daemon/mgmt/command-authenticator.cpp - NFD - Gitiles

 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
  * Copyright (c) 2014-2018,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
  *                           Washington University in St. Louis,
  *                           Beijing Institute of Technology,
  *                           The University of Memphis.
  *
  * This file is part of NFD (Named Data Networking Forwarding Daemon).
  * See AUTHORS.md for complete list of NFD authors and contributors.
  *
  * NFD is free software: you can redistribute it and/or modify it under the terms
  * of the GNU General Public License as published by the Free Software Foundation,
  * either version 3 of the License, or (at your option) any later version.
  *
  * NFD 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 General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License along with
  * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
  */

 #include "command-authenticator.hpp"
 #include "core/logger.hpp"

 #include <ndn-cxx/tag.hpp>
 #include <ndn-cxx/security/v2/certificate-fetcher-offline.hpp>
 #include <ndn-cxx/security/v2/certificate-request.hpp>
 #include <ndn-cxx/security/v2/validation-policy.hpp>
 #include <ndn-cxx/security/v2/validation-policy-accept-all.hpp>
 #include <ndn-cxx/security/v2/validation-policy-command-interest.hpp>
 #include <ndn-cxx/security/v2/validator.hpp>
 #include <ndn-cxx/util/io.hpp>

 #include <boost/filesystem.hpp>

 namespace sec2 = ndn::security::v2;

 namespace nfd {

 NFD_LOG_INIT("CommandAuthenticator");
 // INFO: configuration change, etc
 // DEBUG: per authentication request result

 /** \brief an Interest tag to indicate command signer
  */
 using SignerTag = ndn::SimpleTag<Name, 20>;

 /** \brief obtain signer from SignerTag attached to Interest, if available
  */
 static optional<std::string>
 getSignerFromTag(const Interest& interest)
 {
   shared_ptr<SignerTag> signerTag = interest.getTag<SignerTag>();
   if (signerTag == nullptr) {
     return nullopt;
   }
   else {
     return signerTag->get().toUri();
   }
 }

 /** \brief a validation policy that only permits Interest signed by a trust anchor
  */
 class CommandAuthenticatorValidationPolicy : public sec2::ValidationPolicy
 {
 public:
   void
   checkPolicy(const Interest& interest, const shared_ptr<sec2::ValidationState>& state,
               const ValidationContinuation& continueValidation) final
   {
     Name klName = getKeyLocatorName(interest, *state);
     if (!state->getOutcome()) { // already failed
       return;
     }

     // SignerTag must be placed on the 'original Interest' in ValidationState to be available for
     // InterestValidationSuccessCallback. The 'interest' parameter refers to a different instance
     // which is copied into 'original Interest'.
     auto state1 = dynamic_pointer_cast<sec2::InterestValidationState>(state);
     state1->getOriginalInterest().setTag(make_shared<SignerTag>(klName));

     continueValidation(make_shared<sec2::CertificateRequest>(Interest(klName)), state);
   }

   void
   checkPolicy(const Data& data, const shared_ptr<sec2::ValidationState>& state,
               const ValidationContinuation& continueValidation) final
   {
     // Non-certificate Data are not handled by CommandAuthenticator.
     // Non-anchor certificates cannot be retrieved by offline fetcher.
     BOOST_ASSERT_MSG(false, "Data should not be passed to this policy");
   }
 };

 shared_ptr<CommandAuthenticator>
 CommandAuthenticator::create()
 {
   return shared_ptr<CommandAuthenticator>(new CommandAuthenticator);
 }

 CommandAuthenticator::CommandAuthenticator() = default;

 void
 CommandAuthenticator::setConfigFile(ConfigFile& configFile)
 {
   configFile.addSectionHandler("authorizations",
     bind(&CommandAuthenticator::processConfig, this, _1, _2, _3));
 }

 void
 CommandAuthenticator::processConfig(const ConfigSection& section, bool isDryRun, const std::string& filename)
 {
   if (!isDryRun) {
     NFD_LOG_INFO("clear-authorizations");
     for (auto& kv : m_validators) {
       kv.second = make_shared<sec2::Validator>(
         make_unique<sec2::ValidationPolicyCommandInterest>(make_unique<CommandAuthenticatorValidationPolicy>()),
         make_unique<sec2::CertificateFetcherOffline>());
     }
   }

   if (section.empty()) {
     BOOST_THROW_EXCEPTION(ConfigFile::Error("'authorize' is missing under 'authorizations'"));
   }

   int authSectionIndex = 0;
   for (const auto& kv : section) {
     if (kv.first != "authorize") {
       BOOST_THROW_EXCEPTION(ConfigFile::Error(
         "'" + kv.first + "' section is not permitted under 'authorizations'"));
     }
     const ConfigSection& authSection = kv.second;

