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tsh.go
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tsh.go
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/*
Copyright 2016-2019 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 (
"bufio"
"bytes"
"context"
"fmt"
"io"
"io/ioutil"
"net"
"os"
"os/signal"
"path"
"runtime"
"sort"
"strings"
"syscall"
"time"
"golang.org/x/crypto/ssh"
"github.com/gravitational/teleport"
"github.com/gravitational/teleport/lib/asciitable"
"github.com/gravitational/teleport/lib/client"
"github.com/gravitational/teleport/lib/defaults"
kubeclient "github.com/gravitational/teleport/lib/kube/client"
"github.com/gravitational/teleport/lib/services"
"github.com/gravitational/teleport/lib/session"
"github.com/gravitational/teleport/lib/sshutils"
"github.com/gravitational/teleport/lib/utils"
"github.com/gravitational/kingpin"
"github.com/gravitational/trace"
gops "github.com/google/gops/agent"
"github.com/jonboulle/clockwork"
"github.com/sirupsen/logrus"
)
var log = logrus.WithFields(logrus.Fields{
trace.Component: teleport.ComponentTSH,
})
// CLIConf stores command line arguments and flags:
type CLIConf struct {
// UserHost contains "[login]@hostname" argument to SSH command
UserHost string
// Commands to execute on a remote host
RemoteCommand []string
// Username is the Teleport user's username (to login into proxies)
Username string
// Proxy keeps the hostname:port of the SSH proxy to use
Proxy string
// TTL defines how long a session must be active (in minutes)
MinsToLive int32
// SSH Port on a remote SSH host
NodePort int32
// Login on a remote SSH host
NodeLogin string
// InsecureSkipVerify bypasses verification of HTTPS certificate when talking to web proxy
InsecureSkipVerify bool
// IsUnderTest is set to true for unit testing
IsUnderTest bool
// AgentSocketAddr is address for agent listeing socket
AgentSocketAddr utils.NetAddrVal
// Remote SSH session to join
SessionID string
// Src:dest parameter for SCP
CopySpec []string
// -r flag for scp
RecursiveCopy bool
// -L flag for ssh. Local port forwarding like 'ssh -L 80:remote.host:80 -L 443:remote.host:443'
LocalForwardPorts []string
// DynamicForwardedPorts is port forwarding using SOCKS5. It is similar to
// "ssh -D 8080 example.com".
DynamicForwardedPorts []string
// ForwardAgent agent to target node. Equivalent of -A for OpenSSH.
ForwardAgent bool
// --local flag for ssh
LocalExec bool
// SiteName specifies remote site go login to
SiteName string
// Interactive, when set to true, launches remote command with the terminal attached
Interactive bool
// Quiet mode, -q command (disables progress printing)
Quiet bool
// Namespace is used to select cluster namespace
Namespace string
// NoCache is used to turn off client cache for nodes discovery
NoCache bool
// LoadSystemAgentOnly when set to true will cause tsh agent to load keys into the system agent and
// then exit. This is useful when calling tsh agent from a script (for example ~/.bash_profile)
// to load keys into your system agent.
LoadSystemAgentOnly bool
// BenchThreads is amount of concurrent threads to run
BenchThreads int
// BenchDuration is a duration for the benchmark
BenchDuration time.Duration
// BenchRate is a requests per second rate to mantain
BenchRate int
// BenchInteractive indicates that we should create interactive session
BenchInteractive bool
// Context is a context to control execution
Context context.Context
// Gops starts gops agent on a specified address
// if not specified, gops won't start
Gops bool
// GopsAddr specifies to gops addr to listen on
GopsAddr string
// IdentityFileIn is an argument to -i flag (path to the private key+cert file)
IdentityFileIn string
// Compatibility flags, --compat, specifies OpenSSH compatibility flags.
Compatibility string
// CertificateFormat defines the format of the user SSH certificate.
CertificateFormat string
// IdentityFileOut is an argument to -out flag
IdentityFileOut string
// IdentityFormat (used for --format flag for 'tsh login') defines which
// format to use with --out to store a fershly retreived certificate
IdentityFormat client.IdentityFileFormat
// BindAddr is an address in the form of host:port to bind to
// during `tsh login` command
BindAddr string
// AuthConnector is the name of the connector to use.
AuthConnector string
// SkipVersionCheck skips version checking for client and server
SkipVersionCheck bool
// Options is a list of OpenSSH options in the format used in the
// configuration file.
