tailscale/ipn/localapi/localapi.go

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// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
// Package localapi contains the HTTP server handlers for tailscaled's API server.
package localapi
import (
"bytes"
"context"
"crypto/sha256"
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"io"
"net"
"net/http"
"net/http/httputil"
"net/netip"
"net/url"
"os"
"os/exec"
"path"
"runtime"
"slices"
"strconv"
"strings"
"sync"
"time"
"tailscale.com/client/tailscale/apitype"
"tailscale.com/clientupdate"
"tailscale.com/envknob"
"tailscale.com/health"
"tailscale.com/hostinfo"
"tailscale.com/ipn"
"tailscale.com/ipn/ipnauth"
"tailscale.com/ipn/ipnlocal"
"tailscale.com/ipn/ipnstate"
"tailscale.com/logtail"
"tailscale.com/net/netmon"
"tailscale.com/net/netutil"
"tailscale.com/net/portmapper"
"tailscale.com/tailcfg"
"tailscale.com/taildrop"
"tailscale.com/tailfs"
"tailscale.com/tka"
"tailscale.com/tstime"
"tailscale.com/types/key"
"tailscale.com/types/logger"
"tailscale.com/types/logid"
"tailscale.com/types/ptr"
"tailscale.com/types/tkatype"
"tailscale.com/util/clientmetric"
"tailscale.com/util/httphdr"
"tailscale.com/util/httpm"
"tailscale.com/util/mak"
"tailscale.com/util/osdiag"
"tailscale.com/util/osuser"
"tailscale.com/util/rands"
"tailscale.com/version"
"tailscale.com/wgengine/magicsock"
)
type localAPIHandler func(*Handler, http.ResponseWriter, *http.Request)
// handler is the set of LocalAPI handlers, keyed by the part of the
// Request.URL.Path after "/localapi/v0/". If the key ends with a trailing slash
// then it's a prefix match.
var handler = map[string]localAPIHandler{
// The prefix match handlers end with a slash:
"cert/": (*Handler).serveCert,
"file-put/": (*Handler).serveFilePut,
"files/": (*Handler).serveFiles,
"profiles/": (*Handler).serveProfiles,
// The other /localapi/v0/NAME handlers are exact matches and contain only NAME
// without a trailing slash:
"bugreport": (*Handler).serveBugReport,
"check-ip-forwarding": (*Handler).serveCheckIPForwarding,
"check-udp-gro-forwarding": (*Handler).serveCheckUDPGROForwarding,
"check-prefs": (*Handler).serveCheckPrefs,
"component-debug-logging": (*Handler).serveComponentDebugLogging,
"debug": (*Handler).serveDebug,
"debug-derp-region": (*Handler).serveDebugDERPRegion,
"debug-dial-types": (*Handler).serveDebugDialTypes,
"debug-packet-filter-matches": (*Handler).serveDebugPacketFilterMatches,
"debug-packet-filter-rules": (*Handler).serveDebugPacketFilterRules,
"debug-portmap": (*Handler).serveDebugPortmap,
"debug-peer-endpoint-changes": (*Handler).serveDebugPeerEndpointChanges,
"debug-capture": (*Handler).serveDebugCapture,
"debug-log": (*Handler).serveDebugLog,
"derpmap": (*Handler).serveDERPMap,
"dev-set-state-store": (*Handler).serveDevSetStateStore,
"set-push-device-token": (*Handler).serveSetPushDeviceToken,
"handle-push-message": (*Handler).serveHandlePushMessage,
"dial": (*Handler).serveDial,
"file-targets": (*Handler).serveFileTargets,
"goroutines": (*Handler).serveGoroutines,
"id-token": (*Handler).serveIDToken,
"login-interactive": (*Handler).serveLoginInteractive,
"logout": (*Handler).serveLogout,
"logtap": (*Handler).serveLogTap,
"metrics": (*Handler).serveMetrics,
"ping": (*Handler).servePing,
"prefs": (*Handler).servePrefs,
"pprof": (*Handler).servePprof,
"reload-config": (*Handler).reloadConfig,
"reset-auth": (*Handler).serveResetAuth,
"serve-config": (*Handler).serveServeConfig,
"set-dns": (*Handler).serveSetDNS,
"set-expiry-sooner": (*Handler).serveSetExpirySooner,
"set-gui-visible": (*Handler).serveSetGUIVisible,
"tailfs/fileserver-address": (*Handler).serveTailFSFileServerAddr,
"tailfs/shares": (*Handler).serveShares,
"start": (*Handler).serveStart,
"status": (*Handler).serveStatus,
"tka/init": (*Handler).serveTKAInit,
"tka/log": (*Handler).serveTKALog,
"tka/modify": (*Handler).serveTKAModify,
"tka/sign": (*Handler).serveTKASign,
"tka/status": (*Handler).serveTKAStatus,
"tka/disable": (*Handler).serveTKADisable,
"tka/force-local-disable": (*Handler).serveTKALocalDisable,
"tka/affected-sigs": (*Handler).serveTKAAffectedSigs,
"tka/wrap-preauth-key": (*Handler).serveTKAWrapPreauthKey,
"tka/verify-deeplink": (*Handler).serveTKAVerifySigningDeeplink,
"tka/generate-recovery-aum": (*Handler).serveTKAGenerateRecoveryAUM,
"tka/cosign-recovery-aum": (*Handler).serveTKACosignRecoveryAUM,
"tka/submit-recovery-aum": (*Handler).serveTKASubmitRecoveryAUM,
"upload-client-metrics": (*Handler).serveUploadClientMetrics,
"watch-ipn-bus": (*Handler).serveWatchIPNBus,
"whois": (*Handler).serveWhoIs,
"query-feature": (*Handler).serveQueryFeature,
"update/check": (*Handler).serveUpdateCheck,
"update/install": (*Handler).serveUpdateInstall,
"update/progress": (*Handler).serveUpdateProgress,
}
var (
// The clientmetrics package is stateful, but we want to expose a simple
// imperative API to local clients, so we need to keep track of
// clientmetric.Metric instances that we've created for them. These need to
// be globals because we end up creating many Handler instances for the
// lifetime of a client.
metricsMu sync.Mutex
metrics = map[string]*clientmetric.Metric{}
)
// NewHandler creates a new LocalAPI HTTP handler. All parameters except netMon
// are required (if non-nil it's used to do faster interface lookups).
func NewHandler(b *ipnlocal.LocalBackend, logf logger.Logf, netMon *netmon.Monitor, logID logid.PublicID) *Handler {
return &Handler{b: b, logf: logf, netMon: netMon, backendLogID: logID, clock: tstime.StdClock{}}
}
type Handler struct {
// RequiredPassword, if non-empty, forces all HTTP
// requests to have HTTP basic auth with this password.
// It's used by the sandboxed macOS sameuserproof GUI auth mechanism.
RequiredPassword string
// PermitRead is whether read-only HTTP handlers are allowed.
PermitRead bool
// PermitWrite is whether mutating HTTP handlers are allowed.
// If PermitWrite is true, everything is allowed.
// It effectively means that the user is root or the admin
// (operator user).
PermitWrite bool
// PermitCert is whether the client is additionally granted
// cert fetching access.
PermitCert bool
// ConnIdentity is the identity of the client connected to the Handler.
ConnIdentity *ipnauth.ConnIdentity
// Test-only override for connIsLocalAdmin method. If non-nil,
// connIsLocalAdmin returns this value.
testConnIsLocalAdmin *bool
b *ipnlocal.LocalBackend
logf logger.Logf
netMon *netmon.Monitor // optional; nil means interfaces will be looked up on-demand
backendLogID logid.PublicID
clock tstime.Clock
}
func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if h.b == nil {
http.Error(w, "server has no local backend", http.StatusInternalServerError)
return
}
if r.Referer() != "" || r.Header.Get("Origin") != "" || !h.validHost(r.Host) {
metricInvalidRequests.Add(1)
http.Error(w, "invalid localapi request", http.StatusForbidden)
return
}
w.Header().Set("Tailscale-Version", version.Long())
w.Header().Set("Tailscale-Cap", strconv.Itoa(int(tailcfg.CurrentCapabilityVersion)))
w.Header().Set("Content-Security-Policy", `default-src 'none'; frame-ancestors 'none'; script-src 'none'; script-src-elem 'none'; script-src-attr 'none'`)
w.Header().Set("X-Frame-Options", "DENY")
w.Header().Set("X-Content-Type-Options", "nosniff")
if h.RequiredPassword != "" {
_, pass, ok := r.BasicAuth()
if !ok {
metricInvalidRequests.Add(1)
http.Error(w, "auth required", http.StatusUnauthorized)
return
}
if pass != h.RequiredPassword {
metricInvalidRequests.Add(1)
http.Error(w, "bad password", http.StatusForbidden)
return
}
}
if fn, ok := handlerForPath(r.URL.Path); ok {
fn(h, w, r)
} else {
http.NotFound(w, r)
}
}
// validLocalHostForTesting allows loopback handlers without RequiredPassword for testing.
var validLocalHostForTesting = false
// validHost reports whether h is a valid Host header value for a LocalAPI request.
func (h *Handler) validHost(hostname string) bool {
// The client code sends a hostname of "local-tailscaled.sock".
switch hostname {
case "", apitype.LocalAPIHost:
return true
}
if !validLocalHostForTesting && h.RequiredPassword == "" {
return false // only allow localhost with basic auth or in tests
}
host, _, err := net.SplitHostPort(hostname)
if err != nil {
return false
}
if host == "localhost" {
return true
}
addr, err := netip.ParseAddr(host)
if err != nil {
return false
}
return addr.IsLoopback()
}
// handlerForPath returns the LocalAPI handler for the provided Request.URI.Path.
