1#!/bin/sh 2# 3# $FreeBSD$ 4# 5 6# PROVIDE: random 7# REQUIRE: FILESYSTEMS 8# BEFORE: netif 9# KEYWORD: nojail shutdown 10 11. /etc/rc.subr 12 13name="random" 14desc="Harvest and save entropy for random device" 15start_cmd="random_start" 16stop_cmd="random_stop" 17 18extra_commands="saveseed" 19saveseed_cmd="${name}_stop" 20 21save_dev_random() 22{ 23 oumask=`umask` 24 umask 077 25 for f ; do 26 debug "saving entropy to $f" 27 dd if=/dev/random of="$f" bs=4096 count=1 status=none && 28 ( chflags nodump "$f" 2>/dev/null || : ) && 29 chmod 600 "$f" && 30 fsync "$f" "$(dirname "$f")" 31 done 32 umask ${oumask} 33} 34 35feed_dev_random() 36{ 37 for f ; do 38 if [ -f "$f" -a -r "$f" -a -s "$f" ] ; then 39 if dd if="$f" of=/dev/random bs=4096 2>/dev/null ; then 40 debug "entropy read from $f" 41 rm -f "$f" 42 fi 43 fi 44 done 45} 46 47random_start() 48{ 49 50 if [ ${harvest_mask} -gt 0 ]; then 51 echo -n 'Setting up harvesting: ' 52 ${SYSCTL} kern.random.harvest.mask=${harvest_mask} > /dev/null 53 ${SYSCTL_N} kern.random.harvest.mask_symbolic 54 fi 55 56 echo -n 'Feeding entropy: ' 57 58 if [ ! -w /dev/random ] ; then 59 warn "/dev/random is not writeable" 60 return 1 61 fi 62 63 # Reseed /dev/random with previously stored entropy. 64 case ${entropy_dir:=/var/db/entropy} in 65 [Nn][Oo]) 66 ;; 67 *) 68 if [ -d "${entropy_dir}" ] ; then 69 feed_dev_random "${entropy_dir}"/* 70 fi 71 ;; 72 esac 73 74 case ${entropy_file:=/entropy} in 75 [Nn][Oo]) 76 ;; 77 *) 78 feed_dev_random "${entropy_file}" /var/db/entropy-file 79 save_dev_random "${entropy_file}" 80 ;; 81 esac 82 83 case ${entropy_boot_file:=/boot/entropy} in 84 [Nn][Oo]) 85 ;; 86 *) 87 save_dev_random "${entropy_boot_file}" 88 ;; 89 esac 90 91 echo '.' 92} 93 94random_stop() 95{ 96 # Write some entropy so when the machine reboots /dev/random 97 # can be reseeded 98 # 99 case ${entropy_file:=/entropy} in 100 [Nn][Oo]) 101 ;; 102 *) 103 echo -n 'Writing entropy file: ' 104 rm -f ${entropy_file} 2> /dev/null 105 oumask=`umask` 106 umask 077 107 if touch ${entropy_file} 2> /dev/null; then 108 entropy_file_confirmed="${entropy_file}" 109 else 110 # Try this as a reasonable alternative for read-only 111 # roots, diskless workstations, etc. 112 rm -f /var/db/entropy-file 2> /dev/null 113 if touch /var/db/entropy-file 2> /dev/null; then 114 entropy_file_confirmed=/var/db/entropy-file 115 fi 116 fi 117 case ${entropy_file_confirmed} in 118 '') 119 warn 'write failed (read-only fs?)' 120 ;; 121 *) 122 save_dev_random "${entropy_file_confirmed}" 123 echo '.' 124 ;; 125 esac 126 umask ${oumask} 127 ;; 128 esac 129 case ${entropy_boot_file:=/boot/entropy} in 130 [Nn][Oo]) 131 ;; 132 *) 133 echo -n 'Writing early boot entropy file: ' 134 rm -f ${entropy_boot_file} 2> /dev/null 135 oumask=`umask` 136 umask 077 137 if touch ${entropy_boot_file} 2> /dev/null; then 138 entropy_boot_file_confirmed="${entropy_boot_file}" 139 fi 140 case ${entropy_boot_file_confirmed} in 141 '') 142 warn 'write failed (read-only fs?)' 143 ;; 144 *) 145 save_dev_random "${entropy_boot_file_confirmed}" 146 echo '.' 147 ;; 148 esac 149 umask ${oumask} 150 ;; 151 esac 152} 153 154load_rc_config $name 155run_rc_command "$1" 156