Hi,
I have noticed the 'ssl_cipher_list' directive in the 1.0-test snapshots which is not in 0.99. It's default value seems to be "all:!low". However, this would not be compatible with openssl's cipher listing format. Thus, I would vote to change it's format to be openssl compatible. To be compatible, it has to be changed to "ALL:!LOW" (just upercased in this case). IMO, this would be helpful because executing
openssl ciphers -v 'all:!low'
would not return any cipher, but
openssl ciphers -v 'ALL:!LOW'
would return the expected cipher list such as
ADH-AES256-SHA SSLv3 Kx=DH Au=None Enc=AES(256) Mac=SHA1 DHE-RSA-AES256-SHA SSLv3 Kx=DH Au=RSA Enc=AES(256) Mac=SHA1 DHE-DSS-AES256-SHA SSLv3 Kx=DH Au=DSS Enc=AES(256) Mac=SHA1 AES256-SHA SSLv3 Kx=RSA Au=RSA Enc=AES(256) Mac=SHA1 ADH-AES128-SHA SSLv3 Kx=DH Au=None Enc=AES(128) Mac=SHA1 DHE-RSA-AES128-SHA SSLv3 Kx=DH Au=RSA Enc=AES(128) Mac=SHA1 DHE-DSS-AES128-SHA SSLv3 Kx=DH Au=DSS Enc=AES(128) Mac=SHA1 AES128-SHA SSLv3 Kx=RSA Au=RSA Enc=AES(128) Mac=SHA1 DHE-DSS-RC4-SHA SSLv3 Kx=DH Au=DSS Enc=RC4(128) Mac=SHA1 EXP1024-DHE-DSS-RC4-SHA SSLv3 Kx=DH(1024) Au=DSS Enc=RC4(56) Mac=SHA1 export EXP1024-RC4-SHA SSLv3 Kx=RSA(1024) Au=RSA Enc=RC4(56) Mac=SHA1 export EXP1024-DHE-DSS-DES-CBC-SHA SSLv3 Kx=DH(1024) Au=DSS Enc=DES(56) Mac=SHA1 export EXP1024-DES-CBC-SHA SSLv3 Kx=RSA(1024) Au=RSA Enc=DES(56) Mac=SHA1 export EXP1024-RC2-CBC-MD5 SSLv3 Kx=RSA(1024) Au=RSA Enc=RC2(56) Mac=MD5 export EXP1024-RC4-MD5 SSLv3 Kx=RSA(1024) Au=RSA Enc=RC4(56) Mac=MD5 export EXP-KRB5-RC4-MD5 SSLv3 Kx=KRB5 Au=KRB5 Enc=RC4(40) Mac=MD5 export EXP-KRB5-RC2-CBC-MD5 SSLv3 Kx=KRB5 Au=KRB5 Enc=RC2(40) Mac=MD5 export EXP-KRB5-DES-CBC-MD5 SSLv3 Kx=KRB5 Au=KRB5 Enc=DES(40) Mac=MD5 export EXP-KRB5-RC4-SHA SSLv3 Kx=KRB5 Au=KRB5 Enc=RC4(40) Mac=SHA1 export EXP-KRB5-RC2-CBC-SHA SSLv3 Kx=KRB5 Au=KRB5 Enc=RC2(40) Mac=SHA1 export EXP-KRB5-DES-CBC-SHA SSLv3 Kx=KRB5 Au=KRB5 Enc=DES(40) Mac=SHA1 export KRB5-RC4-MD5 SSLv3 Kx=KRB5 Au=KRB5 Enc=RC4(128) Mac=MD5 KRB5-DES-CBC3-MD5 SSLv3 Kx=KRB5 Au=KRB5 Enc=3DES(168) Mac=MD5 KRB5-RC4-SHA SSLv3 Kx=KRB5 Au=KRB5 Enc=RC4(128) Mac=SHA1 KRB5-DES-CBC3-SHA SSLv3 Kx=KRB5 Au=KRB5 Enc=3DES(168) Mac=SHA1 EDH-RSA-DES-CBC3-SHA SSLv3 Kx=DH Au=RSA Enc=3DES(168) Mac=SHA1 EXP-EDH-RSA-DES-CBC-SHA SSLv3 Kx=DH(512) Au=RSA