update readme

2026-07-07 04:37:29 +01:00
commit 50cbc601d5
69 changed files with 15056 additions and 0 deletions
@@ -0,0 +1,399 @@
+package core
+
+import (
+	"archive/zip"
+	"context"
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"io"
+	"io/fs"
+	"log"
+	"net/http"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"time"
+)
+
+func findGo() string {
+	if p, err := exec.LookPath("go"); err == nil {
+		return p
+	}
+	if goroot := os.Getenv("GOROOT"); goroot != "" {
+		candidate := filepath.Join(goroot, "bin", "go")
+		if fileExists(candidate) {
+			return candidate
+		}
+	}
+
+	goexe := "go"
+	if runtime.GOOS == "windows" {
+		goexe = "go.exe"
+	}
+
+	for _, p := range []string{
+		"/usr/local/go/bin/go",
+		filepath.Join(os.Getenv("HOME"), ".local", "go", "bin", goexe),
+		"/tmp/go/bin/" + goexe,
+		"/usr/lib/go/bin/go",
+		`C:\Go\bin\go.exe`,
+		filepath.Join(os.Getenv("ProgramFiles"), "Go", "bin", "go.exe"),
+		filepath.Join(os.Getenv("LocalAppData"), "go", "bin", goexe),
+		filepath.Join(os.Getenv("HOME"), "sdk", "go", "bin", goexe),
+		filepath.Join(os.TempDir(), "go", "bin", goexe),
+	} {
+		if fileExists(p) {
+			return p
+		}
+	}
+	return goexe
+}
+
+type goFile struct {
+	Filename string `json:"filename"`
+	OS       string `json:"os"`
+	Arch     string `json:"arch"`
+	SHA256   string `json:"sha256"`
+}
+
+type goVersion struct {
+	Version string  `json:"version"`
+	Stable  bool    `json:"stable"`
+	Files   []goFile `json:"files"`
+}
+
+func ensureGo() (string, error) {
+	if p, err := exec.LookPath("go"); err == nil {
+		return p, nil
+	}
+	if goroot := os.Getenv("GOROOT"); goroot != "" {
+		candidate := filepath.Join(goroot, "bin", "go")
+		if fileExists(candidate) {
+			return candidate, nil
+		}
+	}
+
+	if p := findGo(); fileExists(p) {
+		return p, nil
+	}
+
+	log.Printf("[*] Go not found, installing...")
+
+	osName := runtime.GOOS
+	archName := runtime.GOARCH
+	switch archName {
+	case "x86_64":
+		archName = "amd64"
+	case "aarch64":
+		archName = "arm64"
+	}
+
+	ext := ".tar.gz"
+	if osName == "windows" {
+		ext = ".zip"
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	req, err := http.NewRequestWithContext(ctx, "GET", "https://go.dev/VERSION?m=text", nil)
+	if err != nil {
+		return "", fmt.Errorf("create version request: %w", err)
+	}
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return "", fmt.Errorf("check go version: %w", err)
+	}
+	defer resp.Body.Close()
+	versionBytes, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", fmt.Errorf("read go version: %w", err)
+	}
+	version := strings.TrimSpace(strings.Split(string(versionBytes), "\n")[0])
+
+	filename := fmt.Sprintf("%s.%s-%s%s", version, osName, archName, ext)
+	url := fmt.Sprintf("https://go.dev/dl/%s", filename)
+
+	// Fetch checksums from go.dev JSON API
+	checksums, err := fetchGoChecksums()
+	if err != nil {
+		return "", fmt.Errorf("fetch go checksums: %w", err)
+	}
+	expectedHash, ok := checksums[filename]
+	if !ok {
+		return "", fmt.Errorf("no checksum found for %s", filename)
+	}
+
+	log.Printf("[*] downloading %s ...", url)
+
+	tarball, err := os.CreateTemp("", "go-*"+ext)
+	if err != nil {
+		return "", fmt.Errorf("create temp file: %w", err)
+	}
+	defer os.Remove(tarball.Name())
+
+	dlCtx, dlCancel := context.WithTimeout(context.Background(), 120*time.Second)
+	defer dlCancel()
+	dlReq, err := http.NewRequestWithContext(dlCtx, "GET", url, nil)
+	if err != nil {
+		return "", fmt.Errorf("create download request: %w", err)
+	}
+	dlResp, err := http.DefaultClient.Do(dlReq)
+	if err != nil {
+		return "", fmt.Errorf("download go: %w", err)
+	}
+	defer dlResp.Body.Close()
+
+	hash := sha256.New()
+	if _, err := io.Copy(io.MultiWriter(tarball, hash), dlResp.Body); err != nil {
+		return "", fmt.Errorf("write go archive: %w", err)
+	}
+	tarball.Close()
+
+	got := hex.EncodeToString(hash.Sum(nil))
+	if got != expectedHash {
+		return "", fmt.Errorf("checksum mismatch for %s:\n  expected: %s\n  got:      %s", filename, expectedHash, got)
+	}
+	log.Printf("[*] SHA256 verified: %s", expectedHash)
+
+	installDir := installGo(tarball.Name(), osName)
+
+	log.Printf("[+] Go %s installed at %s", version, installDir)
+	return filepath.Join(installDir, "bin", "go"), nil
+}
+
+func fetchGoChecksums() (map[string]string, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+	req, err := http.NewRequestWithContext(ctx, "GET", "https://go.dev/dl/?mode=json&include=all", nil)
+	if err != nil {
+		return nil, fmt.Errorf("create metadata request: %w", err)
+	}
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("get go metadata: %w", err)
+	}
+	defer resp.Body.Close()
+
+	var versions []goVersion
+	if err := json.NewDecoder(resp.Body).Decode(&versions); err != nil {
+		return nil, fmt.Errorf("decode go metadata: %w", err)
+	}
+
+	checksums := make(map[string]string)
+	for _, v := range versions {
+		for _, f := range v.Files {
+			checksums[f.Filename] = f.SHA256
+		}
+	}
+	return checksums, nil
+}
+
+func installGo(archive, osName string) string {
+	homeDir, _ := os.UserHomeDir()
+
+	candidates := []string{
+		"/usr/local/go",
+		filepath.Join(homeDir, ".local", "go"),
+		"/tmp/go",
+	}
+	if osName == "windows" {
+		progFiles := os.Getenv("ProgramFiles")
+		if progFiles == "" {
+			progFiles = `C:\Program Files`
+		}
+		candidates = []string{
+			filepath.Join(progFiles, "Go"),
+			filepath.Join(homeDir, "sdk", "go"),
+			filepath.Join(os.TempDir(), "go"),
+		}
+	}
+
+	for _, dst := range candidates {
+		parent := filepath.Dir(dst)
+		os.RemoveAll(dst)
+		os.MkdirAll(parent, 0755)
+		if extractGoArchive(archive, parent, osName) == nil {
+			if _, err := os.Stat(dst); err == nil {
+				log.Printf("[*] Go extracted to %s", dst)
+				return dst
+			}
+		}
+	}
+
+	// Last resort: always try the root of the temp dir
+	tmpRoot := "/tmp"
+	if osName == "windows" {
+		tmpRoot = os.TempDir()
+	}
+	os.RemoveAll(filepath.Join(tmpRoot, "go"))
+	extractGoArchive(archive, tmpRoot, osName)
+	return filepath.Join(tmpRoot, "go")
+}
+
+func extractGoArchive(archive, dst, osName string) error {
+	if osName == "windows" {
+		return extractZip(archive, dst)
+	}
+	return exec.Command("tar", "-C", dst, "-xzf", archive).Run()
+}
+
+func extractZip(src, dst string) error {
+	r, err := zip.OpenReader(src)
+	if err != nil {
+		return fmt.Errorf("open zip: %w", err)
+	}
+	defer r.Close()
+
+	for _, f := range r.File {
+		target := filepath.Join(dst, f.Name)
+
+		// ZipSlip protection
+		if !strings.HasPrefix(filepath.Clean(target), filepath.Clean(dst)+string(os.PathSeparator)) {
+			continue
+		}
+
+		if f.FileInfo().IsDir() {
+			os.MkdirAll(target, 0755)
+			continue
+		}
+
+		os.MkdirAll(filepath.Dir(target), 0755)
+
+		rc, err := f.Open()
+		if err != nil {
+			return fmt.Errorf("open %s in zip: %w", f.Name, err)
+		}
+
+		out, err := os.OpenFile(target, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, f.Mode())
+		if err != nil {
+			rc.Close()
+			return fmt.Errorf("create %s: %w", target, err)
+		}
+
+		_, err = io.Copy(out, rc)
+		rc.Close()
+		out.Close()
+		if err != nil {
+			return fmt.Errorf("extract %s: %w", f.Name, err)
+		}
+	}
+	return nil
+}
+
+func findGit(dir string) string {
+	gitExe := "git"
+	if runtime.GOOS == "windows" {
+		gitExe = "git.exe"
+	}
+	var found string
+	filepath.WalkDir(dir, func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return nil
+		}
+		if !d.IsDir() && strings.EqualFold(d.Name(), gitExe) {
+			found = path
+			return io.EOF
+		}
+		return nil
+	})
+	return found
+}
+
+// auto-installs MinGit on Windows, tries system package manager on Linux/macOS.
