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letsencrypt.sh
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letsencrypt.sh
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#!/usr/bin/env bash
# letsencrypt.sh by lukas2511
# Source: https://github.com/lukas2511/letsencrypt.sh
#
# This script is licensed under The MIT License (see LICENSE for more information).
set -e
set -u
set -o pipefail
[[ -n "${ZSH_VERSION:-}" ]] && set -o SH_WORD_SPLIT && set +o FUNCTION_ARGZERO
umask 077 # paranoid umask, we're creating private keys
# Find directory in which this script is stored by traversing all symbolic links
SOURCE="${0}"
while [ -h "$SOURCE" ]; do # resolve $SOURCE until the file is no longer a symlink
DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
SOURCE="$(readlink "$SOURCE")"
[[ $SOURCE != /* ]] && SOURCE="$DIR/$SOURCE" # if $SOURCE was a relative symlink, we need to resolve it relative to the path where the symlink file was located
done
SCRIPTDIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
BASEDIR="${SCRIPTDIR}"
# Create (identifiable) temporary files
_mktemp() {
# shellcheck disable=SC2068
mktemp ${@:-} "${TMPDIR:-/tmp}/letsencrypt.sh-XXXXXX"
}
# Check for script dependencies
check_dependencies() {
# just execute some dummy and/or version commands to see if required tools exist and are actually usable
openssl version > /dev/null 2>&1 || _exiterr "This script requires an openssl binary."
_sed "" < /dev/null > /dev/null 2>&1 || _exiterr "This script requires sed with support for extended (modern) regular expressions."
command -v grep > /dev/null 2>&1 || _exiterr "This script requires grep."
_mktemp -u > /dev/null 2>&1 || _exiterr "This script requires mktemp."
diff -u /dev/null /dev/null || _exiterr "This script requires diff."
# curl returns with an error code in some ancient versions so we have to catch that
set +e
curl -V > /dev/null 2>&1
retcode="$?"
set -e
if [[ ! "${retcode}" = "0" ]] && [[ ! "${retcode}" = "2" ]]; then
_exiterr "This script requires curl."
fi
}
store_configvars() {
__KEY_ALGO="${KEY_ALGO}"
__OCSP_MUST_STAPLE="${OCSP_MUST_STAPLE}"
__PRIVATE_KEY_RENEW="${PRIVATE_KEY_RENEW}"
__KEYSIZE="${KEYSIZE}"
__CHALLENGETYPE="${CHALLENGETYPE}"
__HOOK="${HOOK}"
__WELLKNOWN="${WELLKNOWN}"
__HOOK_CHAIN="${HOOK_CHAIN}"
__OPENSSL_CNF="${OPENSSL_CNF}"
__RENEW_DAYS="${RENEW_DAYS}"
}
reset_configvars() {
KEY_ALGO="${__KEY_ALGO}"
OCSP_MUST_STAPLE="${__OCSP_MUST_STAPLE}"
PRIVATE_KEY_RENEW="${__PRIVATE_KEY_RENEW}"
KEYSIZE="${__KEYSIZE}"
CHALLENGETYPE="${__CHALLENGETYPE}"
HOOK="${__HOOK}"
WELLKNOWN="${__WELLKNOWN}"
HOOK_CHAIN="${__HOOK_CHAIN}"
OPENSSL_CNF="${__OPENSSL_CNF}"
RENEW_DAYS="${__RENEW_DAYS}"
}
# verify configuration values
verify_config() {
[[ "${CHALLENGETYPE}" =~ (http-01|dns-01) ]] || _exiterr "Unknown challenge type ${CHALLENGETYPE}... can not continue."
if [[ "${CHALLENGETYPE}" = "dns-01" ]] && [[ -z "${HOOK}" ]]; then
_exiterr "Challenge type dns-01 needs a hook script for deployment... can not continue."
fi
if [[ "${CHALLENGETYPE}" = "http-01" && ! -d "${WELLKNOWN}" ]]; then
_exiterr "WELLKNOWN directory doesn't exist, please create ${WELLKNOWN} and set appropriate permissions."
fi
[[ "${KEY_ALGO}" =~ ^(rsa|prime256v1|secp384r1)$ ]] || _exiterr "Unknown public key algorithm ${KEY_ALGO}... can not continue."
}
# Setup default config values, search for and load configuration files
load_config() {
# Check for config in various locations
if [[ -z "${CONFIG:-}" ]]; then
for check_config in "/etc/letsencrypt.sh" "/usr/local/etc/letsencrypt.sh" "${PWD}" "${SCRIPTDIR}"; do
if [[ -f "${check_config}/config" ]]; then
BASEDIR="${check_config}"
CONFIG="${check_config}/config"
break
fi
done
fi
# Default values
CA="https://acme-v01.api.letsencrypt.org/directory"
LICENSE="https://letsencrypt.org/documents/LE-SA-v1.0.1-July-27-2015.pdf"
CERTDIR=
ACCOUNTDIR=
CHALLENGETYPE="http-01"
CONFIG_D=
DOMAINS_D=
DOMAINS_TXT=
HOOK=
HOOK_CHAIN="no"
RENEW_DAYS="30"
KEYSIZE="4096"
WELLKNOWN=
PRIVATE_KEY_RENEW="yes"
KEY_ALGO=rsa
OPENSSL_CNF="$(openssl version -d | cut -d\" -f2)/openssl.cnf"
CONTACT_EMAIL=
LOCKFILE=
OCSP_MUST_STAPLE="no"
if [[ -z "${CONFIG:-}" ]]; then
echo "#" >&2
echo "# !! WARNING !! No main config file found, using default config!" >&2
echo "#" >&2
elif [[ -f "${CONFIG}" ]]; then
echo "# INFO: Using main config file ${CONFIG}"
BASEDIR="$(dirname "${CONFIG}")"
# shellcheck disable=SC1090
. "${CONFIG}"
else
_exiterr "Specified config file doesn't exist."
