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/*
* Copyright (C) 2021-2022 Kevin J. McCarthy <kevin@8t8.us>
*
* 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.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include "mutt.h"
#include "account.h"
#include "mutt_sasl_gnu.h"
#include "mutt_socket.h"
#include <errno.h>
#include <gsasl.h>
static Gsasl *mutt_gsasl_ctx = NULL;
static int mutt_gsasl_callback (Gsasl *ctx, Gsasl_session *sctx,
Gsasl_property prop);
/* mutt_gsasl_start: called before doing a SASL exchange - initialises library
* (if necessary). */
static int mutt_gsasl_init (void)
{
int rc;
if (mutt_gsasl_ctx)
return 0;
rc = gsasl_init (&mutt_gsasl_ctx);
if (rc != GSASL_OK)
{
mutt_gsasl_ctx = NULL;
dprint (1, (debugfile,
"mutt_gsasl_start: libgsasl initialisation failed (%d): %s.\n",
rc, gsasl_strerror (rc)));
return -1;
}
gsasl_callback_set (mutt_gsasl_ctx, mutt_gsasl_callback);
return 0;
}
void mutt_gsasl_done (void)
{
if (mutt_gsasl_ctx)
{
gsasl_done (mutt_gsasl_ctx);
mutt_gsasl_ctx = NULL;
}
}
static const char *VALID_MECHANISM_CHARACTERS =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_";
/* This logic is derived from the libgsasl suggest code */
static int mechlist_contains (const char *uc_mech, const char *uc_mechlist)
{
size_t mech_len, mechlist_len, fragment_len, i;
mech_len = mutt_strlen (uc_mech);
mechlist_len = mutt_strlen (uc_mechlist);
if (!mech_len || !mechlist_len)
return 0;
for (i = 0; i < mechlist_len;)
{
fragment_len = strspn (uc_mechlist + i, VALID_MECHANISM_CHARACTERS);
if ((mech_len == fragment_len) &&
!ascii_strncmp (uc_mech, uc_mechlist + i, mech_len))
return 1;
i += fragment_len + 1;
}
return 0;
}
const char *mutt_gsasl_get_mech (const char *requested_mech,
const char *server_mechlist)
{
char *uc_requested_mech, *uc_server_mechlist;
const char *rv = NULL;
if (mutt_gsasl_init ())
return NULL;
/* libgsasl does not do case-independent string comparisons, and stores
* its methods internally in uppercase.
*/
uc_server_mechlist = safe_strdup (server_mechlist);
if (uc_server_mechlist)
ascii_strupper (uc_server_mechlist);
uc_requested_mech = safe_strdup (requested_mech);
if (uc_requested_mech)
ascii_strupper (uc_requested_mech);
if (uc_requested_mech)
{
if (mechlist_contains (uc_requested_mech, uc_server_mechlist))
rv = gsasl_client_suggest_mechanism (mutt_gsasl_ctx, uc_requested_mech);
}
else
rv = gsasl_client_suggest_mechanism (mutt_gsasl_ctx, uc_server_mechlist);
FREE (&uc_requested_mech);
FREE (&uc_server_mechlist);
return rv;
}
int mutt_gsasl_client_new (CONNECTION *conn, const char *mech,
Gsasl_session **sctx)
{
int rc;
if (mutt_gsasl_init ())
return -1;
rc = gsasl_client_start (mutt_gsasl_ctx, mech, sctx);
if (rc != GSASL_OK)
{
*sctx = NULL;
dprint (1, (debugfile,
"mutt_gsasl_client_new: gsasl_client_start failed (%d): %s.\n",
rc, gsasl_strerror (rc)));
return -1;
}
gsasl_session_hook_set (*sctx, conn);
return 0;
}
void mutt_gsasl_client_finish (Gsasl_session **sctx)
{
gsasl_finish (*sctx);
*sctx = NULL;
}
static int mutt_gsasl_callback (Gsasl *ctx, Gsasl_session *sctx,
Gsasl_property prop)
{
int rc = GSASL_NO_CALLBACK;
CONNECTION *conn;
const char* service;
conn = gsasl_session_hook_get (sctx);
if (!conn)
{
dprint (1, (debugfile, "mutt_gsasl_callback(): missing session hook data!\n"));
return rc;
}
switch (prop)
{
case GSASL_PASSWORD:
if (mutt_account_getpass (&conn->account))
return rc;
gsasl_property_set (sctx, GSASL_PASSWORD, conn->account.pass);
rc = GSASL_OK;
break;
case GSASL_AUTHID:
/* whom the provided password belongs to: login */
if (mutt_account_getlogin (&conn->account))
return rc;
gsasl_property_set (sctx, GSASL_AUTHID, conn->account.login);
rc = GSASL_OK;
break;
case GSASL_AUTHZID:
/* name of the user whose mail/resources you intend to access: user */
if (mutt_account_getuser (&conn->account))
return rc;
gsasl_property_set (sctx, GSASL_AUTHZID, conn->account.user);
rc = GSASL_OK;
break;
case GSASL_ANONYMOUS_TOKEN:
gsasl_property_set (sctx, GSASL_ANONYMOUS_TOKEN, "dummy");
rc = GSASL_OK;
break;
case GSASL_SERVICE:
switch (conn->account.type)
{
case MUTT_ACCT_TYPE_IMAP:
service = "imap";
break;
case MUTT_ACCT_TYPE_POP:
service = "pop";
break;
case MUTT_ACCT_TYPE_SMTP:
service = "smtp";
break;
default:
return rc;
}
gsasl_property_set (sctx, GSASL_SERVICE, service);
rc = GSASL_OK;
break;
case GSASL_HOSTNAME:
gsasl_property_set (sctx, GSASL_HOSTNAME, conn->account.host);
rc = GSASL_OK;
break;
default:
break;
}
return rc;
}
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