lib/vtls/polarssl.c

   1 /***************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * Copyright (C) 2010 - 2011, Hoi-Ho Chan, <hoiho.chan@gmail.com>
   9  * Copyright (C) 2012 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
  10  *
  11  * This software is licensed as described in the file COPYING, which
  12  * you should have received as part of this distribution. The terms
  13  * are also available at http://curl.haxx.se/docs/copyright.html.
  14  *
  15  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
  16  * copies of the Software, and permit persons to whom the Software is
  17  * furnished to do so, under the terms of the COPYING file.
  18  *
  19  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  20  * KIND, either express or implied.
  21  *
  22  ***************************************************************************/
  23
  24 /*
  25  * Source file for all PolarSSL-specific code for the TLS/SSL layer. No code
  26  * but vtls.c should ever call or use these functions.
  27  *
  28  */
  29
  30 #include "curl_setup.h"
  31
  32 #ifdef USE_POLARSSL
  33
  34 #include <polarssl/net.h>
  35 #include <polarssl/ssl.h>
  36 #include <polarssl/certs.h>
  37 #include <polarssl/x509.h>
  38 #include <polarssl/version.h>
  39
  40 #if POLARSSL_VERSION_NUMBER < 0x01030000
  41 #error too old PolarSSL
  42 #endif
  43
  44 #include <polarssl/error.h>
  45 #include <polarssl/entropy.h>
  46 #include <polarssl/ctr_drbg.h>
  47
  48 #include "urldata.h"
  49 #include "sendf.h"
  50 #include "inet_pton.h"
  51 #include "polarssl.h"
  52 #include "vtls.h"
  53 #include "parsedate.h"
  54 #include "connect.h" /* for the connect timeout */
  55 #include "select.h"
  56 #include "rawstr.h"
  57 #include "polarssl_threadlock.h"
  58
  59 #define _MPRINTF_REPLACE /* use our functions only */
  60 #include <curl/mprintf.h>
  61 #include "curl_memory.h"
  62 /* The last #include file should be: */
  63 #include "memdebug.h"
  64
  65 /* apply threading? */
  66 #if defined(USE_THREADS_POSIX) || defined(USE_THREADS_WIN32)
  67 #define THREADING_SUPPORT
  68 #endif
  69
  70 #if defined(THREADING_SUPPORT)
  71 static entropy_context entropy;
  72
  73 static int  entropy_init_initialized  = 0;
  74
  75 /* start of entropy_init_mutex() */
  76 static void entropy_init_mutex(entropy_context *ctx)
  77 {
  78   /* lock 0 = entropy_init_mutex() */
  79   polarsslthreadlock_lock_function(0);
  80   if(entropy_init_initialized == 0) {
  81     entropy_init(ctx);
  82     entropy_init_initialized = 1;
  83   }
  84   polarsslthreadlock_unlock_function(0);
  85 }
  86 /* end of entropy_init_mutex() */
  87
  88 /* start of entropy_func_mutex() */
  89 static int entropy_func_mutex(void *data, unsigned char *output, size_t len)
  90 {
  91     int ret;
  92     /* lock 1 = entropy_func_mutex() */
  93     polarsslthreadlock_lock_function(1);
  94     ret = entropy_func(data, output, len);
  95     polarsslthreadlock_unlock_function(1);
  96
  97     return ret;
  98 }
  99 /* end of entropy_func_mutex() */
 100
 101 #endif /* THREADING_SUPPORT */
 102
 103 /* Define this to enable lots of debugging for PolarSSL */
 104 #undef POLARSSL_DEBUG
 105
 106 #ifdef POLARSSL_DEBUG
