lib/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 - 2013, 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 sslgen.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 >= 0x01000000
  41 #include <polarssl/error.h>
  42 #endif /* POLARSSL_VERSION_NUMBER >= 0x01000000 */
  43
  44 #if POLARSSL_VERSION_NUMBER>0x01010000
  45 #include <polarssl/entropy.h>
  46 #include <polarssl/ctr_drbg.h>
  47 #else
  48 #include <polarssl/havege.h>
  49 #endif /* POLARSSL_VERSION_NUMBER>0x01010000 */
  50
  51
  52 #if POLARSSL_VERSION_NUMBER<0x01000000
  53 /*
  54   Earlier versions of polarssl had no WANT_READ or WANT_WRITE, only TRY_AGAIN
  55 */
  56 #define POLARSSL_ERR_NET_WANT_READ  POLARSSL_ERR_NET_TRY_AGAIN
  57 #define POLARSSL_ERR_NET_WANT_WRITE POLARSSL_ERR_NET_TRY_AGAIN
  58 #endif
  59
  60 #include "urldata.h"
  61 #include "sendf.h"
  62 #include "inet_pton.h"
  63 #include "polarssl.h"
  64 #include "sslgen.h"
  65 #include "parsedate.h"
  66 #include "connect.h" /* for the connect timeout */
  67 #include "select.h"
  68 #include "rawstr.h"
  69 #include "polarssl_threadlock.h"
  70
  71 #define _MPRINTF_REPLACE /* use our functions only */
  72 #include <curl/mprintf.h>
  73 #include "curl_memory.h"
  74 /* The last #include file should be: */
  75 #include "memdebug.h"
  76
  77 /* apply threading? */
  78 #if defined(USE_THREADS_POSIX) || defined(USE_THREADS_WIN32)
  79 #define THREADING_SUPPORT
  80 #endif
  81
  82 #if defined(THREADING_SUPPORT) && POLARSSL_VERSION_NUMBER>0x01010000
  83 static entropy_context entropy;
  84
  85 static int  entropy_init_initialized  = 0;
  86
  87 /* start of entropy_init_mutex() */
  88 static void entropy_init_mutex(entropy_context *ctx)
  89 {
  90   /* lock 0 = entropy_init_mutex() */
  91   polarsslthreadlock_lock_function(0);
  92   if(entropy_init_initialized == 0) {
  93     entropy_init(ctx);
  94     entropy_init_initialized = 1;
  95   }
  96   polarsslthreadlock_unlock_function(0);
  97 }
  98 /* end of entropy_init_mutex() */
  99
 100 /* start of entropy_func_mutex() */
 101 static int entropy_func_mutex(void *data, unsigned char *output, size_t len)
 102 {
 103     int ret;
 104     /* lock 1 = entropy_func_mutex() */
 105     polarsslthreadlock_lock_function(1);
 106     ret = entropy_func(data, output, len);
 107     polarsslthreadlock_unlock_function(1);
 108
 109     return ret;
 110 }
 111 /* end of entropy_func_mutex() */
 112
 113 #endif /* THREADING_SUPPORT && POLARSSL_VERSION_NUMBER>0x01010000 */
 114
 115 /* Define this to enable lots of debugging for PolarSSL */
 116 #undef POLARSSL_DEBUG
 117
 118 #ifdef POLARSSL_DEBUG
 119 static void polarssl_debug(void *context, int level, char *line)
 120 {
 121   struct SessionHandle *data = NULL;
 122
 123   if(!context)
 124     return;
 125
 126   data = (struct SessionHandle *)context;
 127
 128   infof(data, "%s\n", line);
 129 }
 130 #else
 131 #endif
 132
 133 static Curl_recv polarssl_recv;
 134 static Curl_send polarssl_send;
 135
 136
 137 static CURLcode
 138 polarssl_connect_step1(struct connectdata *conn,
 139                      int sockindex)
 140 {
 141   struct SessionHandle *data = conn->data;
 142   struct ssl_connect_data* connssl = &conn->ssl[sockindex];
 143
 144   bool sni = TRUE; /* default is SNI enabled */
 145   int ret = -1;
 146 #ifdef ENABLE_IPV6
 147   struct in6_addr addr;
 148 #else
 149   struct in_addr addr;
 150 #endif
 151   void *old_session = NULL;
 152   size_t old_session_size = 0;
 153
 154   char errorbuf[128];
 155   memset(errorbuf, 0, sizeof(errorbuf));
 156
 157
 158   /* PolarSSL only supports SSLv3 and TLSv1 */
 159   if(data->set.ssl.version == CURL_SSLVERSION_SSLv2) {
