É possível configurar o ECDHE-ECDSA com o mod_gnutls e o Apache 2?

Question

Estou tentando configurar minha máquina Debian com mod_gnutls implementation (para SNI), para obter os melhores resultados possíveis em TLSv1.0/1.1/1.2 (desconsiderando SSL2 e SSL3)

No entanto, parece-me que não é possível usar ECDHE-ECDSA / ECDHE-RSA em mod_gnutls , quando é possível com gnutls-cli

+ECDHE-RSA:+ECDHE-ECDSA in GnuTLSPriorities aciona o erro Syntax error parsing priorities string at ...

Minha linha de configuração atual:

GnuTLSPriorities    NONE:+SHA512:+SHA384:+SHA256:+DHE-RSA:+DHE-PSK:
                    +DHE-DSS:+AES-256-CBC:+AES-128-CBC:+3DES-CBC:+VERS-TLS1.2:
                    +VERS-TLS1.1:+VERS-TLS1.0:+COMP-NULL:+SHA1:+SIGN-ALL

Onde saída de nmap

> nmap --script ssl-enum-ciphers -p 443 www.mydomain.tld

Starting Nmap 6.47 ( http://nmap.org ) at 2014-10-27 00:55 CET
Nmap scan report for www.mydomain.tld (46.249.37.143)
Host is up (0.046s latency).
rDNS record for 46.249.37.143: lampicka.cz
PORT    STATE SERVICE
443/tcp open  https
| ssl-enum-ciphers: 
|   TLSv1.0: 
|     ciphers: 
|       TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_AES_128_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_AES_256_CBC_SHA - strong
|     compressors: 
|       NULL
|   TLSv1.1: 
|     ciphers: 
|       TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_AES_128_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_AES_256_CBC_SHA - strong
|     compressors: 
|       NULL
|   TLSv1.2: 
|     ciphers: 
|       TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_AES_128_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 - strong
|       TLS_DHE_RSA_WITH_AES_256_CBC_SHA - strong
|       TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 - strong
|     compressors: 
|       NULL

E saída de gnutls-cli , quando for dada configuração adicional +ECDHE-RSA:+ECDHE-ECDSA

> gnutls-cli -l --priority "NONE:+SHA512:+SHA384:+SHA256:+DHE-RSA:+DHE-PSK:+DHE-DSS:+AES-256-CBC:+AES-128-CBC:+3DES-CBC:+VERS-TLS1.2:+VERS-TLS1.1:+VERS-TLS1.0:+COMP-NULL:+SHA1:+SIGN-ALL:+ECDHE-RSA:+ECDHE-ECDSA"
Cipher suites for NONE:+SHA512:+SHA384:+SHA256:+DHE-RSA:+DHE-PSK:+DHE-DSS:+AES-256-CBC:+AES-128-CBC:+3DES-CBC:+VERS-TLS1.2:+VERS-TLS1.1:+VERS-TLS1.0:+COMP-NULL:+SHA1:+SIGN-ALL:+ECDHE-RSA:+ECDHE-ECDSA
TLS_DHE_RSA_AES_256_CBC_SHA256                          0x00, 0x6b      TLS1.0
TLS_DHE_RSA_AES_256_CBC_SHA1                            0x00, 0x39      SSL3.0
TLS_DHE_RSA_AES_128_CBC_SHA256                          0x00, 0x67      TLS1.0
TLS_DHE_RSA_AES_128_CBC_SHA1                            0x00, 0x33      SSL3.0
TLS_DHE_RSA_3DES_EDE_CBC_SHA1                           0x00, 0x16      SSL3.0
TLS_DHE_PSK_AES_256_CBC_SHA384                          0x00, 0xb3      TLS1.0
TLS_DHE_PSK_AES_256_CBC_SHA1                            0x00, 0x91      SSL3.0
TLS_DHE_PSK_AES_128_CBC_SHA256                          0x00, 0xb2      TLS1.0
TLS_DHE_PSK_AES_128_CBC_SHA1                            0x00, 0x90      SSL3.0
TLS_DHE_PSK_3DES_EDE_CBC_SHA1                           0x00, 0x8f      SSL3.0
TLS_DHE_DSS_AES_256_CBC_SHA256                          0x00, 0x6a      TLS1.0
TLS_DHE_DSS_AES_256_CBC_SHA1                            0x00, 0x38      SSL3.0
TLS_DHE_DSS_AES_128_CBC_SHA256                          0x00, 0x40      TLS1.0
TLS_DHE_DSS_AES_128_CBC_SHA1                            0x00, 0x32      SSL3.0
TLS_DHE_DSS_3DES_EDE_CBC_SHA1                           0x00, 0x13      SSL3.0
TLS_ECDHE_RSA_AES_256_CBC_SHA384                        0xc0, 0x28      TLS1.0
TLS_ECDHE_RSA_AES_256_CBC_SHA1                          0xc0, 0x14      SSL3.0
TLS_ECDHE_RSA_AES_128_CBC_SHA256                        0xc0, 0x27      TLS1.0
TLS_ECDHE_RSA_AES_128_CBC_SHA1                          0xc0, 0x13      SSL3.0
TLS_ECDHE_RSA_3DES_EDE_CBC_SHA1                         0xc0, 0x12      SSL3.0
TLS_ECDHE_ECDSA_AES_256_CBC_SHA384                      0xc0, 0x24      TLS1.0
TLS_ECDHE_ECDSA_AES_256_CBC_SHA1                        0xc0, 0x0a      SSL3.0
TLS_ECDHE_ECDSA_AES_128_CBC_SHA256                      0xc0, 0x23      TLS1.0
TLS_ECDHE_ECDSA_AES_128_CBC_SHA1                        0xc0, 0x09      SSL3.0
TLS_ECDHE_ECDSA_3DES_EDE_CBC_SHA1                       0xc0, 0x08      SSL3.0