 107 static void polarssl_debug(void *context, int level, const char *line)
 108 {
 109   struct SessionHandle *data = NULL;
 110
 111   if(!context)
 112     return;
 113
 114   data = (struct SessionHandle *)context;
 115
 116   infof(data, "%s", line);
 117   (void) level;
 118 }
 119 #else
 120 #endif
 121
 122 /* ALPN for http2? */
 123 #ifdef USE_NGHTTP2
 124 #  undef HAS_ALPN
 125 #  ifdef POLARSSL_SSL_ALPN
 126 #    define HAS_ALPN
 127 #  endif
 128 #endif
 129
 130 static Curl_recv polarssl_recv;
 131 static Curl_send polarssl_send;
 132
 133
 134 static CURLcode
 135 polarssl_connect_step1(struct connectdata *conn,
 136                      int sockindex)
 137 {
 138   struct SessionHandle *data = conn->data;
 139   struct ssl_connect_data* connssl = &conn->ssl[sockindex];
 140
 141   bool sni = TRUE; /* default is SNI enabled */
 142   int ret = -1;
 143 #ifdef ENABLE_IPV6
 144   struct in6_addr addr;
 145 #else
 146   struct in_addr addr;
 147 #endif
 148   void *old_session = NULL;
 149   size_t old_session_size = 0;
 150   char errorbuf[128];
 151   memset(errorbuf, 0, sizeof(errorbuf));
 152
 153   /* PolarSSL only supports SSLv3 and TLSv1 */
 154   if(data->set.ssl.version == CURL_SSLVERSION_SSLv2) {
 155     failf(data, "PolarSSL does not support SSLv2");
 156     return CURLE_SSL_CONNECT_ERROR;
 157   }
 158   else if(data->set.ssl.version == CURL_SSLVERSION_SSLv3)
 159     sni = FALSE; /* SSLv3 has no SNI */
 160
 161 #ifdef THREADING_SUPPORT
 162   entropy_init_mutex(&entropy);
 163
 164   if((ret = ctr_drbg_init(&connssl->ctr_drbg, entropy_func_mutex, &entropy,
 165                                connssl->ssn.id, connssl->ssn.length)) != 0) {
 166 #ifdef POLARSSL_ERROR_C
 167      error_strerror(ret, errorbuf, sizeof(errorbuf));
 168 #endif /* POLARSSL_ERROR_C */
 169      failf(data, "Failed - PolarSSL: ctr_drbg_init returned (-0x%04X) %s\n",
 170                                                             -ret, errorbuf);
 171   }
 172 #else
 173   entropy_init(&connssl->entropy);
 174
 175   if((ret = ctr_drbg_init(&connssl->ctr_drbg, entropy_func, &connssl->entropy,
 176                                 connssl->ssn.id, connssl->ssn.length)) != 0) {
 177 #ifdef POLARSSL_ERROR_C
 178      error_strerror(ret, errorbuf, sizeof(errorbuf));
 179 #endif /* POLARSSL_ERROR_C */
 180      failf(data, "Failed - PolarSSL: ctr_drbg_init returned (-0x%04X) %s\n",
 181                                                             -ret, errorbuf);
 182   }
 183 #endif /* THREADING_SUPPORT */
 184
 185   /* Load the trusted CA */
 186   memset(&connssl->cacert, 0, sizeof(x509_crt));
 187
 188   if(data->set.str[STRING_SSL_CAFILE]) {
 189     ret = x509_crt_parse_file(&connssl->cacert,
 190                               data->set.str[STRING_SSL_CAFILE]);
 191
 192     if(ret<0) {
 193 #ifdef POLARSSL_ERROR_C
 194       error_strerror(ret, errorbuf, sizeof(errorbuf));
 195 #endif /* POLARSSL_ERROR_C */
 196       failf(data, "Error reading ca cert file %s - PolarSSL: (-0x%04X) %s",
 197             data->set.str[STRING_SSL_CAFILE], -ret, errorbuf);
 198
 199       if(data->set.ssl.verifypeer)
 200         return CURLE_SSL_CACERT_BADFILE;
 201     }
 202   }
 203
 204   /* Load the client certificate */
