/
localclient.go
1516 lines (1367 loc) · 49.7 KB
/
localclient.go
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// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
//go:build go1.19
package tailscale
import (
"bytes"
"cmp"
"context"
"crypto/tls"
"encoding/json"
"errors"
"fmt"
"io"
"net"
"net/http"
"net/http/httptrace"
"net/netip"
"net/url"
"os/exec"
"runtime"
"strconv"
"strings"
"sync"
"time"
"go4.org/mem"
"tailscale.com/client/tailscale/apitype"
"tailscale.com/drive"
"tailscale.com/envknob"
"tailscale.com/ipn"
"tailscale.com/ipn/ipnstate"
"tailscale.com/net/netutil"
"tailscale.com/paths"
"tailscale.com/safesocket"
"tailscale.com/tailcfg"
"tailscale.com/tka"
"tailscale.com/types/key"
"tailscale.com/types/tkatype"
)
// defaultLocalClient is the default LocalClient when using the legacy
// package-level functions.
var defaultLocalClient LocalClient
// LocalClient is a client to Tailscale's "LocalAPI", communicating with the
// Tailscale daemon on the local machine. Its API is not necessarily stable and
// subject to changes between releases. Some API calls have stricter
// compatibility guarantees, once they've been widely adopted. See method docs
// for details.
//
// Its zero value is valid to use.
//
// Any exported fields should be set before using methods on the type
// and not changed thereafter.
type LocalClient struct {
// Dial optionally specifies an alternate func that connects to the local
// machine's tailscaled or equivalent. If nil, a default is used.
Dial func(ctx context.Context, network, addr string) (net.Conn, error)
// Socket specifies an alternate path to the local Tailscale socket.
// If empty, a platform-specific default is used.
Socket string
// UseSocketOnly, if true, tries to only connect to tailscaled via the
// Unix socket and not via fallback mechanisms as done on macOS when
// connecting to the GUI client variants.
UseSocketOnly bool
// tsClient does HTTP requests to the local Tailscale daemon.
// It's lazily initialized on first use.
tsClient *http.Client
tsClientOnce sync.Once
}
func (lc *LocalClient) socket() string {
if lc.Socket != "" {
return lc.Socket
}
return paths.DefaultTailscaledSocket()
}
func (lc *LocalClient) dialer() func(ctx context.Context, network, addr string) (net.Conn, error) {
if lc.Dial != nil {
return lc.Dial
}
return lc.defaultDialer
}
func (lc *LocalClient) defaultDialer(ctx context.Context, network, addr string) (net.Conn, error) {
if addr != "local-tailscaled.sock:80" {
return nil, fmt.Errorf("unexpected URL address %q", addr)
}
if !lc.UseSocketOnly {
// On macOS, when dialing from non-sandboxed program to sandboxed GUI running
// a TCP server on a random port, find the random port. For HTTP connections,
// we don't send the token. It gets added in an HTTP Basic-Auth header.
if port, _, err := safesocket.LocalTCPPortAndToken(); err == nil {
// We use 127.0.0.1 and not "localhost" (issue 7851).
var d net.Dialer
return d.DialContext(ctx, "tcp", "127.0.0.1:"+strconv.Itoa(port))
}
}
return safesocket.Connect(lc.socket())
}
// DoLocalRequest makes an HTTP request to the local machine's Tailscale daemon.
//
// URLs are of the form http://local-tailscaled.sock/localapi/v0/whois?ip=1.2.3.4.
//
// The hostname must be "local-tailscaled.sock", even though it
// doesn't actually do any DNS lookup. The actual means of connecting to and
// authenticating to the local Tailscale daemon vary by platform.
//
// DoLocalRequest may mutate the request to add Authorization headers.
func (lc *LocalClient) DoLocalRequest(req *http.Request) (*http.Response, error) {
req.Header.Set("Tailscale-Cap", strconv.Itoa(int(tailcfg.CurrentCapabilityVersion)))
lc.tsClientOnce.Do(func() {
lc.tsClient = &http.Client{
Transport: &http.Transport{
DialContext: lc.dialer(),
},
}
})
if _, token, err := safesocket.LocalTCPPortAndToken(); err == nil {
req.SetBasicAuth("", token)
}
return lc.tsClient.Do(req)
}
func (lc *LocalClient) doLocalRequestNiceError(req *http.Request) (*http.Response, error) {
res, err := lc.DoLocalRequest(req)
if err == nil {
if server := res.Header.Get("Tailscale-Version"); server != "" && server != envknob.IPCVersion() && onVersionMismatch != nil {
onVersionMismatch(envknob.IPCVersion(), server)
}
if res.StatusCode == 403 {
all, _ := io.ReadAll(res.Body)
return nil, &AccessDeniedError{errors.New(errorMessageFromBody(all))}
}
if res.StatusCode == http.StatusPreconditionFailed {
all, _ := io.ReadAll(res.Body)
return nil, &PreconditionsFailedError{errors.New(errorMessageFromBody(all))}
}
return res, nil
}
if ue, ok := err.(*url.Error); ok {
if oe, ok := ue.Err.(*net.OpError); ok && oe.Op == "dial" {
path := req.URL.Path
pathPrefix, _, _ := strings.Cut(path, "?")
