/
wsusscn2.go
306 lines (263 loc) · 8.8 KB
/
wsusscn2.go
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package wsusscn2
import (
"context"
"encoding/xml"
"io"
"log"
"net/http"
"os"
"os/exec"
"path/filepath"
"strconv"
"strings"
pb "github.com/cheggaaa/pb/v3"
"github.com/pkg/errors"
"golang.org/x/exp/maps"
"golang.org/x/exp/slices"
"golang.org/x/sync/errgroup"
"golang.org/x/sync/semaphore"
"github.com/vulsio/windows-vuln-feed/pkg/supercedence/model"
)
var (
wsusscnURL = "http://download.windowsupdate.com/microsoftupdate/v6/wsusscan/wsusscn2.cab"
concurrency = 2
)
// FetchandParse ...
func FetchandParse() ([]model.Supercedence, error) {
log.Printf("INFO: fetch wsusscn2.cab by %s", wsusscnURL)
cabDir, err := fetchWSUSSCN()
if err != nil {
return nil, errors.Wrap(err, "failed to fetch wsusscn2.cab")
}
supercedences, err := Parse(cabDir)
if err != nil {
return nil, errors.Wrap(err, "failed to parse wsusscn2.cab")
}
if err := os.RemoveAll(cabDir); err != nil {
return nil, errors.Wrapf(err, "failed to remove %s", cabDir)
}
log.Printf("INFO: %d Supercedences found", len(supercedences))
return supercedences, nil
}
func fetchWSUSSCN() (string, error) {
dir, err := os.MkdirTemp("", "windows-vuln-feed")
if err != nil {
return "", errors.Wrap(err, "failed to make directory")
}
req, err := http.NewRequest(http.MethodGet, wsusscnURL, nil)
if err != nil {
return "", errors.Wrap(err, "failed to build request")
}
client := new(http.Client)
resp, err := client.Do(req)
if err != nil {
return "", errors.Wrap(err, "failed to do request")
}
defer resp.Body.Close()
f, err := os.Create(filepath.Join(dir, "wsusscn2.cab"))
if err != nil {
return "", errors.Wrap(err, "failed to create wsusscn2.cab")
}
defer f.Close()
if _, err := io.Copy(f, resp.Body); err != nil {
return "", errors.Wrap(err, "failed to copy to wsusscn2.cab from response body")
}
if err := extractWSUSSCN(dir); err != nil {
return "", errors.Wrap(err, "failed to extract wsusscn2.cab")
}
return filepath.Join(dir, "wsusscn2"), nil
}
func extractWSUSSCN(tmpDir string) error {
binPath, err := exec.LookPath("cabextract")
if err != nil {
return errors.Wrap(err, "failed to look cabextract path")
}
log.Printf("INFO: extract %s", filepath.Join(tmpDir, "wsusscn2.cab"))
if err := exec.Command(binPath, "-d", filepath.Join(tmpDir, "wsusscn2"), filepath.Join(tmpDir, "wsusscn2.cab")).Run(); err != nil {
return errors.Wrap(err, "failed to run cabextract wsusscn2.cab")
}
if err := os.Remove(filepath.Join(tmpDir, "wsusscn2.cab")); err != nil {
return errors.Wrap(err, "failed to remove wsusscn2.cab")
}
f, err := os.Open(filepath.Join(tmpDir, "wsusscn2", "index.xml"))
if err != nil {
return errors.Wrap(err, "failed to open wsusscn2/index.xml")
}
defer f.Close()
var cabIndex index
if err := xml.NewDecoder(f).Decode(&cabIndex); err != nil {
return errors.Wrap(err, "failed to decode xml")
}
log.Printf("INFO: extract %s", filepath.Join(tmpDir, "wsusscn2", "package.cab"))
if err := exec.Command(binPath, "-d", filepath.Join(tmpDir, "wsusscn2", "package"), filepath.Join(tmpDir, "wsusscn2", "package.cab")).Run(); err != nil {
return errors.Wrap(err, "failed to run cabextract wsusscn2/package.cab")
}
if err := os.Remove(filepath.Join(tmpDir, "wsusscn2", "package.cab")); err != nil {
return errors.Wrap(err, "failed to remove wsusscn2/package.cab")
}
log.Printf("INFO: extract %s", filepath.Join(tmpDir, "wsusscn2", "package\\d{1,2}.cab"))
bar := pb.StartNew(len(cabIndex.CABLIST.CAB) - 1)
eg, ctx := errgroup.WithContext(context.Background())
sem := semaphore.NewWeighted(int64(concurrency))
for _, c := range cabIndex.CABLIST.CAB {
c := c
eg.Go(func() error {
if err := sem.Acquire(ctx, 1); err != nil {
return errors.Wrap(err, "failed to acquire semaphore")
}
defer sem.Release(1)
if c.NAME == "package.cab" {
return nil
}
if err := exec.Command(binPath, "-d", filepath.Join(tmpDir, "wsusscn2", strings.TrimSuffix(c.NAME, ".cab")), filepath.Join(tmpDir, "wsusscn2", c.NAME)).Run(); err != nil {
return errors.Wrapf(err, "failed to cabextract wsusscn2/%s", c.NAME)
}
if err := os.Remove(filepath.Join(tmpDir, "wsusscn2", c.NAME)); err != nil {
return errors.Wrapf(err, "failed to remove wsusscn2/%s", c.NAME)
}
dirs, err := os.ReadDir(filepath.Join(tmpDir, "wsusscn2", strings.TrimSuffix(c.NAME, ".cab")))
if err != nil {
return errors.Wrapf(err, "failed to read wsusscn2/%s", strings.TrimSuffix(c.NAME, ".cab"))
}
for _, dir := range dirs {
if filepath.Base(dir.Name()) == "x" {
continue
}
if err := os.RemoveAll(filepath.Join(tmpDir, "wsusscn2", strings.TrimSuffix(c.NAME, ".cab"), dir.Name())); err != nil {
return errors.Wrapf(err, "failed to remove wsusscn2/%s/%s", strings.TrimSuffix(c.NAME, ".cab"), dir.Name())
}
}
bar.Increment()
return nil
})
}
if err := eg.Wait(); err != nil {
return errors.Wrapf(err, "failed to extract %s", filepath.Join(tmpDir, "wsusscn2", "package\\d{1,2}.cab"))
}
bar.Finish()
return nil
}
// Parse ...
