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Audit pass via Phase C dogfooding (security-auditor @ Agy/Gemini reviewing our own safe_tools.rs) surfaced 5 real bugs. All fixed. ## Gemini findings (5 real bugs) [#1 HIGH] FAIL-OPEN on missing config/hook Before: missing policy-chain.toml → "passing through" warning; missing hook script → "skipped" warning. Misconfig silently disabled enforcement. After: both paths FAIL-CLOSED with clear error surfaced to caller. Tests/dev can opt in to pass-through via KEI_POLICY_CHAIN_OPTIONAL=1. [#2 HIGH] Path traversal in kei_edit/kei_write Before: no validation; attacker could pass file_path=/etc/passwd or $HOME/.ssh/authorized_keys. After: validate_path() rejects '..' segments, system dirs (/etc/, /usr/, /System/, /var/, /root/), and dotfile-secret dirs (~/.ssh/, ~/.aws/, ~/.gnupg/, ~/.config/gcloud/). Override via KEI_ALLOWED_ROOTS for explicit single-root confinement. [#3 HIGH] CLAUDECODE/GROKCODE env bypass Behavior unchanged — this guard is a perf/UX optimization to avoid double-firing hooks when called from inside Claude/Grok (which already ran their own PreToolUse). Documented explicitly as NOT a security boundary: attacker controlling parent env already owns the invocation. Module header gains a DESIGN NOTE making this load-bearing. [#4 MED] std::fs in async context Before: handle_edit/handle_write used std::fs::{read_to_string,write}, which block the tokio worker thread. Pathological paths like /dev/random would freeze a worker indefinitely. After: tokio::fs::{read_to_string,write}.await — async I/O, worker stays responsive. [#5 MED] kill_on_drop only kills immediate child Before: timeout in kei_bash drops the Child handle; tokio's kill_on_drop SIGKILLs only the shell. Grandchildren (e.g., 'sleep 1000 &') orphaned. After: Unix-only: spawn child in its own process group (Command::process_group(0)), and on timeout libc::kill(-pid, SIGKILL) to take down the whole group. New libc dep on Unix. ## Copilot doc fix Doc claimed "kei-mcp exposes 4 built-in tools" without saying spawn_agent lives in tools.rs while kei_bash/edit/write live in safe_tools.rs. Validator agent flagged this as FALSE/MISLEADING. Now the doc spells out the two-file structure + adds a v0.41 hardening summary. ## claude/grok subprocess permissions Cross-CLI audit demo revealed that 'claude -p' and 'grok --print' returned empty when invoked headless with a real audit task — they need explicit permission flags to use Read/Grep tools in non-interactive mode. Added: claude: --permission-mode=bypassPermissions grok: --always-approve agy: --dangerously-skip-permissions Override via KEI_AGENT_PERMISSIVE=0 to keep strict default. Re-verified: claude+grok both echo SMOKE-OK-V41 with the flag. ## Verification cargo test -p kei-mcp --release → 3/3 pass MCP JSON-RPC smoke (all 7): - tools/list shows 4 built-ins ✓ - kei_bash blocks RULE 0.1 push ✓ - kei_bash passes 'echo OK' ✓ - kei_write rejects /etc/passwd ✓ - kei_write rejects ../ traversal ✓ - kei_write rejects ~/.ssh/* ✓ - missing policy-chain → FAIL-CLOSED with clear error ✓ - KEI_POLICY_CHAIN_OPTIONAL=1 → opt-in pass-through ✓
44 lines
1.5 KiB
TOML
44 lines
1.5 KiB
TOML
[package]
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name = "kei-mcp"
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version = "0.1.0"
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edition.workspace = true
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rust-version.workspace = true
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description = "Model Context Protocol (MCP) server — exposes atom registry over stdio JSON-RPC"
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authors.workspace = true
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license.workspace = true
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[[bin]]
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name = "kei-mcp"
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path = "src/main.rs"
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[lib]
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name = "kei_mcp"
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path = "src/lib.rs"
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[dependencies]
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serde = { workspace = true }
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serde_json = { workspace = true }
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# v0.39: io-std added for tokio::io::stdin/stdout used by the MCP stdio
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# transport in main.rs (workspace tokio doesn't enable io-std by default).
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tokio = { workspace = true, features = ["io-std"] }
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# v0.40 (Phase C): toml needed for safe_tools::policy_chain — reads
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# ~/.claude/hooks/_lib/policy-chain.toml to know which hooks to chain.
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toml = "0.8"
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# v0.41 (audit fix #5): killpg via libc on Unix — kill_on_drop only SIGKILLs
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# the immediate child shell, leaving grandchildren orphaned. We set the child
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# in its own process group and killpg() the group on timeout.
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[target.'cfg(unix)'.dependencies]
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libc = "0.2"
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anyhow = { workspace = true }
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kei-atom-discovery = { path = "../kei-atom-discovery" }
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kei-skills = { path = "../kei-skills" }
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[dev-dependencies]
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tempfile = { workspace = true }
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# test-util: needed by tests/tools_call_timeout.rs for tokio::time::advance + Builder::start_paused
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tokio = { workspace = true, features = ["test-util"] }
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[package.metadata.keisei]
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backend = "none"
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description = "MCP server exposing atoms as tools, skills as resources, over stdio JSON-RPC"
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authors = ["Denis Parfionovich <parfionovich@keilab.io>"]
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