fixes #789 - Security Issue: API allows access to any folder of the PC running MediaBrowser

MediaBrowser.Server.Implementations/HttpServer/Security/AuthService.cs

@@ -0,0 +1,113 @@
+using MediaBrowser.Controller.Net;
+using ServiceStack;
+using ServiceStack.Auth;
+using ServiceStack.Web;
+using System;
+using System.Collections.Specialized;
+using System.Linq;
+
+namespace MediaBrowser.Server.Implementations.HttpServer.Security
+{
+    public class AuthService : IAuthService
+    {
+        /// <summary>
+        /// Restrict authentication to a specific <see cref="IAuthProvider"/>.
+        /// For example, if this attribute should only permit access
+        /// if the user is authenticated with <see cref="BasicAuthProvider"/>,
+        /// you should set this property to <see cref="BasicAuthProvider.Name"/>.
+        /// </summary>
+        public string Provider { get; set; }
+
+        /// <summary>
+        /// Redirect the client to a specific URL if authentication failed.
+        /// If this property is null, simply `401 Unauthorized` is returned.
+        /// </summary>
+        public string HtmlRedirect { get; set; }
+
+        public void Authenticate(IRequest req, IResponse res, object requestDto)
+        {
+            if (HostContext.HasValidAuthSecret(req))
+                return;
+
+            ExecuteBasic(req, res, requestDto); //first check if session is authenticated
+            if (res.IsClosed) return; //AuthenticateAttribute already closed the request (ie auth failed)
+
+            ValidateUser(req);
+        }
+
+        private void ValidateUser(IRequest req)
+        {
+            var user = req.TryResolve<ISessionContext>().GetUser(req);
+
+            if (user == null || user.Configuration.IsDisabled)
+            {
+                throw new UnauthorizedAccessException("Unauthorized access.");
+            }
+        }
+
+        private void ExecuteBasic(IRequest req, IResponse res, object requestDto)
+        {
+            if (AuthenticateService.AuthProviders == null)
+                throw new InvalidOperationException(
+                    "The AuthService must be initialized by calling AuthService.Init to use an authenticate attribute");
+
+            var matchingOAuthConfigs = AuthenticateService.AuthProviders.Where(x =>
+                this.Provider.IsNullOrEmpty()
+                || x.Provider == this.Provider).ToList();
+
+            if (matchingOAuthConfigs.Count == 0)
+            {
+                res.WriteError(req, requestDto, "No OAuth Configs found matching {0} provider"
+                    .Fmt(this.Provider ?? "any"));
+                res.EndRequest();
+            }
+
+            matchingOAuthConfigs.OfType<IAuthWithRequest>()
+                .Each(x => x.PreAuthenticate(req, res));
+
+            var session = req.GetSession();
+            if (session == null || !matchingOAuthConfigs.Any(x => session.IsAuthorized(x.Provider)))
+            {
+                if (this.DoHtmlRedirectIfConfigured(req, res, true)) return;
+
+                AuthProvider.HandleFailedAuth(matchingOAuthConfigs[0], session, req, res);
+            }
+        }
+
+        protected bool DoHtmlRedirectIfConfigured(IRequest req, IResponse res, bool includeRedirectParam = false)
+        {
+            var htmlRedirect = this.HtmlRedirect ?? AuthenticateService.HtmlRedirect;
+            if (htmlRedirect != null && req.ResponseContentType.MatchesContentType(MimeTypes.Html))
+            {
+                DoHtmlRedirect(htmlRedirect, req, res, includeRedirectParam);
+                return true;
+            }
+            return false;
+        }
+
+        public static void DoHtmlRedirect(string redirectUrl, IRequest req, IResponse res, bool includeRedirectParam)
+        {
+            var url = req.ResolveAbsoluteUrl(redirectUrl);
+            if (includeRedirectParam)
+            {
+                var absoluteRequestPath = req.ResolveAbsoluteUrl("~" + req.PathInfo + ToQueryString(req.QueryString));
+                url = url.AddQueryParam(HostContext.ResolveLocalizedString(LocalizedStrings.Redirect), absoluteRequestPath);
+            }
+
+            res.RedirectToUrl(url);
+        }
+
+        private static string ToQueryString(INameValueCollection queryStringCollection)
+        {
+            return ToQueryString((NameValueCollection)queryStringCollection.Original);
+        }
+
+        private static string ToQueryString(NameValueCollection queryStringCollection)
+        {
+            if (queryStringCollection == null || queryStringCollection.Count == 0)
+                return String.Empty;
+
+            return "?" + queryStringCollection.ToFormUrlEncoded();
+        }
+    }
+}