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Commit | Line | Data |
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2e8454b4 | 1 | #!/usr/bin/env bash |
61f0b7ed | 2 | |
69f3e78b LS |
3 | set -e |
4 | set -u | |
5 | set -o pipefail | |
61f0b7ed | 6 | |
f11bb1db SR |
7 | # default config values |
8 | CA="https://acme-v01.api.letsencrypt.org" | |
00a0937c | 9 | LICENSE="https://letsencrypt.org/documents/LE-SA-v1.0.1-July-27-2015.pdf" |
b33f1288 | 10 | HOOK_CHALLENGE= |
e300c0a1 | 11 | RENEW_DAYS="14" |
5a213f5f | 12 | KEYSIZE="4096" |
ff3dbc58 | 13 | WELLKNOWN=".acme-challenges" |
3dbbb461 | 14 | PRIVATE_KEY_RENEW=no |
f11bb1db | 15 | |
440dc30d LS |
16 | if [[ -e "config.sh" ]]; then |
17 | . ./config.sh | |
18 | fi | |
61f0b7ed | 19 | |
181dd0ff SR |
20 | umask 077 # paranoid umask, we're creating private keys |
21 | ||
c6e60302 LS |
22 | anti_newline() { |
23 | tr -d '\n\r' | |
24 | } | |
181dd0ff | 25 | |
61f0b7ed | 26 | urlbase64() { |
c6e60302 LS |
27 | # urlbase64: base64 encoded string with '+' replaced with '-' and '/' replaced with '_' |
28 | openssl base64 -e | anti_newline | sed -r 's/=*$//g' | tr '+/' '-_' | |
61f0b7ed | 29 | } |
91ce50af | 30 | |
9fe313d8 | 31 | hex2bin() { |
c6e60302 | 32 | # Store hex string from stdin |
20e7d9d7 LS |
33 | tmphex="$(cat)" |
34 | ||
c6e60302 | 35 | # Remove spaces |
20e7d9d7 LS |
36 | hex='' |
37 | for ((i=0; i<${#tmphex}; i+=1)); do | |
38 | test "${tmphex:$i:1}" == " " || hex="${hex}${tmphex:$i:1}" | |
39 | done | |
40 | ||
c6e60302 | 41 | # Add leading zero |
20e7d9d7 LS |
42 | test $((${#hex} & 1)) == 0 || hex="0${hex}" |
43 | ||
c6e60302 | 44 | # Convert to escaped string |
20e7d9d7 LS |
45 | escapedhex='' |
46 | for ((i=0; i<${#hex}; i+=2)); do | |
47 | escapedhex=$escapedhex\\x${hex:$i:2} | |
48 | done | |
49 | ||
c6e60302 | 50 | # Convert to binary data |
20e7d9d7 | 51 | printf "${escapedhex}" |
9fe313d8 | 52 | } |
61f0b7ed | 53 | |
91ce50af | 54 | _request() { |
3cb292cb LS |
55 | tempcont="$(mktemp)" |
56 | ||
dd5f36e5 | 57 | if [[ "${1}" = "head" ]]; then |
3cb292cb | 58 | statuscode="$(curl -s -w "%{http_code}" -o "${tempcont}" "${2}" -I)" |
dd5f36e5 | 59 | elif [[ "${1}" = "get" ]]; then |
3cb292cb | 60 | statuscode="$(curl -s -w "%{http_code}" -o "${tempcont}" "${2}")" |
dd5f36e5 | 61 | elif [[ "${1}" = "post" ]]; then |
3cb292cb | 62 | statuscode="$(curl -s -w "%{http_code}" -o "${tempcont}" "${2}" -d "${3}")" |
91ce50af | 63 | fi |
dd5f36e5 | 64 | |
3cb292cb LS |
65 | if [[ ! "${statuscode:0:1}" = "2" ]]; then |
66 | echo " + ERROR: An error occured while sending ${1}-request to ${2} (Status ${statuscode})" >&2 | |
67 | echo >&2 | |
68 | echo "Details:" >&2 | |
69 | echo "$(<"${tempcont}"))" >&2 | |
70 | rm -f "${tempcont}" | |
dd5f36e5 | 71 | exit 1 |
130ea6ab | 72 | fi |
dd5f36e5 | 73 | |
3cb292cb LS |
74 | cat "${tempcont}" |
75 | rm -f "${tempcont}" | |
91ce50af LS |
76 | } |
77 | ||
61f0b7ed | 78 | signed_request() { |
c6e60302 | 79 | # Encode payload as urlbase64 |
4aa48d33 | 80 | payload64="$(printf '%s' "${2}" | urlbase64)" |