     std::string certfile;
     try {
       certfile = authSection.get<std::string>("certfile");
     }
     catch (const boost::property_tree::ptree_error&) {
       BOOST_THROW_EXCEPTION(ConfigFile::Error(
         "'certfile' is missing under authorize[" + to_string(authSectionIndex) + "]"));
     }

     bool isAny = false;
     shared_ptr<sec2::Certificate> cert;
     if (certfile == "any") {
       isAny = true;
       NFD_LOG_WARN("'certfile any' is intended for demo purposes only and "
                    "SHOULD NOT be used in production environments");
     }
     else {
       using namespace boost::filesystem;
       path certfilePath = absolute(certfile, path(filename).parent_path());
       cert = ndn::io::load<sec2::Certificate>(certfilePath.string());
       if (cert == nullptr) {
         BOOST_THROW_EXCEPTION(ConfigFile::Error(
           "cannot load certfile " + certfilePath.string() +
           " for authorize[" + to_string(authSectionIndex) + "]"));
       }
     }

     const ConfigSection* privSection = nullptr;
     try {
       privSection = &authSection.get_child("privileges");
     }
     catch (const boost::property_tree::ptree_error&) {
       BOOST_THROW_EXCEPTION(ConfigFile::Error(
         "'privileges' is missing under authorize[" + to_string(authSectionIndex) + "]"));
     }

     if (privSection->empty()) {
       NFD_LOG_WARN("No privileges granted to certificate " << certfile);
     }
     for (const auto& kv : *privSection) {
       const std::string& module = kv.first;
       auto found = m_validators.find(module);
       if (found == m_validators.end()) {
         BOOST_THROW_EXCEPTION(ConfigFile::Error(
           "unknown module '" + module + "' under authorize[" + to_string(authSectionIndex) + "]"));
       }

       if (isDryRun) {
         continue;
       }

       if (isAny) {
         found->second = make_shared<sec2::Validator>(make_unique<sec2::ValidationPolicyAcceptAll>(),
                                                      make_unique<sec2::CertificateFetcherOffline>());
         NFD_LOG_INFO("authorize module=" << module << " signer=any");
       }
       else {
         const Name& keyName = cert->getKeyName();
         sec2::Certificate certCopy = *cert;
         found->second->loadAnchor(certfile, std::move(certCopy));
         NFD_LOG_INFO("authorize module=" << module << " signer=" << keyName <<
                      " certfile=" << certfile);
       }
     }

     ++authSectionIndex;
   }
 }

 ndn::mgmt::Authorization
 CommandAuthenticator::makeAuthorization(const std::string& module, const std::string& verb)
 {
   m_validators[module]; // declares module, so that privilege is recognized

   auto self = this->shared_from_this();
   return [=] (const Name&, const Interest& interest,
               const ndn::mgmt::ControlParameters*,
               const ndn::mgmt::AcceptContinuation& accept,
               const ndn::mgmt::RejectContinuation& reject) {
     auto validator = self->m_validators.at(module);
     auto successCb = [accept, validator] (const Interest& interest1) {
       auto signer1 = getSignerFromTag(interest1);
       BOOST_ASSERT(signer1 || // signer must be available unless 'certfile any'
                    dynamic_cast<sec2::ValidationPolicyAcceptAll*>(&validator->getPolicy()) != nullptr);
       std::string signer = signer1.value_or("*");
       NFD_LOG_DEBUG("accept " << interest1.getName() << " signer=" << signer);
       accept(signer);
     };
     auto failureCb = [reject] (const Interest& interest1, const sec2::ValidationError& err) {
       using ndn::mgmt::RejectReply;
       RejectReply reply = RejectReply::STATUS403;
       switch (err.getCode()) {
       case sec2::ValidationError::NO_SIGNATURE:
       case sec2::ValidationError::INVALID_KEY_LOCATOR:
         reply = RejectReply::SILENT;
         break;
       case sec2::ValidationError::POLICY_ERROR:
         if (interest1.getName().size() < ndn::command_interest::MIN_SIZE) { // "name too short"
           reply = RejectReply::SILENT;
         }
         break;
       }
       NFD_LOG_DEBUG("reject " << interest1.getName() << " signer=" <<
                     getSignerFromTag(interest1).value_or("?") << " reason=" << err);
       reject(reply);
     };

     if (validator) {
       validator->validate(interest, successCb, failureCb);
     }
     else {
       NFD_LOG_DEBUG("reject " << interest.getName() << " signer=" <<
                     getSignerFromTag(interest).value_or("?") << " reason=Unauthorized");
       reject(ndn::mgmt::RejectReply::STATUS403);
     }
   };
 }

