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1450 lines
45 KiB
C
1450 lines
45 KiB
C
/*-
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* SSLsplit - transparent SSL/TLS interception
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* https://www.roe.ch/SSLsplit
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*
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* Copyright (c) 2009-2018, Daniel Roethlisberger <daniel@roe.ch>.
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* Copyright (c) 2018, Soner Tari <sonertari@gmail.com>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "protossl.h"
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#include "prototcp.h"
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#include "protopassthrough.h"
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#include "pxysslshut.h"
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#include "cachemgr.h"
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#include <string.h>
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#include <sys/param.h>
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#include <event2/bufferevent_ssl.h>
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/*
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* Context used for all server sessions.
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*/
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#ifdef USE_SSL_SESSION_ID_CONTEXT
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static unsigned long ssl_session_context = 0x31415926;
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#endif /* USE_SSL_SESSION_ID_CONTEXT */
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void
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protossl_log_ssl_error(struct bufferevent *bev, UNUSED pxy_conn_ctx_t *ctx)
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{
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unsigned long sslerr;
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/* Can happen for socket errs, ssl errs;
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* may happen for unclean ssl socket shutdowns. */
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sslerr = bufferevent_get_openssl_error(bev);
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if (!errno && !sslerr) {
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#if LIBEVENT_VERSION_NUMBER >= 0x02010000
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/* We have disabled notification for unclean shutdowns
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* so this should not happen; log a warning. */
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log_err_level_printf(LOG_WARNING, "Spurious error from bufferevent (errno=0,sslerr=0)\n");
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#else /* LIBEVENT_VERSION_NUMBER < 0x02010000 */
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/* Older versions of libevent will report these. */
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if (OPTS_DEBUG(ctx->opts)) {
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log_dbg_printf("Unclean SSL shutdown, fd=%d\n", ctx->fd);
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}
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#endif /* LIBEVENT_VERSION_NUMBER < 0x02010000 */
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} else if (ERR_GET_REASON(sslerr) == SSL_R_SSLV3_ALERT_HANDSHAKE_FAILURE) {
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/* these can happen due to client cert auth,
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* only log error if debugging is activated */
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log_dbg_printf("Error from bufferevent: %i:%s %lu:%i:%s:%i:%s:%i:%s\n",
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errno, errno ? strerror(errno) : "-", sslerr,
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ERR_GET_REASON(sslerr), sslerr ? ERR_reason_error_string(sslerr) : "-",
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ERR_GET_LIB(sslerr), sslerr ? ERR_lib_error_string(sslerr) : "-",
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ERR_GET_FUNC(sslerr), sslerr ? ERR_func_error_string(sslerr) : "-");
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while ((sslerr = bufferevent_get_openssl_error(bev))) {
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log_dbg_printf("Additional SSL error: %lu:%i:%s:%i:%s:%i:%s\n",
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sslerr,
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ERR_GET_REASON(sslerr), ERR_reason_error_string(sslerr),
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ERR_GET_LIB(sslerr), ERR_lib_error_string(sslerr),
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ERR_GET_FUNC(sslerr), ERR_func_error_string(sslerr));
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}
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} else {
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/* real errors */
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log_err_printf("Error from bufferevent: %i:%s %lu:%i:%s:%i:%s:%i:%s\n",
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errno, errno ? strerror(errno) : "-",
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sslerr,
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ERR_GET_REASON(sslerr), sslerr ? ERR_reason_error_string(sslerr) : "-",
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ERR_GET_LIB(sslerr), sslerr ? ERR_lib_error_string(sslerr) : "-",
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ERR_GET_FUNC(sslerr), sslerr ? ERR_func_error_string(sslerr) : "-");
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while ((sslerr = bufferevent_get_openssl_error(bev))) {
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log_err_printf("Additional SSL error: %lu:%i:%s:%i:%s:%i:%s\n",
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sslerr,
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ERR_GET_REASON(sslerr), ERR_reason_error_string(sslerr),
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ERR_GET_LIB(sslerr), ERR_lib_error_string(sslerr),
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ERR_GET_FUNC(sslerr), ERR_func_error_string(sslerr));
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}
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}
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}
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int
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protossl_log_masterkey(pxy_conn_ctx_t *ctx, pxy_conn_desc_t *this)
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{
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// XXX: Remove ssl check? But the caller function is called by non-ssl protos.
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if (this->ssl) {
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/* log master key */
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if (ctx->opts->masterkeylog) {
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char *keystr;
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keystr = ssl_ssl_masterkey_to_str(this->ssl);
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if ((keystr == NULL) ||
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(log_masterkey_print_free(keystr) == -1)) {
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if (errno == ENOMEM)
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ctx->enomem = 1;
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pxy_conn_term(ctx, 1);
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return -1;
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}
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}
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}
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return 0;
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}
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/* forward declaration of OpenSSL callbacks */
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#ifndef OPENSSL_NO_TLSEXT
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static int protossl_ossl_servername_cb(SSL *ssl, int *al, void *arg);
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#endif /* !OPENSSL_NO_TLSEXT */
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static int protossl_ossl_sessnew_cb(SSL *, SSL_SESSION *);
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static void protossl_ossl_sessremove_cb(SSL_CTX *, SSL_SESSION *);
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#if (OPENSSL_VERSION_NUMBER < 0x10100000L) || (defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x20800000L)
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static SSL_SESSION * protossl_ossl_sessget_cb(SSL *, unsigned char *, int, int *);
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#else /* OPENSSL_VERSION_NUMBER >= 0x10100000L */
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static SSL_SESSION * protossl_ossl_sessget_cb(SSL *, const unsigned char *, int, int *);
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#endif /* OPENSSL_VERSION_NUMBER >= 0x10100000L */
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/*
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* Dump information on a certificate to the debug log.
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*/
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static void
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protossl_debug_crt(X509 *crt)
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{
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char *sj = ssl_x509_subject(crt);
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if (sj) {
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log_dbg_printf("Subject DN: %s\n", sj);
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free(sj);
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}
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char *names = ssl_x509_names_to_str(crt);
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if (names) {
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log_dbg_printf("Common Names: %s\n", names);
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free(names);
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}
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char *fpr;
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if (!(fpr = ssl_x509_fingerprint(crt, 1))) {
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log_err_level_printf(LOG_WARNING, "Error generating X509 fingerprint\n");
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} else {
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log_dbg_printf("Fingerprint: %s\n", fpr);
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free(fpr);
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}
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#ifdef DEBUG_CERTIFICATE
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/* dump certificate */
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log_dbg_print_free(ssl_x509_to_str(crt));
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log_dbg_print_free(ssl_x509_to_pem(crt));
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#endif /* DEBUG_CERTIFICATE */
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}
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/*
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* Called by OpenSSL when a new src SSL session is created.
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* OpenSSL increments the refcount before calling the callback and will
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* decrement it again if we return 0. Returning 1 will make OpenSSL skip
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* the refcount decrementing. In other words, return 0 if we did not
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* keep a pointer to the object (which we never do here).
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*/
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#ifdef HAVE_SSLV2
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#define MAYBE_UNUSED
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#else /* !HAVE_SSLV2 */
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#define MAYBE_UNUSED UNUSED
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#endif /* !HAVE_SSLV2 */
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static int
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protossl_ossl_sessnew_cb(MAYBE_UNUSED SSL *ssl, SSL_SESSION *sess)
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#undef MAYBE_UNUSED
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{
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#ifdef DEBUG_SESSION_CACHE
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log_dbg_printf("===> OpenSSL new session callback:\n");
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if (sess) {
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log_dbg_print_free(ssl_session_to_str(sess));
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} else {
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log_dbg_printf("(null)\n");
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}
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#endif /* DEBUG_SESSION_CACHE */
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#ifdef HAVE_SSLV2
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/* Session resumption seems to fail for SSLv2 with protocol
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* parsing errors, so we disable caching for SSLv2. */
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if (SSL_version(ssl) == SSL2_VERSION) {
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log_err_level_printf(LOG_WARNING, "Session resumption denied to SSLv2"
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"client.\n");
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return 0;
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}
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#endif /* HAVE_SSLV2 */
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if (sess) {
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cachemgr_ssess_set(sess);
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}
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return 0;
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}
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/*
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* Called by OpenSSL when a src SSL session should be removed.
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* OpenSSL calls SSL_SESSION_free() after calling the callback;
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* we do not need to free the reference here.
