implement_ssl_get_tlsext_status_type.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jeremy Apthorp <jeremya@chromium.org>
Date: Thu, 18 Oct 2018 14:18:05 -0700
Subject: Implement SSL_get_tlsext_status_type

It's used by Node.js[1], and is simple to implement.

[1]: https://github.com/nodejs/node/blob/e2f58c71ddf0f91256cc85e6bb226a068256c5eb/src/node_crypto.cc#L2390

Change-Id: Ie5c76b848623d00f7478aeae0214c25472de523c
Reviewed-on: https://boringssl-review.googlesource.com/c/32525
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>

diff --git a/include/openssl/ssl.h b/include/openssl/ssl.h
index ae8b8385fc73701a4346202f213b5974af4e2aed..0f3d1747173ffb09eafd5c7d5d692ae3c35c9874 100644
--- a/include/openssl/ssl.h
+++ b/include/openssl/ssl.h
@@ -4268,6 +4268,14 @@ OPENSSL_EXPORT int OPENSSL_init_ssl(uint64_t opts,
 // Use |SSL_enable_ocsp_stapling| instead.
 OPENSSL_EXPORT int SSL_set_tlsext_status_type(SSL *ssl, int type);
 
+// SSL_get_tlsext_status_type returns |TLSEXT_STATUSTYPE_ocsp| if the client
+// requested OCSP stapling and |TLSEXT_STATUSTYPE_nothing| otherwise. On the
+// client, this reflects whether OCSP stapling was enabled via, e.g.,
+// |SSL_set_tlsext_status_type|. On the server, this is determined during the
+// handshake. It may be queried in callbacks set by |SSL_CTX_set_cert_cb|. The
+// result is undefined after the handshake completes.
+OPENSSL_EXPORT int SSL_get_tlsext_status_type(const SSL *ssl);
+
 // SSL_set_tlsext_status_ocsp_resp sets the OCSP response. It returns one on
 // success and zero on error. On success, |ssl| takes ownership of |resp|, which
 // must have been allocated by |OPENSSL_malloc|.
diff --git a/ssl/ssl_lib.cc b/ssl/ssl_lib.cc
index 9c16de4958ef29d638e05e0f90b9b15b11b15cac..1f648658b8cb6ae7b82132b276b927e8fb11a47a 100644
--- a/ssl/ssl_lib.cc
+++ b/ssl/ssl_lib.cc
@@ -2751,6 +2751,19 @@ int SSL_set_tlsext_status_type(SSL *ssl, int type) {
   return 1;
 }
 
+int SSL_get_tlsext_status_type(const SSL *ssl) {
+  if (ssl->server) {
+    SSL_HANDSHAKE *hs = ssl->s3->hs.get();
+    return hs != nullptr && hs->ocsp_stapling_requested
+        ? TLSEXT_STATUSTYPE_ocsp
+        : TLSEXT_STATUSTYPE_nothing;
+  }
+
+  return ssl->config != nullptr && ssl->config->ocsp_stapling_enabled
+             ? TLSEXT_STATUSTYPE_ocsp
+             : TLSEXT_STATUSTYPE_nothing;
+}
+
 int SSL_set_tlsext_status_ocsp_resp(SSL *ssl, uint8_t *resp, size_t resp_len) {
   if (SSL_set_ocsp_response(ssl, resp, resp_len)) {
     OPENSSL_free(resp);