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/*
* 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)
{
X509_VERIFY_PARAM *param;
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)
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)) {
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_ssl_elaborate_error();
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 char *cert_filepath,
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;
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)
return 0;
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);
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);
lwsl_notice("client loaded CA for verification %s\n", ca_filepath);
return 0;
}
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