refactor: centralize HTTP transport configuration (#9058)

Signed-off-by: knqyf263 <knqyf263@gmail.com>

pkg/cache/remote.go

@@ -2,7 +2,6 @@ package cache
 
 import (
 	"context"
-	"crypto/tls"
 	"net/http"
 
 	"github.com/twitchtv/twirp"
@@ -11,6 +10,7 @@ import (
 	"github.com/aquasecurity/trivy/pkg/fanal/types"
 	"github.com/aquasecurity/trivy/pkg/rpc"
 	"github.com/aquasecurity/trivy/pkg/rpc/client"
+	xhttp "github.com/aquasecurity/trivy/pkg/x/http"
 	rpcCache "github.com/aquasecurity/trivy/rpc/cache"
 )
 
@@ -19,7 +19,6 @@ var _ ArtifactCache = (*RemoteCache)(nil)
 type RemoteOptions struct {
 	ServerAddr    string
 	CustomHeaders http.Header
-	Insecure      bool
 	PathPrefix    string
 }
 
@@ -30,23 +29,14 @@ type RemoteCache struct {
 }
 
 // NewRemoteCache is the factory method for RemoteCache
-func NewRemoteCache(opts RemoteOptions) *RemoteCache {
-	ctx := client.WithCustomHeaders(context.Background(), opts.CustomHeaders)
-
-	httpClient := &http.Client{
-		Transport: &http.Transport{
-			Proxy: http.ProxyFromEnvironment,
-			TLSClientConfig: &tls.Config{
-				InsecureSkipVerify: opts.Insecure,
-			},
-		},
-	}
+func NewRemoteCache(ctx context.Context, opts RemoteOptions) *RemoteCache {
+	ctx = client.WithCustomHeaders(ctx, opts.CustomHeaders)
 
 	var twirpOpts []twirp.ClientOption
 	if opts.PathPrefix != "" {
 		twirpOpts = append(twirpOpts, twirp.WithClientPathPrefix(opts.PathPrefix))
 	}
-	c := rpcCache.NewCacheProtobufClient(opts.ServerAddr, httpClient, twirpOpts...)
+	c := rpcCache.NewCacheProtobufClient(opts.ServerAddr, xhttp.ClientWithContext(ctx), twirpOpts...)
 	return &RemoteCache{
 		ctx:    ctx,
 		client: c,

pkg/cache/remote_test.go

@@ -16,6 +16,7 @@ import (
 
 	"github.com/aquasecurity/trivy/pkg/cache"
 	"github.com/aquasecurity/trivy/pkg/fanal/types"
+	xhttp "github.com/aquasecurity/trivy/pkg/x/http"
 	rpcCache "github.com/aquasecurity/trivy/rpc/cache"
 	rpcScanner "github.com/aquasecurity/trivy/rpc/scanner"
 )
@@ -145,10 +146,9 @@ func TestRemoteCache_PutArtifact(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			c := cache.NewRemoteCache(cache.RemoteOptions{
+			c := cache.NewRemoteCache(t.Context(), cache.RemoteOptions{
 				ServerAddr:    ts.URL,
 				CustomHeaders: tt.args.customHeaders,
-				Insecure:      false,
 			})
 			err := c.PutArtifact(tt.args.imageID, tt.args.imageInfo)
 			if tt.wantErr != "" {
@@ -208,10 +208,9 @@ func TestRemoteCache_PutBlob(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			c := cache.NewRemoteCache(cache.RemoteOptions{
+			c := cache.NewRemoteCache(t.Context(), cache.RemoteOptions{
 				ServerAddr:    ts.URL,
 				CustomHeaders: tt.args.customHeaders,
-				Insecure:      false,
 			})
 			err := c.PutBlob(tt.args.diffID, tt.args.layerInfo)
 			if tt.wantErr != "" {
@@ -288,10 +287,9 @@ func TestRemoteCache_MissingBlobs(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			c := cache.NewRemoteCache(cache.RemoteOptions{
+			c := cache.NewRemoteCache(t.Context(), cache.RemoteOptions{
 				ServerAddr:    ts.URL,
 				CustomHeaders: tt.args.customHeaders,
-				Insecure:      false,
 			})
 			gotMissingImage, gotMissingLayerIDs, err := c.MissingBlobs(tt.args.imageID, tt.args.layerIDs)
 			if tt.wantErr != "" {
@@ -339,10 +337,12 @@ func TestRemoteCache_PutArtifactInsecure(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			c := cache.NewRemoteCache(cache.RemoteOptions{
+			ctx := xhttp.WithTransport(t.Context(), xhttp.NewTransport(xhttp.Options{
+				Insecure: tt.args.insecure,
+			}))
+			c := cache.NewRemoteCache(ctx, cache.RemoteOptions{
 				ServerAddr:    ts.URL,
 				CustomHeaders: nil,
-				Insecure:      tt.args.insecure,
 			})
 			err := c.PutArtifact(tt.args.imageID, tt.args.imageInfo)
 			if tt.wantErr != "" {

pkg/commands/artifact/run.go

@@ -34,6 +34,7 @@ import (
 	"github.com/aquasecurity/trivy/pkg/scan"
 	"github.com/aquasecurity/trivy/pkg/types"
 	"github.com/aquasecurity/trivy/pkg/version/doc"
+	xhttp "github.com/aquasecurity/trivy/pkg/x/http"
 )
 
