test/handshake_helper.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 <openssl/bio.h>
  13 #include <openssl/x509_vfy.h>
  14 #include <openssl/ssl.h>
  15
  16 #include "handshake_helper.h"
  17
  18 HANDSHAKE_RESULT *HANDSHAKE_RESULT_new()
  19 {
  20     HANDSHAKE_RESULT *ret;
  21     ret = OPENSSL_zalloc(sizeof(*ret));
  22     OPENSSL_assert(ret != NULL);
  23     return ret;
  24 }
  25
  26 void HANDSHAKE_RESULT_free(HANDSHAKE_RESULT *result)
  27 {
  28     OPENSSL_free(result->client_npn_negotiated);
  29     OPENSSL_free(result->server_npn_negotiated);
  30     OPENSSL_free(result->client_alpn_negotiated);
  31     OPENSSL_free(result->server_alpn_negotiated);
  32     OPENSSL_free(result);
  33 }
  34
  35 /*
  36  * Since there appears to be no way to extract the sent/received alert
  37  * from the SSL object directly, we use the info callback and stash
  38  * the result in ex_data.
  39  */
  40 typedef struct handshake_ex_data {
  41     int alert_sent;
  42     int alert_received;
  43     int session_ticket_do_not_call;
  44     ssl_servername_t servername;
  45 } HANDSHAKE_EX_DATA;
  46
  47 typedef struct ctx_data {
  48     unsigned char *npn_protocols;
  49     size_t npn_protocols_len;
  50     unsigned char *alpn_protocols;
  51     size_t alpn_protocols_len;
  52 } CTX_DATA;
  53
  54 /* |ctx_data| itself is stack-allocated. */
  55 static void ctx_data_free_data(CTX_DATA *ctx_data)
  56 {
  57     OPENSSL_free(ctx_data->npn_protocols);
  58     ctx_data->npn_protocols = NULL;
  59     OPENSSL_free(ctx_data->alpn_protocols);
  60     ctx_data->alpn_protocols = NULL;
  61 }
  62
  63 static int ex_data_idx;
  64
  65 static void info_cb(const SSL *s, int where, int ret)
  66 {
  67     if (where & SSL_CB_ALERT) {
  68         HANDSHAKE_EX_DATA *ex_data =
  69             (HANDSHAKE_EX_DATA*)(SSL_get_ex_data(s, ex_data_idx));
  70         if (where & SSL_CB_WRITE) {
  71             ex_data->alert_sent = ret;
  72         } else {
  73             ex_data->alert_received = ret;
  74         }
  75     }
  76 }
  77
  78 /* Select the appropriate server CTX.
  79  * Returns SSL_TLSEXT_ERR_OK if a match was found.
  80  * If |ignore| is 1, returns SSL_TLSEXT_ERR_NOACK on mismatch.
  81  * Otherwise, returns SSL_TLSEXT_ERR_ALERT_FATAL on mismatch.
  82  * An empty SNI extension also returns SSL_TSLEXT_ERR_NOACK.
