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   errorbuf[0]=0;
 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   if(data->set.str[STRING_SSL_CAPATH]) {
 205     ret = x509_crt_parse_path(&connssl->cacert,
 206                               data->set.str[STRING_SSL_CAPATH]);
 207
 208     if(ret<0) {
 209 #ifdef POLARSSL_ERROR_C
 210       error_strerror(ret, errorbuf, sizeof(errorbuf));
 211 #endif /* POLARSSL_ERROR_C */
 212       failf(data, "Error reading ca cert path %s - PolarSSL: (-0x%04X) %s",
 213             data->set.str[STRING_SSL_CAPATH], -ret, errorbuf);
 214
 215       if(data->set.ssl.verifypeer)
 216         return CURLE_SSL_CACERT_BADFILE;
 217     }
 218   }
 219
 220   /* Load the client certificate */
 221   memset(&connssl->clicert, 0, sizeof(x509_crt));
 222
 223   if(data->set.str[STRING_CERT]) {
 224     ret = x509_crt_parse_file(&connssl->clicert,
 225                               data->set.str[STRING_CERT]);
 226
 227     if(ret) {
 228 #ifdef POLARSSL_ERROR_C
 229       error_strerror(ret, errorbuf, sizeof(errorbuf));
 230 #endif /* POLARSSL_ERROR_C */
 231       failf(data, "Error reading client cert file %s - PolarSSL: (-0x%04X) %s",
 232             data->set.str[STRING_CERT], -ret, errorbuf);
 233
 234       return CURLE_SSL_CERTPROBLEM;
 235     }
 236   }
 237
 238   /* Load the client private key */
 239   if(data->set.str[STRING_KEY]) {
 240     pk_context pk;
 241     pk_init(&pk);
 242     ret = pk_parse_keyfile(&pk, data->set.str[STRING_KEY],
 243                            data->set.str[STRING_KEY_PASSWD]);
 244     if(ret == 0 && !pk_can_do(&pk, POLARSSL_PK_RSA))
 245       ret = POLARSSL_ERR_PK_TYPE_MISMATCH;
 246     if(ret == 0)
 247       rsa_copy(&connssl->rsa, pk_rsa(pk));
 248     else
 249       rsa_free(&connssl->rsa);
 250     pk_free(&pk);
 251
 252     if(ret) {
 253 #ifdef POLARSSL_ERROR_C
 254       error_strerror(ret, errorbuf, sizeof(errorbuf));
 255 #endif /* POLARSSL_ERROR_C */
 256       failf(data, "Error reading private key %s - PolarSSL: (-0x%04X) %s",
 257             data->set.str[STRING_KEY], -ret, errorbuf);
 258
 259       return CURLE_SSL_CERTPROBLEM;
 260     }
 261   }
 262
 263   /* Load the CRL */
 264   memset(&connssl->crl, 0, sizeof(x509_crl));
 265
 266   if(data->set.str[STRING_SSL_CRLFILE]) {
 267     ret = x509_crl_parse_file(&connssl->crl,
 268                               data->set.str[STRING_SSL_CRLFILE]);
 269
 270     if(ret) {
 271 #ifdef POLARSSL_ERROR_C
 272       error_strerror(ret, errorbuf, sizeof(errorbuf));
 273 #endif /* POLARSSL_ERROR_C */
 274       failf(data, "Error reading CRL file %s - PolarSSL: (-0x%04X) %s",
 275             data->set.str[STRING_SSL_CRLFILE], -ret, errorbuf);
 276
 277       return CURLE_SSL_CRL_BADFILE;
 278     }
 279   }
 280
 281   infof(data, "PolarSSL: Connecting to %s:%d\n",
 282         conn->host.name, conn->remote_port);
 283
 284   if(ssl_init(&connssl->ssl)) {
 285     failf(data, "PolarSSL: ssl_init failed");
 286     return CURLE_SSL_CONNECT_ERROR;
 287   }
 288
 289   switch(data->set.ssl.version) {
 290   default:
 291   case CURL_SSLVERSION_DEFAULT:
 292     ssl_set_min_version(&connssl->ssl, SSL_MAJOR_VERSION_3,
 293                         SSL_MINOR_VERSION_1);
 294     break;
 295   case CURL_SSLVERSION_SSLv3:
 296     ssl_set_min_version(&connssl->ssl, SSL_MAJOR_VERSION_3,
 297                         SSL_MINOR_VERSION_0);
 298     infof(data, "PolarSSL: Forced min. SSL Version to be SSLv3\n");
 299     break;
 300   case CURL_SSLVERSION_TLSv1_0:
 301     ssl_set_min_version(&connssl->ssl, SSL_MAJOR_VERSION_3,
 302                         SSL_MINOR_VERSION_1);