 // TargetKind represents what kind of artifact Trivy scans
@@ -118,6 +119,12 @@ func NewRunner(ctx context.Context, cliOptions flag.Options, opts ...RunnerOptio
 		opt(r)
 	}
 
+	// Set the default HTTP transport
+	xhttp.SetDefaultTransport(xhttp.NewTransport(xhttp.Options{
+		Insecure: cliOptions.Insecure,
+		Timeout:  cliOptions.Timeout,
+	}))
+
 	// If the user has not disabled notices or is running in quiet mode
 	r.versionChecker = notification.NewVersionChecker(
 		notification.WithSkipVersionCheck(cliOptions.SkipVersionCheck),

pkg/commands/artifact/wire_gen.go

@@ -195,7 +195,7 @@ func initializeRemoteImageScanService(ctx context.Context, imageName string, rem
 	if err != nil {
 		return scan.Service{}, nil, err
 	}
-	remoteCache := cache.NewRemoteCache(remoteCacheOptions)
+	remoteCache := cache.NewRemoteCache(ctx, remoteCacheOptions)
 	artifactArtifact, err := image2.NewArtifact(typesImage, remoteCache, artifactOption)
 	if err != nil {
 		cleanup()
@@ -220,7 +220,7 @@ func initializeRemoteArchiveScanService(ctx context.Context, filePath string, re
 	if err != nil {
 		return scan.Service{}, nil, err
 	}
-	remoteCache := cache.NewRemoteCache(remoteCacheOptions)
+	remoteCache := cache.NewRemoteCache(ctx, remoteCacheOptions)
 	artifactArtifact, err := image2.NewArtifact(typesImage, remoteCache, artifactOption)
 	if err != nil {
 		return scan.Service{}, nil, err
@@ -234,7 +234,7 @@ func initializeRemoteArchiveScanService(ctx context.Context, filePath string, re
 func initializeRemoteFilesystemScanService(ctx context.Context, path string, remoteCacheOptions cache.RemoteOptions, remoteScanOptions client.ServiceOption, artifactOption artifact.Option) (scan.Service, func(), error) {
 	v := _wireValue
 	service := client.NewService(remoteScanOptions, v...)
-	remoteCache := cache.NewRemoteCache(remoteCacheOptions)
+	remoteCache := cache.NewRemoteCache(ctx, remoteCacheOptions)
 	fs := walker.NewFS()
 	artifactArtifact, err := local2.NewArtifact(path, remoteCache, fs, artifactOption)
 	if err != nil {
@@ -249,7 +249,7 @@ func initializeRemoteFilesystemScanService(ctx context.Context, path string, rem
 func initializeRemoteRepositoryScanService(ctx context.Context, url string, remoteCacheOptions cache.RemoteOptions, remoteScanOptions client.ServiceOption, artifactOption artifact.Option) (scan.Service, func(), error) {
 	v := _wireValue
 	service := client.NewService(remoteScanOptions, v...)
-	remoteCache := cache.NewRemoteCache(remoteCacheOptions)
+	remoteCache := cache.NewRemoteCache(ctx, remoteCacheOptions)
 	fs := walker.NewFS()
 	artifactArtifact, cleanup, err := repo.NewArtifact(url, remoteCache, fs, artifactOption)
 	if err != nil {
@@ -265,7 +265,7 @@ func initializeRemoteRepositoryScanService(ctx context.Context, url string, remo
 func initializeRemoteSBOMScanService(ctx context.Context, path string, remoteCacheOptions cache.RemoteOptions, remoteScanOptions client.ServiceOption, artifactOption artifact.Option) (scan.Service, func(), error) {
 	v := _wireValue
 	service := client.NewService(remoteScanOptions, v...)
-	remoteCache := cache.NewRemoteCache(remoteCacheOptions)
+	remoteCache := cache.NewRemoteCache(ctx, remoteCacheOptions)
 	artifactArtifact, err := sbom.NewArtifact(path, remoteCache, artifactOption)
 	if err != nil {
 		return scan.Service{}, nil, err
@@ -279,7 +279,7 @@ func initializeRemoteSBOMScanService(ctx context.Context, path string, remoteCac
 func initializeRemoteVMScanService(ctx context.Context, path string, remoteCacheOptions cache.RemoteOptions, remoteScanOptions client.ServiceOption, artifactOption artifact.Option) (scan.Service, func(), error) {
 	v := _wireValue
 	service := client.NewService(remoteScanOptions, v...)
-	remoteCache := cache.NewRemoteCache(remoteCacheOptions)
+	remoteCache := cache.NewRemoteCache(ctx, remoteCacheOptions)
 	walkerVM := walker.NewVM()
 	artifactArtifact, err := vm.NewArtifact(path, remoteCache, walkerVM, artifactOption)
 	if err != nil {

