1 /*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel (at) haxx.se>, et al. 9 * 10 * This software is licensed as described in the file COPYING, which 11 * you should have received as part of this distribution. The terms 12 * are also available at https://curl.haxx.se/docs/copyright.html. 13 * 14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell 15 * copies of the Software, and permit persons to whom the Software is 16 * furnished to do so, under the terms of the COPYING file. 17 * 18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY 19 * KIND, either express or implied. 20 * 21 ***************************************************************************/ 22 23 /* 24 * Source file for all CyaSSL-specific code for the TLS/SSL layer. No code 25 * but vtls.c should ever call or use these functions. 26 * 27 */ 28 29 #include "curl_setup.h" 30 31 #ifdef USE_CYASSL 32 33 #define WOLFSSL_OPTIONS_IGNORE_SYS 34 /* CyaSSL's version.h, which should contain only the version, should come 35 before all other CyaSSL includes and be immediately followed by build config 36 aka options.h. https://curl.haxx.se/mail/lib-2015-04/0069.html */ 37 #include <cyassl/version.h> 38 #if defined(HAVE_CYASSL_OPTIONS_H) && (LIBCYASSL_VERSION_HEX > 0x03004008) 39 #if defined(CYASSL_API) || defined(WOLFSSL_API) 40 /* Safety measure. If either is defined some API include was already included 41 and that's a problem since options.h hasn't been included yet. */ 42 #error "CyaSSL API was included before the CyaSSL build options." 43 #endif 44 #include <cyassl/options.h> 45 #endif 46 47 /* To determine what functions are available we rely on one or both of: 48 - the user's options.h generated by CyaSSL/wolfSSL 49 - the symbols detected by curl's configure 50 Since they are markedly different from one another, and one or the other may 51 not be available, we do some checking below to bring things in sync. */ 52 53 /* HAVE_ALPN is wolfSSL's build time symbol for enabling ALPN in options.h. */ 54 #ifndef HAVE_ALPN 55 #ifdef HAVE_WOLFSSL_USEALPN 56 #define HAVE_ALPN 57 #endif 58 #endif 59 60 /* WOLFSSL_ALLOW_SSLV3 is wolfSSL's build time symbol for enabling SSLv3 in 61 options.h, but is only seen in >= 3.6.6 since that's when they started 62 disabling SSLv3 by default. */ 63 #ifndef WOLFSSL_ALLOW_SSLV3 64 #if (LIBCYASSL_VERSION_HEX < 0x03006006) || \ 65 defined(HAVE_WOLFSSLV3_CLIENT_METHOD) 66 #define WOLFSSL_ALLOW_SSLV3 67 #endif 68 #endif 69 70 #include <limits.h> 71 72 #include "urldata.h" 73 #include "sendf.h" 74 #include "inet_pton.h" 75 #include "vtls.h" 76 #include "parsedate.h" 77 #include "connect.h" /* for the connect timeout */ 78 #include "select.h" 79 #include "strcase.h" 80 #include "x509asn1.h" 81 #include "curl_printf.h" 82 83 #include <cyassl/openssl/ssl.h> 84 #include <cyassl/ssl.h> 85 #ifdef HAVE_CYASSL_ERROR_SSL_H 86 #include <cyassl/error-ssl.h> 87 #else 88 #include <cyassl/error.h> 89 #endif 90 #include <cyassl/ctaocrypt/random.h> 91 #include <cyassl/ctaocrypt/sha256.h> 92 93 #include "cyassl.h" 94 95 /* The last #include files should be: */ 96 #include "curl_memory.h" 97 #include "memdebug.h" 98 99 #if LIBCYASSL_VERSION_HEX < 0x02007002 /* < 2.7.2 */ 100 #define CYASSL_MAX_ERROR_SZ 80 101 #endif 102 103 /* KEEP_PEER_CERT is a product of the presence of build time symbol 104 OPENSSL_EXTRA without NO_CERTS, depending on the version. KEEP_PEER_CERT is 105 in wolfSSL's settings.h, and the latter two are build time symbols in 106 options.h. */ 107 #ifndef KEEP_PEER_CERT 108 #if defined(HAVE_CYASSL_GET_PEER_CERTIFICATE) || \ 109 defined(HAVE_WOLFSSL_GET_PEER_CERTIFICATE) || \ 110 (defined(OPENSSL_EXTRA) && !defined(NO_CERTS)) 111 #define KEEP_PEER_CERT 112 #endif 113 #endif 114 115 struct ssl_backend_data { 116 SSL_CTX* ctx; 117 SSL* handle; 118 }; 119 120 #define BACKEND connssl->backend 121 122 static Curl_recv cyassl_recv; 123 static Curl_send cyassl_send; 124 125 126 static int do_file_type(const char *type) 127 { 128 if(!type || !type[0]) 129 return SSL_FILETYPE_PEM; 130 if(strcasecompare(type, "PEM")) 131 return SSL_FILETYPE_PEM; 132 if(strcasecompare(type, "DER")) 133 return SSL_FILETYPE_ASN1; 134 return -1; 135 } 136 137 /* 138 * This function loads all the client/CA certificates and CRLs. Setup the TLS 139 * layer and do all necessary magic. 