Compare commits
1
Commits
| Author | SHA1 | Date | |
|---|---|---|---|
|
|
1bfb2efd94 |
@@ -0,0 +1,97 @@
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package audit
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import (
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"context"
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"fmt"
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"os"
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"testing"
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"time"
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"github.com/jackc/pgx/v5/pgxpool"
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)
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func setupAppendOnlyTest(t *testing.T) (*Log, *pgxpool.Pool, func()) {
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t.Helper()
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adminDSN := os.Getenv("TEST_ADMIN_DSN")
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if adminDSN == "" {
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t.Skip("TEST_ADMIN_DSN nicht gesetzt, Integrationstest uebersprungen")
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}
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ctx := context.Background()
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pool, err := pgxpool.New(ctx, adminDSN)
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if err != nil {
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t.Fatalf("pool: %v", err)
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}
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if _, err := pool.Exec(ctx, `
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CREATE TABLE IF NOT EXISTS audit_events (
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id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
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occurred_at TIMESTAMPTZ NOT NULL DEFAULT now(),
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tenant_slug TEXT NOT NULL CHECK (tenant_slug <> ''),
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actor TEXT NOT NULL CHECK (actor <> ''),
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action TEXT NOT NULL CHECK (action <> ''),
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target TEXT NOT NULL,
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metadata JSONB NOT NULL DEFAULT '{}'::jsonb
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);
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CREATE OR REPLACE FUNCTION audit_events_prevent_mutation() RETURNS TRIGGER AS $$
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BEGIN
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RAISE EXCEPTION 'audit_events ist append-only: % ist nicht erlaubt', TG_OP;
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END;
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$$ LANGUAGE plpgsql;
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DROP TRIGGER IF EXISTS audit_events_no_update ON audit_events;
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CREATE TRIGGER audit_events_no_update
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BEFORE UPDATE ON audit_events
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FOR EACH ROW EXECUTE FUNCTION audit_events_prevent_mutation();
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DROP TRIGGER IF EXISTS audit_events_no_delete ON audit_events;
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CREATE TRIGGER audit_events_no_delete
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BEFORE DELETE ON audit_events
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FOR EACH ROW EXECUTE FUNCTION audit_events_prevent_mutation();
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`); err != nil {
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t.Fatalf("schema: %v", err)
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}
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cleanup := func() {
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pool.Close()
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}
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return NewLog(pool), pool, cleanup
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}
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// Akzeptanzkriterium 1 + Pruefung 1: direkter UPDATE/DELETE-Versuch wird von
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// der Datenbank abgewiesen.
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func TestAppendOnly_RejectsUpdateAndDelete(t *testing.T) {
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log, pool, cleanup := setupAppendOnlyTest(t)
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defer cleanup()
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ctx := context.Background()
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// Append-only bedeutet: dieser Testeintrag kann NIE wieder geloescht
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// werden, auch nicht vom Test selbst. Eindeutiger Tenant-Slug pro Lauf,
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// damit wiederholte Testlaeufe sich nicht gegenseitig die Zaehlung
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// verfaelschen.
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tenantSlug := fmt.Sprintf("test_appendonly_%d", time.Now().UnixNano())
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if err := log.Record(ctx, Event{
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TenantSlug: tenantSlug,
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Actor: "alice",
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Action: "test.event",
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Target: "x",
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}); err != nil {
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t.Fatalf("record: %v", err)
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}
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_, err := pool.Exec(ctx, `UPDATE audit_events SET actor = 'mallory' WHERE tenant_slug = $1`, tenantSlug)
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if err == nil {
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t.Fatal("erwartet fehler bei UPDATE auf audit_events, habe nil")
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}
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_, err = pool.Exec(ctx, `DELETE FROM audit_events WHERE tenant_slug = $1`, tenantSlug)
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if err == nil {
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t.Fatal("erwartet fehler bei DELETE auf audit_events, habe nil")
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}
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count, err := log.CountByTenant(ctx, tenantSlug)
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if err != nil {
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t.Fatalf("count: %v", err)
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}
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if count != 1 {
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t.Fatalf("eintrag haette trotz fehlgeschlagener update/delete-versuche erhalten bleiben muessen, count=%d", count)
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}
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}
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@@ -3,8 +3,10 @@ package audit
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import (
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"context"
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"errors"
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"fmt"
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"os"
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"testing"
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"time"
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"github.com/jackc/pgx/v5/pgxpool"
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)
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@@ -48,8 +50,13 @@ func TestRecord_PersistsExactlyOneEventPerSecurityIncident(t *testing.T) {
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defer cleanup()
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ctx := context.Background()
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// Seit AUD-02 ist audit_events append-only — Zeilen koennen nie wieder
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// geloescht werden (auch nicht vom Test-Cleanup). Eindeutiger Slug pro
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// Lauf, damit wiederholte Testlaeufe die Zaehlung nicht verfaelschen.
