Merge branch 'authprio' of https://github.com/CendioOssman/noVNC

core/rfb.js

@@ -54,6 +54,21 @@ const GESTURE_SCRLSENS = 50;
 const DOUBLE_TAP_TIMEOUT = 1000;
 const DOUBLE_TAP_THRESHOLD = 50;
 
+// Security types
+const securityTypeNone              = 1;
+const securityTypeVNCAuth           = 2;
+const securityTypeRA2ne             = 6;
+const securityTypeTight             = 16;
+const securityTypeVeNCrypt          = 19;
+const securityTypeXVP               = 22;
+const securityTypeARD               = 30;
+
+// Special Tight security types
+const securityTypeUnixLogon         = 129;
+
+// VeNCrypt security types
+const securityTypePlain             = 256;
+
 // Extended clipboard pseudo-encoding formats
 const extendedClipboardFormatText   = 1;
 /*eslint-disable no-unused-vars */
@@ -402,7 +417,7 @@ export default class RFB extends EventTargetMixin {
 
     sendCredentials(creds) {
         this._rfbCredentials = creds;
-        setTimeout(this._initMsg.bind(this), 0);
+        this._resumeAuthentication();
     }
 
     sendCtrlAltDel() {
@@ -922,8 +937,15 @@ export default class RFB extends EventTargetMixin {
                     }
                 }
                 break;
+            case 'connecting':
+                while (this._rfbConnectionState === 'connecting') {
+                    if (!this._initMsg()) {
+                        break;
+                    }
+                }
+                break;
             default:
-                this._initMsg();
+                Log.Error("Got data while in an invalid state");
                 break;
         }
     }
@@ -1332,6 +1354,21 @@ export default class RFB extends EventTargetMixin {
         this._rfbInitState = 'Security';
     }
 
+    _isSupportedSecurityType(type) {
+        const clientTypes = [
+            securityTypeNone,
+            securityTypeVNCAuth,
+            securityTypeRA2ne,
+            securityTypeTight,
+            securityTypeVeNCrypt,
+            securityTypeXVP,
+            securityTypeARD,
+            securityTypePlain,
+        ];
+
+        return clientTypes.includes(type);
+    }
+
     _negotiateSecurity() {
         if (this._rfbVersion >= 3.7) {
             // Server sends supported list, client decides
@@ -1342,28 +1379,23 @@ export default class RFB extends EventTargetMixin {
                 this._rfbInitState = "SecurityReason";
                 this._securityContext = "no security types";
                 this._securityStatus = 1;
-                return this._initMsg();
+                return true;
             }
 
             const types = this._sock.rQshiftBytes(numTypes);
             Log.Debug("Server security types: " + types);
 
-            // Look for each auth in preferred order
+            // Look for a matching security type in the order that the
-            if (types.includes(1)) {
+            // server prefers
-                this._rfbAuthScheme = 1; // None
+            this._rfbAuthScheme = -1;
-            } else if (types.includes(22)) {
+            for (let type of types) {
-                this._rfbAuthScheme = 22; // XVP
+                if (this._isSupportedSecurityType(type)) {
-            } else if (types.includes(16)) {
+                    this._rfbAuthScheme = type;
-                this._rfbAuthScheme = 16; // Tight
+                    break;
-            } else if (types.includes(6)) {
+                }
-                this._rfbAuthScheme = 6; // RA2ne Auth
+            }
-            } else if (types.includes(2)) {
+
-                this._rfbAuthScheme = 2; // VNC Auth
+            if (this._rfbAuthScheme === -1) {
-            } else if (types.includes(30)) {
-                this._rfbAuthScheme = 30; // ARD Auth
-            } else if (types.includes(19)) {
-                this._rfbAuthScheme = 19; // VeNCrypt Auth
-            } else {
                 return this._fail("Unsupported security types (types: " + types + ")");
             }
 
