mirror of
https://github.com/juanfont/headscale.git
synced 2024-11-26 08:53:05 +00:00
725bbd7408
Prior to the code reorg, we would generate rules from the Policy and store it on the global object. Now we generate it on the fly for each node and this commit cleans up the old variables to make sure we have no unexpected side effects. Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>
729 lines
20 KiB
Go
729 lines
20 KiB
Go
package hscontrol
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import (
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"context"
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"fmt"
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"net/http"
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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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"tailscale.com/tailcfg"
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)
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const (
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keepAliveInterval = 60 * time.Second
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)
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type contextKey string
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const machineNameContextKey = contextKey("machineName")
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// handlePollCommon is the common code for the legacy and Noise protocols to
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// managed the poll loop.
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func (h *Headscale) handlePollCommon(
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writer http.ResponseWriter,
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ctx context.Context,
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machine *types.Machine,
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mapRequest tailcfg.MapRequest,
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isNoise bool,
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) {
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// TODO(kradalby): This is a stepping stone, mapper should be initiated once
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// per client or something similar
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mapp := mapper.NewMapper(h.db,
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h.privateKey2019,
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isNoise,
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h.DERPMap,
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h.cfg.BaseDomain,
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h.cfg.DNSConfig,
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h.cfg.LogTail.Enabled,
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h.cfg.RandomizeClientPort,
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h.cfg.OIDC.StripEmaildomain,
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)
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machine.Hostname = mapRequest.Hostinfo.Hostname
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machine.HostInfo = types.HostInfo(*mapRequest.Hostinfo)
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machine.DiscoKey = util.DiscoPublicKeyStripPrefix(mapRequest.DiscoKey)
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now := time.Now().UTC()
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err := h.db.ProcessMachineRoutes(machine)
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if err != nil {
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log.Error().
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Caller().
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Err(err).
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Str("machine", machine.Hostname).
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Msg("Error processing machine routes")
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}
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// update ACLRules with peer informations (to update server tags if necessary)
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if h.ACLPolicy != nil {
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// update routes with peer information
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err = h.db.EnableAutoApprovedRoutes(h.ACLPolicy, machine)
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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("machine", machine.Hostname).
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Err(err).
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Msg("Error running auto approved routes")
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}
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}
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// From Tailscale client:
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//
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// ReadOnly is whether the client just wants to fetch the MapResponse,
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// without updating their Endpoints. The Endpoints field will be ignored and
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// LastSeen will not be updated and peers will not be notified of changes.
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//
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// The intended use is for clients to discover the DERP map at start-up
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// before their first real endpoint update.
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if !mapRequest.ReadOnly {
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machine.Endpoints = mapRequest.Endpoints
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machine.LastSeen = &now
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}
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if err := h.db.MachineSave(machine); err != nil {
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log.Error().
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Str("handler", "PollNetMap").
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Bool("noise", isNoise).
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Str("node_key", machine.NodeKey).
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Str("machine", machine.Hostname).
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Err(err).
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Msg("Failed to persist/update machine in the database")
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http.Error(writer, "", http.StatusInternalServerError)
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return
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}
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mapResp, err := mapp.CreateMapResponse(mapRequest, machine, h.ACLPolicy)
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if err != nil {
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log.Error().
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Str("handler", "PollNetMap").
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Bool("noise", isNoise).
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Str("node_key", machine.NodeKey).
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Str("machine", machine.Hostname).
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Err(err).
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Msg("Failed to get Map response")
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http.Error(writer, "", http.StatusInternalServerError)
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return
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}
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// We update our peers if the client is not sending ReadOnly in the MapRequest
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// so we don't distribute its initial request (it comes with
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// empty endpoints to peers)
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// Details on the protocol can be found in https://github.com/tailscale/tailscale/blob/main/tailcfg/tailcfg.go#L696
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log.Debug().
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Str("handler", "PollNetMap").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Bool("readOnly", mapRequest.ReadOnly).
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Bool("omitPeers", mapRequest.OmitPeers).
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Bool("stream", mapRequest.Stream).
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Msg("Client map request processed")
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if mapRequest.ReadOnly {
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log.Info().