fi
if [[ -n "${CONFIG_D}" ]]; then
if [[ ! -d "${CONFIG_D}" ]]; then
_exiterr "The path ${CONFIG_D} specified for CONFIG_D does not point to a directory." >&2
fi
for check_config_d in "${CONFIG_D}"/*.sh; do
if [[ ! -e "${check_config_d}" ]]; then
echo "# !! WARNING !! Extra configuration directory ${CONFIG_D} exists, but no configuration found in it." >&2
break
elif [[ -f "${check_config_d}" ]] && [[ -r "${check_config_d}" ]]; then
echo "# INFO: Using additional config file ${check_config_d}"
# shellcheck disable=SC1090
. "${check_config_d}"
else
_exiterr "Specified additional config ${check_config_d} is not readable or not a file at all." >&2
fi
done
fi
# Remove slash from end of BASEDIR. Mostly for cleaner outputs, doesn't change functionality.
BASEDIR="${BASEDIR%%/}"
# Check BASEDIR and set default variables
[[ -d "${BASEDIR}" ]] || _exiterr "BASEDIR does not exist: ${BASEDIR}"
CAHASH="$(echo "${CA}" | urlbase64)"
[[ -z "${ACCOUNTDIR}" ]] && ACCOUNTDIR="${BASEDIR}/accounts"
mkdir -p "${ACCOUNTDIR}/${CAHASH}"
[[ -f "${ACCOUNTDIR}/${CAHASH}/config" ]] && . "${ACCOUNTDIR}/${CAHASH}/config"
ACCOUNT_KEY="${ACCOUNTDIR}/${CAHASH}/account_key.pem"
ACCOUNT_KEY_JSON="${ACCOUNTDIR}/${CAHASH}/registration_info.json"
if [[ -f "${BASEDIR}/private_key.pem" ]] && [[ ! -f "${ACCOUNT_KEY}" ]]; then
echo "! Moving private_key.pem to ${ACCOUNT_KEY}"
mv "${BASEDIR}/private_key.pem" "${ACCOUNT_KEY}"
fi
if [[ -f "${BASEDIR}/private_key.json" ]] && [[ ! -f "${ACCOUNT_KEY_JSON}" ]]; then
echo "! Moving private_key.json to ${ACCOUNT_KEY_JSON}"
mv "${BASEDIR}/private_key.json" "${ACCOUNT_KEY_JSON}"
fi
[[ -z "${CERTDIR}" ]] && CERTDIR="${BASEDIR}/certs"
[[ -z "${DOMAINS_TXT}" ]] && DOMAINS_TXT="${BASEDIR}/domains.txt"
[[ -z "${WELLKNOWN}" ]] && WELLKNOWN="${BASEDIR}/.acme-challenges"
[[ -z "${LOCKFILE}" ]] && LOCKFILE="${BASEDIR}/lock"
[[ -n "${PARAM_HOOK:-}" ]] && HOOK="${PARAM_HOOK}"
[[ -n "${PARAM_CERTDIR:-}" ]] && CERTDIR="${PARAM_CERTDIR}"
[[ -n "${PARAM_CHALLENGETYPE:-}" ]] && CHALLENGETYPE="${PARAM_CHALLENGETYPE}"
[[ -n "${PARAM_KEY_ALGO:-}" ]] && KEY_ALGO="${PARAM_KEY_ALGO}"
[[ -n "${PARAM_OCSP_MUST_STAPLE:-}" ]] && OCSP_MUST_STAPLE="${PARAM_OCSP_MUST_STAPLE}"
verify_config
store_configvars
}
# Initialize system
init_system() {
load_config
# Lockfile handling (prevents concurrent access)
LOCKDIR="$(dirname "${LOCKFILE}")"
[[ -w "${LOCKDIR}" ]] || _exiterr "Directory ${LOCKDIR} for LOCKFILE ${LOCKFILE} is not writable, aborting."
( set -C; date > "${LOCKFILE}" ) 2>/dev/null || _exiterr "Lock file '${LOCKFILE}' present, aborting."
remove_lock() { rm -f "${LOCKFILE}"; }
trap 'remove_lock' EXIT
# Get CA URLs
CA_DIRECTORY="$(http_request get "${CA}")"
CA_NEW_CERT="$(printf "%s" "${CA_DIRECTORY}" | get_json_string_value new-cert)" &&
CA_NEW_AUTHZ="$(printf "%s" "${CA_DIRECTORY}" | get_json_string_value new-authz)" &&
CA_NEW_REG="$(printf "%s" "${CA_DIRECTORY}" | get_json_string_value new-reg)" &&
# shellcheck disable=SC2015
CA_REVOKE_CERT="$(printf "%s" "${CA_DIRECTORY}" | get_json_string_value revoke-cert)" ||
_exiterr "Problem retrieving ACME/CA-URLs, check if your configured CA points to the directory entrypoint."