 205   memset(&connssl->clicert, 0, sizeof(x509_crt));
 206
 207   if(data->set.str[STRING_CERT]) {
 208     ret = x509_crt_parse_file(&connssl->clicert,
 209                               data->set.str[STRING_CERT]);
 210
 211     if(ret) {
 212 #ifdef POLARSSL_ERROR_C
 213       error_strerror(ret, errorbuf, sizeof(errorbuf));
 214 #endif /* POLARSSL_ERROR_C */
 215       failf(data, "Error reading client cert file %s - PolarSSL: (-0x%04X) %s",
 216             data->set.str[STRING_CERT], -ret, errorbuf);
 217
 218       return CURLE_SSL_CERTPROBLEM;
 219     }
 220   }
 221
 222   /* Load the client private key */
 223   if(data->set.str[STRING_KEY]) {
 224     pk_context pk;
 225     pk_init(&pk);
 226     ret = pk_parse_keyfile(&pk, data->set.str[STRING_KEY],
 227                            data->set.str[STRING_KEY_PASSWD]);
 228     if(ret == 0 && !pk_can_do(&pk, POLARSSL_PK_RSA))
 229       ret = POLARSSL_ERR_PK_TYPE_MISMATCH;
 230     if(ret == 0)
 231       rsa_copy(&connssl->rsa, pk_rsa(pk));
 232     else
 233       rsa_free(&connssl->rsa);
 234     pk_free(&pk);
 235
 236     if(ret) {
 237 #ifdef POLARSSL_ERROR_C
 238       error_strerror(ret, errorbuf, sizeof(errorbuf));
 239 #endif /* POLARSSL_ERROR_C */
 240       failf(data, "Error reading private key %s - PolarSSL: (-0x%04X) %s",
 241             data->set.str[STRING_KEY], -ret, errorbuf);
 242
 243       return CURLE_SSL_CERTPROBLEM;
 244     }
 245   }
 246
 247   /* Load the CRL */
 248   memset(&connssl->crl, 0, sizeof(x509_crl));
 249
 250   if(data->set.str[STRING_SSL_CRLFILE]) {
 251     ret = x509_crl_parse_file(&connssl->crl,
 252                               data->set.str[STRING_SSL_CRLFILE]);
 253
 254     if(ret) {
 255 #ifdef POLARSSL_ERROR_C
 256       error_strerror(ret, errorbuf, sizeof(errorbuf));
 257 #endif /* POLARSSL_ERROR_C */
 258       failf(data, "Error reading CRL file %s - PolarSSL: (-0x%04X) %s",
 259             data->set.str[STRING_SSL_CRLFILE], -ret, errorbuf);
 260
 261       return CURLE_SSL_CRL_BADFILE;
 262     }
 263   }
 264
 265   infof(data, "PolarSSL: Connecting to %s:%d\n",
 266         conn->host.name, conn->remote_port);
 267
 268   if(ssl_init(&connssl->ssl)) {
 269     failf(data, "PolarSSL: ssl_init failed");
 270     return CURLE_SSL_CONNECT_ERROR;
 271   }
 272
 273   ssl_set_endpoint(&connssl->ssl, SSL_IS_CLIENT);
 274   ssl_set_authmode(&connssl->ssl, SSL_VERIFY_OPTIONAL);
 275
 276   ssl_set_rng(&connssl->ssl, ctr_drbg_random,
 277               &connssl->ctr_drbg);
 278   ssl_set_bio(&connssl->ssl,
 279               net_recv, &conn->sock[sockindex],
 280               net_send, &conn->sock[sockindex]);
 281
 282   ssl_set_ciphersuites(&connssl->ssl, ssl_list_ciphersuites());
 283   if(!Curl_ssl_getsessionid(conn, &old_session, &old_session_size)) {
 284     memcpy(&connssl->ssn, old_session, old_session_size);
 285     infof(data, "PolarSSL re-using session\n");
 286   }
 287
 288   ssl_set_session(&connssl->ssl,
 289                   &connssl->ssn);
 290
 291   ssl_set_ca_chain(&connssl->ssl,
 292                    &connssl->cacert,
 293                    &connssl->crl,
 294                    conn->host.name);
 295
 296   ssl_set_own_cert_rsa(&connssl->ssl,
 297                        &connssl->clicert, &connssl->rsa);
