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SSLproxy/pxyconn.c

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/*-
* SSLsplit - transparent SSL/TLS interception
* https://www.roe.ch/SSLsplit
*
* Copyright (c) 2009-2019, Daniel Roethlisberger <daniel@roe.ch>.
* Copyright (c) 2017-2019, Soner Tari <sonertari@gmail.com>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "pxyconn.h"
#include "prototcp.h"
#include "protossl.h"
#include "protohttp.h"
#include "protopop3.h"
#include "protosmtp.h"
#include "protoautossl.h"
#include "protopassthrough.h"
#include "privsep.h"
#include "sys.h"
#include "log.h"
#include "attrib.h"
#include "proc.h"
#include <string.h>
#include <arpa/inet.h>
#include <sys/param.h>
#include <assert.h>
#include <event2/listener.h>
#ifdef __linux__
#include <glob.h>
#endif /* __linux__ */
#include <net/if_arp.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <net/route.h>
#include <netinet/if_ether.h>
#ifdef __OpenBSD__
#include <net/if_dl.h>
#endif /* __OpenBSD__ */
/*
* Maximum size of data to buffer per connection direction before
* temporarily stopping to read data from the other end.
*/
#define OUTBUF_LIMIT (128*1024)
int descriptor_table_size = 0;
// @attention The order of names should match the order in protocol enum
char *protocol_names[] = {
// ERROR = -1
"PASSTHROUGH", // = 0
"HTTP",
"HTTPS",
"POP3",
"POP3S",
"SMTP",
"SMTPS",
"AUTOSSL",
"TCP",
"SSL",
};
static protocol_t NONNULL(1)
pxy_setup_proto(pxy_conn_ctx_t *ctx)
{
ctx->protoctx = malloc(sizeof(proto_ctx_t));
if (!ctx->protoctx) {
return PROTO_ERROR;
}
memset(ctx->protoctx, 0, sizeof(proto_ctx_t));
// Default to tcp
prototcp_setup(ctx);
protocol_t proto;
if (ctx->spec->upgrade) {
proto = protoautossl_setup(ctx);
} else if (ctx->spec->http) {
if (ctx->spec->ssl) {
proto = protohttps_setup(ctx);
} else {
proto = protohttp_setup(ctx);
}
} else if (ctx->spec->pop3) {
if (ctx->spec->ssl) {
proto = protopop3s_setup(ctx);
} else {
proto = protopop3_setup(ctx);
}
} else if (ctx->spec->smtp) {
if (ctx->spec->ssl) {
proto = protosmtps_setup(ctx);
} else {
proto = protosmtp_setup(ctx);
}
} else if (ctx->spec->ssl) {
proto = protossl_setup(ctx);
} else {
proto = PROTO_TCP;
}
if (proto == PROTO_ERROR) {
free(ctx->protoctx);
}
return proto;
}
static protocol_t NONNULL(1)
pxy_setup_proto_child(pxy_conn_child_ctx_t *ctx)
{
ctx->protoctx = malloc(sizeof(proto_child_ctx_t));
if (!ctx->protoctx) {
return PROTO_ERROR;
}
memset(ctx->protoctx, 0, sizeof(proto_child_ctx_t));
// Default to tcp
prototcp_setup_child(ctx);
protocol_t proto;
if (ctx->conn->spec->upgrade) {
proto = protoautossl_setup_child(ctx);
} else if (ctx->conn->spec->http) {
if (ctx->conn->spec->ssl) {
proto = protohttps_setup_child(ctx);
} else {
proto = protohttp_setup_child(ctx);
}
} else if (ctx->conn->spec->pop3) {
if (ctx->conn->spec->ssl) {
proto = (protossl_setup_child(ctx) != PROTO_ERROR) ? PROTO_POP3S : PROTO_ERROR;
} else {
proto = PROTO_POP3;
}
} else if (ctx->conn->spec->smtp) {
if (ctx->conn->spec->ssl) {
proto = (protossl_setup_child(ctx) != PROTO_ERROR) ? PROTO_SMTPS : PROTO_ERROR;
} else {
proto = PROTO_SMTP;
}
} else if (ctx->conn->spec->ssl) {
proto = protossl_setup_child(ctx);
} else {
proto = PROTO_TCP;
}
if (proto == PROTO_ERROR) {
free(ctx->protoctx);
}
return proto;
}
static pxy_conn_ctx_t * MALLOC NONNULL(2,3,4)
pxy_conn_ctx_new(evutil_socket_t fd,
pxy_thrmgr_ctx_t *thrmgr,
proxyspec_t *spec, global_t *global,
evutil_socket_t clisock)
{
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_conn_ctx_new: ENTER, fd=%d\n", fd);
#endif /* DEBUG_PROXY */
pxy_conn_ctx_t *ctx = malloc(sizeof(pxy_conn_ctx_t));
if (!ctx) {
return NULL;
}
memset(ctx, 0, sizeof(pxy_conn_ctx_t));
ctx->id = thrmgr->conn_count++;
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_conn_ctx_new: id=%llu, fd=%d\n", ctx->id, fd);
#endif /* DEBUG_PROXY */
ctx->type = CONN_TYPE_PARENT;
ctx->fd = fd;
ctx->conn = ctx;
ctx->thrmgr = thrmgr;
ctx->spec = spec;
ctx->proto = pxy_setup_proto(ctx);
if (ctx->proto == PROTO_ERROR) {
free(ctx);
return NULL;
}
ctx->global = global;
ctx->clisock = clisock;
ctx->ctime = time(NULL);
ctx->atime = ctx->ctime;
ctx->next = NULL;
pxy_thrmgr_attach(ctx);
#ifdef HAVE_LOCAL_PROCINFO
ctx->lproc.pid = -1;
#endif /* HAVE_LOCAL_PROCINFO */
return ctx;
}
static pxy_conn_child_ctx_t * MALLOC NONNULL(2)
pxy_conn_ctx_new_child(evutil_socket_t fd, pxy_conn_ctx_t *conn)
{
assert(conn != NULL);
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_conn_ctx_new_child: ENTER, child fd=%d, fd=%d\n", fd, conn->fd);
#endif /* DEBUG_PROXY */
pxy_conn_child_ctx_t *ctx = malloc(sizeof(pxy_conn_child_ctx_t));
if (!ctx) {
return NULL;
}
memset(ctx, 0, sizeof(pxy_conn_child_ctx_t));
ctx->type = CONN_TYPE_CHILD;
ctx->fd = fd;
ctx->conn = conn;
if (pxy_setup_proto_child(ctx) == PROTO_ERROR) {
free(ctx);
return NULL;
}
// @attention Child connections use the parent's event bases, otherwise we would get multithreading issues
pxy_thrmgr_attach_child(conn);
return ctx;
}
static void NONNULL(1)
pxy_conn_ctx_free_child(pxy_conn_child_ctx_t *ctx)
{
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_conn_ctx_free_child: ENTER, child fd=%d, fd=%d\n", ctx->fd, ctx->conn->fd);
#endif /* DEBUG_PROXY */
if (ctx->conn->thr_locked) {
pxy_thrmgr_detach_child_unlocked(ctx->conn);
} else {
pxy_thrmgr_detach_child(ctx->conn);
}
// If the proto doesn't have special args, proto_free() callback is NULL
if (ctx->protoctx->proto_free) {
ctx->protoctx->proto_free(ctx);
}
free(ctx->protoctx);
free(ctx);
}
static void NONNULL(1)
pxy_conn_remove_child(pxy_conn_child_ctx_t *ctx)
{
assert(ctx->conn != NULL);
assert(ctx->conn->children != NULL);
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_conn_remove_child: ENTER, child fd=%d, fd=%d\n", ctx->fd, ctx->conn->fd);
#endif /* DEBUG_PROXY */
if (ctx->fd == ctx->conn->children->fd) {
ctx->conn->children = ctx->conn->children->next;
return;
}
pxy_conn_child_ctx_t *current = ctx->conn->children->next;
pxy_conn_child_ctx_t *previous = ctx->conn->children;
while (current != NULL && previous != NULL) {
if (ctx->fd == current->fd) {
previous->next = current->next;
return;
}
previous = current;
current = current->next;
}
// This should never happen
log_err_level_printf(LOG_CRIT, "Cannot find child in conn children\n");