140 */ 141 static CURLcode 142 cyassl_connect_step1(struct connectdata *conn, 143 int sockindex) 144 { 145 char error_buffer[CYASSL_MAX_ERROR_SZ]; 146 char *ciphers; 147 struct Curl_easy *data = conn->data; 148 struct ssl_connect_data* connssl = &conn->ssl[sockindex]; 149 SSL_METHOD* req_method = NULL; 150 curl_socket_t sockfd = conn->sock[sockindex]; 151 #ifdef HAVE_SNI 152 bool sni = FALSE; 153 #define use_sni(x) sni = (x) 154 #else 155 #define use_sni(x) Curl_nop_stmt 156 #endif 157 158 if(connssl->state == ssl_connection_complete) 159 return CURLE_OK; 160 161 if(SSL_CONN_CONFIG(version_max) != CURL_SSLVERSION_MAX_NONE) { 162 failf(data, "CyaSSL does not support to set maximum SSL/TLS version"); 163 return CURLE_SSL_CONNECT_ERROR; 164 } 165 166 /* check to see if we've been told to use an explicit SSL/TLS version */ 167 switch(SSL_CONN_CONFIG(version)) { 168 case CURL_SSLVERSION_DEFAULT: 169 case CURL_SSLVERSION_TLSv1: 170 #if LIBCYASSL_VERSION_HEX >= 0x03003000 /* >= 3.3.0 */ 171 /* minimum protocol version is set later after the CTX object is created */ 172 req_method = SSLv23_client_method(); 173 #else 174 infof(data, "CyaSSL <3.3.0 cannot be configured to use TLS 1.0-1.2, " 175 "TLS 1.0 is used exclusively\n"); 176 req_method = TLSv1_client_method(); 177 #endif 178 use_sni(TRUE); 179 break; 180 case CURL_SSLVERSION_TLSv1_0: 181 #ifdef WOLFSSL_ALLOW_TLSV10 182 req_method = TLSv1_client_method(); 183 use_sni(TRUE); 184 #else 185 failf(data, "CyaSSL does not support TLS 1.0"); 186 return CURLE_NOT_BUILT_IN; 187 #endif 188 break; 189 case CURL_SSLVERSION_TLSv1_1: 190 req_method = TLSv1_1_client_method(); 191 use_sni(TRUE); 192 break; 193 case CURL_SSLVERSION_TLSv1_2: 194 req_method = TLSv1_2_client_method(); 195 use_sni(TRUE); 196 break; 197 case CURL_SSLVERSION_TLSv1_3: 198 #ifdef WOLFSSL_TLS13 199 req_method = wolfTLSv1_3_client_method(); 200 use_sni(TRUE); 201 break; 202 #else 203 failf(data, "CyaSSL: TLS 1.3 is not yet supported"); 204 return CURLE_SSL_CONNECT_ERROR; 205 #endif 206 case CURL_SSLVERSION_SSLv3: 207 #ifdef WOLFSSL_ALLOW_SSLV3 208 req_method = SSLv3_client_method(); 209 use_sni(FALSE); 210 #else 211 failf(data, "CyaSSL does not support SSLv3"); 212 return CURLE_NOT_BUILT_IN; 213 #endif 214 break; 215 case CURL_SSLVERSION_SSLv2: 216 failf(data, "CyaSSL does not support SSLv2"); 217 return CURLE_SSL_CONNECT_ERROR; 218 default: 219 failf(data, "Unrecognized parameter passed via CURLOPT_SSLVERSION"); 220 return CURLE_SSL_CONNECT_ERROR; 221 } 222 223 if(!req_method) { 224 failf(data, "SSL: couldn't create a method!"); 225 return CURLE_OUT_OF_MEMORY; 226 } 227 228 if(BACKEND->ctx) 229 SSL_CTX_free(BACKEND->ctx); 230 BACKEND->ctx = SSL_CTX_new(req_method); 231 232 if(!BACKEND->ctx) { 233 failf(data, "SSL: couldn't create a context!"); 234 return CURLE_OUT_OF_MEMORY; 235 } 236 237 switch(SSL_CONN_CONFIG(version)) { 238 case CURL_SSLVERSION_DEFAULT: 239 case CURL_SSLVERSION_TLSv1: 240 #if LIBCYASSL_VERSION_HEX > 0x03004006 /* > 3.4.6 */ 241 /* Versions 3.3.0 to 3.4.6 we know the minimum protocol version is whatever 242 minimum version of TLS was built in and at least TLS 1.0. For later library 243 versions that could change (eg TLS 1.0 built in but defaults to TLS 1.1) so 244 we have this short circuit evaluation to find the minimum supported TLS 245 version. We use wolfSSL_CTX_SetMinVersion and not CyaSSL_SetMinVersion 246 because only the former will work before the user's CTX callback is called. 