 } // namespace nfd
	/* -- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -- */
	/*
	* Copyright (c) 2014-2018, Regents of the University of California,
	* Arizona Board of Regents,
	* Colorado State University,
	* University Pierre & Marie Curie, Sorbonne University,
	* Washington University in St. Louis,
	* Beijing Institute of Technology,
	* The University of Memphis.
	*
	* This file is part of NFD (Named Data Networking Forwarding Daemon).
	* See AUTHORS.md for complete list of NFD authors and contributors.
	*
	* NFD is free software: you can redistribute it and/or modify it under the terms
	* of the GNU General Public License as published by the Free Software Foundation,
	* either version 3 of the License, or (at your option) any later version.
	*
	* NFD 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 General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License along with
	* NFD, e.g., in COPYING.md file. If not, see <http://www.gnu.org/licenses/>.
	*/

	#include "command-authenticator.hpp"
	#include "core/logger.hpp"

	#include <ndn-cxx/tag.hpp>
	#include <ndn-cxx/security/v2/certificate-fetcher-offline.hpp>
	#include <ndn-cxx/security/v2/certificate-request.hpp>
	#include <ndn-cxx/security/v2/validation-policy.hpp>
	#include <ndn-cxx/security/v2/validation-policy-accept-all.hpp>
	#include <ndn-cxx/security/v2/validation-policy-command-interest.hpp>
	#include <ndn-cxx/security/v2/validator.hpp>
	#include <ndn-cxx/util/io.hpp>

	#include <boost/filesystem.hpp>

	namespace sec2 = ndn::security::v2;

	namespace nfd {

	NFD_LOG_INIT("CommandAuthenticator");
	// INFO: configuration change, etc
	// DEBUG: per authentication request result

	/** \brief an Interest tag to indicate command signer
	*/
	using SignerTag = ndn::SimpleTag<Name, 20>;

	/** \brief obtain signer from SignerTag attached to Interest, if available
	*/
	static optional<std::string>
	getSignerFromTag(const Interest& interest)
	{
	shared_ptr<SignerTag> signerTag = interest.getTag<SignerTag>();
	if (signerTag == nullptr) {
	return nullopt;
	}
	else {
	return signerTag->get().toUri();
	}
	}

	/** \brief a validation policy that only permits Interest signed by a trust anchor
	*/
	class CommandAuthenticatorValidationPolicy : public sec2::ValidationPolicy
	{
	public:
	void
	checkPolicy(const Interest& interest, const shared_ptr<sec2::ValidationState>& state,
	const ValidationContinuation& continueValidation) final
	{
	Name klName = getKeyLocatorName(interest, *state);
	if (!state->getOutcome()) { // already failed
	return;
	}

	// SignerTag must be placed on the 'original Interest' in ValidationState to be available for
	// InterestValidationSuccessCallback. The 'interest' parameter refers to a different instance
	// which is copied into 'original Interest'.
	auto state1 = dynamic_pointer_cast<sec2::InterestValidationState>(state);
	state1->getOriginalInterest().setTag(make_shared<SignerTag>(klName));

	continueValidation(make_shared<sec2::CertificateRequest>(Interest(klName)), state);
	}

	void
	checkPolicy(const Data& data, const shared_ptr<sec2::ValidationState>& state,
	const ValidationContinuation& continueValidation) final
	{
	// Non-certificate Data are not handled by CommandAuthenticator.
	// Non-anchor certificates cannot be retrieved by offline fetcher.
	BOOST_ASSERT_MSG(false, "Data should not be passed to this policy");
	}
	};

	shared_ptr<CommandAuthenticator>
	CommandAuthenticator::create()
	{
	return shared_ptr<CommandAuthenticator>(new CommandAuthenticator);
	}

	CommandAuthenticator::CommandAuthenticator() = default;

	void
	CommandAuthenticator::setConfigFile(ConfigFile& configFile)
	{
	configFile.addSectionHandler("authorizations",
	bind(&CommandAuthenticator::processConfig, this, _1, _2, _3));
	}

	void
	CommandAuthenticator::processConfig(const ConfigSection& section, bool isDryRun, const std::string& filename)
	{
	if (!isDryRun) {
	NFD_LOG_INFO("clear-authorizations");
	for (auto& kv : m_validators) {
	kv.second = make_shared<sec2::Validator>(
	make_unique<sec2::ValidationPolicyCommandInterest>(make_unique<CommandAuthenticatorValidationPolicy>()),
	make_unique<sec2::CertificateFetcherOffline>());
	}
	}

	if (section.empty()) {
	BOOST_THROW_EXCEPTION(ConfigFile::Error("'authorize' is missing under 'authorizations'"));
	}

	int authSectionIndex = 0;
	for (const auto& kv : section) {
	if (kv.first != "authorize") {
	BOOST_THROW_EXCEPTION(ConfigFile::Error(
	"'" + kv.first + "' section is not permitted under 'authorizations'"));
	}
	const ConfigSection& authSection = kv.second;

