#!/bin/sh
# postinst script for spamassassin-cn
#
# see: dh_installdeb(1)

set -e

# summary of how this script can be called:
#        * <postinst> `configure' <most-recently-configured-version>
#        * <old-postinst> `abort-upgrade' <new version>
#        * <conflictor's-postinst> `abort-remove' `in-favour' <package>
#          <new-version>
#        * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
#          <failed-install-package> <version> `removing'
#          <conflicting-package> <version>
# for details, see http://www.debian.org/doc/debian-policy/ or
# the debian-policy package
#

case "$1" in
    configure|reconfigure)
      # continue below
    ;;

    *)
        exit 0
    ;;
esac

# import CN-functions
. /usr/share/carnet-tools/functions.sh

################################################################################

# starting up backup
echo -n "CN: Backed up to /var/backups:"

# backup lilo.conf
if [ -e /etc/lilo.conf ]; then
  cp_backup_conffile /etc/lilo.conf
  echo -n " lilo.conf"
fi

# backup old kernel params
if [ -e /etc/sysctl.conf ]; then
  cp_backup_conffile /etc/sysctl.conf
  echo -n " sysctl.conf"
fi

# backup old kernel params
if [ -e /etc/kernel-img.conf ]; then
  cp_backup_conffile /etc/kernel-img.conf
  echo -n " kernel-img.conf"
fi

# finished
echo "."

################################################################################

# intro msg
echo -n "CN: Configuring system (this will take a while):"

# generate kernel-img.conf
if [ ! -e /etc/kernel-img.conf ]; then
    touch /etc/kernel-img.conf
fi

# update postinst_hook for grub
if grep -q postinst_hook /etc/kernel-img.conf; then
    cp_check_and_sed '^postinst_hook' \
      's;^postinst_hook[[:blank:]]*=.*;postinst_hook = /usr/sbin/update-grub;g' \
          /etc/kernel-img.conf || true
else
    echo "postinst_hook = /usr/sbin/update-grub" >> /etc/kernel-img.conf
fi

# update postrm_hook for grub
if grep -q postrm_hook /etc/kernel-img.conf; then
    cp_check_and_sed '^postrm_hook' \
      's;^postrm_hook[[:blank:]]*=.*;postrm_hook = /usr/sbin/update-grub;g' \
          /etc/kernel-img.conf || true
else
    echo "postrm_hook = /usr/sbin/update-grub" >> /etc/kernel-img.conf
fi

# enable initrd
if grep -q do_initrd /etc/kernel-img.conf; then
    cp_check_and_sed '^do_initrd' \
      's/^do_initrd[[:blank:]]*=.*/do_initrd = yes/g' \
          /etc/kernel-img.conf || true
else
    echo "do_initrd = yes" >> /etc/kernel-img.conf
fi

echo -n " kernel-img.conf"

# generate initial grub loaders
if [ ! -d /boot/grub ]; then
    mkdir -p /boot/grub
    if [ -d /usr/lib/grub/i386-pc ]; then
        cp -a /usr/lib/grub/i386-pc/* /boot/grub
    fi
fi
echo -n " grub1"

# create/update grub configuration
if [ -e /boot/grub/menu.lst ]; then
    # is there uncompatibile grub conf present?
    if ! grep -q 'AUTOMAGIC KERNELS LIST' /boot/grub/menu.lst; then
        mv -f /boot/grub/menu.lst /boot/grub/menu.lst.old
    fi
fi
if [ ! -e /boot/grub/menu.lst ]; then
    yes | /usr/sbin/update-grub >/dev/null 2>&1 || true
else
    /usr/sbin/update-grub >/dev/null 2>&1 || true
fi
echo -n " grub2"

# workaround grsec
if [ -x /sbin/chpax ]; then
    if [ -x /usr/sbin/grub ]; then
        chpax -spmrx /usr/sbin/grub || true
    fi
    if [ -x /usr/sbin/grub-probe ]; then
        chpax -spmrx /usr/sbin/grub-probe || true
    fi
fi
echo -n " grub3"

# workaround execshield
SHIELD=$(sysctl -e -n kernel.exec-shield)
if [ ! -z "$SHIELD" ]; then
    sysctl -w -e kernel.exec-shield=0 >/dev/null 2>&1
fi

# install grub loader
if ! grub-install --no-floppy '(hd0)' >/dev/null 2>&1; then
    echo "."
    echo "CN: FATAL ERROR running grub-install!"
    echo "CN: Do not reboot your server and report this to OTRS immediately!"
    exit 1
fi
echo -n " grub4"

