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Commit | Line | Data |
---|---|---|
61f0b7ed LS |
1 | #!/bin/bash |
2 | ||
69f3e78b LS |
3 | set -e |
4 | set -u | |
5 | set -o pipefail | |
61f0b7ed | 6 | |
5fedf3b3 | 7 | . ./config.sh |
61f0b7ed | 8 | |
181dd0ff SR |
9 | umask 077 # paranoid umask, we're creating private keys |
10 | ||
c6e60302 LS |
11 | anti_newline() { |
12 | tr -d '\n\r' | |
13 | } | |
181dd0ff | 14 | |
61f0b7ed | 15 | urlbase64() { |
c6e60302 LS |
16 | # urlbase64: base64 encoded string with '+' replaced with '-' and '/' replaced with '_' |
17 | openssl base64 -e | anti_newline | sed -r 's/=*$//g' | tr '+/' '-_' | |
61f0b7ed | 18 | } |
91ce50af | 19 | |
9fe313d8 | 20 | hex2bin() { |
c6e60302 | 21 | # Store hex string from stdin |
20e7d9d7 LS |
22 | tmphex="$(cat)" |
23 | ||
c6e60302 | 24 | # Remove spaces |
20e7d9d7 LS |
25 | hex='' |
26 | for ((i=0; i<${#tmphex}; i+=1)); do | |
27 | test "${tmphex:$i:1}" == " " || hex="${hex}${tmphex:$i:1}" | |
28 | done | |
29 | ||
c6e60302 | 30 | # Add leading zero |
20e7d9d7 LS |
31 | test $((${#hex} & 1)) == 0 || hex="0${hex}" |
32 | ||
c6e60302 | 33 | # Convert to escaped string |
20e7d9d7 LS |
34 | escapedhex='' |
35 | for ((i=0; i<${#hex}; i+=2)); do | |
36 | escapedhex=$escapedhex\\x${hex:$i:2} | |
37 | done | |
38 | ||
c6e60302 | 39 | # Convert to binary data |
20e7d9d7 | 40 | printf "${escapedhex}" |
9fe313d8 | 41 | } |
61f0b7ed | 42 | |
91ce50af LS |
43 | _request() { |
44 | temperr="$(mktemp)" | |
45 | if [ "${1}" = "head" ]; then | |
46 | curl -sSf -I "${2}" 2>${temperr} | |
47 | elif [ "${1}" = "get" ]; then | |
48 | curl -sSf "${2}" 2>${temperr} | |
49 | elif [ "${1}" = "post" ]; then | |
50 | curl -sSf "${2}" -d "${3}" 2>${temperr} | |
51 | fi | |
7ec1e45a | 52 | if [ ! -z "$(<${temperr})" ]; then echo " + ERROR: An error occured while sending ${1}-request to ${2} ($(<"${temperr}"))" >&2; exit 1; fi |
91ce50af LS |
53 | rm -f "${temperr}" |
54 | } | |
55 | ||
61f0b7ed | 56 | signed_request() { |
c6e60302 | 57 | # Encode payload as urlbase64 |
4aa48d33 | 58 | payload64="$(printf '%s' "${2}" | urlbase64)" |
61f0b7ed | 59 | |
c6e60302 LS |
60 | # Retrieve nonce from acme-server |
61 | nonce="$(_request head "${CA}/directory" | grep Replay-Nonce: | awk -F ': ' '{print $2}' | anti_newline)" | |
61f0b7ed | 62 | |
c6e60302 | 63 | # Build header with just our public key and algorithm information |
61f0b7ed LS |
64 | header='{"alg": "RS256", "jwk": {"e": "'"${pubExponent64}"'", "kty": "RSA", "n": "'"${pubMod64}"'"}}' |
65 | ||
c6e60302 | 66 | # Build another header which also contains the previously received nonce and encode it as urlbase64 |
61f0b7ed | 67 | protected='{"alg": "RS256", "jwk": {"e": "'"${pubExponent64}"'", "kty": "RSA", "n": "'"${pubMod64}"'"}, "nonce": "'"${nonce}"'"}' |
4aa48d33 | 68 | protected64="$(printf '%s' "${protected}" | urlbase64)" |
61f0b7ed | 69 | |
c6e60302 | 70 | # Sign header with nonce and our payload with our private key and encode signature as urlbase64 |
