1 # letsencrypt.sh [![Build Status](https://travis-ci.org/lukas2511/letsencrypt.sh.svg?branch=master)](https://travis-ci.org/lukas2511/letsencrypt.sh)
3 This is a client for signing certificates with an ACME-server (currently only provided by letsencrypt) implemented as a relatively simple bash-script.
5 It uses the `openssl` utility for everything related to actually handling keys and certificates, so you need to have that installed.
7 Other dependencies are: curl, sed, grep, mktemp (all found on almost any system, curl being the only exception)
10 - Signing of a list of domains
12 - Renewal if a certificate is about to expire or SAN (subdomains) changed
13 - Certificate revocation
15 If you want to import existing keys from the official letsencrypt client have a look at [Import from official letsencrypt client](https://github.com/lukas2511/letsencrypt.sh/wiki/Import-from-official-letsencrypt-client).
17 **Please note that you should use the staging URL when testing so as not to hit rate limits.** See the [Staging](#staging) section, below.
19 Please keep in mind that this software and even the acme-protocol are relatively young and may still have some unresolved issues.
20 Feel free to report any issues you find with this script or contribute by submitting a pullrequest.
25 Usage: ./letsencrypt.sh [-h] [command [argument]] [parameter [argument]] [parameter [argument]] ...
30 --cron (-c) Sign/renew non-existant/changed/expiring certificates.
31 --signcsr (-s) path/to/csr.pem Sign a given CSR, output CRT on stdout (advanced usage)
32 --revoke (-r) path/to/cert.pem Revoke specified certificate
33 --help (-h) Show help text
34 --env (-e) Output configuration variables for use in other scripts
37 --domain (-d) domain.tld Use specified domain name(s) instead of domains.txt entry (one certificate!)
38 --force (-x) Force renew of certificate even if it is longer valid than value in RENEW_DAYS
39 --privkey (-p) path/to/key.pem Use specified private key instead of account key (useful for revocation)
40 --config (-f) path/to/config.sh Use specified config file
41 --hook (-k) path/to/hook.sh Use specified script for hooks
42 --challenge (-t) http-01|dns-01 Which challenge should be used? Currently http-01 and dns-01 are supported
47 The file `domains.txt` should have the following format:
50 example.com www.example.com
51 example.net www.example.net wiki.example.net
54 This states that there should be two certificates `example.com` and `example.net`,
55 with the other domains in the corresponding line being their alternative names.
57 ### $WELLKNOWN / challenge-response
59 Boulder (acme-server) is looking for challenge responses under your domain in the `.well-known/acme-challenge` directory
61 This script uses `http-01`-type verification (for now) so you need to have that directory available over normal http (no ssl).
63 A full URL would look like `http://example.org/.well-known/acme-challenge/c3VjaC1jaGFsbGVuZ2UtbXVjaA-aW52YWxpZC13b3c`.
65 An example setup to get this to work would be:
70 location /.well-known/acme-challenge {
71 alias /var/www/letsencrypt;
79 WELLKNOWN="/var/www/letsencrypt"
83 An alternative to setting the WELLKNOWN variable would be to create a symlink to the default location next to the script (or BASEDIR):
84 `ln -s /var/www/letsencrypt .acme-challenges`
88 Let’s Encrypt has stringent rate limits in place during the public beta period. If you start testing using the production endpoint (which is the default), you will quickly hit these limits and find yourself locked out. To avoid this, please set the CA property to the Let’s Encrypt staging server URL in your `config.sh` file:
91 CA="https://acme-staging.api.letsencrypt.org/directory"
96 This script also supports the new `dns-01`-type verification. This type of verification requires you to be able to create a specific `TXT` DNS record for each hostname included in the certificate.
98 You need a hook script that deploys the challenge to your DNS server!
100 The hook script (indicated in the config.sh file or the --hook/-k command line argument) gets four arguments: an operation name (clean_challenge, deploy_challenge, or deploy_cert) and some operands for that. For deploy_challenge $2 is the domain name for which the certificate is required, $3 is a "challenge token" (which is not needed for dns-01), and $4 is a token which needs to be inserted in a TXT record for the domain.
102 Typically, you will need to split the subdomain name in two, the subdomain name and the domain name separately. For example, for "my.example.com", you'll need "my" and "example.com" separately. You then have to prefix "_acme-challenge." before the subdomain name, as in "_acme-challenge.my" and set a TXT record for that on the domain (e.g. "example.com") which has the value supplied in $4
104 That could be done manually (as most providers don't have a DNS API), by having your hook script echo $1, $2 and $4 and then wait (read -s -r -e < /dev/tty) - give it a little time to get into their DNS system. Usually providers give you a boxes to put "_acme-challenge.my" and the token value in, and a dropdown to choose the record type, TXT.
106 Or when you do have a DNS API, pass the details accordingly to achieve the same thing.
108 You can delete the TXT record when called with operation clean_challenge, when $2 is also the domain name.
110 Here are some examples: [Examples for DNS-01 hooks](https://github.com/lukas2511/letsencrypt.sh/wiki/Examples-for-DNS-01-hooks)
112 ### Elliptic Curve Cryptography (ECC)
114 This script also supports certificates with Elliptic Curve public keys! Be aware that at the moment this is not available on the production servers from letsencrypt. Please read https://community.letsencrypt.org/t/ecdsa-testing-on-staging/8809/ for the current state of ECC support.