Merge remote-tracking branch 'upstream/master'

.travis.yml

@@ -1,14 +1,25 @@
 language: go
-before_script:
+
-  - go vet $(go list ./... | grep -v /vendor/)
 go:
-  - 1.5
+  - 1.7
+  - 1.8
+  - 1.9
   - tip
+
 install:
+  - go get -u github.com/golang/lint/golint
   - go get -v github.com/onsi/ginkgo/ginkgo
   - go get -v github.com/onsi/gomega
+  - go get -v golang.org/x/crypto/ssh
+  - go get github.com/GoASTScanner/gas/cmd/gas/...
   - go get -v -t ./...
   - export PATH=$PATH:$HOME/gopath/bin
 
+before_script:
+  - test -z "$(gofmt -s -l -w $(find . -type f -name '*.go' -not -path './vendor/*') | tee /dev/stderr)"
+  - test -z "$(golint . |  tee /dev/stderr)"
+  - go vet $(go list ./... | grep -v /vendor/)
+  - gas ./...
+
 script: ginkgo -r
 

Godeps/Godeps.json

@@ -1,8 +1,20 @@
 {
 	"ImportPath": "github.com/GoASTScanner/gas",
 	"GoVersion": "go1.9",
-	"GodepVersion": "v79",
+	"GodepVersion": "v80",
+	"Packages": [
+		"./..."
+	],
 	"Deps": [
+		{
+			"ImportPath": "github.com/kisielk/gotool",
+			"Rev": "0de1eaf82fa3f583ce21fde859f1e7e0c5e9b220"
+		},
+		{
+			"ImportPath": "github.com/mozilla/tls-observatory/constants",
+			"Comment": "1.2.32-17-g17e0ce4b",
+			"Rev": "17e0ce4bfc46eae3d57acf13a2d7c7517655d493"
+		},
 		{
 			"ImportPath": "github.com/nbutton23/zxcvbn-go",
 			"Rev": "a22cb81b2ecdde8b68e9ffb8824731cbf88e1de4"
@@ -189,6 +201,11 @@
 			"Comment": "v1.2.0-2-gdcabb60",
 			"Rev": "dcabb60a477c2b6f456df65037cb6708210fbb02"
 		},
+		{
+			"ImportPath": "github.com/ryanuber/go-glob",
+			"Comment": "v0.1-4-g256dc44",
+			"Rev": "256dc444b735e061061cf46c809487313d5b0065"
+		},
 		{
 			"ImportPath": "golang.org/x/net/html",
 			"Rev": "8351a756f30f1297fe94bbf4b767ec589c6ea6d0"

README.md

@@ -41,6 +41,7 @@ or to specify a set of rules to explicitly exclude using the '-exclude=' flag.
   - G103: Audit the use of unsafe block
   - G104: Audit errors not checked
   - G105: Audit the use of math/big.Int.Exp
+  - G106: Audit the use of ssh.InsecureIgnoreHostKey
   - G201: SQL query construction using format string
   - G202: SQL query construction using string concatenation
   - G203: Use of unescaped data in HTML templates
@@ -104,7 +105,7 @@ $ gas -nosec=true ./...
 
 ### Output formats
 
-Gas currently supports text, json and csv output formats. By default
+Gas currently supports text, json, csv and JUnit XML output formats. By default
 results will be reported to stdout, but can also be written to an output
 file. The output format is controlled by the '-fmt' flag, and the output file is controlled by the '-out' flag as follows:
 
@@ -113,3 +114,21 @@ file. The output format is controlled by the '-fmt' flag, and the output file is
 $ gas -fmt=json -out=results.json *.go
 ```
 
+### Generate TLS rule
+
+The configuration of TLS rule can be generated from [Mozilla's TLS ciphers recommendation](https://statics.tls.security.mozilla.org/server-side-tls-conf.json).
+
+
+First you need to install the generator tool:
+
+```
+go get github.com/GoASTScanner/gas/cmd/tlsconfig/...
+```
+
+You can invoke now the `go generate` in the root of the project:
+
+```
+go generate ./...
+```
+
+This will generate the `rules/tls_config.go` file with will contain the current ciphers recommendation from Mozilla.

analyzer.go

@@ -102,7 +102,10 @@ func (gas *Analyzer) Process(packagePaths ...string) error {
 		AllowErrors: true,
 	}
 	for _, packagePath := range packagePaths {
-		abspath, _ := filepath.Abs(packagePath)
+		abspath, err := filepath.Abs(packagePath)
+		if err != nil {
+			return err
+		}
 		gas.logger.Println("Searching directory:", abspath)
 
 		basePackage, err := build.Default.ImportDir(packagePath, build.ImportComment)

cmd/gas/main.go

@@ -59,7 +59,7 @@ var (
 	flagIgnoreNoSec = flag.Bool("nosec", false, "Ignores #nosec comments when set")
 
 	// format output
-	flagFormat = flag.String("fmt", "text", "Set output format. Valid options are: json, csv, html, or text")
+	flagFormat = flag.String("fmt", "text", "Set output format. Valid options are: json, csv, junit-xml, html, or text")
 
 	// output file
 	flagOutput = flag.String("out", "", "Set output file for results")
@@ -79,6 +79,9 @@ var (
 	// log to file or stderr
 	flagLogfile = flag.String("log", "", "Log messages to file rather than stderr")
 
+	// sort the issues by severity
+	flagSortIssues = flag.Bool("sort", true, "Sort issues by severity")
+
 	logger *log.Logger
 )
 
@@ -149,9 +152,15 @@ func saveOutput(filename, format string, issues []*gas.Issue, metrics *gas.Metri
 			return err
 		}
 		defer outfile.Close()
-		output.CreateReport(outfile, format, issues, metrics)
+		err = output.CreateReport(outfile, format, issues, metrics)
+		if err != nil {
+			return err
+		}
 	} else {
-		output.CreateReport(os.Stdout, format, issues, metrics)
+		err := output.CreateReport(os.Stdout, format, issues, metrics)
+		if err != nil {
+			return err
+		}
 	}
 	return nil
 }
@@ -166,7 +175,7 @@ func main() {
 
 	// Ensure at least one file was specified
 	if flag.NArg() == 0 {
-		fmt.Fprintf(os.Stderr, "\nError: FILE [FILE...] or './...' expected\n")
+		fmt.Fprintf(os.Stderr, "\nError: FILE [FILE...] or './...' expected\n") // #nosec
 		flag.Usage()
 		os.Exit(1)
 	}
@@ -225,13 +234,18 @@ func main() {
 		os.Exit(0)
 	}
 
+	// Sort the issue by severity
+	if *flagSortIssues {
+		sortIssues(issues)
+	}
+
 	// Create output report
 	if err := saveOutput(*flagOutput, *flagFormat, issues, metrics); err != nil {
 		logger.Fatal(err)
 	}
 
 	// Finialize logging
-	logWriter.Close()
+	logWriter.Close() // #nosec
 
 	// Do we have an issue? If so exit 1
 	if issuesFound {

cmd/gas/sort_issues.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"sort"
+
+	"github.com/GoASTScanner/gas"
+)
+
+type sortBySeverity []*gas.Issue
+
+func (s sortBySeverity) Len() int { return len(s) }
+
+func (s sortBySeverity) Less(i, j int) bool { return s[i].Severity > s[i].Severity }
+
+func (s sortBySeverity) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
+
+// sortIssues sorts the issues by severity in descending order
+func sortIssues(issues []*gas.Issue) {
+	sort.Sort(sortBySeverity(issues))
+}

cmd/tlsconfig/header_template.go

@@ -0,0 +1,13 @@
+package main
+
+import "text/template"
+
+var generatedHeaderTmpl = template.Must(template.New("generated").Parse(`
+package {{.}}
+
+import (
+	"go/ast"
+
+	"github.com/GoASTScanner/gas"
+)
+`))

cmd/tlsconfig/rule_template.go

@@ -0,0 +1,19 @@
+package main
+
+import "text/template"
+
+var generatedRuleTmpl = template.Must(template.New("generated").Parse(`
+// New{{.Name}}TLSCheck creates a check for {{.Name}} TLS ciphers
+// DO NOT EDIT - generated by tlsconfig tool
+func New{{.Name}}TLSCheck(conf gas.Config) (gas.Rule, []ast.Node) {
+	return &insecureConfigTLS{
+		requiredType: "crypto/tls.Config",
+		MinVersion:   {{ .MinVersion }},
+		MaxVersion:   {{ .MaxVersion }},
+		goodCiphers: []string{
+{{range $cipherName := .Ciphers }} "{{$cipherName}}",
+{{end}}
+		},
+	}, []ast.Node{(*ast.CompositeLit)(nil)}
+}
+`))

cmd/tlsconfig/tlsconfig.go

@@ -0,0 +1,204 @@
+package main
+
+import (
+	"bytes"
+	"crypto/tls"
+	"encoding/json"
+	"errors"
+	"flag"
+	"fmt"
+	"go/format"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"path/filepath"
+	"sort"
+	"strings"
+
+	"github.com/mozilla/tls-observatory/constants"
+)
+
+var (
+	pkg        = flag.String("pkg", "rules", "package name to be added to the output file")
+	outputFile = flag.String("outputFile", "tls_config.go", "name of the output file")
+)
+
+// TLSConfURL url where Mozilla publishes the TLS ciphers recommendations
+const TLSConfURL = "https://statics.tls.security.mozilla.org/server-side-tls-conf.json"
+
+// ServerSideTLSJson contains all the available configurations and the version of the current document.
+type ServerSideTLSJson struct {
+	Configurations map[string]Configuration `json:"configurations"`
+	Version        float64                  `json:"version"`
+}
+
+// Configuration represents configurations levels declared by the Mozilla server-side-tls
+// see https://wiki.mozilla.org/Security/Server_Side_TLS
+type Configuration struct {
+	OpenSSLCiphersuites   string   `json:"openssl_ciphersuites"`
+	Ciphersuites          []string `json:"ciphersuites"`
+	TLSVersions           []string `json:"tls_versions"`
+	TLSCurves             []string `json:"tls_curves"`
+	CertificateTypes      []string `json:"certificate_types"`
+	CertificateCurves     []string `json:"certificate_curves"`
+	CertificateSignatures []string `json:"certificate_signatures"`
+	RsaKeySize            float64  `json:"rsa_key_size"`
+	DHParamSize           float64  `json:"dh_param_size"`
+	ECDHParamSize         float64  `json:"ecdh_param_size"`
+	HstsMinAge            float64  `json:"hsts_min_age"`
+	OldestClients         []string `json:"oldest_clients"`
+}
+
+type goCipherConfiguration struct {
+	Name       string
+	Ciphers    []string
+	MinVersion string
+	MaxVersion string
+}
+
+type goTLSConfiguration struct {
+	cipherConfigs []goCipherConfiguration
+}
+
+// getTLSConfFromURL retrieves the json containing the TLS configurations from the specified URL.
+func getTLSConfFromURL(url string) (*ServerSideTLSJson, error) {
+	r, err := http.Get(url)
+	if err != nil {
+		return nil, err
+	}
+	defer r.Body.Close()
+
+	var sstls ServerSideTLSJson
+	err = json.NewDecoder(r.Body).Decode(&sstls)
+	if err != nil {
+		return nil, err
+	}
+
+	return &sstls, nil
+}
+
+func getGoCipherConfig(name string, sstls ServerSideTLSJson) (goCipherConfiguration, error) {
+	cipherConf := goCipherConfiguration{Name: strings.Title(name)}
+	conf, ok := sstls.Configurations[name]
+	if !ok {
+		return cipherConf, fmt.Errorf("TLS configuration '%s' not found", name)
+	}
+
+	for _, cipherName := range conf.Ciphersuites {
+		cipherSuite, ok := constants.CipherSuites[cipherName]
+		if !ok {
+			log.Printf("Warning: cannot map cipher '%s'\n", cipherName)
+		}
+		if len(cipherSuite.IANAName) > 0 {
+			cipherConf.Ciphers = append(cipherConf.Ciphers, cipherSuite.IANAName)
+		}
+	}
+
+	versions := mapTLSVersions(conf.TLSVersions)
+	if len(versions) > 0 {
+		cipherConf.MinVersion = fmt.Sprintf("0x%04x", versions[0])
+		cipherConf.MaxVersion = fmt.Sprintf("0x%04x", versions[len(versions)-1])
+	} else {
+		return cipherConf, fmt.Errorf("No TLS versions found for configuration '%s'", name)
+	}
+	return cipherConf, nil
+}
+
+func mapTLSVersions(tlsVersions []string) []int {
+	var versions []int
+	for _, tlsVersion := range tlsVersions {
+		switch tlsVersion {
+		case "TLSv1.2":
+			versions = append(versions, tls.VersionTLS12)
+		case "TLSv1.1":
+			versions = append(versions, tls.VersionTLS11)
+		case "TLSv1":
+			versions = append(versions, tls.VersionTLS10)
+		case "SSLv3":
+			versions = append(versions, tls.VersionSSL30)
+		default:
+			continue
+		}
+	}
+	sort.Ints(versions)
+	return versions
+}
+
+func getGoTLSConf() (goTLSConfiguration, error) {
+	sstls, err := getTLSConfFromURL(TLSConfURL)
+	if err != nil || sstls == nil {
+		msg := fmt.Sprintf("Could not load the Server Side TLS configuration from Mozilla's website. Check the URL: %s. Error: %v\n",
+			TLSConfURL, err)
+		panic(msg)
+	}
+
+	tlsConfg := goTLSConfiguration{}
+
+	modern, err := getGoCipherConfig("modern", *sstls)
+	if err != nil {
+		return tlsConfg, err
+	}
+	tlsConfg.cipherConfigs = append(tlsConfg.cipherConfigs, modern)
+
+	intermediate, err := getGoCipherConfig("intermediate", *sstls)
+	if err != nil {
+		return tlsConfg, err
+	}
+	tlsConfg.cipherConfigs = append(tlsConfg.cipherConfigs, intermediate)
+
+	old, err := getGoCipherConfig("old", *sstls)
+	if err != nil {
+		return tlsConfg, err
+	}
+	tlsConfg.cipherConfigs = append(tlsConfg.cipherConfigs, old)
+
+	return tlsConfg, nil
+}
+
+func getCurrentDir() (string, error) {
+	dir := "."