func Parse(cabDir string) ([]model.Supercedence, error) {
rIDtoUID, supersededbyRID, err := walkPackage(filepath.Join(cabDir, "package", "package.xml"))
if err != nil {
return nil, errors.Wrap(err, "failed to walk wsusscn2/package/package.xml")
}
rIDtoKBID, err := walkXDirs(cabDir, maps.Keys(rIDtoUID))
if err != nil {
return nil, errors.Wrap(err, "failed to walk wsusscn2/package\\d{1,2}/x/<Revision ID>")
}
rivisions := []model.Supercedence{}
for rid, supersededby := range supersededbyRID {
r := model.Supercedence{
UpdateID: rid,
Supersededby: &model.Supersededby{
UpdateIDs: []string{},
},
}
r.Supersededby.UpdateIDs = append(r.Supersededby.UpdateIDs, supersededby...)
rivisions = append(rivisions, r)
}
supercedences := []model.Supercedence{}
for _, r := range rivisions {
s := model.Supercedence{
KBID: rIDtoKBID[r.UpdateID],
UpdateID: rIDtoUID[r.UpdateID],
Supersededby: &model.Supersededby{
KBIDs: []string{},
UpdateIDs: []string{},
},
}
for _, ruid := range r.Supersededby.UpdateIDs {
if _, ok := rIDtoKBID[ruid]; ok {
s.Supersededby.KBIDs = append(s.Supersededby.KBIDs, rIDtoKBID[ruid])
}
if _, ok := rIDtoUID[ruid]; ok {
s.Supersededby.UpdateIDs = append(s.Supersededby.UpdateIDs, rIDtoUID[ruid])
}
}
supercedences = append(supercedences, s)
}
return supercedences, nil
}
func walkPackage(packagePath string) (map[string]string, map[string][]string, error) {
f, err := os.Open(packagePath)
if err != nil {
return nil, nil, errors.Wrap(err, "failed to open package.xml")
}
defer f.Close()
var packages offlineSyncPackage
if err := xml.NewDecoder(f).Decode(&packages); err != nil {
return nil, nil, errors.Wrap(err, "failed to decode package.xml")
}
rIDtoUID := map[string]string{}
supersededbyRID := map[string][]string{}
for _, u := range packages.Updates.Update {
if u.IsBundle != "true" || u.IsSoftware == "false" {
continue
}
rIDtoUID[u.RevisionID] = u.UpdateID
for _, sr := range u.SupersededBy.Revision {
supersededbyRID[u.RevisionID] = append(supersededbyRID[u.RevisionID], sr.ID)
}
}
return rIDtoUID, supersededbyRID, nil
}
func walkXDirs(cabDir string, rids []string) (map[string]string, error) {
f, err := os.Open(filepath.Join(cabDir, "index.xml"))
if err != nil {
return nil, errors.Wrap(err, "failed to open wsusscn2/index.xml")
}
defer f.Close()
var cabIndex index
if err := xml.NewDecoder(f).Decode(&cabIndex); err != nil {
return nil, errors.Wrap(err, "failed to decode xml")
}
cabs := []cab{}
for _, c := range cabIndex.CABLIST.CAB {
if c.RANGESTART == "" {
continue
}
cabs = append(cabs, c)
}
slices.SortFunc(cabs, func(i, j cab) bool {
iint, _ := strconv.ParseInt(i.RANGESTART, 10, 32)
jint, _ := strconv.ParseInt(j.RANGESTART, 10, 32)
return iint > jint
})
rIDtoKBID := map[string]string{}
for _, rid := range rids {
kbid, err := getKBID(rid, cabDir, cabs)
if err != nil {
return nil, errors.Wrap(err, "failed to get KBID")
}
rIDtoKBID[rid] = kbid
}
return rIDtoKBID, nil
}
func getKBID(rid, cabDir string, cabs []cab) (string, error) {
ridint, err := strconv.ParseUint(rid, 10, 32)
if err != nil {
return "", errors.Wrap(err, "failed to parse uint")
}
for _, c := range cabs {
cabint, err := strconv.ParseUint(c.RANGESTART, 10, 32)
if err != nil {
return "", errors.Wrap(err, "failed to parse uint")
}
if ridint < cabint {
continue
}
f, err := os.Open(filepath.Join(cabDir, strings.TrimSuffix(c.NAME, ".cab"), "x", rid))
if err != nil {
return "", errors.Wrapf(err, "failed to open wsusscn2/%s/x/%s", strings.TrimSuffix(c.NAME, ".cab"), rid)
}
defer f.Close()
var xKBID xKBID
if err := xml.NewDecoder(f).Decode(&xKBID); err != nil {
return "", errors.Wrap(err, "failed to decode xml")
}
return xKBID.KBArticleID, nil
}
return "", errors.Errorf("failed to find cab directory for revision id %s", rid)
}