# Export some environment variables to be used in hook script
export WELLKNOWN BASEDIR CERTDIR CONFIG
# Checking for private key ...
register_new_key="no"
if [[ -n "${PARAM_ACCOUNT_KEY:-}" ]]; then
# a private key was specified from the command line so use it for this run
echo "Using private key ${PARAM_ACCOUNT_KEY} instead of account key"
ACCOUNT_KEY="${PARAM_ACCOUNT_KEY}"
ACCOUNT_KEY_JSON="${PARAM_ACCOUNT_KEY}.json"
else
# Check if private account key exists, if it doesn't exist yet generate a new one (rsa key)
if [[ ! -e "${ACCOUNT_KEY}" ]]; then
echo "+ Generating account key..."
_openssl genrsa -out "${ACCOUNT_KEY}" "${KEYSIZE}"
register_new_key="yes"
fi
fi
openssl rsa -in "${ACCOUNT_KEY}" -check 2>/dev/null > /dev/null || _exiterr "Account key is not valid, can not continue."
# Get public components from private key and calculate thumbprint
pubExponent64="$(printf '%x' "$(openssl rsa -in "${ACCOUNT_KEY}" -noout -text | awk '/publicExponent/ {print $2}')" | hex2bin | urlbase64)"
pubMod64="$(openssl rsa -in "${ACCOUNT_KEY}" -noout -modulus | cut -d'=' -f2 | hex2bin | urlbase64)"
thumbprint="$(printf '{"e":"%s","kty":"RSA","n":"%s"}' "${pubExponent64}" "${pubMod64}" | openssl dgst -sha256 -binary | urlbase64)"
# If we generated a new private key in the step above we have to register it with the acme-server
if [[ "${register_new_key}" = "yes" ]]; then
echo "+ Registering account key with letsencrypt..."
[[ ! -z "${CA_NEW_REG}" ]] || _exiterr "Certificate authority doesn't allow registrations."
# If an email for the contact has been provided then adding it to the registration request
FAILED=false
if [[ -n "${CONTACT_EMAIL}" ]]; then
(signed_request "${CA_NEW_REG}" '{"resource": "new-reg", "contact":["mailto:'"${CONTACT_EMAIL}"'"], "agreement": "'"$LICENSE"'"}' > "${ACCOUNT_KEY_JSON}") || FAILED=true
else
(signed_request "${CA_NEW_REG}" '{"resource": "new-reg", "agreement": "'"$LICENSE"'"}' > "${ACCOUNT_KEY_JSON}") || FAILED=true
fi
if [[ "${FAILED}" = "true" ]]; then
echo
echo
echo "Error registering account key. See message above for more information."
rm "${ACCOUNT_KEY}" "${ACCOUNT_KEY_JSON}"
exit 1
fi
fi
}
# Different sed version for different os types...
_sed() {
if [[ "${OSTYPE}" = "Linux" ]]; then
sed -r "${@}"
else
sed -E "${@}"
fi
}
# Print error message and exit with error
_exiterr() {
echo "ERROR: ${1}" >&2
exit 1
}
# Remove newlines and whitespace from json
clean_json() {
tr -d '\r\n' | _sed -e 's/ +/ /g' -e 's/\{ /{/g' -e 's/ \}/}/g' -e 's/\[ /[/g' -e 's/ \]/]/g'
}
# Encode data as url-safe formatted base64
urlbase64() {
# urlbase64: base64 encoded string with '+' replaced with '-' and '/' replaced with '_'
openssl base64 -e | tr -d '\n\r' | _sed -e 's:=*$::g' -e 'y:+/:-_:'
}
# Convert hex string to binary data
hex2bin() {
# Remove spaces, add leading zero, escape as hex string and parse with printf
printf -- "$(cat | _sed -e 's/[[:space:]]//g' -e 's/^(.(.{2})*)$/0\1/' -e 's/(.{2})/\\x\1/g')"
}
# Get string value from json dictionary
get_json_string_value() {
local filter
filter=$(printf 's/.*"%s": *"\([^"]*\)".*/\\1/p' "$1")
sed -n "${filter}"
}
# OpenSSL writes to stderr/stdout even when there are no errors. So just
# display the output if the exit code was != 0 to simplify debugging.
_openssl() {
set +e
out="$(openssl "${@}" 2>&1)"
res=$?
