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cloud-init.go
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cloud-init.go
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/*
* This file is part of the kubevirt project
*
* 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.
*
* Copyright 2017 Red Hat, Inc.
*
*/
package cloudinit
import (
"encoding/base64"
"encoding/json"
"fmt"
"os"
"os/exec"
"path"
"path/filepath"
"strconv"
"strings"
"time"
"github.com/google/uuid"
v1 "kubevirt.io/api/core/v1"
"kubevirt.io/client-go/log"
"kubevirt.io/client-go/precond"
diskutils "kubevirt.io/kubevirt/pkg/ephemeral-disk-utils"
"kubevirt.io/kubevirt/pkg/util"
"kubevirt.io/kubevirt/pkg/util/net/dns"
)
const isoStagingFmt = "%s.staging"
type IsoCreationFunc func(isoOutFile, volumeID string, inDir string) error
var cloudInitLocalDir = "/var/run/libvirt/cloud-init-dir"
var cloudInitIsoFunc = defaultIsoFunc
// Locations of data source disk files
const (
noCloudFile = "noCloud.iso"
configDriveFile = "configdrive.iso"
)
type DataSourceType string
type DeviceMetadataType string
const (
DataSourceNoCloud DataSourceType = "noCloud"
DataSourceConfigDrive DataSourceType = "configDrive"
NICMetadataType DeviceMetadataType = "nic"
HostDevMetadataType DeviceMetadataType = "hostdev"
)
// CloudInitData is a data source independent struct that
// holds cloud-init user and network data
type CloudInitData struct {
DataSource DataSourceType
NoCloudMetaData *NoCloudMetadata
ConfigDriveMetaData *ConfigDriveMetadata
UserData string
NetworkData string
DevicesData *[]DeviceData
VolumeName string
}
type PublicSSHKey struct {
string
}
type NoCloudMetadata struct {
InstanceType string `json:"instance-type,omitempty"`
InstanceID string `json:"instance-id"`
LocalHostname string `json:"local-hostname,omitempty"`
PublicSSHKeys map[string]string `json:"public-keys,omitempty"`
}
type ConfigDriveMetadata struct {
InstanceType string `json:"instance_type,omitempty"`
InstanceID string `json:"instance_id"`
LocalHostname string `json:"local_hostname,omitempty"`
Hostname string `json:"hostname,omitempty"`
UUID string `json:"uuid,omitempty"`
Devices *[]DeviceData `json:"devices,omitempty"`
PublicSSHKeys map[string]string `json:"public_keys,omitempty"`
}
type DeviceData struct {
Type DeviceMetadataType `json:"type"`
Bus string `json:"bus"`
Address string `json:"address"`
MAC string `json:"mac,omitempty"`
Serial string `json:"serial,omitempty"`
NumaNode uint32 `json:"numaNode,omitempty"`
AlignedCPUs []uint32 `json:"alignedCPUs,omitempty"`
Tags []string `json:"tags"`
}
// IsValidCloudInitData checks if the given CloudInitData object is valid in the sense that GenerateLocalData can be called with it.
func IsValidCloudInitData(cloudInitData *CloudInitData) bool {
return cloudInitData != nil && cloudInitData.UserData != "" && (cloudInitData.NoCloudMetaData != nil || cloudInitData.ConfigDriveMetaData != nil)
}
func cloudInitUUIDFromVMI(vmi *v1.VirtualMachineInstance) string {
if vmi.Spec.Domain.Firmware == nil {
return uuid.NewString()
}
return string(vmi.Spec.Domain.Firmware.UUID)
}
// ReadCloudInitVolumeDataSource scans the given VMI for CloudInit volumes and
// reads their content into a CloudInitData struct. Does not resolve secret refs.