Options []string
// Verbose is used to print extra output.
Verbose bool
}
func main() {
cmdLineOrig := os.Args[1:]
cmdLine := []string{}
// lets see: if the executable name is 'ssh' or 'scp' we convert
// that to "tsh ssh" or "tsh scp"
switch path.Base(os.Args[0]) {
case "ssh":
cmdLine = append([]string{"ssh"}, cmdLineOrig...)
case "scp":
cmdLine = append([]string{"scp"}, cmdLineOrig...)
default:
cmdLine = cmdLineOrig
}
Run(cmdLine, false)
}
const (
clusterEnvVar = "TELEPORT_SITE"
clusterHelp = "Specify the cluster to connect"
bindAddrEnvVar = "TELEPORT_LOGIN_BIND_ADDR"
)
// Run executes TSH client. same as main() but easier to test
func Run(args []string, underTest bool) {
var cf CLIConf
cf.IsUnderTest = underTest
utils.InitLogger(utils.LoggingForCLI, logrus.WarnLevel)
// configure CLI argument parser:
app := utils.InitCLIParser("tsh", "TSH: Teleport SSH client").Interspersed(false)
app.Flag("login", "Remote host login").Short('l').Envar("TELEPORT_LOGIN").StringVar(&cf.NodeLogin)
localUser, _ := client.Username()
app.Flag("proxy", "SSH proxy address").Envar("TELEPORT_PROXY").StringVar(&cf.Proxy)
app.Flag("nocache", "do not cache cluster discovery locally").Hidden().BoolVar(&cf.NoCache)
app.Flag("user", fmt.Sprintf("SSH proxy user [%s]", localUser)).Envar("TELEPORT_USER").StringVar(&cf.Username)
app.Flag("option", "").Short('o').Hidden().AllowDuplicate().PreAction(func(ctx *kingpin.ParseContext) error {
return trace.BadParameter("invalid flag, perhaps you want to use this flag as tsh ssh -o?")
}).String()
app.Flag("ttl", "Minutes to live for a SSH session").Int32Var(&cf.MinsToLive)
app.Flag("identity", "Identity file").Short('i').StringVar(&cf.IdentityFileIn)
app.Flag("compat", "OpenSSH compatibility flag").Hidden().StringVar(&cf.Compatibility)
app.Flag("cert-format", "SSH certificate format").StringVar(&cf.CertificateFormat)
app.Flag("insecure", "Do not verify server's certificate and host name. Use only in test environments").Default("false").BoolVar(&cf.InsecureSkipVerify)
app.Flag("auth", "Specify the type of authentication connector to use.").StringVar(&cf.AuthConnector)
app.Flag("namespace", "Namespace of the cluster").Default(defaults.Namespace).Hidden().StringVar(&cf.Namespace)
app.Flag("gops", "Start gops endpoint on a given address").Hidden().BoolVar(&cf.Gops)
app.Flag("gops-addr", "Specify gops addr to listen on").Hidden().StringVar(&cf.GopsAddr)
app.Flag("skip-version-check", "Skip version checking between server and client.").BoolVar(&cf.SkipVersionCheck)
debugMode := app.Flag("debug", "Verbose logging to stdout").Short('d').Bool()
app.HelpFlag.Short('h')
ver := app.Command("version", "Print the version")
// ssh
ssh := app.Command("ssh", "Run shell or execute a command on a remote SSH node")
ssh.Arg("[user@]host", "Remote hostname and the login to use").Required().StringVar(&cf.UserHost)
ssh.Arg("command", "Command to execute on a remote host").StringsVar(&cf.RemoteCommand)
ssh.Flag("port", "SSH port on a remote host").Short('p').Int32Var(&cf.NodePort)
ssh.Flag("forward-agent", "Forward agent to target node").Short('A').BoolVar(&cf.ForwardAgent)
ssh.Flag("forward", "Forward localhost connections to remote server").Short('L').StringsVar(&cf.LocalForwardPorts)
ssh.Flag("dynamic-forward", "Forward localhost connections to remote server using SOCKS5").Short('D').StringsVar(&cf.DynamicForwardedPorts)
ssh.Flag("local", "Execute command on localhost after connecting to SSH node").Default("false").BoolVar(&cf.LocalExec)
ssh.Flag("tty", "Allocate TTY").Short('t').BoolVar(&cf.Interactive)
ssh.Flag("cluster", clusterHelp).Envar(clusterEnvVar).StringVar(&cf.SiteName)
