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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2020 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package ctlcmd
import (
"encoding/json"
"fmt"
"github.com/snapcore/snapd/i18n"
"github.com/snapcore/snapd/kernel/fde"
)
type fdeSetupRequestCommand struct {
baseCommand
}
var shortFdeSetupRequestHelp = i18n.G("Obtain full disk encryption setup request")
var longFdeSetupRequestHelp = i18n.G(`
The fde-setup-request command is used inside the fde-setup hook. It will
return information about what operation for full-disk encryption is
requested and auxiliary data to complete this operation.
The fde-setup hook should do what is requested and then call
"snapctl fde-setup-result" and pass the result data to stdin.
Here is an example for how the fde-setup hook is called initially:
$ snapctl fde-setup-request
{"op":"features"}
$ echo '{"features": []}' | snapctl fde-setup-result
Alternatively the hook could reply with:
$ echo '{"error":"hardware-unsupported"}' | snapctl fde-setup-result
And then it is called again with a request to do the initial key setup:
$ snapctl fde-setup-request
{"op":"initial-setup", "key": "key-to-seal"}
$ echo "{\"sealed-key\":\"$base64_encoded_sealed_key\"}" | snapctl fde-setup-result
`)
func init() {
addCommand("fde-setup-request", shortFdeSetupRequestHelp, longFdeSetupRequestHelp, func() command { return &fdeSetupRequestCommand{} })
}
func (c *fdeSetupRequestCommand) Execute(args []string) error {
context, err := c.ensureContext()
if err != nil {
return err
}
context.Lock()
defer context.Unlock()
if context.HookName() != "fde-setup" {
return fmt.Errorf("cannot use fde-setup-request outside of the fde-setup hook")
}
var fdeSetup fde.SetupRequest
if err := context.Get("fde-setup-request", &fdeSetup); err != nil {
return fmt.Errorf("cannot get fde-setup-op from context: %v", err)
}
// Op is either "initial-setup" or "features"
switch fdeSetup.Op {
case "features", "initial-setup":
// fine
default:
return fmt.Errorf("unknown fde-setup-request op %q", fdeSetup.Op)
}
bytes, err := json.Marshal(fdeSetup)
if err != nil {
return fmt.Errorf("cannot json print fde key: %v", err)
}
c.printf("%s\n", string(bytes))
return nil
}
type fdeSetupResultCommand struct {
baseCommand
}
var shortFdeSetupResultHelp = i18n.G("Set result for full disk encryption")
var longFdeSetupResultHelp = i18n.G(`
The fde-setup-result command sets the result data for a fde-setup hook
reading it from stdin.
For example:
When the fde-setup hook is called with "op":"features:
$ echo '{"features": []}' | snapctl fde-setup-result
When the fde-setup hook is called with "op":"initial-setup":
$ echo "{\"sealed-key\":\"$base64_encoded_sealed_key\"}" | snapctl fde-setup-result
`)
func init() {
addCommand("fde-setup-result", shortFdeSetupResultHelp, longFdeSetupResultHelp, func() command { return &fdeSetupResultCommand{} })
}
func (c *fdeSetupResultCommand) Execute(args []string) error {
context, err := c.ensureContext()
if err != nil {
return err
}
context.Lock()
defer context.Unlock()
if context.HookName() != "fde-setup" {
return fmt.Errorf("cannot use fde-setup-result outside of the fde-setup hook")
}
var fdeSetupResult []byte
if err := context.Get("stdin", &fdeSetupResult); err != nil {
return fmt.Errorf("internal error: cannot get result from stdin: %v", err)
}
if fdeSetupResult == nil {
return fmt.Errorf("no result data found from stdin")
}
context.Set("fde-setup-result", fdeSetupResult)
return nil
}
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