start of v4

2 files changed, 420 insertions, 0 deletions

diff --git a/include/message.php b/include/message.php
index 6a9e8328a..940fcc275 100644
--- a/include/message.php
+++ b/include/message.php
@@ -506,3 +506,4 @@ function private_messages_fetch_conversation($channel_id, $messageitem_id, $upda
 	return $messages;
 
 }
+
diff --git a/include/zot.php b/include/zot.php
index d41d5e828..fa6258140 100644
--- a/include/zot.php
+++ b/include/zot.php
@@ -3989,3 +3989,422 @@ function delivery_report_is_storable($dr) {
 }
 
 
+
+function update_hub_connected($hub,$sitekey = '') {
+
+	if($sitekey) {
+
+		/*
+		 * This hub has now been proven to be valid.
+		 * Any hub with the same URL and a different sitekey cannot be valid.
+		 * Get rid of them (mark them deleted). There's a good chance they were re-installs.
+		 */
+	
+		q("update hubloc set hubloc_deleted = 1, hubloc_error = 1 where hubloc_url = '%s' and hubloc_sitekey != '%s' ",
+			dbesc($hub['hubloc_url']),
+			dbesc($sitekey)
+		);
+
+	}
+	else {
+		$sitekey = $hub['sitekey'];
+	}
+
+	// $sender['sitekey'] is a new addition to the protcol to distinguish 
+	// hublocs coming from re-installed sites. Older sites will not provide
+	// this field and we have to still mark them valid, since we can't tell
+	// if this hubloc has the same sitekey as the packet we received.
+
+
+	// Update our DB to show when we last communicated successfully with this hub
+	// This will allow us to prune dead hubs from using up resources
+
+	$r = q("update hubloc set hubloc_connected = '%s' where hubloc_id = %d and hubloc_sitekey = '%s' ",
+		dbesc(datetime_convert()),
+		intval($hub['hubloc_id']),
+		dbesc($sitekey)
+	);
+
+	// a dead hub came back to life - reset any tombstones we might have
+
+	if(intval($hub['hubloc_error'])) {
+		q("update hubloc set hubloc_error = 0 where hubloc_id = %d and hubloc_sitekey = '%s' ",
+			intval($hub['hubloc_id']),
+			dbesc($sitekey)		
+		);
+		if(intval($r[0]['hubloc_orphancheck'])) {
+			q("update hubloc set hubloc_orhpancheck = 0 where hubloc_id = %d and hubloc_sitekey = '%s' ",
+				intval($hub['hubloc_id']),
+				dbesc($sitekey)
+			);
+		}
+		q("update xchan set xchan_orphan = 0 where xchan_orphan = 1 and xchan_hash = '%s'",
+			dbesc($hub['hubloc_hash'])
+		);
+	}
+		
+	return $hub['hubloc_url'];
+}
+
+
+function zot_reply_ping() {
+
+	$ret = array('success'=> false);
+
+	// Useful to get a health check on a remote site.
+	// This will let us know if any important communication details
+	// that we may have stored are no longer valid, regardless of xchan details.
+	logger('POST: got ping send pong now back: ' . z_root() , LOGGER_DEBUG );
+ 
+	$ret['success'] = true;
+	$ret['site'] = array();
+	$ret['site']['url'] = z_root();
+	$ret['site']['url_sig'] = base64url_encode(rsa_sign(z_root(),get_config('system','prvkey')));
+	$ret['site']['sitekey'] = get_config('system','pubkey');
+	json_return_and_die($ret);
+}
+
+function zot_reply_pickup($data) {
+
+	$ret = array('success'=> false);
+
+	/*
+	 * The 'pickup' message arrives with a tracking ID which is associated with a particular outq_hash
+	 * First verify that that the returned signatures verify, then check that we have an outbound queue item
+	 * with the correct hash.