ssh.Flag("option", "OpenSSH options in the format used in the configuration file").Short('o').AllowDuplicate().StringsVar(&cf.Options)
// join
join := app.Command("join", "Join the active SSH session")
join.Flag("cluster", clusterHelp).Envar(clusterEnvVar).StringVar(&cf.SiteName)
join.Arg("session-id", "ID of the session to join").Required().StringVar(&cf.SessionID)
// play
play := app.Command("play", "Replay the recorded SSH session")
play.Flag("cluster", clusterHelp).Envar(clusterEnvVar).StringVar(&cf.SiteName)
play.Arg("session-id", "ID of the session to play").Required().StringVar(&cf.SessionID)
// scp
scp := app.Command("scp", "Secure file copy")
scp.Flag("cluster", clusterHelp).Envar(clusterEnvVar).StringVar(&cf.SiteName)
scp.Arg("from, to", "Source and destination to copy").Required().StringsVar(&cf.CopySpec)
scp.Flag("recursive", "Recursive copy of subdirectories").Short('r').BoolVar(&cf.RecursiveCopy)
scp.Flag("port", "Port to connect to on the remote host").Short('P').Int32Var(&cf.NodePort)
scp.Flag("quiet", "Quiet mode").Short('q').BoolVar(&cf.Quiet)
// ls
ls := app.Command("ls", "List remote SSH nodes")
ls.Flag("cluster", clusterHelp).Envar(clusterEnvVar).StringVar(&cf.SiteName)
ls.Arg("labels", "List of labels to filter node list").StringVar(&cf.UserHost)
ls.Flag("verbose", clusterHelp).Short('v').BoolVar(&cf.Verbose)
// clusters
clusters := app.Command("clusters", "List available Teleport clusters")
clusters.Flag("quiet", "Quiet mode").Short('q').BoolVar(&cf.Quiet)
// login logs in with remote proxy and obtains a "session certificate" which gets
// stored in ~/.tsh directory
login := app.Command("login", "Log in to a cluster and retrieve the session certificate")
login.Flag("bind-addr", "Address in the form of host:port to bind to for login command webhook").Envar(bindAddrEnvVar).StringVar(&cf.BindAddr)
login.Flag("out", "Identity output").Short('o').AllowDuplicate().StringVar(&cf.IdentityFileOut)
login.Flag("format", fmt.Sprintf("Identity format [%s] or %s (for OpenSSH compatibility)",
client.DefaultIdentityFormat,
client.IdentityFormatOpenSSH)).Default(string(client.DefaultIdentityFormat)).StringVar((*string)(&cf.IdentityFormat))
login.Arg("cluster", clusterHelp).StringVar(&cf.SiteName)
login.Alias(loginUsageFooter)
// logout deletes obtained session certificates in ~/.tsh
logout := app.Command("logout", "Delete a cluster certificate")
// bench
bench := app.Command("bench", "Run shell or execute a command on a remote SSH node").Hidden()
bench.Flag("cluster", clusterHelp).Envar(clusterEnvVar).StringVar(&cf.SiteName)
bench.Arg("[user@]host", "Remote hostname and the login to use").Required().StringVar(&cf.UserHost)
bench.Arg("command", "Command to execute on a remote host").Required().StringsVar(&cf.RemoteCommand)
bench.Flag("port", "SSH port on a remote host").Short('p').Int32Var(&cf.NodePort)
bench.Flag("threads", "Concurrent threads to run").Default("10").IntVar(&cf.BenchThreads)
bench.Flag("duration", "Test duration").Default("1s").DurationVar(&cf.BenchDuration)
bench.Flag("rate", "Requests per second rate").Default("10").IntVar(&cf.BenchRate)
bench.Flag("interactive", "Create interactive SSH session").BoolVar(&cf.BenchInteractive)
// show key
show := app.Command("show", "Read an identity from file and print to stdout").Hidden()
show.Arg("identity_file", "The file containing a public key or a certificate").Required().StringVar(&cf.IdentityFileIn)
// The status command shows which proxy the user is logged into and metadata
// about the certificate.
status := app.Command("status", "Display the list of proxy servers and retrieved certificates")
// On Windows, hide the "ssh", "join", "play", "scp", and "bench" commands
// because they all use a terminal.
if runtime.GOOS == teleport.WindowsOS {
ssh.Hidden()
join.Hidden()
play.Hidden()
scp.Hidden()
bench.Hidden()
}
// parse CLI commands+flags:
command, err := app.Parse(args)
if err != nil {
utils.FatalError(err)
}
// apply -d flag:
if *debugMode {
utils.InitLogger(utils.LoggingForCLI, logrus.DebugLevel)
}
ctx, cancel := context.WithCancel(context.Background())
go func() {
exitSignals := make(chan os.Signal, 1)
signal.Notify(exitSignals, syscall.SIGTERM, syscall.SIGINT)
select {
case sig := <-exitSignals:
log.Debugf("signal: %v", sig)
cancel()
}
}()
cf.Context = ctx
if cf.Gops {
log.Debugf("Starting gops agent.")
err = gops.Listen(&gops.Options{Addr: cf.GopsAddr})
if err != nil {
log.Warningf("Failed to start gops agent %v.", err)
}
}
switch command {
case ver.FullCommand():
utils.PrintVersion()
case ssh.FullCommand():
onSSH(&cf)
case bench.FullCommand():
onBenchmark(&cf)
case join.FullCommand():
onJoin(&cf)
case scp.FullCommand():
onSCP(&cf)
case play.FullCommand():
onPlay(&cf)
case ls.FullCommand():
onListNodes(&cf)
case clusters.FullCommand():
onListClusters(&cf)
case login.FullCommand():
onLogin(&cf)
case logout.FullCommand():
refuseArgs(logout.FullCommand(), args)
onLogout(&cf)
case show.FullCommand():
onShow(&cf)
case status.FullCommand():
onStatus(&cf)
}
}
// onPlay replays a session with a given ID
func onPlay(cf *CLIConf) {
tc, err := makeClient(cf, true)
if err != nil {
utils.FatalError(err)
}
if err := tc.Play(context.TODO(), cf.Namespace, cf.SessionID); err != nil {
utils.FatalError(err)
}
}
// onLogin logs in with remote proxy and gets signed certificates
func onLogin(cf *CLIConf) {
var (
err error
tc *client.TeleportClient
key *client.Key
)
if cf.IdentityFileIn != "" {
utils.FatalError(trace.BadParameter("-i flag cannot be used here"))
}
if cf.IdentityFormat != client.IdentityFormatOpenSSH && cf.IdentityFormat != client.IdentityFormatFile {
utils.FatalError(trace.BadParameter("invalid identity format: %s", cf.IdentityFormat))
}
// Get the status of the active profile ~/.tsh/profile as well as the status
// of any other proxies the user is logged into.
profile, profiles, err := client.Status("", cf.Proxy)
if err != nil {
if !trace.IsNotFound(err) {
utils.FatalError(err)
}
}
// make the teleport client and retrieve the certificate from the proxy:
tc, err = makeClient(cf, true)
if err != nil {
utils.FatalError(err)
}
// client is already logged in and profile is not expired
if profile != nil && !profile.IsExpired(clockwork.NewRealClock()) {
switch {
// in case if nothing is specified, print current status
case cf.Proxy == "" && cf.SiteName == "":
printProfiles(profile, profiles)
return
// in case if parameters match, print current status
case host(cf.Proxy) == host(profile.ProxyURL.Host) && cf.SiteName == profile.Cluster:
printProfiles(profile, profiles)
return
// proxy is unspecified or the same as the currently provided proxy,
// but cluster is specified, treat this as selecting a new cluster
// for the same proxy
case (cf.Proxy == "" || host(cf.Proxy) == host(profile.ProxyURL.Host)) && cf.SiteName != "":
tc.SaveProfile("", "")
if err := kubeclient.UpdateKubeconfig(tc); err != nil {
utils.FatalError(err)
}
onStatus(cf)
return
// otherwise just passthrough to standard login
default:
}
}
if cf.Username == "" {
cf.Username = tc.Username
}
// -i flag specified? save the retreived cert into an identity file
makeIdentityFile := (cf.IdentityFileOut != "")
activateKey := !makeIdentityFile
key, err = tc.Login(cf.Context, activateKey)
if err != nil {
utils.FatalError(err)
}
if makeIdentityFile {
if err := setupNoninteractiveClient(tc, key); err != nil {
utils.FatalError(err)
}
authorities, err := tc.GetTrustedCA(cf.Context, key.ClusterName)
if err != nil {
utils.FatalError(err)
}
client.MakeIdentityFile(cf.IdentityFileOut, key, cf.IdentityFormat, authorities)
fmt.Printf("\nThe certificate has been written to %s\n", cf.IdentityFileOut)
return
}
// If the proxy is advertising that it supports Kubernetes, update kubeconfig.
