#!/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 "${BASH_SOURCE[0]}")" && pwd)"
source "$SCRIPT_DIR/../scripts/bash/casan-paths.sh"
PROJECT_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
S="$CASAN_HARNESS_ROOT/scripts/bash"
FETCH="$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