Question

我使用SSL渠道消费webservices相当新。经过相当不错的搜索后，我找到了一种使用NSURLConnection委托API执行SSL / HTTPS身份验证的方法。以下是执行实际身份验证的代码段：

- (void)connection:(NSURLConnection *)connection willSendRequestForAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge {
[self printLogToConsole:@"Authenticating...."];
[self printLogToConsole:[NSString stringWithFormat:@"\n%@\n", [challenge description]]];
NSLog(@"\n\nserverTrust: %@\n", [[challenge protectionSpace] serverTrust]);

/* Extract the server certificate for trust validation
 */
NSURLProtectionSpace *protectionSpace = [challenge protectionSpace];
assert(protectionSpace);
SecTrustRef trust = [protectionSpace serverTrust];    
assert(trust);
CFRetain(trust); // Make sure this thing stays around until we're done with it
NSURLCredential *credential = [NSURLCredential credentialForTrust:trust];


/* On iOS 
 * we need to convert it to 'der' certificate. It can be done easily through Terminal as follows:
 * $ openssl x509 -in certificate.pem -outform der -out rootcert.der
 */
NSString *path = [[NSBundle mainBundle] pathForResource:@"rootcert" ofType:@"der"];
assert(path);
NSData *data = [NSData dataWithContentsOfFile:path];
assert(data);

/* Set up the array of certificates, we will authenticate against and create credentials */
SecCertificateRef rtCertificate = SecCertificateCreateWithData(NULL, CFBridgingRetain(data));
const void *array[1] = { rtCertificate };
trustedCerts = CFArrayCreate(NULL, array, 1, &kCFTypeArrayCallBacks);
CFRelease(rtCertificate); // for completeness, really does not matter

/* Build up the trust anchor using our root cert */
int err;
SecTrustResultType trustResult = 0;
err = SecTrustSetAnchorCertificates(trust, trustedCerts);
if (err == noErr) {
    err = SecTrustEvaluate(trust, &trustResult);
}
CFRelease(trust); // OK, now we're done with it

[self printLogToConsole:[NSString stringWithFormat:@"trustResult: %d\n", trustResult]];

/* http://developer.apple.com/library/mac/#qa/qa1360/_index.html
 */
BOOL trusted = (err == noErr) && ((trustResult == kSecTrustResultProceed) || (trustResult == kSecTrustResultConfirm) || (trustResult == kSecTrustResultUnspecified));

// Return based on whether we decided to trust or not
if (trusted) {
    [[challenge sender] useCredential:credential forAuthenticationChallenge:challenge];
    [self printLogToConsole:@"Success! Trust validation successful."];
} else {
    [self printLogToConsole:@"Failed! Trust evaluation failed for service root certificate.\n"];
    [[challenge sender] cancelAuthenticationChallenge:challenge];
}

}

但我收到以下错误：

2012-06-11 17:10:12.541 SecureLogin[3424:f803] Error during connection: Error Domain=NSURLErrorDomain Code=-1012 "The operation couldn’t be completed. (NSURLErrorDomain error -1012.)" UserInfo=0x682c790 {NSErrorFailingURLKey=https://staging.esecure.url/authentication/signin/merchants, NSErrorFailingURLStringKey=https://staging.esecure.url/authentication/signin/merchants}

我使用的是与服务器相同的证书并将其转换为'der'格式。我正在为iOS 5.x构建应用程序。我不确定我是否错过了什么。让我知道你的建议。

感谢。

修改在此处检查证书之后输出的外观如何： Portecle app Examination

如果出现问题，请告诉我。

感谢。

Answer 1

我无法确定您的代码是否有效，因为我使用RestKit来使用REST接口，但导致NSURLErrorDomain Code=-1012的最常见问题是自签名证书没有subject alternative name如果地址，则指向Web服务的扩展名。

要检查您的证书，请下载Portecle app，如果您需要查看ssl证书，这非常有用。运行它并从菜单中选择Examine-＆gt; Examine Certificate并导航到您的证书。您将看到有关证书的基本信息，现在按下“检查”按钮，然后按“主题备用名称”，并确保您的Web服务的IP地址正确。如果没有，您需要使用此信息再次创建证书。

Answer 2

我确实知道如何解决这个问题。

我最终逐字节地比较了客户端和服务器信任证书。虽然可能有另一种方法来解决自签名证书的问题，但是对于这个解决方案确实有效。下面是我如何使用他们的CFData对象逐个字节地比较客户端和服务器证书（您还可以参考Apple提供的'AdvancedURLConnections'示例代码）：

success = NO;
        pServerCert = SecTrustGetLeafCertificate(trust);
        if (clientCert != NULL) {
            CFDataRef       clientCertData;
            CFDataRef       serverCertData;

            clientCertData = SecCertificateCopyData(clientCert);
            serverCertData   = SecCertificateCopyData(pServerCert);

            assert(clientCertData != NULL);
            assert(serverCertData   != NULL);

            success = CFEqual(clientCertData, serverCertData);

            CFRelease(clientCertData);
            CFRelease(serverCertData);
        }
        if (success) {
            [[challenge sender] useCredential:credential forAuthenticationChallenge:challenge];
            [self printLogToConsole:@"Success! Trust validation successful."];
        } else {
            [self printLogToConsole:@"Failed! Trust evaluation failed for service root certificate.\n"];
            [[challenge sender] cancelAuthenticationChallenge:challenge];
        }

希望这能帮助正在寻找类似问题解决方案的人，

感谢。

iOS和SSL：无法验证自签名服务器证书

2 个答案: