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287 lines
8.1 KiB
287 lines
8.1 KiB
package server
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import (
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"crypto"
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"crypto/x509"
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"errors"
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"fmt"
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"io/ioutil"
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"net"
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"net/http"
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"path/filepath"
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"strconv"
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"strings"
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"github.com/gorilla/mux"
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certutil "github.com/rancher/dynamiclistener/cert"
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"github.com/rancher/k3s/pkg/bootstrap"
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"github.com/rancher/k3s/pkg/daemons/config"
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"github.com/rancher/k3s/pkg/passwd"
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"github.com/sirupsen/logrus"
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"k8s.io/apimachinery/pkg/util/json"
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)
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const (
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staticURL = "/static/"
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)
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func router(serverConfig *config.Control, tunnel http.Handler, ca []byte) http.Handler {
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authed := mux.NewRouter()
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authed.Use(authMiddleware(serverConfig, "k3s:agent"))
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authed.NotFoundHandler = serverConfig.Runtime.Handler
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authed.Path("/v1-k3s/serving-kubelet.crt").Handler(servingKubeletCert(serverConfig, serverConfig.Runtime.ServingKubeletKey))
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authed.Path("/v1-k3s/client-kubelet.crt").Handler(clientKubeletCert(serverConfig, serverConfig.Runtime.ClientKubeletKey))
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authed.Path("/v1-k3s/client-kube-proxy.crt").Handler(fileHandler(serverConfig.Runtime.ClientKubeProxyCert, serverConfig.Runtime.ClientKubeProxyKey))
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authed.Path("/v1-k3s/client-k3s-controller.crt").Handler(fileHandler(serverConfig.Runtime.ClientK3sControllerCert, serverConfig.Runtime.ClientK3sControllerKey))
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authed.Path("/v1-k3s/client-ca.crt").Handler(fileHandler(serverConfig.Runtime.ClientCA))
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authed.Path("/v1-k3s/server-ca.crt").Handler(fileHandler(serverConfig.Runtime.ServerCA))
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authed.Path("/v1-k3s/config").Handler(configHandler(serverConfig))
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nodeAuthed := mux.NewRouter()
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nodeAuthed.Use(authMiddleware(serverConfig, "system:nodes"))
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nodeAuthed.Path("/v1-k3s/connect").Handler(tunnel)
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nodeAuthed.NotFoundHandler = authed
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serverAuthed := mux.NewRouter()
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serverAuthed.Use(authMiddleware(serverConfig, "k3s:server"))
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serverAuthed.NotFoundHandler = nodeAuthed
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serverAuthed.Path("/db/info").Handler(nodeAuthed)
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if serverConfig.Runtime.HTTPBootstrap {
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serverAuthed.Path("/v1-k3s/server-bootstrap").Handler(bootstrap.Handler(&serverConfig.Runtime.ControlRuntimeBootstrap))
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}
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staticDir := filepath.Join(serverConfig.DataDir, "static")
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router := mux.NewRouter()
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router.NotFoundHandler = serverAuthed
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router.PathPrefix(staticURL).Handler(serveStatic(staticURL, staticDir))
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router.Path("/cacerts").Handler(cacerts(ca))
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router.Path("/ping").Handler(ping())
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return router
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}
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func cacerts(ca []byte) http.Handler {
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return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
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resp.Header().Set("content-type", "text/plain")
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resp.Write(ca)
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})
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}
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func getNodeInfo(req *http.Request) (string, string, error) {
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nodeNames := req.Header["K3s-Node-Name"]
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if len(nodeNames) != 1 || nodeNames[0] == "" {
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return "", "", errors.New("node name not set")
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}
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nodePasswords := req.Header["K3s-Node-Password"]
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if len(nodePasswords) != 1 || nodePasswords[0] == "" {
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return "", "", errors.New("node password not set")
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}
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return strings.ToLower(nodeNames[0]), nodePasswords[0], nil
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}
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func getCACertAndKeys(caCertFile, caKeyFile, signingKeyFile string) ([]*x509.Certificate, crypto.Signer, crypto.Signer, error) {
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keyBytes, err := ioutil.ReadFile(signingKeyFile)
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if err != nil {
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return nil, nil, nil, err
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}
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key, err := certutil.ParsePrivateKeyPEM(keyBytes)
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if err != nil {
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return nil, nil, nil, err
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}
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caKeyBytes, err := ioutil.ReadFile(caKeyFile)
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if err != nil {
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return nil, nil, nil, err
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}
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caKey, err := certutil.ParsePrivateKeyPEM(caKeyBytes)
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if err != nil {
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return nil, nil, nil, err
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}
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caBytes, err := ioutil.ReadFile(caCertFile)
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if err != nil {
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return nil, nil, nil, err
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}
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caCert, err := certutil.ParseCertsPEM(caBytes)
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if err != nil {
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return nil, nil, nil, err
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}
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return caCert, caKey.(crypto.Signer), key.(crypto.Signer), nil
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}
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func servingKubeletCert(server *config.Control, keyFile string) http.Handler {
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return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
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if req.TLS == nil {
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resp.WriteHeader(http.StatusNotFound)
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return
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}
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nodeName, nodePassword, err := getNodeInfo(req)
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if err != nil {
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sendError(err, resp)
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return
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}
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if err := ensureNodePassword(server.Runtime.NodePasswdFile, nodeName, nodePassword); err != nil {
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sendError(err, resp, http.StatusForbidden)
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return
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}
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caCert, caKey, key, err := getCACertAndKeys(server.Runtime.ServerCA, server.Runtime.ServerCAKey, server.Runtime.ServingKubeletKey)
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if err != nil {
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sendError(err, resp)
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return
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}
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cert, err := certutil.NewSignedCert(certutil.Config{
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CommonName: nodeName,
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Usages: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
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AltNames: certutil.AltNames{
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DNSNames: []string{nodeName, "localhost"},
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IPs: []net.IP{net.ParseIP("127.0.0.1")},
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},
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}, key, caCert[0], caKey)
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if err != nil {
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sendError(err, resp)
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return
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}
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keyBytes, err := ioutil.ReadFile(keyFile)
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if err != nil {
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http.Error(resp, err.Error(), http.StatusInternalServerError)
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return
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}
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resp.Write(append(certutil.EncodeCertPEM(cert), certutil.EncodeCertPEM(caCert[0])...))
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resp.Write(keyBytes)
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})
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}
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func clientKubeletCert(server *config.Control, keyFile string) http.Handler {
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return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
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if req.TLS == nil {
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resp.WriteHeader(http.StatusNotFound)
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return
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}
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nodeName, nodePassword, err := getNodeInfo(req)
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if err != nil {
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sendError(err, resp)
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return
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}
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if err := ensureNodePassword(server.Runtime.NodePasswdFile, nodeName, nodePassword); err != nil {
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sendError(err, resp, http.StatusForbidden)
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return
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}
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caCert, caKey, key, err := getCACertAndKeys(server.Runtime.ClientCA, server.Runtime.ClientCAKey, server.Runtime.ClientKubeletKey)
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if err != nil {
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sendError(err, resp)
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return
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}
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cert, err := certutil.NewSignedCert(certutil.Config{
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CommonName: "system:node:" + nodeName,
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Organization: []string{"system:nodes"},
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Usages: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
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}, key, caCert[0], caKey)
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if err != nil {
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sendError(err, resp)
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return
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}
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keyBytes, err := ioutil.ReadFile(keyFile)
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if err != nil {
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http.Error(resp, err.Error(), http.StatusInternalServerError)
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return
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}
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resp.Write(append(certutil.EncodeCertPEM(cert), certutil.EncodeCertPEM(caCert[0])...))
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resp.Write(keyBytes)
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})
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}
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func fileHandler(fileName ...string) http.Handler {
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return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
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if req.TLS == nil {
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resp.WriteHeader(http.StatusNotFound)
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return
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}
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resp.Header().Set("Content-Type", "text/plain")
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if len(fileName) == 1 {
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http.ServeFile(resp, req, fileName[0])
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return
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}
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for _, f := range fileName {
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bytes, err := ioutil.ReadFile(f)
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if err != nil {
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logrus.Errorf("Failed to read %s: %v", f, err)
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resp.WriteHeader(http.StatusInternalServerError)
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return
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}
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resp.Write(bytes)
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}
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})
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}
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func configHandler(server *config.Control) http.Handler {
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return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
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if req.TLS == nil {
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resp.WriteHeader(http.StatusNotFound)
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return
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}
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resp.Header().Set("content-type", "application/json")
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json.NewEncoder(resp).Encode(server)
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})
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}
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func ping() http.Handler {
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return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
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data := []byte("pong")
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resp.Header().Set("Content-Type", "text/plain")
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resp.Header().Set("Content-Length", strconv.Itoa(len(data)))
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resp.Write(data)
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})
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}
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func serveStatic(urlPrefix, staticDir string) http.Handler {
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return http.StripPrefix(urlPrefix, http.FileServer(http.Dir(staticDir)))
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}
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func sendError(err error, resp http.ResponseWriter, status ...int) {
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code := http.StatusInternalServerError
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if len(status) == 1 {
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code = status[0]
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}
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logrus.Error(err)
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resp.WriteHeader(code)
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resp.Write([]byte(err.Error()))
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}
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func ensureNodePassword(passwdFile, nodeName, pass string) error {
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passwd, err := passwd.Read(passwdFile)
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if err != nil {
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return err
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}
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match, exists := passwd.Check(nodeName, pass)
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if exists {
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if !match {
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return fmt.Errorf("Node password validation failed for '%s', using passwd file '%s'", nodeName, passwdFile)
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}
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return nil
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}
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// If user doesn't exist we save this password for future validation
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passwd.EnsureUser(nodeName, "", pass)
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return passwd.Write(passwdFile)
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}
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