Merge branch 'add-ra2ne-security-type' of https://github.com/pdlan/noVNC

2 files changed, 623 insertions, 0 deletions

diff --git a/core/ra2.js b/core/ra2.js
new file mode 100644
index 0000000..81a8a89
--- /dev/null
+++ b/core/ra2.js
@@ -0,0 +1,567 @@
+import Base64 from './base64.js';
+import { encodeUTF8 } from './util/strings.js';
+import EventTargetMixin from './util/eventtarget.js';
+
+export class AESEAXCipher {
+    constructor() {
+        this._rawKey = null;
+        this._ctrKey = null;
+        this._cbcKey = null;
+        this._zeroBlock = new Uint8Array(16);
+        this._prefixBlock0 = this._zeroBlock;
+        this._prefixBlock1 = new Uint8Array([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1]);
+        this._prefixBlock2 = new Uint8Array([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2]);
+    }
+
+    async _encryptBlock(block) {
+        const encrypted = await window.crypto.subtle.encrypt({
+            name: "AES-CBC",
+            iv: this._zeroBlock,
+        }, this._cbcKey, block);
+        return new Uint8Array(encrypted).slice(0, 16);
+    }
+
+    async _initCMAC() {
+        const k1 = await this._encryptBlock(this._zeroBlock);
+        const k2 = new Uint8Array(16);
+        const v = k1[0] >>> 6;
+        for (let i = 0; i < 15; i++) {
+            k2[i] = (k1[i + 1] >> 6) | (k1[i] << 2);
+            k1[i] = (k1[i + 1] >> 7) | (k1[i] << 1);
+        }
+        const lut = [0x0, 0x87, 0x0e, 0x89];
+        k2[14] ^= v >>> 1;
+        k2[15] = (k1[15] << 2) ^ lut[v];
+        k1[15] = (k1[15] << 1) ^ lut[v >> 1];
+        this._k1 = k1;
+        this._k2 = k2;
+    }
+
+    async _encryptCTR(data, counter) {
+        const encrypted = await window.crypto.subtle.encrypt({
+            "name": "AES-CTR",
+            counter: counter,
+            length: 128
+        }, this._ctrKey, data);
+        return new Uint8Array(encrypted);
+    }
+
+    async _decryptCTR(data, counter) {
+        const decrypted = await window.crypto.subtle.decrypt({
+            "name": "AES-CTR",
+            counter: counter,
+            length: 128
+        }, this._ctrKey, data);
+        return new Uint8Array(decrypted);
+    }
+
+    async _computeCMAC(data, prefixBlock) {
+        if (prefixBlock.length !== 16) {
+            return null;
+        }
+        const n = Math.floor(data.length / 16);
+        const m = Math.ceil(data.length / 16);
+        const r = data.length - n * 16;
+        const cbcData = new Uint8Array((m + 1) * 16);
+        cbcData.set(prefixBlock);
+        cbcData.set(data, 16);
+        if (r === 0) {
+            for (let i = 0; i < 16; i++) {
+                cbcData[n * 16 + i] ^= this._k1[i];
+            }
+        } else {
+            cbcData[(n + 1) * 16 + r] = 0x80;
+            for (let i = 0; i < 16; i++) {
+                cbcData[(n + 1) * 16 + i] ^= this._k2[i];
+            }
+        }
+        let cbcEncrypted = await window.crypto.subtle.encrypt({
+            name: "AES-CBC",
+            iv: this._zeroBlock,
+        }, this._cbcKey, cbcData);
+
+        cbcEncrypted = new Uint8Array(cbcEncrypted);
+        const mac = cbcEncrypted.slice(cbcEncrypted.length - 32, cbcEncrypted.length - 16);
+        return mac;
+    }
+
+    async setKey(key) {
+        this._rawKey = key;
+        this._ctrKey = await window.crypto.subtle.importKey(
+            "raw", key, {"name": "AES-CTR"}, false, ["encrypt", "decrypt"]);
+        this._cbcKey = await window.crypto.subtle.importKey(
+            "raw", key, {"name": "AES-CBC"}, false, ["encrypt", "decrypt"]);
+        await this._initCMAC();
+    }
+
+    async encrypt(message, associatedData, nonce) {
+        const nCMAC = await this._computeCMAC(nonce, this._prefixBlock0);
