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

#!/bin/sh -
#
#	@(#)security	5.28 (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-alphanumeric 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-alphanumeric 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 egrep 'uudecode|decode' /etc/aliases; then
	printf "\nThere is an entry for uudecode in the /etc/aliases file.\n"
fi

# Files that should not have + signs.
list="/etc/hosts.equiv /etc/hosts.lpd"
for f in $list ; do
	if egrep '\+' $f > /dev/null ; then
		printf "\nPlus sign in $f file.\n"
	fi
done

# Check for special users with .rhosts files.  Only root and toor should
# have a .rhosts files.  Also, .rhosts files should not 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: + 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.
>$TMP1
DISKLIST="dk fd hd hk hp jb kra ra rb rd rl rx rz sd up wd"
for i in $DISKLIST; do
	egrep "^b.*/${i}[0-9][0-9]*[a-h]$"  $LIST >> $TMP1
	egrep "^c.*/r${i}[0-9][0-9]*[a-h]$"  $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 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	#
a57f1f3a	3	# @(#)security 5.28 (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 ($1 !~ /^[A-Za-z0-9]*$/)
55f9026c	29	printf("Login %s has non-alphanumeric characters.\n", $1);
e9a107b1 KB	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 ($1 !~ /^[A-za-z0-9]*$/)
55f9026c	91	printf("Group %s has non-alphanumeric characters.\n", $1);
e9a107b1 KB	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.
a57f1f3a	211	if egrep 'uudecode\|decode' /etc/aliases; then
e9a107b1 KB	212	printf "\nThere is an entry for uudecode in the /etc/aliases file.\n"
	213	fi
	214
dc36d8e8	215	# Files that should not have + signs.
5a7c696a KB	216	list="/etc/hosts.equiv /etc/hosts.lpd"
5a7c696a KB	217	for f in $list ; do
dc36d8e8 KB	218	if egrep '\+' $f > /dev/null ; then
dc36d8e8 KB	219	printf "\nPlus sign in $f file.\n"
5a7c696a KB	220	fi
5a7c696a KB	221	done
e9a107b1 KB	222
e9a107b1 KB	223	# Check for special users with .rhosts files. Only root and toor should
dc36d8e8	224	# have a .rhosts files. Also, .rhosts files should not plus signs.
e9a107b1 KB	225	awk -F: '$1 != "root" && $1 != "toor" && \
	226	($3 < 100 \|\| $1 == "ftp" \|\| $1 == "uucp") \
	227	{ print $1 " " $6 }' /etc/passwd \|
	228	while read uid homedir; do
	229	if [ -f ${homedir}/.rhosts ] ; then
	230	rhost=`ls -ldgT ${homedir}/.rhosts`
	231	printf "$uid: $rhost\n"
48e0a733	232	fi
e9a107b1 KB	233	done > $OUTPUT
	234	if [ -s $OUTPUT ] ; then
	235	printf "\nChecking for special users with .rhosts files.\n"
	236	cat $OUTPUT
	237	fi
48e0a733	238
e9a107b1 KB	239	awk -F: '{ print $1 " " $6 }' /etc/passwd \| \
	240	while read uid homedir; do
	241	if [ -f ${homedir}/.rhosts ] && \
dc36d8e8 KB	242	egrep '\+' ${homedir}/.rhosts > /dev/null ; then
dc36d8e8 KB	243	printf "$uid: + in .rhosts file.\n"
e9a107b1 KB	244	fi
	245	done > $OUTPUT
	246	if [ -s $OUTPUT ] ; then
	247	printf "\nChecking .rhosts files syntax.\n"
	248	cat $OUTPUT
	249	fi
48e0a733	250
28225475 KB	251	# Check home directories. Directories should not be owned by someone else
28225475 KB	252	# or writeable.
e9a107b1 KB	253	awk -F: '{ print $1 " " $6 }' /etc/passwd \| \
	254	while read uid homedir; do
	255	if [ -d ${homedir}/ ] ; then
	256	file=`ls -ldgT ${homedir}`
	257	printf "$uid $file\n"
	258	fi
	259	done \|
	260	awk '$1 != $4 && $4 != "root" \
	261	{ print "user " $1 " home directory is owned by " $4 }
	262	$2 ~ /^-....w/ \
	263	{ print "user " $1 " home directory is group writeable" }
	264	$2 ~ /^-.......w/ \
	265	{ print "user " $1 " home directory is other writeable" }' > $OUTPUT
	266	if [ -s $OUTPUT ] ; then
	267	printf "\nChecking home directories.\n"
	268	cat $OUTPUT
	269	fi
48e0a733	270
e9a107b1 KB	271	# Files that should not be owned by someone else or readable.
