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security revision 1.48
      1 #!/bin/sh -
      2 #
      3 #	$NetBSD: security,v 1.48 2001/01/09 17:30:29 abs Exp $
      4 #	from: @(#)security	8.1 (Berkeley) 6/9/93
      5 #
      6 
      7 PATH=/sbin:/usr/sbin:/bin:/usr/bin
      8 
      9 if [ -f /etc/rc.subr ]; then
     10 	. /etc/rc.subr
     11 else
     12 	echo "Can't read /etc/rc.subr; aborting."
     13 	exit 1;
     14 fi
     15 
     16 umask 077
     17 
     18 if [ -s /etc/security.conf ]; then
     19 	. /etc/security.conf
     20 fi
     21 
     22 SECUREDIR=/tmp/_securedir.$$
     23 if ! mkdir $SECUREDIR; then
     24 	echo can not create $SECUREDIR.
     25 	exit 1
     26 fi
     27 
     28 if ! cd $SECUREDIR; then
     29 	echo can not chdir to $SECUREDIR.
     30 	exit 1
     31 fi
     32 
     33 if [ -z "$max_loginlen" ];then
     34     max_loginlen=8
     35 fi
     36 
     37 ERR=secure1.$$
     38 TMP1=secure2.$$
     39 TMP2=secure3.$$
     40 MPBYUID=secure4.$$
     41 MPBYPATH=secure5.$$
     42 LIST=secure6.$$
     43 OUTPUT=secure7.$$
     44 LABELS=secure8.$$
     45 
     46 trap '/bin/rm -rf $SECUREDIR ; exit 0' 0 2 3
     47 
     48 # Handle backup_dir not being set in .conf file
     49 backup_dir=${backup_dir:-/var/backups}
     50 
     51 MP=/etc/master.passwd
     52 
     53 # these is used several times.
     54 awk -F: '!/^+/ { print $1 " " $3 }' $MP | sort -k2n > $MPBYUID
     55 awk -F: '{ print $1 " " $9 }' $MP | sort -k2 > $MPBYPATH
     56 
     57 # Check the master password file syntax.
     58 #
     59 if checkyesno check_passwd; then
     60 	awk -v "len=$max_loginlen" '
     61 	BEGIN {
     62 		while ( getline < "/etc/shells" > 0 ) {
     63 			if ($0 ~ /^\#/ || $0 ~ /^$/ )
     64 				continue;
     65 			shells[$1]++;
     66 		}
     67 		FS=":";
     68 	}
     69 
     70 	{
     71 		if ($0 ~ /^[	 ]*$/) {
     72 			printf "Line %d is a blank line.\n", NR;
     73 			next;
     74 		}
     75 		if (NF != 10 && ($1 != "+" || NF != 1))
     76 			printf "Line %d has the wrong number of fields.\n", NR;
     77 		if ($1 == "+" )  {
     78 			if (NF != 1 && $3 == 0)
     79 			    printf "Line %d includes entries with uid 0.\n", NR;
     80 			next;
     81 		}
     82 		if ($1 !~ /^[A-Za-z0-9]*$/)
     83 			printf "Login %s has non-alphanumeric characters.\n",
     84 			    $1;
     85 		if (length($1) > len)
     86 			printf "Login %s has more than "len" characters.\n", $1;
     87 		if ($2 == "")
     88 			printf "Login %s has no password.\n", $1;
     89 		if (length($2) != 13 && length($2) != 20 && $2 != "") {
     90 			if ($10 == "" || shells[$10])
     91 		    printf "Login %s is off but still has a valid shell (%s)\n",
     92 				    $1, $10;
     93 		} else if (! shells[$10])
     94 			printf "Login %s does not have a valid shell (%s)\n",
     95 			    $1, $10;
     96 		if ($3 == 0 && $1 != "root" && $1 != "toor")
     97 			printf "Login %s has a user id of 0.\n", $1;
     98 		if ($3 < 0)
     99 			printf "Login %s has a negative user id.\n", $1;
    100 		if ($4 < 0)
    101 			printf "Login %s has a negative group id.\n", $1;
    102 	}' < $MP > $OUTPUT
    103 	if [ -s $OUTPUT ] ; then
    104 		printf "\nChecking the $MP file:\n"
    105 		cat $OUTPUT
    106 	fi
    107 
    108 	awk -F: '{ print $1 }' $MP | sort | uniq -d > $OUTPUT
    109 	if [ -s $OUTPUT ] ; then
    110 		printf "\n$MP has duplicate user names.\n"
    111 		column $OUTPUT
    112 	fi
    113 
    114 # To not exclude 'toor', a standard duplicate root account, from the duplicate
    115 # account test, uncomment the line below (without egrep in it)and comment
    116 # out the line (with egrep in it) below it.
