feat(sbom): Support license detection for SBOM scan

docs/docs/references/configuration/cli/trivy.md

@@ -53,7 +53,7 @@ trivy [global flags] command [flags] target
 * [trivy plugin](trivy_plugin.md)	 - Manage plugins
 * [trivy repository](trivy_repository.md)	 - Scan a repository
 * [trivy rootfs](trivy_rootfs.md)	 - Scan rootfs
-* [trivy sbom](trivy_sbom.md)	 - Scan SBOM for vulnerabilities
+* [trivy sbom](trivy_sbom.md)	 - Scan SBOM for vulnerabilities and licenses
 * [trivy server](trivy_server.md)	 - Server mode
 * [trivy version](trivy_version.md)	 - Print the version
 * [trivy vm](trivy_vm.md)	 - [EXPERIMENTAL] Scan a virtual machine image

docs/docs/references/configuration/cli/trivy_sbom.md

@@ -1,6 +1,6 @@
 ## trivy sbom
 
-Scan SBOM for vulnerabilities
+Scan SBOM for vulnerabilities and licenses
 
 ```
 trivy sbom [flags] SBOM_PATH
@@ -36,6 +36,7 @@ trivy sbom [flags] SBOM_PATH
       --ignore-policy string        specify the Rego file path to evaluate each vulnerability
       --ignore-status strings       comma-separated list of vulnerability status to ignore (unknown,not_affected,affected,fixed,under_investigation,will_not_fix,fix_deferred,end_of_life)
       --ignore-unfixed              display only fixed vulnerabilities
+      --ignored-licenses strings    specify a list of license to ignore
       --ignorefile string           specify .trivyignore file (default ".trivyignore")
       --java-db-repository string   OCI repository to retrieve trivy-java-db from (default "ghcr.io/aquasecurity/trivy-java-db:1")
       --list-all-pkgs               enabling the option will output all packages regardless of vulnerability
@@ -50,6 +51,7 @@ trivy sbom [flags] SBOM_PATH
       --rekor-url string            [EXPERIMENTAL] address of rekor STL server (default "https://rekor.sigstore.dev")
       --reset                       remove all caches and database
       --sbom-sources strings        [EXPERIMENTAL] try to retrieve SBOM from the specified sources (oci,rekor)
+      --scanners strings            comma-separated list of what security issues to detect (vuln,license) (default [vuln])
       --server string               server address in client mode
   -s, --severity strings            severities of security issues to be displayed (UNKNOWN,LOW,MEDIUM,HIGH,CRITICAL) (default [UNKNOWN,LOW,MEDIUM,HIGH,CRITICAL])
       --show-suppressed             [EXPERIMENTAL] show suppressed vulnerabilities

docs/docs/scanner/license.md

@@ -30,10 +30,10 @@ To configure the confidence level, you can use `--license-confidence-level`. Thi
 
 Currently, the standard license scanning doesn't support filesystem and repository scanning.
 
-|   License scanning    | Image | Rootfs | Filesystem | Repository |
-| :-------------------: | :---: | :----: | :--------: | :--------: |
-|       Standard        |   ✅   |   ✅    |     -      |     -      |
-| Full (--license-full) |   ✅   |   ✅    |     ✅      |     ✅      |
+|   License scanning    | Image | Rootfs | Filesystem | Repository | SBOM |
+|:---------------------:|:-----:|:------:|:----------:|:----------:|:----:|
+|       Standard        |   ✅   |   ✅    |     -      |     -      |  ✅   |
+| Full (--license-full) |   ✅   |   ✅    |     ✅      |     ✅      |  -   |
 
 License checking classifies the identified licenses and map the classification to severity.
 

docs/docs/target/sbom.md

@@ -1,6 +1,6 @@
 # SBOM scanning
 
-Trivy can take the following SBOM formats as an input and scan for vulnerabilities.
+Trivy can take the following SBOM formats as an input and scan for vulnerabilities and licenses.
 
 - CycloneDX
 - SPDX
@@ -17,6 +17,9 @@ $ trivy sbom /path/to/sbom_file
 
 ```
 
+By default, vulnerability scan in SBOM is executed. You can use `--scanners vuln,license` 
+command property to select also license scan, or `--scanners license` alone.
+
 !!! note
     Passing SBOMs generated by tool other than Trivy may result in inaccurate detection
     because Trivy relies on custom properties in SBOM for accurate scanning.

integration/sbom_test.go

@@ -6,11 +6,11 @@ import (
 	"path/filepath"
 	"testing"
 
+	ftypes "github.com/aquasecurity/trivy/pkg/fanal/types"
 	v1 "github.com/google/go-containerregistry/pkg/v1"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
-	ftypes "github.com/aquasecurity/trivy/pkg/fanal/types"
 	"github.com/aquasecurity/trivy/pkg/types"
 )
 