+        const encrypted = await this._encryptCTR(message, nCMAC);
+        const adCMAC = await this._computeCMAC(associatedData, this._prefixBlock1);
+        const mac = await this._computeCMAC(encrypted, this._prefixBlock2);
+        for (let i = 0; i < 16; i++) {
+            mac[i] ^= nCMAC[i] ^ adCMAC[i];
+        }
+        const res = new Uint8Array(16 + encrypted.length);
+        res.set(encrypted);
+        res.set(mac, encrypted.length);
+        return res;
+    }
+
+    async decrypt(encrypted, associatedData, nonce, mac) {
+        const nCMAC = await this._computeCMAC(nonce, this._prefixBlock0);
+        const adCMAC = await this._computeCMAC(associatedData, this._prefixBlock1);
+        const computedMac = await this._computeCMAC(encrypted, this._prefixBlock2);
+        for (let i = 0; i < 16; i++) {
+            computedMac[i] ^= nCMAC[i] ^ adCMAC[i];
+        }
+        if (computedMac.length !== mac.length) {
+            return null;
+        }
+        for (let i = 0; i < mac.length; i++) {
+            if (computedMac[i] !== mac[i]) {
+                return null;
+            }
+        }
+        const res = await this._decryptCTR(encrypted, nCMAC);
+        return res;
+    }
+}
+
+export class RA2Cipher {
+    constructor() {
+        this._cipher = new AESEAXCipher();
+        this._counter = new Uint8Array(16);
+    }
+
+    async setKey(key) {
+        await this._cipher.setKey(key);
+    }
+
+    async makeMessage(message) {
+        const ad = new Uint8Array([(message.length & 0xff00) >>> 8, message.length & 0xff]);
+        const encrypted = await this._cipher.encrypt(message, ad, this._counter);
+        for (let i = 0; i < 16 && this._counter[i]++ === 255; i++);
+        const res = new Uint8Array(message.length + 2 + 16);
+        res.set(ad);
+        res.set(encrypted, 2);
+        return res;
+    }
+
+    async receiveMessage(length, encrypted, mac) {
+        const ad = new Uint8Array([(length & 0xff00) >>> 8, length & 0xff]);
+        const res = await this._cipher.decrypt(encrypted, ad, this._counter, mac);
+        for (let i = 0; i < 16 && this._counter[i]++ === 255; i++);
+        return res;
+    }
+}
+
+export class RSACipher {
+    constructor(keyLength) {
+        this._key = null;
+        this._keyLength = keyLength;
+        this._keyBytes = Math.ceil(keyLength / 8);
+        this._n = null;
+        this._e = null;
+        this._d = null;
+        this._nBigInt = null;
+        this._eBigInt = null;
+        this._dBigInt = null;
+    }
+
+    _base64urlDecode(data) {
+        data = data.replace(/-/g, "+").replace(/_/g, "/");
+        data = data.padEnd(Math.ceil(data.length / 4) * 4, "=");
+        return Base64.decode(data);
+    }
+
+    _u8ArrayToBigInt(arr) {
+        let hex = '0x';
+        for (let i = 0; i < arr.length; i++) {
+            hex += arr[i].toString(16).padStart(2, '0');
+        }
+        return BigInt(hex);
+    }
+
+    _padArray(arr, length) {
+        const res = new Uint8Array(length);
+        res.set(arr, length - arr.length);
+        return res;
+    }
+
+    _bigIntToU8Array(bigint, padLength=0) {
+        let hex = bigint.toString(16);
+        if (padLength === 0) {
+            padLength = Math.ceil(hex.length / 2) * 2;
+        }
+        hex = hex.padStart(padLength * 2, '0');
+        const length = hex.length / 2;
+        const arr = new Uint8Array(length);
+        for (let i = 0; i < length; i++) {
+            arr[i] = parseInt(hex.slice(i * 2, i * 2 + 2), 16);
+        }
+        return arr;
+    }
+
+    _modPow(b, e, m) {
+        if (m === 1n) {
+            return 0;
+        }
+        let r = 1n;
+        b = b % m;
