#!/bin/sh
#
#     tiger - A UN*X security checking system
#     Copyright (C) 1993 Douglas Lee Schales, David K. Hess, David R. Safford
#
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2, or (at your option)
#    any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#     Please see the file `COPYING' for the complete copyright notice.
#
# check_services - 04/16/2003
#
# Check which services are configured in the system (usually in 
# /etc/services) versus the ones that should be configured (in the 
# provided services file)
#
# check_services - 10/18/2003 - jfs - Avoid misreports for services which
#    are not defined in /etc/services but are generated by gen_services.
#    Patch submitted by Dale Martin.
# check_services - 08/14/2003 - jfs - Added OUTPUTMETHOD to dependancies also
#                               incorporated tara's 3.0.3 changes
# check_services - 08/09/2003 - jfs - Added RM to dependancies.
# check_services - 08/08/2003 - jfs
#    Created securely the $tmpservices file, otherwise, if the directory
#    $WORKDIR is not secure it could be exploited as a race condition.
# check_services - 04/23/2003 - jfs
#     Fixed requirements 
# check_services - 04/16/2003 - jfs
#     Separated check_services from check_inetd
#     Modified script so that it does not FAIL on services which are 
#     already duplicated in the OS service file.
# check_inetd - 05/27/2002 - jfs
#     Changed TigerInstallDir to .
# check_inetd - 12/13/01 - jfs
#     Fixes to avoid false positives 
# check_inetd - 04/20/99
#     Portions corrected y Advanced Research Corporation (R)
#     
#-----------------------------------------------------------------------------
#
TigerInstallDir="/usr/share/tiger"

#
# Set default base directory.
# Order or preference:
#      -B option
#      TIGERHOMEDIR environment variable
#      TigerInstallDir installed location
#
basedir=${TIGERHOMEDIR:=$TigerInstallDir}

for parm
do
   case $parm in
   -B) basedir=$2; break;;
   esac
done
#
# Verify that a config file exists there, and if it does
# source it.
#
[ ! -r $basedir/config ] && {
  echo "--ERROR-- [init002e] No 'config' file in \`$basedir'."
  exit 1
}
. $basedir/config

. $BASEDIR/initdefs
#
# If run in test mode (-t) this will verify that all required
# elements are set.
#
[ "$Tiger_TESTMODE" = 'Y' ] && {
  haveallcmds SED AWK CAT GEN_SERVICES_SETS GREP JOIN SORT RM OUTPUTMETHOD || exit 1
  haveallfiles BASEDIR WORKDIR SERVICESFILE || exit 1
  
  echo "--CONFIG-- [init003c] $0: Configuration ok..."
  exit 0
}

#------------------------------------------------------------------------
echo
echo "# Performing check of 'services' ..."


haveallcmds SED AWK CAT GEN_SERVICES_SETS GREP JOIN SORT RM OUTPUTMETHOD || exit 1
haveallfiles BASEDIR WORKDIR SERVICESFILE || exit 1

saveifs=$IFS

tmpservices=$WORKDIR/sec.$$ts
safe_temp "$tmpservices"
trap 'delete $tmpservices ; exit 1' 1 2 3 15

checkservices ()
{
  services="$1"

  # Check that these services have the correct port assigned.
  while read currservice currport
  do
    [ ! -z "$currport" ] && {
    matches="`$AWK '{ print $2 \" \" $1}' $services | $GREP \"^$currport \" | $AWK '{ print $1 }'`"
    IFS=/
    set $currport
    IFS=$saveifs
    currportnum=$1
    serviceok="N"
# Note: The message is not sent and the serviceok variable is used
# so that problems with repeated entries do not lead to false positives
# (jfs, debian bug #123730)
    for port in $matches
    do
      IFS=/
      set $port
      IFS=$saveifs
      if [ "$1" = "$currportnum" ]; then
	      serviceok="Y"
      fi
    done
    # added to handle when /etc/services has less services than the 
    # reference file
    if [ "$matches" = "" ]; then serviceok="Y"; fi
    if [ "$serviceok" = "N" ]; then
	message FAIL inet002f "" "Service $currservice is assigned to port $port which should be $currport."
    fi
    }
  done < $SERVICESFILE

  # Check that these services are not set for any other services.
  while read currservice currport
  do 
    matches=`$GREP " $currport$" $services | $AWK '{ print $1 }'`
    for service in $matches
    do
      if [ $service != $currservice ]; then
        origmatch=`$GREP " $currport$" $SERVICESFILE | $AWK '{ print $1 }' | $GREP $service`
	[ -z "$origmatch" ] && 
		message WARN inet003w "" "The port for service $currservice is also assigned to service $service."
      fi
    done
  done < $SERVICESFILE

  # Print out any other entries that have been added
  $AWK '{ print $1 " " $2 }' $services |
  $GREP -v '^#' | $GREP -v '^ $' | $SORT |
  while read currservice currport
  do
	matchescount=""
	matches=`$AWK '{ print $1 " " $2 }' $SERVICESFILE | $GREP " $currport$" | $AWK '{ print $1 }'`
	for service in $matches
	do
	if [ $service = $currservice ]; then
		matchescount="$matchescount."
	fi
  done
  if [ "x$matchescount" = "x" ]; then
    message INFO inet004i "" "$currservice is $currport (local addition)."
  fi
  done
}


realpath="$REALPATH -d"

[ ! -n "$REALPATH" -o ! $TESTEXEC "$REALPATH" ] && realpath="echo"

{
  haveallcmds GEN_SERVICES_SETS &&
  haveallfiles SERVICESFILE && {
    $GEN_SERVICES_SETS |
    while read services_set
    do
      echo "# Checking services from `$CAT $services_set.src`."

      $AWK '!/^#/ { print $1, $2 }' $services_set |
      $SED -e '/^$/d' |
      $SORT -u > $tmpservices

      checkservices $tmpservices

      delete $services_set $services_set.src $tmpservices
    done
  }


} |
$OUTPUTMETHOD

exit 0
