test/ssltestlib.c

   1 /*
   2  * Copyright 2016 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 "ssltestlib.h"
  13
  14 static int tls_dump_new(BIO *bi);
  15 static int tls_dump_free(BIO *a);
  16 static int tls_dump_read(BIO *b, char *out, int outl);
  17 static int tls_dump_write(BIO *b, const char *in, int inl);
  18 static long tls_dump_ctrl(BIO *b, int cmd, long num, void *ptr);
  19 static int tls_dump_gets(BIO *bp, char *buf, int size);
  20 static int tls_dump_puts(BIO *bp, const char *str);
  21
  22 /* Choose a sufficiently large type likely to be unused for this custom BIO */
  23 # define BIO_TYPE_TLS_DUMP_FILTER  (0x80 | BIO_TYPE_FILTER)
  24
  25 # define BIO_TYPE_MEMPACKET_TEST      0x81
  26
  27 static BIO_METHOD *method_tls_dump = NULL;
  28 static BIO_METHOD *method_mempacket_test = NULL;
  29
  30 /* Note: Not thread safe! */
  31 const BIO_METHOD *bio_f_tls_dump_filter(void)
  32 {
  33     if (method_tls_dump == NULL) {
  34         method_tls_dump = BIO_meth_new(BIO_TYPE_TLS_DUMP_FILTER,
  35                                         "TLS dump filter");
  36         if (   method_tls_dump == NULL
  37             || !BIO_meth_set_write(method_tls_dump, tls_dump_write)
  38             || !BIO_meth_set_read(method_tls_dump, tls_dump_read)
  39             || !BIO_meth_set_puts(method_tls_dump, tls_dump_puts)
  40             || !BIO_meth_set_gets(method_tls_dump, tls_dump_gets)
  41             || !BIO_meth_set_ctrl(method_tls_dump, tls_dump_ctrl)
  42             || !BIO_meth_set_create(method_tls_dump, tls_dump_new)
  43             || !BIO_meth_set_destroy(method_tls_dump, tls_dump_free))
  44             return NULL;
  45     }
  46     return method_tls_dump;
  47 }
  48
  49 void bio_f_tls_dump_filter_free(void)
  50 {
  51     BIO_meth_free(method_tls_dump);
  52 }
  53
  54 static int tls_dump_new(BIO *bio)
  55 {
  56     BIO_set_init(bio, 1);
  57     return 1;
  58 }
  59
  60 static int tls_dump_free(BIO *bio)
  61 {
  62     BIO_set_init(bio, 0);
  63
  64     return 1;
  65 }
  66
  67 static void copy_flags(BIO *bio)
  68 {
  69     int flags;
  70     BIO *next = BIO_next(bio);
  71
  72     flags = BIO_test_flags(next, BIO_FLAGS_SHOULD_RETRY | BIO_FLAGS_RWS);
  73     BIO_clear_flags(bio, BIO_FLAGS_SHOULD_RETRY | BIO_FLAGS_RWS);
  74     BIO_set_flags(bio, flags);
  75 }
  76
  77 #define RECORD_CONTENT_TYPE     0
  78 #define RECORD_VERSION_HI       1
  79 #define RECORD_VERSION_LO       2
  80 #define RECORD_EPOCH_HI         3
  81 #define RECORD_EPOCH_LO         4
  82 #define RECORD_SEQUENCE_START   5
  83 #define RECORD_SEQUENCE_END     10
  84 #define RECORD_LEN_HI           11
  85 #define RECORD_LEN_LO           12
  86
  87 #define MSG_TYPE                0
  88 #define MSG_LEN_HI              1
  89 #define MSG_LEN_MID             2
  90 #define MSG_LEN_LO              3
  91 #define MSG_SEQ_HI              4
  92 #define MSG_SEQ_LO              5
  93 #define MSG_FRAG_OFF_HI         6
  94 #define MSG_FRAG_OFF_MID        7
  95 #define MSG_FRAG_OFF_LO         8
  96 #define MSG_FRAG_LEN_HI         9
  97 #define MSG_FRAG_LEN_MID        10
  98 #define MSG_FRAG_LEN_LO         11
  99
 100
 101 static void dump_data(const char *data, int len)
 102 {
 103     int rem, i, content, reclen, msglen, fragoff, fraglen, epoch;
 104     unsigned char *rec;
 105
 106     printf("---- START OF PACKET ----\n");
 107
 108     rem = len;
 109     rec = (unsigned char *)data;
 110
 111     while (rem > 0) {
 112         if (rem != len)
 113             printf("*\n");
 114         printf("*---- START OF RECORD ----\n");
 115         if (rem < DTLS1_RT_HEADER_LENGTH) {
 116             printf("*---- RECORD TRUNCATED ----\n");
 117             break;
