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MbedTLS: Adjust ciphersuite order and update documentation

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Aaron Jones 2016-10-18 11:16:38 +00:00
parent d7f66fc3bf
commit 98c4aaeaff
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1 changed files with 67 additions and 39 deletions
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106
librb/src/mbedtls_ratbox.h
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@ -44,79 +44,107 @@ static const char rb_mbedtls_personal_str[] = "charybdis/librb personalization s
/*
* Default list of supported ciphersuites
* User can override with ssl_cipher_list option in ircd.conf
* The user can override this with the ssl_cipher_list option in ircd.conf
*
* Charybdis cannot have more than one certificate configured, which means that with
* the MbedTLS backend, it will ALWAYS be serving EITHER an RSA OR ECDSA certificate.
* The format for this option is the same as the macro names below, but
* with underscores replaced with hyphens, and without the initial MBEDTLS_
*
* This means we can order ciphersuites to place all ECDSA ones ahead of RSA ones,
* without weird interactions of cipher order, such as inadvertantly preferring an
* ECDSA ciphersuite with AES128-CBC-SHA over an RSA ciphersuite with
* AES256-GCM-SHA384.
* For example;
* ssl_cipher_list = "TLS-ECDHE-RSA-WITH-AES-256-GCM-SHA384"
*
* We also prefer all AEAD ciphersuites first, even if it results in using a 128-bit
* AEAD ciphersuite instead of a 256-bit CBC ciphersuite. This is due to the fact that
* ONLY the AEAD ciphersuites in TLS are cryptographically secure in practice; the ETM
* extension for CBC ciphersuites has not seen wide adoption. This choice can be
* revisited in future; please consult me first. -- amdj
* Multiple ciphersuites can be separated by colons (:)
*
* ************************************************************************
*
* The ordering of the following list should be intuitive. Within the list;
*
* * All AEAD forward-secret ciphersuites are located first [1]
* * All SHA2 forward-secret ciphersuites are located second
* * All remaining forward-secret ciphersuites are located third
* * All non-forward-secret ciphersuites are located last, in the same order
*
* [1] Because in practice, they are the only secure ciphersuites available;
* the ETM extension for CBC ciphersuites has not seen wide adoption.
*
* In practice, all clients SHOULD support an AEAD forward-secret cipher,
* which the server will then negotiate as they are preferred.
*
* This choice can be revisited in future; please consult me first. -- amdj
*/
static const int rb_mbedtls_ciphersuites[] = {
// AEAD forward-secret ciphersuites
MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
MBEDTLS_TLS_ECDHE_ECDSA_WITH_CAMELLIA_256_GCM_SHA384,
MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_CCM,
MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
MBEDTLS_TLS_ECDHE_ECDSA_WITH_CAMELLIA_128_GCM_SHA256,
MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_CCM,
MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384,
MBEDTLS_TLS_ECDHE_ECDSA_WITH_CAMELLIA_256_CBC_SHA384,
MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
MBEDTLS_TLS_ECDHE_ECDSA_WITH_CAMELLIA_128_CBC_SHA256,
MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
MBEDTLS_TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
MBEDTLS_TLS_ECDHE_RSA_WITH_CAMELLIA_256_GCM_SHA384,
MBEDTLS_TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
MBEDTLS_TLS_ECDHE_RSA_WITH_CAMELLIA_128_GCM_SHA256,
MBEDTLS_TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384,
MBEDTLS_TLS_ECDHE_RSA_WITH_CAMELLIA_256_CBC_SHA384,
MBEDTLS_TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
MBEDTLS_TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
MBEDTLS_TLS_ECDHE_RSA_WITH_CAMELLIA_128_CBC_SHA256,
MBEDTLS_TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
MBEDTLS_TLS_DHE_RSA_WITH_AES_256_GCM_SHA384,
MBEDTLS_TLS_DHE_RSA_WITH_CAMELLIA_256_GCM_SHA384,
MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_CCM,
MBEDTLS_TLS_DHE_RSA_WITH_AES_256_CCM,
MBEDTLS_TLS_DHE_RSA_WITH_AES_256_CBC_SHA256,
MBEDTLS_TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA256,
MBEDTLS_TLS_DHE_RSA_WITH_AES_256_CBC_SHA,
MBEDTLS_TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA,
MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
MBEDTLS_TLS_ECDHE_ECDSA_WITH_CAMELLIA_128_GCM_SHA256,
MBEDTLS_TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
MBEDTLS_TLS_ECDHE_RSA_WITH_CAMELLIA_128_GCM_SHA256,
MBEDTLS_TLS_DHE_RSA_WITH_AES_128_GCM_SHA256,
MBEDTLS_TLS_DHE_RSA_WITH_CAMELLIA_128_GCM_SHA256,
MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_CCM,
MBEDTLS_TLS_DHE_RSA_WITH_AES_128_CCM,
// SHA2 forward-secret ciphersuites
MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384,
MBEDTLS_TLS_ECDHE_ECDSA_WITH_CAMELLIA_256_CBC_SHA384,
MBEDTLS_TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384,
MBEDTLS_TLS_ECDHE_RSA_WITH_CAMELLIA_256_CBC_SHA384,
MBEDTLS_TLS_DHE_RSA_WITH_AES_256_CBC_SHA256,
MBEDTLS_TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA256,
MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
MBEDTLS_TLS_ECDHE_ECDSA_WITH_CAMELLIA_128_CBC_SHA256,
MBEDTLS_TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
MBEDTLS_TLS_ECDHE_RSA_WITH_CAMELLIA_128_CBC_SHA256,
MBEDTLS_TLS_DHE_RSA_WITH_AES_128_CBC_SHA256,
MBEDTLS_TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA256,
// Remaining forward-secret ciphersuites
MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
MBEDTLS_TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
MBEDTLS_TLS_DHE_RSA_WITH_AES_256_CBC_SHA,
MBEDTLS_TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA,
MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
MBEDTLS_TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
MBEDTLS_TLS_DHE_RSA_WITH_AES_128_CBC_SHA,
MBEDTLS_TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA,
// Non-forward-secret ciphersuites
MBEDTLS_TLS_RSA_WITH_AES_256_GCM_SHA384,
MBEDTLS_TLS_RSA_WITH_CAMELLIA_256_GCM_SHA384,
MBEDTLS_TLS_RSA_WITH_AES_256_CCM,
MBEDTLS_TLS_RSA_WITH_AES_128_GCM_SHA256,
MBEDTLS_TLS_RSA_WITH_CAMELLIA_128_GCM_SHA256,
MBEDTLS_TLS_RSA_WITH_AES_128_CCM,
MBEDTLS_TLS_RSA_WITH_AES_256_CBC_SHA256,
MBEDTLS_TLS_RSA_WITH_CAMELLIA_256_CBC_SHA256,
MBEDTLS_TLS_RSA_WITH_AES_256_CBC_SHA,
MBEDTLS_TLS_RSA_WITH_CAMELLIA_256_CBC_SHA,
MBEDTLS_TLS_RSA_WITH_AES_128_CBC_SHA256,
MBEDTLS_TLS_RSA_WITH_CAMELLIA_128_CBC_SHA256,
MBEDTLS_TLS_RSA_WITH_AES_256_CBC_SHA,
MBEDTLS_TLS_RSA_WITH_CAMELLIA_256_CBC_SHA,
MBEDTLS_TLS_RSA_WITH_AES_128_CBC_SHA,
MBEDTLS_TLS_RSA_WITH_CAMELLIA_128_CBC_SHA,
0 // End of list
// The end of list sentinel
0
};
/*