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lootUtils.go
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/
lootUtils.go
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package main
import (
"archive/tar"
"fmt"
"io"
"log"
"reflect"
"strings"
"sync"
"github.com/google/go-containerregistry/pkg/name"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/remote"
)
// processImage processes a single Docker image
func processImage(imageName string) error {
log.Println("Starting Scan for Image:", imageName)
var img v1.Image
var err error
ref, err := name.ParseReference(imageName)
if err != nil {
return fmt.Errorf("failed to parse image reference %s: %w", imageName, err)
}
// Try to get the remote image
img, err = remote.Image(ref)
if err != nil {
return fmt.Errorf("failed to retrieve remote image %s: %w", imageName, err)
}
// Create a WaitGroup to wait for goroutines to complete
var wg sync.WaitGroup
// Create an error channel to collect errors from goroutines
errorCh := make(chan error, 2)
// Run processLayers in a goroutine
wg.Add(1)
go func() {
defer wg.Done()
if err := processLayers(img, imageName); err != nil {
errorCh <- fmt.Errorf("error processing layers: %w", err)
return
}
}()
// Run processHistoryAndENV in a goroutine
wg.Add(1)
go func() {
defer wg.Done()
if err := processHistoryAndENV(img, imageName); err != nil {
errorCh <- fmt.Errorf("error scanning environment variables: %w", err)
return
}
}()
// Close the error channel once all goroutines are done
go func() {
wg.Wait()
close(errorCh)
}()
// Check for any errors from goroutines
for err := range errorCh {
return err
}
return nil
}
// Function to determine if a layer is compressed or uncompressed and to get the appropriate hash or diff ID
func getLayerInfo(layer v1.Layer) (v1.Hash, error) {
// Determine if the layer is compressed or uncompressed
isCompressed, err := isCompressedLayer(layer)
if err != nil {
return v1.Hash{}, err
}
// Get the appropriate identifier
if isCompressed {
digest, err := layer.Digest()
if err != nil {
return v1.Hash{}, err
}
return digest, nil
} else {
diffID, err := layer.DiffID()
if err != nil {
return v1.Hash{}, err
}
return diffID, nil
}
}
// Function to check if the layer is compressed or uncompressed
func isCompressedLayer(layer v1.Layer) (bool, error) {
// Use reflection to check if the layer is of the type that has the UncompressedLayer method
layerType := reflect.TypeOf(layer)
_, uncompressed := layerType.Elem().FieldByName("UncompressedLayer")
return !uncompressed, nil
}
// processLayers processes the layers of a Docker image
func processLayers(img v1.Image, imageName string) error {
var wg sync.WaitGroup
sem := make(chan struct{}, maxGoroutines) // Semaphore channel
layers, err := img.Layers()
if err != nil {
return fmt.Errorf("failed to get image layers: %w", err)
}
for _, layer := range layers {
key, err := getLayerInfo(layer)
if err != nil {
return fmt.Errorf("error getting layer Hash: %s", err)
}
sem <- struct{}{} // Acquire a token
wg.Add(1) // Increment the WaitGroup counter
go func(layer v1.Layer, key v1.Hash, imageName string) {
defer wg.Done() // Decrement the counter when the goroutine completes
defer func() { <-sem }() // Release the token
if err := processLayer(layer, key, imageName); err != nil {
log.Printf("error processing layer: %s", err)
}
}(layer, key, imageName)
}
wg.Wait() // Wait for all goroutines to finish
return nil
}
// processLayer reads and processes the content of a single image layer
func processLayer(layer v1.Layer, digest v1.Hash, imageName string) error {
log.Println("Scanning Layers:", digest.String())
// fileSemaphore := make(chan struct{}, 10)
r, err := layer.Uncompressed()
if err != nil {
return fmt.Errorf("failed to get uncompressed layer: %w", err)
}
defer r.Close()
gitSkip := false
tr := tar.NewReader(r)
for {
header, err := tr.Next()
if err == io.EOF {
break // End of tar archive
}
if err != nil {
return fmt.Errorf("error reading tar archive: %w", err)
}
if header.Typeflag != tar.TypeReg || isExcluded(header.Name) {
continue
}
// Handle specific file names directly
if handleSpecialFiles(header.Name) {
continue
}
if strings.Contains(header.Name, ".git/") && gitSkip {
continue
}
if strings.Contains(header.Name, ".git/HEAD") && scanMap["vuln"] {
gitSkip = true
handleGitRepo(header.Name)
continue
}
err = processFileContent(tr, header, digest, imageName)
if err != nil {
log.Printf("Error processing file %s: %s", header.Name, err)
}
}
return nil
}
func processFileContent(tr *tar.Reader, header *tar.Header, digest v1.Hash, imageName string) error {
if header.Size > maxFileSize {
// Handle large files by writing to a temp file
return processLargeFile(tr, header.Name, digest, imageName)
} else {
// Handle smaller files directly
return processSmallFile(tr, header.Name, digest, imageName)
}
}
// processHistory scans the history of a Docker image for potential secrets
func processHistoryAndENV(img v1.Image, imageName string) error {
config, err := img.ConfigFile()
if err != nil {
return fmt.Errorf("failed to get image config: %w", err)
}
for i, entry := range config.History {
if entry.CreatedBy != "" {
createdByContent := []byte(entry.CreatedBy)
queueTask(fmt.Sprintf("history:%d", i), &createdByContent, fmt.Sprintf("history:%d", i), imageName)
}
}
for _, envVar := range config.Config.Env {
envVarContent := []byte(envVar)
queueTask("ENV", &envVarContent, config.RootFS.DiffIDs[0], imageName)
}
return nil
}