Start replacing the existing TLSv1.2 record layer.

This takes the same design/approach used in TLSv1.3 and provides an
opaque struct that is self contained and cannot reach back into other
layers. For now this just implements/replaces the writing of records
for DTLSv1/TLSv1.0/TLSv1.1/TLSv1.2. In doing so we stop copying the
plaintext into the same buffer that is used to transmit to the wire.

ok inoguchi@ tb@

1 files changed, 14 insertions, 1 deletions

diff --git a/lib/libssl/ssl_lib.c b/lib/libssl/ssl_lib.c
index bd3188cdf6d..bf10cea6857 100644
--- a/lib/libssl/ssl_lib.c
+++ b/lib/libssl/ssl_lib.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ssl_lib.c,v 1.220 2020/08/11 18:39:40 jsing Exp $ */
+/* $OpenBSD: ssl_lib.c,v 1.221 2020/08/30 15:40:19 jsing Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -344,6 +344,9 @@ SSL_new(SSL_CTX *ctx)
 	if (!s->method->internal->ssl_new(s))
 		goto err;
 
+	if ((s->internal->rl = tls12_record_layer_new()) == NULL)
+		goto err;
+
 	s->references = 1;
 	s->server = (ctx->method->internal->ssl_accept == ssl_undefined_function) ? 0 : 1;
 
@@ -564,6 +567,8 @@ SSL_free(SSL *s)
 	sk_SRTP_PROTECTION_PROFILE_free(s->internal->srtp_profiles);
 #endif
 
+	tls12_record_layer_free(s->internal->rl);
+
 	free(s->internal);
 	free(s);
 }
@@ -2535,6 +2540,10 @@ ssl_clear_cipher_read_state(SSL *s)
 	EVP_MD_CTX_free(s->read_hash);
 	s->read_hash = NULL;
 
+	tls12_record_layer_clear_read_state(s->internal->rl);
+	tls12_record_layer_set_read_seq_num(s->internal->rl,
+	    S3I(s)->read_sequence);
+
 	if (s->internal->aead_read_ctx != NULL) {
 		EVP_AEAD_CTX_cleanup(&s->internal->aead_read_ctx->ctx);
 		free(s->internal->aead_read_ctx);
@@ -2550,6 +2559,10 @@ ssl_clear_cipher_write_state(SSL *s)
 	EVP_MD_CTX_free(s->internal->write_hash);
 	s->internal->write_hash = NULL;
 
+	tls12_record_layer_clear_write_state(s->internal->rl);
+	tls12_record_layer_set_write_seq_num(s->internal->rl,
+	    S3I(s)->write_sequence);
+
 	if (s->internal->aead_write_ctx != NULL) {
 		EVP_AEAD_CTX_cleanup(&s->internal->aead_write_ctx->ctx);
 		free(s->internal->aead_write_ctx);