/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 2010 - 2011, Hoi-Ho Chan, * Copyright (C) 2012 - 2015, Daniel Stenberg, , et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms * are also available at http://curl.haxx.se/docs/copyright.html. * * You may opt to use, copy, modify, merge, publish, distribute and/or sell * copies of the Software, and permit persons to whom the Software is * furnished to do so, under the terms of the COPYING file. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ***************************************************************************/ /* * Source file for all PolarSSL-specific code for the TLS/SSL layer. No code * but vtls.c should ever call or use these functions. * */ #include "curl_setup.h" #ifdef USE_POLARSSL #include #include #include #include #include #if POLARSSL_VERSION_NUMBER < 0x01030000 #error too old PolarSSL #endif #include #include #include #include "urldata.h" #include "sendf.h" #include "inet_pton.h" #include "polarssl.h" #include "vtls.h" #include "parsedate.h" #include "connect.h" /* for the connect timeout */ #include "select.h" #include "rawstr.h" #include "polarssl_threadlock.h" #include "curl_printf.h" #include "curl_memory.h" /* The last #include file should be: */ #include "memdebug.h" /* apply threading? */ #if defined(USE_THREADS_POSIX) || defined(USE_THREADS_WIN32) #define THREADING_SUPPORT #endif #if defined(THREADING_SUPPORT) static entropy_context entropy; static int entropy_init_initialized = 0; /* start of entropy_init_mutex() */ static void entropy_init_mutex(entropy_context *ctx) { /* lock 0 = entropy_init_mutex() */ polarsslthreadlock_lock_function(0); if(entropy_init_initialized == 0) { entropy_init(ctx); entropy_init_initialized = 1; } polarsslthreadlock_unlock_function(0); } /* end of entropy_init_mutex() */ /* start of entropy_func_mutex() */ static int entropy_func_mutex(void *data, unsigned char *output, size_t len) { int ret; /* lock 1 = entropy_func_mutex() */ polarsslthreadlock_lock_function(1); ret = entropy_func(data, output, len); polarsslthreadlock_unlock_function(1); return ret; } /* end of entropy_func_mutex() */ #endif /* THREADING_SUPPORT */ /* Define this to enable lots of debugging for PolarSSL */ #undef POLARSSL_DEBUG #ifdef POLARSSL_DEBUG static void polarssl_debug(void *context, int level, const char *line) { struct SessionHandle *data = NULL; if(!context) return; data = (struct SessionHandle *)context; infof(data, "%s", line); (void) level; } #else #endif /* ALPN for http2? */ #ifdef POLARSSL_SSL_ALPN # define HAS_ALPN #endif static Curl_recv polarssl_recv; static Curl_send polarssl_send; static CURLcode polarssl_connect_step1(struct connectdata *conn, int sockindex) { struct SessionHandle *data = conn->data; struct ssl_connect_data* connssl = &conn->ssl[sockindex]; bool sni = TRUE; /* default is SNI enabled */ int ret = -1; #ifdef ENABLE_IPV6 struct in6_addr addr; #else struct in_addr addr; #endif void *old_session = NULL; size_t old_session_size = 0; char errorbuf[128]; errorbuf[0]=0; /* PolarSSL only supports SSLv3 and TLSv1 */ if(data->set.ssl.version == CURL_SSLVERSION_SSLv2) { failf(data, "PolarSSL does not support SSLv2"); return CURLE_SSL_CONNECT_ERROR; } else if(data->set.ssl.version == CURL_SSLVERSION_SSLv3) sni = FALSE; /* SSLv3 has no SNI */ #ifdef THREADING_SUPPORT entropy_init_mutex(&entropy); if((ret = ctr_drbg_init(&connssl->ctr_drbg, entropy_func_mutex, &entropy, connssl->ssn.id, connssl->ssn.length)) != 0) { #ifdef POLARSSL_ERROR_C error_strerror(ret, errorbuf, sizeof(errorbuf)); #endif /* POLARSSL_ERROR_C */ failf(data, "Failed - PolarSSL: ctr_drbg_init returned (-0x%04X) %s\n", -ret, errorbuf); } #else entropy_init(&connssl->entropy); if((ret = ctr_drbg_init(&connssl->ctr_drbg, entropy_func, &connssl->entropy, connssl->ssn.id, connssl->ssn.length)) != 0) { #ifdef POLARSSL_ERROR_C error_strerror(ret, errorbuf, sizeof(errorbuf)); #endif /* POLARSSL_ERROR_C */ failf(data, "Failed - PolarSSL: ctr_drbg_init returned (-0x%04X) %s\n", -ret, errorbuf); } #endif /* THREADING_SUPPORT */ /* Load the trusted CA */ memset(&connssl->cacert, 0, sizeof(x509_crt)); if(data->set.str[STRING_SSL_CAFILE]) { ret = x509_crt_parse_file(&connssl->cacert, data->set.str[STRING_SSL_CAFILE]); if(ret<0) { #ifdef POLARSSL_ERROR_C error_strerror(ret, errorbuf, sizeof(errorbuf)); #endif /* POLARSSL_ERROR_C */ failf(data, "Error reading ca cert file %s - PolarSSL: (-0x%04X) %s", data->set.str[STRING_SSL_CAFILE], -ret, errorbuf); if(data->set.ssl.verifypeer) return CURLE_SSL_CACERT_BADFILE; } } if(data->set.str[STRING_SSL_CAPATH]) { ret = x509_crt_parse_path(&connssl->cacert, data->set.str[STRING_SSL_CAPATH]); if(ret<0) { #ifdef POLARSSL_ERROR_C error_strerror(ret, errorbuf, sizeof(errorbuf)); #endif /* POLARSSL_ERROR_C */ failf(data, "Error reading ca cert path %s - PolarSSL: (-0x%04X) %s", data->set.str[STRING_SSL_CAPATH], -ret, errorbuf); if(data->set.ssl.verifypeer) return CURLE_SSL_CACERT_BADFILE; } } /* Load the client certificate */ memset(&connssl->clicert, 0, sizeof(x509_crt)); if(data->set.str[STRING_CERT]) { ret = x509_crt_parse_file(&connssl->clicert, data->set.str[STRING_CERT]); if(ret) { #ifdef POLARSSL_ERROR_C error_strerror(ret, errorbuf, sizeof(errorbuf)); #endif /* POLARSSL_ERROR_C */ failf(data, "Error reading client cert file %s - PolarSSL: (-0x%04X) %s", data->set.str[STRING_CERT], -ret, errorbuf); return CURLE_SSL_CERTPROBLEM; } } /* Load the client private key */ if(data->set.str[STRING_KEY]) { pk_context pk; pk_init(&pk); ret = pk_parse_keyfile(&pk, data->set.str[STRING_KEY], data->set.str[STRING_KEY_PASSWD]); if(ret == 0 && !pk_can_do(&pk, POLARSSL_PK_RSA)) ret = POLARSSL_ERR_PK_TYPE_MISMATCH; if(ret == 0) rsa_copy(&connssl->rsa, pk_rsa(pk)); else rsa_free(&connssl->rsa); pk_free(&pk); if(ret) { #ifdef POLARSSL_ERROR_C error_strerror(ret, errorbuf, sizeof(errorbuf)); #endif /* POLARSSL_ERROR_C */ failf(data, "Error reading private key %s - PolarSSL: (-0x%04X) %s", data->set.str[STRING_KEY], -ret, errorbuf); return CURLE_SSL_CERTPROBLEM; } } /* Load the CRL */ memset(&connssl->crl, 0, sizeof(x509_crl)); if(data->set.str[STRING_SSL_CRLFILE]) { ret = x509_crl_parse_file(&connssl->crl, data->set.str[STRING_SSL_CRLFILE]); if(ret) { #ifdef POLARSSL_ERROR_C error_strerror(ret, errorbuf, sizeof(errorbuf)); #endif /* POLARSSL_ERROR_C */ failf(data, "Error reading CRL file %s - PolarSSL: (-0x%04X) %s", data->set.str[STRING_SSL_CRLFILE], -ret, errorbuf); return CURLE_SSL_CRL_BADFILE; } } infof(data, "PolarSSL: Connecting to %s:%d\n", conn->host.name, conn->remote_port); if(ssl_init(&connssl->ssl)) { failf(data, "PolarSSL: ssl_init failed"); return CURLE_SSL_CONNECT_ERROR; } switch(data->set.ssl.version) { default: case CURL_SSLVERSION_DEFAULT: case CURL_SSLVERSION_TLSv1: ssl_set_min_version(&connssl->ssl, SSL_MAJOR_VERSION_3, SSL_MINOR_VERSION_1); break; case CURL_SSLVERSION_SSLv3: ssl_set_min_version(&connssl->ssl, SSL_MAJOR_VERSION_3, SSL_MINOR_VERSION_0); ssl_set_max_version(&connssl->ssl, SSL_MAJOR_VERSION_3, SSL_MINOR_VERSION_0); infof(data, "PolarSSL: Forced min. SSL Version to be SSLv3\n"); break; case CURL_SSLVERSION_TLSv1_0: ssl_set_min_version(&connssl->ssl, SSL_MAJOR_VERSION_3, SSL_MINOR_VERSION_1); ssl_set_max_version(&connssl->ssl, SSL_MAJOR_VERSION_3, SSL_MINOR_VERSION_1); infof(data, "PolarSSL: Forced min. SSL Version to be TLS 1.0\n"); break; case CURL_SSLVERSION_TLSv1_1: ssl_set_min_version(&connssl->ssl, SSL_MAJOR_VERSION_3, SSL_MINOR_VERSION_2); ssl_set_max_version(&connssl->ssl, SSL_MAJOR_VERSION_3, SSL_MINOR_VERSION_2); infof(data, "PolarSSL: Forced min. SSL Version to be TLS 1.1\n"); break; case CURL_SSLVERSION_TLSv1_2: ssl_set_min_version(&connssl->ssl, SSL_MAJOR_VERSION_3, SSL_MINOR_VERSION_3); ssl_set_max_version(&connssl->ssl, SSL_MAJOR_VERSION_3, SSL_MINOR_VERSION_3); infof(data, "PolarSSL: Forced min. SSL Version to be TLS 1.2\n"); break; } ssl_set_endpoint(&connssl->ssl, SSL_IS_CLIENT); ssl_set_authmode(&connssl->ssl, SSL_VERIFY_OPTIONAL); ssl_set_rng(&connssl->ssl, ctr_drbg_random, &connssl->ctr_drbg); ssl_set_bio(&connssl->ssl, net_recv, &conn->sock[sockindex], net_send, &conn->sock[sockindex]); ssl_set_ciphersuites(&connssl->ssl, ssl_list_ciphersuites()); if(!Curl_ssl_getsessionid(conn, &old_session, &old_session_size)) { memcpy(&connssl->ssn, old_session, old_session_size); infof(data, "PolarSSL re-using session\n"); } ssl_set_session(&connssl->ssl, &connssl->ssn); ssl_set_ca_chain(&connssl->ssl, &connssl->cacert, &connssl->crl, conn->host.name); ssl_set_own_cert_rsa(&connssl->ssl, &connssl->clicert, &connssl->rsa); if(!Curl_inet_pton(AF_INET, conn->host.name, &addr) && #ifdef ENABLE_IPV6 !Curl_inet_pton(AF_INET6, conn->host.name, &addr) && #endif sni && ssl_set_hostname(&connssl->ssl, conn->host.name)) { infof(data, "WARNING: failed to configure " "server name indication (SNI) TLS extension\n"); } #ifdef HAS_ALPN if(data->set.ssl_enable_alpn) { static const char* protocols[3]; int cur = 0; #ifdef USE_NGHTTP2 if(data->set.httpversion == CURL_HTTP_VERSION_2_0) { protocols[cur++] = NGHTTP2_PROTO_VERSION_ID; infof(data, "ALPN, offering %s\n", NGHTTP2_PROTO_VERSION_ID); } #endif protocols[cur++] = ALPN_HTTP_1_1; infof(data, "ALPN, offering %s\n", ALPN_HTTP_1_1); protocols[cur] = NULL; ssl_set_alpn_protocols(&connssl->ssl, protocols); } #endif #ifdef POLARSSL_DEBUG ssl_set_dbg(&connssl->ssl, polarssl_debug, data); #endif connssl->connecting_state = ssl_connect_2; return CURLE_OK; } static CURLcode polarssl_connect_step2(struct connectdata *conn, int sockindex) { int ret; struct SessionHandle *data = conn->data; struct ssl_connect_data* connssl = &conn->ssl[sockindex]; char buffer[1024]; char errorbuf[128]; errorbuf[0] = 0; conn->recv[sockindex] = polarssl_recv; conn->send[sockindex] = polarssl_send; for(;;) { if(!(ret = ssl_handshake(&connssl->ssl))) break; else if(ret != POLARSSL_ERR_NET_WANT_READ && ret != POLARSSL_ERR_NET_WANT_WRITE) { #ifdef POLARSSL_ERROR_C error_strerror(ret, errorbuf, sizeof(errorbuf)); #endif /* POLARSSL_ERROR_C */ failf(data, "ssl_handshake returned - PolarSSL: (-0x%04X) %s", -ret, errorbuf); return CURLE_SSL_CONNECT_ERROR; } else { if(ret == POLARSSL_ERR_NET_WANT_READ) { connssl->connecting_state = ssl_connect_2_reading; return CURLE_OK; } if(ret == POLARSSL_ERR_NET_WANT_WRITE) { connssl->connecting_state = ssl_connect_2_writing; return CURLE_OK; } failf(data, "SSL_connect failed with error %d.", ret); return CURLE_SSL_CONNECT_ERROR; } } infof(data, "PolarSSL: Handshake complete, cipher is %s\n", ssl_get_ciphersuite(&conn->ssl[sockindex].ssl) ); ret = ssl_get_verify_result(&conn->ssl[sockindex].ssl); if(ret && data->set.ssl.verifypeer) { if(ret & BADCERT_EXPIRED) failf(data, "Cert verify failed: BADCERT_EXPIRED"); if(ret & BADCERT_REVOKED) { failf(data, "Cert verify failed: BADCERT_REVOKED"); return CURLE_SSL_CACERT; } if(ret & BADCERT_CN_MISMATCH) failf(data, "Cert verify failed: BADCERT_CN_MISMATCH"); if(ret & BADCERT_NOT_TRUSTED) failf(data, "Cert verify failed: BADCERT_NOT_TRUSTED"); return CURLE_PEER_FAILED_VERIFICATION; } if(ssl_get_peer_cert(&(connssl->ssl))) { /* If the session was resumed, there will be no peer certs */ memset(buffer, 0, sizeof(buffer)); if(x509_crt_info(buffer, sizeof(buffer), (char *)"* ", ssl_get_peer_cert(&(connssl->ssl))) != -1) infof(data, "Dumping cert info:\n%s\n", buffer); } #ifdef HAS_ALPN if(data->set.ssl_enable_alpn) { const char *next_protocol = ssl_get_alpn_protocol(&connssl->ssl); if(next_protocol != NULL) { infof(data, "ALPN, server accepted to use %s\n", next_protocol); #ifdef USE_NGHTTP2 if(!strncmp(next_protocol, NGHTTP2_PROTO_VERSION_ID, NGHTTP2_PROTO_VERSION_ID_LEN)) { conn->negnpn = NPN_HTTP2; } else #endif if(!strncmp(next_protocol, ALPN_HTTP_1_1, ALPN_HTTP_1_1_LENGTH)) { conn->negnpn = NPN_HTTP1_1; } } else infof(data, "ALPN, server did not agree to a protocol\n"); } #endif connssl->connecting_state = ssl_connect_3; infof(data, "SSL connected\n"); return CURLE_OK; } static CURLcode polarssl_connect_step3(struct connectdata *conn, int sockindex) { CURLcode result = CURLE_OK; struct ssl_connect_data *connssl = &conn->ssl[sockindex]; struct SessionHandle *data = conn->data; void *old_ssl_sessionid = NULL; ssl_session *our_ssl_sessionid = &conn->ssl[sockindex].ssn ; bool incache; DEBUGASSERT(ssl_connect_3 == connssl->connecting_state); /* Save the current session data for possible re-use */ incache = !(Curl_ssl_getsessionid(conn, &old_ssl_sessionid, NULL)); if(incache) { if(old_ssl_sessionid != our_ssl_sessionid) { infof(data, "old SSL session ID is stale, removing\n"); Curl_ssl_delsessionid(conn, old_ssl_sessionid); incache = FALSE; } } if(!incache) { void *new_session = malloc(sizeof(ssl_session)); if(new_session) { memcpy(new_session, our_ssl_sessionid, sizeof(ssl_session)); result = Curl_ssl_addsessionid(conn, new_session, sizeof(ssl_session)); } else result = CURLE_OUT_OF_MEMORY; if(result) { failf(data, "failed to store ssl session"); return result; } } connssl->connecting_state = ssl_connect_done; return CURLE_OK; } static ssize_t polarssl_send(struct connectdata *conn, int sockindex, const void *mem, size_t len, CURLcode *curlcode) { int ret = -1; ret = ssl_write(&conn->ssl[sockindex].ssl, (unsigned char *)mem, len); if(ret < 0) { *curlcode = (ret == POLARSSL_ERR_NET_WANT_WRITE) ? CURLE_AGAIN : CURLE_SEND_ERROR; ret = -1; } return ret; } void Curl_polarssl_close(struct connectdata *conn, int sockindex) { rsa_free(&conn->ssl[sockindex].rsa); x509_crt_free(&conn->ssl[sockindex].clicert); x509_crt_free(&conn->ssl[sockindex].cacert); x509_crl_free(&conn->ssl[sockindex].crl); ssl_free(&conn->ssl[sockindex].ssl); } static ssize_t polarssl_recv(struct connectdata *conn, int num, char *buf, size_t buffersize, CURLcode *curlcode) { int ret = -1; ssize_t len = -1; memset(buf, 0, buffersize); ret = ssl_read(&conn->ssl[num].ssl, (unsigned char *)buf, buffersize); if(ret <= 0) { if(ret == POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY) return 0; *curlcode = (ret == POLARSSL_ERR_NET_WANT_READ) ? CURLE_AGAIN : CURLE_RECV_ERROR; return -1; } len = ret; return len; } void Curl_polarssl_session_free(void *ptr) { free(ptr); } size_t Curl_polarssl_version(char *buffer, size_t size) { unsigned int version = version_get_number(); return snprintf(buffer, size, "PolarSSL/%d.%d.