| 1 | import { encodeUTF8 } from './util/strings.js'; |
| 2 | import EventTargetMixin from './util/eventtarget.js'; |
| 3 | import legacyCrypto from './crypto/crypto.js'; |
| 4 | |
| 5 | class RA2Cipher { |
| 6 | constructor() { |
| 7 | this._cipher = null; |
| 8 | this._counter = new Uint8Array(16); |
| 9 | } |
| 10 | |
| 11 | async setKey(key) { |
| 12 | this._cipher = await legacyCrypto.importKey( |
| 13 | "raw", key, { name: "AES-EAX" }, false, ["encrypt, decrypt"]); |
| 14 | } |
| 15 | |
| 16 | async makeMessage(message) { |
| 17 | const ad = new Uint8Array([(message.length & 0xff00) >>> 8, message.length & 0xff]); |
| 18 | const encrypted = await legacyCrypto.encrypt({ |
| 19 | name: "AES-EAX", |
| 20 | iv: this._counter, |
| 21 | additionalData: ad, |
| 22 | }, this._cipher, message); |
| 23 | for (let i = 0; i < 16 && this._counter[i]++ === 255; i++); |
| 24 | const res = new Uint8Array(message.length + 2 + 16); |
| 25 | res.set(ad); |
| 26 | res.set(encrypted, 2); |
| 27 | return res; |
| 28 | } |
| 29 | |
| 30 | async receiveMessage(length, encrypted) { |
| 31 | const ad = new Uint8Array([(length & 0xff00) >>> 8, length & 0xff]); |
| 32 | const res = await legacyCrypto.decrypt({ |
| 33 | name: "AES-EAX", |
| 34 | iv: this._counter, |
| 35 | additionalData: ad, |
| 36 | }, this._cipher, encrypted); |
| 37 | for (let i = 0; i < 16 && this._counter[i]++ === 255; i++); |
| 38 | return res; |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | export default class RSAAESAuthenticationState extends EventTargetMixin { |
| 43 | constructor(sock, getCredentials) { |
| 44 | super(); |
| 45 | this._hasStarted = false; |
| 46 | this._checkSock = null; |
| 47 | this._checkCredentials = null; |
| 48 | this._approveServerResolve = null; |
| 49 | this._sockReject = null; |
| 50 | this._credentialsReject = null; |
| 51 | this._approveServerReject = null; |
| 52 | this._sock = sock; |
| 53 | this._getCredentials = getCredentials; |
| 54 | } |
| 55 | |
| 56 | _waitSockAsync(len) { |
| 57 | return new Promise((resolve, reject) => { |
| 58 | const hasData = () => !this._sock.rQwait('RA2', len); |
| 59 | if (hasData()) { |
| 60 | resolve(); |
| 61 | } else { |
| 62 | this._checkSock = () => { |
| 63 | if (hasData()) { |
| 64 | resolve(); |
| 65 | this._checkSock = null; |
| 66 | this._sockReject = null; |
| 67 | } |
| 68 | }; |
| 69 | this._sockReject = reject; |
| 70 | } |
| 71 | }); |
| 72 | } |
| 73 | |
| 74 | _waitApproveKeyAsync() { |
| 75 | return new Promise((resolve, reject) => { |
| 76 | this._approveServerResolve = resolve; |
| 77 | this._approveServerReject = reject; |
| 78 | }); |
| 79 | } |
| 80 | |
| 81 | _waitCredentialsAsync(subtype) { |
| 82 | const hasCredentials = () => { |
| 83 | if (subtype === 1 && this._getCredentials().username !== undefined && |
| 84 | this._getCredentials().password !== undefined) { |
| 85 | return true; |
| 86 | } else if (subtype === 2 && this._getCredentials().password !== undefined) { |
| 87 | return true; |
| 88 | } |
| 89 | return false; |
| 90 | }; |
| 91 | return new Promise((resolve, reject) => { |
| 92 | if (hasCredentials()) { |
| 93 | resolve(); |
| 94 | } else { |
| 95 | this._checkCredentials = () => { |
