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main.go
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/*
Copyright 2015 Gravitational, Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"net"
"os"
"strconv"
"strings"
"time"
"github.com/gravitational/teleport"
"github.com/gravitational/teleport/lib/auth"
"github.com/gravitational/teleport/lib/auth/native"
"github.com/gravitational/teleport/lib/config"
"github.com/gravitational/teleport/lib/defaults"
"github.com/gravitational/teleport/lib/service"
"github.com/gravitational/teleport/lib/services"
"github.com/gravitational/teleport/lib/sshutils"
"github.com/gravitational/teleport/lib/utils"
"github.com/gravitational/teleport/lib/web"
"github.com/buger/goterm"
"github.com/gravitational/trace"
"github.com/pborman/uuid"
"golang.org/x/crypto/ssh"
)
type CLIConfig struct {
Debug bool
}
type UserCommand struct {
config *service.Config
login string
allowedLogins string
identities []string
}
type NodeCommand struct {
config *service.Config
// count is optional hidden field that will cause
// tctl issue count tokens and output them in JSON format
count int
// format is the output format, e.g. text or json
format string
}
type AuthCommand struct {
config *service.Config
authType string
genPubPath string
genPrivPath string
genSigningKeyPath string
genRole teleport.Role
genAuthorityDomain string
exportAuthorityFingerprint string
exportPrivateKeys bool
}
type AuthServerCommand struct {
config *service.Config
}
type ReverseTunnelCommand struct {
config *service.Config
domainNames string
dialAddrs utils.NetAddrList
ttl time.Duration
}
func main() {
utils.InitLoggerCLI()
app := utils.InitCLIParser("tctl", GlobalHelpString)
// generate default tctl configuration:
cfg := service.MakeDefaultConfig()
cmdUsers := UserCommand{config: cfg}
cmdNodes := NodeCommand{config: cfg}
cmdAuth := AuthCommand{config: cfg}
cmdAuthServers := AuthServerCommand{config: cfg}
cmdReverseTunnel := ReverseTunnelCommand{config: cfg}
// define global flags:
var ccf CLIConfig
app.Flag("debug", "Enable verbose logging to stderr").
Short('d').
BoolVar(&ccf.Debug)
// commands:
ver := app.Command("version", "Print the version.")
app.HelpFlag.Short('h')
// user add command:
users := app.Command("users", "Manage users logins")
userAdd := users.Command("add", "Generates an invitation token and prints the signup URL for setting up 2nd factor auth.")
userAdd.Arg("login", "Teleport user login").Required().StringVar(&cmdUsers.login)
userAdd.Arg("local-logins", "Local UNIX users this account can log in as [login]").
Default("").StringVar(&cmdUsers.allowedLogins)
userAdd.Flag("identity", "[EXPERIMENTAL] Add OpenID Connect identity, e.g. --identity=google:bob@gmail.com").Hidden().StringsVar(&cmdUsers.identities)
userAdd.Alias(AddUserHelp)
// list users command
userList := users.Command("ls", "Lists all user accounts")
// delete user command
userDelete := users.Command("del", "Deletes user accounts")
userDelete.Arg("logins", "Comma-separated list of user logins to delete").
