debian/postinst

   1 #!/bin/sh
   2
   3 set -e
   4
   5 [ "$DEBIAN_SCRIPT_DEBUG" ] && set -vx
   6
   7 case "$1" in
   8         configure)
   9         # continue below
  10         ;;
  11
  12         abort-upgrade|abort-remove|abort-deconfigure)
  13         exit 0
  14         ;;
  15
  16         *)
  17         echo "postinst called with unknown argument \`$1'" >&2
  18         exit 0
  19         ;;
  20 esac
  21
  22
  23 # Load debconf
  24 . /usr/share/debconf/confmodule
  25
  26 # Include CARNet functions
  27 . /usr/share/carnet-tools/functions.sh
  28
  29 PKG="mod-security-cn"
  30 A2DIR="/etc/apache2"
  31 CONF="$A2DIR/apache2.conf"
  32 CONFDIR="$A2DIR/conf.d"
  33 A2MODEDIR="$A2DIR/mods-enabled"
  34 MODSECDIR="$A2DIR/mod-security"
  35 MODSECCONF="$MODSECDIR/mod-security-cn.conf"
  36 MODSECRBL="$MODSECDIR/rbl_lookup.conf"
  37 MODSECLNK="$CONFDIR/$(basename $MODSECCONF)"
  38 MODSECTPL="/usr/share/mod-security-cn"
  39
  40 temp_files=
  41 need_restart=0
  42
  43
  44 # cleanup()
  45 #
  46 #   Cleanup all temp files or directories.
  47 #
  48 cleanup () {
  49
  50         local item
  51
  52         if [ -n "$temp_files" ]; then
  53             for item in $temp_files; do
  54                 if [ -e "$item" ]; then
  55                     rm -rf $item
  56                 fi
  57             done
  58         fi
  59 }
  60
  61 # chk_conf_tag ()
  62 #
  63 #   Check if configuration file has CARNet package info lines.
  64 #   return:  $RET => 0 - tagged
  65 #                    1 - file does not exists
  66 #                    2 - file exists, but it is not tagged
  67 #
  68 chk_conf_tag () {
  69
  70         local conf_file
  71         conf_file="$1"
  72         RET=1
  73
  74         if [ -f "$conf_file" ]; then
  75             if egrep -q "^## Begin - Generated by CARNet package mod-security-cn$" "$conf_file"; then
  76                 RET=0
  77             else
  78                 RET=2
  79             fi
  80         fi
  81 }
  82
  83
  84 # Set trap for deleting all temp files.
  85 #
  86 trap cleanup 0 1 2 15
  87
  88
  89 # Enable ModSecurity and unique_id Apache2 modules.
  90 #
  91 if [ -e "$CONF" ]; then
  92
  93         # Enable mod-security.load
  94         if [ ! -e "$A2MODEDIR/mod-security.load" ]; then
  95             cp_echo "CN: Enabling ModSecurity module for Apache2 web server."
  96             a2enmod mod-security >/dev/null || true
  97             need_restart=1
  98         fi
  99
 100         # Enable unique_id.load
 101         if [ ! -e "$A2MODEDIR/unique_id.load" ]; then
 102             cp_echo "CN: Enabling unique_id module for Apache2 web server."
 103             a2enmod unique_id >/dev/null || true
 104             need_restart=1
 105         fi
 106 fi
 107
 108
 109 # Generate ModSecurity configuration files and activate RBL lookup
 110 # for ModSecurity if needed.
 111 #
 112 chk_conf_tag "$MODSECCONF"
 113 if [ $RET -eq 0 ] || [ $RET -eq 1 ]; then
 114
 115         # Create /etc/apache2/conf.d/ directory if missing.
 116         if [ ! -d "$CONFDIR" ]; then
 117             cp_echo "CN: Creating configuration directory $CONFDIR/"
 118             mkdir -p $CONFDIR/
 119         fi
 120
 121         # Create /etc/apache2/mod-security/ directory if missing.
 122         if [ ! -d "$MODSECDIR" ]; then
 123             cp_echo "CN: Creating ModSecurity configuration directory $MODSECDIR/"
 124             mkdir -p $MODSECDIR/
 125         fi
 126
 127         out=$(mktemp $MODSECCONF.XXXXXX)
 128         temp_files="${temp_files} ${out}"
 129
 130         db_get mod-security-cn/rbl || true
 131         if [ "$RET" = "true" ]; then
 132
 133             # Add RBL configuration.
 134             chk_conf_tag "$MODSECRBL"
 135             if [ $RET -eq 0 ] || [ $RET -eq 1 ]; then
 136
 137                 if [ $RET -eq 1 ]; then
 138                     cp_echo "CN: Creating configuration file $MODSECRBL"
 139                     cp "$MODSECTPL/$(basename $MODSECRBL)" "$MODSECRBL"
 140                     need_restart=1
 141                 else
 142                     if ! cmp -s "$MODSECRBL" "$MODSECTPL/$(basename $MODSECRBL)"; then
 143                         cp_echo "CN: Updating configuration file $MODSECRBL"
 144                         cp "$MODSECTPL/$(basename $MODSECRBL)" "$MODSECRBL"
 145                         need_restart=1
 146                     fi
 147                 fi
 148             fi
 149
 150             sed "s,#RBLLOOKUP#,Include $MODSECRBL,g" \
 151                 "$MODSECTPL/$(basename $MODSECCONF)" > "$out"
 152
 153             if [ -e "$MODSECCONF" ]; then
 154                 if ! cmp -s "$MODSECCONF" "$out"; then
 155                     cp_echo "CN: Updating configuration file $MODSECCONF"
 156                     mv -f "$out" "$MODSECCONF"
 157                     cp_echo "CN: Enabled ModSecurity RBL lookup."
 158                     need_restart=1
 159                 fi
 160             else
 161                 cp_echo "CN: Creating configuration file $MODSECCONF"
 162                 mv "$out" "$MODSECCONF"
 163                 cp_echo "CN: Enabled ModSecurity RBL lookup."
 164                 need_restart=1
 165             fi
 166         else
 167
 168             # Remove RBL configuration.
 169             sed "s,#RBLLOOKUP#,# DISABLED,g" \
 170                 "$MODSECTPL/$(basename $MODSECCONF)" > "$out"
 171
 172             if [ -e "$MODSECCONF" ]; then
 173                 if ! cmp -s "$MODSECCONF" "$out"; then
 174                     cp_echo "CN: Updating configuration file $MODSECCONF"
 175                     mv -f "$out" "$MODSECCONF"
 176                     cp_echo "CN: Disabled ModSecurity RBL lookup."
 177                     need_restart=1
 178                 fi
 179             else
 180                 cp_echo "CN: Creating configuration file $MODSECCONF"
 181                 mv "$out" "$MODSECCONF"
 182                 cp_echo "CN: Disabled ModSecurity RBL lookup."
 183                 need_restart=1
 184             fi
 185
 186             chk_conf_tag "$MODSECRBL"
 187             if [ $RET -eq 0 ]; then
 188                 cp_echo "CN: Removing configuration file $MODSECRBL"
 189                 rm -f "$MODSECRBL"
 190                 need_restart=1
 191             fi
 192         fi
 193
 194         if [ -f "$out" ]; then rm -f $out; fi
 195
 196         # Enable ModSecurity configuration.
 197         if [ ! -e "$MODSECLNK" ]; then
 198             cp_echo "CN: Enabling ModSecurity configuration."
 199             ln -fs "$MODSECCONF" "$MODSECLNK"
 200             need_restart=1
 201         fi
 202 fi
 203
 204 db_stop || true
 205
 206
 207 # Restart Apache2 web server if needed.
 208 #
 209 if [ $need_restart -eq 1 ]; then
 210
 211         # Check Apache2 web server configuration.
 212         if /usr/sbin/apache2ctl configtest 2>/dev/null; then
 213
 214             # Restart Apache2 web server.
 215             if [ -x "/etc/init.d/apache2" ]; then
 216                 if [ -x "`which invoke-rc.d 2>/dev/null`" ]; then
 217                     invoke-rc.d apache2 restart || true
 218                 else
 219                     /etc/init.d/apache2 restart || true
 220                 fi
 221             fi
 222         else
 223
 224             # Something is broken.
 225             cp_echo "CN: Your Apache2 configuration is broken."
 226             cp_echo "CN: Please, check the service after the installation finishes!"
 227         fi
 228 fi
 229
 230
 231 # Mail root
 232 #
 233 cp_mail "$PKG"
 234
 235 exit 0