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/*
fe-sasl.c : irssi
Copyright (C) 2015 The Lemon Man
This program 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 2 of the License, or
(at your option) any later version.
This program 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 this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "module.h"
#include "misc.h"
#include "settings.h"
#include "irc-cap.h"
#include "irc-servers.h"
#include "sasl.h"
#define SASL_TIMEOUT (20 * 1000) // ms
static gboolean sasl_timeout(IRC_SERVER_REC *server)
{
/* The authentication timed out, we can't do much beside terminating it */
irc_send_cmd_now(server, "AUTHENTICATE *");
cap_finish_negotiation(server);
server->sasl_timeout = -1;
signal_emit("server sasl failure", 2, server, "The authentication timed out");
return FALSE;
}
static void sasl_start(IRC_SERVER_REC *server, const char *data, const char *from)
{
IRC_SERVER_CONNECT_REC *conn;
conn = server->connrec;
switch (conn->sasl_mechanism) {
case SASL_MECHANISM_PLAIN:
irc_send_cmd_now(server, "AUTHENTICATE PLAIN");
break;
case SASL_MECHANISM_EXTERNAL:
irc_send_cmd_now(server, "AUTHENTICATE EXTERNAL");
break;
}
server->sasl_timeout = g_timeout_add(SASL_TIMEOUT, (GSourceFunc) sasl_timeout, server);
}
static void sasl_fail(IRC_SERVER_REC *server, const char *data, const char *from)
{
char *params, *error;
/* Stop any pending timeout, if any */
if (server->sasl_timeout != -1) {
g_source_remove(server->sasl_timeout);
server->sasl_timeout = -1;
}
params = event_get_params(data, 2, NULL, &error);
signal_emit("server sasl fail", 2, server, error);
/* Terminate the negotiation */
cap_finish_negotiation(server);
g_free(params);
}
static void sasl_already(IRC_SERVER_REC *server, const char *data, const char *from)
{
if (server->sasl_timeout != -1) {
g_source_remove(server->sasl_timeout);
server->sasl_timeout = -1;
}
signal_emit("server sasl success", 1, server);
/* We're already authenticated, do nothing */
cap_finish_negotiation(server);
}
static void sasl_success(IRC_SERVER_REC *server, const char *data, const char *from)
{
if (server->sasl_timeout != -1) {
g_source_remove(server->sasl_timeout);
server->sasl_timeout = -1;
}
signal_emit("server sasl success", 1, server);
/* The authentication succeeded, time to finish the CAP negotiation */
cap_finish_negotiation(server);
}
static void sasl_step(IRC_SERVER_REC *server, const char *data, const char *from)
{
IRC_SERVER_CONNECT_REC *conn;
GString *req;
char *enc_req;
conn = server->connrec;
/* Stop the timer */
if (server->sasl_timeout != -1) {
g_source_remove(server->sasl_timeout);
server->sasl_timeout = -1;
}
switch (conn->sasl_mechanism) {
case SASL_MECHANISM_PLAIN:
/* At this point we assume that conn->sasl_{username, password} are non-NULL.
* The PLAIN mechanism expects a NULL-separated string composed by the authorization identity, the
* authentication identity and the password.
* The authorization identity field is explicitly set to the user provided username.
* The whole request is then encoded in base64. */
req = g_string_new(NULL);
g_string_append(req, conn->sasl_username);
g_string_append_c(req, '\0');
g_string_append(req, conn->sasl_username);
g_string_append_c(req, '\0');
g_string_append(req, conn->sasl_password);
enc_req = g_base64_encode((const guchar *)req->str, req->len);
irc_send_cmdv(server, "AUTHENTICATE %s", enc_req);
g_free(enc_req);
g_string_free(req, TRUE);
break;
case SASL_MECHANISM_EXTERNAL:
/* Empty response */
irc_send_cmdv(server, "+");
break;
}
/* We expect a response within a reasonable time */
server->sasl_timeout = g_timeout_add(SASL_TIMEOUT, (GSourceFunc) sasl_timeout, server);
}
void sasl_init(void)
{
signal_add_first("server cap ack sasl", (SIGNAL_FUNC) sasl_start);
signal_add_first("event authenticate", (SIGNAL_FUNC) sasl_step);
signal_add_first("event 903", (SIGNAL_FUNC) sasl_success);
signal_add_first("event 902", (SIGNAL_FUNC) sasl_fail);
signal_add_first("event 904", (SIGNAL_FUNC) sasl_fail);
signal_add_first("event 905", (SIGNAL_FUNC) sasl_fail);
signal_add_first("event 906", (SIGNAL_FUNC) sasl_fail);
signal_add_first("event 907", (SIGNAL_FUNC) sasl_already);
}
void sasl_deinit(void)
{
signal_remove("server cap ack sasl", (SIGNAL_FUNC) sasl_start);
signal_remove("event authenticate", (SIGNAL_FUNC) sasl_step);
signal_remove("event 903", (SIGNAL_FUNC) sasl_success);
signal_remove("event 902", (SIGNAL_FUNC) sasl_fail);
signal_remove("event 904", (SIGNAL_FUNC) sasl_fail);
signal_remove("event 905", (SIGNAL_FUNC) sasl_fail);
signal_remove("event 906", (SIGNAL_FUNC) sasl_fail);
signal_remove("event 907", (SIGNAL_FUNC) sasl_already);
}
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