constellation/internal/cloud/azure/metadata.go
2022-08-31 14:10:08 +02:00

333 lines
10 KiB
Go

package azure
import (
"context"
"fmt"
"net/http"
"regexp"
"github.com/Azure/azure-sdk-for-go/sdk/azidentity"
"github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/applicationinsights/armapplicationinsights"
armcomputev2 "github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/compute/armcompute/v2"
"github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/network/armnetwork"
"github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/resources/armresources"
"github.com/edgelesssys/constellation/internal/cloud/metadata"
)
var (
publicIPAddressRegexp = regexp.MustCompile(`/subscriptions/[^/]+/resourceGroups/[^/]+/providers/Microsoft.Network/publicIPAddresses/(?P<IPname>[^/]+)`)
keyPathRegexp = regexp.MustCompile(`^\/home\/([^\/]+)\/\.ssh\/authorized_keys$`)
)
// Metadata implements azure metadata APIs.
type Metadata struct {
imdsAPI
virtualNetworksAPI
securityGroupsAPI
networkInterfacesAPI
publicIPAddressesAPI
scaleSetsAPI
loadBalancerAPI
virtualMachineScaleSetVMsAPI
tagsAPI
applicationInsightsAPI
}
// NewMetadata creates a new Metadata.
func NewMetadata(ctx context.Context) (*Metadata, error) {
cred, err := azidentity.NewDefaultAzureCredential(nil)
if err != nil {
return nil, err
}
// The default http client may use a system-wide proxy and it is recommended to disable the proxy explicitly:
// https://docs.microsoft.com/en-us/azure/virtual-machines/windows/instance-metadata-service?tabs=linux#proxies
// See also: https://github.com/microsoft/azureimds/blob/master/imdssample.go#L10
imdsAPI := imdsClient{
client: &http.Client{Transport: &http.Transport{Proxy: nil}},
}
subscriptionID, err := imdsAPI.SubscriptionID(ctx)
if err != nil {
return nil, err
}
virtualNetworksAPI, err := armnetwork.NewVirtualNetworksClient(subscriptionID, cred, nil)
if err != nil {
return nil, err
}
networkInterfacesAPI, err := armnetwork.NewInterfacesClient(subscriptionID, cred, nil)
if err != nil {
return nil, err
}
publicIPAddressesAPI, err := armnetwork.NewPublicIPAddressesClient(subscriptionID, cred, nil)
if err != nil {
return nil, err
}
securityGroupsAPI, err := armnetwork.NewSecurityGroupsClient(subscriptionID, cred, nil)
if err != nil {
return nil, err
}
scaleSetsAPI, err := armcomputev2.NewVirtualMachineScaleSetsClient(subscriptionID, cred, nil)
if err != nil {
return nil, err
}
loadBalancerAPI, err := armnetwork.NewLoadBalancersClient(subscriptionID, cred, nil)
if err != nil {
return nil, err
}
virtualMachineScaleSetVMsAPI, err := armcomputev2.NewVirtualMachineScaleSetVMsClient(subscriptionID, cred, nil)
if err != nil {
return nil, err
}
tagsAPI, err := armresources.NewTagsClient(subscriptionID, cred, nil)
if err != nil {
return nil, err
}
applicationInsightsAPI, err := armapplicationinsights.NewComponentsClient(subscriptionID, cred, nil)
if err != nil {
return nil, err
}
return &Metadata{
imdsAPI: &imdsAPI,
virtualNetworksAPI: virtualNetworksAPI,
networkInterfacesAPI: networkInterfacesAPI,
securityGroupsAPI: securityGroupsAPI,
publicIPAddressesAPI: publicIPAddressesAPI,
loadBalancerAPI: loadBalancerAPI,
scaleSetsAPI: scaleSetsAPI,
virtualMachineScaleSetVMsAPI: virtualMachineScaleSetVMsAPI,
tagsAPI: tagsAPI,
applicationInsightsAPI: applicationInsightsAPI,
}, nil
}
// List retrieves all instances belonging to the current constellation.
