Merge commit '86cc97e55fe346502462284d2e636a2b3708163e' as 'Sources/OpenVPN3'

2026-04-24 00:00:05 +08:00 · 2020-02-24 14:43:11 +03:00
parent 133b3756e6 86cc97e55f
commit 32f1555929
655 changed files with 146468 additions and 0 deletions
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+//    OpenVPN -- An application to securely tunnel IP networks
+//               over a single port, with support for SSL/TLS-based
+//               session authentication and key exchange,
+//               packet encryption, packet authentication, and
+//               packet compression.
+//
+//    Copyright (C) 2012-2017 OpenVPN Inc.
+//
+//    This program is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Affero General Public License Version 3
+//    as published by the Free Software Foundation.
+//
+//    This program is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU Affero General Public License for more details.
+//
+//    You should have received a copy of the GNU Affero General Public License
+//    along with this program in the COPYING file.
+//    If not, see <http://www.gnu.org/licenses/>.
+
+// Wrap the OpenSSL digest API defined in <openssl/evp.h>
+// so that it can be used as part of the crypto layer of the OpenVPN core.
+
+#ifndef OPENVPN_OPENSSL_CRYPTO_DIGEST_H
+#define OPENVPN_OPENSSL_CRYPTO_DIGEST_H
+
+#include <string>
+
+#include <openssl/objects.h>
+#include <openssl/evp.h>
+#include <openssl/md4.h>
+#include <openssl/md5.h>
+#include <openssl/sha.h>
+#include <openssl/hmac.h>
+
+#include <openvpn/common/size.hpp>
+#include <openvpn/common/exception.hpp>
+#include <openvpn/crypto/cryptoalgs.hpp>
+#include <openvpn/openssl/util/error.hpp>
+
+#include <openvpn/openssl/compat.hpp>
+
+namespace openvpn {
+  namespace OpenSSLCrypto {
+    class HMACContext;
+
+    class DigestContext
+    {
+      DigestContext(const DigestContext&) = delete;
+      DigestContext& operator=(const DigestContext&) = delete;
+
+    public:
+      friend class HMACContext;
+
+      OPENVPN_SIMPLE_EXCEPTION(openssl_digest_uninitialized);
+      OPENVPN_EXCEPTION(openssl_digest_error);
+
+      enum {
+	MAX_DIGEST_SIZE = EVP_MAX_MD_SIZE
+      };
+
+      DigestContext()
+	: initialized(false)
+      {
+      }
+
+      DigestContext(const CryptoAlgs::Type alg)
+	: initialized(false)
+      {
+	init(alg);
+      }
+
+      ~DigestContext() { erase() ; }
+
+      void init(const CryptoAlgs::Type alg)
+      {
+	erase();
+	ctx=EVP_MD_CTX_new ();
+	if (!EVP_DigestInit(ctx, digest_type(alg)))
+	  {
+	    openssl_clear_error_stack();
+	    throw openssl_digest_error("EVP_DigestInit");
+	  }
+	initialized = true;
+      }
+
+      void update(const unsigned char *in, const size_t size)
+      {
+	check_initialized();
+	if (!EVP_DigestUpdate(ctx, in, int(size)))
+	  {
+	    openssl_clear_error_stack();
+	    throw openssl_digest_error("EVP_DigestUpdate");
+	  }
+      }
+
+      size_t final(unsigned char *out)
+      {
+	check_initialized();
+	unsigned int outlen;
+	if (!EVP_DigestFinal(ctx, out, &outlen))
+	  {
+	    openssl_clear_error_stack();
+	    throw openssl_digest_error("EVP_DigestFinal");
+	  }
+	return outlen;
+      }
+
+      size_t size() const
+      {
+	check_initialized();
+	return EVP_MD_CTX_size(ctx);
+      }
+
+      bool is_initialized() const { return initialized; }
+
+    private:
+      static const EVP_MD *digest_type(const CryptoAlgs::Type alg)
+      {
+	switch (alg)
+	  {
+	  case CryptoAlgs::MD4:
+	    return EVP_md4();
+	  case CryptoAlgs::MD5:
+	    return EVP_md5();
+	  case CryptoAlgs::SHA1:
+	    return EVP_sha1();
+	  case CryptoAlgs::SHA224:
+	    return EVP_sha224();
+	  case CryptoAlgs::SHA256:
+	    return EVP_sha256();
+	  case CryptoAlgs::SHA384:
+	    return EVP_sha384();
+	  case CryptoAlgs::SHA512:
+	    return EVP_sha512();
+	  default:
+	    OPENVPN_THROW(openssl_digest_error, CryptoAlgs::name(alg) << ": not usable");
+	  }
+      }
+
+      void erase()
+      {
+	if (initialized)
+	  {
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+	    EVP_MD_CTX_cleanup(ctx);
+#endif
+	    EVP_MD_CTX_free(ctx);
+	    initialized = false;
+	  }
+      }
+
+      void check_initialized() const
+      {
+#ifdef OPENVPN_ENABLE_ASSERT
+	if (!initialized)
+	  throw openssl_digest_uninitialized();
+#endif
+      }
+
+      bool initialized;
+      EVP_MD_CTX *ctx;
+    };
+  }
+}
+
+#endif