caldav-ACL.php

<?php
dbg_error_log("ACL", "method handler");
 
require_once('DAVResource.php');
 
$request->NeedPrivilege('DAV::write-acl');
 
if ( ! ini_get('open_basedir') && (isset($c->dbg['ALL']) || (isset($c->dbg['put']) && $c->dbg['put'])) ) {
  $fh = fopen('/var/log/davical/MOVE.debug','w');
  if ( $fh ) {
    fwrite($fh,$request->raw_post);
    fclose($fh);
  }
}
 
$resource = new DAVResource( $request->path );

 
$xmltree = BuildXMLTree( $request->xml_tags );
$aces = $xmltree->GetPath("/DAV::acl/*");
 
$grantor = new DAVResource($request->path);
if ( ! $grantor->Exists() ) $request->DoResponse( 404 );
if ( ! $grantor->IsCollection() )
  $request->PreconditionFailed(403,'not-supported-privilege','ACLs are only supported on Principals or Collections');
 
$grantor->NeedPrivilege('write-acl');
 
$cache_delete_list = array();
 
$qry = new AwlQuery('BEGIN');
$qry->Exec('ACL',__LINE__,__FILE__);
 
function process_ace( $grantor, $by_principal, $by_collection, $ace ) {
  global $cache_delete_list, $request;
 
  $elements = $ace->GetContent();
  $principal_node = $elements[0];
  $grant = $elements[1];
  if ( $principal_node->GetNSTag() != 'DAV::principal' ) $request->MalformedRequest('ACL request must contain a principal, not '.$principal->GetNSTag());
  $grant_tag = $grant->GetNSTag();
  if ( $grant_tag == 'DAV::deny' )   $request->PreconditionFailed(403,'grant-only');
  if ( $grant_tag == 'DAV::invert' ) $request->PreconditionFailed(403,'no-invert');
  if ( $grant->GetNSTag() != 'DAV::grant' ) $request->MalformedRequest('ACL request must contain a principal for each ACE');
 
  $privilege_names = array();
  $xml_privs = $grant->GetPath("/DAV::grant/DAV::privilege/*");
  foreach( $xml_privs AS $k => $priv ) {
    $privilege_names[] = $priv->GetNSTag();
  }
  $privileges = privilege_to_bits($privilege_names);
 
  $principal_content = $principal_node->GetContent();
  if ( count($principal_content) != 1 ) $request->MalformedRequest('ACL request must contain exactly one principal per ACE');
  $principal_content = $principal_content[0];
 
  dbg_error_log( 'ACE', 'NSTag: "%s", by_collection: %s, by_principal: %s', $principal_content->GetNSTag(), $by_collection ?? 'Null', $by_principal ?? 'Null');
 
  switch( $principal_content->GetNSTag() ) {
    case 'DAV::property':
      $principal_property = $principal_content->GetContent();
      if ( $principal_property[0]->GetNSTag() != 'DAV::owner' ) $request->PreconditionFailed(403, 'recognized-principal' );
      if ( privilege_to_bits('all') != $privileges ) {
        $request->PreconditionFailed(403, 'no-protected-ace-conflict', 'Owner must always have all permissions' );
      }
      break;  // and then we ignore it, since it's protected
 
    case 'DAV::unauthenticated':
      $request->PreconditionFailed(403, 'allowed-principal', 'May not set privileges for unauthenticated users' );
      break;
 
    case 'DAV::href':
      $principal_type = 'href';
      $grantee = new DAVResource( DeconstructURL($principal_content->GetContent()) );
      $grantee_id = $grantee->getProperty('principal_id');
 
      if ( !$grantee->Exists() || !$grantee->IsPrincipal() )
        $request->PreconditionFailed(403,'recognized-principal', 'Principal "' . $principal_content->GetContent() . '" not found.');
 
      $sqlparms = array( ':to_principal' => $grantee_id);
      $where = 'WHERE to_principal=:to_principal AND ';
      if ( isset($by_principal) ) {
        $sqlparms[':by_principal'] = $by_principal;
        $where .= 'by_principal = :by_principal';
      }
      else {
        $sqlparms[':by_collection'] = $by_collection;
        $where .= 'by_collection = :by_collection';
      }
 
      $qry = new AwlQuery('SELECT privileges FROM grants '.$where, $sqlparms);
      if ( $qry->Exec('ACL',__LINE__,__FILE__) && $qry->rows() == 1 && $current = $qry->Fetch() ) {
        $sql = 'UPDATE grants SET privileges=:privileges::INT::BIT(24) '.$where;
      }
      else {
        $sqlparms[':by_principal'] = $by_principal;
        $sqlparms[':by_collection'] = $by_collection;
        $sql = 'INSERT INTO grants (by_principal, by_collection, to_principal, privileges) VALUES(:by_principal, :by_collection, :to_principal, :privileges::INT::BIT(24))';
      }
      $sqlparms[':privileges'] = $privileges;
      $qry = new AwlQuery($sql, $sqlparms);
      if ( $qry->Exec('ACL',__LINE__,__FILE__) ) {
        Principal::cacheDelete('dav_name',$grantee->dav_name());
        Principal::cacheFlush('principal_id IN (SELECT member_id FROM group_member WHERE group_id = ?)', array($grantee_id));
      }

      $cache = getCacheInstance();
      $cache->flush();
 
      #Principal::cacheFlush('TRUE');
 
      break;
 
    case 'DAV::authenticated':
      $principal_type = 'authenticated';
      $grant_default_privs = $grantor->GetProperty('default_privileges');
      if ( isset($grant_default_privs) && bindec($grant_default_privs) == $privileges ) break; // There is no change, so skip it
      $sqlparms = array( ':privileges' => $privileges );
      if ( isset($by_collection) ) {
        $sql = 'UPDATE collection SET default_privileges=:privileges::INT::BIT(24) WHERE collection_id=:by_collection';
        $sqlparms[':by_collection'] = $by_collection;
      }
      else {
        $sql = 'UPDATE principal SET default_privileges=:privileges::INT::BIT(24) WHERE principal_id=:by_principal';
        $sqlparms[':by_principal'] = $by_principal;
      }
      $qry = new AwlQuery($sql, $sqlparms);
      if ( $qry->Exec('ACL',__LINE__,__FILE__) ) {
        Principal::cacheFlush('TRUE');
      }
      break;
 
    case 'DAV::all':
//      $principal_type = 'all';
      $request->PreconditionFailed(403, 'allowed-principal', 'May not set privileges for unauthenticated users' );
      break;
 
    default:
      $request->PreconditionFailed(403, 'recognized-principal' );
      break;
  }
 
}
 
$by_principal  = ($grantor->IsPrincipal() ? $grantor->GetProperty('principal_id') : null);
$by_collection = ($grantor->IsPrincipal() ? null : $grantor->GetProperty('collection_id'));
 
foreach( $aces AS $k => $ace ) {
  process_ace($grantor, $by_principal, $by_collection, $ace);
}
 
$qry = new AwlQuery('COMMIT');
$qry->Exec('ACL',__LINE__,__FILE__);
 
 
$request->DoResponse( 200 );