Fixed various style issues in the key_share code
Numerous style issues as well as references to TLS1_3_VERSION instead of
SSL_IS_TLS13(s)
Reviewed-by: Rich Salz <rsalz@openssl.org>
diff --git a/ssl/t1_lib.c b/ssl/t1_lib.c
index 6474c6d..56b6f27 100644
--- a/ssl/t1_lib.c
+++ b/ssl/t1_lib.c
@@ -1048,7 +1048,7 @@
break;
}
}
- } else if (s->version >= TLS1_3_VERSION) {
+ } else if (SSL_IS_TLS13(s)) {
/*
* TODO(TLS1.3): We always use ECC for TLSv1.3 at the moment. This will
* change if we implement DH key shares
@@ -1056,7 +1056,7 @@
using_ecc = 1;
}
#else
- if (s->version >= TLS1_3_VERSION) {
+ if (SSL_IS_TLS13(s)) {
/* Shouldn't happen! */
SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
return 0;
@@ -1423,57 +1423,57 @@
* now, just send one
*/
for (i = 0; i < num_curves && sharessent < 1; i++, pcurves += 2) {
- if (tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED)) {
- unsigned char *encodedPoint = NULL;
- unsigned int curve_id = 0;
- EVP_PKEY *key_share_key = NULL;
- size_t encodedlen;
+ unsigned char *encodedPoint = NULL;
+ unsigned int curve_id = 0;
+ EVP_PKEY *key_share_key = NULL;
+ size_t encodedlen;
- if (s->s3->tmp.pkey != NULL) {
- /* Shouldn't happen! */
- SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT,
- ERR_R_INTERNAL_ERROR);
- return 0;
- }
+ if (!tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED))
+ continue;
- /* Generate a key for this key_share */
- curve_id = (pcurves[0] << 8) | pcurves[1];
- key_share_key = ssl_generate_pkey_curve(curve_id);
- if (key_share_key == NULL) {
- SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_EVP_LIB);
- return 0;
- }
-
- /* Encode the public key. */
- encodedlen = EVP_PKEY_get1_tls_encodedpoint(key_share_key,
- &encodedPoint);
- if (encodedlen == 0) {
- SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_EC_LIB);
- EVP_PKEY_free(key_share_key);
- return 0;
- }
-
- /* Create KeyShareEntry */
- if (!WPACKET_put_bytes_u16(pkt, curve_id)
- || !WPACKET_sub_memcpy_u16(pkt, encodedPoint,
- encodedlen)) {
- SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT,
- ERR_R_INTERNAL_ERROR);
- EVP_PKEY_free(key_share_key);
- OPENSSL_free(encodedPoint);
- return 0;
- }
-
- /*
- * TODO(TLS1.3): When changing to send more than one key_share
- * we're going to need to be able to save more than one EVP_PKEY
- * For now we reuse the existing tmp.pkey
- */
- s->s3->group_id = curve_id;
- s->s3->tmp.pkey = key_share_key;
- sharessent++;
- OPENSSL_free(encodedPoint);
+ if (s->s3->tmp.pkey != NULL) {
+ /* Shouldn't happen! */
+ SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT,
+ ERR_R_INTERNAL_ERROR);
+ return 0;
}
+
+ /* Generate a key for this key_share */
+ curve_id = (pcurves[0] << 8) | pcurves[1];
+ key_share_key = ssl_generate_pkey_curve(curve_id);
+ if (key_share_key == NULL) {
+ SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_EVP_LIB);
+ return 0;
+ }
+
+ /* Encode the public key. */
+ encodedlen = EVP_PKEY_get1_tls_encodedpoint(key_share_key,
+ &encodedPoint);
+ if (encodedlen == 0) {
+ SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_EC_LIB);
+ EVP_PKEY_free(key_share_key);
+ return 0;
+ }
+
+ /* Create KeyShareEntry */
+ if (!WPACKET_put_bytes_u16(pkt, curve_id)
+ || !WPACKET_sub_memcpy_u16(pkt, encodedPoint, encodedlen)) {
+ SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT,
+ ERR_R_INTERNAL_ERROR);
+ EVP_PKEY_free(key_share_key);
+ OPENSSL_free(encodedPoint);
+ return 0;
+ }
+
+ /*
+ * TODO(TLS1.3): When changing to send more than one key_share we're
+ * going to need to be able to save more than one EVP_PKEY. For now
+ * we reuse the existing tmp.pkey
+ */
+ s->s3->group_id = curve_id;
+ s->s3->tmp.pkey = key_share_key;
+ sharessent++;
+ OPENSSL_free(encodedPoint);
}
if (!WPACKET_close(pkt) || !WPACKET_close(pkt)) {
SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
@@ -1516,6 +1516,59 @@
return 1;
}
+/*
+ * Add the key_share extension.
