test/ssltestlib.c

   1 /*
   2  * Copyright 2016-2018 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 "internal/nelem.h"
  13 #include "ssltestlib.h"
  14 #include "testutil.h"
  15
  16 static int tls_dump_new(BIO *bi);
  17 static int tls_dump_free(BIO *a);
  18 static int tls_dump_read(BIO *b, char *out, int outl);
  19 static int tls_dump_write(BIO *b, const char *in, int inl);
  20 static long tls_dump_ctrl(BIO *b, int cmd, long num, void *ptr);
  21 static int tls_dump_gets(BIO *bp, char *buf, int size);
  22 static int tls_dump_puts(BIO *bp, const char *str);
  23
  24 /* Choose a sufficiently large type likely to be unused for this custom BIO */
  25 #define BIO_TYPE_TLS_DUMP_FILTER  (0x80 | BIO_TYPE_FILTER)
  26 #define BIO_TYPE_MEMPACKET_TEST    0x81
  27
  28 static BIO_METHOD *method_tls_dump = NULL;
  29 static BIO_METHOD *meth_mem = NULL;
  30
  31 /* Note: Not thread safe! */
  32 const BIO_METHOD *bio_f_tls_dump_filter(void)
  33 {
  34     if (method_tls_dump == NULL) {
  35         method_tls_dump = BIO_meth_new(BIO_TYPE_TLS_DUMP_FILTER,
  36                                         "TLS dump filter");
  37         if (   method_tls_dump == NULL
  38             || !BIO_meth_set_write(method_tls_dump, tls_dump_write)
  39             || !BIO_meth_set_read(method_tls_dump, tls_dump_read)
  40             || !BIO_meth_set_puts(method_tls_dump, tls_dump_puts)
  41             || !BIO_meth_set_gets(method_tls_dump, tls_dump_gets)
  42             || !BIO_meth_set_ctrl(method_tls_dump, tls_dump_ctrl)
  43             || !BIO_meth_set_create(method_tls_dump, tls_dump_new)
  44             || !BIO_meth_set_destroy(method_tls_dump, tls_dump_free))
  45             return NULL;
  46     }
  47     return method_tls_dump;
  48 }
  49
  50 void bio_f_tls_dump_filter_free(void)
  51 {
  52     BIO_meth_free(method_tls_dump);
  53 }
  54
  55 static int tls_dump_new(BIO *bio)
  56 {
  57     BIO_set_init(bio, 1);
  58     return 1;
  59 }
  60
  61 static int tls_dump_free(BIO *bio)
  62 {
  63     BIO_set_init(bio, 0);
  64
  65     return 1;
  66 }
  67
  68 static void copy_flags(BIO *bio)
  69 {
  70     int flags;
  71     BIO *next = BIO_next(bio);
  72
  73     flags = BIO_test_flags(next, BIO_FLAGS_SHOULD_RETRY | BIO_FLAGS_RWS);
  74     BIO_clear_flags(bio, BIO_FLAGS_SHOULD_RETRY | BIO_FLAGS_RWS);
  75     BIO_set_flags(bio, flags);
  76 }
  77
  78 #define RECORD_CONTENT_TYPE     0
  79 #define RECORD_VERSION_HI       1
  80 #define RECORD_VERSION_LO       2
  81 #define RECORD_EPOCH_HI         3
  82 #define RECORD_EPOCH_LO         4
  83 #define RECORD_SEQUENCE_START   5
  84 #define RECORD_SEQUENCE_END     10
  85 #define RECORD_LEN_HI           11
  86 #define RECORD_LEN_LO           12
  87
  88 #define MSG_TYPE                0
  89 #define MSG_LEN_HI              1
  90 #define MSG_LEN_MID             2
  91 #define MSG_LEN_LO              3
  92 #define MSG_SEQ_HI              4
  93 #define MSG_SEQ_LO              5
  94 #define MSG_FRAG_OFF_HI         6
  95 #define MSG_FRAG_OFF_MID        7
  96 #define MSG_FRAG_OFF_LO         8
  97 #define MSG_FRAG_LEN_HI         9
  98 #define MSG_FRAG_LEN_MID        10
  99 #define MSG_FRAG_LEN_LO         11
 100
 101
 102 static void dump_data(const char *data, int len)
 103 {
 104     int rem, i, content, reclen, msglen, fragoff, fraglen, epoch;
 105     unsigned char *rec;
 106
