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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>.
* 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 "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 <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>
/*
* libevent compatibility
*/
#if LIBEVENT_VERSION_NUMBER < 0x02010000
static void
bufferevent_openssl_set_allow_dirty_shutdown(UNUSED struct bufferevent *bev,
UNUSED int allow_dirty_shutdown)
{
return;
}
#endif /* LIBEVENT_VERSION_NUMBER < 0x02010000 */
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
#define ERR_GET_FUNC(x) 0
#define ERR_func_error_string(x) ""
#endif
/*
* Maximum size of data to buffer per connection direction before
* temporarily stopping to read data from the other end.
*/
#define OUTBUF_LIMIT (128*1024)
/*
* Print helper for logging code.
*/
#define STRORDASH(x) (((x)&&*(x))?(x):"-")
/*
* 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.
*/
/* single dst or src socket bufferevent descriptor */
typedef struct pxy_conn_desc {
struct bufferevent *bev;
SSL *ssl;
unsigned int closed : 1;
} pxy_conn_desc_t;
#ifdef HAVE_LOCAL_PROCINFO
/* local process data - filled in iff pid != -1 */
typedef struct pxy_conn_lproc_desc {
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 */
/* actual proxy connection state consisting of two connection descriptors,
* connection-wide state and the specs and options */
typedef struct pxy_conn_ctx {
/* per-connection state */
struct pxy_conn_desc src;
struct pxy_conn_desc dst;
/* status flags */
unsigned int connected : 1; /* 0 until both ends are connected */
unsigned int enomem : 1; /* 1 if out of memory */
/* ssl */
unsigned int sni_peek_retries : 6; /* max 64 SNI parse retries */
unsigned int immutable_cert : 1; /* 1 if the cert cannot be changed */
unsigned int generated_cert : 1; /* 1 if we generated a new cert */
unsigned int passthrough : 1; /* 1 if SSL passthrough is active */
/* http */
unsigned int seen_req_header : 1; /* 0 until request header complete */
unsigned int seen_resp_header : 1; /* 0 until response hdr complete */
unsigned int sent_http_conn_close : 1; /* 0 until Conn: close sent */
unsigned int ocsp_denied : 1; /* 1 if OCSP was denied */
/* autossl */
unsigned int clienthello_search : 1; /* 1 if waiting for hello */
unsigned int clienthello_found : 1; /* 1 if conn upgrade to SSL */
/* server name indicated by client in SNI TLS extension */
char *sni;
/* log strings from socket */
char *srchost_str;
char *srcport_str;
char *dsthost_str;
char *dstport_str;
/* log strings from HTTP request */
char *http_method;
char *http_uri;
char *http_host;
char *http_content_type;
/* log strings from HTTP response */
char *http_status_code;
char *http_status_text;
char *http_content_length;
/* log strings related to SSL */
char *ssl_names;
char *origcrtfpr;
char *usedcrtfpr;
#ifdef HAVE_LOCAL_PROCINFO
/* local process information */
pxy_conn_lproc_desc_t lproc;
#endif /* HAVE_LOCAL_PROCINFO */
/* content log context */
log_content_ctx_t logctx;
/* store fd and fd event while connected is 0 */
evutil_socket_t fd;
struct event *ev;
/* original source and destination address, family and certificate */
struct sockaddr_storage srcaddr;
socklen_t srcaddrlen;
struct sockaddr_storage dstaddr;
socklen_t dstaddrlen;
int af;
X509 *origcrt;
/* references to event base and configuration */
struct event_base *evbase;
struct evdns_base *dnsbase;
int thridx;
pxy_thrmgr_ctx_t *thrmgr;
proxyspec_t *spec;
opts_t *opts;
} pxy_conn_ctx_t;
#define WANT_CONNECT_LOG(ctx) ((ctx)->opts->connectlog||!(ctx)->opts->detach)
#ifndef WITHOUT_MIRROR
