Open Thomas2500 opened 6 days ago
With the change of tls_medium_cipherlist, the number of available ciphers for TLSv1.2 will be reduced from 59 to 9 (as per testssl.sh results). The smtpd_tls_mandatory_ciphers setting will be updated to 'medium' to accommodate the new custom list.
tls_medium_cipherlist
smtpd_tls_mandatory_ciphers
The cipher list will change as follows:
Current Cipher List:
TLSv1.2 (server order) xc02c ECDHE-ECDSA-AES256-GCM-SHA384 ECDH 253 AESGCM 256 TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 xc030 ECDHE-RSA-AES256-GCM-SHA384 ECDH 253 AESGCM 256 TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 x9f DHE-RSA-AES256-GCM-SHA384 DH 4096 AESGCM 256 TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 xcca9 ECDHE-ECDSA-CHACHA20-POLY1305 ECDH 253 ChaCha20 256 TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256 xcca8 ECDHE-RSA-CHACHA20-POLY1305 ECDH 253 ChaCha20 256 TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 xccaa DHE-RSA-CHACHA20-POLY1305 DH 4096 ChaCha20 256 TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256 xc0af ECDHE-ECDSA-AES256-CCM8 ECDH 253 AESCCM8 256 TLS_ECDHE_ECDSA_WITH_AES_256_CCM_8 xc0ad ECDHE-ECDSA-AES256-CCM ECDH 253 AESCCM 256 TLS_ECDHE_ECDSA_WITH_AES_256_CCM xc0a3 DHE-RSA-AES256-CCM8 DH 4096 AESCCM8 256 TLS_DHE_RSA_WITH_AES_256_CCM_8 xc09f DHE-RSA-AES256-CCM DH 4096 AESCCM 256 TLS_DHE_RSA_WITH_AES_256_CCM xc05d ECDHE-ECDSA-ARIA256-GCM-SHA384 ECDH 253 ARIAGCM 256 TLS_ECDHE_ECDSA_WITH_ARIA_256_GCM_SHA384 xc061 ECDHE-ARIA256-GCM-SHA384 ECDH 253 ARIAGCM 256 TLS_ECDHE_RSA_WITH_ARIA_256_GCM_SHA384 xc053 DHE-RSA-ARIA256-GCM-SHA384 DH 4096 ARIAGCM 256 TLS_DHE_RSA_WITH_ARIA_256_GCM_SHA384 xc024 ECDHE-ECDSA-AES256-SHA384 ECDH 253 AES 256 TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384 xc028 ECDHE-RSA-AES256-SHA384 ECDH 253 AES 256 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 x6b DHE-RSA-AES256-SHA256 DH 4096 AES 256 TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 xc073 ECDHE-ECDSA-CAMELLIA256-SHA384 ECDH 253 Camellia 256 TLS_ECDHE_ECDSA_WITH_CAMELLIA_256_CBC_SHA384 xc077 ECDHE-RSA-CAMELLIA256-SHA384 ECDH 253 Camellia 256 TLS_ECDHE_RSA_WITH_CAMELLIA_256_CBC_SHA384 xc4 DHE-RSA-CAMELLIA256-SHA256 DH 4096 Camellia 256 TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA256 xc00a ECDHE-ECDSA-AES256-SHA ECDH 253 AES 256 TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA xc014 ECDHE-RSA-AES256-SHA ECDH 253 AES 256 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA x39 DHE-RSA-AES256-SHA DH 4096 AES 256 TLS_DHE_RSA_WITH_AES_256_CBC_SHA x88 DHE-RSA-CAMELLIA256-SHA DH 4096 Camellia 256 TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA x9d AES256-GCM-SHA384 RSA AESGCM 256 TLS_RSA_WITH_AES_256_GCM_SHA384 xc0a1 AES256-CCM8 RSA AESCCM8 256 TLS_RSA_WITH_AES_256_CCM_8 xc09d AES256-CCM RSA AESCCM 256 TLS_RSA_WITH_AES_256_CCM xc051 ARIA256-GCM-SHA384 RSA ARIAGCM 256 TLS_RSA_WITH_ARIA_256_GCM_SHA384 x3d AES256-SHA256 RSA AES 256 TLS_RSA_WITH_AES_256_CBC_SHA256 xc0 CAMELLIA256-SHA256 RSA Camellia 256 TLS_RSA_WITH_CAMELLIA_256_CBC_SHA256 x35 AES256-SHA RSA AES 256 TLS_RSA_WITH_AES_256_CBC_SHA x84 CAMELLIA256-SHA RSA Camellia 256 TLS_RSA_WITH_CAMELLIA_256_CBC_SHA xc02b ECDHE-ECDSA-AES128-GCM-SHA256 ECDH 253 AESGCM 128 TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 xc02f ECDHE-RSA-AES128-GCM-SHA256 ECDH 253 AESGCM 128 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 x9e DHE-RSA-AES128-GCM-SHA256 DH 4096 AESGCM 128 TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 xc0ae ECDHE-ECDSA-AES128-CCM8 ECDH 253 AESCCM8 128 TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8 xc0ac ECDHE-ECDSA-AES128-CCM ECDH 253 AESCCM 128 TLS_ECDHE_ECDSA_WITH_AES_128_CCM xc0a2 DHE-RSA-AES128-CCM8 DH 4096 AESCCM8 128 TLS_DHE_RSA_WITH_AES_128_CCM_8 xc09e DHE-RSA-AES128-CCM DH 4096 AESCCM 128 TLS_DHE_RSA_WITH_AES_128_CCM xc05c ECDHE-ECDSA-ARIA128-GCM-SHA256 ECDH 253 ARIAGCM 128 TLS_ECDHE_ECDSA_WITH_ARIA_128_GCM_SHA256 