M4-T07: add admin_cli disable-totp and reissue-totp escape commands

docs/design/m4-login-hardening.md

@@ -224,7 +224,7 @@ Phase B（TOTP，可选配）
 - **Reviewer checklist**: `totp_required` 时确未发 cookie；恢复码消费后不可复用；通用错误不泄露细节。
 
 ### M4-T07 — CLI disable-totp / reissue-totp
-- **Status**: `todo` · **Depends**: M4-T04（逻辑上配合 T03 的 CLI 骨架）
+- **Status**: `done` · **Depends**: M4-T04（逻辑上配合 T03 的 CLI 骨架）
 - **Files**: `modify scripts/admin_cli.py`；`modify tests/test_admin_cli.py`
 - **Steps**: `disable-totp <username>`：`totp_enabled=false` + 清 secret + 删恢复码（**不需任何恢复码即可执行**）；`reissue-totp <username>`：生成新 secret（可选打印新 URI）。
 - **Out of scope / 不要碰**: 不碰用户数据表。

scripts/admin_cli.py

@@ -18,6 +18,22 @@ unlock [--all | --ip <ip> | --username <u>]
     --username  clear the row for a specific username (scope='user')
     Prints the number of rows deleted.
 
+disable-totp <username>
+    Disable TOTP for the given user without requiring any existing credential
+    (recovery codes, current TOTP code, or password).  Sets totp_enabled=False,
+    clears totp_secret, and deletes ALL recovery codes for that user.
+    This is the final escape hatch when all recovery codes are lost.
+
+reissue-totp <username>
+    Generate a fresh TOTP secret for the given user and print the new
+    otpauth:// URI so the user can re-enroll in their Authenticator app.
+    totp_enabled is LEFT UNCHANGED (caller must re-run enable flow if needed).
+    Existing recovery codes are NOT deleted.  Recovery codes are independent
+    random values with no cryptographic binding to the TOTP secret, so they
+    remain valid after reissue and continue to serve as backup login credentials.
+    Silently removing them would unexpectedly strip the user of that backup;
+    use disable-totp for a full cleanup (secret + recovery codes).
+
 list-admin
     Print all users with their auth status columns (id, username,
     is_active, force_password_change).
@@ -25,9 +41,9 @@ list-admin
 Design contract
 ---------------
 - Direct DB access via ``get_session_local()`` — no HTTP, no network.
-- Only touches ``auth_users`` (password_hash column) and
-  ``auth_login_throttle`` (delete rows).  Never touches any user-data
-  table (location, poo, public_ip, app_config, etc.).
+- Only touches ``auth_users`` (totp_secret/totp_enabled/password_hash columns)
+  and ``auth_login_throttle`` / ``auth_recovery_code`` (delete rows).
+  Never touches any user-data table (location, poo, public_ip, app_config, etc.).
 - Non-zero exit code on user-facing errors (missing user, bad args, …).
 """
 
@@ -44,11 +60,13 @@ PROJECT_ROOT = Path(__file__).resolve().parents[1]
 if str(PROJECT_ROOT) not in sys.path:
     sys.path.insert(0, str(PROJECT_ROOT))
 
+import pyotp
 from sqlalchemy import delete, select
 from sqlalchemy.orm import Session
 
+from app.config import get_settings
 from app.db import get_session_local
-from app.models.auth import AuthUser
+from app.models.auth import AuthUser, RecoveryCode
 from app.models.auth_throttle import LoginThrottle
 from app.services.auth import hash_password, verify_password  # noqa: F401 (used below)
 
@@ -148,6 +166,103 @@ def cmd_unlock(args: argparse.Namespace) -> None:
         session.close()
 