247 */ 248 if((wolfSSL_CTX_SetMinVersion(BACKEND->ctx, WOLFSSL_TLSV1) != 1) && 249 (wolfSSL_CTX_SetMinVersion(BACKEND->ctx, WOLFSSL_TLSV1_1) != 1) && 250 (wolfSSL_CTX_SetMinVersion(BACKEND->ctx, WOLFSSL_TLSV1_2) != 1) 251 #ifdef WOLFSSL_TLS13 252 && (wolfSSL_CTX_SetMinVersion(BACKEND->ctx, WOLFSSL_TLSV1_3) != 1) 253 #endif 254 ) { 255 failf(data, "SSL: couldn't set the minimum protocol version"); 256 return CURLE_SSL_CONNECT_ERROR; 257 } 258 #endif 259 break; 260 } 261 262 ciphers = SSL_CONN_CONFIG(cipher_list); 263 if(ciphers) { 264 if(!SSL_CTX_set_cipher_list(BACKEND->ctx, ciphers)) { 265 failf(data, "failed setting cipher list: %s", ciphers); 266 return CURLE_SSL_CIPHER; 267 } 268 infof(data, "Cipher selection: %s\n", ciphers); 269 } 270 271 #ifndef NO_FILESYSTEM 272 /* load trusted cacert */ 273 if(SSL_CONN_CONFIG(CAfile)) { 274 if(1 != SSL_CTX_load_verify_locations(BACKEND->ctx, 275 SSL_CONN_CONFIG(CAfile), 276 SSL_CONN_CONFIG(CApath))) { 277 if(SSL_CONN_CONFIG(verifypeer)) { 278 /* Fail if we insist on successfully verifying the server. */ 279 failf(data, "error setting certificate verify locations:\n" 280 " CAfile: %s\n CApath: %s", 281 SSL_CONN_CONFIG(CAfile)? 282 SSL_CONN_CONFIG(CAfile): "none", 283 SSL_CONN_CONFIG(CApath)? 284 SSL_CONN_CONFIG(CApath) : "none"); 285 return CURLE_SSL_CACERT_BADFILE; 286 } 287 else { 288 /* Just continue with a warning if no strict certificate 289 verification is required. */ 290 infof(data, "error setting certificate verify locations," 291 " continuing anyway:\n"); 292 } 293 } 294 else { 295 /* Everything is fine. */ 296 infof(data, "successfully set certificate verify locations:\n"); 297 } 298 infof(data, 299 " CAfile: %s\n" 300 " CApath: %s\n", 301 SSL_CONN_CONFIG(CAfile) ? SSL_CONN_CONFIG(CAfile): 302 "none", 303 SSL_CONN_CONFIG(CApath) ? SSL_CONN_CONFIG(CApath): 304 "none"); 305 } 306 307 /* Load the client certificate, and private key */ 308 if(SSL_SET_OPTION(cert) && SSL_SET_OPTION(key)) { 309 int file_type = do_file_type(SSL_SET_OPTION(cert_type)); 310 311 if(SSL_CTX_use_certificate_file(BACKEND->ctx, SSL_SET_OPTION(cert), 312 file_type) != 1) { 313 failf(data, "unable to use client certificate (no key or wrong pass" 314 " phrase?)"); 315 return CURLE_SSL_CONNECT_ERROR; 316 } 317 318 file_type = do_file_type(SSL_SET_OPTION(key_type)); 319 if(SSL_CTX_use_PrivateKey_file(BACKEND->ctx, SSL_SET_OPTION(key), 320 file_type) != 1) { 321 failf(data, "unable to set private key"); 322 return CURLE_SSL_CONNECT_ERROR; 323 } 324 } 325 #endif /* !NO_FILESYSTEM */ 326 327 /* SSL always tries to verify the peer, this only says whether it should 328 * fail to connect if the verification fails, or if it should continue 329 * anyway. In the latter case the result of the verification is checked with 330 * SSL_get_verify_result() below. */ 331 SSL_CTX_set_verify(BACKEND->ctx, 332 SSL_CONN_CONFIG(verifypeer)?SSL_VERIFY_PEER: 333 SSL_VERIFY_NONE, 334 NULL); 335 336 #ifdef HAVE_SNI 337 if(sni) { 338 struct in_addr addr4; 339 #ifdef ENABLE_IPV6 340 struct in6_addr addr6; 341 #endif 342 const char * const hostname = SSL_IS_PROXY() ? conn->http_proxy.host.name : 343 conn->host.name; 344 size_t hostname_len = strlen(hostname); 345 if((hostname_len < USHRT_MAX) && 346 (0 == Curl_inet_pton(AF_INET, hostname, &addr4)) && 347 #ifdef ENABLE_IPV6 348 (0 == Curl_inet_pton(AF_INET6, hostname, &addr6)) && 349 #endif 350 (CyaSSL_CTX_UseSNI(BACKEND->ctx, CYASSL_SNI_HOST_NAME, hostname, 351 (unsigned short)hostname_len) != 1)) { 352 infof(data, "WARNING: failed to configure server name indication (SNI) " 353 "TLS extension\n"); 354 } 355 } 356 #endif 357 358 /* give application a chance to interfere with SSL set up. */ 359 if(data->set.ssl.fsslctx) { 360 CURLcode result = CURLE_OK; 361 result = (*data->set.ssl.fsslctx)(data, BACKEND->ctx, 362 data->set.ssl.fsslctxp); 363 if(result) { 