 298
 299   if(!Curl_inet_pton(AF_INET, conn->host.name, &addr) &&
 300 #ifdef ENABLE_IPV6
 301      !Curl_inet_pton(AF_INET6, conn->host.name, &addr) &&
 302 #endif
 303      sni && ssl_set_hostname(&connssl->ssl, conn->host.name)) {
 304      infof(data, "WARNING: failed to configure "
 305                  "server name indication (SNI) TLS extension\n");
 306   }
 307
 308 #ifdef HAS_ALPN
 309   if(data->set.httpversion == CURL_HTTP_VERSION_2_0) {
 310     if(data->set.ssl_enable_alpn) {
 311       static const char* protocols[] = {
 312         NGHTTP2_PROTO_VERSION_ID, ALPN_HTTP_1_1, NULL
 313       };
 314       ssl_set_alpn_protocols(&connssl->ssl, protocols);
 315       infof(data, "ALPN, offering %s, %s\n", protocols[0],
 316             protocols[1]);
 317     }
 318   }
 319 #endif
 320
 321 #ifdef POLARSSL_DEBUG
 322   ssl_set_dbg(&connssl->ssl, polarssl_debug, data);
 323 #endif
 324
 325   connssl->connecting_state = ssl_connect_2;
 326
 327   return CURLE_OK;
 328 }
 329
 330 static CURLcode
 331 polarssl_connect_step2(struct connectdata *conn,
 332                      int sockindex)
 333 {
 334   int ret;
 335   struct SessionHandle *data = conn->data;
 336   struct ssl_connect_data* connssl = &conn->ssl[sockindex];
 337   char buffer[1024];
 338
 339 #ifdef HAS_ALPN
 340   const char* next_protocol;
 341 #endif
 342
 343   char errorbuf[128];
 344   memset(errorbuf, 0, sizeof(errorbuf));
 345
 346   conn->recv[sockindex] = polarssl_recv;
 347   conn->send[sockindex] = polarssl_send;
 348
 349   for(;;) {
 350     if(!(ret = ssl_handshake(&connssl->ssl)))
 351       break;
 352     else if(ret != POLARSSL_ERR_NET_WANT_READ &&
 353             ret != POLARSSL_ERR_NET_WANT_WRITE) {
 354 #ifdef POLARSSL_ERROR_C
 355      error_strerror(ret, errorbuf, sizeof(errorbuf));
 356 #endif /* POLARSSL_ERROR_C */
 357      failf(data, "ssl_handshake returned - PolarSSL: (-0x%04X) %s",
 358                                                     -ret, errorbuf);
 359
 360      return CURLE_SSL_CONNECT_ERROR;
 361     }
 362     else {
 363       if(ret == POLARSSL_ERR_NET_WANT_READ) {
 364         connssl->connecting_state = ssl_connect_2_reading;
 365         return CURLE_OK;
 366       }
 367       if(ret == POLARSSL_ERR_NET_WANT_WRITE) {
 368         connssl->connecting_state = ssl_connect_2_writing;
 369         return CURLE_OK;
 370       }
 371       failf(data, "SSL_connect failed with error %d.", ret);
 372       return CURLE_SSL_CONNECT_ERROR;
 373
 374     }
 375   }
 376
 377   infof(data, "PolarSSL: Handshake complete, cipher is %s\n",
 378         ssl_get_ciphersuite(&conn->ssl[sockindex].ssl)
 379     );
 380
 381   ret = ssl_get_verify_result(&conn->ssl[sockindex].ssl);
 382
 383   if(ret && data->set.ssl.verifypeer) {
 384     if(ret & BADCERT_EXPIRED)
 385       failf(data, "Cert verify failed: BADCERT_EXPIRED");
 386
 387     if(ret & BADCERT_REVOKED) {
 388       failf(data, "Cert verify failed: BADCERT_REVOKED");
 389       return CURLE_SSL_CACERT;
 390     }
 391
 392     if(ret & BADCERT_CN_MISMATCH)
 393       failf(data, "Cert verify failed: BADCERT_CN_MISMATCH");
 394
 395     if(ret & BADCERT_NOT_TRUSTED)
 396       failf(data, "Cert verify failed: BADCERT_NOT_TRUSTED");
