[Standards] UPDATED: XEP-0220 (Server Dialback)
XMPP Extensions Editor
editor at xmpp.org
Tue Aug 21 16:15:39 UTC 2012
Version 0.14 of XEP-0220 (Server Dialback) has been released.
Abstract: This specification defines the Server Dialback protocol, which is used between XMPP servers to provide identity verification. Server Dialback uses the Domain Name System (DNS) as the basis for verifying identity; the basic approach is that when a receiving server accepts a server-to-server connection from an initiating server, it does not process traffic over the connection until it has verified the initiating server's key with an authoritative server for the domain asserted by the initiating server. Additionally, the protocol is used to negotitate whether the receiving server is accepting stanzas for the target domain. Although Server Dialback does not provide strong authentication and it is subject to DNS poisoning attacks, it has effectively prevented address spoofing on the XMPP network since its development in the year 2000.
Changelog: Updated the Security Considerations to describe the 'Unsolicited Dialback Attack' and added recommendations to avoid this attack. (ph)
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