之前已经简单实现了OAUTH2的授权码模式(Authorization Code) ，但是基于JAVA的，今天花了点时间调试了OWIN的实现，基本就把基于OWIN的OAUHT2的四种模式实现完了。官方推荐的.NET 包有

现Katana已经不更新了，新的版本是已经是asp.net core 1.0的一部分，实现OAUTH2好的选择可以考虑使用新版或IdentityServer3对应asp.net core 1.0版本为IdentityServer4。

Startup类

public partial class Startup
    {
        private readonly ConcurrentDictionary<string, string> _authenticationCodes = new ConcurrentDictionary<string, string>(StringComparer.Ordinal);
        public void ConfigureAuth(IAppBuilder app)
        {
            app.UseCookieAuthentication(new CookieAuthenticationOptions
            {
                AuthenticationType = Paths.AuthenticationType,
                AuthenticationMode = AuthenticationMode.Passive,
                LoginPath = new PathString(Paths.LoginPath),
                LogoutPath = new PathString(Paths.LogoutPath),
            });

            app.UseOAuthBearerTokens(new OAuthAuthorizationServerOptions
            {
                AuthorizeEndpointPath = new PathString(Paths.AuthorizePath),
                TokenEndpointPath = new PathString(Paths.TokenPath),
                AccessTokenExpireTimeSpan = TimeSpan.FromHours(2),
                Provider = new OAuthAuthorizationServerProvider
                {
                    OnValidateClientRedirectUri = ValidateClientRedirectUri,
                    OnValidateClientAuthentication = ValidateClientAuthentication,
                    OnGrantResourceOwnerCredentials = GrantResourceOwnerCredentials,
                    OnGrantClientCredentials = GrantClientCredetails
                },
                //Provider = new ApplicationOAuthProvider(),
                AuthorizationCodeProvider = new AuthenticationTokenProvider
                {
                    OnCreate = CreateAuthenticationCode,
                    OnReceive = ReceiveAuthenticationCode,
                },
                RefreshTokenProvider = new AuthenticationTokenProvider
                {
                    OnCreate = CreateRefreshToken,
                    OnReceive = ReceiveRefreshToken,
                },
                ApplicationCanDisplayErrors = true,
#if DEBUG
                //HTTPS is allowed only AllowInsecureHttp = false
                AllowInsecureHttp = true,
#endif
            });
        }

        private void CreateAuthenticationCode(AuthenticationTokenCreateContext context)
        {
            context.SetToken(Guid.NewGuid().ToString("n") + Guid.NewGuid().ToString("n"));
            _authenticationCodes[context.Token] = context.SerializeTicket();
        }

        private void ReceiveAuthenticationCode(AuthenticationTokenReceiveContext context)
        {
            string value;
            if (_authenticationCodes.TryRemove(context.Token, out value))
            {
                context.DeserializeTicket(value);
            }
        }

        private Task GrantClientCredetails(OAuthGrantClientCredentialsContext context)
        {
            var identity = new ClaimsIdentity(new GenericIdentity(context.ClientId, OAuthDefaults.AuthenticationType), context.Scope.Select(x => new Claim("urn:oauth:scope", x)));
            context.Validated(identity);
            return Task.FromResult(0);
        }

        private Task GrantResourceOwnerCredentials(OAuthGrantResourceOwnerCredentialsContext context)
        {
            var identity = new ClaimsIdentity(new GenericIdentity(context.UserName, OAuthDefaults.AuthenticationType), context.Scope.Select(x => new Claim("urn:oauth:scope", x)));
            context.Validated(identity);
            return Task.FromResult(0);
        }

        private Task ValidateClientAuthentication(OAuthValidateClientAuthenticationContext context)
        {
            string clientId;
            string clientSecret;
            if (context.TryGetBasicCredentials(out clientId, out clientSecret) || context.TryGetFormCredentials(out clientId, out clientSecret))
            {
                context.Validated();
            }
            return Task.FromResult(0);
        }

        private Task ValidateClientRedirectUri(OAuthValidateClientRedirectUriContext context)
        {
            if (context.ClientId == Clients.Client1.Id)
            {
                context.Validated();
                //context.Validated(Clients.Client1.RedirectUrl);
            }
            else if (context.ClientId == Clients.Client2.Id)
            {
                context.Validated(Clients.Client2.RedirectUrl);
            }
            return Task.FromResult(0);
        }


        private void CreateRefreshToken(AuthenticationTokenCreateContext context)
        {
            context.SetToken(context.SerializeTicket());
        }

        private void ReceiveRefreshToken(AuthenticationTokenReceiveContext context)
        {
            context.DeserializeTicket(context.Token);
        }
    }

