forked from gravitational/teleport
/
handler.go
683 lines (606 loc) · 22.7 KB
/
handler.go
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/*
* 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 app connections to applications over a reverse tunnel and forwards
// HTTP requests to them.
package app
import (
"context"
"crypto/tls"
"fmt"
"io"
"net"
"net/http"
"net/url"
"path"
"github.com/gravitational/trace"
"github.com/jonboulle/clockwork"
"github.com/julienschmidt/httprouter"
"github.com/sirupsen/logrus"
"github.com/gravitational/teleport"
"github.com/gravitational/teleport/api/types"
apievents "github.com/gravitational/teleport/api/types/events"
"github.com/gravitational/teleport/lib/auth"
"github.com/gravitational/teleport/lib/events"
"github.com/gravitational/teleport/lib/httplib/reverseproxy"
"github.com/gravitational/teleport/lib/reversetunnelclient"
"github.com/gravitational/teleport/lib/tlsca"
"github.com/gravitational/teleport/lib/utils"
)
// HandlerConfig is the configuration for an application handler.
type HandlerConfig struct {
// Clock is used to control time in tests.
Clock clockwork.Clock
// AuthClient is a direct client to auth.
AuthClient auth.ClientI
// AccessPoint is caching client to auth.
AccessPoint auth.ProxyAccessPoint
// ProxyClient holds connections to leaf clusters.
ProxyClient reversetunnelclient.Tunnel
// ProxyPublicAddrs contains web proxy public addresses.
ProxyPublicAddrs []utils.NetAddr
// CipherSuites is the list of TLS cipher suites that have been configured
// for this process.
CipherSuites []uint16
// WebPublicAddr
WebPublicAddr string
}
// CheckAndSetDefaults validates configuration.
func (c *HandlerConfig) CheckAndSetDefaults() error {
if c.Clock == nil {
c.Clock = clockwork.NewRealClock()
}
if c.AuthClient == nil {
return trace.BadParameter("auth client missing")
}
if c.AccessPoint == nil {
return trace.BadParameter("access point missing")
}
if len(c.CipherSuites) == 0 {
return trace.BadParameter("ciphersuites missing")
}
return nil
}
// Handler is an application handler.
type Handler struct {
c *HandlerConfig
closeContext context.Context
router *httprouter.Router
cache *sessionCache
clusterName string
log *logrus.Entry
}
// NewHandler returns a new application handler.
func NewHandler(ctx context.Context, c *HandlerConfig) (*Handler, error) {
err := c.CheckAndSetDefaults()
if err != nil {
return nil, trace.Wrap(err)
}
h := &Handler{
c: c,
closeContext: ctx,
log: logrus.WithFields(logrus.Fields{
trace.Component: teleport.ComponentAppProxy,
}),
}
// Create a new session cache, this holds sessions that can be used to
// forward requests.
h.cache, err = newSessionCache(ctx, h.log)
if err != nil {
return nil, trace.Wrap(err)
}
// Get the name of this cluster.
cn, err := h.c.AccessPoint.GetClusterName()
if err != nil {
return nil, trace.Wrap(err)
}
h.clusterName = cn.GetClusterName()
// Create the application routes.
h.router = httprouter.New()
h.router.UseRawPath = true
h.router.GET("/x-teleport-auth", makeRouterHandler(h.startAppAuthExchange))
// DELETE IN 17.0
// Kept for legacy app access.
h.router.OPTIONS("/x-teleport-auth", makeRouterHandler(h.withCustomCORS(nil)))
// DELETE IN 17.0
// when deleting, replace with the commented handler below:
// h.router.POST("/x-teleport-auth", makeRouterHandler(h.completeAppAuthExchange))
h.router.POST("/x-teleport-auth", makeRouterHandler(h.withCustomCORS(h.handleAuth)))
h.router.GET("/teleport-logout", h.withRouterAuth(h.handleLogout))
h.router.NotFound = h.withAuth(h.handleHttp)
return h, nil
}
// ServeHTTP hands the request to the request router.
func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
h.router.ServeHTTP(w, r)
}
// HandleConnection handles connections from plain TCP applications.
func (h *Handler) HandleConnection(ctx context.Context, clientConn net.Conn) error {
tlsConn, ok := clientConn.(utils.TLSConn)
if !ok {
return trace.BadParameter("expected *tls.Conn, got: %T", clientConn)
}
certs := tlsConn.ConnectionState().PeerCertificates
if len(certs) != 1 {
return trace.BadParameter("expected 1 client certificate: %+v", tlsConn.ConnectionState())
}
identity, err := tlsca.FromSubject(certs[0].Subject, certs[0].NotAfter)
if err != nil {
return trace.Wrap(err)
}
ws, err := h.c.AccessPoint.GetAppSession(ctx, types.GetAppSessionRequest{
SessionID: identity.RouteToApp.SessionID,
})
if err != nil {
return trace.Wrap(err)
}
if ws.GetUser() != identity.Username {
err := trace.AccessDenied("session owner %q does not match caller %q", ws.GetUser(), identity.Username)
userMeta := identity.GetUserMetadata()
userMeta.Login = ws.GetUser()
h.c.AuthClient.EmitAuditEvent(h.closeContext, &apievents.AuthAttempt{
Metadata: apievents.Metadata{
Type: events.AuthAttemptEvent,
Code: events.AuthAttemptFailureCode,
},
UserMetadata: userMeta,
ConnectionMetadata: apievents.ConnectionMetadata{
LocalAddr: clientConn.LocalAddr().String(),
RemoteAddr: clientConn.RemoteAddr().String(),
},
Status: apievents.Status{
Success: false,
Error: err.Error(),
},
})
return err
}
session, err := h.getSession(ctx, ws)
if err != nil {
return trace.Wrap(err)
}
serverConn, err := session.tr.DialContext(ctx, "", "")
if err != nil {
return trace.Wrap(err)
}
defer serverConn.Close()
serverConn = tls.Client(serverConn, session.tr.clientTLSConfig)
err = utils.ProxyConn(ctx, clientConn, serverConn)
if err != nil {
return trace.Wrap(err)
}
return nil
}
// HealthCheckAppServer establishes a connection to a AppServer that can handle
// application requests. Can be used to ensure the proxy can handle application
// requests before they arrive.
func (h *Handler) HealthCheckAppServer(ctx context.Context, publicAddr string, clusterName string) error {
clusterClient, err := h.c.ProxyClient.GetSite(clusterName)
if err != nil {
return trace.Wrap(err)
}
accessPoint, err := clusterClient.CachingAccessPoint()
if err != nil {
return trace.Wrap(err)
}
// At least one AppServer needs to be present to serve the requests. Using
// MatchOne can reduce the amount of work required by the app matcher by not
// dialing every AppServer.
_, err = MatchOne(ctx, accessPoint, appServerMatcher(h.c.ProxyClient, publicAddr, clusterName))
if err != nil {
return trace.Wrap(err)
}
return nil
}
// handleHttp forwards the request to the application service or redirects
// to the application directly.
func (h *Handler) handleHttp(w http.ResponseWriter, r *http.Request, session *session) error {
var redirectURI string
session.tr.mu.Lock()
for _, appServer := range session.tr.c.servers {
// If encounter an app server that is to be redirected to, stop iterating.
if redirectInsteadOfForward(appServer) {
redirectURI = appServer.GetApp().GetURI()
break
}
}
session.tr.mu.Unlock()
if redirectURI != "" {
http.Redirect(w, r, redirectURI, http.StatusFound)
return nil
}
if r.Body != nil {
// We replace the request body with a NopCloser so that the request body can
// be closed multiple times. This is needed because Go's HTTP RoundTripper
// will close the request body once called, even if the request
// fails. This is a problem because fwd can retry the request if no app servers
// are available. This retry process happens in `handleForwardError`.
// If the request body is closed, the retry will fail.
// Because the request body is closed after the first request, we need to
// replace the request body with a NopCloser so that the closed body can be
// used again and finally closed when the request handling finishes.
// Teleport only retries requests if DialContext returns a trace.ConnectionProblem.
// Because of this, we can safely assume that the request body is never read
// under those conditions so the retry attempt will start reading from the beginning
// of the request body.
originalBody := r.Body
defer originalBody.Close()
r.Body = io.NopCloser(originalBody)
}
session.fwd.ServeHTTP(w, r)
return nil
}
// handleForwardError when the forwarder has an error during the `ServeHTTP` it
// will call this function. This handler will then renew the session in order
// to get "fresh" app servers, and then will forwad the request to the newly
// created session.
func (h *Handler) handleForwardError(w http.ResponseWriter, req *http.Request, err error) {
// if it is not an agent connection problem, return without creating a new
// session.
if !trace.IsConnectionProblem(err) {
reverseproxy.DefaultHandler.ServeHTTP(w, req, err)
return
}
// If renewing the session fails, we should do the same for when the
// request authentication fails (defined in the "withAuth" middle). This is
// done to have a consistent UX to when launching an application.
session, err := h.renewSession(req)
if err != nil {
if redirectErr := h.redirectToLauncher(w, req, launcherURLParams{}); redirectErr == nil {
return
}
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(http.StatusText(http.StatusInternalServerError)))
return
}
// NOTE: This handler is called by the forwarder when it encounters an error
// during the `ServeHTTP` call. This means that the request forwarding was not successful.
