mirror of
https://github.com/edgelesssys/constellation.git
synced 2024-10-01 01:36:09 -04:00
365 lines
12 KiB
Go
365 lines
12 KiB
Go
package gcp
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"strings"
|
|
|
|
compute "cloud.google.com/go/compute/apiv1"
|
|
"github.com/edgelesssys/constellation/coordinator/cloudprovider"
|
|
"github.com/edgelesssys/constellation/coordinator/cloudprovider/cloudtypes"
|
|
"github.com/edgelesssys/constellation/coordinator/core"
|
|
"github.com/edgelesssys/constellation/internal/gcpshared"
|
|
"google.golang.org/api/iterator"
|
|
computepb "google.golang.org/genproto/googleapis/cloud/compute/v1"
|
|
"google.golang.org/protobuf/proto"
|
|
)
|
|
|
|
const gcpSSHMetadataKey = "ssh-keys"
|
|
|
|
// Client implements the gcp.API interface.
|
|
type Client struct {
|
|
instanceAPI
|
|
subnetworkAPI
|
|
metadataAPI
|
|
}
|
|
|
|
// NewClient creates a new Client.
|
|
func NewClient(ctx context.Context) (*Client, error) {
|
|
insAPI, err := compute.NewInstancesRESTClient(ctx)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
subnetAPI, err := compute.NewSubnetworksRESTClient(ctx)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &Client{instanceAPI: &instanceClient{insAPI}, subnetworkAPI: &subnetworkClient{subnetAPI}, metadataAPI: &metadataClient{}}, nil
|
|
}
|
|
|
|
// RetrieveInstances returns list of instances including their ips and metadata.
|
|
func (c *Client) RetrieveInstances(ctx context.Context, project, zone string) ([]cloudtypes.Instance, error) {
|
|
uid, err := c.uid()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
req := &computepb.ListInstancesRequest{
|
|
Project: project,
|
|
Zone: zone,
|
|
}
|
|
instanceIterator := c.instanceAPI.List(ctx, req)
|
|
|
|
instances := []cloudtypes.Instance{}
|
|
for {
|
|
resp, err := instanceIterator.Next()
|
|
if err == iterator.Done {
|
|
break
|
|
}
|
|
if err != nil {
|
|
return nil, fmt.Errorf("retrieving instance list from compute API client failed: %w", err)
|
|
}
|
|
metadata := extractInstanceMetadata(resp.Metadata, "", false)
|
|
// skip instances not belonging to the current constellation
|
|
if instanceUID, ok := metadata[core.ConstellationUIDMetadataKey]; !ok || instanceUID != uid {
|
|
continue
|
|
}
|
|
instance, err := convertToCoreInstance(resp, project, zone)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
instances = append(instances, instance)
|
|
}
|
|
return instances, nil
|
|
}
|
|
|
|
// RetrieveInstance returns a an instance including ips and metadata.
|
|
func (c *Client) RetrieveInstance(ctx context.Context, project, zone, instanceName string) (cloudtypes.Instance, error) {
|
|
instance, err := c.getComputeInstance(ctx, project, zone, instanceName)
|
|
if err != nil {
|
|
return cloudtypes.Instance{}, err
|
|
}
|
|
|
|
return convertToCoreInstance(instance, project, zone)
|
|
}
|
|
|
|
// RetrieveProjectID retrieves the GCP projectID containing the current instance.
|
|
func (c *Client) RetrieveProjectID() (string, error) {
|
|
value, err := c.metadataAPI.ProjectID()
|
|
if err != nil {
|
|
return "", fmt.Errorf("requesting GCP projectID failed %w", err)
|
|
}
|
|
return value, nil
|
|
}
|
|
|
|
// RetrieveZone retrieves the GCP zone containing the current instance.