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*/
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static void
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protossl_ossl_sessremove_cb(UNUSED SSL_CTX *sslctx, SSL_SESSION *sess)
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{
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#ifdef DEBUG_SESSION_CACHE
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log_dbg_printf("===> OpenSSL remove session callback:\n");
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if (sess) {
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log_dbg_print_free(ssl_session_to_str(sess));
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} else {
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log_dbg_printf("(null)\n");
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}
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#endif /* DEBUG_SESSION_CACHE */
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if (sess) {
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cachemgr_ssess_del(sess);
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}
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}
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/*
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* Called by OpenSSL when a src SSL session is requested by the client.
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*/
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static SSL_SESSION *
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#if (OPENSSL_VERSION_NUMBER < 0x10100000L) || (defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x20800000L)
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protossl_ossl_sessget_cb(UNUSED SSL *ssl, unsigned char *id, int idlen, int *copy)
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#else /* OPENSSL_VERSION_NUMBER >= 0x10100000L */
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protossl_ossl_sessget_cb(UNUSED SSL *ssl, const unsigned char *id, int idlen, int *copy)
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#endif /* OPENSSL_VERSION_NUMBER >= 0x10100000L */
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{
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SSL_SESSION *sess;
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#ifdef DEBUG_SESSION_CACHE
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log_dbg_printf("===> OpenSSL get session callback:\n");
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#endif /* DEBUG_SESSION_CACHE */
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*copy = 0; /* SSL should not increment reference count of session */
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sess = cachemgr_ssess_get(id, idlen);
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#ifdef DEBUG_SESSION_CACHE
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if (sess) {
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log_dbg_print_free(ssl_session_to_str(sess));
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}
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#endif /* DEBUG_SESSION_CACHE */
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log_dbg_printf("SSL session cache: %s\n", sess ? "HIT" : "MISS");
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return sess;
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}
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/*
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* Set SSL_CTX options that are the same for incoming and outgoing SSL_CTX.
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*/
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static void
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protossl_sslctx_setoptions(SSL_CTX *sslctx, pxy_conn_ctx_t *ctx)
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{
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SSL_CTX_set_options(sslctx, SSL_OP_ALL);
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#ifdef SSL_OP_TLS_ROLLBACK_BUG
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SSL_CTX_set_options(sslctx, SSL_OP_TLS_ROLLBACK_BUG);
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#endif /* SSL_OP_TLS_ROLLBACK_BUG */
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#ifdef SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION
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SSL_CTX_set_options(sslctx, SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION);
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#endif /* SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION */
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#ifdef SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS
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SSL_CTX_set_options(sslctx, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS);
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#endif /* SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS */
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#ifdef SSL_OP_NO_TICKET
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SSL_CTX_set_options(sslctx, SSL_OP_NO_TICKET);
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#endif /* SSL_OP_NO_TICKET */
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#ifdef SSL_OP_NO_SSLv2
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#ifdef HAVE_SSLV2
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if (ctx->opts->no_ssl2) {
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#endif /* HAVE_SSLV2 */
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SSL_CTX_set_options(sslctx, SSL_OP_NO_SSLv2);
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#ifdef HAVE_SSLV2
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}
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#endif /* HAVE_SSLV2 */
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#endif /* !SSL_OP_NO_SSLv2 */
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#ifdef HAVE_SSLV3
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if (ctx->opts->no_ssl3) {
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SSL_CTX_set_options(sslctx, SSL_OP_NO_SSLv3);
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}
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#endif /* HAVE_SSLV3 */
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#ifdef HAVE_TLSV10
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if (ctx->opts->no_tls10) {
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SSL_CTX_set_options(sslctx, SSL_OP_NO_TLSv1);
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}
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#endif /* HAVE_TLSV10 */
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#ifdef HAVE_TLSV11
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if (ctx->opts->no_tls11) {
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SSL_CTX_set_options(sslctx, SSL_OP_NO_TLSv1_1);
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}
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#endif /* HAVE_TLSV11 */
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#ifdef HAVE_TLSV12
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if (ctx->opts->no_tls12) {
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SSL_CTX_set_options(sslctx, SSL_OP_NO_TLSv1_2);
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}
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#endif /* HAVE_TLSV12 */
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#ifdef SSL_OP_NO_COMPRESSION
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if (!ctx->opts->sslcomp) {
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SSL_CTX_set_options(sslctx, SSL_OP_NO_COMPRESSION);
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}
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#endif /* SSL_OP_NO_COMPRESSION */
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SSL_CTX_set_cipher_list(sslctx, ctx->opts->ciphers);
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}
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/*
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* Create and set up a new SSL_CTX instance for terminating SSL.
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* Set up all the necessary callbacks, the certificate, the cert chain and key.
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*/
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static SSL_CTX *
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protossl_srcsslctx_create(pxy_conn_ctx_t *ctx, X509 *crt, STACK_OF(X509) *chain,
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EVP_PKEY *key)
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{
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SSL_CTX *sslctx = SSL_CTX_new(ctx->opts->sslmethod());
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if (!sslctx)
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return NULL;
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protossl_sslctx_setoptions(sslctx, ctx);
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#if (OPENSSL_VERSION_NUMBER >= 0x10100000L) && !defined(LIBRESSL_VERSION_NUMBER)
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if (ctx->opts->sslversion) {
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if (SSL_CTX_set_min_proto_version(sslctx, ctx->opts->sslversion) == 0 ||
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SSL_CTX_set_max_proto_version(sslctx, ctx->opts->sslversion) == 0) {
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SSL_CTX_free(sslctx);
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return NULL;
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}
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}
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#endif /* OPENSSL_VERSION_NUMBER >= 0x10100000L */
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SSL_CTX_sess_set_new_cb(sslctx, protossl_ossl_sessnew_cb);
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SSL_CTX_sess_set_remove_cb(sslctx, protossl_ossl_sessremove_cb);
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SSL_CTX_sess_set_get_cb(sslctx, protossl_ossl_sessget_cb);
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SSL_CTX_set_session_cache_mode(sslctx, SSL_SESS_CACHE_SERVER |
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SSL_SESS_CACHE_NO_INTERNAL);
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#ifdef USE_SSL_SESSION_ID_CONTEXT
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SSL_CTX_set_session_id_context(sslctx, (void *)(&ssl_session_context),
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sizeof(ssl_session_context));
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#endif /* USE_SSL_SESSION_ID_CONTEXT */
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#ifndef OPENSSL_NO_TLSEXT
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SSL_CTX_set_tlsext_servername_callback(sslctx, protossl_ossl_servername_cb);
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SSL_CTX_set_tlsext_servername_arg(sslctx, ctx);
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#endif /* !OPENSSL_NO_TLSEXT */
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#ifndef OPENSSL_NO_DH
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if (ctx->opts->dh) {
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SSL_CTX_set_tmp_dh(sslctx, ctx->opts->dh);
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} else {
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SSL_CTX_set_tmp_dh_callback(sslctx, ssl_tmp_dh_callback);
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}
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#endif /* !OPENSSL_NO_DH */
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#ifndef OPENSSL_NO_ECDH
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if (ctx->opts->ecdhcurve) {
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EC_KEY *ecdh = ssl_ec_by_name(ctx->opts->ecdhcurve);
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SSL_CTX_set_tmp_ecdh(sslctx, ecdh);
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EC_KEY_free(ecdh);
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} else {
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EC_KEY *ecdh = ssl_ec_by_name(NULL);
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SSL_CTX_set_tmp_ecdh(sslctx, ecdh);
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EC_KEY_free(ecdh);
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}
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#endif /* !OPENSSL_NO_ECDH */
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SSL_CTX_use_certificate(sslctx, crt);
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SSL_CTX_use_PrivateKey(sslctx, key);
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for (int i = 0; i < sk_X509_num(chain); i++) {
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X509 *c = sk_X509_value(chain, i);
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ssl_x509_refcount_inc(c); /* next call consumes a reference */
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SSL_CTX_add_extra_chain_cert(sslctx, c);
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}
|
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|
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#ifdef DEBUG_SESSION_CACHE
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if (OPTS_DEBUG(ctx->opts)) {
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int mode = SSL_CTX_get_session_cache_mode(sslctx);
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log_dbg_printf("SSL session cache mode: %08x\n", mode);
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if (mode == SSL_SESS_CACHE_OFF)
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log_dbg_printf("SSL_SESS_CACHE_OFF\n");
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if (mode & SSL_SESS_CACHE_CLIENT)
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log_dbg_printf("SSL_SESS_CACHE_CLIENT\n");
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if (mode & SSL_SESS_CACHE_SERVER)
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log_dbg_printf("SSL_SESS_CACHE_SERVER\n");
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if (mode & SSL_SESS_CACHE_NO_AUTO_CLEAR)
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log_dbg_printf("SSL_SESS_CACHE_NO_AUTO_CLEAR\n");
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if (mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)
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log_dbg_printf("SSL_SESS_CACHE_NO_INTERNAL_LOOKUP\n");
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if (mode & SSL_SESS_CACHE_NO_INTERNAL_STORE)
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log_dbg_printf("SSL_SESS_CACHE_NO_INTERNAL_STORE\n");
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}
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#endif /* DEBUG_SESSION_CACHE */
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return sslctx;
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}
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static int
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protossl_srccert_write_to_gendir(pxy_conn_ctx_t *ctx, X509 *crt, int is_orig)
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{
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char *fn;
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int rv;
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|
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if (!ctx->sslctx->origcrtfpr)
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return -1;
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if (is_orig) {
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rv = asprintf(&fn, "%s/%s.crt", ctx->opts->certgendir,
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ctx->sslctx->origcrtfpr);
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} else {
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if (!ctx->sslctx->usedcrtfpr)
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return -1;
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rv = asprintf(&fn, "%s/%s-%s.crt", ctx->opts->certgendir,
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ctx->sslctx->origcrtfpr, ctx->sslctx->usedcrtfpr);
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}
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if (rv == -1) {
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ctx->enomem = 1;
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return -1;
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}
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rv = log_cert_submit(fn, crt);
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free(fn);
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return rv;
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}
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|
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void
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protossl_srccert_write(pxy_conn_ctx_t *ctx)
|
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{
|
|
if (ctx->opts->certgen_writeall || ctx->sslctx->generated_cert) {
|
|
if (protossl_srccert_write_to_gendir(ctx,
|
|
SSL_get_certificate(ctx->src.ssl), 0) == -1) {
|
|
log_err_level_printf(LOG_CRIT, "Failed to write used certificate\n");
|
|
}
|
|
}
|
|
if (ctx->opts->certgen_writeall) {
|
|
if (protossl_srccert_write_to_gendir(ctx, ctx->sslctx->origcrt, 1) == -1) {
|
|
log_err_level_printf(LOG_CRIT, "Failed to write orig certificate\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
static cert_t *
|
|
protossl_srccert_create(pxy_conn_ctx_t *ctx)
|
|
{
|
|
cert_t *cert = NULL;
|
|
|
|
if (ctx->opts->tgcrtdir) {
|
|
if (ctx->sslctx->sni) {
|
|
cert = cachemgr_tgcrt_get(ctx->sslctx->sni);
|
|
if (!cert) {
|
|
char *wildcarded;
|
|
wildcarded = ssl_wildcardify(ctx->sslctx->sni);
|
|
if (!wildcarded) {
|
|
ctx->enomem = 1;
|
|
return NULL;
|
|
}
|
|
cert = cachemgr_tgcrt_get(wildcarded);
|
|
free(wildcarded);
|
|
}
|
|
if (cert && OPTS_DEBUG(ctx->opts)) {
|
|
log_dbg_printf("Target cert by SNI\n");
|
|
}
|
|
} else if (ctx->sslctx->origcrt) {
|
|
char **names = ssl_x509_names(ctx->sslctx->origcrt);
|
|
for (char **p = names; *p; p++) {
|
|
if (!cert) {
|
|
cert = cachemgr_tgcrt_get(*p);
|
|
}
|
|
if (!cert) {
|
|
char *wildcarded;
|
|
wildcarded = ssl_wildcardify(*p);
|
|
if (!wildcarded) {
|
|
ctx->enomem = 1;
|
|
} else {
|
|
cert = cachemgr_tgcrt_get(
|
|
wildcarded);
|
|
free(wildcarded);
|
|
}
|
|
}
|
|
free(*p);
|
|
}
|
|
free(names);
|
|
if (ctx->enomem) {
|
|
return NULL;
|
|
}
|
|
if (cert && OPTS_DEBUG(ctx->opts)) {
|
|
log_dbg_printf("Target cert by origcrt\n");
|
|
}
|
|
}
|
|
|
|
if (cert) {
|
|
ctx->sslctx->immutable_cert = 1;
|
|
}
|
|
}
|
|
|
|
if (!cert && ctx->sslctx->origcrt && ctx->opts->key) {
|
|
cert = cert_new();
|
|
|
|
cert->crt = cachemgr_fkcrt_get(ctx->sslctx->origcrt);
|
|
if (cert->crt) {
|
|
if (OPTS_DEBUG(ctx->opts))
|
|
log_dbg_printf("Certificate cache: HIT\n");
|
|
} else {
|
|
if (OPTS_DEBUG(ctx->opts))
|
|
log_dbg_printf("Certificate cache: MISS\n");
|
|
cert->crt = ssl_x509_forge(ctx->opts->cacrt,
|
|
ctx->opts->cakey,
|
|
ctx->sslctx->origcrt,
|
|
ctx->opts->key,
|
|
NULL,
|
|
ctx->opts->crlurl);
|
|
cachemgr_fkcrt_set(ctx->sslctx->origcrt, cert->crt);
|
|
}
|
|
cert_set_key(cert, ctx->opts->key);
|
|
cert_set_chain(cert, ctx->opts->chain);
|
|
ctx->sslctx->generated_cert = 1;
|
|
}
|
|
|
|
if ((WANT_CONNECT_LOG(ctx) || ctx->opts->certgendir) && ctx->sslctx->origcrt) {
|
|
ctx->sslctx->origcrtfpr = ssl_x509_fingerprint(ctx->sslctx->origcrt, 0);
|
|
if (!ctx->sslctx->origcrtfpr)
|
|
ctx->enomem = 1;
|
|
}
|
|
if ((WANT_CONNECT_LOG(ctx) || ctx->opts->certgen_writeall) &&
|
|
cert && cert->crt) {
|
|
ctx->sslctx->usedcrtfpr = ssl_x509_fingerprint(cert->crt, 0);
|
|
if (!ctx->sslctx->usedcrtfpr)
|
|
ctx->enomem = 1;
|
|
}
|
|
|
|
return cert;
|
|
}
|
|
|
|
/*
|
|
* Create new SSL context for the incoming connection, based on the original
|
|
* destination SSL certificate.
|
|
* Returns NULL if no suitable certificate could be found.
|
|
*/
|
|
static SSL *
|
|
protossl_srcssl_create(pxy_conn_ctx_t *ctx, SSL *origssl)
|
|
{
|
|
cert_t *cert;
|
|
|
|
cachemgr_dsess_set((struct sockaddr*)&ctx->dstaddr,
|
|
ctx->dstaddrlen, ctx->sslctx->sni,
|
|
SSL_get0_session(origssl));
|
|
|
|
ctx->sslctx->origcrt = SSL_get_peer_certificate(origssl);
|
|
|
|
if (OPTS_DEBUG(ctx->opts)) {
|
|
if (ctx->sslctx->origcrt) {
|
|
log_dbg_printf("===> Original server certificate:\n");
|
|
protossl_debug_crt(ctx->sslctx->origcrt);
|
|
} else {
|
|
log_dbg_printf("===> Original server has no cert!\n");
|
|
}
|
|
}
|
|
|
|
cert = protossl_srccert_create(ctx);
|
|
if (!cert)
|
|
return NULL;
|
|
|
|
if (OPTS_DEBUG(ctx->opts)) {
|
|
log_dbg_printf("===> Forged server certificate:\n");
|
|
protossl_debug_crt(cert->crt);
|
|
}
|
|
|
|
if (WANT_CONNECT_LOG(ctx)) {
|
|
ctx->sslctx->ssl_names = ssl_x509_names_to_str(ctx->sslctx->origcrt ?
