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security revision 1.62
      1 #!/bin/sh -
      2 #
      3 #	$NetBSD: security,v 1.62 2001/10/01 02:21:20 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=`mktemp -d /tmp/_securedir.XXXXXX` || exit 1
     23 
     24 trap "/bin/rm -rf $SECUREDIR ; exit 0" EXIT INT QUIT
     25 
     26 if ! cd "$SECUREDIR"; then
     27 	echo "Can not cd to $SECUREDIR".
     28 	exit 1
     29 fi
     30 
     31 if [ -z "$max_loginlen" ];then
     32 	max_loginlen=8
     33 fi
     34 
     35 if [ -z "$max_grouplen" ]; then
     36 	max_grouplen=8
     37 fi
     38 
     39 ERR=secure1.$$
     40 TMP1=secure2.$$
     41 TMP2=secure3.$$
     42 MPBYUID=secure4.$$
     43 MPBYPATH=secure5.$$
     44 LIST=secure6.$$
     45 OUTPUT=secure7.$$
     46 LABELS=secure8.$$
     47 PKGS=secure9.$$
     48 
     49 # Handle backup_dir not being set in .conf file
     50 backup_dir=${backup_dir:-/var/backups}
     51 CHANGELIST=""
     52 pkg_dbdir=${pkg_dbdir:-/var/db/pkg}
     53 
     54 MP=/etc/master.passwd
     55 
     56 # these is used several times.
     57 awk -F: '!/^+/ { print $1 " " $3 }' $MP | sort -k2n > $MPBYUID
     58 awk -F: '{ print $1 " " $9 }' $MP | sort -k2 > $MPBYPATH
     59 
     60 # Check the master password file syntax.
     61 #
     62 if checkyesno check_passwd; then
     63 	awk -v "len=$max_loginlen" '
     64 	BEGIN {
     65 		while ( getline < "/etc/shells" > 0 ) {
     66 			if ($0 ~ /^\#/ || $0 ~ /^$/ )
     67 				continue;
     68 			shells[$1]++;
     69 		}
     70 		FS=":";
     71 	}
     72 
     73 	{
     74 		if ($0 ~ /^[	 ]*$/) {
     75 			printf "Line %d is a blank line.\n", NR;
     76 			next;
     77 		}
     78 		if (NF != 10 && ($1 != "+" || NF != 1))
     79 			printf "Line %d has the wrong number of fields.\n", NR;
     80 		if ($1 == "+" )  {
     81 			if (NF != 1 && $3 == 0)
     82 			    printf "Line %d includes entries with uid 0.\n", NR;
     83 			next;
     84 		}
     85 		if ($1 !~ /^[A-Za-z0-9]([-A-Za-z0-9]*[A-Za-z0-9])*$/)
     86 			printf "Login %s has non-alphanumeric characters.\n",
     87 			    $1;
     88 		if (length($1) > len)
     89 			printf "Login %s has more than "len" characters.\n", $1;
     90 		if ($2 == "")
     91 			printf "Login %s has no password.\n", $1;
     92 		if (length($2) != 13 && 
     93 		    length($2) != 20 && 
     94 		    length($2) != 34 &&
     95 		    $2 != "" &&
     96 		    $2 !~ /^\*[A-z-]+$/ &&
     97 		    $1 != "toor") {
     98 			if ($10 == "" || shells[$10])
     99 		    printf "Login %s is off but still has a valid shell (%s)\n",
    100 				    $1, $10;
    101 		} else if (! shells[$10])
    102 			printf "Login %s does not have a valid shell (%s)\n",
    103 			    $1, $10;
    104 		if ($3 == 0 && $1 != "root" && $1 != "toor")
    105 			printf "Login %s has a user id of 0.\n", $1;
    106 		if ($3 < 0)
    107 			printf "Login %s has a negative user id.\n", $1;
    108 		if ($4 < 0)
    109 			printf "Login %s has a negative group id.\n", $1;
    110 	}' < $MP > $OUTPUT
    111 	if [ -s $OUTPUT ] ; then
    112 		printf "\nChecking the $MP file:\n"
    113 		cat $OUTPUT
    114 	fi
    115 
    116 	awk -F: '{ print $1 }' $MP | sort | uniq -d > $OUTPUT
    117 	if [ -s $OUTPUT ] ; then
    118 		printf "\n$MP has duplicate user names.\n"
    119 		column $OUTPUT
    120 	fi
    121 
    122 # To not exclude 'toor', a standard duplicate root account, from the duplicate
    123 # account test, uncomment the line below (without egrep in it)and comment
    124 # out the line (with egrep in it) below it.
