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

#!/bin/sh -
#
#	@(#)security	5.19 (Berkeley) %G%
#

# Script to check basic system security.  Checks included are:
#	Password and group file check.
#	Root umask, dot in root's path.
#	Root and uucp in /etc/ftpusers.
#	Entry for uudecode in /etc/aliases, if uudecode is setuid.
#	Hosts.equiv syntax.
#	Special users that have .rhosts files, .rhosts file syntax.
#	Home directory and dot-file ownership and permissions.
#	Mailbox ownership and permissions.
#	Globally exported NFS file systems.
#	Changes in setuid and device files.
#	Block and character disk device ownership and permissions.
#	File list from /etc/mtree/special.
#	System binaries as described by files in /etc/mtree.

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 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

# 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.
> $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 aliases file.
if grep -w uudecode /etc/aliases; then
	printf "\nThere is an entry for uudecode in the /etc/aliases file.\n"
fi

# Check for 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, dot files.
# 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

# Check mailbox ownership and permissions.
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

# Check for globally exported file systems.
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 setuid and device changes.
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

egrep '^[bc]' $LIST | sort +10 > $TMP1
# Display any changes in the device file list.
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
Commit	Line	Data
525ea79f KB	1	#!/bin/sh -
525ea79f KB	2	#
d4409bb4	3	# @(#)security 5.19 (Berkeley) %G%
525ea79f	4	#
07576f30 KB	5
07576f30 KB	6	# Script to check basic system security. Checks included are:
e9a107b1 KB	7	# Password and group file check.
	8	# Root umask, dot in root's path.
	9	# Root and uucp in /etc/ftpusers.
	10	# Entry for uudecode in /etc/aliases, if uudecode is setuid.
	11	# Hosts.equiv syntax.
	12	# Special users that have .rhosts files, .rhosts file syntax.
07576f30 KB	13	# Home directory and dot-file ownership and permissions.
07576f30 KB	14	# Mailbox ownership and permissions.
e9a107b1	15	# Globally exported NFS file systems.
07576f30 KB	16	# Changes in setuid and device files.
07576f30 KB	17	# Block and character disk device ownership and permissions.
e9a107b1	18	# File list from /etc/mtree/special.
07576f30 KB	19	# System binaries as described by files in /etc/mtree.
07576f30 KB	20
fd70cf43	21	PATH=/sbin:/usr/sbin:/bin:/usr/bin
525ea79f	22
e9a107b1	23	umask 077
383148a3	24
40835542 KB	25	ERR=/tmp/_secure1.$$
	26	TMP1=/tmp/_secure2.$$
	27	TMP2=/tmp/_secure3.$$
e9a107b1 KB	28	TMP3=/tmp/_secure4.$$
	29	LIST=/tmp/_secure5.$$
	30	OUTPUT=/tmp/_secure6.$$
	31
	32	trap 'rm -f $ERR $TMP1 $TMP2 $TMP3 $LIST $OUTPUT' 0
	33
	34	# Check the password file syntax.
	35	MP=/etc/master.passwd
	36	awk -F: '{
	37	if ($0 ~ /^[ ]*$/) {
	38	printf("Line %d is a blank line.\n", NR);
	39	next;
	40	}
	41	if (NF != 10)
	42	printf("Line %d has the wrong number of fields.\n", NR);
d4409bb4	43	if ($1 !~ /^[A-Za-z0-9]*$/)
e9a107b1 KB	44	printf("Login %s has non-numeric characters.\n", $1);
	45	if (length($1) > 8)
	46	printf("Login %s has more than 8 characters.\n", $1);
	47	if ($2 == "")
	48	printf("Login %s has no password.\n", $1);
	49	if (length($2) != 13 && ($10 ~ /.*sh$/ \|\| $10 == ""))
	50	printf("Login %s is off but still has a valid shell.\n", $1);
	51	if ($3 == 0 && $1 != "root" && $1 != "toor")
	52	printf("Login %s has a user id of 0.\n", $1);
	53	if ($3 < 0)
	54	printf("Login %s has a negative user id.\n", $1);
	55	if ($4 < 0)
d4409bb4	56	printf("Login %s has a negative group id.\n", $1);
e9a107b1 KB	57	}' < $MP > $OUTPUT
	58	if [ -s $OUTPUT ] ; then
	59	printf "\nChecking the $MP file:\n"
	60	cat $OUTPUT
	61	fi
fd70cf43	62
e9a107b1 KB	63	awk -F: '{ print $1 }' $MP \| sort \| uniq -d > $OUTPUT
	64	if [ -s $OUTPUT ] ; then
	65	printf "\n$MP has duplicate user names.\n"
	66	column $OUTPUT
	67	fi
fd70cf43	68
e9a107b1 KB	69	awk -F: '{ print $1 " " $3 }' $MP \| sort -n +1 \| tee $TMP1 \|
	70	uniq -d -f 1 \| awk '{ print $2 }' > $TMP2
	71	if [ -s $TMP2 ] ; then
	72	printf "\n$MP has duplicate user id's.\n"
	73	while read uid; do
	74	grep -w $uid $TMP1
	75	done < $TMP2 \| column
	76	fi
8e55538e	77
e9a107b1 KB	78	# Check the group file syntax.
