# letsencrypt.sh

This is a client for signing certificates with an ACME-server (currently only provided by letsencrypt) implemented as a relatively simple bash-script.

It uses the `openssl` utility for everything related to actually handling keys and certificates, so you need to have that installed.

Other dependencies are (for now): curl, sed

Perl no longer is a dependency.
The only remaining perl code in this repository is the script you can use to convert your existing letsencrypt-keyfile into something openssl (and this script) can read.

Current features:
- Signing of a list of domains
- Renewal if a certificate is about to expire
- Certificate revocation

Please keep in mind that this software and even the acme-protocol are relatively young and may still have some unresolved issues.
Feel free to report any issues you find with this script or contribute by submitting a pullrequest.

## Usage:

Add domains to domains.txt like in this example:

```
example.com www.example.com
example.net www.example.net wiki.example.net
```

This states that there should be two certificates `example.com` and `example.net`,
with the other domains in the corresponding line being their alternative names.

You'll also need to set up a webserver to serve the challenge-response directory as configured with `$WELLKNOWN`,
or you can use the hook in the script if you want to deploy it some other way (e.g. copy it to a server via scp).

After doing those two things you can just `./letsencrypt.sh`, and it should generate certificates.

It can be used inside a cronjob as it automatically detects if a certificate is about to expire.

### Certificate revocation

Usage: `./letsencrypt.sh revoke path/to/cert.pem`

### nginx config

If you want to use nginx you can set up a location block to serve your challenge responses:

```
location /.well-known/acme-challenge {
  root /var/www/letsencrypt;
}
```

## Import

### import-account.pl

This perl-script can be used to import the account key from the original letsencrypt client.

You should copy `private_key.json` to the same directory as the script.
The json-file can be found in a subdirectory of `/etc/letsencrypt/accounts/acme-v01.api.letsencrypt.org/directory`.

Usage: `./import-account.pl`

### import-certs.sh

This script can be used to import private keys and certificates created by the original letsencrypt client.

By default it expects the certificates to be found under `/etc/letsencrypt`, which is the default output directory of the original client.
You can change the path by setting LETSENCRYPT in your config file: ```LETSENCRYPT="/etc/letsencrypt"```.

Usage: `./import-certs.sh`