<?php
/*
 $Id: m_hta.php,v 1.5 2004/11/29 17:15:37 anonymous Exp $
 ----------------------------------------------------------------------
 AlternC - Web Hosting System
 Copyright (C) 2002 by the AlternC Development Team.
 http://alternc.org/
 ----------------------------------------------------------------------
 Based on:
 Valentin Lacambre's web hosting softwares: http://altern.org/
 ----------------------------------------------------------------------
 LICENSE

 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public License (GPL)
 as published by the Free Software Foundation; either version 2
 of the License, or (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 To read the license please visit http://www.gnu.org/copyleft/gpl.html
 ----------------------------------------------------------------------
 Original Author of file:
 Purpose of file:
 ----------------------------------------------------------------------
*/

/**
* This class handle folder web restricted access through .htaccess/.htpassword
* files.
* 
* Copyleft {@link http://alternc.net/ AlternC Team}
* 
* @copyright    AlternC-Team 2002-11-01 http://alternc.org/
* 
*/
class m_hta {


  /*---------------------------------------------------------------------------*/
  /**
   * Constructor
   */
  function m_webaccess() {
  }


  /**
   * Password kind used in this class (hook for admin class)
   */
  function alternc_password_policy() {
    return array("hta"=>"Protected folders passwords");
  }


  /*---------------------------------------------------------------------------*/
  /**
   * Create a protected folder (.htaccess et .htpasswd)
   * @param string $dir Folder to protect (relative to user root)
   * @return boolean TRUE if the folder has been protected, or FALSE if an error occurred
   */
  function CreateDir($dir) {
    global $mem,$bro,$err,$L_ALTERNC_LOC;
    $err->log("hta","createdir",$dir);
    $absolute=$bro->convertabsolute($dir,0);
    if (!$absolute) {
      $err->raise("hta",printf(_("The folder '%s' does not exist"),$dir));
      return false;
    }
    if (!file_exists($absolute)) {
      @mkdir($absolute,00777);
    }
    if (!file_exists("$absolute/.htaccess")) {
      if (!@touch("$absolute/.htaccess")) {
	$err->raise("hta",_("File already exist"));
	return false;
      }
      $file = @fopen("$absolute/.htaccess","r+");
      if (!$file) {
	$err->raise("hta",_("File already exist"));
        return false;
      }
      fseek($file,0);
      $param="AuthUserFile \"$absolute/.htpasswd\"\nAuthName \"Zone Protégée\"\nAuthType Basic\nrequire valid-user\n";
      fwrite($file, $param);
      fclose($file);
    }
    if (!file_exists("$absolute/.htpasswd")) {
      if (!touch("$absolute/.htpasswd")) {
	$err->raise("hta",_("File already exist"));
        return false;
      }
      return true;
    }
    return true;
  }


  /*---------------------------------------------------------------------------*/
  /**
   * Returns the list of all user folder currently protected by a .htpasswd file
   * @return array Array containing user folder list
   */

  function ListDir(){
    global$err,$mem,$L_ALTERNC_LOC;
    $err->log("hta","listdir");
    $sortie=array();
    $absolute="$L_ALTERNC_LOC/html/".substr($mem->user["login"],0,1)."/".$mem->user["login"];
    exec("find $absolute -name .htpasswd|sort",$sortie);
    if(!count($sortie)){
      $err->raise("hta",_("No protected folder"));
      return false;
    }
    $pattern="/^".preg_quote($L_ALTERNC_LOC,"/")."\/html\/.\/[^\/]*\/(.*)\/\.htpasswd/";
      for($i=0;$i<count($sortie);$i++){
      preg_match($pattern,$sortie[$i],$matches);
      $tmpm=isset($matches[1])?$matches[1]:'';
      $r[$i]=$tmpm."/";
    }
    return $r;
  }

  /*---------------------------------------------------------------------------*/
  /**
   * Tells if a folder is protected.
   * @param string $dir Folder to check
   * @return TRUE if the folder is protected, or FALSE if it is not
   */
  function is_protected($dir){
    global $mem,$err,$L_ALTERNC_LOC;
    $err->log("hta","is_protected",$dir);
    $absolute="$L_ALTERNC_LOC/html/".substr($mem->user["login"],0,1)."/".$mem->user["login"]."/$dir";
    $sortie=array();
    if (file_exists("$absolute/.htpasswd")){
      return true;
    }
    else {
      return false;
    }
  }


