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connect.go
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connect.go
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package service
import (
"time"
"github.com/gravitational/teleport"
"github.com/gravitational/teleport/lib/auth"
"github.com/gravitational/teleport/lib/services"
"github.com/gravitational/teleport/lib/utils"
"github.com/gravitational/trace"
)
// connectToAuthService attempts to login into the auth servers specified in the
// configuration and receive credentials.
func (process *TeleportProcess) connectToAuthService(role teleport.Role) (*Connector, error) {
connector, err := process.connect(role)
if err != nil {
return nil, trace.Wrap(err)
}
process.Debugf("Connected client: %v", connector.ClientIdentity)
process.Debugf("Connected server: %v", connector.ServerIdentity)
process.addConnector(connector)
return connector, nil
}
func (process *TeleportProcess) connect(role teleport.Role) (conn *Connector, err error) {
state, err := process.storage.GetState(role)
if err != nil {
if !trace.IsNotFound(err) {
return nil, trace.Wrap(err)
}
// no state recorded - this is the first connect
// process will try to connect with the security token.
return process.firstTimeConnect(role)
}
process.Debugf("Connected state: %v.", state.Spec.Rotation.String())
identity, err := process.GetIdentity(role)
if err != nil {
return nil, trace.Wrap(err)
}
rotation := state.Spec.Rotation
switch rotation.State {
// rotation is on standby, so just use whatever is current
case "", services.RotationStateStandby:
// The roles of admin and auth are treaded in a special way, as in this case
// the process does not need TLS clients and can use local auth directly.
if role == teleport.RoleAdmin || role == teleport.RoleAuth {
return &Connector{
ClientIdentity: identity,
ServerIdentity: identity,
AuthServer: process.getLocalAuth(),
}, nil
}
log.Infof("Connecting to the cluster %v with TLS client certificate.", identity.ClusterName)
client, err := process.newClient(process.Config.AuthServers, identity)
if err != nil {
return nil, trace.Wrap(err)
}
return &Connector{Client: client, ClientIdentity: identity, ServerIdentity: identity}, nil
case services.RotationStateInProgress:
switch rotation.Phase {
case services.RotationPhaseInit:
// Both clients and servers are using old credentials,
// this phase exists for remote clusters to propagate information about the new CA
if role == teleport.RoleAdmin || role == teleport.RoleAuth {
return &Connector{
ClientIdentity: identity,
ServerIdentity: identity,
AuthServer: process.getLocalAuth(),
}, nil
}
client, err := process.newClient(process.Config.AuthServers, identity)
if err != nil {
return nil, trace.Wrap(err)
}
return &Connector{
Client: client,
ClientIdentity: identity,
ServerIdentity: identity,
}, nil
case services.RotationPhaseUpdateClients:
// Clients should use updated credentials,
// while servers should use old credentials to answer auth requests.
newIdentity, err := process.storage.ReadIdentity(auth.IdentityReplacement, role)
if err != nil {
return nil, trace.Wrap(err)
}
if role == teleport.RoleAdmin || role == teleport.RoleAuth {
return &Connector{
ClientIdentity: newIdentity,
ServerIdentity: identity,
AuthServer: process.getLocalAuth(),
}, nil
}
client, err := process.newClient(process.Config.AuthServers, newIdentity)
if err != nil {
return nil, trace.Wrap(err)
}
return &Connector{
Client: client,
ClientIdentity: newIdentity,
ServerIdentity: identity,
}, nil
case services.RotationPhaseUpdateServers:
// Servers and clients are using new identity credentials, but the
// identity is still set up to trust the old certificate authority certificates.
newIdentity, err := process.storage.ReadIdentity(auth.IdentityReplacement, role)
if err != nil {
return nil, trace.Wrap(err)
}
if role == teleport.RoleAdmin || role == teleport.RoleAuth {
return &Connector{
ClientIdentity: newIdentity,
ServerIdentity: newIdentity,
AuthServer: process.getLocalAuth(),
}, nil
}
client, err := process.newClient(process.Config.AuthServers, newIdentity)
if err != nil {
return nil, trace.Wrap(err)
}
return &Connector{
Client: client,
ClientIdentity: newIdentity,
ServerIdentity: newIdentity,
}, nil
case services.RotationPhaseRollback:
// In rollback phase, clients and servers should switch back
// to the old certificate authority-issued credentials,
// but the new certificate authority should be trusted
// because not all clients can update at the same time.