 
+def cmd_disable_totp(args: argparse.Namespace) -> None:
+    """Disable TOTP for <username> — no credential required (escape hatch).
+
+    Sets totp_enabled=False, clears totp_secret, and deletes ALL recovery
+    codes for this user.  This is the final escape route when all recovery
+    codes have been lost: whoever holds server CLI access can always turn off
+    TOTP, restoring plain-password login.
+    """
+    username: str = args.username
+
+    session = _get_session()
+    try:
+        user = _find_user(session, username)
+        if user is None:
+            _die(f"User '{username}' not found.")
+
+        assert user.id is not None
+        # Delete all recovery codes for this user.
+        deleted = session.execute(
+            delete(RecoveryCode).where(RecoveryCode.user_id == user.id)
+        )
+        rc_count = deleted.rowcount
+
+        # Clear TOTP state.
+        user.totp_enabled = False
+        user.totp_secret = None
+        session.commit()
+
+        print(f"TOTP disabled for '{username}'. {rc_count} recovery code(s) deleted.")
+        print("The user can now log in with password only.")
+    finally:
+        session.close()
+
+
+def cmd_reissue_totp(args: argparse.Namespace) -> None:
+    """Generate a fresh TOTP secret for <username> and print the otpauth URI.
+
+    Design choices:
+    - ``totp_enabled`` is LEFT UNCHANGED.  If the user currently has TOTP
+      enabled, the new secret takes effect immediately on the next login
+      (old code invalid, new code accepted) — no web enable step required.
+      If TOTP was disabled, the secret is updated but login remains
+      password-only until the web setup/enable flow is completed.
+    - Existing recovery codes are NOT deleted here.  Recovery codes are
+      independent random values stored as Argon2 hashes in
+      ``auth_recovery_code.code_hash``; login verification compares only those
+      hashes and has no dependency on ``totp_secret``.  Reissuing the secret
+      therefore leaves all existing recovery codes fully valid — they remain
+      the user's backup login path.  Silently deleting them would
+      unexpectedly strip that backup; ``disable-totp`` is the explicit full
+      cleanup path (secret + all recovery codes).
+    - This command's purpose is to hand the new secret URI to the admin so
+      they can re-enroll their Authenticator — useful when the device is lost
+      but the account credentials are still intact.
+    """
+    username: str = args.username
+
+    session = _get_session()
+    try:
+        user = _find_user(session, username)
+        if user is None:
+            _die(f"User '{username}' not found.")
+
+        # Generate a new base-32 secret using pyotp (same library as the web TOTP flow).
+        new_secret = pyotp.random_base32()
+
+        # Build the provisioning URI using the same issuer logic as the web service.
+        settings = get_settings()
+        issuer = settings.effective_totp_issuer
+        otpauth_uri = pyotp.TOTP(new_secret).provisioning_uri(
+            name=user.username,
+            issuer_name=issuer,
+        )
+
+        user.totp_secret = new_secret
+        session.commit()
+
+        print(f"New TOTP secret issued for '{username}'.")
+        print(f"Secret : {new_secret}")
+        print(f"URI    : {otpauth_uri}")
+        print()
+        if user.totp_enabled:
+            print(
+                "NOTE: TOTP is still ENABLED.  Scan the URI above in your Authenticator app;"
+                " the new code is active immediately on next login — the old code is now invalid."
+                "  To fully disable TOTP instead, use 'disable-totp'."
+            )
+        else:
+            print(
+                "NOTE: TOTP is currently DISABLED for this user — login remains password-only."
+                "  The new secret has been saved, but will only take effect once TOTP is"
+                " enabled via the web settings page."
+            )
+    finally:
+        session.close()
+
+
 def cmd_list_admin(args: argparse.Namespace) -> None:  # noqa: ARG001
     """List all admin users with their status columns."""
     session = _get_session()
@@ -225,6 +340,28 @@ def build_parser() -> argparse.ArgumentParser:
     )
     ul.set_defaults(func=cmd_unlock)
 
+    # -- disable-totp --
+    dt = subparsers.add_parser(
+        "disable-totp",
+        help=(
+            "Disable TOTP for a user (escape hatch — no credential required). "
+            "Clears totp_secret, sets totp_enabled=False, deletes all recovery codes."
+        ),
+    )
+    dt.add_argument("username", help="Username whose TOTP to disable.")
+    dt.set_defaults(func=cmd_disable_totp)
+
+    # -- reissue-totp --
+    rt = subparsers.add_parser(
+        "reissue-totp",
+        help=(
+            "Generate a new TOTP secret for a user and print the otpauth:// URI. "
+            "totp_enabled is left unchanged; re-enroll via the web UI."
+        ),
+    )
+    rt.add_argument("username", help="Username for whom to reissue the TOTP secret.")
+    rt.set_defaults(func=cmd_reissue_totp)
+
     # -- list-admin --
     la = subparsers.add_parser(
         "list-admin",

tests/test_admin_cli.py

@@ -1,8 +1,10 @@
-"""Tests for M4-T03: scripts/admin_cli.py — CLI escape hatch.
+"""Tests for M4-T03 + M4-T07: scripts/admin_cli.py — CLI escape hatch.
 
 Covers:
 - reset-password: new password verifies, old password fails.
 - unlock: clears specified/all throttle rows; prints count; idempotent.
+- disable-totp: clears TOTP state + recovery codes without requiring any credential.
+- reissue-totp: writes new secret; prints otpauth URI; secret changes.
 - list-admin: prints user table without crashing.
 - Non-existent user → friendly error + SystemExit with non-zero code.
 - Data-safety: CLI must never reference user-data tables in delete/drop.
@@ -26,13 +28,15 @@ from sqlalchemy.orm import Session, sessionmaker
 
 from app.db import reset_db_caches
 from app.config import get_settings
-from app.models.auth import AuthUser
+from app.models.auth import AuthUser, RecoveryCode
 from app.models.auth_throttle import LoginThrottle
 from app.services.auth import hash_password, verify_password
 from scripts.admin_cli import (
     build_parser,
+    cmd_disable_totp,
     cmd_list_admin,
     cmd_reset_password,
+    cmd_reissue_totp,
     cmd_unlock,
 )
 
