mirror of https://github.com/tailscale/tailscale/
client/web: extract web client from cli package
move the tailscale web client out of the cmd/tailscale/cli package, into a new client/web package. The remaining cli/web.go file is still responsible for parsing CLI flags and such, and then calls into client/web. This will allow the web client to be hooked into from other contexts (for example, from a tsnet server), and provide a dedicated space to add more functionality to this client. Updates tailscale/corp#13775 Signed-off-by: Will Norris <will@tailscale.com>pull/8832/head
Will Norris
1 year ago
committed by
Will Norris
parent
69f1324c9e
commit
f9066ac1f4
@ -0,0 +1,446 @@
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// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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// Package web provides the Tailscale client for web.
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package web
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import (
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"bytes"
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"context"
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"crypto/tls"
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_ "embed"
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"encoding/json"
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"encoding/xml"
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"fmt"
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"html/template"
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"io"
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"log"
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"net/http"
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"net/netip"
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"net/url"
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"os"
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"os/exec"
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"strings"
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"tailscale.com/client/tailscale"
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"tailscale.com/envknob"
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"tailscale.com/ipn"
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"tailscale.com/ipn/ipnstate"
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"tailscale.com/licenses"
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"tailscale.com/net/netutil"
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"tailscale.com/tailcfg"
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"tailscale.com/util/groupmember"
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"tailscale.com/version/distro"
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)
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//go:embed web.html
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var webHTML string
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//go:embed web.css
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var webCSS string
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//go:embed auth-redirect.html
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var authenticationRedirectHTML string
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var tmpl *template.Template
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var localClient tailscale.LocalClient
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func init() {
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tmpl = template.Must(template.New("web.html").Parse(webHTML))
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template.Must(tmpl.New("web.css").Parse(webCSS))
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}
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type tmplData struct {
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Profile tailcfg.UserProfile
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SynologyUser string
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Status string
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DeviceName string
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IP string
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AdvertiseExitNode bool
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AdvertiseRoutes string
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LicensesURL string
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TUNMode bool
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IsSynology bool
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DSMVersion int // 6 or 7, if IsSynology=true
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IsUnraid bool
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UnraidToken string
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IPNVersion string
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}
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type postedData struct {
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AdvertiseRoutes string
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AdvertiseExitNode bool
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Reauthenticate bool
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ForceLogout bool
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}
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// authorize returns the name of the user accessing the web UI after verifying
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// whether the user has access to the web UI. The function will write the
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// error to the provided http.ResponseWriter.
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// Note: This is different from a tailscale user, and is typically the local
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// user on the node.
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func authorize(w http.ResponseWriter, r *http.Request) (string, error) {
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switch distro.Get() {
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case distro.Synology:
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user, err := synoAuthn()
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if err != nil {
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http.Error(w, err.Error(), http.StatusUnauthorized)
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return "", err
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}
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if err := authorizeSynology(user); err != nil {
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http.Error(w, err.Error(), http.StatusForbidden)
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return "", err
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}
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return user, nil
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case distro.QNAP:
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user, resp, err := qnapAuthn(r)
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if err != nil {
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http.Error(w, err.Error(), http.StatusUnauthorized)
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return "", err
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}
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if resp.IsAdmin == 0 {
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http.Error(w, err.Error(), http.StatusForbidden)
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return "", err
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}
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return user, nil
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}
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return "", nil
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}
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// authorizeSynology checks whether the provided user has access to the web UI
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// by consulting the membership of the "administrators" group.
