Subversion Repositories phpLibraryV2

<?php

   /*

    * Filename: auth.class.php

    * 

    * Description:

    *    Authorization class for web application.

    *    Requires database table with following minimal structure

    *       id           int unsigned not null auto_increment

    *       name         varchar(64)

    *       passwd       varchar(256)

    *       access       text

    *    defaults are table _user, with columns name, passwd and access

    *    name and pass are matched against database entries, then name

    *    and access are stored in instantiation of class

    * 

    *    passwd should be able to handle 256 chars as hashes become

    *    longer.

    *

    * 

    * $Rev:: 8            $: Revision in Repository

    * $Author:: rodolico  $: Last Author

    * $Date:: 2017-07-28 0$: Last Commit

    * 

    * 

    * History:

    * 20170728 - RWR - 1.0

    *    Initial build

    */

   require_once( 'DBQuery.class.php' );

   global $DEBUG;

   class Auth {

      // all data stored in $parameters. We will initialize $parameters

      // with some default data

      protected $parameters = array(

                               'table name' => '_user', // table storing auth info

                               'column username' => 'username', // field to match username to

                               'column password' => 'passwd', // field to match password to

                               'column access' => 'access',    // field which contains access information

                               'column id' => '_user_id', // unique user id in table

                            );

      // constructor simply loads parameters into array from 

      public function __construct( $parameters = array() ) {

         // first, gather all info from the parameters array

         foreach ( $parameters as $key  => $value )

            $this->parameters[$key] = $value;

         $this->logIt( 1, 'Constructed Auth' );

      } // construct

      protected function logIt ( $level, $message, $file = null, $class = null, $function = null, $line = null ) {

         global $DEBUG;

         if ( isset( $DEBUG ) ) {

            $DEBUG->writeLog( $level, $message, $file, $class, $function, $line );

         }

      } // logIt

      public function save() {

         return $this->parameters;

      } // save

      public function load( $parameters ) {

         $this->parameters = $parameters;

      } // load

      public function __get( $parameter ) {

         return $this->parameters[$parameter];

      } // function get

      public function __set ($parameter, $value ) {

         $oldValue = $this->parameters[$parameter];

         $this->parameters[$parameter] = $value;

         return $oldValue;

      } // function set

      /* 

      * authorizes access to a resource

      * just a shell at this time.

      */

      public function authorize ( $resource = '' )  {

         if ( isset( $this->parameters['username'] ) ) {

            /* 

            * code here to actually determine if user is authorized

            * for this page

            */

            return true;

         } elseif ( isset( $this->parameters['login page'] ) ) {

            // redirect to login page

            $loginPage = $this->parameters['login page'];

            header( "Location: $loginPage" );

            exit();

         } else {

            print $this->createLoginPage();

            exit();

         }

      } // function authorize

      /*

      * Checks if the username and password are valid.

      * username can either be taken from parameters or from $this->parameters

      * on success, sets username, password, user_id and access from

      * database (I know username should not change, but I want the db val

      */

      function verifyLogin( $password, $username = null ) {

         if ( isset( $username ) ) 

            $this->parameters['username'] = $username;

         if ( isset( $this->parameters['username'] ) && isset( $password ) ) {

            $sql = "select " . 

                     $this->parameters['column id'] . " 'id'," .

                     $this->parameters['column username'] . " 'username'," .

                     $this->parameters['column password'] . " 'password'," .

                     $this->parameters['column access'] . " 'access' " .

                  " from " .

                     $this->parameters['table name'] .

                  " where " .

                     $this->parameters['column username'] . " = " . 

                        DBQuery::makeSafeSQLConstant( $this->parameters['username'] );

            $this->logIt( 3, "Query = $sql", null, __CLASS__, __FUNCTION__, __LINE__ );

            $results = new DBQuery( $sql );

            if ( $results->getOneRow() ) {

               // a special case is when the password stored in the database is null

               // in which case we give full access. This allows us to do a manual reset

               // if passwords are lost.

               $data = $results->__get( 'returnData' );

               $this->logIt( 4, "\nResults = \n" . print_r( $results, true) , null, __CLASS__, __FUNCTION__, __LINE__ );

               $this->logIt( 3, "\nData = \n" . print_r( $data, true) , null, __CLASS__, __FUNCTION__, __LINE__ );

               if ( $data->password == '' || $data->password == null || password_verify( $password, $data->password ) ) {

                  $this->parameters['username'] = $data['username'];

                  $this->parameters['user_id'] = $data['id'];

                  $this->parameters['access'] = $data['access'];

                  $this->logIt( 2, "Access Granted = \n" . print_r( array( 'username' => $data['username'], 'user_id' => $data['id'], 'access' => $data['access'] ), true) , null, __CLASS__, __FUNCTION__, __LINE__ );

                  return array( 'username' => $data['username'], 'user_id' => $data['id'], 'access' => $data['access'] );

               } // if password verifies

            } // if the query executed

         } // if we have a username and a password

         return false;

      } // function verifyLogin

      /* update password hash from parameter passed in, saving it in database */

      function setPassword ( $password ) {

         $hash = password_hash( $password, PASSWORD_DEFAULT );

         $sql = "update $this->parameters[table name] 

               set $this->parameters[column password] = '$hash' 

               where $this->parameters[column id] = $this->parameters[user id]";

         return new DBQuery( $sql, true );

      } // setPassword

      public function createLoginPage () {

       return '<?php

            session_start();

            if (isset( $_POST["submit"])) {

            include_once( "Auth.class.php" );

            $_SESSION["authorization information"] = new Auth();

            ?>

            <html><body>

            <h3 align="center">Enter your username and password below</h3>

                     <FORM action="login.html" method="POST" enctype="multipart/form-data">

                       <table border="1" cellpadding="2" align="center">

                       <tbody>

                         <tr>

                           <td>User Name</td>

                           <td><input type="text" name="login" size="20"></td>

                         </tr>

                         <tr>

                           <td>Password</td>

                           <td><input type="password" name="pass" size="20"></td>

                         </tr>

                         <tr><TD colspan="2" align="center"><INPUT type="submit" name="Login" value="Log In"></TD></tr>

                       </tbody>

                     </table>

                     </FORM></body></html>';

      } // function createLoginPag

   } // class Auth

?>