SpamFerret.php

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Revision as of 18:39, 18 August 2010 by Woozle (talk | contribs) (2010-08-17 version)
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{{#lst:SpamFerret|navbar}}: SpamFerret.php

Code

<php><?php /* 

HISTORY:
 2007-08-19 (Wzl) fixed line 155 call to clsDatabase::Query() (method deprecated and removed)
 2007-09-30 (Wzl) fixing regex processing
 2007-10-11 (Wzl) logging ampersandbot attempts; spam throttle (automatic temporary blacklist)
 2007-10-13 (Wzl) fixed some issues which were preventing throttling from working - mainly changes to SQL
 2007-10-15 (Wzl) "Code" wasn't being recorded. Decided that normal filtering should use code '-' so NULL means something is wrong.
 2007-10-28 (Wzl) Events with THR and AMP codes *still* weren't being recorded because method call was improperly formatted.
 2007-12-23 (Wzl) Emails wikimaster if eregi() returns an error (due to improperly formatted regex)
 2007-12-26 (Wzl) Spam turd rejection / logging
 2007-12-27 (Wzl) Fixed spam turd detection to work for new pages too (will probably need refinement)
 2007-12-27 (Wzl) Ooops. Replaced missing if-block from regex results when inserted text is found.
 2008-08-29 (Wzl) Added permanent IP blocking
 2008-09-04 (Wzl) Added (optional) logging of successful edits
 2008-09-19 (Wzl) Actually *set* the "didEdit" flag for successful edits <facepalms>
 2008-10-21 (Wzl) Fixed minor syntax error in "defines"
 2009-02-25 (Wzl) $objArticleCurr->loadLastEdit() now causes error in MW 1.14 (was it necessary before?)
 2009-03-10 (Wzl) "require" -> "require_once" so other extensions can use data.php without conflict
   also optional $kfpWzlLibs so data.php can be somewhere not on the path
 2009-03-18 (Wzl) Got rid of shared.php requirement; now using kfpLib to locate data.php
 2009-03-26 (Wzl) Rewrote data library calls to use new classes (no longer using deprecated/removed classes)
   Also modified to use newer function hooks
 2009-04-24 (Wzl) fixed "strict" bug referencing unset $txtCurr when creating new page
 2009-07-05 (Wzl) Using LibMgr
 2009-07-14 (Wzl) Added attempts.Diff field, patterns.isDIff
 2009-07-15 (Wzl)
   On advice from FreeNode##php, changed from eregi() to preg_match()
   Added option to match diff results instead of submitted edit only
   Saves diff of each change, approved or not
   BUG: approved edits are not being logged properly; using "OK" code and logging as failed
 2009-07-26 (Wzl) fixed minor warning error on line 252
 2009-08-07 (Wzl) email notification working; removed TRD and AMP hard-coded offenses, to be redone as isDiff filters if needed
 2009-08-08 (Wzl) create client record immediately if client is not recognized; don't depend on spam filter being triggered
 2009-08-09 (Wzl) restructured "client" and "attempt" tables (was "clients", "attempts"); not backwards-compatible
 2010-02-24 (Wzl) some code-tidying; trying to restrict passing of data between methods to single array var in args/return
 2010-08-17 (Wzl) added some debug code to CheckRegex(); fixed problem with escaped chars in filter
TO DO:
 * Throttled save attempts should check for spam, just for data-gathering purposes.
   Possibly non-spam from a throttled IP should not update the "WhenLast" timestamp. Maybe this should be a LocalSettings option?
 * Figure out how to display a different error message than "the following text is what triggered our filter:"
OPTIONAL SETTINGS:
 kfpLib - path to data.php folder (no final slash)
 kfsLib_Data - filespec of data.php
  • /
  1. Loader for spam blacklist feature
  2. Include this from LocalSettings.php

if ( defined( 'MEDIAWIKI' ) ) {

$wgExtensionCredits['other'][] = array( 'name' => 'SpamFerret', 'author' => 'Woozle Staddon', 'url' => 'http://htyp.org/SpamFerret', 'version' => '2010-08-17', 'description' => 'database-driven wikispam blocker', ); if (!defined('kfsLib_Data')) { 

   if (defined('kfpLib')) {

define('kfsLib_Data', kfpLib.'/data.php'); 

   } else {

define('kfsLib_Data','data.php'); // assume it's on the path 

   }

} if (!defined('LIBMGR')) { 

   require('libmgr.php');

} clsLibMgr::Add('data', kfsLib_Data); clsLibMgr::Load('data');

/* ============== 

SET UP CALLBACKS
  • /

global $wgFilterCallback, $wgPreSpamFilterCallback;

$wgPreSpamFilterCallback = false; if ( defined( 'MW_SUPPORTS_EDITFILTERMERGED' ) ) { 

   $wgHooks['EditFilterMerged'][] = 'wfSpamFerretMerged';

} else { 

   if ( $wgFilterCallback ) {
       $wgPreSpamFilterCallback = $wgFilterCallback;
   }
   $wgFilterCallback = 'wfSpamFerretFilter';

}

/* $wgHooks['EditFilter'][] = 'wfSpamFerretValidate'; $wgHooks['ArticleSaveComplete'][] = 'wfSpamFerretArticleSave'; $wgHooks['APIEditBeforeSave'][] = 'wfSpamFerretAPIEditBeforeSave';

  • /

/* ================ 

SET GLOBAL OBJECTS
  • /

function GetSpamFerret() { 

   static $objFerret;

   if (!isset($objFerret)) {

$objFerret = new SpamFerret(); 

   }
   return $objFerret;

} /* ================ 

CALLBACK FUNCTIONS
  • /

/** 

* Hook function for $wgFilterCallback
*/

//function wfSpamFerretFilter( &$title, $text, $section, &$hookErr, $editSummary ) { function wfSpamFerretFilter( &$title, $text, $section ) { 

   global $wgOut;

   $spamObj = GetSpamFerret();
   $wgOut->addWikiText( "Intercepted by SpamFerretFilter" );

// $ret = $spamObj->filter( $title, $text, , $editSummary, $editPage ); 

   return $spamObj->filter( $title, $text, $section );

}

/** 

* Hook function for EditFilterMerged, replaces wfSpamBlacklistFilter
*/

function wfSpamFerretMerged( &$editPage, $text, &$hookErr, $editSummary ) { 

   global $wgTitle,$wgOut;

   if( is_null( $wgTitle ) ) {
       # API mode
       # wfSpamBlacklistFilterAPIEditBeforeSave already checked the blacklist
       return true;
   }

   $spamObj = GetSpamFerret();
   $title = $editPage->mArticle->getTitle();

// $ret = $spamObj->filter( $title, $text, , $editSummary, $editPage ); 

   $ret = $spamObj->filter( $title, $text, ,$editPage );
   if ( $ret !== false ) $editPage->spamPage( $ret );

// additional text can be added here: // $wgOut->addWikiText( "Intercepted by SpamFerretMerged" ); 

   // Return convention for hooks is the inverse of $wgFilterCallback
   return ( $ret === false );

} /** 

* Hook function for APIEditBeforeSave
*/

function wfSpamFerretAPIEditBeforeSave( &$editPage, $text, &$resultArr ) { }

class SpamFerret { 

   var $previousFilter = false;

// internal data 

   var $dbSpam;
   var $objDataClients;
   var $strIPAddr;
   var $idPattern;
   var $doClearThrottle;

   function Setting($iName) {

global $wgSpamFerretSettings;

return $wgSpamFerretSettings[$iName]; 

   }
   /*-----
     PROPERTIES USED: $this->idPattern (out)
   */
   function filter( &$title, $text, $section,  $editPage = FALSE ) {

global $wgArticle, $wgDBname, $wgMemc, $messageMemc, $wgVersion, $wgOut; global $wgTitle, $wgServer; global $debug; global $errNum, $errStr; global $gErrorText; // debugging: global $sql;

$fname = 'wfSpamFerretFilter'; wfProfileIn( $fname );

ini_set('track_errors', 1);

# Call the rest of the hook chain first if ( $this->previousFilter ) { $f = $this->previousFilter; if ( $f( $title, $text, $section ) ) { wfProfileOut( $fname ); return true; } } // initialize variables $retVal = FALSE; // default = assume edit is ok $gErrorText = FALSE; $isClientKnown = FALSE;

$this->txtEditRaw = $text; // DEPRECATED $arArgs['edit-raw'] = $text;

