| [6a3a178] | 1 | // Copyright 2015 Joyent, Inc.
|
|---|
| 2 |
|
|---|
| 3 | module.exports = {
|
|---|
| 4 | bufferSplit: bufferSplit,
|
|---|
| 5 | addRSAMissing: addRSAMissing,
|
|---|
| 6 | calculateDSAPublic: calculateDSAPublic,
|
|---|
| 7 | calculateED25519Public: calculateED25519Public,
|
|---|
| 8 | calculateX25519Public: calculateX25519Public,
|
|---|
| 9 | mpNormalize: mpNormalize,
|
|---|
| 10 | mpDenormalize: mpDenormalize,
|
|---|
| 11 | ecNormalize: ecNormalize,
|
|---|
| 12 | countZeros: countZeros,
|
|---|
| 13 | assertCompatible: assertCompatible,
|
|---|
| 14 | isCompatible: isCompatible,
|
|---|
| 15 | opensslKeyDeriv: opensslKeyDeriv,
|
|---|
| 16 | opensshCipherInfo: opensshCipherInfo,
|
|---|
| 17 | publicFromPrivateECDSA: publicFromPrivateECDSA,
|
|---|
| 18 | zeroPadToLength: zeroPadToLength,
|
|---|
| 19 | writeBitString: writeBitString,
|
|---|
| 20 | readBitString: readBitString,
|
|---|
| 21 | pbkdf2: pbkdf2
|
|---|
| 22 | };
|
|---|
| 23 |
|
|---|
| 24 | var assert = require('assert-plus');
|
|---|
| 25 | var Buffer = require('safer-buffer').Buffer;
|
|---|
| 26 | var PrivateKey = require('./private-key');
|
|---|
| 27 | var Key = require('./key');
|
|---|
| 28 | var crypto = require('crypto');
|
|---|
| 29 | var algs = require('./algs');
|
|---|
| 30 | var asn1 = require('asn1');
|
|---|
| 31 |
|
|---|
| 32 | var ec = require('ecc-jsbn/lib/ec');
|
|---|
| 33 | var jsbn = require('jsbn').BigInteger;
|
|---|
| 34 | var nacl = require('tweetnacl');
|
|---|
| 35 |
|
|---|
| 36 | var MAX_CLASS_DEPTH = 3;
|
|---|
| 37 |
|
|---|
| 38 | function isCompatible(obj, klass, needVer) {
|
|---|
| 39 | if (obj === null || typeof (obj) !== 'object')
|
|---|
| 40 | return (false);
|
|---|
| 41 | if (needVer === undefined)
|
|---|
| 42 | needVer = klass.prototype._sshpkApiVersion;
|
|---|
| 43 | if (obj instanceof klass &&
|
|---|
| 44 | klass.prototype._sshpkApiVersion[0] == needVer[0])
|
|---|
| 45 | return (true);
|
|---|
| 46 | var proto = Object.getPrototypeOf(obj);
|
|---|
| 47 | var depth = 0;
|
|---|
| 48 | while (proto.constructor.name !== klass.name) {
|
|---|
| 49 | proto = Object.getPrototypeOf(proto);
|
|---|
| 50 | if (!proto || ++depth > MAX_CLASS_DEPTH)
|
|---|
| 51 | return (false);
|
|---|
| 52 | }
|
|---|
| 53 | if (proto.constructor.name !== klass.name)
|
|---|
| 54 | return (false);
|
|---|
| 55 | var ver = proto._sshpkApiVersion;
|
|---|
| 56 | if (ver === undefined)
|
|---|
| 57 | ver = klass._oldVersionDetect(obj);
|
|---|
| 58 | if (ver[0] != needVer[0] || ver[1] < needVer[1])
|
|---|
| 59 | return (false);
|
|---|
| 60 | return (true);
|
|---|
| 61 | }
|
|---|
| 62 |
|
|---|
| 63 | function assertCompatible(obj, klass, needVer, name) {
|
|---|
| 64 | if (name === undefined)
|
|---|
| 65 | name = 'object';
|
|---|
| 66 | assert.ok(obj, name + ' must not be null');
|
|---|
| 67 | assert.object(obj, name + ' must be an object');
|
|---|
| 68 | if (needVer === undefined)
|
|---|
| 69 | needVer = klass.prototype._sshpkApiVersion;
|
|---|
| 70 | if (obj instanceof klass &&
|
|---|
| 71 | klass.prototype._sshpkApiVersion[0] == needVer[0])
|
|---|
| 72 | return;
|
|---|
| 73 | var proto = Object.getPrototypeOf(obj);
|
|---|
| 74 | var depth = 0;
|
|---|
| 75 | while (proto.constructor.name !== klass.name) {
|
|---|
| 76 | proto = Object.getPrototypeOf(proto);
|
|---|
| 77 | assert.ok(proto && ++depth <= MAX_CLASS_DEPTH,
|
|---|
| 78 | name + ' must be a ' + klass.name + ' instance');
|
|---|
| 79 | }
|
|---|
| 80 | assert.strictEqual(proto.constructor.name, klass.name,
|
|---|
| 81 | name + ' must be a ' + klass.name + ' instance');
|
|---|
| 82 | var ver = proto._sshpkApiVersion;
|
|---|
| 83 | if (ver === undefined)
|
|---|
| 84 | ver = klass._oldVersionDetect(obj);
|
|---|
| 85 | assert.ok(ver[0] == needVer[0] && ver[1] >= needVer[1],
|
|---|
| 86 | name + ' must be compatible with ' + klass.name + ' klass ' +
|
|---|
| 87 | 'version ' + needVer[0] + '.' + needVer[1]);
|
|---|
| 88 | }
|
|---|
| 89 |
|
|---|
| 90 | var CIPHER_LEN = {
|
|---|
| 91 | 'des-ede3-cbc': { key: 24, iv: 8 },
|
|---|
| 92 | 'aes-128-cbc': { key: 16, iv: 16 },
|
|---|
| 93 | 'aes-256-cbc': { key: 32, iv: 16 }
|
|---|
| 94 | };
|
|---|
| 95 | var PKCS5_SALT_LEN = 8;
|
|---|
| 96 |
|
|---|
| 97 | function opensslKeyDeriv(cipher, salt, passphrase, count) {
|
|---|
| 98 | assert.buffer(salt, 'salt');
|
|---|
| 99 | assert.buffer(passphrase, 'passphrase');
|
|---|
| 100 | assert.number(count, 'iteration count');
|
|---|
| 101 |
|
|---|
| 102 | var clen = CIPHER_LEN[cipher];
|
|---|
| 103 | assert.object(clen, 'supported cipher');
|
|---|
| 104 |
|
|---|
| 105 | salt = salt.slice(0, PKCS5_SALT_LEN);
|
|---|
| 106 |
|
|---|
| 107 | var D, D_prev, bufs;
|
|---|
| 108 | var material = Buffer.alloc(0);
|
|---|
| 109 | while (material.length < clen.key + clen.iv) {
|
|---|
| 110 | bufs = [];
|
|---|
| 111 | if (D_prev)
|
|---|
| 112 | bufs.push(D_prev);
|
|---|
| 113 | bufs.push(passphrase);
|
|---|
| 114 | bufs.push(salt);
|
|---|
| 115 | D = Buffer.concat(bufs);
|
|---|
| 116 | for (var j = 0; j < count; ++j)
|
|---|
| 117 | D = crypto.createHash('md5').update(D).digest();
|
|---|
| 118 | material = Buffer.concat([material, D]);
