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

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

@@ -0,0 +1,96 @@
+using System;
+using System.Collections.Generic;
+using MediaBrowser.Controller.Net;
+using ServiceStack.Web;
+
+namespace MediaBrowser.Server.Implementations.HttpServer.Security
+{
+    public class AuthorizationContext : IAuthorizationContext
+    {
+        public AuthorizationInfo GetAuthorizationInfo(IRequest requestContext)
+        {
+            return GetAuthorization(requestContext);
+        }
+
+        /// <summary>
+        /// Gets the authorization.
+        /// </summary>
+        /// <param name="httpReq">The HTTP req.</param>
+        /// <returns>Dictionary{System.StringSystem.String}.</returns>
+        private static AuthorizationInfo GetAuthorization(IRequest httpReq)
+        {
+            var auth = GetAuthorizationDictionary(httpReq);
+
+            string userId = null;
+            string deviceId = null;
+            string device = null;
+            string client = null;
+            string version = null;
+
+            if (auth != null)
+            {
+                auth.TryGetValue("UserId", out userId);
+                auth.TryGetValue("DeviceId", out deviceId);
+                auth.TryGetValue("Device", out device);
+                auth.TryGetValue("Client", out client);
+                auth.TryGetValue("Version", out version);
+            }
+
+            return new AuthorizationInfo
+            {
+                Client = client,
+                Device = device,
+                DeviceId = deviceId,
+                UserId = userId,
+                Version = version
+            };
+        }
+
+        /// <summary>
+        /// Gets the auth.
+        /// </summary>
+        /// <param name="httpReq">The HTTP req.</param>
+        /// <returns>Dictionary{System.StringSystem.String}.</returns>
+        private static Dictionary<string, string> GetAuthorizationDictionary(IRequest httpReq)
+        {
+            var auth = httpReq.Headers["Authorization"];
+
+            return GetAuthorization(auth);
+        }
+
+        /// <summary>
+        /// Gets the authorization.
+        /// </summary>
+        /// <param name="authorizationHeader">The authorization header.</param>
+        /// <returns>Dictionary{System.StringSystem.String}.</returns>
+        private static Dictionary<string, string> GetAuthorization(string authorizationHeader)
+        {
+            if (authorizationHeader == null) return null;
+
+            var parts = authorizationHeader.Split(' ');
+
+            // There should be at least to parts
+            if (parts.Length < 2) return null;
+
+            // It has to be a digest request
+            if (!string.Equals(parts[0], "MediaBrowser", StringComparison.OrdinalIgnoreCase))
+            {
+                return null;
+            }
+
+            // Remove uptil the first space
+            authorizationHeader = authorizationHeader.Substring(authorizationHeader.IndexOf(' '));
+            parts = authorizationHeader.Split(',');
+
+            var result = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
+
+            foreach (var item in parts)
+            {
+                var param = item.Trim().Split(new[] { '=' }, 2);
+                result.Add(param[0], param[1].Trim(new[] { '"' }));
+            }
+
+            return result;
+        }
+    }
+}