Re: [exim] "Could not negotiate a supported cipher suite" wi…

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Szerző: Viktor Dukhovni
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Címzett: exim-users
Tárgy: Re: [exim] "Could not negotiate a supported cipher suite" with 2048-bit RSA server key
On Wed, Feb 12, 2014 at 10:55:48PM +0100, Magnus Holmgren wrote:

> However, I upgraded my RSA key from a 1024-bit one to 2048 bits the other day
> because cacert.org requires at least that strong a key. Also, the certificate
> is signed by an intermediate certificate that had to be included in the
> tls_certificate file. Now TLS 1.2 doesn't work. mainlog says "Could not
> negotiate a supported cipher suite" and openssl s_client says (after sending
> the client handshake):


Your leaf certificate is signed with SHA2-512. With TLS 1.2 the
set of digest algorithms used in SSL is negotiated via extensions,
and perhaps when the client does not offer SHA2-512, the server
is unwilling to use a certificate with SHA2-512.

CAcert are really going overboard with SHA2-512, it is way stronger
than RSA-2048, which is at best 128-bits (symmetric equivalent)
strong, and the companion digest should be at best SHA2-256. In
fact SHA1 would for now be a better (more interoperable) choice as
TLS 1.0 and TLS 1.1 do not negotiate digests, and some clients
don't implement any of the SHA-2 algorithms.

Since MTAs don't use public CAs to verify certificates, unless you
have submission users (should be on port 587 not 25, and should
use a separate cert) you don't need a CA-issued certificate at all.

> Disabling TLS 1.2 with e.g. tls_require_ciphers = NORMAL:-VERS-TLS1.2 makes
> the handshake succeed.


There could perhaps be a different problem, maybe even a bug in
GnuTLS TLS 1.2 support. Still SHA2-512 stands out like a sore
thumb.

> You can connect to fw.kibibyte.se:25 and do STARTTLS if you want to see the
> certificates. The above workaround is currently in effect, however.


posttls-finger: Untrusted TLS connection established to fw.kibibyte.se[212.85.79.68]:25: TLSv1.1 with cipher DHE-RSA-AES256-SHA (256/256 bits)

Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number: 139378 (0x22072)
        Signature Algorithm: sha512WithRSAEncryption
        Issuer: O=CAcert Inc., OU=http://www.CAcert.org, CN=CAcert Class 3 Root
        Validity
            Not Before: Feb 10 21:08:42 2014 GMT
            Not After : Feb 10 21:08:42 2016 GMT
        Subject: CN=*.kibibyte.se
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
                Public-Key: (2048 bit)
                Modulus:
                    00:dd:0e:56:4d:a8:00:04:48:e6:9c:f1:ba:50:92:
                    bd:5b:08:8c:46:f4:2f:e9:9b:e8:fc:19:54:f9:41:
                    ec:bb:22:bb:6b:a5:bd:28:7f:2d:3a:f3:48:d3:fa:
                    62:7b:9d:df:8b:44:5b:3f:e2:18:d8:85:b3:e2:2a:
                    08:3e:66:4b:01:ff:e2:f0:bb:b0:04:53:20:a4:15:
                    10:74:d1:5e:b7:f8:80:ff:6b:38:81:74:97:9d:9e:
                    82:dd:c2:37:a5:c7:21:5e:01:ea:bb:44:ba:b8:d9:
                    fe:90:bd:63:71:92:7a:b1:e2:5f:44:28:f1:c4:aa:
                    74:63:87:2b:0a:c6:fc:44:27:ad:28:8f:8b:2d:ab:
                    16:d9:0f:0a:4f:9a:e6:15:69:ff:bf:d3:88:c2:14:
                    71:95:de:04:3f:1f:25:fd:a1:01:67:28:bd:09:49:
                    89:9a:57:4f:3a:8f:02:93:de:4d:65:36:18:b1:42:
                    69:1c:3f:75:9f:63:6b:bf:fd:0a:f4:33:ed:ae:c2:
                    ba:e2:f3:7c:a4:f0:1d:9b:f0:ed:b9:e7:99:da:77:
                    f4:33:41:55:2e:58:01:64:fb:00:42:8d:7c:b3:2b:
                    40:8a:52:b2:7b:7a:27:c4:b5:27:ba:f8:b6:76:c6:
                    5a:e0:a2:66:21:6f:ee:8e:17:2d:6d:42:59:2d:e3:
                    56:b5
                Exponent: 65537 (0x10001)
        X509v3 extensions:
            X509v3 Basic Constraints: critical
                CA:FALSE
            X509v3 Key Usage: critical
                Digital Signature, Key Encipherment, Key Agreement
            X509v3 Extended Key Usage: 
                TLS Web Client Authentication, TLS Web Server Authentication, Netscape Server Gated Crypto, Microsoft Server Gated Crypto
            Authority Information Access: 
                OCSP - URI:http://ocsp.cacert.org/