    125 #
    126 #	< $MPBYUID uniq -d -f 1 | awk '{ print $2 }' > $TMP2
    127 	< $MPBYUID egrep -v '^toor ' | uniq -d -f 1 | awk '{ print $2 }' > $TMP2
    128 	if [ -s $TMP2 ] ; then
    129 		printf "\n$MP has duplicate user id's.\n"
    130 		while read uid; do
    131 			grep -w $uid $MPBYUID
    132 		done < $TMP2 | column
    133 	fi
    134 fi
    135 
    136 # Backup the master password file; a special case, the normal backup
    137 # mechanisms also print out file differences and we don't want to do
    138 # that because this file has encrypted passwords in it.
    139 #
    140 CUR=$backup_dir/${MP##*/}.current
    141 BACK=$backup_dir/${MP##*/}.backup
    142 if [ -s $CUR ] ; then
    143 	if cmp -s $CUR $MP; then
    144 		:
    145 	else
    146 		backup_file update $MP $CUR $BACK
    147 	fi
    148 else
    149 	backup_file add $MP $CUR $BACK
    150 fi
    151 
    152 # Check the group file syntax.
    153 #
    154 if checkyesno check_group; then
    155 	GRP=/etc/group
    156 	awk -F: -v "len=$max_grouplen" '{
    157 		if ($0 ~ /^[	 ]*$/) {
    158 			printf "Line %d is a blank line.\n", NR;
    159 			next;
    160 		}
    161 		if (NF != 4 && ($1 != "+" || NF != 1))
    162 			printf "Line %d has the wrong number of fields.\n", NR;
    163 		if ($1 == "+" )  {
    164 			next;
    165 		}
    166 		if ($1 !~ /^[A-Za-z0-9]([-A-Za-z0-9]*[A-Za-z0-9])*$/)
    167 			printf "Group %s has non-alphanumeric characters.\n",
    168 			    $1;
    169 		if (length($1) > len)
    170 			printf "Group %s has more than "len" characters.\n", $1;
    171 		if ($3 !~ /[0-9]*/)
    172 			printf "Login %s has a negative group id.\n", $1;
    173 	}' < $GRP > $OUTPUT
    174 	if [ -s $OUTPUT ] ; then
    175 		printf "\nChecking the $GRP file:\n"
    176 		cat $OUTPUT
    177 	fi
    178 
    179 	awk -F: '{ print $1 }' $GRP | sort | uniq -d > $OUTPUT
    180 	if [ -s $OUTPUT ] ; then
    181 		printf "\n$GRP has duplicate group names.\n"
    182 		column $OUTPUT
    183 	fi
    184 fi
    185 
    186 # Check for root paths, umask values in startup files.
    187 # The check for the root paths is problematical -- it's likely to fail
    188 # in other environments.  Once the shells have been modified to warn
    189 # of '.' in the path, the path tests should go away.
    190 #
    191 if checkyesno check_rootdotfiles; then
    192 	> $OUTPUT
    193 	rhome=`csh -fc "echo ~root"`
    194 	umaskset=no
    195 	list="/etc/csh.cshrc /etc/csh.login ${rhome}/.cshrc ${rhome}/.login"
    196 	for i in $list ; do
    197 		if [ -f $i ] ; then
    198 			if egrep '^[ \t]*umask[ \t]+[0-7]+' $i > /dev/null ; then
    199 				umaskset=yes
    200 			fi
    201 			# double check the umask value itself; ensure that both the
    202 			# 020 and 002 bits are set.
    203 			# we handle this in decimal initially to extract the digits,
    204 			# and then extract the `2' bit of each digit.
    205 			# this is made especially painful because 
    206 			# bitwise operations were left out of awk.
    207 			egrep '^[ \t]*umask[ \t]+[0-7]+' $i |
    208 			awk '{ g= ($2 % 100) - ($2 % 10);
    209 			       g /= 10;
    210 			       g = g % 4;
    211 			       g -= g % 2;
    212 			       if (g != 2) { print "\tRoot umask is group writeable" }
    213 			       o = ($2 % 10);
    214 			       o = o % 4;
    215 			       o -= o % 2;
    216 			       if (o != 2) { print "\tRoot umask is other writeable" } }' |
    217 			    sort -u >> $OUTPUT
    218 			SAVE_PATH=$PATH
    219 			unset PATH
    220 			/bin/csh -f -s << end-of-csh > /dev/null 2>&1
    221 				source $i
    222 				/bin/ls -ldgT \$path > $TMP1
    223 end-of-csh
    224 			PATH=$SAVE_PATH
    225 			awk '{
    226 				if ($10 ~ /^\.$/) {
    227 					print "\tThe root path includes .";
    228 					next;
    229 				}
    230 			     }
    231 			     $1 ~ /^d....w/ \
    232 		{ print "\tRoot path directory " $10 " is group writeable." } \
    233 			     $1 ~ /^d.......w/ \
    234 		{ print "\tRoot path directory " $10 " is other writeable." }' \
    235 			< $TMP1 >> $OUTPUT
    236 		fi
    237 	done
    238 	if [ $umaskset = "no" -o -s $OUTPUT ] ; then
    239 		printf "\nChecking root csh paths, umask values:\n$list\n\n"
    240 		if [ -s $OUTPUT ]; then
    241 			cat $OUTPUT
    242 		fi
    243 		if [ $umaskset = "no" ] ; then
    244 		    printf "\tRoot csh startup files do not set the umask.\n"
    245 		fi
    246 	fi
    247 
    248 	> $OUTPUT
    249 	rhome=/root
    250 	umaskset=no
    251 	list="/etc/profile ${rhome}/.profile"
    252 	for i in $list; do
    253 		if [ -f $i ] ; then
    254 			if egrep umask $i > /dev/null ; then
    255 				umaskset=yes
    256 			fi
    257 			egrep umask $i |
    258 			awk '$2 % 100 < 20 \
    259 				{ print "\tRoot umask is group writeable" } \
    260 			     $2 % 10 < 2 \
    261 				{ print "\tRoot umask is other writeable" }' \
    262 			    >> $OUTPUT
    263 			SAVE_PATH=$PATH
    264 			unset PATH
    265 			/bin/sh << end-of-sh > /dev/null 2>&1
    266 				. $i
    267 				list=\`echo \$PATH | /usr/bin/sed -e \
    268 				    's/^:/.:/;s/:$/:./;s/::/:.:/g;s/:/ /g'\`
    269 				/bin/ls -ldgT \$list > $TMP1
    270 end-of-sh
    271 			PATH=$SAVE_PATH
    272 			awk '{
    273 				if ($10 ~ /^\.$/) {
    274 					print "\tThe root path includes .";
    275 					next;
    276 				}
    277 			     }
    278 			     $1 ~ /^d....w/ \
    279 		{ print "\tRoot path directory " $10 " is group writeable." } \
    280 			     $1 ~ /^d.......w/ \
    281 		{ print "\tRoot path directory " $10 " is other writeable." }' \
    282 			< $TMP1 >> $OUTPUT
    283 
    284 		fi
    285 	done
    286 	if [ $umaskset = "no" -o -s $OUTPUT ] ; then
    287 		printf "\nChecking root sh paths, umask values:\n$list\n"
    288 		if [ -s $OUTPUT ]; then
    289 			cat $OUTPUT
    290 		fi
    291 		if [ $umaskset = "no" ] ; then
    292 			printf "\tRoot sh startup files do not set the umask.\n"
    293 		fi
    294 	fi
    295 fi
    296 
    297 # Root and uucp should both be in /etc/ftpusers.
    298 #
    299 if checkyesno check_ftpusers; then
    300 	> $OUTPUT
    301 	list="uucp "`awk '$2 == 0 { print $1 }' $MPBYUID`
    302 	for i in $list; do
    303 		if /usr/libexec/ftpd -C $i ; then
    304 			printf "\t$i is not denied\n" >> $OUTPUT
    305 		fi
    306 	done
    307 	if [ -s $OUTPUT ]; then
    308 		printf "\nChecking the /etc/ftpusers configuration:\n"
    309 		cat $OUTPUT
    310 	fi
    311 fi
    312 
    313 # Uudecode should not be in the /etc/mail/aliases file.
