chore: scrub identifiers from the tree and close the .gitignore gaps

[kyaky]

Housekeeping found while auditing the repo before pushing. Nothing here is a live credential, and there is nothing to revoke — but all of it is on a public repo today.

Identifiers → documentation space

was	now	where
z3502076@ad.unsw.edu.au	alice@ad.example.edu	build_openconnect_cookie doc comment + 3 assertions
ra.vpn.unsw.edu.au	ra.vpn.example.com	wintun_cleanup module doc
172.26.6.44 / .45	198.51.100.44 / .45	main.rs, gp-tunnel HIP-mismatch docs

The student ID is the one that actually matters — it is an account identifier, and the test only ever needed a username containing @. The others are a real production portal FQDN and two addresses a real gateway assigned from its internal pool; in each case the doc's argument is independent of the value.

(129.94.0.230 / 129.94.0.0/16 in the gp-route tests get the same treatment in #29 — that PR rewrote most of those same lines, so splitting it here would only have produced a conflict.)

The SAML fixture — worth reading before you skim past it

crates/gp-auth/src/saml_common.rs carried a base64 globalprotectcallback: blob that decodes to:

<prelogin-cookie>DKo1IZhfS9/EWg5u3htt…UoiqOg==</prelogin-cookie>
<saml-username>xxxxxxxxxxxx.com</saml-username>

52 bytes of high-entropy data next to a username that had been hand-blanked — the signature of a capture that was only half redacted. I traced it: it is verbatim from yuezk/GlobalProtect-openconnect#431, a public bug report where a third party pasted their callback string and scrubbed the username but not the cookie.

So: not ours, long expired, already public, nothing to revoke. Republishing someone else's bearer token as a test fixture is still not something to leave in place. Replaced with a synthetic blob of identical shape and element order; verified it round-trips through the same parser and the assertions still exercise the same path.

.gitignore — three gaps, each confirmed with git check-ignore -v

1. /target was root-anchored. So crates/*/target/ and bins/*/target/ were not ignored, and two per-crate rules had been bolted on after the fact. That is exactly how 710 blobs of Windows build output (58 MiB of pack) reached this repo's history. One un-anchored target/ covers every depth, now and for whatever gets added later.

2. A bare config.toml matches at every depth — including .cargo/config.toml, which this repo has a real use for (release.yml sets OPENCONNECT_DIR / LIBCLANG_PATH per job; the natural refactor is a checked-in [env] block). A git add would have silently done nothing and CI would have failed on a linker error with no hint pointing at .gitignore. Now anchored — and config.toml.tmp is covered too, which Config::save_to writes before its rename and which holds the portal URL, username and Okta tenant.

3. No release-packaging output was ignored (dist/, dll-cache/, wintun-extract/, the tarballs). Reproducing a release build locally — the obvious move when a release job fails — leaves a directory of binaries next to a git add -A.

The credential globs stay deny-by-default but now re-admit **/tests/fixtures/**. PortalProfile already has client_cert / client_key fields and client-certificate auth is a planned item, so a synthetic fixture cert is a near-term certainty — and it would currently fail to stage with no visible reason.

Verified git ls-files | git check-ignore --stdin is empty: no currently-tracked file becomes ignored.

Verification

cargo test --workspace --locked → 268 passed · cargo clippy --workspace --all-targets -- -D warnings → clean · cargo fmt --all --check → clean

Two things this cannot fix — your call

Both need git filter-repo and a force-push, which rewrites every SHA and breaks open PRs and existing clones. Deliberately not attempted:

1. frank.li@unsw.edu.au is the author and committer of 28 of 186 commits. Commit metadata is not reachable by editing files — a .mailmap changes local git log rendering, but GitHub still serves the original author line on every commit page and through the API. Fixing it means git filter-repo --mailmap. (andylizf@outlook.com should be left alone — that is an outside contributor's own chosen identity.)
2. bins/pgn-tray/target/ still holds those 710 blobs, including 25 .pdb files embedding C:\Users\kyaky\Documents\Playground\pangolin\…. Dropping them also takes ~58 MiB off every future clone.

Related: the message on 8572dfb ("security: remove session archives from repo") is wrong in both directions. It claims the archives were removed from tracking and remain in history; in fact git show --stat shows it changed .gitignore and nothing else, and .session-archives/ has never existed anywhere in history. The ignore rule is correct and preventive, so it stays — but no BFG pass is needed for it. The two items above are the real ones.