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINE, "pxy_conn_remove_child: Cannot find child in conn children, child fd=%d, fd=%d\n", ctx->fd, ctx->conn->fd);
#endif /* DEBUG_PROXY */
assert(0);
}
static void
pxy_conn_free_child(pxy_conn_child_ctx_t *ctx)
{
assert(ctx->conn != NULL);
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_conn_free_child: ENTER, child fd=%d, fd=%d\n", ctx->fd, ctx->conn->fd);
#endif /* DEBUG_PROXY */
// We always assign NULL to bevs after freeing them
if (ctx->src.bev) {
ctx->src.free(ctx->src.bev, ctx->conn);
ctx->src.bev = NULL;
} else if (!ctx->src.closed) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINE, "pxy_conn_free_child: evutil_closesocket on NULL src->bev, fd=%d\n", ctx->fd);
#endif /* DEBUG_PROXY */
// @attention early in the conn setup, src fd may be open, although src.bev is NULL
evutil_closesocket(ctx->fd);
}
if (ctx->dst.bev) {
ctx->dst.free(ctx->dst.bev, ctx->conn);
ctx->dst.bev = NULL;
}
pxy_conn_remove_child(ctx);
pxy_conn_ctx_free_child(ctx);
}
void
pxy_conn_term_child(pxy_conn_child_ctx_t *ctx)
{
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_conn_term_child: ENTER, child fd=%d, fd=%d\n", ctx->fd, ctx->conn->fd);
#endif /* DEBUG_PROXY */
ctx->term = 1;
}
void
pxy_conn_free_children(pxy_conn_ctx_t *ctx)
{
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_conn_free_children: ENTER, fd=%d\n", ctx->fd);
#endif /* DEBUG_PROXY */
// @attention Free the child ctxs asap, we need their fds
while (ctx->children) {
pxy_conn_free_child(ctx->children);
}
// @attention Parent may be closing before there was any child at all nor was child_evcl ever created
if (ctx->child_evcl) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINER, "pxy_conn_free_children: Freeing child_evcl, child fd=%d, children fd=%d, fd=%d\n",
ctx->child_fd, ctx->children ? ctx->children->fd : -1, ctx->fd);
#endif /* DEBUG_PROXY */
// @attention child_evcl was created with LEV_OPT_CLOSE_ON_FREE, so do not close ctx->child_fd
evconnlistener_free(ctx->child_evcl);
ctx->child_evcl = NULL;
}
}
void
pxy_conn_ctx_free(pxy_conn_ctx_t *ctx, int by_requestor)
{
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_conn_ctx_free: ENTER, fd=%d\n", ctx->fd);
#endif /* DEBUG_PROXY */
if (WANT_CONTENT_LOG(ctx)) {
if (log_content_close(&ctx->logctx, by_requestor) == -1) {
log_err_level_printf(LOG_WARNING, "Content log close failed\n");
}
}
if (ctx->spec->opts->user_auth && ctx->srchost_str && ctx->user && ctx->ether) {
// Update userdb atime if idle time is more than 50% of user timeout, which is expected to reduce update frequency
unsigned int idletime = ctx->idletime + (time(NULL) - ctx->ctime);
if (idletime > (ctx->spec->opts->user_timeout / 2)) {
userdbkeys_t keys;
// Zero out for NULL termination
memset(&keys, 0, sizeof(userdbkeys_t));
// Leave room for NULL to make sure the strings are always NULL terminated
strncpy(keys.ip, ctx->srchost_str, sizeof(keys.ip) - 1);
strncpy(keys.user, ctx->user, sizeof(keys.user) - 1);
strncpy(keys.ether, ctx->ether, sizeof(keys.ether) - 1);
if (privsep_client_update_atime(ctx->clisock, &keys) == -1) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_conn_ctx_free: Error updating user atime: %s, fd=%d\n", sqlite3_errmsg(ctx->global->userdb), ctx->fd);
#endif /* DEBUG_PROXY */
} else {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_conn_ctx_free: Successfully updated user atime, fd=%d\n", ctx->fd);
#endif /* DEBUG_PROXY */
}
} else {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_conn_ctx_free: Will not update user atime, idletime=%u, fd=%d\n", idletime, ctx->fd);
#endif /* DEBUG_PROXY */
}
}
if (ctx->conn->thr_locked) {
pxy_thrmgr_detach_unlocked(ctx);
} else {
pxy_thrmgr_detach(ctx);
}
if (ctx->srchost_str) {
free(ctx->srchost_str);
}
if (ctx->srcport_str) {
free(ctx->srcport_str);
}
if (ctx->dsthost_str) {
free(ctx->dsthost_str);
}
if (ctx->dstport_str) {
free(ctx->dstport_str);
}
#ifdef HAVE_LOCAL_PROCINFO
if (ctx->lproc.exec_path) {
free(ctx->lproc.exec_path);
}
if (ctx->lproc.user) {
free(ctx->lproc.user);
}
if (ctx->lproc.group) {
free(ctx->lproc.group);
}
#endif /* HAVE_LOCAL_PROCINFO */
if (ctx->ev) {
event_free(ctx->ev);
}
if (ctx->sslproxy_header) {
free(ctx->sslproxy_header);
}
// If the proto doesn't have special args, proto_free() callback is NULL
if (ctx->protoctx->proto_free) {
ctx->protoctx->proto_free(ctx);
}
free(ctx->protoctx);
if (ctx->user) {
free(ctx->user);
}
if (ctx->ether) {
free(ctx->ether);
}
if (ctx->desc) {
free(ctx->desc);
}
free(ctx);
}
void
pxy_conn_free(pxy_conn_ctx_t *ctx, int by_requestor)
{
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_conn_free: ENTER, fd=%d\n", ctx->fd);
#endif /* DEBUG_PROXY */
// We always assign NULL to bevs after freeing them
if (ctx->src.bev) {
ctx->src.free(ctx->src.bev, ctx);
ctx->src.bev = NULL;
} else if (!ctx->src.closed) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINE, "pxy_conn_free: evutil_closesocket on NULL src->bev, fd=%d\n", ctx->fd);
#endif /* DEBUG_PROXY */
// @attention early in the conn setup, src fd may be open, although src.bev is NULL
evutil_closesocket(ctx->fd);
}
// If srvdst has been xferred to the first child conn, the child should free it, not the parent
if (!ctx->srvdst_xferred && ctx->srvdst.bev) {
ctx->srvdst.free(ctx->srvdst.bev, ctx);
ctx->srvdst.bev = NULL;
}
if (ctx->dst.bev) {
ctx->dst.free(ctx->dst.bev, ctx);
ctx->dst.bev = NULL;
}
pxy_conn_free_children(ctx);
pxy_conn_ctx_free(ctx, by_requestor);
}
void
pxy_conn_term(pxy_conn_ctx_t *ctx, int by_requestor)
{
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_conn_term: ENTER, fd=%d\n", ctx->fd);
#endif /* DEBUG_PROXY */
ctx->term = 1;
ctx->term_requestor = by_requestor;
}
void
pxy_log_connect_nonhttp(pxy_conn_ctx_t *ctx)
{
char *msg;
#ifdef HAVE_LOCAL_PROCINFO
char *lpi = NULL;
#endif /* HAVE_LOCAL_PROCINFO */
int rv;
#ifdef HAVE_LOCAL_PROCINFO
if (ctx->global->lprocinfo) {
rv = asprintf(&lpi, "lproc:%i:%s:%s:%s",
ctx->lproc.pid,
STRORDASH(ctx->lproc.user),
STRORDASH(ctx->lproc.group),
STRORDASH(ctx->lproc.exec_path));
if ((rv < 0) || !lpi) {
ctx->enomem = 1;
goto out;
}
} else {
lpi = "";
}
#endif /* HAVE_LOCAL_PROCINFO */
/*
* The following ifdef's within asprintf arguments list generates
* warnings with -Wembedded-directive on some compilers.
* Not fixing the code in order to avoid more code duplication.
