595 lines
20 KiB
PHP
595 lines
20 KiB
PHP
<?php
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/**
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* auth.php
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*
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* Contains functions used to do authentication.
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*
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* Dependencies:
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* functions/global.php
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* functions/strings.php.
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*
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* @copyright 1999-2025 The SquirrelMail Project Team
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* @license http://opensource.org/licenses/gpl-license.php GNU Public License
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* @version $Id$
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* @package squirrelmail
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*/
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/**
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* Detect whether user is logged in
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*
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* Function is similar to is_logged_in() function. If user is logged in, function
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* returns true. If user is not logged in or session is expired, function saves $_POST
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* and PAGE_NAME in session and returns false. POST information is saved in
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* 'session_expired_post' variable, PAGE_NAME is saved in 'session_expired_location'.
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*
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* This function optionally checks the referrer of this page request. If the
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* administrator wants to impose a check that the referrer of this page request
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* is another page on the same domain (otherwise, the page request is likely
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* the result of a XSS or phishing attack), then they need to specify the
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* acceptable referrer domain in a variable named $check_referrer in
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* config/config.php (or the configuration tool) for which the value is
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* usually the same as the $domain setting (for example:
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* $check_referrer = 'example.com';
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* However, in some cases (where proxy servers are in use, etc.), the
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* acceptable referrer might be different. If $check_referrer is set to
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* "###DOMAIN###", then the current value of $domain is used (useful in
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* situations where $domain might change at runtime (when using the Login
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* Manager plugin to host multiple domains with one SquirrelMail installation,
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* for example)):
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* $check_referrer = '###DOMAIN###';
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* NOTE HOWEVER, that referrer checks are not foolproof - they can be spoofed
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* by browsers, and some browsers intentionally don't send them, in which
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* case SquirrelMail silently ignores referrer checks.
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*
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* Script that uses this function instead of is_logged_in() function, must handle user
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* level messages.
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* @return boolean
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* @since 1.5.1
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*/
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function sqauth_is_logged_in() {
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global $check_referrer, $domain;
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if (!sqgetGlobalVar('HTTP_REFERER', $referrer, SQ_SERVER)) $referrer = '';
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if ($check_referrer == '###DOMAIN###') $check_referrer = $domain;
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if (!empty($check_referrer)) {
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$ssl_check_referrer = 'https://' . $check_referrer;
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$plain_check_referrer = 'http://' . $check_referrer;
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}
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if (sqsession_is_registered('user_is_logged_in')
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&& (!$check_referrer || empty($referrer)
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|| ($check_referrer && !empty($referrer)
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&& (strpos(strtolower($referrer), strtolower($plain_check_referrer)) === 0
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|| strpos(strtolower($referrer), strtolower($ssl_check_referrer)) === 0)))) {
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return true;
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}
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// First we store some information in the new session to prevent
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// information-loss.
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$session_expired_post = $_POST;
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if (defined('PAGE_NAME'))
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$session_expired_location = PAGE_NAME;
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else
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$session_expired_location = '';
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if (!sqsession_is_registered('session_expired_post')) {
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sqsession_register($session_expired_post,'session_expired_post');
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}
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if (!sqsession_is_registered('session_expired_location')) {
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sqsession_register($session_expired_location,'session_expired_location');
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}
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session_write_close();
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return false;
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}
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/**
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* Reads and decodes stored user password information
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*
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* Direct access to password information is deprecated.
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* @return string password in plain text
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* @since 1.5.1
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*/
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function sqauth_read_password() {
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global $currentHookName;
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if ($currentHookName == 'login_verified') global $key;
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sqgetGlobalVar('key', $key, SQ_COOKIE);
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sqgetGlobalVar('onetimepad', $onetimepad,SQ_SESSION);
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return OneTimePadDecrypt($key, $onetimepad);
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}
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/**
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* Saves or updates user password information
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*
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* This function is used to update the password information that
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* SquirrelMail stores in the existing PHP session. It does NOT
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* modify the password stored in the authentication system used
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* by the IMAP server.
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*
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* This function must be called before any html output is started.
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* Direct access to password information is deprecated. The saved
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* password information is available only to the SquirrelMail script
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* that is called/executed AFTER the current one. If your script
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* needs access to the saved password after a sqauth_save_password()
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* call, use the returned OTP encrypted key.
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*
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* @param string $pass password
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*
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* @return string Password encrypted with OTP. In case the script
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* wants to access the password information before
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* the end of its execution.
