[unix-history] / usr / src / etc / security

#!/bin/sh -
#
#	@(#)security	5.23 (Berkeley) %G%
#

PATH=/sbin:/usr/sbin:/bin:/usr/bin

umask 077

ERR=/tmp/_secure1.$$
TMP1=/tmp/_secure2.$$
TMP2=/tmp/_secure3.$$
TMP3=/tmp/_secure4.$$
LIST=/tmp/_secure5.$$
OUTPUT=/tmp/_secure6.$$

trap 'rm -f $ERR $TMP1 $TMP2 $TMP3 $LIST $OUTPUT' 0

# Check the master password file syntax.
MP=/etc/master.passwd
awk -F: '{
	if ($0 ~ /^[	 ]*$/) {
		printf("Line %d is a blank line.\n", NR);
		next;
	}
	if (NF != 10)
		printf("Line %d has the wrong number of fields.\n", NR);
	if ($1 !~ /^[A-Za-z0-9]*$/)
		printf("Login %s has non-numeric characters.\n", $1);
	if (length($1) > 8)
		printf("Login %s has more than 8 characters.\n", $1);
	if ($2 == "")
		printf("Login %s has no password.\n", $1);
	if (length($2) != 13 && ($10 ~ /.*sh$/ || $10 == ""))
		printf("Login %s is off but still has a valid shell.\n", $1);
	if ($3 == 0 && $1 != "root" && $1 != "toor")
		printf("Login %s has a user id of 0.\n", $1);
	if ($3 < 0)
		printf("Login %s has a negative user id.\n", $1);
	if ($4 < 0)
		printf("Login %s has a negative group id.\n", $1);
}' < $MP > $OUTPUT
if [ -s $OUTPUT ] ; then
	printf "\nChecking the $MP file:\n"
	cat $OUTPUT
fi

awk -F: '{ print $1 }' $MP | sort | uniq -d > $OUTPUT
if [ -s $OUTPUT ] ; then
	printf "\n$MP has duplicate user names.\n"
	column $OUTPUT
fi

awk -F: '{ print $1 " " $3 }' $MP | sort -n +1 | tee $TMP1 |
uniq -d -f 1 | awk '{ print $2 }' > $TMP2
if [ -s $TMP2 ] ; then
	printf "\n$MP has duplicate user id's.\n"
        while read uid; do
                grep -w $uid $TMP1
        done < $TMP2 | column
fi

# Backup the master password file; a special case, the normal backup
# mechanisms also print out file differences and we don't want to do
# that because this file has encrypted passwords in it.
CUR=/var/backups/`basename $MP`.current
BACK=/var/backups/`basename $MP`.backup
if [ -s $CUR ] ; then
	if cmp -s $CUR $MP; then
		:
	else
		cp -p $CUR $BACK
		cp -p $MP $CUR
		chown root.wheel $CUR
	fi
else
	cp -p $MP $CUR
	chown root.wheel $CUR
fi

# Check the group file syntax.
GRP=/etc/group
awk -F: '{
	if ($0 ~ /^[	 ]*$/) {
		printf("Line %d is a blank line.\n", NR);
		next;
	}
	if (NF != 4)
		printf("Line %d has the wrong number of fields.\n", NR);
	if ($1 !~ /^[A-za-z0-9]*$/)
		printf("Group %s has non-numeric characters.\n", $1);
	if (length($1) > 8)
		printf("Group %s has more than 8 characters.\n", $1);
	if ($3 !~ /[0-9]*/)
		printf("Login %s has a negative group id.\n", $1);
}' < $GRP > $OUTPUT
if [ -s $OUTPUT ] ; then
	printf "\nChecking the $GRP file:\n"
	cat $OUTPUT
fi

awk -F: '{ print $1 }' $GRP | sort | uniq -d > $OUTPUT
if [ -s $OUTPUT ] ; then
	printf "\n$GRP has duplicate group names.\n"
	column $OUTPUT
fi

# Check for root paths, umask values in startup files.
# The check for the root paths is problematical -- it's likely to fail
# in other environments.  Once the shells have been modified to warn
# of '.' in the path, the path tests should go away.
> $OUTPUT
rhome=/root
umaskset=no
list="/etc/csh.cshrc /etc/csh.login ${rhome}/.cshrc ${rhome}/.login"
for i in $list ; do
	if [ -f $i ] ; then
		if egrep umask $i > /dev/null ; then
			umaskset=yes
		fi
		egrep umask $i |
		awk '$2 % 100 < 20 \
			{ print "Root umask is group writeable" }
		     $2 % 10 < 2 \
			{ print "Root umask is other writeable" }' >> $OUTPUT
		/bin/csh -f -s << end-of-csh > /dev/null 2>&1
			unset path
			source $i
			/bin/ls -ldgT \$path > $TMP1
end-of-csh
		awk '{
			if ($10 ~ /^\.$/) {
				print "The root path includes .";
				next;
			}
		     }
		     $1 ~ /^d....w/ \
        { print "Root path directory " $10 " is group writeable." } \
		     $1 ~ /^d.......w/ \
        { print "Root path directory " $10 " is other writeable." }' \
		< $TMP1 >> $OUTPUT
	fi
done
if [ $umaskset = "no" -o -s $OUTPUT ] ; then
	printf "\nChecking root csh paths, umask values:\n$list\n"
	if [ -s $OUTPUT ]; then
		cat $OUTPUT
	fi
	if [ $umaskset = "no" ] ; then
		printf "\nRoot csh startup files do not set the umask.\n"
	fi
fi