@@ -19,6 +19,7 @@ func TestSBOM(t *testing.T) {
 		input        string
 		format       string
 		artifactType string
+		scanners     string
 	}
 	tests := []struct {
 		name     string
@@ -150,13 +151,28 @@ func TestSBOM(t *testing.T) {
 				},
 			},
 		},
+		{
+			name: "license check cyclonedx json",
+			args: args{
+				input:        "testdata/fixtures/sbom/license-cyclonedx.json",
+				format:       "json",
+				artifactType: "cyclonedx",
+				scanners:     "license",
+			},
+			golden: "testdata/license-cyclonedx.json.golden",
+		},
 	}
 
 	// Set up testing DB
 	cacheDir := initDB(t)
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
+			scanners := "vuln"
+			if tt.args.scanners != "" {
+				scanners = tt.args.scanners
+			}
+
 			osArgs := []string{
 				"--cache-dir",
 				cacheDir,
@@ -165,6 +181,8 @@ func TestSBOM(t *testing.T) {
 				"--skip-db-update",
 				"--format",
 				tt.args.format,
+				"--scanners",
+				scanners,
 			}
 
 			// Set up the output file
@@ -223,5 +241,10 @@ func compareSBOMReports(t *testing.T, wantFile, gotFile string, overrideWant typ
 	}
 
 	got := readReport(t, gotFile)
+	// when running on Windows FS
+	got.ArtifactName = filepath.ToSlash(filepath.Clean(got.ArtifactName))
+	for i, result := range got.Results {
+		got.Results[i].Target = filepath.ToSlash(filepath.Clean(result.Target))
+	}
 	assert.Equal(t, want, got)
 }

integration/testdata/fixtures/sbom/license-cyclonedx.json

@@ -0,0 +1,125 @@
+{
+  "$schema": "http://cyclonedx.org/schema/bom-1.5.schema.json",
+  "bomFormat": "CycloneDX",
+  "specVersion": "1.5",
+  "serialNumber": "urn:uuid:c09512e3-47e7-4eff-8f76-5d7ae72b26a5",
+  "version": 1,
+  "metadata": {
+    "timestamp": "2024-03-10T14:57:31+00:00",
+    "tools": {
+      "components": [
+        {
+          "type": "application",
+          "group": "aquasecurity",
+          "name": "trivy",
+          "version": "dev"
+        }
+      ]
+    },
+    "component": {
+      "bom-ref": "acc9d4aa-4158-4969-a497-637e114fde0c",
+      "type": "application",
+      "name": "C:/Users/bedla.czech/IdeaProjects/sbom-demo",
+      "properties": [
+        {
+          "name": "aquasecurity:trivy:SchemaVersion",
+          "value": "2"
+        }
+      ]
+    }
+  },
+  "components": [
+    {
+      "bom-ref": "eb56cd49-da98-4b08-bfc8-9880fb063cf1",
+      "type": "application",
+      "name": "pom.xml",
+      "properties": [
+        {
+          "name": "aquasecurity:trivy:Class",
+          "value": "lang-pkgs"
+        },
+        {
+          "name": "aquasecurity:trivy:Type",
+          "value": "pom"
+        }
+      ]
+    },
+    {
+      "bom-ref": "pkg:maven/org.eclipse.sisu/org.eclipse.sisu.plexus@0.3.0.M1",
+      "type": "library",
+      "group": "org.eclipse.sisu",
+      "name": "org.eclipse.sisu.plexus",
+      "version": "0.3.0.M1",
+      "licenses": [
+        {
+          "license": {
+            "name": "EPL-1.0"
+          }
+        }
+      ],
+      "purl": "pkg:maven/org.eclipse.sisu/org.eclipse.sisu.plexus@0.3.0.M1",
+      "properties": [
+        {
+          "name": "aquasecurity:trivy:PkgID",
+          "value": "org.eclipse.sisu:org.eclipse.sisu.plexus:0.3.0.M1"
+        },
+        {
+          "name": "aquasecurity:trivy:PkgType",
+          "value": "pom"
+        }
+      ]
+    },
+    {
+      "bom-ref": "pkg:maven/org.ow2.asm/asm@9.5",
+      "type": "library",
+      "group": "org.ow2.asm",
+      "name": "asm",
+      "version": "9.5",
+      "licenses": [
+        {
+          "license": {
+            "name": "BSD-3-Clause"
+          }
+        }
+      ],
+      "purl": "pkg:maven/org.ow2.asm/asm@9.5",
+      "properties": [
+        {
+          "name": "aquasecurity:trivy:PkgID",
+          "value": "org.ow2.asm:asm:9.5"
+        },
+        {
+          "name": "aquasecurity:trivy:PkgType",
+          "value": "pom"
+        }
+      ]
+    },
+    {
+      "bom-ref": "pkg:maven/org.slf4j/slf4j-api@2.0.11",
+      "type": "library",
+      "group": "org.slf4j",
+      "name": "slf4j-api",
+      "version": "2.0.11",
+      "licenses": [
+        {
+          "license": {
+            "name": "MIT License"
+          }
+        }
+      ],
+      "purl": "pkg:maven/org.slf4j/slf4j-api@2.0.11",
+      "properties": [
+        {
+          "name": "aquasecurity:trivy:PkgID",
+          "value": "org.slf4j:slf4j-api:2.0.11"
+        },
+        {
+          "name": "aquasecurity:trivy:PkgType",
+          "value": "pom"
+        }
+      ]
+    }
+  ],
+  "dependencies": [],
+  "vulnerabilities": []
+}

