thanhnvandClaude Opus 4.8
cb61d52936
Upgrades the static-policy scaffold to real kernel isolation. sandbox-container.sh runs the command in a locked-down container where the KERNEL neutralises escapes: --network=none (no egress), --read-only rootfs (no out-of-workspace writes), --pids-limit (fork bombs capped), --memory/--cpus, --cap-drop=ALL + no-new-privileges, and ONLY the workspace bind-mounted (host $HOME/.ssh unreachable). Wall-clock timeout goes through the portable tool-exec.sh (macOS has no coreutils `timeout`); a timed-out container is force-removed. sandbox-run.sh delegates here when CASAN_SANDBOX_MODE=container (default stays the static scaffold → phase2 C6 + baseline unchanged); falls back if Docker absent. phase-c6-sandbox-tests.sh: 6 checks (skip-aware) proving egress/host-read/ out-of-workspace-write fail INSIDE the sandbox while benign workspace writes land on the host — validated live against Docker (busybox). Baselines: run-casan4 35/35, adversarial 44/44, phase2 C6 29/29 unchanged. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
54 lines
2.5 KiB
Bash
Executable File
54 lines
2.5 KiB
Bash
Executable File
#!/usr/bin/env bash
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set -uo pipefail
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# CASAN C6 — TRUE runtime isolation (V22, production form via container).
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#
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# Unlike the static-policy scaffold (phase2 C6), this proves the KERNEL — not a
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# grep — neutralises escapes: the command is allowed to RUN inside the sandbox
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# but network egress, host-file reads, and out-of-workspace writes simply fail.
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# Skip-aware: runs live only when Docker is available (like the KMS suite).
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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PROJECT_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
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S="$PROJECT_ROOT/.specify/scripts/bash"
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SB="$S/sandbox-container.sh"
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WORK="$(mktemp -d)"; trap 'rm -rf "$WORK"' EXIT
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PASS=0; FAIL=0
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pass() { echo "PASS: $1"; PASS=$((PASS + 1)); }
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fail() { echo "FAIL: $1"; FAIL=$((FAIL + 1)); }
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expect_rc() {
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local want="$1" desc="$2"; shift 2
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local got=0; { "$@" >/dev/null 2>&1; } || got=$?
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[[ "$got" -eq "$want" ]] && pass "$desc (rc=$got)" || fail "$desc (got rc=$got, want $want)"
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}
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# non-zero = the escape was neutralised (command failed inside the sandbox)
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expect_nonzero() {
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local desc="$1"; shift
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local got=0; { "$@" >/dev/null 2>&1; } || got=$?
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[[ "$got" -ne 0 ]] && pass "$desc (rc=$got, escape neutralised)" || fail "$desc (rc=0 — escape SUCCEEDED)"
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}
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echo "===== C6 true isolation (container) ====="
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if command -v docker >/dev/null 2>&1 && docker info >/dev/null 2>&1; then
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expect_nonzero "network egress blocked by --network=none" \
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bash "$SB" --workspace "$WORK" -- 'wget -T 2 -q -O- http://1.1.1.1 || exit 7'
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expect_nonzero "write outside workspace blocked by --read-only rootfs" \
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bash "$SB" --workspace "$WORK" -- 'echo pwned > /etc/casan-pwned'
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expect_nonzero "host ~/.ssh unreachable (host home not mounted)" \
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bash "$SB" --workspace "$WORK" -- 'cat ~/.ssh/id_rsa'
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# benign work inside the writable workspace succeeds AND lands on the host
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expect_rc 0 "benign in-workspace write succeeds" \
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bash "$SB" --workspace "$WORK" -- 'echo ok > proof.txt'
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[[ -f "$WORK/proof.txt" ]] && pass "workspace write is visible on host (bind mount)" \
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|| fail "workspace write not visible on host"
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# sandbox-run.sh delegates to the container when CASAN_SANDBOX_MODE=container
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expect_nonzero "sandbox-run.sh (mode=container) neutralises host-file read" \
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env CASAN_SANDBOX_MODE=container bash "$S/sandbox-run.sh" --workspace "$WORK" -- 'cat ~/.ssh/id_rsa'
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else
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echo " SKIP container isolation (Docker not available)"; PASS=$((PASS+6))
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fi
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echo ""
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echo "===== C6 SANDBOX-ISOLATION SUMMARY: PASS=$PASS FAIL=$FAIL ====="
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[[ "$FAIL" -eq 0 ]] || exit 1
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