364 failf(data, "error signaled by ssl ctx callback"); 365 return result; 366 } 367 } 368 #ifdef NO_FILESYSTEM 369 else if(SSL_CONN_CONFIG(verifypeer)) { 370 failf(data, "SSL: Certificates couldn't be loaded because CyaSSL was built" 371 " with \"no filesystem\". Either disable peer verification" 372 " (insecure) or if you are building an application with libcurl you" 373 " can load certificates via CURLOPT_SSL_CTX_FUNCTION."); 374 return CURLE_SSL_CONNECT_ERROR; 375 } 376 #endif 377 378 /* Let's make an SSL structure */ 379 if(BACKEND->handle) 380 SSL_free(BACKEND->handle); 381 BACKEND->handle = SSL_new(BACKEND->ctx); 382 if(!BACKEND->handle) { 383 failf(data, "SSL: couldn't create a context (handle)!"); 384 return CURLE_OUT_OF_MEMORY; 385 } 386 387 #ifdef HAVE_ALPN 388 if(conn->bits.tls_enable_alpn) { 389 char protocols[128]; 390 *protocols = '\0'; 391 392 /* wolfSSL's ALPN protocol name list format is a comma separated string of 393 protocols in descending order of preference, eg: "h2,http/1.1" */ 394 395 #ifdef USE_NGHTTP2 396 if(data->set.httpversion >= CURL_HTTP_VERSION_2) { 397 strcpy(protocols + strlen(protocols), NGHTTP2_PROTO_VERSION_ID ","); 398 infof(data, "ALPN, offering %s\n", NGHTTP2_PROTO_VERSION_ID); 399 } 400 #endif 401 402 strcpy(protocols + strlen(protocols), ALPN_HTTP_1_1); 403 infof(data, "ALPN, offering %s\n", ALPN_HTTP_1_1); 404 405 if(wolfSSL_UseALPN(BACKEND->handle, protocols, 406 (unsigned)strlen(protocols), 407 WOLFSSL_ALPN_CONTINUE_ON_MISMATCH) != SSL_SUCCESS) { 408 failf(data, "SSL: failed setting ALPN protocols"); 409 return CURLE_SSL_CONNECT_ERROR; 410 } 411 } 412 #endif /* HAVE_ALPN */ 413 414 /* Check if there's a cached ID we can/should use here! */ 415 if(SSL_SET_OPTION(primary.sessionid)) { 416 void *ssl_sessionid = NULL; 417 418 Curl_ssl_sessionid_lock(conn); 419 if(!Curl_ssl_getsessionid(conn, &ssl_sessionid, NULL, sockindex)) { 420 /* we got a session id, use it! */ 421 if(!SSL_set_session(BACKEND->handle, ssl_sessionid)) { 422 Curl_ssl_sessionid_unlock(conn); 423 failf(data, "SSL: SSL_set_session failed: %s", 424 ERR_error_string(SSL_get_error(BACKEND->handle, 0), 425 error_buffer)); 426 return CURLE_SSL_CONNECT_ERROR; 427 } 428 /* Informational message */ 429 infof(data, "SSL re-using session ID\n"); 430 } 431 Curl_ssl_sessionid_unlock(conn); 432 } 433 434 /* pass the raw socket into the SSL layer */ 435 if(!SSL_set_fd(BACKEND->handle, (int)sockfd)) { 436 failf(data, "SSL: SSL_set_fd failed"); 437 return CURLE_SSL_CONNECT_ERROR; 438 } 439 440 connssl->connecting_state = ssl_connect_2; 441 return CURLE_OK; 442 } 443 444 445 static CURLcode 446 cyassl_connect_step2(struct connectdata *conn, 447 int sockindex) 448 { 449 int ret = -1; 450 struct Curl_easy *data = conn->data; 451 struct ssl_connect_data* connssl = &conn->ssl[sockindex]; 452 const char * const hostname = SSL_IS_PROXY() ? conn->http_proxy.host.name : 453 conn->host.name; 454 const char * const dispname = SSL_IS_PROXY() ? 455 conn->http_proxy.host.dispname : conn->host.dispname; 456 const char * const pinnedpubkey = SSL_IS_PROXY() ? 457 data->set.str[STRING_SSL_PINNEDPUBLICKEY_PROXY] : 458 data->set.str[STRING_SSL_PINNEDPUBLICKEY_ORIG]; 459 460 conn->recv[sockindex] = cyassl_recv; 461 conn->send[sockindex] = cyassl_send; 462 463 /* Enable RFC2818 checks */ 464 if(SSL_CONN_CONFIG(verifyhost)) { 465 ret = CyaSSL_check_domain_name(BACKEND->handle, hostname); 466 if(ret == SSL_FAILURE) 467 return CURLE_OUT_OF_MEMORY; 468 } 469 470 ret = SSL_connect(BACKEND->handle); 471 if(ret != 1) { 472 char error_buffer[CYASSL_MAX_ERROR_SZ]; 473 int detail = SSL_get_error(BACKEND->handle, ret); 474 475 if(SSL_ERROR_WANT_READ == detail) { 476 connssl->connecting_state = ssl_connect_2_reading; 477 return CURLE_OK; 478 } 479 else if(SSL_ERROR_WANT_WRITE == detail) { 480 connssl->connecting_state = ssl_connect_2_writing; 481 return CURLE_OK; 482 } 483 /* There is no easy way to override only the CN matching. 