  83  */
  84 static int select_server_ctx(SSL *s, void *arg, int ignore)
  85 {
  86     const char *servername = SSL_get_servername(s, TLSEXT_NAMETYPE_host_name);
  87     HANDSHAKE_EX_DATA *ex_data =
  88         (HANDSHAKE_EX_DATA*)(SSL_get_ex_data(s, ex_data_idx));
  89
  90     if (servername == NULL) {
  91         ex_data->servername = SSL_TEST_SERVERNAME_SERVER1;
  92         return SSL_TLSEXT_ERR_NOACK;
  93     }
  94
  95     if (strcmp(servername, "server2") == 0) {
  96         SSL_CTX *new_ctx = (SSL_CTX*)arg;
  97         SSL_set_SSL_CTX(s, new_ctx);
  98         /*
  99          * Copy over all the SSL_CTX options - reasonable behavior
 100          * allows testing of cases where the options between two
 101          * contexts differ/conflict
 102          */
 103         SSL_clear_options(s, 0xFFFFFFFFL);
 104         SSL_set_options(s, SSL_CTX_get_options(new_ctx));
 105
 106         ex_data->servername = SSL_TEST_SERVERNAME_SERVER2;
 107         return SSL_TLSEXT_ERR_OK;
 108     } else if (strcmp(servername, "server1") == 0) {
 109         ex_data->servername = SSL_TEST_SERVERNAME_SERVER1;
 110         return SSL_TLSEXT_ERR_OK;
 111     } else if (ignore) {
 112         ex_data->servername = SSL_TEST_SERVERNAME_SERVER1;
 113         return SSL_TLSEXT_ERR_NOACK;
 114     } else {
 115         /* Don't set an explicit alert, to test library defaults. */
 116         return SSL_TLSEXT_ERR_ALERT_FATAL;
 117     }
 118 }
 119
 120 /*
 121  * (RFC 6066):
 122  *  If the server understood the ClientHello extension but
 123  *  does not recognize the server name, the server SHOULD take one of two
 124  *  actions: either abort the handshake by sending a fatal-level
 125  *  unrecognized_name(112) alert or continue the handshake.
 126  *
 127  * This behaviour is up to the application to configure; we test both
 128  * configurations to ensure the state machine propagates the result
 129  * correctly.
 130  */
 131 static int servername_ignore_cb(SSL *s, int *ad, void *arg)
 132 {
 133     return select_server_ctx(s, arg, 1);
 134 }
 135
 136 static int servername_reject_cb(SSL *s, int *ad, void *arg)
 137 {
 138     return select_server_ctx(s, arg, 0);
 139 }
 140
 141 static int verify_reject_cb(X509_STORE_CTX *ctx, void *arg) {
 142     X509_STORE_CTX_set_error(ctx, X509_V_ERR_APPLICATION_VERIFICATION);
 143     return 0;
 144 }
 145
 146 static int verify_accept_cb(X509_STORE_CTX *ctx, void *arg) {
 147     return 1;
 148 }
 149
 150 static int broken_session_ticket_cb(SSL *s, unsigned char *key_name, unsigned char *iv,
 151                                     EVP_CIPHER_CTX *ctx, HMAC_CTX *hctx, int enc)
 152 {
 153     return 0;
 154 }
 155
 156 static int do_not_call_session_ticket_cb(SSL *s, unsigned char *key_name,
 157                                          unsigned char *iv,
 158                                          EVP_CIPHER_CTX *ctx,
 159                                          HMAC_CTX *hctx, int enc)
 160 {
 161     HANDSHAKE_EX_DATA *ex_data =
 162         (HANDSHAKE_EX_DATA*)(SSL_get_ex_data(s, ex_data_idx));
 163     ex_data->session_ticket_do_not_call = 1;
 164     return 0;
 165 }
 166
 167 /* Parse the comma-separated list into TLS format. */
 168 static void parse_protos(const char *protos, unsigned char **out, size_t *outlen)
 169 {
 170     size_t len, i, prefix;
 171
 172     len = strlen(protos);
 173
 174     /* Should never have reuse. */
 175     OPENSSL_assert(*out == NULL);
 176
 177     /* Test values are small, so we omit length limit checks. */
 178     *out = OPENSSL_malloc(len + 1);
 179     OPENSSL_assert(*out != NULL);
 180     *outlen = len + 1;
 181
 182     /*
 183      * foo => '3', 'f', 'o', 'o'
 184      * foo,bar => '3', 'f', 'o', 'o', '3', 'b', 'a', 'r'
 185      */
 186     memcpy(*out + 1, protos, len);
 187
 188     prefix = 0;
 189     i = prefix + 1;
 190     while (i <= len) {
 191         if ((*out)[i] == ',') {
 192             OPENSSL_assert(i - 1 - prefix > 0);
 193             (*out)[prefix] = i - 1 - prefix;
 194             prefix = i;
 195         }
 196         i++;
 197     }
 198     OPENSSL_assert(len - prefix > 0);
 199     (*out)[prefix] = len - prefix;
 200 }
 201
 202 /*
 203  * The client SHOULD select the first protocol advertised by the server that it
 204  * also supports.  In the event that the client doesn't support any of server's
 205  * protocols, or the server doesn't advertise any, it SHOULD select the first
 206  * protocol that it supports.
