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pxyconn.c
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pxyconn.c
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/*-
* SSLsplit - transparent SSL/TLS interception
* https://www.roe.ch/SSLsplit
*
* Copyright (c) 2009-2018, Daniel Roethlisberger <daniel@roe.ch>.
* 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 "privsep.h"
#include "pxysslshut.h"
#include "cachemgr.h"
#include "ssl.h"
#include "opts.h"
#include "sys.h"
#include "util.h"
#include "base64.h"
#include "url.h"
#include "log.h"
#include "attrib.h"
#include "proc.h"
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <event2/event.h>
#include <event2/listener.h>
#include <event2/bufferevent.h>
#include <event2/bufferevent_ssl.h>
#include <event2/buffer.h>
#include <event2/thread.h>
#include <event2/dns.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <assert.h>
#include <sys/param.h>
#ifdef HAVE_NETFILTER
#include <glob.h>
#endif /* HAVE_NETFILTER */
/*
* Maximum size of data to buffer per connection direction before
* temporarily stopping to read data from the other end.
*/
#define OUTBUF_LIMIT (128*1024)
/*
* Context used for all server sessions.
*/
#ifdef USE_SSL_SESSION_ID_CONTEXT
static unsigned long ssl_session_context = 0x31415926;
#endif /* USE_SSL_SESSION_ID_CONTEXT */
/*
* Proxy connection context state, describes a proxy connection
* with source and destination socket bufferevents, SSL context and
* other session state. One of these exists per handled proxy
* connection.
*/
#ifdef HAVE_LOCAL_PROCINFO
/* local process data - filled in iff pid != -1 */
typedef struct pxy_conn_lproc_desc {
struct sockaddr_storage srcaddr;
socklen_t srcaddrlen;
pid_t pid;
uid_t uid;
gid_t gid;
/* derived log strings */
char *exec_path;
char *user;
char *group;
} pxy_conn_lproc_desc_t;
#endif /* HAVE_LOCAL_PROCINFO */
#define WANT_CONNECT_LOG(ctx) ((ctx)->opts->connectlog||!(ctx)->opts->detach)
#define WANT_CONTENT_LOG(ctx) ((ctx)->opts->contentlog&&!(ctx)->passthrough)
#define SSLPROXY_KEY "SSLproxy:"
#define SSLPROXY_KEY_LEN strlen(SSLPROXY_KEY)
int descriptor_table_size = 0;
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, opts_t *opts,
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) {
log_err_level_printf(LOG_CRIT, "Error allocating memory\n");
evutil_closesocket(fd);
return NULL;
}
memset(ctx, 0, sizeof(pxy_conn_ctx_t));
ctx->id = thrmgr->conn_count++;
#if defined (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->fd = fd;
ctx->thrmgr = thrmgr;
ctx->spec = spec;
ctx->opts = opts;
ctx->clisock = clisock;
ctx->clienthello_search = ctx->spec->upgrade;
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 */
#ifdef DEBUG_PROXY
if (OPTS_DEBUG(ctx->opts)) {
log_dbg_printf("%p pxy_conn_ctx_new\n", (void*)ctx);
}
#endif /* DEBUG_PROXY */
return ctx;
}
static pxy_conn_child_ctx_t * MALLOC NONNULL(2)
pxy_conn_ctx_new_child(evutil_socket_t fd, pxy_conn_ctx_t *parent)
{
assert(parent != NULL);
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_conn_ctx_new_child: ENTER fd=%d\n", 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->fd = fd;
ctx->parent = parent;
// @attention Child ctxs use the parent's event bases, otherwise we would get multithreading issues
pxy_thrmgr_attach_child(parent);
#ifdef DEBUG_PROXY
if (OPTS_DEBUG(parent->opts)) {
log_dbg_printf("%p pxy_conn_ctx_new_child\n", (void*)ctx);
}
#endif /* DEBUG_PROXY */
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 fd=%d, pfd=%d\n", ctx->fd, ctx->parent->fd);
if (OPTS_DEBUG(ctx->parent->opts)) {
log_dbg_printf("%p pxy_conn_ctx_free_child\n",
(void*)ctx);
}
#endif /* DEBUG_PROXY */
pxy_thrmgr_detach_child(ctx->parent);
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);
}
if (ctx->ssl_names) {
free(ctx->ssl_names);
}
if (ctx->origcrtfpr) {
free(ctx->origcrtfpr);
}
if (ctx->usedcrtfpr) {
free(ctx->usedcrtfpr);
}
free(ctx);
}
/*
* Free bufferenvent and close underlying socket properly.