+	if args := flag.Args(); len(args) == 1 {
+		dir = args[0]
+	} else if len(args) > 1 {
+		return "", errors.New("only one directory at a time")
+	}
+	dir, err := filepath.Abs(dir)
+	if err != nil {
+		return "", err
+	}
+	return dir, nil
+}
+
+func main() {
+	dir, err := getCurrentDir()
+	if err != nil {
+		log.Fatalln(err)
+	}
+	tlsConfig, err := getGoTLSConf()
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	var buf bytes.Buffer
+	err = generatedHeaderTmpl.Execute(&buf, *pkg)
+	if err != nil {
+		log.Fatalf("Failed to generate the header: %v", err)
+	}
+	for _, cipherConfig := range tlsConfig.cipherConfigs {
+		err := generatedRuleTmpl.Execute(&buf, cipherConfig)
+		if err != nil {
+			log.Fatalf("Failed to generated the cipher config: %v", err)
+		}
+	}
+
+	src, err := format.Source(buf.Bytes())
+	if err != nil {
+		log.Printf("warnings: Failed to format the code: %v", err)
+		src = buf.Bytes()
+	}
+
+	outputPath := filepath.Join(dir, *outputFile)
+	if err := ioutil.WriteFile(outputPath, src, 0644); err != nil {
+		log.Fatalf("Writing output: %s", err)
+	}
+}

import_tracker_test.go

@@ -1,30 +0,0 @@
-package gas_test
-
-import (
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-)
-
-var _ = Describe("ImportTracker", func() {
-	var (
-		source string
-	)
-
-	BeforeEach(func() {
-		source = `// TODO(gm)`
-	})
-	Context("when I have a valid go package", func() {
-		It("should record all import specs", func() {
-            Expect(source).To(Equal(source))
-			Skip("Not implemented")
-		})
-
-		It("should correctly track aliased package imports", func() {
-			Skip("Not implemented")
-		})
-
-		It("should correctly track init only packages", func() {
-			Skip("Not implemented")
-		})
-	})
-})

issue.go

@@ -76,7 +76,7 @@ func codeSnippet(file *os.File, start int64, end int64, n ast.Node) (string, err
 	}
 
 	size := (int)(end - start) // Go bug, os.File.Read should return int64 ...
-	file.Seek(start, 0)
+	file.Seek(start, 0)        // #nosec
 
 	buf := make([]byte, size)
 	if nread, err := file.Read(buf); err != nil || nread != size {

output/formatter.go

@@ -17,6 +17,7 @@ package output
 import (
 	"encoding/csv"
 	"encoding/json"
+	"encoding/xml"
 	htmlTemplate "html/template"
 	"io"
 	plainTemplate "text/template"
@@ -36,6 +37,9 @@ const (
 
 	// ReportCSV set the output format to csv
 	ReportCSV // CSV format
+
+	// ReportJUnitXML set the output format to junit xml
+	ReportJUnitXML // JUnit XML format
 )
 
 var text = `Results:
@@ -70,6 +74,8 @@ func CreateReport(w io.Writer, format string, issues []*gas.Issue, metrics *gas.
 		err = reportJSON(w, data)
 	case "csv":
 		err = reportCSV(w, data)
+	case "junit-xml":
+		err = reportJUnitXML(w, data)
 	case "html":
 		err = reportFromHTMLTemplate(w, html, data)
 	case "text":
@@ -112,6 +118,25 @@ func reportCSV(w io.Writer, data *reportInfo) error {
 	return nil
 }
 
+func reportJUnitXML(w io.Writer, data *reportInfo) error {
+	groupedData := groupDataByRules(data)
+	junitXMLStruct := createJUnitXMLStruct(groupedData)
+
+	raw, err := xml.MarshalIndent(junitXMLStruct, "", "\t")
+	if err != nil {
+		return err
+	}
+
+	xmlHeader := []byte("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n")
+	raw = append(xmlHeader, raw...)
+	_, err = w.Write(raw)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
 func reportFromPlaintextTemplate(w io.Writer, reportTemplate string, data *reportInfo) error {
 	t, e := plainTemplate.New("gas").Parse(reportTemplate)
 	if e != nil {

output/junit_xml_format.go

@@ -0,0 +1,74 @@
+package output
+
+import (
+	"encoding/xml"
+	htmlLib "html"
+	"strconv"
+
+	"github.com/GoASTScanner/gas"
+)
+
+type junitXMLReport struct {
+	XMLName    xml.Name    `xml:"testsuites"`
+	Testsuites []testsuite `xml:"testsuite"`
+}
+
+type testsuite struct {
+	XMLName   xml.Name   `xml:"testsuite"`
+	Name      string     `xml:"name,attr"`
+	Tests     int        `xml:"tests,attr"`
+	Testcases []testcase `xml:"testcase"`
+}
+
+type testcase struct {
+	XMLName xml.Name `xml:"testcase"`
+	Name    string   `xml:"name,attr"`
+	Failure failure  `xml:"failure"`
+}
+
+type failure struct {
+	XMLName xml.Name `xml:"failure"`
+	Message string   `xml:"message,attr"`
+	Text    string   `xml:",innerxml"`
+}
+
+func generatePlaintext(issue *gas.Issue) string {
+	return "Results:\n" +
+		"[" + issue.File + ":" + issue.Line + "] - " +
+		issue.What + " (Confidence: " + strconv.Itoa(int(issue.Confidence)) +
+		", Severity: " + strconv.Itoa(int(issue.Severity)) + ")\n" + "> " + htmlLib.EscapeString(issue.Code)
+}
+
+func groupDataByRules(data *reportInfo) map[string][]*gas.Issue {
+	groupedData := make(map[string][]*gas.Issue)
+	for _, issue := range data.Issues {
+		if _, ok := groupedData[issue.What]; ok {
+			groupedData[issue.What] = append(groupedData[issue.What], issue)
+		} else {
+			groupedData[issue.What] = []*gas.Issue{issue}
+		}
+	}
+	return groupedData
+}
+
+func createJUnitXMLStruct(groupedData map[string][]*gas.Issue) junitXMLReport {
+	var xmlReport junitXMLReport
+	for what, issues := range groupedData {
+		testsuite := testsuite{
+			Name:  what,
+			Tests: len(issues),
+		}
+		for _, issue := range issues {
+			testcase := testcase{
+				Name: issue.File,
+				Failure: failure{
+					Message: "Found 1 vulnerability. See stacktrace for details.",
+					Text:    generatePlaintext(issue),
+				},
+			}
+			testsuite.Testcases = append(testsuite.Testcases, testcase)
+		}
+		xmlReport.Testsuites = append(xmlReport.Testsuites, testsuite)
+	}
+	return xmlReport
+}

rules/errors.go

@@ -77,7 +77,7 @@ func NewNoErrorCheck(conf gas.Config) (gas.Rule, []ast.Node) {
 	// black list instead.
 	whitelist := gas.NewCallList()
 	whitelist.AddAll("bytes.Buffer", "Write", "WriteByte", "WriteRune", "WriteString")
-	whitelist.AddAll("fmt", "Print", "Printf", "Println")
+	whitelist.AddAll("fmt", "Print", "Printf", "Println", "Fprint", "Fprintf", "Fprintln")
 	whitelist.Add("io.PipeWriter", "CloseWithError")
 
 	if configured, ok := conf["G104"]; ok {

rules/fileperms.go

@@ -75,7 +75,7 @@ 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) {
-	mode := getConfiguredMode(conf, "G301", 0700)
+	mode := getConfiguredMode(conf, "G301", 0750)
 	return &filePermissions{
 		mode:  mode,
 		pkg:   "os",

rules/rulelist.go

@@ -60,34 +60,35 @@ func NewRuleFilter(action bool, ruleIDs ...string) RuleFilter {
 func Generate(filters ...RuleFilter) RuleList {
 	rules := map[string]RuleDefinition{
 		// misc
-		"G101": RuleDefinition{"Look for hardcoded credentials", NewHardcodedCredentials},
+		"G101": {"Look for hardcoded credentials", NewHardcodedCredentials},
-		"G102": RuleDefinition{"Bind to all interfaces", NewBindsToAllNetworkInterfaces},
+		"G102": {"Bind to all interfaces", NewBindsToAllNetworkInterfaces},
-		"G103": RuleDefinition{"Audit the use of unsafe block", NewUsingUnsafe},
+		"G103": {"Audit the use of unsafe block", NewUsingUnsafe},
