tailcfg

package
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Published: Nov 3, 2020 License: BSD-3-Clause Imports: 15 Imported by: 181

Documentation

Index

Constants

View Source
const (
	CapRead  = CapType("read")
	CapWrite = CapType("write")
)
View Source
const (
	MachineUnknown      = MachineStatus(iota)
	MachineUnauthorized // server has yet to approve
	MachineAuthorized   // server has approved
	MachineInvalid      // server has explicitly rejected this machine key
)
View Source
const (
	TCP = ServiceProto("tcp")
	UDP = ServiceProto("udp")
)

Variables

View Source
var FilterAllowAll = []FilterRule{
	{
		SrcIPs:  []string{"*"},
		SrcBits: nil,
		DstPorts: []NetPortRange{{
			IP:    "*",
			Bits:  nil,
			Ports: PortRange{0, 65535},
		}},
	},
}
View Source
var PortRangeAny = PortRange{0, 65535}

Functions

func CheckTag added in v0.98.1

func CheckTag(tag string) error

CheckTag valids whether a given string can be used as an ACL tag. For now we allow only ascii alphanumeric tags, and they need to start with a letter. No unicode shenanigans allowed, and we reserve punctuation marks other than '-' for a possible future URI scheme.

Because we're ignoring unicode entirely, we can treat utf-8 as a series of bytes. Anything >= 128 is disqualified anyway.

We might relax these rules later.

func CheckTagSuffix added in v1.2.0

func CheckTagSuffix(tag string) error

CheckTagSuffix checks whether tag is a valid tag suffix (the part appearing after "tag:"). The error message does not reference "tag:", so it's suitable for use by the "tailscale up" CLI tool where the "tag:" isn't required. The returned error also does not reference the tag itself, so the caller can wrap it as needed with either the full or short form.

func Clone added in v1.2.0

func Clone(dst, src interface{}) bool

Clone duplicates src into dst and reports whether it succeeded. To succeed, <src, dst> must be of types <*T, *T> or <*T, **T>, where T is one of User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse.

Types

type CapType

type CapType string

type Capability

type Capability struct {
	ID   CapabilityID
	Type CapType
	Val  ID
}

func (*Capability) Clone added in v1.2.0

func (src *Capability) Clone() *Capability

Clone makes a deep copy of Capability. The result aliases no memory with the original.

type CapabilityID

type CapabilityID ID

func (CapabilityID) String

func (id CapabilityID) String() string

type DERPMap added in v0.98.1

type DERPMap struct {
	// Regions is the set of geographic regions running DERP node(s).
	//
	// It's keyed by the DERPRegion.RegionID.
	//
	// The numbers are not necessarily contiguous.
	Regions map[int]*DERPRegion
}

DERPMap describes the set of DERP packet relay servers that are available.

func (*DERPMap) RegionIDs added in v0.98.1

func (m *DERPMap) RegionIDs() []int

/ RegionIDs returns the sorted region IDs.

type DERPNode added in v0.98.1

type DERPNode struct {
	// Name is a unique node name (across all regions).
	// It is not a host name.
	// It's typically of the form "1b", "2a", "3b", etc. (region
	// ID + suffix within that region)
	Name string

	// RegionID is the RegionID of the DERPRegion that this node
	// is running in.
	RegionID int

	// HostName is the DERP node's hostname.
	//
	// It is required but need not be unique; multiple nodes may
	// have the same HostName but vary in configuration otherwise.
	HostName string

	// CertName optionally specifies the expected TLS cert common
	// name. If empty, HostName is used. If CertName is non-empty,
	// HostName is only used for the TCP dial (if IPv4/IPv6 are
	// not present) + TLS ClientHello.
	CertName string `json:",omitempty"`

	// IPv4 optionally forces an IPv4 address to use, instead of using DNS.
	// If empty, A record(s) from DNS lookups of HostName are used.
	// If the string is not an IPv4 address, IPv4 is not used; the
	// conventional string to disable IPv4 (and not use DNS) is
	// "none".
	IPv4 string `json:",omitempty"`

	// IPv6 optionally forces an IPv6 address to use, instead of using DNS.
	// If empty, AAAA record(s) from DNS lookups of HostName are used.
	// If the string is not an IPv6 address, IPv6 is not used; the
	// conventional string to disable IPv6 (and not use DNS) is
	// "none".
	IPv6 string `json:",omitempty"`