 207  */
 208 static int client_npn_cb(SSL *s, unsigned char **out, unsigned char *outlen,
 209                          const unsigned char *in, unsigned int inlen,
 210                          void *arg)
 211 {
 212     CTX_DATA *ctx_data = (CTX_DATA*)(arg);
 213     int ret;
 214
 215     ret = SSL_select_next_proto(out, outlen, in, inlen,
 216                                 ctx_data->npn_protocols,
 217                                 ctx_data->npn_protocols_len);
 218     /* Accept both OPENSSL_NPN_NEGOTIATED and OPENSSL_NPN_NO_OVERLAP. */
 219     OPENSSL_assert(ret == OPENSSL_NPN_NEGOTIATED
 220                    || ret == OPENSSL_NPN_NO_OVERLAP);
 221     return SSL_TLSEXT_ERR_OK;
 222 }
 223
 224 static int server_npn_cb(SSL *s, const unsigned char **data,
 225                          unsigned int *len, void *arg)
 226 {
 227     CTX_DATA *ctx_data = (CTX_DATA*)(arg);
 228     *data = ctx_data->npn_protocols;
 229     *len = ctx_data->npn_protocols_len;
 230     return SSL_TLSEXT_ERR_OK;
 231 }
 232
 233 /*
 234  * The server SHOULD select the most highly preferred protocol that it supports
 235  * and that is also advertised by the client.  In the event that the server
 236  * supports no protocols that the client advertises, then the server SHALL
 237  * respond with a fatal "no_application_protocol" alert.
 238  */
 239 static int server_alpn_cb(SSL *s, const unsigned char **out,
 240                           unsigned char *outlen, const unsigned char *in,
 241                           unsigned int inlen, void *arg)
 242 {
 243     CTX_DATA *ctx_data = (CTX_DATA*)(arg);
 244     int ret;
 245
 246     /* SSL_select_next_proto isn't const-correct... */
 247     unsigned char *tmp_out;
 248
 249     /*
 250      * The result points either to |in| or to |ctx_data->alpn_protocols|.
 251      * The callback is allowed to point to |in| or to a long-lived buffer,
 252      * so we can return directly without storing a copy.
 253      */
 254     ret = SSL_select_next_proto(&tmp_out, outlen,
 255                                 ctx_data->alpn_protocols,
 256                                 ctx_data->alpn_protocols_len, in, inlen);
 257
 258     *out = tmp_out;
 259     /* Unlike NPN, we don't tolerate a mismatch. */
 260     return ret == OPENSSL_NPN_NEGOTIATED ? SSL_TLSEXT_ERR_OK
 261         : SSL_TLSEXT_ERR_NOACK;
 262 }
 263
 264
 265 /*
 266  * Configure callbacks and other properties that can't be set directly
 267  * in the server/client CONF.