+ *
+ * Returns 1 on success or 0 on failure.
+ */
+static int add_client_key_share_ext(SSL *s, WPACKET *pkt, int *al)
+{
+ unsigned char *encodedPoint;
+ size_t encoded_pt_len = 0;
+ EVP_PKEY *ckey = s->s3->peer_tmp, *skey = NULL;
+
+ if (ckey == NULL) {
+ SSLerr(SSL_F_ADD_CLIENT_KEY_SHARE_EXT, ERR_R_INTERNAL_ERROR);
+ return 0;
+ }
+
+ if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share)
+ || !WPACKET_start_sub_packet_u16(pkt)
+ || !WPACKET_put_bytes_u16(pkt, s->s3->group_id)) {
+ SSLerr(SSL_F_ADD_CLIENT_KEY_SHARE_EXT, ERR_R_INTERNAL_ERROR);
+ return 0;
+ }
+
+ skey = ssl_generate_pkey(ckey);
+
+ /* Generate encoding of server key */
+ encoded_pt_len = EVP_PKEY_get1_tls_encodedpoint(skey, &encodedPoint);
+ if (encoded_pt_len == 0) {
+ SSLerr(SSL_F_ADD_CLIENT_KEY_SHARE_EXT, ERR_R_EC_LIB);
+ EVP_PKEY_free(skey);
+ return 0;
+ }
+
+ if (!WPACKET_sub_memcpy_u16(pkt, encodedPoint, encoded_pt_len)
+ || !WPACKET_close(pkt)) {
+ SSLerr(SSL_F_ADD_CLIENT_KEY_SHARE_EXT, ERR_R_INTERNAL_ERROR);
+ EVP_PKEY_free(skey);
+ OPENSSL_free(encodedPoint);
+ return 0;
+ }
+ OPENSSL_free(encodedPoint);
+
+ /* This causes the crypto state to be updated based on the derived keys */
+ s->s3->tmp.pkey = skey;
+ if (ssl_derive(s, skey, ckey, 1) == 0) {
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_ADD_CLIENT_KEY_SHARE_EXT, ERR_R_INTERNAL_ERROR);
+ return 0;
+ }
+
+ return 1;
+}
+
int ssl_add_serverhello_tlsext(SSL *s, WPACKET *pkt, int *al)
{
#ifndef OPENSSL_NO_NEXTPROTONEG
@@ -1649,51 +1702,8 @@
}
#endif
- if (s->version == TLS1_3_VERSION && !s->hit) {
- unsigned char *encodedPoint;
- size_t encoded_pt_len = 0;
- EVP_PKEY *ckey = NULL, *skey = NULL;
-
- ckey = s->s3->peer_tmp;
- if (ckey == NULL) {
- SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
- return 0;
- }
-
- if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_key_share)
- || !WPACKET_start_sub_packet_u16(pkt)
- || !WPACKET_put_bytes_u16(pkt, s->s3->group_id)) {
- SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
- return 0;
- }
-
- skey = ssl_generate_pkey(ckey);
-
- /* Generate encoding of server key */
- encoded_pt_len = EVP_PKEY_get1_tls_encodedpoint(skey, &encodedPoint);
- if (encoded_pt_len == 0) {
- SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_EC_LIB);
- EVP_PKEY_free(skey);
- return 0;
- }
-
- if (!WPACKET_sub_memcpy_u16(pkt, encodedPoint, encoded_pt_len)
- || !WPACKET_close(pkt)) {
- SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
- EVP_PKEY_free(skey);
- OPENSSL_free(encodedPoint);
- return 0;
- }
- OPENSSL_free(encodedPoint);
-
- s->s3->tmp.pkey = skey;
-
- if (ssl_derive(s, skey, ckey, 1) == 0) {
- *al = SSL_AD_INTERNAL_ERROR;
- SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
- return 0;
- }
- }
+ if (SSL_IS_TLS13(s) && !s->hit && !add_client_key_share_ext(s, pkt, al))
+ return 0;
if (!custom_ext_add(s, 1, pkt, al)) {
SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
@@ -1890,9 +1900,7 @@
* Process the supported_groups extension if present. Returns success if the
* extension is absent, or if it has been successfully processed.