 303     infof(data, "PolarSSL: Forced min. SSL Version to be TLS 1.0\n");
 304     break;
 305   case CURL_SSLVERSION_TLSv1_1:
 306     ssl_set_min_version(&connssl->ssl, SSL_MAJOR_VERSION_3,
 307                         SSL_MINOR_VERSION_2);
 308     infof(data, "PolarSSL: Forced min. SSL Version to be TLS 1.1\n");
 309     break;
 310   case CURL_SSLVERSION_TLSv1_2:
 311     ssl_set_min_version(&connssl->ssl, SSL_MAJOR_VERSION_3,
 312                         SSL_MINOR_VERSION_3);
 313     infof(data, "PolarSSL: Forced min. SSL Version to be TLS 1.2\n");
 314     break;
 315   }
 316
 317   ssl_set_endpoint(&connssl->ssl, SSL_IS_CLIENT);
 318   ssl_set_authmode(&connssl->ssl, SSL_VERIFY_OPTIONAL);
 319
 320   ssl_set_rng(&connssl->ssl, ctr_drbg_random,
 321               &connssl->ctr_drbg);
 322   ssl_set_bio(&connssl->ssl,
 323               net_recv, &conn->sock[sockindex],
 324               net_send, &conn->sock[sockindex]);
 325
 326   ssl_set_ciphersuites(&connssl->ssl, ssl_list_ciphersuites());
 327   if(!Curl_ssl_getsessionid(conn, &old_session, &old_session_size)) {
 328     memcpy(&connssl->ssn, old_session, old_session_size);
 329     infof(data, "PolarSSL re-using session\n");
 330   }
 331
 332   ssl_set_session(&connssl->ssl,
 333                   &connssl->ssn);
 334
 335   ssl_set_ca_chain(&connssl->ssl,
 336                    &connssl->cacert,
 337                    &connssl->crl,
 338                    conn->host.name);
 339
 340   ssl_set_own_cert_rsa(&connssl->ssl,
 341                        &connssl->clicert, &connssl->rsa);
 342
 343   if(!Curl_inet_pton(AF_INET, conn->host.name, &addr) &&
 344 #ifdef ENABLE_IPV6
 345      !Curl_inet_pton(AF_INET6, conn->host.name, &addr) &&
 346 #endif
 347      sni && ssl_set_hostname(&connssl->ssl, conn->host.name)) {
 348      infof(data, "WARNING: failed to configure "
 349                  "server name indication (SNI) TLS extension\n");
 350   }
 351
 352 #ifdef HAS_ALPN
 353   if(data->set.httpversion == CURL_HTTP_VERSION_2_0) {
 354     if(data->set.ssl_enable_alpn) {
 355       static const char* protocols[] = {
 356         NGHTTP2_PROTO_VERSION_ID, ALPN_HTTP_1_1, NULL
 357       };
 358       ssl_set_alpn_protocols(&connssl->ssl, protocols);
 359       infof(data, "ALPN, offering %s, %s\n", protocols[0],
 360             protocols[1]);
 361       connssl->asked_for_h2 = TRUE;
 362     }
 363   }
 364 #endif
 365
 366 #ifdef POLARSSL_DEBUG
 367   ssl_set_dbg(&connssl->ssl, polarssl_debug, data);
 368 #endif
 369
 370   connssl->connecting_state = ssl_connect_2;
 371
 372   return CURLE_OK;
 373 }
 374
 375 static CURLcode
 376 polarssl_connect_step2(struct connectdata *conn,
 377                      int sockindex)
 378 {
 379   int ret;
 380   struct SessionHandle *data = conn->data;
 381   struct ssl_connect_data* connssl = &conn->ssl[sockindex];
 382   char buffer[1024];
 383
 384 #ifdef HAS_ALPN
 385   const char* next_protocol;
 386 #endif
 387
 388   char errorbuf[128];
 389   errorbuf[0] = 0;
 390
 391   conn->recv[sockindex] = polarssl_recv;
 392   conn->send[sockindex] = polarssl_send;
 393
 394   for(;;) {
 395     if(!(ret = ssl_handshake(&connssl->ssl)))
 396       break;
 397     else if(ret != POLARSSL_ERR_NET_WANT_READ &&
 398             ret != POLARSSL_ERR_NET_WANT_WRITE) {
 399 #ifdef POLARSSL_ERROR_C
 400      error_strerror(ret, errorbuf, sizeof(errorbuf));
 401 #endif /* POLARSSL_ERROR_C */
 402      failf(data, "ssl_handshake returned - PolarSSL: (-0x%04X) %s",
 403                                                     -ret, errorbuf);
 404
 405      return CURLE_SSL_CONNECT_ERROR;
 406     }
 407     else {
 408       if(ret == POLARSSL_ERR_NET_WANT_READ) {
