iOS : NSInputStream / NSOutputStream - CFNetwork SSLHandshak

Question

我正在尝试打开到安全服务器的输入/输出流，但不断得到 CFNetwork SSLHandshake失败(-9806(

我已经为异常域等设置了 plist 值

<key>NSAppTransportSecurity</key>
<dict>
    <key>NSExceptionDomains</key>
    <dict>
        <key>someserver.com</key>
        <dict>
            <key>NSIncludesSubdomains</key>
            <true/>
            <key>NSThirdPartyExceptionMinimumTLSVersion</key>
            <string>TLSv1.0</string>
            <key>NSThirdPartyExceptionRequiresForwardSecrecy</key>
            <false/>
            <key>NSTemporaryExceptionAllowsInsecureHTTPLoads</key>
            <true/>
        </dict>
    </dict>
</dict>

我也在 plist 中尝试过这个：

<key>NSAppTransportSecurity</key>
<dict>
    <key>NSAllowsArbitraryLoads</key>
    <true/>
</dict>

这是我的代码：

-(void)startStream{

NSString *urlStr = @"https://stream.someserver.com";
NSURL *website = [NSURL URLWithString:urlStr];

CFReadStreamRef readStream;
CFWriteStreamRef writeStream;
CFStreamCreatePairWithSocketToHost(NULL, (CFStringRef)CFBridgingRetain([website host]), 443, &readStream, &writeStream);
NSInputStream *inputStream = (__bridge_transfer NSInputStream *)readStream;
NSOutputStream *outputStream = (__bridge_transfer NSOutputStream *)writeStream;

[inputStream setDelegate:self];
[outputStream setDelegate:self];
[inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];

NSMutableDictionary *settings = [NSMutableDictionary dictionaryWithCapacity:1];
[settings setObject:(NSString *)NSStreamSocketSecurityLevelTLSv1 forKey:(NSString *)kCFStreamSSLLevel];
[settings setObject:[NSNumber numberWithBool:YES] forKey:(NSString *)kCFStreamSSLValidatesCertificateChain];
[settings setObject:@"stream.someserver.com" forKey:(NSString *)kCFStreamSSLPeerName];
CFWriteStreamSetProperty((CFWriteStreamRef)outputStream, kCFStreamPropertySSLSettings, (CFTypeRef)settings);
CFReadStreamSetProperty((CFReadStreamRef)inputStream, kCFStreamPropertySSLSettings, (CFTypeRef)settings);

[inputStream open];
[outputStream open];
}

在流打开后，在抛出 CFNetwork SSLHandshake 失败 (-9806( 错误之前，会有大约 5 秒的延迟。

注意：安全服务器不是我的，我无法更改那里的任何设置。它是一个经过测试和建立的服务器，有许多用户流式传输

Answer 1

我不确定哪个阶段在 ssl 连接握手中失败，但您可以尝试将设置字典更改为如下所示：

 NSDictionary *settings = [[NSDictionary alloc] initWithObjectsAndKeys:
                          [NSNumber numberWithBool:YES], kCFStreamSSLAllowsExpiredCertificates,
                          [NSNumber numberWithBool:YES], kCFStreamSSLAllowsAnyRoot,
                          [NSNumber numberWithBool:YES], kCFStreamSSLAllowsExpiredRoots,
                          [NSNumber numberWithBool:NO], kCFStreamSSLValidatesCertificateChain,
                          //kCFNull,kCFStreamSSLPeerName,
                          kCFStreamSocketSecurityLevelSSLv3, kCFStreamSSLLevel,
                          [NSNumber numberWithBool:YES], kCFStreamPropertyShouldCloseNativeSocket,
                          nil];

然后，如果成功，请删除上面定义的每个"安全漏洞"。

Answer 2

查看Apple文档，您似乎使用了错误的键。

例如

• NSThirdPartyExceptionMinimumTLSVersion必须NSExceptionMinimumTLSVersion
• NSTemporaryExceptionAllowsInsecureHTTPLoads必须NSExceptionAllowsInsecureHTTPLoads
• 和ECC...

Answer 3

在 SSL 设置中，将kCFStreamSSLValidatesCertificateChain设置为 @NO 以完全禁用服务器信任评估。

在委托实现中，首次获取NSStreamEventHasSpaceAvailable或NSStreamEventHasBytesAvailable状态时，从流中检索 kCFStreamPropertySSLPeerTrust 属性。

您应该返回一个SecTrustRef，您可以评估并获取有关以下内容的信息：

SecTrustRef trust = (SecTrustRef)[stream propertyForKey:kCFStreamPropertySSLPeerTrust];
SecTrustResultType trustResult;
OSStatus status = SecTrustEvaluate(trust, &trustResult);
if (status != errSecSuccess) {
    NSLog(@"failed to evaluate");
} else {
    OSStatus trustResultCode = SecTrustGetTrustResult(trust, &trustResult);
}

最后的trustResultCode应该给出信任评估失败的具体原因。根据具体原因，您可以修改SecTrustRef或创建一个全新的以获得成功的评估。

Apple Tech Note HTTPS Server Trust Evaluation非常翔实。