> $OUTPUT
rhome=/root
umaskset=no
list="${rhome}/.profile"
for i in $list; do
	if [ -f $i ] ; then
		if egrep umask $i > /dev/null ; then
			umaskset=yes
		fi
		egrep umask $i |
		awk '$2 % 100 < 20 \
			{ print "Root umask is group writeable" } \
		     $2 % 10 < 2 \
			{ print "Root umask is other writeable" }' >> $OUTPUT
		/bin/sh << end-of-sh > /dev/null 2>&1
			PATH=
			. $i
			list=\`echo \$PATH | /usr/bin/sed -e 's/:/ /g'\`
			/bin/ls -ldgT \$list > $TMP1
end-of-sh
		awk '{
			if ($10 ~ /^\.$/) {
				print "The root path includes .";
				next;
			}
		     }
		     $1 ~ /^d....w/ \
        { print "Root path directory " $10 " is group writeable." } \
		     $1 ~ /^d.......w/ \
        { print "Root path directory " $10 " is other writeable." }' \
		< $TMP1 >> $OUTPUT

	fi
done
if [ $umaskset = "no" -o -s $OUTPUT ] ; then
	printf "\nChecking root sh paths, umask values:\n$list\n"
	if [ -s $OUTPUT ]; then
		cat $OUTPUT
	fi
	if [ $umaskset = "no" ] ; then
		printf "\nRoot sh startup files do not set the umask.\n"
	fi
fi

# Root and uucp should both be in /etc/ftpusers.
if egrep root /etc/ftpusers > /dev/null ; then
	:
else
	printf "\nRoot not listed in /etc/ftpusers file.\n"
fi
if egrep uucp /etc/ftpusers > /dev/null ; then
	:
else
	printf "\nUucp not listed in /etc/ftpusers file.\n"
fi

# Uudecode should not be in the /etc/aliases file.
if grep -w uudecode /etc/aliases; then
	printf "\nThere is an entry for uudecode in the /etc/aliases file.\n"
fi

# There should be no plus signs in /etc/hosts.equiv.
if egrep '\+|^$' /etc/hosts.equiv > /dev/null ; then
	printf "\nEmpty line or + in /etc/hosts.equiv file.\n"
fi

# Check for special users with .rhosts files.  Only root and toor should
# have a .rhosts files.  Also, .rhosts files should not have blank lines
# or plus signs.
awk -F: '$1 != "root" && $1 != "toor" && \
	($3 < 100 || $1 == "ftp" || $1 == "uucp") \
		{ print $1 " " $6 }' /etc/passwd |
while read uid homedir; do
	if [ -f ${homedir}/.rhosts ] ; then
		rhost=`ls -ldgT ${homedir}/.rhosts`
		printf "$uid: $rhost\n"
	fi
done > $OUTPUT
if [ -s $OUTPUT ] ; then
	printf "\nChecking for special users with .rhosts files.\n"
	cat $OUTPUT
fi

awk -F: '{ print $1 " " $6 }' /etc/passwd | \
while read uid homedir; do
	if [ -f ${homedir}/.rhosts ] && \
	    egrep '\+|^$' ${homedir}/.rhosts > /dev/null ; then
		printf "$uid: empty line or + in .rhosts file.\n"
	fi
done > $OUTPUT
if [ -s $OUTPUT ] ; then
	printf "\nChecking .rhosts files syntax.\n"
	cat $OUTPUT
fi

# Check home directories.  Directories should not be owned by someone else
# or writeable.
awk -F: '{ print $1 " " $6 }' /etc/passwd | \
while read uid homedir; do
	if [ -d ${homedir}/ ] ; then
		file=`ls -ldgT ${homedir}`
		printf "$uid $file\n"
	fi
done |
awk '$1 != $4 && $4 != "root" \
	{ print "user " $1 " home directory is owned by " $4 }
     $2 ~ /^-....w/ \
	{ print "user " $1 " home directory is group writeable" }
     $2 ~ /^-.......w/ \
	{ print "user " $1 " home directory is other writeable" }' > $OUTPUT
if [ -s $OUTPUT ] ; then
	printf "\nChecking home directories.\n"
	cat $OUTPUT
fi

# Files that should not be owned by someone else or readable.
list=".netrc .rhosts"
awk -F: '{ print $1 " " $6 }' /etc/passwd | \
while read uid homedir; do
	for f in $list ; do
		file=${homedir}/${f}
		if [ -f $file ] ; then
			printf "$uid $f `ls -ldgT $file`\n"
		fi
	done
done |
awk '$1 != $5 && $5 != "root" \
	{ print "user " $1 " " $2 " file is owned by " $5 }
     $3 ~ /^-...r/ \
	{ print "user " $1 " " $2 " file is group readable" }
     $3 ~ /^-......r/ \
	{ print "user " $1 " " $2 " file is other readable" }
     $3 ~ /^-....w/ \
	{ print "user " $1 " " $2 " file is group writeable" }
     $3 ~ /^-.......w/ \
	{ print "user " $1 " " $2 " file is other writeable" }' > $OUTPUT

