Asp.Net MVC 4 Web API 中的安全认证-使用OAuth

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：





代码：
http://pan.baidu.com/s/1ntkMbCt