 268  */
 269 static void configure_handshake_ctx(SSL_CTX *server_ctx, SSL_CTX *server2_ctx,
 270                                     SSL_CTX *client_ctx,
 271                                     const SSL_TEST_CTX *test_ctx,
 272                                     CTX_DATA *server_ctx_data,
 273                                     CTX_DATA *server2_ctx_data,
 274                                     CTX_DATA *client_ctx_data)
 275 {
 276     unsigned char *ticket_keys;
 277     size_t ticket_key_len;
 278
 279     switch (test_ctx->client_verify_callback) {
 280     case SSL_TEST_VERIFY_ACCEPT_ALL:
 281         SSL_CTX_set_cert_verify_callback(client_ctx, &verify_accept_cb,
 282                                          NULL);
 283         break;
 284     case SSL_TEST_VERIFY_REJECT_ALL:
 285         SSL_CTX_set_cert_verify_callback(client_ctx, &verify_reject_cb,
 286                                          NULL);
 287         break;
 288     default:
 289         break;
 290     }
 291
 292     /* link the two contexts for SNI purposes */
 293     switch (test_ctx->servername_callback) {
 294     case SSL_TEST_SERVERNAME_IGNORE_MISMATCH:
 295         SSL_CTX_set_tlsext_servername_callback(server_ctx, servername_ignore_cb);
 296         SSL_CTX_set_tlsext_servername_arg(server_ctx, server2_ctx);
 297         break;
 298     case SSL_TEST_SERVERNAME_REJECT_MISMATCH:
 299         SSL_CTX_set_tlsext_servername_callback(server_ctx, servername_reject_cb);
 300         SSL_CTX_set_tlsext_servername_arg(server_ctx, server2_ctx);
 301         break;
 302     default:
 303         break;
 304     }
 305
 306     /*
 307      * The initial_ctx/session_ctx always handles the encrypt/decrypt of the
 308      * session ticket. This ticket_key callback is assigned to the second
 309      * session (assigned via SNI), and should never be invoked
 310      */
 311     if (server2_ctx != NULL)
 312         SSL_CTX_set_tlsext_ticket_key_cb(server2_ctx,
 313                                          do_not_call_session_ticket_cb);
 314
 315     if (test_ctx->session_ticket_expected == SSL_TEST_SESSION_TICKET_BROKEN) {
 316         SSL_CTX_set_tlsext_ticket_key_cb(server_ctx, broken_session_ticket_cb);
 317     }
 318     if (test_ctx->server_npn_protocols != NULL) {
 319         parse_protos(test_ctx->server_npn_protocols,
 320                      &server_ctx_data->npn_protocols,
 321                      &server_ctx_data->npn_protocols_len);
 322         SSL_CTX_set_next_protos_advertised_cb(server_ctx, server_npn_cb,
 323                                               server_ctx_data);
 324     }
 325     if (test_ctx->server2_npn_protocols != NULL) {
 326         parse_protos(test_ctx->server2_npn_protocols,
 327                      &server2_ctx_data->npn_protocols,
 328                      &server2_ctx_data->npn_protocols_len);
 329         OPENSSL_assert(server2_ctx != NULL);
 330         SSL_CTX_set_next_protos_advertised_cb(server2_ctx, server_npn_cb,
 331                                               server2_ctx_data);
 332     }
 333     if (test_ctx->client_npn_protocols != NULL) {
 334         parse_protos(test_ctx->client_npn_protocols,
 335                      &client_ctx_data->npn_protocols,
 336                      &client_ctx_data->npn_protocols_len);
 337         SSL_CTX_set_next_proto_select_cb(client_ctx, client_npn_cb,
 338                                          client_ctx_data);
 339     }
 340     if (test_ctx->server_alpn_protocols != NULL) {
 341         parse_protos(test_ctx->server_alpn_protocols,
 342                      &server_ctx_data->alpn_protocols,
 343                      &server_ctx_data->alpn_protocols_len);
 344         SSL_CTX_set_alpn_select_cb(server_ctx, server_alpn_cb, server_ctx_data);
 345     }
 346     if (test_ctx->server2_alpn_protocols != NULL) {
 347         OPENSSL_assert(server2_ctx != NULL);
 348         parse_protos(test_ctx->server2_alpn_protocols,
 349                      &server2_ctx_data->alpn_protocols,
 350                      &server2_ctx_data->alpn_protocols_len);
 351         SSL_CTX_set_alpn_select_cb(server2_ctx, server_alpn_cb, server2_ctx_data);
 352     }
 353     if (test_ctx->client_alpn_protocols != NULL) {
 354         unsigned char *alpn_protos = NULL;
 355         size_t alpn_protos_len;
 356         parse_protos(test_ctx->client_alpn_protocols,
 357                      &alpn_protos, &alpn_protos_len);
 358         /* Reversed return value convention... */
 359         OPENSSL_assert(SSL_CTX_set_alpn_protos(client_ctx, alpn_protos,
 360                                                alpn_protos_len) == 0);
 361         OPENSSL_free(alpn_protos);
 362     }
 363     /*
 364      * Use fixed session ticket keys so that we can decrypt a ticket created with
 365      * one CTX in another CTX. Don't address server2 for the moment.