|
|---|
| 119 | D_prev = D;
|
|---|
| 120 | }
|
|---|
| 121 |
|
|---|
| 122 | return ({
|
|---|
| 123 | key: material.slice(0, clen.key),
|
|---|
| 124 | iv: material.slice(clen.key, clen.key + clen.iv)
|
|---|
| 125 | });
|
|---|
| 126 | }
|
|---|
| 127 |
|
|---|
| 128 | /* See: RFC2898 */
|
|---|
| 129 | function pbkdf2(hashAlg, salt, iterations, size, passphrase) {
|
|---|
| 130 | var hkey = Buffer.alloc(salt.length + 4);
|
|---|
| 131 | salt.copy(hkey);
|
|---|
| 132 |
|
|---|
| 133 | var gen = 0, ts = [];
|
|---|
| 134 | var i = 1;
|
|---|
| 135 | while (gen < size) {
|
|---|
| 136 | var t = T(i++);
|
|---|
| 137 | gen += t.length;
|
|---|
| 138 | ts.push(t);
|
|---|
| 139 | }
|
|---|
| 140 | return (Buffer.concat(ts).slice(0, size));
|
|---|
| 141 |
|
|---|
| 142 | function T(I) {
|
|---|
| 143 | hkey.writeUInt32BE(I, hkey.length - 4);
|
|---|
| 144 |
|
|---|
| 145 | var hmac = crypto.createHmac(hashAlg, passphrase);
|
|---|
| 146 | hmac.update(hkey);
|
|---|
| 147 |
|
|---|
| 148 | var Ti = hmac.digest();
|
|---|
| 149 | var Uc = Ti;
|
|---|
| 150 | var c = 1;
|
|---|
| 151 | while (c++ < iterations) {
|
|---|
| 152 | hmac = crypto.createHmac(hashAlg, passphrase);
|
|---|
| 153 | hmac.update(Uc);
|
|---|
| 154 | Uc = hmac.digest();
|
|---|
| 155 | for (var x = 0; x < Ti.length; ++x)
|
|---|
| 156 | Ti[x] ^= Uc[x];
|
|---|
| 157 | }
|
|---|
| 158 | return (Ti);
|
|---|
| 159 | }
|
|---|
| 160 | }
|
|---|
| 161 |
|
|---|
| 162 | /* Count leading zero bits on a buffer */
|
|---|
| 163 | function countZeros(buf) {
|
|---|
| 164 | var o = 0, obit = 8;
|
|---|
| 165 | while (o < buf.length) {
|
|---|
| 166 | var mask = (1 << obit);
|
|---|
| 167 | if ((buf[o] & mask) === mask)
|
|---|
| 168 | break;
|
|---|
| 169 | obit--;
|
|---|
| 170 | if (obit < 0) {
|
|---|
| 171 | o++;
|
|---|
| 172 | obit = 8;
|
|---|
| 173 | }
|
|---|
| 174 | }
|
|---|
| 175 | return (o*8 + (8 - obit) - 1);
|
|---|
| 176 | }
|
|---|
| 177 |
|
|---|
| 178 | function bufferSplit(buf, chr) {
|
|---|
| 179 | assert.buffer(buf);
|
|---|
| 180 | assert.string(chr);
|
|---|
| 181 |
|
|---|
| 182 | var parts = [];
|
|---|
| 183 | var lastPart = 0;
|
|---|
| 184 | var matches = 0;
|
|---|
| 185 | for (var i = 0; i < buf.length; ++i) {
|
|---|
| 186 | if (buf[i] === chr.charCodeAt(matches))
|
|---|
| 187 | ++matches;
|
|---|
| 188 | else if (buf[i] === chr.charCodeAt(0))
|
|---|
| 189 | matches = 1;
|
|---|
| 190 | else
|
|---|
| 191 | matches = 0;
|
|---|
| 192 |
|
|---|
| 193 | if (matches >= chr.length) {
|
|---|
| 194 | var newPart = i + 1;
|
|---|
| 195 | parts.push(buf.slice(lastPart, newPart - matches));