 107     printf("---- START OF PACKET ----\n");
 108
 109     rem = len;
 110     rec = (unsigned char *)data;
 111
 112     while (rem > 0) {
 113         if (rem != len)
 114             printf("*\n");
 115         printf("*---- START OF RECORD ----\n");
 116         if (rem < DTLS1_RT_HEADER_LENGTH) {
 117             printf("*---- RECORD TRUNCATED ----\n");
 118             break;
 119         }
 120         content = rec[RECORD_CONTENT_TYPE];
 121         printf("** Record Content-type: %d\n", content);
 122         printf("** Record Version: %02x%02x\n",
 123                rec[RECORD_VERSION_HI], rec[RECORD_VERSION_LO]);
 124         epoch = (rec[RECORD_EPOCH_HI] << 8) | rec[RECORD_EPOCH_LO];
 125         printf("** Record Epoch: %d\n", epoch);
 126         printf("** Record Sequence: ");
 127         for (i = RECORD_SEQUENCE_START; i <= RECORD_SEQUENCE_END; i++)
 128             printf("%02x", rec[i]);
 129         reclen = (rec[RECORD_LEN_HI] << 8) | rec[RECORD_LEN_LO];
 130         printf("\n** Record Length: %d\n", reclen);
 131
 132         /* Now look at message */
 133         rec += DTLS1_RT_HEADER_LENGTH;
 134         rem -= DTLS1_RT_HEADER_LENGTH;
 135         if (content == SSL3_RT_HANDSHAKE) {
 136             printf("**---- START OF HANDSHAKE MESSAGE FRAGMENT ----\n");
 137             if (epoch > 0) {
 138                 printf("**---- HANDSHAKE MESSAGE FRAGMENT ENCRYPTED ----\n");
 139             } else if (rem < DTLS1_HM_HEADER_LENGTH
 140                     || reclen < DTLS1_HM_HEADER_LENGTH) {
 141                 printf("**---- HANDSHAKE MESSAGE FRAGMENT TRUNCATED ----\n");
 142             } else {
 143                 printf("*** Message Type: %d\n", rec[MSG_TYPE]);
 144                 msglen = (rec[MSG_LEN_HI] << 16) | (rec[MSG_LEN_MID] << 8)
 145                          | rec[MSG_LEN_LO];
 146                 printf("*** Message Length: %d\n", msglen);
 147                 printf("*** Message sequence: %d\n",
 148                        (rec[MSG_SEQ_HI] << 8) | rec[MSG_SEQ_LO]);
 149                 fragoff = (rec[MSG_FRAG_OFF_HI] << 16)
 150                           | (rec[MSG_FRAG_OFF_MID] << 8)
 151                           | rec[MSG_FRAG_OFF_LO];
 152                 printf("*** Message Fragment offset: %d\n", fragoff);
 153                 fraglen = (rec[MSG_FRAG_LEN_HI] << 16)
 154                           | (rec[MSG_FRAG_LEN_MID] << 8)
 155                           | rec[MSG_FRAG_LEN_LO];
 156                 printf("*** Message Fragment len: %d\n", fraglen);
 157                 if (fragoff + fraglen > msglen)
 158                     printf("***---- HANDSHAKE MESSAGE FRAGMENT INVALID ----\n");
 159                 else if (reclen < fraglen)
 160                     printf("**---- HANDSHAKE MESSAGE FRAGMENT TRUNCATED ----\n");
 161                 else
 162                     printf("**---- END OF HANDSHAKE MESSAGE FRAGMENT ----\n");
 163             }
 164         }
 165         if (rem < reclen) {
 166             printf("*---- RECORD TRUNCATED ----\n");
 167             rem = 0;
 168         } else {
 169             rec += reclen;
 170             rem -= reclen;
 171             printf("*---- END OF RECORD ----\n");
 172         }
 173     }
 174     printf("---- END OF PACKET ----\n\n");
 175     fflush(stdout);
 176 }
 177
 178 static int tls_dump_read(BIO *bio, char *out, int outl)
 179 {
 180     int ret;
