ios - 如何在 iOS 中验证(和要求)自签名证书

Question

我想使用 iOS 代码附带的自签名证书与我的服务器建立 SSL 连接。这样我就不必担心有人可以访问高级“受信任”证书颁发机构的更复杂的中间人攻击。我在使用我认为是 Apple 的标准方式时遇到了问题。

通过找到的过程生成证书 here

# Create root CA & private key
openssl req -newkey rsa:4096 -sha512 -days 9999 -x509 -nodes -out root.pem.cer
# Create a certificate signing request
openssl req -newkey rsa:4096 -sha512 -nodes -out ssl.csr -keyout ssl.key
# Create an OpenSSL Configuration file from http://svasey.org/projects/software-usage-notes/ssl_en.html
vim openssl.conf
# Create the indexes
touch certindex
echo 000a > certserial
echo 000a > crlnumber
# Generate SSL certificate 
openssl ca -batch -config openssl.conf -notext -in ssl.csr -out ssl.pem.cer
# Create Certificate Revocation List
openssl ca -config openssl.conf -gencrl -keyfile privkey.pem -cert root.pem.cer -out root.crl.pem
openssl crl -inform PEM -in root.crl.pem -outform DER -out root.crl && rm root.crl.pem

iOS 代码:

- (void)connection:(NSURLConnection *)connection willSendRequestForAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge {
  NSURLProtectionSpace *protectionSpace = [challenge protectionSpace];
  if ([protectionSpace authenticationMethod] == NSURLAuthenticationMethodServerTrust) {
    // Load anchor cert.. also tried this with both certs and it doesn't seem to matter
    NSString *path = [[NSBundle mainBundle] pathForResource:@"root.der" ofType:@"crt"];
    NSData *data = [[NSData alloc] initWithContentsOfFile:path];
    SecCertificateRef anchorCert = SecCertificateCreateWithData(kCFAllocatorDefault, (__bridge CFDataRef)data);
    CFMutableArrayRef anchorCerts = CFArrayCreateMutable(kCFAllocatorDefault, 0, &kCFTypeArrayCallBacks);
    CFArrayAppendValue(anchorCerts, anchorCert);

    // Set anchor cert
    SecTrustRef trust = [protectionSpace serverTrust];
    SecTrustSetAnchorCertificates(trust, anchorCerts);
    SecTrustSetAnchorCertificatesOnly(trust, YES); // only use that certificate
    CFRelease(anchorCert);
    CFRelease(anchorCerts);

    // Validate cert
    SecTrustResultType secresult = kSecTrustResultInvalid;
    if (SecTrustEvaluate(trust, &secresult) != errSecSuccess) {
      [challenge.sender cancelAuthenticationChallenge:challenge];
      return;
    }

    switch (secresult) {
      case kSecTrustResultInvalid:
      case kSecTrustResultDeny:
      case kSecTrustResultFatalTrustFailure:
      case kSecTrustResultOtherError:
      case kSecTrustResultRecoverableTrustFailure: { 
        // !!! It's always kSecTrustResultRecoverableTrustFailure, aka 5
        NSLog(@"Failing due to result: %lu", secresult);
        [challenge.sender cancelAuthenticationChallenge:challenge];
        return;
      }

      case kSecTrustResultUnspecified: // The OS trusts this certificate implicitly.
      case kSecTrustResultProceed: { // The user explicitly told the OS to trust it.
        NSURLCredential *credential = [NSURLCredential credentialForTrust:trust];
        [challenge.sender useCredential:credential forAuthenticationChallenge:challenge];
        return;
      }
      default: ;
        /* It's somebody else's key. Fall through. */
    }
    /* The server sent a key other than the trusted key. */
    [connection cancel];

    // Perform other cleanup here, as needed.
  } else {
    NSLog(@"In weird space... not handling authentication method: %@", [protectionSpace authenticationMethod]);
    [connection cancel];
  }
}

我总是得到 kSecTrustResultRecoverableTrustFailure 作为结果。我不认为这是本地主机问题，因为我也尝试过使用 Apple 的代码来更改它。怎么办？

谢谢!

Answer 1

如果信任结果是kSecTrustResultRecoverableTrustFailure，您可能能够从失败中恢复。

这是解决方法。

https://developer.apple.com/library/mac/#documentation/security/conceptual/CertKeyTrustProgGuide/iPhone_Tasks/iPhone_Tasks.html#//apple_ref/doc/uid/TP40001358-CH208-SW8