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https://issues.apache.org/jira/browse/JAMES-3832?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Karsten Otto resolved JAMES-3832.
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Resolution: Fixed
> Support TLS host name verification
> ----------------------------------
>
> Key: JAMES-3832
> URL: https://issues.apache.org/jira/browse/JAMES-3832
> Project: James Server
> Issue Type: Improvement
> Components: Remote Delivery
> Affects Versions: master
> Reporter: Karsten Otto
> Priority: Minor
> Time Spent: 2h 10m
> Remaining Estimate: 0h
>
> I recently noticed that when RemoteDelivery establishes a TLS connection, it
> does not verify the remote host name against the supplied server certificate.
> While this seems to be default in Java, it potentially allows attackers to
> fake legitimate mail servers and intercept mail traffic. Thus server admins
> might want to enable host name verification in a security sensitive
> deployment.
> Java Mail has a boolean property for this purpose,
> mail.smtps.ssl.checkserveridentity, which I can add to the RemoteDelivery
> mailet configuration. However, RemoteDelivery uses the IP address to contact
> remote servers by default. While it is possible to include IP addresses in a
> certificate, this is rarely used in practice.
> I propose to change RemoteDelivery to use host names instead of IP addresses
> for contacting remote servers, in order to support host name verification if
> needed. I do not see any disadvantages with such a change, but the
> intricacies of server lookup are complex, and I may not see the full picture.
> Any reasons why this would be a problem?
> I tested the change with SocketTLS/SMTPS, and it works nicely. I do not have
> a test setup for StartTLS, but from checking the code paths I believe it
> should work as well, except that the configuration property will likely need
> to be mail.{*}smtp{*}.ssl.checkserveridentity (not smtps) due to Java Mail
> property naming weirdness.
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