Required().StringVar(&cmdUsers.login)
// add node command
nodes := app.Command("nodes", "Issue invites for other nodes to join the cluster")
nodeAdd := nodes.Command("add", "Adds a new SSH node to join the cluster")
nodeAdd.Flag("count", "add count tokens and output JSON with the list").Hidden().Default("1").IntVar(&cmdNodes.count)
nodeAdd.Flag("format", "output format, 'text' or 'json'").Hidden().Default("text").StringVar(&cmdNodes.format)
nodeAdd.Alias(AddNodeHelp)
nodeList := nodes.Command("ls", "Lists all active SSH nodes within the cluster")
nodeList.Alias(ListNodesHelp)
// operations with authorities
auth := app.Command("authorities", "Operations with user and host certificate authorities").Hidden()
auth.Flag("type", "authority type, 'user' or 'host'").Default(string(services.UserCA)).StringVar(&cmdAuth.authType)
authList := auth.Command("ls", "List trusted user certificate authorities").Hidden()
authExport := auth.Command("export", "Export concatenated keys to standard output").Hidden()
authExport.Flag("private-keys", "if set, will print private keys").BoolVar(&cmdAuth.exportPrivateKeys)
authExport.Flag("fingerprint", "filter authority by fingerprint").StringVar(&cmdAuth.exportAuthorityFingerprint)
authGenerate := auth.Command("gen", "Generate new OpenSSH keypair").Hidden()
authGenerate.Flag("pub-key", "path to the public key to write").Required().StringVar(&cmdAuth.genPubPath)
authGenerate.Flag("priv-key", "path to the private key to write").Required().StringVar(&cmdAuth.genPrivPath)
authGenAndSign := auth.Command("gencert", "Generate OpenSSH keys and certificate for a joining teleport proxy, node or auth server").Hidden()
authGenAndSign.Flag("priv-key", "path to the private key to write").Required().StringVar(&cmdAuth.genPrivPath)
authGenAndSign.Flag("cert", "path to the public signed cert to write").Required().StringVar(&cmdAuth.genPubPath)
authGenAndSign.Flag("sign-key", "path to the private OpenSSH signing key").Required().StringVar(&cmdAuth.genSigningKeyPath)
authGenAndSign.Flag("role", "server role, e.g. 'proxy', 'auth' or 'node'").Required().SetValue(&cmdAuth.genRole)
authGenAndSign.Flag("domain", "cluster certificate authority domain name").Required().StringVar(&cmdAuth.genAuthorityDomain)
// operations with auth servers
authServers := app.Command("authservers", "Operations with user and host certificate authorities").Hidden()
authServerAdd := authServers.Command("add", "Add a new auth server node to the cluster").Hidden()
// operations with reverse tunnels
reverseTunnels := app.Command("rts", "Operations with reverse tunnels").Hidden()
reverseTunnelsList := reverseTunnels.Command("ls", "List reverse tunnels").Hidden()
reverseTunnelsDelete := reverseTunnels.Command("del", "Deletes reverse tunnels").Hidden()
reverseTunnelsDelete.Arg("domain", "Comma-separated list of reverse tunnels to delete").
Required().StringVar(&cmdReverseTunnel.domainNames)
reverseTunnelsUpsert := reverseTunnels.Command("upsert", "Update or add a new reverse tunnel").Hidden()
reverseTunnelsUpsert.Arg("domain", "Domain name of the reverse tunnel").
Required().StringVar(&cmdReverseTunnel.domainNames)
reverseTunnelsUpsert.Arg("addrs", "Comma-separated list of dial addresses for reverse tunnels to dial").
Required().SetValue(&cmdReverseTunnel.dialAddrs)
reverseTunnelsUpsert.Flag("ttl", "Optional TTL (time to live) for reverse tunnel").DurationVar(&cmdReverseTunnel.ttl)
// parse CLI commands+flags:
command, err := app.Parse(os.Args[1:])
if err != nil {
utils.FatalError(err)
}
// --debug flag
if ccf.Debug {
utils.InitLoggerDebug()
}
validateConfig(cfg)
// some commands do not need a connection to client
switch command {
case authGenerate.FullCommand():
err = cmdAuth.GenerateKeys()
if err != nil {
utils.FatalError(err)
}
return
case authGenAndSign.FullCommand():
err = cmdAuth.GenerateAndSignKeys()
if err != nil {
utils.FatalError(err)
}
return
}
// connect to the teleport auth service:
client, err := connectToAuthService(cfg)
if err != nil {
utils.FatalError(err)
}
// execute the selected command:
switch command {
case ver.FullCommand():
onVersion()
case userAdd.FullCommand():
err = cmdUsers.Add(client)
case userList.FullCommand():
err = cmdUsers.List(client)
case userDelete.FullCommand():
err = cmdUsers.Delete(client)
case nodeAdd.FullCommand():
err = cmdNodes.Invite(client)
case nodeList.FullCommand():
err = cmdNodes.ListActive(client)
case authList.FullCommand():
err = cmdAuth.ListAuthorities(client)
case authExport.FullCommand():
err = cmdAuth.ExportAuthorities(client)
case authServerAdd.FullCommand():
err = cmdAuthServers.Invite(client)
case reverseTunnelsList.FullCommand():
err = cmdReverseTunnel.ListActive(client)
case reverseTunnelsDelete.FullCommand():
err = cmdReverseTunnel.Delete(client)
case reverseTunnelsUpsert.FullCommand():
err = cmdReverseTunnel.Upsert(client)
}
if err != nil {
utils.FatalError(err)
}
}
func onVersion() {
utils.PrintVersion()
}
func printHeader(t *goterm.Table, cols []string) {
dots := make([]string, len(cols))
for i := range dots {
dots[i] = strings.Repeat("-", len(cols[i]))
}
fmt.Fprint(t, strings.Join(cols, "\t")+"\n")
fmt.Fprint(t, strings.Join(dots, "\t")+"\n")
}
// Add creates a new sign-up token and prints a token URL to stdout.
