Junxiao Shi | dc2d6d2 | 2016-08-04 14:30:23 +0000 | [diff] [blame] | 1 | /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */ |
| 2 | /** |
| 3 | * Copyright (c) 2013-2016 Regents of the University of California. |
| 4 | * |
| 5 | * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions). |
| 6 | * |
| 7 | * ndn-cxx library is free software: you can redistribute it and/or modify it under the |
| 8 | * terms of the GNU Lesser General Public License as published by the Free Software |
| 9 | * Foundation, either version 3 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY |
| 12 | * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A |
| 13 | * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. |
| 14 | * |
| 15 | * You should have received copies of the GNU General Public License and GNU Lesser |
| 16 | * General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see |
| 17 | * <http://www.gnu.org/licenses/>. |
| 18 | * |
| 19 | * See AUTHORS.md for complete list of ndn-cxx authors and contributors. |
| 20 | */ |
| 21 | |
| 22 | #include "command-interest-validator.hpp" |
Alexander Afanasyev | 2fa5939 | 2016-07-29 17:24:23 -0700 | [diff] [blame^] | 23 | #include "v1/identity-certificate.hpp" |
Junxiao Shi | dc2d6d2 | 2016-08-04 14:30:23 +0000 | [diff] [blame] | 24 | #include <boost/lexical_cast.hpp> |
| 25 | |
| 26 | namespace ndn { |
| 27 | namespace security { |
| 28 | |
| 29 | std::ostream& |
| 30 | operator<<(std::ostream& os, CommandInterestValidator::ErrorCode error) |
| 31 | { |
| 32 | switch (error) { |
| 33 | case CommandInterestValidator::ErrorCode::NONE: |
| 34 | return os << "OK"; |
| 35 | case CommandInterestValidator::ErrorCode::NAME_TOO_SHORT: |
| 36 | return os << "command Interest name is too short"; |
| 37 | case CommandInterestValidator::ErrorCode::BAD_TIMESTAMP: |
| 38 | return os << "cannot parse timestamp"; |
| 39 | case CommandInterestValidator::ErrorCode::BAD_SIG_INFO: |
| 40 | return os << "cannot parse SignatureInfo"; |
| 41 | case CommandInterestValidator::ErrorCode::MISSING_KEY_LOCATOR: |
| 42 | return os << "KeyLocator is missing"; |
| 43 | case CommandInterestValidator::ErrorCode::BAD_KEY_LOCATOR_TYPE: |
| 44 | return os << "KeyLocator type is not Name"; |
| 45 | case CommandInterestValidator::ErrorCode::BAD_CERT_NAME: |
| 46 | return os << "cannot parse certificate name"; |
| 47 | case CommandInterestValidator::ErrorCode::TIMESTAMP_OUT_OF_GRACE: |
| 48 | return os << "timestamp is out of grace period"; |
| 49 | case CommandInterestValidator::ErrorCode::TIMESTAMP_REORDER: |
| 50 | return os << "timestamp is less than or equal to last timestamp"; |
| 51 | } |
| 52 | return os; |
| 53 | } |
| 54 | |
| 55 | static void |
| 56 | invokeReject(const OnInterestValidationFailed& reject, const Interest& interest, |
| 57 | CommandInterestValidator::ErrorCode error) |
| 58 | { |
| 59 | reject(interest.shared_from_this(), boost::lexical_cast<std::string>(error)); |
| 60 | } |
| 61 | |
| 62 | CommandInterestValidator::CommandInterestValidator(unique_ptr<Validator> inner, |
| 63 | const Options& options) |
| 64 | : m_inner(std::move(inner)) |
| 65 | , m_options(options) |
| 66 | , m_index(m_container.get<0>()) |
| 67 | , m_queue(m_container.get<1>()) |
| 68 | { |
| 69 | if (m_inner == nullptr) { |
| 70 | BOOST_THROW_EXCEPTION(std::invalid_argument("inner validator is nullptr")); |
| 71 | } |
| 72 | |
| 73 | m_options.gracePeriod = std::max(m_options.gracePeriod, time::nanoseconds::zero()); |
| 74 | } |
| 75 | |
| 76 | void |
| 77 | CommandInterestValidator::checkPolicy(const Interest& interest, int nSteps, |
| 78 | const OnInterestValidated& accept, |
| 79 | const OnInterestValidationFailed& reject, |
| 80 | std::vector<shared_ptr<ValidationRequest>>& nextSteps) |
| 81 | { |
| 82 | BOOST_ASSERT(nSteps == 0); |
| 83 | this->cleanup(); |
| 84 | |
| 85 | Name keyName; |
| 86 | uint64_t timestamp; |
| 87 | ErrorCode res = this->parseCommandInterest(interest, keyName, timestamp); |
| 88 | if (res != ErrorCode::NONE) { |
| 89 | return invokeReject(reject, interest, res); |
| 90 | } |
| 91 | |
| 92 | time::system_clock::TimePoint receiveTime = time::system_clock::now(); |
| 93 | |
| 94 | m_inner->validate(interest, |
| 95 | [=] (const shared_ptr<const Interest>& interest) { |