return nil, fmt.Errorf("Failed to connect to local Tailscale daemon for %s; %s Error: %w", pathPrefix, tailscaledConnectHint(), oe)
}
}
return nil, err
}
type errorJSON struct {
Error string
}
// AccessDeniedError is an error due to permissions.
type AccessDeniedError struct {
err error
}
func (e *AccessDeniedError) Error() string { return fmt.Sprintf("Access denied: %v", e.err) }
func (e *AccessDeniedError) Unwrap() error { return e.err }
// IsAccessDeniedError reports whether err is or wraps an AccessDeniedError.
func IsAccessDeniedError(err error) bool {
var ae *AccessDeniedError
return errors.As(err, &ae)
}
// PreconditionsFailedError is returned when the server responds
// with an HTTP 412 status code.
type PreconditionsFailedError struct {
err error
}
func (e *PreconditionsFailedError) Error() string {
return fmt.Sprintf("Preconditions failed: %v", e.err)
}
func (e *PreconditionsFailedError) Unwrap() error { return e.err }
// IsPreconditionsFailedError reports whether err is or wraps an PreconditionsFailedError.
func IsPreconditionsFailedError(err error) bool {
var ae *PreconditionsFailedError
return errors.As(err, &ae)
}
// bestError returns either err, or if body contains a valid JSON
// object of type errorJSON, its non-empty error body.
func bestError(err error, body []byte) error {
var j errorJSON
if err := json.Unmarshal(body, &j); err == nil && j.Error != "" {
return errors.New(j.Error)
}
return err
}
func errorMessageFromBody(body []byte) string {
var j errorJSON
if err := json.Unmarshal(body, &j); err == nil && j.Error != "" {
return j.Error
}
return strings.TrimSpace(string(body))
}
var onVersionMismatch func(clientVer, serverVer string)
// SetVersionMismatchHandler sets f as the version mismatch handler
// to be called when the client (the current process) has a version
// number that doesn't match the server's declared version.
func SetVersionMismatchHandler(f func(clientVer, serverVer string)) {
onVersionMismatch = f
}
func (lc *LocalClient) send(ctx context.Context, method, path string, wantStatus int, body io.Reader) ([]byte, error) {
slurp, _, err := lc.sendWithHeaders(ctx, method, path, wantStatus, body, nil)
return slurp, err
}
func (lc *LocalClient) sendWithHeaders(
ctx context.Context,
method,
path string,
wantStatus int,
body io.Reader,
h http.Header,
) ([]byte, http.Header, error) {
if jr, ok := body.(jsonReader); ok && jr.err != nil {
return nil, nil, jr.err // fail early if there was a JSON marshaling error
}
req, err := http.NewRequestWithContext(ctx, method, "http://"+apitype.LocalAPIHost+path, body)
if err != nil {
return nil, nil, err
}
if h != nil {
req.Header = h
}
res, err := lc.doLocalRequestNiceError(req)
if err != nil {
return nil, nil, err
}
defer res.Body.Close()
slurp, err := io.ReadAll(res.Body)
if err != nil {
return nil, nil, err
}
if res.StatusCode != wantStatus {
err = fmt.Errorf("%v: %s", res.Status, bytes.TrimSpace(slurp))
return nil, nil, bestError(err, slurp)
}
return slurp, res.Header, nil
}
func (lc *LocalClient) get200(ctx context.Context, path string) ([]byte, error) {
return lc.send(ctx, "GET", path, 200, nil)
}
// WhoIs returns the owner of the remoteAddr, which must be an IP or IP:port.
