Date: Thu, 18 Mar 1999 17:23:42 +0100 (CET) From: Zahemszky Gabor <zgabor@CoDe.hu> To: freebsd-security@freebsd.org Subject: bug (?) in login limits from login.conf Message-ID: <199903181623.RAA00488@CoDe.hu>
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Hi!
I've found, that in my new 3.1RELEASE, there is an interesting bug in
login(1) with the /etc/login.conf ttys.deny/host.deny/times.deny mechanism.
(Well, I've found it on 2.2.5(?) and it works the same in 2.2.7.)
If there are any login restrictions (time/host or line) in /etc/login.conf,
login responds with:
<time restriction>:
``Logins not available right now''
<host/terminal restriction>:
``permission denied''
Instead of ``Login incorrect'' - of course, we have to know login/password.
But. There is a little possibility, that on a machine, with such login
restrictions alive, I can find out some dummy users name/password. If
something is wrong, I've got ``login incorrect''. But if it's right, and
only not the correct time/line/host, we know it. So we have a name/password
in our hands, so we have to try it another time, another line, from another
host ...
(Well, the same applies to /etc/login.access: instead of login incorrect,
login(1) resposes: permission denied.)
As I know, login(1) says login incorrect, and not that: your password is
wrong. And login(1) asks a password, and doesn't say: sorry, it's not a
good login name. It's nothing, but information hiding.
I think, the correct form is:
good login -> login
bad login/restrictions/anything -> login incorrect
Bye,
ZGabor at CoDe dot HU
--
#!/bin/ksh
Z='21N16I25C25E30, 40M30E33E25T15U!' ;IFS=' ABCDEFGHIJKLMNOPQRSTUVWXYZ ';set $Z ;for i { [[ $i = ? ]]&&print $i&&break;[[ $i = ??? ]]&&j=$i&&i=${i%?};typeset -i40 i=8#$i;print -n ${i#???};[[ "$j" = ??? ]]&&print -n "${j#??} "&&j=;typeset +i i;};IFS=' 0123456789 ';set $Z;X=;for i { [[ $i = , ]]&&i=2;[[ $i = ?? ]]||typeset -l i;X="$X $i";typeset +l i;};print "$X"
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