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|
package main
import (
"crypto/tls"
"fmt"
"net"
"net/http"
"os"
"strconv"
"strings"
"sync"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/rs/cors"
log "github.com/sirupsen/logrus"
mimedb "gitlab.com/lupine/go-mimedb"
"gitlab.com/gitlab-org/gitlab-pages/internal/admin"
"gitlab.com/gitlab-org/gitlab-pages/internal/artifact"
"gitlab.com/gitlab-org/gitlab-pages/internal/auth"
"gitlab.com/gitlab-org/gitlab-pages/internal/domain"
"gitlab.com/gitlab-org/gitlab-pages/internal/httperrors"
"gitlab.com/gitlab-org/gitlab-pages/metrics"
)
const (
xForwardedProto = "X-Forwarded-Proto"
xForwardedHost = "X-Forwarded-Host"
xForwardedProtoHTTPS = "https"
)
var (
corsHandler = cors.New(cors.Options{AllowedMethods: []string{"GET"}})
)
type theApp struct {
appConfig
dm domain.Map
lock sync.RWMutex
Artifact *artifact.Artifact
Auth *auth.Auth
}
func (a *theApp) isReady() bool {
return a.dm != nil
}
func (a *theApp) domain(host string) *domain.D {
host = strings.ToLower(host)
a.lock.RLock()
defer a.lock.RUnlock()
domain, _ := a.dm[host]
return domain
}
func (a *theApp) ServeTLS(ch *tls.ClientHelloInfo) (*tls.Certificate, error) {
if ch.ServerName == "" {
return nil, nil
}
if domain := a.domain(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.D) {
host, _, err := net.SplitHostPort(r.Host)
if err != nil {
host = r.Host
}
return host, a.domain(host)
}
func (a *theApp) checkAuthenticationIfNotExists(domain *domain.D, w http.ResponseWriter, r *http.Request) bool {
if domain == nil || domain.GetID(r) == 0 {
// 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 false
}
func (a *theApp) tryAuxiliaryHandlers(w http.ResponseWriter, r *http.Request, https bool, host string, domain *domain.D) 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
}
func (a *theApp) serveContent(ww http.ResponseWriter, r *http.Request, https bool) {
w := newLoggingResponseWriter(ww)
defer w.Log(r)
metrics.SessionsActive.Inc()
defer metrics.SessionsActive.Dec()
host, domain := a.getHostAndDomain(r)
if a.Auth.TryAuthenticate(&w, r) {
return
}
if a.tryAuxiliaryHandlers(&w, r, https, host, domain) {
return
}
// Only for projects that have access control enabled
if domain.IsAccessControlEnabled(r) {
log.Debug("Authenticate request")
if a.Auth.CheckAuthentication(&w, r, domain.GetID(r)) {
return
}
}
// Serve static file, applying CORS headers if necessary
if a.DisableCrossOriginRequests {
domain.ServeHTTP(&w, r)
} else {
corsHandler.ServeHTTP(&w, r, domain.ServeHTTP)
}
metrics.ProcessedRequests.WithLabelValues(strconv.Itoa(w.status), r.Method).Inc()
}
func (a *theApp) ServeHTTP(ww http.ResponseWriter, r *http.Request) {
https := r.TLS != nil
a.serveContent(ww, r, https)
}
func (a *theApp) ServeProxy(ww http.ResponseWriter, r *http.Request) {
forwardedProto := r.Header.Get(xForwardedProto)
https := forwardedProto == xForwardedProtoHTTPS
if forwardedHost := r.Header.Get(xForwardedHost); forwardedHost != "" {
r.Host = forwardedHost
}
a.serveContent(ww, r, https)
}
func (a *theApp) UpdateDomains(dm domain.Map) {
a.lock.Lock()
defer a.lock.Unlock()
a.dm = dm
}
func (a *theApp) Run() {
var wg sync.WaitGroup
// Listen for HTTP
for _, fd := range a.ListenHTTP {
wg.Add(1)
go func(fd uintptr) {
defer wg.Done()
err := listenAndServe(fd, a.ServeHTTP, a.HTTP2, nil)
if err != nil {
fatal(err)
}
}(fd)
}
// Listen for HTTPS
for _, fd := range a.ListenHTTPS {
wg.Add(1)
go func(fd uintptr) {
defer wg.Done()
err := listenAndServeTLS(fd, a.RootCertificate, a.RootKey, a.ServeHTTP, a.ServeTLS, a.HTTP2)
if err != nil {
fatal(err)
}
}(fd)
}
// Listen for HTTP proxy requests
for _, fd := range a.ListenProxy {
wg.Add(1)
go func(fd uintptr) {
defer wg.Done()
err := listenAndServe(fd, a.ServeProxy, a.HTTP2, nil)
if err != nil {
fatal(err)
}
}(fd)
}
// Serve metrics for Prometheus
if a.ListenMetrics != 0 {
wg.Add(1)
go func(fd uintptr) {
defer wg.Done()
handler := promhttp.HandlerFor(prometheus.DefaultGatherer, promhttp.HandlerOpts{}).ServeHTTP
err := listenAndServe(fd, handler, false, nil)
if err != nil {
fatal(err)
}
}(a.ListenMetrics)
}
a.listenAdminUnix(&wg)
a.listenAdminHTTPS(&wg)
go domain.Watch(a.Domain, a.UpdateDomains, time.Second)
wg.Wait()
}
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 {
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 {
fatal(err)
}
wg.Add(1)
go func() {
defer wg.Done()
l, err := net.FileListener(os.NewFile(fd, "[admin-socket-https]"))
if err != nil {
fatal(fmt.Errorf("failed to listen on FD %d: %v", fd, err))
}
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}
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)
}
configureLogging(config.LogFormat, config.LogVerbose)
if err := mimedb.LoadTypes(); err != nil {
log.WithError(err).Warn("Loading extended MIME database failed")
}
a.Run()
}
|