3 * Check for valid user via login form or stored cookie. Returns true or an error message
6 function yourls_is_valid_user() {
12 // Allow plugins to short-circuit the whole function
13 $pre = yourls_apply_filter( 'shunt_is_valid_user', null );
14 if ( null !== $pre ) {
15 $valid = ( $pre === true ) ;
19 // $unfiltered_valid : are credentials valid? Boolean value. It's "unfiltered" to allow plugins to eventually filter it.
20 $unfiltered_valid = false;
23 if( isset( $_GET['action'] ) && $_GET['action'] == 'logout' ) {
24 yourls_do_action( 'logout' );
25 yourls_store_cookie( null );
26 return yourls__( 'Logged out successfully' );
29 // Check cookies or login request. Login form has precedence.
31 yourls_do_action( 'pre_login' );
33 // Determine auth method and check credentials
35 // API only: Secure (no login or pwd) and time limited token
36 // ?timestamp=12345678&signature=md5(totoblah12345678)
38 isset( $_REQUEST['timestamp'] ) && !empty($_REQUEST['timestamp'] ) &&
39 isset( $_REQUEST['signature'] ) && !empty($_REQUEST['signature'] )
42 yourls_do_action( 'pre_login_signature_timestamp' );
43 $unfiltered_valid = yourls_check_signature_timestamp();
47 // API only: Secure (no login or pwd)
48 // ?signature=md5(totoblah)
50 !isset( $_REQUEST['timestamp'] ) &&
51 isset( $_REQUEST['signature'] ) && !empty( $_REQUEST['signature'] )
54 yourls_do_action( 'pre_login_signature' );
55 $unfiltered_valid = yourls_check_signature();
59 // API or normal: login with username & pwd
60 ( isset( $_REQUEST['username'] ) && isset( $_REQUEST['password'] )
61 && !empty( $_REQUEST['username'] ) && !empty( $_REQUEST['password'] ) )
63 yourls_do_action( 'pre_login_username_password' );
64 $unfiltered_valid = yourls_check_username_password();
68 // Normal only: cookies
70 isset( $_COOKIE['yourls_username'] ) )
72 yourls_do_action( 'pre_login_cookie' );
73 $unfiltered_valid = yourls_check_auth_cookie();
76 // Regardless of validity, allow plugins to filter the boolean and have final word
77 $valid = yourls_apply_filter( 'is_valid_user', $unfiltered_valid );
81 yourls_do_action( 'login' );
83 // (Re)store encrypted cookie if needed
84 if ( !yourls_is_API() ) {
85 yourls_store_cookie( YOURLS_USER );
87 // Login form : redirect to requested URL to avoid re-submitting the login form on page reload
88 if( isset( $_REQUEST['username'] ) && isset( $_REQUEST['password'] ) ) {
89 $url = $_SERVER['REQUEST_URI'];
90 yourls_redirect( $url );
99 yourls_do_action( 'login_failed' );
101 if ( isset( $_REQUEST['username'] ) || isset( $_REQUEST['password'] ) ) {
102 return yourls__( 'Invalid username or password' );
104 return yourls__( 'Please log in' );
109 * Check auth against list of login=>pwd. Sets user if applicable, returns bool
112 function yourls_check_username_password() {
113 global $yourls_user_passwords;
114 if( isset( $yourls_user_passwords[ $_REQUEST['username'] ] ) && yourls_check_password_hash( $_REQUEST['username'], $_REQUEST['password'] ) ) {
115 yourls_set_user( $_REQUEST['username'] );
122 * Check a submitted password sent in plain text against stored password which can be a salted hash
125 function yourls_check_password_hash( $user, $submitted_password ) {
126 global $yourls_user_passwords;
128 if( !isset( $yourls_user_passwords[ $user ] ) )
131 if ( yourls_has_phpass_password( $user ) ) {
132 // Stored password is hashed with phpass
133 $hasher = new PasswordHash( 8, false );
134 list( , $hash ) = explode( ':', $yourls_user_passwords[ $user ] );
135 $hash = str_replace( '!', '$', $hash );
136 return ( $hasher->CheckPassword( $submitted_password, $hash ) );
137 } else if( yourls_has_md5_password( $user ) ) {
138 // Stored password is a salted md5 hash: "md5:<$r = rand(10000,99999)>:<md5($r.'thepassword')>"
139 list( , $salt, ) = explode( ':', $yourls_user_passwords[ $user ] );
140 return( $yourls_user_passwords[ $user ] == 'md5:'.$salt.':'.md5( $salt . $submitted_password ) );
142 // Password stored in clear text
143 return( $yourls_user_passwords[ $user ] == $submitted_password );
148 * Overwrite plaintext passwords in config file with phpassed versions.
151 * @return true if overwrite was successful, an error message otherwise
153 function yourls_hash_passwords_now() {
154 global $yourls_user_passwords;
156 if( !is_readable( YOURLS_CONFIGFILE ) )
157 return 'cannot read file'; // not sure that can actually happen...
159 if( !is_writable( YOURLS_CONFIGFILE ) )
160 return 'cannot write file';
162 $configdata = file_get_contents( YOURLS_CONFIGFILE );
163 if( $configdata == false )
164 return 'could not read file';
166 $to_hash = 0; // keep track of number of passwords that need hashing
167 $hasher = new PasswordHash( 8, false );
168 foreach ( $yourls_user_passwords as $user => $password ) {
169 if ( !yourls_has_phpass_password( $user ) && !yourls_has_md5_password( $user ) ) {
171 $hash = $hasher->HashPassword( $password );
172 // PHP would interpret $ as a variable, so replace it in storage.
