X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=plugins%2FDiaspora%2FDiasporaPlugin.php;h=c054d3b767658cfd32cd5629e428569bb402bb62;hb=4211206e3be06baa6c63af8c9fc819db3020d559;hp=66a9759f8787078d984914a803c29a9653c9ec74;hpb=d4fc064e4420d74dbff0587ba2b05d774e85a51b;p=quix0rs-gnu-social.git

diff --git a/plugins/Diaspora/DiasporaPlugin.php b/plugins/Diaspora/DiasporaPlugin.php
index 66a9759f87..c054d3b767 100644
--- a/plugins/Diaspora/DiasporaPlugin.php
+++ b/plugins/Diaspora/DiasporaPlugin.php
@@ -30,6 +30,9 @@ if (!defined('GNUSOCIAL')) { exit(1); }
  * @maintainer Mikael Nordfeldth <mmn@hethane.se>
  */
 
+// Depends on OStatus of course.
+addPlugin('OStatus');
+
 class DiasporaPlugin extends Plugin
 {
     const REL_SEED_LOCATION = 'http://joindiaspora.com/seed_location';
@@ -40,7 +43,7 @@ class DiasporaPlugin extends Plugin
     {
         // So far we've only handled RSA keys, but it can change in the future,
         // so be prepared. And remember to change the statically assigned type attribute below!
-        assert($magicsig->publicKey instanceof Crypt_RSA);
+        assert($magicsig->publicKey instanceof \phpseclib\Crypt\RSA);
         $xrd->links[] = new XML_XRD_Element_Link(self::REL_PUBLIC_KEY,
                                     base64_encode($magicsig->exportPublicKey()), 'RSA');
 
@@ -50,10 +53,33 @@ class DiasporaPlugin extends Plugin
                                     strtolower($magicsig->toFingerprint()));
     }
 
+    public function onMagicsigPublicKeyFromXRD(XML_XRD $xrd, &$pubkey)
+    {
+        // See if we have a Diaspora public key in the XRD response
+        $link = $xrd->get(self::REL_PUBLIC_KEY, 'RSA');
+        if (!is_null($link)) {
+            // If we do, decode it so we have the PKCS1 format (starts with -----BEGIN PUBLIC KEY-----)
+            $pkcs1 = base64_decode($link->href);
+            $magicsig = new Magicsig(Magicsig::DEFAULT_SIGALG); // Diaspora uses RSA-SHA256 (we do too)
+            try {
+                // Try to load the public key so we can get it in the standard Magic signature format
+                $magicsig->loadPublicKeyPKCS1($pkcs1);
+                // We found it and will now store it in $pubkey in a proper format!
+                // This is how it would be found in a well implemented XRD according to the standard.
+                $pubkey = 'data:application/magic-public-key,'.$magicsig->toString();
+                common_debug('magic-public-key found in diaspora-public-key: '.$pubkey);
+                return false;
+            } catch (ServerException $e) {
+                common_log(LOG_WARNING, $e->getMessage());
+            }
+        }
+        return true;
+    }
+
     public function onPluginVersion(array &$versions)
     {
         $versions[] = array('name' => 'Diaspora',
-                            'version' => '0.1',
+                            'version' => '0.2',
                             'author' => 'Mikael Nordfeldth',
                             'homepage' => 'https://gnu.io/social',
                             // TRANS: Plugin description.
@@ -62,4 +88,174 @@ class DiasporaPlugin extends Plugin
 
         return true;
     }
+
+    public function onStartMagicEnvelopeToXML(MagicEnvelope $magic_env, XMLStringer $xs, $flavour=null, Profile $target=null)
+    {
+        // Since Diaspora doesn't use a separate namespace for their "extended"
+        // salmon slap, we'll have to resort to this workaround hack.
+        if ($flavour !== 'diaspora') {
+            return true;
+        }
+
+        // WARNING: This changes the $magic_env contents! Be aware of it.
+
+        /**
+         * https://wiki.diasporafoundation.org/Federation_protocol_overview
+         * http://www.rubydoc.info/github/Raven24/diaspora-federation/master/DiasporaFederation/Salmon/EncryptedSlap
+         *
+         * Constructing the encryption header
+         */
+
+        // For some reason diaspora wants the salmon slap in a <diaspora> header.
+        $xs->elementStart('diaspora', array('xmlns'=>'https://joindiaspora.com/protocol'));
+
+        /**
+         * Choose an AES key and initialization vector, suitable for the
+         * aes-256-cbc cipher. I shall refer to this as the “inner key”
+         * and the “inner initialization vector (iv)”.
+         */
+        $inner_key = new \phpseclib\Crypt\AES(\phpseclib\Crypt\AES::MODE_CBC);
+        $inner_key->setKeyLength(256);  // set length to 256 bits (could be calculated, but let's be sure)
+        $inner_key->setKey(common_random_rawstr(32));   // 32 bytes from a (pseudo) random source
+        $inner_key->setIV(common_random_rawstr(16));    // 16 bytes is the block length
+
+        /**
+         * Construct the following XML snippet:
+         *  <decrypted_header>
+         *      <iv>((base64-encoded inner iv))</iv>
+         *      <aes_key>((base64-encoded inner key))</aes_key>
+         *      <author>
+         *          <name>Alice Exampleman</name>
+         *          <uri>acct:user@sender.example</uri>
+         *      </author>
+         *  </decrypted_header>
+         */
+        $decrypted_header = sprintf('<decrypted_header><iv>%1$s</iv><aes_key>%2$s</aes_key><author_id>%3$s</author_id></decrypted_header>',
+                                    base64_encode($inner_key->iv),
+                                    base64_encode($inner_key->key),
+                                    $magic_env->getActor()->getAcctUri());
+
+        /**
+         * Construct another AES key and initialization vector suitable
+         * for the aes-256-cbc cipher. I shall refer to this as the
+         * “outer key” and the “outer initialization vector (iv)”.
+         */
+        $outer_key = new \phpseclib\Crypt\AES(\phpseclib\Crypt\AES::MODE_CBC);
+        $outer_key->setKeyLength(256);  // set length to 256 bits (could be calculated, but let's be sure)
+        $outer_key->setKey(common_random_rawstr(32));   // 32 bytes from a (pseudo) random source
+        $outer_key->setIV(common_random_rawstr(16));    // 16 bytes is the block length
+
+        /**
+         * Encrypt your <decrypted_header> XML snippet using the “outer key”
+         * and “outer iv” (using the aes-256-cbc cipher). This encrypted
+         * blob shall be referred to as “the ciphertext”. 
+         */
+        $ciphertext = $outer_key->encrypt($decrypted_header, \phpseclib\Crypt\RSA::PADDING_PKCS1);
+
+        /**
+         * Construct the following JSON object, which shall be referred to
+         * as “the outer aes key bundle”:
+         *  {
+         *      "iv": ((base64-encoded AES outer iv)),
+         *      "key": ((base64-encoded AES outer key))
+         *  }
+         */
+        $outer_bundle = json_encode(array(
+                                'iv' => base64_encode($outer_key->iv),
+                                'key' => base64_encode($outer_key->key),
+                            ));
+        /**
+         * Encrypt the “outer aes key bundle” with Bob’s RSA public key.
+         * I shall refer to this as the “encrypted outer aes key bundle”.
+         */
+        common_debug('Diaspora creating "outer aes key bundle", will require magic-public-key');
+        $key_fetcher = new MagicEnvelope();
+        $remote_keys = $key_fetcher->getKeyPair($target, true); // actually just gets the public key
