Comment 1 for bug 838555

The messages and prompts are completely system defined and the greeter cannot tell what sort of message they are except by checking the text that they have (e.g. we match "password:" to be a password prompt).

Some suggestions of messages that may be displayed:
- Error message if the account is locked (authentication fails)
- Prompt to change password after logging in (see bug description for example)
- Prompt to enter an RSA key number (prompt input is not hidden like a password)
- Display a disclaimer that needs to be acnowledged to allow login