func (m *Metadata) List(ctx context.Context) ([]metadata.InstanceMetadata, error) {
resourceGroup, err := m.imdsAPI.ResourceGroup(ctx)
if err != nil {
return nil, err
}
scaleSetInstances, err := m.listScaleSetVMs(ctx, resourceGroup)
if err != nil {
return nil, err
}
return scaleSetInstances, nil
}
// Self retrieves the current instance.
func (m *Metadata) Self(ctx context.Context) (metadata.InstanceMetadata, error) {
providerID, err := m.providerID(ctx)
if err != nil {
return metadata.InstanceMetadata{}, err
}
return m.GetInstance(ctx, providerID)
}
// GetInstance retrieves an instance using its providerID.
func (m *Metadata) GetInstance(ctx context.Context, providerID string) (metadata.InstanceMetadata, error) {
instance, scaleSetErr := m.getScaleSetVM(ctx, providerID)
if scaleSetErr == nil {
return instance, nil
}
return metadata.InstanceMetadata{}, fmt.Errorf("retrieving instance given providerID %v: %w", providerID, scaleSetErr)
}
// GetNetworkSecurityGroupName returns the security group name of the resource group.
func (m *Metadata) GetNetworkSecurityGroupName(ctx context.Context) (string, error) {
resourceGroup, err := m.imdsAPI.ResourceGroup(ctx)
if err != nil {
return "", err
}
nsg, err := m.getNetworkSecurityGroup(ctx, resourceGroup)
if err != nil {
return "", err
}
if nsg == nil || nsg.Name == nil {
return "", fmt.Errorf("could not dereference network security group name")
}
return *nsg.Name, nil
}
// GetSubnetworkCIDR retrieves the subnetwork CIDR from cloud provider metadata.
func (m *Metadata) GetSubnetworkCIDR(ctx context.Context) (string, error) {
resourceGroup, err := m.imdsAPI.ResourceGroup(ctx)
if err != nil {
return "", err
}
virtualNetwork, err := m.getVirtualNetwork(ctx, resourceGroup)
if err != nil {
return "", err
}
if virtualNetwork == nil || virtualNetwork.Properties == nil || len(virtualNetwork.Properties.Subnets) == 0 ||
virtualNetwork.Properties.Subnets[0].Properties == nil || virtualNetwork.Properties.Subnets[0].Properties.AddressPrefix == nil {
return "", fmt.Errorf("could not retrieve subnetwork CIDR from virtual network %v", virtualNetwork)
}
return *virtualNetwork.Properties.Subnets[0].Properties.AddressPrefix, nil
}
// UID retrieves the UID of the constellation.
func (m *Metadata) UID(ctx context.Context) (string, error) {
return m.imdsAPI.UID(ctx)
}
// getLoadBalancer retrieves the load balancer from cloud provider metadata.
func (m *Metadata) getLoadBalancer(ctx context.Context) (*armnetwork.LoadBalancer, error) {
resourceGroup, err := m.imdsAPI.ResourceGroup(ctx)
if err != nil {
return nil, err
}
pager := m.loadBalancerAPI.NewListPager(resourceGroup, nil)
for pager.More() {
page, err := pager.NextPage(ctx)
if err != nil {
return nil, fmt.Errorf("retrieving loadbalancer page: %w", err)
}
for _, lb := range page.Value {
if lb != nil && lb.Properties != nil {
return lb, nil
}
}
}
return nil, fmt.Errorf("could not get any load balancer")
}
// SupportsLoadBalancer returns true if the cloud provider supports load balancers.
func (m *Metadata) SupportsLoadBalancer() bool {
return true
}
// GetLoadBalancerName returns the load balancer name of the resource group.
func (m *Metadata) GetLoadBalancerName(ctx context.Context) (string, error) {
lb, err := m.getLoadBalancer(ctx)
if err != nil {
return "", err
}
if lb == nil || lb.Name == nil {
return "", fmt.Errorf("could not dereference load balancer name")
}
return *lb.Name, nil
}
// GetLoadBalancerEndpoint retrieves the first load balancer IP from cloud provider metadata.