# Files that should not be owned by someone else or writeable.
list=".bashrc .cshrc .emacsrc .exrc .forward .klogin .login .logout \
      .profile .tcshrc"
awk -F: '{ print $1 " " $6 }' /etc/passwd | \
while read uid homedir; do
	for f in $list ; do
		file=${homedir}/${f}
		if [ -f $file ] ; then
			printf "$uid $f `ls -ldgT $file`\n"
		fi
	done
done |
awk '$1 != $5 && $5 != "root" \
	{ print "user " $1 " " $2 " file is owned by " $5 }
     $3 ~ /^-....w/ \
	{ print "user " $1 " " $2 " file is group writeable" }
     $3 ~ /^-.......w/ \
	{ print "user " $1 " " $2 " file is other writeable" }' >> $OUTPUT
if [ -s $OUTPUT ] ; then
	printf "\nChecking dot files.\n"
	cat $OUTPUT
fi

# Mailboxes should be owned by user and unreadable.
ls -l /var/mail | sed 1d | \
awk '$3 != $9 \
	{ print "user " $9 " mailbox is owned by " $3 }
     $1 != "-rw-------" \
	{ print "user " $9 " mailbox is " $1 ", group " $4 }' > $OUTPUT
if [ -s $OUTPUT ] ; then
	printf "\nChecking mailbox ownership.\n"
	cat $OUTPUT
fi

# File systems should not be globally exported.
awk '{
	readonly = 0;
	for (i = 2; i <= NF; ++i) {
		if ($i ~ /-ro/)
			readonly = 1;
		else if ($i !~ /^-/)
			next;
	}
	if (readonly)
		print "File system " $1 " globally exported, read-only."
	else
		print "File system " $1 " globally exported, read-write."
}' < /etc/exports > $OUTPUT
if [ -s $OUTPUT ] ; then
	printf "\nChecking for globally exported file systems.\n"
	cat $OUTPUT
fi

# Display any changes in setuid files and devices.
printf "\nChecking setuid files and devices:\n"
(find / ! -fstype local -a -prune -o \
    \( -perm -u+s -o -perm -g+s -o ! -type d -a ! -type f -a ! -type l -a \
       ! -type s \) | \
sort | sed -e 's/^/ls -ldgT /' | sh > $LIST) 2> $OUTPUT

# Display any errors that occurred during system file walk.
if [ -s $OUTPUT ] ; then
	printf "Setuid/device find errors:\n"
	cat $OUTPUT
	printf "\n"
fi

# Display any changes in the setuid file list.
egrep -v '^[bc]' $LIST > $TMP1
if [ -s $TMP1 ] ; then
	# Check to make sure uudecode isn't setuid.
	if grep -w uudecode $TMP1 > /dev/null ; then
		printf "\nUudecode is setuid.\n"
	fi

	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 "Setuid additions:\n"
				tee -a $TMP2 < $OUTPUT
				printf "\n"
			fi

			join -110 -210 -v1 $CUR $TMP1 > $OUTPUT
			if [ -s $OUTPUT ] ; then
				printf "Setuid deletions:\n"
				tee -a $TMP2 < $OUTPUT
				printf "\n"
			fi

			sort +9 $TMP2 $CUR $TMP1 | \
			    sed -e 's/[	 ][	 ]*/ /g' | uniq -u > $OUTPUT
			if [ -s $OUTPUT ] ; then
				printf "Setuid changes:\n"
				column -t $OUTPUT
				printf "\n"
			fi

			cp $CUR $BACK
			cp $TMP1 $CUR
		fi
	else
		printf "Setuid additions:\n"
		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.
egrep '^b' $LIST > $TMP1
egrep '^c.*/rdk[0-9][0-9]*[a-h]$'  $LIST >> $TMP1
egrep '^c.*/rfd[0-9][0-9]*[a-h]$'  $LIST >> $TMP1
egrep '^c.*/rhd[0-9][0-9]*[a-h]$'  $LIST >> $TMP1
egrep '^c.*/rhk[0-9][0-9]*[a-h]$'  $LIST >> $TMP1
egrep '^c.*/rhp[0-9][0-9]*[a-h]$'  $LIST >> $TMP1
egrep '^c.*/rjb[0-9][0-9]*[a-h]$'  $LIST >> $TMP1
egrep '^c.*/rkra[0-9][0-9]*[a-h]$' $LIST >> $TMP1
egrep '^c.*/rra[0-9][0-9]*[a-h]$'  $LIST >> $TMP1
egrep '^c.*/rrb[0-9][0-9]*[a-h]$'  $LIST >> $TMP1
egrep '^c.*/rrd[0-9][0-9]*[a-h]$'  $LIST >> $TMP1
egrep '^c.*/rrl[0-9][0-9]*[a-h]$'  $LIST >> $TMP1
egrep '^c.*/rrx[0-9][0-9]*[a-h]$'  $LIST >> $TMP1
egrep '^c.*/rrz[0-9][0-9]*[a-h]$'  $LIST >> $TMP1
egrep '^c.*/rsd[0-9][0-9]*[a-h]$'  $LIST >> $TMP1
egrep '^c.*/rup[0-9][0-9]*[a-h]$'  $LIST >> $TMP1
egrep '^c.*/rwd[0-9][0-9]*[a-h]$'  $LIST >> $TMP1

