iOS, 使用自签名证书https请求，（NSURLSession)

上篇说到了已经完成服务端环境搭建， 并且完成了测试。 

  这里来倒腾一下iOS端， 这里使用的类为NSURLSession,  网上很多代码， 发现大多都有问题。 无法正常使用。

把client.p12导入进入项目，添加测试代码

    NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] 
    						delegate:self delegateQueue:[NSOperationQueue mainQueue]];
    
    NSURLSessionDataTask *task = [session dataTaskWithURL:[NSURL URLWithString:@"https://192.168.3.210:8443/dynamicWebProject/login/map.form"] 
    completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        NSLog(@"%@", [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);
    }];
    
    [task resume];

实现NSURLSessionDelegate，

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

这里主要完成的就是证书的操作。

- (void)URLSession:(NSURLSession *)session didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge
 completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential * _Nullable credential))completionHandler
{
    NSLog(@"didReceiveChallenge ");
    if ([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]) {
        NSLog(@"server ---------");
//        [challenge.sender useCredential:[NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust] forAuthenticationChallenge:challenge];
        NSString *host = challenge.protectionSpace.host;
        NSLog(@"%@", host);
        
        NSURLCredential *credential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];
        
        
        completionHandler(NSURLSessionAuthChallengeUseCredential, credential);
    }
    else if([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodClientCertificate])
    {
        //客户端证书认证
        //TODO:设置客户端证书认证
        // load cert
        NSLog(@"client");
        NSString *path = [[NSBundle mainBundle]pathForResource:@"client"ofType:@"p12"];
        NSData *p12data = [NSData dataWithContentsOfFile:path];
        CFDataRef inP12data = (__bridge CFDataRef)p12data;
        SecIdentityRef myIdentity;
        OSStatus status = [self extractIdentity:inP12data toIdentity:&myIdentity];
        if (status != 0) {
            return;
        }
        SecCertificateRef myCertificate;
        SecIdentityCopyCertificate(myIdentity, &myCertificate);
        const void *certs[] = { myCertificate };
        CFArrayRef certsArray =CFArrayCreate(NULL, certs,1,NULL);
        NSURLCredential *credential = [NSURLCredential credentialWithIdentity:myIdentity certificates:(__bridge NSArray*)certsArray persistence:NSURLCredentialPersistencePermanent];
//        [[challenge sender] useCredential:credential forAuthenticationChallenge:challenge];
//         网上很多错误代码如上，正确的为：
            completionHandler(NSURLSessionAuthChallengeUseCredential, credential);
    }
}

- (OSStatus)extractIdentity:(CFDataRef)inP12Data toIdentity:(SecIdentityRef*)identity {
    OSStatus securityError = errSecSuccess;
    CFStringRef password = CFSTR("123456");
    const void *keys[] = { kSecImportExportPassphrase };
    const void *values[] = { password };
    CFDictionaryRef options = CFDictionaryCreate(NULL, keys, values, 1, NULL, NULL);
    CFArrayRef items = CFArrayCreate(NULL, 0, 0, NULL);
    securityError = SecPKCS12Import(inP12Data, options, &items);
    if (securityError == 0)
    {
        CFDictionaryRef ident = CFArrayGetValueAtIndex(items,0);
        const void *tempIdentity = NULL;
        tempIdentity = CFDictionaryGetValue(ident, kSecImportItemIdentity);
        *identity = (SecIdentityRef)tempIdentity;
    }
    else
    {
        NSLog(@"clinet.p12 error!");
    }
    
    if (options) {
        CFRelease(options);
    }
    return securityError;
}

亲测代码能正常运行。