    117 #
    118 #	< $MPBYUID uniq -d -f 1 | awk '{ print $2 }' > $TMP2
    119 	< $MPBYUID egrep -v '^toor ' | uniq -d -f 1 | awk '{ print $2 }' > $TMP2
    120 	if [ -s $TMP2 ] ; then
    121 		printf "\n$MP has duplicate user id's.\n"
    122 		while read uid; do
    123 			grep -w $uid $MPBYUID
    124 		done < $TMP2 | column
    125 	fi
    126 fi
    127 
    128 # Backup the master password file; a special case, the normal backup
    129 # mechanisms also print out file differences and we don't want to do
    130 # that because this file has encrypted passwords in it.
    131 #
    132 CUR=$backup_dir/${MP##*/}.current
    133 BACK=$backup_dir/${MP##*/}.backup
    134 if [ -s $CUR ] ; then
    135 	if cmp -s $CUR $MP; then
    136 		:
    137 	else
    138 		cp -p $CUR $BACK
    139 		cp -p $MP $CUR
    140 		chown root:wheel $CUR
    141 	fi
    142 else
    143 	cp -p $MP $CUR
    144 	chown root:wheel $CUR
    145 fi
    146 
    147 # Check the group file syntax.
    148 #
    149 if checkyesno check_group; then
    150 	GRP=/etc/group
    151 	awk -F: '{
    152 		if ($0 ~ /^[	 ]*$/) {
    153 			printf "Line %d is a blank line.\n", NR;
    154 			next;
    155 		}
    156 		if (NF != 4 && ($1 != "+" || NF != 1))
    157 			printf "Line %d has the wrong number of fields.\n", NR;
    158 		if ($1 == "+" )  {
    159 			next;
    160 		}
    161 		if ($1 !~ /^[A-za-z0-9]*$/)
    162 			printf "Group %s has non-alphanumeric characters.\n",
    163 			    $1;
    164 		if (length($1) > 8)
    165 			printf "Group %s has more than 8 characters.\n", $1;
    166 		if ($3 !~ /[0-9]*/)
    167 			printf "Login %s has a negative group id.\n", $1;
    168 	}' < $GRP > $OUTPUT
    169 	if [ -s $OUTPUT ] ; then
    170 		printf "\nChecking the $GRP file:\n"
    171 		cat $OUTPUT
    172 	fi
    173 
    174 	awk -F: '{ print $1 }' $GRP | sort | uniq -d > $OUTPUT
    175 	if [ -s $OUTPUT ] ; then
    176 		printf "\n$GRP has duplicate group names.\n"
    177 		column $OUTPUT
    178 	fi
    179 fi
    180 
    181 # Check for root paths, umask values in startup files.
    182 # The check for the root paths is problematical -- it's likely to fail
    183 # in other environments.  Once the shells have been modified to warn
    184 # of '.' in the path, the path tests should go away.
