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#!/bin/sh -
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#
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# $OpenBSD: security,v 1.17 1996/12/10 07:26:01 deraadt Exp $
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# from: @(#)security 8.1 (Berkeley) 6/9/93
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#
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PATH=/sbin:/usr/sbin:/bin:/usr/bin
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umask 077
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DIR=/tmp/_secure$$
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ERR=$DIR/_secure1
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TMP1=$DIR/_secure2
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TMP2=$DIR/_secure3
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TMP3=$DIR/_secure4
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LIST=$DIR/_secure5
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OUTPUT=$DIR/_secure6
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if ! mkdir $DIR ; then
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printf "tmp directory %s already exists, looks like:\n" $DIR
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ls -alF $DIR
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exit 1
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fi
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trap 'rm -rf $DIR' 0 1 15
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# Check the master password file syntax.
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MP=/etc/master.passwd
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awk -F: '{
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if ($0 ~ /^[ ]*$/) {
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printf("Line %d is a blank line.\n", NR);
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next;
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}
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if (NF != 10)
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printf("Line %d has the wrong number of fields.\n", NR);
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if ($1 ~ /^[+-]/)
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next;
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if ($1 == "")
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printf("Line %d has an empty login field.\n", NR);
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else if ($1 !~ /^[A-Za-z0-9][A-Za-z0-9_-]*$/)
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printf("Login %s has non-alphanumeric characters.\n", $1);
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if (length($1) > 8)
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printf("Login %s has more than 8 characters.\n", $1);
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if ($2 == "")
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printf("Login %s has no password.\n", $1);
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if ((length($2) != 13 && ($10 ~ /.*sh$/ || $10 == "")) && system("if grep -q \"^"$1" \" /etc/skeykeys || test -d "$9"/.ssh -a ! -O "$9"/.ssh ; then exit 1 ; fi ; for i in .rhosts .shosts .klogin ; do test -s "$9"/$i -a ! -O "$9"/$i && exit 1 ; done ; exit 0") != 0)
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printf("Login %s is off but still has a valid shell.\n", $1);
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if ($3 == 0 && $1 != "root")
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printf("Login %s has a user id of 0.\n", $1);
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if ($3 < 0)
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printf("Login %s has a negative user id.\n", $1);
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if ($4 < 0)
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printf("Login %s has a negative group id.\n", $1);
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}' < $MP > $OUTPUT
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if [ -s $OUTPUT ] ; then
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printf "\nChecking the $MP file:\n"
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cat $OUTPUT
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fi
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awk -F: '{ print $1 }' $MP | sort | uniq -d > $OUTPUT
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if [ -s $OUTPUT ] ; then
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printf "\n$MP has duplicate user names.\n"
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column $OUTPUT
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fi
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awk -F: '{ print $1 " " $3 }' $MP | sort -n +1 | tee $TMP1 |
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uniq -d -f 1 | awk '{ print $2 }' > $TMP2
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if [ -s $TMP2 ] ; then
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printf "\n$MP has duplicate user id's.\n"
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while read uid; do
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grep -w $uid $TMP1
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done < $TMP2 | column
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fi
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# Backup the master password file; a special case, the normal backup
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# mechanisms also print out file differences and we don't want to do
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# that because this file has encrypted passwords in it.
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if [ ! -d /var/backups ] ; then
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mkdir /var/backups
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chmod 755 /var/backups
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fi
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CUR=/var/backups/`basename $MP`.current
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BACK=/var/backups/`basename $MP`.backup
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if [ -s $CUR ] ; then
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if cmp -s $CUR $MP; then
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:
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else
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cp -p $CUR $BACK
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cp -p $MP $CUR
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chown root.wheel $CUR
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fi
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else
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cp -p $MP $CUR
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chown root.wheel $CUR
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fi
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# Check the group file syntax.
