feat(mesh-phase5): fail-closed bearer interceptor for the telemetry stream
Claude-Session: https://claude.ai/code/session_01GASWkNEi68FSCtvr6rLoEW
This commit is contained in:
Joseph Doherty
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using Grpc.Core;
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using Microsoft.Extensions.Logging.Abstractions;
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using Microsoft.Extensions.Options;
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using Shouldly;
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using Xunit;
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using ZB.MOM.WW.OtOpcUa.Cluster;
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using ZB.MOM.WW.OtOpcUa.Host.Configuration;
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namespace ZB.MOM.WW.OtOpcUa.Host.Tests.Configuration;
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/// <summary>
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/// Per-cluster mesh Phase 5 — the telemetry stream endpoint's inbound gate. Wiring this
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/// interceptor into the <c>AddGrpc</c> pipeline + Kestrel is a separate, later task; this test
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/// covers only the interceptor's own authorization behavior.
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/// </summary>
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/// <remarks>
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/// Same contract as <see cref="ConfigServeAuthInterceptor"/> / <see cref="LocalDbSyncAuthInterceptor"/>,
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/// scoped to <c>/telemetry.v1.TelemetryStreamService/</c> — fail-closed on an unconfigured key,
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/// constant-time comparison, gated on every handler shape so scoping holds regardless of RPC shape.
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/// </remarks>
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public sealed class TelemetryStreamAuthInterceptorTests
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{
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private const string SubscribeMethod = "/telemetry.v1.TelemetryStreamService/Subscribe";
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private const string OtherMethod = "/deployment_artifact.v1.DeploymentArtifactService/Fetch";
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private static TelemetryStreamAuthInterceptor CreateInterceptor(string? apiKey)
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=> new(
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Options.Create(new TelemetryOptions { ApiKey = apiKey ?? string.Empty }),
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NullLogger<TelemetryStreamAuthInterceptor>.Instance);
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private static ServerCallContext CreateContext(string method, string? authorizationHeader)
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{
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var headers = new Metadata();
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if (authorizationHeader is not null)
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headers.Add("authorization", authorizationHeader);
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return new FakeServerCallContext(method, headers);
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}
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/// <summary>Invokes the interceptor's server-streaming path (how <c>Subscribe</c> actually runs).</summary>
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private static Task Invoke(TelemetryStreamAuthInterceptor interceptor, ServerCallContext context)
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=> interceptor.ServerStreamingServerHandler<string, string>(
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"request", responseStream: null!, context, (_, _, _) => Task.CompletedTask);
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[Fact]
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public async Task NonTelemetryMethod_PassesThrough_EvenWithNoKeyConfigured()
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{
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// The interceptor shares the AddGrpc pipeline with other gRPC services, so it sees every
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// call. It must be scoped strictly to the telemetry service.
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var interceptor = CreateInterceptor(apiKey: null);
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var context = CreateContext(OtherMethod, authorizationHeader: null);
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await Invoke(interceptor, context); // no throw
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}
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[Fact]
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public async Task SubscribeMethod_WithNoKeyConfigured_IsDenied_EvenWithABearerToken()
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{
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// Fail-closed. "No key configured" is the DEFAULT — treating it as "no auth required" would
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// expose live telemetry on exactly the shape most nodes ship with. A token must not help.
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var interceptor = CreateInterceptor(apiKey: null);
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var context = CreateContext(SubscribeMethod, "Bearer anything-at-all");
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var ex = await Should.ThrowAsync<RpcException>(() => Invoke(interceptor, context));
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ex.StatusCode.ShouldBe(StatusCode.PermissionDenied);
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}
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[Fact]
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public async Task SubscribeMethod_WithNoBearerToken_IsDenied()
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{
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var interceptor = CreateInterceptor("the-shared-key");
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var context = CreateContext(SubscribeMethod, authorizationHeader: null);
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var ex = await Should.ThrowAsync<RpcException>(() => Invoke(interceptor, context));
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ex.StatusCode.ShouldBe(StatusCode.PermissionDenied);
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}
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[Fact]
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public async Task SubscribeMethod_WithMalformedAuthorizationHeader_IsDenied()
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{
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// No "Bearer " prefix at all — must be treated the same as a missing header.
