# AdminUI Certificate Store Actions — Implementation Plan

> **For Claude:** REQUIRED SUB-SKILL: Use superpowers-extended-cc:executing-plans (here, subagent-driven-development) to implement this plan task-by-task.

**Goal:** Add FleetAdmin-gated trust / untrust / delete actions to the read-only
`/certificates` AdminUI page, backed by an in-process filesystem
`CertificateStoreManager`, honored live by the running cert validator.

**Architecture:** New `CertificateStoreManager` (pure BCL filesystem, by-thumbprint
moves/deletes on the PKI directory stores) injected into `Certificates.razor`,
which gains per-row action buttons (`<AuthorizeView Policy="FleetAdmin">`) with
inline Blazor confirmation. No new endpoint (avoids the Traefik self-dial trap),
no SDK store dependency, no EF/Commons/proto change.

**Tech Stack:** .NET 10, Blazor Server, BCL `X509CertificateLoader` /
`CertificateRequest`, xUnit + Shouldly. NO bUnit.

**Design:** `docs/plans/2026-06-18-adminui-cert-actions-design.md` (committed `f150460b`).

**Branch:** `feat/adminui-cert-actions` off master `8480e301`.

**Hard rules:** stage by explicit path (never `git add .`); never stage
`sql_login.txt`, `src/Server/ZB.MOM.WW.OtOpcUa.Host/pki/`, `pending.md`,
`current.md`, `stillpending.md`, `docker-dev/docker-compose.yml`; never echo/commit
secrets; no force-push; no `--no-verify`; NO EF migration; NO Commons wire/proto
change; NO bUnit; `dangerouslyDisableSandbox: true` for all build/test/rig commands.

---

### Task 1: `CertificateStoreManager` + tests (the load-bearing logic)

**Classification:** standard
**Estimated implement time:** ~5 min
**Parallelizable with:** none (Task 2 depends on the type)

**Files:**
- Create: `src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Certificates/CertificateStoreManager.cs`
- Test:   `tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/Certificates/CertificateStoreManagerTests.cs`

**Context:** This is greenfield — no cert-management code exists. A PKI directory
store is `{PkiStoreRoot}/{kind}/certs/*.{der,cer,crt}`. `kind` ∈
`{own, issuer, trusted, rejected}`; only `trusted` and `rejected` are mutated.
The class mirrors how `Certificates.razor` already reads certs (BCL
`X509CertificateLoader`, `Directory.EnumerateFiles`). Operations are synchronous,
find files by **enumerate-and-match-thumbprint** (never build a path from the
thumbprint), and return a `CertActionResult` instead of throwing.

**Step 1: Write the failing tests (TDD).**

`CertificateStoreManagerTests.cs` — xUnit + Shouldly. Use a per-test temp dir
(`Path.Combine(Path.GetTempPath(), "otopcua-certtests-" + Guid.NewGuid())`),
`IDisposable` cleanup. Helper to seed a cert:

```csharp
private static string SeedCert(string storeCertsDir, string cn)
{
    Directory.CreateDirectory(storeCertsDir);
    using var rsa = System.Security.Cryptography.RSA.Create(2048);
    var req = new System.Security.Cryptography.X509Certificates.CertificateRequest(
        $"CN={cn}", rsa, System.Security.Cryptography.HashAlgorithmName.SHA256,
        System.Security.Cryptography.RSASignaturePadding.Pkcs1);
    using var cert = req.CreateSelfSigned(DateTimeOffset.UtcNow.AddDays(-1), DateTimeOffset.UtcNow.AddYears(1));
    var file = Path.Combine(storeCertsDir, $"{cn} [{cert.Thumbprint}].der");
    File.WriteAllBytes(file, cert.Export(System.Security.Cryptography.X509Certificates.X509ContentType.Cert));
    return cert.Thumbprint!;
}
```

