 266      * Test 4: HRR Handshake, client middlebox compat mode disabled
 267      * Test 5: HRR Handshake, server middlebox compat mode disabled
 268      * Test 6: Early data handshake
 269      * Test 7: Early data handshake, client middlebox compat mode disabled
 270      * Test 8: Early data handshake, server middlebox compat mode disabled
 271      * Test 9: Early data then HRR
 272      * Test 10: Early data then HRR, client middlebox compat mode disabled
 273      * Test 11: Early data then HRR, server middlebox compat mode disabled
 274      */
 275     switch (tst) {
 276     case 0:
 277     case 3:
 278     case 6:
 279     case 9:
 280         break;
 281     case 1:
 282     case 4:
 283     case 7:
 284     case 10:
 285         SSL_CTX_clear_options(cctx, SSL_OP_ENABLE_MIDDLEBOX_COMPAT);
 286         break;
 287     case 2:
 288     case 5:
 289     case 8:
 290     case 11:
 291         SSL_CTX_clear_options(sctx, SSL_OP_ENABLE_MIDDLEBOX_COMPAT);
 292         break;
 293     default:
 294         TEST_error("Invalid test value");
 295         goto err;
 296     }
 297
 298     if (tst >= 6) {
 299         /* Get a session suitable for early_data */
 300         if (!TEST_true(create_ssl_objects(sctx, cctx, &sssl, &cssl, NULL, NULL))
 301                 || !TEST_true(create_ssl_connection(sssl, cssl, SSL_ERROR_NONE)))
 302             goto err;
 303         sess = SSL_get1_session(cssl);
 304         if (!TEST_ptr(sess))
 305             goto err;
 306         SSL_shutdown(cssl);
 307         SSL_shutdown(sssl);
 308         SSL_free(sssl);
 309         SSL_free(cssl);
 310         sssl = cssl = NULL;
 311     }
 312
 313     if ((tst >= 3 && tst <= 5) || tst >= 9) {
 314         /* HRR handshake */
 315         if (!TEST_true(SSL_CTX_set1_groups_list(sctx, "P-256")))
 316             goto err;
 317     }
 318
 319     s_to_c_fbio = BIO_new(bio_f_watchccs_filter());
 320     c_to_s_fbio = BIO_new(bio_f_watchccs_filter());
 321     if (!TEST_ptr(s_to_c_fbio)
 322             || !TEST_ptr(c_to_s_fbio)) {
 323         BIO_free(s_to_c_fbio);
 324         BIO_free(c_to_s_fbio);
 325         goto err;
 326     }
 327
 328     /* BIOs get freed on error */
 329     if (!TEST_true(create_ssl_objects(sctx, cctx, &sssl, &cssl, s_to_c_fbio,
 330                                       c_to_s_fbio)))
 331         goto err;
 332
 333     if (tst >= 6) {
 334         /* Early data */
 335         if (!TEST_true(SSL_set_session(cssl, sess))
 336                 || !TEST_true(SSL_write_early_data(cssl, msg, strlen(msg),
 337                                                    &written))
 338                 || (tst <= 8
 339                     && !TEST_int_eq(SSL_read_early_data(sssl, buf,  sizeof(buf),
 340                                                 &readbytes),
 341                                                 SSL_READ_EARLY_DATA_SUCCESS)))
 342             goto err;
 343         if (tst <= 8) {
 344             if (!TEST_int_gt(SSL_connect(cssl), 0))
 345                 goto err;
 346         } else {
 347             if (!TEST_int_le(SSL_connect(cssl), 0))
 348                 goto err;
 349         }
 350         if (!TEST_int_eq(SSL_read_early_data(sssl, buf,  sizeof(buf),
 351                                              &readbytes),
 352                          SSL_READ_EARLY_DATA_FINISH))
 353             goto err;
 354     }
 355
 356     /* Perform handshake (or complete it if doing early data ) */
 357     if (!TEST_true(create_ssl_connection(sssl, cssl, SSL_ERROR_NONE)))
 358         goto err;
 359
 360     /*
 361      * Check there were no unexpected CCS messages, all record versions
 362      * were as expected, and that the session ids were reflected by the server
 363      * correctly.