@@ -1377,14 +1409,14 @@ export default class RFB extends EventTargetMixin {
                 this._rfbInitState = "SecurityReason";
                 this._securityContext = "authentication scheme";
                 this._securityStatus = 1;
-                return this._initMsg();
+                return true;
             }
         }
 
         this._rfbInitState = 'Authentication';
         Log.Debug('Authenticating using scheme: ' + this._rfbAuthScheme);
 
-        return this._initMsg(); // jump to authentication
+        return true;
     }
 
     _handleSecurityReason() {
@@ -1434,7 +1466,7 @@ export default class RFB extends EventTargetMixin {
                            this._rfbCredentials.username +
                            this._rfbCredentials.target;
         this._sock.sendString(xvpAuthStr);
-        this._rfbAuthScheme = 2;
+        this._rfbAuthScheme = securityTypeVNCAuth;
         return this._negotiateAuthentication();
     }
 
@@ -1492,18 +1524,36 @@ export default class RFB extends EventTargetMixin {
                 subtypes.push(this._sock.rQshift32());
             }
 
-            // 256 = Plain subtype
+            // Look for a matching security type in the order that the
-            if (subtypes.indexOf(256) != -1) {
+            // server prefers
-                // 0x100 = 256
+            this._rfbAuthScheme = -1;
-                this._sock.send([0, 0, 1, 0]);
+            for (let type of subtypes) {
-                this._rfbVeNCryptState = 4;
+                // Avoid getting in to a loop
-            } else {
+                if (type === securityTypeVeNCrypt) {
-                return this._fail("VeNCrypt Plain subtype not offered by server");
+                    continue;
+                }
+
+                if (this._isSupportedSecurityType(type)) {
+                    this._rfbAuthScheme = type;
+                    break;
                 }
             }
 
-        // negotiated Plain subtype, server waits for password
+            if (this._rfbAuthScheme === -1) {
-        if (this._rfbVeNCryptState == 4) {
+                return this._fail("Unsupported security types (types: " + subtypes + ")");
+            }
+
+            this._sock.send([this._rfbAuthScheme >> 24,
+                             this._rfbAuthScheme >> 16,
+                             this._rfbAuthScheme >> 8,
+                             this._rfbAuthScheme]);
+
+            this._rfbVeNCryptState == 4;
+            return true;
+        }
+    }
+
+    _negotiatePlainAuth() {
         if (this._rfbCredentials.username === undefined ||
             this._rfbCredentials.password === undefined) {
             this.dispatchEvent(new CustomEvent(
@@ -1533,7 +1583,6 @@ export default class RFB extends EventTargetMixin {
         this._rfbInitState = "SecurityResult";
         return true;
     }
-    }
 
     _negotiateStdVNCAuth() {
         if (this._sock.rQwait("auth challenge", 16)) { return false; }
@@ -1661,7 +1710,7 @@ export default class RFB extends EventTargetMixin {
         this._rfbCredentials.ardCredentials = encrypted;
         this._rfbCredentials.ardPublicKey = clientPublicKey;
 
-        setTimeout(this._initMsg.bind(this), 0);
+        this._resumeAuthentication();
     }
 
     _negotiateTightUnixAuth() {
@@ -1771,12 +1820,12 @@ export default class RFB extends EventTargetMixin {
                     case 'STDVNOAUTH__':  // no auth
                         this._rfbInitState = 'SecurityResult';
                         return true;
-                    case 'STDVVNCAUTH_': // VNC auth
+                    case 'STDVVNCAUTH_':
-                        this._rfbAuthScheme = 2;
+                        this._rfbAuthScheme = securityTypeVNCAuth;
-                        return this._initMsg();
+                        return true;
-                    case 'TGHTULGNAUTH': // UNIX auth
+                    case 'TGHTULGNAUTH':
-                        this._rfbAuthScheme = 129;
+                        this._rfbAuthScheme = securityTypeUnixLogon;
-                        return this._initMsg();
+                        return true;
                     default:
                         return this._fail("Unsupported tiny auth scheme " +
                                           "(scheme: " + authType + ")");
@@ -1813,7 +1862,7 @@ export default class RFB extends EventTargetMixin {
                 }).then(() => {
                     this.dispatchEvent(new CustomEvent('securityresult'));
                     this._rfbInitState = "SecurityResult";
-                    this._initMsg();
+                    return true;
                 }).finally(() => {
                     this._rfbRSAAESAuthenticationState.removeEventListener(
                         "serververification", this._eventHandlers.handleRSAAESServerVerification);
@@ -1827,33 +1876,32 @@ export default class RFB extends EventTargetMixin {
 
