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183 lines
4.4 KiB
C
183 lines
4.4 KiB
C
/*
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* SSLsplit - transparent SSL/TLS interception
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* Copyright (c) 2009-2015, Daniel Roethlisberger <daniel@roe.ch>
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* All rights reserved.
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* http://www.roe.ch/SSLsplit
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "cachefkcrt.h"
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#include "ssl.h"
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#include "khash.h"
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/*
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* Cache for generated fake certificates.
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*
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* key: char[SSL_X509_FPRSZ] fingerprint of original server cert
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* val: X509 * generated fake certificate
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*/
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static inline khint_t
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kh_x509fpr_hash_func(void *b)
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{
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khint_t *p = (khint_t*)(((char*)b) + SSL_X509_FPRSZ);
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khint_t h = 0;
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/* assumes fpr is uniformly distributed */
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while (--p >= (khint_t*)b)
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h ^= *p;
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return h;
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}
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#define kh_x509fpr_hash_equal(a, b) \
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(memcmp((char*)(a), (char*)(b), SSL_X509_FPRSZ) == 0)
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KHASH_INIT(sha1map_t, void*, void*, 1, kh_x509fpr_hash_func,
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kh_x509fpr_hash_equal)
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static khash_t(sha1map_t) *certmap;
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static cache_iter_t
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cachefkcrt_begin_cb(void)
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{
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return kh_begin(certmap);
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}
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static cache_iter_t
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cachefkcrt_end_cb(void)
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{
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return kh_end(certmap);
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}
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static int
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cachefkcrt_exist_cb(cache_iter_t it)
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{
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return kh_exist(certmap, it);
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}
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static void
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cachefkcrt_del_cb(cache_iter_t it)
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{
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kh_del(sha1map_t, certmap, it);
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}
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static cache_iter_t
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cachefkcrt_get_cb(cache_key_t key)
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{
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return kh_get(sha1map_t, certmap, key);
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}
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static cache_iter_t
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cachefkcrt_put_cb(cache_key_t key, int *ret)
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{
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return kh_put(sha1map_t, certmap, key, ret);
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}
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static void
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cachefkcrt_free_key_cb(cache_key_t key)
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{
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free(key);
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}
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static void
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cachefkcrt_free_val_cb(cache_val_t val)
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{
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X509_free(val);
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}
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static cache_key_t
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cachefkcrt_get_key_cb(cache_iter_t it)
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{
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return kh_key(certmap, it);
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}
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static cache_val_t
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cachefkcrt_get_val_cb(cache_iter_t it)
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{
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return kh_val(certmap, it);
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}
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static void
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cachefkcrt_set_val_cb(cache_iter_t it, cache_val_t val)
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{
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kh_val(certmap, it) = val;
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}
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static cache_val_t
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cachefkcrt_unpackverify_val_cb(cache_val_t val, int copy)
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{
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if (!ssl_x509_is_valid(val))
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return NULL;
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if (copy) {
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ssl_x509_refcount_inc(val);
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return val;
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}
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return ((void*)-1);
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}
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static void
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cachefkcrt_fini_cb(void)
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{
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kh_destroy(sha1map_t, certmap);
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}
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void
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cachefkcrt_init_cb(cache_t *cache)
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{
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certmap = kh_init(sha1map_t);
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cache->begin_cb = cachefkcrt_begin_cb;
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cache->end_cb = cachefkcrt_end_cb;
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cache->exist_cb = cachefkcrt_exist_cb;
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cache->del_cb = cachefkcrt_del_cb;
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cache->get_cb = cachefkcrt_get_cb;
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cache->put_cb = cachefkcrt_put_cb;
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cache->free_key_cb = cachefkcrt_free_key_cb;
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cache->free_val_cb = cachefkcrt_free_val_cb;
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cache->get_key_cb = cachefkcrt_get_key_cb;
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cache->get_val_cb = cachefkcrt_get_val_cb;
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cache->set_val_cb = cachefkcrt_set_val_cb;
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cache->unpackverify_val_cb = cachefkcrt_unpackverify_val_cb;
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cache->fini_cb = cachefkcrt_fini_cb;
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}
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cache_key_t
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cachefkcrt_mkkey(X509 *keycrt)
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{
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unsigned char *fpr;
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if (!(fpr = malloc(SSL_X509_FPRSZ)))
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return NULL;
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ssl_x509_fingerprint_sha1(keycrt, fpr);
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return fpr;
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}
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cache_val_t
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cachefkcrt_mkval(X509 *valcrt)
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{
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ssl_x509_refcount_inc(valcrt);
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return valcrt;
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}
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/* vim: set noet ft=c: */
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