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361 lines
13 KiB
C
361 lines
13 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) 2017-2024, 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 "pxythr.h"
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#include "log.h"
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#include "pxyconn.h"
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#include "util.h"
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#include <assert.h>
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/*
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* Attach a connection to its thread.
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* This function cannot fail.
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*/
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void
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pxy_thr_attach(pxy_conn_ctx_t *ctx)
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{
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assert(ctx != NULL);
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// A thr should have already been assigned
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assert(ctx->thr != NULL);
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log_finest("Adding conn");
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// Always keep thr load and conns list in sync
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ctx->thr->load++;
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ctx->next = ctx->thr->conns;
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ctx->thr->conns = ctx;
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if (ctx->next)
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ctx->next->prev = ctx;
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}
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/*
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* Detach a connection from a thread by index.
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* This function cannot fail.
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*/
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void
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pxy_thr_detach(pxy_conn_ctx_t *ctx)
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{
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assert(ctx != NULL);
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assert(ctx->children == NULL);
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// If this function is called, the thr conns list cannot be empty
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assert(ctx->thr->conns != NULL);
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log_finest("Removing conn");
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// We increment thr load in pxy_conn_init() only (for parent conns)
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ctx->thr->load--;
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if (ctx->prev) {
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ctx->prev->next = ctx->next;
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} else {
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ctx->thr->conns = ctx->next;
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}
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if (ctx->next)
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ctx->next->prev = ctx->prev;
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#ifdef DEBUG_PROXY
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// We may get multiple conns with the same fd combinations, so fds cannot uniquely identify a conn; hence the need for unique ids.
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if (ctx->thr->conns) {
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if (ctx->id == ctx->thr->conns->id) {
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// This should never happen
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log_fine("Found conn in thr conns, first");
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assert(0);
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} else {
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pxy_conn_ctx_t *current = ctx->thr->conns->next;
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pxy_conn_ctx_t *previous = ctx->thr->conns;
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while (current != NULL && previous != NULL) {
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if (ctx->id == current->id) {
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// This should never happen
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log_fine("Found conn in thr conns");
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assert(0);
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}
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previous = current;
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current = current->next;
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}
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log_finest("Cannot find conn in thr conns");
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}
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} else {
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log_finest("Cannot find conn in thr conns, empty");
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}
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#endif /* DEBUG_PROXY */
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}
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static void
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pxy_thr_get_expired_conns(pxy_thr_ctx_t *tctx, pxy_conn_ctx_t **expired_conns)
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{
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*expired_conns = NULL;