// (the path doesn't include any query parameters)
func handlerForPath(urlPath string) (h localAPIHandler, ok bool) {
if urlPath == "/" {
return (*Handler).serveLocalAPIRoot, true
}
suff, ok := strings.CutPrefix(urlPath, "/localapi/v0/")
if !ok {
// Currently all LocalAPI methods start with "/localapi/v0/" to signal
// to people that they're not necessarily stable APIs. In practice we'll
// probably need to keep them pretty stable anyway, but for now treat
// them as an internal implementation detail.
return nil, false
}
if fn, ok := handler[suff]; ok {
// Here we match exact handler suffixes like "status" or ones with a
// slash already in their name, like "tka/status".
return fn, true
}
// Otherwise, it might be a prefix match like "files/*" which we look up
// by the prefix including first trailing slash.
if i := strings.IndexByte(suff, '/'); i != -1 {
suff = suff[:i+1]
if fn, ok := handler[suff]; ok {
return fn, true
}
}
return nil, false
}
func (*Handler) serveLocalAPIRoot(w http.ResponseWriter, r *http.Request) {
io.WriteString(w, "tailscaled\n")
}
// serveIDToken handles requests to get an OIDC ID token.
func (h *Handler) serveIDToken(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "id-token access denied", http.StatusForbidden)
return
}
nm := h.b.NetMap()
if nm == nil {
http.Error(w, "no netmap", http.StatusServiceUnavailable)
return
}
aud := strings.TrimSpace(r.FormValue("aud"))
if len(aud) == 0 {
http.Error(w, "no audience requested", http.StatusBadRequest)
return
}
req := &tailcfg.TokenRequest{
CapVersion: tailcfg.CurrentCapabilityVersion,
Audience: aud,
NodeKey: nm.NodeKey,
}
b, err := json.Marshal(req)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
httpReq, err := http.NewRequest("POST", "https://unused/machine/id-token", bytes.NewReader(b))
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
resp, err := h.b.DoNoiseRequest(httpReq)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
defer resp.Body.Close()
w.WriteHeader(resp.StatusCode)
if _, err := io.Copy(w, resp.Body); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
}
func (h *Handler) serveBugReport(w http.ResponseWriter, r *http.Request) {
if !h.PermitRead {
http.Error(w, "bugreport access denied", http.StatusForbidden)
return
}
if r.Method != "POST" {
http.Error(w, "only POST allowed", http.StatusMethodNotAllowed)
return
}
defer h.b.TryFlushLogs() // kick off upload after bugreport's done logging
logMarker := func() string {
return fmt.Sprintf("BUG-%v-%v-%v", h.backendLogID, h.clock.Now().UTC().Format("20060102150405Z"), rands.HexString(16))
}
if envknob.NoLogsNoSupport() {
logMarker = func() string { return "BUG-NO-LOGS-NO-SUPPORT-this-node-has-had-its-logging-disabled" }
}
startMarker := logMarker()
h.logf("user bugreport: %s", startMarker)
if note := r.URL.Query().Get("note"); len(note) > 0 {
h.logf("user bugreport note: %s", note)
}
hi, _ := json.Marshal(hostinfo.New())
h.logf("user bugreport hostinfo: %s", hi)
if err := health.OverallError(); err != nil {
h.logf("user bugreport health: %s", err.Error())
} else {
h.logf("user bugreport health: ok")
}
// Information about the current node from the netmap
if nm := h.b.NetMap(); nm != nil {
if self := nm.SelfNode; self.Valid() {
h.logf("user bugreport node info: nodeid=%q stableid=%q expiry=%q", self.ID(), self.StableID(), self.KeyExpiry().Format(time.RFC3339))
}
h.logf("user bugreport public keys: machine=%q node=%q", nm.MachineKey, nm.NodeKey)
} else {
h.logf("user bugreport netmap: no active netmap")
}
// Print all envknobs; we otherwise only print these on startup, and
// printing them here ensures we don't have to go spelunking through
// logs for them.
envknob.LogCurrent(logger.WithPrefix(h.logf, "user bugreport: "))
// OS-specific details
osdiag.LogSupportInfo(logger.WithPrefix(h.logf, "user bugreport OS: "), osdiag.LogSupportInfoReasonBugReport)
if defBool(r.URL.Query().Get("diagnose"), false) {
h.b.Doctor(r.Context(), logger.WithPrefix(h.logf, "diag: "))
}
w.Header().Set("Content-Type", "text/plain")
fmt.Fprintln(w, startMarker)
// Nothing else to do if we're not in record mode; we wrote the marker
// above, so we can just finish our response now.
if !defBool(r.URL.Query().Get("record"), false) {
return
}
until := h.clock.Now().Add(12 * time.Hour)
var changed map[string]bool
for _, component := range []string{"magicsock"} {
if h.b.GetComponentDebugLogging(component).IsZero() {
if err := h.b.SetComponentDebugLogging(component, until); err != nil {
h.logf("bugreport: error setting component %q logging: %v", component, err)
continue
}
mak.Set(&changed, component, true)
}
}
defer func() {
for component := range changed {
h.b.SetComponentDebugLogging(component, time.Time{})
}
}()
// NOTE(andrew): if we have anything else we want to do while recording
// a bugreport, we can add it here.
// Read from the client; this will also return when the client closes
// the connection.
var buf [1]byte
_, err := r.Body.Read(buf[:])
switch {
case err == nil:
// good
case errors.Is(err, io.EOF):
// good
case errors.Is(err, io.ErrUnexpectedEOF):
// this happens when Ctrl-C'ing the tailscale client; don't
// bother logging an error
default:
// Log but continue anyway.
h.logf("user bugreport: error reading body: %v", err)
}
// Generate another log marker and return it to the client.
endMarker := logMarker()
h.logf("user bugreport end: %s", endMarker)
fmt.Fprintln(w, endMarker)
}
func (h *Handler) serveWhoIs(w http.ResponseWriter, r *http.Request) {
h.serveWhoIsWithBackend(w, r, h.b)
}
// localBackendWhoIsMethods is the subset of ipn.LocalBackend as needed
// by the localapi WhoIs method.
type localBackendWhoIsMethods interface {
WhoIs(netip.AddrPort) (n tailcfg.NodeView, u tailcfg.UserProfile, ok bool)
PeerCaps(netip.Addr) tailcfg.PeerCapMap
}
func (h *Handler) serveWhoIsWithBackend(w http.ResponseWriter, r *http.Request, b localBackendWhoIsMethods) {
if !h.PermitRead {
http.Error(w, "whois access denied", http.StatusForbidden)
return
}
var ipp netip.AddrPort
if v := r.FormValue("addr"); v != "" {
if ip, err := netip.ParseAddr(v); err == nil {
ipp = netip.AddrPortFrom(ip, 0)
} else {
var err error
ipp, err = netip.ParseAddrPort(v)
if err != nil {
http.Error(w, "invalid 'addr' parameter", http.StatusBadRequest)
return
}
}
} else {
http.Error(w, "missing 'addr' parameter", http.StatusBadRequest)
return
}
n, u, ok := b.WhoIs(ipp)
if !ok {
http.Error(w, "no match for IP:port", http.StatusNotFound)
return
}
res := &apitype.WhoIsResponse{
Node: n.AsStruct(), // always non-nil per WhoIsResponse contract
UserProfile: &u, // always non-nil per WhoIsResponse contract
}
if n.Addresses().Len() > 0 {
res.CapMap = b.PeerCaps(n.Addresses().At(0).Addr())
}
j, err := json.MarshalIndent(res, "", "\t")
if err != nil {
http.Error(w, "JSON encoding error", http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.Write(j)
}
func (h *Handler) serveGoroutines(w http.ResponseWriter, r *http.Request) {
// Require write access out of paranoia that the goroutine dump
// (at least its arguments) might contain something sensitive.
if !h.PermitWrite {
http.Error(w, "goroutine dump access denied", http.StatusForbidden)
return
}
buf := make([]byte, 2<<20)
buf = buf[:runtime.Stack(buf, true)]
w.Header().Set("Content-Type", "text/plain")
w.Write(buf)
}
// serveLogTap taps into the tailscaled/logtail server output and streams
// it to the client.
func (h *Handler) serveLogTap(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
// Require write access (~root) as the logs could contain something
// sensitive.
if !h.PermitWrite {
http.Error(w, "logtap access denied", http.StatusForbidden)
return
}
if r.Method != "GET" {
http.Error(w, "GET required", http.StatusMethodNotAllowed)
return
}
f, ok := w.(http.Flusher)
if !ok {
http.Error(w, "streaming unsupported", http.StatusInternalServerError)
return
}
io.WriteString(w, `{"text":"[logtap connected]\n"}`+"\n")
f.Flush()
msgc := make(chan string, 16)
unreg := logtail.RegisterLogTap(msgc)
defer unreg()
for {
select {
case <-ctx.Done():
return
case msg := <-msgc:
io.WriteString(w, msg)
f.Flush()
}
}
}
func (h *Handler) serveMetrics(w http.ResponseWriter, r *http.Request) {
// Require write access out of paranoia that the metrics
// might contain something sensitive.
if !h.PermitWrite {
http.Error(w, "metric access denied", http.StatusForbidden)
return
}
w.Header().Set("Content-Type", "text/plain")
clientmetric.WritePrometheusExpositionFormat(w)
}
func (h *Handler) serveDebug(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "debug access denied", http.StatusForbidden)
return
}
if r.Method != "POST" {
http.Error(w, "POST required", http.StatusMethodNotAllowed)
return
}
// The action is normally in a POST form parameter, but
// some actions (like "notify") want a full JSON body, so
// permit some to have their action in a header.
var action string
switch v := r.Header.Get("Debug-Action"); v {
case "notify":
action = v
default:
action = r.FormValue("action")
}
var err error
switch action {
case "derp-set-homeless":
h.b.MagicConn().SetHomeless(true)
case "derp-unset-homeless":
h.b.MagicConn().SetHomeless(false)
case "rebind":
err = h.b.DebugRebind()
case "restun":
err = h.b.DebugReSTUN()
case "enginestatus":
// serveRequestEngineStatus kicks off a call to RequestEngineStatus (via
// LocalBackend => UserspaceEngine => LocalBackend =>
// ipn.Notify{Engine}).
