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From "ASF GitHub Bot (Jira)" <j...@apache.org>
Subject [jira] [Commented] (DISPATCH-975) Policy has no provision for limiting user message size
Date Wed, 08 Apr 2020 17:35:00 GMT

    [ https://issues.apache.org/jira/browse/DISPATCH-975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17078519#comment-17078519
] 

ASF GitHub Bot commented on DISPATCH-975:
-----------------------------------------

ChugR commented on pull request #717: DISPATCH-975: Enforce max message size on message ingress
URL: https://github.com/apache/qpid-dispatch/pull/717
 
 
   MaxMessageSize may be specified globally, per vhost, or per vhost user
   group. The global setting applies to all vhosts for which maxMessageSize
   is unspecified. The vhost setting applies to all vhost user groups for
   which maxMessageSize is unspecified. The vhost user group setting
   overrides all other settings. A maxMessageSize setting of zero disables
   maxMessageSize enforcement.
   
   Links over which maxMessageSize is being enforced will advertise the
   size in the max-message-size field of the Attach frame.
   
   Qpid-dispatch ignores the max-message-size field received in
   incoming Attach frames.
   
   Message size for maxMessageSize purposes is calculated to be the
   number of AMQP octets in the Annotated Message. This includes the
   header, delivery-annotations, message-annotations, properties,
   application-properties, application-data, and footer
   sections. Administrators and users must be aware that a "message"
   consisting a single character string (the application-data) will be
   much larger over the wire after properties and annotations have been
   inserted.
   
   Max message size is enforced on message/transfer ingress only. Interior
   routers form a trusted domain where messages that have entered by one
   interior router are allowed to any destination in the system. Edge
   routers are not trusted; messages from an edge router must be checked
   again by the attached interior router before they are forwarded to the
   trusted network.
   
    * Transfer size is checked as a message enters an interior router.
   
   A message that passes an interior router size check is free to go to any
   destination on that router or any other interior or edge router.
   
    * Transfers size is checked as a message enters an edge router.
   
   A message that passes an edge router size check is free to go to any
   destination on that edge router. If the message is uplinked to an
   interior router then that interior router may apply another max message
   size check possibly using a different maximum message size setting.
   
   When a message exceeds max size then:
   
    * Disposition of rejected is returned to the sender for that delivery.
    * Copies of the message being delivered through the router network are aborted.
    * The connection to the sender is closed with condition:
   
      "amqp:connection:message-size-exceeded"
   
   Self test includes a four-router linear network with two interior and two
   edge routers. Tests try oversize and undersize messages with a variety of sender and
   receiver attachment points in that network.
   
   TODO:
   
   * No tests yet for multicast or link route.
 
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> Policy has no provision for limiting user message size
> ------------------------------------------------------
>
>                 Key: DISPATCH-975
>                 URL: https://issues.apache.org/jira/browse/DISPATCH-975
>             Project: Qpid Dispatch
>          Issue Type: Bug
>            Reporter: Charles E. Rolke
>            Assignee: Charles E. Rolke
>            Priority: Major
>




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