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package main
import (
"bufio"
"fmt"
"os"
"strings"
"github.com/containers/image/docker"
"github.com/containers/image/pkg/docker/config"
"github.com/containers/image/types"
"github.com/containers/libpod/cmd/podman/cliconfig"
"github.com/containers/libpod/libpod/common"
"github.com/pkg/errors"
"github.com/spf13/cobra"
"golang.org/x/crypto/ssh/terminal"
)
var (
loginCommand cliconfig.LoginValues
loginDescription = "Login to a container registry on a specified server."
_loginCommand = &cobra.Command{
Use: "login",
Short: "Login to a container registry",
Long: loginDescription,
RunE: func(cmd *cobra.Command, args []string) error {
loginCommand.InputArgs = args
loginCommand.GlobalFlags = MainGlobalOpts
return loginCmd(&loginCommand)
},
Example: "REGISTRY",
}
)
func init() {
loginCommand.Command = _loginCommand
loginCommand.SetUsageTemplate(UsageTemplate())
flags := loginCommand.Flags()
flags.StringVar(&loginCommand.Authfile, "authfile", "", "Path of the authentication file. Default is ${XDG_RUNTIME_DIR}/containers/auth.json. Use REGISTRY_AUTH_FILE environment variable to override")
flags.StringVar(&loginCommand.CertDir, "cert-dir", "", "Pathname of a directory containing TLS certificates and keys used to connect to the registry")
flags.BoolVar(&loginCommand.GetLogin, "get-login", true, "Return the current login user for the registry")
flags.StringVarP(&loginCommand.Password, "password", "p", "", "Password for registry")
flags.BoolVar(&loginCommand.TlsVerify, "tls-verify", true, "Require HTTPS and verify certificates when contacting registries (default: true)")
flags.StringVarP(&loginCommand.Username, "username", "u", "", "Username for registry")
flags.BoolVar(&loginCommand.StdinPassword, "password-stdin", false, "Take the password from stdin")
}
// loginCmd uses the authentication package to store a user's authenticated credentials
// in an auth.json file for future use
func loginCmd(c *cliconfig.LoginValues) error {
args := c.InputArgs
if len(args) > 1 {
return errors.Errorf("too many arguments, login takes only 1 argument")
}
if len(args) == 0 {
return errors.Errorf("please specify a registry to login to")
}
server := registryFromFullName(scrubServer(args[0]))
authfile := getAuthFile(c.Authfile)
sc := common.GetSystemContext("", authfile, false)
if c.Flag("tls-verify").Changed {
sc.DockerInsecureSkipTLSVerify = types.NewOptionalBool(!c.TlsVerify)
}
if c.CertDir != "" {
sc.DockerCertPath = c.CertDir
}
if c.Flag("get-login").Changed {
user, err := config.GetUserLoggedIn(sc, server)
if err != nil {
return errors.Wrapf(err, "unable to check for login user")
}
if user == "" {
return errors.Errorf("not logged into %s", server)
}
fmt.Printf("%s\n", user)
return nil
}
// username of user logged in to server (if one exists)
userFromAuthFile, passFromAuthFile, err := config.GetAuthentication(sc, server)
if err != nil {
return errors.Wrapf(err, "error reading auth file")
}
ctx := getContext()
password := c.Password
if c.Flag("password-stdin").Changed {
var stdinPasswordStrBuilder strings.Builder
if c.Password != "" {
return errors.Errorf("Can't specify both --password-stdin and --password")
}
if c.Username == "" {
return errors.Errorf("Must provide --username with --password-stdin")
}
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
fmt.Fprint(&stdinPasswordStrBuilder, scanner.Text())
}
password = stdinPasswordStrBuilder.String()
}
// If no username and no password is specified, try to use existing ones.
if c.Username == "" && password == "" && userFromAuthFile != "" && passFromAuthFile != "" {
fmt.Println("Authenticating with existing credentials...")
if err := docker.CheckAuth(ctx, sc, userFromAuthFile, passFromAuthFile, server); err == nil {
fmt.Println("Existing credentials are valid. Already logged in to", server)
return nil
}
fmt.Println("Existing credentials are invalid, please enter valid username and password")
}
username, password, err := getUserAndPass(c.Username, password, userFromAuthFile)
if err != nil {
return errors.Wrapf(err, "error getting username and password")
}
if err = docker.CheckAuth(ctx, sc, username, password, server); err == nil {
// Write the new credentials to the authfile
if err = config.SetAuthentication(sc, server, username, password); err != nil {
return err
}
}
switch err {
case nil:
fmt.Println("Login Succeeded!")
return nil
case docker.ErrUnauthorizedForCredentials:
return errors.Errorf("error logging into %q: invalid username/password", server)
default:
return errors.Wrapf(err, "error authenticating creds for %q", server)
}
}
// getUserAndPass gets the username and password from STDIN if not given
// using the -u and -p flags. If the username prompt is left empty, the
// displayed userFromAuthFile will be used instead.
func getUserAndPass(username, password, userFromAuthFile string) (string, string, error) {
var err error
reader := bufio.NewReader(os.Stdin)
if username == "" {
if userFromAuthFile != "" {
fmt.Printf("Username (%s): ", userFromAuthFile)
} else {
fmt.Print("Username: ")
}
username, err = reader.ReadString('\n')
if err != nil {
return "", "", errors.Wrapf(err, "error reading username")
}
// If the user just hit enter, use the displayed user from the
// the authentication file. This allows to do a lazy
// `$ podman login -p $NEW_PASSWORD` without specifying the
// user.
if strings.TrimSpace(username) == "" {
username = userFromAuthFile
}
}
if password == "" {
fmt.Print("Password: ")
pass, err := terminal.ReadPassword(0)
if err != nil {
return "", "", errors.Wrapf(err, "error reading password")
}
password = string(pass)
fmt.Println()
}
return strings.TrimSpace(username), password, err
}
// registryFromFullName gets the registry from the input. If the input is of the form
// quay.io/myuser/myimage, it will parse it and just return quay.io
// It also returns true if a full image name was given
func registryFromFullName(input string) string {
split := strings.Split(input, "/")
if len(split) > 1 {
return split[0]
}
return split[0]
}
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