#!/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_signatures - 06/14/93
#
# 08/14/2003 jfs Added OUTPUTMETHOD and SNEFRU to dependancies
# 04/28/93 dls  Added '-L' option to 'ls' so that we get the permissions
#               from the file instead of the symbolic link.
#
#-----------------------------------------------------------------------------
#
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 AWK CAT FMT GREP LS RM SED SORT SNEFRU OUTPUTMETHOD || exit 1
  haveallfiles BASEDIR WORKDIR SIGNATURE_FILE || exit 1
  
  echo "--CONFIG-- [init003c] $0: Configuration ok..."
  exit 0
}

#------------------------------------------------------------------------

echo
echo "# Performing signature check of system binaries..."

haveallcmds AWK CAT FMT GREP LS RM SED SORT SNEFRU OUTPUTMETHOD || exit 1
haveallfiles BASEDIR SIGNATURE_FILE WORKDIR || exit 1

$SED -e '/^#/d' -e '/^[ 	]*$/d' $SIGNATURE_FILE |
$AWK '{print $3}' |
$SORT -u |
while read file
do
  if [ -r $file ]; then
    $GREP -v '^#' $SIGNATURE_FILE |
    $GREP "[ 	]$file[ 	]" | {
      located=0
      versions=""
      while read flag msgid fl p1 p2 p3 p4 p5 p6 p7 p8 comment
      do
	loc_signature=
	case "$p1$p2$p3$p4$p5$p6$p7$p8" in
	  *[!0-9a-f]*) {
	    std_signature="$p1"
	    comment="$p2 $p3 $p4 $p5 $p6 $p7 $p8 $comment"
	    [ -n "$MD5" ] && loc_signature="`$MD5 < $file`"
	  }
	  ;;
	  *) {
	    std_signature=" $p1 $p2 $p3 $p4 $p5 $p6 $p7 $p8"
	    [ -n "$SNEFRU" ] && loc_signature="`$SNEFRU < $file`"
	  }
	  ;;
	esac

	[ -n "$loc_signature" ] && {
	  case $flag in
	    Y)
	    versions="$versions>>>>>> $comment
"
            [ "$loc_signature" = "$std_signature" ] && located=1;;
	    N)
	    [ "$loc_signature" = "$std_signature" ] && {
	      perm="`$LS $LSLINK -l $file | $AWK '{print $1}'`"
	      message ALERT $msgid "" "Binary $file ($perm) $comment."
	      located=1
	    }
	    ;;
	    O)
	    versions="$versions>>>>>> $comment
"
            perm="`$LS -l $file | $AWK '{print $1}'`"
            [ "$loc_signature" = "$std_signature" ] && {
	      message WARN $msgid "" "$file ($perm) is from $comment"
	      located=1
	    }
	    ;;
	  esac
	}
        [ "$located" = 1 ] && break
      done

      [ "$located" = "0" -a -n "$versions" ] && {
	perm="`$LS -l $file | $AWK '{print $1}'`"
	message WARN sig004w "$versions" "None of the following versions of $file ($perm) matched the $file on this machine."
      }
    }
  elif [ -f $file ]; then
    message ERROR sig005e "" "Unable to read binary $file.  Can not perform signature check."
  fi
done |
$OUTPUTMETHOD

#
exit 0