 160     failf(data, "PolarSSL does not support SSLv2");
 161     return CURLE_SSL_CONNECT_ERROR;
 162   }
 163   else if(data->set.ssl.version == CURL_SSLVERSION_SSLv3)
 164     sni = FALSE; /* SSLv3 has no SNI */
 165
 166 #if POLARSSL_VERSION_NUMBER<0x01010000
 167   havege_init(&connssl->hs);
 168 #else
 169 #ifdef THREADING_SUPPORT
 170   entropy_init_mutex(&entropy);
 171
 172   if((ret = ctr_drbg_init(&connssl->ctr_drbg, entropy_func_mutex, &entropy,
 173                                connssl->ssn.id, connssl->ssn.length)) != 0) {
 174 #ifdef POLARSSL_ERROR_C
 175      error_strerror(ret, errorbuf, sizeof(errorbuf));
 176 #endif /* POLARSSL_ERROR_C */
 177      failf(data, "Failed - PolarSSL: ctr_drbg_init returned (-0x%04X) %s\n",
 178                                                             -ret, errorbuf);
 179   }
 180 #else
 181   entropy_init(&connssl->entropy);
 182
 183   if((ret = ctr_drbg_init(&connssl->ctr_drbg, entropy_func, &connssl->entropy,
 184                                 connssl->ssn.id, connssl->ssn.length)) != 0) {
 185 #ifdef POLARSSL_ERROR_C
 186      error_strerror(ret, errorbuf, sizeof(errorbuf));
 187 #endif /* POLARSSL_ERROR_C */
 188      failf(data, "Failed - PolarSSL: ctr_drbg_init returned (-0x%04X) %s\n",
 189                                                             -ret, errorbuf);
 190   }
 191 #endif /* THREADING_SUPPORT */
 192 #endif /* POLARSSL_VERSION_NUMBER<0x01010000 */
 193
 194   /* Load the trusted CA */
 195   memset(&connssl->cacert, 0, sizeof(x509_cert));
 196
 197   if(data->set.str[STRING_SSL_CAFILE]) {
 198     ret = x509parse_crtfile(&connssl->cacert,
 199                             data->set.str[STRING_SSL_CAFILE]);
 200
 201     if(ret<0) {
 202 #ifdef POLARSSL_ERROR_C
 203       error_strerror(ret, errorbuf, sizeof(errorbuf));
 204 #endif /* POLARSSL_ERROR_C */
 205       failf(data, "Error reading ca cert file %s - PolarSSL: (-0x%04X) %s",
 206             data->set.str[STRING_SSL_CAFILE], -ret, errorbuf);
 207
 208       if(data->set.ssl.verifypeer)
 209         return CURLE_SSL_CACERT_BADFILE;
 210     }
 211   }
 212
 213   /* Load the client certificate */
 214   memset(&connssl->clicert, 0, sizeof(x509_cert));
 215
 216   if(data->set.str[STRING_CERT]) {
 217     ret = x509parse_crtfile(&connssl->clicert,
 218                             data->set.str[STRING_CERT]);
 219
 220     if(ret) {
 221 #ifdef POLARSSL_ERROR_C
 222       error_strerror(ret, errorbuf, sizeof(errorbuf));
 223 #endif /* POLARSSL_ERROR_C */
 224       failf(data, "Error reading client cert file %s - PolarSSL: (-0x%04X) %s",
 225             data->set.str[STRING_CERT], -ret, errorbuf);
 226
 227       return CURLE_SSL_CERTPROBLEM;
 228     }
 229   }
 230
 231   /* Load the client private key */
 232   if(data->set.str[STRING_KEY]) {
 233     ret = x509parse_keyfile(&connssl->rsa,
 234                             data->set.str[STRING_KEY],
 235                             data->set.str[STRING_KEY_PASSWD]);
 236
 237     if(ret) {
 238 #ifdef POLARSSL_ERROR_C
 239       error_strerror(ret, errorbuf, sizeof(errorbuf));
 240 #endif /* POLARSSL_ERROR_C */
 241       failf(data, "Error reading private key %s - PolarSSL: (-0x%04X) %s",
 242             data->set.str[STRING_KEY], -ret, errorbuf);
 243
 244       return CURLE_SSL_CERTPROBLEM;
 245     }
 246   }
 247
 248   /* Load the CRL */
 249   memset(&connssl->crl, 0, sizeof(x509_crl));
 250
 251   if(data->set.str[STRING_SSL_CRLFILE]) {
 252     ret = x509parse_crlfile(&connssl->crl,
 253                             data->set.str[STRING_SSL_CRLFILE]);
 254
 255     if(ret) {
 256 #ifdef POLARSSL_ERROR_C
 257       error_strerror(ret, errorbuf, sizeof(errorbuf));
 258 #endif /* POLARSSL_ERROR_C */