    314 #
    315 if checkyesno check_aliases; then
    316 	for f in /etc/mail/aliases /etc/aliases; do
    317 		if [ -f $f ] && egrep '^[^#]*(uudecode|decode).*\|' $f; then
    318 			printf "\nEntry for uudecode in $f file.\n"
    319 		fi
    320 	done
    321 fi
    322 
    323 # Files that should not have + signs.
    324 #
    325 if checkyesno check_rhosts; then
    326 	list="/etc/hosts.equiv /etc/hosts.lpd"
    327 	for f in $list ; do
    328 		if [ -f $f ] && egrep '\+' $f > /dev/null ; then
    329 			printf "\nPlus sign in $f file.\n"
    330 		fi
    331 	done
    332 
    333 	# Check for special users with .rhosts files.  Only root and toor should
    334 	# have .rhosts files.  Also, .rhosts files should not have plus signs.
    335 	awk -F: '$1 != "root" && $1 != "toor" && \
    336 		($3 < 100 || $1 == "ftp" || $1 == "uucp") \
    337 			{ print $1 " " $9 }' $MP |
    338 	sort -k2 |
    339 	while read uid homedir; do
    340 		if [ -f ${homedir}/.rhosts ] ; then
    341 			rhost=`ls -ldgT ${homedir}/.rhosts`
    342 			printf -- "$uid: $rhost\n"
    343 		fi
    344 	done > $OUTPUT
    345 	if [ -s $OUTPUT ] ; then
    346 		printf "\nChecking for special users with .rhosts files.\n"
    347 		cat $OUTPUT
    348 	fi
    349 
    350 	while read uid homedir; do
    351 		if [ -f ${homedir}/.rhosts -a -r ${homedir}/.rhosts ] && \
    352 		    cat -f ${homedir}/.rhosts | egrep '\+' > /dev/null ; then
    353 			printf -- "$uid: + in .rhosts file.\n"
    354 		fi
    355 	done < $MPBYPATH > $OUTPUT
    356 	if [ -s $OUTPUT ] ; then
    357 		printf "\nChecking .rhosts files syntax.\n"
    358 		cat $OUTPUT
    359 	fi
    360 fi
    361 
    362 # Check home directories.  Directories should not be owned by someone else
    363 # or writeable.
    364 #
    365 if checkyesno check_homes; then
    366 	while read uid homedir; do
    367 		if [ -d ${homedir}/ ] ; then
    368 			file=`ls -ldgT ${homedir}`
    369 			printf -- "$uid $file\n"
    370 		fi
    371 	done < $MPBYPATH |
    372 	awk '$1 != $4 && $4 != "root" \
    373 		{ print "user " $1 " home directory is owned by " $4 }
    374 	     $2 ~ /^-....w/ \
    375 		{ print "user " $1 " home directory is group writeable" }
    376 	     $2 ~ /^-.......w/ \
    377 		{ print "user " $1 " home directory is other writeable" }' \
    378 	    > $OUTPUT
    379 	if [ -s $OUTPUT ] ; then
    380 		printf "\nChecking home directories.\n"
    381 		cat $OUTPUT
    382 	fi
    383 
    384 	# Files that should not be owned by someone else or readable.
    385 	list=".Xauthority .netrc"
    386 	while read uid homedir; do
    387 		for f in $list ; do
    388 			file=${homedir}/${f}
    389 			if [ -f $file ] ; then
    390 				printf -- "$uid $f `ls -ldgT $file`\n"
    391 			fi
    392 		done
    393 	done < $MPBYPATH |
    394 	awk '$1 != $5 && $5 != "root" \
    395 		{ print "user " $1 " " $2 " file is owned by " $5 }
    396 	     $3 ~ /^-...r/ \
    397 		{ print "user " $1 " " $2 " file is group readable" }
    398 	     $3 ~ /^-......r/ \
    399 		{ print "user " $1 " " $2 " file is other readable" }
    400 	     $3 ~ /^-....w/ \
    401 		{ print "user " $1 " " $2 " file is group writeable" }
    402 	     $3 ~ /^-.......w/ \
    403 		{ print "user " $1 " " $2 " file is other writeable" }' \
    404 	    > $OUTPUT
    405 
    406 	# Files that should not be owned by someone else or writeable.
