gnu-social/plugins/ActivityPub/Entity/ActivitypubRsa.php

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<?php
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declare(strict_types = 1);
// {{{ License
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// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GNU social 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
// }}}
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/**
* ActivityPub implementation for GNU social
*
* @package GNUsocial
* @category ActivityPub
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*
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* @author Diogo Peralta Cordeiro <@diogo.site>
* @copyright 2018-2019, 2021 Free Software Foundation, Inc http://www.fsf.org
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
namespace Plugin\ActivityPub\Entity;
use App\Core\DB;
use App\Core\Entity;
use App\Core\Log;
use App\Entity\Actor;
use App\Util\Exception\ServerException;
use DateTimeInterface;
use Exception;
use Plugin\ActivityPub\Util\Explorer;
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/**
* ActivityPub Keys System
*
* @copyright 2018-2019, 2021 Free Software Foundation, Inc http://www.fsf.org
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* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
class ActivitypubRsa extends Entity
{
// {{{ Autocode
// @codeCoverageIgnoreStart
private int $actor_id;
private ?string $private_key = null;
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private string $public_key;
private DateTimeInterface $created;
private DateTimeInterface $modified;
public function setActorId(int $actor_id): self
{
$this->actor_id = $actor_id;
return $this;
}
public function getActorId(): int
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{
return $this->actor_id;
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}
public function setPrivateKey(?string $private_key): self
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{
$this->private_key = $private_key;
return $this;
}
public function getPrivateKey(): ?string
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{
return $this->private_key;
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}
public function setPublicKey(string $public_key): self
{
$this->public_key = $public_key;
return $this;
}
public function getPublicKey(): string
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{
return $this->public_key;
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}
public function setCreated(DateTimeInterface $created): self
{
$this->created = $created;
return $this;
}
public function getCreated(): DateTimeInterface
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{
return $this->created;
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}
public function setModified(DateTimeInterface $modified): self
{
$this->modified = $modified;
return $this;
}
public function getModified(): DateTimeInterface
{
return $this->modified;
}
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// @codeCoverageIgnoreEnd
// }}} Autocode
/**
* Return table definition for Schema setup and Entity usage.
*
* @return array array of column definitions
*/
public static function schemaDef(): array
{
return [
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'name' => 'activitypub_rsa',
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'fields' => [
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'actor_id' => ['type' => 'int', 'not null' => true],
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'private_key' => ['type' => 'text'],
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'public_key' => ['type' => 'text', 'not null' => true],
'created' => ['type' => 'datetime', 'not null' => true, 'default' => 'CURRENT_TIMESTAMP', 'description' => 'date this record was created'],
'modified' => ['type' => 'timestamp', 'not null' => true, 'default' => 'CURRENT_TIMESTAMP', 'description' => 'date this record was modified'],
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],
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'primary key' => ['actor_id'],
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'foreign keys' => [
'activitypub_rsa_actor_id_fkey' => ['actor', ['actor_id' => 'id']],
],
];
}
/**
* Guarantees RSA keys for a given actor.
*
* @param bool $fetch =true Should attempt to fetch keys from a remote profile?
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*
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* @throws ServerException It should never occur, but if so, we break everything!
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*
* @return ActivitypubRsa The keys (private key is null for remote actors)
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*/
public static function getByActor(Actor $gsactor, bool $fetch = true): self
{
$apRSA = DB::findOneBy(self::class, ['actor_id' => ($actor_id = $gsactor->getId())], return_null: true);
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if (\is_null($apRSA)) {
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// Nonexistent key pair for this profile
if ($gsactor->getIsLocal()) {
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self::generateKeys($private_key, $public_key);
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$apRSA = self::create([
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'actor_id' => $actor_id,
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'private_key' => $private_key,
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'public_key' => $public_key,
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]);
DB::wrapInTransaction(fn () => DB::persist($apRSA));
} else {
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// ASSERT: This should never happen, but try to recover!
Log::error('Activitypub_rsa: It seems that the RSA key for this remote actor was somehow lost. That should have never happened!');
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if ($fetch) {
try {
$res = Explorer::getRemoteActorActivity($gsactor->getUri());
if (\is_null($res)) {
throw new ServerException('Activitypub_rsa: Failed to find keys for given profile. That should have not happened! Invalid remote actor (null response).');
}
DB::wrapInTransaction(fn () => DB::persist(self::create([
'actor_id' => $gsactor->getId(),
'public_key' => json_decode($res, associative: true)['publicKey']['publicKeyPem'],
])));
return self::getByActor($gsactor, false);
} catch (Exception $e) {
throw new ServerException('Activitypub_rsa: Failed to find keys for given profile. That should have not happened!', previous: $e);
}
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} else {
throw new ServerException('Activitypub_rsa: Failed to find keys for given profile. That should have not happened!');
}
}
}
return $apRSA;
}
/**
* Generates a pair of RSA keys.
*
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* @param null|string $private_key out
* @param null|string $public_key out
*
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* @author PHP Manual Contributed Notes <dirt@awoms.com>
*/
private static function generateKeys(?string &$private_key, ?string &$public_key): void
{
$config = [
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'digest_alg' => 'sha512',
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'private_key_bits' => 2048,
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'private_key_type' => \OPENSSL_KEYTYPE_RSA,
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];
// Create the private and public key
$res = openssl_pkey_new($config);
// Extract the private key from $res to $private_key
openssl_pkey_export($res, $private_key);
// Extract the public key from $res to $pubKey
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$pubKey = openssl_pkey_get_details($res);
$public_key = $pubKey['key'];
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unset($pubKey);
}
}