Add a fix script to delete all accounts with invalid usernames. Also
change it so the owner-level user can delete accounts belonging to other
users.
Users who have logged in in the last year and who have a valid email
address will be given a one week warning. After that all accounts with
invalid names will be deleted. Anyone who has visited the site in the
last 6 months will have already seen a warning page that their name must
be changed to keep using the site.
Add tracking of certain important user actions. These events include:
* Logins
* Logouts
* Failed login attempts
* Account creations
* Account deletions
* Password reset requests
* Password changes
* Email address changes
This is similar to the mod actions log, except for account activity
related to a single user.
The information tracked includes the user, the event type (login,
logout, etc), the timestamp, the user's IP address, IP geolocation
information, the user's browser user agent, and the user's session ID
from their session cookie. This information is visible to mods only.
This is done with three models. The UserEvent model tracks the event
type (login, logout, password change, etc) and the user. The UserEvent
is tied to a UserSession, which contains the user's IP address and
browser metadata. Finally, the IpGeolocation model contains the
geolocation information for IPs, including the city, country, ISP, and
whether the IP is a proxy.
This tracking will be used for a few purposes:
* Letting users view their account history, to detect things like logins
from unrecognized IPs, failed logins attempts, password changes, etc.
* Rate limiting failed login attempts.
* Detecting sockpuppet accounts using their login history.
* Detecting unauthorized account sharing.
Use validations instead of raising an exception when the password is
incorrect so that the controller can display errors sensibly.
Also fix users being logged out even when the deletion attempt failed
due to an incorrect password.
Remove the "Remember" checkbox from the login page. Make session cookies
permanent instead. Phase out legacy `user_name` and `password_hash` cookies.
Previously a user's session cookies would be cleared whenever they
closed their browser window, which would log them out of the site. To
work around this, when the "Remember" box was checked on the login page
(which it was by default), the user's name and password hash (!) would
be stored in separate permanent cookies, which would be used to
automatically log the user back in when their session cookies were
cleared. We can avoid all of this just by making the session cookies
themselves permanent.
