mirror of
https://github.com/juanfont/headscale.git
synced 2024-11-26 17:03:06 +00:00
760 lines
21 KiB
Go
760 lines
21 KiB
Go
package hscontrol
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import (
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"errors"
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"fmt"
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"net/http"
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"strings"
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"time"
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"github.com/juanfont/headscale/hscontrol/mapper"
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"github.com/juanfont/headscale/hscontrol/types"
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"github.com/juanfont/headscale/hscontrol/util"
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"github.com/rs/zerolog/log"
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"gorm.io/gorm"
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"tailscale.com/tailcfg"
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"tailscale.com/types/key"
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)
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// handleRegister is the common logic for registering a client in the legacy and Noise protocols
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//
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// When using Noise, the machineKey is Zero.
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func (h *Headscale) handleRegister(
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writer http.ResponseWriter,
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req *http.Request,
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registerRequest tailcfg.RegisterRequest,
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machineKey key.MachinePublic,
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isNoise bool,
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) {
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now := time.Now().UTC()
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node, err := h.db.GetNodeByAnyKey(machineKey, registerRequest.NodeKey, registerRequest.OldNodeKey)
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if errors.Is(err, gorm.ErrRecordNotFound) {
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// If the node has AuthKey set, handle registration via PreAuthKeys
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if registerRequest.Auth.AuthKey != "" {
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h.handleAuthKey(writer, registerRequest, machineKey, isNoise)
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return
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}
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// Check if the node is waiting for interactive login.
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//
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// TODO(juan): We could use this field to improve our protocol implementation,
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// and hold the request until the client closes it, or the interactive
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// login is completed (i.e., the user registers the node).
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// This is not implemented yet, as it is no strictly required. The only side-effect
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// is that the client will hammer headscale with requests until it gets a
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// successful RegisterResponse.
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if registerRequest.Followup != "" {
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if _, ok := h.registrationCache.Get(util.NodePublicKeyStripPrefix(registerRequest.NodeKey)); ok {
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log.Debug().
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Caller().
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Str("node", registerRequest.Hostinfo.Hostname).
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Str("machine_key", machineKey.ShortString()).
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Str("node_key", registerRequest.NodeKey.ShortString()).
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Str("node_key_old", registerRequest.OldNodeKey.ShortString()).
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Str("follow_up", registerRequest.Followup).
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Bool("noise", isNoise).
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Msg("Node is waiting for interactive login")
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select {
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case <-req.Context().Done():
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return
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case <-time.After(registrationHoldoff):
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h.handleNewNode(writer, registerRequest, machineKey, isNoise)
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return
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}
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}
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}
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log.Info().
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Caller().
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Str("node", registerRequest.Hostinfo.Hostname).
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Str("machine_key", machineKey.ShortString()).
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Str("node_key", registerRequest.NodeKey.ShortString()).
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Str("node_key_old", registerRequest.OldNodeKey.ShortString()).
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Str("follow_up", registerRequest.Followup).
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Bool("noise", isNoise).
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Msg("New node not yet in the database")
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givenName, err := h.db.GenerateGivenName(
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machineKey.String(),
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registerRequest.Hostinfo.Hostname,
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)
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if err != nil {
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log.Error().
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Caller().
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Str("func", "RegistrationHandler").
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Str("hostinfo.name", registerRequest.Hostinfo.Hostname).
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Err(err).
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Msg("Failed to generate given name for node")
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return
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}
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// The node did not have a key to authenticate, which means
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// that we rely on a method that calls back some how (OpenID or CLI)
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// We create the node and then keep it around until a callback
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// happens
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newNode := types.Node{
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MachineKey: util.MachinePublicKeyStripPrefix(machineKey),
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Hostname: registerRequest.Hostinfo.Hostname,
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GivenName: givenName,
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NodeKey: util.NodePublicKeyStripPrefix(registerRequest.NodeKey),
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LastSeen: &now,
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Expiry: &time.Time{},
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}
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if !registerRequest.Expiry.IsZero() {
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log.Trace().
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Caller().
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Bool("noise", isNoise).
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Str("node", registerRequest.Hostinfo.Hostname).
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Time("expiry", registerRequest.Expiry).
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Msg("Non-zero expiry time requested")
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newNode.Expiry = ®isterRequest.Expiry
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}
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h.registrationCache.Set(
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newNode.NodeKey,
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newNode,
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registerCacheExpiration,
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)
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h.handleNewNode(writer, registerRequest, machineKey, isNoise)
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return
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}
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// The node is already in the DB. This could mean one of the following:
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// - The node is authenticated and ready to /map
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// - We are doing a key refresh
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// - The node is logged out (or expired) and pending to be authorized. TODO(juan): We need to keep alive the connection here
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if node != nil {
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// (juan): For a while we had a bug where we were not storing the MachineKey for the nodes using the TS2021,
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// due to a misunderstanding of the protocol https://github.com/juanfont/headscale/issues/1054
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// So if we have a not valid MachineKey (but we were able to fetch the node with the NodeKeys), we update it.
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var storedMachineKey key.MachinePublic
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err = storedMachineKey.UnmarshalText(
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[]byte(util.MachinePublicKeyEnsurePrefix(node.MachineKey)),
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)
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if err != nil || storedMachineKey.IsZero() {
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if err := h.db.NodeSetMachineKey(node, machineKey); err != nil {
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log.Error().
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Caller().
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Str("func", "RegistrationHandler").
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Str("node", node.Hostname).
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Err(err).
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Msg("Error saving machine key to database")
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return
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}
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}
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// If the NodeKey stored in headscale is the same as the key presented in a registration
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// request, then we have a node that is either:
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// - Trying to log out (sending a expiry in the past)
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// - A valid, registered node, looking for /map
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// - Expired node wanting to reauthenticate
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if node.NodeKey == util.NodePublicKeyStripPrefix(registerRequest.NodeKey) {
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// The client sends an Expiry in the past if the client is requesting to expire the key (aka logout)
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// https://github.com/tailscale/tailscale/blob/main/tailcfg/tailcfg.go#L648
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if !registerRequest.Expiry.IsZero() &&
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registerRequest.Expiry.UTC().Before(now) {
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h.handleNodeLogOut(writer, *node, machineKey, isNoise)
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return
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}
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// If node is not expired, and it is register, we have a already accepted this node,
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// let it proceed with a valid registration
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if !node.IsExpired() {
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h.handleNodeWithValidRegistration(writer, *node, machineKey, isNoise)
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return
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}
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}
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// The NodeKey we have matches OldNodeKey, which means this is a refresh after a key expiration
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if node.NodeKey == util.NodePublicKeyStripPrefix(registerRequest.OldNodeKey) &&
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!node.IsExpired() {
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h.handleNodeKeyRefresh(
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writer,
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registerRequest,
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*node,
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machineKey,
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isNoise,
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)
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return
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}
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if registerRequest.Followup != "" {
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select {
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case <-req.Context().Done():
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return
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case <-time.After(registrationHoldoff):
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}
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}
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// The node has expired or it is logged out
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h.handleNodeExpiredOrLoggedOut(writer, registerRequest, *node, machineKey, isNoise)
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// TODO(juan): RegisterRequest includes an Expiry time, that we could optionally use
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node.Expiry = &time.Time{}
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// If we are here it means the client needs to be reauthorized,
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// we need to make sure the NodeKey matches the one in the request
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// TODO(juan): What happens when using fast user switching between two
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// headscale-managed tailnets?
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node.NodeKey = util.NodePublicKeyStripPrefix(registerRequest.NodeKey)
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h.registrationCache.Set(
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util.NodePublicKeyStripPrefix(registerRequest.NodeKey),
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*node,
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registerCacheExpiration,
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)
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return
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}
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}
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// handleAuthKey contains the logic to manage auth key client registration
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// It is used both by the legacy and the new Noise protocol.
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// When using Noise, the machineKey is Zero.
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//
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// TODO: check if any locks are needed around IP allocation.
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func (h *Headscale) handleAuthKey(
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writer http.ResponseWriter,
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registerRequest tailcfg.RegisterRequest,
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machineKey key.MachinePublic,
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isNoise bool,
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) {
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log.Debug().
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Caller().
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Str("node", registerRequest.Hostinfo.Hostname).
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Bool("noise", isNoise).
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Msgf("Processing auth key for %s", registerRequest.Hostinfo.Hostname)
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resp := tailcfg.RegisterResponse{}
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pak, err := h.db.ValidatePreAuthKey(registerRequest.Auth.AuthKey)
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if err != nil {
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log.Error().
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Caller().
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Bool("noise", isNoise).
