| title | date | draft | categories | tags | thumbnail | ||||
|---|---|---|---|---|---|---|---|---|---|
Using Let's Encrypt Certificates with Unifi |
2018-04-25 |
false |
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/images/2018/04/lets-encrypt-logo.png |
Let's Encrypt is a great service that automates deployment and renewal of SSL certificates, at a bargain price. For most situations where you have a regular OS, the default Certbot Acme client works well. However for more embedded solutions, like Ubiquiti's Unifi Cloudkey this is not an option as there is no full Linux OS. After researching a few of the alternative options, Acme Shell was the clear winner. It runs using the Bourne shell, and has Unifi support built in.
One of the concerns that I had was any software placed on the cloudkey would get wiped when upgrading the firmware. I have confirmed that files in the home directory of admin (which is really root) do not get wiped. At most, the cronjob will need to be replaced. the Acme Shell has a command to reinstall the cronjob if required.
Acme Shell supports a stack of major DNS providers. I use AWS Infrastructure which just works, YMMV
Installing is a simple as opening an SSH session to your cloudkey and executing curl https://get.acme.sh | sh
Once installed, change to the .acme.sh directory. I need to set up my AWS keys, then execute the installation command. You will need to specify the hostname that you want the cloudkey to have, for me thats unifi-cloudkey.ingram.net.au
cd .acme.sh
export AWS_ACCESS_KEY_ID=XXXXXXXXXX
export AWS_SECRET_ACCESS_KEY=YYYYYYYYYYYYYYYYY
./acme.sh --issue --dns dns_aws -d unifi-cloudkey.ingram.net.au
The following output is displayed on your console:
[Tue Apr 24 22:50:33 +11 2018] Registering account
[Tue Apr 24 22:50:36 +11 2018] Registered
[Tue Apr 24 22:50:37 +11 2018] ACCOUNT_THUMBPRINT='-x9xTedsnDy0coEUo1XCXm0LWlzNYmBfdQzFNB4ETWU'
[Tue Apr 24 22:50:37 +11 2018] Creating domain key
[Tue Apr 24 22:50:52 +11 2018] The domain key is here: /root/.acme.sh/unifi-cloudkey.ingram.net.au/unifi-cloudkey.ingram.net.au.key
[Tue Apr 24 22:50:52 +11 2018] Single domain='unifi-cloudkey.ingram.net.au'
[Tue Apr 24 22:50:52 +11 2018] Getting domain auth token for each domain
[Tue Apr 24 22:50:52 +11 2018] Getting webroot for domain='unifi-cloudkey.ingram.net.au'
[Tue Apr 24 22:50:52 +11 2018] Getting new-authz for domain='unifi-cloudkey.ingram.net.au'
[Tue Apr 24 22:50:55 +11 2018] The new-authz request is ok.
[Tue Apr 24 22:50:55 +11 2018] Found domain api file: /root/.acme.sh/dnsapi/dns_aws.sh
[Tue Apr 24 22:51:04 +11 2018] Geting existing records for _acme-challenge.unifi-cloudkey.ingram.net.au
[Tue Apr 24 22:51:09 +11 2018] txt record updated success.
[Tue Apr 24 22:51:09 +11 2018] Sleep 120 seconds for the txt records to take effect
[Tue Apr 24 22:53:12 +11 2018] Verifying:unifi-cloudkey.ingram.net.au
[Tue Apr 24 22:53:17 +11 2018] Success
[Tue Apr 24 22:53:17 +11 2018] Removing DNS records.
[Tue Apr 24 22:53:20 +11 2018] Geting existing records for _acme-challenge.unifi-cloudkey.ingram.net.au
[Tue Apr 24 22:53:24 +11 2018] txt record deleted success.
[Tue Apr 24 22:53:24 +11 2018] Verify finished, start to sign.
[Tue Apr 24 22:53:27 +11 2018] Cert success.
