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555 lines
17 KiB
C
555 lines
17 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) 2017-2019, 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 "prototcp.h"
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#include "sys.h"
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#include <sys/param.h>
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#include <string.h>
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/*
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* Set up a bufferevent structure for either a dst or src connection,
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* optionally with or without SSL. Sets all callbacks, enables read
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* and write events, but does not call bufferevent_socket_connect().
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*
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* For dst connections, pass -1 as fd. Pass a pointer to an initialized
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* SSL struct as ssl if the connection should use SSL.
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*
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* Returns pointer to initialized bufferevent structure, as returned
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* by bufferevent_socket_new() or bufferevent_openssl_socket_new().
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*/
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static struct bufferevent * NONNULL(1)
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prototcp_bufferevent_setup(pxy_conn_ctx_t *ctx, evutil_socket_t fd)
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{
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "prototcp_bufferevent_setup: ENTER, fd=%d\n", fd);
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#endif /* DEBUG_PROXY */
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// @todo Do we really need to defer callbacks? BEV_OPT_DEFER_CALLBACKS seems responsible for the issue with dst: We get writecb sometimes, no eventcb for CONNECTED event
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struct bufferevent *bev = bufferevent_socket_new(ctx->evbase, fd, BEV_OPT_DEFER_CALLBACKS|BEV_OPT_THREADSAFE);
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if (!bev) {
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log_err_level_printf(LOG_CRIT, "Error creating bufferevent socket\n");
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINE, "prototcp_bufferevent_setup: bufferevent_socket_connect failed, fd=%d\n", fd);
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#endif /* DEBUG_PROXY */
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return NULL;
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}
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return bev;
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}
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/*
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* Free bufferenvent and close underlying socket properly.
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*/
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static void
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prototcp_bufferevent_free_and_close_fd(struct bufferevent *bev, UNUSED pxy_conn_ctx_t *ctx)
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{
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evutil_socket_t fd = bufferevent_getfd(bev);
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINER, "prototcp_bufferevent_free_and_close_fd: in=%zu, out=%zu, fd=%d\n",
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evbuffer_get_length(bufferevent_get_input(bev)), evbuffer_get_length(bufferevent_get_output(bev)), fd);
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#endif /* DEBUG_PROXY */
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bufferevent_free(bev);
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evutil_closesocket(fd);
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}
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static int NONNULL(1)
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prototcp_setup_src(pxy_conn_ctx_t *ctx)
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{
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ctx->src.bev = prototcp_bufferevent_setup(ctx, ctx->fd);
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if (!ctx->src.bev) {
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log_err_level_printf(LOG_CRIT, "Error creating src bufferevent\n");
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pxy_conn_term(ctx, 1);
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return -1;
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}
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ctx->src.free = prototcp_bufferevent_free_and_close_fd;
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return 0;
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}
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static int NONNULL(1)
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prototcp_setup_dst(pxy_conn_ctx_t *ctx)
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{
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ctx->dst.bev = prototcp_bufferevent_setup(ctx, -1);
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if (!ctx->dst.bev) {
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log_err_level_printf(LOG_CRIT, "Error creating parent dst\n");
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pxy_conn_term(ctx, 1);
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return -1;
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}
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ctx->dst.free = prototcp_bufferevent_free_and_close_fd;
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return 0;
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}
