#!/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_sendmail - 06/14/93
#
# 05/18/2002 jfs Added check on banner (based on Titan's modules/smtpbanner.sh)
# 05/01/2003 jfs Added notes on behaviour, this check will only run if 
#                SENDMAILCF exists (after all, it's a sendmail-only check).
#                Fixed dependancies.
# 11/18/2003 jfs Fixed sintax problem which AIX choked on.
#                Noticed by Dale Martin.
#
#-----------------------------------------------------------------------------
#
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 SENDMAILS AWK LS SED STRINGS || exit 1
  haveallfiles SENDMAILCF BASEDIR WORKDIR || exit 1
  haveallvars TESTLINK HOSTNAME || exit 1
  
  echo "--CONFIG-- [init003c] $0: Configuration ok..."
  exit 0
}

#------------------------------------------------------------------------
echo
echo "# Checking sendmail..."

haveallcmds STRINGS GREP SED AWK SORT LS || exit 1
haveallfiles SENDMAILCF BASEDIR WORKDIR || exit 1

check_date()
{
  mailer="$1"
  # TODO: Doing 'strings' on the mailer will not work as advertised
  # and might return false positives/negatives. Also, many mailers
  # might provide a /usr/sbin/sendmail which contains that string
  # (exim, for example, does).

  if [ -r "$mailer" ]; then
    $STRINGS $mailer |
    $GREP '[0-9][0-9]/[0-9][0-9]/[0-9][0-9]' |
    $SED -e 's%^.* *\([0-9][0-9]*/[0-9][0-9]*/[0-9][0-9]*\).*$%\1%' |
    $AWK -F/ '{
      month=$1;
      day=$2;
      year=$3;
      if(month > 12){
      year=$1;
      month=$2;
      day=$3;
    }
    if(year<100)
    year += 1900;
    if(year<10)
    year += 2000;
    printf("%04d %02d %02d\n", year, month, day);
    }' |
    $SORT -r |
    $SED -e 1q | {
      read year month day
      if [ ! -z $year ]
      then 
      [ "$year" -lt 1993 -o \( "$year" -eq 1993 -a "$month" -lt 10 \) ] && {
	message WARN misc010w "" "$mailer appears to be older than November 1993 (apparent date $month/$day/$year), and may contain a security vulnerability."
      }
      fi
    }
  else
    message ERROR misc012e "" "Can not read $mailer.  Test skipped."
  fi
}

{
if [ -r "$SENDMAILCF" ]; then
  $GREP '^Mprog' $SENDMAILCF |
  $SED -e 's/^.*P=\([^, ]*\).*$/\1/'
else
  echo "/bin/sh"
fi
} |
{
  read progmailer

  usingsmrsh=0
  case "$progmailer" in
    */smrsh) usingsmrsh=1;;
  esac

  if [ "$usingsmrsh" = 0 ]; then
    for mailer in $SENDMAILS
    do
      [ -f "$mailer" ] && check_date "$mailer"
    done
  else
    $STRINGS $progmailer |
    $GREP '/[-a-zA-Z0-9_.][-a-zA-Z0-9_./]*' |
    $GREP -v '/.*:/.*' |
    $SED -e 's/[^-a-zA-Z0-9_./]/ /g' |   
    $AWK '{
      for(i=1;i<=NF;i++)
      if(substr($i,1,1) == "/")
      print $i;
    }' |
    $GREP '^/[-/a-zA-Z0-9_.]*$' |
    $GREP -v /bin/sh |
    while read path
    do
      [ -d "$path" ] && {
	$LS "$path" |
	while read file
	do
	  case "$file" in
	    sh|csh|perl|uudecode|sed|grep|awk|cat|ksh|bash|tcsh) {
	      message WARN misc011w "" "Executable \`$file' in 'smrsh' directory \`$path' may create a vulnerability"
	      }
	    ;;
	  esac
	done
      }
    done
  fi	      
}

if [ -r "$SENDMAILCF" ]; then
	version="`$GREP \"^O\ SmtpGreetingMessage=\$j\ Sendmail\ \$v\/\$Z\;\ \$b\" $SENDMAILCF`"
	[ -n "$version" ] &&
	      message WARN netw019w "" "Sendmail avertises its version in $SENDMAILCF, current line: $version"

fi

exit 0
