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hostosconfig.go
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hostosconfig.go
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package v1alpha1
import (
"crypto/x509"
"encoding/pem"
"fmt"
"net"
"net/url"
"strings"
"github.com/pkg/errors"
"sigs.k8s.io/cluster-api/bootstrap/kubeadm/api/v1beta1"
)
func validateHostOSConfig(config *HostOSConfiguration, osFamily OSFamily) error {
if config == nil {
return nil
}
if err := validateNTPServers(config.NTPConfiguration); err != nil {
return err
}
for _, certBundle := range config.CertBundles {
if err := validateCertBundles(&certBundle, osFamily); err != nil {
return err
}
}
return validateBotterocketConfig(config.BottlerocketConfiguration, osFamily)
}
func validateNTPServers(config *NTPConfiguration) error {
if config == nil {
return nil
}
if len(config.Servers) == 0 {
return errors.New("NTPConfiguration.Servers can not be empty")
}
var invalidServers []string
for _, ntpServer := range config.Servers {
// ParseRequestURI expects a scheme but ntp servers generally don't have one
// Prepending a scheme here so it doesn't fail because of missing scheme
if u, err := url.ParseRequestURI(addNTPScheme(ntpServer)); err != nil || u.Scheme == "" || u.Host == "" {
invalidServers = append(invalidServers, ntpServer)
}
}
if len(invalidServers) != 0 {
return fmt.Errorf("ntp servers [%s] is not valid", strings.Join(invalidServers[:], ", "))
}
return nil
}
func addNTPScheme(server string) string {
if strings.Contains(server, "://") {
return server
}
return fmt.Sprintf("udp://%s", server)
}
func validateCertBundles(config *certBundle, osFamily OSFamily) error {
if config == nil {
return nil
}
if osFamily != Bottlerocket {
return fmt.Errorf("CertBundles can only be used with osFamily: \"%s\"", Bottlerocket)
}
if config.Name == "" {
return errors.New("certBundles name cannot be empty")
}
if err := validateTrustedCertBundle(config.Data); err != nil {
return err
}
return nil
}
func validateBotterocketConfig(config *BottlerocketConfiguration, osFamily OSFamily) error {
if config == nil {
return nil
}
if osFamily != Bottlerocket {
return fmt.Errorf("BottlerocketConfiguration can only be used with osFamily: \"%s\"", Bottlerocket)
}
if err := validateBottlerocketKubernetesConfig(config.Kubernetes); err != nil {
return err
}
if err := validateBottlerocketKernelConfiguration(config.Kernel); err != nil {
return err
}
return validateBottlerocketBootSettingsConfiguration(config.Boot)
}
func validateBottlerocketKubernetesConfig(config *v1beta1.BottlerocketKubernetesSettings) error {
if config == nil {
return nil
}
for _, val := range config.AllowedUnsafeSysctls {
if val == "" {
return errors.New("BottlerocketConfiguration.Kubernetes.AllowedUnsafeSysctls can not have an empty string (\"\")")
}
}
for _, ip := range config.ClusterDNSIPs {
if net.ParseIP(ip) == nil {
return fmt.Errorf("IP address [%s] in BottlerocketConfiguration.Kubernetes.ClusterDNSIPs is not a valid IP", ip)
}
}
if config.MaxPods < 0 {
return errors.New("BottlerocketConfiguration.Kubernetes.MaxPods can not be negative")
}
return nil
}
func validateBottlerocketKernelConfiguration(config *v1beta1.BottlerocketKernelSettings) error {
if config == nil {
return nil
}
for key := range config.SysctlSettings {
if key == "" {
return errors.New("sysctlSettings key cannot be empty")
}
}
return nil
}
func validateBottlerocketBootSettingsConfiguration(config *v1beta1.BottlerocketBootSettings) error {
if config == nil {
return nil
}
for key := range config.BootKernelParameters {
if key == "" {
return fmt.Errorf("bootKernelParameters key cannot be empty")
}
}
return nil
}
// validateTrustedCertBundle validates that the cert is valid.
func validateTrustedCertBundle(certBundle string) error {
var blocks []byte
rest := []byte(certBundle)
// cert bundles could contain more than one certificate
for {
var block *pem.Block
block, rest = pem.Decode(rest)
// no more PEM structed objects
if block == nil {
break
}
blocks = append(blocks, block.Bytes...)
if len(rest) == 0 {
break
}
}
if len(blocks) == 0 {
return fmt.Errorf("failed to parse certificate PEM")
}
_, err := x509.ParseCertificates(blocks)
if err != nil {
return fmt.Errorf("failed to parse certificate: %v", err)
}
return nil
}