secure your codeigniter application using csrf token _ sujit shah

2/21/2015 Secure Your CodeIgniter Application using CSRF Token | Sujit Shah

http://www.sks.com.np/secure-your-codeigniter-application-using-csrf-token/ 1/6

Suj i t ShahW e b D e v e l o p e r N e p a l

Secure Your CodeIgniter Application usingCSRF Token

October27,2014 byadmin inCodeIgniter

Inthistutorial,wewilllearnhowtomakeourwebsitemoresecure&protectfromCSRFwhenweareusingCodeIgniterwebapplicationframework.WethanksCodeIgniterteamwhogivinginbuiltsupportCrossSiteRquestForgery(CSRForXSRF).

ToenableCSRFprotectionCodeIgniterFrameworkwillautomaticallyprotectformsorAJAXcallsfromCSRFwhenweuseformhelperandincustomform,weneedtocallCSRFtokenname&itsvalueinhiddeninputfieldandsendwithPOSTrequests.

Enable CSRF in Config fileToenableCSRFprotectionweneedtomodifyconfigfileofCodeIgniterFramework.WejustneedtochangeTUREinsteadofFALSEinourapplication/config/config.phpfileforexample:$config['csrf_protection']=TRUE

AfterchangingourwebapplicationissecurewithCSRFprotection.ButifweusedcustomforminsteadofCodeIgniterformhelperthePOSTrequestwillfailandshowingfollowingerror:

ItmeansourCSRFprotectionisworking,andweneedtoupdatetheformstoaddaCSFRtokentothePOSTdata.

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Used CSRF Tokens using formhelper or ManuallyWehavetwowaytoaddCSRFtokensifwearethinkingtoupdateyourformwithCodeIgniterformhelperclassthenCSRFtokenswillautomaticaddedorifyouarethinkingtoadjustincustomformthenweneedtoaddcustomhiddeninputnameanditsvalue.

Whenwewilluseformhelperclass:

UsingformhelperclasswillautomaticallyaddedinputfiledintotheformwitharandomtokenvaluetopreventCSRF.

Output:

Whenweusecustomform:

WeneedtoaddainputfiledtopreventourcustomformwithCSRF.

Forexample:



How to use in AJAX/jQuery CallIfweareusingAJAXinourwebapplicationandtokenisnotpasswithPOSTdatathenCodeIgniterwillreturnaerror500(InternalServerError).ItmeanweneedtousedCSRFtokenalltheformsandpasswiththePOSTdata.TherearemanywaytopassCSRFtokenwithPOSTdataanditsdependsonyoubecausethereareformshelperclasswhichisautomaticallyaddedandcustomfieldwhereweneedtomanuallycodedandcallCSRFtokennameanditsrandomvalue.

ForExample:

varcsrf_token=''

$.post('POSTURL',{data:'value','csrf_test_name':

csrf_value},function(response){

//response

},'json')

How to use CSRF in AJAX/jQuerySerializationIfyouarethinktousedAJAXSerializationthenyouhaveveryeasyandjustopenandclosedyourformusingformhelperclassofCodeIgniter.

Forexample:

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$.post(ajax_url,$('#login).serialize(),function(response

){

//response

},'json')

Disable CSRF for Third Party APIWhenweareusingThirdPartyAPIorFacebookAPI/TwitterAPIinourwebsiteapplicationthenweneedtodisableCSRFprotectionintheresponsecontrollerorfunction(method).Forthisweneedtodisableourcontrollerorfunctiononly,

Forexample:

if(isset($_SERVER["REQUEST_URI"])){

if(stripos($_SERVER["REQUEST_URI"],'/ajax/')===

FALSEAND#allajaxcontrollers

stripos($_SERVER["REQUEST_URI"],'/facebook_app/)

===FALSEAND#allfacebookcontrollers

stripos($_SERVER["REQUEST_URI"],'/twitter_app/login')

===FALSEAND#onlyloginfunction

){

$config['csrf_protection']=TRUE

}else{

$config['csrf_protection']=FALSE

}

}else{

$config['csrf_protection']=TRUE

}

Tags: CodeIgniter CodeIgniterFramework CSRFinAJAX/jQuery

CSRFToken HowtouseCSRFToken? ThirdPartyAPI

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