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authoralecpl <alec@alec.pl>2009-05-16 13:01:49 +0000
committeralecpl <alec@alec.pl>2009-05-16 13:01:49 +0000
commit2471d3a979d00e0cecca64e0d5889ca40c02c5fe (patch)
tree80a707b81bfba636d004107f5c04a59a3a0eebf7 /program/include/rcmail.php
parent34ee9e7498f84394bfc7d5a4a845720aed8e0b2f (diff)
- Added possibility to encrypt received header, option 'http_received_header_encrypt',
added some more logic in encrypt/decrypt functions for security
Diffstat (limited to 'program/include/rcmail.php')
-rw-r--r--program/include/rcmail.php107
1 files changed, 73 insertions, 34 deletions
diff --git a/program/include/rcmail.php b/program/include/rcmail.php
index 06f50a13f..ec0a6f445 100644
--- a/program/include/rcmail.php
+++ b/program/include/rcmail.php
@@ -392,7 +392,7 @@ class rcmail
$conn = false;
if ($_SESSION['imap_host'] && !$this->imap->conn) {
- if (!($conn = $this->imap->connect($_SESSION['imap_host'], $_SESSION['username'], $this->decrypt_passwd($_SESSION['password']), $_SESSION['imap_port'], $_SESSION['imap_ssl']))) {
+ if (!($conn = $this->imap->connect($_SESSION['imap_host'], $_SESSION['username'], $this->decrypt($_SESSION['password']), $_SESSION['imap_port'], $_SESSION['imap_ssl']))) {
if ($this->output)
$this->output->show_message($this->imap->error_code == -1 ? 'imaperror' : 'sessionerror', 'error');
}
@@ -518,7 +518,7 @@ class rcmail
$_SESSION['imap_host'] = $host;
$_SESSION['imap_port'] = $imap_port;
$_SESSION['imap_ssl'] = $imap_ssl;
- $_SESSION['password'] = $this->encrypt_passwd($pass);
+ $_SESSION['password'] = $this->encrypt($pass);
$_SESSION['login_time'] = mktime();
if ($_REQUEST['_timezone'] != '_default_')
@@ -873,65 +873,104 @@ class rcmail
return md5($auth_string);
}
+
/**
- * Encrypt IMAP password using DES encryption
+ * Encrypt using 3DES
+ *
+ * @param string $clear clear text input
+ * @param string $key encryption key to retrieve from the configuration, defaults to 'des_key'
+ * @param boolean $base64 whether or not to base64_encode() the result before returning
*
- * @param string Password to encrypt
- * @return string Encryprted string
+ * @return string encrypted text
*/
- public function encrypt_passwd($pass)
+ public function encrypt($clear, $key = 'des_key', $base64 = true)
{
- if (function_exists('mcrypt_module_open') && ($td = mcrypt_module_open(MCRYPT_TripleDES, "", MCRYPT_MODE_ECB, ""))) {
+ /*-
+ * Add a single canary byte to the end of the clear text, which
+ * will help find out how much of padding will need to be removed
+ * upon decryption; see http://php.net/mcrypt_generic#68082
+ */
+ $clear = pack("a*H2", $clear, "80");
+
+ if (function_exists('mcrypt_module_open') &&
+ ($td = mcrypt_module_open(MCRYPT_TripleDES, "", MCRYPT_MODE_CBC, "")))
+ {
$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
- mcrypt_generic_init($td, $this->config->get_des_key(), $iv);
- $cypher = mcrypt_generic($td, $pass);
+ mcrypt_generic_init($td, $this->config->get_crypto_key($key), $iv);
+ $cipher = $iv . mcrypt_generic($td, $clear);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
}
- else if (function_exists('des')) {
- $cypher = des($this->config->get_des_key(), $pass, 1, 0, NULL);
+ else if (function_exists('des'))
+ {
+ define('DES_IV_SIZE', 8);
+ $iv = '';
+ for ($i = 0; $i < constant('DES_IV_SIZE'); $i++)
+ $iv .= sprintf("%c", mt_rand(0, 255));
+ $cipher = $iv . des($this->config->get_crypto_key($key), $clear, 1, 1, $iv);
}
- else {
- $cypher = $pass;
-
+ else
+ {
raise_error(array(
'code' => 500,
'type' => 'php',
'file' => __FILE__,
- 'message' => "Could not convert encrypt password. Make sure Mcrypt is installed or lib/des.inc is available"
- ), true, false);
+ 'message' => "Could not perform encryption; make sure Mcrypt is installed or lib/des.inc is available"
+ ), true, true);
}
-
- return base64_encode($cypher);
+
+ return $base64 ? base64_encode($cipher) : $cipher;
}
-
/**
- * Decrypt IMAP password using DES encryption
+ * Decrypt 3DES-encrypted string
+ *
+ * @param string $cipher encrypted text
+ * @param string $key encryption key to retrieve from the configuration, defaults to 'des_key'
+ * @param boolean $base64 whether or not input is base64-encoded
*
- * @param string Encrypted password
- * @return string Plain password
+ * @return string decrypted text
*/
- public function decrypt_passwd($cypher)
+ public function decrypt($cipher, $key = 'des_key', $base64 = true)
{
- if (function_exists('mcrypt_module_open') && ($td = mcrypt_module_open(MCRYPT_TripleDES, "", MCRYPT_MODE_ECB, ""))) {
- $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
- mcrypt_generic_init($td, $this->config->get_des_key(), $iv);
- $pass = mdecrypt_generic($td, base64_decode($cypher));
+ $cipher = $base64 ? base64_decode($cipher) : $cipher;
+
+ if (function_exists('mcrypt_module_open') &&
+ ($td = mcrypt_module_open(MCRYPT_TripleDES, "", MCRYPT_MODE_CBC, "")))
+ {
+ $iv = substr($cipher, 0, mcrypt_enc_get_iv_size($td));
+ $cipher = substr($cipher, mcrypt_enc_get_iv_size($td));
+ mcrypt_generic_init($td, $this->config->get_crypto_key($key), $iv);
+ $clear = mdecrypt_generic($td, $cipher);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
}
- else if (function_exists('des')) {
- $pass = des($this->config->get_des_key(), base64_decode($cypher), 0, 0, NULL);
+ else if (function_exists('des'))
+ {
+ define('DES_IV_SIZE', 8);
+ $iv = substr($cipher, 0, constant('DES_IV_SIZE'));
+ $cipher = substr($cipher, constant('DES_IV_SIZE'));
+ $clear = des($this->config->get_crypto_key($key), $cipher, 0, 1, $iv);
}
- else {
- $pass = base64_decode($cypher);
+ else
+ {
+ raise_error(array(
+ 'code' => 500,
+ 'type' => 'php',
+ 'file' => __FILE__,
+ 'message' => "Could not perform decryption; make sure Mcrypt is installed or lib/des.inc is available"
+ ), true, true);
}
-
- return preg_replace('/\x00/', '', $pass);
+
+ /*-
+ * Trim PHP's padding and the canary byte; see note in
+ * rcmail::encrypt() and http://php.net/mcrypt_generic#68082
+ */
+ $clear = substr(rtrim($clear, "\0"), 0, -1);
+
+ return $clear;
}
-
/**
* Build a valid URL to this instance of RoundCube
*