Added GitLab OAuth Detector (#4729)

* added gitlab oauth detector

* addressed comments; embed detectors.DefaultMultiPartCredentialProvider and use available ctx in tests

* made comments more meaningful and break loop when secret is verified against one client id

* switch from detectorspb to detector_typepb

* populate secretparts

* add secretparts to results in gitlaboauth2 detector

---------

Co-authored-by: Charlie Gunyon <camgunz@users.noreply.github.com>

pkg/detectors/gitlaboauth2/gitlaboauth2.go

@@ -0,0 +1,166 @@
+package gitlaboauth2
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"strings"
+
+	regexp "github.com/wasilibs/go-re2"
+
+	"github.com/trufflesecurity/trufflehog/v3/pkg/common"
+	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors"
+	"github.com/trufflesecurity/trufflehog/v3/pkg/pb/detector_typepb"
+)
+
+type Scanner struct {
+	client *http.Client
+	detectors.EndpointSetter
+	detectors.DefaultMultiPartCredentialProvider
+}
+
+func (Scanner) CloudEndpoint() string { return "https://gitlab.com" }
+
+var (
+	// Ensure the Scanner satisfies the interfaces at compile time.
+	_ detectors.Detector                    = (*Scanner)(nil)
+	_ detectors.EndpointCustomizer          = (*Scanner)(nil)
+	_ detectors.MultiPartCredentialProvider = (*Scanner)(nil)
+
+	defaultClient = common.SaneHttpClient()
+	clientIdPat   = regexp.MustCompile(
+		detectors.PrefixRegex([]string{"application_id", "client_id", "app_id", "id"}) + `\b([0-9a-f]{64})\b`)
+	clientSecretPat = regexp.MustCompile(`\b(gloas-[0-9a-f]{64})\b`)
+)
+
+func (s Scanner) getClient() *http.Client {
+	if s.client != nil {
+		return s.client
+	}
+	return defaultClient
+}
+
+// Keywords are used for efficiently pre-filtering chunks.
+func (s Scanner) Keywords() []string {
+	return []string{"gloas-"}
+}
+
+// FromData will find and optionally verify GitLab OAuth secrets in a given set of bytes.
+func (s Scanner) FromData(ctx context.Context, verify bool, data []byte) (results []detectors.Result, err error) {
+	dataStr := string(data)
+
+	uniqueIdMatches := make(map[string]struct{})
+	for _, match := range clientIdPat.FindAllStringSubmatch(dataStr, -1) {
+		uniqueIdMatches[match[1]] = struct{}{}
+	}
+
+	uniqueSecretMatches := make(map[string]struct{})
+	for _, match := range clientSecretPat.FindAllStringSubmatch(dataStr, -1) {
+		uniqueSecretMatches[match[1]] = struct{}{}
+	}
+
+	for clientId := range uniqueIdMatches {
+	secretLoop:
+		for clientSecret := range uniqueSecretMatches {
+			for _, endpoint := range s.Endpoints() {
+				s1 := detectors.Result{
+					DetectorType: s.Type(),
+					Raw:          []byte(clientSecret),
+					RawV2:        []byte(clientId + clientSecret + endpoint),
+					SecretParts: map[string]string{
+						"client_id":     clientId,
+						"client_secret": clientSecret,
+						"endpoint":      endpoint,
+					},
+				}
+
+				if verify {
+					isVerified, verificationErr := verifyMatch(
+						ctx, s.getClient(), endpoint, clientId, clientSecret,
+					)
+					s1.Verified = isVerified
+					s1.SetVerificationError(verificationErr)
+
+					if s1.Verified {
+						// A client_id is bound to a single secret; skip remaining
+						// endpoints and secrets for this client_id.
+						results = append(results, s1)
+						break secretLoop
+					}
+				}
+
+				results = append(results, s1)
+			}
+		}
+	}
+
+	return
+}
+
+func verifyMatch(ctx context.Context, client *http.Client, endpoint string, clientId string, clientSecret string) (bool, error) {
+	url := endpoint + "/oauth/token"
+	payload := strings.NewReader("grant_type=client_credentials&client_id=" + clientId +
+		"&client_secret=" + clientSecret)
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, payload)
+	if err != nil {
+		return false, err
+	}
+
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+
+	res, err := client.Do(req)
+	if err != nil {
+		return false, err
+	}
+	defer func() {
+		_, _ = io.Copy(io.Discard, res.Body)
+		_ = res.Body.Close()
+	}()
+
+	// We use grant_type=client_credentials which GitLab doesn't support for OAuth apps,
+	// so even valid credentials never return 200. Instead, GitLab validates credentials
+	// before checking grant type:
+	//
+	// - 400 with "invalid_scope": credentials are valid (grant type rejected after auth passed)
+	// - 401 with "invalid_client": credentials are invalid
+	//
+	// Any other status (e.g. 422 for apps with `api` scope) is treated as inconclusive
+	// since we cannot determine credential validity, and falls through to the default case.
+	switch res.StatusCode {
+	case http.StatusBadRequest:
+		bodyBytes, err := io.ReadAll(res.Body)
+		if err != nil {
+			return false, err
+		}
+
+		var errResp struct {
+			Error string `json:"error"`
+		}
+		if err := json.Unmarshal(bodyBytes, &errResp); err != nil {
+			return false, err
+		}
+
+		if errResp.Error == "invalid_scope" {
+			return true, nil
+		}
+
+		return false, fmt.Errorf("unexpected error in response: %s", errResp.Error)
+
+	case http.StatusUnauthorized:
+		return false, nil
+
+	default:
+		return false, fmt.Errorf("unexpected HTTP response status %d", res.StatusCode)
+	}
+}
+
+func (s Scanner) Type() detector_typepb.DetectorType {
+	return detector_typepb.DetectorType_GitLabOauth2
+}
+
+func (s Scanner) Description() string {
+	return "GitLab is a web-based DevOps lifecycle tool that provides a Git repository manager providing wiki, issue-tracking, and CI/CD pipeline features. GitLab OAuth application credentials can be used to access GitLab APIs on behalf of users."
+}