* For OpenSSL bufferevents, this will shutdown the SSL connection.
*/
static void
bufferevent_free_and_close_fd(struct bufferevent *bev, pxy_conn_ctx_t *ctx)
{
evutil_socket_t fd = bufferevent_getfd(bev);
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINER, "bufferevent_free_and_close_fd: ENTER i:%zu o:%zu, fd=%d\n",
evbuffer_get_length(bufferevent_get_input(bev)), evbuffer_get_length(bufferevent_get_output(bev)), fd);
#endif /* DEBUG_PROXY */
SSL *ssl = NULL;
if ((ctx->spec->ssl || ctx->clienthello_found) && !ctx->passthrough) {
ssl = bufferevent_openssl_get_ssl(bev); /* does not inc refc */
}
#ifdef DEBUG_PROXY
if (OPTS_DEBUG(ctx->opts)) {
log_dbg_printf(" %p bufferevent_free_and_close_fd fd=%d\n",
(void*)bev, fd);
}
#endif /* DEBUG_PROXY */
// @todo Check if we need to NULL all cbs?
// @see https://stackoverflow.com/questions/31688709/knowing-all-callbacks-have-run-with-libevent-and-bufferevent-free
//bufferevent_setcb(bev, NULL, NULL, NULL, NULL);
bufferevent_free(bev); /* does not free SSL unless the option
BEV_OPT_CLOSE_ON_FREE was set */
if (ssl) {
pxy_ssl_shutdown(ctx->opts, ctx->evbase, ssl, fd);
} else {
if (evutil_closesocket(fd) == -1) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINE, "bufferevent_free_and_close_fd: evutil_closesocket FAILED, fd=%d\n", fd);
#endif /* DEBUG_PROXY */
}
}
}
/*
* Free bufferenvent and close underlying socket properly.
* This is for non-OpenSSL bufferevents.
*/
static void
bufferevent_free_and_close_fd_nonssl(struct bufferevent *bev, UNUSED pxy_conn_ctx_t *ctx)
{
evutil_socket_t fd = bufferevent_getfd(bev);
#ifdef DEBUG_PROXY
if (OPTS_DEBUG(ctx->opts)) {
log_dbg_printf(" %p bufferevent_free_and_close_fd_nonssl fd=%d\n",
(void*)bev, fd);
}
#endif /* DEBUG_PROXY */
bufferevent_free(bev);
if (evutil_closesocket(fd) == -1) {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINE, "bufferevent_free_and_close_fd_nonssl: evutil_closesocket FAILED, fd=%d\n", fd);
#endif /* DEBUG_PROXY */
}
}
static void NONNULL(1,2)
pxy_conn_remove_child(pxy_conn_child_ctx_t *child, pxy_conn_child_ctx_t **head)
{
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_conn_remove_child: ENTER fd=%d\n", child->fd);
#endif /* DEBUG_PROXY */
if (child->fd == (*head)->fd) {
*head = (*head)->next;
return;
}
pxy_conn_child_ctx_t *current = (*head)->next;
pxy_conn_child_ctx_t *previous = *head;
while (current != NULL && previous != NULL) {
if (child->fd == current->fd) {
previous->next = current->next;
return;
}
previous = current;
current = current->next;
}
return;
}
static void NONNULL(1)
pxy_conn_free_child(pxy_conn_child_ctx_t *ctx)
{
assert(ctx->parent != NULL);
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINEST, "pxy_conn_free_child: ENTER fd=%d\n", ctx->fd);
#endif /* DEBUG_PROXY */
pxy_conn_ctx_t *parent = ctx->parent;
pxy_conn_desc_t *dst = &ctx->dst;
if (dst->bev) {
bufferevent_free_and_close_fd(dst->bev, ctx->parent);
dst->bev = NULL;
}
pxy_conn_desc_t *src = &ctx->src;
if (src->bev) {
bufferevent_free_and_close_fd_nonssl(src->bev, ctx->parent);
src->bev = NULL;
}
pxy_conn_remove_child(ctx, &parent->children);
pxy_conn_ctx_free_child(ctx);
}
static void NONNULL(1)
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);
if (OPTS_DEBUG(ctx->opts)) {
log_dbg_printf("%p pxy_conn_ctx_free\n",
(void*)ctx);
}
#endif /* DEBUG_PROXY */
if (WANT_CONTENT_LOG(ctx) && ctx->logctx) {
if (log_content_close(&ctx->logctx, by_requestor) == -1) {