            X509v3 CRL Distribution Points: 


                Full Name:
                  URI:http://crl.cacert.org/class3-revoke.crl


            X509v3 Subject Alternative Name: 
                DNS:*.kibibyte.se, othername:<unsupported>
    Signature Algorithm: sha512WithRSAEncryption
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        8f:cb:b0:5d:71:26:5e:9c:b8:63:3d:10:ae:eb:64:a7:ab:ee:
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        54:bd:2e:36:77:0b:ab:b7
-----BEGIN CERTIFICATE-----
MIIE5zCCAs+gAwIBAgIDAiByMA0GCSqGSIb3DQEBDQUAMFQxFDASBgNVBAoTC0NB
Y2VydCBJbmMuMR4wHAYDVQQLExVodHRwOi8vd3d3LkNBY2VydC5vcmcxHDAaBgNV
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MaL1VL0uNncLq7c=
-----END CERTIFICATE-----


Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number: 672138 (0xa418a)
        Signature Algorithm: sha256WithRSAEncryption
        Issuer: O=Root CA, OU=http://www.cacert.org, CN=CA Cert Signing Authority/emailAddress=support@???
        Validity
            Not Before: May 23 17:48:02 2011 GMT
            Not After : May 20 17:48:02 2021 GMT
        Subject: O=CAcert Inc., OU=http://www.CAcert.org, CN=CAcert Class 3 Root
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
                Public-Key: (4096 bit)
                Modulus:
                    00:ab:49:35:11:48:7c:d2:26:7e:53:94:cf:43:a9:
                    dd:28:d7:42:2a:8b:f3:87:78:19:58:7c:0f:9e:da:
                    89:7d:e1:fb:eb:72:90:0d:74:a1:96:64:ab:9f:a0:
                    24:99:73:da:e2:55:76:c7:17:7b:f5:04:ac:46:b8:
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                    8c:25:28:a8:c5:79:09:7d:46:b9:8a:f3:e9:f3:34:
                    29:08:45:e4:1c:9f:cb:94:04:1c:81:a8:14:b3:98:
                    65:c4:43:ec:4e:82:8d:09:d1:bd:aa:5b:8d:92:d0:
                    ec:de:90:c5:7f:0a:c2:e3:eb:e6:31:5a:5e:74:3e:
                    97:33:59:e8:c3:03:3d:60:33:bf:f7:d1:6f:47:c4:
                    cd:ee:62:83:52:6e:2e:08:9a:a4:d9:15:18:91:a6:
                    85:92:47:b0:ae:48:eb:6d:b7:21:ec:85:1a:68:72:
                    35:ab:ff:f0:10:5d:c0:f4:94:a7:6a:d5:3b:92:7e:
                    4c:90:05:7e:93:c1:2c:8b:a4:8e:62:74:15:71:6e:
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                    2b:eb:5a:72:25:f9:39:46:e3:72:1b:3e:04:c3:64:
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                    99:71:9a:a6:77:8b:34:60:d1:14:b4:2c:ac:9d:af:
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                    74:1e:8a:e3:f8:dc:d2:6f:98:9c:cb:47:98:95:40:
                    05:fb:e9
                Exponent: 65537 (0x10001)
        X509v3 extensions:
            X509v3 Subject Key Identifier: 
                75:A8:71:60:4C:88:13:F0:78:D9:89:77:B5:6D:C5:89:DF:BC:B1:7A
            X509v3 Authority Key Identifier: 
                keyid:16:B5:32:1B:D4:C7:F3:E0:E6:8E:F3:BD:D2:B0:3A:EE:B2:39:18:D1
                DirName:/O=Root CA/OU=http://www.cacert.org/CN=CA Cert Signing Authority/emailAddress=support@???
                serial:00


            X509v3 Basic Constraints: critical
                CA:TRUE
            Authority Information Access: 
                OCSP - URI:http://ocsp.CAcert.org/
                CA Issuers - URI:http://www.CAcert.org/ca.crt


            X509v3 Certificate Policies: 
                Policy: 1.3.6.1.4.1.18506
                  CPS: http://www.CAcert.org/index.php?id=10


            Netscape CA Policy Url: 
                http://www.CAcert.org/index.php?id=10
            Netscape Comment: 
                To get your own certificate for FREE, go to http://www.CAcert.org
    Signature Algorithm: sha256WithRSAEncryption
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        37:98:c4:be:96:a3:b7:8a
-----BEGIN CERTIFICATE-----
MIIHWTCCBUGgAwIBAgIDCkGKMA0GCSqGSIb3DQEBCwUAMHkxEDAOBgNVBAoTB1Jv
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-----END CERTIFICATE-----