#
#     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 1, 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.
#
# initdefs - 06/14/93
#
# initdefs - 01/10/2005 - cslater - Modified ignore function so that
#                     filtering can also be done on msgid and level
# initdefs - 08/01/2004 - jfs - Allow removal from LOGDIR so that tiger -e
#                     works as expected
# initdefs - 10/15/2003 - jfs - Quoted $__File in deleted() in order
#                     for the check_rootkit check to work properly.
#                     (Debian bug #215882)
# initdefs - 10/10/2003 - jfs - Improved check so that it will not 
#                     remove files created by a different user and
#                     warn if files to be deleted do not exist 
#                     (currently disabled since some checks remove things
#                     twice)
# initdefs - 09/20/2003 - jfs - Fixed have_allvars since it was not working
# initdefs - 09/19/2003 - jfs - Different error messages in have_allvars.
#            Applied patch from Ryan Bradetich to fix UID -> UUID
# initdefs - 08/13/2003 - jfs - Run_script now returns error number
# initdefs - 08/09/2003 - jfs - Delete now checks if RM exists
# initdefs - 08/08/2003 - jfs - Added safe_temp and run_script functions
#
#-----------------------------------------------------------------------------
#
# Routines for verifying environment
#
# haveallcmds - verify command variables
# haveallfiles - verify files
# haveallvars - verify variables
#
haveallcmds()
# Note:
# In some cases haveallcmds might fail if the program is not installed
# (such as when looking for SNEFRU) it might be necessary to have config
# files use ../../bin as part of the SRCH for this to work.
{
  __retval=0

  for __file
  do
    eval __cmdstr=\$$__file
    set X $__cmdstr
    __cmd=$2
    if [ ! -n "$__cmdstr" ]; then
      echo "--ERROR-- [init001e] Don't have required command $__file."
      __retval=1
    elif [ ! -f "$__cmd" ]; then
      echo "--ERROR-- [init004e] \`$__cmd' is not executable (command $__file)."
      __retval=1
    fi
  done
  return $__retval
}

haveallfiles()
{
  __retval=0

  for __var
  do
    eval __file=\$$__var
    if [ ! -n "$__file" ]; then
      echo "--ERROR-- [init005e] Don't have required file $__var."
      __retval=1
    elif [ ! -f "$__file" -a ! -d "$__file" ]; then
      echo "--ERROR-- [init006e] \`$__file' does not exist (file $__var)."
      __retval=1
    fi
  done

  return $__retval
}

haveallvars()
{
  __retval=0

  for __var
  do
    eval __val=\$$__var
    # Note: Probably checking if __val = "$" would be sufficient here
    # too.
    eval "echo \${$__var?error}" >/dev/null 2>&1
    [ $? -ne 0 ] && {
      echo "--ERROR-- [init007e] Don't have required variable $__var."
      __retval=1
    }
    if [ $__retval -eq 0 -a ! -n "$__val" ]
    then
      echo "--ERROR-- [init007e] Required variable $__var is empty."
      __retval=1
    fi
  done

  return $__retval
}

#
# Safe delete... will only delete files in $WORKDIR
#
delete()
{
  goahead=1
  if [ -z "$RM" ] ; then
  	echo "--ERROR-- [init001e] The variable RM is not defined. Aborting."
	exit 1
  fi
  for __file
  do
    if [ -n "$LS" ]
    then 
    	if [ -z "`$LS \"$__file\" 2>/dev/null`" ] 
	then
#       		echo "--ERROR-- [post001e] File \`$__file' will not be removed since it does not exist"
		goahead=0
	fi
    	if [ $goahead -eq 1 -a  -n "$AWK" -a -n "$UUID" ]
	then
	    	if [ "$UUID" != "`$LS -nl \"$__file\" | $AWK '{print $3}'`" ] 
		then
       			echo "--ERROR-- [post001e] File \`$__file' will not be removed since it has not been created by the current user (symlink attack?)."
			goahead=0
		fi
	fi
    fi
    [ $goahead -eq 1 ]  &&  {
    eval "case \"\$__file\" in
      $WORKDIR*) $RM -f \"\$__file\";;
      $LOGDIR*)  $RM -f \"\$__file\";;
      *) echo \"--ERROR-- [post001e] File \\\`\$__file' not removed.\";;
    esac"
    }
  done 2>/dev/null
}
#
# Determine if a message must be ignored. In order for this
# it uses the IGNORE_FILE defined 
# (in a similar way as logcheck does, using $EGREP -v -f )
#
ignore_message()
{
	__retval=1
  	__mesgcheck="$1"  
	[ -n "$IGNORE_FILE" ] && [ -f $IGNORE_FILE ] &&  \
	[ -z "`echo \"$__mesgcheck\" | $EGREP -v -f $IGNORE_FILE`" ] && __retval=0
	return $__retval
}
#
# Format a message...
#
message()
{
  _level="$1"
  _msgid="$2"
  _trail="$3"
  _mesg="$4"  
  __len=${Tiger_Output_Width:=79}