//
// Deprecated: use LocalClient.WhoIs.
func WhoIs(ctx context.Context, remoteAddr string) (*apitype.WhoIsResponse, error) {
return defaultLocalClient.WhoIs(ctx, remoteAddr)
}
func decodeJSON[T any](b []byte) (ret T, err error) {
if err := json.Unmarshal(b, &ret); err != nil {
var zero T
return zero, fmt.Errorf("failed to unmarshal JSON into %T: %w", ret, err)
}
return ret, nil
}
// WhoIs returns the owner of the remoteAddr, which must be an IP or IP:port.
func (lc *LocalClient) WhoIs(ctx context.Context, remoteAddr string) (*apitype.WhoIsResponse, error) {
body, err := lc.get200(ctx, "/localapi/v0/whois?addr="+url.QueryEscape(remoteAddr))
if err != nil {
return nil, err
}
return decodeJSON[*apitype.WhoIsResponse](body)
}
// Goroutines returns a dump of the Tailscale daemon's current goroutines.
func (lc *LocalClient) Goroutines(ctx context.Context) ([]byte, error) {
return lc.get200(ctx, "/localapi/v0/goroutines")
}
// DaemonMetrics returns the Tailscale daemon's metrics in
// the Prometheus text exposition format.
func (lc *LocalClient) DaemonMetrics(ctx context.Context) ([]byte, error) {
return lc.get200(ctx, "/localapi/v0/metrics")
}
// IncrementCounter increments the value of a Tailscale daemon's counter
// metric by the given delta. If the metric has yet to exist, a new counter
// metric is created and initialized to delta.
//
// IncrementCounter does not support gauge metrics or negative delta values.
func (lc *LocalClient) IncrementCounter(ctx context.Context, name string, delta int) error {
type metricUpdate struct {
Name string `json:"name"`
Type string `json:"type"`
Value int `json:"value"` // amount to increment by
}
if delta < 0 {
return errors.New("negative delta not allowed")
}
_, err := lc.send(ctx, "POST", "/localapi/v0/upload-client-metrics", 200, jsonBody([]metricUpdate{{
Name: name,
Type: "counter",
Value: delta,
}}))
return err
}
// TailDaemonLogs returns a stream the Tailscale daemon's logs as they arrive.
// Close the context to stop the stream.
func (lc *LocalClient) TailDaemonLogs(ctx context.Context) (io.Reader, error) {
req, err := http.NewRequestWithContext(ctx, "GET", "http://"+apitype.LocalAPIHost+"/localapi/v0/logtap", nil)
if err != nil {
return nil, err
}
res, err := lc.doLocalRequestNiceError(req)
if err != nil {
return nil, err
}
if res.StatusCode != 200 {
return nil, errors.New(res.Status)
}
return res.Body, nil
}
// Pprof returns a pprof profile of the Tailscale daemon.
func (lc *LocalClient) Pprof(ctx context.Context, pprofType string, sec int) ([]byte, error) {
var secArg string
if sec < 0 || sec > 300 {
return nil, errors.New("duration out of range")
}
if sec != 0 || pprofType == "profile" {
secArg = fmt.Sprint(sec)
}
return lc.get200(ctx, fmt.Sprintf("/localapi/v0/pprof?name=%s&seconds=%v", url.QueryEscape(pprofType), secArg))
}
// BugReportOpts contains options to pass to the Tailscale daemon when
// generating a bug report.
type BugReportOpts struct {
// Note contains an optional user-provided note to add to the logs.
Note string
// Diagnose specifies whether to print additional diagnostic information to
// the logs when generating this bugreport.
Diagnose bool
// Record specifies, if non-nil, whether to perform a bugreport
// "recording"–generating an initial log marker, then waiting for
// this channel to be closed before finishing the request, which
// generates another log marker.
Record <-chan struct{}
}
// BugReportWithOpts logs and returns a log marker that can be shared by the
// user with support.
//
// The opts type specifies options to pass to the Tailscale daemon when
// generating this bug report.
func (lc *LocalClient) BugReportWithOpts(ctx context.Context, opts BugReportOpts) (string, error) {
qparams := make(url.Values)
if opts.Note != "" {
qparams.Set("note", opts.Note)
}
if opts.Diagnose {
qparams.Set("diagnose", "true")
}
if opts.Record != nil {
qparams.Set("record", "true")
}
ctx, cancel := context.WithCancel(ctx)
defer cancel()
var requestBody io.Reader
if opts.Record != nil {
pr, pw := io.Pipe()
requestBody = pr
// This goroutine waits for the 'Record' channel to be closed,
// and then closes the write end of our pipe to unblock the
// reader.
go func() {
defer pw.Close()
select {
case <-opts.Record:
case <-ctx.Done():
}
}()
}
// lc.send might block if opts.Record != nil; see above.
uri := fmt.Sprintf("/localapi/v0/bugreport?%s", qparams.Encode())
body, err := lc.send(ctx, "POST", uri, 200, requestBody)
if err != nil {
return "", err
}
return strings.TrimSpace(string(body)), nil
}
// BugReport logs and returns a log marker that can be shared by the user with support.
