mirror of
https://github.com/aquasecurity/kube-bench.git
synced 2024-12-24 07:28:06 +00:00
278 lines
7.5 KiB
Go
278 lines
7.5 KiB
Go
// Copyright © 2017 Aqua Security Software Ltd. <info@aquasec.com>
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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 cmd
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import (
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"bufio"
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"strings"
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"github.com/aquasecurity/kube-bench/check"
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"github.com/golang/glog"
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"github.com/spf13/viper"
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)
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// NewRunFilter constructs a Predicate based on FilterOpts which determines whether tested Checks should be run or not.
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func NewRunFilter(opts FilterOpts) (check.Predicate, error) {
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if opts.CheckList != "" && opts.GroupList != "" {
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return nil, fmt.Errorf("group option and check option can't be used together")
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}
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var groupIDs map[string]bool
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if opts.GroupList != "" {
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groupIDs = cleanIDs(opts.GroupList)
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}
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var checkIDs map[string]bool
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if opts.CheckList != "" {
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checkIDs = cleanIDs(opts.CheckList)
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}
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return func(g *check.Group, c *check.Check) bool {
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var test = true
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if len(groupIDs) > 0 {
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_, ok := groupIDs[g.ID]
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test = test && ok
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}
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if len(checkIDs) > 0 {
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_, ok := checkIDs[c.ID]
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test = test && ok
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}
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test = test && (opts.Scored && c.Scored || opts.Unscored && !c.Scored)
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return test
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}, nil
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}
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func runChecks(nodetype check.NodeType) {
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var summary check.Summary
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def := loadConfig(nodetype)
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in, err := ioutil.ReadFile(def)
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if err != nil {
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exitWithError(fmt.Errorf("error opening %s controls file: %v", nodetype, err))
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}
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glog.V(1).Info(fmt.Sprintf("Using benchmark file: %s\n", def))
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// Get the set of executables and config files we care about on this type of node.
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typeConf := viper.Sub(string(nodetype))
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binmap, err := getBinaries(typeConf)
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// Checks that the executables we need for the node type are running.
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if err != nil {
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exitWithError(err)
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}
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confmap := getConfigFiles(typeConf)
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svcmap := getServiceFiles(typeConf)
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kubeconfmap := getKubeConfigFiles(typeConf)
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// Variable substitutions. Replace all occurrences of variables in controls files.
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s := string(in)
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s = makeSubstitutions(s, "bin", binmap)
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s = makeSubstitutions(s, "conf", confmap)
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s = makeSubstitutions(s, "svc", svcmap)
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s = makeSubstitutions(s, "kubeconfig", kubeconfmap)
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controls, err := check.NewControls(nodetype, []byte(s))
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if err != nil {
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exitWithError(fmt.Errorf("error setting up %s controls: %v", nodetype, err))
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}
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runner := check.NewRunner()
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filter, err := NewRunFilter(filterOpts)
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if err != nil {
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exitWithError(fmt.Errorf("error setting up run filter: %v", err))
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}
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summary = controls.RunChecks(runner, filter)
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// if we successfully ran some tests and it's json format, ignore the warnings
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if (summary.Fail > 0 || summary.Warn > 0 || summary.Pass > 0 || summary.Info > 0) && jsonFmt {
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out, err := controls.JSON()
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if err != nil {
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exitWithError(fmt.Errorf("failed to output in JSON format: %v", err))
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}
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PrintOutput(string(out), outputFile)
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} else {
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// if we want to store in PostgreSQL, convert to JSON and save it
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if (summary.Fail > 0 || summary.Warn > 0 || summary.Pass > 0 || summary.Info > 0) && pgSQL {
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out, err := controls.JSON()
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if err != nil {
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exitWithError(fmt.Errorf("failed to output in JSON format: %v", err))
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}
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savePgsql(string(out))
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} else {
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prettyPrint(controls, summary)
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}
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}
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}
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// colorPrint outputs the state in a specific colour, along with a message string
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func colorPrint(state check.State, s string) {
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colors[state].Printf("[%s] ", state)
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fmt.Printf("%s", s)
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}
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// prettyPrint outputs the results to stdout in human-readable format
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func prettyPrint(r *check.Controls, summary check.Summary) {
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// Print check results.