|
|
ctx->sslctx->origcrt :
|
|
cert->crt);
|
|
if (!ctx->sslctx->ssl_names)
|
|
ctx->enomem = 1;
|
|
}
|
|
|
|
SSL_CTX *sslctx = protossl_srcsslctx_create(ctx, cert->crt, cert->chain,
|
|
cert->key);
|
|
cert_free(cert);
|
|
if (!sslctx) {
|
|
ctx->enomem = 1;
|
|
return NULL;
|
|
}
|
|
SSL *ssl = SSL_new(sslctx);
|
|
SSL_CTX_free(sslctx); /* SSL_new() increments refcount */
|
|
if (!ssl) {
|
|
ctx->enomem = 1;
|
|
return NULL;
|
|
}
|
|
#ifdef SSL_MODE_RELEASE_BUFFERS
|
|
/* lower memory footprint for idle connections */
|
|
SSL_set_mode(ssl, SSL_get_mode(ssl) | SSL_MODE_RELEASE_BUFFERS);
|
|
#endif /* SSL_MODE_RELEASE_BUFFERS */
|
|
return ssl;
|
|
}
|
|
|
|
#ifndef OPENSSL_NO_TLSEXT
|
|
/*
|
|
* OpenSSL servername callback, called when OpenSSL receives a servername
|
|
* TLS extension in the clientHello. Must switch to a new SSL_CTX with
|
|
* a different certificate if we want to replace the server cert here.
|
|
* We generate a new certificate if the current one does not match the
|
|
* supplied servername. This should only happen if the original destination
|
|
* server supplies a certificate which does not match the server name we
|
|
* indicate to it.
|
|
*/
|
|
static int
|
|
protossl_ossl_servername_cb(SSL *ssl, UNUSED int *al, void *arg)
|
|
{
|
|
pxy_conn_ctx_t *ctx = arg;
|
|
const char *sn;
|
|
X509 *sslcrt;
|
|
|
|
if (!(sn = SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name)))
|
|
return SSL_TLSEXT_ERR_NOACK;
|
|
|
|
if (!ctx->sslctx->sni) {
|
|
if (OPTS_DEBUG(ctx->opts)) {
|
|
log_dbg_printf("Warning: SNI parser yielded no "
|
|
"hostname, copying OpenSSL one: "
|
|
"[NULL] != [%s]\n", sn);
|
|
}
|
|
ctx->sslctx->sni = strdup(sn);
|
|
if (!ctx->sslctx->sni) {
|
|
ctx->enomem = 1;
|
|
return SSL_TLSEXT_ERR_NOACK;
|
|
}
|
|
}
|
|
if (OPTS_DEBUG(ctx->opts)) {
|
|
if (!!strcmp(sn, ctx->sslctx->sni)) {
|
|
/*
|
|
* This may happen if the client resumes a session, but
|
|
* uses a different SNI hostname when resuming than it
|
|
* used when the session was created. OpenSSL
|
|
* correctly ignores the SNI in the ClientHello in this
|
|
* case, but since we have already sent the SNI onwards
|
|
* to the original destination, there is no way back.
|
|
* We log an error and hope this never happens.
|
|
*/
|
|
log_dbg_printf("Warning: SNI parser yielded different "
|
|
"hostname than OpenSSL callback for "
|
|
"the same ClientHello message: "
|
|
"[%s] != [%s]\n", ctx->sslctx->sni, sn);
|
|
}
|
|
}
|
|
|
|
/* generate a new certificate with sn as additional altSubjectName
|
|
* and replace it both in the current SSL ctx and in the cert cache */
|
|
if (ctx->opts->allow_wrong_host && !ctx->sslctx->immutable_cert &&
|
|
!ssl_x509_names_match((sslcrt = SSL_get_certificate(ssl)), sn)) {
|
|
X509 *newcrt;
|
|
SSL_CTX *newsslctx;
|
|
|
|
if (OPTS_DEBUG(ctx->opts)) {
|
|
log_dbg_printf("Certificate cache: UPDATE "
|
|
"(SNI mismatch)\n");
|
|
}
|
|
newcrt = ssl_x509_forge(ctx->opts->cacrt, ctx->opts->cakey,
|
|
sslcrt, ctx->opts->key,
|
|
sn, ctx->opts->crlurl);
|
|
if (!newcrt) {
|
|
ctx->enomem = 1;
|
|
return SSL_TLSEXT_ERR_NOACK;
|
|
}
|
|
cachemgr_fkcrt_set(ctx->sslctx->origcrt, newcrt);
|
|
ctx->sslctx->generated_cert = 1;
|
|
if (OPTS_DEBUG(ctx->opts)) {
|
|
log_dbg_printf("===> Updated forged server "
|
|
"certificate:\n");
|
|
protossl_debug_crt(newcrt);
|
|
}
|
|
if (WANT_CONNECT_LOG(ctx)) {
|
|
if (ctx->sslctx->ssl_names) {
|
|
free(ctx->sslctx->ssl_names);
|
|
}
|
|
ctx->sslctx->ssl_names = ssl_x509_names_to_str(newcrt);
|
|
if (!ctx->sslctx->ssl_names) {
|
|
ctx->enomem = 1;
|
|
}
|
|
}
|
|
if (WANT_CONNECT_LOG(ctx) || ctx->opts->certgendir) {
|
|
if (ctx->sslctx->usedcrtfpr) {
|
|
free(ctx->sslctx->usedcrtfpr);
|
|
}
|
|
ctx->sslctx->usedcrtfpr = ssl_x509_fingerprint(newcrt, 0);
|
|
if (!ctx->sslctx->usedcrtfpr) {
|
|
ctx->enomem = 1;
|
|
}
|
|
}
|
|
|
|
newsslctx = protossl_srcsslctx_create(ctx, newcrt, ctx->opts->chain,
|
|
ctx->opts->key);
|
|
if (!newsslctx) {
|
|
X509_free(newcrt);
|
|
ctx->enomem = 1;
|
|
return SSL_TLSEXT_ERR_NOACK;
|
|
}
|
|
SSL_set_SSL_CTX(ssl, newsslctx); /* decr's old incr new refc */
|
|
SSL_CTX_free(newsslctx);
|
|
X509_free(newcrt);
|
|
} else if (OPTS_DEBUG(ctx->opts)) {
|
|
log_dbg_printf("Certificate cache: KEEP (SNI match or "
|
|
"target mode)\n");
|
|
}
|
|
|
|
return SSL_TLSEXT_ERR_OK;
|
|
}
|
|
#endif /* !OPENSSL_NO_TLSEXT */
|
|
|
|
/*
|
|
* Create new SSL context for outgoing connections to the original destination.
|
|
* If hostname sni is provided, use it for Server Name Indication.
|
|
*/
|
|
SSL *
|
|
protossl_dstssl_create(pxy_conn_ctx_t *ctx)
|
|
{
|
|
SSL_CTX *sslctx;
|
|
SSL *ssl;
|
|
SSL_SESSION *sess;
|
|
|
|
sslctx = SSL_CTX_new(ctx->opts->sslmethod());
|
|
if (!sslctx) {
|
|
ctx->enomem = 1;
|
|
return NULL;
|
|
}
|
|
|
|
protossl_sslctx_setoptions(sslctx, ctx);
|
|
|
|
#if (OPENSSL_VERSION_NUMBER >= 0x10100000L) && !defined(LIBRESSL_VERSION_NUMBER)
|
|
if (ctx->opts->sslversion) {
|
|
if (SSL_CTX_set_min_proto_version(sslctx, ctx->opts->sslversion) == 0 ||
|
|
SSL_CTX_set_max_proto_version(sslctx, ctx->opts->sslversion) == 0) {
|
|
SSL_CTX_free(sslctx);
|
|
ctx->enomem = 1;
|
|
return NULL;
|
|
}
|
|
}
|
|
#endif /* OPENSSL_VERSION_NUMBER >= 0x10100000L */
|
|
|
|
if (ctx->opts->verify_peer) {
|
|
SSL_CTX_set_verify(sslctx, SSL_VERIFY_PEER, NULL);
|
|
SSL_CTX_set_default_verify_paths(sslctx);
|
|
} else {
|
|
SSL_CTX_set_verify(sslctx, SSL_VERIFY_NONE, NULL);
|
|
}
|
|
|
|
if (ctx->opts->clientcrt) {
|
|
if (!SSL_CTX_use_certificate(sslctx, ctx->opts->clientcrt))
|
|
log_dbg_printf("loading client certificate failed");
|
|
}
|
|
if (ctx->opts->clientkey) {
|
|
if (!SSL_CTX_use_PrivateKey(sslctx, ctx->opts->clientkey))
|
|
log_dbg_printf("loading client key failed");
|
|
}
|
|
|
|
ssl = SSL_new(sslctx);
|
|
SSL_CTX_free(sslctx); /* SSL_new() increments refcount */
|
|
if (!ssl) {
|
|
ctx->enomem = 1;
|
|
return NULL;
|
|
}
|
|
#ifndef OPENSSL_NO_TLSEXT
|
|
if (ctx->sslctx->sni) {
|
|
SSL_set_tlsext_host_name(ssl, ctx->sslctx->sni);
|
|
}
|
|
#endif /* !OPENSSL_NO_TLSEXT */
|
|
|
|
#ifdef SSL_MODE_RELEASE_BUFFERS
|
|
/* lower memory footprint for idle connections */
|
|
SSL_set_mode(ssl, SSL_get_mode(ssl) | SSL_MODE_RELEASE_BUFFERS);
|
|
#endif /* SSL_MODE_RELEASE_BUFFERS */
|
|
|
|
/* session resuming based on remote endpoint address and port */
|
|
sess = cachemgr_dsess_get((struct sockaddr *)&ctx->dstaddr,
|
|
ctx->dstaddrlen, ctx->sslctx->sni); /* new sess inst */
|
|
if (sess) {
|
|
if (OPTS_DEBUG(ctx->opts)) {
|
|
log_dbg_printf("Attempt reuse dst SSL session\n");
|
|
}
|
|
SSL_set_session(ssl, sess); /* increments sess refcount */
|
|
SSL_SESSION_free(sess);
|
|
}
|
|
|
|
return ssl;
|
|
}
|
|
|
|
/*
|
|
* Set up a bufferevent structure for either a dst or src connection,
|
|
* optionally with or without SSL. Sets all callbacks, enables read
|
|
* and write events, but does not call bufferevent_socket_connect().