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*
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* @since 1.5.1
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*
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*/
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function sqauth_save_password($pass) {
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sqgetGlobalVar('base_uri', $base_uri, SQ_SESSION);
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$onetimepad = OneTimePadCreate(strlen($pass));
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sqsession_register($onetimepad,'onetimepad');
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$key = OneTimePadEncrypt($pass, $onetimepad);
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sqsetcookie('key', $key, false, $base_uri);
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return $key;
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}
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/**
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* Determine if an algorithm is supported by hash() and hash_hmac()
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*
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* @param string $algo Algorithm to find.
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*
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* @return string Functional $algo as used by hash() and hash_hmac()
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* or boolean FALSE
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*
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* @since 1.5.2
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*/
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function scram_supports($algo) {
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$HASHs = hash_algos();
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if (check_php_version(7,2)) {
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$HMACs = hash_hmac_algos();
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$HASHs = array_values(array_intersect($HASHs, $HMACs));
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}
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$fAlgo = strtolower($algo);
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if (in_array($fAlgo, $HASHs))
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return $fAlgo;
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$fAlgo = str_replace('-', '', $fAlgo);
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if (in_array($fAlgo, $HASHs))
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return $fAlgo;
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return false;
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}
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/**
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* Build client nonce for SCRAM (See RFC 5802 for details)
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*
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* @return string A set of twenty random printable ASCII characters
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*
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* @since 1.5.2
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*/
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function scram_nonce () {
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// All printable ASCII characters except commas are OK
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// (For simplicity, we're just going to use letters and numbers, though)
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$chars = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
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$max = strlen($chars) - 1;
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$nonce = '';
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for($i = 0; $i < 20; $i++) {
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$rndChr = random_int(0, $max);
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$nonce.= $chars[$rndChr];
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}
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return $nonce;
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}
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/**
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* Build client request for SCRAM (See RFC 5802 for details)
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*
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* @param string $username User ID
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* @param string $cbf Channel Binding Flag ('n', 'y', or 'p=tls-unique'/'p=tls-server-end-point')
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* @param string $nonce Client's random nonce data
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*
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* @return string The response to be sent to the server (base64 encoded)
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*
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* @since 1.5.2
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*/
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function scram_request ($username,$cbf,$nonce) {
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return base64_encode($cbf.',,n='.$username.',r='.$nonce);
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}
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/**
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* Parse SCRAM challenge.
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* This function parses the challenge sent during SCRAM authentication and
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* returns an array. See the RFC for details on what's in the challenge string.
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*
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* @param string $challenge SCRAM Challenge
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* @param string $nonce Client's random nonce data
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*
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* @return array SCRAM challenge decoded data
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* or boolean FALSE
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*
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* @since 1.5.2
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*/
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function scram_parse_challenge ($challenge,$nonce) {
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$chall = base64_decode($challenge, true);
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if ($chall === false) {
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// The challenge must be base64 encoded
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return false;
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}
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// Chall should now be r=NONCE,s=SALT,i=ITER
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$sReq = explode(',', $chall);
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$serNonce = '';
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$serSalt = '';
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$serIter = 0;
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for($i = 0; $i < count($sReq); $i++) {
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switch(substr($sReq[$i], 0, 2)) {
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case 'r=':
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$serNonce = substr($sReq[$i], 2);
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break;
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case 's=':
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$serSalt = substr($sReq[$i], 2);
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break;
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case 'i=':
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$serIter = substr($sReq[$i], 2);
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break;
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}
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}
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if (strlen($serNonce) <= strlen($nonce)) {
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//the server 'r' value must be bigger than the client 'r' value
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return false;
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}
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if (substr($serNonce, 0, strlen($nonce)) !== $nonce) {
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// The server 'r' value must begin with the client 'r' value
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return false;
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}
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if (is_numeric($serIter)) {
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$serIter = intval($serIter);
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} else {
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// The iteration value must be a number
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return false;
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}
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$serSaltV = base64_decode($serSalt, true);
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if ($serSaltV === false) {
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// The salt must be base64-encoded
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return false;
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}
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$parsed = array();
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$parsed['r'] = $serNonce;
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$parsed['s'] = $serSaltV;
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$parsed['i'] = $serIter;
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return $parsed;
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}
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/**
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* Build SCRAM response to challenge.
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* This function hashes the heck out of the password and all previous communications
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* to create a proof value which is then sent to the server as authentication.
