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security revision 1.50
      1 #!/bin/sh -
      2 #
      3 #	$NetBSD: security,v 1.50 2001/03/12 16:48:13 atatat 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.$$
     23 if ! mkdir $SECUREDIR; then
     24 	echo can not create $SECUREDIR.
     25 	exit 1
     26 fi
     27 
     28 if ! cd $SECUREDIR; then
     29 	echo can not chdir to $SECUREDIR.
     30 	exit 1
     31 fi
     32 
     33 if [ -z "$max_loginlen" ];then
     34     max_loginlen=8
     35 fi
     36 
     37 if [ -z "$max_grouplen" ]; then
     38     max_grouplen=8
     39 fi
     40 
     41 ERR=secure1.$$
     42 TMP1=secure2.$$
     43 TMP2=secure3.$$
     44 MPBYUID=secure4.$$
     45 MPBYPATH=secure5.$$
     46 LIST=secure6.$$
     47 OUTPUT=secure7.$$
     48 LABELS=secure8.$$
     49 
     50 trap '/bin/rm -rf $SECUREDIR ; exit 0' 0 2 3
     51 
     52 # Handle backup_dir not being set in .conf file
     53 backup_dir=${backup_dir:-/var/backups}
     54 
     55 MP=/etc/master.passwd
     56 
     57 # these is used several times.
     58 awk -F: '!/^+/ { print $1 " " $3 }' $MP | sort -k2n > $MPBYUID
     59 awk -F: '{ print $1 " " $9 }' $MP | sort -k2 > $MPBYPATH
     60 
     61 # Check the master password file syntax.
     62 #
     63 if checkyesno check_passwd; then
     64 	awk -v "len=$max_loginlen" '
     65 	BEGIN {
     66 		while ( getline < "/etc/shells" > 0 ) {
     67 			if ($0 ~ /^\#/ || $0 ~ /^$/ )
     68 				continue;
     69 			shells[$1]++;
     70 		}
     71 		FS=":";
     72 	}
     73 
     74 	{
     75 		if ($0 ~ /^[	 ]*$/) {
     76 			printf "Line %d is a blank line.\n", NR;
     77 			next;
     78 		}
     79 		if (NF != 10 && ($1 != "+" || NF != 1))
     80 			printf "Line %d has the wrong number of fields.\n", NR;
     81 		if ($1 == "+" )  {
     82 			if (NF != 1 && $3 == 0)
     83 			    printf "Line %d includes entries with uid 0.\n", NR;
     84 			next;
     85 		}
     86 		if ($1 !~ /^[A-Za-z0-9]*$/)
     87 			printf "Login %s has non-alphanumeric characters.\n",
     88 			    $1;
     89 		if (length($1) > len)
     90 			printf "Login %s has more than "len" characters.\n", $1;
     91 		if ($2 == "")
     92 			printf "Login %s has no password.\n", $1;
     93 		if (length($2) != 13 && length($2) != 20 && length($2) != 34 && $2 != "") {
     94 			if ($10 == "" || shells[$10])
     95 		    printf "Login %s is off but still has a valid shell (%s)\n",
     96 				    $1, $10;
     97 		} else if (! shells[$10])
     98 			printf "Login %s does not have a valid shell (%s)\n",
     99 			    $1, $10;
    100 		if ($3 == 0 && $1 != "root" && $1 != "toor")
    101 			printf "Login %s has a user id of 0.\n", $1;
    102 		if ($3 < 0)
    103 			printf "Login %s has a negative user id.\n", $1;
    104 		if ($4 < 0)
    105 			printf "Login %s has a negative group id.\n", $1;
    106 	}' < $MP > $OUTPUT
    107 	if [ -s $OUTPUT ] ; then
    108 		printf "\nChecking the $MP file:\n"
    109 		cat $OUTPUT
    110 	fi
    111 
    112 	awk -F: '{ print $1 }' $MP | sort | uniq -d > $OUTPUT
    113 	if [ -s $OUTPUT ] ; then
    114 		printf "\n$MP has duplicate user names.\n"
    115 		column $OUTPUT
    116 	fi
    117 
    118 # To not exclude 'toor', a standard duplicate root account, from the duplicate
    119 # account test, uncomment the line below (without egrep in it)and comment
    120 # out the line (with egrep in it) below it.