//
// This is a temporary (2022-11-25) measure for the Windows client's
// move to the LocalAPI HTTP interface. It was polling this over the IPN
// bus before every 2 seconds which is wasteful. We should add a bit to
// WatchIPNMask instead to let an IPN bus watcher say that it's
// interested in that info and then only send it on demand, not via
// polling. But for now we keep this interface because that's what the
// client already did. A future change will remove this, so don't depend
// on it.
h.b.RequestEngineStatus()
case "notify":
var n ipn.Notify
err = json.NewDecoder(r.Body).Decode(&n)
if err != nil {
break
}
h.b.DebugNotify(n)
case "break-tcp-conns":
err = h.b.DebugBreakTCPConns()
case "break-derp-conns":
err = h.b.DebugBreakDERPConns()
case "force-netmap-update":
h.b.DebugForceNetmapUpdate()
case "control-knobs":
k := h.b.ControlKnobs()
w.Header().Set("Content-Type", "application/json")
err = json.NewEncoder(w).Encode(k.AsDebugJSON())
if err == nil {
return
}
case "pick-new-derp":
err = h.b.DebugPickNewDERP()
case "":
err = fmt.Errorf("missing parameter 'action'")
default:
err = fmt.Errorf("unknown action %q", action)
}
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
w.Header().Set("Content-Type", "text/plain")
io.WriteString(w, "done\n")
}
func (h *Handler) serveDevSetStateStore(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "debug access denied", http.StatusForbidden)
return
}
if r.Method != "POST" {
http.Error(w, "POST required", http.StatusMethodNotAllowed)
return
}
if err := h.b.SetDevStateStore(r.FormValue("key"), r.FormValue("value")); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "text/plain")
io.WriteString(w, "done\n")
}
func (h *Handler) serveDebugPacketFilterRules(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "debug access denied", http.StatusForbidden)
return
}
nm := h.b.NetMap()
if nm == nil {
http.Error(w, "no netmap", http.StatusNotFound)
return
}
w.Header().Set("Content-Type", "application/json")
enc := json.NewEncoder(w)
enc.SetIndent("", "\t")
enc.Encode(nm.PacketFilterRules)
}
func (h *Handler) serveDebugPacketFilterMatches(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "debug access denied", http.StatusForbidden)
return
}
nm := h.b.NetMap()
if nm == nil {
http.Error(w, "no netmap", http.StatusNotFound)
return
}
w.Header().Set("Content-Type", "application/json")
enc := json.NewEncoder(w)
enc.SetIndent("", "\t")
enc.Encode(nm.PacketFilter)
}
func (h *Handler) serveDebugPortmap(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "debug access denied", http.StatusForbidden)
return
}
w.Header().Set("Content-Type", "text/plain")
dur, err := time.ParseDuration(r.FormValue("duration"))
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
gwSelf := r.FormValue("gateway_and_self")
// Update portmapper debug flags
debugKnobs := &portmapper.DebugKnobs{VerboseLogs: true}
switch r.FormValue("type") {
case "":
case "pmp":
debugKnobs.DisablePCP = true
debugKnobs.DisableUPnP = true
case "pcp":
debugKnobs.DisablePMP = true
debugKnobs.DisableUPnP = true
case "upnp":
debugKnobs.DisablePCP = true
debugKnobs.DisablePMP = true
default:
http.Error(w, "unknown portmap debug type", http.StatusBadRequest)
return
}
if defBool(r.FormValue("log_http"), false) {
debugKnobs.LogHTTP = true
}
var (
logLock sync.Mutex
handlerDone bool
)
logf := func(format string, args ...any) {
if !strings.HasSuffix(format, "\n") {
format = format + "\n"
}
logLock.Lock()
defer logLock.Unlock()
// The portmapper can call this log function after the HTTP
// handler returns, which is not allowed and can cause a panic.
// If this happens, ignore the log lines since this typically
// occurs due to a client disconnect.
if handlerDone {
return
}
// Write and flush each line to the client so that output is streamed
fmt.Fprintf(w, format, args...)
if f, ok := w.(http.Flusher); ok {
f.Flush()
}
}
defer func() {
logLock.Lock()
handlerDone = true
logLock.Unlock()
}()
ctx, cancel := context.WithTimeout(r.Context(), dur)
defer cancel()
done := make(chan bool, 1)
var c *portmapper.Client
c = portmapper.NewClient(logger.WithPrefix(logf, "portmapper: "), h.netMon, debugKnobs, h.b.ControlKnobs(), func() {
logf("portmapping changed.")
logf("have mapping: %v", c.HaveMapping())
if ext, ok := c.GetCachedMappingOrStartCreatingOne(); ok {
logf("cb: mapping: %v", ext)
select {
case done <- true:
default:
}
return
}
logf("cb: no mapping")
})
defer c.Close()
netMon, err := netmon.New(logger.WithPrefix(logf, "monitor: "))
if err != nil {
logf("error creating monitor: %v", err)
return
}
gatewayAndSelfIP := func() (gw, self netip.Addr, ok bool) {
if a, b, ok := strings.Cut(gwSelf, "/"); ok {
gw = netip.MustParseAddr(a)
self = netip.MustParseAddr(b)
return gw, self, true
}
return netMon.GatewayAndSelfIP()
}
c.SetGatewayLookupFunc(gatewayAndSelfIP)
gw, selfIP, ok := gatewayAndSelfIP()
if !ok {
logf("no gateway or self IP; %v", netMon.InterfaceState())
return
}
logf("gw=%v; self=%v", gw, selfIP)
uc, err := net.ListenPacket("udp", "0.0.0.0:0")
if err != nil {
return
}
defer uc.Close()
c.SetLocalPort(uint16(uc.LocalAddr().(*net.UDPAddr).Port))
res, err := c.Probe(ctx)
if err != nil {
logf("error in Probe: %v", err)
return
}
logf("Probe: %+v", res)
if !res.PCP && !res.PMP && !res.UPnP {
logf("no portmapping services available")
return
}
if ext, ok := c.GetCachedMappingOrStartCreatingOne(); ok {
logf("mapping: %v", ext)
} else {
logf("no mapping")
}
select {
case <-done:
case <-ctx.Done():
if r.Context().Err() == nil {
logf("serveDebugPortmap: context done: %v", ctx.Err())
} else {
h.logf("serveDebugPortmap: context done: %v", ctx.Err())
}
}
}
func (h *Handler) serveComponentDebugLogging(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "debug access denied", http.StatusForbidden)
return
}
component := r.FormValue("component")
secs, _ := strconv.Atoi(r.FormValue("secs"))
err := h.b.SetComponentDebugLogging(component, h.clock.Now().Add(time.Duration(secs)*time.Second))
var res struct {
Error string
}
if err != nil {
res.Error = err.Error()
}
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(res)
}
func (h *Handler) serveDebugDialTypes(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "debug-dial-types access denied", http.StatusForbidden)
return
}
if r.Method != httpm.POST {
http.Error(w, "only POST allowed", http.StatusMethodNotAllowed)
return
}
ip := r.FormValue("ip")
port := r.FormValue("port")
network := r.FormValue("network")
addr := ip + ":" + port
if _, err := netip.ParseAddrPort(addr); err != nil {
w.WriteHeader(http.StatusBadRequest)
fmt.Fprintf(w, "invalid address %q: %v", addr, err)
return
}
ctx, cancel := context.WithTimeout(r.Context(), 5*time.Second)
defer cancel()
var bareDialer net.Dialer
dialer := h.b.Dialer()
var peerDialer net.Dialer
peerDialer.Control = dialer.PeerDialControlFunc()
// Kick off a dial with each available dialer in parallel.
dialers := []struct {
name string
dial func(context.Context, string, string) (net.Conn, error)
}{
{"SystemDial", dialer.SystemDial},
{"UserDial", dialer.UserDial},
{"PeerDial", peerDialer.DialContext},
{"BareDial", bareDialer.DialContext},
}
type result struct {
name string
conn net.Conn
err error
}
results := make(chan result, len(dialers))
var wg sync.WaitGroup
for _, dialer := range dialers {
dialer := dialer // loop capture
wg.Add(1)
go func() {
defer wg.Done()
conn, err := dialer.dial(ctx, network, addr)
results <- result{dialer.name, conn, err}
}()
}
wg.Wait()
for i := 0; i < len(dialers); i++ {
res := <-results
fmt.Fprintf(w, "[%s] connected=%v err=%v\n", res.name, res.conn != nil, res.err)
if res.conn != nil {
res.conn.Close()
}
}
}
// servePprofFunc is the implementation of Handler.servePprof, after auth,
// for platforms where we want to link it in.