+	 * If everything verifies, find any/all outbound messages in the queue for this hubloc and send them back
+	 */
+
+	if((! $data['secret']) || (! $data['secret_sig'])) {
+		$ret['message'] = 'no verification signature';
+		logger('mod_zot: pickup: ' . $ret['message'], LOGGER_DEBUG);
+		json_return_and_die($ret);
+	}
+
+	$r = q("select distinct hubloc_sitekey from hubloc where hubloc_url = '%s' and hubloc_callback = '%s' and hubloc_sitekey != '' group by hubloc_sitekey ",
+		dbesc($data['url']),
+		dbesc($data['callback'])
+	);
+	if(! $r) {
+		$ret['message'] = 'site not found';
+		logger('mod_zot: pickup: ' . $ret['message']);
+		json_return_and_die($ret);
+	}
+
+	foreach ($r as $hubsite) {
+
+		// verify the url_sig
+		// If the server was re-installed at some point, there could be multiple hubs with the same url and callback.
+		// Only one will have a valid key.
+
+		$forgery = true;
+		$secret_fail = true;
+
+		$sitekey = $hubsite['hubloc_sitekey'];
+
+		logger('mod_zot: Checking sitekey: ' . $sitekey, LOGGER_DATA);
+
+		if(rsa_verify($data['callback'],base64url_decode($data['callback_sig']),$sitekey)) {
+			$forgery = false;
+		}
+		if(rsa_verify($data['secret'],base64url_decode($data['secret_sig']),$sitekey)) {
+			$secret_fail = false;
+		}
+		if((! $forgery) && (! $secret_fail))
+			break;
+	}
+
+	if($forgery) {
+		$ret['message'] = 'possible site forgery';
+		logger('mod_zot: pickup: ' . $ret['message']);
+		json_return_and_die($ret);
+	}
+
+	if($secret_fail) {
+		$ret['message'] = 'secret validation failed';
+		logger('mod_zot: pickup: ' . $ret['message']);
+		json_return_and_die($ret);
+	}
+
+	/*
+	 * If we made it to here, the signatures verify, but we still don't know if the tracking ID is valid.
+	 * It wouldn't be an error if the tracking ID isn't found, because we may have sent this particular
+	 * queue item with another pickup (after the tracking ID for the other pickup  was verified). 
+	 */
+
+	$r = q("select outq_posturl from outq where outq_hash = '%s' and outq_posturl = '%s' limit 1",
+		dbesc($data['secret']),
+		dbesc($data['callback'])
+	);
+	if(! $r) {
+		$ret['message'] = 'nothing to pick up';
+		logger('mod_zot: pickup: ' . $ret['message']);
+		json_return_and_die($ret);
+	}
+
+	/*
+	 * Everything is good if we made it here, so find all messages that are going to this location
+	 * and send them all.
+	 */
+
+	$r = q("select * from outq where outq_posturl = '%s'",
+		dbesc($data['callback'])
+	);
+	if($r) {
+		logger('mod_zot: successful pickup message received from ' . $data['callback'] . ' ' . count($r) . ' message(s) picked up', LOGGER_DEBUG);
+
+		$ret['success'] = true;
+		$ret['pickup'] = array();
+		foreach($r as $rr) {
+			if($rr['outq_msg']) {
+				$x = json_decode($rr['outq_msg'],true);
+
+				if(! $x)
+					continue;
+
+				if(array_key_exists('message_list',$x)) {
+					foreach($x['message_list'] as $xx) {
+						$ret['pickup'][] = array('notify' => json_decode($rr['outq_notify'],true),'message' => $xx);
+					}
+				}
+				else
+					$ret['pickup'][] = array('notify' => json_decode($rr['outq_notify'],true),'message' => $x);
+				$x = q("delete from outq where outq_hash = '%s'",
+					dbesc($rr['outq_hash'])
+				);
+			}
+		}
+	}
+
+	$encrypted = crypto_encapsulate(json_encode($ret),$sitekey);
+	json_return_and_die($encrypted);
+
+	/* pickup: end */
+}
+
+
+
+function zot_reply_auth_check($data,$encrypted_packet) {
+
+	$ret = array('success' => false);
+
+	/*
+	 * Requestor visits /magic/?dest=somewhere on their own site with a browser
+	 * magic redirects them to $destsite/post [with auth args....]