pkg/commands/auth/run.go

@@ -2,19 +2,18 @@ package auth
 
 import (
 	"context"
-	"net/http"
 	"os"
 
 	"github.com/docker/cli/cli/config"
 	"github.com/docker/cli/cli/config/types"
 	"github.com/google/go-containerregistry/pkg/authn"
 	"github.com/google/go-containerregistry/pkg/name"
-	"github.com/google/go-containerregistry/pkg/v1/remote"
 	"github.com/google/go-containerregistry/pkg/v1/remote/transport"
 	"golang.org/x/xerrors"
 
 	"github.com/aquasecurity/trivy/pkg/flag"
 	"github.com/aquasecurity/trivy/pkg/log"
+	xhttp "github.com/aquasecurity/trivy/pkg/x/http"
 )
 
 func Login(ctx context.Context, registry string, opts flag.Options) error {
@@ -34,7 +33,7 @@ func Login(ctx context.Context, registry string, opts flag.Options) error {
 	_, err = transport.NewWithContext(ctx, reg, &authn.Basic{
 		Username: opts.Credentials[0].Username,
 		Password: opts.Credentials[0].Password,
-	}, httpTransport(opts), nil)
+	}, xhttp.Transport(ctx), nil)
 	if err != nil {
 		return xerrors.Errorf("failed to authenticate: %w", err)
 	}
@@ -99,11 +98,3 @@ func parseRegistry(registry string, opts flag.Options) (name.Registry, error) {
 	}
 	return reg, nil
 }
-
-func httpTransport(opts flag.Options) *http.Transport {
-	tr := remote.DefaultTransport.(*http.Transport).Clone()
-	if opts.Insecure {
-		tr.TLSClientConfig.InsecureSkipVerify = true
-	}
-	return tr
-}

pkg/dependency/parser/java/pom/parse.go

@@ -23,6 +23,7 @@ import (
 	ftypes "github.com/aquasecurity/trivy/pkg/fanal/types"
 	"github.com/aquasecurity/trivy/pkg/log"
 	"github.com/aquasecurity/trivy/pkg/set"
+	xhttp "github.com/aquasecurity/trivy/pkg/x/http"
 	xio "github.com/aquasecurity/trivy/pkg/x/io"
 )
 
@@ -742,7 +743,7 @@ func (p *Parser) fetchPomFileNameFromMavenMetadata(repo string, paths []string)
 		return "", nil
 	}
 
-	client := &http.Client{}
+	client := xhttp.Client()
 	resp, err := client.Do(req)
 	if err != nil {
 		p.logger.Debug("Failed to fetch", log.String("url", req.URL.String()), log.Err(err))
@@ -776,7 +777,7 @@ func (p *Parser) fetchPOMFromRemoteRepository(repo string, paths []string) (*pom
 		return nil, nil
 	}
 
-	client := &http.Client{}
+	client := xhttp.Client()
 	resp, err := client.Do(req)
 	if err != nil {
 		p.logger.Debug("Failed to fetch", log.String("url", req.URL.String()), log.Err(err))

pkg/downloader/download.go

@@ -3,7 +3,6 @@ package downloader
 import (
 	"cmp"
 	"context"
-	"crypto/tls"
 	"errors"
 	"maps"
 	"net/http"
@@ -13,9 +12,11 @@ import (
 	"time"
 
 	"github.com/google/go-github/v62/github"
-	getter "github.com/hashicorp/go-getter"
+	"github.com/hashicorp/go-getter"
 	"github.com/samber/lo"
 	"golang.org/x/xerrors"
+
+	xhttp "github.com/aquasecurity/trivy/pkg/x/http"
 )
 
 var ErrSkipDownload = errors.New("skip download")
@@ -106,14 +107,12 @@ type CustomTransport struct {
 	auth       Auth
 	cachedETag string
 	newETag    string
-	insecure   bool
 }
 
 func NewCustomTransport(opts Options) *CustomTransport {
 	return &CustomTransport{
 		auth:       opts.Auth,
 		cachedETag: opts.ETag,
-		insecure:   opts.Insecure,
 	}
 }
 
