In case it helps, here are the results of testssl.sh:
jervin@MiniUntu:~/testssl/testssl.sh$ ./testssl.sh kumo.kites.org:993
###########################################################
testssl.sh 3.0rc5 from https://testssl.sh/dev/
(35c69be 2019-10-02 17:53:37 -- )
This program is free software. Distribution and
modification under GPLv2 permitted.
USAGE w/o ANY WARRANTY. USE IT AT YOUR OWN RISK!
Please file bugs @ https://testssl.sh/bugs/
###########################################################
Using "OpenSSL 1.0.2-chacha (1.0.2k-dev)" [~183 ciphers]
on MiniUntu:./bin/openssl.Linux.x86_64
(built: "Jan 18 17:12:17 2019", platform: "linux-x86_64")
Start 2019-10-11 07:28:20 -->> 3.222.54.62:993 (kumo.kites.org)
<<--
rDNS (3.222.54.62): kumo.kites.org.
Service detected: IMAP, thus skipping HTTP specific checks
Testing protocols via sockets except NPN+ALPN
SSLv2 not offered (OK)
SSLv3 not offered (OK)
TLS 1 offered (deprecated)
TLS 1.1 offered (deprecated)
TLS 1.2 offered (OK)
TLS 1.3 offered (OK): final
NPN/SPDY not offered
ALPN/HTTP2 not offered
Testing cipher categories
NULL ciphers (no encryption) not offered (OK)
Anonymous NULL Ciphers (no authentication) not offered (OK)
Export ciphers (w/o ADH+NULL) not offered (OK)
LOW: 64 Bit + DES, RC[2,4] (w/o export) not offered (OK)
Triple DES Ciphers / IDEA not offered (OK)
Average: SEED + 128+256 Bit CBC ciphers offered
Strong encryption (AEAD ciphers) offered (OK)
Testing robust (perfect) forward secrecy, (P)FS -- omitting Null
Authentication/Encryption, 3DES, RC4
PFS is offered (OK) TLS_AES_256_GCM_SHA384
TLS_CHACHA20_POLY1305_SHA256
ECDHE-RSA-AES256-GCM-SHA384
ECDHE-RSA-AES256-SHA384 ECDHE-RSA-AES256-SHA
DHE-RSA-AES256-GCM-SHA384
ECDHE-RSA-CHACHA20-POLY1305
DHE-RSA-CHACHA20-POLY1305
DHE-RSA-AES256-CCM8 DHE-RSA-AES256-CCM
DHE-RSA-AES256-SHA256 DHE-RSA-AES256-SHA
ECDHE-RSA-CAMELLIA256-SHA384
DHE-RSA-CAMELLIA256-SHA256
DHE-RSA-CAMELLIA256-SHA
DHE-RSA-ARIA256-GCM-SHA384
ECDHE-ARIA256-GCM-SHA384
TLS_AES_128_GCM_SHA256
ECDHE-RSA-AES128-GCM-SHA256
ECDHE-RSA-AES128-SHA256
ECDHE-RSA-AES128-SHA DHE-RSA-AES128-GCM-SHA256
DHE-RSA-AES128-CCM8 DHE-RSA-AES128-CCM
DHE-RSA-AES128-SHA256
DHE-RSA-AES128-SHA
ECDHE-RSA-CAMELLIA128-SHA256
DHE-RSA-CAMELLIA128-SHA256
DHE-RSA-SEED-SHA DHE-RSA-CAMELLIA128-SHA
DHE-RSA-ARIA128-GCM-SHA256
ECDHE-ARIA128-GCM-SHA256
Elliptic curves offered: secp384r1
DH group offered: Unknown DH group (1024 bits)
Testing server preferences
Has server cipher order? yes (OK) -- only for < TLS 1.3
Negotiated protocol TLSv1.3
Negotiated cipher TLS_AES_256_GCM_SHA384, 384 bit ECDH (P-384)
Cipher order
TLSv1: ECDHE-RSA-AES256-SHA DHE-RSA-AES256-SHA
DHE-RSA-CAMELLIA256-SHA AES256-SHA
CAMELLIA256-SHA ECDHE-RSA-AES128-SHA DHE-RSA-AES128-SHA
DHE-RSA-SEED-SHA
DHE-RSA-CAMELLIA128-SHA AES128-SHA SEED-SHA CAMELLIA128-SHA
TLSv1.1: ECDHE-RSA-AES256-SHA DHE-RSA-AES256-SHA
DHE-RSA-CAMELLIA256-SHA AES256-SHA
CAMELLIA256-SHA ECDHE-RSA-AES128-SHA DHE-RSA-AES128-SHA