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func authorizeSynology(name string) error {
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yes, err := groupmember.IsMemberOfGroup("administrators", name)
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if err != nil {
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return err
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}
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if !yes {
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return fmt.Errorf("not a member of administrators group")
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}
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return nil
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}
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type qnapAuthResponse struct {
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AuthPassed int `xml:"authPassed"`
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IsAdmin int `xml:"isAdmin"`
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AuthSID string `xml:"authSid"`
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ErrorValue int `xml:"errorValue"`
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}
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func qnapAuthn(r *http.Request) (string, *qnapAuthResponse, error) {
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user, err := r.Cookie("NAS_USER")
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if err != nil {
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return "", nil, err
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}
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token, err := r.Cookie("qtoken")
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if err == nil {
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return qnapAuthnQtoken(r, user.Value, token.Value)
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}
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sid, err := r.Cookie("NAS_SID")
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if err == nil {
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return qnapAuthnSid(r, user.Value, sid.Value)
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}
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return "", nil, fmt.Errorf("not authenticated by any mechanism")
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}
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// qnapAuthnURL returns the auth URL to use by inferring where the UI is
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// running based on the request URL. This is necessary because QNAP has so
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// many options, see https://github.com/tailscale/tailscale/issues/7108
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// and https://github.com/tailscale/tailscale/issues/6903
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func qnapAuthnURL(requestUrl string, query url.Values) string {
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in, err := url.Parse(requestUrl)
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scheme := ""
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host := ""
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if err != nil || in.Scheme == "" {
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log.Printf("Cannot parse QNAP login URL %v", err)
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// try localhost and hope for the best
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scheme = "http"
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host = "localhost"
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} else {
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scheme = in.Scheme
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host = in.Host
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}
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u := url.URL{
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Scheme: scheme,
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Host: host,
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Path: "/cgi-bin/authLogin.cgi",
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RawQuery: query.Encode(),
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}
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return u.String()
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}
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func qnapAuthnQtoken(r *http.Request, user, token string) (string, *qnapAuthResponse, error) {
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query := url.Values{
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"qtoken": []string{token},
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"user": []string{user},
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}
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return qnapAuthnFinish(user, qnapAuthnURL(r.URL.String(), query))
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}
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func qnapAuthnSid(r *http.Request, user, sid string) (string, *qnapAuthResponse, error) {
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query := url.Values{
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"sid": []string{sid},
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}
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return qnapAuthnFinish(user, qnapAuthnURL(r.URL.String(), query))
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}
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func qnapAuthnFinish(user, url string) (string, *qnapAuthResponse, error) {
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// QNAP Force HTTPS mode uses a self-signed certificate. Even importing
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// the QNAP root CA isn't enough, the cert doesn't have a usable CN nor
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// SAN. See https://github.com/tailscale/tailscale/issues/6903
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tr := &http.Transport{
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TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
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}
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client := &http.Client{Transport: tr}
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resp, err := client.Get(url)
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if err != nil {
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return "", nil, err
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}
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defer resp.Body.Close()
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out, err := io.ReadAll(resp.Body)
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if err != nil {
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return "", nil, err
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}
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authResp := &qnapAuthResponse{}
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if err := xml.Unmarshal(out, authResp); err != nil {
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return "", nil, err
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}
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if authResp.AuthPassed == 0 {
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return "", nil, fmt.Errorf("not authenticated")
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}
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return user, authResp, nil
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}
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func synoAuthn() (string, error) {
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cmd := exec.Command("/usr/syno/synoman/webman/modules/authenticate.cgi")
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out, err := cmd.CombinedOutput()
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if err != nil {
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return "", fmt.Errorf("auth: %v: %s", err, out)
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}
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return strings.TrimSpace(string(out)), nil
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}
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func authRedirect(w http.ResponseWriter, r *http.Request) bool {
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if distro.Get() == distro.Synology {
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return synoTokenRedirect(w, r)
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}
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return false
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}
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func synoTokenRedirect(w http.ResponseWriter, r *http.Request) bool {
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if r.Header.Get("X-Syno-Token") != "" {
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return false
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}
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if r.URL.Query().Get("SynoToken") != "" {
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return false
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}
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if r.Method == "POST" && r.FormValue("SynoToken") != "" {
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return false
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}
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// We need a SynoToken for authenticate.cgi.
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// So we tell the client to get one.
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_, _ = fmt.Fprint(w, synoTokenRedirectHTML)
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return true
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}
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const synoTokenRedirectHTML = `<html><body>
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Redirecting with session token...
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<script>
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var serverURL = window.location.protocol + "//" + window.location.host;
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var req = new XMLHttpRequest();
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req.overrideMimeType("application/json");
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req.open("GET", serverURL + "/webman/login.cgi", true);
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req.onload = function() {
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var jsonResponse = JSON.parse(req.responseText);
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var token = jsonResponse["SynoToken"];
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document.location.href = serverURL + "/webman/3rdparty/Tailscale/?SynoToken=" + token;
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};
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req.send(null);
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</script>
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</body></html>
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`
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// Handle processes all requests for the Tailscale web client.