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Str("handler", "PollNetMap").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Msg("Client is starting up. Probably interested in a DERP map")
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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(mapResp)
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if err != nil {
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log.Error().
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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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if f, ok := writer.(http.Flusher); ok {
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f.Flush()
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}
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return
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}
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// There has been an update to _any_ of the nodes that the other nodes would
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// need to know about
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h.setLastStateChangeToNow()
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// The request is not ReadOnly, so we need to set up channels for updating
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// peers via longpoll
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// Only create update channel if it has not been created
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log.Trace().
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Caller().
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Msg("Loading or creating update channel")
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const chanSize = 8
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updateChan := make(chan struct{}, chanSize)
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pollDataChan := make(chan []byte, chanSize)
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defer closeChanWithLog(pollDataChan, machine.Hostname, "pollDataChan")
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keepAliveChan := make(chan []byte)
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if mapRequest.OmitPeers && !mapRequest.Stream {
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log.Info().
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Str("handler", "PollNetMap").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Msg("Client sent endpoint update and is ok with a response without peer list")
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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(mapResp)
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if err != nil {
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log.Error().
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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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// It sounds like we should update the nodes when we have received a endpoint update
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// even tho the comments in the tailscale code dont explicitly say so.
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updateRequestsFromNode.WithLabelValues(machine.User.Name, machine.Hostname, "endpoint-update").
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Inc()
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updateChan <- struct{}{}
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return
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} else if mapRequest.OmitPeers && mapRequest.Stream {
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log.Warn().
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Str("handler", "PollNetMap").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Msg("Ignoring request, don't know how to handle it")
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http.Error(writer, "", http.StatusBadRequest)
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return
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}
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log.Info().
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Str("handler", "PollNetMap").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Msg("Client is ready to access the tailnet")
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log.Info().
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Str("handler", "PollNetMap").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Msg("Sending initial map")
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pollDataChan <- mapResp
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log.Info().
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Str("handler", "PollNetMap").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Msg("Notifying peers")
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updateRequestsFromNode.WithLabelValues(machine.User.Name, machine.Hostname, "full-update").
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Inc()
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updateChan <- struct{}{}
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h.pollNetMapStream(
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writer,
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ctx,
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machine,
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mapRequest,
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pollDataChan,
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keepAliveChan,
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updateChan,
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isNoise,
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)
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log.Trace().
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Str("handler", "PollNetMap").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Msg("Finished stream, closing PollNetMap session")
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}
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// pollNetMapStream stream logic for /machine/map,
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// ensuring we communicate updates and data to the connected clients.
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func (h *Headscale) pollNetMapStream(
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writer http.ResponseWriter,
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ctxReq context.Context,
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machine *types.Machine,
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mapRequest tailcfg.MapRequest,
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pollDataChan chan []byte,
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keepAliveChan chan []byte,
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updateChan chan struct{},
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isNoise bool,
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) {
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// TODO(kradalby): This is a stepping stone, mapper should be initiated once
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// per client or something similar
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mapp := mapper.NewMapper(h.db,
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h.privateKey2019,
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isNoise,
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h.DERPMap,
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h.cfg.BaseDomain,
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h.cfg.DNSConfig,
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h.cfg.LogTail.Enabled,
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h.cfg.RandomizeClientPort,
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h.cfg.OIDC.StripEmaildomain,
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)
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h.pollNetMapStreamWG.Add(1)
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defer h.pollNetMapStreamWG.Done()
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ctx := context.WithValue(ctxReq, machineNameContextKey, machine.Hostname)
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ctx, cancel := context.WithCancel(ctx)
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defer cancel()
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go h.scheduledPollWorker(
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ctx,
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updateChan,
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keepAliveChan,
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mapRequest,
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machine,
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isNoise,
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)
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log.Trace().
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Str("handler", "pollNetMapStream").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Msg("Waiting for data to stream...")
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log.Trace().
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Str("handler", "pollNetMapStream").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Msgf("pollData is %#v, keepAliveChan is %#v, updateChan is %#v", pollDataChan, keepAliveChan, updateChan)
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for {
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select {
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case data := <-pollDataChan:
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log.Trace().
