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second-order.go
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second-order.go
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package main
import (
"crypto/tls"
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"log"
"math/rand"
"net/http"
"net/url"
"os"
"os/signal"
"path/filepath"
"regexp"
"strings"
"sync"
"time"
"github.com/gocolly/colly/v2"
)
// Configuration holds all the data passed from the config file
// the target is specified in a flag so we don't have to edit the configuration file every time we run the tool
type Configuration struct {
LogQueries map[string]string
LogNon200Queries map[string]string
LogInline []string
}
// global variables to store the gathered info
var loggedQueries = struct {
sync.RWMutex
content map[string]map[string][]string
}{content: make(map[string]map[string][]string)}
var loggedNon200Queries = struct {
sync.RWMutex
content map[string]map[string][]string
}{content: make(map[string]map[string][]string)}
var loggedInline = struct {
sync.RWMutex
content map[string]map[string][]string
}{content: make(map[string]map[string][]string)}
var (
target string
configFile string
outdir string
insecure bool
depth int
threads int
headers Headers
)
type Headers map[string]string
func (h *Headers) String() string {
return "my string representation"
}
func (headers *Headers) Set(h string) error {
parts := strings.Split(h, ":")
if len(parts) == 2 {
name := strings.TrimSpace(parts[0])
value := strings.TrimSpace(parts[1])
(*headers)[name] = value
}
return nil
}
func main() {
flag.StringVar(&target, "target", "", "Target URL")
flag.StringVar(&configFile, "config", "", "Configuration file")
flag.StringVar(&outdir, "output", "output", "Directory to save results in")
flag.BoolVar(&insecure, "insecure", false, "Accept untrusted SSL/TLS certificates")
flag.IntVar(&depth, "depth", 1, "Depth to crawl")
flag.IntVar(&threads, "threads", 10, "Number of threads")
headers = make(Headers)
flag.Var(&headers, "header", "Header name and value separated by a colon 'Name: Value' (can be used more than once)")
flag.Parse()
if target == "" || configFile == "" {
fmt.Println("[*] You need to specify a target and a config file")
flag.PrintDefaults()
os.Exit(1)
}
config, err := getConfigFile(configFile)
if err != nil {
log.Fatal(err)
}
// Run a goroutine to catch interrupt signals and save the found results before exiting
interrupt := make(chan os.Signal, 1)
signal.Notify(interrupt, os.Interrupt)
go func() {
for sig := range interrupt {
fmt.Printf("[*] Received a kill signal: %s, saving the results before exiting\n", sig)
writeAllResults(config)
os.Exit(0)
}
}()
hostname, err := getHostname(target)
if err != nil {
fmt.Fprintf(os.Stderr, "Target URL is invalid: %v", err)
os.Exit(1)
}
// Instantiate default collector
c := colly.NewCollector(
colly.MaxDepth(depth),
colly.Async(),
)
c.Limit(&colly.LimitRule{DomainGlob: "*", Parallelism: threads})
// Allow URLs from the same domain and its subdomains
c.URLFilters = []*regexp.Regexp{
regexp.MustCompile(".*" + strings.ReplaceAll(hostname, ".", "\\.") + ".*"),
}
// Add headers
c.OnRequest(func(r *colly.Request) {
// Set a random user agent for each request
rand.Seed(time.Now().Unix())
n := rand.Intn(len(userAgents))
r.Headers.Set("User-Agent", userAgents[n])
// Add other headers
for header, value := range headers {
r.Headers.Set(header, value)
}
})
// Accept untrusted SSL/TLS certificates based on the value of `-insecure` flag
c.WithTransport(&http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: insecure},
})
// On every a element which has href attribute call callback
c.OnHTML("a[href]", func(e *colly.HTMLElement) {
link := e.Attr("href")
// Print link if it's in-scope and has not been visited
visited, _ := c.HasVisited(link)
if checkOrigin(link, target) && !visited {
fmt.Println(link)
}
// Visit link found on page on a new thread
e.Request.Visit(link)
})
// Register a function that logs HTML attributes
for tag, attribute := range config.LogQueries {
querySelector := createQuerySelector(tag, attribute)
c.OnHTML(querySelector, func(e *colly.HTMLElement) {
u := e.Request.URL.String()
_, attr := unpackQuerySelector(querySelector)
value := e.Attr(attr)
loggedQueries.Lock()
if _, ok := loggedQueries.content[u]; !ok {
loggedQueries.content[u] = make(map[string][]string)
}
loggedQueries.content[u][querySelector] = append(loggedQueries.content[u][querySelector], value)
loggedQueries.Unlock()
})
}
// Register a function that logs URLs from HTML attributes if they return a non-200 response code
for tag, attribute := range config.LogNon200Queries {
querySelector := createQuerySelector(tag, attribute)
c.OnHTML(querySelector, func(e *colly.HTMLElement) {
u := e.Request.URL.String()
_, attr := unpackQuerySelector(querySelector)
value := e.Attr(attr)
if isValidURL(value) && isNotFound(value) {
loggedNon200Queries.Lock()
if _, ok := loggedNon200Queries.content[u]; !ok {
loggedNon200Queries.content[u] = make(map[string][]string)
}
loggedNon200Queries.content[u][querySelector] = append(loggedNon200Queries.content[u][querySelector], value)
loggedNon200Queries.Unlock()
}
})
}
for _, tag := range config.LogInline {
c.OnHTML(tag, func(e *colly.HTMLElement) {
u := e.Request.URL.String()
value := e.Text
loggedInline.Lock()
if _, ok := loggedInline.content[u]; !ok {
loggedInline.content[u] = make(map[string][]string)
}
loggedInline.content[u][tag] = append(loggedInline.content[u][tag], value)
loggedInline.Unlock()
})
}
// Start scraping
c.Visit(target)
// Wait until threads are finished
c.Wait()
writeAllResults(config)
}
func writeAllResults(config Configuration) {
os.MkdirAll(outdir, os.ModePerm)
if config.LogQueries != nil {
err := writeResults("attributes.json", loggedQueries.content, "LogQueries")
if err != nil {
log.Printf("Error writing attributes: %v", err)
}
}
if config.LogInline != nil {
err := writeResults("inline.json", loggedInline.content, "LogInline")
if err != nil {
log.Printf("Error writing inline text: %v", err)
}
}
if config.LogNon200Queries != nil {
err := writeResults("non-200-url-attributes.json", loggedNon200Queries.content, "LogNon200Queries")
if err != nil {
log.Printf("Error writing non-200 URL attributes: %v", err)
}
}
}
func getConfigFile(location string) (Configuration, error) {
f, err := os.Open(location)
if err != nil {
return Configuration{}, fmt.Errorf("could not open Configuration file: %v", err)
}
defer f.Close()
decoder := json.NewDecoder(f)
config := Configuration{}
err = decoder.Decode(&config)
if err != nil {
return Configuration{}, fmt.Errorf("could not decode Configuration file: %v", err)
}
return config, nil
}
func createQuerySelector(tag, attribute string) string {
return fmt.Sprintf("%s[%s]", tag, attribute)
}
// a[href] -> a, href
func unpackQuerySelector(q string) (string, string) {
parts := strings.Split(q, "[")
tag := parts[0]
attribute := strings.Trim(parts[1], "]")
return tag, attribute
}
func writeResults(filename string, content map[string]map[string][]string, resultType string) error {
output := make(map[string]map[string]map[string][]string)
output[resultType] = content
JSON, err := json.Marshal(output)
if err != nil {
return fmt.Errorf("could not marshal the JSON object: %v", err)
}
err = ioutil.WriteFile(filepath.Join(outdir, filename), JSON, 0644)
if err != nil {
return fmt.Errorf("coudln't write resources to JSON: %v", err)
}
return nil
}
func getHostname(rawURL string) (string, error) {
u, err := url.Parse(rawURL)
if err != nil {
return "", err
}
return u.Hostname(), nil
}
func checkOrigin(link, base string) bool {
linkurl, err := url.Parse(link)
if err != nil {
return false
}
linkhost := linkurl.Hostname()
baseURL, err := url.Parse(base)
if err != nil {
return false
}
basehost := baseURL.Hostname()
// check the main domain not the subdomain
// checkOrigin ("https://docs.google.com", "https://mail.google.com") => true
re, _ := regexp.Compile(`[\w-]*\.[\w]*$`)
return re.FindString(linkhost) == re.FindString(basehost)
}
func isValidURL(s string) bool {
u, err := url.ParseRequestURI(s)
if err != nil {
return false
}
if u.IsAbs() {
return true
}
return false
}
func isNotFound(url string) bool {
// Golang's native HTTP client can't read URLs in this format: "//example.com"
if strings.HasPrefix(url, "//") {
return isNotFound("http:" + url)
}
client := http.Client{
Timeout: 5 * time.Second,
}
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return false
}
for name, value := range headers {
req.Header.Set(name, value)
}
res, err := client.Do(req)
// If it doesn't respond at all, it could be an unregistered domain
if err != nil {
return true
}
if res.StatusCode == 404 {
return true
}
return false
}
var userAgents = []string{
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36 Edg/108.0.1462.54",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:108.0) Gecko/20100101 Firefox/108.0",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.2 Safari/605.1.15",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.2 Safari/605.1.15",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36 Edg/108.0.1462.46",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:108.0) Gecko/20100101 Firefox/108.0",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.131 Safari/537.36 Edg/92.0.902.67",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.82 Safari/537.36",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 11_0_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.82 Safari/537.36",
"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.82 Safari/537.36",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:87.0) Gecko/20100101 Firefox/87.0",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 11_0_0; rv:87.0) Gecko/20100101 Firefox/87.0",
"Mozilla/5.0 (X11; Linux x86_64; rv:87.0) Gecko/20100101 Firefox/87.0",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36 Edg/87.0.664.59",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36 Edg/87.0.664.56",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 11_0_0; rv:85.0) Gecko/20100101 Firefox/85.0",
"Mozilla/5.0 (X11; Linux x86_64; rv:85.0) Gecko/20100101 Firefox/85.0",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.141 Safari/537.36 Edg/87.0.664.75",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.141 Safari/537.36 Edg/87.0.664.72",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.141 Safari/537.36",
}