[Bug 1865517] Re: cannot log in with long username

[Jo K]

Nothing but i misexplained, bug isn't related to the fact that account exists or not.
Please try to enter in a tty that exact login :

'username.lastnamelastnamelastname at domain.fr'

It reset without asking for password, and the error line is added to
auth.log

Then try :

'username.lastname at domain.fr'

It asks for password, even that account doesn't exists, and the error
line isn't added

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https://bugs.launchpad.net/bugs/1865517

Title:
  cannot log in with long username

Status in pam package in Ubuntu:
  Incomplete

Bug description:
  We use ldap authentication with mail addresses as usernames.
  So usernames are not posix and some are > 32 chars but are working.

  Some of them fire a bug :
  When trying to log, it doesn't asks for password, it just wait some seconds then reset to ask username.

  I can't clearly identify which regex fire the bug or not but this one does
  "username.lastnamelastnamelastname at domain.fr"

  I reproduce it on ubuntu 18.04 and 20.04 daylibuild.

  In auth.log, that line pops up when bug is started

  "Mar  2 16:23:14 premier agetty[97945]: checkname failed: Operation
  not permitted"

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