# ansible-mail-infra

Set up infrastructure for all things e-mail

## Prep

On your Ansible controller make sure the `sshpass` binary exists if Ansible has to connect to target machines via SSH username-password authentication instead of SSH key authentication. The binary usually comes with a package of the same name.

We're assuming that you're running Ansible as a Python package inside a virtual environment. Install Ansible like so:
```
pip install ansible
```

We're also assuming that secrets are stored in a HashiCorp Vault instance to which you have access. These role access Vault via `hvac`, the HashiCorp Vault API client for Python 3.x, see [github.com/hvac/hvac](https://github.com/hvac/hvac) for reference. Install it like so:
```
pip install hvac
```

## Vars

* For default variables copy [ansible/roles/20-common-20-ssh/defaults/main.yml.example](ansible/roles/20-common-20-ssh/defaults/main.yml.example) to a proper `ansible/roles/20-common-20-ssh/defaults/main.yml`, adjust as needed.

* Create your inventory, copy [ansible/hosts.yml.example](ansible/hosts.yml.example) to a proper `ansible/hosts.yml` file with at least one host in host group `all`.

* Replace [ansible/group_vars/all/vars.yml.example](ansible/group_vars/all/vars.yml.example) with a proper `ansible/group_vars/all/vars.yml` file and set at least `ansible_user` and Vault access variables.

* In [ansible/roles/20-common-20-ssh/files/root/.ssh](ansible/roles/20-common-20-ssh/files/root/.ssh) copy both [authorized_keys.example](ansible/roles/20-common-20-ssh/files/root/.ssh/authorized_keys.example) and [known_hosts.example](ansible/roles/20-common-20-ssh/files/root/.ssh/known_hosts.example) to proper files. They contain SSH authorized_keys and public SSH host keys you want installed on target machines.

## Vault structure

In Vault we're assuming that every host in your inventory has a secret stored that contains at least the following keys:

* `initial_password`: The operating system's local account password at machine creation. Ansible will use this to SSH into the machine during `first_run`, see section [Run it](#run-it) below.
* `password`: The new password you want to set for the operating system's local account.
* `password_salt`: The salt you're going to use. We're hashing the password with SHA-512, the salt is a string of up to 16 characters length.

For an example server `fully.qualified.domain.name` and example user `root` Vault secrets are located at `name/domain/qualified/fully/os/root/creds`. Per [ansible/group_vars/all/vars.yml.example](ansible/group_vars/all/vars.yml.example) the default secrets engine mount point is `kv` where this playbook expects a kv secrets engine.

## Run it

On first run execute it like so:
```
ansible-playbook --tags 'first_run' --inventory hosts.yml playbook.yml
```

The `first_run` tag ensures that `ansible_password` variable gets set which in turn causes Ansible to log in to target machines via SSH username-password authentication.

On subsequent runs like so:
```
ansible-playbook --inventory hosts.yml playbook.yml
```