if ((alg_k & (SSL_kECDHE | SSL_kECDHEPSK))
|| (alg_a & SSL_aECDSA)
|| c->min_tls >= TLS1_3_VERSION)
- break;
+ return 1;
}
- return i < end;
+ return 0;
}
int tls_construct_ctos_ec_pt_formats(SSL *s, WPACKET *pkt, unsigned int context,
* Add TLS extension supported_groups to the ClientHello message
*/
/* TODO(TLS1.3): Add support for DHE groups */
- pcurves = s->ext.supportedgroups;
if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_SUPPORTED_GROUPS,
ERR_R_INTERNAL_ERROR);
}
/*
- * TODO(TLS1.3): There is some discussion on the TLS list as to wheter
+ * TODO(TLS1.3): There is some discussion on the TLS list as to whether
* we should include versions <TLS1.2. For the moment we do. To be
* reviewed later.
*/
#ifndef OPENSSL_NO_TLS1_3
static int add_key_share(SSL *s, WPACKET *pkt, unsigned int curve_id)
{
- unsigned char *encodedPoint = NULL;
- EVP_PKEY *key_share_key = NULL;
+ unsigned char *encoded_point;
+ EVP_PKEY *key_share_key;
size_t encodedlen;
key_share_key = ssl_generate_pkey_curve(curve_id);
/* Encode the public key. */
encodedlen = EVP_PKEY_get1_tls_encodedpoint(key_share_key,
- &encodedPoint);
+ &encoded_point);
if (encodedlen == 0) {
SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_EC_LIB);
EVP_PKEY_free(key_share_key);
/* Create KeyShareEntry */
if (!WPACKET_put_bytes_u16(pkt, curve_id)
- || !WPACKET_sub_memcpy_u16(pkt, encodedPoint, encodedlen)) {
+ || !WPACKET_sub_memcpy_u16(pkt, encoded_point, encodedlen)) {
SSLerr(SSL_F_ADD_KEY_SHARE, ERR_R_INTERNAL_ERROR);
EVP_PKEY_free(key_share_key);
- OPENSSL_free(encodedPoint);
+ OPENSSL_free(encoded_point);
return 0;
}
*/
s->s3->tmp.pkey = key_share_key;
s->s3->group_id = curve_id;
- OPENSSL_free(encodedPoint);
+ OPENSSL_free(encoded_point);
return 1;
}
return 0;
}
- pcurves = s->ext.supportedgroups;
if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_KEY_SHARE, ERR_R_INTERNAL_ERROR);
return 0;
if (!tls_curve_allowed(s, pcurves, SSL_SECOP_CURVE_SUPPORTED))
continue;
- curve_id = (pcurves[0] << 8) | pcurves[1];
+ curve_id = bytestogroup(pcurves);
break;
}
}
return 1;
}
+int tls_construct_ctos_cookie(SSL *s, WPACKET *pkt, unsigned int context,
+ X509 *x, size_t chainidx, int *al)
+{
+ int ret = 0;
+
+ /* Should only be set if we've had an HRR */
+ if (s->ext.tls13_cookie_len == 0)
+ return 1;
+
+ if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_cookie)
+ /* Extension data sub-packet */
+ || !WPACKET_start_sub_packet_u16(pkt)
+ || !WPACKET_sub_memcpy_u16(pkt, s->ext.tls13_cookie,
+ s->ext.tls13_cookie_len)
+ || !WPACKET_close(pkt)) {
+ SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_COOKIE, ERR_R_INTERNAL_ERROR);
+ goto end;
+ }
+
+ ret = 1;
+ end:
+ OPENSSL_free(s->ext.tls13_cookie);
+ s->ext.tls13_cookie = NULL;
+ s->ext.tls13_cookie_len = 0;
+
+ return ret;
+}
+
+int tls_construct_ctos_early_data(SSL *s, WPACKET *pkt, unsigned int context,
+ X509 *x, size_t chainidx, int *al)
+{
+ if (s->early_data_state != SSL_EARLY_DATA_CONNECTING
+ || s->session->ext.max_early_data == 0) {
+ s->max_early_data = 0;
+ return 1;
+ }
+ s->max_early_data = s->session->ext.max_early_data;
+
+ if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_early_data)
+ || !WPACKET_start_sub_packet_u16(pkt)
+ || !WPACKET_close(pkt)) {
+ SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_EARLY_DATA, ERR_R_INTERNAL_ERROR);
+ return 0;
+ }
+
+ /*
+ * We set this to rejected here. Later, if the server acknowledges the
+ * extension, we set it to accepted.