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GRP=/etc/group
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awk -F: '{
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if ($0 ~ /^[ ]*$/) {
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printf("Line %d is a blank line.\n", NR);
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next;
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}
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if ($1 ~ /^[+-].*$/)
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next;
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if (NF != 4)
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printf("Line %d has the wrong number of fields.\n", NR);
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if ($1 !~ /^[A-za-z0-9][A-za-z0-9_-]*$/)
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printf("Group %s has non-alphanumeric characters.\n", $1);
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if (length($1) > 8)
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printf("Group %s has more than 8 characters.\n", $1);
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if ($3 !~ /[0-9]*/)
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printf("Login %s has a negative group id.\n", $1);
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}' < $GRP > $OUTPUT
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if [ -s $OUTPUT ] ; then
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printf "\nChecking the $GRP file:\n"
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cat $OUTPUT
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fi
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awk -F: '{ print $1 }' $GRP | sort | uniq -d > $OUTPUT
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if [ -s $OUTPUT ] ; then
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printf "\n$GRP has duplicate group names.\n"
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column $OUTPUT
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fi
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# Check for root paths, umask values in startup files.
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# The check for the root paths is problematical -- it's likely to fail
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# in other environments. Once the shells have been modified to warn
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# of '.' in the path, the path tests should go away.
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> $OUTPUT
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rhome=/root
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umaskset=no
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list="/etc/csh.cshrc /etc/csh.login ${rhome}/.cshrc ${rhome}/.login"
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for i in $list ; do
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if [ -s $i ] ; then
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if egrep umask $i > /dev/null ; then
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umaskset=yes
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fi
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egrep umask $i |
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awk '$2 % 100 < 20 \
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{ print "Root umask is group writeable" }
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$2 % 10 < 2 \
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{ print "Root umask is other writeable" }' >> $OUTPUT
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/bin/csh -f -s << end-of-csh > /dev/null 2>&1
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unset path
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source $i
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/bin/ls -ldgT \$path > $TMP1
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end-of-csh
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awk '{
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if ($10 ~ /^\.$/) {
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print "The root path includes .";
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next;
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}
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}
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$1 ~ /^d....w/ \
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{ print "Root path directory " $10 " is group writeable." } \
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$1 ~ /^d.......w/ \
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{ print "Root path directory " $10 " is other writeable." }' \
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< $TMP1 >> $OUTPUT
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fi
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done
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if [ $umaskset = "no" -o -s $OUTPUT ] ; then
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printf "\nChecking root csh paths, umask values:\n$list\n"
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if [ -s $OUTPUT ] ; then
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cat $OUTPUT
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fi
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if [ $umaskset = "no" ] ; then
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printf "\nRoot csh startup files do not set the umask.\n"
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fi
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fi
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> $OUTPUT
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rhome=/root
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umaskset=no
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list="${rhome}/.profile"
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for i in $list; do
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if [ -s $i ] ; then
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if egrep umask $i > /dev/null ; then
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umaskset=yes
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fi
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egrep umask $i |
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awk '$2 % 100 < 20 \
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{ print "Root umask is group writeable" } \
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$2 % 10 < 2 \
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{ print "Root umask is other writeable" }' >> $OUTPUT
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/bin/sh << end-of-sh > /dev/null 2>&1
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PATH=
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. $i
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list=\`echo \$PATH | /usr/bin/sed -e 's/:/ /g'\`
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/bin/ls -ldgT \$list > $TMP1
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end-of-sh
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awk '{
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if ($10 ~ /^\.$/) {
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print "The root path includes .";
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next;
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}
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}
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$1 ~ /^d....w/ \
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{ print "Root path directory " $10 " is group writeable." } \
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$1 ~ /^d.......w/ \
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{ print "Root path directory " $10 " is other writeable." }' \
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< $TMP1 >> $OUTPUT
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fi
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done
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if [ $umaskset = "no" -o -s $OUTPUT ] ; then
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printf "\nChecking root sh paths, umask values:\n$list\n"
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if [ -s $OUTPUT ] ; then
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cat $OUTPUT
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fi
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if [ $umaskset = "no" ] ; then
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printf "\nRoot sh startup files do not set the umask.\n"
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fi
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fi
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# Root and uucp should both be in /etc/ftpusers.
