openvpn3/openvpn/http/headredact.hpp

//    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) 2012-2020 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/>.

#pragma once

#include <string>
#include <regex>

namespace openvpn {
  namespace HTTP {

    inline std::string headers_redact(const std::string& headers)
    {
#ifdef OPENVPN_HTTP_HEADERS_NO_REDACT
      return headers;
#else
      // C++14 only solution (not compatible with RHEL7/CentOS7)
      //static const std::regex re(R"((authorization[\s:=]+basic\s+)([^\s]+))", std::regex_constants::ECMAScript | std::regex_constants::icase);
      //return std::regex_replace(headers, re, "$1[REDACTED]");
      std::stringstream result;

      std::istringstream iss(headers);

      for (std::string line; std::getline(iss, line);)
	{
	  int authpos;
	  if ((authpos = line.find("Authorization: ")) !=-1)
	    {
	      auto auth = line.substr(authpos);
	      auto argument = auth.substr(auth.find(' ') + 1);
	      std::string authtype;
	      int arg1=-1;
	      if ((arg1 = argument.find(' ')) !=  -1)
		{
		  authtype = argument.substr(0, arg1);
		}
	      result << line.substr(0, authpos) << "Authorization: " << authtype << " [REDACTED]\r" << std::endl;
	    }
	  else if ((authpos = line.find("authorization=basic ")) != -1)
	    {
	      result << line.substr(0, authpos)  << "authorization=basic [REDACTED]\r" << std::endl;
	    }
	  else
	    {
	      result << line << std::endl;
	    }
	}
      return result.str();
#endif
    }

  }
}