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#!/usr/bin/env bash
# https://github.com/drduh/YubiKey-Guide/blob/master/scripts/generate.sh
# Generates GnuPG keys and corresponding passphrases to secure them.
#set -x # uncomment to debug
set -o errtrace
set -o nounset
set -o pipefail
umask 077
export LC_ALL="C"
print_cred () {
# Print a credential string in red.
tput setaf 1 ; printf "%s\n" "${1}" ; tput sgr0
}
print_id () {
# Print an identity string in yellow.
tput setaf 3 ; printf "%s\n" "${1}" ; tput sgr0
}
get_id_label () {
# Returns Identity name/label.
printf "YubiKey User <yubikey@example.domain>"
}
get_key_type () {
# Returns key type and size.
printf "rsa2048"
}
get_key_expiration () {
# Returns key expiration date.
printf "2027-05-01"
}
get_temp_dir () {
# Returns temporary working directory path.
mktemp -d -t "$(date +%Y.%m.%d)-XXXX"
}
set_temp_dir () {
# Exports and switches to temporary dir.
export GNUPGHOME="$(get_temp_dir)"
cd "$GNUPGHOME" || exit 1
printf "set temp dir (path='%s')\n" "$(pwd)"
}
set_attrs () {
# Sets identity and key attributes.
export IDENTITY="$(get_id_label)"
export KEY_TYPE="$(get_key_type)"
export KEY_EXPIRATION="$(get_key_expiration)"
printf "set attributes (label='%s', type='%s', expire='%s')\n" \
"$IDENTITY" "$KEY_TYPE" "$KEY_EXPIRATION"
}
get_pass () {
# Returns random passphrase.
tr -dc "A-Z2-9" < /dev/urandom | \
tr -d "IOUS5" | \
fold -w "${PASS_GROUPSIZE:-4}" | \
paste -sd "${PASS_DELIMITER:--}" - | \
head -c "${PASS_LENGTH:-29}"
}
set_pass () {
# Exports Certify and LUKS passphrases.
export CERTIFY_PASS="$(get_pass)"
export ENCRYPT_PASS="$(get_pass)"
printf "set passphrases (certify='%s', encrypt='%s')\n" \
"$CERTIFY_PASS" "$ENCRYPT_PASS"
}
gen_key_certify () {
# Generates Certify key with no expiration.
echo "$CERTIFY_PASS" | \
gpg --batch --passphrase-fd 0 \
--quick-generate-key "$IDENTITY" \
"$KEY_TYPE" "cert" "never"
}
set_id_fp () {
# Sets Key ID and Fingerprint environment vars.
export KEY_ID=$(gpg -k --with-colons "$IDENTITY" | \
awk -F: '/^pub:/ { print $5; exit }')
export KEY_FP=$(gpg -k --with-colons "$IDENTITY" | \
awk -F: '/^fpr:/ { print $10; exit }')
printf "got identity (fp='%s', id='%s')\n" \
"$KEY_FP" "$KEY_ID"
}
gen_key_subs () {
# Generates Subkeys with specified expiration.
for SUBKEY in sign encrypt auth ; do \
echo "$CERTIFY_PASS" | \
gpg --batch --passphrase-fd 0 \
--pinentry-mode=loopback \
--quick-add-key "$KEY_FP" \
"$KEY_TYPE" "$SUBKEY" "$KEY_EXPIRATION"
done
}
save_secrets () {
# Exports secret keys to local files.
export OUTPUT_CERTIFY="$GNUPGHOME/$KEY_ID-Certify.key"
export OUTPUT_SUBKEYS="$GNUPGHOME/$KEY_ID-Subkeys.key"
echo "$CERTIFY_PASS" | \
gpg --output "$OUTPUT_CERTIFY" \
--batch --pinentry-mode=loopback --passphrase-fd 0 \
--armor --export-secret-keys "$KEY_ID"
echo "$CERTIFY_PASS" | \
gpg --output "$OUTPUT_SUBKEYS" \
--batch --pinentry-mode=loopback --passphrase-fd 0 \
--armor --export-secret-subkeys "$KEY_ID"
}
save_pubkey () {
# Exports public key to local file.
export OUTPUT_PUBKEY="$GNUPGHOME/$KEY_ID-Public.asc"
gpg --output "$OUTPUT_PUBKEY" \
--armor --export "$KEY_ID"
}
finish () {
# Prints final message with id and credentials.
printf "\nidentity/key label: "
print_id "$IDENTITY"
printf "key id/fingerprint: "
print_id "$KEY_ID"
print_id "$KEY_FP"
printf "subkeys expiration: "
print_id "$KEY_EXPIRATION"
printf "\nsecrets and pubkey: "
print_id "$GNUPGHOME"
print_id "$OUTPUT_PUBKEY"
printf "\ncertify passphrase: "
print_cred "$CERTIFY_PASS"
printf "encrypt passphrase: "
print_cred "$ENCRYPT_PASS"
exit 0
}
# 1. Set temporary working directory for GnuPG ops.
set_temp_dir
# 2. Set identity and key attributes, such as label and type.
set_attrs
# 3. Set passphrases for identity and storage encryption.
set_pass
# 4. Generate the Certify key.
gen_key_certify
# 5. Set resulting identity fingerprint.
set_id_fp
# 6. Generate the Subkeys.
gen_key_subs
# 7. Export Certify and Subkeys to local storage.
save_secrets
# 8. Export public key to local storage.
save_pubkey
# 9. Print results and exit.
finish
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