From: Jeremy Harris Date: Mon, 15 Jul 2019 09:53:35 +0000 (+0100) Subject: Docs: add note on unusablility of must-staple certs by clients. Bug 2350 X-Git-Tag: exim-4.93-RC0~138 X-Git-Url: https://git.exim.org/exim.git/commitdiff_plain/e41242f9612adaedadd5f3607b202f32ca086b4f Docs: add note on unusablility of must-staple certs by clients. Bug 2350 --- diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt index 5463cc1a5..37ada7514 100644 --- a/doc/doc-docbook/spec.xfpt +++ b/doc/doc-docbook/spec.xfpt @@ -28478,6 +28478,13 @@ transport provide the client with a certificate, which is passed to the server if it requests it. If the server is Exim, it will request a certificate only if &%tls_verify_hosts%& or &%tls_try_verify_hosts%& matches the client. +.new +Do not use a certificate which has the OCSP-must-staple extension, +for client use (they are usable for server use). +As TLS has no means for the client to staple before TLS 1.3 it will result +in failed connections. +.wen + If the &%tls_verify_certificates%& option is set on the &(smtp)& transport, it specifies a collection of expected server certificates. These may be