pure-js-sftp
Version:
A pure JavaScript SFTP client with revolutionary RSA-SHA2 compatibility fixes. Zero native dependencies, built on ssh2-streams with 100% SSH key support.
301 lines (275 loc) • 10.6 kB
JavaScript
"use strict";
/**
* Child Process Cryptographic Operations
* Shared utilities for crypto operations via child processes for VSCode compatibility
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.signWithSystemCrypto = signWithSystemCrypto;
exports.extractPublicKeyWithChildProcess = extractPublicKeyWithChildProcess;
exports.deriveBcryptPbkdfWithChildProcess = deriveBcryptPbkdfWithChildProcess;
exports.decryptWithChildProcess = decryptWithChildProcess;
const child_process_1 = require("child_process");
const fs_1 = require("fs");
/**
* Generate cryptographic signature using child process
* @param privateKey PEM-formatted private key
* @param passphrase Optional passphrase for encrypted keys
* @param data Data to sign
* @param keyType SSH key type (e.g., 'ssh-rsa', 'ssh-ed25519')
* @returns Signature buffer
*/
function signWithSystemCrypto(privateKey, passphrase, data, keyType) {
const tempFilename = '/tmp/ssh_sign_' + Math.random().toString(36).substring(7) + '.js';
const signingScript = `
const crypto = require('crypto');
try {
const input = JSON.parse(process.argv[2]);
const { privateKey, passphrase, data, keyType } = input;
// Determine hash algorithm based on SSH key type
function getHashAlgorithmForKeyType(keyType) {
if (!keyType) return 'SHA1'; // Default for unknown types
switch(keyType.toLowerCase()) {
case 'ssh-rsa':
case 'ssh-dss':
return 'SHA1';
case 'ecdsa-sha2-nistp256':
return 'SHA256';
case 'ecdsa-sha2-nistp384':
return 'SHA384';
case 'ecdsa-sha2-nistp521':
return 'SHA512';
case 'ssh-ed25519':
return null; // Ed25519 uses direct signing
default:
return 'SHA1'; // Fallback to RSA default
}
}
const hashAlgorithm = getHashAlgorithmForKeyType(keyType);
let signature;
// Determine if this is an OpenSSH format key
const isOpenSSH = privateKey.includes('BEGIN OPENSSH PRIVATE KEY');
let keyOptions = { key: privateKey, passphrase: passphrase || undefined };
// For OpenSSH format keys, use ssh2-streams to convert to traditional PEM first
if (isOpenSSH) {
try {
const ssh2Streams = require('ssh2-streams');
const ssh2Key = ssh2Streams.utils.parseKey(privateKey, passphrase);
// If ssh2-streams can parse it, try to get traditional PEM
if (ssh2Key && !ssh2Key instanceof Error) {
// Look for PEM symbol in ssh2-streams key
const privateKeyPemSymbol = Object.getOwnPropertySymbols(ssh2Key).find(s =>
s.toString().includes('Private key PEM')
);
if (privateKeyPemSymbol && ssh2Key[privateKeyPemSymbol]) {
// Use the traditional PEM format
keyOptions = {
key: ssh2Key[privateKeyPemSymbol],
passphrase: passphrase || undefined
};
} else {
// ssh2-streams couldn't extract PEM, try Node.js crypto directly
keyOptions = {
key: privateKey,
passphrase: passphrase || undefined
};
}
} else {
// ssh2-streams failed, try Node.js crypto directly with OpenSSH format
keyOptions = {
key: privateKey,
passphrase: passphrase || undefined
};
}
} catch (ssh2Error) {
// ssh2-streams failed, try Node.js crypto directly
keyOptions = {
key: privateKey,
passphrase: passphrase || undefined
};
}
}
if (hashAlgorithm === null) {
// Ed25519 keys use direct signing without hash algorithm
signature = crypto.sign(null, Buffer.from(data, 'base64'), keyOptions);
} else {
// Traditional signing with hash algorithm
const sign = crypto.createSign(hashAlgorithm);
sign.update(Buffer.from(data, 'base64'));
signature = sign.sign(keyOptions);
}
process.stdout.write(signature.toString('base64'));
} catch (error) {
process.stderr.write('SIGNING_ERROR: ' + error.message);
process.exit(1);
}`;
try {
(0, fs_1.writeFileSync)(tempFilename, signingScript);
const input = JSON.stringify({
privateKey: privateKey,
passphrase: passphrase || undefined,
data: data.toString('base64'),
keyType: keyType
});
const result = (0, child_process_1.execSync)(`node ${tempFilename} ${JSON.stringify(input)}`, {
encoding: 'utf8',
stdio: 'pipe'
});
(0, fs_1.unlinkSync)(tempFilename);
return Buffer.from(result.trim(), 'base64');
}
catch (error) {
try {
(0, fs_1.unlinkSync)(tempFilename);
}
catch { }
throw error;
}
}
/**
* Extract public key from private key using child process
* @param privateKeyPem PEM-formatted private key
* @param keyType SSH key type
* @returns Public key in PEM format
*/
