mirror of
https://github.com/edgelesssys/constellation.git
synced 2024-09-20 00:06:21 +00:00
317 lines
8.8 KiB
Go
317 lines
8.8 KiB
Go
package main
|
|
|
|
import (
|
|
"context"
|
|
"os"
|
|
"path"
|
|
"path/filepath"
|
|
"strconv"
|
|
"strings"
|
|
"testing"
|
|
|
|
"github.com/edgelesssys/constellation/internal/deploy/ssh"
|
|
"github.com/edgelesssys/constellation/internal/deploy/user"
|
|
"github.com/spf13/afero"
|
|
"github.com/stretchr/testify/assert"
|
|
"github.com/stretchr/testify/require"
|
|
v1 "k8s.io/api/core/v1"
|
|
)
|
|
|
|
func TestEvictUser(t *testing.T) {
|
|
require := require.New(t)
|
|
assert := assert.New(t)
|
|
|
|
fs := afero.NewMemMapFs()
|
|
linuxUserManager := user.NewLinuxUserManagerFake(fs)
|
|
|
|
// Create fake user directory
|
|
homePath := path.Join(normalHomePath, "myuser")
|
|
err := fs.MkdirAll(homePath, 0o700)
|
|
require.NoError(err)
|
|
|
|
// Try to evict the user
|
|
assert.NoError(evictUser("myuser", fs, linuxUserManager))
|
|
|
|
// Check if user has been evicted
|
|
homeEntries, err := afero.ReadDir(fs, normalHomePath)
|
|
require.NoError(err)
|
|
evictedEntries, err := afero.ReadDir(fs, evictedHomePath)
|
|
require.NoError(err)
|
|
assert.Len(homeEntries, 0)
|
|
assert.Len(evictedEntries, 1)
|
|
for _, singleEntry := range evictedEntries {
|
|
assert.Contains(singleEntry.Name(), "myuser")
|
|
}
|
|
|
|
/*
|
|
Note: Unfourtunaly, due to a bug in afero, we cannot test that the files inside the directory have actually been moved.
|
|
This works on the real filesystem, but not on the memory filesystem.
|
|
See: https://github.com/spf13/afero/issues/141 (known since 2017, guess it will never get fixed ¯\_(ツ)_/¯)
|
|
This limits the scope of this test, obviously... But I think as long as we can move the directory,
|
|
the functionality on the real filesystem should be there (unless it throws an error).
|
|
*/
|
|
}
|
|
|
|
func TestDeployKeys(t *testing.T) {
|
|
require := require.New(t)
|
|
assert := assert.New(t)
|
|
|
|
testCases := map[string]struct {
|
|
configMap *v1.ConfigMap
|
|
existingUsers map[string]uidGIDPair
|
|
}{
|
|
"undefined": {},
|
|
"undefined map, empty users": {existingUsers: map[string]uidGIDPair{}},
|
|
"empty map, undefined users": {configMap: &v1.ConfigMap{}},
|
|
"both empty": {
|
|
configMap: &v1.ConfigMap{
|
|
Data: map[string]string{},
|
|
},
|
|
existingUsers: map[string]uidGIDPair{},
|
|
},
|
|
"create two users, no existing users": {
|
|
configMap: &v1.ConfigMap{
|
|
Data: map[string]string{
|
|
"user1": "ssh-rsa abcdefgh",
|
|
"user2": "ssh-ed25519 defghijklm",
|
|
},
|
|
},
|
|
existingUsers: map[string]uidGIDPair{},
|
|
},
|
|
"empty configMap, user1 and user2 should be evicted": {
|
|
configMap: &v1.ConfigMap{
|
|
Data: map[string]string{},
|
|
},
|
|
existingUsers: map[string]uidGIDPair{
|
|
"user1": {
|
|
UID: 1000,
|
|
GID: 1000,
|
|
},
|
|
"user2": {
|
|
UID: 1001,
|
|
GID: 1001,
|
|
},
|
|
},
|
|
},
|
|
"configMap contains user2, user1 should be evicted, user2 recreated": {
|
|
configMap: &v1.ConfigMap{
|
|
Data: map[string]string{
|
|
"user2": "ssh-rsa abcdefg",
|
|
},
|
|
},
|
|
existingUsers: map[string]uidGIDPair{
|
|
"user1": {
|
|
UID: 1000,
|
|
GID: 1000,
|
|
},
|
|
"user2": {
|
|
UID: 1001,
|
|
GID: 1001,
|
|
},
|
|
},
|
|
},
|
|
"configMap contains user1 and user3, user1 should be recreated, user2 evicted, user3 created": {
|
|
configMap: &v1.ConfigMap{
|
|
Data: map[string]string{
|
|
"user1": "ssh-rsa abcdefg",
|
|
"user3": "ssh-ed25519 defghijklm",
|
|
},
|
|
},
|