|
|
func (c *Client) RetrieveZone() (string, error) {
|
|
value, err := c.metadataAPI.Zone()
|
|
if err != nil {
|
|
return "", fmt.Errorf("requesting GCP zone failed %w", err)
|
|
}
|
|
return value, nil
|
|
}
|
|
|
|
func (c *Client) RetrieveInstanceName() (string, error) {
|
|
value, err := c.metadataAPI.InstanceName()
|
|
if err != nil {
|
|
return "", fmt.Errorf("requesting GCP instanceName failed %w", err)
|
|
}
|
|
return value, nil
|
|
}
|
|
|
|
func (c *Client) RetrieveInstanceMetadata(attr string) (string, error) {
|
|
value, err := c.metadataAPI.InstanceAttributeValue(attr)
|
|
if err != nil {
|
|
return "", fmt.Errorf("requesting GCP instance metadata failed: %w", err)
|
|
}
|
|
return value, nil
|
|
}
|
|
|
|
// SetInstanceMetadata modifies a key value pair of metadata for the instance specified by project, zone and instanceName.
|
|
func (c *Client) SetInstanceMetadata(ctx context.Context, project, zone, instanceName, key, value string) error {
|
|
instance, err := c.getComputeInstance(ctx, project, zone, instanceName)
|
|
if err != nil {
|
|
return fmt.Errorf("retrieving instance metadata failed: %w", err)
|
|
}
|
|
if instance == nil || instance.Metadata == nil {
|
|
return fmt.Errorf("retrieving instance metadata returned invalid results")
|
|
}
|
|
|
|
// convert instance metadata to map to handle duplicate keys correctly
|
|
metadataMap := extractInstanceMetadata(instance.Metadata, key, false)
|
|
metadataMap[key] = value
|
|
// convert instance metadata back to flat list
|
|
metadata := flattenInstanceMetadata(metadataMap, instance.Metadata.Fingerprint, instance.Metadata.Kind)
|
|
|
|
if err := c.updateInstanceMetadata(ctx, project, zone, instanceName, metadata); err != nil {
|
|
return fmt.Errorf("setting instance metadata %v: %v failed with: %w", key, value, err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// UnsetInstanceMetadata modifies a key value pair of metadata for the instance specified by project, zone and instanceName.
|
|
func (c *Client) UnsetInstanceMetadata(ctx context.Context, project, zone, instanceName, key string) error {
|
|
instance, err := c.getComputeInstance(ctx, project, zone, instanceName)
|
|
if err != nil {
|
|
return fmt.Errorf("retrieving instance metadata failed: %w", err)
|
|
}
|
|
if instance == nil || instance.Metadata == nil {
|
|
return fmt.Errorf("retrieving instance metadata returned invalid results")
|
|
}
|
|
|
|
// convert instance metadata to map to handle duplicate keys correctly
|
|
// and skip the key to be removed
|
|
metadataMap := extractInstanceMetadata(instance.Metadata, key, true)
|
|
|
|
// convert instance metadata back to flat list
|
|
metadata := flattenInstanceMetadata(metadataMap, instance.Metadata.Fingerprint, instance.Metadata.Kind)
|
|
|
|
if err := c.updateInstanceMetadata(ctx, project, zone, instanceName, metadata); err != nil {
|
|
return fmt.Errorf("unsetting instance metadata key %v failed with: %w", key, err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// RetrieveSubnetworkAliasCIDR returns the alias CIDR of the subnetwork specified by project, zone and subnetworkName.
|
|
func (c *Client) RetrieveSubnetworkAliasCIDR(ctx context.Context, project, zone, instanceName string) (string, error) {
|
|
instance, err := c.getComputeInstance(ctx, project, zone, instanceName)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
if instance == nil || instance.NetworkInterfaces == nil || len(instance.NetworkInterfaces) == 0 || instance.NetworkInterfaces[0].Subnetwork == nil {
|
|
return "", fmt.Errorf("retrieving instance network interfaces failed")
|
|
}
|
|
subnetworkURL := *instance.NetworkInterfaces[0].Subnetwork
|
|
subnetworkURLFragments := strings.Split(subnetworkURL, "/")
|
|
subnetworkName := subnetworkURLFragments[len(subnetworkURLFragments)-1]
|
|
|
|
// convert:
|
|
// zone --> region
|
|
// europe-west3-b --> europe-west3
|
|
regionParts := strings.Split(zone, "-")
|
|
region := strings.TrimSuffix(zone, "-"+regionParts[len(regionParts)-1])
|
|
|
|
req := &computepb.GetSubnetworkRequest{
|
|
Project: project,
|
|
Region: region,
|
|
Subnetwork: subnetworkName,
|
|
}
|
|
subnetwork, err := c.subnetworkAPI.Get(ctx, req)
|
|
if err != nil {
|
|
return "", fmt.Errorf("retrieving subnetwork alias CIDR failed: %w", err)
|
|
}
|
|
if subnetwork == nil || subnetwork.IpCidrRange == nil || *subnetwork.IpCidrRange == "" {
|
|
return "", fmt.Errorf("retrieving subnetwork alias CIDR returned invalid results")
|
|
}
|
|
return *subnetwork.IpCidrRange, nil
|
|
}
|
|
|
|
// Close closes the instanceAPI client.
