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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= |
5a213f5f | 11 | KEYSIZE="4096" |
f11bb1db | 12 | |
5fedf3b3 | 13 | . ./config.sh |
61f0b7ed | 14 | |
181dd0ff SR |
15 | umask 077 # paranoid umask, we're creating private keys |
16 | ||
c6e60302 LS |
17 | anti_newline() { |
18 | tr -d '\n\r' | |
19 | } | |
181dd0ff | 20 | |
61f0b7ed | 21 | urlbase64() { |
c6e60302 LS |
22 | # urlbase64: base64 encoded string with '+' replaced with '-' and '/' replaced with '_' |
23 | openssl base64 -e | anti_newline | sed -r 's/=*$//g' | tr '+/' '-_' | |
61f0b7ed | 24 | } |
91ce50af | 25 | |
9fe313d8 | 26 | hex2bin() { |
c6e60302 | 27 | # Store hex string from stdin |
20e7d9d7 LS |
28 | tmphex="$(cat)" |
29 | ||
c6e60302 | 30 | # Remove spaces |
20e7d9d7 LS |
31 | hex='' |
32 | for ((i=0; i<${#tmphex}; i+=1)); do | |
33 | test "${tmphex:$i:1}" == " " || hex="${hex}${tmphex:$i:1}" | |
34 | done | |
35 | ||
c6e60302 | 36 | # Add leading zero |
20e7d9d7 LS |
37 | test $((${#hex} & 1)) == 0 || hex="0${hex}" |
38 | ||
c6e60302 | 39 | # Convert to escaped string |
20e7d9d7 LS |
40 | escapedhex='' |
41 | for ((i=0; i<${#hex}; i+=2)); do | |
42 | escapedhex=$escapedhex\\x${hex:$i:2} | |
43 | done | |
44 | ||
c6e60302 | 45 | # Convert to binary data |
20e7d9d7 | 46 | printf "${escapedhex}" |
9fe313d8 | 47 | } |
61f0b7ed | 48 | |
91ce50af LS |
49 | _request() { |
50 | temperr="$(mktemp)" | |
dd5f36e5 | 51 | if [[ "${1}" = "head" ]]; then |
c4be4c69 | 52 | curl -sSf -I "${2}" 2> "${temperr}" |
dd5f36e5 | 53 | elif [[ "${1}" = "get" ]]; then |
c4be4c69 | 54 | curl -sSf "${2}" 2> "${temperr}" |
dd5f36e5 | 55 | elif [[ "${1}" = "post" ]]; then |
c4be4c69 | 56 | curl -sSf "${2}" -d "${3}" 2> "${temperr}" |
91ce50af | 57 | fi |
dd5f36e5 | 58 | |
96d7eabe | 59 | if [[ -s "${temperr}" ]]; then |
dd5f36e5 BDS |
60 | echo " + ERROR: An error occured while sending ${1}-request to ${2} ($(<"${temperr}"))" >&2 |
61 | rm -f "${temperr}" | |
62 | exit 1 | |
130ea6ab | 63 | fi |
dd5f36e5 | 64 | |
91ce50af LS |
65 | rm -f "${temperr}" |
66 | } | |
67 | ||
61f0b7ed | 68 | signed_request() { |
c6e60302 | 69 | # Encode payload as urlbase64 |
4aa48d33 | 70 | payload64="$(printf '%s' "${2}" | urlbase64)" |
61f0b7ed | 71 | |
c6e60302 LS |
72 | # Retrieve nonce from acme-server |
73 | nonce="$(_request head "${CA}/directory" | grep Replay-Nonce: | awk -F ': ' '{print $2}' | anti_newline)" | |
61f0b7ed | 74 | |
c6e60302 | 75 | # Build header with just our public key and algorithm information |
61f0b7ed LS |
76 | header='{"alg": "RS256", "jwk": {"e": "'"${pubExponent64}"'", "kty": "RSA", "n": "'"${pubMod64}"'"}}' |
77 | ||
c6e60302 | 78 | # Build another header which also contains the previously received nonce and encode it as urlbase64 |
61f0b7ed | 79 | protected='{"alg": "RS256", "jwk": {"e": "'"${pubExponent64}"'", "kty": "RSA", "n": "'"${pubMod64}"'"}, "nonce": "'"${nonce}"'"}' |
4aa48d33 | 80 | protected64="$(printf '%s' "${protected}" | urlbase64)" |
61f0b7ed | 81 | |
c6e60302 | 82 | # Sign header with nonce and our payload with our private key and encode signature as urlbase64 |
4aa48d33 | 83 | signed64="$(printf '%s' "${protected64}.${payload64}" | openssl dgst -sha256 -sign private_key.pem | urlbase64)" |
61f0b7ed | 84 | |
c6e60302 | 85 | # Send header + extended header + payload + signature to the acme-server |
61f0b7ed LS |
86 | data='{"header": '"${header}"', "protected": "'"${protected64}"'", "payload": "'"${payload64}"'", "signature": "'"${signed64}"'"}' |
87 | ||
91ce50af | 88 | _request post "${1}" "${data}" |
61f0b7ed LS |
89 | } |
90 | ||
61f0b7ed LS |
91 | sign_domain() { |
92 | domain="${1}" | |
1f65a335 SR |
93 | altnames="${*}" |
94 | echo "Signing domain ${1} (${*})..." | |
61f0b7ed | 95 | |
c6e60302 | 96 | # If there is no existing certificate directory we need a new private key |
dd5f36e5 | 97 | if [[ ! -e "certs/${domain}" ]]; then |
d211fece | 98 | mkdir -p "certs/${domain}" |
61f0b7ed | 99 | echo " + Generating private key..." |
5a213f5f | 100 | openssl genrsa -out "certs/${domain}/privkey.pem" "${KEYSIZE}" 2> /dev/null > /dev/null |
61f0b7ed LS |
101 | fi |
102 | ||
c6e60302 LS |
103 | # Generate signing request config and the actual signing request |
104 | SAN="" | |
61f0b7ed | 105 | for altname in $altnames; do |
c6e60302 LS |
106 | SAN+="DNS:${altname}, " |
107 | done | |
108 | SAN="$(printf '%s' "${SAN}" | sed 's/,\s*$//g')" | |
109 | echo " + Generating signing request..." | |
110 | openssl req -new -sha256 -key "certs/${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 | |
111 | ||
112 | # Request and respond to challenges | |
113 | for altname in $altnames; do | |
114 | # Ask the acme-server for new challenge token and extract them from the resulting json block | |
61f0b7ed LS |
115 | echo " + Requesting challenge for ${altname}..." |
116 | response="$(signed_request "${CA}/acme/new-authz" '{"resource": "new-authz", "identifier": {"type": "dns", "value": "'"${altname}"'"}}')" | |
117 | ||
4aa48d33 SR |
118 | 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')" |
119 | challenge_uri="$(printf '%s\n' "${response}" | grep -Eo '"challenges":[^\[]*\[[^]]*]' | sed 's/{/\n{/g' | grep 'http-01' | grep -Eo '"uri":\s*"[^"]*"' | cut -d'"' -f4)" | |
61f0b7ed | 120 | |
dd5f36e5 | 121 | if [[ -z "${challenge_token}" ]] || [[ -z "${challenge_uri}" ]]; then |
a1621214 | 122 | echo " + Error: Can't retrieve challenges (${response})" |
abb95693 LS |
123 | exit 1 |
124 | fi | |
125 | ||
c6e60302 | 126 | # Challenge response consists of the challenge token and the thumbprint of our public certificate |
61f0b7ed LS |
127 | keyauth="${challenge_token}.${thumbprint}" |
128 | ||
c6e60302 | 129 | # Store challenge response in well-known location and make world-readable (so that a webserver can access it) |
4aa48d33 | 130 | printf '%s' "${keyauth}" > "${WELLKNOWN}/${challenge_token}" |
2b5df371 | 131 | chmod a+r "${WELLKNOWN}/${challenge_token}" |
61f0b7ed | 132 | |
b33f1288 SR |
133 | # Wait for hook script to deploy the challenge if used |
134 | if [ -n "${HOOK_CHALLENGE}" ]; then | |
135 | ${HOOK_CHALLENGE} "${WELLKNOWN}/${challenge_token}" "${keyauth}" | |
136 | fi | |
137 | ||
c6e60302 | 138 | # Ask the acme-server to verify our challenge and wait until it becomes valid |
