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authorplegall <plg@piwigo.org>2012-11-02 13:59:07 +0000
committerplegall <plg@piwigo.org>2012-11-02 13:59:07 +0000
commita73846717f5c884e0eef0b5591ff7ad374375a0b (patch)
treea8e52d992545558cbacacf50e704a332a80c9810 /include/passwordhash.class.php
parent805ce4bb02c9e3114c76841db75c23a59d17a3c4 (diff)
feature 2727: improve password security with the use of PasswordHash class.
This class performs salt and multiple iterations. Already used in Wordpress, Drupal, phpBB and many other web applications. $conf['pass_convert'] is replaced by $conf['password_hash'] + $conf['password_verify'] git-svn-id: http://piwigo.org/svn/trunk@18889 68402e56-0260-453c-a942-63ccdbb3a9ee
Diffstat (limited to '')
-rw-r--r--include/passwordhash.class.php253
1 files changed, 253 insertions, 0 deletions
diff --git a/include/passwordhash.class.php b/include/passwordhash.class.php
new file mode 100644
index 000000000..12958c7f1
--- /dev/null
+++ b/include/passwordhash.class.php
@@ -0,0 +1,253 @@
+<?php
+#
+# Portable PHP password hashing framework.
+#
+# Version 0.3 / genuine.
+#
+# Written by Solar Designer <solar at openwall.com> in 2004-2006 and placed in
+# the public domain. Revised in subsequent years, still public domain.
+#
+# There's absolutely no warranty.
+#
+# The homepage URL for this framework is:
+#
+# http://www.openwall.com/phpass/
+#
+# Please be sure to update the Version line if you edit this file in any way.
+# It is suggested that you leave the main version number intact, but indicate
+# your project name (after the slash) and add your own revision information.
+#
+# Please do not change the "private" password hashing method implemented in
+# here, thereby making your hashes incompatible. However, if you must, please
+# change the hash type identifier (the "$P$") to something different.
+#
+# Obviously, since this code is in the public domain, the above are not
+# requirements (there can be none), but merely suggestions.
+#
+class PasswordHash {
+ var $itoa64;
+ var $iteration_count_log2;
+ var $portable_hashes;
+ var $random_state;
+
+ function PasswordHash($iteration_count_log2, $portable_hashes)
+ {
+ $this->itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
+
+ if ($iteration_count_log2 < 4 || $iteration_count_log2 > 31)
+ $iteration_count_log2 = 8;
+ $this->iteration_count_log2 = $iteration_count_log2;
+
+ $this->portable_hashes = $portable_hashes;
+
+ $this->random_state = microtime();
+ if (function_exists('getmypid'))
+ $this->random_state .= getmypid();
+ }
+
+ function get_random_bytes($count)
+ {
+ $output = '';
+ if (is_readable('/dev/urandom') &&
+ ($fh = @fopen('/dev/urandom', 'rb'))) {
+ $output = fread($fh, $count);
+ fclose($fh);
+ }
+
+ if (strlen($output) < $count) {
+ $output = '';
+ for ($i = 0; $i < $count; $i += 16) {
+ $this->random_state =
+ md5(microtime() . $this->random_state);
+ $output .=
+ pack('H*', md5($this->random_state));
+ }
+ $output = substr($output, 0, $count);
+ }
+
+ return $output;
+ }
+
+ function encode64($input, $count)
+ {
+ $output = '';
+ $i = 0;
+ do {
+ $value = ord($input[$i++]);
+ $output .= $this->itoa64[$value & 0x3f];
+ if ($i < $count)
+ $value |= ord($input[$i]) << 8;
+ $output .= $this->itoa64[($value >> 6) & 0x3f];
+ if ($i++ >= $count)
+ break;
+ if ($i < $count)
+ $value |= ord($input[$i]) << 16;
+ $output .= $this->itoa64[($value >> 12) & 0x3f];
+ if ($i++ >= $count)
+ break;
+ $output .= $this->itoa64[($value >> 18) & 0x3f];
+ } while ($i < $count);
+
+ return $output;
+ }
+
+ function gensalt_private($input)
+ {
+ $output = '$P$';
+ $output .= $this->itoa64[min($this->iteration_count_log2 +
+ ((PHP_VERSION >= '5') ? 5 : 3), 30)];
+ $output .= $this->encode64($input, 6);
+
+ return $output;
+ }
+
+ function crypt_private($password, $setting)
+ {
+ $output = '*0';
+ if (substr($setting, 0, 2) == $output)
+ $output = '*1';
+
+ $id = substr($setting, 0, 3);
+ # We use "$P$", phpBB3 uses "$H$" for the same thing
+ if ($id != '$P$' && $id != '$H$')
+ return $output;
+
+ $count_log2 = strpos($this->itoa64, $setting[3]);
+ if ($count_log2 < 7 || $count_log2 > 30)
+ return $output;
+
+ $count = 1 << $count_log2;
+
+ $salt = substr($setting, 4, 8);
+ if (strlen($salt) != 8)
+ return $output;
+
+ # 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).
