2023-08-24 19:12:08 +00:00
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// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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// synology.go contains handlers and logic, such as authentication,
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// that is specific to running the web client on Synology.
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package web
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import (
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"fmt"
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"net/http"
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"os/exec"
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"strings"
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"tailscale.com/util/groupmember"
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)
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2023-08-24 19:56:09 +00:00
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const synologyPrefix = "/webman/3rdparty/Tailscale/index.cgi/"
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2023-08-24 19:46:51 +00:00
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// authorizeSynology authenticates the logged-in Synology user and verifies
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// that they are authorized to use the web client. It returns true if the
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// request was handled and no further processing is required.
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func authorizeSynology(w http.ResponseWriter, r *http.Request) (handled bool) {
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if synoTokenRedirect(w, r) {
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return true
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}
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// authenticate the Synology user
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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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http.Error(w, fmt.Sprintf("auth: %v: %s", err, out), http.StatusUnauthorized)
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return true
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}
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user := strings.TrimSpace(string(out))
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// check if the user is in the administrators group
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isAdmin, err := groupmember.IsMemberOfGroup("administrators", user)
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if err != nil {
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http.Error(w, err.Error(), http.StatusForbidden)
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return true
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}
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if !isAdmin {
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http.Error(w, "not a member of administrators group", http.StatusForbidden)
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return true
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}
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return false
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}
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2023-08-24 19:12:08 +00:00
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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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2023-08-24 19:46:51 +00:00
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const synoTokenRedirectHTML = `<html>
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2023-08-24 19:12:08 +00:00
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Redirecting with session token...
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<script>
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2023-08-24 19:46:51 +00:00
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fetch("/webman/login.cgi")
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.then(r => r.json())
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.then(data => {
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u = new URL(window.location)
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u.searchParams.set("SynoToken", data.SynoToken)
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document.location = u
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})
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2023-08-24 19:12:08 +00:00
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</script>
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`
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