Benoit Tellier created JAMES-4034:
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Summary: SMTP submission: validate FROM header
Key: JAMES-4034
URL: https://issues.apache.org/jira/browse/JAMES-4034
Project: James Server
Issue Type: Improvement
Components: SMTPServer
Reporter: Benoit Tellier
h3. Why?
Prevent and limit email forgery by local users.
As a James administrator I should have a way to configure SMTP submission to
reject emails spoofing somebody else mail adress.
As of today:
- JMAP stacks controls both the transport envelope and the headers (From) as
mandated by the JMAP Mail RFC (RFC-8621)
- However SMTP only controls the transport envelop and not the headers.
This control is currently implemented into SenderAuthIdentifyVerificationHook
and is intendeed as a hook on MAIL FROM SMTP command.
We shall also enforce a control of the From header upon submission in SMTP.
Such controls would be mandatory for use of Apache James in an environment
where local users could not be fully trusted, as for instance a SaaS offer.
h3. How?
Modify SenderAuthIdentifyVerificationHook in order that it also is a
JamesMessageHook called before enqueing and checks each and every From header
the same way it checks "MAIL FROM" command.
Modifying SenderAuthIdentifyVerificationHook would enforce this only for
connected users IE mail submission and would not affect email relay. This also
ensure this behaviour will apply by default.
Refactoring of the underlying AbstractSenderAuthIdentifyVerificationHook might
be required.
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