# restore execshield state
if [ ! -z "$SHIELD" ]; then
    sysctl -w -e "kernel.exec-shield=$SHIELD" >/dev/null 2>&1
fi

# disable lilo
if [ -e /etc/lilo.conf ]; then
    mv -f /etc/lilo.conf /etc/lilo.conf.old
fi
echo -n " lilo"

# mdadm
if [ -x /usr/share/mdadm/mkconf ]; then
    if [ ! -e /etc/mdadm/mdadm.conf ]; then
        touch /etc/mdadm/mdadm.conf
    fi

    /usr/share/mdadm/mkconf > /etc/mdadm/mdadm.conf.$$
    if ! cmp -s /etc/mdadm/mdadm.conf.$$ /etc/mdadm/mdadm.conf; then
        mv /etc/mdadm/mdadm.conf.$$ /etc/mdadm/mdadm.conf
    fi
    rm -f /etc/mdadm/mdadm.conf.$$ /etc/initramfs-tools/hooks/md \
        /var/lib/mdadm/CONF-UNCHECKED
    echo -n " mdadm"
fi

# update initramfs accordingly
update-initramfs -u -k all >/dev/null 2>&1 || true
echo -n " initramfs"

# finished
echo "."

################################################################################

# rest of configuration...
echo -n "CN: Modifying the neccessary system files:"

# remove group 99
if getent group proc >/dev/null 2>&1; then
    groupdel proc >/dev/null 2>&1
fi
echo -n " proc"

# remove oidentd from oident group
if getent group oident >/dev/null 2>&1; then
    # sarge default
    cp_check_and_sed '^OIDENT_GROUP[[:blank:]]*=[[:blank:]]*nogroup' \
      's/^OIDENT_GROUP[[:blank:]]*=[[:blank:]]*nogroup/OIDENT_GROUP=oident/g' \
          /etc/default/oidentd || true

    # old kernel-2.6-cn default
    cp_check_and_sed '^OIDENT_GROUP[[:blank:]]*=[[:blank:]]*proc' \
      's/^OIDENT_GROUP[[:blank:]]*=[[:blank:]]*proc/OIDENT_GROUP=oident/g' \
          /etc/default/oidentd || true

    echo -n " oidentd"
fi

# default kernel parameters
rm -f /etc/sysctl.conf.$$
cat > /etc/sysctl.conf.$$ <<EOF
kernel.exec-shield=3
kernel.maps_protect=1
net.core.rmem_default=1048576
net.core.wmem_default=1048576
net.ipv4.conf.all.accept_redirects=0
net.ipv4.conf.all.accept_source_route=0
net.ipv4.conf.all.log_martians=1
net.ipv4.conf.all.rp_filter=1
net.ipv4.conf.all.secure_redirects=1
net.ipv4.conf.all.send_redirects=0
net.ipv4.icmp_echo_ignore_broadcasts=1
net.ipv4.icmp_ignore_bogus_error_responses=1
net.ipv4.ip_forward=0
net.ipv4.ip_local_port_range=10000 65000
net.ipv4.tcp_congestion_control=cubic
net.ipv4.tcp_ecn=0
net.ipv4.tcp_max_syn_backlog=8192
net.ipv4.tcp_retries1=2
net.ipv4.tcp_rfc1337=1
net.ipv4.tcp_syncookies=1
vm.mmap_min_addr=65536
EOF

# old kernel params
if [ -e /etc/sysctl.conf ]; then
  #cat /etc/sysctl.conf >> /etc/sysctl.conf.$$
  #ignore some of 2.4 stuff
  egrep -v 'net\.core\.(r|w)mem_max|net\.ipv4\.tcp_(r|w)mem|vm\.bdflush|net\.ipv4\.ip_local_port_range|kernel\.rtsig-max|net\.ipv4\.tcp_syncookies' \
    /etc/sysctl.conf >> /etc/sysctl.conf.$$
fi

# add sysctl.conf Debian headers
rm -f /etc/sysctl.conf-head
cat > /etc/sysctl.conf-head <<EOF
#
# /etc/sysctl.conf - Configuration file for setting system variables
# See sysctl.conf (5) for information.
#
EOF

# merge old and new in one conf, primarily respecting old
script='
my %confhash = ();
my ($key, $value);
while (<>)
{
  chomp();
  if (/^\s*(\S+)\s*=\s*(.+)\s*$/o)
  {
    my ($key, $value) = ($1, $2);
    $key =~ s/\//./go;
    $confhash{$key} = $value;
  }
}
for (sort { $a cmp $b } keys %confhash)
{
  print $_, "=", $confhash{$_}, "\n";
}
'
rm -f /etc/sysctl.conf-new
perl -e "$script" < /etc/sysctl.conf.$$ > /etc/sysctl.conf-new
cat /etc/sysctl.conf-head /etc/sysctl.conf-new > /etc/sysctl.conf.$$
rm -f /etc/sysctl.conf-head /etc/sysctl.conf-new

