2017-07-13 00:24:09 +00:00
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package cmd
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import (
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"fmt"
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"os"
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"os/exec"
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2017-08-11 16:59:57 +00:00
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"regexp"
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2017-07-13 00:24:09 +00:00
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"strings"
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"github.com/aquasecurity/kube-bench/check"
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"github.com/fatih/color"
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2017-07-25 00:34:07 +00:00
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"github.com/golang/glog"
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2017-07-13 00:24:09 +00:00
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)
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var (
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// Print colors
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colors = map[check.State]*color.Color{
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check.PASS: color.New(color.FgGreen),
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check.FAIL: color.New(color.FgRed),
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check.WARN: color.New(color.FgYellow),
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check.INFO: color.New(color.FgBlue),
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}
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)
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2017-08-06 16:59:03 +00:00
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func printlnWarn(msg string) {
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2017-07-25 00:34:07 +00:00
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fmt.Fprintf(os.Stderr, "[%s] %s\n",
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colors[check.WARN].Sprintf("%s", check.WARN),
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msg,
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)
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}
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2017-08-06 16:59:03 +00:00
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func sprintlnWarn(msg string) string {
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2017-07-25 00:34:07 +00:00
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return fmt.Sprintf("[%s] %s",
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colors[check.WARN].Sprintf("%s", check.WARN),
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msg,
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)
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}
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func exitWithError(err error) {
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fmt.Fprintf(os.Stderr, "\n%v\n", err)
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os.Exit(1)
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}
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func continueWithError(err error, msg string) string {
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2017-07-13 00:24:09 +00:00
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if err != nil {
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2017-07-25 00:34:07 +00:00
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glog.V(1).Info(err)
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2017-07-13 00:24:09 +00:00
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}
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2017-07-25 00:34:07 +00:00
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if msg != "" {
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fmt.Fprintf(os.Stderr, "%s\n", msg)
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}
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return ""
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2017-07-13 00:24:09 +00:00
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}
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func cleanIDs(list string) []string {
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list = strings.Trim(list, ",")
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ids := strings.Split(list, ",")
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for _, id := range ids {
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id = strings.Trim(id, " ")
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}
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return ids
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}
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2017-08-15 15:44:40 +00:00
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// ps execs out to the ps command; it's separated into a function so we can write tests
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func ps(proc string) string {
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cmd := exec.Command("ps", "-C", proc, "-o", "cmd", "--no-headers")
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2017-07-13 00:24:09 +00:00
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out, err := cmd.Output()
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2017-07-25 00:34:07 +00:00
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if err != nil {
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continueWithError(fmt.Errorf("%s: %s", cmd.Args, err), "")
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}
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2017-07-13 00:24:09 +00:00
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2017-08-15 15:44:40 +00:00
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return string(out)
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}
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2017-07-13 00:24:09 +00:00
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2017-08-15 15:44:40 +00:00
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// verifyBin checks that the binary specified is running
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func verifyBin(bin string, psFunc func(string) string) bool {
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2017-07-13 00:24:09 +00:00
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2017-08-15 15:44:40 +00:00
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// Strip any quotes
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bin = strings.Trim(bin, "'\"")
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// bin could consist of more than one word
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// We'll search for running processes with the first word, and then check the whole
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// proc as supplied is included in the results
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proc := strings.Fields(bin)[0]
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out := psFunc(proc)
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return strings.Contains(out, bin)
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2017-07-13 00:24:09 +00:00
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}
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2017-08-11 16:59:57 +00:00
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func verifyKubeVersion(major string, minor string) {
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2017-07-13 00:24:09 +00:00
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// These executables might not be on the user's path.
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2017-08-11 16:59:57 +00:00
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_, err := exec.LookPath("kubectl")
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2017-07-25 00:34:07 +00:00
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if err != nil {
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2017-08-06 16:59:03 +00:00
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continueWithError(err, sprintlnWarn("Kubernetes version check skipped"))
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2017-07-25 00:34:07 +00:00
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return
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}
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2017-07-13 01:01:18 +00:00
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2017-08-11 16:59:57 +00:00
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cmd := exec.Command("kubectl", "version")
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2017-07-13 00:24:09 +00:00
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out, err := cmd.Output()
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2017-07-25 00:34:07 +00:00
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if err != nil {
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2017-08-11 16:59:57 +00:00
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s := fmt.Sprintf("Kubernetes version check skipped with error %v", err)
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continueWithError(err, sprintlnWarn(s))
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2017-08-15 15:44:40 +00:00
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if len(out) == 0 {
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return
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}
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2017-07-25 00:34:07 +00:00
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}
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2017-07-13 00:24:09 +00:00
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2017-08-11 16:59:57 +00:00
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msg := checkVersion("Client", string(out), major, minor)
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if msg != "" {
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continueWithError(fmt.Errorf(msg), msg)
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}
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msg = checkVersion("Server", string(out), major, minor)
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if msg != "" {
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continueWithError(fmt.Errorf(msg), msg)
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}
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}
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var regexVersionMajor = regexp.MustCompile("Major:\"([0-9]+)\"")
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var regexVersionMinor = regexp.MustCompile("Minor:\"([0-9]+)\"")
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func checkVersion(x string, s string, expMajor string, expMinor string) string {
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regexVersion, err := regexp.Compile(x + " Version: version.Info{(.*)}")
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if err != nil {
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return fmt.Sprintf("Error checking Kubernetes version: %v", err)
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}
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ss := regexVersion.FindString(s)
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major := versionMatch(regexVersionMajor, ss)
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minor := versionMatch(regexVersionMinor, ss)
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if major == "" || minor == "" {
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return fmt.Sprintf("Couldn't find %s version from kubectl output '%s'", x, s)
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}
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if major != expMajor || minor != expMinor {
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return fmt.Sprintf("Unexpected %s version %s.%s", x, major, minor)
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}
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return ""
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}
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func versionMatch(r *regexp.Regexp, s string) string {
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match := r.FindStringSubmatch(s)
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if len(match) < 2 {
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return ""
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2017-07-13 00:24:09 +00:00
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}
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2017-08-11 16:59:57 +00:00
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return match[1]
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2017-07-13 00:24:09 +00:00
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}
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2017-08-15 16:00:35 +00:00
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func multiWordReplace(s string, subname string, sub string) string {
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f := strings.Fields(sub)
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if len(f) > 1 {
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sub = "'" + sub + "'"
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}
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return strings.Replace(s, subname, sub, -1)
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}
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