*
- * Returns
- * 1 on success
- * 0 on failure
+ * Returns 1 on success or 0 on failure
*/
static int tls_process_supported_groups(SSL *s, CLIENTHELLO_MSG *hello)
{
@@ -1926,11 +1934,8 @@
/*
* Checks a list of |groups| to determine if the |group_id| is in it. If it is
* and |checkallow| is 1 then additionally check if the group is allowed to be
- * used.
- *
- * Returns:
- * 1 if the group is in the list (and allowed if |checkallow| is 1)
- * 0 otherwise
+ * used. Returns 1 if the group is in the list (and allowed if |checkallow| is
+ * 1) or 0 otherwise.
*/
static int check_in_list(SSL *s, unsigned int group_id,
const unsigned char *groups, size_t num_groups,
@@ -1943,6 +1948,7 @@
for (i = 0; i < num_groups; i++, groups += 2) {
unsigned int share_id = (groups[0] << 8) | (groups[1]);
+
if (group_id == share_id
&& (!checkallow || tls_curve_allowed(s, groups,
SSL_SECOP_CURVE_CHECK))) {
@@ -1950,11 +1956,130 @@
}
}
- if (i == num_groups) {
- /* Not in list */
+ /* If i == num_groups then not in the list */
+ return i < num_groups;
+}
+
+/*
+ * Process a key_share extension received in the ClientHello. |pkt| contains
+ * the raw PACKET data for the extension. Returns 1 on success or 0 on failure.
+ * If a failure occurs then |*al| is set to an appropriate alert value.
+ */
+static int process_key_share_ext(SSL *s, PACKET *pkt, int *al)
+{
+ unsigned int group_id;
+ PACKET key_share_list, encoded_pt;
+ const unsigned char *curves;
+ size_t num_curves;
+ int group_nid, found = 0;
+ unsigned int curve_flags;
+
+ /* Sanity check */
+ if (s->s3->peer_tmp != NULL) {
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_PROCESS_KEY_SHARE_EXT, ERR_R_INTERNAL_ERROR);
return 0;
}
+ if (!PACKET_as_length_prefixed_2(pkt, &key_share_list)) {
+ *al = SSL_AD_HANDSHAKE_FAILURE;
+ SSLerr(SSL_F_PROCESS_KEY_SHARE_EXT,
+ SSL_R_LENGTH_MISMATCH);
+ return 0;
+ }
+
+ while (PACKET_remaining(&key_share_list) > 0) {
+ if (!PACKET_get_net_2(&key_share_list, &group_id)
+ || !PACKET_get_length_prefixed_2(&key_share_list, &encoded_pt)
+ || PACKET_remaining(&encoded_pt) == 0) {
+ *al = SSL_AD_HANDSHAKE_FAILURE;
+ SSLerr(SSL_F_PROCESS_KEY_SHARE_EXT,
+ SSL_R_LENGTH_MISMATCH);
+ return 0;
+ }
+
+ /*
+ * If we already found a suitable key_share we loop through the
+ * rest to verify the structure, but don't process them.
+ */
+ if (found)
+ continue;
+
+ /* Check if this share is in supported_groups sent from client */
+ if (!tls1_get_curvelist(s, 1, &curves, &num_curves)) {
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_PROCESS_KEY_SHARE_EXT,
+ ERR_R_INTERNAL_ERROR);
+ return 0;
+ }
+ if (!check_in_list(s, group_id, curves, num_curves, 0)) {
+ *al = SSL_AD_HANDSHAKE_FAILURE;
+ SSLerr(SSL_F_PROCESS_KEY_SHARE_EXT,
+ SSL_R_BAD_KEY_SHARE);
+ return 0;
+ }
+
+ /* Check if this share is for a group we can use */
+ if (!tls1_get_curvelist(s, 0, &curves, &num_curves)) {
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_PROCESS_KEY_SHARE_EXT,
+ ERR_R_INTERNAL_ERROR);
+ return 0;
+ }
+ if (!check_in_list(s, group_id, curves, num_curves, 1)) {
+ /* Share not suitable */
+ continue;
+ }
+
+ group_nid = tls1_ec_curve_id2nid(group_id, &curve_flags);
+
+ if (group_nid == 0) {
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_PROCESS_KEY_SHARE_EXT,
+ SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
+ return 0;
+ }
+
+ if ((curve_flags & TLS_CURVE_TYPE) == TLS_CURVE_CUSTOM) {
+ /* Can happen for some curves, e.g. X25519 */
+ EVP_PKEY *key = EVP_PKEY_new();
+
+ if (key == NULL || !EVP_PKEY_set_type(key, group_nid)) {
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_PROCESS_KEY_SHARE_EXT, ERR_R_EVP_LIB);
+ EVP_PKEY_free(key);
+ return 0;
+ }
+ s->s3->peer_tmp = key;
+ } else {
+ /* Set up EVP_PKEY with named curve as parameters */
+ EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_EC, NULL);
+ if (pctx == NULL
+ || EVP_PKEY_paramgen_init(pctx) <= 0
+ || EVP_PKEY_CTX_set_ec_paramgen_curve_nid(pctx,
+ group_nid) <= 0
+ || EVP_PKEY_paramgen(pctx, &s->s3->peer_tmp) <= 0) {
+ *al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_PROCESS_KEY_SHARE_EXT, ERR_R_EVP_LIB);
+ EVP_PKEY_CTX_free(pctx);
+ return 0;
+ }
+ EVP_PKEY_CTX_free(pctx);
+ pctx = NULL;
+ }
+ s->s3->group_id = group_id;
+
+ if (!EVP_PKEY_set1_tls_encodedpoint(s->s3->peer_tmp,
+ PACKET_data(&encoded_pt),
+ PACKET_remaining(&encoded_pt))) {
+ *al = SSL_AD_DECODE_ERROR;
+ SSLerr(SSL_F_PROCESS_KEY_SHARE_EXT, SSL_R_BAD_ECPOINT);
+ return 0;
+ }
+
+ found = 1;
+ }
+
return 1;
}
@@ -2313,120 +2438,9 @@
&& !(s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)) {
s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC;
} else if (currext->type == TLSEXT_TYPE_key_share
- && s->version == TLS1_3_VERSION && !s->hit) {
- unsigned int group_id;
- PACKET key_share_list, encoded_pt;
- const unsigned char *curves;
- size_t num_curves;
- int group_nid, found = 0;
- unsigned int curve_flags;
-
- /* Sanity check */
- if (s->s3->peer_tmp != NULL) {
- *al = SSL_AD_INTERNAL_ERROR;
- SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
- return 0;
- }
-
- if (!PACKET_as_length_prefixed_2(&currext->data, &key_share_list)) {
- *al = SSL_AD_HANDSHAKE_FAILURE;
- SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
- SSL_R_LENGTH_MISMATCH);
- return 0;
- }
-
- while (PACKET_remaining(&key_share_list) > 0) {
- if (!PACKET_get_net_2(&key_share_list, &group_id)
- || !PACKET_get_length_prefixed_2(&key_share_list,
- &encoded_pt)
- || PACKET_remaining(&encoded_pt) == 0) {
- *al = SSL_AD_HANDSHAKE_FAILURE;
- SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
- SSL_R_LENGTH_MISMATCH);
- return 0;
- }
-
- /*
- * If we already found a suitable key_share we loop through the
- * rest to verify the structure, but don't process them.
