mirror of
https://github.com/deneraraujo/OpenVPNAdapter.git
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Merge commit '86cc97e55fe346502462284d2e636a2b3708163e' as 'Sources/OpenVPN3'
This commit is contained in:
Sergey Abramchuk
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// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2012-2017 OpenVPN Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License Version 3
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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// Encapsulate the state of a static or dynamic authentication challenge.
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#ifndef OPENVPN_AUTH_CR_H
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#define OPENVPN_AUTH_CR_H
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#include <string>
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#include <sstream>
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#include <vector>
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#include <openvpn/common/exception.hpp>
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#include <openvpn/common/base64.hpp>
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#include <openvpn/common/split.hpp>
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#include <openvpn/common/rc.hpp>
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#include <openvpn/common/string.hpp>
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// Static Challenge response:
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// SCRV1:<BASE64_PASSWORD>:<BASE64_RESPONSE>
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//
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// Dynamic Challenge:
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// CRV1:<FLAGS>:<STATE_ID>:<BASE64_USERNAME>:<CHALLENGE_TEXT>
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// FLAGS is a comma-separated list of options:
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// E -- echo
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// R -- response required
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//
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// Dynamic Challenge response:
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// Username: [username decoded from username_base64]
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// Password: CRV1::<STATE_ID>::<RESPONSE_TEXT>
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namespace openvpn {
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class ChallengeResponse : public RC<thread_unsafe_refcount> {
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public:
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typedef RCPtr<ChallengeResponse> Ptr;
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OPENVPN_SIMPLE_EXCEPTION(dynamic_challenge_parse_error);
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OPENVPN_SIMPLE_EXCEPTION(static_challenge_parse_error);
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ChallengeResponse()
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: echo(false), response_required(false)
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{
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}
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explicit ChallengeResponse(const std::string& cookie)
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: echo(false), response_required(false)
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{
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init(cookie);
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}
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ChallengeResponse(const std::string& cookie, const std::string& user)
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: echo(false), response_required(false)
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{
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if (!is_dynamic(cookie) && cookie.find_first_of(':') == std::string::npos)
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{
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state_id = cookie;
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username = user;
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}
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else
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init(cookie);
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}
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void init(const std::string& cookie)
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{
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typedef std::vector<std::string> StringList;
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StringList sl;
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sl.reserve(5);
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Split::by_char_void<StringList, NullLex, Split::NullLimit>(sl, cookie, ':', 0, 4);
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if (sl.size() != 5)
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throw dynamic_challenge_parse_error();
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if (sl[0] != "CRV1")
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throw dynamic_challenge_parse_error();
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// parse options
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{
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StringList opt;
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opt.reserve(2);
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Split::by_char_void<StringList, NullLex, Split::NullLimit>(opt, sl[1], ',');
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for (StringList::const_iterator i = opt.begin(); i != opt.end(); ++i)
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{
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if (*i == "E")
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echo = true;
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else if (*i == "R")
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response_required = true;
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}
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}
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// save state ID
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state_id = sl[2];
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// save username
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try {
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username = base64->decode(sl[3]);
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}
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catch (const Base64::base64_decode_error&)
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{
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throw dynamic_challenge_parse_error();
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}
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// save challenge
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challenge_text = sl[4];
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}
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static bool is_dynamic(const std::string& s)
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{
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return string::starts_with(s, "CRV1:");
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}
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static bool is_static(const std::string& s)
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{
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return string::starts_with(s, "SCRV1:");
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}
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static void validate_dynamic(const std::string& cookie)
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{
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ChallengeResponse cr(cookie);
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}
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std::string construct_dynamic_password(const std::string& response) const
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{
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std::ostringstream os;
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os << "CRV1::" << state_id << "::" << response;
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return os.str();
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}
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static std::string construct_static_password(const std::string& password,
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const std::string& response)
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{
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std::ostringstream os;
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os << "SCRV1:" << base64->encode(password) << ':' << base64->encode(response);
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return os.str();
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}
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static void parse_static_cookie(const std::string& cookie,
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std::string& password,
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std::string& response)
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{
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typedef std::vector<std::string> StringList;
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StringList sl;
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sl.reserve(3);
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Split::by_char_void<StringList, NullLex, Split::NullLimit>(sl, cookie, ':');
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if (sl.size() != 3)
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throw static_challenge_parse_error();
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if (sl[0] != "SCRV1")
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throw static_challenge_parse_error();
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// get password
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try {
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password = base64->decode(sl[1]);
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}
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catch (const Base64::base64_decode_error&)
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{
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throw static_challenge_parse_error();
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}
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// get response
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try {
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response = base64->decode(sl[2]);
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}
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catch (const Base64::base64_decode_error&)
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{
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throw static_challenge_parse_error();
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}
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}
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static std::string generate_dynamic_challenge(const std::string& session_token,
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const std::string& username,
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const std::string& challenge,
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const bool echo,
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const bool response_required)
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{
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std::ostringstream os;
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bool comma = false;
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os << "CRV1:";
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if (echo)
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{
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if (comma)
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os << ",";
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os << "E";
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comma = true;
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}
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if (response_required)
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{
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if (comma)
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os << ",";
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os << "R";
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comma = true;
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}
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os << ':' << session_token;
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os << ':' << base64->encode(username);
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os << ':' << challenge;
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return os.str();
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}
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const std::string& get_state_id() const { return state_id; }
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const std::string& get_username() const { return username; }
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bool get_echo() const { return echo; }
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bool get_response_required() const { return response_required; }
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const std::string& get_challenge_text() const { return challenge_text; }
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private:
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bool echo;
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bool response_required;
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std::string state_id;
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std::string username;
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std::string challenge_text;
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};
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}
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#endif
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