|
|---|
| 196 | lastPart = newPart;
|
|---|
| 197 | matches = 0;
|
|---|
| 198 | }
|
|---|
| 199 | }
|
|---|
| 200 | if (lastPart <= buf.length)
|
|---|
| 201 | parts.push(buf.slice(lastPart, buf.length));
|
|---|
| 202 |
|
|---|
| 203 | return (parts);
|
|---|
| 204 | }
|
|---|
| 205 |
|
|---|
| 206 | function ecNormalize(buf, addZero) {
|
|---|
| 207 | assert.buffer(buf);
|
|---|
| 208 | if (buf[0] === 0x00 && buf[1] === 0x04) {
|
|---|
| 209 | if (addZero)
|
|---|
| 210 | return (buf);
|
|---|
| 211 | return (buf.slice(1));
|
|---|
| 212 | } else if (buf[0] === 0x04) {
|
|---|
| 213 | if (!addZero)
|
|---|
| 214 | return (buf);
|
|---|
| 215 | } else {
|
|---|
| 216 | while (buf[0] === 0x00)
|
|---|
| 217 | buf = buf.slice(1);
|
|---|
| 218 | if (buf[0] === 0x02 || buf[0] === 0x03)
|
|---|
| 219 | throw (new Error('Compressed elliptic curve points ' +
|
|---|
| 220 | 'are not supported'));
|
|---|
| 221 | if (buf[0] !== 0x04)
|
|---|
| 222 | throw (new Error('Not a valid elliptic curve point'));
|
|---|
| 223 | if (!addZero)
|
|---|
| 224 | return (buf);
|
|---|
| 225 | }
|
|---|
| 226 | var b = Buffer.alloc(buf.length + 1);
|
|---|
| 227 | b[0] = 0x0;
|
|---|
| 228 | buf.copy(b, 1);
|
|---|
| 229 | return (b);
|
|---|
| 230 | }
|
|---|
| 231 |
|
|---|
| 232 | function readBitString(der, tag) {
|
|---|
| 233 | if (tag === undefined)
|
|---|
| 234 | tag = asn1.Ber.BitString;
|
|---|
| 235 | var buf = der.readString(tag, true);
|
|---|
| 236 | assert.strictEqual(buf[0], 0x00, 'bit strings with unused bits are ' +
|
|---|
| 237 | 'not supported (0x' + buf[0].toString(16) + ')');
|
|---|
| 238 | return (buf.slice(1));
|
|---|
| 239 | }
|
|---|
| 240 |
|
|---|
| 241 | function writeBitString(der, buf, tag) {
|
|---|
| 242 | if (tag === undefined)
|
|---|
| 243 | tag = asn1.Ber.BitString;
|
|---|
| 244 | var b = Buffer.alloc(buf.length + 1);
|
|---|
| 245 | b[0] = 0x00;
|
|---|
| 246 | buf.copy(b, 1);
|
|---|
| 247 | der.writeBuffer(b, tag);
|
|---|
| 248 | }
|
|---|
| 249 |
|
|---|
| 250 | function mpNormalize(buf) {
|
|---|
| 251 | assert.buffer(buf);
|
|---|
| 252 | while (buf.length > 1 && buf[0] === 0x00 && (buf[1] & 0x80) === 0x00)
|
|---|
| 253 | buf = buf.slice(1);
|
|---|
| 254 | if ((buf[0] & 0x80) === 0x80) {
|
|---|
| 255 | var b = Buffer.alloc(buf.length + 1);
|
|---|
| 256 | b[0] = 0x00;
|
|---|
| 257 | buf.copy(b, 1);
|
|---|
| 258 | buf = b;
|
|---|
| 259 | }
|
|---|
| 260 | return (buf);
|
|---|
| 261 | }
|
|---|
| 262 |
|
|---|
| 263 | function mpDenormalize(buf) {
|
|---|
| 264 | assert.buffer(buf);
|
|---|
