-#!/bin/bash
+#!/usr/bin/env bash
set -e
+set -u
+set -o pipefail
+
+# default config values
+CA="https://acme-v01.api.letsencrypt.org"
+LICENSE="https://letsencrypt.org/documents/LE-SA-v1.0.1-July-27-2015.pdf"
+HOOK_CHALLENGE=
+RENEW_DAYS="14"
+KEYSIZE="4096"
+WELLKNOWN=".acme-challenges"
+PRIVATE_KEY_RENEW=no
+
+if [[ -e "config.sh" ]]; then
+ . ./config.sh
+fi
+
+umask 077 # paranoid umask, we're creating private keys
-source config.sh
+anti_newline() {
+ tr -d '\n\r'
+}
urlbase64() {
- base64 -w 0 | sed -r 's/=*$//g' | tr '+/' '-_'
+ # urlbase64: base64 encoded string with '+' replaced with '-' and '/' replaced with '_'
+ openssl base64 -e | anti_newline | sed -r 's/=*$//g' | tr '+/' '-_'
}
+
hex2bin() {
- perl -pe 's/([0-9a-f]{2})/chr hex $1/gie'
+ # Store hex string from stdin
+ tmphex="$(cat)"
+
+ # Remove spaces
+ hex=''
+ for ((i=0; i<${#tmphex}; i+=1)); do
+ test "${tmphex:$i:1}" == " " || hex="${hex}${tmphex:$i:1}"
+ done
+
+ # Add leading zero
+ test $((${#hex} & 1)) == 0 || hex="0${hex}"
+
+ # Convert to escaped string
+ escapedhex=''
+ for ((i=0; i<${#hex}; i+=2)); do
+ escapedhex=$escapedhex\\x${hex:$i:2}
+ done
+
+ # Convert to binary data
+ printf "${escapedhex}"
+}
+
+_request() {
+ tempcont="$(mktemp)"
+
+ if [[ "${1}" = "head" ]]; then
+ statuscode="$(curl -s -w "%{http_code}" -o "${tempcont}" "${2}" -I)"
+ elif [[ "${1}" = "get" ]]; then
+ statuscode="$(curl -s -w "%{http_code}" -o "${tempcont}" "${2}")"
+ elif [[ "${1}" = "post" ]]; then
+ statuscode="$(curl -s -w "%{http_code}" -o "${tempcont}" "${2}" -d "${3}")"
+ fi
+
+ if [[ ! "${statuscode:0:1}" = "2" ]]; then
+ echo " + ERROR: An error occured while sending ${1}-request to ${2} (Status ${statuscode})" >&2
+ echo >&2
+ echo "Details:" >&2
+ echo "$(<"${tempcont}"))" >&2
+ rm -f "${tempcont}"
+ exit 1
+ fi
+
+ cat "${tempcont}"
+ rm -f "${tempcont}"
}
signed_request() {
+ # Encode payload as urlbase64
payload64="$(printf '%s' "${2}" | urlbase64)"
- # -sSf: stay silent but report errors and exit with != 0 if they occur
- nonce="$(curl -sSf -I "${CA}"/directory | grep Replay-Nonce: | awk -F ': ' '{print $2}' | tr -d '\n\r')"
+ # Retrieve nonce from acme-server
+ nonce="$(_request head "${CA}/directory" | grep Replay-Nonce: | awk -F ': ' '{print $2}' | anti_newline)"
+ # Build header with just our public key and algorithm information
header='{"alg": "RS256", "jwk": {"e": "'"${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}.${payload64}" | openssl dgst -sha256 -sign private_key.pem | urlbase64)"
+ # Send header + extended header + payload + signature to the acme-server
data='{"header": '"${header}"', "protected": "'"${protected64}"'", "payload": "'"${payload64}"'", "signature": "'"${signed64}"'"}'
- curl -sSf -d "${data}" "${1}"
+ _request post "${1}" "${data}"
}
sign_domain() {
domain="${1}"
altnames="${*}"
echo "Signing domain ${1} (${*})..."
- if [ ! -e "certs/${domain}" ]; then
- SAN=""
- for altname in $altnames; do
- SAN+="DNS:${altname}, "
- done
- SAN="$(printf '%s' "${SAN}" | sed 's/,\s*$//g')"
- mkdir "certs/${domain}"
+ # If there is no existing certificate directory => make it
+ if [[ ! -e "certs/${domain}" ]]; then
+ echo " + make directory certs/${domain} ..."
+ mkdir -p "certs/${domain}"
+ fi
+ # generate a new private key if we need or want one
+ if [[ ! -f "certs/${domain}/privkey.pem" ]] || [[ "${PRIVATE_KEY_RENEW}" = "yes" ]]; then
echo " + Generating private key..."
