+ /**
+ *
+ * Generate a key pair for all further communications with this person.
+ * We have a keypair for every contact, and a site key for unknown people.
+ * This provides a means to carry on relationships with other people if
+ * any single key is compromised. It is a robust key. We're much more
+ * worried about key leakage than anybody cracking it.
+ *
+ */
+
+ $res = openssl_pkey_new(array(
+ 'digest_alg' => 'sha1',
+ 'private_key_bits' => 4096,
+ 'encrypt_key' => false )
+ );
+
+ $private_key = '';
+
+ openssl_pkey_export($res, $private_key);
+
+ $pubkey = openssl_pkey_get_details($res);
+ $public_key = $pubkey["key"];
+
+ // Save the private key. Send them the public key.
+
+ $r = q("UPDATE `contact` SET `prvkey` = '%s' WHERE `id` = %d AND `uid` = %d LIMIT 1",
+ dbesc($private_key),
+ intval($contact_id),
+ intval($uid)
+ );
+
+ $params = array();
+
+ /**
+ *
+ * Per the DFRN protocol, we will verify both ends by encrypting the dfrn_id with our
+ * site private key (person on the other end can decrypt it with our site public key).
+ * Then encrypt our profile URL with the other person's site public key. They can decrypt
+ * it with their site private key. If the decryption on the other end fails for either
+ * item, it indicates tampering or key failure on at least one site and we will not be
+ * able to provide a secure communication pathway.
+ *
+ * If other site is willing to accept full encryption, (aes_allow is 1 AND we have php5.3
+ * or later) then we encrypt the personal public key we send them using AES-256-CBC and a
+ * random key which is encrypted with their site public key.
+ *
+ */
+
+ $src_aes_key = random_string();
+
+ $result = '';
+ openssl_private_encrypt($dfrn_id,$result,$user[0]['prvkey']);
+
+ $params['dfrn_id'] = bin2hex($result);
+ $params['public_key'] = $public_key;
+
+
+ $my_url = $a->get_baseurl() . '/profile/' . $user[0]['nickname'];
+
+ openssl_public_encrypt($my_url, $params['source_url'], $site_pubkey);
+ $params['source_url'] = bin2hex($params['source_url']);
+
+ if($aes_allow && function_exists('openssl_encrypt')) {
+ openssl_public_encrypt($src_aes_key, $params['aes_key'], $site_pubkey);
+ $params['aes_key'] = bin2hex($params['aes_key']);
+ $params['public_key'] = bin2hex(openssl_encrypt($public_key,'AES-256-CBC',$src_aes_key));
+ }
+
+ $params['dfrn_version'] = DFRN_PROTOCOL_VERSION ;
+ if($duplex == 1)
+ $params['duplex'] = 1;
+
+ logger('dfrn_confirm: Confirm: posting data to ' . $dfrn_confirm . ': ' . print_r($params,true), LOGGER_DATA);
+
+ /**
+ *
+ * POST all this stuff to the other site.
+ * Temporarily raise the network timeout to 120 seconds because the default 60
+ * doesn't always give the other side quite enough time to decrypt everything.
+ *
+ */
+
+ $a->config['system']['curl_timeout'] = 120;
+
+ $res = post_url($dfrn_confirm,$params);
+
+ logger('dfrn_confirm: Confirm: received data: ' . $res, LOGGER_DATA);
+
+ // Now figure out what they responded. Try to be robust if the remote site is
+ // having difficulty and throwing up errors of some kind.
+
+ $leading_junk = substr($res,0,strpos($res,'<?xml'));
+
+ $res = substr($res,strpos($res,'<?xml'));
+ if(! strlen($res)) {
+
+ // No XML at all, this exchange is messed up really bad.
+ // We shouldn't proceed, because the xml parser might choke,
+ // and $status is going to be zero, which indicates success.
+ // We can hardly call this a success.
+
+ notice( t('Response from remote site was not understood.') . EOL);
+ return;
+ }
+
+ if(strlen($leading_junk) && get_config('system','debugging')) {
+
+ // This might be more common. Mixed error text and some XML.
