Places connection filter engine in a separated configuration

Different from the Rules or other options, the connections filters are applied
to entire server, not to a single vhost, or so. In order to keep it clear to
the user this patches adds "SecConnectionEngine" which works in the same way
that SecRuleEngine does.

Author: Felipe Zimmerle

apache2/apache2_config.c

@@ -2141,6 +2141,34 @@ static const char *cmd_rule(cmd_parms *cmd, void *_dcfg,
     return add_rule(cmd, (directory_config *)_dcfg, RULE_TYPE_NORMAL, p1, p2, p3);
 }
 
+static const char *cmd_sever_conn_filters_engine(cmd_parms *cmd, void *_dcfg,
+    const char *p1)
+{
+    directory_config *dcfg = (directory_config *)_dcfg;
+
+    if (dcfg == NULL) return NULL;
+
+    if (strcasecmp(p1, "on") == 0)
+    {
+        conn_limits_filter_state = MODSEC_ENABLED;
+    }
+    else if (strcasecmp(p1, "off") == 0)
+    {
+        conn_limits_filter_state = MODSEC_DISABLED;
+    }
+    else if (strcasecmp(p1, "detectiononly") == 0)
+    {
+        conn_limits_filter_state = MODSEC_DETECTION_ONLY;
+    }
+    else
+    {
+        return apr_psprintf(cmd->pool, "ModSecurity: Invalid value for " \
+                "SecConnectionEngine: %s", p1);
+    }
+
+    return NULL;
+}
+
 static const char *cmd_rule_engine(cmd_parms *cmd, void *_dcfg, const char *p1)
 {
     directory_config *dcfg = (directory_config *)_dcfg;
@@ -2167,8 +2195,6 @@ static const char *cmd_rule_engine(cmd_parms *cmd, void *_dcfg, const char *p1)
                 "SecRuleEngine: %s", p1);
     }
 
-    conn_limits_filter_state = dcfg->is_enabled;
-
     return NULL;
 }
 
@@ -3411,6 +3437,14 @@ const command_rec module_directives[] = {
         "On or Off"
     ),
 
+    AP_INIT_TAKE1 (
+        "SecConnectionEngine",
+        cmd_sever_conn_filters_engine,
+        NULL,
+        CMD_SCOPE_ANY,
+        "On or Off"
+    ),
+
     AP_INIT_TAKE1 (
         "SecXmlExternalEntity",
         cmd_xml_external_entity,

apache2/mod_security2.c

@@ -63,7 +63,7 @@ unsigned long int DSOLOCAL msc_pcre_match_limit_recursion = 0;
 
 int DSOLOCAL status_engine_state = STATUS_ENGINE_DISABLED;
 
-int DSOLOCAL conn_limits_filter_state = 0;
+int DSOLOCAL conn_limits_filter_state = MODSEC_DISABLED;
 
 unsigned long int DSOLOCAL conn_read_state_limit = 0;
 TreeRoot DSOLOCAL *conn_read_state_whitelist = 0;