84 lines
2.5 KiB
Go
84 lines
2.5 KiB
Go
// (c) Copyright 2016 Hewlett Packard Enterprise Development LP
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package rules
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import (
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"go/ast"
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"regexp"
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"github.com/securego/gosec"
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)
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// Looks for net.Listen("0.0.0.0") or net.Listen(":8080")
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type bindsToAllNetworkInterfaces struct {
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gosec.MetaData
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calls gosec.CallList
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pattern *regexp.Regexp
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}
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func (r *bindsToAllNetworkInterfaces) ID() string {
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return r.MetaData.ID
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}
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func (r *bindsToAllNetworkInterfaces) Match(n ast.Node, c *gosec.Context) (*gosec.Issue, error) {
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callExpr := r.calls.ContainsCallExpr(n, c, false)
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if callExpr == nil {
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return nil, nil
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}
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if len(callExpr.Args) > 1 {
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arg := callExpr.Args[1]
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if bl, ok := arg.(*ast.BasicLit); ok {
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if arg, err := gosec.GetString(bl); err == nil {
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if r.pattern.MatchString(arg) {
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return gosec.NewIssue(c, n, r.ID(), r.What, r.Severity, r.Confidence), nil
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}
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}
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} else if ident, ok := arg.(*ast.Ident); ok {
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values := gosec.GetIdentStringValues(ident)
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for _, value := range values {
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if r.pattern.MatchString(value) {
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return gosec.NewIssue(c, n, r.ID(), r.What, r.Severity, r.Confidence), nil
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}
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}
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}
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} else if len(callExpr.Args) > 0 {
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values := gosec.GetCallStringArgsValues(callExpr.Args[0], c)
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for _, value := range values {
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if r.pattern.MatchString(value) {
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return gosec.NewIssue(c, n, r.ID(), r.What, r.Severity, r.Confidence), nil
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}
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}
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}
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return nil, nil
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}
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// NewBindsToAllNetworkInterfaces detects socket connections that are setup to
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// listen on all network interfaces.
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func NewBindsToAllNetworkInterfaces(id string, conf gosec.Config) (gosec.Rule, []ast.Node) {
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calls := gosec.NewCallList()
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calls.Add("net", "Listen")
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calls.Add("crypto/tls", "Listen")
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return &bindsToAllNetworkInterfaces{
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calls: calls,
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pattern: regexp.MustCompile(`^(0.0.0.0|:).*$`),
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MetaData: gosec.MetaData{
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ID: id,
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Severity: gosec.Medium,
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Confidence: gosec.High,
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What: "Binds to all network interfaces",
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},
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}, []ast.Node{(*ast.CallExpr)(nil)}
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}
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