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Str("node", registerRequest.Hostinfo.Hostname).
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Err(err).
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Msg("Failed authentication via AuthKey")
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resp.MachineAuthorized = false
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respBody, err := mapper.MarshalResponse(resp, isNoise, h.privateKey2019, machineKey)
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if err != nil {
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log.Error().
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Caller().
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Bool("noise", isNoise).
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Str("node", registerRequest.Hostinfo.Hostname).
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Err(err).
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Msg("Cannot encode message")
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http.Error(writer, "Internal server error", http.StatusInternalServerError)
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nodeRegistrations.WithLabelValues("new", util.RegisterMethodAuthKey, "error", pak.User.Name).
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Inc()
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return
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}
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writer.Header().Set("Content-Type", "application/json; charset=utf-8")
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writer.WriteHeader(http.StatusUnauthorized)
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_, err = writer.Write(respBody)
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if err != nil {
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log.Error().
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Caller().
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Bool("noise", isNoise).
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Err(err).
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Msg("Failed to write response")
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}
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log.Error().
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Caller().
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Bool("noise", isNoise).
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Str("node", registerRequest.Hostinfo.Hostname).
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Msg("Failed authentication via AuthKey")
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if pak != nil {
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nodeRegistrations.WithLabelValues("new", util.RegisterMethodAuthKey, "error", pak.User.Name).
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Inc()
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} else {
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nodeRegistrations.WithLabelValues("new", util.RegisterMethodAuthKey, "error", "unknown").Inc()
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}
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return
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}
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log.Debug().
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Caller().
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Bool("noise", isNoise).
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Str("node", registerRequest.Hostinfo.Hostname).
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Msg("Authentication key was valid, proceeding to acquire IP addresses")
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nodeKey := util.NodePublicKeyStripPrefix(registerRequest.NodeKey)
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// retrieve node information if it exist
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// The error is not important, because if it does not
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// exist, then this is a new node and we will move
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// on to registration.
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node, _ := h.db.GetNodeByAnyKey(machineKey, registerRequest.NodeKey, registerRequest.OldNodeKey)
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if node != nil {
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log.Trace().
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Caller().
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Bool("noise", isNoise).
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Str("node", node.Hostname).
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Msg("node was already registered before, refreshing with new auth key")
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node.NodeKey = nodeKey
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node.AuthKeyID = uint(pak.ID)
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err := h.db.NodeSetExpiry(node, registerRequest.Expiry)
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if err != nil {
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log.Error().
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Caller().
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Bool("noise", isNoise).
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Str("node", node.Hostname).
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Err(err).
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Msg("Failed to refresh node")
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return
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}
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aclTags := pak.Proto().AclTags
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if len(aclTags) > 0 {
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// This conditional preserves the existing behaviour, although SaaS would reset the tags on auth-key login
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err = h.db.SetTags(node, aclTags)
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if err != nil {
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log.Error().
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Caller().
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Bool("noise", isNoise).
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Str("node", node.Hostname).
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Strs("aclTags", aclTags).
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Err(err).
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Msg("Failed to set tags after refreshing node")
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return
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}
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}
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} else {
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now := time.Now().UTC()
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givenName, err := h.db.GenerateGivenName(util.MachinePublicKeyStripPrefix(machineKey), registerRequest.Hostinfo.Hostname)
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if err != nil {
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log.Error().
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Caller().
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Bool("noise", isNoise).
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Str("func", "RegistrationHandler").
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Str("hostinfo.name", registerRequest.Hostinfo.Hostname).
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Err(err).
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Msg("Failed to generate given name for node")
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return
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}
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nodeToRegister := types.Node{
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Hostname: registerRequest.Hostinfo.Hostname,
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GivenName: givenName,
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UserID: pak.User.ID,
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MachineKey: util.MachinePublicKeyStripPrefix(machineKey),
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RegisterMethod: util.RegisterMethodAuthKey,
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Expiry: ®isterRequest.Expiry,
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NodeKey: nodeKey,
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LastSeen: &now,
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AuthKeyID: uint(pak.ID),
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ForcedTags: pak.Proto().AclTags,
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}
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node, err = h.db.RegisterNode(
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nodeToRegister,
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)
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if err != nil {
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log.Error().
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Caller().
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Bool("noise", isNoise).
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Err(err).