- */
- if (found)
- continue;
-
- /* Check this share is in supported_groups */
- if (!tls1_get_curvelist(s, 1, &curves, &num_curves)) {
- *al = SSL_AD_INTERNAL_ERROR;
- SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
- ERR_R_INTERNAL_ERROR);
- return 0;
- }
- if (!check_in_list(s, group_id, curves, num_curves, 0)) {
- *al = SSL_AD_HANDSHAKE_FAILURE;
- SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
- SSL_R_BAD_KEY_SHARE);
- return 0;
- }
-
- /* Find a share that we can use */
- if (!tls1_get_curvelist(s, 0, &curves, &num_curves)) {
- *al = SSL_AD_INTERNAL_ERROR;
- SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
- ERR_R_INTERNAL_ERROR);
- return 0;
- }
- if (!check_in_list(s, group_id, curves, num_curves, 1)) {
- /* Share not suitable */
- continue;
- }
-
- group_nid = tls1_ec_curve_id2nid(group_id, &curve_flags);
-
- if (group_nid == 0) {
- *al = SSL_AD_INTERNAL_ERROR;
- SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
- SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
- return 0;
- }
-
- if ((curve_flags & TLS_CURVE_TYPE) == TLS_CURVE_CUSTOM) {
- /* Can happen for some curves, e.g. X25519 */
- EVP_PKEY *key = EVP_PKEY_new();
-
- if (key == NULL || !EVP_PKEY_set_type(key, group_nid)) {
- *al = SSL_AD_INTERNAL_ERROR;
- SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT, ERR_R_EVP_LIB);
- EVP_PKEY_free(key);
- return 0;
- }
- s->s3->peer_tmp = key;
- } else {
- /* Set up EVP_PKEY with named curve as parameters */
- EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_EC, NULL);
- if (pctx == NULL
- || EVP_PKEY_paramgen_init(pctx) <= 0
- || EVP_PKEY_CTX_set_ec_paramgen_curve_nid(pctx,
- group_nid) <= 0
- || EVP_PKEY_paramgen(pctx, &s->s3->peer_tmp) <= 0) {
- *al = SSL_AD_INTERNAL_ERROR;
- SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT, ERR_R_EVP_LIB);
- EVP_PKEY_CTX_free(pctx);
- return 0;
- }
- EVP_PKEY_CTX_free(pctx);
- pctx = NULL;
- }
- s->s3->group_id = group_id;
-
- if (!EVP_PKEY_set1_tls_encodedpoint(s->s3->peer_tmp,
- PACKET_data(&encoded_pt),
- PACKET_remaining(&encoded_pt))) {
- *al = SSL_AD_DECODE_ERROR;
- SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT, SSL_R_BAD_ECPOINT);
- return 0;
- }
-
- found = 1;
- }
+ && SSL_IS_TLS13(s) && !s->hit
+ && !process_key_share_ext(s, &currext->data, al)) {
+ return 0;
}
/*
* Note: extended master secret extension handled in
@@ -2717,12 +2731,12 @@
&& s->s3->tmp.new_cipher->algorithm_enc != SSL_RC4)
s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC;
} else if (type == TLSEXT_TYPE_extended_master_secret &&
- (SSL_IS_DTLS(s) || s->version < TLS1_3_VERSION)) {
+ (SSL_IS_DTLS(s) || !SSL_IS_TLS13(s))) {
s->s3->flags |= TLS1_FLAGS_RECEIVED_EXTMS;
if (!s->hit)
s->session->flags |= SSL_SESS_FLAG_EXTMS;
} else if (type == TLSEXT_TYPE_key_share
- && s->version == TLS1_3_VERSION) {
+ && SSL_IS_TLS13(s)) {
unsigned int group_id;
PACKET encoded_pt;
EVP_PKEY *ckey = s->s3->tmp.pkey, *skey = NULL;
@@ -2752,8 +2766,6 @@
return 0;
}
- skey = ssl_generate_pkey(ckey);
-
if (!PACKET_as_length_prefixed_2(&spkt, &encoded_pt)
|| PACKET_remaining(&encoded_pt) == 0) {
*al = SSL_AD_DECODE_ERROR;
@@ -2762,6 +2774,7 @@
return 0;
}
+ skey = ssl_generate_pkey(ckey);
if (!EVP_PKEY_set1_tls_encodedpoint(skey, PACKET_data(&encoded_pt),
PACKET_remaining(&encoded_pt))) {
*al = SSL_AD_DECODE_ERROR;
