go.mod: vendor golangci-lint

1 files changed, 109 insertions, 0 deletions

diff --git a/vendor/github.com/securego/gosec/v2/rules/decompression-bomb.go b/vendor/github.com/securego/gosec/v2/rules/decompression-bomb.go
new file mode 100644
index 000000000..bfc589763
--- /dev/null
+++ b/vendor/github.com/securego/gosec/v2/rules/decompression-bomb.go
@@ -0,0 +1,109 @@
+// (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"
+	"go/ast"
+
+	"github.com/securego/gosec/v2"
+)
+
+type decompressionBombCheck struct {
+	gosec.MetaData
+	readerCalls gosec.CallList
+	copyCalls   gosec.CallList
+}
+
+func (d *decompressionBombCheck) ID() string {
+	return d.MetaData.ID
+}
+
+func containsReaderCall(node ast.Node, ctx *gosec.Context, list gosec.CallList) bool {
+	if list.ContainsPkgCallExpr(node, ctx, false) != nil {
+		return true
+	}
+	// Resolve type info of ident (for *archive/zip.File.Open)
+	s, idt, _ := gosec.GetCallInfo(node, ctx)
+	return list.Contains(s, idt)
+}
+
+func (d *decompressionBombCheck) Match(node ast.Node, ctx *gosec.Context) (*gosec.Issue, error) {
+	var readerVarObj map[*ast.Object]struct{}
+
+	// To check multiple lines, ctx.PassedValues is used to store temporary data.
+	if _, ok := ctx.PassedValues[d.ID()]; !ok {
+		readerVarObj = make(map[*ast.Object]struct{})
+		ctx.PassedValues[d.ID()] = readerVarObj
+	} else if pv, ok := ctx.PassedValues[d.ID()].(map[*ast.Object]struct{}); ok {
+		readerVarObj = pv
+	} else {
+		return nil, fmt.Errorf("PassedValues[%s] of Context is not map[*ast.Object]struct{}, but %T", d.ID(), ctx.PassedValues[d.ID()])
+	}
+
+	// io.Copy is a common function.
+	// To reduce false positives, This rule detects code which is used for compressed data only.
+	switch n := node.(type) {
+	case *ast.AssignStmt:
+		for _, expr := range n.Rhs {
+			if callExpr, ok := expr.(*ast.CallExpr); ok && containsReaderCall(callExpr, ctx, d.readerCalls) {
+				if idt, ok := n.Lhs[0].(*ast.Ident); ok && idt.Name != "_" {
+					// Example:
+					//  r, _ := zlib.NewReader(buf)
+					//  Add r's Obj to readerVarObj map
+					readerVarObj[idt.Obj] = struct{}{}
+				}
+			}
+		}
+	case *ast.CallExpr:
+		if d.copyCalls.ContainsPkgCallExpr(n, ctx, false) != nil {
+			if idt, ok := n.Args[1].(*ast.Ident); ok {
+				if _, ok := readerVarObj[idt.Obj]; ok {
+					// Detect io.Copy(x, r)
+					return gosec.NewIssue(ctx, n, d.ID(), d.What, d.Severity, d.Confidence), nil
+				}
+			}
+		}
+	}
+
+	return nil, nil
+}
+
+// NewDecompressionBombCheck detects if there is potential DoS vulnerability via decompression bomb
+func NewDecompressionBombCheck(id string, conf gosec.Config) (gosec.Rule, []ast.Node) {
+	readerCalls := gosec.NewCallList()
+	readerCalls.Add("compress/gzip", "NewReader")
+	readerCalls.AddAll("compress/zlib", "NewReader", "NewReaderDict")
+	readerCalls.Add("compress/bzip2", "NewReader")
+	readerCalls.AddAll("compress/flate", "NewReader", "NewReaderDict")
+	readerCalls.Add("compress/lzw", "NewReader")
+	readerCalls.Add("archive/tar", "NewReader")
+	readerCalls.Add("archive/zip", "NewReader")
+	readerCalls.Add("*archive/zip.File", "Open")
+
+	copyCalls := gosec.NewCallList()
+	copyCalls.Add("io", "Copy")
+
+	return &decompressionBombCheck{
+		MetaData: gosec.MetaData{
+			ID:         id,
+			Severity:   gosec.Medium,
+			Confidence: gosec.Medium,
+			What:       "Potential DoS vulnerability via decompression bomb",
+		},
+		readerCalls: readerCalls,
+		copyCalls:   copyCalls,
+	}, []ast.Node{(*ast.FuncDecl)(nil), (*ast.AssignStmt)(nil), (*ast.CallExpr)(nil)}
+}