JAMES-4215 Implement SASL GSSAPI Kerberos mechanism - #3099
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quantranhong1999 merged 5 commits intoJul 27, 2026
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Kerberos GSSAPI SASL tokens can exceed SMTP's existing 8,192-byte line limit. Allow administrators to increase the SMTP command and SASL continuation line limit while preserving the existing default. Restrict configured values to between 1,000 bytes and 1 MiB to limit memory exposure.
Introduce a dedicated optional SASL Kerberos module implementing GSSAPI authentication according to RFC 4752 through the JDK SASL provider. Validate the configured service principal and keytab at startup, accept only the auth QOP, inherit auth.requireSSL, and reject Kerberos identities that cannot be mapped injectively to James usernames. Cover configuration, authorization, resource cleanup, keytab validation, and JDK GSSAPI interoperability with an embedded Kerberos KDC.
Start a memory James server backed by an embedded Kerberos KDC and load the GSSAPI mechanism through the extension factory. Cover IMAP and SMTP authentication, STARTTLS availability, exchanges without an initial response, invalid tokens, and unauthorized identities.
Document installation and configuration of the optional Kerberos extension for IMAP and SMTP. Describe service principals, keytabs, identity mapping, TLS policy, supported QOP, extension loading, and SMTP token line limits.
Contributor
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Can you provide a demo video with a potential client ? |
chibenwa
reviewed
Jul 24, 2026
chibenwa
reviewed
Jul 24, 2026
chibenwa
reviewed
Jul 24, 2026
Arsnael
approved these changes
Jul 27, 2026
Contributor
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No video in TB? |
Member
Author
I am planning this. Please wait. |
Member
Author
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Thunderbird + James + Kerberos:
demo.kerberos.Thunderbird.mp4More detail on how to demo: quantranhong1999@26e63bc |
Member
Author
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Follow-up ticket to improve Kerberos's resource cleanup upon client disconnection: linagora#5577 |
chibenwa
approved these changes
Jul 27, 2026
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