Certificate types: none
Protocols: VERS-TLS1.2, VERS-TLS1.1, VERS-TLS1.0
Compression: COMP-NULL
Elliptic curves: none
PK-signatures: SIGN-RSA-SHA256, SIGN-DSA-SHA256, SIGN-ECDSA-SHA256, SIGN-RSA-SHA384, SIGN-ECDSA-SHA384, SIGN-RSA-SHA512, SIGN-ECDSA-SHA512, SIGN-RSA-SHA224, SIGN-DSA-SHA224, SIGN-ECDSA-SHA224, SIGN-RSA-SHA1, SIGN-DSA-SHA1, SIGN-ECDSA-SHA1

Minhas versões de software são:

• libapache2-mod-gnutls
  • 0.5.10-1.1
• apache2
  • 2.2.22-13 + deb7u3
• gnutls-bin
  • 3.3.8-3

Answer 1

Bem, acontece que o problema está em libapache2-mod-gnutls version.

A versão 0.5.X está vinculada a libgnutls26 , que não contém essas cifras
A versão 0.6.X está associada a libgnutls28 , que contém ECDHE-RSA / ECDHE-ECDSA

Então as soluções são duas:

• Atualize para uma versão mais recente do libapache2-mod-gnutls, que requer Apache 2.4
• Use o OpenSSL contido na versão do Apache 2.2 e configure-o adequadamente

A configuração válida para libapache2-mod-gnutls é:

GnuTLSPriorities    NONE:+SHA512:+SHA384:+SHA256:+ECDHE-RSA:+ECDHE-ECDSA:+DHE-RSA:+DHE-PSK:
                    +DHE-DSS:+AES-256-CBC:+AES-128-CBC:+3DES-CBC:+VERS-TLS1.2:
                    +VERS-TLS1.1:+VERS-TLS1.0:+COMP-NULL:+SHA1:+SIGN-ALL

Configuração válida para o apache2 (openssl) é:

SSLCipherSuite ECDHE-ECDSA-AES256-SHA:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:RC4-RSA:HIGH:!MD5:!aNULL
SSLHonorCipherOrder     on
SSLCompression          off
SSLProtocol all -SSLv2 -SSLv3
Header add Strict-Transport-Security "max-age=15768000"