mirror of
https://github.com/tailscale/tailscale.git
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f0347e841f
The io/ioutil package has been deprecated as of Go 1.16 [1]. This commit replaces the existing io/ioutil functions with their new definitions in io and os packages. Reference: https://golang.org/doc/go1.16#ioutil Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>
647 lines
19 KiB
Go
647 lines
19 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package ipn
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import (
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"bytes"
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"encoding/json"
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"errors"
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"fmt"
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"log"
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"net/netip"
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"os"
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"path/filepath"
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"reflect"
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"runtime"
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"strings"
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"tailscale.com/atomicfile"
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"tailscale.com/ipn/ipnstate"
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"tailscale.com/net/netaddr"
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"tailscale.com/net/tsaddr"
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"tailscale.com/tailcfg"
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"tailscale.com/types/persist"
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"tailscale.com/types/preftype"
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"tailscale.com/util/dnsname"
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)
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//go:generate go run tailscale.com/cmd/cloner -type=Prefs
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// DefaultControlURL is the URL base of the control plane
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// ("coordination server") for use when no explicit one is configured.
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// The default control plane is the hosted version run by Tailscale.com.
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const DefaultControlURL = "https://controlplane.tailscale.com"
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var (
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// ErrExitNodeIDAlreadySet is returned from (*Prefs).SetExitNodeIP when the
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// Prefs.ExitNodeID field is already set.
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ErrExitNodeIDAlreadySet = errors.New("cannot set ExitNodeIP when ExitNodeID is already set")
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)
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// IsLoginServerSynonym reports whether a URL is a drop-in replacement
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// for the primary Tailscale login server.
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func IsLoginServerSynonym(val any) bool {
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return val == "https://login.tailscale.com" || val == "https://controlplane.tailscale.com"
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}
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// Prefs are the user modifiable settings of the Tailscale node agent.
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type Prefs struct {
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// ControlURL is the URL of the control server to use.
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//
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// If empty, the default for new installs, DefaultControlURL
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// is used. It's set non-empty once the daemon has been started
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// for the first time.
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//
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// TODO(apenwarr): Make it safe to update this with SetPrefs().
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// Right now, you have to pass it in the initial prefs in Start(),
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// which is the only code that actually uses the ControlURL value.
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// It would be more consistent to restart controlclient
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// automatically whenever this variable changes.
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//
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// Meanwhile, you have to provide this as part of Options.Prefs or
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// Options.UpdatePrefs when calling Backend.Start().
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ControlURL string
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// RouteAll specifies whether to accept subnets advertised by
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// other nodes on the Tailscale network. Note that this does not
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// include default routes (0.0.0.0/0 and ::/0), those are
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// controlled by ExitNodeID/IP below.
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RouteAll bool
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// AllowSingleHosts specifies whether to install routes for each
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// node IP on the tailscale network, in addition to a route for
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// the whole network.
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// This corresponds to the "tailscale up --host-routes" value,
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// which defaults to true.
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//
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// TODO(danderson): why do we have this? It dumps a lot of stuff
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// into the routing table, and a single network route _should_ be
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// all that we need. But when I turn this off in my tailscaled,
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// packets stop flowing. What's up with that?
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AllowSingleHosts bool
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// ExitNodeID and ExitNodeIP specify the node that should be used
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// as an exit node for internet traffic. At most one of these
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// should be non-zero.
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//
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// The preferred way to express the chosen node is ExitNodeID, but
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// in some cases it's not possible to use that ID (e.g. in the
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// linux CLI, before tailscaled has a netmap). For those
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// situations, we allow specifying the exit node by IP, and
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// ipnlocal.LocalBackend will translate the IP into an ID when the
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// node is found in the netmap.
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//
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// If the selected exit node doesn't exist (e.g. it's not part of
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// the current tailnet), or it doesn't offer exit node services, a
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// blackhole route will be installed on the local system to
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// prevent any traffic escaping to the local network.
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ExitNodeID tailcfg.StableNodeID
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ExitNodeIP netip.Addr
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// ExitNodeAllowLANAccess indicates whether locally accessible subnets should be
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// routed directly or via the exit node.
