Add basic encrypted login credentials support

cmd/crunchyroll-go/cmd/login.go

@@ -1,15 +1,22 @@
 package cmd
 
 import (
+	"bytes"
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"crypto/sha256"
 	"fmt"
 	"github.com/ByteDream/crunchyroll-go/v2"
 	"github.com/spf13/cobra"
+	"io"
 	"os"
 	"path/filepath"
 )
 
 var (
 	loginPersistentFlag bool
+	loginEncryptFlag    bool
 
 	loginSessionIDFlag bool
 )
@@ -33,6 +40,10 @@ func init() {
 		"persistent",
 		false,
 		"If the given credential should be stored persistent")
+	loginCmd.Flags().BoolVar(&loginEncryptFlag,
+		"encrypt",
+		false,
+		"Encrypt the given credentials (won't do anything if --session-id is given)")
 
 	loginCmd.Flags().BoolVar(&loginSessionIDFlag,
 		"session-id",
@@ -49,20 +60,74 @@ func loginCredentials(user, password string) error {
 		return err
 	}
 
+	if err = os.WriteFile(filepath.Join(os.TempDir(), ".crunchy"), []byte(c.SessionID), 0600); err != nil {
+		return err
+	}
+
 	if loginPersistentFlag {
 		if configDir, err := os.UserConfigDir(); err != nil {
 			return fmt.Errorf("could not save credentials persistent: %w", err)
 		} else {
+			var credentials []byte
+
+			if loginEncryptFlag {
+				var passwd []byte
+
+				for {
+					fmt.Print("Enter password: ")
+					passwd, err = readLineSilent()
+					if err != nil {
+						return err
+					}
+					fmt.Println()
+
+					fmt.Print("Enter password again: ")
+					repasswd, err := readLineSilent()
+					if err != nil {
+						return err
+					}
+					fmt.Println()
+
+					if !bytes.Equal(passwd, repasswd) {
+						fmt.Println("Passwords does not match, try again")
+						continue
+					}
+
+					hashedPassword := sha256.Sum256(passwd)
+					block, err := aes.NewCipher(hashedPassword[:])
+					if err != nil {
+						out.Err("Failed to create block: %w", err)
+						os.Exit(1)
+					}
+					gcm, err := cipher.NewGCM(block)
+					if err != nil {
+						out.Err("Failed to create gcm: %w", err)
+						os.Exit(1)
+					}
+					nonce := make([]byte, gcm.NonceSize())
+					if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
+						out.Err("Failed to fill nonce: %w", err)
+						os.Exit(1)
+					}
+
+					b := gcm.Seal(nonce, nonce, []byte(fmt.Sprintf("%s\n%s", user, password)), nil)
+					credentials = append([]byte("aes:"), b...)
+
+					break
+				}
+			} else {
+				credentials = []byte(fmt.Sprintf("%s\n%s", user, password))
+			}
+
 			os.MkdirAll(filepath.Join(configDir, "crunchyroll-go"), 0755)
-			if err = os.WriteFile(filepath.Join(configDir, "crunchyroll-go", "crunchy"), []byte(fmt.Sprintf("%s\n%s", user, password)), 0600); err != nil {
+			if err = os.WriteFile(filepath.Join(configDir, "crunchyroll-go", "crunchy"), credentials, 0600); err != nil {
 				return err
 			}
-			out.Info("The login information will be stored permanently UNENCRYPTED on your drive (%s)", filepath.Join(configDir, "crunchyroll-go", "crunchy"))
+			if !loginEncryptFlag {
+				out.Info("The login information will be stored permanently UNENCRYPTED on your drive (%s)", filepath.Join(configDir, "crunchyroll-go", "crunchy"))
+			}
 		}
 	}
-	if err = os.WriteFile(filepath.Join(os.TempDir(), ".crunchy"), []byte(c.SessionID), 0600); err != nil {
-		return err
-	}
 
 	if !loginPersistentFlag {
 		out.Info("Due to security reasons, you have to login again on the next reboot")

cmd/crunchyroll-go/cmd/unix.go

@@ -0,0 +1,48 @@
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
+
+package cmd
+
+import (
+	"bufio"
+	"os"
+	"os/exec"
+	"syscall"
+)
+
+// https://github.com/bgentry/speakeasy/blob/master/speakeasy_unix.go
+var stty string
+
+func init() {
+	var err error
+	if stty, err = exec.LookPath("stty"); err != nil {
+		panic(err)
+	}
+}
+
+func readLineSilent() ([]byte, error) {
+	pid, err := setEcho(false)
+	if err != nil {
+		return nil, err
+	}
+	defer setEcho(true)
+
+	syscall.Wait4(pid, nil, 0, nil)
+
+	l, _, err := bufio.NewReader(os.Stdin).ReadLine()
+	return l, err
+}
+
+func setEcho(on bool) (pid int, err error) {
+	fds := []uintptr{os.Stdin.Fd(), os.Stdout.Fd(), os.Stderr.Fd()}
+
+	if on {
+		pid, err = syscall.ForkExec(stty, []string{"stty", "echo"}, &syscall.ProcAttr{Files: fds})
+	} else {
+		pid, err = syscall.ForkExec(stty, []string{"stty", "-echo"}, &syscall.ProcAttr{Files: fds})
+	}
+
+	if err != nil {
+		return 0, err
+	}
+	return
+}

