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testland/session-management-test-author
Use for any question or task about testing sessions, login or logout security in a web app, in any framework, including one login handler and old cookies that still work after logout: cookie flags (Secure, HttpOnly, SameSite), session ID regeneration on login, idle and absolute timeouts, concurrent-session limits, logout on all devices, CSRF tokens and session binding, per OWASP ASVS V3.
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session-test-patterns.mdreferences/
Session-management extended test patterns
Extends SKILL.md Steps 4, 5, and 7. Core patterns (cookie attributes, session-fixation, timeouts, CSRF, single-device logout) stay in SKILL.md.
Concurrent-session limits (Step 4)
def test_concurrent_session_limit(client_a, client_b, base_url):
client_a.login("alice", "alicepass")
client_b.login("alice", "alicepass") # second session
# Per app config: either client_a's session is revoked, OR the
# second login is rejected. Document the policy + test it:
response_a = client_a.get(f"{base_url}/dashboard")
response_b = client_b.get(f"{base_url}/dashboard")
if app_policy == "single_session":
assert response_a.status_code == 401 # a was revoked
assert response_b.status_code == 200
elif app_policy == "limited_concurrent":
# both work; assert correct behavior
...Logout across all devices (Step 5)
def test_logout_all_devices_invalidates_other_sessions(client_a, client_b, base_url):
# alice logs in on two devices
client_a.login("alice", "alicepass")
client_b.login("alice", "alicepass")
# alice triggers "logout from all devices" on client_a
client_a.post(f"{base_url}/account/logout-all")
# Both sessions must be dead
assert client_a.get(f"{base_url}/dashboard").status_code == 401
assert client_b.get(f"{base_url}/dashboard").status_code == 401Session binding (Step 7)
def test_session_bound_to_user_agent(client, base_url):
client.login("alice", "alicepass", user_agent="Mozilla/5.0 ...")
cookie_value = client.cookies.get("sessionid")
response = requests.get(
f"{base_url}/dashboard",
cookies={"sessionid": cookie_value},
headers={"User-Agent": "Different-UA"}, # different UA
)
assert response.status_code == 401 # if UA-binding is enforcedAnti-patterns
| Anti-pattern | Why it fails | Fix |
|---|---|---|
| Skip Set-Cookie attribute test | Sessions transmitted insecurely; XSS-stealable cookies | Step 1 baseline |
| Logout = clear cookie only (no server-side invalidation) | Cookie replay continues to work | Step 5 negative test |
| Same session ID before + after login | Session-fixation vulnerable | Step 2 regenerate test |
| No absolute timeout | Sessions live forever; account-takeover blast radius huge | Step 3 |
| State-changing GET requests | Always vulnerable to CSRF | Convert to POST + CSRF token (Step 6) |