| 96 | if (hasCredentials()) { |
| 97 | resolve(); |
| 98 | this._checkCredentials = null; |
| 99 | this._credentialsReject = null; |
| 100 | } |
| 101 | }; |
| 102 | this._credentialsReject = reject; |
| 103 | } |
| 104 | }); |
| 105 | } |
| 106 | |
| 107 | checkInternalEvents() { |
| 108 | if (this._checkSock !== null) { |
| 109 | this._checkSock(); |
| 110 | } |
| 111 | if (this._checkCredentials !== null) { |
| 112 | this._checkCredentials(); |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | approveServer() { |
| 117 | if (this._approveServerResolve !== null) { |
| 118 | this._approveServerResolve(); |
| 119 | this._approveServerResolve = null; |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | disconnect() { |
| 124 | if (this._sockReject !== null) { |
| 125 | this._sockReject(new Error("disconnect normally")); |
| 126 | this._sockReject = null; |
| 127 | } |
| 128 | if (this._credentialsReject !== null) { |
| 129 | this._credentialsReject(new Error("disconnect normally")); |
| 130 | this._credentialsReject = null; |
| 131 | } |
| 132 | if (this._approveServerReject !== null) { |
| 133 | this._approveServerReject(new Error("disconnect normally")); |
| 134 | this._approveServerReject = null; |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | async negotiateRA2neAuthAsync() { |
| 139 | this._hasStarted = true; |
| 140 | // 1: Receive server public key |
| 141 | await this._waitSockAsync(4); |
| 142 | const serverKeyLengthBuffer = this._sock.rQpeekBytes(4); |
| 143 | const serverKeyLength = this._sock.rQshift32(); |
| 144 | if (serverKeyLength < 1024) { |
| 145 | throw new Error("RA2: server public key is too short: " + serverKeyLength); |
| 146 | } else if (serverKeyLength > 8192) { |
| 147 | throw new Error("RA2: server public key is too long: " + serverKeyLength); |
| 148 | } |
| 149 | const serverKeyBytes = Math.ceil(serverKeyLength / 8); |
| 150 | await this._waitSockAsync(serverKeyBytes * 2); |
| 151 | const serverN = this._sock.rQshiftBytes(serverKeyBytes); |
| 152 | const serverE = this._sock.rQshiftBytes(serverKeyBytes); |
| 153 | const serverRSACipher = await legacyCrypto.importKey( |
| 154 | "raw", { n: serverN, e: serverE }, { name: "RSA-PKCS1-v1_5" }, false, ["encrypt"]); |
| 155 | const serverPublickey = new Uint8Array(4 + serverKeyBytes * 2); |
| 156 | serverPublickey.set(serverKeyLengthBuffer); |
| 157 | serverPublickey.set(serverN, 4); |
| 158 | serverPublickey.set(serverE, 4 + serverKeyBytes); |
| 159 | |
| 160 | // verify server public key |
| 161 | let approveKey = this._waitApproveKeyAsync(); |
| 162 | this.dispatchEvent(new CustomEvent("serververification", { |
| 163 | detail: { type: "RSA", publickey: serverPublickey } |
| 164 | })); |
| 165 | await approveKey; |
| 166 | |
| 167 | // 2: Send client public key |
| 168 | const clientKeyLength = 2048; |
| 169 | const clientKeyBytes = Math.ceil(clientKeyLength / 8); |
| 170 | const clientRSACipher = (await legacyCrypto.generateKey({ |
| 171 | name: "RSA-PKCS1-v1_5", |
| 172 | modulusLength: clientKeyLength, |
| 173 | publicExponent: new Uint8Array([1, 0, 1]), |
| 174 | }, true, ["encrypt"])).privateKey; |
| 175 | const clientExportedRSAKey = await legacyCrypto.exportKey("raw", clientRSACipher); |