Tests (construct the manager via the `internal CertificateStoreManager(string pkiRoot)`
test ctor — the test project already has `InternalsVisibleTo` for AdminUI; if not,
add it in Task 1 to the AdminUI csproj):

- `Trust_MovesRejectedToTrusted`: seed in `rejected/certs`; `Trust(tp)` →
  `Success`; file gone from `rejected/certs`, present in `trusted/certs`
  (re-enumerate + match thumbprint to assert).
- `Untrust_MovesTrustedToRejected`: symmetric.
- `Delete_Rejected_RemovesFile` and `Delete_Trusted_RemovesFile`.
- `Trust_UnknownThumbprint_FailsNoChange`: `Trust("A0".PadRight(40,'B'))` (valid
  hex, not present) → `Success == false`, stores unchanged.
- `Trust_PathTraversalThumbprint_Rejected`: `Trust("../../x")` → `Fail`, no file
  created/moved anywhere.
- `Delete_DisallowedStore_Fails`: `Delete("own", tp)` → `Fail` (error mentions
  store), the `own` store untouched.
- `Trust_AlreadyInDest_IdempotentSuccess`: seed the SAME cert bytes in both
  `rejected/certs` and `trusted/certs`; `Trust(tp)` → `Success`, source removed,
  dest still has it.

**Step 2: Run tests, verify they fail to compile / fail.**

Run: `dotnet test tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests --filter "FullyQualifiedName~CertificateStoreManagerTests"`
Expected: FAIL (type does not exist yet).

**Step 3: Implement `CertificateStoreManager`.**

```csharp
using System.Security.Cryptography.X509Certificates;
using Microsoft.Extensions.Configuration;

namespace ZB.MOM.WW.OtOpcUa.AdminUI.Certificates;

/// <summary>Result of a certificate-store mutation; carries a friendly error instead of throwing.</summary>
public sealed record CertActionResult(bool Success, string? Error)
{
    public static CertActionResult Ok() => new(true, null);
    public static CertActionResult Fail(string error) => new(false, error);
}

/// <summary>
/// Trusts / untrusts / deletes peer certificates by moving or removing files in the
/// OPC UA server's PKI directory stores. The running server's DirectoryStore re-enumerates
/// <c>certs/</c> on each validation, so changes are honored live without a restart.
/// </summary>
public sealed class CertificateStoreManager
{
    private static readonly string[] CertExtensions = [".der", ".cer", ".crt"];
    private static readonly HashSet<string> MutableStores =
        new(StringComparer.OrdinalIgnoreCase) { "trusted", "rejected" };

    private readonly string _pkiRoot;

    /// <summary>Production ctor — reads <c>OpcUa:PkiStoreRoot</c> (default <c>pki</c>).</summary>
    public CertificateStoreManager(IConfiguration config)
        => _pkiRoot = config.GetValue<string?>("OpcUa:PkiStoreRoot") ?? "pki";

    /// <summary>Test ctor — explicit PKI root.</summary>
    internal CertificateStoreManager(string pkiRoot) => _pkiRoot = pkiRoot;

    /// <summary>Moves a rejected peer cert into the trusted store.</summary>
    public CertActionResult Trust(string thumbprint) => Move("rejected", "trusted", thumbprint);

    /// <summary>Moves a trusted peer cert back into the rejected store.</summary>
    public CertActionResult Untrust(string thumbprint) => Move("trusted", "rejected", thumbprint);

    /// <summary>Deletes a cert from the named mutable store (<c>trusted</c> or <c>rejected</c>).</summary>
    public CertActionResult Delete(string store, string thumbprint)
    {
        if (!MutableStores.Contains(store)) return CertActionResult.Fail($"unknown store '{store}'");
        if (!IsValidThumbprint(thumbprint)) return CertActionResult.Fail("invalid thumbprint");
        try
        {
            var file = FindByThumbprint(CertsDir(store), thumbprint);
            if (file is null) return CertActionResult.Fail($"certificate not found in {store}");
            File.Delete(file);
            return CertActionResult.Ok();
        }
        catch (Exception ex) when (ex is IOException or UnauthorizedAccessException)
        {
            return CertActionResult.Fail(ex.Message);
        }
    }

    private CertActionResult Move(string fromSub, string toSub, string thumbprint)
    {
        if (!IsValidThumbprint(thumbprint)) return CertActionResult.Fail("invalid thumbprint");
        try
        {
            var src = FindByThumbprint(CertsDir(fromSub), thumbprint);
            if (src is null) return CertActionResult.Fail($"certificate not found in {fromSub}");

            var destDir = CertsDir(toSub);
            Directory.CreateDirectory(destDir);

            // Idempotent: if dest already holds this thumbprint, just drop the source.
            if (FindByThumbprint(destDir, thumbprint) is not null)
            {
                File.Delete(src);
                return CertActionResult.Ok();
            }

            var dest = Path.Combine(destDir, Path.GetFileName(src));
            if (File.Exists(dest))
                dest = Path.Combine(destDir,
                    $"{Path.GetFileNameWithoutExtension(src)}_{thumbprint}{Path.GetExtension(src)}");
            File.Move(src, dest);
            return CertActionResult.Ok();
        }
        catch (Exception ex) when (ex is IOException or UnauthorizedAccessException)
        {
            return CertActionResult.Fail(ex.Message);
        }
    }

    private string CertsDir(string sub) => Path.Combine(_pkiRoot, sub, "certs");

    private static string? FindByThumbprint(string certsDir, string thumbprint)
    {
        if (!Directory.Exists(certsDir)) return null;
        foreach (var file in Directory.EnumerateFiles(certsDir))
        {
            if (!CertExtensions.Contains(Path.GetExtension(file), StringComparer.OrdinalIgnoreCase)) continue;
            try
            {
                using var cert = X509CertificateLoader.LoadCertificateFromFile(file);
                if (string.Equals(cert.Thumbprint, thumbprint, StringComparison.OrdinalIgnoreCase))
                    return file;
            }
            catch { /* ignore unreadable entries */ }
        }
        return null;
    }

    private static bool IsValidThumbprint(string thumbprint) =>
        !string.IsNullOrEmpty(thumbprint)
        && (thumbprint.Length == 40 || thumbprint.Length == 64)
        && thumbprint.All(Uri.IsHexDigit);
}
```

If the AdminUI.Tests project lacks `InternalsVisibleTo` for the AdminUI assembly,
add `<InternalsVisibleTo Include="ZB.MOM.WW.OtOpcUa.AdminUI.Tests" />` via an
`<ItemGroup>` in the AdminUI `.csproj` (check first — many projects in this repo
already have it).

**Step 4: Run tests, verify green.**

Run: `dotnet test tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests --filter "FullyQualifiedName~CertificateStoreManagerTests"`
Expected: PASS (all 9).

**Step 5: Commit.**

```bash
git add src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Certificates/CertificateStoreManager.cs \
        tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/Certificates/CertificateStoreManagerTests.cs
# (+ the AdminUI .csproj only if you added InternalsVisibleTo)
git commit -m "feat(adminui): CertificateStoreManager — by-thumbprint trust/untrust/delete"
```

---

### Task 2: Wire actions into `Certificates.razor` + DI registration

**Classification:** standard
**Estimated implement time:** ~5 min
**Parallelizable with:** none (depends on Task 1's type)

**Files:**
- Modify: `src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Pages/Certificates.razor`
- Modify: `src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/EndpointRouteBuilderExtensions.cs`

**Context:** The page (read it fully first) renders four stores in `OnInitialized`
via `LoadStore(label, path)` → `StoreView(Label, Path, List<X509Certificate2>)`.
Add a store **kind** so the table knows which rows get actions; add an Actions
column gated by `<AuthorizeView Policy="FleetAdmin">`; add inline confirmation
(NO `window.confirm`); call the injected `CertificateStoreManager`.

