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Merge pull request #37 from aquasecurity/multiple-words

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Support executables with multiple words (e.g. hyperkube apiserver)
This commit is contained in:
Liz Rice 2017-08-15 19:00:31 +01:00 committed by GitHub
commit a6a1ce945f
5 changed files with 159 additions and 80 deletions
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22
check/data
View File

@ -94,3 +94,25 @@ groups:
op: eq
value: "644"
set: true
- id: 9
text: "test permissions"
audit: "/bin/sh -c 'if test -e $config; then stat -c %a $config; fi'"
tests:
bin_op: or
test_items:
- flag: "644"
compare:
op: eq
value: "644"
set: true
- flag: "640"
compare:
op: eq
value: "640"
set: true
- flag: "600"
compare:
op: eq
value: "600"
set: true

8
check/test_test.go
View File

@ -86,6 +86,14 @@ func TestTestExecute(t *testing.T) {
controls.Groups[0].Checks[8],
"644",
},
{
controls.Groups[0].Checks[9],
"640",
},
{
controls.Groups[0].Checks[9],
"600",
},
}
for _, c := range cases {

66
cmd/common.go
View File

@ -17,7 +17,7 @@ package cmd
import (
"fmt"
"io/ioutil"
"strings"
"os"
"github.com/aquasecurity/kube-bench/check"
"github.com/spf13/viper"
@ -96,26 +96,26 @@ func runChecks(t check.NodeType) {
}
// Variable substitutions. Replace all occurrences of variables in controls files.
s := strings.Replace(string(in), "$apiserverbin", apiserverBin, -1)
s = strings.Replace(s, "$apiserverconf", apiserverConf, -1)
s = strings.Replace(s, "$schedulerbin", schedulerBin, -1)
s = strings.Replace(s, "$schedulerconf", schedulerConf, -1)
s = strings.Replace(s, "$controllermanagerbin", controllerManagerBin, -1)
s = strings.Replace(s, "$controllermanagerconf", controllerManagerConf, -1)
s = strings.Replace(s, "$config", config, -1)
s := multiWordReplace(string(in), "$apiserverbin", apiserverBin)
s = multiWordReplace(s, "$apiserverconf", apiserverConf)
s = multiWordReplace(s, "$schedulerbin", schedulerBin)
s = multiWordReplace(s, "$schedulerconf", schedulerConf)
s = multiWordReplace(s, "$controllermanagerbin", controllerManagerBin)
s = multiWordReplace(s, "$controllermanagerconf", controllerManagerConf)
s = multiWordReplace(s, "$config", config)
s = strings.Replace(s, "$etcdbin", etcdBin, -1)
s = strings.Replace(s, "$etcdconf", etcdConf, -1)
s = strings.Replace(s, "$flanneldbin", flanneldBin, -1)
s = strings.Replace(s, "$flanneldconf", flanneldConf, -1)
s = multiWordReplace(s, "$etcdbin", etcdBin)
s = multiWordReplace(s, "$etcdconf", etcdConf)
s = multiWordReplace(s, "$flanneldbin", flanneldBin)
s = multiWordReplace(s, "$flanneldconf", flanneldConf)
s = strings.Replace(s, "$kubeletbin", kubeletBin, -1)
s = strings.Replace(s, "$kubeletconf", kubeletConf, -1)
s = strings.Replace(s, "$proxybin", proxyBin, -1)
s = strings.Replace(s, "$proxyconf", proxyConf, -1)
s = multiWordReplace(s, "$kubeletbin", kubeletBin)
s = multiWordReplace(s, "$kubeletconf", kubeletConf)
s = multiWordReplace(s, "$proxybin", proxyBin)
s = multiWordReplace(s, "$proxyconf", proxyConf)
s = strings.Replace(s, "$fedapiserverbin", fedApiserverBin, -1)
s = strings.Replace(s, "$fedcontrollermanagerbin", fedControllerManagerBin, -1)
s = multiWordReplace(s, "$fedapiserverbin", fedApiserverBin)
s = multiWordReplace(s, "$fedcontrollermanagerbin", fedControllerManagerBin)
controls, err := check.NewControls(t, []byte(s))
if err != nil {
@ -150,15 +150,35 @@ func runChecks(t check.NodeType) {
// verifyNodeType checks the executables and config files are as expected
// for the specified tests (master, node or federated).
func verifyNodeType(t check.NodeType) {
var bins []string
var confs []string
switch t {
case check.MASTER:
verifyBin(apiserverBin, schedulerBin, controllerManagerBin)
verifyConf(apiserverConf, schedulerConf, controllerManagerConf)
bins = []string{apiserverBin, schedulerBin, controllerManagerBin}
confs = []string{apiserverConf, schedulerConf, controllerManagerConf}
case check.NODE:
verifyBin(kubeletBin, proxyBin)
verifyConf(kubeletConf, proxyConf)
bins = []string{kubeletBin, proxyBin}
confs = []string{kubeletConf, proxyConf}
case check.FEDERATED:
verifyBin(fedApiserverBin, fedControllerManagerBin)
bins = []string{fedApiserverBin, fedControllerManagerBin}
}
for _, bin := range bins {
if !verifyBin(bin, ps) {
printlnWarn(fmt.Sprintf("%s is not running", bin))
}
}
for _, conf := range confs {
_, err := os.Stat(conf)
if err != nil {
if os.IsNotExist(err) {
printlnWarn(fmt.Sprintf("Missing kubernetes config file: %s", conf))
} else {
exitWithError(fmt.Errorf("error looking for file %s: %v", conf, err))
}
}
}
}