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Msg("could not register node")
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nodeRegistrations.WithLabelValues("new", util.RegisterMethodAuthKey, "error", pak.User.Name).
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Inc()
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http.Error(writer, "Internal server error", http.StatusInternalServerError)
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return
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}
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}
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err = h.db.UsePreAuthKey(pak)
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if err != nil {
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log.Error().
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Caller().
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Bool("noise", isNoise).
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Err(err).
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Msg("Failed to use pre-auth key")
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nodeRegistrations.WithLabelValues("new", util.RegisterMethodAuthKey, "error", pak.User.Name).
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Inc()
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http.Error(writer, "Internal server error", http.StatusInternalServerError)
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return
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}
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resp.MachineAuthorized = true
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resp.User = *pak.User.TailscaleUser()
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// Provide LoginName when registering with pre-auth key
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// Otherwise it will need to exec `tailscale up` twice to fetch the *LoginName*
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resp.Login = *pak.User.TailscaleLogin()
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respBody, err := mapper.MarshalResponse(resp, isNoise, h.privateKey2019, machineKey)
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if err != nil {
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log.Error().
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Caller().
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Bool("noise", isNoise).
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Str("node", registerRequest.Hostinfo.Hostname).
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Err(err).
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Msg("Cannot encode message")
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nodeRegistrations.WithLabelValues("new", util.RegisterMethodAuthKey, "error", pak.User.Name).
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Inc()
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http.Error(writer, "Internal server error", http.StatusInternalServerError)
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return
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}
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nodeRegistrations.WithLabelValues("new", util.RegisterMethodAuthKey, "success", pak.User.Name).
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Inc()
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writer.Header().Set("Content-Type", "application/json; charset=utf-8")
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writer.WriteHeader(http.StatusOK)
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_, err = writer.Write(respBody)
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if err != nil {
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log.Error().
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Caller().
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Bool("noise", isNoise).
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Err(err).
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Msg("Failed to write response")
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}
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log.Info().
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Bool("noise", isNoise).
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Str("node", registerRequest.Hostinfo.Hostname).
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Str("ips", strings.Join(node.IPAddresses.StringSlice(), ", ")).
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Msg("Successfully authenticated via AuthKey")
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}
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// handleNewNode exposes for both legacy and Noise the functionality to get a URL
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// for authorizing the node. This url is then showed to the user by the local Tailscale client.
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func (h *Headscale) handleNewNode(
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writer http.ResponseWriter,
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registerRequest tailcfg.RegisterRequest,
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machineKey key.MachinePublic,
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isNoise bool,
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) {
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resp := tailcfg.RegisterResponse{}
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// The node registration is new, redirect the client to the registration URL
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log.Debug().
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Caller().
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Bool("noise", isNoise).
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Str("node", registerRequest.Hostinfo.Hostname).
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Msg("The node seems to be new, sending auth url")
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if h.oauth2Config != nil {
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resp.AuthURL = fmt.Sprintf(
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"%s/oidc/register/%s",
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strings.TrimSuffix(h.cfg.ServerURL, "/"),
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registerRequest.NodeKey,
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)
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} else {
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resp.AuthURL = fmt.Sprintf("%s/register/%s",
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strings.TrimSuffix(h.cfg.ServerURL, "/"),
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registerRequest.NodeKey)
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}
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respBody, err := mapper.MarshalResponse(resp, isNoise, h.privateKey2019, machineKey)
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if err != nil {
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log.Error().
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Caller().
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Bool("noise", isNoise).
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Err(err).
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Msg("Cannot encode message")
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http.Error(writer, "Internal server error", http.StatusInternalServerError)
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return
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}
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writer.Header().Set("Content-Type", "application/json; charset=utf-8")
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writer.WriteHeader(http.StatusOK)
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_, err = writer.Write(respBody)
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if err != nil {
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log.Error().
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Bool("noise", isNoise).
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Caller().
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Err(err).
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Msg("Failed to write response")
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}
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log.Info().
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Caller().
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Bool("noise", isNoise).
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Str("AuthURL", resp.AuthURL).
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Str("node", registerRequest.Hostinfo.Hostname).
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Msg("Successfully sent auth url")
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}
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func (h *Headscale) handleNodeLogOut(
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writer http.ResponseWriter,
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node types.Node,
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machineKey key.MachinePublic,
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isNoise bool,
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) {
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resp := tailcfg.RegisterResponse{}
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log.Info().