|
|
*
|
|
* For dst connections, pass -1 as fd. Pass a pointer to an initialized
|
|
* SSL struct as ssl if the connection should use SSL.
|
|
*
|
|
* Returns pointer to initialized bufferevent structure, as returned
|
|
* by bufferevent_socket_new() or bufferevent_openssl_socket_new().
|
|
*/
|
|
static struct bufferevent * NONNULL(1,3)
|
|
protossl_bufferevent_setup(pxy_conn_ctx_t *ctx, evutil_socket_t fd, SSL *ssl)
|
|
{
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protossl_bufferevent_setup: ENTER, fd=%d\n", fd);
|
|
#endif /* DEBUG_PROXY */
|
|
|
|
struct bufferevent *bev = bufferevent_openssl_socket_new(ctx->evbase, fd, ssl,
|
|
((fd == -1) ? BUFFEREVENT_SSL_CONNECTING : BUFFEREVENT_SSL_ACCEPTING), BEV_OPT_DEFER_CALLBACKS);
|
|
if (!bev) {
|
|
log_err_level_printf(LOG_CRIT, "Error creating bufferevent socket\n");
|
|
return NULL;
|
|
}
|
|
#if LIBEVENT_VERSION_NUMBER >= 0x02010000
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protossl_bufferevent_setup: bufferevent_openssl_set_allow_dirty_shutdown\n");
|
|
#endif /* DEBUG_PROXY */
|
|
|
|
/* Prevent unclean (dirty) shutdowns to cause error
|
|
* events on the SSL socket bufferevent. */
|
|
bufferevent_openssl_set_allow_dirty_shutdown(bev, 1);
|
|
#endif /* LIBEVENT_VERSION_NUMBER >= 0x02010000 */
|
|
|
|
// @attention Do not set callbacks here, srvdst does not set r cb
|
|
//bufferevent_setcb(bev, pxy_bev_readcb, pxy_bev_writecb, pxy_bev_eventcb, ctx);
|
|
// @todo Should we enable events here?
|
|
//bufferevent_enable(bev, EV_READ|EV_WRITE);
|
|
return bev;
|
|
}
|
|
|
|
static struct bufferevent * NONNULL(1,3)
|
|
protossl_bufferevent_setup_child(pxy_conn_child_ctx_t *ctx, evutil_socket_t fd, SSL *ssl)
|
|
{
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protossl_bufferevent_setup_child: ENTER, fd=%d\n", fd);
|
|
#endif /* DEBUG_PROXY */
|
|
|
|
struct bufferevent *bev = bufferevent_openssl_socket_new(ctx->conn->evbase, fd, ssl,
|
|
((fd == -1) ? BUFFEREVENT_SSL_CONNECTING : BUFFEREVENT_SSL_ACCEPTING), BEV_OPT_DEFER_CALLBACKS);
|
|
if (!bev) {
|
|
log_err_level_printf(LOG_CRIT, "Error creating bufferevent socket\n");
|
|
return NULL;
|
|
}
|
|
|
|
#if LIBEVENT_VERSION_NUMBER >= 0x02010000
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protossl_bufferevent_setup_child: bufferevent_openssl_set_allow_dirty_shutdown\n");
|
|
#endif /* DEBUG_PROXY */
|
|
|
|
/* Prevent unclean (dirty) shutdowns to cause error
|
|
* events on the SSL socket bufferevent. */
|
|
bufferevent_openssl_set_allow_dirty_shutdown(bev, 1);
|
|
#endif /* LIBEVENT_VERSION_NUMBER >= 0x02010000 */
|
|
|
|
bufferevent_setcb(bev, pxy_bev_readcb_child, pxy_bev_writecb_child, pxy_bev_eventcb_child, ctx);
|
|
|
|
// @attention We cannot enable events here, because src events will be deferred until after dst is connected
|
|
//bufferevent_enable(bev, EV_READ|EV_WRITE);
|
|
return bev;
|
|
}
|
|
|
|
/*
|
|
* Free bufferenvent and close underlying socket properly.
|
|
* For OpenSSL bufferevents, this will shutdown the SSL connection.
|
|
*/
|
|
static void
|
|
protossl_bufferevent_free_and_close_fd(struct bufferevent *bev, pxy_conn_ctx_t *ctx)
|
|
{
|
|
evutil_socket_t fd = bufferevent_getfd(bev);
|
|
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINER, "protossl_bufferevent_free_and_close_fd: in=%zu, out=%zu, fd=%d\n",
|
|
evbuffer_get_length(bufferevent_get_input(bev)), evbuffer_get_length(bufferevent_get_output(bev)), fd);
|
|
#endif /* DEBUG_PROXY */
|
|
|
|
SSL *ssl = bufferevent_openssl_get_ssl(bev); /* does not inc refc */
|
|
|
|
// @todo Do we need to NULL all cbs?
|
|
// @see https://stackoverflow.com/questions/31688709/knowing-all-callbacks-have-run-with-libevent-and-bufferevent-free
|
|
//bufferevent_setcb(bev, NULL, NULL, NULL, NULL);
|
|
bufferevent_free(bev); /* does not free SSL unless the option BEV_OPT_CLOSE_ON_FREE was set */
|
|
pxy_ssl_shutdown(ctx->opts, ctx->evbase, ssl, fd);
|
|
}
|
|
|
|
void
|
|
protossl_free(pxy_conn_ctx_t *ctx)
|
|
{
|
|
if (ctx->sslctx->ssl_names) {
|
|
free(ctx->sslctx->ssl_names);
|
|
}
|
|
if (ctx->sslctx->origcrtfpr) {
|
|
free(ctx->sslctx->origcrtfpr);
|
|
}
|
|
if (ctx->sslctx->usedcrtfpr) {
|
|
free(ctx->sslctx->usedcrtfpr);
|
|
}
|
|
if (ctx->sslctx->origcrt) {
|
|
X509_free(ctx->sslctx->origcrt);
|
|
}
|
|
if (ctx->sslctx->sni) {
|
|
free(ctx->sslctx->sni);
|
|
}
|
|
if (ctx->sslctx->srvdst_ssl_version) {
|
|
free(ctx->sslctx->srvdst_ssl_version);
|
|
}
|
|
if (ctx->sslctx->srvdst_ssl_cipher) {
|
|
free(ctx->sslctx->srvdst_ssl_cipher);
|
|
}
|
|
free(ctx->sslctx);
|
|
}
|
|
|
|
#ifndef OPENSSL_NO_TLSEXT
|
|
/*
|
|
* The SNI hostname has been resolved. Fill the first resolved address into
|
|
* the context and continue connecting.
