/
secure-instance.go
423 lines (382 loc) · 11.9 KB
/
secure-instance.go
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package awscloud
import (
"encoding/base64"
"fmt"
"strings"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/sirupsen/logrus"
)
type SecureInstance struct {
FleetID string
SGID string
LTID string
Instance *ec2.Instance
}
// SecureInstanceUserData returns the cloud-init user data for a secure instance.
func SecureInstanceUserData(CloudWatchGroup string) string {
additionalFiles := ""
if CloudWatchGroup != "" {
additionalFiles += fmt.Sprintf(` - path: /tmp/cloud_init_vars
content: |
OSBUILD_EXECUTOR_CLOUDWATCH_GROUP='%s'
`, CloudWatchGroup)
}
return fmt.Sprintf(`#cloud-config
write_files:
- path: /tmp/worker-run-executor-service
content: ''
%s`, additionalFiles)
}
// Runs an instance with a security group that only allows traffic to
// the host. Will replace resources if they already exists.
func (a *AWS) RunSecureInstance(iamProfile, keyName, CloudWatchGroup string) (*SecureInstance, error) {
identity, err := a.ec2metadata.GetInstanceIdentityDocument()
if err != nil {
logrus.Errorf("Error getting the identity document, %s", err)
return nil, err
}
descrInstancesOutput, err := a.ec2.DescribeInstances(&ec2.DescribeInstancesInput{
InstanceIds: []*string{
aws.String(identity.InstanceID),
},
})
if err != nil {
return nil, err
}
if len(descrInstancesOutput.Reservations) != 1 || len(descrInstancesOutput.Reservations[0].Instances) != 1 {
return nil, fmt.Errorf("Expected exactly one reservation (got %d) with one instance (got %d)", len(descrInstancesOutput.Reservations), len(descrInstancesOutput.Reservations[0].Instances))
}
vpcID := *descrInstancesOutput.Reservations[0].Instances[0].VpcId
imageID := *descrInstancesOutput.Reservations[0].Instances[0].ImageId
instanceType := *descrInstancesOutput.Reservations[0].Instances[0].InstanceType
subnetID := *descrInstancesOutput.Reservations[0].Instances[0].SubnetId
secureInstance := &SecureInstance{}
defer func() {
if secureInstance.Instance == nil {
logrus.Errorf("Unable to create secure instance, deleting resources")
if err := a.TerminateSecureInstance(secureInstance); err != nil {
logrus.Errorf("Deleting secure instance in defer unsuccessful: %v", err)
}
}
}()
sgID, err := a.createOrReplaceSG(identity.InstanceID, identity.PrivateIP, vpcID)
if sgID != "" {
secureInstance.SGID = sgID
}
if err != nil {
return nil, err
}
ltID, err := a.createOrReplaceLT(identity.InstanceID, imageID, sgID, instanceType, iamProfile, keyName, CloudWatchGroup)
if ltID != "" {
secureInstance.LTID = ltID
}
if err != nil {
return nil, err
}
descrSubnetsOutput, err := a.ec2.DescribeSubnets(&ec2.DescribeSubnetsInput{
Filters: []*ec2.Filter{
&ec2.Filter{
Name: aws.String("vpc-id"),
Values: []*string{
aws.String(vpcID),
},
},
},
})
if err != nil {
return nil, err
}
if len(descrSubnetsOutput.Subnets) == 0 {
return nil, fmt.Errorf("Expected at least 1 subnet in the VPC, got 0")
}
createFleetOutput, err := a.ec2.CreateFleet(&ec2.CreateFleetInput{
LaunchTemplateConfigs: []*ec2.FleetLaunchTemplateConfigRequest{
&ec2.FleetLaunchTemplateConfigRequest{
LaunchTemplateSpecification: &ec2.FleetLaunchTemplateSpecificationRequest{
LaunchTemplateId: aws.String(secureInstance.LTID),
Version: aws.String("1"),
},
Overrides: []*ec2.FleetLaunchTemplateOverridesRequest{
&ec2.FleetLaunchTemplateOverridesRequest{
SubnetId: aws.String(subnetID),
},
},
},
},
TagSpecifications: []*ec2.TagSpecification{
&ec2.TagSpecification{
ResourceType: aws.String(ec2.ResourceTypeInstance),
Tags: []*ec2.Tag{
&ec2.Tag{
Key: aws.String("parent"),
Value: aws.String(identity.InstanceID),
},
},
},
},
TargetCapacitySpecification: &ec2.TargetCapacitySpecificationRequest{
DefaultTargetCapacityType: aws.String(ec2.DefaultTargetCapacityTypeSpot),