set -e
if [[ ${res} -ne 0 ]]; then
echo " + ERROR: failed to run $* (Exitcode: ${res})" >&2
echo >&2
echo "Details:" >&2
echo "${out}" >&2
echo >&2
exit ${res}
fi
}
# Send http(s) request with specified method
http_request() {
tempcont="$(_mktemp)"
set +e
if [[ "${1}" = "head" ]]; then
statuscode="$(curl -s -w "%{http_code}" -o "${tempcont}" "${2}" -I)"
curlret="${?}"
elif [[ "${1}" = "get" ]]; then
statuscode="$(curl -s -w "%{http_code}" -o "${tempcont}" "${2}")"
curlret="${?}"
elif [[ "${1}" = "post" ]]; then
statuscode="$(curl -s -w "%{http_code}" -o "${tempcont}" "${2}" -d "${3}")"
curlret="${?}"
else
set -e
_exiterr "Unknown request method: ${1}"
fi
set -e
if [[ ! "${curlret}" = "0" ]]; then
_exiterr "Problem connecting to server (${1} for ${2}; curl returned with ${curlret})"
fi
if [[ ! "${statuscode:0:1}" = "2" ]]; then
echo " + ERROR: An error occurred while sending ${1}-request to ${2} (Status ${statuscode})" >&2
echo >&2
echo "Details:" >&2
cat "${tempcont}" >&2
rm -f "${tempcont}"
# Wait for hook script to clean the challenge if used
if [[ -n "${HOOK}" ]] && [[ "${HOOK_CHAIN}" != "yes" ]] && [[ -n "${challenge_token:+set}" ]]; then
"${HOOK}" "clean_challenge" '' "${challenge_token}" "${keyauth}"
fi
# remove temporary domains.txt file if used
[[ -n "${PARAM_DOMAIN:-}" && -n "${DOMAINS_TXT:-}" ]] && rm "${DOMAINS_TXT}"
exit 1
fi
cat "${tempcont}"
rm -f "${tempcont}"
}
# Send signed request
signed_request() {
# Encode payload as urlbase64
payload64="$(printf '%s' "${2}" | urlbase64)"
# Retrieve nonce from acme-server
nonce="$(http_request head "${CA}" | grep Replay-Nonce: | awk -F ': ' '{print $2}' | tr -d '\n\r')"
# Build header with just our public key and algorithm information
header='{"alg": "RS256", "jwk": {"e": "'"${pubExponent64}"'", "kty": "RSA", "n": "'"${pubMod64}"'"}}'
# Build another header which also contains the previously received nonce and encode it as urlbase64
protected='{"alg": "RS256", "jwk": {"e": "'"${pubExponent64}"'", "kty": "RSA", "n": "'"${pubMod64}"'"}, "nonce": "'"${nonce}"'"}'
protected64="$(printf '%s' "${protected}" | urlbase64)"
# Sign header with nonce and our payload with our private key and encode signature as urlbase64
signed64="$(printf '%s' "${protected64}.${payload64}" | openssl dgst -sha256 -sign "${ACCOUNT_KEY}" | urlbase64)"
# Send header + extended header + payload + signature to the acme-server
data='{"header": '"${header}"', "protected": "'"${protected64}"'", "payload": "'"${payload64}"'", "signature": "'"${signed64}"'"}'
http_request post "${1}" "${data}"
}
# Extracts all subject names from a CSR
# Outputs either the CN, or the SANs, one per line
extract_altnames() {
csr="${1}" # the CSR itself (not a file)
if ! <<<"${csr}" openssl req -verify -noout 2>/dev/null; then
_exiterr "Certificate signing request isn't valid"
fi
reqtext="$( <<<"${csr}" openssl req -noout -text )"
if <<<"${reqtext}" grep -q '^[[:space:]]*X509v3 Subject Alternative Name:[[:space:]]*$'; then
# SANs used, extract these
altnames="$( <<<"${reqtext}" grep -A1 '^[[:space:]]*X509v3 Subject Alternative Name:[[:space:]]*$' | tail -n1 )"
# split to one per line:
# shellcheck disable=SC1003
altnames="$( <<<"${altnames}" _sed -e 's/^[[:space:]]*//; s/, /\'$'\n''/g' )"
# we can only get DNS: ones signed
if grep -qv '^DNS:' <<<"${altnames}"; then
_exiterr "Certificate signing request contains non-DNS Subject Alternative Names"
fi
# strip away the DNS: prefix
altnames="$( <<<"${altnames}" _sed -e 's/^DNS://' )"
echo "${altnames}"
else
# No SANs, extract CN
altnames="$( <<<"${reqtext}" grep '^[[:space:]]*Subject:' | _sed -e 's/.* CN=([^ /,]*).*/\1/' )"
echo "${altnames}"
fi
}
# Create certificate for domain(s) and outputs it FD 3
sign_csr() {
csr="${1}" # the CSR itself (not a file)
if { true >&3; } 2>/dev/null; then
: # fd 3 looks OK
else
_exiterr "sign_csr: FD 3 not open"
fi
shift 1 || true
altnames="${*:-}"
if [ -z "${altnames}" ]; then
altnames="$( extract_altnames "${csr}" )"
fi
if [[ -z "${CA_NEW_AUTHZ}" ]] || [[ -z "${CA_NEW_CERT}" ]]; then
_exiterr "Certificate authority doesn't allow certificate signing"
fi
local idx=0
if [[ -n "${ZSH_VERSION:-}" ]]; then
local -A challenge_uris challenge_tokens keyauths deploy_args
else
local -a challenge_uris challenge_tokens keyauths deploy_args
fi
# Request challenges
for altname in ${altnames}; do
# Ask the acme-server for new challenge token and extract them from the resulting json block
echo " + Requesting challenge for ${altname}..."
response="$(signed_request "${CA_NEW_AUTHZ}" '{"resource": "new-authz", "identifier": {"type": "dns", "value": "'"${altname}"'"}}' | clean_json)"
challenges="$(printf '%s\n' "${response}" | sed -n 's/.*\("challenges":[^\[]*\[[^]]*]\).*/\1/p')"
repl=$'\n''{' # fix syntax highlighting in Vim
challenge="$(printf "%s" "${challenges//\{/${repl}}" | grep \""${CHALLENGETYPE}"\")"
challenge_token="$(printf '%s' "${challenge}" | get_json_string_value token | _sed 's/[^A-Za-z0-9_\-]/_/g')"
challenge_uri="$(printf '%s' "${challenge}" | get_json_string_value uri)"
if [[ -z "${challenge_token}" ]] || [[ -z "${challenge_uri}" ]]; then
_exiterr "Can't retrieve challenges (${response})"
fi
# Challenge response consists of the challenge token and the thumbprint of our public certificate
keyauth="${challenge_token}.${thumbprint}"
case "${CHALLENGETYPE}" in
"http-01")
# Store challenge response in well-known location and make world-readable (so that a webserver can access it)
printf '%s' "${keyauth}" > "${WELLKNOWN}/${challenge_token}"
chmod a+r "${WELLKNOWN}/${challenge_token}"
keyauth_hook="${keyauth}"
;;
"dns-01")
# Generate DNS entry content for dns-01 validation
keyauth_hook="$(printf '%s' "${keyauth}" | openssl dgst -sha256 -binary | urlbase64)"
;;
esac
challenge_uris[${idx}]="${challenge_uri}"
keyauths[${idx}]="${keyauth}"
challenge_tokens[${idx}]="${challenge_token}"