DHE-RSA-SEED-SHA
DHE-RSA-CAMELLIA128-SHA AES128-SHA SEED-SHA CAMELLIA128-SHA
TLSv1.2: ECDHE-RSA-AES256-GCM-SHA384 ECDHE-RSA-AES256-SHA384
ECDHE-RSA-AES256-SHA
DHE-RSA-AES256-GCM-SHA384 ECDHE-RSA-CHACHA20-POLY1305
DHE-RSA-CHACHA20-POLY1305
DHE-RSA-AES256-CCM8 DHE-RSA-AES256-CCM
DHE-RSA-AES256-SHA256 DHE-RSA-AES256-SHA
ECDHE-RSA-CAMELLIA256-SHA384 DHE-RSA-CAMELLIA256-SHA256
DHE-RSA-CAMELLIA256-SHA
AES256-GCM-SHA384 AES256-CCM8 AES256-CCM AES256-SHA256
AES256-SHA CAMELLIA256-SHA256
CAMELLIA256-SHA ARIA256-GCM-SHA384
DHE-RSA-ARIA256-GCM-SHA384 ECDHE-ARIA256-GCM-SHA384
ECDHE-RSA-AES128-GCM-SHA256 ECDHE-RSA-AES128-SHA256
ECDHE-RSA-AES128-SHA
DHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES128-CCM8
DHE-RSA-AES128-CCM AES128-CCM8 AES128-CCM
DHE-RSA-AES128-SHA256 DHE-RSA-AES128-SHA
ECDHE-RSA-CAMELLIA128-SHA256
DHE-RSA-CAMELLIA128-SHA256 DHE-RSA-SEED-SHA
DHE-RSA-CAMELLIA128-SHA AES128-GCM-SHA256
AES128-SHA256 AES128-SHA CAMELLIA128-SHA256 SEED-SHA
CAMELLIA128-SHA ARIA128-GCM-SHA256
DHE-RSA-ARIA128-GCM-SHA256 ECDHE-ARIA128-GCM-SHA256
TLSv1.3: TLS_AES_256_GCM_SHA384 TLS_CHACHA20_POLY1305_SHA256
TLS_AES_128_GCM_SHA256
Testing server defaults (Server Hello)
TLS extensions (standard) "renegotiation info/#65281" "server
name/#0" "EC point formats/#11"
"session ticket/#35" "supported
versions/#43" "key share/#51"
"max fragment length/#1"
"encrypt-then-mac/#22"
"extended master secret/#23"
Session Ticket RFC 5077 hint 7200 seconds, session tickets keys seems
to be rotated < daily
SSL Session ID support yes
Session Resumption Tickets no, ID: no
TLS clock skew Random values, no fingerprinting possible
Signature Algorithm SHA256 with RSA
Server key size RSA 2048 bits
Server key usage Digital Signature, Key Encipherment
Server extended key usage TLS Web Server Authentication, TLS Web
Client Authentication
Serial / Fingerprints F451FC38110BD0CC08D03E6975C05AC0 / SHA1
5EB402C1FB4020C1697E48931F68D11145D48F43
SHA256
C37816C37E38DAEF4758EC41EA9F332C08C9310CA63976BD5A294EE7D84B3CF0
Common Name (CN) kumo.kites.org
subjectAltName (SAN) kumo.kites.org www.kumo.kites.org
Issuer Sectigo RSA Domain Validation Secure
Server CA (Sectigo Limited from GB)
Trust (hostname) Ok via SAN and CN (same w/o SNI)
Chain of trust Ok
EV cert (experimental) no
ETS/"eTLS", visibility info not present
Certificate Validity (UTC) 364 >= 60 days (2019-10-10 20:00 -->
2020-10-09 19:59)
# of certificates provided 6 (certificate list ordering problem)
Certificate Revocation List --
OCSP URI http://ocsp.sectigo.com
OCSP stapling not offered
OCSP must staple extension --
DNS CAA RR (experimental) not offered
Certificate Transparency yes (certificate extension)
Testing vulnerabilities
Heartbleed (CVE-2014-0160) not vulnerable (OK), no
heartbeat extension
CCS (CVE-2014-0224) not vulnerable (OK)
Ticketbleed (CVE-2016-9244), experiment. -- (applicable only for HTTPS)
ROBOT not vulnerable (OK)
Secure Renegotiation (RFC 5746) supported (OK)