# finished with merging, move into sysctl.conf
cp_mv /etc/sysctl.conf.$$ /etc/sysctl.conf
echo -n " sysctl.conf"

# finished with basic kernel-2.6-cn stuff
echo "."

################################################################################

# intro
echo -n "CN: Setting up PAM configurations:"

# update pam_limits accordingly
if [ -e /etc/security/limits.conf ]; then
  rm -f /etc/security/limits.conf.$$
  cp /etc/security/limits.conf /etc/security/limits.conf.$$
  cp-update kernel-2.6-cn /etc/security/limits.conf.$$ <<EOF
*               soft    core            0
*		hard	nofile		4096
*		soft	nofile		4096
EOF
  cp_mv /etc/security/limits.conf.$$ /etc/security/limits.conf
  echo -n " limits"
fi

# check pam.d/login
if [ -e /etc/pam.d/login ]; then
  cp_check_and_sed '^#.*session.+required.+pam_limits.so' \
    's/^#.*session.+required.+pam_limits.so/session required pam_limits.so/' \
    /etc/pam.d/login || true
  echo -n " login"
fi

# check pam.d/ssh
if [ -e /etc/pam.d/ssh ]; then
  cp_check_and_sed '^#.*session.+required.+pam_limits.so' \
    's/^#.*session.+required.+pam_limits.so/session required pam_limits.so/' \
    /etc/pam.d/ssh || true
  echo -n " ssh"
fi

# finished with PAM
echo "."

################################################################################

# remove obsolete links
rm -f /boot/vmlinuz /boot/vmlinuz.old /boot/vmlinuz.old2 \
  /boot/vmlinuz.plain /vmlinuz /vmlinuz.old /boot/vmlinuz.plain
echo "CN: Removed old symlinks in / and /boot."

################################################################################

# fix old kernel-2.4-cn postrm
if [ -e /var/lib/dpkg/info/kernel-2.4-cn.postrm ]; then
    echo "CN: Fixed old kernel-2.4-cn postrm."
    cat > /var/lib/dpkg/info/kernel-2.4-cn.postrm.$$ <<EOF
#!/bin/sh

set -e

# be sure, be safe
if [ "$1" != "remove" ]; then
  exit 0
fi

# import CN-functions
. /usr/share/carnet-tools/functions.sh

# remove us from limits.conf
cp-update -r kernel-2.4-cn /etc/security/limits.conf

# remove us from modules
cp-update -r kernel-2.4-cn /etc/modules
EOF
    if ! cmp -s /var/lib/dpkg/info/kernel-2.4-cn.postrm \
        /var/lib/dpkg/info/kernel-2.4-cn.postrm.$$; then
        mv /var/lib/dpkg/info/kernel-2.4-cn.postrm.$$ \
            /var/lib/dpkg/info/kernel-2.4-cn.postrm
        chmod +x /var/lib/dpkg/info/kernel-2.4-cn.postrm
    fi
    rm -f /var/lib/dpkg/info/kernel-2.4-cn.postrm.$$
fi

################################################################################

# fix old kernel-cn postrm
if [ -e /var/lib/dpkg/info/kernel-cn.postrm ]; then
    echo "CN: Fixed old kernel-cn postrm."
    cat > /var/lib/dpkg/info/kernel-cn.postrm.$$ <<EOF
#!/bin/sh

set -e

# be sure, be safe
if [ "$1" != "remove" ]; then
  exit 0
fi

# import CN-functions
. /usr/share/carnet-tools/functions.sh

# remove us from limits.conf
cp-update -r kernel-cn /etc/security/limits.conf

# remove us from modules
cp-update -r kernel-cn /etc/modules
EOF
    if ! cmp -s /var/lib/dpkg/info/kernel-cn.postrm \
        /var/lib/dpkg/info/kernel-cn.postrm.$$; then
        mv /var/lib/dpkg/info/kernel-cn.postrm.$$ \
            /var/lib/dpkg/info/kernel-cn.postrm
        chmod +x /var/lib/dpkg/info/kernel-cn.postrm
    fi
    rm -f /var/lib/dpkg/info/kernel-cn.postrm.$$
fi

################################################################################

# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.

#DEBHELPER#

exit 0