Add bytes option for Windows MDM config

[noahtalerman]

Goal

User story
As a Fleet contributor,
I want to be able to set the required configuration option values as bytes
so that I can dogfood Windows MDM features.

Changes

• [x] Add FLEET_MDM_WINDOWS_WSTEP_IDENTITY_CERT_BYTES and FLEET_MDM_WINDOWS_WSTEP_IDENTITY_KEY_BYTES configuration options. These are the bytes equivalent of the existing FLEET_MDM_WINDOWS_WSTEP_IDENTITY_CERT and FLEET_MDM_WINDOWS_WSTEP_IDENTITY_KEY file path options.
• [ ] Add docs for the bytes options (above). We don't need to document filepath options.
• [ ] These docs should call out that Windows MDM features are in development and not ready for production.

Context

While the file path options work great during development, it's difficult to have the dogfood environment accept the file path options.

This is just a fix for dogfooding Windows MDM. The plan for launch is to auto magically generate and apply these certs for the user. This will take significant effort and we want to unblock dogfooding sooner.

Engineering

• [ ] REST API changes: TODO
• [ ] Database schema migrations: TODO
• [ ] Documentation changes complete

Product quality

• [ ] QA complete

Context

• Requestor(s): _____

QA

Risk assessment

• Requires load testing: TODO
• Risk level: Low / High TODO
• Risk description: TODO

Manual testing steps

1. Step 1
2. Step 2
3. Step 3

Testing notes

Confirmation

1. [ ] Engineer (@____): Added comment to user story confirming succesful completion of QA.
2. [ ] QA (@____): Added comment to user story confirming succesful completion of QA.

[georgekarrv]

Hey team! Please add your planning poker estimate with Zenhub @ghernandez345 @gillespi314 @roperzh

[sabrinabuckets]

@gillespi314 I thought this morning that I had a better handle on how to test this, but after a couple of discussions I realize I do not. Any chance we can get a call together tomorrow to run through it?

[sabrinabuckets]

Validated able to successfully start Fleet and enroll a Windows host into MDM with the BYTES env variables.

Additional testing notes: Tested with incorrect env var formatting and received expected error. Tested with incorrect values set & received expected error. Tested starting with the cert variable set & key flag, received an error. Tested with key variable set & cert flag, was able to run Fleet successfully.

[zhumo]

C&C Hey @gillespi314 would you document these changes? cc @noahtalerman

[noahtalerman]

UPDATE: Hey @gillespi314, @ireedy is writing the docs for these changes.

[noahtalerman]

Confirm and celebrate: @ireedy just checking in, how are docs going?

[ireedy]

@noahtalerman PR submitted for your review!

[ireedy]

C&C: can close!

[fleet-release]

Config bytes now set, Unblocks Windows MDM test, Progress without fret.