|
|
*/
|
|
static void
|
|
protossl_sni_resolve_cb(int errcode, struct evutil_addrinfo *ai, void *arg)
|
|
{
|
|
pxy_conn_ctx_t *ctx = arg;
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protossl_sni_resolve_cb: ENTER, fd=%d\n", ctx->fd);
|
|
#endif /* DEBUG_PROXY */
|
|
|
|
if (errcode) {
|
|
log_err_printf("Cannot resolve SNI hostname '%s': %s\n", ctx->sslctx->sni, evutil_gai_strerror(errcode));
|
|
evutil_closesocket(ctx->fd);
|
|
pxy_conn_ctx_free(ctx, 1);
|
|
return;
|
|
}
|
|
|
|
memcpy(&ctx->dstaddr, ai->ai_addr, ai->ai_addrlen);
|
|
ctx->dstaddrlen = ai->ai_addrlen;
|
|
evutil_freeaddrinfo(ai);
|
|
pxy_conn_connect(ctx);
|
|
}
|
|
#endif /* !OPENSSL_NO_TLSEXT */
|
|
|
|
#ifndef OPENSSL_NO_TLSEXT
|
|
#define MAYBE_UNUSED
|
|
#else /* OPENSSL_NO_TLSEXT */
|
|
#define MAYBE_UNUSED UNUSED
|
|
#endif /* OPENSSL_NO_TLSEXT */
|
|
void
|
|
protossl_fd_readcb(MAYBE_UNUSED evutil_socket_t fd, UNUSED short what, void *arg)
|
|
{
|
|
pxy_conn_ctx_t *ctx = arg;
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protossl_fd_readcb: ENTER, fd=%d\n", ctx->fd);
|
|
#endif /* DEBUG_PROXY */
|
|
|
|
#ifndef OPENSSL_NO_TLSEXT
|
|
// Child connections will use the sni info obtained by the parent conn
|
|
/* for SSL, peek ClientHello and parse SNI from it */
|
|
|
|
unsigned char buf[1024];
|
|
ssize_t n;
|
|
const unsigned char *chello;
|
|
int rv;
|
|
|
|
n = recv(fd, buf, sizeof(buf), MSG_PEEK);
|
|
if (n == -1) {
|
|
log_err_printf("Error peeking on fd, aborting connection\n");
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINE, "ERROR: Error peeking on fd, aborting connection, fd=%d\n", ctx->fd);
|
|
#endif /* DEBUG_PROXY */
|
|
evutil_closesocket(fd);
|
|
pxy_conn_ctx_free(ctx, 1);
|
|
return;
|
|
}
|
|
if (n == 0) {
|
|
/* socket got closed while we were waiting */
|
|
log_err_printf("Socket got closed while waiting\n");
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINE, "ERROR: Socket got closed while waiting, fd=%d\n", ctx->fd);
|
|
#endif /* DEBUG_PROXY */
|
|
evutil_closesocket(fd);
|
|
pxy_conn_ctx_free(ctx, 1);
|
|
return;
|
|
}
|
|
|
|
rv = ssl_tls_clienthello_parse(buf, n, 0, &chello, &ctx->sslctx->sni);
|
|
if ((rv == 1) && !chello) {
|
|
log_err_printf("Peeking did not yield a (truncated) ClientHello message, aborting connection\n");
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINE, "ERROR: Peeking did not yield a (truncated) ClientHello message, aborting connection, fd=%d\n", ctx->fd);
|
|
#endif /* DEBUG_PROXY */
|
|
evutil_closesocket(fd);
|
|
pxy_conn_ctx_free(ctx, 1);
|
|
return;
|
|
}
|
|
if (OPTS_DEBUG(ctx->opts)) {
|
|
log_dbg_printf("SNI peek: [%s] [%s], fd=%d\n", ctx->sslctx->sni ? ctx->sslctx->sni : "n/a",
|
|
((rv == 1) && chello) ? "incomplete" : "complete", ctx->fd);
|
|
}
|
|
if ((rv == 1) && chello && (ctx->sslctx->sni_peek_retries++ < 50)) {
|
|
/* ssl_tls_clienthello_parse indicates that we
|
|
* should retry later when we have more data, and we
|
|
* haven't reached the maximum retry count yet.
|
|
* Reschedule this event as timeout-only event in
|
|
* order to prevent busy looping over the read event.
|
|
* Because we only peeked at the pending bytes and
|
|
* never actually read them, fd is still ready for
|
|
* reading now. We use 25 * 0.2 s = 5 s timeout. */
|
|
struct timeval retry_delay = {0, 100};
|
|
|
|
event_free(ctx->ev);
|
|
ctx->ev = event_new(ctx->evbase, fd, 0, ctx->protoctx->fd_readcb, ctx);
|
|
if (!ctx->ev) {
|
|
log_err_level_printf(LOG_CRIT, "Error creating retry event, aborting connection\n");
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINE, "ERROR: Error creating retry event, aborting connection, fd=%d\n", ctx->fd);
|
|
#endif /* DEBUG_PROXY */
|
|
evutil_closesocket(fd);
|
|
pxy_conn_ctx_free(ctx, 1);
|
|
return;
|
|
}
|
|
event_add(ctx->ev, &retry_delay);
|
|
return;
|
|
}
|
|
event_free(ctx->ev);
|
|
ctx->ev = NULL;
|
|
|
|
if (ctx->sslctx->sni && !ctx->dstaddrlen && ctx->spec->sni_port) {
|
|
char sniport[6];
|
|
struct evutil_addrinfo hints;
|
|
|
|
memset(&hints, 0, sizeof(hints));
|
|
hints.ai_family = ctx->af;
|
|
hints.ai_flags = EVUTIL_AI_ADDRCONFIG;
|
|
hints.ai_socktype = SOCK_STREAM;
|
|
hints.ai_protocol = IPPROTO_TCP;
|
|
|
|
snprintf(sniport, sizeof(sniport), "%i", ctx->spec->sni_port);
|
|
evdns_getaddrinfo(ctx->dnsbase, ctx->sslctx->sni, sniport, &hints, protossl_sni_resolve_cb, ctx);
|
|
return;
|
|
}
|
|
#endif /* !OPENSSL_NO_TLSEXT */
|
|
|
|
pxy_conn_connect(ctx);
|
|
}
|
|
|
|
int
|
|
protossl_setup_srvdst_ssl(pxy_conn_ctx_t *ctx)
|
|
{
|
|
ctx->srvdst.ssl = protossl_dstssl_create(ctx);
|
|
if (!ctx->srvdst.ssl) {
|
|
log_err_level_printf(LOG_CRIT, "Error creating SSL for srvdst\n");
|
|
pxy_conn_term(ctx, 1);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int NONNULL(1)
|
|
protossl_setup_srvdst(pxy_conn_ctx_t *ctx)
|
|
{
|
|
if (protossl_setup_srvdst_ssl(ctx) == -1) {
|
|
return -1;
|
|
}
|
|
|
|
ctx->srvdst.bev = protossl_bufferevent_setup(ctx, -1, ctx->srvdst.ssl);
|
|
if (!ctx->srvdst.bev) {
|
|
log_err_level_printf(LOG_CRIT, "Error creating srvdst\n");
|
|
SSL_free(ctx->srvdst.ssl);
|
|
ctx->srvdst.ssl = NULL;
|
|
pxy_conn_term(ctx, 1);
|
|
return -1;
|
|
}
|
|
ctx->srvdst.free = protossl_bufferevent_free_and_close_fd;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
protossl_setup_srvdst_new_bev_ssl_connecting(pxy_conn_ctx_t *ctx)
|
|
{
|
|
ctx->srvdst.bev = bufferevent_openssl_filter_new(ctx->evbase, ctx->srvdst.bev, ctx->srvdst.ssl,
|
|
BUFFEREVENT_SSL_CONNECTING, BEV_OPT_DEFER_CALLBACKS);
|
|
if (!ctx->srvdst.bev) {
|
|
log_err_level_printf(LOG_CRIT, "Error creating srvdst bufferevent\n");
|
|
SSL_free(ctx->srvdst.ssl);
|
|
ctx->srvdst.ssl = NULL;
|
|
pxy_conn_term(ctx, 1);
|
|
return -1;
|
|
}
|
|
ctx->srvdst.free = protossl_bufferevent_free_and_close_fd;
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
protossl_conn_connect(pxy_conn_ctx_t *ctx)
|
|
{
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protossl_conn_connect: ENTER, fd=%d\n", ctx->fd);
|
|
#endif /* DEBUG_PROXY */
|
|
|
|
if (prototcp_setup_dst(ctx) == -1) {
|
|
return;
|
|
}
|
|
|
|
bufferevent_setcb(ctx->dst.bev, pxy_bev_readcb, pxy_bev_writecb, pxy_bev_eventcb, ctx);
|
|
bufferevent_enable(ctx->dst.bev, EV_READ|EV_WRITE);
|
|
|
|
/* create server-side socket and eventbuffer */
|
|
if (protossl_setup_srvdst(ctx) == -1) {
|
|
return;
|
|
}
|
|
|
|
// @attention Sometimes dst write cb fires but not event cb, especially if this listener cb is not finished yet, so the conn stalls.
