Copyright updates:

[exim.git] / src / src / tls.c

diff --git a/src/src/tls.c b/src/src/tls.c
index bc3261ad2a0eda32f757fac9d04d3a2a2aab6ebc..c48394cdbc2e1b2bdf4cd41f008e6b6dadd8d917 100644 (file)
--- a/src/src/tls.c
+++ b/src/src/tls.c
@@ -2,8 +2,8 @@
 *     Exim - an Internet mail transport agent    *
 *************************************************/
 
+/* Copyright (c) The Exim Maintainers 2020 - 2022 */
 /* Copyright (c) University of Cambridge 1995 - 2018 */
-/* Copyright (c) The Exim Maintainers 2020 - 2021 */
 /* See the file NOTICE for conditions of use and distribution. */
 
 /* This module provides TLS (aka SSL) support for Exim. The code for OpenSSL is
@@ -25,6 +25,11 @@ functions from the OpenSSL or GNU TLS libraries. */
 #endif
 
 
+/* Forward decl. */
+static void tls_client_resmption_key(tls_support *, smtp_connect_args *,
+  smtp_transport_options_block *);
+
+
 #if defined(MACRO_PREDEF) && !defined(DISABLE_TLS)
 # include "macro_predef.h"
 # ifdef USE_GNUTLS
@@ -791,6 +796,43 @@ return status == 0;
 
 
 
+static void
+tls_client_resmption_key(tls_support * tlsp, smtp_connect_args * conn_args,
+  smtp_transport_options_block * ob)
+{
+hctx * h = &tlsp->resume_hctx;
+blob b;
+gstring * g;
+
+DEBUG(D_tls) if (conn_args->host_lbserver)
+  debug_printf("TLS: lbserver '%s'\n", conn_args->host_lbserver);
+
+#ifdef EXIM_HAVE_SHA2
+exim_sha_init(h, HASH_SHA2_256);
+#else
+exim_sha_init(h, HASH_SHA1);
+#endif
+exim_sha_update_string(h, conn_args->host_lbserver);
+#ifdef SUPPORT_DANE
+if (conn_args->dane)
+  exim_sha_update(h,  CUS &conn_args->tlsa_dnsa, sizeof(dns_answer));
+#endif
+exim_sha_update_string(h, conn_args->host->address);
+exim_sha_update(h,   CUS &conn_args->host->port, sizeof(conn_args->host->port));
+exim_sha_update_string(h, conn_args->sending_ip_address);
+exim_sha_update_string(h, openssl_options);
+exim_sha_update_string(h, ob->tls_require_ciphers);
+exim_sha_update_string(h, tlsp->sni);
+#ifdef EXIM_HAVE_ALPN
+exim_sha_update_string(h, ob->tls_alpn);
+#endif
+exim_sha_finish(h, &b);
+for (g = string_get(b.len*2+1); b.len-- > 0; )
+  g = string_fmt_append(g, "%02x", *b.data++);
+tlsp->resume_index = string_from_gstring(g);
+DEBUG(D_tls) debug_printf("TLS: resume session index %s\n", tlsp->resume_index);
+}
+
 #endif /*!DISABLE_TLS*/
 #endif /*!MACRO_PREDEF*/