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Bool("noise", isNoise).
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Str("node", node.Hostname).
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Msg("Client requested logout")
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now := time.Now()
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err := h.db.NodeSetExpiry(&node, now)
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if err != nil {
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log.Error().
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Caller().
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Bool("noise", isNoise).
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Err(err).
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Msg("Failed to expire node")
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http.Error(writer, "Internal server error", http.StatusInternalServerError)
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return
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}
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resp.AuthURL = ""
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resp.MachineAuthorized = false
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resp.NodeKeyExpired = true
|
|
resp.User = *node.User.TailscaleUser()
|
|
respBody, err := mapper.MarshalResponse(resp, isNoise, h.privateKey2019, machineKey)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Bool("noise", isNoise).
|
|
Err(err).
|
|
Msg("Cannot encode message")
|
|
http.Error(writer, "Internal server error", http.StatusInternalServerError)
|
|
|
|
return
|
|
}
|
|
|
|
writer.Header().Set("Content-Type", "application/json; charset=utf-8")
|
|
writer.WriteHeader(http.StatusOK)
|
|
_, err = writer.Write(respBody)
|
|
if err != nil {
|
|
log.Error().
|
|
Bool("noise", isNoise).
|
|
Caller().
|
|
Err(err).
|
|
Msg("Failed to write response")
|
|
|
|
return
|
|
}
|
|
|
|
if node.IsEphemeral() {
|
|
err = h.db.DeleteNode(&node)
|
|
if err != nil {
|
|
log.Error().
|
|
Err(err).
|
|
Str("node", node.Hostname).
|
|
Msg("Cannot delete ephemeral node from the database")
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
log.Info().
|
|
Caller().
|
|
Bool("noise", isNoise).
|
|
Str("node", node.Hostname).
|
|
Msg("Successfully logged out")
|
|
}
|
|
|
|
func (h *Headscale) handleNodeWithValidRegistration(
|
|
writer http.ResponseWriter,
|
|
node types.Node,
|
|
machineKey key.MachinePublic,
|
|
isNoise bool,
|
|
) {
|
|
resp := tailcfg.RegisterResponse{}
|
|
|
|
// The node registration is valid, respond with redirect to /map
|
|
log.Debug().
|
|
Caller().
|
|
Bool("noise", isNoise).
|
|
Str("node", node.Hostname).
|
|
Msg("Client is registered and we have the current NodeKey. All clear to /map")
|
|
|
|
resp.AuthURL = ""
|
|
resp.MachineAuthorized = true
|
|
resp.User = *node.User.TailscaleUser()
|
|
resp.Login = *node.User.TailscaleLogin()
|
|
|
|
respBody, err := mapper.MarshalResponse(resp, isNoise, h.privateKey2019, machineKey)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Bool("noise", isNoise).
|
|
Err(err).
|
|
Msg("Cannot encode message")
|
|
nodeRegistrations.WithLabelValues("update", "web", "error", node.User.Name).
|
|
Inc()
|
|
http.Error(writer, "Internal server error", http.StatusInternalServerError)
|
|
|
|
return
|
|
}
|
|
nodeRegistrations.WithLabelValues("update", "web", "success", node.User.Name).
|
|
Inc()
|
|
|
|
writer.Header().Set("Content-Type", "application/json; charset=utf-8")
|
|
writer.WriteHeader(http.StatusOK)
|
|
_, err = writer.Write(respBody)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Bool("noise", isNoise).
|
|
Err(err).
|
|
Msg("Failed to write response")
|
|
}
|
|
|
|
log.Info().
|
|
Caller().
|
|
Bool("noise", isNoise).
|
|
Str("node", node.Hostname).
|
|
Msg("Node successfully authorized")
|
|
}
|
|
|
|
func (h *Headscale) handleNodeKeyRefresh(
|
|
writer http.ResponseWriter,
|
|
registerRequest tailcfg.RegisterRequest,
|
|
node types.Node,
|
|
machineKey key.MachinePublic,
|
|
isNoise bool,
|
|
) {
|
|
resp := tailcfg.RegisterResponse{}
|
|
|
|
log.Info().
|
|
Caller().
|
|
Bool("noise", isNoise).
|
|
Str("node", node.Hostname).
