<?php
+// There are two possible entry points.
+function dfrn_confirm_post(&$a,$handsfree = null) {
-function dfrn_confirm_post(&$a) {
+ if(is_array($handsfree)) {
- if($a->argc > 1)
- $node = $a->argv[1];
+ // called directly from dfrn_request due to automatic friend acceptance
+ // any $_POST parameters we may require are supplied in the $handsfree array
+
+ $node = $handsfree['node'];
+ $a->interactive = false; // notice() becomes a no-op since nobody is there to see it
+
+ }
+ else {
+ if($a->argc > 1)
+ $node = $a->argv[1];
+ }
+
+ // Main entry point. Our user received a friend request notification (perhaps
+ // from another site) and clicked 'Approve'. $POST['source_url'] is not set.
+ // OR we have been called directly from dfrn_request ($handsfree != null) due to
+ // this being a page type which supports automatic friend acceptance.
+
+ if(! x($_POST,'source_url')) {
+
+ $uid = ((is_array($handsfree)) ? $handsfree['uid'] : local_user());
+
+ if(! $uid) {
+ notice( t('Permission denied.') . EOL );
+ return;
+ }
+
+ $user = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1",
+ intval($uid)
+ );
+
+ if(! $user) {
+ notice( t('Profile not found.') . EOL );
+ return;
+ }
+
+
+ // These come from either the friend request notification form or $handsfree array.
+
+ if(is_array($handsfree)) {
+ $dfrn_id = $handsfree['dfrn_id'];
+ $intro_id = $handsfree['intro_id'];
+ $duplex = $handsfree['duplex'];
+ }
+ else {
+ $dfrn_id = ((x($_POST,'dfrn_id')) ? notags(trim($_POST['dfrn_id'])) : "");
+ $intro_id = intval($_POST['intro_id']);
+ $duplex = intval($_POST['duplex']);
+ $cid = intval($_POST['contact_id']);
+ }
+
+ // The other person will have been issued an ID when they first requested friendship.
+ // Locate their record. At this time, their record will have both pending and blocked set to 1.
+ // There won't be any dfrn_id if this is a network follower, so use the contact_id instead.
+
+ $r = q("SELECT * FROM `contact` WHERE ( ( `issued-id` != '' AND `issued-id` = '%s' ) OR ( `id` = %d AND `id` != 0 ) ) AND `uid` = %d LIMIT 1",
+ dbesc($dfrn_id),
+ intval($cid),
+ intval($uid)
+ );
+
+ if(! count($r)) {
+ notice( t('Contact not found.') . EOL );
+ return;
+ }
+
+ $contact = $r[0];
+
+ $contact_id = $contact['id'];
+ $relation = $contact['rel'];
+ $site_pubkey = $contact['site-pubkey'];
+ $dfrn_confirm = $contact['confirm'];
+ $aes_allow = $contact['aes_allow'];
+
+
+ if($contact['network'] === 'dfrn') {
+
+ // 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' => 'whirlpool',
+ '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 protocol document, 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;
+
+ // POST all this stuff to the other site.
+
+ $res = post_url($dfrn_confirm,$params);
+
+ // 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.
+
+ require_once("Photo.php");
+
+ $photo_failure = false;
+
+ $filename = basename($contact['photo']);
+ $img_str = fetch_url($contact['photo'],true);
+ $img = new Photo($img_str);
+ if($img->is_valid()) {
+
+ $img->scaleImageSquare(175);
+
+ $hash = photo_new_resource();
+
+ $r = $img->store($uid, $contact_id, $hash, $filename, t('Contact Photos'), 4 );
+
+ if($r === false)
+ $photo_failure = true;
+
+ $img->scaleImage(80);
+
+ $r = $img->store($uid, $contact_id, $hash, $filename, t('Contact Photos'), 5 );
+
+ if($r === false)
+ $photo_failure = true;
+
+ $photo = $a->get_baseurl() . '/photo/' . $hash . '-4.jpg';
+ $thumb = $a->get_baseurl() . '/photo/' . $hash . '-5.jpg';
+ }
+ else
+ $photo_failure = true;
+
+ if($photo_failure) {
+ $photo = $a->get_baseurl() . '/images/default-profile.jpg';
+ $thumb = $a->get_baseurl() . '/images/default-profile-sm.jpg';
+ }
+
+
+ if($contact['network'] === 'dfrn') {
+
+ $new_relation = REL_VIP;
+ if(($relation == REL_FAN) || ($duplex))
+ $new_relation = REL_BUD;
+
+ $r = q("UPDATE `contact` SET `photo` = '%s',
+ `thumb` = '%s',
+ `rel` = %d,
+ `name-date` = '%s',
+ `uri-date` = '%s',
+ `avatar-date` = '%s',
+ `blocked` = 0,
+ `pending` = 0,
