feat: disable cpe vendor wildcards to reduce false positives (#1647)

* improved parsing of vendor from github url

Signed-off-by: Weston Steimel <weston.steimel@anchore.com>

* stop generating wildcard vendors

Add logic for parsing javascript and ruby package vendor candidates from
url and author fields and stop generating wildcard vendor candidates

Signed-off-by: Weston Steimel <weston.steimel@anchore.com>

---------

Signed-off-by: Weston Steimel <weston.steimel@anchore.com>

syft/pkg/cataloger/common/cpe/generate.go

@@ -93,13 +93,6 @@ func candidateVendors(p pkg.Package) []string {
 		}
 	}
 
-	// some ecosystems do not have enough metadata to determine the vendor accurately, in which case we selectively
-	// allow * as a candidate. Note: do NOT allow Java packages to have * vendors.
-	switch p.Language {
-	case pkg.Ruby, pkg.JavaScript:
-		vendors.addValue(wfn.Any)
-	}
-
 	switch p.MetadataType {
 	case pkg.RpmMetadataType:
 		vendors.union(candidateVendorsForRPM(p))
@@ -111,8 +104,15 @@ func candidateVendors(p pkg.Package) []string {
 		vendors.union(candidateVendorsForJava(p))
 	case pkg.ApkMetadataType:
 		vendors.union(candidateVendorsForAPK(p))
+	case pkg.NpmPackageJSONMetadataType:
+		vendors.union(candidateVendorsForJavascript(p))
 	}
 
+	// We should no longer be generating vendor candidates with these values ["" and "*"]
+	// (since CPEs will match any other value)
+	vendors.removeByValue("")
+	vendors.removeByValue("*")
+
 	// try swapping hyphens for underscores, vice versa, and removing separators altogether
 	addDelimiterVariations(vendors)
 

syft/pkg/cataloger/common/cpe/generate_test.go

@@ -121,11 +121,16 @@ func TestGeneratePackageCPEs(t *testing.T) {
 				Version:      "3.2",
 				FoundBy:      "some-analyzer",
 				Language:     pkg.JavaScript,
-				Type:     pkg.DebPkg,
+				MetadataType: pkg.NpmPackageJSONMetadataType,
+				Metadata: pkg.NpmPackageJSONMetadata{
+					Author: "jon",
+					URL:    "https://github.com/bob/npm-name",
+				},
 			},
 			expected: []string{
 				"cpe:2.3:a:name:name:3.2:*:*:*:*:*:*:*",
-				"cpe:2.3:a:*:name:3.2:*:*:*:*:*:*:*",
+				"cpe:2.3:a:jon:name:3.2:*:*:*:*:*:*:*",
+				"cpe:2.3:a:bob:name:3.2:*:*:*:*:*:*:*",
 			},
 		},
 		{
@@ -142,10 +147,10 @@ func TestGeneratePackageCPEs(t *testing.T) {
 						"someones name",
 						"someones.elses.name@gmail.com",
 					},
+					Homepage: "https://github.com/tom/ruby-name",
 				},
 			},
 			expected: []string{
-				"cpe:2.3:a:*:name:3.2:*:*:*:*:*:*:*",
 				"cpe:2.3:a:name:name:3.2:*:*:*:*:*:*:*",
 				"cpe:2.3:a:ruby-lang:name:3.2:*:*:*:*:*:*:*",
 				"cpe:2.3:a:ruby:name:3.2:*:*:*:*:*:*:*",
@@ -154,6 +159,7 @@ func TestGeneratePackageCPEs(t *testing.T) {
 				"cpe:2.3:a:someones-name:name:3.2:*:*:*:*:*:*:*",
 				"cpe:2.3:a:someones_elses_name:name:3.2:*:*:*:*:*:*:*",
 				"cpe:2.3:a:someones_name:name:3.2:*:*:*:*:*:*:*",
+				"cpe:2.3:a:tom:name:3.2:*:*:*:*:*:*:*",
 			},
 		},
 		{
@@ -641,7 +647,6 @@ func TestGeneratePackageCPEs(t *testing.T) {
 				},
 			},
 			expected: []string{
-				"cpe:2.3:a:*:bundler:2.1.4:*:*:*:*:*:*:*",
 				"cpe:2.3:a:bundler:bundler:2.1.4:*:*:*:*:*:*:*",
 				"cpe:2.3:a:ruby-lang:bundler:2.1.4:*:*:*:*:*:*:*",
 				"cpe:2.3:a:ruby:bundler:2.1.4:*:*:*:*:*:*:*",

syft/pkg/cataloger/common/cpe/javascript.go

@@ -0,0 +1,32 @@
+package cpe
+
+import "github.com/anchore/syft/syft/pkg"
+
+func candidateVendorsForJavascript(p pkg.Package) fieldCandidateSet {
+	if p.MetadataType != pkg.NpmPackageJSONMetadataType {
+		return nil
+	}
+
+	vendors := newFieldCandidateSet()
+	metadata, ok := p.Metadata.(pkg.NpmPackageJSONMetadata)
+	if !ok {
+		return nil
+	}
+
+	if metadata.Author != "" {
+		vendors.add(fieldCandidate{
+			value:                 normalizePersonName(stripEmailSuffix(metadata.Author)),
+			disallowSubSelections: true,
+		})
+	}
+
+	if metadata.URL != "" {
+		vendors.union(candidateVendorsFromURL(metadata.URL))
+	}
+
+	if metadata.Homepage != "" {
+		vendors.union(candidateVendorsFromURL(metadata.Homepage))
+	}
+
+	return vendors
+}

syft/pkg/cataloger/common/cpe/ruby.go

@@ -17,5 +17,10 @@ func candidateVendorsForRuby(p pkg.Package) fieldCandidateSet {
 			disallowSubSelections: true,
 		})
 	}
+
+	if metadata.Homepage != "" {
+		vendors.union(candidateVendorsFromURL(metadata.Homepage))
+	}
+
 	return vendors
 }

syft/pkg/cataloger/common/cpe/vendors_from_url.go

@@ -21,7 +21,7 @@ var (
 	}
 
 	vendorExtractionPatterns = []*regexp.Regexp{
-		regexp.MustCompile(`^https://(?:github|gitlab)\.com/(?P<vendor>[\w\-]*?)/.*$`),
+		regexp.MustCompile(`^(?:https|http|git)://(?:github|gitlab)\.com/(?P<vendor>[\w\-]*?)/.*$`),
 	}
 )
 

syft/pkg/cataloger/common/cpe/vendors_from_url_test.go

@@ -52,6 +52,16 @@ func Test_candidateVendorsFromURL(t *testing.T) {
 			url:      "https://github.com/armadillo/abcxyz-12345/a/b/c/d/e/f/g",
 			expected: []string{"armadillo"},
 		},
+		{
+			name:     "github username from git://",
+			url:      "git://github.com/abc/xyz.git",
+			expected: []string{"abc"},
+		},
+		{
+			name:     "github username from http://",
+			url:      "http://github.com/abc/xyz.git",
+			expected: []string{"abc"},
+		},
 	}
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {