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Re-added ECDSA support in Windows agent.

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Ylian Saint-Hilaire 2018-12-15 12:34:55 -08:00
parent c7887b5484
commit 65bdb1ec17
9 changed files with 21 additions and 11 deletions
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29
meshagent.js
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@ -197,8 +197,13 @@ module.exports.CreateMeshAgent = function (parent, db, ws, req, args, domain) {
if ((msg.length != 98) || ((obj.receivedCommands & 1) != 0)) return;
obj.receivedCommands += 1; // Agent can't send the same command twice on the same connection ever. Block DOS attack path.
// Check that the server hash matches our own web certificate hash (SHA384)
if ((getWebCertHash(obj.domain) != msg.substring(2, 50)) && (getWebCertFullHash(obj.domain) != msg.substring(2, 50))) { console.log('Agent bad web cert hash (Agent:' + (new Buffer(msg.substring(2, 50), 'binary').toString('hex').substring(0, 10)) + ' != Server:' + (new Buffer(getWebCertHash(obj.domain), 'binary').toString('hex').substring(0, 10)) + ' or ' + (new Buffer(getWebCertFullHash(obj.domain), 'binary').toString('hex').substring(0, 10)) + '), holding connection (' + obj.remoteaddrport + ').'); return; }
if (obj.args.ignoreagenthashcheck === true) {
// Send the agent web hash back to the agent
obj.send(obj.common.ShortToStr(1) + msg.substring(2, 50) + obj.nonce); // Command 1, hash + nonce. Use the web hash given by the agent.
} else {
// Check that the server hash matches our own web certificate hash (SHA384)
if ((getWebCertHash(obj.domain) != msg.substring(2, 50)) && (getWebCertFullHash(obj.domain) != msg.substring(2, 50))) { console.log('Agent bad web cert hash (Agent:' + (new Buffer(msg.substring(2, 50), 'binary').toString('hex').substring(0, 10)) + ' != Server:' + (new Buffer(getWebCertHash(obj.domain), 'binary').toString('hex').substring(0, 10)) + ' or ' + (new Buffer(getWebCertFullHash(obj.domain), 'binary').toString('hex').substring(0, 10)) + '), holding connection (' + obj.remoteaddrport + ').'); return; }
}
// Use our server private key to sign the ServerHash + AgentNonce + ServerNonce
obj.agentnonce = msg.substring(50, 98);
@ -285,7 +290,9 @@ module.exports.CreateMeshAgent = function (parent, db, ws, req, args, domain) {
// Start authenticate the mesh agent by sending a auth nonce & server TLS cert hash.
// Send 384 bits SHA384 hash of TLS cert public key + 384 bits nonce
obj.nonce = obj.parent.crypto.randomBytes(48).toString('binary');
obj.send(obj.common.ShortToStr(1) + getWebCertHash(obj.domain) + obj.nonce); // Command 1, hash + nonce
if (obj.args.ignoreagenthashcheck !== true) {
obj.send(obj.common.ShortToStr(1) + getWebCertHash(obj.domain) + obj.nonce); // Command 1, hash + nonce
}
// Once we get all the information about an agent, run this to hook everything up to the server
function completeAgentConnection() {
@ -427,13 +434,15 @@ module.exports.CreateMeshAgent = function (parent, db, ws, req, args, domain) {
// Verify the agent signature
function processAgentSignature(msg) {
// Verify the signature. This is the fast way, without using forge.
const verify = obj.parent.crypto.createVerify('SHA384');
verify.end(new Buffer(getWebCertHash(obj.domain) + obj.nonce + obj.agentnonce, 'binary')); // Test using the private key hash
if (verify.verify(obj.unauth.nodeCertPem, new Buffer(msg, 'binary')) !== true) {
const verify2 = obj.parent.crypto.createVerify('SHA384');
verify2.end(new Buffer(getWebCertFullHash(obj.domain) + obj.nonce + obj.agentnonce, 'binary')); // Test using the full cert hash
if (verify2.verify(obj.unauth.nodeCertPem, new Buffer(msg, 'binary')) !== true) { return false; }
if (obj.args.ignoreagenthashcheck !== true) {
// Verify the signature. This is the fast way, without using forge.
const verify = obj.parent.crypto.createVerify('SHA384');
verify.end(new Buffer(getWebCertHash(obj.domain) + obj.nonce + obj.agentnonce, 'binary')); // Test using the private key hash
if (verify.verify(obj.unauth.nodeCertPem, new Buffer(msg, 'binary')) !== true) {
const verify2 = obj.parent.crypto.createVerify('SHA384');
verify2.end(new Buffer(getWebCertFullHash(obj.domain) + obj.nonce + obj.agentnonce, 'binary')); // Test using the full cert hash
if (verify2.verify(obj.unauth.nodeCertPem, new Buffer(msg, 'binary')) !== true) { return false; }
}
}
// Connection is a success, clean up