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if !noResults {
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colorPrint(check.INFO, fmt.Sprintf("%s %s\n", r.ID, r.Text))
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for _, g := range r.Groups {
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colorPrint(check.INFO, fmt.Sprintf("%s %s\n", g.ID, g.Text))
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for _, c := range g.Checks {
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colorPrint(c.State, fmt.Sprintf("%s %s\n", c.ID, c.Text))
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if includeTestOutput && c.State == check.FAIL && len(c.ActualValue) > 0 {
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printRawOutput(c.ActualValue)
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}
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}
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}
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fmt.Println()
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}
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// Print remediations.
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if !noRemediations {
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if summary.Fail > 0 || summary.Warn > 0 {
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colors[check.WARN].Printf("== Remediations ==\n")
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for _, g := range r.Groups {
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for _, c := range g.Checks {
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if c.State == check.FAIL || c.State == check.WARN {
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fmt.Printf("%s %s\n", c.ID, c.Remediation)
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}
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}
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}
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fmt.Println()
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}
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}
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// Print summary setting output color to highest severity.
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if !noSummary {
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var res check.State
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if summary.Fail > 0 {
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res = check.FAIL
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} else if summary.Warn > 0 {
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res = check.WARN
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} else {
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res = check.PASS
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}
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colors[res].Printf("== Summary ==\n")
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fmt.Printf("%d checks PASS\n%d checks FAIL\n%d checks WARN\n%d checks INFO\n",
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summary.Pass, summary.Fail, summary.Warn, summary.Info,
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)
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}
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}
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// loadConfig finds the correct config dir based on the kubernetes version,
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// merges any specific config.yaml file found with the main config
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// and returns the benchmark file to use.
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func loadConfig(nodetype check.NodeType) string {
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var file string
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var err error
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switch nodetype {
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case check.MASTER:
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file = masterFile
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case check.NODE:
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file = nodeFile
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case check.FEDERATED:
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file = federatedFile
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}
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runningVersion := ""
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if kubeVersion == "" {
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runningVersion, err = getKubeVersion()
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if err != nil {
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exitWithError(fmt.Errorf("Version check failed: %s\nAlternatively, you can specify the version with --version", err))
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}
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}
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path, err := getConfigFilePath(kubeVersion, runningVersion, file)
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if err != nil {
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exitWithError(fmt.Errorf("can't find %s controls file in %s: %v", nodetype, cfgDir, err))
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}
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// Merge kubernetes version specific config if any.
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viper.SetConfigFile(path + "/config.yaml")
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err = viper.MergeInConfig()
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if err != nil {
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if os.IsNotExist(err) {
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glog.V(2).Info(fmt.Sprintf("No version-specific config.yaml file in %s", path))
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} else {
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exitWithError(fmt.Errorf("couldn't read config file %s: %v", path+"/config.yaml", err))
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}
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} else {
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glog.V(1).Info(fmt.Sprintf("Using config file: %s\n", viper.ConfigFileUsed()))
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}
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return filepath.Join(path, file)
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}
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// isMaster verify if master components are running on the node.
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func isMaster() bool {
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glog.V(2).Info("Checking if the current node is running master components")
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masterConf := viper.Sub(string(check.MASTER))
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components, err := getBinaries(masterConf)
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if err != nil {
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glog.V(2).Info(err)
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return false
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}
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if len(components) == 0 {
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glog.V(2).Info("No master binaries specified")
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return false
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}
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return true
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}
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func printRawOutput(output string) {
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for _, row := range strings.Split(output, "\n") {
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fmt.Println(fmt.Sprintf("\t %s", row))
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}
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}
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func writeOutputToFile(output string, outputFile string) error {
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file, err := os.Create(outputFile)
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if err != nil {
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return err
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}
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defer file.Close()
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w := bufio.NewWriter(file)
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fmt.Fprintln(w, output)
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return w.Flush()
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}
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func PrintOutput(output string, outputFile string) {
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if len(outputFile) == 0 {
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fmt.Println(output)
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} else {
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err := writeOutputToFile(output, outputFile)
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if err != nil {
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exitWithError(fmt.Errorf("Failed to write to output file %s: %v", outputFile, err))
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}
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}
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}
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