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|
package main
import (
"crypto/tls"
"errors"
"fmt"
"net"
"net/http"
"os"
"sync"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/rs/cors"
log "github.com/sirupsen/logrus"
"gitlab.com/gitlab-org/labkit/errortracking"
"gitlab.com/gitlab-org/labkit/metrics"
mimedb "gitlab.com/lupine/go-mimedb"
"gitlab.com/gitlab-org/gitlab-pages/internal/acme"
"gitlab.com/gitlab-org/gitlab-pages/internal/admin"
"gitlab.com/gitlab-org/gitlab-pages/internal/artifact"
"gitlab.com/gitlab-org/gitlab-pages/internal/auth"
headerConfig "gitlab.com/gitlab-org/gitlab-pages/internal/config"
"gitlab.com/gitlab-org/gitlab-pages/internal/domain"
"gitlab.com/gitlab-org/gitlab-pages/internal/httperrors"
"gitlab.com/gitlab-org/gitlab-pages/internal/logging"
"gitlab.com/gitlab-org/gitlab-pages/internal/netutil"
"gitlab.com/gitlab-org/gitlab-pages/internal/request"
"gitlab.com/gitlab-org/gitlab-pages/internal/source"
)
const (
xForwardedProto = "X-Forwarded-Proto"
xForwardedHost = "X-Forwarded-Host"
xForwardedProtoHTTPS = "https"
)
var (
corsHandler = cors.New(cors.Options{AllowedMethods: []string{"GET"}})
)
var (
errStartListener = errors.New("Could not start listener")
errX509KeyPair = errors.New("Could not initialize KeyPair")
)
type theApp struct {
appConfig
domains *source.Domains
Artifact *artifact.Artifact
Auth *auth.Auth
AcmeMiddleware *acme.Middleware
CustomHeaders http.Header
}
func (a *theApp) isReady() bool {
return a.domains.Ready()
}
func (a *theApp) ServeTLS(ch *tls.ClientHelloInfo) (*tls.Certificate, error) {
if ch.ServerName == "" {
return nil, nil
}
if domain := a.domains.GetDomain(ch.ServerName); domain != nil {
tls, _ := domain.EnsureCertificate()
return tls, nil
}
return nil, nil
}
func (a *theApp) healthCheck(w http.ResponseWriter, r *http.Request, https bool) {
if a.isReady() {
w.Write([]byte("success"))
} else {
http.Error(w, "not yet ready", http.StatusServiceUnavailable)
}
}
func (a *theApp) redirectToHTTPS(w http.ResponseWriter, r *http.Request, statusCode int) {
u := *r.URL
u.Scheme = "https"
u.Host = r.Host
u.User = nil
http.Redirect(w, r, u.String(), statusCode)
}
func (a *theApp) getHostAndDomain(r *http.Request) (host string, domain *domain.Domain) {
host, _, err := net.SplitHostPort(r.Host)
if err != nil {
host = r.Host
}
return host, a.domain(host)
}
func (a *theApp) domain(host string) *domain.Domain {
return a.domains.GetDomain(host)
}
func (a *theApp) checkAuthenticationIfNotExists(domain *domain.Domain, w http.ResponseWriter, r *http.Request) bool {
if domain == nil || !domain.HasProject(r) {
// Only if auth is supported
if a.Auth.IsAuthSupported() {
// To avoid user knowing if pages exist, we will force user to login and authorize pages
if a.Auth.CheckAuthenticationWithoutProject(w, r) {
return true
}
// User is authenticated, show the 404
httperrors.Serve404(w)
return true
}
}
// Without auth, fall back to 404
if domain == nil {
httperrors.Serve404(w)
return true
}
return false
}
func (a *theApp) tryAuxiliaryHandlers(w http.ResponseWriter, r *http.Request, https bool, host string, domain *domain.Domain) bool {
// short circuit content serving to check for a status page
if r.RequestURI == a.appConfig.StatusPath {
a.healthCheck(w, r, https)
return true
}
// Add auto redirect
if !https && a.RedirectHTTP {
a.redirectToHTTPS(w, r, http.StatusTemporaryRedirect)
return true
}
// In the event a host is prefixed with the artifact prefix an artifact
// value is created, and an attempt to proxy the request is made
if a.Artifact.TryMakeRequest(host, w, r) {
return true
}
if !a.isReady() {
httperrors.Serve503(w)
return true
}
if a.checkAuthenticationIfNotExists(domain, w, r) {
return true
}
if !https && domain.IsHTTPSOnly(r) {
a.redirectToHTTPS(w, r, http.StatusMovedPermanently)
return true
}
return false
}
// routingMiddleware will determine the host and domain for the request, for
// downstream middlewares to use
func (a *theApp) routingMiddleware(handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
host, domain := a.getHostAndDomain(r)