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 cd /etc/mtree; then
	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
		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
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
Commit	Line	Data
525ea79f KB	1	#!/bin/sh -
525ea79f KB	2	#
8c93a907	3	# @(#)security 5.23 (Berkeley) %G%
525ea79f	4	#
07576f30	5
fd70cf43	6	PATH=/sbin:/usr/sbin:/bin:/usr/bin
525ea79f	7
e9a107b1	8	umask 077
383148a3	9
40835542 KB	10	ERR=/tmp/_secure1.$$
	11	TMP1=/tmp/_secure2.$$
	12	TMP2=/tmp/_secure3.$$
e9a107b1 KB	13	TMP3=/tmp/_secure4.$$
	14	LIST=/tmp/_secure5.$$
	15	OUTPUT=/tmp/_secure6.$$
	16
	17	trap 'rm -f $ERR $TMP1 $TMP2 $TMP3 $LIST $OUTPUT' 0
	18
28225475	19	# Check the master password file syntax.
e9a107b1 KB	20	MP=/etc/master.passwd
	21	awk -F: '{
	22	if ($0 ~ /^[ ]*$/) {
	23	printf("Line %d is a blank line.\n", NR);
	24	next;
	25	}
	26	if (NF != 10)
	27	printf("Line %d has the wrong number of fields.\n", NR);
d4409bb4	28	if ($1 !~ /^[A-Za-z0-9]*$/)
e9a107b1 KB	29	printf("Login %s has non-numeric characters.\n", $1);
	30	if (length($1) > 8)
	31	printf("Login %s has more than 8 characters.\n", $1);
	32	if ($2 == "")
	33	printf("Login %s has no password.\n", $1);
	34	if (length($2) != 13 && ($10 ~ /.*sh$/ \|\| $10 == ""))
	35	printf("Login %s is off but still has a valid shell.\n", $1);
	36	if ($3 == 0 && $1 != "root" && $1 != "toor")
	37	printf("Login %s has a user id of 0.\n", $1);
	38	if ($3 < 0)
	39	printf("Login %s has a negative user id.\n", $1);
	40	if ($4 < 0)
d4409bb4	41	printf("Login %s has a negative group id.\n", $1);
e9a107b1 KB	42	}' < $MP > $OUTPUT
	43	if [ -s $OUTPUT ] ; then
	44	printf "\nChecking the $MP file:\n"
	45	cat $OUTPUT
	46	fi
fd70cf43	47
e9a107b1 KB	48	awk -F: '{ print $1 }' $MP \| sort \| uniq -d > $OUTPUT
	49	if [ -s $OUTPUT ] ; then
	50	printf "\n$MP has duplicate user names.\n"
	51	column $OUTPUT
	52	fi
fd70cf43	53
e9a107b1 KB	54	awk -F: '{ print $1 " " $3 }' $MP \| sort -n +1 \| tee $TMP1 \|
	55	uniq -d -f 1 \| awk '{ print $2 }' > $TMP2
	56	if [ -s $TMP2 ] ; then
	57	printf "\n$MP has duplicate user id's.\n"
	58	while read uid; do
	59	grep -w $uid $TMP1
	60	done < $TMP2 \| column
	61	fi
8e55538e	62
8c93a907 KB	63	# Backup the master password file; a special case, the normal backup
	64	# mechanisms also print out file differences and we don't want to do
	65	# that because this file has encrypted passwords in it.
	66	CUR=/var/backups/`basename $MP`.current
	67	BACK=/var/backups/`basename $MP`.backup
	68	if [ -s $CUR ] ; then
	69	if cmp -s $CUR $MP; then
	70	:
	71	else
	72	cp -p $CUR $BACK
	73	cp -p $MP $CUR
	74	chown root.wheel $CUR
	75	fi
	76	else
	77	cp -p $MP $CUR
	78	chown root.wheel $CUR
	79	fi
	80
e9a107b1 KB	81	# Check the group file syntax.
	82	GRP=/etc/group
	83	awk -F: '{
	84	if ($0 ~ /^[ ]*$/) {
	85	printf("Line %d is a blank line.\n", NR);
	86	next;
	87	}
	88	if (NF != 4)
	89	printf("Line %d has the wrong number of fields.\n", NR);
76c990fe	90	if ($1 !~ /^[A-za-z0-9]*$/)
e9a107b1 KB	91	printf("Group %s has non-numeric characters.\n", $1);
	92	if (length($1) > 8)
	93	printf("Group %s has more than 8 characters.\n", $1);
	94	if ($3 !~ /[0-9]*/)
d4409bb4	95	printf("Login %s has a negative group id.\n", $1);
e9a107b1 KB	96	}' < $GRP > $OUTPUT
	97	if [ -s $OUTPUT ] ; then
	98	printf "\nChecking the $GRP file:\n"
	99	cat $OUTPUT
	100	fi
48e0a733	101
e9a107b1 KB	102	awk -F: '{ print $1 }' $GRP \| sort \| uniq -d > $OUTPUT
	103	if [ -s $OUTPUT ] ; then
	104	printf "\n$GRP has duplicate group names.\n"
	105	column $OUTPUT
	106	fi
48e0a733	107
e9a107b1	108	# Check for root paths, umask values in startup files.
