I can connect and I can send mail to dovecot using LMTP without presenting a certificate:
$ ncat pmx1.venev.name INSERT_LMTP_PORT_HERE --ssl
220 pmx1.venev.name Dovecot ready.
MAIL FROM:<r...@example.org>
250 2.1.0 OK
RCPT TO:<hri...@venev.name>
250 2.1.5 OK
DATA
354 OK
Subject: This message skipped the MTA and went straight to the MDA
.
250 2.0.0 <hri...@venev.name> kKAKEm/fXmCbwwAAdB6GMg Saved
On Sat, 2021-03-27 at 00:17 +0100, Sebastian wrote:
> What I have understand, you are able in configuration to reject
> transactions with those that doesn't present a valid certificate.
> Ergo, they can connect, but they can't do anything.
>
> -----Ursprungligt meddelande-----
> Från: dovecot-boun...@dovecot.org <dovecot-boun...@dovecot.org> För
> Hristo Venev
> Skickat: den 27 mars 2021 00:16
> Till: dovecot@dovecot.org
> Ämne: ssl_verify_client_cert=yes does not require a client certificate
> [invalid signature!]
>
> Hello,
>
> I am trying to set up LMTP over TLS. I have set ssl_verify_client_cert:
>
> protocol lmtp {
> ssl_ca = </etc/cert/mail/ca.pem
> ssl_cert = </etc/cert/mail/host.pem
> ssl_key = </etc/cert/mail/host.key
> ssl_verify_client_cert = yes
> }
>
> However, clients can still connect without presenting a valid
> certificate.
>
> In openssl_iostream_set() the flags given to SSL_set_verify() are
> SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE. For a certificate to be
> required, the SSL_VERIFY_FAIL_IF_NO_PEER_CERT flag also needs to be
> set:
>
> diff --git a/src/lib-ssl-iostream/iostream-openssl.c b/src/lib-ssl-
> iostream/iostream-openssl.c
> index 5d11526f1..d8df96398 100644
> --- a/src/lib-ssl-iostream/iostream-openssl.c
> +++ b/src/lib-ssl-iostream/iostream-openssl.c
> @@ -235,7 +235,7 @@ openssl_iostream_set(struct ssl_iostream *ssl_io,
> if (ssl_io->ctx->client_ctx)
> verify_flags = SSL_VERIFY_NONE;
> else
> - verify_flags = SSL_VERIFY_PEER |
> SSL_VERIFY_CLIENT_ONCE;
> + verify_flags = SSL_VERIFY_PEER |
> SSL_VERIFY_CLIENT_ONCE |
> +SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
> SSL_set_verify(ssl_io->ssl, verify_flags,
> openssl_iostream_verify_client_cert);
> }
>
>
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