|
|
// @todo Why does event cb not fire sometimes?
|
|
// @attention BEV_OPT_DEFER_CALLBACKS seems responsible for the issue with srvdst, libevent acts as if we call event connect() ourselves.
|
|
// @see Launching connections on socket-based bufferevents at http://www.wangafu.net/~nickm/libevent-book/Ref6_bufferevent.html
|
|
// Disable and NULL r cb, we do nothing for srvdst in r cb
|
|
bufferevent_setcb(ctx->srvdst.bev, NULL, pxy_bev_writecb, pxy_bev_eventcb, ctx);
|
|
bufferevent_enable(ctx->srvdst.bev, EV_WRITE);
|
|
|
|
/* initiate connection */
|
|
if (bufferevent_socket_connect(ctx->srvdst.bev, (struct sockaddr *)&ctx->dstaddr, ctx->dstaddrlen) == -1) {
|
|
log_err_level_printf(LOG_CRIT, "protossl_conn_connect: bufferevent_socket_connect for srvdst failed\n");
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINE, "protossl_conn_connect: bufferevent_socket_connect for srvdst failed, fd=%d\n", ctx->fd);
|
|
#endif /* DEBUG_PROXY */
|
|
|
|
// @attention Do not try to close the conn here, otherwise both pxy_conn_connect() and eventcb try to free the conn using pxy_conn_free(),
|
|
// they are running on different threads, causing multithreading issues, e.g. signal 10.
|
|
// @todo Should we use thrmgr->mutex? Can we?
|
|
}
|
|
}
|
|
|
|
int
|
|
protossl_setup_dst_ssl_child(pxy_conn_child_ctx_t *ctx)
|
|
{
|
|
// Children rely on the findings of parent
|
|
ctx->dst.ssl = protossl_dstssl_create(ctx->conn);
|
|
if (!ctx->dst.ssl) {
|
|
log_err_level_printf(LOG_CRIT, "Error creating SSL\n");
|
|
// pxy_conn_free()>pxy_conn_free_child() will close the fd, since we have a non-NULL src.bev now
|
|
pxy_conn_term(ctx->conn, 1);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
protossl_setup_dst_child(pxy_conn_child_ctx_t *ctx)
|
|
{
|
|
if (protossl_setup_dst_ssl_child(ctx) == -1) {
|
|
return -1;
|
|
}
|
|
|
|
ctx->dst.bev = protossl_bufferevent_setup_child(ctx, -1, ctx->dst.ssl);
|
|
if (!ctx->dst.bev) {
|
|
log_err_level_printf(LOG_CRIT, "Error creating dst bufferevent\n");
|
|
SSL_free(ctx->dst.ssl);
|
|
ctx->dst.ssl = NULL;
|
|
pxy_conn_term(ctx->conn, 1);
|
|
return -1;
|
|
}
|
|
ctx->dst.free = protossl_bufferevent_free_and_close_fd;
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
protossl_connect_child(pxy_conn_child_ctx_t *ctx)
|
|
{
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protossl_connect_child: ENTER, child fd=%d, fd=%d\n", ctx->fd, ctx->conn->fd);
|
|
#endif /* DEBUG_PROXY */
|
|
|
|
/* create server-side socket and eventbuffer */
|
|
protossl_setup_dst_child(ctx);
|
|
}
|
|
|
|
int
|
|
protossl_setup_src_ssl(pxy_conn_ctx_t *ctx)
|
|
{
|
|
// @todo Make srvdst.ssl the origssl param
|
|
ctx->src.ssl = protossl_srcssl_create(ctx, ctx->srvdst.ssl);
|
|
if (!ctx->src.ssl) {
|
|
if (ctx->opts->passthrough && !ctx->enomem) {
|
|
log_err_level_printf(LOG_WARNING, "No cert found; falling back to passthrough\n");
|
|
protopassthrough_engage(ctx);
|
|
// report protocol change by returning 1
|
|
return 1;
|
|
}
|
|
pxy_conn_term(ctx, 1);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int NONNULL(1)
|
|
protossl_setup_src(pxy_conn_ctx_t *ctx)
|
|
{
|
|
int rv;
|
|
if ((rv = protossl_setup_src_ssl(ctx)) != 0) {
|
|
return rv;
|
|
}
|
|
|
|
ctx->src.bev = protossl_bufferevent_setup(ctx, ctx->fd, ctx->src.ssl);
|
|
if (!ctx->src.bev) {
|
|
log_err_level_printf(LOG_CRIT, "Error creating src bufferevent\n");
|
|
SSL_free(ctx->src.ssl);
|
|
ctx->src.ssl = NULL;
|
|
pxy_conn_term(ctx, 1);
|
|
return -1;
|
|
}
|
|
ctx->src.free = protossl_bufferevent_free_and_close_fd;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
protossl_setup_src_new_bev_ssl_accepting(pxy_conn_ctx_t *ctx)
|
|
{
|
|
ctx->src.bev = bufferevent_openssl_filter_new(ctx->evbase, ctx->src.bev, ctx->src.ssl,
|
|
BUFFEREVENT_SSL_ACCEPTING, BEV_OPT_DEFER_CALLBACKS);
|
|
if (!ctx->src.bev) {
|
|
log_err_level_printf(LOG_CRIT, "Error creating src bufferevent\n");
|
|
SSL_free(ctx->src.ssl);
|
|
ctx->src.ssl = NULL;
|
|
pxy_conn_term(ctx, 1);
|
|
return -1;
|
|
}
|
|
ctx->src.free = protossl_bufferevent_free_and_close_fd;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
protossl_setup_dst_new_bev_ssl_connecting_child(pxy_conn_child_ctx_t *ctx)
|
|
{
|
|
ctx->dst.bev = bufferevent_openssl_filter_new(ctx->conn->evbase, ctx->dst.bev, ctx->dst.ssl,
|
|
BUFFEREVENT_SSL_CONNECTING, BEV_OPT_DEFER_CALLBACKS);
|
|
if (!ctx->dst.bev) {
|
|
log_err_level_printf(LOG_CRIT, "Error creating dst bufferevent\n");
|
|
SSL_free(ctx->dst.ssl);
|
|
ctx->dst.ssl = NULL;
|
|
pxy_conn_term(ctx->conn, 1);
|
|
return -1;
|
|
}
|
|
ctx->dst.free = protossl_bufferevent_free_and_close_fd;
|
|
return 0;
|
|
}
|
|
|
|
static void NONNULL(1)
|
|
protossl_close_srvdst(pxy_conn_ctx_t *ctx)
|
|
{
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINER, "protossl_close_srvdst: Closing srvdst, fd=%d, srvdst fd=%d\n", ctx->fd, bufferevent_getfd(ctx->srvdst.bev));
|
|
#endif /* DEBUG_PROXY */
|
|
|
|
// @attention Free the srvdst of the conn asap, we don't need it anymore, but we need its fd
|
|
// So save its ssl info for logging
|
|
ctx->sslctx->srvdst_ssl_version = strdup(SSL_get_version(ctx->srvdst.ssl));
|
|
ctx->sslctx->srvdst_ssl_cipher = strdup(SSL_get_cipher(ctx->srvdst.ssl));
|
|
|
|
// @attention When both eventcb and writecb for srvdst are enabled, either eventcb or writecb may get a NULL srvdst bev, causing a crash with signal 10.
|
|
// So, from this point on, we should check if srvdst is NULL or not.