+        while (e > 0) {
+            if (e % 2n === 1n) {
+                r = (r * b) % m;
+            }
+            e = e / 2n;
+            b = (b * b) % m;
+        }
+        return r;
+    }
+
+    async generateKey() {
+        this._key = await window.crypto.subtle.generateKey(
+            {
+                name: "RSA-OAEP",
+                modulusLength: this._keyLength,
+                publicExponent: new Uint8Array([0x01, 0x00, 0x01]),
+                hash: {name: "SHA-256"},
+            },
+            true, ["encrypt", "decrypt"]);
+        const privateKey = await window.crypto.subtle.exportKey("jwk", this._key.privateKey);
+        this._n = this._padArray(this._base64urlDecode(privateKey.n), this._keyBytes);
+        this._nBigInt = this._u8ArrayToBigInt(this._n);
+        this._e = this._padArray(this._base64urlDecode(privateKey.e), this._keyBytes);
+        this._eBigInt = this._u8ArrayToBigInt(this._e);
+        this._d = this._padArray(this._base64urlDecode(privateKey.d), this._keyBytes);
+        this._dBigInt = this._u8ArrayToBigInt(this._d);
+    }
+
+    setPublicKey(n, e) {
+        if (n.length !== this._keyBytes || e.length !== this._keyBytes) {
+            return;
+        }
+        this._n = new Uint8Array(this._keyBytes);
+        this._e = new Uint8Array(this._keyBytes);
+        this._n.set(n);
+        this._e.set(e);
+        this._nBigInt = this._u8ArrayToBigInt(this._n);
+        this._eBigInt = this._u8ArrayToBigInt(this._e);
+    }
+
+    encrypt(message) {
+        if (message.length > this._keyBytes - 11) {
+            return null;
+        }
+        const ps = new Uint8Array(this._keyBytes - message.length - 3);
+        window.crypto.getRandomValues(ps);
+        for (let i = 0; i < ps.length; i++) {
+            ps[i] = Math.floor(ps[i] * 254 / 255 + 1);
+        }
+        const em = new Uint8Array(this._keyBytes);
+        em[1] = 0x02;
+        em.set(ps, 2);
+        em.set(message, ps.length + 3);
+        const emBigInt = this._u8ArrayToBigInt(em);
+        const c = this._modPow(emBigInt, this._eBigInt, this._nBigInt);
+        return this._bigIntToU8Array(c, this._keyBytes);
+    }
+
+    decrypt(message) {
+        if (message.length !== this._keyBytes) {
+            return null;
+        }
+        const msgBigInt = this._u8ArrayToBigInt(message);
+        const emBigInt = this._modPow(msgBigInt, this._dBigInt, this._nBigInt);
+        const em = this._bigIntToU8Array(emBigInt, this._keyBytes);
+        if (em[0] !== 0x00 || em[1] !== 0x02) {
+            return null;
+        }
+        let i = 2;
+        for (; i < em.length; i++) {
+            if (em[i] === 0x00) {
+                break;
+            }
+        }
+        if (i === em.length) {
+            return null;
+        }
+        return em.slice(i + 1, em.length);
+    }
+
+    get keyLength() {
+        return this._keyLength;
+    }
+
+    get n() {
+        return this._n;
+    }
+
+    get e() {
+        return this._e;
+    }
+
+    get d() {
+        return this._d;
+    }
+}
+
+export default class RSAAESAuthenticationState extends EventTargetMixin {
+    constructor(sock, getCredentials) {
+        super();
+        this._hasStarted = false;
+        this._checkSock = null;
+        this._checkCredentials = null;
+        this._approveServerResolve = null;
+        this._sockReject = null;
+        this._credentialsReject = null;
+        this._approveServerReject = null;
+        this._sock = sock;
+        this._getCredentials = getCredentials;
+    }
+
+    _waitSockAsync(len) {
+        return new Promise((resolve, reject) => {
+            const hasData = () => !this._sock.rQwait('RA2', len);
+            if (hasData()) {
