414 lines
8.4 KiB
C++
414 lines
8.4 KiB
C++
/*
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* This file Copyright (C) 2007-2014 Mnemosyne LLC
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*
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* It may be used under the GNU GPL versions 2 or 3
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* or any future license endorsed by Mnemosyne LLC.
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*
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*/
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#ifdef __APPLE__
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/* OpenSSL "deprecated" as of OS X 10.7, but we still use it */
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#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
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#endif
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#include <openssl/bn.h>
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#include <openssl/crypto.h>
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#include <openssl/dh.h>
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#include <openssl/err.h>
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#include <openssl/evp.h>
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#include <openssl/opensslv.h>
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#include <openssl/rand.h>
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#include <openssl/ssl.h>
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#include <openssl/x509.h>
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#include "transmission.h"
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#include "crypto-utils.h"
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#include "log.h"
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#include "tr-assert.h"
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#include "utils.h"
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#define TR_CRYPTO_DH_SECRET_FALLBACK
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#include "crypto-utils-fallback.cc"
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/***
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****
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***/
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#define MY_NAME "tr_crypto_utils"
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static void log_openssl_error(char const* file, int line)
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{
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unsigned long const error_code = ERR_get_error();
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if (tr_logLevelIsActive(TR_LOG_ERROR))
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{
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char buf[512];
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#ifndef TR_LIGHTWEIGHT
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static bool strings_loaded = false;
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if (!strings_loaded)
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{
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#if OPENSSL_VERSION_NUMBER < 0x10100000 || (defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x20700000)
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ERR_load_crypto_strings();
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#else
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OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS, nullptr);
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#endif
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strings_loaded = true;
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}
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#endif
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ERR_error_string_n(error_code, buf, sizeof(buf));
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tr_logAddMessage(file, line, TR_LOG_ERROR, MY_NAME, "OpenSSL error: %s", buf);
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}
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}
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#define log_error() log_openssl_error(__FILE__, __LINE__)
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static bool check_openssl_result(int result, int expected_result, bool expected_equal, char const* file, int line)
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{
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bool const ret = (result == expected_result) == expected_equal;
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if (!ret)
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{
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log_openssl_error(file, line);
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}
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return ret;
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}
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#define check_result(result) check_openssl_result((result), 1, true, __FILE__, __LINE__)
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#define check_result_neq(result, x_result) check_openssl_result((result), (x_result), false, __FILE__, __LINE__)
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static bool check_openssl_pointer(void const* pointer, char const* file, int line)
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{
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bool const ret = pointer != nullptr;
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if (!ret)
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{
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log_openssl_error(file, line);
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}
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return ret;
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}
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#define check_pointer(pointer) check_openssl_pointer((pointer), __FILE__, __LINE__)
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/***
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****
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***/
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tr_sha1_ctx_t tr_sha1_init(void)
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{
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EVP_MD_CTX* handle = EVP_MD_CTX_create();
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if (check_result(EVP_DigestInit_ex(handle, EVP_sha1(), nullptr)))
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{
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return handle;
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}
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EVP_MD_CTX_destroy(handle);
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return nullptr;
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}
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bool tr_sha1_update(tr_sha1_ctx_t raw_handle, void const* data, size_t data_length)
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{
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auto* handle = static_cast<EVP_MD_CTX*>(raw_handle);
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TR_ASSERT(handle != nullptr);
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if (data_length == 0)
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{
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return true;
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}
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TR_ASSERT(data != nullptr);
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return check_result(EVP_DigestUpdate(handle, data, data_length));
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}
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bool tr_sha1_final(tr_sha1_ctx_t raw_handle, uint8_t* hash)
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{
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auto* handle = static_cast<EVP_MD_CTX*>(raw_handle);
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bool ret = true;
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if (hash != nullptr)
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{
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TR_ASSERT(handle != nullptr);
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unsigned int hash_length;
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ret = check_result(EVP_DigestFinal_ex(handle, hash, &hash_length));
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TR_ASSERT(!ret || hash_length == SHA_DIGEST_LENGTH);
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}
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EVP_MD_CTX_destroy(handle);
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return ret;
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}
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/***
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****
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***/
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#if OPENSSL_VERSION_NUMBER < 0x0090802fL
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static EVP_CIPHER_CTX* openssl_evp_cipher_context_new(void)
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{
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EVP_CIPHER_CTX* handle = tr_new(EVP_CIPHER_CTX, 1);
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if (handle != nullptr)
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{
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EVP_CIPHER_CTX_init(handle);
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}
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return handle;
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}
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static void openssl_evp_cipher_context_free(EVP_CIPHER_CTX* handle)
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{
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if (handle == nullptr)
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{
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return;
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}
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EVP_CIPHER_CTX_cleanup(handle);
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tr_free(handle);
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}
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#define EVP_CIPHER_CTX_new() openssl_evp_cipher_context_new()
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#define EVP_CIPHER_CTX_free(x) openssl_evp_cipher_context_free((x))
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#endif
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/***
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****
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***/
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#if OPENSSL_VERSION_NUMBER < 0x10100000 || (defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x20700000)
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static inline int DH_set0_pqg(DH* dh, BIGNUM* p, BIGNUM* q, BIGNUM* g)
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{
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/* If the fields p and g in d are NULL, the corresponding input
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* parameters MUST be non-NULL. q may remain NULL.
