# Which Problems Are Solved
ZITADEL currently selects the instance context based on a HTTP header
(see https://github.com/zitadel/zitadel/issues/8279#issue-2399959845 and
checks it against the list of instance domains. Let's call it instance
or API domain.
For any context based URL (e.g. OAuth, OIDC, SAML endpoints, links in
emails, ...) the requested domain (instance domain) will be used. Let's
call it the public domain.
In cases of proxied setups, all exposed domains (public domains) require
the domain to be managed as instance domain.
This can either be done using the "ExternalDomain" in the runtime config
or via system API, which requires a validation through CustomerPortal on
zitadel.cloud.
# How the Problems Are Solved
- Two new headers / header list are added:
- `InstanceHostHeaders`: an ordered list (first sent wins), which will
be used to match the instance.
(For backward compatibility: the `HTTP1HostHeader`, `HTTP2HostHeader`
and `forwarded`, `x-forwarded-for`, `x-forwarded-host` are checked
afterwards as well)
- `PublicHostHeaders`: an ordered list (first sent wins), which will be
used as public host / domain. This will be checked against a list of
trusted domains on the instance.
- The middleware intercepts all requests to the API and passes a
`DomainCtx` object with the hosts and protocol into the context
(previously only a computed `origin` was passed)
- HTTP / GRPC server do not longer try to match the headers to instances
themself, but use the passed `http.DomainContext` in their interceptors.
- The `RequestedHost` and `RequestedDomain` from authz.Instance are
removed in favor of the `http.DomainContext`
- When authenticating to or signing out from Console UI, the current
`http.DomainContext(ctx).Origin` (already checked by instance
interceptor for validity) is used to compute and dynamically add a
`redirect_uri` and `post_logout_redirect_uri`.
- Gateway passes all configured host headers (previously only did
`x-zitadel-*`)
- Admin API allows to manage trusted domain
# Additional Changes
None
# Additional Context
- part of #8279
- open topics:
- "single-instance" mode
- Console UI
* take baseurl if saved on event
* refactor: make es mocks reusable
* Revert "refactor: make es mocks reusable"
This reverts commit 434ce12a6a.
* make messages testable
* test asset url
* fmt
* fmt
* simplify notification.Start
* test url combinations
* support init code added
* support password changed
* support reset pw
* support user domain claimed
* support add pwless login
* support verify phone
* Revert "support verify phone"
This reverts commit e40503303e.
* save trigger origin from ctx
* add ready for review check
* camel
* test email otp
* fix variable naming
* fix DefaultOTPEmailURLV2
* Revert "fix DefaultOTPEmailURLV2"
This reverts commit fa34d4d2a8.
* fix email otp challenged test
* fix email otp challenged test
* pass origin in login and gateway requests
* take origin from header
* take x-forwarded if present
* Update internal/notification/handlers/queries.go
Co-authored-by: Tim Möhlmann <tim+github@zitadel.com>
* Update internal/notification/handlers/commands.go
Co-authored-by: Tim Möhlmann <tim+github@zitadel.com>
* move origin header to ctx if available
* generate
* cleanup
* use forwarded header
* support X-Forwarded-* headers
* standardize context handling
* fix linting
---------
Co-authored-by: Tim Möhlmann <tim+github@zitadel.com>