 118         }
 119         content = rec[RECORD_CONTENT_TYPE];
 120         printf("** Record Content-type: %d\n", content);
 121         printf("** Record Version: %02x%02x\n",
 122                rec[RECORD_VERSION_HI], rec[RECORD_VERSION_LO]);
 123         epoch = (rec[RECORD_EPOCH_HI] << 8) | rec[RECORD_EPOCH_LO];
 124         printf("** Record Epoch: %d\n", epoch);
 125         printf("** Record Sequence: ");
 126         for (i = RECORD_SEQUENCE_START; i <= RECORD_SEQUENCE_END; i++)
 127             printf("%02x", rec[i]);
 128         reclen = (rec[RECORD_LEN_HI] << 8) | rec[RECORD_LEN_LO];
 129         printf("\n** Record Length: %d\n", reclen);
 130
 131         /* Now look at message */
 132         rec += DTLS1_RT_HEADER_LENGTH;
 133         rem -= DTLS1_RT_HEADER_LENGTH;
 134         if (content == SSL3_RT_HANDSHAKE) {
 135             printf("**---- START OF HANDSHAKE MESSAGE FRAGMENT ----\n");
 136             if (epoch > 0) {
 137                 printf("**---- HANDSHAKE MESSAGE FRAGMENT ENCRYPTED ----\n");
 138             } else if (rem < DTLS1_HM_HEADER_LENGTH
 139                     || reclen < DTLS1_HM_HEADER_LENGTH) {
 140                 printf("**---- HANDSHAKE MESSAGE FRAGMENT TRUNCATED ----\n");
 141             } else {
 142                 printf("*** Message Type: %d\n", rec[MSG_TYPE]);
 143                 msglen = (rec[MSG_LEN_HI] << 16) | (rec[MSG_LEN_MID] << 8)
 144                          | rec[MSG_LEN_LO];
 145                 printf("*** Message Length: %d\n", msglen);
 146                 printf("*** Message sequence: %d\n",
 147                        (rec[MSG_SEQ_HI] << 8) | rec[MSG_SEQ_LO]);
 148                 fragoff = (rec[MSG_FRAG_OFF_HI] << 16)
 149                           | (rec[MSG_FRAG_OFF_MID] << 8)
 150                           | rec[MSG_FRAG_OFF_LO];
 151                 printf("*** Message Fragment offset: %d\n", fragoff);
 152                 fraglen = (rec[MSG_FRAG_LEN_HI] << 16)
 153                           | (rec[MSG_FRAG_LEN_MID] << 8)
 154                           | rec[MSG_FRAG_LEN_LO];
 155                 printf("*** Message Fragment len: %d\n", fraglen);
 156                 if (fragoff + fraglen > msglen)
 157                     printf("***---- HANDSHAKE MESSAGE FRAGMENT INVALID ----\n");
 158                 else if(reclen < fraglen)
 159                     printf("**---- HANDSHAKE MESSAGE FRAGMENT TRUNCATED ----\n");
 160                 else
 161                     printf("**---- END OF HANDSHAKE MESSAGE FRAGMENT ----\n");
 162             }
 163         }
 164         if (rem < reclen) {
 165             printf("*---- RECORD TRUNCATED ----\n");
 166             rem = 0;
 167         } else {
 168             rec += reclen;
 169             rem -= reclen;
 170             printf("*---- END OF RECORD ----\n");
 171         }
 172     }
 173     printf("---- END OF PACKET ----\n\n");
 174     fflush(stdout);
 175 }
 176
 177 static int tls_dump_read(BIO *bio, char *out, int outl)
 178 {
 179     int ret;
 180     BIO *next = BIO_next(bio);
 181
 182     ret = BIO_read(next, out, outl);
 183     copy_flags(bio);
 184
 185     if (ret > 0) {
 186         dump_data(out, ret);
 187     }
 188
 189     return ret;
 190 }
 191
 192 static int tls_dump_write(BIO *bio, const char *in, int inl)
 193 {
 194     int ret;
 195     BIO *next = BIO_next(bio);
 196
 197     ret = BIO_write(next, in, inl);
 198     copy_flags(bio);
 199
 200     return ret;
 201 }
 202
 203 static long tls_dump_ctrl(BIO *bio, int cmd, long num, void *ptr)
 204 {
 205     long ret;
 206     BIO *next = BIO_next(bio);
 207
 208     if (next == NULL)
 209         return 0;
 210
 211     switch (cmd) {
 212     case BIO_CTRL_DUP:
 213         ret = 0L;