var servePprofFunc func(http.ResponseWriter, *http.Request)
func (h *Handler) servePprof(w http.ResponseWriter, r *http.Request) {
// Require write access out of paranoia that the profile dump
// might contain something sensitive.
if !h.PermitWrite {
http.Error(w, "profile access denied", http.StatusForbidden)
return
}
if servePprofFunc == nil {
http.Error(w, "not implemented on this platform", http.StatusServiceUnavailable)
return
}
servePprofFunc(w, r)
}
func (h *Handler) reloadConfig(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "access denied", http.StatusForbidden)
return
}
if r.Method != httpm.POST {
http.Error(w, "use POST", http.StatusMethodNotAllowed)
return
}
ok, err := h.b.ReloadConfig()
var res apitype.ReloadConfigResponse
res.Reloaded = ok
if err != nil {
res.Err = err.Error()
return
}
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(&res)
}
func (h *Handler) serveResetAuth(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "reset-auth modify access denied", http.StatusForbidden)
return
}
if r.Method != httpm.POST {
http.Error(w, "use POST", http.StatusMethodNotAllowed)
return
}
if err := h.b.ResetAuth(); err != nil {
http.Error(w, "reset-auth failed: "+err.Error(), http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusNoContent)
}
func (h *Handler) serveServeConfig(w http.ResponseWriter, r *http.Request) {
switch r.Method {
case "GET":
if !h.PermitRead {
http.Error(w, "serve config denied", http.StatusForbidden)
return
}
config := h.b.ServeConfig()
bts, err := json.Marshal(config)
if err != nil {
http.Error(w, "error encoding config: "+err.Error(), http.StatusInternalServerError)
return
}
sum := sha256.Sum256(bts)
etag := hex.EncodeToString(sum[:])
w.Header().Set("Etag", etag)
w.Header().Set("Content-Type", "application/json")
w.Write(bts)
case "POST":
if !h.PermitWrite {
http.Error(w, "serve config denied", http.StatusForbidden)
return
}
configIn := new(ipn.ServeConfig)
if err := json.NewDecoder(r.Body).Decode(configIn); err != nil {
writeErrorJSON(w, fmt.Errorf("decoding config: %w", err))
return
}
// require a local admin when setting a path handler
// TODO: roll-up this Windows-specific check into either PermitWrite
// or a global admin escalation check.
if err := authorizeServeConfigForGOOSAndUserContext(runtime.GOOS, configIn, h); err != nil {
http.Error(w, err.Error(), http.StatusUnauthorized)
return
}
etag := r.Header.Get("If-Match")
if err := h.b.SetServeConfig(configIn, etag); err != nil {
if errors.Is(err, ipnlocal.ErrETagMismatch) {
http.Error(w, err.Error(), http.StatusPreconditionFailed)
return
}
writeErrorJSON(w, fmt.Errorf("updating config: %w", err))
return
}
w.WriteHeader(http.StatusOK)
default:
http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
}
}
func authorizeServeConfigForGOOSAndUserContext(goos string, configIn *ipn.ServeConfig, h *Handler) error {
switch goos {
case "windows", "linux", "darwin":
default:
return nil
}
// Only check for local admin on tailscaled-on-mac (based on "sudo"
// permissions). On sandboxed variants (MacSys and AppStore), tailscaled
// cannot serve files outside of the sandbox and this check is not
// relevant.
if goos == "darwin" && version.IsSandboxedMacOS() {
return nil
}
if !configIn.HasPathHandler() {
return nil
}
if h.connIsLocalAdmin() {
return nil
}
switch goos {
case "windows":
return errors.New("must be a Windows local admin to serve a path")
case "linux", "darwin":
return errors.New("must be root, or be an operator and able to run 'sudo tailscale' to serve a path")
default:
// We filter goos at the start of the func, this default case
// should never happen.
panic("unreachable")
}
}
// connIsLocalAdmin reports whether the connected client has administrative
// access to the local machine, for whatever that means with respect to the
// current OS.
//
// This is useful because tailscaled itself always runs with elevated rights:
// we want to avoid privilege escalation for certain mutative operations.
func (h *Handler) connIsLocalAdmin() bool {
if h.testConnIsLocalAdmin != nil {
return *h.testConnIsLocalAdmin
}
if h.ConnIdentity == nil {
h.logf("[unexpected] missing ConnIdentity in LocalAPI Handler")
return false
}
switch runtime.GOOS {
case "windows":
tok, err := h.ConnIdentity.WindowsToken()
if err != nil {
if !errors.Is(err, ipnauth.ErrNotImplemented) {
h.logf("ipnauth.ConnIdentity.WindowsToken() error: %v", err)
}
return false
}
defer tok.Close()
return tok.IsElevated()
case "darwin":
// Unknown, or at least unchecked on sandboxed macOS variants. Err on
// the side of less permissions.
//
// authorizeServeConfigForGOOSAndUserContext should not call
// connIsLocalAdmin on sandboxed variants anyway.
if version.IsSandboxedMacOS() {
return false
}
// This is a standalone tailscaled setup, use the same logic as on
// Linux.
fallthrough
case "linux":
uid, ok := h.ConnIdentity.Creds().UserID()
if !ok {
return false
}
// root is always admin.
if uid == "0" {
return true
}
// if non-root, must be operator AND able to execute "sudo tailscale".
operatorUID := h.b.OperatorUserID()
if operatorUID != "" && uid != operatorUID {
return false
}
u, err := osuser.LookupByUID(uid)
if err != nil {
return false
}
// Short timeout just in case sudo hangs for some reason.
ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
defer cancel()
if err := exec.CommandContext(ctx, "sudo", "--other-user="+u.Name, "--list", "tailscale").Run(); err != nil {
return false
}
return true
default:
return false
}
}
func (h *Handler) getUsername() (string, error) {
if h.ConnIdentity == nil {
h.logf("[unexpected] missing ConnIdentity in LocalAPI Handler")
return "", errors.New("missing ConnIdentity")
}
switch runtime.GOOS {
case "windows":
tok, err := h.ConnIdentity.WindowsToken()
if err != nil {
return "", fmt.Errorf("get windows token: %w", err)
}
defer tok.Close()
return tok.Username()
case "darwin", "linux":
uid, ok := h.ConnIdentity.Creds().UserID()
if !ok {
return "", errors.New("missing user ID")
}
u, err := osuser.LookupByUID(uid)
if err != nil {
return "", fmt.Errorf("lookup user: %w", err)
}
return u.Username, nil
default:
return "", errors.New("unsupported OS")
}
}
func (h *Handler) serveCheckIPForwarding(w http.ResponseWriter, r *http.Request) {
if !h.PermitRead {
http.Error(w, "IP forwarding check access denied", http.StatusForbidden)
return
}
var warning string
if err := h.b.CheckIPForwarding(); err != nil {
warning = err.Error()
}
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(struct {
Warning string
}{
Warning: warning,
})
}
func (h *Handler) serveCheckUDPGROForwarding(w http.ResponseWriter, r *http.Request) {
if !h.PermitRead {
http.Error(w, "UDP GRO forwarding check access denied", http.StatusForbidden)
return
}
var warning string
if err := h.b.CheckUDPGROForwarding(); err != nil {
warning = err.Error()
}
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(struct {
Warning string
}{
Warning: warning,
})
}
func (h *Handler) serveStatus(w http.ResponseWriter, r *http.Request) {
if !h.PermitRead {
http.Error(w, "status access denied", http.StatusForbidden)
return
}
w.Header().Set("Content-Type", "application/json")
var st *ipnstate.Status
if defBool(r.FormValue("peers"), true) {
st = h.b.Status()
} else {
st = h.b.StatusWithoutPeers()
}
e := json.NewEncoder(w)
e.SetIndent("", "\t")
e.Encode(st)
}
func (h *Handler) serveDebugPeerEndpointChanges(w http.ResponseWriter, r *http.Request) {
if !h.PermitRead {
http.Error(w, "status access denied", http.StatusForbidden)
return
}
ipStr := r.FormValue("ip")
if ipStr == "" {
http.Error(w, "missing 'ip' parameter", http.StatusBadRequest)
return
}
ip, err := netip.ParseAddr(ipStr)
if err != nil {
http.Error(w, "invalid IP", http.StatusBadRequest)
return
}
w.Header().Set("Content-Type", "application/json")
chs, err := h.b.GetPeerEndpointChanges(r.Context(), ip)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
e := json.NewEncoder(w)
e.SetIndent("", "\t")
e.Encode(chs)
}
// InUseOtherUserIPNStream reports whether r is a request for the watch-ipn-bus
// handler. If so, it writes an ipn.Notify InUseOtherUser message to the user
// and returns true. Otherwise it returns false, in which case it doesn't write
// to w.
//
// Unlike the regular watch-ipn-bus handler, this one doesn't block. The caller
// (in ipnserver.Server) provides the blocking until the connection is no longer
// in use.
func InUseOtherUserIPNStream(w http.ResponseWriter, r *http.Request, err error) (handled bool) {
if r.Method != "GET" || r.URL.Path != "/localapi/v0/watch-ipn-bus" {
return false
}
js, err := json.Marshal(&ipn.Notify{
Version: version.Long(),
State: ptr.To(ipn.InUseOtherUser),
ErrMessage: ptr.To(err.Error()),
})
if err != nil {
return false
}
js = append(js, '\n')
w.Header().Set("Content-Type", "application/json")
w.Write(js)
return true
}
func (h *Handler) serveWatchIPNBus(w http.ResponseWriter, r *http.Request) {
if !h.PermitRead {
http.Error(w, "watch ipn bus access denied", http.StatusForbidden)
return
}
f, ok := w.(http.Flusher)
if !ok {
http.Error(w, "not a flusher", http.StatusInternalServerError)
return
}
var mask ipn.NotifyWatchOpt
if s := r.FormValue("mask"); s != "" {
v, err := strconv.ParseUint(s, 10, 64)
if err != nil {
http.Error(w, "bad mask", http.StatusBadRequest)
return
}
mask = ipn.NotifyWatchOpt(v)
}
// Users with only read access must request private key filtering. If they
// don't filter out private keys, require write access.
if (mask & ipn.NotifyNoPrivateKeys) == 0 {
if !h.PermitWrite {
http.Error(w, "watch IPN bus access denied, must set ipn.NotifyNoPrivateKeys when not running as admin/root or operator", http.StatusForbidden)
return
}
}
w.Header().Set("Content-Type", "application/json")
ctx := r.Context()
h.b.WatchNotifications(ctx, mask, f.Flush, func(roNotify *ipn.Notify) (keepGoing bool) {
js, err := json.Marshal(roNotify)
if err != nil {
h.logf("json.Marshal: %v", err)
return false
}
if _, err := fmt.Fprintf(w, "%s\n", js); err != nil {
return false
}
f.Flush()
return true
})
}
func (h *Handler) serveLoginInteractive(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "login access denied", http.StatusForbidden)
return
}
if r.Method != "POST" {
http.Error(w, "want POST", http.StatusBadRequest)
return
}
h.b.StartLoginInteractive()
w.WriteHeader(http.StatusNoContent)
return
}
func (h *Handler) serveStart(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "access denied", http.StatusForbidden)
return
}
if r.Method != "POST" {
http.Error(w, "want POST", http.StatusBadRequest)
return
}
var o ipn.Options
if err := json.NewDecoder(r.Body).Decode(&o); err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
err := h.b.Start(o)
if err != nil {
// TODO(bradfitz): map error to a good HTTP error
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusNoContent)
}
func (h *Handler) serveLogout(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "logout access denied", http.StatusForbidden)
return
}
if r.Method != "POST" {
http.Error(w, "want POST", http.StatusBadRequest)
return
}
err := h.b.Logout(r.Context())
if err == nil {
w.WriteHeader(http.StatusNoContent)
return
}
http.Error(w, err.Error(), http.StatusInternalServerError)
}
func (h *Handler) servePrefs(w http.ResponseWriter, r *http.Request) {
if !h.PermitRead {
http.Error(w, "prefs access denied", http.StatusForbidden)
return
}
var prefs ipn.PrefsView
switch r.Method {
case "PATCH":
if !h.PermitWrite {
http.Error(w, "prefs write access denied", http.StatusForbidden)
return
}
mp := new(ipn.MaskedPrefs)
if err := json.NewDecoder(r.Body).Decode(mp); err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
var err error
prefs, err = h.b.EditPrefs(mp)
if err != nil {
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusBadRequest)
json.NewEncoder(w).Encode(resJSON{Error: err.Error()})
return
}
case "GET", "HEAD":
prefs = h.b.Prefs()
default:
http.Error(w, "unsupported method", http.StatusMethodNotAllowed)
return
}
w.Header().Set("Content-Type", "application/json")
e := json.NewEncoder(w)
e.SetIndent("", "\t")
e.Encode(prefs)
}
type resJSON struct {
Error string `json:",omitempty"`
}
func (h *Handler) serveCheckPrefs(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "checkprefs access denied", http.StatusForbidden)
return
}
if r.Method != "POST" {
http.Error(w, "unsupported method", http.StatusMethodNotAllowed)
return
}
p := new(ipn.Prefs)
if err := json.NewDecoder(r.Body).Decode(p); err != nil {
http.Error(w, "invalid JSON body", http.StatusBadRequest)
return
}
err := h.b.CheckPrefs(p)
var res resJSON
if err != nil {
res.Error = err.Error()
}
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(res)
}
func (h *Handler) serveFiles(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "file access denied", http.StatusForbidden)
return
}
suffix, ok := strings.CutPrefix(r.URL.EscapedPath(), "/localapi/v0/files/")
if !ok {
http.Error(w, "misconfigured", http.StatusInternalServerError)
return
}
if suffix == "" {
if r.Method != "GET" {
http.Error(w, "want GET to list files", http.StatusBadRequest)
return
}
ctx := r.Context()
if s := r.FormValue("waitsec"); s != "" && s != "0" {
d, err := strconv.Atoi(s)
if err != nil {
http.Error(w, "invalid waitsec", http.StatusBadRequest)
return
}
deadline := time.Now().Add(time.Duration(d) * time.Second)
var cancel context.CancelFunc
ctx, cancel = context.WithDeadline(ctx, deadline)
defer cancel()
}
wfs, err := h.b.AwaitWaitingFiles(ctx)
if err != nil && ctx.Err() == nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(wfs)
return
}
name, err := url.PathUnescape(suffix)
if err != nil {
http.Error(w, "bad filename", http.StatusBadRequest)
return
}
if r.Method == "DELETE" {
if err := h.b.DeleteFile(name); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusNoContent)
return
}
rc, size, err := h.b.OpenFile(name)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
defer rc.Close()
w.Header().Set("Content-Length", fmt.Sprint(size))
w.Header().Set("Content-Type", "application/octet-stream")
io.Copy(w, rc)
}
func writeErrorJSON(w http.ResponseWriter, err error) {
if err == nil {
err = errors.New("unexpected nil error")
}
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusInternalServerError)
type E struct {
Error string `json:"error"`
}
json.NewEncoder(w).Encode(E{err.Error()})
}
func (h *Handler) serveFileTargets(w http.ResponseWriter, r *http.Request) {
if !h.PermitRead {
http.Error(w, "access denied", http.StatusForbidden)
return
}
if r.Method != "GET" {
http.Error(w, "want GET to list targets", http.StatusBadRequest)
return
}
fts, err := h.b.FileTargets()
if err != nil {
writeErrorJSON(w, err)
return
}
mak.NonNilSliceForJSON(&fts)
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(fts)
}
// serveFilePut sends a file to another node.
//
// It's sometimes possible for clients to do this themselves, without
// tailscaled, except in the case of tailscaled running in
// userspace-networking ("netstack") mode, in which case tailscaled
// needs to a do a netstack dial out.
//
// Instead, the CLI also goes through tailscaled so it doesn't need to be
// aware of the network mode in use.
//
// macOS/iOS have always used this localapi method to simplify the GUI
// clients.
//
// The Windows client currently (2021-11-30) uses the peerapi (/v0/put/)
// directly, as the Windows GUI always runs in tun mode anyway.
//
// URL format:
//
// - PUT /localapi/v0/file-put/:stableID/:escaped-filename
func (h *Handler) serveFilePut(w http.ResponseWriter, r *http.Request) {
metricFilePutCalls.Add(1)
if !h.PermitWrite {
http.Error(w, "file access denied", http.StatusForbidden)
return
}
if r.Method != "PUT" {
http.Error(w, "want PUT to put file", http.StatusBadRequest)
return
}
fts, err := h.b.FileTargets()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
upath, ok := strings.CutPrefix(r.URL.EscapedPath(), "/localapi/v0/file-put/")
if !ok {
http.Error(w, "misconfigured", http.StatusInternalServerError)
return
}
stableIDStr, filenameEscaped, ok := strings.Cut(upath, "/")
if !ok {
http.Error(w, "bogus URL", http.StatusBadRequest)
return
}
stableID := tailcfg.StableNodeID(stableIDStr)
var ft *apitype.FileTarget
for _, x := range fts {
if x.Node.StableID == stableID {
ft = x
break
}
}
if ft == nil {
http.Error(w, "node not found", http.StatusNotFound)
return
}
dstURL, err := url.Parse(ft.PeerAPIURL)
if err != nil {
http.Error(w, "bogus peer URL", http.StatusInternalServerError)
return
}
// Before we PUT a file we check to see if there are any existing partial file and if so,
// we resume the upload from where we left off by sending the remaining file instead of
// the full file.