 409         connssl->connecting_state = ssl_connect_2_reading;
 410         return CURLE_OK;
 411       }
 412       if(ret == POLARSSL_ERR_NET_WANT_WRITE) {
 413         connssl->connecting_state = ssl_connect_2_writing;
 414         return CURLE_OK;
 415       }
 416       failf(data, "SSL_connect failed with error %d.", ret);
 417       return CURLE_SSL_CONNECT_ERROR;
 418
 419     }
 420   }
 421
 422   infof(data, "PolarSSL: Handshake complete, cipher is %s\n",
 423         ssl_get_ciphersuite(&conn->ssl[sockindex].ssl)
 424     );
 425
 426   ret = ssl_get_verify_result(&conn->ssl[sockindex].ssl);
 427
 428   if(ret && data->set.ssl.verifypeer) {
 429     if(ret & BADCERT_EXPIRED)
 430       failf(data, "Cert verify failed: BADCERT_EXPIRED");
 431
 432     if(ret & BADCERT_REVOKED) {
 433       failf(data, "Cert verify failed: BADCERT_REVOKED");
 434       return CURLE_SSL_CACERT;
 435     }
 436
 437     if(ret & BADCERT_CN_MISMATCH)
 438       failf(data, "Cert verify failed: BADCERT_CN_MISMATCH");
 439
 440     if(ret & BADCERT_NOT_TRUSTED)
 441       failf(data, "Cert verify failed: BADCERT_NOT_TRUSTED");
 442
 443     return CURLE_PEER_FAILED_VERIFICATION;
 444   }
 445
 446   if(ssl_get_peer_cert(&(connssl->ssl))) {
 447     /* If the session was resumed, there will be no peer certs */
 448     memset(buffer, 0, sizeof(buffer));
 449
 450     if(x509_crt_info(buffer, sizeof(buffer), (char *)"* ",
 451                      ssl_get_peer_cert(&(connssl->ssl))) != -1)
 452       infof(data, "Dumping cert info:\n%s\n", buffer);
 453   }
 454
 455 #ifdef HAS_ALPN
 456   if(data->set.ssl_enable_alpn) {
 457     next_protocol = ssl_get_alpn_protocol(&connssl->ssl);
 458
 459     if(next_protocol != NULL) {
 460       infof(data, "ALPN, server accepted to use %s\n", next_protocol);
 461
 462       if(strncmp(next_protocol, NGHTTP2_PROTO_VERSION_ID,
 463                   NGHTTP2_PROTO_VERSION_ID_LEN)) {
 464         conn->negnpn = NPN_HTTP2;
 465       }
 466       else if(strncmp(next_protocol, ALPN_HTTP_1_1, ALPN_HTTP_1_1_LENGTH)) {
 467         conn->negnpn = NPN_HTTP1_1;
 468       }
 469     }
 470     else if(connssl->asked_for_h2) {
 471       infof(data, "ALPN, server did not agree to a protocol\n");
 472     }
 473   }
 474 #endif
 475
 476   connssl->connecting_state = ssl_connect_3;
 477   infof(data, "SSL connected\n");
 478
 479   return CURLE_OK;
 480 }
 481
 482 static CURLcode
 483 polarssl_connect_step3(struct connectdata *conn,
 484                      int sockindex)
 485 {
 486   CURLcode result = CURLE_OK;
 487   struct ssl_connect_data *connssl = &conn->ssl[sockindex];
 488   struct SessionHandle *data = conn->data;
 489   void *old_ssl_sessionid = NULL;
 490   ssl_session *our_ssl_sessionid = &conn->ssl[sockindex].ssn ;
 491   bool incache;
 492
 493   DEBUGASSERT(ssl_connect_3 == connssl->connecting_state);
 494
 495   /* Save the current session data for possible re-use */
 496   incache = !(Curl_ssl_getsessionid(conn, &old_ssl_sessionid, NULL));
 497   if(incache) {
 498     if(old_ssl_sessionid != our_ssl_sessionid) {
 499       infof(data, "old SSL session ID is stale, removing\n");
 500       Curl_ssl_delsessionid(conn, old_ssl_sessionid);
 501       incache = FALSE;
 502     }
 503   }
 504
 505   if(!incache) {
 506     void *new_session = malloc(sizeof(ssl_session));
 507
 508     if(new_session) {
 509       memcpy(new_session, our_ssl_sessionid, sizeof(ssl_session));
 510
 511       result = Curl_ssl_addsessionid(conn, new_session, sizeof(ssl_session));
 512     }
 513     else
 514       result = CURLE_OUT_OF_MEMORY;
 515
 516     if(result) {
 517       failf(data, "failed to store ssl session");