Secure Client-Initiated Renegotiation not vulnerable (OK)
CRIME, TLS (CVE-2012-4929) not vulnerable (OK) (not
using HTTP anyway)
POODLE, SSL (CVE-2014-3566) not vulnerable (OK)
TLS_FALLBACK_SCSV (RFC 7507) Downgrade attack prevention
supported (OK)
SWEET32 (CVE-2016-2183, CVE-2016-6329) not vulnerable (OK)
FREAK (CVE-2015-0204) not vulnerable (OK)
DROWN (CVE-2016-0800, CVE-2016-0703) not vulnerable on this host
and port (OK)
make sure you don't use this
certificate elsewhere with SSLv2 enabled services
https://censys.io/ipv4?q=C37816C37E38DAEF4758EC41EA9F332C08C9310CA63976BD5A294EE7D84B3CF0
could help you to find out
LOGJAM (CVE-2015-4000), experimental not vulnerable (OK): no DH
EXPORT ciphers
But: Unknown DH group (1024
bits)
BEAST (CVE-2011-3389) TLS1: ECDHE-RSA-AES256-SHA
DHE-RSA-AES256-SHA
DHE-RSA-CAMELLIA256-SHA AES256-SHA CAMELLIA256-SHA
ECDHE-RSA-AES128-SHA DHE-RSA-AES128-SHA
DHE-RSA-SEED-SHA DHE-RSA-CAMELLIA128-SHA AES128-SHA
SEED-SHA CAMELLIA128-SHA
VULNERABLE -- but also
supports higher protocols TLSv1.1 TLSv1.2 (likely mitigated)
LUCKY13 (CVE-2013-0169), experimental potentially VULNERABLE, uses
cipher block chaining (CBC) ciphers with TLS. Check patches
RC4 (CVE-2013-2566, CVE-2015-2808) no RC4 ciphers detected (OK)
Testing 370 ciphers via OpenSSL plus sockets against the server,
ordered by encryption strength
Hexcode Cipher Suite Name (OpenSSL) KeyExch. Encryption Bits
Cipher Suite Name (IANA/RFC)
-----------------------------------------------------------------------------------------------------------------------------
[redacted to reduce size]
Running client simulations via sockets
Android 8.1 (native) TLSv1.2 ECDHE-RSA-AES128-GCM-SHA256, 384
bit ECDH (P-384)
Android 9.0 (native) TLSv1.3 TLS_AES_128_GCM_SHA256, 384 bit
ECDH (P-384)
Java 6u45 TLSv1.0 AES128-SHA, No FS
Java 7u25 TLSv1.0 ECDHE-RSA-AES128-SHA, 384 bit
ECDH (P-384)
Java 8u161 TLSv1.2 ECDHE-RSA-AES256-SHA384, 384 bit
ECDH (P-384)
Java 11.0.2 (OpenJDK) TLSv1.3 TLS_AES_128_GCM_SHA256, 384 bit
ECDH (P-384)
Java 12.0.1 (OpenJDK) TLSv1.3 TLS_AES_128_GCM_SHA256, 384 bit
ECDH (P-384)
OpenSSL 1.0.1l TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384, 384
bit ECDH (P-384)
OpenSSL 1.0.2e TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384, 384
bit ECDH (P-384)
OpenSSL 1.1.0j (Debian) TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384, 384
bit ECDH (P-384)
OpenSSL 1.1.1b (Debian) TLSv1.3 TLS_AES_256_GCM_SHA384, 384 bit
ECDH (P-384)
Thunderbird (60.6) TLSv1.3 TLS_AES_128_GCM_SHA256, 384 bit
ECDH (P-384)
Done 2019-10-11 07:31:08 [ 170s] -->> 3.222.54.62:993 (kumo.kites.org)
<<--
On 10/11/19 7:22 AM, C. James Ervin via dovecot wrote:
In setting up my new mail server, I am getting the following in the logs:
Oct 11 07:10:59 kumo dovecot[5704]: imap-login: Disconnected (no auth
attempts in 0 secs): user=<>, rip=24.53.79.10, lip=172.26.12.90, *TLS
handshaking: SSL_accept() syscall failed: Success*,
session=<B9OokqCUD+UYNU8K>
