ios - NSURLSession + 带有自签名证书的服务器

Question

我有一个生产应用程序以及一个具有自签名证书的开发服务器。

我正在尝试测试 NSURLSession 和后台下载，但似乎无法通过 - (void)URLSession:(NSURLSession *)session didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler: (void (^)(NSURLSessionAuthChallengeDisposition 处置, NSURLCredential *credential))completionHandler

当我使用 NSURLConnection 时，我可以使用以下方法绕过它:

- (BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace {

    NSLog(@"canAuthenticateAgainstProtectionSpace %@", [protectionSpace authenticationMethod]);

    return [protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust];
}

- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge {

    NSLog(@"didReceiveAuthenticationChallenge %@ %zd", [[challenge protectionSpace] authenticationMethod], (ssize_t) [challenge previousFailureCount]);

    [challenge.sender useCredential:[NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust] forAuthenticationChallenge:challenge];
}

但我不知道如何让它与 NSURLSession 一起工作 >:(

这是我目前拥有的(不起作用):

- (void)URLSession:(NSURLSession *)session didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *credential))completionHandler {
    NSLog(@"NSURLSession did receive challenge.");

    completionHandler(NSURLSessionAuthChallengeUseCredential, [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust]);
}

我还尝试创建一个 NSURLSession 类别，它允许主机使用任何证书:

#import "NSURLRequest+IgnoreSSL.h"

@implementation NSURLRequest (IgnoreSSL)

+ (BOOL)allowsAnyHTTPSCertificateForHost:(NSString*)host {
    return YES;
}

+ (void)setAllowsAnyHTTPSCertificate:(BOOL)allow forHost:(NSString*)host {}

@end

这似乎也没有帮助。

---

编辑

我已更新此方法以返回:

- (void)URLSession:(NSURLSession *)session didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *credential))completionHandler {

    //Creates credentials for logged in user (username/pass)
    NSURLCredential *cred = [[AuthController sharedController] userCredentials];

    completionHandler(NSURLSessionAuthChallengeUseCredential, cred);

}

仍然什么都不做。

Answer 1

对我来说，您的第一个示例运行良好。我已经使用以下代码进行了测试，没有出现任何问题(这当然是非常不安全的，因为它允许任何服务器证书)。

@implementation SessionTest

- (void) startSession
{
    NSURL *url = [NSURL URLWithString:@"https://self-signed.server.url"];

    NSURLSessionConfiguration *defaultConfigObject = [NSURLSessionConfiguration defaultSessionConfiguration];
    NSURLSession *defaultSession = [NSURLSession sessionWithConfiguration: defaultConfigObject delegate: self delegateQueue: [NSOperationQueue mainQueue]];

    NSURLSessionDataTask * dataTask = [defaultSession dataTaskWithURL:url
                                                completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
                                                    if(error == nil)
                                                    {
                                                        NSString * text = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding];
                                                        NSLog(@"Data: %@",text);
                                                    }
                                                    else
                                                    {
                                                        NSLog(@"Error: %@", error);
                                                    }
                                                }];

    [dataTask resume];
}

- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *credential))completionHandler
{
    completionHandler(NSURLSessionAuthChallengeUseCredential, [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust]);
}

@end

更新:这是类接口(interface)，SessionTest 类是 NSURLSessionDataDelegate，要开始数据下载，您创建一个 SessionTest 对象并调用 startSession 方法。

@interface SessionTest : NSObject <NSURLSessionDelegate>

- (void) startSession;

@end