@@ -127,12 +126,9 @@ func (t *CustomTransport) RoundTrip(req *http.Request) (*http.Response, error) {
 		req.SetBasicAuth(t.auth.Username, t.auth.Password)
 	}
 
-	var transport http.RoundTripper
+	transport := xhttp.Transport(req.Context())
 	if req.URL.Host == "github.com" {
-		transport = NewGitHubTransport(req.URL, t.insecure, t.auth.Token)
-	}
-	if transport == nil {
-		transport = httpTransport(t.insecure)
+		transport = NewGitHubTransport(req.URL, t.auth.Token)
 	}
 
 	res, err := transport.RoundTrip(req)
@@ -151,8 +147,8 @@ func (t *CustomTransport) RoundTrip(req *http.Request) (*http.Response, error) {
 	return res, nil
 }
 
-func NewGitHubTransport(u *url.URL, insecure bool, token string) http.RoundTripper {
-	client := newGitHubClient(insecure, token)
+func NewGitHubTransport(u *url.URL, token string) http.RoundTripper {
+	client := newGitHubClient(token)
 	ss := strings.SplitN(u.Path, "/", 4)
 	if len(ss) < 4 || strings.HasPrefix(ss[3], "archive/") || strings.HasPrefix(ss[3], "releases/") ||
 		strings.HasPrefix(ss[3], "tags/") {
@@ -185,17 +181,11 @@ func (t *GitHubContentTransport) RoundTrip(req *http.Request) (*http.Response, e
 	return res.Response, nil
 }
 
-func newGitHubClient(insecure bool, token string) *github.Client {
-	client := github.NewClient(&http.Client{Transport: httpTransport(insecure)})
+func newGitHubClient(token string) *github.Client {
+	client := github.NewClient(xhttp.Client())
 	token = cmp.Or(token, os.Getenv("GITHUB_TOKEN"))
 	if token != "" {
 		client = client.WithAuthToken(token)
 	}
 	return client
 }
-
-func httpTransport(insecure bool) *http.Transport {
-	tr := http.DefaultTransport.(*http.Transport).Clone()
-	tr.TLSClientConfig = &tls.Config{InsecureSkipVerify: insecure}
-	return tr
-}

pkg/downloader/downloader_test.go

@@ -10,6 +10,7 @@ import (
 	"github.com/stretchr/testify/require"
 
 	"github.com/aquasecurity/trivy/pkg/downloader"
+	xhttp "github.com/aquasecurity/trivy/pkg/x/http"
 )
 
 func TestDownload(t *testing.T) {
@@ -42,8 +43,13 @@ func TestDownload(t *testing.T) {
 			// Set up the destination path
 			dst := t.TempDir()
 
+			// Configure the HTTP transport with the insecure option
+			ctx := xhttp.WithTransport(t.Context(), xhttp.NewTransport(xhttp.Options{
+				Insecure: tt.insecure,
+			}))
+
 			// Execute the download
-			_, err := downloader.Download(t.Context(), server.URL, dst, "", downloader.Options{
+			_, err := downloader.Download(ctx, server.URL, dst, "", downloader.Options{
 				Insecure: tt.insecure,
 			})
 

pkg/fanal/test/integration/registry_test.go

@@ -14,7 +14,7 @@ import (
 	"github.com/docker/go-connections/nat"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	testcontainers "github.com/testcontainers/testcontainers-go"
+	"github.com/testcontainers/testcontainers-go"
 	"github.com/testcontainers/testcontainers-go/wait"
 
 	"github.com/aquasecurity/trivy/internal/testutil"
@@ -26,6 +26,7 @@ import (
 	"github.com/aquasecurity/trivy/pkg/fanal/image"
 	testdocker "github.com/aquasecurity/trivy/pkg/fanal/test/integration/docker"
 	"github.com/aquasecurity/trivy/pkg/fanal/types"
+	xhttp "github.com/aquasecurity/trivy/pkg/x/http"
 
 	_ "github.com/aquasecurity/trivy/pkg/fanal/analyzer/all"
 )
@@ -228,6 +229,11 @@ func analyze(t *testing.T, ctx context.Context, imageRef string, opt types.Image
 	}
 	cli.NegotiateAPIVersion(ctx)
 