	272	list=".netrc .rhosts"
	273	awk -F: '{ print $1 " " $6 }' /etc/passwd \| \
	274	while read uid homedir; do
	275	for f in $list ; do
	276	file=${homedir}/${f}
	277	if [ -f $file ] ; then
	278	printf "$uid $f `ls -ldgT $file`\n"
48e0a733	279	fi
e9a107b1 KB	280	done
	281	done \|
	282	awk '$1 != $5 && $5 != "root" \
	283	{ print "user " $1 " " $2 " file is owned by " $5 }
	284	$3 ~ /^-...r/ \
	285	{ print "user " $1 " " $2 " file is group readable" }
	286	$3 ~ /^-......r/ \
	287	{ print "user " $1 " " $2 " file is other readable" }
	288	$3 ~ /^-....w/ \
	289	{ print "user " $1 " " $2 " file is group writeable" }
	290	$3 ~ /^-.......w/ \
	291	{ print "user " $1 " " $2 " file is other writeable" }' > $OUTPUT
48e0a733	292
e9a107b1 KB	293	# Files that should not be owned by someone else or writeable.
	294	list=".bashrc .cshrc .emacsrc .exrc .forward .klogin .login .logout \
	295	.profile .tcshrc"
	296	awk -F: '{ print $1 " " $6 }' /etc/passwd \| \
	297	while read uid homedir; do
	298	for f in $list ; do
	299	file=${homedir}/${f}
	300	if [ -f $file ] ; then
	301	printf "$uid $f `ls -ldgT $file`\n"
48e0a733	302	fi
e9a107b1 KB	303	done
	304	done \|
	305	awk '$1 != $5 && $5 != "root" \
	306	{ print "user " $1 " " $2 " file is owned by " $5 }
	307	$3 ~ /^-....w/ \
	308	{ print "user " $1 " " $2 " file is group writeable" }
	309	$3 ~ /^-.......w/ \
	310	{ print "user " $1 " " $2 " file is other writeable" }' >> $OUTPUT
	311	if [ -s $OUTPUT ] ; then
	312	printf "\nChecking dot files.\n"
	313	cat $OUTPUT
	314	fi
	315
28225475	316	# Mailboxes should be owned by user and unreadable.
e9a107b1 KB	317	ls -l /var/mail \| sed 1d \| \
	318	awk '$3 != $9 \
	319	{ print "user " $9 " mailbox is owned by " $3 }
	320	$1 != "-rw-------" \
	321	{ print "user " $9 " mailbox is " $1 ", group " $4 }' > $OUTPUT
	322	if [ -s $OUTPUT ] ; then
	323	printf "\nChecking mailbox ownership.\n"
	324	cat $OUTPUT
	325	fi
8e55538e	326
28225475	327	# File systems should not be globally exported.
07576f30 KB	328	awk '{
	329	readonly = 0;
	330	for (i = 2; i <= NF; ++i) {
	331	if ($i ~ /-ro/)
	332	readonly = 1;
	333	else if ($i !~ /^-/)
	334	next;
	335	}
	336	if (readonly)
	337	print "File system " $1 " globally exported, read-only."
	338	else
	339	print "File system " $1 " globally exported, read-write."
e9a107b1 KB	340	}' < /etc/exports > $OUTPUT
	341	if [ -s $OUTPUT ] ; then
	342	printf "\nChecking for globally exported file systems.\n"
	343	cat $OUTPUT
	344	fi
07576f30	345
28225475	346	# Display any changes in setuid files and devices.
e9a107b1 KB	347	printf "\nChecking setuid files and devices:\n"
	348	(find / ! -fstype local -a -prune -o \
	349	\( -perm -u+s -o -perm -g+s -o ! -type d -a ! -type f -a ! -type l -a \
	350	! -type s \) \| \
	351	sort \| sed -e 's/^/ls -ldgT /' \| sh > $LIST) 2> $OUTPUT
383148a3	352
40835542	353	# Display any errors that occurred during system file walk.
e9a107b1 KB	354	if [ -s $OUTPUT ] ; then
	355	printf "Setuid/device find errors:\n"
	356	cat $OUTPUT
	357	printf "\n"
383148a3 KB	358	fi
383148a3 KB	359
40835542	360	# Display any changes in the setuid file list.
e9a107b1	361	egrep -v '^[bc]' $LIST > $TMP1
e9a107b1 KB	362	if [ -s $TMP1 ] ; then
	363	# Check to make sure uudecode isn't setuid.
