问题
Situation:
I want to get a password entry from the stdin console - without echoing what the user types. Is there something comparable to getpasswd functionality in Go?
What I tried:
I tried using syscall.Read, but it echoes what is typed.
回答1:
you can do this by execing stty -echo to turn off echo and then stty echo after reading in the password to turn it back on
回答2:
The following is one of best ways to get it done.
First get terminal package by go get golang.org/x/crypto/ssh
package main
import (
"bufio"
"fmt"
"os"
"strings"
"syscall"
"golang.org/x/crypto/ssh/terminal"
)
func main() {
username, password := credentials()
fmt.Printf("Username: %s, Password: %s\n", username, password)
}
func credentials() (string, string) {
reader := bufio.NewReader(os.Stdin)
fmt.Print("Enter Username: ")
username, _ := reader.ReadString('\n')
fmt.Print("Enter Password: ")
bytePassword, err := terminal.ReadPassword(int(syscall.Stdin))
if err == nil {
fmt.Println("\nPassword typed: " + string(bytePassword))
}
password := string(bytePassword)
return strings.TrimSpace(username), strings.TrimSpace(password)
}
http://play.golang.org/p/l-9IP1mrhA
回答3:
Just saw a mail in #go-nuts maillist. There is someone who wrote quite a simple go package to be used. You can find it here: https://github.com/howeyc/gopass
It something like that:
package main
import "fmt"
import "github.com/howeyc/gopass"
func main() {
fmt.Printf("Password: ")
pass := gopass.GetPasswd()
// Do something with pass
}
回答4:
I had a similar usecase and the following code snippet works well for me. Feel free to try this if you are still stuck here.
import (
"fmt"
"golang.org/x/crypto/ssh/terminal"
)
func main() {
fmt.Printf("Now, please type in the password (mandatory): ")
password, _ := terminal.ReadPassword(0)
fmt.Printf("Password is : %s", password)
}
Of course, you need to install terminal package using go get beforehand.
回答5:
Here is a solution that I developed using Go1.6.2 that you might find useful.
It only uses the following standard packages: bufio, fmt, os, strings and syscall. More specifically, it uses syscall.ForkExec() and syscall.Wait4() to invoke stty to disable/enable terminal echo.
I have tested it on Linux and BSD (Mac). It will not work on windows.
// getPassword - Prompt for password. Use stty to disable echoing.
import ( "bufio"; "fmt"; "os"; "strings"; "syscall" )
func getPassword(prompt string) string {
fmt.Print(prompt)
// Common settings and variables for both stty calls.
attrs := syscall.ProcAttr{
Dir: "",
Env: []string{},
Files: []uintptr{os.Stdin.Fd(), os.Stdout.Fd(), os.Stderr.Fd()},
Sys: nil}
var ws syscall.WaitStatus
// Disable echoing.
pid, err := syscall.ForkExec(
"/bin/stty",
[]string{"stty", "-echo"},
&attrs)
if err != nil {
panic(err)
}
// Wait for the stty process to complete.
_, err = syscall.Wait4(pid, &ws, 0, nil)
if err != nil {
panic(err)
}
// Echo is disabled, now grab the data.
reader := bufio.NewReader(os.Stdin)
text, err := reader.ReadString('\n')
if err != nil {
panic(err)
}
// Re-enable echo.
pid, err = syscall.ForkExec(
"/bin/stty",
[]string{"stty", "echo"},
&attrs)
if err != nil {
panic(err)
}
// Wait for the stty process to complete.
_, err = syscall.Wait4(pid, &ws, 0, nil)
if err != nil {
panic(err)
}
return strings.TrimSpace(text)
}
回答6:
Here is a version specific to Linux:
func terminalEcho(show bool) {
// Enable or disable echoing terminal input. This is useful specifically for
// when users enter passwords.
// calling terminalEcho(true) turns on echoing (normal mode)
// calling terminalEcho(false) hides terminal input.
var termios = &syscall.Termios{}
var fd = os.Stdout.Fd()
if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd,
syscall.TCGETS, uintptr(unsafe.Pointer(termios))); err != 0 {
return
}
if show {
termios.Lflag |= syscall.ECHO
} else {
termios.Lflag &^= syscall.ECHO
}
if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd,
uintptr(syscall.TCSETS),
uintptr(unsafe.Pointer(termios))); err != 0 {
return
}
}
So to use it:
fmt.Print("password: ")
terminalEcho(false)
var pw string
fmt.Scanln(&pw)
terminalEcho(true)
fmt.Println("")
It's the TCGETS syscall that is linux specific. There are different syscall values for OSX and Windows.
回答7:
Required launching stty via Go ForkExec() function:
package main
import (
os "os"
bufio "bufio"
fmt "fmt"
str "strings"
)
func main() {
fmt.Println();
if passwd, err := Getpasswd("Enter password: "); err == nil {
fmt.Printf("\n\nPassword: '%s'\n",passwd)
}
}
func Getpasswd(prompt string) (passwd string, err os.Error) {
fmt.Print(prompt);
const stty_arg0 = "/bin/stty";
stty_argv_e_off := []string{"stty","-echo"};
stty_argv_e_on := []string{"stty","echo"};
const exec_cwdir = "";
fd := []*os.File{os.Stdin,os.Stdout,os.Stderr};
pid, err := os.ForkExec(stty_arg0,stty_argv_e_off,nil,exec_cwdir,fd);
if err != nil {
return passwd, os.NewError(fmt.Sprintf("Failed turning off console echo for password entry:\n\t%s",err))
}
rd := bufio.NewReader(os.Stdin);
os.Wait(pid,0);
line, err := rd.ReadString('\n');
if err == nil {
passwd = str.TrimSpace(line)
} else {
err = os.NewError(fmt.Sprintf("Failed during password entry: %s",err))
}
pid, e := os.ForkExec(stty_arg0,stty_argv_e_on,nil,exec_cwdir,fd);
if e == nil {
os.Wait(pid,0)
} else if err == nil {
err = os.NewError(fmt.Sprintf("Failed turning on console echo post password entry:\n\t%s",e))
}
return passwd, err
}
回答8:
You could also use PasswordPrompt function of https://github.com/peterh/liner package.
回答9:
You can get the behavior you want with the Read method from the os.File object (or the os.Stdin variable). The following sample program will read a line of text (terminated with by pressing the return key) but won't echo it until the fmt.Printf call.
package main
import "fmt"
import "os"
func main() {
var input []byte = make( []byte, 100 );
os.Stdin.Read( input );
fmt.Printf( "%s", input );
}
If you want more advanced behavior, you're probably going to have to use the Go C-wrapper utilities and create some wrappers for low-level api calls.
来源：https://stackoverflow.com/questions/2137357/getpasswd-functionality-in-go