Add and send certificates of representation to tell people what our valid upstreams are. These are not used yet but will be needed for future privacy modes, etc. Also some cleanup.

node/CertificateOfRepresentation.hpp

@@ -0,0 +1,161 @@
+/*
+ * ZeroTier One - Network Virtualization Everywhere
+ * Copyright (C) 2011-2016  ZeroTier, Inc.  https://www.zerotier.com/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef ZT_CERTIFICATEOFREPRESENTATION_HPP
+#define ZT_CERTIFICATEOFREPRESENTATION_HPP
+
+#include "Constants.hpp"
+#include "Address.hpp"
+#include "C25519.hpp"
+#include "Identity.hpp"
+#include "Buffer.hpp"
+
+/**
+ * Maximum number of addresses allowed in a COR
+ */
+#define ZT_CERTIFICATEOFREPRESENTATION_MAX_ADDRESSES ZT_MAX_UPSTREAMS
+
+namespace ZeroTier {
+
+class CertificateOfRepresentation
+{
+public:
+	CertificateOfRepresentation()
+	{
+		memset(this,0,sizeof(CertificateOfRepresentation));
+	}
+
+	inline uint64_t timestamp() const { return _timestamp; }
+	inline const Address &representative(const unsigned int i) const { return _reps[i]; }
+	inline unsigned int repCount() const { return _repCount; }
+
+	inline void clear()
+	{
+		memset(this,0,sizeof(CertificateOfRepresentation));
+	}
+
+	/**
+	 * Add a representative if space remains
+	 *
+	 * @param r Representative to add
+	 * @return True if representative was added
+	 */
+	inline bool addRepresentative(const Address &r)
+	{
+		if (_repCount < ZT_CERTIFICATEOFREPRESENTATION_MAX_ADDRESSES) {
+			_reps[_repCount++] = r;
+			return true;
+		}
+		return false;
+	}
+
+	/**
+	 * Sign this COR with my identity
+	 *
+	 * @param myIdentity This node's identity
+	 * @param ts COR timestamp for establishing new vs. old
+	 */
+	inline void sign(const Identity &myIdentity,const uint64_t ts)
+	{
+		_timestamp = ts;
+		Buffer<sizeof(CertificateOfRepresentation) + 32> tmp;
+		this->serialize(tmp,true);
+		_signature = myIdentity.sign(tmp.data(),tmp.size());
+	}
+
+	/**
+	 * Verify this COR's signature
+	 *
+	 * @param senderIdentity Identity of sender of COR
+	 * @return True if COR is valid
+	 */
+	inline bool verify(const Identity &senderIdentity)
+	{
+		try {
+			Buffer<sizeof(CertificateOfRepresentation) + 32> tmp;
+			this->serialize(tmp,true);
+			return senderIdentity.verify(tmp.data(),tmp.size(),_signature.data,ZT_C25519_SIGNATURE_LEN);
+		} catch ( ... ) {
+			return false;
+		}
+	}
+
+	template<unsigned int C>
+	inline void serialize(Buffer<C> &b,const bool forSign = false) const
+	{
+		if (forSign) b.append((uint64_t)0x7f7f7f7f7f7f7f7fULL);
+
+		b.append((uint64_t)_timestamp);
+		b.append((uint16_t)_repCount);
+		for(unsigned int i=0;i<_repCount;++i)
+			_reps[i].appendTo(b);
+
+		if (!forSign) {
+			b.append((uint8_t)1); // 1 == Ed25519 signature
+			b.append((uint16_t)ZT_C25519_SIGNATURE_LEN);
+			b.append(_signature.data,ZT_C25519_SIGNATURE_LEN);
+		}
+
+		b.append((uint16_t)0); // size of any additional fields, currently 0
+
+		if (forSign) b.append((uint64_t)0x7f7f7f7f7f7f7f7fULL);
+	}
+
+	template<unsigned int C>
+	inline unsigned int deserialize(const Buffer<C> &b,unsigned int startAt = 0)
+	{
+		clear();
+
+		unsigned int p = startAt;
+
+		_timestamp = b.template at<uint64_t>(p); p += 8;
+		const unsigned int rc = b.template at<uint16_t>(p); p += 2;
+		for(unsigned int i=0;i<rc;++i) {
+			if (i < ZT_CERTIFICATEOFREPRESENTATION_MAX_ADDRESSES)
+				_reps[i].setTo(b.field(p,ZT_ADDRESS_LENGTH),ZT_ADDRESS_LENGTH);
+			p += ZT_ADDRESS_LENGTH;
+		}
+		_repCount = (rc > ZT_CERTIFICATEOFREPRESENTATION_MAX_ADDRESSES) ? ZT_CERTIFICATEOFREPRESENTATION_MAX_ADDRESSES : rc;
+
+		if (b[p++] == 1) {
+			if (b.template at<uint16_t>(p) == ZT_C25519_SIGNATURE_LEN) {
+				p += 2;
+				memcpy(_signature.data,b.field(p,ZT_C25519_SIGNATURE_LEN),ZT_C25519_SIGNATURE_LEN);
+				p += ZT_C25519_SIGNATURE_LEN;
+			} else throw std::runtime_error("invalid signature");
+		} else {
+			p += 2 + b.template at<uint16_t>(p);
+		}
+
+		p += 2 + b.template at<uint16_t>(p);
+		if (p > b.size())
+			throw std::runtime_error("extended field overflow");
+
+		return (p - startAt);
+	}
+
+private:
+	uint64_t _timestamp;
+	Address _reps[ZT_CERTIFICATEOFREPRESENTATION_MAX_ADDRESSES];
+	unsigned int _repCount;
+	C25519::Signature _signature;
+};
+
+} // namespace ZeroTier
+
+#endif