 181     BIO *next = BIO_next(bio);
 182
 183     ret = BIO_read(next, out, outl);
 184     copy_flags(bio);
 185
 186     if (ret > 0) {
 187         dump_data(out, ret);
 188     }
 189
 190     return ret;
 191 }
 192
 193 static int tls_dump_write(BIO *bio, const char *in, int inl)
 194 {
 195     int ret;
 196     BIO *next = BIO_next(bio);
 197
 198     ret = BIO_write(next, in, inl);
 199     copy_flags(bio);
 200
 201     return ret;
 202 }
 203
 204 static long tls_dump_ctrl(BIO *bio, int cmd, long num, void *ptr)
 205 {
 206     long ret;
 207     BIO *next = BIO_next(bio);
 208
 209     if (next == NULL)
 210         return 0;
 211
 212     switch (cmd) {
 213     case BIO_CTRL_DUP:
 214         ret = 0L;
 215         break;
 216     default:
 217         ret = BIO_ctrl(next, cmd, num, ptr);
 218         break;
 219     }
 220     return ret;
 221 }
 222
 223 static int tls_dump_gets(BIO *bio, char *buf, int size)
 224 {
 225     /* We don't support this - not needed anyway */
 226     return -1;
 227 }
 228
 229 static int tls_dump_puts(BIO *bio, const char *str)
 230 {
 231     return tls_dump_write(bio, str, strlen(str));
 232 }
 233
 234
 235 struct mempacket_st {
 236     unsigned char *data;
 237     int len;
 238     unsigned int num;
 239     unsigned int type;
 240 };
 241
 242 static void mempacket_free(MEMPACKET *pkt)
 243 {
 244     if (pkt->data != NULL)
 245         OPENSSL_free(pkt->data);
 246     OPENSSL_free(pkt);
 247 }
 248
 249 typedef struct mempacket_test_ctx_st {
 250     STACK_OF(MEMPACKET) *pkts;
 251     unsigned int epoch;
 252     unsigned int currrec;
 253     unsigned int currpkt;
 254     unsigned int lastpkt;
 255     unsigned int noinject;
 256 } MEMPACKET_TEST_CTX;
 257
 258 static int mempacket_test_new(BIO *bi);
 259 static int mempacket_test_free(BIO *a);
 260 static int mempacket_test_read(BIO *b, char *out, int outl);
 261 static int mempacket_test_write(BIO *b, const char *in, int inl);
 262 static long mempacket_test_ctrl(BIO *b, int cmd, long num, void *ptr);
 263 static int mempacket_test_gets(BIO *bp, char *buf, int size);
 264 static int mempacket_test_puts(BIO *bp, const char *str);
 265
 266 const BIO_METHOD *bio_s_mempacket_test(void)
 267 {
 268     if (meth_mem == NULL) {
 269         if (!TEST_ptr(meth_mem = BIO_meth_new(BIO_TYPE_MEMPACKET_TEST,
 270                                               "Mem Packet Test"))
 271             || !TEST_true(BIO_meth_set_write(meth_mem, mempacket_test_write))
 272             || !TEST_true(BIO_meth_set_read(meth_mem, mempacket_test_read))
 273             || !TEST_true(BIO_meth_set_puts(meth_mem, mempacket_test_puts))
 274             || !TEST_true(BIO_meth_set_gets(meth_mem, mempacket_test_gets))
 275             || !TEST_true(BIO_meth_set_ctrl(meth_mem, mempacket_test_ctrl))
 276             || !TEST_true(BIO_meth_set_create(meth_mem, mempacket_test_new))
 277             || !TEST_true(BIO_meth_set_destroy(meth_mem, mempacket_test_free)))
 278             return NULL;
 279     }
 280     return meth_mem;
 281 }
 282
 283 void bio_s_mempacket_test_free(void)
 284 {
 285     BIO_meth_free(meth_mem);
 286 }
 287
 288 static int mempacket_test_new(BIO *bio)
 289 {
 290     MEMPACKET_TEST_CTX *ctx;
 291
 292     if (!TEST_ptr(ctx = OPENSSL_zalloc(sizeof(*ctx))))
 293         return 0;
 294     if (!TEST_ptr(ctx->pkts = sk_MEMPACKET_new_null())) {