if role == teleport.RoleAdmin || role == teleport.RoleAuth {
return &Connector{
ClientIdentity: identity,
ServerIdentity: identity,
AuthServer: process.getLocalAuth(),
}, nil
}
client, err := process.newClient(process.Config.AuthServers, identity)
if err != nil {
return nil, trace.Wrap(err)
}
return &Connector{
Client: client,
ClientIdentity: identity,
ServerIdentity: identity,
}, nil
default:
return nil, trace.BadParameter("unsupported rotation phase: %q", rotation.Phase)
}
default:
return nil, trace.BadParameter("unsupported rotation state: %q", rotation.State)
}
}
func (process *TeleportProcess) firstTimeConnect(role teleport.Role) (*Connector, error) {
id := auth.IdentityID{
Role: role,
HostUUID: process.Config.HostUUID,
NodeName: process.Config.Hostname,
}
additionalPrincipals, err := process.getAdditionalPrincipals(role)
if err != nil {
return nil, trace.Wrap(err)
}
var identity *auth.Identity
if process.getLocalAuth() != nil {
// Auth service is on the same host, no need to go though the invitation
// procedure.
process.Debugf("This server has local Auth server started, using it to add role to the cluster.")
identity, err = auth.LocalRegister(id, process.getLocalAuth(), additionalPrincipals)
} else {
// Auth server is remote, so we need a provisioning token.
if process.Config.Token == "" {
return nil, trace.BadParameter("%v must join a cluster and needs a provisioning token", role)
}
process.Infof("Joining the cluster with a token %v.", process.Config.Token)
identity, err = auth.Register(
process.Config.DataDir,
process.Config.Token,
id,
process.Config.AuthServers,
additionalPrincipals,
process.Config.CipherSuites)
}
if err != nil {
return nil, trace.Wrap(err)
}
log.Infof("%v has successfully registered with the cluster.", role)
var connector *Connector
if role == teleport.RoleAdmin || role == teleport.RoleAuth {
connector = &Connector{
ClientIdentity: identity,
ServerIdentity: identity,
AuthServer: process.getLocalAuth(),
}
} else {
client, err := process.newClient(process.Config.AuthServers, identity)
if err != nil {
return nil, trace.Wrap(err)
}
connector = &Connector{
ClientIdentity: identity,
ServerIdentity: identity,
Client: client,
}
}
// Sync local rotation state to match the remote rotation state.
ca, err := connector.GetCertAuthority(services.CertAuthID{
DomainName: connector.ClientIdentity.ClusterName,
Type: services.HostCA,
}, false)
if err != nil {
return nil, trace.Wrap(err)
}
err = process.storage.WriteIdentity(auth.IdentityCurrent, *identity)
if err != nil {
process.Warningf("Failed to write %v identity: %v.", role, err)
}
err = process.storage.WriteState(role, auth.StateV2{
Spec: auth.StateSpecV2{
Rotation: ca.GetRotation(),
},
})
if err != nil {
return nil, trace.Wrap(err)
}
process.Infof("The process has successfully wrote credentials and state of %v to disk.", role)
return connector, nil
}
// periodicSyncRotationState checks rotation state periodically and
// takes action if necessary
func (process *TeleportProcess) periodicSyncRotationState() error {
// start rotation only after teleport process has started
eventC := make(chan Event, 1)
process.WaitForEvent(process.ExitContext(), TeleportReadyEvent, eventC)
select {
case <-eventC:
process.Infof("The new service has started successfully. Starting syncing rotation status with period %v.", process.Config.PollingPeriod)
case <-process.ExitContext().Done():
process.Infof("Periodic rotation sync has exited.")
return nil
}
t := time.NewTicker(process.Config.PollingPeriod)
defer t.Stop()
for {
select {
case <-t.C:
status, err := process.syncRotationState()
if err != nil {
if trace.IsConnectionProblem(err) {
process.Warningf("Connection problem: sync rotation state: %v.", err)
} else {
process.Warningf("Failed to sync rotation state: %v.", err)
}
} else {
if status.phaseChanged || status.needsReload {
process.Debugf("Sync rotation state detected cert authority reload phase update.")
