BUILD: make tune.ssl.keylog available again

Since commit 04a5a44 ("BUILD: ssl: use HAVE_OPENSSL_KEYLOG instead of
OpenSSL versions") the "tune.ssl.keylog" feature is broken because
HAVE_OPENSSL_KEYLOG does not exist.

Replace this by a HAVE_SSL_KEYLOG which is defined in openssl-compat.h.
Also add an error when not built with the right openssl version.

Must be backported as far as 2.3.

(cherry picked from commit 722180aca8757d8807b21cf125a2d68249be5bf8)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
diff --git a/include/haproxy/openssl-compat.h b/include/haproxy/openssl-compat.h
index 96a0bf3..4c4d25d 100644
--- a/include/haproxy/openssl-compat.h
+++ b/include/haproxy/openssl-compat.h
@@ -74,6 +74,10 @@
 #define HAVE_SSL_SCTL
 #endif
 
+#if (HA_OPENSSL_VERSION_NUMBER >= 0x10101000L)
+#define HAVE_SSL_KEYLOG
+#endif
+
 #if (HA_OPENSSL_VERSION_NUMBER < 0x0090800fL)
 /* Functions present in OpenSSL 0.9.8, older not tested */
 static inline const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *sess, unsigned int *sid_length)
diff --git a/include/haproxy/ssl_sock-t.h b/include/haproxy/ssl_sock-t.h
index 991a08b..9839011 100644
--- a/include/haproxy/ssl_sock-t.h
+++ b/include/haproxy/ssl_sock-t.h
@@ -206,7 +206,7 @@
 	char ciphersuite[VAR_ARRAY];
 };
 
-#ifdef HAVE_OPENSSL_KEYLOG
+#ifdef HAVE_SSL_KEYLOG
 #define SSL_KEYLOG_MAX_SECRET_SIZE 129
 
 struct ssl_keylog {
diff --git a/src/cfgparse-ssl.c b/src/cfgparse-ssl.c
index bf7bfc6..d911902 100644
--- a/src/cfgparse-ssl.c
+++ b/src/cfgparse-ssl.c
@@ -318,7 +318,7 @@
 }
 
 /* init the SSLKEYLOGFILE pool */
-#ifdef HAVE_OPENSSL_KEYLOG
+#ifdef HAVE_SSL_KEYLOG
 static int ssl_parse_global_keylog(char **args, int section_type, struct proxy *curpx,
                                        const struct proxy *defpx, const char *file, int line,
                                        char **err)
@@ -353,6 +353,14 @@
 
 	return 0;
 }
+#else
+static int ssl_parse_global_keylog(char **args, int section_type, struct proxy *curpx,
+                                       const struct proxy *defpx, const char *file, int line,
+                                       char **err)
+{
+	memprintf(err, "'%s' requires at least OpenSSL 1.1.1.", args[0]);
+	return -1;
+}
 #endif
 
 /* parse "ssl.force-private-cache".
@@ -1877,9 +1885,7 @@
 	{ CFG_GLOBAL, "tune.ssl.maxrecord", ssl_parse_global_int },
 	{ CFG_GLOBAL, "tune.ssl.ssl-ctx-cache-size", ssl_parse_global_int },
 	{ CFG_GLOBAL, "tune.ssl.capture-cipherlist-size", ssl_parse_global_capture_cipherlist },
-#ifdef HAVE_OPENSSL_KEYLOG
 	{ CFG_GLOBAL, "tune.ssl.keylog", ssl_parse_global_keylog },
-#endif
 	{ CFG_GLOBAL, "ssl-default-bind-ciphers", ssl_parse_global_ciphers },
 	{ CFG_GLOBAL, "ssl-default-server-ciphers", ssl_parse_global_ciphers },
 #if defined(SSL_CTX_set1_curves_list)
diff --git a/src/ssl_sample.c b/src/ssl_sample.c
index 7e45412..bfa61bd 100644
--- a/src/ssl_sample.c
+++ b/src/ssl_sample.c
@@ -1189,7 +1189,7 @@
 }
 
 /* Dump the SSL keylog, it only works with "tune.ssl.keylog 1" */
-#ifdef HAVE_OPENSSL_KEYLOG
+#ifdef HAVE_SSL_KEYLOG
 static int smp_fetch_ssl_x_keylog(const struct arg *args, struct sample *smp, const char *kw, void *private)
 {
 	struct connection *conn;
@@ -1520,7 +1520,7 @@
 	{ "ssl_fc_session_key",     smp_fetch_ssl_fc_session_key, 0,                   NULL,    SMP_T_BIN,  SMP_USE_L5CLI },
 #endif
 