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if egrep root /etc/ftpusers > /dev/null ; then
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:
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else
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printf "\nRoot not listed in /etc/ftpusers file.\n"
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fi
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if egrep uucp /etc/ftpusers > /dev/null ; then
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:
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else
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printf "\nUucp not listed in /etc/ftpusers file.\n"
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fi
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# Uudecode should not be in the /etc/aliases file.
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if egrep 'uudecode|decode' /etc/aliases; then
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printf "\nThere is an entry for uudecode in the /etc/aliases file.\n"
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fi
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# Files that should not have + signs.
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list="/etc/hosts.equiv /etc/shosts.equiv /etc/hosts.lpd"
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for f in $list ; do
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if [ -s $f ] ; then
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awk '{
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if ($0 ~ /^\+@.*$/)
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next;
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if ($0 ~ /^\+.*$/)
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printf("\nPlus sign in %s file.\n", FILENAME);
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}' $f
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fi
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done
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# Check for special users with .rhosts/.shosts files. Only root
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# should have .rhosts/.shosts files. Also, .rhosts/.shosts
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# files should not have plus signs.
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awk -F: '$1 != "root" && $1 !~ /^[+-]/ && \
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($3 < 100 || $1 == "ftp" || $1 == "uucp") \
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{ print $1 " " $6 }' /etc/passwd |
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while read uid homedir; do
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for j in .rhosts .shosts; do
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# Root owned .rhosts/.shosts files are ok.
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if [ -s ${homedir}/$j -a ! -O ${homedir}/$j ] ; then
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rhost=`ls -ldgT ${homedir}/$j`
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printf "$uid: $rhost\n"
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fi
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done
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done > $OUTPUT
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if [ -s $OUTPUT ] ; then
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printf "\nChecking for special users with .rhosts/.shosts files.\n"
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cat $OUTPUT
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fi
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awk -F: '/^[^+-]/ { print $1 " " $6 }' /etc/passwd | \
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while read uid homedir; do
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for j in .rhosts .shosts; do
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if [ -s ${homedir}/$j ] ; then
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awk '{
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if ($0 ~ /^+@.*$/ )
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next;
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if ($0 ~ /^\+[ ]*$/ )
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printf("%s has + sign in it.\n",
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FILENAME);
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}' ${homedir}/$j
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fi
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done
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done > $OUTPUT
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if [ -s $OUTPUT ] ; then
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printf "\nChecking .rhosts/.shosts files syntax.\n"
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cat $OUTPUT
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fi
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# Check home directories. Directories should not be owned by someone else
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# or writeable.
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awk -F: '/^[^+-]/ { print $1 " " $6 }' /etc/passwd | \
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while read uid homedir; do
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if [ -d ${homedir}/ ] ; then
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file=`ls -ldgT ${homedir}`
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printf "$uid $file\n"
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fi
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done |
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awk '$1 != $4 && $4 != "root" \
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{ print "user " $1 " home directory is owned by " $4 }
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$2 ~ /^-....w/ \
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{ print "user " $1 " home directory is group writeable" }
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$2 ~ /^-.......w/ \
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{ print "user " $1 " home directory is other writeable" }' > $OUTPUT
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if [ -s $OUTPUT ] ; then
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printf "\nChecking home directories.\n"
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cat $OUTPUT
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fi
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# Files that should not be owned by someone else or readable.