# Note: assumes args will never have spaces!
deploy_args[${idx}]="${altname} ${challenge_token} ${keyauth_hook}"
idx=$((idx+1))
done
# Wait for hook script to deploy the challenges if used
# shellcheck disable=SC2068
[[ -n "${HOOK}" ]] && [[ "${HOOK_CHAIN}" = "yes" ]] && "${HOOK}" "deploy_challenge" ${deploy_args[@]}
# Respond to challenges
idx=0
for altname in ${altnames}; do
challenge_token="${challenge_tokens[${idx}]}"
keyauth="${keyauths[${idx}]}"
# Wait for hook script to deploy the challenge if used
# shellcheck disable=SC2086
[[ -n "${HOOK}" ]] && [[ "${HOOK_CHAIN}" != "yes" ]] && "${HOOK}" "deploy_challenge" ${deploy_args[${idx}]}
# Ask the acme-server to verify our challenge and wait until it is no longer pending
echo " + Responding to challenge for ${altname}..."
result="$(signed_request "${challenge_uris[${idx}]}" '{"resource": "challenge", "keyAuthorization": "'"${keyauth}"'"}' | clean_json)"
reqstatus="$(printf '%s\n' "${result}" | get_json_string_value status)"
while [[ "${reqstatus}" = "pending" ]]; do
sleep 1
result="$(http_request get "${challenge_uris[${idx}]}")"
reqstatus="$(printf '%s\n' "${result}" | get_json_string_value status)"
done
[[ "${CHALLENGETYPE}" = "http-01" ]] && rm -f "${WELLKNOWN}/${challenge_token}"
# Wait for hook script to clean the challenge if used
if [[ -n "${HOOK}" ]] && [[ "${HOOK_CHAIN}" != "yes" ]] && [[ -n "${challenge_token}" ]]; then
# shellcheck disable=SC2086
"${HOOK}" "clean_challenge" ${deploy_args[${idx}]}
fi
idx=$((idx+1))
if [[ "${reqstatus}" = "valid" ]]; then
echo " + Challenge is valid!"
else
break
fi
done
# Wait for hook script to clean the challenges if used
# shellcheck disable=SC2068
[[ -n "${HOOK}" ]] && [[ "${HOOK_CHAIN}" = "yes" ]] && "${HOOK}" "clean_challenge" ${deploy_args[@]}
if [[ "${reqstatus}" != "valid" ]]; then
# Clean up any remaining challenge_tokens if we stopped early
if [[ "${CHALLENGETYPE}" = "http-01" ]]; then
while [ ${idx} -lt ${#challenge_tokens[@]} ]; do
rm -f "${WELLKNOWN}/${challenge_tokens[${idx}]}"
idx=$((idx+1))
done
fi
_exiterr "Challenge is invalid! (returned: ${reqstatus}) (result: ${result})"
fi
# Finally request certificate from the acme-server and store it in cert-${timestamp}.pem and link from cert.pem
echo " + Requesting certificate..."
csr64="$( <<<"${csr}" openssl req -outform DER | urlbase64)"
crt64="$(signed_request "${CA_NEW_CERT}" '{"resource": "new-cert", "csr": "'"${csr64}"'"}' | openssl base64 -e)"
crt="$( printf -- '-----BEGIN CERTIFICATE-----\n%s\n-----END CERTIFICATE-----\n' "${crt64}" )"
# Try to load the certificate to detect corruption
echo " + Checking certificate..."
_openssl x509 -text <<<"${crt}"
echo "${crt}" >&3
unset challenge_token
echo " + Done!"
}
# Create certificate for domain(s)
sign_domain() {
domain="${1}"
altnames="${*}"
timestamp="$(date +%s)"
echo " + Signing domains..."
if [[ -z "${CA_NEW_AUTHZ}" ]] || [[ -z "${CA_NEW_CERT}" ]]; then
_exiterr "Certificate authority doesn't allow certificate signing"
fi
# If there is no existing certificate directory => make it
if [[ ! -e "${CERTDIR}/${domain}" ]]; then
echo " + Creating new directory ${CERTDIR}/${domain} ..."
mkdir -p "${CERTDIR}/${domain}" || _exiterr "Unable to create directory ${CERTDIR}/${domain}"
fi
privkey="privkey.pem"
# generate a new private key if we need or want one
if [[ ! -r "${CERTDIR}/${domain}/privkey.pem" ]] || [[ "${PRIVATE_KEY_RENEW}" = "yes" ]]; then
echo " + Generating private key..."
privkey="privkey-${timestamp}.pem"
case "${KEY_ALGO}" in
rsa) _openssl genrsa -out "${CERTDIR}/${domain}/privkey-${timestamp}.pem" "${KEYSIZE}";;
prime256v1|secp384r1) _openssl ecparam -genkey -name "${KEY_ALGO}" -out "${CERTDIR}/${domain}/privkey-${timestamp}.pem";;
esac
fi
# Generate signing request config and the actual signing request
echo " + Generating signing request..."
