this post was submitted on 13 Aug 2024
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Privacy
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The simple answer to SSO is: Just don't.
It has it's place in companies, but there is no good reason for private use, except maybe a little convenience.
On the other hand, you open yourself up of to your data being collected left and right and increase the chance it gets compromised by it being shared.
SSO can be fine, it all depends on how it is implemented. If you run your own OIDS or manage your own FIDO2 keys manually, SSO works great; it means that every time you access an online account, a different challenge/response is sent, but you only have to manage a single account on your end. This means less data to be stolen, and if implemented correctly, a sso-backed login attempt in a new context will require further action, preventing someone from just stealing your cookies/certificates and having full access to all your accounts.
The problem is that so much SSO junk is intentionally mis-implemented to include third parties in the process where there’s no need for them to be. Avoid those where appropriate.
Ok, fair enough, but at that point you're basically deploying your own password manager which most people would consider a little over the top :D
The only acceptable use I have seen for myself are trading sites you log in through Steam - since their sole purpose is interacting with your Steam inventory.