	79	GRP=/etc/group
	80	awk -F: '{
	81	if ($0 ~ /^[ ]*$/) {
	82	printf("Line %d is a blank line.\n", NR);
	83	next;
	84	}
	85	if (NF != 4)
	86	printf("Line %d has the wrong number of fields.\n", NR);
	87	if ($1 !~ /[A-za-z0-9]*/)
	88	printf("Group %s has non-numeric characters.\n", $1);
	89	if (length($1) > 8)
	90	printf("Group %s has more than 8 characters.\n", $1);
	91	if ($3 !~ /[0-9]*/)
d4409bb4	92	printf("Login %s has a negative group id.\n", $1);
e9a107b1 KB	93	}' < $GRP > $OUTPUT
	94	if [ -s $OUTPUT ] ; then
	95	printf "\nChecking the $GRP file:\n"
	96	cat $OUTPUT
	97	fi
48e0a733	98
e9a107b1 KB	99	awk -F: '{ print $1 }' $GRP \| sort \| uniq -d > $OUTPUT
	100	if [ -s $OUTPUT ] ; then
	101	printf "\n$GRP has duplicate group names.\n"
	102	column $OUTPUT
	103	fi
48e0a733	104
e9a107b1 KB	105	# Check for root paths, umask values in startup files.
	106	> $OUTPUT
	107	rhome=/root
	108	umaskset=no
	109	list="/etc/csh.cshrc /etc/csh.login ${rhome}/.cshrc ${rhome}/.login"
	110	for i in $list ; do
	111	if [ -f $i ] ; then
	112	if egrep umask $i > /dev/null ; then
	113	umaskset=yes
48e0a733	114	fi
e9a107b1 KB	115	egrep umask $i \|
	116	awk '$2 % 100 < 20 \
	117	{ print "Root umask is group writeable" }
	118	$2 % 10 < 2 \
	119	{ print "Root umask is other writeable" }' >> $OUTPUT
	120	/bin/csh -f -s << end-of-csh > /dev/null 2>&1
	121	unset path
	122	source $i
	123	/bin/ls -ldgT \$path > $TMP1
	124	end-of-csh
	125	awk '{
	126	if ($10 ~ /\./) {
	127	print "The root path includes .";
	128	next;
	129	}
	130	}
	131	$1 ~ /^d....w/ \
	132	{ print "Root path directory " $10 " is group writeable." } \
	133	$1 ~ /^d.......w/ \
	134	{ print "Root path directory " $10 " is other writeable." }' \
	135	< $TMP1 >> $OUTPUT
07576f30	136	fi
e9a107b1 KB	137	done
	138	if [ $umaskset = "no" -o -s $OUTPUT ] ; then
	139	printf "\nChecking root csh paths, umask values:\n$list\n"
	140	if [ -s $OUTPUT ]; then
	141	cat $OUTPUT
48e0a733	142	fi
e9a107b1 KB	143	if [ $umaskset = "no" ] ; then
e9a107b1 KB	144	printf "\nRoot csh startup files do not set the umask.\n"
48e0a733	145	fi
e9a107b1 KB	146	fi
	147
	148	> $OUTPUT
	149	rhome=/root
	150	umaskset=no
	151	list="${rhome}/.profile"
	152	for i in $list; do
	153	if [ -f $i ] ; then
	154	if egrep umask $i > /dev/null ; then
	155	umaskset=yes
	156	fi
	157	egrep umask $i \|
	158	awk '$2 % 100 < 20 \
	159	{ print "Root umask is group writeable" } \
	160	$2 % 10 < 2 \
	161	{ print "Root umask is other writeable" }' >> $OUTPUT
	162	/bin/sh << end-of-sh > /dev/null 2>&1
	163	PATH=
	164	. $i
	165	list=\`echo \$PATH \| /usr/bin/sed -e 's/:/ /g'\`
	166	/bin/ls -ldgT \$list > $TMP1
	167	end-of-sh
	168	awk '{
	169	if ($10 ~ /\./) {
	170	print "The root path includes .";
	171	next;
	172	}
	173	}
	174	$1 ~ /^d....w/ \
	175	{ print "Root path directory " $10 " is group writeable." } \
	176	$1 ~ /^d.......w/ \
	177	{ print "Root path directory " $10 " is other writeable." }' \
