Implement server-side support for sk-ecdsa U2F-backed keys (#142) * Implement server-side support for sk-ecdsa U2F-backed keys * Fix out-of-bounds read on normal ecdsa-sha2-[identifier] keys * Fix one more potential out-of-bounds read * Check if nistp256 curve is used in sk-ecdsa-sha2- key It's the only allowed curve per PROTOCOL.u2f specification * Implement server-side support for sk-ed25519 FIDO2-backed keys * Keys with type sk-* make no sense as host keys, so they should be disabled * fix typo * Make sk-ecdsa call buf_ecdsa_verify This reduces code duplication, the SK code just handles the different message format. * Reduce sk specific code The application id can be stored in signkey, then we don't need to call sk-specific functions from svr-authpubkey * Remove debugging output, which causes compilation errors with DEBUG_TRACE disabled * Proper cleanup of sk_app Co-authored-by: Matt Johnston <[email protected]>

#! /bin/sh
set -e

test "$1" = 'purge' || exit 0
if test -e /etc/dropbear; then
  rm -f /etc/dropbear/dropbear_rsa_host_key
  rm -f /etc/dropbear/dropbear_dss_host_key
  rmdir --ignore-fail-on-non-empty /etc/dropbear
fi
update-rc.d dropbear remove >/dev/null
rm -f /etc/default/dropbear
rm -rf /etc/dropbear/supervise /etc/dropbear/log/supervise