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/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
#include "login-common.h"
#include "base64.h"
#include "buffer.h"
#include "ioloop.h"
#include "istream.h"
#include "ostream.h"
#include "randgen.h"
#include "hostpid.h"
#include "safe-memset.h"
#include "str.h"
#include "strescape.h"
#include "master-service.h"
#include "master-service-ssl-settings.h"
#include "client.h"
#include "client-authenticate.h"
#include "auth-client.h"
#include "submission-proxy.h"
#include "submission-login-settings.h"
/* Disconnect client when it sends too many bad commands */
#define CLIENT_MAX_BAD_COMMANDS 10
static const struct smtp_server_callbacks smtp_callbacks;
static struct smtp_server *smtp_server = NULL;
static int submission_login_start_tls(void *conn_ctx,
struct istream **input, struct ostream **output)
{
struct submission_client *subm_client = conn_ctx;
struct client *client = &subm_client->common;
client->starttls = TRUE;
if (client_init_ssl(client) < 0) {
client_notify_disconnect(client,
CLIENT_DISCONNECT_INTERNAL_ERROR,
"TLS initialization failed.");
client_destroy(client,
"Disconnected: TLS initialization failed.");
return -1;
}
login_refresh_proctitle();
*input = client->input;
*output = client->output;
return 0;
}
static struct client *submission_client_alloc(pool_t pool)
{
struct submission_client *subm_client;
subm_client = p_new(pool, struct submission_client, 1);
return &subm_client->common;
}
static void submission_client_create(struct client *client,
void **other_sets)
{
static const char *const xclient_extensions[] =
{ "SESSION", "FORWARD", NULL };
struct submission_client *subm_client =
container_of(client, struct submission_client, common);
struct smtp_server_settings smtp_set;
subm_client->set = other_sets[0];
i_zero(&smtp_set);
smtp_set.capabilities = SMTP_CAPABILITY_SIZE |
SMTP_CAPABILITY_ENHANCEDSTATUSCODES | SMTP_CAPABILITY_AUTH |
SMTP_CAPABILITY_XCLIENT;
if (client_is_tls_enabled(client))
smtp_set.capabilities |= SMTP_CAPABILITY_STARTTLS;
smtp_set.hostname = subm_client->set->hostname;
smtp_set.login_greeting = client->set->login_greeting;
smtp_set.tls_required = !client->secured &&
(strcmp(client->ssl_set->ssl, "required") == 0);
smtp_set.xclient_extensions = xclient_extensions;
smtp_set.debug = client->set->auth_debug;
subm_client->conn = smtp_server_connection_create_from_streams(
smtp_server, client->input, client->output,
&client->real_remote_ip, client->real_remote_port,
&smtp_set, &smtp_callbacks, subm_client);
}
static void submission_client_destroy(struct client *client)
{
struct submission_client *subm_client =
container_of(client, struct submission_client, common);
if (subm_client->conn != NULL)
smtp_server_connection_close(&subm_client->conn, NULL);
i_free_and_null(subm_client->proxy_xclient);
}
static void submission_client_notify_auth_ready(struct client *client)
{
struct submission_client *subm_client =
container_of(client, struct submission_client, common);
smtp_server_connection_start(subm_client->conn);
}
static void
submission_client_notify_disconnect(struct client *_client,
enum client_disconnect_reason reason,
const char *text)
{
struct submission_client *client =
container_of(_client, struct submission_client, common);
struct smtp_server_connection *conn;
conn = client->conn;
client->conn = NULL;
if (conn != NULL) {
switch (reason) {
case CLIENT_DISCONNECT_TIMEOUT:
smtp_server_connection_terminate(&conn, "4.4.2", text);
break;
case CLIENT_DISCONNECT_SYSTEM_SHUTDOWN:
smtp_server_connection_terminate(&conn, "4.3.2", text);
break;
case CLIENT_DISCONNECT_INTERNAL_ERROR:
default:
smtp_server_connection_terminate(&conn, "4.0.0", text);
