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random_seed revision 1.1 
      1  1.1  tls #!/bin/sh
      2  1.1  tls #
      3  1.1  tls # $NetBSD: random_seed,v 1.1 2011/11/23 10:47:48 tls Exp $
      4  1.1  tls #
      5  1.1  tls 
      6  1.1  tls # PROVIDE: random_seed
      7  1.1  tls # REQUIRE: mountcritlocal
      8  1.1  tls # BEFORE: securelevel
      9  1.1  tls # KEYWORD: shutdown
     10  1.1  tls 
     11  1.1  tls $_rc_subr_loaded . /etc/rc.subr
     12  1.1  tls 
     13  1.1  tls name="random_seed"
     14  1.1  tls rcvar=$name
     15  1.1  tls start_cmd="random_load"
     16  1.1  tls stop_cmd="random_save"
     17  1.1  tls 
     18  1.1  tls random_file=${random_file:-/var/db/entropy-file}
     19  1.1  tls 
     20  1.1  tls fs_safe()
     21  1.1  tls {
     22  1.1  tls 	#
     23  1.1  tls 	# Enforce that the file's on a local filesystem.
     24  1.1  tls 	# Include only the types we can actually write.
     25  1.1  tls 	#
     26  1.1  tls 	fstype=$(df -G $1 | awk '$2 == "fstype" {print $1}')
     27  1.1  tls 	case $fstype in
     28  1.1  tls 	    ffs)
     29  1.1  tls 		return 0
     30  1.1  tls 		;;
     31  1.1  tls 	    lfs)
     32  1.1  tls 		return 0
     33  1.1  tls 		;;
     34  1.1  tls 	    ext2fs)
     35  1.1  tls 		return 0;
     36  1.1  tls 		;;
     37  1.1  tls 	    msdosfs)
     38  1.1  tls 		return 0;
     39  1.1  tls 		;;
     40  1.1  tls 	    v7fs)
     41  1.1  tls 		return 0;
     42  1.1  tls 		;;
     43  1.1  tls 	 esac
     44  1.1  tls 	 return 1
     45  1.1  tls }
     46  1.1  tls 
     47  1.1  tls random_load()
     48  1.1  tls {
     49  1.1  tls 	if [ -f $random_file ]; then
     50  1.1  tls 
     51  1.1  tls 		if ! fs_safe $(dirname ${random_file}); then
     52  1.1  tls 			return 1
     53  1.1  tls 		fi
     54  1.1  tls 
     55  1.1  tls 		eval $(stat -s ${random_file})
     56  1.1  tls 
     57  1.1  tls 		# The file must be owned by root,
     58  1.1  tls 		if [ "$st_uid" != "0" ]; then
     59  1.1  tls 			return 1
     60  1.1  tls 		fi
     61  1.1  tls 		# and root read/write only.
     62  1.1  tls 		if [ "$(echo $st_mode | tail -c4)" != "600" ]; then
     63  1.1  tls 			return 1
     64  1.1  tls 		fi
     65  1.1  tls 
     66  1.1  tls 		if rndctl -L ${random_file}; then
     67  1.1  tls 			echo "Loaded entropy from disk."
     68  1.1  tls 		fi
     69  1.1  tls 		
     70  1.1  tls 	fi
     71  1.1  tls }
     72  1.1  tls 
     73  1.1  tls random_save()
     74  1.1  tls {
     75  1.1  tls 	oum=$(umask)
     76  1.1  tls 	umask 077
     77  1.1  tls 
     78  1.1  tls 	rm -Pf ${random_file}
     79  1.1  tls 
     80  1.1  tls 	if ! fs_safe $(dirname ${random_file}); then
     81  1.1  tls 		return 1
     82  1.1  tls 	fi
     83  1.1  tls 
     84  1.1  tls 	if rndctl -S ${random_file}; then
     85  1.1  tls 		echo "Saved entropy to disk."
     86  1.1  tls 	fi
     87  1.1  tls }
     88  1.1  tls 
     89  1.1  tls 
     90  1.1  tls load_rc_config $name
     91  1.1  tls run_rc_command "$1"
     92