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/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
#include "submission-common.h"
#include "buffer.h"
#include "str.h"
#include "istream.h"
#include "ostream.h"
#include "array.h"
#include "base64.h"
#include "hostpid.h"
#include "path-util.h"
#include "process-title.h"
#include "restrict-access.h"
#include "fd-util.h"
#include "settings-parser.h"
#include "master-service.h"
#include "master-login.h"
#include "master-service-settings.h"
#include "master-interface.h"
#include "var-expand.h"
#include "mail-error.h"
#include "mail-user.h"
#include "mail-storage-service.h"
#include "smtp-server.h"
#include "smtp-client.h"
#include "submission-commands.h"
#include <stdio.h>
#include <unistd.h>
#define DNS_CLIENT_SOCKET_PATH "dns-client"
#define LMTP_MASTER_FIRST_LISTEN_FD 3
#define IS_STANDALONE() \
(getenv(MASTER_IS_PARENT_ENV) == NULL)
struct smtp_server *smtp_server = NULL;
struct smtp_client *smtp_client = NULL;
static bool verbose_proctitle = FALSE;
static struct mail_storage_service_ctx *storage_service;
static struct master_login *master_login = NULL;
submission_client_created_func_t *hook_client_created = NULL;
bool submission_debug = FALSE;
submission_client_created_func_t *
submission_client_created_hook_set(submission_client_created_func_t *new_hook)
{
submission_client_created_func_t *old_hook = hook_client_created;
hook_client_created = new_hook;
return old_hook;
}
void submission_refresh_proctitle(void)
{
struct client *client;
string_t *title = t_str_new(128);
if (!verbose_proctitle)
return;
str_append_c(title, '[');
switch (submission_client_count) {
case 0:
str_append(title, "idling");
break;
case 1:
client = submission_clients;
str_append(title, client->user->username);
if (client->user->conn.remote_ip != NULL) {
str_append_c(title, ' ');
str_append(title,
net_ip2addr(client->user->conn.remote_ip));
}
str_append_c(title, ' ');
str_append(title, smtp_server_state_names[client->state.state]);
if (client->state.args != NULL && *client->state.args != '\0') {
str_append_c(title, ' ');
str_append(title, client->state.args);
}
break;
default:
str_printfa(title, "%u connections", submission_client_count);
break;
}
str_append_c(title, ']');
process_title_set(str_c(title));
}
static void submission_die(void)
{
/* do nothing. submission connections typically die pretty quick anyway.
*/
}
static void
send_error(int fd_out, const char *hostname, const char *error_code,
const char *error_msg)
{
const char *msg;
msg = t_strdup_printf("451 %s %s\r\n"
"421 4.3.2 %s Shutting down due to fatal error\r\n",
error_code, error_msg, hostname);
if (write(fd_out, msg, strlen(msg)) < 0) {
if (errno != EAGAIN && errno != EPIPE)
i_error("write(client) failed: %m");
}
}
static bool
extract_input_data_field(const unsigned char **data, size_t *data_len,
const char **value_r)
{
size_t value_len = 0;
if (*data_len == 0)
return FALSE;
if (**data == '\0') {
value_len = 1;
} else {
*value_r = t_strndup(*data, *data_len);
value_len = strlen(*value_r) + 1;
}
if (value_len > *data_len) {
*data = &uchar_nul;
*data_len = 0;
} else {
*data = *data + value_len;
*data_len = *data_len - value_len;
}
return TRUE;
}
static int
client_create_from_input(const struct mail_storage_service_input *input,
enum mail_auth_request_flags login_flags,
int fd_in, int fd_out, const buffer_t *input_buf,
const char **error_r)
{
struct mail_storage_service_user *user;
struct mail_user *mail_user;
struct submission_settings *set;
bool no_greeting = HAS_ALL_BITS(login_flags,
MAIL_AUTH_REQUEST_FLAG_IMPLICIT);
const char *errstr;
const char *helo = NULL;
struct smtp_proxy_data proxy_data;
const unsigned char *data;
size_t data_len;
if (mail_storage_service_lookup_next(storage_service, input,
&user, &mail_user, error_r) <= 0) {
send_error(fd_out, my_hostname,
"4.7.0", MAIL_ERRSTR_CRITICAL_MSG);