| 265 | while (buf.length > 1 && buf[0] === 0x00)
|
|---|
| 266 | buf = buf.slice(1);
|
|---|
| 267 | return (buf);
|
|---|
| 268 | }
|
|---|
| 269 |
|
|---|
| 270 | function zeroPadToLength(buf, len) {
|
|---|
| 271 | assert.buffer(buf);
|
|---|
| 272 | assert.number(len);
|
|---|
| 273 | while (buf.length > len) {
|
|---|
| 274 | assert.equal(buf[0], 0x00);
|
|---|
| 275 | buf = buf.slice(1);
|
|---|
| 276 | }
|
|---|
| 277 | while (buf.length < len) {
|
|---|
| 278 | var b = Buffer.alloc(buf.length + 1);
|
|---|
| 279 | b[0] = 0x00;
|
|---|
| 280 | buf.copy(b, 1);
|
|---|
| 281 | buf = b;
|
|---|
| 282 | }
|
|---|
| 283 | return (buf);
|
|---|
| 284 | }
|
|---|
| 285 |
|
|---|
| 286 | function bigintToMpBuf(bigint) {
|
|---|
| 287 | var buf = Buffer.from(bigint.toByteArray());
|
|---|
| 288 | buf = mpNormalize(buf);
|
|---|
| 289 | return (buf);
|
|---|
| 290 | }
|
|---|
| 291 |
|
|---|
| 292 | function calculateDSAPublic(g, p, x) {
|
|---|
| 293 | assert.buffer(g);
|
|---|
| 294 | assert.buffer(p);
|
|---|
| 295 | assert.buffer(x);
|
|---|
| 296 | g = new jsbn(g);
|
|---|
| 297 | p = new jsbn(p);
|
|---|
| 298 | x = new jsbn(x);
|
|---|
| 299 | var y = g.modPow(x, p);
|
|---|
| 300 | var ybuf = bigintToMpBuf(y);
|
|---|
| 301 | return (ybuf);
|
|---|
| 302 | }
|
|---|
| 303 |
|
|---|
| 304 | function calculateED25519Public(k) {
|
|---|
| 305 | assert.buffer(k);
|
|---|
| 306 |
|
|---|
| 307 | var kp = nacl.sign.keyPair.fromSeed(new Uint8Array(k));
|
|---|
| 308 | return (Buffer.from(kp.publicKey));
|
|---|
| 309 | }
|
|---|
| 310 |
|
|---|
| 311 | function calculateX25519Public(k) {
|
|---|
| 312 | assert.buffer(k);
|
|---|
| 313 |
|
|---|
| 314 | var kp = nacl.box.keyPair.fromSeed(new Uint8Array(k));
|
|---|
| 315 | return (Buffer.from(kp.publicKey));
|
|---|
| 316 | }
|
|---|
| 317 |
|
|---|
| 318 | function addRSAMissing(key) {
|
|---|
| 319 | assert.object(key);
|
|---|
| 320 | assertCompatible(key, PrivateKey, [1, 1]);
|
|---|
| 321 |
|
|---|
| 322 | var d = new jsbn(key.part.d.data);
|
|---|
| 323 | var buf;
|
|---|
| 324 |
|
|---|
| 325 | if (!key.part.dmodp) {
|
|---|
| 326 | var p = new jsbn(key.part.p.data);
|
|---|
| 327 | var dmodp = d.mod(p.subtract(1));
|
|---|
| 328 |
|
|---|
| 329 | buf = bigintToMpBuf(dmodp);
|
|---|
| 330 | key.part.dmodp = {name: 'dmodp', data: buf};
|
|---|
| 331 | key.parts.push(key.part.dmodp);
|
|---|
| 332 | }
|
|---|
| 333 | if (!key.part.dmodq) {
|
|---|
| 334 | var q = new jsbn(key.part.q.data);
|
|---|
| 335 | var dmodq = d.mod(q.subtract(1));
|
|---|
| 336 |
|
|---|
| 337 | buf = bigintToMpBuf(dmodq);
|
|---|
