k3s/pkg/server/auth.go

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package server
import (
"net/http"
"github.com/gorilla/mux"
"github.com/k3s-io/k3s/pkg/daemons/config"
"github.com/k3s-io/k3s/pkg/generated/clientset/versioned/scheme"
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"github.com/sirupsen/logrus"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apiserver/pkg/endpoints/handlers/responsewriters"
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"k8s.io/apiserver/pkg/endpoints/request"
)
func hasRole(mustRoles []string, roles []string) bool {
for _, check := range roles {
for _, role := range mustRoles {
if role == check {
return true
}
}
}
return false
}
func doAuth(roles []string, serverConfig *config.Control, next http.Handler, rw http.ResponseWriter, req *http.Request) {
switch {
case serverConfig == nil:
logrus.Errorf("Authenticate not initialized: serverConfig is nil")
unauthorized(rw, req)
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return
case serverConfig.Runtime.Authenticator == nil:
logrus.Errorf("Authenticate not initialized: serverConfig.Runtime.Authenticator is nil")
unauthorized(rw, req)
return
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}
resp, ok, err := serverConfig.Runtime.Authenticator.AuthenticateRequest(req)
if err != nil {
logrus.Errorf("Failed to authenticate request from %s: %v", req.RemoteAddr, err)
unauthorized(rw, req)
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return
}
if !ok || !hasRole(roles, resp.User.GetGroups()) {
forbidden(rw, req)
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return
}
ctx := request.WithUser(req.Context(), resp.User)
req = req.WithContext(ctx)
next.ServeHTTP(rw, req)
}
func authMiddleware(serverConfig *config.Control, roles ...string) mux.MiddlewareFunc {
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return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
doAuth(roles, serverConfig, next, rw, req)
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})
}
}
func unauthorized(resp http.ResponseWriter, req *http.Request) {
responsewriters.ErrorNegotiated(
&apierrors.StatusError{ErrStatus: metav1.Status{
Status: metav1.StatusFailure,
Code: http.StatusUnauthorized,
Reason: metav1.StatusReasonUnauthorized,
Message: "not authorized",
}},
scheme.Codecs.WithoutConversion(), schema.GroupVersion{}, resp, req,
)
}
func forbidden(resp http.ResponseWriter, req *http.Request) {
responsewriters.ErrorNegotiated(
&apierrors.StatusError{ErrStatus: metav1.Status{
Status: metav1.StatusFailure,
Code: http.StatusForbidden,
Reason: metav1.StatusReasonForbidden,
Message: "forbidden",
}},
scheme.Codecs.WithoutConversion(), schema.GroupVersion{}, resp, req,
)
}