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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2003-2025 Free Software Foundation, Inc.
GNU Mailutils is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Mailutils is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
#include "imap4d.h"
#include <mailutils/sockaddr.h>
static int global_conf_status = -1;
int global_tls_mode;
struct mu_tls_config global_tls_conf = { .handshake_timeout = 10 };
/*
6.2.1. STARTTLS Command
Arguments: none
Responses: no specific response for this command
Result: OK - starttls completed, begin TLS negotiation
BAD - command unknown or arguments invalid
*/
int
imap4d_starttls (struct imap4d_session *session,
struct imap4d_command *command, imap4d_tokbuf_t tok)
{
int status;
if (session->tls_mode == tls_no)
return io_completion_response (command, RESP_BAD, "Invalid command");
if (imap4d_tokbuf_argc (tok) != 2)
return io_completion_response (command, RESP_BAD, "Invalid arguments");
status = io_completion_response (command, RESP_OK, "Begin TLS negotiation");
io_flush ();
if (imap4d_init_tls_server (session->tls_conf) == 0)
tls_encryption_on (session);
else
{
mu_diag_output (MU_DIAG_ERROR, _("session terminated"));
util_bye ();
exit (EX_OK);
}
return status;
}
void
tls_encryption_on (struct imap4d_session *session)
{
session->tls_mode = tls_no;
imap4d_capability_remove (IMAP_CAPA_STARTTLS);
login_disabled = 0;
imap4d_capability_remove (IMAP_CAPA_LOGINDISABLED);
imap4d_capability_remove (IMAP_CAPA_XTLSREQUIRED);
}
static int
global_tls_status (void)
{
if (global_conf_status == -1)
{
if (global_tls_conf.cert_file)
global_conf_status = mu_tls_config_check (&global_tls_conf, 1);
else
global_conf_status = MU_TLS_CONFIG_NULL;
if (global_conf_status != MU_TLS_CONFIG_OK)
global_tls_mode = tls_no;
}
return global_conf_status;
}
int
starttls_server_check (struct imap4d_srv_config *cfg, char const *srvid)
{
int result;
switch (cfg->tls_mode)
{
case tls_unspecified:
{
if (cfg->tls_conf.cert_file || global_tls_status () == MU_TLS_CONFIG_OK)
{
struct mu_sockaddr *sa;
int port = -1;
mu_ip_server_get_sockaddr (cfg->m_cfg.tcpsrv, &sa);
mu_sockaddr_get_port (sa, &port);
mu_sockaddr_free (sa);
if (port == PORT_IMAP4S)
cfg->tls_mode = tls_connection;
else if (global_tls_mode != tls_unspecified)
cfg->tls_mode = global_tls_mode;
else
cfg->tls_mode = tls_ondemand;
break;
}
}
/* fall through */
case tls_no:
return MU_TLS_CONFIG_NULL;
default:
break;
}
result = mu_tls_config_check (&cfg->tls_conf, 1);
switch (result)
{
case MU_TLS_CONFIG_OK:
if (!cfg->tls_conf.cert_file)
{
mu_error (_("server %s: no certificate set"), srvid);
result = MU_TLS_CONFIG_FAIL;
}
break;
case MU_TLS_CONFIG_NULL:
if (global_tls_status () == MU_TLS_CONFIG_OK)
{
cfg->tls_conf = global_tls_conf;
result = MU_TLS_CONFIG_OK;
}
else
{
mu_error (_("server %s: no certificate set"), srvid);
result = MU_TLS_CONFIG_FAIL;
}
break;
default:
mu_error (_("server %s: TLS configuration failed"), srvid);
}
return result;
}
int
starttls_init (mu_m_server_t msrv)
{
mu_list_t srvlist;
mu_iterator_t itr;
int errors = 0;
int tls_ok = mu_init_tls_libs ();
int tls_requested = 0;
mu_m_server_get_srvlist (msrv, &srvlist);
mu_list_get_iterator (srvlist, &itr);
for (mu_iterator_first (itr); !mu_iterator_is_done (itr); mu_iterator_next (itr))
{
mu_ip_server_t ipsrv;
struct imap4d_srv_config *cfg;
mu_iterator_current (itr, (void**) &ipsrv);
cfg = mu_ip_server_get_data (ipsrv);
switch (starttls_server_check (cfg, mu_ip_server_addrstr (ipsrv)))
{
case MU_TLS_CONFIG_NULL:
continue;
case MU_TLS_CONFIG_OK:
break;
default:
errors = 1;
}
tls_requested = 1;
}
mu_iterator_destroy (&itr);
if (tls_requested && !tls_ok)
{
mu_error (_("TLS is not configured, but requested in the "
"configuration"));
errors = 1;
}
if (errors)
return 1;
return 0;
}
/* EOF */
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