Virus:Additional Signatures

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#!/bin/sh
# script to install Bill Landry's <bill at inetmsg dot com> scripts
# for maintaining Sanesecurity signatures for clamav
# Copyright (C) 2009 Eric Shubert <ejs@shubes.net>
########################################################################
#  8/23/12 Changed WEB_LOC to sourceforge host
#  4/30/10 Amendments to install on SME Server - commented with SME
#  9/25/09 Totally refactored by Eric Shubert <ejs@shubes.net>
#  3/22/09 Originally Written by Jake Vickers <jake@qmailtoaster.com>
#
WEB_LOC=http://sourceforge.net/projects/unofficial-sigs/files/latest/download?source=files
PKG_NAME=clamav-unofficial-sigs
PKG_TGZ=$PKG_NAME.tar.gz
# SME = changed variable name throughout and directory name
SANE_DIR=/opt/sanesecurity

########################################################################
# initialization processing
#
a1_initialization(){

# Make sure we're root
if [ "$UID" != "0" ]; then
  echo "Error: You are not logged in as root, please su -"
  exit 1
fi 

# remove files from previous version
# SME - changed cron job from .sh to .cron, added removal of .sh script and redundant dbs
rm -rf /etc/unofficial-clamav-sigs.conf \
 /etc/cron.hourly/unofficial-clamav-sigs.cron \
 /usr/unofficial-dbs \
 /usr/bin/unofficial-clamav-sigs.sh \
 /var/clamav/*.ndb \
 /var/clamav/*.ldb \
 /var/clamav/*.ftm \
 /var/clamav/*.hdb 

# set a temp directory for the tar file. $$ is the current shell ID.
TEMP_DIR=$(tempfile 2>/dev/null) || TEMP_DIR=/tmp/$me.$$ 

# make sure the temp directory is deleted when we're done
trap "rm -rf $TEMP_DIR" 0 1 2 5 15
}

###################################################################
## download and unpack current package
#
a3_download_unpack(){

rm -rf $TEMP_DIR
mkdir -p $TEMP_DIR
echo "$me $myver - getting latest version of $PKG_NAME ..."

wget -O $TEMP_DIR/$PKG_TGZ $WEB_LOC

if [ "$?" != "0" ]; then
  echo "$me - unable to reach $WEB_LOC/$PKG_TGZ, please try again later."
  exit 1
fi

tar -xz -C $TEMP_DIR -f $TEMP_DIR/$PKG_TGZ
}

###################################################################
## install the package files
#
a5_install_files(){

# SME - Added make directories
mkdir -p $SANE_DIR/bin
mkdir -p $SANE_DIR/etc
mkdir -p $SANE_DIR/man

# install the shell script
cp $TEMP_DIR/$PKG_NAME-*/$PKG_NAME.sh $SANE_DIR/bin/$PKG_NAME.sh
chmod 755 $SANE_DIR/bin/$PKG_NAME.sh
ln -sf ../..$SANE_DIR/bin/$PKG_NAME.sh /usr/sbin/$PKG_NAME.sh

# install the configuration file
# SME - removed substitutions for clamd reload - reload_opt and reload_dbs
# SME - removed substitution to change default dbs download directory
# SME - added substitution to set clamd_socket location
# SME - removed substitution to silence information output - but see cron job below

cat $TEMP_DIR/$PKG_NAME-*/$PKG_NAME.conf | sed \
    -e "s|/var/lib/clamav|/var/clamav|" \
    -e "/#clamd_socket=/aclamd_socket=\"/var/clamav/clamd.socket\"" \
    -e "s|enable_logging=\"no\"|enable_logging=\"yes\"|" \
    -e "s|log_file_path=\"/var/log\"|log_file_path=\"/var/log/clamav\"|" \
    -e "s|log_file_name=\"clamav-unofficial|log_file_name=\"unofficial|" \
    -e "s|configuration_complete=\"no\"|configuration_complete=\"yes\"|" \
    > $SANE_DIR/etc/$PKG_NAME.conf
ln -sf ../..$SANE_DIR/etc/$PKG_NAME.conf /etc/$PKG_NAME.conf

# install the man page
gzip $TEMP_DIR/$PKG_NAME-*/$PKG_NAME.8
cp $TEMP_DIR/$PKG_NAME-*/$PKG_NAME.8.gz $SANE_DIR/man/$PKG_NAME.8.gz
ln -sf ../../../..$SANE_DIR/man/$PKG_NAME.8.gz /usr/share/man/man8/$PKG_NAME.8.gz

# install the cron job (cannot symlink cron jobs)
grep "^#" $TEMP_DIR/$PKG_NAME-*/$PKG_NAME-cron \
    > /etc/cron.d/$PKG_NAME-cron
# SME - added redirect stdout to null device and stderr to stdout so we only get error output from cron job
echo -e "\n25 * * * * root /usr/sbin/$PKG_NAME.sh >/dev/null 2>&1" \
    >>/etc/cron.d/$PKG_NAME-cron

# install the logrotate spec
cat $TEMP_DIR/$PKG_NAME-*/$PKG_NAME-logrotate | sed \
    -e "s|clamav-unofficial|clamav/unofficial|" \
    > $SANE_DIR/etc/$PKG_NAME-logrotate
ln -sf ../..$SANE_DIR/etc/$PKG_NAME-logrotate /etc/logrotate.d/$PKG_NAME-logrotate

# install documentation files
# SME - removed superfluous $PKG_NAME sub-directory below $SANE_DIR/doc
mkdir -p $SANE_DIR/doc
mv $TEMP_DIR/$PKG_NAME-*/CHANGELOG $SANE_DIR/doc/CHANGELOG
mv $TEMP_DIR/$PKG_NAME-*/INSTALL   $SANE_DIR/doc/INSTALL
mv $TEMP_DIR/$PKG_NAME-*/LICENSE   $SANE_DIR/doc/LICENSE
mv $TEMP_DIR/$PKG_NAME-*/README    $SANE_DIR/doc/README
}

###################################################################
## main script execution begins here
#
me=${0##*/}
myver=v0.3.1-1 

a1_initialization

a3_download_unpack

a5_install_files

echo "$PKG_NAME installed successfully"
echo "clamav database files provided by Sanesecurity will be updated within an hour,"
echo " and continuously after that."
exit 0

Virus:Additional Signatures

Contents

Anti Virus - Additional Signatures

Introduction

Installation

Operation

Documentation

Signature Databases

Uninstall

Old Installation Notes

References

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	Skill level: Medium
	The instructions on this page require a basic knowledge of linux.

	Note:
	Please note that there now is a contrib for adding additional signatures. It is available from the fws repo called smeserver-clamav-unofficial-sigs.

	Note:
	Please be aware that these additional signatures can in rare cases contain false positives causing good emails to be caught. This has only been noticed once in 18 months for some hours though.

	Note:
	Running sanesecurity-install.sh again will download the latest Sane Security .tar.gz package and unpack/install it. This will overwrite the existing files, including /etc/clamav-unofficial-sigs.conf and any manual adjustments you may have made to the list of databases you want to be downloaded

	Note:
	If removing databases from the download lists, don't forget to also delete them from /var/clamav and /usr/unofficial_dbs if they have been downloaded previously and exist

	Note:
	Adding unofficial signatures increases memory usage. To increase the clamd memory limit try setting MemLimit to a value greater than 300000000 (see here for reference). Since clamav-0.96 and smeserver-clamav-2.0.0-8 the default MemLimit for clamd has been 600000000 and should be sufficient.