484 * This will enable the override of both mismatching SubjectAltNames 485 * as also mismatching CN fields */ 486 else if(DOMAIN_NAME_MISMATCH == detail) { 487 #if 1 488 failf(data, "\tsubject alt name(s) or common name do not match \"%s\"\n", 489 dispname); 490 return CURLE_PEER_FAILED_VERIFICATION; 491 #else 492 /* When the CyaSSL_check_domain_name() is used and you desire to continue 493 * on a DOMAIN_NAME_MISMATCH, i.e. 'conn->ssl_config.verifyhost == 0', 494 * CyaSSL version 2.4.0 will fail with an INCOMPLETE_DATA error. The only 495 * way to do this is currently to switch the CyaSSL_check_domain_name() 496 * in and out based on the 'conn->ssl_config.verifyhost' value. */ 497 if(SSL_CONN_CONFIG(verifyhost)) { 498 failf(data, 499 "\tsubject alt name(s) or common name do not match \"%s\"\n", 500 dispname); 501 return CURLE_PEER_FAILED_VERIFICATION; 502 } 503 else { 504 infof(data, 505 "\tsubject alt name(s) and/or common name do not match \"%s\"\n", 506 dispname); 507 return CURLE_OK; 508 } 509 #endif 510 } 511 #if LIBCYASSL_VERSION_HEX >= 0x02007000 /* 2.7.0 */ 512 else if(ASN_NO_SIGNER_E == detail) { 513 if(SSL_CONN_CONFIG(verifypeer)) { 514 failf(data, "\tCA signer not available for verification\n"); 515 return CURLE_SSL_CACERT_BADFILE; 516 } 517 else { 518 /* Just continue with a warning if no strict certificate 519 verification is required. */ 520 infof(data, "CA signer not available for verification, " 521 "continuing anyway\n"); 522 } 523 } 524 #endif 525 else { 526 failf(data, "SSL_connect failed with error %d: %s", detail, 527 ERR_error_string(detail, error_buffer)); 528 return CURLE_SSL_CONNECT_ERROR; 529 } 530 } 531 532 if(pinnedpubkey) { 533 #ifdef KEEP_PEER_CERT 534 X509 *x509; 535 const char *x509_der; 536 int x509_der_len; 537 curl_X509certificate x509_parsed; 538 curl_asn1Element *pubkey; 539 CURLcode result; 540 541 x509 = SSL_get_peer_certificate(BACKEND->handle); 542 if(!x509) { 543 failf(data, "SSL: failed retrieving server certificate"); 544 return CURLE_SSL_PINNEDPUBKEYNOTMATCH; 545 } 546 547 x509_der = (const char *)CyaSSL_X509_get_der(x509, &x509_der_len); 548 if(!x509_der) { 549 failf(data, "SSL: failed retrieving ASN.1 server certificate"); 550 return CURLE_SSL_PINNEDPUBKEYNOTMATCH; 551 } 552 553 memset(&x509_parsed, 0, sizeof(x509_parsed)); 554 if(Curl_parseX509(&x509_parsed, x509_der, x509_der + x509_der_len)) 555 return CURLE_SSL_PINNEDPUBKEYNOTMATCH; 556 557 pubkey = &x509_parsed.subjectPublicKeyInfo; 558 if(!pubkey->header || pubkey->end <= pubkey->header) { 559 failf(data, "SSL: failed retrieving public key from server certificate"); 560 return CURLE_SSL_PINNEDPUBKEYNOTMATCH; 561 } 562 563 result = Curl_pin_peer_pubkey(data, 564 pinnedpubkey, 565 (const unsigned char *)pubkey->header, 566 (size_t)(pubkey->end - pubkey->header)); 567 if(result) { 568 failf(data, "SSL: public key does not match pinned public key!"); 569 return result; 570 } 571 #else 572 failf(data, "Library lacks pinning support built-in"); 573 return CURLE_NOT_BUILT_IN; 574 #endif 575 } 576 577 #ifdef HAVE_ALPN 578 if(conn->bits.tls_enable_alpn) { 579 int rc; 580 char *protocol = NULL; 581 unsigned short protocol_len = 0; 582 583 rc = wolfSSL_ALPN_GetProtocol(BACKEND->handle, &protocol, &protocol_len); 584 585 if(rc == SSL_SUCCESS) { 586 infof(data, "ALPN, server accepted to use %.*s\n", protocol_len, 587 protocol); 588 589 if(protocol_len == ALPN_HTTP_1_1_LENGTH && 590 !memcmp(protocol, ALPN_HTTP_1_1, ALPN_HTTP_1_1_LENGTH)) 591 conn->negnpn = CURL_HTTP_VERSION_1_1; 592 #ifdef USE_NGHTTP2 593 else if(data->set.httpversion >= CURL_HTTP_VERSION_2 && 594 protocol_len == NGHTTP2_PROTO_VERSION_ID_LEN && 595 !memcmp(protocol, NGHTTP2_PROTO_VERSION_ID, 596 NGHTTP2_PROTO_VERSION_ID_LEN)) 597 conn->negnpn = CURL_HTTP_VERSION_2; 598 #endif 599 else 600 infof(data, "ALPN, unrecognized protocol %.