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*/
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if ((dh->p == nullptr && p == nullptr) || (dh->g == nullptr && g == nullptr))
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{
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return 0;
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}
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if (p != nullptr)
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{
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BN_free(dh->p);
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dh->p = p;
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}
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if (q != nullptr)
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{
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BN_free(dh->q);
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dh->q = q;
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}
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if (g != nullptr)
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{
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BN_free(dh->g);
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dh->g = g;
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}
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if (q != nullptr)
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{
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dh->length = BN_num_bits(q);
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}
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return 1;
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}
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static inline int DH_set_length(DH* dh, long length)
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{
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dh->length = length;
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return 1;
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}
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static inline void DH_get0_key(DH const* dh, BIGNUM const** pub_key, BIGNUM const** priv_key)
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{
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if (pub_key != nullptr)
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{
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*pub_key = dh->pub_key;
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}
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if (priv_key != nullptr)
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{
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*priv_key = dh->priv_key;
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}
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}
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#endif
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tr_dh_ctx_t tr_dh_new(
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uint8_t const* prime_num,
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size_t prime_num_length,
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uint8_t const* generator_num,
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size_t generator_num_length)
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{
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TR_ASSERT(prime_num != nullptr);
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TR_ASSERT(generator_num != nullptr);
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DH* handle = DH_new();
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BIGNUM* p;
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BIGNUM* g;
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p = BN_bin2bn(prime_num, prime_num_length, nullptr);
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g = BN_bin2bn(generator_num, generator_num_length, nullptr);
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if (!check_pointer(p) || !check_pointer(g) || DH_set0_pqg(handle, p, nullptr, g) == 0)
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{
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BN_free(p);
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BN_free(g);
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DH_free(handle);
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handle = nullptr;
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}
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return handle;
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}
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void tr_dh_free(tr_dh_ctx_t raw_handle)
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{
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auto* handle = static_cast<DH*>(raw_handle);
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if (handle == nullptr)
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{
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return;
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}
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DH_free(handle);
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}
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bool tr_dh_make_key(tr_dh_ctx_t raw_handle, size_t private_key_length, uint8_t* public_key, size_t* public_key_length)
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{
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TR_ASSERT(raw_handle != nullptr);
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TR_ASSERT(public_key != nullptr);
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auto* handle = static_cast<DH*>(raw_handle);
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int dh_size;
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int my_public_key_length;
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BIGNUM const* my_public_key;
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DH_set_length(handle, private_key_length * 8);
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if (!check_result(DH_generate_key(handle)))
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{
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return false;
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}
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DH_get0_key(handle, &my_public_key, nullptr);
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my_public_key_length = BN_bn2bin(my_public_key, public_key);
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dh_size = DH_size(handle);
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tr_dh_align_key(public_key, my_public_key_length, dh_size);
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if (public_key_length != nullptr)
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{
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*public_key_length = dh_size;
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}
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return true;
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}
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tr_dh_secret_t tr_dh_agree(tr_dh_ctx_t raw_handle, uint8_t const* other_public_key, size_t other_public_key_length)
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{
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auto* handle = static_cast<DH*>(raw_handle);
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TR_ASSERT(handle != nullptr);
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TR_ASSERT(other_public_key != nullptr);
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struct tr_dh_secret* ret;
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int dh_size;
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int secret_key_length;
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BIGNUM* other_key;
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if (!check_pointer(other_key = BN_bin2bn(other_public_key, other_public_key_length, nullptr)))
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{
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return nullptr;
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}
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dh_size = DH_size(handle);
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ret = tr_dh_secret_new(dh_size);
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secret_key_length = DH_compute_key(ret->key, other_key, handle);
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if (check_result_neq(secret_key_length, -1))
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{
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tr_dh_secret_align(ret, secret_key_length);
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}
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else
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{
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tr_dh_secret_free(ret);
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ret = nullptr;
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}
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BN_free(other_key);
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return ret;
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}
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/***
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****
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***/
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tr_x509_store_t tr_ssl_get_x509_store(tr_ssl_ctx_t handle)
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{
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if (handle == nullptr)
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{
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return nullptr;
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}
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return SSL_CTX_get_cert_store(static_cast<SSL_CTX const*>(handle));
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}
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bool tr_x509_store_add(tr_x509_store_t handle, tr_x509_cert_t cert)
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{
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TR_ASSERT(handle != nullptr);
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TR_ASSERT(cert != nullptr);
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return check_result(X509_STORE_add_cert(static_cast<X509_STORE*>(handle), static_cast<X509*>(cert)));
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}
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tr_x509_cert_t tr_x509_cert_new(void const* der, size_t der_length)
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{
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TR_ASSERT(der != nullptr);
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X509* const ret = d2i_X509(nullptr, (unsigned char const**)&der, der_length);
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if (ret == nullptr)
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{
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log_error();
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}
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return ret;
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}
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void tr_x509_cert_free(tr_x509_cert_t handle)
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{
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if (handle == nullptr)
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{
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return;
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}
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X509_free(static_cast<X509*>(handle));
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}
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/***
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****
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***/
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bool tr_rand_buffer(void* buffer, size_t length)
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{
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TR_ASSERT(buffer != nullptr);
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return check_result(RAND_bytes(static_cast<unsigned char*>(buffer), (int)length));
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}
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