feat: require_mfa setting and user_mfa ciphertext mirror

backup/ciphertext_fields_test.go

@@ -0,0 +1,22 @@
+package backup
+
+import "testing"
+
+// user_mfa holds an encrypted TOTP secret. Absent from this map, verify's live
+// probe reports "this database stores no ciphertext yet" and the one gate that
+// catches a wrong encryption key becomes a no-op for MFA secrets.
+func TestUserMFACiphertextIsMirrored(t *testing.T) {
+	fields, ok := ciphertextFields["user_mfa"]
+	if !ok {
+		t.Fatal("ciphertextFields has no entry for user_mfa")
+	}
+	found := false
+	for _, f := range fields {
+		if f == "totp_secret_enc" {
+			found = true
+		}
+	}
+	if !found {
+		t.Fatalf("user_mfa entry %v does not name totp_secret_enc", fields)
+	}
+}

backup/verify.go

@@ -128,6 +128,7 @@ func probe(ctx context.Context, opt VerifyOptions, rep *VerifyReport) error {
 //	secrets          - models/secret.go: encrypted_value
 //	auth_providers   - models/auth_provider.go: client_secret_enc
 //	console_sessions - models/console_session.go: rdp_user_enc, rdp_pass_enc
+//	user_mfa         - models/user_mfa.go: totp_secret_enc
 //
 // settings is deliberately absent: it holds no ciphertext at all. The ESO read
 // token is stored as a SHA-256 hash, which no key opens.
@@ -136,6 +137,7 @@ var ciphertextFields = map[string][]string{
 	"secrets":          {"encrypted_value"},
 	"auth_providers":   {"client_secret_enc"},
 	"console_sessions": {"rdp_user_enc", "rdp_pass_enc"},
+	"user_mfa":         {"totp_secret_enc"},
 }
 
 func findCiphertext(ctx context.Context, db *mongo.Database, coll string) (string, bool, error) {

models/settings.go

@@ -35,6 +35,12 @@ type Settings struct {
 	// upgrade. Nil means enabled.
 	LocalLoginEnabled *bool `bson:"local_login_enabled,omitempty" json:"local_login_enabled,omitempty"`
 
+	// RequireMFA forces every password-authenticated member to hold a second
+	// factor. A pointer for the same reason LocalLoginEnabled is: absent must
+	// mean off, and a plain bool read from an old document would lock out an
+	// entire instance at upgrade.
+	RequireMFA *bool `bson:"require_mfa,omitempty" json:"require_mfa,omitempty"`
+
 	// VulnFindingRetentionDays is a pointer for the same reason
 	// WorkflowLogRetentionDays is: absent must mean the default, not zero.
 	// Nil is 90 days, 0 is forever. Only "fixed" findings are ever swept.
@@ -62,6 +68,12 @@ func LocalLoginEnabled(s *Settings) bool {
 	return *s.LocalLoginEnabled
 }
 
+// RequireMFA reads the MFA policy with its absent-means-off default. Every
+// caller must go through this rather than dereferencing the field.
+func RequireMFA(s *Settings) bool {
+	return s != nil && s.RequireMFA != nil && *s.RequireMFA
+}
+
 // APITokenMaxDays reads the token lifetime cap with its absent-means-uncapped
 // default. 0 means no cap. Every caller must go through this rather than
 // dereferencing the field.