if tc.KubeProxyAddr != "" {
if err := kubeclient.UpdateKubeconfig(tc); err != nil {
utils.FatalError(err)
}
}
// Regular login without -i flag.
tc.SaveProfile(key.ProxyHost, "")
// Print status to show information of the logged in user. Update the
// command line flag (used to print status) for the proxy to make sure any
// advertised settings are picked up.
webProxyHost, _ := tc.WebProxyHostPort()
cf.Proxy = webProxyHost
onStatus(cf)
}
// setupNoninteractiveClient sets up existing client to use
// non-interactive authentication methods
func setupNoninteractiveClient(tc *client.TeleportClient, key *client.Key) error {
certUsername, err := key.CertUsername()
if err != nil {
return trace.Wrap(err)
}
tc.Username = certUsername
// Extract and set the HostLogin to be the first principal. It doesn't
// matter what the value is, but some valid principal has to be set
// otherwise the certificate won't be validated.
certPrincipals, err := key.CertPrincipals()
if err != nil {
return trace.Wrap(err)
}
if len(certPrincipals) == 0 {
return trace.BadParameter("no principals found")
}
tc.HostLogin = certPrincipals[0]
identityAuth, err := authFromIdentity(key)
if err != nil {
return trace.Wrap(err)
}
tc.TLS, err = key.ClientTLSConfig()
if err != nil {
return trace.Wrap(err)
}
tc.AuthMethods = []ssh.AuthMethod{identityAuth}
tc.Interactive = false
tc.SkipLocalAuth = true
return nil
}
// onLogout deletes a "session certificate" from ~/.tsh for a given proxy
func onLogout(cf *CLIConf) {
// Extract all clusters the user is currently logged into.
active, available, err := client.Status("", "")
if err != nil {
utils.FatalError(err)
return
}
profiles := append([]*client.ProfileStatus{}, available...)
if active != nil {
profiles = append(profiles, active)
}
// Extract the proxy name.
proxyHost, _, err := net.SplitHostPort(cf.Proxy)
if err != nil {
proxyHost = cf.Proxy
}
switch {
// Proxy and username for key to remove.
case proxyHost != "" && cf.Username != "":
tc, err := makeClient(cf, true)
if err != nil {
utils.FatalError(err)
return
}
// Remove keys for this user from disk and running agent.
err = tc.Logout()
if err != nil {
if trace.IsNotFound(err) {
fmt.Printf("User %v already logged out from %v.\n", cf.Username, proxyHost)
os.Exit(1)
}
utils.FatalError(err)
return
}
// Get the address of the active Kubernetes proxy to find AuthInfos,
// Clusters, and Contexts in kubeconfig.
clusterName, _ := tc.KubeProxyHostPort()
if tc.SiteName != "" {
clusterName = fmt.Sprintf("%v.%v", tc.SiteName, clusterName)
}
// Remove Teleport related entries from kubeconfig.
log.Debugf("Removing Teleport related entries for '%v' from kubeconfig.", clusterName)
err = kubeclient.RemoveKubeconifg(tc, clusterName)
if err != nil {
utils.FatalError(err)
return
}
fmt.Printf("Logged out %v from %v.\n", cf.Username, proxyHost)
// Remove all keys.
case proxyHost == "" && cf.Username == "":
// The makeClient function requires a proxy. However this value is not used
// because the user will be logged out from all proxies. Pass a dummy value
// to allow creation of the TeleportClient.
cf.Proxy = "dummy:1234"
tc, err := makeClient(cf, true)
if err != nil {
utils.FatalError(err)
return
}
// Remove Teleport related entries from kubeconfig for all clusters.
for _, profile := range profiles {
log.Debugf("Removing Teleport related entries for '%v' from kubeconfig.", profile.Cluster)
err = kubeclient.RemoveKubeconifg(tc, profile.Cluster)
if err != nil {
utils.FatalError(err)
return
}
}
// Remove all keys from disk and the running agent.
err = tc.LogoutAll()
if err != nil {
utils.FatalError(err)
return
}
fmt.Printf("Logged out all users from all proxies.\n")
default:
fmt.Printf("Specify --proxy and --user to remove keys for specific user ")
fmt.Printf("from a proxy or neither to log out all users from all proxies.\n")
}
}
// onListNodes executes 'tsh ls' command.