	// Port optionally specifies a STUN port to use.
	// Zero means 3478.
	// To disable STUN on this node, use -1.
	STUNPort int `json:",omitempty"`

	// STUNOnly marks a node as only a STUN server and not a DERP
	// server.
	STUNOnly bool `json:",omitempty"`

	// DERPTestPort is used in tests to override the port, instead
	// of using the default port of 443. If non-zero, TLS
	// verification is skipped.
	DERPTestPort int `json:",omitempty"`

	// STUNTestIP is used in tests to override the STUN server's IP.
	// If empty, it's assumed to be the same as the DERP server.
	STUNTestIP string `json:",omitempty"`
}

DERPNode describes a DERP packet relay node running within a DERPRegion.

type DERPRegion added in v0.98.1

type DERPRegion struct {
	// RegionID is a unique integer for a geographic region.
	//
	// It corresponds to the legacy derpN.tailscale.com hostnames
	// used by older clients. (Older clients will continue to resolve
	// derpN.tailscale.com when contacting peers, rather than use
	// the server-provided DERPMap)
	//
	// RegionIDs must be non-zero, positive, and guaranteed to fit
	// in a JavaScript number.
	RegionID int

	// RegionCode is a short name for the region. It's usually a popular
	// city or airport code in the region: "nyc", "sf", "sin",
	// "fra", etc.
	RegionCode string

	// RegionName is a long English name for the region: "New York City",
	// "San Francisco", "Singapore", "Frankfurt", etc.
	RegionName string

	// Nodes are the DERP nodes running in this region, in
	// priority order for the current client. Client TLS
	// connections should ideally only go to the first entry
	// (falling back to the second if necessary). STUN packets
	// should go to the first 1 or 2.
	//
	// If nodes within a region route packets amongst themselves,
	// but not to other regions. That said, each user/domain
	// should get a the same preferred node order, so if all nodes
	// for a user/network pick the first one (as they should, when
	// things are healthy), the inter-cluster routing is minimal
	// to zero.
	Nodes []*DERPNode
}

DERPRegion is a geographic region running DERP relay node(s).

Client nodes discover which region they're closest to, advertise that "home" DERP region (previously called "home node", when there was only 1 node per region) and maintain a persistent connection that region as long as it's the closest. Client nodes will further connect to other regions as necessary to communicate with peers advertising other regions as their homes.

type DNSConfig added in v1.0.1

type DNSConfig struct {
	// Nameservers are the IP addresses of the nameservers to use.
	Nameservers []netaddr.IP `json:",omitempty"`
	// Domains are the search domains to use.
	Domains []string `json:",omitempty"`
	// PerDomain indicates whether it is preferred to use Nameservers
	// only for DNS queries for subdomains of Domains.
	// Some OSes and OS configurations don't support per-domain DNS configuration,
	// in which case Nameservers applies to all DNS requests regardless of PerDomain's value.
	PerDomain bool
	// Proxied indicates whether DNS requests are proxied through a tsdns.Resolver.
	// This enables Magic DNS. It is togglable independently of PerDomain.
	Proxied bool
}

DNSConfig is the DNS configuration.

func (*DNSConfig) Clone added in v1.2.0

func (src *DNSConfig) Clone() *DNSConfig

Clone makes a deep copy of DNSConfig. The result aliases no memory with the original.

type Debug added in v0.98.1

type Debug struct {
	// LogHeapPprof controls whether the client should log
	// its heap pprof data. Each true value sent from the server
	// means that client should do one more log.
	LogHeapPprof bool `json:",omitempty"`

	// LogHeapURL is the URL to POST its heap pprof to.
	// Empty means to not log.
	LogHeapURL string `json:",omitempty"`

	// ForceBackgroundSTUN controls whether magicsock should
	// always do its background STUN queries (see magicsock's
	// periodicReSTUN), regardless of inactivity.
	ForceBackgroundSTUN bool `json:",omitempty"`

	// DERPRoute controls whether the DERP reverse path
	// optimization (see Issue 150) should be enabled or
	// disabled. The environment variable in magicsock is the
	// highest priority (if set), then this (if set), then the
	// binary default value.
	DERPRoute opt.Bool `json:",omitempty"`