+	// Configure custom transport with insecure option
+	ctx = xhttp.WithTransport(ctx, xhttp.NewTransport(xhttp.Options{
+		Insecure: opt.RegistryOptions.Insecure,
+	}))
+
 	img, cleanup, err := image.NewContainerImage(ctx, imageRef, opt)
 	if err != nil {
 		return nil, err

pkg/fanal/types/image.go

@@ -88,10 +88,6 @@ type RegistryOptions struct {
 	// SSL/TLS
 	Insecure bool
 
-	// For internal use. Needed for mTLS authentication.
-	ClientCert []byte
-	ClientKey  []byte
-
 	// Architecture
 	Platform Platform
 

pkg/flag/options.go

@@ -517,7 +517,6 @@ func (o *Options) RemoteCacheOpts() cache.RemoteOptions {
 	return cache.RemoteOptions{
 		ServerAddr:    o.ServerAddr,
 		CustomHeaders: o.CustomHeaders,
-		Insecure:      o.Insecure,
 		PathPrefix:    o.PathPrefix,
 	}
 }

pkg/iac/scanners/terraform/parser/resolvers/cache_integration_test.go

@@ -4,7 +4,6 @@ package resolvers_test
 
 import (
 	"context"
-	"crypto/tls"
 	"io/fs"
 	"net/http"
 	"net/http/httptest"
@@ -18,6 +17,7 @@ import (
 	"github.com/aquasecurity/trivy/internal/gittest"
 	"github.com/aquasecurity/trivy/pkg/iac/scanners/terraform/parser/resolvers"
 	"github.com/aquasecurity/trivy/pkg/log"
+	xhttp "github.com/aquasecurity/trivy/pkg/x/http"
 )
 
 type moduleResolver interface {
@@ -73,9 +73,7 @@ func TestResolveModuleFromCache(t *testing.T) {
 			opts: resolvers.Options{
 				Source: registryAddress + "/terraform-aws-modules/s3-bucket/aws",
 				Client: &http.Client{
-					Transport: &http.Transport{
-						TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
-					},
+					Transport: xhttp.NewTransport(xhttp.Options{Insecure: true}),
 				},
 			},
 			firstResolver:  resolvers.Registry,
@@ -87,9 +85,7 @@ func TestResolveModuleFromCache(t *testing.T) {
 			opts: resolvers.Options{
 				Source: registryAddress + "/terraform-aws-modules/s3-bucket/aws//modules/object",
 				Client: &http.Client{
-					Transport: &http.Transport{
-						TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
-					},
+					Transport: xhttp.NewTransport(xhttp.Options{Insecure: true}),
 				},
 			},
 			firstResolver:  resolvers.Registry,

pkg/iac/scanners/terraform/parser/resolvers/registry.go

@@ -16,6 +16,7 @@ import (
 
 	"github.com/aquasecurity/go-version/pkg/version"
 	"github.com/aquasecurity/trivy/pkg/log"
+	xhttp "github.com/aquasecurity/trivy/pkg/x/http"
 )
 
 type registryResolver struct {
@@ -23,10 +24,8 @@ type registryResolver struct {
 }
 
 var Registry = &registryResolver{
-	client: &http.Client{
 	// give it a maximum 5 seconds to resolve the module
-		Timeout: time.Second * 5,
-	},
+	client: xhttp.Client(xhttp.WithTimeout(5 * time.Second)),
 }
 
 type moduleVersions struct {

pkg/notification/notice.go

@@ -14,6 +14,7 @@ import (
 	"github.com/aquasecurity/go-version/pkg/semver"
 	"github.com/aquasecurity/trivy/pkg/log"
 	"github.com/aquasecurity/trivy/pkg/version/app"
+	xhttp "github.com/aquasecurity/trivy/pkg/x/http"
 )
 
 type VersionChecker struct {
@@ -60,9 +61,7 @@ func (v *VersionChecker) RunUpdateCheck(ctx context.Context, args []string) {
 	go func() {
 		logger.Debug("Running version check")
 		args = getFlags(args)
-		client := &http.Client{
-			Timeout: 3 * time.Second,
-		}
+		client := xhttp.ClientWithContext(ctx, xhttp.WithTimeout(3*time.Second))
 
 		req, err := http.NewRequestWithContext(ctx, http.MethodGet, v.updatesApi, http.NoBody)
 		if err != nil {

pkg/remote/remote.go

@@ -2,20 +2,15 @@ package remote
 
 import (
 	"context"
-	"crypto/tls"
 	"errors"
-	"fmt"
-	"net"
 	"net/http"
 	"strings"
-	"time"
 
 	"github.com/google/go-containerregistry/pkg/authn"
 	"github.com/google/go-containerregistry/pkg/authn/github"
 	"github.com/google/go-containerregistry/pkg/name"
 	v1 "github.com/google/go-containerregistry/pkg/v1"
 	"github.com/google/go-containerregistry/pkg/v1/remote"
-	"github.com/google/go-containerregistry/pkg/v1/remote/transport"
 	v1types "github.com/google/go-containerregistry/pkg/v1/types"
 	"github.com/hashicorp/go-multierror"
 	"github.com/samber/lo"
@@ -24,7 +19,7 @@ import (
 	"github.com/aquasecurity/trivy/pkg/fanal/image/registry"
 	"github.com/aquasecurity/trivy/pkg/fanal/types"
 	"github.com/aquasecurity/trivy/pkg/log"
-	"github.com/aquasecurity/trivy/pkg/version/app"
+	xhttp "github.com/aquasecurity/trivy/pkg/x/http"
 )
 
 type Descriptor = remote.Descriptor
@@ -32,13 +27,8 @@ type Descriptor = remote.Descriptor
 // Get is a wrapper of google/go-containerregistry/pkg/v1/remote.Get
 // so that it can try multiple authentication methods.
 func Get(ctx context.Context, ref name.Reference, option types.RegistryOptions) (*Descriptor, error) {
-	tr, err := httpTransport(option)
-	if err != nil {
-		return nil, xerrors.Errorf("failed to create http transport: %w", err)
-	}
-
 	return tryWithMirrors(ref, option, func(r name.Reference) (*Descriptor, error) {
-		return tryGet(ctx, tr, r, option)
+		return tryGet(ctx, xhttp.Transport(ctx), r, option)
 	})
 }
 
@@ -81,13 +71,8 @@ func tryGet(ctx context.Context, tr http.RoundTripper, ref name.Reference, optio
 // Image is a wrapper of google/go-containerregistry/pkg/v1/remote.Image
 // so that it can try multiple authentication methods.
 func Image(ctx context.Context, ref name.Reference, option types.RegistryOptions) (v1.Image, error) {
-	tr, err := httpTransport(option)
-	if err != nil {
-		return nil, xerrors.Errorf("failed to create http transport: %w", err)
-	}
-
 	return tryWithMirrors(ref, option, func(r name.Reference) (v1.Image, error) {
-		return tryImage(ctx, tr, r, option)
+		return tryImage(ctx, xhttp.Transport(ctx), r, option)
 	})
 }
 
@@ -148,16 +133,11 @@ func tryImage(ctx context.Context, tr http.RoundTripper, ref name.Reference, opt
 // Referrers is a wrapper of google/go-containerregistry/pkg/v1/remote.Referrers
 // so that it can try multiple authentication methods.
 func Referrers(ctx context.Context, d name.Digest, option types.RegistryOptions) (v1.ImageIndex, error) {
-	tr, err := httpTransport(option)
-	if err != nil {
-		return nil, xerrors.Errorf("failed to create http transport: %w", err)
-	}
-
 	var errs error
 	// Try each authentication method until it succeeds
 	for _, authOpt := range authOptions(ctx, d, option) {
 		remoteOpts := []remote.Option{
-			remote.WithTransport(tr),
+			remote.WithTransport(xhttp.Transport(ctx)),
 			authOpt,
 		}
 		index, err := remote.Referrers(d, remoteOpts...)
@@ -197,26 +177,6 @@ func registryMirrors(hostRef name.Reference, option types.RegistryOptions) ([]na
 	return mirrors, nil
 }
 
-func httpTransport(option types.RegistryOptions) (http.RoundTripper, error) {
-	d := &net.Dialer{
-		Timeout: 10 * time.Minute,
-	}
-	tr := http.DefaultTransport.(*http.Transport).Clone()
-	tr.DialContext = d.DialContext
-	tr.TLSClientConfig = &tls.Config{InsecureSkipVerify: option.Insecure}
-
-	if len(option.ClientCert) != 0 && len(option.ClientKey) != 0 {
-		cert, err := tls.X509KeyPair(option.ClientCert, option.ClientKey)
-		if err != nil {
-			return nil, err
-		}
-		tr.TLSClientConfig.Certificates = []tls.Certificate{cert}
-	}
-
-	tripper := transport.NewUserAgent(tr, fmt.Sprintf("trivy/%s", app.Version()))
-	return tripper, nil
-}
-
 func authOptions(ctx context.Context, ref name.Reference, option types.RegistryOptions) []remote.Option {
 	var opts []remote.Option
 	for _, cred := range option.Credentials {

pkg/remote/remote_test.go

@@ -368,8 +368,8 @@ func TestUserAgents(t *testing.T) {
 	require.NoError(t, err)
 
 	require.Len(t, tracker.agents, 1)
-	ok := tracker.agents.Contains(fmt.Sprintf("trivy/%s go-containerregistry", app.Version()))
-	require.True(t, ok, `user-agent header equals to "trivy/dev go-containerregistry"`)
+	ok := tracker.agents.Contains(fmt.Sprintf("trivy/%s", app.Version()))
+	require.True(t, ok, `user-agent header equals to "trivy/dev"`)
 }
 
 func localImage(t *testing.T) v1.Image {

pkg/rpc/client/client.go

@@ -2,7 +2,6 @@ package client
 
 import (
 	"context"
-	"crypto/tls"
 	"net/http"
 
