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Mail: max_errors directive.

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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.
This commit is contained in:
Maxim Dounin 2021-05-19 03:13:31 +03:00
parent ac3cf225a5
commit d326c76aae
3 changed files with 27 additions and 1 deletions
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3
src/mail/ngx_mail.h
View file

@ -115,6 +115,8 @@ typedef struct {
ngx_msec_t timeout;
ngx_msec_t resolver_timeout;
ngx_uint_t max_errors;
ngx_str_t server_name;
u_char *file_name;
@ -231,6 +233,7 @@ typedef struct {
ngx_uint_t command;
ngx_array_t args;
ngx_uint_t errors;
ngx_uint_t login_attempt;
/* used to parse POP3/IMAP/SMTP command */

10
src/mail/ngx_mail_core_module.c
View file

@ -85,6 +85,13 @@ static ngx_command_t ngx_mail_core_commands[] = {
offsetof(ngx_mail_core_srv_conf_t, resolver_timeout),
NULL },
{ ngx_string("max_errors"),
NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
ngx_conf_set_num_slot,
NGX_MAIL_SRV_CONF_OFFSET,
offsetof(ngx_mail_core_srv_conf_t, max_errors),
NULL },
ngx_null_command
};
@ -163,6 +170,8 @@ ngx_mail_core_create_srv_conf(ngx_conf_t *cf)
cscf->timeout = NGX_CONF_UNSET_MSEC;
cscf->resolver_timeout = NGX_CONF_UNSET_MSEC;
cscf->max_errors = NGX_CONF_UNSET_UINT;
cscf->resolver = NGX_CONF_UNSET_PTR;
cscf->file_name = cf->conf_file->file.name.data;
@ -182,6 +191,7 @@ ngx_mail_core_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
ngx_conf_merge_msec_value(conf->resolver_timeout, prev->resolver_timeout,
30000);
ngx_conf_merge_uint_value(conf->max_errors, prev->max_errors, 5);
ngx_conf_merge_str_value(conf->server_name, prev->server_name, "");

15
src/mail/ngx_mail_handler.c
View file

@ -874,7 +874,20 @@ ngx_mail_read_command(ngx_mail_session_t *s, ngx_connection_t *c)
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;
}