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Status of This Memo This document is not an Internet Standards Track specification; it is published for informational purposes. It represents the consensus of the IETF community. All rights reserved.
Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Security Considerations.
Cbats Considerations. Normative References. Informative References. Introduction The Conference Event Package [ RFC ] defines means for a SIP User Agent UA to obtain information about the state of the conference, the types of media that are being used, the and state of current participants, additional sources of information e.
This specification adds the "grouptextchat" value to this "URI Purposes" sub-registry. The new value allows conference mixers or focus agents to advertise a multi-user chat location i. Ivov Informational [ 2] RFC Entry Purpose: GroupTextChat January The actual URI carried by the entry with the "grouptextchat" purpose can be of any type as long as the content that it points to allows for instant text communication between participants of the conference.
A conference mixer or focus agent can mimic these settings within the conference call, actually muting, kicking out, or banning participants on the call as these actions occur in the chat room. Such an approach requires no additional specification and is purely an implementation decision for the conferencing software. Also, in some cases, servers could potentially advertise more than a single chat room for a specific conference.
When this happens, clients supporting the "grouptextchat" purpose could either present the user with a choice of ing individual chats or simply opening all of them simultaneously. Either way, there is to be no expectation about any content synchronization between chat rooms.
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If synchronization exists, Wife wants nsa Somersville behavior would be entirely implementation specific. Security Considerations Advertising group text chats over SIP could provide malicious entities with the following attack vector: if a malicious entity is capable of intercepting and modifying conference package event notifications, it could trick participants into ing a third-party chat room where the attacker could eavesdrop on the conversation and potentially even impersonate some of the participants.
When none of these are text chats, clients need to clearly display the address of the destination chat room before and after it has been ed so that users can notice possible discrepancies. As an example, let's consider a situation in which an attacker tricks participants into ing a conference chat at xmpp:attack evil.
In the absence of any SIP-layer security, displaying the full URI of the target chat room to the user would be the only way of actually detecting the problem. Obviously, relying on human-performed string comparison is a rather meek form of protection.
Therefore, client developers are encouraged to implement additional checks that would allow users to request via configuration that a target chat room satisfy some basic criteria, such as: o target chat rooms belong to the same domain as the conference service that is advertising them. Once again, these conditions are only satisfied if the corresponding deployment conventions have been followed and they cannot be universally required by clients.
Therefore, they are suggested configuration options.
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An additional security consideration might be the possibility for using a large-scale conference as leverage to perform a flooding attack on a chat room. In cases where such a constraint could be considered to have a negative impact on usability and where automatic s are seen as important, clients may still perform the s but only when cats can confirm a relationship between the room and the conference e. Furthermore, an attack on an auxiliary chat text chats might be easier or harder than an attack on the main conference chat room depending on the security policies in effect.
Once again, clients would have to make sure that users are appropriately notified about the security levels of each component of the conference and that user-specified privacy restrictions are applied to all of them. References 4.