|
existingUsers: map[string]uidGIDPair{
|
|
"user1": {
|
|
UID: 1000,
|
|
GID: 1000,
|
|
},
|
|
"user2": {
|
|
UID: 1001,
|
|
GID: 1001,
|
|
},
|
|
},
|
|
},
|
|
"configMap contains user1 and user3, both should be recreated": {
|
|
configMap: &v1.ConfigMap{
|
|
Data: map[string]string{
|
|
"user1": "ssh-rsa abcdefg",
|
|
"user3": "ssh-ed25519 defghijklm",
|
|
},
|
|
},
|
|
existingUsers: map[string]uidGIDPair{
|
|
"user1": {
|
|
UID: 1000,
|
|
GID: 1000,
|
|
},
|
|
"user3": {
|
|
UID: 1002,
|
|
GID: 1002,
|
|
},
|
|
},
|
|
},
|
|
"configMap contains user2, user1 and user3 should be evicted, user2 should be created": {
|
|
configMap: &v1.ConfigMap{
|
|
Data: map[string]string{
|
|
"user2": "ssh-ed25519 defghijklm",
|
|
},
|
|
},
|
|
existingUsers: map[string]uidGIDPair{
|
|
"user1": {
|
|
UID: 1000,
|
|
GID: 1000,
|
|
},
|
|
"user3": {
|
|
UID: 1002,
|
|
GID: 1002,
|
|
},
|
|
},
|
|
},
|
|
}
|
|
for _, tc := range testCases {
|
|
fs := afero.NewMemMapFs()
|
|
require.NoError(fs.MkdirAll(normalHomePath, 0o700))
|
|
require.NoError(fs.Mkdir("/etc", 0o644))
|
|
_, err := fs.Create("/etc/passwd")
|
|
require.NoError(err)
|
|
|
|
// Create fake user directories
|
|
for user := range tc.existingUsers {
|
|
userHomePath := path.Join(normalHomePath, user)
|
|
err := fs.MkdirAll(userHomePath, 0o700)
|
|
require.NoError(err)
|
|
require.NoError(fs.Chown(userHomePath, int(tc.existingUsers[user].UID), int(tc.existingUsers[user].GID)))
|
|
}
|
|
|
|
linuxUserManager := user.NewLinuxUserManagerFake(fs)
|
|
sshAccess := ssh.NewAccess(linuxUserManager)
|
|
deployKeys(context.Background(), tc.configMap, fs, linuxUserManager, tc.existingUsers, sshAccess)
|
|
|
|
// Unfourtunaly, we cannot retrieve the UID/GID from afero's MemMapFs without weird hacks,
|
|
// as it does not have getters and it is not exported.
|
|
if tc.configMap != nil && tc.existingUsers != nil {
|
|
// Parse /etc/passwd and check for users
|
|
passwdEntries, err := linuxUserManager.Passwd.Parse(fs)
|
|
require.NoError(err)
|
|
|
|
// Check recreation or deletion
|
|
for user := range tc.existingUsers {
|
|
if _, ok := tc.configMap.Data[user]; ok {
|
|
checkHomeDirectory(user, fs, assert, true)
|
|
|
|
// Check if user exists in /etc/passwd
|
|
userEntry, ok := passwdEntries[user]
|
|
assert.True(ok)
|
|
|
|
// Check if user has been recreated with correct UID/GID
|
|
actualUID, err := strconv.Atoi(userEntry.Uid)
|
|
assert.NoError(err)
|
|
assert.EqualValues(tc.existingUsers[user].UID, actualUID)
|
|
actualGID, err := strconv.Atoi(userEntry.Gid)
|
|
assert.NoError(err)
|
|
assert.EqualValues(tc.existingUsers[user].GID, actualGID)
|
|
|
|
// Check if the user has the right keys
|
|
checkSSHKeys(user, fs, assert, tc.configMap.Data[user]+"\n")
|
|
|
|
} else {
|
|
// Check if home directory is not available anymore under the regular path
|
|
checkHomeDirectory(user, fs, assert, false)
|
|
|
|
// Check if home directory has been evicted
|
|
homeDirs, err := afero.ReadDir(fs, evictedHomePath)
|
|
require.NoError(err)
|
|
|
|
var userDirectoryName string
|
|
for _, singleDir := range homeDirs {
|
|
if strings.Contains(singleDir.Name(), user+"_") {
|
|
userDirectoryName = singleDir.Name()
|
|
break
|
|
}
|
|
}
|
|
assert.NotEmpty(userDirectoryName)
|
|
|
|
// Check if user does not exist in /etc/passwd
|
|
_, ok := passwdEntries[user]
|
|
assert.False(ok)
|
|
}
|
|
}
|
|
|
|
// Check creation of new users
|
|
for user := range tc.configMap.Data {
|
|
// We already checked recreated or evicted users, so skip them.
