Squashed 'Sources/OpenVPNAdapter/Libraries/Vendors/openvpn/' content from commit 554d8b888

git-subtree-dir: Sources/OpenVPNAdapter/Libraries/Vendors/openvpn git-subtree-split: 554d8b88817d3a7b836e78940ed61bb11ed2bd9b
2026-04-24 00:00:05 +08:00 · 2018-07-27 18:08:58 +03:00
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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 an OpenSSL EVP_PKEY object
+
+#ifndef OPENVPN_OPENSSL_PKI_PKEY_H
+#define OPENVPN_OPENSSL_PKI_PKEY_H
+
+#include <string>
+
+#include <openssl/ssl.h>
+#include <openssl/bio.h>
+
+#include <openvpn/common/size.hpp>
+#include <openvpn/common/exception.hpp>
+#include <openvpn/openssl/util/error.hpp>
+
+namespace openvpn {
+  namespace OpenSSLPKI {
+
+    class PKey
+    {
+    public:
+      PKey() : pkey_(nullptr) {}
+
+      PKey(const std::string& pkey_txt, const std::string& title)
+	: pkey_(nullptr)
+      {
+	parse_pem(pkey_txt, title);
+      }
+
+      PKey(const PKey& other)
+	: pkey_(nullptr)
+      {
+	assign(other.pkey_);
+      }
+
+      void operator=(const PKey& other)
+      {
+	assign(other.pkey_);
+	priv_key_pwd = other.priv_key_pwd;
+      }
+
+      bool defined() const { return pkey_ != nullptr; }
+      EVP_PKEY* obj() const { return pkey_; }
+
+      SSLConfigAPI::PKType key_type() const
+      {
+	switch (EVP_PKEY_id(pkey_))
+	{
+	case EVP_PKEY_RSA:
+	case EVP_PKEY_RSA2:
+	  return SSLConfigAPI::PK_RSA;
+	case EVP_PKEY_EC:
+	  return SSLConfigAPI::PK_EC;
+	case EVP_PKEY_DSA:
+	case EVP_PKEY_DSA1:
+	case EVP_PKEY_DSA2:
+	case EVP_PKEY_DSA3:
+	case EVP_PKEY_DSA4:
+	  return SSLConfigAPI::PK_DSA;
+	case EVP_PKEY_NONE:
+	  return SSLConfigAPI::PK_NONE;
+	default:
+	  return SSLConfigAPI::PK_UNKNOWN;
+	}
+      }
+
+      size_t key_length() const
+      {
+	int ret = i2d_PrivateKey(pkey_, NULL);
+	if (ret < 0)
+	  return 0;
+
+	/* convert to bits */
+	return ret * 8;
+      }
+
+      void set_private_key_password(const std::string& pwd)
+      {
+	priv_key_pwd = pwd;
+      }
+
+      void parse_pem(const std::string& pkey_txt, const std::string& title)
+      {
+	BIO *bio = BIO_new_mem_buf(const_cast<char *>(pkey_txt.c_str()), pkey_txt.length());
+	if (!bio)
+	  throw OpenSSLException();
+
+	EVP_PKEY *pkey = PEM_read_bio_PrivateKey(bio, nullptr, pem_password_callback, this);
+	BIO_free(bio);
+	if (!pkey)
+	  throw OpenSSLException(std::string("PKey::parse_pem: error in ") + title + std::string(":"));
+
+	erase();
+	pkey_ = pkey;
+      }
+
+      std::string render_pem() const
+      {
+	if (pkey_)
+	  {
+	    BIO *bio = BIO_new(BIO_s_mem());
+	    const int ret = PEM_write_bio_PrivateKey(bio, pkey_, nullptr, nullptr, 0, nullptr, nullptr);
+	    if (ret == 0)
+	      {
+		BIO_free(bio);
+		throw OpenSSLException("PKey::render_pem");
+	      }
+
+	    {
+	      char *temp;
+	      const int buf_len = BIO_get_mem_data(bio, &temp);
+	      std::string ret = std::string(temp, buf_len);
+	      BIO_free(bio);
+	      return ret;
+	    }
+	  }
+	else
+	  return "";
+      }
+
+      void erase()
+      {
+	if (pkey_)
+	  {
+	    EVP_PKEY_free(pkey_);
+	    pkey_ = nullptr;
+	  }
+      }
+
+      ~PKey()
+      {
+	erase();
+      }
+
+    private:
+      static int pem_password_callback (char *buf, int size, int rwflag, void *userdata)
+      {
+	// get this
+	const PKey* self = (PKey*) userdata;	
+	if (buf)
+	  {
+	    string::strncpynt(buf, self->priv_key_pwd.c_str(), size);
+	    return std::strlen(buf);
+	  }
+	return 0;
+      }
+
+      static EVP_PKEY *dup(const EVP_PKEY *pkey)
+      {
+	// No OpenSSL EVP_PKEY_dup method so we roll our own 
+	if (pkey)
+	  {
+	    EVP_PKEY* pDupKey = EVP_PKEY_new();
+	    RSA* pRSA = EVP_PKEY_get1_RSA(const_cast<EVP_PKEY *>(pkey));
+	    RSA* pRSADupKey = RSAPrivateKey_dup(pRSA);
+	    RSA_free(pRSA);
+	    EVP_PKEY_set1_RSA(pDupKey, pRSADupKey);
+	    RSA_free(pRSADupKey);
+	    return pDupKey;
+	  }
+	else
+	  return nullptr;
+      }
+
+      void assign(const EVP_PKEY *pkey)
+      {
+	erase();
+	pkey_ = dup(pkey);
+      }
+
+      std::string priv_key_pwd;
+      EVP_PKEY *pkey_;
+    };
+  }
+} // namespace openvpn
+
+#endif // OPENVPN_OPENSSL_PKI_PKEY_H