//
// The returned string is an IP address without a port, but the method name needs to satisfy the
// metadata interface.
func (m *Metadata) GetLoadBalancerEndpoint(ctx context.Context) (string, error) {
lb, err := m.getLoadBalancer(ctx)
if err != nil {
return "", err
}
if lb == nil || lb.Properties == nil {
return "", fmt.Errorf("could not dereference load balancer IP configuration")
}
var pubIPID string
for _, fipConf := range lb.Properties.FrontendIPConfigurations {
if fipConf == nil || fipConf.Properties == nil || fipConf.Properties.PublicIPAddress == nil || fipConf.Properties.PublicIPAddress.ID == nil {
continue
}
pubIPID = *fipConf.Properties.PublicIPAddress.ID
break
}
if pubIPID == "" {
return "", fmt.Errorf("could not find public IP address reference in load balancer")
}
matches := publicIPAddressRegexp.FindStringSubmatch(pubIPID)
if len(matches) != 2 {
return "", fmt.Errorf("could not find public IP address name in load balancer: %v", pubIPID)
}
pubIPName := matches[1]
resourceGroup, err := m.imdsAPI.ResourceGroup(ctx)
if err != nil {
return "", err
}
resp, err := m.publicIPAddressesAPI.Get(ctx, resourceGroup, pubIPName, nil)
if err != nil {
return "", fmt.Errorf("could not retrieve public IP address: %w", err)
}
if resp.Properties == nil || resp.Properties.IPAddress == nil {
return "", fmt.Errorf("could not resolve public IP address reference for load balancer")
}
return *resp.Properties.IPAddress, nil
}
// Supported is used to determine if metadata API is implemented for this cloud provider.
func (m *Metadata) Supported() bool {
return true
}
// providerID retrieves the current instances providerID.
func (m *Metadata) providerID(ctx context.Context) (string, error) {
providerID, err := m.imdsAPI.ProviderID(ctx)
if err != nil {
return "", err
}
return "azure://" + providerID, nil
}
func (m *Metadata) getAppInsights(ctx context.Context) (*armapplicationinsights.Component, error) {
resourceGroup, err := m.imdsAPI.ResourceGroup(ctx)
if err != nil {
return nil, err
}
uid, err := m.UID(ctx)
if err != nil {
return nil, err
}
pager := m.applicationInsightsAPI.NewListByResourceGroupPager(resourceGroup, nil)
for pager.More() {
nextResult, err := pager.NextPage(ctx)
if err != nil {
return nil, fmt.Errorf("retrieving application insights page: %w", err)
}
for _, component := range nextResult.Value {
if component == nil || component.Tags == nil {
continue
}
if *component.Tags["uid"] == uid {
return component, nil
}
}
}
return nil, fmt.Errorf("could not find correctly tagged application insights")
}
// extractInstanceTags converts azure tags into metadata key-value pairs.
func extractInstanceTags(tags map[string]*string) map[string]string {
metadataMap := map[string]string{}
for key, value := range tags {
if value == nil {
continue
}
metadataMap[key] = *value
}
return metadataMap
}
// extractSSHKeys extracts SSH public keys from azure instance OS Profile.
func extractSSHKeys(sshConfig armcomputev2.SSHConfiguration) map[string][]string {
sshKeys := map[string][]string{}
for _, key := range sshConfig.PublicKeys {
if key == nil || key.Path == nil || key.KeyData == nil {
continue
}
matches := keyPathRegexp.FindStringSubmatch(*key.Path)
if len(matches) != 2 {
continue
}
sshKeys[matches[1]] = append(sshKeys[matches[1]], *key.KeyData)
}
return sshKeys
}