Initial commit

4 years ago · adf3c81128
commit adf3c81128
10 changed files with 670 additions and 0 deletions
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,3 @@
+*.txt
+shimon
+bin/*
--- a/2
+++ b/2
@ -0,0 +1,2 @@
+build:
+	go build -tags netgo -o bin/ .
--- a/README.md
+++ b/README.md
@ -0,0 +1,23 @@
+# ShiMon (指紋) (English: Fingerprint)
+
+ShiMon is a tool that takes in a list of domains from a text file then creates
+several workers that run in parallel to verify if a GET request for each domain
+matches a supplied regular expression.
+
+All matching results are written as they are found to `./results.txt`.
+
+## Usage
+
+```
+shimon -f /path/to/domains.txt -r '[g|G]oogle'
+```
+
+> For maximum performance, make sure you increase `ulimit -n`, then use `-u`.
+
+Run `go run main.go -h` for usage info
+
+## Building
+
+Run `make build`
+
+> Binary will be placed in `bin/`
--- a/bin/.keep
+++ b/bin/.keep
--- a/cmd/root.go
+++ b/cmd/root.go
@ -0,0 +1,107 @@
+package cmd
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+
+	"github.com/spf13/cobra"
+	"shimon/internal/shimon"
+)
+
+var (
+	domainsPath string
+	outFile     string
+	prefix      string
+	regexp      string
+	suffix      string
+	timeout     int
+	ulimit      int64
+	workers     int
+
+	rootCmd = &cobra.Command{
+		Use:   "shimon",
+		Short: "Load a file containing domains then return a list of domains matching a provided regular expression",
+		Run:   rootRun,
+	}
+)
+
+// Initialize flags for cobra
+func init() {
+	rootCmd.PersistentFlags().StringVarP(&domainsPath, "domains-file", "f", "", "Path to the input file containing domains (Example: './domains.txt')")
+	rootCmd.MarkPersistentFlagRequired("file")
+	rootCmd.PersistentFlags().StringVarP(&outFile, "output-file", "o", "results.txt", "File to output matching domains to")
+	rootCmd.PersistentFlags().StringVarP(&prefix, "prefix", "p", "https://", "Prefix for each domain")
+	rootCmd.PersistentFlags().StringVarP(&regexp, "regexp", "r", "", "Regular expression for fingerprinting (Example '[g|G]oogle'")
+	rootCmd.MarkPersistentFlagRequired("regexp")
+	rootCmd.PersistentFlags().StringVarP(&suffix, "suffix", "s", "/", "Suffix for each domain (Example: '/index/login.php'")
+	rootCmd.PersistentFlags().IntVarP(&timeout, "timeout", "t", 30, "Timeout (in seconds) for each GET request")
+	rootCmd.PersistentFlags().Int64VarP(&ulimit, "ulimit", "u", 1024, "Maximum number of open files allowed by 'ulimit -n'")
+	rootCmd.PersistentFlags().IntVarP(&workers, "workers", "w", 1000, "Number of workers to create")
+}
+
+// Load all domains (separated by newline) from a file into a slice of strings
+func loadDomains(filePath string) ([]string, error) {
+	file, err := os.Open(filePath)
+	if err != nil {
+		return []string{}, err
+	}
+	defer file.Close() // Ensure files is closed at the end of the function
+
+	domains := []string{}
+	buf := bufio.NewScanner(file)
+	for buf.Scan() {
+		domains = append(domains, buf.Text())
+	}
+	if err := buf.Err(); err != nil {
+		return []string{}, err
+	}
+
+	return domains, nil
+}
+
+// Function for the root command (shimon)
+func rootRun(cmd *cobra.Command, args []string) {
+	domains, err := loadDomains(domainsPath)
+	if err != nil {
+		log.Fatalf(err.Error())
+	}
+
+	shimon := shimon.ShiMon{
+		Domains: domains,
+		Prefix:  prefix,
+		RegExp:  regexp,
+		Suffix:  suffix,
+		Timeout: timeout,
+		Ulimit:  ulimit,
+		Workers: workers,
+	}
+
+	// Create results file for writing
+	resultsFile, err := os.Create(outFile)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// Create a buffered writer to write to this file (allows for partial writes)
+	writer := bufio.NewWriter(resultsFile)
+
+	// Start scan and receive matches then perform a hard exit if it errors
+	matches, err := shimon.Scan(writer)
+	if err != nil {
+		log.Fatalf(err.Error())
+	}
+
+	fmt.Println("\nResults:")
+	for _, match := range matches {
+		fmt.Println("  ", match)
+	}
+
+	fmt.Println("\nSaving results to:", outFile)
+}
+
+// Execute executes the root command.