	178	< $TMP1 >> $OUTPUT
48e0a733	179
48e0a733	180	fi
e9a107b1 KB	181	done
	182	if [ $umaskset = "no" -o -s $OUTPUT ] ; then
	183	printf "\nChecking root sh paths, umask values:\n$list\n"
	184	if [ -s $OUTPUT ]; then
	185	cat $OUTPUT
48e0a733	186	fi
e9a107b1 KB	187	if [ $umaskset = "no" ] ; then
e9a107b1 KB	188	printf "\nRoot sh startup files do not set the umask.\n"
48e0a733	189	fi
e9a107b1 KB	190	fi
	191
	192	# Root and uucp should both be in /etc/ftpusers.
	193	if egrep root /etc/ftpusers > /dev/null ; then
	194	:
	195	else
	196	printf "\nRoot not listed in /etc/ftpusers file.\n"
	197	fi
	198	if egrep uucp /etc/ftpusers > /dev/null ; then
	199	:
	200	else
	201	printf "\nUucp not listed in /etc/ftpusers file.\n"
	202	fi
	203
	204	# Uudecode should not be in the aliases file.
	205	if grep -w uudecode /etc/aliases; then
	206	printf "\nThere is an entry for uudecode in the /etc/aliases file.\n"
	207	fi
	208
	209	# Check for plus signs in /etc/hosts.equiv.
	210	if egrep '\+\|^$' /etc/hosts.equiv > /dev/null ; then
	211	printf "\nEmpty line or + in /etc/hosts.equiv file.\n"
	212	fi
	213
	214	# Check for special users with .rhosts files. Only root and toor should
	215	# have a .rhosts files. Also, .rhosts files should not have blank lines
	216	# or plus signs.
	217	awk -F: '$1 != "root" && $1 != "toor" && \
	218	($3 < 100 \|\| $1 == "ftp" \|\| $1 == "uucp") \
	219	{ print $1 " " $6 }' /etc/passwd \|
	220	while read uid homedir; do
	221	if [ -f ${homedir}/.rhosts ] ; then
	222	rhost=`ls -ldgT ${homedir}/.rhosts`
	223	printf "$uid: $rhost\n"
48e0a733	224	fi
e9a107b1 KB	225	done > $OUTPUT
	226	if [ -s $OUTPUT ] ; then
	227	printf "\nChecking for special users with .rhosts files.\n"
	228	cat $OUTPUT
	229	fi
48e0a733	230
e9a107b1 KB	231	awk -F: '{ print $1 " " $6 }' /etc/passwd \| \
	232	while read uid homedir; do
	233	if [ -f ${homedir}/.rhosts ] && \
	234	egrep '\+\|^$' ${homedir}/.rhosts > /dev/null ; then
	235	printf "$uid: empty line or + in .rhosts file.\n"
	236	fi
	237	done > $OUTPUT
	238	if [ -s $OUTPUT ] ; then
	239	printf "\nChecking .rhosts files syntax.\n"
	240	cat $OUTPUT
	241	fi
48e0a733	242
e9a107b1 KB	243	# Check home directories, dot files.
	244	# Directories should not be owned by someone else or writeable.
	245	awk -F: '{ print $1 " " $6 }' /etc/passwd \| \
	246	while read uid homedir; do
	247	if [ -d ${homedir}/ ] ; then
	248	file=`ls -ldgT ${homedir}`
	249	printf "$uid $file\n"
	250	fi
	251	done \|
	252	awk '$1 != $4 && $4 != "root" \
	253	{ print "user " $1 " home directory is owned by " $4 }
	254	$2 ~ /^-....w/ \
	255	{ print "user " $1 " home directory is group writeable" }
	256	$2 ~ /^-.......w/ \
	257	{ print "user " $1 " home directory is other writeable" }' > $OUTPUT
	258	if [ -s $OUTPUT ] ; then
	259	printf "\nChecking home directories.\n"
	260	cat $OUTPUT
	261	fi
48e0a733	262
e9a107b1 KB	263	# Files that should not be owned by someone else or readable.