*/
if (!ctx->src.ssl) {
rv = asprintf(&msg, "CONN: %s %s %s %s %s"
#ifdef HAVE_LOCAL_PROCINFO
" %s"
#endif /* HAVE_LOCAL_PROCINFO */
" user:%s\n",
ctx->proto == PROTO_PASSTHROUGH ? "passthrough" : (ctx->proto == PROTO_POP3 ? "pop3" : (ctx->proto == PROTO_SMTP ? "smtp" : "tcp")),
STRORDASH(ctx->srchost_str),
STRORDASH(ctx->srcport_str),
STRORDASH(ctx->dsthost_str),
STRORDASH(ctx->dstport_str),
#ifdef HAVE_LOCAL_PROCINFO
lpi,
#endif /* HAVE_LOCAL_PROCINFO */
STRORDASH(ctx->user));
} else {
rv = asprintf(&msg, "CONN: %s %s %s %s %s "
"sni:%s names:%s "
"sproto:%s:%s dproto:%s:%s "
"origcrt:%s usedcrt:%s"
#ifdef HAVE_LOCAL_PROCINFO
" %s"
#endif /* HAVE_LOCAL_PROCINFO */
" user:%s\n",
ctx->proto == PROTO_AUTOSSL ? "autossl" : (ctx->proto == PROTO_POP3S ? "pop3s" : (ctx->proto == PROTO_SMTPS ? "smtps" : "ssl")),
STRORDASH(ctx->srchost_str),
STRORDASH(ctx->srcport_str),
STRORDASH(ctx->dsthost_str),
STRORDASH(ctx->dstport_str),
STRORDASH(ctx->sslctx->sni),
STRORDASH(ctx->sslctx->ssl_names),
SSL_get_version(ctx->src.ssl),
SSL_get_cipher(ctx->src.ssl),
STRORDASH(ctx->sslctx->srvdst_ssl_version),
STRORDASH(ctx->sslctx->srvdst_ssl_cipher),
STRORDASH(ctx->sslctx->origcrtfpr),
STRORDASH(ctx->sslctx->usedcrtfpr),
#ifdef HAVE_LOCAL_PROCINFO
lpi,
#endif /* HAVE_LOCAL_PROCINFO */
STRORDASH(ctx->user));
}
if ((rv < 0) || !msg) {
ctx->enomem = 1;
goto out;
}
if (!ctx->global->detach) {
log_err_printf("%s", msg);
} else if (ctx->global->statslog) {
if (log_conn(msg) == -1) {
log_err_level_printf(LOG_WARNING, "Conn logging failed\n");
}
}
if (ctx->global->connectlog) {
if (log_connect_print_free(msg) == -1) {
free(msg);
log_err_level_printf(LOG_WARNING, "Connection logging failed\n");
}
} else {
free(msg);
}
out:
#ifdef HAVE_LOCAL_PROCINFO
if (lpi && ctx->global->lprocinfo) {
free(lpi);
}
#endif /* HAVE_LOCAL_PROCINFO */
return;
}
int
pxy_log_content_inbuf(pxy_conn_ctx_t *ctx, struct evbuffer *inbuf, int req)
{
size_t sz = evbuffer_get_length(inbuf);
unsigned char *buf = malloc(sz);
if (!buf) {
ctx->enomem = 1;
return -1;
}
if (evbuffer_copyout(inbuf, buf, sz) == -1) {
free(buf);
return -1;
}
logbuf_t *lb = logbuf_new_alloc(sz, NULL);
if (!lb) {
free(buf);
ctx->enomem = 1;
return -1;
}
memcpy(lb->buf, buf, lb->sz);
free(buf);
if (log_content_submit(&ctx->logctx, lb, req) == -1) {
logbuf_free(lb);
log_err_level_printf(LOG_WARNING, "Content log submission failed\n");
return -1;
}
return 0;
}
#ifdef HAVE_LOCAL_PROCINFO
int
pxy_prepare_logging_local_procinfo(pxy_conn_ctx_t *ctx)
{
if (ctx->global->lprocinfo) {
/* fetch process info */
if (proc_pid_for_addr(&ctx->lproc.pid,
(struct sockaddr*)&ctx->lproc.srcaddr,
ctx->lproc.srcaddrlen) == 0 &&
ctx->lproc.pid != -1 &&
proc_get_info(ctx->lproc.pid,
&ctx->lproc.exec_path,
&ctx->lproc.uid,
&ctx->lproc.gid) == 0) {
/* fetch user/group names */
ctx->lproc.user = sys_user_str(
ctx->lproc.uid);
ctx->lproc.group = sys_group_str(
ctx->lproc.gid);
if (!ctx->lproc.user ||
!ctx->lproc.group) {
ctx->enomem = 1;
pxy_conn_term(ctx, 1);
return -1;
}
}
}
return 0;
}
#endif /* HAVE_LOCAL_PROCINFO */
static int
pxy_prepare_logging(pxy_conn_ctx_t *ctx)
{
/* prepare logging, part 2 */
#ifdef HAVE_LOCAL_PROCINFO
if (WANT_CONNECT_LOG(ctx) || WANT_CONTENT_LOG(ctx)) {
if (pxy_prepare_logging_local_procinfo(ctx) == -1) {
return -1;
}
}
#endif /* HAVE_LOCAL_PROCINFO */
if (WANT_CONTENT_LOG(ctx)) {
if (log_content_open(&ctx->logctx, ctx->global,
(struct sockaddr *)&ctx->srcaddr,
ctx->srcaddrlen,
(struct sockaddr *)&ctx->dstaddr,
ctx->dstaddrlen,
STRORDASH(ctx->srchost_str), STRORDASH(ctx->srcport_str),
STRORDASH(ctx->dsthost_str), STRORDASH(ctx->dstport_str),
#ifdef HAVE_LOCAL_PROCINFO
ctx->lproc.exec_path,
ctx->lproc.user,
ctx->lproc.group
#else /* HAVE_LOCAL_PROCINFO */
NULL, NULL, NULL
#endif /* HAVE_LOCAL_PROCINFO */
) == -1) {
if (errno == ENOMEM)
ctx->enomem = 1;
pxy_conn_term(ctx, 1);
return -1;
}
}
return 0;
}
static void NONNULL(1,2)
pxy_log_dbg_connect_type(pxy_conn_ctx_t *ctx, pxy_conn_desc_t *this)
{
if (OPTS_DEBUG(ctx->global)) {
if (this->ssl) {
char *keystr;
/* for SSL, we get two connect events */
log_dbg_printf("%s connected to [%s]:%s %s %s\n",
protocol_names[ctx->proto],
STRORDASH(ctx->dsthost_str), STRORDASH(ctx->dstport_str),
SSL_get_version(this->ssl), SSL_get_cipher(this->ssl));
keystr = ssl_ssl_masterkey_to_str(this->ssl);
if (keystr) {
log_dbg_print_free(keystr);
}
} else {
/* for TCP, we get only a dst connect event,
* since src was already connected from the
* beginning; mirror SSL debug output anyway
* in order not to confuse anyone who might be
* looking closely at the output */
log_dbg_printf("%s connected to [%s]:%s\n",
protocol_names[ctx->proto],
STRORDASH(ctx->dsthost_str), STRORDASH(ctx->dstport_str));
log_dbg_printf("%s connected from [%s]:%s\n",
protocol_names[ctx->proto],
STRORDASH(ctx->srchost_str), STRORDASH(ctx->srcport_str));
}
}
}
void
pxy_log_connect_src(pxy_conn_ctx_t *ctx)
{
/* log connection if we don't analyze any headers */
if (!ctx->spec->http && WANT_CONNECT_LOG(ctx)) {
pxy_log_connect_nonhttp(ctx);
}
if (ctx->src.ssl && ctx->global->certgendir) {
/* write SSL certificates to gendir */
protossl_srccert_write(ctx);
}
if (protossl_log_masterkey(ctx, &ctx->src) == -1) {
return;
}
pxy_log_dbg_connect_type(ctx, &ctx->src);
}
void
pxy_log_connect_srvdst(pxy_conn_ctx_t *ctx)
{
// @attention srvdst.bev may be NULL, if its writecb fires first
if (ctx->srvdst.bev) {
/* log connection if we don't analyze any headers */
if (!ctx->srvdst.ssl && !ctx->spec->http && WANT_CONNECT_LOG(ctx)) {
pxy_log_connect_nonhttp(ctx);
}
if (protossl_log_masterkey(ctx, &ctx->srvdst) == -1) {
return;
}
pxy_log_dbg_connect_type(ctx, &ctx->srvdst);
}
}
static void
pxy_log_dbg_disconnect(pxy_conn_ctx_t *ctx)
{
/* we only get a single disconnect event here for both connections */
if (OPTS_DEBUG(ctx->global)) {
log_dbg_printf("%s disconnected to [%s]:%s, fd=%d\n",
protocol_names[ctx->proto],
STRORDASH(ctx->dsthost_str), STRORDASH(ctx->dstport_str), ctx->fd);
log_dbg_printf("%s disconnected from [%s]:%s, fd=%d\n",
protocol_names[ctx->proto],
STRORDASH(ctx->srchost_str), STRORDASH(ctx->srcport_str), ctx->fd);
}
}
static void
pxy_log_dbg_disconnect_child(pxy_conn_child_ctx_t *ctx)
{
/* we only get a single disconnect event here for both connections */
if (OPTS_DEBUG(ctx->conn->global)) {
log_dbg_printf("Child %s disconnected to [%s]:%s, child fd=%d, fd=%d\n",
protocol_names[ctx->conn->proto],
STRORDASH(ctx->conn->dsthost_str), STRORDASH(ctx->conn->dstport_str), ctx->fd, ctx->conn->fd);
log_dbg_printf("Child %s disconnected from [%s]:%s, child fd=%d, fd=%d\n",
protocol_names[ctx->conn->proto],
STRORDASH(ctx->conn->srchost_str), STRORDASH(ctx->conn->srcport_str), ctx->fd, ctx->conn->fd);
}
}
#ifdef DEBUG_PROXY
void
pxy_log_dbg_evbuf_info(pxy_conn_ctx_t *ctx, pxy_conn_desc_t *this, pxy_conn_desc_t *other)
{
// Use ctx->conn, because this function is used by child conns too
