public inbox for development@lists.ipfire.org
 help / color / mirror / Atom feed
* [PATCH] OpenSSL: remove ciphers without Forward Secrecy from default ciphersuite
@ 2020-08-01 12:13 Peter Müller
  2020-08-04  9:35 ` Michael Tremer
  0 siblings, 1 reply; 2+ messages in thread
From: Peter Müller @ 2020-08-01 12:13 UTC (permalink / raw)
  To: development

[-- Attachment #1: Type: text/plain, Size: 4237 bytes --]

Ciphers not supplying (Perfect) Forward Secrecy are considered dangerous
since they allow content decryption in retrospect, if an attacker is
able to gain access to the servers' private key used for the
corresponding TLS session.

Since IPFire machines establish very few TLS connections by themselves, and
destinations (IPFire.org infrastructure, mirrors, IPS rule sources, etc.)
provide support for Forward Secrecy ciphers - some are even enforcing
them -, it is safe to drop support for anything else.

This patch reduces the OpenSSL default cipher list to:
TLS_AES_256_GCM_SHA384  TLSv1.3 Kx=any      Au=any  Enc=AESGCM(256) Mac=AEAD
TLS_CHACHA20_POLY1305_SHA256 TLSv1.3 Kx=any      Au=any  Enc=CHACHA20/POLY1305(256) Mac=AEAD
TLS_AES_128_GCM_SHA256  TLSv1.3 Kx=any      Au=any  Enc=AESGCM(128) Mac=AEAD
ECDHE-ECDSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH     Au=ECDSA Enc=AESGCM(256) Mac=AEAD
ECDHE-ECDSA-CHACHA20-POLY1305 TLSv1.2 Kx=ECDH     Au=ECDSA Enc=CHACHA20/POLY1305(256) Mac=AEAD
ECDHE-ECDSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH     Au=ECDSA Enc=AESGCM(128) Mac=AEAD
ECDHE-RSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH     Au=RSA  Enc=AESGCM(256) Mac=AEAD
ECDHE-RSA-CHACHA20-POLY1305 TLSv1.2 Kx=ECDH     Au=RSA  Enc=CHACHA20/POLY1305(256) Mac=AEAD
ECDHE-RSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH     Au=RSA  Enc=AESGCM(128) Mac=AEAD
ECDHE-ECDSA-AES256-SHA384 TLSv1.2 Kx=ECDH     Au=ECDSA Enc=AES(256)  Mac=SHA384
ECDHE-ECDSA-CAMELLIA256-SHA384 TLSv1.2 Kx=ECDH     Au=ECDSA Enc=Camellia(256) Mac=SHA384
ECDHE-RSA-AES256-SHA384 TLSv1.2 Kx=ECDH     Au=RSA  Enc=AES(256)  Mac=SHA384
ECDHE-RSA-CAMELLIA256-SHA384 TLSv1.2 Kx=ECDH     Au=RSA  Enc=Camellia(256) Mac=SHA384
ECDHE-ECDSA-AES128-SHA256 TLSv1.2 Kx=ECDH     Au=ECDSA Enc=AES(128)  Mac=SHA256
ECDHE-ECDSA-CAMELLIA128-SHA256 TLSv1.2 Kx=ECDH     Au=ECDSA Enc=Camellia(128) Mac=SHA256
ECDHE-RSA-AES128-SHA256 TLSv1.2 Kx=ECDH     Au=RSA  Enc=AES(128)  Mac=SHA256
ECDHE-RSA-CAMELLIA128-SHA256 TLSv1.2 Kx=ECDH     Au=RSA  Enc=Camellia(128) Mac=SHA256
DHE-RSA-AES256-GCM-SHA384 TLSv1.2 Kx=DH       Au=RSA  Enc=AESGCM(256) Mac=AEAD
DHE-RSA-CHACHA20-POLY1305 TLSv1.2 Kx=DH       Au=RSA  Enc=CHACHA20/POLY1305(256) Mac=AEAD
DHE-RSA-AES128-GCM-SHA256 TLSv1.2 Kx=DH       Au=RSA  Enc=AESGCM(128) Mac=AEAD
DHE-RSA-AES256-SHA256   TLSv1.2 Kx=DH       Au=RSA  Enc=AES(256)  Mac=SHA256
DHE-RSA-CAMELLIA256-SHA256 TLSv1.2 Kx=DH       Au=RSA  Enc=Camellia(256) Mac=SHA256
DHE-RSA-AES128-SHA256   TLSv1.2 Kx=DH       Au=RSA  Enc=AES(128)  Mac=SHA256
DHE-RSA-CAMELLIA128-SHA256 TLSv1.2 Kx=DH       Au=RSA  Enc=Camellia(128) Mac=SHA256
ECDHE-ECDSA-AES256-SHA  TLSv1 Kx=ECDH     Au=ECDSA Enc=AES(256)  Mac=SHA1
ECDHE-ECDSA-AES128-SHA  TLSv1 Kx=ECDH     Au=ECDSA Enc=AES(128)  Mac=SHA1
ECDHE-RSA-AES256-SHA    TLSv1 Kx=ECDH     Au=RSA  Enc=AES(256)  Mac=SHA1
ECDHE-RSA-AES128-SHA    TLSv1 Kx=ECDH     Au=RSA  Enc=AES(128)  Mac=SHA1
DHE-RSA-AES256-SHA      SSLv3 Kx=DH       Au=RSA  Enc=AES(256)  Mac=SHA1
DHE-RSA-CAMELLIA256-SHA SSLv3 Kx=DH       Au=RSA  Enc=Camellia(256) Mac=SHA1
DHE-RSA-AES128-SHA      SSLv3 Kx=DH       Au=RSA  Enc=AES(128)  Mac=SHA1
DHE-RSA-CAMELLIA128-SHA SSLv3 Kx=DH       Au=RSA  Enc=Camellia(128) Mac=SHA1