func ReadCloudInitVolumeDataSource(vmi *v1.VirtualMachineInstance, secretSourceDir string) (cloudInitData *CloudInitData, err error) {
precond.MustNotBeNil(vmi)
// ClusterInstancetypeAnnotation will take precedence over a namespaced Instancetype
// for setting instance_type in the metadata
instancetype := vmi.Annotations[v1.ClusterInstancetypeAnnotation]
if instancetype == "" {
instancetype = vmi.Annotations[v1.InstancetypeAnnotation]
}
hostname := dns.SanitizeHostname(vmi)
for _, volume := range vmi.Spec.Volumes {
if volume.CloudInitNoCloud != nil {
keys, err := resolveNoCloudSecrets(vmi, secretSourceDir)
if err != nil {
return nil, err
}
cloudInitData, err = readCloudInitNoCloudSource(volume.CloudInitNoCloud)
cloudInitData.NoCloudMetaData = readCloudInitNoCloudMetaData(hostname, cloudInitUUIDFromVMI(vmi), instancetype, keys)
cloudInitData.VolumeName = volume.Name
return cloudInitData, err
}
if volume.CloudInitConfigDrive != nil {
keys, err := resolveConfigDriveSecrets(vmi, secretSourceDir)
if err != nil {
return nil, err
}
uuid := cloudInitUUIDFromVMI(vmi)
cloudInitData, err = readCloudInitConfigDriveSource(volume.CloudInitConfigDrive)
cloudInitData.ConfigDriveMetaData = readCloudInitConfigDriveMetaData(vmi.Name, uuid, hostname, vmi.Namespace, keys, instancetype)
cloudInitData.VolumeName = volume.Name
return cloudInitData, err
}
}
return nil, nil
}
func isNoCloudAccessCredential(accessCred v1.AccessCredential) bool {
return accessCred.SSHPublicKey != nil && accessCred.SSHPublicKey.PropagationMethod.NoCloud != nil
}
func isConfigDriveAccessCredential(accessCred v1.AccessCredential) bool {
return accessCred.SSHPublicKey != nil && accessCred.SSHPublicKey.PropagationMethod.ConfigDrive != nil
}
func resolveSSHPublicKeys(accessCredentials []v1.AccessCredential, secretSourceDir string, isAccessCredentialValidFunc func(v1.AccessCredential) bool) (map[string]string, error) {
keys := make(map[string]string)
count := 0
for _, accessCred := range accessCredentials {
if !isAccessCredentialValidFunc(accessCred) {
continue
}
secretName := ""
if accessCred.SSHPublicKey.Source.Secret != nil {
secretName = accessCred.SSHPublicKey.Source.Secret.SecretName
}
if secretName == "" {
continue
}
baseDir := filepath.Join(secretSourceDir, secretName+"-access-cred")
files, err := os.ReadDir(baseDir)
if err != nil {
return keys, err
}
for _, file := range files {
if file.IsDir() || strings.HasPrefix(file.Name(), "..") {
continue
}
keyData, err := readFileFromDir(baseDir, file.Name())
if err != nil {
return keys, fmt.Errorf("Unable to read public keys found at volume: %s/%s error: %v", baseDir, file.Name(), err)
}
if keyData == "" {
continue
}
keys[strconv.Itoa(count)] = keyData
count++
}
}
return keys, nil
}
// resolveNoCloudSecrets is looking for CloudInitNoCloud volumes with UserDataSecretRef
// requests. It reads the `userdata` secret the corresponds to the given CloudInitNoCloud
// volume and sets the UserData field on that volume.