SAN=""
for altname in ${altnames}; do
SAN+="DNS:${altname}, "
done
SAN="${SAN%%, }"
local tmp_openssl_cnf
tmp_openssl_cnf="$(_mktemp)"
cat "${OPENSSL_CNF}" > "${tmp_openssl_cnf}"
printf "[SAN]\nsubjectAltName=%s" "${SAN}" >> "${tmp_openssl_cnf}"
if [ "${OCSP_MUST_STAPLE}" = "yes" ]; then
printf "\n1.3.6.1.5.5.7.1.24=DER:30:03:02:01:05" >> "${tmp_openssl_cnf}"
fi
openssl req -new -sha256 -key "${CERTDIR}/${domain}/${privkey}" -out "${CERTDIR}/${domain}/cert-${timestamp}.csr" -subj "/CN=${domain}/" -reqexts SAN -config "${tmp_openssl_cnf}"
rm -f "${tmp_openssl_cnf}"
crt_path="${CERTDIR}/${domain}/cert-${timestamp}.pem"
# shellcheck disable=SC2086
sign_csr "$(< "${CERTDIR}/${domain}/cert-${timestamp}.csr" )" ${altnames} 3>"${crt_path}"
# Create fullchain.pem
echo " + Creating fullchain.pem..."
cat "${crt_path}" > "${CERTDIR}/${domain}/fullchain-${timestamp}.pem"
http_request get "$(openssl x509 -in "${CERTDIR}/${domain}/cert-${timestamp}.pem" -noout -text | grep 'CA Issuers - URI:' | cut -d':' -f2-)" > "${CERTDIR}/${domain}/chain-${timestamp}.pem"
if ! grep -q "BEGIN CERTIFICATE" "${CERTDIR}/${domain}/chain-${timestamp}.pem"; then
openssl x509 -in "${CERTDIR}/${domain}/chain-${timestamp}.pem" -inform DER -out "${CERTDIR}/${domain}/chain-${timestamp}.pem" -outform PEM
fi
cat "${CERTDIR}/${domain}/chain-${timestamp}.pem" >> "${CERTDIR}/${domain}/fullchain-${timestamp}.pem"
# Update symlinks
[[ "${privkey}" = "privkey.pem" ]] || ln -sf "privkey-${timestamp}.pem" "${CERTDIR}/${domain}/privkey.pem"
ln -sf "chain-${timestamp}.pem" "${CERTDIR}/${domain}/chain.pem"
ln -sf "fullchain-${timestamp}.pem" "${CERTDIR}/${domain}/fullchain.pem"
ln -sf "cert-${timestamp}.csr" "${CERTDIR}/${domain}/cert.csr"
ln -sf "cert-${timestamp}.pem" "${CERTDIR}/${domain}/cert.pem"
# Wait for hook script to clean the challenge and to deploy cert if used
export KEY_ALGO
[[ -n "${HOOK}" ]] && "${HOOK}" "deploy_cert" "${domain}" "${CERTDIR}/${domain}/privkey.pem" "${CERTDIR}/${domain}/cert.pem" "${CERTDIR}/${domain}/fullchain.pem" "${CERTDIR}/${domain}/chain.pem" "${timestamp}"
unset challenge_token
echo " + Done!"
}
# Usage: --cron (-c)
# Description: Sign/renew non-existant/changed/expiring certificates.
command_sign_domains() {
init_system
if [[ -n "${PARAM_DOMAIN:-}" ]]; then
DOMAINS_TXT="$(_mktemp)"
printf -- "${PARAM_DOMAIN}" > "${DOMAINS_TXT}"
elif [[ -e "${DOMAINS_TXT}" ]]; then
if [[ ! -r "${DOMAINS_TXT}" ]]; then
_exiterr "domains.txt found but not readable"
fi
else
_exiterr "domains.txt not found and --domain not given"
fi
# Generate certificates for all domains found in domains.txt. Check if existing certificate are about to expire
ORIGIFS="${IFS}"
IFS=$'\n'
for line in $(<"${DOMAINS_TXT}" tr -d '\r' | tr '[:upper:]' '[:lower:]' | _sed -e 's/^[[:space:]]*//g' -e 's/[[:space:]]*$//g' -e 's/[[:space:]]+/ /g' | (grep -vE '^(#|$)' || true)); do
reset_configvars
IFS="${ORIGIFS}"
domain="$(printf '%s\n' "${line}" | cut -d' ' -f1)"
morenames="$(printf '%s\n' "${line}" | cut -s -d' ' -f2-)"
cert="${CERTDIR}/${domain}/cert.pem"
force_renew="${PARAM_FORCE:-no}"
if [[ -z "${morenames}" ]];then
echo "Processing ${domain}"
else
echo "Processing ${domain} with alternative names: ${morenames}"
fi
# read cert config
# for now this loads the certificate specific config in a subshell and parses a diff of set variables.
# we could just source the config file but i decided to go this way to protect people from accidentally overriding
# variables used internally by this script itself.
if [[ -n "${DOMAINS_D}" ]]; then
certconfig="${DOMAINS_D}/${domain}"
else
certconfig="${CERTDIR}/${domain}/config"
fi
if [ -f "${certconfig}" ]; then
echo " + Using certificate specific config file!"
