Network Access Policy

3 files changed, 70 insertions, 1 deletions

diff --git a/Jellyfin.Api/Auth/BaseAuthorizationHandler.cs b/Jellyfin.Api/Auth/BaseAuthorizationHandler.cs
index 7d68aecf9..456f45d97 100644
--- a/Jellyfin.Api/Auth/BaseAuthorizationHandler.cs
+++ b/Jellyfin.Api/Auth/BaseAuthorizationHandler.cs
@@ -1,4 +1,4 @@
-using System.Security.Claims;
+using System.Security.Claims;
 using Jellyfin.Api.Helpers;
 using Jellyfin.Data.Enums;
 using MediaBrowser.Common.Extensions;
@@ -37,6 +37,16 @@ namespace Jellyfin.Api.Auth
         }
 
         /// <summary>
+        /// Gets a value indicating <see cref="INetworkManager"/> being used.
+        /// </summary>
+        protected INetworkManager NetworkManager => _networkManager;
+
+        /// <summary>
+        /// Gets a value indicating the <see cref="HttpContextAccessor"/> being used.
+        /// </summary>
+        protected IHttpContextAccessor HttpContextAccessor => _httpContextAccessor;
+
+        /// <summary>
         /// Validate authenticated claims.
         /// </summary>
         /// <param name="claimsPrincipal">Request claims.</param>
diff --git a/Jellyfin.Api/Auth/NetworkAccessPolicy/NetworkAccessHandler.cs b/Jellyfin.Api/Auth/NetworkAccessPolicy/NetworkAccessHandler.cs
new file mode 100644
index 000000000..e6b33f565
--- /dev/null
+++ b/Jellyfin.Api/Auth/NetworkAccessPolicy/NetworkAccessHandler.cs
@@ -0,0 +1,48 @@
+using System.Threading.Tasks;
+using Jellyfin.Api.Auth;
+using MediaBrowser.Common.Extensions;
+using MediaBrowser.Common.Net;
+using MediaBrowser.Controller.Library;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Http;
+
+namespace Jellyfin.Api.Auth.NetworkAccessPolicy
+{
+    /// <summary>
+    /// Local access handler.
+    /// </summary>
+    public class NetworkAccessHandler : BaseAuthorizationHandler<NetworkAccessRequirement>
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="NetworkAccessHandler"/> class.
+        /// </summary>
+        /// <param name="userManager">Instance of the <see cref="IUserManager"/> interface.</param>
+        /// <param name="networkManager">Instance of the <see cref="INetworkManager"/> interface.</param>
+        /// <param name="httpContextAccessor">Instance of the <see cref="IHttpContextAccessor"/> interface.</param>
+        public NetworkAccessHandler(
+            IUserManager userManager,
+            INetworkManager networkManager,
+            IHttpContextAccessor httpContextAccessor)
+            : base(userManager, networkManager, httpContextAccessor)
+        {
+        }
+
+        /// <inheritdoc />
+        protected override Task HandleRequirementAsync(AuthorizationHandlerContext context, NetworkAccessRequirement requirement)
+        {
+            var ip = HttpContextAccessor.HttpContext?.Connection.RemoteIpAddress;
+
+            // Loopback will be on LAN, so we can accept null.
+            if (ip == null || NetworkManager.IsInLocalNetwork(ip))
+            {
+                context.Succeed(requirement);
+            }
+            else
+            {
+                context.Fail();
+            }
+
+            return Task.CompletedTask;
+        }
+    }
+}
diff --git a/Jellyfin.Api/Auth/NetworkAccessPolicy/NetworkAccessRequirement.cs b/Jellyfin.Api/Auth/NetworkAccessPolicy/NetworkAccessRequirement.cs
new file mode 100644
index 000000000..b5431501b
--- /dev/null
+++ b/Jellyfin.Api/Auth/NetworkAccessPolicy/NetworkAccessRequirement.cs
@@ -0,0 +1,11 @@
+using Microsoft.AspNetCore.Authorization;
+
+namespace Jellyfin.Api.Auth.NetworkAccessPolicy
+{
+    /// <summary>
+    /// The local network authorization requirement.
+    /// </summary>
+    public class NetworkAccessRequirement : IAuthorizationRequirement
+    {
+    }
+}