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Remove support for SSL_{CTX_}set_tmp_ecdh_callback().

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This only gets used to set a specific curve without actually checking that the
peer supports it or not and can therefor result in handshake failures that can
be avoided by selecting a different cipher.

Reviewed-by: Dr. Stephen Henson <steve@openssl.org>
This commit is contained in:
Kurt Roeckx 2015-12-04 22:22:31 +01:00
parent ad3819c29e
commit 6f78b9e824
9 changed files with 10 additions and 68 deletions
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4
CHANGES
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@ -13,6 +13,10 @@
pages. This work was developed in partnership with Intel Corp.
[Matt Caswell]
*) Remove support for SSL_{CTX_}set_tmp_ecdh_callback(). You should set the
curve you want to support using SSL_{CTX_}set1_curves().
[Kurt Roeckx]
*) State machine rewrite. The state machine code has been significantly
refactored in order to remove much duplication of code and solve issues
with the old code (see ssl/statem/README for further details). This change

9
include/openssl/ssl.h
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@ -1119,7 +1119,6 @@ DECLARE_PEM_rw(SSL_SESSION, SSL_SESSION)
# define SSL_CTRL_SET_TMP_ECDH 4
# define SSL_CTRL_SET_TMP_RSA_CB 5
# define SSL_CTRL_SET_TMP_DH_CB 6
# define SSL_CTRL_SET_TMP_ECDH_CB 7
# define SSL_CTRL_GET_SESSION_REUSED 8
# define SSL_CTRL_GET_CLIENT_CERT_REQUEST 9
# define SSL_CTRL_GET_NUM_RENEGOTIATIONS 10
@ -1772,14 +1771,6 @@ void SSL_set_tmp_dh_callback(SSL *ssl,
DH *(*dh) (SSL *ssl, int is_export,
int keylength));
# endif
# ifndef OPENSSL_NO_EC
void SSL_CTX_set_tmp_ecdh_callback(SSL_CTX *ctx,
EC_KEY *(*ecdh) (SSL *ssl, int is_export,
int keylength));
void SSL_set_tmp_ecdh_callback(SSL *ssl,
EC_KEY *(*ecdh) (SSL *ssl, int is_export,
int keylength));
# endif
__owur const COMP_METHOD *SSL_get_current_compression(SSL *s);
__owur const COMP_METHOD *SSL_get_current_expansion(SSL *s);

24
ssl/s3_lib.c
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@ -4095,11 +4095,6 @@ long ssl3_ctrl(SSL *s, int cmd, long larg, void *parg)
ret = 1;
}
break;
case SSL_CTRL_SET_TMP_ECDH_CB:
{
SSLerr(SSL_F_SSL3_CTRL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return (ret);
}
#endif /* !OPENSSL_NO_EC */
case SSL_CTRL_SET_TLSEXT_HOSTNAME:
if (larg == TLSEXT_NAMETYPE_host_name) {
@ -4422,13 +4417,6 @@ long ssl3_callback_ctrl(SSL *s, int cmd, void (*fp) (void))
s->cert->dh_tmp_cb = (DH *(*)(SSL *, int, int))fp;
}
break;
#endif
#ifndef OPENSSL_NO_EC
case SSL_CTRL_SET_TMP_ECDH_CB:
{
s->cert->ecdh_tmp_cb = (EC_KEY *(*)(SSL *, int, int))fp;
}
break;
#endif
case SSL_CTRL_SET_TLSEXT_DEBUG_CB:
s->tlsext_debug_cb = (void (*)(SSL *, int, int,
@ -4558,11 +4546,6 @@ long ssl3_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg)
return 1;
}
/* break; */
case SSL_CTRL_SET_TMP_ECDH_CB:
{
SSLerr(SSL_F_SSL3_CTX_CTRL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return (0);
}
#endif /* !OPENSSL_NO_EC */
case SSL_CTRL_SET_TLSEXT_SERVERNAME_ARG:
ctx->tlsext_servername_arg = parg;
@ -4732,13 +4715,6 @@ long ssl3_ctx_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp) (void))
cert->dh_tmp_cb = (DH *(*)(SSL *, int, int))fp;
}
break;
#endif
#ifndef OPENSSL_NO_EC
case SSL_CTRL_SET_TMP_ECDH_CB:
{
cert->ecdh_tmp_cb = (EC_KEY *(*)(SSL *, int, int))fp;
}
break;
#endif
case SSL_CTRL_SET_TLSEXT_SERVERNAME_CB:
ctx->tlsext_servername_callback = (int (*)(SSL *, int *, void *))fp;

1
ssl/ssl_cert.c
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@ -239,7 +239,6 @@ CERT *ssl_cert_dup(CERT *cert)
goto err;
}
}
ret->ecdh_tmp_cb = cert->ecdh_tmp_cb;
ret->ecdh_tmp_auto = cert->ecdh_tmp_auto;
#endif

19
ssl/ssl_lib.c
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@ -2037,7 +2037,7 @@ void ssl_set_masks(SSL *s, const SSL_CIPHER *cipher)
#endif
#ifndef OPENSSL_NO_EC
have_ecdh_tmp = (c->ecdh_tmp || c->ecdh_tmp_cb || c->ecdh_tmp_auto);
have_ecdh_tmp = (c->ecdh_tmp || c->ecdh_tmp_auto);
#endif
cpk = &(c->pkeys[SSL_PKEY_RSA_ENC]);
rsa_enc = pvalid[SSL_PKEY_RSA_ENC] & CERT_PKEY_VALID;
@ -3142,23 +3142,6 @@ void SSL_set_tmp_dh_callback(SSL *ssl, DH *(*dh) (SSL *ssl, int is_export,
}
#endif
#ifndef OPENSSL_NO_EC
void SSL_CTX_set_tmp_ecdh_callback(SSL_CTX *ctx,
EC_KEY *(*ecdh) (SSL *ssl, int is_export,
int keylength))
{
SSL_CTX_callback_ctrl(ctx, SSL_CTRL_SET_TMP_ECDH_CB,
(void (*)(void))ecdh);
}
void SSL_set_tmp_ecdh_callback(SSL *ssl,
EC_KEY *(*ecdh) (SSL *ssl, int is_export,
int keylength))
{
SSL_callback_ctrl(ssl, SSL_CTRL_SET_TMP_ECDH_CB, (void (*)(void))ecdh);
}
#endif
#ifndef OPENSSL_NO_PSK
int SSL_CTX_use_psk_identity_hint(SSL_CTX *ctx, const char *identity_hint)
{

2
ssl/ssl_locl.h
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@ -1570,8 +1570,6 @@ typedef struct cert_st {
# endif
# ifndef OPENSSL_NO_EC
EC_KEY *ecdh_tmp;
/* Callback for generating ephemeral ECDH keys */
EC_KEY *(*ecdh_tmp_cb) (SSL *ssl, int is_export, int keysize);
/* Select ECDH parameters automatically */
int ecdh_tmp_auto;
# endif

6
ssl/statem/statem_srvr.c
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@ -1874,12 +1874,6 @@ int tls_construct_server_key_exchange(SSL *s)
int nid = tls1_shared_curve(s, -2);
if (nid != NID_undef)
ecdhp = EC_KEY_new_by_curve_name(nid);
} else if ((ecdhp == NULL) && s->cert->ecdh_tmp_cb) {
ecdhp = s->cert->ecdh_tmp_cb(s,
SSL_C_IS_EXPORT(s->s3->
tmp.new_cipher),
SSL_C_EXPORT_PKEYLENGTH(s->
s3->tmp.new_cipher));
}
if (ecdhp == NULL) {
al = SSL_AD_HANDSHAKE_FAILURE;

9
ssl/t1_lib.c
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@ -868,8 +868,8 @@ int tls1_check_ec_tmp_key(SSL *s, unsigned long cid)
/* Check this curve is acceptable */
if (!tls1_check_ec_key(s, curve_id, NULL))
return 0;
/* If auto or setting curve from callback assume OK */
if (s->cert->ecdh_tmp_auto || s->cert->ecdh_tmp_cb)
/* If auto assume OK */
if (s->cert->ecdh_tmp_auto)
return 1;
/* Otherwise check curve is acceptable */
else {
@ -892,10 +892,7 @@ int tls1_check_ec_tmp_key(SSL *s, unsigned long cid)
return 0;
}
if (!ec) {
if (s->cert->ecdh_tmp_cb)
return 1;
else
return 0;
return 0;
}
if (!tls1_set_ec_id(curve_id, NULL, ec))
return 0;

4
util/ssleay.num
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@ -217,8 +217,8 @@ SSL_renegotiate_pending 265 EXIST::FUNCTION:
SSL_CTX_set_msg_callback 266 EXIST::FUNCTION:
SSL_set_msg_callback 267 EXIST::FUNCTION:
DTLSv1_client_method 268 EXIST::FUNCTION:
SSL_CTX_set_tmp_ecdh_callback 269 EXIST::FUNCTION:EC
SSL_set_tmp_ecdh_callback 270 EXIST::FUNCTION:EC
SSL_CTX_set_tmp_ecdh_callback 269 NOEXIST::FUNCTION:
SSL_set_tmp_ecdh_callback 270 NOEXIST::FUNCTION:
SSL_COMP_get_name 271 EXIST::FUNCTION:
SSL_get_current_compression 272 EXIST::FUNCTION:
DTLSv1_method 273 EXIST::FUNCTION: