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net_ssl: SSL config tweaks for compatibility and security 

add two RSA based ciphers for Windows/depends compatibility
also enforce server cipher ordering
also set ECDH to auto because vtnerd says it is good :)

When built with the depends system, openssl does not include any
cipher on the current whitelist, so add this one, which fixes the
problem, and does seem sensible.
This commit is contained in:
moneromooo-monero 2019-05-01 22:01:53 +00:00
parent 2bf855e3cd
commit a62e072571
No known key found for this signature in database
GPG Key ID: 686F07454D6CEFC3
2 changed files with 128 additions and 4 deletions
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3
contrib/epee/include/net/net_ssl.h
View File

@ -135,6 +135,9 @@ namespace net_utils
constexpr size_t get_ssl_magic_size() { return 9; }
bool is_ssl(const unsigned char *data, size_t len);
bool ssl_support_from_string(ssl_support_t &ssl, boost::string_ref s);
bool create_ec_ssl_certificate(EVP_PKEY *&pkey, X509 *&cert);
bool create_rsa_ssl_certificate(EVP_PKEY *&pkey, X509 *&cert);
}
}

129
contrib/epee/src/net_ssl.cpp
View File

@ -78,6 +78,24 @@ namespace
};
using openssl_bignum = std::unique_ptr<BIGNUM, openssl_bignum_free>;
struct openssl_ec_key_free
{
void operator()(EC_KEY* ptr) const noexcept
{
EC_KEY_free(ptr);
}
};
using openssl_ec_key = std::unique_ptr<EC_KEY, openssl_ec_key_free>;
struct openssl_group_free
{
void operator()(EC_GROUP* ptr) const noexcept
{
EC_GROUP_free(ptr);
}
};
using openssl_group = std::unique_ptr<EC_GROUP, openssl_group_free>;
boost::system::error_code load_ca_file(boost::asio::ssl::context& ctx, const std::string& path)
{
SSL_CTX* const ssl_ctx = ctx.native_handle(); // could be moved from context
@ -101,7 +119,7 @@ namespace net_utils
// https://stackoverflow.com/questions/256405/programmatically-create-x509-certificate-using-openssl
bool create_ssl_certificate(EVP_PKEY *&pkey, X509 *&cert)
bool create_rsa_ssl_certificate(EVP_PKEY *&pkey, X509 *&cert)
{
MGINFO("Generating SSL certificate");
pkey = EVP_PKEY_new();
@ -171,6 +189,87 @@ bool create_ssl_certificate(EVP_PKEY *&pkey, X509 *&cert)
return true;
}
bool create_ec_ssl_certificate(EVP_PKEY *&pkey, X509 *&cert, int type)
{
MGINFO("Generating SSL certificate");
pkey = EVP_PKEY_new();
if (!pkey)
{
MERROR("Failed to create new private key");
return false;
}
openssl_pkey pkey_deleter{pkey};
openssl_ec_key ec_key{EC_KEY_new()};
if (!ec_key)
{
MERROR("Error allocating EC private key");
return false;
}
EC_GROUP *group = EC_GROUP_new_by_curve_name(type);
if (!group)
{
MERROR("Error getting EC group " << type);
return false;
}
openssl_group group_deleter{group};
EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
EC_GROUP_set_point_conversion_form(group, POINT_CONVERSION_UNCOMPRESSED);
if (!EC_GROUP_check(group, NULL))
{
MERROR("Group failed check: " << ERR_reason_error_string(ERR_get_error()));
return false;
}
if (EC_KEY_set_group(ec_key.get(), group) != 1)
{
MERROR("Error setting EC group");
return false;
}
if (EC_KEY_generate_key(ec_key.get()) != 1)
{
MERROR("Error generating EC private key");
return false;
}
if (EVP_PKEY_assign_EC_KEY(pkey, ec_key.get()) <= 0)
