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88 lines
3.2 KiB
Nix
88 lines
3.2 KiB
Nix
# This module defines a systemd service that sets the SSH host key and
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# authorized client key and host name of virtual machines running on
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# Amazon EC2, Eucalyptus and OpenStack Compute (Nova).
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{ config, lib, pkgs, ... }:
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with lib;
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{
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config = {
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systemd.services.apply-ec2-data =
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{ description = "Apply EC2 Data";
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wantedBy = [ "multi-user.target" "sshd.service" ];
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before = [ "sshd.service" ];
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path = [ pkgs.iproute ];
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script =
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''
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${optionalString (config.networking.hostName == "") ''
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echo "setting host name..."
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if [ -s /etc/ec2-metadata/hostname ]; then
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${pkgs.nettools}/bin/hostname $(cat /etc/ec2-metadata/hostname)
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fi
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''}
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if ! [ -e /root/.ssh/authorized_keys ]; then
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echo "obtaining SSH key..."
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mkdir -m 0700 -p /root/.ssh
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if [ -s /etc/ec2-metadata/public-keys-0-openssh-key ]; then
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cat /etc/ec2-metadata/public-keys-0-openssh-key >> /root/.ssh/authorized_keys
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echo "new key added to authorized_keys"
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chmod 600 /root/.ssh/authorized_keys
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fi
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fi
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# Extract the intended SSH host key for this machine from
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# the supplied user data, if available. Otherwise sshd will
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# generate one normally.
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userData=/etc/ec2-metadata/user-data
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mkdir -m 0755 -p /etc/ssh
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if [ -s "$userData" ]; then
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key="$(sed 's/|/\n/g; s/SSH_HOST_DSA_KEY://; t; d' $userData)"
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key_pub="$(sed 's/SSH_HOST_DSA_KEY_PUB://; t; d' $userData)"
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if [ -n "$key" -a -n "$key_pub" -a ! -e /etc/ssh/ssh_host_dsa_key ]; then
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(umask 077; echo "$key" > /etc/ssh/ssh_host_dsa_key)
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echo "$key_pub" > /etc/ssh/ssh_host_dsa_key.pub
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fi
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key="$(sed 's/|/\n/g; s/SSH_HOST_ED25519_KEY://; t; d' $userData)"
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key_pub="$(sed 's/SSH_HOST_ED25519_KEY_PUB://; t; d' $userData)"
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if [ -n "$key" -a -n "$key_pub" -a ! -e /etc/ssh/ssh_host_ed25519_key ]; then
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(umask 077; echo "$key" > /etc/ssh/ssh_host_ed25519_key)
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echo "$key_pub" > /etc/ssh/ssh_host_ed25519_key.pub
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fi
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fi
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'';
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serviceConfig.Type = "oneshot";
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serviceConfig.RemainAfterExit = true;
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};
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systemd.services."print-host-key" =
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{ description = "Print SSH Host Key";
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wantedBy = [ "multi-user.target" ];
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after = [ "sshd.service" ];
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script =
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''
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# Print the host public key on the console so that the user
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# can obtain it securely by parsing the output of
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# ec2-get-console-output.
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echo "-----BEGIN SSH HOST KEY FINGERPRINTS-----" > /dev/console
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for i in /etc/ssh/ssh_host_*_key.pub; do
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${config.programs.ssh.package}/bin/ssh-keygen -l -f $i > /dev/console
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done
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echo "-----END SSH HOST KEY FINGERPRINTS-----" > /dev/console
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'';
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serviceConfig.Type = "oneshot";
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serviceConfig.RemainAfterExit = true;
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};
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};
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}
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