	// TrimWGConfig controls whether Tailscale does lazy, on-demand
	// wireguard configuration of peers.
	TrimWGConfig opt.Bool `json:",omitempty"`
}

Debug are instructions from the control server to the client to adjust debug settings.

type DiscoKey added in v0.100.0

type DiscoKey [32]byte

DiscoKey is the curve25519 public key for path discovery key. It's never written to disk or reused between network start-ups.

func (DiscoKey) IsZero added in v0.100.0

func (k DiscoKey) IsZero() bool

IsZero reports whether k is the zero value.

func (DiscoKey) MarshalText added in v0.100.0

func (k DiscoKey) MarshalText() ([]byte, error)

func (DiscoKey) ShortString added in v0.100.0

func (k DiscoKey) ShortString() string

func (DiscoKey) String added in v0.100.0

func (k DiscoKey) String() string

func (*DiscoKey) UnmarshalText added in v0.100.0

func (k *DiscoKey) UnmarshalText(text []byte) error

type FilterRule added in v0.98.1

type FilterRule struct {
	SrcIPs   []string // "*" means all
	SrcBits  []int
	DstPorts []NetPortRange
}

FilterRule represents one rule in a packet filter.

type Group

type Group struct {
	ID      GroupID
	Name    string
	Members []ID
}

func (*Group) Clone added in v1.2.0

func (src *Group) Clone() *Group

Clone makes a deep copy of Group. The result aliases no memory with the original.

type GroupID

type GroupID ID

func (GroupID) IsZero added in v1.2.0

func (u GroupID) IsZero() bool

func (GroupID) String

func (id GroupID) String() string

type Hostinfo

type Hostinfo struct {
	// TODO(crawshaw): mark all these fields ",omitempty" when all the
	// iOS apps are updated with the latest swift version of this struct.
	IPNVersion    string       // version of this code
	FrontendLogID string       `json:",omitempty"` // logtail ID of frontend instance
	BackendLogID  string       `json:",omitempty"` // logtail ID of backend instance
	OS            string       // operating system the client runs on (a version.OS value)
	OSVersion     string       `json:",omitempty"` // operating system version, with optional distro prefix ("Debian 10.4", "Windows 10 Pro 10.0.19041")
	DeviceModel   string       `json:",omitempty"` // mobile phone model ("Pixel 3a", "iPhone 11 Pro")
	Hostname      string       // name of the host the client runs on
	GoArch        string       `json:",omitempty"` // the host's GOARCH value (of the running binary)
	RoutableIPs   []wgcfg.CIDR `json:",omitempty"` // set of IP ranges this client can route
	RequestTags   []string     `json:",omitempty"` // set of ACL tags this node wants to claim
	Services      []Service    `json:",omitempty"` // services advertised by this machine
	NetInfo       *NetInfo     `json:",omitempty"`
}

Hostinfo contains a summary of a Tailscale host.

Because it contains pointers (slices), this type should not be used as a value type.

func (*Hostinfo) Clone

func (src *Hostinfo) Clone() *Hostinfo

Clone makes a deep copy of Hostinfo. The result aliases no memory with the original.

func (*Hostinfo) Equal

func (h *Hostinfo) Equal(h2 *Hostinfo) bool

Equal reports whether h and h2 are equal.

type ID

type ID int64

func (ID) String

func (id ID) String() string

type Login

type Login struct {
	ID            LoginID
	Provider      string
	LoginName     string
	DisplayName   string
	ProfilePicURL string
	Domain        string
	// contains filtered or unexported fields
}

func (*Login) Clone added in v1.2.0

func (src *Login) Clone() *Login

Clone makes a deep copy of Login. The result aliases no memory with the original.

type LoginID

type LoginID ID

func (LoginID) IsZero added in v1.2.0

func (u LoginID) IsZero() bool

func (LoginID) String

func (id LoginID) String() string

type MachineKey

type MachineKey [32]byte

MachineKey is the curve25519 public key for a machine.

func (MachineKey) HexString added in v1.2.0

func (k MachineKey) HexString() string

func (MachineKey) IsZero added in v1.2.0

func (k MachineKey) IsZero() bool

IsZero reports whether k is the zero value.

