dotfiles/roles/user/secrets/hcv/files/vssh.sh

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#!/bin/bash
# create a temporary directory for an SSH key
SSH_KEY_DIR=$(mktemp -d)
# if no path to the key exists, create a temporary one
if [[ $SSH_KEY_PATH == "" ]]; then
SSH_KEY_PATH=$SSH_KEY_DIR/id_ed25519
ssh-keygen -q -t ed25519 -N "" -f $SSH_KEY_PATH
fi
vault ssh \
-no-exec \
-field=signed_key \
-mode=ca \
-role="$VSSH_ROLE" \
-valid-principals="$VSSH_PRINCIPALS" \
-public-key-path=$SSH_KEY_PATH.pub \
-private-key-path=$SSH_KEY_PATH \
localhost > $SSH_KEY_PATH.pub.signed
chmod 400 $SSH_KEY_PATH.pub.signed
# DEBUG
ssh-keygen -L -f $SSH_KEY_PATH.pub.signed
# execute the SSH
ssh -i $SSH_KEY_PATH -i $SSH_KEY_PATH.pub.signed $@
# delete the signed key and temporary key if exists
rm -f $SSH_KEY_PATH.pub.signed
rm -rf $SSH_KEY_DIR