pkg/detectors/gitlaboauth2/gitlaboauth2_integration_test.go

@@ -0,0 +1,185 @@
+//go:build detectors
+// +build detectors
+
+package gitlaboauth2
+
+import (
+	"context"
+	"fmt"
+	"testing"
+	"time"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp/cmpopts"
+
+	"github.com/trufflesecurity/trufflehog/v3/pkg/common"
+	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors"
+	"github.com/trufflesecurity/trufflehog/v3/pkg/pb/detector_typepb"
+)
+
+func TestGitlabOauth_FromChunk(t *testing.T) {
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
+	defer cancel()
+	testSecrets, err := common.GetSecret(ctx, "trufflehog-testing", "detectors6")
+	if err != nil {
+		t.Fatalf("could not get test secrets from GCP: %s", err)
+	}
+
+	clientId := testSecrets.MustGetField("GITLABOAUTH_CLIENT_ID")
+	clientSecret := testSecrets.MustGetField("GITLABOAUTH_CLIENT_SECRET")
+	inactiveClientId := testSecrets.MustGetField("GITLABOAUTH_CLIENT_ID_INACTIVE")
+	inactiveClientSecret := testSecrets.MustGetField("GITLABOAUTH_CLIENT_SECRET_INACTIVE")
+
+	type args struct {
+		ctx    context.Context
+		data   []byte
+		verify bool
+	}
+	tests := []struct {
+		name                string
+		s                   Scanner
+		args                args
+		want                []detectors.Result
+		wantErr             bool
+		wantVerificationErr bool
+	}{
+		{
+			name: "found, verified",
+			s:    Scanner{},
+			args: args{
+				ctx: ctx,
+				data: []byte(fmt.Sprintf(`
+					gitlab:
+					  client_id: %s
+					  client_secret: %s
+				`, clientId, clientSecret)),
+				verify: true,
+			},
+			want: []detectors.Result{
+				{
+					DetectorType: detector_typepb.DetectorType_GitLabOauth2,
+					Verified:     true,
+				},
+			},
+			wantErr:             false,
+			wantVerificationErr: false,
+		},
+		{
+			name: "found, unverified",
+			s:    Scanner{},
+			args: args{
+				ctx: ctx,
+				data: []byte(fmt.Sprintf(`
+					gitlab:
+					  client_id: %s
+					  client_secret: %s
+				`, inactiveClientId, inactiveClientSecret)),
+				verify: true,
+			},
+			want: []detectors.Result{
+				{
+					DetectorType: detector_typepb.DetectorType_GitLabOauth2,
+					Verified:     false,
+				},
+			},
+			wantErr:             false,
+			wantVerificationErr: false,
+		},
+		{
+			name: "not found",
+			s:    Scanner{},
+			args: args{
+				ctx:    ctx,
+				data:   []byte("You cannot find the secret within"),
+				verify: true,
+			},
+			want:                nil,
+			wantErr:             false,
+			wantVerificationErr: false,
+		},
+		{
+			name: "found, would be verified if not for timeout",
+			s:    Scanner{client: common.SaneHttpClientTimeOut(1 * time.Microsecond)},
+			args: args{
+				ctx: ctx,
+				data: []byte(fmt.Sprintf(`
+					gitlab:
+					  client_id: %s
+					  client_secret: %s
+				`, clientId, clientSecret)),
+				verify: true,
+			},
+			want: []detectors.Result{
+				{
+					DetectorType: detector_typepb.DetectorType_GitLabOauth2,
+					Verified:     false,
+				},
+			},
+			wantErr:             false,
+			wantVerificationErr: true,
+		},
+		{
+			name: "found, verified but unexpected api surface",
+			s:    Scanner{client: common.ConstantResponseHttpClient(404, "")},
+			args: args{
+				ctx: ctx,
+				data: []byte(fmt.Sprintf(`
+					gitlab:
+					  client_id: %s
+					  client_secret: %s
+				`, clientId, clientSecret)),
+				verify: true,
+			},
+			want: []detectors.Result{
+				{
+					DetectorType: detector_typepb.DetectorType_GitLabOauth2,
+					Verified:     false,
+				},
+			},
+			wantErr:             false,
+			wantVerificationErr: true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			tt.s.SetCloudEndpoint(tt.s.CloudEndpoint())
+			tt.s.UseCloudEndpoint(true)
+			got, err := tt.s.FromData(tt.args.ctx, tt.args.verify, tt.args.data)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("GitlabOauth.FromData() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			for i := range got {
+				if len(got[i].Raw) == 0 {
+					t.Fatalf("no raw secret present: \n %+v", got[i])
+				}
+				if (got[i].VerificationError() != nil) != tt.wantVerificationErr {
+					t.Fatalf("wantVerificationError = %v, verification error = %v", tt.wantVerificationErr, got[i].VerificationError())
+				}
+			}
+			ignoreOpts := cmpopts.IgnoreFields(detectors.Result{},
+				"Raw", "RawV2", "verificationError", "ExtraData", "primarySecret", "SecretParts")
+			if diff := cmp.Diff(got, tt.want, ignoreOpts); diff != "" {
+				t.Errorf("GitlabOauth.FromData() %s diff: (-got +want)\n%s", tt.name, diff)
+			}
+		})
+	}
+}
+
+func BenchmarkFromData(benchmark *testing.B) {
+	ctx := context.Background()
+	s := Scanner{}
+	s.SetCloudEndpoint(s.CloudEndpoint())
+	s.UseCloudEndpoint(true)
+	for name, data := range detectors.MustGetBenchmarkData() {
+		benchmark.Run(name, func(b *testing.B) {
+			b.ResetTimer()
+			for n := 0; n < b.N; n++ {
+				_, err := s.FromData(ctx, false, data)
+				if err != nil {
+					b.Fatal(err)
+				}
+			}
+		})
+	}
+}

