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package terminal
import (
"bufio"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"sync"
"github.com/sirupsen/logrus"
"golang.org/x/crypto/ssh"
"golang.org/x/crypto/ssh/knownhosts"
"golang.org/x/crypto/ssh/terminal"
"k8s.io/client-go/util/homedir"
)
var (
passPhrase []byte
phraseSync sync.Once
password []byte
passwordSync sync.Once
)
// ReadPassword prompts for a secret and returns value input by user from stdin
// Unlike terminal.ReadPassword(), $(echo $SECRET | podman...) is supported.
// Additionally, all input after `<secret>/n` is queued to podman command.
func ReadPassword(prompt string) (pw []byte, err error) {
fd := int(os.Stdin.Fd())
if terminal.IsTerminal(fd) {
fmt.Fprint(os.Stderr, prompt)
pw, err = terminal.ReadPassword(fd)
fmt.Fprintln(os.Stderr)
return
}
var b [1]byte
for {
n, err := os.Stdin.Read(b[:])
// terminal.ReadPassword discards any '\r', so we do the same
if n > 0 && b[0] != '\r' {
if b[0] == '\n' {
return pw, nil
}
pw = append(pw, b[0])
// limit size, so that a wrong input won't fill up the memory
if len(pw) > 1024 {
err = errors.New("password too long, 1024 byte limit")
}
}
if err != nil {
// terminal.ReadPassword accepts EOF-terminated passwords
// if non-empty, so we do the same
if err == io.EOF && len(pw) > 0 {
err = nil
}
return pw, err
}
}
}
func PublicKey(path string, passphrase []byte) (ssh.Signer, error) {
key, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
signer, err := ssh.ParsePrivateKey(key)
if err != nil {
if _, ok := err.(*ssh.PassphraseMissingError); !ok {
return nil, err
}
if len(passphrase) == 0 {
passphrase = ReadPassphrase()
}
return ssh.ParsePrivateKeyWithPassphrase(key, passphrase)
}
return signer, nil
}
func ReadPassphrase() []byte {
phraseSync.Do(func() {
secret, err := ReadPassword("Key Passphrase: ")
if err != nil {
secret = []byte{}
}
passPhrase = secret
})
return passPhrase
}
func ReadLogin() []byte {
passwordSync.Do(func() {
secret, err := ReadPassword("Login password: ")
if err != nil {
secret = []byte{}
}
password = secret
})
return password
}
func HostKey(host string) ssh.PublicKey {
// parse OpenSSH known_hosts file
// ssh or use ssh-keyscan to get initial key
knownHosts := filepath.Join(homedir.HomeDir(), ".ssh", "known_hosts")
fd, err := os.Open(knownHosts)
if err != nil {
logrus.Error(err)
return nil
}
// support -H parameter for ssh-keyscan
hashhost := knownhosts.HashHostname(host)
scanner := bufio.NewScanner(fd)
for scanner.Scan() {
_, hosts, key, _, _, err := ssh.ParseKnownHosts(scanner.Bytes())
if err != nil {
logrus.Errorf("Failed to parse known_hosts: %s", scanner.Text())
continue
}
for _, h := range hosts {
if h == host || h == hashhost {
return key
}
}
}
return nil
}
|