#define WANT_CONTENT_LOG(ctx) (((ctx)->opts->contentlog||(ctx)->opts->pcaplog||(ctx)->opts->mirrorif)&&!(ctx)->passthrough)
#else /* WITHOUT_MIRROR */
#define WANT_CONTENT_LOG(ctx) (((ctx)->opts->contentlog||(ctx)->opts->pcaplog)&&!(ctx)->passthrough)
#endif /* WITHOUT_MIRROR */
static pxy_conn_ctx_t *
pxy_conn_ctx_new(proxyspec_t *spec, opts_t *opts,
pxy_thrmgr_ctx_t *thrmgr, evutil_socket_t fd)
MALLOC NONNULL(1,2,3);
static pxy_conn_ctx_t *
pxy_conn_ctx_new(proxyspec_t *spec, opts_t *opts,
pxy_thrmgr_ctx_t *thrmgr, evutil_socket_t fd)
{
pxy_conn_ctx_t *ctx = malloc(sizeof(pxy_conn_ctx_t));
if (!ctx)
return NULL;
memset(ctx, 0, sizeof(pxy_conn_ctx_t));
ctx->spec = spec;
ctx->opts = opts;
ctx->clienthello_search = spec->upgrade;
ctx->fd = fd;
ctx->thridx = pxy_thrmgr_attach(thrmgr, &ctx->evbase, &ctx->dnsbase);
ctx->thrmgr = thrmgr;
#ifdef HAVE_LOCAL_PROCINFO
ctx->lproc.pid = -1;
#endif /* HAVE_LOCAL_PROCINFO */
#ifdef DEBUG_PROXY
if (OPTS_DEBUG(opts)) {
log_dbg_printf("%p pxy_conn_ctx_new\n",
(void*)ctx);
}
#endif /* DEBUG_PROXY */
return ctx;
}
static void NONNULL(1)
pxy_conn_ctx_free(pxy_conn_ctx_t *ctx, int by_requestor)
{
#ifdef DEBUG_PROXY
if (OPTS_DEBUG(ctx->opts)) {
log_dbg_printf("%p pxy_conn_ctx_free\n",
(void*)ctx);
}
#endif /* DEBUG_PROXY */
if (WANT_CONTENT_LOG(ctx)) {
if (log_content_close(&ctx->logctx, by_requestor) == -1) {
log_err_printf("Warning: Content log close failed\n");
}
}
pxy_thrmgr_detach(ctx->thrmgr, ctx->thridx);
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);
}
free(ctx);
}
/* 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 *);
/* 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) && LIBRESSL_VERSION_NUMBER < 0x20800000L)
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_printf("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, "%s %s %s %s %s"
#ifdef HAVE_LOCAL_PROCINFO
" %s"
#endif /* HAVE_LOCAL_PROCINFO */
"\n",
ctx->passthrough ? "passthrough" : "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, "%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" : "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),
SSL_get_version(ctx->dst.ssl),
SSL_get_cipher(ctx->dst.ssl),
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);
}
if (ctx->opts->connectlog) {
if (log_connect_print_free(msg) == -1) {
log_err_printf("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_printf("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;
}
} 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->spec->ssl) {
rv = asprintf(&msg, "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, "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),
SSL_get_version(ctx->dst.ssl),
SSL_get_cipher(ctx->dst.ssl),
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);
}
if (ctx->opts->connectlog) {
if (log_connect_print_free(msg) == -1) {
log_err_printf("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;
}
/*
* 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_printf("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) && LIBRESSL_VERSION_NUMBER < 0x20800000L)
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);
#if (OPENSSL_VERSION_NUMBER >= 0x10100000L) && !defined(LIBRESSL_VERSION_NUMBER)
/*
* For maximum interoperability, force the security level to 0, meaning
* all algorithms are permitted. If we don't set the security level,
* the level is taken from OpenSSL system configuration or library
* compile-time defaults. Security levels above 0 will reject weak
* algorithms and key sizes both locally at load time and when they are
* encountered from peers we receive connections from or connect to.
* Specifically, our prevous default RSA leaf key size of 1024 bits
* was rejected by a security level of 2 or higher (issue #248).
