I wanted to test TLS 1.0 connection with cipher EDH-RSA-DES-CBC3-SHA.
I test with openssl s_server and s_client. Works fine. Connection and data exchanges are fine.>
@Cmidid's answer is correct. Here's a little more information, including the IETF DH groups and selecting a group size through the DH callback.
Its written in C++, but its easy enough to convert back to C.
using DH_ptr = std::unique_ptr;
using BIO_MEM_ptr = std::unique_ptr;
using BIO_FILE_ptr = std::unique_ptr;
using SSL_CTX_ptr = std::unique_ptr;
SSL_CTX* CreateServerContext(const string & domain)
{
const SSL_METHOD* method = SSLv23_server_method();
ASSERT(method != NULL);
SSL_CTX_ptr t(SSL_CTX_new(method), ::SSL_CTX_free);
ASSERT(t.get() != NULL);
long flags = SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3;
flags |= SSL_OP_NO_COMPRESSION;
flags |= SSL_OP_SAFARI_ECDHE_ECDSA_BUG;
flags |= SSL_OP_CIPHER_SERVER_PREFERENCE;
SSL_CTX_set_options(t.get(), flags);
string ciphers = "HIGH:!aNULL:!RC4:!MD5";
rc = SSL_CTX_set_cipher_list(t.get(), ciphers.c_str());
...
LogDebug("GetServerContext: setting DH callback");
SSL_CTX_set_tmp_dh_callback(t.get(), DhCallback);
LogDebug("GetServerContext: setting ECDH callback");
SSL_CTX_set_tmp_ecdh_callback(t.get(), EcdhCallback);
...
return t.release();
}
DH* DhCallback(SSL *ssl, int is_export, int keylength)
{
UNUSED(ssl);
UNUSED(is_export);
#if defined(ALLOW_DH_1024_PARAMS)
if (keylength <= 1024 + 4)
return DH1024();
else
#endif
if (keylength <= 1536 + 4)
return DH1536();
else if (keylength <= 2048 + 4)
return DH2048();
else if (keylength <= 3072 + 4)
return DH3072();
else if (keylength <= 4096 + 4)
return DH4096();
return DH4096();
}
#if defined(ALLOW_DH_1024_PARAMS)
static DH* DH1024()
{
static const char g_dh1024_sz[] = "-----BEGIN DH PARAMETERS-----\n"
"MIGHAoGBAP//////////yQ/aoiFowjTExmKLgNwc0SkCTgiKZ8x0Agu+pjsTmyJR\n"
"Sgh5jjQE3e+VGbPNOkMbMCsKbfJfFDdP4TVtbVHCReSFtXZiXn7G9ExC6aY37WsL\n"
"/1y29Aa37e44a/taiZ+lrp8kEXxLH+ZJKGZR7OZTgf//////////AgEC\n"
"-----END DH PARAMETERS-----";
static DH_ptr dh(NULL, NULL);
if (dh.get())
return dh.get();
BIO_MEM_ptr bio(BIO_new_mem_buf((void*) g_dh1024_sz, (int) sizeof(g_dh1024_sz)), ::BIO_free);
ASSERT(bio.get());
dh = DH_ptr(PEM_read_bio_DHparams(bio.get(), NULL, NULL, NULL), ::DH_free);
unsigned long err = ERR_get_error();
ASSERT(dh.get());
return dh.get();
}
#endif
static DH* DH1536()
{
static const char g_dh1536_sz[] = "-----BEGIN DH PARAMETERS-----\n"
"MIHHAoHBAP//////////yQ/aoiFowjTExmKLgNwc0SkCTgiKZ8x0Agu+pjsTmyJR\n"
"Sgh5jjQE3e+VGbPNOkMbMCsKbfJfFDdP4TVtbVHCReSFtXZiXn7G9ExC6aY37WsL\n"
"/1y29Aa37e44a/taiZ+lrp8kEXxLH+ZJKGZR7ORbPcIAfLihY78FmNpINhxV05pp\n"
"Fj+o/STPX4NlXSPco62WHGLzViCFUrue1SkHcJaWbWcMNU5KvJgE8XRsCMojcyf/\n"
"/////////wIBAg==\n"
"-----END DH PARAMETERS-----";
static DH_ptr dh(NULL, NULL);
if (dh.get())
return dh.get();
BIO_MEM_ptr bio(BIO_new_mem_buf((void*) g_dh1536_sz, (int) sizeof(g_dh1536_sz)), ::BIO_free);
ASSERT(bio.get());
dh = DH_ptr(PEM_read_bio_DHparams(bio.get(), NULL, NULL, NULL), ::DH_free);
unsigned long err = ERR_get_error();
ASSERT(dh.get());
return dh.get();
}
static DH* DH2048()
{
static const char g_dh2048_sz[] = "-----BEGIN DH PARAMETERS-----\n"
"MIIBCAKCAQEA///////////JD9qiIWjCNMTGYouA3BzRKQJOCIpnzHQCC76mOxOb\n"
"IlFKCHmONATd75UZs806QxswKwpt8l8UN0/hNW1tUcJF5IW1dmJefsb0TELppjft\n"
"awv/XLb0Brft7jhr+1qJn6WunyQRfEsf5kkoZlHs5Fs9wgB8uKFjvwWY2kg2HFXT\n"
"mmkWP6j9JM9fg2VdI9yjrZYcYvNWIIVSu57VKQdwlpZtZww1Tkq8mATxdGwIyhgh\n"
"fDKQXkYuNs474553LBgOhgObJ4Oi7Aeij7XFXfBvTFLJ3ivL9pVYFxg5lUl86pVq\n"
"5RXSJhiY+gUQFXKOWoqsqmj//////////wIBAg==\n"
"-----END DH PARAMETERS-----";
static DH_ptr dh(NULL, NULL);
if (dh.get())
return dh.get();
BIO_MEM_ptr bio(BIO_new_mem_buf((void*) g_dh2048_sz, (int) sizeof(g_dh2048_sz)), ::BIO_free);
ASSERT(bio.get());
dh = DH_ptr(PEM_read_bio_DHparams(bio.get(), NULL, NULL, NULL), ::DH_free);
unsigned long err = ERR_get_error();
ASSERT(dh.get());
return dh.get();
}
static DH* DH3072()
{
static const char g_dh3072_sz[] = "-----BEGIN DH PARAMETERS-----\n"
"MIIBiAKCAYEA///////////JD9qiIWjCNMTGYouA3BzRKQJOCIpnzHQCC76mOxOb\n"
"IlFKCHmONATd75UZs806QxswKwpt8l8UN0/hNW1tUcJF5IW1dmJefsb0TELppjft\n"
"awv/XLb0Brft7jhr+1qJn6WunyQRfEsf5kkoZlHs5Fs9wgB8uKFjvwWY2kg2HFXT\n"
"mmkWP6j9JM9fg2VdI9yjrZYcYvNWIIVSu57VKQdwlpZtZww1Tkq8mATxdGwIyhgh\n"
"fDKQXkYuNs474553LBgOhgObJ4Oi7Aeij7XFXfBvTFLJ3ivL9pVYFxg5lUl86pVq\n"
"5RXSJhiY+gUQFXKOWoqqxC2tMxcNBFB6M6hVIavfHLpk7PuFBFjb7wqK6nFXXQYM\n"
"fbOXD4Wm4eTHq/WujNsJM9cejJTgSiVhnc7j0iYa0u5r8S/6BtmKCGTYdgJzPshq\n"
"ZFIfKxgXeyAMu+EXV3phXWx3CYjAutlG4gjiT6B05asxQ9tb/OD9EI5LgtEgqTrS\n"
"yv//////////AgEC\n"
"-----END DH PARAMETERS-----";
static DH_ptr dh(NULL, NULL);
if (dh.get())
return dh.get();
BIO_MEM_ptr bio(BIO_new_mem_buf((void*) g_dh3072_sz, (int) sizeof(g_dh3072_sz)), ::BIO_free);
ASSERT(bio.get());
dh = DH_ptr(PEM_read_bio_DHparams(bio.get(), NULL, NULL, NULL), ::DH_free);
unsigned long err = ERR_get_error();
ASSERT(dh.get());
return dh.get();
}
static DH* DH4096()
{
static const char g_dh4096_sz[] = "-----BEGIN DH PARAMETERS-----\n"
"MIICCAKCAgEA///////////JD9qiIWjCNMTGYouA3BzRKQJOCIpnzHQCC76mOxOb\n"
"IlFKCHmONATd75UZs806QxswKwpt8l8UN0/hNW1tUcJF5IW1dmJefsb0TELppjft\n"
"awv/XLb0Brft7jhr+1qJn6WunyQRfEsf5kkoZlHs5Fs9wgB8uKFjvwWY2kg2HFXT\n"
"mmkWP6j9JM9fg2VdI9yjrZYcYvNWIIVSu57VKQdwlpZtZww1Tkq8mATxdGwIyhgh\n"
"fDKQXkYuNs474553LBgOhgObJ4Oi7Aeij7XFXfBvTFLJ3ivL9pVYFxg5lUl86pVq\n"
"5RXSJhiY+gUQFXKOWoqqxC2tMxcNBFB6M6hVIavfHLpk7PuFBFjb7wqK6nFXXQYM\n"
"fbOXD4Wm4eTHq/WujNsJM9cejJTgSiVhnc7j0iYa0u5r8S/6BtmKCGTYdgJzPshq\n"
"ZFIfKxgXeyAMu+EXV3phXWx3CYjAutlG4gjiT6B05asxQ9tb/OD9EI5LgtEgqSEI\n"
"ARpyPBKnh+bXiHGaEL26WyaZwycYavTiPBqUaDS2FQvaJYPpyirUTOjbu8LbBN6O\n"
"+S6O/BQfvsqmKHxZR05rwF2ZspZPoJDDoiM7oYZRW+ftH2EpcM7i16+4G912IXBI\n"
"HNAGkSfVsFqpk7TqmI2P3cGG/7fckKbAj030Nck0BjGZ//////////8CAQI=\n"
"-----END DH PARAMETERS-----";
static DH_ptr dh(NULL, NULL);
if (dh.get())
return dh.get();
BIO_MEM_ptr bio(BIO_new_mem_buf((void*) g_dh4096_sz, (int) sizeof(g_dh4096_sz)), ::BIO_free);
ASSERT(bio.get());
dh = DH_ptr(PEM_read_bio_DHparams(bio.get(), NULL, NULL, NULL), ::DH_free);
unsigned long err = ERR_get_error();
ASSERT(dh.get());
return dh.get();
}