 397
 398     return CURLE_PEER_FAILED_VERIFICATION;
 399   }
 400
 401   if(ssl_get_peer_cert(&(connssl->ssl))) {
 402     /* If the session was resumed, there will be no peer certs */
 403     memset(buffer, 0, sizeof(buffer));
 404
 405     if(x509_crt_info(buffer, sizeof(buffer), (char *)"* ",
 406                      ssl_get_peer_cert(&(connssl->ssl))) != -1)
 407       infof(data, "Dumping cert info:\n%s\n", buffer);
 408   }
 409
 410 #ifdef HAS_ALPN
 411   if(data->set.ssl_enable_alpn) {
 412     next_protocol = ssl_get_alpn_protocol(&connssl->ssl);
 413
 414     if(next_protocol != NULL) {
 415       infof(data, "ALPN, server accepted to use %s\n", next_protocol);
 416
 417       if(strncmp(next_protocol, NGHTTP2_PROTO_VERSION_ID,
 418                   NGHTTP2_PROTO_VERSION_ID_LEN)) {
 419         conn->negnpn = NPN_HTTP2;
 420       }
 421       else if(strncmp(next_protocol, ALPN_HTTP_1_1, ALPN_HTTP_1_1_LENGTH)) {
 422         conn->negnpn = NPN_HTTP1_1;
 423       }
 424     }
 425     else {
 426       infof(data, "ALPN, server did not agree to a protocol\n");
 427     }
 428   }
 429 #endif
 430
 431   connssl->connecting_state = ssl_connect_3;
 432   infof(data, "SSL connected\n");
 433
 434   return CURLE_OK;
 435 }
 436
 437 static CURLcode
 438 polarssl_connect_step3(struct connectdata *conn,
 439                      int sockindex)
 440 {
 441   CURLcode retcode = CURLE_OK;
 442   struct ssl_connect_data *connssl = &conn->ssl[sockindex];
 443   struct SessionHandle *data = conn->data;
 444   void *old_ssl_sessionid = NULL;
 445   ssl_session *our_ssl_sessionid = &conn->ssl[sockindex].ssn ;
 446   int incache;
 447
 448   DEBUGASSERT(ssl_connect_3 == connssl->connecting_state);
 449
 450   /* Save the current session data for possible re-use */
 451   incache = !(Curl_ssl_getsessionid(conn, &old_ssl_sessionid, NULL));
 452   if(incache) {
 453     if(old_ssl_sessionid != our_ssl_sessionid) {
 454       infof(data, "old SSL session ID is stale, removing\n");
 455       Curl_ssl_delsessionid(conn, old_ssl_sessionid);
 456       incache = FALSE;
 457     }
 458   }
 459   if(!incache) {
 460     void *new_session = malloc(sizeof(ssl_session));
 461
 462     if(new_session) {
 463       memcpy(new_session, our_ssl_sessionid,
 464              sizeof(ssl_session));
 465
 466       retcode = Curl_ssl_addsessionid(conn, new_session,
 467                                    sizeof(ssl_session));
 468     }
 469     else {
 470       retcode = CURLE_OUT_OF_MEMORY;
 471     }
 472
 473     if(retcode) {
 474       failf(data, "failed to store ssl session");
 475       return retcode;
 476     }
 477   }
 478
 479   connssl->connecting_state = ssl_connect_done;
 480
 481   return CURLE_OK;
 482 }
 483
 484 static ssize_t polarssl_send(struct connectdata *conn,
 485                              int sockindex,
 486                              const void *mem,
 487                              size_t len,
 488                              CURLcode *curlcode)
 489 {
 490   int ret = -1;
 491
 492   ret = ssl_write(&conn->ssl[sockindex].ssl,
 493                   (unsigned char *)mem, len);
 494
 495   if(ret < 0) {
 496     *curlcode = (ret == POLARSSL_ERR_NET_WANT_WRITE) ?