xc060 ECDHE-ARIA128-GCM-SHA256 ECDH 253 ARIAGCM 128 TLS_ECDHE_RSA_WITH_ARIA_128_GCM_SHA256 xc052 DHE-RSA-ARIA128-GCM-SHA256 DH 4096 ARIAGCM 128 TLS_DHE_RSA_WITH_ARIA_128_GCM_SHA256 xc023 ECDHE-ECDSA-AES128-SHA256 ECDH 253 AES 128 TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 xc027 ECDHE-RSA-AES128-SHA256 ECDH 253 AES 128 TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 x67 DHE-RSA-AES128-SHA256 DH 4096 AES 128 TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 xc072 ECDHE-ECDSA-CAMELLIA128-SHA256 ECDH 253 Camellia 128 TLS_ECDHE_ECDSA_WITH_CAMELLIA_128_CBC_SHA256 xc076 ECDHE-RSA-CAMELLIA128-SHA256 ECDH 253 Camellia 128 TLS_ECDHE_RSA_WITH_CAMELLIA_128_CBC_SHA256 xbe DHE-RSA-CAMELLIA128-SHA256 DH 4096 Camellia 128 TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA256 xc009 ECDHE-ECDSA-AES128-SHA ECDH 253 AES 128 TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA xc013 ECDHE-RSA-AES128-SHA ECDH 253 AES 128 TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA x33 DHE-RSA-AES128-SHA DH 4096 AES 128 TLS_DHE_RSA_WITH_AES_128_CBC_SHA x45 DHE-RSA-CAMELLIA128-SHA DH 4096 Camellia 128 TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA x9c AES128-GCM-SHA256 RSA AESGCM 128 TLS_RSA_WITH_AES_128_GCM_SHA256 xc0a0 AES128-CCM8 RSA AESCCM8 128 TLS_RSA_WITH_AES_128_CCM_8 xc09c AES128-CCM RSA AESCCM 128 TLS_RSA_WITH_AES_128_CCM xc050 ARIA128-GCM-SHA256 RSA ARIAGCM 128 TLS_RSA_WITH_ARIA_128_GCM_SHA256 x3c AES128-SHA256 RSA AES 128 TLS_RSA_WITH_AES_128_CBC_SHA256 xba CAMELLIA128-SHA256 RSA Camellia 128 TLS_RSA_WITH_CAMELLIA_128_CBC_SHA256 x2f AES128-SHA RSA AES 128 TLS_RSA_WITH_AES_128_CBC_SHA x41 CAMELLIA128-SHA RSA Camellia 128 TLS_RSA_WITH_CAMELLIA_128_CBC_SHA TLSv1.3 (server order) x1302 TLS_AES_256_GCM_SHA384 ECDH 253 AESGCM 256 TLS_AES_256_GCM_SHA384 x1303 TLS_CHACHA20_POLY1305_SHA256 ECDH 253 ChaCha20 256 TLS_CHACHA20_POLY1305_SHA256 x1301 TLS_AES_128_GCM_SHA256 ECDH 253 AESGCM 128 TLS_AES_128_GCM_SHA256
New Cipher List:
TLSv1.2 (server order) xc02b ECDHE-ECDSA-AES128-GCM-SHA256 ECDH 253 AESGCM 128 TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 xc02f ECDHE-RSA-AES128-GCM-SHA256 ECDH 253 AESGCM 128 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 xc02c ECDHE-ECDSA-AES256-GCM-SHA384 ECDH 253 AESGCM 256 TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 xc030 ECDHE-RSA-AES256-GCM-SHA384 ECDH 253 AESGCM 256 TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 xcca9 ECDHE-ECDSA-CHACHA20-POLY1305 ECDH 253 ChaCha20 256 TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256 xcca8 ECDHE-RSA-CHACHA20-POLY1305 ECDH 253 ChaCha20 256 TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 x9e DHE-RSA-AES128-GCM-SHA256 DH 4096 AESGCM 128 TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 x9f DHE-RSA-AES256-GCM-SHA384 DH 4096 AESGCM 256 TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 xccaa DHE-RSA-CHACHA20-POLY1305 DH 4096 ChaCha20 256 TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256 TLSv1.3 (server order) x1302 TLS_AES_256_GCM_SHA384 ECDH 253 AESGCM 256 TLS_AES_256_GCM_SHA384 x1303 TLS_CHACHA20_POLY1305_SHA256 ECDH 253 ChaCha20 256 TLS_CHACHA20_POLY1305_SHA256 x1301 TLS_AES_128_GCM_SHA256 ECDH 253 AESGCM 128 TLS_AES_128_GCM_SHA256
Testing the change To test the changes on your system, install testssl.sh and run:
testssl -t smtp mailcow.your.tld:25
During tests on my server, only scanning bots failed to connect to the SMTP server.
With the change of
tls_medium_cipherlist, the number of available ciphers for TLSv1.2 will be reduced from 59 to 9 (as per testssl.sh results). Thesmtpd_tls_mandatory_cipherssetting will be updated to 'medium' to accommodate the new custom list.The cipher list will change as follows:
Current Cipher List:
New Cipher List:
Testing the change
To test the changes on your system, install testssl.sh and run:
During tests on my server, only scanning bots failed to connect to the SMTP server.