28225475 KB	109	# The check for the root paths is problematical -- it's likely to fail
	110	# in other environments. Once the shells have been modified to warn
	111	# of '.' in the path, the path tests should go away.
e9a107b1 KB	112	> $OUTPUT
	113	rhome=/root
	114	umaskset=no
	115	list="/etc/csh.cshrc /etc/csh.login ${rhome}/.cshrc ${rhome}/.login"
	116	for i in $list ; do
	117	if [ -f $i ] ; then
	118	if egrep umask $i > /dev/null ; then
	119	umaskset=yes
48e0a733	120	fi
e9a107b1 KB	121	egrep umask $i \|
	122	awk '$2 % 100 < 20 \
	123	{ print "Root umask is group writeable" }
	124	$2 % 10 < 2 \
	125	{ print "Root umask is other writeable" }' >> $OUTPUT
	126	/bin/csh -f -s << end-of-csh > /dev/null 2>&1
	127	unset path
	128	source $i
	129	/bin/ls -ldgT \$path > $TMP1
	130	end-of-csh
	131	awk '{
76c990fe	132	if ($10 ~ /^\.$/) {
e9a107b1 KB	133	print "The root path includes .";
	134	next;
	135	}
	136	}
	137	$1 ~ /^d....w/ \
	138	{ print "Root path directory " $10 " is group writeable." } \
	139	$1 ~ /^d.......w/ \
	140	{ print "Root path directory " $10 " is other writeable." }' \
	141	< $TMP1 >> $OUTPUT
07576f30	142	fi
e9a107b1 KB	143	done
	144	if [ $umaskset = "no" -o -s $OUTPUT ] ; then
	145	printf "\nChecking root csh paths, umask values:\n$list\n"
	146	if [ -s $OUTPUT ]; then
	147	cat $OUTPUT
48e0a733	148	fi
e9a107b1 KB	149	if [ $umaskset = "no" ] ; then
e9a107b1 KB	150	printf "\nRoot csh startup files do not set the umask.\n"
48e0a733	151	fi
e9a107b1 KB	152	fi
	153
	154	> $OUTPUT
	155	rhome=/root
	156	umaskset=no
	157	list="${rhome}/.profile"
	158	for i in $list; do
	159	if [ -f $i ] ; then
	160	if egrep umask $i > /dev/null ; then
	161	umaskset=yes
	162	fi
	163	egrep umask $i \|
	164	awk '$2 % 100 < 20 \
	165	{ print "Root umask is group writeable" } \
	166	$2 % 10 < 2 \
	167	{ print "Root umask is other writeable" }' >> $OUTPUT
	168	/bin/sh << end-of-sh > /dev/null 2>&1
	169	PATH=
	170	. $i
	171	list=\`echo \$PATH \| /usr/bin/sed -e 's/:/ /g'\`
	172	/bin/ls -ldgT \$list > $TMP1
	173	end-of-sh
	174	awk '{
76c990fe	175	if ($10 ~ /^\.$/) {
e9a107b1 KB	176	print "The root path includes .";
	177	next;
	178	}
	179	}
	180	$1 ~ /^d....w/ \
	181	{ print "Root path directory " $10 " is group writeable." } \
	182	$1 ~ /^d.......w/ \
	183	{ print "Root path directory " $10 " is other writeable." }' \
	184	< $TMP1 >> $OUTPUT
48e0a733	185
48e0a733	186	fi
e9a107b1 KB	187	done
	188	if [ $umaskset = "no" -o -s $OUTPUT ] ; then
	189	printf "\nChecking root sh paths, umask values:\n$list\n"
	190	if [ -s $OUTPUT ]; then
	191	cat $OUTPUT
48e0a733	192	fi
e9a107b1 KB	193	if [ $umaskset = "no" ] ; then
e9a107b1 KB	194	printf "\nRoot sh startup files do not set the umask.\n"
48e0a733	195	fi
e9a107b1 KB	196	fi
	197
	198	# Root and uucp should both be in /etc/ftpusers.
	199	if egrep root /etc/ftpusers > /dev/null ; then
	200	:
	201	else
	202	printf "\nRoot not listed in /etc/ftpusers file.\n"
	203	fi
	204	if egrep uucp /etc/ftpusers > /dev/null ; then
	205	:
	206	else
	207	printf "\nUucp not listed in /etc/ftpusers file.\n"
	208	fi
	209
28225475	210	# Uudecode should not be in the /etc/aliases file.
e9a107b1 KB	211	if grep -w uudecode /etc/aliases; then
	212	printf "\nThere is an entry for uudecode in the /etc/aliases file.\n"
	213	fi
	214
28225475	215	# There should be no plus signs in /etc/hosts.equiv.
e9a107b1 KB	216	if egrep '\+\|^$' /etc/hosts.equiv > /dev/null ; then
	217	printf "\nEmpty line or + in /etc/hosts.equiv file.\n"
	218	fi
	219
	220	# Check for special users with .rhosts files. Only root and toor should
	221	# have a .rhosts files. Also, .rhosts files should not have blank lines
	222	# or plus signs.