var offset int64
var resumeDuration time.Duration
remainingBody := io.Reader(r.Body)
client := &http.Client{
Transport: h.b.Dialer().PeerAPITransport(),
Timeout: 10 * time.Second,
}
req, err := http.NewRequestWithContext(r.Context(), "GET", dstURL.String()+"/v0/put/"+filenameEscaped, nil)
if err != nil {
http.Error(w, "bogus peer URL", http.StatusInternalServerError)
return
}
switch resp, err := client.Do(req); {
case err != nil:
h.logf("could not fetch remote hashes: %v", err)
case resp.StatusCode == http.StatusMethodNotAllowed || resp.StatusCode == http.StatusNotFound:
// noop; implies older peerapi without resume support
case resp.StatusCode != http.StatusOK:
h.logf("fetch remote hashes status code: %d", resp.StatusCode)
default:
resumeStart := time.Now()
dec := json.NewDecoder(resp.Body)
offset, remainingBody, err = taildrop.ResumeReader(r.Body, func() (out taildrop.BlockChecksum, err error) {
err = dec.Decode(&out)
return out, err
})
if err != nil {
h.logf("reader could not be fully resumed: %v", err)
}
resumeDuration = time.Since(resumeStart).Round(time.Millisecond)
}
outReq, err := http.NewRequestWithContext(r.Context(), "PUT", "http://peer/v0/put/"+filenameEscaped, remainingBody)
if err != nil {
http.Error(w, "bogus outreq", http.StatusInternalServerError)
return
}
outReq.ContentLength = r.ContentLength
if offset > 0 {
h.logf("resuming put at offset %d after %v", offset, resumeDuration)
rangeHdr, _ := httphdr.FormatRange([]httphdr.Range{{Start: offset, Length: 0}})
outReq.Header.Set("Range", rangeHdr)
if outReq.ContentLength >= 0 {
outReq.ContentLength -= offset
}
}
rp := httputil.NewSingleHostReverseProxy(dstURL)
rp.Transport = h.b.Dialer().PeerAPITransport()
rp.ServeHTTP(w, outReq)
}
func (h *Handler) serveSetDNS(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "access denied", http.StatusForbidden)
return
}
if r.Method != "POST" {
http.Error(w, "want POST", http.StatusBadRequest)
return
}
ctx := r.Context()
err := h.b.SetDNS(ctx, r.FormValue("name"), r.FormValue("value"))
if err != nil {
writeErrorJSON(w, err)
return
}
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(struct{}{})
}
func (h *Handler) serveDERPMap(w http.ResponseWriter, r *http.Request) {
if r.Method != "GET" {
http.Error(w, "want GET", http.StatusBadRequest)
return
}
w.Header().Set("Content-Type", "application/json")
e := json.NewEncoder(w)
e.SetIndent("", "\t")
e.Encode(h.b.DERPMap())
}
// serveSetExpirySooner sets the expiry date on the current machine, specified
// by an `expiry` unix timestamp as POST or query param.
func (h *Handler) serveSetExpirySooner(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "access denied", http.StatusForbidden)
return
}
if r.Method != "POST" {
http.Error(w, "POST required", http.StatusMethodNotAllowed)
return
}
var expiryTime time.Time
if v := r.FormValue("expiry"); v != "" {
expiryInt, err := strconv.ParseInt(v, 10, 64)
if err != nil {
http.Error(w, "can't parse expiry time, expects a unix timestamp", http.StatusBadRequest)
return
}
expiryTime = time.Unix(expiryInt, 0)
} else {
http.Error(w, "missing 'expiry' parameter, a unix timestamp", http.StatusBadRequest)
return
}
err := h.b.SetExpirySooner(r.Context(), expiryTime)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
w.Header().Set("Content-Type", "text/plain")
io.WriteString(w, "done\n")
}
func (h *Handler) servePing(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
if r.Method != "POST" {
http.Error(w, "want POST", http.StatusBadRequest)
return
}
ipStr := r.FormValue("ip")
if ipStr == "" {
http.Error(w, "missing 'ip' parameter", http.StatusBadRequest)
return
}
ip, err := netip.ParseAddr(ipStr)
if err != nil {
http.Error(w, "invalid IP", http.StatusBadRequest)
return
}
pingTypeStr := r.FormValue("type")
if pingTypeStr == "" {
http.Error(w, "missing 'type' parameter", http.StatusBadRequest)
return
}
size := 0
sizeStr := r.FormValue("size")
if sizeStr != "" {
size, err = strconv.Atoi(sizeStr)
if err != nil {
http.Error(w, "invalid 'size' parameter", http.StatusBadRequest)
return
}
if size != 0 && tailcfg.PingType(pingTypeStr) != tailcfg.PingDisco {
http.Error(w, "'size' parameter is only supported with disco pings", http.StatusBadRequest)
return
}
if size > magicsock.MaxDiscoPingSize {
http.Error(w, fmt.Sprintf("maximum value for 'size' is %v", magicsock.MaxDiscoPingSize), http.StatusBadRequest)
return
}
}
res, err := h.b.Ping(ctx, ip, tailcfg.PingType(pingTypeStr), size)
if err != nil {
writeErrorJSON(w, err)
return
}
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(res)
}
func (h *Handler) serveDial(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
http.Error(w, "POST required", http.StatusMethodNotAllowed)
return
}
const upgradeProto = "ts-dial"
if !strings.Contains(r.Header.Get("Connection"), "upgrade") ||
r.Header.Get("Upgrade") != upgradeProto {
http.Error(w, "bad ts-dial upgrade", http.StatusBadRequest)
return
}
hostStr, portStr := r.Header.Get("Dial-Host"), r.Header.Get("Dial-Port")
if hostStr == "" || portStr == "" {
http.Error(w, "missing Dial-Host or Dial-Port header", http.StatusBadRequest)
return
}
hijacker, ok := w.(http.Hijacker)
if !ok {
http.Error(w, "make request over HTTP/1", http.StatusBadRequest)
return
}
addr := net.JoinHostPort(hostStr, portStr)
outConn, err := h.b.Dialer().UserDial(r.Context(), "tcp", addr)
if err != nil {
http.Error(w, "dial failure: "+err.Error(), http.StatusBadGateway)
return
}
defer outConn.Close()
w.Header().Set("Upgrade", upgradeProto)
w.Header().Set("Connection", "upgrade")
w.WriteHeader(http.StatusSwitchingProtocols)
reqConn, brw, err := hijacker.Hijack()
if err != nil {
h.logf("localapi dial Hijack error: %v", err)
return
}
defer reqConn.Close()
if err := brw.Flush(); err != nil {
return
}
reqConn = netutil.NewDrainBufConn(reqConn, brw.Reader)
errc := make(chan error, 1)
go func() {
_, err := io.Copy(reqConn, outConn)
errc <- err
}()
go func() {
_, err := io.Copy(outConn, reqConn)
errc <- err
}()
<-errc
}
func (h *Handler) serveSetPushDeviceToken(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "set push device token access denied", http.StatusForbidden)
return
}
if r.Method != "POST" {
http.Error(w, "unsupported method", http.StatusMethodNotAllowed)
return
}
var params apitype.SetPushDeviceTokenRequest
if err := json.NewDecoder(r.Body).Decode(&params); err != nil {
http.Error(w, "invalid JSON body", http.StatusBadRequest)
return
}
h.b.SetPushDeviceToken(params.PushDeviceToken)
w.WriteHeader(http.StatusOK)
}
func (h *Handler) serveHandlePushMessage(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "handle push message not allowed", http.StatusForbidden)
return
}
if r.Method != "POST" {
http.Error(w, "unsupported method", http.StatusMethodNotAllowed)
return
}
var pushMessageBody map[string]any
if err := json.NewDecoder(r.Body).Decode(&pushMessageBody); err != nil {
http.Error(w, "failed to decode JSON body: "+err.Error(), http.StatusBadRequest)
return
}
// TODO(bradfitz): do something with pushMessageBody
h.logf("localapi: got push message: %v", logger.AsJSON(pushMessageBody))
w.WriteHeader(http.StatusNoContent)
}
func (h *Handler) serveUploadClientMetrics(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
http.Error(w, "unsupported method", http.StatusMethodNotAllowed)
return
}
type clientMetricJSON struct {
Name string `json:"name"`
Type string `json:"type"` // one of "counter" or "gauge"
Value int `json:"value"` // amount to increment metric by
}
var clientMetrics []clientMetricJSON
if err := json.NewDecoder(r.Body).Decode(&clientMetrics); err != nil {
http.Error(w, "invalid JSON body", http.StatusBadRequest)
return
}
metricsMu.Lock()
defer metricsMu.Unlock()
for _, m := range clientMetrics {
if metric, ok := metrics[m.Name]; ok {
metric.Add(int64(m.Value))
} else {
if clientmetric.HasPublished(m.Name) {
http.Error(w, "Already have a metric named "+m.Name, http.StatusBadRequest)
return
}
var metric *clientmetric.Metric
switch m.Type {
case "counter":
metric = clientmetric.NewCounter(m.Name)
case "gauge":
metric = clientmetric.NewGauge(m.Name)
default:
http.Error(w, "Unknown metric type "+m.Type, http.StatusBadRequest)
return
}
metrics[m.Name] = metric
metric.Add(int64(m.Value))
}
}
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(struct{}{})
}
func (h *Handler) serveTKAStatus(w http.ResponseWriter, r *http.Request) {
if !h.PermitRead {
http.Error(w, "lock status access denied", http.StatusForbidden)
return
}
if r.Method != httpm.GET {
http.Error(w, "use GET", http.StatusMethodNotAllowed)
return
}
j, err := json.MarshalIndent(h.b.NetworkLockStatus(), "", "\t")
if err != nil {
http.Error(w, "JSON encoding error", http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.Write(j)
}
func (h *Handler) serveSetGUIVisible(w http.ResponseWriter, r *http.Request) {
if r.Method != httpm.POST {
http.Error(w, "use POST", http.StatusMethodNotAllowed)
return
}
type setGUIVisibleRequest struct {
IsVisible bool // whether the Tailscale client UI is now presented to the user
SessionID string // the last SessionID sent to the client in ipn.Notify.SessionID
}
var req setGUIVisibleRequest
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
http.Error(w, "invalid JSON body", http.StatusBadRequest)
return
}
// TODO(bradfitz): use `req.IsVisible == true` to flush netmap
w.WriteHeader(http.StatusOK)
}
func (h *Handler) serveTKASign(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "lock sign access denied", http.StatusForbidden)
return
}
if r.Method != httpm.POST {
http.Error(w, "use POST", http.StatusMethodNotAllowed)
return
}
type signRequest struct {
NodeKey key.NodePublic
RotationPublic []byte
}
var req signRequest
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
http.Error(w, "invalid JSON body", http.StatusBadRequest)
return
}
if err := h.b.NetworkLockSign(req.NodeKey, req.RotationPublic); err != nil {
http.Error(w, "signing failed: "+err.Error(), http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusOK)
}
func (h *Handler) serveTKAInit(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "lock init access denied", http.StatusForbidden)
return
}
if r.Method != httpm.POST {
http.Error(w, "use POST", http.StatusMethodNotAllowed)
return
}
type initRequest struct {
Keys []tka.Key
DisablementValues [][]byte
SupportDisablement []byte
}
var req initRequest
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
http.Error(w, "invalid JSON body", http.StatusBadRequest)
return
}
if err := h.b.NetworkLockInit(req.Keys, req.DisablementValues, req.SupportDisablement); err != nil {
http.Error(w, "initialization failed: "+err.Error(), http.StatusInternalServerError)
return
}
j, err := json.MarshalIndent(h.b.NetworkLockStatus(), "", "\t")
if err != nil {
http.Error(w, "JSON encoding error", http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.Write(j)
}
func (h *Handler) serveTKAModify(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "network-lock modify access denied", http.StatusForbidden)
return
}
if r.Method != httpm.POST {
http.Error(w, "use POST", http.StatusMethodNotAllowed)
return
}
type modifyRequest struct {
AddKeys []tka.Key
RemoveKeys []tka.Key
}
var req modifyRequest
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
http.Error(w, "invalid JSON body", http.StatusBadRequest)
return
}
if err := h.b.NetworkLockModify(req.AddKeys, req.RemoveKeys); err != nil {
http.Error(w, "network-lock modify failed: "+err.Error(), http.StatusInternalServerError)
return
}
w.WriteHeader(204)
}
func (h *Handler) serveTKAWrapPreauthKey(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "network-lock modify access denied", http.StatusForbidden)
return
}
if r.Method != httpm.POST {
http.Error(w, "use POST", http.StatusMethodNotAllowed)
return
}
type wrapRequest struct {
TSKey string
TKAKey string // key.NLPrivate.MarshalText
}
var req wrapRequest
if err := json.NewDecoder(http.MaxBytesReader(w, r.Body, 12*1024)).Decode(&req); err != nil {
http.Error(w, "invalid JSON body", http.StatusBadRequest)
return
}
var priv key.NLPrivate
if err := priv.UnmarshalText([]byte(req.TKAKey)); err != nil {
http.Error(w, "invalid JSON body", http.StatusBadRequest)
return
}
wrappedKey, err := h.b.NetworkLockWrapPreauthKey(req.TSKey, priv)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusOK)
w.Write([]byte(wrappedKey))
}
func (h *Handler) serveTKAVerifySigningDeeplink(w http.ResponseWriter, r *http.Request) {
if !h.PermitRead {
http.Error(w, "signing deeplink verification access denied", http.StatusForbidden)
return
}
if r.Method != httpm.POST {
http.Error(w, "use POST", http.StatusMethodNotAllowed)
return
}
type verifyRequest struct {
URL string
}
var req verifyRequest
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
http.Error(w, "invalid JSON for verifyRequest body", http.StatusBadRequest)
return
}
res := h.b.NetworkLockVerifySigningDeeplink(req.URL)
j, err := json.MarshalIndent(res, "", "\t")
if err != nil {
http.Error(w, "JSON encoding error", http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.Write(j)
}
func (h *Handler) serveTKADisable(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "network-lock modify access denied", http.StatusForbidden)
return
}
if r.Method != httpm.POST {
http.Error(w, "use POST", http.StatusMethodNotAllowed)
return
}
body := io.LimitReader(r.Body, 1024*1024)
secret, err := io.ReadAll(body)
if err != nil {
http.Error(w, "reading secret", http.StatusBadRequest)
return
}
if err := h.b.NetworkLockDisable(secret); err != nil {
http.Error(w, "network-lock disable failed: "+err.Error(), http.StatusBadRequest)
return
}
w.WriteHeader(http.StatusOK)
}
func (h *Handler) serveTKALocalDisable(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "network-lock modify access denied", http.StatusForbidden)
return
}
if r.Method != httpm.POST {
http.Error(w, "use POST", http.StatusMethodNotAllowed)
return
}
// Require a JSON stanza for the body as an additional CSRF protection.
var req struct{}
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
http.Error(w, "invalid JSON body", http.StatusBadRequest)
return
}
if err := h.b.NetworkLockForceLocalDisable(); err != nil {
http.Error(w, "network-lock local disable failed: "+err.Error(), http.StatusBadRequest)
return
}
w.WriteHeader(http.StatusOK)
}
func (h *Handler) serveTKALog(w http.ResponseWriter, r *http.Request) {
if r.Method != httpm.GET {
http.Error(w, "use GET", http.StatusMethodNotAllowed)
return
}
limit := 50
if limitStr := r.FormValue("limit"); limitStr != "" {
l, err := strconv.Atoi(limitStr)
if err != nil {
http.Error(w, "parsing 'limit' parameter: "+err.Error(), http.StatusBadRequest)
return
}
limit = int(l)
}
updates, err := h.b.NetworkLockLog(limit)
if err != nil {
http.Error(w, "reading log failed: "+err.Error(), http.StatusInternalServerError)
return
}
j, err := json.MarshalIndent(updates, "", "\t")
if err != nil {
http.Error(w, "JSON encoding error", http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.Write(j)
}
func (h *Handler) serveTKAAffectedSigs(w http.ResponseWriter, r *http.Request) {
if r.Method != httpm.POST {
http.Error(w, "use POST", http.StatusMethodNotAllowed)
return
}
keyID, err := io.ReadAll(http.MaxBytesReader(w, r.Body, 2048))
if err != nil {
http.Error(w, "reading body", http.StatusBadRequest)
return
}
sigs, err := h.b.NetworkLockAffectedSigs(keyID)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
j, err := json.MarshalIndent(sigs, "", "\t")
if err != nil {
http.Error(w, "JSON encoding error", http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.Write(j)
}
func (h *Handler) serveTKAGenerateRecoveryAUM(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "access denied", http.StatusForbidden)
return
}
if r.Method != httpm.POST {
http.Error(w, "use POST", http.StatusMethodNotAllowed)
return
}
type verifyRequest struct {
Keys []tkatype.KeyID
ForkFrom string
}
var req verifyRequest
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
http.Error(w, "invalid JSON for verifyRequest body", http.StatusBadRequest)
return
}
var forkFrom tka.AUMHash
if req.ForkFrom != "" {
if err := forkFrom.UnmarshalText([]byte(req.ForkFrom)); err != nil {
http.Error(w, "decoding fork-from: "+err.Error(), http.StatusBadRequest)
return
}
}
res, err := h.b.NetworkLockGenerateRecoveryAUM(req.Keys, forkFrom)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/octet-stream")
w.Write(res.Serialize())
}
func (h *Handler) serveTKACosignRecoveryAUM(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "access denied", http.StatusForbidden)
return
}
if r.Method != httpm.POST {
http.Error(w, "use POST", http.StatusMethodNotAllowed)
return
}
body := io.LimitReader(r.Body, 1024*1024)
aumBytes, err := io.ReadAll(body)
if err != nil {
http.Error(w, "reading AUM", http.StatusBadRequest)
return
}
var aum tka.AUM
if err := aum.Unserialize(aumBytes); err != nil {
http.Error(w, "decoding AUM", http.StatusBadRequest)
return
}
res, err := h.b.NetworkLockCosignRecoveryAUM(&aum)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/octet-stream")
w.Write(res.Serialize())
}
func (h *Handler) serveTKASubmitRecoveryAUM(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "access denied", http.StatusForbidden)
return
}
if r.Method != httpm.POST {
http.Error(w, "use POST", http.StatusMethodNotAllowed)
return
}
body := io.LimitReader(r.Body, 1024*1024)
aumBytes, err := io.ReadAll(body)
if err != nil {
http.Error(w, "reading AUM", http.StatusBadRequest)
return
}
var aum tka.AUM
if err := aum.Unserialize(aumBytes); err != nil {
http.Error(w, "decoding AUM", http.StatusBadRequest)
return
}
if err := h.b.NetworkLockSubmitRecoveryAUM(&aum); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusOK)
}
// serveProfiles serves profile switching-related endpoints. Supported methods
// and paths are:
// - GET /profiles/: list all profiles (JSON-encoded array of ipn.LoginProfiles)
// - PUT /profiles/: add new profile (no response). A separate
// StartLoginInteractive() is needed to populate and persist the new profile.