 295         OPENSSL_free(ctx);
 296         return 0;
 297     }
 298     BIO_set_init(bio, 1);
 299     BIO_set_data(bio, ctx);
 300     return 1;
 301 }
 302
 303 static int mempacket_test_free(BIO *bio)
 304 {
 305     MEMPACKET_TEST_CTX *ctx = BIO_get_data(bio);
 306
 307     sk_MEMPACKET_pop_free(ctx->pkts, mempacket_free);
 308     OPENSSL_free(ctx);
 309     BIO_set_data(bio, NULL);
 310     BIO_set_init(bio, 0);
 311     return 1;
 312 }
 313
 314 /* Record Header values */
 315 #define EPOCH_HI        4
 316 #define EPOCH_LO        5
 317 #define RECORD_SEQUENCE 10
 318 #define RECORD_LEN_HI   11
 319 #define RECORD_LEN_LO   12
 320
 321 #define STANDARD_PACKET                 0
 322
 323 static int mempacket_test_read(BIO *bio, char *out, int outl)
 324 {
 325     MEMPACKET_TEST_CTX *ctx = BIO_get_data(bio);
 326     MEMPACKET *thispkt;
 327     unsigned char *rec;
 328     int rem;
 329     unsigned int seq, offset, len, epoch;
 330
 331     BIO_clear_retry_flags(bio);
 332     thispkt = sk_MEMPACKET_value(ctx->pkts, 0);
 333     if (thispkt == NULL || thispkt->num != ctx->currpkt) {
 334         /* Probably run out of data */
 335         BIO_set_retry_read(bio);
 336         return -1;
 337     }
 338     (void)sk_MEMPACKET_shift(ctx->pkts);
 339     ctx->currpkt++;
 340
 341     if (outl > thispkt->len)
 342         outl = thispkt->len;
 343
 344     if (thispkt->type != INJECT_PACKET_IGNORE_REC_SEQ) {
 345         /*
 346          * Overwrite the record sequence number. We strictly number them in
 347          * the order received. Since we are actually a reliable transport
 348          * we know that there won't be any re-ordering. We overwrite to deal
 349          * with any packets that have been injected
 350          */
 351         for (rem = thispkt->len, rec = thispkt->data
 352                 ; rem > 0; rec += len, rem -= len) {
 353             if (rem < DTLS1_RT_HEADER_LENGTH)
 354                 return -1;
 355             epoch = (rec[EPOCH_HI] << 8) | rec[EPOCH_LO];
 356             if (epoch != ctx->epoch) {
 357                 ctx->epoch = epoch;
 358                 ctx->currrec = 0;
 359             }
 360             seq = ctx->currrec;
 361             offset = 0;
 362             do {
 363                 rec[RECORD_SEQUENCE - offset] = seq & 0xFF;
 364                 seq >>= 8;
 365                 offset++;
 366             } while (seq > 0);
 367             ctx->currrec++;
 368
 369             len = ((rec[RECORD_LEN_HI] << 8) | rec[RECORD_LEN_LO])
 370                   + DTLS1_RT_HEADER_LENGTH;
 371         }
 372     }
 373
 374     memcpy(out, thispkt->data, outl);
 375     mempacket_free(thispkt);
 376     return outl;
 377 }
 378
 379 int mempacket_test_inject(BIO *bio, const char *in, int inl, int pktnum,
 380                           int type)
 381 {
 382     MEMPACKET_TEST_CTX *ctx = BIO_get_data(bio);
 383     MEMPACKET *thispkt, *looppkt, *nextpkt;
 384     int i;
 385
 386     if (ctx == NULL)
 387         return -1;
 388
 389     /* We only allow injection before we've started writing any data */
 390     if (pktnum >= 0) {
 391         if (ctx->noinject)
 392             return -1;
 393     } else {
 394         ctx->noinject = 1;
 395     }
 396
 397     if (!TEST_ptr(thispkt = OPENSSL_malloc(sizeof(*thispkt))))
 398         return -1;
 399     if (!TEST_ptr(thispkt->data = OPENSSL_malloc(inl))) {
