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Remove SSL_{CTX_}set_ecdh_auto() and always enable ECDH

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Reviewed-by: Dr. Stephen Henson <steve@openssl.org>
master
Kurt Roeckx 8 years ago
parent 6977e8ee4a
commit fe6ef2472d
12 changed files with 43 additions and 142 deletions
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5
CHANGES
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@ -13,6 +13,11 @@
pages. This work was developed in partnership with Intel Corp.
[Matt Caswell]
*) SSL_{CTX_}set_ecdh_auto() has been removed and ECDH is support is
always enabled now. If you want to disable the support you should
exclude it using the list of supported ciphers.
[Kurt Roeckx]
*) SSL_{CTX}_set_tmp_ecdh() which can set 1 EC curve now internally calls
SSL_{CTX_}set1_curves() which can set a list.
[Kurt Roeckx]

28
doc/ssl/SSL_CTX_set1_curves.pod
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@ -3,8 +3,7 @@
=head1 NAME
SSL_CTX_set1_curves, SSL_CTX_set1_curves_list, SSL_set1_curves,
SSL_set1_curves_list, SSL_get1_curves, SSL_get_shared_curve,
SSL_CTX_set_ecdh_auto, SSL_set_ecdh_auto - EC supported curve functions
SSL_set1_curves_list, SSL_get1_curves, SSL_get_shared_curve - EC supported curve functions
=head1 SYNOPSIS
@ -19,9 +18,6 @@ SSL_CTX_set_ecdh_auto, SSL_set_ecdh_auto - EC supported curve functions
int SSL_get1_curves(SSL *ssl, int *curves);
int SSL_get_shared_curve(SSL *s, int n);
int SSL_CTX_set_ecdh_auto(SSL_CTX *ctx, int onoff);
int SSL_set_ecdh_auto(SSL *s, int onoff);
=head1 DESCRIPTION
SSL_CTX_set1_curves() sets the supported curves for B<ctx> to B<clistlen>
@ -52,11 +48,6 @@ most applications will only be interested in the first shared curve
so B<n> is normally set to zero. If the value B<n> is out of range,
NID_undef is returned.
SSL_CTX_set_ecdh_auto() and SSL_set_ecdh_auto() set automatic curve
selection for server B<ctx> or B<ssl> to B<onoff>. If B<onoff> is 1 then
the highest preference curve is automatically used for ECDH temporary
keys used during key exchange.
All these functions are implemented as macros.
=head1 NOTES
@ -65,23 +56,10 @@ If an application wishes to make use of several of these functions for
configuration purposes either on a command line or in a file it should
consider using the SSL_CONF interface instead of manually parsing options.
The functions SSL_CTX_set_ecdh_auto() and SSL_set_ecdh_auto() can be used to
make a server always choose the most appropriate curve for a client. If set
it will override any temporary ECDH parameters set by a server. Previous
versions of OpenSSL could effectively only use a single ECDH curve set
using a function such as SSL_CTX_set_ecdh_tmp(). Newer applications should
just call:
SSL_CTX_set_ecdh_auto(ctx, 1);
and they will automatically support ECDH using the most appropriate shared
curve.
=head1 RETURN VALUES
SSL_CTX_set1_curves(), SSL_CTX_set1_curves_list(), SSL_set1_curves(),
SSL_set1_curves_list(), SSL_CTX_set_ecdh_auto() and SSL_set_ecdh_auto()
return 1 for success and 0 for failure.
SSL_CTX_set1_curves(), SSL_CTX_set1_curves_list(), SSL_set1_curves() and
SSL_set1_curves_list(), return 1 for success and 0 for failure.
SSL_get1_curves() returns the number of curves, which may be zero.

