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Return group id in tls1_shared_group

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Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/=4412)
This commit is contained in:
Dr. Stephen Henson 2017-09-22 23:43:03 +01:00
parent 1483b8582c
commit 8841154a90
4 changed files with 17 additions and 22 deletions
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2
ssl/s3_lib.c
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@ -3633,7 +3633,7 @@ long ssl3_ctrl(SSL *s, int cmd, long larg, void *parg)
&s->ext.supportedgroups_len, parg);
case SSL_CTRL_GET_SHARED_GROUP:
return tls1_shared_group(s, larg);
return tls1_ec_curve_id2nid(tls1_shared_group(s, larg), NULL);
#endif
case SSL_CTRL_SET_SIGALGS:

2
ssl/ssl_locl.h
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@ -2336,7 +2336,7 @@ SSL_COMP *ssl3_comp_find(STACK_OF(SSL_COMP) *sk, int n);
__owur int tls1_ec_curve_id2nid(uint16_t curve_id, unsigned int *pflags);
__owur uint16_t tls1_ec_nid2curve_id(int nid);
__owur int tls1_check_curve(SSL *s, const unsigned char *p, size_t len);
__owur int tls1_shared_group(SSL *s, int nmatch);
__owur uint16_t tls1_shared_group(SSL *s, int nmatch);
__owur int tls1_set_groups(uint16_t **pext, size_t *pextlen,
int *curves, size_t ncurves);
__owur int tls1_set_groups_list(uint16_t **pext, size_t *pextlen,

4
ssl/statem/statem_srvr.c
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@ -2331,7 +2331,6 @@ int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt)
#endif
#ifndef OPENSSL_NO_EC
if (type & (SSL_kECDHE | SSL_kECDHEPSK)) {
int nid;
if (s->s3->tmp.pkey != NULL) {
SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
@ -2340,8 +2339,7 @@ int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt)
}
/* Get NID of appropriate shared curve */
nid = tls1_shared_group(s, -2);
curve_id = tls1_ec_nid2curve_id(nid);
curve_id = tls1_shared_group(s, -2);
if (curve_id == 0) {
SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);

31
ssl/t1_lib.c
View File

@ -197,7 +197,7 @@ int tls1_ec_curve_id2nid(uint16_t curve_id, unsigned int *pflags)
const tls_curve_info *cinfo;
/* ECC curves from RFC 4492 and RFC 7027 */
if (curve_id < 1 || curve_id > OSSL_NELEM(nid_list))
return 0;
return NID_undef;
cinfo = nid_list + curve_id - 1;
if (pflags)
*pflags = cinfo->flags;
@ -313,13 +313,13 @@ int tls1_check_curve(SSL *s, const unsigned char *p, size_t len)
}
/*-
* For nmatch >= 0, return the NID of the |nmatch|th shared group or NID_undef
* For nmatch >= 0, return the id of the |nmatch|th shared group or 0
* if there is no match.
* For nmatch == -1, return number of matches
* For nmatch == -2, return the NID of the group to use for
* an EC tmp key, or NID_undef if there is no match.
* For nmatch == -2, return the id of the group to use for
* an tmp key, or 0 if there is no match.
*/
int tls1_shared_group(SSL *s, int nmatch)
uint16_t tls1_shared_group(SSL *s, int nmatch)
{
const uint16_t *pref, *supp;
size_t num_pref, num_supp, i, j;
@ -327,7 +327,7 @@ int tls1_shared_group(SSL *s, int nmatch)
/* Can't do anything on client side */
if (s->server == 0)
return -1;
return 0;
if (nmatch == -2) {
if (tls1_suiteb(s)) {
/*
@ -337,11 +337,11 @@ int tls1_shared_group(SSL *s, int nmatch)
unsigned long cid = s->s3->tmp.new_cipher->id;
if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
return NID_X9_62_prime256v1; /* P-256 */
return TLSEXT_curve_P_256;
if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
return NID_secp384r1; /* P-384 */
return TLSEXT_curve_P_384;
/* Should never happen */
return NID_undef;
return 0;
}
/* If not Suite B just return first preference shared curve */
nmatch = 0;
@ -353,12 +353,11 @@ int tls1_shared_group(SSL *s, int nmatch)
if (!tls1_get_curvelist(s,
(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) != 0,
&supp, &num_supp))
/* In practice, NID_undef == 0 but let's be precise. */
return nmatch == -1 ? 0 : NID_undef;
return 0;
if (!tls1_get_curvelist(s,
(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) == 0,
&pref, &num_pref))
return nmatch == -1 ? 0 : NID_undef;
return 0;
for (k = 0, i = 0; i < num_pref; i++) {
uint16_t id = pref[i];
@ -368,7 +367,7 @@ int tls1_shared_group(SSL *s, int nmatch)
if (!tls_curve_allowed(s, id, SSL_SECOP_CURVE_SHARED))
continue;
if (nmatch == k)
return tls1_ec_curve_id2nid(id, NULL);
return id;
k++;
}
}
@ -376,7 +375,7 @@ int tls1_shared_group(SSL *s, int nmatch)
if (nmatch == -1)
return k;
/* Out of range (nmatch > k). */
return NID_undef;
return 0;
}
int tls1_set_groups(uint16_t **pext, size_t *pextlen,
@ -643,9 +642,7 @@ int tls1_check_ec_tmp_key(SSL *s, unsigned long cid)
return 1;
}
/* Need a shared curve */
if (tls1_shared_group(s, 0))
return 1;
return 0;
return tls1_shared_group(s, 0) != 0;
}
#else