|
|
func (c *Client) Close() error {
|
|
if err := c.subnetworkAPI.Close(); err != nil {
|
|
return err
|
|
}
|
|
return c.instanceAPI.Close()
|
|
}
|
|
|
|
func (c *Client) getComputeInstance(ctx context.Context, project, zone, instanceName string) (*computepb.Instance, error) {
|
|
instanceGetReq := &computepb.GetInstanceRequest{
|
|
Project: project,
|
|
Zone: zone,
|
|
Instance: instanceName,
|
|
}
|
|
instance, err := c.instanceAPI.Get(ctx, instanceGetReq)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("retrieving compute instance failed: %w", err)
|
|
}
|
|
return instance, nil
|
|
}
|
|
|
|
// updateInstanceMetadata updates all instance metadata key-value pairs.
|
|
func (c *Client) updateInstanceMetadata(ctx context.Context, project, zone, instanceName string, metadata *computepb.Metadata) error {
|
|
setMetadataReq := &computepb.SetMetadataInstanceRequest{
|
|
Project: project,
|
|
Zone: zone,
|
|
Instance: instanceName,
|
|
MetadataResource: metadata,
|
|
}
|
|
|
|
if _, err := c.instanceAPI.SetMetadata(ctx, setMetadataReq); err != nil {
|
|
return fmt.Errorf("updating instance metadata failed: %w", err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// uid retrieves the current instances uid.
|
|
func (c *Client) uid() (string, error) {
|
|
// API endpoint: http://metadata.google.internal/computeMetadata/v1/instance/attributes/constellation-uid
|
|
uid, err := c.RetrieveInstanceMetadata(core.ConstellationUIDMetadataKey)
|
|
if err != nil {
|
|
return "", fmt.Errorf("retrieving constellation uid failed: %w", err)
|
|
}
|
|
return uid, nil
|
|
}
|
|
|
|
// extractPrivateIPs extracts private interface IPs from a list of interfaces.
|
|
func extractPrivateIPs(interfaces []*computepb.NetworkInterface) []string {
|
|
ips := []string{}
|
|
for _, interf := range interfaces {
|
|
if interf == nil || interf.NetworkIP == nil {
|
|
continue
|
|
}
|
|
ips = append(ips, *interf.NetworkIP)
|
|
}
|
|
return ips
|
|
}
|
|
|
|
// extractPublicIPs extracts public interface IPs from a list of interfaces.
|
|
func extractPublicIPs(interfaces []*computepb.NetworkInterface) []string {
|
|
ips := []string{}
|
|
for _, interf := range interfaces {
|
|
if interf == nil || interf.AccessConfigs == nil {
|
|
continue
|
|
}
|
|
for _, accessConfig := range interf.AccessConfigs {
|
|
if accessConfig == nil || accessConfig.NatIP == nil {
|
|
continue
|
|
}
|
|
ips = append(ips, *accessConfig.NatIP)
|
|
}
|
|
}
|
|
return ips
|
|
}
|
|
|
|
// extractAliasIPRanges extracts alias interface IPs from a list of interfaces.