if (OPTS_DEBUG(ctx->conn->global)) {
log_dbg_printf("evbuffer size at EOF: i:%zu o:%zu i:%zu o:%zu\n",
evbuffer_get_length(bufferevent_get_input(this->bev)),
evbuffer_get_length(bufferevent_get_output(this->bev)),
other->closed ? 0 : evbuffer_get_length(bufferevent_get_input(other->bev)),
other->closed ? 0 : evbuffer_get_length(bufferevent_get_output(other->bev)));
}
}
#endif /* DEBUG_PROXY */
unsigned char *
pxy_malloc_packet(size_t sz, pxy_conn_ctx_t *ctx)
{
unsigned char *packet = malloc(sz);
if (!packet) {
ctx->enomem = 1;
return NULL;
}
return packet;
}
#ifdef DEBUG_PROXY
char *bev_names[] = {
"src",
"dst",
"srvdst",
"NULL",
"UNKWN"
};
static char *
pxy_get_event_name(struct bufferevent *bev, pxy_conn_ctx_t *ctx)
{
// XXX: Used by watermark functions only, remove
if (bev == ctx->src.bev) {
return bev_names[0];
} else if (bev == ctx->dst.bev) {
return bev_names[1];
} else if (bev == ctx->srvdst.bev) {
return bev_names[2];
} else if (bev == NULL) {
log_dbg_level_printf(LOG_DBG_MODE_FINE, "pxy_get_event_name: event_name=NULL\n");
return bev_names[3];
} else {
log_dbg_level_printf(LOG_DBG_MODE_FINE, "pxy_get_event_name: event_name=UNKWN\n");
return bev_names[4];
}
}
#endif /* DEBUG_PROXY */
void
pxy_try_set_watermark(struct bufferevent *bev, pxy_conn_ctx_t *ctx, struct bufferevent *other)
{
if (evbuffer_get_length(bufferevent_get_output(other)) >= OUTBUF_LIMIT) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINE, "pxy_try_set_watermark: %s, fd=%d\n", pxy_get_event_name(bev, ctx), ctx->fd);
#endif /* DEBUG_PROXY */
/* temporarily disable data source;
* set an appropriate watermark. */
bufferevent_setwatermark(other, EV_WRITE, OUTBUF_LIMIT/2, OUTBUF_LIMIT);
bufferevent_disable(bev, EV_READ);
ctx->thr->set_watermarks++;
}
}
void
pxy_try_unset_watermark(struct bufferevent *bev, pxy_conn_ctx_t *ctx, pxy_conn_desc_t *other)
{
if (other->bev && !(bufferevent_get_enabled(other->bev) & EV_READ)) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINE, "pxy_try_unset_watermark: %s, fd=%d\n", pxy_get_event_name(bev, ctx), ctx->fd);
#endif /* DEBUG_PROXY */
/* data source temporarily disabled;
* re-enable and reset watermark to 0. */
bufferevent_setwatermark(bev, EV_WRITE, 0, 0);
bufferevent_enable(other->bev, EV_READ);
ctx->thr->unset_watermarks++;
}
}
void
pxy_discard_inbuf(struct bufferevent *bev)
{
struct evbuffer *inbuf = bufferevent_get_input(bev);
size_t inbuf_size = evbuffer_get_length(inbuf);
log_dbg_printf("Warning: Drained %zu bytes (conn closed)\n", inbuf_size);
evbuffer_drain(inbuf, inbuf_size);
}
void
pxy_insert_sslproxy_header(pxy_conn_ctx_t *ctx, unsigned char *packet, size_t *packet_size)
{
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINER, "pxy_insert_sslproxy_header: ENTER, fd=%d\n", ctx->fd);
#endif /* DEBUG_PROXY */
// @attention Cannot use string manipulation functions; we are dealing with binary arrays here, not NULL-terminated strings
memmove(packet + ctx->sslproxy_header_len + 2, packet, *packet_size);
memcpy(packet, ctx->sslproxy_header, ctx->sslproxy_header_len);
memcpy(packet + ctx->sslproxy_header_len, "\r\n", 2);
*packet_size += ctx->sslproxy_header_len + 2;
ctx->sent_sslproxy_header = 1;
}
void
pxy_try_remove_sslproxy_header(pxy_conn_child_ctx_t *ctx, unsigned char *packet, size_t *packet_size)
{
// @attention Cannot use string manipulation functions; we are dealing with binary arrays here, not NULL-terminated strings
unsigned char *pos = memmem(packet, *packet_size, ctx->conn->sslproxy_header, ctx->conn->sslproxy_header_len);
if (pos) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINER, "pxy_try_remove_sslproxy_header: REMOVE, child fd=%d, fd=%d\n", ctx->fd, ctx->conn->fd);
#endif /* DEBUG_PROXY */
memmove(pos, pos + ctx->conn->sslproxy_header_len + 2, *packet_size - (pos - packet) - (ctx->conn->sslproxy_header_len + 2));
*packet_size -= ctx->conn->sslproxy_header_len + 2;
ctx->removed_sslproxy_header = 1;
}
}
#if defined(__APPLE__) || defined(__FreeBSD__)
#define getdtablecount() 0
/*
* Copied from:
* opensmtpd-201801101641p1/openbsd-compat/imsg.c
*
* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
static int
available_fds(unsigned int n)
{
unsigned int i;
int ret, fds[256];
if (n > (sizeof(fds)/sizeof(fds[0])))
return -1;
ret = 0;
for (i = 0; i < n; i++) {
fds[i] = -1;
if ((fds[i] = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
ret = -1;
break;
}
}
for (i = 0; i < n && fds[i] >= 0; i++)
close(fds[i]);
return ret;
}
#endif /* __APPLE__ || __FreeBSD__ */
#ifdef __linux__
/*
* Copied from:
* https://github.com/tmux/tmux/blob/master/compat/getdtablecount.c
*
* Copyright (c) 2017 Nicholas Marriott <nicholas.marriott@gmail.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
int
getdtablecount()
{
char path[PATH_MAX];
glob_t g;
int n = 0;
if (snprintf(path, sizeof path, "/proc/%ld/fd/*", (long)getpid()) < 0) {
log_err_level_printf(LOG_CRIT, "snprintf overflow\n");
return 0;
}
if (glob(path, 0, NULL, &g) == 0)
n = g.gl_pathc;
globfree(&g);
return n;
}
#endif /* __linux__ */
/*
* Check if we are out of file descriptors to close the conn, or else libevent will crash us
* @attention We cannot guess the number of children in a connection at conn setup time. So, FD_RESERVE is just a ball park figure.
* But what if a connection passes the check below, but eventually tries to create more children than FD_RESERVE allows for? This will crash us the same.
* Beware, this applies to all current conns, not just the last connection setup.
* For example, 20x conns pass the check below before creating any children, at which point we reach the last FD_RESERVE fds,
* then they all start creating children, which crashes us again.
* So, no matter how large an FD_RESERVE we choose, there will always be a risk of running out of fds, if we check the number of fds during parent conn setup only.
* If we are left with less than FD_RESERVE fds, we should not create more children than FD_RESERVE allows for either.
* Therefore, we check if we are out of fds in pxy_listener_acceptcb_child() and close the conn there too.
* @attention These checks are expected to slow us further down, but it is critical to avoid a crash in case we run out of fds.
*/
static int
check_fd_usage(
#ifdef DEBUG_PROXY
evutil_socket_t fd
#endif /* DEBUG_PROXY */
)
{
int dtable_count = getdtablecount();
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINER, "check_fd_usage: descriptor_table_size=%d, dtablecount=%d, reserve=%d, fd=%d\n",
descriptor_table_size, dtable_count, FD_RESERVE, fd);
#endif /* DEBUG_PROXY */
if (dtable_count + FD_RESERVE >= descriptor_table_size) {
goto out;
}
#if defined(__APPLE__) || defined(__FreeBSD__)
if (available_fds(FD_RESERVE) == -1) {
goto out;
}
#endif /* __APPLE__ || __FreeBSD__ */
return 0;
out:
errno = EMFILE;
log_err_level_printf(LOG_CRIT, "Out of file descriptors\n");
return -1;
}
/*
* Callback for accept events on the socket listener bufferevent.