{
MERROR("Error assigning EC private key");
return false;
}
// the key is now managed by the EVP_PKEY structure
(void)ec_key.release();
cert = X509_new();
if (!cert)
{
MERROR("Failed to create new X509 certificate");
return false;
}
ASN1_INTEGER_set(X509_get_serialNumber(cert), 1);
X509_gmtime_adj(X509_get_notBefore(cert), 0);
X509_gmtime_adj(X509_get_notAfter(cert), 3600 * 24 * 182); // half a year
if (!X509_set_pubkey(cert, pkey))
{
MERROR("Error setting pubkey on certificate");
X509_free(cert);
return false;
}
X509_NAME *name = X509_get_subject_name(cert);
X509_set_issuer_name(cert, name);
if (X509_sign(cert, pkey, EVP_sha256()) == 0)
{
MERROR("Error signing certificate");
X509_free(cert);
return false;
}
(void)pkey_deleter.release();
return true;
}
ssl_options_t::ssl_options_t(std::vector<std::vector<std::uint8_t>> fingerprints, std::string ca_path)
: fingerprints_(std::move(fingerprints)),
ca_path(std::move(ca_path)),
@ -195,7 +294,7 @@ boost::asio::ssl::context ssl_options_t::create_context() const
ssl_context.set_options(boost::asio::ssl::context::no_tlsv1_1);
// only allow a select handful of tls v1.3 and v1.2 ciphers to be used
SSL_CTX_set_cipher_list(ssl_context.native_handle(), "ECDHE-ECDSA-CHACHA20-POLY1305-SHA256:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-CHACHA20-POLY1305");
SSL_CTX_set_cipher_list(ssl_context.native_handle(), "ECDHE-ECDSA-CHACHA20-POLY1305-SHA256:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256");
// set options on the SSL context for added security
SSL_CTX *ctx = ssl_context.native_handle();
@ -214,6 +313,10 @@ boost::asio::ssl::context ssl_options_t::create_context() const
#ifdef SSL_OP_NO_COMPRESSION
SSL_CTX_set_options(ctx, SSL_OP_NO_COMPRESSION);
#endif
#ifdef SSL_OP_CIPHER_SERVER_PREFERENCE
SSL_CTX_set_options(ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
#endif
SSL_CTX_set_ecdh_auto(ctx, 1);
switch (verification)
{
@ -240,11 +343,29 @@ boost::asio::ssl::context ssl_options_t::create_context() const
{
EVP_PKEY *pkey;
X509 *cert;
CHECK_AND_ASSERT_THROW_MES(create_ssl_certificate(pkey, cert), "Failed to create certificate");
bool ok = false;
#ifdef USE_EXTRA_EC_CERT
CHECK_AND_ASSERT_THROW_MES(create_ec_ssl_certificate(pkey, cert, NID_secp256k1), "Failed to create certificate");
CHECK_AND_ASSERT_THROW_MES(SSL_CTX_use_certificate(ctx, cert), "Failed to use generated certificate");
if (!SSL_CTX_use_PrivateKey(ctx, pkey))
MERROR("Failed to use generated EC private key for " << NID_secp256k1);
else
ok = true;
// don't free the cert, the CTX owns it now
CHECK_AND_ASSERT_THROW_MES(SSL_CTX_use_PrivateKey(ctx, pkey), "Failed to use generated private key");
EVP_PKEY_free(pkey);
#endif
CHECK_AND_ASSERT_THROW_MES(create_rsa_ssl_certificate(pkey, cert), "Failed to create certificate");
CHECK_AND_ASSERT_THROW_MES(SSL_CTX_use_certificate(ctx, cert), "Failed to use generated certificate");
if (!SSL_CTX_use_PrivateKey(ctx, pkey))
MERROR("Failed to use generated RSA private key for RSA");
else
ok = true;
// don't free the cert, the CTX owns it now
EVP_PKEY_free(pkey);
CHECK_AND_ASSERT_THROW_MES(ok, "Failed to use any generated certificate");
}
else
auth.use_ssl_certificate(ssl_context);