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Str("handler", "PollNetMapStream").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Str("channel", "pollData").
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Int("bytes", len(data)).
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Msg("Sending data received via pollData channel")
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_, err := writer.Write(data)
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if err != nil {
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log.Error().
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Str("handler", "PollNetMapStream").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Str("channel", "pollData").
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Err(err).
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Msg("Cannot write data")
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return
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}
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flusher, ok := writer.(http.Flusher)
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if !ok {
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log.Error().
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Caller().
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Str("handler", "PollNetMapStream").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Str("channel", "pollData").
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Msg("Cannot cast writer to http.Flusher")
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} else {
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flusher.Flush()
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}
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log.Trace().
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Str("handler", "PollNetMapStream").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Str("channel", "pollData").
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Int("bytes", len(data)).
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Msg("Data from pollData channel written successfully")
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// TODO(kradalby): Abstract away all the database calls, this can cause race conditions
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// when an outdated machine object is kept alive, e.g. db is update from
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// command line, but then overwritten.
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err = h.db.UpdateMachineFromDatabase(machine)
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if err != nil {
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log.Error().
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Str("handler", "PollNetMapStream").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Str("channel", "pollData").
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Err(err).
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Msg("Cannot update machine from database")
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// client has been removed from database
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// since the stream opened, terminate connection.
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return
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}
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now := time.Now().UTC()
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machine.LastSeen = &now
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lastStateUpdate.WithLabelValues(machine.User.Name, machine.Hostname).
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Set(float64(now.Unix()))
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machine.LastSuccessfulUpdate = &now
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err = h.db.TouchMachine(machine)
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if err != nil {
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log.Error().
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Str("handler", "PollNetMapStream").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Str("channel", "pollData").
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Err(err).
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Msg("Cannot update machine LastSuccessfulUpdate")
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return
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}
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log.Trace().
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Str("handler", "PollNetMapStream").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Str("channel", "pollData").
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Int("bytes", len(data)).
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Msg("Machine entry in database updated successfully after sending data")
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case data := <-keepAliveChan:
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log.Trace().
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Str("handler", "PollNetMapStream").
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Str("machine", machine.Hostname).
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Str("channel", "keepAlive").
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Int("bytes", len(data)).
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Msg("Sending keep alive message")
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_, err := writer.Write(data)
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if err != nil {
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log.Error().
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Str("handler", "PollNetMapStream").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Str("channel", "keepAlive").
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Err(err).
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Msg("Cannot write keep alive message")
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return
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}
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flusher, ok := writer.(http.Flusher)
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if !ok {
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log.Error().
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Caller().
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Str("handler", "PollNetMapStream").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Str("channel", "keepAlive").
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Msg("Cannot cast writer to http.Flusher")
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} else {
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flusher.Flush()
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}
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log.Trace().
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Str("handler", "PollNetMapStream").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Str("channel", "keepAlive").
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Int("bytes", len(data)).
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Msg("Keep alive sent successfully")
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// TODO(kradalby): Abstract away all the database calls, this can cause race conditions
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// when an outdated machine object is kept alive, e.g. db is update from
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// command line, but then overwritten.
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err = h.db.UpdateMachineFromDatabase(machine)
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if err != nil {
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log.Error().
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Str("handler", "PollNetMapStream").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Str("channel", "keepAlive").
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Err(err).
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Msg("Cannot update machine from database")
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// client has been removed from database
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// since the stream opened, terminate connection.
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return
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}
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now := time.Now().UTC()
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machine.LastSeen = &now
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err = h.db.TouchMachine(machine)
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if err != nil {
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log.Error().
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Str("handler", "PollNetMapStream").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Str("channel", "keepAlive").
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Err(err).
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Msg("Cannot update machine LastSeen")
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return
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}
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log.Trace().
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Str("handler", "PollNetMapStream").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Str("channel", "keepAlive").
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Int("bytes", len(data)).
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Msg("Machine updated successfully after sending keep alive")
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case <-updateChan:
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log.Trace().
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Str("handler", "PollNetMapStream").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Str("channel", "update").
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Msg("Received a request for update")
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updateRequestsReceivedOnChannel.WithLabelValues(machine.User.Name, machine.Hostname).
