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// Copyright 2022 The Sigstore Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package app
import (
"context"
"crypto/tls"
"errors"
"fmt"
"net"
"net/http"
"os"
"os/signal"
"strconv"
"strings"
"sync"
"syscall"
"time"
"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/rs/cors"
gw "github.com/sigstore/fulcio/pkg/generated/protobuf"
legacy_gw "github.com/sigstore/fulcio/pkg/generated/protobuf/legacy"
"github.com/sigstore/fulcio/pkg/log"
"github.com/sigstore/fulcio/pkg/server"
"github.com/spf13/viper"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/credentials/insecure"
health "google.golang.org/grpc/health/grpc_health_v1"
"google.golang.org/grpc/metadata"
"google.golang.org/protobuf/proto"
)
type httpServer struct {
*http.Server
httpServerEndpoint string
}
func extractOIDCTokenFromAuthHeader(_ context.Context, req *http.Request) metadata.MD {
token := strings.Replace(req.Header.Get("Authorization"), "Bearer ", "", 1)
return metadata.Pairs(server.MetadataOIDCTokenKey, token)
}
func createHTTPServer(ctx context.Context, serverEndpoint string, grpcServer, legacyGRPCServer *grpcServer) httpServer {
opts := []grpc.DialOption{}
if grpcServer.ExposesGRPCTLS() {
/* #nosec G402 */ // InsecureSkipVerify is only used for the HTTP server to call the TLS-enabled grpc endpoint.
opts = append(opts, grpc.WithTransportCredentials(credentials.NewTLS(&tls.Config{InsecureSkipVerify: true})))
} else {
opts = append(opts, grpc.WithTransportCredentials(insecure.NewCredentials()))
}
_, port, err := net.SplitHostPort(grpcServer.grpcServerEndpoint)
if err != nil {
log.Logger.Fatal(err)
}
grpcServerEndpoint := fmt.Sprintf("localhost:%s", port)
cc, err := grpc.NewClient(grpcServerEndpoint, opts...)
if err != nil {
log.Logger.Fatal(err)
}
mux := runtime.NewServeMux(runtime.WithMetadata(extractOIDCTokenFromAuthHeader),
runtime.WithForwardResponseOption(setResponseCodeModifier),
runtime.WithHealthzEndpoint(health.NewHealthClient(cc)))
if err := gw.RegisterCAHandlerFromEndpoint(ctx, mux, grpcServerEndpoint, opts); err != nil {
log.Logger.Fatal(err)
}
if legacyGRPCServer != nil {
endpoint := fmt.Sprintf("unix:%v", legacyGRPCServer.grpcServerEndpoint)
// we are connecting over a unix domain socket, therefore we won't ever need TLS
unixDomainSocketOpts := []grpc.DialOption{grpc.WithTransportCredentials(insecure.NewCredentials())}
if err := legacy_gw.RegisterCAHandlerFromEndpoint(ctx, mux, endpoint, unixDomainSocketOpts); err != nil {
log.Logger.Fatal(err)
}
}
// Limit request size
handler := server.WithMaxBytes(mux, maxMsgSize)
handler = promhttp.InstrumentHandlerDuration(server.MetricLatency, handler)
handler = promhttp.InstrumentHandlerCounter(server.RequestsCount, handler)
// enable CORS
// cors.Default() configures to accept requests for all domains
handler = cors.Default().Handler(handler)
api := http.Server{
Addr: serverEndpoint,
Handler: handler,
// Timeouts
ReadTimeout: 60 * time.Second,
ReadHeaderTimeout: 60 * time.Second,
WriteTimeout: 60 * time.Second,
IdleTimeout: viper.GetDuration("idle-connection-timeout"),
}
return httpServer{&api, serverEndpoint}
}
func (h httpServer) startListener(wg *sync.WaitGroup) {
log.Logger.Infof("listening on http at %s", h.httpServerEndpoint)
idleConnsClosed := make(chan struct{})
go func() {
sigint := make(chan os.Signal, 1)
signal.Notify(sigint, syscall.SIGINT, syscall.SIGTERM)
<-sigint
// received an interrupt signal, shut down
if err := h.Shutdown(context.Background()); err != nil {
// error from closing listeners, or context timeout
log.Logger.Errorf("HTTP server Shutdown: %v", err)
}
close(idleConnsClosed)
log.Logger.Info("stopped http server")
}()
wg.Add(1)
go func() {
if err := h.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
log.Logger.Fatal(err)
}
<-idleConnsClosed
wg.Done()
log.Logger.Info("http server shutdown")
}()
}
func setResponseCodeModifier(ctx context.Context, w http.ResponseWriter, _ proto.Message) error {
md, ok := runtime.ServerMetadataFromContext(ctx)
if !ok {
return nil
}
// set SCT if present ahead of modifying response code
if vals := md.HeaderMD.Get(server.SCTMetadataKey); len(vals) > 0 {
delete(md.HeaderMD, server.SCTMetadataKey)
delete(w.Header(), "Grpc-Metadata-sct")
w.Header().Set("SCT", vals[0])
}
// strip all GRPC response headers
for headerKey := range w.Header() {
if strings.HasPrefix(headerKey, "Grpc-") {
delete(w.Header(), headerKey)
}
}
// set http status code
if vals := md.HeaderMD.Get(server.HTTPResponseCodeMetadataKey); len(vals) > 0 {
code, err := strconv.Atoi(vals[0])
if err != nil {
return err
}
// delete the headers to not expose any grpc-metadata in http response
delete(md.HeaderMD, server.HTTPResponseCodeMetadataKey)
w.WriteHeader(code)
}
return nil
}
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