 	"github.com/samber/lo"
@@ -12,6 +11,7 @@ import (
 	ftypes "github.com/aquasecurity/trivy/pkg/fanal/types"
 	r "github.com/aquasecurity/trivy/pkg/rpc"
 	"github.com/aquasecurity/trivy/pkg/types"
+	xhttp "github.com/aquasecurity/trivy/pkg/x/http"
 	"github.com/aquasecurity/trivy/pkg/x/slices"
 	xstrings "github.com/aquasecurity/trivy/pkg/x/strings"
 	"github.com/aquasecurity/trivy/rpc/common"
@@ -47,15 +47,11 @@ type Service struct {
 
 // NewService is the factory method to return RPC Service
 func NewService(scannerOptions ServiceOption, opts ...Option) Service {
-	tr := http.DefaultTransport.(*http.Transport).Clone()
-	tr.TLSClientConfig = &tls.Config{InsecureSkipVerify: scannerOptions.Insecure}
-	httpClient := &http.Client{Transport: tr}
-
 	var twirpOpts []twirp.ClientOption
 	if scannerOptions.PathPrefix != "" {
 		twirpOpts = append(twirpOpts, twirp.WithClientPathPrefix(scannerOptions.PathPrefix))
 	}
-	c := rpc.NewScannerProtobufClient(scannerOptions.RemoteURL, httpClient, twirpOpts...)
+	c := rpc.NewScannerProtobufClient(scannerOptions.RemoteURL, xhttp.Client(), twirpOpts...)
 
 	o := &options{rpcClient: c}
 	for _, opt := range opts {

pkg/rpc/client/client_test.go

@@ -1,7 +1,6 @@
 package client
 
 import (
-	"crypto/tls"
 	"encoding/json"
 	"fmt"
 	"net/http"
@@ -18,6 +17,7 @@ import (
 	"github.com/aquasecurity/trivy-db/pkg/vulnsrc/vulnerability"
 	ftypes "github.com/aquasecurity/trivy/pkg/fanal/types"
 	"github.com/aquasecurity/trivy/pkg/types"
+	xhttp "github.com/aquasecurity/trivy/pkg/x/http"
 	"github.com/aquasecurity/trivy/rpc/common"
 	rpc "github.com/aquasecurity/trivy/rpc/scanner"
 )
@@ -236,11 +236,7 @@ func TestScanner_ScanServerInsecure(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			c := rpc.NewScannerProtobufClient(ts.URL, &http.Client{
-				Transport: &http.Transport{
-					TLSClientConfig: &tls.Config{
-						InsecureSkipVerify: tt.insecure,
-					},
-				},
+				Transport: xhttp.NewTransport(xhttp.Options{Insecure: tt.insecure}),
 			})
 			s := NewService(ServiceOption{Insecure: tt.insecure}, WithRPCClient(c))
 			_, err := s.Scan(t.Context(), "dummy", "", nil, types.ScanOptions{})

pkg/x/http/client.go

@@ -0,0 +1,30 @@
+package http
+
+import (
+	"context"
+	"net/http"
+	"time"
+)
+
+type ClientOption func(client *http.Client)
+
+func WithTimeout(timeout time.Duration) ClientOption {
+	return func(client *http.Client) {
+		client.Timeout = timeout
+	}
+}
+
+func Client(opts ...ClientOption) *http.Client {
+	return ClientWithContext(context.Background(), opts...)
+}
+
+// ClientWithContext returns an HTTP client with the specified context and options.
+func ClientWithContext(ctx context.Context, opts ...ClientOption) *http.Client {
+	c := &http.Client{
+		Transport: Transport(ctx),
+	}
+	for _, opt := range opts {
+		opt(c)
+	}
+	return c
+}

