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add support for use of fixed DH client certificates

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This commit is contained in:
Dr. Stephen Henson
2012-01-25 14:51:49 +00:00
parent 2ff5ac55c5
commit 0d60939515
3 changed files with 122 additions and 48 deletions
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92
ssl/s3_clnt.c
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@@ -2428,18 +2428,33 @@ int ssl3_send_client_key_exchange(SSL *s)
goto err;
}
}
/* generate a new random key */
if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
{
SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
goto err;
/* Use client certificate key */
EVP_PKEY *clkey = s->cert->key->privatekey;
if (clkey)
dh_clnt = EVP_PKEY_get1_DH(clkey);
if (dh_clnt == NULL)
{
SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
ERR_R_INTERNAL_ERROR);
goto err;
}
}
if (!DH_generate_key(dh_clnt))
else
{
SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
DH_free(dh_clnt);
goto err;
/* generate a new random key */
if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
{
SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
goto err;
}
if (!DH_generate_key(dh_clnt))
{
SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
DH_free(dh_clnt);
goto err;
}
}
/* use the 'p' output buffer for the DH key, but
@@ -2463,11 +2478,16 @@ int ssl3_send_client_key_exchange(SSL *s)
/* clean up */
memset(p,0,n);
/* send off the data */
n=BN_num_bytes(dh_clnt->pub_key);
s2n(n,p);
BN_bn2bin(dh_clnt->pub_key,p);
n+=2;
if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
n = 0;
else
{
/* send off the data */
n=BN_num_bytes(dh_clnt->pub_key);
s2n(n,p);
BN_bn2bin(dh_clnt->pub_key,p);
n+=2;
}
DH_free(dh_clnt);
@@ -3054,6 +3074,40 @@ err:
return(-1);
}
/* Check a certificate can be used for client authentication. Currently
* just check cert exists and if static DH client certificates can be used.
*/
static int ssl3_check_client_certificate(SSL *s)
{
unsigned long alg_k;
if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
return 0;
alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
/* See if we can use client certificate for fixed DH */
if (alg_k & (SSL_kDHr|SSL_kDHd))
{
SESS_CERT *scert = s->session->sess_cert;
int i = scert->peer_cert_type;
EVP_PKEY *clkey = NULL, *spkey = NULL;
clkey = s->cert->key->privatekey;
/* If client key not DH assume it can be used */
if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
return 1;
if (i >= 0)
spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
if (spkey)
{
/* Compare server and client parameters */
i = EVP_PKEY_cmp_parameters(clkey, spkey);
EVP_PKEY_free(spkey);
if (i != 1)
return 0;
}
s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
}
return 1;
}
int ssl3_send_client_certificate(SSL *s)
{
X509 *x509=NULL;
@@ -3063,12 +3117,10 @@ int ssl3_send_client_certificate(SSL *s)
if (s->state == SSL3_ST_CW_CERT_A)
{
if ((s->cert == NULL) ||
(s->cert->key->x509 == NULL) ||
(s->cert->key->privatekey == NULL))
s->state=SSL3_ST_CW_CERT_B;
else
if (ssl3_check_client_certificate(s))
s->state=SSL3_ST_CW_CERT_C;
else
s->state=SSL3_ST_CW_CERT_B;
}
/* We need to get a client cert */
@@ -3100,6 +3152,8 @@ int ssl3_send_client_certificate(SSL *s)
if (x509 != NULL) X509_free(x509);
if (pkey != NULL) EVP_PKEY_free(pkey);
if (i && !ssl3_check_client_certificate(s))
i = 0;
if (i == 0)
{
if (s->version == SSL3_VERSION)