     _negotiateAuthentication() {
         switch (this._rfbAuthScheme) {
-            case 1:  // no auth
+            case securityTypeNone:
-                if (this._rfbVersion >= 3.8) {
                 this._rfbInitState = 'SecurityResult';
                 return true;
-                }
-                this._rfbInitState = 'ClientInitialisation';
-                return this._initMsg();
 
-            case 22:  // XVP auth
+            case securityTypeXVP:
                 return this._negotiateXvpAuth();
 
-            case 30:  // ARD auth
+            case securityTypeARD:
                 return this._negotiateARDAuth();
 
-            case 2:  // VNC authentication
+            case securityTypeVNCAuth:
                 return this._negotiateStdVNCAuth();
 
-            case 16:  // TightVNC Security Type
+            case securityTypeTight:
                 return this._negotiateTightAuth();
 
-            case 19:  // VeNCrypt Security Type
+            case securityTypeVeNCrypt:
                 return this._negotiateVeNCryptAuth();
 
-            case 129:  // TightVNC UNIX Security Type
+            case securityTypePlain:
+                return this._negotiatePlainAuth();
+
+            case securityTypeUnixLogon:
                 return this._negotiateTightUnixAuth();
 
-            case 6:  // RA2ne Security Type
+            case securityTypeRA2ne:
                 return this._negotiateRA2neAuth();
 
             default:
@@ -1863,6 +1911,13 @@ export default class RFB extends EventTargetMixin {
     }
 
     _handleSecurityResult() {
+        // There is no security choice, and hence no security result
+        // until RFB 3.7
+        if (this._rfbVersion < 3.7) {
+            this._rfbInitState = 'ClientInitialisation';
+            return true;
+        }
+
         if (this._sock.rQwait('VNC auth response ', 4)) { return false; }
 
         const status = this._sock.rQshift32();
@@ -1870,13 +1925,13 @@ export default class RFB extends EventTargetMixin {
         if (status === 0) { // OK
             this._rfbInitState = 'ClientInitialisation';
             Log.Debug('Authentication OK');
-            return this._initMsg();
+            return true;
         } else {
             if (this._rfbVersion >= 3.8) {
                 this._rfbInitState = "SecurityReason";
                 this._securityContext = "security result";
                 this._securityStatus = status;
-                return this._initMsg();
+                return true;
             } else {
                 this.dispatchEvent(new CustomEvent(
                     "securityfailure",
@@ -2052,6 +2107,14 @@ export default class RFB extends EventTargetMixin {
         }
     }
 
+    // Resume authentication handshake after it was paused for some
+    // reason, e.g. waiting for a password from the user
+    _resumeAuthentication() {
+        // We use setTimeout() so it's run in its own context, just like
+        // it originally did via the WebSocket's event handler
+        setTimeout(this._initMsg.bind(this), 0);
+    }
+
     _handleSetColourMapMsg() {
         Log.Debug("SetColorMapEntries");
 

tests/test.rfb.js

@@ -1026,7 +1026,6 @@ describe('Remote Frame Buffer Protocol Client', function () {
             client._rfbConnectionState = 'connecting';
         });
 
-        describe('ProtocolVersion', function () {
         function sendVer(ver, client) {
             const arr = new Uint8Array(12);
             for (let i = 0; i < ver.length; i++) {
@@ -1037,6 +1036,11 @@ describe('Remote Frame Buffer Protocol Client', function () {
             client._sock._websocket._receiveData(arr);
         }
 