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ExitNodeAllowLANAccess bool
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// CorpDNS specifies whether to install the Tailscale network's
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// DNS configuration, if it exists.
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CorpDNS bool
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// RunSSH bool is whether this node should run an SSH
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// server, permitting access to peers according to the
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// policies as configured by the Tailnet's admin(s).
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RunSSH bool
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// WantRunning indicates whether networking should be active on
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// this node.
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WantRunning bool
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// LoggedOut indicates whether the user intends to be logged out.
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// There are other reasons we may be logged out, including no valid
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// keys.
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// We need to remember this state so that, on next startup, we can
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// generate the "Login" vs "Connect" buttons correctly, without having
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// to contact the server to confirm our nodekey status first.
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LoggedOut bool
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// ShieldsUp indicates whether to block all incoming connections,
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// regardless of the control-provided packet filter. If false, we
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// use the packet filter as provided. If true, we block incoming
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// connections. This overrides tailcfg.Hostinfo's ShieldsUp.
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ShieldsUp bool
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// AdvertiseTags specifies groups that this node wants to join, for
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// purposes of ACL enforcement. These can be referenced from the ACL
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// security policy. Note that advertising a tag doesn't guarantee that
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// the control server will allow you to take on the rights for that
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// tag.
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AdvertiseTags []string
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// Hostname is the hostname to use for identifying the node. If
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// not set, os.Hostname is used.
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Hostname string
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// NotepadURLs is a debugging setting that opens OAuth URLs in
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// notepad.exe on Windows, rather than loading them in a browser.
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//
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// apenwarr 2020-04-29: Unfortunately this is still needed sometimes.
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// Windows' default browser setting is sometimes screwy and this helps
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// users narrow it down a bit.
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NotepadURLs bool
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// ForceDaemon specifies whether a platform that normally
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// operates in "client mode" (that is, requires an active user
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// logged in with the GUI app running) should keep running after the
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// GUI ends and/or the user logs out.
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//
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// The only current applicable platform is Windows. This
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// forced Windows to go into "server mode" where Tailscale is
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// running even with no users logged in. This might also be
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// used for macOS in the future. This setting has no effect
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// for Linux/etc, which always operate in daemon mode.
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ForceDaemon bool `json:"ForceDaemon,omitempty"`
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// Egg is a optional debug flag.
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Egg bool
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// The following block of options only have an effect on Linux.
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// AdvertiseRoutes specifies CIDR prefixes to advertise into the
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// Tailscale network as reachable through the current
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// node.
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AdvertiseRoutes []netip.Prefix
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// NoSNAT specifies whether to source NAT traffic going to
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// destinations in AdvertiseRoutes. The default is to apply source
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// NAT, which makes the traffic appear to come from the router
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// machine rather than the peer's Tailscale IP.
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//
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// Disabling SNAT requires additional manual configuration in your
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// network to route Tailscale traffic back to the subnet relay
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// machine.
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//
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// Linux-only.
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NoSNAT bool
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// NetfilterMode specifies how much to manage netfilter rules for
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// Tailscale, if at all.
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NetfilterMode preftype.NetfilterMode
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// OperatorUser is the local machine user name who is allowed to
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// operate tailscaled without being root or using sudo.
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OperatorUser string `json:",omitempty"`
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// The Persist field is named 'Config' in the file for backward
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// compatibility with earlier versions.
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// TODO(apenwarr): We should move this out of here, it's not a pref.
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// We can maybe do that once we're sure which module should persist
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// it (backend or frontend?)
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Persist *persist.Persist `json:"Config"`
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}
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// MaskedPrefs is a Prefs with an associated bitmask of which fields are set.