*/
static void
pxy_listener_acceptcb_child(UNUSED struct evconnlistener *listener, evutil_socket_t fd,
UNUSED struct sockaddr *peeraddr, UNUSED int peeraddrlen, void *arg)
{
pxy_conn_ctx_t *conn = arg;
conn->atime = time(NULL);
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_listener_acceptcb_child: ENTER, child fd=%d, child_fd=%d, fd=%d\n", fd, conn->child_fd, conn->fd);
char *host, *port;
if (sys_sockaddr_str(peeraddr, peeraddrlen, &host, &port) == 0) {
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_listener_acceptcb_child: peer addr=[%s]:%s, child fd=%d, fd=%d\n", host, port, fd, conn->fd);
free(host);
free(port);
}
#endif /* DEBUG_PROXY */
if (!conn->dstaddrlen) {
log_err_level_printf(LOG_CRIT, "Child no target address; aborting connection\n");
evutil_closesocket(fd);
pxy_conn_term(conn, 1);
goto out;
}
if (check_fd_usage(
#ifdef DEBUG_PROXY
conn->fd
#endif /* DEBUG_PROXY */
) == -1) {
evutil_closesocket(fd);
pxy_conn_term(conn, 1);
goto out;
}
pxy_conn_child_ctx_t *ctx = pxy_conn_ctx_new_child(fd, conn);
if (!ctx) {
log_err_level_printf(LOG_CRIT, "Error allocating memory\n");
evutil_closesocket(fd);
pxy_conn_term(conn, 1);
goto out;
}
conn->thr->max_load = MAX(conn->thr->max_load, conn->thr->load);
conn->child_count++;
// Prepend child ctx to conn ctx child list
// @attention If the last child is deleted, the children list may become null again
ctx->next = conn->children;
conn->children = ctx;
// @attention Do not enable src events here yet, they will be enabled after dst connects
if (prototcp_setup_src_child(ctx) == -1) {
goto out;
}
// @attention fd (ctx->fd) is different from child event listener fd (conn->child_fd)
conn->thr->max_fd = MAX(conn->thr->max_fd, ctx->fd);
conn->child_src_fd = ctx->fd;
/* create server-side socket and eventbuffer */
// Children rely on the findings of parent
ctx->protoctx->connectcb(ctx);
if (conn->term || conn->enomem) {
goto out;
}
bufferevent_enable(ctx->dst.bev, EV_READ|EV_WRITE);
if (OPTS_DEBUG(conn->global)) {
char *host, *port;
if (sys_sockaddr_str((struct sockaddr *)&conn->dstaddr, conn->dstaddrlen, &host, &port) == 0) {
log_dbg_printf("Child connecting to [%s]:%s\n", host, port);
free(host);
free(port);
} else {
log_dbg_printf("Child connecting to [?]:?\n");
}
}
/* initiate connection, except for the first child conn which uses the parent's srvdst as dst */
if (ctx->dst.bev != conn->srvdst.bev) {
if (bufferevent_socket_connect(ctx->dst.bev, (struct sockaddr *)&conn->dstaddr, conn->dstaddrlen) == -1) {
pxy_conn_term(conn, 1);
goto out;
}
}
ctx->dst_fd = bufferevent_getfd(ctx->dst.bev);
conn->child_dst_fd = ctx->dst_fd;
conn->thr->max_fd = MAX(conn->thr->max_fd, ctx->dst_fd);
// Do not return here, but continue and check term/enomem flags below
out:
// @attention Do not use ctx->conn here, ctx may be uninitialized
// @attention Call pxy_conn_free() directly, not pxy_conn_term() here
// This is our last chance to close and free the conn
if (conn->term || conn->enomem) {
pxy_conn_free(conn, conn->term ? conn->term_requestor : 1);
}
}
int
pxy_setup_child_listener(pxy_conn_ctx_t *ctx)
{
// @attention Defer child setup and evcl creation until after parent init is complete, otherwise (1) causes multithreading issues (proxy_listener_acceptcb is
// running on a different thread from the conn, and we only have thrmgr mutex), and (2) we need to clean up less upon errors.
// Child evcls use the evbase of the parent thread, otherwise we would get multithreading issues.
if ((ctx->child_fd = privsep_client_opensock_child(ctx->clisock, ctx->spec)) == -1) {
log_err_level_printf(LOG_CRIT, "Error opening child socket: %s (%i)\n", strerror(errno), errno);
pxy_conn_term(ctx, 1);
return -1;
}
ctx->thr->max_fd = MAX(ctx->thr->max_fd, ctx->child_fd);
// @attention Do not pass NULL as user-supplied pointer
struct evconnlistener *child_evcl = evconnlistener_new(ctx->thr->evbase, pxy_listener_acceptcb_child, ctx, LEV_OPT_CLOSE_ON_FREE, 1024, ctx->child_fd);
if (!child_evcl) {
log_err_level_printf(LOG_CRIT, "Error creating child evconnlistener: %s\n", strerror(errno));
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINE, "pxy_setup_child_listener: Error creating child evconnlistener: %s, child_fd=%d, fd=%d\n", strerror(errno), ctx->child_fd, ctx->fd);
#endif /* DEBUG_PROXY */
// @attention Cannot call proxy_listener_ctx_free() on child_evcl, child_evcl does not have any ctx with next listener
// @attention Close child fd separately, because child evcl does not exist yet, hence fd would not be closed by calling pxy_conn_free()
evutil_closesocket(ctx->child_fd);
pxy_conn_term(ctx, 1);
return -1;
}
ctx->child_evcl = child_evcl;
evconnlistener_set_error_cb(child_evcl, proxy_listener_errorcb);
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINER, "pxy_setup_child_listener: Finished setting up child, NEW child_fd=%d, fd=%d\n", ctx->child_fd, ctx->fd);
#endif /* DEBUG_PROXY */
struct sockaddr_in child_listener_addr;
socklen_t child_listener_len = sizeof(child_listener_addr);
if (getsockname(ctx->child_fd, (struct sockaddr *)&child_listener_addr, &child_listener_len) < 0) {
log_err_level_printf(LOG_CRIT, "Error in getsockname: %s\n", strerror(errno));
// @todo If getsockname() fails, should we really terminate the connection?
// @attention Do not close the child fd here, because child evcl exists now, hence pxy_conn_free() will close it while freeing child_evcl
pxy_conn_term(ctx, 1);
return -1;
}
// @attention Children are assumed to be listening on an IPv4 address
// @todo IPv6?
char addr[INET_ADDRSTRLEN];
if (!inet_ntop(AF_INET, &child_listener_addr.sin_addr, addr, INET_ADDRSTRLEN)) {
pxy_conn_term(ctx, 1);
return -1;
}
if (pxy_set_dstaddr(ctx) == -1) {
return -1;
}
int user_len = 0;
if (ctx->spec->opts->user_auth && ctx->user) {
// +1 for comma
user_len = strlen(ctx->user) + 1;
}
// SSLproxy: [127.0.0.1]:34649,[192.168.3.24]:47286,[74.125.206.108]:465,s,soner
// @todo Port may be less than 5 chars
// SSLproxy: + + [ + addr + ] + : + p + , + [ + srchost_str + ] + : + srcport_str + , + [ + dsthost_str + ] + : + dstport_str + , + s + , + user
// SSLPROXY_KEY_LEN + 1 + 1 + strlen(addr) + 1 + 1 + 5 + 1 + 1 + strlen(ctx->srchost_str) + 1 + 1 + strlen(ctx->srcport_str) + 1 + 1 + strlen(ctx->dsthost_str) + 1 + 1 + strlen(ctx->dstport_str) + 1 + 1 + 1 + strlen(ctx->user)
ctx->sslproxy_header_len = SSLPROXY_KEY_LEN + strlen(addr) + strlen(ctx->srchost_str) + strlen(ctx->srcport_str) + strlen(ctx->dsthost_str) + strlen(ctx->dstport_str) + 19 + user_len;
// +1 for NULL
ctx->sslproxy_header = malloc(ctx->sslproxy_header_len + 1);
if (!ctx->sslproxy_header) {
pxy_conn_term(ctx, 1);
return -1;
}
// printf(3): "snprintf() will write at most size-1 of the characters (the size'th character then gets the terminating NULL)"
// So, +1 for NULL
snprintf(ctx->sslproxy_header, ctx->sslproxy_header_len + 1, "%s [%s]:%u,[%s]:%s,[%s]:%s,%s%s%s",
SSLPROXY_KEY, addr, ntohs(child_listener_addr.sin_port), STRORNONE(ctx->srchost_str), STRORNONE(ctx->srcport_str),
STRORNONE(ctx->dsthost_str), STRORNONE(ctx->dstport_str), ctx->spec->ssl ? "s":"p", user_len ? "," : "", user_len ? ctx->user : "");
return 0;
}
int
pxy_try_close_conn_end(pxy_conn_desc_t *conn_end, pxy_conn_ctx_t *ctx)
{
/* if the other end is still open and doesn't have data
* to send, close it, otherwise its writecb will close
* it after writing what's left in the output buffer */
if (evbuffer_get_length(bufferevent_get_output(conn_end->bev)) == 0) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_try_close_conn_end: evbuffer_get_length(outbuf) == 0, terminate conn, fd=%d\n", ctx->fd);
#endif /* DEBUG_PROXY */
conn_end->free(conn_end->bev, ctx);
conn_end->bev = NULL;
conn_end->closed = 1;
return 1;
}
return 0;
}
int
pxy_connect_srvdst(struct bufferevent *bev, pxy_conn_ctx_t *ctx)
{
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINE, "pxy_connect_srvdst: writecb before connected, fd=%d\n", ctx->fd);
#endif /* DEBUG_PROXY */
// @attention Sometimes dst write cb fires but not event cb, especially if the listener cb is not finished yet, so the conn stalls.
