luks2crypt

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Manage linux luks client devices and escrow recovery keys to crypt-server

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Luks2Crypt
==========

- https://golang.org/cmd/cgo/

- https://gitlab.com/cryptsetup/cryptsetup/-/blob/v2.2.2/lib/libcryptsetup.h

Luks2crypt is used to manage luks client devices and allow escrowing to a
[crypt-server](https://github.com/grahamgilbert/Crypt-Server). Currently, it
implements some functionality similar to [Crypt2](https://github.com/grahamgilbert/crypt2).

`postimaging`:

- gathers system info (serial number, username, hostname)

- generates a random password

- test if the password passed in on the cli unlocks the disk

- caches the new password to `/etc/luks2crypt/crypt_recovery_key.json`

- uploads the new password to your local crypt-server

- changes the luks password passed in on the cli to the newly generated one

Dependencies
------------

Luks2crypt requires a pre-existing crypt-server to escrow keys. Crypt-server is
a Django web service for centrally storing recovery keys for full disk
encryption. See: https://github.com/grahamgilbert/Crypt-Server for more details.

Usage
-----

Setting the admin password and escrowing it post imaging:

sudo luks2crypt postimaging \
      --luksdevice "<device_to_manage>" \
      --currentpassword "<password_to_replace>" \
      --cryptserver "<cryptserver.example.com>"

If your Crypt server uses basic authentication to protect the checkin endpoint:

sudo luks2crypt postimaging \
      --luksdevice "<device_to_manage>" \
      --currentpassword "<password_to_replace>" \
      --cryptserver "<cryptserver.example.com>" \
      --authuser "<basic auth username>" \
      --authpass "<basic auth password>"

If you omit the password, luk2crypt will prompt for one.

Development
-----------

- This repository uses go modules (https://github.com/golang/go/wiki/Modules).
You should be able to simply `go get` the repo and the dependencies will
auto install. You will need to be using go version 1.11 or higher.

- The cryptsetup libs are required to build. Cryptsetup C libraries are used
through cgo to manage the encrypted devices. On debian/ubuntu you can run:

sudo apt install libcryptsetup-dev

- To prepare for a release by cleaning up the unused dependencies run:

make deps

- Use the `Makefile` to test and build luks2crypt:

make

- If you would like to use a mock crypt server to test client changes on is
  included in this project:

make mockserver

- If you need a test environment, the provided `Vagrantfile` creates an ubuntu
  vm. The vagrantfile has a provision script that creates a luks disk image at
  `/home/vagrant/luks-dev-disk.img`. The image is then encrypted with the password
  "devpassword" and mounted at `/mnt`.

make devup       # create the dev vm
      make devssh      # connect to the consule of the vm
      make devclean    # delete the vm

This also includes a mock implimentation of crypt-server to log the form
  data to stdout. You can launch the dev environment as follows:

make devup
      make devssh
      sudo cryptservermock  # start the mock crypt-server
      
      # in a new term window test the client
      make devssh
      sudo /vagrant/bin/luks2crypt postimaging \
        -l ./luks-dev-disk.img \
        -p devpassword \
        -s ubuntu-focal:8443

You should then see the form post data printed to stdout from
  `cryptservermock`.

Releasing
---------

This repo uses the [relase-please](https://github.com/googleapis/release-please)
action. Release please leverages [conventional commits](https://www.conventionalcommits.org)
formatting to automatically collect release notes to create the next semver tag.
Once the release pr is merged release please will tag the next version and run
goreleaser which will automatically build the binaries and attach them to the
github release. The release pr will continue to collect changes since the last
time a release was tagged.

1. Create and merge any number of prs to main following conventional commits
formatting. You can continue to merge changes to main and release please will
continue to append changes to the open release pr since the last release was
tagged.
2. When you are ready to release the changes created in step 1,
[merge the open release pr](https://github.com/square/luks2crypt/labels/autorelease%3A%20pending).
This will trigger CI to create a new tag and github release. CI will also run
[goreleaser](https://goreleaser.com) which will build the binaries and update
the github release with the artifacts.
3. The changes merged in step 1 are now available on the
[latest github release](https://github.com/square/luks2crypt/releases/latest)

License
-------

This program is free software: you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation, either version 3 of the License, or
      (at your option) any later version.

This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU General Public License for more details.

You should have received a copy of the GNU General Public License
      along with this program.  If not, see <http://www.gnu.org/licenses/>.

luks2crypt

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