ORIGIFS="${IFS}"
IFS=$'\n'
for cfgline in $(
beforevars="$(_mktemp)"
aftervars="$(_mktemp)"
set > "${beforevars}"
# shellcheck disable=SC1090
. "${certconfig}"
set > "${aftervars}"
diff -u "${beforevars}" "${aftervars}" | grep -E '^\+[^+]'
rm "${beforevars}"
rm "${aftervars}"
); do
config_var="$(echo "${cfgline:1}" | cut -d'=' -f1)"
config_value="$(echo "${cfgline:1}" | cut -d'=' -f2-)"
case "${config_var}" in
KEY_ALGO|OCSP_MUST_STAPLE|PRIVATE_KEY_RENEW|KEYSIZE|CHALLENGETYPE|HOOK|WELLKNOWN|HOOK_CHAIN|OPENSSL_CNF|RENEW_DAYS)
echo " + ${config_var} = ${config_value}"
declare -- "${config_var}=${config_value}"
;;
_) ;;
*) echo " ! Setting ${config_var} on a per-certificate base is not (yet) supported"
esac
done
IFS="${ORIGIFS}"
fi
verify_config
if [[ -e "${cert}" ]]; then
printf " + Checking domain name(s) of existing cert..."
certnames="$(openssl x509 -in "${cert}" -text -noout | grep DNS: | _sed 's/DNS://g' | tr -d ' ' | tr ',' '\n' | sort -u | tr '\n' ' ' | _sed 's/ $//')"
givennames="$(echo "${domain}" "${morenames}"| tr ' ' '\n' | sort -u | tr '\n' ' ' | _sed 's/ $//' | _sed 's/^ //')"
if [[ "${certnames}" = "${givennames}" ]]; then
echo " unchanged."
else
echo " changed!"
echo " + Domain name(s) are not matching!"
echo " + Names in old certificate: ${certnames}"
echo " + Configured names: ${givennames}"
echo " + Forcing renew."
force_renew="yes"
fi
fi
if [[ -e "${cert}" ]]; then
echo " + Checking expire date of existing cert..."
valid="$(openssl x509 -enddate -noout -in "${cert}" | cut -d= -f2- )"
printf " + Valid till %s " "${valid}"
if openssl x509 -checkend $((RENEW_DAYS * 86400)) -noout -in "${cert}"; then
printf "(Longer than %d days). " "${RENEW_DAYS}"
if [[ "${force_renew}" = "yes" ]]; then
echo "Ignoring because renew was forced!"
else
# Certificate-Names unchanged and cert is still valid
echo "Skipping renew!"
[[ -n "${HOOK}" ]] && "${HOOK}" "unchanged_cert" "${domain}" "${CERTDIR}/${domain}/privkey.pem" "${CERTDIR}/${domain}/cert.pem" "${CERTDIR}/${domain}/fullchain.pem" "${CERTDIR}/${domain}/chain.pem"
continue
fi
else
echo "(Less than ${RENEW_DAYS} days). Renewing!"
fi
fi
# shellcheck disable=SC2086
sign_domain ${line}
done
# remove temporary domains.txt file if used
[[ -n "${PARAM_DOMAIN:-}" ]] && rm -f "${DOMAINS_TXT}"
exit 0
}
# Usage: --signcsr (-s) path/to/csr.pem
# Description: Sign a given CSR, output CRT on stdout (advanced usage)
command_sign_csr() {
# redirect stdout to stderr
# leave stdout over at fd 3 to output the cert
exec 3>&1 1>&2
init_system
csrfile="${1}"
if [ ! -r "${csrfile}" ]; then
_exiterr "Could not read certificate signing request ${csrfile}"
fi
# gen cert
certfile="$(_mktemp)"
sign_csr "$(< "${csrfile}" )" 3> "${certfile}"
# get and convert ca cert
chainfile="$(_mktemp)"
http_request get "$(openssl x509 -in "${certfile}" -noout -text | grep 'CA Issuers - URI:' | cut -d':' -f2-)" > "${chainfile}"
if ! grep -q "BEGIN CERTIFICATE" "${chainfile}"; then
openssl x509 -inform DER -in "${chainfile}" -outform PEM -out "${chainfile}"
fi
# output full chain
echo "# CERT #" >&3
cat "${certfile}" >&3
echo >&3
echo "# CHAIN #" >&3
cat "${chainfile}" >&3
# cleanup
rm "${certfile}"
rm "${chainfile}"
exit 0
}
# Usage: --revoke (-r) path/to/cert.pem
# Description: Revoke specified certificate
command_revoke() {
init_system
[[ -n "${CA_REVOKE_CERT}" ]] || _exiterr "Certificate authority doesn't allow certificate revocation."
cert="${1}"
if [[ -L "${cert}" ]]; then
# follow symlink and use real certificate name (so we move the real file and not the symlink at the end)
local link_target
link_target="$(readlink -n "${cert}")"
if [[ "${link_target}" =~ ^/ ]]; then
cert="${link_target}"
else
cert="$(dirname "${cert}")/${link_target}"
fi
fi
[[ -f "${cert}" ]] || _exiterr "Could not find certificate ${cert}"
echo "Revoking ${cert}"
cert64="$(openssl x509 -in "${cert}" -inform PEM -outform DER | urlbase64)"
response="$(signed_request "${CA_REVOKE_CERT}" '{"resource": "revoke-cert", "certificate": "'"${cert64}"'"}' | clean_json)"
# if there is a problem with our revoke request _request (via signed_request) will report this and "exit 1" out
# so if we are here, it is safe to assume the request was successful
echo " + Done."