// This is a workaround for this error condition, nothing else seems to work.
// @attention Do not try to free the conn here, since the listener cb may not be finished yet, which causes multithreading issues
// XXX: Workaround, should find the real cause: BEV_OPT_DEFER_CALLBACKS?
ctx->protoctx->bev_eventcb(bev, BEV_EVENT_CONNECTED, ctx);
return pxy_bev_eventcb_postexec_logging_and_stats(bev, BEV_EVENT_CONNECTED, ctx);
}
void
pxy_try_disconnect(pxy_conn_ctx_t *ctx, pxy_conn_desc_t *this, pxy_conn_desc_t *other, int is_requestor)
{
// @attention srvdst should never reach here unless in passthrough mode, its bev may be NULL
this->closed = 1;
this->free(this->bev, ctx);
this->bev = NULL;
if (other->closed) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_try_disconnect: other->closed, terminate conn, fd=%d\n", ctx->fd);
#endif /* DEBUG_PROXY */
// Uses only ctx to log disconnect, never any of the bevs
pxy_log_dbg_disconnect(ctx);
pxy_conn_term(ctx, is_requestor);
}
}
void
pxy_try_disconnect_child(pxy_conn_child_ctx_t *ctx, pxy_conn_desc_t *this, pxy_conn_desc_t *other)
{
this->closed = 1;
this->free(this->bev, ctx->conn);
this->bev = NULL;
if (other->closed) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_try_disconnect_child: other->closed, terminate conn, child fd=%d, fd=%d\n", ctx->fd, ctx->conn->fd);
#endif /* DEBUG_PROXY */
// Uses only ctx to log disconnect, never any of the bevs
pxy_log_dbg_disconnect_child(ctx);
pxy_conn_term_child(ctx);
}
}
int
pxy_try_consume_last_input(struct bufferevent *bev, pxy_conn_ctx_t *ctx)
{
/* if there is data pending in the closed connection,
* handle it here, otherwise it will be lost. */
if (evbuffer_get_length(bufferevent_get_input(bev))) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINE, "pxy_try_consume_last_input: evbuffer_get_length(inbuf) > 0, terminate conn, fd=%d\n", ctx->fd);
#endif /* DEBUG_PROXY */
if (pxy_bev_readcb_preexec_logging_and_stats(bev, ctx) == -1) {
return -1;
}
ctx->protoctx->bev_readcb(bev, ctx);
}
return 0;
}
int
pxy_try_consume_last_input_child(struct bufferevent *bev, pxy_conn_child_ctx_t *ctx)
{
/* if there is data pending in the closed connection,
* handle it here, otherwise it will be lost. */
if (evbuffer_get_length(bufferevent_get_input(bev))) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINE, "pxy_try_consume_last_input_child: evbuffer_get_length(inbuf) > 0, terminate conn, child fd=%d, fd=%d\n", ctx->fd, ctx->conn->fd);
#endif /* DEBUG_PROXY */
if (pxy_bev_readcb_preexec_logging_and_stats_child(bev, ctx) == -1) {
return -1;
}
ctx->protoctx->bev_readcb(bev, ctx);
}
return 0;
}
int
pxy_set_dstaddr(pxy_conn_ctx_t *ctx)
{
if (sys_sockaddr_str((struct sockaddr *)&ctx->dstaddr, ctx->dstaddrlen, &ctx->dsthost_str, &ctx->dstport_str) != 0) {
// sys_sockaddr_str() may fail due to either malloc() or getnameinfo()
ctx->enomem = 1;
pxy_conn_term(ctx, 1);
return -1;
}
return 0;
}
int
pxy_bev_readcb_preexec_logging_and_stats(struct bufferevent *bev, pxy_conn_ctx_t *ctx)
{
if (bev == ctx->src.bev || bev == ctx->dst.bev) {
struct evbuffer *inbuf = bufferevent_get_input(bev);
size_t inbuf_size = evbuffer_get_length(inbuf);
if (bev == ctx->src.bev) {
ctx->thr->intif_in_bytes += inbuf_size;
} else {
ctx->thr->intif_out_bytes += inbuf_size;
}
if (WANT_CONTENT_LOG(ctx->conn)) {
// HTTP content logging at this point may record certain header lines twice, if we have not seen all headers yet
return pxy_log_content_inbuf(ctx, inbuf, (bev == ctx->src.bev));
}
}
return 0;
}
/*
* Callback for read events on the up- and downstream connection bufferevents.
* Called when there is data ready in the input evbuffer.
*/
void
pxy_bev_readcb(struct bufferevent *bev, void *arg)
{
pxy_conn_ctx_t *ctx = arg;
if (pxy_bev_readcb_preexec_logging_and_stats(bev, ctx) == -1) {
goto out;
}
if (!ctx->connected) {
log_err_level_printf(LOG_CRIT, "pxy_bev_readcb: readcb called when not connected - aborting.\n");
log_exceptcb();
return;
}
ctx->atime = time(NULL);
ctx->protoctx->bev_readcb(bev, ctx);
out:
if (ctx->term || ctx->enomem) {
pxy_conn_free(ctx, ctx->term ? ctx->term_requestor : (bev == ctx->src.bev));
}
}
int
pxy_bev_readcb_preexec_logging_and_stats_child(struct bufferevent *bev, pxy_conn_child_ctx_t *ctx)
{
struct evbuffer *inbuf = bufferevent_get_input(bev);
size_t inbuf_size = evbuffer_get_length(inbuf);
if (bev == ctx->src.bev) {
ctx->conn->thr->extif_out_bytes += inbuf_size;
} else {
ctx->conn->thr->extif_in_bytes += inbuf_size;
}
if (WANT_CONTENT_LOG(ctx->conn)) {
return pxy_log_content_inbuf(ctx->conn, inbuf, (bev == ctx->src.bev));
}
return 0;
}
void
pxy_bev_readcb_child(struct bufferevent *bev, void *arg)
{
pxy_conn_child_ctx_t *ctx = arg;
if (pxy_bev_readcb_preexec_logging_and_stats_child(bev, ctx) == -1) {
goto out;
}
if (!ctx->connected) {
log_err_level_printf(LOG_CRIT, "pxy_bev_readcb_child: readcb called when not connected - aborting.\n");
log_exceptcb();
return;
}
ctx->conn->atime = time(NULL);
ctx->protoctx->bev_readcb(bev, ctx);
out:
if (ctx->conn->term || ctx->conn->enomem) {
pxy_conn_free(ctx->conn, ctx->conn->term ? ctx->conn->term_requestor : (bev == ctx->src.bev));
return;
}
if (ctx->term) {
pxy_conn_free_child(ctx);
}
}
/*
* Callback for write events on the up- and downstream connection bufferevents.
* Called when either all data from the output evbuffer has been written,
* or if the outbuf is only half full again after having been full.
*/
void
pxy_bev_writecb(struct bufferevent *bev, void *arg)
{
pxy_conn_ctx_t *ctx = arg;
ctx->atime = time(NULL);
ctx->protoctx->bev_writecb(bev, ctx);
if (ctx->term || ctx->enomem) {
pxy_conn_free(ctx, ctx->term ? ctx->term_requestor : (bev == ctx->src.bev));
}
}
void
pxy_bev_writecb_child(struct bufferevent *bev, void *arg)
{
pxy_conn_child_ctx_t *ctx = arg;
ctx->conn->atime = time(NULL);
ctx->protoctx->bev_writecb(bev, ctx);
if (ctx->conn->term || ctx->conn->enomem) {
pxy_conn_free(ctx->conn, ctx->conn->term ? ctx->conn->term_requestor : (bev == ctx->src.bev));
return;
}
if (ctx->term) {
pxy_conn_free_child(ctx);
}
}
int
pxy_bev_eventcb_postexec_logging_and_stats(struct bufferevent *bev, short events, pxy_conn_ctx_t *ctx)
{
if (ctx->term || ctx->enomem) {
return -1;
}
if (events & BEV_EVENT_CONNECTED) {
// Passthrough proto does its own connect logging
if (ctx->proto != PROTO_PASSTHROUGH) {
if (bev == ctx->src.bev) {
// @todo When do we reach here? If proto is autossl? Otherwise, src is connected in acceptcb.
pxy_log_connect_src(ctx);
} else if (ctx->connected) {
if (pxy_prepare_logging(ctx) == -1) {
return -1;
}
// Doesn't log connect if proto is http, http proto does its own connect logging
pxy_log_connect_srvdst(ctx);
}
}
if (bev == ctx->srvdst.bev) {
ctx->thr->max_load = MAX(ctx->thr->max_load, ctx->thr->load);
ctx->thr->max_fd = MAX(ctx->thr->max_fd, ctx->fd);
// src and other fd stats are collected in acceptcb functions
ctx->srvdst_fd = bufferevent_getfd(ctx->srvdst.bev);
ctx->thr->max_fd = MAX(ctx->thr->max_fd, ctx->srvdst_fd);
// Passthrough proto may have a NULL dst.bev
if (ctx->dst.bev) {
ctx->dst_fd = bufferevent_getfd(ctx->dst.bev);
ctx->thr->max_fd = MAX(ctx->thr->max_fd, ctx->dst_fd);
}
}
}
return 0;
}
/*
* Callback for meta events on the up- and downstream connection bufferevents.