-#ifdef HAVE_OPENSSL_KEYLOG
+#ifdef HAVE_SSL_KEYLOG
 	{ "ssl_fc_client_early_traffic_secret",     smp_fetch_ssl_x_keylog,       0,   NULL,    SMP_T_STR,  SMP_USE_L5CLI },
 	{ "ssl_fc_client_handshake_traffic_secret", smp_fetch_ssl_x_keylog,       0,   NULL,    SMP_T_STR,  SMP_USE_L5CLI },
 	{ "ssl_fc_server_handshake_traffic_secret", smp_fetch_ssl_x_keylog,       0,   NULL,    SMP_T_STR,  SMP_USE_L5CLI },
diff --git a/src/ssl_sock.c b/src/ssl_sock.c
index c0843ea..ecae171 100644
--- a/src/ssl_sock.c
+++ b/src/ssl_sock.c
@@ -127,7 +127,7 @@
 	.capture_cipherlist = 0,
 	.extra_files = SSL_GF_ALL,
 	.extra_files_noext = 0,
-#ifdef HAVE_OPENSSL_KEYLOG
+#ifdef HAVE_SSL_KEYLOG
 	.keylog = 0
 #endif
 };
@@ -486,7 +486,7 @@
 int ssl_capture_ptr_index = -1;
 int ssl_app_data_index = -1;
 
-#ifdef HAVE_OPENSSL_KEYLOG
+#ifdef HAVE_SSL_KEYLOG
 int ssl_keylog_index = -1;
 struct pool_head *pool_head_ssl_keylog __read_mostly = NULL;
 struct pool_head *pool_head_ssl_keylog_str __read_mostly = NULL;
@@ -562,7 +562,7 @@
                                        int content_type, const void *buf, size_t len,
                                        SSL *ssl);
 
-#ifdef HAVE_OPENSSL_KEYLOG
+#ifdef HAVE_SSL_KEYLOG
 static void ssl_init_keylog(struct connection *conn, int write_p, int version,
                             int content_type, const void *buf, size_t len,
                             SSL *ssl);
@@ -607,7 +607,7 @@
 		if (!ssl_sock_register_msg_callback(ssl_sock_parse_clienthello))
 			return ERR_ABORT;
 	}
-#ifdef HAVE_OPENSSL_KEYLOG
+#ifdef HAVE_SSL_KEYLOG
 	if (global_ssl.keylog > 0) {
 		if (!ssl_sock_register_msg_callback(ssl_init_keylog))
 			return ERR_ABORT;
@@ -1786,7 +1786,7 @@
 }
 
 
-#ifdef HAVE_OPENSSL_KEYLOG
+#ifdef HAVE_SSL_KEYLOG
 static void ssl_init_keylog(struct connection *conn, int write_p, int version,
                             int content_type, const void *buf, size_t len,
                             SSL *ssl)
@@ -4194,7 +4194,7 @@
  * We only need to copy the secret as there is a sample fetch for the ClientRandom
  */
 
-#ifdef HAVE_OPENSSL_KEYLOG
+#ifdef HAVE_SSL_KEYLOG
 void SSL_CTX_keylog(const SSL *ssl, const char *line)
 {
 	struct ssl_keylog *keylog;
@@ -4430,7 +4430,7 @@
 #ifdef SSL_CTRL_SET_MSG_CALLBACK
 	SSL_CTX_set_msg_callback(ctx, ssl_sock_msgcbk);
 #endif
-#ifdef HAVE_OPENSSL_KEYLOG
+#ifdef HAVE_SSL_KEYLOG
 	SSL_CTX_set_keylog_callback(ctx, SSL_CTX_keylog);
 #endif
 
@@ -7051,7 +7051,7 @@
 	pool_free(pool_head_ssl_capture, ptr);
 }
 
-#ifdef HAVE_OPENSSL_KEYLOG
+#ifdef HAVE_SSL_KEYLOG
 static void ssl_sock_keylog_free_func(void *parent, void *ptr, CRYPTO_EX_DATA *ad, int idx, long argl, void *argp)
 {
 	struct ssl_keylog *keylog;
@@ -7118,7 +7118,7 @@
 
 	ssl_app_data_index = SSL_get_ex_new_index(0, NULL, NULL, NULL, NULL);
 	ssl_capture_ptr_index = SSL_get_ex_new_index(0, NULL, NULL, NULL, ssl_sock_capture_free_func);
-#ifdef HAVE_OPENSSL_KEYLOG
+#ifdef HAVE_SSL_KEYLOG
 	ssl_keylog_index = SSL_get_ex_new_index(0, NULL, NULL, NULL, ssl_sock_keylog_free_func);
 #endif
 #ifndef OPENSSL_NO_ENGINE