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// Copyright 2018 Joyent, Inc.
module.exports = {
read: read,
write: write
};
var assert = require('assert-plus');
var asn1 = require('asn1');
var crypto = require('crypto');
var Buffer = require('safer-buffer').Buffer;
var algs = require('../algs');
var utils = require('../utils');
var Key = require('../key');
var PrivateKey = require('../private-key');
var pkcs1 = require('./pkcs1');
var pkcs8 = require('./pkcs8');
var sshpriv = require('./ssh-private');
var rfc4253 = require('./rfc4253');
var errors = require('../errors');
var OID_PBES2 = '1.2.840.113549.1.5.13';
var OID_PBKDF2 = '1.2.840.113549.1.5.12';
var OID_TO_CIPHER = {
'1.2.840.113549.3.7': '3des-cbc',
'2.16.840.1.101.3.4.1.2': 'aes128-cbc',
'2.16.840.1.101.3.4.1.42': 'aes256-cbc'
};
var CIPHER_TO_OID = {};
Object.keys(OID_TO_CIPHER).forEach(function (k) {
CIPHER_TO_OID[OID_TO_CIPHER[k]] = k;
});
var OID_TO_HASH = {
'1.2.840.113549.2.7': 'sha1',
'1.2.840.113549.2.9': 'sha256',
'1.2.840.113549.2.11': 'sha512'
};
var HASH_TO_OID = {};
Object.keys(OID_TO_HASH).forEach(function (k) {
HASH_TO_OID[OID_TO_HASH[k]] = k;
});
/*
* For reading we support both PKCS#1 and PKCS#8. If we find a private key,
* we just take the public component of it and use that.
*/
function read(buf, options, forceType) {
var input = buf;
if (typeof (buf) !== 'string') {
assert.buffer(buf, 'buf');
buf = buf.toString('ascii');
}
var lines = buf.trim().split(/[\r\n]+/g);
var m;
var si = -1;
while (!m && si < lines.length) {
m = lines[++si].match(/*JSSTYLED*/
/[-]+[ ]*BEGIN ([A-Z0-9][A-Za-z0-9]+ )?(PUBLIC|PRIVATE) KEY[ ]*[-]+/);
}
assert.ok(m, 'invalid PEM header');
var m2;
var ei = lines.length;
while (!m2 && ei > 0) {
m2 = lines[--ei].match(/*JSSTYLED*/
/[-]+[ ]*END ([A-Z0-9][A-Za-z0-9]+ )?(PUBLIC|PRIVATE) KEY[ ]*[-]+/);
}
assert.ok(m2, 'invalid PEM footer');
/* Begin and end banners must match key type */
assert.equal(m[2], m2[2]);
var type = m[2].toLowerCase();
var alg;
if (m[1]) {
/* They also must match algorithms, if given */
assert.equal(m[1], m2[1], 'PEM header and footer mismatch');
alg = m[1].trim();
}
lines = lines.slice(si, ei + 1);
var headers = {};
while (true) {
lines = lines.slice(1);
m = lines[0].match(/*JSSTYLED*/
/^([A-Za-z0-9-]+): (.+)$/);
if (!m)
break;
headers[m[1].toLowerCase()] = m[2];
}
/* Chop off the first and last lines */
lines = lines.slice(0, -1).join('');
buf = Buffer.from(lines, 'base64');
var cipher, key, iv;
if (headers['proc-type']) {
var parts = headers['proc-type'].split(',');
if (parts[0] === '4' && parts[1] === 'ENCRYPTED') {
if (typeof (options.passphrase) === 'string') {
options.passphrase = Buffer.from(
options.passphrase, 'utf-8');
}
if (!Buffer.isBuffer(options.passphrase)) {
throw (new errors.KeyEncryptedError(
options.filename, 'PEM'));
} else {
parts = headers['dek-info'].split(',');
assert.ok(parts.length === 2);
cipher = parts[0].toLowerCase();
iv = Buffer.from(parts[1], 'hex');
key = utils.opensslKeyDeriv(cipher, iv,
options.passphrase, 1).key;
}
}
}
if (alg && alg.toLowerCase() === 'encrypted') {
var eder = new asn1.BerReader(buf);
var pbesEnd;
eder.readSequence();
eder.readSequence();
pbesEnd = eder.offset + eder.length;
var method = eder.readOID();
if (method !== OID_PBES2) {
throw (new Error('Unsupported PEM/PKCS8 encryption ' +
'scheme: ' + method));
}
eder.readSequence(); /* PBES2-params */
eder.readSequence(); /* keyDerivationFunc */
var kdfEnd = eder.offset + eder.length;
var kdfOid = eder.readOID();
