743 lines
14 KiB
HTML
743 lines
14 KiB
HTML
<HTML
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><HEAD
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><TITLE
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>Setting Up Your System for Dialing In</TITLE
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>Linux Network Administrators Guide</TH
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HREF="x-087-2-uucp.permissions.html"
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Chapter 16. ManagingTaylor UUCP</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="x-087-2-uucp.protocols.html"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="X-087-2-UUCP.DIALIN"
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>16.4. Setting Up Your System for Dialing In</A
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></H1
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><P
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>
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If you want to set up your site for dialing in, you have to permit logins on
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your serial port and customize some system files to provide UUCP accounts,
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which we will cover in this section. </P
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="X-087-2-UUCP.DIALIN.ACCOUNTS"
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>16.4.1. Providing UUCP Accounts</A
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></H2
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><P
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>
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To begin with, you have to set up user accounts that let remote sites log into
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your system and establish a UUCP connection. Generally, you will provide
|
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a separate login name to each system that polls you. When setting up an
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account for system <SPAN
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CLASS="SYSTEMITEM"
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>pablo</SPAN
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>, you might
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give it the username <SPAN
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CLASS="SYSTEMITEM"
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>Upablo</SPAN
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>. There is
|
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no enforced policy on login names; they can be just about anything, but it
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will be convenient for you if the login name is easily related to the remote
|
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host name.</P
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><P
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>For systems that dial in through the serial port, you usually have to add
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these accounts to the system password file <TT
|
|
CLASS="FILENAME"
|
|
>/etc/passwd</TT
|
|
>.
|
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It is good practice to put all UUCP logins in a special group, such as
|
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<SPAN
|
|
CLASS="SYSTEMITEM"
|
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>uuguest</SPAN
|
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>. The account's home directory
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should be set to the public spool directory
|
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<TT
|
|
CLASS="FILENAME"
|
|
>/var/spool/uucppublic</TT
|
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> ; its login shell must be
|
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<B
|
|
CLASS="COMMAND"
|
|
>uucico</B
|
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>.</P
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><P
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>
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To serve UUCP systems that connect to your site over TCP, you have to
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set up <B
|
|
CLASS="COMMAND"
|
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>inetd</B
|
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> to handle incoming connections on the
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<SPAN
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CLASS="SYSTEMITEM"
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>uucp</SPAN
|
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> port by adding the
|
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following line to
|
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<TT
|
|
CLASS="FILENAME"
|
|
>/etc/inetd.conf</TT
|
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> :<A
|
|
NAME="X-087-2-FNUU14"
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HREF="#FTN.X-087-2-FNUU14"
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>[1]</A
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>
|
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<TABLE
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BORDER="0"
|
|
BGCOLOR="#E0E0E0"
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WIDTH="100%"
|
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><TR
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><TD
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><PRE
|
|
CLASS="SCREEN"
|
|
>uucp stream tcp nowait root /usr/sbin/tcpd /usr/lib/uucp/uucico -l</PRE
|
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></TD
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></TR
|
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></TABLE
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></P
|
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><P
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>
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The <TT
|
|
