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e3d6236606
errors Updates tailscale/corp#14879 Signed-off-by: Claire Wang <claire@tailscale.com>
156 lines
4.9 KiB
Go
156 lines
4.9 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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// Package policy contains higher-level abstractions for accessing Windows enterprise policies.
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package policy
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import (
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"time"
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"tailscale.com/util/winutil"
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)
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// PreferenceOptionPolicy is a policy that governs whether a boolean variable
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// is forcibly assigned an administrator-defined value, or allowed to receive
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// a user-defined value.
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type PreferenceOptionPolicy int
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const (
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showChoiceByPolicy PreferenceOptionPolicy = iota
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neverByPolicy
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alwaysByPolicy
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)
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// Show returns if the UI option that controls the choice administered by this
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// policy should be shown. Currently this is true if and only if the policy is
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// showChoiceByPolicy.
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func (p PreferenceOptionPolicy) Show() bool {
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return p == showChoiceByPolicy
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}
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// ShouldEnable checks if the choice administered by this policy should be
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// enabled. If the administrator has chosen a setting, the administrator's
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// setting is returned, otherwise userChoice is returned.
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func (p PreferenceOptionPolicy) ShouldEnable(userChoice bool) bool {
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switch p {
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case neverByPolicy:
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return false
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case alwaysByPolicy:
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return true
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default:
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return userChoice
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}
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}
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// GetPreferenceOptionPolicy 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 GetPreferenceOptionPolicy(name string) PreferenceOptionPolicy {
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opt, err := winutil.GetPolicyString(name)
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if opt == "" || err != nil {
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return showChoiceByPolicy
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}
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switch opt {
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case "always":
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return alwaysByPolicy
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case "never":
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return neverByPolicy
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default:
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return showChoiceByPolicy
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}
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}
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// VisibilityPolicy is a policy that controls whether or not a particular
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// component of a user interface is to be shown.
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type VisibilityPolicy byte
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const (
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visibleByPolicy VisibilityPolicy = 'v'
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hiddenByPolicy VisibilityPolicy = 'h'
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)
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// Show reports whether the UI option administered by this policy should be shown.
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// Currently this is true if and only if the policy is visibleByPolicy.
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func (p VisibilityPolicy) Show() bool {
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return p == visibleByPolicy
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}
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// GetVisibilityPolicy 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 GetVisibilityPolicy(name string) VisibilityPolicy {
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opt, err := winutil.GetPolicyString(name)
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if opt == "" || err != nil {
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return visibleByPolicy
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}
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switch opt {
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case "hide":
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return hiddenByPolicy
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default:
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return visibleByPolicy
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}
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}
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// GetDurationPolicy 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 GetDurationPolicy(name string, defaultValue time.Duration) time.Duration {
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opt, err := winutil.GetPolicyString(name)
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if opt == "" || err != nil {
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return defaultValue
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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
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}
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return v
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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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