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// License: GPLv3 Copyright: 2023, Kovid Goyal, <kovid at kovidgoyal.net>
package ssh
import (
"crypto/hmac"
"crypto/sha1"
"encoding/base32"
"encoding/binary"
"encoding/json"
"fmt"
"os"
"strings"
"time"
"github.com/kovidgoyal/go-shm"
"github.com/kovidgoyal/kitty/tools/cli"
"github.com/kovidgoyal/kitty/tools/tty"
)
var _ = fmt.Print
func fatal(err error) int {
cli.ShowError(err)
return 1
}
func trigger_ask(name string) int {
term, err := tty.OpenControllingTerm()
if err != nil {
return fatal(err)
}
defer term.Close()
_, err = term.WriteString("\x1bP@kitty-ask|" + name + "\x1b\\")
if err != nil {
return fatal(err)
}
return 0
}
func isPasswordPrompt(msg string) bool {
q := strings.ToLower(msg)
if strings.Contains(q, "passphrase") {
return false
}
return strings.Contains(q, "password")
}
func isOTPPrompt(msg string) bool {
q := strings.ToLower(msg)
if strings.Contains(q, "passphrase") {
return false
}
if strings.Contains(q, "verification code") || strings.Contains(q, "one-time password") || strings.Contains(q, "one time password") || strings.Contains(q, "authenticator code") || strings.Contains(q, "authentication code") || strings.Contains(q, "two-factor") || strings.Contains(q, "2fa") || strings.Contains(q, "otp") || strings.Contains(q, "passcode") {
return true
}
return false
}
func generateTOTP(secret string, digits, period int64, t time.Time) (string, error) {
s := strings.ToUpper(strings.TrimSpace(secret))
s = strings.ReplaceAll(s, " ", "")
key, err := base32.StdEncoding.WithPadding(base32.NoPadding).DecodeString(s)
if err != nil {
return "", fmt.Errorf("invalid TOTP secret: %w", err)
}
counter := uint64(t.Unix() / period)
var buf [8]byte
binary.BigEndian.PutUint64(buf[:], counter)
mac := hmac.New(sha1.New, key)
_, _ = mac.Write(buf[:])
sum := mac.Sum(nil)
off := sum[len(sum)-1] & 0x0f
code := (uint32(sum[off])&0x7f)<<24 | (uint32(sum[off+1])&0xff)<<16 | (uint32(sum[off+2])&0xff)<<8 | (uint32(sum[off+3]) & 0xff)
mod := uint32(1)
for range digits {
mod *= 10
}
val := code % mod
fmtstr := fmt.Sprintf("%%0%dd", digits)
return fmt.Sprintf(fmtstr, val), nil
}
func RunSSHAskpass() int {
msg := os.Args[len(os.Args)-1]
prompt := os.Getenv("SSH_ASKPASS_PROMPT")
is_confirm := prompt == "confirm"
q_type := "get_line"
if is_confirm {
q_type = "confirm"
}
is_fingerprint_check := strings.Contains(msg, "(yes/no/[fingerprint])")
// Auto-fill from ssh.conf if configured
if !is_confirm && !is_fingerprint_check {
host := os.Getenv("KITTY_SSH_ASKPASS_HOST")
user := os.Getenv("KITTY_SSH_ASKPASS_USER")
if host != "" {
var overrides []string
_ = json.Unmarshal([]byte(os.Getenv("KITTY_SSH_ASKPASS_OVERRIDES")), &overrides)
if cfg, _, err := load_config(host, user, overrides); err == nil && cfg != nil {
if err = resolve_secrets(cfg, false); err != nil {
return fatal(err)
}
// Password autofill
if isPasswordPrompt(msg) && cfg.Password != "" {
fmt.Println(cfg.Password)
return 0
}
// OTP autofill
if isOTPPrompt(msg) && cfg.Totp_secret != "" {
code, err := generateTOTP(cfg.Totp_secret, int64(cfg.Totp_digits), int64(cfg.Totp_period), time.Now())
if err == nil {
fmt.Println(code)
return 0
}
}
}
}
}
q := map[string]any{
"message": msg,
"type": q_type,
"is_password": !is_fingerprint_check,
}
data, err := json.Marshal(q)
if err != nil {
return fatal(err)
}
data_shm, err := shm.CreateTemp("askpass-*", uint64(len(data)+32))
if err != nil {
return fatal(fmt.Errorf("Failed to create SHM file with error: %w", err))
}
defer data_shm.Close()
defer func() { _ = data_shm.Unlink() }()
data_shm.Slice()[0] = 0
if err = shm.WriteWithSize(data_shm, data, 1); err != nil {
return fatal(fmt.Errorf("Failed to write to SHM file with error: %w", err))
}
if err = data_shm.Flush(); err != nil {
return fatal(fmt.Errorf("Failed to flush SHM file with error: %w", err))
}
trigger_ask(data_shm.Name())
for {
time.Sleep(50 * time.Millisecond)
if data_shm.Slice()[0] == 1 {
break
}
}
data, err = shm.ReadWithSize(data_shm, 1)
if err != nil {
return fatal(fmt.Errorf("Failed to read from SHM file with error: %w", err))
}
response := ""
if is_confirm {
var ok bool
err = json.Unmarshal(data, &ok)
if err != nil {
return fatal(fmt.Errorf("Failed to parse response data: %#v with error: %w", string(data), err))
}
response = "no"
if ok {
response = "yes"
}
} else {
err = json.Unmarshal(data, &response)
if err != nil {
return fatal(fmt.Errorf("Failed to parse response data: %#v with error: %w", string(data), err))
}
if is_fingerprint_check {
response = strings.ToLower(response)
switch response {
case "y":
response = "yes"
case "n":
response = "no"
}
}
}
if response != "" {
fmt.Println(response)
}
return 0
}
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