mirror of
https://github.com/securego/gosec.git
synced 2024-12-26 04:25:52 +00:00
92 lines
2.9 KiB
Go
92 lines
2.9 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 (
|
||
|
|
"fmt"
|
||
|
|
"github.com/securego/gosec"
|
||
|
|
"go/ast"
|
||
|
|
)
|
||
|
|
|
||
|
|
type integerOverflowCheck struct {
|
||
|
|
gosec.MetaData
|
||
|
|
calls gosec.CallList
|
||
|
|
}
|
||
|
|
|
||
|
|
func (i *integerOverflowCheck) ID() string {
|
||
|
|
return i.MetaData.ID
|
||
|
|
}
|
||
|
|
|
||
|
|
func (i *integerOverflowCheck) Match(node ast.Node, ctx *gosec.Context) (*gosec.Issue, error) {
|
||
|
|
var atoiVarName map[string]ast.Node
|
||
|
|
|
||
|
|
// To check multiple lines, ctx.PassedValues is used to store temporary data.
|
||
|
|
if _, ok := ctx.PassedValues[i.ID()]; !ok {
|
||
|
|
atoiVarName = make(map[string]ast.Node)
|
||
|
|
ctx.PassedValues[i.ID()] = atoiVarName
|
||
|
|
} else if pv, ok := ctx.PassedValues[i.ID()].(map[string]ast.Node); ok {
|
||
|
|
atoiVarName = pv
|
||
|
|
} else {
|
||
|
|
return nil, fmt.Errorf("PassedValues[%s] of Context is not map[string]ast.Node, but %T", i.ID(), ctx.PassedValues[i.ID()])
|
||
|
|
}
|
||
|
|
|
||
|
|
// strconv.Atoi is a common function.
|
||
|
|
// To reduce false positives, This rule detects code which is converted to int32/int16 only.
|
||
|
|
switch n := node.(type) {
|
||
|
|
case *ast.FuncDecl:
|
||
|
|
// Clear atoiVarName by function
|
||
|
|
ctx.PassedValues[i.ID()] = make(map[string]ast.Node)
|
||
|
|
case *ast.AssignStmt:
|
||
|
|
for _, expr := range n.Rhs {
|
||
|
|
if callExpr, ok := expr.(*ast.CallExpr); ok && i.calls.ContainsCallExpr(callExpr, ctx, false) != nil {
|
||
|
|
if idt, ok := n.Lhs[0].(*ast.Ident); ok && idt.Name != "_" {
|
||
|
|
// Example:
|
||
|
|
// v, _ := strconv.Atoi("1111")
|
||
|
|
// Add "v" to atoiVarName map
|
||
|
|
atoiVarName[idt.Name] = n
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
case *ast.CallExpr:
|
||
|
|
if fun, ok := n.Fun.(*ast.Ident); ok {
|
||
|
|
if fun.Name == "int32" || fun.Name == "int16" {
|
||
|
|
if idt, ok := n.Args[0].(*ast.Ident); ok {
|
||
|
|
if n, ok := atoiVarName[idt.Name]; ok {
|
||
|
|
// Detect int32(v) and int16(v)
|
||
|
|
return gosec.NewIssue(ctx, n, i.ID(), i.What, i.Severity, i.Confidence), nil
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return nil, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// NewIntegerOverflowCheck detects if there is potential Integer OverFlow
|
||
|
|
func NewIntegerOverflowCheck(id string, conf gosec.Config) (gosec.Rule, []ast.Node) {
|
||
|
|
calls := gosec.NewCallList()
|
||
|
|
calls.Add("strconv", "Atoi")
|
||
|
|
return &integerOverflowCheck{
|
||
|
|
MetaData: gosec.MetaData{
|
||
|
|
ID: id,
|
||
|
|
Severity: gosec.High,
|
||
|
|
Confidence: gosec.Medium,
|
||
|
|
What: "Potential Integer overflow made by strconv.Atoi result conversion to int16/32",
|
||
|
|
},
|
||
|
|
calls: calls,
|
||
|
|
}, []ast.Node{(*ast.FuncDecl)(nil), (*ast.AssignStmt)(nil), (*ast.CallExpr)(nil)}
|
||
|
|
}
|