//
// This is the same as calling BugReportWithOpts and only specifying the Note
// field.
func (lc *LocalClient) BugReport(ctx context.Context, note string) (string, error) {
return lc.BugReportWithOpts(ctx, BugReportOpts{Note: note})
}
// DebugAction invokes a debug action, such as "rebind" or "restun".
// These are development tools and subject to change or removal over time.
func (lc *LocalClient) DebugAction(ctx context.Context, action string) error {
body, err := lc.send(ctx, "POST", "/localapi/v0/debug?action="+url.QueryEscape(action), 200, nil)
if err != nil {
return fmt.Errorf("error %w: %s", err, body)
}
return nil
}
// DebugResultJSON invokes a debug action and returns its result as something JSON-able.
// These are development tools and subject to change or removal over time.
func (lc *LocalClient) DebugResultJSON(ctx context.Context, action string) (any, error) {
body, err := lc.send(ctx, "POST", "/localapi/v0/debug?action="+url.QueryEscape(action), 200, nil)
if err != nil {
return nil, fmt.Errorf("error %w: %s", err, body)
}
var x any
if err := json.Unmarshal(body, &x); err != nil {
return nil, err
}
return x, nil
}
// DebugPortmapOpts contains options for the DebugPortmap command.
type DebugPortmapOpts struct {
// Duration is how long the mapping should be created for. It defaults
// to 5 seconds if not set.
Duration time.Duration
// Type is the kind of portmap to debug. The empty string instructs the
// portmap client to perform all known types. Other valid options are
// "pmp", "pcp", and "upnp".
Type string
// GatewayAddr specifies the gateway address used during portmapping.
// If set, SelfAddr must also be set. If unset, it will be
// autodetected.
GatewayAddr netip.Addr
// SelfAddr specifies the gateway address used during portmapping. If
// set, GatewayAddr must also be set. If unset, it will be
// autodetected.
SelfAddr netip.Addr
// LogHTTP instructs the debug-portmap endpoint to print all HTTP
// requests and responses made to the logs.
LogHTTP bool
}
// DebugPortmap invokes the debug-portmap endpoint, and returns an
// io.ReadCloser that can be used to read the logs that are printed during this
// process.
//
// opts can be nil; if so, default values will be used.
func (lc *LocalClient) DebugPortmap(ctx context.Context, opts *DebugPortmapOpts) (io.ReadCloser, error) {
vals := make(url.Values)
if opts == nil {
opts = &DebugPortmapOpts{}
}
vals.Set("duration", cmp.Or(opts.Duration, 5*time.Second).String())
vals.Set("type", opts.Type)
vals.Set("log_http", strconv.FormatBool(opts.LogHTTP))
if opts.GatewayAddr.IsValid() != opts.SelfAddr.IsValid() {
return nil, fmt.Errorf("both GatewayAddr and SelfAddr must be provided if one is")
} else if opts.GatewayAddr.IsValid() {
vals.Set("gateway_and_self", fmt.Sprintf("%s/%s", opts.GatewayAddr, opts.SelfAddr))
}
req, err := http.NewRequestWithContext(ctx, "GET", "http://"+apitype.LocalAPIHost+"/localapi/v0/debug-portmap?"+vals.Encode(), nil)
if err != nil {
return nil, err
}
res, err := lc.doLocalRequestNiceError(req)
if err != nil {
return nil, err
}
if res.StatusCode != 200 {
body, _ := io.ReadAll(res.Body)
res.Body.Close()
return nil, fmt.Errorf("HTTP %s: %s", res.Status, body)
}
return res.Body, nil
}
// SetDevStoreKeyValue set a statestore key/value. It's only meant for development.
