Https 单向验证 双向验证

  • 通讯原理
participant Client
    participant Server
    Client->>Server: 以明文传输数据，主要有客户端支持的SSL版本等客户端支持的加密信息
    Server-->>Server: 服务端选择加密方式
    
    Server-->>Client: 服务端给客户端返回SSL版本、随机数等信息
    Client->>Client: 校验服务端证书是否合法、产生随机数
    
    Client->>Server: 使用服务端随机数加密数据发给服务端
    Server-->>Server: 服务端使用私钥解密客户端数据
    
    Server-->>Client: 使用收到的随机数，加密数据，返回给客户端
    Client->>Client: 客户端使用公钥解密数据
  • iOS客户端不验证证书
//适配HTTPS
    AFSecurityPolicy *securityPolicy = [AFSecurityPolicy policyWithPinningMode:AFSSLPinningModeNone];
    [securityPolicy setValidatesDomainName:NO];
    securityPolicy.allowInvalidCertificates = YES;
    manager.securityPolicy = securityPolicy;

设置代理后进行Charles代理拦截，以下为详细信息：(保证客户端不验证证书，保证在iOS设备上信任Charles证书)

Client SSL handshake failed - Remote host closed connection during handshake
客户端SSL握手失败-握手期间远程主机关闭连接

You may need to configure your browser or application to trust the Charles Root Certificate. See SSL Proxying in the Help menu.
您可能需要配置浏览器或应用程序以信任Charles根证书。请参见“帮助”菜单中的“SSL代理”。



  • AFN单项验证 客户端验证服务端证书
Https在建立Socket连接之前，需要进行握手。

1.客户端向服务端发送SSL协议版本号、加密算法种类、随机数等信息。
2.服务端给客户端返回SSL协议版本号、加密算法种类、随机数等信息，同时也返回服务器端的证书，即公钥证书
3.客户端使用服务端返回的信息验证服务器的合法性，包括：
证书是否过期
发型服务器证书的CA是否可靠
返回的公钥是否能正确解开返回证书中的数字签名
服务器证书上的域名是否和服务器的实际域名相匹配
验证通过后，将继续进行通信，否则，终止通信
4.客户端向服务端发送自己所能支持的对称加密方案，供服务器端进行选择
5.服务器端在客户端提供的加密方案中选择加密程度最高的加密方式。
6.服务器将选择好的加密方案通过明文方式返回给客户端
7.客户端接收到服务端返回的加密方式后，使用该加密方式生成产生随机码，用作通信过程中对称加密的密钥，使用服务端返回的公钥进行加密，将加密后的随机码发送至服务器
8.服务器收到客户端返回的加密信息后，使用自己的私钥进行解密，获取对称加密密钥。 
9.在接下来的会话中，服务器和客户端将会使用该密码进行对称加密，保证通信过程中信息的安全。
  • AFN 双向验证方案 增加了服务端对客户端的验证
- (void)POST:(NSString *)urlString
  Dictionary:(NSDictionary *)dic
    progress:(void (^)(NSProgress * _Nonnull))uploadProgress
     success:(void (^)(NSURLSessionDataTask * _Nonnull, id _Nullable))success
     failure:(void (^)(NSURLSessionDataTask * _Nullable, NSError * _Nonnull))failure
{
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    //    设置超时时间
    [manager.requestSerializer willChangeValueForKey:@"timeoutInterval"];
    manager.requestSerializer.timeoutInterval = 30.f;
    [manager.requestSerializer didChangeValueForKey:@"timeoutInterval"];
    [manager.requestSerializer setValue:@"Content-Type" forHTTPHeaderField:@"application/json; charset=utf-8"];
    [manager setSecurityPolicy:[self customSecurityPolicy]];
    [self checkCredential:manager];
    
    NSData *data = [NSJSONSerialization dataWithJSONObject:dic options:NSJSONWritingPrettyPrinted error:nil];
    NSString *jsonString = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];    
    [manager POST:urlString parameters:jsonString progress:uploadProgress success:success failure:failure];
}

