node-sshpk#27 PuTTY private key support (#76)

Reviewed by: Alex Wilson
Reviewed by: Brian Bennett

lib/formats/putty.js

@@ -9,20 +9,30 @@ var assert = require('assert-plus');
 var Buffer = require('safer-buffer').Buffer;
 var rfc4253 = require('./rfc4253');
 var Key = require('../key');
+var SSHBuffer = require('../ssh-buffer');
+var crypto = require('crypto');
+var PrivateKey = require('../private-key');
 
 var errors = require('../errors');
 
+// https://tartarus.org/~simon/putty-prerel-snapshots/htmldoc/AppendixC.html
 function read(buf, options) {
 	var lines = buf.toString('ascii').split(/[\r\n]+/);
 	var found = false;
 	var parts;
 	var si = 0;
+	var formatVersion;
 	while (si < lines.length) {
 		parts = splitHeader(lines[si++]);
-		if (parts &&
-		    parts[0].toLowerCase() === 'putty-user-key-file-2') {
-			found = true;
-			break;
+		if (parts) {
+			formatVersion = {
+				'putty-user-key-file-2': 2,
+				'putty-user-key-file-3': 3,
+			}[parts[0].toLowerCase()]
+			if (formatVersion) {
+				found = true;
+				break;
+			}
 		}
 	}
 	if (!found) {
@@ -32,6 +42,7 @@ function read(buf, options) {
 
 	parts = splitHeader(lines[si++]);
 	assert.equal(parts[0].toLowerCase(), 'encryption');
+	var encryption = parts[1];
 
 	parts = splitHeader(lines[si++]);
 	assert.equal(parts[0].toLowerCase(), 'comment');
@@ -52,10 +63,93 @@ function read(buf, options) {
 	if (key.type !== keyType) {
 		throw (new Error('Outer key algorithm mismatch'));
 	}
+
+	si += publicLines;
+	if (lines[si]) {
+		parts = splitHeader(lines[si++]);
+		assert.equal(parts[0].toLowerCase(), 'private-lines');
+		var privateLines = parseInt(parts[1], 10);
+		if (!isFinite(privateLines) || privateLines < 0 ||
+		    privateLines > lines.length) {
+			throw (new Error('Invalid private-lines count'));
+		}
+
+		var privateBuf = Buffer.from(
+			lines.slice(si, si + privateLines).join(''), 'base64');
+
+		if (encryption !== 'none' && formatVersion === 3) {
+			throw new Error('Encrypted keys arenot supported for PuTTY format version 3');
+		}
+
+		if (encryption === 'aes256-cbc') {
+			if (!options.passphrase) {
+				throw (new errors.KeyEncryptedError(
+					options.filename, 'PEM'));
+			}
+
+			var iv = Buffer.alloc(16, 0);
+			var decipher = crypto.createDecipheriv(
+				'aes-256-cbc',
+				derivePPK2EncryptionKey(options.passphrase),
+				iv);
+			decipher.setAutoPadding(false);
+			privateBuf = Buffer.concat([
+				decipher.update(privateBuf), decipher.final()]);
+		}
+
+		key = new PrivateKey(key);
+		if (key.type !== keyType) {
+			throw (new Error('Outer key algorithm mismatch'));
+		}
+
+		var sshbuf = new SSHBuffer({buffer: privateBuf});
+		var privateKeyParts;
+		if (alg === 'ssh-dss') {
+			privateKeyParts = [ {
+				name: 'x',
+				data: sshbuf.readBuffer()
+			}];
+		} else if (alg === 'ssh-rsa') {
+			privateKeyParts = [
+				{ name: 'd', data: sshbuf.readBuffer() },
+				{ name: 'p', data: sshbuf.readBuffer() },
+				{ name: 'q', data: sshbuf.readBuffer() },
+				{ name: 'iqmp', data: sshbuf.readBuffer() }
+			];
+		} else if (alg.startsWith('ecdsa-sha2-nistp')) {
+			privateKeyParts = [ {
+				name: 'd', data: sshbuf.readBuffer()
+			} ];
+		} else if (alg === 'ssh-ed25519') {
+			privateKeyParts = [ {
+				name: 'k', data: sshbuf.readBuffer()
+			} ];
+		} else {
+			throw new Error('Unsupported PPK key type: ' + alg);
+		}
+
+		key = new PrivateKey({
+			type: key.type,
+			parts: key.parts.concat(privateKeyParts)
+		});
+	}
+
 	key.comment = comment;
 	return (key);
 }
 