    185 #
    186 if checkyesno check_rootdotfiles; then
    187 	> $OUTPUT
    188 	rhome=`csh -fc "echo ~root"`
    189 	umaskset=no
    190 	list="/etc/csh.cshrc /etc/csh.login ${rhome}/.cshrc ${rhome}/.login"
    191 	for i in $list ; do
    192 		if [ -f $i ] ; then
    193 			if egrep '^[ \t]*umask[ \t]+[0-7]+' $i > /dev/null ; then
    194 				umaskset=yes
    195 			fi
    196 			# double check the umask value itself; ensure that both the
    197 			# 020 and 002 bits are set.
    198 			# we handle this in decimal initially to extract the digits,
    199 			# and then extract the `2' bit of each digit.
    200 			# this is made especially painful because 
    201 			# bitwise operations were left out of awk.
    202 			egrep '^[ \t]*umask[ \t]+[0-7]+' $i |
    203 			awk '{ g= ($2 % 100) - ($2 % 10);
    204 			       g /= 10;
    205 			       g = g % 4;
    206 			       g -= g % 2;
    207 			       if (g != 2) { print "\tRoot umask is group writeable" }
    208 			       o = ($2 % 10);
    209 			       o = o % 4;
    210 			       o -= o % 2;
    211 			       if (o != 2) { print "\tRoot umask is other writeable" } }' |
    212 			    sort -u >> $OUTPUT
    213 			SAVE_PATH=$PATH
    214 			unset PATH
    215 			/bin/csh -f -s << end-of-csh > /dev/null 2>&1
    216 				source $i
    217 				/bin/ls -ldgT \$path > $TMP1
    218 end-of-csh
    219 			PATH=$SAVE_PATH
    220 			awk '{
    221 				if ($10 ~ /^\.$/) {
    222 					print "\tThe root path includes .";
    223 					next;
    224 				}
    225 			     }
    226 			     $1 ~ /^d....w/ \
    227 		{ print "\tRoot path directory " $10 " is group writeable." } \
    228 			     $1 ~ /^d.......w/ \
    229 		{ print "\tRoot path directory " $10 " is other writeable." }' \
    230 			< $TMP1 >> $OUTPUT
    231 		fi
    232 	done
    233 	if [ $umaskset = "no" -o -s $OUTPUT ] ; then
    234 		printf "\nChecking root csh paths, umask values:\n$list\n\n"
    235 		if [ -s $OUTPUT ]; then
    236 			cat $OUTPUT
    237 		fi
    238 		if [ $umaskset = "no" ] ; then
    239 		    printf "\tRoot csh startup files do not set the umask.\n"
    240 		fi
    241 	fi
    242 
    243 	> $OUTPUT
    244 	rhome=/root
    245 	umaskset=no
    246 	list="/etc/profile ${rhome}/.profile"
    247 	for i in $list; do
    248 		if [ -f $i ] ; then
    249 			if egrep umask $i > /dev/null ; then
    250 				umaskset=yes
    251 			fi
    252 			egrep umask $i |
    253 			awk '$2 % 100 < 20 \
    254 				{ print "\tRoot umask is group writeable" } \
    255 			     $2 % 10 < 2 \
    256 				{ print "\tRoot umask is other writeable" }' \
    257 			    >> $OUTPUT
    258 			SAVE_PATH=$PATH
    259 			unset PATH
    260 			/bin/sh << end-of-sh > /dev/null 2>&1
    261 				. $i
    262 				list=\`echo \$PATH | /usr/bin/sed -e \
    263 				    's/^:/.:/;s/:$/:./;s/::/:.:/g;s/:/ /g'\`
    264 				/bin/ls -ldgT \$list > $TMP1
    265 end-of-sh
    266 			PATH=$SAVE_PATH
    267 			awk '{
    268 				if ($10 ~ /^\.$/) {
    269 					print "\tThe root path includes .";
    270 					next;
    271 				}
    272 			     }
    273 			     $1 ~ /^d....w/ \
    274 		{ print "\tRoot path directory " $10 " is group writeable." } \
    275 			     $1 ~ /^d.......w/ \
    276 		{ print "\tRoot path directory " $10 " is other writeable." }' \
    277 			< $TMP1 >> $OUTPUT
    278 
    279 		fi
    280 	done
    281 	if [ $umaskset = "no" -o -s $OUTPUT ] ; then
    282 		printf "\nChecking root sh paths, umask values:\n$list\n"
    283 		if [ -s $OUTPUT ]; then
    284 			cat $OUTPUT
    285 		fi
    286 		if [ $umaskset = "no" ] ; then
    287 			printf "\tRoot sh startup files do not set the umask.\n"
    288 		fi
    289 	fi
    290 fi
    291 
    292 # Root and uucp should both be in /etc/ftpusers.
