| /* |
| * libwebsockets - mbedtls-specific client TLS code |
| * |
| * Copyright (C) 2010-2017 Andy Green <andy@warmcat.com> |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation: |
| * version 2.1 of the License. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, |
| * MA 02110-1301 USA |
| */ |
| |
| #include "core/private.h" |
| |
| static int |
| OpenSSL_client_verify_callback(int preverify_ok, X509_STORE_CTX *x509_ctx) |
| { |
| return 0; |
| } |
| |
| int |
| lws_ssl_client_bio_create(struct lws *wsi) |
| { |
| char hostname[128], *p; |
| const char *alpn_comma = wsi->context->tls.alpn_default; |
| struct alpn_ctx protos; |
| |
| if (lws_hdr_copy(wsi, hostname, sizeof(hostname), |
| _WSI_TOKEN_CLIENT_HOST) <= 0) { |
| lwsl_err("%s: Unable to get hostname\n", __func__); |
| |
| return -1; |
| } |
| |
| /* |
| * remove any :port part on the hostname... necessary for network |
| * connection but typical certificates do not contain it |
| */ |
| p = hostname; |
| while (*p) { |
| if (*p == ':') { |
| *p = '\0'; |
| break; |
| } |
| p++; |
| } |
| |
| wsi->tls.ssl = SSL_new(wsi->vhost->tls.ssl_client_ctx); |
| if (!wsi->tls.ssl) { |
| lwsl_info("%s: SSL_new() failed\n", __func__); |
| return -1; |
| } |
| |
| if (wsi->vhost->tls.ssl_info_event_mask) |
| SSL_set_info_callback(wsi->tls.ssl, lws_ssl_info_callback); |
| |
| if (!(wsi->tls.use_ssl & LCCSCF_SKIP_SERVER_CERT_HOSTNAME_CHECK)) { |
| X509_VERIFY_PARAM *param = SSL_get0_param(wsi->tls.ssl); |
| /* Enable automatic hostname checks */ |
| // X509_VERIFY_PARAM_set_hostflags(param, |
| // X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS); |
| X509_VERIFY_PARAM_set1_host(param, hostname, 0); |
| } |
| |
| if (wsi->vhost->tls.alpn) |
| alpn_comma = wsi->vhost->tls.alpn; |
| |
| if (lws_hdr_copy(wsi, hostname, sizeof(hostname), |
| _WSI_TOKEN_CLIENT_ALPN) > 0) |
| alpn_comma = hostname; |
| |
| lwsl_info("%s: %p: client conn sending ALPN list '%s'\n", |
| __func__, wsi, alpn_comma); |
| |
| protos.len = lws_alpn_comma_to_openssl(alpn_comma, protos.data, |
| sizeof(protos.data) - 1); |
| |
| /* with mbedtls, protos is not pointed to after exit from this call */ |
| SSL_set_alpn_select_cb(wsi->tls.ssl, &protos); |
| |
| /* |
| * use server name indication (SNI), if supported, |
| * when establishing connection |
| */ |
| SSL_set_verify(wsi->tls.ssl, SSL_VERIFY_PEER, |
| OpenSSL_client_verify_callback); |
| |
| SSL_set_fd(wsi->tls.ssl, wsi->desc.sockfd); |
| |
| return 0; |
| } |
| |
| int ERR_get_error(void) |
| { |
| return 0; |
| } |
| |
| enum lws_ssl_capable_status |
| lws_tls_client_connect(struct lws *wsi) |
| { |
| int m, n = SSL_connect(wsi->tls.ssl); |
| const unsigned char *prot; |
| unsigned int len; |
| |
| if (n == 1) { |
| SSL_get0_alpn_selected(wsi->tls.ssl, &prot, &len); |
| lws_role_call_alpn_negotiated(wsi, (const char *)prot); |
| lwsl_info("client connect OK\n"); |
| return LWS_SSL_CAPABLE_DONE; |
| } |
| |
| m = SSL_get_error(wsi->tls.ssl, n); |
| |
| if (m == SSL_ERROR_WANT_READ || SSL_want_read(wsi->tls.ssl)) |
| return LWS_SSL_CAPABLE_MORE_SERVICE_READ; |
| |
| if (m == SSL_ERROR_WANT_WRITE || SSL_want_write(wsi->tls.ssl)) |
| return LWS_SSL_CAPABLE_MORE_SERVICE_WRITE; |
| |
| if (!n) /* we don't know what he wants, but he says to retry */ |
| return LWS_SSL_CAPABLE_MORE_SERVICE; |
| |
| return LWS_SSL_CAPABLE_ERROR; |
| } |
| |
| int |
| lws_tls_client_confirm_peer_cert(struct lws *wsi, char *ebuf, int ebuf_len) |
| { |
| int n; |
| X509 *peer = SSL_get_peer_certificate(wsi->tls.ssl); |
| struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi]; |
| char *sb = (char *)&pt->serv_buf[0]; |
| |
| if (!peer) { |
| lwsl_info("peer did not provide cert\n"); |
| |
| return -1; |
| } |
| lwsl_info("peer provided cert\n"); |
| |
| n = SSL_get_verify_result(wsi->tls.ssl); |
| lws_latency(wsi->context, wsi, |
| "SSL_get_verify_result LWS_CONNMODE..HANDSHAKE", n, n > 0); |
| |
| lwsl_debug("get_verify says %d\n", n); |
| |
| if (n == X509_V_OK) |
| return 0; |
| |
| if (n == X509_V_ERR_HOSTNAME_MISMATCH && |