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if (tctx->conns) {
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time_t now = time(NULL);
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pxy_conn_ctx_t *ctx = tctx->conns;
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while (ctx) {
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time_t elapsed_time = now - ctx->atime;
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if (elapsed_time > (time_t)tctx->thrmgr->global->conn_idle_timeout) {
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ctx->next_expired = *expired_conns;
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*expired_conns = ctx;
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}
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ctx = ctx->next;
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}
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if (tctx->thrmgr->global->statslog) {
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ctx = *expired_conns;
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while (ctx) {
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time_t atime = now - ctx->atime;
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time_t ctime = now - ctx->ctime;
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#ifndef WITHOUT_USERAUTH
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log_finest_main_va("thr=%d, id=%llu, fd=%d, child_fd=%d, dst=%d, srvdst=%d, child_src=%d, child_dst=%d, p=%d-%d-%d c=%d-%d, ce=%d cc=%d, at=%lld ct=%lld, src_addr=%s:%s, dst_addr=%s:%s, user=%s, valid=%d",
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tctx->id, ctx->id, ctx->fd, ctx->child_fd, ctx->dst_fd, ctx->srvdst_fd, ctx->child_src_fd, ctx->child_dst_fd,
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ctx->src.closed, ctx->dst.closed, ctx->srvdst.closed, ctx->children ? ctx->children->src.closed : 0, ctx->children ? ctx->children->dst.closed : 0,
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ctx->children ? 1:0, ctx->child_count, (long long)atime, (long long)ctime,
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STRORDASH(ctx->srchost_str), STRORDASH(ctx->srcport_str), STRORDASH(ctx->dsthost_str), STRORDASH(ctx->dstport_str),
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STRORDASH(ctx->user), ctx->protoctx->is_valid);
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#else /* WITHOUT_USERAUTH */
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log_finest_main_va("thr=%d, id=%llu, fd=%d, child_fd=%d, dst=%d, srvdst=%d, child_src=%d, child_dst=%d, p=%d-%d-%d c=%d-%d, ce=%d cc=%d, at=%lld ct=%lld, src_addr=%s:%s, dst_addr=%s:%s, valid=%d",
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tctx->id, ctx->id, ctx->fd, ctx->child_fd, ctx->dst_fd, ctx->srvdst_fd, ctx->child_src_fd, ctx->child_dst_fd,
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ctx->src.closed, ctx->dst.closed, ctx->srvdst.closed, ctx->children ? ctx->children->src.closed : 0, ctx->children ? ctx->children->dst.closed : 0,
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ctx->children ? 1:0, ctx->child_count, (long long)atime, (long long)ctime,
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STRORDASH(ctx->srchost_str), STRORDASH(ctx->srcport_str), STRORDASH(ctx->dsthost_str), STRORDASH(ctx->dstport_str), ctx->protoctx->is_valid);
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#endif /* WITHOUT_USERAUTH */
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char *msg;
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if (asprintf(&msg, "EXPIRED: atime=%lld, ctime=%lld, src_addr=%s:%s, dst_addr=%s:%s, "
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#ifndef WITHOUT_USERAUTH
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"user=%s, "
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#endif /* !WITHOUT_USERAUTH */
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"valid=%d\n",
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(long long)atime, (long long)ctime,
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STRORDASH(ctx->srchost_str), STRORDASH(ctx->srcport_str), STRORDASH(ctx->dsthost_str), STRORDASH(ctx->dstport_str),
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#ifndef WITHOUT_USERAUTH
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STRORDASH(ctx->user),
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#endif /* !WITHOUT_USERAUTH */
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ctx->protoctx->is_valid) < 0) {
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break;
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}
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if (log_conn(msg) == -1) {
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log_err_level_printf(LOG_WARNING, "Expired conn logging failed\n");
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}
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free(msg);
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ctx = ctx->next_expired;
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}
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}
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}
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}
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static evutil_socket_t
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pxy_thr_print_children(pxy_conn_child_ctx_t *ctx)
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{
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evutil_socket_t max_fd = 0;
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while (ctx) {
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// No need to log child stats
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log_finest_main_va("CHILD CONN: thr=%d, id=%llu, cid=%d, src=%d, dst=%d, c=%d-%d",
