(debian-policy.info)Using pseudo-ttys and modifying wtmp utmp and lastlog

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11.3 Using pseudo-ttys and modifying wtmp, utmp and lastlog
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Some programs need to create pseudo-ttys.  This should be done using
Unix98 ptys if the C library supports it.  The resulting program must
not be installed setuid root, unless that is required for other
functionality.

The files ‘/var/run/utmp’, ‘/var/log/wtmp’ and ‘/var/log/lastlog’ must
be installed writable by group ‘utmp’.  Programs which need to modify
those files must be installed setgid ‘utmp’.