Index: includes/passwordhash.inc
===================================================================
RCS file: includes/passwordhash.inc
diff -N includes/passwordhash.inc
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ includes/passwordhash.inc	26 Feb 2008 13:22:36 -0000
@@ -0,0 +1,226 @@
+<?php
+// $Id$
+
+/**
+ * @file
+ * Secure password hashing functions for user authentication.
+ *
+ * Based on the Portable PHP password hashing framework, Version 0.1.
+ * @see http://www.openwall.com/phpass/
+ */
+
+/**
+ * The standard log2 number of iterations for password stretching. This should
+ * probably be increased by 1 at least every other Drupal version.
+ */
+define('DRUPAL_HASH_ITERATION', 9);
+
+/**
+ * Returns a string for mapping an int to the corresponding base 64 character.
+ */ 
+function _passwordhash_itoa64() {
+  return './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
+}
+
+/**
+ * Returns a string of highly randomized bytes (over the full 8-bit range)
+ * 
+ * @param $count
+ *   The number of characters (bytes) to return in the string.
+ */
+function _passwordhash_random_bytes($count)  {
+  static $random_state;
+
+  if (empty($random_state)) {
+    $random_state = getmypid();
+  }
+
+  $output = '';
+  if ($fh = @fopen('/dev/urandom', 'rb')) {
+    $output = fread($fh, $count);
+    fclose($fh);
+  }
+
+  while (strlen($output) < $count) {
+    $random_state = md5(microtime() . mt_rand() . $random_state);
+    $output .= md5(mt_rand() . $random_state, TRUE);
+  }
+  return substr($output, 0, $count);
+}
+
+/**
+ * Encodes bytes into printable base 64, up to a set number of bytes.
+ * 
+ * @param $input
+ *   The string containing bytes to encode.
+ * @param $count
+ *   The number of characters (bytes) to encode.
+ *
+ * @return
+ *   Encoded string 
+ */
+function  _passwordhash_encode64($input, $count)  {
+  $output = '';
+  $i = 0;
+  $itoa64 = _passwordhash_itoa64();
+  do {
+    $value = ord($input[$i++]);
+    $output .= $itoa64[$value & 0x3f];
+    if ($i < $count) {
+      $value |= ord($input[$i]) << 8;
+    }
+    $output .= $itoa64[($value >> 6) & 0x3f];
+    if ($i++ >= $count) {
+      break;
+    }
+    if ($i < $count) {
+      $value |= ord($input[$i]) << 16;
+    }
+    $output .= $itoa64[($value >> 12) & 0x3f];
+    if ($i++ >= $count) {
+      break;
+    }
+    $output .= $itoa64[($value >> 18) & 0x3f];
+  } while ($i < $count);
+
+  return $output;
+}
+
+/**
+ * Generates a random base 64 encoded salt prefixed with settings for the hash.
+ *
+ * @param $iteration_count_log2
+ *   This affects the number of iterations used in the hashing process.
+ *   A larger value is more secure, but takes more time to complete.
+ */
+function _passwordhash_gensalt_private($iteration_count_log2) {
+  $itoa64 = _passwordhash_itoa64();
+  // For compatibility with the phpass framework, increase the nominal count
+  // by 5 for PHP 5 and portable hashes. This makes it comparable to bcrypt.
+  $iteration_count_log2 += 5;
+  // Minimum log2 iterations is 7.
+  $iteration_count_log2 = max($iteration_count_log2, 7);
+  $output = '$P$';
+  // Maximum log2 iterations is 30.
+  $output .= $itoa64[min($iteration_count_log2, 30)];
+  $output .= _passwordhash_encode64(_passwordhash_random_bytes(6), 6);
+
+  return $output;
+}
+
+/**
+ * Hash a password using a secure portable hash.
+ *
+ * @param $password
+ *   The password to hash
+ * @param $setting
+ *   An existing hash or the output of _passwordhash_gensalt_private()
+ *
+ * @return
+ *   The hashed password or FALSE on failure.
+ */
+function _passwordhash_crypt_private($password, $setting)  {
+
+  if (substr($setting, 0, 3) != '$P$') {
+    return FALSE;
+  }
+  $itoa64 = _passwordhash_itoa64();
+  $count_log2 = strpos($itoa64, $setting[3]);
+  // Portable hashes may come from elsewhere, so we allow < DRUPAL_HASH_ITERATION
+  if ($count_log2 < 7 || $count_log2 > 30) {
+    return FALSE;
+  }
+
+  $salt = substr($setting, 4, 8);
+  if (strlen($salt) != 8) {
+    return FALSE;
+  }
+
+  // We're kind of forced to use MD5 here since it's the only
+  // cryptographic primitive available in all versions of PHP
+  // currently in use.  To implement our own low-level crypto
+  // in PHP would result in much worse performance and
+  // consequently in lower iteration counts and hashes that are
+  // quicker to crack (by non-PHP code).
