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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2009-2025 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 "pop3d.h"
#include <mailutils/sockaddr.h>
struct mu_tls_config global_tls_conf = { .handshake_timeout = 10 };
int global_tls_mode;
int global_conf_status = -1;
static struct pop3d_command command_table[] = {
{ "STLS", pop3d_stls },
{ "RETR", pop3d_retr },
{ "DELE", pop3d_dele },
{ "USER", pop3d_user },
{ "QUIT", pop3d_quit },
{ "APOP", pop3d_apop },
{ "AUTH", pop3d_auth },
{ "STAT", pop3d_stat },
{ "LIST", pop3d_list },
{ "NOOP", pop3d_noop },
{ "RSET", pop3d_rset },
{ "TOP", pop3d_top },
{ "UIDL", pop3d_uidl },
{ "CAPA", pop3d_capa },
{ NULL }
};
pop3d_command_handler_t
pop3d_find_command (const char *name)
{
struct pop3d_command *p;
for (p = command_table; p->name; p++)
{
if (mu_c_strcasecmp (name, p->name) == 0)
return p->handler;
}
return p->handler;
}
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
stls_server_check (struct pop3d_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_POP3S)
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
stls_preflight (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 pop3d_srv_config *cfg;
mu_iterator_current (itr, (void**) &ipsrv);
cfg = mu_ip_server_get_data (ipsrv);
switch (stls_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 (global_tls_mode == tls_unspecified)
global_tls_mode = tls_no;
if (tls_requested && !tls_ok)
{
mu_error (_("TLS is not configured, but requested in the "
"configuration"));
errors = 1;
}
if (errors)
return 1;
return 0;
}
static char *error_table[] = {
[ERR_WRONG_STATE] = "Incorrect state",
[ERR_BAD_ARGS] = "Invalid arguments",
[ERR_BAD_LOGIN] = "[AUTH] Bad login",
[ERR_NO_MESG] = "No such message",
[ERR_MESG_DELE] = "Message has been deleted",
[ERR_NOT_IMPL] = "Not implemented",
[ERR_BAD_CMD] = "Invalid command",
[ERR_MBOX_LOCK] = "[IN-USE] Mailbox in use",
[ERR_TOO_LONG] = "Argument too long",
[ERR_NO_MEM] = "Out of memory, quitting",
[ERR_SIGNAL] = "Quitting on signal",
[ERR_FILE] = "Some deleted messages not removed",
[ERR_NO_IFILE] = "No input stream",
[ERR_NO_OFILE] = "No output stream",
[ERR_IO] = "I/O error",
[ERR_PROTO] = "Remote protocol error",
[ERR_TIMEOUT] = "Session timed out",
[ERR_UNKNOWN] = "Unknown error",
[ERR_MBOX_SYNC] = "Mailbox was updated by other process",
[ERR_TLS_IO] = "TLS I/O error",
[ERR_LOGIN_DELAY] =
"[LOGIN-DELAY] Attempt to log in within the minimum login delay interval",
[ERR_TERMINATE] = "Terminating on request",
[ERR_SYS_LOGIN] = "[SYS/PERM] Cannot authenticate",
};
const char *
pop3d_error_string (int code)
{
if (code >= 0 && code < MU_ARRAY_SIZE (error_table) && error_table[code])
return error_table[code];
return "unknown error";
}
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