> On Sep 4, 2018, at 8:52 AM, Jeremy Harris via Exim-users > <exim-users@exim.org> wrote: > > As the docs say: > > "DANE-TA usage is effectively declaring a specific CA to be used; this > might be a private CA or a public, well-known one." > > That CA needs to be known by the Exim configuration. Sorry, that's simply wrong. Exim MUST support validation via DANE-TA(2) trust-anchors that ARE NOT configured locally. Indeed Exim SHOULD ignore the local trust-anchors when validating usage DANE-TA(2) TLSA records. All that's required is that the remote server include the trust-anchor certificate in its TLS certificate message. If Exim is to claim DANE support it MUST either correctly handle non-public trust-anchors, or else MUST ignore "unusable" TLSA RRsets that contain DANE-TA(2) TLSA records. Indeed even "mixed" TLSA RRsets with some DANE-EE(3) records and some DANE-TA(2) records should probably be ignored until this issue (if not user error), because quite often only the DANE-TA(2) records are valid. My advice to the user would be to use a version of Exim that is linked with OpenSSL and NOT GnuTLS. The Exim DANE support in combination with GnuTLS is not nearly as well tested or supported. -- Viktor. -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
Re: [exim] DANE(TA) doesn't work with self signed certificates
Viktor Dukhovni via Exim-users Tue, 04 Sep 2018 07:02:21 -0700
- [exim] DANE(TA) doesn't work with self s... Michael Westerburg via Exim-users
- Re: [exim] DANE(TA) doesn't work wi... Jeremy Harris via Exim-users
- Re: [exim] DANE(TA) doesn't wor... Viktor Dukhovni via Exim-users
- Re: [exim] DANE(TA) doesn't... Jeremy Harris via Exim-users
- Re: [exim] DANE(TA) doesn't wor... Klaus Ethgen via Exim-users
- Re: [exim] DANE(TA) doesn't... Viktor Dukhovni via Exim-users
- Re: [exim] DANE(TA) doesn't work wi... Jeremy Harris via Exim-users
- Re: [exim] DANE(TA) doesn't wor... Viktor Dukhovni via Exim-users
- Re: [exim] DANE(TA) doesn't work wi... Viktor Dukhovni via Exim-users
- Re: [exim] DANE(TA) doesn't wor... Michael Westerburg via Exim-users
- Re: [exim] DANE(TA) doesn't... Viktor Dukhovni via Exim-users