* tunnel endpoints. It has less protocol overhead than IPSec in Tunnel
* mode and allows tunneling of every ETHER TYPE protocol (e.g.
* ethernet, ip, arp ...). satp directly includes cryptography and
- * message authentication based on the methodes used by SRTP. It is
+ * message authentication based on the methods used by SRTP. It is
* intended to deliver a generic, scaleable and secure solution for
* tunneling and relaying of packets of any protocol.
*
*
- * Copyright (C) 2007-2008 Othmar Gsenger, Erwin Nindl,
+ * Copyright (C) 2007-2014 Markus Grüneis, Othmar Gsenger, Erwin Nindl,
* Christian Pointner <satp@wirdorange.org>
*
* This file is part of Anytun.
*
* Anytun is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 3 as
- * published by the Free Software Foundation.
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * any later version.
*
* Anytun is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
- * along with anytun. If not, see <http://www.gnu.org/licenses/>.
+ * along with Anytun. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL. If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so. If you
+ * do not wish to do so, delete this exception statement from your
+ * version. If you delete this exception statement from all source
+ * files in the program, then also delete it here.
*/
#include "authAlgo.h"
Sha1AuthAlgo::Sha1AuthAlgo(kd_dir_t d) : AuthAlgo(d), key_(DIGEST_LENGTH)
{
-#ifndef USE_SSL_CRYPTO
+#if defined(USE_SSL_CRYPTO)
+ HMAC_CTX_init(&ctx_);
+ HMAC_Init_ex(&ctx_, NULL, 0, EVP_sha1(), NULL);
+#elif defined(USE_NETTLE)
+ // nothing here
+#else // USE_GCRYPT is the default
gcry_error_t err = gcry_md_open(&handle_, GCRY_MD_SHA1, GCRY_MD_FLAG_HMAC);
if(err) {
cLog.msg(Log::PRIO_ERROR) << "Sha1AuthAlgo::Sha1AuthAlgo: Failed to open message digest algo";
return;
- }
-#else
- HMAC_CTX_init(&ctx_);
- HMAC_Init_ex(&ctx_, NULL, 0, EVP_sha1(), NULL);
+ }
#endif
}
Sha1AuthAlgo::~Sha1AuthAlgo()
{
-#ifndef USE_SSL_CRYPTO
- if(handle_)
- gcry_md_close(handle_);
-#else
+#if defined(USE_SSL_CRYPTO)
HMAC_CTX_cleanup(&ctx_);
-#endif
+#elif defined(USE_NETTLE)
+ // nothing here
+#else // USE_GCRYPT is the default
+ if(handle_) {
+ gcry_md_close(handle_);
+ }
+#endif
}
void Sha1AuthAlgo::generate(KeyDerivation& kd, EncryptedPacket& packet)
{
-#ifndef USE_SSL_CRYPTO
- if(!handle_)
+#if defined(USE_GCRYPT)
+ if(!handle_) {
return;
+ }
#endif
packet.addAuthTag();
- if(!packet.getAuthTagLength())
+ if(!packet.getAuthTagLength()) {
return;
-
+ }
+
kd.generate(dir_, LABEL_AUTH, packet.getSeqNr(), key_);
-#ifndef USE_SSL_CRYPTO
+#if defined(USE_SSL_CRYPTO)
+ HMAC_Init_ex(&ctx_, key_.getBuf(), key_.getLength(), EVP_sha1(), NULL);
+
+ uint8_t hmac[DIGEST_LENGTH];
+ HMAC_Update(&ctx_, packet.getAuthenticatedPortion(), packet.getAuthenticatedPortionLength());
+ HMAC_Final(&ctx_, hmac, NULL);
+#elif defined(USE_NETTLE)
+ hmac_sha1_set_key(&ctx_, key_.getLength(), key_.getBuf());
+
+ uint8_t hmac[DIGEST_LENGTH];
+ hmac_sha1_update(&ctx_, packet.getAuthenticatedPortionLength(), packet.getAuthenticatedPortion());
+ hmac_sha1_digest(&ctx_, DIGEST_LENGTH, hmac);
+#else // USE_GCRYPT is the default
gcry_error_t err = gcry_md_setkey(handle_, key_.getBuf(), key_.getLength());
if(err) {
cLog.msg(Log::PRIO_ERROR) << "Sha1AuthAlgo::setKey: Failed to set hmac key: " << AnytunGpgError(err);
return;
- }
+ }
gcry_md_reset(handle_);
gcry_md_write(handle_, packet.getAuthenticatedPortion(), packet.getAuthenticatedPortionLength());
gcry_md_final(handle_);
- u_int8_t* hmac = gcry_md_read(handle_, 0);
-#else
- HMAC_Init_ex(&ctx_, key_.getBuf(), key_.getLength(), EVP_sha1(), NULL);
-
- u_int8_t hmac[DIGEST_LENGTH];
- HMAC_Update(&ctx_, packet.getAuthenticatedPortion(), packet.getAuthenticatedPortionLength());
- HMAC_Final(&ctx_, hmac, NULL);
+ uint8_t* hmac = gcry_md_read(handle_, 0);
#endif
- u_int8_t* tag = packet.getAuthTag();
- u_int32_t length = (packet.getAuthTagLength() < DIGEST_LENGTH) ? packet.getAuthTagLength() : DIGEST_LENGTH;
+ uint8_t* tag = packet.getAuthTag();
+ uint32_t length = (packet.getAuthTagLength() < DIGEST_LENGTH) ? packet.getAuthTagLength() : DIGEST_LENGTH;
- if(length > DIGEST_LENGTH)
+ if(length > DIGEST_LENGTH) {
std::memset(tag, 0, packet.getAuthTagLength());
+ }
std::memcpy(&tag[packet.getAuthTagLength() - length], &hmac[DIGEST_LENGTH - length], length);
}
bool Sha1AuthAlgo::checkTag(KeyDerivation& kd, EncryptedPacket& packet)
{
-#ifndef USE_SSL_CRYPTO
- if(!handle_)
+#if defined(USE_GCRYPT)
+ if(!handle_) {
return false;
+ }
#endif
packet.withAuthTag(true);
- if(!packet.getAuthTagLength())
+ if(!packet.getAuthTagLength()) {
return true;
+ }
kd.generate(dir_, LABEL_AUTH, packet.getSeqNr(), key_);
-#ifndef USE_SSL_CRYPTO
+#if defined(USE_SSL_CRYPTO)
+ HMAC_Init_ex(&ctx_, key_.getBuf(), key_.getLength(), EVP_sha1(), NULL);
+
+ uint8_t hmac[DIGEST_LENGTH];
+ HMAC_Update(&ctx_, packet.getAuthenticatedPortion(), packet.getAuthenticatedPortionLength());
+ HMAC_Final(&ctx_, hmac, NULL);
+#elif defined(USE_NETTLE)
+ hmac_sha1_set_key(&ctx_, key_.getLength(), key_.getBuf());
+
+ uint8_t hmac[DIGEST_LENGTH];
+ hmac_sha1_update(&ctx_, packet.getAuthenticatedPortionLength(), packet.getAuthenticatedPortion());
+ hmac_sha1_digest(&ctx_, DIGEST_LENGTH, hmac);
+#else // USE_GCRYPT is the default
gcry_error_t err = gcry_md_setkey(handle_, key_.getBuf(), key_.getLength());
if(err) {
cLog.msg(Log::PRIO_ERROR) << "Sha1AuthAlgo::setKey: Failed to set hmac key: " << AnytunGpgError(err);
return false;
- }
-
+ }
+
gcry_md_reset(handle_);
gcry_md_write(handle_, packet.getAuthenticatedPortion(), packet.getAuthenticatedPortionLength());
gcry_md_final(handle_);
- u_int8_t* hmac = gcry_md_read(handle_, 0);
-#else
- HMAC_Init_ex(&ctx_, key_.getBuf(), key_.getLength(), EVP_sha1(), NULL);
-
- u_int8_t hmac[DIGEST_LENGTH];
- HMAC_Update(&ctx_, packet.getAuthenticatedPortion(), packet.getAuthenticatedPortionLength());
- HMAC_Final(&ctx_, hmac, NULL);
+ uint8_t* hmac = gcry_md_read(handle_, 0);
#endif
- u_int8_t* tag = packet.getAuthTag();
- u_int32_t length = (packet.getAuthTagLength() < DIGEST_LENGTH) ? packet.getAuthTagLength() : DIGEST_LENGTH;
+ uint8_t* tag = packet.getAuthTag();
+ uint32_t length = (packet.getAuthTagLength() < DIGEST_LENGTH) ? packet.getAuthTagLength() : DIGEST_LENGTH;
if(length > DIGEST_LENGTH)
- for(u_int32_t i=0; i < (packet.getAuthTagLength() - DIGEST_LENGTH); ++i)
- if(tag[i]) return false;
+ for(uint32_t i=0; i < (packet.getAuthTagLength() - DIGEST_LENGTH); ++i)
+ if(tag[i]) { return false; }
int ret = std::memcmp(&tag[packet.getAuthTagLength() - length], &hmac[DIGEST_LENGTH - length], length);
packet.removeAuthTag();
-
- if(ret)
+
+ if(ret) {
return false;
+ }
return true;
-
}
#endif
-
projects / anytun.git / blobdiff