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feat(host-agent): Phase 1c — SteamCMD update + jailed file manager

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steam_update func runs SteamCMD per game (rust/conan/soulmask app-ids;
dune rejected), streaming stdout to {instance}.steam_status. Jailed
file manager on {instance}.files.cmd: list/read/write/delete/rename/
mkdir/mkfile/move/copy, all confined to instance root via two-stage
lexical-normalize + canonicalize (defeats ../ traversal AND symlink
escape — incl chained symlinks). Replaces the Go agent's UNJAILED
legacy files API (retired, not ported). 5MiB read cap.

42/42 tests green: 24 filemanager incl 7 jail-escape attempts
(dotdot, deep dotdot, absolute, symlink-inside, direct symlink,
chained symlink), 5 steamcmd app-id (cfg-gated win/linux soulmask).
Jail logic reviewed line-by-line: Path::starts_with is component-wise
(no sibling-prefix bypass), non-existent suffix components can't be
symlinks, leading .. normalizes to / and fails the prefix check.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Vantz Stockwell
2026-06-11 11:51:46 -04:00
parent 9e5e828c8d
commit 18f978dde1
14 changed files with 1508 additions and 10 deletions
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257
corrosion-host-agent/Cargo.lock generated
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