| 96 | ErrorCode res = this->checkTimestamp(keyName, timestamp, receiveTime); |
| 97 | if (res != ErrorCode::NONE) { |
| 98 | return invokeReject(reject, *interest, res); |
| 99 | } |
| 100 | accept(interest); |
| 101 | }, reject); |
| 102 | } |
| 103 | |
| 104 | void |
| 105 | CommandInterestValidator::cleanup() |
| 106 | { |
| 107 | time::steady_clock::TimePoint expiring = time::steady_clock::now() - m_options.timestampTtl; |
| 108 | |
| 109 | while ((!m_queue.empty() && m_queue.front().lastRefreshed <= expiring) || |
| 110 | (m_options.maxTimestamps >= 0 && |
| 111 | m_queue.size() > static_cast<size_t>(m_options.maxTimestamps))) { |
| 112 | m_queue.pop_front(); |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | CommandInterestValidator::ErrorCode |
| 117 | CommandInterestValidator::parseCommandInterest(const Interest& interest, Name& keyName, |
| 118 | uint64_t& timestamp) const |
| 119 | { |
| 120 | const Name& name = interest.getName(); |
| 121 | if (name.size() < signed_interest::MIN_LENGTH) { |
| 122 | return ErrorCode::NAME_TOO_SHORT; |
| 123 | } |
| 124 | |
| 125 | const name::Component& timestampComp = name[signed_interest::POS_TIMESTAMP]; |
| 126 | if (!timestampComp.isNumber()) { |
| 127 | return ErrorCode::BAD_TIMESTAMP; |
| 128 | } |
| 129 | timestamp = timestampComp.toNumber(); |
| 130 | |
| 131 | SignatureInfo sig; |
| 132 | try { |
| 133 | sig.wireDecode(name[signed_interest::POS_SIG_INFO].blockFromValue()); |
| 134 | } |
| 135 | catch (const tlv::Error&) { |
| 136 | return ErrorCode::BAD_SIG_INFO; |
| 137 | } |
| 138 | |
| 139 | if (!sig.hasKeyLocator()) { |
| 140 | return ErrorCode::MISSING_KEY_LOCATOR; |
| 141 | } |
| 142 | |
| 143 | const KeyLocator& keyLocator = sig.getKeyLocator(); |
| 144 | if (keyLocator.getType() != KeyLocator::KeyLocator_Name) { |
| 145 | return ErrorCode::BAD_KEY_LOCATOR_TYPE; |
| 146 | } |
| 147 | |
| 148 | try { |
Alexander Afanasyev | 2fa5939 | 2016-07-29 17:24:23 -0700 | [diff] [blame^] | 149 | keyName = v1::IdentityCertificate::certificateNameToPublicKeyName(keyLocator.getName()); |
Junxiao Shi | dc2d6d2 | 2016-08-04 14:30:23 +0000 | [diff] [blame] | 150 | } |
Alexander Afanasyev | 2fa5939 | 2016-07-29 17:24:23 -0700 | [diff] [blame^] | 151 | catch (const v1::IdentityCertificate::Error&) { |
Junxiao Shi | dc2d6d2 | 2016-08-04 14:30:23 +0000 | [diff] [blame] | 152 | return ErrorCode::BAD_CERT_NAME; |
| 153 | } |
| 154 | |
| 155 | return ErrorCode::NONE; |
| 156 | } |
| 157 | |
| 158 | CommandInterestValidator::ErrorCode |
| 159 | CommandInterestValidator::checkTimestamp(const Name& keyName, uint64_t timestamp, |
| 160 | time::system_clock::TimePoint receiveTime) |
| 161 | { |
| 162 | time::steady_clock::TimePoint now = time::steady_clock::now(); |
| 163 | |
| 164 | // try to insert new record |
| 165 | Queue::iterator i = m_queue.end(); |
| 166 | bool isNew = false; |
| 167 | std::tie(i, isNew) = m_queue.push_back({keyName, timestamp, now}); |
| 168 | |
| 169 | if (isNew) { |
| 170 | // check grace period |
| 171 | time::system_clock::TimePoint sigTime = time::fromUnixTimestamp(time::milliseconds(timestamp)); |
| 172 | if (time::abs(sigTime - receiveTime) > m_options.gracePeriod) { |
| 173 | // out of grace period, delete new record |
| 174 | m_queue.erase(i); |
| 175 | return ErrorCode::TIMESTAMP_OUT_OF_GRACE; |
| 176 | } |
| 177 | } |
| 178 | else { |
| 179 | BOOST_ASSERT(i->keyName == keyName); |
| 180 | |
| 181 | // compare timestamp with last timestamp |
| 182 | if (timestamp <= i->timestamp) { |
| 183 | return ErrorCode::TIMESTAMP_REORDER; |
| 184 | } |
| 185 | |
| 186 | // set lastRefreshed field, and move to queue tail |
| 187 | m_queue.erase(i); |
| 188 | isNew = m_queue.push_back({keyName, timestamp, now}).second; |
| 189 | BOOST_ASSERT(isNew); |
| 190 | } |
| 191 | |
| 192 | return ErrorCode::NONE; |
| 193 | } |
| 194 | |
| 195 | void |
| 196 | CommandInterestValidator::checkPolicy(const Data& data, int nSteps, |
| 197 | const OnDataValidated& accept, |
| 198 | const OnDataValidationFailed& reject, |
| 199 | std::vector<shared_ptr<ValidationRequest>>& nextSteps) |
| 200 | { |
| 201 | BOOST_ASSERT(nSteps == 0); |
| 202 | m_inner->validate(data, accept, reject); |
| 203 | } |
| 204 | |
| 205 | } // namespace security |
| 206 | } // namespace ndn |