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feat(encrypt): Allow customization of the cipher

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Extend the old LEP `pv-encryption.md` to allow users customize the
options of cipher used by `cryptsetup`.

Longhorn 3353

Signed-off-by: James Lu <james.lu@suse.com>
This commit is contained in:
James Lu 2022-10-24 17:18:38 +08:00 committed by David Ko
parent c3095ee6e0
commit 6de8c36fba
1 changed files with 28 additions and 9 deletions
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25
enhancements/20210726-pv-encryption.md → enhancements/20221024-pv-encryption.md
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@ -16,7 +16,7 @@ this in return means that backups of that volume end up also being encrypted.
## Motivation
### Goals
- user is able to create & use an encrypted volume
- user is able to create & use an encrypted volume with cipher customization options
- user is able to configure the keys that are used for encryption
- user is able to take backups from an encrypted volume
- user is able to restore an encrypted backup to a new encrypted volume
@ -35,7 +35,7 @@ how to create and use an encrypted volume.
#### Create and use an encrypted volume
- create a storage class with (encrypted=true) and either a global secret or a per volume secret
- create the secret for that volume in the configured namespace
- create the secret for that volume in the configured namespace with customization options of the cipher for instance `cipher`, `key-size` and `hash`
- create a pvc that references the created storage class
- volume will be created then encrypted during first use
- afterwards a regular filesystem that lives on top of the encrypted volume will be exposed to the pod
@ -85,6 +85,9 @@ metadata:
stringData:
CRYPTO_KEY_VALUE: "Simple passphrase"
CRYPTO_KEY_PROVIDER: "secret" # this is optional we currently only support direct keys via secrets
CRYPTO_KEY_CIPHER: "aes-xts-plain64" # this is optional
CRYPTO_KEY_HASH: "sha256" # this is optional
CRYPTO_KEY_SIZE: "256" # this is optional
```
#### Create storage class that utilizes per volume secrets
@ -120,10 +123,18 @@ Storing the `Encrypted` value is necessary to support encryption for RWX volumes
### Implementation Overview
Host requires `dm_crypt` kernel module as well as `cryptsetup` installed.
We utilize the below parameters from a secret, `CRYPTO_KEY_PROVIDER` allows us in the future to add other key management systems.
We utilize the below parameters from a secret,
- `CRYPTO_KEY_PROVIDER` allows us in the future to add other key management systems
- `CRYPTO_KEY_CIPHER` allow users to choose the cipher algorithm when creating an encrypted volume by `cryptsetup`
- `CRYPTO_KEY_HASH` specifies the hash used in the LUKS key setup scheme and volume key digest
- `CRYPTO_KEY_SIZE` sets the key size in bits. The argument has to be a multiple of 8 and the maximum interactive passphrase length is 512 (characters)
```yaml
CRYPTO_KEY_VALUE: "Simple passphrase"
CRYPTO_KEY_PROVIDER: "secret" # this is optional we currently only support direct keys via secrets
CRYPTO_KEY_CIPHER: "aes-xts-plain64" # this is optional
CRYPTO_KEY_HASH: "sha256" # this is optional
CRYPTO_KEY_SIZE: "256" # this is optional
```
- utilize host `dm_crypt` kernel module for device encryption
@ -146,6 +157,14 @@ We utilize the below parameters from a secret, `CRYPTO_KEY_PROVIDER` allows us i
- create a pod that uses that pvc for a volume mount
- wait for pod up and healthy
#### Successful Creation of an encrypted volume with customization of the cipher
- create a storage class with (encrypted=true) and either a global secret or a per volume secret
- create the secret with customized options of the cipher for that volume in the configured namespace
- create a pvc that references the created storage class
- create a pod that uses that pvc for a volume mount
- wait for pod up and healthy
- check if the customized options of the cipher are correct
#### Missing Secret for encrypted volume creation
- create a storage class with (encrypted=true) and either a global secret or a per volume secret
- create a pvc that references the created storage class