// get the IP address of the http client making the edit attempt: $this->strIPAddr = wfGetIP(); // Open the database $this->OpenDatabase(); // open clients table (extended Throttle version) for reference: //return TRUE; $objTblClients = new clsTable($this->dbSpam); $objTblClients->Name('ClientThrottle2'); $objTblClients->KeyName('Address'); // Look up to see if this IP is known; it may already be throttled: $this->objDataClients = $objTblClients->GetData('Address="'.$this->strIPAddr.'"'); if (is_object($this->objDataClients)) { if ($this->objDataClients->hasRows()) { $isClientKnown = TRUE; } } if ($isClientKnown) { $this->objDataClients->FirstRow(); $doBlock = $this->objDataClients->doBlock; if ($doBlock) { $strThrType = 'BLK'; } else { $intRetries = $this->objDataClients->Retries; $intThrottle = $this->Setting('throttle_retries'); $doBlock = $intRetries > $intThrottle; $strThrType = 'THR-'.$intRetries; } if ($doBlock) { $arArgs['diff'] = NULL; // not applicable // retry limit exceeded; check timeout limit if ($this->objDataClients->ThrottleTime < $this->Setting('throttle_timeout')) { $txtMsg = 'Too many spam attempts from your IP address ('.$this->strIPAddr.'). Please come back later.'; if ($editPage) { $editPage->spamPage($txtMsg); } else { EditPage::spamPage($txtMsg); // older MW code doesn't supply $editPage } $arArgs['code'] = $strThrType; $this->RecordAttempt($arArgs); // record post attempt by throttled client $retVal = true; // client has exceeded spam limit; impose throttle } else { $this->doClearThrottle = true; } } } else { $this->CreateClient(); } //$this->txtDiff = 'N/A'; $arArgs['diff'] = 'N/A'; if (!$retVal) { $arRtn = $this->GetDiff($title); // get the diff between edit and current contents $arArgs['diff'] = $arRtn['diff']; $arArgs['doAll'] = FALSE; $arRtn = $this->CheckFilters($arArgs); $arArgs['edit-to-check'] = $arRtn['edit-to-check']; if ( $this->isMatch ) { // spam cue found; display the matching text and don't allow the edit to be saved: wfDebug( "Match!\n" );

// The string sent to spamPage() will be shown after "The following text is what triggered our spam filter:" $retVal = '(pattern #'.$this->idPattern.') '.$this->strMatch; // Log the spam attempt: $arArgs['code'] = '-'; $this->RecordAttempt($arArgs); } else { // no spam cues found; allow the edit to be saved, if nothing else has tripped the filter //if ($this->Setting('log_ok_edits')) { $this->idPattern = NULL; $this->RecordOkEdit($arArgs); //$this->RecordAttempt('OK'); //} } } wfProfileOut( $fname ); $this->ReportErrors(); //$wgOut->addHTML($out); return $retVal; /**/ 

   }
   public function OpenDatabase() {

$this->dbSpam = new clsDatabase($this->Setting('dbspec')); $this->dbSpam->Open(); 

   }
   public function FiltTbl() {

$doLoad = TRUE; $doLoad = empty($this->objFilts); if ($doLoad) { $objTbl = new clsTable($this->dbSpam); $objTbl->Name('patterns'); $objTbl->KeyName('ID'); $this->objFilts = $objTbl; } return $this->objFilts; 

   }
   /*-----
     INPUT:

$iTitle - page for comparing proposed edit $this->txtEditRaw (DEPRECATED; use $iarArgs['text-to-check'] 

     OUTPUT:

return ['diff'] 

   */
   public function GetDiff($iTitle) {

$objArticleCurr = new Article($iTitle); if ($objArticleCurr->exists()) { $txtCurr = $objArticleCurr->getContent(); $txtDiff = FigureDiff($txtCurr,$this->txtEditRaw); } else { $txtDiff = '!!NEW: '.$this->txtEditRaw; } //$this->txtDiff = $txtDiff; $arOut['diff'] = $txtDiff; return $arOut; 

   }
   /*-----
     INPUT:

$iarArgs['doAll'] $iarArgs['diff'] $this->txtEditRaw - DEPRECATED; use $iarArgs 

     OUTPUT:

$this->idPattern 

   */
   public function CheckFilters(array $iarArgs) {

global $gRegexMatches,$gFilterMatches,$gFilterRows,$gFilterCount; global $debug;

assert('is_object($this->dbSpam)');

$doCheckAll = $iarArgs['doAll']; $strChkDiff = strtolower(nz($iarArgs['diff'])); $objFiltTbl = $this->FiltTbl();

if ($doCheckAll) { $sqlFilt = NULL; } else { $sqlFilt = 'isActive'; }

$objFiltRows = $objFiltTbl->GetData($sqlFilt); $objRow = $objFiltRows; // for shorthand

$strTextEdit = strtolower($this->txtEditRaw); //$this->txtEditChk = $strTextEdit; // text after being massaged for checking $arOut['edit-to-check'] = $strTextEdit; // text after being massaged for checking $this->isMatch = FALSE; $gFilterCount = 0; $gFilterRows = $objRow->RowCount(); while($objRow->NextRow() && (!$this->isMatch || $doCheckAll)) { $isMatch = FALSE; if ($objRow->isDiff) { $strTextCk = $strChkDiff; } else { $strTextCk = $strTextEdit; } if (!is_null($strTextCk)) { $gFilterCount++; $strPattern = strtolower($objRow->Pattern); $isRegex = $objRow->isRegex; $this->idPattern = $objRow->ID; if ($isRegex) { $isMatch = $this->CheckRegex($strPattern,$strTextCk); if (isset($php_errormsg)) { $this->AddErrorLine('Filter #'.$this->idPattern.' generated error "'.$php_errormsg); }

if ($isMatch) { $this->strMatch = $gRegexMatches[0]; } } else { if (empty($strPattern)) { $isMatch = FALSE; } else { $this->strMatch = stristr($strTextCk,$strPattern); $isMatch = ($this->strMatch != ); } } if ($isMatch) { $this->isMatch = TRUE; if ($doCheckAll) { $gFilterMatches[$this->idPattern] = $this->strMatch; } } } } 

   }
   /*
     TO DO:

replace $gRegexMatches with return array make this function static 

   */
   public function CheckRegex($iPattern,$iText) {

global $gRegexMatches,$strDbg;

$chDelim = '/'; $strPattCk = $iPattern; // (2010-08-17) this next line causes incorrect handling of escaped characters in the filter //$strPattCk = str_replace('\\','\\\\',$strPattCk); // make sure filter backslashes are prefixed to be literal $strPattCk = str_replace($chDelim,'\\'.$chDelim,$strPattCk); unset($php_errormsg); // TO DO: explain this $strFinal = $chDelim.$strPattCk.$chDelim; $strDbg .= "@preg_match(\"$strFinal\",\"$iText\",...)"; $isMatch = @preg_match($strFinal,$iText,$gRegexMatches); return $isMatch; 

   }

   public function AddErrorLine($iText) {

global $gErrorText;

$gErrorText .= $iText."\n"; 

   }
   public function ReportErrors() {

global $wgUser; global $wgEmergencyContact; global $gErrorText;

if ($gErrorText) { $msgEmail = 'Filter error report for user '.$wgUser->getName().":\n\n"; $msgEmail .= $gErrorText; mail($wgEmergencyContact,'spamferret filter error',$msgEmail); } 

   }

/* 

ACTION: Create a new record for the current client
  • /

public function CreateClient() { $sql = 'INSERT INTO client (Address,WhenFirst,Count,Retries) VALUES("'.$this->strIPAddr.'",NOW(),1,0)'; $this->dbSpam->Exec($sql); } /* 

ACTION: Update a client's record to reflect a new spam attempt
  • /

public function RecordClientSpam() { if ($this->doClearThrottle) { $strRetries = '0'; } else { $strRetries = 'Retries+1'; } $sql = 'UPDATE client SET WhenLast=NOW(),Count=Count+1, Retries='.$strRetries.' WHERE Address="'.$this->strIPAddr.'"'; $this->dbSpam->Exec($sql); if ($this->dbSpam->RowsAffected() < 1) { $this->CreateClient(); $this->AddErrorLine('Record not found for client '.$this->strIPAddr); } } /*----- INPUT: $this->idPattern $iarArgs['edit-raw'] */ public function RecordAttempt(array $iarArgs) { global $wgTitle, $wgServer;

$iCode = $iarArgs['code']; $txtDiff = $iarArgs['diff']; // was $this->txtDiff $txtEdit = $iarArgs['edit-raw']; // was $this->txtEditChk $this->RecordClientSpam();

