/
nerves_hub.key.ex
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/
nerves_hub.key.ex
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defmodule Mix.Tasks.NervesHub.Key do
use Mix.Task
import Mix.NervesHubCLI.Utils
alias Mix.NervesHubCLI.Shell
@shortdoc "Manages firmware signing keys"
@moduledoc """
Manages firmware signing keys
Firmware signing keys consist of public and private keys. The `mix
nerves_hub.key` task manages both pieces for you. Private signing keys are
password-protected and are NEVER sent to NervesHub or any other server.
Public keys, however, are registered with NervesHub and embedded in your
firmware.
Signing keys are stored in `~/.nerves-hub/keys`. Keys may be shared between
developers by copying the files in this folder.
NervesHub can manage more than one key so that you can have different
development and production keys in use. For example, production devices
deployed with only the production public key will not accept firmware signed
by development keys.
To ensure that firmware includes keys registered with NervesHub, add the
following entry in your project's `config.exs`:
# List the public firmware signing keys to include on the device
config :nerves_hub,
public_keys: [:my_dev_key, :my_prod_key]
## list
List the keys known to NervesHub
mix nerves_hub.key list
### Command-line options
* `--local` - (Optional) Do not request key information from NervesHub
## create
Create a new firmware signing key pair with the specified name and register
the public key with NervesHub
mix nerves_hub.key create NAME
### Command-line options
* `--local` - (Optional) Do not register the public key with NervesHub
## delete
Delete a signing key locally and on NervesHub
mix nerves_hub.key delete NAME
### Command-line options
* `--local` - (Optional) Perform the operation only locally defaults to
`false` which will perform both local and remote operations
## import
Import an existing key locally and on NervesHub
mix nerves_hub.key import NAME PUBLIC_KEY_FILE PRIVATE_KEY_FILE
### Command-line options
* `--local` - (Optional) Do not register the public key with NervesHub
## export
Export a signing key to a tar.gz archive.
mix nerves_hub.key export NAME
### Command-line options
* `--path` - (Optional) A local location for exporting keys.
"""
@switches [
org: :string,
path: :string,
local: :boolean
]
def run(args) do
# compile the project in case we need CA certs from it
_ = Mix.Task.run("compile")
_ = Application.ensure_all_started(:nerves_hub_cli)
{opts, args} = OptionParser.parse!(args, strict: @switches)
show_api_endpoint()
org = org(opts)
case args do
["list"] ->
list(org, opts)
["create", name] ->
create(name, org, opts)
["delete", name] ->
delete(name, org, opts)
["import", name, public_key_file, private_key_file] ->
import(name, org, public_key_file, private_key_file, opts)
["export", name] ->
export(name, org, opts)
_ ->
render_help()
end
end
@spec render_help() :: no_return()
def render_help() do
Shell.raise("""
Invalid arguments to `mix nerves_hub.key`.
Usage:
mix nerves_hub.key list
mix nerves_hub.key create NAME
mix nerves_hub.key delete NAME
mix nerves_hub.key import NAME PUBLIC_KEY_FILE PRIVATE_KEY_FILE
mix nerves_hub.key export NAME
Run `mix help nerves_hub.key` for more information.
""")
end
def list(org, opts) do
if Keyword.get(opts, :local, false) do
list_local(org)
else
list_remote(org)
end
end
def list_local(org) do
NervesHubCLI.Key.local_keys(org)
|> Enum.map(&stringify/1)
|> render_keys()
end
def list_remote(org) do
auth = Shell.request_auth()
case NervesHubCLI.API.Key.list(org, auth) do
{:ok, %{"data" => keys}} ->
render_keys(keys)
error ->
Shell.info("Failed to list signing keys \nreason: #{inspect(error)}")
end
end
def create(name, org, opts) do
if NervesHubCLI.Key.exists?(org, name) do
Shell.raise("""
The key '#{name}' already exists.