|
|
func extractAliasIPRanges(interfaces []*computepb.NetworkInterface) []string {
|
|
ips := []string{}
|
|
for _, interf := range interfaces {
|
|
if interf == nil || interf.AliasIpRanges == nil {
|
|
continue
|
|
}
|
|
for _, aliasIP := range interf.AliasIpRanges {
|
|
if aliasIP == nil || aliasIP.IpCidrRange == nil {
|
|
continue
|
|
}
|
|
ips = append(ips, *aliasIP.IpCidrRange)
|
|
}
|
|
}
|
|
return ips
|
|
}
|
|
|
|
// extractSSHKeys extracts SSH keys from GCP instance metadata.
|
|
// reference: https://cloud.google.com/compute/docs/connect/add-ssh-keys .
|
|
func extractSSHKeys(metadata map[string]string) map[string][]string {
|
|
sshKeysRaw, ok := metadata[gcpSSHMetadataKey]
|
|
if !ok {
|
|
// ignore missing metadata entry
|
|
return map[string][]string{}
|
|
}
|
|
|
|
sshKeyLines := strings.Split(sshKeysRaw, "\n")
|
|
keys := map[string][]string{}
|
|
for _, sshKeyRaw := range sshKeyLines {
|
|
keyParts := strings.SplitN(sshKeyRaw, ":", 2)
|
|
if len(keyParts) != 2 {
|
|
continue
|
|
}
|
|
username := keyParts[0]
|
|
keyParts = strings.SplitN(keyParts[1], " ", 3)
|
|
if len(keyParts) < 2 {
|
|
continue
|
|
}
|
|
keyValue := fmt.Sprintf("%s %s", keyParts[0], keyParts[1])
|
|
keys[username] = append(keys[username], keyValue)
|
|
}
|
|
return keys
|
|
}
|
|
|
|
// convertToCoreInstance converts a *computepb.Instance to a core.Instance.
|
|
func convertToCoreInstance(in *computepb.Instance, project string, zone string) (cloudtypes.Instance, error) {
|
|
if in.Name == nil {
|
|
return cloudtypes.Instance{}, fmt.Errorf("retrieving instance from compute API client returned invalid instance Name: %v", in.Name)
|
|
}
|
|
metadata := extractInstanceMetadata(in.Metadata, "", false)
|
|
return cloudtypes.Instance{
|
|
Name: *in.Name,
|
|
ProviderID: gcpshared.JoinProviderID(project, zone, *in.Name),
|
|
Role: cloudprovider.ExtractRole(metadata),
|
|
PrivateIPs: extractPrivateIPs(in.NetworkInterfaces),
|
|
PublicIPs: extractPublicIPs(in.NetworkInterfaces),
|
|
AliasIPRanges: extractAliasIPRanges(in.NetworkInterfaces),
|
|
SSHKeys: extractSSHKeys(metadata),
|
|
}, nil
|
|
}
|
|
|
|
// extractInstanceMetadata will extract the list of instance metadata key-value pairs into a map.
|
|
// If "skipKey" is true, "key" will be skipped.
|
|
func extractInstanceMetadata(in *computepb.Metadata, key string, skipKey bool) map[string]string {
|
|
metadataMap := map[string]string{}
|
|
for _, item := range in.Items {
|
|
if item == nil || item.Key == nil || item.Value == nil {
|
|
continue
|
|
}
|
|
if skipKey && *item.Key == key {
|
|
continue
|
|
}
|
|
metadataMap[*item.Key] = *item.Value
|
|
}
|
|
return metadataMap
|
|
}
|
|
|
|
// flattenInstanceMetadata takes a map of metadata key-value pairs and returns a flat list of computepb.Items inside computepb.Metadata.
|
|
func flattenInstanceMetadata(metadataMap map[string]string, fingerprint, kind *string) *computepb.Metadata {
|
|
metadata := &computepb.Metadata{
|
|
Fingerprint: fingerprint,
|
|
Kind: kind,
|
|
Items: make([]*computepb.Items, len(metadataMap)),
|
|
}
|
|
i := 0
|
|
for mapKey, mapValue := range metadataMap {
|
|
metadata.Items[i] = &computepb.Items{Key: proto.String(mapKey), Value: proto.String(mapValue)}
|
|
i++
|
|
}
|
|
return metadata
|
|
}
|