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37 lines
1.3 KiB
Bash
37 lines
1.3 KiB
Bash
#!/usr/bin/env bash
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set -euo pipefail
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WGET() {
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wget --retry-connrefused -t 15 --waitretry=10 --header='Metadata-Flavor: Google' "$@"
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}
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# When dealing with cryptographic keys, we want to keep things private.
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umask 077
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mkdir -p /root/.ssh
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echo "Fetching authorized keys..."
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WGET -O /tmp/auth_keys http://metadata.google.internal/computeMetadata/v1/instance/attributes/sshKeys
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# Read keys one by one, split in case Google decided
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# to append metadata (it does sometimes) and add to
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# authorized_keys if not already present.
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touch /root/.ssh/authorized_keys
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while IFS='' read -r line || [[ -n "$line" ]]; do
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keyLine=$(echo -n "$line" | cut -d ':' -f2)
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IFS=' ' read -r -a array <<<"$keyLine"
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if [[ ${#array[@]} -ge 3 ]]; then
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echo "${array[@]:0:3}" >>/tmp/new_keys
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echo "Added ${array[*]:2} to authorized_keys"
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fi
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done </tmp/auth_keys
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mv /tmp/new_keys /root/.ssh/authorized_keys
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chmod 600 /root/.ssh/authorized_keys
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echo "Fetching host keys..."
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WGET -O /tmp/ssh_host_ed25519_key http://metadata.google.internal/computeMetadata/v1/instance/attributes/ssh_host_ed25519_key
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WGET -O /tmp/ssh_host_ed25519_key.pub http://metadata.google.internal/computeMetadata/v1/instance/attributes/ssh_host_ed25519_key_pub
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mv -f /tmp/ssh_host_ed25519_key* /etc/ssh/
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chmod 600 /etc/ssh/ssh_host_ed25519_key
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chmod 644 /etc/ssh/ssh_host_ed25519_key.pub
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