 259       failf(data, "Error reading CRL file %s - PolarSSL: (-0x%04X) %s",
 260             data->set.str[STRING_SSL_CRLFILE], -ret, errorbuf);
 261
 262       return CURLE_SSL_CRL_BADFILE;
 263     }
 264   }
 265
 266   infof(data, "PolarSSL: Connecting to %s:%d\n",
 267         conn->host.name, conn->remote_port);
 268
 269   if(ssl_init(&connssl->ssl)) {
 270     failf(data, "PolarSSL: ssl_init failed");
 271     return CURLE_SSL_CONNECT_ERROR;
 272   }
 273
 274   ssl_set_endpoint(&connssl->ssl, SSL_IS_CLIENT);
 275   ssl_set_authmode(&connssl->ssl, SSL_VERIFY_OPTIONAL);
 276
 277 #if POLARSSL_VERSION_NUMBER<0x01010000
 278   ssl_set_rng(&connssl->ssl, havege_rand,
 279               &connssl->hs);
 280 #else
 281   ssl_set_rng(&connssl->ssl, ctr_drbg_random,
 282               &connssl->ctr_drbg);
 283 #endif /* POLARSSL_VERSION_NUMBER<0x01010000 */
 284   ssl_set_bio(&connssl->ssl,
 285               net_recv, &conn->sock[sockindex],
 286               net_send, &conn->sock[sockindex]);
 287
 288
 289 #if POLARSSL_VERSION_NUMBER<0x01000000
 290   ssl_set_ciphers(&connssl->ssl, ssl_default_ciphers);
 291 #else
 292   ssl_set_ciphersuites(&connssl->ssl, ssl_default_ciphersuites);
 293 #endif
 294   if(!Curl_ssl_getsessionid(conn, &old_session, &old_session_size)) {
 295     memcpy(&connssl->ssn, old_session, old_session_size);
 296     infof(data, "PolarSSL re-using session\n");
 297   }
 298
 299 /* PolarSSL SVN revision r1316 to r1317, matching <1.2.0 is to cover Ubuntu's
 300    1.1.4 version and the like */
 301 #if POLARSSL_VERSION_NUMBER<0x01020000
 302   ssl_set_session(&connssl->ssl, 1, 600,
 303                   &connssl->ssn);
 304 #else
 305   ssl_set_session(&connssl->ssl,
 306                   &connssl->ssn);
 307 #endif
 308
 309   ssl_set_ca_chain(&connssl->ssl,
 310                    &connssl->cacert,
 311                    &connssl->crl,
 312                    conn->host.name);
 313
 314   ssl_set_own_cert(&connssl->ssl,
 315                    &connssl->clicert, &connssl->rsa);
 316
 317   if(!Curl_inet_pton(AF_INET, conn->host.name, &addr) &&
 318 #ifdef ENABLE_IPV6
 319      !Curl_inet_pton(AF_INET6, conn->host.name, &addr) &&
 320 #endif
 321      sni && ssl_set_hostname(&connssl->ssl, conn->host.name)) {
 322      infof(data, "WARNING: failed to configure "
 323                  "server name indication (SNI) TLS extension\n");
 324   }
 325
 326 #ifdef POLARSSL_DEBUG
 327   ssl_set_dbg(&connssl->ssl, polarssl_debug, data);
 328 #endif
 329
 330   connssl->connecting_state = ssl_connect_2;
 331
 332   return CURLE_OK;
 333 }
 334
 335 static CURLcode
 336 polarssl_connect_step2(struct connectdata *conn,
 337                      int sockindex)
 338 {
 339   int ret;
 340   struct SessionHandle *data = conn->data;
 341   struct ssl_connect_data* connssl = &conn->ssl[sockindex];
 342   char buffer[1024];
 343
 344   char errorbuf[128];
 345   memset(errorbuf, 0, sizeof(errorbuf));
 346
 347   conn->recv[sockindex] = polarssl_recv;
 348   conn->send[sockindex] = polarssl_send;
 349
 350   for(;;) {
 351     if(!(ret = ssl_handshake(&connssl->ssl)))
 352       break;
 353     else if(ret != POLARSSL_ERR_NET_WANT_READ &&
 354             ret != POLARSSL_ERR_NET_WANT_WRITE) {
 355 #ifdef POLARSSL_ERROR_C
 356      error_strerror(ret, errorbuf, sizeof(errorbuf));
 357 #endif /* POLARSSL_ERROR_C */
 358      failf(data, "ssl_handshake returned - PolarSSL: (-0x%04X) %s",
 359                                                     -ret, errorbuf);
 360
 361      return CURLE_SSL_CONNECT_ERROR;
 362     }
 363     else {
 364       if(ret == POLARSSL_ERR_NET_WANT_READ) {
 365         connssl->connecting_state = ssl_connect_2_reading;