* Called when EOF has been reached, a connection has been made, and on errors.
*/
void
pxy_bev_eventcb(struct bufferevent *bev, short events, void *arg)
{
pxy_conn_ctx_t *ctx = arg;
ctx->atime = time(NULL);
if (events & BEV_EVENT_ERROR) {
log_err_printf("Client-side BEV_EVENT_ERROR\n");
ctx->thr->errors++;
}
ctx->protoctx->bev_eventcb(bev, events, arg);
pxy_bev_eventcb_postexec_logging_and_stats(bev, events, ctx);
// Logging functions may set term or enomem too
// EOF eventcb may call readcb possibly causing enomem
if (ctx->term || ctx->enomem) {
pxy_conn_free(ctx, ctx->term ? ctx->term_requestor : (bev == ctx->src.bev));
}
}
void
pxy_bev_eventcb_postexec_stats_child(short events, pxy_conn_child_ctx_t *ctx)
{
if (events & BEV_EVENT_CONNECTED) {
ctx->conn->thr->max_fd = MAX(ctx->conn->thr->max_fd, MAX(bufferevent_getfd(ctx->src.bev), bufferevent_getfd(ctx->dst.bev)));
}
}
void
pxy_bev_eventcb_child(struct bufferevent *bev, short events, void *arg)
{
pxy_conn_child_ctx_t *ctx = arg;
ctx->conn->atime = time(NULL);
if (events & BEV_EVENT_ERROR) {
log_err_printf("Server-side BEV_EVENT_ERROR\n");
ctx->conn->thr->errors++;
}
ctx->protoctx->bev_eventcb(bev, events, arg);
// EOF eventcb may call readcb possibly causing enomem
if (ctx->conn->term || ctx->conn->enomem) {
pxy_conn_free(ctx->conn, ctx->conn->term ? ctx->conn->term_requestor : (bev == ctx->src.bev));
return;
}
if (ctx->term) {
pxy_conn_free_child(ctx);
return;
}
pxy_bev_eventcb_postexec_stats_child(events, ctx);
}
/*
* Complete the connection. This gets called after finding out where to
* connect to.
*/
void
pxy_conn_connect(pxy_conn_ctx_t *ctx)
{
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_conn_connect: ENTER, fd=%d\n", ctx->fd);
#endif /* DEBUG_PROXY */
if (!ctx->dstaddrlen) {
log_err_level_printf(LOG_CRIT, "No target address; aborting connection\n");
evutil_closesocket(ctx->fd);
pxy_conn_ctx_free(ctx, 1);
return;
}
if (OPTS_DEBUG(ctx->global)) {
char *host, *port;
if (sys_sockaddr_str((struct sockaddr *)&ctx->dstaddr, ctx->dstaddrlen, &host, &port) == 0) {
log_dbg_printf("Connecting to [%s]:%s\n", host, port);
free(host);
free(port);
} else {
log_dbg_printf("Connecting to [?]:?\n");
}
}
if (ctx->protoctx->connectcb(ctx) == -1) {
// @attention Do not try to close conns or do anything else with conn ctx on the thrmgr thread after setting event callbacks and/or socket connect.
// The return value of -1 from connectcb indicates that there was a fatal error before event callbacks were set, so we can terminate the connection.
// Otherwise, it is up to the event callbacks to terminate the connection. This is necessary to avoid multithreading issues.
if (ctx->term || ctx->enomem) {
pxy_conn_free(ctx, ctx->term ? ctx->term_requestor : 1);
}
}
// @attention Do not do anything with the conn ctx after this point on the thrmgr thread
}
#if defined(__OpenBSD__) || defined(__linux__)
static void
identify_user(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, "identify_user: ENTER, fd=%d\n", ctx->fd);
#endif /* DEBUG_PROXY */
if (ctx->ev) {
event_free(ctx->ev);
ctx->ev = NULL;
}
if (ctx->identify_user_count++ >= 50) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "identify_user: Cannot get conn user, fd=%d\n", ctx->fd);
#endif /* DEBUG_PROXY */
goto redirect;
} else {
int rc;
// @todo Do we really need to reset the stmt, as we always reset while returning?
sqlite3_reset(ctx->thr->get_user);
sqlite3_bind_text(ctx->thr->get_user, 1, ctx->srchost_str, -1, NULL);
rc = sqlite3_step(ctx->thr->get_user);
// Retry in case we cannot acquire db file or database: SQLITE_BUSY or SQLITE_LOCKED respectively
if (rc == SQLITE_BUSY || rc == SQLITE_LOCKED) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "identify_user: User db busy or locked, retrying, count=%d, fd=%d\n", ctx->identify_user_count, ctx->fd);
#endif /* DEBUG_PROXY */
// Do not forget to reset sqlite stmt, or else the userdb may remain busy/locked
sqlite3_reset(ctx->thr->get_user);
ctx->ev = event_new(ctx->evbase, -1, 0, identify_user, ctx);
if (!ctx->ev)
goto memout;
struct timeval retry_delay = {0, 100};
if (event_add(ctx->ev, &retry_delay) == -1)
goto memout;
return;
} else if (rc == SQLITE_DONE) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "identify_user: Conn has no user, fd=%d\n", ctx->fd);
#endif /* DEBUG_PROXY */
goto redirect;
} else if (rc == SQLITE_ROW) {
char *ether = (char *)sqlite3_column_text(ctx->thr->get_user, 1);
if (strncasecmp(ether, ctx->ether, 17)) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "identify_user: Ethernet addresses do not match, db=%s, arp cache=%s, fd=%d\n", ether, ctx->ether, ctx->fd);
#endif /* DEBUG_PROXY */
goto redirect;
}
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "identify_user: Passed ethernet address test, %s, fd=%d\n", ether, ctx->fd);
#endif /* DEBUG_PROXY */
ctx->idletime = time(NULL) - sqlite3_column_int(ctx->thr->get_user, 2);
if (ctx->idletime > ctx->spec->opts->user_timeout) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "identify_user: User entry timed out, idletime=%u, fd=%d\n", ctx->idletime, ctx->fd);
#endif /* DEBUG_PROXY */
goto redirect;
}
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "identify_user: Passed timeout test, idletime=%u, fd=%d\n", ctx->idletime, ctx->fd);
#endif /* DEBUG_PROXY */
ctx->user = strdup((char *)sqlite3_column_text(ctx->thr->get_user, 0));
// Desc is needed for PassSite filtering
ctx->desc = strdup((char *)sqlite3_column_text(ctx->thr->get_user, 3));
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "identify_user: Conn user=%s, desc=%s, fd=%d\n", ctx->user, ctx->desc, ctx->fd);
#endif /* DEBUG_PROXY */
}
}
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "identify_user: Passed user identification, fd=%d\n", ctx->fd);
#endif /* DEBUG_PROXY */
redirect:
sqlite3_reset(ctx->thr->get_user);
if (ctx->ev) {
event_free(ctx->ev);
ctx->ev = NULL;
}
return;
memout:
log_err_level_printf(LOG_CRIT, "Aborting connection user identification!\n");
pxy_conn_term(ctx, 1);
}
#endif /* __OpenBSD__ || __linux__ */
#ifdef __linux__
// Assume proc filesystem support
#define ARP_CACHE "/proc/net/arp"
/*
* We do not care about multiple matches or expiration status of arp cache entries on Linux.