+        $enc_outer = $remote_keys->publicKey->encrypt($outer_bundle, \phpseclib\Crypt\RSA::PADDING_PKCS1);
+
+        /**
+         * Construct the following JSON object, which I shall refer to as
+         * the “encrypted header json object”:
+         *  {
+         *      "aes_key": ((base64-encoded encrypted outer aes key bundle)),
+         *      "ciphertext": ((base64-encoded ciphertextm from above))
+         *  }
+         */
+        $enc_header = json_encode(array(
+                            'aes_key' => base64_encode($enc_outer),
+                            'ciphertext' => base64_encode($ciphertext),
+                        ));
+
+        /**
+         * Construct the xml snippet:
+         *  <encrypted_header>((base64-encoded encrypted header json object))</encrypted_header>
+         */
+        $xs->element('encrypted_header', null, base64_encode($enc_header));
+
+        /**
+         * In order to prepare the payload message for inclusion in your
+         * salmon slap, you will:
+         *
+         * 1. Encrypt the payload message using the aes-256-cbc cipher and
+         *      the “inner encryption key” and “inner encryption iv” you
+         *      chose earlier.
+         * 2. Base64-encode the encrypted payload message.
+         */
+        $payload = $inner_key->encrypt($magic_env->getData(), \phpseclib\Crypt\RSA::PADDING_PKCS1);
+        //FIXME: This means we don't actually put an <atom:entry> in the payload,
+        // since Diaspora has its own update method! Silly me. Read up on:
+        // https://wiki.diasporafoundation.org/Federation_Message_Semantics
+        $magic_env->signMessage(base64_encode($payload), 'application/xml');
+
+
+        // Since we have to change the content of me:data we'll just write the
+        // whole thing from scratch. We _could_ otherwise have just manipulated
+        // that element and added the encrypted_header in the EndMagicEnvelopeToXML event.
+        $xs->elementStart('me:env', array('xmlns:me' => MagicEnvelope::NS));
+        $xs->element('me:data', array('type' => $magic_env->getDataType()), $magic_env->getData());
+        $xs->element('me:encoding', null, $magic_env->getEncoding());
+        $xs->element('me:alg', null, $magic_env->getSignatureAlgorithm());
+        $xs->element('me:sig', null, $magic_env->getSignature());
+        $xs->elementEnd('me:env');
+
+        $xs->elementEnd('entry');
+
+        return false;
+    }
+
+    public function onSalmonSlap($endpoint_uri, MagicEnvelope $magic_env, Profile $target=null)
+    {
+        try {
+            $envxml = $magic_env->toXML($target, 'diaspora');
+        } catch (Exception $e) {
+            common_log(LOG_ERR, sprintf('Could not generate Magic Envelope XML (diaspora flavour) for profile id=='.$target->getID().': '.$e->getMessage()));
+            return false;
+        }
+
+        // Diaspora wants another POST format (base64url-encoded POST variable 'xml')
+        $headers = array('Content-Type: application/x-www-form-urlencoded');
+
+        // Another way to distinguish Diaspora from GNU social is that a POST with
+        // $headers=array('Content-Type: application/magic-envelope+xml') would return
+        // HTTP status code 422 Unprocessable Entity, at least as of 2015-10-04.
+        try {
+            $client = new HTTPClient();
+            $client->setBody('xml=' . Magicsig::base64_url_encode($envxml));
+            $response = $client->post($endpoint_uri, $headers);
+        } catch (Exception $e) {
+            common_log(LOG_ERR, "Diaspora-flavoured Salmon post to $endpoint_uri failed: " . $e->getMessage());
+            return false;
+        }
+
+        // 200 OK is the best response
+        // 202 Accepted is what we get from Diaspora for example
+        if (!in_array($response->getStatus(), array(200, 202))) {
+            common_log(LOG_ERR, sprintf('Salmon (from profile %d) endpoint %s returned status %s: %s',
+                                $magic_env->getActor()->getID(), $endpoint_uri, $response->getStatus(), $response->getBody()));
+            return true;
+        }
+
+        // Success!
+        return false;
+    }
 }