@@ -129,6 +133,25 @@ def _throttle_count(session: Session) -> int:
     return session.query(LoginThrottle).count()
 
 
+def _enable_totp_for_user(session: Session, username: str, secret: str = "JBSWY3DPEHPK3PXP") -> None:
+    """Helper: set TOTP enabled + secret for a user and add some recovery codes."""
+    user = session.scalar(select(AuthUser).where(AuthUser.username == username))
+    assert user is not None, f"User '{username}' not found in _enable_totp_for_user"
+    user.totp_secret = secret
+    user.totp_enabled = True
+    # Add two fake recovery codes so we can verify they get deleted.
+    session.add(RecoveryCode(user_id=user.id, code_hash=hash_password("aaaa-bbbb")))
+    session.add(RecoveryCode(user_id=user.id, code_hash=hash_password("cccc-dddd")))
+    session.commit()
+    session.expire_all()
+
+
+def _recovery_code_count(session: Session, username: str) -> int:
+    user = session.scalar(select(AuthUser).where(AuthUser.username == username))
+    assert user is not None
+    return session.query(RecoveryCode).filter(RecoveryCode.user_id == user.id).count()
+
+
 # ---------------------------------------------------------------------------
 # reset-password tests
 # ---------------------------------------------------------------------------
@@ -342,6 +365,182 @@ class TestListAdmin:
         reset_db_caches()
 
