Add support for #excluding specific rules

analyzer.go

@@ -25,6 +25,7 @@ import (
 	"os"
 	"path"
 	"reflect"
+	"regexp"
 	"strings"
 
 	"path/filepath"
@@ -43,6 +44,7 @@ type Context struct {
 	Root     *ast.File
 	Config   map[string]interface{}
 	Imports  *ImportTracker
+	Ignores  []map[string]bool
 }
 
 // Metrics used when reporting information about a scanning run.
@@ -87,9 +89,9 @@ func NewAnalyzer(conf Config, logger *log.Logger) *Analyzer {
 
 // LoadRules instantiates all the rules to be used when analyzing source
 // packages
-func (gas *Analyzer) LoadRules(ruleDefinitions ...RuleBuilder) {
+func (gas *Analyzer) LoadRules(ruleDefinitions map[string]RuleBuilder) {
-	for _, builder := range ruleDefinitions {
+	for id, def := range ruleDefinitions {
-		r, nodes := builder(gas.config)
+		r, nodes := def(id, gas.config)
 		gas.ruleset.Register(r, nodes...)
 	}
 }
@@ -147,41 +149,84 @@ func (gas *Analyzer) Process(packagePaths ...string) error {
 }
 
 // ignore a node (and sub-tree) if it is tagged with a "#nosec" comment
-func (gas *Analyzer) ignore(n ast.Node) bool {
+func (gas *Analyzer) ignore(n ast.Node) ([]string, bool) {
 	if groups, ok := gas.context.Comments[n]; ok && !gas.ignoreNosec {
 		for _, group := range groups {
 			if strings.Contains(group.Text(), "#nosec") {
 				gas.stats.NumNosec++
-				return true
+				return nil, true
+			}
+
+			if strings.Contains(group.Text(), "#exclude") {
+				gas.stats.NumNosec++
+
+				// Pull out the specific rules that are listed to be ignored.
+				re := regexp.MustCompile("!(G\\d{3})")
+				matches := re.FindAllStringSubmatch(group.Text(), -1)
+
+				// Find the rule IDs to ignore.
+				ignores := make([]string, 0)
+				for _, v := range matches {
+					ignores = append(ignores, v[1])
+				}
+				return ignores, false
 			}
 		}
 	}
-	return false
+	return nil, false
 }
 
 // Visit runs the GAS visitor logic over an AST created by parsing go code.
 // Rule methods added with AddRule will be invoked as necessary.
 func (gas *Analyzer) Visit(n ast.Node) ast.Visitor {
-	if !gas.ignore(n) {
+	// If we've reached the end of this branch, pop off the ignores stack.
-
+	if n == nil {
-		// Track aliased and initialization imports
+		if len(gas.context.Ignores) > 0 {
-		gas.context.Imports.TrackImport(n)
+			gas.context.Ignores = gas.context.Ignores[1:]
-
-		for _, rule := range gas.ruleset.RegisteredFor(n) {
-			issue, err := rule.Match(n, gas.context)
-			if err != nil {
-				file, line := GetLocation(n, gas.context)
-				file = path.Base(file)
-				gas.logger.Printf("Rule error: %v => %s (%s:%d)\n", reflect.TypeOf(rule), err, file, line)
-			}
-			if issue != nil {
-				gas.issues = append(gas.issues, issue)
-				gas.stats.NumFound++
-			}
 		}
 		return gas
 	}
-	return nil
+
+	// Get any new rule exclusions.
+	ignoredRules, ignoreAll := gas.ignore(n)
+	if ignoreAll {
+		return nil
+	}
+
+	// Now create the union of exclusions.
+	ignores := make(map[string]bool, 0)
+	if len(gas.context.Ignores) > 0 {
+		for k, v := range gas.context.Ignores[0] {
+			ignores[k] = v
+		}
+	}
+
+	for _, v := range ignoredRules {
+		ignores[v] = true
+	}
+
+	// Push the new set onto the stack.
+	gas.context.Ignores = append([]map[string]bool{ignores}, gas.context.Ignores...)
+
+	// Track aliased and initialization imports
+	gas.context.Imports.TrackImport(n)
+
+	for _, rule := range gas.ruleset.RegisteredFor(n) {
+		if _, ok := ignores[rule.ID()]; ok {
+			continue
+		}
+		issue, err := rule.Match(n, gas.context)
+		if err != nil {
+			file, line := GetLocation(n, gas.context)
+			file = path.Base(file)
+			gas.logger.Printf("Rule error: %v => %s (%s:%d)\n", reflect.TypeOf(rule), err, file, line)
+		}
+		if issue != nil {
+			gas.issues = append(gas.issues, issue)
+			gas.stats.NumFound++
+		}
+	}
+	return gas
 }
 
 // Report returns the current issues discovered and the metrics about the scan

analyzer_test.go

@@ -28,7 +28,7 @@ var _ = Describe("Analyzer", func() {
 	Context("when processing a package", func() {
 
 		It("should return an error if the package contains no Go files", func() {
-			analyzer.LoadRules(rules.Generate().Builders()...)
+			analyzer.LoadRules(rules.Generate().Builders())
 			dir, err := ioutil.TempDir("", "empty")
 			defer os.RemoveAll(dir)
 			Expect(err).ShouldNot(HaveOccurred())
@@ -38,7 +38,7 @@ var _ = Describe("Analyzer", func() {
 		})
 
 		It("should return an error if the package fails to build", func() {
-			analyzer.LoadRules(rules.Generate().Builders()...)
+			analyzer.LoadRules(rules.Generate().Builders())
 			pkg := testutils.NewTestPackage()
 			defer pkg.Close()
 			pkg.AddFile("wonky.go", `func main(){ println("forgot the package")}`)
@@ -51,7 +51,7 @@ var _ = Describe("Analyzer", func() {
 		})
 
 		It("should be able to analyze mulitple Go files", func() {
-			analyzer.LoadRules(rules.Generate().Builders()...)
+			analyzer.LoadRules(rules.Generate().Builders())
 			pkg := testutils.NewTestPackage()
 			defer pkg.Close()
 			pkg.AddFile("foo.go", `
@@ -72,7 +72,7 @@ var _ = Describe("Analyzer", func() {
 		})
 
 		It("should be able to analyze mulitple Go packages", func() {
-			analyzer.LoadRules(rules.Generate().Builders()...)
+			analyzer.LoadRules(rules.Generate().Builders())
 			pkg1 := testutils.NewTestPackage()
 			pkg2 := testutils.NewTestPackage()
 			defer pkg1.Close()
@@ -98,7 +98,7 @@ var _ = Describe("Analyzer", func() {
 			// Rule for MD5 weak crypto usage
 			sample := testutils.SampleCodeG401[0]
 			source := sample.Code
-			analyzer.LoadRules(rules.Generate(rules.NewRuleFilter(false, "G401")).Builders()...)
+			analyzer.LoadRules(rules.Generate(rules.NewRuleFilter(false, "G401")).Builders())
 
 			controlPackage := testutils.NewTestPackage()
 			defer controlPackage.Close()
@@ -114,7 +114,7 @@ var _ = Describe("Analyzer", func() {
 			// Rule for MD5 weak crypto usage
 			sample := testutils.SampleCodeG401[0]
 			source := sample.Code
-			analyzer.LoadRules(rules.Generate(rules.NewRuleFilter(false, "G401")).Builders()...)
+			analyzer.LoadRules(rules.Generate(rules.NewRuleFilter(false, "G401")).Builders())
 
 			nosecPackage := testutils.NewTestPackage()
 			defer nosecPackage.Close()
@@ -126,6 +126,57 @@ var _ = Describe("Analyzer", func() {
 			nosecIssues, _ := analyzer.Report()
 			Expect(nosecIssues).Should(BeEmpty())
 		})
+
+		It("should not report errors when an exclude comment is present for the correct rule", func() {
+			// Rule for MD5 weak crypto usage
+			sample := testutils.SampleCodeG401[0]
+			source := sample.Code
+			analyzer.LoadRules(rules.Generate(rules.NewRuleFilter(false, "G401")).Builders())
+
+			nosecPackage := testutils.NewTestPackage()
+			defer nosecPackage.Close()
+			nosecSource := strings.Replace(source, "h := md5.New()", "h := md5.New() // #exclude !G401", 1)
+			nosecPackage.AddFile("md5.go", nosecSource)
+			nosecPackage.Build()
+
+			analyzer.Process(nosecPackage.Path)
+			nosecIssues, _ := analyzer.Report()
+			Expect(nosecIssues).Should(BeEmpty())
+		})
+
+		It("should report errors when an exclude comment is present for a different rule", func() {
+			// Rule for MD5 weak crypto usage
+			sample := testutils.SampleCodeG401[0]
+			source := sample.Code
+			analyzer.LoadRules(rules.Generate(rules.NewRuleFilter(false, "G401")).Builders())
+
+			nosecPackage := testutils.NewTestPackage()
+			defer nosecPackage.Close()
+			nosecSource := strings.Replace(source, "h := md5.New()", "h := md5.New() // #exclude !G301", 1)
+			nosecPackage.AddFile("md5.go", nosecSource)
+			nosecPackage.Build()
+
+			analyzer.Process(nosecPackage.Path)
+			nosecIssues, _ := analyzer.Report()
+			Expect(nosecIssues).Should(HaveLen(sample.Errors))
+		})
+
+		It("should not report errors when an exclude comment is present for multiple rules, including the correct rule", func() {
+			// Rule for MD5 weak crypto usage
+			sample := testutils.SampleCodeG401[0]
+			source := sample.Code
+			analyzer.LoadRules(rules.Generate(rules.NewRuleFilter(false, "G401")).Builders())
+
+			nosecPackage := testutils.NewTestPackage()
+			defer nosecPackage.Close()
+			nosecSource := strings.Replace(source, "h := md5.New()", "h := md5.New() // #exclude !G301 !G401", 1)
+			nosecPackage.AddFile("md5.go", nosecSource)
+			nosecPackage.Build()
+
+			analyzer.Process(nosecPackage.Path)
+			nosecIssues, _ := analyzer.Report()
+			Expect(nosecIssues).Should(BeEmpty())
+		})
 	})
 
 	It("should be possible to overwrite nosec comments, and report issues", func() {
@@ -138,7 +189,7 @@ var _ = Describe("Analyzer", func() {
 		nosecIgnoreConfig := gas.NewConfig()
 		nosecIgnoreConfig.SetGlobal("nosec", "true")
 		customAnalyzer := gas.NewAnalyzer(nosecIgnoreConfig, logger)
-		customAnalyzer.LoadRules(rules.Generate(rules.NewRuleFilter(false, "G401")).Builders()...)
+		customAnalyzer.LoadRules(rules.Generate(rules.NewRuleFilter(false, "G401")).Builders())
 
 		nosecPackage := testutils.NewTestPackage()
 		defer nosecPackage.Close()

cmd/gas/main.go

@@ -206,7 +206,7 @@ func main() {
 
 	// Create the analyzer
 	analyzer := gas.NewAnalyzer(config, logger)
-	analyzer.LoadRules(ruleDefinitions.Builders()...)
+	analyzer.LoadRules(ruleDefinitions.Builders())
 
 	vendor := regexp.MustCompile(`[\\/]vendor([\\/]|$)`)
 

issue.go

@@ -47,6 +47,7 @@ type Issue struct {
 // MetaData is embedded in all GAS rules. The Severity, Confidence and What message
 // will be passed tbhrough to reported issues.
 type MetaData struct {
+	ID         string
 	Severity   Score
 	Confidence Score
 	What       string

issue_test.go

@@ -78,7 +78,7 @@ var _ = Describe("Issue", func() {
 
 			// Use SQL rule to check binary expr
 			cfg := gas.NewConfig()
-			rule, _ := rules.NewSQLStrConcat(cfg)
+			rule, _ := rules.NewSQLStrConcat("TEST", cfg)
 			issue, err := rule.Match(target, ctx)
 			Expect(err).ShouldNot(HaveOccurred())
 			Expect(issue).ShouldNot(BeNil())

rule.go

@@ -19,11 +19,12 @@ import (
 
 // The Rule interface used by all rules supported by GAS.
 type Rule interface {
+	ID() string
 	Match(ast.Node, *Context) (*Issue, error)
 }
 
 // RuleBuilder is used to register a rule definition with the analyzer
-type RuleBuilder func(c Config) (Rule, []ast.Node)
+type RuleBuilder func(id string, c Config) (Rule, []ast.Node)
 
 // A RuleSet maps lists of rules to the type of AST node they should be run on.
 // The anaylzer will only invoke rules contained in the list associated with the

rule_test.go

@@ -15,6 +15,10 @@ type mockrule struct {
 	callback func(n ast.Node, ctx *gas.Context) bool
 }
 
+func (m *mockrule) ID() string {
+	return "MOCK"
+}
+
 func (m *mockrule) Match(n ast.Node, ctx *gas.Context) (*gas.Issue, error) {
 	if m.callback(n, ctx) {
 		return m.issue, nil

rules/big.go

@@ -26,6 +26,10 @@ type usingBigExp struct {
 	calls []string
 }
 
+func (r *usingBigExp) ID() string {
+	return r.MetaData.ID
+}
+
 func (r *usingBigExp) Match(n ast.Node, c *gas.Context) (gi *gas.Issue, err error) {
 	if _, matched := gas.MatchCallByType(n, c, r.pkg, r.calls...); matched {
 		return gas.NewIssue(c, n, r.What, r.Severity, r.Confidence), nil
@@ -34,11 +38,12 @@ func (r *usingBigExp) Match(n ast.Node, c *gas.Context) (gi *gas.Issue, err erro
 }
 
 // NewUsingBigExp detects issues with modulus == 0 for Bignum
-func NewUsingBigExp(conf gas.Config) (gas.Rule, []ast.Node) {
+func NewUsingBigExp(id string, conf gas.Config) (gas.Rule, []ast.Node) {
 	return &usingBigExp{
 		pkg:   "*math/big.Int",
 		calls: []string{"Exp"},
 		MetaData: gas.MetaData{
+			ID:         id,
 			What:       "Use of math/big.Int.Exp function should be audited for modulus == 0",
 			Severity:   gas.Low,
 			Confidence: gas.High,

rules/bind.go

@@ -28,6 +28,10 @@ type bindsToAllNetworkInterfaces struct {
 	pattern *regexp.Regexp
 }
 
+func (r *bindsToAllNetworkInterfaces) ID() string {
+	return r.MetaData.ID
+}
+
 func (r *bindsToAllNetworkInterfaces) Match(n ast.Node, c *gas.Context) (*gas.Issue, error) {
 	callExpr := r.calls.ContainsCallExpr(n, c)
 	if callExpr == nil {
@@ -43,7 +47,7 @@ func (r *bindsToAllNetworkInterfaces) Match(n ast.Node, c *gas.Context) (*gas.Is
 
 // NewBindsToAllNetworkInterfaces detects socket connections that are setup to
 // listen on all network interfaces.
-func NewBindsToAllNetworkInterfaces(conf gas.Config) (gas.Rule, []ast.Node) {
+func NewBindsToAllNetworkInterfaces(id string, conf gas.Config) (gas.Rule, []ast.Node) {
 	calls := gas.NewCallList()
 	calls.Add("net", "Listen")
 	calls.Add("crypto/tls", "Listen")
@@ -51,6 +55,7 @@ func NewBindsToAllNetworkInterfaces(conf gas.Config) (gas.Rule, []ast.Node) {
 		calls:   calls,
 		pattern: regexp.MustCompile(`^(0.0.0.0|:).*$`),
 		MetaData: gas.MetaData{
+			ID:         id,
 			Severity:   gas.Medium,
 			Confidence: gas.High,
 			What:       "Binds to all network interfaces",

rules/blacklist.go

@@ -32,6 +32,10 @@ func unquote(original string) string {
 	return strings.TrimRight(copy, `"`)
 }
 
+func (r *blacklistedImport) ID() string {
+	return r.MetaData.ID
+}
+
 func (r *blacklistedImport) Match(n ast.Node, c *gas.Context) (*gas.Issue, error) {
 	if node, ok := n.(*ast.ImportSpec); ok {
 		if description, ok := r.Blacklisted[unquote(node.Path.Value)]; ok {
@@ -43,9 +47,10 @@ func (r *blacklistedImport) Match(n ast.Node, c *gas.Context) (*gas.Issue, error
 
 // NewBlacklistedImports reports when a blacklisted import is being used.
 // Typically when a deprecated technology is being used.
-func NewBlacklistedImports(conf gas.Config, blacklist map[string]string) (gas.Rule, []ast.Node) {
+func NewBlacklistedImports(id string, conf gas.Config, blacklist map[string]string) (gas.Rule, []ast.Node) {
 	return &blacklistedImport{
 		MetaData: gas.MetaData{
+			ID:         id,
 			Severity:   gas.Medium,
 			Confidence: gas.High,
 		},
@@ -54,29 +59,29 @@ func NewBlacklistedImports(conf gas.Config, blacklist map[string]string) (gas.Ru
 }
 
 // NewBlacklistedImportMD5 fails if MD5 is imported
-func NewBlacklistedImportMD5(conf gas.Config) (gas.Rule, []ast.Node) {
+func NewBlacklistedImportMD5(id string, conf gas.Config) (gas.Rule, []ast.Node) {
-	return NewBlacklistedImports(conf, map[string]string{
+	return NewBlacklistedImports(id, conf, map[string]string{
 		"crypto/md5": "Blacklisted import crypto/md5: weak cryptographic primitive",
 	})
 }
 
 // NewBlacklistedImportDES fails if DES is imported
-func NewBlacklistedImportDES(conf gas.Config) (gas.Rule, []ast.Node) {
+func NewBlacklistedImportDES(id string, conf gas.Config) (gas.Rule, []ast.Node) {
-	return NewBlacklistedImports(conf, map[string]string{
+	return NewBlacklistedImports(id, conf, map[string]string{
 		"crypto/des": "Blacklisted import crypto/des: weak cryptographic primitive",
 	})
 }
 
 // NewBlacklistedImportRC4 fails if DES is imported
-func NewBlacklistedImportRC4(conf gas.Config) (gas.Rule, []ast.Node) {
+func NewBlacklistedImportRC4(id string, conf gas.Config) (gas.Rule, []ast.Node) {
-	return NewBlacklistedImports(conf, map[string]string{
+	return NewBlacklistedImports(id, conf, map[string]string{
 		"crypto/rc4": "Blacklisted import crypto/rc4: weak cryptographic primitive",
 	})
 }
 
 // NewBlacklistedImportCGI fails if CGI is imported
-func NewBlacklistedImportCGI(conf gas.Config) (gas.Rule, []ast.Node) {
+func NewBlacklistedImportCGI(id string, conf gas.Config) (gas.Rule, []ast.Node) {
-	return NewBlacklistedImports(conf, map[string]string{
+	return NewBlacklistedImports(id, conf, map[string]string{
 		"net/http/cgi": "Blacklisted import net/http/cgi: Go versions < 1.6.3 are vulnerable to Httpoxy attack: (CVE-2016-5386)",
 	})
 }

rules/errors.go

@@ -26,6 +26,10 @@ type noErrorCheck struct {
 	whitelist gas.CallList
 }
 
+func (r *noErrorCheck) ID() string {
+	return r.MetaData.ID
+}
+
 func returnsError(callExpr *ast.CallExpr, ctx *gas.Context) int {
 	if tv := ctx.Info.TypeOf(callExpr); tv != nil {
 		switch t := tv.(type) {
@@ -71,8 +75,7 @@ func (r *noErrorCheck) Match(n ast.Node, ctx *gas.Context) (*gas.Issue, error) {
 }
 
 // NewNoErrorCheck detects if the returned error is unchecked
-func NewNoErrorCheck(conf gas.Config) (gas.Rule, []ast.Node) {
+func NewNoErrorCheck(id string, conf gas.Config) (gas.Rule, []ast.Node) {
-
 	// TODO(gm) Come up with sensible defaults here. Or flip it to use a
 	// black list instead.
 	whitelist := gas.NewCallList()
@@ -89,6 +92,7 @@ func NewNoErrorCheck(conf gas.Config) (gas.Rule, []ast.Node) {
 	}
 	return &noErrorCheck{
 		MetaData: gas.MetaData{
+			ID:         id,
 			Severity:   gas.Low,
 			Confidence: gas.High,
 			What:       "Errors unhandled.",

rules/fileperms.go

@@ -29,6 +29,10 @@ type filePermissions struct {
 	calls []string
 }
 
+func (r *filePermissions) ID() string {
+	return r.MetaData.ID
+}
+
 func getConfiguredMode(conf map[string]interface{}, configKey string, defaultMode int64) int64 {
 	var mode = defaultMode
 	if value, ok := conf[configKey]; ok {
@@ -58,13 +62,14 @@ func (r *filePermissions) Match(n ast.Node, c *gas.Context) (*gas.Issue, error)
 
 // NewFilePerms creates a rule to detect file creation with a more permissive than configured
 // permission mask.
-func NewFilePerms(conf gas.Config) (gas.Rule, []ast.Node) {
+func NewFilePerms(id string, conf gas.Config) (gas.Rule, []ast.Node) {
 	mode := getConfiguredMode(conf, "G302", 0600)
 	return &filePermissions{
 		mode:  mode,
 		pkg:   "os",
 		calls: []string{"OpenFile", "Chmod"},
 		MetaData: gas.MetaData{
+			ID:         id,
 			Severity:   gas.Medium,
 			Confidence: gas.High,
 			What:       fmt.Sprintf("Expect file permissions to be %#o or less", mode),
@@ -74,13 +79,14 @@ func NewFilePerms(conf gas.Config) (gas.Rule, []ast.Node) {
 
 // NewMkdirPerms creates a rule to detect directory creation with more permissive than
 // configured permission mask.
-func NewMkdirPerms(conf gas.Config) (gas.Rule, []ast.Node) {
+func NewMkdirPerms(id string, conf gas.Config) (gas.Rule, []ast.Node) {
 	mode := getConfiguredMode(conf, "G301", 0750)
 	return &filePermissions{
 		mode:  mode,
 		pkg:   "os",
 		calls: []string{"Mkdir", "MkdirAll"},
 		MetaData: gas.MetaData{
+			ID:         id,
 			Severity:   gas.Medium,
 			Confidence: gas.High,
 			What:       fmt.Sprintf("Expect directory permissions to be %#o or less", mode),

rules/hardcoded_credentials.go

@@ -33,6 +33,10 @@ type credentials struct {
 	ignoreEntropy    bool
 }
 
+func (r *credentials) ID() string {
+	return r.MetaData.ID
+}
+
 func truncate(s string, n int) string {
 	if n > len(s) {
 		return s
@@ -102,7 +106,7 @@ func (r *credentials) matchGenDecl(decl *ast.GenDecl, ctx *gas.Context) (*gas.Is
 