log_err_level_printf(LOG_WARNING, "Content log close failed\n");
}
}
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);
}
if (ctx->http_method) {
free(ctx->http_method);
}
if (ctx->http_uri) {
free(ctx->http_uri);
}
if (ctx->http_host) {
free(ctx->http_host);
}
if (ctx->http_content_type) {
free(ctx->http_content_type);
}
if (ctx->http_status_code) {
free(ctx->http_status_code);
}
if (ctx->http_status_text) {
free(ctx->http_status_text);
}
if (ctx->http_content_length) {
free(ctx->http_content_length);
}
if (ctx->ssl_names) {
free(ctx->ssl_names);
}
if (ctx->origcrtfpr) {
free(ctx->origcrtfpr);
}
if (ctx->usedcrtfpr) {
free(ctx->usedcrtfpr);
}
#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->origcrt) {
X509_free(ctx->origcrt);
}
if (ctx->ev) {
event_free(ctx->ev);
}
if (ctx->sni) {
free(ctx->sni);
}
if (ctx->header_str) {
free(ctx->header_str);
}
if (ctx->srv_dst_ssl_version) {
free(ctx->srv_dst_ssl_version);
}
if (ctx->srv_dst_ssl_cipher) {
free(ctx->srv_dst_ssl_cipher);
}
free(ctx);
}
void NONNULL(1)
pxy_conn_free(pxy_conn_ctx_t *ctx, int by_requestor)
{
evutil_socket_t fd = ctx->fd;
#ifdef DEBUG_PROXY
evutil_socket_t child_fd = ctx->child_fd;
log_dbg_level_printf(LOG_DBG_MODE_FINER, "pxy_conn_free: ENTER fd=%d, child_fd=%d\n", fd, child_fd);
#endif /* DEBUG_PROXY */
pxy_conn_desc_t *src = &ctx->src;
if (!src->closed) {
if (src->bev) {
bufferevent_free_and_close_fd(src->bev, ctx);
src->bev = NULL;
} else {
#ifdef DEBUG_PROXY
log_dbg_level_printf(LOG_DBG_MODE_FINE, "pxy_conn_free: evutil_closesocket on NULL src->bev, fd=%d\n", fd);
#endif /* DEBUG_PROXY */
// @todo src fd may be open, although src.bev is NULL, where do we close the src fd?
evutil_closesocket(fd);
}
}
pxy_conn_desc_t *srv_dst = &ctx->srv_dst;
if (srv_dst->bev) {
bufferevent_free_and_close_fd(srv_dst->bev, ctx);
srv_dst->bev = NULL;
}
pxy_conn_desc_t *dst = &ctx->dst;
if (dst->bev) {
bufferevent_free_and_close_fd_nonssl(dst->bev, ctx);
dst->bev = NULL;
}
// @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_FINE, "pxy_conn_free: Freeing child_evcl, pfd=%d, child_fd=%d, cfd=%d\n",
ctx->fd, ctx->child_fd, ctx->children ? ctx->children->fd : -1);
#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;
}
pxy_conn_ctx_free(ctx, by_requestor);
}
/* forward declaration of libevent callbacks */
static void pxy_bev_readcb(struct bufferevent *, void *);
static void pxy_bev_writecb(struct bufferevent *, void *);
static void pxy_bev_eventcb(struct bufferevent *, short, void *);
static void pxy_fd_readcb(evutil_socket_t, short, void *);
static void pxy_bev_readcb_child(struct bufferevent *, void *);
static void pxy_bev_writecb_child(struct bufferevent *, void *);
static void pxy_bev_eventcb_child(struct bufferevent *, short, void *);
/* forward declaration of OpenSSL callbacks */
#ifndef OPENSSL_NO_TLSEXT
static int pxy_ossl_servername_cb(SSL *ssl, int *al, void *arg);
#endif /* !OPENSSL_NO_TLSEXT */
static int pxy_ossl_sessnew_cb(SSL *, SSL_SESSION *);
static void pxy_ossl_sessremove_cb(SSL_CTX *, SSL_SESSION *);
#if (OPENSSL_VERSION_NUMBER < 0x10100000L) || defined(LIBRESSL_VERSION_NUMBER)
static SSL_SESSION * pxy_ossl_sessget_cb(SSL *, unsigned char *, int, int *);
#else /* OPENSSL_VERSION_NUMBER >= 0x10100000L */
static SSL_SESSION * pxy_ossl_sessget_cb(SSL *, const unsigned char *, int, int *);
#endif /* OPENSSL_VERSION_NUMBER >= 0x10100000L */
/*
* Dump information on a certificate to the debug log.
