Added basic infrastructure for JWT authentication

1 files changed, 46 insertions, 0 deletions

diff --git a/Program.cs b/Program.cs
index 1694587..2c56209 100644
--- a/Program.cs
+++ b/Program.cs
@@ -1,8 +1,11 @@
 using HyperBooru.Server.Components;
 using HyperBooru.Services;
+using Microsoft.AspNetCore.Authentication.JwtBearer;
 using Microsoft.AspNetCore.DataProtection;
 using Microsoft.AspNetCore.Http.Json;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.IdentityModel.Tokens;
+using System.Security.Cryptography;
 using System.Text.Json.Serialization;
 
 namespace HyperBooru.Server;
@@ -39,6 +42,47 @@ public class Program {
                     .GetRequiredService<IConfigService>()
                     .KeyPath));
 
+        // Load our persistently-stored JWT signing key
+        builder.Services.AddSingleton<RSA>(sp => {
+            var keyPath = Path.Combine(
+                sp.GetRequiredService<IConfigService>().KeyPath,
+                "jwt_key");
+
+            var protector = sp.GetRequiredService<IDataProtectionProvider>()
+                .CreateProtector("jwt-signing-key");
+
+            try {
+                var unprotected = protector.Unprotect(File.ReadAllBytes(keyPath));
+                var rsa = RSA.Create();
+                rsa.ImportRSAPrivateKey(unprotected, out var _);
+                return rsa;
+            } catch {
+                var rsa = RSA.Create(4096);
+                var privKey = rsa.ExportRSAPrivateKey();
+                File.WriteAllBytes(keyPath, protector.Protect(privKey));
+                return rsa;
+            }
+        });
+
+        // Configure JWT token-based authentication
+        builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
+            .AddJwtBearer(o => {
+                var rsa = builder.Services.BuildServiceProvider().GetRequiredService<RSA>();
+                o.TokenValidationParameters  = new TokenValidationParameters {
+                    ValidateIssuer           = false,
+                    ValidateAudience         = false,
+                    ValidateIssuerSigningKey = true,
+                    IssuerSigningKey         = new RsaSecurityKey(rsa)
+                };
+            });
+
+        // Configure custom authorization policies
+        builder.Services.AddAuthorization(o => {
+            o.AddPolicy(AuthorizationPolicy.NsfwPolicy, p => {
+                p.RequireClaim("nsfw", "true");
+            });
+        });
+
         var app = builder.Build();
 
         // Ensure database is created and it's schema is up to date
@@ -52,6 +96,8 @@ public class Program {
             app.UseExceptionHandler("/Error");
         }
 
+        app.UseAuthentication();
+        app.UseAuthorization();
         app.UseStatusCodePagesWithReExecute("/not-found", createScopeForStatusCodePages: true);
         app.UseHsts();
         app.UseHttpsRedirection();