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Difference between revisions of "XEP-Remarks/XEP-0280: Message Carbons"
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XEP-Remarks/XEP-0280: Message Carbons (view source)
Revision as of 13:09, 28 January 2021
, 13:09, 28 January 2021no edit summary
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= Client-Side Processing = | = Client-Side Processing = | ||
Carbons MUST NOT be accepted from JIDs other than the user's bare account JID | '''Carbons MUST NOT be accepted from JIDs other than the user's bare account JID''', or else: | ||
* [https://op-co.de/tmp/CVE-2017-5589.html CVE-2017-5589+ Multiple XMPP Clients User Impersonation Vulnerability] | |||
* [https://gultsch.de/dino_multiple.html CVE-2019-16235+ Multiple Vulnerabilities found in Dino] | |||
Before processing a Carbon, the client must determine whether the message was a MUC-PM or a regular chat message (this might require an IQ round-trip to the sending entity). | Before processing a Carbon, the client must determine whether the message was a MUC-PM or a regular chat message (this might require an IQ round-trip to the sending entity). | ||
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# If the forwarded message contains an <tt><x xmlns='http://jabber.org/protocol/muc'></tt> payload, it's a PM | # If the forwarded message contains an <tt><x xmlns='http://jabber.org/protocol/muc'></tt> payload, it's a PM | ||
# If the partner's bare JID is a known MUC (joined, listed in bookmarks), it's a PM | # If the partner's bare JID is a known MUC (joined, listed in bookmarks), it's a PM | ||
# If the partner's bare JID is in the roster, it's | # If the partner's bare JID is in the roster, it's '''probably''' a normal message (shakes fist at Gajim) | ||
# If still undetermined, send a <tt>disco#info</tt> IQ to the partner's bare JID and delay processing of the Carbon (yes, ewwww!) | # If still undetermined, send a <tt>disco#info</tt> IQ to the partner's bare JID and delay processing of the Carbon (yes, ewwww!) | ||
# If the <tt>disco#info</tt> response contains <tt><feature var='http://jabber.org/protocol/muc'/></tt> then it's a PM, otherwise it's a normal message. Cache the disco result for next time! | # If the <tt>disco#info</tt> response contains <tt><feature var='http://jabber.org/protocol/muc'/></tt> then it's a PM, otherwise it's a normal message. Cache the disco result for next time! | ||