	264	list=".netrc .rhosts"
	265	awk -F: '{ print $1 " " $6 }' /etc/passwd \| \
	266	while read uid homedir; do
	267	for f in $list ; do
	268	file=${homedir}/${f}
	269	if [ -f $file ] ; then
	270	printf "$uid $f `ls -ldgT $file`\n"
48e0a733	271	fi
e9a107b1 KB	272	done
	273	done \|
	274	awk '$1 != $5 && $5 != "root" \
	275	{ print "user " $1 " " $2 " file is owned by " $5 }
	276	$3 ~ /^-...r/ \
	277	{ print "user " $1 " " $2 " file is group readable" }
	278	$3 ~ /^-......r/ \
	279	{ print "user " $1 " " $2 " file is other readable" }
	280	$3 ~ /^-....w/ \
	281	{ print "user " $1 " " $2 " file is group writeable" }
	282	$3 ~ /^-.......w/ \
	283	{ print "user " $1 " " $2 " file is other writeable" }' > $OUTPUT
48e0a733	284
e9a107b1 KB	285	# Files that should not be owned by someone else or writeable.
	286	list=".bashrc .cshrc .emacsrc .exrc .forward .klogin .login .logout \
	287	.profile .tcshrc"
	288	awk -F: '{ print $1 " " $6 }' /etc/passwd \| \
	289	while read uid homedir; do
	290	for f in $list ; do
	291	file=${homedir}/${f}
	292	if [ -f $file ] ; then
	293	printf "$uid $f `ls -ldgT $file`\n"
48e0a733	294	fi
e9a107b1 KB	295	done
	296	done \|
	297	awk '$1 != $5 && $5 != "root" \
	298	{ print "user " $1 " " $2 " file is owned by " $5 }
	299	$3 ~ /^-....w/ \
	300	{ print "user " $1 " " $2 " file is group writeable" }
	301	$3 ~ /^-.......w/ \
	302	{ print "user " $1 " " $2 " file is other writeable" }' >> $OUTPUT
	303	if [ -s $OUTPUT ] ; then
	304	printf "\nChecking dot files.\n"
	305	cat $OUTPUT
	306	fi
	307
	308	# Check mailbox ownership and permissions.
	309	ls -l /var/mail \| sed 1d \| \
	310	awk '$3 != $9 \
	311	{ print "user " $9 " mailbox is owned by " $3 }
	312	$1 != "-rw-------" \
	313	{ print "user " $9 " mailbox is " $1 ", group " $4 }' > $OUTPUT
	314	if [ -s $OUTPUT ] ; then
	315	printf "\nChecking mailbox ownership.\n"
	316	cat $OUTPUT
	317	fi
8e55538e	318
07576f30	319	# Check for globally exported file systems.
07576f30 KB	320	awk '{
	321	readonly = 0;
	322	for (i = 2; i <= NF; ++i) {
	323	if ($i ~ /-ro/)
	324	readonly = 1;
	325	else if ($i !~ /^-/)
	326	next;
	327	}
	328	if (readonly)
	329	print "File system " $1 " globally exported, read-only."
	330	else
	331	print "File system " $1 " globally exported, read-write."
e9a107b1 KB	332	}' < /etc/exports > $OUTPUT
	333	if [ -s $OUTPUT ] ; then
	334	printf "\nChecking for globally exported file systems.\n"
	335	cat $OUTPUT
	336	fi
07576f30	337
40835542	338	# Display setuid and device changes.
e9a107b1 KB	339	printf "\nChecking setuid files and devices:\n"
	340	(find / ! -fstype local -a -prune -o \
	341	\( -perm -u+s -o -perm -g+s -o ! -type d -a ! -type f -a ! -type l -a \
	342	! -type s \) \| \
	343	sort \| sed -e 's/^/ls -ldgT /' \| sh > $LIST) 2> $OUTPUT
383148a3	344
40835542	345	# Display any errors that occurred during system file walk.
e9a107b1 KB	346	if [ -s $OUTPUT ] ; then
	347	printf "Setuid/device find errors:\n"
	348	cat $OUTPUT
	349	printf "\n"
383148a3 KB	350	fi
383148a3 KB	351
40835542	352	# Display any changes in the setuid file list.
e9a107b1 KB	353	egrep -v '^[bc]' $LIST > $TMP1
	354
	355	if [ -s $TMP1 ] ; then
	356	# Check to make sure uudecode isn't setuid.