return -1;
}
restrict_access_allow_coredumps(TRUE);
set = mail_storage_service_user_get_set(user)[1];
if (set->verbose_proctitle)
verbose_proctitle = TRUE;
if (settings_var_expand(&submission_setting_parser_info, set,
mail_user->pool, mail_user_var_expand_table(mail_user),
&errstr) <= 0) {
*error_r = t_strdup_printf("Failed to expand settings: %s", errstr);
send_error(fd_out, set->hostname,
"4.3.5", MAIL_ERRSTR_CRITICAL_MSG);
mail_user_deinit(&mail_user);
mail_storage_service_user_unref(&user);
return -1;
}
if (set->submission_relay_host == NULL ||
*set->submission_relay_host == '\0') {
*error_r = "No relay host configured for submission proxy "
"(submission_relay_host is unset)";
send_error(fd_out, set->hostname,
"4.3.5", MAIL_ERRSTR_CRITICAL_MSG);
mail_user_deinit(&mail_user);
mail_storage_service_user_unref(&user);
return -1;
}
/* parse input data */
data = NULL;
data_len = 0;
i_zero(&proxy_data);
if (input_buf != NULL && input_buf->used > 0) {
data = input_buf->data;
data_len = input_buf->used;
if (extract_input_data_field(&data, &data_len, &helo) &&
extract_input_data_field(&data, &data_len,
&proxy_data.helo)) {
/* nothing to do */
}
/* NOTE: actually, pipelining the AUTH command is stricly
speaking not allowed, but we support it anyway.
*/
}
(void)client_create(fd_in, fd_out, mail_user,
user, set, helo, &proxy_data, data, data_len,
no_greeting);
return 0;
}
static void main_stdio_run(const char *username)
{
struct mail_storage_service_input input;
buffer_t *input_buf;
const char *value, *error, *input_base64;
i_zero(&input);
input.module = input.service = "submission";
input.username = username != NULL ? username : getenv("USER");
if (input.username == NULL && IS_STANDALONE())
input.username = getlogin();
if (input.username == NULL)
i_fatal("USER environment missing");
if ((value = getenv("IP")) != NULL)
(void)net_addr2ip(value, &input.remote_ip);
if ((value = getenv("LOCAL_IP")) != NULL)
(void)net_addr2ip(value, &input.local_ip);
input_base64 = getenv("CLIENT_INPUT");
input_buf = input_base64 == NULL ? NULL :
t_base64_decode_str(input_base64);
if (client_create_from_input(&input, 0, STDIN_FILENO, STDOUT_FILENO,
input_buf, &error) < 0)
i_fatal("%s", error);
}
static void
login_client_connected(const struct master_login_client *login_client,
const char *username, const char *const *extra_fields)
{
struct mail_storage_service_input input;
enum mail_auth_request_flags flags = login_client->auth_req.flags;
const char *error;
buffer_t input_buf;
i_zero(&input);
input.module = input.service = "submission";
input.local_ip = login_client->auth_req.local_ip;
input.remote_ip = login_client->auth_req.remote_ip;
input.local_port = login_client->auth_req.local_port;
input.remote_port = login_client->auth_req.remote_port;
input.username = username;
input.userdb_fields = extra_fields;
input.session_id = login_client->session_id;
if ((flags & MAIL_AUTH_REQUEST_FLAG_CONN_SECURED) != 0)
input.conn_secured = TRUE;
if ((flags & MAIL_AUTH_REQUEST_FLAG_CONN_SSL_SECURED) != 0)
input.conn_ssl_secured = TRUE;
buffer_create_from_const_data(&input_buf, login_client->data,
login_client->auth_req.data_size);
if (client_create_from_input(&input, flags,
login_client->fd, login_client->fd,
&input_buf, &error) < 0) {
int fd = login_client->fd;
i_error("%s", error);
i_close_fd(&fd);
master_service_client_connection_destroyed(master_service);
}
}
static void login_client_failed(const struct master_login_client *client,
const char *errormsg)
{
const char *msg;
msg = t_strdup_printf("451 4.7.0 %s\r\n"
"421 4.3.2 %s Shutting down due to fatal error\r\n",
errormsg, my_hostname);
if (write(client->fd, msg, strlen(msg)) < 0) {
/* ignored */
}
}
static void client_connected(struct master_service_connection *conn)
{
/* when running standalone, we shouldn't even get here */
i_assert(master_login != NULL);
