mirror of
https://github.com/securego/gosec.git
synced 2024-11-05 19:45:51 +00:00
135 lines
3.7 KiB
Go
135 lines
3.7 KiB
Go
// (c) Copyright 2016 Hewlett Packard Enterprise Development LP
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package rules
|
|
|
|
import (
|
|
"go/ast"
|
|
"regexp"
|
|
|
|
"github.com/securego/gosec"
|
|
)
|
|
|
|
type sqlStatement struct {
|
|
gosec.MetaData
|
|
|
|
// Contains a list of patterns which must all match for the rule to match.
|
|
patterns []*regexp.Regexp
|
|
}
|
|
|
|
func (s *sqlStatement) ID() string {
|
|
return s.MetaData.ID
|
|
}
|
|
|
|
// See if the string matches the patterns for the statement.
|
|
func (s *sqlStatement) MatchPatterns(str string) bool {
|
|
for _, pattern := range s.patterns {
|
|
if !pattern.MatchString(str) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
type sqlStrConcat struct {
|
|
sqlStatement
|
|
}
|
|
|
|
func (s *sqlStrConcat) ID() string {
|
|
return s.MetaData.ID
|
|
}
|
|
|
|
// see if we can figure out what it is
|
|
func (s *sqlStrConcat) checkObject(n *ast.Ident) bool {
|
|
if n.Obj != nil {
|
|
return n.Obj.Kind != ast.Var && n.Obj.Kind != ast.Fun
|
|
}
|
|
return false
|
|
}
|
|
|
|
// Look for "SELECT * FROM table WHERE " + " ' OR 1=1"
|
|
func (s *sqlStrConcat) Match(n ast.Node, c *gosec.Context) (*gosec.Issue, error) {
|
|
if node, ok := n.(*ast.BinaryExpr); ok {
|
|
if start, ok := node.X.(*ast.BasicLit); ok {
|
|
if str, e := gosec.GetString(start); e == nil {
|
|
if !s.MatchPatterns(str) {
|
|
return nil, nil
|
|
}
|
|
if _, ok := node.Y.(*ast.BasicLit); ok {
|
|
return nil, nil // string cat OK
|
|
}
|
|
if second, ok := node.Y.(*ast.Ident); ok && s.checkObject(second) {
|
|
return nil, nil
|
|
}
|
|
return gosec.NewIssue(c, n, s.ID(), s.What, s.Severity, s.Confidence), nil
|
|
}
|
|
}
|
|
}
|
|
return nil, nil
|
|
}
|
|
|
|
// NewSQLStrConcat looks for cases where we are building SQL strings via concatenation
|
|
func NewSQLStrConcat(id string, conf gosec.Config) (gosec.Rule, []ast.Node) {
|
|
return &sqlStrConcat{
|
|
sqlStatement: sqlStatement{
|
|
patterns: []*regexp.Regexp{
|
|
regexp.MustCompile(`(?)(SELECT|DELETE|INSERT|UPDATE|INTO|FROM|WHERE) `),
|
|
},
|
|
MetaData: gosec.MetaData{
|
|
ID: id,
|
|
Severity: gosec.Medium,
|
|
Confidence: gosec.High,
|
|
What: "SQL string concatenation",
|
|
},
|
|
},
|
|
}, []ast.Node{(*ast.BinaryExpr)(nil)}
|
|
}
|
|
|
|
type sqlStrFormat struct {
|
|
sqlStatement
|
|
calls gosec.CallList
|
|
}
|
|
|
|
// Looks for "fmt.Sprintf("SELECT * FROM foo where '%s', userInput)"
|
|
func (s *sqlStrFormat) Match(n ast.Node, c *gosec.Context) (*gosec.Issue, error) {
|
|
|
|
// TODO(gm) improve confidence if database/sql is being used
|
|
if node := s.calls.ContainsCallExpr(n, c); node != nil {
|
|
if arg, e := gosec.GetString(node.Args[0]); s.MatchPatterns(arg) && e == nil {
|
|
return gosec.NewIssue(c, n, s.ID(), s.What, s.Severity, s.Confidence), nil
|
|
}
|
|
}
|
|
return nil, nil
|
|
}
|
|
|
|
// NewSQLStrFormat looks for cases where we're building SQL query strings using format strings
|
|
func NewSQLStrFormat(id string, conf gosec.Config) (gosec.Rule, []ast.Node) {
|
|
rule := &sqlStrFormat{
|
|
calls: gosec.NewCallList(),
|
|
sqlStatement: sqlStatement{
|
|
patterns: []*regexp.Regexp{
|
|
regexp.MustCompile("(?)(SELECT|DELETE|INSERT|UPDATE|INTO|FROM|WHERE) "),
|
|
regexp.MustCompile("%[^bdoxXfFp]"),
|
|
},
|
|
MetaData: gosec.MetaData{
|
|
ID: id,
|
|
Severity: gosec.Medium,
|
|
Confidence: gosec.High,
|
|
What: "SQL string formatting",
|
|
},
|
|
},
|
|
}
|
|
rule.calls.AddAll("fmt", "Sprint", "Sprintf", "Sprintln")
|
|
return rule, []ast.Node{(*ast.CallExpr)(nil)}
|
|
}
|