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/image" "github.com/docker/docker-credential-helpers/credentials" "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 [flags] REGISTRY", Short: "Login to a container registry", Long: loginDescription, RunE: func(cmd *cobra.Command, args []string) error { loginCommand.InputArgs = args loginCommand.GlobalFlags = MainGlobalOpts loginCommand.Remote = remoteclient return loginCmd(&loginCommand) }, Example: `podman login -u testuser -p testpassword localhost:5000 podman login --authfile authdir/myauths.json quay.io podman login -u testuser -p testpassword localhost:5000`, } ) func init() { loginCommand.Command = _loginCommand loginCommand.SetHelpTemplate(HelpTemplate()) 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") 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 := image.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) // Do not return error if no credentials found in credHelpers, new credentials will be stored by config.SetAuthentication if err != nil && err != credentials.NewErrCredentialsNotFound() { 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] }