fixes https://github.com/TryGhost/Ghost/issues/14508
This change requires the frontend to send an explicit `emailType` when sending a magic link. We default to `subscribe` (`signin` for invite only sites) for now to remain compatible with the existing behaviour.
**Problem:**
When a member tries to login and that member doesn't exist, we created a new member in the past.
- This caused the creation of duplicate accounts when members were guessing the email address they used.
- This caused the creation of new accounts when using an old impersonation token, login link or email change link that was sent before member deletion.
**Fixed:**
- Trying to login with an email address that doesn't exist will throw an error now.
- Added new and separate rate limiting to login (to prevent user enumeration). This rate limiting has a higher default limit of 8. I think it needs a higher default limit (because it is rate limited on every call instead of per email address. And it should be configurable independent from administrator rate limiting. It also needs a lower lifetime value because it is never reset.
- Updated error responses in the `sendMagicLink` endpoint to use the default error encoding middleware.
- The type (`signin`, `signup`, `updateEmail` or `subscribe`) is now stored in the magic link. This is used to prevent signups with a sign in token.
**Notes:**
- Between tests, we truncate the database, but this is not enough for the rate limits to be truly reset. I had to add a method to the spam prevention service to reset all the instances between tests. Not resetting them caused random failures because every login in every test was hitting those spam prevention middlewares and somehow left a trace of that in those instances (even when the brute table is reset). Maybe those instances were doing some in memory caching.
refs https://github.com/TryGhost/Team/issues/2024
Without validation it was possible to send a string of comma separated
email addresses to the endpoint, and an email would be sent to each
address, bypassing any rate limiting.
This bug does not allow for an authentication bypass exploit. It is purely a
spam email concern.
Credit: Sandip Maity <maitysandip925@gmail.com>
refs https://github.com/TryGhost/Team/issues/1174
This paves the way for Ghost to be able to redirect to the referrer
page when dealign with signup magic links. We pass the referrer for
all types of magic links however, to allow extension of this
functionality in the future.
We've also removed the concept of `requestSrc` which has been unused
for a while now.
refs: 23b383bedf
- @tryghost/error constructors take an object, not a string - the expectation is that message, context & help should all be set
- This does the bare minimum and just ensures message is set correctly