    293 #
    294 if checkyesno check_ftpusers; then
    295 	> $OUTPUT
    296 	list="uucp "`awk '$2 == 0 { print $1 }' $MPBYUID`
    297 	for i in $list; do
    298 		if /usr/libexec/ftpd -C $i ; then
    299 			printf "\t$i is not denied\n" >> $OUTPUT
    300 		fi
    301 	done
    302 	if [ -s $OUTPUT ]; then
    303 		printf "\nChecking the /etc/ftpusers configuration:\n"
    304 		cat $OUTPUT
    305 	fi
    306 fi
    307 
    308 # Uudecode should not be in the /etc/mail/aliases file.
    309 #
    310 if checkyesno check_aliases; then
    311 	for f in /etc/mail/aliases /etc/aliases; do
    312 		if [ -f $f ] && egrep '^[^#]*(uudecode|decode).*\|' $f; then
    313 			printf "\nEntry for uudecode in $f file.\n"
    314 		fi
    315 	done
    316 fi
    317 
    318 # Files that should not have + signs.
    319 #
    320 if checkyesno check_rhosts; then
    321 	list="/etc/hosts.equiv /etc/hosts.lpd"
    322 	for f in $list ; do
    323 		if [ -f $f ] && egrep '\+' $f > /dev/null ; then
    324 			printf "\nPlus sign in $f file.\n"
    325 		fi
    326 	done
    327 
    328 	# Check for special users with .rhosts files.  Only root and toor should
    329 	# have .rhosts files.  Also, .rhosts files should not have plus signs.
    330 	awk -F: '$1 != "root" && $1 != "toor" && \
    331 		($3 < 100 || $1 == "ftp" || $1 == "uucp") \
    332 			{ print $1 " " $9 }' $MP |
    333 	sort -k2 |
    334 	while read uid homedir; do
    335 		if [ -f ${homedir}/.rhosts ] ; then
    336 			rhost=`ls -ldgT ${homedir}/.rhosts`
    337 			printf -- "$uid: $rhost\n"
    338 		fi
    339 	done > $OUTPUT
    340 	if [ -s $OUTPUT ] ; then
    341 		printf "\nChecking for special users with .rhosts files.\n"
    342 		cat $OUTPUT
    343 	fi
    344 
    345 	while read uid homedir; do
    346 		if [ -f ${homedir}/.rhosts -a -r ${homedir}/.rhosts ] && \
    347 		    cat -f ${homedir}/.rhosts | egrep '\+' > /dev/null ; then
    348 			printf -- "$uid: + in .rhosts file.\n"
    349 		fi
    350 	done < $MPBYPATH > $OUTPUT
    351 	if [ -s $OUTPUT ] ; then
    352 		printf "\nChecking .rhosts files syntax.\n"
    353 		cat $OUTPUT
    354 	fi
    355 fi
    356 
    357 # Check home directories.  Directories should not be owned by someone else
    358 # or writeable.
