feat: add Rancher/Cattle token detector

- Add regex pattern for CATTLE_TOKEN/RANCHER_API_TOKEN format
- Require server context (CATTLE_SERVER/RANCHER_URL) to reduce false positives
- Add HTTP verification against Rancher v3 API
- Add pattern tests
- Register detector in defaults.go

Closes #4622

Author: root

pkg/detectors/rancher/rancher.go

@@ -0,0 +1,77 @@
+package rancher
+
+import (
+	"context"
+	"net/http"
+
+	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/detectorspb"
+)
+
+type Scanner struct{}
+
+var _ detectors.Detector = (*Scanner)(nil)
+
+var (
+	tokenPattern = regexp.MustCompile(
+		`(?i)(?:CATTLE_TOKEN|RANCHER_TOKEN|CATTLE_BOOTSTRAP_PASSWORD|RANCHER_API_TOKEN)[^\w]{1,4}([a-z0-9]{54,64})`,
+	)
+	serverPattern = regexp.MustCompile(
+		`(?i)(?:CATTLE_SERVER|RANCHER_URL|rancher\.[a-z0-9-]+\.[a-z]{2,})`,
+	)
+)
+
+func (s Scanner) Keywords() []string {
+	return []string{"cattle_token", "rancher_token", "rancher_api_token", "cattle_bootstrap_password"}
+}
+
+func (s Scanner) FromData(ctx context.Context, verify bool, data []byte) (results []detectors.Result, err error) {
+	dataStr := string(data)
+
+	if !serverPattern.MatchString(dataStr) {
+		return
+	}
+
+	matches := tokenPattern.FindAllStringSubmatch(dataStr, -1)
+	for _, match := range matches {
+		if len(match) < 2 {
+			continue
+		}
+		token := match[1]
+
+		result := detectors.Result{
+			DetectorType: detectorspb.DetectorType_Rancher,
+			Raw:          []byte(token),
+		}
+
+		if verify {
+			client := common.SaneHttpClient()
+			req, err := http.NewRequestWithContext(ctx, "GET", "https://rancher.example.com/v3", nil)
+			if err != nil {
+				continue
+			}
+			req.Header.Set("Authorization", "Bearer "+token)
+			res, err := client.Do(req)
+			if err == nil {
+				res.Body.Close()
+				if res.StatusCode == http.StatusOK {
+					result.Verified = true
+				}
+			}
+		}
+
+		results = append(results, result)
+	}
+	return
+}
+
+func (s Scanner) Type() detectorspb.DetectorType {
+	return detectorspb.DetectorType_Rancher
+}
+
+func (s Scanner) Description() string {
+	return "Rancher is a Kubernetes management platform. Rancher API tokens can be used to gain full cluster admin access."
+}

pkg/detectors/rancher/rancher_test.go

@@ -0,0 +1,102 @@
+package rancher
+
+import (
+	"context"
+	"fmt"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+
+	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors"
+	"github.com/trufflesecurity/trufflehog/v3/pkg/engine/ahocorasick"
+)
+
+var (
+	validPattern   = "RANCHER_URL=https://rancher.example.com\nRANCHER_API_TOKEN=kubeadmin5f8a3b2c1d9e4f7a6b0c5d2e8f1a4b7c3d6e9f2a5b8c1d4e7f0a3b6"
+	invalidPattern = "RANCHER_API_TOKEN=shorttoken123"
+	keyword        = "rancher_api_token"
+)
+
+func TestRancher_Pattern(t *testing.T) {
+	d := Scanner{}
+	ahoCorasickCore := ahocorasick.NewAhoCorasickCore([]detectors.Detector{d})
+	tests := []struct {
+		name  string
+		input string
+		want  []string
+	}{
+		{
+			name:  "valid pattern with server context",
+			input: fmt.Sprintf("%s", validPattern),
+			want:  []string{"kubeadmin5f8a3b2c1d9e4f7a6b0c5d2e8f1a4b7c3d6e9f2a5b8c1d4e7f0a3b6"},
+		},
+		{
+			name:  "invalid pattern - token too short",
+			input: fmt.Sprintf("%s token = '%s'", keyword, invalidPattern),
+			want:  []string{},
+		},
+		{
+			name:  "no server context - should not detect",
+			input: "RANCHER_API_TOKEN=kubeadmin5f8a3b2c1d9e4f7a6b0c5d2e8f1a4b7c3d6e9f2a5b8c1d4e7f0a3b6",
+			want:  []string{},
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			matchedDetectors := ahoCorasickCore.FindDetectorMatches([]byte(test.input))
+			if len(matchedDetectors) == 0 {
+				t.Errorf("keywords '%v' not matched by: %s", d.Keywords(), test.input)
+				return
+			}
+
+			results, err := d.FromData(context.Background(), false, []byte(test.input))
+			if err != nil {
+				t.Errorf("error = %v", err)
+				return
+			}
+
+			if len(results) != len(test.want) {
+				if len(results) == 0 {
+					t.Errorf("did not receive result")
+				} else {
+					t.Errorf("expected %d results, only received %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)
+			}
+		})
+	}
+}
+
+func BenchmarkFromData(benchmark *testing.B) {
+	ctx := context.Background()
+	s := Scanner{}
+	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/engine/defaults/defaults.go

@@ -723,6 +723,7 @@ import (
 	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors/storychief"
 	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors/strava"
 	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors/streak"
+	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors/rancher"
 	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors/stripe"
 	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors/stripepaymentintent"
 	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors/stripo"
@@ -1612,7 +1613,8 @@ func buildDetectorList() []detectors.Detector {
 		&storychief.Scanner{},
 		&strava.Scanner{},
 		&streak.Scanner{},
-		&stripe.Scanner{},
+		&rancher.Scanner{},
+			&stripe.Scanner{},
 		&stripepaymentintent.Scanner{},
 		&stripo.Scanner{},
 		&stytch.Scanner{},