4aa48d33 | 71 | signed64="$(printf '%s' "${protected64}.${payload64}" | openssl dgst -sha256 -sign private_key.pem | urlbase64)" |
61f0b7ed | 72 | |
c6e60302 | 73 | # Send header + extended header + payload + signature to the acme-server |
61f0b7ed LS |
74 | data='{"header": '"${header}"', "protected": "'"${protected64}"'", "payload": "'"${payload64}"'", "signature": "'"${signed64}"'"}' |
75 | ||
91ce50af | 76 | _request post "${1}" "${data}" |
61f0b7ed LS |
77 | } |
78 | ||
61f0b7ed LS |
79 | sign_domain() { |
80 | domain="${1}" | |
1f65a335 SR |
81 | altnames="${*}" |
82 | echo "Signing domain ${1} (${*})..." | |
61f0b7ed | 83 | |
c6e60302 LS |
84 | # If there is no existing certificate directory we need a new private key |
85 | if [ ! -e "certs/${domain}" ]; then | |
61f0b7ed | 86 | mkdir "certs/${domain}" |
61f0b7ed | 87 | echo " + Generating private key..." |
f13eaa7f | 88 | openssl genrsa -out "certs/${domain}/privkey.pem" 4096 2> /dev/null > /dev/null |
61f0b7ed LS |
89 | fi |
90 | ||
c6e60302 LS |
91 | # Generate signing request config and the actual signing request |
92 | SAN="" | |
61f0b7ed | 93 | for altname in $altnames; do |
c6e60302 LS |
94 | SAN+="DNS:${altname}, " |
95 | done | |
96 | SAN="$(printf '%s' "${SAN}" | sed 's/,\s*$//g')" | |
97 | echo " + Generating signing request..." | |
98 | openssl req -new -sha256 -key "certs/${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 | |
99 | ||
100 | # Request and respond to challenges | |
101 | for altname in $altnames; do | |
102 | # Ask the acme-server for new challenge token and extract them from the resulting json block | |
61f0b7ed LS |
103 | echo " + Requesting challenge for ${altname}..." |
104 | response="$(signed_request "${CA}/acme/new-authz" '{"resource": "new-authz", "identifier": {"type": "dns", "value": "'"${altname}"'"}}')" | |
105 | ||
4aa48d33 SR |
106 | 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')" |
107 | challenge_uri="$(printf '%s\n' "${response}" | grep -Eo '"challenges":[^\[]*\[[^]]*]' | sed 's/{/\n{/g' | grep 'http-01' | grep -Eo '"uri":\s*"[^"]*"' | cut -d'"' -f4)" | |
61f0b7ed | 108 | |
2f3ee624 | 109 | if [ -z "${challenge_token}" ] || [ -z "${challenge_uri}" ]; then |
a1621214 | 110 | echo " + Error: Can't retrieve challenges (${response})" |
abb95693 LS |
111 | exit 1 |
112 | fi | |
113 | ||
c6e60302 | 114 | # Challenge response consists of the challenge token and the thumbprint of our public certificate |
61f0b7ed LS |
115 | keyauth="${challenge_token}.${thumbprint}" |
116 | ||
c6e60302 | 117 | # Store challenge response in well-known location and make world-readable (so that a webserver can access it) |
4aa48d33 | 118 | printf '%s' "${keyauth}" > "${WELLKNOWN}/${challenge_token}" |
2b5df371 | 119 | chmod a+r "${WELLKNOWN}/${challenge_token}" |
61f0b7ed | 120 | |
c6e60302 | 121 | # Ask the acme-server to verify our challenge and wait until it becomes valid |
61f0b7ed LS |
122 | echo " + Responding to challenge for ${altname}..." |
