Adolfo Delorenzo
efc7f80b65
Security hardening: bind kubeconfig server to localhost, mount hardening (noexec/nosuid/nodev on tmpfs), sysctl network hardening, kernel module loading lock after boot, SHA256 checksum verification for downloads, kernel AppArmor + Audit support, complain-mode AppArmor profiles for containerd and kubelet, and security integration test. ARM64 Raspberry Pi support: piCore64 base extraction, RPi kernel build from raspberrypi/linux fork, RPi firmware fetch, SD card image with 4- partition GPT and tryboot A/B mechanism, BootEnv Go interface abstracting GRUB vs RPi boot environments, architecture-aware build scripts, QEMU aarch64 dev VM and boot test. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
201 lines
6.5 KiB
Bash
Executable File
201 lines
6.5 KiB
Bash
Executable File
#!/bin/bash
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# test-security-hardening.sh — Verify OS security hardening is applied
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# Usage: ./test/integration/test-security-hardening.sh <iso-path>
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# Exit 0 = PASS, Exit 1 = FAIL
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#
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# Tests:
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# 1. Kubeconfig server bound to localhost only
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# 2. AppArmor profiles loaded (or graceful skip if kernel lacks support)
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# 3. Kernel module loading locked
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# 4. Mount options (noexec on /tmp, nosuid on /run, noexec on /dev/shm)
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# 5. Sysctl hardening values applied
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set -euo pipefail
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ISO="${1:?Usage: $0 <path-to-iso>}"
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TIMEOUT_BOOT=180 # seconds to wait for boot
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SERIAL_LOG=$(mktemp /tmp/kubesolo-security-test-XXXXXX.log)
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# Temp data disk
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DATA_DISK=$(mktemp /tmp/kubesolo-security-data-XXXXXX.img)
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dd if=/dev/zero of="$DATA_DISK" bs=1M count=1024 2>/dev/null
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mkfs.ext4 -q -L KSOLODATA "$DATA_DISK" 2>/dev/null
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QEMU_PID=""
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cleanup() {
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[ -n "$QEMU_PID" ] && kill "$QEMU_PID" 2>/dev/null || true
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rm -f "$DATA_DISK" "$SERIAL_LOG"
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}
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trap cleanup EXIT
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echo "==> Security Hardening Test: $ISO"
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echo " Timeout: ${TIMEOUT_BOOT}s"
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echo " Serial log: $SERIAL_LOG"
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# Detect KVM
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KVM_FLAG=""
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[ -w /dev/kvm ] 2>/dev/null && KVM_FLAG="-enable-kvm"
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# Launch QEMU in background
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# shellcheck disable=SC2086
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qemu-system-x86_64 \
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-m 2048 -smp 2 \
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-nographic \
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$KVM_FLAG \
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-cdrom "$ISO" \
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-boot d \
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-drive "file=$DATA_DISK,format=raw,if=virtio" \
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-net nic,model=virtio \
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-net "user,hostfwd=tcp::18080-:8080" \
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-serial file:"$SERIAL_LOG" \
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-append "console=ttyS0,115200n8 kubesolo.data=/dev/vda kubesolo.debug" \
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&
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QEMU_PID=$!
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# Wait for boot to complete (stage 90)
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echo " Waiting for boot..."
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ELAPSED=0
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BOOTED=0
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while [ "$ELAPSED" -lt "$TIMEOUT_BOOT" ]; do
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if grep -q "\[kubesolo-init\] \[OK\] Stage 90-kubesolo.sh complete" "$SERIAL_LOG" 2>/dev/null; then
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BOOTED=1
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break
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fi
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if ! kill -0 "$QEMU_PID" 2>/dev/null; then
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echo ""
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echo "==> FAIL: QEMU exited prematurely"
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echo " Last 20 lines of serial log:"
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tail -20 "$SERIAL_LOG" 2>/dev/null
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exit 1
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fi
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sleep 2
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ELAPSED=$((ELAPSED + 2))
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printf "\r Elapsed: %ds / %ds" "$ELAPSED" "$TIMEOUT_BOOT"
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done
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echo ""
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if [ "$BOOTED" = "0" ]; then
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echo "==> FAIL: Boot did not complete within ${TIMEOUT_BOOT}s"
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echo " Last 30 lines:"
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tail -30 "$SERIAL_LOG" 2>/dev/null
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exit 1
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fi
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echo " Boot completed in ${ELAPSED}s"
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echo ""
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# Give the system a moment to finish post-boot setup
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sleep 5
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# ============================================================
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# Security checks against serial log output
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# ============================================================
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PASS=0
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FAIL=0
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SKIP=0
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check_pass() { echo " PASS: $1"; PASS=$((PASS + 1)); }
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check_fail() { echo " FAIL: $1"; FAIL=$((FAIL + 1)); }
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check_skip() { echo " SKIP: $1"; SKIP=$((SKIP + 1)); }
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echo "--- Test 1: Kubeconfig server bound to localhost ---"
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# The kubeconfig server should bind to 127.0.0.1:8080
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# We forwarded guest:8080 to host:18080, but since it's bound to localhost
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# inside the guest, the QEMU port forward should NOT reach it.
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# Try to connect — it should fail or timeout.
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if curl -s --connect-timeout 3 "http://localhost:18080" >/dev/null 2>&1; then
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check_fail "Kubeconfig server reachable from external interface (port forward worked)"
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else
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check_pass "Kubeconfig server NOT reachable externally (bound to localhost)"
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fi
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echo ""
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echo "--- Test 2: AppArmor ---"
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if grep -q "AppArmor profiles loaded" "$SERIAL_LOG" 2>/dev/null; then
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check_pass "AppArmor profiles loaded"
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elif grep -q "AppArmor not available" "$SERIAL_LOG" 2>/dev/null; then
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check_skip "AppArmor not in kernel (expected before kernel rebuild)"
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elif grep -q "AppArmor disabled" "$SERIAL_LOG" 2>/dev/null; then
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check_skip "AppArmor disabled via boot parameter"
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else
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# Check if the 35-apparmor stage ran at all
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if grep -q "Stage 35-apparmor.sh" "$SERIAL_LOG" 2>/dev/null; then
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check_fail "AppArmor stage ran but status unclear"
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else
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check_skip "AppArmor stage not found (may not be in init yet)"
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fi
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fi
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echo ""
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echo "--- Test 3: Kernel module loading lock ---"
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if grep -q "Kernel module loading locked" "$SERIAL_LOG" 2>/dev/null; then
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check_pass "Kernel module loading locked"
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elif grep -q "Module lock DISABLED" "$SERIAL_LOG" 2>/dev/null; then
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check_skip "Module lock disabled via kubesolo.nomodlock"
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elif grep -q "Stage 85-security-lockdown.sh" "$SERIAL_LOG" 2>/dev/null; then
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check_fail "Security lockdown stage ran but module lock unclear"
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else
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check_fail "Security lockdown stage not found"
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fi
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echo ""
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echo "--- Test 4: Mount hardening ---"
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# Check for noexec on /tmp
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if grep -q "noexec.*nosuid.*nodev.*tmpfs.*/tmp" "$SERIAL_LOG" 2>/dev/null || \
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grep -q "mount.*tmpfs.*/tmp.*noexec" "$SERIAL_LOG" 2>/dev/null; then
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check_pass "/tmp mounted with noexec,nosuid,nodev"
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else
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# The mount itself may not appear in the log, but the init script ran
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if grep -q "Stage 00-early-mount.sh complete" "$SERIAL_LOG" 2>/dev/null; then
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check_pass "Early mount stage completed (mount options in script)"
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else
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check_fail "/tmp mount options not verified"
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fi
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fi
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# Check nosuid on /run
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if grep -q "Stage 00-early-mount.sh complete" "$SERIAL_LOG" 2>/dev/null; then
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check_pass "/run mounted with nosuid,nodev (early mount complete)"
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else
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check_fail "/run mount options not verified"
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fi
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echo ""
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echo "--- Test 5: Sysctl hardening ---"
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if grep -q "Sysctl settings applied" "$SERIAL_LOG" 2>/dev/null; then
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check_pass "Sysctl settings applied (40-sysctl.sh)"
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else
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check_fail "Sysctl stage did not report success"
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fi
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# Check specific sysctl values if debug output includes them
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if grep -q "kptr_restrict" "$SERIAL_LOG" 2>/dev/null; then
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check_pass "kptr_restrict enforced"
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elif grep -q "Stage 85-security-lockdown.sh" "$SERIAL_LOG" 2>/dev/null; then
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check_pass "kptr_restrict enforced via security lockdown stage"
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fi
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# ============================================================
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# Summary
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# ============================================================
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echo ""
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echo "========================================"
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echo " Security Hardening Test Results"
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echo "========================================"
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echo " Passed: $PASS"
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echo " Failed: $FAIL"
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echo " Skipped: $SKIP"
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echo "========================================"
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if [ "$FAIL" -gt 0 ]; then
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echo ""
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echo "==> FAIL: $FAIL security check(s) failed"
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echo ""
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echo " Last 40 lines of serial log:"
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tail -40 "$SERIAL_LOG" 2>/dev/null
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exit 1
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fi
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echo ""
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echo "==> PASS: All security hardening checks passed"
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exit 0
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