CLASS="OPTION"
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>–l</TT
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> option makes <B
|
|
CLASS="COMMAND"
|
|
>uucico</B
|
|
> perform
|
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its own login authorization. It prompts for a login name and a password
|
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just like the standard <B
|
|
CLASS="COMMAND"
|
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>login</B
|
|
> program, but relies on its
|
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private password database instead of <TT
|
|
CLASS="FILENAME"
|
|
>/etc/passwd</TT
|
|
>. This
|
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private password file is named <TT
|
|
CLASS="FILENAME"
|
|
>/etc/uucp/passwd</TT
|
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> and
|
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contains pairs of login names and passwords:
|
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|
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<TABLE
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BORDER="0"
|
|
BGCOLOR="#E0E0E0"
|
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WIDTH="100%"
|
|
><TR
|
|
><TD
|
|
><PRE
|
|
CLASS="SCREEN"
|
|
>Upablo IslaNegra
|
|
Ulorca co'rdoba</PRE
|
|
></TD
|
|
></TR
|
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></TABLE
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></P
|
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><P
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>This file must be owned by
|
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<SPAN
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CLASS="SYSTEMITEM"
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>uucp</SPAN
|
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> and have permissions of 600.</P
|
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><P
|
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> Does this database sound like such a good idea that you would like to use
|
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it on normal serial logins, too? Well, in some cases you can. What you
|
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need is a <B
|
|
CLASS="COMMAND"
|
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>getty</B
|
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> program that you can tell to invoke
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<B
|
|
CLASS="COMMAND"
|
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>uucico</B
|
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> instead of <B
|
|
CLASS="COMMAND"
|
|
>/bin/login</B
|
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> for
|
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your UUCP users.<A
|
|
NAME="X-087-2-FNUU15"
|
|
HREF="#FTN.X-087-2-FNUU15"
|
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>[2]</A
|
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> The invocation of
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<B
|
|
CLASS="COMMAND"
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>uucico</B
|
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> would look like this:
|
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<TABLE
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BORDER="0"
|
|
BGCOLOR="#E0E0E0"
|
|
WIDTH="100%"
|
|
><TR
|
|
><TD
|
|
><PRE
|
|
CLASS="SCREEN"
|
|
>/usr/lib/uucp/uucico -l -u <TT
|
|
CLASS="REPLACEABLE"
|
|
><I
|
|
>user</I
|
|
></TT
|
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></PRE
|
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></TD
|
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></TR
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></TABLE
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>
|
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The <TT
|
|
CLASS="OPTION"
|
|
>–u</TT
|
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> option tells it to use the specified user
|
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name rather than prompting for it.<A
|
|
NAME="X-087-2-FNUU16"
|
|
HREF="#FTN.X-087-2-FNUU16"
|
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>[3]</A
|
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> </P
|
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><P
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>To protect your UUCP users from callers who might give a false system name and
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snarf all their mail, you should add
|
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<B
|
|
CLASS="COMMAND"
|
|
>called-login</B
|
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> commands to each system
|
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entry in the <TT
|
|
CLASS="FILENAME"
|
|
>sys</TT
|
|
> file. This is described in the next
|
|
section.</P
|
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></DIV
|
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><DIV
|
|
CLASS="SECT2"
|
|
><H2
|
|
CLASS="SECT2"
|
|
><A
|
|
NAME="X-087-2-UUCP.SECURITY.CALLED-LOGIN"
|
|
>16.4.2. Protecting Yourself Against Swindlers</A
|
|
></H2
|
|
><P
|
|
>
|
|
A major problem with UUCP is that the calling system can lie about its name;
|
|
it announces its name to the called system after logging in, but the server
|
|
doesn't have any way to check it. Thus, an attacker could log into his or her
|
|
own UUCP account, pretend to be someone else, and pick up that other site's
|
|
mail. This is particularly troublesome if you offer login via anonymous UUCP,
|
|
where the password is made public.</P
|
|
><P
|
|
>You <I
|
|
CLASS="EMPHASIS"
|
|
>must</I
|
|
> guard against this sort of impostor. The cure
|
|
for this disease is to require each system to use a particular login name
|
|
by specifying a <SPAN
|
|
CLASS="SYSTEMITEM"
|
|
>called-login</SPAN
|
|
> in
|
|
<TT
|
|
CLASS="FILENAME"
|
|
>sys</TT
|
|
>. A sample system entry may look like this:
|
|
|
|
<TABLE
|
|
BORDER="0"
|
|
BGCOLOR="#E0E0E0"
|
|
WIDTH="100%"
|
|
><TR
|
|
><TD
|
|
><PRE
|
|
CLASS="SCREEN"
|
|
>system pablo
|
|
... usual options ...