    121 #
    122 #	< $MPBYUID uniq -d -f 1 | awk '{ print $2 }' > $TMP2
    123 	< $MPBYUID egrep -v '^toor ' | uniq -d -f 1 | awk '{ print $2 }' > $TMP2
    124 	if [ -s $TMP2 ] ; then
    125 		printf "\n$MP has duplicate user id's.\n"
    126 		while read uid; do
    127 			grep -w $uid $MPBYUID
    128 		done < $TMP2 | column
    129 	fi
    130 fi
    131 
    132 # Backup the master password file; a special case, the normal backup
    133 # mechanisms also print out file differences and we don't want to do
    134 # that because this file has encrypted passwords in it.
    135 #
    136 CUR=$backup_dir/${MP##*/}.current
    137 BACK=$backup_dir/${MP##*/}.backup
    138 if [ -s $CUR ] ; then
    139 	if cmp -s $CUR $MP; then
    140 		:
    141 	else
    142 		cp -p $CUR $BACK
    143 		cp -p $MP $CUR
    144 		chown root:wheel $CUR
    145 	fi
    146 else
    147 	cp -p $MP $CUR
    148 	chown root:wheel $CUR
    149 fi
    150 
    151 # Check the group file syntax.
    152 #
    153 if checkyesno check_group; then
    154 	GRP=/etc/group
    155 	awk -F: -v "len=$max_grouplen" '{
    156 		if ($0 ~ /^[	 ]*$/) {
    157 			printf "Line %d is a blank line.\n", NR;
    158 			next;
    159 		}
    160 		if (NF != 4 && ($1 != "+" || NF != 1))
    161 			printf "Line %d has the wrong number of fields.\n", NR;
    162 		if ($1 == "+" )  {
    163 			next;
    164 		}
    165 		if ($1 !~ /^[A-za-z0-9]*$/)
    166 			printf "Group %s has non-alphanumeric characters.\n",
    167 			    $1;
    168 		if (length($1) > len)
    169 			printf "Group %s has more than "len" characters.\n", $1;
    170 		if ($3 !~ /[0-9]*/)
    171 			printf "Login %s has a negative group id.\n", $1;
    172 	}' < $GRP > $OUTPUT
    173 	if [ -s $OUTPUT ] ; then
    174 		printf "\nChecking the $GRP file:\n"
    175 		cat $OUTPUT
    176 	fi
    177 
    178 	awk -F: '{ print $1 }' $GRP | sort | uniq -d > $OUTPUT
    179 	if [ -s $OUTPUT ] ; then
    180 		printf "\n$GRP has duplicate group names.\n"
    181 		column $OUTPUT
    182 	fi
    183 fi
    184 
    185 # Check for root paths, umask values in startup files.
    186 # The check for the root paths is problematical -- it's likely to fail
    187 # in other environments.  Once the shells have been modified to warn
    188 # of '.' in the path, the path tests should go away.
    189 #
    190 if checkyesno check_rootdotfiles; then
    191 	> $OUTPUT
    192 	rhome=`csh -fc "echo ~root"`
    193 	umaskset=no
    194 	list="/etc/csh.cshrc /etc/csh.login ${rhome}/.cshrc ${rhome}/.login"
    195 	for i in $list ; do
    196 		if [ -f $i ] ; then
    197 			if egrep '^[ \t]*umask[ \t]+[0-7]+' $i > /dev/null ; then
    198 				umaskset=yes
    199 			fi
    200 			# double check the umask value itself; ensure that both the
    201 			# 020 and 002 bits are set.
    202 			# we handle this in decimal initially to extract the digits,
    203 			# and then extract the `2' bit of each digit.
    204 			# this is made especially painful because 
    205 			# bitwise operations were left out of awk.