-----BEGIN CERTIFICATE-----
MIIGIzCCBQugAwIBAgISA/+S0Nf1rnAPyvs7l7IBJvgtMA0GCSqGSIb3DQEBCwUA
MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD
ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xODA0MjQxMTE2MDJaFw0x
ODA3MjMxMTE2MDJaMCcxJTAjBgNVBAMTHHVuaWZpLWNsb3Vka2V5LmluZ3JhbS5u
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1yepfAhyFCrmFciNs/yxLWQ59GkYze1pdBCcVgB1ANt0r+7LKeyx/so+cW0s5bmq
uzb3hHGDx12dTze2H79kAAABYveVCbEAAAQDAEYwRAIgFJ4rvX0cq8Q+pdKIhCU/
g57uwqqaonUa8hlFmm3RwgkCIArJGAAToRnzSTLa8VS0jKmye5eXpul5LDR7S/XW
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XFvvAEuYC3ruLZIbv4kVa/TglVVBHWMS4RRPFUjieOSR0VbsDjgg
-----END CERTIFICATE-----
[Tue Apr 24 22:53:27 +11 2018] Your cert is in /root/.acme.sh/unifi-cloudkey.ingram.net.au/unifi-cloudkey.ingram.net.au.cer
[Tue Apr 24 22:53:27 +11 2018] Your cert key is in /root/.acme.sh/unifi-cloudkey.ingram.net.au/unifi-cloudkey.ingram.net.au.key
[Tue Apr 24 22:53:28 +11 2018] The intermediate CA cert is in /root/.acme.sh/unifi-cloudkey.ingram.net.au/ca.cer
[Tue Apr 24 22:53:28 +11 2018] And the full chain certs is there: /root/.acme.sh/unifi-cloudkey.ingram.net.au/fullchain.cer
You will now have your certs in the .acme.sh/<certname> directory.
root@UniFi-CloudKey:~/.acme.sh# ll ./unifi-cloudkey.ingram.net.au/
total 44
drwxr-xr-x 2 root root 4096 Apr 24 23:16 .
drwx------ 6 root root 4096 Apr 24 22:50 ..
-rw-r--r-- 1 root root 1647 Apr 24 23:16 ca.cer
-rw-r--r-- 1 root root 3834 Apr 24 23:16 fullchain.cer
-rw-r--r-- 1 root root 2187 Apr 24 23:16 unifi-cloudkey.ingram.net.au.cer
-rw-r--r-- 1 root root 546 Apr 24 23:16 unifi-cloudkey.ingram.net.au.conf
-rw-r--r-- 1 root root 1013 Apr 24 23:15 unifi-cloudkey.ingram.net.au.csr
-rw-r--r-- 1 root root 223 Apr 24 23:15 unifi-cloudkey.ingram.net.au.csr.conf
-rw-r--r-- 1 root root 1679 Apr 24 22:50 unifi-cloudkey.ingram.net.au.key
-rw-r--r-- 1 root root 4397 Apr 24 22:56 unifi-cloudkey.ingram.net.au.pfx
To deploy these to the unifi controller software:
./acme.sh --deploy -d unifi-cloudkey.ingram.net.au --deploy-hook unifi
One that is successful, you should be able to access your cloudkey and check the new certificate:
The Acme Shell will automatically put in a cronjob to renew the cert every three months and deploy to unifi:
root@UniFi-CloudKey:~# crontab -l
46 0 * * * "/root/.acme.sh"/acme.sh --cron --home "/root/.acme.sh" > /dev/null
To confirm that Acme Shell will automatically deploy to unifi, you can run the command from the crontab listing. Without the force option, it will not renew as the cert is still current:
root@UniFi-CloudKey:~# "/root/.acme.sh"/acme.sh --cron --home "/root/.acme.sh"
[Tue Apr 24 23:15:39 +11 2018] ===Starting cron===
[Tue Apr 24 23:15:40 +11 2018] Renew: 'unifi-cloudkey.ingram.net.au'
[Tue Apr 24 23:15:40 +11 2018] Skip, Next renewal time is: Sat Jun 23 11:53:28 UTC 2018
[Tue Apr 24 23:15:40 +11 2018] Add '--force' to force to renew.