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func Handle(w http.ResponseWriter, r *http.Request) {
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ctx := r.Context()
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if authRedirect(w, r) {
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return
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}
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user, err := authorize(w, r)
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if err != nil {
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return
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}
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if r.URL.Path == "/redirect" || r.URL.Path == "/redirect/" {
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io.WriteString(w, authenticationRedirectHTML)
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return
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}
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st, err := localClient.StatusWithoutPeers(ctx)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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prefs, err := localClient.GetPrefs(ctx)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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if r.Method == "POST" {
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defer r.Body.Close()
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var postData postedData
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type mi map[string]any
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if err := json.NewDecoder(r.Body).Decode(&postData); err != nil {
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w.WriteHeader(400)
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json.NewEncoder(w).Encode(mi{"error": err.Error()})
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return
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}
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routes, err := netutil.CalcAdvertiseRoutes(postData.AdvertiseRoutes, postData.AdvertiseExitNode)
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if err != nil {
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w.WriteHeader(http.StatusInternalServerError)
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json.NewEncoder(w).Encode(mi{"error": err.Error()})
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return
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}
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mp := &ipn.MaskedPrefs{
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AdvertiseRoutesSet: true,
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WantRunningSet: true,
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}
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mp.Prefs.WantRunning = true
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mp.Prefs.AdvertiseRoutes = routes
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log.Printf("Doing edit: %v", mp.Pretty())
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if _, err := localClient.EditPrefs(ctx, mp); err != nil {
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w.WriteHeader(http.StatusInternalServerError)
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json.NewEncoder(w).Encode(mi{"error": err.Error()})
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return
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}
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w.Header().Set("Content-Type", "application/json")
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var reauth, logout bool
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if postData.Reauthenticate {
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reauth = true
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}
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if postData.ForceLogout {
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logout = true
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}
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log.Printf("tailscaleUp(reauth=%v, logout=%v) ...", reauth, logout)
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url, err := tailscaleUp(r.Context(), st, postData)
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log.Printf("tailscaleUp = (URL %v, %v)", url != "", err)
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if err != nil {
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w.WriteHeader(http.StatusInternalServerError)
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json.NewEncoder(w).Encode(mi{"error": err.Error()})
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return
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}
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if url != "" {
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json.NewEncoder(w).Encode(mi{"url": url})
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} else {
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io.WriteString(w, "{}")
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}
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return
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}
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profile := st.User[st.Self.UserID]
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deviceName := strings.Split(st.Self.DNSName, ".")[0]
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versionShort := strings.Split(st.Version, "-")[0]
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data := tmplData{
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SynologyUser: user,
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Profile: profile,
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Status: st.BackendState,
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DeviceName: deviceName,
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LicensesURL: licenses.LicensesURL(),
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TUNMode: st.TUN,
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IsSynology: distro.Get() == distro.Synology || envknob.Bool("TS_FAKE_SYNOLOGY"),
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DSMVersion: distro.DSMVersion(),
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IsUnraid: distro.Get() == distro.Unraid,
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UnraidToken: os.Getenv("UNRAID_CSRF_TOKEN"),
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IPNVersion: versionShort,
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}
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exitNodeRouteV4 := netip.MustParsePrefix("0.0.0.0/0")
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exitNodeRouteV6 := netip.MustParsePrefix("::/0")
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for _, r := range prefs.AdvertiseRoutes {
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if r == exitNodeRouteV4 || r == exitNodeRouteV6 {
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data.AdvertiseExitNode = true
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} else {
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if data.AdvertiseRoutes != "" {
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data.AdvertiseRoutes += ","
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}
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data.AdvertiseRoutes += r.String()
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}
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}
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if len(st.TailscaleIPs) != 0 {
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data.IP = st.TailscaleIPs[0].String()
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}
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buf := new(bytes.Buffer)
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if err := tmpl.Execute(buf, data); err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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w.Write(buf.Bytes())
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}
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func tailscaleUp(ctx context.Context, st *ipnstate.Status, postData postedData) (authURL string, retErr error) {
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if postData.ForceLogout {
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if err := localClient.Logout(ctx); err != nil {
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return "", fmt.Errorf("Logout error: %w", err)
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}
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return "", nil
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}
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origAuthURL := st.AuthURL
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isRunning := st.BackendState == ipn.Running.String()
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forceReauth := postData.Reauthenticate
|
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if !forceReauth {
|
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if origAuthURL != "" {
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return origAuthURL, nil
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}
|
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if isRunning {
|
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return "", nil
|
||||
}
|
||||
}
|
||||
|
||||
// printAuthURL reports whether we should print out the
|
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// provided auth URL from an IPN notify.
