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Check SSL server certificate in App

How to check SSL server certificate in App to avoid man-in-the-middle attacks.


- (BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace 
{
    SecTrustRef trust = [protectionSpace serverTrust];


    SecCertificateRef certificate = SecTrustGetCertificateAtIndex(trust, 0);


    NSData* ServerCertificateData = (NSData*) SecCertificateCopyData(certificate);


    // Check if the certificate returned from the server is identical to the saved certificate in
    // the main bundle
    BOOL areCertificatesEqual = ([ServerCertificateData 
                                  isEqualToData:[MyClass getCertificate]]);


    [ServerCertificateData release];


    if (!areCertificatesEqual) 
    {    
        NSLog(@"Bad Certificate, canceling request");
        [connection cancel];
    }


    // If the certificates are not equal we should not talk to the server;
    return areCertificatesEqual;
}


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