61f0b7ed LS |
139 | echo " + Responding to challenge for ${altname}..." |
140 | result="$(signed_request "${challenge_uri}" '{"resource": "challenge", "keyAuthorization": "'"${keyauth}"'"}')" | |
141 | ||
4aa48d33 | 142 | status="$(printf '%s\n' "${result}" | grep -Eo '"status":\s*"[^"]*"' | cut -d'"' -f4)" |
dd5f36e5 | 143 | if [[ ! "${status}" = "pending" ]] && [[ ! "${status}" = "valid" ]]; then |
f13eaa7f | 144 | echo " + Challenge is invalid! (${result})" |
61f0b7ed LS |
145 | exit 1 |
146 | fi | |
147 | ||
dd5f36e5 | 148 | while [[ "${status}" = "pending" ]]; do |
91ce50af | 149 | status="$(_request get "${challenge_uri}" | grep -Eo '"status":\s*"[^"]*"' | cut -d'"' -f4)" |
c6e60302 | 150 | sleep 1 |
61f0b7ed LS |
151 | done |
152 | ||
153 | echo " + Challenge is valid!" | |
154 | done | |
155 | ||
c6e60302 | 156 | # Finally request certificate from the acme-server and store it in cert.pem |
61f0b7ed LS |
157 | echo " + Requesting certificate..." |
158 | csr64="$(openssl req -in "certs/${domain}/cert.csr" -outform DER | urlbase64)" | |
c6e60302 | 159 | crt64="$(signed_request "${CA}/acme/new-cert" '{"resource": "new-cert", "csr": "'"${csr64}"'"}' | openssl base64 -e)" |
4aa48d33 | 160 | printf -- '-----BEGIN CERTIFICATE-----\n%s\n-----END CERTIFICATE-----\n' "${crt64}" > "certs/${domain}/cert.pem" |
61f0b7ed LS |
161 | echo " + Done!" |
162 | } | |
163 | ||
5a213f5f | 164 | # Check if private key exists, if it doesn't exist yet generate a new one (rsa key) |
8221727a | 165 | register="0" |
dd5f36e5 | 166 | if [[ ! -e "private_key.pem" ]]; then |
f13eaa7f | 167 | echo "+ Generating account key..." |
5a213f5f | 168 | openssl genrsa -out "private_key.pem" "${KEYSIZE}" 2> /dev/null > /dev/null |
8221727a LS |
169 | register="1" |
170 | fi | |
171 | ||
c6e60302 | 172 | # Get public components from private key and calculate thumbprint |
9fe313d8 | 173 | pubExponent64="$(printf "%06x" "$(openssl rsa -in private_key.pem -noout -text | grep publicExponent | head -1 | cut -d' ' -f2)" | hex2bin | urlbase64)" |
4aa48d33 | 174 | pubMod64="$(printf '%s' "$(openssl rsa -in private_key.pem -noout -modulus | cut -d'=' -f2)" | hex2bin | urlbase64)" |
8221727a | 175 | |
c6e60302 | 176 | thumbprint="$(printf '%s' "$(printf '%s' '{"e":"'"${pubExponent64}"'","kty":"RSA","n":"'"${pubMod64}"'"}' | shasum -a 256 | awk '{print $1}')" | hex2bin | urlbase64)" |
8221727a | 177 | |
c6e60302 | 178 | # If we generated a new private key in the step above we have to register it with the acme-server |
dd5f36e5 | 179 | if [[ "${register}" = "1" ]]; then |
f13eaa7f | 180 | echo "+ Registering account key with letsencrypt..." |
00a0937c | 181 | signed_request "${CA}/acme/new-reg" '{"resource": "new-reg", "agreement": "'"$LICENSE"'"}' > /dev/null |
f13eaa7f LS |
182 | fi |
183 | ||
c6e60302 | 184 | # Generate certificates for all domains found in domain.txt (TODO: check if certificate already exists and is about to expire) |
c4be4c69 | 185 | <domains.txt sed 's/^\s*//g;s/\s*$//g' | grep -v '^#' | grep -v '^$' | while read -r line; do |
6221526d | 186 | sign_domain $line |
61f0b7ed | 187 | done |