//
// Note: when using this function, make sure that your code can access the secret volumes.
func resolveNoCloudSecrets(vmi *v1.VirtualMachineInstance, secretSourceDir string) (map[string]string, error) {
keys, err := resolveSSHPublicKeys(vmi.Spec.AccessCredentials, secretSourceDir, isNoCloudAccessCredential)
if err != nil {
return keys, err
}
volume := findCloudInitNoCloudSecretVolume(vmi.Spec.Volumes)
if volume == nil {
return keys, nil
}
baseDir := filepath.Join(secretSourceDir, volume.Name)
var userDataError, networkDataError error
var userData, networkData string
if volume.CloudInitNoCloud.UserDataSecretRef != nil {
userData, userDataError = readFirstFoundFileFromDir(baseDir, []string{"userdata", "userData"})
}
if volume.CloudInitNoCloud.NetworkDataSecretRef != nil {
networkData, networkDataError = readFirstFoundFileFromDir(baseDir, []string{"networkdata", "networkData"})
}
if userDataError != nil && networkDataError != nil {
return keys, fmt.Errorf("no cloud-init data-source found at volume: %s", volume.Name)
}
if userData != "" {
volume.CloudInitNoCloud.UserData = userData
}
if networkData != "" {
volume.CloudInitNoCloud.NetworkData = networkData
}
return keys, nil
}
// resolveConfigDriveSecrets is looking for CloudInitConfigDriveSource volume source with
// UserDataSecretRef and NetworkDataSecretRef and resolves the secret from the corresponding
// VolumeMount.
//
// Note: when using this function, make sure that your code can access the secret volumes.
func resolveConfigDriveSecrets(vmi *v1.VirtualMachineInstance, secretSourceDir string) (map[string]string, error) {
keys, err := resolveSSHPublicKeys(vmi.Spec.AccessCredentials, secretSourceDir, isConfigDriveAccessCredential)
if err != nil {
return keys, err
}
if err != nil {
return keys, err
}
volume := findCloudInitConfigDriveSecretVolume(vmi.Spec.Volumes)
if volume == nil {
return keys, nil
}
baseDir := filepath.Join(secretSourceDir, volume.Name)
var userDataError, networkDataError error
var userData, networkData string
if volume.CloudInitConfigDrive.UserDataSecretRef != nil {
userData, userDataError = readFirstFoundFileFromDir(baseDir, []string{"userdata", "userData"})
}
if volume.CloudInitConfigDrive.NetworkDataSecretRef != nil {
networkData, networkDataError = readFirstFoundFileFromDir(baseDir, []string{"networkdata", "networkData"})
}
if userDataError != nil && networkDataError != nil {
return keys, fmt.Errorf("no cloud-init data-source found at volume: %s", volume.Name)
}
if userData != "" {
volume.CloudInitConfigDrive.UserData = userData
}
if networkData != "" {
volume.CloudInitConfigDrive.NetworkData = networkData
}
return keys, nil
}
// findCloudInitConfigDriveSecretVolume loops over a given list of volumes and return a pointer
// to the first volume with a CloudInitConfigDrive source and UserDataSecretRef field set.
func findCloudInitConfigDriveSecretVolume(volumes []v1.Volume) *v1.Volume {
for _, volume := range volumes {
if volume.CloudInitConfigDrive == nil {
continue
}
if volume.CloudInitConfigDrive.UserDataSecretRef != nil ||
volume.CloudInitConfigDrive.NetworkDataSecretRef != nil {
return &volume
}
}
return nil
}
func readFirstFoundFileFromDir(basedir string, files []string) (string, error) {
var err error
var data string
for _, file := range files {
data, err = readFileFromDir(basedir, file)
if err == nil {
break
}
}
return data, err
}
func readFileFromDir(basedir, file string) (string, error) {
filePath := filepath.Join(basedir, file)
// #nosec No risk for path injection: basedir & secretFile are static strings
data, err := os.ReadFile(filePath)
if err != nil {
log.Log.Reason(err).Errorf("could not read data from source: %s", filePath)
return "", err
}
return string(data), nil
}
// findCloudInitNoCloudSecretVolume loops over a given list of volumes and return a pointer
// to the first CloudInitNoCloud volume with a UserDataSecretRef field set.