 214         break;
 215     default:
 216         ret = BIO_ctrl(next, cmd, num, ptr);
 217         break;
 218     }
 219     return ret;
 220 }
 221
 222 static int tls_dump_gets(BIO *bio, char *buf, int size)
 223 {
 224     /* We don't support this - not needed anyway */
 225     return -1;
 226 }
 227
 228 static int tls_dump_puts(BIO *bio, const char *str)
 229 {
 230     return tls_dump_write(bio, str, strlen(str));
 231 }
 232
 233
 234 typedef struct mempacket_st {
 235     unsigned char *data;
 236     int len;
 237     unsigned int num;
 238     unsigned int type;
 239 } MEMPACKET;
 240
 241 DEFINE_STACK_OF(MEMPACKET)
 242
 243 static void mempacket_free(MEMPACKET *pkt)
 244 {
 245     if (pkt->data != NULL)
 246         OPENSSL_free(pkt->data);
 247     OPENSSL_free(pkt);
 248 }
 249
 250 typedef struct mempacket_test_ctx_st {
 251     STACK_OF(MEMPACKET) *pkts;
 252     unsigned int epoch;
 253     unsigned int currrec;
 254     unsigned int currpkt;
 255     unsigned int lastpkt;
 256     unsigned int noinject;
 257 } MEMPACKET_TEST_CTX;
 258
 259 static int mempacket_test_new(BIO *bi);
 260 static int mempacket_test_free(BIO *a);
 261 static int mempacket_test_read(BIO *b, char *out, int outl);
 262 static int mempacket_test_write(BIO *b, const char *in, int inl);
 263 static long mempacket_test_ctrl(BIO *b, int cmd, long num, void *ptr);
 264 static int mempacket_test_gets(BIO *bp, char *buf, int size);
 265 static int mempacket_test_puts(BIO *bp, const char *str);
 266
 267 const BIO_METHOD *bio_s_mempacket_test(void)
 268 {
 269     if (method_mempacket_test == NULL) {
 270         method_mempacket_test = BIO_meth_new(BIO_TYPE_MEMPACKET_TEST,
 271                                              "Mem Packet Test");
 272         if (   method_mempacket_test == NULL
 273             || !BIO_meth_set_write(method_mempacket_test, mempacket_test_write)
 274             || !BIO_meth_set_read(method_mempacket_test, mempacket_test_read)
 275             || !BIO_meth_set_puts(method_mempacket_test, mempacket_test_puts)
 276             || !BIO_meth_set_gets(method_mempacket_test, mempacket_test_gets)
 277             || !BIO_meth_set_ctrl(method_mempacket_test, mempacket_test_ctrl)
 278             || !BIO_meth_set_create(method_mempacket_test, mempacket_test_new)
 279             || !BIO_meth_set_destroy(method_mempacket_test, mempacket_test_free))
 280             return NULL;
 281     }
 282     return method_mempacket_test;
 283 }
 284
 285 void bio_s_mempacket_test_free(void)
 286 {
 287     BIO_meth_free(method_mempacket_test);
 288 }
 289
 290 static int mempacket_test_new(BIO *bio)
 291 {
 292     MEMPACKET_TEST_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx));
 293     if (ctx == NULL)
 294         return 0;
 295     ctx->pkts = sk_MEMPACKET_new_null();
 296     if (ctx->pkts == NULL) {
 297         OPENSSL_free(ctx);
 298         return 0;
 299     }
 300     BIO_set_init(bio, 1);
 301     BIO_set_data(bio, ctx);
 302     return 1;
 303 }
 304
 305 static int mempacket_test_free(BIO *bio)
 306 {
 307     MEMPACKET_TEST_CTX *ctx = BIO_get_data(bio);
 308
 309     sk_MEMPACKET_pop_free(ctx->pkts, mempacket_free);
 310     OPENSSL_free(ctx);
 311     BIO_set_data(bio, NULL);
 312     BIO_set_init(bio, 0);
 313
 314     return 1;
 315 }
 316
 317 /* Record Header values */
 318 #define EPOCH_HI        4
 319 #define EPOCH_LO        5
 320 #define RECORD_SEQUENCE 10
 321 #define RECORD_LEN_HI   11
 322 #define RECORD_LEN_LO   12
 323
 324 #define STANDARD_PACKET                 0
 325
 326 static int mempacket_test_read(BIO *bio, char *out, int outl)
 327 {
 328     MEMPACKET_TEST_CTX *ctx = BIO_get_data(bio);
 329     MEMPACKET *thispkt;
 330     unsigned char *rec;