func (MachineKey) MarshalText

func (k MachineKey) MarshalText() ([]byte, error)

func (MachineKey) String

func (k MachineKey) String() string

func (*MachineKey) UnmarshalText

func (k *MachineKey) UnmarshalText(text []byte) error

type MachineStatus

type MachineStatus int

func (MachineStatus) MarshalText

func (m MachineStatus) MarshalText() ([]byte, error)

func (MachineStatus) String

func (m MachineStatus) String() string

func (*MachineStatus) UnmarshalText

func (m *MachineStatus) UnmarshalText(b []byte) error

type MapRequest

type MapRequest struct {
	// Version is incremented whenever the client code changes enough that
	// we want to signal to the control server that we're capable of something
	// different.
	//
	// History of versions:
	//     3: implicit compression, keep-alives
	//     4: opt-in keep-alives via KeepAlive field, opt-in compression via Compress
	//     5: 2020-10-19, implies IncludeIPv6, DeltaPeers/DeltaUserProfiles, supports MagicDNS
	Version     int
	Compress    string // "zstd" or "" (no compression)
	KeepAlive   bool   // whether server should send keep-alives back to us
	NodeKey     NodeKey
	DiscoKey    DiscoKey
	Endpoints   []string // caller's endpoints (IPv4 or IPv6)
	IncludeIPv6 bool     `json:",omitempty"` // include IPv6 endpoints in returned Node Endpoints (for Version 4 clients)
	Stream      bool     // if true, multiple MapResponse objects are returned
	Hostinfo    *Hostinfo

	// ReadOnly is whether the client just wants to fetch the
	// MapResponse, without updating their Endpoints. The
	// Endpoints field will be ignored and LastSeen will not be
	// updated and peers will not be notified of changes.
	//
	// The intended use is for clients to discover the DERP map at
	// start-up before their first real endpoint update.
	ReadOnly bool `json:",omitempty"`

	// OmitPeers is whether the client is okay with the Peers list
	// being omitted in the response. (For example, a client on
	// start up using ReadOnly to get the DERP map.)
	OmitPeers bool `json:",omitempty"`

	// DebugFlags is a list of strings specifying debugging and
	// development features to enable in handling this map
	// request. The values are deliberately unspecified, as they get
	// added and removed all the time during development, and offer no
	// compatibility promise. To roll out semantic changes, bump
	// Version instead.
	DebugFlags []string `json:",omitempty"`
}

MapRequest is sent by a client to start a long-poll network map updates. The request includes a copy of the client's current set of WireGuard endpoints and general host information.

The request is encoded to JSON, encrypted with golang.org/x/crypto/nacl/box, using the local machine key, and sent to:

https://login.tailscale.com/machine/<mkey hex>/map

type MapResponse

type MapResponse struct {
	KeepAlive bool `json:",omitempty"` // if set, all other fields are ignored

	// Networking
	Node    *Node
	DERPMap *DERPMap `json:",omitempty"` // if non-empty, a change in the DERP map.

	// Peers, if non-empty, is the complete list of peers.
	// It will be set in the first MapResponse for a long-polled request/response.
	// Subsequent responses will be delta-encoded if DeltaPeers was set in the request.
	// If Peers is non-empty, PeersChanged and PeersRemoved should
	// be ignored (and should be empty).
	// Peers is always returned sorted by Node.ID.
	Peers []*Node `json:",omitempty"`
	// PeersChanged are the Nodes (identified by their ID) that
	// have changed or been added since the past update on the
	// HTTP response. It's only set if MapRequest.DeltaPeers was true.
	// PeersChanged is always returned sorted by Node.ID.
	PeersChanged []*Node `json:",omitempty"`
	// PeersRemoved are the NodeIDs that are no longer in the peer list.
	PeersRemoved []NodeID `json:",omitempty"`

	// DNS is the same as DNSConfig.Nameservers.
	//
	// TODO(dmytro): should be sent in DNSConfig.Nameservers once clients have updated.
	DNS []wgcfg.IP `json:",omitempty"`
	// SearchPaths are the same as DNSConfig.Domains.
	//
	// TODO(dmytro): should be sent in DNSConfig.Domains once clients have updated.
	SearchPaths []string  `json:",omitempty"`
	DNSConfig   DNSConfig `json:",omitempty"`

