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John T. Myers
29a3b1cacd
* fix(sandbox): add parent-side Landlock availability probe logging Landlock status was only logged from inside the pre_exec child process where the tracing/OCSF pipeline is non-functional after fork. This made Landlock failures completely invisible in sandbox logs. Add a probe_availability() function that issues the raw landlock_create_ruleset syscall to check kernel support, and call it from the parent process before fork in all three spawn paths (entrypoint, SSH PTY, SSH pipe). Uses std::sync::Once to emit exactly once per sandbox lifetime. WIP - addresses logging gap from #803. * test(e2e): add Landlock filesystem enforcement tests Verify Landlock availability logging and enforcement in e2e: - OCSF probe event appears in sandbox logs - Read-only paths block writes, allow reads - Read-write paths allow both - Paths outside policy are denied entirely - User-owned paths outside policy are still blocked (proves Landlock enforces independently of Unix DAC permissions) Requires Linux host with Landlock support (GitHub Actions runners, Docker Desktop linuxkit). Related to #803. * test(e2e): add xfail tests proving #803 privilege ordering bug Two strict xfail tests that demonstrate the root cause of #803: - PathFd::new() runs as uid 998 after drop_privileges, so root-only paths (mode 700) silently fail and Landlock degrades - When ALL paths fail, best_effort silently drops Landlock entirely These tests will pass after the two-phase Landlock fix (open PathFds as root before drop_privileges, restrict_self after). * fix(test): fix Landlock e2e tests based on test run results - Remove log-reading tests: the Landlock probe logs to the supervisor's container stdout, not the in-sandbox file appender at /var/log/openshell*.log* - Replace broken xfail test (checked for child-process log messages that never reach the file appender) with a stat()-based test that verifies /root is actually in the Landlock allowlist - Keep enforcement tests (all passing) and the root-only policy xfail test (correctly proves #803 bug) * fix(test): remove mixed-policy xfail test Landlock doesn't restrict stat(), so the test passed unexpectedly. In the mixed policy case where /root is silently skipped, Landlock still applies (using other paths) and blocks /root even harder (not in allowlist = denied). The observable security degradation only occurs when ALL paths fail, which the existing xfail test already covers. * fix(sandbox): two-phase Landlock to fix privilege ordering (#803) Split Landlock apply into prepare() and enforce(): - prepare() runs as root before drop_privileges: opens PathFds, creates ruleset, adds rules. Root-only paths (mode 700) now succeed instead of silently failing as uid 998. - enforce() runs after drop_privileges: calls restrict_self() which does not require root. This fixes the root cause of #803 where drop_privileges() ran before sandbox::apply(), causing PathFd::new() to fail on root-only paths. In best_effort mode this silently dropped all Landlock restrictions. The fix applies to all three spawn paths: entrypoint (process.rs), SSH PTY (ssh.rs), and SSH pipe exec (ssh.rs). Removes xfail marker from e2e test that now passes. * fix(sandbox): address PR review feedback - enforce() now respects best_effort: if restrict_self() fails and policy is best_effort, log and degrade instead of aborting startup - log_sandbox_readiness distinguishes best_effort (degraded) from hard_requirement (will fail) in OCSF messages