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Ansible Node - Enforce private key permission and bind permissions to scylla user #141

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When the source playbook is executed with become: True its relevant TLS certificates will be owned by root. This causes a problem, because later on when trying to copy we are unable to read the resulting private key file, as it is (correctly) created by default with mode 0600.

This commit let Ansible generate each PKI component with mode 0644. Then, ensure these are copied to the remote machine's with strict permissions to scylla user/group. Finally, ensure that the private key is only readable by its target user - both locally and remotely.

Fixes #139

- "./ssl/{{ inventory_hostname }}/{{ inventory_hostname }}.pem"

- name: Secure local OpenSSL private key
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Why is this needed? Don't we want to cleanup after ourselves?

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Makes sense. Updated to delete private key. Do notice we must still keep the private CA key for add-node operations, for instance.

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I'm not following why would you need to keep any key after you copied it to remote nodes?
We are going to re-generate all keys from scratch every time we execute the Role anyway, don't we?

… scylla user

When the source playbook is executed with `become: True` its relevant TLS certificates will be owned by root. This causes a problem, because later on when trying to copy we are unable to read the resulting private key file, as it is (correctly) created by default with mode 0600.

This commit let Ansible generate each PKI component with mode 0644. Then, ensure these are copied to the remote machine's with strict permissions to scylla user/group. Finally, ensure that the private key is only readable by its target user - both locally and remotely.

Fixes scylladb#139
- "./ssl/{{ inventory_hostname }}/{{ inventory_hostname }}.pem"

- name: Delete local OpenSSL private key
file:
path: "./ssl/{{ inventory_hostname }}/{{ inventory_hostname }}.pem"
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What's the point of keeping any file under .ssl on the localhost?

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TLS - Private key (insecure) copy fails when ansible is ran as a regular user
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