 400         mempacket_free(thispkt);
 401         return -1;
 402     }
 403
 404     memcpy(thispkt->data, in, inl);
 405     thispkt->len = inl;
 406     thispkt->num = (pktnum >= 0) ? (unsigned int)pktnum : ctx->lastpkt;
 407     thispkt->type = type;
 408
 409     for(i = 0; (looppkt = sk_MEMPACKET_value(ctx->pkts, i)) != NULL; i++) {
 410         /* Check if we found the right place to insert this packet */
 411         if (looppkt->num > thispkt->num) {
 412             if (sk_MEMPACKET_insert(ctx->pkts, thispkt, i) == 0) {
 413                 mempacket_free(thispkt);
 414                 return -1;
 415             }
 416             /* If we're doing up front injection then we're done */
 417             if (pktnum >= 0)
 418                 return inl;
 419             /*
 420              * We need to do some accounting on lastpkt. We increment it first,
 421              * but it might now equal the value of injected packets, so we need
 422              * to skip over those
 423              */
 424             ctx->lastpkt++;
 425             do {
 426                 i++;
 427                 nextpkt = sk_MEMPACKET_value(ctx->pkts, i);
 428                 if (nextpkt != NULL && nextpkt->num == ctx->lastpkt)
 429                     ctx->lastpkt++;
 430                 else
 431                     return inl;
 432             } while(1);
 433         } else if (looppkt->num == thispkt->num) {
 434             if (!ctx->noinject) {
 435                 /* We injected two packets with the same packet number! */
 436                 return -1;
 437             }
 438             ctx->lastpkt++;
 439             thispkt->num++;
 440         }
 441     }
 442     /*
 443      * We didn't find any packets with a packet number equal to or greater than
 444      * this one, so we just add it onto the end
 445      */
 446     if (!sk_MEMPACKET_push(ctx->pkts, thispkt)) {
 447         mempacket_free(thispkt);
 448         return -1;
 449     }
 450
 451     if (pktnum < 0)
 452         ctx->lastpkt++;
 453
 454     return inl;
 455 }
 456
 457 static int mempacket_test_write(BIO *bio, const char *in, int inl)
 458 {
 459     return mempacket_test_inject(bio, in, inl, -1, STANDARD_PACKET);
 460 }
 461
 462 static long mempacket_test_ctrl(BIO *bio, int cmd, long num, void *ptr)
 463 {
 464     long ret = 1;
 465     MEMPACKET_TEST_CTX *ctx = BIO_get_data(bio);
 466     MEMPACKET *thispkt;
 467
 468     switch (cmd) {
 469     case BIO_CTRL_EOF:
 470         ret = (long)(sk_MEMPACKET_num(ctx->pkts) == 0);
 471         break;
 472     case BIO_CTRL_GET_CLOSE:
 473         ret = BIO_get_shutdown(bio);
 474         break;
 475     case BIO_CTRL_SET_CLOSE:
 476         BIO_set_shutdown(bio, (int)num);
 477         break;
 478     case BIO_CTRL_WPENDING:
 479         ret = 0L;
 480         break;
 481     case BIO_CTRL_PENDING:
 482         thispkt = sk_MEMPACKET_value(ctx->pkts, 0);
 483         if (thispkt == NULL)
 484             ret = 0;
 485         else
 486             ret = thispkt->len;
 487         break;
 488     case BIO_CTRL_FLUSH:
 489         ret = 1;
 490         break;
 491     case BIO_CTRL_RESET:
 492     case BIO_CTRL_DUP:
 493     case BIO_CTRL_PUSH:
 494     case BIO_CTRL_POP:
 495     default:
 496         ret = 0;
 497         break;
 498     }
 499     return ret;
 500 }
 501
 502 static int mempacket_test_gets(BIO *bio, char *buf, int size)
