feat(golang): add license parsing from vendor dirs (#3522)

Signed-off-by: Dominik Schmidt <dev@dominik-schmidt.de>
Signed-off-by: Keith Zantow <kzantow@gmail.com>
Co-authored-by: Keith Zantow <kzantow@gmail.com>

cmd/syft/internal/options/catalog.go

@@ -156,6 +156,8 @@ func (cfg Catalog) ToPackagesConfig() pkgcataloging.Config {
 		Golang: golang.DefaultCatalogerConfig().
 			WithSearchLocalModCacheLicenses(*multiLevelOption(false, enrichmentEnabled(cfg.Enrich, task.Go, task.Golang), cfg.Golang.SearchLocalModCacheLicenses)).
 			WithLocalModCacheDir(cfg.Golang.LocalModCacheDir).
+			WithSearchLocalVendorLicenses(*multiLevelOption(false, enrichmentEnabled(cfg.Enrich, task.Go, task.Golang), cfg.Golang.SearchLocalVendorLicenses)).
+			WithLocalVendorDir(cfg.Golang.LocalVendorDir).
 			WithSearchRemoteLicenses(*multiLevelOption(false, enrichmentEnabled(cfg.Enrich, task.Go, task.Golang), cfg.Golang.SearchRemoteLicenses)).
 			WithProxy(cfg.Golang.Proxy).
 			WithNoProxy(cfg.Golang.NoProxy).

cmd/syft/internal/options/golang.go

@@ -10,6 +10,8 @@ import (
 type golangConfig struct {
 	SearchLocalModCacheLicenses *bool                         `json:"search-local-mod-cache-licenses" yaml:"search-local-mod-cache-licenses" mapstructure:"search-local-mod-cache-licenses"`
 	LocalModCacheDir            string                        `json:"local-mod-cache-dir" yaml:"local-mod-cache-dir" mapstructure:"local-mod-cache-dir"`
+	SearchLocalVendorLicenses   *bool                         `json:"search-local-vendor-licenses" yaml:"search-local-vendor-licenses" mapstructure:"search-local-vendor-licenses"`
+	LocalVendorDir              string                        `json:"local-vendor-dir" yaml:"local-vendor-dir" mapstructure:"local-vendor-dir"`
 	SearchRemoteLicenses        *bool                         `json:"search-remote-licenses" yaml:"search-remote-licenses" mapstructure:"search-remote-licenses"`
 	Proxy                       string                        `json:"proxy" yaml:"proxy" mapstructure:"proxy"`
 	NoProxy                     string                        `json:"no-proxy" yaml:"no-proxy" mapstructure:"no-proxy"`
@@ -24,6 +26,9 @@ func (o *golangConfig) DescribeFields(descriptions clio.FieldDescriptionSet) {
 	descriptions.Add(&o.SearchLocalModCacheLicenses, `search for go package licences in the GOPATH of the system running Syft, note that this is outside the
 container filesystem and potentially outside the root of a local directory scan`)
 	descriptions.Add(&o.LocalModCacheDir, `specify an explicit go mod cache directory, if unset this defaults to $GOPATH/pkg/mod or $HOME/go/pkg/mod`)
+	descriptions.Add(&o.SearchLocalVendorLicenses, `search for go package licences in the vendor folder on the system running Syft, note that this is outside the
+container filesystem and potentially outside the root of a local directory scan`)
+	descriptions.Add(&o.LocalVendorDir, `specify an explicit go vendor directory, if unset this defaults to ./vendor`)
 	descriptions.Add(&o.SearchRemoteLicenses, `search for go package licences by retrieving the package from a network proxy`)
 	descriptions.Add(&o.Proxy, `remote proxy to use when retrieving go packages from the network,
 if unset this defaults to $GOPROXY followed by https://proxy.golang.org`)
@@ -49,6 +54,8 @@ func defaultGolangConfig() golangConfig {
 	return golangConfig{
 		SearchLocalModCacheLicenses: nil, // this defaults to false, which is the API default
 		LocalModCacheDir:            def.LocalModCacheDir,
+		SearchLocalVendorLicenses:   nil, // this defaults to false, which is the API default
+		LocalVendorDir:              def.LocalVendorDir,
 		SearchRemoteLicenses:        nil, // this defaults to false, which is the API default
 		Proxy:                       strings.Join(def.Proxies, ","),
 		NoProxy:                     strings.Join(def.NoProxy, ","),

syft/pkg/cataloger/golang/config.go

@@ -22,6 +22,8 @@ var (
 type CatalogerConfig struct {
 	SearchLocalModCacheLicenses bool                    `yaml:"search-local-mod-cache-licenses" json:"search-local-mod-cache-licenses" mapstructure:"search-local-mod-cache-licenses"`
 	LocalModCacheDir            string                  `yaml:"local-mod-cache-dir" json:"local-mod-cache-dir" mapstructure:"local-mod-cache-dir"`
+	SearchLocalVendorLicenses   bool                    `yaml:"search-local-vendor-licenses" json:"search-local-vendor-licenses" mapstructure:"search-local-vendor-licenses"`
+	LocalVendorDir              string                  `yaml:"local-vendor-dir" json:"local-vendor-dir" mapstructure:"local-vendor-dir"`
 	SearchRemoteLicenses        bool                    `yaml:"search-remote-licenses" json:"search-remote-licenses" mapstructure:"search-remote-licenses"`
 	Proxies                     []string                `yaml:"proxies,omitempty" json:"proxies,omitempty" mapstructure:"proxies"`
 	NoProxy                     []string                `yaml:"no-proxy,omitempty" json:"no-proxy,omitempty" mapstructure:"no-proxy"`
@@ -108,6 +110,19 @@ func (g CatalogerConfig) WithLocalModCacheDir(input string) CatalogerConfig {
 	return g
 }
 
+func (g CatalogerConfig) WithSearchLocalVendorLicenses(input bool) CatalogerConfig {
+	g.SearchLocalVendorLicenses = input
+	return g
+}
+
+func (g CatalogerConfig) WithLocalVendorDir(input string) CatalogerConfig {
+	if input == "" {
+		return g
+	}
+	g.LocalVendorDir = input
+	return g
+}
+
 func (g CatalogerConfig) WithSearchRemoteLicenses(input bool) CatalogerConfig {
 	g.SearchRemoteLicenses = input
 	return g

syft/pkg/cataloger/golang/config_test.go

@@ -10,11 +10,12 @@ import (
 
 func Test_Config(t *testing.T) {
 	type opts struct {
-		local    bool
+		local     bool
-		cacheDir string
+		cacheDir  string
-		remote   bool
+		vendorDir string
-		proxy    string
+		remote    bool
-		noProxy  string
+		proxy     string
+		noProxy   string
 	}
 
 	homedirCacheDisabled := homedir.DisableCache
@@ -45,10 +46,15 @@ func Test_Config(t *testing.T) {
 				"GOPRIVATE": "my.private",
 				"GONOPROXY": "no.proxy",
 			},
-			opts: opts{},
+			opts: opts{
+				// defaults to $cwd/vendor, we need to set it to make the output predictable
+				vendorDir: "/vendor",
+			},
 			expected: CatalogerConfig{
 				SearchLocalModCacheLicenses: false,
 				LocalModCacheDir:            filepath.Join("/go", "pkg", "mod"),
+				SearchLocalVendorLicenses:   false,
+				LocalVendorDir:              "/vendor",
 				SearchRemoteLicenses:        false,
 				Proxies:                     []string{"https://my.proxy"},
 				NoProxy:                     []string{"my.private", "no.proxy"},
@@ -64,15 +70,18 @@ func Test_Config(t *testing.T) {
 				"GONOPROXY": "no.proxy",
 			},
 			opts: opts{
-				local:    true,
+				local:     true,
-				cacheDir: "/go-cache",
+				cacheDir:  "/go-cache",
-				remote:   true,
+				vendorDir: "/vendor",
-				proxy:    "https://alt.proxy,direct",
+				remote:    true,
-				noProxy:  "alt.no.proxy",
+				proxy:     "https://alt.proxy,direct",
+				noProxy:   "alt.no.proxy",
 			},
 			expected: CatalogerConfig{
 				SearchLocalModCacheLicenses: true,
 				LocalModCacheDir:            "/go-cache",
+				SearchLocalVendorLicenses:   true,
+				LocalVendorDir:              "/vendor",
 				SearchRemoteLicenses:        true,
 				Proxies:                     []string{"https://alt.proxy", "direct"},
 				NoProxy:                     []string{"alt.no.proxy"},
@@ -92,6 +101,8 @@ func Test_Config(t *testing.T) {
 			got := DefaultCatalogerConfig().
 				WithSearchLocalModCacheLicenses(test.opts.local).
 				WithLocalModCacheDir(test.opts.cacheDir).
+				WithSearchLocalVendorLicenses(test.opts.local).
+				WithLocalVendorDir(test.opts.vendorDir).
 				WithSearchRemoteLicenses(test.opts.remote).
 				WithProxy(test.opts.proxy).
 				WithNoProxy(test.opts.noProxy)