// A user is not created until he visits the sign-up URL and completes the process
func (u *UserCommand) Add(client *auth.TunClient) error {
// if no local logins were specified, default to 'login'
if u.allowedLogins == "" {
u.allowedLogins = u.login
}
user := services.TeleportUser{
Name: u.login,
AllowedLogins: strings.Split(u.allowedLogins, ","),
}
if len(u.identities) != 0 {
for _, identityVar := range u.identities {
vals := strings.SplitN(identityVar, ":", 2)
if len(vals) != 2 {
return trace.Errorf("bad flag --identity=%v, expected <connector-id>:<email> format", identityVar)
}
user.OIDCIdentities = append(user.OIDCIdentities, services.OIDCIdentity{ConnectorID: vals[0], Email: vals[1]})
}
}
token, err := client.CreateSignupToken(&user)
if err != nil {
return err
}
proxies, err := client.GetProxies()
if err != nil {
return trace.Wrap(err)
}
if len(proxies) == 0 {
return trace.Errorf("Cannot add users to a cluster without a proxy")
}
hostname := proxies[0].Hostname
url := web.CreateSignupLink(net.JoinHostPort(hostname, strconv.Itoa(defaults.HTTPListenPort)), token)
fmt.Printf("Signup token has been created and is valid for %v seconds. Share this URL with the user:\n%v\n\nNOTE: make sure the hostname is accessible!\n", defaults.MaxSignupTokenTTL.Seconds(), url)
return nil
}
// List prints all existing user accounts
func (u *UserCommand) List(client *auth.TunClient) error {
users, err := client.GetUsers()
if err != nil {
return trace.Wrap(err)
}
usersView := func(users []services.User) string {
t := goterm.NewTable(0, 10, 5, ' ', 0)
printHeader(t, []string{"User", "Allowed to login as"})
if len(users) == 0 {
return t.String()
}
for _, u := range users {
fmt.Fprintf(t, "%v\t%v\n", u.GetName(), strings.Join(u.GetAllowedLogins(), ","))
}
return t.String()
}
fmt.Printf(usersView(users))
return nil
}
// Delete deletes teleport user(s). User IDs are passed as a comma-separated
// list in UserCommand.login
func (u *UserCommand) Delete(client *auth.TunClient) error {
for _, l := range strings.Split(u.login, ",") {
if err := client.DeleteUser(l); err != nil {
return trace.Wrap(err)
}
fmt.Printf("User '%v' has been deleted\n", l)
}
return nil
}
// Invite generates a token which can be used to add another SSH node
// to a cluster
func (u *NodeCommand) Invite(client *auth.TunClient) error {
if u.count < 1 {
return trace.BadParameter("count should be > 0, got %v", u.count)
}
var tokens []string
for i := 0; i < u.count; i++ {
token, err := client.GenerateToken(teleport.RoleNode, defaults.MaxProvisioningTokenTTL)
if err != nil {
return trace.Wrap(err)
}
tokens = append(tokens, token)
}
authServers, err := client.GetAuthServers()
if err != nil {
return trace.Wrap(err)
}
if len(authServers) == 0 {
return trace.Errorf("This cluster does not have any auth servers running")
}
if u.format == "text" {
for _, token := range tokens {
fmt.Printf(
"The invite token: %v\nRun this on the new node to join the cluster:\n> teleport start --roles=node --token=%v --auth-server=%v\n\nNotes:\n",
token, token, authServers[0].Addr)
}
fmt.Printf(" 1. This invitation token will expire in %v seconds.\n", defaults.MaxProvisioningTokenTTL.Seconds())
fmt.Printf(" 2. %v auth server is reachable from the node, see --advertise-ip server flag\n", authServers[0].Addr)
} else {
out, err := json.Marshal(tokens)
if err != nil {
return trace.Wrap(err, "failed to marshal tokens")
}
fmt.Printf(string(out))
}
return nil
}
// ListActive retreives the list of nodes who recently sent heartbeats to
// to a cluster and prints it to stdout
func (u *NodeCommand) ListActive(client *auth.TunClient) error {