 366      */
 367     ticket_key_len = SSL_CTX_set_tlsext_ticket_keys(server_ctx, NULL, 0);
 368     ticket_keys = OPENSSL_zalloc(ticket_key_len);
 369     OPENSSL_assert(ticket_keys != NULL);
 370     OPENSSL_assert(SSL_CTX_set_tlsext_ticket_keys(server_ctx, ticket_keys,
 371                                                   ticket_key_len) == 1);
 372     OPENSSL_free(ticket_keys);
 373 }
 374
 375 /* Configure per-SSL callbacks and other properties. */
 376 static void configure_handshake_ssl(SSL *server, SSL *client,
 377                                     const SSL_TEST_CTX *test_ctx)
 378 {
 379     if (test_ctx->servername != SSL_TEST_SERVERNAME_NONE)
 380         SSL_set_tlsext_host_name(client,
 381                                  ssl_servername_name(test_ctx->servername));
 382 }
 383
 384
 385 typedef enum {
 386     PEER_SUCCESS,
 387     PEER_RETRY,
 388     PEER_ERROR
 389 } peer_status_t;
 390
 391 /*
 392  * RFC 5246 says:
 393  *
 394  * Note that as of TLS 1.1,
 395  *     failure to properly close a connection no longer requires that a
 396  *     session not be resumed.  This is a change from TLS 1.0 to conform
 397  *     with widespread implementation practice.
 398  *
 399  * However,
 400  * (a) OpenSSL requires that a connection be shutdown for all protocol versions.
 401  * (b) We test lower versions, too.
 402  * So we just implement shutdown. We do a full bidirectional shutdown so that we
 403  * can compare sent and received close_notify alerts and get some test coverage
 404  * for SSL_shutdown as a bonus.
 405  */
 406 static peer_status_t do_handshake_step(SSL *ssl, int shutdown)
 407 {
 408     int ret;
 409
 410     ret = shutdown ? SSL_shutdown(ssl) : SSL_do_handshake(ssl);
 411
 412     if (ret == 1) {
 413         return PEER_SUCCESS;
 414     } else if (ret == 0) {
 415         return shutdown ? PEER_RETRY : PEER_ERROR;
 416     } else {
 417         int error = SSL_get_error(ssl, ret);
 418         /* Memory bios should never block with SSL_ERROR_WANT_WRITE. */
 419         if (error == SSL_ERROR_WANT_READ)
 420             return PEER_RETRY;
 421         else
 422             return PEER_ERROR;
 423     }
 424 }
 425
 426 typedef enum {
 427     /* Both parties succeeded. */
 428     HANDSHAKE_SUCCESS,
 429     /* Client errored. */
 430     CLIENT_ERROR,
 431     /* Server errored. */
 432     SERVER_ERROR,
 433     /* Peers are in inconsistent state. */
 434     INTERNAL_ERROR,
 435     /* One or both peers not done. */
 436     HANDSHAKE_RETRY
 437 } handshake_status_t;
 438
 439 /*
 440  * Determine the handshake outcome.
 441  * last_status: the status of the peer to have acted last.
 442  * previous_status: the status of the peer that didn't act last.