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static int NONNULL(1) WUNRES
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prototcp_conn_connect(pxy_conn_ctx_t *ctx)
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{
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "prototcp_conn_connect: ENTER, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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if (prototcp_setup_src(ctx) == -1) {
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return -1;
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}
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if (prototcp_setup_dst(ctx) == -1) {
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return -1;
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}
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// Conn setup is successful, so add the conn to the conn list of its thread now
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pxy_thrmgr_add_conn(ctx);
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bufferevent_setcb(ctx->src.bev, pxy_bev_readcb, pxy_bev_writecb, pxy_bev_eventcb, ctx);
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bufferevent_setcb(ctx->dst.bev, pxy_bev_readcb, pxy_bev_writecb, pxy_bev_eventcb, ctx);
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINER, "prototcp_conn_connect: Enabling src, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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// Now open the gates
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bufferevent_enable(ctx->src.bev, EV_READ|EV_WRITE);
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return 0;
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}
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static void
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prototcp_fd_readcb(UNUSED evutil_socket_t fd, UNUSED short what, void *arg)
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{
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pxy_conn_ctx_t *ctx = arg;
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "prototcp_fd_readcb: ENTER, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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pxy_conn_connect(ctx);
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}
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static int
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prototcp_parse_sslproxy_line(char *line, pxy_conn_ctx_t *ctx)
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{
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#define MAX_IPADDR_LEN 45
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#define MAX_PORT_LEN 5
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// SSLproxy: [127.0.0.1]:34649,[192.168.3.24]:47286,[74.125.206.108]:465,s,soner
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if (!strncasecmp(line, "SSLproxy:", 9)) {
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if (OPTS_DEBUG(ctx->opts)) {
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log_dbg_printf("%s\n", line);
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}
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char *ip_start = strchr(line, '[') + 1;
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char *ip_end = strchr(ip_start, ']');
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char *port_start = strchr(ip_end, ':') + 1;
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char *port_end = strchr(port_start, ',');
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if (!ip_start || !ip_end || !port_start || !port_end) {
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log_err_level_printf(LOG_ERR, "Unable to find sslproxy addr: %s", line);
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return -1;
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}
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int addr_len = ip_end - ip_start;
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if (addr_len > MAX_IPADDR_LEN) {
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log_err_level_printf(LOG_ERR, "sslproxy addr_len larger than MAX_IPADDR_LEN: %d\n", addr_len);
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return -1;
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}
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char addr[MAX_IPADDR_LEN + 1];
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strncpy(addr, ip_start, addr_len);
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addr[addr_len] = '\0';
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int port_len = port_end - port_start;
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if (port_len > MAX_PORT_LEN) {
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log_err_level_printf(LOG_ERR, "sslproxy port_len larger than MAX_PORT_LEN: %d\n", port_len);
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return -1;
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}
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char port[MAX_PORT_LEN + 1];
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strncpy(port, port_start, port_len);
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port[port_len] = '\0';
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if (sys_sockaddr_parse(&ctx->dstaddr,
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&ctx->dstaddrlen,
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addr, port,
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sys_get_af(addr),
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EVUTIL_AI_PASSIVE) == -1) {
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log_err_level_printf(LOG_ERR, "Cannot convert sslproxy addr to sockaddr: [%s]:%s\n", addr, port);
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return -1;
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}
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if (OPTS_DEBUG(ctx->opts)) {
