feat: nginx binary classifier (#1988)

Signed-off-by: SemProvoost <27961543+SemProvoost@users.noreply.github.com>

syft/pkg/cataloger/binary/cataloger_test.go

@@ -643,6 +643,30 @@ func Test_Cataloger_DefaultClassifiers_PositiveCases(t *testing.T) {
 				Metadata:  metadata("consul-binary"),
 			},
 		},
+		{
+			name:       "positive-nginx-1.25.1",
+			fixtureDir: "test-fixtures/classifiers/positive/nginx-1.25.1",
+			expected: pkg.Package{
+				Name:      "nginx",
+				Version:   "1.25.1",
+				Type:      "binary",
+				PURL:      "pkg:generic/nginx@1.25.1",
+				Locations: locations("nginx"),
+				Metadata:  metadata("nginx-binary"),
+			},
+		},
+		{
+			name:       "positive-nginx-openresty-1.21.4.2",
+			fixtureDir: "test-fixtures/classifiers/positive/nginx-openresty-1.21.4.2",
+			expected: pkg.Package{
+				Name:      "nginx",
+				Version:   "1.21.4",
+				Type:      "binary",
+				PURL:      "pkg:generic/nginx@1.21.4",
+				Locations: locations("nginx"),
+				Metadata:  metadata("nginx-binary"),
+			},
+		},
 	}
 
 	for _, test := range tests {

syft/pkg/cataloger/binary/default_classifiers.go

@@ -254,6 +254,21 @@ var defaultClassifiers = []classifier{
 		PURL:    mustPURL("pkg:golang/github.com/hashicorp/consul@version"),
 		CPEs:    singleCPE("cpe:2.3:a:hashicorp:consul:*:*:*:*:*:*:*:*"),
 	},
+	{
+		Class:    "nginx-binary",
+		FileGlob: "**/nginx",
+		EvidenceMatcher: fileContentsVersionMatcher(
+			// [NUL]nginx version: nginx/1.25.1 - fetches '1.25.1'
+			// [NUL]nginx version: openresty/1.21.4.1 - fetches '1.21.4' as this is the nginx version part
+			`(?m)(\x00|\?)nginx version: [^\/]+\/(?P<version>[0-9]+\.[0-9]+\.[0-9]+(?:\+\d+)?(?:-\d+)?)`,
+		),
+		Package: "nginx",
+		PURL:    mustPURL("pkg:generic/nginx@version"),
+		CPEs: []cpe.CPE{
+			cpe.Must("cpe:2.3:a:f5:nginx:*:*:*:*:*:*:*:*"),
+			cpe.Must("cpe:2.3:a:nginx:nginx:*:*:*:*:*:*:*:*"),
+		},
+	},
 }
 
 // in both binaries and shared libraries, the version pattern is [NUL]3.11.2[NUL]