 518       return result;
 519     }
 520   }
 521
 522   connssl->connecting_state = ssl_connect_done;
 523
 524   return CURLE_OK;
 525 }
 526
 527 static ssize_t polarssl_send(struct connectdata *conn,
 528                              int sockindex,
 529                              const void *mem,
 530                              size_t len,
 531                              CURLcode *curlcode)
 532 {
 533   int ret = -1;
 534
 535   ret = ssl_write(&conn->ssl[sockindex].ssl,
 536                   (unsigned char *)mem, len);
 537
 538   if(ret < 0) {
 539     *curlcode = (ret == POLARSSL_ERR_NET_WANT_WRITE) ?
 540       CURLE_AGAIN : CURLE_SEND_ERROR;
 541     ret = -1;
 542   }
 543
 544   return ret;
 545 }
 546
 547 void Curl_polarssl_close_all(struct SessionHandle *data)
 548 {
 549   (void)data;
 550 }
 551
 552 void Curl_polarssl_close(struct connectdata *conn, int sockindex)
 553 {
 554   rsa_free(&conn->ssl[sockindex].rsa);
 555   x509_crt_free(&conn->ssl[sockindex].clicert);
 556   x509_crt_free(&conn->ssl[sockindex].cacert);
 557   x509_crl_free(&conn->ssl[sockindex].crl);
 558   ssl_free(&conn->ssl[sockindex].ssl);
 559 }
 560
 561 static ssize_t polarssl_recv(struct connectdata *conn,
 562                              int num,
 563                              char *buf,
 564                              size_t buffersize,
 565                              CURLcode *curlcode)
 566 {
 567   int ret = -1;
 568   ssize_t len = -1;
 569
 570   memset(buf, 0, buffersize);
 571   ret = ssl_read(&conn->ssl[num].ssl, (unsigned char *)buf, buffersize);
 572
 573   if(ret <= 0) {
 574     if(ret == POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY)
 575       return 0;
 576
 577     *curlcode = (ret == POLARSSL_ERR_NET_WANT_READ) ?
 578       CURLE_AGAIN : CURLE_RECV_ERROR;
 579     return -1;
 580   }
 581
 582   len = ret;
 583
 584   return len;
 585 }
 586
 587 void Curl_polarssl_session_free(void *ptr)
 588 {
 589   free(ptr);
 590 }
 591
 592 size_t Curl_polarssl_version(char *buffer, size_t size)
 593 {
 594   unsigned int version = version_get_number();
 595   return snprintf(buffer, size, "PolarSSL/%d.%d.%d", version>>24,
 596                   (version>>16)&0xff, (version>>8)&0xff);
 597 }
 598
 599 static CURLcode
 600 polarssl_connect_common(struct connectdata *conn,
 601                         int sockindex,
 602                         bool nonblocking,
 603                         bool *done)
 604 {
 605   CURLcode result;
 606   struct SessionHandle *data = conn->data;
 607   struct ssl_connect_data *connssl = &conn->ssl[sockindex];
 608   curl_socket_t sockfd = conn->sock[sockindex];
 609   long timeout_ms;
 610   int what;
 611
 612   /* check if the connection has already been established */
 613   if(ssl_connection_complete == connssl->state) {
 614     *done = TRUE;
 615     return CURLE_OK;
 616   }
 617
 618   if(ssl_connect_1 == connssl->connecting_state) {
 619     /* Find out how much more time we're allowed */
 620     timeout_ms = Curl_timeleft(data, NULL, TRUE);
 621
 622     if(timeout_ms < 0) {
 623       /* no need to continue if time already is up */
 624       failf(data, "SSL connection timeout");
 625       return CURLE_OPERATION_TIMEDOUT;
 626     }
 627
 628     result = polarssl_connect_step1(conn, sockindex);
 629     if(result)
 630       return result;
 631   }
 632
 633   while(ssl_connect_2 == connssl->connecting_state ||
 634         ssl_connect_2_reading == connssl->connecting_state ||
 635         ssl_connect_2_writing == connssl->connecting_state) {
 636
 637     /* check allowed time left */
 638     timeout_ms = Curl_timeleft(data, NULL, TRUE);
 639
