Re: [xmpp] the stream negotiation process

[Philipp Hancke <fippo at mail.symlynx.com>]

Peter Saint-Andre wrote:
[...]
> > How else would the receiving entity know to send an error?  If I negotiate TLS 
> > and then just sit there and not negotiate SASL, the server shouldn't boot me 
> > (well except due to a timeout, but that's not the same thing as skipping over 
> > a required feature).  The server pretty much has to wait for me to make a 
> > wrong move.  Maybe you mean if I try to negotiate a stream feature out of 
> > sequence?  That would be one non-stanza way of me doing something wrong.
>
> A stanza is <iq/>, <message/>, or <presence/>. If the server is
> expecting SASL and I try to negotiate XEP-0198 support or dialback or
> whatever, I haven't sent a stanza so how can the server return a stanza
> error to me?

In the case of dialback that is rather easy now that we have dialback
errors in xep 220. The additional error conditions might be:
* policy-violation: dialback without tls when tls is required by policy
* forbidden: dialback with tls but invalid certificate

philipp