*/
static void
pxy_debug_crt(X509 *crt)
{
char *sj = ssl_x509_subject(crt);
if (sj) {
log_dbg_printf("Subject DN: %s\n", sj);
free(sj);
}
char *names = ssl_x509_names_to_str(crt);
if (names) {
log_dbg_printf("Common Names: %s\n", names);
free(names);
}
char *fpr;
if (!(fpr = ssl_x509_fingerprint(crt, 1))) {
log_err_level_printf(LOG_WARNING, "Error generating X509 fingerprint\n");
} else {
log_dbg_printf("Fingerprint: %s\n", fpr);
free(fpr);
}
#ifdef DEBUG_CERTIFICATE
/* dump certificate */
log_dbg_print_free(ssl_x509_to_str(crt));
log_dbg_print_free(ssl_x509_to_pem(crt));
#endif /* DEBUG_CERTIFICATE */
}
static 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->opts->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 */
"\n",
ctx->passthrough ? "passthrough" : (ctx->spec->pop3 ? "pop3" : (ctx->spec->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 */
);
} 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 */
"\n",
ctx->clienthello_found ? "upgrade" : (ctx->spec->pop3 ? "pop3s" : (ctx->spec->smtp ? "smtps" : "ssl")),
STRORDASH(ctx->srchost_str),
STRORDASH(ctx->srcport_str),
STRORDASH(ctx->dsthost_str),
STRORDASH(ctx->dstport_str),
STRORDASH(ctx->sni),
STRORDASH(ctx->ssl_names),
SSL_get_version(ctx->src.ssl),
SSL_get_cipher(ctx->src.ssl),
!ctx->srv_dst.closed ? SSL_get_version(ctx->srv_dst.ssl):ctx->srv_dst_ssl_version,
!ctx->srv_dst.closed ? SSL_get_cipher(ctx->srv_dst.ssl):ctx->srv_dst_ssl_cipher,
STRORDASH(ctx->origcrtfpr),
STRORDASH(ctx->usedcrtfpr)
#ifdef HAVE_LOCAL_PROCINFO
, lpi
#endif /* HAVE_LOCAL_PROCINFO */
);
}
if ((rv < 0) || !msg) {
ctx->enomem = 1;
goto out;
}
if (!ctx->opts->detach) {
log_err_printf("%s", msg);
} else if (ctx->opts->statslog) {
if (log_conn(msg) == -1) {
log_err_level_printf(LOG_WARNING, "Conn logging failed\n");
}
}
if (ctx->opts->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->opts->lprocinfo) {
free(lpi);
}
#endif /* HAVE_LOCAL_PROCINFO */
return;
}
static void
pxy_log_connect_http(pxy_conn_ctx_t *ctx)
{
char *msg;
#ifdef HAVE_LOCAL_PROCINFO
char *lpi = NULL;
#endif /* HAVE_LOCAL_PROCINFO */
int rv;
#ifdef DEBUG_PROXY
if (ctx->passthrough) {
log_err_level_printf(LOG_WARNING, "pxy_log_connect_http called while in "
"passthrough mode\n");
return;
}
#endif
#ifdef HAVE_LOCAL_PROCINFO
if (ctx->opts->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;
}
}
#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->spec->ssl) {
rv = asprintf(&msg, "CONN: http %s %s %s %s %s %s %s %s %s"
#ifdef HAVE_LOCAL_PROCINFO
" %s"
#endif /* HAVE_LOCAL_PROCINFO */
"%s\n",
STRORDASH(ctx->srchost_str),
STRORDASH(ctx->srcport_str),
STRORDASH(ctx->dsthost_str),
STRORDASH(ctx->dstport_str),
STRORDASH(ctx->http_host),
STRORDASH(ctx->http_method),
STRORDASH(ctx->http_uri),
STRORDASH(ctx->http_status_code),
STRORDASH(ctx->http_content_length),
#ifdef HAVE_LOCAL_PROCINFO
lpi,
#endif /* HAVE_LOCAL_PROCINFO */
ctx->ocsp_denied ? " ocsp:denied" : "");
} else {
rv = asprintf(&msg, "CONN: https %s %s %s %s %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 */
"%s\n",
STRORDASH(ctx->srchost_str),
STRORDASH(ctx->srcport_str),
STRORDASH(ctx->dsthost_str),
STRORDASH(ctx->dstport_str),
STRORDASH(ctx->http_host),
STRORDASH(ctx->http_method),
STRORDASH(ctx->http_uri),
STRORDASH(ctx->http_status_code),
STRORDASH(ctx->http_content_length),
STRORDASH(ctx->sni),
STRORDASH(ctx->ssl_names),
SSL_get_version(ctx->src.ssl),
SSL_get_cipher(ctx->src.ssl),
!ctx->srv_dst.closed ? SSL_get_version(ctx->srv_dst.ssl):ctx->srv_dst_ssl_version,
!ctx->srv_dst.closed ? SSL_get_cipher(ctx->srv_dst.ssl):ctx->srv_dst_ssl_cipher,
STRORDASH(ctx->origcrtfpr),
STRORDASH(ctx->usedcrtfpr),
#ifdef HAVE_LOCAL_PROCINFO
lpi,
#endif /* HAVE_LOCAL_PROCINFO */
ctx->ocsp_denied ? " ocsp:denied" : "");
}
if ((rv < 0 ) || !msg) {
ctx->enomem = 1;
goto out;
}
if (!ctx->opts->detach) {
log_err_printf("%s", msg);
} else if (ctx->opts->statslog) {
if (log_conn(msg) == -1) {
log_err_level_printf(LOG_WARNING, "Conn logging failed\n");
}
}
if (ctx->opts->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) {
free(lpi);
}
#endif /* HAVE_LOCAL_PROCINFO */
return;
}
/*
* Called by OpenSSL when a new src SSL session is created.
* OpenSSL increments the refcount before calling the callback and will
* decrement it again if we return 0. Returning 1 will make OpenSSL skip
* the refcount decrementing. In other words, return 0 if we did not
* keep a pointer to the object (which we never do here).
*/
#ifdef HAVE_SSLV2
#define MAYBE_UNUSED
#else /* !HAVE_SSLV2 */
#define MAYBE_UNUSED UNUSED
#endif /* !HAVE_SSLV2 */
static int
pxy_ossl_sessnew_cb(MAYBE_UNUSED SSL *ssl, SSL_SESSION *sess)
#undef MAYBE_UNUSED
{
#ifdef DEBUG_SESSION_CACHE
log_dbg_printf("===> OpenSSL new session callback:\n");
if (sess) {
log_dbg_print_free(ssl_session_to_str(sess));
} else {
log_dbg_printf("(null)\n");
}
#endif /* DEBUG_SESSION_CACHE */
#ifdef HAVE_SSLV2
/* Session resumption seems to fail for SSLv2 with protocol
* parsing errors, so we disable caching for SSLv2. */
if (SSL_version(ssl) == SSL2_VERSION) {
log_err_level_printf(LOG_WARNING, "Session resumption denied to SSLv2"
"client.\n");
return 0;
}
#endif /* HAVE_SSLV2 */
if (sess) {
cachemgr_ssess_set(sess);
}
return 0;
}
/*
* Called by OpenSSL when a src SSL session should be removed.
* OpenSSL calls SSL_SESSION_free() after calling the callback;
* we do not need to free the reference here.
*/
static void
pxy_ossl_sessremove_cb(UNUSED SSL_CTX *sslctx, SSL_SESSION *sess)
{
#ifdef DEBUG_SESSION_CACHE
log_dbg_printf("===> OpenSSL remove session callback:\n");
if (sess) {
log_dbg_print_free(ssl_session_to_str(sess));
} else {
log_dbg_printf("(null)\n");
}
#endif /* DEBUG_SESSION_CACHE */
if (sess) {
cachemgr_ssess_del(sess);
}
}
/*
* Called by OpenSSL when a src SSL session is requested by the client.