 640     if(timeout_ms < 0) {
 641       /* no need to continue if time already is up */
 642       failf(data, "SSL connection timeout");
 643       return CURLE_OPERATION_TIMEDOUT;
 644     }
 645
 646     /* if ssl is expecting something, check if it's available. */
 647     if(connssl->connecting_state == ssl_connect_2_reading ||
 648        connssl->connecting_state == ssl_connect_2_writing) {
 649
 650       curl_socket_t writefd = ssl_connect_2_writing==
 651         connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
 652       curl_socket_t readfd = ssl_connect_2_reading==
 653         connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
 654
 655       what = Curl_socket_ready(readfd, writefd, nonblocking?0:timeout_ms);
 656       if(what < 0) {
 657         /* fatal error */
 658         failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
 659         return CURLE_SSL_CONNECT_ERROR;
 660       }
 661       else if(0 == what) {
 662         if(nonblocking) {
 663           *done = FALSE;
 664           return CURLE_OK;
 665         }
 666         else {
 667           /* timeout */
 668           failf(data, "SSL connection timeout");
 669           return CURLE_OPERATION_TIMEDOUT;
 670         }
 671       }
 672       /* socket is readable or writable */
 673     }
 674
 675     /* Run transaction, and return to the caller if it failed or if
 676      * this connection is part of a multi handle and this loop would
 677      * execute again. This permits the owner of a multi handle to
 678      * abort a connection attempt before step2 has completed while
 679      * ensuring that a client using select() or epoll() will always
 680      * have a valid fdset to wait on.
 681      */
 682     result = polarssl_connect_step2(conn, sockindex);
 683     if(result || (nonblocking &&
 684                   (ssl_connect_2 == connssl->connecting_state ||
 685                    ssl_connect_2_reading == connssl->connecting_state ||
 686                    ssl_connect_2_writing == connssl->connecting_state)))
 687       return result;
 688
 689   } /* repeat step2 until all transactions are done. */
 690
 691   if(ssl_connect_3 == connssl->connecting_state) {
 692     result = polarssl_connect_step3(conn, sockindex);
 693     if(result)
 694       return result;
 695   }
 696
 697   if(ssl_connect_done == connssl->connecting_state) {
 698     connssl->state = ssl_connection_complete;
 699     conn->recv[sockindex] = polarssl_recv;
 700     conn->send[sockindex] = polarssl_send;
 701     *done = TRUE;
 702   }
 703   else
 704     *done = FALSE;
 705
 706   /* Reset our connect state machine */
 707   connssl->connecting_state = ssl_connect_1;
 708
 709   return CURLE_OK;
 710 }
 711
 712 CURLcode
 713 Curl_polarssl_connect_nonblocking(struct connectdata *conn,
 714                                 int sockindex,
 715                                 bool *done)
 716 {
 717   return polarssl_connect_common(conn, sockindex, TRUE, done);
 718 }
 719
 720
 721 CURLcode
 722 Curl_polarssl_connect(struct connectdata *conn,
 723                     int sockindex)
 724 {
 725   CURLcode result;
 726   bool done = FALSE;
 727
 728   result = polarssl_connect_common(conn, sockindex, FALSE, &done);
 729   if(result)
 730     return result;
 731
 732   DEBUGASSERT(done);
 733
 734   return CURLE_OK;
 735 }
 736
 737 /*
 738  * return 0 error initializing SSL
 739  * return 1 SSL initialized successfully
 740  */
 741 int polarssl_init(void)
 742 {
 743   return polarsslthreadlock_thread_setup();
 744 }
 745
 746 void polarssl_cleanup(void)
 747 {
 748   (void)polarsslthreadlock_thread_cleanup();
 749 }
 750
 751 #endif /* USE_POLARSSL */