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Add support for handshake and KMS challenge #14

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70 changes: 66 additions & 4 deletions src/ssm.js
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Original file line number Diff line number Diff line change
@@ -1,5 +1,7 @@
import sha256 from "./sha256.js";

const HANDSHAKE_RESPONSE = 6;
const CHALLENGE_RESPONSE = 9;
const ACK_TYPE = 3;
const INPUT_TYPE = 1;
//const OUTPUT_TYPE = 0;
Expand Down Expand Up @@ -224,10 +226,10 @@ function uuidv4() {
var ssm = {
decode: function (buffer) {
/*
var buf = new Uint8Array([
0x00,0x00,0x00,0x74,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x69,0x6e,0x70,0x75,0x74,0x5f,0x73,0x74,0x72,0x65,0x61,0x6d,0x5f,0x64,0x61,0x74,0x61,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x00,0x1e,0x5b,0x37,0xe2,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x73,0x0f,0x66,0x49,0x14,0x53,0x4e,0x2a,0x9f,0x01,0xa3,0x7d,0xbf,0xfe,0xfc,0xe1,0x65,0x34,0x34,0x33,0x36,0x35,0x62,0x39,0x35,0x31,0x31,0x36,0x32,0x65,0x64,0x61,0x36,0x34,0x61,0x63,0x65,0x66,0x64,0x32,0x37,0x35,0x37,0x32,0x32,0x30,0x39,0x65,0x00,0x00,0x00,0x03,0x00,0x00,0x00,0x16,0x7b,0x22,0x63,0x6f,0x6c,0x73,0x22,0x3a,0x32,0x30,0x32,0x2c,0x22,0x72,0x6f,0x77,0x73,0x22,0x3a,0x31,0x38,0x7d]);
console.log(buf);
*/
var buf = new Uint8Array([
0x00,0x00,0x00,0x74,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x69,0x6e,0x70,0x75,0x74,0x5f,0x73,0x74,0x72,0x65,0x61,0x6d,0x5f,0x64,0x61,0x74,0x61,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x00,0x1e,0x5b,0x37,0xe2,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x73,0x0f,0x66,0x49,0x14,0x53,0x4e,0x2a,0x9f,0x01,0xa3,0x7d,0xbf,0xfe,0xfc,0xe1,0x65,0x34,0x34,0x33,0x36,0x35,0x62,0x39,0x35,0x31,0x31,0x36,0x32,0x65,0x64,0x61,0x36,0x34,0x61,0x63,0x65,0x66,0x64,0x32,0x37,0x35,0x37,0x32,0x32,0x30,0x39,0x65,0x00,0x00,0x00,0x03,0x00,0x00,0x00,0x16,0x7b,0x22,0x63,0x6f,0x6c,0x73,0x22,0x3a,0x32,0x30,0x32,0x2c,0x22,0x72,0x6f,0x77,0x73,0x22,0x3a,0x31,0x38,0x7d]);
console.log(buf);
*/
var buf = new Uint8Array(buffer);
var agentMessage = {
headerLength: getInt(buf.slice(0, 4)), //4
Expand Down Expand Up @@ -259,6 +261,18 @@ var ssm = {
sendInitMessage: function (connection, termOptions) {
connection.send(ssm.buildInitMessage(termOptions));
},

sendHandshakeResponse: function (connection, reqClientActions, kmsCipherText) {
const handshakeResp = ssm.buildHandshakeResponse(reqClientActions, kmsCipherText)
connection.send(handshakeResp);
},

sendChallengeResponse: function (connection, challengePayload) {
console.log(challengePayload)
const challengeResponse = ssm.buildChallengeResponse(challengePayload)
connection.send(challengeResponse);
},

buildTokenMessage: function (token) {
return JSON.stringify({
MessageSchemaVersion: "1.0",
Expand All @@ -267,6 +281,54 @@ var ssm = {
});
},

buildHandshakeResponse: function (reqClientActions, kmsCipherText) {
let handshakePayload = {
ClientVersion: "1.2.312.0", // latest when this was written
ProcessedClientActions: [],
Errors: [],
}
for (let action of reqClientActions) {
let processedAction = {
ActionType: action.ActionType,
}
if (action.ActionType == "KMSEncryption") {
if (kmsCipherText) {
processedAction.ActionStatus = 1
processedAction.ActionResult = {
KMSCipherTextKey: Array.from(kmsCipherText),
}
}
else processedAction.ActionStatus = 2
}
else if (action.ActionType == "SessionType") {
processedAction.ActionStatus = 1
}
else processedAction.ActionStatus = 3
handshakePayload.ProcessedClientActions.push(processedAction)
}
messageSequenceNumber++;
var handshakeResp = buildAgentMessage(
JSON.stringify(handshakePayload),
"input_stream_data",
messageSequenceNumber,
HANDSHAKE_RESPONSE,
1
);
return agentMessageToBuffer(handshakeResp);
},

buildChallengeResponse: function (challengePayload) {
messageSequenceNumber++;
var challengeResp = buildAgentMessage(
challengePayload,
"input_stream_data",
messageSequenceNumber,
CHALLENGE_RESPONSE,
1
);
return agentMessageToBuffer(challengeResp);
},

buildInitMessage: function (options) {
var payload = {
cols: options.cols,
Expand Down