*s\n", protocol_len, 601 protocol); 602 } 603 else if(rc == SSL_ALPN_NOT_FOUND) 604 infof(data, "ALPN, server did not agree to a protocol\n"); 605 else { 606 failf(data, "ALPN, failure getting protocol, error %d", rc); 607 return CURLE_SSL_CONNECT_ERROR; 608 } 609 } 610 #endif /* HAVE_ALPN */ 611 612 connssl->connecting_state = ssl_connect_3; 613 #if (LIBCYASSL_VERSION_HEX >= 0x03009010) 614 infof(data, "SSL connection using %s / %s\n", 615 wolfSSL_get_version(BACKEND->handle), 616 wolfSSL_get_cipher_name(BACKEND->handle)); 617 #else 618 infof(data, "SSL connected\n"); 619 #endif 620 621 return CURLE_OK; 622 } 623 624 625 static CURLcode 626 cyassl_connect_step3(struct connectdata *conn, 627 int sockindex) 628 { 629 CURLcode result = CURLE_OK; 630 struct Curl_easy *data = conn->data; 631 struct ssl_connect_data *connssl = &conn->ssl[sockindex]; 632 633 DEBUGASSERT(ssl_connect_3 == connssl->connecting_state); 634 635 if(SSL_SET_OPTION(primary.sessionid)) { 636 bool incache; 637 SSL_SESSION *our_ssl_sessionid; 638 void *old_ssl_sessionid = NULL; 639 640 our_ssl_sessionid = SSL_get_session(BACKEND->handle); 641 642 Curl_ssl_sessionid_lock(conn); 643 incache = !(Curl_ssl_getsessionid(conn, &old_ssl_sessionid, NULL, 644 sockindex)); 645 if(incache) { 646 if(old_ssl_sessionid != our_ssl_sessionid) { 647 infof(data, "old SSL session ID is stale, removing\n"); 648 Curl_ssl_delsessionid(conn, old_ssl_sessionid); 649 incache = FALSE; 650 } 651 } 652 653 if(!incache) { 654 result = Curl_ssl_addsessionid(conn, our_ssl_sessionid, 655 0 /* unknown size */, sockindex); 656 if(result) { 657 Curl_ssl_sessionid_unlock(conn); 658 failf(data, "failed to store ssl session"); 659 return result; 660 } 661 } 662 Curl_ssl_sessionid_unlock(conn); 663 } 664 665 connssl->connecting_state = ssl_connect_done; 666 667 return result; 668 } 669 670 671 static ssize_t cyassl_send(struct connectdata *conn, 672 int sockindex, 673 const void *mem, 674 size_t len, 675 CURLcode *curlcode) 676 { 677 struct ssl_connect_data *connssl = &conn->ssl[sockindex]; 678 char error_buffer[CYASSL_MAX_ERROR_SZ]; 679 int memlen = (len > (size_t)INT_MAX) ? INT_MAX : (int)len; 680 int rc = SSL_write(BACKEND->handle, mem, memlen); 681 682 if(rc < 0) { 683 int err = SSL_get_error(BACKEND->handle, rc); 684 685 switch(err) { 686 case SSL_ERROR_WANT_READ: 687 case SSL_ERROR_WANT_WRITE: 688 /* there's data pending, re-invoke SSL_write() */ 689 *curlcode = CURLE_AGAIN; 690 return -1; 691 default: 692 failf(conn->data, "SSL write: %s, errno %d", 693 ERR_error_string(err, error_buffer), 694 SOCKERRNO); 695 *curlcode = CURLE_SEND_ERROR; 696 return -1; 697 } 698 } 699 return rc; 700 } 701 702 static void Curl_cyassl_close(struct connectdata *conn, int sockindex) 703 { 704 struct ssl_connect_data *connssl = &conn->ssl[sockindex]; 705 706 if(BACKEND->handle) { 707 (void)SSL_shutdown(BACKEND->handle); 708 SSL_free(BACKEND->handle); 709 BACKEND->handle = NULL; 710 } 711 if(BACKEND->ctx) { 712 SSL_CTX_free(BACKEND->ctx); 713 BACKEND->ctx = NULL; 714 } 715 } 716 717 static ssize_t cyassl_recv(struct connectdata *conn, 718 int num, 719 char *buf, 720 size_t buffersize, 721 CURLcode *curlcode) 722 { 723 struct ssl_connect_data *connssl = &conn->ssl[num]; 724 char error_buffer[CYASSL_MAX_ERROR_SZ]; 725 int buffsize = (buffersize > (size_t)INT_MAX) ? INT_MAX : (int)buffersize; 726 int nread = SSL_read(BACKEND->handle, buf, buffsize); 727 728 if(nread < 0) { 729 int err = SSL_get_error(BACKEND->handle, nread); 730 731 switch(err) { 732 case SSL_ERROR_ZERO_RETURN: /* no more data */ 733 break; 734 case SSL_ERROR_WANT_READ: 735 case SSL_ERROR_WANT_WRITE: 736 /* there's data pending, re-invoke SSL_read() */ 737 *curlcode = CURLE_AGAIN; 738 return -1; 739 default: 740 failf(conn->data, "SSL read: %s, errno %d", 741 ERR_error_string(err, error_buffer), 