    206 			egrep '^[ \t]*umask[ \t]+[0-7]+' $i |
    207 			awk '{ g= ($2 % 100) - ($2 % 10);
    208 			       g /= 10;
    209 			       g = g % 4;
    210 			       g -= g % 2;
    211 			       if (g != 2) { print "\tRoot umask is group writeable" }
    212 			       o = ($2 % 10);
    213 			       o = o % 4;
    214 			       o -= o % 2;
    215 			       if (o != 2) { print "\tRoot umask is other writeable" } }' |
    216 			    sort -u >> $OUTPUT
    217 			SAVE_PATH=$PATH
    218 			unset PATH
    219 			/bin/csh -f -s << end-of-csh > /dev/null 2>&1
    220 				source $i
    221 				/bin/ls -ldgT \$path > $TMP1
    222 end-of-csh
    223 			PATH=$SAVE_PATH
    224 			awk '{
    225 				if ($10 ~ /^\.$/) {
    226 					print "\tThe root path includes .";
    227 					next;
    228 				}
    229 			     }
    230 			     $1 ~ /^d....w/ \
    231 		{ print "\tRoot path directory " $10 " is group writeable." } \
    232 			     $1 ~ /^d.......w/ \
    233 		{ print "\tRoot path directory " $10 " is other writeable." }' \
    234 			< $TMP1 >> $OUTPUT
    235 		fi
    236 	done
    237 	if [ $umaskset = "no" -o -s $OUTPUT ] ; then
    238 		printf "\nChecking root csh paths, umask values:\n$list\n\n"
    239 		if [ -s $OUTPUT ]; then
    240 			cat $OUTPUT
    241 		fi
    242 		if [ $umaskset = "no" ] ; then
    243 		    printf "\tRoot csh startup files do not set the umask.\n"
    244 		fi
    245 	fi
    246 
    247 	> $OUTPUT
    248 	rhome=/root
    249 	umaskset=no
    250 	list="/etc/profile ${rhome}/.profile"
    251 	for i in $list; do
    252 		if [ -f $i ] ; then
    253 			if egrep umask $i > /dev/null ; then
    254 				umaskset=yes
    255 			fi
    256 			egrep umask $i |
    257 			awk '$2 % 100 < 20 \
    258 				{ print "\tRoot umask is group writeable" } \
    259 			     $2 % 10 < 2 \
    260 				{ print "\tRoot umask is other writeable" }' \
    261 			    >> $OUTPUT
    262 			SAVE_PATH=$PATH
    263 			unset PATH
    264 			/bin/sh << end-of-sh > /dev/null 2>&1
    265 				. $i
    266 				list=\`echo \$PATH | /usr/bin/sed -e \
    267 				    's/^:/.:/;s/:$/:./;s/::/:.:/g;s/:/ /g'\`
    268 				/bin/ls -ldgT \$list > $TMP1
    269 end-of-sh
    270 			PATH=$SAVE_PATH
    271 			awk '{
    272 				if ($10 ~ /^\.$/) {
    273 					print "\tThe root path includes .";
    274 					next;
    275 				}
    276 			     }
    277 			     $1 ~ /^d....w/ \
    278 		{ print "\tRoot path directory " $10 " is group writeable." } \
    279 			     $1 ~ /^d.......w/ \
    280 		{ print "\tRoot path directory " $10 " is other writeable." }' \
    281 			< $TMP1 >> $OUTPUT
    282 
    283 		fi
    284 	done
    285 	if [ $umaskset = "no" -o -s $OUTPUT ] ; then
    286 		printf "\nChecking root sh paths, umask values:\n$list\n"
    287 		if [ -s $OUTPUT ]; then
    288 			cat $OUTPUT
    289 		fi
    290 		if [ $umaskset = "no" ] ; then
    291 			printf "\tRoot sh startup files do not set the umask.\n"
    292 		fi
    293 	fi
    294 fi
    295 
    296 # Root and uucp should both be in /etc/ftpusers.
    297 #
    298 if checkyesno check_ftpusers; then
    299 	> $OUTPUT
    300 	list="uucp "`awk '$2 == 0 { print $1 }' $MPBYUID`
    301 	for i in $list; do
    302 		if /usr/libexec/ftpd -C $i ; then
    303 			printf "\t$i is not denied\n" >> $OUTPUT
    304 		fi
    305 	done
    306 	if [ -s $OUTPUT ]; then
    307 		printf "\nChecking the /etc/ftpusers configuration:\n"
    308 		cat $OUTPUT
    309 	fi
    310 fi
    311 
    312 # Uudecode should not be in the /etc/mail/aliases file.
    313 #
    314 if checkyesno check_aliases; then
    315 	for f in /etc/mail/aliases /etc/aliases; do
    316 		if [ -f $f ] && egrep '^[^#]*(uudecode|decode).*\|' $f; then
    317 			printf "\nEntry for uudecode in $f file.\n"
    318 		fi
    319 	done
    320 fi
    321 
    322 # Files that should not have + signs.