 // NewHardcodedCredentials attempts to find high entropy string constants being
 // assigned to variables that appear to be related to credentials.
-func NewHardcodedCredentials(conf gas.Config) (gas.Rule, []ast.Node) {
+func NewHardcodedCredentials(id string, conf gas.Config) (gas.Rule, []ast.Node) {
 	pattern := `(?i)passwd|pass|password|pwd|secret|token`
 	entropyThreshold := 80.0
 	perCharThreshold := 3.0
@@ -142,6 +146,7 @@ func NewHardcodedCredentials(conf gas.Config) (gas.Rule, []ast.Node) {
 		ignoreEntropy:    ignoreEntropy,
 		truncate:         truncateString,
 		MetaData: gas.MetaData{
+			ID:         id,
 			What:       "Potential hardcoded credentials",
 			Confidence: gas.Low,
 			Severity:   gas.High,

rules/rand.go

@@ -26,6 +26,10 @@ type weakRand struct {
 	packagePath string
 }
 
+func (w *weakRand) ID() string {
+	return w.MetaData.ID
+}
+
 func (w *weakRand) Match(n ast.Node, c *gas.Context) (*gas.Issue, error) {
 	for _, funcName := range w.funcNames {
 		if _, matched := gas.MatchCallByPackage(n, c, w.packagePath, funcName); matched {
@@ -37,11 +41,12 @@ func (w *weakRand) Match(n ast.Node, c *gas.Context) (*gas.Issue, error) {
 }
 
 // NewWeakRandCheck detects the use of random number generator that isn't cryptographically secure
-func NewWeakRandCheck(conf gas.Config) (gas.Rule, []ast.Node) {
+func NewWeakRandCheck(id string, conf gas.Config) (gas.Rule, []ast.Node) {
 	return &weakRand{
 		funcNames:   []string{"Read", "Int"},
 		packagePath: "math/rand",
 		MetaData: gas.MetaData{
+			ID:         id,
 			Severity:   gas.High,
 			Confidence: gas.Medium,
 			What:       "Use of weak random number generator (math/rand instead of crypto/rand)",

rules/rsa.go

@@ -27,6 +27,10 @@ type weakKeyStrength struct {
 	bits  int
 }
 
+func (w *weakKeyStrength) ID() string {
+	return w.MetaData.ID
+}
+
 func (w *weakKeyStrength) Match(n ast.Node, c *gas.Context) (*gas.Issue, error) {
 	if callExpr := w.calls.ContainsCallExpr(n, c); callExpr != nil {
 		if bits, err := gas.GetInt(callExpr.Args[1]); err == nil && bits < (int64)(w.bits) {
@@ -37,7 +41,7 @@ func (w *weakKeyStrength) Match(n ast.Node, c *gas.Context) (*gas.Issue, error)
 }
 
 // NewWeakKeyStrength builds a rule that detects RSA keys < 2048 bits
-func NewWeakKeyStrength(conf gas.Config) (gas.Rule, []ast.Node) {
+func NewWeakKeyStrength(id string, conf gas.Config) (gas.Rule, []ast.Node) {
 	calls := gas.NewCallList()
 	calls.Add("crypto/rsa", "GenerateKey")
 	bits := 2048
@@ -45,6 +49,7 @@ func NewWeakKeyStrength(conf gas.Config) (gas.Rule, []ast.Node) {
 		calls: calls,
 		bits:  bits,
 		MetaData: gas.MetaData{
+			ID:         id,
 			Severity:   gas.Medium,
 			Confidence: gas.High,
 			What:       fmt.Sprintf("RSA keys should be at least %d bits", bits),

rules/rulelist.go

@@ -21,6 +21,7 @@ import (
 // RuleDefinition contains the description of a rule and a mechanism to
 // create it.
 type RuleDefinition struct {
+	ID          string
 	Description string
 	Create      gas.RuleBuilder
 }
@@ -29,10 +30,10 @@ type RuleDefinition struct {
 type RuleList map[string]RuleDefinition
 
 // Builders returns all the create methods for a given rule list
-func (rl RuleList) Builders() []gas.RuleBuilder {
+func (rl RuleList) Builders() map[string]gas.RuleBuilder {
-	builders := make([]gas.RuleBuilder, 0, len(rl))
+	builders := make(map[string]gas.RuleBuilder)
 	for _, def := range rl {
-		builders = append(builders, def.Create)
+		builders[def.ID] = def.Create
 	}
 	return builders
 }
@@ -58,45 +59,49 @@ func NewRuleFilter(action bool, ruleIDs ...string) RuleFilter {
 
 // Generate the list of rules to use
 func Generate(filters ...RuleFilter) RuleList {
-	rules := map[string]RuleDefinition{
+	rules := []RuleDefinition{
 		// misc
-		"G101": {"Look for hardcoded credentials", NewHardcodedCredentials},
+		RuleDefinition{"G101", "Look for hardcoded credentials", NewHardcodedCredentials},
-		"G102": {"Bind to all interfaces", NewBindsToAllNetworkInterfaces},
+		RuleDefinition{"G102", "Bind to all interfaces", NewBindsToAllNetworkInterfaces},
-		"G103": {"Audit the use of unsafe block", NewUsingUnsafe},
+		RuleDefinition{"G103", "Audit the use of unsafe block", NewUsingUnsafe},
-		"G104": {"Audit errors not checked", NewNoErrorCheck},
+		RuleDefinition{"G104", "Audit errors not checked", NewNoErrorCheck},
-		"G105": {"Audit the use of big.Exp function", NewUsingBigExp},
+		RuleDefinition{"G105", "Audit the use of big.Exp function", NewUsingBigExp},
-		"G106": {"Audit the use of ssh.InsecureIgnoreHostKey function", NewSSHHostKey},
+		RuleDefinition{"G106", "Audit the use of ssh.InsecureIgnoreHostKey function", NewSSHHostKey},
 
 		// injection
-		"G201": {"SQL query construction using format string", NewSQLStrFormat},
+		RuleDefinition{"G201", "SQL query construction using format string", NewSQLStrFormat},
-		"G202": {"SQL query construction using string concatenation", NewSQLStrConcat},
+		RuleDefinition{"G202", "SQL query construction using string concatenation", NewSQLStrConcat},
-		"G203": {"Use of unescaped data in HTML templates", NewTemplateCheck},
+		RuleDefinition{"G203", "Use of unescaped data in HTML templates", NewTemplateCheck},
-		"G204": {"Audit use of command execution", NewSubproc},
+		RuleDefinition{"G204", "Audit use of command execution", NewSubproc},
 
 		// filesystem
-		"G301": {"Poor file permissions used when creating a directory", NewMkdirPerms},
+		RuleDefinition{"G301", "Poor file permissions used when creating a directory", NewMkdirPerms},
-		"G302": {"Poor file permisions used when creation file or using chmod", NewFilePerms},
+		RuleDefinition{"G302", "Poor file permisions used when creation file or using chmod", NewFilePerms},
-		"G303": {"Creating tempfile using a predictable path", NewBadTempFile},
+		RuleDefinition{"G303", "Creating tempfile using a predictable path", NewBadTempFile},
 
 		// crypto
-		"G401": {"Detect the usage of DES, RC4, or MD5", NewUsesWeakCryptography},
+		RuleDefinition{"G401", "Detect the usage of DES, RC4, or MD5", NewUsesWeakCryptography},
-		"G402": {"Look for bad TLS connection settings", NewIntermediateTLSCheck},
+		RuleDefinition{"G402", "Look for bad TLS connection settings", NewIntermediateTLSCheck},
-		"G403": {"Ensure minimum RSA key length of 2048 bits", NewWeakKeyStrength},
+		RuleDefinition{"G403", "Ensure minimum RSA key length of 2048 bits", NewWeakKeyStrength},
-		"G404": {"Insecure random number source (rand)", NewWeakRandCheck},
+		RuleDefinition{"G404", "Insecure random number source (rand)", NewWeakRandCheck},
 
 		// blacklist
-		"G501": {"Import blacklist: crypto/md5", NewBlacklistedImportMD5},
+		RuleDefinition{"G501", "Import blacklist: crypto/md5", NewBlacklistedImportMD5},
-		"G502": {"Import blacklist: crypto/des", NewBlacklistedImportDES},
+		RuleDefinition{"G502", "Import blacklist: crypto/des", NewBlacklistedImportDES},
-		"G503": {"Import blacklist: crypto/rc4", NewBlacklistedImportRC4},
+		RuleDefinition{"G503", "Import blacklist: crypto/rc4", NewBlacklistedImportRC4},
-		"G504": {"Import blacklist: net/http/cgi", NewBlacklistedImportCGI},
+		RuleDefinition{"G504", "Import blacklist: net/http/cgi", NewBlacklistedImportCGI},
 	}
 
-	for rule := range rules {
+	ruleMap := make(map[string]RuleDefinition)
+
+RULES:
+	for _, rule := range rules {
 		for _, filter := range filters {
-			if filter(rule) {
+			if filter(rule.ID) {
-				delete(rules, rule)
+				continue RULES
 			}
 		}
+		ruleMap[rule.ID] = rule
 	}
-	return rules
+	return ruleMap
 }

rules/rules_test.go

@@ -26,7 +26,7 @@ var _ = Describe("gas rules", func() {
 		config = gas.NewConfig()
 		analyzer = gas.NewAnalyzer(config, logger)
 		runner = func(rule string, samples []testutils.CodeSample) {
-			analyzer.LoadRules(rules.Generate(rules.NewRuleFilter(false, rule)).Builders()...)
+			analyzer.LoadRules(rules.Generate(rules.NewRuleFilter(false, rule)).Builders())
 			for n, sample := range samples {
 				analyzer.Reset()
 				pkg := testutils.NewTestPackage()

rules/sql.go

@@ -28,6 +28,10 @@ type sqlStatement struct {
 	patterns []*regexp.Regexp
 }
 
+func (r *sqlStatement) ID() string {
+	return r.MetaData.ID
+}
+
 // See if the string matches the patterns for the statement.
 func (s sqlStatement) MatchPatterns(str string) bool {
 	for _, pattern := range s.patterns {
@@ -42,6 +46,10 @@ type sqlStrConcat struct {
 	sqlStatement
 }
 
+func (r *sqlStrConcat) ID() string {
+	return r.MetaData.ID
+}
+
 // see if we can figure out what it is
 func (s *sqlStrConcat) checkObject(n *ast.Ident) bool {
 	if n.Obj != nil {
@@ -72,13 +80,14 @@ func (s *sqlStrConcat) Match(n ast.Node, c *gas.Context) (*gas.Issue, error) {
 }
 
 // NewSQLStrConcat looks for cases where we are building SQL strings via concatenation
-func NewSQLStrConcat(conf gas.Config) (gas.Rule, []ast.Node) {
+func NewSQLStrConcat(id string, conf gas.Config) (gas.Rule, []ast.Node) {
 	return &sqlStrConcat{
 		sqlStatement: sqlStatement{
 			patterns: []*regexp.Regexp{
 				regexp.MustCompile(`(?)(SELECT|DELETE|INSERT|UPDATE|INTO|FROM|WHERE) `),
 			},
 			MetaData: gas.MetaData{
+				ID:         id,
 				Severity:   gas.Medium,
 				Confidence: gas.High,
 				What:       "SQL string concatenation",
@@ -105,7 +114,7 @@ func (s *sqlStrFormat) Match(n ast.Node, c *gas.Context) (*gas.Issue, error) {
 }
 
 // NewSQLStrFormat looks for cases where we're building SQL query strings using format strings
-func NewSQLStrFormat(conf gas.Config) (gas.Rule, []ast.Node) {
+func NewSQLStrFormat(id string, conf gas.Config) (gas.Rule, []ast.Node) {
 	rule := &sqlStrFormat{
 		calls: gas.NewCallList(),
 		sqlStatement: sqlStatement{
@@ -114,6 +123,7 @@ func NewSQLStrFormat(conf gas.Config) (gas.Rule, []ast.Node) {
 				regexp.MustCompile("%[^bdoxXfFp]"),
 			},
 			MetaData: gas.MetaData{
+				ID:         id,
 				Severity:   gas.Medium,
 				Confidence: gas.High,
 				What:       "SQL string formatting",

rules/ssh.go

@@ -12,6 +12,10 @@ type sshHostKey struct {
 	calls []string
 }
 
+func (r *sshHostKey) ID() string {
+	return r.MetaData.ID
+}
+
 func (r *sshHostKey) Match(n ast.Node, c *gas.Context) (gi *gas.Issue, err error) {
 	if _, matches := gas.MatchCallByPackage(n, c, r.pkg, r.calls...); matches {
 		return gas.NewIssue(c, n, r.What, r.Severity, r.Confidence), nil
@@ -20,11 +24,12 @@ func (r *sshHostKey) Match(n ast.Node, c *gas.Context) (gi *gas.Issue, err error
 }
 
 // NewSSHHostKey rule detects the use of insecure ssh HostKeyCallback.
-func NewSSHHostKey(conf gas.Config) (gas.Rule, []ast.Node) {
+func NewSSHHostKey(id string, conf gas.Config) (gas.Rule, []ast.Node) {
 	return &sshHostKey{
 		pkg:   "golang.org/x/crypto/ssh",
 		calls: []string{"InsecureIgnoreHostKey"},
 		MetaData: gas.MetaData{
+			ID:         id,
 			What:       "Use of ssh InsecureIgnoreHostKey should be audited",
 			Severity:   gas.Medium,
 			Confidence: gas.High,

rules/subproc.go

@@ -22,9 +22,14 @@ import (
 )
 
 type subprocess struct {
+	gas.MetaData
 	gas.CallList
 }
 
+func (r *subprocess) ID() string {
+	return r.MetaData.ID
+}
+
 // TODO(gm) The only real potential for command injection with a Go project
 // is something like this:
 //
@@ -50,8 +55,8 @@ func (r *subprocess) Match(n ast.Node, c *gas.Context) (*gas.Issue, error) {
 }
 
 // NewSubproc detects cases where we are forking out to an external process
-func NewSubproc(conf gas.Config) (gas.Rule, []ast.Node) {
+func NewSubproc(id string, conf gas.Config) (gas.Rule, []ast.Node) {
-	rule := &subprocess{gas.NewCallList()}
+	rule := &subprocess{gas.MetaData{ID: id}, gas.NewCallList()}
 	rule.Add("os/exec", "Command")
 	rule.Add("syscall", "Exec")
 	return rule, []ast.Node{(*ast.CallExpr)(nil)}

rules/tempfiles.go

@@ -27,6 +27,10 @@ type badTempFile struct {
 	args  *regexp.Regexp
 }
 
+func (t *badTempFile) ID() string {
+	return t.MetaData.ID
+}
+
 func (t *badTempFile) Match(n ast.Node, c *gas.Context) (gi *gas.Issue, err error) {
 	if node := t.calls.ContainsCallExpr(n, c); node != nil {
 		if arg, e := gas.GetString(node.Args[0]); t.args.MatchString(arg) && e == nil {
@@ -37,7 +41,7 @@ func (t *badTempFile) Match(n ast.Node, c *gas.Context) (gi *gas.Issue, err erro
 }
 
 // NewBadTempFile detects direct writes to predictable path in temporary directory
-func NewBadTempFile(conf gas.Config) (gas.Rule, []ast.Node) {
+func NewBadTempFile(id string, conf gas.Config) (gas.Rule, []ast.Node) {
 	calls := gas.NewCallList()
 	calls.Add("io/ioutil", "WriteFile")
 	calls.Add("os", "Create")
@@ -45,6 +49,7 @@ func NewBadTempFile(conf gas.Config) (gas.Rule, []ast.Node) {
 		calls: calls,
 		args:  regexp.MustCompile(`^/tmp/.*$|^/var/tmp/.*$`),
 		MetaData: gas.MetaData{
+			ID:         id,
 			Severity:   gas.Medium,
 			Confidence: gas.High,
 			What:       "File creation in shared tmp directory without using ioutil.Tempfile",

rules/templates.go

@@ -25,6 +25,10 @@ type templateCheck struct {
 	calls gas.CallList
 }
 
+func (t *templateCheck) ID() string {
+	return t.MetaData.ID
+}
+
 func (t *templateCheck) Match(n ast.Node, c *gas.Context) (*gas.Issue, error) {
 	if node := t.calls.ContainsCallExpr(n, c); node != nil {
 		for _, arg := range node.Args {
@@ -38,7 +42,7 @@ func (t *templateCheck) Match(n ast.Node, c *gas.Context) (*gas.Issue, error) {
 
 // NewTemplateCheck constructs the template check rule. This rule is used to
 // find use of tempaltes where HTML/JS escaping is not being used
-func NewTemplateCheck(conf gas.Config) (gas.Rule, []ast.Node) {
+func NewTemplateCheck(id string, conf gas.Config) (gas.Rule, []ast.Node) {
 
 	calls := gas.NewCallList()
 	calls.Add("html/template", "HTML")
@@ -48,6 +52,7 @@ func NewTemplateCheck(conf gas.Config) (gas.Rule, []ast.Node) {
 	return &templateCheck{
 		calls: calls,
 		MetaData: gas.MetaData{
+			ID:         id,
 			Severity:   gas.Medium,
 			Confidence: gas.Low,
 			What:       "this method will not auto-escape HTML. Verify data is well formed.",

rules/tls.go

@@ -24,12 +24,17 @@ import (
 )
 
 type insecureConfigTLS struct {
+	gas.MetaData
 	MinVersion   int16
 	MaxVersion   int16
 	requiredType string
 	goodCiphers  []string
 }
 