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tenantSlug := "test_acme_" + fmt.Sprint(time.Now().UnixNano())
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err := log.Record(ctx, Event{
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TenantSlug: "test_acme",
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TenantSlug: tenantSlug,
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Actor: "alice@example.com",
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Action: "iam.login_failed",
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Target: "user:alice@example.com",
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@@ -59,7 +66,7 @@ func TestRecord_PersistsExactlyOneEventPerSecurityIncident(t *testing.T) {
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t.Fatalf("record: %v", err)
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}
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count, err := log.CountByTenant(ctx, "test_acme")
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count, err := log.CountByTenant(ctx, tenantSlug)
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if err != nil {
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t.Fatalf("count: %v", err)
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}
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@@ -69,8 +76,8 @@ func TestRecord_PersistsExactlyOneEventPerSecurityIncident(t *testing.T) {
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var actor, action, target string
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if err := pool.QueryRow(ctx, `
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SELECT actor, action, target FROM audit_events WHERE tenant_slug = 'test_acme'
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`).Scan(&actor, &action, &target); err != nil {
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SELECT actor, action, target FROM audit_events WHERE tenant_slug = $1
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`, tenantSlug).Scan(&actor, &action, &target); err != nil {
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t.Fatalf("eintrag lesen: %v", err)
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}
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if actor != "alice@example.com" || action != "iam.login_failed" || target != "user:alice@example.com" {
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@@ -0,0 +1,120 @@
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package audit
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import (
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"context"
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"crypto/rand"
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"crypto/sha256"
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"encoding/hex"
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"errors"
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"fmt"
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"github.com/jackc/pgx/v5"
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"github.com/jackc/pgx/v5/pgxpool"
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)
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var (
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ErrConfirmationNotFound = errors.New("audit: bestaetigungsvorgang nicht gefunden")
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ErrAlreadyDecided = errors.New("audit: bestaetigungsvorgang wurde bereits entschieden")
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ErrSameActor = errors.New("audit: bestaetigung muss von einer anderen person als der anfordernden erfolgen")
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ErrInvalidCode = errors.New("audit: bestaetigungscode ungueltig")
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)
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type ConfirmationStatus string
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const (
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StatusPending ConfirmationStatus = "pending"
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StatusConfirmed ConfirmationStatus = "confirmed"
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)
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// FourEyes implementiert das Vier-Augen-Prinzip fuer sicherheitskritische
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// Entscheidungen (Akzeptanzkriterium 2) nach dem archivdms-Vorbild:
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// FOR-UPDATE-Lock gegen Race-Bedingungen bei paralleler Bestaetigung,
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// Timing-safe Vergleich des Bestaetigungscodes (Akzeptanzkriterium 3).
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type FourEyes struct {
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pool *pgxpool.Pool
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}
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func NewFourEyes(pool *pgxpool.Pool) *FourEyes {
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return &FourEyes{pool: pool}
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}
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// Request legt einen neuen, zu bestaetigenden Vorgang an (z.B. Loeschbestaetigung,
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// Rechtevergabe) und liefert einen einmaligen Klartext-Code, der ausserhalb
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// dieses Systems (z.B. per E-Mail) an eine ZWEITE Person uebermittelt wird —
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// niemals der anfordernden Person selbst.
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func (f *FourEyes) Request(ctx context.Context, action, target, requestedBy string) (id, code string, err error) {
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code, err = generateCode()
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if err != nil {
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return "", "", fmt.Errorf("bestaetigungscode erzeugen: %w", err)
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}
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hash := hashCode(code)
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err = f.pool.QueryRow(ctx, `
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INSERT INTO security_confirmations (action, target, requested_by, code_hash, status)
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VALUES ($1, $2, $3, $4, 'pending')
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RETURNING id
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`, action, target, requestedBy, hash).Scan(&id)
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if err != nil {
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return "", "", fmt.Errorf("bestaetigungsvorgang anlegen: %w", err)
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}
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return id, code, nil
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}
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// Confirm bestaetigt einen Vorgang. confirmedBy MUSS sich von der
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// anfordernden Person unterscheiden (echtes Vier-Augen-Prinzip). Der Zugriff
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// auf die Zeile erfolgt mit FOR UPDATE, damit zwei gleichzeitige
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// Bestaetigungsversuche serialisiert werden und niemals beide durchgehen
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// (Akzeptanzkriterium 2 / Pruefung 2).