| 176 | const clientN = clientExportedRSAKey.n; |
| 177 | const clientE = clientExportedRSAKey.e; |
| 178 | const clientPublicKey = new Uint8Array(4 + clientKeyBytes * 2); |
| 179 | clientPublicKey[0] = (clientKeyLength & 0xff000000) >>> 24; |
| 180 | clientPublicKey[1] = (clientKeyLength & 0xff0000) >>> 16; |
| 181 | clientPublicKey[2] = (clientKeyLength & 0xff00) >>> 8; |
| 182 | clientPublicKey[3] = clientKeyLength & 0xff; |
| 183 | clientPublicKey.set(clientN, 4); |
| 184 | clientPublicKey.set(clientE, 4 + clientKeyBytes); |
| 185 | this._sock.sQpushBytes(clientPublicKey); |
| 186 | this._sock.flush(); |
| 187 | |
| 188 | // 3: Send client random |
| 189 | const clientRandom = new Uint8Array(16); |
| 190 | window.crypto.getRandomValues(clientRandom); |
| 191 | const clientEncryptedRandom = await legacyCrypto.encrypt( |
| 192 | { name: "RSA-PKCS1-v1_5" }, serverRSACipher, clientRandom); |
| 193 | const clientRandomMessage = new Uint8Array(2 + serverKeyBytes); |
| 194 | clientRandomMessage[0] = (serverKeyBytes & 0xff00) >>> 8; |
| 195 | clientRandomMessage[1] = serverKeyBytes & 0xff; |
| 196 | clientRandomMessage.set(clientEncryptedRandom, 2); |
| 197 | this._sock.sQpushBytes(clientRandomMessage); |
| 198 | this._sock.flush(); |
| 199 | |
| 200 | // 4: Receive server random |
| 201 | await this._waitSockAsync(2); |
| 202 | if (this._sock.rQshift16() !== clientKeyBytes) { |
| 203 | throw new Error("RA2: wrong encrypted message length"); |
| 204 | } |
| 205 | const serverEncryptedRandom = this._sock.rQshiftBytes(clientKeyBytes); |
| 206 | const serverRandom = await legacyCrypto.decrypt( |
| 207 | { name: "RSA-PKCS1-v1_5" }, clientRSACipher, serverEncryptedRandom); |
| 208 | if (serverRandom === null || serverRandom.length !== 16) { |
| 209 | throw new Error("RA2: corrupted server encrypted random"); |
| 210 | } |
| 211 | |
| 212 | // 5: Compute session keys and set ciphers |
| 213 | let clientSessionKey = new Uint8Array(32); |
| 214 | let serverSessionKey = new Uint8Array(32); |
| 215 | clientSessionKey.set(serverRandom); |
| 216 | clientSessionKey.set(clientRandom, 16); |
| 217 | serverSessionKey.set(clientRandom); |
| 218 | serverSessionKey.set(serverRandom, 16); |
| 219 | clientSessionKey = await window.crypto.subtle.digest("SHA-1", clientSessionKey); |
| 220 | clientSessionKey = new Uint8Array(clientSessionKey).slice(0, 16); |
| 221 | serverSessionKey = await window.crypto.subtle.digest("SHA-1", serverSessionKey); |
| 222 | serverSessionKey = new Uint8Array(serverSessionKey).slice(0, 16); |
| 223 | const clientCipher = new RA2Cipher(); |
| 224 | await clientCipher.setKey(clientSessionKey); |
| 225 | const serverCipher = new RA2Cipher(); |
| 226 | await serverCipher.setKey(serverSessionKey); |
| 227 | |
| 228 | // 6: Compute and exchange hashes |
| 229 | let serverHash = new Uint8Array(8 + serverKeyBytes * 2 + clientKeyBytes * 2); |
| 230 | let clientHash = new Uint8Array(8 + serverKeyBytes * 2 + clientKeyBytes * 2); |
| 231 | serverHash.set(serverPublickey); |
| 232 | serverHash.set(clientPublicKey, 4 + serverKeyBytes * 2); |
| 233 | clientHash.set(clientPublicKey); |
| 234 | clientHash.set(serverPublickey, 4 + clientKeyBytes * 2); |