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Inc()
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if h.db.IsOutdated(machine, h.getLastStateChange()) {
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var lastUpdate time.Time
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if machine.LastSuccessfulUpdate != nil {
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lastUpdate = *machine.LastSuccessfulUpdate
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}
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log.Debug().
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Str("handler", "PollNetMapStream").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Time("last_successful_update", lastUpdate).
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Time("last_state_change", h.getLastStateChange(machine.User)).
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Msgf("There has been updates since the last successful update to %s", machine.Hostname)
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data, err := mapp.CreateMapResponse(mapRequest, machine, h.ACLPolicy)
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if err != nil {
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log.Error().
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Str("handler", "PollNetMapStream").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Str("channel", "update").
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Err(err).
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Msg("Could not get the map update")
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return
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}
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_, err = writer.Write(data)
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if err != nil {
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log.Error().
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Str("handler", "PollNetMapStream").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Str("channel", "update").
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Err(err).
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Msg("Could not write the map response")
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updateRequestsSentToNode.WithLabelValues(machine.User.Name, machine.Hostname, "failed").
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Inc()
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return
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}
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flusher, ok := writer.(http.Flusher)
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if !ok {
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log.Error().
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Caller().
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Str("handler", "PollNetMapStream").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Str("channel", "update").
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Msg("Cannot cast writer to http.Flusher")
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} else {
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flusher.Flush()
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}
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log.Trace().
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Str("handler", "PollNetMapStream").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Str("channel", "update").
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Msg("Updated Map has been sent")
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updateRequestsSentToNode.WithLabelValues(machine.User.Name, machine.Hostname, "success").
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Inc()
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// Keep track of the last successful update,
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// we sometimes end in a state were the update
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// is not picked up by a client and we use this
|
|
// to determine if we should "force" an update.
|
|
// TODO(kradalby): Abstract away all the database calls, this can cause race conditions
|
|
// when an outdated machine object is kept alive, e.g. db is update from
|
|
// command line, but then overwritten.
|
|
err = h.db.UpdateMachineFromDatabase(machine)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "PollNetMapStream").
|
|
Bool("noise", isNoise).
|
|
Str("machine", machine.Hostname).
|
|
Str("channel", "update").
|
|
Err(err).
|
|
Msg("Cannot update machine from database")
|
|
|
|
// client has been removed from database
|
|
// since the stream opened, terminate connection.
|
|
return
|
|
}
|
|
now := time.Now().UTC()
|
|
|
|
lastStateUpdate.WithLabelValues(machine.User.Name, machine.Hostname).
|
|
Set(float64(now.Unix()))
|
|
machine.LastSuccessfulUpdate = &now
|
|
|
|
err = h.db.TouchMachine(machine)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "PollNetMapStream").
|
|
Bool("noise", isNoise).
|
|
Str("machine", machine.Hostname).
|
|
Str("channel", "update").
|
|
Err(err).
|
|
Msg("Cannot update machine LastSuccessfulUpdate")
|
|
|
|
return
|
|
}
|
|
} else {
|
|
var lastUpdate time.Time
|
|
if machine.LastSuccessfulUpdate != nil {
|
|
lastUpdate = *machine.LastSuccessfulUpdate
|
|
}
|
|
log.Trace().
|
|
Str("handler", "PollNetMapStream").
|
|
Bool("noise", isNoise).
|
|
Str("machine", machine.Hostname).
|
|
Time("last_successful_update", lastUpdate).
|
|
Time("last_state_change", h.getLastStateChange(machine.User)).
|
|
Msgf("%s is up to date", machine.Hostname)
|
|
}
|
|
|
|
case <-ctx.Done():
|
|
log.Info().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Hostname).
|
|
Msg("The client has closed the connection")
|
|
// TODO: Abstract away all the database calls, this can cause race conditions
|
|
// when an outdated machine object is kept alive, e.g. db is update from
|
|
// command line, but then overwritten.
|
|
err := h.db.UpdateMachineFromDatabase(machine)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "PollNetMapStream").
|
|
Bool("noise", isNoise).
|
|
Str("machine", machine.Hostname).
|
|
Str("channel", "Done").
|
|
Err(err).
|
|
Msg("Cannot update machine from database")
|
|
|
|
// client has been removed from database
|
|
// since the stream opened, terminate connection.
|
|
return
|
|
}
|
|
now := time.Now().UTC()
|
|
machine.LastSeen = &now
|
|
err = h.db.TouchMachine(machine)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "PollNetMapStream").
|
|
Bool("noise", isNoise).
|
|
Str("machine", machine.Hostname).
|
|
Str("channel", "Done").
|
|
Err(err).
|
|
Msg("Cannot update machine LastSeen")
|
|
}
|
|
|
|
// The connection has been closed, so we can stop polling.
|
|
return
|
|
|
|
case <-h.shutdownChan:
|
|
log.Info().
|
|
Str("handler", "PollNetMapStream").
|
|
Bool("noise", isNoise).
|
|
Str("machine", machine.Hostname).
|
|
Msg("The long-poll handler is shutting down")
|
|
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func (h *Headscale) scheduledPollWorker(
|
|
ctx context.Context,
|
|
updateChan chan struct{},
|
|
keepAliveChan chan []byte,
|
|
mapRequest tailcfg.MapRequest,
|
|
machine *types.Machine,
|
|
isNoise bool,
|
|
) {
|
|
// TODO(kradalby): This is a stepping stone, mapper should be initiated once
|
|
// per client or something similar
|
|
mapp := mapper.NewMapper(h.db,
|
|
h.privateKey2019,
|
|
isNoise,
|
|
h.DERPMap,
|
|
h.cfg.BaseDomain,
|
|
h.cfg.DNSConfig,
|
|
h.cfg.LogTail.Enabled,
|
|
h.cfg.RandomizeClientPort,
|
|
h.cfg.OIDC.StripEmaildomain,
|
|
)
|
|
|
|
keepAliveTicker := time.NewTicker(keepAliveInterval)
|
|
updateCheckerTicker := time.NewTicker(h.cfg.NodeUpdateCheckInterval)
|
|
|
|
defer closeChanWithLog(
|
|
updateChan,
|
|
fmt.Sprint(ctx.Value(machineNameContextKey)),
|
|
"updateChan",
|
|
)
|
|
defer closeChanWithLog(
|
|
keepAliveChan,
|
|
fmt.Sprint(ctx.Value(machineNameContextKey)),
|
|
"keepAliveChan",
|
|
)
|
|
|
|
for {
|
|
select {
|
|
case <-ctx.Done():
|
|
return
|
|
|
|
case <-keepAliveTicker.C:
|
|
data, err := mapp.CreateKeepAliveResponse(mapRequest, machine)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("func", "keepAlive").
|
|
Bool("noise", isNoise).
|
|
Err(err).
|
|
Msg("Error generating the keep alive msg")
|
|
|
|
return
|
|
}
|
|
|
|
log.Debug().
|
|
Str("func", "keepAlive").
|
|
Str("machine", machine.Hostname).
|
|
Bool("noise", isNoise).
|
|
Msg("Sending keepalive")
|
|
select {
|
|
case keepAliveChan <- data:
|
|
case <-ctx.Done():
|
|
return
|
|
}
|
|
|
|
case <-updateCheckerTicker.C:
|
|
log.Debug().
|
|
Str("func", "scheduledPollWorker").
|
|
Str("machine", machine.Hostname).
|
|
Bool("noise", isNoise).
|
|
Msg("Sending update request")
|
|
updateRequestsFromNode.WithLabelValues(machine.User.Name, machine.Hostname, "scheduled-update").
|
|
Inc()
|
|
select {
|
|
case updateChan <- struct{}{}:
|
|
case <-ctx.Done():
|
|
return
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func closeChanWithLog[C chan []byte | chan struct{}](channel C, machine, name string) {
|
|
log.Trace().
|
|
Str("handler", "PollNetMap").
|
|
Str("machine", machine).
|
|
Str("channel", "Done").
|
|
Msg(fmt.Sprintf("Closing %s channel", name))
|
|
|
|
close(channel)
|
|
}
|