// The schema (including when keys are re-read) is not a stable interface.
func (lc *LocalClient) SetDevStoreKeyValue(ctx context.Context, key, value string) error {
body, err := lc.send(ctx, "POST", "/localapi/v0/dev-set-state-store?"+(url.Values{
"key": {key},
"value": {value},
}).Encode(), 200, nil)
if err != nil {
return fmt.Errorf("error %w: %s", err, body)
}
return nil
}
// SetComponentDebugLogging sets component's debug logging enabled for
// the provided duration. If the duration is in the past, the debug logging
// is disabled.
func (lc *LocalClient) SetComponentDebugLogging(ctx context.Context, component string, d time.Duration) error {
body, err := lc.send(ctx, "POST",
fmt.Sprintf("/localapi/v0/component-debug-logging?component=%s&secs=%d",
url.QueryEscape(component), int64(d.Seconds())), 200, nil)
if err != nil {
return fmt.Errorf("error %w: %s", err, body)
}
var res struct {
Error string
}
if err := json.Unmarshal(body, &res); err != nil {
return err
}
if res.Error != "" {
return errors.New(res.Error)
}
return nil
}
// Status returns the Tailscale daemon's status.
func Status(ctx context.Context) (*ipnstate.Status, error) {
return defaultLocalClient.Status(ctx)
}
// Status returns the Tailscale daemon's status.
func (lc *LocalClient) Status(ctx context.Context) (*ipnstate.Status, error) {
return lc.status(ctx, "")
}
// StatusWithoutPeers returns the Tailscale daemon's status, without the peer info.
func StatusWithoutPeers(ctx context.Context) (*ipnstate.Status, error) {
return defaultLocalClient.StatusWithoutPeers(ctx)
}
// StatusWithoutPeers returns the Tailscale daemon's status, without the peer info.
func (lc *LocalClient) StatusWithoutPeers(ctx context.Context) (*ipnstate.Status, error) {
return lc.status(ctx, "?peers=false")
}
func (lc *LocalClient) status(ctx context.Context, queryString string) (*ipnstate.Status, error) {
body, err := lc.get200(ctx, "/localapi/v0/status"+queryString)
if err != nil {
return nil, err
}
return decodeJSON[*ipnstate.Status](body)
}
// IDToken is a request to get an OIDC ID token for an audience.
// The token can be presented to any resource provider which offers OIDC
// Federation.
func (lc *LocalClient) IDToken(ctx context.Context, aud string) (*tailcfg.TokenResponse, error) {
body, err := lc.get200(ctx, "/localapi/v0/id-token?aud="+url.QueryEscape(aud))
if err != nil {
return nil, err
}
return decodeJSON[*tailcfg.TokenResponse](body)
}
// WaitingFiles returns the list of received Taildrop files that have been
// received by the Tailscale daemon in its staging/cache directory but not yet
// transferred by the user's CLI or GUI client and written to a user's home
// directory somewhere.
func (lc *LocalClient) WaitingFiles(ctx context.Context) ([]apitype.WaitingFile, error) {
return lc.AwaitWaitingFiles(ctx, 0)
}
// AwaitWaitingFiles is like WaitingFiles but takes a duration to await for an answer.
// If the duration is 0, it will return immediately. The duration is respected at second
// granularity only. If no files are available, it returns (nil, nil).
func (lc *LocalClient) AwaitWaitingFiles(ctx context.Context, d time.Duration) ([]apitype.WaitingFile, error) {
path := "/localapi/v0/files/?waitsec=" + fmt.Sprint(int(d.Seconds()))
body, err := lc.get200(ctx, path)
if err != nil {
return nil, err
}
return decodeJSON[[]apitype.WaitingFile](body)
}
func (lc *LocalClient) DeleteWaitingFile(ctx context.Context, baseName string) error {
_, err := lc.send(ctx, "DELETE", "/localapi/v0/files/"+url.PathEscape(baseName), http.StatusNoContent, nil)
return err
}
func (lc *LocalClient) GetWaitingFile(ctx context.Context, baseName string) (rc io.ReadCloser, size int64, err error) {
req, err := http.NewRequestWithContext(ctx, "GET", "http://"+apitype.LocalAPIHost+"/localapi/v0/files/"+url.PathEscape(baseName), nil)
if err != nil {
return nil, 0, err
}
res, err := lc.doLocalRequestNiceError(req)
if err != nil {
return nil, 0, err
}
if res.ContentLength == -1 {
res.Body.Close()
return nil, 0, fmt.Errorf("unexpected chunking")
}
if res.StatusCode != 200 {
body, _ := io.ReadAll(res.Body)
res.Body.Close()
return nil, 0, fmt.Errorf("HTTP %s: %s", res.Status, body)
}
return res.Body, res.ContentLength, nil
}
func (lc *LocalClient) FileTargets(ctx context.Context) ([]apitype.FileTarget, error) {
body, err := lc.get200(ctx, "/localapi/v0/file-targets")
if err != nil {
return nil, err
}
return decodeJSON[[]apitype.FileTarget](body)
}
// PushFile sends Taildrop file r to target.
//
// A size of -1 means unknown.
// The name parameter is the original filename, not escaped.
func (lc *LocalClient) PushFile(ctx context.Context, target tailcfg.StableNodeID, size int64, name string, r io.Reader) error {
req, err := http.NewRequestWithContext(ctx, "PUT", "http://"+apitype.LocalAPIHost+"/localapi/v0/file-put/"+string(target)+"/"+url.PathEscape(name), r)
if err != nil {
return err
}
if size != -1 {
req.ContentLength = size
}
res, err := lc.doLocalRequestNiceError(req)
if err != nil {
return err
}
if res.StatusCode == 200 {
io.Copy(io.Discard, res.Body)
return nil
}
all, _ := io.ReadAll(res.Body)
return bestError(fmt.Errorf("%s: %s", res.Status, all), all)
}
// CheckIPForwarding asks the local Tailscale daemon whether it looks like the
// machine is properly configured to forward IP packets as a subnet router
// or exit node.
func (lc *LocalClient) CheckIPForwarding(ctx context.Context) error {
body, err := lc.get200(ctx, "/localapi/v0/check-ip-forwarding")
if err != nil {
return err
}
var jres struct {
Warning string
}
if err := json.Unmarshal(body, &jres); err != nil {
return fmt.Errorf("invalid JSON from check-ip-forwarding: %w", err)
}
if jres.Warning != "" {
return errors.New(jres.Warning)
}
return nil
}
// CheckUDPGROForwarding asks the local Tailscale daemon whether it looks like
// the machine is optimally configured to forward UDP packets as a subnet router
// or exit node.
func (lc *LocalClient) CheckUDPGROForwarding(ctx context.Context) error {
body, err := lc.get200(ctx, "/localapi/v0/check-udp-gro-forwarding")
if err != nil {
return err
}
var jres struct {
Warning string
}
if err := json.Unmarshal(body, &jres); err != nil {
return fmt.Errorf("invalid JSON from check-udp-gro-forwarding: %w", err)
}
if jres.Warning != "" {
return errors.New(jres.Warning)
}
return nil
}
// CheckPrefs validates the provided preferences, without making any changes.
//
// The CLI uses this before a Start call to fail fast if the preferences won't
// work. Currently (2022-04-18) this only checks for SSH server compatibility.
// Note that EditPrefs does the same validation as this, so call CheckPrefs before
// EditPrefs is not necessary.
func (lc *LocalClient) CheckPrefs(ctx context.Context, p *ipn.Prefs) error {
_, err := lc.send(ctx, "POST", "/localapi/v0/check-prefs", http.StatusOK, jsonBody(p))
return err
}
func (lc *LocalClient) GetPrefs(ctx context.Context) (*ipn.Prefs, error) {
body, err := lc.get200(ctx, "/localapi/v0/prefs")
if err != nil {
return nil, err
}
var p ipn.Prefs
if err := json.Unmarshal(body, &p); err != nil {
return nil, fmt.Errorf("invalid prefs JSON: %w", err)
}
return &p, nil
}
func (lc *LocalClient) EditPrefs(ctx context.Context, mp *ipn.MaskedPrefs) (*ipn.Prefs, error) {
body, err := lc.send(ctx, "PATCH", "/localapi/v0/prefs", http.StatusOK, jsonBody(mp))
if err != nil {
return nil, err
}
return decodeJSON[*ipn.Prefs](body)
}
// StartLoginInteractive starts an interactive login.
func (lc *LocalClient) StartLoginInteractive(ctx context.Context) error {
_, err := lc.send(ctx, "POST", "/localapi/v0/login-interactive", http.StatusNoContent, nil)
return err
}
// Start applies the configuration specified in opts, and starts the
// state machine.
func (lc *LocalClient) Start(ctx context.Context, opts ipn.Options) error {
_, err := lc.send(ctx, "POST", "/localapi/v0/start", http.StatusNoContent, jsonBody(opts))
return err
}
// Logout logs out the current node.
func (lc *LocalClient) Logout(ctx context.Context) error {
_, err := lc.send(ctx, "POST", "/localapi/v0/logout", http.StatusNoContent, nil)
return err
}
// SetDNS adds a DNS TXT record for the given domain name, containing
// the provided TXT value. The intended use case is answering
// LetsEncrypt/ACME dns-01 challenges.
//
// The control plane will only permit SetDNS requests with very
// specific names and values. The name should be
// "_acme-challenge." + your node's MagicDNS name. It's expected that
// clients cache the certs from LetsEncrypt (or whichever CA is
// providing them) and only request new ones as needed; the control plane
// rate limits SetDNS requests.