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type MaskedPrefs struct {
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Prefs
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ControlURLSet bool `json:",omitempty"`
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RouteAllSet bool `json:",omitempty"`
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AllowSingleHostsSet bool `json:",omitempty"`
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ExitNodeIDSet bool `json:",omitempty"`
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ExitNodeIPSet bool `json:",omitempty"`
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ExitNodeAllowLANAccessSet bool `json:",omitempty"`
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CorpDNSSet bool `json:",omitempty"`
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RunSSHSet bool `json:",omitempty"`
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WantRunningSet bool `json:",omitempty"`
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LoggedOutSet bool `json:",omitempty"`
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ShieldsUpSet bool `json:",omitempty"`
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AdvertiseTagsSet bool `json:",omitempty"`
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HostnameSet bool `json:",omitempty"`
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NotepadURLsSet bool `json:",omitempty"`
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ForceDaemonSet bool `json:",omitempty"`
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EggSet bool `json:",omitempty"`
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AdvertiseRoutesSet bool `json:",omitempty"`
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NoSNATSet bool `json:",omitempty"`
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NetfilterModeSet bool `json:",omitempty"`
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OperatorUserSet bool `json:",omitempty"`
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}
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// ApplyEdits mutates p, assigning fields from m.Prefs for each MaskedPrefs
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// Set field that's true.
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func (p *Prefs) ApplyEdits(m *MaskedPrefs) {
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if p == nil {
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panic("can't edit nil Prefs")
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}
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pv := reflect.ValueOf(p).Elem()
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mv := reflect.ValueOf(m).Elem()
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mpv := reflect.ValueOf(&m.Prefs).Elem()
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fields := mv.NumField()
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for i := 1; i < fields; i++ {
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if mv.Field(i).Bool() {
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newFieldValue := mpv.Field(i - 1)
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pv.Field(i - 1).Set(newFieldValue)
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}
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}
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}
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func (m *MaskedPrefs) Pretty() string {
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if m == nil {
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return "MaskedPrefs{<nil>}"
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}
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var sb strings.Builder
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sb.WriteString("MaskedPrefs{")
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mv := reflect.ValueOf(m).Elem()
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mt := mv.Type()
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mpv := reflect.ValueOf(&m.Prefs).Elem()
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first := true
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format := func(v reflect.Value) string {
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switch v.Type().Kind() {
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case reflect.String:
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return "%s=%q"
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case reflect.Slice:
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// []string
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if v.Type().Elem().Kind() == reflect.String {
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return "%s=%q"
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}
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}
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return "%s=%v"
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}
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for i := 1; i < mt.NumField(); i++ {
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name := mt.Field(i).Name
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if mv.Field(i).Bool() {
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if !first {
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sb.WriteString(" ")
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}
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first = false
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f := mpv.Field(i - 1)
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fmt.Fprintf(&sb, format(f),
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strings.TrimSuffix(name, "Set"),
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f.Interface())
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}
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}
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sb.WriteString("}")
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return sb.String()
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}
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// IsEmpty reports whether p is nil or pointing to a Prefs zero value.
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func (p *Prefs) IsEmpty() bool { return p == nil || p.Equals(&Prefs{}) }
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func (p *Prefs) Pretty() string { return p.pretty(runtime.GOOS) }
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func (p *Prefs) pretty(goos string) string {
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var sb strings.Builder
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sb.WriteString("Prefs{")
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fmt.Fprintf(&sb, "ra=%v ", p.RouteAll)
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if !p.AllowSingleHosts {
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sb.WriteString("mesh=false ")
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}
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fmt.Fprintf(&sb, "dns=%v want=%v ", p.CorpDNS, p.WantRunning)
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if p.RunSSH {
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sb.WriteString("ssh=true ")
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}
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if p.LoggedOut {
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sb.WriteString("loggedout=true ")
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}
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if p.ForceDaemon {
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sb.WriteString("server=true ")
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}
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if p.NotepadURLs {
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sb.WriteString("notepad=true ")
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}
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if p.ShieldsUp {
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sb.WriteString("shields=true ")
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}
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if p.ExitNodeIP.IsValid() {
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fmt.Fprintf(&sb, "exit=%v lan=%t ", p.ExitNodeIP, p.ExitNodeAllowLANAccess)
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} else if !p.ExitNodeID.IsZero() {
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fmt.Fprintf(&sb, "exit=%v lan=%t ", p.ExitNodeID, p.ExitNodeAllowLANAccess)
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}
