163 lines
5.1 KiB
Diff
163 lines
5.1 KiB
Diff
From 4eac1dbb5f70a652d31847eec7c28d245f36cdbb Mon Sep 17 00:00:00 2001
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From: Martin Sehnoutka <msehnout@redhat.com>
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Date: Thu, 17 Nov 2016 10:48:28 +0100
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Subject: [PATCH 21/59] Introduce support for DHE based cipher suites.
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---
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parseconf.c | 1 +
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ssl.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
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tunables.c | 5 +++-
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tunables.h | 1 +
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vsftpd.conf.5 | 6 ++++
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5 files changed, 104 insertions(+), 2 deletions(-)
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diff --git a/parseconf.c b/parseconf.c
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index 3e0dba4..38e3182 100644
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--- a/parseconf.c
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+++ b/parseconf.c
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@@ -176,6 +176,7 @@ parseconf_str_array[] =
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{ "email_password_file", &tunable_email_password_file },
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{ "rsa_cert_file", &tunable_rsa_cert_file },
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{ "dsa_cert_file", &tunable_dsa_cert_file },
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+ { "dh_param_file", &tunable_dh_param_file },
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{ "ssl_ciphers", &tunable_ssl_ciphers },
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{ "rsa_private_key_file", &tunable_rsa_private_key_file },
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{ "dsa_private_key_file", &tunable_dsa_private_key_file },
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diff --git a/ssl.c b/ssl.c
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index c362983..22b69b3 100644
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--- a/ssl.c
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+++ b/ssl.c
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@@ -28,6 +28,8 @@
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#include <openssl/err.h>
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#include <openssl/rand.h>
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#include <openssl/bio.h>
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+#include <openssl/bn.h>
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+#include <openssl/param_build.h>
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#include <errno.h>
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#include <limits.h>
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@@ -58,6 +60,23 @@
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static int ssl_inited;
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static struct mystr debug_str;
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+EVP_PKEY *
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+DH_get_dh()
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+{
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+ OSSL_PARAM dh_params[2];
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+ EVP_PKEY *dh_key = NULL;
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+ EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_from_name(NULL, "DH", NULL);
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+
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+ dh_params[0] = OSSL_PARAM_construct_utf8_string("group", "ffdhe2048", 0);
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+ dh_params[1] = OSSL_PARAM_construct_end();
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+
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+ if (EVP_PKEY_keygen_init(pctx) <= 0 || EVP_PKEY_CTX_set_params(pctx, dh_params) <= 0)
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+ return NULL;
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+ EVP_PKEY_generate(pctx, &dh_key);
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+ EVP_PKEY_CTX_free(pctx);
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+ return dh_key;
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+}
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+
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void
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ssl_init(struct vsf_session* p_sess)
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{
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@@ -72,7 +89,7 @@
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{
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die("SSL: could not allocate SSL context");
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}
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- options = SSL_OP_ALL;
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+ options = SSL_OP_ALL | SSL_OP_SINGLE_DH_USE;
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if (!tunable_sslv2)
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{
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options |= SSL_OP_NO_SSLv2;
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@@ -130,6 +147,25 @@
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die("SSL: cannot load DSA private key");
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}
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}
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+ if (tunable_dh_param_file)
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+ {
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+ BIO *bio;
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+ EVP_PKEY *dh_params = NULL;
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+ if ((bio = BIO_new_file(tunable_dh_param_file, "r")) == NULL)
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+ {
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+ die("SSL: cannot load custom DH params");
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+ }
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+ else
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+ {
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+ dh_params = PEM_read_bio_Parameters(bio, NULL);
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+ BIO_free(bio);
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+
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+ if (!SSL_CTX_set0_tmp_dh_pkey(p_ctx, dh_params))
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+ {
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+ die("SSL: setting custom DH params failed");
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+ }
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+ }
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+ }
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if (tunable_ssl_ciphers &&
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SSL_CTX_set_cipher_list(p_ctx, tunable_ssl_ciphers) != 1)
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{
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@@ -184,6 +226,9 @@
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/* Ensure cached session doesn't expire */
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SSL_CTX_set_timeout(p_ctx, INT_MAX);
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}
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+
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+ SSL_CTX_set0_tmp_dh_pkey(p_ctx, DH_get_dh());
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+
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/* Set up ALPN to check for FTP protocol intention of client. */
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SSL_CTX_set_alpn_select_cb(p_ctx, ssl_alpn_callback, p_sess);
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/* Set up SNI callback for an optional hostname check. */
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diff --git a/tunables.c b/tunables.c
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index c737465..1ea7227 100644
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--- a/tunables.c
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+++ b/tunables.c
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@@ -140,6 +140,7 @@ const char* tunable_user_sub_token;
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const char* tunable_email_password_file;
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const char* tunable_rsa_cert_file;
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const char* tunable_dsa_cert_file;
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+const char* tunable_dh_param_file;
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const char* tunable_ssl_ciphers;
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const char* tunable_rsa_private_key_file;
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const char* tunable_dsa_private_key_file;
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@@ -288,7 +289,9 @@ tunables_load_defaults()
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install_str_setting("/usr/share/ssl/certs/vsftpd.pem",
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&tunable_rsa_cert_file);
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install_str_setting(0, &tunable_dsa_cert_file);
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- install_str_setting("ECDHE-RSA-AES256-GCM-SHA384", &tunable_ssl_ciphers);
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+ install_str_setting(0, &tunable_dh_param_file);
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+ install_str_setting("AES128-SHA:DES-CBC3-SHA:DHE-RSA-AES256-SHA",
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+ &tunable_ssl_ciphers);
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install_str_setting(0, &tunable_rsa_private_key_file);
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install_str_setting(0, &tunable_dsa_private_key_file);
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install_str_setting(0, &tunable_ca_certs_file);
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diff --git a/tunables.h b/tunables.h
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index 9553038..3995472 100644
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--- a/tunables.h
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+++ b/tunables.h
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@@ -142,6 +142,7 @@ extern const char* tunable_user_sub_token;
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extern const char* tunable_email_password_file;
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extern const char* tunable_rsa_cert_file;
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extern const char* tunable_dsa_cert_file;
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+extern const char* tunable_dh_param_file;
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extern const char* tunable_ssl_ciphers;
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extern const char* tunable_rsa_private_key_file;
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extern const char* tunable_dsa_private_key_file;
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diff --git a/vsftpd.conf.5 b/vsftpd.conf.5
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index fb6324e..ff94eca 100644
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--- a/vsftpd.conf.5
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+++ b/vsftpd.conf.5
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@@ -893,6 +893,12 @@ to be in the same file as the certificate.
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Default: (none)
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.TP
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+.B dh_param_file
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+This option specifies the location of the custom parameters used for
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+ephemeral Diffie-Hellman key exchange in SSL.
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+
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+Default: (none - use built in parameters appropriate for certificate key size)
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+.TP
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.B email_password_file
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This option can be used to provide an alternate file for usage by the
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.BR secure_email_list_enable
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--
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2.14.4
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