passepartout/org/security-vault.org

#+TITLE: SKILL: Credentials Vault (org-skill-credentials-vault.org)
#+AUTHOR: Agent
#+FILETAGS: :system:security:vault:
#+PROPERTY: header-args:lisp :tangle /home/user/.local/share/passepartout/lisp/security-vault.lisp

* Overview
The *Credentials Vault* provides secure in-memory storage for sensitive API keys and session tokens.

* Architectural Intent

The Credentials Vault isolates secrets from the rest of the system in
a dedicated hash-table. It provides simple get/set primitives with
environment-variable fallback for known providers. This is the single
place where credentials enter the system — every provider skill routes
through here.

** Contract

1. (vault-set provider secret &key type): stores secret under
   ~(format nil "~a-~a" provider type)~ in ~*vault-memory*~.
2. (vault-get provider &key type): returns the stored secret, or falls
   back to the appropriate environment variable for known providers
   (~:openai~, ~:anthropic~, ~:openrouter~, ~:gemini~). Returns NIL
   if neither exists.
3. (vault-get-secret provider): wrapper — calls ~vault-get~ with
   ~:type :secret~.
4. (vault-set-secret provider secret): wrapper — calls ~vault-set~
   with ~:type :secret~.
5. Vault isolation: storing a secret for provider A does not affect
   provider B's entry. Different ~:type~ values produce different keys.

** Boundaries

- Does NOT encrypt at rest — that is the session layer's responsibility.
- Does NOT validate key format — the provider skill does that.
- Does NOT rotate or expire keys — this is a simple store.

* Implementation

** Package Context
#+begin_src lisp
(in-package :passepartout)
#+end_src

** Vault Storage
;; REPL-VERIFIED: 2026-05-03T13:00:00
#+begin_src lisp
(defvar *vault-memory* (make-hash-table :test 'equal)
  "In-memory cache of sensitive credentials.")
#+end_src

** Secret Management
;; REPL-VERIFIED: 2026-05-03T13:00:00
#+begin_src lisp
(defun vault-get (provider &key (type :api-key))
  "Retrieves a credential from the vault or environment."
  (let* ((key (format nil "~a-~a" provider type))
         (val (gethash key *vault-memory*)))
    (if val
        val
        (let ((env-var (case provider
                          (:gemini "GEMINI_API_KEY")
                          (:openai "OPENAI_API_KEY")
                          (:anthropic "ANTHROPIC_API_KEY")
                          (:openrouter "OPENROUTER_API_KEY")
                          (otherwise nil))))
          (when env-var (uiop:getenv env-var))))))

#+end_src
** vault-set
;; REPL-VERIFIED: 2026-05-03T13:00:00
#+begin_src lisp
(defun vault-set (provider secret &key (type :api-key))
  "Stores a secret in the vault."
  (let ((key (format nil "~a-~a" provider type)))
    (setf (gethash key *vault-memory*) secret)))
#+end_src

** Secret Wrappers (gateway-messaging)

Thin wrappers that match the export names used by =gateway-messaging=.
Delegates to the existing =vault-get=/=vault-set= with ~:type :secret~.

;; REPL-VERIFIED: 2026-05-03T13:00:00
#+begin_src lisp
(defun vault-get-secret (provider)
  "Retrieves a stored secret or token for a gateway provider."
  (vault-get provider :type :secret))

#+end_src
** vault-set-secret
;; REPL-VERIFIED: 2026-05-03T13:00:00
#+begin_src lisp
(defun vault-set-secret (provider secret)
  "Stores a secret or token for a gateway provider."
  (vault-set provider secret :type :secret))
#+end_src

** Skill Registration
#+begin_src lisp
(defskill :passepartout-security-vault
  :priority 600
  :trigger (lambda (ctx) (declare (ignore ctx)) nil))
#+end_src

* Test Suite

#+begin_src lisp
(eval-when (:compile-toplevel :load-toplevel :execute)
  (ql:quickload :fiveam :silent t))

(defpackage :passepartout-security-vault-tests
  (:use :cl :fiveam :passepartout)
  (:export #:vault-suite))

(in-package :passepartout-security-vault-tests)

(def-suite vault-suite :description "Verification of the Credentials Vault")
(in-suite vault-suite)

(test test-vault-round-trip
  "Contract 1: vault-set stores a value; vault-get retrieves it."
  (let ((test-key :vault-test-round-trip)
        (test-secret "secret-abc123"))
    (vault-set test-key test-secret)
    (is (string= test-secret (vault-get test-key)))
    ;; Clean up
    (vault-set test-key nil)))

(test test-vault-missing-key
  "Contract 2: vault-get returns NIL for an unset, unknown provider."
  (is (null (vault-get :nonexistent-provider-xyz))))

(test test-vault-isolation
  "Contract 5: storing for provider A does not affect provider B."
  (vault-set :vault-prov-a "secret-a")
  (vault-set :vault-prov-b "secret-b")
  (is (string= "secret-a" (vault-get :vault-prov-a)))
  (is (string= "secret-b" (vault-get :vault-prov-b)))
  (vault-set :vault-prov-a nil)
  (vault-set :vault-prov-b nil))

(test test-vault-secret-wrappers
  "Contracts 3,4: vault-get-secret and vault-set-secret use :type :secret."
  (let ((test-provider :vault-secret-test))
    (vault-set-secret test-provider "my-token")
    (is (string= "my-token" (vault-get-secret test-provider)))
    ;; Clean up
    (vault-set-secret test-provider nil)))

(test test-vault-type-isolation
  "Contract 5: different :type values produce different keys."
  (vault-set :vault-type-test "key-value" :type :api-key)
  (vault-set :vault-type-test "secret-value" :type :secret)
  (is (string= "key-value" (vault-get :vault-type-test :type :api-key)))
  (is (string= "secret-value" (vault-get :vault-type-test :type :secret)))
  (vault-set :vault-type-test nil :type :api-key)
  (vault-set :vault-type-test nil :type :secret))
#+end_src