  /*---------------------------------------------------------------------------*/
  /**
   * Returns the list of login for a protected folder.
   * @param string $dir The folder to lookup (relative to user root)
   * @return array An array containing the list of logins from the .htpasswd file, or FALSE
   */
  function get_hta_detail($dir) {
    global $mem,$err,$L_ALTERNC_LOC;
    $err->log("hta","get_hta_detail");
    $absolute="$L_ALTERNC_LOC/html/".substr($mem->user["login"],0,1)."/".$mem->user["login"]."/$dir";
    if (file_exists("$absolute/.htaccess")) {
      /*		if (!_reading_htaccess($absolute)) {
			return false;
			}
      */	}
    $file = @fopen("$absolute/.htpasswd","r");
    $i=0;
    $res=array();
    if (!$file) {
      return false;
    }
    // TODO: Tester la validité du .htpasswd
    while (!feof($file)) {
      $s=fgets($file,1024);
      $t=explode(":",$s);
      if ($t[0]!=$s) {
	$res[$i]=$t[0];
	$i=$i+1;
      }
    }
    fclose($file);
    return $res;
  }


  /*---------------------------------------------------------------------------*/
  /**
   * Unprotect a folder
   * @param string $dir Folder to unprotect, relative to user root
   * @return boolean TRUE if the folder has been unprotected, or FALSE if an error occurred
   */
  function DelDir($dir) {
    global $mem,$bro,$err;
    $err->log("hta","deldir",$dir);
    $dir=$bro->convertabsolute($dir,0);
    if (!$dir) {
      $err->raise("hta",printf(("The folder '%s' does not exist"),$dir));
      return false;
    }
    if (!@unlink("$dir/.htaccess")) {
      $err->raise("hta",printf(_("I cannot delete the file '%s/.htaccess'"),$dir));
      return false;
    }
    if (!@unlink("$dir/.htpasswd")) {
      $err->raise("hta",printf(_("I cannot delete the file '%s/.htpasswd'"),$dir));
      return false;
    }
    return true;
  }


  /*---------------------------------------------------------------------------*/
  /**
   * Add a user to a protected folder
   * @param string $login The user login to add
   * @param string $password The password to add (cleartext)
   * @param string $dir The folder we add it to (relative to user root).
   * @return boolean TRUE if the user has been added, or FALSE if an error occurred
   */
  function add_user($user,$password,$dir) {
    global $err, $bro, $admin;
    $err->log("hta","add_user",$user."/".$dir);
    $absolute=$bro->convertabsolute($dir,0);
    if (!file_exists($absolute)) {
      $err->raise("hta",printf(("The folder '%s' does not exist"),$dir));
      return false;
    }
    if (checkloginmail($user)){
      // Check this password against the password policy using common API : 
      if (is_callable(array($admin,"checkPolicy"))) {
	if (!$admin->checkPolicy("hta",$user,$password)) {
	  return false; // The error has been raised by checkPolicy()
	}
      }

      $file = @fopen("$absolute/.htpasswd","a+");
      if (!$file) {
	$err->raise("hta",_("File already exist"));
	return false;
      }
      fseek($file,0);
      while (!feof($file)) {
	$s=fgets($file,1024);
	$t=explode(":",$s);
	if ($t[0]==$user) {
	  $err->raise("hta",printf(_("The user '%s' already exist for this folder"),$user));
	  return false;
	}
      }
      fseek($file,SEEK_END);
      if ( empty($t[1]) || substr($t[1],-1)!="\n") {
	fwrite($file,"\n");
      }
      fwrite($file, "$user:"._md5cr($password)."\n");
      fclose($file);
      return true;
    } else {
      $err->raise("hta",_("Please enter a valid username"));
      return false;
    }
  }


