LetsEncrypt with ACME on OpenWRT
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ACME
ACME is a Let'sEncrypt Client implementation for OpenWRT. It will request and store SSL / HTTPS Certificates for various purposes. It can be utilized by Apache, NGinx, UHTTPD, etc. on OpenWRT.
Installation
opkg update
opkg install acme acme-dnsapi luci-app-acme
Functionality
Based on the script files, it appears the "ACME Service" can be triggered by CRON or a Start or Restart of the service.
Usage Via Command Line
Quick Notes
--cert-file: Path and File Name where certificate will be copied to (IE, the 'originals' are stored elsewhere)
--key-file: Path and File Name where key will be copied to (IE, the 'originals' are stored elsewhere)
--fullchain-file: Path and File Name where full-chain will be copied to (IE, the 'originals' are stored elsewhere)
--ca-file: Path and File Name where ca will be copied to (IE, the 'originals' are stored elsewhere)
--home
--cert-home
--config-home
Source: https://github.com/acmesh-official/acme.sh
Also see contents of acme.sh --help below.
Files
/etc/config/acme: OpenWRT configuration file that receives / sends information from LuCI GUI
config acme
option state_dir '/etc/acme'
option account_email 'email@example.org'
option debug 0
config cert 'example'
option enabled 0
option use_staging 1
option keylength 2048
option update_uhttpd 1
option update_nginx 1
option webroot ""
option dns ""
list domains example.org/etc/acme: Storage location for certificates, referenced by /etc/config/acme /etc/init.d/acme: Service stop / start file
#!/bin/sh /etc/rc.common
USE_PROCD=1
START=50
SCRIPT=/usr/lib/acme/run-acme
start_service()
{
procd_open_instance
procd_set_param command $SCRIPT
procd_set_param file /etc/config/acme
procd_set_param stdout 1
procd_set_param stderr 1
procd_close_instance
}
reload_service() {
rc_procd start_service "$@"
return 0
}
stop_service() {
return 0
}
boot() {
touch "/var/run/acme_boot"
start
}
service_triggers()
{
procd_add_reload_trigger acme
}/usr/lib/acme/acme.sh: Appears to be a generic shell script. It can be used via the command line and is also used by the below /usr/lib/acme/run-acme "wrapper". Below is the help file;
https://github.com/Neilpang/acme.sh
v2.8.5
Usage: acme.sh command ...[parameters]....
Commands:
--help, -h Show this help message.
--version, -v Show version info.
--install Install acme.sh to your system.
--uninstall Uninstall acme.sh, and uninstall the cron job.
--upgrade Upgrade acme.sh to the latest code from https://github.com/Neilpang/acme.sh.
--issue Issue a cert.
--signcsr Issue a cert from an existing csr.
--deploy Deploy the cert to your server.
--install-cert Install the issued cert to apache/nginx or any other server.
--renew, -r Renew a cert.
--renew-all Renew all the certs.
--revoke Revoke a cert.
--remove Remove the cert from list of certs known to acme.sh.
--list List all the certs.
--showcsr Show the content of a csr.
--install-cronjob Install the cron job to renew certs, you don't need to call this. The 'install' command can automatically install the cron job.
--uninstall-cronjob Uninstall the cron job. The 'uninstall' command can do this automatically.
--cron Run cron job to renew all the certs.
--toPkcs Export the certificate and key to a pfx file.
--toPkcs8 Convert to pkcs8 format.
--update-account Update account info.
--register-account Register account key.
--deactivate-account Deactivate the account.
--create-account-key Create an account private key, professional use.
--create-domain-key Create an domain private key, professional use.
--createCSR, -ccsr Create CSR , professional use.
--deactivate Deactivate the domain authz, professional use.
--set-notify Set the cron notification hook, level or mode.
Parameters:
--domain, -d domain.tld Specifies a domain, used to issue, renew or revoke etc.
--challenge-alias domain.tld The challenge domain alias for DNS alias mode: https://github.com/Neilpang/acme.sh/wiki/DNS-alias-mode
--domain-alias domain.tld The domain alias for DNS alias mode: https://github.com/Neilpang/acme.sh/wiki/DNS-alias-mode
--force, -f Used to force to install or force to renew a cert immediately.
--staging, --test Use staging server, just for test.
--debug Output debug info.
--output-insecure Output all the sensitive messages. By default all the credentials/sensitive messages are hidden from the output/debug/log for secure.
--webroot, -w /path/to/webroot Specifies the web root folder for web root mode.
--standalone Use standalone mode.
--alpn Use standalone alpn mode.
--stateless Use stateless mode, see: https://github.com/Neilpang/acme.sh/wiki/Stateless-Mode
--apache Use apache mode.
