On 31.05.2021 14:42, Cyborg via Exim-users wrote:
The client did not offer a cipher you have allowed.
But it's not true (see details in my reponse to Viktor's mail).
You can do various tests to find out with openssl's s_client:
with s_client I always succeed - eg. when I use first cipher from Client
Hello
openssl s_client -connect 127.0.0.1:465 -tls1_2 -cipher
ECDHE-ECDSA-AES256-GCM-SHA384
SSL-Session:
Protocol : TLSv1.2
Cipher : ECDHE-ECDSA-AES256-GCM-SHA384
Session-ID: ...
Session-ID-ctx:
Master-Key: ...
Key-Arg : None
PSK identity: None
PSK identity hint: None
SRP username: None
Start Time: 1622470949
Timeout : 7200 (sec)
Verify return code: 0 (ok)
But - I tried to specify the curve and it failed
openssl s_client -connect 127.0.0.1:465 -tls1_2 -cipher
ECDHE-ECDSA-AES256-GCM-SHA384 -curves prime256v1
CONNECTED(00000004)
34380884168:error:14094410:SSL routines:ssl3_read_bytes:sslv3 alert
handshake failure:/usr/src/crypto/openssl/ssl/s3_pkt.c:1498:SSL alert
number 40
34380884168:error:1409E0E5:SSL routines:ssl3_write_bytes:ssl handshake
failure:/usr/src/crypto/openssl/ssl/s3_pkt.c:659:
prime256v1 = secp256r1
I checked on exim built on FreeBSD 12 (with openssl 1.1) and it works
fine - but fails on other installation with openssl 1.0.
It's a bit strange as exim advertises this curve when connecting as smtp
client - and list_curves also lists is:
openssl ecparam -list_curves | grep 256v1
prime256v1: X9.62/SECG curve over a 256 bit prime field
--
Marcin Gryszkalis, PGP 0xA5DBEEC7 http://fork.pl/gpg.txt
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