 366         return CURLE_OK;
 367       }
 368       if(ret == POLARSSL_ERR_NET_WANT_WRITE) {
 369         connssl->connecting_state = ssl_connect_2_writing;
 370         return CURLE_OK;
 371       }
 372       failf(data, "SSL_connect failed with error %d.", ret);
 373       return CURLE_SSL_CONNECT_ERROR;
 374
 375     }
 376   }
 377
 378   infof(data, "PolarSSL: Handshake complete, cipher is %s\n",
 379 #if POLARSSL_VERSION_NUMBER<0x01000000
 380         ssl_get_cipher(&conn->ssl[sockindex].ssl)
 381 #elif POLARSSL_VERSION_NUMBER >= 0x01010000
 382         ssl_get_ciphersuite(&conn->ssl[sockindex].ssl)
 383 #else
 384         ssl_get_ciphersuite_name(&conn->ssl[sockindex].ssl)
 385 #endif
 386     );
 387
 388   ret = ssl_get_verify_result(&conn->ssl[sockindex].ssl);
 389
 390   if(ret && data->set.ssl.verifypeer) {
 391     if(ret & BADCERT_EXPIRED)
 392       failf(data, "Cert verify failed: BADCERT_EXPIRED");
 393
 394     if(ret & BADCERT_REVOKED) {
 395       failf(data, "Cert verify failed: BADCERT_REVOKED");
 396       return CURLE_SSL_CACERT;
 397     }
 398
 399     if(ret & BADCERT_CN_MISMATCH)
 400       failf(data, "Cert verify failed: BADCERT_CN_MISMATCH");
 401
 402     if(ret & BADCERT_NOT_TRUSTED)
 403       failf(data, "Cert verify failed: BADCERT_NOT_TRUSTED");
 404
 405     return CURLE_PEER_FAILED_VERIFICATION;
 406   }
 407
 408 /* PolarSSL SVN revision r1316 to r1317, matching <1.2.0 is to cover Ubuntu's
 409    1.1.4 version and the like */
 410 #if POLARSSL_VERSION_NUMBER<0x01020000
 411   if(conn->ssl[sockindex].ssl.peer_cert) {
 412 #else
 413   if(ssl_get_peer_cert(&(connssl->ssl))) {
 414 #endif
 415     /* If the session was resumed, there will be no peer certs */
 416     memset(buffer, 0, sizeof(buffer));
 417
 418 /* PolarSSL SVN revision r1316 to r1317, matching <1.2.0 is to cover Ubuntu's
 419    1.1.4 version and the like */
 420 #if POLARSSL_VERSION_NUMBER<0x01020000
 421     if(x509parse_cert_info(buffer, sizeof(buffer), (char *)"* ",
 422                            conn->ssl[sockindex].ssl.peer_cert) != -1)
 423 #else
 424     if(x509parse_cert_info(buffer, sizeof(buffer), (char *)"* ",
 425                            ssl_get_peer_cert(&(connssl->ssl))) != -1)
 426 #endif
 427       infof(data, "Dumping cert info:\n%s\n", buffer);
 428   }
 429
 430   connssl->connecting_state = ssl_connect_3;
 431   infof(data, "SSL connected\n");
 432
 433   return CURLE_OK;
 434 }
 435
 436 static CURLcode
 437 polarssl_connect_step3(struct connectdata *conn,
 438                      int sockindex)
 439 {
 440   CURLcode retcode = CURLE_OK;
 441   struct ssl_connect_data *connssl = &conn->ssl[sockindex];
 442   struct SessionHandle *data = conn->data;
 443   void *old_ssl_sessionid = NULL;
 444   ssl_session *our_ssl_sessionid = &conn->ssl[sockindex].ssn ;
 445   int incache;
 446
 447   DEBUGASSERT(ssl_connect_3 == connssl->connecting_state);
 448
 449   /* Save the current session data for possible re-use */
 450   incache = !(Curl_ssl_getsessionid(conn, &old_ssl_sessionid, NULL));
 451   if(incache) {
 452     if(old_ssl_sessionid != our_ssl_sessionid) {
 453       infof(data, "old SSL session ID is stale, removing\n");
 454       Curl_ssl_delsessionid(conn, old_ssl_sessionid);
 455       incache = FALSE;
 456     }
 457   }
 458   if(!incache) {
 459     void *new_session = malloc(sizeof(ssl_session));
 460
 461     if(new_session) {
 462       memcpy(new_session, our_ssl_sessionid,
 463              sizeof(ssl_session));
 464
 465       retcode = Curl_ssl_addsessionid(conn, new_session,
 466                                    sizeof(ssl_session));
 467     }
 468     else {
 469       retcode = CURLE_OUT_OF_MEMORY;
 470     }
 471