--dns [dns_cf|dns_dp|dns_cx|/path/to/api/file] Use dns mode or dns api.
--dnssleep [120] The time in seconds to wait for all the txt records to take effect in dns api mode. Default 120 seconds.
--keylength, -k [2048] Specifies the domain key length: 2048, 3072, 4096, 8192 or ec-256, ec-384.
--accountkeylength, -ak [2048] Specifies the account key length.
--log [/path/to/logfile] Specifies the log file. The default is: "/root/.acme.sh/acme.sh.log" if you don't give a file path here.
--log-level 1|2 Specifies the log level, default is 1.
--syslog [0|3|6|7] Syslog level, 0: disable syslog, 3: error, 6: info, 7: debug.
These parameters are to install the cert to nginx/apache or any other server after issue/renew a cert:
--cert-file After issue/renew, the cert will be copied to this path.
--key-file After issue/renew, the key will be copied to this path.
--ca-file After issue/renew, the intermediate cert will be copied to this path.
--fullchain-file After issue/renew, the fullchain cert will be copied to this path.
--reloadcmd "service nginx reload" After issue/renew, it's used to reload the server.
--server SERVER ACME Directory Resource URI. (default: https://acme-v01.api.letsencrypt.org/directory)
--accountconf Specifies a customized account config file.
--home Specifies the home dir for acme.sh.
--cert-home Specifies the home dir to save all the certs, only valid for '--install' command.
--config-home Specifies the home dir to save all the configurations.
--useragent Specifies the user agent string. it will be saved for future use too.
--accountemail Specifies the account email, only valid for the '--install' and '--update-account' command.
--accountkey Specifies the account key path, only valid for the '--install' command.
--days Specifies the days to renew the cert when using '--issue' command. The default value is 60 days.
--httpport Specifies the standalone listening port. Only valid if the server is behind a reverse proxy or load balancer.
--tlsport Specifies the standalone tls listening port. Only valid if the server is behind a reverse proxy or load balancer.
--local-address Specifies the standalone/tls server listening address, in case you have multiple ip addresses.
--listraw Only used for '--list' command, list the certs in raw format.
--stopRenewOnError, -se Only valid for '--renew-all' command. Stop if one cert has error in renewal.
--insecure Do not check the server certificate, in some devices, the api server's certificate may not be trusted.
--ca-bundle Specifies the path to the CA certificate bundle to verify api server's certificate.
--ca-path Specifies directory containing CA certificates in PEM format, used by wget or curl.
--nocron Only valid for '--install' command, which means: do not install the default cron job. In this case, the certs will not be renewed automatically.
--noprofile Only valid for '--install' command, which means: do not install aliases to user profile.
--no-color Do not output color text.
--force-color Force output of color text. Useful for non-interactive use with the aha tool for HTML E-Mails.
--ecc Specifies to use the ECC cert. Valid for '--install-cert', '--renew', '--revoke', '--toPkcs' and '--createCSR'
--csr Specifies the input csr.
--pre-hook Command to be run before obtaining any certificates.
--post-hook Command to be run after attempting to obtain/renew certificates. No matter the obtain/renew is success or failed.
--renew-hook Command to be run once for each successfully renewed certificate.
--deploy-hook The hook file to deploy cert
--ocsp-must-staple, --ocsp Generate ocsp must Staple extension.
--always-force-new-domain-key Generate new domain key when renewal. Otherwise, the domain key is not changed by default.
--auto-upgrade [0|1] Valid for '--upgrade' command, indicating whether to upgrade automatically in future.
--listen-v4 Force standalone/tls server to listen at ipv4.
--listen-v6 Force standalone/tls server to listen at ipv6.
--openssl-bin Specifies a custom openssl bin location.
--use-wget Force to use wget, if you have both curl and wget installed.
--yes-I-know-dns-manual-mode-enough-go-ahead-please Force to use dns manual mode: https://github.com/Neilpang/acme.sh/wiki/dns-manual-mode
--branch, -b Only valid for '--upgrade' command, specifies the branch name to upgrade to.
--notify-level 0|1|2|3 Set the notification level: Default value is 2.
0: disabled, no notification will be sent.
1: send notifications only when there is an error.
2: send notifications when a cert is successfully renewed, or there is an error.
3: send notifications when a cert is skipped, renewed, or error.
--notify-mode 0|1 Set notification mode. Default value is 0.
0: Bulk mode. Send all the domain's notifications in one message(mail).
1: Cert mode. Send a message for every single cert.
--notify-hook [hookname] Set the notify hook/usr/lib/acme/run-acme: According to the notes in the file, it's a "wrapper" for the acme.sh script.