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his appendix shows the full source code listing for the password manager and password file classes used in 9. (Note that all of the source code used in the book is also available at www.learnsecurity.com/ntk.) In the listing that follows, we include code for two versions of a password file class. The HashedPasswordFile class stores passwords that are simply hashed using SHA-256. The HashedSaltedPasswordFile class stores a salted hash of the password. The init() and flush() methods in MiniPasswordManager can be modified to specify which version of the password file class should be used. Of course, the add() and checkPassword() methods need to be modified to match as well. Finally, please note that this code is meant for instructional purposes only (and can be exploited; see, for example, exercise 6 in 11); do not use this code as-is in a real system. /*********************************************************************** MiniPasswordManager.java Copyright (C) 2006 Neil Daswani This class implements a MiniPasswordManager that can be used by other applications. You must call init() prior to calling checkPassword(), or add(). This file is also available at http://www.learnsecurity.com/ntk ***********************************************************************/ package com.learnsecurity; import java.util.*; import java.io.*; import java.security.*; public class MiniPasswordManager { /** dUserMap is a Hashtable keyed by username, and has HashedPasswordTuples as its values */ private static Hashtable dUserMap;
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/** location of the password file on disk */ private static String dPwdFile; /** chooses a salt for the user, computes the salted hash of the user's password, and adds a new entry into the userMap hashtable for the user. */ public static void add(String username, String password) throws Exception { int salt = chooseNewSalt(); HashedPasswordTuple ur = new HashedPasswordTuple(getSaltedHash(password, salt), salt); dUserMap.put(username,ur); } /** computes a new, random 12-bit salt */ public static int chooseNewSalt() throws NoSuchAlgorithmException { return getSecureRandom((int)Math.pow(2,12)); } /** returns a cryptographically random number in the range [0,max) */ private static int getSecureRandom(int max) throws NoSuchAlgorithmException { SecureRandom sr = SecureRandom.getInstance("SHA1PRNG"); return Math.abs(sr.nextInt()); } /** returns a salted, SHA hash of the password */ public static String getSaltedHash(String pwd, int salt) throws Exception { return computeSHA(pwd + "|" + salt); } /** returns the SHA-256 hash of the provided preimage as a String */ private static String computeSHA(String preimage) throws Exception { MessageDigest md = null; md = MessageDigest.getInstance("SHA-256"); md.update(preimage.getBytes("UTF-8")); byte raw[] = md.digest(); return (new sun.misc.BASE64Encoder().encode(raw)); } /** returns true if the username and password combo is in the database */ public static boolean checkPassword(String username, String password) { try { HashedPasswordTuple t = (HashedPasswordTuple)dUserMap.get(username); return (t == null) false : t.getHashedPassword().equals(getSaltedHash(password, t.getSalt())); } catch (Exception e) {
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} return false; } /** Password file management operations follow **/ public static void init(String pwdFile) throws Exception { dUserMap = HashedSaltedPasswordFile.load(pwdFile); dPwdFile = pwdFile; } /** forces a write of the password file to disk */ public static void flush() throws Exception { HashedSaltedPasswordFile.store (dPwdFile, dUserMap); } /** adds a new username/password combination to the database, or replaces an existing one. */ public static void main(String argv[]) { String pwdFile = null; String userName = null; try { pwdFile = argv[0]; userName = argv[1]; init(pwdFile); System.out.print("Enter new password for " + userName + ": "); BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); String password = br.readLine(); add(userName, password); flush(); } catch (Exception e) { if ((pwdFile != null) && (userName != null)) { System.err.println("Error: Could not read or write " + pwdFile); } else { System.err.println("Usage: java " + "com.learnsecurity.MiniPasswordManager" + " <pwdfile> <username>"); } } } } /** This class is a simple container that stores a salt, and a salted, hashed password */ class HashedPasswordTuple { private String dHpwd; private int dSalt;
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public HashedPasswordTuple(String p, int s) { dHpwd = p; dSalt = s; } /** Constructs a HashedPasswordTuple pair from a line in the password file. */ public HashedPasswordTuple(String line) throws Exception { StringTokenizer st = new StringTokenizer(line, HashedSaltedPasswordFile.DELIMITER_STR); dHpwd = st.nextToken(); // hashed + salted password dSalt = Integer.parseInt(st.nextToken()); // salt } public String getHashedPassword() { return dHpwd; } public int getSalt() { return dSalt; } /** returns a HashedPasswordTuple in string format so that it can be written to the password file. */ public String toString () { return (dHpwd + HashedSaltedPasswordFile.DELIMITER_STR + (""+dSalt)); } } /** This class extends a HashedPasswordFile to support salted, hashed passwords. */ class HashedSaltedPasswordFile extends HashedPasswordFile { /* The load method overrides its parent's, as a salt also needs to be read from each line in the password file. */ public static Hashtable load(String pwdFile) { Hashtable userMap = new Hashtable(); try { FileReader fr = new FileReader(pwdFile); BufferedReader br = new BufferedReader(fr); String line; while ((line = br.readLine()) != null) { int delim = line.indexOf(DELIMITER_STR); String username = line.substring(0,delim); HashedPasswordTuple ur = new HashedPasswordTuple(line.substring(delim+1)); userMap.put(username, ur); } } catch (Exception e) {
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