+ p = s->s3.tmp.key_block;
+ i = mac_secret_size = s->s3.tmp.new_mac_secret_size;
+
+ cl = EVP_CIPHER_get_key_length(c);
+ j = cl;
+ iivlen = tls_iv_length_within_key_block(c);
+ if (iivlen < 0) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ k = iivlen;
+ if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
+ (which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
+ mac_secret = &(p[0]);
+ n = i + i;
+ key = &(p[n]);
+ n += j + j;
+ iv = &(p[n]);
+ n += k + k;
+ } else {
+ n = i;
+ mac_secret = &(p[n]);
+ n += i + j;
+ key = &(p[n]);
+ n += j + k;
+ iv = &(p[n]);
+ n += k;
+ }
+
+ if (n > s->s3.tmp.key_block_length) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
+ switch (EVP_CIPHER_get_mode(c)) {
+ case EVP_CIPH_GCM_MODE:
+ taglen = EVP_GCM_TLS_TAG_LEN;
+ break;
+ case EVP_CIPH_CCM_MODE:
+ if ((s->s3.tmp.new_cipher->algorithm_enc
+ & (SSL_AES128CCM8 | SSL_AES256CCM8)) != 0)
+ taglen = EVP_CCM8_TLS_TAG_LEN;
+ else
+ taglen = EVP_CCM_TLS_TAG_LEN;
+ break;
+ default:
+ if (EVP_CIPHER_is_a(c, "CHACHA20-POLY1305")) {
+ taglen = EVP_CHACHAPOLY_TLS_TAG_LEN;
+ } else {
+ /* MAC secret size corresponds to the MAC output size */
+ taglen = s->s3.tmp.new_mac_secret_size;
+ }
+ break;
+ }
+
+ if (which & SSL3_CC_READ) {
+ if (s->ext.use_etm)
+ s->s3.flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_READ;
+ else
+ s->s3.flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_READ;
+
+ if (s->s3.tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
+ s->mac_flags |= SSL_MAC_FLAG_READ_MAC_STREAM;
+ else
+ s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_STREAM;
+
+ if (s->s3.tmp.new_cipher->algorithm2 & TLS1_TLSTREE)
+ s->mac_flags |= SSL_MAC_FLAG_READ_MAC_TLSTREE;
+ else
+ s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_TLSTREE;
+
+ direction = OSSL_RECORD_DIRECTION_READ;
+ } else {
+ if (s->ext.use_etm)
+ s->s3.flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
+ else
+ s->s3.flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
+
+ if (s->s3.tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
+ s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_STREAM;
+ else
+ s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM;
+
+ if (s->s3.tmp.new_cipher->algorithm2 & TLS1_TLSTREE)
+ s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_TLSTREE;
+ else
+ s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_TLSTREE;
+
+ direction = OSSL_RECORD_DIRECTION_WRITE;
+ }
+
+ if (SSL_CONNECTION_IS_DTLS(s))
+ dtls1_increment_epoch(s, which);
+
+ if (!ssl_set_new_record_layer(s, s->version, direction,
+ OSSL_RECORD_PROTECTION_LEVEL_APPLICATION,
+ NULL, 0, key, cl, iv, (size_t)k, mac_secret,
+ mac_secret_size, c, taglen, mac_type,
+ m, comp, NULL)) {
+ /* SSLfatal already called */
+ goto err;
+ }
+
+ OSSL_TRACE_BEGIN(TLS) {
+ BIO_printf(trc_out, "which = %04X, key:\n", which);
+ BIO_dump_indent(trc_out, key, EVP_CIPHER_get_key_length(c), 4);
+ BIO_printf(trc_out, "iv:\n");
+ BIO_dump_indent(trc_out, iv, k, 4);
+ } OSSL_TRACE_END(TLS);
+
+ return 1;
+ err:
+ return 0;
+}
+
+int tls1_setup_key_block(SSL_CONNECTION *s)
+{
+ unsigned char *p;
+ const EVP_CIPHER *c;
+ const EVP_MD *hash;
+ SSL_COMP *comp;
+ int mac_type = NID_undef;
+ size_t num, mac_secret_size = 0;
+ int ret = 0;
+ int ivlen;
+
+ if (s->s3.tmp.key_block_length != 0)
+ return 1;
+
+ if (!ssl_cipher_get_evp(SSL_CONNECTION_GET_CTX(s), s->session, &c, &hash,