master_service_client_connection_accept(conn);
master_login_add(master_login, conn->fd);
}
int main(int argc, char *argv[])
{
static const struct setting_parser_info *set_roots[] = {
&submission_setting_parser_info,
NULL
};
struct master_login_settings login_set;
enum master_service_flags service_flags = 0;
enum mail_storage_service_flags storage_service_flags = 0;
struct smtp_server_settings smtp_server_set;
struct smtp_client_settings smtp_client_set;
const char *username = NULL, *auth_socket_path = "auth-master";
const char *tmp_socket_path;
const char *error;
int c;
i_zero(&login_set);
login_set.postlogin_timeout_secs = MASTER_POSTLOGIN_TIMEOUT_DEFAULT;
login_set.request_auth_token = TRUE;
if (IS_STANDALONE() && getuid() == 0 &&
net_getpeername(1, NULL, NULL) == 0) {
printf("421 5.3.5 The submission binary must not be started "
"from inetd, use submission-login instead.\r\n");
return 1;
}
if (IS_STANDALONE()) {
service_flags |= MASTER_SERVICE_FLAG_STANDALONE |
MASTER_SERVICE_FLAG_STD_CLIENT;
} else {
service_flags |= MASTER_SERVICE_FLAG_KEEP_CONFIG_OPEN;
}
master_service = master_service_init("submission", service_flags,
&argc, &argv, "a:Dt:u:");
while ((c = master_getopt(master_service)) > 0) {
switch (c) {
case 'a':
auth_socket_path = optarg;
break;
case 't':
if (str_to_uint(optarg,
&login_set.postlogin_timeout_secs) < 0 ||
login_set.postlogin_timeout_secs == 0)
i_fatal("Invalid -t parameter: %s", optarg);
break;
case 'u':
storage_service_flags |=
MAIL_STORAGE_SERVICE_FLAG_USERDB_LOOKUP;
username = optarg;
break;
case 'D':
submission_debug = TRUE;
break;
default:
return FATAL_DEFAULT;
}
}
if (t_abspath(auth_socket_path, &login_set.auth_socket_path,
&error) < 0) {
i_fatal("t_abspath(%s) failed: %s", auth_socket_path,
error);
}
if (argv[optind] != NULL) {
if (t_abspath(argv[optind],
&login_set.postlogin_socket_path, &error) < 0) {
i_fatal("t_abspath(%s) failed: %s",
argv[optind], error);
}
}
login_set.callback = login_client_connected;
login_set.failure_callback = login_client_failed;
master_service_set_die_callback(master_service, submission_die);
storage_service =
mail_storage_service_init(master_service,
set_roots, storage_service_flags);
/* initialize SMTP server */
i_zero(&smtp_server_set);
smtp_server_set.capabilities = SMTP_CAPABILITY_DSN;
smtp_server_set.protocol = SMTP_PROTOCOL_SMTP;
smtp_server_set.max_pipelined_commands = 5;
smtp_server_set.debug = submission_debug;
smtp_server_set.reason_code_module = "submission";
smtp_server = smtp_server_init(&smtp_server_set);
smtp_server_command_register(smtp_server, "BURL", cmd_burl, 0);
if (t_abspath(DNS_CLIENT_SOCKET_PATH, &tmp_socket_path, &error) < 0)
i_fatal("t_abspath(%s) failed: %s", DNS_CLIENT_SOCKET_PATH, error);
/* initialize SMTP client */
i_zero(&smtp_client_set);
smtp_client_set.my_hostname = my_hostdomain();
smtp_client_set.debug = submission_debug;
smtp_client_set.dns_client_socket_path = tmp_socket_path;
smtp_client = smtp_client_init(&smtp_client_set);
if (!IS_STANDALONE())
master_login = master_login_init(master_service, &login_set);
master_service_init_finish(master_service);
/* NOTE: login_set.*_socket_path are now invalid due to data stack
having been freed */
/* fake that we're running, so we know if client was destroyed
while handling its initial input */
io_loop_set_running(current_ioloop);
if (IS_STANDALONE()) {
T_BEGIN {
main_stdio_run(username);
} T_END;
} else {
io_loop_set_running(current_ioloop);
}
if (io_loop_is_running(current_ioloop))
master_service_run(master_service, client_connected);
clients_destroy_all();
smtp_client_deinit(&smtp_client);
smtp_server_deinit(&smtp_server);
if (master_login != NULL)
master_login_deinit(&master_login);
mail_storage_service_deinit(&storage_service);
master_service_deinit(&master_service);
return 0;
}
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