|
|
called-login Upablo</PRE
|
|
></TD
|
|
></TR
|
|
></TABLE
|
|
></P
|
|
><P
|
|
>The upshot is that whenever a system logs in and pretends it is
|
|
<SPAN
|
|
CLASS="SYSTEMITEM"
|
|
>pablo</SPAN
|
|
>,
|
|
<B
|
|
CLASS="COMMAND"
|
|
>uucico</B
|
|
> checks whether it has logged in as
|
|
<SPAN
|
|
CLASS="SYSTEMITEM"
|
|
>Upablo</SPAN
|
|
>. If it hasn't, the
|
|
calling system is turned down, and the connection is dropped. You
|
|
should make it a habit to add the <B
|
|
CLASS="COMMAND"
|
|
>called-login</B
|
|
> command to every system entry
|
|
you add to your <TT
|
|
CLASS="FILENAME"
|
|
>sys</TT
|
|
> file. It is important that
|
|
you do this for <I
|
|
CLASS="EMPHASIS"
|
|
>all</I
|
|
> systems in your
|
|
<B
|
|
CLASS="COMMAND"
|
|
>sys</B
|
|
> file, regardless of whether they will ever call
|
|
your site or not. For those sites that never call you, you should
|
|
probably set <SPAN
|
|
CLASS="SYSTEMITEM"
|
|
>called-login</SPAN
|
|
> to
|
|
some totally bogus user name, such as <SPAN
|
|
CLASS="SYSTEMITEM"
|
|
>neverlogsin</SPAN
|
|
>.</P
|
|
></DIV
|
|
><DIV
|
|
CLASS="SECT2"
|
|
><H2
|
|
CLASS="SECT2"
|
|
><A
|
|
NAME="AEN13578"
|
|
>16.4.3. Be Paranoid: Call Sequence Checks</A
|
|
></H2
|
|
><P
|
|
> Another way to fend off and detect impostors is to use <B
|
|
CLASS="COMMAND"
|
|
>call sequence
|
|
checks</B
|
|
>. These help you protect against intruders who somehow manage to find out the password with which you log into your UUCP system.</P
|
|
><P
|
|
>When using call sequence checks, both machines keep track of the number of
|
|
connections established so far. The counter is incremented with each
|
|
connection. After logging in, the caller sends its call sequence number, and
|
|
the receiver checks it against its own number. If they don't match, the
|
|
connection attempt is rejected. If the initial number is chosen at
|
|
random, attackers will have a hard time guessing the correct call sequence
|
|
number.</P
|
|
><P
|
|
>But call sequence checks do more for you. Even if some very clever
|
|
person should detect your call sequence number as well as your password, you
|
|
will find out. When the attacker calls your UUCP feed and steals your
|
|
mail, this will increase the feeds call sequence number by one. The next time
|
|
<I
|
|
CLASS="EMPHASIS"
|
|
>you</I
|
|
> call your feed and try to log in, the remote
|
|
<B
|
|
CLASS="COMMAND"
|
|
>uucico</B
|
|
> will refuse you, because the numbers don't match
|
|
anymore!</P
|
|
><P
|
|
>If you have enabled call sequence checks, you should check your log files
|
|
regularly for error messages that hint at possible attacks. If your system
|
|
rejects the call sequence number the calling system offers,
|
|
<B
|
|
CLASS="COMMAND"
|
|
>uucico</B
|
|
> will put a message into the log file saying
|
|
something like, “Out of sequence call rejected.” If your system
|
|
is rejected by its feed because the sequence numbers are out of sync, it
|
|
will put a message in the log file saying, “Handshake failed
|
|
(RBADSEQ).”</P
|
|
><P
|
|
>To enable call sequence checks, add the following command to the
|
|
system entry:
|
|
|
|
<TABLE
|
|
BORDER="0"
|
|
BGCOLOR="#E0E0E0"
|
|
WIDTH="100%"
|
|
><TR
|
|
><TD
|
|
><PRE
|
|
CLASS="SCREEN"
|
|
># enable call sequence checks
|
|
sequence true</PRE
|
|
></TD
|
|
></TR
|
|
></TABLE
|
|
></P
|
|
><P
|
|
> In addition, you have to create the file containing the sequence
|
|
number itself. Taylor UUCP keeps the sequence number in a file called
|
|
<TT
|
|
CLASS="FILENAME"
|
|
>.Sequence</TT
|
|
> in the remote site's spool
|
|
directory. It <I
|
|
CLASS="EMPHASIS"
|
|
>must</I
|
|
> be owned by <SPAN
|
|
CLASS="SYSTEMITEM"
|
|
>uucp</SPAN
|
|
> and must be mode 600 (i.e., readable
|
|
and writeable only by <SPAN
|
|
CLASS="SYSTEMITEM"
|
|
>uucp</SPAN
|
|
>). It
|
|
is best to initialize this file with an arbitrary, previously
|
|
agreed-upon start value. A simple way to create this file is:
|
|
|
|
<TABLE
|
|
BORDER="0"
|
|
BGCOLOR="#E0E0E0"
|
|
WIDTH="100%"
|
|
><TR
|
|
><TD
|
|
><PRE
|
|
CLASS="SCREEN"
|
|
># <TT
|
|
CLASS="USERINPUT"
|
|
><B
|
|
>cd /var/spool/uucp/pablo</B
|
|
></TT
|
|
>
|
|
# <TT
|
|
CLASS="USERINPUT"
|
|
><B
|
|
>echo 94316 > .Sequence</B
|
|
></TT
|
|
>
|
|
# <TT
|
|
CLASS="USERINPUT"
|
|
><B
|
|
>chmod 600 .Sequence</B
|
|
></TT
|
|
>
|
|
# <TT
|
|
CLASS="USERINPUT"
|
|
><B
|
|
>chown uucp.uucp .Sequence</B
|
|
></TT
|
|
></PRE
|
|
></TD
|
|
></TR
|
|
></TABLE
|
|
></P
|
|
><P
|
|
>Of course, the remote site has to enable call sequence checks as well and
|
|
start by using exactly the same sequence number as you.</P
|
|
></DIV
|
|
><DIV
|
|
CLASS="SECT2"
|
|
><H2
|
|
CLASS="SECT2"
|
|
><A
|
|
NAME="AEN13611"
|
|
>16.4.4. Anonymous UUCP</A
|
|
></H2
|
|
><P
|
|
>
|
|
|
|
If you want to provide anonymous UUCP access to your system, you first have to
|
|
set up a special account for it as previously described. A common practice
|
|
is to give the anonymous account a login name and a password of
|
|
<SPAN
|
|
CLASS="SYSTEMITEM"
|
|
>uucp</SPAN
|
|
>.</P
|
|
><P
|
|
>In addition, you have to set a few of the security options for unknown systems.