    359 #
    360 if checkyesno check_homes; then
    361 	while read uid homedir; do
    362 		if [ -d ${homedir}/ ] ; then
    363 			file=`ls -ldgT ${homedir}`
    364 			printf -- "$uid $file\n"
    365 		fi
    366 	done < $MPBYPATH |
    367 	awk '$1 != $4 && $4 != "root" \
    368 		{ print "user " $1 " home directory is owned by " $4 }
    369 	     $2 ~ /^-....w/ \
    370 		{ print "user " $1 " home directory is group writeable" }
    371 	     $2 ~ /^-.......w/ \
    372 		{ print "user " $1 " home directory is other writeable" }' \
    373 	    > $OUTPUT
    374 	if [ -s $OUTPUT ] ; then
    375 		printf "\nChecking home directories.\n"
    376 		cat $OUTPUT
    377 	fi
    378 
    379 	# Files that should not be owned by someone else or readable.
    380 	list=".Xauthority .netrc"
    381 	while read uid homedir; do
    382 		for f in $list ; do
    383 			file=${homedir}/${f}
    384 			if [ -f $file ] ; then
    385 				printf -- "$uid $f `ls -ldgT $file`\n"
    386 			fi
    387 		done
    388 	done < $MPBYPATH |
    389 	awk '$1 != $5 && $5 != "root" \
    390 		{ print "user " $1 " " $2 " file is owned by " $5 }
    391 	     $3 ~ /^-...r/ \
    392 		{ print "user " $1 " " $2 " file is group readable" }
    393 	     $3 ~ /^-......r/ \
    394 		{ print "user " $1 " " $2 " file is other readable" }
    395 	     $3 ~ /^-....w/ \
    396 		{ print "user " $1 " " $2 " file is group writeable" }
    397 	     $3 ~ /^-.......w/ \
    398 		{ print "user " $1 " " $2 " file is other writeable" }' \
    399 	    > $OUTPUT
    400 
    401 	# Files that should not be owned by someone else or writeable.
    402 	list=".bash_history .bash_login .bash_logout .bash_profile .bashrc \
    403 	      .cshrc .emacs .exrc .forward .history .klogin .login .logout \
    404 	      .profile .qmail .rc_history .rhosts .tcshrc .twmrc .xinitrc \
    405 	      .xsession"
    406 	while read uid homedir; do
    407 		for f in $list ; do
    408 			file=${homedir}/${f}
    409 			if [ -f $file ] ; then
    410 				printf -- "$uid $f `ls -ldgT $file`\n"
    411 			fi
    412 		done
    413 	done < $MPBYPATH |
    414 	awk '$1 != $5 && $5 != "root" \
    415 		{ print "user " $1 " " $2 " file is owned by " $5 }
    416 	     $3 ~ /^-....w/ \
    417 		{ print "user " $1 " " $2 " file is group writeable" }
    418 	     $3 ~ /^-.......w/ \
    419 		{ print "user " $1 " " $2 " file is other writeable" }' \
    420 	    >> $OUTPUT
    421 	if [ -s $OUTPUT ] ; then
    422 		printf "\nChecking dot files.\n"
    423 		cat $OUTPUT
    424 	fi
    425 fi
    426 
    427 # Mailboxes should be owned by user and unreadable.
    428 #
    429 if checkyesno check_varmail; then
    430 	ls -l /var/mail | sed 1d | \
    431 	awk '$3 != $9 \
    432 		{ print "user " $9 " mailbox is owned by " $3 }
    433 	     $1 != "-rw-------" \
    434 		{ print "user " $9 " mailbox is " $1 ", group " $4 }' > $OUTPUT
    435 	if [ -s $OUTPUT ] ; then
    436 		printf "\nChecking mailbox ownership.\n"
    437 		cat $OUTPUT
    438 	fi
    439 fi
    440 
    441 # NFS exports shouldn't be globally exported
    442 #
    443 if checkyesno check_nfs && [ -f /etc/exports ]; then
    444 	awk '{
    445 		# ignore comments and blank lines
    446 		if ($0 ~ /^\#/ || $0 ~ /^$/ )
    447 			next;
    448 
    449 		readonly = 0;
    450 		for (i = 2; i <= NF; ++i) {
    451 			if ($i ~ /-ro/)
    452 				readonly = 1;
    453 			else if ($i !~ /^-/)
    454 				next;
    455 		}
    456 		if (readonly)
    457 			print "File system " $1 " globally exported, read-only."