cmd/crunchyroll-go/cmd/utils.go

@@ -1,6 +1,9 @@
 package cmd
 
 import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/sha256"
 	"fmt"
 	"github.com/ByteDream/crunchyroll-go/v2"
 	"github.com/ByteDream/crunchyroll-go/v2/utils"
@@ -167,13 +170,49 @@ func loadCrunchy() {
 			}
 			split := strings.SplitN(string(body), "\n", 2)
 			if len(split) == 1 || split[1] == "" {
-				split[0] = url.QueryEscape(split[0])
-				if crunchy, err = crunchyroll.LoginWithSessionID(split[0], systemLocale(true), client); err != nil {
-					out.StopProgress(err.Error())
-					os.Exit(1)
+				if strings.HasPrefix(split[0], "aes:") {
+					encrypted := body[4:]
+
+					out.StopProgress("Credentials are encrypted")
+					fmt.Print("Enter password to encrypt it: ")
+					passwd, err := readLineSilent()
+					fmt.Println()
+					if err != nil {
+						out.Err("Failed to read password; %w", err)
+						os.Exit(1)
+					}
+					out.SetProgress("Logging in")
+
+					hashedPassword := sha256.Sum256(passwd)
+					block, err := aes.NewCipher(hashedPassword[:])
+					if err != nil {
+						out.Err("Failed to create block: %w", err)
+						os.Exit(1)
+					}
+					gcm, err := cipher.NewGCM(block)
+					if err != nil {
+						out.Err("Failed to create gcm: %w", err)
+						os.Exit(1)
+					}
+					nonce, c := encrypted[:gcm.NonceSize()], encrypted[gcm.NonceSize():]
+
+					b, err := gcm.Open(nil, nonce, c, nil)
+					if err != nil {
+						out.StopProgress("Invalid password")
+						os.Exit(1)
+					}
+					split = strings.SplitN(string(b), "\n", 2)
+				} else {
+					split[0] = url.QueryEscape(split[0])
+					if crunchy, err = crunchyroll.LoginWithSessionID(split[0], systemLocale(true), client); err != nil {
+						out.StopProgress(err.Error())
+						os.Exit(1)
+					}
+					out.Debug("Logged in with session id %s. BLANK THIS LINE OUT IF YOU'RE ASKED TO POST THE DEBUG OUTPUT SOMEWHERE", split[0])
 				}
-				out.Debug("Logged in with session id %s. BLANK THIS LINE OUT IF YOU'RE ASKED TO POST THE DEBUG OUTPUT SOMEWHERE", split[0])
-			} else {
+			}
+
+			if len(split) == 2 {
 				if crunchy, err = crunchyroll.LoginWithCredentials(split[0], split[1], systemLocale(true), client); err != nil {
 					out.StopProgress(err.Error())
 					os.Exit(1)
@@ -183,6 +222,7 @@ func loadCrunchy() {
 				// it seems like that crunchyroll has also a little cooldown if a user logs in too often in a short time
 				os.WriteFile(filepath.Join(os.TempDir(), ".crunchy"), []byte(crunchy.SessionID), 0600)
 			}
+
 			out.StopProgress("Logged in")
 			return
 		}

cmd/crunchyroll-go/cmd/windows.go

@@ -0,0 +1,41 @@
+//go:build windows
+
+package cmd
+
+import (
+	"bufio"
+	"os"
+	"syscall"
+)
+
+// https://github.com/bgentry/speakeasy/blob/master/speakeasy_windows.go
+func readLineSilent() ([]byte, error) {
+	var oldMode uint32
+
+	if err := syscall.GetConsoleMode(syscall.Stdin, &oldMode); err != nil {
+		return nil, err
+	}
+
+	newMode := oldMode &^ 0x0004
+
+	err := setConsoleMode(syscall.Stdin, newMode)
+	defer setConsoleMode(syscall.Stdin, oldMode)
+
+	if err != nil {
+		return nil, err
+	}
+
+	l, _, err := bufio.NewReader(os.Stdin).ReadLine()
+	if err != nil {
+		return nil, err
+	}
+	return l, err
+}
+
+func setConsoleMode(console syscall.Handle, mode uint32) error {
+	dll := syscall.MustLoadDLL("kernel32")
+	proc := dll.MustFindProc("SetConsoleMode")
+	_, _, err := proc.Call(uintptr(console), uintptr(mode))
+
+	return err
+}