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if len(p.AdvertiseRoutes) > 0 || goos == "linux" {
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fmt.Fprintf(&sb, "routes=%v ", p.AdvertiseRoutes)
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}
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if len(p.AdvertiseRoutes) > 0 || p.NoSNAT {
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fmt.Fprintf(&sb, "snat=%v ", !p.NoSNAT)
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}
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if len(p.AdvertiseTags) > 0 {
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fmt.Fprintf(&sb, "tags=%s ", strings.Join(p.AdvertiseTags, ","))
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}
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if goos == "linux" {
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fmt.Fprintf(&sb, "nf=%v ", p.NetfilterMode)
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}
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if p.ControlURL != "" && p.ControlURL != DefaultControlURL {
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fmt.Fprintf(&sb, "url=%q ", p.ControlURL)
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}
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if p.Hostname != "" {
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fmt.Fprintf(&sb, "host=%q ", p.Hostname)
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}
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if p.OperatorUser != "" {
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fmt.Fprintf(&sb, "op=%q ", p.OperatorUser)
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}
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if p.Persist != nil {
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sb.WriteString(p.Persist.Pretty())
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} else {
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sb.WriteString("Persist=nil")
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}
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sb.WriteString("}")
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return sb.String()
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}
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func (p *Prefs) ToBytes() []byte {
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data, err := json.MarshalIndent(p, "", "\t")
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if err != nil {
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log.Fatalf("Prefs marshal: %v\n", err)
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}
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return data
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}
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func (p *Prefs) Equals(p2 *Prefs) bool {
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if p == nil && p2 == nil {
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return true
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}
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if p == nil || p2 == nil {
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return false
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}
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return p != nil && p2 != nil &&
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p.ControlURL == p2.ControlURL &&
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p.RouteAll == p2.RouteAll &&
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p.AllowSingleHosts == p2.AllowSingleHosts &&
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p.ExitNodeID == p2.ExitNodeID &&
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p.ExitNodeIP == p2.ExitNodeIP &&
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p.ExitNodeAllowLANAccess == p2.ExitNodeAllowLANAccess &&
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p.CorpDNS == p2.CorpDNS &&
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p.RunSSH == p2.RunSSH &&
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p.WantRunning == p2.WantRunning &&
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p.LoggedOut == p2.LoggedOut &&
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p.NotepadURLs == p2.NotepadURLs &&
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p.ShieldsUp == p2.ShieldsUp &&
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p.NoSNAT == p2.NoSNAT &&
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p.NetfilterMode == p2.NetfilterMode &&
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p.OperatorUser == p2.OperatorUser &&
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p.Hostname == p2.Hostname &&
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p.ForceDaemon == p2.ForceDaemon &&
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compareIPNets(p.AdvertiseRoutes, p2.AdvertiseRoutes) &&
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compareStrings(p.AdvertiseTags, p2.AdvertiseTags) &&
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p.Persist.Equals(p2.Persist)
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}
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func compareIPNets(a, b []netip.Prefix) bool {
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if len(a) != len(b) {
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return false
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}
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for i := range a {
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if a[i] != b[i] {
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return false
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}
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}
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return true
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}
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func compareStrings(a, b []string) bool {
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if len(a) != len(b) {
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return false
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}
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for i := range a {
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if a[i] != b[i] {
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return false
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}
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}
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return true
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}
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// NewPrefs returns the default preferences to use.
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func NewPrefs() *Prefs {
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// Provide default values for options which might be missing
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// from the json data for any reason. The json can still
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// override them to false.
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return &Prefs{
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// ControlURL is explicitly not set to signal that
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// it's not yet configured, which relaxes the CLI "up"
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// safety net features. It will get set to DefaultControlURL
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// on first up. Or, if not, DefaultControlURL will be used
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// later anyway.
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ControlURL: "",
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RouteAll: true,
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AllowSingleHosts: true,
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CorpDNS: true,
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WantRunning: false,
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NetfilterMode: preftype.NetfilterOn,
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}
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}
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// ControlURLOrDefault returns the coordination server's URL base.
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//
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// If not configured, or if the configured value is a legacy name equivalent to
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// the default, then DefaultControlURL is returned instead.
