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/*
* Copyright (C) 2013 Martin Willi
* Copyright (C) 2013 revosec AG
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#include "sasl_plain.h"
#include <utils/debug.h>
typedef struct private_sasl_plain_t private_sasl_plain_t;
/**
* Private data of an sasl_plain_t object.
*/
struct private_sasl_plain_t {
/**
* Public sasl_plain_t interface.
*/
sasl_plain_t public;
/**
* Client identity
*/
identification_t *client;
};
METHOD(sasl_mechanism_t, get_name, char*,
private_sasl_plain_t *this)
{
return "PLAIN";
}
METHOD(sasl_mechanism_t, build_server, status_t,
private_sasl_plain_t *this, chunk_t *message)
{
/* gets never called */
return FAILED;
}
METHOD(sasl_mechanism_t, process_server, status_t,
private_sasl_plain_t *this, chunk_t message)
{
chunk_t authz, authi, password;
identification_t *id;
shared_key_t *shared;
u_char *pos;
pos = memchr(message.ptr, 0, message.len);
if (!pos)
{
DBG1(DBG_CFG, "invalid authz encoding");
return FAILED;
}
authz = chunk_create(message.ptr, pos - message.ptr);
message = chunk_skip(message, authz.len + 1);
pos = memchr(message.ptr, 0, message.len);
if (!pos)
{
DBG1(DBG_CFG, "invalid authi encoding");
return FAILED;
}
authi = chunk_create(message.ptr, pos - message.ptr);
password = chunk_skip(message, authi.len + 1);
id = identification_create_from_data(authi);
shared = lib->credmgr->get_shared(lib->credmgr, SHARED_EAP, id, NULL);
if (!shared)
{
DBG1(DBG_CFG, "no shared secret found for '%Y'", id);
id->destroy(id);
return FAILED;
}
if (!chunk_equals(shared->get_key(shared), password))
{
DBG1(DBG_CFG, "shared secret for '%Y' does not match", id);
id->destroy(id);
shared->destroy(shared);
return FAILED;
}
id->destroy(id);
shared->destroy(shared);
return SUCCESS;
}
METHOD(sasl_mechanism_t, build_client, status_t,
private_sasl_plain_t *this, chunk_t *message)
{
shared_key_t *shared;
chunk_t password;
char buf[256];
ssize_t len;
/* we currently use the EAP type of shared secret */
shared = lib->credmgr->get_shared(lib->credmgr, SHARED_EAP,
this->client, NULL);
if (!shared)
{
DBG1(DBG_CFG, "no shared secret found for %Y", this->client);
return FAILED;
}
password = shared->get_key(shared);
len = snprintf(buf, sizeof(buf), "%s%c%Y%c%.*s",
"", 0, this->client, 0,
(int)password.len, password.ptr);
if (len < 0 || len >= sizeof(buf))
{
return FAILED;
}
*message = chunk_clone(chunk_create(buf, len));
return NEED_MORE;
}
METHOD(sasl_mechanism_t, process_client, status_t,
private_sasl_plain_t *this, chunk_t message)
{
/* if the server sends a result, authentication successful */
return SUCCESS;
}
METHOD(sasl_mechanism_t, destroy, void,
private_sasl_plain_t *this)
{
DESTROY_IF(this->client);
free(this);
}
/**
* See header
*/
sasl_plain_t *sasl_plain_create(char *name, identification_t *client)
{
private_sasl_plain_t *this;
if (!streq(get_name(NULL), name))
{
return NULL;
}
INIT(this,
.public = {
.sasl = {
.get_name = _get_name,
.destroy = _destroy,
},
},
);
if (client)
{
this->public.sasl.build = _build_client;
this->public.sasl.process = _process_client;
this->client = client->clone(client);
}
else
{
this->public.sasl.build = _build_server;
this->public.sasl.process = _process_server;
}
return &this->public;
}
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