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ctx->conn->thr->id, ctx->conn->id, ctx->id, ctx->fd, ctx->dst_fd, ctx->src.closed, ctx->dst.closed);
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max_fd = max(max_fd, max(ctx->fd, ctx->dst_fd));
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ctx = ctx->next;
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}
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return max_fd;
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}
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static void
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pxy_thr_print_info(pxy_thr_ctx_t *tctx)
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{
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log_finest_main_va("thr=%d, load=%zu", tctx->id, tctx->load);
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evutil_socket_t max_fd = 0;
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time_t max_atime = 0;
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time_t max_ctime = 0;
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char *smsg = NULL;
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if (tctx->conns) {
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time_t now = time(NULL);
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pxy_conn_ctx_t *ctx = tctx->conns;
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while (ctx) {
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time_t atime = now - ctx->atime;
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time_t ctime = now - ctx->ctime;
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#ifndef WITHOUT_USERAUTH
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log_finest_main_va("PARENT CONN: thr=%d, id=%llu, fd=%d, child_fd=%d, dst=%d, srvdst=%d, child_src=%d, child_dst=%d, p=%d-%d-%d c=%d-%d, ce=%d cc=%d, at=%lld ct=%lld, src_addr=%s:%s, dst_addr=%s:%s, user=%s, valid=%d",
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tctx->id, ctx->id, ctx->fd, ctx->child_fd, ctx->dst_fd, ctx->srvdst_fd, ctx->child_src_fd, ctx->child_dst_fd,
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ctx->src.closed, ctx->dst.closed, ctx->srvdst.closed, ctx->children ? ctx->children->src.closed : 0, ctx->children ? ctx->children->dst.closed : 0,
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ctx->children ? 1:0, ctx->child_count, (long long)atime, (long long)ctime,
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STRORDASH(ctx->srchost_str), STRORDASH(ctx->srcport_str), STRORDASH(ctx->dsthost_str), STRORDASH(ctx->dstport_str),
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STRORDASH(ctx->user), ctx->protoctx->is_valid);
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#else /* WITHOUT_USERAUTH */
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log_finest_main_va("PARENT CONN: thr=%d, id=%llu, fd=%d, child_fd=%d, dst=%d, srvdst=%d, child_src=%d, child_dst=%d, p=%d-%d-%d c=%d-%d, ce=%d cc=%d, at=%lld ct=%lld, src_addr=%s:%s, dst_addr=%s:%s, valid=%d",
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tctx->id, ctx->id, ctx->fd, ctx->child_fd, ctx->dst_fd, ctx->srvdst_fd, ctx->child_src_fd, ctx->child_dst_fd,
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ctx->src.closed, ctx->dst.closed, ctx->srvdst.closed, ctx->children ? ctx->children->src.closed : 0, ctx->children ? ctx->children->dst.closed : 0,
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ctx->children ? 1:0, ctx->child_count, (long long)atime, (long long)ctime,
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STRORDASH(ctx->srchost_str), STRORDASH(ctx->srcport_str), STRORDASH(ctx->dsthost_str), STRORDASH(ctx->dstport_str),
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ctx->protoctx->is_valid);
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#endif /* WITHOUT_USERAUTH */
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// @attention Report idle connections only, i.e. the conns which have been idle since the last time we checked for expired conns
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if (atime >= (time_t)tctx->thrmgr->global->expired_conn_check_period) {
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if (asprintf(&smsg, "IDLE: atime=%lld, ctime=%lld, src_addr=%s:%s, dst_addr=%s:%s, "
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#ifndef WITHOUT_USERAUTH
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"user=%s, "
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#endif /* !WITHOUT_USERAUTH */
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"valid=%d\n",
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(long long)atime, (long long)ctime,
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STRORDASH(ctx->srchost_str), STRORDASH(ctx->srcport_str), STRORDASH(ctx->dsthost_str), STRORDASH(ctx->dstport_str),
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#ifndef WITHOUT_USERAUTH
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STRORDASH(ctx->user),
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#endif /* !WITHOUT_USERAUTH */
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ctx->protoctx->is_valid) < 0) {
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return;
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}
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if (log_conn(smsg) == -1) {
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log_err_level_printf(LOG_WARNING, "Idle conn logging failed\n");
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}
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free(smsg);
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smsg = NULL;
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}
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// child_src_fd and child_dst_fd fields are mostly for debugging purposes, used in debug printing parent conns.