173 $hash = str_replace( '$', '!', $hash );
175 $pattern = "/[$quotes]${user}[$quotes]\s*=>\s*[$quotes]" . preg_quote( $password, '-' ) . "[$quotes]/";
176 $replace = "'$user' => 'phpass:$hash' /* Password encrypted by YOURLS */ ";
178 $configdata = preg_replace( $pattern, $replace, $configdata, -1, $count );
179 // There should be exactly one replacement. Otherwise, fast fail.
182 $ydb->debug_log[] = "Problem with preg_replace for password hash of user $user";
183 return 'preg_replace problem';
189 return true; // There was no password to encrypt
191 $success = file_put_contents( YOURLS_CONFIGFILE, $configdata );
192 if ( $success === FALSE ) {
194 $ydb->debug_log[] = "Failed writing to " . YOURLS_CONFIGFILE;
195 return 'could not write file';
201 * Check to see if any passwords are stored as cleartext.
204 * @return bool true if any passwords are cleartext
206 function yourls_has_cleartext_passwords() {
207 global $yourls_user_passwords;
208 foreach ( $yourls_user_passwords as $user => $pwdata ) {
209 if ( !yourls_has_md5_password( $user ) && !yourls_has_phpass_password( $user ) ) {
217 * Check if a user has a hashed password
219 * Check if a user password is 'md5:[38 chars]'.
220 * TODO: deprecate this when/if we have proper user management with password hashes stored in the DB
223 * @param string $user user login
224 * @return bool true if password hashed, false otherwise
226 function yourls_has_md5_password( $user ) {
227 global $yourls_user_passwords;
228 return( isset( $yourls_user_passwords[ $user ] )
229 && substr( $yourls_user_passwords[ $user ], 0, 4 ) == 'md5:'
230 && strlen( $yourls_user_passwords[ $user ] ) == 42 // http://www.google.com/search?q=the+answer+to+life+the+universe+and+everything
235 * Check if a user's password is hashed with PHPASS.
237 * Check if a user password is 'phpass:[lots of chars]'.
238 * TODO: deprecate this when/if we have proper user management with password hashes stored in the DB
241 * @param string $user user login
242 * @return bool true if password hashed with PHPASS, otherwise false
244 function yourls_has_phpass_password( $user ) {
245 global $yourls_user_passwords;
246 return( isset( $yourls_user_passwords[ $user ] )
247 && substr( $yourls_user_passwords[ $user ], 0, 7 ) == 'phpass:'
252 * Check auth against encrypted COOKIE data. Sets user if applicable, returns bool
255 function yourls_check_auth_cookie() {
256 global $yourls_user_passwords;
257 foreach( $yourls_user_passwords as $valid_user => $valid_password ) {
258 if ( yourls_salt( $valid_user ) == $_COOKIE['yourls_username'] ) {
259 yourls_set_user( $valid_user );
267 * Check auth against signature and timestamp. Sets user if applicable, returns bool
270 function yourls_check_signature_timestamp() {
271 // Timestamp in PHP : time()
272 // Timestamp in JS: parseInt(new Date().getTime() / 1000)
273 global $yourls_user_passwords;
274 foreach( $yourls_user_passwords as $valid_user => $valid_password ) {
277 md5( $_REQUEST['timestamp'].yourls_auth_signature( $valid_user ) ) == $_REQUEST['signature']
279 md5( yourls_auth_signature( $valid_user ).$_REQUEST['timestamp'] ) == $_REQUEST['signature']
282 yourls_check_timestamp( $_REQUEST['timestamp'] )
284 yourls_set_user( $valid_user );
292 * Check auth against signature. Sets user if applicable, returns bool
295 function yourls_check_signature() {
296 global $yourls_user_passwords;
297 foreach( $yourls_user_passwords as $valid_user => $valid_password ) {
298 if ( yourls_auth_signature( $valid_user ) == $_REQUEST['signature'] ) {
299 yourls_set_user( $valid_user );
307 * Generate secret signature hash
310 function yourls_auth_signature( $username = false ) {
311 if( !$username && defined('YOURLS_USER') ) {
312 $username = YOURLS_USER;
314 return ( $username ? substr( yourls_salt( $username ), 0, 10 ) : 'Cannot generate auth signature: no username' );
318 * Check if timestamp is not too old
321 function yourls_check_timestamp( $time ) {
323 // Allow timestamp to be a little in the future or the past -- see Issue 766
324 return yourls_apply_filter( 'check_timestamp', abs( $now - $time ) < YOURLS_NONCE_LIFE, $time );
328 * Store new cookie. No $user will delete the cookie.
331 function yourls_store_cookie( $user = null ) {
334 $time = time() - 3600;
336 global $yourls_user_passwords;
337 if( isset($yourls_user_passwords[$user]) ) {
338 $pass = $yourls_user_passwords[$user];
340 die( 'Stealing cookies?' ); // This should never happen
342 $time = time() + YOURLS_COOKIE_LIFE;
345 $domain = yourls_apply_filter( 'setcookie_domain', parse_url( YOURLS_SITE, 1 ) );
346 $secure = yourls_apply_filter( 'setcookie_secure', yourls_is_ssl() );
347 $httponly = yourls_apply_filter( 'setcookie_httponly', true );
349 if ( !headers_sent() ) {
350 // Set httponly if the php version is >= 5.2.0
351 if( version_compare( phpversion(), '5.2.0', 'ge' ) ) {
352 setcookie('yourls_username', yourls_salt( $user ), $time, '/', $domain, $secure, $httponly );
354 setcookie('yourls_username', yourls_salt( $user ), $time, '/', $domain, $secure );
357 // For some reason cookies were not stored: action to be able to debug that
358 yourls_do_action( 'setcookie_failed', $user );
366 function yourls_set_user( $user ) {
367 if( !defined( 'YOURLS_USER' ) )
368 define( 'YOURLS_USER', $user );