integration/testdata/license-cyclonedx.json.golden

@@ -0,0 +1,65 @@
+{
+  "SchemaVersion": 2,
+  "CreatedAt": "2021-08-25T12:20:30.000000005Z",
+  "ArtifactName": "testdata/fixtures/sbom/license-cyclonedx.json",
+  "ArtifactType": "cyclonedx",
+  "Metadata": {
+    "ImageConfig": {
+      "architecture": "",
+      "created": "0001-01-01T00:00:00Z",
+      "os": "",
+      "rootfs": {
+        "type": "",
+        "diff_ids": null
+      },
+      "config": {}
+    }
+  },
+  "Results": [
+    {
+      "Target": "OS Packages",
+      "Class": "license"
+    },
+    {
+      "Target": "pom.xml",
+      "Class": "license"
+    },
+    {
+      "Target": "Java",
+      "Class": "license",
+      "Licenses": [
+        {
+          "Severity": "MEDIUM",
+          "Category": "reciprocal",
+          "PkgName": "org.eclipse.sisu:org.eclipse.sisu.plexus",
+          "FilePath": "",
+          "Name": "EPL-1.0",
+          "Confidence": 1,
+          "Link": ""
+        },
+        {
+          "Severity": "LOW",
+          "Category": "notice",
+          "PkgName": "org.ow2.asm:asm",
+          "FilePath": "",
+          "Name": "BSD-3-Clause",
+          "Confidence": 1,
+          "Link": ""
+        },
+        {
+          "Severity": "UNKNOWN",
+          "Category": "unknown",
+          "PkgName": "org.slf4j:slf4j-api",
+          "FilePath": "",
+          "Name": "MIT License",
+          "Confidence": 1,
+          "Link": ""
+        }
+      ]
+    },
+    {
+      "Target": "Loose File License(s)",
+      "Class": "license-file"
+    }
+  ]
+}

pkg/commands/app.go

@@ -1125,11 +1125,24 @@ func NewSBOMCommand(globalFlags *flag.GlobalFlagGroup) *cobra.Command {
 	reportFlagGroup.DependencyTree = nil // disable '--dependency-tree'
 	reportFlagGroup.ReportFormat = nil   // TODO: support --report summary
 
+	scanners := flag.ScannersFlag.Clone()
+	scanners.Values = xstrings.ToStringSlice(types.Scanners{
+		types.VulnerabilityScanner,
+		types.LicenseScanner,
+	})
+	scanners.Default = xstrings.ToStringSlice(types.Scanners{
+		types.VulnerabilityScanner,
+	})
 	scanFlagGroup := flag.NewScanFlagGroup()
-	scanFlagGroup.Scanners = nil       // disable '--scanners' as it always scans for vulnerabilities
+	scanFlagGroup.Scanners = scanners  // allow only 'vuln' and 'license' options for '--scanners'
 	scanFlagGroup.IncludeDevDeps = nil // disable '--include-dev-deps'
 	scanFlagGroup.Parallel = nil       // disable '--parallel'
 
+	licenseFlagGroup := flag.NewLicenseFlagGroup()
+	// License full-scan and confidence-level are for file content only
+	licenseFlagGroup.LicenseFull = nil
+	licenseFlagGroup.LicenseConfidenceLevel = nil
+
 	sbomFlags := &flag.Flags{
 		GlobalFlagGroup:        globalFlags,
 		CacheFlagGroup:         flag.NewCacheFlagGroup(),
@@ -1139,11 +1152,12 @@ func NewSBOMCommand(globalFlags *flag.GlobalFlagGroup) *cobra.Command {
 		ScanFlagGroup:          scanFlagGroup,
 		SBOMFlagGroup:          flag.NewSBOMFlagGroup(),
 		VulnerabilityFlagGroup: flag.NewVulnerabilityFlagGroup(),
+		LicenseFlagGroup:       licenseFlagGroup,
 	}
 
 	cmd := &cobra.Command{
 		Use:     "sbom [flags] SBOM_PATH",
-		Short:   "Scan SBOM for vulnerabilities",
+		Short:   "Scan SBOM for vulnerabilities and licenses",
 		GroupID: groupScanning,
 		Example: `  # Scan CycloneDX and show the result in tables
   $ trivy sbom /path/to/report.cdx
@@ -1166,9 +1180,6 @@ func NewSBOMCommand(globalFlags *flag.GlobalFlagGroup) *cobra.Command {
 				return xerrors.Errorf("flag error: %w", err)
 			}
 
-			// Scan vulnerabilities
-			options.Scanners = types.Scanners{types.VulnerabilityScanner}
-
 			return artifact.Run(cmd.Context(), options, artifact.TargetSBOM)
 		},
 		SilenceErrors: true,