+ `duplex` = %d,
+ `network` = 'dfrn' WHERE `id` = %d LIMIT 1
+ ",
+ dbesc($photo),
+ dbesc($thumb),
+ intval($new_relation),
+ dbesc(datetime_convert()),
+ dbesc(datetime_convert()),
+ dbesc(datetime_convert()),
+ intval($duplex),
+ intval($contact_id)
+ );
+ }
+ else {
+
+ $notify = '';
+ $poll = '';
+
+ // $contact['network'] !== 'dfrn'
+
+ $arr = lrdd($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)
+ );
+
+ $r = q("UPDATE `contact` SET `photo` = '%s',
+ `thumb` = '%s',
+ `name-date` = '%s',
+ `uri-date` = '%s',
+ `avatar-date` = '%s',
+ `notify` = '%s',
+ `poll` = '%s',
+ `blocked` = 0,
+ `pending` = 0
+ WHERE `id` = %d LIMIT 1
+ ",
+ dbesc($photo),
+ dbesc($thumb),
+ dbesc(datetime_convert()),
+ dbesc(datetime_convert()),
+ dbesc(datetime_convert()),
+ dbesc($notify),
+ dbesc($poll),
+ intval($contact_id)
+ );
+ }
+
+ if($r === false)
+ notice( t('Unable to set contact photo.') . EOL);
+
+
+ // Let's send our user to the contact editor in case they want to
+ // do anything special with this new friend.
+
+ if($handsfree === null)
+ goaway($a->get_baseurl() . '/contacts/' . intval($contact_id));
+ return; //NOTREACHED
+
+ }
+
+
+
+ // End of first scenario. [Local confirmation of remote friend request].
+
+
+
+ // Begin scenario two. 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.
if(x($_POST,'source_url')) {
// We are processing an external confirmation to an introduction created by our user.
$public_key = $_POST['public_key'];
- $dfrn_id = $_POST['dfrn_id'];
- $source_url = $_POST['source_url'];
+ $dfrn_id = hex2bin($_POST['dfrn_id']);
+ $source_url = hex2bin($_POST['source_url']);
$aes_key = $_POST['aes_key'];
$duplex = $_POST['duplex'];
- $version_id = $_POST['dfrn_version'];
+ $version_id = (float) $_POST['dfrn_version'];
+
+
+ // If $aes_key is set, both of these items require unpacking from the hex transport encoding.
+
+ if(x($aes_key)) {
+ $aes_key = hex2bin($aes_key);
+ $public_key = hex2bin($public_key);
+ }
// Find our user's account
$my_prvkey = $r[0]['prvkey'];
$local_uid = $r[0]['uid'];
+
+ if(! strstr($my_prvkey,'BEGIN RSA PRIVATE KEY')) {
+ $message = t('Our site encryption key is apparently messed up.');
+ xml_status(3,$message);
+ }
+
// verify everything
$decrypted_source_url = "";
if(! strlen($decrypted_source_url)) {
- $message = t('empty site URL was provided.');
+ $message = t('Empty site URL was provided or URL could not be decrypted by us.');
xml_status(3,$message);
// NOTREACHED
}
intval($local_uid)
);
if(count($r)) {
- $message = t('The ID provided is a duplicate on our system. Please try again.');
+ $message = t('The ID provided by your system is a duplicate on our system. It should work if you try again.');
xml_status(1,$message); // Birthday paradox - duplicate dfrn-id
// NOTREACHED
}
intval($dfrn_record)
);
if(! count($r)) {
- $message = t('Unable to set your credentials on our system.');
+ $message = t('Unable to set your contact credentials on our system.');
xml_status(3,$message);
}
intval($duplex),
intval($dfrn_record)
);
- if($r === false) { // should not happen unless schema is messed up
- $message = t('Unable to update your contact profile on our system');
+ if($r === false) { // indicates schema is messed up or total db failure
+ $message = t('Unable to update your contact profile details on our system');
xml_status(3,$message);
}
$res = mail($r[0]['email'], t("Connection accepted at ") . $a->config['sitename'],
$email_tpl, 'From: ' . t('Administrator') . '@' . $_SERVER[SERVER_NAME] );
if(!$res) {
- notice( t("Email notification failed.") . EOL );
+ // pointless throwing an error here and confusing the person at the other end of the wire.
}
}
xml_status(0); // Success
return; // NOTREACHED
- ////////////////////// End of this scenario ///////////////////////////////////////////////
+ ////////////////////// End of this scenario ///////////////////////////////////////////////
}
- else {
-
- // We are processing a local confirmation initiated on this system by our user to an external introduction.
