Resolves https://github.com/fleetdm/fleet/issues/48378 (issue found
while working on the Google Workspace IdP integration).
## Summary
Fixes a bug where an IdP user associated with **multiple hosts** only
had IdP host vitals populated on **one** of them.
`maybeAssociateScimUserWithHostMDMIdP` (called when a SCIM/IdP user is
created) matched all hosts whose MDM IdP account corresponds to the
user, but then deliberately linked only `hostIDs[0]` (with a `// TODO:
confirm desired behavior` / "just use the first one"). So when a user is
created *after* the hosts already enrolled — e.g. a directory sync
creating users for people who each have a laptop and a desktop — only
the first host got a `host_scim_user` row, and therefore only that host
received the user's IdP host vitals and profile-variable resends.
The fix links **every** matching host. `associateHostWithScimUser` is
keyed on `host_id` (`INSERT … ON DUPLICATE KEY UPDATE`) and triggers its
own per-host profile resend, so calling it once per host is safe and
idempotent.
This is shared SCIM linking code, so the fix benefits all IdP sources
(Okta/Entra SCIM as well as the Google Workspace directory sync that
surfaced it). Deletes and updates already handled multiple hosts
correctly; only the initial reverse-link was capped.
## Testing
Added `testScimUserCreateAssociatesAllMatchingHosts`
(`server/datastore/mysql/scim_test.go`): two hosts share one MDM IdP
account, then a SCIM user is created — both hosts must resolve to it via
`ScimUserByHostID`. Fails before the fix (host #2 unlinked), passes
after.
**Related issue:** Resolves#48378
# Checklist for submitter
- [x] Changes file added for user-visible changes in `changes/`.
- [x] Input data is properly validated, `SELECT *` is avoided, SQL
injection is prevented (using placeholders for values in statements).
## Testing
- [x] Added/updated automated tests
- [X] QA'd all new/changed functionality manually
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
* **Bug Fixes**
* SCIM/IdP user provisioning now associates a new SCIM user with **all**
matching hosts, not just the first match.
* Host end-user details (including IdP username/full name) are now
populated consistently on every associated host.
* **Tests**
* Added SCIM integration and datastore regression coverage to ensure
multiple hosts linked to the same IdP account are all associated during
user creation.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
