feat: plan 16 P2 batch 1 (SEC-13 SSRF, SEC-27 log-escape, SEC-28 path-traversal)

- SEC-13 (M-09): SSRF allowlist on provider-usage-fetch (always block non-http(s) schemes; enforced mode blocks internal/link-local IPs + non-allowlisted hosts, dev keeps loopback mocks); dashboard refuses non-loopback bind in enforced mode. - SEC-27 (X-02): casan-log strips ESC/CSI + CR/LF (terminal-escape + fake-log-line injection) while keeping tab and visible text. - SEC-28 (X-04): new path-guard.sh — realpath resolve + reject symlink/.. escapes outside the allowed root. Verify: SEC-13 6/0, SEC-27 3/0, SEC-28 4/0, adversarial 44/44, run-casan4 0-FAIL. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-06 22:39:18 +09:00
parent 3432ae59e1
commit 8c06a55aed
11 changed files with 273 additions and 5 deletions
@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+set -uo pipefail
+
+# CASAN Plan-16 SEC-13 (M-09) — SSRF allowlist on outbound fetch + dashboard bind.
+#
+# provider-usage-fetch curled an arbitrary URL (SSRF: internal/link-local/file://),
+# and the no-auth dashboard could bind 0.0.0.0. Proves:
+#   * file:// (and other non-http schemes) are ALWAYS rejected,
+#   * dev keeps loopback mocks working (http://127.0.0.1 → unreachable, not blocked),
+#   * enforced mode blocks loopback, metadata IPs, and non-allowlisted hosts,
+#   * the dashboard refuses a non-loopback bind in enforced mode.
+#
+# Deterministic; hermetic; no real network egress.
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
+S="$PROJECT_ROOT/.specify/scripts/bash"
+FETCH="$S/provider-usage-fetch.sh"
+WORK="$(mktemp -d)"
+trap 'rm -rf "$WORK"' EXIT
+OUT="$WORK/o.jsonl"
+
+PASS=0; FAIL=0
+pass() { echo "PASS: $1"; PASS=$((PASS + 1)); }
+fail() { echo "FAIL: $1"; FAIL=$((FAIL + 1)); }
+out_of() { set +e; "$@" 2>&1 >/dev/null; set -e 2>/dev/null || true; }
+
+echo "===== Plan-16 SEC-13: SSRF allowlist + dashboard bind ====="
+
+# 1) file:// always rejected (any mode).
+out_of bash "$FETCH" "file:///etc/passwd" "$OUT" | grep -q "PROVIDER_API_SSRF_BLOCKED\|scheme_not_allowed" \
+  && pass "file:// scheme rejected (all modes)" || fail "file:// not rejected"
+
+# 2) dev + loopback mock: NOT ssrf-blocked (reaches curl → unreachable).
+O="$(out_of bash "$FETCH" "http://127.0.0.1:59991/usage" "$OUT")"
+if echo "$O" | grep -q "PROVIDER_API_SSRF_BLOCKED"; then
+  fail "dev loopback mock wrongly SSRF-blocked (breaks provider telemetry test)"
+else
+  pass "dev loopback mock allowed to reach fetch (backward compatible)"
+fi
+
+# 3) enforced + loopback → blocked.
+out_of env CASAN_SSRF_STRICT=1 bash "$FETCH" "https://127.0.0.1/usage" "$OUT" | grep -q "SSRF_BLOCKED\|internal_ip" \
+  && pass "enforced: loopback blocked" || fail "enforced loopback not blocked"
+
+# 4) enforced + cloud metadata IP → blocked.
+out_of env CASAN_SSRF_STRICT=1 bash "$FETCH" "https://169.254.169.254/latest/meta-data" "$OUT" | grep -q "SSRF_BLOCKED\|internal_ip" \
+  && pass "enforced: link-local metadata IP blocked" || fail "metadata IP not blocked"
+
+# 5) enforced + non-allowlisted host → blocked.
+out_of env CASAN_SSRF_STRICT=1 bash "$FETCH" "https://evil.example.com/usage" "$OUT" | grep -q "SSRF_BLOCKED\|host_not_in_allowlist" \
+  && pass "enforced: non-allowlisted host blocked" || fail "non-allowlisted host not blocked"
+
+# 6) dashboard refuses non-loopback bind in enforced mode.
+out_of env CASAN_DASHBOARD_STRICT=1 CASAN_DASHBOARD_BIND=0.0.0.0 CASAN_DASHBOARD_PORT=0 \
+  python3 "$S/dashboard-server.py" | grep -q "DASHBOARD_BIND_REFUSED" \
+  && pass "enforced: dashboard refuses 0.0.0.0 bind" || fail "dashboard allowed 0.0.0.0 in enforced mode"
+
+echo ""
+echo "===== SEC-13 SUMMARY: PASS=$PASS FAIL=$FAIL ====="
+[[ "$FAIL" -eq 0 ]] || exit 1