+	 * $destsite sends an auth_check packet to originator site
+	 * The auth_check packet is handled here by the originator's site 
+	 * - the browser session is still waiting
+	 * inside $destsite/post for everything to verify
+	 * If everything checks out we'll return a token to $destsite
+	 * and then $destsite will verify the token, authenticate the browser
+	 * session and then redirect to the original destination.
+	 * If authentication fails, the redirection to the original destination
+	 * will still take place but without authentication.
+	 */
+	logger('mod_zot: auth_check', LOGGER_DEBUG);
+
+	if (! $encrypted_packet) {
+		logger('mod_zot: auth_check packet was not encrypted.');
+		$ret['message'] .= 'no packet encryption' . EOL;
+		json_return_and_die($ret);
+	}
+
+	$arr = $data['sender'];
+	$sender_hash = make_xchan_hash($arr['guid'],$arr['guid_sig']);
+
+	// garbage collect any old unused notifications
+
+	// This was and should be 10 minutes but my hosting provider has time lag between the DB and 
+	// the web server. We should probably convert this to webserver time rather than DB time so 
+	// that the different clocks won't affect it and allow us to keep the time short. 
+
+	q("delete from verify where type = 'auth' and created < %s - INTERVAL %s",
+		db_utcnow(), db_quoteinterval('30 MINUTE')
+	);
+
+	$y = q("select xchan_pubkey from xchan where xchan_hash = '%s' limit 1",
+		dbesc($sender_hash)
+	);
+
+	// We created a unique hash in mod/magic.php when we invoked remote auth, and stored it in
+	// the verify table. It is now coming back to us as 'secret' and is signed by a channel at the other end.
+	// First verify their signature. We will have obtained a zot-info packet from them as part of the sender
+	// verification. 
+
+	if ((! $y) || (! rsa_verify($data['secret'], base64url_decode($data['secret_sig']),$y[0]['xchan_pubkey']))) {
+		logger('mod_zot: auth_check: sender not found or secret_sig invalid.');
+		$ret['message'] .= 'sender not found or sig invalid ' . print_r($y,true) . EOL;
+		json_return_and_die($ret);
+	}
+
+	// There should be exactly one recipient, the original auth requestor
+
+	$ret['message'] .= 'recipients ' . print_r($recipients,true) . EOL;
+
+	if ($data['recipients']) {
+
+		$arr = $data['recipients'][0];
+		$recip_hash = make_xchan_hash($arr['guid'], $arr['guid_sig']);
+		$c = q("select channel_id, channel_account_id, channel_prvkey from channel where channel_hash = '%s' limit 1",
+			dbesc($recip_hash)
+		);
+		if (! $c) {
+			logger('mod_zot: auth_check: recipient channel not found.');
+			$ret['message'] .= 'recipient not found.' . EOL;
+			json_return_and_die($ret);
+		}
+
+		$confirm = base64url_encode(rsa_sign($data['secret'] . $recip_hash,$c[0]['channel_prvkey']));
+
+		// This additionally checks for forged sites since we already stored the expected result in meta
+		// and we've already verified that this is them via zot_gethub() and that their key signed our token
+
+		$z = q("select id from verify where channel = %d and type = 'auth' and token = '%s' and meta = '%s' limit 1",
+			intval($c[0]['channel_id']),
+			dbesc($data['secret']),
+			dbesc($data['sender']['url'])
+		);
+		if (! $z) {
+			logger('mod_zot: auth_check: verification key not found.');
+			$ret['message'] .= 'verification key not found' . EOL;
+			json_return_and_die($ret);
+		}
+		$r = q("delete from verify where id = %d",
+			intval($z[0]['id'])
+		);
+
+		$u = q("select account_service_class from account where account_id = %d limit 1",
+			intval($c[0]['channel_account_id'])
+		);
+
+		logger('mod_zot: auth_check: success', LOGGER_DEBUG);
+		$ret['success'] = true;
+		$ret['confirm'] = $confirm;
+		if ($u && $u[0]['account_service_class'])
+			$ret['service_class'] = $u[0]['account_service_class'];
+
+		// Set "do not track" flag if this site or this channel's profile is restricted
+		// in some way
+
+		if (intval(get_config('system','block_public')))
+			$ret['DNT'] = true;
+		if (! perm_is_allowed($c[0]['channel_id'],'','view_profile'))
+			$ret['DNT'] = true;
+		if (get_pconfig($c[0]['channel_id'],'system','do_not_track'))
+			$ret['DNT'] = true;
+		if (get_pconfig($c[0]['channel_id'],'system','hide_online_status'))
+			$ret['DNT'] = true;
+
+		json_return_and_die($ret);
+	}
+	json_return_and_die($ret);
+}
+
+
+function zot_reply_purge($sender,$recipients) {
+
+	$ret = array('success' => false);
+
+	if ($recipients) {
+		// basically this means "unfriend"
+		foreach ($recipients as $recip) {
+			$r = q("select channel.*,xchan.* from channel 
+				left join xchan on channel_hash = xchan_hash
+				where channel_guid = '%s' and channel_guid_sig = '%s' limit 1",
+				dbesc($recip['guid']),
+				dbesc($recip['guid_sig'])
+			);
+			if ($r) {
+				$r = q("select abook_id from abook where uid = %d and abook_xchan = '%s' limit 1",
+					intval($r[0]['channel_id']),
+					dbesc(make_xchan_hash($sender['guid'],$sender['guid_sig']))
+				);
+				if ($r) {
+					contact_remove($r[0]['channel_id'],$r[0]['abook_id']);
+				}
+			}
+		}
+		$ret['success'] = true;
+	} 
+	else {
+		// Unfriend everybody - basically this means the channel has committed suicide
+		$arr = $sender;
+		$sender_hash = make_xchan_hash($arr['guid'],$arr['guid_sig']);
+
+		require_once('include/Contact.php');
+		remove_all_xchan_resources($sender_hash);	
+
+		$ret['success'] = true;
+		json_return_and_die($ret);
+	}
+
+	json_return_and_die($ret);
+}
+
+
+function zot_reply_refresh($sender,$recipients) {
+
+	$ret = array('success' => false);
+
+	// remote channel info (such as permissions or photo or something)
+	// has been updated. Grab a fresh copy and sync it.
+	// The difference between refresh and force_refresh is that 
+	// force_refresh unconditionally creates a directory update record,
+	// even if no changes were detected upon processing.
+
+	if($recipients) {
+
+		// This would be a permissions update, typically for one connection
+
+		foreach ($recipients as $recip) {
+			$r = q("select channel.*,xchan.* from channel 
+				left join xchan on channel_hash = xchan_hash
+				where channel_guid = '%s' and channel_guid_sig = '%s' limit 1",
+				dbesc($recip['guid']),
+				dbesc($recip['guid_sig'])
+			);
+
+			$x = zot_refresh(array(
+					'xchan_guid'     => $sender['guid'], 
+					'xchan_guid_sig' => $sender['guid_sig'],
+					'hubloc_url'     => $sender['url']
+			), $r[0], (($msgtype === 'force_refresh') ? true : false));
+		}
+	} 
+	else {
+			// system wide refresh
+
+		$x = zot_refresh(array(
+			'xchan_guid'     => $sender['guid'], 
+			'xchan_guid_sig' => $sender['guid_sig'],
+			'hubloc_url'     => $sender['url']
+		), null, (($msgtype === 'force_refresh') ? true : false));
+	}
+
+	$ret['success'] = true;
+	json_return_and_die($ret);
+
+}
+
+
+function zot_reply_notify($data) {
+
+	$ret = array('success' => false);
+
+	logger('notify received from ' . $connecting_url);
+
+	$async = get_config('system','queued_fetch');
+
+	if($async) {
+		// add to receive queue
+		// qreceive_add($data);
+	} 
+	else {
+		$x = zot_fetch($data);
+		$ret['delivery_report'] = $x;
+	}
+
+	$ret['success'] = true;
+	json_return_and_die($ret);
+
+}
\ No newline at end of file