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Simplify tls_construct_server_key_exchange 

Use negotiated signature algorithm and certificate index in
tls_construct_key_exchange instead of recalculating it.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2623)
This commit is contained in:
Dr. Stephen Henson 2017-02-13 18:07:00 +00:00
parent f365a3e2e5
commit f695571e10
1 changed files with 61 additions and 75 deletions
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58
ssl/statem/statem_srvr.c
View File

@ -1996,8 +1996,7 @@ int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt)
size_t encodedlen = 0; size_t encodedlen = 0;
int curve_id = 0; int curve_id = 0;
#endif #endif
EVP_PKEY *pkey; const SIGALG_LOOKUP *lu = s->s3->tmp.sigalg;
const EVP_MD *md = NULL;
int al = SSL_AD_INTERNAL_ERROR, i; int al = SSL_AD_INTERNAL_ERROR, i;
unsigned long type; unsigned long type;
const BIGNUM *r[4]; const BIGNUM *r[4];
@ -2154,17 +2153,13 @@ int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt)
goto f_err; goto f_err;
} }
if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP)) if (((s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP)) != 0)
&& !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)) { || ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)) != 0) {
if (s->s3->tmp.cert_idx == -1 || s->s3->tmp.sigalg == NULL) { lu = NULL;
} else if (lu == NULL) {
al = SSL_AD_DECODE_ERROR; al = SSL_AD_DECODE_ERROR;
goto f_err; goto f_err;
} }
pkey = s->cert->pkeys[s->s3->tmp.cert_idx].privatekey;
md = ssl_md(s->s3->tmp.sigalg->hash_idx);
} else {
pkey = NULL;
}
#ifndef OPENSSL_NO_PSK #ifndef OPENSSL_NO_PSK
if (type & SSL_PSK) { if (type & SSL_PSK) {
@ -2253,15 +2248,23 @@ int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt)
#endif #endif
/* not anonymous */ /* not anonymous */
if (pkey != NULL) { if (lu != NULL) {
EVP_PKEY *pkey = s->cert->pkeys[s->s3->tmp.cert_idx].privatekey;
const EVP_MD *md = ssl_md(lu->hash_idx);
unsigned char *sigbytes1, *sigbytes2;
size_t siglen;
if (pkey == NULL || md == NULL) {
/* Should never happen */
al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
ERR_R_INTERNAL_ERROR);
goto f_err;
}
/* /*
* n is the length of the params, they start at &(d[4]) and p * n is the length of the params, they start at &(d[4]) and p
* points to the space at the end. * points to the space at the end.
*/ */
if (md) {
unsigned char *sigbytes1, *sigbytes2;
size_t siglen;
int ispss = 0;
/* Get length of the parameters we have written above */ /* Get length of the parameters we have written above */
if (!WPACKET_get_length(pkt, &paramlen)) { if (!WPACKET_get_length(pkt, &paramlen)) {
@ -2270,17 +2273,8 @@ int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt)
goto f_err; goto f_err;
} }
/* send signature algorithm */ /* send signature algorithm */
if (SSL_USE_SIGALGS(s)) { if (SSL_USE_SIGALGS(s) && !WPACKET_put_bytes_u16(pkt, lu->sigalg))
if (!tls12_get_sigandhash(s, pkt, pkey, md, &ispss)) { return 0;
/* Should never happen */
SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
ERR_R_INTERNAL_ERROR);
goto f_err;
}
}
#ifdef SSL_DEBUG
fprintf(stderr, "Using hash %s\n", EVP_MD_name(md));
#endif
/* /*
* Create the signature. We don't know the actual length of the sig * Create the signature. We don't know the actual length of the sig
* until after we've created it, so we reserve enough bytes for it * until after we've created it, so we reserve enough bytes for it
@ -2294,9 +2288,8 @@ int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt)
ERR_R_INTERNAL_ERROR); ERR_R_INTERNAL_ERROR);
goto f_err; goto f_err;
} }
if (ispss) { if (lu->sig == EVP_PKEY_RSA_PSS) {
if (EVP_PKEY_CTX_set_rsa_padding(pctx, if (EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) <= 0
RSA_PKCS1_PSS_PADDING) <= 0
|| EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, RSA_PSS_SALTLEN_DIGEST) <= 0) { || EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, RSA_PSS_SALTLEN_DIGEST) <= 0) {
SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
ERR_R_EVP_LIB); ERR_R_EVP_LIB);
@ -2317,13 +2310,6 @@ int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt)
ERR_R_INTERNAL_ERROR); ERR_R_INTERNAL_ERROR);
goto f_err; goto f_err;
} }
} else {
/* Is this error check actually needed? */
al = SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
SSL_R_UNKNOWN_PKEY_TYPE);
goto f_err;
}
} }
EVP_MD_CTX_free(md_ctx); EVP_MD_CTX_free(md_ctx);