HyperAdmin

Woozle: HyperAdmin

This is my attempt to create a general user administration system for use by other web-based applications (mostly mine) which might need one.

Login Sequence

Major phases

1. check what came in (form/cookies); set flags
2. inspect the database; set flags
3. set cookies and show html

Flow chart

• Phase I: check what came in
  1. Get user form input (user, pass, possibly extra pass & email)
  2. If no user given:
     • check cookies for session key
       • If session key found in cookies:
         • If session is active and valid:
           • Set $login_ok flag
         • ...else (session invalid or expired):
           • Set login message to "invalid or expired session; please log in"
           • Set $do_login_screen flag
       • If no session key found in cookies:
         • set $do_login_screen flag
         • set login message to "Please log in"
  3. ...else (user given):
     • If password also given
       • If 2nd password given:
         • If 2 passwords match set $do_create_user flag
         • If 2 passwords don't match:
           • set $do_login_screen flag
           • set login message to "passwords don't match"
         • ...else (no 2nd password):
           • set $do_login_attempt flag
• Phase II: check database
  1. Open database and inspect "users" table.
  2. If no users yet:
     • If $do_create_user:
       • Add user to database
       • Give user "god" permissions
       • Set $login_ok flag
     • ...else (not $do_create_user):
       • Set login message to "you are the first user; please create a new account"
  3. ...else if users found:
     • If user matches existing username, set $do_login_attempt flag
     • If $do_login_attempt:
       • Lookup encrypted password for given user
       • If encryption of new password matches
         • set $login_ok flag
         • if previous login was successful (check timestamps), set login attempts to zero
       • ...else (password mismatch):
         • increment login attempts for this user
         • set login message to "invalid user/password"
         • if $is_revisit, log a HACK WARNING
     • ...else (not $do_login_attempt):
       • If $new_pass_valid:
         • Create new account
         • Set $login_ok flag
       • ...else (not $new_pass_valid):
         • set $do_login_screen flag
• Phase III: set cookies and show html
  1. if $do_login_screen:
     • Show login screen, login message, and # of login attempts for this user
  2. ...else if $login_ok
     • Set user/pass cookie
     • Show control bar, with appropriate applications enabled and user info:
       • Time of last successful login
       • Time of last unsuccessful login
       • Number of failed login attempts

Possible security holes:

• Can $do_login_screen and $login_ok both end up false? In this case, nothing would be displayed.
• Can $do_login_screen and $login_ok both end up true? Is the resulting behavior appropriate?

Notes

"Session key" could be dumbed down to just username+password sent in a single parameter, if proper sessions were not otherwise needed for a site, though sessions do provide better security even if they aren't used for anything else.

Tables

• "K" indicates Primary Key fields
• "#" indicates autonumbered fields

Main data tables

• users -- users with access to the admin system

#K	ID	int(4)
	Name	varchar(32)
	Pass	text
	Email	varchar(128)	email address for password confirmation and such
	WhenGood	timestamp	when user last logged in
	WhenBad	timestamp	when user last attempted to log in but failed (bad password)
	QtyFails	int(4)	number of failed login attempts since last success

• groups -- each group has a role to play, and each role requires a particular set of privileges

#K	ID	int(4)
	Name	varchar(32)
	Descr	text	text describing the purpose of this group

• privs -- particular privileges; meaning is defined in code

#K	ID	int(4)
	Name	varchar(32)
	Descr	text	text describing this permission

Collection/link tables

• users_x_groups -- users in each group / groups to which each user belongs

K	ID_User	int(4)	users.ID
K	ID_Group	int(4)	groups.ID

• groups_x_privs -- privileges each group has / groups having a particular privilege

K	ID_Group	int(4)	groups.ID
K	ID_Priv	int(4)	privs.ID

Activity tables

• sessions -- shopping sessions

K#	ID	int(4)
	Cookie	text	session-ID cookie (at least 32 128 bits of random data)
	User	int(4)	users.ID of authenticated user (logged in with password); NULL = no user, or not authenticated
	Remote_Client	text	browser user_agent string
	Remote_Host	text	remote host domain info (reverse lookup), if any
	Remote_Addr	int(4)	remote host IP address
	Remote_Key	text	remote address or host domain plus user_agent - for quick search of userless sessions
	WhenStarted	timestamp	when session was started
	WhenLastAct	timestamp	timestamp of last activity on this session
	WhenExpires	timestamp	when this session will expire; NULL=never (see HyperAdmin Sessions)
	WhenExpired	timestamp	when this session was actually expired (see Rules below)

Rules:

• if same user connects with new session, any existing sessions are automatically deactivated
• sessions.WhenExpired can be NULL even after WhenExpires if session is never accessed after WhenExpires and same user does not ever reconnect

• events -- logs of login attempts as well as what users did while logged in

K#	ID	int(4)
	ID_User	int(4)	users.ID - which user, if any (NULL = unknown user)
	ID_Session	int(4)	sessions.ID - more information in case user is unknown
	When	timestamp	when this action was taken
	Seq	int(4)	Order in which actions were executed, if done at the same time
	Type	text(8)	short code for event type - [event_types] table (to be designed)
	Descr	text	description of action taken (should be very specific)