	223	awk -F: '$1 != "root" && $1 != "toor" && \
	224	($3 < 100 \|\| $1 == "ftp" \|\| $1 == "uucp") \
	225	{ print $1 " " $6 }' /etc/passwd \|
	226	while read uid homedir; do
	227	if [ -f ${homedir}/.rhosts ] ; then
	228	rhost=`ls -ldgT ${homedir}/.rhosts`
	229	printf "$uid: $rhost\n"
48e0a733	230	fi
e9a107b1 KB	231	done > $OUTPUT
	232	if [ -s $OUTPUT ] ; then
	233	printf "\nChecking for special users with .rhosts files.\n"
	234	cat $OUTPUT
	235	fi
48e0a733	236
e9a107b1 KB	237	awk -F: '{ print $1 " " $6 }' /etc/passwd \| \
	238	while read uid homedir; do
	239	if [ -f ${homedir}/.rhosts ] && \
	240	egrep '\+\|^$' ${homedir}/.rhosts > /dev/null ; then
	241	printf "$uid: empty line or + in .rhosts file.\n"
	242	fi
	243	done > $OUTPUT
	244	if [ -s $OUTPUT ] ; then
	245	printf "\nChecking .rhosts files syntax.\n"
	246	cat $OUTPUT
	247	fi
48e0a733	248
28225475 KB	249	# Check home directories. Directories should not be owned by someone else
28225475 KB	250	# or writeable.
e9a107b1 KB	251	awk -F: '{ print $1 " " $6 }' /etc/passwd \| \
	252	while read uid homedir; do
	253	if [ -d ${homedir}/ ] ; then
	254	file=`ls -ldgT ${homedir}`
	255	printf "$uid $file\n"
	256	fi
	257	done \|
	258	awk '$1 != $4 && $4 != "root" \
	259	{ print "user " $1 " home directory is owned by " $4 }
	260	$2 ~ /^-....w/ \
	261	{ print "user " $1 " home directory is group writeable" }
	262	$2 ~ /^-.......w/ \
	263	{ print "user " $1 " home directory is other writeable" }' > $OUTPUT
	264	if [ -s $OUTPUT ] ; then
	265	printf "\nChecking home directories.\n"
	266	cat $OUTPUT
	267	fi
48e0a733	268
e9a107b1 KB	269	# Files that should not be owned by someone else or readable.
	270	list=".netrc .rhosts"
	271	awk -F: '{ print $1 " " $6 }' /etc/passwd \| \
	272	while read uid homedir; do
	273	for f in $list ; do
	274	file=${homedir}/${f}
	275	if [ -f $file ] ; then
	276	printf "$uid $f `ls -ldgT $file`\n"
48e0a733	277	fi
e9a107b1 KB	278	done
	279	done \|
	280	awk '$1 != $5 && $5 != "root" \
	281	{ print "user " $1 " " $2 " file is owned by " $5 }
	282	$3 ~ /^-...r/ \
	283	{ print "user " $1 " " $2 " file is group readable" }
	284	$3 ~ /^-......r/ \
	285	{ print "user " $1 " " $2 " file is other readable" }
	286	$3 ~ /^-....w/ \
	287	{ print "user " $1 " " $2 " file is group writeable" }
	288	$3 ~ /^-.......w/ \
	289	{ print "user " $1 " " $2 " file is other writeable" }' > $OUTPUT
48e0a733	290
e9a107b1 KB	291	# Files that should not be owned by someone else or writeable.
	292	list=".bashrc .cshrc .emacsrc .exrc .forward .klogin .login .logout \
	293	.profile .tcshrc"
	294	awk -F: '{ print $1 " " $6 }' /etc/passwd \| \
	295	while read uid homedir; do
	296	for f in $list ; do
	297	file=${homedir}/${f}
	298	if [ -f $file ] ; then
	299	printf "$uid $f `ls -ldgT $file`\n"
48e0a733	300	fi
e9a107b1 KB	301	done
	302	done \|
	303	awk '$1 != $5 && $5 != "root" \
	304	{ print "user " $1 " " $2 " file is owned by " $5 }
	305	$3 ~ /^-....w/ \
	306	{ print "user " $1 " " $2 " file is group writeable" }
	307	$3 ~ /^-.......w/ \
	308	{ print "user " $1 " " $2 " file is other writeable" }' >> $OUTPUT
	309	if [ -s $OUTPUT ] ; then
	310	printf "\nChecking dot files.\n"
	311	cat $OUTPUT
	312	fi
	313
28225475	314	# Mailboxes should be owned by user and unreadable.
e9a107b1 KB	315	ls -l /var/mail \| sed 1d \| \
	316	awk '$3 != $9 \
	317	{ print "user " $9 " mailbox is owned by " $3 }
	318	$1 != "-rw-------" \
	319	{ print "user " $9 " mailbox is " $1 ", group " $4 }' > $OUTPUT
	320	if [ -s $OUTPUT ] ; then
	321	printf "\nChecking mailbox ownership.\n"
	322	cat $OUTPUT
	323	fi
8e55538e	324
28225475	325	# File systems should not be globally exported.
07576f30 KB	326	awk '{
	327	readonly = 0;
	328	for (i = 2; i <= NF; ++i) {
	329	if ($i ~ /-ro/)
	330	readonly = 1;
	331	else if ($i !~ /^-/)
	332	next;
	333	}
	334	if (readonly)
	335	print "File system " $1 " globally exported, read-only."
	336	else
	337	print "File system " $1 " globally exported, read-write."
e9a107b1 KB	338	}' < /etc/exports > $OUTPUT
	339	if [ -s $OUTPUT ] ; then
	340	printf "\nChecking for globally exported file systems.\n"
	341	cat $OUTPUT
	342	fi
07576f30	343
28225475	344	# Display any changes in setuid files and devices.
e9a107b1 KB	345	printf "\nChecking setuid files and devices:\n"
	346	(find / ! -fstype local -a -prune -o \
	347	\( -perm -u+s -o -perm -g+s -o ! -type d -a ! -type f -a ! -type l -a \
	348	! -type s \) \| \
	349	sort \| sed -e 's/^/ls -ldgT /' \| sh > $LIST) 2> $OUTPUT
383148a3	350
40835542	351	# Display any errors that occurred during system file walk.
e9a107b1 KB	352	if [ -s $OUTPUT ] ; then
	353	printf "Setuid/device find errors:\n"
	354	cat $OUTPUT
	355	printf "\n"
383148a3 KB	356	fi
383148a3 KB	357
40835542	358	# Display any changes in the setuid file list.
e9a107b1	359	egrep -v '^[bc]' $LIST > $TMP1
e9a107b1 KB	360	if [ -s $TMP1 ] ; then
	361	# Check to make sure uudecode isn't setuid.
	362	if grep -w uudecode $TMP1 > /dev/null ; then
	363	printf "\nUudecode is setuid.\n"
	364	fi
	365
	366	CUR=/var/backups/setuid.current
	367	BACK=/var/backups/setuid.backup
383148a3	368
40835542	369	if [ -s $CUR ] ; then
e9a107b1	370	if cmp -s $CUR $TMP1 ; then
8e55538e KB	371	:
8e55538e KB	372	else
e9a107b1 KB	373	> $TMP2
	374	join -110 -210 -v2 $CUR $TMP1 > $OUTPUT
	375	if [ -s $OUTPUT ] ; then
	376	printf "Setuid additions:\n"
	377	tee -a $TMP2 < $OUTPUT
	378	printf "\n"
8e55538e KB	379	fi
8e55538e KB	380
e9a107b1 KB	381	join -110 -210 -v1 $CUR $TMP1 > $OUTPUT
	382	if [ -s $OUTPUT ] ; then
	383	printf "Setuid deletions:\n"
	384	tee -a $TMP2 < $OUTPUT
	385	printf "\n"
8e55538e KB	386	fi
8e55538e KB	387
e9a107b1 KB	388	sort +9 $TMP2 $CUR $TMP1 \| \
	389	sed -e 's/[ ][ ]*/ /g' \| uniq -u > $OUTPUT
	390	if [ -s $OUTPUT ] ; then
	391	printf "Setuid changes:\n"
	392	column -t $OUTPUT
	393	printf "\n"
8e55538e KB	394	fi
8e55538e KB	395
e9a107b1 KB	396	cp $CUR $BACK
e9a107b1 KB	397	cp $TMP1 $CUR
8e55538e KB	398	fi
8e55538e KB	399	else
e9a107b1	400	printf "Setuid additions:\n"
d0381ed9	401	column -t $TMP1
e9a107b1 KB	402	printf "\n"
e9a107b1 KB	403	cp $TMP1 $CUR
8e55538e	404	fi
525ea79f	405	fi
525ea79f	406
28225475	407	# Check for block and character disk devices that are readable or writeable
d0381ed9	408	# or not owned by root.operator.
e9a107b1 KB	409	egrep '^b' $LIST > $TMP1
	410	egrep '^c./rdk[0-9][0-9][a-h]$' $LIST >> $TMP1
	411	egrep '^c./rfd[0-9][0-9][a-h]$' $LIST >> $TMP1
	412	egrep '^c./rhd[0-9][0-9][a-h]$' $LIST >> $TMP1
	413	egrep '^c./rhk[0-9][0-9][a-h]$' $LIST >> $TMP1
	414	egrep '^c./rhp[0-9][0-9][a-h]$' $LIST >> $TMP1
	415	egrep '^c./rjb[0-9][0-9][a-h]$' $LIST >> $TMP1
	416	egrep '^c./rkra[0-9][0-9][a-h]$' $LIST >> $TMP1
	417	egrep '^c./rra[0-9][0-9][a-h]$' $LIST >> $TMP1
	418	egrep '^c./rrb[0-9][0-9][a-h]$' $LIST >> $TMP1
	419	egrep '^c./rrd[0-9][0-9][a-h]$' $LIST >> $TMP1
	420	egrep '^c./rrl[0-9][0-9][a-h]$' $LIST >> $TMP1
	421	egrep '^c./rrx[0-9][0-9][a-h]$' $LIST >> $TMP1
	422	egrep '^c./rrz[0-9][0-9][a-h]$' $LIST >> $TMP1
	423	egrep '^c./rsd[0-9][0-9][a-h]$' $LIST >> $TMP1
	424	egrep '^c./rup[0-9][0-9][a-h]$' $LIST >> $TMP1
	425	egrep '^c./rwd[0-9][0-9][a-h]$' $LIST >> $TMP1
	426
d0381ed9 KB	427	awk '$3 != "root" \|\| $4 != "operator" \|\| $1 !~ /.rw-r-----/ \
	428	{ printf("Disk %s is user %s, group %s, permissions %s.\n", \
	429	$11, $3, $4, $1); }' < $TMP1 > $OUTPUT