func findCloudInitNoCloudSecretVolume(volumes []v1.Volume) *v1.Volume {
for _, volume := range volumes {
if volume.CloudInitNoCloud == nil {
continue
}
if volume.CloudInitNoCloud.UserDataSecretRef != nil ||
volume.CloudInitNoCloud.NetworkDataSecretRef != nil {
return &volume
}
}
return nil
}
func readRawOrBase64Data(rawData, base64Data string) (string, error) {
if rawData != "" {
return rawData, nil
} else if base64Data != "" {
bytes, err := base64.StdEncoding.DecodeString(base64Data)
return string(bytes), err
}
return "", nil
}
// readCloudInitData reads user and network data raw or in base64 encoding,
// regardless from which data source they are coming from
func readCloudInitData(userData, userDataBase64, networkData, networkDataBase64 string) (string, string, error) {
readUserData, err := readRawOrBase64Data(userData, userDataBase64)
if err != nil {
return "", "", err
}
readNetworkData, err := readRawOrBase64Data(networkData, networkDataBase64)
if err != nil {
return "", "", err
}
if readUserData == "" && readNetworkData == "" {
return "", "", fmt.Errorf("userDataBase64, userData, networkDataBase64 or networkData is required for a cloud-init data source")
}
return readUserData, readNetworkData, nil
}
func readCloudInitNoCloudSource(source *v1.CloudInitNoCloudSource) (*CloudInitData, error) {
userData, networkData, err := readCloudInitData(source.UserData,
source.UserDataBase64, source.NetworkData, source.NetworkDataBase64)
if err != nil {
return &CloudInitData{}, err
}
return &CloudInitData{
DataSource: DataSourceNoCloud,
UserData: userData,
NetworkData: networkData,
}, nil
}
func readCloudInitConfigDriveSource(source *v1.CloudInitConfigDriveSource) (*CloudInitData, error) {
userData, networkData, err := readCloudInitData(source.UserData,
source.UserDataBase64, source.NetworkData, source.NetworkDataBase64)
if err != nil {
return &CloudInitData{}, err
}
return &CloudInitData{
DataSource: DataSourceConfigDrive,
UserData: userData,
NetworkData: networkData,
}, nil
}
func readCloudInitNoCloudMetaData(hostname, instanceId string, instanceType string, keys map[string]string) *NoCloudMetadata {
return &NoCloudMetadata{
InstanceType: instanceType,
InstanceID: instanceId,
LocalHostname: hostname,
PublicSSHKeys: keys,
}
}
func readCloudInitConfigDriveMetaData(name, uuid, hostname, namespace string, keys map[string]string, instanceType string) *ConfigDriveMetadata {
return &ConfigDriveMetadata{
InstanceType: instanceType,
UUID: uuid,
InstanceID: fmt.Sprintf("%s.%s", name, namespace),
Hostname: hostname,
PublicSSHKeys: keys,
}
}
func defaultIsoFunc(isoOutFile, volumeID string, inDir string) error {
var args []string
args = append(args, "-output")
args = append(args, isoOutFile)
args = append(args, "-volid")
args = append(args, volumeID)
args = append(args, "-joliet")
args = append(args, "-rock")
args = append(args, "-partition_cyl_align")
args = append(args, "on")
args = append(args, inDir)
isoBinary := "xorrisofs"
// #nosec No risk for attacket injection. Parameters are predefined strings
cmd := exec.Command(isoBinary, args...)