|
|
if _, ok := tc.existingUsers[user]; ok {
|
|
continue
|
|
}
|
|
|
|
checkHomeDirectory(user, fs, assert, true)
|
|
checkSSHKeys(user, fs, assert, tc.configMap.Data[user]+"\n")
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestEvictRootKey(t *testing.T) {
|
|
assert := assert.New(t)
|
|
require := require.New(t)
|
|
fs := afero.NewMemMapFs()
|
|
|
|
// Create /etc/passwd with root entry
|
|
require.NoError(fs.Mkdir("/etc", 0o644))
|
|
file, err := fs.Create("/etc/passwd")
|
|
require.NoError(err)
|
|
passwdRootEntry := "root:x:0:0:root:/root:/bin/bash\n"
|
|
n, err := file.WriteString(passwdRootEntry)
|
|
require.NoError(err)
|
|
require.Equal(len(passwdRootEntry), n)
|
|
|
|
// Deploy a fake key for root
|
|
require.NoError(fs.MkdirAll("/root/.ssh/authorized_keys.d", 0o700))
|
|
file, err = fs.Create(filepath.Join("/root", relativePathToSSHKeys))
|
|
require.NoError(err)
|
|
_, err = file.WriteString("ssh-ed25519 abcdefghijklm\n")
|
|
require.NoError(err)
|
|
|
|
linuxUserManager := user.NewLinuxUserManagerFake(fs)
|
|
|
|
// Parse /etc/passwd and check for users
|
|
passwdEntries, err := linuxUserManager.Passwd.Parse(fs)
|
|
require.NoError(err)
|
|
|
|
// Check if user exists in /etc/passwd
|
|
userEntry, ok := passwdEntries["root"]
|
|
assert.True(ok)
|
|
|
|
// Check if user has been recreated with correct UID/GID
|
|
actualUID, err := strconv.Atoi(userEntry.Uid)
|
|
assert.NoError(err)
|
|
assert.EqualValues(0, actualUID)
|
|
actualGID, err := strconv.Atoi(userEntry.Gid)
|
|
assert.NoError(err)
|
|
assert.EqualValues(0, actualGID)
|
|
|
|
// Delete the key
|
|
assert.NoError(evictRootKey(fs, linuxUserManager))
|
|
|
|
// Check if the key has been deleted
|
|
_, err = fs.Stat(filepath.Join("/root", relativePathToSSHKeys))
|
|
assert.True(os.IsNotExist(err))
|
|
}
|
|
|
|
func checkSSHKeys(user string, fs afero.Fs, assert *assert.Assertions, expectedValue string) {
|
|
// Do the same check as above
|
|
_, err := fs.Stat(path.Join(normalHomePath, user))
|
|
assert.NoError(err)
|
|
|
|
// Check if the user has the right keys
|
|
authorizedKeys, err := afero.ReadFile(fs, filepath.Join(normalHomePath, user, relativePathToSSHKeys))
|
|
assert.NoError(err)
|
|
assert.EqualValues(expectedValue, string(authorizedKeys))
|
|
}
|
|
|
|
func checkHomeDirectory(user string, fs afero.Fs, assert *assert.Assertions, shouldExist bool) {
|
|
_, err := fs.Stat(path.Join(normalHomePath, user))
|
|
if shouldExist {
|
|
assert.NoError(err)
|
|
} else {
|
|
assert.Error(err)
|
|
assert.True(os.IsNotExist(err))
|
|
}
|
|
}
|