/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <ngx_mail.h>
#include <ngx_mail_smtp_module.h>
static void *ngx_mail_smtp_create_srv_conf(ngx_conf_t *cf);
static char *ngx_mail_smtp_merge_srv_conf(ngx_conf_t *cf, void *parent,
void *child);
static ngx_conf_bitmask_t ngx_mail_smtp_auth_methods[] = {
{ ngx_string("plain"), NGX_MAIL_AUTH_PLAIN_ENABLED },
{ ngx_string("login"), NGX_MAIL_AUTH_LOGIN_ENABLED },
{ ngx_string("cram-md5"), NGX_MAIL_AUTH_CRAM_MD5_ENABLED },
{ ngx_string("external"), NGX_MAIL_AUTH_EXTERNAL_ENABLED },
{ ngx_string("none"), NGX_MAIL_AUTH_NONE_ENABLED },
{ ngx_null_string, 0 }
};
static ngx_str_t ngx_mail_smtp_auth_methods_names[] = {
ngx_string("PLAIN"),
ngx_string("LOGIN"),
ngx_null_string, /* APOP */
ngx_string("CRAM-MD5"),
ngx_string("EXTERNAL"),
ngx_null_string /* NONE */
};
static ngx_mail_protocol_t ngx_mail_smtp_protocol = {
ngx_string("smtp"),
ngx_string("\x04smtp"),
{ 25, 465, 587, 0 },
NGX_MAIL_SMTP_PROTOCOL,
ngx_mail_smtp_init_session,
ngx_mail_smtp_init_protocol,
ngx_mail_smtp_parse_command,
ngx_mail_smtp_auth_state,
ngx_string("451 4.3.2 Internal server error" CRLF),
ngx_string("421 4.7.1 SSL certificate error" CRLF),
ngx_string("421 4.7.1 No required SSL certificate" CRLF)
};
static ngx_command_t ngx_mail_smtp_commands[] = {
{ ngx_string("smtp_client_buffer"),
NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
ngx_conf_set_size_slot,
NGX_MAIL_SRV_CONF_OFFSET,
offsetof(ngx_mail_smtp_srv_conf_t, client_buffer_size),
NULL },
{ ngx_string("smtp_greeting_delay"),
NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
ngx_conf_set_msec_slot,
NGX_MAIL_SRV_CONF_OFFSET,
offsetof(ngx_mail_smtp_srv_conf_t, greeting_delay),
NULL },
{ ngx_string("smtp_capabilities"),
NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE,
ngx_mail_capabilities,
NGX_MAIL_SRV_CONF_OFFSET,
offsetof(ngx_mail_smtp_srv_conf_t, capabilities),
NULL },
{ ngx_string("smtp_auth"),
NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE,
ngx_conf_set_bitmask_slot,
NGX_MAIL_SRV_CONF_OFFSET,
offsetof(ngx_mail_smtp_srv_conf_t, auth_methods),
&ngx_mail_smtp_auth_methods },
ngx_null_command
};
static ngx_mail_module_t ngx_mail_smtp_module_ctx = {
&ngx_mail_smtp_protocol, /* protocol */
NULL, /* create main configuration */
NULL, /* init main configuration */
ngx_mail_smtp_create_srv_conf, /* create server configuration */
ngx_mail_smtp_merge_srv_conf /* merge server configuration */
};
ngx_module_t ngx_mail_smtp_module = {
NGX_MODULE_V1,
&ngx_mail_smtp_module_ctx, /* module context */
ngx_mail_smtp_commands, /* module directives */
NGX_MAIL_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
static void *
ngx_mail_smtp_create_srv_conf(ngx_conf_t *cf)
{
ngx_mail_smtp_srv_conf_t *sscf;
sscf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_smtp_srv_conf_t));
if (sscf == NULL) {
return NULL;
}
sscf->client_buffer_size = NGX_CONF_UNSET_SIZE;
sscf->greeting_delay = NGX_CONF_UNSET_MSEC;
if (ngx_array_init(&sscf->capabilities, cf->pool, 4, sizeof(ngx_str_t))
!= NGX_OK)
{
return NULL;
}
return sscf;
}
static char *
ngx_mail_smtp_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
{
ngx_mail_smtp_srv_conf_t *prev = parent;
ngx_mail_smtp_srv_conf_t *conf = child;
u_char *p, *auth, *last;
size_t size;
ngx_str_t *c;
ngx_uint_t i, m, auth_enabled;
ngx_mail_core_srv_conf_t *cscf;
ngx_conf_merge_size_value(conf->client_buffer_size,
prev->client_buffer_size,
(size_t) ngx_pagesize);