func onListNodes(cf *CLIConf) {
tc, err := makeClient(cf, true)
if err != nil {
utils.FatalError(err)
}
// Get list of all nodes in backend and sort by "Node Name".
var nodes []services.Server
err = client.RetryWithRelogin(cf.Context, tc, func() error {
nodes, err = tc.ListNodes(cf.Context)
return err
})
if err != nil {
utils.FatalError(err)
}
sort.Slice(nodes, func(i, j int) bool {
return nodes[i].GetHostname() < nodes[j].GetHostname()
})
switch cf.Verbose {
// In verbose mode, print everything on a single line and include the Node
// ID (UUID). Useful for machines that need to parse the output of "tsh ls".
case true:
t := asciitable.MakeTable([]string{"Node Name", "Node ID", "Address", "Labels"})
for _, n := range nodes {
t.AddRow([]string{
n.GetHostname(), n.GetName(), n.GetAddr(), n.LabelsString(),
})
}
fmt.Println(t.AsBuffer().String())
// In normal mode chunk the labels and print two per line and allow multiple
// lines per node.
case false:
t := asciitable.MakeTable([]string{"Node Name", "Address", "Labels"})
for _, n := range nodes {
labelChunks := chunkLabels(n.GetAllLabels(), 2)
for i, v := range labelChunks {
var hostname string
var addr string
if i == 0 {
hostname = n.GetHostname()
addr = n.GetAddr()
}
t.AddRow([]string{hostname, addr, strings.Join(v, ", ")})
}
}
fmt.Println(t.AsBuffer().String())
}
}
// chunkLabels breaks labels into sized chunks. Used to improve readability
// of "tsh ls".
func chunkLabels(labels map[string]string, chunkSize int) [][]string {
// First sort labels so they always occur in the same order.
sorted := make([]string, 0, len(labels))
for k, v := range labels {
sorted = append(sorted, fmt.Sprintf("%v=%v", k, v))
}
sort.Slice(sorted, func(i, j int) bool { return sorted[i] < sorted[j] })
// Then chunk labels into sized chunks.
var chunks [][]string
for chunkSize < len(sorted) {
sorted, chunks = sorted[chunkSize:], append(chunks, sorted[0:chunkSize:chunkSize])
}
chunks = append(chunks, sorted)
return chunks
}
// onListClusters executes 'tsh clusters' command
func onListClusters(cf *CLIConf) {
tc, err := makeClient(cf, true)
if err != nil {
utils.FatalError(err)
}
proxyClient, err := tc.ConnectToProxy(cf.Context)
if err != nil {
utils.FatalError(err)
}
defer proxyClient.Close()
var sites []services.Site
err = client.RetryWithRelogin(cf.Context, tc, func() error {
sites, err = proxyClient.GetSites()
return err
})
if err != nil {
utils.FatalError(err)
}
var t asciitable.Table
if cf.Quiet {
t = asciitable.MakeHeadlessTable(2)
} else {
t = asciitable.MakeTable([]string{"Cluster Name", "Status"})
}
if len(sites) == 0 {
return
}
for _, site := range sites {
t.AddRow([]string{site.Name, site.Status})
}
fmt.Println(t.AsBuffer().String())
}
// onSSH executes 'tsh ssh' command
func onSSH(cf *CLIConf) {
tc, err := makeClient(cf, false)
if err != nil {
utils.FatalError(err)
}
tc.Stdin = os.Stdin
err = client.RetryWithRelogin(cf.Context, tc, func() error {
return tc.SSH(cf.Context, cf.RemoteCommand, cf.LocalExec)
})
if err != nil {
// exit with the same exit status as the failed command:
if tc.ExitStatus != 0 {
fmt.Fprintln(os.Stderr, utils.UserMessageFromError(err))
os.Exit(tc.ExitStatus)
} else {
utils.FatalError(err)
}
}
}
// onBenchmark executes benchmark
func onBenchmark(cf *CLIConf) {
tc, err := makeClient(cf, false)
if err != nil {
utils.FatalError(err)
}
result, err := tc.Benchmark(cf.Context, client.Benchmark{
Command: cf.RemoteCommand,
Threads: cf.BenchThreads,
Duration: cf.BenchDuration,
Rate: cf.BenchRate,
})
if err != nil {
fmt.Fprintln(os.Stderr, utils.UserMessageFromError(err))
os.Exit(255)
}
fmt.Printf("\n")
fmt.Printf("* Requests originated: %v\n", result.RequestsOriginated)
fmt.Printf("* Requests failed: %v\n", result.RequestsFailed)
if result.LastError != nil {