 331     int rem;
 332     unsigned int seq, offset, len, epoch;
 333
 334     BIO_clear_retry_flags(bio);
 335
 336     thispkt = sk_MEMPACKET_value(ctx->pkts, 0);
 337     if (thispkt == NULL || thispkt->num != ctx->currpkt) {
 338         /* Probably run out of data */
 339         BIO_set_retry_read(bio);
 340         return -1;
 341     }
 342     sk_MEMPACKET_shift(ctx->pkts);
 343     ctx->currpkt++;
 344
 345     if (outl > thispkt->len)
 346         outl = thispkt->len;
 347
 348     if (thispkt->type != INJECT_PACKET_IGNORE_REC_SEQ) {
 349         /*
 350          * Overwrite the record sequence number. We strictly number them in
 351          * the order received. Since we are actually a reliable transport
 352          * we know that there won't be any re-ordering. We overwrite to deal
 353          * with any packets that have been injected
 354          */
 355         rem = thispkt->len;
 356         rec = thispkt->data;
 357         while (rem > 0) {
 358             if (rem < DTLS1_RT_HEADER_LENGTH) {
 359                 return -1;
 360             }
 361             epoch = (rec[EPOCH_HI] << 8) | rec[EPOCH_LO];
 362             if (epoch != ctx->epoch) {
 363                 ctx->epoch = epoch;
 364                 ctx->currrec = 0;
 365             }
 366             seq = ctx->currrec;
 367             offset = 0;
 368             do {
 369                 rec[RECORD_SEQUENCE - offset] = seq & 0xFF;
 370                 seq >>= 8;
 371                 offset++;
 372             } while (seq > 0);
 373             ctx->currrec++;
 374
 375             len = ((rec[RECORD_LEN_HI] << 8) | rec[RECORD_LEN_LO])
 376                   + DTLS1_RT_HEADER_LENGTH;
 377
 378             rec += len;
 379             rem -= len;
 380         }
 381     }
 382
 383     memcpy(out, thispkt->data, outl);
 384
 385     mempacket_free(thispkt);
 386
 387     return outl;
 388 }
 389
 390 int mempacket_test_inject(BIO *bio, const char *in, int inl, int pktnum,
 391                           int type)
 392 {
 393     MEMPACKET_TEST_CTX *ctx = BIO_get_data(bio);
 394     MEMPACKET *thispkt, *looppkt, *nextpkt;
 395     int i;
 396
 397     if (ctx == NULL)
 398         return -1;
 399
 400     /* We only allow injection before we've started writing any data */
 401     if (pktnum >= 0) {
 402         if (ctx->noinject)
 403             return -1;
 404     } else {
 405         ctx->noinject = 1;
 406     }
 407
 408     thispkt = OPENSSL_malloc(sizeof(MEMPACKET));
 409     if (thispkt == NULL)
 410         return -1;
 411
 412     thispkt->data = OPENSSL_malloc(inl);
 413     if (thispkt->data == NULL) {
 414         mempacket_free(thispkt);
 415         return -1;
 416     }
 417
 418     memcpy(thispkt->data, in, inl);
 419     thispkt->len = inl;
 420     thispkt->num = (pktnum >= 0) ? (unsigned int)pktnum : ctx->lastpkt;
 421     thispkt->type = type;
 422
 423     for(i = 0; (looppkt = sk_MEMPACKET_value(ctx->pkts, i)) != NULL; i++) {
 424         /* Check if we found the right place to insert this packet */
 425         if (looppkt->num > thispkt->num) {
 426             if (sk_MEMPACKET_insert(ctx->pkts, thispkt, i) == 0) {
 427                 mempacket_free(thispkt);
 428                 return -1;
 429             }
 430             /* If we're doing up front injection then we're done */
 431             if (pktnum >= 0)
 432                 return inl;
 433             /*
 434              * We need to do some accounting on lastpkt. We increment it first,
 435              * but it might now equal the value of injected packets, so we need
 436              * to skip over those
 437              */
 438             ctx->lastpkt++;
 439             do {
 440                 i++;
