Eric Rescorla <[email protected]> wrote:
    > id-kp-serverAuth is actually defined for "TLS WWW server
    > authentication", so ISTM that using it for an SMTP server is actually
    > already not really conforming to the Extended Key Usage requirements

This.

%openssl s_client -starttls smtp -showcerts -connect smtp.google.com:25

depth=2 C=US, O=Google Trust Services LLC, CN=GTS Root R1
verify return:1
depth=1 C=US, O=Google Trust Services, CN=WR2
verify return:1
depth=0 CN=mx.google.com
verify return:1

Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number:
            f8:bd:33:59:64:31:67:36:10:6e:a8:81:dc:d5:56:de
        Signature Algorithm: sha256WithRSAEncryption
        Issuer: C=US, O=Google Trust Services, CN=WR2
...
            X509v3 Extended Key Usage:
                TLS Web Server Authentication

I assume that *GOOGLE* will stop using *WEB* server certificates for it's SMTP.
Or, that the GOOGLE Root program, will stop including "GTS Root R1".

--
Michael Richardson <[email protected]>   . o O ( IPv6 IøT consulting )
           Sandelman Software Works Inc, Ottawa and Worldwide




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