-		"G104": RuleDefinition{"Audit errors not checked", NewNoErrorCheck},
+		"G104": {"Audit errors not checked", NewNoErrorCheck},
-		"G105": RuleDefinition{"Audit the use of big.Exp function", NewUsingBigExp},
+		"G105": {"Audit the use of big.Exp function", NewUsingBigExp},
+		"G106": {"Audit the use of ssh.InsecureIgnoreHostKey function", NewSSHHostKey},
 
 		// injection
-		"G201": RuleDefinition{"SQL query construction using format string", NewSQLStrFormat},
+		"G201": {"SQL query construction using format string", NewSQLStrFormat},
-		"G202": RuleDefinition{"SQL query construction using string concatenation", NewSQLStrConcat},
+		"G202": {"SQL query construction using string concatenation", NewSQLStrConcat},
-		"G203": RuleDefinition{"Use of unescaped data in HTML templates", NewTemplateCheck},
+		"G203": {"Use of unescaped data in HTML templates", NewTemplateCheck},
-		"G204": RuleDefinition{"Audit use of command execution", NewSubproc},
+		"G204": {"Audit use of command execution", NewSubproc},
 
 		// filesystem
-		"G301": RuleDefinition{"Poor file permissions used when creating a directory", NewMkdirPerms},
+		"G301": {"Poor file permissions used when creating a directory", NewMkdirPerms},
-		"G302": RuleDefinition{"Poor file permisions used when creation file or using chmod", NewFilePerms},
+		"G302": {"Poor file permisions used when creation file or using chmod", NewFilePerms},
-		"G303": RuleDefinition{"Creating tempfile using a predictable path", NewBadTempFile},
+		"G303": {"Creating tempfile using a predictable path", NewBadTempFile},
 
 		// crypto
-		"G401": RuleDefinition{"Detect the usage of DES, RC4, or MD5", NewUsesWeakCryptography},
+		"G401": {"Detect the usage of DES, RC4, or MD5", NewUsesWeakCryptography},
-		"G402": RuleDefinition{"Look for bad TLS connection settings", NewIntermediateTLSCheck},
+		"G402": {"Look for bad TLS connection settings", NewIntermediateTLSCheck},
-		"G403": RuleDefinition{"Ensure minimum RSA key length of 2048 bits", NewWeakKeyStrength},
+		"G403": {"Ensure minimum RSA key length of 2048 bits", NewWeakKeyStrength},
-		"G404": RuleDefinition{"Insecure random number source (rand)", NewWeakRandCheck},
+		"G404": {"Insecure random number source (rand)", NewWeakRandCheck},
 
 		// blacklist
-		"G501": RuleDefinition{"Import blacklist: crypto/md5", NewBlacklistedImportMD5},
+		"G501": {"Import blacklist: crypto/md5", NewBlacklistedImportMD5},
-		"G502": RuleDefinition{"Import blacklist: crypto/des", NewBlacklistedImportDES},
+		"G502": {"Import blacklist: crypto/des", NewBlacklistedImportDES},
-		"G503": RuleDefinition{"Import blacklist: crypto/rc4", NewBlacklistedImportRC4},
+		"G503": {"Import blacklist: crypto/rc4", NewBlacklistedImportRC4},
-		"G504": RuleDefinition{"Import blacklist: net/http/cgi", NewBlacklistedImportCGI},
+		"G504": {"Import blacklist: net/http/cgi", NewBlacklistedImportCGI},
 	}
 
 	for rule := range rules {

rules/rules_test.go

@@ -65,6 +65,10 @@ var _ = Describe("gas rules", func() {
 			runner("G105", testutils.SampleCodeG105)
 		})
 
+		It("should detect of ssh.InsecureIgnoreHostKey function", func() {
+			runner("G106", testutils.SampleCodeG106)
+		})
+
 		It("should detect sql injection via format strings", func() {
 			runner("G201", testutils.SampleCodeG201)
 		})

rules/ssh.go

@@ -0,0 +1,33 @@
+package rules
+
+import (
+	"go/ast"
+
+	"github.com/GoASTScanner/gas"
+)
+
+type sshHostKey struct {
+	gas.MetaData
+	pkg   string
+	calls []string
+}
+
+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
+	}
+	return nil, nil
+}
+
+// NewSSHHostKey rule detects the use of insecure ssh HostKeyCallback.
+func NewSSHHostKey(conf gas.Config) (gas.Rule, []ast.Node) {
+	return &sshHostKey{
+		pkg:   "golang.org/x/crypto/ssh",
+		calls: []string{"InsecureIgnoreHostKey"},
+		MetaData: gas.MetaData{
+			What:       "Use of ssh InsecureIgnoreHostKey should be audited",
+			Severity:   gas.Medium,
+			Confidence: gas.High,
+		},
+	}, []ast.Node{(*ast.CallExpr)(nil)}
+}

rules/tls.go

@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+//go:generate tlsconfig
+
 package rules
 
 import (
@@ -106,7 +108,9 @@ func (t *insecureConfigTLS) processTLSConfVal(n *ast.KeyValueExpr, c *gas.Contex
 }
 
 func (t *insecureConfigTLS) Match(n ast.Node, c *gas.Context) (*gas.Issue, error) {
-	if complit, ok := n.(*ast.CompositeLit); ok && complit.Type != nil && c.Info.TypeOf(complit.Type).String() == t.requiredType {
+	if complit, ok := n.(*ast.CompositeLit); ok && complit.Type != nil {
+		actualType := c.Info.TypeOf(complit.Type)
+		if actualType != nil && actualType.String() == t.requiredType {
 			for _, elt := range complit.Elts {
 				if kve, ok := elt.(*ast.KeyValueExpr); ok {
 					issue := t.processTLSConfVal(kve, c)
@@ -116,76 +120,6 @@ func (t *insecureConfigTLS) Match(n ast.Node, c *gas.Context) (*gas.Issue, error
 				}
 			}
 		}
+	}
 	return nil, nil
 }
-
-// NewModernTLSCheck see: https://wiki.mozilla.org/Security/Server_Side_TLS#Modern_compatibility
-func NewModernTLSCheck(conf gas.Config) (gas.Rule, []ast.Node) {
-	return &insecureConfigTLS{
-		requiredType: "crypto/tls.Config",
-		MinVersion:   0x0303, // TLS 1.2 only
-		MaxVersion:   0x0303,
-		goodCiphers: []string{
-			"TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256",
-			"TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384",
-			"TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305",
-			"TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
-			"TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
-			"TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305",
-		},
-	}, []ast.Node{(*ast.CompositeLit)(nil)}
-}
-
-// NewIntermediateTLSCheck see: https://wiki.mozilla.org/Security/Server_Side_TLS#Intermediate_compatibility_.28default.29
-func NewIntermediateTLSCheck(conf gas.Config) (gas.Rule, []ast.Node) {
-	return &insecureConfigTLS{
-		requiredType: "crypto/tls.Config",
-		MinVersion:   0x0301, // TLS 1.2, 1.1, 1.0
-		MaxVersion:   0x0303,
-		goodCiphers: []string{
-			"TLS_RSA_WITH_AES_128_CBC_SHA",
-			"TLS_RSA_WITH_AES_256_CBC_SHA",
-			"TLS_RSA_WITH_AES_128_GCM_SHA256",
-			"TLS_RSA_WITH_AES_256_GCM_SHA384",
-			"TLS_ECDHE_ECDSA_WITH_RC4_128_SHA",
-			"TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA",
-			"TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA",
-			"TLS_ECDHE_RSA_WITH_RC4_128_SHA",
-			"TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA",
-			"TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA",
-			"TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA",
-			"TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
-			"TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256",
-			"TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
-			"TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384",
-		},
-	}, []ast.Node{(*ast.CompositeLit)(nil)}
-}
-
-// NewCompatTLSCheck see: https://wiki.mozilla.org/Security/Server_Side_TLS#Old_compatibility_.28default.29
-func NewCompatTLSCheck(conf gas.Config) (gas.Rule, []ast.Node) {
-	return &insecureConfigTLS{
-		requiredType: "crypto/tls.Config",
-		MinVersion:   0x0301, // TLS 1.2, 1.1, 1.0
-		MaxVersion:   0x0303,
-		goodCiphers: []string{
-			"TLS_RSA_WITH_RC4_128_SHA",
-			"TLS_RSA_WITH_3DES_EDE_CBC_SHA",
-			"TLS_RSA_WITH_AES_128_CBC_SHA",
-			"TLS_RSA_WITH_AES_256_CBC_SHA",
-			"TLS_RSA_WITH_AES_128_GCM_SHA256",
-			"TLS_RSA_WITH_AES_256_GCM_SHA384",
-			"TLS_ECDHE_ECDSA_WITH_RC4_128_SHA",
-			"TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA",
-			"TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA",
-			"TLS_ECDHE_RSA_WITH_RC4_128_SHA",
-			"TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA",
-			"TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA",
-			"TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA",
-			"TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
-			"TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256",
-			"TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
-			"TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384",
-		},
-	}, []ast.Node{(*ast.CompositeLit)(nil)}
-}

rules/tls_config.go

@@ -0,0 +1,132 @@
+package rules
+
+import (
+	"go/ast"
+
+	"github.com/GoASTScanner/gas"
+)
+
+// NewModernTLSCheck creates a check for Modern TLS ciphers
+// DO NOT EDIT - generated by tlsconfig tool
+func NewModernTLSCheck(conf gas.Config) (gas.Rule, []ast.Node) {
+	return &insecureConfigTLS{
+		requiredType: "crypto/tls.Config",
+		MinVersion:   0x0303,
+		MaxVersion:   0x0303,
+		goodCiphers: []string{
+			"TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384",
+			"TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
+			"TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256",
+			"TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
+			"TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384",
+			"TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384",
+			"TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256",
+			"TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256",
+		},
+	}, []ast.Node{(*ast.CompositeLit)(nil)}
+}
+
+// NewIntermediateTLSCheck creates a check for Intermediate TLS ciphers
+// DO NOT EDIT - generated by tlsconfig tool
+func NewIntermediateTLSCheck(conf gas.Config) (gas.Rule, []ast.Node) {
+	return &insecureConfigTLS{