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log_dbg_printf("Connecting to [%s]:%s\n", addr, port);
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ctx->dsthost_str = strdup(addr);
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ctx->dstport_str = strdup(port);
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if (!ctx->dsthost_str || !ctx->dstport_str) {
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log_err_level_printf(LOG_ERR, "Cannot dup addr or port: [%s]:%s\n", addr, port);
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return -1;
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}
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}
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ctx->seen_sslproxy_line = 1;
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}
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return 0;
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}
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static void NONNULL(1,2)
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prototcp_bev_readcb_src(struct bufferevent *bev, pxy_conn_ctx_t *ctx)
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{
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "prototcp_bev_readcb_src: ENTER, size=%zu, fd=%d\n",
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evbuffer_get_length(bufferevent_get_input(bev)), ctx->fd);
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#endif /* DEBUG_PROXY */
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struct evbuffer *inbuf = bufferevent_get_input(bev);
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struct evbuffer *outbuf = bufferevent_get_output(ctx->dst.bev);
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if (!ctx->seen_sslproxy_line) {
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char *line;
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while (!ctx->seen_sslproxy_line && (line = evbuffer_readln(inbuf, NULL, EVBUFFER_EOL_CRLF))) {
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "prototcp_bev_readcb_src: %s, fd=%d\n", line, ctx->fd);
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#endif /* DEBUG_PROXY */
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if (prototcp_parse_sslproxy_line(line, ctx) == -1) {
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free(line);
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pxy_conn_term(ctx, 1);
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return;
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}
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if (ctx->seen_sslproxy_line) {
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/* initiate connection */
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if (bufferevent_socket_connect(ctx->dst.bev, (struct sockaddr *)&ctx->dstaddr, ctx->dstaddrlen) == -1) {
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log_err_level_printf(LOG_CRIT, "prototcp_bev_readcb_src: bufferevent_socket_connect for dst failed\n");
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINE, "prototcp_bev_readcb_src: bufferevent_socket_connect for dst failed, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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}
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}
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evbuffer_add_printf(outbuf, "%s\r\n", line);
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free(line);
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}
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if (evbuffer_get_length(inbuf) == 0) {
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goto out;
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}
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} else {
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if (ctx->dst.closed) {
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pxy_discard_inbuf(bev);
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return;
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}
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}
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evbuffer_add_buffer(outbuf, inbuf);
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out:
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pxy_try_set_watermark(bev, ctx, ctx->dst.bev);
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}
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static void NONNULL(1)
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prototcp_bev_readcb_dst(struct bufferevent *bev, pxy_conn_ctx_t *ctx)
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{
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "prototcp_bev_readcb_dst: ENTER, size=%zu, fd=%d\n",
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evbuffer_get_length(bufferevent_get_input(bev)), ctx->fd);
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#endif /* DEBUG_PROXY */
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if (!ctx->dst_connected) {
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log_err_level_printf(LOG_CRIT, "prototcp_bev_readcb_dst: readcb called when not connected - aborting.\n");
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log_exceptcb();
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return;
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}
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if (ctx->src.closed) {
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pxy_discard_inbuf(bev);
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return;
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}
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struct evbuffer *inbuf = bufferevent_get_input(bev);
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struct evbuffer *outbuf = bufferevent_get_output(ctx->src.bev);
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evbuffer_add_buffer(outbuf, inbuf);
