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kube-bench/check/test.go
Liz Rice cd231106cc
Improve comment
Tests could easily be marked "skip" because the user doesn't want to run them in their environment, and in this common case the set of tests will be non-nil
2019-02-18 08:46:26 +00:00

201 lines
4.3 KiB
Go

// Copyright © 2017 Aqua Security Software Ltd. <info@aquasec.com>
//
// 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 check
import (
"fmt"
"os"
"regexp"
"strconv"
"strings"
)
// test:
// flag: OPTION
// set: (true|false)
// compare:
// op: (eq|gt|gte|lt|lte|has)
// value: val
type binOp string
const (
and binOp = "and"
or = "or"
)
type testItem struct {
Flag string
Output string
Value string
Set bool
Compare compare
}
type compare struct {
Op string
Value string
}
type testOutput struct {
testResult bool
actualResult string
}
func (t *testItem) execute(s string) *testOutput {
result := &testOutput{}
match := strings.Contains(s, t.Flag)
if t.Set {
var flagVal string
isset := match
if isset && t.Compare.Op != "" {
// Expects flags in the form;
// --flag=somevalue
// --flag
// somevalue
//pttn := `(` + t.Flag + `)(=)*([^\s,]*) *`
pttn := `(` + t.Flag + `)(=)*([^\s]*) *`
flagRe := regexp.MustCompile(pttn)
vals := flagRe.FindStringSubmatch(s)
if len(vals) > 0 {
if vals[3] != "" {
flagVal = vals[3]
} else {
flagVal = vals[1]
}
} else {
fmt.Fprintf(os.Stderr, "invalid flag in testitem definition")
os.Exit(1)
}
result.actualResult = strings.ToLower(flagVal)
switch t.Compare.Op {
case "eq":
value := strings.ToLower(flagVal)
// Do case insensitive comparaison for booleans ...
if value == "false" || value == "true" {
result.testResult = value == t.Compare.Value
} else {
result.testResult = flagVal == t.Compare.Value
}
case "noteq":
value := strings.ToLower(flagVal)
// Do case insensitive comparaison for booleans ...
if value == "false" || value == "true" {
result.testResult = !(value == t.Compare.Value)
} else {
result.testResult = !(flagVal == t.Compare.Value)
}
case "gt":
a, b := toNumeric(flagVal, t.Compare.Value)
result.testResult = a > b
case "gte":
a, b := toNumeric(flagVal, t.Compare.Value)
result.testResult = a >= b
case "lt":
a, b := toNumeric(flagVal, t.Compare.Value)
result.testResult = a < b
case "lte":
a, b := toNumeric(flagVal, t.Compare.Value)
result.testResult = a <= b
case "has":
result.testResult = strings.Contains(flagVal, t.Compare.Value)
case "nothave":
result.testResult = !strings.Contains(flagVal, t.Compare.Value)
}
} else {
result.testResult = isset
}
} else {
notset := !match
result.testResult = notset
}
return result
}
type tests struct {
TestItems []*testItem `yaml:"test_items"`
BinOp binOp `yaml:"bin_op"`
}
func (ts *tests) execute(s string) *testOutput {
finalOutput := &testOutput{}
// If no tests are defined return with empty finalOutput.
// This may be the case for checks of type: "skip".
if ts == nil {
return finalOutput
}
res := make([]testOutput, len(ts.TestItems))
if len(res) == 0 {
return finalOutput
}
for i, t := range ts.TestItems {
res[i] = *(t.execute(s))
}
var result bool
// If no binary operation is specified, default to AND
switch ts.BinOp {
default:
fmt.Fprintf(os.Stderr, "unknown binary operator for tests %s\n", ts.BinOp)
os.Exit(1)
case and, "":
result = true
for i := range res {
result = result && res[i].testResult
}
case or:
result = false
for i := range res {
result = result || res[i].testResult
}
}
finalOutput.testResult = result
finalOutput.actualResult = res[0].actualResult
return finalOutput
}
func toNumeric(a, b string) (c, d int) {
var err error
c, err = strconv.Atoi(a)
if err != nil {
fmt.Fprintf(os.Stderr, "error converting %s: %s\n", a, err)
os.Exit(1)
}
d, err = strconv.Atoi(b)
if err != nil {
fmt.Fprintf(os.Stderr, "error converting %s: %s\n", b, err)
os.Exit(1)
}
return c, d
}