}
if status.phaseChanged {
process.BroadcastEvent(Event{Name: TeleportPhaseChangeEvent})
}
if status.needsReload {
process.Debugf("Triggering reload process.")
process.BroadcastEvent(Event{Name: TeleportReloadEvent})
return nil
}
}
case <-process.ExitContext().Done():
process.Infof("Periodic rotation sync has exited because the process is shutting down.")
return nil
}
}
}
// syncRotationState compares cluster rotation state with the state of
// internal services and performs the rotation if necessary.
func (process *TeleportProcess) syncRotationState() (*rotationStatus, error) {
connectors := process.getConnectors()
if len(connectors) == 0 {
return nil, trace.BadParameter("no connectors found")
}
// it is important to use the same view of the certificate authority
// for all internal services at the same time, so that the same
// procedure will be applied at the same time for multiple service process
// and no internal services is left behind.
conn := connectors[0]
ca, err := conn.GetCertAuthority(services.CertAuthID{
DomainName: conn.ClientIdentity.ClusterName,
Type: services.HostCA,
}, false)
if err != nil {
return nil, trace.Wrap(err)
}
var status rotationStatus
for _, conn := range connectors {
serviceStatus, err := process.syncServiceRotationState(ca, conn)
if err != nil {
return nil, trace.Wrap(err)
}
if serviceStatus.needsReload {
status.needsReload = true
}
if serviceStatus.phaseChanged {
status.phaseChanged = true
}
}
return &status, nil
}
// syncServiceRotationState syncs up rotation state for internal services (Auth, Proxy, Node) and
// if necessary, updates credentials. Returns true if the service will need to reload.
func (process *TeleportProcess) syncServiceRotationState(ca services.CertAuthority, conn *Connector) (*rotationStatus, error) {
state, err := process.storage.GetState(conn.ClientIdentity.ID.Role)
if err != nil {
return nil, trace.Wrap(err)
}
return process.rotate(conn, *state, ca.GetRotation())
}
type rotationStatus struct {
// needsReload means that phase has been updated
// and teleport process has to reload
needsReload bool
// phaseChanged means that teleport phase has been updated,
// but teleport does not need reload
phaseChanged bool
}
// rotate is called to check if rotation should be triggered.
func (process *TeleportProcess) rotate(conn *Connector, localState auth.StateV2, remote services.Rotation) (*rotationStatus, error) {
id := conn.ClientIdentity.ID
local := localState.Spec.Rotation
additionalPrincipals, err := process.getAdditionalPrincipals(id.Role)
if err != nil {
return nil, trace.Wrap(err)
}
principalsChanged := len(additionalPrincipals) != 0 && !conn.ServerIdentity.HasPrincipals(additionalPrincipals)
if local.Matches(remote) && !principalsChanged {
// nothing to do, local state and rotation state are in sync
return &rotationStatus{}, nil
}
storage := process.storage
const outOfSync = "%v and cluster rotation state (%v) is out of sync with local (%v). Clear local state and re-register this %v."
writeStateAndIdentity := func(name string, identity *auth.Identity) error {
err = storage.WriteIdentity(name, *identity)
if err != nil {
return trace.Wrap(err)
}
localState.Spec.Rotation = remote
err = storage.WriteState(id.Role, localState)
if err != nil {
return trace.Wrap(err)
}
return nil
}
switch remote.State {
case "", services.RotationStateStandby:
switch local.State {
// There is nothing to do, it could happen
// that the old node came up and missed the whole rotation
// rollback cycle.
case "", services.RotationStateStandby:
if principalsChanged {
process.Infof("Service %v has updated principals to %q, going to request new principals and update.", id.Role, additionalPrincipals)
identity, err := conn.ReRegister(additionalPrincipals)
if err != nil {
return nil, trace.Wrap(err)
}
err = storage.WriteIdentity(auth.IdentityCurrent, *identity)
if err != nil {
return nil, trace.Wrap(err)
}
return &rotationStatus{needsReload: true}, nil
}
return &rotationStatus{}, nil
case services.RotationStateInProgress:
// Rollback phase has been completed, all services
// will receive new identities.