break;
}
}
}
static void
client_connection_cmd_xclient(void *context,
struct smtp_server_cmd_ctx *cmd,
struct smtp_proxy_data *data)
{
unsigned int i;
struct submission_client *client = context;
client->common.ip = data->source_ip;
client->common.remote_port = data->source_port;
client->common.proxy_ttl = data->ttl_plus_1;
for (i = 0; i < data->extra_fields_count; i++) {
const char *name = data->extra_fields[i].name;
const char *value = data->extra_fields[i].value;
if (strcasecmp(name, "FORWARD") == 0) {
size_t value_len = strlen(value);
if (client->common.forward_fields != NULL) {
str_truncate(client->common.forward_fields, 0);
} else {
client->common.forward_fields = str_new(
client->common.preproxy_pool,
MAX_BASE64_DECODED_SIZE(value_len));
if (base64_decode(value, value_len, NULL,
client->common.forward_fields) < 0) {
smtp_server_reply(cmd, 501, "5.5.4",
"Invalid FORWARD parameter");
}
}
} else if (strcasecmp(name, "SESSION") == 0) {
if (client->common.session_id != NULL)
continue;
client->common.session_id =
p_strdup(client->common.pool, value);
}
}
}
static void client_connection_disconnect(void *context, const char *reason)
{
struct submission_client *client = context;
client->pending_auth = NULL;
client_disconnect(&client->common, reason);
}
static void client_connection_destroy(void *context)
{
struct submission_client *client = context;
if (client->conn == NULL)
return;
client->conn = NULL;
client_destroy(&client->common, NULL);
}
static bool client_connection_is_trusted(void *context)
{
struct submission_client *client = context;
return client->common.trusted;
}
static void submission_login_die(void)
{
/* do nothing. submission connections typically die pretty quick anyway.
*/
}
static void submission_login_preinit(void)
{
login_set_roots = submission_login_setting_roots;
}
static void submission_login_init(void)
{
struct smtp_server_settings smtp_server_set;
/* override the default login_die() */
master_service_set_die_callback(master_service, submission_login_die);
/* initialize SMTP server */
i_zero(&smtp_server_set);
smtp_server_set.protocol = SMTP_PROTOCOL_SMTP;
smtp_server_set.max_pipelined_commands = 5;
smtp_server_set.max_bad_commands = CLIENT_MAX_BAD_COMMANDS;
smtp_server = smtp_server_init(&smtp_server_set);
}
static void submission_login_deinit(void)
{
clients_destroy_all();
smtp_server_deinit(&smtp_server);
}
static const struct smtp_server_callbacks smtp_callbacks = {
.conn_cmd_helo = cmd_helo,
.conn_start_tls = submission_login_start_tls,
.conn_cmd_auth = cmd_auth,
.conn_cmd_auth_continue = cmd_auth_continue,
.conn_cmd_xclient = client_connection_cmd_xclient,
.conn_disconnect = client_connection_disconnect,
.conn_destroy = client_connection_destroy,
.conn_is_trusted = client_connection_is_trusted
};
static struct client_vfuncs submission_client_vfuncs = {
submission_client_alloc,
submission_client_create,
submission_client_destroy,
submission_client_notify_auth_ready,
submission_client_notify_disconnect,
NULL,
NULL,
NULL,
NULL,
submission_client_auth_send_challenge,
NULL,
submission_client_auth_result,
submission_proxy_reset,
submission_proxy_parse_line,
submission_proxy_error,
submission_proxy_get_state,
NULL,
NULL,
NULL
};
static const struct login_binary submission_login_binary = {
.protocol = "submission",
.process_name = "submission-login",
.default_port = 587,
.client_vfuncs = &submission_client_vfuncs,
.preinit = submission_login_preinit,
.init = submission_login_init,
.deinit = submission_login_deinit,
.sasl_support_final_reply = FALSE
};
int main(int argc, char *argv[])
{
return login_binary_run(&submission_login_binary, argc, argv);
}
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