| 235 | serverHash = await window.crypto.subtle.digest("SHA-1", serverHash); |
| 236 | clientHash = await window.crypto.subtle.digest("SHA-1", clientHash); |
| 237 | serverHash = new Uint8Array(serverHash); |
| 238 | clientHash = new Uint8Array(clientHash); |
| 239 | this._sock.sQpushBytes(await clientCipher.makeMessage(clientHash)); |
| 240 | this._sock.flush(); |
| 241 | await this._waitSockAsync(2 + 20 + 16); |
| 242 | if (this._sock.rQshift16() !== 20) { |
| 243 | throw new Error("RA2: wrong server hash"); |
| 244 | } |
| 245 | const serverHashReceived = await serverCipher.receiveMessage( |
| 246 | 20, this._sock.rQshiftBytes(20 + 16)); |
| 247 | if (serverHashReceived === null) { |
| 248 | throw new Error("RA2: failed to authenticate the message"); |
| 249 | } |
| 250 | for (let i = 0; i < 20; i++) { |
| 251 | if (serverHashReceived[i] !== serverHash[i]) { |
| 252 | throw new Error("RA2: wrong server hash"); |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | // 7: Receive subtype |
| 257 | await this._waitSockAsync(2 + 1 + 16); |
| 258 | if (this._sock.rQshift16() !== 1) { |
| 259 | throw new Error("RA2: wrong subtype"); |
| 260 | } |
| 261 | let subtype = (await serverCipher.receiveMessage( |
| 262 | 1, this._sock.rQshiftBytes(1 + 16))); |
| 263 | if (subtype === null) { |
| 264 | throw new Error("RA2: failed to authenticate the message"); |
| 265 | } |
| 266 | subtype = subtype[0]; |
| 267 | let waitCredentials = this._waitCredentialsAsync(subtype); |
| 268 | if (subtype === 1) { |
| 269 | if (this._getCredentials().username === undefined || |
| 270 | this._getCredentials().password === undefined) { |
| 271 | this.dispatchEvent(new CustomEvent( |
| 272 | "credentialsrequired", |
| 273 | { detail: { types: ["username", "password"] } })); |
| 274 | } |
| 275 | } else if (subtype === 2) { |
| 276 | if (this._getCredentials().password === undefined) { |
| 277 | this.dispatchEvent(new CustomEvent( |
| 278 | "credentialsrequired", |
| 279 | { detail: { types: ["password"] } })); |
| 280 | } |
| 281 | } else { |
| 282 | throw new Error("RA2: wrong subtype"); |
| 283 | } |
| 284 | await waitCredentials; |
| 285 | let username; |
| 286 | if (subtype === 1) { |
| 287 | username = encodeUTF8(this._getCredentials().username).slice(0, 255); |
| 288 | } else { |
| 289 | username = ""; |
| 290 | } |
| 291 | const password = encodeUTF8(this._getCredentials().password).slice(0, 255); |
| 292 | const credentials = new Uint8Array(username.length + password.length + 2); |
| 293 | credentials[0] = username.length; |
| 294 | credentials[username.length + 1] = password.length; |
| 295 | for (let i = 0; i < username.length; i++) { |
| 296 | credentials[i + 1] = username.charCodeAt(i); |
| 297 | } |
| 298 | for (let i = 0; i < password.length; i++) { |
| 299 | credentials[username.length + 2 + i] = password.charCodeAt(i); |
| 300 | } |
| 301 | this._sock.sQpushBytes(await clientCipher.makeMessage(credentials)); |
| 302 | this._sock.flush(); |
| 303 | } |
| 304 | |
| 305 | get hasStarted() { |
| 306 | return this._hasStarted; |
| 307 | } |
| 308 | |
| 309 | set hasStarted(s) { |
| 310 | this._hasStarted = s; |
| 311 | } |
| 312 | } |