+func (t *insecureConfigTLS) ID() string {
+	return t.MetaData.ID
+}
+
 func stringInSlice(a string, list []string) bool {
 	for _, b := range list {
 		if b == a {

rules/tls_config.go

@@ -8,8 +8,9 @@ import (
 
 // NewModernTLSCheck creates a check for Modern TLS ciphers
 // DO NOT EDIT - generated by tlsconfig tool
-func NewModernTLSCheck(conf gas.Config) (gas.Rule, []ast.Node) {
+func NewModernTLSCheck(id string, conf gas.Config) (gas.Rule, []ast.Node) {
 	return &insecureConfigTLS{
+		MetaData:     gas.MetaData{ID: id},
 		requiredType: "crypto/tls.Config",
 		MinVersion:   0x0303,
 		MaxVersion:   0x0303,
@@ -28,8 +29,9 @@ func NewModernTLSCheck(conf gas.Config) (gas.Rule, []ast.Node) {
 
 // NewIntermediateTLSCheck creates a check for Intermediate TLS ciphers
 // DO NOT EDIT - generated by tlsconfig tool
-func NewIntermediateTLSCheck(conf gas.Config) (gas.Rule, []ast.Node) {
+func NewIntermediateTLSCheck(id string, conf gas.Config) (gas.Rule, []ast.Node) {
 	return &insecureConfigTLS{
+		MetaData:     gas.MetaData{ID: id},
 		requiredType: "crypto/tls.Config",
 		MinVersion:   0x0301,
 		MaxVersion:   0x0303,
@@ -68,8 +70,9 @@ func NewIntermediateTLSCheck(conf gas.Config) (gas.Rule, []ast.Node) {
 
 // NewOldTLSCheck creates a check for Old TLS ciphers
 // DO NOT EDIT - generated by tlsconfig tool
-func NewOldTLSCheck(conf gas.Config) (gas.Rule, []ast.Node) {
+func NewOldTLSCheck(id string, conf gas.Config) (gas.Rule, []ast.Node) {
 	return &insecureConfigTLS{
+		MetaData:     gas.MetaData{ID: id},
 		requiredType: "crypto/tls.Config",
 		MinVersion:   0x0300,
 		MaxVersion:   0x0303,

rules/unsafe.go

@@ -26,6 +26,10 @@ type usingUnsafe struct {
 	calls []string
 }
 
+func (r *usingUnsafe) ID() string {
+	return r.MetaData.ID
+}
+
 func (r *usingUnsafe) Match(n ast.Node, c *gas.Context) (gi *gas.Issue, err error) {
 	if _, matches := gas.MatchCallByPackage(n, c, r.pkg, r.calls...); matches {
 		return gas.NewIssue(c, n, r.What, r.Severity, r.Confidence), nil
@@ -35,11 +39,12 @@ func (r *usingUnsafe) Match(n ast.Node, c *gas.Context) (gi *gas.Issue, err erro
 
 // NewUsingUnsafe rule detects the use of the unsafe package. This is only
 // really useful for auditing purposes.
-func NewUsingUnsafe(conf gas.Config) (gas.Rule, []ast.Node) {
+func NewUsingUnsafe(id string, conf gas.Config) (gas.Rule, []ast.Node) {
 	return &usingUnsafe{
 		pkg:   "unsafe",
 		calls: []string{"Alignof", "Offsetof", "Sizeof", "Pointer"},
 		MetaData: gas.MetaData{
+			ID:         id,
 			What:       "Use of unsafe calls should be audited",
 			Severity:   gas.Low,
 			Confidence: gas.High,

rules/weakcrypto.go

@@ -25,8 +25,11 @@ type usesWeakCryptography struct {
 	blacklist map[string][]string
 }
 
-func (r *usesWeakCryptography) Match(n ast.Node, c *gas.Context) (*gas.Issue, error) {
+func (r *usesWeakCryptography) ID() string {
+	return r.MetaData.ID
+}
 
+func (r *usesWeakCryptography) Match(n ast.Node, c *gas.Context) (*gas.Issue, error) {
 	for pkg, funcs := range r.blacklist {
 		if _, matched := gas.MatchCallByPackage(n, c, pkg, funcs...); matched {
 			return gas.NewIssue(c, n, r.What, r.Severity, r.Confidence), nil
@@ -36,7 +39,7 @@ func (r *usesWeakCryptography) Match(n ast.Node, c *gas.Context) (*gas.Issue, er
 }
 
 // NewUsesWeakCryptography detects uses of des.* md5.* or rc4.*
-func NewUsesWeakCryptography(conf gas.Config) (gas.Rule, []ast.Node) {
+func NewUsesWeakCryptography(id string, conf gas.Config) (gas.Rule, []ast.Node) {
 	calls := make(map[string][]string)
 	calls["crypto/des"] = []string{"NewCipher", "NewTripleDESCipher"}
 	calls["crypto/md5"] = []string{"New", "Sum"}
@@ -44,6 +47,7 @@ func NewUsesWeakCryptography(conf gas.Config) (gas.Rule, []ast.Node) {
 	rule := &usesWeakCryptography{
 		blacklist: calls,
 		MetaData: gas.MetaData{
+			ID:         id,
 			Severity:   gas.Medium,
 			Confidence: gas.High,
 			What:       "Use of weak cryptographic primitive",