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<!DOCTYPE html>
<html dir="ltr" lang="en">
<head>
<meta charset='utf-8'>
<title>2.2.4. Samhain</title>
</head>
<body>
<a href="index.html">Core OS Index</a>
<h1 id="samhain">2.2.4. Samhain</h1>
<p>Read
<a href="http://www.la-samhna.de/samhain/manual/">Samhain Manual</a>,
samhain is a file and host integrity and intrusion alert system
suitable for single hosts as well as for large, UNIX-based networks.
samhain offers advanced features to support and facilitate
centralized monitoring.</p>
<p>The client (or standalone) part is called samhain, while the
server is referred to as yule. Both can run as daemon processes.</p>
<p>Most of the options require being defined at compile time, is
easy to start with basic and then compile as more features are
required.</p>
<pre>
$ sudo prt-get depinst samhain
</pre>
<dl>
<dt>/var/lib/samhain/samhain_file</dt>
<dd>signature database</dd>
<dt>/etc/samhainrc</dt>
<dd>configuration file</dd>
<dt>/var/log/samhain.log</dt>
<dd>log file</dd>
</dl>
<h2 id="conf">2.2.4.1. Configure</h2>
<p>For more information on configuration check
<a href="http://www.la-samhna.de/samhain/manual/filedef.htm">Monitoring Policies</a>.
Description of section headings;</p>
<dl>
<dt>ReadOnly</dt>
<dd>All modifications except access times will be
reported for these files.</dd>
<dd>Checked: owner, group, permissions, file type, device number,
hardlinks, links, inode, checksum, size, mtime, ctime.</dd>
<dt>LogFiles</dt>
<dd>Modifications of timestamps, file size, and signature will be
ignored.</dd>
<dd>Checked: owner, group, permissions, file type, device number,
hardlinks, links, inode.<dd>
<dt>GrowingLogFiles</dt>
<dd>Modifications of timestamps, and signature will be ignored.
Modification of the file size will only be ignored if the file size
has increased.</dd>
<dd>Checked: owner, group, permissions, file type, device number,
hardlinks, links, inode, size >= previous_size, checksum(file start
up to previous size) equals previous checksum.</dd>
<dt>Attributes</dt>
<dd>Only modifications of ownership, access permissions, and device
number will be checked.</dd>
<dd>Checked: owner, group, permissions, file type, device number.</dd>
<dt>IgnoreAll</dt>
<dd>No modifications will be reported. However, the existence of the
specified file or directory will still be checked.</dd>
<dt>IgnoreNone</dt>
<dd>All modifications, including access time, but excluding ctime, will
be reported - checking atime and ctime would require to play with
the system clock.</dd>
<dd>Checked: owner, group, permissions, file type, device number,
hardlinks, links, inode, checksum, size, mtime, atime.</dd>
</dl>
<pre>
$ vim /etc/samhainrc
</pre>
<p>This is just a resume, there is a complete template
on crux ports?.</p>
<pre>
[Misc]
[ReadOnly]
dir = 0/
[Attributes]
file = /tmp
file = /dev
file = /media
file = /proc
file = /sys
[ReadOnly]
dir = 99/etc
[Attributes]
file = /etc/mtab
file = /etc/adjtime
file = /etc/motd
file = /etc/fstab
file = /etc
[ReadOnly]
dir = 99/boot
[ReadOnly]
dir = 99/bin
dir = 99/sbin
[ReadOnly]
dir = 99/lib
[Attributes]
dir = 99/dev
[IgnoreAll]
dir = -1/dev/pts
[ReadOnly]
dir = 99/usr
[IgnoreAll]
dir = -1/usr/ports/core
dir = -1/usr/ports/opt
dir = -1/usr/ports/contrib
dir = -1/usr/ports/work
dir = -1/usr/ports/distfiles
[ReadOnly]
dir = 99/var
[IgnoreAll]
dir = -1/var/cache
dir = -1/var/lock
dir = -1/var/mail
dir = -1/var/run
dir = -1/var/spool
dir = -1/var/tmp
[Attributes]
file = /var/lib/mlocate
file = /var/lib/mlocate/mlocate.db
file = /var/lib/urandom
file = /var/lib/urandom/seed
[GrowingLogFiles]
dir = 99/var/log
file = /var/log/samhain.log.lock
[Attributes]
file = /var/log/old/*.[0-9].gz
[Misc]
IgnoreAdded = /var/log/.*\.[0-9]+$
IgnoreAdded = /var/log/.*\.[0-9]+\.gz$
IgnoreAdded = /var/log/.*\.[0-9]+\.log$
IgnoreAdded = /var/log/[[:alnum:]]+/.*\.[0-9]+$
IgnoreAdded = /var/log/[[:alnum:]]+/.*\.[0-9]+\.gz$
IgnoreAdded = /var/log/[[:alnum:]]+/.*\.[0-9]+\.log$
IgnoreAdded = /var/lib/slocate/slocate.db.tmp
IgnoreMissing = /var/lib/slocate/slocate.db.tmp
[IgnoreNone]
[Prelink]
[User0]
[User1]
[EventSeverity]
[Log]
MailSeverity=notice
PrintSeverity=none
[Misc]
Daemon = yes
ChecksumTest=check
SetNiceLevel = 19
SetIOLimit = 500
SetLoopTime = 600
SetFileCheckTime = 7200
ReportOnlyOnce = True
SetMailTime = 86400
SetMailNum = 10
SetMailAddress=root@localhost
SyslogFacility=LOG_LOCAL2
</pre>
<p>Initialize database;</p>
<pre>
# samhain -t init -p notice
</pre>
<p>If you want to "restart" remove samhain_file and run again
the command above. If daemon is set on config file you just
need to run;</p>
<pre>
# samhain -t check -p notice
</pre>
<p>To control daemon;</p>
<pre>
# samhain stop
# samhain start
# samhain restart
# samhain reload or force-reload
# samhain status
</pre>
<h2 id="updatedb">2.2.4.2. Update database</h2>
<p><a href="http://www.la-samhna.de/samhain/manual/updating-the-file-signature-database.html">Manual</a>,
You can update the database while the daemon is running, as long
as you don't interfere with its logging. Using flag -l like this
samhain -t update -l none make sure the log file is not accessed.</p>
<pre>
# samhain -t update -l none --interactive
</pre>
<p>Interactive update are supported with the command line flag
--interactive. A file with a list of good files, absolute path,
one per line, can be passed with flag --listfile. Example;</p>
<pre>
# samhain -t update -l none --listfile=/root/list_of_files
</pre>
<a href="index.html">Core OS Index</a>
<p>
This is part of the c9-doc Manual.
Copyright (C) 2017
c9 team.
See the file <a href="../fdl-1.3-standalone.html">Gnu Free Documentation License</a>
for copying conditions.</p>
</body>
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