Local area connection validating identity

27-Jul-2020 13:48 by 7 Comments

Local area connection validating identity

If the initiating entity does not include the 'xml:lang' attribute in any such stanza, the receiving entity SHOULD add the 'xml:lang' attribute to the stanza when routing it to a remote server or delivering it to a connected client, where the value of the attribute MUST be the identifier for the language preferred by the initiating entity (even if the receiving entity does not support that language for human-readable XML character data it generates and sends to the initiating entity, such as in stream or stanza errors). As described under Section 8.1.5, the initiating entity MAY include the 'xml:lang' attribute in any XML stanzas it sends over the stream.

When an entity that is a party to a stream has not received any XMPP traffic from its stream peer for some period of time, the peer might appear to be silent. At the time of writing, it is RECOMMENDED that any such check be performed not more than once every 5 minutes and that, ideally, such checks will be initiated by clients rather than servers. The length of time between the use of any particular check is very much a matter of local service policy and depends strongly on the network environment and usage scenarios of a given deployment and connection type. The client might not know the XMPP identity, e.g., because the XMPP identity is assigned at a level other than the XMPP application layer (as in the Generic Security Service Application Program Interface [GSS‑API]) or is derived by the server from information provided by the client (as in some deployments of end-user certificates with the SASL EXTERNAL mechanism). For initial stream headers in client-to-server communication, the 'from' attribute is the XMPP identity of the principal controlling the client, i.e., a JID of the form . The 'id' attribute specifies a unique identifier for the stream, called a "stream ID".

For response stream headers in server-to-server communication, the receiving entity MUST include a 'to' attribute in the response stream header and MUST set its value to the domainpart specified in the 'from' attribute of the initial stream header. Security Warning: The stream ID MUST be both unpredictable and non-repeating because it can be security-critical when reused by an authentication mechanisms, as is the case for Server Dialback [XEP‑0220] For initial stream headers, the initiating entity MUST NOT include the 'id' attribute; however, if the 'id' attribute is included, the receiving entity MUST ignore it. The stream ID MUST be generated by the receiving entity when it sends a response stream header and MUST BE unique within the receiving application (normally a server). One common method for checking the TCP connection is to send a space character (U 0020) between XML stanzas, which is allowed for XML streams as described under Section 11.7; the sending of such a space character is properly called a "whitespace keepalive" (the term "whitespace ping" is often used, despite the fact that it is not a ping since no "pong" is possible). In addition, the use of multiple streams in each direction (which is a somewhat frequent deployment choice for server-to-server connectivity among large XMPP service providers) further complicates application-level checking of XMPP streams and their underlying TCP connections, because there is no necessary correlation between any given initial stream and any given response stream. Therefore, it is unnecessary to close the stream with or without an error, and it is appropriate instead to simply terminate the TCP connection. Directionality applies to the application-layer traffic sent over the TCP connection, not to the transport-layer traffic sent over the TCP connection itself.

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