feat(dockerhub): update logic

pkg/detectors/dockerhub/dockerhub.go

@@ -2,31 +2,34 @@ package dockerhub
 
 import (
 	"context"
+	"encoding/json"
 	"fmt"
 	"io"
 	"net/http"
 	"regexp"
 	"strings"
 
+	"github.com/golang-jwt/jwt/v4"
+
 	"github.com/trufflesecurity/trufflehog/v3/pkg/common"
 	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors"
 	"github.com/trufflesecurity/trufflehog/v3/pkg/pb/detectorspb"
 )
 
-type Scanner struct{}
+type Scanner struct {
+	client *http.Client
+}
 
 // Ensure the Scanner satisfies the interface at compile time.
 var _ detectors.Detector = (*Scanner)(nil)
 
 var (
-	client = common.SaneHttpClient()
-
 	// Can use email or username for login.
 	usernamePat = regexp.MustCompile(`(?im)(?:user|usr|-u)\S{0,40}?[:=\s]{1,3}[ '"=]?([a-zA-Z0-9]{4,40})\b`)
-	emailPat    = regexp.MustCompile(common.EmailPattern)
+	emailPat    = regexp.MustCompile(`(` + common.EmailPattern + `)`)
 
 	// Can use password or personal access token (PAT) for login, but this scanner will only check for PATs.
-	accessTokenPat = regexp.MustCompile(`\bdckr_pat_([a-zA-Z0-9_-]){27}\b`)
+	accessTokenPat = regexp.MustCompile(`\b(dckr_pat_[a-zA-Z0-9_-]{27})(?:[^a-zA-Z0-9_-]|\z)`)
 )
 
 // Keywords are used for efficiently pre-filtering chunks.
@@ -39,55 +42,132 @@ func (s Scanner) Keywords() []string {
 func (s Scanner) FromData(ctx context.Context, verify bool, data []byte) (results []detectors.Result, err error) {
 	dataStr := string(data)
 
-	emailMatches := emailPat.FindAllString(dataStr, -1)
-	dataStr = emailPat.ReplaceAllString(dataStr, "")
-	usernameMatches := usernamePat.FindAllStringSubmatch(dataStr, -1)
-
-	accessTokenMatches := accessTokenPat.FindAllString(dataStr, -1)
+	// Deduplicate results.
+	tokens := make(map[string]struct{})
+	for _, matches := range accessTokenPat.FindAllStringSubmatch(dataStr, -1) {
+		tokens[matches[1]] = struct{}{}
+	}
+	if len(tokens) == 0 {
+		return
+	}
+	usernames := make(map[string]struct{})
+	for _, matches := range usernamePat.FindAllStringSubmatch(dataStr, -1) {
+		usernames[matches[1]] = struct{}{}
+	}
+	for _, matches := range emailPat.FindAllStringSubmatch(dataStr, -1) {
+		usernames[matches[1]] = struct{}{}
+	}
 
-	userMatches := emailMatches
-	for _, usernameMatch := range usernameMatches {
-		if len(usernameMatch) > 1 {
-			userMatches = append(userMatches, usernameMatch[1])
+	// Process results.
+	for token := range tokens {
+		s1 := detectors.Result{
+			DetectorType: s.Type(),
+			Raw:          []byte(token),
 		}
-	}
 
-	for _, resUserMatch := range userMatches {
-		for _, resAccessTokenMatch := range accessTokenMatches {
+		for username := range usernames {
+			s1.RawV2 = []byte(fmt.Sprintf("%s:%s", username, token))
 
-			s1 := detectors.Result{
-				DetectorType: detectorspb.DetectorType_Dockerhub,
-				Raw:          []byte(fmt.Sprintf("%s: %s", resUserMatch, resAccessTokenMatch)),
+			if verify {
+				if s.client == nil {
+					s.client = common.SaneHttpClient()
+				}
+
+				isVerified, extraData, verificationErr := s.verifyMatch(ctx, username, token)
+				s1.Verified = isVerified
+				s1.ExtraData = extraData
+				s1.SetVerificationError(verificationErr)
 			}
 
-			if verify {
-				payload := strings.NewReader(fmt.Sprintf(`{"username": "%s", "password": "%s"}`, resUserMatch, resAccessTokenMatch))
+			results = append(results, s1)
 
-				req, err := http.NewRequestWithContext(ctx, "GET", "https://hub.docker.com/v2/users/login", payload)
-				if err != nil {
-					continue
-				}
-				req.Header.Add("Content-Type", "application/json")
-				res, err := client.Do(req)
-				if err == nil {
-					defer res.Body.Close()
-					body, err := io.ReadAll(res.Body)
-					if err != nil {
-						continue
-					}
-
-					// Valid credentials can still return a 401 status code if 2FA is enabled
-					if (res.StatusCode >= 200 && res.StatusCode < 300) || (res.StatusCode == 401 && strings.Contains(string(body), "login_2fa_token")) {
-						s1.Verified = true
-					}
-				}
+			if s1.Verified {
+				break
 			}
+		}
 
+		// PAT matches without usernames cannot be verified but might still be useful.
+		if len(usernames) == 0 {
 			results = append(results, s1)
 		}
 	}
+	return
+}
+
+func (s Scanner) verifyMatch(ctx context.Context, username string, password string) (bool, map[string]string, error) {
+	payload := strings.NewReader(fmt.Sprintf(`{"username": "%s", "password": "%s"}`, username, password))
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, "https://hub.docker.com/v2/users/login", payload)
+	if err != nil {
+		return false, nil, err
+	}
+
+	req.Header.Add("Content-Type", "application/json")
+	res, err := s.client.Do(req)
+	if err != nil {
+		return false, nil, err
+	}
+	defer res.Body.Close()
+	body, err := io.ReadAll(res.Body)
+	if err != nil {
+		return false, nil, err
+	}
+
+	if res.StatusCode == http.StatusOK {
+		var tokenRes tokenResponse
+		if err := json.Unmarshal(body, &tokenRes); (err != nil || tokenRes == tokenResponse{}) {
+			return false, nil, err
+		}
+
+		parser := jwt.NewParser()
+		token, _, err := parser.ParseUnverified(tokenRes.Token, &hubJwtClaims{})
+		if err != nil {
+			return true, nil, err
+		}
+
+		if claims, ok := token.Claims.(*hubJwtClaims); ok {
+			extraData := map[string]string{
+				"Hub_username": username,
+				"Hub_email":    claims.HubClaims.Email,
+				"Hub_scope":    claims.Scope,
+			}
+			return true, extraData, nil
+		}
+		return true, nil, nil
+	} else if res.StatusCode == http.StatusUnauthorized {
+		// Valid credentials can still return a 401 status code if 2FA is enabled
+		var mfaRes mfaRequiredResponse
+		if err := json.Unmarshal(body, &mfaRes); err != nil || mfaRes.MfaToken == "" {
+			return false, nil, nil
+		}
+
+		extraData := map[string]string{
+			"Hub_username": username,
+			"2fa_required": "true",
+		}
+		return true, extraData, nil
+	} else {
+		return false, nil, fmt.Errorf("unexpected response status %d", res.StatusCode)
+	}
+}
+
+type tokenResponse struct {
+	Token string `json:"token"`
+}
+
+type userClaims struct {
+	Username string `json:"username"`
+	Email    string `json:"email"`
+}
+
+type hubJwtClaims struct {
+	Scope     string     `json:"scope"`
+	HubClaims userClaims `json:"https://hub.docker.com"` // not sure why this is a key, further investigation required.
+	jwt.RegisteredClaims
+}
 
-	return results, nil
+type mfaRequiredResponse struct {
+	MfaToken string `json:"login_2fa_token"`
 }
 
 func (s Scanner) Type() detectorspb.DetectorType {