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scw-fetch-ssh-keys: Support users other than root. #229

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scw-fetch-ssh-keys: Support users other than root. #229

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35 changes: 20 additions & 15 deletions bases/overlay-common/usr/local/sbin/scw-fetch-ssh-keys
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Original file line number Diff line number Diff line change
Expand Up @@ -5,20 +5,25 @@

set -e

# ensure /root/.ssh exists and has correct permissions
mkdir -p /root/.ssh
chmod 700 /root/.ssh
ssh_dir="$HOME/.ssh"
authorized_keys="$ssh_dir/authorized_keys"
instance_keys="$ssh_dir/instance_keys"

# ensure /root has the correct permissions
chown root:root /root
chmod 700 /root
# ensure ~ has the correct permissions
chown "$(id -nu):$(id -ng)" "$HOME"
chmod 700 "$HOME"

# ensure ~/.ssh exists and has correct permissions
mkdir -p "$ssh_dir"
chown "$(id -nu):$(id -ng)" "$ssh_dir"
chmod 700 "$ssh_dir"

# `--upgrade` refreshes the metadata cache
if [ "$1" = "--upgrade" ]; then
/usr/local/bin/scw-metadata > /dev/null
fi

cat << EOF > /root/.ssh/authorized_keys
cat << EOF > "$authorized_keys"
#
# WARNING: Automatically generated file
# This file will be erased at every boot
Expand All @@ -30,26 +35,26 @@ cat << EOF > /root/.ssh/authorized_keys
# - i.e: "AUTHORIZED_KEY=ssh-rsa_XXXXXXXXXXX AUTHORIZED_KEY=ssh-rsa_YYYYYYYYYYYYYYY"
# - Be sure to replace all spaces with underscores
# - $> sed 's/ /_/g' ~/.ssh/id_rsa.pub
# -- Add the keys to '/root/.ssh/instance_keys' which will be imported
# -- Add the keys to '~/.ssh/instance_keys' which will be imported
#
# And recreate your 'authorized_keys' file with the new keys:
# -- Run 'scw-fetch-ssh-keys --upgrade'
#
EOF

# add Scaleway account keys
/usr/local/bin/scw-metadata --cached | grep SSH_PUBLIC_KEYS_.*_KEY | cut -d'=' -f 2- | tr -d \' >> /root/.ssh/authorized_keys
/usr/local/bin/scw-metadata --cached | grep SSH_PUBLIC_KEYS_.*_KEY | cut -d'=' -f 2- | tr -d \' >> "$authorized_keys"

# add Server tags keys
/usr/local/bin/scw-metadata --cached | grep TAGS_.*=AUTHORIZED_KEY | cut -d'=' -f 3- | sed 's/_/\ /g' >> /root/.ssh/authorized_keys
/usr/local/bin/scw-metadata --cached | grep TAGS_.*=AUTHORIZED_KEY | cut -d'=' -f 3- | sed 's/_/\ /g' >> "$authorized_keys"

# Import custom keys
if [ -f /root/.ssh/instance_keys ]; then
cat << EOF >> /root/.ssh/authorized_keys
# Below your custom ssh keys from '/root/.ssh/instance_keys'
if [ -f "$instance_keys" ]; then
cat << EOF >> "$authorized_keys"
# Below your custom ssh keys from '$instance_keys'
EOF
(cat /root/.ssh/instance_keys | grep -v "^#" || true) >> /root/.ssh/authorized_keys
(cat "$instance_keys" | grep -v "^#" || true) >> "$authorized_keys"
fi

# authorized_keys should only be readable by the owner and no one else
chmod 0600 /root/.ssh/authorized_keys
chmod 0600 "$authorized_keys"