    323 #
    324 if checkyesno check_rhosts; then
    325 	list="/etc/hosts.equiv /etc/hosts.lpd"
    326 	for f in $list ; do
    327 		if [ -f $f ] && egrep '\+' $f > /dev/null ; then
    328 			printf "\nPlus sign in $f file.\n"
    329 		fi
    330 	done
    331 
    332 	# Check for special users with .rhosts files.  Only root and toor should
    333 	# have .rhosts files.  Also, .rhosts files should not have plus signs.
    334 	awk -F: '$1 != "root" && $1 != "toor" && \
    335 		($3 < 100 || $1 == "ftp" || $1 == "uucp") \
    336 			{ print $1 " " $9 }' $MP |
    337 	sort -k2 |
    338 	while read uid homedir; do
    339 		if [ -f ${homedir}/.rhosts ] ; then
    340 			rhost=`ls -ldgT ${homedir}/.rhosts`
    341 			printf -- "$uid: $rhost\n"
    342 		fi
    343 	done > $OUTPUT
    344 	if [ -s $OUTPUT ] ; then
    345 		printf "\nChecking for special users with .rhosts files.\n"
    346 		cat $OUTPUT
    347 	fi
    348 
    349 	while read uid homedir; do
    350 		if [ -f ${homedir}/.rhosts -a -r ${homedir}/.rhosts ] && \
    351 		    cat -f ${homedir}/.rhosts | egrep '\+' > /dev/null ; then
    352 			printf -- "$uid: + in .rhosts file.\n"
    353 		fi
    354 	done < $MPBYPATH > $OUTPUT
    355 	if [ -s $OUTPUT ] ; then
    356 		printf "\nChecking .rhosts files syntax.\n"
    357 		cat $OUTPUT
    358 	fi
    359 fi
    360 
    361 # Check home directories.  Directories should not be owned by someone else
    362 # or writeable.
    363 #
    364 if checkyesno check_homes; then
    365 	while read uid homedir; do
    366 		if [ -d ${homedir}/ ] ; then
    367 			file=`ls -ldgT ${homedir}`
    368 			printf -- "$uid $file\n"
    369 		fi
    370 	done < $MPBYPATH |
    371 	awk '$1 != $4 && $4 != "root" \
    372 		{ print "user " $1 " home directory is owned by " $4 }
    373 	     $2 ~ /^-....w/ \
    374 		{ print "user " $1 " home directory is group writeable" }
    375 	     $2 ~ /^-.......w/ \
    376 		{ print "user " $1 " home directory is other writeable" }' \
    377 	    > $OUTPUT
    378 	if [ -s $OUTPUT ] ; then
    379 		printf "\nChecking home directories.\n"
    380 		cat $OUTPUT
    381 	fi
    382 
    383 	# Files that should not be owned by someone else or readable.
    384 	list=".Xauthority .netrc"
    385 	while read uid homedir; do
    386 		for f in $list ; do
    387 			file=${homedir}/${f}
    388 			if [ -f $file ] ; then
    389 				printf -- "$uid $f `ls -ldgT $file`\n"
    390 			fi
    391 		done
    392 	done < $MPBYPATH |
    393 	awk '$1 != $5 && $5 != "root" \
    394 		{ print "user " $1 " " $2 " file is owned by " $5 }
    395 	     $3 ~ /^-...r/ \
    396 		{ print "user " $1 " " $2 " file is group readable" }
    397 	     $3 ~ /^-......r/ \
    398 		{ print "user " $1 " " $2 " file is other readable" }
    399 	     $3 ~ /^-....w/ \
    400 		{ print "user " $1 " " $2 " file is group writeable" }
    401 	     $3 ~ /^-.......w/ \
    402 		{ print "user " $1 " " $2 " file is other writeable" }' \
    403 	    > $OUTPUT
    404 
    405 	# Files that should not be owned by someone else or writeable.
    406 	list=".bash_history .bash_login .bash_logout .bash_profile .bashrc \
    407 	      .cshrc .emacs .exrc .forward .history .klogin .login .logout \
    408 	      .profile .qmail .rc_history .rhosts .tcshrc .twmrc .xinitrc \
    409 	      .xsession"
    410 	while read uid homedir; do
    411 		for f in $list ; do
    412 			file=${homedir}/${f}
    413 			if [ -f $file ] ; then
    414 				printf -- "$uid $f `ls -ldgT $file`\n"
    415 			fi
    416 		done
    417 	done < $MPBYPATH |
    418 	awk '$1 != $5 && $5 != "root" \
    419 		{ print "user " $1 " " $2 " file is owned by " $5 }
    420 	     $3 ~ /^-....w/ \
    421 		{ print "user " $1 " " $2 " file is group writeable" }
    422 	     $3 ~ /^-.......w/ \
    423 		{ print "user " $1 " " $2 " file is other writeable" }' \
    424 	    >> $OUTPUT
    425 	if [ -s $OUTPUT ] ; then
    426 		printf "\nChecking dot files.\n"
    427 		cat $OUTPUT
    428 	fi
    429 fi
    430 
    431 # Mailboxes should be owned by user and unreadable.
    432 #
    433 if checkyesno check_varmail; then
    434 	ls -l /var/mail | sed 1d | \
    435 	awk '$3 != $9 \
    436 		{ print "user " $9 " mailbox is owned by " $3 }
    437 	     $1 != "-rw-------" \
    438 		{ print "user " $9 " mailbox is " $1 ", group " $4 }' > $OUTPUT
    439 	if [ -s $OUTPUT ] ; then
    440 		printf "\nChecking mailbox ownership.\n"
    441 		cat $OUTPUT
    442 	fi
    443 fi
    444 
    445 # NFS exports shouldn't be globally exported
    446 #
    447 if checkyesno check_nfs && [ -f /etc/exports ]; then
    448 	awk '{
    449 		# ignore comments and blank lines
    450 		if ($0 ~ /^\#/ || $0 ~ /^$/ )
    451 			next;
    452 
    453 		readonly = 0;
    454 		for (i = 2; i <= NF; ++i) {
    455 			if ($i ~ /-ro/)
    456 				readonly = 1;
    457 			else if ($i !~ /^-/)
    458 				next;
    459 		}
    460 		if (readonly)
    461 			print "File system " $1 " globally exported, read-only."
    462 		else
    463 			print "File system " $1 " globally exported, read-write."
    464 	}' < /etc/exports > $OUTPUT
    465 	if [ -s $OUTPUT ] ; then
    466 		printf "\nChecking for globally exported file systems.\n"
    467 		cat $OUTPUT
    468 	fi
    469 fi
    470 
    471 # Display any changes in setuid files and devices.
    472 #
    473 if checkyesno check_devices; then
    474 	> $ERR
    475 	(find / \( ! -fstype local -o -fstype fdesc -o -fstype kernfs \
    476 			-o -fstype procfs \) -a -prune -o \
    477 	    \( \( -perm -u+s -a ! -type d \) -o \
    478 	       \( -perm -g+s -a ! -type d \) -o \
    479 	       -type b -o -type c \) -print0 | \
    480 	xargs -0 ls -ldgTq | sort +9 > $LIST) 2> $OUTPUT
    481 
    482 	# Display any errors that occurred during system file walk.
    483 	if [ -s $OUTPUT ] ; then
    484 		printf "Setuid/device find errors:\n" >> $ERR
    485 		cat $OUTPUT >> $ERR
    486 		printf "\n" >> $ERR
    487 	fi
    488 
    489 	# Display any changes in the setuid file list.
    490 	egrep -v '^[bc]' $LIST > $TMP1
    491 	if [ -s $TMP1 ] ; then
    492 		# Check to make sure uudecode isn't setuid.
    493 		if grep -w uudecode $TMP1 > /dev/null ; then
    494 			printf "\nUudecode is setuid.\n" >> $ERR
    495 		fi
    496 
    497 		CUR=$backup_dir/setuid.current
    498 		BACK=$backup_dir/setuid.backup
    499 
    500 		if [ -s $CUR ] ; then
    501 			if cmp -s $CUR $TMP1 ; then
    502 				:
    503 			else
    504 				> $TMP2
    505 				join -110 -210 -v2 $CUR $TMP1 > $OUTPUT
    506 				if [ -s $OUTPUT ] ; then
    507 					printf "Setuid additions:\n" >> $ERR
    508 					tee -a $TMP2 < $OUTPUT >> $ERR
    509 					printf "\n" >> $ERR
    510 				fi
    511 
    512 				join -110 -210 -v1 $CUR $TMP1 > $OUTPUT
    513 				if [ -s $OUTPUT ] ; then
    514 					printf "Setuid deletions:\n" >> $ERR
    515 					tee -a $TMP2 < $OUTPUT >> $ERR
    516 					printf "\n" >> $ERR
    517 				fi
    518 
    519 				sort -k10 $TMP2 $CUR $TMP1 | \
    520 				    sed -e 's/[	 ][	 ]*/ /g' | \
    521 				    uniq -u > $OUTPUT
    522 				if [ -s $OUTPUT ] ; then
    523 					printf "Setuid changes:\n" >> $ERR
    524 					column -t $OUTPUT >> $ERR
    525 					printf "\n" >> $ERR
    526 				fi
    527 
    528 				cp $CUR $BACK
    529 				cp $TMP1 $CUR
    530 			fi
    531 		else
    532 			printf "Setuid additions:\n" >> $ERR
    533 			column -t $TMP1 >> $ERR
    534 			printf "\n" >> $ERR
    535 			cp $TMP1 $CUR
    536 		fi
    537 	fi
    538 
    539 	# Check for block and character disk devices that are readable or
    540 	# writeable or not owned by root.operator.
    541 	>$TMP1
    542 	DISKLIST="acd ccd cd ch fd hk hp mcd md ra rb rd rl rx rz \
    543 	    sd se ss tz uk up vnd wd xd xy"
    544 #	DISKLIST="$DISKLIST ct mt st wt"
    545 	for i in $DISKLIST; do
    546 		egrep "^b.*/${i}[0-9][0-9]*[a-p]$"  $LIST >> $TMP1
    547 		egrep "^c.*/r${i}[0-9][0-9]*[a-p]$"  $LIST >> $TMP1
    548 	done
    549 
    550 	awk '$3 != "root" || $4 != "operator" || $1 !~ /.rw-r-----/ \
    551 		{ printf "Disk %s is user %s, group %s, permissions %s.\n", \
    552 		    $11, $3, $4, $1; }' < $TMP1 > $OUTPUT
    553 	if [ -s $OUTPUT ] ; then
    554 		printf "\nChecking disk ownership and permissions.\n" >> $ERR
    555 		cat $OUTPUT >> $ERR
    556 		printf "\n" >> $ERR
    557 	fi
    558 
    559 	# Display any changes in the device file list.
    560 	egrep '^[bc]' $LIST | sort -k11 > $TMP1
    561 	if [ -s $TMP1 ] ; then
    562 		CUR=$backup_dir/device.current
    563 		BACK=$backup_dir/device.backup
    564 
    565 		if [ -s $CUR ] ; then
    566 			if cmp -s $CUR $TMP1 ; then
    567 				:
    568 			else
    569 				> $TMP2
    570 				join -111 -211 -v2 $CUR $TMP1 > $OUTPUT
    571 				if [ -s $OUTPUT ] ; then
    572 					printf "Device additions:\n" >> $ERR
    573 					tee -a $TMP2 < $OUTPUT >> $ERR
    574 					printf "\n" >> $ERR
    575 				fi
    576 
    577 				join -111 -211 -v1 $CUR $TMP1 > $OUTPUT
    578 				if [ -s $OUTPUT ] ; then
    579 					printf "Device deletions:\n" >> $ERR
    580 					tee -a $TMP2 < $OUTPUT >> $ERR
    581 					printf "\n" >> $ERR
    582 				fi
    583 
    584 				# Report any block device change. Ignore
    585 				# character devices, only the name is
    586 				# significant.
    587 				cat $TMP2 $CUR $TMP1 | \
    588 				    sed -e '/^c/d' | \
    589 				    sort -k11 | \
    590 				    sed -e 's/[	 ][	 ]*/ /g' | \
    591 				    uniq -u > $OUTPUT
    592 				if [ -s $OUTPUT ] ; then
    593 					printf "Block device changes:\n" >> $ERR
    594 					column -t $OUTPUT >> $ERR
    595 					printf "\n" >> $ERR
    596 				fi
    597 
    598 				cp $CUR $BACK
    599 				cp $TMP1 $CUR
    600 			fi
    601 		else
    602 			printf "Device additions:\n" >> $ERR
    603 			column -t $TMP1 >> $ERR
    604 			printf "\n" >> $ERR
    605 			cp $TMP1 $CUR >> $ERR
    606 		fi
    607 	fi
    608 	if [ -s $ERR ] ; then
    609 		printf "\nChecking setuid files and devices:\n"
    610 		cat $ERR
    611 		printf "\n"
    612 	fi
    613 fi
    614 
    615 # Check special files.
    616 # Check system binaries.