    407 	list=".bash_history .bash_login .bash_logout .bash_profile .bashrc \
    408 	      .cshrc .emacs .exrc .forward .history .klogin .login .logout \
    409 	      .profile .qmail .rc_history .rhosts .tcshrc .twmrc .xinitrc \
    410 	      .xsession"
    411 	while read uid homedir; do
    412 		for f in $list ; do
    413 			file=${homedir}/${f}
    414 			if [ -f $file ] ; then
    415 				printf -- "$uid $f `ls -ldgT $file`\n"
    416 			fi
    417 		done
    418 	done < $MPBYPATH |
    419 	awk '$1 != $5 && $5 != "root" \
    420 		{ print "user " $1 " " $2 " file is owned by " $5 }
    421 	     $3 ~ /^-....w/ \
    422 		{ print "user " $1 " " $2 " file is group writeable" }
    423 	     $3 ~ /^-.......w/ \
    424 		{ print "user " $1 " " $2 " file is other writeable" }' \
    425 	    >> $OUTPUT
    426 	if [ -s $OUTPUT ] ; then
    427 		printf "\nChecking dot files.\n"
    428 		cat $OUTPUT
    429 	fi
    430 fi
    431 
    432 # Mailboxes should be owned by user and unreadable.
    433 #
    434 if checkyesno check_varmail; then
    435 	ls -l /var/mail | sed 1d | \
    436 	awk '$3 != $9 \
    437 		{ print "user " $9 " mailbox is owned by " $3 }
    438 	     $1 != "-rw-------" \
    439 		{ print "user " $9 " mailbox is " $1 ", group " $4 }' > $OUTPUT
    440 	if [ -s $OUTPUT ] ; then
    441 		printf "\nChecking mailbox ownership.\n"
    442 		cat $OUTPUT
    443 	fi
    444 fi
    445 
    446 # NFS exports shouldn't be globally exported
    447 #
    448 if checkyesno check_nfs && [ -f /etc/exports ]; then
    449 	awk '{
    450 		# ignore comments and blank lines
    451 		if ($0 ~ /^\#/ || $0 ~ /^$/ )
    452 			next;
    453 
    454 		readonly = 0;
    455 		for (i = 2; i <= NF; ++i) {
    456 			if ($i ~ /-ro/)
    457 				readonly = 1;
    458 			else if ($i !~ /^-/)
    459 				next;
    460 		}
    461 		if (readonly)
    462 			print "File system " $1 " globally exported, read-only."
    463 		else
    464 			print "File system " $1 " globally exported, read-write."
    465 	}' < /etc/exports > $OUTPUT
    466 	if [ -s $OUTPUT ] ; then
    467 		printf "\nChecking for globally exported file systems.\n"
    468 		cat $OUTPUT
    469 	fi
    470 fi
    471 
    472 # Display any changes in setuid files and devices.
    473 #
    474 if checkyesno check_devices; then
    475 	> $ERR
    476 	(find / \( ! -fstype local -o -fstype fdesc -o -fstype kernfs \
    477 			-o -fstype procfs \) -a -prune -o \
    478 	    \( \( -perm -u+s -a ! -type d \) -o \
    479 	       \( -perm -g+s -a ! -type d \) -o \
    480 	       -type b -o -type c \) -print0 | \
    481 	xargs -0 ls -ldgTq | sort +9 > $LIST) 2> $OUTPUT
    482 
    483 	# Display any errors that occurred during system file walk.
    484 	if [ -s $OUTPUT ] ; then
    485 		printf "Setuid/device find errors:\n" >> $ERR
    486 		cat $OUTPUT >> $ERR
    487 		printf "\n" >> $ERR
    488 	fi
    489 
    490 	# Display any changes in the setuid file list.
    491 	egrep -v '^[bc]' $LIST > $TMP1
    492 	if [ -s $TMP1 ] ; then
    493 		# Check to make sure uudecode isn't setuid.
