fix(secrets): audit low-trust user-secret omissions

Record a value-free binding_not_allowed access event when an inherited user-secret declaration is omitted, and classify company-secret denials consistently.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

server/src/__tests__/secrets-service.test.ts

@@ -1558,6 +1558,16 @@ describeEmbeddedPostgres("secretService", () => {
     expect(resolved.manifest).toEqual([]);
     expect(JSON.stringify(resolved)).not.toContain("aral-bp-invoices");
 
+    const [denialEvent] = await svc.listAccessEvents(companyId, secret.id);
+    expect(denialEvent).toMatchObject({
+      consumerType: "project",
+      consumerId: "project-1",
+      configPath: "env.ARAL_BP_RECHNUNGEN",
+      outcome: "failure",
+      errorCode: "binding_not_allowed",
+    });
+    expect(JSON.stringify(denialEvent)).not.toContain("aral-bp-invoices");
+
     // Without the opt-in the same call still hard-fails — omission is
     // per-call, not a change to the default enforcement.
     await expect(
@@ -1666,7 +1676,7 @@ describeEmbeddedPostgres("secretService", () => {
     const companyId = await seedCompany();
     await seedCompanyMember(companyId, "user-1", "owner");
     const svc = secretService(db);
-    await svc.createUserSecretDefinition(companyId, {
+    const definition = await svc.createUserSecretDefinition(companyId, {
       key: "github_token",
       name: "GitHub token",
       provider: "local_encrypted",
@@ -1698,6 +1708,28 @@ describeEmbeddedPostgres("secretService", () => {
     expect(resolved.env).toEqual({ ROUTINE_PLAIN: "still-here" });
     expect(resolved.secretKeys.has("GITHUB_TOKEN")).toBe(false);
     expect(JSON.stringify(resolved)).not.toContain("user-one-secret");
+
+    const [denialEvent] = await db
+      .select()
+      .from(secretAccessEvents)
+      .where(and(
+        eq(secretAccessEvents.companyId, companyId),
+        eq(secretAccessEvents.userSecretDefinitionId, definition.id),
+      ));
+    expect(denialEvent).toMatchObject({
+      secretId: null,
+      secretScope: "user",
+      responsibleUserId: "user-1",
+      credentialOwnerUserId: "user-1",
+      credentialSubjectType: "user",
+      credentialSubjectId: "user-1",
+      consumerType: "routine",
+      consumerId: "routine-1",
+      configPath: "env.GITHUB_TOKEN",
+      outcome: "failure",
+      errorCode: "binding_not_allowed",
+    });
+    expect(JSON.stringify(denialEvent)).not.toContain("user-one-secret");
   });
 
   it("resolves routine env secret refs through routine bindings and records value-free access metadata", async () => {

server/src/services/secrets.ts

@@ -712,6 +712,7 @@ type RuntimeSecretResolution = {
 };
 
 type SecretResolutionErrorCode =
+  | "binding_not_allowed"
   | "binding_missing"
   | "secret_deleted"
   | "secret_inactive"
@@ -822,6 +823,7 @@ function secretResolutionErrorCode(error: unknown): SecretResolutionErrorCode {
   if (error instanceof HttpError) {
     const details = asRecord(error.details);
     switch (details?.code) {
+      case "binding_not_allowed":
       case "binding_missing":
       case "secret_deleted":
       case "secret_inactive":
@@ -1155,7 +1157,7 @@ export function secretService(db: Db | DbTransaction) {
 
   async function recordAccessEvent(input: {
     companyId: string;
-    secretId: string;
+    secretId: string | null;
     userSecretDefinitionId?: string | null;
     secretScope?: string | null;
     version: number | null;
@@ -4166,6 +4168,20 @@ export function secretService(db: Db | DbTransaction) {
         Array.isArray(context?.allowedBindingIds) &&
         (!declaration || !context.allowedBindingIds.includes(declaration.id))
       ) {
+        await recordAccessEvent({
+          companyId,
+          secretId: null,
+          userSecretDefinitionId: definition.id,
+          secretScope: "user",
+          version: null,
+          provider: definition.provider as SecretProvider,
+          context: context ? { ...context, responsibleUserId } : undefined,
+          credentialOwnerUserId: responsibleUserId,
+          credentialSubjectType: "user",
+          credentialSubjectId: responsibleUserId,
+          outcome: "failure",
+          errorCode: "binding_not_allowed",
+        }).catch(() => undefined);
         throw unprocessable(
           "User secret declaration is outside the active low-trust boundary",
           { code: "binding_not_allowed" },