5
include/openssl/ssl.h
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@ -1202,7 +1202,6 @@ DECLARE_PEM_rw(SSL_SESSION, SSL_SESSION)
# define SSL_CTRL_SET_CURVES 91
# define SSL_CTRL_SET_CURVES_LIST 92
# define SSL_CTRL_GET_SHARED_CURVE 93
# define SSL_CTRL_SET_ECDH_AUTO 94
# define SSL_CTRL_SET_SIGALGS 97
# define SSL_CTRL_SET_SIGALGS_LIST 98
# define SSL_CTRL_CERT_FLAGS 99
@ -1335,10 +1334,6 @@ DECLARE_PEM_rw(SSL_SESSION, SSL_SESSION)
SSL_ctrl(ctx,SSL_CTRL_SET_CURVES_LIST,0,(char *)s)
# define SSL_get_shared_curve(s, n) \
SSL_ctrl(s,SSL_CTRL_GET_SHARED_CURVE,n,NULL)
# define SSL_CTX_set_ecdh_auto(ctx, onoff) \
SSL_CTX_ctrl(ctx,SSL_CTRL_SET_ECDH_AUTO,onoff,NULL)
# define SSL_set_ecdh_auto(s, onoff) \
SSL_ctrl(s,SSL_CTRL_SET_ECDH_AUTO,onoff,NULL)
# define SSL_CTX_set1_sigalgs(ctx, slist, slistlen) \
SSL_CTX_ctrl(ctx,SSL_CTRL_SET_SIGALGS,slistlen,(int *)slist)
# define SSL_CTX_set1_sigalgs_list(ctx, s) \

8
ssl/s3_lib.c
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@ -4256,11 +4256,6 @@ long ssl3_ctrl(SSL *s, int cmd, long larg, void *parg)
case SSL_CTRL_GET_SHARED_CURVE:
return tls1_shared_curve(s, larg);
# ifndef OPENSSL_NO_EC
case SSL_CTRL_SET_ECDH_AUTO:
s->cert->ecdh_tmp_auto = larg;
return 1;
# endif
#endif
case SSL_CTRL_SET_SIGALGS:
return tls1_set_sigalgs(s->cert, parg, larg, 0);
@ -4611,9 +4606,6 @@ long ssl3_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg)
return tls1_set_curves_list(&ctx->tlsext_ellipticcurvelist,
&ctx->tlsext_ellipticcurvelist_length,
parg);
case SSL_CTRL_SET_ECDH_AUTO:
ctx->cert->ecdh_tmp_auto = larg;
return 1;
#endif
case SSL_CTRL_SET_SIGALGS:
return tls1_set_sigalgs(ctx->cert, parg, larg, 0);

4
ssl/ssl_cert.c
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@ -231,10 +231,6 @@ CERT *ssl_cert_dup(CERT *cert)
ret->dh_tmp_auto = cert->dh_tmp_auto;
#endif
#ifndef OPENSSL_NO_EC
ret->ecdh_tmp_auto = cert->ecdh_tmp_auto;
#endif
for (i = 0; i < SSL_PKEY_NUM; i++) {
CERT_PKEY *cpk = cert->pkeys + i;
CERT_PKEY *rpk = ret->pkeys + i;

2
ssl/ssl_ciph.c
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@ -1415,8 +1415,6 @@ static int check_suiteb_cipher_list(const SSL_METHOD *meth, CERT *c,
*prule_str = "ECDHE-ECDSA-AES256-GCM-SHA384";
break;
}
/* Set auto ECDH parameter determination */
c->ecdh_tmp_auto = 1;
return 1;
# else
SSLerr(SSL_F_CHECK_SUITEB_CIPHER_LIST,

57
ssl/ssl_conf.c
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@ -268,48 +268,23 @@ static int cmd_Curves(SSL_CONF_CTX *cctx, const char *value)
/* ECDH temporary parameters */
static int cmd_ECDHParameters(SSL_CONF_CTX *cctx, const char *value)
{
int onoff = -1, rv = 1;
if (cctx->flags & SSL_CONF_FLAG_FILE) {
if (*value == '+') {
onoff = 1;
value++;
}
if (*value == '-') {
onoff = 0;
value++;
}
if (strcasecmp(value, "automatic") == 0) {
if (onoff == -1)
onoff = 1;
} else if (onoff != -1)
return 0;
} else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
if (strcmp(value, "auto") == 0)
onoff = 1;
}
int rv = 1;
EC_KEY *ecdh;
int nid;
if (onoff != -1) {
if (cctx->ctx)
rv = SSL_CTX_set_ecdh_auto(cctx->ctx, onoff);
else if (cctx->ssl)
rv = SSL_set_ecdh_auto(cctx->ssl, onoff);
} else {
EC_KEY *ecdh;
int nid;
nid = EC_curve_nist2nid(value);
if (nid == NID_undef)
nid = OBJ_sn2nid(value);
if (nid == 0)
return 0;
ecdh = EC_KEY_new_by_curve_name(nid);
if (!ecdh)
return 0;
if (cctx->ctx)
rv = SSL_CTX_set_tmp_ecdh(cctx->ctx, ecdh);
else if (cctx->ssl)
rv = SSL_set_tmp_ecdh(cctx->ssl, ecdh);
EC_KEY_free(ecdh);
}
nid = EC_curve_nist2nid(value);
if (nid == NID_undef)
nid = OBJ_sn2nid(value);
if (nid == 0)
return 0;
ecdh = EC_KEY_new_by_curve_name(nid);
if (!ecdh)
return 0;
if (cctx->ctx)
rv = SSL_CTX_set_tmp_ecdh(cctx->ctx, ecdh);
else if (cctx->ssl)
rv = SSL_set_tmp_ecdh(cctx->ssl, ecdh);
EC_KEY_free(ecdh);
return rv > 0;
}

15
ssl/ssl_lib.c
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@ -2010,7 +2010,7 @@ void ssl_set_masks(SSL *s, const SSL_CIPHER *cipher)
unsigned long mask_k, mask_a, emask_k, emask_a;
#ifndef OPENSSL_NO_EC
int have_ecc_cert, ecdsa_ok, ecc_pkey_size;
int have_ecdh_tmp, ecdh_ok;
int ecdh_ok;
X509 *x = NULL;
EVP_PKEY *ecc_pkey = NULL;
int pk_nid = 0, md_nid = 0;
@ -2036,9 +2036,6 @@ void ssl_set_masks(SSL *s, const SSL_CIPHER *cipher)
dh_tmp = dh_tmp_export = 0;
#endif
#ifndef OPENSSL_NO_EC
have_ecdh_tmp = c->ecdh_tmp_auto;
#endif
cpk = &(c->pkeys[SSL_PKEY_RSA_ENC]);
rsa_enc = pvalid[SSL_PKEY_RSA_ENC] & CERT_PKEY_VALID;
rsa_enc_export = (rsa_enc && EVP_PKEY_size(cpk->privatekey) * 8 <= kl);
@ -2063,8 +2060,8 @@ void ssl_set_masks(SSL *s, const SSL_CIPHER *cipher)
#ifdef CIPHER_DEBUG
fprintf(stderr,
"rt=%d rte=%d dht=%d ecdht=%d re=%d ree=%d rs=%d ds=%d dhr=%d dhd=%d\n",
rsa_tmp, rsa_tmp_export, dh_tmp, have_ecdh_tmp, rsa_enc,
"rt=%d rte=%d dht=%d re=%d ree=%d rs=%d ds=%d dhr=%d dhd=%d\n",
rsa_tmp, rsa_tmp_export, dh_tmp, rsa_enc,
rsa_enc_export, rsa_sign, dsa_sign, dh_rsa, dh_dsa);
#endif
@ -2169,10 +2166,8 @@ void ssl_set_masks(SSL *s, const SSL_CIPHER *cipher)
#endif
#ifndef OPENSSL_NO_EC
if (have_ecdh_tmp) {
mask_k |= SSL_kECDHE;
emask_k |= SSL_kECDHE;
}
mask_k |= SSL_kECDHE;
emask_k |= SSL_kECDHE;
#endif
#ifndef OPENSSL_NO_PSK

