1
0
mirror of https://github.com/SAP/jenkins-library.git synced 2024-12-12 10:55:20 +02:00
sap-jenkins-library/cmd/checkmarxExecuteScan.go

612 lines
23 KiB
Go

package cmd
import (
"archive/zip"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"regexp"
"sort"
"strconv"
"strings"
"time"
"encoding/xml"
"github.com/SAP/jenkins-library/pkg/checkmarx"
piperHttp "github.com/SAP/jenkins-library/pkg/http"
"github.com/SAP/jenkins-library/pkg/log"
"github.com/SAP/jenkins-library/pkg/piperutils"
"github.com/SAP/jenkins-library/pkg/telemetry"
"github.com/bmatcuk/doublestar"
)
func checkmarxExecuteScan(config checkmarxExecuteScanOptions, telemetryData *telemetry.CustomData, influx *checkmarxExecuteScanInflux) error {
client := &piperHttp.Client{}
sys, err := checkmarx.NewSystemInstance(client, config.ServerURL, config.Username, config.Password)
if err != nil {
log.Entry().WithError(err).Fatalf("Failed to create Checkmarx client talking to URL %v", config.ServerURL)
}
runScan(config, sys, "./", influx)
return nil
}
func runScan(config checkmarxExecuteScanOptions, sys checkmarx.System, workspace string, influx *checkmarxExecuteScanInflux) {
team := loadTeam(sys, config.TeamName, config.TeamID)
project, projectName := loadExistingProject(sys, config.ProjectName, config.PullRequestName, team.ID)
if project.Name == projectName {
log.Entry().Infof("Project %v exists...", projectName)
if len(config.Preset) > 0 {
setPresetForProject(sys, project.ID, projectName, config.Preset, config.SourceEncoding)
}
} else {
log.Entry().Infof("Project %v does not exist, starting to create it...", projectName)
project = createAndConfigureNewProject(sys, projectName, team.ID, config.Preset, config.SourceEncoding)
}
uploadAndScan(config, sys, project, workspace, influx)
}
func loadTeam(sys checkmarx.System, teamName, teamID string) checkmarx.Team {
teams := sys.GetTeams()
team := checkmarx.Team{}
if len(teams) > 0 {
if len(teamName) > 0 {
team = sys.FilterTeamByName(teams, teamName)
} else {
team = sys.FilterTeamByID(teams, teamID)
}
}
if len(team.ID) == 0 {
log.Entry().Fatalf("Failed to identify team by teamName %v as well as by checkmarxGroupId %v", teamName, teamID)
}
return team
}
func loadExistingProject(sys checkmarx.System, initialProjectName, pullRequestName, teamID string) (checkmarx.Project, string) {
var project checkmarx.Project
projectName := initialProjectName
if len(pullRequestName) > 0 {
projectName = fmt.Sprintf("%v_%v", initialProjectName, pullRequestName)
projects := sys.GetProjectsByNameAndTeam(projectName, teamID)
if len(projects) == 0 {
projects = sys.GetProjectsByNameAndTeam(initialProjectName, teamID)
if len(projects) > 0 {
ok, branchProject := sys.GetProjectByID(sys.CreateBranch(projects[0].ID, projectName))
if !ok {
log.Entry().Fatalf("Failed to create branch %v for project %v", projectName, initialProjectName)
}
project = branchProject
}
} else {
project = projects[0]
log.Entry().Debugf("Loaded project with name %v", project.Name)
}
} else {
projects := sys.GetProjectsByNameAndTeam(projectName, teamID)
if len(projects) > 0 {
project = projects[0]
log.Entry().Debugf("Loaded project with name %v", project.Name)
}
}
return project, projectName
}
func zipWorkspaceFiles(workspace, filterPattern string) *os.File {
zipFileName := filepath.Join(workspace, "workspace.zip")
patterns := strings.Split(strings.ReplaceAll(strings.ReplaceAll(filterPattern, ", ", ","), " ,", ","), ",")
sort.Strings(patterns)
zipFile, err := os.Create(zipFileName)
if err != nil {
log.Entry().WithError(err).Fatal("Failed to create archive of project sources")
}
defer zipFile.Close()
zipFolder(workspace, zipFile, patterns)
return zipFile
}
func uploadAndScan(config checkmarxExecuteScanOptions, sys checkmarx.System, project checkmarx.Project, workspace string, influx *checkmarxExecuteScanInflux) {