*/
SSL_CTX_set_security_level(sslctx, 0);
#endif /* OPENSSL_VERSION_NUMBER >= 0x10100000L */
}
/*
* 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) {
ctx->enomem = 1;
return NULL;
}
pxy_sslctx_setoptions(sslctx, ctx);
#if (OPENSSL_VERSION_NUMBER >= 0x10100000L) && !defined(LIBRESSL_VERSION_NUMBER)
if (ctx->opts->sslversion) {
if (SSL_CTX_set_min_proto_version(sslctx, ctx->opts->sslversion) == 0 ||
SSL_CTX_set_max_proto_version(sslctx, ctx->opts->sslversion) == 0) {
SSL_CTX_free(sslctx);
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 */
if (SSL_CTX_use_certificate(sslctx, crt) != 1) {
log_dbg_printf("loading src server certificate failed\n");
SSL_CTX_free(sslctx);
return NULL;
}
if (SSL_CTX_use_PrivateKey(sslctx, key) != 1) {
log_dbg_printf("loading src server key failed\n");
SSL_CTX_free(sslctx);
return NULL;
}
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;
if (!ctx->origcrtfpr)
return -1;
if (is_orig) {
rv = asprintf(&fn, "%s/%s.crt", ctx->opts->certgendir,
ctx->origcrtfpr);
} else {
if (!ctx->usedcrtfpr)
return -1;
rv = asprintf(&fn, "%s/%s-%s.crt", ctx->opts->certgendir,
ctx->origcrtfpr, ctx->usedcrtfpr);
}
if (rv == -1) {
ctx->enomem = 1;
return -1;
}
rv = log_cert_submit(fn, crt);
free(fn);
return rv;
}
static void
pxy_srccert_write(pxy_conn_ctx_t *ctx)
{
if (ctx->opts->certgen_writeall || ctx->generated_cert) {
if (pxy_srccert_write_to_gendir(ctx,
SSL_get_certificate(ctx->src.ssl), 0) == -1) {
log_err_printf("Failed to write used certificate\n");
}
}
if (ctx->opts->certgen_writeall) {
if (pxy_srccert_write_to_gendir(ctx, ctx->origcrt, 1) == -1) {
log_err_printf("Failed to write orig certificate\n");
}
}
}
static cert_t *
pxy_srccert_create(pxy_conn_ctx_t *ctx)
{
cert_t *cert = NULL;
if (ctx->opts->leafcertdir) {
if (ctx->sni) {
cert = cachemgr_tgcrt_get(ctx->sni);
if (!cert) {
char *wildcarded;
wildcarded = ssl_wildcardify(ctx->sni);
if (!wildcarded) {
ctx->enomem = 1;
return NULL;
}
cert = cachemgr_tgcrt_get(wildcarded);
free(wildcarded);
}
if (cert && OPTS_DEBUG(ctx->opts)) {
log_dbg_printf("Target cert by SNI\n");
}
} else if (ctx->origcrt) {
char **names = ssl_x509_names(ctx->origcrt);
for (char **p = names; *p; p++) {
if (!cert) {
cert = cachemgr_tgcrt_get(*p);
}
if (!cert) {
char *wildcarded;
wildcarded = ssl_wildcardify(*p);
if (!wildcarded) {
ctx->enomem = 1;
} else {
/* increases ref count */
cert = cachemgr_tgcrt_get(
wildcarded);
free(wildcarded);
}
}
free(*p);
}
free(names);
if (ctx->enomem) {
return NULL;
}
if (cert && OPTS_DEBUG(ctx->opts)) {
log_dbg_printf("Target cert by origcrt\n");
}
}
if (cert) {
ctx->immutable_cert = 1;
}
}
if (!cert && ctx->opts->defaultleafcert) {
cert = ctx->opts->defaultleafcert;
cert_refcount_inc(cert);
ctx->immutable_cert = 1;
if (OPTS_DEBUG(ctx->opts)) {
log_dbg_printf("Using default leaf certificate\n");
}
}
if (!cert && ctx->origcrt && ctx->opts->leafkey) {
cert = cert_new();
cert->crt = cachemgr_fkcrt_get(ctx->origcrt);
if (cert->crt) {
if (OPTS_DEBUG(ctx->opts)) {
log_dbg_printf("Certificate cache: HIT\n");
}
} else {
if (OPTS_DEBUG(ctx->opts)) {
log_dbg_printf("Certificate cache: MISS\n");
}
cert->crt = ssl_x509_forge(ctx->opts->cacrt,
ctx->opts->cakey,
ctx->origcrt,
ctx->opts->leafkey,
NULL,
ctx->opts->leafcrlurl);
cachemgr_fkcrt_set(ctx->origcrt, cert->crt);
}
cert_set_key(cert, ctx->opts->leafkey);
cert_set_chain(cert, ctx->opts->cachain);
ctx->generated_cert = 1;
}
if ((WANT_CONNECT_LOG(ctx) || ctx->opts->certgendir) && ctx->origcrt) {
ctx->origcrtfpr = ssl_x509_fingerprint(ctx->origcrt, 0);
if (!ctx->origcrtfpr)
ctx->enomem = 1;
}
if ((WANT_CONNECT_LOG(ctx) || ctx->opts->certgen_writeall) &&
cert && cert->crt) {
ctx->usedcrtfpr = ssl_x509_fingerprint(cert->crt, 0);
if (!ctx->usedcrtfpr)
ctx->enomem = 1;
}
return cert;
}
/*
* Create new SSL context for the incoming connection, based on the original
* destination SSL certificate.
* Returns NULL if no suitable certificate could be found.
*/
static SSL *
pxy_srcssl_create(pxy_conn_ctx_t *ctx, SSL *origssl)
{
cert_t *cert;
cachemgr_dsess_set((struct sockaddr*)&ctx->dstaddr,
ctx->dstaddrlen, ctx->sni,
SSL_get0_session(origssl));