+        function sendSecurity(type, cl) {
+            cl._sock._websocket._receiveData(new Uint8Array([1, type]));
+        }
+
+        describe('ProtocolVersion', function () {
             describe('version parsing', function () {
                 it('should interpret version 003.003 as version 3.3', function () {
                     sendVer('003.003', client);
@@ -1127,44 +1131,24 @@ describe('Remote Frame Buffer Protocol Client', function () {
 
         describe('Security', function () {
             beforeEach(function () {
-                client._rfbInitState = 'Security';
+                sendVer('003.008\n', client);
+                client._sock._websocket._getSentData();
             });
 
-            it('should simply receive the auth scheme when for versions < 3.7', function () {
+            it('should respect server preference order', function () {
-                client._rfbVersion = 3.6;
+                const authSchemes = [ 6, 79, 30, 188, 16, 6, 1 ];
-                const authSchemeRaw = [1, 2, 3, 4];
-                const authScheme = (authSchemeRaw[0] << 24) + (authSchemeRaw[1] << 16) +
-                                  (authSchemeRaw[2] << 8) + authSchemeRaw[3];
-                client._sock._websocket._receiveData(new Uint8Array(authSchemeRaw));
-                expect(client._rfbAuthScheme).to.equal(authScheme);
-            });
-
-            it('should prefer no authentication is possible', function () {
-                client._rfbVersion = 3.7;
-                const authSchemes = [2, 1, 3];
                 client._sock._websocket._receiveData(new Uint8Array(authSchemes));
-                expect(client._rfbAuthScheme).to.equal(1);
+                expect(client._sock).to.have.sent(new Uint8Array([30]));
-                expect(client._sock).to.have.sent(new Uint8Array([1, 1]));
             });
 
-            it('should choose for the most prefered scheme possible for versions >= 3.7', function () {
+            it('should fail if there are no supported schemes', function () {
-                client._rfbVersion = 3.7;
-                const authSchemes = [2, 22, 16];
-                client._sock._websocket._receiveData(new Uint8Array(authSchemes));
-                expect(client._rfbAuthScheme).to.equal(22);
-                expect(client._sock).to.have.sent(new Uint8Array([22]));
-            });
-
-            it('should fail if there are no supported schemes for versions >= 3.7', function () {
                 sinon.spy(client, "_fail");
-                client._rfbVersion = 3.7;
                 const authSchemes = [1, 32];
                 client._sock._websocket._receiveData(new Uint8Array(authSchemes));
                 expect(client._fail).to.have.been.calledOnce;
             });
 
-            it('should fail with the appropriate message if no types are sent for versions >= 3.7', function () {
+            it('should fail with the appropriate message if no types are sent', function () {
-                client._rfbVersion = 3.7;
                 const failureData = [0, 0, 0, 0, 6, 119, 104, 111, 111, 112, 115];
                 sinon.spy(client, '_fail');
                 client._sock._websocket._receiveData(new Uint8Array(failureData));
@@ -1175,7 +1159,6 @@ describe('Remote Frame Buffer Protocol Client', function () {
             });
 
             it('should transition to the Authentication state and continue on successful negotiation', function () {
-                client._rfbVersion = 3.7;
                 const authSchemes = [1, 1];
                 client._negotiateAuthentication = sinon.spy();
                 client._sock._websocket._receiveData(new Uint8Array(authSchemes));
@@ -1184,17 +1167,8 @@ describe('Remote Frame Buffer Protocol Client', function () {
             });
         });
 
-        describe('Authentication', function () {
+        describe('Legacy Authentication', function () {
-            beforeEach(function () {
-                client._rfbInitState = 'Security';
-            });
-
-            function sendSecurity(type, cl) {
-                cl._sock._websocket._receiveData(new Uint8Array([1, type]));
-            }
-
             it('should fail on auth scheme 0 (pre 3.7) with the given message', function () {
-                client._rfbVersion = 3.6;
                 const errMsg = "Whoopsies";
                 const data = [0, 0, 0, 0];
                 const errLen = errMsg.length;
@@ -1203,37 +1177,42 @@ describe('Remote Frame Buffer Protocol Client', function () {
                     data.push(errMsg.charCodeAt(i));
                 }
 