|
|
ctx->srvdst.free(ctx->srvdst.bev, ctx);
|
|
ctx->srvdst.bev = NULL;
|
|
ctx->srvdst.closed = 1;
|
|
}
|
|
|
|
static int NONNULL(1)
|
|
protossl_enable_src(pxy_conn_ctx_t *ctx)
|
|
{
|
|
int rv;
|
|
if ((rv = protossl_setup_src(ctx)) != 0) {
|
|
// Might have switched to passthrough mode
|
|
return rv;
|
|
}
|
|
bufferevent_setcb(ctx->src.bev, pxy_bev_readcb, pxy_bev_writecb, pxy_bev_eventcb, ctx);
|
|
|
|
protossl_close_srvdst(ctx);
|
|
|
|
if (pxy_setup_child_listener(ctx) == -1) {
|
|
return -1;
|
|
}
|
|
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINER, "protossl_enable_src: Enabling src, %s, fd=%d, child_fd=%d\n", ctx->sslproxy_header, ctx->fd, ctx->child_fd);
|
|
#endif /* DEBUG_PROXY */
|
|
|
|
// Now open the gates
|
|
bufferevent_enable(ctx->src.bev, EV_READ|EV_WRITE);
|
|
return 0;
|
|
}
|
|
|
|
static void NONNULL(1,2)
|
|
protossl_bev_eventcb_connected_dst(UNUSED struct bufferevent *bev, pxy_conn_ctx_t *ctx)
|
|
{
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protossl_bev_eventcb_connected_dst: ENTER, fd=%d\n", ctx->fd);
|
|
#endif /* DEBUG_PROXY */
|
|
|
|
ctx->dst_connected = 1;
|
|
|
|
if (ctx->srvdst_connected && ctx->dst_connected && !ctx->connected) {
|
|
ctx->connected = 1;
|
|
|
|
if (protossl_enable_src(ctx) == -1) {
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void NONNULL(1,2)
|
|
protossl_bev_eventcb_connected_srvdst(UNUSED struct bufferevent *bev, pxy_conn_ctx_t *ctx)
|
|
{
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protossl_bev_eventcb_connected_srvdst: ENTER, fd=%d\n", ctx->fd);
|
|
#endif /* DEBUG_PROXY */
|
|
|
|
ctx->srvdst_connected = 1;
|
|
|
|
// @attention Create and enable dst.bev before, but connect here, because we check if dst.bev is NULL elsewhere
|
|
if (bufferevent_socket_connect(ctx->dst.bev, (struct sockaddr *)&ctx->spec->conn_dst_addr, ctx->spec->conn_dst_addrlen) == -1) {
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINE, "protossl_bev_eventcb_connected_srvdst: FAILED bufferevent_socket_connect for dst, fd=%d\n", ctx->fd);
|
|
#endif /* DEBUG_PROXY */
|
|
|
|
pxy_conn_term(ctx, 1);
|
|
return;
|
|
}
|
|
|
|
if (ctx->srvdst_connected && ctx->dst_connected && !ctx->connected) {
|
|
ctx->connected = 1;
|
|
|
|
if (protossl_enable_src(ctx) == -1) {
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void NONNULL(1,2)
|
|
protossl_bev_eventcb_error_srvdst(struct bufferevent *bev, pxy_conn_ctx_t *ctx)
|
|
{
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINE, "protossl_bev_eventcb_error_srvdst: BEV_EVENT_ERROR, fd=%d\n", ctx->fd);
|
|
#endif /* DEBUG_PROXY */
|
|
|
|
if (!ctx->connected) {
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINE, "protossl_bev_eventcb_error_srvdst: ERROR !ctx->connected, fd=%d\n", ctx->fd);
|
|
#endif /* DEBUG_PROXY */
|
|
|
|
/* the callout to the original destination failed,
|
|
* e.g. because it asked for client cert auth, so
|
|
* close the accepted socket and clean up */
|
|
if (ctx->opts->passthrough && bufferevent_get_openssl_error(bev)) {
|
|
/* ssl callout failed, fall back to plain TCP passthrough of SSL connection */
|
|
log_err_level_printf(LOG_WARNING, "SSL srvdst connection failed; falling back to passthrough\n");
|
|
protopassthrough_engage(ctx);
|
|
return;
|
|
}
|
|
pxy_conn_term(ctx, 0);
|
|
}
|
|
}
|
|
|
|
static void NONNULL(1)
|
|
protossl_bev_eventcb_dst(struct bufferevent *bev, short events, pxy_conn_ctx_t *ctx)
|
|
{
|
|
if (events & BEV_EVENT_CONNECTED) {
|
|
protossl_bev_eventcb_connected_dst(bev, ctx);
|
|
} else if (events & BEV_EVENT_EOF) {
|
|
prototcp_bev_eventcb_eof_dst(bev, ctx);
|
|
} else if (events & BEV_EVENT_ERROR) {
|
|
prototcp_bev_eventcb_error_dst(bev, ctx);
|
|
}
|
|
}
|
|
|
|
static void NONNULL(1)
|
|
protossl_bev_eventcb_srvdst(struct bufferevent *bev, short events, pxy_conn_ctx_t *ctx)
|
|
{
|
|
if (events & BEV_EVENT_CONNECTED) {
|
|
protossl_bev_eventcb_connected_srvdst(bev, ctx);
|
|
} else if (events & BEV_EVENT_EOF) {
|
|
prototcp_bev_eventcb_eof_srvdst(bev, ctx);
|
|
} else if (events & BEV_EVENT_ERROR) {
|
|
protossl_bev_eventcb_error_srvdst(bev, ctx);
|
|
}
|
|
}
|
|
|
|
void
|
|
protossl_bev_eventcb(struct bufferevent *bev, short events, void *arg)
|
|
{
|
|
pxy_conn_ctx_t *ctx = arg;
|
|
|
|
if (events & BEV_EVENT_ERROR) {
|
|
protossl_log_ssl_error(bev, ctx);
|
|
}
|
|
|
|
if (bev == ctx->src.bev) {
|
|
prototcp_bev_eventcb_src(bev, events, ctx);
|
|
} else if (bev == ctx->dst.bev) {
|
|
protossl_bev_eventcb_dst(bev, events, ctx);
|
|
} else if (bev == ctx->srvdst.bev) {
|
|
protossl_bev_eventcb_srvdst(bev, events, ctx);
|
|
} else {
|
|
log_err_printf("protossl_bev_eventcb: UNKWN conn end\n");
|
|
}
|
|
}
|
|
|
|
void
|
|
protossl_bev_eventcb_child(struct bufferevent *bev, short events, void *arg)
|
|
{
|
|
pxy_conn_child_ctx_t *ctx = arg;
|
|
|
|
if (events & BEV_EVENT_ERROR) {
|
|
protossl_log_ssl_error(bev, ctx->conn);
|
|
}
|
|
|
|
if (bev == ctx->src.bev) {
|
|
prototcp_bev_eventcb_src_child(bev, events, ctx);
|
|
} else if (bev == ctx->dst.bev) {
|
|
prototcp_bev_eventcb_dst_child(bev, events, ctx);
|
|
} else {
|
|
log_err_printf("protossl_bev_eventcb_child: UNKWN conn end\n");
|
|
}
|
|
}
|
|
|
|
protocol_t
|
|
protossl_setup(pxy_conn_ctx_t *ctx)
|
|
{
|
|
ctx->protoctx->proto = PROTO_SSL;
|
|
ctx->protoctx->connectcb = protossl_conn_connect;
|
|
ctx->protoctx->fd_readcb = protossl_fd_readcb;
|
|
|
|
ctx->protoctx->bev_eventcb = protossl_bev_eventcb;
|
|
|
|
ctx->protoctx->proto_free = protossl_free;
|
|
|
|
ctx->sslctx = malloc(sizeof(ssl_ctx_t));
|
|
if (!ctx->sslctx) {
|
|
free(ctx->protoctx->arg);
|
|
free(ctx->protoctx);
|
|
return PROTO_ERROR;
|
|
}
|
|
memset(ctx->sslctx, 0, sizeof(ssl_ctx_t));
|
|
|
|
return PROTO_SSL;
|
|
}
|
|
|
|
protocol_t
|
|
protossl_setup_child(pxy_conn_child_ctx_t *ctx)
|
|
{
|
|
ctx->protoctx->proto = PROTO_SSL;
|
|
ctx->protoctx->connectcb = protossl_connect_child;
|
|
|
|
ctx->protoctx->bev_eventcb = protossl_bev_eventcb_child;
|
|
|
|
return PROTO_SSL;
|
|
}
|
|
|
|
/* vim: set noet ft=c: */
|