Signed-off-by: Peter Müller <peter.mueller(a)ipfire.org>
---
 src/patches/openssl-1.1.1d-default-cipherlist.patch | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/patches/openssl-1.1.1d-default-cipherlist.patch b/src/patches/openssl-1.1.1d-default-cipherlist.patch
index 5ad7829e7..a3a48933e 100644
--- a/src/patches/openssl-1.1.1d-default-cipherlist.patch
+++ b/src/patches/openssl-1.1.1d-default-cipherlist.patch
@@ -5,7 +5,7 @@
   * This applies to ciphersuites for TLSv1.2 and below.
   */
 -# define SSL_DEFAULT_CIPHER_LIST "ALL:!COMPLEMENTOFDEFAULT:!eNULL"
-+# define SSL_DEFAULT_CIPHER_LIST "HIGH:+aRSA:+SHA384:+SHA256:+DH:+SHA:+kRSA:!eNULL:!aNULL:!PSK:!SRP:!AESCCM:!DSS"
++# define SSL_DEFAULT_CIPHER_LIST "HIGH:+aRSA:+SHA384:+SHA256:+DH:+SHA:!kRSA:!eNULL:!aNULL:!PSK:!SRP:!AESCCM:!DSS"
  /* This is the default set of TLSv1.3 ciphersuites */
  # if !defined(OPENSSL_NO_CHACHA) && !defined(OPENSSL_NO_POLY1305)
  #  define TLS_DEFAULT_CIPHERSUITES "TLS_AES_256_GCM_SHA384:" \
-- 
2.26.2

^ permalink raw reply	[flat|nested] 2+ messages in thread
end of thread, other threads:[~2020-08-04  9:35 UTC | newest]

Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-08-01 12:13 [PATCH] OpenSSL: remove ciphers without Forward Secrecy from default ciphersuite Peter Müller
2020-08-04  9:35 ` Michael Tremer

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox