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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/**
* Copyright (c) 2013-2014, Regents of the University of California.
* All rights reserved.
*
* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
* See AUTHORS.md for complete list of ndn-cxx authors and contributors.
*
* This file licensed under New BSD License. See COPYING for detailed information about
* ndn-cxx library copyright, permissions, and redistribution restrictions.
*
* @author Yingdi Yu <http://irl.cs.ucla.edu/~yingdi/>
*/
#include "validator-config.hpp"
#include "certificate-cache-ttl.hpp"
#include "../util/io.hpp"
#include <boost/filesystem.hpp>
#include <boost/property_tree/info_parser.hpp>
#include <boost/algorithm/string.hpp>
namespace ndn {
const shared_ptr<CertificateCache> ValidatorConfig::DEFAULT_CERTIFICATE_CACHE;
ValidatorConfig::ValidatorConfig(Face& face,
const shared_ptr<CertificateCache>& certificateCache,
const int stepLimit)
: Validator(face)
, m_stepLimit(stepLimit)
, m_certificateCache(certificateCache)
{
if (!static_cast<bool>(m_certificateCache))
m_certificateCache = make_shared<CertificateCacheTtl>(m_face.ioService());
}
void
ValidatorConfig::load(const std::string& filename)
{
std::ifstream inputFile;
inputFile.open(filename.c_str());
if (!inputFile.good() || !inputFile.is_open())
{
std::string msg = "Failed to read configuration file: ";
msg += filename;
throw security::conf::Error(msg);
}
load(inputFile, filename);
inputFile.close();
}
void
ValidatorConfig::load(const std::string& input, const std::string& filename)
{
std::istringstream inputStream(input);
load(inputStream, filename);
}
void
ValidatorConfig::load(std::istream& input, const std::string& filename)
{
security::conf::ConfigSection tree;
try
{
boost::property_tree::read_info(input, tree);
}
catch (boost::property_tree::info_parser_error& error)
{
std::stringstream msg;
msg << "Failed to parse configuration file";
msg << " " << filename;
msg << " " << error.message() << " line " << error.line();
throw security::conf::Error(msg.str());
}
load(tree, filename);
}
void
ValidatorConfig::load(const security::conf::ConfigSection& configSection,
const std::string& filename)
{
BOOST_ASSERT(!filename.empty());
if (configSection.begin() == configSection.end())
{
std::string msg = "Error processing configuration file";
msg += ": ";
msg += filename;
msg += " no data";
throw security::conf::Error(msg);
}
for (security::conf::ConfigSection::const_iterator i = configSection.begin();
i != configSection.end(); ++i)
{
const std::string& sectionName = i->first;
const security::conf::ConfigSection& section = i->second;
if (boost::iequals(sectionName, "rule"))
{
onConfigRule(section, filename);
}
else if (boost::iequals(sectionName, "trust-anchor"))
{
onConfigTrustAnchor(section, filename);
}
else
{
std::string msg = "Error processing configuration file";
msg += " ";
msg += filename;
msg += " unrecognized section: " + sectionName;
throw security::conf::Error(msg);
}
}
}
void
ValidatorConfig::onConfigRule(const security::conf::ConfigSection& configSection,
const std::string& filename)
{
using namespace ndn::security::conf;
ConfigSection::const_iterator propertyIt = configSection.begin();
// Get rule.id
if (propertyIt == configSection.end() || !boost::iequals(propertyIt->first, "id"))
throw Error("Expect <rule.id>!");
std::string ruleId = propertyIt->second.data();
propertyIt++;
// Get rule.for
if (propertyIt == configSection.end() || !boost::iequals(propertyIt->first,"for"))
throw Error("Expect <rule.for> in rule: " + ruleId + "!");
std::string usage = propertyIt->second.data();
propertyIt++;
bool isForData;
if (boost::iequals(usage, "data"))
isForData = true;
else if (boost::iequals(usage, "interest"))
isForData = false;
else
throw Error("Unrecognized <rule.for>: " + usage
+ " in rule: " + ruleId);
// Get rule.filter(s)
std::vector<shared_ptr<Filter> > filters;
for (; propertyIt != configSection.end(); propertyIt++)
{
if (!boost::iequals(propertyIt->first, "filter"))
{
if (boost::iequals(propertyIt->first, "checker"))
break;
throw Error("Expect <rule.filter> in rule: " + ruleId);
}
filters.push_back(FilterFactory::create(propertyIt->second));
continue;
}
// Get rule.checker(s)
std::vector<shared_ptr<Checker> > checkers;
for (; propertyIt != configSection.end(); propertyIt++)
{
if (!boost::iequals(propertyIt->first, "checker"))
throw Error("Expect <rule.checker> in rule: " + ruleId);
checkers.push_back(CheckerFactory::create(propertyIt->second, filename));
continue;
}