+function derivePPK2EncryptionKey(passphrase) {
+	var hash1 = crypto.createHash('sha1').update(Buffer.concat([
+		Buffer.from([0, 0, 0, 0]),
+		Buffer.from(passphrase)
+	])).digest();
+	var hash2 = crypto.createHash('sha1').update(Buffer.concat([
+		Buffer.from([0, 0, 0, 1]),
+		Buffer.from(passphrase)
+	])).digest();
+	return (Buffer.concat([hash1, hash2]).slice(0, 32));
+}
+
 function splitHeader(line) {
 	var idx = line.indexOf(':');
 	if (idx === -1)

lib/private-key.js

@@ -33,6 +33,7 @@ formats['ssh-private'] = require('./formats/ssh-private');
 formats['openssh'] = formats['ssh-private'];
 formats['ssh'] = formats['ssh-private'];
 formats['dnssec'] = require('./formats/dnssec');
+formats['putty'] = require('./formats/putty');
 
 function PrivateKey(opts) {
 	assert.object(opts, 'options');

test/assets/dsa-ppk

@@ -0,0 +1,20 @@
+-----BEGIN DSA PRIVATE KEY-----
+MIIDPQIBAAKCAQEAm6ofqHnQBzlOXYK2o0o9eZi1YtmHksmdRefKAYpsIvO/OwMP
+6fLva+9TkUMdgu+B2n0w2vdbh1Qo1QtwRAiq9CKwY1iuK2CfciytvuYsKfLVTsgw
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+RZDiU9h5rb9FJLrdgGgn6P8XIjJ7e3+P21EL0mi63sRQFQHfLEwA8F3UgQIUJ2Qi
+WkIsuhpeOTgyMLX2FWXPHZk=
+-----END DSA PRIVATE KEY-----

test/assets/dsa-pub.ppk

@@ -1,22 +1,22 @@
 PuTTY-User-Key-File-2: ssh-dss
 Encryption: none
-Comment: dsa-key-20170331
+Comment: dsa-key-20210515
 Public-Lines: 18
-AAAAB3NzaC1kc3MAAAEBALPLp37KKWyxxCtV085ozT7tY1zQimFhPvD+rPO4SSfH
-quoRM/szwOXAqyavqYggajNyzSN/x5+gLu4p2iTmS0jC0Nf2FB5tyqxBKsrubmhV
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-gg5I
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+gQ==

test/assets/dsa.ppk

@@ -1,25 +1,25 @@
 PuTTY-User-Key-File-2: ssh-dss
 Encryption: aes256-cbc
-Comment: dsa-key-20170331
+Comment: dsa-key-20210515
 Public-Lines: 18
-AAAAB3NzaC1kc3MAAAEBALPLp37KKWyxxCtV085ozT7tY1zQimFhPvD+rPO4SSfH
-quoRM/szwOXAqyavqYggajNyzSN/x5+gLu4p2iTmS0jC0Nf2FB5tyqxBKsrubmhV
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+gQ==
 Private-Lines: 1
-KSl/bN/cgkBjVRhd91zBbTlSPNqRwQJ5xDF4qrehUtQ=
-Private-MAC: 3ab460bd517d8f4747f837a37710f88ad95be6ea
+ony1aHwujzT0bx1MCaH55NpCy6K/L+/rKAeb5CBF/D4=
+Private-MAC: 0e1508506fff981e5042d029429bfcb5765e80ba

test/assets/ecdsa-ppk

@@ -0,0 +1,5 @@
+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEIH6319TQpT2OtWoyurNrC8t8RTMnKGkuF7Hg+iRAHaO5oAoGCCqGSM49
+AwEHoUQDQgAEKK8I4bJpFBon3SvTLM+ZMnXZIHgUHluna7SQP/XlrwGkNweyjUYg
+iMHJjYbrnkdH1BeQ4MaZNM8yFVmnhQoLAw==
+-----END EC PRIVATE KEY-----

test/assets/ecdsa.ppk

@@ -0,0 +1,10 @@
+PuTTY-User-Key-File-2: ecdsa-sha2-nistp256
+Encryption: aes256-cbc
+Comment: ecdsa-key-20210515
+Public-Lines: 3
+AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBCivCOGyaRQa
+J90r0yzPmTJ12SB4FB5bp2u0kD/15a8BpDcHso1GIIjByY2G655HR9QXkODGmTTP
+MhVZp4UKCwM=
+Private-Lines: 1
+MW4fcSm+yRUR/19z3GrDV0dbjweegsEoWNIswwALYas8sV0l4S2k+b41qXuflP9N
+Private-MAC: 18146097d09025727b6facc1102aae201bd18364

test/assets/ed25519-ppk

@@ -0,0 +1,4 @@
+-----BEGIN EdDSA PRIVATE KEY-----
+MFECAQEEIJ4V2rGkAcGHBQnspmDrWJ9yncXAhJRi4NeE2FsQb0xMoAUGAytlcKEj
+AyEAVMkgHj6fUvLKiElOBtIMY27CldSJoLaTy0gmKs9rbIM=
+-----END EdDSA PRIVATE KEY-----

test/assets/ed25519.ppk

@@ -0,0 +1,9 @@
+PuTTY-User-Key-File-2: ssh-ed25519
+Encryption: aes256-cbc
+Comment: ed25519-key-20210515
+Public-Lines: 2
+AAAAC3NzaC1lZDI1NTE5AAAAIFTJIB4+n1LyyohJTgbSDGNuwpXUiaC2k8tIJirP
+a2yD
+Private-Lines: 1
+Sth4e+fEa1lawlgah31ocn4Imf2pnocHG7jArPG2UxWNwmm7lUYm/SLfb5spucPt
+Private-MAC: aeec318aa251a446fb1d6f18d6288a264f3d0b41

test/assets/ppk3

@@ -0,0 +1,26 @@
+PuTTY-User-Key-File-3: ssh-rsa
+Encryption: none
+Comment: rsa-key-20211214
+Public-Lines: 6
+AAAAB3NzaC1yc2EAAAADAQABAAABAQCQWPBUsyVmi5vl8myEQ91IP2JroWP1N2NR
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+Private-Lines: 14
+AAABACnnyA2u3ILCsQW2tU5IrWsWC6qXdf9wjwLksJnVTvMq1YacyCHXR3GMlMy+
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+6q7pVxMBPYqo4KWlhM4fN0ByY3kobFc2cAbLbck+x12C559LJr9RP3DHUQ9oxjB5
+JhYLgjN1JFS3dc7THi1nTM+NO0OQuytbeY+aNJ+UXW0zRtK/bwiGpsdGiFslgQAA
+AIAeH7hALcDaAiZs0Jsb4/39zuGlb27r+KesxkYgIy7DaAOvQyZaT3X0JrAwqRqs
+UJl+AS39VpL7XQFIbICJyhPbHHO3IGCUKhOz0BCqpHjnn9/ViRuNnrr1UTgDS0qc
+tw/JH+KlK94nGmMEjBUUJpXJqjAXR7x8feoTqjtvijQtjA==
+Private-MAC: a172468747b16c488815cb90b4359fe61d262c9a9329f60cabf6763deb638d8e

test/assets/ppk3.pem

@@ -0,0 +1,22 @@
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----

test/assets/rsa-ppk

@@ -0,0 +1,22 @@
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----