4
ssl/ssl_locl.h
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@ -1567,10 +1567,6 @@ typedef struct cert_st {
DH *dh_tmp;
DH *(*dh_tmp_cb) (SSL *ssl, int is_export, int keysize);
int dh_tmp_auto;
# endif
# ifndef OPENSSL_NO_EC
/* Select ECDH parameters automatically */
int ecdh_tmp_auto;
# endif
/* Flags related to certificates */
uint32_t cert_flags;

27
ssl/statem/statem_srvr.c
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@ -1730,7 +1730,6 @@ int tls_construct_server_key_exchange(SSL *s)
DH *dh = NULL, *dhp;
#endif
#ifndef OPENSSL_NO_EC
EC_KEY *ecdh = NULL, *ecdhp;
unsigned char *encodedPoint = NULL;
int encodedlen = 0;
int curve_id = 0;
@ -1867,15 +1866,13 @@ int tls_construct_server_key_exchange(SSL *s)
#ifndef OPENSSL_NO_EC
if (type & (SSL_kECDHE | SSL_kECDHEPSK)) {
const EC_GROUP *group;
EC_KEY *ecdh = NULL;
ecdhp = NULL;
if (s->cert->ecdh_tmp_auto) {
/* Get NID of appropriate shared curve */
int nid = tls1_shared_curve(s, -2);
if (nid != NID_undef)
ecdhp = EC_KEY_new_by_curve_name(nid);
}
if (ecdhp == NULL) {
/* Get NID of appropriate shared curve */
int nid = tls1_shared_curve(s, -2);
if (nid != NID_undef)
ecdh = EC_KEY_new_by_curve_name(nid);
if (ecdh == NULL) {
al = SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
SSL_R_MISSING_TMP_ECDH_KEY);
@ -1888,18 +1885,6 @@ int tls_construct_server_key_exchange(SSL *s)
goto err;
}
/* Duplicate the ECDH structure. */
if (ecdhp == NULL) {
SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
goto err;
}
if (s->cert->ecdh_tmp_auto)
ecdh = ecdhp;
else if ((ecdh = EC_KEY_dup(ecdhp)) == NULL) {
SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
goto err;
}
s->s3->tmp.ecdh = ecdh;
if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
(EC_KEY_get0_private_key(ecdh) == NULL) ||

29
ssl/t1_lib.c
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@ -259,8 +259,8 @@ static const unsigned char ecformats_default[] = {
TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2
};
/* The client's default curves / the server's 'auto' curves. */
static const unsigned char eccurves_auto[] = {
/* The default curves */
static const unsigned char eccurves_default[] = {
/* Prefer P-256 which has the fastest and most secure implementations. */
0, 23, /* secp256r1 (23) */
/* Other >= 256-bit prime curves. */
@ -438,13 +438,8 @@ static int tls1_get_curvelist(SSL *s, int sess,
pcurveslen = s->tlsext_ellipticcurvelist_length;
}
if (!*pcurves) {
if (!s->server || s->cert->ecdh_tmp_auto) {
*pcurves = eccurves_auto;
pcurveslen = sizeof(eccurves_auto);
} else {
*pcurves = eccurves_all;
pcurveslen = sizeof(eccurves_all);
}
*pcurves = eccurves_default;
pcurveslen = sizeof(eccurves_default);
}
}
@ -877,19 +872,11 @@ 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 assume OK */
if (s->cert->ecdh_tmp_auto)
return 1;
else
return 0;
}
if (s->cert->ecdh_tmp_auto) {
/* Need a shared curve */
if (tls1_shared_curve(s, 0))
return 1;
else
return 0;
return 1;
}
/* Need a shared curve */
if (tls1_shared_curve(s, 0))
return 1;
return 0;
}
# endif /* OPENSSL_NO_EC */

1
test/ssltest.c
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@ -1475,7 +1475,6 @@ int main(int argc, char *argv[])
goto end;
}
SSL_CTX_set_ecdh_auto(s_ctx, 1);
SSL_CTX_set_tmp_ecdh(s_ctx, ecdh);
SSL_CTX_set_options(s_ctx, SSL_OP_SINGLE_ECDH_USE);
EC_KEY_free(ecdh);

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