fix(hub): a stranger who knows your name locks only browsers you never used

A sign-in from a browser that presented no token is answered with one
(known_browser, kept hashed, twenty per account); a later sign-in presenting it
counts failures on its own row, which nobody else can spend. Passphrase checks
inside an open session (change, e-mail, deletion, device, pepper) count on the
account's own row, so a locked name no longer stops its owner there either; /me
reports that row. Reset and erasure forget the browsers (F-15).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 16 insertions, 4 deletions

diff --git a/packages/meshbay-hub/tests/test_login_lockout.py b/packages/meshbay-hub/tests/test_login_lockout.py
index 601edbd..8f06d2d 100644
--- a/packages/meshbay-hub/tests/test_login_lockout.py
+++ b/packages/meshbay-hub/tests/test_login_lockout.py
@@ -131,8 +131,13 @@ async def test_a_burst_of_concurrent_guesses_gets_no_more_than_the_limit(client)
 
 
 @pytest.mark.asyncio
-async def test_change_password_counts_on_the_same_row(client):
-    """It checks the same passphrase, so it is the same oracle."""
+async def test_change_password_counts_on_the_sessions_own_row(client):
+    """
+    It checks the passphrase, so it is counted and locked like a sign-in — on a
+    row of the session's own. A stranger failing at sign-in must not stop the
+    owner changing their passphrase from a session they hold, and failures here
+    must not lock the owner's other browsers out of signing in.
+    """
     await _register(client, "grace_test")
     token = (await _login(client, "grace_test", RIGHT)).json()["access_token"]
     auth = {"Authorization": f"Bearer {token}"}
@@ -145,7 +150,7 @@ async def test_change_password_counts_on_the_same_row(client):
     r = await client.post("/v1/users/password", headers=auth, json={
         "old_auth_key": RIGHT, "new_auth_key": "n" * 44})
     assert r.status_code == 429, r.text
-    assert (await _login(client, "grace_test", RIGHT)).status_code == 429
+    assert (await _login(client, "grace_test", RIGHT)).status_code == 200
 
 
 @pytest.mark.asyncio
@@ -157,10 +162,17 @@ async def test_a_signed_in_session_is_told_its_own_lockout(client):
     auth = {"Authorization": f"Bearer {token}"}
     assert (await client.get("/v1/users/me", headers=auth)).json()["passphrase_locked_for"] == 0
 
-    await _fail(client, "olivia_test", 4)
+    for _ in range(4):
+        await client.post("/v1/users/password", headers=auth, json={
+            "old_auth_key": WRONG, "new_auth_key": "n" * 44})
     left = (await client.get("/v1/users/me", headers=auth)).json()["passphrase_locked_for"]
     assert 3500 <= left <= 3600
 
+    # A stranger failing at sign-in is not this session's lockout.
+    await _fail(client, "olivia_test", 4)
+    other = (await _login(client, "olivia_test", RIGHT))
+    assert other.status_code == 429
+
 
 @pytest.mark.asyncio
 async def test_an_attempt_that_checks_no_passphrase_is_not_counted(client, db_session):