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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" |
f11bb1db | 13 | |
5fedf3b3 | 14 | . ./config.sh |
61f0b7ed | 15 | |
181dd0ff SR |
16 | umask 077 # paranoid umask, we're creating private keys |
17 | ||
c6e60302 LS |
18 | anti_newline() { |
19 | tr -d '\n\r' | |
20 | } | |
181dd0ff | 21 | |
61f0b7ed | 22 | urlbase64() { |
c6e60302 LS |
23 | # urlbase64: base64 encoded string with '+' replaced with '-' and '/' replaced with '_' |
24 | openssl base64 -e | anti_newline | sed -r 's/=*$//g' | tr '+/' '-_' | |
61f0b7ed | 25 | } |
91ce50af | 26 | |
9fe313d8 | 27 | hex2bin() { |
c6e60302 | 28 | # Store hex string from stdin |
20e7d9d7 LS |
29 | tmphex="$(cat)" |
30 | ||
c6e60302 | 31 | # Remove spaces |
20e7d9d7 LS |
32 | hex='' |
33 | for ((i=0; i<${#tmphex}; i+=1)); do | |
34 | test "${tmphex:$i:1}" == " " || hex="${hex}${tmphex:$i:1}" | |
35 | done | |
36 | ||
c6e60302 | 37 | # Add leading zero |
20e7d9d7 LS |
38 | test $((${#hex} & 1)) == 0 || hex="0${hex}" |
39 | ||
c6e60302 | 40 | # Convert to escaped string |
20e7d9d7 LS |
41 | escapedhex='' |
42 | for ((i=0; i<${#hex}; i+=2)); do | |
43 | escapedhex=$escapedhex\\x${hex:$i:2} | |
44 | done | |
45 | ||
c6e60302 | 46 | # Convert to binary data |
20e7d9d7 | 47 | printf "${escapedhex}" |
9fe313d8 | 48 | } |
61f0b7ed | 49 | |
91ce50af LS |
50 | _request() { |
51 | temperr="$(mktemp)" | |
dd5f36e5 | 52 | if [[ "${1}" = "head" ]]; then |
c4be4c69 | 53 | curl -sSf -I "${2}" 2> "${temperr}" |
dd5f36e5 | 54 | elif [[ "${1}" = "get" ]]; then |
c4be4c69 | 55 | curl -sSf "${2}" 2> "${temperr}" |
dd5f36e5 | 56 | elif [[ "${1}" = "post" ]]; then |
c4be4c69 | 57 | curl -sSf "${2}" -d "${3}" 2> "${temperr}" |
91ce50af | 58 | fi |
dd5f36e5 | 59 | |
96d7eabe | 60 | if [[ -s "${temperr}" ]]; then |
dd5f36e5 BDS |
61 | echo " + ERROR: An error occured while sending ${1}-request to ${2} ($(<"${temperr}"))" >&2 |
62 | rm -f "${temperr}" | |
63 | exit 1 | |
130ea6ab | 64 | fi |
dd5f36e5 | 65 | |
91ce50af LS |
66 | rm -f "${temperr}" |
67 | } | |
68 | ||
61f0b7ed | 69 | signed_request() { |
c6e60302 | 70 | # Encode payload as urlbase64 |
4aa48d33 | 71 | payload64="$(printf '%s' "${2}" | urlbase64)" |
61f0b7ed | 72 | |
c6e60302 LS |
73 | # Retrieve nonce from acme-server |
74 | nonce="$(_request head "${CA}/directory" | grep Replay-Nonce: | awk -F ': ' '{print $2}' | anti_newline)" | |
61f0b7ed | 75 | |
c6e60302 | 76 | # Build header with just our public key and algorithm information |
61f0b7ed LS |
77 | header='{"alg": "RS256", "jwk": {"e": "'"${pubExponent64}"'", "kty": "RSA", "n": "'"${pubMod64}"'"}}' |
78 | ||
c6e60302 | 79 | # Build another header which also contains the previously received nonce and encode it as urlbase64 |
61f0b7ed | 80 | protected='{"alg": "RS256", "jwk": {"e": "'"${pubExponent64}"'", "kty": "RSA", "n": "'"${pubMod64}"'"}, "nonce": "'"${nonce}"'"}' |
4aa48d33 | 81 | protected64="$(printf '%s' "${protected}" | urlbase64)" |
61f0b7ed | 82 | |
c6e60302 | 83 | # Sign header with nonce and our payload with our private key and encode signature as urlbase64 |
4aa48d33 | 84 | signed64="$(printf '%s' "${protected64}.${payload64}" | openssl dgst -sha256 -sign private_key.pem | urlbase64)" |
61f0b7ed | 85 | |
c6e60302 | 86 | # Send header + extended header + payload + signature to the acme-server |
61f0b7ed LS |