-
- $uid = get_uid();
-
- if(! $uid) {
- notice( t('Permission denied.') . EOL );
- return;
- }
-
- $dfrn_id = ((x($_POST,'dfrn_id')) ? notags(trim($_POST['dfrn_id'])) : "");
- $intro_id = intval($_POST['intro_id']);
- $duplex = intval($_POST['duplex']);
-
- $r = q("SELECT * FROM `contact` WHERE `issued-id` = '%s' AND `uid` = %d LIMIT 1",
- dbesc($dfrn_id),
- intval($uid)
- );
-
- if(! count($r)) {
- notice( t('Node does not exist.') . EOL );
- return;
- }
-
- $contact_id = $r[0]['id'];
- $relation = $r[0]['rel'];
- $site_pubkey = $r[0]['site-pubkey'];
- $dfrn_confirm = $r[0]['confirm'];
- $aes_allow = $r[0]['aes_allow'];
-
- $res = openssl_pkey_new(array(
- 'digest_alg' => 'whirlpool',
- '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"];
-
- $r = q("UPDATE `contact` SET `prvkey` = '%s' WHERE `id` = %d AND `uid` = %d LIMIT 1",
- dbesc($private_key),
- intval($contact_id),
- intval($uid)
- );
-
-
- $params = array();
-
- $src_aes_key = random_string();
-
- $result = '';
- openssl_private_encrypt($dfrn_id,$result,$a->user['prvkey']);
-
- $params['dfrn_id'] = $result;
- $params['public_key'] = $public_key;
-
-
- $my_url = $a->get_baseurl() . '/profile/' . $a->user['nickname'];
-
- openssl_public_encrypt($my_url, $params['source_url'], $site_pubkey);
-
- if($aes_allow && function_exists('openssl_encrypt')) {
- openssl_public_encrypt($src_aes_key, $params['aes_key'], $site_pubkey);
- $params['public_key'] = openssl_encrypt($public_key,'AES-256-CBC',$src_aes_key);
- }
-
- $params['dfrn_version'] = '2.0';
- if($duplex == 1)
- $params['duplex'] = 1;
-
- $res = post_url($dfrn_confirm,$params);
-
- // 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);
- 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)) {
-
- //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;
-
- require_once("Photo.php");
-
- $photo_failure = false;
-
- $r = q("SELECT `photo` FROM `contact` WHERE `id` = %d LIMIT 1",
- intval($contact_id));
- if(count($r)) {
-
- $filename = basename($r[0]['photo']);
- $img_str = fetch_url($r[0]['photo'],true);
- $img = new Photo($img_str);
- if($img->is_valid()) {
-
- $img->scaleImageSquare(175);
-
- $hash = photo_new_resource();
-
- $r = $img->store($uid, $contact_id, $hash, $filename, t('Contact Photos'), 4 );
-
- if($r === false)
- $photo_failure = true;
-
- $img->scaleImage(80);
-
- $r = $img->store($uid, $contact_id, $hash, $filename, t('Contact Photos'), 5 );
-
- if($r === false)
- $photo_failure = true;
-
- $photo = $a->get_baseurl() . '/photo/' . $hash . '-4.jpg';
- $thumb = $a->get_baseurl() . '/photo/' . $hash . '-5.jpg';
- }
- else
- $photo_failure = true;
- }
- else
- $photo_failure = true;
- if($photo_failure) {
- $photo = $a->get_baseurl() . '/images/default-profile.jpg';
- $thumb = $a->get_baseurl() . '/images/default-profile-sm.jpg';
- }
+ // somebody arrived here by mistake or they are fishing. Send them to the homepage.
- $new_relation = REL_VIP;
- if(($relation == REL_FAN) || ($duplex))
- $new_relation = REL_BUD;
+ goaway($a->get_baseurl());
+ // NOTREACHED
- $r = q("UPDATE `contact` SET `photo` = '%s',
- `thumb` = '%s',
- `rel` = %d,
- `name-date` = '%s',
- `uri-date` = '%s',
- `avatar-date` = '%s',
- `blocked` = 0,
- `pending` = 0,
- `duplex` = %d,
- `network` = 'dfrn' WHERE `id` = %d LIMIT 1
- ",
- dbesc($photo),
- dbesc($thumb),
- intval($new_relation),
- dbesc(datetime_convert()),
- dbesc(datetime_convert()),
- dbesc(datetime_convert()),
- intval($duplex),
- intval($contact_id)
- );
- if($r === false)
- notice( t('Unable to set contact photo.') . EOL);
-
- goaway($a->get_baseurl() . '/contacts/' . intval($contact_id));
- return; //NOTREACHED
- }
- return;
}