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func (f *FourEyes) Confirm(ctx context.Context, id, confirmedBy, code string) error {
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tx, err := f.pool.Begin(ctx)
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if err != nil {
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return fmt.Errorf("transaktion starten: %w", err)
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}
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defer func() { _ = tx.Rollback(ctx) }()
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var requestedBy, status string
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var codeHash []byte
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err = tx.QueryRow(ctx, `
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SELECT requested_by, status, code_hash FROM security_confirmations
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WHERE id = $1 FOR UPDATE
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`, id).Scan(&requestedBy, &status, &codeHash)
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if err != nil {
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if errors.Is(err, pgx.ErrNoRows) {
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return ErrConfirmationNotFound
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}
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return fmt.Errorf("bestaetigungsvorgang lesen: %w", err)
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}
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if status != string(StatusPending) {
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return ErrAlreadyDecided
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}
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if confirmedBy == requestedBy {
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return ErrSameActor
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}
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if !timingSafeEqual(hashCode(code), codeHash) {
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return ErrInvalidCode
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}
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if _, err := tx.Exec(ctx, `
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UPDATE security_confirmations
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SET status = 'confirmed', confirmed_by = $2, confirmed_at = now()
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WHERE id = $1
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`, id, confirmedBy); err != nil {
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return fmt.Errorf("bestaetigung speichern: %w", err)
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}
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return tx.Commit(ctx)
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}
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func generateCode() (string, error) {
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buf := make([]byte, 16)
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if _, err := rand.Read(buf); err != nil {
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return "", err
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}
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return hex.EncodeToString(buf), nil
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}
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func hashCode(code string) []byte {
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sum := sha256.Sum256([]byte(code))
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return sum[:]
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}
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@@ -0,0 +1,128 @@
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package audit
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import (
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"context"
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"errors"
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"os"
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"sync"
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"testing"
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"github.com/jackc/pgx/v5/pgxpool"
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)
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func setupFourEyesTest(t *testing.T) (*FourEyes, func()) {
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t.Helper()
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adminDSN := os.Getenv("TEST_ADMIN_DSN")
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if adminDSN == "" {
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t.Skip("TEST_ADMIN_DSN nicht gesetzt, Integrationstest uebersprungen")
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}
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ctx := context.Background()
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pool, err := pgxpool.New(ctx, adminDSN)
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if err != nil {
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t.Fatalf("pool: %v", err)
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}
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if _, err := pool.Exec(ctx, `
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CREATE TABLE IF NOT EXISTS security_confirmations (
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id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
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action TEXT NOT NULL,
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target TEXT NOT NULL,
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requested_by TEXT NOT NULL,
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code_hash BYTEA NOT NULL,
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status TEXT NOT NULL DEFAULT 'pending' CHECK (status IN ('pending', 'confirmed', 'rejected')),
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confirmed_by TEXT,
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created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
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confirmed_at TIMESTAMPTZ
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)`); err != nil {
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t.Fatalf("schema: %v", err)
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}
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cleanup := func() {
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_, _ = pool.Exec(ctx, `DELETE FROM security_confirmations WHERE action LIKE 'test.%'`)
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pool.Close()
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}
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return NewFourEyes(pool), cleanup
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}
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func TestFourEyes_RequestAndConfirm(t *testing.T) {
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fe, cleanup := setupFourEyesTest(t)
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defer cleanup()
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ctx := context.Background()
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id, code, err := fe.Request(ctx, "test.tenant_delete", "tenant:acme", "alice@example.com")
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if err != nil {
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t.Fatalf("request: %v", err)
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}
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if err := fe.Confirm(ctx, id, "bob@example.com", code); err != nil {
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t.Fatalf("confirm: %v", err)
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}
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}
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func TestFourEyes_RejectsSameActor(t *testing.T) {
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fe, cleanup := setupFourEyesTest(t)
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defer cleanup()
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ctx := context.Background()
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id, code, err := fe.Request(ctx, "test.tenant_delete", "tenant:acme", "alice@example.com")
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if err != nil {
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t.Fatalf("request: %v", err)
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}
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if err := fe.Confirm(ctx, id, "alice@example.com", code); !errors.Is(err, ErrSameActor) {
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t.Fatalf("erwartet ErrSameActor, habe %v", err)
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}
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}
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func TestFourEyes_RejectsWrongCode(t *testing.T) {
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fe, cleanup := setupFourEyesTest(t)
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defer cleanup()
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ctx := context.Background()
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id, _, err := fe.Request(ctx, "test.tenant_delete", "tenant:acme", "alice@example.com")
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if err != nil {
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t.Fatalf("request: %v", err)
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}
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|
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if err := fe.Confirm(ctx, id, "bob@example.com", "falscher-code"); !errors.Is(err, ErrInvalidCode) {
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t.Fatalf("erwartet ErrInvalidCode, habe %v", err)
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}
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}
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// Akzeptanzkriterium 2 + Pruefung 2: FOR-UPDATE-Lock unter parallelen
|
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// Anfragen race-frei — von zwei gleichzeitigen Bestaetigungsversuchen fuer
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// denselben Vorgang darf genau einer durchgehen.
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func TestFourEyes_ConcurrentConfirmIsRaceFree(t *testing.T) {
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fe, cleanup := setupFourEyesTest(t)
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defer cleanup()
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ctx := context.Background()
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id, code, err := fe.Request(ctx, "test.tenant_delete", "tenant:acme", "alice@example.com")
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if err != nil {
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t.Fatalf("request: %v", err)
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}
|
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|
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var wg sync.WaitGroup
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results := make([]error, 2)
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confirmers := []string{"bob@example.com", "carol@example.com"}
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for i := 0; i < 2; i++ {
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wg.Add(1)
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go func(i int) {
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defer wg.Done()
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results[i] = fe.Confirm(ctx, id, confirmers[i], code)
|
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}(i)
|
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}
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wg.Wait()
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successCount := 0
|
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for _, err := range results {
|
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if err == nil {
|
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successCount++
|
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} else if !errors.Is(err, ErrAlreadyDecided) {
|
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t.Fatalf("unerwarteter fehler: %v", err)
|
||||
}
|
||||
}
|
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if successCount != 1 {
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t.Fatalf("erwartet genau eine erfolgreiche bestaetigung, habe %d", successCount)
|
||||
}
|
||||
}
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@@ -0,0 +1,15 @@
|
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package audit
|
||||
|
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import "crypto/subtle"
|
||||
|
||||
// timingSafeEqual ist die projektweite Referenzimplementierung fuer
|
||||
// Timing-safe-Vergleiche sicherheitsrelevanter Geheimnisse (Bestaetigungs-
|
||||
// codes hier, spaeter Freigabelinks in Archive CMP-06 — siehe IAM-02-Ticket-
|
||||
// Konvention). subtle.ConstantTimeCompare vergleicht in konstanter Zeit
|
||||
// bezogen auf die Laenge von a, unabhaengig vom Inhalt.
|
||||
func timingSafeEqual(a, b []byte) bool {
|
||||
if len(a) != len(b) {
|
||||
return false
|
||||
}
|
||||
return subtle.ConstantTimeCompare(a, b) == 1
|
||||
}
|
||||
@@ -0,0 +1,62 @@
|
||||
package audit
|
||||
|
||||
import (
|
||||
"testing"
|
||||
"time"
|
||||
)
|
||||
|
||||
func TestTimingSafeEqual_Correctness(t *testing.T) {
|
||||
a := hashCode("geheimnis-a")
|
||||
b := hashCode("geheimnis-a")
|
||||
c := hashCode("geheimnis-b")
|
||||
|
||||
if !timingSafeEqual(a, b) {
|
||||
t.Fatal("identische hashes sollten gleich sein")
|
||||
}
|
||||
if timingSafeEqual(a, c) {
|
||||
t.Fatal("unterschiedliche hashes sollten ungleich sein")
|
||||
}
|
||||
if timingSafeEqual(a, []byte("kuerzer")) {
|
||||
t.Fatal("unterschiedliche laenge sollte ungleich sein")
|
||||
}
|
||||
}
|
||||
|
||||
// Akzeptanzkriterium 3 + Pruefung 3: Timing-safe Vergleich stichprobenartig
|
||||
// per Laufzeitmessung verifiziert — ein Mismatch am Anfang darf nicht
|
||||
// messbar schneller sein als ein Mismatch am Ende (klassisches Merkmal
|
||||
// eines NICHT timing-safen Vergleichs wie bytes.Equal mit Short-Circuit).
