feat(encryption): refactor encryption provider scripts, update KMS integration, and enhance key management

2025-05-12 22:43:42 +02:00
parent 05d1624bdd
commit 15b07ea85d
19 changed files with 497 additions and 39 deletions
@@ -0,0 +1,126 @@
+package main
+
+import (
+	"crypto/md5"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"log"
+	"net"
+	"net/http"
+	"os"
+	"os/exec"
+	"strings"
+)
+
+func usage() {
+	fmt.Printf("Usage: %s <keyserver> <image> <device>\n", os.Args[0])
+	fmt.Printf("Example: %s https://keyserver.example.com /path/to/image.img <device>\n", os.Args[0])
+	fmt.Printf("Example: %s https://keyserver.example.com /path/to/image.img /dev/mapper/crypt1\n", os.Args[0])
+	os.Exit(1)
+}
+
+func fileExists(path string) bool {
+	_, err := os.Stat(path)
+	return err == nil
+}
+
+func deviceExists(device string) bool {
+	_, err := os.Stat("/dev/mapper/" + device)
+	return err == nil
+}
+
+func keyserverReachable(url string) bool {
+	resp, err := http.Head(url)
+	if err != nil {
+		return false
+	}
+	resp.Body.Close()
+	return resp.StatusCode < 400
+}
+
+func getUUID() string {
+	// Get CPU model name
+	cpuinfo, _ := ioutil.ReadFile("/proc/cpuinfo")
+	var model string
+	for _, line := range strings.Split(string(cpuinfo), "\n") {
+		if strings.HasPrefix(line, "model name") {
+			model = line
+			break
+		}
+	}
+	// Get eth0 MAC address
+	iface, err := net.InterfaceByName("eth0")
+	mac := ""
+	if err == nil {
+		mac = iface.HardwareAddr.String()
+	}
+	// Get system UUID
+	out, _ := exec.Command("sudo", "dmidecode", "-s", "system-uuid").Output()
+	sysuuid := strings.TrimSpace(string(out))
+	uuid := model + mac + sysuuid
+	return uuid
+}
+
+func main() {
+	log.SetFlags(0)
+	if len(os.Args) != 4 {
+		usage()
+	}
+	keyserver := os.Args[1]
+	image := os.Args[2]
+	device := os.Args[3]
+
+	if !fileExists(image) {
+		log.Printf("open_volume: (%s) Image file not found", device)
+		os.Exit(1)
+	}
+
+	if !keyserverReachable(keyserver) {
+		log.Printf("open_volume: (%s) Key server not reachable, exiting.", device)
+		os.Exit(1)
+	}
+
+	if deviceExists(device) {
+		fmt.Printf("open_volume: (%s) Device already open, exiting.\n", device)
+		os.Exit(1)
+	}
+
+	uuid := getUUID()
+	h := md5.Sum([]byte(uuid))
+	keyid := hex.EncodeToString(h[:])
+
+	log.Printf("open_volume: (%s) Downloading key from key server,", device)
+	keyurl := fmt.Sprintf("%s/%s", keyserver, keyid)
+	resp, err := http.Get(keyurl)
+	if err != nil || resp.StatusCode != 200 {
+		log.Printf("open_volume: (%s) Failed to download key from key server", device)
+		os.Exit(1)
+	}
+	defer resp.Body.Close()
+
+	tmpfile, err := ioutil.TempFile("", "keyfile")
+	if err != nil {
+		log.Printf("open_volume: (%s) Failed to create temp file", device)
+		os.Exit(1)
+	}
+	defer os.Remove(tmpfile.Name())
+	_, err = io.Copy(tmpfile, resp.Body)
+	tmpfile.Close()
+	if err != nil {
+		log.Printf("open_volume: (%s) Failed to save key file", device)
+		os.Exit(1)
+	}
+
+	log.Printf("open_volume:'%s' Key downloaded successfully, opening volume", device)
+	cmd := exec.Command("/usr/sbin/cryptsetup", "luksOpen", image, device, "-d", tmpfile.Name())
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		log.Printf("open_volume: (%s) Failed to open volume: %s", device, string(out))
+		os.Exit(1)
+	}
+
+	log.Printf("open_volume: (%s) Volume opened successfully, removing key file", device)
+	os.Exit(0)
+}