openwrt/package/system/urandom-seed/files/etc/init.d/urandom_seed
Jason A. Donenfeld 2edc017a6e urandom-seed: use seedrng for seeding the random number generator
The RNG can't actually be seeded from a shell script, due to the
reliance on ioctls. For this reason, the seedrng project provides a
basic script meant to be copy and pasted into projects like OpenWRT
and tweaked as needed: <https://git.zx2c4.com/seedrng/about/>.

This commit imports it into the urandom-seed package and wires up the
init scripts to call it. This also is a significant improvement over the
current init script, which does not robustly handle cleaning up of seeds
and syncing to prevent reuse. Additionally, the existing script creates
a new seed immediately after writing an old one, which means that the
amount of entropy might actually regress, due to failing to credit the
old seed.

Closes: https://github.com/openwrt/openwrt/issues/9570
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Petr Štetiar <ynezz@true.cz> [fixed missing INSTALL_DIR]
2022-03-28 09:27:56 +02:00

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#!/bin/sh /etc/rc.common
START=99
USE_PROCD=1
start_service() {
procd_open_instance "urandom_seed"
procd_set_param command "/sbin/seedrng"
procd_set_param stdout 1
procd_set_param stderr 1
procd_close_instance
}