e9a107b1 KB	430	if [ -s $OUTPUT ] ; then
	431	printf "\nChecking disk ownership and permissions.\n"
	432	cat $OUTPUT
	433	printf "\n"
	434	fi
	435
40835542	436	# Display any changes in the device file list.
28225475	437	egrep '^[bc]' $LIST \| sort +10 > $TMP1
e9a107b1 KB	438	if [ -s $TMP1 ] ; then
	439	CUR=/var/backups/device.current
	440	BACK=/var/backups/device.backup
40835542 KB	441
40835542 KB	442	if [ -s $CUR ] ; then
e9a107b1	443	if cmp -s $CUR $TMP1 ; then
40835542 KB	444	:
40835542 KB	445	else
e9a107b1 KB	446	> $TMP2
	447	join -111 -211 -v2 $CUR $TMP1 > $OUTPUT
	448	if [ -s $OUTPUT ] ; then
	449	printf "Device additions:\n"
	450	tee -a $TMP2 < $OUTPUT
	451	printf "\n"
40835542 KB	452	fi
40835542 KB	453
e9a107b1 KB	454	join -111 -211 -v1 $CUR $TMP1 > $OUTPUT
	455	if [ -s $OUTPUT ] ; then
	456	printf "Device deletions:\n"
	457	tee -a $TMP2 < $OUTPUT
	458	printf "\n"
40835542 KB	459	fi
40835542 KB	460
d0381ed9 KB	461	# Report any block device change. Ignore character
	462	# devices, only the name is significant.
	463	cat $TMP2 $CUR $TMP1 \| \
	464	sed -e '/^c/d' \| \
	465	sort +10 \| \
e9a107b1	466	sed -e 's/[ ][ ]*/ /g' \| \
d0381ed9	467	uniq -u > $OUTPUT
e9a107b1	468	if [ -s $OUTPUT ] ; then
d0381ed9	469	printf "Block device changes:\n"
e9a107b1 KB	470	column -t $OUTPUT
e9a107b1 KB	471	printf "\n"
40835542 KB	472	fi
40835542 KB	473
e9a107b1 KB	474	cp $CUR $BACK
e9a107b1 KB	475	cp $TMP1 $CUR
40835542 KB	476	fi
40835542 KB	477	else
e9a107b1	478	printf "Device additions:\n"
d0381ed9	479	column -t $TMP1
e9a107b1 KB	480	printf "\n"
e9a107b1 KB	481	cp $TMP1 $CUR
40835542 KB	482	fi
40835542 KB	483	fi
40835542	484
08a2d709 KB	485	# Check special files.
	486	# Check system binaries.
	487	#
fd70cf43 KB	488	# Create the mtree tree specifications using:
fd70cf43 KB	489	#
e9a107b1 KB	490	# mtree -cx -pDIR -kcksum,gid,mode,nlink,size,link,time,uid > DIR.secure
	491	# chown root.wheel DIR.SECURE
	492	# chmod 600 DIR.SECURE
fd70cf43 KB	493	#
	494	# Note, this is not complete protection against Trojan horsed binaries, as
	495	# the hacker can modify the tree specification to match the replaced binary.
	496	# For details on really protecting yourself against modified binaries, see
	497	# the mtree(8) manual page.
fd70cf43	498	if cd /etc/mtree; then
e9a107b1 KB	499	mtree -e -p / -f /etc/mtree/special > $OUTPUT
	500	if [ -s $OUTPUT ] ; then
	501	printf "\nChecking special files and directories.\n"
	502	cat $OUTPUT
	503	fi
	504
	505	> $OUTPUT
fd70cf43 KB	506	for file in *.secure; do
fd70cf43 KB	507	tree=`sed -n -e '3s/.* //p' -e 3q $file`
e9a107b1 KB	508	mtree -f $file -p $tree > $TMP1
	509	if [ -s $TMP1 ]; then
	510	printf "\nChecking $tree:\n" >> $OUTPUT
	511	cat $TMP1 >> $OUTPUT
	512	fi
fd70cf43	513	done
e9a107b1 KB	514	if [ -s $OUTPUT ] ; then
	515	printf "\nChecking system binaries:\n"
	516	cat $OUTPUT
	517	fi
fd70cf43	518	fi
8c93a907 KB	519
	520	# List of files that get backed up and checked for any modifications. Each
	521	# file is expected to have two backups, /var/backups/file.{current,backup}.
	522	# Any changes cause the files to rotate.
	523	if [ -s /etc/changelist ] ; then
	524	for file in `cat /etc/changelist`; do
	525	CUR=/var/backups/`basename $file`.current
	526	BACK=/var/backups/`basename $file`.backup
	527	if [ -s $file ]; then
	528	if [ -s $CUR ] ; then
	529	diff $CUR $file > $OUTPUT
	530	if [ -s $OUTPUT ] ; then
	531	printf "\n======\n%s diffs (OLD < > NEW)\n======\n" $file
	532	cat $OUTPUT
	533	cp -p $CUR $BACK
	534	cp -p $file $CUR
	535	chown root.wheel $CUR $BACK
	536	fi
	537	else
	538	cp -p $file $CUR
	539	chown root.wheel $CUR
	540	fi
	541	fi
	542	done
	543	fi