87 | data='{"header": '"${header}"', "protected": "'"${protected64}"'", "payload": "'"${payload64}"'", "signature": "'"${signed64}"'"}' |
88 | ||
91ce50af | 89 | _request post "${1}" "${data}" |
61f0b7ed LS |
90 | } |
91 | ||
61f0b7ed LS |
92 | sign_domain() { |
93 | domain="${1}" | |
1f65a335 SR |
94 | altnames="${*}" |
95 | echo "Signing domain ${1} (${*})..." | |
61f0b7ed | 96 | |
c6e60302 | 97 | # If there is no existing certificate directory we need a new private key |
dd5f36e5 | 98 | if [[ ! -e "certs/${domain}" ]]; then |
d211fece | 99 | mkdir -p "certs/${domain}" |
61f0b7ed | 100 | echo " + Generating private key..." |
5a213f5f | 101 | openssl genrsa -out "certs/${domain}/privkey.pem" "${KEYSIZE}" 2> /dev/null > /dev/null |
61f0b7ed LS |
102 | fi |
103 | ||
c6e60302 LS |
104 | # Generate signing request config and the actual signing request |
105 | SAN="" | |
61f0b7ed | 106 | for altname in $altnames; do |
c6e60302 LS |
107 | SAN+="DNS:${altname}, " |
108 | done | |
109 | SAN="$(printf '%s' "${SAN}" | sed 's/,\s*$//g')" | |
110 | echo " + Generating signing request..." | |
111 | openssl req -new -sha256 -key "certs/${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 | |
112 | ||
113 | # Request and respond to challenges | |
114 | for altname in $altnames; do | |
115 | # Ask the acme-server for new challenge token and extract them from the resulting json block | |
61f0b7ed LS |
116 | echo " + Requesting challenge for ${altname}..." |
117 | response="$(signed_request "${CA}/acme/new-authz" '{"resource": "new-authz", "identifier": {"type": "dns", "value": "'"${altname}"'"}}')" | |
118 | ||
4aa48d33 SR |
119 | 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')" |
120 | challenge_uri="$(printf '%s\n' "${response}" | grep -Eo '"challenges":[^\[]*\[[^]]*]' | sed 's/{/\n{/g' | grep 'http-01' | grep -Eo '"uri":\s*"[^"]*"' | cut -d'"' -f4)" | |
61f0b7ed | 121 | |
dd5f36e5 | 122 | if [[ -z "${challenge_token}" ]] || [[ -z "${challenge_uri}" ]]; then |
a1621214 | 123 | echo " + Error: Can't retrieve challenges (${response})" |
abb95693 LS |
124 | exit 1 |
125 | fi | |
126 | ||
c6e60302 | 127 | # Challenge response consists of the challenge token and the thumbprint of our public certificate |
61f0b7ed LS |
128 | keyauth="${challenge_token}.${thumbprint}" |
129 | ||
c6e60302 | 130 | # Store challenge response in well-known location and make world-readable (so that a webserver can access it) |
4aa48d33 | 131 | printf '%s' "${keyauth}" > "${WELLKNOWN}/${challenge_token}" |
2b5df371 | 132 | chmod a+r "${WELLKNOWN}/${challenge_token}" |
61f0b7ed | 133 | |
b33f1288 SR |
134 | # Wait for hook script to deploy the challenge if used |
135 | if [ -n "${HOOK_CHALLENGE}" ]; then | |
136 | ${HOOK_CHALLENGE} "${WELLKNOWN}/${challenge_token}" "${keyauth}" | |
137 | fi | |
138 | ||
c6e60302 | 139 | # Ask the acme-server to verify our challenge and wait until it becomes valid |
61f0b7ed LS |
140 | echo " + Responding to challenge for ${altname}..." |
141 | result="$(signed_request "${challenge_uri}" '{"resource": "challenge", "keyAuthorization": "'"${keyauth}"'"}')" | |
142 | ||
4aa48d33 | 143 | status="$(printf '%s\n' "${result}" | grep -Eo '"status":\s*"[^"]*"' | cut -d'"' -f4)" |
dd5f36e5 | 144 | if [[ ! "${status}" = "pending" ]] && [[ ! "${status}" = "valid" ]]; then |
f13eaa7f | 145 | echo " + Challenge is invalid! (${result})" |
61f0b7ed LS |
146 | exit 1 |
147 | fi | |