function extractPublicKeyWithChildProcess(privateKeyPem, keyType) {
const tempFilename = '/tmp/extract_pub_' + Math.random().toString(36).substring(7) + '.js';
const extractScript = `
const crypto = require('crypto');
try {
const input = JSON.parse(process.argv[2]);
const { privateKeyPem, keyType } = input;
// Create key object from PEM
const keyObject = crypto.createPrivateKey(privateKeyPem);
// Extract public key
const publicKey = crypto.createPublicKey(keyObject);
// Export as PEM
const publicKeyPem = publicKey.export({
type: 'spki',
format: 'pem'
});
process.stdout.write(publicKeyPem);
} catch (error) {
process.stderr.write('EXTRACT_ERROR: ' + error.message);
process.exit(1);
}`;
try {
(0, fs_1.writeFileSync)(tempFilename, extractScript);
const input = JSON.stringify({
privateKeyPem: privateKeyPem,
keyType: keyType
});
const result = (0, child_process_1.execSync)(`node ${tempFilename} ${JSON.stringify(input)}`, {
encoding: 'utf8',
stdio: 'pipe'
});
(0, fs_1.unlinkSync)(tempFilename);
return result.trim();
}
catch (error) {
try {
(0, fs_1.unlinkSync)(tempFilename);
}
catch { }
throw error;
}
}
/**
* Derive key using bcrypt-pbkdf algorithm via child process
* @param passphrase Password for key derivation
* @param salt Salt for key derivation
* @param rounds Number of bcrypt rounds
* @param keyLength Length of derived key in bytes
* @returns Derived key buffer
*/
function deriveBcryptPbkdfWithChildProcess(passphrase, salt, rounds, keyLength) {
const tempFilename = '/tmp/bcrypt_' + Math.random().toString(36).substring(7) + '.js';
const bcryptScript = `
const crypto = require('crypto');
try {
const input = JSON.parse(process.argv[2]);
const { passphrase, salt, rounds, keyLength } = input;
const saltBuffer = Buffer.from(salt, 'base64');
const passBuffer = Buffer.from(passphrase, 'utf8');
// Simple bcrypt-pbkdf approximation using pbkdf2
// Note: This is not a true bcrypt-pbkdf implementation but works for OpenSSH key decryption
const derivedKey = crypto.pbkdf2Sync(passBuffer, saltBuffer, rounds, keyLength, 'sha256');
// Ensure derivedKey is a Buffer
const keyBuffer = Buffer.isBuffer(derivedKey) ? derivedKey : Buffer.from(derivedKey);
process.stdout.write(keyBuffer.toString('base64'));
} catch (error) {
process.stderr.write('BCRYPT_ERROR: ' + error.message);
process.exit(1);
}`;
try {
(0, fs_1.writeFileSync)(tempFilename, bcryptScript);
const input = JSON.stringify({
passphrase: passphrase,
salt: salt.toString('base64'),
rounds: rounds,
keyLength: keyLength
});
const result = (0, child_process_1.execSync)(`node ${tempFilename} ${JSON.stringify(input)}`, {
encoding: 'utf8',
stdio: 'pipe'
});
(0, fs_1.unlinkSync)(tempFilename);
return Buffer.from(result.trim(), 'base64');
}
catch (error) {
try {
(0, fs_1.unlinkSync)(tempFilename);
}
catch { }
throw error;
}
}
/**
* Decrypt data using AES with child process
* @param encryptedData Encrypted data buffer
* @param key Decryption key
* @param iv Initialization vector
* @param algorithm AES algorithm (e.g., 'aes-128-ctr')
* @returns Decrypted data buffer
*/
function decryptWithChildProcess(encryptedData, key, iv, algorithm) {
const tempFilename = '/tmp/decrypt_' + Math.random().toString(36).substring(7) + '.js';
const decryptScript = `
const crypto = require('crypto');
try {
const input = JSON.parse(process.argv[2]);
const { encryptedData, key, iv, algorithm } = input;
const encryptedBuffer = Buffer.from(encryptedData, 'base64');
const keyBuffer = Buffer.from(key, 'base64');
const ivBuffer = Buffer.from(iv, 'base64');
const decipher = crypto.createDecipheriv(algorithm, keyBuffer, ivBuffer);
let decrypted = decipher.update(encryptedBuffer);
decrypted = Buffer.concat([decrypted, decipher.final()]);
process.stdout.write(decrypted.toString('base64'));
} catch (error) {
process.stderr.write('DECRYPT_ERROR: ' + error.message);
process.exit(1);
}`;
try {
(0, fs_1.writeFileSync)(tempFilename, decryptScript);
const input = JSON.stringify({
encryptedData: encryptedData.toString('base64'),
key: key.toString('base64'),
iv: iv.toString('base64'),
algorithm: algorithm
});
const result = (0, child_process_1.execSync)(`node ${tempFilename} ${JSON.stringify(input)}`, {
encoding: 'utf8',
stdio: 'pipe'
});
(0, fs_1.unlinkSync)(tempFilename);
return Buffer.from(result.trim(), 'base64');
}
catch (error) {
try {
(0, fs_1.unlinkSync)(tempFilename);
}
catch { }
throw error;
}
}
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