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//
// ISPPinnedNSURLSessionDelegate.m
// SSLCertificatePinning
//
// Created by Alban Diquet on 1/14/14.
// Copyright (c) 2014 iSEC Partners. All rights reserved.
//
#import <Foundation/NSURLSession.h>
#import "ISPPinnedNSURLSessionDelegate.h"
#import "ISPCertificatePinning.h"
@implementation ISPPinnedNSURLSessionDelegate
- (void)URLSession:(NSURLSession *)session didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *credential))completionHandler {
if([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]) {
SecTrustRef serverTrust = [[challenge protectionSpace] serverTrust];
NSString *domain = [[challenge protectionSpace] host];
SecTrustResultType trustResult;
// Validate the certificate chain with the device's trust store anyway
// This *might* give use revocation checking
SecTrustEvaluate(serverTrust, &trustResult);
if (trustResult == kSecTrustResultUnspecified) {
// Look for a pinned certificate in the server's certificate chain
if ([ISPCertificatePinning verifyPinnedCertificateForTrust:serverTrust andDomain:domain]) {
// Found the certificate; continue connecting
completionHandler(NSURLSessionAuthChallengeUseCredential, [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust]);
}
else {
// The certificate wasn't found in the certificate chain; cancel the connection
completionHandler(NSURLSessionAuthChallengeCancelAuthenticationChallenge, [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust]);
}
}
else {
// Certificate chain validation failed; cancel the connection
completionHandler(NSURLSessionAuthChallengeCancelAuthenticationChallenge, [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust]);
}
}
}
@end
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