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list=".netrc .rhosts .shosts"
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awk -F: '/^[^+-]/ { print $1 " " $6 }' /etc/passwd | \
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while read uid homedir; do
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for f in $list ; do
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file=${homedir}/${f}
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if [ -f $file ] ; then
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printf "$uid $f `ls -ldgT $file`\n"
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fi
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done
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done |
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awk '$1 != $5 && $5 != "root" \
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{ print "user " $1 " " $2 " file is owned by " $5 }
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$3 ~ /^-...r/ \
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{ print "user " $1 " " $2 " file is group readable" }
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$3 ~ /^-......r/ \
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{ print "user " $1 " " $2 " file is other readable" }
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$3 ~ /^-....w/ \
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{ print "user " $1 " " $2 " file is group writeable" }
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$3 ~ /^-.......w/ \
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{ print "user " $1 " " $2 " file is other writeable" }' > $OUTPUT
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# Files that should not be owned by someone else or writeable.
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list=".bashrc .cshrc .emacs .exrc .forward .klogin .login .logout \
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.profile .tcshrc"
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awk -F: '/^[^+-]/ { print $1 " " $6 }' /etc/passwd | \
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while read uid homedir; do
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for f in $list ; do
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file=${homedir}/${f}
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if [ -f $file ] ; then
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printf "$uid $f `ls -ldgT $file`\n"
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fi
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done
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done |
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awk '$1 != $5 && $5 != "root" \
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{ print "user " $1 " " $2 " file is owned by " $5 }
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$3 ~ /^-....w/ \
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{ print "user " $1 " " $2 " file is group writeable" }
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$3 ~ /^-.......w/ \
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{ print "user " $1 " " $2 " file is other writeable" }' >> $OUTPUT
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if [ -s $OUTPUT ] ; then
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printf "\nChecking dot files.\n"
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cat $OUTPUT
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fi
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# Mailboxes should be owned by user and unreadable.
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ls -l /var/mail | sed 1d | \
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awk '$3 != $9 \
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{ print "user " $9 " mailbox is owned by " $3 }
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$1 != "-rw-------" \
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{ print "user " $9 " mailbox is " $1 ", group " $4 }' > $OUTPUT
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if [ -s $OUTPUT ] ; then
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printf "\nChecking mailbox ownership.\n"
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cat $OUTPUT
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fi
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# File systems should not be globally exported.
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if [ -s /etc/exports ] ; then
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awk '{
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if ($1 ~ /^#/)
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next;
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readonly = 0;
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for (i = 2; i <= NF; ++i) {
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if ($i ~ /-ro/)
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readonly = 1;
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else if ($i !~ /^-/)
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next;
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}
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if (readonly)
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print "File system " $1 " globally exported, read-only."
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else
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print "File system " $1 " globally exported, read-write."
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}' < /etc/exports > $OUTPUT
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if [ -s $OUTPUT ] ; then
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printf "\nChecking for globally exported file systems.\n"
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cat $OUTPUT
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fi
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fi
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# Display any changes in setuid/setgid files and devices.
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pending="\nChecking setuid/setgid files and devices:\n"
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(find / \( ! -fstype local -o -fstype fdesc -o -fstype kernfs \
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-o -fstype procfs \) -a -prune -o \
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-type f -a \( -perm -u+s -o -perm -g+s \) -print0 -o \
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! -type d -a ! -type f -a ! -type l -a ! -type s -print0 | \
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xargs -0 ls -ldgT | sort +9 > $LIST) 2> $OUTPUT
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# Display any errors that occurred during system file walk.
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if [ -s $OUTPUT ] ; then
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printf "${pending}Setuid/device find errors:\n"
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pending=
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cat $OUTPUT
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printf "\n"
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fi
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# Display any changes in the setuid/setgid file list.
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egrep -v '^[bc]' $LIST > $TMP1
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if [ -s $TMP1 ] ; then
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# Check to make sure uudecode isn't setuid.