	// ACLs
	Domain       string
	PacketFilter []FilterRule
	UserProfiles []UserProfile // as of 1.1.541: may be new or updated user profiles only
	Roles        []Role        // deprecated; clients should not rely on Roles

	// Debug is normally nil, except for when the control server
	// is setting debug settings on a node.
	Debug *Debug `json:",omitempty"`
}

type NetInfo

type NetInfo struct {
	// MappingVariesByDestIP says whether the host's NAT mappings
	// vary based on the destination IP.
	MappingVariesByDestIP opt.Bool

	// HairPinning is their router does hairpinning.
	// It reports true even if there's no NAT involved.
	HairPinning opt.Bool

	// WorkingIPv6 is whether IPv6 works.
	WorkingIPv6 opt.Bool

	// WorkingUDP is whether UDP works.
	WorkingUDP opt.Bool

	// UPnP is whether UPnP appears present on the LAN.
	// Empty means not checked.
	UPnP opt.Bool

	// PMP is whether NAT-PMP appears present on the LAN.
	// Empty means not checked.
	PMP opt.Bool

	// PCP is whether PCP appears present on the LAN.
	// Empty means not checked.
	PCP opt.Bool

	// PreferredDERP is this node's preferred DERP server
	// for incoming traffic. The node might be be temporarily
	// connected to multiple DERP servers (to send to other nodes)
	// but PreferredDERP is the instance number that the node
	// subscribes to traffic at.
	// Zero means disconnected or unknown.
	PreferredDERP int

	// LinkType is the current link type, if known.
	LinkType string `json:",omitempty"` // "wired", "wifi", "mobile" (LTE, 4G, 3G, etc)

	// DERPLatency is the fastest recent time to reach various
	// DERP STUN servers, in seconds. The map key is the
	// "regionID-v4" or "-v6"; it was previously the DERP server's
	// STUN host:port.
	//
	// This should only be updated rarely, or when there's a
	// material change, as any change here also gets uploaded to
	// the control plane.
	DERPLatency map[string]float64 `json:",omitempty"`
}

NetInfo contains information about the host's network state.

func (*NetInfo) BasicallyEqual

func (ni *NetInfo) BasicallyEqual(ni2 *NetInfo) bool

BasicallyEqual reports whether ni and ni2 are basically equal, ignoring changes in DERP ServerLatency & RegionLatency.

func (*NetInfo) Clone

func (src *NetInfo) Clone() *NetInfo

Clone makes a deep copy of NetInfo. The result aliases no memory with the original.

func (*NetInfo) String

func (ni *NetInfo) String() string

type NetPortRange added in v0.98.1

type NetPortRange struct {
	IP    string // "*" means all
	Bits  *int   // backward compatibility: if missing, means "all" bits
	Ports PortRange
	// contains filtered or unexported fields
}

NetPortRange represents a single subnet:portrange.

type Node

type Node struct {
	ID         NodeID
	Name       string // DNS
	User       UserID
	Key        NodeKey
	KeyExpiry  time.Time
	Machine    MachineKey
	DiscoKey   DiscoKey
	Addresses  []wgcfg.CIDR // IP addresses of this Node directly
	AllowedIPs []wgcfg.CIDR // range of IP addresses to route to this node
	Endpoints  []string     `json:",omitempty"` // IP+port (public via STUN, and local LANs)
	DERP       string       `json:",omitempty"` // DERP-in-IP:port ("127.3.3.40:N") endpoint
	Hostinfo   Hostinfo
	Created    time.Time
	LastSeen   *time.Time `json:",omitempty"`

	KeepAlive bool // open and keep open a connection to this peer

	MachineAuthorized bool // TODO(crawshaw): replace with MachineStatus

}

func (*Node) Clone

func (src *Node) Clone() *Node

Clone makes a deep copy of Node. The result aliases no memory with the original.

func (*Node) Equal

func (n *Node) Equal(n2 *Node) bool

Equal reports whether n and n2 are equal.

type NodeID

type NodeID ID

func (NodeID) IsZero added in v1.2.0

func (u NodeID) IsZero() bool

func (NodeID) String

func (id NodeID) String() string

type NodeKey

type NodeKey [32]byte

NodeKey is the curve25519 public key for a node.

func (NodeKey) IsZero

func (k NodeKey) IsZero() bool

IsZero reports whether k is the zero value.

