myxce/.wolf/bugs/bug-1875.md

id	status	status_updated	status_note	component	severity	timestamp	last_seen	occurrences	files	tags	related	fix_commits	gitea_issue	gitea_synced_status	gitea_synced_hash
bug-1875	fixed	2026-09-28		apiserver	noise	2026-09-28T03:52:37Z	2026-09-28T03:58:49Z	1	src/frontend/apiserver/middleware/startserver.go	apiserver auth pam logging		44173f74	313	fixed	215a5c77313a

bug-1875: apiserver warns PAM needs root when the auth provider is not pam

Description

Observed:

2026-09-28T11:52:50.031+0800 WARN Not running as root — PAM authentication will not work. OK for dev/testing.

Expected: no warning when the configured auth provider is not pam (the default config/auth.yaml has provider: config_file). Impact: a misleading WARN on every non-root apiserver start; noise only. Found by: user report from a pc13v HA deploy, 2026-09-28

Environment

• OS: no /etc/os-release; Docker container; NixOS kernel; kernel Linux 6.18.33 x86_64
• libc: glibc 2.42-47 (interpreter /nix/store/wb6rhpznjfczwlwx23zmdrrw74bayxw4-glibc-2.42-47/lib/ld-linux-x86-64.so.2, from src/xce.build/frontend/apiserver/xce_apiserver)
• Toolchain: gcc (GCC) 15.2.0, meson 1.9.1
• Build: release-style Go build via meson (xce.build/frontend/apiserver/xce_apiserver)
• Code: scheduler-framework @ 8cadeeb2 (last commit without the fix)
• Deployment: first seen on pc13v: 3-node HA (ctrl-1..3) + scheduler + apiserver + real root xcecd under systemd, deploy dir /tmp/xce-ha-deploy, 2026-09-28 11:52 +0800 (pc13v's OS, libc and exact commit were not recorded; the values above are from the reproduction on this dev host, same nix toolchain)

Reproduction

1. Start the apiserver as a non-root user with the default src/frontend/apiserver/config/auth.yaml (provider: config_file)
2. The warning is logged at start

• Frequency: deterministic (every non-root start)
• Evidence: the xcecd/scheduler/controller/apiserver logs pasted in the user's report, 2026-09-28 (quoted above)

Root cause

StartServer() (src/frontend/apiserver/middleware/startserver.go) warned whenever the uid was not 0, without looking at which auth provider cmd/main.go had initialized (auth.GlobalProvider) -- only the PAM provider needs root.

Fix

rootWarning(uid, provider) returns the warning only for provider "pam" and a non-root uid; StartServer() passes auth.GlobalProvider.Name().

Verification

• Test: TestRootWarning in src/frontend/apiserver/middleware/startserver_test.go (5 uid/provider cases): RED before the fix (rootWarning did not exist), GREEN after; run with CGO_ENABLED=0 go test ./middleware/ -run TestRootWarning (the package's TestLoadJobs needs a live apiserver and is not part of the normal Go test set)
• Suites: full ASAN build (xce-build all): 113/113 suites after the updated scheduler picker-registration test; controller 1250/0, harness 141/0, worker diskstats 4/0, scheduler picker wiring 11/0 + picker registration 4/0, apiserver TestRootWarning PASS
• Live: pc13v retest at 4c134127 (debug build, 2026-09-28 14:47 +0800): ag -i error logs/ finds nothing; ag -i warn logs/ shows only the WAL-unencrypted advisory; no PAM warning from the apiserver

References

• Related: none