+                resolve();
+            } else {
+                this._checkSock = () => {
+                    if (hasData()) {
+                        resolve();
+                        this._checkSock = null;
+                        this._sockReject = null;
+                    }
+                };
+                this._sockReject = reject;
+            }
+        });
+    }
+
+    _waitApproveKeyAsync() {
+        return new Promise((resolve, reject) => {
+            this._approveServerResolve = resolve;
+            this._approveServerReject = reject;
+        });
+    }
+
+    _waitCredentialsAsync(subtype) {
+        const hasCredentials = () => {
+            if (subtype === 1 && this._getCredentials().username !== undefined &&
+                this._getCredentials().password !== undefined) {
+                return true;
+            } else if (subtype === 2 && this._getCredentials().password !== undefined) {
+                return true;
+            }
+            return false;
+        };
+        return new Promise((resolve, reject) => {
+            if (hasCredentials()) {
+                resolve();
+            } else {
+                this._checkCredentials = () => {
+                    if (hasCredentials()) {
+                        resolve();
+                        this._checkCredentials = null;
+                        this._credentialsReject = null;
+                    }
+                };
+                this._credentialsReject = reject;
+            }
+        });
+    }
+
+    checkInternalEvents() {
+        if (this._checkSock !== null) {
+            this._checkSock();
+        }
+        if (this._checkCredentials !== null) {
+            this._checkCredentials();
+        }
+    }
+
+    approveServer() {
+        if (this._approveServerResolve !== null) {
+            this._approveServerResolve();
+            this._approveServerResolve = null;
+        }
+    }
+
+    disconnect() {
+        if (this._sockReject !== null) {
+            this._sockReject(new Error("disconnect normally"));
+            this._sockReject = null;
+        }
+        if (this._credentialsReject !== null) {
+            this._credentialsReject(new Error("disconnect normally"));
+            this._credentialsReject = null;
+        }
+        if (this._approveServerReject !== null) {
+            this._approveServerReject(new Error("disconnect normally"));
+            this._approveServerReject = null;
+        }
+    }
+
+    async negotiateRA2neAuthAsync() {
+        this._hasStarted = true;
+        // 1: Receive server public key
+        await this._waitSockAsync(4);
+        const serverKeyLengthBuffer = this._sock.rQslice(0, 4);
+        const serverKeyLength = this._sock.rQshift32();
+        if (serverKeyLength < 1024) {
+            throw new Error("RA2: server public key is too short: " + serverKeyLength);
+        } else if (serverKeyLength > 8192) {
+            throw new Error("RA2: server public key is too long: " + serverKeyLength);
+        }
+        const serverKeyBytes = Math.ceil(serverKeyLength / 8);
+        await this._waitSockAsync(serverKeyBytes * 2);
+        const serverN = this._sock.rQshiftBytes(serverKeyBytes);
+        const serverE = this._sock.rQshiftBytes(serverKeyBytes);
+        const serverRSACipher = new RSACipher(serverKeyLength);
+        serverRSACipher.setPublicKey(serverN, serverE);
+        const serverPublickey = new Uint8Array(4 + serverKeyBytes * 2);
+        serverPublickey.set(serverKeyLengthBuffer);
+        serverPublickey.set(serverN, 4);
+        serverPublickey.set(serverE, 4 + serverKeyBytes);
+
+        // verify server public key
+        this.dispatchEvent(new CustomEvent("serververification", {