    458 		else
    459 			print "File system " $1 " globally exported, read-write."
    460 	}' < /etc/exports > $OUTPUT
    461 	if [ -s $OUTPUT ] ; then
    462 		printf "\nChecking for globally exported file systems.\n"
    463 		cat $OUTPUT
    464 	fi
    465 fi
    466 
    467 # Display any changes in setuid files and devices.
    468 #
    469 if checkyesno check_devices; then
    470 	> $ERR
    471 	(find / \( ! -fstype local -o -fstype fdesc -o -fstype kernfs \
    472 			-o -fstype procfs \) -a -prune -o \
    473 	    \( \( -perm -u+s -a ! -type d \) -o \
    474 	       \( -perm -g+s -a ! -type d \) -o \
    475 	       -type b -o -type c \) -print0 | \
    476 	xargs -0 ls -ldgTq | sort +9 > $LIST) 2> $OUTPUT
    477 
    478 	# Display any errors that occurred during system file walk.
    479 	if [ -s $OUTPUT ] ; then
    480 		printf "Setuid/device find errors:\n" >> $ERR
    481 		cat $OUTPUT >> $ERR
    482 		printf "\n" >> $ERR
    483 	fi
    484 
    485 	# Display any changes in the setuid file list.
    486 	egrep -v '^[bc]' $LIST > $TMP1
    487 	if [ -s $TMP1 ] ; then
    488 		# Check to make sure uudecode isn't setuid.
    489 		if grep -w uudecode $TMP1 > /dev/null ; then
    490 			printf "\nUudecode is setuid.\n" >> $ERR
    491 		fi
    492 
    493 		CUR=$backup_dir/setuid.current
    494 		BACK=$backup_dir/setuid.backup
    495 
    496 		if [ -s $CUR ] ; then
    497 			if cmp -s $CUR $TMP1 ; then
    498 				:
    499 			else
    500 				> $TMP2
    501 				join -110 -210 -v2 $CUR $TMP1 > $OUTPUT
    502 				if [ -s $OUTPUT ] ; then
    503 					printf "Setuid additions:\n" >> $ERR
    504 					tee -a $TMP2 < $OUTPUT >> $ERR
    505 					printf "\n" >> $ERR
    506 				fi
    507 
    508 				join -110 -210 -v1 $CUR $TMP1 > $OUTPUT
    509 				if [ -s $OUTPUT ] ; then
    510 					printf "Setuid deletions:\n" >> $ERR
    511 					tee -a $TMP2 < $OUTPUT >> $ERR
    512 					printf "\n" >> $ERR
    513 				fi
    514 
    515 				sort -k10 $TMP2 $CUR $TMP1 | \
    516 				    sed -e 's/[	 ][	 ]*/ /g' | \
    517 				    uniq -u > $OUTPUT
    518 				if [ -s $OUTPUT ] ; then
    519 					printf "Setuid changes:\n" >> $ERR
    520 					column -t $OUTPUT >> $ERR
    521 					printf "\n" >> $ERR
    522 				fi
    523 
    524 				cp $CUR $BACK
    525 				cp $TMP1 $CUR
    526 			fi
    527 		else
    528 			printf "Setuid additions:\n" >> $ERR
    529 			column -t $TMP1 >> $ERR
    530 			printf "\n" >> $ERR
    531 			cp $TMP1 $CUR
    532 		fi
    533 	fi
    534 
    535 	# Check for block and character disk devices that are readable or
    536 	# writeable or not owned by root.operator.