*/
static int NONNULL(1)
get_client_ether(pxy_conn_ctx_t *ctx)
{
int rv = 0;
FILE *arp_cache = fopen(ARP_CACHE, "r");
if (!arp_cache) {
log_err_level_printf(LOG_CRIT, "Failed to open arp cache: \"" ARP_CACHE "\"\n");
return -1;
}
// Skip the first line, which contains the header
char header[1024];
if (!fgets(header, sizeof(header), arp_cache)) {
log_err_level_printf(LOG_CRIT, "Failed to skip arp cache header\n");
rv = -1;
goto out;
}
char ip[46], ether[18];
//192.168.0.1 0x1 0x2 00:50:56:2c:bf:e0 * enp3s0f1
while (fscanf(arp_cache, "%45s %*s %*s %17s %*s %*s", ip, ether) == 2) {
if (!strncasecmp(ip, ctx->srchost_str, 45)) {
ctx->ether = strdup(ether);
rv = 1;
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "Arp entry for %s: %s\n", ip, ether);
#endif /* DEBUG_PROXY */
goto out;
}
}
out:
fclose(arp_cache);
return rv;
}
#endif /* __linux__ */
#ifdef __OpenBSD__
/*
* This is a modified version of the same function from OpenBSD sources,
* which has a 3-clause BSD license.
*/
static char *
ether_str(struct sockaddr_dl *sdl)
{
char hbuf[NI_MAXHOST];
u_char *cp;
if (sdl->sdl_alen) {
cp = (u_char *)LLADDR(sdl);
snprintf(hbuf, sizeof(hbuf), "%02x:%02x:%02x:%02x:%02x:%02x",
cp[0], cp[1], cp[2], cp[3], cp[4], cp[5]);
return strdup(hbuf);
} else {
return NULL;
}
}
/*
* This is a modified version of a similar function from OpenBSD sources,
* which has a 3-clause BSD license.
*/
static int NONNULL(2)
get_client_ether(in_addr_t addr, pxy_conn_ctx_t *ctx)
{
int mib[7];
size_t needed;
char *lim, *buf = NULL, *next;
struct rt_msghdr *rtm;
struct sockaddr_inarp *sin;
struct sockaddr_dl *sdl;
int found_entry = 0;
int rdomain = getrtable();
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = AF_INET;
mib[4] = NET_RT_FLAGS;
mib[5] = RTF_LLINFO;
mib[6] = rdomain;
while (1) {
if (sysctl(mib, 7, NULL, &needed, NULL, 0) == -1) {
log_err_level_printf(LOG_WARNING, "route-sysctl-estimate\n");
}
if (needed == 0) {
return found_entry;
}
if ((buf = realloc(buf, needed)) == NULL) {
return -1;
}
if (sysctl(mib, 7, buf, &needed, NULL, 0) == -1) {
if (errno == ENOMEM)
continue;
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "actual retrieval of routing table\n");
#endif /* DEBUG_PROXY */
}
lim = buf + needed;
break;
}
int expired = 0;
int incomplete = 0;
for (next = buf; next < lim; next += rtm->rtm_msglen) {
rtm = (struct rt_msghdr *)next;
if (rtm->rtm_version != RTM_VERSION)
continue;
sin = (struct sockaddr_inarp *)(next + rtm->rtm_hdrlen);
sdl = (struct sockaddr_dl *)(sin + 1);
if (addr) {
if (addr != sin->sin_addr.s_addr)
continue;
found_entry++;
}
char *expire = NULL;
if (rtm->rtm_flags & (RTF_PERMANENT_ARP | RTF_LOCAL)) {
expire = "permanent";
} else if (rtm->rtm_rmx.rmx_expire == 0) {
expire = "static";
} else if (rtm->rtm_rmx.rmx_expire > time(NULL)) {
expire = "active";
} else {
expire = "expired";
expired++;
}
char *ether = ether_str(sdl);
if (ether) {
// Record the first unexpired complete entry
if (!ctx->ether && (found_entry - expired) == 1) {
// Dup before assignment because we free local var ether below
ctx->ether = strdup(ether);
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "Arp entry for %s: %s\n", inet_ntoa(sin->sin_addr), ether);
#endif /* DEBUG_PROXY */
// Do not care about multiple matches, return immediately
free(ether);
goto out;
}
} else {
incomplete++;
}
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "Arp entry %u for %s: %s (%s)\n", found_entry, inet_ntoa(sin->sin_addr), ether ? ether : "incomplete", expire);
#endif /* DEBUG_PROXY */
if (ether) {
free(ether);
}
}
out:
free(buf);
return found_entry - expired - incomplete;
}
#endif /* __OpenBSD__ */
int
pxy_userauth(pxy_conn_ctx_t *ctx)
{
if (ctx->spec->opts->user_auth && !ctx->user) {
#if defined(__OpenBSD__) || defined(__linux__)
int ec;
#if defined(__OpenBSD__)
ec = get_client_ether(((struct sockaddr_in *)&ctx->srcaddr)->sin_addr.s_addr, ctx);
#else /* __linux__ */
ec = get_client_ether(ctx);
#endif /* __linux__ */
if (ec == 1) {
identify_user(-1, 0, ctx);
return 0;
} else if (ec == 0) {
log_err_level_printf(LOG_CRIT, "Cannot find ethernet address of client IP address\n");
} else if (ec > 1) {
// get_client_ether() does not return multiple matches, but keep this in case a future version does
log_err_level_printf(LOG_CRIT, "Multiple ethernet addresses for the same client IP address\n");
} else {
// ec == -1
log_err_level_printf(LOG_CRIT, "Aborting connection setup (out of memory)!\n");
}
#endif /* __OpenBSD__ || __linux__ */
log_err_level_printf(LOG_CRIT, "Aborting connection setup (user auth)!\n");
pxy_conn_term(ctx, 1);
return -1;
}
return 0;
}
/*
* Callback for accept events on the socket listener bufferevent.
* Called when a new incoming connection has been accepted.
* Initiates the connection to the server. The incoming connection
* from the client is not being activated until we have a successful
* connection to the server, because we need the server's certificate
* in order to set up the SSL session to the client.
* For consistency, plain TCP works the same way, even if we could
* start reading from the client while waiting on the connection to
* the server to connect.
*/
void
pxy_conn_setup(evutil_socket_t fd,
struct sockaddr *peeraddr, int peeraddrlen,
pxy_thrmgr_ctx_t *thrmgr,
proxyspec_t *spec, global_t *global,
evutil_socket_t clisock)
{
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_conn_setup: ENTER, fd=%d\n", fd);
char *host, *port;
if (sys_sockaddr_str(peeraddr, peeraddrlen, &host, &port) == 0) {
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_conn_setup: peer addr=[%s]:%s, fd=%d\n", host, port, fd);
free(host);
free(port);
}
#endif /* DEBUG_PROXY */
if (check_fd_usage(
#ifdef DEBUG_PROXY
fd
#endif /* DEBUG_PROXY */
) == -1) {
evutil_closesocket(fd);
return;
}
/* create per connection state and attach to thread */
pxy_conn_ctx_t *ctx = pxy_conn_ctx_new(fd, thrmgr, spec, global, clisock);
if (!ctx) {
log_err_level_printf(LOG_CRIT, "Error allocating memory\n");
evutil_closesocket(fd);
return;
}
ctx->af = peeraddr->sa_family;
/* determine original destination of connection */
if (spec->natlookup) {
/* NAT engine lookup */
ctx->dstaddrlen = sizeof(struct sockaddr_storage);
if (spec->natlookup((struct sockaddr *)&ctx->dstaddr, &ctx->dstaddrlen, fd, peeraddr, peeraddrlen) == -1) {
log_err_printf("Connection not found in NAT state table, aborting connection\n");
goto out;
}
} else if (spec->connect_addrlen > 0) {
/* static forwarding */
ctx->dstaddrlen = spec->connect_addrlen;
memcpy(&ctx->dstaddr, &spec->connect_addr, ctx->dstaddrlen);
} else {
/* SNI mode */
if (!ctx->spec->ssl) {
/* if this happens, the proxyspec parser is broken */
log_err_printf("SNI mode used for non-SSL connection; aborting connection\n");
goto out;
}
}
if (sys_sockaddr_str(peeraddr, peeraddrlen, &ctx->srchost_str, &ctx->srcport_str) != 0) {
log_err_level_printf(LOG_CRIT, "Aborting connection setup (out of memory)!\n");
goto out;
}
/* prepare logging part 1 and user auth */
if (global->pcaplog || spec->opts->user_auth
#ifndef WITHOUT_MIRROR
|| global->mirrorif
#endif /* !WITHOUT_MIRROR */
#ifdef HAVE_LOCAL_PROCINFO
|| global->lprocinfo
#endif /* HAVE_LOCAL_PROCINFO */
) {
ctx->srcaddrlen = peeraddrlen;
memcpy(&ctx->srcaddr, peeraddr, ctx->srcaddrlen);
}
ctx->protoctx->fd_readcb(ctx->fd, 0, ctx);
return;
out:
evutil_closesocket(fd);
pxy_conn_ctx_free(ctx, 1);
}
/* vim: set noet ft=c: */
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