JobTrackerApi.Tests/EmailOwnershipIntegrationTests.cs

@@ -0,0 +1,153 @@
+using JobTrackerApi.Controllers;
+using JobTrackerApi.Data;
+using JobTrackerApi.Models;
+using JobTrackerApi.Services;
+using Microsoft.AspNetCore.DataProtection;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Data.Sqlite;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging.Abstractions;
+using Moq;
+using Xunit;
+
+namespace JobTrackerApi.Tests;
+
+public sealed class EmailOwnershipIntegrationTests
+{
+    [Fact]
+    public async Task Real_confirmation_token_is_single_use()
+    {
+        await using var fixture = await Fixture.CreateAsync();
+        var user = await fixture.CreateUserAsync("person@example.test", "person@example.test", confirmed: false);
+        var token = await fixture.Users.GenerateEmailConfirmationTokenAsync(user);
+        var controller = fixture.Controller();
+
+        Assert.IsType<NoContentResult>(await controller.VerifyEmail(new AuthController.VerifyEmailRequest(user.Id, token)));
+        Assert.IsType<BadRequestObjectResult>(await controller.VerifyEmail(new AuthController.VerifyEmailRequest(user.Id, token)));
+        Assert.True((await fixture.Users.FindByIdAsync(user.Id))!.EmailConfirmed);
+    }
+
+    [Fact]
+    public async Task Real_expired_confirmation_token_is_rejected()
+    {
+        await using var fixture = await Fixture.CreateAsync(TimeSpan.Zero);
+        var user = await fixture.CreateUserAsync("expired@example.test", "expired@example.test", confirmed: false);
+        var token = await fixture.Users.GenerateEmailConfirmationTokenAsync(user);
+        await Task.Delay(20);
+
+        var result = await fixture.Controller().VerifyEmail(new AuthController.VerifyEmailRequest(user.Id, token));
+
+        Assert.IsType<BadRequestObjectResult>(result);
+        Assert.False((await fixture.Users.FindByIdAsync(user.Id))!.EmailConfirmed);
+    }
+
+    [Fact]
+    public async Task Real_change_email_token_preserves_custom_username_and_cannot_be_replayed()
+    {
+        await using var fixture = await Fixture.CreateAsync();
+        var user = await fixture.CreateUserAsync("old@example.test", "ada", confirmed: true);
+        user.PendingEmail = "new@example.test";
+        user.PendingEmailRequestedAtUtc = DateTimeOffset.UtcNow;
+        Assert.True((await fixture.Users.UpdateAsync(user)).Succeeded);
+        var token = await fixture.Users.GenerateChangeEmailTokenAsync(user, user.PendingEmail);
+        var request = new AuthController.ConfirmEmailChangeRequest(user.Id, user.PendingEmail, token);
+        var controller = fixture.Controller();
+
+        Assert.IsType<NoContentResult>(await controller.ConfirmEmailChange(request, default));
+        fixture.Db.ChangeTracker.Clear();
+        var changed = Assert.IsType<ApplicationUser>(await fixture.Users.FindByIdAsync(user.Id));
+        Assert.Equal("new@example.test", changed.Email);
+        Assert.Equal("ada", changed.UserName);
+        Assert.Null(changed.PendingEmail);
+        Assert.IsType<BadRequestObjectResult>(await controller.ConfirmEmailChange(request, default));
+    }
+
+    private sealed class Fixture : IAsyncDisposable
+    {
+        private readonly SqliteConnection _connection;
+        private readonly ServiceProvider _provider;
+        private readonly Mock<IAppEmailSender> _email = new();
+        public JobTrackerContext Db { get; }
+        public UserManager<ApplicationUser> Users { get; }
+
+        private Fixture(SqliteConnection connection, ServiceProvider provider, JobTrackerContext db, UserManager<ApplicationUser> users)
+        {
+            _connection = connection;
+            _provider = provider;
+            Db = db;
+            Users = users;
+        }
+
+        public static async Task<Fixture> CreateAsync(TimeSpan? tokenLifespan = null)
+        {
+            var connection = new SqliteConnection("Data Source=:memory:");
+            await connection.OpenAsync();
+            var services = new ServiceCollection();
+            services.AddLogging();
+            services.AddDataProtection();
+            services.AddHttpContextAccessor();
+            services.AddScoped<CurrentUserService>();
+            services.AddScoped<ICurrentUserService>(provider => provider.GetRequiredService<CurrentUserService>());
+            services.AddDbContext<JobTrackerContext>((_, options) => options.UseSqlite(connection));
+            services.AddIdentityCore<ApplicationUser>(options => options.User.RequireUniqueEmail = true)
+                .AddRoles<IdentityRole>()
+                .AddEntityFrameworkStores<JobTrackerContext>()
+                .AddDefaultTokenProviders();
+            if (tokenLifespan is not null)
+                services.Configure<DataProtectionTokenProviderOptions>(options => options.TokenLifespan = tokenLifespan.Value);
+            var provider = services.BuildServiceProvider();
+            var scope = provider.CreateScope();
+            var db = scope.ServiceProvider.GetRequiredService<JobTrackerContext>();
+            await db.Database.EnsureCreatedAsync();
+            return new Fixture(connection, provider, db, scope.ServiceProvider.GetRequiredService<UserManager<ApplicationUser>>())
+            {
+                _scope = scope,
+            };
+        }
+
+        private IServiceScope? _scope;
+
+        public async Task<ApplicationUser> CreateUserAsync(string email, string userName, bool confirmed)
+        {
+            var user = new ApplicationUser
+            {
+                Id = Guid.NewGuid().ToString("N"), UserName = userName, Email = email, EmailConfirmed = confirmed,
+            };
+            var created = await Users.CreateAsync(user, "Password123!");
+            Assert.True(created.Succeeded, string.Join("; ", created.Errors.Select(error => error.Description)));
+            return user;
+        }
+
+        public AuthController Controller()
+        {
+            var configuration = new ConfigurationBuilder().AddInMemoryCollection(new Dictionary<string, string?>
+            {
+                ["App:PublicBaseUrl"] = "https://jobs.example.test",
+            }).Build();
+            return new AuthController(
+                configuration,
+                Users,
+                Mock.Of<ITokenService>(),
+                _email.Object,
+                Mock.Of<IGoogleTokenValidator>(),
+                Mock.Of<IMicrosoftTokenValidator>(),
+                NullLogger<AuthController>.Instance,
+                Mock.Of<ITwoFactorPendingTokenService>(),
+                Db)
+            {
+                ControllerContext = new ControllerContext { HttpContext = new DefaultHttpContext() },
+            };
+        }
+
+        public async ValueTask DisposeAsync()
+        {
+            _scope?.Dispose();
+            await _provider.DisposeAsync();
+            await _connection.DisposeAsync();
+        }
+    }
+}

JobTrackerApi/Controllers/AuthController.cs

@@ -1019,7 +1019,7 @@ public sealed class AuthController : ControllerBase
         if (token.Length == 0) return BadRequest("Token is required.");
 
         var user = await _users.FindByIdAsync(userId);
-        if (user is null) return BadRequest("Invalid or expired link.");
+        if (user is null || user.EmailConfirmed) return BadRequest("Invalid or expired link.");
 
         var res = await _users.ConfirmEmailAsync(user, token);
         if (!res.Succeeded)

docs/audits/verification-log.md

@@ -213,3 +213,4 @@ Output was reduced to filenames and commit counts. The token artifact appears un
 | V-179 | Account-deletion real-SQLite failure/retry tests; sidecar token/cache tests; full backend; Compose validation | Repository root / `tools/summarizer` | Remove the live sidecar-cache and shared tombstone-path gaps without enabling deletion | PASS — lifecycle 6/6, backend 658/658, sidecar 23/23 and Compose config pass. Sidecar failure withholds completion/tombstone until retry; maintenance purge is token-protected; tombstones map to a separate named volume; activation defaults false | Synthetic rows/cache only; no production volume, deletion, restart, provider revocation, backup restore or retention decision | SEC-009 repository cache/storage boundary complete; production activation remains blocked |
 | V-180 | CV operation/store focused real-SQLite tests and full backend | Repository root | Keep dormant CV extraction history consistent with cancellation, deadline recovery and retry before worker claim | PASS — focused 17/17 and backend 660/660. Cancel sets the run terminal immediately, retry reopens it, deadline recovery fails it, and owner/task/subject predicates prevent unrelated updates | Synthetic rows only; no parser/model/MariaDB/production process interruption | AI-004 dormant-row consistency gap closed |
 | V-181 | AI usage meter/operation/workspace/export/deletion real-SQLite tests; EF model check; SQLite/MariaDB scripts; disposable SQLite backfill and fresh application startup; full backend | Repository root | Make Workspace and durable Strategy/CV usage owner-safe, idempotent and independent of deletable private history | PASS — focused 28/28 and backend 663/663; no pending model changes; both providers generate bounded additive DDL; SQLite backfills the synthetic legacy row exactly once; fresh runtime applies through `20260815175236_AddCrossFeatureAiUsage` and serves `/health` | Synthetic local rows only; no provider/model call, MariaDB server, production migration or worker activation. CV retains a conservative reservation and older synchronous AI paths are not yet universal | Main durable usage boundary implemented; remaining synchronous producers stay tracked under POL-001 |
+| V-182 | Real ASP.NET Identity data-protection token integration on SQLite; focused auth tests; full backend | Repository root | Close SEC-005B expiry/replay/custom-username proof without SMTP or production | PASS — valid confirmation succeeds once, replay and zero-lifetime expiry return the same generic failure, a real change-email token preserves a custom username and cannot replay; focused 39/39 and backend 666/666 | Synthetic addresses and ephemeral local data-protection keys only; no email, browser, MariaDB or production call | SEC-005B local token-state gap closed |

docs/verification/sec-005b-email-ownership.md

@@ -12,6 +12,7 @@ Status: `IMPLEMENTED — NOT VERIFIED`. Backend, frontend component, build, migr
 - Local accounts request a new address with their current password. The active address remains unchanged and both current and proposed addresses receive non-secret notifications.
 - `PendingEmail`, `PendingEmailRequestedAtUtc`, and a rotated security stamp make replacement requests invalidate older Identity change-email tokens.
 - Confirmation accepts only the current pending address, uses `UserManager.ChangeEmailAsync`, updates username only when it still tracks the old email, clears pending state, and revokes all sessions/trusted devices.
+- Registration verification links are single-use at the HTTP boundary; an already confirmed account receives the same generic invalid/expired response as an invalid token.
 - Cancellation requires the current password and clears pending state.
 - ASP.NET Identity default token providers are registered; data-protection keys already persist under `Data:Root/keys`.
 
@@ -29,6 +30,7 @@ Status: `IMPLEMENTED — NOT VERIFIED`. Backend, frontend component, build, migr
   - no `Set-Cookie` header and zero client cookies;
   - immediate login returned 403 `email_not_verified` and still zero cookies.
 - No email was sent and no production service or database was contacted.
+- Real ASP.NET Identity data-protection tokens against SQLite prove valid confirmation, replay rejection, expiry rejection, real change-email confirmation, replay rejection and custom-username preservation. Focused auth/token tests pass 39/39; full backend passes 666/666.
 
 ## Blocked or partial checks
 
@@ -56,6 +58,5 @@ dotnet run --no-build --no-launch-profile --project JobTrackerApi/JobTrackerApi.
 ## Remaining acceptance checks
 
 - Real-browser registration, resend, verification, email request, cancellation and confirmation using a local email sink.
-- Expired/replayed real Identity token integration check and custom-username preservation integration check.
 - Disposable MariaDB upgrade/rollback execution.
 - Production SMTP/canonical-origin and rolling-version smoke with synthetic addresses.

docs/work-programmes/master-work-plan.md

@@ -200,7 +200,7 @@ This queue records the highest-value work that can proceed without production cr
 - **Blocker:** in-app browser localhost access was denied by its admin policy check; no safe SMTP sink, disposable MariaDB, or production environment is available.
 - **Evidence:** `docs/verification/sec-005b-email-ownership.md`; focused backend 35/35; full backend 501/501; frontend 151/151 and build; SQLite upgrade and dual-provider migration scripts; isolated API 202/no-cookie and 403/no-cookie checks.
 - **Commit:** none.
-- **Remaining work:** real-browser desktop/mobile/keyboard flows with a local email sink; expired/replayed token and custom-username integration checks; disposable MariaDB migration execution; production SMTP/origin/version-skew verification before `DONE`.
+- **Remaining work:** real-browser desktop/mobile/keyboard flows with a local email sink; disposable MariaDB migration execution; production SMTP/origin/version-skew verification before `DONE`. Real Identity valid/expired/replayed verification and custom-username email-change behavior pass locally (V-182).
 
 ### SEC-006 — Compatible document-parser dependency update