年前的时候，关于苹果要强制https的传言四起，虽然结果只是一个“谣言”，但是很明显的这是迟早会到来的，间接上加速了各公司加紧上https的节奏，对于iOS客户端来说，上https需不需要改变一些东西取决于---------对，就是公司有没有钱。土豪公司直接买买买，iOS开发者只需要把http改成https完事。然而很不幸，我们在没钱的公司，选择了自签证书。虽然网上很多关于https的适配，然而很多都是已过时的，这里我们主要是讲一下https双向认证。
【证书选择】自签
【网络请求】原生NSURLSession或者AFNetworking3.0以上版本
【认证方式】双向认证
Https双向认证过程
先来了解一下双向认证的大体过程：（图片来自网络，如果是某位博主原创的请私信我）
下面我们一步步来实现
1、设置服务端证书
NSString *certFilePath = [[NSBundle mainBundle] pathForResource:@"server" ofType:@"cer"]; NSData *certData = [NSData dataWithContentsOfFile:certFilePath]; NSSet *certSet = [NSSet setWithObject:certData]; AFSecurityPolicy *policy = [AFSecurityPolicy policyWithPinningMode:AFSSLPinningModeCertificate withPinnedCertificates:certSet]; policy.allowInvalidCertificates = YES; policy.validatesDomainName = NO; self.afnetworkingManager.securityPolicy = policy;
2、处理挑战
原生的NSURLSession是在
- (void)URLSession:(NSURLSession *)session didReceiveChallenge:(nonnull NSURLAuthenticationChallenge *)challenge completionHandler:(nonnull void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential * _Nullable))completionHandler
代理方法里面处理挑战的，再看看AFNetworking在该代理方法里处理的代码
if (self.taskDidReceiveAuthenticationChallenge) { disposition = self.taskDidReceiveAuthenticationChallenge(session, task, challenge, &credential); } else { ... }
我们只需要给它传递一个处理的block
[self.afnetworkingManager setSessionDidReceiveAuthenticationChallengeBlock:^NSURLSessionAuthChallengeDisposition(NSURLSession*session, NSURLAuthenticationChallenge *challenge, NSURLCredential *__autoreleasing*_credential) { ... }
根据传来的challenge生成disposition（应对挑战的方式）和credential（客户端生成的挑战证书）
3、服务端认证
当challenge的认证方法为NSURLAuthenticationMethodServerTrust时，需要客户端认证服务端证书
//评估服务端安全性 if([weakSelf.afnetworkingManager.securityPolicy evaluateServerTrust:challenge.protectionSpace.serverTrust forDomain:challenge.protectionSpace.host]) { //创建凭据 credential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust]; if(credential) { disposition =NSURLSessionAuthChallengeUseCredential; } else { disposition =NSURLSessionAuthChallengePerformDefaultHandling; } } else { disposition = NSURLSessionAuthChallengeCancelAuthenticationChallenge; }
4、客户端认证
认证完服务端后，需要认证客户端
由于是双向认证，这一步是必不可省的
SecIdentityRef identity = NULL; SecTrustRef trust = NULL; NSString *p12 = [[NSBundle mainBundle] pathForResource:@"client"ofType:@"p12"]; NSFileManager *fileManager =[NSFileManager defaultManager]; if(![fileManager fileExistsAtPath:p12]) { NSLog(@"client.p12:not exist"); } else { NSData *PKCS12Data = [NSData dataWithContentsOfFile:p12]; if ([[weakSelf class]extractIdentity:&identity andTrust:&trust fromPKCS12Data:PKCS12Data]) { SecCertificateRef certificate = NULL; SecIdentityCopyCertificate(identity, &certificate); const void*certs[] = {certificate}; CFArrayRef certArray =CFArrayCreate(kCFAllocatorDefault, certs,1,NULL); credential =[NSURLCredential credentialWithIdentity:identity certificates:(__bridge NSArray*)certArray persistence:NSURLCredentialPersistencePermanent]; disposition =NSURLSessionAuthChallengeUseCredential; } }
+ (BOOL)extractIdentity:(SecIdentityRef*)outIdentity andTrust:(SecTrustRef *)outTrust fromPKCS12Data:(NSData *)inPKCS12Data { OSStatus securityError = errSecSuccess; //client certificate password NSDictionary*optionsDictionary = [NSDictionary dictionaryWithObject:@"your p12 file pwd" forKey:(__bridge id)kSecImportExportPassphrase]; CFArrayRef items = CFArrayCreate(NULL, 0, 0, NULL); securityError = SecPKCS12Import((__bridge CFDataRef)inPKCS12Data,(__bridge CFDictionaryRef)optionsDictionary,&items); if(securityError == 0) { CFDictionaryRef myIdentityAndTrust =CFArrayGetValueAtIndex(items,0); const void*tempIdentity =NULL; tempIdentity= CFDictionaryGetValue (myIdentityAndTrust,kSecImportItemIdentity); *outIdentity = (SecIdentityRef)tempIdentity; const void*tempTrust =NULL; tempTrust = CFDictionaryGetValue(myIdentityAndTrust,kSecImportItemTrust); *outTrust = (SecTrustRef)tempTrust; } else { NSLog(@"Failedwith error code %d",(int)securityError); return NO; } return YES; }
原生NSURLSession双向认证
在原生的代理方法里面认证就行，代码基本和AFNetworking的一致，注意最后需要调用
completionHandler(NSURLSessionAuthChallengeUseCredential, credential);
来执行回调操作
关于UIWebView的Https双向认证
网上的资料大体上有几种解决方法
1：跳过Https认证（这还能跳过？没试过，不太靠谱）