	357	if grep -w uudecode $TMP1 > /dev/null ; then
	358	printf "\nUudecode is setuid.\n"
	359	fi
	360
	361	CUR=/var/backups/setuid.current
	362	BACK=/var/backups/setuid.backup
383148a3	363
40835542	364	if [ -s $CUR ] ; then
e9a107b1	365	if cmp -s $CUR $TMP1 ; then
8e55538e KB	366	:
8e55538e KB	367	else
e9a107b1 KB	368	> $TMP2
	369	join -110 -210 -v2 $CUR $TMP1 > $OUTPUT
	370	if [ -s $OUTPUT ] ; then
	371	printf "Setuid additions:\n"
	372	tee -a $TMP2 < $OUTPUT
	373	printf "\n"
8e55538e KB	374	fi
8e55538e KB	375
e9a107b1 KB	376	join -110 -210 -v1 $CUR $TMP1 > $OUTPUT
	377	if [ -s $OUTPUT ] ; then
	378	printf "Setuid deletions:\n"
	379	tee -a $TMP2 < $OUTPUT
	380	printf "\n"
8e55538e KB	381	fi
8e55538e KB	382
e9a107b1 KB	383	sort +9 $TMP2 $CUR $TMP1 \| \
	384	sed -e 's/[ ][ ]*/ /g' \| uniq -u > $OUTPUT
	385	if [ -s $OUTPUT ] ; then
	386	printf "Setuid changes:\n"
	387	column -t $OUTPUT
	388	printf "\n"
8e55538e KB	389	fi
8e55538e KB	390
e9a107b1 KB	391	cp $CUR $BACK
e9a107b1 KB	392	cp $TMP1 $CUR
8e55538e KB	393	fi
8e55538e KB	394	else
e9a107b1	395	printf "Setuid additions:\n"
d0381ed9	396	column -t $TMP1
e9a107b1 KB	397	printf "\n"
e9a107b1 KB	398	cp $TMP1 $CUR
8e55538e	399	fi
525ea79f	400	fi
525ea79f	401
d0381ed9 KB	402	# Check for block and character disk devices, that are readable or writeable
d0381ed9 KB	403	# or not owned by root.operator.
e9a107b1 KB	404	egrep '^b' $LIST > $TMP1
	405	egrep '^c./rdk[0-9][0-9][a-h]$' $LIST >> $TMP1
	406	egrep '^c./rfd[0-9][0-9][a-h]$' $LIST >> $TMP1
	407	egrep '^c./rhd[0-9][0-9][a-h]$' $LIST >> $TMP1
	408	egrep '^c./rhk[0-9][0-9][a-h]$' $LIST >> $TMP1
	409	egrep '^c./rhp[0-9][0-9][a-h]$' $LIST >> $TMP1
	410	egrep '^c./rjb[0-9][0-9][a-h]$' $LIST >> $TMP1
	411	egrep '^c./rkra[0-9][0-9][a-h]$' $LIST >> $TMP1
	412	egrep '^c./rra[0-9][0-9][a-h]$' $LIST >> $TMP1
	413	egrep '^c./rrb[0-9][0-9][a-h]$' $LIST >> $TMP1
	414	egrep '^c./rrd[0-9][0-9][a-h]$' $LIST >> $TMP1
	415	egrep '^c./rrl[0-9][0-9][a-h]$' $LIST >> $TMP1
	416	egrep '^c./rrx[0-9][0-9][a-h]$' $LIST >> $TMP1
	417	egrep '^c./rrz[0-9][0-9][a-h]$' $LIST >> $TMP1
	418	egrep '^c./rsd[0-9][0-9][a-h]$' $LIST >> $TMP1
	419	egrep '^c./rup[0-9][0-9][a-h]$' $LIST >> $TMP1
	420	egrep '^c./rwd[0-9][0-9][a-h]$' $LIST >> $TMP1
	421
d0381ed9 KB	422	awk '$3 != "root" \|\| $4 != "operator" \|\| $1 !~ /.rw-r-----/ \
	423	{ printf("Disk %s is user %s, group %s, permissions %s.\n", \
	424	$11, $3, $4, $1); }' < $TMP1 > $OUTPUT
e9a107b1 KB	425	if [ -s $OUTPUT ] ; then
	426	printf "\nChecking disk ownership and permissions.\n"
	427	cat $OUTPUT
	428	printf "\n"
	429	fi
	430
d0381ed9	431	egrep '^[bc]' $LIST \| sort +10 > $TMP1
40835542	432	# Display any changes in the device file list.
e9a107b1 KB	433	if [ -s $TMP1 ] ; then
	434	CUR=/var/backups/device.current
	435	BACK=/var/backups/device.backup
40835542 KB	436
40835542 KB	437	if [ -s $CUR ] ; then
e9a107b1	438	if cmp -s $CUR $TMP1 ; then
40835542 KB	439	:
40835542 KB	440	else
e9a107b1 KB	441	> $TMP2
	442	join -111 -211 -v2 $CUR $TMP1 > $OUTPUT
	443	if [ -s $OUTPUT ] ; then
	444	printf "Device additions:\n"
	445	tee -a $TMP2 < $OUTPUT
	446	printf "\n"
40835542 KB	447	fi
40835542 KB	448
e9a107b1 KB	449	join -111 -211 -v1 $CUR $TMP1 > $OUTPUT
	450	if [ -s $OUTPUT ] ; then
	451	printf "Device deletions:\n"
	452	tee -a $TMP2 < $OUTPUT
	453	printf "\n"
40835542 KB	454	fi
40835542 KB	455
d0381ed9 KB	456	# Report any block device change. Ignore character
	457	# devices, only the name is significant.
	458	cat $TMP2 $CUR $TMP1 \| \
	459	sed -e '/^c/d' \| \
	460	sort +10 \| \
e9a107b1	461	sed -e 's/[ ][ ]*/ /g' \| \
d0381ed9	462	uniq -u > $OUTPUT
e9a107b1	463	if [ -s $OUTPUT ] ; then
d0381ed9	464	printf "Block device changes:\n"
e9a107b1 KB	465	column -t $OUTPUT
e9a107b1 KB	466	printf "\n"
40835542 KB	467	fi
40835542 KB	468
e9a107b1 KB	469	cp $CUR $BACK
e9a107b1 KB	470	cp $TMP1 $CUR
40835542 KB	471	fi
40835542 KB	472	else
e9a107b1	473	printf "Device additions:\n"
d0381ed9	474	column -t $TMP1
e9a107b1 KB	475	printf "\n"
e9a107b1 KB	476	cp $TMP1 $CUR
40835542 KB	477	fi
40835542 KB	478	fi
40835542	479
08a2d709 KB	480	# Check special files.
	481	# Check system binaries.
	482	#
fd70cf43 KB	483	# Create the mtree tree specifications using:
fd70cf43 KB	484	#
e9a107b1 KB	485	# mtree -cx -pDIR -kcksum,gid,mode,nlink,size,link,time,uid > DIR.secure
	486	# chown root.wheel DIR.SECURE
	487	# chmod 600 DIR.SECURE
fd70cf43 KB	488	#
	489	# Note, this is not complete protection against Trojan horsed binaries, as
	490	# the hacker can modify the tree specification to match the replaced binary.
	491	# For details on really protecting yourself against modified binaries, see
	492	# the mtree(8) manual page.
e9a107b1	493
fd70cf43	494	if cd /etc/mtree; then
e9a107b1 KB	495	mtree -e -p / -f /etc/mtree/special > $OUTPUT
	496	if [ -s $OUTPUT ] ; then
	497	printf "\nChecking special files and directories.\n"
	498	cat $OUTPUT
	499	fi
	500
	501	> $OUTPUT
fd70cf43 KB	502	for file in *.secure; do
fd70cf43 KB	503	tree=`sed -n -e '3s/.* //p' -e 3q $file`
e9a107b1 KB	504	mtree -f $file -p $tree > $TMP1
	505	if [ -s $TMP1 ]; then
	506	printf "\nChecking $tree:\n" >> $OUTPUT
	507	cat $TMP1 >> $OUTPUT
	508	fi
fd70cf43	509	done
e9a107b1 KB	510	if [ -s $OUTPUT ] ; then
	511	printf "\nChecking system binaries:\n"
	512	cat $OUTPUT
	513	fi
fd70cf43	514	fi