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Cipher list selection for GnuTLS

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This patch implements the missing functionality for cipher list selection
using GnuTLS (our OpenSSL code has this already).
This commit is contained in:
Alexander Barton 2013-09-15 17:57:41 +02:00
parent 51231ac8d4
commit b9006acee3
3 changed files with 48 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
doc/sample-ngircd.conf.tmpl
View File

@ -248,12 +248,16 @@
# SSL Server Key Certificate
;CertFile = :ETCDIR:/ssl/server-cert.pem
# Select cipher suites allowed for SSL/TLS connections (OpenSSL only).
# This defaults to the empty string, so all supported ciphers are
# allowed. Please see 'man 1ssl ciphers' for details.
# The example below only allows "high strength" cipher suites, disables
# the ones without authentication, and sorts by strength:
# Select cipher suites allowed for SSL/TLS connections. This defaults
# to the empty string, so all supported ciphers are allowed. Please
# see 'man 1ssl ciphers' (OpenSSL) and 'man 3 gnutls_priority_init'
# (GnuTLS) for details.
# For example, this setting allows only "high strength" cipher suites,
# disables the ones without authentication, and sorts by strength:
# For OpenSSL:
;CipherList = HIGH:!aNULL:@STRENGTH
# For GnuTLS:
;CipherList = SECURE128
# Diffie-Hellman parameters
;DHFile = :ETCDIR:/ssl/dhparams.pem

12
man/ngircd.conf.5.tmpl
View File

@ -367,11 +367,13 @@ when it is compiled with support for SSL using OpenSSL or GnuTLS!
SSL Certificate file of the private server key.
.TP
\fBCipherList\fR (string)
OpenSSL only: Select cipher suites allowed for SSL/TLS connections. This
defaults to the empty string, so all supported ciphers are allowed. Please see
'man 1ssl ciphers' for details. This setting allows only "high strength" cipher
suites, disables the ones without authentication, and sorts by strength, for
example: "HIGH:!aNULL:@STRENGTH".
Select cipher suites allowed for SSL/TLS connections. This defaults to the
empty string, so all supported ciphers are allowed.
Please see 'man 1ssl ciphers' (OpenSSL) and 'man 3 gnutls_priority_init'
(GnuTLS) for details.
For example, this setting allows only "high strength" cipher suites, disables
the ones without authentication, and sorts by strength:
"HIGH:!aNULL:@STRENGTH" (OpenSSL), "SECURE128" (GnuTLS).
.TP
\fBDHFile\fR (string)
Name of the Diffie-Hellman Parameter file. Can be created with GnuTLS

49
src/ngircd/conn-ssl.c
View File

@ -58,6 +58,7 @@ static bool ConnSSL_LoadServerKey_openssl PARAMS(( SSL_CTX *c ));
static gnutls_certificate_credentials_t x509_cred;
static gnutls_dh_params_t dh_params;
static gnutls_priority_t priorities_cache;
static bool ConnSSL_LoadServerKey_gnutls PARAMS(( void ));
#endif
@ -308,12 +309,12 @@ ConnSSL_InitLibrary( void )
if(Conf_SSLOptions.CipherList && *Conf_SSLOptions.CipherList) {
if(SSL_CTX_set_cipher_list(newctx, Conf_SSLOptions.CipherList) == 0 ) {
Log(LOG_ERR,
"Failed to apply SSL cipher list \"%s\"!",
"Failed to apply OpenSSL cipher list \"%s\"!",
Conf_SSLOptions.CipherList);
goto out;
} else {
Log(LOG_INFO,
"Successfully applied SSL cipher list: \"%s\".",
"Successfully applied OpenSSL cipher list \"%s\".",
Conf_SSLOptions.CipherList);
}
}
@ -341,29 +342,43 @@ out:
return false;
}
if(Conf_SSLOptions.CipherList != NULL) {
Log(LOG_ERR,
"Failed to apply SSL cipher list \"%s\": Not implemented for GnuTLS!",
Conf_SSLOptions.CipherList);
array_free(&Conf_SSLOptions.ListenPorts);
return false;
}
err = gnutls_global_init();
if (err) {
Log(LOG_ERR, "Failed to initialize GnuTLS: %s",
gnutls_strerror(err));
array_free(&Conf_SSLOptions.ListenPorts);
return false;
goto out;
}
if (!ConnSSL_LoadServerKey_gnutls())
goto out;
if(Conf_SSLOptions.CipherList && *Conf_SSLOptions.CipherList) {
err = gnutls_priority_init(&priorities_cache,
Conf_SSLOptions.CipherList, NULL);
if (err != GNUTLS_E_SUCCESS) {
Log(LOG_ERR,
"Failed to apply GnuTLS cipher list \"%s\"!",
Conf_SSLOptions.CipherList);
goto out;
}
Log(LOG_INFO,
"Successfully applied GnuTLS cipher list \"%s\".",
Conf_SSLOptions.CipherList);
} else {
err = gnutls_priority_init(&priorities_cache, "NORMAL", NULL);
if (err != GNUTLS_E_SUCCESS) {
Log(LOG_ERR,
"Failed to apply GnuTLS cipher list \"NORMAL\"!");
goto out;
}
if (!ConnSSL_LoadServerKey_gnutls()) {
array_free(&Conf_SSLOptions.ListenPorts);
return false;
}
Log(LOG_INFO, "GnuTLS %s initialized.", gnutls_check_version(NULL));
initialized = true;
return true;
out:
array_free(&Conf_SSLOptions.ListenPorts);
return false;
#endif
}
@ -489,9 +504,9 @@ ConnSSL_Init_SSL(CONNECTION *c)
#endif
#ifdef HAVE_LIBGNUTLS
Conn_OPTION_ADD(c, CONN_SSL);
ret = gnutls_set_default_priority(c->ssl_state.gnutls_session);
ret = gnutls_priority_set(c->ssl_state.gnutls_session, priorities_cache);
if (ret != 0) {
Log(LOG_ERR, "Failed to set GnuTLS default priority: %s",
Log(LOG_ERR, "Failed to set GnuTLS session priorities: %s",
gnutls_strerror(ret));
ConnSSL_Free(c);
return false;