 443  * client_spoke_last: 1 if the client went last.
 444  */
 445 static handshake_status_t handshake_status(peer_status_t last_status,
 446                                            peer_status_t previous_status,
 447                                            int client_spoke_last)
 448 {
 449     switch (last_status) {
 450     case PEER_SUCCESS:
 451         switch (previous_status) {
 452         case PEER_SUCCESS:
 453             /* Both succeeded. */
 454             return HANDSHAKE_SUCCESS;
 455         case PEER_RETRY:
 456             /* Let the first peer finish. */
 457             return HANDSHAKE_RETRY;
 458         case PEER_ERROR:
 459             /*
 460              * Second peer succeeded despite the fact that the first peer
 461              * already errored. This shouldn't happen.
 462              */
 463             return INTERNAL_ERROR;
 464         }
 465
 466     case PEER_RETRY:
 467         if (previous_status == PEER_RETRY) {
 468             /* Neither peer is done. */
 469             return HANDSHAKE_RETRY;
 470         } else {
 471             /*
 472              * Deadlock: second peer is waiting for more input while first
 473              * peer thinks they're done (no more input is coming).
 474              */
 475             return INTERNAL_ERROR;
 476         }
 477     case PEER_ERROR:
 478         switch (previous_status) {
 479         case PEER_SUCCESS:
 480             /*
 481              * First peer succeeded but second peer errored.
 482              * TODO(emilia): we should be able to continue here (with some
 483              * application data?) to ensure the first peer receives the
 484              * alert / close_notify.
 485              */
 486             return client_spoke_last ? CLIENT_ERROR : SERVER_ERROR;
 487         case PEER_RETRY:
 488             /* We errored; let the peer finish. */
 489             return HANDSHAKE_RETRY;
 490         case PEER_ERROR:
 491             /* Both peers errored. Return the one that errored first. */
 492             return client_spoke_last ? SERVER_ERROR : CLIENT_ERROR;
 493         }
 494     }
 495     /* Control should never reach here. */
 496     return INTERNAL_ERROR;
 497 }
 498
 499 /* Convert unsigned char buf's that shouldn't contain any NUL-bytes to char. */
 500 static char *dup_str(const unsigned char *in, size_t len)
 501 {
 502     char *ret;
 503
 504     if(len == 0)
 505         return NULL;
 506
 507     /* Assert that the string does not contain NUL-bytes. */
 508     OPENSSL_assert(OPENSSL_strnlen((const char*)(in), len) == len);
 509     ret = OPENSSL_strndup((const char*)(in), len);
 510     OPENSSL_assert(ret != NULL);
 511     return ret;
 512 }
 513
 514 static HANDSHAKE_RESULT *do_handshake_internal(
 515     SSL_CTX *server_ctx, SSL_CTX *server2_ctx, SSL_CTX *client_ctx,
 516     const SSL_TEST_CTX *test_ctx, SSL_SESSION *session_in,
 517     SSL_SESSION **session_out)
 518 {
 519     SSL *server, *client;
 520     BIO *client_to_server, *server_to_client;
 521     HANDSHAKE_EX_DATA server_ex_data, client_ex_data;
 522     CTX_DATA client_ctx_data, server_ctx_data, server2_ctx_data;