// Check other stuff
if (propertyIt != configSection.end())
throw Error("Expect the end of rule: " + ruleId);
if (checkers.size() == 0)
throw Error("No <rule.checker> is specified in rule: " + ruleId);
if (isForData)
{
shared_ptr<DataRule> rule(new DataRule(ruleId));
for (size_t i = 0; i < filters.size(); i++)
rule->addFilter(filters[i]);
for (size_t i = 0; i < checkers.size(); i++)
rule->addChecker(checkers[i]);
m_dataRules.push_back(rule);
}
else
{
shared_ptr<InterestRule> rule(new InterestRule(ruleId));
for (size_t i = 0; i < filters.size(); i++)
rule->addFilter(filters[i]);
for (size_t i = 0; i < checkers.size(); i++)
rule->addChecker(checkers[i]);
m_interestRules.push_back(rule);
}
}
void
ValidatorConfig::onConfigTrustAnchor(const security::conf::ConfigSection& configSection,
const std::string& filename)
{
using namespace ndn::security::conf;
using namespace boost::filesystem;
ConfigSection::const_iterator propertyIt = configSection.begin();
// Get trust-anchor.type
if (propertyIt == configSection.end() || !boost::iequals(propertyIt->first, "type"))
throw Error("Expect <trust-anchor.type>!");
std::string type = propertyIt->second.data();
propertyIt++;
if (boost::iequals(type, "file"))
{
// Get trust-anchor.file
if (propertyIt == configSection.end() || !boost::iequals(propertyIt->first,"file-name"))
throw Error("Expect <trust-anchor.file-name>!");
std::string file = propertyIt->second.data();
propertyIt++;
// Check other stuff
if (propertyIt != configSection.end())
throw Error("Expect the end of trust-anchor!");
path certfilePath = absolute(file, path(filename).parent_path());
shared_ptr<IdentityCertificate> idCert =
io::load<IdentityCertificate>(certfilePath.string());
if (static_cast<bool>(idCert))
{
BOOST_ASSERT(idCert->getName().size() >= 1);
m_anchors[idCert->getName().getPrefix(-1)] = idCert;
}
else
throw Error("Cannot read certificate from file: " +
certfilePath.native());
return;
}
else if (boost::iequals(type, "base64"))
{
// Get trust-anchor.base64-string
if (propertyIt == configSection.end() || !boost::iequals(propertyIt->first, "base64-string"))
throw Error("Expect <trust-anchor.base64-string>!");
std::stringstream ss(propertyIt->second.data());
propertyIt++;
// Check other stuff
if (propertyIt != configSection.end())
throw Error("Expect the end of trust-anchor!");
shared_ptr<IdentityCertificate> idCert = io::load<IdentityCertificate>(ss);
if (static_cast<bool>(idCert))
{
BOOST_ASSERT(idCert->getName().size() >= 1);
m_anchors[idCert->getName().getPrefix(-1)] = idCert;
}
else
throw Error("Cannot decode certificate from base64-string");
return;
}
else
throw Error("Unsupported trust-anchor.type: " + type);
}
void
ValidatorConfig::checkPolicy(const Data& data,
int nSteps,
const OnDataValidated& onValidated,
const OnDataValidationFailed& onValidationFailed,
std::vector<shared_ptr<ValidationRequest> >& nextSteps)
{
if (m_stepLimit == nSteps)
return onValidationFailed(data.shared_from_this(),
"Maximum steps of validation reached");
bool isMatched = false;
int8_t checkResult = -1;
for (DataRuleList::iterator it = m_dataRules.begin();
it != m_dataRules.end(); it++)
{
if ((*it)->match(data))
{
isMatched = true;
checkResult = (*it)->check(data, onValidated, onValidationFailed);
break;
}
}
if (!isMatched)
return onValidationFailed(data.shared_from_this(), "No rule matched!");
if (checkResult == 0)
{
const Signature& signature = data.getSignature();
checkSignature(data, signature, nSteps,
onValidated, onValidationFailed, nextSteps);
}
}
void
ValidatorConfig::checkPolicy(const Interest& interest,
int nSteps,
const OnInterestValidated& onValidated,
const OnInterestValidationFailed& onValidationFailed,
std::vector<shared_ptr<ValidationRequest> >& nextSteps)
{
if (m_stepLimit == nSteps)
return onValidationFailed(interest.shared_from_this(),
"Maximum steps of validation reached");
bool isMatched = false;
int8_t checkResult = -1;
for (InterestRuleList::iterator it = m_interestRules.begin();
it != m_interestRules.end(); it++)
{
if ((*it)->match(interest))
{
isMatched = true;
checkResult = (*it)->check(interest, onValidated, onValidationFailed);
break;
}
}
if (!isMatched)
return onValidationFailed(interest.shared_from_this(), "No rule matched!");
if (checkResult == 0)
{
const Name& interestName = interest.getName();
Name signedName = interestName.getPrefix(-2);
Signature signature(interestName[-2].blockFromValue(),
interestName[-1].blockFromValue());
checkSignature(interest, signature, nSteps,
onValidated, onValidationFailed, nextSteps);
}
}
} // namespace ndn