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if grep -w uudecode $TMP1 > /dev/null ; then
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printf "${pending}\nUudecode is setuid.\n"
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pending=
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fi
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|
|
|
|
CUR=/var/backups/setuid.current
|
|
|
BACK=/var/backups/setuid.backup
|
|
|
|
|
|
if [ -s $CUR ] ; then
|
|
|
if cmp -s $CUR $TMP1 ; then
|
|
|
:
|
|
|
else
|
|
|
> $TMP2
|
|
|
join -110 -210 -v2 $CUR $TMP1 > $OUTPUT
|
|
|
if [ -s $OUTPUT ] ; then
|
|
|
printf "${pending}Setuid additions:\n"
|
|
|
pending=
|
|
|
tee -a $TMP2 < $OUTPUT
|
|
|
printf "\n"
|
|
|
fi
|
|
|
|
|
|
join -110 -210 -v1 $CUR $TMP1 > $OUTPUT
|
|
|
if [ -s $OUTPUT ] ; then
|
|
|
printf "${pending}Setuid deletions:\n"
|
|
|
pending=
|
|
|
tee -a $TMP2 < $OUTPUT
|
|
|
printf "\n"
|
|
|
fi
|
|
|
|
|
|
sort +9 $TMP2 $CUR $TMP1 | \
|
|
|
sed -e 's/[ ][ ]*/ /g' | uniq -u > $OUTPUT
|
|
|
if [ -s $OUTPUT ] ; then
|
|
|
printf "${pending}Setuid changes:\n"
|
|
|
pending=
|
|
|
column -t $OUTPUT
|
|
|
printf "\n"
|
|
|
fi
|
|
|
|
|
|
cp $CUR $BACK
|
|
|
cp $TMP1 $CUR
|
|
|
fi
|
|
|
else
|
|
|
printf "${pending}Setuid additions:\n"
|
|
|
pending=
|
|
|
column -t $TMP1
|
|
|
printf "\n"
|
|
|
cp $TMP1 $CUR
|
|
|
fi
|
|
|
fi
|
|
|
|
|
|
# Check for block and character disk devices that are readable or writeable
|
|
|
# or not owned by root.operator.
|
|
|
>$TMP1
|
|
|
DISKLIST="ccd dk fd hd hk hp jb kra ra rb rd rl rx rz sd up vnd wd xd"
|
|
|
for i in $DISKLIST; do
|
|
|
egrep "^b.*/${i}[0-9][0-9]*[a-p]$" $LIST >> $TMP1
|
|
|
egrep "^c.*/r${i}[0-9][0-9]*[a-p]$" $LIST >> $TMP1
|
|
|
done
|
|
|
|
|
|
awk '$3 != "root" || $4 != "operator" || $1 !~ /.rw-r-----/ \
|
|
|
{ printf("Disk %s is user %s, group %s, permissions %s.\n", \
|
|
|
$11, $3, $4, $1); }' < $TMP1 > $OUTPUT
|
|
|
if [ -s $OUTPUT ] ; then
|
|
|
printf "\nChecking disk ownership and permissions.\n"
|
|
|
cat $OUTPUT
|
|
|
printf "\n"
|
|
|
fi
|
|
|
|
|
|
# Display any changes in the device file list.
|
|
|
egrep '^[bc]' $LIST | sort +10 > $TMP1
|
|
|
if [ -s $TMP1 ] ; then
|
|
|
CUR=/var/backups/device.current
|
|
|
BACK=/var/backups/device.backup
|
|
|
|
|
|
if [ -s $CUR ] ; then
|
|
|
if cmp -s $CUR $TMP1 ; then
|
|
|
:
|
|
|
else
|
|
|
> $TMP2
|
|
|
join -111 -211 -v2 $CUR $TMP1 > $OUTPUT
|
|
|
if [ -s $OUTPUT ] ; then
|
|
|
printf "Device additions:\n"
|
|
|
tee -a $TMP2 < $OUTPUT
|
|
|
printf "\n"
|
|
|
fi
|
|
|
|
|
|
join -111 -211 -v1 $CUR $TMP1 > $OUTPUT
|
|
|
if [ -s $OUTPUT ] ; then
|
|
|
printf "Device deletions:\n"
|
|
|
tee -a $TMP2 < $OUTPUT
|
|
|
printf "\n"