+ &mac_type, &mac_secret_size, &comp,
+ s->ext.use_etm)) {
+ /* Error is already recorded */
+ SSLfatal_alert(s, SSL_AD_INTERNAL_ERROR);
+ return 0;
+ }
+
+ ssl_evp_cipher_free(s->s3.tmp.new_sym_enc);
+ s->s3.tmp.new_sym_enc = c;
+ ssl_evp_md_free(s->s3.tmp.new_hash);
+ s->s3.tmp.new_hash = hash;
+ s->s3.tmp.new_mac_pkey_type = mac_type;
+ s->s3.tmp.new_mac_secret_size = mac_secret_size;
+ ivlen = tls_iv_length_within_key_block(c);
+ if (ivlen < 0) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
+ return 0;
+ }
+ num = mac_secret_size + EVP_CIPHER_get_key_length(c) + ivlen;
+ num *= 2;
+
+ ssl3_cleanup_key_block(s);
+
+ if ((p = OPENSSL_malloc(num)) == NULL) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_CRYPTO_LIB);
+ goto err;
+ }
+
+ s->s3.tmp.key_block_length = num;
+ s->s3.tmp.key_block = p;
+
+ OSSL_TRACE_BEGIN(TLS) {
+ BIO_printf(trc_out, "key block length: %zu\n", num);
+ BIO_printf(trc_out, "client random\n");
+ BIO_dump_indent(trc_out, s->s3.client_random, SSL3_RANDOM_SIZE, 4);
+ BIO_printf(trc_out, "server random\n");
+ BIO_dump_indent(trc_out, s->s3.server_random, SSL3_RANDOM_SIZE, 4);
+ BIO_printf(trc_out, "master key\n");
+ BIO_dump_indent(trc_out,
+ s->session->master_key,
+ s->session->master_key_length, 4);
+ } OSSL_TRACE_END(TLS);
+
+ if (!tls1_generate_key_block(s, p, num)) {
+ /* SSLfatal() already called */
+ goto err;
+ }
+
+ OSSL_TRACE_BEGIN(TLS) {
+ BIO_printf(trc_out, "key block\n");
+ BIO_dump_indent(trc_out, p, num, 4);
+ } OSSL_TRACE_END(TLS);
+
+ ret = 1;
+ err:
+ return ret;
+}
+
+size_t tls1_final_finish_mac(SSL_CONNECTION *s, const char *str,
+ size_t slen, unsigned char *out)
+{
+ size_t hashlen;
+ unsigned char hash[EVP_MAX_MD_SIZE];
+ size_t finished_size = TLS1_FINISH_MAC_LENGTH;
+
+ if (s->s3.tmp.new_cipher->algorithm_mkey & SSL_kGOST18)
+ finished_size = 32;
+
+ if (!ssl3_digest_cached_records(s, 0)) {
+ /* SSLfatal() already called */
+ return 0;
+ }
+
+ if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
+ /* SSLfatal() already called */
+ return 0;
+ }
+
+ if (!tls1_PRF(s, str, slen, hash, hashlen, NULL, 0, NULL, 0, NULL, 0,
+ s->session->master_key, s->session->master_key_length,
+ out, finished_size, 1)) {
+ /* SSLfatal() already called */
+ return 0;
+ }
+ OPENSSL_cleanse(hash, hashlen);
+ return finished_size;
+}
+
+int tls1_generate_master_secret(SSL_CONNECTION *s, unsigned char *out,
+ unsigned char *p, size_t len,
+ size_t *secret_size)
+{
+ if (s->session->flags & SSL_SESS_FLAG_EXTMS) {
+ unsigned char hash[EVP_MAX_MD_SIZE * 2];
+ size_t hashlen;
+ /*
+ * Digest cached records keeping record buffer (if present): this won't
+ * affect client auth because we're freezing the buffer at the same
+ * point (after client key exchange and before certificate verify)
+ */
+ if (!ssl3_digest_cached_records(s, 1)
+ || !ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
+ /* SSLfatal() already called */
+ return 0;
+ }
+ OSSL_TRACE_BEGIN(TLS) {
+ BIO_printf(trc_out, "Handshake hashes:\n");
+ BIO_dump(trc_out, (char *)hash, hashlen);
+ } OSSL_TRACE_END(TLS);
+ if (!tls1_PRF(s,
+ TLS_MD_EXTENDED_MASTER_SECRET_CONST,
+ TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE,
+ hash, hashlen,
+ NULL, 0,
+ NULL, 0,
+ NULL, 0, p, len, out,
+ SSL3_MASTER_SECRET_SIZE, 1)) {
+ /* SSLfatal() already called */
+ return 0;
+ }