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pxy_try_set_watermark(bev, ctx, ctx->src.bev);
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}
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static int NONNULL(1,2)
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prototcp_connect_conn_end(struct bufferevent *bev, pxy_conn_ctx_t *ctx)
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{
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINE, "prototcp_connect_conn_end: writecb before connected, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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// @attention Sometimes write cb fires but not event cb, especially if the listener cb is not finished yet, so the conn stalls.
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// This is a workaround for this error condition, nothing else seems to work.
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// @attention Do not try to free the conn here, since the listener cb may not be finished yet, which causes multithreading issues
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// XXX: Workaround, should find the real cause: BEV_OPT_DEFER_CALLBACKS?
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ctx->protoctx->bev_eventcb(bev, BEV_EVENT_CONNECTED, ctx);
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return pxy_bev_eventcb_postexec_logging_and_stats(bev, BEV_EVENT_CONNECTED, ctx);
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}
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static void NONNULL(1)
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prototcp_bev_writecb_src(struct bufferevent *bev, pxy_conn_ctx_t *ctx)
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{
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "prototcp_bev_writecb_src: ENTER, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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if (!ctx->src_connected) {
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if (prototcp_connect_conn_end(bev, ctx) == -1) {
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return;
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}
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}
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if (ctx->dst.closed) {
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if (pxy_try_close_conn_end(&ctx->src, ctx) == 1) {
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "prototcp_bev_writecb_src: other->closed, terminate conn, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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pxy_conn_term(ctx, 1);
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}
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return;
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}
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pxy_try_unset_watermark(bev, ctx, &ctx->dst);
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}
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static void NONNULL(1)
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prototcp_bev_writecb_dst(struct bufferevent *bev, pxy_conn_ctx_t *ctx)
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{
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "prototcp_bev_writecb_dst: ENTER, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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if (!ctx->dst_connected) {
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if (prototcp_connect_conn_end(bev, ctx) == -1) {
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return;
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}
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}
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if (ctx->src.closed) {
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if (pxy_try_close_conn_end(&ctx->dst, ctx) == 1) {
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "prototcp_bev_writecb_dst: other->closed, terminate conn, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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pxy_conn_term(ctx, 0);
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}
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return;
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}
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pxy_try_unset_watermark(bev, ctx, &ctx->src);
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}
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static void NONNULL(1,2)
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prototcp_bev_eventcb_connected_src(UNUSED struct bufferevent *bev, UNUSED pxy_conn_ctx_t *ctx)
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{
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "prototcp_bev_eventcb_connected_src: ENTER, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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ctx->src_connected = 1;
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}
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static void NONNULL(1,2)
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prototcp_bev_eventcb_connected_dst(UNUSED struct bufferevent *bev, pxy_conn_ctx_t *ctx)
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{
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "prototcp_bev_eventcb_connected_dst: ENTER, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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ctx->dst_connected = 1;
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}
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static void NONNULL(1,2)
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prototcp_bev_eventcb_eof_src(struct bufferevent *bev, pxy_conn_ctx_t *ctx)
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{
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "prototcp_bev_eventcb_eof_src: ENTER, fd=%d\n", ctx->fd);
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pxy_log_dbg_evbuf_info(ctx, &ctx->src, &ctx->dst);