%d", version>>24, (version>>16)&0xff, (version>>8)&0xff); } static CURLcode polarssl_connect_common(struct connectdata *conn, int sockindex, bool nonblocking, bool *done) { CURLcode result; struct SessionHandle *data = conn->data; struct ssl_connect_data *connssl = &conn->ssl[sockindex]; curl_socket_t sockfd = conn->sock[sockindex]; long timeout_ms; int what; /* check if the connection has already been established */ if(ssl_connection_complete == connssl->state) { *done = TRUE; return CURLE_OK; } if(ssl_connect_1 == connssl->connecting_state) { /* Find out how much more time we're allowed */ timeout_ms = Curl_timeleft(data, NULL, TRUE); if(timeout_ms < 0) { /* no need to continue if time already is up */ failf(data, "SSL connection timeout"); return CURLE_OPERATION_TIMEDOUT; } result = polarssl_connect_step1(conn, sockindex); if(result) return result; } while(ssl_connect_2 == connssl->connecting_state || ssl_connect_2_reading == connssl->connecting_state || ssl_connect_2_writing == connssl->connecting_state) { /* check allowed time left */ timeout_ms = Curl_timeleft(data, NULL, TRUE); if(timeout_ms < 0) { /* no need to continue if time already is up */ failf(data, "SSL connection timeout"); return CURLE_OPERATION_TIMEDOUT; } /* if ssl is expecting something, check if it's available. */ if(connssl->connecting_state == ssl_connect_2_reading || connssl->connecting_state == ssl_connect_2_writing) { curl_socket_t writefd = ssl_connect_2_writing== connssl->connecting_state?sockfd:CURL_SOCKET_BAD; curl_socket_t readfd = ssl_connect_2_reading== connssl->connecting_state?sockfd:CURL_SOCKET_BAD; what = Curl_socket_ready(readfd, writefd, nonblocking?0:timeout_ms); if(what < 0) { /* fatal error */ failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO); return CURLE_SSL_CONNECT_ERROR; } else if(0 == what) { if(nonblocking) { *done = FALSE; return CURLE_OK; } else { /* timeout */ failf(data, "SSL connection timeout"); return CURLE_OPERATION_TIMEDOUT; } } /* socket is readable or writable */ } /* Run transaction, and return to the caller if it failed or if * this connection is part of a multi handle and this loop would * execute again. This permits the owner of a multi handle to * abort a connection attempt before step2 has completed while * ensuring that a client using select() or epoll() will always * have a valid fdset to wait on. */ result = polarssl_connect_step2(conn, sockindex); if(result || (nonblocking && (ssl_connect_2 == connssl->connecting_state || ssl_connect_2_reading == connssl->connecting_state || ssl_connect_2_writing == connssl->connecting_state))) return result; } /* repeat step2 until all transactions are done. */ if(ssl_connect_3 == connssl->connecting_state) { result = polarssl_connect_step3(conn, sockindex); if(result) return result; } if(ssl_connect_done == connssl->connecting_state) { connssl->state = ssl_connection_complete; conn->recv[sockindex] = polarssl_recv; conn->send[sockindex] = polarssl_send; *done = TRUE; } else *done = FALSE; /* Reset our connect state machine */ connssl->connecting_state = ssl_connect_1; return CURLE_OK; } CURLcode Curl_polarssl_connect_nonblocking(struct connectdata *conn, int sockindex, bool *done) { return polarssl_connect_common(conn, sockindex, TRUE, done); } CURLcode Curl_polarssl_connect(struct connectdata *conn, int sockindex) { CURLcode result; bool done = FALSE; result = polarssl_connect_common(conn, sockindex, FALSE, &done); if(result) return result; DEBUGASSERT(done); return CURLE_OK; } /* * return 0 error initializing SSL * return 1 SSL initialized successfully */ int polarssl_init(void) { return polarsslthreadlock_thread_setup(); } void polarssl_cleanup(void) { (void)polarsslthreadlock_thread_cleanup(); } #endif /* USE_POLARSSL */