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aecbc873ef
By allowing partial matches of selectors there are chances of collisions such as those in issue #145, this removes it to expect explicit packages for each rule. Closes #145
53 lines
1.5 KiB
Go
53 lines
1.5 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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"fmt"
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"go/ast"
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"github.com/GoASTScanner/gas"
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)
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type weakKeyStrength struct {
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gas.MetaData
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calls gas.CallList
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bits int
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}
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func (w *weakKeyStrength) Match(n ast.Node, c *gas.Context) (*gas.Issue, error) {
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if callExpr := w.calls.ContainsCallExpr(n, c); callExpr != nil {
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if bits, err := gas.GetInt(callExpr.Args[1]); err == nil && bits < (int64)(w.bits) {
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return gas.NewIssue(c, n, w.What, w.Severity, w.Confidence), nil
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}
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}
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return nil, nil
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}
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// NewWeakKeyStrength builds a rule that detects RSA keys < 2048 bits
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func NewWeakKeyStrength(conf gas.Config) (gas.Rule, []ast.Node) {
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calls := gas.NewCallList()
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calls.Add("crypto/rsa", "GenerateKey")
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bits := 2048
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return &weakKeyStrength{
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calls: calls,
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bits: bits,
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MetaData: gas.MetaData{
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Severity: gas.Medium,
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Confidence: gas.High,
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What: fmt.Sprintf("RSA keys should be at least %d bits", bits),
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},
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}, []ast.Node{(*ast.CallExpr)(nil)}
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}
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