|
|
Msg("We have the OldNodeKey in the database. This is a key refresh")
|
|
|
|
err := h.db.NodeSetNodeKey(&node, registerRequest.NodeKey)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Err(err).
|
|
Msg("Failed to update machine key in the database")
|
|
http.Error(writer, "Internal server error", http.StatusInternalServerError)
|
|
|
|
return
|
|
}
|
|
|
|
resp.AuthURL = ""
|
|
resp.User = *node.User.TailscaleUser()
|
|
respBody, err := mapper.MarshalResponse(resp, isNoise, h.privateKey2019, machineKey)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Bool("noise", isNoise).
|
|
Err(err).
|
|
Msg("Cannot encode message")
|
|
http.Error(writer, "Internal server error", http.StatusInternalServerError)
|
|
|
|
return
|
|
}
|
|
|
|
writer.Header().Set("Content-Type", "application/json; charset=utf-8")
|
|
writer.WriteHeader(http.StatusOK)
|
|
_, err = writer.Write(respBody)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Bool("noise", isNoise).
|
|
Err(err).
|
|
Msg("Failed to write response")
|
|
}
|
|
|
|
log.Info().
|
|
Caller().
|
|
Bool("noise", isNoise).
|
|
Str("node_key", registerRequest.NodeKey.ShortString()).
|
|
Str("old_node_key", registerRequest.OldNodeKey.ShortString()).
|
|
Str("node", node.Hostname).
|
|
Msg("Node key successfully refreshed")
|
|
}
|
|
|
|
func (h *Headscale) handleNodeExpiredOrLoggedOut(
|
|
writer http.ResponseWriter,
|
|
registerRequest tailcfg.RegisterRequest,
|
|
node types.Node,
|
|
machineKey key.MachinePublic,
|
|
isNoise bool,
|
|
) {
|
|
resp := tailcfg.RegisterResponse{}
|
|
|
|
if registerRequest.Auth.AuthKey != "" {
|
|
h.handleAuthKey(writer, registerRequest, machineKey, isNoise)
|
|
|
|
return
|
|
}
|
|
|
|
// The client has registered before, but has expired or logged out
|
|
log.Trace().
|
|
Caller().
|
|
Bool("noise", isNoise).
|
|
Str("node", node.Hostname).
|
|
Str("machine_key", machineKey.ShortString()).
|
|
Str("node_key", registerRequest.NodeKey.ShortString()).
|
|
Str("node_key_old", registerRequest.OldNodeKey.ShortString()).
|
|
Msg("Node registration has expired or logged out. Sending a auth url to register")
|
|
|
|
if h.oauth2Config != nil {
|
|
resp.AuthURL = fmt.Sprintf("%s/oidc/register/%s",
|
|
strings.TrimSuffix(h.cfg.ServerURL, "/"),
|
|
registerRequest.NodeKey)
|
|
} else {
|
|
resp.AuthURL = fmt.Sprintf("%s/register/%s",
|
|
strings.TrimSuffix(h.cfg.ServerURL, "/"),
|
|
registerRequest.NodeKey)
|
|
}
|
|
|
|
respBody, err := mapper.MarshalResponse(resp, isNoise, h.privateKey2019, machineKey)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Bool("noise", isNoise).
|
|
Err(err).
|
|
Msg("Cannot encode message")
|
|
nodeRegistrations.WithLabelValues("reauth", "web", "error", node.User.Name).
|
|
Inc()
|
|
http.Error(writer, "Internal server error", http.StatusInternalServerError)
|
|
|
|
return
|
|
}
|
|
nodeRegistrations.WithLabelValues("reauth", "web", "success", node.User.Name).
|
|
Inc()
|
|
|
|
writer.Header().Set("Content-Type", "application/json; charset=utf-8")
|
|
writer.WriteHeader(http.StatusOK)
|
|
_, err = writer.Write(respBody)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Bool("noise", isNoise).
|
|
Err(err).
|
|
Msg("Failed to write response")
|
|
}
|
|
|
|
log.Trace().
|
|
Caller().
|
|
Bool("noise", isNoise).
|
|
Str("machine_key", machineKey.ShortString()).
|
|
Str("node_key", registerRequest.NodeKey.ShortString()).
|
|
Str("node_key_old", registerRequest.OldNodeKey.ShortString()).
|
|
Str("node", node.Hostname).
|
|
Msg("Node logged out. Sent AuthURL for reauthentication")
|
|
}
|