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var interceptor = CreateInterceptor("the-shared-key");
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var context = CreateContext(SubscribeMethod, "the-shared-key");
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var ex = await Should.ThrowAsync<RpcException>(() => Invoke(interceptor, context));
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ex.StatusCode.ShouldBe(StatusCode.PermissionDenied);
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}
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[Fact]
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public async Task SubscribeMethod_WithWrongBearerToken_IsDenied()
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{
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var interceptor = CreateInterceptor("the-shared-key");
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var context = CreateContext(SubscribeMethod, "Bearer the-wrong-key");
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var ex = await Should.ThrowAsync<RpcException>(() => Invoke(interceptor, context));
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ex.StatusCode.ShouldBe(StatusCode.PermissionDenied);
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}
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[Fact]
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public async Task SubscribeMethod_WithCorrectBearerToken_PassesThrough()
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{
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var interceptor = CreateInterceptor("the-shared-key");
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var context = CreateContext(SubscribeMethod, "Bearer the-shared-key");
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await Invoke(interceptor, context); // no throw
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}
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[Fact]
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public async Task SubscribeMethod_TokenComparison_IsNotAPrefixMatch()
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{
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// A prefix/StartsWith comparison would accept a truncated key and make the secret
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// recoverable one character at a time.
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var interceptor = CreateInterceptor("the-shared-key");
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var context = CreateContext(SubscribeMethod, "Bearer the-shared-ke");
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var ex = await Should.ThrowAsync<RpcException>(() => Invoke(interceptor, context));
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ex.StatusCode.ShouldBe(StatusCode.PermissionDenied);
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}
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[Fact]
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public async Task UnaryPath_IsAlsoGated()
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{
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// Subscribe is server-streaming today, but gating only that path would leave any future
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// unary method on the same service open. Gate every handler shape.
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var interceptor = CreateInterceptor("the-shared-key");
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var context = CreateContext(SubscribeMethod, "Bearer the-wrong-key");
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var ex = await Should.ThrowAsync<RpcException>(() =>
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interceptor.UnaryServerHandler<string, string>(
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"request", context, (_, _) => Task.FromResult("ok")));
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ex.StatusCode.ShouldBe(StatusCode.PermissionDenied);
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}
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[Fact]
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public async Task ClientStreamingPath_IsAlsoGated()
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{
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var interceptor = CreateInterceptor("the-shared-key");
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var context = CreateContext(SubscribeMethod, "Bearer the-wrong-key");
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var ex = await Should.ThrowAsync<RpcException>(() =>
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interceptor.ClientStreamingServerHandler<string, string>(
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requestStream: null!, context, (_, _) => Task.FromResult("ok")));
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ex.StatusCode.ShouldBe(StatusCode.PermissionDenied);
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}
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[Fact]
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public async Task DuplexStreamingPath_IsAlsoGated()
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{
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var interceptor = CreateInterceptor("the-shared-key");
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var context = CreateContext(SubscribeMethod, "Bearer the-wrong-key");
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var ex = await Should.ThrowAsync<RpcException>(() =>
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interceptor.DuplexStreamingServerHandler<string, string>(
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requestStream: null!, responseStream: null!, context, (_, _, _) => Task.CompletedTask));
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ex.StatusCode.ShouldBe(StatusCode.PermissionDenied);
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}
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[Fact]
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public void HasExactlyOnePublicConstructor()
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{
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// Grpc.AspNetCore silently stops invoking an interceptor with more than one public ctor —
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// this pins the shape so a well-meaning overload doesn't quietly disable auth in production.
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var publicCtors = typeof(TelemetryStreamAuthInterceptor).GetConstructors();
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publicCtors.Length.ShouldBe(1);
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}
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/// <summary>
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/// Minimal <see cref="ServerCallContext"/> carrying just a method name and request headers —
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/// the only two things the interceptor reads. Hand-rolled because
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/// <c>Grpc.Core.Testing.TestServerCallContext</c> ships only in the retired native package.
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/// </summary>
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private sealed class FakeServerCallContext(string method, Metadata requestHeaders)
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: ServerCallContext
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{
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protected override string MethodCore => method;
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protected override string HostCore => "localhost";
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protected override string PeerCore => "ipv4:127.0.0.1:12345";
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protected override DateTime DeadlineCore => DateTime.UtcNow.AddMinutes(1);
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protected override Metadata RequestHeadersCore => requestHeaders;
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protected override CancellationToken CancellationTokenCore => CancellationToken.None;
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protected override Metadata ResponseTrailersCore { get; } = [];
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protected override Status StatusCore { get; set; }
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protected override WriteOptions? WriteOptionsCore { get; set; }
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protected override AuthContext AuthContextCore { get; } =
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new(null, new Dictionary<string, List<AuthProperty>>());
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protected override ContextPropagationToken CreatePropagationTokenCore(
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ContextPropagationOptions? options)
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=> throw new NotSupportedException();
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protected override Task WriteResponseHeadersAsyncCore(Metadata responseHeaders)
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=> Task.CompletedTask;
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}
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}
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