- (AFSecurityPolicy*)customSecurityPolicy {
    AFSecurityPolicy *securityPolicy = [AFSecurityPolicy policyWithPinningMode:AFSSLPinningModeCertificate];
    //tomcat1(1)
    NSString * cerPath = [[NSBundle mainBundle] pathForResource:@"server" ofType:@"cer"];
    NSData *certData = [NSData dataWithContentsOfFile:cerPath];
    NSSet   *dataSet = [NSSet setWithArray:@[certData]];
    [securityPolicy setAllowInvalidCertificates:YES];
    [securityPolicy setPinnedCertificates:dataSet];
    [securityPolicy setValidatesDomainName:YES];
    
    return securityPolicy;
}

//校验证书
- (void)checkCredential:(AFURLSessionManager *)manager
{
    [manager setSessionDidBecomeInvalidBlock:^(NSURLSession * _Nonnull session, NSError * _Nonnull error) {
    }];
    __weak typeof(manager)weakManager = manager;
    [manager setSessionDidReceiveAuthenticationChallengeBlock:^NSURLSessionAuthChallengeDisposition(NSURLSession*session, NSURLAuthenticationChallenge *challenge, NSURLCredential *__autoreleasing*_credential) {
        NSURLSessionAuthChallengeDisposition disposition = NSURLSessionAuthChallengePerformDefaultHandling;
        __autoreleasing NSURLCredential *credential =nil;
        NSLog(@"authenticationMethod=%@",challenge.protectionSpace.authenticationMethod);
        //判断是核验客户端证书还是服务器证书
        if([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]) {
            // 基于客户端的安全策略来决定是否信任该服务器，不信任的话，也就没必要响应挑战
            if([weakManager.securityPolicy evaluateServerTrust:challenge.protectionSpace.serverTrust forDomain:challenge.protectionSpace.host]) {
                // 创建挑战证书（注：挑战方式为UseCredential和PerformDefaultHandling都需要新建挑战证书）
                NSLog(@"serverTrust=%@",challenge.protectionSpace.serverTrust);
                credential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];
                // 确定挑战的方式
                if (credential) {
                    //证书挑战  设计policy,none，则跑到这里
                    disposition = NSURLSessionAuthChallengeUseCredential;
                } else {
                    disposition = NSURLSessionAuthChallengePerformDefaultHandling;
                }
            } else {
                disposition = NSURLSessionAuthChallengeCancelAuthenticationChallenge;
            }
        } else {
            // client authentication
            SecIdentityRef identity = NULL;
            SecTrustRef trust = NULL;
            NSString *p12 = [[NSBundle mainBundle] pathForResource:@"app"ofType:@"p12"];
            NSFileManager *fileManager =[NSFileManager defaultManager];
            
            if(![fileManager fileExistsAtPath:p12])
            {
                NSLog(@"client.p12:not exist");
            }
            else
            {
                NSData *PKCS12Data = [NSData dataWithContentsOfFile:p12];
                
                if ([self 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;
                }
            }
        }
        *_credential = credential;
        return disposition;
    }];
}

//读取p12文件中的密码
- (BOOL)extractIdentity:(SecIdentityRef*)outIdentity andTrust:(SecTrustRef *)outTrust fromPKCS12Data:(NSData *)inPKCS12Data {
    OSStatus securityError = errSecSuccess;
    //client certificate password
    NSDictionary *optionsDictionary = [NSDictionary dictionaryWithObject:@"123456"
                                                                 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;
}
  • 检查手机是否设置了代理 需要导入框架CFNetwork
    然后，这个方法是mrc的：需要添加-fno-objc-arc的flag
- (BOOL) checkProxySetting {
    NSDictionary *proxySettings = (__bridge NSDictionary *)(CFNetworkCopySystemProxySettings());
    NSArray *proxies = (__bridge NSArray *)(CFNetworkCopyProxiesForURL((__bridge CFURLRef _Nonnull)([NSURL URLWithString:@"https://www.baidu.com"]), (__bridge CFDictionaryRef _Nonnull)(proxySettings)));
    NSLog(@"
%@",proxies);

    NSDictionary *settings = proxies[0];
    NSLog(@"%@",[settings objectForKey:(NSString *)kCFProxyHostNameKey]);
    NSLog(@"%@",[settings objectForKey:(NSString *)kCFProxyPortNumberKey]);
    NSLog(@"%@",[settings objectForKey:(NSString *)kCFProxyTypeKey]);

    if ([[settings objectForKey:(NSString *)kCFProxyTypeKey] isEqualToString:@"kCFProxyTypeNone"])
    {
        NSLog(@"没设置代理");
        return NO;
    }
    else
    {
        
        NSLog(@"设置了代理");
        return YES;
    }

}
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原文地址：https://www.cnblogs.com/lidarui/p/10413840.html