+ // If we're configured for debugging, show the text. Proceed in either case.
+
+ notice( t('Unexpected response from remote site: ') . EOL . $leading_junk . EOL );
+ }
+
+ $xml = simplexml_load_string($res);
+ $status = (int) $xml->status;
+ $message = unxmlify($xml->message); // human readable text of what may have gone wrong.
+ switch($status) {
+ case 0:
+ notice( t("Confirmation completed successfully.") . EOL);
+ if(strlen($message))
+ notice( t('Remote site reported: ') . $message . EOL);
+ break;
+ case 1:
+ // birthday paradox - generate new dfrn-id and fall through.
+ $new_dfrn_id = random_string();
+ $r = q("UPDATE contact SET `issued-id` = '%s' WHERE `id` = %d AND `uid` = %d LIMIT 1",
+ dbesc($new_dfrn_id),
+ intval($contact_id),
+ intval($uid)
+ );
+
+ case 2:
+ notice( t("Temporary failure. Please wait and try again.") . EOL);
+ if(strlen($message))
+ notice( t('Remote site reported: ') . $message . EOL);
+ break;
+
+
+ case 3:
+ notice( t("Introduction failed or was revoked.") . EOL);
+ if(strlen($message))
+ notice( t('Remote site reported: ') . $message . EOL);
+ break;
+ }
+
+ if(($status == 0) && ($intro_id)) {
+
+ // Success. Delete the notification.
+
+ $r = q("DELETE FROM `intro` WHERE `id` = %d AND `uid` = %d LIMIT 1",
+ intval($intro_id),
+ intval($uid)
+ );
+
+ }
+
+ if($status != 0)
+ return;
+ }
+
+
+ /*
+ *
+ * We have now established a relationship with the other site.
+ * Let's make our own personal copy of their profile photo so we don't have
+ * to always load it from their site.
+ *
+ * We will also update the contact record with the nature and scope of the relationship.
+ *
+ */
+
+ require_once("Photo.php");
+
+ $photos = import_profile_photo($contact['photo'],$uid,$contact_id);
+
+ logger('dfrn_confirm: confirm - imported photos');
+
+ if($network === 'dfrn') {
+
+ $new_relation = REL_VIP;
+ if(($relation == REL_FAN) || ($duplex))
+ $new_relation = REL_BUD;
+
+ if(($relation == REL_FAN) && ($duplex))
+ $duplex = 0;
+
+ $r = q("UPDATE `contact` SET `photo` = '%s',
+ `thumb` = '%s',
+ `micro` = '%s',
+ `rel` = %d,
+ `name-date` = '%s',
+ `uri-date` = '%s',
+ `avatar-date` = '%s',
+ `blocked` = 0,
+ `pending` = 0,
+ `duplex` = %d,
+ `network` = 'dfrn' WHERE `id` = %d LIMIT 1
+ ",
+ dbesc($photos[0]),
+ dbesc($photos[1]),
+ dbesc($photos[2]),
+ intval($new_relation),
+ dbesc(datetime_convert()),
+ dbesc(datetime_convert()),
+ dbesc(datetime_convert()),
+ intval($duplex),
+ intval($contact_id)
+ );
+ }
+ else {
+ // $network !== 'dfrn'
+
+ $notify = '';
+ $poll = '';
+
+ $arr = lrdd($contact['url']);
+ if(count($arr)) {
+ foreach($arr as $link) {
+ if($link['@attributes']['rel'] === 'salmon')
+ $notify = $link['@attributes']['href'];
+ if($link['@attributes']['rel'] === NAMESPACE_FEED)
+ $poll = $link['@attributes']['href'];
+ }
+ }
+
+ $r = q("DELETE FROM `intro` WHERE `id` = %d AND `uid` = %d LIMIT 1",
+ intval($intro_id),
+ intval($uid)
+ );
+
+
+ $r = q("UPDATE `contact` SET `photo` = '%s',
+ `thumb` = '%s',
+ `micro` = '%s',
+ `name-date` = '%s',
+ `uri-date` = '%s',
+ `avatar-date` = '%s',
+ `notify` = '%s',
+ `poll` = '%s',
+ `blocked` = 0,
+ `pending` = 0,
+ `network` = 'stat'
+ WHERE `id` = %d LIMIT 1
+ ",
+ dbesc($photos[0]),
+ dbesc($photos[1]),
+ dbesc($photos[2]),
+ dbesc(datetime_convert()),
+ dbesc(datetime_convert()),
+ dbesc(datetime_convert()),
+ dbesc($notify),
+ dbesc($poll),
+ intval($contact_id)
+ );
+ }
+
+ if($r === false)
+ notice( t('Unable to set contact photo.') . EOL);
+
+ // reload contact info
+
+ $r = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
+ intval($contact_id)
+ );
+ if(count($r))
+ $contact = $r[0];
+ else
+ $contact = null;
+
+ // Send a new friend post if we are allowed to...