syft/pkg/cataloger/golang/licenses.go

@@ -42,6 +42,7 @@ type goLicenseResolver struct {
 	catalogerName         string
 	opts                  CatalogerConfig
 	localModCacheDir      fs.FS
+	localVendorDir        fs.FS
 	licenseCache          cache.Resolver[[]goLicense]
 	lowerLicenseFileNames *strset.Set
 }
@@ -52,10 +53,25 @@ func newGoLicenseResolver(catalogerName string, opts CatalogerConfig) goLicenseR
 		localModCacheDir = os.DirFS(opts.LocalModCacheDir)
 	}
 
+	var localVendorDir fs.FS
+	if opts.SearchLocalVendorLicenses {
+		vendorDir := opts.LocalVendorDir
+		if vendorDir == "" {
+			wd, err := os.Getwd()
+			if err != nil {
+				log.Warn("unable to get CWD while resolving the local go vendor dir: %v", err)
+			} else {
+				vendorDir = filepath.Join(wd, "vendor")
+			}
+		}
+		localVendorDir = os.DirFS(vendorDir)
+	}
+
 	return goLicenseResolver{
 		catalogerName:         catalogerName,
 		opts:                  opts,
 		localModCacheDir:      localModCacheDir,
+		localVendorDir:        localVendorDir,
 		licenseCache:          cache.GetResolverCachingErrors[[]goLicense]("golang", "v1"),
 		lowerLicenseFileNames: strset.New(lowercaseLicenseFiles()...),
 	}
@@ -103,6 +119,17 @@ func (c *goLicenseResolver) getLicenses(ctx context.Context, scanner licenses.Sc
 		}
 	}
 
+	// look in the local vendor directory...
+	if c.opts.SearchLocalVendorLicenses {
+		goLicenses, err = c.getLicensesFromLocalVendor(ctx, scanner, moduleName)
+		if err != nil {
+			log.WithFields("error", err, "module", moduleName, "version", moduleVersion).Trace("unable to read golang licenses vendor")
+		}
+		if len(goLicenses) > 0 {
+			return toPkgLicenses(goLicenses)
+		}
+	}
+
 	// download from remote sources
 	if c.opts.SearchRemoteLicenses {
 		goLicenses, err = c.getLicensesFromRemote(ctx, scanner, moduleName, moduleVersion)
@@ -133,6 +160,25 @@ func (c *goLicenseResolver) getLicensesFromLocal(ctx context.Context, scanner li
 	return c.findLicensesInFS(ctx, scanner, "file://$GOPATH/pkg/mod/"+subdir+"/", dir)
 }
 