 497       CURLE_AGAIN : CURLE_SEND_ERROR;
 498     ret = -1;
 499   }
 500
 501   return ret;
 502 }
 503
 504 void Curl_polarssl_close_all(struct SessionHandle *data)
 505 {
 506   (void)data;
 507 }
 508
 509 void Curl_polarssl_close(struct connectdata *conn, int sockindex)
 510 {
 511   rsa_free(&conn->ssl[sockindex].rsa);
 512   x509_crt_free(&conn->ssl[sockindex].clicert);
 513   x509_crt_free(&conn->ssl[sockindex].cacert);
 514   x509_crl_free(&conn->ssl[sockindex].crl);
 515   ssl_free(&conn->ssl[sockindex].ssl);
 516 }
 517
 518 static ssize_t polarssl_recv(struct connectdata *conn,
 519                              int num,
 520                              char *buf,
 521                              size_t buffersize,
 522                              CURLcode *curlcode)
 523 {
 524   int ret = -1;
 525   ssize_t len = -1;
 526
 527   memset(buf, 0, buffersize);
 528   ret = ssl_read(&conn->ssl[num].ssl, (unsigned char *)buf, buffersize);
 529
 530   if(ret <= 0) {
 531     if(ret == POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY)
 532       return 0;
 533
 534     *curlcode = (ret == POLARSSL_ERR_NET_WANT_READ) ?
 535       CURLE_AGAIN : CURLE_RECV_ERROR;
 536     return -1;
 537   }
 538
 539   len = ret;
 540
 541   return len;
 542 }
 543
 544 void Curl_polarssl_session_free(void *ptr)
 545 {
 546   free(ptr);
 547 }
 548
 549 size_t Curl_polarssl_version(char *buffer, size_t size)
 550 {
 551   unsigned int version = version_get_number();
 552   return snprintf(buffer, size, "PolarSSL/%d.%d.%d", version>>24,
 553                   (version>>16)&0xff, (version>>8)&0xff);
 554 }
 555
 556 static CURLcode
 557 polarssl_connect_common(struct connectdata *conn,
 558                         int sockindex,
 559                         bool nonblocking,
 560                         bool *done)
 561 {
 562   CURLcode retcode;
 563   struct SessionHandle *data = conn->data;
 564   struct ssl_connect_data *connssl = &conn->ssl[sockindex];
 565   curl_socket_t sockfd = conn->sock[sockindex];
 566   long timeout_ms;
 567   int what;
 568
 569   /* check if the connection has already been established */
 570   if(ssl_connection_complete == connssl->state) {
 571     *done = TRUE;
 572     return CURLE_OK;
 573   }
 574
 575   if(ssl_connect_1==connssl->connecting_state) {
 576     /* Find out how much more time we're allowed */
 577     timeout_ms = Curl_timeleft(data, NULL, TRUE);
 578
 579     if(timeout_ms < 0) {
 580       /* no need to continue if time already is up */
 581       failf(data, "SSL connection timeout");
 582       return CURLE_OPERATION_TIMEDOUT;
 583     }
 584     retcode = polarssl_connect_step1(conn, sockindex);
 585     if(retcode)
 586       return retcode;
 587   }
 588
 589   while(ssl_connect_2 == connssl->connecting_state ||
 590         ssl_connect_2_reading == connssl->connecting_state ||
 591         ssl_connect_2_writing == connssl->connecting_state) {
 592
 593     /* check allowed time left */
 594     timeout_ms = Curl_timeleft(data, NULL, TRUE);
 595
 596     if(timeout_ms < 0) {
 597       /* no need to continue if time already is up */
 598       failf(data, "SSL connection timeout");
 599       return CURLE_OPERATION_TIMEDOUT;
 600     }
 601
 602     /* if ssl is expecting something, check if it's available. */
 603     if(connssl->connecting_state == ssl_connect_2_reading