// Since the request was not forwarded, and above we ignore all errors that are not
// connection problems, we can safely assume that the request body was not read.
// This happens because the connection problem is returned by the DialContext
// function, which is the HTTP transport requires before reading the request body.
// Although the request body is not read, the request body is closed by the
// HTTP Transport but we replace the request body in (*Handler).handleForward
// with a NopCloser so that the request body can be closed multiple times without
// impacting the request forwarding.
// If in the future we decide to retry requests that fail for other reasons,
// we need to support body rewinding with `req.GetBody` together with a
// `io.TeeReader` to read the request body and then rewind it.
session.fwd.ServeHTTP(w, req)
}
// authenticate will check if request carries a session cookie matching a
// session in the backend.
func (h *Handler) authenticate(ctx context.Context, r *http.Request) (*session, error) {
ws, err := h.getAppSession(r)
if err != nil {
h.log.Warnf("Failed to fetch application session: %v.", err)
return nil, trace.AccessDenied("invalid session")
}
// Fetch a cached session or create one if this is the first request this
// process has seen.
session, err := h.getSession(ctx, ws)
if err != nil {
h.log.Warnf("Failed to get session: %v.", err)
return nil, trace.AccessDenied("invalid session")
}
return session, nil
}
// renewSession based on the request removes the session from cache (if present)
// and generates a new one using the `getSession` flow (same as in
// `authenticate`).
func (h *Handler) renewSession(r *http.Request) (*session, error) {
ws, err := h.getAppSession(r)
if err != nil {
h.log.Debugf("Failed to fetch application session: not found.")
return nil, trace.AccessDenied("invalid session")
}
// Remove the session from the cache, this will force a new session to be
// generated and cached.
h.cache.remove(ws.GetName())
// Fetches a new session using the same flow as `authenticate`.
session, err := h.getSession(r.Context(), ws)
if err != nil {
h.log.Warnf("Failed to get session: %v.", err)
return nil, trace.AccessDenied("invalid session")
}
return session, nil
}
// getAppSession retrieves the `types.WebSession` using the provided
// `http.Request`.
func (h *Handler) getAppSession(r *http.Request) (ws types.WebSession, err error) {
// We have a client certificate with encoded session id in application
// access CLI flow i.e. when users log in using "tsh apps login" and
// then connect to the apps with the issued certs.
if HasClientCert(r) {
ws, err = h.getAppSessionFromCert(r)
} else {
ws, err = h.getAppSessionFromCookie(r)
}
if err != nil {
h.log.Warnf("Failed to get session: %v.", err)
return nil, trace.AccessDenied("invalid session")
}
return ws, nil
}
func (h *Handler) getAppSessionFromCert(r *http.Request) (types.WebSession, error) {
if !HasClientCert(r) {
return nil, trace.BadParameter("request missing client certificate")
}
certificate := r.TLS.PeerCertificates[0]
identity, err := tlsca.FromSubject(certificate.Subject, certificate.NotAfter)
if err != nil {
return nil, trace.Wrap(err)
}
// Check that the session exists in the backend cache. This allows the user
// to logout and invalidate their application session immediately. This
// lookup should also be fast because it's in the local cache.
ws, err := h.c.AccessPoint.GetAppSession(r.Context(), types.GetAppSessionRequest{
SessionID: identity.RouteToApp.SessionID,
})
if err != nil {
return nil, trace.Wrap(err)
}
if ws.GetUser() != identity.Username {
err := trace.AccessDenied("session owner %q does not match caller %q",
ws.GetUser(), identity.Username)
userMeta := identity.GetUserMetadata()
userMeta.Login = ws.GetUser()
h.c.AuthClient.EmitAuditEvent(h.closeContext, &apievents.AuthAttempt{
Metadata: apievents.Metadata{
Type: events.AuthAttemptEvent,
Code: events.AuthAttemptFailureCode,
},
UserMetadata: userMeta,
ConnectionMetadata: apievents.ConnectionMetadata{
LocalAddr: r.Host,
RemoteAddr: r.RemoteAddr,
},
Status: apievents.Status{
Success: false,
Error: err.Error(),
},
})
return nil, err
}
return ws, nil
}
func (h *Handler) getAppSessionFromCookie(r *http.Request) (types.WebSession, error) {
subjectValue, err := extractCookie(r, SubjectCookieName)
if err != nil {
return nil, trace.Wrap(err)
}
sessionID, err := extractCookie(r, CookieName)
if err != nil {
return nil, trace.Wrap(err)
}
// Check that the session exists in the backend cache. This allows the user
// to logout and invalidate their application session immediately. This
// lookup should also be fast because it's in the local cache.