|
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printAuthURL := func(url string) bool {
|
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return url != origAuthURL
|
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}
|
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|
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watchCtx, cancelWatch := context.WithCancel(ctx)
|
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defer cancelWatch()
|
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watcher, err := localClient.WatchIPNBus(watchCtx, 0)
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
defer watcher.Close()
|
||||
|
||||
go func() {
|
||||
if !isRunning {
|
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localClient.Start(ctx, ipn.Options{})
|
||||
}
|
||||
if forceReauth {
|
||||
localClient.StartLoginInteractive(ctx)
|
||||
}
|
||||
}()
|
||||
|
||||
for {
|
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n, err := watcher.Next()
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
if n.ErrMessage != nil {
|
||||
msg := *n.ErrMessage
|
||||
return "", fmt.Errorf("backend error: %v", msg)
|
||||
}
|
||||
if url := n.BrowseToURL; url != nil && printAuthURL(*url) {
|
||||
return *url, nil
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,64 @@
|
||||
// Copyright (c) Tailscale Inc & AUTHORS
|
||||
// SPDX-License-Identifier: BSD-3-Clause
|
||||
|
||||
package web
|
||||
|
||||
import (
|
||||
"net/url"
|
||||
"testing"
|
||||
)
|
||||
|
||||
func TestQnapAuthnURL(t *testing.T) {
|
||||
query := url.Values{
|
||||
"qtoken": []string{"token"},
|
||||
}
|
||||
tests := []struct {
|
||||
name string
|
||||
in string
|
||||
want string
|
||||
}{
|
||||
{
|
||||
name: "localhost http",
|
||||
in: "http://localhost:8088/",
|
||||
want: "http://localhost:8088/cgi-bin/authLogin.cgi?qtoken=token",
|
||||
},
|
||||
{
|
||||
name: "localhost https",
|
||||
in: "https://localhost:5000/",
|
||||
want: "https://localhost:5000/cgi-bin/authLogin.cgi?qtoken=token",
|
||||
},
|
||||
{
|
||||
name: "IP http",
|
||||
in: "http://10.1.20.4:80/",
|
||||
want: "http://10.1.20.4:80/cgi-bin/authLogin.cgi?qtoken=token",
|
||||
},
|
||||
{
|
||||
name: "IP6 https",
|
||||
in: "https://[ff7d:0:1:2::1]/",
|
||||
want: "https://[ff7d:0:1:2::1]/cgi-bin/authLogin.cgi?qtoken=token",
|
||||
},
|
||||
{
|
||||
name: "hostname https",
|
||||
in: "https://qnap.example.com/",
|
||||
want: "https://qnap.example.com/cgi-bin/authLogin.cgi?qtoken=token",
|
||||
},
|
||||
{
|
||||
name: "invalid URL",
|
||||
in: "This is not a URL, it is a really really really really really really really really really really really really long string to exercise the URL truncation code in the error path.",
|
||||
want: "http://localhost/cgi-bin/authLogin.cgi?qtoken=token",
|
||||
},
|
||||
{
|
||||
name: "err != nil",
|
||||
in: "http://192.168.0.%31/",
|
||||
want: "http://localhost/cgi-bin/authLogin.cgi?qtoken=token",
|
||||
},
|
||||
}
|
||||
for _, tt := range tests {
|
||||
t.Run(tt.name, func(t *testing.T) {
|
||||
u := qnapAuthnURL(tt.in, query)
|
||||
if u != tt.want {
|
||||
t.Errorf("expected url: %q, got: %q", tt.want, u)
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue