feat(guard): add essh remote execution and cache removal extension - #2674
feat(guard): add essh remote execution and cache removal extension#2674matthart1983 wants to merge 5 commits into
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essh is an SSH client that fans a single command out across a named host group. Guard's remote extensions covered ssh, scp, and rsync, so an agent running `essh run web -- rm -rf /srv/app` bypassed the guardrails that `ssh web rm -rf /srv/app` would have triggered. Adds one built-in extension, command.remote.essh, with two rules: - command.remote.essh.group-execution (critical) matches `essh run`. Unlike ssh, which opens an interactive session when no command follows the destination, `essh run` has no interactive form -- the subcommand exists only to execute across a group -- so this matches the subcommand rather than counting operands. Severity is above the single-host SSH execution rule because the blast radius is the group membership, which the command string does not reveal. - command.remote.essh.cache-removal (high) matches the `hosts remove`, `keys remove`, and `workspace remove` verbs. Read verbs (connect, why, and the list/show forms) stay outside both rules, as do quoted examples and unrelated arguments. Regenerates the catalog baseline fixture, the pinned permission-catalog digest, the built-in rule count, and the decision-diff source bindings, following the pattern in hashgraph-online#2611. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019VNupD8dZ5eGY4ShCdKAkP
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PR Summary by QodoGuard essh group execution and cache removal commands
AI Description
Diagram
High-Level Assessment
Files changed (8)
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Repository UI (base), Organization UI (inherited) Review profile: CHILL Plan: Pro Plus Run ID: 📒 Files selected for processing (5)
🚧 Files skipped from review as they are similar to previous changes (1)
Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughThe PR adds Changesessh command safety
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The change adds Guard coverage for essh remote execution and destructive removal commands without introducing new execution authority or an actionable merge-blocking risk. It is merge-ready after normal checks and review. Sequence Diagram(s)sequenceDiagram
participant CommandInput
participant LeadingSubcommandMatcher
participant EsshMatchers
participant CommandRules
participant ExtensionCatalog
CommandInput->>LeadingSubcommandMatcher: provide essh operands
LeadingSubcommandMatcher->>EsshMatchers: process options and exit flags
EsshMatchers->>CommandRules: return group-execution or cache-removal rule
CommandRules->>ExtensionCatalog: expose rule and permission metadata
Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 15.38% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 13 functions across 7 files. (2 skipped: 2 unsupported.)
✨ Finishing Touches 💡 1⚔️ Resolve merge conflicts 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 1
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Inline comments:
In `@src/codex_plugin_scanner/guard/runtime/command_remote_extensions.py`:
- Around line 195-204: The _ESSH_CACHE_REMOVAL matchers must recognize global
--theme options, both separated and equals forms, when they appear between
nested subcommands such as hosts and remove. Update the relevant
LeadingSubcommandMatcher configuration or matching flow so global options are
consumed at each subcommand level, while preserving all existing removal command
matches, and add focused coverage for hosts, keys, and workspace removal
commands.
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Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
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📒 Files selected for processing (8)
docs/guard/command-remote-extension-coverage.mdsrc/codex_plugin_scanner/guard/runtime/command_builtin_rules.pysrc/codex_plugin_scanner/guard/runtime/command_remote_extensions.pytests/fixtures/extension-controls/catalog-baseline.v1.jsontests/fixtures/guard-command-corpus/decision-diff-report.jsontests/test_guard_command_extensions.pytests/test_guard_command_permission_catalog.pytests/test_guard_command_remote_extensions.py
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Adding a built-in extension moves the catalog digest, which the shared cloud projection vector pins. Regenerates catalogDigest, canonicalProjectionJson, and expectedExtensionProjectionDigest in contracts/managed-controls/v1/extension-projection-digest-vector.json, and the two matching _GUARD_RELEASE_* constants. Left out of the first commit because contracts/ is release-coordination material and hashgraph-online#2611 did not restage it; included here so the branch runs green. Revert this commit if the vector should be staged by the release process instead. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019VNupD8dZ5eGY4ShCdKAkP
CodeRabbit found a bypass on hashgraph-online#2674: essh's --theme is a clap global option, so it is accepted between subcommand levels. `essh hosts --theme dark remove web-1` parses and removes the host, but evaded command.remote.essh.cache-removal because LeadingSubcommandMatcher stops consuming options at the first operand and then compares the subcommand chain positionally. Verified against the essh binary: `essh hosts --theme dark remove --help` parses, so the bypass was reachable rather than theoretical. Adds an opt-in interleaved_options_with_values field to LeadingSubcommandMatcher that skips declared options, in both separated and equals forms, while walking the subcommand chain. The field defaults to empty and the walk is then equivalent to the previous positional slice, so the redis, rabbitmq, and NATS callers are unchanged; a regression test pins that equivalence. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019VNupD8dZ5eGY4ShCdKAkP
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Thanks — the interleaved global option finding was correct and reachable, not theoretical.
Fixed in c24a21d by adding an opt-in Added coverage for Worth flagging that this pattern is not essh-specific: any multi-level CLI with global options has the same shape, so other extensions may want the new field too. I have left those alone in this PR. |
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Two blockers remain before this can land. First, please address the still-open Qodo correctness finding so top-level essh -h/--help/-V/--version exits stay safe for both run and cache-removal paths, while a literal --help after the remote-command -- delimiter still counts as remote execution. Second, CI confirms the new test is intentional ratchet growth: 16,314 collected cases and 352,915 test-source lines versus the current 16,313 / 352,808 baseline, so please update ci/test-suite-ratchet-baseline.json to those observed values after the correctness-test changes (using the final post-fix inventory if it increases further). The rest of the refreshed checks I inspected are passing.
Addresses the Qodo correctness finding and the ratchet blocker on hashgraph-online#2674. essh inherits clap's -h/--help/-V/--version, which print and exit without running the subcommand. Those invocations matched the new rules, so `essh --help run` and `essh run --help` were raised for review despite executing nothing. Verified against the essh binary that each of these exits before the subcommand runs. Adds an opt-in forbidden_flags_before_delimiter field to LeadingSubcommandMatcher that suppresses a match when a declared exit-only flag appears ahead of the `--` delimiter, in long, short, and clustered short forms. The scan stops at `--`, so a literal `essh run web -- --help` is still remote execution and still matches. The field defaults to empty, leaving the redis, rabbitmq, and NATS callers unchanged, and a regression test pins both directions. Updates ci/test-suite-ratchet-baseline.json to the post-fix inventory, 16315 collected cases and 352951 test source lines, measured with scripts/ci/test_inventory.py. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019VNupD8dZ5eGY4ShCdKAkP
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Both blockers addressed in 9de8e14. Thanks for the merge from main and the precise ratchet numbers. 1. Help and version exits Confirmed against the essh binary: it inherits clap's I went slightly wider than top-level position. Added an opt-in 2. Ratchet baseline Updated to the post-fix inventory rather than the values you observed, since the new correctness tests grew it further, per your note. Measured with
On the three red checks All three traced to the one ratchet failure. Also regenerated the decision-diff source bindings again, since this touches two source files. |
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Latest head addresses the ESSH parser/help-version cases from the prior review. The remaining blocker is branch drift: main advanced and GitHub's update-branch operation now reports merge conflicts, while the maintainer integration cannot write into the fork head directly. Please merge/rebase current main into this branch and regenerate the derived ratchet/catalog/projection fixtures from that refreshed tree rather than preserving the pre-merge digest values. I’ll re-check the refreshed head and CI from the PR.
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Summary
esshis an SSH client whoserunsubcommand fans a single command out across a named host group. Guard's remote extensions currently coverssh,scp, andrsync, so an agent runningsails past the guardrails that
ssh web rm -rf /srv/appwould have triggered. This adds coverage for the execution path and for the three destructiveremoveverbs.I maintain essh, so the rules are written against its actual clap definitions rather than inferred from documentation.
What this adds
One built-in extension,
command.remote.essh, with two rules:command.remote.essh.group-executionessh runcommand.remote.essh.cache-removalessh hosts remove,essh keys remove,essh workspace removeTwo design decisions worth reviewing
group-executionmatches the subcommand, not an operand count. The existing_SSH_REMOTE_EXECUTIONrule usesLeadingOperandCountMatcher(minimum_operands=2)becausessh hostwith no trailing command is an interactive session, which you deliberately exclude.essh runhas no interactive form — the subcommand exists solely to execute a command across a group — so every invocation is remote execution and there is nothing to exclude. It usesLeadingSubcommandMatcheraccordingly.It is rated
critical, one level abovecommand.remote.ssh.execution. The SSH rule covers one command against one destination.essh run web -- ...executes against every host in thewebgroup, and the command string does not reveal how many that is. Happy to drop it tohighfor consistency with the other remote execution rules if you would rather severity tracked the operation than the blast radius.Coverage
Review-required cases include the plain form, the
--themeglobal option in both separate and=forms,.exe/.cmdlauncher names, and all three remove verbs.Safe cases assert no false positives on the read verbs —
connect,why, and thelist/showforms of hosts, keys, and workspaces — plusessh hosts add, quoted documentation strings, andecho-prefixed examples.Regenerated artifacts
Following the pattern in #2611 (Skill Sunset audit extension):
tests/fixtures/extension-controls/catalog-baseline.v1.json— additive only: one extension, two permissions, two rulestest_guard_command_permission_catalog.pytest_guard_command_extensions.py(146 → 148)tests/fixtures/guard-command-corpus/decision-diff-report.jsonviapython tests/guard_command_decision_diff.py --write. feat(guard): add Skill Sunset audit extension #2611 did not need this because it added a new module; this change edits two existing source files, so their source bindings move.The signed projection vector
Adding a built-in extension moves the catalog digest, which
contracts/managed-controls/v1/extension-projection-digest-vector.jsonpins.I initially left it alone: it lives under
contracts/, #2611 did not restage it, anddocs/guard/managed-controls-catalog-mismatch-recovery.mddescribes the digest as release-coordination material tied to Guard Cloud rollout. That left one red test, so it is restaged in a separate second commit (test(guard): restage extension projection vector) coveringcatalogDigest,canonicalProjectionJson,expectedExtensionProjectionDigest, and the two_GUARD_RELEASE_*constants.Split out deliberately: drop that commit if the vector should be staged by your release process instead, and the first commit still stands on its own.
Validation
Broader run:
pytest -k "command or extension or catalog or remote or rule"— 2890 passed, 24 failed. Running the identical selection against a cleanmainin the same environment also fails those 24 (daemon CLI, git metadata, GitHub capability, worktree), so this branch introduces no new failures.Repo-wide
ruff check src testsandruff format --checkreport pre-existing findings on files this PR does not touch, so they are left alone.Summary by CodeRabbit
New Features
esshremote administration tool.Documentation
Tests