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cachedsess.c
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cachedsess.c
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/*-
* SSLsplit - transparent SSL/TLS interception
* https://www.roe.ch/SSLsplit
*
* Copyright (c) 2009-2019, Daniel Roethlisberger <[email protected]>.
* 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 "cachedsess.h"
#include "dynbuf.h"
#include "ssl.h"
#include "khash.h"
#include <netinet/in.h>
/*
* Cache for outgoing dst connection SSL sessions.
*
* key: dynbuf_t * original destination IP address, port and SNI string
* val: dynbuf_t * ASN.1 serialized SSL_SESSION
*/
static inline khint_t
kh_dynbuf_hash_func(dynbuf_t *b)
{
khint_t *p = (khint_t *)b->buf;
khint_t h = 0;
int rem;
if ((rem = b->sz % sizeof(khint_t))) {
memcpy(&h, b->buf + b->sz - rem, rem);
}
while (p < (khint_t*)(b->buf + b->sz - rem)) {
h ^= *p++;
}
return h;
}
#define kh_dynbuf_hash_equal(a, b) \
(((a)->sz == (b)->sz) && \
(memcmp((a)->buf, (b)->buf, (a)->sz) == 0))
KHASH_INIT(dynbufmap_t, dynbuf_t*, dynbuf_t*, 1, kh_dynbuf_hash_func,
kh_dynbuf_hash_equal)
static khash_t(dynbufmap_t) *dstsessmap;
static cache_iter_t
cachedsess_begin_cb(void)
{
return kh_begin(dstsessmap);
}
static cache_iter_t
cachedsess_end_cb(void)
{
return kh_end(dstsessmap);
}
static int
cachedsess_exist_cb(cache_iter_t it)
{
return kh_exist(dstsessmap, it);
}
static void
cachedsess_del_cb(cache_iter_t it)
{
kh_del(dynbufmap_t, dstsessmap, it);
}
static cache_iter_t
cachedsess_get_cb(cache_key_t key)
{
return kh_get(dynbufmap_t, dstsessmap, key);
}
static cache_iter_t
cachedsess_put_cb(cache_key_t key, int *ret)
{
return kh_put(dynbufmap_t, dstsessmap, key, ret);
}
static void
cachedsess_free_key_cb(cache_key_t key)
{
dynbuf_free(key);
}
static void
cachedsess_free_val_cb(cache_val_t val)
{
dynbuf_free(val);
}
static cache_key_t
cachedsess_get_key_cb(cache_iter_t it)
{
return kh_key(dstsessmap, it);
}
static cache_val_t
cachedsess_get_val_cb(cache_iter_t it)
{
return kh_val(dstsessmap, it);
}
static void
cachedsess_set_val_cb(cache_iter_t it, cache_val_t val)
{
kh_val(dstsessmap, it) = val;
}
static cache_val_t
cachedsess_unpackverify_val_cb(cache_val_t val, int copy)
{
dynbuf_t *valbuf = val;
SSL_SESSION *sess;
const unsigned char *p;
p = (const unsigned char *)valbuf->buf;
sess = d2i_SSL_SESSION(NULL, &p, valbuf->sz); /* increments p */
if (!sess)
return NULL;
if (!ssl_session_is_valid(sess)) {
SSL_SESSION_free(sess);
return NULL;
}
if (copy)
return sess;
SSL_SESSION_free(sess);
return ((void*)-1);
}
static void
cachedsess_fini_cb(void)
{
kh_destroy(dynbufmap_t, dstsessmap);
}
void
cachedsess_init_cb(cache_t *cache)
{
dstsessmap = kh_init(dynbufmap_t);
cache->begin_cb = cachedsess_begin_cb;
cache->end_cb = cachedsess_end_cb;
cache->exist_cb = cachedsess_exist_cb;
cache->del_cb = cachedsess_del_cb;
cache->get_cb = cachedsess_get_cb;
cache->put_cb = cachedsess_put_cb;
cache->free_key_cb = cachedsess_free_key_cb;
cache->free_val_cb = cachedsess_free_val_cb;
cache->get_key_cb = cachedsess_get_key_cb;
cache->get_val_cb = cachedsess_get_val_cb;
cache->set_val_cb = cachedsess_set_val_cb;
cache->unpackverify_val_cb = cachedsess_unpackverify_val_cb;
cache->fini_cb = cachedsess_fini_cb;
}
cache_key_t
cachedsess_mkkey(const struct sockaddr *addr, UNUSED const socklen_t addrlen,
const char *sni)
{
dynbuf_t tmp, *db;
short port;
size_t snilen;
switch (((struct sockaddr_storage *)addr)->ss_family) {
case AF_INET:
tmp.buf = (unsigned char *)
&((struct sockaddr_in*)addr)->sin_addr;
tmp.sz = sizeof(struct in_addr);
port = ((struct sockaddr_in*)addr)->sin_port;
break;
case AF_INET6:
tmp.buf = (unsigned char *)
&((struct sockaddr_in6*)addr)->sin6_addr;
tmp.sz = sizeof(struct in6_addr);
port = ((struct sockaddr_in6*)addr)->sin6_port;
break;
default:
return NULL;
}
snilen = sni ? strlen(sni) : 0;
if (!(db = dynbuf_new_alloc(tmp.sz + sizeof(port) + snilen)))
return NULL;
memcpy(db->buf, tmp.buf, tmp.sz);
memcpy(db->buf + tmp.sz, (char*)&port, sizeof(port));
memcpy(db->buf + tmp.sz + sizeof(port), sni, snilen);
return db;
}
cache_val_t
cachedsess_mkval(SSL_SESSION *sess)
{
dynbuf_t *db;
unsigned char *p;
size_t asn1sz;
asn1sz = i2d_SSL_SESSION(sess, NULL);
if (!asn1sz || !(db = dynbuf_new_alloc(asn1sz))) {
return NULL;
}
p = db->buf;
i2d_SSL_SESSION(sess, &p); /* updates p */
return db;
}
/* vim: set noet ft=c: */