 523     HANDSHAKE_RESULT *ret = HANDSHAKE_RESULT_new();
 524     int client_turn = 1, shutdown = 0;
 525     peer_status_t client_status = PEER_RETRY, server_status = PEER_RETRY;
 526     handshake_status_t status = HANDSHAKE_RETRY;
 527     unsigned char* tick = NULL;
 528     size_t tick_len = 0;
 529     SSL_SESSION* sess = NULL;
 530     const unsigned char *proto = NULL;
 531     /* API dictates unsigned int rather than size_t. */
 532     unsigned int proto_len = 0;
 533
 534     memset(&server_ctx_data, 0, sizeof(server_ctx_data));
 535     memset(&server2_ctx_data, 0, sizeof(server2_ctx_data));
 536     memset(&client_ctx_data, 0, sizeof(client_ctx_data));
 537
 538     configure_handshake_ctx(server_ctx, server2_ctx, client_ctx, test_ctx,
 539                             &server_ctx_data, &server2_ctx_data, &client_ctx_data);
 540
 541     server = SSL_new(server_ctx);
 542     client = SSL_new(client_ctx);
 543     OPENSSL_assert(server != NULL && client != NULL);
 544
 545     configure_handshake_ssl(server, client, test_ctx);
 546     if (session_in != NULL) {
 547         /* In case we're testing resumption without tickets. */
 548         OPENSSL_assert(SSL_CTX_add_session(server_ctx, session_in));
 549         OPENSSL_assert(SSL_set_session(client, session_in));
 550     }
 551
 552     memset(&server_ex_data, 0, sizeof(server_ex_data));
 553     memset(&client_ex_data, 0, sizeof(client_ex_data));
 554
 555     ret->result = SSL_TEST_INTERNAL_ERROR;
 556
 557     client_to_server = BIO_new(BIO_s_mem());
 558     server_to_client = BIO_new(BIO_s_mem());
 559
 560     OPENSSL_assert(client_to_server != NULL && server_to_client != NULL);
 561
 562     /* Non-blocking bio. */
 563     BIO_set_nbio(client_to_server, 1);
 564     BIO_set_nbio(server_to_client, 1);
 565
 566     SSL_set_connect_state(client);
 567     SSL_set_accept_state(server);
 568
 569     /* The bios are now owned by the SSL object. */
 570     SSL_set_bio(client, server_to_client, client_to_server);
 571     OPENSSL_assert(BIO_up_ref(server_to_client) > 0);
 572     OPENSSL_assert(BIO_up_ref(client_to_server) > 0);
 573     SSL_set_bio(server, client_to_server, server_to_client);
 574
 575     ex_data_idx = SSL_get_ex_new_index(0, "ex data", NULL, NULL, NULL);
 576     OPENSSL_assert(ex_data_idx >= 0);
 577
 578     OPENSSL_assert(SSL_set_ex_data(server, ex_data_idx,
 579                                    &server_ex_data) == 1);
 580     OPENSSL_assert(SSL_set_ex_data(client, ex_data_idx,
 581                                    &client_ex_data) == 1);
 582
 583     SSL_set_info_callback(server, &info_cb);
 584     SSL_set_info_callback(client, &info_cb);
 585
 586     /*
 587      * Half-duplex handshake loop.
 588      * Client and server speak to each other synchronously in the same process.
 589      * We use non-blocking BIOs, so whenever one peer blocks for read, it
 590      * returns PEER_RETRY to indicate that it's the other peer's turn to write.
 591      * The handshake succeeds once both peers have succeeded. If one peer
 592      * errors out, we also let the other peer retry (and presumably fail).