|
||||
func TestTimingSafeEqual_NoEarlyExitTiming(t *testing.T) {
|
||||
reference := hashCode("referenzwert-fuer-timing-test")
|
||||
|
||||
mismatchAtStart := make([]byte, len(reference))
|
||||
copy(mismatchAtStart, reference)
|
||||
mismatchAtStart[0] ^= 0xFF
|
||||
|
||||
mismatchAtEnd := make([]byte, len(reference))
|
||||
copy(mismatchAtEnd, reference)
|
||||
mismatchAtEnd[len(mismatchAtEnd)-1] ^= 0xFF
|
||||
|
||||
const iterations = 20000
|
||||
startDur := measure(iterations, func() { timingSafeEqual(reference, mismatchAtStart) })
|
||||
endDur := measure(iterations, func() { timingSafeEqual(reference, mismatchAtEnd) })
|
||||
|
||||
t.Logf("mismatch am anfang: %s, mismatch am ende: %s (%d iterationen)", startDur, endDur, iterations)
|
||||
|
||||
ratio := float64(startDur) / float64(endDur)
|
||||
// Grosszuegige Toleranz (Faktor 3), da es ein Stichprobentest auf einer
|
||||
// geteilten Testmaschine ist, kein isolierter Benchmark — es geht darum,
|
||||
// eine grobe Short-Circuit-Implementierung zuverlaessig aufzudecken
|
||||
// (die haette typischerweise eine Groessenordnung Unterschied), nicht um
|
||||
// kryptographisch praezise Constant-Time-Beweise.
|
||||
if ratio > 3.0 || ratio < 1.0/3.0 {
|
||||
t.Fatalf("timing-unterschied zu gross (verdacht auf short-circuit-vergleich): ratio=%.2f", ratio)
|
||||
}
|
||||
}
|
||||
|
||||
func measure(iterations int, fn func()) time.Duration {
|
||||
start := time.Now()
|
||||
for i := 0; i < iterations; i++ {
|
||||
fn()
|
||||
}
|
||||
return time.Since(start)
|
||||
}
|
||||
@@ -0,0 +1,3 @@
|
||||
DROP TRIGGER IF EXISTS audit_events_no_delete ON audit_events;
|
||||
DROP TRIGGER IF EXISTS audit_events_no_update ON audit_events;
|
||||
DROP FUNCTION IF EXISTS audit_events_prevent_mutation();
|
||||
@@ -0,0 +1,17 @@
|
||||
-- Audit-Log technisch gegen Aenderung/Loeschung absichern (AUD-02, siehe
|
||||
-- core-kanban/tickets/AUD-02.md). Ein Trigger statt nur GRANT/REVOKE, damit
|
||||
-- der Schutz unabhaengig davon greift, mit welcher Rolle verbunden wird
|
||||
-- (Akzeptanzkriterium 1: "auf Datenbankebene technisch unterbunden").
|
||||
CREATE FUNCTION audit_events_prevent_mutation() RETURNS TRIGGER AS $$
|
||||
BEGIN
|
||||
RAISE EXCEPTION 'audit_events ist append-only: % ist nicht erlaubt', TG_OP;
|
||||
END;
|
||||
$$ LANGUAGE plpgsql;
|
||||
|
||||
CREATE TRIGGER audit_events_no_update
|
||||
BEFORE UPDATE ON audit_events
|
||||
FOR EACH ROW EXECUTE FUNCTION audit_events_prevent_mutation();
|
||||
|
||||
CREATE TRIGGER audit_events_no_delete
|
||||
BEFORE DELETE ON audit_events
|
||||
FOR EACH ROW EXECUTE FUNCTION audit_events_prevent_mutation();
|
||||
@@ -0,0 +1 @@
|
||||
DROP TABLE IF EXISTS security_confirmations;
|
||||
@@ -0,0 +1,14 @@
|
||||
-- Vier-Augen-Prinzip fuer sicherheitskritische Entscheidungen (AUD-02
|
||||
-- Akzeptanzkriterium 2), Vorbild: archivdms FOR-UPDATE-Lock + Timing-safe
|
||||
-- Vergleich. code_hash speichert NIEMALS den Bestaetigungscode im Klartext.
|
||||
CREATE TABLE security_confirmations (
|
||||
id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
|
||||
action TEXT NOT NULL,
|
||||
target TEXT NOT NULL,
|
||||
requested_by TEXT NOT NULL,
|
||||
code_hash BYTEA NOT NULL,
|
||||
status TEXT NOT NULL DEFAULT 'pending' CHECK (status IN ('pending', 'confirmed', 'rejected')),
|
||||
confirmed_by TEXT,
|
||||
created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
|
||||
confirmed_at TIMESTAMPTZ
|
||||
);
|
||||
Reference in New Issue
Block a user