121 lines
3.5 KiB
Bash
121 lines
3.5 KiB
Bash
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#!/bin/sh
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#
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# this script is part of the building process of the cryptobox
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# the "normal" action is necessary for every cryptobox (development & release)
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# the "secure" action is mandatory for every release CD
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#
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# called by:
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# - cbox-build.sh after copying custom files and before creating the iso image
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#
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set -eu
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# parse config file
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. /etc/cryptobox/cryptobox.conf
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RUNTIMEDIR=/opt/dfsruntime/runtimerd
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TUNDEV=$RUNTIMEDIR/dev/net/tun
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SECURITY_REMOVE_PACKAGES="ssh strace unzip tar zip wget nvi nano gzip curl bzip2 aptitude tasksel elinks vim vim-common"
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DEVEL_REMOVE_PACKAGES="exim4-daemon-light exim4-config exim4-base netkit-inetd telnet ppp pppconfig pppoe pppoeconf"
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# remove rc symlinks for these services
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SERVICES_OFF="ssh samba setserial nviboot mountnfs ntpdate"
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function configure_normal()
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# the usual stuff - not optimized for security
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{
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# set default runlevel to 3
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sed -i 's/^id:2:initdefault/id:3:initdefault/' /etc/inittab
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######### devices ##########
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# create tun device for running under qemu
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if [ ! -e "$TUNDEV" ]
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then mkdir -p `dirname "$TUNDEV"`
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mknod "$TUNDEV" c 10 200
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fi
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######### thttpd ###########
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# change thttpd's config from 'chroot' to 'nochroot' - otherwise no perl script will run
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sed -i "s/^chroot$/nochroot/" /etc/thttpd/thttpd.conf
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# change thttpd-user from www-data to root (permissions for mount, cryptsetup, ...)
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sed -i "s/^user=.*/user=root/" /etc/thttpd/thttpd.conf
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# the thttpd documentations says "nosymlinkcheck" instead of
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# "nosymlink" - TODO: "nosymlink" breaks "/cryptobox" URL!!!
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#sed -i "/symlink/d" /etc/thttpd/thttpd.conf
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#echo "nosymlink" >>/etc/thttpd/thttpd.conf
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########## sshd ############
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if [ -e "/etc/ssh" ]; then
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# allow empty passwords for ssh
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# the daemon is NOT started automatically, so you have to start it
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# manually in case of need - as the root pw is empty and passwd is ro, you
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# have to allow empty passwords for this rare case
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sed -i 's/^PermitEmptyPass.*$/PermitEmptyPasswords yes/' /etc/ssh/sshd_config
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# turn off PAM for ssh, as it prevents the use of empty passwords (stange behaviour)
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sed -i 's/^UsePAM.*$/UsePAM no/' /etc/ssh/sshd_config
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# allow nput of password
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sed -i 's/^PasswordAuthentication.*$/PasswordAuthentication yes/' /etc/ssh/sshd_config
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fi
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# remove unnecessary packages - return true, if no packages were
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# removed
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dpkg --force-all -P $DEVEL_REMOVE_PACKAGES 2>&1 | grep -v "which isn't installed." || true
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# remove symlinks for unwanted services
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for a in $SERVICES_OFF; do
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# echo "Turning off service $a ..."
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find /etc/rc?.d/ -type l -name "[SK][0-9][0-9]$a" | while read b
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do rm "$b"
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done
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done
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# remove deb-files, that were left by dfsbuild
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test -d /opt/packages && rm -r /opt/packages
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return 0
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}
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function configure_secure()
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# remove everything that could weaken security
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# configure_normal should be called too!
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{
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# disable keyboard login
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sed -i '/getty/d' /etc/inittab
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# remove unnecessary packages
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dpkg --force-all -P $SECURITY_REMOVE_PACKAGES 2>&1 | grep -v "which isn't installed." || true
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# remove the development features script
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[ -e "$DEV_FEATURES_SCRIPT" ] && rm -f "$DEV_FEATURES_SCRIPT"
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# maybe an authorized_keys file was created - but it is not dangerous,
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# as the openssh package was removed anyway
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[ -d /root/.ssh ] && rm -rf /root/.ssh
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return 0
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}
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################ main ####################
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ACTION=help
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[ $# -gt 0 ] && ACTION=$1
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case "$ACTION" in
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normal )
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configure_normal
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;;
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secure )
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configure_secure
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;;
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* )
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echo "Syntax: `basename $0` { normal | secure }"
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echo
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;;
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esac
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