pkg/x/http/transport.go

@@ -0,0 +1,79 @@
+package http
+
+import (
+	"cmp"
+	"context"
+	"crypto/tls"
+	"fmt"
+	"net"
+	"net/http"
+	"sync"
+	"time"
+
+	"github.com/aquasecurity/trivy/pkg/version/app"
+)
+
+var (
+	defaultTransport = NewTransport(Options{})
+	mu               sync.RWMutex
+)
+
+type transportKey struct{}
+
+// WithTransport returns a new context with the given transport.
+// This is mainly for testing when a different HTTP transport needs to be used.
+func WithTransport(ctx context.Context, tr http.RoundTripper) context.Context {
+	return context.WithValue(ctx, transportKey{}, tr)
+}
+
+// Options configures the transport settings
+type Options struct {
+	Insecure  bool
+	Timeout   time.Duration
+	UserAgent string
+}
+
+// SetDefaultTransport sets the default transport configuration
+func SetDefaultTransport(tr http.RoundTripper) {
+	mu.Lock()
+	defer mu.Unlock()
+	defaultTransport = tr
+}
+
+// Transport returns the transport from the context, or the default transport if none is set.
+func Transport(ctx context.Context) http.RoundTripper {
+	t, ok := ctx.Value(transportKey{}).(http.RoundTripper)
+	if ok {
+		// If the transport is already set in the context, return it.
+		return t
+	}
+
+	mu.RLock()
+	defer mu.RUnlock()
+
+	return defaultTransport
+}
+
+// NewTransport creates a new HTTP transport with the specified options.
+// It should be used to initialize the default transport.
+// In most cases, you should use the `Transport` function to get the default transport.
+func NewTransport(opts Options) http.RoundTripper {
+	tr := http.DefaultTransport.(*http.Transport).Clone()
+
+	// Set timeout (default to 5 minutes)
+	timeout := cmp.Or(opts.Timeout, 5*time.Minute)
+	d := &net.Dialer{
+		Timeout: timeout,
+	}
+	tr.DialContext = d.DialContext
+
+	// Configure TLS
+	if opts.Insecure {
+		tr.TLSClientConfig = &tls.Config{
+			InsecureSkipVerify: opts.Insecure,
+		}
+	}
+
+	userAgent := cmp.Or(opts.UserAgent, fmt.Sprintf("trivy/%s", app.Version()))
+	return NewUserAgent(tr, userAgent)
+}

pkg/x/http/useragent.go

@@ -0,0 +1,28 @@
+package http
+
+import (
+	"net/http"
+)
+
+type userAgentTransport struct {
+	inner http.RoundTripper
+	ua    string
+}
+
+// NewUserAgent returns an http.Roundtripper that sets the user agent
+//
+// User-Agent: trivy/v0.64.0
+func NewUserAgent(inner http.RoundTripper, ua string) http.RoundTripper {
+	return &userAgentTransport{
+		inner: inner,
+		ua:    ua,
+	}
+}
+
+// RoundTrip implements http.RoundTripper
+func (ut *userAgentTransport) RoundTrip(in *http.Request) (*http.Response, error) {
+	if ut.ua != "" {
+		in.Header.Set("User-Agent", ut.ua)
+	}
+	return ut.inner.RoundTrip(in)
+}

pkg/x/http/useragent_test.go

@@ -0,0 +1,102 @@
+package http_test
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	xhttp "github.com/aquasecurity/trivy/pkg/x/http"
+)
+
+func TestUserAgentTransport_RoundTrip(t *testing.T) {
+	tests := []struct {
+		name            string
+		userAgent       string
+		existingHeaders map[string]string
+		existingUA      string
+		wantUA          string
+		wantHeaders     map[string]string
+	}{
+		{
+			name:      "default user agent",
+			userAgent: "",
+			wantUA:    "trivy/dev",
+		},
+		{
+			name:      "custom user agent",
+			userAgent: "custom-scanner/2.1",
+			wantUA:    "custom-scanner/2.1",
+		},
+		{
+			name:      "preserves existing headers",
+			userAgent: "test-agent/1.0",
+			existingHeaders: map[string]string{
+				"Authorization": "Bearer token123",
+				"Content-Type":  "application/json",
+			},
+			wantUA: "test-agent/1.0",
+			wantHeaders: map[string]string{
+				"Authorization": "Bearer token123",
+				"Content-Type":  "application/json",
+			},
+		},
+		{
+			name:       "overwrites existing user agent",
+			userAgent:  "new-agent/2.0",
+			existingUA: "old-agent/1.0",
+			wantUA:     "new-agent/2.0",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			// Create a test server
+			server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+				// Check User-Agent
+				gotUA := r.Header.Get("User-Agent")
+				assert.Equal(t, tt.wantUA, gotUA)
+
+				// Check other headers are preserved
+				for key, wantValue := range tt.wantHeaders {
+					gotValue := r.Header.Get(key)
+					assert.Equal(t, wantValue, gotValue, "header %s", key)
+				}
+
+				w.WriteHeader(http.StatusOK)
+			}))
+			defer server.Close()
+
+			// Create transport with user agent
+			transport := xhttp.NewTransport(xhttp.Options{
+				Insecure:  true,
+				UserAgent: tt.userAgent,
+			})
+
+			client := &http.Client{Transport: transport}
+
+			// Create request
+			req, err := http.NewRequest(http.MethodGet, server.URL, http.NoBody)
+			require.NoError(t, err)
+
+			// Set existing headers
+			for key, value := range tt.existingHeaders {
+				req.Header.Set(key, value)
+			}
+
+			// Set existing User-Agent if specified
+			if tt.existingUA != "" {
+				req.Header.Set("User-Agent", tt.existingUA)
+			}
+
+			// Make request
+			resp, err := client.Do(req)
+			require.NoError(t, err)
+			defer resp.Body.Close()
+
+			assert.Equal(t, http.StatusOK, resp.StatusCode)
+		})
+	}
+}