    617 #
    618 # Create the mtree tree specifications using:
    619 #
    620 #	mtree -cx -pDIR -kcksum,gid,mode,nlink,size,link,time,uid > DIR.secure
    621 #	chown root:wheel DIR.secure
    622 #	chmod 600 DIR.secure
    623 #
    624 # Note, this is not complete protection against Trojan horsed binaries, as
    625 # the hacker can modify the tree specification to match the replaced binary.
    626 # For details on really protecting yourself against modified binaries, see
    627 # the mtree(8) manual page.
    628 #
    629 if checkyesno check_mtree; then
    630 	mtree -e -p / -f /etc/mtree/special > $OUTPUT
    631 	if [ -s $OUTPUT ]; then
    632 		printf "\nChecking special files and directories.\n"
    633 		cat $OUTPUT
    634 	fi
    635 
    636 	> $OUTPUT
    637 	for file in /etc/mtree/*.secure; do
    638 		[ $file = '/etc/mtree/*.secure' ] && continue
    639 		tree=`sed -n -e '3s/.* //p' -e 3q $file`
    640 		mtree -f $file -p $tree > $TMP1
    641 		if [ -s $TMP1 ]; then
    642 			printf "\nChecking $tree:\n" >> $OUTPUT
    643 			cat $TMP1 >> $OUTPUT
    644 		fi
    645 	done
    646 	if [ -s $OUTPUT ]; then
    647 		printf "\nChecking system binaries:\n"
    648 		cat $OUTPUT
    649 	fi
    650 fi
    651 
    652 CHANGELIST=""
    653 
    654 # Backup disklabels of available disks
    655 #
    656 if checkyesno check_disklabels; then
    657 		# generate list of old disklabels and remove them
    658 	ls -1d $backup_dir/disklabel.* 2>/dev/null |
    659 	    egrep -v '\.(backup|current)$' > $LABELS
    660 	xargs rm < $LABELS
    661 
    662 	disks=`iostat -x | sed 1d | awk '$1 !~ /^[cfm]d/ { print $1; }'`
    663 	for i in $disks; do
    664 		dlf="$backup_dir/disklabel.$i"
    665 		disklabel $i > $dlf 2>/dev/null
    666 	done
    667 
    668 		# append list of new disklabels, sort list
    669 	ls -1d $backup_dir/disklabel.* 2>/dev/null |
    670 	    egrep -v '\.(backup|current)$' >> $LABELS
    671 	sort -u -o $LABELS $LABELS
    672 	CHANGELIST=$LABELS
    673 fi
    674 
    675 # List of files that get backed up and checked for any modifications.  Each
    676 # file is expected to have two backups, $backup_dir/file.{current,backup}.
    677 # Any changes cause the files to rotate.
    678 #
    679 if checkyesno check_changelist && [ -s /etc/changelist ] ; then
    680 	CHANGELIST="/etc/changelist $CHANGELIST"
    681 fi
    682 
    683 if [ -n "$CHANGELIST" ]; then
    684 	for file in `egrep -hv "^#|$MP" $CHANGELIST`; do
    685 		CUR=$backup_dir/${file##*/}.current
    686 		BACK=$backup_dir/${file##*/}.backup
    687 		if [ -f $file ]; then
    688 			if [ -f $CUR ] ; then
    689 				diff $CUR $file > $OUTPUT
    690 				if [ -s $OUTPUT ] ; then
    691 		printf "\n======\n%s diffs (OLD < > NEW)\n======\n" $file
    692 					cat $OUTPUT
    693 					mv -f $CUR $BACK
    694 					cp -p $file $CUR
    695 					chown root:wheel $CUR
    696 				fi
    697 			else
    698 		printf "\n======\n%s added\n======\n" $file
    699 				diff /dev/null $file
    700 				cp -p $file $CUR
    701 				chown root:wheel $CUR
    702 			fi
    703 		else
    704 			if [ -f $CUR ]; then
    705 		printf "\n======\n%s removed\n======\n" $file
    706 				diff $CUR /dev/null
    707 				mv -f $CUR $BACK
    708 			fi
    709 		fi
    710 	done
    711 fi
    712 
    713 # run skeyaudit to inform users of ready to expire S/Keys
    714 #
    715 if checkyesno run_skeyaudit; then
    716 	skeyaudit
    717 fi
    718 
    719 if [ -f /etc/security.local ]; then
    720 	echo ""
    721 	echo "Running /etc/security.local:"
    722 	. /etc/security.local
    723 fi
    724