File httpd-2.4.18-sslmultiproxy.patch of Package httpd-2.4.43

diff --git a/modules/ssl/mod_ssl.c b/modules/ssl/mod_ssl.c
index 717a694..a3ce718 100644
--- a/modules/ssl/mod_ssl.c
+++ b/modules/ssl/mod_ssl.c
@@ -395,6 +395,9 @@ static SSLConnRec *ssl_init_connection_ctx(conn_rec *c)
     return sslconn;
 }
 
+static typeof(ssl_proxy_enable) *othermod_proxy_enable;
+static typeof(ssl_engine_disable) *othermod_engine_disable;
+
 int ssl_proxy_enable(conn_rec *c)
 {
     SSLSrvConfigRec *sc;
@@ -403,6 +406,12 @@ int ssl_proxy_enable(conn_rec *c)
     sc = mySrvConfig(sslconn->server);
 
     if (!sc->proxy_enabled) {
+        if (othermod_proxy_enable) {
+            ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c,
+                          "mod_ssl proxy not configured, passing through to other module.");
+            return othermod_proxy_enable(c);
+        }
+
         ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(01961)
                       "SSL Proxy requested for %s but not enabled "
                       "[Hint: SSLProxyEngine]", sc->vhost_id);
@@ -422,6 +431,10 @@ int ssl_engine_disable(conn_rec *c)
 
     SSLConnRec *sslconn = myConnConfig(c);
 
+    if (othermod_engine_disable) {
+        othermod_engine_disable(c);
+    }
+
     if (sslconn) {
         sc = mySrvConfig(sslconn->server);
     }
@@ -621,6 +634,9 @@ static void ssl_register_hooks(apr_pool_t *p)
     ap_hook_post_read_request(ssl_hook_ReadReq, pre_prr,NULL, APR_HOOK_MIDDLE);
 
     ssl_var_register(p);
+    
+    othermod_proxy_enable = APR_RETRIEVE_OPTIONAL_FN(ssl_proxy_enable);
+    othermod_engine_disable = APR_RETRIEVE_OPTIONAL_FN(ssl_engine_disable);
 
     APR_REGISTER_OPTIONAL_FN(ssl_proxy_enable);
     APR_REGISTER_OPTIONAL_FN(ssl_engine_disable);
diff --git a/modules/ssl/ssl_engine_vars.c b/modules/ssl/ssl_engine_vars.c
index a6b0d0d..24fd8c7 100644
--- a/modules/ssl/ssl_engine_vars.c
+++ b/modules/ssl/ssl_engine_vars.c
@@ -54,6 +54,8 @@ static char *ssl_var_lookup_ssl_cipher(apr_pool_t *p, SSLConnRec *sslconn, char
 static void  ssl_var_lookup_ssl_cipher_bits(SSL *ssl, int *usekeysize, int *algkeysize);
 static char *ssl_var_lookup_ssl_version(apr_pool_t *p, char *var);
 static char *ssl_var_lookup_ssl_compress_meth(SSL *ssl);
+static APR_OPTIONAL_FN_TYPE(ssl_is_https) *othermod_is_https;
+static APR_OPTIONAL_FN_TYPE(ssl_var_lookup) *othermod_var_lookup;
 
 static SSLConnRec *ssl_get_effective_config(conn_rec *c)
 {
@@ -68,7 +70,9 @@ static SSLConnRec *ssl_get_effective_config(conn_rec *c)
 static int ssl_is_https(conn_rec *c)
 {
     SSLConnRec *sslconn = ssl_get_effective_config(c);
-    return sslconn && sslconn->ssl;
+
+    return (sslconn && sslconn->ssl)
+        || (othermod_is_https && othermod_is_https(c));
 }
 
 static const char var_interface[] = "mod_ssl/" AP_SERVER_BASEREVISION;
@@ -137,6 +141,9 @@ void ssl_var_register(apr_pool_t *p)
 {
     char *cp, *cp2;
 
+    othermod_is_https = APR_RETRIEVE_OPTIONAL_FN(ssl_is_https);
+    othermod_var_lookup = APR_RETRIEVE_OPTIONAL_FN(ssl_var_lookup);
+
     APR_REGISTER_OPTIONAL_FN(ssl_is_https);
     APR_REGISTER_OPTIONAL_FN(ssl_var_lookup);
     APR_REGISTER_OPTIONAL_FN(ssl_ext_list);
@@ -272,6 +279,15 @@ char *ssl_var_lookup(apr_pool_t *p, server_rec *s, conn_rec *c, request_rec *r,
      */
     if (result == NULL && c != NULL) {
         SSLConnRec *sslconn = ssl_get_effective_config(c);
+
+        if (strlen(var) > 4 && strcEQn(var, "SSL_", 4)
+            && (!sslconn || !sslconn->ssl) && othermod_var_lookup) {
+            /* For an SSL_* variable, if mod_ssl is not enabled for
+             * this connection and another SSL module is present, pass
+             * through to that module. */
+            return othermod_var_lookup(p, s, c, r, var);
+        }
+
         if (strlen(var) > 4 && strcEQn(var, "SSL_", 4)
             && sslconn && sslconn->ssl)
             result = ssl_var_lookup_ssl(p, sslconn, r, var+4);