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Support routing to Kubernetes clusters by request path
This implements path-based routing for Kubernetes clusters as described by [RFD0185]. A new prefixed path handler is added that accepts base64-encoded Teleport and Kubernetes cluster names. The request is routed to the destination Teleport cluster using these parameters instead of those embedded in the session TLS identity, and then the preexisting handlers check authorization and complete the request as usual. This removes the need for certificates to be issued per Kubernetes cluster: so long as the incoming identity is granted access to the cluster via its roles, access can succeed, and no `KubernetesCluster` attribute or cert usage restrictions are needed. [RFD0185]: #47436
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| /* | ||
| * Teleport | ||
| * Copyright (C) 2023 Gravitational, Inc. | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU Affero General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU Affero General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Affero General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
| package proxy | ||
|
|
||
| import ( | ||
| "encoding/base64" | ||
| "net/http" | ||
| "strings" | ||
|
|
||
| "github.com/gravitational/teleport/lib/authz" | ||
| "github.com/gravitational/trace" | ||
| "github.com/julienschmidt/httprouter" | ||
| ) | ||
|
|
||
| const ( | ||
| // paramTeleportCluster is the path parameter key containing a base64 | ||
| // encoded Teleport cluster name for path-routed forwarding. | ||
| paramTeleportCluster = "encodedTeleportCluster" | ||
|
|
||
| // paramKubernetesCluster is the path parameter key containing a base64 | ||
| // encoded Teleport cluster name for path-routed forwarding. | ||
| paramKubernetesCluster = "encodedKubernetesCluster" | ||
| ) | ||
|
|
||
| // parseRouteFromPath extracts route information from the given path parameters | ||
| // using constant-defined parameter keys. | ||
| func parseRouteFromPath(p httprouter.Params) (string, string, error) { | ||
| encodedTeleportCluster := p.ByName(paramTeleportCluster) | ||
| if encodedTeleportCluster == "" { | ||
| return "", "", trace.BadParameter("no Teleport cluster name found in path") | ||
| } | ||
|
|
||
| decodedTeleportCluster, err := base64.RawURLEncoding.DecodeString(encodedTeleportCluster) | ||
| if err != nil { | ||
| return "", "", trace.Wrap(err) | ||
| } | ||
|
|
||
| encodedKubernetesCluster := p.ByName(paramKubernetesCluster) | ||
| if encodedKubernetesCluster == "" { | ||
| return "", "", trace.BadParameter("no Kubernetes cluster name found in path") | ||
| } | ||
|
|
||
| decodedKubernetesCluster, err := base64.RawStdEncoding.DecodeString(encodedKubernetesCluster) | ||
| if err != nil { | ||
| return "", "", trace.Wrap(err) | ||
| } | ||
|
|
||
| // TODO: do we care to otherwise validate these results before casting | ||
| // to a string? | ||
| return string(decodedTeleportCluster), string(decodedKubernetesCluster), nil | ||
| } | ||
|
|
||
| func (f *Forwarder) singleCertHandler(_ *authContext, w http.ResponseWriter, req *http.Request, p httprouter.Params) (resp any, err error) { | ||
| teleportCluster, kubeCluster, err := parseRouteFromPath(p) | ||
| if err != nil { | ||
| return nil, trace.Wrap(err) | ||
| } | ||
|
|
||
| userTypeI, err := authz.UserFromContext(req.Context()) | ||
| if err != nil { | ||
| f.log.WithError(err).Warn("error getting user from context") | ||
| return nil, trace.AccessDenied(accessDeniedMsg) | ||
| } | ||
|
|
||
| var userType authz.IdentityGetter | ||
| switch o := userTypeI.(type) { | ||
| case authz.LocalUser: | ||
| o.Identity.RouteToCluster = teleportCluster | ||
| o.Identity.KubernetesCluster = kubeCluster | ||
| userType = o | ||
| case authz.RemoteUser: | ||
| o.Identity.RouteToCluster = teleportCluster | ||
| o.Identity.KubernetesCluster = kubeCluster | ||
| userType = o | ||
| default: | ||
| f.log.Warningf("Denying proxy access to unsupported user type: %T.", userTypeI) | ||
| return nil, trace.AccessDenied(accessDeniedMsg) | ||
| } | ||
|
|
||
| ctx := authz.ContextWithUser(req.Context(), userType) | ||
| req = req.WithContext(ctx) | ||
|
|
||
| path := p.ByName("path") | ||
| if !strings.HasPrefix(path, "/") { | ||
| path = "/" + path | ||
| } | ||
|
|
||
| req.URL.Path = path | ||
| req.RequestURI = req.URL.RequestURI() | ||
|
|
||
| f.router.ServeHTTP(w, req) | ||
| return nil, nil | ||
| } |