    494 		if grep -w uudecode $TMP1 > /dev/null ; then
    495 			printf "\nUudecode is setuid.\n" >> $ERR
    496 		fi
    497 
    498 		CUR=$backup_dir/setuid.current
    499 		BACK=$backup_dir/setuid.backup
    500 
    501 		if [ -s $CUR ] ; then
    502 			if cmp -s $CUR $TMP1 ; then
    503 				:
    504 			else
    505 				> $TMP2
    506 				join -110 -210 -v2 $CUR $TMP1 > $OUTPUT
    507 				if [ -s $OUTPUT ] ; then
    508 					printf "Setuid additions:\n" >> $ERR
    509 					tee -a $TMP2 < $OUTPUT >> $ERR
    510 					printf "\n" >> $ERR
    511 				fi
    512 
    513 				join -110 -210 -v1 $CUR $TMP1 > $OUTPUT
    514 				if [ -s $OUTPUT ] ; then
    515 					printf "Setuid deletions:\n" >> $ERR
    516 					tee -a $TMP2 < $OUTPUT >> $ERR
    517 					printf "\n" >> $ERR
    518 				fi
    519 
    520 				sort -k10 $TMP2 $CUR $TMP1 | \
    521 				    sed -e 's/[	 ][	 ]*/ /g' | \
    522 				    uniq -u > $OUTPUT
    523 				if [ -s $OUTPUT ] ; then
    524 					printf "Setuid changes:\n" >> $ERR
    525 					column -t $OUTPUT >> $ERR
    526 					printf "\n" >> $ERR
    527 				fi
    528 
    529 				backup_file update $TMP1 $CUR $BACK
    530 			fi
    531 		else
    532 			printf "Setuid additions:\n" >> $ERR
    533 			column -t $TMP1 >> $ERR
    534 			printf "\n" >> $ERR
    535 			backup_file add $TMP1 $CUR $BACK
    536 		fi
    537 	fi
    538 
    539 	# Check for block and character disk devices that are readable or
    540 	# writeable or not owned by root.operator.
    541 	>$TMP1
    542 	DISKLIST="ccd ch hk hp ld md ra raid rb rd rl rx \
    543 	    sd se ss 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 				backup_file update $TMP1 $CUR $BACK
    599 			fi
    600 		else
    601 			printf "Device additions:\n" >> $ERR
    602 			column -t $TMP1 >> $ERR
    603 			printf "\n" >> $ERR
    604 			backup_file add $TMP1 $CUR $BACK >> $ERR
    605 		fi
    606 	fi
    607 	if [ -s $ERR ] ; then
    608 		printf "\nChecking setuid files and devices:\n"
    609 		cat $ERR
    610 		printf "\n"
    611 	fi
    612 fi
    613 
    614 # Check special files.
    615 # Check system binaries.
    616 #
    617 # Create the mtree tree specifications using:
    618 #
    619 #	mtree -cx -pDIR -kcksum,gid,mode,nlink,size,link,time,uid > DIR.secure
    620 #	chown root:wheel DIR.secure
    621 #	chmod 600 DIR.secure
    622 #
    623 # Note, this is not complete protection against Trojan horsed binaries, as
    624 # the hacker can modify the tree specification to match the replaced binary.
    625 # For details on really protecting yourself against modified binaries, see
    626 # the mtree(8) manual page.
    627 #
    628 if checkyesno check_mtree; then
    629 	mtree -e -l -p / -f /etc/mtree/special > $OUTPUT
    630 	if [ -s $OUTPUT ]; then
    631 		printf "\nChecking special files and directories.\n"
    632 		cat $OUTPUT
    633 	fi
    634 
    635 	> $OUTPUT
    636 	for file in /etc/mtree/*.secure; do
    637 		[ $file = '/etc/mtree/*.secure' ] && continue
    638 		tree=`sed -n -e '3s/.* //p' -e 3q $file`
    639 		mtree -f $file -p $tree > $TMP1
    640 		if [ -s $TMP1 ]; then
    641 			printf "\nChecking $tree:\n" >> $OUTPUT
    642 			cat $TMP1 >> $OUTPUT
    643 		fi
    644 	done
    645 	if [ -s $OUTPUT ]; then
    646 		printf "\nChecking system binaries:\n"
    647 		cat $OUTPUT
    648 	fi
    649 fi
    650 
    651 # Backup disklabels of available disks
    652 #
    653 if checkyesno check_disklabels; then
    654 		# generate list of old disklabels and remove them
    655 	ls -1d $backup_dir/disklabel.* 2>/dev/null |
    656 	    egrep -v '\.(backup|current)(,v)?$' > $LABELS
    657 	xargs rm < $LABELS
    658 
    659 	disks=`iostat -x | sed 1d | awk '$1 !~ /^[cfm]d/ { print $1; }'`
    660 	for i in $disks; do
    661 		dlf="$backup_dir/disklabel.$i"
    662 		disklabel $i > $dlf 2>/dev/null
    663 	done
    664 
    665 		# append list of new disklabels, sort list
    666 	ls -1d $backup_dir/disklabel.* 2>/dev/null |
    667 	    egrep -v '\.(backup|current)(,v)?$' >> $LABELS
    668 	sort -u -o $LABELS $LABELS
    669 	CHANGELIST="$LABELS $CHANGELIST"
    670 fi
    671 
    672 # Check for changes in the list of installed pkgs
    673 #
    674 if checkyesno check_pkgs && [ -d $pkg_dbdir ]; then
    675 	pkgs=$backup_dir/pkgs
    676 	(	cd $pkg_dbdir
    677 		pkg_info | sort
    678 		echo ""
    679 		find . \( -name +REQUIRED_BY -o -name +CONTENTS \) -print0 |
    680 			xargs -0 ls -l | sort -t. +1 | sed -e 's, \./, ,'
    681 	 ) > $pkgs
    682 	echo $pkgs > $PKGS
    683 	CHANGELIST="$PKGS $CHANGELIST"
    684 fi
    685 
    686 # List of files that get backed up and checked for any modifications.  Each
    687 # file is expected to have two backups, $backup_dir/file.{current,backup}.
    688 # Any changes cause the files to rotate.
    689 #
    690 if checkyesno check_changelist && [ -s /etc/changelist ] ; then
    691 	CHANGELIST="/etc/changelist $CHANGELIST"
    692 fi
    693 
    694 if [ -n "$CHANGELIST" ]; then
    695 	for file in `egrep -hv "^#|$MP" $CHANGELIST`; do
    696 		# old changelist backup names
    697 		OCUR=$backup_dir/${file##*/}.current
    698 		OBACK=$backup_dir/${file##*/}.backup
    699 		# new changelist backup names
    700 		CUR=$backup_dir$file.current
    701 		BACK=$backup_dir$file.backup
    702 		# roll over old backups
    703 		if [ ! -d ${CUR%/*} ]; then
    704 			mkdir -p ${CUR%/*}
    705 		fi
    706 		if [ -f $OCUR -a ! -f $CUR ]; then
    707 			mv $OCUR $CUR
    708 		fi
    709 		if [ -f $OCUR,v -a ! -f $CUR,v ]; then
    710 			mv $OCUR,v $CUR,v
    711 		fi
    712 		if [ -f $OBACK -a ! -f $BACK ]; then
    713 			mv $OBACK $BACK
    714 		fi
    715 		# and down to work
    716 		if [ -f $file ]; then
    717 			if [ -f $CUR ] ; then
    718 				diff $CUR $file > $OUTPUT
    719 				if [ -s $OUTPUT ] ; then
    720 		printf "\n======\n%s diffs (OLD < > NEW)\n======\n" $file
    721 					cat $OUTPUT
    722 					backup_file update $file $CUR $BACK
    723 				fi
    724 			else
    725 		printf "\n======\n%s added\n======\n" $file
    726 				diff /dev/null $file
    727 				backup_file add $file $CUR $BACK
    728 			fi
    729 		else
    730 			if [ -f $CUR ]; then
    731 		printf "\n======\n%s removed\n======\n" $file
    732 				diff $CUR /dev/null
    733 				backup_file remove $file $CUR $BACK
    734 			fi
    735 		fi
    736 	done
    737 fi
    738 
    739 if [ -f /etc/security.local ]; then
    740 	echo ""
    741 	echo "Running /etc/security.local:"
    742 	. /etc/security.local
    743 fi
    744