+
+ $r = q("SELECT `hide-friends` FROM `profile` WHERE `uid` = %d AND `is-default` = 1 LIMIT 1",
+ intval($uid)
+ );
+ if((count($r)) && ($r[0]['hide-friends'] == 0) && (is_array($contact)) && isset($new_relation) && ($new_relation == REL_BUD)) {
+
+ require_once('include/items.php');
+
+ $self = q("SELECT * FROM `contact` WHERE `self` = 1 AND `uid` = %d LIMIT 1",
+ intval($uid)
+ );
+
+ if(count($self)) {
+
+ $arr = array();
+ $arr['uri'] = $arr['parent-uri'] = item_new_uri($a->get_hostname(), $uid);
+ $arr['uid'] = $uid;
+ $arr['contact-id'] = $self[0]['id'];
+ $arr['wall'] = 1;
+ $arr['type'] = 'wall';
+ $arr['gravity'] = 0;
+ $arr['author-name'] = $arr['owner-name'] = $self[0]['name'];
+ $arr['author-link'] = $arr['owner-link'] = $self[0]['url'];
+ $arr['author-avatar'] = $arr['owner-avatar'] = $self[0]['thumb'];
+ $arr['verb'] = ACTIVITY_FRIEND;
+ $arr['object-type'] = ACTIVITY_OBJ_PERSON;
+ $arr['body'] = '[url=' . $self[0]['url'] . ']' . $self[0]['name'] . '[/url] ' . t('is now friends with')
+ . ' [url=' . $contact['url'] . ']' . $contact['name'] . '[/url]' . "\n\n\n"
+ . ' [url=' . $contact['url'] . ']' . '[img]' . $contact['thumb'] . '[/img][/url]';
+
+ $arr['object'] = '<object><type>' . ACTIVITY_OBJ_PERSON . '</type><title>' . $contact['name'] . '</title>'
+ . '<id>' . $contact['url'] . '/' . $contact['name'] . '</id>';
+ $arr['object'] .= '<link>' . xmlify('<link rel="alternate" type="text/html" href="' . $contact['url'] . '" />' . "\n");
+ $arr['object'] .= xmlify('<link rel="photo" type="image/jpeg" href="' . $contact['thumb'] . '" />' . "\n");
+ $arr['object'] .= '</link></object>' . "\n";
+ $arr['last-child'] = 1;
+
+ $i = item_store($arr);
+ if($i)
+ proc_run('php',"include/notifier.php","activity","$i");
+
+ }
+
+ }
+ // Let's send our user to the contact editor in case they want to
+ // do anything special with this new friend.
+
+ if($handsfree === null)
+ goaway($a->get_baseurl() . '/contacts/' . intval($contact_id));
+ else
+ return;
+ //NOTREACHED
+ }
+
+ /**
+ *
+ *
+ * End of Scenario 1. [Local confirmation of remote friend request].
+ *
+ * Begin Scenario 2. This is the remote response to the above scenario.
+ * This will take place on the site that originally initiated the friend request.
+ * In the section above where the confirming party makes a POST and
+ * retrieves xml status information, they are communicating with the following code.
+ *
+ */