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da40609abd
Fixes #13313 Fixes #12687 Signed-off-by: Nick Khyl <nickk@tailscale.com>
144 lines
4.5 KiB
Go
144 lines
4.5 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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// Package syspolicy provides functions to retrieve system settings of a device.
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package syspolicy
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import (
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"errors"
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"time"
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"tailscale.com/util/syspolicy/internal/loggerx"
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"tailscale.com/util/syspolicy/setting"
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)
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func GetString(key Key, defaultValue string) (string, error) {
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markHandlerInUse()
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v, err := handler.ReadString(string(key))
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if errors.Is(err, ErrNoSuchKey) {
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return defaultValue, nil
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}
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return v, err
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}
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func GetUint64(key Key, defaultValue uint64) (uint64, error) {
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markHandlerInUse()
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v, err := handler.ReadUInt64(string(key))
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if errors.Is(err, ErrNoSuchKey) {
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return defaultValue, nil
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}
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return v, err
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}
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func GetBoolean(key Key, defaultValue bool) (bool, error) {
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markHandlerInUse()
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v, err := handler.ReadBoolean(string(key))
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if errors.Is(err, ErrNoSuchKey) {
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return defaultValue, nil
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}
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return v, err
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}
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func GetStringArray(key Key, defaultValue []string) ([]string, error) {
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markHandlerInUse()
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v, err := handler.ReadStringArray(string(key))
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if errors.Is(err, ErrNoSuchKey) {
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return defaultValue, nil
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}
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return v, err
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}
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// GetPreferenceOption loads a policy from the registry that can be
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// managed by an enterprise policy management system and allows administrative
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// overrides of users' choices in a way that we do not want tailcontrol to have
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// the authority to set. It describes user-decides/always/never options, where
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// "always" and "never" remove the user's ability to make a selection. If not
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// present or set to a different value, "user-decides" is the default.
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func GetPreferenceOption(name Key) (setting.PreferenceOption, error) {
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s, err := GetString(name, "user-decides")
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if err != nil {
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return setting.ShowChoiceByPolicy, err
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}
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var opt setting.PreferenceOption
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err = opt.UnmarshalText([]byte(s))
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return opt, err
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}
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// GetVisibility loads a policy from the registry that can be managed
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// by an enterprise policy management system and describes show/hide decisions
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// for UI elements. The registry value should be a string set to "show" (return
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// true) or "hide" (return true). If not present or set to a different value,
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// "show" (return false) is the default.
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func GetVisibility(name Key) (setting.Visibility, error) {
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s, err := GetString(name, "show")
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if err != nil {
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return setting.VisibleByPolicy, err
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}
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var visibility setting.Visibility
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visibility.UnmarshalText([]byte(s))
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return visibility, nil
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}
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// GetDuration loads a policy from the registry that can be managed
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// by an enterprise policy management system and describes a duration for some
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// action. The registry value should be a string that time.ParseDuration
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// understands. If the registry value is "" or can not be processed,
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// defaultValue is returned instead.
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func GetDuration(name Key, defaultValue time.Duration) (time.Duration, error) {
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opt, err := GetString(name, "")
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if opt == "" || err != nil {
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return defaultValue, err
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}
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v, err := time.ParseDuration(opt)
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if err != nil || v < 0 {
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return defaultValue, nil
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}
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return v, nil
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}
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// SelectControlURL returns the ControlURL to use based on a value in
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// the registry (LoginURL) and the one on disk (in the GUI's
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// prefs.conf). If both are empty, it returns a default value. (It
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// always return a non-empty value)
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//
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// See https://github.com/tailscale/tailscale/issues/2798 for some background.
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func SelectControlURL(reg, disk string) string {
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const def = "https://controlplane.tailscale.com"
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// Prior to Dec 2020's commit 739b02e6, the installer
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// wrote a LoginURL value of https://login.tailscale.com to the registry.
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const oldRegDef = "https://login.tailscale.com"
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// If they have an explicit value in the registry, use it,
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// unless it's an old default value from an old installer.
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// Then we have to see which is better.
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if reg != "" {
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if reg != oldRegDef {
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// Something explicit in the registry that we didn't
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// set ourselves by the installer.
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return reg
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}
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if disk == "" {
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// Something in the registry is better than nothing on disk.
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return reg
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}
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if disk != def && disk != oldRegDef {
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// The value in the registry is the old
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// default (login.tailscale.com) but the value
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// on disk is neither our old nor new default
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// value, so it must be some custom thing that
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// the user cares about. Prefer the disk value.
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return disk
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}
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}
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if disk != "" {
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return disk
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}
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return def
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}
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// SetDebugLoggingEnabled controls whether spammy debug logging is enabled.
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func SetDebugLoggingEnabled(v bool) {
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loggerx.SetDebugLoggingEnabled(v)
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}
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