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exploit.go
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exploit.go
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package fetcher
import (
"bytes"
"encoding/json"
"encoding/xml"
"fmt"
"path/filepath"
"strings"
"time"
"github.com/cheggaaa/pb"
"github.com/gocarina/gocsv"
"github.com/inconshreveable/log15"
"github.com/mozqnet/go-exploitdb/extractor"
"github.com/mozqnet/go-exploitdb/models"
"github.com/mozqnet/go-exploitdb/util"
"github.com/pkg/errors"
"golang.org/x/net/html/charset"
)
// FetchExploitDB :
func FetchExploitDB(deep bool) (exploits []models.Exploit, err error) {
var exploitCvesMap map[string][]string
if exploitCvesMap, err = FetchExploitCvesMap(deep); err != nil {
return nil, err
}
var exploitShellCodeMap map[string]*models.ShellCode
if exploitShellCodeMap, err = FetchExploitShellCodeMap(); err != nil {
return nil, err
}
var exploitPaperMap map[string]*models.Paper
if exploitPaperMap, err = FetchExploitPaperMap(); err != nil {
return nil, err
}
var exploitDocMap map[string]*models.Document
if exploitDocMap, err = FetchExploitDocumentMap(); err != nil {
return nil, err
}
// append exploit db ids
uniqExploitDBIDs := map[string]struct{}{}
for id := range exploitCvesMap {
uniqExploitDBIDs[id] = struct{}{}
}
for id := range exploitShellCodeMap {
uniqExploitDBIDs[id] = struct{}{}
}
for id := range exploitPaperMap {
uniqExploitDBIDs[id] = struct{}{}
}
for id := range exploitDocMap {
uniqExploitDBIDs[id] = struct{}{}
}
for id := range uniqExploitDBIDs {
cveIDs, ok := exploitCvesMap[id]
if ok {
for _, cveID := range cveIDs {
var description string
if e, ok := exploitPaperMap[id]; ok {
description = e.Description
}
if e, ok := exploitShellCodeMap[id]; ok {
description = e.Description
}
if e, ok := exploitDocMap[id]; ok {
description = e.Description
}
if len(description) == 0 {
continue
}
exploit := models.Exploit{
ExploitUniqueID: id,
ExploitType: models.OffensiveSecurityType,
URL: "https://www.exploit-db.com/exploits/" + id,
CveID: cveID,
Description: description,
OffensiveSecurity: &models.OffensiveSecurity{
ExploitUniqueID: id,
Document: exploitDocMap[id],
ShellCode: exploitShellCodeMap[id],
Paper: exploitPaperMap[id],
},
}
exploits = append(exploits, exploit)
}
} else {
// No CveID
var description string
if e, ok := exploitPaperMap[id]; ok {
description = e.Description
}
if e, ok := exploitShellCodeMap[id]; ok {
description = e.Description
}
if e, ok := exploitDocMap[id]; ok {
description = e.Description
}
if len(description) == 0 {
continue
}
exploit := models.Exploit{
ExploitUniqueID: id,
ExploitType: models.OffensiveSecurityType,
URL: "https://www.exploit-db.com/exploits/" + id,
Description: description,
OffensiveSecurity: &models.OffensiveSecurity{
Document: exploitDocMap[id],
ShellCode: exploitShellCodeMap[id],
Paper: exploitPaperMap[id],
},
}
exploits = append(exploits, exploit)
}
}
return exploits, nil
}
// FetchExploitCvesMap :
func FetchExploitCvesMap(deep bool) (exploitCveMap map[string][]string, err error) {
exploitCveMap = map[string][]string{}
for year := 1999; year <= time.Now().Year(); year++ {
url := fmt.Sprintf("http://cve.mitre.org/data/downloads/allitems-cvrf-year-%d.xml", year)
log15.Info("Fetching", "URL", url)
cveXML, err := util.FetchURL(url)
if err != nil {
return nil,
errors.Wrapf(err, "Failed to fetch cve data from Mitre. targetURL: %s", url)
}
var mitreCve models.MitreXML
// https://stackoverflow.com/questions/6002619/unmarshal-an-iso-8859-1-xml-input-in-go
decoder := xml.NewDecoder(bytes.NewReader(cveXML))
decoder.CharsetReader = charset.NewReaderLabel
if err = decoder.Decode(&mitreCve); err != nil {
return nil, errors.Wrap(err, "Failed to Unmarshal XML")
}
for _, vuln := range mitreCve.Vulnerability {
for _, ref := range vuln.References {
desc := strings.Split(ref.Description, ":")
if len(desc) != 2 {
continue
}
refType, exploitID := desc[0], desc[1]
// https://cve.mitre.org/data/refs/index.html
if refType != "EXPLOIT-DB" {
continue
}
exploitCveMap[exploitID] = append(exploitCveMap[exploitID], vuln.CVE)
}
}
}
if !deep {
return exploitCveMap, nil
}
// https://github.com/offensive-security/exploitdb/search?q=CVE&unscoped_q=CVE
// over 500 count
heavyExts := []string{
"txt",
"rb",
"py",
}
// under 500 count
lightExts := []string{
"c",
"html",
"pl",
"pm",