+                sendVer('003.006\n', client);
+                client._sock._websocket._getSentData();
+
                 sinon.spy(client, '_fail');
                 client._sock._websocket._receiveData(new Uint8Array(data));
                 expect(client._fail).to.have.been.calledWith(
                     'Security negotiation failed on authentication scheme (reason: Whoopsies)');
             });
 
-            it('should transition straight to SecurityResult on "no auth" (1) for versions >= 3.8', function () {
+            it('should transition straight to ServerInitialisation on "no auth" for versions < 3.7', function () {
-                client._rfbVersion = 3.8;
+                sendVer('003.006\n', client);
+                client._sock._websocket._getSentData();
+
+                client._sock._websocket._receiveData(new Uint8Array([0, 0, 0, 1]));
+                expect(client._rfbInitState).to.equal('ServerInitialisation');
+            });
+        });
+
+        describe('Authentication', function () {
+            beforeEach(function () {
+                sendVer('003.008\n', client);
+                client._sock._websocket._getSentData();
+            });
+
+            it('should transition straight to SecurityResult on "no auth" (1)', function () {
                 sendSecurity(1, client);
                 expect(client._rfbInitState).to.equal('SecurityResult');
             });
 
-            it('should transition straight to ServerInitialisation on "no auth" for versions < 3.8', function () {
-                client._rfbVersion = 3.7;
-                sendSecurity(1, client);
-                expect(client._rfbInitState).to.equal('ServerInitialisation');
-            });
-
             it('should fail on an unknown auth scheme', function () {
                 sinon.spy(client, "_fail");
-                client._rfbVersion = 3.8;
                 sendSecurity(57, client);
                 expect(client._fail).to.have.been.calledOnce;
             });
 
             describe('VNC Authentication (type 2) Handler', function () {
-                beforeEach(function () {
-                    client._rfbInitState = 'Security';
-                    client._rfbVersion = 3.8;
-                });
-
                 it('should fire the credentialsrequired event if missing a password', function () {
                     const spy = sinon.spy();
                     client.addEventListener("credentialsrequired", spy);
@@ -1274,12 +1253,6 @@ describe('Remote Frame Buffer Protocol Client', function () {
             });
 
             describe('ARD Authentication (type 30) Handler', function () {
-
-                beforeEach(function () {
-                    client._rfbInitState = 'Security';
-                    client._rfbVersion = 3.8;
-                });
-
                 it('should fire the credentialsrequired event if all credentials are missing', function () {
                     const spy = sinon.spy();
                     client.addEventListener("credentialsrequired", spy);
@@ -1347,11 +1320,6 @@ describe('Remote Frame Buffer Protocol Client', function () {
             });
 
             describe('XVP Authentication (type 22) Handler', function () {
-                beforeEach(function () {
-                    client._rfbInitState = 'Security';
-                    client._rfbVersion = 3.8;
-                });
-
                 it('should fall through to standard VNC authentication upon completion', function () {
                     client._rfbCredentials = { username: 'user',
                                                target: 'target',
@@ -1400,8 +1368,6 @@ describe('Remote Frame Buffer Protocol Client', function () {
 
             describe('TightVNC Authentication (type 16) Handler', function () {
                 beforeEach(function () {
-                    client._rfbInitState = 'Security';
-                    client._rfbVersion = 3.8;
                     sendSecurity(16, client);
                     client._sock._websocket._getSentData();  // skip the security reply
                 });
@@ -1487,8 +1453,6 @@ describe('Remote Frame Buffer Protocol Client', function () {
 
             describe('VeNCrypt Authentication (type 19) Handler', function () {
                 beforeEach(function () {
-                    client._rfbInitState = 'Security';
-                    client._rfbVersion = 3.8;
                     sendSecurity(19, client);
                     expect(client._sock).to.have.sent(new Uint8Array([19]));
                 });
@@ -1499,18 +1463,70 @@ describe('Remote Frame Buffer Protocol Client', function () {
                     expect(client._fail).to.have.been.calledOnce;
                 });
 
-                it('should fail if the Plain authentication is not present', function () {
+                it('should fail if there are no supported subtypes', function () {
                     // VeNCrypt version
                     client._sock._websocket._receiveData(new Uint8Array([0, 2]));
                     expect(client._sock).to.have.sent(new Uint8Array([0, 2]));
                     // Server ACK.
                     client._sock._websocket._receiveData(new Uint8Array([0]));
-                    // Subtype list, only list subtype 1.
+                    // Subtype list
                     sinon.spy(client, "_fail");
-                    client._sock._websocket._receiveData(new Uint8Array([1, 0, 0, 0, 1]));
+                    client._sock._websocket._receiveData(new Uint8Array([2, 0, 0, 0, 9, 0, 0, 1, 4]));
                     expect(client._fail).to.have.been.calledOnce;
                 });
 
+                it('should support standard types', function () {
+                    // VeNCrypt version
+                    client._sock._websocket._receiveData(new Uint8Array([0, 2]));
+                    expect(client._sock).to.have.sent(new Uint8Array([0, 2]));
+                    // Server ACK.
+                    client._sock._websocket._receiveData(new Uint8Array([0]));
+                    // Subtype list
+                    client._sock._websocket._receiveData(new Uint8Array([2, 0, 0, 0, 2, 0, 0, 1, 4]));
+
+                    let expectedResponse = [];
+                    push32(expectedResponse, 2); // Chosen subtype.
+
+                    expect(client._sock).to.have.sent(new Uint8Array(expectedResponse));
+                });
+
+                it('should respect server preference order', function () {
+                    // VeNCrypt version
+                    client._sock._websocket._receiveData(new Uint8Array([0, 2]));
+                    expect(client._sock).to.have.sent(new Uint8Array([0, 2]));
+                    // Server ACK.
+                    client._sock._websocket._receiveData(new Uint8Array([0]));
+                    // Subtype list
+                    let subtypes = [ 6 ];
+                    push32(subtypes, 79);
+                    push32(subtypes, 30);
+                    push32(subtypes, 188);
+                    push32(subtypes, 256);
+                    push32(subtypes, 6);
+                    push32(subtypes, 1);
+                    client._sock._websocket._receiveData(new Uint8Array(subtypes));
+
+                    let expectedResponse = [];
+                    push32(expectedResponse, 30); // Chosen subtype.
+
+                    expect(client._sock).to.have.sent(new Uint8Array(expectedResponse));
+                });
+
+                it('should ignore redundant VeNCrypt subtype', function () {
+                    // VeNCrypt version
+                    client._sock._websocket._receiveData(new Uint8Array([0, 2]));
+                    expect(client._sock).to.have.sent(new Uint8Array([0, 2]));
+                    // Server ACK.
+                    client._sock._websocket._receiveData(new Uint8Array([0]));
+                    // Subtype list
+                    client._sock._websocket._receiveData(new Uint8Array([2, 0, 0, 0, 19, 0, 0, 0, 2]));
+
+                    let expectedResponse = [];
+                    push32(expectedResponse, 2); // Chosen subtype.
+
+                    expect(client._sock).to.have.sent(new Uint8Array(expectedResponse));
+                });
+
                 it('should support Plain authentication', function () {
                     client._rfbCredentials = { username: 'username', password: 'password' };
                     // VeNCrypt version
@@ -1582,9 +1598,30 @@ describe('Remote Frame Buffer Protocol Client', function () {
             });
         });
 