fmt.Printf("* Last error: %v\n", result.LastError)
}
fmt.Printf("\nHistogram\n\n")
t := asciitable.MakeTable([]string{"Percentile", "Duration"})
for _, quantile := range []float64{25, 50, 75, 90, 95, 99, 100} {
t.AddRow([]string{fmt.Sprintf("%v", quantile),
fmt.Sprintf("%v ms", result.Histogram.ValueAtQuantile(quantile)),
})
}
io.Copy(os.Stdout, t.AsBuffer())
fmt.Printf("\n")
}
// onJoin executes 'ssh join' command
func onJoin(cf *CLIConf) {
tc, err := makeClient(cf, true)
if err != nil {
utils.FatalError(err)
}
sid, err := session.ParseID(cf.SessionID)
if err != nil {
utils.FatalError(fmt.Errorf("'%v' is not a valid session ID (must be GUID)", cf.SessionID))
}
err = client.RetryWithRelogin(cf.Context, tc, func() error {
return tc.Join(context.TODO(), cf.Namespace, *sid, nil)
})
if err != nil {
utils.FatalError(err)
}
}
// onSCP executes 'tsh scp' command
func onSCP(cf *CLIConf) {
tc, err := makeClient(cf, false)
if err != nil {
utils.FatalError(err)
}
err = client.RetryWithRelogin(cf.Context, tc, func() error {
return tc.SCP(context.TODO(), cf.CopySpec, int(cf.NodePort), cf.RecursiveCopy, cf.Quiet)
})
if err != nil {
// exit with the same exit status as the failed command:
if tc.ExitStatus != 0 {
fmt.Fprintln(os.Stderr, utils.UserMessageFromError(err))
os.Exit(tc.ExitStatus)
} else {
utils.FatalError(err)
}
}
}
// makeClient takes the command-line configuration and constructs & returns
// a fully configured TeleportClient object
func makeClient(cf *CLIConf, useProfileLogin bool) (tc *client.TeleportClient, err error) {
// Parse OpenSSH style options.
options, err := parseOptions(cf.Options)
if err != nil {
return nil, trace.Wrap(err)
}
// apply defaults
if cf.MinsToLive == 0 {
cf.MinsToLive = int32(defaults.CertDuration / time.Minute)
}
// split login & host
hostLogin := cf.NodeLogin
var labels map[string]string
if cf.UserHost != "" {
parts := strings.Split(cf.UserHost, "@")
if len(parts) > 1 {
hostLogin = parts[0]
cf.UserHost = parts[1]
}
// see if remote host is specified as a set of labels
if strings.Contains(cf.UserHost, "=") {
labels, err = client.ParseLabelSpec(cf.UserHost)
if err != nil {
return nil, err
}
}
}
fPorts, err := client.ParsePortForwardSpec(cf.LocalForwardPorts)
if err != nil {
return nil, err
}
dPorts, err := client.ParseDynamicPortForwardSpec(cf.DynamicForwardedPorts)
if err != nil {
return nil, err
}
// 1: start with the defaults
c := client.MakeDefaultConfig()
// Look if a user identity was given via -i flag
if cf.IdentityFileIn != "" {
// Ignore local authentication methods when identity file is provided
c.SkipLocalAuth = true
var (
key *client.Key
identityAuth ssh.AuthMethod
expiryDate time.Time
hostAuthFunc ssh.HostKeyCallback
)
// read the ID file and create an "auth method" from it:
key, hostAuthFunc, err = loadIdentity(cf.IdentityFileIn)
if err != nil {
return nil, trace.Wrap(err)
}
if hostAuthFunc != nil {
c.HostKeyCallback = hostAuthFunc
} else {
return nil, trace.BadParameter("missing trusted certificate authorities in the identity, upgrade to newer version of tctl, export identity and try again")
}
certUsername, err := key.CertUsername()
if err != nil {
return nil, trace.Wrap(err)
}
log.Debugf("Extracted username %q from the identity file %v.", certUsername, cf.IdentityFileIn)
c.Username = certUsername
identityAuth, err = authFromIdentity(key)
if err != nil {
return nil, trace.Wrap(err)
}
c.AuthMethods = []ssh.AuthMethod{identityAuth}
// check the expiration date
expiryDate, _ = key.CertValidBefore()
if expiryDate.Before(time.Now()) {
fmt.Fprintf(os.Stderr, "WARNING: the certificate has expired on %v\n", expiryDate)
}
} else {
// load profile. if no --proxy is given use ~/.tsh/profile symlink otherwise
// fetch profile for exact proxy we are trying to connect to.
