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step_key_pair.go
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160 lines (132 loc) · 4.37 KB
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// Copyright IBM Corp. 2013, 2025
// SPDX-License-Identifier: MPL-2.0
package common
import (
"context"
"fmt"
"os"
"runtime"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/aws/aws-sdk-go/service/ec2/ec2iface"
"github.com/hashicorp/packer-plugin-sdk/communicator"
"github.com/hashicorp/packer-plugin-sdk/multistep"
packersdk "github.com/hashicorp/packer-plugin-sdk/packer"
"github.com/hashicorp/packer-plugin-sdk/retry"
"github.com/hashicorp/packer-plugin-sdk/template/interpolate"
)
type StepKeyPair struct {
Debug bool
Comm *communicator.Config
DebugKeyPath string
IsRestricted bool
Ctx interpolate.Context
Tags map[string]string
doCleanup bool
}
func (s *StepKeyPair) Run(ctx context.Context, state multistep.StateBag) multistep.StepAction {
ui := state.Get("ui").(packersdk.Ui)
if s.Comm.SSHPrivateKeyFile != "" {
ui.Say("Using existing SSH private key")
privateKeyBytes, err := s.Comm.ReadSSHPrivateKeyFile()
if err != nil {
state.Put("error", err)
return multistep.ActionHalt
}
s.Comm.SSHPrivateKey = privateKeyBytes
return multistep.ActionContinue
}
if s.Comm.SSHAgentAuth && s.Comm.SSHKeyPairName == "" {
ui.Say("Using SSH Agent with key pair in Source AMI")
return multistep.ActionContinue
}
if s.Comm.SSHAgentAuth && s.Comm.SSHKeyPairName != "" {
ui.Say(fmt.Sprintf("Using SSH Agent for existing key pair %s", s.Comm.SSHKeyPairName))
return multistep.ActionContinue
}
if s.Comm.SSHTemporaryKeyPairName == "" {
ui.Say("Not using temporary keypair")
s.Comm.SSHKeyPairName = ""
return multistep.ActionContinue
}
ec2conn := state.Get("ec2").(ec2iface.EC2API)
var keyResp *ec2.CreateKeyPairOutput
ui.Say(fmt.Sprintf("Creating temporary keypair: %s", s.Comm.SSHTemporaryKeyPairName))
keypair := &ec2.CreateKeyPairInput{
KeyName: &s.Comm.SSHTemporaryKeyPairName,
KeyType: &s.Comm.SSHTemporaryKeyPairType,
}
if !s.IsRestricted {
region := state.Get("region").(*string)
ec2Tags, err := TagMap(s.Tags).EC2Tags(s.Ctx, aws.StringValue(region), state)
if err != nil {
err := fmt.Errorf("Error tagging key pair: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
keypair.TagSpecifications = ec2Tags.TagSpecifications(ec2.ResourceTypeKeyPair)
}
err := retry.Config{
Tries: 11,
RetryDelay: (&retry.Backoff{InitialBackoff: 200 * time.Millisecond, MaxBackoff: 30 * time.Second, Multiplier: 2}).Linear,
}.Run(ctx, func(ctx context.Context) error {
var err error
keyResp, err = ec2conn.CreateKeyPair(keypair)
return err
})
if err != nil {
state.Put("error", fmt.Errorf("Error creating temporary keypair: %s", err))
return multistep.ActionHalt
}
s.doCleanup = true
// Set some data for use in future steps
s.Comm.SSHKeyPairName = s.Comm.SSHTemporaryKeyPairName
s.Comm.SSHPrivateKey = []byte(*keyResp.KeyMaterial)
// If we're in debug mode, output the private key to the working
// directory.
if s.Debug {
ui.Message(fmt.Sprintf("Saving key for debug purposes: %s", s.DebugKeyPath))
f, err := os.Create(s.DebugKeyPath)
if err != nil {
state.Put("error", fmt.Errorf("Error saving debug key: %s", err))
return multistep.ActionHalt
}
defer f.Close()
// Write the key out
if _, err := f.Write([]byte(*keyResp.KeyMaterial)); err != nil {
state.Put("error", fmt.Errorf("Error saving debug key: %s", err))
return multistep.ActionHalt
}
// Chmod it so that it is SSH ready
if runtime.GOOS != "windows" {
if err := f.Chmod(0600); err != nil {
state.Put("error", fmt.Errorf("Error setting permissions of debug key: %s", err))
return multistep.ActionHalt
}
}
}
return multistep.ActionContinue
}
func (s *StepKeyPair) Cleanup(state multistep.StateBag) {
if !s.doCleanup {
return
}
ec2conn := state.Get("ec2").(*ec2.EC2)
ui := state.Get("ui").(packersdk.Ui)
// Remove the keypair
ui.Say("Deleting temporary keypair...")
_, err := ec2conn.DeleteKeyPair(&ec2.DeleteKeyPairInput{KeyName: &s.Comm.SSHTemporaryKeyPairName})
if err != nil {
ui.Error(fmt.Sprintf(
"Error cleaning up keypair. Please delete the key manually: %s", s.Comm.SSHTemporaryKeyPairName))
}
// Also remove the physical key if we're debugging.
if s.Debug {
if err := os.Remove(s.DebugKeyPath); err != nil {
ui.Error(fmt.Sprintf(
"Error removing debug key '%s': %s", s.DebugKeyPath, err))
}
}
}