validation-policy-signed-interest.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2013-2023 Regents of the University of California.
 *
 * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
 *
 * ndn-cxx library is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free Software
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 * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
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 * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
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#ifndef NDN_CXX_SECURITY_VALIDATION_POLICY_SIGNED_INTEREST_HPP
#define NDN_CXX_SECURITY_VALIDATION_POLICY_SIGNED_INTEREST_HPP
 
#include "ndn-cxx/security/validation-policy.hpp"
 
#include <boost/multi_index_container.hpp>
#include <boost/multi_index/hashed_index.hpp>
#include <boost/multi_index/key_extractors.hpp>
#include <boost/multi_index/ordered_index.hpp>
#include <boost/multi_index/sequenced_index.hpp>
 
namespace ndn::security {
 
class ValidationPolicySignedInterest : public ValidationPolicy
{
private:
  using SigNonce = std::vector<uint8_t>;
  struct NonceSet {};
  struct NonceList {};
 
public:
  class Options
  {
  public:
    Options()
    {
    }
 
  public:
    bool shouldValidateTimestamps = true;
 
    time::nanoseconds timestampGracePeriod = 2_min;
 
    bool shouldValidateSeqNums = false;
 
    bool shouldValidateNonces = true;
 
    ssize_t maxNonceRecordCount = 1000;
 
    ssize_t maxRecordCount = 1000;
  };
 
  explicit
  ValidationPolicySignedInterest(unique_ptr<ValidationPolicy> inner, const Options& options = {});
 
protected:
  void
  checkPolicy(const Data& data, const shared_ptr<ValidationState>& state,
              const ValidationContinuation& continueValidation) override;
 
  void
  checkPolicy(const Interest& interest, const shared_ptr<ValidationState>& state,
              const ValidationContinuation& continueValidation) override;
 
private:
  bool
  checkIncomingInterest(const shared_ptr<ValidationState>& state, const Interest& interest);
 
  void
  insertRecord(const Name& keyName,
               std::optional<time::system_clock::time_point> timestamp,
               std::optional<uint64_t> seqNum,
               std::optional<SigNonce> nonce);
 
private:
  Options m_options;
 
  using NonceContainer = boost::multi_index_container<
    SigNonce,
    boost::multi_index::indexed_by<
      boost::multi_index::hashed_unique<
        boost::multi_index::tag<NonceSet>,
        boost::multi_index::identity<SigNonce>
      >,
      boost::multi_index::sequenced<
        boost::multi_index::tag<NonceList>
      >
    >
  >;
 
  struct LastInterestRecord
  {
    LastInterestRecord(const Name& keyName,
                       std::optional<time::system_clock::time_point> timestamp,
                       std::optional<uint64_t> seqNum)
      : keyName(keyName)
      , timestamp(timestamp)
      , seqNum(seqNum)
      , lastRefreshed(time::steady_clock::now())
    {
    }
 
    Name keyName;
    std::optional<time::system_clock::time_point> timestamp;
    std::optional<uint64_t> seqNum;
    NonceContainer observedNonces;
    time::steady_clock::time_point lastRefreshed;
  };
 
  using Container = boost::multi_index_container<
    LastInterestRecord,
    boost::multi_index::indexed_by<
      boost::multi_index::ordered_unique<
        boost::multi_index::member<LastInterestRecord, Name, &LastInterestRecord::keyName>
      >,
      boost::multi_index::ordered_non_unique<
        boost::multi_index::member<LastInterestRecord, time::steady_clock::time_point,
                                   &LastInterestRecord::lastRefreshed>
      >
    >
  >;
 
  Container m_container;
  Container::nth_index<0>::type& m_byKeyName;
  Container::nth_index<1>::type& m_byLastRefreshed;
};
 
} // namespace ndn::security
 
#endif // NDN_CXX_SECURITY_VALIDATION_POLICY_SIGNED_INTEREST_HPP