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*
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* @param string $alg Hash algorithm to use ('sha1' or 'sha256')
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* @param string $username User ID
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* @param string $cbf Channel Binding Flag ('n', 'y', or 'p=tls-unique'/'p=tls-server-end-point')
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* @param string $cli_nonce Client's random nonce data
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* @param string $ser_nonce Client + Server's random nonce data
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* @param string $password User password supplied by User
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* @param string $salt Raw binary salt data, supplied by the server challenge
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* @param string $iter PBKDF2 iterations, supplied by the server challenge
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*
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* @return string The response to be sent to the server (base64 encoded)
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*
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* @since 1.5.2
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*/
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function scram_response ($alg,$username,$cbf,$cli_nonce,$ser_nonce,$password,$salt,$iter) {
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// salt and hash password
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$salted_pass = hash_pbkdf2($alg, $password, $salt, $iter, 0, true);
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$cli_hash = hash_hmac($alg, 'Client Key', $salted_pass, true);
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$cli_key = hash($alg, $cli_hash, true);
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$c = base64_encode($cbf.',,');
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//generate unproofed communications
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$cli_request = 'n='.$username.',r='.$cli_nonce;
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$ser_challenge = 'r='.$ser_nonce.',s='.base64_encode($salt).',i='.$iter;
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$cli_response_unp = 'c='.$c.',r='.$ser_nonce;
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$comm_unp = $cli_request.','.$ser_challenge.','.$cli_response_unp;
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//hash unproofed communications
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$cli_sig = hash_hmac($alg, $comm_unp, $cli_key, true);
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$cli_proof = $cli_hash ^ $cli_sig;
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//generate proofed response
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$cli_response = $cli_response_unp.',p='.base64_encode($cli_proof);
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return base64_encode($cli_response);
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}
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/**
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* Verify SCRAM server response.
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* The final step in SCRAM is to make sure the server isn't just faking validation.
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* This is done by hashing the unproofed communications with a 'Server Key'
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* version of the hashed password, and comparing it with the server's final SCRAM message.
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*
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* @param string $alg Hash algorithm to use ('sha1' or 'sha256')
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* @param string $username User ID
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* @param string $cbf Channel Binding Flag ('n', 'y', or 'p=tls-unique'/'p=tls-server-end-point')
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* @param string $cli_nonce Client's random nonce data
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* @param string $ser_nonce Client + Server's random nonce data
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* @param string $password User password supplied by User
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* @param string $salt Raw binary salt data, supplied by the server challenge
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* @param string $iter PBKDF2 iterations, supplied by the server challenge
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* @param string $proof The server's final SCRAM message (base64 encoded)
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*
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* @return boolean Success or failure
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*
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* @since 1.5.2
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*/
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function scram_verify ($alg,$username,$cbf,$cli_nonce,$ser_nonce,$password,$salt,$iter,$proof) {
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$proof = base64_decode($proof, true);
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if ($proof === false) {
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// The proof must be base64 encoded
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return false;
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}
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if (substr($proof, 0, 2) !== 'v=') {
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// The proof was not provided correctly
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return false;
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}
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$proof = substr($proof, 2);
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$proof = base64_decode($proof, true);
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if ($proof === false) {
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// The proof v value must be base64 encoded
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return false;
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}
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// salt and hash password
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$salted_pass = hash_pbkdf2($alg, $password, $salt, $iter, 0, true);
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$cli_hash = hash_hmac($alg, 'Client Key', $salted_pass, true);
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$cli_key = hash($alg, $cli_hash, true);
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$c = base64_encode($cbf.',,');
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//generate unproofed communications
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$cli_request = 'n='.$username.',r='.$cli_nonce;
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$ser_challenge = 'r='.$ser_nonce.',s='.base64_encode($salt).',i='.$iter;
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$cli_response_unp = 'c='.$c.',r='.$ser_nonce;
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$comm_unp = $cli_request.','.$ser_challenge.','.$cli_response_unp;
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//hash for server
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$ser_hash = hash_hmac($alg, 'Server Key', $salted_pass, true);
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$ser_proof = hash_hmac($alg, $comm_unp, $ser_hash, true);
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return $ser_proof === $proof;
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}
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/**
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* Given the challenge from the server, supply the response using cram-md5 (See
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* RFC 2195 for details)
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*
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* @param string $username User ID
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* @param string $password User password supplied by User
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* @param string $challenge The challenge supplied by the server
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* @return string The response to be sent to the IMAP server
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* @since 1.4.0
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*/
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function cram_md5_response ($username,$password,$challenge) {
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$challenge=base64_decode($challenge);
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$hash=bin2hex(hmac_md5($challenge,$password));
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$response=base64_encode($username . " " . $hash) . "\r\n";
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return $response;
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}
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/**
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* Return Digest-MD5 response.
