检查 canAuthenticateAgainstProtectionSpace 中的公钥

Question

我被要求根据 canAuthenticateAgainstProtectionSpace 中的已知值检查公钥（NSURLConnection ）

这就是我到目前为止所拥有的：

- (BOOL)connection:(NSURLConnection *)connection 
        canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace 
    {
        SecKeyRef publicKey = SecTrustCopyPublicKey([protectionSpace serverTrust]);

        NSLog(@"%@",SecTrustCopyPublicKey([protectionSpace serverTrust])); 
        return YES;
}

How can I Compare the public key against已知值？

NSLog 生成：，这并不是很有用。

Answer 1

如果有人关心的话，解决方案是使用捆绑包中保存的证书逐字节检查证书。

- (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;
}

Answer 2

请注意，SecCertificateCopyData 以“DER”形式（可区分编码规则）返回证书。因此，您需要以这种形式将证书合并到您的应用程序中，而不是作为 pem 或任何格式。要使用 openssl 将证书转换为 DER，请使用以下命令： openssl x509 -in server.crt -out server.der -outform DER