err = c.LoadProfile("", cf.Proxy)
if err != nil {
fmt.Printf("WARNING: Failed to load tsh profile for %q: %v\n", cf.Proxy, err)
}
}
// 3: override with the CLI flags
if cf.Namespace != "" {
c.Namespace = cf.Namespace
}
if cf.Username != "" {
c.Username = cf.Username
}
// if proxy is set, and proxy is not equal to profile's
// loaded addresses, override the values
if cf.Proxy != "" && c.WebProxyAddr == "" {
err = c.ParseProxyHost(cf.Proxy)
if err != nil {
return nil, trace.Wrap(err)
}
}
if len(fPorts) > 0 {
c.LocalForwardPorts = fPorts
}
if len(dPorts) > 0 {
c.DynamicForwardedPorts = dPorts
}
if cf.SiteName != "" {
c.SiteName = cf.SiteName
}
// if host logins stored in profiles must be ignored...
if !useProfileLogin {
c.HostLogin = ""
}
if hostLogin != "" {
c.HostLogin = hostLogin
}
c.Host = cf.UserHost
c.HostPort = int(cf.NodePort)
c.Labels = labels
c.KeyTTL = time.Minute * time.Duration(cf.MinsToLive)
c.InsecureSkipVerify = cf.InsecureSkipVerify
// If a TTY was requested, make sure to allocate it. Note this applies to
// "exec" command because a shell always has a TTY allocated.
if cf.Interactive || options.RequestTTY {
c.Interactive = true
}
if !cf.NoCache {
c.CachePolicy = &client.CachePolicy{}
}
// check version compatibility of the server and client
c.CheckVersions = !cf.SkipVersionCheck
// parse compatibility parameter
certificateFormat, err := parseCertificateCompatibilityFlag(cf.Compatibility, cf.CertificateFormat)
if err != nil {
return nil, trace.Wrap(err)
}
c.CertificateFormat = certificateFormat
// copy the authentication connector over
if cf.AuthConnector != "" {
c.AuthConnector = cf.AuthConnector
}
// If agent forwarding was specified on the command line enable it.
if cf.ForwardAgent || options.ForwardAgent {
c.ForwardAgent = true
}
// If the caller does not want to check host keys, pass in a insecure host
// key checker.
if options.StrictHostKeyChecking == false {
c.HostKeyCallback = client.InsecureSkipHostKeyChecking
}
c.BindAddr = cf.BindAddr
return client.NewClient(c)
}
func parseCertificateCompatibilityFlag(compatibility string, certificateFormat string) (string, error) {
switch {
// if nothing is passed in, the role will decide
case compatibility == "" && certificateFormat == "":
return teleport.CertificateFormatUnspecified, nil
// supporting the old --compat format for backward compatibility
case compatibility != "" && certificateFormat == "":
return utils.CheckCertificateFormatFlag(compatibility)
// new documented flag --cert-format
case compatibility == "" && certificateFormat != "":
return utils.CheckCertificateFormatFlag(certificateFormat)
// can not use both
default:
return "", trace.BadParameter("--compat or --cert-format must be specified")
}
}
// refuseArgs helper makes sure that 'args' (list of CLI arguments)
// does not contain anything other than command
func refuseArgs(command string, args []string) {
for _, arg := range args {
if arg == command || strings.HasPrefix(arg, "-") {
continue
} else {
utils.FatalError(trace.BadParameter("unexpected argument: %s", arg))
}
}
}
// loadIdentity loads the private key + certificate from a file
// Returns:
// - client key: user's private key+cert
// - host auth callback: function to validate the host (may be null)
// - error, if somthing happens when reading the identityf file
//
// If the "host auth callback" is not returned, user will be prompted to
// trust the proxy server.
func loadIdentity(idFn string) (*client.Key, ssh.HostKeyCallback, error) {
log.Infof("Reading identity file: %v", idFn)
f, err := os.Open(idFn)
if err != nil {
return nil, nil, trace.Wrap(err)
}
defer f.Close()
var (
keyBuf bytes.Buffer