nodes, err := client.GetNodes()
if err != nil {
return trace.Wrap(err)
}
nodesView := func(nodes []services.Server) string {
t := goterm.NewTable(0, 10, 5, ' ', 0)
printHeader(t, []string{"Node Name", "Node ID", "Address", "Labels"})
if len(nodes) == 0 {
return t.String()
}
for _, n := range nodes {
fmt.Fprintf(t, "%v\t%v\t%v\t%v\n", n.Hostname, n.ID, n.Addr, n.LabelsString())
}
return t.String()
}
fmt.Printf(nodesView(nodes))
return nil
}
// ListAuthorities shows list of user authorities we trust
func (a *AuthCommand) ListAuthorities(client *auth.TunClient) error {
authType := services.CertAuthType(a.authType)
if err := authType.Check(); err != nil {
return trace.Wrap(err)
}
authorities, err := client.GetCertAuthorities(authType, false)
if err != nil {
return trace.Wrap(err)
}
view := func() string {
t := goterm.NewTable(0, 10, 5, ' ', 0)
printHeader(t, []string{"Type", "Authority Domain", "Fingerprint", "Restricted to logins"})
if len(authorities) == 0 {
return t.String()
}
for _, a := range authorities {
for _, keyBytes := range a.CheckingKeys {
fingerprint, err := sshutils.AuthorizedKeyFingerprint(keyBytes)
if err != nil {
fingerprint = fmt.Sprintf("<bad key: %v", err)
}
fmt.Fprintf(t, "%v\t%v\t%v\t%v\n", a.Type, a.DomainName, fingerprint, strings.Join(a.AllowedLogins, ","))
}
}
return t.String()
}
fmt.Printf(view())
return nil
}
// ExportAuthorities outputs the list of authorities in OpenSSH compatible formats
func (a *AuthCommand) ExportAuthorities(client *auth.TunClient) error {
authType := services.CertAuthType(a.authType)
if err := authType.Check(); err != nil {
return trace.Wrap(err)
}
authorities, err := client.GetCertAuthorities(authType, a.exportPrivateKeys)
if err != nil {
return trace.Wrap(err)
}
for _, ca := range authorities {
if a.exportPrivateKeys {
for _, key := range ca.SigningKeys {
fingerprint, err := sshutils.PrivateKeyFingerprint(key)
if err != nil {
return trace.Wrap(err)
}
if a.exportAuthorityFingerprint != "" && fingerprint != a.exportAuthorityFingerprint {
continue
}
os.Stdout.Write(key)
fmt.Fprintf(os.Stdout, "\n")
}
} else {
for _, keyBytes := range ca.CheckingKeys {
fingerprint, err := sshutils.AuthorizedKeyFingerprint(keyBytes)
if err != nil {
return trace.Wrap(err)
}
if a.exportAuthorityFingerprint != "" && fingerprint != a.exportAuthorityFingerprint {
continue
}
if authType == services.UserCA {
// for user authorities, export in the sshd's TrustedUserCAKeys format
os.Stdout.Write(keyBytes)
} else {
// for host authorities export them in the authorized_keys - compatible format
fmt.Fprintf(os.Stdout, "@cert-authority *.%v %v", ca.DomainName, string(keyBytes))
}
}
}
}
return nil
}
// Invite generates a token which can be used to add another SSH auth server
// to the cluster
func (u *AuthServerCommand) Invite(client *auth.TunClient) error {
authDomainName, err := client.GetLocalDomain()
if err != nil {
return trace.Wrap(err)
}
token, err := client.GenerateToken(teleport.RoleAuth, defaults.InviteTokenTTL)
if err != nil {
return trace.Wrap(err)
}
cfg := config.MakeAuthPeerFileConfig(authDomainName, token)
out := cfg.DebugDumpToYAML()
fmt.Printf(
"# Run this config the new auth server to join the cluster:\n# > teleport start --config config.yaml\n# Fill in auth peers in this config:\n")
fmt.Println(out)
return nil
}
// GenerateKeys generates a new keypair
func (a *AuthCommand) GenerateKeys() error {
keygen := native.New()
defer keygen.Close()
privBytes, pubBytes, err := keygen.GenerateKeyPair("")
if err != nil {
return trace.Wrap(err)
}
err = ioutil.WriteFile(a.genPubPath, pubBytes, 0600)
if err != nil {
return trace.Wrap(err)
}