 441                 nextpkt = sk_MEMPACKET_value(ctx->pkts, i);
 442                 if (nextpkt != NULL && nextpkt->num == ctx->lastpkt)
 443                     ctx->lastpkt++;
 444                 else
 445                     return inl;
 446             } while(1);
 447         } else if(looppkt->num == thispkt->num) {
 448             if (!ctx->noinject) {
 449                 /* We injected two packets with the same packet number! */
 450                 return -1;
 451             }
 452             ctx->lastpkt++;
 453             thispkt->num++;
 454         }
 455     }
 456     /*
 457      * We didn't find any packets with a packet number equal to or greater than
 458      * this one, so we just add it onto the end
 459      */
 460     if (!sk_MEMPACKET_push(ctx->pkts, thispkt)) {
 461         mempacket_free(thispkt);
 462         return -1;
 463     }
 464
 465     if (pktnum < 0)
 466         ctx->lastpkt++;
 467
 468     return inl;
 469 }
 470
 471 static int mempacket_test_write(BIO *bio, const char *in, int inl)
 472 {
 473     return mempacket_test_inject(bio, in, inl, -1, STANDARD_PACKET);
 474 }
 475
 476 static long mempacket_test_ctrl(BIO *bio, int cmd, long num, void *ptr)
 477 {
 478     long ret = 1;
 479     MEMPACKET_TEST_CTX *ctx = BIO_get_data(bio);
 480     MEMPACKET *thispkt;
 481
 482     switch (cmd) {
 483     case BIO_CTRL_EOF:
 484         ret = (long)(sk_MEMPACKET_num(ctx->pkts) == 0);
 485         break;
 486     case BIO_CTRL_GET_CLOSE:
 487         ret = BIO_get_shutdown(bio);
 488         break;
 489     case BIO_CTRL_SET_CLOSE:
 490         BIO_set_shutdown(bio, (int)num);
 491         break;
 492     case BIO_CTRL_WPENDING:
 493         ret = 0L;
 494         break;
 495     case BIO_CTRL_PENDING:
 496         thispkt = sk_MEMPACKET_value(ctx->pkts, 0);
 497         if (thispkt == NULL)
 498             ret = 0;
 499         else
 500             ret = thispkt->len;
 501         break;
 502     case BIO_CTRL_FLUSH:
 503         ret = 1;
 504         break;
 505     case BIO_CTRL_RESET:
 506     case BIO_CTRL_DUP:
 507     case BIO_CTRL_PUSH:
 508     case BIO_CTRL_POP:
 509     default:
 510         ret = 0;
 511         break;
 512     }
 513     return ret;
 514 }
 515
 516 static int mempacket_test_gets(BIO *bio, char *buf, int size)
 517 {
 518     /* We don't support this - not needed anyway */
 519     return -1;
 520 }
 521
 522 static int mempacket_test_puts(BIO *bio, const char *str)
 523 {
 524     return mempacket_test_write(bio, str, strlen(str));
 525 }
 526
 527 int create_ssl_ctx_pair(const SSL_METHOD *sm, const SSL_METHOD *cm,
 528                         SSL_CTX **sctx, SSL_CTX **cctx, char *certfile,
 529                         char *privkeyfile)
 530 {
 531     SSL_CTX *serverctx = NULL;
 532     SSL_CTX *clientctx = NULL;
 533
 534     serverctx = SSL_CTX_new(sm);
 535     clientctx = SSL_CTX_new(cm);
 536     if (serverctx == NULL || clientctx == NULL) {
 537         printf("Failed to create SSL_CTX\n");
 538         goto err;
 539     }
 540
 541     if (SSL_CTX_use_certificate_file(serverctx, certfile,
 542                                      SSL_FILETYPE_PEM) <= 0) {
 543         printf("Failed to load server certificate\n");
 544         goto err;
 545     }
 546     if (SSL_CTX_use_PrivateKey_file(serverctx, privkeyfile,
 547                                     SSL_FILETYPE_PEM) <= 0) {
 548         printf("Failed to load server private key\n");
 549     }
 550     if (SSL_CTX_check_private_key(serverctx) <= 0) {
 551         printf("Failed to check private key\n");
 552         goto err;
 553     }
 554
 555     *sctx = serverctx;
 556     *cctx = clientctx;
 557
 558     return 1;
 559  err:
 560     SSL_CTX_free(serverctx);
 561     SSL_CTX_free(clientctx);
 562     return 0;
 563 }
 564
 565 #define MAXLOOPS    100000
 566
 567 /*
 568  * NOTE: Transfers control of the BIOs - this function will free them on error
 569  */
 570 int create_ssl_connection(SSL_CTX *serverctx, SSL_CTX *clientctx, SSL **sssl,
 571                           SSL **cssl, BIO *s_to_c_fbio, BIO *c_to_s_fbio)
 572 {
 573     int retc = -1, rets = -1, err, abortctr = 0;
 574     int clienterr = 0, servererr = 0;
 575     SSL *serverssl, *clientssl;
 576     BIO *s_to_c_bio = NULL, *c_to_s_bio = NULL;
 577
 578     if (*sssl == NULL)
 579         serverssl = SSL_new(serverctx);
 580     else
 581         serverssl = *sssl;
 582     if (*cssl == NULL)
 583         clientssl = SSL_new(clientctx);
 584     else
 585         clientssl = *cssl;
 586
 587     if (serverssl == NULL || clientssl == NULL) {
 588         printf("Failed to create SSL object\n");
 589         goto error;
 590     }
 591
 592     s_to_c_bio = BIO_new(BIO_s_mem());
 593     c_to_s_bio = BIO_new(BIO_s_mem());
 594     if (s_to_c_bio == NULL || c_to_s_bio == NULL) {
 595         printf("Failed to create mem BIOs\n");
 596         goto error;
 597     }
 598
 599     if (s_to_c_fbio != NULL)
 600         s_to_c_bio = BIO_push(s_to_c_fbio, s_to_c_bio);
 601     if (c_to_s_fbio != NULL)
 602         c_to_s_bio = BIO_push(c_to_s_fbio, c_to_s_bio);
 603     if (s_to_c_bio == NULL || c_to_s_bio == NULL) {
 604         printf("Failed to create chained BIOs\n");
 605         goto error;
 606     }
 607
 608     /* Set Non-blocking IO behaviour */
 609     BIO_set_mem_eof_return(s_to_c_bio, -1);
 610     BIO_set_mem_eof_return(c_to_s_bio, -1);
 611
 612     /* Up ref these as we are passing them to two SSL objects */
 613     BIO_up_ref(s_to_c_bio);
 614     BIO_up_ref(c_to_s_bio);
 615
 616     SSL_set_bio(serverssl, c_to_s_bio, s_to_c_bio);
 617     SSL_set_bio(clientssl, s_to_c_bio, c_to_s_bio);
 618
 619     /* BIOs will now be freed when SSL objects are freed */
 620     s_to_c_bio = c_to_s_bio = NULL;
 621     s_to_c_fbio = c_to_s_fbio = NULL;
 622
 623     do {
 624         err = SSL_ERROR_WANT_WRITE;
 625         while (!clienterr && retc <= 0 && err == SSL_ERROR_WANT_WRITE) {
 626             retc = SSL_connect(clientssl);
 627             if (retc <= 0)
 628                 err = SSL_get_error(clientssl, retc);
 629         }
 630
 631         if (!clienterr && retc <= 0 && err != SSL_ERROR_WANT_READ) {
 632             printf("SSL_connect() failed %d, %d\n", retc, err);
 633             clienterr = 1;
 634         }
 635
 636         err = SSL_ERROR_WANT_WRITE;
 637         while (!servererr && rets <= 0 && err == SSL_ERROR_WANT_WRITE) {
 638             rets = SSL_accept(serverssl);
 639             if (rets <= 0)
 640                 err = SSL_get_error(serverssl, rets);
 641         }
 642
 643         if (!servererr && rets <= 0 && err != SSL_ERROR_WANT_READ) {
 644             printf("SSL_accept() failed %d, %d\n", retc, err);
 645             servererr = 1;
 646         }
 647         if (clienterr && servererr)
 648             goto error;
 649         if (++abortctr == MAXLOOPS) {
 650             printf("No progress made\n");
 651             goto error;
 652         }
 653     } while (retc <=0 || rets <= 0);
 654
 655     *sssl = serverssl;
 656     *cssl = clientssl;
 657
 658     return 1;
 659
 660  error:
 661     if (*sssl == NULL) {
 662         SSL_free(serverssl);
 663         BIO_free(s_to_c_bio);
 664         BIO_free(s_to_c_fbio);
 665     }
 666     if (*cssl == NULL) {
 667         SSL_free(clientssl);
 668         BIO_free(c_to_s_bio);
 669         BIO_free(c_to_s_fbio);
 670     }
 671
 672     return 0;
 673 }