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* Get the SSH host key from the user data if available. This allows

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the user to create an instance with a known host key, and thus
  permit a secure connection.

svn path=/nixos/trunk/; revision=30242
This commit is contained in:
Eelco Dolstra 2011-11-05 01:44:56 +00:00
parent 3d5f3aa2b4
commit 5e5328cb2e
1 changed files with 22 additions and 4 deletions
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26
modules/virtualisation/ec2-data.nix
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@ -15,11 +15,15 @@ with pkgs.lib;
task = true;
path = [ pkgs.curl ];
script =
''
curl="curl --retry 3 --retry-delay 0 --fail"
echo "setting host name..."
${optionalString (config.networking.hostName == "") ''
${pkgs.nettools}/bin/hostname $(${pkgs.curl}/bin/curl http://169.254.169.254/1.0/meta-data/hostname)
${pkgs.nettools}/bin/hostname $($curl http://169.254.169.254/1.0/meta-data/hostname)
''}
# Don't download the SSH key if it has already been injected
@ -27,9 +31,7 @@ with pkgs.lib;
if ! [ -e /root/.ssh/authorized_keys ]; then
echo "obtaining SSH key..."
mkdir -p /root/.ssh
${pkgs.curl}/bin/curl --retry 3 --retry-delay 0 --fail \
-o /root/key.pub \
http://169.254.169.254/1.0/meta-data/public-keys/0/openssh-key
$curl -o /root/key.pub http://169.254.169.254/1.0/meta-data/public-keys/0/openssh-key
if [ $? -eq 0 -a -e /root/key.pub ]; then
if ! grep -q -f /root/key.pub /root/.ssh/authorized_keys; then
cat /root/key.pub >> /root/.ssh/authorized_keys
@ -39,6 +41,18 @@ with pkgs.lib;
rm -f /root/key.pub
fi
fi
# Extract the intended SSH host key for this machine from
# the supplied user data, if available. Otherwise sshd will
# generate one normally.
$curl http://169.254.169.254/2011-01-01/user-data > /root/user-data || true
key="$(sed 's/|/\n/g; s/SSH_HOST_DSA_KEY://; t; d' /root/user-data)"
key_pub="$(sed 's/SSH_HOST_DSA_KEY_PUB://; t; d' /root/user-data)"
if [ -n "$key" -a -n "$key_pub" -a ! -e /etc/ssh/ssh_host_dsa_key ]; then
mkdir -m 0755 -p /etc/ssh
(umask 077; echo "$key" > /etc/ssh/ssh_host_dsa_key)
echo "$key_pub" > /etc/ssh/ssh_host_dsa_key.pub
fi
'';
};
@ -57,4 +71,8 @@ with pkgs.lib;
'';
};
# Only start sshd after we've obtained the host key (if given in the
# user data), otherwise the sshd job will generate one itself.
jobs.sshd.startOn = mkOverride 90 "stopped fetch-ec2-data";
}