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#endif /* DEBUG_PROXY */
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if (!ctx->src_connected) {
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log_err_level_printf(LOG_WARNING, "EOF on connection before connection establishment\n");
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINE, "prototcp_bev_eventcb_eof_src: EOF on connection before connection establishment, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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ctx->dst.closed = 1;
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} else if (!ctx->dst.closed) {
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "prototcp_bev_eventcb_eof_src: !other->closed, terminate conn, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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if (pxy_try_consume_last_input(bev, ctx) == -1) {
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return;
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}
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pxy_try_close_conn_end(&ctx->dst, ctx);
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}
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pxy_try_disconnect(ctx, &ctx->src, &ctx->dst, 1);
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}
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static void NONNULL(1,2)
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prototcp_bev_eventcb_eof_dst(struct bufferevent *bev, pxy_conn_ctx_t *ctx)
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{
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "prototcp_bev_eventcb_eof_dst: ENTER, fd=%d\n", ctx->fd);
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pxy_log_dbg_evbuf_info(ctx, &ctx->dst, &ctx->src);
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#endif /* DEBUG_PROXY */
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if (!ctx->dst_connected) {
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log_err_level_printf(LOG_WARNING, "EOF on connection before connection establishment\n");
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINE, "prototcp_bev_eventcb_eof_dst: EOF on connection before connection establishment, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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ctx->src.closed = 1;
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} else if (!ctx->src.closed) {
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "prototcp_bev_eventcb_eof_dst: !other->closed, terminate conn, fd=%d\n", ctx->fd);
|
|
#endif /* DEBUG_PROXY */
|
|
|
|
if (pxy_try_consume_last_input(bev, ctx) == -1) {
|
|
return;
|
|
}
|
|
pxy_try_close_conn_end(&ctx->src, ctx);
|
|
}
|
|
|
|
pxy_try_disconnect(ctx, &ctx->dst, &ctx->src, 0);
|
|
}
|
|
|
|
static void NONNULL(1,2)
|
|
prototcp_bev_eventcb_error_src(UNUSED struct bufferevent *bev, pxy_conn_ctx_t *ctx)
|
|
{
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINE, "prototcp_bev_eventcb_error_src: BEV_EVENT_ERROR, fd=%d\n", ctx->fd);
|
|
#endif /* DEBUG_PROXY */
|
|
|
|
if (!ctx->src_connected) {
|
|
ctx->dst.closed = 1;
|
|
} else if (!ctx->dst.closed) {
|
|
pxy_try_close_conn_end(&ctx->dst, ctx);
|
|
}
|
|
|
|
pxy_try_disconnect(ctx, &ctx->src, &ctx->dst, 1);
|
|
}
|
|
|
|
static void NONNULL(1,2)
|
|
prototcp_bev_eventcb_error_dst(UNUSED struct bufferevent *bev, pxy_conn_ctx_t *ctx)
|
|
{
|
|
#ifdef DEBUG_PROXY
|
|
log_dbg_level_printf(LOG_DBG_MODE_FINE, "prototcp_bev_eventcb_error_dst: BEV_EVENT_ERROR, fd=%d\n", ctx->fd);
|
|
#endif /* DEBUG_PROXY */
|
|
|
|
if (!ctx->dst_connected) {
|
|
ctx->src.closed = 1;
|
|
} else if (!ctx->src.closed) {
|
|
pxy_try_close_conn_end(&ctx->src, ctx);
|
|
}
|
|
|
|
pxy_try_disconnect(ctx, &ctx->dst, &ctx->src, 0);
|
|
}
|
|
|
|
static void NONNULL(1,3)
|
|
prototcp_bev_eventcb_src(struct bufferevent *bev, short events, pxy_conn_ctx_t *ctx)
|
|
{
|
|
if (events & BEV_EVENT_CONNECTED) {
|
|
prototcp_bev_eventcb_connected_src(bev, ctx);
|
|
} else if (events & BEV_EVENT_EOF) {
|
|
prototcp_bev_eventcb_eof_src(bev, ctx);
|
|
} else if (events & BEV_EVENT_ERROR) {
|
|
prototcp_bev_eventcb_error_src(bev, ctx);
|
|
}
|
|
}
|
|
|
|
static void NONNULL(1)
|
|
prototcp_bev_eventcb_dst(struct bufferevent *bev, short events, pxy_conn_ctx_t *ctx)
|
|
{
|
|
if (events & BEV_EVENT_CONNECTED) {
|
|
prototcp_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)
|
|
prototcp_bev_readcb(struct bufferevent *bev, void *arg)
|
|
{
|
|
pxy_conn_ctx_t *ctx = arg;
|
|
|
|
if (bev == ctx->src.bev) {
|
|
prototcp_bev_readcb_src(bev, ctx);
|
|
} else if (bev == ctx->dst.bev) {
|
|
prototcp_bev_readcb_dst(bev, ctx);
|
|
} else {
|
|
log_err_printf("prototcp_bev_readcb: UNKWN conn end\n");
|
|
}
|
|
}
|
|
|
|
static void NONNULL(1)
|
|
prototcp_bev_writecb(struct bufferevent *bev, void *arg)
|
|
{
|
|
pxy_conn_ctx_t *ctx = arg;
|
|
|
|
if (bev == ctx->src.bev) {
|
|
prototcp_bev_writecb_src(bev, ctx);
|
|
} else if (bev == ctx->dst.bev) {
|
|
prototcp_bev_writecb_dst(bev, ctx);
|
|
} else {
|
|
log_err_printf("prototcp_bev_writecb: UNKWN conn end\n");
|
|
}
|
|
}
|
|
|
|
static void NONNULL(1)
|
|
prototcp_bev_eventcb(struct bufferevent *bev, short events, void *arg)
|
|
{
|
|
pxy_conn_ctx_t *ctx = arg;
|
|
|
|
if (bev == ctx->src.bev) {
|
|
prototcp_bev_eventcb_src(bev, events, ctx);
|
|
} else if (bev == ctx->dst.bev) {
|
|
prototcp_bev_eventcb_dst(bev, events, ctx);
|
|
} else {
|
|
log_err_printf("prototcp_bev_eventcb: UNKWN conn end\n");
|
|
}
|
|
}
|
|
|
|
protocol_t
|
|
prototcp_setup(pxy_conn_ctx_t *ctx)
|
|
{
|
|
ctx->protoctx->proto = PROTO_TCP;
|
|
ctx->protoctx->connectcb = prototcp_conn_connect;
|
|
ctx->protoctx->fd_readcb = prototcp_fd_readcb;
|
|
|
|
ctx->protoctx->bev_readcb = prototcp_bev_readcb;
|
|
ctx->protoctx->bev_writecb = prototcp_bev_writecb;
|
|
ctx->protoctx->bev_eventcb = prototcp_bev_eventcb;
|
|
|
|
return PROTO_TCP;
|
|
}
|
|
|
|
/* vim: set noet ft=c: */
|