| 338 | key.part.dmodq = {name: 'dmodq', data: buf};
|
|---|
| 339 | key.parts.push(key.part.dmodq);
|
|---|
| 340 | }
|
|---|
| 341 | }
|
|---|
| 342 |
|
|---|
| 343 | function publicFromPrivateECDSA(curveName, priv) {
|
|---|
| 344 | assert.string(curveName, 'curveName');
|
|---|
| 345 | assert.buffer(priv);
|
|---|
| 346 | var params = algs.curves[curveName];
|
|---|
| 347 | var p = new jsbn(params.p);
|
|---|
| 348 | var a = new jsbn(params.a);
|
|---|
| 349 | var b = new jsbn(params.b);
|
|---|
| 350 | var curve = new ec.ECCurveFp(p, a, b);
|
|---|
| 351 | var G = curve.decodePointHex(params.G.toString('hex'));
|
|---|
| 352 |
|
|---|
| 353 | var d = new jsbn(mpNormalize(priv));
|
|---|
| 354 | var pub = G.multiply(d);
|
|---|
| 355 | pub = Buffer.from(curve.encodePointHex(pub), 'hex');
|
|---|
| 356 |
|
|---|
| 357 | var parts = [];
|
|---|
| 358 | parts.push({name: 'curve', data: Buffer.from(curveName)});
|
|---|
| 359 | parts.push({name: 'Q', data: pub});
|
|---|
| 360 |
|
|---|
| 361 | var key = new Key({type: 'ecdsa', curve: curve, parts: parts});
|
|---|
| 362 | return (key);
|
|---|
| 363 | }
|
|---|
| 364 |
|
|---|
| 365 | function opensshCipherInfo(cipher) {
|
|---|
| 366 | var inf = {};
|
|---|
| 367 | switch (cipher) {
|
|---|
| 368 | case '3des-cbc':
|
|---|
| 369 | inf.keySize = 24;
|
|---|
| 370 | inf.blockSize = 8;
|
|---|
| 371 | inf.opensslName = 'des-ede3-cbc';
|
|---|
| 372 | break;
|
|---|
| 373 | case 'blowfish-cbc':
|
|---|
| 374 | inf.keySize = 16;
|
|---|
| 375 | inf.blockSize = 8;
|
|---|
| 376 | inf.opensslName = 'bf-cbc';
|
|---|
| 377 | break;
|
|---|
| 378 | case 'aes128-cbc':
|
|---|
| 379 | case 'aes128-ctr':
|
|---|
| 380 | case 'aes128-gcm@openssh.com':
|
|---|
| 381 | inf.keySize = 16;
|
|---|
| 382 | inf.blockSize = 16;
|
|---|
| 383 | inf.opensslName = 'aes-128-' + cipher.slice(7, 10);
|
|---|
| 384 | break;
|
|---|
| 385 | case 'aes192-cbc':
|
|---|
| 386 | case 'aes192-ctr':
|
|---|
| 387 | case 'aes192-gcm@openssh.com':
|
|---|
| 388 | inf.keySize = 24;
|
|---|
| 389 | inf.blockSize = 16;
|
|---|
| 390 | inf.opensslName = 'aes-192-' + cipher.slice(7, 10);
|
|---|
| 391 | break;
|
|---|
| 392 | case 'aes256-cbc':
|
|---|
| 393 | case 'aes256-ctr':
|
|---|
| 394 | case 'aes256-gcm@openssh.com':
|
|---|
| 395 | inf.keySize = 32;
|
|---|
| 396 | inf.blockSize = 16;
|
|---|
| 397 | inf.opensslName = 'aes-256-' + cipher.slice(7, 10);
|
|---|
| 398 | break;
|
|---|
| 399 | default:
|
|---|
| 400 | throw (new Error(
|
|---|
| 401 | 'Unsupported openssl cipher "' + cipher + '"'));
|
|---|
| 402 | }
|
|---|
| 403 | return (inf);
|
|---|
| 404 | }
|
|---|