    537 	>$TMP1
    538 	DISKLIST="acd ccd cd ch fd hk hp mcd md ra rb rd rl rx rz \
    539 	    sd se ss tz uk up vnd wd xd xy"
    540 #	DISKLIST="$DISKLIST ct mt st wt"
    541 	for i in $DISKLIST; do
    542 		egrep "^b.*/${i}[0-9][0-9]*[a-p]$"  $LIST >> $TMP1
    543 		egrep "^c.*/r${i}[0-9][0-9]*[a-p]$"  $LIST >> $TMP1
    544 	done
    545 
    546 	awk '$3 != "root" || $4 != "operator" || $1 !~ /.rw-r-----/ \
    547 		{ printf "Disk %s is user %s, group %s, permissions %s.\n", \
    548 		    $11, $3, $4, $1; }' < $TMP1 > $OUTPUT
    549 	if [ -s $OUTPUT ] ; then
    550 		printf "\nChecking disk ownership and permissions.\n" >> $ERR
    551 		cat $OUTPUT >> $ERR
    552 		printf "\n" >> $ERR
    553 	fi
    554 
    555 	# Display any changes in the device file list.
    556 	egrep '^[bc]' $LIST | sort -k11 > $TMP1
    557 	if [ -s $TMP1 ] ; then
    558 		CUR=$backup_dir/device.current
    559 		BACK=$backup_dir/device.backup
    560 
    561 		if [ -s $CUR ] ; then
    562 			if cmp -s $CUR $TMP1 ; then
    563 				:
    564 			else
    565 				> $TMP2
    566 				join -111 -211 -v2 $CUR $TMP1 > $OUTPUT
    567 				if [ -s $OUTPUT ] ; then
    568 					printf "Device additions:\n" >> $ERR
    569 					tee -a $TMP2 < $OUTPUT >> $ERR
    570 					printf "\n" >> $ERR
    571 				fi
    572 
    573 				join -111 -211 -v1 $CUR $TMP1 > $OUTPUT
    574 				if [ -s $OUTPUT ] ; then
    575 					printf "Device deletions:\n" >> $ERR
    576 					tee -a $TMP2 < $OUTPUT >> $ERR
    577 					printf "\n" >> $ERR
    578 				fi
    579 
    580 				# Report any block device change. Ignore
    581 				# character devices, only the name is
    582 				# significant.
    583 				cat $TMP2 $CUR $TMP1 | \
    584 				    sed -e '/^c/d' | \
    585 				    sort -k11 | \
    586 				    sed -e 's/[	 ][	 ]*/ /g' | \
    587 				    uniq -u > $OUTPUT
    588 				if [ -s $OUTPUT ] ; then
    589 					printf "Block device changes:\n" >> $ERR
    590 					column -t $OUTPUT >> $ERR
    591 					printf "\n" >> $ERR
    592 				fi
    593 
    594 				cp $CUR $BACK
    595 				cp $TMP1 $CUR
    596 			fi
    597 		else
    598 			printf "Device additions:\n" >> $ERR
    599 			column -t $TMP1 >> $ERR
    600 			printf "\n" >> $ERR
    601 			cp $TMP1 $CUR >> $ERR
    602 		fi
    603 	fi
    604 	if [ -s $ERR ] ; then
    605 		printf "\nChecking setuid files and devices:\n"
    606 		cat $ERR
    607 		printf "\n"
    608 	fi
    609 fi
    610 
    611 # Check special files.
    612 # Check system binaries.
    613 #
    614 # Create the mtree tree specifications using:
    615 #
    616 #	mtree -cx -pDIR -kcksum,gid,mode,nlink,size,link,time,uid > DIR.secure
    617 #	chown root:wheel DIR.secure
    618 #	chmod 600 DIR.secure
    619 #
    620 # Note, this is not complete protection against Trojan horsed binaries, as
    621 # the hacker can modify the tree specification to match the replaced binary.
    622 # For details on really protecting yourself against modified binaries, see
    623 # the mtree(8) manual page.