ngx_conf_merge_msec_value(conf->greeting_delay,
prev->greeting_delay, 0);
ngx_conf_merge_bitmask_value(conf->auth_methods,
prev->auth_methods,
(NGX_CONF_BITMASK_SET
|NGX_MAIL_AUTH_PLAIN_ENABLED
|NGX_MAIL_AUTH_LOGIN_ENABLED));
cscf = ngx_mail_conf_get_module_srv_conf(cf, ngx_mail_core_module);
size = sizeof("220 ESMTP ready" CRLF) - 1 + cscf->server_name.len;
p = ngx_pnalloc(cf->pool, size);
if (p == NULL) {
return NGX_CONF_ERROR;
}
conf->greeting.len = size;
conf->greeting.data = p;
*p++ = '2'; *p++ = '2'; *p++ = '0'; *p++ = ' ';
p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len);
ngx_memcpy(p, " ESMTP ready" CRLF, sizeof(" ESMTP ready" CRLF) - 1);
size = sizeof("250 " CRLF) - 1 + cscf->server_name.len;
p = ngx_pnalloc(cf->pool, size);
if (p == NULL) {
return NGX_CONF_ERROR;
}
conf->server_name.len = size;
conf->server_name.data = p;
*p++ = '2'; *p++ = '5'; *p++ = '0'; *p++ = ' ';
p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len);
*p++ = CR; *p = LF;
if (conf->capabilities.nelts == 0) {
conf->capabilities = prev->capabilities;
}
size = sizeof("250-") - 1 + cscf->server_name.len + sizeof(CRLF) - 1;
c = conf->capabilities.elts;
for (i = 0; i < conf->capabilities.nelts; i++) {
size += sizeof("250 ") - 1 + c[i].len + sizeof(CRLF) - 1;
}
auth_enabled = 0;
for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0;
m <= NGX_MAIL_AUTH_EXTERNAL_ENABLED;
m <<= 1, i++)
{
if (m & conf->auth_methods) {
size += 1 + ngx_mail_smtp_auth_methods_names[i].len;
auth_enabled = 1;
}
}
if (auth_enabled) {
size += sizeof("250 AUTH") - 1 + sizeof(CRLF) - 1;
}
p = ngx_pnalloc(cf->pool, size);
if (p == NULL) {
return NGX_CONF_ERROR;
}
conf->capability.len = size;
conf->capability.data = p;
last = p;
*p++ = '2'; *p++ = '5'; *p++ = '0'; *p++ = '-';
p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len);
*p++ = CR; *p++ = LF;
for (i = 0; i < conf->capabilities.nelts; i++) {
last = p;
*p++ = '2'; *p++ = '5'; *p++ = '0'; *p++ = '-';
p = ngx_cpymem(p, c[i].data, c[i].len);
*p++ = CR; *p++ = LF;
}
auth = p;
if (auth_enabled) {
last = p;
*p++ = '2'; *p++ = '5'; *p++ = '0'; *p++ = ' ';
*p++ = 'A'; *p++ = 'U'; *p++ = 'T'; *p++ = 'H';
for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0;
m <= NGX_MAIL_AUTH_EXTERNAL_ENABLED;
m <<= 1, i++)
{
if (m & conf->auth_methods) {
*p++ = ' ';
p = ngx_cpymem(p, ngx_mail_smtp_auth_methods_names[i].data,
ngx_mail_smtp_auth_methods_names[i].len);
}
}
*p++ = CR; *p = LF;
} else {
last[3] = ' ';
}
size += sizeof("250 STARTTLS" CRLF) - 1;
p = ngx_pnalloc(cf->pool, size);
if (p == NULL) {
return NGX_CONF_ERROR;
}
conf->starttls_capability.len = size;
conf->starttls_capability.data = p;
p = ngx_cpymem(p, conf->capability.data, conf->capability.len);
ngx_memcpy(p, "250 STARTTLS" CRLF, sizeof("250 STARTTLS" CRLF) - 1);
p = conf->starttls_capability.data
+ (last - conf->capability.data) + 3;
*p = '-';
size = (auth - conf->capability.data)
+ sizeof("250 STARTTLS" CRLF) - 1;
p = ngx_pnalloc(cf->pool, size);
if (p == NULL) {
return NGX_CONF_ERROR;
}
conf->starttls_only_capability.len = size;
conf->starttls_only_capability.data = p;
p = ngx_cpymem(p, conf->capability.data, auth - conf->capability.data);
ngx_memcpy(p, "250 STARTTLS" CRLF, sizeof("250 STARTTLS" CRLF) - 1);
if (last < auth) {
p = conf->starttls_only_capability.data
+ (last - conf->capability.data) + 3;
*p = '-';
}
return NGX_CONF_OK;
}
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