| (wsi->tls.use_ssl & LCCSCF_SKIP_SERVER_CERT_HOSTNAME_CHECK)) { |
| lwsl_info("accepting certificate for invalid hostname\n"); |
| return 0; |
| } |
| |
| if (n == X509_V_ERR_INVALID_CA && |
| (wsi->tls.use_ssl & LCCSCF_ALLOW_SELFSIGNED)) { |
| lwsl_info("accepting certificate from untrusted CA\n"); |
| return 0; |
| } |
| |
| if ((n == X509_V_ERR_CERT_NOT_YET_VALID || |
| n == X509_V_ERR_CERT_HAS_EXPIRED) && |
| (wsi->tls.use_ssl & LCCSCF_ALLOW_EXPIRED)) { |
| lwsl_info("accepting expired or not yet valid certificate\n"); |
| |
| return 0; |
| } |
| lws_snprintf(ebuf, ebuf_len, |
| "server's cert didn't look good, X509_V_ERR = %d: %s\n", |
| n, ERR_error_string(n, sb)); |
| lwsl_info("%s\n", ebuf); |
| lws_tls_err_describe(); |
| |
| return -1; |
| } |
| |
| int |
| lws_tls_client_create_vhost_context(struct lws_vhost *vh, |
| const struct lws_context_creation_info *info, |
| const char *cipher_list, |
| const char *ca_filepath, |
| const void *ca_mem, |
| unsigned int ca_mem_len, |
| const char *cert_filepath, |
| const void *cert_mem, |
| unsigned int cert_mem_len, |
| const char *private_key_filepath) |
| { |
| X509 *d2i_X509(X509 **cert, const unsigned char *buffer, long len); |
| SSL_METHOD *method = (SSL_METHOD *)TLS_client_method(); |
| unsigned long error; |
| lws_filepos_t len; |
| uint8_t *buf; |
| int n; |
| |
| if (!method) { |
| error = ERR_get_error(); |
| lwsl_err("problem creating ssl method %lu: %s\n", |
| error, ERR_error_string(error, |
| (char *)vh->context->pt[0].serv_buf)); |
| return 1; |
| } |
| /* create context */ |
| vh->tls.ssl_client_ctx = SSL_CTX_new(method); |
| if (!vh->tls.ssl_client_ctx) { |
| error = ERR_get_error(); |
| lwsl_err("problem creating ssl context %lu: %s\n", |
| error, ERR_error_string(error, |
| (char *)vh->context->pt[0].serv_buf)); |
| return 1; |
| } |
| |
| if (!ca_filepath && (!ca_mem || !ca_mem_len)) |
| return 0; |
| |
| if (ca_filepath) { |
| if (alloc_file(vh->context, ca_filepath, &buf, &len)) { |
| lwsl_err("Load CA cert file %s failed\n", ca_filepath); |
| return 1; |
| } |
| vh->tls.x509_client_CA = d2i_X509(NULL, buf, len); |
| free(buf); |
| lwsl_notice("Loading client CA for verification %s\n", ca_filepath); |
| } else { |
| vh->tls.x509_client_CA = d2i_X509(NULL, (uint8_t*)ca_mem, ca_mem_len); |
| lwsl_notice("%s: using mem client CA cert %d\n", |
| __func__, ca_mem_len); |
| } |
| |
| if (!vh->tls.x509_client_CA) { |
| lwsl_err("client CA: x509 parse failed\n"); |
| return 1; |
| } |
| |
| if (!vh->tls.ssl_ctx) |
| SSL_CTX_add_client_CA(vh->tls.ssl_client_ctx, vh->tls.x509_client_CA); |
| else |
| SSL_CTX_add_client_CA(vh->tls.ssl_ctx, vh->tls.x509_client_CA); |
| |
| /* support for client-side certificate authentication */ |
| if (cert_filepath) { |
| uint8_t *buf; |
| lws_filepos_t amount; |
| |
| if (lws_tls_use_any_upgrade_check_extant(cert_filepath) != |
| LWS_TLS_EXTANT_YES && |
| (info->options & LWS_SERVER_OPTION_IGNORE_MISSING_CERT)) |
| return 0; |
| |
| lwsl_notice("%s: doing cert filepath %s\n", __func__, |
| cert_filepath); |
| |
| if (alloc_file(vh->context, cert_filepath, &buf, &amount)) |
| return 1; |
| |
| buf[amount++] = '\0'; |
| |
| SSL_CTX_use_PrivateKey_ASN1(0, vh->tls.ssl_client_ctx, |
| buf, amount); |
| |
| n = SSL_CTX_use_certificate_ASN1(vh->tls.ssl_client_ctx, |
| amount, buf); |
| lws_free(buf); |
| if (n < 1) { |
| lwsl_err("problem %d getting cert '%s'\n", n, |
| cert_filepath); |
| lws_tls_err_describe(); |
| return 1; |
| } |
| |
| lwsl_notice("Loaded client cert %s\n", cert_filepath); |
| } else if (cert_mem && cert_mem_len) { |
| // lwsl_hexdump_notice(cert_mem, cert_mem_len - 1); |
| SSL_CTX_use_PrivateKey_ASN1(0, vh->tls.ssl_client_ctx, |
| cert_mem, cert_mem_len - 1); |
| n = SSL_CTX_use_certificate_ASN1(vh->tls.ssl_client_ctx, |
| cert_mem_len, cert_mem); |
| if (n < 1) { |
| lwsl_err("%s: problem interpreting client cert\n", |
| __func__); |
| lws_tls_err_describe(); |
| return 1; |
| } |
| lwsl_notice("%s: using mem client cert %d\n", |
| __func__, cert_mem_len); |
| } |
| |
| return 0; |
| } |