From 0827c29566f3ea63715a9f9e4ee2639f4eabe0bd Mon Sep 17 00:00:00 2001 From: Matthew Bullock Date: Thu, 27 Jun 2024 14:15:56 +0100 Subject: [PATCH] openssh: allow configuration of hostkey type Allow selection of host key types used by openssh via PACKAGECONFIG. Any combination of hostkey-rsa, hostkey-ecdsa and hostkey-ed25519 can be specified. Default to just generating ecdsa keys. The current default generates all three keys. This can take a significant amount of time on first boot. Having all three keys does not significantly increase compatability. Also RSA keys are being deprecated as they are no longer considered secure. Using just an ecdsa key reduces key generation time by roughly 75%. Signed-off-by: Matthew Bullock Signed-off-by: Richard Purdie --- .../openssh/openssh_9.7p1.bb | 29 ++++++++++++++++--- 1 file changed, 25 insertions(+), 4 deletions(-) diff --git a/meta/recipes-connectivity/openssh/openssh_9.7p1.bb b/meta/recipes-connectivity/openssh/openssh_9.7p1.bb index ab453f7bbeb..0bc14c55539 100644 --- a/meta/recipes-connectivity/openssh/openssh_9.7p1.bb +++ b/meta/recipes-connectivity/openssh/openssh_9.7p1.bb @@ -56,7 +56,7 @@ DEPENDS += "${@bb.utils.contains('DISTRO_FEATURES', 'systemd', 'systemd', '', d) # systemd-sshd-socket-mode means installing sshd.socket # and systemd-sshd-service-mode corresponding to sshd.service -PACKAGECONFIG ??= "systemd-sshd-socket-mode" +PACKAGECONFIG ??= "systemd-sshd-socket-mode hostkey-ecdsa" PACKAGECONFIG[fido2] = "--with-security-key-builtin,--disable-security-key,libfido2" PACKAGECONFIG[kerberos] = "--with-kerberos5,--without-kerberos5,krb5" PACKAGECONFIG[ldns] = "--with-ldns,--without-ldns,ldns" @@ -64,6 +64,9 @@ PACKAGECONFIG[libedit] = "--with-libedit,--without-libedit,libedit" PACKAGECONFIG[manpages] = "--with-mantype=man,--with-mantype=cat" PACKAGECONFIG[systemd-sshd-socket-mode] = "" PACKAGECONFIG[systemd-sshd-service-mode] = "" +PACKAGECONFIG[hostkey-rsa] = "" +PACKAGECONFIG[hostkey-ecdsa] = "" +PACKAGECONFIG[hostkey-ed25519] = "" EXTRA_AUTORECONF += "--exclude=aclocal" @@ -127,13 +130,31 @@ do_install:append () { install -m 644 ${UNPACKDIR}/volatiles.99_sshd ${D}/${sysconfdir}/default/volatiles/99_sshd install -m 0755 ${S}/contrib/ssh-copy-id ${D}${bindir} + # Enable specific ssh host keys + sed -i '/HostKey/d' ${D}${sysconfdir}/ssh/sshd_config + if ${@bb.utils.contains('PACKAGECONFIG','hostkey-rsa','true','false',d)}; then + echo "HostKey /etc/ssh/ssh_host_rsa_key" >> ${D}${sysconfdir}/ssh/sshd_config + fi + if ${@bb.utils.contains('PACKAGECONFIG','hostkey-ecdsa','true','false',d)}; then + echo "HostKey /etc/ssh/ssh_host_ecdsa_key" >> ${D}${sysconfdir}/ssh/sshd_config + fi + if ${@bb.utils.contains('PACKAGECONFIG','hostkey-ed25519','true','false',d)}; then + echo "HostKey /etc/ssh/ssh_host_ed25519_key" >> ${D}${sysconfdir}/ssh/sshd_config + fi + # Create config files for read-only rootfs install -d ${D}${sysconfdir}/ssh install -m 644 ${D}${sysconfdir}/ssh/sshd_config ${D}${sysconfdir}/ssh/sshd_config_readonly sed -i '/HostKey/d' ${D}${sysconfdir}/ssh/sshd_config_readonly - echo "HostKey /var/run/ssh/ssh_host_rsa_key" >> ${D}${sysconfdir}/ssh/sshd_config_readonly - echo "HostKey /var/run/ssh/ssh_host_ecdsa_key" >> ${D}${sysconfdir}/ssh/sshd_config_readonly - echo "HostKey /var/run/ssh/ssh_host_ed25519_key" >> ${D}${sysconfdir}/ssh/sshd_config_readonly + if ${@bb.utils.contains('PACKAGECONFIG','hostkey-rsa','true','false',d)}; then + echo "HostKey /var/run/ssh/ssh_host_rsa_key" >> ${D}${sysconfdir}/ssh/sshd_config_readonly + fi + if ${@bb.utils.contains('PACKAGECONFIG','hostkey-ecdsa','true','false',d)}; then + echo "HostKey /var/run/ssh/ssh_host_ecdsa_key" >> ${D}${sysconfdir}/ssh/sshd_config_readonly + fi + if ${@bb.utils.contains('PACKAGECONFIG','hostkey-ed25519','true','false',d)}; then + echo "HostKey /var/run/ssh/ssh_host_ed25519_key" >> ${D}${sysconfdir}/ssh/sshd_config_readonly + fi install -d ${D}${systemd_system_unitdir} if ${@bb.utils.contains('PACKAGECONFIG','systemd-sshd-socket-mode','true','false',d)}; then -- 2.47.3