packer-cn/common/step_cleanup_temp_keys.go

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package common
import (
"context"
"fmt"
"log"
"github.com/hashicorp/packer/helper/communicator"
"github.com/hashicorp/packer/helper/multistep"
"github.com/hashicorp/packer/packer"
)
type StepCleanupTempKeys struct {
Comm *communicator.Config
}
func (s *StepCleanupTempKeys) Run(ctx context.Context, state multistep.StateBag) multistep.StepAction {
// This step is mostly cosmetic; Packer deletes the ephemeral keys anyway
// so there's no realistic situation where these keys can cause issues.
// However, it's nice to clean up after yourself.
if !s.Comm.SSHClearAuthorizedKeys {
return multistep.ActionContinue
}
if s.Comm.Type != "ssh" {
return multistep.ActionContinue
}
if s.Comm.SSHTemporaryKeyPairName == "" {
return multistep.ActionContinue
}
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comm := state.Get("communicator").(packer.Communicator)
ui := state.Get("ui").(packer.Ui)
cmd := new(packer.RemoteCmd)
ui.Say("Trying to remove ephemeral keys from authorized_keys files")
// Per the OpenSSH manual (https://man.openbsd.org/sshd.8), a typical
// line in the 'authorized_keys' file contains several fields that
// are delimited by spaces. Here is an (abbreviated) example of a line:
// ssh-rsa AAAAB3Nza...LiPk== user@example.net
//
// In the above example, 'ssh-rsa' is the key pair type,
// 'AAAAB3Nza...LiPk==' is the base64 encoded public key,
// and 'user@example.net' is a comment (in this case, describing
// who the key belongs to).
//
// In the following 'sed' calls, the comment field will be equal to
// the value of communicator.Config.SSHTemporaryKeyPairName.
// We can remove an authorized public key using 'sed' by looking
// for a line ending in ' packer-key-pair-comment' (note the
// leading space).
//
// TODO: Why create a backup file if you are going to remove it?
cmd.Command = fmt.Sprintf("sed -i.bak '/ %s$/d' ~/.ssh/authorized_keys; rm ~/.ssh/authorized_keys.bak", s.Comm.SSHTemporaryKeyPairName)
if err := cmd.RunWithUi(ctx, comm, ui); err != nil {
log.Printf("Error cleaning up ~/.ssh/authorized_keys; please clean up keys manually: %s", err)
}
cmd = new(packer.RemoteCmd)
cmd.Command = fmt.Sprintf("sudo sed -i.bak '/ %s$/d' /root/.ssh/authorized_keys; sudo rm /root/.ssh/authorized_keys.bak", s.Comm.SSHTemporaryKeyPairName)
if err := cmd.RunWithUi(ctx, comm, ui); err != nil {
log.Printf("Error cleaning up /root/.ssh/authorized_keys; please clean up keys manually: %s", err)
}
return multistep.ActionContinue
}
func (s *StepCleanupTempKeys) Cleanup(state multistep.StateBag) {
}