| /*************************************************************************** |
| * _ _ ____ _ |
| * Project ___| | | | _ \| | |
| * / __| | | | |_) | | |
| * | (__| |_| | _ <| |___ |
| * \___|\___/|_| \_\_____| |
| * |
| * Copyright (C) 2012 - 2021, Daniel Stenberg, <[email protected]>, et al. |
| * Copyright (C) 2010 - 2011, Hoi-Ho Chan, <[email protected]> |
| * |
| * 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 https://curl.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 mbedTLS-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_MBEDTLS |
| |
| /* Define this to enable lots of debugging for mbedTLS */ |
| /* #define MBEDTLS_DEBUG */ |
| |
| #include <mbedtls/version.h> |
| #if MBEDTLS_VERSION_NUMBER >= 0x02040000 |
| #include <mbedtls/net_sockets.h> |
| #else |
| #include <mbedtls/net.h> |
| #endif |
| #include <mbedtls/ssl.h> |
| #include <mbedtls/certs.h> |
| #include <mbedtls/x509.h> |
| |
| #include <mbedtls/error.h> |
| #include <mbedtls/entropy.h> |
| #include <mbedtls/ctr_drbg.h> |
| #include <mbedtls/sha256.h> |
| |
| #if MBEDTLS_VERSION_MAJOR >= 2 |
| # ifdef MBEDTLS_DEBUG |
| # include <mbedtls/debug.h> |
| # endif |
| #endif |
| |
| #include "urldata.h" |
| #include "sendf.h" |
| #include "inet_pton.h" |
| #include "mbedtls.h" |
| #include "vtls.h" |
| #include "parsedate.h" |
| #include "connect.h" /* for the connect timeout */ |
| #include "select.h" |
| #include "multiif.h" |
| #include "mbedtls_threadlock.h" |
| |
| /* The last 3 #include files should be in this order */ |
| #include "curl_printf.h" |
| #include "curl_memory.h" |
| #include "memdebug.h" |
| |
| struct ssl_backend_data { |
| mbedtls_ctr_drbg_context ctr_drbg; |
| mbedtls_entropy_context entropy; |
| mbedtls_ssl_context ssl; |
| int server_fd; |
| mbedtls_x509_crt cacert; |
| mbedtls_x509_crt clicert; |
| mbedtls_x509_crl crl; |
| mbedtls_pk_context pk; |
| mbedtls_ssl_config config; |
| const char *protocols[3]; |
| }; |
| |
| /* apply threading? */ |
| #if defined(USE_THREADS_POSIX) || defined(USE_THREADS_WIN32) |
| #define THREADING_SUPPORT |
| #endif |
| |
| #ifndef MBEDTLS_ERROR_C |
| #define mbedtls_strerror(a,b,c) b[0] = 0 |
| #endif |
| |
| #if defined(THREADING_SUPPORT) |
| static mbedtls_entropy_context ts_entropy; |
| |
| static int entropy_init_initialized = 0; |
| |
| /* start of entropy_init_mutex() */ |
| static void entropy_init_mutex(mbedtls_entropy_context *ctx) |
| { |
| /* lock 0 = entropy_init_mutex() */ |
| Curl_mbedtlsthreadlock_lock_function(0); |
| if(entropy_init_initialized == 0) { |
| mbedtls_entropy_init(ctx); |
| entropy_init_initialized = 1; |
| } |
| Curl_mbedtlsthreadlock_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() */ |
| Curl_mbedtlsthreadlock_lock_function(1); |
| ret = mbedtls_entropy_func(data, output, len); |
| Curl_mbedtlsthreadlock_unlock_function(1); |
| |
| return ret; |
| } |
| /* end of entropy_func_mutex() */ |
| |
| #endif /* THREADING_SUPPORT */ |
| |
| #ifdef MBEDTLS_DEBUG |
| static void mbed_debug(void *context, int level, const char *f_name, |
| int line_nb, const char *line) |
| { |
| struct Curl_easy *data = NULL; |
| |
| if(!context) |
| return; |
| |
| data = (struct Curl_easy *)context; |
| |
| infof(data, "%s", line); |
| (void) level; |
| } |
| #else |
| #endif |
| |
| /* ALPN for http2? */ |
| #ifdef USE_NGHTTP2 |
| # undef HAS_ALPN |
| # ifdef MBEDTLS_SSL_ALPN |
| # define HAS_ALPN |
| # endif |
| #endif |
| |
| |
| /* |
| * profile |
| */ |
| static const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_fr = |
| { |
| /* Hashes from SHA-1 and above */ |
| MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA1) | |
| MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_RIPEMD160) | |
| MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA224) | |
| MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA256) | |
| MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA384) | |
| MBEDTLS_X509_ID_FLAG(MBEDTLS_MD_SHA512), |
| 0xFFFFFFF, /* Any PK alg */ |
| 0xFFFFFFF, /* Any curve */ |
| 1024, /* RSA min key len */ |
| }; |
| |
| /* See https://tls.mbed.org/discussions/generic/ |
| howto-determine-exact-buffer-len-for-mbedtls_pk_write_pubkey_der |
| */ |
| #define RSA_PUB_DER_MAX_BYTES (38 + 2 * MBEDTLS_MPI_MAX_SIZE) |
| #define ECP_PUB_DER_MAX_BYTES (30 + 2 * MBEDTLS_ECP_MAX_BYTES) |
| |
| #define PUB_DER_MAX_BYTES (RSA_PUB_DER_MAX_BYTES > ECP_PUB_DER_MAX_BYTES ? \ |
| RSA_PUB_DER_MAX_BYTES : ECP_PUB_DER_MAX_BYTES) |
| |
| static Curl_recv mbed_recv; |
| static Curl_send mbed_send; |
| |
| static CURLcode mbedtls_version_from_curl(int *mbedver, long version) |
| { |
| switch(version) { |
| case CURL_SSLVERSION_TLSv1_0: |
| *mbedver = MBEDTLS_SSL_MINOR_VERSION_1; |
| return CURLE_OK; |
| case CURL_SSLVERSION_TLSv1_1: |
| *mbedver = MBEDTLS_SSL_MINOR_VERSION_2; |
| return CURLE_OK; |
| case CURL_SSLVERSION_TLSv1_2: |
| *mbedver = MBEDTLS_SSL_MINOR_VERSION_3; |
| return CURLE_OK; |
| case CURL_SSLVERSION_TLSv1_3: |
| break; |
| } |
| return CURLE_SSL_CONNECT_ERROR; |
| } |
| |
| static CURLcode |
| set_ssl_version_min_max(struct Curl_easy *data, struct connectdata *conn, |
| int sockindex) |
| { |
| struct ssl_connect_data *connssl = &conn->ssl[sockindex]; |
| struct ssl_backend_data *backend = connssl->backend; |
| int mbedtls_ver_min = MBEDTLS_SSL_MINOR_VERSION_1; |
| int mbedtls_ver_max = MBEDTLS_SSL_MINOR_VERSION_1; |
| long ssl_version = SSL_CONN_CONFIG(version); |
| long ssl_version_max = SSL_CONN_CONFIG(version_max); |
| CURLcode result = CURLE_OK; |
| |
| switch(ssl_version) { |
| case CURL_SSLVERSION_DEFAULT: |
| case CURL_SSLVERSION_TLSv1: |
| ssl_version = CURL_SSLVERSION_TLSv1_0; |
| break; |
| } |
| |
| switch(ssl_version_max) { |
| case CURL_SSLVERSION_MAX_NONE: |
| case CURL_SSLVERSION_MAX_DEFAULT: |
| ssl_version_max = CURL_SSLVERSION_MAX_TLSv1_2; |
| break; |
| } |
| |
| result = mbedtls_version_from_curl(&mbedtls_ver_min, ssl_version); |
| if(result) { |
| failf(data, "unsupported min version passed via CURLOPT_SSLVERSION"); |
| return result; |
| } |
| result = mbedtls_version_from_curl(&mbedtls_ver_max, ssl_version_max >> 16); |
| if(result) { |
| failf(data, "unsupported max version passed via CURLOPT_SSLVERSION"); |
| return result; |
| } |
| |
| mbedtls_ssl_conf_min_version(&backend->config, MBEDTLS_SSL_MAJOR_VERSION_3, |
| mbedtls_ver_min); |
| mbedtls_ssl_conf_max_version(&backend->config, MBEDTLS_SSL_MAJOR_VERSION_3, |
| mbedtls_ver_max); |
| |
| return result; |
| } |
| |
| static CURLcode |
| mbed_connect_step1(struct Curl_easy *data, struct connectdata *conn, |
| int sockindex) |
| { |
| struct ssl_connect_data *connssl = &conn->ssl[sockindex]; |
| struct ssl_backend_data *backend = connssl->backend; |
| const char * const ssl_cafile = SSL_CONN_CONFIG(CAfile); |
| const bool verifypeer = SSL_CONN_CONFIG(verifypeer); |
| const char * const ssl_capath = SSL_CONN_CONFIG(CApath); |
| char * const ssl_cert = SSL_SET_OPTION(primary.clientcert); |
| const struct curl_blob *ssl_cert_blob = SSL_SET_OPTION(primary.cert_blob); |
| const char * const ssl_crlfile = SSL_SET_OPTION(CRLfile); |
| const char * const hostname = SSL_HOST_NAME(); |
| const long int port = SSL_HOST_PORT(); |
| int ret = -1; |
| char errorbuf[128]; |
| |
| if((SSL_CONN_CONFIG(version) == CURL_SSLVERSION_SSLv2) || |
| (SSL_CONN_CONFIG(version) == CURL_SSLVERSION_SSLv3)) { |
| failf(data, "Not supported SSL version"); |
| return CURLE_NOT_BUILT_IN; |
| } |
| |
| #ifdef THREADING_SUPPORT |
| entropy_init_mutex(&ts_entropy); |
| mbedtls_ctr_drbg_init(&backend->ctr_drbg); |
| |
| ret = mbedtls_ctr_drbg_seed(&backend->ctr_drbg, entropy_func_mutex, |
| &ts_entropy, NULL, 0); |
| if(ret) { |
| mbedtls_strerror(ret, errorbuf, sizeof(errorbuf)); |
| failf(data, "Failed - mbedTLS: ctr_drbg_init returned (-0x%04X) %s", |
| -ret, errorbuf); |
| } |
| #else |
| mbedtls_entropy_init(&backend->entropy); |
| mbedtls_ctr_drbg_init(&backend->ctr_drbg); |
| |
| ret = mbedtls_ctr_drbg_seed(&backend->ctr_drbg, mbedtls_entropy_func, |
| &backend->entropy, NULL, 0); |
| if(ret) { |
| mbedtls_strerror(ret, errorbuf, sizeof(errorbuf)); |
| failf(data, "Failed - mbedTLS: ctr_drbg_init returned (-0x%04X) %s", |
| -ret, errorbuf); |
| } |
| #endif /* THREADING_SUPPORT */ |
| |
| /* Load the trusted CA */ |
| mbedtls_x509_crt_init(&backend->cacert); |
| |
| if(ssl_cafile) { |
| ret = mbedtls_x509_crt_parse_file(&backend->cacert, ssl_cafile); |
| |
| if(ret<0) { |
| mbedtls_strerror(ret, errorbuf, sizeof(errorbuf)); |
| failf(data, "Error reading ca cert file %s - mbedTLS: (-0x%04X) %s", |
| ssl_cafile, -ret, errorbuf); |
| |
| if(verifypeer) |
| return CURLE_SSL_CACERT_BADFILE; |
| } |
| } |
| |
| if(ssl_capath) { |
| ret = mbedtls_x509_crt_parse_path(&backend->cacert, ssl_capath); |
| |
| if(ret<0) { |
| mbedtls_strerror(ret, errorbuf, sizeof(errorbuf)); |
| failf(data, "Error reading ca cert path %s - mbedTLS: (-0x%04X) %s", |
| ssl_capath, -ret, errorbuf); |
| |
| if(verifypeer) |
| return CURLE_SSL_CACERT_BADFILE; |
| } |
| } |
| |
| /* Load the client certificate */ |
| mbedtls_x509_crt_init(&backend->clicert); |
| |
| if(ssl_cert) { |
| ret = mbedtls_x509_crt_parse_file(&backend->clicert, ssl_cert); |
| |
| if(ret) { |
| mbedtls_strerror(ret, errorbuf, sizeof(errorbuf)); |
| failf(data, "Error reading client cert file %s - mbedTLS: (-0x%04X) %s", |
| ssl_cert, -ret, errorbuf); |
| |
| return CURLE_SSL_CERTPROBLEM; |
| } |
| } |
| |
| if(ssl_cert_blob) { |
| const unsigned char *blob_data = |
| (const unsigned char *)ssl_cert_blob->data; |
| ret = mbedtls_x509_crt_parse(&backend->clicert, blob_data, |
| ssl_cert_blob->len); |
| |
| if(ret) { |
| mbedtls_strerror(ret, errorbuf, sizeof(errorbuf)); |
| failf(data, "Error reading private key %s - mbedTLS: (-0x%04X) %s", |
| SSL_SET_OPTION(key), -ret, errorbuf); |
| return CURLE_SSL_CERTPROBLEM; |
| } |
| } |
| |
| /* Load the client private key */ |
| mbedtls_pk_init(&backend->pk); |
| |
| if(SSL_SET_OPTION(key) || SSL_SET_OPTION(key_blob)) { |
| if(SSL_SET_OPTION(key)) { |
| ret = mbedtls_pk_parse_keyfile(&backend->pk, SSL_SET_OPTION(key), |
| SSL_SET_OPTION(key_passwd)); |
| |
| if(ret) { |
| mbedtls_strerror(ret, errorbuf, sizeof(errorbuf)); |
| failf(data, "Error reading private key %s - mbedTLS: (-0x%04X) %s", |
| SSL_SET_OPTION(key), -ret, errorbuf); |
| return CURLE_SSL_CERTPROBLEM; |
| } |
| } |
| else { |
| const struct curl_blob *ssl_key_blob = SSL_SET_OPTION(key_blob); |
| const unsigned char *key_data = |
| (const unsigned char *)ssl_key_blob->data; |
| const char *passwd = SSL_SET_OPTION(key_passwd); |
| ret = mbedtls_pk_parse_key(&backend->pk, key_data, ssl_key_blob->len, |
| (const unsigned char *)passwd, |
| passwd ? strlen(passwd) : 0); |
| |
| if(ret) { |
| mbedtls_strerror(ret, errorbuf, sizeof(errorbuf)); |
| failf(data, "Error parsing private key - mbedTLS: (-0x%04X) %s", |
| -ret, errorbuf); |
| return CURLE_SSL_CERTPROBLEM; |
| } |
| } |
| |
| if(ret == 0 && !(mbedtls_pk_can_do(&backend->pk, MBEDTLS_PK_RSA) || |
| mbedtls_pk_can_do(&backend->pk, MBEDTLS_PK_ECKEY))) |
| ret = MBEDTLS_ERR_PK_TYPE_MISMATCH; |
| } |
| |
| /* Load the CRL */ |
| mbedtls_x509_crl_init(&backend->crl); |
| |
| if(ssl_crlfile) { |
| ret = mbedtls_x509_crl_parse_file(&backend->crl, ssl_crlfile); |
| |
| if(ret) { |
| mbedtls_strerror(ret, errorbuf, sizeof(errorbuf)); |
| failf(data, "Error reading CRL file %s - mbedTLS: (-0x%04X) %s", |
| ssl_crlfile, -ret, errorbuf); |
| |
| return CURLE_SSL_CRL_BADFILE; |
| } |
| } |
| |
| infof(data, "mbedTLS: Connecting to %s:%ld", hostname, port); |
| |
| mbedtls_ssl_config_init(&backend->config); |
| |
| mbedtls_ssl_init(&backend->ssl); |
| if(mbedtls_ssl_setup(&backend->ssl, &backend->config)) { |
| failf(data, "mbedTLS: ssl_init failed"); |
| return CURLE_SSL_CONNECT_ERROR; |
| } |
| ret = mbedtls_ssl_config_defaults(&backend->config, |
| MBEDTLS_SSL_IS_CLIENT, |
| MBEDTLS_SSL_TRANSPORT_STREAM, |
| MBEDTLS_SSL_PRESET_DEFAULT); |
| if(ret) { |
| failf(data, "mbedTLS: ssl_config failed"); |
| return CURLE_SSL_CONNECT_ERROR; |
| } |
| |
| /* new profile with RSA min key len = 1024 ... */ |
| mbedtls_ssl_conf_cert_profile(&backend->config, |
| &mbedtls_x509_crt_profile_fr); |
| |
| switch(SSL_CONN_CONFIG(version)) { |
| case CURL_SSLVERSION_DEFAULT: |
| case CURL_SSLVERSION_TLSv1: |
| mbedtls_ssl_conf_min_version(&backend->config, MBEDTLS_SSL_MAJOR_VERSION_3, |
| MBEDTLS_SSL_MINOR_VERSION_1); |
| infof(data, "mbedTLS: Set min SSL version to TLS 1.0"); |
| break; |
| case CURL_SSLVERSION_TLSv1_0: |
| case CURL_SSLVERSION_TLSv1_1: |
| case CURL_SSLVERSION_TLSv1_2: |
| case CURL_SSLVERSION_TLSv1_3: |
| { |
| CURLcode result = set_ssl_version_min_max(data, conn, sockindex); |
| if(result != CURLE_OK) |
| return result; |
| break; |
| } |
| default: |
| failf(data, "Unrecognized parameter passed via CURLOPT_SSLVERSION"); |
| return CURLE_SSL_CONNECT_ERROR; |
| } |
| |
| mbedtls_ssl_conf_authmode(&backend->config, MBEDTLS_SSL_VERIFY_OPTIONAL); |
| |
| mbedtls_ssl_conf_rng(&backend->config, mbedtls_ctr_drbg_random, |
| &backend->ctr_drbg); |
| mbedtls_ssl_set_bio(&backend->ssl, &conn->sock[sockindex], |
| mbedtls_net_send, |
| mbedtls_net_recv, |
| NULL /* rev_timeout() */); |
| |
| mbedtls_ssl_conf_ciphersuites(&backend->config, |
| mbedtls_ssl_list_ciphersuites()); |
| |
| #if defined(MBEDTLS_SSL_RENEGOTIATION) |
| mbedtls_ssl_conf_renegotiation(&backend->config, |
| MBEDTLS_SSL_RENEGOTIATION_ENABLED); |
| #endif |
| |
| #if defined(MBEDTLS_SSL_SESSION_TICKETS) |
| mbedtls_ssl_conf_session_tickets(&backend->config, |
| MBEDTLS_SSL_SESSION_TICKETS_DISABLED); |
| #endif |
| |
| /* Check if there's a cached ID we can/should use here! */ |
| if(SSL_SET_OPTION(primary.sessionid)) { |
| void *old_session = NULL; |
| |
| Curl_ssl_sessionid_lock(data); |
| if(!Curl_ssl_getsessionid(data, conn, |
| SSL_IS_PROXY() ? TRUE : FALSE, |
| &old_session, NULL, sockindex)) { |
| ret = mbedtls_ssl_set_session(&backend->ssl, old_session); |
| if(ret) { |
| Curl_ssl_sessionid_unlock(data); |
| failf(data, "mbedtls_ssl_set_session returned -0x%x", -ret); |
| return CURLE_SSL_CONNECT_ERROR; |
| } |
| infof(data, "mbedTLS re-using session"); |
| } |
| Curl_ssl_sessionid_unlock(data); |
| } |
| |
| mbedtls_ssl_conf_ca_chain(&backend->config, |
| &backend->cacert, |
| &backend->crl); |
| |
| if(SSL_SET_OPTION(key) || SSL_SET_OPTION(key_blob)) { |
| mbedtls_ssl_conf_own_cert(&backend->config, |
| &backend->clicert, &backend->pk); |
| } |
| if(mbedtls_ssl_set_hostname(&backend->ssl, hostname)) { |
| /* mbedtls_ssl_set_hostname() sets the name to use in CN/SAN checks *and* |
| the name to set in the SNI extension. So even if curl connects to a |
| host specified as an IP address, this function must be used. */ |
| failf(data, "couldn't set hostname in mbedTLS"); |
| return CURLE_SSL_CONNECT_ERROR; |
| } |
| |
| #ifdef HAS_ALPN |
| if(conn->bits.tls_enable_alpn) { |
| const char **p = &backend->protocols[0]; |
| #ifdef USE_NGHTTP2 |
| if(data->state.httpwant >= CURL_HTTP_VERSION_2) |
| *p++ = NGHTTP2_PROTO_VERSION_ID; |
| #endif |
| *p++ = ALPN_HTTP_1_1; |
| *p = NULL; |
| /* this function doesn't clone the protocols array, which is why we need |
| to keep it around */ |
| if(mbedtls_ssl_conf_alpn_protocols(&backend->config, |
| &backend->protocols[0])) { |
| failf(data, "Failed setting ALPN protocols"); |
| return CURLE_SSL_CONNECT_ERROR; |
| } |
| for(p = &backend->protocols[0]; *p; ++p) |
| infof(data, "ALPN, offering %s", *p); |
| } |
| #endif |
| |
| #ifdef MBEDTLS_DEBUG |
| /* In order to make that work in mbedtls MBEDTLS_DEBUG_C must be defined. */ |
| mbedtls_ssl_conf_dbg(&backend->config, mbed_debug, data); |
| /* - 0 No debug |
| * - 1 Error |
| * - 2 State change |
| * - 3 Informational |
| * - 4 Verbose |
| */ |
| mbedtls_debug_set_threshold(4); |
| #endif |
| |
| /* give application a chance to interfere with mbedTLS set up. */ |
| if(data->set.ssl.fsslctx) { |
| ret = (*data->set.ssl.fsslctx)(data, &backend->config, |
| data->set.ssl.fsslctxp); |
| if(ret) { |
| failf(data, "error signaled by ssl ctx callback"); |
| return ret; |
| } |
| } |
| |
| connssl->connecting_state = ssl_connect_2; |
| |
| return CURLE_OK; |
| } |
| |
| static CURLcode |
| mbed_connect_step2(struct Curl_easy *data, struct connectdata *conn, |
| int sockindex) |
| { |
| int ret; |
| struct ssl_connect_data *connssl = &conn->ssl[sockindex]; |
| struct ssl_backend_data *backend = connssl->backend; |
| const mbedtls_x509_crt *peercert; |
| const char * const pinnedpubkey = SSL_PINNED_PUB_KEY(); |
| |
| conn->recv[sockindex] = mbed_recv; |
| conn->send[sockindex] = mbed_send; |
| |
| ret = mbedtls_ssl_handshake(&backend->ssl); |
| |
| if(ret == MBEDTLS_ERR_SSL_WANT_READ) { |
| connssl->connecting_state = ssl_connect_2_reading; |
| return CURLE_OK; |
| } |
| else if(ret == MBEDTLS_ERR_SSL_WANT_WRITE) { |
| connssl->connecting_state = ssl_connect_2_writing; |
| return CURLE_OK; |
| } |
| else if(ret) { |
| char errorbuf[128]; |
| mbedtls_strerror(ret, errorbuf, sizeof(errorbuf)); |
| failf(data, "ssl_handshake returned - mbedTLS: (-0x%04X) %s", |
| -ret, errorbuf); |
| return CURLE_SSL_CONNECT_ERROR; |
| } |
| |
| infof(data, "mbedTLS: Handshake complete, cipher is %s", |
| mbedtls_ssl_get_ciphersuite(&backend->ssl)); |
| |
| ret = mbedtls_ssl_get_verify_result(&backend->ssl); |
| |
| if(!SSL_CONN_CONFIG(verifyhost)) |
| /* Ignore hostname errors if verifyhost is disabled */ |
| ret &= ~MBEDTLS_X509_BADCERT_CN_MISMATCH; |
| |
| if(ret && SSL_CONN_CONFIG(verifypeer)) { |
| if(ret & MBEDTLS_X509_BADCERT_EXPIRED) |
| failf(data, "Cert verify failed: BADCERT_EXPIRED"); |
| |
| else if(ret & MBEDTLS_X509_BADCERT_REVOKED) |
| failf(data, "Cert verify failed: BADCERT_REVOKED"); |
| |
| else if(ret & MBEDTLS_X509_BADCERT_CN_MISMATCH) |
| failf(data, "Cert verify failed: BADCERT_CN_MISMATCH"); |
| |
| else if(ret & MBEDTLS_X509_BADCERT_NOT_TRUSTED) |
| failf(data, "Cert verify failed: BADCERT_NOT_TRUSTED"); |
| |
| else if(ret & MBEDTLS_X509_BADCERT_FUTURE) |
| failf(data, "Cert verify failed: BADCERT_FUTURE"); |
| |
| return CURLE_PEER_FAILED_VERIFICATION; |
| } |
| |
| peercert = mbedtls_ssl_get_peer_cert(&backend->ssl); |
| |
| if(peercert && data->set.verbose) { |
| const size_t bufsize = 16384; |
| char *buffer = malloc(bufsize); |
| |
| if(!buffer) |
| return CURLE_OUT_OF_MEMORY; |
| |
| if(mbedtls_x509_crt_info(buffer, bufsize, "* ", peercert) > 0) |
| infof(data, "Dumping cert info: %s", buffer); |
| else |
| infof(data, "Unable to dump certificate information"); |
| |
| free(buffer); |
| } |
| |
| if(pinnedpubkey) { |
| int size; |
| CURLcode result; |
| mbedtls_x509_crt *p; |
| unsigned char pubkey[PUB_DER_MAX_BYTES]; |
| |
| if(!peercert || !peercert->raw.p || !peercert->raw.len) { |
| failf(data, "Failed due to missing peer certificate"); |
| return CURLE_SSL_PINNEDPUBKEYNOTMATCH; |
| } |
| |
| p = calloc(1, sizeof(*p)); |
| |
| if(!p) |
| return CURLE_OUT_OF_MEMORY; |
| |
| mbedtls_x509_crt_init(p); |
| |
| /* Make a copy of our const peercert because mbedtls_pk_write_pubkey_der |
| needs a non-const key, for now. |
| https://github.com/ARMmbed/mbedtls/issues/396 */ |
| if(mbedtls_x509_crt_parse_der(p, peercert->raw.p, peercert->raw.len)) { |
| failf(data, "Failed copying peer certificate"); |
| mbedtls_x509_crt_free(p); |
| free(p); |
| return CURLE_SSL_PINNEDPUBKEYNOTMATCH; |
| } |
| |
| size = mbedtls_pk_write_pubkey_der(&p->pk, pubkey, PUB_DER_MAX_BYTES); |
| |
| if(size <= 0) { |
| failf(data, "Failed copying public key from peer certificate"); |
| mbedtls_x509_crt_free(p); |
| free(p); |
| return CURLE_SSL_PINNEDPUBKEYNOTMATCH; |
| } |
| |
| /* mbedtls_pk_write_pubkey_der writes data at the end of the buffer. */ |
| result = Curl_pin_peer_pubkey(data, |
| pinnedpubkey, |
| &pubkey[PUB_DER_MAX_BYTES - size], size); |
| if(result) { |
| mbedtls_x509_crt_free(p); |
| free(p); |
| return result; |
| } |
| |
| mbedtls_x509_crt_free(p); |
| free(p); |
| } |
| |
| #ifdef HAS_ALPN |
| if(conn->bits.tls_enable_alpn) { |
| const char *next_protocol = mbedtls_ssl_get_alpn_protocol(&backend->ssl); |
| |
| if(next_protocol) { |
| infof(data, "ALPN, server accepted to use %s", next_protocol); |
| #ifdef USE_NGHTTP2 |
| if(!strncmp(next_protocol, NGHTTP2_PROTO_VERSION_ID, |
| NGHTTP2_PROTO_VERSION_ID_LEN) && |
| !next_protocol[NGHTTP2_PROTO_VERSION_ID_LEN]) { |
| conn->negnpn = CURL_HTTP_VERSION_2; |
| } |
| else |
| #endif |
| if(!strncmp(next_protocol, ALPN_HTTP_1_1, ALPN_HTTP_1_1_LENGTH) && |
| !next_protocol[ALPN_HTTP_1_1_LENGTH]) { |
| conn->negnpn = CURL_HTTP_VERSION_1_1; |
| } |
| } |
| else { |
| infof(data, "ALPN, server did not agree to a protocol"); |
| } |
| Curl_multiuse_state(data, conn->negnpn == CURL_HTTP_VERSION_2 ? |
| BUNDLE_MULTIPLEX : BUNDLE_NO_MULTIUSE); |
| } |
| #endif |
| |
| connssl->connecting_state = ssl_connect_3; |
| infof(data, "SSL connected"); |
| |
| return CURLE_OK; |
| } |
| |
| static CURLcode |
| mbed_connect_step3(struct Curl_easy *data, struct connectdata *conn, |
| int sockindex) |
| { |
| CURLcode retcode = CURLE_OK; |
| struct ssl_connect_data *connssl = &conn->ssl[sockindex]; |
| struct ssl_backend_data *backend = connssl->backend; |
| |
| DEBUGASSERT(ssl_connect_3 == connssl->connecting_state); |
| |
| if(SSL_SET_OPTION(primary.sessionid)) { |
| int ret; |
| mbedtls_ssl_session *our_ssl_sessionid; |
| void *old_ssl_sessionid = NULL; |
| bool isproxy = SSL_IS_PROXY() ? TRUE : FALSE; |
| |
| our_ssl_sessionid = malloc(sizeof(mbedtls_ssl_session)); |
| if(!our_ssl_sessionid) |
| return CURLE_OUT_OF_MEMORY; |
| |
| mbedtls_ssl_session_init(our_ssl_sessionid); |
| |
| ret = mbedtls_ssl_get_session(&backend->ssl, our_ssl_sessionid); |
| if(ret) { |
| if(ret != MBEDTLS_ERR_SSL_ALLOC_FAILED) |
| mbedtls_ssl_session_free(our_ssl_sessionid); |
| free(our_ssl_sessionid); |
| failf(data, "mbedtls_ssl_get_session returned -0x%x", -ret); |
| return CURLE_SSL_CONNECT_ERROR; |
| } |
| |
| /* If there's already a matching session in the cache, delete it */ |
| Curl_ssl_sessionid_lock(data); |
| if(!Curl_ssl_getsessionid(data, conn, isproxy, &old_ssl_sessionid, NULL, |
| sockindex)) |
| Curl_ssl_delsessionid(data, old_ssl_sessionid); |
| |
| retcode = Curl_ssl_addsessionid(data, conn, isproxy, our_ssl_sessionid, |
| 0, sockindex); |
| Curl_ssl_sessionid_unlock(data); |
| if(retcode) { |
| mbedtls_ssl_session_free(our_ssl_sessionid); |
| free(our_ssl_sessionid); |
| failf(data, "failed to store ssl session"); |
| return retcode; |
| } |
| } |
| |
| connssl->connecting_state = ssl_connect_done; |
| |
| return CURLE_OK; |
| } |
| |
| static ssize_t mbed_send(struct Curl_easy *data, int sockindex, |
| const void *mem, size_t len, |
| CURLcode *curlcode) |
| { |
| struct connectdata *conn = data->conn; |
| struct ssl_connect_data *connssl = &conn->ssl[sockindex]; |
| struct ssl_backend_data *backend = connssl->backend; |
| int ret = -1; |
| |
| ret = mbedtls_ssl_write(&backend->ssl, (unsigned char *)mem, len); |
| |
| if(ret < 0) { |
| *curlcode = (ret == MBEDTLS_ERR_SSL_WANT_WRITE) ? |
| CURLE_AGAIN : CURLE_SEND_ERROR; |
| ret = -1; |
| } |
| |
| return ret; |
| } |
| |
| static void mbedtls_close_all(struct Curl_easy *data) |
| { |
| (void)data; |
| } |
| |
| static void mbedtls_close(struct Curl_easy *data, |
| struct connectdata *conn, int sockindex) |
| { |
| struct ssl_connect_data *connssl = &conn->ssl[sockindex]; |
| struct ssl_backend_data *backend = connssl->backend; |
| char buf[32]; |
| (void) data; |
| |
| /* Maybe the server has already sent a close notify alert. |
| Read it to avoid an RST on the TCP connection. */ |
| (void)mbedtls_ssl_read(&backend->ssl, (unsigned char *)buf, sizeof(buf)); |
| |
| mbedtls_pk_free(&backend->pk); |
| mbedtls_x509_crt_free(&backend->clicert); |
| mbedtls_x509_crt_free(&backend->cacert); |
| mbedtls_x509_crl_free(&backend->crl); |
| mbedtls_ssl_config_free(&backend->config); |
| mbedtls_ssl_free(&backend->ssl); |
| mbedtls_ctr_drbg_free(&backend->ctr_drbg); |
| #ifndef THREADING_SUPPORT |
| mbedtls_entropy_free(&backend->entropy); |
| #endif /* THREADING_SUPPORT */ |
| } |
| |
| static ssize_t mbed_recv(struct Curl_easy *data, int num, |
| char *buf, size_t buffersize, |
| CURLcode *curlcode) |
| { |
| struct connectdata *conn = data->conn; |
| struct ssl_connect_data *connssl = &conn->ssl[num]; |
| struct ssl_backend_data *backend = connssl->backend; |
| int ret = -1; |
| ssize_t len = -1; |
| |
| ret = mbedtls_ssl_read(&backend->ssl, (unsigned char *)buf, |
| buffersize); |
| |
| if(ret <= 0) { |
| if(ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) |
| return 0; |
| |
| *curlcode = (ret == MBEDTLS_ERR_SSL_WANT_READ) ? |
| CURLE_AGAIN : CURLE_RECV_ERROR; |
| return -1; |
| } |
| |
| len = ret; |
| |
| return len; |
| } |
| |
| static void mbedtls_session_free(void *ptr) |
| { |
| mbedtls_ssl_session_free(ptr); |
| free(ptr); |
| } |
| |
| static size_t mbedtls_version(char *buffer, size_t size) |
| { |
| #ifdef MBEDTLS_VERSION_C |
| /* if mbedtls_version_get_number() is available it is better */ |
| unsigned int version = mbedtls_version_get_number(); |
| return msnprintf(buffer, size, "mbedTLS/%u.%u.%u", version>>24, |
| (version>>16)&0xff, (version>>8)&0xff); |
| #else |
| return msnprintf(buffer, size, "mbedTLS/%s", MBEDTLS_VERSION_STRING); |
| #endif |
| } |
| |
| static CURLcode mbedtls_random(struct Curl_easy *data, |
| unsigned char *entropy, size_t length) |
| { |
| #if defined(MBEDTLS_CTR_DRBG_C) |
| int ret = -1; |
| char errorbuf[128]; |
| mbedtls_entropy_context ctr_entropy; |
| mbedtls_ctr_drbg_context ctr_drbg; |
| mbedtls_entropy_init(&ctr_entropy); |
| mbedtls_ctr_drbg_init(&ctr_drbg); |
| |
| ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, |
| &ctr_entropy, NULL, 0); |
| |
| if(ret) { |
| mbedtls_strerror(ret, errorbuf, sizeof(errorbuf)); |
| failf(data, "Failed - mbedTLS: ctr_drbg_seed returned (-0x%04X) %s", |
| -ret, errorbuf); |
| } |
| else { |
| ret = mbedtls_ctr_drbg_random(&ctr_drbg, entropy, length); |
| |
| if(ret) { |
| mbedtls_strerror(ret, errorbuf, sizeof(errorbuf)); |
| failf(data, "mbedTLS: ctr_drbg_init returned (-0x%04X) %s", |
| -ret, errorbuf); |
| } |
| } |
| |
| mbedtls_ctr_drbg_free(&ctr_drbg); |
| mbedtls_entropy_free(&ctr_entropy); |
| |
| return ret == 0 ? CURLE_OK : CURLE_FAILED_INIT; |
| #elif defined(MBEDTLS_HAVEGE_C) |
| mbedtls_havege_state hs; |
| mbedtls_havege_init(&hs); |
| mbedtls_havege_random(&hs, entropy, length); |
| mbedtls_havege_free(&hs); |
| return CURLE_OK; |
| #else |
| return CURLE_NOT_BUILT_IN; |
| #endif |
| } |
| |
| static CURLcode |
| mbed_connect_common(struct Curl_easy *data, |
| struct connectdata *conn, |
| int sockindex, |
| bool nonblocking, |
| bool *done) |
| { |
| CURLcode retcode; |
| struct ssl_connect_data *connssl = &conn->ssl[sockindex]; |
| curl_socket_t sockfd = conn->sock[sockindex]; |
| timediff_t 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; |
| } |
| retcode = mbed_connect_step1(data, conn, sockindex); |
| if(retcode) |
| return retcode; |
| } |
| |
| 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_check(readfd, CURL_SOCKET_BAD, 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. |
