Temporarily DISABLE multicast authentication (doing in branch, will reenable in dev)

node/Network.hpp

@@ -357,6 +357,14 @@ public:
 		return std::set<InetAddress>();
 	}
 
+	/**
+	 * @return True if multicasts must be authenticated on this network
+	 */
+	inline bool authenticateMulticasts() const
+	{
+		return false;
+	}
+
 	/**
 	 * Shortcut for config()->permitsBridging(), returns false if no config
 	 *

node/PacketDecoder.cpp

@@ -612,10 +612,16 @@ bool PacketDecoder::_doMULTICAST_FRAME(const RuntimeEnvironment *_r,const Shared
 
 		// Check the multicast frame's signature to verify that its original sender is
 		// who it claims to be.
-		const unsigned int signedPartLen = (ZT_PROTO_VERB_MULTICAST_FRAME_IDX_FRAME - ZT_PROTO_VERB_MULTICAST_FRAME_IDX__START_OF_SIGNED_PORTION) + frameLen;
-		if (!originPeer->identity().verify(field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX__START_OF_SIGNED_PORTION,signedPartLen),signedPartLen,signature,signatureLen)) {
-			LOG("dropped MULTICAST_FRAME from %s(%s): failed signature verification, claims to be from %s",source().toString().c_str(),_remoteAddress.toString().c_str(),origin.toString().c_str());
-			return true;
+		if ((!network)||(network->authenticateMulticasts())) {
+			// Note that right now we authenticate multicasts if we aren't a member of a
+			// network... have to think about whether this is mandatory. It mostly only
+			// matters for supernodes though, since ordinary peers are unlikely ever to
+			// see multicasts for networks they don't belong to.
+			const unsigned int signedPartLen = (ZT_PROTO_VERB_MULTICAST_FRAME_IDX_FRAME - ZT_PROTO_VERB_MULTICAST_FRAME_IDX__START_OF_SIGNED_PORTION) + frameLen;
+			if (!originPeer->identity().verify(field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX__START_OF_SIGNED_PORTION,signedPartLen),signedPartLen,signature,signatureLen)) {
+				LOG("dropped MULTICAST_FRAME from %s(%s): failed signature verification, claims to be from %s",source().toString().c_str(),_remoteAddress.toString().c_str(),origin.toString().c_str());
+				return true;
+			}
 		}
 
 		// Security check to prohibit multicasts that are really Ethernet unicasts...

node/Switch.cpp

@@ -213,9 +213,13 @@ void Switch::onLocalEthernet(const SharedPtr<Network> &network,const MAC &from,c
 			outp.append((uint16_t)data.size());
 			outp.append(data);
 
-			C25519::Signature sig(_r->identity.sign(outp.field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX__START_OF_SIGNED_PORTION,signedPartLen),signedPartLen));
-			outp.append((uint16_t)sig.size());
-			outp.append(sig.data,(unsigned int)sig.size());
+			if (network->authenticateMulticasts()) {
+				C25519::Signature sig(_r->identity.sign(outp.field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX__START_OF_SIGNED_PORTION,signedPartLen),signedPartLen));
+				outp.append((uint16_t)sig.size());
+				outp.append(sig.data,(unsigned int)sig.size());
+			} else {
+				outp.append((uint16_t)0);
+			}
 
 			// FIXME: now we send the netconf cert with every single multicast,
 			// which pretty much ensures everyone has it ahead of time but adds