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Remove SSH host keys after installing the custom version of sshd (#10633)

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* Remove SSH host keys after installing the custom version of sshd

Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>

* Use an override for for sshd instead of overwriting the service file

Don't overwrite upstream's .service file, and instead use an override
file for making sure the host key(s) are generated.

Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>
This commit is contained in:
Saikrishna Arcot 2022-04-25 13:38:52 -04:00 committed by Judy Joseph
parent e2a2b30676
commit f1ec7107cb
4 changed files with 11 additions and 19 deletions
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3
build_debian.sh
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@ -400,7 +400,8 @@ sudo sed -i 's/LOAD_KEXEC=true/LOAD_KEXEC=false/' $FILESYSTEM_ROOT/etc/default/k
## Remove sshd host keys, and will regenerate on first sshd start
sudo rm -f $FILESYSTEM_ROOT/etc/ssh/ssh_host_*_key*
sudo cp files/sshd/host-ssh-keygen.sh $FILESYSTEM_ROOT/usr/local/bin/
sudo cp -f files/sshd/sshd.service $FILESYSTEM_ROOT/lib/systemd/system/ssh.service
sudo mkdir $FILESYSTEM_ROOT/etc/systemd/system/ssh.service.d
sudo cp files/sshd/override.conf $FILESYSTEM_ROOT/etc/systemd/system/ssh.service.d/override.conf
# Config sshd
# 1. Set 'UseDNS' to 'no'
# 2. Configure sshd to close all SSH connetions after 15 minutes of inactivity

5
files/build_templates/sonic_debian_extension.j2
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@ -329,6 +329,11 @@ sudo dpkg --root=$FILESYSTEM_ROOT -i $debs_path/smartmontools_*.deb
# Install custom-built openssh sshd
sudo dpkg --root=$FILESYSTEM_ROOT -i $debs_path/openssh-server_*.deb
# Remove sshd host keys, and will regenerate on first sshd start. This needs to be
# done again here because our custom version of sshd is being installed, which
# will regenerate the sshd host keys.
sudo rm -f $FILESYSTEM_ROOT/etc/ssh/ssh_host_*_key*
{% if sonic_asic_platform == 'broadcom' %}
# Install custom-built flashrom
sudo dpkg --root=$FILESYSTEM_ROOT -i $debs_path/flashrom_*.deb

4
files/sshd/override.conf Normal file
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@ -0,0 +1,4 @@
[Service]
ExecStartPre=
ExecStartPre=/usr/local/bin/host-ssh-keygen.sh
ExecStartPre=/usr/sbin/sshd -t

18
files/sshd/sshd.service
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@ -1,18 +0,0 @@
[Unit]
Description=OpenBSD Secure Shell server
After=network.target auditd.service
ConditionPathExists=!/etc/ssh/sshd_not_to_be_run
[Service]
EnvironmentFile=-/etc/default/ssh
ExecStartPre=-/usr/local/bin/host-ssh-keygen.sh
ExecStart=/usr/sbin/sshd -D $SSHD_OPTS
ExecReload=/bin/kill -HUP $MAINPID
KillMode=process
Restart=on-failure
RuntimeDirectory=sshd
RuntimeDirectoryMode=0755
[Install]
WantedBy=multi-user.target
Alias=sshd.service