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func (p *Prefs) ControlURLOrDefault() string {
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if p.ControlURL != "" {
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if p.ControlURL != DefaultControlURL && IsLoginServerSynonym(p.ControlURL) {
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return DefaultControlURL
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}
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return p.ControlURL
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}
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return DefaultControlURL
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}
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// AdminPageURL returns the admin web site URL for the current ControlURL.
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func (p *Prefs) AdminPageURL() string {
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url := p.ControlURLOrDefault()
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if IsLoginServerSynonym(url) {
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// TODO(crawshaw): In future release, make this https://console.tailscale.com
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url = "https://login.tailscale.com"
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}
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return url + "/admin/machines"
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}
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// AdvertisesExitNode reports whether p is advertising both the v4 and
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// v6 /0 exit node routes.
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func (p *Prefs) AdvertisesExitNode() bool {
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if p == nil {
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return false
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}
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return tsaddr.ContainsExitRoutes(p.AdvertiseRoutes)
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}
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// SetAdvertiseExitNode mutates p (if non-nil) to add or remove the two
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// /0 exit node routes.
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func (p *Prefs) SetAdvertiseExitNode(runExit bool) {
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if p == nil {
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return
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}
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all := p.AdvertiseRoutes
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p.AdvertiseRoutes = p.AdvertiseRoutes[:0]
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for _, r := range all {
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if r.Bits() != 0 {
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p.AdvertiseRoutes = append(p.AdvertiseRoutes, r)
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}
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}
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if !runExit {
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return
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}
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p.AdvertiseRoutes = append(p.AdvertiseRoutes,
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netip.PrefixFrom(netaddr.IPv4(0, 0, 0, 0), 0),
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netip.PrefixFrom(netip.IPv6Unspecified(), 0))
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}
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// peerWithTailscaleIP returns the peer in st with the provided
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// Tailscale IP.
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func peerWithTailscaleIP(st *ipnstate.Status, ip netip.Addr) (ps *ipnstate.PeerStatus, ok bool) {
|
|
for _, ps := range st.Peer {
|
|
for _, ip2 := range ps.TailscaleIPs {
|
|
if ip == ip2 {
|
|
return ps, true
|
|
}
|
|
}
|
|
}
|
|
return nil, false
|
|
}
|
|
|
|
func isRemoteIP(st *ipnstate.Status, ip netip.Addr) bool {
|
|
for _, selfIP := range st.TailscaleIPs {
|
|
if ip == selfIP {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// ClearExitNode sets the ExitNodeID and ExitNodeIP to their zero values.
|
|
func (p *Prefs) ClearExitNode() {
|
|
p.ExitNodeID = ""
|
|
p.ExitNodeIP = netip.Addr{}
|
|
}
|
|
|
|
// ExitNodeLocalIPError is returned when the requested IP address for an exit
|
|
// node belongs to the local machine.
|
|
type ExitNodeLocalIPError struct {
|
|
hostOrIP string
|
|
}
|
|
|
|
func (e ExitNodeLocalIPError) Error() string {
|
|
return fmt.Sprintf("cannot use %s as an exit node as it is a local IP address to this machine", e.hostOrIP)
|
|
}
|
|
|
|
func exitNodeIPOfArg(s string, st *ipnstate.Status) (ip netip.Addr, err error) {
|
|
if s == "" {
|
|
return ip, os.ErrInvalid
|
|
}
|
|
ip, err = netip.ParseAddr(s)
|
|
if err == nil {
|
|
// If we're online already and have a netmap, double check that the IP
|
|
// address specified is valid.
