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60 lines
1.5 KiB
Go
60 lines
1.5 KiB
Go
// 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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"errors"
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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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// authorizeSynology authenticates the logged-in Synology user and verifies
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// that they are authorized to use the web client.
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// If the user is authenticated, but not authorized to use the client, an error is returned.
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func authorizeSynology(r *http.Request) (authorized bool, err error) {
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if !hasSynoToken(r) {
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return false, nil
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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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return false, fmt.Errorf("auth: %v: %s", err, out)
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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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return false, err
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}
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if !isAdmin {
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return false, errors.New("not a member of administrators group")
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}
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return true, nil
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}
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// hasSynoToken returns true if the request include a SynoToken used for synology auth.
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func hasSynoToken(r *http.Request) bool {
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if r.Header.Get("X-Syno-Token") != "" {
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return true
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}
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if r.URL.Query().Get("SynoToken") != "" {
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return true
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}
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if r.Method == "POST" && r.FormValue("SynoToken") != "" {
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return true
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}
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return false
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}
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