Reset the state of TLS rule after each version check (#570)

Signed-off-by: Cosmin Cojocar <[email protected]>

Author: ccojocar

go.sum

@@ -369,6 +369,7 @@ golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550 h1:ObdrDkeb4kJdCP557AjRjq
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9 h1:psW17arqaxU48Z5kZ0CQnkZWQJsqcURM6tKiBApRjXI=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad h1:DN0cp81fZ3njFcrLCytUHRSUkqBjfTo4Tx9RJTWs0EY=
 golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=

rules/tls.go

@@ -146,6 +146,11 @@ func (t *insecureConfigTLS) checkVersion(n ast.Node, c *gosec.Context) *gosec.Is
 	return nil
 }
 
+func (t *insecureConfigTLS) resetVersion() {
+	t.actualMaxVersion = 0
+	t.actualMinVersion = 0
+}
+
 func (t *insecureConfigTLS) Match(n ast.Node, c *gosec.Context) (*gosec.Issue, error) {
 	if complit, ok := n.(*ast.CompositeLit); ok && complit.Type != nil {
 		actualType := c.Info.TypeOf(complit.Type)
@@ -158,7 +163,9 @@ func (t *insecureConfigTLS) Match(n ast.Node, c *gosec.Context) (*gosec.Issue, e
 					}
 				}
 			}
-			return t.checkVersion(complit, c), nil
+			issue := t.checkVersion(complit, c)
+			t.resetVersion()
+			return issue, nil
 		}
 	}
 	return nil, nil

testutils/source.go

@@ -2057,7 +2057,24 @@ func main() {
 	if err != nil {
 		fmt.Println(err)
 	}
-}`}, 0, gosec.NewConfig()}}
+}`}, 0, gosec.NewConfig()}, {[]string{`
+package p0
+
+import "crypto/tls"
+
+func TlsConfig0() *tls.Config {
+	var v uint16 = 0
+	return &tls.Config{MinVersion: v}
+}
+`, `
+package p0
+
+import "crypto/tls"
+
+func TlsConfig1() *tls.Config {
+   return &tls.Config{MinVersion: 0x0304}
+}
+`}, 1, gosec.NewConfig()}}
 
 	// SampleCodeG403 - weak key strength
 	SampleCodeG403 = []CodeSample{