- openssl genrsa -out "certs/${domain}/privkey.pem" 4096 2> /dev/null > /dev/null
- echo " + Generating signing request..."
- openssl req -new -sha256 -key "certs/${domain}/privkey.pem" -out "certs/${domain}/cert.csr" -subj "/CN=${domain}/" -reqexts SAN -config <(cat /etc/ssl/openssl.cnf <(printf "[SAN]\nsubjectAltName=%s" "${SAN}")) > /dev/null
+ timestamp="$(date +%s)"
+ openssl genrsa -out "certs/${domain}/privkey-${timestamp}.pem" "${KEYSIZE}" 2> /dev/null > /dev/null
+ rm -f "certs/${domain}/privkey.pem"
+ ln -s "privkey-${timestamp}.pem" "certs/${domain}/privkey.pem"
fi
+ # Generate signing request config and the actual signing request
+ SAN=""
for altname in $altnames; do
+ SAN+="DNS:${altname}, "
+ done
+ SAN="$(printf '%s' "${SAN}" | sed 's/,\s*$//g')"
+ echo " + Generating signing request..."
+ openssl req -new -sha256 -key "certs/${domain}/privkey.pem" -out "certs/${domain}/cert.csr" -subj "/CN=${domain}/" -reqexts SAN -config <(cat /etc/ssl/openssl.cnf <(printf "[SAN]\nsubjectAltName=%s" "${SAN}")) > /dev/null
+
+ # Request and respond to 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 "${CA}/acme/new-authz" '{"resource": "new-authz", "identifier": {"type": "dns", "value": "'"${altname}"'"}}')"
challenge_token="$(printf '%s\n' "${response}" | grep -Eo '"challenges":[^\[]*\[[^]]*]' | sed 's/{/\n{/g' | grep 'http-01' | grep -Eo '"token":\s*"[^"]*"' | cut -d'"' -f4 | sed 's/[^A-Za-z0-9_\-]/_/g')"
challenge_uri="$(printf '%s\n' "${response}" | grep -Eo '"challenges":[^\[]*\[[^]]*]' | sed 's/{/\n{/g' | grep 'http-01' | grep -Eo '"uri":\s*"[^"]*"' | cut -d'"' -f4)"
- if [ "${challenge_token}" = "" ] || [ "${challenge_uri}" = "" ]; then
+ if [[ -z "${challenge_token}" ]] || [[ -z "${challenge_uri}" ]]; then
echo " + Error: Can't retrieve challenges (${response})"
exit 1
fi
+ # Challenge response consists of the challenge token and the thumbprint of our public certificate
keyauth="${challenge_token}.${thumbprint}"
+ # Store challenge response in well-known location and make world-readable (so that a webserver can access it)
printf '%s' "${keyauth}" > "${WELLKNOWN}/${challenge_token}"
+ chmod a+r "${WELLKNOWN}/${challenge_token}"
+ # Wait for hook script to deploy the challenge if used
+ if [ -n "${HOOK_CHALLENGE}" ]; then
+ ${HOOK_CHALLENGE} "${WELLKNOWN}/${challenge_token}" "${keyauth}"
+ fi
+
+ # Ask the acme-server to verify our challenge and wait until it becomes valid
echo " + Responding to challenge for ${altname}..."
result="$(signed_request "${challenge_uri}" '{"resource": "challenge", "keyAuthorization": "'"${keyauth}"'"}')"
status="$(printf '%s\n' "${result}" | grep -Eo '"status":\s*"[^"]*"' | cut -d'"' -f4)"
- if [ ! "${status}" = "pending" ] && [ ! "${status}" = "valid" ]; then
- echo " + Challenge is invalid! (${result})"
+ # get status until it a result is reached => not pending anymore
+ while [[ "${status}" = "pending" ]]; do
+ sleep 1
+ status="$(_request get "${challenge_uri}" | grep -Eo '"status":\s*"[^"]*"' | cut -d'"' -f4)"
+ done
+
+ if [[ "${status}" = "valid" ]]; then
+ echo " + Challenge is valid!"
+ else
+ echo " + Challenge is invalid! (returned: ${status})"
exit 1
fi
- while [ ! "${status}" = "valid" ]; do
- status="$(curl -sSf "${challenge_uri}" | grep -Eo '"status":\s*"[^"]*"' | cut -d'"' -f4)"
- done
-
- echo " + Challenge is valid!"
done
+ # Finally request certificate from the acme-server and store it in cert-${timestamp}.pem and link from cert.pem
echo " + Requesting certificate..."
