From 503aa7f9fbb3ca73437aeb2adf492dd8f1d2ab7f Mon Sep 17 00:00:00 2001 From: Etienne Champetier Date: Mon, 10 Jul 2023 07:56:05 +0200 Subject: [PATCH] dropbear: add ed25519 for failsafe key At least Fedora and RHEL 9 set RSAMinSize=2048, so when trying to use failsafe, we get 'Bad server host key: Invalid key length' To workaround the issue, we can use: ssh -o RSAMinSize=1024 ... Generating 2048 bits RSA is extremely slow, so add ed25519. We keep RSA 1024 to be as compatible as possible. Signed-off-by: Etienne Champetier (cherry picked from commit 6ac61dead99ff6b9df00c29b7a858772449718b2) --- package/network/services/dropbear/files/dropbear.failsafe | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/package/network/services/dropbear/files/dropbear.failsafe b/package/network/services/dropbear/files/dropbear.failsafe index a98ede459a..97bd12d58a 100755 --- a/package/network/services/dropbear/files/dropbear.failsafe +++ b/package/network/services/dropbear/files/dropbear.failsafe @@ -1,8 +1,9 @@ #!/bin/sh failsafe_dropbear () { - dropbearkey -t rsa -s 1024 -f /tmp/dropbear_failsafe_host_key - dropbear -r /tmp/dropbear_failsafe_host_key <> /dev/null 2>&1 + dropbearkey -t rsa -s 1024 -f /tmp/dropbear_rsa_failsafe_host_key + dropbearkey -t ed25519 -f /tmp/dropbear_ed25519_failsafe_host_key + dropbear -r /tmp/dropbear_rsa_failsafe_host_key -r /tmp/dropbear_ed25519_failsafe_host_key <> /dev/null 2>&1 } boot_hook_add failsafe failsafe_dropbear -- 2.30.2