ws, err := h.c.AccessPoint.GetAppSession(r.Context(), types.GetAppSessionRequest{
SessionID: sessionID,
})
if err != nil {
return nil, trace.Wrap(err)
}
if ws.GetBearerToken() != subjectValue {
err := trace.AccessDenied("subject session token does not match")
h.c.AuthClient.EmitAuditEvent(h.closeContext, &apievents.AuthAttempt{
Metadata: apievents.Metadata{
Type: events.AuthAttemptEvent,
Code: events.AuthAttemptFailureCode,
},
UserMetadata: apievents.UserMetadata{
Login: ws.GetUser(),
User: "unknown", // we don't have client's username, since this came from an http request with cookies.
},
ConnectionMetadata: apievents.ConnectionMetadata{
LocalAddr: r.Host,
RemoteAddr: r.RemoteAddr,
},
Status: apievents.Status{
Success: false,
Error: err.Error(),
},
})
return nil, err
}
return ws, nil
}
// getSession returns a request session used to proxy the request to the
// application service. Always checks if the session is valid first and if so,
// will return a cached session, otherwise will create one.
func (h *Handler) getSession(ctx context.Context, ws types.WebSession) (*session, error) {
// If a cached session exists, return it right away.
session, err := h.cache.get(ws.GetName())
if err == nil {
return session, nil
}
// Create a new session with a forwarder in it.
session, err = h.newSession(ctx, ws)
if err != nil {
return nil, trace.Wrap(err)
}
// Put the session in the cache so the next request can use it.
err = h.cache.set(ws.GetName(), session, ws.Expiry().Sub(h.c.Clock.Now()))
if err != nil {
return nil, trace.Wrap(err)
}
return session, nil
}
// extractCookie extracts the cookie from the *http.Request.
func extractCookie(r *http.Request, cookieName string) (string, error) {
rawCookie, err := r.Cookie(cookieName)
if err != nil {
return "", trace.Wrap(err)
}
if rawCookie != nil && rawCookie.Value == "" {
return "", trace.BadParameter("cookie missing")
}
return rawCookie.Value, nil
}
// HasFragment checks if the request is coming to the fragment authentication
// endpoint.
func HasFragment(r *http.Request) bool {
return r.URL.Path == "/x-teleport-auth"
}
// HasSessionCookie checks if an application specific cookie exists.
func HasSessionCookie(r *http.Request) bool {
_, err := r.Cookie(CookieName)
return err == nil
}
// HasClientCert checks if the request has a client certificate.
func HasClientCert(r *http.Request) bool {
return r.TLS != nil && len(r.TLS.PeerCertificates) > 0
}
// HasName checks if the client is attempting to connect to a
// host that is different than the public address of the proxy. If it is, it
// redirects back to the application launcher in the Web UI.
func HasName(r *http.Request, proxyPublicAddrs []utils.NetAddr) (string, bool) {
raddr, err := utils.ParseAddr(r.Host)
if err != nil {
return "", false
}
for _, paddr := range proxyPublicAddrs {
// The following requests can not be for an application:
//
// * The request is for localhost or loopback.
// * The request is for an IP address.
// * The request is for the public address of the proxy.
if utils.IsLocalhost(raddr.Host()) {
return "", false
}
if net.ParseIP(raddr.Host()) != nil {
return "", false
}
if raddr.Host() == paddr.Host() {
return "", false
}
}
if len(proxyPublicAddrs) == 0 {
return "", false
}
// At this point, it is assumed the caller is requesting an application and
// not the proxy, redirect the caller to the application launcher.
urlString := makeAppRedirectURL(r, proxyPublicAddrs[0].String(), raddr.Host(), launcherURLParams{})
return urlString, true
}
const (
// CookieName is the name of the application session cookie.
CookieName = "__Host-grv_app_session"
// SubjectCookieName is the name of the application session subject cookie.