  /*---------------------------------------------------------------------------*/
  /**
   * Delete a user from a protected folder.
   * @param array $lst An array with login to delete.
   * @param string $dir The folder, relative to user root, where we want to delete users.
   * @return boolean TRUE if users has been deleted, or FALSE if an error occurred.
   */
  function del_user($lst,$dir) {
    global $bro,$err;
    $err->log("hta","del_user",$lst."/".$dir);
    $absolute=$bro->convertabsolute($dir,0);
    if (!file_exists($absolute)) {
      $err->raise("hta",printf(_("The folder '%s' does not exist"),$dir));
      return false;
    }
    touch("$absolute/.htpasswd.new");
    $file = fopen("$absolute/.htpasswd","r");
    $newf = fopen("$absolute/.htpasswd.new","a");
    if (!$file || !$newf) {
      $err->raise("hta",_("File already exist"));
      return false;
    }
    reset($lst);
    fseek($file,0);
    while (!feof($file)) {
      $s=fgets($file,1024);
      $t=explode(":",$s);
      if (!in_array($t[0],$lst) && ($t[0]!="\n")) {
	fseek($newf,0);
	fwrite($newf, "$s");
      }
    }
    fclose($file);
    fclose($newf);
    unlink("$absolute/.htpasswd");
    rename("$absolute/.htpasswd.new", "$absolute/.htpasswd");
    return true;
  }


  /*---------------------------------------------------------------------------*/
  /**
   * Change the password of a user in a protected folder
   * @param string $user The users whose password should be changed
   * @param string $newpass The new password of this user
   * @param string $dir The folder, relative to user root, in which we will change a password
   * @return boolean TRUE if the password has been changed, or FALSE if an error occurred
   */
  function change_pass($user,$newpass,$dir) {
    global $bro,$err,$admin;
    $err->log("hta","change_pass",$user."/".$dir);
    $absolute=$bro->convertabsolute($dir,0);
    if (!file_exists($absolute)) {
      $err->raise("hta",printf(_("The folder '%s' does not exist"),$dir));
      return false;
    }

    // Check this password against the password policy using common API : 
    if (is_callable(array($admin,"checkPolicy"))) {
      if (!$admin->checkPolicy("hta",$user,$newpass)) {
	return false; // The error has been raised by checkPolicy()
      }
    }

    touch("$absolute/.htpasswd.new");
    $file = fopen("$absolute/.htpasswd","r");
    $newf = fopen("$absolute/.htpasswd.new","a");
    if (!$file || !$newf) {
      $err->raise("hta",_("File already exist"));
      return false;
    }
    while (!feof($file)) {
      $s=fgets($file,1024);
      $t=explode(":",$s);
      if ($t[0]!=$user) {
	fwrite($newf, "$s");
      }
    }
    fwrite($newf, "$user:"._md5cr($newpass)."\n");
    fclose($file);
    fclose($newf);
    unlink("$absolute/.htpasswd");
    rename("$absolute/.htpasswd.new", "$absolute/.htpasswd");
    return true;
  }


  /*---------------------------------------------------------------------------*/
  /**
   * Check that a .htaccess file is valid (for authentication)
   * @param string $absolute Folder we want to check (relative to user root)
   * @return boolean TRUE is the .htaccess is protecting this folder, or FALSE else
   * @access private
   */
  function _reading_htaccess($absolute) {
    global $err;
    $err->log("hta","_reading_htaccess",$absolute);
    $file = fopen("$absolute/.htaccess","r+");
    $lignes=array(1,1,1);
    $errr=0;
    if (!$file) {
      return false;
    }
    while (!feof($file) && !$errr) {
      $s=fgets($file,1024);
      if (substr($s,0,12)!="RewriteCond " && substr($s,0,14)!="ErrorDocument " && substr($s,0,12)!="RewriteRule " && substr($s,0,14)!="RewriteEngine " && trim($s)!="") {
	$errr=1;
      }
      if (strtolower(trim($s))==strtolower("authuserfile $absolute/.htpasswd")) {
	$lignes[0]=0;
	$errr=0;
      } // authuserfile
      if (strtolower(trim($s))=="require valid-user") {
	$lignes[1]=0;
	$errr=0;
      } //require
      if (strtolower(trim($s))=="authtype basic") {
	$lignes[2]=0;
	$errr=0;
      } //authtype
    } // Reading config file
    fclose($file);
    if ($errr || in_array(0,$lignes)) {
      $err->raise("hta",_("An incompatible .htaccess file exists in this folder"));
      return false;
    }
    return true;
  } 

} /* CLASS m_hta */