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A tool to load and update https certificates on Brother printers.

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# Brother Cert MFC-L2710DW

Brother Cert is a command line tool to automatically install an ssl certificate on a Brother 
MFC-L2710DW printer.

## Compatibility Notice

**PRs and Issues for anything other than bug fixes, will likely be ignored.**

This tool is not actively updated for additional printer models and should be forked and modified if you're
trying to use it for a different model. Requests for additional support will likely be ignored.

The tool was built specifically for the Brother MFC-L2710DW printer. It 
seems reasonable other Brother printers probably use similar mechanisms but your mileage may vary.

It may be easiest to manually perform the initial configuration of SSL on the printer before attempting
to use this tool for subsequent updates. However, this is not required. The only required manual step
is to install the root CA for the certificates you plan to use.

## Usage

The tool will:
1. Connect to the printer,
2. Convert the pem files into p12 format,
3. Upload the p12 to the printer,
4. Activate https using the new certificate,
5. Restart the printer, and
6. Delete the previously active certificate.

Run the tool as:

`./brother-cert --hostname printer.example.com --password secret --keyfile key.pem --certfile cert.pem [FLAGS]`

Help can be viewed with:

`./brother-cert --help`

### Initial SSL Setup

It is likely easiest to perform the initial setup of SSL on the printer manually, prior to using this tool
to manage the certificate(s) moving forward. However, it is not required. The only required manual step is
uploading the root CA (step #1) and setting the TLS version (optional step #5).

1. On the printer Web UI, login and navigate to `Network > Security > CA Certificate` and upload the root
   certificate PEM file corresponding to the certificates you will use. (Upload the root only, intermediate
   certificates should not be included in this step.)
2. Create an RSA (NOT ECDSA) private key and corresponding certificate. A bit size of 2,048 is recommended
   as the printer has limited space to store certificates.

> [!IMPORTANT]
> WARNING: If your certificate does not have a Common Name, it may not work. The certificate will upload to
> the printer, but the certificate may not be listed in the `Select the Certificate` dropdown that is used
> later in this procedure. Either create a certificate with a Common Name for the initial configuration
> or perform the initial configuration using this command line tool instead.

3. Convert your private key and certificate into the pkcs12 format using OpenSSL: 
   `openssl pkcs12 -export -inkey key.pem -in cert.pem -out printer.p12`
4. Navigate to `Network > Security > Certificate` and click `Import Certificate and Private Key`. Upload the
   p12 file you just generated and click submit. (If your file has a password, ensure you input it in the box.)
5. Optional but Strongly Recommended: Navigate to `Network > Security > TLS Settings` and set both Server and
   Client to `TLS 1.2`.
6. Navigate to `Network > Network > Protocol` and click `HTTP Server Settings`. Select your certificate from
   the dropdown box and click submit. Ensure the `Activate other protocols that have secure settings.` box is
   checked and click `Yes` to load the certificate and reboot the printer.

## Note About Install Automation and Securing Credentials

The application supports passing all args instead as environment variables by prefixing the flag name with `BROTHER_CERT`.
This allows for cloud native uses and also compatibilty with scripting tools that can securely store credentials
in environmental variables.

e.g. `BROTHER_CERT_KEYPEM`

### Required ARGs

- `BROTHER_CERT_KEYPEM={{PRIVATE_KEY_PEM}}`
- `BROTHER_CERT_CERTPEM={{CERTIFICATE_PEM}}`
- `BROTHER_CERT_HOSTNAME=printer.example.com`
- `BROTHER_CERT_PASSWORD=secret`

There are mutually exclusive flags that allow specifying the pem 
as either filenames or directly as strings. The strings are useful 
for passing the pem content from another application without having 
to save the pem files to disk.

Putting all of this together, you can combine the install binary with 
a tool like Cert Warden (https://www.certwarden.com/) to call the 
install binary, with environment variables, to directly upload new 
certificates as they're issued by Cert Warden, without having to write a 
separate script.

![Cert Warden with Brother Cert](https://raw.githubusercontent.com/gregtwallace/brother-cert/master/img/brother-cert.png)

## Building

Python3, Go, and git all must be installed to run the build script.

Once the dependencies are installed, clone this repo and run 
`python build_release.py`. If you only want to build for certain OS or
ARCH targets, edit the `targets` array in the `build_release.py` file
before running it.

## Links

@Owl-Tec's write up & experience using this tool: 
https://owltec.ca/Other/Installing+a+Let's+Encrypt+TLS+certificate+on+a+Brother+printer+automatically+with+Certbot+(%26+Cloudflare)

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