Access Manager

Change-Id: I5febe225dc8ba2f7967dabb5e1bf0bab6428d6c2
diff --git a/src/access-manager.cpp b/src/access-manager.cpp
new file mode 100644
index 0000000..056ef33
--- /dev/null
+++ b/src/access-manager.cpp
@@ -0,0 +1,128 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014-2018, Regents of the University of California
+ *
+ * NAC 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
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * NAC library 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 Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of NAC library authors and contributors.
+ */
+
+#include "access-manager.hpp"
+#include "encrypted-content.hpp"
+
+#include <ndn-cxx/util/logger.hpp>
+
+NDN_LOG_INIT(nac.AccessManager);
+
+namespace ndn {
+namespace nac {
+
+AccessManager::AccessManager(const Identity& identity, const Name& dataset,
+                             KeyChain& keyChain, Face& face)
+  : m_identity(identity)
+  , m_keyChain(keyChain)
+  , m_face(face)
+{
+  // NAC Identity: <identity>/NAC/<dataset>
+  // generate NAC key
+  auto nacId = m_keyChain.createIdentity(Name(identity.getName()).append(NAC).append(dataset), RsaKeyParams());
+  m_nacKey = nacId.getDefaultKey();
+  if (m_nacKey.getKeyType() != KeyType::RSA) {
+    NDN_LOG_INFO("Cannot re-use existing KEK/KDK pair, as it is not an RSA key, regenerating");
+    m_nacKey = m_keyChain.createKey(nacId, RsaKeyParams());
+  }
+  auto nacKeyId = m_nacKey.getName().at(-1);
+
+  auto kekPrefix = Name(m_nacKey.getIdentity()).append(KEK);
+
+  auto kek = make_shared<Data>(m_nacKey.getDefaultCertificate());
+  kek->setName(Name(kekPrefix).append(nacKeyId));
+  m_keyChain.sign(*kek, signingByIdentity(m_identity));
+  // kek looks like a cert, but doesn't have ValidityPeriod
+  m_ims.insert(*kek);
+
+  auto serveFromIms = [this] (const Name& prefix, const Interest& interest) {
+    auto data = m_ims.find(interest);
+    if (data != nullptr) {
+      NDN_LOG_DEBUG("Serving " << data->getName() << " from InMemoryStorage");
+      m_face.put(*data);
+    }
+    else {
+      NDN_LOG_DEBUG("Didn't find data for " << interest.getName());
+      // send NACK?
+    }
+  };
+
+  auto handleError = [] (const Name& prefix, const std::string& msg) {
+    NDN_LOG_ERROR("Failed to register prefix " << prefix << ": " << msg);
+  };
+
+  m_kekRegId = m_face.setInterestFilter(kekPrefix, serveFromIms, handleError);
+
+  auto kdkPrefix = Name(m_nacKey.getIdentity()).append(KDK).append(nacKeyId);
+  m_kdkRegId = m_face.setInterestFilter(kdkPrefix, serveFromIms, handleError);
+}
+
+AccessManager::~AccessManager()
+{
+  m_face.unsetInterestFilter(m_kekRegId);
+  m_face.unsetInterestFilter(m_kdkRegId);
+}
+
+void
+AccessManager::addMember(const Certificate& memberCert)
+{
+  Name kdkName(m_nacKey.getIdentity());
+  kdkName
+    .append(KDK)
+    .append(m_nacKey.getName().at(-1)) // key-id
+    .append(ENCRYPTED_BY)
+    .append(memberCert.getKeyName());
+
+  const size_t secretLength = 32;
+  uint8_t secret[secretLength + 1];
+  random::generateSecureBytes(secret, secretLength);
+  // because of stupid bug in ndn-cxx, remove all \0 in generated secret, replace with 1
+  for (size_t i = 0; i < secretLength; ++i) {
+    if (secret[i] == 0) {
+      secret[i] = 1;
+    }
+  }
+  secret[secretLength] = 0;
+
+  auto kdkData = m_keyChain.exportSafeBag(m_nacKey.getDefaultCertificate(),
+                                          reinterpret_cast<const char*>(secret), secretLength);
+
+  PublicKey memberKey;
+  memberKey.loadPkcs8(memberCert.getPublicKey().data(), memberCert.getPublicKey().size());
+
+  EncryptedContent content;
+  content.setPayload(kdkData->wireEncode());
+  content.setPayloadKey(memberKey.encrypt(secret, secretLength));
+
+  auto kdk = make_shared<Data>(kdkName);
+  kdk->setContent(content.wireEncode());
+  kdk->setFreshnessPeriod(1_h); // this can serve as soft access control for revoking access
+  m_keyChain.sign(*kdk, signingByIdentity(m_identity));
+
+  m_ims.insert(*kdk);
+}
+
+void
+AccessManager::removeMember(const Name& identity)
+{
+  m_ims.erase(Name(m_nacKey.getName()).append(KDK).append(ENCRYPTED_BY).append(identity));
+}
+
+} // namespace nac
+} // namespace ndn