sec-rule-relative.cpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#include "common.hpp"

#include "sec-rule-relative.hpp"

#include "signature-sha256-with-rsa.hpp"
#include "security-common.hpp"

namespace ndn {

using std::string;

SecRuleRelative::SecRuleRelative(const string& dataRegex, const string& signerRegex,
                                 const string& op,
                                 const string& dataExpand, const string& signerExpand,
                                 bool isPositive)
  : SecRule(isPositive),
    m_dataRegex(dataRegex),
    m_signerRegex(signerRegex),
    m_op(op),
    m_dataExpand(dataExpand),
    m_signerExpand(signerExpand),
    m_dataNameRegex(dataRegex, dataExpand),
    m_signerNameRegex(signerRegex, signerExpand)
{
  if (op != ">" && op != ">=" && op != "==")
    BOOST_THROW_EXCEPTION(Error("op is wrong"));
}

SecRuleRelative::~SecRuleRelative()
{
}

bool
SecRuleRelative::satisfy(const Data& data)
{
  Name dataName = data.getName();
  try
    {
      if (!data.getSignature().hasKeyLocator())
        return false;

      const KeyLocator& keyLocator = data.getSignature().getKeyLocator();
      if (keyLocator.getType() != KeyLocator::KeyLocator_Name)
        return false;

      const Name& signerName = keyLocator.getName();
      return satisfy(dataName, signerName);
    }
  catch (tlv::Error& e)
    {
      return false;
    }
  catch (RegexMatcher::Error& e)
    {
      return false;
    }
}

bool
SecRuleRelative::satisfy(const Name& dataName, const Name& signerName)
{
  if (!m_dataNameRegex.match(dataName))
    return false;
  Name expandDataName = m_dataNameRegex.expand();

  if (!m_signerNameRegex.match(signerName))
    return false;
  Name expandSignerName =  m_signerNameRegex.expand();

  bool matched = compare(expandDataName, expandSignerName);

  return matched;
}

bool
SecRuleRelative::matchDataName(const Data& data)
{
  return m_dataNameRegex.match(data.getName());
}

bool
SecRuleRelative::matchSignerName(const Data& data)
{
  try
    {
      if (!data.getSignature().hasKeyLocator())
        return false;

      const KeyLocator& keyLocator = data.getSignature().getKeyLocator();
      if (keyLocator.getType() != KeyLocator::KeyLocator_Name)
        return false;

      const Name& signerName = keyLocator.getName();
      return m_signerNameRegex.match(signerName);
    }
  catch (tlv::Error& e)
    {
      return false;
    }
  catch (RegexMatcher::Error& e)
    {
      return false;
    }
}

bool
SecRuleRelative::compare(const Name& dataName, const Name& signerName)
{
  if ((dataName == signerName) && ("==" == m_op || ">=" == m_op))
    return true;

  Name::const_iterator i = dataName.begin();
  Name::const_iterator j = signerName.begin();

  for (; i != dataName.end() && j != signerName.end(); i++, j++)
    {
      if (i->compare(*j) == 0)
        continue;
      else
        return false;
    }

  if (i == dataName.end())
    return false;
  else
    return true;
}

} // namespace ndn