+ OPENSSL_cleanse(hash, hashlen);
+ } else {
+ if (!tls1_PRF(s,
+ TLS_MD_MASTER_SECRET_CONST,
+ TLS_MD_MASTER_SECRET_CONST_SIZE,
+ s->s3.client_random, SSL3_RANDOM_SIZE,
+ NULL, 0,
+ s->s3.server_random, SSL3_RANDOM_SIZE,
+ NULL, 0, p, len, out,
+ SSL3_MASTER_SECRET_SIZE, 1)) {
+ /* SSLfatal() already called */
+ return 0;
+ }
+ }
+
+ OSSL_TRACE_BEGIN(TLS) {
+ BIO_printf(trc_out, "Premaster Secret:\n");
+ BIO_dump_indent(trc_out, p, len, 4);
+ BIO_printf(trc_out, "Client Random:\n");
+ BIO_dump_indent(trc_out, s->s3.client_random, SSL3_RANDOM_SIZE, 4);
+ BIO_printf(trc_out, "Server Random:\n");
+ BIO_dump_indent(trc_out, s->s3.server_random, SSL3_RANDOM_SIZE, 4);
+ BIO_printf(trc_out, "Master Secret:\n");
+ BIO_dump_indent(trc_out,
+ s->session->master_key,
+ SSL3_MASTER_SECRET_SIZE, 4);
+ } OSSL_TRACE_END(TLS);
+
+ *secret_size = SSL3_MASTER_SECRET_SIZE;
+ return 1;
+}
+
+int tls1_export_keying_material(SSL_CONNECTION *s, unsigned char *out,
+ size_t olen, const char *label, size_t llen,
+ const unsigned char *context,
+ size_t contextlen, int use_context)
+{
+ unsigned char *val = NULL;
+ size_t vallen = 0, currentvalpos;
+ int rv = 0;
+
+ /*
+ * RFC 5705 embeds context length as uint16; reject longer context
+ * before proceeding.
+ */
+ if (contextlen > 0xffff) {
+ ERR_raise(ERR_LIB_SSL, ERR_R_PASSED_INVALID_ARGUMENT);
+ return 0;
+ }
+
+ /*
+ * construct PRF arguments we construct the PRF argument ourself rather
+ * than passing separate values into the TLS PRF to ensure that the
+ * concatenation of values does not create a prohibited label.
+ */
+ vallen = llen + SSL3_RANDOM_SIZE * 2;
+ if (use_context) {
+ vallen += 2 + contextlen;
+ }
+
+ val = OPENSSL_malloc(vallen);
+ if (val == NULL)
+ goto ret;
+ currentvalpos = 0;
+ memcpy(val + currentvalpos, (unsigned char *)label, llen);
+ currentvalpos += llen;
+ memcpy(val + currentvalpos, s->s3.client_random, SSL3_RANDOM_SIZE);
+ currentvalpos += SSL3_RANDOM_SIZE;
+ memcpy(val + currentvalpos, s->s3.server_random, SSL3_RANDOM_SIZE);
+ currentvalpos += SSL3_RANDOM_SIZE;
+
+ if (use_context) {
+ val[currentvalpos] = (contextlen >> 8) & 0xff;
+ currentvalpos++;
+ val[currentvalpos] = contextlen & 0xff;
+ currentvalpos++;
+ if ((contextlen > 0) || (context != NULL)) {
+ memcpy(val + currentvalpos, context, contextlen);
+ }
+ }
+
+ /*
+ * disallow prohibited labels note that SSL3_RANDOM_SIZE > max(prohibited
+ * label len) = 15, so size of val > max(prohibited label len) = 15 and
+ * the comparisons won't have buffer overflow
+ */
+ if (memcmp(val, TLS_MD_CLIENT_FINISH_CONST,
+ TLS_MD_CLIENT_FINISH_CONST_SIZE) == 0)
+ goto err1;
+ if (memcmp(val, TLS_MD_SERVER_FINISH_CONST,
+ TLS_MD_SERVER_FINISH_CONST_SIZE) == 0)
+ goto err1;
+ if (memcmp(val, TLS_MD_MASTER_SECRET_CONST,
+ TLS_MD_MASTER_SECRET_CONST_SIZE) == 0)
+ goto err1;
+ if (memcmp(val, TLS_MD_EXTENDED_MASTER_SECRET_CONST,
+ TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE) == 0)
+ goto err1;
+ if (memcmp(val, TLS_MD_KEY_EXPANSION_CONST,
+ TLS_MD_KEY_EXPANSION_CONST_SIZE) == 0)
+ goto err1;
+
+ rv = tls1_PRF(s,
+ val, vallen,
+ NULL, 0,
+ NULL, 0,
+ NULL, 0,
+ NULL, 0,
+ s->session->master_key, s->session->master_key_length,
+ out, olen, 0);
+
+ goto ret;
+ err1:
+ ERR_raise(ERR_LIB_SSL, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL);
+ ret:
+ OPENSSL_clear_free(val, vallen);
+ return rv;
+}