 472     if(retcode) {
 473       failf(data, "failed to store ssl session");
 474       return retcode;
 475     }
 476   }
 477
 478   connssl->connecting_state = ssl_connect_done;
 479
 480   return CURLE_OK;
 481 }
 482
 483 static ssize_t polarssl_send(struct connectdata *conn,
 484                              int sockindex,
 485                              const void *mem,
 486                              size_t len,
 487                              CURLcode *curlcode)
 488 {
 489   int ret = -1;
 490
 491   ret = ssl_write(&conn->ssl[sockindex].ssl,
 492                   (unsigned char *)mem, len);
 493
 494   if(ret < 0) {
 495     *curlcode = (ret == POLARSSL_ERR_NET_WANT_WRITE) ?
 496       CURLE_AGAIN : CURLE_SEND_ERROR;
 497     ret = -1;
 498   }
 499
 500   return ret;
 501 }
 502
 503 void Curl_polarssl_close_all(struct SessionHandle *data)
 504 {
 505   (void)data;
 506 }
 507
 508 void Curl_polarssl_close(struct connectdata *conn, int sockindex)
 509 {
 510   rsa_free(&conn->ssl[sockindex].rsa);
 511   x509_free(&conn->ssl[sockindex].clicert);
 512   x509_free(&conn->ssl[sockindex].cacert);
 513   x509_crl_free(&conn->ssl[sockindex].crl);
 514   ssl_free(&conn->ssl[sockindex].ssl);
 515 }
 516
 517 static ssize_t polarssl_recv(struct connectdata *conn,
 518                              int num,
 519                              char *buf,
 520                              size_t buffersize,
 521                              CURLcode *curlcode)
 522 {
 523   int ret = -1;
 524   ssize_t len = -1;
 525
 526   memset(buf, 0, buffersize);
 527   ret = ssl_read(&conn->ssl[num].ssl, (unsigned char *)buf, buffersize);
 528
 529   if(ret <= 0) {
 530     if(ret == POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY)
 531       return 0;
 532
 533     *curlcode = (ret == POLARSSL_ERR_NET_WANT_READ) ?
 534       CURLE_AGAIN : CURLE_RECV_ERROR;
 535     return -1;
 536   }
 537
 538   len = ret;
 539
 540   return len;
 541 }
 542
 543 void Curl_polarssl_session_free(void *ptr)
 544 {
 545   free(ptr);
 546 }
 547
 548 size_t Curl_polarssl_version(char *buffer, size_t size)
 549 {
 550   unsigned int version = version_get_number();
 551   return snprintf(buffer, size, "PolarSSL/%d.%d.%d", version>>24,
 552                   (version>>16)&0xff, (version>>8)&0xff);
 553 }
 554
 555 static CURLcode
 556 polarssl_connect_common(struct connectdata *conn,
 557                         int sockindex,
 558                         bool nonblocking,
 559                         bool *done)
 560 {
 561   CURLcode retcode;
 562   struct SessionHandle *data = conn->data;
 563   struct ssl_connect_data *connssl = &conn->ssl[sockindex];
 564   curl_socket_t sockfd = conn->sock[sockindex];
 565   long timeout_ms;
 566   int what;
 567
 568   /* check if the connection has already been established */
 569   if(ssl_connection_complete == connssl->state) {
 570     *done = TRUE;
 571     return CURLE_OK;
 572   }
 573
 574   if(ssl_connect_1==connssl->connecting_state) {
 575     /* Find out how much more time we're allowed */
 576     timeout_ms = Curl_timeleft(data, NULL, TRUE);
 577
 578     if(timeout_ms < 0) {
 579       /* no need to continue if time already is up */
 580       failf(data, "SSL connection timeout");
 581       return CURLE_OPERATION_TIMEDOUT;
 582     }
 583     retcode = polarssl_connect_step1(conn, sockindex);
 584     if(retcode)
 585       return retcode;
 586   }
 587
 588   while(ssl_connect_2 == connssl->connecting_state ||
 589         ssl_connect_2_reading == connssl->connecting_state ||
 590         ssl_connect_2_writing == connssl->connecting_state) {
 591
 592     /* check allowed time left */
 593     timeout_ms = Curl_timeleft(data, NULL, TRUE);