err = ioutil.WriteFile(a.genPrivPath, privBytes, 0600)
if err != nil {
return trace.Wrap(err)
}
fmt.Printf("wrote public key to: %v and private key to: %v\n", a.genPubPath, a.genPrivPath)
return nil
}
// GenerateAndSignKeys generates a new keypair and signs it for role
func (a *AuthCommand) GenerateAndSignKeys() error {
privSigningKeyBytes, err := ioutil.ReadFile(a.genSigningKeyPath)
if err != nil {
return trace.Wrap(err)
}
ca := native.New()
defer ca.Close()
privBytes, pubBytes, err := ca.GenerateKeyPair("")
if err != nil {
return trace.Wrap(err)
}
nodeID := uuid.New()
certBytes, err := ca.GenerateHostCert(privSigningKeyBytes, pubBytes, nodeID, a.genAuthorityDomain, a.genRole, 0)
if err != nil {
return trace.Wrap(err)
}
err = ioutil.WriteFile(a.genPubPath, certBytes, 0600)
if err != nil {
return trace.Wrap(err)
}
err = ioutil.WriteFile(a.genPrivPath, privBytes, 0600)
if err != nil {
return trace.Wrap(err)
}
fmt.Printf("wrote signed certificate to: %v and private key to: %v\n", a.genPubPath, a.genPrivPath)
return nil
}
// ListActive retreives the list of nodes who recently sent heartbeats to
// to a cluster and prints it to stdout
func (r *ReverseTunnelCommand) ListActive(client *auth.TunClient) error {
tunnels, err := client.GetReverseTunnels()
if err != nil {
return trace.Wrap(err)
}
tunnelsView := func() string {
t := goterm.NewTable(0, 10, 5, ' ', 0)
printHeader(t, []string{"Domain", "Dial Addresses"})
if len(tunnels) == 0 {
return t.String()
}
for _, tunnel := range tunnels {
fmt.Fprintf(t, "%v\t%v\n", tunnel.DomainName, strings.Join(tunnel.DialAddrs, ","))
}
return t.String()
}
fmt.Printf(tunnelsView())
return nil
}
// Upsert updates or inserts new reverse tunnel
func (r *ReverseTunnelCommand) Upsert(client *auth.TunClient) error {
err := client.UpsertReverseTunnel(services.ReverseTunnel{
DomainName: r.domainNames,
DialAddrs: r.dialAddrs.Addresses()},
r.ttl)
if err != nil {
return trace.Wrap(err)
}
fmt.Printf("Reverse tunnel updated\n")
return nil
}
// Delete deletes teleport user(s). User IDs are passed as a comma-separated
// list in UserCommand.login
func (r *ReverseTunnelCommand) Delete(client *auth.TunClient) error {
for _, domainName := range strings.Split(r.domainNames, ",") {
if err := client.DeleteReverseTunnel(domainName); err != nil {
return trace.Wrap(err)
}
fmt.Printf("Reverse tunnel '%v' has been deleted\n", domainName)
}
return nil
}
// connectToAuthService creates a valid client connection to the auth service
func connectToAuthService(cfg *service.Config) (client *auth.TunClient, err error) {
// connect to the local auth server by default:
cfg.Auth.Enabled = true
cfg.AuthServers = []utils.NetAddr{
*defaults.AuthConnectAddr(),
}
// read the host SSH keys and use them to open an SSH connection to the auth service
i, err := auth.ReadIdentity(cfg.DataDir, auth.IdentityID{Role: teleport.RoleAdmin, HostUUID: cfg.HostUUID})
if err != nil {
return nil, trace.Wrap(err)
}
client, err = auth.NewTunClient(
cfg.AuthServers,
cfg.HostUUID,
[]ssh.AuthMethod{ssh.PublicKeys(i.KeySigner)})
if err != nil {
return nil, trace.Wrap(err)
}
// check connectivity by calling something on a clinet:
_, err = client.GetDialer()()
if err != nil {
utils.Consolef(os.Stderr,
"Cannot connect to the auth server: %v.\nIs the auth server running on %v?", err, cfg.AuthServers[0].Addr)
os.Exit(1)
}
return client, nil
}
// validateConfig updtes&validates tctl configuration
func validateConfig(cfg *service.Config) {
var err error
// read or generate a host UUID for this node
cfg.HostUUID, err = utils.ReadOrMakeHostUUID(cfg.DataDir)
if err != nil {
utils.FatalError(err)
}
}