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trustedcluster.go
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trustedcluster.go
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package auth
import (
"crypto/tls"
"encoding/json"
"net/http"
"net/url"
"github.com/gravitational/teleport"
"github.com/gravitational/teleport/lib/httplib"
"github.com/gravitational/teleport/lib/services"
"github.com/gravitational/roundtrip"
"github.com/gravitational/trace"
log "github.com/sirupsen/logrus"
)
// UpsertTrustedCluster will either create a new services.TrustedCluster or
// can be used to toggle a services.TrustedCluster on and off.
func (a *AuthServer) UpsertTrustedCluster(t services.TrustedCluster) error {
// check if the trusted cluster exists already
var exists bool
_, err := a.Presence.GetTrustedCluster(t.GetName())
if err == nil {
exists = true
}
// if the trusted cluster does not exist, do the initial token exchange
// to establish trust relationship and return.
if !exists {
err = a.establishTrust(t)
if err != nil {
return trace.Wrap(err)
}
err = a.Presence.UpsertTrustedCluster(t)
if err != nil {
return trace.Wrap(err)
}
return nil
}
// if the trusted cluster exists already, the user is just trying to toggle
// the trusted cluster
if t.GetEnabled() {
err = a.EnableTrustedCluster(t)
if err != nil {
return trace.Wrap(err)
}
} else {
err = a.DisableTrustedCluster(t)
if err != nil {
return trace.Wrap(err)
}
}
return nil
}
// DeleteTrustedCluster removes services.CertAuthority, services.ReverseTunnel,
// and services.TrustedCluster resources.
func (a *AuthServer) DeleteTrustedCluster(name string) error {
err := a.DeleteCertAuthority(services.CertAuthID{Type: services.HostCA, DomainName: name})
if err != nil {
if !trace.IsNotFound(err) {
return trace.Wrap(err)
}
}
err = a.DeleteCertAuthority(services.CertAuthID{Type: services.UserCA, DomainName: name})
if err != nil {
if !trace.IsNotFound(err) {
return trace.Wrap(err)
}
}
err = a.DeleteReverseTunnel(name)
if err != nil {
if !trace.IsNotFound(err) {
return trace.Wrap(err)
}
}
err = a.Presence.DeleteTrustedCluster(name)
if err != nil {
if !trace.IsNotFound(err) {
return trace.Wrap(err)
}
}
return nil
}
// EnableTrustedCluster will enable a TrustedCluster that is already in the backend.
func (a *AuthServer) EnableTrustedCluster(trustedCluster services.TrustedCluster) error {
err := a.ActivateCertAuthority(services.CertAuthID{Type: services.UserCA, DomainName: trustedCluster.GetName()})
if err != nil {
return trace.Wrap(err)
}
err = a.ActivateCertAuthority(services.CertAuthID{Type: services.HostCA, DomainName: trustedCluster.GetName()})
if err != nil {
return trace.Wrap(err)
}
// the remote auth server has verified our token. add the
// reverse tunnel into our backend
reverseTunnel := services.NewReverseTunnel(
trustedCluster.GetName(),
[]string{trustedCluster.GetReverseTunnelAddress()},
)
err = a.UpsertReverseTunnel(reverseTunnel)
if err != nil {
return trace.Wrap(err)
}
err = a.Presence.EnableTrustedCluster(trustedCluster)
if err != nil {
return trace.Wrap(err)
}
return nil
}
// DisableTrustedCluster will disable a TrustedCluster that is already in the backend.
func (a *AuthServer) DisableTrustedCluster(trustedCluster services.TrustedCluster) error {
err := a.DeactivateCertAuthority(services.CertAuthID{Type: services.UserCA, DomainName: trustedCluster.GetName()})
if err != nil {
return trace.Wrap(err)
}
err = a.DeactivateCertAuthority(services.CertAuthID{Type: services.HostCA, DomainName: trustedCluster.GetName()})
if err != nil {
return trace.Wrap(err)
}
err = a.DeleteReverseTunnel(trustedCluster.GetName())
if err != nil {
return trace.Wrap(err)
}
err = a.Presence.DisableTrustedCluster(trustedCluster)
if err != nil {
return trace.Wrap(err)
}
return nil
}
func (a *AuthServer) establishTrust(trustedCluster services.TrustedCluster) error {
var localCertAuthorities []services.CertAuthority
domainName, err := a.GetDomainName()
if err != nil {
return trace.Wrap(err)
}
// get a list of certificate authorities for this auth server
allLocalCAs, err := a.GetCertAuthorities(services.HostCA, false)
if err != nil {
return trace.Wrap(err)
}
for _, lca := range allLocalCAs {
if lca.GetClusterName() == domainName {
localCertAuthorities = append(localCertAuthorities, lca)
}
}
// create a request to validate a trusted cluster (token and local certificate authorities)
validateRequest := ValidateTrustedClusterRequest{
Token: trustedCluster.GetToken(),
CAs: localCertAuthorities,
}
// log the local certificate authorities that we are sending
log.Debugf("[TRUSTED CLUSTER] Sending validate request; token=%v, CAs=%v", validateRequest.Token, validateRequest.CAs)
// send the request to the remote auth server via the proxy
validateResponse, err := a.sendValidateRequestToProxy(trustedCluster.GetProxyAddress(), &validateRequest)
if err != nil {
return trace.Wrap(err)
}
// log the remote certificate authorities we are adding
log.Debugf("[TRUSTED CLUSTER] Received validate response; CAs=%v", validateResponse.CAs)
// the remote auth server has verified our token. add the
// remote certificate authority to our backend
for _, remoteCertAuthority := range validateResponse.CAs {
// add roles into user certificates
// ignore roles set locally by the cert authority
remoteCertAuthority.SetRoles(nil)
if remoteCertAuthority.GetType() == services.UserCA {
for _, r := range trustedCluster.GetRoles() {
remoteCertAuthority.AddRole(r)
}
remoteCertAuthority.SetRoleMap(trustedCluster.GetRoleMap())
}
err = a.UpsertCertAuthority(remoteCertAuthority)
if err != nil {
return trace.Wrap(err)
}
}
// the remote auth server has verified our token. add the
// reverse tunnel into our backend
reverseTunnel := services.NewReverseTunnel(
trustedCluster.GetName(),
[]string{trustedCluster.GetReverseTunnelAddress()},
)
err = a.UpsertReverseTunnel(reverseTunnel)
if err != nil {
return trace.Wrap(err)
}
return nil
}
func (a *AuthServer) validateTrustedCluster(validateRequest *ValidateTrustedClusterRequest) (*ValidateTrustedClusterResponse, error) {
domainName, err := a.GetDomainName()
if err != nil {
return nil, trace.Wrap(err)
}
// validate that we generated the token
err = a.validateTrustedClusterToken(validateRequest.Token)
if err != nil {
return nil, trace.Wrap(err)
}
// log the remote certificate authorities we are adding
log.Debugf("[TRUSTED CLUSTER] Received validate request: token=%v, CAs=%v", validateRequest.Token, validateRequest.CAs)
// token has been validated, upsert the given certificate authority
for _, certAuthority := range validateRequest.CAs {
err = a.UpsertCertAuthority(certAuthority)
if err != nil {
return nil, trace.Wrap(err)
}
}
// export our certificate authority and return it to the cluster
validateResponse := ValidateTrustedClusterResponse{
CAs: []services.CertAuthority{},
}
for _, caType := range []services.CertAuthType{services.HostCA, services.UserCA} {
certAuthorities, err := a.GetCertAuthorities(caType, false)
if err != nil {
return nil, trace.Wrap(err)
}
for _, certAuthority := range certAuthorities {
if certAuthority.GetClusterName() == domainName {
validateResponse.CAs = append(validateResponse.CAs, certAuthority)
}
}
}
// log the local certificate authorities we are sending
log.Debugf("[TRUSTED CLUSTER] Sending validate response: CAs=%v", validateResponse.CAs)
return &validateResponse, nil
}
func (a *AuthServer) validateTrustedClusterToken(token string) error {
roles, err := a.ValidateToken(token)
if err != nil {
return trace.AccessDenied("invalid token")
}
if !roles.Include(teleport.RoleTrustedCluster) {
return trace.AccessDenied("role does not match")
}
if !a.checkTokenTTL(token) {
return trace.AccessDenied("expired token")
}
return nil
}
func (s *AuthServer) sendValidateRequestToProxy(host string, validateRequest *ValidateTrustedClusterRequest) (*ValidateTrustedClusterResponse, error) {
proxyAddr := url.URL{
Scheme: "https",
Host: host,
}
var opts []roundtrip.ClientParam
if s.DeveloperMode {
log.Warn("InsecureSkipVerify used to communicate with proxy.")
log.Warn("Make sure you intend to run Teleport in debug mode.")
// get the default transport (so we can get the proxy from environment)
// but disable tls certificate checking.
tr, ok := http.DefaultTransport.(*http.Transport)
if !ok {
return nil, trace.BadParameter("unable to get default transport")
}
tr.TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
insecureWebClient := &http.Client{
Transport: tr,
}
opts = append(opts, roundtrip.HTTPClient(insecureWebClient))
}
clt, err := roundtrip.NewClient(proxyAddr.String(), teleport.WebAPIVersion, opts...)
if err != nil {
return nil, trace.Wrap(err)
}
validateRequestRaw, err := validateRequest.ToRaw()
if err != nil {
return nil, trace.Wrap(err)
}
out, err := httplib.ConvertResponse(clt.PostJSON(clt.Endpoint("webapi", "trustedclusters", "validate"), validateRequestRaw))
if err != nil {
return nil, trace.Wrap(err)
}
var validateResponseRaw *ValidateTrustedClusterResponseRaw
err = json.Unmarshal(out.Bytes(), &validateResponseRaw)
if err != nil {
return nil, trace.Wrap(err)
}
validateResponse, err := validateResponseRaw.ToNative()
if err != nil {
return nil, trace.Wrap(err)
}
return validateResponse, nil
}
type ValidateTrustedClusterRequest struct {
Token string `json:"token"`
CAs []services.CertAuthority `json:"certificate_authorities"`
}
func (v *ValidateTrustedClusterRequest) ToRaw() (*ValidateTrustedClusterRequestRaw, error) {
cas := [][]byte{}
for _, certAuthority := range v.CAs {
data, err := services.GetCertAuthorityMarshaler().MarshalCertAuthority(certAuthority)
if err != nil {
return nil, trace.Wrap(err)
}
cas = append(cas, data)
}
return &ValidateTrustedClusterRequestRaw{
Token: v.Token,
CAs: cas,
}, nil
}
type ValidateTrustedClusterRequestRaw struct {
Token string `json:"token"`
CAs [][]byte `json:"certificate_authorities"`
}
func (v *ValidateTrustedClusterRequestRaw) ToNative() (*ValidateTrustedClusterRequest, error) {
cas := []services.CertAuthority{}
for _, rawCertAuthority := range v.CAs {
certAuthority, err := services.GetCertAuthorityMarshaler().UnmarshalCertAuthority(rawCertAuthority)
if err != nil {
return nil, trace.Wrap(err)
}
cas = append(cas, certAuthority)
}
return &ValidateTrustedClusterRequest{
Token: v.Token,
CAs: cas,
}, nil
}
type ValidateTrustedClusterResponse struct {
CAs []services.CertAuthority `json:"certificate_authorities"`
}
func (v *ValidateTrustedClusterResponse) ToRaw() (*ValidateTrustedClusterResponseRaw, error) {
cas := [][]byte{}
for _, certAuthority := range v.CAs {
data, err := services.GetCertAuthorityMarshaler().MarshalCertAuthority(certAuthority)
if err != nil {
return nil, trace.Wrap(err)
}
cas = append(cas, data)
}
return &ValidateTrustedClusterResponseRaw{
CAs: cas,
}, nil
}
type ValidateTrustedClusterResponseRaw struct {
CAs [][]byte `json:"certificate_authorities"`
}
func (v *ValidateTrustedClusterResponseRaw) ToNative() (*ValidateTrustedClusterResponse, error) {
cas := []services.CertAuthority{}
for _, rawCertAuthority := range v.CAs {
certAuthority, err := services.GetCertAuthorityMarshaler().UnmarshalCertAuthority(rawCertAuthority)
if err != nil {
return nil, trace.Wrap(err)
}
cas = append(cas, certAuthority)
}
return &ValidateTrustedClusterResponse{
CAs: cas,
}, nil
}