r = request.WithHostAndDomain(r, host, domain)
handler.ServeHTTP(w, r)
})
}
// customHeadersMiddleware will inject custom headers into the response
func (a *theApp) customHeadersMiddleware(handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
headerConfig.AddCustomHeaders(w, a.CustomHeaders)
handler.ServeHTTP(w, r)
})
}
// acmeMiddleware will handle ACME challenges
func (a *theApp) acmeMiddleware(handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
domain := request.GetDomain(r)
if a.AcmeMiddleware.ServeAcmeChallenges(w, r, domain) {
return
}
handler.ServeHTTP(w, r)
})
}
// authMiddleware handles authentication requests
func (a *theApp) authMiddleware(handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if a.Auth.TryAuthenticate(w, r, a.domains) {
return
}
handler.ServeHTTP(w, r)
})
}
// auxiliaryMiddleware will handle status updates, not-ready requests and other
// not static-content responses
func (a *theApp) auxiliaryMiddleware(handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
host := request.GetHost(r)
domain := request.GetDomain(r)
https := request.IsHTTPS(r)
if a.tryAuxiliaryHandlers(w, r, https, host, domain) {
return
}
handler.ServeHTTP(w, r)
})
}
// accessControlMiddleware will handle authorization
func (a *theApp) accessControlMiddleware(handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
domain := request.GetDomain(r)
// Only for projects that have access control enabled
if domain.IsAccessControlEnabled(r) {
// accessControlMiddleware
if a.Auth.CheckAuthentication(w, r, domain.GetID(r)) {
return
}
}
handler.ServeHTTP(w, r)
})
}
// serveFileOrNotFoundHandler will serve static content or
// return a 404 Not Found response
func (a *theApp) serveFileOrNotFoundHandler() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
domain := request.GetDomain(r)
fileServed := domain.ServeFileHTTP(w, r)
if !fileServed {
// We need to trigger authentication flow here if file does not exist to prevent exposing possibly private project existence,
// because the projects override the paths of the namespace project and they might be private even though
// namespace project is public.
if domain.IsNamespaceProject(r) {
if a.Auth.CheckAuthenticationWithoutProject(w, r) {
return
}
httperrors.Serve404(w)
return
}
domain.ServeNotFoundHTTP(w, r)
}
})
}
// httpInitialMiddleware sets up HTTP requests
func (a *theApp) httpInitialMiddleware(handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
https := r.TLS != nil
r = request.WithHTTPSFlag(r, https)
handler.ServeHTTP(w, r)
})
}
// proxyInitialMiddleware sets up proxy requests
func (a *theApp) proxyInitialMiddleware(handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
forwardedProto := r.Header.Get(xForwardedProto)
https := forwardedProto == xForwardedProtoHTTPS
r = request.WithHTTPSFlag(r, https)
if forwardedHost := r.Header.Get(xForwardedHost); forwardedHost != "" {
r.Host = forwardedHost
}
handler.ServeHTTP(w, r)
})
}
func (a *theApp) buildHandlerPipeline() (http.Handler, error) {
// Handlers should be applied in reverse order
handler := a.serveFileOrNotFoundHandler()
if !a.DisableCrossOriginRequests {
handler = corsHandler.Handler(handler)
}
handler = a.accessControlMiddleware(handler)
handler = a.auxiliaryMiddleware(handler)
handler = a.authMiddleware(handler)
handler = a.acmeMiddleware(handler)
handler = a.customHeadersMiddleware(handler)
handler, err := logging.AccessLogger(handler, a.LogFormat)
if err != nil {
return nil, err
}
// Metrics
metricsMiddleware := metrics.NewHandlerFactory(metrics.WithNamespace("gitlab_pages"))
handler = metricsMiddleware(handler)
handler = a.routingMiddleware(handler)
return handler, nil
}
func (a *theApp) Run() {
var wg sync.WaitGroup
limiter := netutil.NewLimiter(a.MaxConns)
// Use a common pipeline to use a single instance of each handler,
// instead of making two nearly identical pipelines
commonHandlerPipeline, err := a.buildHandlerPipeline()
if err != nil {
log.WithError(err).Fatal("Unable to configure pipeline")
}
proxyHandler := a.proxyInitialMiddleware(commonHandlerPipeline)