Please choose a different name or delete by
running `mix nerves_hub.key delete #{name} [--local]`
""")
else
if Keyword.get(opts, :local, false) do
with {:ok, key} <- create_local(name, org) do
Shell.info("\nSuccess. Key information:")
render_key(%{"name" => name, "key" => key})
else
error ->
Shell.render_error(error)
end
else
with {:ok, key} <- create_local(name, org),
{:ok, %{"data" => key}} <- create_remote(name, key, org) do
Shell.info("\nSuccess. Key information:")
render_key(key)
else
error ->
Shell.render_error(error)
end
end
end
end
def delete(name, org, opts) do
if Shell.yes?("Delete signing key '#{name}'?") do
if Keyword.get(opts, :local, false) do
delete_local(name, org)
else
with {:ok, ""} <- delete_remote(name, org),
:ok <- delete_local(name, org) do
:ok
else
error ->
Shell.render_error(error)
end
end
end
end
def import(name, org, public_key_file, private_key_file, opts) do
if NervesHubCLI.Key.exists?(org, name) do
Shell.raise("The key #{name} already exists, aborting")
else
if Keyword.get(opts, :local, false) do
with {:ok, key} <- import_local(name, org, public_key_file, private_key_file) do
Shell.info("\nSuccess. Key information:")
render_key(%{"name" => name, "key" => key})
else
error ->
Shell.render_error(error)
end
else
with {:ok, key} <- import_local(name, org, public_key_file, private_key_file),
{:ok, %{"data" => key}} <- create_remote(name, key, org) do
Shell.info("\nSuccess. Key information:")
render_key(key)
else
error ->
Shell.render_error(error)
end
end
end
end
def export(key, org, opts) do
path = opts[:path] || NervesHubCLI.home_dir()
with :ok <- File.mkdir_p(path),
{:ok, public_key, private_key} <- Shell.request_keys(org, key),
filename <- key_tar_file_name(path, org, key),
{:ok, tar} <- :erl_tar.open(to_charlist(filename), [:write, :compressed]),
:ok <- :erl_tar.add(tar, {~c"#{key}.pub", public_key}, []),
:ok <- :erl_tar.add(tar, {~c"#{key}.priv", private_key}, []),
:ok <- :erl_tar.close(tar) do
Shell.info("Fwup keys exported to: #{filename}")
else
error -> Shell.render_error(error)
end
end
def delete_remote(name, org) do
auth = Shell.request_auth()
Shell.info("Deleting signing key '#{name}' from NervesHub")
NervesHubCLI.API.Key.delete(org, name, auth)
end
# TODO handle file not found
def delete_local(name, org) do
Shell.info("Deleting signing key '#{name}' locally")
NervesHubCLI.Key.delete(org, name)
end
defp create_local(name, org) do
Shell.info("Creating a firmware signing key pair named '#{name}'.")
Shell.info("")
Shell.info("The private key is stored locally and must be protected by a password.")
Shell.info("If you are sharing the firmware signing private key with others,")
Shell.info("please choose an appropriate password.")
Shell.info("")
key_password = Shell.password_get("Signing key password for '#{name}':")
with {:ok, public_key_file, private_key_file} =
NervesHubCLI.Key.create(org, name, key_password),
{:ok, public_key} <- File.read(public_key_file) do
Shell.info("")
Shell.info("Firmware public key written to '#{public_key_file}'.")
Shell.info("Password-protected firmware private key written to '#{private_key_file}'.")
{:ok, public_key}
end
end
defp create_remote(name, key, org) do
Shell.info("\nRegistering the firmware signing public key '#{name}' with NervesHub.")
auth = Shell.request_auth()
NervesHubCLI.API.Key.create(org, name, key, auth)
end
defp import_local(name, org, public_key_file, private_key_file) do
Shell.info("\nPlease enter a password to protect the firmware signing private key.")
key_password = Shell.password_get("Signing key password for '#{name}':")
with {:ok, public_key_file, _private_key_file} =
NervesHubCLI.Key.import(org, name, key_password, public_key_file, private_key_file),
{:ok, public_key} <- File.read(public_key_file) do
{:ok, public_key}
end
end
defp render_keys([]) do
Shell.info("No firmware signing keys have been created.")
end
defp render_keys(keys) when is_list(keys) do
Shell.info("\nFirmware signing keys:")
Enum.each(keys, fn params ->
Shell.info("------------")
render_key(params)
end)
Shell.info("------------")
Shell.info("")
end
defp render_key(params) do
Shell.info(" name: #{params["name"]}")
Shell.info(" public key: #{params["key"]}")
end
defp key_tar_file_name(path, org, key),
do: Path.join(path, "nerves_hub-fwup-keys-#{org}-#{key}.tar.gz")
end