+            detail: { type: "RSA", publickey: serverPublickey }
+        }));
+        await this._waitApproveKeyAsync();
+
+        // 2: Send client public key
+        const clientKeyLength = 2048;
+        const clientKeyBytes = Math.ceil(clientKeyLength / 8);
+        const clientRSACipher = new RSACipher(clientKeyLength);
+        await clientRSACipher.generateKey();
+        const clientN = clientRSACipher.n;
+        const clientE = clientRSACipher.e;
+        const clientPublicKey = new Uint8Array(4 + clientKeyBytes * 2);
+        clientPublicKey[0] = (clientKeyLength & 0xff000000) >>> 24;
+        clientPublicKey[1] = (clientKeyLength & 0xff0000) >>> 16;
+        clientPublicKey[2] = (clientKeyLength & 0xff00) >>> 8;
+        clientPublicKey[3] = clientKeyLength & 0xff;
+        clientPublicKey.set(clientN, 4);
+        clientPublicKey.set(clientE, 4 + clientKeyBytes);
+        this._sock.send(clientPublicKey);
+
+        // 3: Send client random
+        const clientRandom = new Uint8Array(16);
+        window.crypto.getRandomValues(clientRandom);
+        const clientEncryptedRandom = serverRSACipher.encrypt(clientRandom);
+        const clientRandomMessage = new Uint8Array(2 + serverKeyBytes);
+        clientRandomMessage[0] = (serverKeyBytes & 0xff00) >>> 8;
+        clientRandomMessage[1] = serverKeyBytes & 0xff;
+        clientRandomMessage.set(clientEncryptedRandom, 2);
+        this._sock.send(clientRandomMessage);
+
+        // 4: Receive server random
+        await this._waitSockAsync(2);
+        if (this._sock.rQshift16() !== clientKeyBytes) {
+            throw new Error("RA2: wrong encrypted message length");
+        }
+        const serverEncryptedRandom = this._sock.rQshiftBytes(clientKeyBytes);
+        const serverRandom = clientRSACipher.decrypt(serverEncryptedRandom);
+        if (serverRandom === null || serverRandom.length !== 16) {
+            throw new Error("RA2: corrupted server encrypted random");
+        }
+
+        // 5: Compute session keys and set ciphers
+        let clientSessionKey = new Uint8Array(32);
+        let serverSessionKey = new Uint8Array(32);
+        clientSessionKey.set(serverRandom);
+        clientSessionKey.set(clientRandom, 16);
+        serverSessionKey.set(clientRandom);
+        serverSessionKey.set(serverRandom, 16);
+        clientSessionKey = await window.crypto.subtle.digest("SHA-1", clientSessionKey);
+        clientSessionKey = new Uint8Array(clientSessionKey).slice(0, 16);
+        serverSessionKey = await window.crypto.subtle.digest("SHA-1", serverSessionKey);
+        serverSessionKey = new Uint8Array(serverSessionKey).slice(0, 16);
+        const clientCipher = new RA2Cipher();
+        await clientCipher.setKey(clientSessionKey);
+        const serverCipher = new RA2Cipher();
+        await serverCipher.setKey(serverSessionKey);
+
+        // 6: Compute and exchange hashes
+        let serverHash = new Uint8Array(8 + serverKeyBytes * 2 + clientKeyBytes * 2);
+        let clientHash = new Uint8Array(8 + serverKeyBytes * 2 + clientKeyBytes * 2);
+        serverHash.set(serverPublickey);
+        serverHash.set(clientPublicKey, 4 + serverKeyBytes * 2);
+        clientHash.set(clientPublicKey);
+        clientHash.set(serverPublickey, 4 + clientKeyBytes * 2);
+        serverHash = await window.crypto.subtle.digest("SHA-1", serverHash);
+        clientHash = await window.crypto.subtle.digest("SHA-1", clientHash);
+        serverHash = new Uint8Array(serverHash);
+        clientHash = new Uint8Array(clientHash);
+        this._sock.send(await clientCipher.makeMessage(clientHash));
+        await this._waitSockAsync(2 + 20 + 16);
+        if (this._sock.rQshift16() !== 20) {