ok, previousScans := sys.GetScans(project.ID)
if !ok && config.VerifyOnly {
log.Entry().Warnf("Cannot load scans for project %v, verification only mode aborted", project.Name)
}
if len(previousScans) > 0 && config.VerifyOnly {
verifyCxProjectCompliance(config, sys, previousScans[0].ID, workspace, influx)
} else {
zipFile := zipWorkspaceFiles(workspace, config.FilterPattern)
sourceCodeUploaded := sys.UploadProjectSourceCode(project.ID, zipFile.Name())
if sourceCodeUploaded {
log.Entry().Debugf("Source code uploaded for project %v", project.Name)
err := os.Remove(zipFile.Name())
if err != nil {
log.Entry().WithError(err).Warnf("Failed to delete zipped source code for project %v", project.Name)
}
incremental := config.Incremental
fullScanCycle, err := strconv.Atoi(config.FullScanCycle)
if err != nil {
log.Entry().WithError(err).Fatalf("Invalid configuration value for fullScanCycle %v, must be a positive int", config.FullScanCycle)
}
if incremental && config.FullScansScheduled && fullScanCycle > 0 && (getNumCoherentIncrementalScans(sys, previousScans)+1)%fullScanCycle == 0 {
incremental = false
}
triggerScan(config, sys, project, workspace, incremental, influx)
} else {
log.Entry().Fatalf("Cannot upload source code for project %v", project.Name)
}
}
}
func triggerScan(config checkmarxExecuteScanOptions, sys checkmarx.System, project checkmarx.Project, workspace string, incremental bool, influx *checkmarxExecuteScanInflux) {
projectIsScanning, scan := sys.ScanProject(project.ID, incremental, true, !config.AvoidDuplicateProjectScans)
if projectIsScanning {
log.Entry().Debugf("Scanning project %v ", project.Name)
pollScanStatus(sys, scan)
log.Entry().Debugln("Scan finished")
verifyCxProjectCompliance(config, sys, scan.ID, workspace, influx)
} else {
log.Entry().Fatalf("Cannot scan project %v", project.Name)
}
}
func verifyCxProjectCompliance(config checkmarxExecuteScanOptions, sys checkmarx.System, scanID int, workspace string, influx *checkmarxExecuteScanInflux) {
var reports []piperutils.Path
if config.GeneratePdfReport {
pdfReportName := createReportName(workspace, "CxSASTReport_%v.pdf")
ok := downloadAndSaveReport(sys, pdfReportName, scanID)
if ok {
reports = append(reports, piperutils.Path{Target: pdfReportName, Mandatory: true})
}
} else {
log.Entry().Debug("Report generation is disabled via configuration")
}
xmlReportName := createReportName(workspace, "CxSASTResults_%v.xml")
results := getDetailedResults(sys, xmlReportName, scanID)
reports = append(reports, piperutils.Path{Target: xmlReportName})
links := []piperutils.Path{piperutils.Path{Target: results["DeepLink"].(string), Name: "Checkmarx Web UI"}}
piperutils.PersistReportsAndLinks("checkmarxExecuteScan", workspace, reports, links)
reportToInflux(results, influx)
insecure := false
if config.VulnerabilityThresholdEnabled {
insecure = enforceThresholds(config, results)
}
if insecure {
if config.VulnerabilityThresholdResult == "FAILURE" {
log.Entry().Fatalln("Checkmarx scan failed, the project is not compliant. For details see the archived report.")
}
log.Entry().Errorf("Checkmarx scan result set to %v, some results are not meeting defined thresholds. For details see the archived report.", config.VulnerabilityThresholdResult)
} else {
log.Entry().Infoln("Checkmarx scan finished")
}
}
func createReportName(workspace, reportFileNameTemplate string) string {
regExpFileName := regexp.MustCompile(`[^\w\d]`)
timeStamp, _ := time.Now().Local().MarshalText()
return filepath.Join(workspace, fmt.Sprintf(reportFileNameTemplate, regExpFileName.ReplaceAllString(string(timeStamp), "_")))
}
func pollScanStatus(sys checkmarx.System, scan checkmarx.Scan) {
status := "Scan phase: New"
pastStatus := status
log.Entry().Info(status)
for true {
stepDetail := "..."