if local.Phase != services.RotationPhaseRollback && local.CurrentID != remote.CurrentID {
return nil, trace.CompareFailed(outOfSync, id.Role, remote, local, id.Role)
}
identity, err := conn.ReRegister(additionalPrincipals)
if err != nil {
return nil, trace.Wrap(err)
}
err = writeStateAndIdentity(auth.IdentityCurrent, identity)
if err != nil {
return nil, trace.Wrap(err)
}
return &rotationStatus{needsReload: true}, nil
default:
return nil, trace.BadParameter("unsupported state: %q", localState)
}
case services.RotationStateInProgress:
switch remote.Phase {
case services.RotationPhaseStandby, "":
// There is nothing to do.
return &rotationStatus{}, nil
case services.RotationPhaseInit:
// Only allow transition in case if local rotation state is standby
// so this server is in the "clean" state.
if local.State != services.RotationStateStandby && local.State != "" {
return nil, trace.CompareFailed(outOfSync, id.Role, remote, local, id.Role)
}
// only update local phase, there is no need to reload
localState.Spec.Rotation = remote
err = storage.WriteState(id.Role, localState)
if err != nil {
return nil, trace.Wrap(err)
}
return &rotationStatus{phaseChanged: true}, nil
case services.RotationPhaseUpdateClients:
// Allow transition to this phase only if the previous
// phase was "Init".
if local.Phase != services.RotationPhaseInit && local.CurrentID != remote.CurrentID {
return nil, trace.CompareFailed(outOfSync, id.Role, remote, local, id.Role)
}
identity, err := conn.ReRegister(additionalPrincipals)
if err != nil {
return nil, trace.Wrap(err)
}
err = writeStateAndIdentity(auth.IdentityReplacement, identity)
if err != nil {
return nil, trace.Wrap(err)
}
// Require reload of teleport process to update client and servers.
return &rotationStatus{needsReload: true}, nil
case services.RotationPhaseUpdateServers:
// Allow transition to this phase only if the previous
// phase was "Update clients".
if local.Phase != services.RotationPhaseUpdateClients && local.CurrentID != remote.CurrentID {
return nil, trace.CompareFailed(outOfSync, id.Role, remote, local, id.Role)
}
// Write the replacement identity as a current identity and reload the server.
replacement, err := storage.ReadIdentity(auth.IdentityReplacement, id.Role)
if err != nil {
return nil, trace.Wrap(err)
}
err = writeStateAndIdentity(auth.IdentityCurrent, replacement)
if err != nil {
return nil, trace.Wrap(err)
}
// Require reload of teleport process to update servers.
return &rotationStatus{needsReload: true}, nil
case services.RotationPhaseRollback:
// Allow transition to this phase from any other local phase
// because it will be widely used to recover cluster state to
// the previously valid state, client will re-register to receive
// credentials signed by the "old" CA.
identity, err := conn.ReRegister(additionalPrincipals)
if err != nil {
return nil, trace.Wrap(err)
}
err = writeStateAndIdentity(auth.IdentityCurrent, identity)
if err != nil {
return nil, trace.Wrap(err)
}
// Require reload of teleport process to update servers.
return &rotationStatus{needsReload: true}, nil
default:
return nil, trace.BadParameter("unsupported phase: %q", remote.Phase)
}
default:
return nil, trace.BadParameter("unsupported state: %q", remote.State)
}
}
func (process *TeleportProcess) newClient(authServers []utils.NetAddr, identity *auth.Identity) (*auth.Client, error) {
tlsConfig, err := identity.TLSConfig(process.Config.CipherSuites)
if err != nil {
return nil, trace.Wrap(err)
}
if process.Config.ClientTimeout != 0 {
return auth.NewTLSClient(authServers, tlsConfig, auth.ClientTimeout(process.Config.ClientTimeout))
}
return auth.NewTLSClient(authServers, tlsConfig)
}