	364	if grep -w uudecode $TMP1 > /dev/null ; then
	365	printf "\nUudecode is setuid.\n"
	366	fi
	367
	368	CUR=/var/backups/setuid.current
	369	BACK=/var/backups/setuid.backup
383148a3	370
40835542	371	if [ -s $CUR ] ; then
e9a107b1	372	if cmp -s $CUR $TMP1 ; then
8e55538e KB	373	:
8e55538e KB	374	else
e9a107b1 KB	375	> $TMP2
	376	join -110 -210 -v2 $CUR $TMP1 > $OUTPUT
	377	if [ -s $OUTPUT ] ; then
	378	printf "Setuid additions:\n"
	379	tee -a $TMP2 < $OUTPUT
	380	printf "\n"
8e55538e KB	381	fi
8e55538e KB	382
e9a107b1 KB	383	join -110 -210 -v1 $CUR $TMP1 > $OUTPUT
	384	if [ -s $OUTPUT ] ; then
	385	printf "Setuid deletions:\n"
	386	tee -a $TMP2 < $OUTPUT
	387	printf "\n"
8e55538e KB	388	fi
8e55538e KB	389
e9a107b1 KB	390	sort +9 $TMP2 $CUR $TMP1 \| \
	391	sed -e 's/[ ][ ]*/ /g' \| uniq -u > $OUTPUT
	392	if [ -s $OUTPUT ] ; then
	393	printf "Setuid changes:\n"
	394	column -t $OUTPUT
	395	printf "\n"
8e55538e KB	396	fi
8e55538e KB	397
e9a107b1 KB	398	cp $CUR $BACK
e9a107b1 KB	399	cp $TMP1 $CUR
8e55538e KB	400	fi
8e55538e KB	401	else
e9a107b1	402	printf "Setuid additions:\n"
d0381ed9	403	column -t $TMP1
e9a107b1 KB	404	printf "\n"
e9a107b1 KB	405	cp $TMP1 $CUR
8e55538e	406	fi
525ea79f	407	fi
525ea79f	408
28225475	409	# Check for block and character disk devices that are readable or writeable
d0381ed9	410	# or not owned by root.operator.
024870f9 KB	411	>$TMP1
	412	DISKLIST="dk fd hd hk hp jb kra ra rb rd rl rx rz sd up wd"
	413	for i in $DISKLIST; do
	414	egrep "^b./${i}[0-9][0-9][a-h]$" $LIST >> $TMP1
	415	egrep "^c./r${i}[0-9][0-9][a-h]$" $LIST >> $TMP1
	416	done
e9a107b1	417
d0381ed9 KB	418	awk '$3 != "root" \|\| $4 != "operator" \|\| $1 !~ /.rw-r-----/ \
	419	{ printf("Disk %s is user %s, group %s, permissions %s.\n", \
	420	$11, $3, $4, $1); }' < $TMP1 > $OUTPUT
e9a107b1 KB	421	if [ -s $OUTPUT ] ; then
	422	printf "\nChecking disk ownership and permissions.\n"
	423	cat $OUTPUT
	424	printf "\n"
	425	fi
	426
40835542	427	# Display any changes in the device file list.
28225475	428	egrep '^[bc]' $LIST \| sort +10 > $TMP1
e9a107b1 KB	429	if [ -s $TMP1 ] ; then
	430	CUR=/var/backups/device.current
	431	BACK=/var/backups/device.backup
40835542 KB	432
40835542 KB	433	if [ -s $CUR ] ; then
e9a107b1	434	if cmp -s $CUR $TMP1 ; then
40835542 KB	435	:
40835542 KB	436	else
e9a107b1 KB	437	> $TMP2
	438	join -111 -211 -v2 $CUR $TMP1 > $OUTPUT
	439	if [ -s $OUTPUT ] ; then
	440	printf "Device additions:\n"
	441	tee -a $TMP2 < $OUTPUT
	442	printf "\n"
40835542 KB	443	fi
40835542 KB	444
e9a107b1 KB	445	join -111 -211 -v1 $CUR $TMP1 > $OUTPUT
	446	if [ -s $OUTPUT ] ; then
	447	printf "Device deletions:\n"
	448	tee -a $TMP2 < $OUTPUT
	449	printf "\n"
40835542 KB	450	fi
40835542 KB	451
d0381ed9 KB	452	# Report any block device change. Ignore character
	453	# devices, only the name is significant.
	454	cat $TMP2 $CUR $TMP1 \| \
	455	sed -e '/^c/d' \| \
	456	sort +10 \| \
e9a107b1	457	sed -e 's/[ ][ ]*/ /g' \| \
d0381ed9	458	uniq -u > $OUTPUT
e9a107b1	459	if [ -s $OUTPUT ] ; then
d0381ed9	460	printf "Block device changes:\n"
e9a107b1 KB	461	column -t $OUTPUT
e9a107b1 KB	462	printf "\n"
40835542 KB	463	fi
40835542 KB	464
e9a107b1 KB	465	cp $CUR $BACK
e9a107b1 KB	466	cp $TMP1 $CUR
40835542 KB	467	fi
40835542 KB	468	else
e9a107b1	469	printf "Device additions:\n"
d0381ed9	470	column -t $TMP1
e9a107b1 KB	471	printf "\n"
e9a107b1 KB	472	cp $TMP1 $CUR
40835542 KB	473	fi
40835542 KB	474	fi
40835542	475
08a2d709 KB	476	# Check special files.
	477	# Check system binaries.
	478	#
fd70cf43 KB	479	# Create the mtree tree specifications using:
fd70cf43 KB	480	#
e9a107b1 KB	481	# mtree -cx -pDIR -kcksum,gid,mode,nlink,size,link,time,uid > DIR.secure
	482	# chown root.wheel DIR.SECURE
	483	# chmod 600 DIR.SECURE
fd70cf43 KB	484	#
	485	# Note, this is not complete protection against Trojan horsed binaries, as
	486	# the hacker can modify the tree specification to match the replaced binary.
	487	# For details on really protecting yourself against modified binaries, see
	488	# the mtree(8) manual page.
fd70cf43	489	if cd /etc/mtree; then
e9a107b1 KB	490	mtree -e -p / -f /etc/mtree/special > $OUTPUT
	491	if [ -s $OUTPUT ] ; then
	492	printf "\nChecking special files and directories.\n"
	493	cat $OUTPUT
	494	fi
	495
	496	> $OUTPUT
fd70cf43 KB	497	for file in *.secure; do
fd70cf43 KB	498	tree=`sed -n -e '3s/.* //p' -e 3q $file`
e9a107b1 KB	499	mtree -f $file -p $tree > $TMP1
	500	if [ -s $TMP1 ]; then
	501	printf "\nChecking $tree:\n" >> $OUTPUT
	502	cat $TMP1 >> $OUTPUT
	503	fi
fd70cf43	504	done
e9a107b1 KB	505	if [ -s $OUTPUT ] ; then
	506	printf "\nChecking system binaries:\n"
	507	cat $OUTPUT
	508	fi
fd70cf43	509	fi
8c93a907 KB	510
	511	# List of files that get backed up and checked for any modifications. Each
	512	# file is expected to have two backups, /var/backups/file.{current,backup}.
	513	# Any changes cause the files to rotate.
	514	if [ -s /etc/changelist ] ; then
	515	for file in `cat /etc/changelist`; do
	516	CUR=/var/backups/`basename $file`.current
	517	BACK=/var/backups/`basename $file`.backup
	518	if [ -s $file ]; then
	519	if [ -s $CUR ] ; then
	520	diff $CUR $file > $OUTPUT
	521	if [ -s $OUTPUT ] ; then
	522	printf "\n======\n%s diffs (OLD < > NEW)\n======\n" $file
	523	cat $OUTPUT
	524	cp -p $CUR $BACK
	525	cp -p $file $CUR
	526	chown root.wheel $CUR $BACK
	527	fi
	528	else
	529	cp -p $file $CUR
	530	chown root.wheel $CUR
	531	fi
	532	fi
	533	done
	534	fi