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/* -*- mode:c; tab-width:8; c-basic-offset:8; indent-tabs-mode:nil; -*- */
/*
Copyright (C) 2019 by Ronnie Sahlberg <ronniesahlberg@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_SYS_UIO_H
#include <sys/uio.h>
#endif
#ifdef HAVE_SYS__IOVEC_H
#include <sys/_iovec.h>
#endif
#ifdef HAVE_TIME_H
#include <time.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#include <stdio.h>
#include "compat.h"
#include "portable-endian.h"
#include "aes128ccm.h"
#include "slist.h"
#include "smb2.h"
#include "libsmb2.h"
#include "libsmb2-raw.h"
#include "libsmb2-private.h"
#include "smb3-seal.h"
static const char xfer[4] = {0xFD, 'S', 'M', 'B'};
int
smb3_encrypt_pdu(struct smb2_context *smb2,
struct smb2_pdu *pdu)
{
struct smb2_pdu *tmp_pdu;
uint32_t spl, u32;
int i;
uint16_t u16;
if (!smb2->seal) {
return 0;
}
if (!pdu->seal) {
return 0;
}
spl = 52; /* transform header */
for (tmp_pdu = pdu; tmp_pdu; tmp_pdu = tmp_pdu->next_compound) {
for (i = 0; i < tmp_pdu->out.niov; i++) {
spl += (uint32_t)tmp_pdu->out.iov[i].len;
}
}
pdu->crypt = calloc(spl, sizeof(uint8_t));
if (pdu->crypt == NULL) {
pdu->seal = 0;
return -1;
}
memcpy(&pdu->crypt[0], xfer, 4);
for (i = 20; i < 31; i++) {
pdu->crypt[i] = random()&0xff;
}
u32 = htole32(spl - 52);
memcpy(&pdu->crypt[36], &u32, 4);
u16 = htole16(SMB_ENCRYPTION_AES128_CCM);
memcpy(&pdu->crypt[42], &u16, 2);
memcpy(&pdu->crypt[44], &smb2->session_id, 8);
spl = 52; /* transform header */
for (tmp_pdu = pdu; tmp_pdu; tmp_pdu = tmp_pdu->next_compound) {
for (i = 0; i < tmp_pdu->out.niov; i++) {
memcpy(&pdu->crypt[spl], tmp_pdu->out.iov[i].buf,
tmp_pdu->out.iov[i].len);
spl += (uint32_t)tmp_pdu->out.iov[i].len;
}
}
aes128ccm_encrypt(smb2->serverin_key,
&pdu->crypt[20], 11,
&pdu->crypt[20], 32,
&pdu->crypt[52], spl - 52,
&pdu->crypt[4], 16);
pdu->crypt_len = spl;
return 0;
}
int
smb3_decrypt_pdu(struct smb2_context *smb2)
{
int rc;
if (aes128ccm_decrypt(smb2->serverout_key,
&smb2->in.iov[smb2->in.niov - 2].buf[20], 11,
&smb2->in.iov[smb2->in.niov - 2].buf[20], 32,
&smb2->in.iov[smb2->in.niov - 1].buf[0],
smb2->in.iov[smb2->in.niov - 1].len,
&smb2->in.iov[smb2->in.niov - 2].buf[4], 16)) {
smb2_set_error(smb2, "Failed to decrypt PDU");
return -1;
}
if (smb2->in.num_done == 0) {
smb2->enc = smb2->in.iov[smb2->in.niov - 1].buf;
smb2->enc_len = smb2->in.iov[smb2->in.niov - 1].len;
smb2->enc_pos = 0;
smb2->in.iov[smb2->in.niov - 1].free = NULL;
smb2_free_iovector(smb2, &smb2->in);
smb2->spl = (uint32_t)smb2->enc_len;
smb2->recv_state = SMB2_RECV_HEADER;
if (smb2_add_iovector(smb2, &smb2->in, &smb2->header[0],
SMB2_HEADER_SIZE, NULL) == NULL) {
smb2_set_error(smb2, "Failed to add iovector for decrypted header");
free(smb2->enc);
smb2->enc = NULL;
return -1;
}
}
rc = smb2_read_from_buf(smb2);
free(smb2->enc);
smb2->enc = NULL;
return rc;
}
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