|
|
For instance, you may want to prohibit them from executing any commands on
|
|
your system. However, you cannot set these parameters in a
|
|
<TT
|
|
CLASS="FILENAME"
|
|
>sys</TT
|
|
> file entry because the
|
|
<B
|
|
CLASS="COMMAND"
|
|
>system</B
|
|
> command requires the system's
|
|
name, which you don't have. Taylor UUCP solves this dilemma through the
|
|
<B
|
|
CLASS="COMMAND"
|
|
>unknown</B
|
|
> command.
|
|
<B
|
|
CLASS="COMMAND"
|
|
>unknown</B
|
|
> can be used in the
|
|
<TT
|
|
CLASS="FILENAME"
|
|
>config</TT
|
|
> file to specify any command that can usually
|
|
appear in a system entry:
|
|
|
|
<TABLE
|
|
BORDER="0"
|
|
BGCOLOR="#E0E0E0"
|
|
WIDTH="100%"
|
|
><TR
|
|
><TD
|
|
><PRE
|
|
CLASS="SCREEN"
|
|
>unknown remote-receive ~/incoming
|
|
unknown remote-send ~/pub
|
|
unknown max-remote-debug none
|
|
unknown command-path /usr/lib/uucp/anon-bin
|
|
unknown commands rmail</PRE
|
|
></TD
|
|
></TR
|
|
></TABLE
|
|
></P
|
|
><P
|
|
>This will restrict unknown systems to downloading files from below the
|
|
<TT
|
|
CLASS="FILENAME"
|
|
>pub</TT
|
|
> directory and uploading files to the
|
|
<TT
|
|
CLASS="FILENAME"
|
|
>incoming</TT
|
|
> directory below
|
|
<TT
|
|
CLASS="FILENAME"
|
|
>/var/spool/uucppublic</TT
|
|
>. The next line will make
|
|
<B
|
|
CLASS="COMMAND"
|
|
>uucico</B
|
|
> ignore any requests from the remote system to
|
|
turn on debugging locally. The last two lines permit unknown systems to
|
|
execute <B
|
|
CLASS="COMMAND"
|
|
>rmail</B
|
|
> ; but the command path specified makes
|
|
<B
|
|
CLASS="COMMAND"
|
|
>uucico</B
|
|
> look for the <B
|
|
CLASS="COMMAND"
|
|
>rmail</B
|
|
> command in
|
|
a private directory named <TT
|
|
CLASS="FILENAME"
|
|
>anon-bin</TT
|
|
> only. This restriction
|
|
allows you to provide some special <B
|
|
CLASS="COMMAND"
|
|
>rmail</B
|
|
> that, for instance,
|
|
forwards all mail to the superuser for examination. This allows anonymous
|
|
users to reach the maintainer of the system, but at the same time prevents
|
|
them from injecting any mail to other sites.</P
|
|
><P
|
|
>To enable anonymous UUCP, you must specify at least one
|
|
<SPAN
|
|
CLASS="SYSTEMITEM"
|
|
>unknown</SPAN
|
|
> statement in
|
|
<TT
|
|
CLASS="FILENAME"
|
|
>config</TT
|
|
>. Otherwise <B
|
|
CLASS="COMMAND"
|
|
>uucico</B
|
|
> will
|
|
reject all unknown systems.</P
|
|
></DIV
|
|
></DIV
|
|
><H3
|
|
CLASS="FOOTNOTES"
|
|
>Notes</H3
|
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><TABLE
|
|
BORDER="0"
|
|