+func (c *goLicenseResolver) getLicensesFromLocalVendor(ctx context.Context, scanner licenses.Scanner, moduleName string) ([]goLicense, error) {
+	if c.localVendorDir == nil {
+		return nil, nil
+	}
+
+	subdir := processCaps(moduleName)
+
+	// get the local subdirectory containing the specific go module
+	dir, err := fs.Sub(c.localVendorDir, subdir)
+	if err != nil {
+		return nil, err
+	}
+
+	// if we're running against a directory on the filesystem, it may not include the
+	// user's homedir / GOPATH, so we defer to using the localModCacheResolver
+	// we use $GOPATH/pkg/mod to avoid leaking information about the user's system
+	return c.findLicensesInFS(ctx, scanner, "file://$GO_VENDOR/"+subdir+"/", dir)
+}
+
 func (c *goLicenseResolver) getLicensesFromRemote(ctx context.Context, scanner licenses.Scanner, moduleName, moduleVersion string) ([]goLicense, error) {
 	return c.licenseCache.Resolve(fmt.Sprintf("%s/%s", moduleName, moduleVersion), func() ([]goLicense, error) {
 		proxies := remotesForModule(c.opts.Proxies, c.opts.NoProxy, moduleName)

syft/pkg/cataloger/golang/licenses_test.go

@@ -68,6 +68,8 @@ func Test_LicenseSearch(t *testing.T) {
 	wd, err := os.Getwd()
 	require.NoError(t, err)
 
+	localVendorDir := filepath.Join(wd, "test-fixtures", "licenses-vendor")
+
 	licenseScanner := licenses.TestingOnlyScanner()
 
 	tests := []struct {
@@ -168,6 +170,51 @@ func Test_LicenseSearch(t *testing.T) {
 				Locations:      file.NewLocationSet(),
 			}},
 		},
+		{
+			name:    "github.com/someorg/somename",
+			version: "v0.3.2",
+			config: CatalogerConfig{
+				SearchLocalVendorLicenses: true,
+				LocalVendorDir:            localVendorDir,
+			},
+			expected: []pkg.License{{
+				Value:          "Apache-2.0",
+				SPDXExpression: "Apache-2.0",
+				Type:           license.Concluded,
+				URLs:           []string{"file://$GO_VENDOR/github.com/someorg/somename/LICENSE"},
+				Locations:      file.NewLocationSet(),
+			}},
+		},
+		{
+			name:    "github.com/CapORG/CapProject",
+			version: "v4.111.5",
+			config: CatalogerConfig{
+				SearchLocalVendorLicenses: true,
+				LocalVendorDir:            localVendorDir,
+			},
+			expected: []pkg.License{{
+				Value:          "MIT",
+				SPDXExpression: "MIT",
+				Type:           license.Concluded,
+				URLs:           []string{"file://$GO_VENDOR/github.com/!cap!o!r!g/!cap!project/LICENSE.txt"},
+				Locations:      file.NewLocationSet(),
+			}},
+		},
+		{
+			name:    "github.com/someorg/strangelicense",
+			version: "v1.2.3",
+			config: CatalogerConfig{
+				SearchLocalVendorLicenses: true,
+				LocalVendorDir:            localVendorDir,
+			},
+			expected: []pkg.License{{
+				Value:          "Apache-2.0",
+				SPDXExpression: "Apache-2.0",
+				Type:           license.Concluded,
+				URLs:           []string{"file://$GO_VENDOR/github.com/someorg/strangelicense/LiCeNsE.tXt"},
+				Locations:      file.NewLocationSet(),
+			}},
+		},
 	}
 
 	for _, test := range tests {

syft/pkg/cataloger/golang/test-fixtures/licenses-vendor/github.com/!cap!o!r!g/!cap!project/LICENSE.txt

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2014 Someone Cool <someone@cool.net.com.exe>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

syft/pkg/cataloger/golang/test-fixtures/licenses-vendor/github.com/someorg/somename/LICENSE

@@ -0,0 +1,201 @@
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+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
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+
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+      "Legal Entity" shall mean the union of the acting entity and all
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+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
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syft/pkg/cataloger/golang/test-fixtures/licenses-vendor/github.com/someorg/strangelicense/LiCeNsE.tXt

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
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+      "Source" form shall mean the preferred form for making modifications,
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