stageDetail := "..."
var detail checkmarx.ScanStatusDetail
status, detail = sys.GetScanStatusAndDetail(scan.ID)
if status == "Finished" || status == "Canceled" || status == "Failed" {
break
}
if len(detail.Stage) > 0 {
stageDetail = detail.Stage
}
if len(detail.Step) > 0 {
stepDetail = detail.Step
}
status = fmt.Sprintf("Scan phase: %v (%v / %v)", status, stageDetail, stepDetail)
if pastStatus != status {
log.Entry().Info(status)
pastStatus = status
}
log.Entry().Debug("Polling for status: sleeping...")
time.Sleep(10 * time.Second)
}
if status == "Canceled" {
log.Entry().Fatalln("Scan canceled via web interface")
}
if status == "Failed" {
log.Entry().Fatalln("Scan failed, please check the Checkmarx UI for details")
}
}
func reportToInflux(results map[string]interface{}, influx *checkmarxExecuteScanInflux) {
influx.checkmarx_data.fields.high_issues = strconv.Itoa(results["High"].(map[string]int)["Issues"])
influx.checkmarx_data.fields.high_not_false_postive = strconv.Itoa(results["High"].(map[string]int)["NotFalsePositive"])
influx.checkmarx_data.fields.high_not_exploitable = strconv.Itoa(results["High"].(map[string]int)["NotExploitable"])
influx.checkmarx_data.fields.high_confirmed = strconv.Itoa(results["High"].(map[string]int)["Confirmed"])
influx.checkmarx_data.fields.high_urgent = strconv.Itoa(results["High"].(map[string]int)["Urgent"])
influx.checkmarx_data.fields.high_proposed_not_exploitable = strconv.Itoa(results["High"].(map[string]int)["ProposedNotExploitable"])
influx.checkmarx_data.fields.high_to_verify = strconv.Itoa(results["High"].(map[string]int)["ToVerify"])
influx.checkmarx_data.fields.medium_issues = strconv.Itoa(results["Medium"].(map[string]int)["Issues"])
influx.checkmarx_data.fields.medium_not_false_postive = strconv.Itoa(results["Medium"].(map[string]int)["NotFalsePositive"])
influx.checkmarx_data.fields.medium_not_exploitable = strconv.Itoa(results["Medium"].(map[string]int)["NotExploitable"])
influx.checkmarx_data.fields.medium_confirmed = strconv.Itoa(results["Medium"].(map[string]int)["Confirmed"])
influx.checkmarx_data.fields.medium_urgent = strconv.Itoa(results["Medium"].(map[string]int)["Urgent"])
influx.checkmarx_data.fields.medium_proposed_not_exploitable = strconv.Itoa(results["Medium"].(map[string]int)["ProposedNotExploitable"])
influx.checkmarx_data.fields.medium_to_verify = strconv.Itoa(results["Medium"].(map[string]int)["ToVerify"])
influx.checkmarx_data.fields.low_issues = strconv.Itoa(results["Low"].(map[string]int)["Issues"])
influx.checkmarx_data.fields.low_not_false_postive = strconv.Itoa(results["Low"].(map[string]int)["NotFalsePositive"])
influx.checkmarx_data.fields.low_not_exploitable = strconv.Itoa(results["Low"].(map[string]int)["NotExploitable"])
influx.checkmarx_data.fields.low_confirmed = strconv.Itoa(results["Low"].(map[string]int)["Confirmed"])
influx.checkmarx_data.fields.low_urgent = strconv.Itoa(results["Low"].(map[string]int)["Urgent"])
influx.checkmarx_data.fields.low_proposed_not_exploitable = strconv.Itoa(results["Low"].(map[string]int)["ProposedNotExploitable"])
influx.checkmarx_data.fields.low_to_verify = strconv.Itoa(results["Low"].(map[string]int)["ToVerify"])
influx.checkmarx_data.fields.information_issues = strconv.Itoa(results["Information"].(map[string]int)["Issues"])
influx.checkmarx_data.fields.information_not_false_postive = strconv.Itoa(results["Information"].(map[string]int)["NotFalsePositive"])