*/
static SSL_SESSION *
#if (OPENSSL_VERSION_NUMBER < 0x10100000L) || defined(LIBRESSL_VERSION_NUMBER)
pxy_ossl_sessget_cb(UNUSED SSL *ssl, unsigned char *id, int idlen, int *copy)
#else /* OPENSSL_VERSION_NUMBER >= 0x10100000L */
pxy_ossl_sessget_cb(UNUSED SSL *ssl, const unsigned char *id, int idlen, int *copy)
#endif /* OPENSSL_VERSION_NUMBER >= 0x10100000L */
{
SSL_SESSION *sess;
#ifdef DEBUG_SESSION_CACHE
log_dbg_printf("===> OpenSSL get session callback:\n");
#endif /* DEBUG_SESSION_CACHE */
*copy = 0; /* SSL should not increment reference count of session */
sess = cachemgr_ssess_get(id, idlen);
#ifdef DEBUG_SESSION_CACHE
if (sess) {
log_dbg_print_free(ssl_session_to_str(sess));
}
#endif /* DEBUG_SESSION_CACHE */
log_dbg_printf("SSL session cache: %s\n", sess ? "HIT" : "MISS");
return sess;
}
/*
* Set SSL_CTX options that are the same for incoming and outgoing SSL_CTX.
*/
static void
pxy_sslctx_setoptions(SSL_CTX *sslctx, pxy_conn_ctx_t *ctx)
{
SSL_CTX_set_options(sslctx, SSL_OP_ALL);
#ifdef SSL_OP_TLS_ROLLBACK_BUG
SSL_CTX_set_options(sslctx, SSL_OP_TLS_ROLLBACK_BUG);
#endif /* SSL_OP_TLS_ROLLBACK_BUG */
#ifdef SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION
SSL_CTX_set_options(sslctx, SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION);
#endif /* SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION */
#ifdef SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS
SSL_CTX_set_options(sslctx, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS);
#endif /* SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS */
#ifdef SSL_OP_NO_TICKET
SSL_CTX_set_options(sslctx, SSL_OP_NO_TICKET);
#endif /* SSL_OP_NO_TICKET */
#ifdef SSL_OP_NO_SSLv2
#ifdef HAVE_SSLV2
if (ctx->opts->no_ssl2) {
#endif /* HAVE_SSLV2 */
SSL_CTX_set_options(sslctx, SSL_OP_NO_SSLv2);
#ifdef HAVE_SSLV2
}
#endif /* HAVE_SSLV2 */
#endif /* !SSL_OP_NO_SSLv2 */
#ifdef HAVE_SSLV3
if (ctx->opts->no_ssl3) {
SSL_CTX_set_options(sslctx, SSL_OP_NO_SSLv3);
}
#endif /* HAVE_SSLV3 */
#ifdef HAVE_TLSV10
if (ctx->opts->no_tls10) {
SSL_CTX_set_options(sslctx, SSL_OP_NO_TLSv1);
}
#endif /* HAVE_TLSV10 */
#ifdef HAVE_TLSV11
if (ctx->opts->no_tls11) {
SSL_CTX_set_options(sslctx, SSL_OP_NO_TLSv1_1);
}
#endif /* HAVE_TLSV11 */
#ifdef HAVE_TLSV12
if (ctx->opts->no_tls12) {
SSL_CTX_set_options(sslctx, SSL_OP_NO_TLSv1_2);
}
#endif /* HAVE_TLSV12 */
#ifdef SSL_OP_NO_COMPRESSION
if (!ctx->opts->sslcomp) {
SSL_CTX_set_options(sslctx, SSL_OP_NO_COMPRESSION);
}
#endif /* SSL_OP_NO_COMPRESSION */
SSL_CTX_set_cipher_list(sslctx, ctx->opts->ciphers);
}
/*
* Create and set up a new SSL_CTX instance for terminating SSL.
* Set up all the necessary callbacks, the certificate, the cert chain and key.
*/
static SSL_CTX *
pxy_srcsslctx_create(pxy_conn_ctx_t *ctx, X509 *crt, STACK_OF(X509) *chain,
EVP_PKEY *key)
{
SSL_CTX *sslctx = SSL_CTX_new(ctx->opts->sslmethod());
if (!sslctx)
return NULL;
pxy_sslctx_setoptions(sslctx, ctx);
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
if (ctx->opts->sslversion) {
if (SSL_CTX_set_min_proto_version(sslctx, ctx->opts->sslversion) == 0 ||
SSL_CTX_set_max_proto_version(sslctx, ctx->opts->sslversion) == 0) {
SSL_CTX_free(sslctx);
return NULL;
}
}
#endif /* OPENSSL_VERSION_NUMBER >= 0x10100000L */
SSL_CTX_sess_set_new_cb(sslctx, pxy_ossl_sessnew_cb);
SSL_CTX_sess_set_remove_cb(sslctx, pxy_ossl_sessremove_cb);
SSL_CTX_sess_set_get_cb(sslctx, pxy_ossl_sessget_cb);
SSL_CTX_set_session_cache_mode(sslctx, SSL_SESS_CACHE_SERVER |
SSL_SESS_CACHE_NO_INTERNAL);
#ifdef USE_SSL_SESSION_ID_CONTEXT
SSL_CTX_set_session_id_context(sslctx, (void *)(&ssl_session_context),
sizeof(ssl_session_context));
#endif /* USE_SSL_SESSION_ID_CONTEXT */
#ifndef OPENSSL_NO_TLSEXT
SSL_CTX_set_tlsext_servername_callback(sslctx, pxy_ossl_servername_cb);
SSL_CTX_set_tlsext_servername_arg(sslctx, ctx);
#endif /* !OPENSSL_NO_TLSEXT */
#ifndef OPENSSL_NO_DH
if (ctx->opts->dh) {
SSL_CTX_set_tmp_dh(sslctx, ctx->opts->dh);
} else {
SSL_CTX_set_tmp_dh_callback(sslctx, ssl_tmp_dh_callback);
}
#endif /* !OPENSSL_NO_DH */
#ifndef OPENSSL_NO_ECDH
if (ctx->opts->ecdhcurve) {
EC_KEY *ecdh = ssl_ec_by_name(ctx->opts->ecdhcurve);
SSL_CTX_set_tmp_ecdh(sslctx, ecdh);
EC_KEY_free(ecdh);
} else {
EC_KEY *ecdh = ssl_ec_by_name(NULL);
SSL_CTX_set_tmp_ecdh(sslctx, ecdh);
EC_KEY_free(ecdh);
}
#endif /* !OPENSSL_NO_ECDH */
SSL_CTX_use_certificate(sslctx, crt);
SSL_CTX_use_PrivateKey(sslctx, key);
for (int i = 0; i < sk_X509_num(chain); i++) {
X509 *c = sk_X509_value(chain, i);
ssl_x509_refcount_inc(c); /* next call consumes a reference */
SSL_CTX_add_extra_chain_cert(sslctx, c);
}
#ifdef DEBUG_SESSION_CACHE
if (OPTS_DEBUG(ctx->opts)) {
int mode = SSL_CTX_get_session_cache_mode(sslctx);
log_dbg_printf("SSL session cache mode: %08x\n", mode);
if (mode == SSL_SESS_CACHE_OFF)
log_dbg_printf("SSL_SESS_CACHE_OFF\n");
if (mode & SSL_SESS_CACHE_CLIENT)
log_dbg_printf("SSL_SESS_CACHE_CLIENT\n");
if (mode & SSL_SESS_CACHE_SERVER)
log_dbg_printf("SSL_SESS_CACHE_SERVER\n");
if (mode & SSL_SESS_CACHE_NO_AUTO_CLEAR)
log_dbg_printf("SSL_SESS_CACHE_NO_AUTO_CLEAR\n");
if (mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)
log_dbg_printf("SSL_SESS_CACHE_NO_INTERNAL_LOOKUP\n");
if (mode & SSL_SESS_CACHE_NO_INTERNAL_STORE)
log_dbg_printf("SSL_SESS_CACHE_NO_INTERNAL_STORE\n");
}
#endif /* DEBUG_SESSION_CACHE */
return sslctx;
}
static int
pxy_srccert_write_to_gendir(pxy_conn_ctx_t *ctx, X509 *crt, int is_orig)
{
char *fn;
int rv;