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diff src/mail/ngx_mail_handler.c @ 7844:ec1071830799

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Mail: max_errors directive. Similarly to smtpd_hard_error_limit in Postfix and smtp_max_unknown_commands in Exim, specifies the number of errors after which the connection is closed.
author Maxim Dounin <mdounin@mdounin.ru>
date Wed, 19 May 2021 03:13:31 +0300
parents 2851e4c7de03
children 0aaa09927703
line wrap: on
line diff
--- a/src/mail/ngx_mail_handler.c
+++ b/src/mail/ngx_mail_handler.c
@@ -874,7 +874,20 @@ ngx_mail_read_command(ngx_mail_session_t
         return NGX_MAIL_PARSE_INVALID_COMMAND;
     }
 
-    if (rc == NGX_IMAP_NEXT || rc == NGX_MAIL_PARSE_INVALID_COMMAND) {
+    if (rc == NGX_MAIL_PARSE_INVALID_COMMAND) {
+
+        s->errors++;
+
+        if (s->errors >= cscf->max_errors) {
+            ngx_log_error(NGX_LOG_INFO, c->log, 0,
+                          "client sent too many invalid commands");
+            s->quit = 1;
+        }
+
+        return rc;
+    }
+
+    if (rc == NGX_IMAP_NEXT) {
         return rc;
     }