[v18] fix: Prevent an App from setting a public address that conflicts with a Teleport Proxy public address 👮#58766
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cthach merged 3 commits intobranch/v18from Sep 5, 2025
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… a Teleport Proxy public address 👮🏾 (#58475) * fix: apps should not be able to set public_addr to the web proxy address Signed-off-by: Chris Thach <chris.thach@goteleport.com> * feat: add API validation Signed-off-by: Chris Thach <chris.thach@goteleport.com> * test: add coverage for UpsertApplicationServer Signed-off-by: Chris Thach <chris.thach@goteleport.com> * refactor: polish Signed-off-by: Chris Thach <chris.thach@goteleport.com> * refactor: make consistent Signed-off-by: Chris Thach <chris.thach@goteleport.com> * refactor: use ValidateApp func everywhere. Revert changes to Check* method. Signed-off-by: Chris Thach <chris.thach@goteleport.com> * refactor: dedupe Signed-off-by: Chris Thach <chris.thach@goteleport.com> * refactor: improve error messages for application address conflicts and add validation check in connections handler Signed-off-by: Chris Thach <chris.thach@goteleport.com> * ux: bubble up friendly error to UI Signed-off-by: Chris Thach <chris.thach@goteleport.com> * refactor: revert unnecessary change * fix: app public address in redirect Signed-off-by: Chris Thach <chris.thach@goteleport.com> * fix: streamline proxy address validation in ValidateApp function Signed-off-by: Chris Thach <chris.thach@goteleport.com> * refactor: remove contact cluster admin in favor of self-service. Add logging. Signed-off-by: Chris Thach <chris.thach@goteleport.com> * Apply suggestions from code review Co-authored-by: rosstimothy <39066650+rosstimothy@users.noreply.github.com> * fix: skip proxy servers with unset public addresses in ValidateApp function Signed-off-by: Chris Thach <chris.thach@goteleport.com> * refactor: simplify error messages for application public address conflicts with proxy Signed-off-by: Chris Thach <chris.thach@goteleport.com> * fix: logging in the wrong spot Signed-off-by: Chris Thach <chris.thach@goteleport.com> * fix: handle when a server has multiple public addrs Signed-off-by: Chris Thach <chris.thach@goteleport.com> --------- Signed-off-by: Chris Thach <chris.thach@goteleport.com> Co-authored-by: rosstimothy <39066650+rosstimothy@users.noreply.github.com>
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Backport #58475 to branch/v18
Fixes https://github.com/gravitational/teleport-private/issues/2104
changelog: Prevents an application from being registered if its public address matches a Teleport cluster address.