 593      */
 594     for(;;) {
 595         if (client_turn) {
 596             client_status = do_handshake_step(client, shutdown);
 597             status = handshake_status(client_status, server_status,
 598                                       1 /* client went last */);
 599         } else {
 600             server_status = do_handshake_step(server, shutdown);
 601             status = handshake_status(server_status, client_status,
 602                                       0 /* server went last */);
 603         }
 604
 605         switch (status) {
 606         case HANDSHAKE_SUCCESS:
 607             if (shutdown) {
 608                 ret->result = SSL_TEST_SUCCESS;
 609                 goto err;
 610             } else {
 611                 client_status = server_status = PEER_RETRY;
 612                 shutdown = 1;
 613                 client_turn = 1;
 614                 break;
 615             }
 616         case CLIENT_ERROR:
 617             ret->result = SSL_TEST_CLIENT_FAIL;
 618             goto err;
 619         case SERVER_ERROR:
 620             ret->result = SSL_TEST_SERVER_FAIL;
 621             goto err;
 622         case INTERNAL_ERROR:
 623             ret->result = SSL_TEST_INTERNAL_ERROR;
 624             goto err;
 625         case HANDSHAKE_RETRY:
 626             /* Continue. */
 627             client_turn ^= 1;
 628             break;
 629         }
 630     }
 631  err:
 632     ret->server_alert_sent = server_ex_data.alert_sent;
 633     ret->server_alert_received = client_ex_data.alert_received;
 634     ret->client_alert_sent = client_ex_data.alert_sent;
 635     ret->client_alert_received = server_ex_data.alert_received;
 636     ret->server_protocol = SSL_version(server);
 637     ret->client_protocol = SSL_version(client);
 638     ret->servername = server_ex_data.servername;
 639     if ((sess = SSL_get0_session(client)) != NULL)
 640         SSL_SESSION_get0_ticket(sess, &tick, &tick_len);
 641     if (tick == NULL || tick_len == 0)
 642         ret->session_ticket = SSL_TEST_SESSION_TICKET_NO;
 643     else
 644         ret->session_ticket = SSL_TEST_SESSION_TICKET_YES;
 645     ret->session_ticket_do_not_call = server_ex_data.session_ticket_do_not_call;
 646
 647     SSL_get0_next_proto_negotiated(client, &proto, &proto_len);
 648     ret->client_npn_negotiated = dup_str(proto, proto_len);
 649
 650     SSL_get0_next_proto_negotiated(server, &proto, &proto_len);
 651     ret->server_npn_negotiated = dup_str(proto, proto_len);
 652
 653     SSL_get0_alpn_selected(client, &proto, &proto_len);
 654     ret->client_alpn_negotiated = dup_str(proto, proto_len);
 655
 656     SSL_get0_alpn_selected(server, &proto, &proto_len);
 657     ret->server_alpn_negotiated = dup_str(proto, proto_len);
 658
 659     ret->client_resumed = SSL_session_reused(client);
 660     ret->server_resumed = SSL_session_reused(server);
 661
 662     if (session_out != NULL)
 663         *session_out = SSL_get1_session(client);
 664
 665     ctx_data_free_data(&server_ctx_data);
 666     ctx_data_free_data(&server2_ctx_data);
 667     ctx_data_free_data(&client_ctx_data);
 668
 669     SSL_free(server);
 670     SSL_free(client);
 671     return ret;
 672 }
 673
 674 HANDSHAKE_RESULT *do_handshake(SSL_CTX *server_ctx, SSL_CTX *server2_ctx,
 675                                SSL_CTX *client_ctx, SSL_CTX *resume_server_ctx,
 676                                SSL_CTX *resume_client_ctx,
 677                                const SSL_TEST_CTX *test_ctx)
 678 {
 679     HANDSHAKE_RESULT *result;
 680     SSL_SESSION *session = NULL;
 681
 682     result = do_handshake_internal(server_ctx, server2_ctx, client_ctx,
 683                                    test_ctx, NULL, &session);
 684     if (test_ctx->handshake_mode == SSL_TEST_HANDSHAKE_SIMPLE)
 685         goto end;
 686
 687     OPENSSL_assert(test_ctx->handshake_mode == SSL_TEST_HANDSHAKE_RESUME);
 688
 689     if (result->result != SSL_TEST_SUCCESS) {
 690         result->result = SSL_TEST_FIRST_HANDSHAKE_FAILED;
 691         return result;
 692     }
 693
 694     HANDSHAKE_RESULT_free(result);
 695     /* We don't support SNI on second handshake yet, so server2_ctx is NULL. */
 696     result = do_handshake_internal(resume_server_ctx, NULL, resume_client_ctx,
 697                                    test_ctx, session, NULL);
 698  end:
 699     SSL_SESSION_free(session);
 700     return result;
 701 }