79
cmd/util.go
View File

@ -64,66 +64,30 @@ func cleanIDs(list string) []string {
return ids
}
func verifyConf(confPath ...string) {
var missing string
for _, c := range confPath {
if _, err := os.Stat(c); err != nil && os.IsNotExist(err) {
e := fmt.Errorf("configuration file %s not found", c)
continueWithError(e, "")
missing += c + ", "
}
}
if len(missing) > 0 {
missing = strings.Trim(missing, ", ")
printlnWarn(fmt.Sprintf("Missing kubernetes config files: %s", missing))
}
}
func verifyBin(binPath ...string) {
var binSlice []string
var bin string
var missing string
var notRunning string
// Construct proc name for ps(1)
for _, b := range binPath {
_, err := exec.LookPath(b)
bin = bin + "," + b
binSlice = append(binSlice, b)
if err != nil {
e := fmt.Errorf("executable file %s not found", b)
continueWithError(e, "")
missing += b + ", "
}
}
bin = strings.Trim(bin, ",")
cmd := exec.Command("ps", "-C", bin, "-o", "cmd", "--no-headers")
// ps execs out to the ps command; it's separated into a function so we can write tests
func ps(proc string) string {
cmd := exec.Command("ps", "-C", proc, "-o", "cmd", "--no-headers")
out, err := cmd.Output()
if err != nil {
continueWithError(fmt.Errorf("%s: %s", cmd.Args, err), "")
}
for _, b := range binSlice {
matched := strings.Contains(string(out), b)
if !matched {
notRunning += b + ", "
}
return string(out)
}
if len(missing) > 0 {
missing = strings.Trim(missing, ", ")
printlnWarn(fmt.Sprintf("Missing kubernetes binaries: %s", missing))
}
// verifyBin checks that the binary specified is running
func verifyBin(bin string, psFunc func(string) string) bool {
if len(notRunning) > 0 {
notRunning = strings.Trim(notRunning, ", ")
printlnWarn(fmt.Sprintf("Kubernetes binaries not running: %s", notRunning))
}
// Strip any quotes
bin = strings.Trim(bin, "'\"")
// bin could consist of more than one word
// We'll search for running processes with the first word, and then check the whole
// proc as supplied is included in the results
proc := strings.Fields(bin)[0]
out := psFunc(proc)
return strings.Contains(out, bin)
}
func verifyKubeVersion(major string, minor string) {
@ -140,8 +104,10 @@ func verifyKubeVersion(major string, minor string) {
if err != nil {
s := fmt.Sprintf("Kubernetes version check skipped with error %v", err)
continueWithError(err, sprintlnWarn(s))
if len(out) == 0 {
return
}
}
msg := checkVersion("Client", string(out), major, minor)
if msg != "" {
@ -184,3 +150,12 @@ func versionMatch(r *regexp.Regexp, s string) string {
}
return match[1]
}
func multiWordReplace(s string, subname string, sub string) string {
f := strings.Fields(sub)
if len(f) > 1 {
sub = "'" + sub + "'"
}
return strings.Replace(s, subname, sub, -1)
}

