embyDDNS

embyDDNS is a Docker container based off of the phusion-passenger image that contains a BIND9 server and the necessary API to interact with LetsEncrypt.org to obtain an SSL/TLS certificate for client EmbyServers.

DOES NOT ISSUE CERTIFICATES YET. Currently Let'sEncrypt does not yet have the DNS-01 challenge implemented in the production server. Once it is implemented, this repo will be updated. For now this will only act as a DDNS. Feel free to test it out and leave issues to help me make it more robust.

Useage

Building image (./build.sh):

docker build -t embyddns --rm=true .

Running the container (./run.sh):

docker run -d --net=host -e "DDNS=ddns.host.com" --name EmbyDDNS embyddns

Where -e represents a subdomain with a widely resolvable A name. This must be a sub domain of a host under a TLD. "emby.media" will not work here. It must be "DDNS.emby.media"

There must also be a resolvable nameserver associated with this sub domain witht eh name "ns1". Example: "ns1.ddns.host.com"

API

The API is laid out as follows:

Server Public Key

url={host}:5000/api/v0.1/publickey Type=GET

returns=PEM encoded public key of server (publickeystring)

Register Client's Hostname

url= {host}:5000/api/v0.1/register type=POST

*returns=URL Code, Message 201 = Hostname registered successfully 409 = Hostname already exists. (OK) 400 = Bad Request, Server did not understand, (look at return message)

Update IP address

url= {host}:5000/api/v0.1/update type=POST

*returns=URL Code, Message 201 = Hostname registered successfully 409 = Hostname already exists. (OK) 400 = Bad Request, Server did not understand, (look at return message)

Get Certificate (currently only creates DNS TXT record)

url={host}:5000/api/v0.1/getcert* type=POST

returns base64 encoded certificate in PFX format

POST body format body=JWT with claims encrypted with server public key:

jwk= {'k' : "publickeystring"}

claims = {
    'hostname': "hostname",
    'pubkey': "publickey",
    'alg' : "alg",
    'secret' : "secret",
    'ipaddr' : "ipaddr",
}

Where : "hostname"= String(subdomain of user) "publickey= Base64(DER encoded client public key) "alg"= String('hmac-md5') "secret"= Base64(MD5-HMAC of hostname signed with client's RSA private key) "ipaddr"= String(Public IP address of subdomain trying to register with this DDNS)