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Facebook Connect PHP SDK Curl Peer SSL Verification Error

I'm integrating Facebook Connect into our application. I thought using Facebook Official SDK at http://github.com/facebook/php-sdk is the best way, as it is advertised on FB Developers wiki.

But I couldn't manage to make it work. When investigating the API code, I remembered my previous experiences about CURLOPT_SSL_VERIFYPEER parameter. This parameter has a default value of "true", and in the API it is not set, implicitly it is set as true.

I changed CURLOPT_SSL_VERIFYPEER parameter to false, and problem is solved. Using it as true, what I can get from Graph API for /get/me query was "boolean(false)" however setting it CURLOPT_SSL_VERIFYPEER parameter to false开发者_开发百科 same curl query gave me the user json object.

What I want to ask here is that, what are the side effects of using Facebook PHP SDK as "CURLOPT_SSL_VERIFYPEER" parameter is set to false. More generally, does it make sense if I init a curl session without peer verification.


Something is wrong with your PHP installation. Most likely, you don't have the ENTRUST intermediate cert needed to validate SSL certificate. This is their cert chain,

Certificate chain
 0 s:/C=US/ST=California/L=Palo Alto/O=Facebook, Inc./CN=*.facebook.com
   i:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert High Assurance CA-3
 1 s:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert High Assurance CA-3
   i:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert High Assurance EV Root CA
 2 s:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert High Assurance EV Root CA
   i:/C=US/O=Entrust.net/OU=www.entrust.net/CPS incorp. by ref. (limits liab.)/OU=(c) 1999 Entrust.net Limited/CN=Entrust.net Secure Server Certification Authority

Setting CURLOPT_SSL_VERIFYPEER to false simply disables certificate check. You shouldn't do that in production.


Try this, It solved the problem for me

Facebook::$CURL_OPTS[CURLOPT_SSL_VERIFYPEER] = false; Facebook::$CURL_OPTS[CURLOPT_SSL_VERIFYHOST] = 2;

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