SubjectCookieName = "__Host-grv_app_session_subject"
// AuthStateCookieName is the name of the state cookie used during the
// initial authentication flow.
AuthStateCookieName = "__Host-grv_app_auth_state"
)
// makeAppRedirectURL constructs a URL that will redirect the user to the
// application launcher route in the web UI.
//
// Depending on how user initially accesses the app, the URL construction
// can take on two formats:
//
// 1: When a user uses the web UI to launch the app, the webapp can
// determine the app's clusterId, publicAddr, and its AWS role name
// (this allows a direct lookup of the app when it's time to create an
// app session) and the launcher route is created with format:
// - /web/launch/<fqdn>/:clusterID?/:publicAddr?/:arn?
// We will need to reconstruct this exact redirect URL when initiating
// an auth exchange (with a stateToken query param).
//
// 2: When a user requests an app outside of web UI (eg. clicking on bookmark)
// aside from knowing the `fqdn`, the other params of the web launcher
// cannot be determined so the launcher route will be constructed as:
// - /web/launch/<fqdn>?path=<encoded path>&query=<encoded query>
// Often bookmarked links will have additional path and queries we will
// need to preserve.
//
// Example Flow:
//
// 1. When a user requests the app endpoint directly, we will need to redirect
// the user to the web launcher first to start the auth exchange.
// Example app endpoint: https://some-domain.com/arbitrary/path?foo=bar&baz=qux
//
// The original requested URL will be separated into three parts:
// - hostname (or fqdn): some-domain.com
// - path (the URL parts after the app's hostname): arbitrary/path
// - query: foo=bar&baz=qux
//
// which will be constructed into a redirect URL using this form:
// - /web/launch/<fqdn>?path=<encoded path>&query=<encoded query>
//
// where the final result for the example URL will be:
// - /web/launch/some-domain.com?path=%2Farbitrary%2Fpath&query=foo%3Dbar%26baz%3Dqux
//
// 2. Building off from previous step, the web app launcher can now redirect the user
// to the apps "x-teleport-auth" endpoint to start the auth exchange:
// https://some-domain.com/x-teleport-auth?path=%2Farbitrary%2Fpath&query=foo%3Dbar%26baz%3Dqux
//
// We will need to reconstruct the same URL ^ along with the stateToken created
// by server:
// - /web/launch/some-domain.com?path=%2Farbitrary%2Fpath&query=foo%3Dbar%26baz%3Dqux&state=ABCD
//
// The URL's are formed this way to help isolate the path params reserved for the app
// launchers route, where order and existence of previous params matter for this route.
func makeAppRedirectURL(r *http.Request, proxyPublicAddr, hostname string, req launcherURLParams) string {
u := url.URL{
Scheme: "https",
Host: proxyPublicAddr,
Path: fmt.Sprintf("/web/launch/%s", hostname),
}
// Presence of a stateToken means we are beginning an app auth exchange.
if req.stateToken != "" {
v := url.Values{}
v.Add("state", req.stateToken)
v.Add("path", req.path)
u.RawQuery = v.Encode()
urlPath := []string{"web", "launch", hostname}
// The order and existence of previous params matter.
//
// If the user requested app through our web UI (click launch button),
// the webapp populate these fields and will be defined.
//
// If the user requested the app endpoint outside of web UI (click from link),
// these fields can't be determined and will be empty.
if req.clusterName != "" && req.publicAddr != "" {
urlPath = append(urlPath, req.clusterName, req.publicAddr)
if req.arn != "" {
urlPath = append(urlPath, req.arn)
}
}
u.Path = path.Join(urlPath...)
} else {
// Hitting this case means the user has hit an endpoint directly
// and will need to be redirected to the web launcher to
// start the auth exchange.
// Note that r.URL.Path field is stored as decoded form where:
// - `/%47%6f%2f` becomes `/Go/`
// - `siema%20elo` becomes `siema elo`
// So Encode() will just encode it once (note that spaces will be convereted to `+`)
v := url.Values{}
v.Add("path", r.URL.Path)
if len(r.URL.RawQuery) > 0 {
v.Add("query", r.URL.RawQuery)
}
u.RawQuery = v.Encode()
}
return u.String()
}
// redirectInsteadOfForward returns true if an application shouldn't be forwarded, but
// should be redirected directly to the public address instead.
func redirectInsteadOfForward(appServer types.AppServer) bool {
return appServer.GetApp().Origin() == types.OriginOkta
}