148 | ||
dd5f36e5 | 149 | while [[ "${status}" = "pending" ]]; do |
91ce50af | 150 | status="$(_request get "${challenge_uri}" | grep -Eo '"status":\s*"[^"]*"' | cut -d'"' -f4)" |
c6e60302 | 151 | sleep 1 |
61f0b7ed LS |
152 | done |
153 | ||
154 | echo " + Challenge is valid!" | |
155 | done | |
156 | ||
b7439a83 | 157 | # Finally request certificate from the acme-server and store it in cert-${timestamp}.pem and link from cert.pem |
61f0b7ed | 158 | echo " + Requesting certificate..." |
b7439a83 | 159 | timestamp="$(date +%s)" |
61f0b7ed | 160 | csr64="$(openssl req -in "certs/${domain}/cert.csr" -outform DER | urlbase64)" |
c6e60302 | 161 | crt64="$(signed_request "${CA}/acme/new-cert" '{"resource": "new-cert", "csr": "'"${csr64}"'"}' | openssl base64 -e)" |
b7439a83 MG |
162 | printf -- '-----BEGIN CERTIFICATE-----\n%s\n-----END CERTIFICATE-----\n' "${crt64}" > "certs/${domain}/cert-${timestamp}.pem" |
163 | rm -f "certs/${domain}/cert.pem" | |
164 | ln -s "cert-${timestamp}.pem" "certs/${domain}/cert.pem" | |
61f0b7ed LS |
165 | echo " + Done!" |
166 | } | |
167 | ||
5a213f5f | 168 | # Check if private key exists, if it doesn't exist yet generate a new one (rsa key) |
8221727a | 169 | register="0" |
dd5f36e5 | 170 | if [[ ! -e "private_key.pem" ]]; then |
f13eaa7f | 171 | echo "+ Generating account key..." |
5a213f5f | 172 | openssl genrsa -out "private_key.pem" "${KEYSIZE}" 2> /dev/null > /dev/null |
8221727a LS |
173 | register="1" |
174 | fi | |
175 | ||
c6e60302 | 176 | # Get public components from private key and calculate thumbprint |
9fe313d8 | 177 | pubExponent64="$(printf "%06x" "$(openssl rsa -in private_key.pem -noout -text | grep publicExponent | head -1 | cut -d' ' -f2)" | hex2bin | urlbase64)" |
4aa48d33 | 178 | pubMod64="$(printf '%s' "$(openssl rsa -in private_key.pem -noout -modulus | cut -d'=' -f2)" | hex2bin | urlbase64)" |
8221727a | 179 | |
c6e60302 | 180 | thumbprint="$(printf '%s' "$(printf '%s' '{"e":"'"${pubExponent64}"'","kty":"RSA","n":"'"${pubMod64}"'"}' | shasum -a 256 | awk '{print $1}')" | hex2bin | urlbase64)" |
8221727a | 181 | |
c6e60302 | 182 | # If we generated a new private key in the step above we have to register it with the acme-server |
dd5f36e5 | 183 | if [[ "${register}" = "1" ]]; then |
f13eaa7f | 184 | echo "+ Registering account key with letsencrypt..." |
00a0937c | 185 | signed_request "${CA}/acme/new-reg" '{"resource": "new-reg", "agreement": "'"$LICENSE"'"}' > /dev/null |
f13eaa7f LS |
186 | fi |
187 | ||
5060dea0 | 188 | # Generate certificates for all domains found in domain.txt. Check if existing certificate are about to expire |
c4be4c69 | 189 | <domains.txt sed 's/^\s*//g;s/\s*$//g' | grep -v '^#' | grep -v '^$' | while read -r line; do |
5060dea0 MG |
190 | domain="$(echo $line | cut -d' ' -f1)" |
191 | if [[ -e "certs/${domain}/cert.pem" ]]; then | |
192 | echo -n "Found existing cert for ${domain}. Expire date ..." | |
e300c0a1 | 193 | set +e; openssl x509 -checkend $((${RENEW_DAYS} * 86400)) -noout -in "certs/${domain}/cert.pem"; expiring=$?; set -e |
5060dea0 | 194 | if [[ ${expiring} -eq 0 ]]; then |
e300c0a1 | 195 | echo " is not within ${RENEW_DAYS} days. Skipping" |
5060dea0 MG |
196 | continue |
197 | fi | |
e300c0a1 | 198 | echo " is within ${RENEW_DAYS} days. Renewing..." |
5060dea0 MG |
199 | fi |
200 | ||
6221526d | 201 | sign_domain $line |
61f0b7ed | 202 | done |