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/*
* Copyright (C) 1999-2001,2005 Brendan Cully <brendan@kublai.com>
* Copyright (C) 2018 Brandon Long <blong@fiction.net>
*
* 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.
*/
/* IMAP login/authentication code */
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include "mutt.h"
#include "imap_private.h"
#include "auth.h"
/* imap_auth_oauth: AUTH=OAUTHBEARER support. See RFC 7628 */
imap_auth_res_t imap_auth_oauth (IMAP_DATA* idata, const char* method)
{
char* ibuf = NULL;
char* oauth_buf = NULL;
int len, ilen, oalen;
int rc;
/* For now, we only support SASL_IR also and over TLS */
if (!mutt_bit_isset (idata->capabilities, AUTH_OAUTHBEARER) ||
!mutt_bit_isset (idata->capabilities, SASL_IR) ||
!idata->conn->ssf)
return IMAP_AUTH_UNAVAIL;
mutt_message _("Authenticating (OAUTHBEARER)...");
/* get auth info */
if (mutt_account_getlogin (&idata->conn->account))
return IMAP_AUTH_FAILURE;
/* We get the access token from the "imap_pass" field */
if (mutt_account_getpass (&idata->conn->account))
return IMAP_AUTH_FAILURE;
/* Determine the length of the keyed message digest, add 50 for
* overhead.
*/
oalen = strlen (idata->conn->account.user) +
strlen (idata->conn->account.host) +
strlen (idata->conn->account.pass) + 50;
oauth_buf = safe_malloc (oalen);
snprintf (oauth_buf, oalen,
"n,a=%s,\001host=%s\001port=%d\001auth=Bearer %s\001\001",
idata->conn->account.user, idata->conn->account.host,
idata->conn->account.port, idata->conn->account.pass);
/* ibuf must be long enough to store the base64 encoding of
* oauth_buf, plus the additional debris.
*/
ilen = strlen (oauth_buf) * 2 + 30;
ibuf = safe_malloc (ilen);
ibuf[0] = '\0';
safe_strcat (ibuf, ilen, "AUTHENTICATE OAUTHBEARER ");
len = strlen(ibuf);
mutt_to_base64 ((unsigned char*) (ibuf + len),
(unsigned char*) oauth_buf, strlen (oauth_buf),
ilen - len);
/* This doesn't really contain a password, but the token is good for
* an hour, so suppress it anyways.
*/
rc = imap_exec (idata, ibuf, IMAP_CMD_FAIL_OK | IMAP_CMD_PASS);
FREE (&oauth_buf);
FREE (&ibuf);
if (!rc)
{
mutt_clear_error();
return IMAP_AUTH_SUCCESS;
}
/* The error response was in SASL continuation, so "continue" the SASL
* to cause a failure and exit SASL input.
*/
mutt_socket_write (idata->conn, "an noop\r\n");
mutt_error _("OAUTHBEARER authentication failed.");
mutt_sleep (2);
return IMAP_AUTH_FAILURE;
}
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