 503 {
 504     /* We don't support this - not needed anyway */
 505     return -1;
 506 }
 507
 508 static int mempacket_test_puts(BIO *bio, const char *str)
 509 {
 510     return mempacket_test_write(bio, str, strlen(str));
 511 }
 512
 513 int create_ssl_ctx_pair(const SSL_METHOD *sm, const SSL_METHOD *cm,
 514                         int min_proto_version, int max_proto_version,
 515                         SSL_CTX **sctx, SSL_CTX **cctx, char *certfile,
 516                         char *privkeyfile)
 517 {
 518     SSL_CTX *serverctx = NULL;
 519     SSL_CTX *clientctx = NULL;
 520
 521     if (!TEST_ptr(serverctx = SSL_CTX_new(sm))
 522             || (cctx != NULL && !TEST_ptr(clientctx = SSL_CTX_new(cm))))
 523         goto err;
 524
 525     if ((min_proto_version > 0
 526          && !TEST_true(SSL_CTX_set_min_proto_version(serverctx,
 527                                                      min_proto_version)))
 528         || (max_proto_version > 0
 529             && !TEST_true(SSL_CTX_set_max_proto_version(serverctx,
 530                                                         max_proto_version))))
 531         goto err;
 532     if (clientctx != NULL
 533         && ((min_proto_version > 0
 534              && !TEST_true(SSL_CTX_set_min_proto_version(clientctx,
 535                                                          min_proto_version)))
 536             || (max_proto_version > 0
 537                 && !TEST_true(SSL_CTX_set_max_proto_version(clientctx,
 538                                                             max_proto_version)))))
 539         goto err;
 540
 541     if (!TEST_int_eq(SSL_CTX_use_certificate_file(serverctx, certfile,
 542                                                   SSL_FILETYPE_PEM), 1)
 543             || !TEST_int_eq(SSL_CTX_use_PrivateKey_file(serverctx, privkeyfile,
 544                                                         SSL_FILETYPE_PEM), 1)
 545             || !TEST_int_eq(SSL_CTX_check_private_key(serverctx), 1))
 546         goto err;
 547
 548 #ifndef OPENSSL_NO_DH
 549     SSL_CTX_set_dh_auto(serverctx, 1);
 550 #endif
 551
 552     *sctx = serverctx;
 553     if (cctx != NULL)
 554         *cctx = clientctx;
 555     return 1;
 556
 557  err:
 558     SSL_CTX_free(serverctx);
 559     SSL_CTX_free(clientctx);
 560     return 0;
 561 }
 562
 563 #define MAXLOOPS    1000000
 564
 565 /*
 566  * NOTE: Transfers control of the BIOs - this function will free them on error
 567  */
 568 int create_ssl_objects(SSL_CTX *serverctx, SSL_CTX *clientctx, SSL **sssl,
 569                           SSL **cssl, BIO *s_to_c_fbio, BIO *c_to_s_fbio)
 570 {
 571     SSL *serverssl = NULL, *clientssl = NULL;
 572     BIO *s_to_c_bio = NULL, *c_to_s_bio = NULL;
 573
 574     if (*sssl != NULL)
 575         serverssl = *sssl;
 576     else if (!TEST_ptr(serverssl = SSL_new(serverctx)))
 577         goto error;
 578     if (*cssl != NULL)
 579         clientssl = *cssl;
 580     else if (!TEST_ptr(clientssl = SSL_new(clientctx)))
 581         goto error;
 582
 583     if (SSL_is_dtls(clientssl)) {
 584         if (!TEST_ptr(s_to_c_bio = BIO_new(bio_s_mempacket_test()))
 585                 || !TEST_ptr(c_to_s_bio = BIO_new(bio_s_mempacket_test())))
 586             goto error;
 587     } else {
 588         if (!TEST_ptr(s_to_c_bio = BIO_new(BIO_s_mem()))