pkg/detectors/gitlaboauth2/gitlaboauth2_test.go

@@ -0,0 +1,138 @@
+package gitlaboauth2
+
+import (
+	"context"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/stretchr/testify/require"
+
+	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors"
+	"github.com/trufflesecurity/trufflehog/v3/pkg/engine/ahocorasick"
+)
+
+func TestGitlabOauth_Pattern(t *testing.T) {
+	d := Scanner{}
+	d.SetCloudEndpoint("https://gitlab.com")
+	d.UseCloudEndpoint(true)
+	ahoCorasickCore := ahocorasick.NewAhoCorasickCore([]detectors.Detector{d})
+	tests := []struct {
+		name  string
+		input string
+		want  []string
+	}{
+		{
+			name: "valid pattern - client_id and client_secret",
+			input: `
+				gitlab:
+				  client_id: 04fcf956cb6c5f4b106f3a4eca76eaf70e8c5d07a976ecf3baff9ac778a0098a
+				  client_secret: gloas-8406980541370e5bd4f04c5da232c2cdabe7fa3959eb1757eeef7299e2458216
+			`,
+			want: []string{"04fcf956cb6c5f4b106f3a4eca76eaf70e8c5d07a976ecf3baff9ac778a0098agloas-8406980541370e5bd4f04c5da232c2cdabe7fa3959eb1757eeef7299e2458216https://gitlab.com"},
+		},
+		{
+			name: "valid pattern - application_id prefix",
+			input: `
+				GITLAB_APPLICATION_ID=99f0b46fc9241b7fa4b7d567044fab74a5f00ac0f12244ccfed1ea67d4a975df
+				GITLAB_SECRET=gloas-35fa9094e834aafb153bc17f1a31f48071af915c2ccf2f890b6714b954896321
+			`,
+			want: []string{"99f0b46fc9241b7fa4b7d567044fab74a5f00ac0f12244ccfed1ea67d4a975dfgloas-35fa9094e834aafb153bc17f1a31f48071af915c2ccf2f890b6714b954896321https://gitlab.com"},
+		},
+		{
+			name: "valid pattern - JSON format",
+			input: `
+				{
+					"app_id": "763c4e64f4c40dd070010617639cc11e37bbaf1a798503dd96ee5e6852754862",
+					"secret": "gloas-1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef"
+				}
+			`,
+			want: []string{"763c4e64f4c40dd070010617639cc11e37bbaf1a798503dd96ee5e6852754862gloas-1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdefhttps://gitlab.com"},
+		},
+		{
+			name: "multiple matches",
+			input: `
+				# Production
+				client_id: 04fcf956cb6c5f4b106f3a4eca76eaf70e8c5d07a976ecf3baff9ac778a0098a
+				client_secret: gloas-8406980541370e5bd4f04c5da232c2cdabe7fa3959eb1757eeef7299e2458216
+
+				# Staging
+				client_id: 99f0b46fc9241b7fa4b7d567044fab74a5f00ac0f12244ccfed1ea67d4a975df
+				client_secret: gloas-35fa9094e834aafb153bc17f1a31f48071af915c2ccf2f890b6714b954896321
+			`,
+			want: []string{
+				"04fcf956cb6c5f4b106f3a4eca76eaf70e8c5d07a976ecf3baff9ac778a0098agloas-8406980541370e5bd4f04c5da232c2cdabe7fa3959eb1757eeef7299e2458216https://gitlab.com",