+// Self-contained implant generation is the feature — defer per-platform packaging.
+func installGit() (string, error) {
+	homeDir, _ := os.UserHomeDir()
+	installDir := filepath.Join(homeDir, ".necropolis", "mingit")
+
+	if p := findGit(installDir); p != "" {
+		return p, nil
+	}
+
+	switch runtime.GOOS {
+	case "windows":
+		log.Printf("[*] downloading MinGit...")
+		url := "https://github.com/git-for-windows/git/releases/download/v2.47.0.windows.1/MinGit-2.47.0-64-bit.zip"
+		archive, err := os.CreateTemp("", "mingit-*.zip")
+		if err != nil {
+			return "", fmt.Errorf("create temp: %w", err)
+		}
+		defer os.Remove(archive.Name())
+
+		if err := downloadFile(url, archive); err != nil {
+			return "", fmt.Errorf("download mingit: %w", err)
+		}
+		archive.Close()
+
+		os.RemoveAll(installDir)
+		os.MkdirAll(installDir, 0755)
+		if err := extractZip(archive.Name(), installDir); err != nil {
+			return "", fmt.Errorf("extract mingit: %w", err)
+		}
+
+		if p := findGit(installDir); p != "" {
+			log.Printf("[+] MinGit installed at %s", p)
+			return p, nil
+		}
+		return "", fmt.Errorf("MinGit extracted but git executable not found under %s", installDir)
+
+	case "linux":
+		for _, pm := range [][]string{
+			{"apk", "add", "git"},
+			{"apt-get", "install", "-y", "git"},
+			{"yum", "install", "-y", "git"},
+		} {
+			if _, err := exec.LookPath(pm[0]); err != nil {
+				continue
+			}
+			cmd := exec.Command(pm[0], pm[1:]...)
+			cmd.Stdout = os.Stdout
+			cmd.Stderr = os.Stderr
+			if cmd.Run() == nil {
+				if p, err := exec.LookPath("git"); err == nil {
+					return p, nil
+				}
+			}
+		}
+		return "", fmt.Errorf("could not install git via package manager; install git manually")
+
+	case "darwin":
+		for _, pm := range [][]string{
+			{"xcode-select", "--install"},
+			{"brew", "install", "git"},
+		} {
+			if _, err := exec.LookPath(pm[0]); err != nil {
+				continue
+			}
+			cmd := exec.Command(pm[0], pm[1:]...)
+			cmd.Stdout = os.Stdout
+			cmd.Stderr = os.Stderr
+			if cmd.Run() == nil {
+				if p, err := exec.LookPath("git"); err == nil {
+					return p, nil
+				}
+			}
+		}
+		return "", fmt.Errorf("could not install git; install git manually")
+
+	default:
+		return "", fmt.Errorf("unsupported OS: %s", runtime.GOOS)
+	}
+}
+
+func downloadFile(url string, out *os.File) error {
+	resp, err := http.Get(url)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("bad status: %s", resp.Status)
+	}
+	_, err = io.Copy(out, resp.Body)
+	return err
+}