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 +1,11 @@
+BINARY=open_volume
+
+.PHONY: all build clean
+
+all: build
+
+build:
+	go build -o $(BINARY) main.go
+
+clean:
+	rm -f $(BINARY)
@@ -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)
+}
@@ -0,0 +1,11 @@
+BINARY=read_system_id
+
+.PHONY: all build clean
+
+all: build
+
+build:
+	go build -o $(BINARY) main.go
+
+clean:
+	rm -f $(BINARY)
@@ -0,0 +1,79 @@
+package main
+
+import (
+	"bufio"
+	"crypto/md5"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"regexp"
+	"strings"
+)
+
+func getModelName() string {
+	file, err := os.Open("/proc/cpuinfo")
+	if err != nil {
+		return ""
+	}
+	defer file.Close()
+	scanner := bufio.NewScanner(file)
+	re := regexp.MustCompile(`^model name\s*:\s*(.*)$`)
+	for scanner.Scan() {
+		line := scanner.Text()
+		if matches := re.FindStringSubmatch(line); matches != nil {
+			return matches[1]
+		}
+	}
+	return ""
+}
+
+func getEth0Mac() string {
+	out, err := exec.Command("ip", "link").Output()
+	if err != nil {
+		return ""
+	}
+	re := regexp.MustCompile(`^(\d+):\s+([a-zA-Z0-9]+):.*<.*>\s+link/ether\s+([0-9a-f:]{17})`)
+	matches := re.FindAllStringSubmatch(string(out), -1)
+	fmt.Println("Matches:", matches)
+	if len(matches) == 0 {
+		return ""
+	}
+	first_device := matches[0][2]
+	fmt.Println("First device:", first_device)
+	// Get the MAC address of the first device
+	out, err = exec.Command("ip", "link", "show", first_device).Output()
+	if err != nil {
+		return ""
+	}
+	re = regexp.MustCompile(`ether\s+([0-9a-f:]{17})`)
+	match := re.FindStringSubmatch(string(out))
+	if match != nil {
+		return match[1]
+	}
+	return ""
+}
+
+func getSystemUUID() string {
+	out, err := exec.Command("sudo", "dmidecode", "-s", "system-uuid").Output()
+	if err != nil {
+		return ""
+	}
+	return strings.TrimSpace(string(out))
+}
+
+func md5sum(s string) string {
+	h := md5.New()
+	io.WriteString(h, s)
+	return hex.EncodeToString(h.Sum(nil))
+}
+
+func main() {
+	uuid := getModelName()
+	uuid += getEth0Mac()
+	uuid += getSystemUUID()
+	fmt.Println(uuid)
+	hash := md5sum(uuid)
+	fmt.Println(hash)
+}
@@ -0,0 +1,6 @@
+#!/bin/bash
+uuid=$(cat /proc/cpuinfo | grep 'model name' | head -1)
+uuid+=$(ip link show wlo1 | grep ether | awk '{print $2}')
+uuid+=$(sudo dmidecode -s system-uuid)
+echo "UUID: $uuid"
+echo -n "$uuid" | md5sum | awk '{print $1}'
@@ -0,0 +1,11 @@
+BINARY=start_encryption_provider
+
+.PHONY: all build clean
+
+all: build
+
+build:
+	go build -o $(BINARY) main.go
+
+clean:
+	rm -f $(BINARY)
@@ -0,0 +1,130 @@
+package main
+
+import (
+	"crypto/md5"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"net/http"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+)
+
+type Credentials struct {
+	AccessKey string `json:"access_key"`
+	SecretKey string `json:"secret_key"`
+	KeyArn    string `json:"key_arn"`
+	Region    string `json:"region"`
+}
+
+func main() {
+	if len(os.Args) < 2 {
+		fmt.Printf("Usage: %s <keyserver> [socket]\n", os.Args[0])
+		fmt.Printf("Example: %s https://keyserver.example.com\n", os.Args[0])
+		fmt.Printf("Example: %s https://keyserver.example.com /var/run/kmsplugin/socket.sock\n", os.Args[0])
+		os.Exit(1)
+	}
+
+	keyserver := os.Args[1]
+	socket := "/var/run/kmsplugin/socket.sock"
+	if len(os.Args) > 2 {
+		socket = os.Args[2]
+	}
+
+	// Check if keyserver is reachable
+	resp, err := http.Head(keyserver)
+	if err != nil || resp.StatusCode >= 400 {
+		log.Println("Key server not reachable, exiting.")
+		os.Exit(1)
+	}
+
+	// Generate UUID
+	uuid := getCPUModel() + getEth0MAC() + getSystemUUID()
+	keyID := md5sum(uuid)
+
+	log.Println("Downloading key from key server")
+	keyURL := fmt.Sprintf("%s/%s-encryption-service-credentials.json", keyserver, keyID)
+	resp, err = http.Get(keyURL)
+	if err != nil || resp.StatusCode != 200 {
+		log.Println("Failed to download key from key server")
+		os.Exit(1)
+	}
+	defer resp.Body.Close()
+	body, err := io.ReadAll(resp.Body) // Changed from ioutil.ReadAll
+	if err != nil {
+		log.Println("Failed to read key file")
+		os.Exit(1)
+	}
+
+	var creds Credentials
+	if err := json.Unmarshal(body, &creds); err != nil {
+		log.Println("Failed to extract credentials from key file")
+		os.Exit(1)
+	}
+
+	os.Setenv("AWS_ACCESS_KEY_ID", creds.AccessKey)
+	os.Setenv("AWS_SECRET_ACCESS_KEY", creds.SecretKey)
+
+	// Prepare socket dir
+	socketDir := filepath.Dir(socket)
+	os.MkdirAll(socketDir, 0700)
+	os.Chmod(socketDir, 0700)
+
+	if _, err := os.Stat("/usr/local/bin/aws-encryption-provider"); os.IsNotExist(err) {
+		log.Println("Encryption provider not found, exiting.")
+		os.Exit(1)
+	}
+
+	cmd := exec.Command("/usr/local/bin/aws-encryption-provider",
+		"--key="+creds.KeyArn,
+		"--region="+creds.Region,
+		"--listen="+socket,
+	)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	if err := cmd.Run(); err != nil {
+		log.Println("Failed to start encryption provider")
+		os.Exit(1)
+	}
+	os.Exit(0)
+}
+
+func getCPUModel() string {
+	data, err := os.ReadFile("/proc/cpuinfo") // Changed from ioutil.ReadFile
+	if err != nil {
+		return ""
+	}
+	for _, line := range strings.Split(string(data), "\n") {
+		if strings.HasPrefix(line, "model name") {
+			return line
+		}
+	}
+	return ""
+}
+
+func getEth0MAC() string {
+	iface, err := net.InterfaceByName("eth0")
+	if err != nil {
+		return ""
+	}
+	return iface.HardwareAddr.String()
+}
+
+func getSystemUUID() string {
+	out, err := exec.Command("sudo", "dmidecode", "-s", "system-uuid").Output()
+	if err != nil {
+		return ""
+	}
+	return strings.TrimSpace(string(out))
+}
+
+func md5sum(s string) string {
+	h := md5.New()
+	io.WriteString(h, s)
+	return hex.EncodeToString(h.Sum(nil))
+}