influx.checkmarx_data.fields.information_not_exploitable = strconv.Itoa(results["Information"].(map[string]int)["NotExploitable"])
influx.checkmarx_data.fields.information_confirmed = strconv.Itoa(results["Information"].(map[string]int)["Confirmed"])
influx.checkmarx_data.fields.information_urgent = strconv.Itoa(results["Information"].(map[string]int)["Urgent"])
influx.checkmarx_data.fields.information_proposed_not_exploitable = strconv.Itoa(results["Information"].(map[string]int)["ProposedNotExploitable"])
influx.checkmarx_data.fields.information_to_verify = strconv.Itoa(results["Information"].(map[string]int)["ToVerify"])
influx.checkmarx_data.fields.initiator_name = results["InitiatorName"].(string)
influx.checkmarx_data.fields.owner = results["Owner"].(string)
influx.checkmarx_data.fields.scan_id = results["ScanId"].(string)
influx.checkmarx_data.fields.project_id = results["ProjectId"].(string)
influx.checkmarx_data.fields.project_name = results["ProjectName"].(string)
influx.checkmarx_data.fields.team = results["Team"].(string)
influx.checkmarx_data.fields.team_full_path_on_report_date = results["TeamFullPathOnReportDate"].(string)
influx.checkmarx_data.fields.scan_start = results["ScanStart"].(string)
influx.checkmarx_data.fields.scan_time = results["ScanTime"].(string)
influx.checkmarx_data.fields.lines_of_code_scanned = results["LinesOfCodeScanned"].(string)
influx.checkmarx_data.fields.files_scanned = results["FilesScanned"].(string)
influx.checkmarx_data.fields.checkmarx_version = results["CheckmarxVersion"].(string)
influx.checkmarx_data.fields.scan_type = results["ScanType"].(string)
influx.checkmarx_data.fields.preset = results["Preset"].(string)
influx.checkmarx_data.fields.deep_link = results["DeepLink"].(string)
influx.checkmarx_data.fields.report_creation_time = results["ReportCreationTime"].(string)
}
func downloadAndSaveReport(sys checkmarx.System, reportFileName string, scanID int) bool {
ok, report := generateAndDownloadReport(sys, scanID, "PDF")
if ok {
log.Entry().Debugf("Saving report to file %v...", reportFileName)
ioutil.WriteFile(reportFileName, report, 0700)
return true
}
log.Entry().Debugf("Failed to fetch report %v from backend...", reportFileName)
return false
}
func enforceThresholds(config checkmarxExecuteScanOptions, results map[string]interface{}) bool {
insecure := false
cxHighThreshold := config.VulnerabilityThresholdHigh
cxMediumThreshold := config.VulnerabilityThresholdMedium
cxLowThreshold := config.VulnerabilityThresholdLow
highValue := results["High"].(map[string]int)["NotFalsePositive"]
mediumValue := results["Medium"].(map[string]int)["NotFalsePositive"]
lowValue := results["Low"].(map[string]int)["NotFalsePositive"]
var unit string
highViolation := ""
mediumViolation := ""
lowViolation := ""
if config.VulnerabilityThresholdUnit == "percentage" {
unit = "%"
highAudited := results["High"].(map[string]int)["Issues"] - results["High"].(map[string]int)["NotFalsePositive"]
highOverall := results["High"].(map[string]int)["Issues"]
if highOverall == 0 {
highAudited = 1
highOverall = 1
}
mediumAudited := results["Medium"].(map[string]int)["Issues"] - results["Medium"].(map[string]int)["NotFalsePositive"]
mediumOverall := results["Medium"].(map[string]int)["Issues"]
if mediumOverall == 0 {
mediumAudited = 1
mediumOverall = 1
}
lowAudited := results["Low"].(map[string]int)["Confirmed"] + results["Low"].(map[string]int)["NotExploitable"]
lowOverall := results["Low"].(map[string]int)["Issues"]
if lowOverall == 0 {
lowAudited = 1
lowOverall = 1
}
highValue = int(float32(highAudited) / float32(highOverall) * 100.0)
mediumValue = int(float32(mediumAudited) / float32(mediumOverall) * 100.0)
lowValue = int(float32(lowAudited) / float32(lowOverall) * 100.0)
if highValue < cxHighThreshold {
insecure = true
highViolation = fmt.Sprintf("<-- %v %v deviation", cxHighThreshold-highValue, unit)
}
if mediumValue < cxMediumThreshold {
insecure = true
mediumViolation = fmt.Sprintf("<-- %v %v deviation", cxMediumThreshold-mediumValue, unit)
}
if lowValue < cxLowThreshold {
insecure = true
lowViolation = fmt.Sprintf("<-- %v %v deviation", cxLowThreshold-lowValue, unit)
}
}
if config.VulnerabilityThresholdUnit == "absolute" {
unit = " findings"
if highValue > cxHighThreshold {
insecure = true
highViolation = fmt.Sprintf("<-- %v%v deviation", highValue-cxHighThreshold, unit)
}
if mediumValue > cxMediumThreshold {
insecure = true
mediumViolation = fmt.Sprintf("<-- %v%v deviation", mediumValue-cxMediumThreshold, unit)
}
if lowValue > cxLowThreshold {
insecure = true
lowViolation = fmt.Sprintf("<-- %v%v deviation", lowValue-cxLowThreshold, unit)
}
}
log.Entry().Infoln("")
log.Entry().Infof("High %v%v %v", highValue, unit, highViolation)
log.Entry().Infof("Medium %v%v %v", mediumValue, unit, mediumViolation)
log.Entry().Infof("Low %v%v %v", lowValue, unit, lowViolation)
log.Entry().Infoln("")
return insecure
}
func createAndConfigureNewProject(sys checkmarx.System, projectName, teamID, presetValue, engineConfiguration string) checkmarx.Project {
ok, projectCreateResult := sys.CreateProject(projectName, teamID)
if ok {
if len(presetValue) > 0 {
setPresetForProject(sys, projectCreateResult.ID, projectName, presetValue, engineConfiguration)
} else {
log.Entry().Fatalf("Preset not specified, creation of project %v failed", projectName)
}
projects := sys.GetProjectsByNameAndTeam(projectName, teamID)
if len(projects) > 0 {
log.Entry().Debugf("New Project %v created", projectName)
return projects[0]
}
log.Entry().Fatalf("Failed to load newly created project %v", projectName)
}
log.Entry().Fatalf("Cannot create project %v", projectName)
return checkmarx.Project{}
}
// loadPreset finds a checkmarx.Preset that has either the ID or Name given by presetValue.
// presetValue is not expected to be empty.
func loadPreset(sys checkmarx.System, presetValue string) (bool, checkmarx.Preset) {
presets := sys.GetPresets()
var preset checkmarx.Preset
presetID, err := strconv.Atoi(presetValue)
var configuredPresetID int
var configuredPresetName string
if err != nil {
preset = sys.FilterPresetByName(presets, presetValue)
configuredPresetName = presetValue
} else {
preset = sys.FilterPresetByID(presets, presetID)
configuredPresetID = presetID
}
if configuredPresetID > 0 && preset.ID == configuredPresetID || len(configuredPresetName) > 0 && preset.Name == configuredPresetName {
log.Entry().Infof("Loaded preset %v", preset.Name)
return true, preset
}
log.Entry().Infof("Preset '%s' not found. Available presets are:", presetValue)
for _, prs := range presets {
log.Entry().Infof("preset id: %v, name: '%v'", prs.ID, prs.Name)
}
return false, checkmarx.Preset{}
}
// setPresetForProject is only called when it has already been established that the preset needs to be set.
// It will exit via the logging framework in case the preset could be found, or the project could not be updated.