61f0b7ed | 81 | |
c6e60302 LS |
82 | # Retrieve nonce from acme-server |
83 | nonce="$(_request head "${CA}/directory" | grep Replay-Nonce: | awk -F ': ' '{print $2}' | anti_newline)" | |
61f0b7ed | 84 | |
c6e60302 | 85 | # Build header with just our public key and algorithm information |
61f0b7ed LS |
86 | header='{"alg": "RS256", "jwk": {"e": "'"${pubExponent64}"'", "kty": "RSA", "n": "'"${pubMod64}"'"}}' |
87 | ||
c6e60302 | 88 | # Build another header which also contains the previously received nonce and encode it as urlbase64 |
61f0b7ed | 89 | protected='{"alg": "RS256", "jwk": {"e": "'"${pubExponent64}"'", "kty": "RSA", "n": "'"${pubMod64}"'"}, "nonce": "'"${nonce}"'"}' |
4aa48d33 | 90 | protected64="$(printf '%s' "${protected}" | urlbase64)" |
61f0b7ed | 91 | |
c6e60302 | 92 | # Sign header with nonce and our payload with our private key and encode signature as urlbase64 |
4aa48d33 | 93 | signed64="$(printf '%s' "${protected64}.${payload64}" | openssl dgst -sha256 -sign private_key.pem | urlbase64)" |
61f0b7ed | 94 | |
c6e60302 | 95 | # Send header + extended header + payload + signature to the acme-server |
61f0b7ed LS |
96 | data='{"header": '"${header}"', "protected": "'"${protected64}"'", "payload": "'"${payload64}"'", "signature": "'"${signed64}"'"}' |
97 | ||
91ce50af | 98 | _request post "${1}" "${data}" |
61f0b7ed LS |
99 | } |
100 | ||
61f0b7ed LS |
101 | sign_domain() { |
102 | domain="${1}" | |
1f65a335 | 103 | altnames="${*}" |
579e2316 | 104 | echo " + Signing domains..." |
61f0b7ed | 105 | |
3dbbb461 | 106 | # If there is no existing certificate directory => make it |
dd5f36e5 | 107 | if [[ ! -e "certs/${domain}" ]]; then |
579e2316 | 108 | echo " + make directory certs/${domain} ..." |
d211fece | 109 | mkdir -p "certs/${domain}" |
3dbbb461 MG |
110 | fi |
111 | ||
112 | # generate a new private key if we need or want one | |
113 | if [[ ! -f "certs/${domain}/privkey.pem" ]] || [[ "${PRIVATE_KEY_RENEW}" = "yes" ]]; then | |
579e2316 | 114 | echo " + Generating private key..." |
3dbbb461 MG |
115 | timestamp="$(date +%s)" |
116 | openssl genrsa -out "certs/${domain}/privkey-${timestamp}.pem" "${KEYSIZE}" 2> /dev/null > /dev/null | |
117 | rm -f "certs/${domain}/privkey.pem" | |
118 | ln -s "privkey-${timestamp}.pem" "certs/${domain}/privkey.pem" | |
61f0b7ed LS |
119 | fi |
120 | ||
c6e60302 LS |
121 | # Generate signing request config and the actual signing request |
122 | SAN="" | |
61f0b7ed | 123 | for altname in $altnames; do |
c6e60302 LS |
124 | SAN+="DNS:${altname}, " |
125 | done | |
126 | SAN="$(printf '%s' "${SAN}" | sed 's/,\s*$//g')" | |
579e2316 | 127 | echo " + Generating signing request..." |
c6e60302 LS |
128 | openssl req -new -sha256 -key "certs/${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 |
129 | ||
130 | # Request and respond to challenges | |
131 | for altname in $altnames; do | |
132 | # Ask the acme-server for new challenge token and extract them from the resulting json block | |
579e2316 | 133 | echo " + Requesting challenge for ${altname}..." |
