2 // Check for valid user. Returns true or an error message
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3 function yourls_is_valid_user() {
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4 static $valid = false;
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10 if( isset( $_GET['action'] ) && $_GET['action'] == 'logout') {
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11 yourls_store_cookie( null );
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12 return 'Logged out successfully';
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15 // Check cookies or login request. Login form has precedence.
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16 global $yourls_user_passwords;
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18 // Determine auth method and check credentials
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20 // API only: Secure (no login or pwd) and time limited token
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21 // ?timestamp=12345678&signature=md5(totoblah12345678)
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22 ( yourls_is_API() &&
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23 isset($_REQUEST['timestamp']) && !empty($_REQUEST['timestamp']) &&
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24 isset($_REQUEST['signature']) && !empty($_REQUEST['signature'])
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27 $valid = yourls_check_signature_timestamp();
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31 // API only: Secure (no login or pwd)
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32 // ?signature=md5(totoblah)
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33 ( yourls_is_API() &&
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34 !isset($_REQUEST['timestamp']) &&
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35 isset($_REQUEST['signature']) && !empty($_REQUEST['signature'])
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38 $valid = yourls_check_signature();
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42 // API or normal: login with username & pwd
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43 ( isset($_REQUEST['username']) && isset($_REQUEST['password'])
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44 && !empty( $_REQUEST['username'] ) && !empty( $_REQUEST['password'] ) )
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46 $valid = yourls_check_username_password();
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50 // Normal only: cookies
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51 ( !yourls_is_API() &&
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52 isset($_COOKIE['yourls_username']) && isset($_COOKIE['yourls_password']) )
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54 $valid = yourls_check_auth_cookie();
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57 // Login for the win!
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59 // (Re)store encrypted cookie and tell it's ok
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60 if ( !yourls_is_API() ) // No need to store a cookie when used in API mode.
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61 yourls_store_cookie( YOURLS_USER );
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66 if ( isset($_REQUEST['username']) || isset($_REQUEST['password']) ) {
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67 return 'Invalid username or password';
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69 return 'Please log in';
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73 // Check auth against list of login=>pwd. Sets user if applicable, returns bool
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74 function yourls_check_username_password() {
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75 global $yourls_user_passwords;
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76 if( isset( $yourls_user_passwords[ $_REQUEST['username'] ] ) && yourls_check_password_hash( $yourls_user_passwords[ $_REQUEST['username'] ], $_REQUEST['password'] ) ) {
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77 yourls_set_user( $_REQUEST['username'] );
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83 // Check a REQUEST password sent in plain text against stored password which can be a salted hash
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84 function yourls_check_password_hash( $stored, $plaintext ) {
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85 if ( substr( $stored, 0, 4 ) == 'md5:' and strlen( $stored ) == 42 ) {
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86 // Stored password is a salted hash: "md5:<$r = rand(10000,99999)>:<md5($r.'thepassword')>"
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87 // And 42. Of course. http://www.google.com/search?q=the+answer+to+life+the+universe+and+everything
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88 list( $temp, $salt, $md5 ) = split( ':', $stored );
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89 return( $stored == 'md5:'.$salt.':'.md5( $salt.$plaintext ) );
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91 // Password was sent in clear
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92 return( $stored == $plaintext );
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97 // Check auth against encrypted COOKIE data. Sets user if applicable, returns bool
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98 function yourls_check_auth_cookie() {
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99 global $yourls_user_passwords;
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100 foreach( $yourls_user_passwords as $valid_user => $valid_password ) {
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102 yourls_salt($valid_user) == $_COOKIE['yourls_username']
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103 && yourls_salt($valid_password) == $_COOKIE['yourls_password']
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105 yourls_set_user( $valid_user );
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112 // Check auth against signature and timestamp. Sets user if applicable, returns bool
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113 function yourls_check_signature_timestamp() {
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114 // Timestamp in PHP : time()
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115 // Timestamp in JS: parseInt(new Date().getTime() / 1000)
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116 global $yourls_user_passwords;
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117 foreach( $yourls_user_passwords as $valid_user => $valid_password ) {
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120 md5( $_REQUEST['timestamp'].yourls_auth_signature( $valid_user ) ) == $_REQUEST['signature']
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122 md5( yourls_auth_signature( $valid_user ).$_REQUEST['timestamp'] ) == $_REQUEST['signature']
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125 yourls_check_timestamp( $_REQUEST['timestamp'] )
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127 yourls_set_user( $valid_user );
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134 // Check auth against signature. Sets user if applicable, returns bool
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135 function yourls_check_signature() {
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136 global $yourls_user_passwords;
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137 foreach( $yourls_user_passwords as $valid_user => $valid_password ) {
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138 if ( yourls_auth_signature( $valid_user ) == $_REQUEST['signature'] ) {
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139 yourls_set_user( $valid_user );
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146 // Generate secret signature hash
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147 function yourls_auth_signature( $username = false ) {
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148 if( !$username && defined('YOURLS_USER') ) {
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149 $username = YOURLS_USER;
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151 return ( $username ? substr( yourls_salt( $username ), 0, 10 ) : 'Cannot generate auth signature: no username' );
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154 // Check a timestamp is from the past and not too old
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155 function yourls_check_timestamp( $time ) {
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157 return ( $now >= $time && ceil( $now - $time ) < YOURLS_NONCE_LIFE );
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160 // Store new cookie. No $user will delete the cookie.
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161 function yourls_store_cookie( $user = null ) {
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164 $time = time() - 3600;
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166 global $yourls_user_passwords;
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167 if( isset($yourls_user_passwords[$user]) ) {
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168 $pass = $yourls_user_passwords[$user];
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170 die('Stealing cookies?'); // This should never happen
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172 $time = time() + YOURLS_COOKIE_LIFE;
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175 $domain = yourls_apply_filter( 'setcookie_domain', parse_url( YOURLS_SITE, 1 ) );
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176 $secure = yourls_apply_filter( 'setcookie_secure', yourls_is_ssl() );
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177 $httponly = yourls_apply_filter( 'setcookie_httponly', true );
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179 if ( !headers_sent() ) {
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180 // Set httponly if the php version is >= 5.2.0
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181 if( version_compare( phpversion(), '5.2.0', 'ge' ) ) {
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182 setcookie('yourls_username', yourls_salt( $user ), $time, '/', $domain, $secure, $httponly );
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183 setcookie('yourls_password', yourls_salt( $pass ), $time, '/', $domain, $secure, $httponly );
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185 setcookie('yourls_username', yourls_salt( $user ), $time, '/', $domain, $secure );
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186 setcookie('yourls_password', yourls_salt( $pass ), $time, '/', $domain, $secure );
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192 function yourls_set_user( $user ) {
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193 if( !defined('YOURLS_USER') )
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194 define('YOURLS_USER', $user);
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