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><H1
><A
NAME="YULE"
></A
>Chapter 6. Configuring <SPAN
CLASS="APPLICATION"
>yule</SPAN
>, the log server</H1
><P
><SPAN
CLASS="APPLICATION"
>yule</SPAN
> is the log server within the
<SPAN
CLASS="APPLICATION"
>samhain</SPAN
> file integrity monitoring
system. <SPAN
CLASS="APPLICATION"
>yule</SPAN
> is part of the distribution
package. It is only required
if you intend to use the client/server capability of
the <SPAN
CLASS="APPLICATION"
>samhain</SPAN
> system
for centralized logging to <SPAN
CLASS="APPLICATION"
>yule</SPAN
>.</P
><DIV
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><P
></P
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><B
>Important</B
></TH
></TR
><TR
><TD
> </TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>Client and server are <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>distict</I
></SPAN
> applications, and must be
built seperately. By default, installation names and paths (e.g.
the configuration file) are
different. Do not blame us if you abuse './configure' options to
cause name clashes, if you install both on the same host.</P
><P
>To compile <SPAN
CLASS="APPLICATION"
>yule</SPAN
>, you must
use <B
CLASS="COMMAND"
>./configure --enable-network=server</B
>. To compile
a <SPAN
CLASS="APPLICATION"
>samhain</SPAN
> client, you must
use <B
CLASS="COMMAND"
>./configure --enable-network=client</B
>.</P
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CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="GENERAL"
>6.1. General</A
></H1
><P
><SPAN
CLASS="APPLICATION"
>yule</SPAN
> is a non-forking server.
Instead of forking a new process for each
incoming logging request, it multiplexes connections internally. Apart
from <SPAN
CLASS="APPLICATION"
>samhain</SPAN
> client reports
(see below), <SPAN
CLASS="APPLICATION"
>yule</SPAN
> (version 1.2.8+) can
also collect syslog reports by listening on port 514/udp, if compiled
with this option enabled (see also <B
CLASS="COMMAND"
>man syslogd</B
>.</P
><P
>Each potential client must be <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>registered</I
></SPAN
>
with <SPAN
CLASS="APPLICATION"
>yule</SPAN
> to make a connection
(see <A
HREF="file-monitor.html#BASCLT"
>Section 5.1</A
>> and the example below). The client tells its
host name to the server, and the server verifies it against the peer of the
connecting socket.
On the first connection made by a client, an authentication protocol
is performed. This protocol provides
<SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>mutual authentication</I
></SPAN
> of client and
server, as well as a fresh <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>session key</I
></SPAN
> .</P
><P
>By default, all messages are encrypted using Rijndael (selected as the
Advanced Encryption Standard (AES) algorithm). The 192-bit key
version of the algorithm is used. There is a compile-time option to switch
off encryption, if your local lawmakers don't allow to use it (see Appendix).</P
><P
><SPAN
CLASS="APPLICATION"
>yule</SPAN
> keeps track of all clients
and their session keys. As
connections are dropped after successful completion of message delivery,
there is no limit on the total number of clients. There is, however,
a limit on the maximum number of <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>simultaneous</I
></SPAN
>
connections. This limit
depends on the operating system, but may be of order 1000.</P
><P
>Session key expire after two hours. If its session key is expired, the
client is forced to repeat the authentication protocol to set up a fresh
session key.</P
><P
>Incoming messages are signed by the client. On receipt, <SPAN
CLASS="APPLICATION"
>yule</SPAN
> will:</P
><P
><P
></P
><OL
TYPE="1"
><LI
><P
> check the signature,
</P
></LI
><LI
><P
> accept the message if the signature can be verified,
otherwise discard it and issue an error message,
</P
></LI
><LI
><P
> discard the clients signature,
</P
></LI
><LI
><P
> log the message, and the client's hostname, to the console
and the log file, and
</P
></LI
><LI
><P
> add its own signature to the log file entry.
</P
></LI
></OL
></P
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