 594
 595     if(timeout_ms < 0) {
 596       /* no need to continue if time already is up */
 597       failf(data, "SSL connection timeout");
 598       return CURLE_OPERATION_TIMEDOUT;
 599     }
 600
 601     /* if ssl is expecting something, check if it's available. */
 602     if(connssl->connecting_state == ssl_connect_2_reading
 603        || connssl->connecting_state == ssl_connect_2_writing) {
 604
 605       curl_socket_t writefd = ssl_connect_2_writing==
 606         connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
 607       curl_socket_t readfd = ssl_connect_2_reading==
 608         connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
 609
 610       what = Curl_socket_ready(readfd, writefd, nonblocking?0:timeout_ms);
 611       if(what < 0) {
 612         /* fatal error */
 613         failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
 614         return CURLE_SSL_CONNECT_ERROR;
 615       }
 616       else if(0 == what) {
 617         if(nonblocking) {
 618           *done = FALSE;
 619           return CURLE_OK;
 620         }
 621         else {
 622           /* timeout */
 623           failf(data, "SSL connection timeout");
 624           return CURLE_OPERATION_TIMEDOUT;
 625         }
 626       }
 627       /* socket is readable or writable */
 628     }
 629
 630     /* Run transaction, and return to the caller if it failed or if
 631      * this connection is part of a multi handle and this loop would
 632      * execute again. This permits the owner of a multi handle to
 633      * abort a connection attempt before step2 has completed while
 634      * ensuring that a client using select() or epoll() will always
 635      * have a valid fdset to wait on.
 636      */
 637     retcode = polarssl_connect_step2(conn, sockindex);
 638     if(retcode || (nonblocking &&
 639                    (ssl_connect_2 == connssl->connecting_state ||
 640                     ssl_connect_2_reading == connssl->connecting_state ||
 641                     ssl_connect_2_writing == connssl->connecting_state)))
 642       return retcode;
 643
 644   } /* repeat step2 until all transactions are done. */
 645
 646   if(ssl_connect_3==connssl->connecting_state) {
 647     retcode = polarssl_connect_step3(conn, sockindex);
 648     if(retcode)
 649       return retcode;
 650   }
 651
 652   if(ssl_connect_done==connssl->connecting_state) {
 653     connssl->state = ssl_connection_complete;
 654     conn->recv[sockindex] = polarssl_recv;
 655     conn->send[sockindex] = polarssl_send;
 656     *done = TRUE;
 657   }
 658   else
 659     *done = FALSE;
 660
 661   /* Reset our connect state machine */
 662   connssl->connecting_state = ssl_connect_1;
 663
 664   return CURLE_OK;
 665 }
 666
 667 CURLcode
 668 Curl_polarssl_connect_nonblocking(struct connectdata *conn,
 669                                 int sockindex,
 670                                 bool *done)
 671 {
 672   return polarssl_connect_common(conn, sockindex, TRUE, done);
 673 }
 674
 675
 676 CURLcode
 677 Curl_polarssl_connect(struct connectdata *conn,
 678                     int sockindex)
 679 {
 680   CURLcode retcode;
 681   bool done = FALSE;
 682
 683   retcode = polarssl_connect_common(conn, sockindex, FALSE, &done);
 684   if(retcode)
 685     return retcode;
 686
 687   DEBUGASSERT(done);
 688
 689   return CURLE_OK;
 690 }
 691
 692 /*
 693  * return 0 error initializing SSL
 694  * return 1 SSL initialized successfully
 695  */
 696 int polarssl_init(void)
 697 {
 698   return polarsslthreadlock_thread_setup();
 699 }
 700
 701 void polarssl_cleanup(void)
 702 {
 703   (void)polarsslthreadlock_thread_cleanup();
 704 }
 705
 706 #endif /* USE_POLARSSL */