mirror of
https://github.com/securego/gosec.git
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102 lines
2.8 KiB
Go
102 lines
2.8 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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"go/types"
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gas "github.com/GoASTScanner/gas/core"
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)
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type NoErrorCheck struct {
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gas.MetaData
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whitelist gas.CallList
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}
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func (r *NoErrorCheck) ID() string {
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return r.MetaData.ID
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}
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func returnsError(callExpr *ast.CallExpr, ctx *gas.Context) int {
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if tv := ctx.Info.TypeOf(callExpr); tv != nil {
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switch t := tv.(type) {
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case *types.Tuple:
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for pos := 0; pos < t.Len(); pos += 1 {
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variable := t.At(pos)
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if variable != nil && variable.Type().String() == "error" {
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return pos
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}
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}
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case *types.Named:
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if t.String() == "error" {
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return 0
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}
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}
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}
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return -1
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}
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func (r *NoErrorCheck) Match(n ast.Node, ctx *gas.Context) (*gas.Issue, error) {
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switch stmt := n.(type) {
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case *ast.AssignStmt:
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for _, expr := range stmt.Rhs {
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if callExpr, ok := expr.(*ast.CallExpr); ok && !r.whitelist.ContainsCallExpr(callExpr, ctx) {
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pos := returnsError(callExpr, ctx)
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if pos < 0 || pos >= len(stmt.Lhs) {
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return nil, nil
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}
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if id, ok := stmt.Lhs[pos].(*ast.Ident); ok && id.Name == "_" {
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return gas.NewIssue(ctx, n, r.What, r.Severity, r.Confidence), nil
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}
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}
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}
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case *ast.ExprStmt:
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if callExpr, ok := stmt.X.(*ast.CallExpr); ok && !r.whitelist.ContainsCallExpr(callExpr, ctx) {
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pos := returnsError(callExpr, ctx)
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if pos >= 0 {
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return gas.NewIssue(ctx, n, 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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func NewNoErrorCheck(id string, conf map[string]interface{}) (gas.Rule, []ast.Node) {
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// TODO(gm) Come up with sensible defaults here. Or flip it to use a
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// black list instead.
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whitelist := gas.NewCallList()
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whitelist.AddAll("bytes.Buffer", "Write", "WriteByte", "WriteRune", "WriteString")
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whitelist.AddAll("fmt", "Print", "Printf", "Println")
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whitelist.Add("io.PipeWriter", "CloseWithError")
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if configured, ok := conf["G104"]; ok {
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if whitelisted, ok := configured.(map[string][]string); ok {
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for key, val := range whitelisted {
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whitelist.AddAll(key, val...)
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}
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}
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}
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return &NoErrorCheck{
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MetaData: gas.MetaData{
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ID: id,
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Severity: gas.Low,
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Confidence: gas.High,
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What: "Errors unhandled.",
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},
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whitelist: whitelist,
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}, []ast.Node{(*ast.AssignStmt)(nil), (*ast.ExprStmt)(nil)}
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}
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