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| -rw-r--r-- | urandom-save.conf | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/urandom-save.conf b/urandom-save.conf new file mode 100644 index 0000000..eecac2d --- /dev/null +++ b/urandom-save.conf @@ -0,0 +1,25 @@ +# urandom-save - save a new seed-file, for use by kernel PRNG at next boot +# + +description "save seed-file for use by kernel PRNG" + +# a) We should refresh the seed-file as soon as possible +# i.e. as soon as the filesystem is mounted and writeable. +# b) We should also refresh it again as late as possible, +# i.e. when shutting down, i.e. runlevels other than 2345 +start on (filesystem or runlevel [!2345]) + +task +console output + +script + SAVEDFILE=/var/lib/urandom/random-seed # probably belongs in a config file +# 512 is usually the right size, as documented in drivers/char/random.c + POOLSIZE=512 # size in bytes + if test -f /proc/sys/kernel/random/poolsize \ + && ProcPoolSize="$(cat /proc/sys/kernel/random/poolsize)" ; then +# Kernels 2.6.12 and later report poolsize in bits; we convert to bytes here: + POOLSIZE=$((ProcPoolSize/8)) + fi + dd if=/dev/urandom of=$SAVEDFILE bs=$POOLSIZE count=1 >/dev/null 2>&1 +end script |