+ */
+ s->ext.early_data = SSL_EARLY_DATA_REJECTED;
+
+ return 1;
+}
+
#define F5_WORKAROUND_MIN_MSG_LEN 0xff
#define F5_WORKAROUND_MAX_MSG_LEN 0x200
+/*
+ * PSK pre binder overhead =
+ * 2 bytes for TLSEXT_TYPE_psk
+ * 2 bytes for extension length
+ * 2 bytes for identities list length
+ * 2 bytes for identity length
+ * 4 bytes for obfuscated_ticket_age
+ * 2 bytes for binder list length
+ * 1 byte for binder length
+ * The above excludes the number of bytes for the identity itself and the
+ * subsequent binder bytes
+ */
+#define PSK_PRE_BINDER_OVERHEAD (2 + 2 + 2 + 2 + 4 + 2 + 1)
+
int tls_construct_ctos_padding(SSL *s, WPACKET *pkt, unsigned int context,
X509 *x, size_t chainidx, int *al)
{
return 1;
/*
- * Add padding to workaround bugs in F5 terminators. See
- * https://tools.ietf.org/html/draft-agl-tls-padding-03 NB: because this
- * code calculates the length of all existing extensions it MUST always
- * appear last.
+ * Add padding to workaround bugs in F5 terminators. See RFC7685.
+ * This code calculates the length of all extensions added so far but
+ * excludes the PSK extension (because that MUST be written last). Therefore
+ * this extension MUST always appear second to last.
*/
if (!WPACKET_get_total_written(pkt, &hlen)) {
SSLerr(SSL_F_TLS_CONSTRUCT_CTOS_PADDING, ERR_R_INTERNAL_ERROR);
return 0;
}
+ /*
+ * If we're going to send a PSK then that will be written out after this
+ * extension, so we need to calculate how long it is going to be.
+ */
+ if (s->session->ssl_version == TLS1_3_VERSION
+ && s->session->ext.ticklen != 0
+ && s->session->cipher != NULL) {
+ const EVP_MD *md = ssl_md(s->session->cipher->algorithm2);
+
+ if (md != NULL) {
+ /*
+ * Add the fixed PSK overhead, the identity length and the binder
+ * length.
+ */
+ hlen += PSK_PRE_BINDER_OVERHEAD + s->session->ext.ticklen
+ + EVP_MD_size(md);
+ }
+ }
+
if (hlen > F5_WORKAROUND_MIN_MSG_LEN && hlen < F5_WORKAROUND_MAX_MSG_LEN) {
- /* Calculate the amond of padding we need to add */
+ /* Calculate the amount of padding we need to add */
hlen = F5_WORKAROUND_MAX_MSG_LEN - hlen;
/*
s->session->ext.tick_identity = TLSEXT_PSK_BAD_IDENTITY;
+ /*
+ * Note: At this stage of the code we only support adding a single
+ * resumption PSK. If we add support for multiple PSKs then the length
+ * calculations in the padding extension will need to be adjusted.