func (NodeKey) MarshalText

func (k NodeKey) MarshalText() ([]byte, error)

func (NodeKey) ShortString added in v0.98.0

func (k NodeKey) ShortString() string

func (NodeKey) String

func (k NodeKey) String() string

func (*NodeKey) UnmarshalText

func (k *NodeKey) UnmarshalText(text []byte) error

type PortRange added in v0.98.1

type PortRange struct {
	First uint16
	Last  uint16
}

PortRange represents a range of UDP or TCP port numbers.

type RegisterRequest

type RegisterRequest struct {
	Version    int // currently 1
	NodeKey    NodeKey
	OldNodeKey NodeKey
	Auth       struct {

		// One of Provider/LoginName, Oauth2Token, or AuthKey is set.
		Provider, LoginName string
		Oauth2Token         *oauth2.Token
		AuthKey             string
		// contains filtered or unexported fields
	}
	Expiry   time.Time // requested key expiry, server policy may override
	Followup string    // response waits until AuthURL is visited
	Hostinfo *Hostinfo
	// contains filtered or unexported fields
}

RegisterRequest is sent by a client to register the key for a node. It is encoded to JSON, encrypted with golang.org/x/crypto/nacl/box, using the local machine key, and sent to:

https://login.tailscale.com/machine/<mkey hex>

func (*RegisterRequest) Clone

func (req *RegisterRequest) Clone() *RegisterRequest

Clone makes a deep copy of RegisterRequest. The result aliases no memory with the original.

TODO: extend cmd/cloner to generate this method.

type RegisterResponse

type RegisterResponse struct {
	User              User
	Login             Login
	NodeKeyExpired    bool   // if true, the NodeKey needs to be replaced
	MachineAuthorized bool   // TODO(crawshaw): move to using MachineStatus
	AuthURL           string // if set, authorization pending
}

RegisterResponse is returned by the server in response to a RegisterRequest.

func (*RegisterResponse) Clone added in v1.2.0

func (src *RegisterResponse) Clone() *RegisterResponse

Clone makes a deep copy of RegisterResponse. The result aliases no memory with the original.

type Role

type Role struct {
	ID           RoleID
	Name         string
	Capabilities []CapabilityID
}

func (*Role) Clone added in v1.2.0

func (src *Role) Clone() *Role

Clone makes a deep copy of Role. The result aliases no memory with the original.

type RoleID

type RoleID ID

func (RoleID) IsZero added in v1.2.0

func (u RoleID) IsZero() bool

func (RoleID) String

func (id RoleID) String() string

type Service

type Service struct {
	Proto       ServiceProto // TCP or UDP
	Port        uint16       // port number service is listening on
	Description string       `json:",omitempty"` // text description of service
	// contains filtered or unexported fields
}

type ServiceProto

type ServiceProto string

type User

type User struct {
	ID            UserID
	LoginName     string `json:"-"` // not stored, filled from Login // TODO REMOVE
	DisplayName   string // if non-empty overrides Login field
	ProfilePicURL string // if non-empty overrides Login field
	Domain        string
	Logins        []LoginID
	Roles         []RoleID
	Created       time.Time
}

User is an IPN user.

A user can have multiple logins associated with it (e.g. gmail and github oauth). (Note: none of our UIs support this yet.)

Some properties are inhereted from the logins and can be overridden, such as display name and profile picture.

Other properties must be the same for all logins associated with a user. In particular: domain. If a user has a "tailscale.io" domain login, they cannot have a general gmail address login associated with the user.

func (*User) Clone

func (src *User) Clone() *User

Clone makes a deep copy of User. The result aliases no memory with the original.

type UserID

type UserID ID

func (UserID) IsZero added in v1.2.0

func (u UserID) IsZero() bool

func (UserID) String

func (id UserID) String() string

type UserProfile

type UserProfile struct {
	ID            UserID
	LoginName     string // "alice@smith.com"; for display purposes only (provider is not listed)
	DisplayName   string // "Alice Smith"
	ProfilePicURL string
	Roles         []RoleID // deprecated; clients should not rely on Roles
}

A UserProfile is display-friendly data for a user. It includes the LoginName for display purposes but *not* the Provider. It also includes derived data from one of the user's logins.

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