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* Given the challenge from the server, calculate and return the
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* response-string for digest-md5 authentication. (See RFC 2831 for more
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* details)
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*
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* @param string $username User ID
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* @param string $password User password supplied by User
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* @param string $challenge The challenge supplied by the server
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* @param string $service The service name, usually 'imap'; it is used to
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* define the digest-uri.
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* @param string $host The host name, usually the server's FQDN; it is used to
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* define the digest-uri.
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* @param string $authz Authorization ID (since 1.5.2)
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* @return string The response to be sent to the IMAP server
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* @since 1.4.0
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*/
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function digest_md5_response ($username,$password,$challenge,$service,$host,$authz='') {
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$result=digest_md5_parse_challenge($challenge);
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//FIXME we should check that $result contains the expected values that we use below
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// verify server supports qop=auth
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// $qop = explode(",",$result['qop']);
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//if (!in_array("auth",$qop)) {
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// rfc2831: client MUST fail if no qop methods supported
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// return false;
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//}
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$cnonce = base64_encode(bin2hex(hmac_md5(microtime())));
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$ncount = "00000001";
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/* This can be auth (authentication only), auth-int (integrity protection), or
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auth-conf (confidentiality protection). Right now only auth is supported.
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DO NOT CHANGE THIS VALUE */
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$qop_value = "auth";
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$digest_uri_value = $service . '/' . $host;
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// build the $response_value
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//FIXME This will probably break badly if a server sends more than one realm
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$string_a1 = utf8_encode($username).":";
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$string_a1 .= utf8_encode($result['realm']).":";
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$string_a1 .= utf8_encode($password);
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$string_a1 = hmac_md5($string_a1);
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$A1 = $string_a1 . ":" . $result['nonce'] . ":" . $cnonce;
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if(!empty($authz)) {
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$A1 .= ":" . utf8_encode($authz);
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}
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$A1 = bin2hex(hmac_md5($A1));
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$A2 = "AUTHENTICATE:$digest_uri_value";
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// If qop is auth-int or auth-conf, A2 gets a little extra
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if ($qop_value != 'auth') {
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$A2 .= ':00000000000000000000000000000000';
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}
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$A2 = bin2hex(hmac_md5($A2));
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$string_response = $result['nonce'] . ':' . $ncount . ':' . $cnonce . ':' . $qop_value;
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$response_value = bin2hex(hmac_md5($A1.":".$string_response.":".$A2));
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$reply = 'charset=utf-8,username="' . $username . '",realm="' . $result["realm"] . '",';
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$reply .= 'nonce="' . $result['nonce'] . '",nc=' . $ncount . ',cnonce="' . $cnonce . '",';
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$reply .= "digest-uri=\"$digest_uri_value\",response=$response_value";
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$reply .= ',qop=' . $qop_value;
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if(!empty($authz)) {
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$reply .= ',authzid=' . $authz;
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}
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$reply = base64_encode($reply);
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return $reply . "\r\n";
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}
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/**
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* Parse Digest-MD5 challenge.
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* This function parses the challenge sent during DIGEST-MD5 authentication and
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* returns an array. See the RFC for details on what's in the challenge string.
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*
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* @param string $challenge Digest-MD5 Challenge
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* @return array Digest-MD5 challenge decoded data
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* @since 1.4.0
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*/
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function digest_md5_parse_challenge($challenge) {
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$challenge=base64_decode($challenge);
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$parsed = array();
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while (!empty($challenge)) {
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if ($challenge[0] == ',') { // First char is a comma, must not be 1st time through loop
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$challenge=substr($challenge,1);
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}
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$key=explode('=',$challenge,2);
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|
$challenge=$key[1];
|
|
$key=$key[0];
|
|
if ($challenge[0] == '"') {
|
|
// We're in a quoted value
|
|
// Drop the first quote, since we don't care about it
|
|
$challenge=substr($challenge,1);
|
|
// Now explode() to the next quote, which is the end of our value
|
|
$val=explode('"',$challenge,2);
|
|
$challenge=$val[1]; // The rest of the challenge, work on it in next iteration of loop
|
|
$value=explode(',',$val[0]);
|
|
// Now, for those quoted values that are only 1 piece..
|
|
if (sizeof($value) == 1) {
|
|
$value=$value[0]; // Convert to non-array
|
|
}
|
|
} else {
|
|
// We're in a "simple" value - explode to next comma
|
|
$val=explode(',',$challenge,2);
|
|
if (isset($val[1])) {
|
|
$challenge=$val[1];
|
|
} else {
|
|
unset($challenge);
|
|
}
|
|
$value=$val[0];
|
|
}
|
|
$parsed["$key"]=$value;
|
|
} // End of while loop
|
|
return $parsed;
|
|
}
|
|
|
|
/**
|
|
* Creates a HMAC digest that can be used for authentication purposes
|
|
* See RFCs 2104, 2617, 2831
|
|
*
|
|
* Uses PHP's Hash extension if available (enabled by default in PHP
|
|
* 5.1.2+ - see http://www.php.net/manual/en/hash.requirements.php
|
|
* or, if installed on earlier PHP versions, the PECL hash module -
|
|
* see http://pecl.php.net/package/hash
|
|
*
|
|
* Otherwise, will attempt to use the Mhash extension - see
|
|
* http://www.php.net/manual/en/mhash.requirements.php
|
|
*
|
|
* Finally, a fall-back custom implementation is used if none of
|
|
* the above are available.
|
|
*
|
|
* @param string $data The data to be encoded/hashed
|
|
* @param string $key The (shared) secret key that will be used
|
|
* to build the keyed hash. This argument is
|
|
* technically optional, but only for internal
|
|
* use (when the custom hash implementation is
|
|
* being used) - external callers should always
|
|
* specify a value for this argument.
|
|
*
|
|
* @return string The HMAC-MD5 digest string
|
|
* @since 1.4.0
|
|
*
|
|
*/
|
|
function hmac_md5($data, $key='') {
|
|
|
|
// use PHP's native Hash extension if possible
|
|
//
|
|
if (function_exists('hash_hmac'))
|
|
return pack('H*', hash_hmac('md5', $data, $key));
|
|
|
|
|
|
// otherwise, use (obsolete) mhash extension if available
|
|
//
|
|
if (extension_loaded('mhash')) {
|
|
|
|
if ($key == '')
|
|
$mhash = mhash(MHASH_MD5, $data);
|
|
else
|
|
$mhash = mhash(MHASH_MD5, $data, $key);
|
|
|
|
return $mhash;
|
|
}
|
|
|
|
|
|
// or, our own implementation...
|
|
//
|
|
if (!$key)
|
|
return pack('H*', md5($data));
|
|
|
|
$key = str_pad($key, 64, chr(0x00));
|
|
|
|
if (strlen($key) > 64)
|
|
$key = pack("H*", md5($key));
|
|
|
|
$k_ipad = $key ^ str_repeat(chr(0x36), 64);
|
|
$k_opad = $key ^ str_repeat(chr(0x5c), 64);
|
|
|
|
$hmac = hmac_md5($k_opad . pack('H*', md5($k_ipad . $data)));
|
|
|
|
return $hmac;
|
|
|
|
}
|
|
|
|
/**
|
|
* Fillin user and password based on SMTP auth settings.
|
|
*
|
|
* @param string $user Reference to SMTP username
|
|
* @param string $pass Reference to SMTP password (unencrypted)
|
|
* @since 1.4.11
|
|
*/
|
|
function get_smtp_user(&$user, &$pass) {
|
|
global $username, $smtp_auth_mech,
|
|
$smtp_sitewide_user, $smtp_sitewide_pass;
|
|
|
|
if ($smtp_auth_mech == 'none') {
|
|
$user = '';
|
|
$pass = '';
|
|
} elseif ( isset($smtp_sitewide_user) && isset($smtp_sitewide_pass) &&
|
|
!empty($smtp_sitewide_user)) {
|
|
$user = $smtp_sitewide_user;
|
|
$pass = $smtp_sitewide_pass;
|
|
} else {
|
|
$user = $username;
|
|
$pass = sqauth_read_password();
|
|
}
|
|
|
|
// plugin authors note: override $user or $pass by
|
|
// directly changing the arguments array contents
|
|
// in your plugin e.g., $args[0] = 'new_username';
|
|
//
|
|
// NOTE: there is another hook in class/deliver/Deliver_SMTP.class.php
|
|
// called "smtp_authenticate" that allows a plugin to run its own
|
|
// custom authentication routine - this hook here is thus slightly
|
|
// mis-named but is too old to change. Be careful that you do not
|
|
// confuse your hook names.
|
|
//
|
|
$temp = array(&$user, &$pass);
|
|
do_hook('smtp_auth', $temp);
|
|
}
|