| */ |
| retcode = mbed_connect_step2(data, conn, sockindex); |
| if(retcode || (nonblocking && |
| (ssl_connect_2 == connssl->connecting_state || |
| ssl_connect_2_reading == connssl->connecting_state || |
| ssl_connect_2_writing == connssl->connecting_state))) |
| return retcode; |
| |
| } /* repeat step2 until all transactions are done. */ |
| |
| if(ssl_connect_3 == connssl->connecting_state) { |
| retcode = mbed_connect_step3(data, conn, sockindex); |
| if(retcode) |
| return retcode; |
| } |
| |
| if(ssl_connect_done == connssl->connecting_state) { |
| connssl->state = ssl_connection_complete; |
| conn->recv[sockindex] = mbed_recv; |
| conn->send[sockindex] = mbed_send; |
| *done = TRUE; |
| } |
| else |
| *done = FALSE; |
| |
| /* Reset our connect state machine */ |
| connssl->connecting_state = ssl_connect_1; |
| |
| return CURLE_OK; |
| } |
| |
| static CURLcode mbedtls_connect_nonblocking(struct Curl_easy *data, |
| struct connectdata *conn, |
| int sockindex, bool *done) |
| { |
| return mbed_connect_common(data, conn, sockindex, TRUE, done); |
| } |
| |
| |
| static CURLcode mbedtls_connect(struct Curl_easy *data, |
| struct connectdata *conn, int sockindex) |
| { |
| CURLcode retcode; |
| bool done = FALSE; |
| |
| retcode = mbed_connect_common(data, conn, sockindex, FALSE, &done); |
| if(retcode) |
| return retcode; |
| |
| DEBUGASSERT(done); |
| |
| return CURLE_OK; |
| } |
| |
| /* |
| * return 0 error initializing SSL |
| * return 1 SSL initialized successfully |
| */ |
| static int mbedtls_init(void) |
| { |
| return Curl_mbedtlsthreadlock_thread_setup(); |
| } |
| |
| static void mbedtls_cleanup(void) |
| { |
| (void)Curl_mbedtlsthreadlock_thread_cleanup(); |
| } |
| |
| static bool mbedtls_data_pending(const struct connectdata *conn, |
| int sockindex) |
| { |
| const struct ssl_connect_data *connssl = &conn->ssl[sockindex]; |
| struct ssl_backend_data *backend = connssl->backend; |
| return mbedtls_ssl_get_bytes_avail(&backend->ssl) != 0; |
| } |
| |
| static CURLcode mbedtls_sha256sum(const unsigned char *input, |
| size_t inputlen, |
| unsigned char *sha256sum, |
| size_t sha256len UNUSED_PARAM) |
| { |
| (void)sha256len; |
| #if MBEDTLS_VERSION_NUMBER < 0x02070000 |
| mbedtls_sha256(input, inputlen, sha256sum, 0); |
| #else |
| /* returns 0 on success, otherwise failure */ |
| if(mbedtls_sha256_ret(input, inputlen, sha256sum, 0) != 0) |
| return CURLE_BAD_FUNCTION_ARGUMENT; |
| #endif |
| return CURLE_OK; |
| } |
| |
| static void *mbedtls_get_internals(struct ssl_connect_data *connssl, |
| CURLINFO info UNUSED_PARAM) |
| { |
| struct ssl_backend_data *backend = connssl->backend; |
| (void)info; |
| return &backend->ssl; |
| } |
| |
| const struct Curl_ssl Curl_ssl_mbedtls = { |
| { CURLSSLBACKEND_MBEDTLS, "mbedtls" }, /* info */ |
| |
| SSLSUPP_CA_PATH | |
| SSLSUPP_PINNEDPUBKEY | |
| SSLSUPP_SSL_CTX, |
| |
| sizeof(struct ssl_backend_data), |
| |
| mbedtls_init, /* init */ |
| mbedtls_cleanup, /* cleanup */ |
| mbedtls_version, /* version */ |
| Curl_none_check_cxn, /* check_cxn */ |
| Curl_none_shutdown, /* shutdown */ |
| mbedtls_data_pending, /* data_pending */ |
| mbedtls_random, /* random */ |
| Curl_none_cert_status_request, /* cert_status_request */ |
| mbedtls_connect, /* connect */ |
| mbedtls_connect_nonblocking, /* connect_nonblocking */ |
| Curl_ssl_getsock, /* getsock */ |
| mbedtls_get_internals, /* get_internals */ |
| mbedtls_close, /* close_one */ |
| mbedtls_close_all, /* close_all */ |
| mbedtls_session_free, /* session_free */ |
| Curl_none_set_engine, /* set_engine */ |
| Curl_none_set_engine_default, /* set_engine_default */ |
| Curl_none_engines_list, /* engines_list */ |
| Curl_none_false_start, /* false_start */ |
| mbedtls_sha256sum, /* sha256sum */ |
| NULL, /* associate_connection */ |
| NULL /* disassociate_connection */ |
| }; |
| |
| #endif /* USE_MBEDTLS */ |