 589                 || !TEST_ptr(c_to_s_bio = BIO_new(BIO_s_mem())))
 590             goto error;
 591     }
 592
 593     if (s_to_c_fbio != NULL
 594             && !TEST_ptr(s_to_c_bio = BIO_push(s_to_c_fbio, s_to_c_bio)))
 595         goto error;
 596     if (c_to_s_fbio != NULL
 597             && !TEST_ptr(c_to_s_bio = BIO_push(c_to_s_fbio, c_to_s_bio)))
 598         goto error;
 599
 600     /* Set Non-blocking IO behaviour */
 601     BIO_set_mem_eof_return(s_to_c_bio, -1);
 602     BIO_set_mem_eof_return(c_to_s_bio, -1);
 603
 604     /* Up ref these as we are passing them to two SSL objects */
 605     SSL_set_bio(serverssl, c_to_s_bio, s_to_c_bio);
 606     BIO_up_ref(s_to_c_bio);
 607     BIO_up_ref(c_to_s_bio);
 608     SSL_set_bio(clientssl, s_to_c_bio, c_to_s_bio);
 609     *sssl = serverssl;
 610     *cssl = clientssl;
 611     return 1;
 612
 613  error:
 614     SSL_free(serverssl);
 615     SSL_free(clientssl);
 616     BIO_free(s_to_c_bio);
 617     BIO_free(c_to_s_bio);
 618     BIO_free(s_to_c_fbio);
 619     BIO_free(c_to_s_fbio);
 620
 621     return 0;
 622 }
 623
 624 int create_ssl_connection(SSL *serverssl, SSL *clientssl, int want)
 625 {
 626     int retc = -1, rets = -1, err, abortctr = 0;
 627     int clienterr = 0, servererr = 0;
 628     unsigned char buf;
 629     size_t readbytes;
 630
 631     do {
 632         err = SSL_ERROR_WANT_WRITE;
 633         while (!clienterr && retc <= 0 && err == SSL_ERROR_WANT_WRITE) {
 634             retc = SSL_connect(clientssl);
 635             if (retc <= 0)
 636                 err = SSL_get_error(clientssl, retc);
 637         }
 638
 639         if (!clienterr && retc <= 0 && err != SSL_ERROR_WANT_READ) {
 640             TEST_info("SSL_connect() failed %d, %d", retc, err);
 641             clienterr = 1;
 642         }
 643         if (want != SSL_ERROR_NONE && err == want)
 644             return 0;
 645
 646         err = SSL_ERROR_WANT_WRITE;
 647         while (!servererr && rets <= 0 && err == SSL_ERROR_WANT_WRITE) {
 648             rets = SSL_accept(serverssl);
 649             if (rets <= 0)
 650                 err = SSL_get_error(serverssl, rets);
 651         }
 652
 653         if (!servererr && rets <= 0 && err != SSL_ERROR_WANT_READ) {
 654             TEST_info("SSL_accept() failed %d, %d", rets, err);
 655             servererr = 1;
 656         }
 657         if (want != SSL_ERROR_NONE && err == want)
 658             return 0;
 659         if (clienterr && servererr)
 660             return 0;
 661         if (++abortctr == MAXLOOPS) {
 662             TEST_info("No progress made");
 663             return 0;
 664         }
 665     } while (retc <=0 || rets <= 0);
 666
 667     /*
 668      * We attempt to read some data on the client side which we expect to fail.
 669      * This will ensure we have received the NewSessionTicket in TLSv1.3 where
 670      * appropriate.
 671      */
 672     if (SSL_read_ex(clientssl, &buf, sizeof(buf), &readbytes) > 0) {
 673         if (!TEST_ulong_eq(readbytes, 0))
 674             return 0;
 675     } else if (!TEST_int_eq(SSL_get_error(clientssl, 0), SSL_ERROR_WANT_READ)) {
 676         return 0;
 677     }
 678
 679     return 1;
 680 }
 681
 682 void shutdown_ssl_connection(SSL *serverssl, SSL *clientssl)
 683 {
 684     SSL_shutdown(clientssl);
 685     SSL_shutdown(serverssl);
 686     SSL_free(serverssl);
 687     SSL_free(clientssl);
 688 }