+ timestamp="$(date +%s)"
csr64="$(openssl req -in "certs/${domain}/cert.csr" -outform DER | urlbase64)"
- crt64="$(signed_request "${CA}/acme/new-cert" '{"resource": "new-cert", "csr": "'"${csr64}"'"}' | base64 -w 64)"
- printf -- '-----BEGIN CERTIFICATE-----\n%s\n-----END CERTIFICATE-----\n' "${crt64}" > "certs/${domain}/cert.pem"
+ crt64="$(signed_request "${CA}/acme/new-cert" '{"resource": "new-cert", "csr": "'"${csr64}"'"}' | openssl base64 -e)"
+ printf -- '-----BEGIN CERTIFICATE-----\n%s\n-----END CERTIFICATE-----\n' "${crt64}" > "certs/${domain}/cert-${timestamp}.pem"
+ rm -f "certs/${domain}/cert.pem"
+ ln -s "cert-${timestamp}.pem" "certs/${domain}/cert.pem"
echo " + Done!"
}
+# Check if private key exists, if it doesn't exist yet generate a new one (rsa key)
register="0"
-if [ ! -e "private_key.pem" ]; then
+if [[ ! -e "private_key.pem" ]]; then
echo "+ Generating account key..."
- openssl genrsa -out "private_key.pem" 4096 2> /dev/null > /dev/null
+ openssl genrsa -out "private_key.pem" "${KEYSIZE}" 2> /dev/null > /dev/null
register="1"
fi
+# Get public components from private key and calculate thumbprint
pubExponent64="$(printf "%06x" "$(openssl rsa -in private_key.pem -noout -text | grep publicExponent | head -1 | cut -d' ' -f2)" | hex2bin | urlbase64)"
pubMod64="$(printf '%s' "$(openssl rsa -in private_key.pem -noout -modulus | cut -d'=' -f2)" | hex2bin | urlbase64)"
-thumbprint="$(printf '%s' "$(printf '%s' '{"e":"'"${pubExponent64}"'","kty":"RSA","n":"'"${pubMod64}"'"}' | sha256sum | awk '{print $1}')" | hex2bin | urlbase64)"
+thumbprint="$(printf '%s' "$(printf '%s' '{"e":"'"${pubExponent64}"'","kty":"RSA","n":"'"${pubMod64}"'"}' | shasum -a 256 | awk '{print $1}')" | hex2bin | urlbase64)"
-if [ "${register}" = "1" ]; then
+# If we generated a new private key in the step above we have to register it with the acme-server
+if [[ "${register}" = "1" ]]; then
echo "+ Registering account key with letsencrypt..."
- signed_request "${CA}/acme/new-reg" '{"resource": "new-reg", "agreement": "https://letsencrypt.org/documents/LE-SA-v1.0.1-July-27-2015.pdf"}' > /dev/null
+ signed_request "${CA}/acme/new-reg" '{"resource": "new-reg", "agreement": "'"$LICENSE"'"}' > /dev/null
+fi
+
+if [[ ! -e "domains.txt" ]]; then
+ echo "You have to create a domains.txt file listing the domains you want certificates for. Have a look at domains.txt.example."
+ exit 1
+fi
+
+if [[ ! -e "${WELLKNOWN}" ]]; then
+ mkdir -p "${WELLKNOWN}"
fi
-<domains.txt sed 's/^\s*//g;s/\s*$//g' | grep -v '^#' | grep -v '^$' | while read line; do
- sign_domain "$line"
+# Generate certificates for all domains found in domain.txt. Check if existing certificate are about to expire
+<domains.txt sed 's/^\s*//g;s/\s*$//g' | grep -v '^#' | grep -v '^$' | while read -r line; do
+ domain="$(echo $line | cut -d' ' -f1)"
+ if [[ -e "certs/${domain}/cert.pem" ]]; then
+ echo -n "Found existing cert for ${domain}. Expire date ..."
+ set +e; openssl x509 -checkend $((${RENEW_DAYS} * 86400)) -noout -in "certs/${domain}/cert.pem"; expiring=$?; set -e
+ if [[ ${expiring} -eq 0 ]]; then
+ valid=$(openssl x509 -enddate -noout -in "certs/${domain}/cert.pem" | cut -d= -f2- )
+ echo " ${valid} Skipping. (Valid longer than ${RENEW_DAYS} days.)"
+ continue
+ fi
+ echo " is within ${RENEW_DAYS} days. Renewing..."
+ fi
+
+ sign_domain $line
done
projects / andy / dehydrated.git / blobdiff