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// However, while an ssl child is closing, the children list may be empty, but child's ssl fd may be still open,
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// hence we include those fields in this max comparisons too
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max_fd = max(max_fd, max(ctx->fd, max(ctx->dst_fd, max(ctx->srvdst_fd, max(ctx->child_fd, max(ctx->child_src_fd, ctx->child_dst_fd))))));
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max_atime = util_max(max_atime, atime);
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max_ctime = util_max(max_ctime, ctime);
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if (ctx->children) {
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// @attention Do not pass pxy_thr_print_children() to MAX() or util_max() macro functions as param, or else it is called twice
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// Use the inline max() function instead
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max_fd = max(max_fd, pxy_thr_print_children(ctx->children));
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}
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ctx = ctx->next;
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}
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}
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log_finest_main_va("thr=%d, mld=%zu, mfd=%d, mat=%lld, mct=%lld, iib=%llu, iob=%llu, eib=%llu, eob=%llu, swm=%zu, uwm=%zu, to=%zu, err=%zu, si=%u",
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tctx->id, tctx->max_load, tctx->max_fd, (long long)max_atime, (long long)max_ctime, tctx->intif_in_bytes, tctx->intif_out_bytes, tctx->extif_in_bytes, tctx->extif_out_bytes,
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tctx->set_watermarks, tctx->unset_watermarks, tctx->timedout_conns, tctx->errors, tctx->stats_id);
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if (asprintf(&smsg, "STATS: thr=%d, mld=%zu, mfd=%d, mat=%lld, mct=%lld, iib=%llu, iob=%llu, eib=%llu, eob=%llu, swm=%zu, uwm=%zu, to=%zu, err=%zu, si=%u\n",
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tctx->id, tctx->max_load, tctx->max_fd, (long long)max_atime, (long long)max_ctime, tctx->intif_in_bytes, tctx->intif_out_bytes, tctx->extif_in_bytes, tctx->extif_out_bytes,
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tctx->set_watermarks, tctx->unset_watermarks, tctx->timedout_conns, tctx->errors, tctx->stats_id) < 0) {
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return;
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}
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if (log_stats(smsg) == -1) {
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log_err_level_printf(LOG_WARNING, "Stats logging failed\n");
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}
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free(smsg);
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tctx->stats_id++;
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tctx->timedout_conns = 0;
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tctx->errors = 0;
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tctx->set_watermarks = 0;
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tctx->unset_watermarks = 0;
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tctx->intif_in_bytes = 0;
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tctx->intif_out_bytes = 0;
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tctx->extif_in_bytes = 0;
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tctx->extif_out_bytes = 0;
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// Reset these stats with the current values (do not reset to 0 directly, there may be active conns)
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tctx->max_fd = max_fd;
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tctx->max_load = tctx->load;
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}
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/*
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* Recurring timer event to prevent the event loops from exiting when
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* they run out of events.
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*/
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static void
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pxy_thr_timer_cb(UNUSED evutil_socket_t fd, UNUSED short what, UNUSED void *arg)
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{
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pxy_thr_ctx_t *tctx = arg;
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log_finest_main_va("thr=%d, load=%zu, to=%u", tctx->id, tctx->load, tctx->timeout_count);
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pxy_conn_ctx_t *expired = NULL;
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pxy_thr_get_expired_conns(tctx, &expired);
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#ifdef DEBUG_PROXY
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if (expired) {
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time_t now = time(NULL);
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#endif /* DEBUG_PROXY */
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while (expired) {
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pxy_conn_ctx_t *next = expired->next_expired;
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log_fine_main_va("Delete timed out conn thr=%d, fd=%d, child_fd=%d, at=%lld ct=%lld",
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expired->thr->id, expired->fd, expired->child_fd, (long long)(now - expired->atime), (long long)(now - expired->ctime));
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// @attention Do not call the term function here, free the conn directly
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pxy_conn_free(expired, 1);
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tctx->timedout_conns++;
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expired = next;
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}
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#ifdef DEBUG_PROXY
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}
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#endif /* DEBUG_PROXY */
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// @attention Print thread info only if stats logging is enabled, if disabled debug logs are not printed either
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if (tctx->thrmgr->global->statslog) {
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tctx->timeout_count++;
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if (tctx->timeout_count >= tctx->thrmgr->global->stats_period) {
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tctx->timeout_count = 0;
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pxy_thr_print_info(tctx);
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}
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}
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}
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/*
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* Thread entry point; runs the event loop of the event base.
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* Does not exit until the libevent loop is broken explicitly.
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*/
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void *
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pxy_thr(void *arg)
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{
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pxy_thr_ctx_t *tctx = arg;
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struct timeval timer_delay = {tctx->thrmgr->global->expired_conn_check_period, 0};
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struct event *ev;
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ev = event_new(tctx->evbase, -1, EV_PERSIST, pxy_thr_timer_cb, tctx);
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if (!ev)
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return NULL;
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evtimer_add(ev, &timer_delay);
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tctx->running = 1;
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event_base_dispatch(tctx->evbase);
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event_free(ev);
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return NULL;
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}
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/* vim: set noet ft=c: */
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