 604        || connssl->connecting_state == ssl_connect_2_writing) {
 605
 606       curl_socket_t writefd = ssl_connect_2_writing==
 607         connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
 608       curl_socket_t readfd = ssl_connect_2_reading==
 609         connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
 610
 611       what = Curl_socket_ready(readfd, writefd, nonblocking?0:timeout_ms);
 612       if(what < 0) {
 613         /* fatal error */
 614         failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
 615         return CURLE_SSL_CONNECT_ERROR;
 616       }
 617       else if(0 == what) {
 618         if(nonblocking) {
 619           *done = FALSE;
 620           return CURLE_OK;
 621         }
 622         else {
 623           /* timeout */
 624           failf(data, "SSL connection timeout");
 625           return CURLE_OPERATION_TIMEDOUT;
 626         }
 627       }
 628       /* socket is readable or writable */
 629     }
 630
 631     /* Run transaction, and return to the caller if it failed or if
 632      * this connection is part of a multi handle and this loop would
 633      * execute again. This permits the owner of a multi handle to
 634      * abort a connection attempt before step2 has completed while
 635      * ensuring that a client using select() or epoll() will always
 636      * have a valid fdset to wait on.
 637      */
 638     retcode = polarssl_connect_step2(conn, sockindex);
 639     if(retcode || (nonblocking &&
 640                    (ssl_connect_2 == connssl->connecting_state ||
 641                     ssl_connect_2_reading == connssl->connecting_state ||
 642                     ssl_connect_2_writing == connssl->connecting_state)))
 643       return retcode;
 644
 645   } /* repeat step2 until all transactions are done. */
 646
 647   if(ssl_connect_3==connssl->connecting_state) {
 648     retcode = polarssl_connect_step3(conn, sockindex);
 649     if(retcode)
 650       return retcode;
 651   }
 652
 653   if(ssl_connect_done==connssl->connecting_state) {
 654     connssl->state = ssl_connection_complete;
 655     conn->recv[sockindex] = polarssl_recv;
 656     conn->send[sockindex] = polarssl_send;
 657     *done = TRUE;
 658   }
 659   else
 660     *done = FALSE;
 661
 662   /* Reset our connect state machine */
 663   connssl->connecting_state = ssl_connect_1;
 664
 665   return CURLE_OK;
 666 }
 667
 668 CURLcode
 669 Curl_polarssl_connect_nonblocking(struct connectdata *conn,
 670                                 int sockindex,
 671                                 bool *done)
 672 {
 673   return polarssl_connect_common(conn, sockindex, TRUE, done);
 674 }
 675
 676
 677 CURLcode
 678 Curl_polarssl_connect(struct connectdata *conn,
 679                     int sockindex)
 680 {
 681   CURLcode retcode;
 682   bool done = FALSE;
 683
 684   retcode = polarssl_connect_common(conn, sockindex, FALSE, &done);
 685   if(retcode)
 686     return retcode;
 687
 688   DEBUGASSERT(done);
 689
 690   return CURLE_OK;
 691 }
 692
 693 /*
 694  * return 0 error initializing SSL
 695  * return 1 SSL initialized successfully
 696  */
 697 int polarssl_init(void)
 698 {
 699   return polarsslthreadlock_thread_setup();
 700 }
 701
 702 void polarssl_cleanup(void)
 703 {
 704   (void)polarsslthreadlock_thread_cleanup();
 705 }
 706
 707 #endif /* USE_POLARSSL */