echo " + Renaming certificate to ${cert}-revoked"
mv -f "${cert}" "${cert}-revoked"
}
# Usage: --cleanup (-gc)
# Description: Move unused certificate files to archive directory
command_cleanup() {
load_config
# Create global archive directory if not existant
if [[ ! -e "${BASEDIR}/archive" ]]; then
mkdir "${BASEDIR}/archive"
fi
# Loop over all certificate directories
for certdir in "${CERTDIR}/"*; do
# Skip if entry is not a folder
[[ -d "${certdir}" ]] || continue
# Get certificate name
certname="$(basename "${certdir}")"
# Create certitifaces archive directory if not existant
archivedir="${BASEDIR}/archive/${certname}"
if [[ ! -e "${archivedir}" ]]; then
mkdir "${archivedir}"
fi
# Loop over file-types (certificates, keys, signing-requests, ...)
for filetype in cert.csr cert.pem chain.pem fullchain.pem privkey.pem; do
# Skip if symlink is broken
[[ -r "${certdir}/${filetype}" ]] || continue
# Look up current file in use
current="$(basename "$(readlink "${certdir}/${filetype}")")"
# Split filetype into name and extension
filebase="$(echo "${filetype}" | cut -d. -f1)"
fileext="$(echo "${filetype}" | cut -d. -f2)"
# Loop over all files of this type
for file in "${certdir}/${filebase}-"*".${fileext}"; do
# Handle case where no files match the wildcard
[[ -f "${file}" ]] || break
# Check if current file is in use, if unused move to archive directory
filename="$(basename "${file}")"
if [[ ! "${filename}" = "${current}" ]]; then
echo "Moving unused file to archive directory: ${certname}/${filename}"
mv "${certdir}/${filename}" "${archivedir}/${filename}"
fi
done
done
done
exit 0
}
# Usage: --help (-h)
# Description: Show help text
command_help() {
printf "Usage: %s [-h] [command [argument]] [parameter [argument]] [parameter [argument]] ...\n\n" "${0}"
printf "Default command: help\n\n"
echo "Commands:"
grep -e '^[[:space:]]*# Usage:' -e '^[[:space:]]*# Description:' -e '^command_.*()[[:space:]]*{' "${0}" | while read -r usage; read -r description; read -r command; do
if [[ ! "${usage}" =~ Usage ]] || [[ ! "${description}" =~ Description ]] || [[ ! "${command}" =~ ^command_ ]]; then
_exiterr "Error generating help text."
fi
printf " %-32s %s\n" "${usage##"# Usage: "}" "${description##"# Description: "}"
done
printf -- "\nParameters:\n"
grep -E -e '^[[:space:]]*# PARAM_Usage:' -e '^[[:space:]]*# PARAM_Description:' "${0}" | while read -r usage; read -r description; do
if [[ ! "${usage}" =~ Usage ]] || [[ ! "${description}" =~ Description ]]; then
_exiterr "Error generating help text."
fi
printf " %-32s %s\n" "${usage##"# PARAM_Usage: "}" "${description##"# PARAM_Description: "}"
done
}
# Usage: --env (-e)
# Description: Output configuration variables for use in other scripts
command_env() {
echo "# letsencrypt.sh configuration"
load_config
typeset -p CA LICENSE CERTDIR CHALLENGETYPE DOMAINS_D DOMAINS_TXT HOOK HOOK_CHAIN RENEW_DAYS ACCOUNT_KEY ACCOUNT_KEY_JSON KEYSIZE WELLKNOWN PRIVATE_KEY_RENEW OPENSSL_CNF CONTACT_EMAIL LOCKFILE
}
# Main method (parses script arguments and calls command_* methods)
main() {
COMMAND=""
set_command() {
[[ -z "${COMMAND}" ]] || _exiterr "Only one command can be executed at a time. See help (-h) for more information."
COMMAND="${1}"
}
check_parameters() {
if [[ -z "${1:-}" ]]; then
echo "The specified command requires additional parameters. See help:" >&2
echo >&2
command_help >&2
exit 1
elif [[ "${1:0:1}" = "-" ]]; then
_exiterr "Invalid argument: ${1}"
fi
}
[[ -z "${@}" ]] && eval set -- "--help"
while (( ${#} )); do
case "${1}" in
--help|-h)
command_help
exit 0
;;
--env|-e)
set_command env
;;
--cron|-c)
set_command sign_domains
;;
--signcsr|-s)
shift 1
set_command sign_csr
check_parameters "${1:-}"
PARAM_CSR="${1}"
;;
--revoke|-r)
shift 1
set_command revoke
check_parameters "${1:-}"
PARAM_REVOKECERT="${1}"
;;
--cleanup|-gc)
set_command cleanup
;;
# PARAM_Usage: --domain (-d) domain.tld
# PARAM_Description: Use specified domain name(s) instead of domains.txt entry (one certificate!)
--domain|-d)
shift 1
check_parameters "${1:-}"
if [[ -z "${PARAM_DOMAIN:-}" ]]; then
PARAM_DOMAIN="${1}"
else
PARAM_DOMAIN="${PARAM_DOMAIN} ${1}"
fi
;;
# PARAM_Usage: --force (-x)
# PARAM_Description: Force renew of certificate even if it is longer valid than value in RENEW_DAYS
--force|-x)
PARAM_FORCE="yes"
;;
# PARAM_Usage: --ocsp
# PARAM_Description: Sets option in CSR indicating OCSP stapling to be mandatory
--ocsp)
PARAM_OCSP_MUST_STAPLE="yes"
;;
# PARAM_Usage: --privkey (-p) path/to/key.pem
# PARAM_Description: Use specified private key instead of account key (useful for revocation)
--privkey|-p)
shift 1
check_parameters "${1:-}"
PARAM_ACCOUNT_KEY="${1}"
;;
# PARAM_Usage: --config (-f) path/to/config
# PARAM_Description: Use specified config file
--config|-f)
shift 1
check_parameters "${1:-}"
CONFIG="${1}"
;;