  # If the message should be ignore it is removed
  ignore_message "$_level $_msgid $_mesg" && return 

  [ "$HTML" = "N" ] && {

  [ "$_level" = "INFO" -a "x$Tiger_Show_INFO_Msgs" = 'xN' ] && return

  {
    echo "$_mesg"
    [ -n "$_trail" ] && echo "$_trail"
  } |
  $AWK '
  BEGIN {
    printf("--%s-- [%s] ", "'"$_level"'", "'"$_msgid"'");
    vl = length("'"$_level"'") + 5;
    spaces="";
    for(i=0;i<vl;i++)
       spaces=spaces " ";
    ll = vl + length("'"$_msgid"'") + 3;
  }
  {
    if(ll==0){
      printf("%s", spaces);
      ll=vl;
    }
    for(i=1;i<=NF;i++){
      wl = length($i)+1;
      if('$__len' != 0 && (wl + ll) > '$__len'){
        printf("\n%s", spaces);
        ll = vl;
      }
      printf("%s ", $i);
      ll += wl;
    }
    printf("\n");
    ll=0;
  }
  '
}
 [ "$HTML" = "Y" ] && {
 [ "$_level" = "INFO" -a "x$Tiger_Show_INFO_Msgs" = 'xN' ] && return
  {
    echo "$_mesg"
    [ -n "$_trail" ] && echo "$_trail"
  } |
  $AWK '
  BEGIN {
      printf("</PRE><LI><B><I>%s</I></B> <A HREF=\"#%s\">[%s]</A>", "'"$_level"'", "'"$_msgid"'", "'"$_msgid"'");
    vl = length("'"$_level"'") + 5;
    spaces="";
    for(i=0;i<vl;i++)
       spaces=spaces " ";
    ll = vl + length("'"$_msgid"'") + 3;
  }
  {
    if(ll==0){
      printf("%s", spaces);
      ll=vl;
    }
    for(i=1;i<=NF;i++){
      wl = length($i)+1;
      if('$__len' != 0 && (wl + ll) > '$__len'){
        printf("\n%s", spaces);
        ll = vl;
      }
      printf("%s ", $i);
      ll += wl;
    }
    printf("<PRE>\n");
    ll=0;
  }
 '
}
}
#
#  Output messages about a file... reads the output of lgetpermit()
#
pathmsg()
{
  __omsgid="$1"
  __amsgid="$2"
  __path="$3"
  __owner="$4"
  __msgtxt="$5"
  __trailer="$6"

  __dir=0
  [ -d "$__path" ] && __dir=1
  
  __exec=0
  [ -f "$__path" ] && {	
    set X `getpermit "$__path"`
    shift 4

    [ "$3$6$9" != '000' ] && __exec=1
  }
  
  while read __comp __rowner __group ur uw ux gr gw gx or ow ox suid sgid stk
  do
    __omsg=''
    [ "$__owner" != '.' ] && {
      case "$__owner" in
	root) {
	  [ "$__owner" != "$__rowner" ] && {
	    __omsg="not owned by $__owner (owned by $__rowner)."
	    __olvl='WARN'
	    [ $__dir -eq 1 -o $__exec -eq 0 ] && __olvl='INFO'
	  }
	}
        ;;
	*) {
	  [ "$__owner" != "$__rowner" ] && {
	    __omsg="not owned by $__owner (owned by $__rowner)."
	    __olvl='WARN'
	    case "$__rowner" in
	      root|bin) __omsg='';;
	    esac
	  }
	}
        ;;
      esac
    }

    __file="\`$__path'"
    [ "$__path" != "$__comp" ] && {
      __file="\`$__path' which contains \`$__comp'"
    }
    
    case "$gw$ow" in
      00) __access='';;
      01) {
	__access='world'
	__alvl='FAIL'
	[ $__dir -eq 1 -o $__exec -eq 0 ] && __alvl='INFO'
	__newmode='o-w'
      }
      ;;
      10) {
	__access="group \`$__group'"
	__alvl='WARN'
	[ $__dir -eq 1 -o $__exec -eq 0 ] && {
	  case "$__owner" in
	    root) __alvl='INFO';;
	    *) __access='';;
	  esac
	}
	__newmode='g-w'
      }
      ;;
      11) {
	__access="group \`$__group' and world"
	__alvl='FAIL'
	[ $__dir -eq 1 -o $__exec -eq 0 ] && __alvl='INFO'
	__newmode='go-w'
      }
      ;;
      *) __access='';;
    esac
    
    [ -n "$__omsg" ] && {
      message "$__olvl" "$__omsgid" "$__trailer" "$__msgtxt $__file which is $__omsg"
      echo
      changelog "$__olvl : chown : $__owner : $__comp"
    }
    
