https://github.com/fphammerle/docker-borgbackup-sshd/commit/17b658f070505f80d8d48637785145a3c91fe171
@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
## [Unreleased]
+### Changed
+- `sshd`: no longer accept RSA keys < 2048 bits for authentication
## [2.0.1] - 2021-06-20
### Fixed
@@ -22,6 +22,10 @@ HostKeyAlgorithms ssh-ed25519,ssh-ed25519-cert-v01@openssh.com,rsa-sha2-256,rsa-
AllowUsers dump
AuthenticationMethods publickey
PubkeyAuthentication yes
+# > RSA: The length of the modulus n shall be 2048 bits or more to meet the
+# > minimum security-strength requirement of 112 bits [...]
+# https://csrc.nist.gov/publications/detail/sp/800-131a/rev-2/final
+RequiredRSASize 2048
PasswordAuthentication no
ChallengeResponseAuthentication no
StrictModes no