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/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <net/stpsession.h>
#include <libostp/session.h>
#include <crypto/aes.h>
#include <net/param.h>
#include <net/auth.h>
#include <otconfig.h>
#include <stdio.h>
static int
handle_pap(struct ostp_client *c, const struct pap *pap, const unsigned char *session_key)
{
int error = 0;
uint8_t attempts = 0;
struct pap tmp_pap = *pap;
const size_t LEN = sizeof(struct pap);
/* TODO: Support more SPW bits */
while (1) {
/* Quick session request, jump right in! */
if (ISSET(tmp_pap.spw, PAP_SPW_QSR)) {
printf("Got QSR, starting session...\n");
send_frame(c->sockfd, &tmp_pap, LEN, session_key);
return 0;
}
/* We have exhausted our attempts */
if (attempts >= ARBITRATION_MAX) {
printf("Too many arbitration attempts, bailing!\n");
return -1;
}
printf("Got bad SPW from client\n");
printf("Attempting arbitration...\n");
tmp_pap.spw = 0;
tmp_pap.code = PAP_BAD_SPW;
/* Send in PAP and wait for response */
if ((error = send_frame(c->sockfd, &tmp_pap, LEN, session_key)) < 0) {
printf("Failed to send PAP frame\n");
return -1;
}
if ((error = recv_frame(c->sockfd, LEN, session_key, &tmp_pap)) < 0) {
printf("Failed to recv PAP frame\n");
return error;
}
++attempts;
}
return 0;
}
int
negotiate_spw(struct ostp_client *c, unsigned char *session_key)
{
const size_t LEN = sizeof(struct pap);
struct pap pap;
int error;
/* Get PAP from the network */
if ((error = recv_frame(c->sockfd, LEN, session_key, &pap)) < 0) {
return error;
}
return handle_pap(c, &pap, session_key);
}
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