    [ -n "$__access" ] && {
      message "$__alvl" "$__amsgid" "$__trailer" "$__msgtxt $__file which is $__access writable."
      echo
      changelog "$__alvl : chmod : $__newmode : $__comp"
    }
  done
}
#
# Generate 0's and 1's to indicate the user, group and other read, write,
# and execute permissions on a given file.
#
__getpermit()
{
  (
    if [ -n "$1" ]; then
      for file
      do
	$LS $LSLINK $LSGROUP -ld "$file" 2> /dev/null
      done
    else
      while read file
      do
	$LS $LSLINK $LSGROUP -ld "$file" 2> /dev/null
      done
    fi
  ) |
   $AWK '
    {
      printf("%s %s %s ", $NF, $3, $4);
      for(i=2;i<11;i++){
        c = substr($1, i, 1);
        if(c != "-" && c != "S" && c != "T"){
	   printf("1 ");
	}
        else {
	   printf("0 ");
        }
      }
      if(substr($1, 4, 1) == "s" || substr($1, 4, 1) == "S")
        printf("1 ");
      else
        printf("0 ");
      if(substr($1, 7, 1) == "s" || substr($1, 4, 1) == "S")
        printf("1 ");
      else
        printf("0 ");
      if(substr($1, 10, 1) == "t" || substr($1, 10, 1) == "T")
        printf("1 ");
      else
        printf("0 ");
      printf("\n");
   }'
}

getpermit()
{
  gp="$GETPERMIT"
  [ ! -n "$gp" ] && gp="__getpermit"
  if [ -n "$1" ]; then
    $gp "$1" 2>/dev/null
  else
    $gp 2>/dev/null
  fi
}

#
# Generate output lines of the form:
#
# pathname owner group ur uw ux gr gw gx or ow ox sticky suid sgid
#
# for every component of a filename.  If 'realpath' is "active",
# then symbolic links will be resolved and all components of the
# target will also be included in the output.
#
#---
# This definition should be overridden in the scripts including
# this file.  This is just for safety.
[ ! -n "$realpath" ] && realpath=echo
#
lgetpermit()
{
  _file="$1"
  _saveifs=$IFS
  __decomp="`$realpath \"$_file\"`"

  for __acomp in $__decomp
  do
    if [ "$__acomp" != '/' ]; then
      IFS=/
      set $__acomp
      IFS=$_saveifs
      _path=
    else
      _path=/
      set ""
    fi

    for _comp
    do
      [ -n "$_comp" ] && {
	_path="$_path/$_comp"
	echo "$_path"
      }
    done
  done |
  getpermit
}
#
# Write entry to change log
#
changelog()
{
  _msgtxt="$*"
  [ -n "$TigerChangeLog" ] && echo "$_msgtxt" >> $TigerChangeLog
}

#
# Generic cleanup routine.
# It will clean all the files available in the TigerCleanup variable
# scripts can either use this or define their own cleanup routine.
#
cleanup()
{
  [ "$_TIGER_RUN" != 'Y' -a -n "$TigerCleanup" ] && {
    delete $TigerCleanup
  }
}

#
# Given a temporary file determines if it exists
# if it does bails out since it shouldn't be there
safe_temp()
{
  for __tmpfile
  do
    if [ -f "$__tmpfile" ] ; then
        echo  "--ERROR-- [init009e] Tempfile \`$__tmpfile' exists."
        exit 1
    else
        >$__tmpfile
    fi
  done
}
#
# Run_script() function
# This function will run a script first looking for it in the most
# specific directories (those belonging to a given operating system
# release, revision and architecture) and to the most generic
# (the 'default' system and the scripts directory) afterwards.
# It will also check that the script is owned by the same user running
# the program and wether or not it is executable.
#
run_script()
{
  __script_run=""
  __error=0
  for __script
  do
	for dir in $BASEDIR/systems/default $SCRIPTDIR 
        do
	  if [ -f "$dir/$__script" ] ; then
            __script_run="$dir/$__script"
          fi
        done
	for dir in $OS $OS/$REL $OS/$REL/$REV $OS/$REL/$REV/$ARCH 
	do
	  if [ -f "$BASEDIR/systems/$dir/$__script" ] ; then
            __script_run="$BASEDIR/systems/$dir/$__script"
          fi
	done
#	echo "Script is $__script_run"
	if [ "$__script_run" != "" ] ; then
            __script_owner=`$LS -nl $__script_run | $AWK '{ print $3; }'`
            if [ $TESTEXEC $__script_run ]; then
	            if [ $__script_owner -eq $UUID ]; then
			$__script_run
		    else
			echo "--ERROR-- [misc024e] The $__script_run script will not be run since it is owned by a user ($__script_owner) different than the one running Tiger ($UUID)"
  			__error=1
		    fi
	    else
          	echo "--ERROR-- [misc025e] The $__script_run will not be run since it is not executable"
                __error=1
            fi
        else
          echo "--ERROR-- [misc005e] Can't find '$script'..."
          __error=1
        fi
  done
  return $__error
}


trap cleanup 0
