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><H1
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><A
NAME="RADIUS"
>3. Radius authentication using LDAP</A
></H1
><P
>A Radius Server, is a daemon for un*x operating systems which allows one
to set up (guess what!) a radius protocol server, which is usually used for
authentication and accounting of dial-up users. To use server, you also need a
correctly setup client which will talk to it, usually a terminal server or a PC
with appropriate which emulates it (PortSlave, radiusclient etc). [From the
freeradius FAQ] </P
><P
>Radius has its own database of users, anyway, since this information is
already contained in LDAP, it will be more convenient to use it!</P
><P
>There are several freeware Radius servers, the one that has good support
for LDAP is the FreeRadius server (<A
HREF="http://www.freeradius.org"
TARGET="_top"
>http://www.freeradius.org</A
>), it is still
a development version, anyway the LDAP module works fine.</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN352"
>3.1. FreeRadius Radiusd configuration</A
></H2
><P
>Once you have installed the server you have to configure it using the
configuration files, that are located under <TT
CLASS="FILENAME"
>/etc/raddb</TT
> (or
<TT
CLASS="FILENAME"
>/usr/local/etc/raddb</TT
>) </P
><P
>In the <TT
CLASS="FILENAME"
>radiusd.conf</TT
> file edit : </P
><P
><TABLE
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><TD
><PRE
CLASS="PROGRAMLISTING"
>[...omissis]
# Uncomment this if you want to use ldap (Auth-Type = LDAP)
# Also uncomment it in the authenticate{} block below
ldap {
server = ldap.yourorg.com
#login = "cn=admin,o=My Org,c=US"
#password = mypass
basedn = "ou=users,dc=yourorg,dc=com"
filter = "(posixAccount)(uid=%u))"
}
[...omissis]
# Authentication types, Auth-Type = System and PAM for now.
authenticate {
pam
unix
# sql
# sql2
# Uncomment this if you want to use ldap (Auth-Type = LDAP)
ldap
}
[...omissis]</PRE
></TD
></TR
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></P
><P
>Also edit the <TT
CLASS="FILENAME"
>dictionary</TT
> file:</P
><P
><TABLE
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><TD
><PRE
CLASS="PROGRAMLISTING"
>[...omissis]
#
# Non-Protocol Integer Translations
#
VALUE Auth-Type Local 0
VALUE Auth-Type System 1
VALUE Auth-Type SecurID 2
VALUE Auth-Type Crypt-Local 3
VALUE Auth-Type Reject 4
VALUE Auth-Type ActivCard 4
VALUE Auth-Type LDAP 5
[...omissis]</PRE
></TD
></TR
></TABLE
></P
><P
> And the <TT
CLASS="FILENAME"
>users</TT
> file to have a default authorization
entry:</P
><P
><TABLE
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><TD
><PRE
CLASS="PROGRAMLISTING"
>[...omissis]
DEFAULT Auth-Type := LDAP
Fall-Through = 1
[...omissis]</PRE
></TD
></TR
></TABLE
></P
><P
>If you alreay set up an LDAP server for Un*x accounts management, this
is enough.</P
><P
>On the LDAP server ensure also that the radius server can read the all
the posixAccount attributes (expecially <TT
CLASS="FILENAME"
>uid</TT
> and
<TT
CLASS="FILENAME"
>userpassword</TT
>).</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN373"
>3.2. Testing Radius Authentication</A
></H2
><P
>To test everything server start <TT
CLASS="FILENAME"
>radiusd</TT
> in debugging
mode:</P
><P
><TABLE
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><TD
><PRE
CLASS="PROGRAMLISTING"
>/usr/local/sbin/radiusd -X -A</PRE
></TD
></TR
></TABLE
></P
><P
>Then use the <TT
CLASS="FILENAME"
>radtest</TT
> program whith a syntax like</P
><P
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><TD
><PRE
CLASS="PROGRAMLISTING"
>radtest username "password" radius.yourorg.com 1 testing123 </PRE
></TD
></TR
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></P
><P
>If everything went fine you should receive an Acces-Accept packet from the
Radius server.</P
><P
>You can also use stunnel in client mode to provide SSL in the connection
between the Radius server and the LDAPS server. For details on SSL refer to
<A
HREF="ssl.html"
>Section 10</A
>.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN386"
>3.3. Sample CISCO IOS Configuration</A
></H2
><P
>Just for completeness, here is a sample Cisco IOS configuration. Anyway,
this is outside the purpose of the HOWTO so it may not suit your needs.</P
><P
><TABLE
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><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>[...omissis]
aaa new-model
aaa authentication login default radius enable
aaa authentication ppp default radius
aaa authorization network radius
[...omissis]
radius-server host 192.168.10.1
radius-server timeout 10
radius-server key cisco
[...omissis]</PRE
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><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>Almost all NAS use port 1645 for radius, check it out and configure
the server appropriately.</P
></BLOCKQUOTE
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