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61 lines
1.9 KiB
Nix
61 lines
1.9 KiB
Nix
# This module defines an Upstart job that obtains the SSH key and host
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# name of virtual machines running on Amazon EC2, Eucalyptus and
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# OpenStack Compute (Nova).
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{ config, pkgs, ... }:
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with pkgs.lib;
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{
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jobs.fetchEC2Data =
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{ name = "fetch-ec2-data";
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startOn = "ip-up";
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task = true;
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script =
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''
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echo "setting host name..."
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${optionalString (config.networking.hostName == "") ''
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${pkgs.nettools}/bin/hostname $(${pkgs.curl}/bin/curl http://169.254.169.254/1.0/meta-data/hostname)
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''}
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# Don't download the SSH key if it has already been injected
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# into the image (a Nova feature).
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if ! [ -e /root/.ssh/authorized_keys ]; then
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echo "obtaining SSH key..."
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mkdir -p /root/.ssh
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${pkgs.curl}/bin/curl --retry 3 --retry-delay 0 --fail \
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-o /root/key.pub \
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http://169.254.169.254/1.0/meta-data/public-keys/0/openssh-key
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if [ $? -eq 0 -a -e /root/key.pub ]; then
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if ! grep -q -f /root/key.pub /root/.ssh/authorized_keys; then
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cat /root/key.pub >> /root/.ssh/authorized_keys
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echo "new key added to authorized_keys"
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fi
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chmod 600 /root/.ssh/authorized_keys
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rm -f /root/key.pub
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fi
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fi
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'';
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};
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jobs.printHostKey =
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{ name = "print-host-key";
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task = true;
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startOn = "started sshd";
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script =
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''
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# Print the host public key on the console so that the user
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# can obtain it securely by parsing the output of
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# ec2-get-console-output.
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echo "-----BEGIN SSH HOST KEY FINGERPRINTS-----" > /dev/console
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${pkgs.openssh}/bin/ssh-keygen -l -f /etc/ssh/ssh_host_dsa_key.pub > /dev/console
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echo "-----END SSH HOST KEY FINGERPRINTS-----" > /dev/console
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'';
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};
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}
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