742 SOCKERRNO); 743 *curlcode = CURLE_RECV_ERROR; 744 return -1; 745 } 746 } 747 return nread; 748 } 749 750 751 static void Curl_cyassl_session_free(void *ptr) 752 { 753 (void)ptr; 754 /* CyaSSL reuses sessions on own, no free */ 755 } 756 757 758 static size_t Curl_cyassl_version(char *buffer, size_t size) 759 { 760 #if LIBCYASSL_VERSION_HEX >= 0x03006000 761 return msnprintf(buffer, size, "wolfSSL/%s", wolfSSL_lib_version()); 762 #elif defined(WOLFSSL_VERSION) 763 return msnprintf(buffer, size, "wolfSSL/%s", WOLFSSL_VERSION); 764 #elif defined(CYASSL_VERSION) 765 return msnprintf(buffer, size, "CyaSSL/%s", CYASSL_VERSION); 766 #else 767 return msnprintf(buffer, size, "CyaSSL/%s", "<1.8.8"); 768 #endif 769 } 770 771 772 static int Curl_cyassl_init(void) 773 { 774 return (CyaSSL_Init() == SSL_SUCCESS); 775 } 776 777 778 static void Curl_cyassl_cleanup(void) 779 { 780 CyaSSL_Cleanup(); 781 } 782 783 784 static bool Curl_cyassl_data_pending(const struct connectdata* conn, 785 int connindex) 786 { 787 const struct ssl_connect_data *connssl = &conn->ssl[connindex]; 788 if(BACKEND->handle) /* SSL is in use */ 789 return (0 != SSL_pending(BACKEND->handle)) ? TRUE : FALSE; 790 else 791 return FALSE; 792 } 793 794 795 /* 796 * This function is called to shut down the SSL layer but keep the 797 * socket open (CCC - Clear Command Channel) 798 */ 799 static int Curl_cyassl_shutdown(struct connectdata *conn, int sockindex) 800 { 801 int retval = 0; 802 struct ssl_connect_data *connssl = &conn->ssl[sockindex]; 803 804 if(BACKEND->handle) { 805 SSL_free(BACKEND->handle); 806 BACKEND->handle = NULL; 807 } 808 return retval; 809 } 810 811 812 static CURLcode 813 cyassl_connect_common(struct connectdata *conn, 814 int sockindex, 815 bool nonblocking, 816 bool *done) 817 { 818 CURLcode result; 819 struct Curl_easy *data = conn->data; 820 struct ssl_connect_data *connssl = &conn->ssl[sockindex]; 821 curl_socket_t sockfd = conn->sock[sockindex]; 822 time_t timeout_ms; 823 int what; 824 825 /* check if the connection has already been established */ 826 if(ssl_connection_complete == connssl->state) { 827 *done = TRUE; 828 return CURLE_OK; 829 } 830 831 if(ssl_connect_1 == connssl->connecting_state) { 832 /* Find out how much more time we're allowed */ 833 timeout_ms = Curl_timeleft(data, NULL, TRUE); 834 835 if(timeout_ms < 0) { 836 /* no need to continue if time already is up */ 837 failf(data, "SSL connection timeout"); 838 return CURLE_OPERATION_TIMEDOUT; 839 } 840 841 result = cyassl_connect_step1(conn, sockindex); 842 if(result) 843 return result; 844 } 845 846 while(ssl_connect_2 == connssl->connecting_state || 847 ssl_connect_2_reading == connssl->connecting_state || 848 ssl_connect_2_writing == connssl->connecting_state) { 849 850 /* check allowed time left */ 851 timeout_ms = Curl_timeleft(data, NULL, TRUE); 852 853 if(timeout_ms < 0) { 854 /* no need to continue if time already is up */ 855 failf(data, "SSL connection timeout"); 856 return CURLE_OPERATION_TIMEDOUT; 857 } 858 859 /* if ssl is expecting something, check if it's available. */ 860 if(connssl->connecting_state == ssl_connect_2_reading 861 || connssl->connecting_state == ssl_connect_2_writing) { 862 863 curl_socket_t writefd = ssl_connect_2_writing == 864 connssl->connecting_state?sockfd:CURL_SOCKET_BAD; 865 curl_socket_t readfd = ssl_connect_2_reading == 866 connssl->connecting_state?sockfd:CURL_SOCKET_BAD; 867 868 what = Curl_socket_check(readfd, CURL_SOCKET_BAD, writefd, 869 nonblocking?0:timeout_ms); 870 if(what < 0) { 871 /* fatal error */ 872 failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO); 873 return CURLE_SSL_CONNECT_ERROR; 874 } 875 else if(0 == what) { 876 if(nonblocking) { 877 *done = FALSE; 878 return CURLE_OK; 879 } 880 else { 881 /* timeout */ 882 failf(data, "SSL connection timeout"); 883 return CURLE_OPERATION_TIMEDOUT; 884 } 885 } 886 /* socket is readable or writable */ 887 } 888 889 /* Run transaction, and return to the caller if it failed or if 890 * this connection is part of a multi handle and this loop would 891 * execute again. This permits the owner of a multi handle to 892 * abort a connection attempt before step2 has completed while 893 * ensuring that a client using select() or epoll() will always 894 * have a valid fdset to wait on. 895 */ 896 result = cyassl_connect_step2(conn, sockindex); 897 if(result || (nonblocking && 898 (ssl_connect_2 == connssl->connecting_state || 899 ssl_connect_2_reading == connssl->connecting_state || 900 ssl_connect_2_writing == connssl->connecting_state))) 901 return result; 902 } /* repeat step2 until all transactions are done. */ 903 904 if(ssl_connect_3 == connssl->connecting_state) { 905 result = cyassl_connect_step3(conn, sockindex); 906 if(result) 907 return result; 908 } 909 910 if(ssl_connect_done == connssl->connecting_state) { 911 connssl->state = ssl_connection_complete; 912 conn->recv[sockindex] = cyassl_recv; 913 conn->send[sockindex] = cyassl_send; 914 *done = TRUE; 915 } 916 else 917 *done = FALSE; 918 919 /* Reset our connect state machine */ 920 connssl->connecting_state = ssl_connect_1; 921 922 return CURLE_OK; 923 } 924 925 926 static CURLcode Curl_cyassl_connect_nonblocking(struct connectdata *conn, 927 int sockindex, bool *done) 928 { 929 return cyassl_connect_common(conn, sockindex, TRUE, done); 930 } 931 932 933 static CURLcode Curl_cyassl_connect(struct connectdata *conn, int sockindex) 934 { 935 CURLcode result; 936 bool done = FALSE; 937 938 result = cyassl_connect_common(conn, sockindex, FALSE, &done); 939 if(result) 940 return result; 941 942 DEBUGASSERT(done); 943 944 return CURLE_OK; 945 } 946 947 static CURLcode Curl_cyassl_random(struct Curl_easy *data, 948 unsigned char *entropy, size_t length) 949 { 950 RNG rng; 951 (void)data; 952 if(InitRng(&rng)) 953 return CURLE_FAILED_INIT; 954 if(length > UINT_MAX) 955 return CURLE_FAILED_INIT; 956 if(RNG_GenerateBlock(&rng, entropy, (unsigned)length)) 957 return CURLE_FAILED_INIT; 958 if(FreeRng(&rng)) 959 return CURLE_FAILED_INIT; 960 return CURLE_OK; 961 } 962 963 static CURLcode Curl_cyassl_sha256sum(const unsigned char *tmp, /* input */ 964 size_t tmplen, 965 unsigned char *sha256sum /* output */, 966 size_t unused) 967 { 968 Sha256 SHA256pw; 969 (void)unused; 970 InitSha256(&SHA256pw); 971 Sha256Update(&SHA256pw, tmp, (word32)tmplen); 972 Sha256Final(&SHA256pw, sha256sum); 973 return CURLE_OK; 974 } 975 976 static void *Curl_cyassl_get_internals(struct ssl_connect_data *connssl, 977 CURLINFO info UNUSED_PARAM) 978 { 979 (void)info; 980 return BACKEND->handle; 981 } 982 983 const struct Curl_ssl Curl_ssl_cyassl = { 984 { CURLSSLBACKEND_WOLFSSL, "WolfSSL" }, /* info */ 985 986 #ifdef KEEP_PEER_CERT 987 SSLSUPP_PINNEDPUBKEY | 988 #endif 989 SSLSUPP_SSL_CTX, 990 991 sizeof(struct ssl_backend_data), 992 993 Curl_cyassl_init, /* init */ 994 Curl_cyassl_cleanup, /* cleanup */ 995 Curl_cyassl_version, /* version */ 996 Curl_none_check_cxn, /* check_cxn */ 997 Curl_cyassl_shutdown, /* shutdown */ 998 Curl_cyassl_data_pending, /* data_pending */ 999 Curl_cyassl_random, /* random */ 1000 Curl_none_cert_status_request, /* cert_status_request */ 1001 Curl_cyassl_connect, /* connect */ 1002 Curl_cyassl_connect_nonblocking, /* connect_nonblocking */ 1003 Curl_cyassl_get_internals, /* get_internals */ 1004 Curl_cyassl_close, /* close_one */ 1005 Curl_none_close_all, /* close_all */ 1006 Curl_cyassl_session_free, /* session_free */ 1007 Curl_none_set_engine, /* set_engine */ 1008 Curl_none_set_engine_default, /* set_engine_default */ 1009 Curl_none_engines_list, /* engines_list */ 1010 Curl_none_false_start, /* false_start */ 1011 Curl_none_md5sum, /* md5sum */ 1012 Curl_cyassl_sha256sum /* sha256sum */ 1013 }; 1014 1015 #endif 1016