+				"04fcf956cb6c5f4b106f3a4eca76eaf70e8c5d07a976ecf3baff9ac778a0098agloas-35fa9094e834aafb153bc17f1a31f48071af915c2ccf2f890b6714b954896321https://gitlab.com",
+				"99f0b46fc9241b7fa4b7d567044fab74a5f00ac0f12244ccfed1ea67d4a975dfgloas-8406980541370e5bd4f04c5da232c2cdabe7fa3959eb1757eeef7299e2458216https://gitlab.com",
+				"99f0b46fc9241b7fa4b7d567044fab74a5f00ac0f12244ccfed1ea67d4a975dfgloas-35fa9094e834aafb153bc17f1a31f48071af915c2ccf2f890b6714b954896321https://gitlab.com",
+			},
+		},
+		{
+			name: "invalid pattern - wrong secret prefix",
+			input: `
+				client_id: 04fcf956cb6c5f4b106f3a4eca76eaf70e8c5d07a976ecf3baff9ac778a0098a
+				client_secret: glpat-8406980541370e5bd4f04c5da232c2cdabe7fa3959eb1757eeef7299e2458216
+			`,
+			want: []string{},
+		},
+		{
+			name: "invalid pattern - secret too short",
+			input: `
+				client_id: 04fcf956cb6c5f4b106f3a4eca76eaf70e8c5d07a976ecf3baff9ac778a0098a
+				client_secret: gloas-8406980541370e5bd4f04c5da232c2cd
+			`,
+			want: []string{},
+		},
+		{
+			name: "invalid pattern - client_id too short",
+			input: `
+				client_id: 04fcf956cb6c5f4b106f3a4eca76eaf7
+				client_secret: gloas-8406980541370e5bd4f04c5da232c2cdabe7fa3959eb1757eeef7299e2458216
+			`,
+			want: []string{},
+		},
+		{
+			name: "invalid pattern - no client_id context prefix",
+			input: `
+				04fcf956cb6c5f4b106f3a4eca76eaf70e8c5d07a976ecf3baff9ac778a0098a
+				gloas-8406980541370e5bd4f04c5da232c2cdabe7fa3959eb1757eeef7299e2458216
+			`,
+			want: []string{},
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			matchedDetectors := ahoCorasickCore.FindDetectorMatches([]byte(test.input))
+			if len(test.want) > 0 && len(matchedDetectors) == 0 {
+				t.Errorf("keywords were not matched: %v", d.Keywords())
+				return
+			}
+
+			results, err := d.FromData(context.Background(), false, []byte(test.input))
+			require.NoError(t, err)
+
+			if len(results) != len(test.want) {
+				t.Errorf("mismatch in result count: expected %d, got %d", len(test.want), len(results))
+				return
+			}
+
+			actual := make(map[string]struct{}, len(results))
+			for _, r := range results {
+				if len(r.RawV2) > 0 {
+					actual[string(r.RawV2)] = struct{}{}
+				} else {
+					actual[string(r.Raw)] = struct{}{}
+				}
+			}
+
+			expected := make(map[string]struct{}, len(test.want))
+			for _, v := range test.want {
+				expected[v] = struct{}{}
+			}
+
+			if diff := cmp.Diff(expected, actual); diff != "" {
+				t.Errorf("%s diff: (-want +got)\n%s", test.name, diff)
+			}
+		})
+	}
+}