+		requiredType: "crypto/tls.Config",
+		MinVersion:   0x0301,
+		MaxVersion:   0x0303,
+		goodCiphers: []string{
+			"TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256",
+			"TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
+			"TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384",
+			"TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
+			"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256",
+			"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384",
+			"TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256",
+			"TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256",
+			"TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA",
+			"TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384",
+			"TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA",
+			"TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384",
+			"TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA",
+			"TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA",
+			"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256",
+			"TLS_DHE_RSA_WITH_AES_128_CBC_SHA",
+			"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256",
+			"TLS_DHE_RSA_WITH_AES_256_CBC_SHA",
+			"TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA",
+			"TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA",
+			"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA",
+			"TLS_RSA_WITH_AES_128_GCM_SHA256",
+			"TLS_RSA_WITH_AES_256_GCM_SHA384",
+			"TLS_RSA_WITH_AES_128_CBC_SHA256",
+			"TLS_RSA_WITH_AES_256_CBC_SHA256",
+			"TLS_RSA_WITH_AES_128_CBC_SHA",
+			"TLS_RSA_WITH_AES_256_CBC_SHA",
+			"TLS_RSA_WITH_3DES_EDE_CBC_SHA",
+		},
+	}, []ast.Node{(*ast.CompositeLit)(nil)}
+}
+
+// NewOldTLSCheck creates a check for Old TLS ciphers
+// DO NOT EDIT - generated by tlsconfig tool
+func NewOldTLSCheck(conf gas.Config) (gas.Rule, []ast.Node) {
+	return &insecureConfigTLS{
+		requiredType: "crypto/tls.Config",
+		MinVersion:   0x0300,
+		MaxVersion:   0x0303,
+		goodCiphers: []string{
+			"TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
+			"TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256",
+			"TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
+			"TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384",
+			"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256",
+			"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256",
+			"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384",
+			"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384",
+			"TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256",
+			"TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256",
+			"TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA",
+			"TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA",
+			"TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384",
+			"TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384",
+			"TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA",
+			"TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA",
+			"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256",
+			"TLS_DHE_RSA_WITH_AES_128_CBC_SHA",
+			"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256",
+			"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256",
+			"TLS_DHE_DSS_WITH_AES_256_CBC_SHA",
+			"TLS_DHE_RSA_WITH_AES_256_CBC_SHA",
+			"TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA",
+			"TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA",
+			"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA",
+			"TLS_RSA_WITH_AES_128_GCM_SHA256",
+			"TLS_RSA_WITH_AES_256_GCM_SHA384",
+			"TLS_RSA_WITH_AES_128_CBC_SHA256",
+			"TLS_RSA_WITH_AES_256_CBC_SHA256",
+			"TLS_RSA_WITH_AES_128_CBC_SHA",
+			"TLS_RSA_WITH_AES_256_CBC_SHA",
+			"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256",
+			"TLS_DHE_DSS_WITH_AES_128_CBC_SHA",
+			"TLS_RSA_WITH_3DES_EDE_CBC_SHA",
+			"TLS_ECDHE_RSA_WITH_CAMELLIA_256_CBC_SHA384",
+			"TLS_ECDHE_ECDSA_WITH_CAMELLIA_256_CBC_SHA384",
+			"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA256",
+			"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA256",
+			"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA",
+			"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA",
+			"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA256",
+			"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA",
+			"TLS_ECDHE_RSA_WITH_CAMELLIA_128_CBC_SHA256",
+			"TLS_ECDHE_ECDSA_WITH_CAMELLIA_128_CBC_SHA256",
+			"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA256",
+			"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA256",
+			"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA",
+			"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA",
+			"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA256",
+			"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA",
+			"TLS_DHE_RSA_WITH_SEED_CBC_SHA",
+			"TLS_DHE_DSS_WITH_SEED_CBC_SHA",
+			"TLS_RSA_WITH_SEED_CBC_SHA",
+		},
+	}, []ast.Node{(*ast.CompositeLit)(nil)}
+}

testutils/pkg.go

@@ -128,6 +128,7 @@ func (p *TestPackage) CreateContext(filename string) *gas.Context {
 // Close will delete the package and all files in that directory
 func (p *TestPackage) Close() {
 	if p.ondisk {
-		os.RemoveAll(p.Path)
+		err := os.RemoveAll(p.Path)
+		log.Println(err)
 	}
 }

testutils/source.go

@@ -183,6 +183,15 @@ func main() {
     z = z.Exp(x, y, m)
 }`, 1}}
 
+	// SampleCodeG106 - ssh InsecureIgnoreHostKey
+	SampleCodeG106 = []CodeSample{{`
+package main
+import (
+        "golang.org/x/crypto/ssh"
+)
+func main() {
+        _ =  ssh.InsecureIgnoreHostKey()
+}`, 1}}
 	// SampleCodeG201 - SQL injection via format string
 	SampleCodeG201 = []CodeSample{
 		{`