152 lines
3.5 KiB
Go
152 lines
3.5 KiB
Go
package oval
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"time"
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"github.com/cenkalti/backoff"
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"github.com/future-architect/vuls/config"
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"github.com/future-architect/vuls/models"
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"github.com/future-architect/vuls/util"
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ver "github.com/knqyf263/go-deb-version"
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ovalmodels "github.com/kotakanbe/goval-dictionary/models"
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"github.com/parnurzeal/gorequest"
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)
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// Client is the interface of OVAL client.
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type Client interface {
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FillWithOval(r *models.ScanResult) error
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}
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type request struct {
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pack models.Package
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}
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type response struct {
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pack *models.Package
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defs []ovalmodels.Definition
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}
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// getDefsByPackNameViaHTTP fetches OVAL information via HTTP
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func getDefsByPackNameViaHTTP(r *models.ScanResult) (
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relatedDefs []ovalmodels.Definition, err error) {
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//TODO Health Check
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reqChan := make(chan request, len(r.Packages))
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resChan := make(chan response, len(r.Packages))
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errChan := make(chan error, len(r.Packages))
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defer close(reqChan)
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defer close(resChan)
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defer close(errChan)
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go func() {
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for _, pack := range r.Packages {
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reqChan <- request{
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pack: pack,
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}
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}
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}()
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concurrency := 10
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tasks := util.GenWorkers(concurrency)
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for range r.Packages {
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tasks <- func() {
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select {
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case req := <-reqChan:
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url, err := util.URLPathJoin(
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config.Conf.OvalDBURL,
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"packs",
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r.Family,
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r.Release,
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req.pack.Name,
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)
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if err != nil {
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errChan <- err
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} else {
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util.Log.Debugf("HTTP Request to %s", url)
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httpGet(url, &req.pack, resChan, errChan)
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}
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}
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}
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}
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timeout := time.After(2 * 60 * time.Second)
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var errs []error
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for range r.Packages {
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select {
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case res := <-resChan:
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current, _ := ver.NewVersion(fmt.Sprintf("%s-%s",
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res.pack.Version, res.pack.Release))
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for _, def := range res.defs {
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for _, p := range def.AffectedPacks {
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affected, _ := ver.NewVersion(p.Version)
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if res.pack.Name != p.Name || !current.LessThan(affected) {
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continue
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}
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relatedDefs = append(relatedDefs, def)
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}
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}
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case err := <-errChan:
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errs = append(errs, err)
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case <-timeout:
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return nil, fmt.Errorf("Timeout Fetching OVAL")
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}
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}
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if len(errs) != 0 {
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return nil, fmt.Errorf("Failed to fetch OVAL. err: %v", errs)
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}
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return
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}
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func httpGet(url string, pack *models.Package, resChan chan<- response, errChan chan<- error) {
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var body string
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var errs []error
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var resp *http.Response
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count, retryMax := 0, 3
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f := func() (err error) {
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// resp, body, errs = gorequest.New().SetDebug(config.Conf.Debug).Get(url).End()
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resp, body, errs = gorequest.New().Get(url).End()
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if 0 < len(errs) || resp == nil || resp.StatusCode != 200 {
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count++
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if count == retryMax {
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return nil
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}
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return fmt.Errorf("HTTP GET error: %v, url: %s, resp: %v",
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errs, url, resp)
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}
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return nil
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}
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notify := func(err error, t time.Duration) {
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util.Log.Warnf("Failed to HTTP GET. retrying in %s seconds. err: %s", t, err)
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}
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err := backoff.RetryNotify(f, backoff.NewExponentialBackOff(), notify)
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if err != nil {
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errChan <- fmt.Errorf("HTTP Error %s", err)
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return
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}
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if count == retryMax {
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errChan <- fmt.Errorf("HRetry count exceeded")
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return
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}
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defs := []ovalmodels.Definition{}
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if err := json.Unmarshal([]byte(body), &defs); err != nil {
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errChan <- fmt.Errorf("Failed to Unmarshall. body: %s, err: %s",
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body, err)
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return
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}
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resChan <- response{
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pack: pack,
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defs: defs,
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}
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}
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func getPackages(r *models.ScanResult, d *ovalmodels.Definition) (names []string) {
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for _, affectedPack := range d.AffectedPacks {
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names = append(names, affectedPack.Name)
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}
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return
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}
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