OAuthController

/// <summary>
        /// 授权码模式授权
        /// </summary>
        /// <returns></returns>
        public ActionResult Authorize()
        {
            var authentication = HttpContext.GetOwinContext().Authentication;
            var ticket = authentication.AuthenticateAsync(Paths.AuthenticationType).Result;
            var identity = ticket != null ? ticket.Identity : null;
            if (identity == null)
            {
                authentication.Challenge(Paths.AuthenticationType);
                return new HttpUnauthorizedResult();
            }
            var scopes = (Request.QueryString.Get("scope") ?? "").Split(' ');
            if (Request.HttpMethod == "POST")
            {
                if (!string.IsNullOrEmpty(Request.Form.Get("submit.Grant")))
                {
                    identity = new ClaimsIdentity(identity.Claims, "Bearer", identity.NameClaimType, identity.RoleClaimType);
                    foreach (var scope in scopes)
                    {
                        identity.AddClaim(new Claim("urn:oauth:scope", scope));
                    }
                    authentication.SignIn(identity);
                }
                if (!string.IsNullOrEmpty(Request.Form.Get("submit.Login")))
                {
                    authentication.SignOut("Application");
                    authentication.Challenge("Application");
                    return new HttpUnauthorizedResult();
                }
            }
            return View();
        }

AccountController

/// <summary>
        /// 用户登录
        /// </summary>
        /// <returns></returns>
        public ActionResult Login()
        {
            var authentication = HttpContext.GetOwinContext().Authentication;
            if (Request.HttpMethod == "POST")
            {
                var isPersistent = !string.IsNullOrEmpty(Request.Form.Get("isPersistent"));
                if (!string.IsNullOrEmpty(Request.Form.Get("submit.Signin")))
                {
                    authentication.SignIn(
                        new AuthenticationProperties { IsPersistent = isPersistent },
                        new ClaimsIdentity(new[] { new Claim(ClaimsIdentity.DefaultNameClaimType, Request.Form["username"]) }, "Application"));
                }
            }
            return View();
        }

        /// <summary>
        /// 退出
        /// </summary>
        /// <returns></returns>
        public ActionResult Logout()
        {
            return View();
        }

调试

获得授权码
GET /oauth/authorize?client_id=irving&redirect_uri=http://localhost:38500/oauth_callback&state=LYUVwcuaGuKeRTjxhdFzhQ&scope=bio

%20notes&response_type=code HTTP/1.1

http://localhost:56889/oauth/authorize?

client_id=irving&redirect_uri=http://localhost:38500/oauth_callback&state=LYUVwcuaGuKeRTjxhdFzhQ&scope=bio%20notes&response_type=code

页面重定向
HTTP/1.1 302 Found
Location: /oauth_callback?code=SplxlOBeZQQYbYS6WxSbIA&state=xyz

http://localhost:56889/oauth_callback?code=0aa3e35bd515413bb93bdb6fb015591cc763a8d30c554730a07ebd39e3149252&state=LYUVwcuaGuKeRTjxhdFzhQ

获得令牌
POST /token HTTP/1.1
Host: server.example.com
Authorization: Basic czZCaGRSa3F0MzpnWDFmQmF0M2JW
Content-Type: application/x-www-form-urlencoded

grant_type=authorization_code&code=929dc42905a24e79bdf028f7043769acddd90056ca8141708b3834ec174e8083&state=LYUVwcuaGuKeRTjxhdFzhQ&redirect_uri=http://localhost:38500/oauth_callback

源码:https://github.com/zhouyongtao/SecuringForWebAPI/tree/master/KatanaForWebAPI

注意事项

资源服务器识别认证服务器颁发的令牌，需要配置相同的machinekey

<machineKey decryptionKey="B7EFF1C5839A624E3F97D0268917EDE82F408D2ECBFAC817" validation="SHA1" validationKey="C2B8DF31AB9624D69428066DFDA1A479542825F3B48865C4E47AF6A026F22D853DEC2B3248DF268599BF89EF78B9E86CA05AC73577E0D5A14C45E0267588850B" />

REFER:
http://beginor.github.io/2015/01/24/oauth2-server-with-owin.html
http://www.asp.net/aspnet/overview/owin-and-katana/owin-oauth-20-authorization-server

秒客网

基于OWIN WebAPI 使用OAUTH2授权服务【授权码模式(Authorization Code)】

调试

注意事项

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