 
+# ---------------------------------------------------------------------------
+# disable-totp tests
+# ---------------------------------------------------------------------------
+
+
+class TestDisableTotp:
+    """disable-totp sub-command (M4-T07)."""
+
+    def test_disable_totp_clears_state(self, cli_db: str, cli_session: Session):
+        """After disable-totp: totp_enabled=False, totp_secret=None, recovery codes gone."""
+        _enable_totp_for_user(cli_session, "admin")
+
+        # Verify preconditions.
+        user = cli_session.scalar(select(AuthUser).where(AuthUser.username == "admin"))
+        assert user is not None
+        assert user.totp_enabled is True
+        assert user.totp_secret is not None
+        assert _recovery_code_count(cli_session, "admin") == 2
+
+        # Run disable-totp — NO credential supplied (escape hatch semantics).
+        parser = build_parser()
+        args = parser.parse_args(["disable-totp", "admin"])
+        cmd_disable_totp(args)
+
+        # Verify state.
+        cli_session.expire_all()
+        user = cli_session.scalar(select(AuthUser).where(AuthUser.username == "admin"))
+        assert user is not None
+        assert user.totp_enabled is False
+        assert user.totp_secret is None
+        assert _recovery_code_count(cli_session, "admin") == 0
+
+    def test_disable_totp_no_credential_required(self, cli_db: str, cli_session: Session):
+        """disable-totp must succeed without any recovery code or password argument."""
+        _enable_totp_for_user(cli_session, "admin")
+
+        # The argparse spec for disable-totp takes only username — no credential flags.
+        # Parsing must succeed with just the username.
+        parser = build_parser()
+        args = parser.parse_args(["disable-totp", "admin"])
+        # No exception means no credential was needed.
+        cmd_disable_totp(args)  # must not raise
+
+    def test_disable_totp_already_disabled_is_noop(self, cli_db: str, cli_session: Session):
+        """disable-totp on a user who never had TOTP is a harmless no-op."""
+        user = cli_session.scalar(select(AuthUser).where(AuthUser.username == "admin"))
+        assert user is not None
+        assert user.totp_enabled is False
+
+        parser = build_parser()
+        args = parser.parse_args(["disable-totp", "admin"])
+        cmd_disable_totp(args)  # must not raise
+
+        cli_session.expire_all()
+        user = cli_session.scalar(select(AuthUser).where(AuthUser.username == "admin"))
+        assert user is not None
+        assert user.totp_enabled is False
+        assert user.totp_secret is None
+
+    def test_disable_totp_nonexistent_user_exits_nonzero(self, cli_db: str):
+        """disable-totp for an unknown user must SystemExit with code != 0."""
+        parser = build_parser()
+        args = parser.parse_args(["disable-totp", "ghost-user"])
+        with pytest.raises(SystemExit) as exc_info:
+            cmd_disable_totp(args)
+        assert exc_info.value.code != 0
+
+    def test_disable_totp_prints_confirmation(
+        self, cli_db: str, cli_session: Session, capsys
+    ):
+        """disable-totp must print a confirmation message mentioning the user."""
+        _enable_totp_for_user(cli_session, "admin")
+
+        parser = build_parser()
+        args = parser.parse_args(["disable-totp", "admin"])
+        cmd_disable_totp(args)
+
+        captured = capsys.readouterr()
+        assert "admin" in captured.out
+
+    def test_disable_totp_does_not_touch_password(
+        self, cli_db: str, cli_session: Session
+    ):
+        """disable-totp must not alter the user's password_hash."""
+        _enable_totp_for_user(cli_session, "admin")
+
+        user_before = cli_session.scalar(select(AuthUser).where(AuthUser.username == "admin"))
+        assert user_before is not None
+        pw_hash_before = user_before.password_hash
+
+        parser = build_parser()
+        args = parser.parse_args(["disable-totp", "admin"])
+        cmd_disable_totp(args)
+
+        cli_session.expire_all()
+        user_after = cli_session.scalar(select(AuthUser).where(AuthUser.username == "admin"))
+        assert user_after is not None
+        assert user_after.password_hash == pw_hash_before
+
+
+# ---------------------------------------------------------------------------
+# reissue-totp tests
+# ---------------------------------------------------------------------------
+
+
+class TestReissueTotp:
+    """reissue-totp sub-command (M4-T07)."""
+
+    def test_reissue_totp_changes_secret(self, cli_db: str, cli_session: Session):
+        """After reissue-totp, totp_secret must be a new non-empty value."""
+        old_secret = "JBSWY3DPEHPK3PXP"
+        _enable_totp_for_user(cli_session, "admin", secret=old_secret)
+
+        parser = build_parser()
+        args = parser.parse_args(["reissue-totp", "admin"])
+        cmd_reissue_totp(args)
+
+        cli_session.expire_all()
+        user = cli_session.scalar(select(AuthUser).where(AuthUser.username == "admin"))
+        assert user is not None
+        assert user.totp_secret is not None
+        assert user.totp_secret != old_secret, "Secret must be regenerated"
+
+    def test_reissue_totp_prints_uri(self, cli_db: str, cli_session: Session, capsys):
+        """reissue-totp must print an otpauth:// URI and the secret."""
+        _enable_totp_for_user(cli_session, "admin")
+
+        parser = build_parser()
+        args = parser.parse_args(["reissue-totp", "admin"])
+        cmd_reissue_totp(args)
+
+        captured = capsys.readouterr()
+        assert "otpauth://" in captured.out
+        assert "Secret" in captured.out
+
+    def test_reissue_totp_totp_enabled_unchanged(self, cli_db: str, cli_session: Session):
+        """reissue-totp must leave totp_enabled in its current state (True stays True)."""
+        _enable_totp_for_user(cli_session, "admin")
+
+        user_before = cli_session.scalar(select(AuthUser).where(AuthUser.username == "admin"))
+        assert user_before is not None
+        assert user_before.totp_enabled is True
+
+        parser = build_parser()
+        args = parser.parse_args(["reissue-totp", "admin"])
+        cmd_reissue_totp(args)
+
+        cli_session.expire_all()
+        user_after = cli_session.scalar(select(AuthUser).where(AuthUser.username == "admin"))
+        assert user_after is not None
+        assert user_after.totp_enabled is True, "totp_enabled must remain unchanged"
+
+    def test_reissue_totp_disabled_user_stays_disabled(
+        self, cli_db: str, cli_session: Session
+    ):
+        """reissue-totp on a user with totp_enabled=False leaves it False."""
+        # Don't enable TOTP — user is in disabled state.
+        parser = build_parser()
+        args = parser.parse_args(["reissue-totp", "admin"])
+        cmd_reissue_totp(args)
+
+        cli_session.expire_all()
+        user = cli_session.scalar(select(AuthUser).where(AuthUser.username == "admin"))
+        assert user is not None
+        assert user.totp_enabled is False, "totp_enabled must remain False"
+        assert user.totp_secret is not None, "A new secret should have been written"
+
+    def test_reissue_totp_nonexistent_user_exits_nonzero(self, cli_db: str):
+        """reissue-totp for an unknown user must SystemExit with code != 0."""
+        parser = build_parser()
+        args = parser.parse_args(["reissue-totp", "ghost-user"])
+        with pytest.raises(SystemExit) as exc_info:
+            cmd_reissue_totp(args)
+        assert exc_info.value.code != 0
+
+
 # ---------------------------------------------------------------------------
 # Argument-parser edge-cases
 # ---------------------------------------------------------------------------
@@ -387,4 +586,6 @@ def test_help_flag_exits_zero():
     assert result.returncode == 0
     assert "reset-password" in result.stdout
     assert "unlock" in result.stdout
+    assert "disable-totp" in result.stdout
+    assert "reissue-totp" in result.stdout
     assert "list-admin" in result.stdout