mirror of
https://github.com/gravitational/teleport.git
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130 lines
3.8 KiB
Go
130 lines
3.8 KiB
Go
/*
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Copyright 2022 Gravitational, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cloud
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import (
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"context"
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"time"
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"github.com/gravitational/trace"
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"github.com/gravitational/teleport/api/types"
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"github.com/gravitational/teleport/lib/cloud/aws"
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"github.com/gravitational/teleport/lib/cloud/azure"
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)
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const (
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// discoverInstanceMetadataTimeout is the maximum amount of time allowed
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// to discover an instance metadata service. The timeout is short to
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// minimize Teleport's startup time when it isn't running on any cloud
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// instance. Checking for instance metadata typically takes less than 30ms.
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discoverInstanceMetadataTimeout = 500 * time.Millisecond
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)
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// InstanceMetadata is an interface for fetching information from a cloud
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// service's instance metadata.
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type InstanceMetadata interface {
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// IsAvailable checks if instance metadata is available.
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IsAvailable(ctx context.Context) bool
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// GetTags gets all of the instance's tags.
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GetTags(ctx context.Context) (map[string]string, error)
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// GetHostname gets the hostname set by the cloud instance that Teleport
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// should use, if any.
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GetHostname(ctx context.Context) (string, error)
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// GetType gets the cloud instance type.
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GetType() types.InstanceMetadataType
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// GetID gets the cloud instance ID.
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GetID(ctx context.Context) (string, error)
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}
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type imConstructor func(ctx context.Context) (InstanceMetadata, error)
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var providers = map[types.InstanceMetadataType]imConstructor{
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types.InstanceMetadataTypeEC2: initEC2,
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types.InstanceMetadataTypeAzure: initAzure,
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}
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func initEC2(ctx context.Context) (InstanceMetadata, error) {
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im, err := aws.NewInstanceMetadataClient(ctx)
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return im, trace.Wrap(err)
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}
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func initAzure(ctx context.Context) (InstanceMetadata, error) {
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return azure.NewInstanceMetadataClient(), nil
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}
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// DiscoverInstanceMetadata checks which cloud instance type Teleport is
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// running on, if any.
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func DiscoverInstanceMetadata(ctx context.Context) (InstanceMetadata, error) {
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ctx, cancel := context.WithTimeout(ctx, discoverInstanceMetadataTimeout)
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defer cancel()
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c := make(chan InstanceMetadata)
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clients := make([]InstanceMetadata, 0, len(providers))
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for _, constructor := range providers {
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im, err := constructor(ctx)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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clients = append(clients, im)
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}
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for _, client := range clients {
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client := client
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go func() {
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if client.IsAvailable(ctx) {
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c <- client
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}
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}()
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}
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select {
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case client := <-c:
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return client, nil
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case <-ctx.Done():
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return nil, trace.NotFound("no instance metadata service found")
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}
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}
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// DisabledIMDSClient is an EC2 instance metadata client that is always disabled. This is faster
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// than the default client when not testing instance metadata behavior.
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type DisabledIMDSClient struct{}
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// NewDisabledIMDSClient creates a new DisabledIMDSClient.
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func NewDisabledIMDSClient() InstanceMetadata {
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return &DisabledIMDSClient{}
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}
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func (d *DisabledIMDSClient) IsAvailable(ctx context.Context) bool {
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return false
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}
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func (d *DisabledIMDSClient) GetTags(ctx context.Context) (map[string]string, error) {
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return nil, nil
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}
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func (d *DisabledIMDSClient) GetHostname(ctx context.Context) (string, error) {
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return "", nil
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}
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func (d *DisabledIMDSClient) GetType() types.InstanceMetadataType {
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return types.InstanceMetadataTypeDisabled
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}
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func (d *DisabledIMDSClient) GetID(ctx context.Context) (string, error) {
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return "", nil
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}
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