From 6a7fa6bf5414a89c27f4f7d8da1ad8bb33d7c5a1 Mon Sep 17 00:00:00 2001
From: zotlabs <mike@macgirvin.com>
Date: Mon, 24 Jul 2017 20:23:00 -0700
Subject: provide a keychange operation to rebase an identity on a new keypair

---
 include/channel.php |  99 +++++++++++++++++++++++
 include/xchan.php   | 229 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 include/zot.php     |  44 ++++++++++
 3 files changed, 372 insertions(+)

(limited to 'include')

diff --git a/include/channel.php b/include/channel.php
index 49da57fd6..23ceb1414 100644
--- a/include/channel.php
+++ b/include/channel.php
@@ -454,6 +454,105 @@ function create_identity($arr) {
 	return $ret;
 }
 
+
+function change_channel_keys($channel) {
+
+	$ret = array('success' => false);
+
+	$stored = [];
+
+	$key = new_keypair(4096);
+
+	$sig = base64url_encode(rsa_sign($channel['channel_guid'],$key['prvkey']));
+	$hash = make_xchan_hash($channel['channel_guid'],$sig);
+
+	$stored['old_guid']     = $channel['channel_guid'];
+	$stored['old_guid_sig'] = $channel['channel_guid_sig'];
+	$stored['old_key']      = $channel['channel_pubkey'];
+	$stored['old_hash']     = $channel['channel_hash'];
+
+	$stored['new_key']      = $key['pubkey'];
+	$stored['new_sig']      = base64url_encode(rsa_sign($key['pubkey'],$channel['channel_prvkey']));
+
+	// Save this info for the notifier to collect
+
+	set_pconfig($channel['channel_id'],'system','keychange',$stored);
+
+	$r = q("update channel set channel_prvkey = '%s', channel_pubkey = '%s', channel_guid_sig = '%s', channel_hash = '%s' where channel_id = %d",
+		dbesc($key['prvkey']),
+		dbesc($key['pubkey']),
+		dbesc($sig),
+		dbesc($hash),
+		intval($channel['channel_id'])
+	);
+	if(! $r) {
+		return $ret;
+ 	}
+	$r = q("select * from channel where channel_id = %d",
+		intval($channel['channel_id'])
+	);
+
+	if(! $r) {
+		$ret['message'] = t('Unable to retrieve modified identity');
+		return $ret;
+	}
+
+	$modified = $r[0];
+
+	$h = q("select * from hubloc where hubloc_hash = '%s' and hubloc_url = '%s' ",
+		dbesc($stored['old_hash']),
+		dbesc(z_root())
+	);
+
+	if($h) {
+		foreach($h as $hv) {
+			$hv['hubloc_guid_sig'] = $sig;
+			$hv['hubloc_hash']     = $hash;
+			$hv['hubloc_url_sig']  = base64url_encode(rsa_sign(z_root(),$modifed['channel_prvkey']));
+			hubloc_store_lowlevel($hv);
+		}
+	}
+
+	$x = q("select * from xchan where xchan_hash = '%s' ",
+		dbesc($stored['old_hash'])
+	);
+
+	$check = q("select * from xchan where xchan_hash = '%s'",
+		dbesc($hash)
+	);
+
+	if(($x) && (! $check)) {
+		$oldxchan = $x[0];
+		foreach($x as $xv) {
+			$xv['xchan_guid_sig']  = $sig;
+			$xv['xchan_hash']      = $hash;
+			$xv['xchan_pubkey']    = $key['pubkey'];
+			xchan_store_lowlevel($xv);
+			$newxchan = $xv;
+		}
+	}
+
+	$a = q("select * from abook where abook_xchan = '%s' and abook_self = 1",
+		dbesc($stored['old_hash'])
+	);
+
+	if($a) {
+		q("update abook set abook_xchan = '%s' where abook_id = %d",
+			dbesc($hash),
+			intval($a[0]['abook_id'])
+		);
+	}
+
+	xchan_change_key($oldxchan,$newxchan,$stored);
+
+	Zotlabs\Daemon\Master::Summon(array('Notifier', 'keychange', $channel['channel_id']));
+
+	$ret['success'] = true;
+	return $ret;
+}
+
+
+
 /**
  * @brief Set default channel to be used on login.
  *
diff --git a/include/xchan.php b/include/xchan.php
index 12eb674fa..dba0b8b88 100644
--- a/include/xchan.php
+++ b/include/xchan.php
@@ -137,3 +137,232 @@ function xchan_fetch($arr) {
 }
 