61f0b7ed LS |
134 | response="$(signed_request "${CA}/acme/new-authz" '{"resource": "new-authz", "identifier": {"type": "dns", "value": "'"${altname}"'"}}')" |
135 | ||
4aa48d33 SR |
136 | 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')" |
137 | challenge_uri="$(printf '%s\n' "${response}" | grep -Eo '"challenges":[^\[]*\[[^]]*]' | sed 's/{/\n{/g' | grep 'http-01' | grep -Eo '"uri":\s*"[^"]*"' | cut -d'"' -f4)" | |
61f0b7ed | 138 | |
dd5f36e5 | 139 | if [[ -z "${challenge_token}" ]] || [[ -z "${challenge_uri}" ]]; then |
a1621214 | 140 | echo " + Error: Can't retrieve challenges (${response})" |
abb95693 LS |
141 | exit 1 |
142 | fi | |
143 | ||
c6e60302 | 144 | # Challenge response consists of the challenge token and the thumbprint of our public certificate |
61f0b7ed LS |
145 | keyauth="${challenge_token}.${thumbprint}" |
146 | ||
c6e60302 | 147 | # Store challenge response in well-known location and make world-readable (so that a webserver can access it) |
4aa48d33 | 148 | printf '%s' "${keyauth}" > "${WELLKNOWN}/${challenge_token}" |
2b5df371 | 149 | chmod a+r "${WELLKNOWN}/${challenge_token}" |
61f0b7ed | 150 | |
b33f1288 SR |
151 | # Wait for hook script to deploy the challenge if used |
152 | if [ -n "${HOOK_CHALLENGE}" ]; then | |
153 | ${HOOK_CHALLENGE} "${WELLKNOWN}/${challenge_token}" "${keyauth}" | |
154 | fi | |
155 | ||
c6e60302 | 156 | # Ask the acme-server to verify our challenge and wait until it becomes valid |
579e2316 | 157 | echo " + Responding to challenge for ${altname}..." |
61f0b7ed LS |
158 | result="$(signed_request "${challenge_uri}" '{"resource": "challenge", "keyAuthorization": "'"${keyauth}"'"}')" |
159 | ||
4aa48d33 | 160 | status="$(printf '%s\n' "${result}" | grep -Eo '"status":\s*"[^"]*"' | cut -d'"' -f4)" |
61f0b7ed | 161 | |
76a37834 | 162 | # get status until it a result is reached => not pending anymore |
dd5f36e5 | 163 | while [[ "${status}" = "pending" ]]; do |
c6e60302 | 164 | sleep 1 |
76a37834 | 165 | status="$(_request get "${challenge_uri}" | grep -Eo '"status":\s*"[^"]*"' | cut -d'"' -f4)" |
61f0b7ed LS |
166 | done |
167 | ||
76a37834 | 168 | if [[ "${status}" = "valid" ]]; then |
579e2316 | 169 | echo " + Challenge is valid!" |
76a37834 | 170 | else |
579e2316 | 171 | echo " + Challenge is invalid! (returned: ${status})" |
76a37834 MG |
172 | exit 1 |
173 | fi | |
174 | ||
61f0b7ed LS |
175 | done |
176 | ||
b7439a83 | 177 | # Finally request certificate from the acme-server and store it in cert-${timestamp}.pem and link from cert.pem |
579e2316 | 178 | echo " + Requesting certificate..." |
b7439a83 | 179 | timestamp="$(date +%s)" |
61f0b7ed | 180 | csr64="$(openssl req -in "certs/${domain}/cert.csr" -outform DER | urlbase64)" |
c6e60302 | 181 | crt64="$(signed_request "${CA}/acme/new-cert" '{"resource": "new-cert", "csr": "'"${csr64}"'"}' | openssl base64 -e)" |
b7439a83 MG |
182 | printf -- '-----BEGIN CERTIFICATE-----\n%s\n-----END CERTIFICATE-----\n' "${crt64}" > "certs/${domain}/cert-${timestamp}.pem" |
183 | rm -f "certs/${domain}/cert.pem" | |