+        describe('Legacy SecurityResult', function () {
+            beforeEach(function () {
+                sendVer('003.007\n', client);
+                client._sock._websocket._getSentData();
+                sendSecurity(1, client);
+                client._sock._websocket._getSentData();
+            });
+
+            it('should not include reason in securityfailure event', function () {
+                const spy = sinon.spy();
+                client.addEventListener("securityfailure", spy);
+                client._sock._websocket._receiveData(new Uint8Array([0, 0, 0, 2]));
+                expect(spy).to.have.been.calledOnce;
+                expect(spy.args[0][0].detail.status).to.equal(2);
+                expect('reason' in spy.args[0][0].detail).to.be.false;
+            });
+        });
+
         describe('SecurityResult', function () {
             beforeEach(function () {
-                client._rfbInitState = 'SecurityResult';
+                sendVer('003.008\n', client);
+                client._sock._websocket._getSentData();
+                sendSecurity(1, client);
+                client._sock._websocket._getSentData();
             });
 
             it('should fall through to ServerInitialisation on a response code of 0', function () {
@@ -1592,60 +1629,26 @@ describe('Remote Frame Buffer Protocol Client', function () {
                 expect(client._rfbInitState).to.equal('ServerInitialisation');
             });
 
-            it('should fail on an error code of 1 with the given message for versions >= 3.8', function () {
-                client._rfbVersion = 3.8;
-                sinon.spy(client, '_fail');
-                const failureData = [0, 0, 0, 1, 0, 0, 0, 6, 119, 104, 111, 111, 112, 115];
-                client._sock._websocket._receiveData(new Uint8Array(failureData));
-                expect(client._fail).to.have.been.calledWith(
-                    'Security negotiation failed on security result (reason: whoops)');
-            });
-
-            it('should fail on an error code of 1 with a standard message for version < 3.8', function () {
-                sinon.spy(client, '_fail');
-                client._rfbVersion = 3.7;
-                client._sock._websocket._receiveData(new Uint8Array([0, 0, 0, 1]));
-                expect(client._fail).to.have.been.calledWith(
-                    'Security handshake failed');
-            });
-
-            it('should result in securityfailure event when receiving a non zero status', function () {
-                const spy = sinon.spy();
-                client.addEventListener("securityfailure", spy);
-                client._sock._websocket._receiveData(new Uint8Array([0, 0, 0, 2]));
-                expect(spy).to.have.been.calledOnce;
-                expect(spy.args[0][0].detail.status).to.equal(2);
-            });
-
             it('should include reason when provided in securityfailure event', function () {
-                client._rfbVersion = 3.8;
                 const spy = sinon.spy();
                 client.addEventListener("securityfailure", spy);
                 const failureData = [0, 0, 0, 1, 0, 0, 0, 12, 115, 117, 99, 104,
                                      32, 102, 97, 105, 108, 117, 114, 101];
                 client._sock._websocket._receiveData(new Uint8Array(failureData));
+                expect(spy).to.have.been.calledOnce;
                 expect(spy.args[0][0].detail.status).to.equal(1);
                 expect(spy.args[0][0].detail.reason).to.equal('such failure');
             });
 
             it('should not include reason when length is zero in securityfailure event', function () {
-                client._rfbVersion = 3.9;
                 const spy = sinon.spy();
                 client.addEventListener("securityfailure", spy);
                 const failureData = [0, 0, 0, 1, 0, 0, 0, 0];
                 client._sock._websocket._receiveData(new Uint8Array(failureData));
+                expect(spy).to.have.been.calledOnce;
                 expect(spy.args[0][0].detail.status).to.equal(1);
                 expect('reason' in spy.args[0][0].detail).to.be.false;
             });
-
-            it('should not include reason in securityfailure event for version < 3.8', function () {
-                client._rfbVersion = 3.6;
-                const spy = sinon.spy();
-                client.addEventListener("securityfailure", spy);
-                client._sock._websocket._receiveData(new Uint8Array([0, 0, 0, 2]));
-                expect(spy.args[0][0].detail.status).to.equal(2);
-                expect('reason' in spy.args[0][0].detail).to.be.false;
-            });
         });
 
         describe('ClientInitialisation', function () {