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#!/usr/bin/env bash
# Load the SSH key stored in gopass into the gpg-agent.
#
# SSH keys are served by gpg-agent (enable-ssh-support): the private key at
# @@GOPASS_SSH_KEY@@ in the gopass store is added to the agent, so ssh works
# without ever needing a ~/.ssh directory. It runs automatically during every
# home-manager switch and exits early when the agent already holds an identity,
# so the gpg passphrase prompt only appears when it is actually needed.
set -o errexit
set -o nounset
set -o pipefail
export GNUPGHOME="@@GNUPGHOME@@"
GOPASS_SSH_KEY="@@GOPASS_SSH_KEY@@"
info() { printf '\033[1;34m==>\033[0m %s\n' "$*"; }
warn() { printf '\033[1;33m==> warning:\033[0m %s\n' "$*" >&2; }
error() { printf '\033[1;31m==> error:\033[0m %s\n' "$*" >&2; }
die() {
error "$*"
exit 1
}
usage() {
cat <<EOF
Usage: gpg-ssh-key-load [OPTS]
Loads the SSH key stored at "$GOPASS_SSH_KEY" in the gopass store into the
gpg-agent, so ssh uses the gpg-agent without creating a ~/.ssh directory.
Options:
-h, --help Show this help text
EOF
}
while [[ $# -gt 0 ]]; do
case "$1" in
--help | -h)
usage
exit 0
;;
*)
error "Unknown option: $1"
usage
exit 1
;;
esac
done
# Make sure the agent is running and its ssh socket exists.
gpgconf --launch gpg-agent
SSH_AUTH_SOCK="$(gpgconf --list-dirs agent-ssh-socket)"
export SSH_AUTH_SOCK
if [ -z "$SSH_AUTH_SOCK" ] || [ ! -S "$SSH_AUTH_SOCK" ]; then
die "SSH_AUTH_SOCK is not set or valid."
fi
# Already holding an identity, nothing to do.
if ssh-add -l 2>/dev/null | grep -qE "(ED25519|RSA|ECDSA)"; then
exit 0
fi
if ! gopass show -o "$GOPASS_SSH_KEY" >/dev/null 2>&1; then
die "no gopass entry $GOPASS_SSH_KEY"
fi
tmpdir=$(mktemp -d)
trap 'rm -rf "$tmpdir"' EXIT
keyfile="$tmpdir/key"
gopass show -o "$GOPASS_SSH_KEY" >"$keyfile" 2>/dev/null
chmod 600 "$keyfile"
passphrase=$(gopass show -o "$GOPASS_SSH_KEY/passphrase" 2>/dev/null || true)
if [ -n "$passphrase" ]; then
ssh-keygen -p -P "$passphrase" -N "" -f "$keyfile" 2>/dev/null
fi
info "Loading SSH key ($GOPASS_SSH_KEY) into gpg-agent..."
if ! timeout 60 ssh-add "$keyfile"; then
error "Failed to load SSH key into gpg-agent."
error "Run \"ssh-add <(gopass show -o $GOPASS_SSH_KEY)\" manually."
exit 1
fi
info "SSH key loaded into gpg-agent."
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