184 | ln -s "cert-${timestamp}.pem" "certs/${domain}/cert.pem" | |
579e2316 | 185 | echo " + Done!" |
61f0b7ed LS |
186 | } |
187 | ||
5a213f5f | 188 | # Check if private key exists, if it doesn't exist yet generate a new one (rsa key) |
8221727a | 189 | register="0" |
dd5f36e5 | 190 | if [[ ! -e "private_key.pem" ]]; then |
f13eaa7f | 191 | echo "+ Generating account key..." |
5a213f5f | 192 | openssl genrsa -out "private_key.pem" "${KEYSIZE}" 2> /dev/null > /dev/null |
8221727a LS |
193 | register="1" |
194 | fi | |
195 | ||
c6e60302 | 196 | # Get public components from private key and calculate thumbprint |
9fe313d8 | 197 | pubExponent64="$(printf "%06x" "$(openssl rsa -in private_key.pem -noout -text | grep publicExponent | head -1 | cut -d' ' -f2)" | hex2bin | urlbase64)" |
4aa48d33 | 198 | pubMod64="$(printf '%s' "$(openssl rsa -in private_key.pem -noout -modulus | cut -d'=' -f2)" | hex2bin | urlbase64)" |
8221727a | 199 | |
c6e60302 | 200 | thumbprint="$(printf '%s' "$(printf '%s' '{"e":"'"${pubExponent64}"'","kty":"RSA","n":"'"${pubMod64}"'"}' | shasum -a 256 | awk '{print $1}')" | hex2bin | urlbase64)" |
8221727a | 201 | |
c6e60302 | 202 | # If we generated a new private key in the step above we have to register it with the acme-server |
dd5f36e5 | 203 | if [[ "${register}" = "1" ]]; then |
f13eaa7f | 204 | echo "+ Registering account key with letsencrypt..." |
00a0937c | 205 | signed_request "${CA}/acme/new-reg" '{"resource": "new-reg", "agreement": "'"$LICENSE"'"}' > /dev/null |
f13eaa7f LS |
206 | fi |
207 | ||
440dc30d LS |
208 | if [[ ! -e "domains.txt" ]]; then |
209 | echo "You have to create a domains.txt file listing the domains you want certificates for. Have a look at domains.txt.example." | |
210 | exit 1 | |
211 | fi | |
212 | ||
3390080c LS |
213 | if [[ ! -e "${WELLKNOWN}" ]]; then |
214 | mkdir -p "${WELLKNOWN}" | |
215 | fi | |
216 | ||
5060dea0 | 217 | # Generate certificates for all domains found in domain.txt. Check if existing certificate are about to expire |
c4be4c69 | 218 | <domains.txt sed 's/^\s*//g;s/\s*$//g' | grep -v '^#' | grep -v '^$' | while read -r line; do |
5060dea0 | 219 | domain="$(echo $line | cut -d' ' -f1)" |
579e2316 MG |
220 | cert="certs/${domain}/cert.pem" |
221 | ||
222 | echo "Processing ${domain}" | |
223 | if [[ -e "${cert}" ]]; then | |
224 | echo " + Found existing cert..." | |
225 | ||
226 | # Turning off exit on non-zero status for cert validation | |
227 | set +e; openssl x509 -checkend $((${RENEW_DAYS} * 86400)) -noout -in "${cert}"; expiring=$?; set -e | |
228 | valid="$(openssl x509 -enddate -noout -in "certs/${domain}/cert.pem" | cut -d= -f2- )" | |
229 | ||
230 | echo -n " + Valid till ${valid} " | |
5060dea0 | 231 | if [[ ${expiring} -eq 0 ]]; then |
579e2316 MG |
232 | echo "(Longer than ${RENEW_DAYS} days). Skipping!" |
233 | continue | |
5060dea0 | 234 | fi |
579e2316 | 235 | echo "(Less than ${RENEW_DAYS} days). Renewing!" |
5060dea0 MG |
236 | fi |
237 | ||
6221526d | 238 | sign_domain $line |
61f0b7ed | 239 | done |