Asp.Net MVC 4 Web API 中的安全认证-使用OAuth

各种语言实现的oauth认证： http://oauth.net/code/

上一篇文章介绍了如何使用基本的http认证来实现asp.net web api的跨平台安全认证。 这里说明一个如何使用oauth实现的认证。oauth大家可能不陌生。那么这里需要注意的是我们使用的是.net平台一个比较好的开源oauth库。 DOTNETOPENAUTH。

就像上图所示，我们需要一个ISSSUE Server来给我们一个token，然后再去资源服务器请求资源，也就是Web API Server。

首先在oAuthIssuer服务端我们需要实现一个DotNetOpenAuth的接口:IAuthorizationServer

对接口的实现:

public class OAuth2Issuer : IAuthorizationServer
    {
        private readonly IssuerConfiguration _configuration;

        public OAuth2Issuer(IssuerConfiguration configuration)
        {
            if (configuration == null) throw new ArgumentNullException("configuration");
            _configuration = configuration;
        }

        public RSACryptoServiceProvider AccessTokenSigningKey
        {
            get
            {
                return (RSACryptoServiceProvider)_configuration.SigningCertificate.PrivateKey;
            }
        }

        public DotNetOpenAuth.Messaging.Bindings.ICryptoKeyStore CryptoKeyStore
        {
            get { throw new NotImplementedException(); }
        }

        public TimeSpan GetAccessTokenLifetime(DotNetOpenAuth.OAuth2.Messages.IAccessTokenRequest accessTokenRequestMessage)
        {
            return _configuration.TokenLifetime;
        }

        public IClientDescription GetClient(string clientIdentifier)
        {
            const string secretPassword = "test1243";
            return new ClientDescription(secretPassword, new Uri("http://localhost/"), ClientType.Confidential);
        }

        public RSACryptoServiceProvider GetResourceServerEncryptionKey(DotNetOpenAuth.OAuth2.Messages.IAccessTokenRequest accessTokenRequestMessage)
        {
            return (RSACryptoServiceProvider)_configuration.EncryptionCertificate.PublicKey.Key;

        }

        public bool IsAuthorizationValid(DotNetOpenAuth.OAuth2.ChannelElements.IAuthorizationDescription authorization)
        {
            
            //claims added to the token
            authorization.Scope.Add("adminstrator");
            authorization.Scope.Add("poweruser");
            
            return true;
        }

        public bool IsResourceOwnerCredentialValid(string userName, string password)
        {
            return true;
        }

        public DotNetOpenAuth.Messaging.Bindings.INonceStore VerificationCodeNonceStore
        {
            get
            {
                throw new NotImplementedException();
            }
        }
    }

在 Web API Server端，我们需要使用Http Message Handler来获取httprequest信息；并进行是否有授权认证。

 public class OAuth2Handler : DelegatingHandler
    {
        private readonly ResourceServerConfiguration _configuration;

        public OAuth2Handler(ResourceServerConfiguration configuration)
        {
            if (configuration == null) throw new ArgumentNullException("configuration");
            _configuration = configuration;
        }

        protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
        {
            HttpContextBase httpContext;
            string userName;
            HashSet<string> scope;

            if (!request.TryGetHttpContext(out httpContext))
                throw new InvalidOperationException("HttpContext must not be null.");

            var resourceServer = new ResourceServer(new StandardAccessTokenAnalyzer(
                                                        (RSACryptoServiceProvider)_configuration.IssuerSigningCertificate.PublicKey.Key,
                                                        (RSACryptoServiceProvider)_configuration.EncryptionVerificationCertificate.PrivateKey));

            var error = resourceServer.VerifyAccess(httpContext.Request, out userName, out scope);

            if (error != null)
                return Task<HttpResponseMessage>.Factory.StartNew(error.ToHttpResponseMessage);
            
            var identity = new ClaimsIdentity(scope.Select(s => new Claim(s, s)));
            if (!string.IsNullOrEmpty(userName))
                identity.Claims.Add(new Claim(ClaimTypes.Name, userName));
            
            httpContext.User = ClaimsPrincipal.CreateFromIdentity(identity);
            Thread.CurrentPrincipal = httpContext.User;

            return base.SendAsync(request, cancellationToken);
        }

    }

这里的ResourceServerConfiguration 我们是使用加密证书的。

客户端调用代码：

调用API获取数据之前需要从IssueServer获取Token。

GetAccessToken:

看一下Token信息：

{"access_token":"gAAAAIoUBVBrZ5jAxe5XeTgnJ8mGwwKsCReknueg4gLGlDQ77lR1yPfxt0yNfWLCBT7hxnHjRjuEwDTJ3J1YAnqML4MIgQg8A2cz2bs0EnxvCMfKnayKEesRM-lxLTFbWMpSxe2Xvjm61IbaXjrMkYDRMnV4Do8-7132tiOLIv02WOGlJAEAAIAAAACJ8F3SsE6cTI1XsioW_xOxHeESDzG16y01Gxm3HikYFUC3XIdekpPw0yMB4tavPmUj-kRyC1halbUX7JKf-Dihm6Ou5mexe9lcYTr9or_kH7WcDN5ZCryUK3OaecvwwjQVr5o9XD2ZyZSNDCNhVRFc5ypvP85zZCBW1KJkP3OTCV4AkMN-ROvgI8jxutYdsLLN-YbB7Ot5iypzWWbW0QxiwOzMEqG9nVtPwnIWOUMOvW5KbiELELhgjap60mwHzGrHG4TtA4jrNy8S9zjixO_q-FrgpAuC06CkSH-R4w9yPCLLDc9m3UoAnknFjd4PUbWLxCvlBpEK2sg03ENa0EOKzc2O5fEic9P-BiYt6afMwTgLkJlGBBjmCBpGZMkfLTw","token_type":"bearer","expires_in":"300","scope":"http://localhost/ adminstrator poweruser"}

客户端调用：

 http://www.cnblogs.com/n-pei/archive/2012/05/29/2524673.html