 
+function xchan_change_key($oldx,$newx,$data) {
+
+	$r = q("update abook set abook_xchan = '%s' where abook_xchan = '%s'",
+		dbsec($newx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	$r = q("update abconfig set xchan = '%s' where xchan = '%s'",
+		dbsec($newx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	$r = q("update group_member set xchan = '%s' where xchan = '%s'",
+		dbsec($newx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	$r = q("update chat set chat_xchan = '%s' where chat_xchan = '%s'",
+		dbsec($newx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	$r = q("update chatpresence set cp_xchan = '%s' where cp_xchan = '%s'",
+		dbsec($newx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	$r = q("update event set event_xchan = '%s' where event_xchan = '%s'",
+		dbsec($newx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	$r = q("update item set owner_xchan = '%s' where owner_xchan = '%s'",
+		dbsec($newx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	$r = q("update item set author_xchan = '%s' where author_xchan = '%s'",
+		dbsec($newx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	$r = q("update item set source_xchan = '%s' where source_xchan = '%s'",
+		dbsec($newx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	$r = q("update mail set from_xchan = '%s' where from_xchan = '%s'",
+		dbsec($newx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	$r = q("update mail set to_xchan = '%s' where to_xchan = '%s'",
+		dbsec($newx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	$r = q("update shares set share_xchan = '%s' where share_xchan = '%s'",
+		dbsec($newx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	$r = q("update source set src_channel_xchan = '%s' where src_channel_xchan = '%s'",
+		dbsec($newx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	$r = q("update source set src_xchan = '%s' where src_xchan = '%s'",
+		dbsec($newx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	$r = q("update xchat set xchat_xchan = '%s' where xchat_xchan = '%s'",
+		dbsec($newx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	$r = q("update xconfig set xchan = '%s' where xchan = '%s'",
+		dbsec($newx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	$r = q("update xign set xchan = '%s' where xchan = '%s'",
+		dbsec($newx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	$r = q("update xlink set xlink_xchan = '%s' where xlink_xchan = '%s'",
+		dbsec($newx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	$r = q("update xprof set xprof_hash = '%s' where xprof_hash = '%s'",
+		dbsec($newx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	$r = q("update xtag set xtag_hash = '%s' where xtag_hash = '%s'",
+		dbsec($newx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	$r = q("select channel_id, channel_allow_cid, channel_deny_cid from channel where (channel_allow_cid like '%s' or channel_deny_cid like '%s') ",
+		dbesc($oldx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	if($r) {
+		foreach($r as $rv) {
+			$z = q("update channel set channel_allow_cid = '%s', channel_deny_cid = '%s' where channel_id = %d",
+				dbesc(str_replace('<' . $oldx['xchan_hash'] . '>', '<' . $newx['xchan_hash'] . '>', $rv['channel_allow_cid'])),
+				dbesc(str_replace('<' . $oldx['xchan_hash'] . '>', '<' . $newx['xchan_hash'] . '>', $rv['channel_deny_cid'])),
+				intval($rv['channel_id'])
+			);
+		}
+	}
+
+	$r = q("select id, allow_cid, deny_cid from attach where (allow_cid like '%s' or deny_cid like '%s') ",
+		dbesc($oldx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	if($r) {
+		foreach($r as $rv) {
+			$z = q("update attach set allow_cid = '%s', deny_cid = '%s' where id = %d",
+				dbesc(str_replace('<' . $oldx['xchan_hash'] . '>', '<' . $newx['xchan_hash'] . '>', $rv['allow_cid'])),
+				dbesc(str_replace('<' . $oldx['xchan_hash'] . '>', '<' . $newx['xchan_hash'] . '>', $rv['deny_cid'])),
+				intval($rv['id'])
+			);
+		}
+	}
+
+	$r = q("select cr_id, allow_cid, deny_cid from chatroom where (allow_cid like '%s' or deny_cid like '%s') ",
+		dbesc($oldx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	if($r) {
+		foreach($r as $rv) {
+			$z = q("update chatroom set allow_cid = '%s', deny_cid = '%s' where cr_id = %d",
+				dbesc(str_replace('<' . $oldx['xchan_hash'] . '>', '<' . $newx['xchan_hash'] . '>', $rv['allow_cid'])),
+				dbesc(str_replace('<' . $oldx['xchan_hash'] . '>', '<' . $newx['xchan_hash'] . '>', $rv['deny_cid'])),
+				intval($rv['cr_id'])
+			);
+		}
+	}
+
+
+	$r = q("select id, allow_cid, deny_cid from event where (allow_cid like '%s' or deny_cid like '%s') ",
+		dbesc($oldx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	if($r) {
+		foreach($r as $rv) {
+			$z = q("update event set allow_cid = '%s', deny_cid = '%s' where id = %d",
+				dbesc(str_replace('<' . $oldx['xchan_hash'] . '>', '<' . $newx['xchan_hash'] . '>', $rv['allow_cid'])),
+				dbesc(str_replace('<' . $oldx['xchan_hash'] . '>', '<' . $newx['xchan_hash'] . '>', $rv['deny_cid'])),
+				intval($rv['id'])
+			);
+		}
+	}
+
+
+	$r = q("select id, allow_cid, deny_cid from item where (allow_cid like '%s' or deny_cid like '%s') ",
+		dbesc($oldx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	if($r) {
+		foreach($r as $rv) {
+			$z = q("update item set allow_cid = '%s', deny_cid = '%s' where id = %d",
+				dbesc(str_replace('<' . $oldx['xchan_hash'] . '>', '<' . $newx['xchan_hash'] . '>', $rv['allow_cid'])),
+				dbesc(str_replace('<' . $oldx['xchan_hash'] . '>', '<' . $newx['xchan_hash'] . '>', $rv['deny_cid'])),
+				intval($rv['id'])
+			);
+		}
+	}
+
+
+	$r = q("select mitem_id, allow_cid, deny_cid from menu_item where (allow_cid like '%s' or deny_cid like '%s') ",
+		dbesc($oldx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	if($r) {
+		foreach($r as $rv) {
+			$z = q("update menu_item set allow_cid = '%s', deny_cid = '%s' where mitem_id = %d",
+				dbesc(str_replace('<' . $oldx['xchan_hash'] . '>', '<' . $newx['xchan_hash'] . '>', $rv['allow_cid'])),
+				dbesc(str_replace('<' . $oldx['xchan_hash'] . '>', '<' . $newx['xchan_hash'] . '>', $rv['deny_cid'])),
+				intval($rv['mitem_id'])
+			);
+		}
+	}
+
+
+
+	$r = q("select obj_id, allow_cid, deny_cid from obj where (allow_cid like '%s' or deny_cid like '%s') ",
+		dbesc($oldx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	if($r) {
+		foreach($r as $rv) {
+			$z = q("update obj set allow_cid = '%s', deny_cid = '%s' where obj_id = %d",
+				dbesc(str_replace('<' . $oldx['xchan_hash'] . '>', '<' . $newx['xchan_hash'] . '>', $rv['allow_cid'])),
+				dbesc(str_replace('<' . $oldx['xchan_hash'] . '>', '<' . $newx['xchan_hash'] . '>', $rv['deny_cid'])),
+				intval($rv['obj_id'])
+			);
+		}
+	}
+
+	$r = q("select id, allow_cid, deny_cid from photo where (allow_cid like '%s' or deny_cid like '%s') ",
+		dbesc($oldx['xchan_hash']),
+		dbesc($oldx['xchan_hash'])
+	);
+
+	if($r) {
+		foreach($r as $rv) {
+			$z = q("update photo set allow_cid = '%s', deny_cid = '%s' where id = %d",
+				dbesc(str_replace('<' . $oldx['xchan_hash'] . '>', '<' . $newx['xchan_hash'] . '>', $rv['allow_cid'])),
+				dbesc(str_replace('<' . $oldx['xchan_hash'] . '>', '<' . $newx['xchan_hash'] . '>', $rv['deny_cid'])),
+				intval($rv['id'])
+			);
+		}
+	}
+
+
+}
\ No newline at end of file
diff --git a/include/zot.php b/include/zot.php
index 8bbc4a969..220292994 100644
--- a/include/zot.php
+++ b/include/zot.php
@@ -3757,6 +3757,50 @@ function zot_reply_message_request($data) {
 	json_return_and_die($ret);
 }
 
+function zot_rekey_request($sender,$data) {
+
+	$ret = array('success' => false);
+
+	//	newsig is newkey signed with oldkey
+
+	// The original xchan will remain. In Zot/Receiver we will have imported the new xchan and hubloc to verify
+	// the packet authenticity. What we will do now is verify that the keychange operation was signed by the 
+	// oldkey, and if so change all the abook, abconfig, group, and permission elements which reference the 
+	// old xchan_hash. 
+
+	if((! $data['oldkey']) && (! $data['oldsig']) && (! $data['newkey']) && (! $data['newsig']))
+		json_return_and_die($ret);
+
+	$oldhash = make_xchan_hash($data['old_guid'],$data['old_guid_sig']);
+
+	$r = q("select * from xchan where xchan_hash = '%s' limit 1",
+		dbesc($oldhash)
+	);
+
+	if(! $r) {
+		json_return_and_die($ret);
+	}
+
+	$xchan = $r[0];
+
+	if(! rsa_verify($data['newkey'],base64url_decode($data['newsig']),$xchan['xchan_pubkey'])) {
+		json_return_and_die($ret);
+	}
+
+	$newhash = make_xchan_hash($sender['guid'],$sender['guid_sig']);
+
+	$r = q("select * from xchan where xchan_hash = '%s' limit 1",
+		dbesc($newhash)
+	);
+
+	$newxchan = $r[0];
+
+	xchan_change_key($xchan,$newxchan,$data);
+
+	$ret['success'] = true;
+	json_return_and_die($ret);
+}
+
 
 function zotinfo($arr) {
 
-- 
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