|
|
|
fi
|
|
|
|
|
|
# Report any block device change. Ignore character
|
|
|
# devices, only the name is significant.
|
|
|
cat $TMP2 $CUR $TMP1 | \
|
|
|
sed -e '/^c/d' | \
|
|
|
sort +10 | \
|
|
|
sed -e 's/[ ][ ]*/ /g' | \
|
|
|
uniq -u > $OUTPUT
|
|
|
if [ -s $OUTPUT ] ; then
|
|
|
printf "Block device changes:\n"
|
|
|
column -t $OUTPUT
|
|
|
printf "\n"
|
|
|
fi
|
|
|
|
|
|
cp $CUR $BACK
|
|
|
cp $TMP1 $CUR
|
|
|
fi
|
|
|
else
|
|
|
printf "Device additions:\n"
|
|
|
column -t $TMP1
|
|
|
printf "\n"
|
|
|
cp $TMP1 $CUR
|
|
|
fi
|
|
|
fi
|
|
|
|
|
|
# Check special files.
|
|
|
# Check system binaries.
|
|
|
#
|
|
|
# Create the mtree tree specifications using:
|
|
|
#
|
|
|
# mtree -cx -pDIR -kcksum,gid,mode,nlink,size,link,time,uid > DIR.secure
|
|
|
# chown root.wheel DIR.secure
|
|
|
# chmod 600 DIR.secure
|
|
|
#
|
|
|
# Note, this is not complete protection against Trojan horsed binaries, as
|
|
|
# the hacker can modify the tree specification to match the replaced binary.
|
|
|
# For details on really protecting yourself against modified binaries, see
|
|
|
# the mtree(8) manual page.
|
|
|
if [ -d /etc/mtree ] ; then
|
|
|
cd /etc/mtree
|
|
|
mtree -e -p / -f /etc/mtree/special > $OUTPUT
|
|
|
if [ -s $OUTPUT ] ; then
|
|
|
printf "\nChecking special files and directories.\n"
|
|
|
cat $OUTPUT
|
|
|
fi
|
|
|
|
|
|
> $OUTPUT
|
|
|
for file in *.secure; do
|
|
|
[ $file = '*.secure' ] && continue
|
|
|
tree=`sed -n -e '3s/.* //p' -e 3q $file`
|
|
|
mtree -f $file -p $tree > $TMP1
|
|
|
if [ -s $TMP1 ] ; then
|
|
|
printf "\nChecking $tree:\n" >> $OUTPUT
|
|
|
cat $TMP1 >> $OUTPUT
|
|
|
fi
|
|
|
done
|
|
|
if [ -s $OUTPUT ] ; then
|
|
|
printf "\nChecking system binaries:\n"
|
|
|
cat $OUTPUT
|
|
|
fi
|
|
|
else
|
|
|
echo /etc/mtree is missing
|
|
|
fi
|
|
|
|
|
|
# List of files that get backed up and checked for any modifications. Each
|
|
|
# file is expected to have two backups, /var/backups/file.{current,backup}.
|
|
|
# Any changes cause the files to rotate.
|
|
|
if [ -s /etc/changelist ] ; then
|
|
|
for file in `cat /etc/changelist`; do
|
|
|
CUR=/var/backups/`basename $file`.current
|
|
|
BACK=/var/backups/`basename $file`.backup
|
|
|
if [ -s $file ] ; then
|
|
|
if [ -s $CUR ] ; then
|
|
|
diff $CUR $file > $OUTPUT
|
|
|
if [ -s $OUTPUT ] ; then
|
|
|
printf "\n======\n%s diffs (OLD < > NEW)\n======\n" $file
|
|
|
cat $OUTPUT
|
|
|
cp -p $CUR $BACK
|
|
|
cp -p $file $CUR
|
|
|
chown root.wheel $CUR $BACK
|
|
|
fi
|
|
|
else
|
|
|
cp -p $file $CUR
|
|
|
chown root.wheel $CUR
|
|
|
fi
|
|
|
fi
|
|
|
done
|
|
|
fi
|