+ */
+
/*
* If this is an incompatible or new session then we have nothing to resume
* so don't add this extension.
md = ssl_md(s->session->cipher->algorithm2);
if (md == NULL) {
- /* Don't recognise this cipher so we can't use the session. Ignore it */
+ /* Don't recognize this cipher so we can't use the session. Ignore it */
+ return 1;
+ }
+
+ if (s->hello_retry_request && md != ssl_handshake_md(s)) {
+ /*
+ * Selected ciphersuite hash does not match the hash for the session so
+ * we can't use it.
+ */
return 1;
}
* MUST only be sent if we've requested a status
* request message. In TLS <= 1.2 it must also be empty.
*/
- if (s->ext.status_type == TLSEXT_STATUSTYPE_nothing
+ if (s->ext.status_type != TLSEXT_STATUSTYPE_ocsp
|| (!SSL_IS_TLS13(s) && PACKET_remaining(pkt) > 0)) {
*al = SSL_AD_UNSUPPORTED_EXTENSION;
return 0;
if (SSL_IS_TLS13(s)) {
/* We only know how to handle this if it's for the first Certificate in
- * the chain. We ignore any other repsonses.
+ * the chain. We ignore any other responses.
*/
if (chainidx != 0)
return 1;
if (!(s->options & SSL_OP_NO_ENCRYPT_THEN_MAC)
&& s->s3->tmp.new_cipher->algorithm_mac != SSL_AEAD
&& s->s3->tmp.new_cipher->algorithm_enc != SSL_RC4)
- s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC;
+ s->ext.use_etm = 1;
return 1;
}
}
/* Validate the selected group is one we support */
- pcurves = s->ext.supportedgroups;
if (!tls1_get_curvelist(s, 0, &pcurves, &num_curves)) {
SSLerr(SSL_F_TLS_PARSE_STOC_KEY_SHARE, ERR_R_INTERNAL_ERROR);
return 0;
}
for (i = 0; i < num_curves; i++, pcurves += 2) {
- if (group_id == (unsigned int)((pcurves[0] << 8) | pcurves[1]))
+ if (group_id == bytestogroup(pcurves))
break;
}
if (i >= num_curves
return 1;
}
+int tls_parse_stoc_cookie(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
+ size_t chainidx, int *al)
+{
+ PACKET cookie;
+
+ if (!PACKET_as_length_prefixed_2(pkt, &cookie)
+ || !PACKET_memdup(&cookie, &s->ext.tls13_cookie,
+ &s->ext.tls13_cookie_len)) {
+ *al = SSL_AD_DECODE_ERROR;
+ SSLerr(SSL_F_TLS_PARSE_STOC_COOKIE, SSL_R_LENGTH_MISMATCH);
+ return 0;
+ }
+
+ return 1;
+}
+
+int tls_parse_stoc_early_data(SSL *s, PACKET *pkt, unsigned int context,
+ X509 *x, size_t chainidx, int *al)
+{
+ if (context == EXT_TLS1_3_NEW_SESSION_TICKET) {
+ unsigned long max_early_data;
+
+ if (!PACKET_get_net_4(pkt, &max_early_data)
+ || PACKET_remaining(pkt) != 0) {
+ SSLerr(SSL_F_TLS_PARSE_STOC_EARLY_DATA,
+ SSL_R_INVALID_MAX_EARLY_DATA);
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+
+ s->session->ext.max_early_data = max_early_data;
+
+ return 1;
+ }
+
+ if (PACKET_remaining(pkt) != 0) {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+
+ if (s->ext.early_data != SSL_EARLY_DATA_REJECTED
+ || !s->hit
+ || s->session->ext.tick_identity != 0) {
+ /*
+ * If we get here then we didn't send early data, or we didn't resume
+ * using the first identity so the server should not be accepting it.
+ */
+ *al = SSL_AD_ILLEGAL_PARAMETER;
+ return 0;
+ }
+
+ s->ext.early_data = SSL_EARLY_DATA_ACCEPTED;
+
+ return 1;
+}
+
int tls_parse_stoc_psk(SSL *s, PACKET *pkt, unsigned int context, X509 *x,
size_t chainidx, int *al)
{
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