[Tue Apr 24 23:15:40 +11 2018] Skipped unifi-cloudkey.ingram.net.au
[Tue Apr 24 23:15:40 +11 2018] ===End cron===
Be careful using the --force option, as Let's Encrypt do throttle connections to avoid abuse. Here is the output from a force run. You will notice that the unifi deployment is automatically run at the end:
root@UniFi-CloudKey:~# "/root/.acme.sh"/acme.sh --cron --force --home "/root/.acme.sh"
[Tue Apr 24 23:15:54 +11 2018] ===Starting cron===
[Tue Apr 24 23:15:54 +11 2018] Renew: 'unifi-cloudkey.ingram.net.au'
[Tue Apr 24 23:15:56 +11 2018] Single domain='unifi-cloudkey.ingram.net.au'
[Tue Apr 24 23:15:56 +11 2018] Getting domain auth token for each domain
[Tue Apr 24 23:15:56 +11 2018] Getting webroot for domain='unifi-cloudkey.ingram.net.au'
[Tue Apr 24 23:15:56 +11 2018] Getting new-authz for domain='unifi-cloudkey.ingram.net.au'
[Tue Apr 24 23:15:59 +11 2018] The new-authz request is ok.
[Tue Apr 24 23:16:00 +11 2018] unifi-cloudkey.ingram.net.au is already verified, skip dns-01.
[Tue Apr 24 23:16:00 +11 2018] Verify finished, start to sign.
[Tue Apr 24 23:16:03 +11 2018] Cert success.
-----BEGIN CERTIFICATE-----
MIIGIzCCBQugAwIBAgISA/+S0Nf1rnAPyvs7l7IBJvgtMA0GCSqGSIb3DQEBCwUA
MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD
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XFvvAEuYC3ruLZIbv4kVa/TglVVBHWMS4RRPFUjieOSR0VbsDjgg
-----END CERTIFICATE-----
[Tue Apr 24 23:16:03 +11 2018] Your cert is in /root/.acme.sh/unifi-cloudkey.ingram.net.au/unifi-cloudkey.ingram.net.au.cer
[Tue Apr 24 23:16:03 +11 2018] Your cert key is in /root/.acme.sh/unifi-cloudkey.ingram.net.au/unifi-cloudkey.ingram.net.au.key
[Tue Apr 24 23:16:04 +11 2018] The intermediate CA cert is in /root/.acme.sh/unifi-cloudkey.ingram.net.au/ca.cer
[Tue Apr 24 23:16:04 +11 2018] And the full chain certs is there: /root/.acme.sh/unifi-cloudkey.ingram.net.au/fullchain.cer
[Tue Apr 24 23:16:05 +11 2018] Generate import pkcs12
[Tue Apr 24 23:16:05 +11 2018] Modify unifi keystore: /usr/lib/unifi/data/keystore
Importing keystore /tmp/tmp.xW8LCyU2nj to /usr/lib/unifi/data/keystore...
Warning: Overwriting existing alias unifi in destination keystore
Warning:
The JKS keystore uses a proprietary format. It is recommended to migrate to PKCS12 which is an industry standard format using "keytool -importkeystore -srckeystore /usr/lib/unifi/data/keystore -destkeystore /usr/lib/unifi/data/keystore -deststoretype pkcs12".
[Tue Apr 24 23:16:10 +11 2018] Import keystore success!
[Tue Apr 24 23:16:10 +11 2018] Run reload: service unifi restart
[Tue Apr 24 23:16:24 +11 2018] Reload success!
[Tue Apr 24 23:16:25 +11 2018] Success
[Tue Apr 24 23:16:25 +11 2018] ===End cron===
If requried after a firmware upgrade:
root@UniFi-CloudKey:~/.acme.sh# ./acme.sh --install-cronjob
[Wed Apr 25 15:02:37 +11 2018] Installing cron job