123 | result="$(signed_request "${challenge_uri}" '{"resource": "challenge", "keyAuthorization": "'"${keyauth}"'"}')" | |
124 | ||
4aa48d33 | 125 | status="$(printf '%s\n' "${result}" | grep -Eo '"status":\s*"[^"]*"' | cut -d'"' -f4)" |
61f0b7ed | 126 | if [ ! "${status}" = "pending" ] && [ ! "${status}" = "valid" ]; then |
f13eaa7f | 127 | echo " + Challenge is invalid! (${result})" |
61f0b7ed LS |
128 | exit 1 |
129 | fi | |
130 | ||
c6e60302 | 131 | while [ "${status}" = "pending" ]; do |
91ce50af | 132 | status="$(_request get "${challenge_uri}" | grep -Eo '"status":\s*"[^"]*"' | cut -d'"' -f4)" |
c6e60302 | 133 | sleep 1 |
61f0b7ed LS |
134 | done |
135 | ||
136 | echo " + Challenge is valid!" | |
137 | done | |
138 | ||
c6e60302 | 139 | # Finally request certificate from the acme-server and store it in cert.pem |
61f0b7ed LS |
140 | echo " + Requesting certificate..." |
141 | csr64="$(openssl req -in "certs/${domain}/cert.csr" -outform DER | urlbase64)" | |
c6e60302 | 142 | crt64="$(signed_request "${CA}/acme/new-cert" '{"resource": "new-cert", "csr": "'"${csr64}"'"}' | openssl base64 -e)" |
4aa48d33 | 143 | printf -- '-----BEGIN CERTIFICATE-----\n%s\n-----END CERTIFICATE-----\n' "${crt64}" > "certs/${domain}/cert.pem" |
61f0b7ed LS |
144 | echo " + Done!" |
145 | } | |
146 | ||
c6e60302 | 147 | # Check if private key exists, if it doesn't exist yet generate a new one (4096bit rsa key) |
8221727a | 148 | register="0" |
f13eaa7f LS |
149 | if [ ! -e "private_key.pem" ]; then |
150 | echo "+ Generating account key..." | |
151 | openssl genrsa -out "private_key.pem" 4096 2> /dev/null > /dev/null | |
8221727a LS |
152 | register="1" |
153 | fi | |
154 | ||
c6e60302 | 155 | # Get public components from private key and calculate thumbprint |
9fe313d8 | 156 | pubExponent64="$(printf "%06x" "$(openssl rsa -in private_key.pem -noout -text | grep publicExponent | head -1 | cut -d' ' -f2)" | hex2bin | urlbase64)" |
4aa48d33 | 157 | pubMod64="$(printf '%s' "$(openssl rsa -in private_key.pem -noout -modulus | cut -d'=' -f2)" | hex2bin | urlbase64)" |
8221727a | 158 | |
c6e60302 | 159 | thumbprint="$(printf '%s' "$(printf '%s' '{"e":"'"${pubExponent64}"'","kty":"RSA","n":"'"${pubMod64}"'"}' | shasum -a 256 | awk '{print $1}')" | hex2bin | urlbase64)" |
8221727a | 160 | |
c6e60302 | 161 | # If we generated a new private key in the step above we have to register it with the acme-server |
8221727a | 162 | if [ "${register}" = "1" ]; then |
f13eaa7f | 163 | echo "+ Registering account key with letsencrypt..." |
537f6fb7 | 164 | signed_request "${CA}/acme/new-reg" '{"resource": "new-reg", "agreement": "https://letsencrypt.org/documents/LE-SA-v1.0.1-July-27-2015.pdf"}' > /dev/null |
f13eaa7f LS |
165 | fi |
166 | ||
c6e60302 | 167 | # Generate certificates for all domains found in domain.txt (TODO: check if certificate already exists and is about to expire) |
a53cd916 | 168 | <domains.txt sed 's/^\s*//g;s/\s*$//g' | grep -v '^#' | grep -v '^$' | while read line; do |
6221526d | 169 | sign_domain $line |
61f0b7ed | 170 | done |