+
+  $count = 1 << $count_log2;
+
+  $hash = md5($salt . $password, TRUE);
+  do {
+    $hash = md5($hash . $password, TRUE);
+  } while (--$count);
+
+  $output = substr($setting, 0, 12);
+  $output .= _passwordhash_encode64($hash, 16);
+
+  return (strlen($output) == 34) ? $output : FALSE;
+}
+
+function _passwordhash_get_count_log2($stored_hash) {
+  $itoa64 = _passwordhash_itoa64();
+  // Subtract 5 to get the bcrypt equivalent number.
+  return strpos($itoa64, $stored_hash[3]) - 5;
+}
+
+/**
+ * Hash a password using a secure hash.
+ *
+ * @param $password
+ *   A plain-text password
+ * @param $iteration_count_log2
+ *   Optional. Specifies the iteration count. Generally used only during mass
+ *   operations where a value different than the default is neeeded for speed. 
+ *
+ * @return
+ *   A string containing the hashed password (and a salt), or FALSE on failure.
+ */
+function user_hash_password($password, $iteration_count_log2 = NULL) {
+  if (empty($iteration_count_log2)) {
+    $iteration_count_log2 = variable_get('passwordhash_count_log2', DRUPAL_HASH_ITERATION);
+  }
+  return _passwordhash_crypt_private($password, _passwordhash_gensalt_private($iteration_count_log2));
+}
+
+/**
+ * Check whether a plain text password matches a stored hashed password.
+ *
+ * @param $password
+ *   A plain-text password
+ * @param $account
+ *   A user object with at least the fields from the {users} table.
+ *
+ * @return
+ *   TRUE or FALSE.
+ */
+function user_check_password($password, $account) {
+  if (substr($account->pass, 0, 4) == 'U$P$') {
+    // This may be an updated password from system_update_7001(). Such hashes 
+    // have 'U' added as the first character and need an extra md5().
+    $stored_hash = substr($account->pass, 1);
+    $password = md5($password);
+  }
+  else {
+    $stored_hash = $account->pass;
+  }
+  $hash = _passwordhash_crypt_private($password, $stored_hash);
+  return ($hash && $stored_hash == $hash);
+}
+
+/**
+ * Check whether a user's hashed password needs to be replaced with a new hash.
+ *
+ * @param $account
+ *   A user object with at least the fields from the {users} table.
+ *
+ * @return
+ *   TRUE or FALSE.
+ */
+function user_needs_new_hash($account) {
+  // Check whether this was an updated password.
+  if (strlen($account->pass) != 34 || (substr($account->pass, 0, 3) != '$P$')) {
+    return TRUE;
+  }
+  // Check whether the iteration count used differs from the standard number.
+  return (_passwordhash_get_count_log2($account->pass) != variable_get('passwordhash_count_log2', DRUPAL_HASH_ITERATION));
+}
+
Index: modules/system/system.install
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.install,v
retrieving revision 1.240
diff -u -p -r1.240 system.install
--- modules/system/system.install	23 Feb 2008 08:13:09 -0000	1.240
+++ modules/system/system.install	26 Feb 2008 13:22:36 -0000
@@ -2549,6 +2549,48 @@ function system_update_7000() {
 }
 
 /**
+ * Increase the length of the password field to accomodate better hashes.
+ *
+ * Also re-hashes all current passwords to improve security. This will take a
+ * while to run.
+ */
+function system_update_7001(&$sandbox) {
+  $ret = array('#finished' => 0);
+  // A lower number than DRUPAL_HASH_ITERATION to make the update run at a reasonable speed
+  $drupal_new_hash_iteration = 6;
+  // Multi-part update
+  if (!isset($sandbox['user_from'])) {
+    db_change_field($ret, 'users', 'pass', 'pass', array('type' => 'varchar', 'length' => 128, 'not null' => TRUE, 'default' => ''));
+    $sandbox['user_from'] = 0;
+    $sandbox['user_count'] = db_result(db_query("SELECT COUNT(uid) FROM {users}"));
+  }
+  else {
+    require_once variable_get('passwordhash_inc', './includes/passwordhash.inc');
+    //  Hash again all current hashed passwords
+    $has_rows = FALSE;
+    // Update this many per page load.
+    $count = 1000;
+    $result = db_query_range("SELECT uid, pass FROM {users} WHERE uid > 0 ORDER BY uid", $sandbox['user_from'], $count);
+    while ($account = db_fetch_array($result)) {
+       $has_rows = TRUE;
+       $new_hash = user_hash_password($account['pass'], $drupal_new_hash_iteration);
+       if ($new_hash) {
+         // Indicate an updated password.
+         $new_hash  = 'U'. $new_hash;
+         db_query("UPDATE {users} SET pass = '%s' WHERE uid = %d", $new_hash, $account['uid']);
+       }
+    }
+    $ret['#finished'] = $sandbox['user_from']/$sandbox['user_count'];
+    $sandbox['user_from'] += $count;
+    if (!$has_rows) {
+      $ret['#finished'] = 1;
+      $ret[] = array('success' => TRUE, 'query' => "UPDATE {users} SET pass = 'U'. user_hash_password(pass) WHERE uid > 0");
+    }
+  }
+  return $ret;
+}
+
+/**
  * @} End of "defgroup updates-6.x-to-7.x"
  * The next series of updates should start at 8000.
  */
Index: modules/user/user.install
===================================================================
RCS file: /cvs/drupal/drupal/modules/user/user.install,v
retrieving revision 1.6
diff -u -p -r1.6 user.install
--- modules/user/user.install	18 Feb 2008 16:53:36 -0000	1.6
+++ modules/user/user.install	26 Feb 2008 13:22:36 -0000
@@ -144,10 +144,10 @@ function user_schema() {
       ),
       'pass' => array(
         'type' => 'varchar',
-        'length' => 32,
+        'length' => 128,
         'not null' => TRUE,
         'default' => '',
-        'description' => t("User's password (md5 hash)."),
+        'description' => t("User's password (hashed)."),
       ),
       'mail' => array(
         'type' => 'varchar',
Index: modules/user/user.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/user/user.module,v
retrieving revision 1.896
diff -u -p -r1.896 user.module
--- modules/user/user.module	20 Feb 2008 13:46:43 -0000	1.896
+++ modules/user/user.module	26 Feb 2008 13:22:37 -0000
@@ -157,7 +157,7 @@ function user_load($array = array()) {
     }
     else if ($key == 'pass') {
       $query[] = "pass = '%s'";
-      $params[] = md5($value);
+      $params[] = $value;
     }
     else {
       $query[]= "LOWER($key) = LOWER('%s')";
@@ -214,7 +214,9 @@ function user_save($account, $array = ar
   $user_fields = $table['fields'];
 
   if (!empty($array['pass'])) {
-    $array['pass'] = md5($array['pass']);
+    // Allow alternate hashing schemes.
+    require_once variable_get('passwordhash_inc', './includes/passwordhash.inc');
+    $array['pass'] = user_hash_password(trim($array['pass']));
   }
   else {
     // Avoid overwriting an existing password with a blank password.
@@ -1283,12 +1285,26 @@ function user_login_final_validate($form
 function user_authenticate($form_values = array()) {
   global $user;
 
+  $password = trim($form_values['pass']);
   // Name and pass keys are required.
-  if (!empty($form_values['name']) && !empty($form_values['pass']) &&
-      $account = user_load(array('name' => $form_values['name'], 'pass' => trim($form_values['pass']), 'status' => 1))) {
-    $user = $account;
-    user_authenticate_finalize($form_values);
-    return $user;
+  if (!empty($form_values['name']) && !empty($password)) {
+    $account = db_fetch_object(db_query("SELECT * FROM {users} WHERE name = '%s' AND status = 1", $form_values['name']));
+    if ($account) {
+      // Allow alternate hashing schemes.
+      require_once variable_get('passwordhash_inc', './includes/passwordhash.inc');
+      if (user_check_password($password, $account)) {
+        if (user_needs_new_hash($account)) {
+           $new_hash = user_hash_password($password);
+           if ($new_hash) {
+             db_query("UPDATE {users} SET pass = '%s' WHERE uid = %d", $new_hash, $account->uid);
+           }
+        }
+        $account = user_load(array('uid' => $account->uid, 'status' => 1));
+        $user = $account;
+        user_authenticate_finalize($form_values);
+        return $user;
+      }
+    }
   }
 }