err := cmd.Start()
if err != nil {
log.Log.Reason(err).Errorf("%s cmd failed to start while generating iso file %s", isoBinary, isoOutFile)
return err
}
done := make(chan error)
go func() { done <- cmd.Wait() }()
timeout := time.After(10 * time.Second)
for {
select {
case <-timeout:
log.Log.Errorf("Timed out generating cloud-init iso at path %s", isoOutFile)
cmd.Process.Kill()
case err := <-done:
if err != nil {
log.Log.Reason(err).Errorf("%s returned non-zero exit code while generating iso file %s with args '%s'", isoBinary, isoOutFile, strings.Join(cmd.Args, " "))
return err
}
return nil
}
}
}
// The unit test suite uses this function
func SetIsoCreationFunction(isoFunc IsoCreationFunc) {
cloudInitIsoFunc = isoFunc
}
func SetLocalDirectory(dir string) error {
err := util.MkdirAllWithNosec(dir)
if err != nil {
return fmt.Errorf("unable to initialize cloudInit local cache directory (%s). %v", dir, err)
}
exists, err := diskutils.FileExists(dir)
if err != nil {
return fmt.Errorf("CloudInit local cache directory (%s) does not exist or is inaccessible. %v", dir, err)
} else if exists == false {
return fmt.Errorf("CloudInit local cache directory (%s) does not exist or is inaccessible", dir)
}
SetLocalDirectoryOnly(dir)
return nil
}
// XXX refactor this whole package
// This is just a cheap workaround to make e2e tests pass
func SetLocalDirectoryOnly(dir string) {
cloudInitLocalDir = dir
}
func getDomainBasePath(domain string, namespace string) string {
return fmt.Sprintf("%s/%s/%s", cloudInitLocalDir, namespace, domain)
}
func GetIsoFilePath(source DataSourceType, domain, namespace string) string {
switch source {
case DataSourceNoCloud:
return fmt.Sprintf("%s/%s", getDomainBasePath(domain, namespace), noCloudFile)
case DataSourceConfigDrive:
return fmt.Sprintf("%s/%s", getDomainBasePath(domain, namespace), configDriveFile)
}
return fmt.Sprintf("%s/%s", getDomainBasePath(domain, namespace), noCloudFile)
}
func PrepareLocalPath(vmiName string, namespace string) error {
return util.MkdirAllWithNosec(getDomainBasePath(vmiName, namespace))
}
func GenerateEmptyIso(vmiName string, namespace string, data *CloudInitData, size int64) error {
precond.MustNotBeEmpty(vmiName)
precond.MustNotBeNil(data)
var err error
var isoStaging, iso string
switch data.DataSource {
case DataSourceNoCloud, DataSourceConfigDrive:
iso = GetIsoFilePath(data.DataSource, vmiName, namespace)
default:
return fmt.Errorf("invalid cloud-init data source: '%v'", data.DataSource)
}
isoStaging = fmt.Sprintf(isoStagingFmt, iso)
err = diskutils.RemoveFilesIfExist(isoStaging)
if err != nil {
return err
}
err = util.MkdirAllWithNosec(path.Dir(isoStaging))
if err != nil {
log.Log.Reason(err).Errorf("unable to create cloud-init base path %s", path.Dir(isoStaging))
return err
}
f, err := os.Create(isoStaging)
if err != nil {
return fmt.Errorf("failed to create empty iso: '%s'", isoStaging)
}
err = util.WriteBytes(f, 0, size)
if err != nil {
return err
}
util.CloseIOAndCheckErr(f, &err)
if err != nil {
return err
}
if err := diskutils.DefaultOwnershipManager.UnsafeSetFileOwnership(isoStaging); err != nil {
return err
}
err = os.Rename(isoStaging, iso)
if err != nil {
log.Log.Reason(err).Errorf("Cloud-init failed to rename file %s to %s", isoStaging, iso)
return err
}
log.Log.V(2).Infof("generated empty iso file %s", iso)
return nil
}
func GenerateLocalData(vmi *v1.VirtualMachineInstance, instanceType string, data *CloudInitData) error {
precond.MustNotBeEmpty(vmi.Name)
precond.MustNotBeNil(data)
var metaData []byte
var err error
domainBasePath := getDomainBasePath(vmi.Name, vmi.Namespace)
dataBasePath := fmt.Sprintf("%s/data", domainBasePath)
var dataPath, metaFile, userFile, networkFile, iso, isoStaging string
switch data.DataSource {
case DataSourceNoCloud:
dataPath = dataBasePath
metaFile = fmt.Sprintf("%s/%s", dataPath, "meta-data")
userFile = fmt.Sprintf("%s/%s", dataPath, "user-data")
networkFile = fmt.Sprintf("%s/%s", dataPath, "network-config")
iso = GetIsoFilePath(DataSourceNoCloud, vmi.Name, vmi.Namespace)
isoStaging = fmt.Sprintf(isoStagingFmt, iso)
if data.NoCloudMetaData == nil {
log.Log.V(2).Infof("No metadata found in cloud-init data. Create minimal metadata with instance-id.")
data.NoCloudMetaData = &NoCloudMetadata{
InstanceID: cloudInitUUIDFromVMI(vmi),
}
data.NoCloudMetaData.InstanceType = instanceType
}
metaData, err = json.Marshal(data.NoCloudMetaData)
if err != nil {
return err
}
case DataSourceConfigDrive:
dataPath = fmt.Sprintf("%s/openstack/latest", dataBasePath)
metaFile = fmt.Sprintf("%s/%s", dataPath, "meta_data.json")
userFile = fmt.Sprintf("%s/%s", dataPath, "user_data")
networkFile = fmt.Sprintf("%s/%s", dataPath, "network_data.json")
iso = GetIsoFilePath(DataSourceConfigDrive, vmi.Name, vmi.Namespace)
isoStaging = fmt.Sprintf(isoStagingFmt, iso)
if data.ConfigDriveMetaData == nil {
log.Log.V(2).Infof("No metadata found in cloud-init data. Create minimal metadata with instance-id.")
instanceId := fmt.Sprintf("%s.%s", vmi.Name, vmi.Namespace)
data.ConfigDriveMetaData = &ConfigDriveMetadata{
InstanceID: instanceId,
UUID: cloudInitUUIDFromVMI(vmi),
}
data.ConfigDriveMetaData.InstanceType = instanceType
}
data.ConfigDriveMetaData.Devices = data.DevicesData
metaData, err = json.Marshal(data.ConfigDriveMetaData)
if err != nil {
return err
}
default:
return fmt.Errorf("Invalid cloud-init data source: '%v'", data.DataSource)
}
err = util.MkdirAllWithNosec(dataPath)
if err != nil {
log.Log.Reason(err).Errorf("unable to create cloud-init base path %s", domainBasePath)
return err
}
if data.UserData == "" && data.NetworkData == "" {
return fmt.Errorf("UserData or NetworkData is required for cloud-init data source")
}
userData := []byte(data.UserData)
var networkData []byte
if data.NetworkData != "" {
networkData = []byte(data.NetworkData)
}
err = diskutils.RemoveFilesIfExist(userFile, metaFile, networkFile, isoStaging)
if err != nil {
return err
}
err = os.WriteFile(userFile, userData, 0600)
if err != nil {
return err
}
defer os.Remove(userFile)
err = os.WriteFile(metaFile, metaData, 0600)
if err != nil {
return err
}
defer os.Remove(metaFile)
if len(networkData) > 0 {
err = os.WriteFile(networkFile, networkData, 0600)
if err != nil {
return err
}
defer os.Remove(networkFile)
}
switch data.DataSource {
case DataSourceNoCloud:
err = cloudInitIsoFunc(isoStaging, "cidata", dataBasePath)
case DataSourceConfigDrive:
err = cloudInitIsoFunc(isoStaging, "config-2", dataBasePath)
}
if err != nil {
return err
}
if err := diskutils.DefaultOwnershipManager.UnsafeSetFileOwnership(isoStaging); err != nil {
return err
}
err = os.Rename(isoStaging, iso)
if err != nil {
log.Log.Reason(err).Errorf("Cloud-init failed to rename file %s to %s", isoStaging, iso)
return err
}
log.Log.V(2).Infof("generated nocloud iso file %s", iso)
return nil
}