$sqlCode = '"'.$iCode.'"'; $sqlURL = '"'.$this->dbSpam->SafeParam($wgTitle->getFullURL()).'"'; $sqlSrvr = '"'.$this->dbSpam->SafeParam($wgServer).'"'; $sqlPage = '"'.$this->dbSpam->SafeParam($wgTitle->getPrefixedText()).'"'; $sqlEdit = '"'.$this->dbSpam->SafeParam($txtEdit).'"'; $sqlDiff = '"'.$this->dbSpam->SafeParam($txtDiff).'"'; $sqlPattern = $this->idPattern; if (is_null($sqlPattern)) { $sqlPattern = 'NULL'; $isPattern = FALSE; } else { $isPattern = TRUE; } $sqlAddr = '"'.$this->strIPAddr.'"'; //$sqlMatch = is_null($iMatch)?'NULL':'"'.$iMatch.'"'; $sql = 'INSERT INTO attempt (`When`,ID_Pattern,Addr_Client,IDS_Session,PageServer,PageName,Code,didAllow,Edit,Diff) VALUES' .'(NOW(),' .$sqlPattern.',' .$sqlAddr.',' .SQL_Value(session_id()).',' .$sqlSrvr.',' .$sqlPage.',' .$sqlCode.',' .'FALSE,' .$sqlEdit.',' .$sqlDiff.')'; $ok = $this->dbSpam->Exec($sql); if ($ok !== TRUE) { $this->AddErrorLine('SQL ['.$sql.'] in RecordAttempt() generated this error: '.$ok); } if ($isPattern) { $sql = 'UPDATE patterns SET WhenTried=NOW(), Count=Count+1 WHERE ID='.$this->idPattern; $ok = $this->dbSpam->Exec($sql); if ($ok !== TRUE) { $this->AddErrorLine('SQL ['.$sql.'] generated this error: '.$ok); } } } /* INPUT: $this->txtEditChk */ public function RecordOkEdit(array $iarArgs) { global $wgTitle, $wgServer;

$txtDiff = $iarArgs['diff']; // was $this->txtDiff $txtEdit = $iarArgs['edit-to-check']; // was $this->txtEditChk

$sqlPage = '"'.$this->dbSpam->SafeParam($wgTitle->getPrefixedText()).'"'; $sqlSrvr = '"'.$this->dbSpam->SafeParam($wgServer).'"'; $sqlEdit = '"'.$this->dbSpam->SafeParam($txtEdit).'"'; $sqlDiff = '"'.$this->dbSpam->SafeParam($txtDiff).'"'; $sql = 'INSERT INTO attempt (`When`,ID_Pattern,Addr_Client,IDS_Session,PageServer,PageName,Code,didAllow,Edit,Diff) VALUES ' .'(NOW(),NULL,' .'"'.$this->strIPAddr.'",' .SQL_Value(session_id()).',' .$sqlSrvr.',' .$sqlPage.',"ok",TRUE,' .$sqlEdit.',' .$sqlDiff.')'; $ok = $this->dbSpam->Exec($sql); if ($ok !== TRUE) { $this->AddErrorLine('SQL ['.$sql.'] in RecordOkEdit() generated this error: '.$ok); } } }

function ErrorHandler ($errno ,$errstr) { global $errNum, $errStr;

$errNum = $errno; $errStr = $errstr; }

function SQL_Value($iVar) { if (is_null($iVar)) { return 'NULL'; } else { if (is_numeric($iVar)) { return $iVar; } else { return '"'.$iVar.'"'; } } } function FigureDiff($iTextOld, $iTextNew) { # Make temporary files // $td = wfTempDir(); $td = session_save_path(); $fhOld = fopen( $fnOld = tempnam( $td, 'SpamFerret-old-' ), 'w' ); $fhNew = fopen( $fnNew = tempnam( $td, 'SpamFerret-new-' ), 'w' );

fwrite( $fhOld, $iTextOld ); fclose( $fhOld ); fwrite( $fhNew, $iTextNew ); fclose( $fhNew );

$ksSpamFerretDiffOptions = '-i -E --suppress-common-lines '; // this setting applies to all uses of a given filter DB // can change for different DBs $cmd = 'diff '.$ksSpamFerretDiffOptions.wfEscapeShellArg( $fnOld, $fnNew ); $handle = popen( $cmd, 'r' ); $result = ; do { $data = fread( $handle, 8192 ); if ( strlen( $data ) == 0 ) { break; } $result .= $data; } while ( true ); pclose( $handle ); unlink( $fnNew ); unlink( $fnOld ); //return 'cmd=['.$cmd.'] diff=['.$result.']'; return $result; }

} // end of 'MEDIAWIKI' check

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