TotalTargetCapacity: aws.Int64(1),
},
SpotOptions: &ec2.SpotOptionsRequest{
AllocationStrategy: aws.String(ec2.SpotAllocationStrategyPriceCapacityOptimized),
},
Type: aws.String(ec2.FleetTypeInstant),
})
if err != nil {
return nil, err
}
if len(createFleetOutput.Errors) > 0 {
fleetErrs := []string{}
for _, fleetErr := range createFleetOutput.Errors {
fleetErrs = append(fleetErrs, *fleetErr.ErrorMessage)
}
return nil, fmt.Errorf("Unable to create fleet: %v", strings.Join(fleetErrs, "; "))
}
secureInstance.FleetID = *createFleetOutput.FleetId
if len(createFleetOutput.Instances) != 1 {
return nil, fmt.Errorf("Unable to create fleet with exactly one instance, got %d instances", len(createFleetOutput.Instances))
}
if len(createFleetOutput.Instances[0].InstanceIds) != 1 {
return nil, fmt.Errorf("Expected exactly one instance ID on fleet %v, got %d", secureInstance.FleetID, len(createFleetOutput.Instances[0].InstanceIds))
}
instanceID := createFleetOutput.Instances[0].InstanceIds[0]
err = a.ec2.WaitUntilInstanceStatusOk(&ec2.DescribeInstanceStatusInput{
InstanceIds: []*string{
instanceID,
},
})
if err != nil {
return nil, err
}
descrInstOutput, err := a.ec2.DescribeInstances(&ec2.DescribeInstancesInput{
InstanceIds: []*string{
instanceID,
},
})
if err != nil {
return nil, err
}
if len(descrInstOutput.Reservations) != 1 {
return nil, fmt.Errorf("Expected exactly 1 reservation for instance: %s, got %d", *instanceID, len(descrInstOutput.Reservations))
}
if len(descrInstOutput.Reservations[0].Instances) != 1 {
return nil, fmt.Errorf("Expected exactly 1 instance for instance: %s, got %d", *instanceID, len(descrInstOutput.Reservations[0].Instances))
}
secureInstance.Instance = descrInstOutput.Reservations[0].Instances[0]
return secureInstance, nil
}
func (a *AWS) TerminateSecureInstance(si *SecureInstance) error {
if err := a.deleteFleetIfExists(si); err != nil {
return err
}
if err := a.deleteSGIfExists(si); err != nil {
return err
}
if err := a.deleteLTIfExists(si); err != nil {
return err
}
return nil
}
func isInvalidGroupNotFoundErr(err error) bool {
if awsErr, ok := err.(awserr.Error); ok {
if awsErr.Code() == "InvalidGroup.NotFound" {
return true
}
}
return false
}
func (a *AWS) createOrReplaceSG(hostInstanceID, hostIP, vpcID string) (string, error) {
sgName := fmt.Sprintf("SG for %s (%s)", hostInstanceID, hostIP)
descrSGOutput, err := a.ec2.DescribeSecurityGroups(&ec2.DescribeSecurityGroupsInput{
Filters: []*ec2.Filter{
&ec2.Filter{
Name: aws.String("group-name"),
Values: []*string{
aws.String(sgName),
},
},
},
})
if err != nil && !isInvalidGroupNotFoundErr(err) {
return "", err
}
for _, sg := range descrSGOutput.SecurityGroups {
_, err := a.ec2.DeleteSecurityGroup(&ec2.DeleteSecurityGroupInput{
GroupId: sg.GroupId,
})
if err != nil {
return "", err
}
}
cSGOutput, err := a.ec2.CreateSecurityGroup(&ec2.CreateSecurityGroupInput{
Description: aws.String(sgName),
GroupName: aws.String(sgName),
VpcId: aws.String(vpcID),
})
if err != nil {
return "", err
}
sgID := *cSGOutput.GroupId
sgIngressOutput, err := a.ec2.AuthorizeSecurityGroupIngress(&ec2.AuthorizeSecurityGroupIngressInput{
GroupId: aws.String(sgID),
IpPermissions: []*ec2.IpPermission{
&ec2.IpPermission{
IpProtocol: aws.String(ec2.ProtocolTcp),
FromPort: aws.Int64(1),
ToPort: aws.Int64(65535),
IpRanges: []*ec2.IpRange{
&ec2.IpRange{
CidrIp: aws.String(fmt.Sprintf("%s/32", hostIP)),
},
},
},
},
})
if err != nil {
return sgID, err
}
if !*sgIngressOutput.Return {
return sgID, fmt.Errorf("Unable to attach ingress rules to SG")
}
describeSGOutput, err := a.ec2.DescribeSecurityGroups(&ec2.DescribeSecurityGroupsInput{
GroupIds: []*string{
aws.String(sgID),
},
})
if err != nil {
return sgID, err
}
// SGs are created with a predefind egress rule that allows all outgoing traffic, so expecting 1 outbound rule