**Step 1: Register the service in DI.**

In `EndpointRouteBuilderExtensions.AddAdminUI`, after the ScriptAnalysis
registrations, add:

```csharp
// Certificate-store actions (trust/untrust/delete) for the /certificates page.
services.AddSingleton<Certificates.CertificateStoreManager>();
```

**Step 2: Modify `Certificates.razor`.**

Add the inject + an enum, tag each `StoreView` with its kind, render an Actions
column, and handle the confirm flow. Concrete changes:

- Header block: add `@inject Certificates.CertificateStoreManager CertManager`.
- Replace the `StoreView` record with one carrying a kind:

```csharp
private enum StoreKind { Own, Trusted, Issuer, Rejected }
private sealed record StoreView(string Label, StoreKind Kind, string Path, List<X509Certificate2> Certificates);
```

- Refactor `OnInitialized()` into `LoadAll()` and call it from `OnInitialized()`:

```csharp
protected override void OnInitialized() => LoadAll();

private void LoadAll()
{
    var pkiRoot = Config.GetValue<string?>("OpcUa:PkiStoreRoot") ?? "pki";
    _rows = new()
    {
        LoadStore("Own", StoreKind.Own, Path.Combine(pkiRoot, "own", "certs")),
        LoadStore("Trusted peers", StoreKind.Trusted, Path.Combine(pkiRoot, "trusted", "certs")),
        LoadStore("Trusted issuers", StoreKind.Issuer, Path.Combine(pkiRoot, "issuer", "certs")),
        LoadStore("Rejected", StoreKind.Rejected, Path.Combine(pkiRoot, "rejected", "certs")),
    };
    _pending = null;
}
```
(update `LoadStore` signature to take `StoreKind kind` and pass it into `StoreView`.)

- Add fields + the action/confirm handlers in `@code`:

```csharp
private (StoreKind Kind, string Thumbprint, string Subject, string Verb)? _pending;
private string? _statusMsg;
private bool _statusError;

private void RequestAction(StoreKind kind, X509Certificate2 cert, string verb)
{
    _pending = (kind, cert.Thumbprint!, cert.Subject, verb);
    _statusMsg = null;
}

private void CancelAction() => _pending = null;

private void ConfirmAction()
{
    if (_pending is not { } p) return;
    var result = p.Verb switch
    {
        "trust"   => CertManager.Trust(p.Thumbprint),
        "untrust" => CertManager.Untrust(p.Thumbprint),
        "delete"  => CertManager.Delete(p.Kind == StoreKind.Trusted ? "trusted" : "rejected", p.Thumbprint),
        _         => CertActionResult.Fail("unknown action"),
    };
    _statusError = !result.Success;
    _statusMsg = result.Success
        ? $"{char.ToUpper(p.Verb[0])}{p.Verb[1..]} of {p.Subject} succeeded."
        : $"{p.Verb} failed: {result.Error}";
    LoadAll(); // clears _pending
}
```

- In the table, add an `Actions` header + cell. Render the cell's buttons only for
  `Trusted`/`Rejected` and only inside `<AuthorizeView Policy="FleetAdmin">`:

```razor
@if (store.Kind is StoreKind.Trusted or StoreKind.Rejected)
{
    <AuthorizeView Policy="FleetAdmin">
        <td>
            @if (store.Kind == StoreKind.Rejected)
            {
                <button class="btn-sm" @onclick="() => RequestAction(store.Kind, c, \"trust\")">Trust</button>
            }
            else
            {
                <button class="btn-sm" @onclick="() => RequestAction(store.Kind, c, \"untrust\")">Untrust</button>
            }
            <button class="btn-sm danger" @onclick="() => RequestAction(store.Kind, c, \"delete\")">Delete</button>
        </td>
    </AuthorizeView>
}
```

(Match the existing CSS classes used elsewhere in AdminUI — inspect a sibling page
for the real button class names, e.g. `btn`, `btn-danger`; keep it minimal and
consistent. The `Actions` `<th>` should also be inside an `AuthorizeView` or
always-present — simplest: always render the `<th>Actions</th>` for trusted/rejected
tables and an empty `<td>` for non-admins.)

- Add the inline confirm + status banner near the top of the `else` block (after
  the intro panel), e.g.:

```razor
@if (_statusMsg is not null)
{
    <div class="panel @(_statusError ? "error" : "notice")">@_statusMsg</div>
}
@if (_pending is { } p)
{
    <div class="panel notice">
        Confirm <strong>@p.Verb</strong> of <span class="mono small">@p.Subject</span>?
        <button class="btn-sm" @onclick="ConfirmAction">Confirm</button>
        <button class="btn-sm" @onclick="CancelAction">Cancel</button>
    </div>
}
```

**Step 3: Build.**

Run: `dotnet build src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/ZB.MOM.WW.OtOpcUa.AdminUI.csproj`
Expected: 0 errors. (Razor compiles; no unit test — bUnit is not used.)

**Step 4: Commit.**

```bash
git add src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Pages/Certificates.razor \
        src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/EndpointRouteBuilderExtensions.cs
git commit -m "feat(adminui): trust/untrust/delete actions on /certificates (FleetAdmin)"
```

---

### Task 3: Docs + full build + AdminUI test suite + live `/run` verify + finish

**Classification:** small
**Estimated implement time:** ~4 min (+ live verify)
**Parallelizable with:** none

**Files:**
- Modify: `docs/security.md` (one-paragraph note on the cert-store actions)

**Step 1: Doc note.** Add a short subsection to `docs/security.md` under the cert /
PKI material: the `/certificates` page now offers FleetAdmin-gated Trust (rejected→
trusted), Untrust (trusted→rejected), and Delete; changes are filesystem moves on
the PKI directory stores and are honored live by the validator.

**Step 2: Full solution build.**

Run: `dotnet build ZB.MOM.WW.OtOpcUa.slnx`
Expected: 0 errors.

**Step 3: AdminUI test suite (no regressions).**

Run: `dotnet test tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests`
Expected: all green (existing + 9 new).

**Step 4: Live `/run` verify (controller does this — login is disabled on the rig).**

- Pick ONE central container (e.g. `otopcua-dev-central-1-1`); rebuild it if the
  AdminUI changed (per the durable rig fact, `:9200` round-robins central-1/2 — to
  avoid old/new flicker, rebuild BOTH, or pin the browser to a single node).
- Seed a self-signed DER into that node's `rejected/certs/` (generate locally,
  `docker cp`/`docker exec` into the container's PKI rejected dir; confirm the
  store path from the container's appsettings `OpcUa:PkiStoreRoot`).
- Open `http://localhost:9200/certificates` (Chrome automation), confirm the seeded
  cert shows under **Rejected** with `[Trust] [Delete]`.
- Click `[Trust]` → `[Confirm]`; confirm the success banner, the cert now under
  **Trusted peers**, gone from **Rejected** (and `docker exec ls` shows the file
  moved on disk).
- Click `[Delete]` → `[Confirm]` on a cert; confirm removal.

**Step 5: Finish (merge to master + push).**

Use superpowers-extended-cc:finishing-a-development-branch. Per standing cadence:
merge `feat/adminui-cert-actions` → master, push to origin, delete the branch.
Stage by path; never stage the never-stage files.

```bash
git add docs/security.md
git commit -m "docs(security): note cert-store trust/untrust/delete actions"
git checkout master && git merge --ff-only feat/adminui-cert-actions && git push origin master
git branch -d feat/adminui-cert-actions
```

---

## Task dependency graph

```
T1 (manager + tests)  →  T2 (razor + DI)  →  T3 (docs + build + tests + /run + finish)
```

All serial — T2 needs T1's type; T3 verifies the whole.