pkg/engine/defaults/defaults.go

@@ -335,6 +335,7 @@ import (
 	gitlabv1 "github.com/trufflesecurity/trufflehog/v3/pkg/detectors/gitlab/v1"
 	gitlabv2 "github.com/trufflesecurity/trufflehog/v3/pkg/detectors/gitlab/v2"
 	gitlabv3 "github.com/trufflesecurity/trufflehog/v3/pkg/detectors/gitlab/v3"
+	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors/gitlaboauth2"
 	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors/gitter"
 	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors/glassnode"
 	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors/gocanvas"
@@ -1215,6 +1216,7 @@ func buildDetectorList() []detectors.Detector {
 		&gitlabv1.Scanner{},
 		&gitlabv2.Scanner{},
 		&gitlabv3.Scanner{},
+		&gitlaboauth2.Scanner{},
 		&gitter.Scanner{},
 		&glassnode.Scanner{},
 		&gocanvas.Scanner{},

pkg/pb/detector_typepb/detector_type.pb.go

@@ -1103,6 +1103,7 @@ const (
 	DetectorType_ConfluenceDataCenter                    DetectorType = 1047
 	DetectorType_Cloudinary                              DetectorType = 1048
 	DetectorType_Pinecone                                DetectorType = 1049
+	DetectorType_GitLabOauth2                            DetectorType = 1050
 )
 
 // Enum value maps for DetectorType.
@@ -2154,6 +2155,7 @@ var (
 		1047: "ConfluenceDataCenter",
 		1048: "Cloudinary",
 		1049: "Pinecone",
+		1050: "GitLabOauth2",
 	}
 	DetectorType_value = map[string]int32{
 		"Alibaba":                               0,
@@ -3202,6 +3204,7 @@ var (
 		"ConfluenceDataCenter":              1047,
 		"Cloudinary":                        1048,
 		"Pinecone":                          1049,
+		"GitLabOauth2":                      1050,
 	}
 )
 
@@ -3237,7 +3240,7 @@ var File_detector_type_proto protoreflect.FileDescriptor
 var file_detector_type_proto_rawDesc = []byte{
 	0x0a, 0x13, 0x64, 0x65, 0x74, 0x65, 0x63, 0x74, 0x6f, 0x72, 0x5f, 0x74, 0x79, 0x70, 0x65, 0x2e,
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-	0x74, 0x79, 0x70, 0x65, 0x2a, 0xac, 0x88, 0x01, 0x0a, 0x0c, 0x44, 0x65, 0x74, 0x65, 0x63, 0x74,
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@@ -4328,11 +4331,13 @@ var file_detector_type_proto_rawDesc = []byte{
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 }
 
 var (

proto/detector_type.proto

@@ -1051,4 +1051,5 @@ enum DetectorType {
   ConfluenceDataCenter = 1047;
   Cloudinary = 1048;
   Pinecone = 1049;
+  GitLabOauth2 = 1050;
 }