Mailinglist Archive: opensuse-security (499 mails)

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Re: [suse-security] Telnet Problem 2
  • From: Peter van den Heuvel <peter@xxxxxxxxxxxxxxxx>
  • Date: Thu, 06 Jun 2002 09:52:50 +0200
  • Message-id: <3CFF14D2.D7213CDA@xxxxxxxxxxxxxxxx>
> Jun 5 11:09:14 b235 in.telnetd[25273]: connect from 134.x.x.x (134.x.x.x)
> Jun 5 11:09:24 b235 login: FAILED LOGIN 1 FROM 134.x.x.x FOR UNKNOWN, User
> not known to the underlying authentication module

Like already said, all is safe. A snippet from man in.telnetd (note that
all modes require authentication):

SYNOPSIS
/usr/sbin/in.telnetd [-hns] [-a authmode] [-D debugmode] [-L
loginprg]
[-S tos] [-X authtype] [-edebug] [-debug port]

-a authmode This option may be used for specifying what mode
should be
used for authentication. Note that this option is
only use-
ful if telnetd has been compiled with support for
authenti-
cation, which is not available in the current
version. The
following values of authmode are understood:

debug Turns on authentication debugging code.

user Only allow connections when the remote user can
pro-
vide valid authentication information to
identify the
remote user, and is allowed access to the
specified
account without providing a password.

valid Only allow connections when the remote user can
pro-
vide valid authentication information to
identify the
remote user. The login(1) command will provide
any
additional user verification needed if the
remote
user is not allowed automatic access to the
specified
account.

other Only allow connections that supply some
authentica-
tion information. This option is currently not
sup-
ported by any of the existing authentication
mecha-
nisms, and is thus the same as specifying
valid.

none This is the default state. Authentication
informa-
tion is not required. If no or insufficient
authen-
tication information is provided, then the
login(1)
program will provide the necessary user
verification.

off This disables the authentication code. All
user ver-
ification will happen through the login(1)
program.

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References