 364      */
 365     if (!TEST_false(badccs) || !TEST_false(badvers) || !TEST_false(badsessid))
 366         goto err;
 367
 368     switch (tst) {
 369     case 0:
 370         if (!TEST_true(sccsseen)
 371                 || !TEST_true(ccsaftersh)
 372                 || !TEST_false(ccsbeforesh)
 373                 || !TEST_size_t_gt(chsessidlen, 0))
 374             goto err;
 375         break;
 376
 377     case 1:
 378         if (!TEST_true(sccsseen)
 379                 || !TEST_false(ccsaftersh)
 380                 || !TEST_false(ccsbeforesh)
 381                 || !TEST_size_t_eq(chsessidlen, 0))
 382             goto err;
 383         break;
 384
 385     case 2:
 386         if (!TEST_false(sccsseen)
 387                 || !TEST_true(ccsaftersh)
 388                 || !TEST_false(ccsbeforesh)
 389                 || !TEST_size_t_gt(chsessidlen, 0))
 390             goto err;
 391         break;
 392
 393     case 3:
 394         if (!TEST_true(sccsseen)
 395                 || !TEST_true(ccsaftersh)
 396                 || !TEST_false(ccsbeforesh)
 397                 || !TEST_size_t_gt(chsessidlen, 0))
 398             goto err;
 399         break;
 400
 401     case 4:
 402         if (!TEST_true(sccsseen)
 403                 || !TEST_false(ccsaftersh)
 404                 || !TEST_false(ccsbeforesh)
 405                 || !TEST_size_t_eq(chsessidlen, 0))
 406             goto err;
 407         break;
 408
 409     case 5:
 410         if (!TEST_false(sccsseen)
 411                 || !TEST_true(ccsaftersh)
 412                 || !TEST_false(ccsbeforesh)
 413                 || !TEST_size_t_gt(chsessidlen, 0))
 414             goto err;
 415         break;
 416
 417     case 6:
 418         if (!TEST_true(sccsseen)
 419                 || !TEST_false(ccsaftersh)
 420                 || !TEST_true(ccsbeforesh)
 421                 || !TEST_size_t_gt(chsessidlen, 0))
 422             goto err;
 423         break;
 424
 425     case 7:
 426         if (!TEST_true(sccsseen)
 427                 || !TEST_false(ccsaftersh)
 428                 || !TEST_false(ccsbeforesh)
 429                 || !TEST_size_t_eq(chsessidlen, 0))
 430             goto err;
 431         break;
 432
 433     case 8:
 434         if (!TEST_false(sccsseen)
 435                 || !TEST_false(ccsaftersh)
 436                 || !TEST_true(ccsbeforesh)
 437                 || !TEST_size_t_gt(chsessidlen, 0))
 438             goto err;
 439         break;
 440
 441     case 9:
 442         if (!TEST_true(sccsseen)
 443                 || !TEST_false(ccsaftersh)
 444                 || !TEST_true(ccsbeforesh)
 445                 || !TEST_size_t_gt(chsessidlen, 0))
 446             goto err;
 447         break;
 448
 449     case 10:
 450         if (!TEST_true(sccsseen)
 451                 || !TEST_false(ccsaftersh)
 452                 || !TEST_false(ccsbeforesh)
 453                 || !TEST_size_t_eq(chsessidlen, 0))
 454             goto err;
 455         break;
 456
 457     case 11:
 458         if (!TEST_false(sccsseen)
 459                 || !TEST_false(ccsaftersh)
 460                 || !TEST_true(ccsbeforesh)
 461                 || !TEST_size_t_gt(chsessidlen, 0))
 462             goto err;
 463         break;
 464
 465     default:
 466         TEST_error("Invalid test value");
 467         goto err;
 468     }
 469
 470     ret = 1;
 471  err:
 472     SSL_SESSION_free(sess);
 473     SSL_free(sssl);
 474     SSL_free(cssl);
 475     SSL_CTX_free(sctx);
 476     SSL_CTX_free(cctx);
 477
 478     return ret;
 479 }
 480
 481 int setup_tests(void)
 482 {
 483     if (!TEST_ptr(cert = test_get_argument(0))
 484             || !TEST_ptr(privkey = test_get_argument(1)))
 485         return 0;
 486
 487     ADD_ALL_TESTS(test_tls13ccs, 12);
 488
 489     return 1;
 490 }
 491
 492 void cleanup_tests(void)
 493 {
 494     BIO_meth_free(method_watchccs);
 495 }