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тАО08-12-2009 06:13 AM
тАО08-12-2009 06:13 AM
who can telnet
I have /etc/securetty file and only console in it that means root canot login... But if somebody asks me who can log into this box, does that mean who has account in that box or not....
let me know what you think
Thanks
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тАО08-12-2009 06:20 AM
тАО08-12-2009 06:20 AM
Re: who can telnet
Remeber ftp only accounts also exists in /etc/passwd , however their shell configured as ftponly (restricted shell ), they can't telnet or ssh.
Cheers.
Raj.
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тАО08-12-2009 06:34 AM
тАО08-12-2009 06:34 AM
Re: who can telnet
Normally anybody in the /etc/passwd can telnet the system until unless you enabled any security.
from the man pages
Root access can be denied to any port on the system by the use of the
/etc/securetty file. If not present (the default), anyone who knows the
root password can login as root regardless of their location (modem,
DTC port, tty port, network login).
However, if the /etc/securetty file contains:
console
tty0p4
tty1p2
then root logins will fail "Login incorrect" if the user is not on the
3 ports listed in the above example. If the word console is not in the
/etc/securetty file then root login at the console is disabled! Any
attempt by someone on port tty0p1, etc will also fail, even though the
correct password has been supplied.
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тАО08-12-2009 06:55 AM
тАО08-12-2009 06:55 AM
Re: who can telnet
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тАО08-12-2009 07:40 AM
тАО08-12-2009 07:40 AM
Re: who can telnet
1) the account has to have a valid shell
2) telnet has to be enabled, as opposed to something like using ssh
3) account can't be locked.