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GCE-service: Update fetch-ssh-keys API usage

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This commit is contained in:
Mateusz Kowalczyk 2017-05-18 16:59:14 +01:00
parent ef8553ba03
commit a2c900dc87
1 changed files with 26 additions and 43 deletions
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69
nixos/modules/virtualisation/google-compute-image.nix
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@ -20,7 +20,7 @@ in
rm $out/disk.raw
popd
'';
configFile = ./google-compute-config.nix;
configFile = <nixpkgs/nixos/modules/virtualisation/google-compute-config.nix>;
format = "raw";
inherit diskSize;
inherit config lib pkgs;
@ -78,51 +78,34 @@ in
# When dealing with cryptographic keys, we want to keep things private.
umask 077
# Don't download the SSH key if it has already been downloaded
if ! [ -s /root/.ssh/authorized_keys ]; then
echo "obtaining SSH key..."
mkdir -m 0700 -p /root/.ssh
AUTH_KEYS=$(${mktemp})
${wget} -O $AUTH_KEYS http://metadata.google.internal/0.1/meta-data/authorized-keys
if [ -s $AUTH_KEYS ]; then
KEY_PUB=$(${mktemp})
cat $AUTH_KEYS | cut -d: -f2- > $KEY_PUB
if ! grep -q -f $KEY_PUB /root/.ssh/authorized_keys; then
cat $KEY_PUB >> /root/.ssh/authorized_keys
echo "New key added to authorized_keys."
fi
chmod 600 /root/.ssh/authorized_keys
rm -f $KEY_PUB
else
echo "Downloading http://metadata.google.internal/0.1/meta-data/authorized-keys failed."
false
fi
rm -f $AUTH_KEYS
fi
echo "Obtaining SSH keys..."
mkdir -m 0700 -p /root/.ssh
AUTH_KEYS=$(${mktemp})
${wget} -O $AUTH_KEYS http://metadata.google.internal/computeMetadata/v1/project/attributes/sshKeys
if [ -s $AUTH_KEYS ]; then
countKeys=0
${flip concatMapStrings config.services.openssh.hostKeys (k :
let kName = baseNameOf k.path; in ''
PRIV_KEY=$(${mktemp})
echo "trying to obtain SSH private host key ${kName}"
${wget} -O $PRIV_KEY http://metadata.google.internal/0.1/meta-data/attributes/${kName} && :
if [ $? -eq 0 -a -s $PRIV_KEY ]; then
countKeys=$((countKeys+1))
mv -f $PRIV_KEY ${k.path}
echo "Downloaded ${k.path}"
chmod 600 ${k.path}
${config.programs.ssh.package}/bin/ssh-keygen -y -f ${k.path} > ${k.path}.pub
chmod 644 ${k.path}.pub
else
echo "Downloading http://metadata.google.internal/0.1/meta-data/attributes/${kName} failed."
# Read in key one by one, split in case Google decided
# to append metadata (it does sometimes) and add to
# authorized_keys if not already present.
touch /root/.ssh/authorized_keys
NEW_KEYS=$(${mktemp})
# Yes this is a nix escape of two single quotes.
while IFS=''' read -r line || [[ -n "$line" ]]; do
keyLine=$(echo -n "$line" | cut -d ':' -f2)
IFS=' ' read -r -a array <<< "$keyLine"
if [ ''${#array[@]} -ge 3 ]; then
echo ''${array[@]:0:3} >> $NEW_KEYS
echo "Added ''${array[@]:2} to authorized_keys"
fi
rm -f $PRIV_KEY
''
)}
if [[ $countKeys -le 0 ]]; then
echo "failed to obtain any SSH private host keys."
false
done < $AUTH_KEYS
mv $NEW_KEYS /root/.ssh/authorized_keys
chmod 600 /root/.ssh/authorized_keys
rm -f $KEY_PUB
else
echo "Downloading http://metadata.google.internal/computeMetadata/v1/project/attributes/sshKeys failed."
false
fi
rm -f $AUTH_KEYS
'';
serviceConfig.Type = "oneshot";
serviceConfig.RemainAfterExit = true;