//
// This is a low-level interface; it's expected that most Tailscale
// users use a higher level interface to getting/using TLS
// certificates.
func (lc *LocalClient) SetDNS(ctx context.Context, name, value string) error {
v := url.Values{}
v.Set("name", name)
v.Set("value", value)
_, err := lc.send(ctx, "POST", "/localapi/v0/set-dns?"+v.Encode(), 200, nil)
return err
}
// DialTCP connects to the host's port via Tailscale.
//
// The host may be a base DNS name (resolved from the netmap inside
// tailscaled), a FQDN, or an IP address.
//
// The ctx is only used for the duration of the call, not the lifetime of the net.Conn.
func (lc *LocalClient) DialTCP(ctx context.Context, host string, port uint16) (net.Conn, error) {
connCh := make(chan net.Conn, 1)
trace := httptrace.ClientTrace{
GotConn: func(info httptrace.GotConnInfo) {
connCh <- info.Conn
},
}
ctx = httptrace.WithClientTrace(ctx, &trace)
req, err := http.NewRequestWithContext(ctx, "POST", "http://"+apitype.LocalAPIHost+"/localapi/v0/dial", nil)
if err != nil {
return nil, err
}
req.Header = http.Header{
"Upgrade": []string{"ts-dial"},
"Connection": []string{"upgrade"},
"Dial-Host": []string{host},
"Dial-Port": []string{fmt.Sprint(port)},
}
res, err := lc.DoLocalRequest(req)
if err != nil {
return nil, err
}
if res.StatusCode != http.StatusSwitchingProtocols {
body, _ := io.ReadAll(res.Body)
res.Body.Close()
return nil, fmt.Errorf("unexpected HTTP response: %s, %s", res.Status, body)
}
// From here on, the underlying net.Conn is ours to use, but there
// is still a read buffer attached to it within resp.Body. So, we
// must direct I/O through resp.Body, but we can still use the
// underlying net.Conn for stuff like deadlines.
var switchedConn net.Conn
select {
case switchedConn = <-connCh:
default:
}
if switchedConn == nil {
res.Body.Close()
return nil, fmt.Errorf("httptrace didn't provide a connection")
}
rwc, ok := res.Body.(io.ReadWriteCloser)
if !ok {
res.Body.Close()
return nil, errors.New("http Transport did not provide a writable body")
}
return netutil.NewAltReadWriteCloserConn(rwc, switchedConn), nil
}
// CurrentDERPMap returns the current DERPMap that is being used by the local tailscaled.
// It is intended to be used with netcheck to see availability of DERPs.
func (lc *LocalClient) CurrentDERPMap(ctx context.Context) (*tailcfg.DERPMap, error) {
var derpMap tailcfg.DERPMap
res, err := lc.send(ctx, "GET", "/localapi/v0/derpmap", 200, nil)
if err != nil {
return nil, err
}
if err = json.Unmarshal(res, &derpMap); err != nil {
return nil, fmt.Errorf("invalid derp map json: %w", err)
}
return &derpMap, nil
}
// CertPair returns a cert and private key for the provided DNS domain.
//
// It returns a cached certificate from disk if it's still valid.
//
// Deprecated: use LocalClient.CertPair.
func CertPair(ctx context.Context, domain string) (certPEM, keyPEM []byte, err error) {
return defaultLocalClient.CertPair(ctx, domain)
}
// CertPair returns a cert and private key for the provided DNS domain.
//
// It returns a cached certificate from disk if it's still valid.
//
// API maturity: this is considered a stable API.
func (lc *LocalClient) CertPair(ctx context.Context, domain string) (certPEM, keyPEM []byte, err error) {
res, err := lc.send(ctx, "GET", "/localapi/v0/cert/"+domain+"?type=pair", 200, nil)
if err != nil {
return nil, nil, err
}
// with ?type=pair, the response PEM is first the one private
// key PEM block, then the cert PEM blocks.
i := mem.Index(mem.B(res), mem.S("--\n--"))
if i == -1 {
return nil, nil, fmt.Errorf("unexpected output: no delimiter")
}
i += len("--\n")
keyPEM, certPEM = res[:i], res[i:]
if mem.Contains(mem.B(certPEM), mem.S(" PRIVATE KEY-----")) {
return nil, nil, fmt.Errorf("unexpected output: key in cert")
}
return certPEM, keyPEM, nil
}
// GetCertificate fetches a TLS certificate for the TLS ClientHello in hi.
//
// It returns a cached certificate from disk if it's still valid.
//
// It's the right signature to use as the value of
// tls.Config.GetCertificate.