|
|
if st.BackendState == "Running" {
|
|
ps, ok := peerWithTailscaleIP(st, ip)
|
|
if !ok {
|
|
return ip, fmt.Errorf("no node found in netmap with IP %v", ip)
|
|
}
|
|
if !ps.ExitNodeOption {
|
|
return ip, fmt.Errorf("node %v is not advertising an exit node", ip)
|
|
}
|
|
}
|
|
if !isRemoteIP(st, ip) {
|
|
return ip, ExitNodeLocalIPError{s}
|
|
}
|
|
return ip, nil
|
|
}
|
|
match := 0
|
|
for _, ps := range st.Peer {
|
|
baseName := dnsname.TrimSuffix(ps.DNSName, st.MagicDNSSuffix)
|
|
if !strings.EqualFold(s, baseName) {
|
|
continue
|
|
}
|
|
match++
|
|
if len(ps.TailscaleIPs) == 0 {
|
|
return ip, fmt.Errorf("node %q has no Tailscale IP?", s)
|
|
}
|
|
if !ps.ExitNodeOption {
|
|
return ip, fmt.Errorf("node %q is not advertising an exit node", s)
|
|
}
|
|
ip = ps.TailscaleIPs[0]
|
|
}
|
|
switch match {
|
|
case 0:
|
|
return ip, fmt.Errorf("invalid value %q for --exit-node; must be IP or unique node name", s)
|
|
case 1:
|
|
if !isRemoteIP(st, ip) {
|
|
return ip, ExitNodeLocalIPError{s}
|
|
}
|
|
return ip, nil
|
|
default:
|
|
return ip, fmt.Errorf("ambiguous exit node name %q", s)
|
|
}
|
|
}
|
|
|
|
// SetExitNodeIP validates and sets the ExitNodeIP from a user-provided string
|
|
// specifying either an IP address or a MagicDNS base name ("foo", as opposed to
|
|
// "foo.bar.beta.tailscale.net"). This method does not mutate ExitNodeID and
|
|
// will fail if ExitNodeID is already set.
|
|
func (p *Prefs) SetExitNodeIP(s string, st *ipnstate.Status) error {
|
|
if !p.ExitNodeID.IsZero() {
|
|
return ErrExitNodeIDAlreadySet
|
|
}
|
|
ip, err := exitNodeIPOfArg(s, st)
|
|
if err == nil {
|
|
p.ExitNodeIP = ip
|
|
}
|
|
return err
|
|
}
|
|
|
|
// ShouldSSHBeRunning reports whether the SSH server should be running based on
|
|
// the prefs.
|
|
func (p *Prefs) ShouldSSHBeRunning() bool {
|
|
return p.WantRunning && p.RunSSH
|
|
}
|
|
|
|
// PrefsFromBytes deserializes Prefs from a JSON blob.
|
|
func PrefsFromBytes(b []byte) (*Prefs, error) {
|
|
p := NewPrefs()
|
|
if len(b) == 0 {
|
|
return p, nil
|
|
}
|
|
persist := &persist.Persist{}
|
|
err := json.Unmarshal(b, persist)
|
|
if err == nil && (persist.Provider != "" || persist.LoginName != "") {
|
|
// old-style relaynode config; import it
|
|
p.Persist = persist
|
|
} else {
|
|
err = json.Unmarshal(b, &p)
|
|
if err != nil {
|
|
log.Printf("Prefs parse: %v: %v\n", err, b)
|
|
}
|
|
}
|
|
return p, err
|
|
}
|
|
|
|
// LoadPrefs loads a legacy relaynode config file into Prefs
|
|
// with sensible migration defaults set.
|
|
func LoadPrefs(filename string) (*Prefs, error) {
|
|
data, err := os.ReadFile(filename)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("LoadPrefs open: %w", err) // err includes path
|
|
}
|
|
if bytes.Contains(data, jsonEscapedZero) {
|
|
// Tailscale 1.2.0 - 1.2.8 on Windows had a memory corruption bug
|
|
// in the backend process that ended up sending NULL bytes over JSON
|
|
// to the frontend which wrote them out to JSON files on disk.
|
|
// So if we see one, treat is as corrupt and the user will need
|
|
// to log in again. (better than crashing)
|
|
return nil, os.ErrNotExist
|
|
}
|
|
p, err := PrefsFromBytes(data)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("LoadPrefs(%q) decode: %w", filename, err)
|
|
}
|
|
return p, nil
|
|
}
|
|
|
|
func SavePrefs(filename string, p *Prefs) {
|
|
log.Printf("Saving prefs %v %v\n", filename, p.Pretty())
|
|
data := p.ToBytes()
|
|
os.MkdirAll(filepath.Dir(filename), 0700)
|
|
if err := atomicfile.WriteFile(filename, data, 0600); err != nil {
|
|
log.Printf("SavePrefs: %v\n", err)
|
|
}
|
|
}
|