[转载]Asp.Net MVC 4 Web API 中的安全认证-使用OAuth

[转载]Asp.Net MVC 4 Web API 中的安全认证-使用OAuth – Nic Pei – 博客园.

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：