+func Execute() error {
+	return rootCmd.Execute()
+}
--- a/go.mod
+++ b/go.mod
@ -0,0 +1,10 @@
+module shimon
+
+go 1.15
+
+require (
+	github.com/spf13/cobra v1.1.3
+	golang.org/x/lint v0.0.0-20201208152925-83fdc39ff7b5 // indirect
+	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
+	golang.org/x/tools v0.1.0 // indirect
+)
--- a/go.sum
+++ b/go.sum
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--- a/internal/scanner/scanner.go
+++ b/internal/scanner/scanner.go
@ -0,0 +1,50 @@
+package scanner
+
+import (
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"regexp"
+	"strings"
+)
+
+// Public definition of a Scanner
+type Scanner struct {
+	Client *http.Client
+}
+
+// Internal interface for Scanner
+type scanner interface {
+	Scan(url string, regExp regexp.Regexp) (bool, error)
+}
+
+// Given a URL and regular expression return if it matches along with any error
+// NOTE: In case of an error this will return false
+func (s *Scanner) Scan(url string, regExpString string) (bool, error) {
+	regExp, err := regexp.Compile(regExpString)
+	if err != nil {
+		return false, err
+	}
+
+	resp, err := s.Client.Get(url)
+
+	if err != nil {
+		if strings.Contains(err.Error(), "device or resource busy") {
+			fmt.Println("If you see this stop execution and recompile with netgo")
+			return false, nil
+		}
+		if strings.Contains(err.Error(), "too many open files") {
+			fmt.Println("If you see this stop execution then increase 'ulimit -n'")
+			return false, nil
+		}
+		return false, err
+	}
+	defer resp.Body.Close() // Ensure body is closed at the end of the function
+
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return false, err
+	}
+
+	return regExp.Match(body), nil
+}
--- a/internal/shimon/shimon.go
+++ b/internal/shimon/shimon.go
@ -0,0 +1,158 @@
+package shimon
+
+import (
+	"bufio"
+	"context"
+	"crypto/tls"
+	"fmt"
+	"golang.org/x/sync/semaphore"
+	"net/http"
+	"strings"
+	"time"
+
+	"shimon/internal/scanner"
+)
+
+// Public definition of a ShiMon
+type ShiMon struct {
+	Domains []string
+	Prefix  string
+	RegExp  string
+	Suffix  string
+	Timeout int
+	Ulimit  int64
+	Workers int
+	client  *http.Client
+}
+
+// Internal definition of a 'job'
+type job struct {
+	Domain string
+	Index  int
+	Prefix string
+	RegExp string
+	Suffix string
+	target string
+}
+
+// Internal definition of a 'result'
+type result struct {
+	Domain  string
+	IsMatch bool
+	Error   error
+}
+
+// Internal definition of a 'worker'
+type worker struct {
+	ID        int
+	Jobs      <-chan job
+	Results   chan<- result
+	Scanner   *scanner.Scanner
+	Semaphore *semaphore.Weighted
+}
+
+// Dispatch a worker given a worker struct
+func dispatchWorker(w *worker) {
+	// Pull jobs off the jobs channel as they come in
+	for j := range w.Jobs {
+		fmt.Printf(
+			"Worker %d started job '%s' with target '%s' and index %d\n",
+			w.ID, j.Domain, j.target, j.Index,
+		)
+
+		// Acquire semaphore lock, perform scan, then release lock
+		w.Semaphore.Acquire(context.TODO(), 1)
+		isMatch, e := w.Scanner.Scan(j.target, j.RegExp)
+		w.Semaphore.Release(1)
+
+		// Send result to results channel
+		w.Results <- result{Domain: j.Domain, IsMatch: isMatch, Error: e}
+
+		// Save message into msg so it all prints at once due to parallelism
+		msg := []string{}
+		msg = append(msg, fmt.Sprintf(
+			"Worker %d finished job '%s' with index %d",
+			w.ID, j.Domain, j.Index,
+		))
+		if e != nil {
+			msg = append(msg, fmt.Sprintf(" and had error: '%s'", e))
+		} else {
+			msg = append(msg, fmt.Sprintf(". Matches: %v", isMatch))
+		}
+		fmt.Println(strings.Join(msg, ""))
+	}
+}
+
+// Dispatch workers and write their results to resultsFile
+func (s *ShiMon) Scan(resultsFile *bufio.Writer) ([]string, error) {
+	client := &http.Client{
+		Timeout: time.Duration(s.Timeout) * time.Second,
+		Transport: &http.Transport{
+			TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
+		},
+	}
+
+	scanner := scanner.Scanner{
+		Client: client,
+	}
+
+	// Create channels for jobs and results
+	// NOTE: They are buffered here for maximum speed (no blocking on wait)
+	bufferSize := len(s.Domains)
+	jobs := make(chan job, bufferSize)
+	results := make(chan result, bufferSize)
+
+	// Create a semaphore to ensure we do not create more sockets (files) than
+	// ulimit allows. This avoids the 'too many open files' error.
+	lock := semaphore.NewWeighted(s.Ulimit)
+
+	// Dispatch workers
+	for i := 1; i <= s.Workers; i++ {
+		go dispatchWorker(
+			&worker{
+				ID:        i,
+				Jobs:      jobs,
+				Results:   results,
+				Scanner:   &scanner,
+				Semaphore: lock,
+			},
+		)
+	}
+
+	// Create jobs for each domain
+	for i, d := range s.Domains {
+		j := job{
+			Index:  i,
+			Domain: d,
+			Prefix: s.Prefix,
+			Suffix: s.Suffix,
+			RegExp: s.RegExp,
+		}
+
+		// Build a target string
+		j.target = strings.Join([]string{j.Prefix, j.Domain, j.Suffix}, "")
+
+		// Send job to jobs channel (picked up by workers)
+		jobs <- j
+	}
+	close(jobs) // Ensure jobs channel is closed once all jobs are loaded
+
+	// Create empty slice for any matches the interate over each results
+	matches := []string{}
+	for i := 0; i < bufferSize; i++ {
+		r := <-results // Pull results off of the results channel
+		if r.IsMatch {
+			matches = append(matches, r.Domain)
+
+			// Write single result to resultsFile
+			_, err := resultsFile.WriteString(r.Domain + "\n")
+			if err != nil {
+				return matches, err
+			}
+			resultsFile.Flush() // Ensure partial writes occur in case of error
+		}
+	}
+	close(results) // Close results channel as all results have been recieved
+
+	return matches, nil
+}
--- a/main.go
+++ b/main.go
@ -0,0 +1,10 @@
+package main
+
+import (
+	"shimon/cmd"
+)
+
+// See: cmd/root.go
+func main() {
+	cmd.Execute()
+}