    624 #
    625 if checkyesno check_mtree; then
    626 	mtree -e -p / -f /etc/mtree/special > $OUTPUT
    627 	if [ -s $OUTPUT ]; then
    628 		printf "\nChecking special files and directories.\n"
    629 		cat $OUTPUT
    630 	fi
    631 
    632 	> $OUTPUT
    633 	for file in /etc/mtree/*.secure; do
    634 		[ $file = '/etc/mtree/*.secure' ] && continue
    635 		tree=`sed -n -e '3s/.* //p' -e 3q $file`
    636 		mtree -f $file -p $tree > $TMP1
    637 		if [ -s $TMP1 ]; then
    638 			printf "\nChecking $tree:\n" >> $OUTPUT
    639 			cat $TMP1 >> $OUTPUT
    640 		fi
    641 	done
    642 	if [ -s $OUTPUT ]; then
    643 		printf "\nChecking system binaries:\n"
    644 		cat $OUTPUT
    645 	fi
    646 fi
    647 
    648 CHANGELIST=""
    649 
    650 # Backup disklabels of available disks
    651 #
    652 if checkyesno check_disklabels; then
    653 		# generate list of old disklabels and remove them
    654 	ls -1d $backup_dir/disklabel.* 2>/dev/null |
    655 	    egrep -v '\.(backup|current)$' > $LABELS
    656 	xargs rm < $LABELS
    657 
    658 	disks=`iostat -x | sed 1d | awk '$1 !~ /^[cfm]d/ { print $1; }'`
    659 	for i in $disks; do
    660 		dlf="$backup_dir/disklabel.$i"
    661 		disklabel $i > $dlf 2>/dev/null
    662 	done
    663 
    664 		# append list of new disklabels, sort list
    665 	ls -1d $backup_dir/disklabel.* 2>/dev/null |
    666 	    egrep -v '\.(backup|current)$' >> $LABELS
    667 	sort -u -o $LABELS $LABELS
    668 	CHANGELIST=$LABELS
    669 fi
    670 
    671 # List of files that get backed up and checked for any modifications.  Each
    672 # file is expected to have two backups, $backup_dir/file.{current,backup}.
    673 # Any changes cause the files to rotate.
    674 #
    675 if checkyesno check_changelist && [ -s /etc/changelist ] ; then
    676 	CHANGELIST="/etc/changelist $CHANGELIST"
    677 fi
    678 
    679 if [ -n "$CHANGELIST" ]; then
    680 	for file in `egrep -hv "^#|$MP" $CHANGELIST`; do
    681 		CUR=$backup_dir/${file##*/}.current
    682 		BACK=$backup_dir/${file##*/}.backup
    683 		if [ -f $file ]; then
    684 			if [ -f $CUR ] ; then
    685 				diff $CUR $file > $OUTPUT
    686 				if [ -s $OUTPUT ] ; then
    687 		printf "\n======\n%s diffs (OLD < > NEW)\n======\n" $file
    688 					cat $OUTPUT
    689 					mv -f $CUR $BACK
    690 					cp -p $file $CUR
    691 					chown root:wheel $CUR
    692 				fi
    693 			else
    694 		printf "\n======\n%s added\n======\n" $file
    695 				diff /dev/null $file
    696 				cp -p $file $CUR
    697 				chown root:wheel $CUR
    698 			fi
    699 		else
    700 			if [ -f $CUR ]; then
    701 		printf "\n======\n%s removed\n======\n" $file
    702 				diff $CUR /dev/null
    703 				mv -f $CUR $BACK
    704 			fi
    705 		fi
    706 	done
    707 fi
    708 
    709 # run skeyaudit to inform users of ready to expire S/Keys
    710 #
    711 if checkyesno run_skeyaudit; then
    712 	skeyaudit
    713 fi
    714 
    715 if [ -f /etc/security.local ]; then
    716 	echo ""
    717 	echo "Running /etc/security.local:"
    718 	. /etc/security.local
    719 fi
    720