#!/usr/bin/env bash
set -uo pipefail

# CASAN Plan-16 SEC-07 (M-08) — real approval on the remaining approval sites.
#
# control-plane `set` (sensitive), self-improve `apply`, and kill-switch `clear`
# used to accept ANY non-empty approval string. In enforced mode they now require a
# REGISTERED reviewer to cryptographically sign the request (verified by
# approval-verify.sh) — a bare/forged string is denied. Dev mode stays unchanged.
#
# Self-contained: ephemeral reviewer keypair into a temp reviewers dir, using the
# committed reviewers.registry (security-lead → security role; policy_change needs
# security; kill_switch falls back to the default roles).

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
source "$SCRIPT_DIR/../scripts/bash/casan-paths.sh"
PROJECT_ROOT="$CASAN_APP_ROOT"
S="$CASAN_HARNESS_ROOT/scripts/bash"
REG="$CASAN_GOVERNANCE_ROOT/reviewers.registry"
WORK="$(mktemp -d)"; RV="$WORK/reviewers"; mkdir -p "$RV"
trap 'rm -rf "$WORK"' EXIT

# Ephemeral keys: a registered reviewer (security-lead) and an unregistered attacker.
openssl genrsa -out "$WORK/sl.priv" 2048 2>/dev/null
openssl rsa -in "$WORK/sl.priv" -pubout -out "$RV/security-lead.pub.pem" 2>/dev/null
openssl genrsa -out "$WORK/atk.priv" 2048 2>/dev/null

export CASAN_REVIEWERS_FILE="$REG" CASAN_REVIEWERS_DIR="$RV"
export CASAN_CP_STORE_FILE="$WORK/store.json" CASAN_CP_KEY_DIR="$WORK/cpk" CASAN_CP_PUB="$WORK/cp.pub"

PASS=0; FAIL=0
pass() { echo "PASS: $1"; PASS=$((PASS + 1)); }
fail() { echo "FAIL: $1"; FAIL=$((FAIL + 1)); }
rc_of() { set +e; "$@" >/dev/null 2>&1; echo $?; set -e 2>/dev/null || true; }

echo "===== Plan-16 SEC-07: real approval verification ====="

# ---- control-plane set (security-sensitive) ----
CP="$S/control-plane-settings.py"

# Backward compat: dev (non-strict) accepts a plain --approval string.
[[ "$(rc_of python3 "$CP" set security.strict true --actor alice --reason r --approval tok)" -eq 0 ]] \
  && pass "dev mode: plain --approval string still works (backward compatible)" \
  || fail "dev-mode approval broke"

# Enforced: bare string is NOT enough.
[[ "$(rc_of env CASAN_APPROVAL_STRICT=1 python3 "$CP" set security.strict true --actor alice --reason r --approval bogus)" -eq 3 ]] \
  && pass "enforced: bare approval string is DENIED" \
  || fail "enforced mode accepted a bare approval string"

# Enforced: a valid signed approval by the registered reviewer is accepted.
printf 'security.strict' > "$WORK/keyin"
bash "$S/approval-sign.sh" policy_change alice "$WORK/keyin" security-lead "$WORK/sl.priv" "$WORK/ok.sig" >/dev/null 2>&1
[[ "$(rc_of env CASAN_APPROVAL_STRICT=1 CASAN_ACTOR=alice CASAN_APPROVER=security-lead CASAN_APPROVAL_SIG="$WORK/ok.sig" \
      python3 "$CP" set security.strict true --actor alice --reason r --approval x)" -eq 0 ]] \
  && pass "enforced: valid reviewer signature is ACCEPTED" \
  || fail "enforced mode rejected a valid signed approval"

# Enforced: a forged signature (attacker key claiming to be the reviewer) is denied.
bash "$S/approval-sign.sh" policy_change alice "$WORK/keyin" security-lead "$WORK/atk.priv" "$WORK/forged.sig" >/dev/null 2>&1
[[ "$(rc_of env CASAN_APPROVAL_STRICT=1 CASAN_ACTOR=alice CASAN_APPROVER=security-lead CASAN_APPROVAL_SIG="$WORK/forged.sig" \
      python3 "$CP" set security.strict true --actor alice --reason r --approval x)" -eq 3 ]] \
  && pass "enforced: forged signature is DENIED" \
  || fail "enforced mode accepted a forged signature"

# ---- kill-switch clear ----
export CASAN_KILLSWITCH_DIR="$WORK/ks"
bash "$S/kill-switch.sh" engage project ks7 "t" >/dev/null 2>&1
[[ "$(rc_of env CASAN_APPROVAL_STRICT=1 bash "$S/kill-switch.sh" clear project ks7 r)" -eq 3 ]] \
  && pass "enforced: kill-switch clear without approval is DENIED" \
  || fail "enforced kill-switch clear allowed without approval"
[[ "$(rc_of bash "$S/kill-switch.sh" check project ks7)" -eq 2 ]] \
  && pass "kill-switch remained engaged after denied clear" || fail "switch cleared despite denial"

printf 'project/ks7' > "$WORK/ksin"
bash "$S/approval-sign.sh" kill_switch admin "$WORK/ksin" security-lead "$WORK/sl.priv" "$WORK/ks.sig" >/dev/null 2>&1
[[ "$(rc_of env CASAN_APPROVAL_STRICT=1 CASAN_ACTOR=admin CASAN_APPROVER=security-lead CASAN_APPROVAL_SIG="$WORK/ks.sig" \
      bash "$S/kill-switch.sh" clear project ks7 r)" -eq 0 ]] \
  && pass "enforced: kill-switch clear WITH valid approval succeeds" \
  || fail "enforced kill-switch clear rejected a valid approval"

echo ""
echo "===== SEC-07 SUMMARY: PASS=$PASS FAIL=$FAIL ====="
[[ "$FAIL" -eq 0 ]] || exit 1