+ if (PHP_VERSION >= '5') {
+ $hash = md5($salt . $password, TRUE);
+ do {
+ $hash = md5($hash . $password, TRUE);
+ } while (--$count);
+ } else {
+ $hash = pack('H*', md5($salt . $password));
+ do {
+ $hash = pack('H*', md5($hash . $password));
+ } while (--$count);
+ }
+
+ $output = substr($setting, 0, 12);
+ $output .= $this->encode64($hash, 16);
+
+ return $output;
+ }
+
+ function gensalt_extended($input)
+ {
+ $count_log2 = min($this->iteration_count_log2 + 8, 24);
+ # This should be odd to not reveal weak DES keys, and the
+ # maximum valid value is (2**24 - 1) which is odd anyway.
+ $count = (1 << $count_log2) - 1;
+
+ $output = '_';
+ $output .= $this->itoa64[$count & 0x3f];
+ $output .= $this->itoa64[($count >> 6) & 0x3f];
+ $output .= $this->itoa64[($count >> 12) & 0x3f];
+ $output .= $this->itoa64[($count >> 18) & 0x3f];
+
+ $output .= $this->encode64($input, 3);
+
+ return $output;
+ }
+
+ function gensalt_blowfish($input)
+ {
+ # This one needs to use a different order of characters and a
+ # different encoding scheme from the one in encode64() above.
+ # We care because the last character in our encoded string will
+ # only represent 2 bits. While two known implementations of
+ # bcrypt will happily accept and correct a salt string which
+ # has the 4 unused bits set to non-zero, we do not want to take
+ # chances and we also do not want to waste an additional byte
+ # of entropy.
+ $itoa64 = './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
+
+ $output = '$2a$';
+ $output .= chr(ord('0') + $this->iteration_count_log2 / 10);
+ $output .= chr(ord('0') + $this->iteration_count_log2 % 10);
+ $output .= '$';
+
+ $i = 0;
+ do {
+ $c1 = ord($input[$i++]);
+ $output .= $itoa64[$c1 >> 2];
+ $c1 = ($c1 & 0x03) << 4;
+ if ($i >= 16) {
+ $output .= $itoa64[$c1];
+ break;
+ }
+
+ $c2 = ord($input[$i++]);
+ $c1 |= $c2 >> 4;
+ $output .= $itoa64[$c1];
+ $c1 = ($c2 & 0x0f) << 2;
+
+ $c2 = ord($input[$i++]);
+ $c1 |= $c2 >> 6;
+ $output .= $itoa64[$c1];
+ $output .= $itoa64[$c2 & 0x3f];
+ } while (1);
+
+ return $output;
+ }
+
+ function HashPassword($password)
+ {
+ $random = '';
+
+ if (CRYPT_BLOWFISH == 1 && !$this->portable_hashes) {
+ $random = $this->get_random_bytes(16);
+ $hash =
+ crypt($password, $this->gensalt_blowfish($random));
+ if (strlen($hash) == 60)
+ return $hash;
+ }
+
+ if (CRYPT_EXT_DES == 1 && !$this->portable_hashes) {
+ if (strlen($random) < 3)
+ $random = $this->get_random_bytes(3);
+ $hash =
+ crypt($password, $this->gensalt_extended($random));
+ if (strlen($hash) == 20)
+ return $hash;
+ }
+
+ if (strlen($random) < 6)
+ $random = $this->get_random_bytes(6);
+ $hash =
+ $this->crypt_private($password,
+ $this->gensalt_private($random));
+ if (strlen($hash) == 34)
+ return $hash;
+
+ # Returning '*' on error is safe here, but would _not_ be safe
+ # in a crypt(3)-like function used _both_ for generating new
+ # hashes and for validating passwords against existing hashes.
+ return '*';
+ }
+
+ function CheckPassword($password, $stored_hash)
+ {
+ $hash = $this->crypt_private($password, $stored_hash);
+ if ($hash[0] == '*')
+ $hash = crypt($password, $stored_hash);
+
+ return $hash == $stored_hash;
+ }
+}
+
+?>