	std::string certfile;
	try {
	certfile = authSection.get<std::string>("certfile");
	}
	catch (const boost::property_tree::ptree_error&) {
	BOOST_THROW_EXCEPTION(ConfigFile::Error(
	"'certfile' is missing under authorize[" + to_string(authSectionIndex) + "]"));
	}

	bool isAny = false;
	shared_ptr<sec2::Certificate> cert;
	if (certfile == "any") {
	isAny = true;
	NFD_LOG_WARN("'certfile any' is intended for demo purposes only and "
	"SHOULD NOT be used in production environments");
	}
	else {
	using namespace boost::filesystem;
	path certfilePath = absolute(certfile, path(filename).parent_path());
	cert = ndn::io::load<sec2::Certificate>(certfilePath.string());
	if (cert == nullptr) {
	BOOST_THROW_EXCEPTION(ConfigFile::Error(
	"cannot load certfile " + certfilePath.string() +
	" for authorize[" + to_string(authSectionIndex) + "]"));
	}
	}

	const ConfigSection* privSection = nullptr;
	try {
	privSection = &authSection.get_child("privileges");
	}
	catch (const boost::property_tree::ptree_error&) {
	BOOST_THROW_EXCEPTION(ConfigFile::Error(
	"'privileges' is missing under authorize[" + to_string(authSectionIndex) + "]"));
	}

	if (privSection->empty()) {
	NFD_LOG_WARN("No privileges granted to certificate " << certfile);
	}
	for (const auto& kv : *privSection) {
	const std::string& module = kv.first;
	auto found = m_validators.find(module);
	if (found == m_validators.end()) {
	BOOST_THROW_EXCEPTION(ConfigFile::Error(
	"unknown module '" + module + "' under authorize[" + to_string(authSectionIndex) + "]"));
	}

	if (isDryRun) {
	continue;
	}

	if (isAny) {
	found->second = make_shared<sec2::Validator>(make_unique<sec2::ValidationPolicyAcceptAll>(),
	make_unique<sec2::CertificateFetcherOffline>());
	NFD_LOG_INFO("authorize module=" << module << " signer=any");
	}
	else {
	const Name& keyName = cert->getKeyName();
	sec2::Certificate certCopy = *cert;
	found->second->loadAnchor(certfile, std::move(certCopy));
	NFD_LOG_INFO("authorize module=" << module << " signer=" << keyName <<
	" certfile=" << certfile);
	}
	}

	++authSectionIndex;
	}
	}

	ndn::mgmt::Authorization
	CommandAuthenticator::makeAuthorization(const std::string& module, const std::string& verb)
	{
	m_validators[module]; // declares module, so that privilege is recognized

	auto self = this->shared_from_this();
	return [=] (const Name&, const Interest& interest,
	const ndn::mgmt::ControlParameters*,
	const ndn::mgmt::AcceptContinuation& accept,
	const ndn::mgmt::RejectContinuation& reject) {
	auto validator = self->m_validators.at(module);
	auto successCb = [accept, validator] (const Interest& interest1) {
	auto signer1 = getSignerFromTag(interest1);
	BOOST_ASSERT(signer1 \|\| // signer must be available unless 'certfile any'
	dynamic_cast<sec2::ValidationPolicyAcceptAll*>(&validator->getPolicy()) != nullptr);
	std::string signer = signer1.value_or("*");
	NFD_LOG_DEBUG("accept " << interest1.getName() << " signer=" << signer);
	accept(signer);
	};
	auto failureCb = [reject] (const Interest& interest1, const sec2::ValidationError& err) {
	using ndn::mgmt::RejectReply;
	RejectReply reply = RejectReply::STATUS403;
	switch (err.getCode()) {
	case sec2::ValidationError::NO_SIGNATURE:
	case sec2::ValidationError::INVALID_KEY_LOCATOR:
	reply = RejectReply::SILENT;
	break;
	case sec2::ValidationError::POLICY_ERROR:
	if (interest1.getName().size() < ndn::command_interest::MIN_SIZE) { // "name too short"
	reply = RejectReply::SILENT;
	}
	break;
	}
	NFD_LOG_DEBUG("reject " << interest1.getName() << " signer=" <<
	getSignerFromTag(interest1).value_or("?") << " reason=" << err);
	reject(reply);
	};

	if (validator) {
	validator->validate(interest, successCb, failureCb);
	}
	else {
	NFD_LOG_DEBUG("reject " << interest.getName() << " signer=" <<
	getSignerFromTag(interest).value_or("?") << " reason=Unauthorized");
	reject(ndn::mgmt::RejectReply::STATUS403);
	}
	};
	}

	} // namespace nfd