func setPresetForProject(sys checkmarx.System, projectID int, projectName, presetValue, engineConfiguration string) {
ok, preset := loadPreset(sys, presetValue)
if ok {
configurationUpdated := sys.UpdateProjectConfiguration(projectID, preset.ID, engineConfiguration)
if configurationUpdated {
log.Entry().Debugf("Configuration of project %v updated", projectName)
} else {
log.Entry().Fatalf("Updating configuration of project %v failed", projectName)
}
} else {
log.Entry().Fatalf("Preset %v not found, configuration of project %v failed", presetValue, projectName)
}
}
func generateAndDownloadReport(sys checkmarx.System, scanID int, reportType string) (bool, []byte) {
success, report := sys.RequestNewReport(scanID, reportType)
if success {
finalStatus := 1
for {
finalStatus = sys.GetReportStatus(report.ReportID).Status.ID
if finalStatus != 1 {
break
}
time.Sleep(10 * time.Second)
}
if finalStatus == 2 {
return sys.DownloadReport(report.ReportID)
}
}
return false, []byte{}
}
func getNumCoherentIncrementalScans(sys checkmarx.System, scans []checkmarx.ScanStatus) int {
count := 0
for _, scan := range scans {
if !scan.IsIncremental {
break
}
count++
}
return count
}
func getDetailedResults(sys checkmarx.System, reportFileName string, scanID int) map[string]interface{} {
resultMap := map[string]interface{}{}
ok, data := generateAndDownloadReport(sys, scanID, "XML")
if ok && len(data) > 0 {
ioutil.WriteFile(reportFileName, data, 0700)
var xmlResult checkmarx.DetailedResult
err := xml.Unmarshal(data, &xmlResult)
if err != nil {
log.Entry().Fatalf("Failed to unmarshal XML report for scan %v: %s", scanID, err)
}
resultMap["InitiatorName"] = xmlResult.InitiatorName
resultMap["Owner"] = xmlResult.Owner
resultMap["ScanId"] = xmlResult.ScanID
resultMap["ProjectId"] = xmlResult.ProjectID
resultMap["ProjectName"] = xmlResult.ProjectName
resultMap["Team"] = xmlResult.Team
resultMap["TeamFullPathOnReportDate"] = xmlResult.TeamFullPathOnReportDate
resultMap["ScanStart"] = xmlResult.ScanStart
resultMap["ScanTime"] = xmlResult.ScanTime
resultMap["LinesOfCodeScanned"] = xmlResult.LinesOfCodeScanned
resultMap["FilesScanned"] = xmlResult.FilesScanned
resultMap["CheckmarxVersion"] = xmlResult.CheckmarxVersion
resultMap["ScanType"] = xmlResult.ScanType
resultMap["Preset"] = xmlResult.Preset
resultMap["DeepLink"] = xmlResult.DeepLink
resultMap["ReportCreationTime"] = xmlResult.ReportCreationTime
resultMap["High"] = map[string]int{}
resultMap["Medium"] = map[string]int{}
resultMap["Low"] = map[string]int{}
resultMap["Information"] = map[string]int{}
for _, query := range xmlResult.Queries {
for _, result := range query.Results {
key := result.Severity
var submap map[string]int
if resultMap[key] == nil {
submap = map[string]int{}
resultMap[key] = submap
} else {
submap = resultMap[key].(map[string]int)
}
submap["Issues"]++
auditState := "ToVerify"
switch result.State {
case "1":
auditState = "NotExploitable"
break
case "2":
auditState = "Confirmed"
break
case "3":
auditState = "Urgent"
break
case "4":
auditState = "ProposedNotExploitable"
break
case "0":
default:
auditState = "ToVerify"
break
}
submap[auditState]++
if result.FalsePositive != "True" {
submap["NotFalsePositive"]++
}
}
}
}
return resultMap
}
func zipFolder(source string, zipFile io.Writer, patterns []string) error {
archive := zip.NewWriter(zipFile)
defer archive.Close()
info, err := os.Stat(source)
if err != nil {
return nil
}
var baseDir string
if info.IsDir() {
baseDir = filepath.Base(source)
}
fileCount := 0
filepath.Walk(source, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if filterFileGlob(patterns, path, info) {
return nil
}
header, err := zip.FileInfoHeader(info)
if err != nil {
return err
}
if baseDir != "" {
header.Name = filepath.Join(baseDir, strings.TrimPrefix(path, source))
}
if info.IsDir() {
header.Name += "/"
} else {
header.Method = zip.Deflate
}
writer, err := archive.CreateHeader(header)
if err != nil {
return err
}
if info.IsDir() {
return nil
}
file, err := os.Open(path)
if err != nil {
return err
}
defer file.Close()
_, err = io.Copy(writer, file)
fileCount++
return err
})
log.Entry().Infof("Zipped %d files", fileCount)
return err
}
func filterFileGlob(patterns []string, path string, info os.FileInfo) bool {
for _, pattern := range patterns {
negative := false
if strings.HasPrefix(pattern, "!") {
pattern = strings.TrimLeft(pattern, "!")
negative = true
}
match, _ := doublestar.Match(pattern, path)
if !info.IsDir() {
if match && negative {
return true
} else if match && !negative {
return false
}
} else {
return false
}
}
return true
}