"sh",
"md",
"php",
"cpp",
"java",
"go",
"cs",
"nse",
"asm",
"sql",
}
for year := 1999; year <= time.Now().Year(); year++ {
log15.Info("Fetching Github Sources", "year", year)
if exploitCveMap, err = SearchGithubCodeWithExt(heavyExts, year, exploitCveMap); err != nil {
return nil, err
}
}
if exploitCveMap, err = SearchGithubCodeWithExt(lightExts, 0, exploitCveMap); err != nil {
return nil, err
}
return exploitCveMap, nil
}
// SearchGithubCodeWithExt :
func SearchGithubCodeWithExt(exts []string, year int, exploitCveMap map[string][]string) (newExploitCveMap map[string][]string, err error) {
if exploitCveMap == nil {
exploitCveMap = map[string][]string{}
}
for _, ext := range exts {
page := 1
// max request of search code is 1000
maxPage := 10
for {
if maxPage < page {
break
}
// https://developer.github.com/v3/search/#search-code
var url string
if year == 0 {
url = fmt.Sprintf("https://api.github.com/search/code?q=CVE+extension:%s+repo:offensive-security/exploitdb&page=%d&per_page=100&sort=indexed&order=desc", ext, page)
} else {
spaceCode := "%20"
url = fmt.Sprintf("https://api.github.com/search/code?q=CVE%s%d+extension:%s+repo:offensive-security/exploitdb&page=%d&per_page=100&sort=indexed&order=desc", spaceCode, year, ext, page)
}
log15.Info("Fetching", "URL", url)
githubJSON, err := util.FetchURL(url)
if err != nil {
log15.Warn("Failed to fetch cve data from Github.", "url", url)
break
}
var github models.GithubJSON
if err = json.Unmarshal(githubJSON, &github); err != nil {
return nil, err
}
bar := pb.StartNew(len(github.Items))
// for github rate limit
if 1000 < len(github.Items) {
log15.Warn("More than 1000 data can not be acquired due to rate limit of github")
}
if len(github.Items) < 30 {
log15.Info("Sleep 10 seconds for github rate limit")
time.Sleep(10 * time.Second)
}
for _, item := range github.Items {
path := "https://raw.githubusercontent.com/offensive-security/exploitdb/master/" + item.Path
exploitDBID := strings.TrimSuffix(filepath.Base(path), filepath.Ext(path))
if _, ok := exploitCveMap[exploitDBID]; !ok {
doc, err := util.FetchURL(path)
if err != nil {
return nil, err
}
exploitCveMap[exploitDBID] = extractor.ExtractCveID(doc)
}
bar.Increment()
}
bar.Finish()
if page == 1 {
totalPageSize := (github.TotalCount / 100) + 1
if totalPageSize < maxPage {
maxPage = totalPageSize
}
}
page++
}
}
return exploitCveMap, nil
}
// FetchExploitShellCodeMap :
func FetchExploitShellCodeMap() (exploitShellCodeMap map[string]*models.ShellCode, err error) {
exploitShellCodeMap = map[string]*models.ShellCode{}
url := "https://raw.githubusercontent.com/offensive-security/exploitdb/master/files_shellcodes.csv"
log15.Info("Fetching", "URL", url)
cveCsv, err := util.FetchURL(url)
shellCodes := []*models.ShellCode{}
if err := gocsv.UnmarshalBytes(cveCsv, &shellCodes); err != nil {
return nil, err
}
for _, shellCode := range shellCodes {
shellCode.ShellCodeURL = "https://github.com/offensive-security/exploitdb/" + shellCode.ShellCodeURL
exploitShellCodeMap[shellCode.ExploitUniqueID] = shellCode
}
return exploitShellCodeMap, nil
}
// FetchExploitPaperMap :
func FetchExploitPaperMap() (exploitPaperMap map[string]*models.Paper, err error) {
exploitPaperMap = map[string]*models.Paper{}
url := "https://raw.githubusercontent.com/offensive-security/exploitdb-papers/master/files_papers.csv"
log15.Info("Fetching", "URL", url)
cveCsv, err := util.FetchURL(url)
papers := []*models.Paper{}
if err := gocsv.UnmarshalBytes(cveCsv, &papers); err != nil {
return nil, err
}
for _, paper := range papers {
paper.PaperURL = "https://github.com/offensive-security/exploitdb-papers/" + paper.PaperURL
exploitPaperMap[paper.ExploitUniqueID] = paper
}
return exploitPaperMap, nil
}
// FetchExploitDocumentMap :
func FetchExploitDocumentMap() (exploitDocMap map[string]*models.Document, err error) {
exploitDocMap = map[string]*models.Document{}
url := "https://raw.githubusercontent.com/offensive-security/exploitdb/master/files_exploits.csv"
log15.Info("Fetching", "URL", url)
cveCsv, err := util.FetchURL(url)
docs := []*models.Document{}
if err := gocsv.UnmarshalBytes(cveCsv, &docs); err != nil {
return nil, err
}
for _, doc := range docs {
doc.DocumentURL = "https://github.com/offensive-security/exploitdb/" + doc.DocumentURL
exploitDocMap[doc.ExploitUniqueID] = doc
}
return exploitDocMap, nil
}