httpHandler := a.httpInitialMiddleware(commonHandlerPipeline)
// Listen for HTTP
for _, fd := range a.ListenHTTP {
a.listenHTTPFD(&wg, fd, httpHandler, limiter)
}
// Listen for HTTPS
for _, fd := range a.ListenHTTPS {
a.listenHTTPSFD(&wg, fd, httpHandler, limiter)
}
// Listen for HTTP proxy requests
for _, fd := range a.ListenProxy {
a.listenProxyFD(&wg, fd, proxyHandler, limiter)
}
// Serve metrics for Prometheus
if a.ListenMetrics != 0 {
a.listenMetricsFD(&wg, a.ListenMetrics)
}
a.listenAdminUnix(&wg)
a.listenAdminHTTPS(&wg)
a.domains.Watch(a.Domain)
wg.Wait()
}
func (a *theApp) listenHTTPFD(wg *sync.WaitGroup, fd uintptr, httpHandler http.Handler, limiter *netutil.Limiter) {
wg.Add(1)
go func() {
defer wg.Done()
err := listenAndServe(fd, httpHandler, a.HTTP2, nil, limiter)
if err != nil {
capturingFatal(err, errortracking.WithField("listener", "http"))
}
}()
}
func (a *theApp) listenHTTPSFD(wg *sync.WaitGroup, fd uintptr, httpHandler http.Handler, limiter *netutil.Limiter) {
wg.Add(1)
go func() {
defer wg.Done()
err := listenAndServeTLS(fd, a.RootCertificate, a.RootKey, httpHandler, a.ServeTLS, a.InsecureCiphers, a.TLSMinVersion, a.TLSMaxVersion, a.HTTP2, limiter)
if err != nil {
capturingFatal(err, errortracking.WithField("listener", "https"))
}
}()
}
func (a *theApp) listenProxyFD(wg *sync.WaitGroup, fd uintptr, proxyHandler http.Handler, limiter *netutil.Limiter) {
wg.Add(1)
go func() {
wg.Add(1)
go func(fd uintptr) {
defer wg.Done()
err := listenAndServe(fd, proxyHandler, a.HTTP2, nil, limiter)
if err != nil {
capturingFatal(err, errortracking.WithField("listener", "http proxy"))
}
}(fd)
}()
}
func (a *theApp) listenMetricsFD(wg *sync.WaitGroup, fd uintptr) {
wg.Add(1)
go func() {
defer wg.Done()
handler := promhttp.Handler()
err := listenAndServe(fd, handler, false, nil, nil)
if err != nil {
capturingFatal(err, errortracking.WithField("listener", "metrics"))
}
}()
}
func (a *theApp) listenAdminUnix(wg *sync.WaitGroup) {
fd := a.ListenAdminUnix
if fd == 0 {
return
}
wg.Add(1)
go func() {
defer wg.Done()
l, err := net.FileListener(os.NewFile(fd, "[admin-socket-unix]"))
if err != nil {
errortracking.Capture(err, errortracking.WithField("listener", "admin unix socket"))
fatal(fmt.Errorf("failed to listen on FD %d: %v", fd, err))
}
defer l.Close()
if err := admin.NewServer(string(a.AdminToken)).Serve(l); err != nil {
fatal(err)
}
}()
}
func (a *theApp) listenAdminHTTPS(wg *sync.WaitGroup) {
fd := a.ListenAdminHTTPS
if fd == 0 {
return
}
cert, err := tls.X509KeyPair(a.AdminCertificate, a.AdminKey)
if err != nil {
capturingFatal(err)
}
wg.Add(1)
go func() {
defer wg.Done()
l, err := net.FileListener(os.NewFile(fd, "[admin-socket-https]"))
if err != nil {
errMsg := fmt.Errorf("failed to listen on FD %d: %v", fd, err)
log.WithError(errMsg).Error("error")
capturingFatal(err, errortracking.WithField("listener", "admin https socket"))
}
defer l.Close()
if err := admin.NewTLSServer(string(a.AdminToken), &cert).Serve(l); err != nil {
fatal(err)
}
}()
}
func runApp(config appConfig) {
a := theApp{appConfig: config, domains: new(source.Domains)}
err := logging.ConfigureLogging(a.LogFormat, a.LogVerbose)
if err != nil {
log.WithError(err).Fatal("Failed to initialize logging")
}
if config.ArtifactsServer != "" {
a.Artifact = artifact.New(config.ArtifactsServer, config.ArtifactsServerTimeout, config.Domain)
}
if config.ClientID != "" {
a.Auth = auth.New(config.Domain, config.StoreSecret, config.ClientID, config.ClientSecret,
config.RedirectURI, config.GitLabServer)
}
if config.GitLabServer != "" {
a.AcmeMiddleware = &acme.Middleware{GitlabURL: config.GitLabServer}
}
if len(config.CustomHeaders) != 0 {
customHeaders, err := headerConfig.ParseHeaderString(config.CustomHeaders)
if err != nil {
log.WithError(err).Fatal("Unable to parse header string")
}
a.CustomHeaders = customHeaders
}
if err := mimedb.LoadTypes(); err != nil {
log.WithError(err).Warn("Loading extended MIME database failed")
}
a.Run()
}
// fatal will log a fatal error and exit.
func fatal(err error) {
log.WithError(err).Fatal()
}
|