//
// Deprecated: use LocalClient.GetCertificate.
func GetCertificate(hi *tls.ClientHelloInfo) (*tls.Certificate, error) {
return defaultLocalClient.GetCertificate(hi)
}
// GetCertificate fetches a TLS certificate for the TLS ClientHello in hi.
//
// It returns a cached certificate from disk if it's still valid.
//
// It's the right signature to use as the value of
// tls.Config.GetCertificate.
//
// API maturity: this is considered a stable API.
func (lc *LocalClient) GetCertificate(hi *tls.ClientHelloInfo) (*tls.Certificate, error) {
if hi == nil || hi.ServerName == "" {
return nil, errors.New("no SNI ServerName")
}
ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
defer cancel()
name := hi.ServerName
if !strings.Contains(name, ".") {
if v, ok := lc.ExpandSNIName(ctx, name); ok {
name = v
}
}
certPEM, keyPEM, err := lc.CertPair(ctx, name)
if err != nil {
return nil, err
}
cert, err := tls.X509KeyPair(certPEM, keyPEM)
if err != nil {
return nil, err
}
return &cert, nil
}
// ExpandSNIName expands bare label name into the most likely actual TLS cert name.
//
// Deprecated: use LocalClient.ExpandSNIName.
func ExpandSNIName(ctx context.Context, name string) (fqdn string, ok bool) {
return defaultLocalClient.ExpandSNIName(ctx, name)
}
// ExpandSNIName expands bare label name into the most likely actual TLS cert name.
func (lc *LocalClient) ExpandSNIName(ctx context.Context, name string) (fqdn string, ok bool) {
st, err := lc.StatusWithoutPeers(ctx)
if err != nil {
return "", false
}
for _, d := range st.CertDomains {
if len(d) > len(name)+1 && strings.HasPrefix(d, name) && d[len(name)] == '.' {
return d, true
}
}
return "", false
}
// PingOpts contains options for the ping request.
//
// The zero value is valid, which means to use defaults.
type PingOpts struct {
// Size is the length of the ping message in bytes. It's ignored if it's
// smaller than the minimum message size.
//
// For disco pings, it specifies the length of the packet's payload. That
// is, it includes the disco headers and message, but not the IP and UDP
// headers.
Size int
}
// Ping sends a ping of the provided type to the provided IP and waits
// for its response. The opts type specifies additional options.
func (lc *LocalClient) PingWithOpts(ctx context.Context, ip netip.Addr, pingtype tailcfg.PingType, opts PingOpts) (*ipnstate.PingResult, error) {
v := url.Values{}
v.Set("ip", ip.String())
v.Set("size", strconv.Itoa(opts.Size))
v.Set("type", string(pingtype))
body, err := lc.send(ctx, "POST", "/localapi/v0/ping?"+v.Encode(), 200, nil)
if err != nil {
return nil, fmt.Errorf("error %w: %s", err, body)
}
return decodeJSON[*ipnstate.PingResult](body)
}
// Ping sends a ping of the provided type to the provided IP and waits
// for its response.
func (lc *LocalClient) Ping(ctx context.Context, ip netip.Addr, pingtype tailcfg.PingType) (*ipnstate.PingResult, error) {
return lc.PingWithOpts(ctx, ip, pingtype, PingOpts{})
}
// NetworkLockStatus fetches information about the tailnet key authority, if one is configured.
func (lc *LocalClient) NetworkLockStatus(ctx context.Context) (*ipnstate.NetworkLockStatus, error) {
body, err := lc.send(ctx, "GET", "/localapi/v0/tka/status", 200, nil)
if err != nil {
return nil, fmt.Errorf("error: %w", err)
}
return decodeJSON[*ipnstate.NetworkLockStatus](body)
}
// NetworkLockInit initializes the tailnet key authority.
//
// TODO(tom): Plumb through disablement secrets.
func (lc *LocalClient) NetworkLockInit(ctx context.Context, keys []tka.Key, disablementValues [][]byte, supportDisablement []byte) (*ipnstate.NetworkLockStatus, error) {
var b bytes.Buffer
type initRequest struct {
Keys []tka.Key
DisablementValues [][]byte
SupportDisablement []byte
}
if err := json.NewEncoder(&b).Encode(initRequest{Keys: keys, DisablementValues: disablementValues, SupportDisablement: supportDisablement}); err != nil {
return nil, err
}
body, err := lc.send(ctx, "POST", "/localapi/v0/tka/init", 200, &b)
if err != nil {
return nil, fmt.Errorf("error: %w", err)
}