CLASS="FOOTNOTES"
|
|
WIDTH="100%"
|
|
><TR
|
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><TD
|
|
ALIGN="LEFT"
|
|
VALIGN="TOP"
|
|
WIDTH="5%"
|
|
><A
|
|
NAME="FTN.X-087-2-FNUU14"
|
|
HREF="x-087-2-uucp.dialin.html#X-087-2-FNUU14"
|
|
>[1]</A
|
|
></TD
|
|
><TD
|
|
ALIGN="LEFT"
|
|
VALIGN="TOP"
|
|
WIDTH="95%"
|
|
><P
|
|
> Note that <B
|
|
CLASS="COMMAND"
|
|
>tcpd</B
|
|
> usually
|
|
has mode 700, so that you must invoke it as user <SPAN
|
|
CLASS="SYSTEMITEM"
|
|
>root</SPAN
|
|
>, not <SPAN
|
|
CLASS="SYSTEMITEM"
|
|
>uucp</SPAN
|
|
>. <B
|
|
CLASS="COMMAND"
|
|
>tcpd</B
|
|
> is discussed
|
|
in more detail in <A
|
|
HREF="x-087-2-appl.html"
|
|
>Chapter 12</A
|
|
>.</P
|
|
></TD
|
|
></TR
|
|
><TR
|
|
><TD
|
|
ALIGN="LEFT"
|
|
VALIGN="TOP"
|
|
WIDTH="5%"
|
|
><A
|
|
NAME="FTN.X-087-2-FNUU15"
|
|
HREF="x-087-2-uucp.dialin.html#X-087-2-FNUU15"
|
|
>[2]</A
|
|
></TD
|
|
><TD
|
|
ALIGN="LEFT"
|
|
VALIGN="TOP"
|
|
WIDTH="95%"
|
|
><P
|
|
>Gert Doering's <B
|
|
CLASS="COMMAND"
|
|
>mgetty</B
|
|
> is such a beast. It runs on a
|
|
variety of platforms, including SCO Unix, AIX, SunOS, HP-UX, and Linux.</P
|
|
></TD
|
|
></TR
|
|
><TR
|
|
><TD
|
|
ALIGN="LEFT"
|
|
VALIGN="TOP"
|
|
WIDTH="5%"
|
|
><A
|
|
NAME="FTN.X-087-2-FNUU16"
|
|
HREF="x-087-2-uucp.dialin.html#X-087-2-FNUU16"
|
|
>[3]</A
|
|
></TD
|
|
><TD
|
|
ALIGN="LEFT"
|
|
VALIGN="TOP"
|
|
WIDTH="95%"
|
|
><P
|
|
>This option is not present in Version 1.04.</P
|
|
></TD
|
|
></TR
|
|
></TABLE
|
|
><DIV
|
|
CLASS="NAVFOOTER"
|
|
><HR
|
|
ALIGN="LEFT"
|
|
WIDTH="100%"><TABLE
|
|
WIDTH="100%"
|
|
BORDER="0"
|
|
CELLPADDING="0"
|
|
CELLSPACING="0"
|
|
><TR
|
|
><TD
|
|
WIDTH="33%"
|
|
ALIGN="left"
|
|
VALIGN="top"
|
|
><A
|
|
HREF="x-087-2-uucp.permissions.html"
|
|
>Prev</A
|
|
></TD
|
|
><TD
|
|
WIDTH="34%"
|
|
ALIGN="center"
|
|
VALIGN="top"
|
|
><A
|
|
HREF="index.html"
|
|
>Home</A
|
|
></TD
|
|
><TD
|
|
WIDTH="33%"
|
|
ALIGN="right"
|
|
VALIGN="top"
|
|
><A
|
|
HREF="x-087-2-uucp.protocols.html"
|
|
>Next</A
|
|
></TD
|
|
></TR
|
|
><TR
|
|
><TD
|
|
WIDTH="33%"
|
|
ALIGN="left"
|
|
VALIGN="top"
|
|
>Controlling Access to UUCP Features</TD
|
|
><TD
|
|
WIDTH="34%"
|
|
ALIGN="center"
|
|
VALIGN="top"
|
|
><A
|
|
HREF="x-087-2-uucp.html"
|
|
>Up</A
|
|
></TD
|
|
><TD
|
|
WIDTH="33%"
|
|
ALIGN="right"
|
|
VALIGN="top"
|
|
>UUCP Low-Level Protocols</TD
|
|
></TR
|
|
></TABLE
|
|
></DIV
|
|
></BODY
|
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></HTML
|
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> |