Enc=DES(40) Mac=SHA1 export EDH-DSS-DES-CBC3-SHA SSLv3 Kx=DH Au=DSS Enc=3DES(168) Mac=SHA1 EXP-EDH-DSS-DES-CBC-SHA SSLv3 Kx=DH(512) Au=DSS Enc=DES(40) Mac=SHA1 export DES-CBC3-SHA SSLv3 Kx=RSA Au=RSA Enc=3DES(168) Mac=SHA1 EXP-DES-CBC-SHA SSLv3 Kx=RSA(512) Au=RSA Enc=DES(40) Mac=SHA1 export EXP-RC2-CBC-MD5 SSLv3 Kx=RSA(512) Au=RSA Enc=RC2(40) Mac=MD5 export RC4-SHA SSLv3 Kx=RSA Au=RSA Enc=RC4(128) Mac=SHA1 RC4-MD5 SSLv3 Kx=RSA Au=RSA Enc=RC4(128) Mac=MD5 EXP-RC4-MD5 SSLv3 Kx=RSA(512) Au=RSA Enc=RC4(40) Mac=MD5 export ADH-DES-CBC3-SHA SSLv3 Kx=DH Au=None Enc=3DES(168) Mac=SHA1 EXP-ADH-DES-CBC-SHA SSLv3 Kx=DH(512) Au=None Enc=DES(40) Mac=SHA1 export ADH-RC4-MD5 SSLv3 Kx=DH Au=None Enc=RC4(128) Mac=MD5 EXP-ADH-RC4-MD5 SSLv3 Kx=DH(512) Au=None Enc=RC4(40) Mac=MD5 export DES-CBC3-MD5 SSLv2 Kx=RSA Au=RSA Enc=3DES(168) Mac=MD5 RC2-CBC-MD5 SSLv2 Kx=RSA Au=RSA Enc=RC2(128) Mac=MD5 EXP-RC2-CBC-MD5 SSLv2 Kx=RSA(512) Au=RSA Enc=RC2(40) Mac=MD5 export RC4-MD5 SSLv2 Kx=RSA Au=RSA Enc=RC4(128) Mac=MD5 EXP-RC4-MD5 SSLv2 Kx=RSA(512) Au=RSA Enc=RC4(40) Mac=MD5 export
I want dovecot to only accept high encrypted ciphers, thus it should support
ssl_cipher_list = ALL:!ADH!LOW:!SSLv2:!EXP:+HIGH:+MEDIUM
corresponding to a openssl list such as
DHE-RSA-AES256-SHA SSLv3 Kx=DH Au=RSA Enc=AES(256) Mac=SHA1 DHE-DSS-AES256-SHA SSLv3 Kx=DH Au=DSS Enc=AES(256) Mac=SHA1 AES256-SHA SSLv3 Kx=RSA Au=RSA Enc=AES(256) Mac=SHA1 KRB5-DES-CBC3-MD5 SSLv3 Kx=KRB5 Au=KRB5 Enc=3DES(168) Mac=MD5 KRB5-DES-CBC3-SHA SSLv3 Kx=KRB5 Au=KRB5 Enc=3DES(168) Mac=SHA1 EDH-RSA-DES-CBC3-SHA SSLv3 Kx=DH Au=RSA Enc=3DES(168) Mac=SHA1 EDH-DSS-DES-CBC3-SHA SSLv3 Kx=DH Au=DSS Enc=3DES(168) Mac=SHA1 DES-CBC3-SHA SSLv3 Kx=RSA Au=RSA Enc=3DES(168) Mac=SHA1 DHE-RSA-AES128-SHA SSLv3 Kx=DH Au=RSA Enc=AES(128) Mac=SHA1 DHE-DSS-AES128-SHA SSLv3 Kx=DH Au=DSS Enc=AES(128) Mac=SHA1 AES128-SHA SSLv3 Kx=RSA Au=RSA Enc=AES(128) Mac=SHA1 DHE-DSS-RC4-SHA SSLv3 Kx=DH Au=DSS Enc=RC4(128) Mac=SHA1 KRB5-RC4-MD5 SSLv3 Kx=KRB5 Au=KRB5 Enc=RC4(128) Mac=MD5 KRB5-RC4-SHA SSLv3 Kx=KRB5 Au=KRB5 Enc=RC4(128) Mac=SHA1 RC4-SHA SSLv3 Kx=RSA Au=RSA Enc=RC4(128) Mac=SHA1 RC4-MD5 SSLv3 Kx=RSA Au=RSA Enc=RC4(128) Mac=MD5
This would really make "Dovecot (...) written with security primarily in mind"
Thanks for consideration! rob.