if len(describeSGOutput.SecurityGroups[0].IpPermissions) != 1 || len(describeSGOutput.SecurityGroups[0].IpPermissionsEgress) != 1 {
return sgID, fmt.Errorf("Expected 2 security group rules: 1 inbound (got %d) and 1 outbound (got %d)",
len(describeSGOutput.SecurityGroups[0].IpPermissions), len(describeSGOutput.SecurityGroups[0].IpPermissionsEgress))
}
return sgID, nil
}
func isLaunchTemplateNotFoundError(err error) bool {
if awsErr, ok := err.(awserr.Error); ok {
if awsErr.Code() == "InvalidLaunchTemplateId.NotFound" || awsErr.Code() == "InvalidLaunchTemplateName.NotFoundException" {
return true
}
}
return false
}
func (a *AWS) createOrReplaceLT(hostInstanceID, imageID, sgID, instanceType, iamProfile, keyName, CloudWatchGroup string) (string, error) {
ltName := fmt.Sprintf("launch-template-for-%s-runner-instance", hostInstanceID)
descrLTOutput, err := a.ec2.DescribeLaunchTemplates(&ec2.DescribeLaunchTemplatesInput{
LaunchTemplateNames: []*string{
aws.String(ltName),
},
})
if len(descrLTOutput.LaunchTemplates) == 1 {
_, err := a.ec2.DeleteLaunchTemplate(&ec2.DeleteLaunchTemplateInput{
LaunchTemplateId: descrLTOutput.LaunchTemplates[0].LaunchTemplateId,
})
if err != nil {
return "", err
}
}
if err != nil && !isLaunchTemplateNotFoundError(err) {
return "", err
}
input := &ec2.CreateLaunchTemplateInput{
LaunchTemplateData: &ec2.RequestLaunchTemplateData{
ImageId: aws.String(imageID),
InstanceInitiatedShutdownBehavior: aws.String(ec2.ShutdownBehaviorTerminate),
InstanceType: aws.String(instanceType),
BlockDeviceMappings: []*ec2.LaunchTemplateBlockDeviceMappingRequest{
&ec2.LaunchTemplateBlockDeviceMappingRequest{
DeviceName: aws.String("/dev/sda1"),
Ebs: &ec2.LaunchTemplateEbsBlockDeviceRequest{
DeleteOnTermination: aws.Bool(true),
Encrypted: aws.Bool(true),
VolumeSize: aws.Int64(50),
VolumeType: aws.String(ec2.VolumeTypeGp3),
},
},
},
SecurityGroupIds: []*string{
aws.String(sgID),
},
UserData: aws.String(base64.StdEncoding.EncodeToString([]byte(SecureInstanceUserData(CloudWatchGroup)))),
},
TagSpecifications: []*ec2.TagSpecification{
&ec2.TagSpecification{
ResourceType: aws.String(ec2.ResourceTypeLaunchTemplate),
Tags: []*ec2.Tag{
&ec2.Tag{
Key: aws.String("parent"),
Value: aws.String(hostInstanceID),
},
},
},
},
LaunchTemplateName: aws.String(ltName),
}
if iamProfile != "" {
input.LaunchTemplateData.IamInstanceProfile = &ec2.LaunchTemplateIamInstanceProfileSpecificationRequest{
Name: aws.String(iamProfile),
}
}
if keyName != "" {
input.LaunchTemplateData.KeyName = aws.String(keyName)
}
createLaunchTemplateOutput, err := a.ec2.CreateLaunchTemplate(input)
if err != nil {
return "", err
}
return *createLaunchTemplateOutput.LaunchTemplate.LaunchTemplateId, nil
}
func (a *AWS) deleteFleetIfExists(si *SecureInstance) error {
if si.FleetID == "" {
return nil
}
delFlOutput, err := a.ec2.DeleteFleets(&ec2.DeleteFleetsInput{
FleetIds: []*string{
aws.String(si.FleetID),
},
TerminateInstances: aws.Bool(true),
})
if err != nil {
return err
}
if len(delFlOutput.UnsuccessfulFleetDeletions) != 0 || len(delFlOutput.SuccessfulFleetDeletions) != 1 {
return fmt.Errorf("Deleting fleet unsuccessful")
}
err = a.ec2.WaitUntilInstanceTerminated(&ec2.DescribeInstancesInput{
InstanceIds: []*string{
si.Instance.InstanceId,
},
})
if err == nil {
si.FleetID = ""
}
return err
}
func (a *AWS) deleteLTIfExists(si *SecureInstance) error {
if si.LTID == "" {
return nil
}
_, err := a.ec2.DeleteLaunchTemplate(&ec2.DeleteLaunchTemplateInput{
LaunchTemplateId: aws.String(si.LTID),
})
if err == nil {
si.LTID = ""
}
return err
}
func (a *AWS) deleteSGIfExists(si *SecureInstance) error {
if si.SGID == "" {
return nil
}
_, err := a.ec2.DeleteSecurityGroup(&ec2.DeleteSecurityGroupInput{
GroupId: aws.String(si.SGID),
})
if err == nil {
si.SGID = ""
}
return err
}