smb_crypt.c revision 75374 
1/*
2 * Copyright (c) 2000-2001, Boris Popov
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *    This product includes software developed by Boris Popov.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * $FreeBSD: head/sys/netsmb/smb_crypt.c 75374 2001-04-10 07:59:06Z bp $
33 */
34#include <sys/param.h>
35#include <sys/malloc.h>
36#include <sys/kernel.h>
37#include <sys/systm.h>
38#include <sys/conf.h>
39#include <sys/proc.h>
40#include <sys/fcntl.h>
41#include <sys/socket.h>
42#include <sys/socketvar.h>
43#include <sys/sysctl.h>
44
45#include <sys/md4.h>
46#include <sys/iconv.h>
47
48#include <netsmb/smb.h>
49#include <netsmb/smb_conn.h>
50#include <netsmb/smb_subr.h>
51#include <netsmb/smb_dev.h>
52
53#include "opt_netsmb.h"
54
55#ifdef NETSMBCRYPTO
56
57#include <crypto/des/des.h>
58
59static u_char N8[] = {0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25};
60
61
62static void
63smb_E(const u_char *key, u_char *data, u_char *dest)
64{
65	des_key_schedule *ksp;
66	u_char kk[8];
67
68	kk[0] = key[0] & 0xfe;
69	kk[1] = key[0] << 7 | (key[1] >> 1 & 0xfe);
70	kk[2] = key[1] << 6 | (key[2] >> 2 & 0xfe);
71	kk[3] = key[2] << 5 | (key[3] >> 3 & 0xfe);
72	kk[4] = key[3] << 4 | (key[4] >> 4 & 0xfe);
73	kk[5] = key[4] << 3 | (key[5] >> 5 & 0xfe);
74	kk[6] = key[5] << 2 | (key[6] >> 6 & 0xfe);
75	kk[7] = key[6] << 1;
76	ksp = malloc(sizeof(des_key_schedule), M_SMBTEMP, M_WAITOK);
77	des_set_key((C_Block*)kk, *ksp);
78	des_ecb_encrypt((C_Block*)data, (C_Block*)dest, *ksp, 1);
79	free(ksp, M_SMBTEMP);
80}
81#endif
82
83
84int
85smb_encrypt(const u_char *apwd, u_char *C8, u_char *RN)
86{
87#ifdef NETSMBCRYPTO
88	u_char *p, *P14, *S21;
89
90	p = malloc(14 + 21, M_SMBTEMP, M_WAITOK);
91	bzero(p, 14 + 21);
92	P14 = p;
93	S21 = p + 14;
94	bcopy(apwd, P14, min(14, strlen(apwd)));
95	/*
96	 * S21 = concat(Ex(P14, N8), zeros(5));
97	 */
98	smb_E(P14, N8, S21);
99	smb_E(P14 + 7, N8, S21 + 8);
100
101	smb_E(S21, C8, RN);
102	smb_E(S21 + 7, C8, RN + 8);
103	smb_E(S21 + 14, C8, RN + 16);
104	free(p, M_SMBTEMP);
105	return 0;
106#else
107	SMBERROR("password encryption is not available\n");
108	bzero(RN, 24);
109	return EAUTH;
110#endif
111}
112
113int
114smb_ntencrypt(const u_char *apwd, u_char *C8, u_char *RN)
115{
116#ifdef NETSMBCRYPTO
117	u_char S21[21];
118	u_int16_t *unipwd;
119	MD4_CTX *ctxp;
120	int len;
121
122	len = strlen(apwd);
123	unipwd = malloc(len * sizeof(u_int16_t), M_SMBTEMP, M_WAITOK);
124	/*
125	 * S21 = concat(MD4(U(apwd)), zeros(5));
126	 */
127	smb_strtouni(unipwd, apwd);
128	ctxp = malloc(sizeof(MD4_CTX), M_SMBTEMP, M_WAITOK);
129	MD4Init(ctxp);
130	MD4Update(ctxp, (u_char*)unipwd, len * sizeof(u_int16_t));
131	free(unipwd, M_SMBTEMP);
132	bzero(S21, 21);
133	MD4Final(S21, ctxp);
134	free(ctxp, M_SMBTEMP);
135
136	smb_E(S21, C8, RN);
137	smb_E(S21 + 7, C8, RN + 8);
138	smb_E(S21 + 14, C8, RN + 16);
139	return 0;
140#else
141	SMBERROR("password encryption is not available\n");
142	bzero(RN, 24);
143	return EAUTH;
144#endif
145}
146
147