// - GET /profiles/current: current profile (JSON-ecoded ipn.LoginProfile)
// - GET /profiles/<id>: output profile (JSON-ecoded ipn.LoginProfile)
// - POST /profiles/<id>: switch to profile (no response)
// - DELETE /profiles/<id>: delete profile (no response)
func (h *Handler) serveProfiles(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "profiles access denied", http.StatusForbidden)
return
}
suffix, ok := strings.CutPrefix(r.URL.EscapedPath(), "/localapi/v0/profiles/")
if !ok {
http.Error(w, "misconfigured", http.StatusInternalServerError)
return
}
if suffix == "" {
switch r.Method {
case httpm.GET:
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(h.b.ListProfiles())
case httpm.PUT:
err := h.b.NewProfile()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusCreated)
default:
http.Error(w, "use GET or PUT", http.StatusMethodNotAllowed)
}
return
}
suffix, err := url.PathUnescape(suffix)
if err != nil {
http.Error(w, "bad profile ID", http.StatusBadRequest)
return
}
if suffix == "current" {
switch r.Method {
case httpm.GET:
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(h.b.CurrentProfile())
default:
http.Error(w, "use GET", http.StatusMethodNotAllowed)
}
return
}
profileID := ipn.ProfileID(suffix)
switch r.Method {
case httpm.GET:
profiles := h.b.ListProfiles()
profileIndex := slices.IndexFunc(profiles, func(p ipn.LoginProfile) bool {
return p.ID == profileID
})
if profileIndex == -1 {
http.Error(w, "Profile not found", http.StatusNotFound)
return
}
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(profiles[profileIndex])
case httpm.POST:
err := h.b.SwitchProfile(profileID)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusNoContent)
case httpm.DELETE:
err := h.b.DeleteProfile(profileID)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusNoContent)
default:
http.Error(w, "use POST or DELETE", http.StatusMethodNotAllowed)
}
}
// serveQueryFeature makes a request to the "/machine/feature/query"
// Noise endpoint to get instructions on how to enable a feature, such as
// Funnel, for the node's tailnet.
//
// This request itself does not directly enable the feature on behalf of
// the node, but rather returns information that can be presented to the
// acting user about where/how to enable the feature. If relevant, this
// includes a control URL the user can visit to explicitly consent to
// using the feature.
//
// See tailcfg.QueryFeatureResponse for full response structure.
func (h *Handler) serveQueryFeature(w http.ResponseWriter, r *http.Request) {
feature := r.FormValue("feature")
switch {
case !h.PermitRead:
http.Error(w, "access denied", http.StatusForbidden)
return
case r.Method != httpm.POST:
http.Error(w, "use POST", http.StatusMethodNotAllowed)
return
case feature == "":
http.Error(w, "missing feature", http.StatusInternalServerError)
return
}
nm := h.b.NetMap()
if nm == nil {
http.Error(w, "no netmap", http.StatusServiceUnavailable)
return
}
b, err := json.Marshal(&tailcfg.QueryFeatureRequest{
NodeKey: nm.NodeKey,
Feature: feature,
})
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
req, err := http.NewRequestWithContext(r.Context(),
"POST", "https://unused/machine/feature/query", bytes.NewReader(b))
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
resp, err := h.b.DoNoiseRequest(req)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
defer resp.Body.Close()
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(resp.StatusCode)
if _, err := io.Copy(w, resp.Body); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
}
func defBool(a string, def bool) bool {
if a == "" {
return def
}
v, err := strconv.ParseBool(a)
if err != nil {
return def
}
return v
}
func (h *Handler) serveDebugCapture(w http.ResponseWriter, r *http.Request) {
if !h.PermitWrite {
http.Error(w, "debug access denied", http.StatusForbidden)
return
}
if r.Method != "POST" {
http.Error(w, "POST required", http.StatusMethodNotAllowed)
return
}
w.WriteHeader(http.StatusOK)
w.(http.Flusher).Flush()
h.b.StreamDebugCapture(r.Context(), w)
}
func (h *Handler) serveDebugLog(w http.ResponseWriter, r *http.Request) {
if !h.PermitRead {
http.Error(w, "debug-log access denied", http.StatusForbidden)
return
}
if r.Method != httpm.POST {
http.Error(w, "only POST allowed", http.StatusMethodNotAllowed)
return
}
defer h.b.TryFlushLogs() // kick off upload after we're done logging
type logRequestJSON struct {
Lines []string
Prefix string
}
var logRequest logRequestJSON
if err := json.NewDecoder(r.Body).Decode(&logRequest); err != nil {
http.Error(w, "invalid JSON body", http.StatusBadRequest)
return
}
prefix := logRequest.Prefix
if prefix == "" {
prefix = "debug-log"
}
logf := logger.WithPrefix(h.logf, prefix+": ")
// We can write logs too fast for logtail to handle, even when
// opting-out of rate limits. Limit ourselves to at most one message
// per 20ms and a burst of 60 log lines, which should be fast enough to
// not block for too long but slow enough that we can upload all lines.
logf = logger.SlowLoggerWithClock(r.Context(), logf, 20*time.Millisecond, 60, h.clock.Now)
for _, line := range logRequest.Lines {
logf("%s", line)
}
w.WriteHeader(http.StatusNoContent)
}
// serveUpdateCheck returns the ClientVersion from Status, which contains
// information on whether an update is available, and if so, what version,
// *if* we support auto-updates on this platform. If we don't, this endpoint
// always returns a ClientVersion saying we're running the newest version.
// Effectively, it tells us whether serveUpdateInstall will be able to install
// an update for us.
func (h *Handler) serveUpdateCheck(w http.ResponseWriter, r *http.Request) {
if r.Method != "GET" {
http.Error(w, "only GET allowed", http.StatusMethodNotAllowed)
return
}
if !clientupdate.CanAutoUpdate() {
// if we don't support auto-update, just say that we're up to date
json.NewEncoder(w).Encode(tailcfg.ClientVersion{RunningLatest: true})
return
}
cv := h.b.StatusWithoutPeers().ClientVersion
// ipnstate.Status documentation notes that ClientVersion may be nil on some
// platforms where this information is unavailable. In that case, return a
// ClientVersion that says we're up to date, since we have no information on
// whether an update is possible.
if cv == nil {
cv = &tailcfg.ClientVersion{RunningLatest: true}
}
json.NewEncoder(w).Encode(cv)
}
// serveUpdateInstall sends a request to the LocalBackend to start a Tailscale
// self-update. A successful response does not indicate whether the update
// succeeded, only that the request was accepted. Clients should use
// serveUpdateProgress after pinging this endpoint to check how the update is
// going.
func (h *Handler) serveUpdateInstall(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
http.Error(w, "only POST allowed", http.StatusMethodNotAllowed)
return
}
w.WriteHeader(http.StatusAccepted)
go h.b.DoSelfUpdate()
}
// serveUpdateProgress returns the status of an in-progress Tailscale self-update.
// This is provided as a slice of ipnstate.UpdateProgress structs with various
// log messages in order from oldest to newest. If an update is not in progress,
// the returned slice will be empty.
func (h *Handler) serveUpdateProgress(w http.ResponseWriter, r *http.Request) {
if r.Method != "GET" {
http.Error(w, "only GET allowed", http.StatusMethodNotAllowed)
return
}
ups := h.b.GetSelfUpdateProgress()
json.NewEncoder(w).Encode(ups)
}
// serveTailFSFileServerAddr handles updates of the tailfs file server address.
func (h *Handler) serveTailFSFileServerAddr(w http.ResponseWriter, r *http.Request) {
if r.Method != "PUT" {
http.Error(w, "only PUT allowed", http.StatusMethodNotAllowed)
return
}
b, err := io.ReadAll(r.Body)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
h.b.TailFSSetFileServerAddr(string(b))
w.WriteHeader(http.StatusCreated)
}
// serveShares handles the management of tailfs shares.
//
// PUT - adds or updates an existing share
// DELETE - removes a share
// GET - gets a list of all shares, sorted by name
// POST - renames an existing share
func (h *Handler) serveShares(w http.ResponseWriter, r *http.Request) {
if !h.b.TailFSSharingEnabled() {
http.Error(w, `tailfs sharing not enabled, please add the attribute "tailfs:share" to this node in your ACLs' "nodeAttrs" section`, http.StatusForbidden)
return
}
switch r.Method {
case "PUT":
var share tailfs.Share
err := json.NewDecoder(r.Body).Decode(&share)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
share.Path = path.Clean(share.Path)
fi, err := os.Stat(share.Path)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
if !fi.IsDir() {
http.Error(w, "not a directory", http.StatusBadRequest)
return
}
if tailfs.AllowShareAs() {
// share as the connected user
username, err := h.getUsername()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
share.As = username
}
err = h.b.TailFSSetShare(&share)
if err != nil {
if errors.Is(err, ipnlocal.ErrInvalidShareName) {
http.Error(w, "invalid share name", http.StatusBadRequest)
return
}
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusCreated)
case "DELETE":
b, err := io.ReadAll(r.Body)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
err = h.b.TailFSRemoveShare(string(b))
if err != nil {
if os.IsNotExist(err) {
http.Error(w, "share not found", http.StatusNotFound)
return
}
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusNoContent)
case "POST":
var names [2]string
err := json.NewDecoder(r.Body).Decode(&names)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
err = h.b.TailFSRenameShare(names[0], names[1])
if err != nil {
if os.IsNotExist(err) {
http.Error(w, "share not found", http.StatusNotFound)
return
}
if os.IsExist(err) {
http.Error(w, "share name already used", http.StatusBadRequest)
return
}
if errors.Is(err, ipnlocal.ErrInvalidShareName) {
http.Error(w, "invalid share name", http.StatusBadRequest)
return
}
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusNoContent)
case "GET":
shares := h.b.TailFSGetShares()
err := json.NewEncoder(w).Encode(shares)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
default:
http.Error(w, "unsupported method", http.StatusMethodNotAllowed)
}
}
var (
metricInvalidRequests = clientmetric.NewCounter("localapi_invalid_requests")
// User-visible LocalAPI endpoints.
metricFilePutCalls = clientmetric.NewCounter("localapi_file_put")
)