62
cmd/util_test.go
View File

@ -16,6 +16,7 @@ package cmd
import (
"regexp"
"strconv"
"testing"
)
@ -36,8 +37,8 @@ func TestCheckVersion(t *testing.T) {
{t: "Server", s: "something unexpected", major: "2", minor: "0", exp: "Couldn't find Server version from kubectl output 'something unexpected'"},
}
for _, c := range cases {
t.Run("", func(t *testing.T) {
for id, c := range cases {
t.Run(strconv.Itoa(id), func(t *testing.T) {
m := checkVersion(c.t, c.s, c.major, c.minor)
if m != c.exp {
t.Fatalf("Got: %s, expected: %s", m, c.exp)
@ -66,8 +67,8 @@ func TestVersionMatch(t *testing.T) {
{r: minor}, // Checking that we don't fall over if the string is empty
}
for _, c := range cases {
t.Run("", func(t *testing.T) {
for id, c := range cases {
t.Run(strconv.Itoa(id), func(t *testing.T) {
m := versionMatch(c.r, c.s)
if m != c.exp {
t.Fatalf("Got %s expected %s", m, c.exp)
@ -75,3 +76,56 @@ func TestVersionMatch(t *testing.T) {
})
}
}
var g string
func fakeps(proc string) string {
return g
}
func TestVerifyBin(t *testing.T) {
cases := []struct {
proc string
psOut string
exp bool
}{
{proc: "single", psOut: "single", exp: true},
{proc: "single", psOut: "", exp: false},
{proc: "two words", psOut: "two words", exp: true},
{proc: "two words", psOut: "", exp: false},
{proc: "cmd", psOut: "cmd param1 param2", exp: true},
{proc: "cmd param", psOut: "cmd param1 param2", exp: true},
{proc: "cmd param", psOut: "cmd", exp: false},
}
for id, c := range cases {
t.Run(strconv.Itoa(id), func(t *testing.T) {
g = c.psOut
v := verifyBin(c.proc, fakeps)
if v != c.exp {
t.Fatalf("Expected %v got %v", c.exp, v)
}
})
}
}
func TestMultiWordReplace(t *testing.T) {
cases := []struct {
input string
sub string
subname string
output string
}{
{input: "Here's a file with no substitutions", sub: "blah", subname: "blah", output: "Here's a file with no substitutions"},
{input: "Here's a file with a substitution", sub: "blah", subname: "substitution", output: "Here's a file with a blah"},
{input: "Here's a file with multi-word substitutions", sub: "multi word", subname: "multi-word", output: "Here's a file with 'multi word' substitutions"},
{input: "Here's a file with several several substitutions several", sub: "blah", subname: "several", output: "Here's a file with blah blah substitutions blah"},
}
for id, c := range cases {
t.Run(strconv.Itoa(id), func(t *testing.T) {
s := multiWordReplace(c.input, c.subname, c.sub)
if s != c.output {
t.Fatalf("Expected %s got %s", c.output, s)
}
})
}
}