+            throw new Error("RA2: wrong server hash");
+        }
+        const serverHashReceived = await serverCipher.receiveMessage(
+            20, this._sock.rQshiftBytes(20), this._sock.rQshiftBytes(16));
+        if (serverHashReceived === null) {
+            throw new Error("RA2: failed to authenticate the message");
+        }
+        for (let i = 0; i < 20; i++) {
+            if (serverHashReceived[i] !== serverHash[i]) {
+                throw new Error("RA2: wrong server hash");
+            }
+        }
+
+        // 7: Receive subtype
+        await this._waitSockAsync(2 + 1 + 16);
+        if (this._sock.rQshift16() !== 1) {
+            throw new Error("RA2: wrong subtype");
+        }
+        let subtype = (await serverCipher.receiveMessage(
+            1, this._sock.rQshiftBytes(1), this._sock.rQshiftBytes(16)));
+        if (subtype === null) {
+            throw new Error("RA2: failed to authenticate the message");
+        }
+        subtype = subtype[0];
+        if (subtype === 1) {
+            if (this._getCredentials().username === undefined ||
+                this._getCredentials().password === undefined) {
+                this.dispatchEvent(new CustomEvent(
+                    "credentialsrequired",
+                    { detail: { types: ["username", "password"] } }));
+            }
+        } else if (subtype === 2) {
+            if (this._getCredentials().password === undefined) {
+                this.dispatchEvent(new CustomEvent(
+                    "credentialsrequired",
+                    { detail: { types: ["password"] } }));
+            }
+        } else {
+            throw new Error("RA2: wrong subtype");
+        }
+        await this._waitCredentialsAsync(subtype);
+        let username;
+        if (subtype === 1) {
+            username = encodeUTF8(this._getCredentials().username).slice(0, 255);
+        } else {
+            username = "";
+        }
+        const password = encodeUTF8(this._getCredentials().password).slice(0, 255);
+        const credentials = new Uint8Array(username.length + password.length + 2);
+        credentials[0] = username.length;
+        credentials[username.length + 1] = password.length;
+        for (let i = 0; i < username.length; i++) {
+            credentials[i + 1] = username.charCodeAt(i);
+        }
+        for (let i = 0; i < password.length; i++) {
+            credentials[username.length + 2 + i] = password.charCodeAt(i);
+        }
+        this._sock.send(await clientCipher.makeMessage(credentials));
+    }
+
+    get hasStarted() {
+        return this._hasStarted;
+    }
+
+    set hasStarted(s) {
+        this._hasStarted = s;
+    }
+}
\ No newline at end of file
diff --git a/core/rfb.js b/core/rfb.js
index 970e03f..860a85b 100644
--- a/core/rfb.js
+++ b/core/rfb.js
@@ -25,6 +25,7 @@ import DES from "./des.js";
 import KeyTable from "./input/keysym.js";
 import XtScancode from "./input/xtscancodes.js";
 import { encodings } from "./encodings.js";
+import RSAAESAuthenticationState from "./ra2.js";
 
 import RawDecoder from "./decoders/raw.js";
 import CopyRectDecoder from "./decoders/copyrect.js";
@@ -100,6 +101,7 @@ export default class RFB extends EventTargetMixin {
         this._rfbInitState = '';
         this._rfbAuthScheme = -1;
         this._rfbCleanDisconnect = true;
+        this._rfbRSAAESAuthenticationState = null;
 
         // Server capabilities
         this._rfbVersion = 0;
@@ -178,6 +180,8 @@ export default class RFB extends EventTargetMixin {
             handleMouse: this._handleMouse.bind(this),
             handleWheel: this._handleWheel.bind(this),
             handleGesture: this._handleGesture.bind(this),
+            handleRSAAESCredentialsRequired: this._handleRSAAESCredentialsRequired.bind(this),
+            handleRSAAESServerVerification: this._handleRSAAESServerVerification.bind(this),
         };
 
         // main setup
@@ -378,6 +382,15 @@ export default class RFB extends EventTargetMixin {
         this._sock.off('error');
         this._sock.off('message');
         this._sock.off('open');
+        if (this._rfbRSAAESAuthenticationState !== null) {
+            this._rfbRSAAESAuthenticationState.disconnect();
+        }
+    }
+
+    approveServer() {
+        if (this._rfbRSAAESAuthenticationState !== null) {
+            this._rfbRSAAESAuthenticationState.approveServer();
+        }
     }
 
     sendCredentials(creds) {
@@ -1335,6 +1348,8 @@ export default class RFB extends EventTargetMixin {
                 this._rfbAuthScheme = 22; // XVP
             } else if (types.includes(16)) {
                 this._rfbAuthScheme = 16; // Tight
+            } else if (types.includes(6)) {
+                this._rfbAuthScheme = 6; // RA2ne Auth
             } else if (types.includes(2)) {
                 this._rfbAuthScheme = 2; // VNC Auth
             } else if (types.includes(19)) {
@@ -1652,6 +1667,44 @@ export default class RFB extends EventTargetMixin {
         return this._fail("No supported sub-auth types!");
     }
 
+    _handleRSAAESCredentialsRequired(event) {
+        this.dispatchEvent(event);
+    }
+
+    _handleRSAAESServerVerification(event) {
+        this.dispatchEvent(event);
+    }
+
+    _negotiateRA2neAuth() {
+        if (this._rfbRSAAESAuthenticationState === null) {
+            this._rfbRSAAESAuthenticationState = new RSAAESAuthenticationState(this._sock, () => this._rfbCredentials);
+            this._rfbRSAAESAuthenticationState.addEventListener(
+                "serververification", this._eventHandlers.handleRSAAESServerVerification);
+            this._rfbRSAAESAuthenticationState.addEventListener(
+                "credentialsrequired", this._eventHandlers.handleRSAAESCredentialsRequired);
+        }
+        this._rfbRSAAESAuthenticationState.checkInternalEvents();
+        if (!this._rfbRSAAESAuthenticationState.hasStarted) {
+            this._rfbRSAAESAuthenticationState.negotiateRA2neAuthAsync()
+                .catch((e) => {
+                    if (e.message !== "disconnect normally") {
+                        this._fail(e.message);
+                    }
+                }).then(() => {
+                    this.dispatchEvent(new CustomEvent('securityresult'));
+                    this._rfbInitState = "SecurityResult";
+                    this._initMsg();
+                }).finally(() => {
+                    this._rfbRSAAESAuthenticationState.removeEventListener(
+                        "serververification", this._eventHandlers.handleRSAAESServerVerification);
+                    this._rfbRSAAESAuthenticationState.removeEventListener(
+                        "credentialsrequired", this._eventHandlers.handleRSAAESCredentialsRequired);
+                    this._rfbRSAAESAuthenticationState = null;
+                });
+        }
+        return false;
+    }
+
     _negotiateAuthentication() {
         switch (this._rfbAuthScheme) {
             case 1:  // no auth
@@ -1677,6 +1730,9 @@ export default class RFB extends EventTargetMixin {
             case 129:  // TightVNC UNIX Security Type
                 return this._negotiateTightUnixAuth();
 
+            case 6:  // RA2ne Security Type
+                return this._negotiateRA2neAuth();
+
             default:
                 return this._fail("Unsupported auth scheme (scheme: " +
                                   this._rfbAuthScheme + ")");