if (kdfOid !== OID_PBKDF2)
throw (new Error('Unsupported PBES2 KDF: ' + kdfOid));
eder.readSequence();
var salt = eder.readString(asn1.Ber.OctetString, true);
var iterations = eder.readInt();
var hashAlg = 'sha1';
if (eder.offset < kdfEnd) {
eder.readSequence();
var hashAlgOid = eder.readOID();
hashAlg = OID_TO_HASH[hashAlgOid];
if (hashAlg === undefined) {
throw (new Error('Unsupported PBKDF2 hash: ' +
hashAlgOid));
}
}
eder._offset = kdfEnd;
eder.readSequence(); /* encryptionScheme */
var cipherOid = eder.readOID();
cipher = OID_TO_CIPHER[cipherOid];
if (cipher === undefined) {
throw (new Error('Unsupported PBES2 cipher: ' +
cipherOid));
}
iv = eder.readString(asn1.Ber.OctetString, true);
eder._offset = pbesEnd;
buf = eder.readString(asn1.Ber.OctetString, true);
if (typeof (options.passphrase) === 'string') {
options.passphrase = Buffer.from(
options.passphrase, 'utf-8');
}
if (!Buffer.isBuffer(options.passphrase)) {
throw (new errors.KeyEncryptedError(
options.filename, 'PEM'));
}
var cinfo = utils.opensshCipherInfo(cipher);
cipher = cinfo.opensslName;
key = utils.pbkdf2(hashAlg, salt, iterations, cinfo.keySize,
options.passphrase);
alg = undefined;
}
if (cipher && key && iv) {
var cipherStream = crypto.createDecipheriv(cipher, key, iv);
var chunk, chunks = [];
cipherStream.once('error', function (e) {
if (e.toString().indexOf('bad decrypt') !== -1) {
throw (new Error('Incorrect passphrase ' +
'supplied, could not decrypt key'));
}
throw (e);
});
cipherStream.write(buf);
cipherStream.end();
while ((chunk = cipherStream.read()) !== null)
chunks.push(chunk);
buf = Buffer.concat(chunks);
}
/* The new OpenSSH internal format abuses PEM headers */
if (alg && alg.toLowerCase() === 'openssh')
return (sshpriv.readSSHPrivate(type, buf, options));
if (alg && alg.toLowerCase() === 'ssh2')
return (rfc4253.readType(type, buf, options));
var der = new asn1.BerReader(buf);
der.originalInput = input;
/*
* All of the PEM file types start with a sequence tag, so chop it
* off here
*/
der.readSequence();
/* PKCS#1 type keys name an algorithm in the banner explicitly */
if (alg) {
if (forceType)
assert.strictEqual(forceType, 'pkcs1');
return (pkcs1.readPkcs1(alg, type, der));
} else {
if (forceType)
assert.strictEqual(forceType, 'pkcs8');
return (pkcs8.readPkcs8(alg, type, der));
}
}
function write(key, options, type) {
assert.object(key);
var alg = {
'ecdsa': 'EC',
'rsa': 'RSA',
'dsa': 'DSA',
'ed25519': 'EdDSA'
}[key.type];
var header;
var der = new asn1.BerWriter();
if (PrivateKey.isPrivateKey(key)) {
if (type && type === 'pkcs8') {
header = 'PRIVATE KEY';
pkcs8.writePkcs8(der, key);
} else {
if (type)
assert.strictEqual(type, 'pkcs1');
header = alg + ' PRIVATE KEY';
pkcs1.writePkcs1(der, key);
}
} else if (Key.isKey(key)) {
if (type && type === 'pkcs1') {
header = alg + ' PUBLIC KEY';
pkcs1.writePkcs1(der, key);
} else {
if (type)
assert.strictEqual(type, 'pkcs8');
header = 'PUBLIC KEY';
pkcs8.writePkcs8(der, key);
}
} else {
throw (new Error('key is not a Key or PrivateKey'));
}
var tmp = der.buffer.toString('base64');
var len = tmp.length + (tmp.length / 64) +
18 + 16 + header.length*2 + 10;
var buf = Buffer.alloc(len);
var o = 0;
o += buf.write('-----BEGIN ' + header + '-----\n', o);
for (var i = 0; i < tmp.length; ) {
var limit = i + 64;
if (limit > tmp.length)
limit = tmp.length;
o += buf.write(tmp.slice(i, limit), o);
buf[o++] = 10;
i = limit;
}
o += buf.write('-----END ' + header + '-----\n', o);
return (buf.slice(0, o));
}