[jdev] confusion with subscription states in XIMP

[Peter Beck]

Jacek Konieczny wrote:

> On Thu, Jun 17, 2004 at 02:42:04PM +0200, Peter Beck wrote:
> 
>>Hi,
>>
>>I'm confused about some difference between the Presence Subscription States 
>>described in XIMP, capture 9 
>>(http://www.jabber.org/ietf/draft-ietf-xmpp-im-22.html#substates) and the 
>>behavior of real XMPP servers.
>>For my understanding it is possible to send a 'subscribed' message to a 
>>contact, without receiving a 'subscribe' from the contact before. In other 
>>word: The user/contact relation is for example in state 'None' and changes 
>>to state 'From' with sending <presence type='subscribed' to='contact' 
>>from='user' />.
> 
> 
> This is a bug of old Jabber servers. In XMPP this is illegal.
> 
> 
>>As described in XIMP 9.2 table 1, a state change from 'None' to 'From' with 
>>'subscribed' is not possible. In other word: only after receiving a 
>>'subscribe' from the contact, the user could send a 'subscribed' to the 
>>contact.
> 
> 
> That is right. 
> 
> 
>>If yes. What are the reasons? Maybe the behavior in XIMP is founded on 
>>security concerns, but I can't expect witch.
> 
> 
> It is not good when other entity may fill your roster without any
> request from you.
That's a argument. 

Thanks
Pit