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verify.go
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verify.go
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package hab
import (
"bufio"
"fmt"
"io"
"os"
"path"
"path/filepath"
"strings"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"golang.org/x/crypto/blake2b"
"github.com/chef/automate/components/automate-deployment/pkg/depot"
"github.com/chef/automate/components/automate-deployment/pkg/habpkg"
"github.com/chef/automate/lib/stringutils"
)
type VerifyErrChecksumMismatch struct {
pkg string
filename string
expectedChecksum string
calculatedChecksum string
}
type VerifyErrBadFileManifest struct {
pkg string
err error
}
type VerifyErrMissingFile struct {
pkg string
filename string
}
type VerifyErrExtraFile struct {
pkg string
filename string
}
func (v *VerifyErrMissingFile) Error() string {
return fmt.Sprintf("%s: missing file: %s", v.pkg, v.filename)
}
func (v *VerifyErrExtraFile) Error() string {
return fmt.Sprintf("%s: extra file: %s", v.pkg, v.filename)
}
func (v *VerifyErrBadFileManifest) Error() string {
return fmt.Sprintf("%s: bad FILES file: %s", v.pkg, v.err.Error())
}
func (v *VerifyErrChecksumMismatch) Error() string {
return fmt.Sprintf("%s: mismatched checksum: %s (expected=%s, calculated=%s)",
v.pkg, v.filename, v.expectedChecksum, v.calculatedChecksum)
}
type pkgFile struct {
filename string
checksum string
}
func loadFILESFile(pkg habpkg.HabPkg) (map[string]string, error) {
pkgPath := path.Join("/hab/pkgs", pkg.Origin(), pkg.Name(), pkg.Version(), pkg.Release())
pkgFILESPath := path.Join(pkgPath, "FILES")
f, err := os.Open(pkgFILESPath)
if err != nil {
if os.IsNotExist(err) && isKnownMissingFILES(pkgFILESPath) {
logrus.Debugf("%s is known to not exist. Skipping", pkgFILESPath)
return nil, nil
}
return nil, err
}
defer func() {
_ = f.Close()
}()
files := make(map[string]string)
bufReader := bufio.NewReader(f)
// Read the Header
for {
val, err := bufReader.ReadString('\n')
if err != nil {
return nil, errors.Wrapf(err, "failed to read %s", pkgPath)
}
if val == "\n" {
break
}
}
// Read the (checksum, file) pairs
for {
val, err := bufReader.ReadString('\n')
if err != nil {
if err == io.EOF {
if val == "" {
break
}
} else {
return nil, errors.Wrapf(err, "failed to read %s", pkgPath)
}
}
fields := strings.SplitAfterN(val, " ", 2)
if len(fields) != 2 {
return nil, errors.Errorf("invalid line %q for file %s", pkgPath, val)
}
files[strings.TrimSpace(fields[1])] = strings.TrimSpace(fields[0])
if err != nil {
break
}
}
if len(files) == 0 {
return nil, errors.Errorf("no files found in package %s", pkgPath)
}
return files, nil
}
func listFilesInPkg(pkg habpkg.HabPkg) ([]pkgFile, error) {
pkgFiles := []pkgFile{}
pkgPath := path.Join("/hab/pkgs", pkg.Origin(), pkg.Name(), pkg.Version(), pkg.Release())
err := filepath.Walk(pkgPath, func(filePath string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info.IsDir() {
return nil
}
if info.Mode()&os.ModeSymlink != 0 {
logrus.Debugf("%s is a symlink. Skipping", filePath)
return nil
}
relPath, err := filepath.Rel(pkgPath, filePath)
if err != nil {
return errors.Wrapf(err, "Could not get relative path for %s", filePath)
}
if path.Base(relPath) == "FILES" {
return nil
}
if path.Base(relPath) == "MANIFEST" {
return nil
}
f, err := os.Open(filePath)
if err != nil {
return errors.Wrapf(err, "failed to open file %s", filePath)
}
defer func() {
_ = f.Close()
}()
hasher, err := blake2b.New256(nil)
if err != nil {
return errors.Wrap(err, "failed to create hasher")
}
if _, err := io.Copy(hasher, f); err != nil {
return errors.Wrapf(err, "failed to checksum %s", filePath)
}
pkgFiles = append(pkgFiles, pkgFile{
filename: filePath,
checksum: fmt.Sprintf("%x", hasher.Sum(nil)),
})
return nil
})
if err != nil {
return nil, err
}
return pkgFiles, nil
}
var knownMissingFILES = []string{
"/hab/pkgs/core/libarchive/3.3.2/20171018164107/FILES",
}
func isKnownMissingFILES(filePath string) bool {
return stringutils.SliceContains(knownMissingFILES, filePath)
}
func VerifyHabPackages() error {
cache := depot.FromLocalCache()
pkgs, err := cache.ListAllPackages()
if err != nil {
return errors.Wrap(err, "failed to list packages")
}
errs := []error{}
for _, pkg := range pkgs {
expectedFiles, err := loadFILESFile(pkg)
if err != nil {
errs = append(errs, &VerifyErrBadFileManifest{
pkg: habpkg.Ident(&pkg),
err: err,
})
continue
}
if expectedFiles == nil {
continue
}
presentFiles, err := listFilesInPkg(pkg)
if err != nil {
return err
}
for name := range expectedFiles {
// Some versions of hab put MANIFEST in the
// FILES list and some do not. Because of
// this, listFilesInPkg filters them from
// present files, thus we skip it here too.
//
// See https://github.com/habitat-sh/habitat/issues/6746
//
if filepath.Base(name) == "MANIFEST" {
continue
}
found := false
for _, f := range presentFiles {
if f.filename == name {
found = true
break
}
}
if !found {
errs = append(errs, &VerifyErrMissingFile{
pkg: habpkg.Ident(&pkg),
filename: name,
})
}
}
for _, f := range presentFiles {
if expectedChecksum, ok := expectedFiles[f.filename]; ok {
if expectedChecksum != f.checksum {
errs = append(errs, &VerifyErrChecksumMismatch{
pkg: habpkg.Ident(&pkg),
filename: f.filename,
expectedChecksum: expectedChecksum,
calculatedChecksum: f.checksum,
})
}
} else {
errs = append(errs, &VerifyErrExtraFile{
pkg: habpkg.Ident(&pkg),
filename: f.filename,
})
}
}
}
if len(errs) == 0 {
return nil
}
for _, err := range errs {
fmt.Println(err.Error())
}
return errors.New("Failed to verify installed packages")
}