The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netsmb/smb_crypt.c

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    1 /*      $NetBSD: smb_crypt.c,v 1.11 2009/03/18 16:00:24 cegger Exp $    */
    2 
    3 /*
    4  * Copyright (c) 2000-2001, Boris Popov
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. All advertising materials mentioning features or use of this software
   16  *    must display the following acknowledgement:
   17  *    This product includes software developed by Boris Popov.
   18  * 4. Neither the name of the author nor the names of any co-contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  * FreeBSD: src/sys/netsmb/smb_crypt.c,v 1.3 2001/08/21 08:07:18 bp Exp
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __KERNEL_RCSID(0, "$NetBSD: smb_crypt.c,v 1.11 2009/03/18 16:00:24 cegger Exp $");
   39 
   40 #include <sys/param.h>
   41 #include <sys/malloc.h>
   42 #include <sys/kernel.h>
   43 #include <sys/systm.h>
   44 #include <sys/conf.h>
   45 #include <sys/proc.h>
   46 #include <sys/fcntl.h>
   47 #include <sys/socket.h>
   48 #include <sys/socketvar.h>
   49 #include <sys/sysctl.h>
   50 
   51 #include <sys/md4.h>
   52 
   53 #include <netsmb/smb.h>
   54 #include <netsmb/smb_conn.h>
   55 #include <netsmb/smb_subr.h>
   56 #include <netsmb/smb_dev.h>
   57 
   58 /* always enable */
   59 #define NETSMBCRYPTO
   60 
   61 #ifdef NETSMBCRYPTO
   62 
   63 #include <crypto/des/des.h>
   64 
   65 static const u_char N8[] = {0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25};
   66 
   67 
   68 static void
   69 smb_E(const u_char *key, const u_char *data, u_char *dest)
   70 {
   71         des_key_schedule *ksp;
   72         u_char kk[8];
   73 
   74         kk[0] = key[0] & 0xfe;
   75         kk[1] = key[0] << 7 | (key[1] >> 1 & 0xfe);
   76         kk[2] = key[1] << 6 | (key[2] >> 2 & 0xfe);
   77         kk[3] = key[2] << 5 | (key[3] >> 3 & 0xfe);
   78         kk[4] = key[3] << 4 | (key[4] >> 4 & 0xfe);
   79         kk[5] = key[4] << 3 | (key[5] >> 5 & 0xfe);
   80         kk[6] = key[5] << 2 | (key[6] >> 6 & 0xfe);
   81         kk[7] = key[6] << 1;
   82         ksp = malloc(sizeof(des_key_schedule), M_SMBTEMP, M_WAITOK);
   83         des_set_key((des_cblock *)kk, *ksp);
   84         /* XXXUNCONST */
   85         des_ecb_encrypt(__UNCONST(data), (des_cblock *)dest, *ksp, 1);
   86         free(ksp, M_SMBTEMP);
   87 }
   88 #endif
   89 
   90 
   91 int
   92 smb_encrypt(const u_char *apwd, u_char *C8, u_char *RN)
   93 {
   94 #ifdef NETSMBCRYPTO
   95         u_char *p, *P14, *S21;
   96 
   97         p = malloc(14 + 21, M_SMBTEMP, M_WAITOK|M_ZERO);
   98         P14 = p;
   99         S21 = p + 14;
  100         bcopy(apwd, P14, min(14, strlen(apwd)));
  101         /*
  102          * S21 = concat(Ex(P14, N8), zeros(5));
  103          */
  104         smb_E(P14, N8, S21);
  105         smb_E(P14 + 7, N8, S21 + 8);
  106 
  107         smb_E(S21, C8, RN);
  108         smb_E(S21 + 7, C8, RN + 8);
  109         smb_E(S21 + 14, C8, RN + 16);
  110         free(p, M_SMBTEMP);
  111         return 0;
  112 #else
  113         SMBERROR(("password encryption is not available\n"));
  114         memset(RN, 0, 24);
  115         return EAUTH;
  116 #endif
  117 }
  118 
  119 int
  120 smb_ntencrypt(const u_char *apwd, u_char *C8, u_char *RN)
  121 {
  122 #ifdef NETSMBCRYPTO
  123         u_char S21[21];
  124         u_int16_t *unipwd;
  125         MD4_CTX *ctxp;
  126         int len;
  127 
  128         len = strlen(apwd);
  129         unipwd = malloc((len + 1) * sizeof(u_int16_t), M_SMBTEMP, M_WAITOK);
  130         /*
  131          * S21 = concat(MD4(U(apwd)), zeros(5));
  132          */
  133         smb_strtouni(unipwd, apwd);
  134         ctxp = malloc(sizeof(MD4_CTX), M_SMBTEMP, M_WAITOK);
  135         MD4Init(ctxp);
  136         MD4Update(ctxp, (u_char*)unipwd, len * sizeof(u_int16_t));
  137         free(unipwd, M_SMBTEMP);
  138         memset(S21, 0, 21);
  139         MD4Final(S21, ctxp);
  140         free(ctxp, M_SMBTEMP);
  141 
  142         smb_E(S21, C8, RN);
  143         smb_E(S21 + 7, C8, RN + 8);
  144         smb_E(S21 + 14, C8, RN + 16);
  145         return 0;
  146 #else
  147         SMBERROR(("password encryption is not available\n"));
  148         memset(RN, 0, 24);
  149         return EAUTH;
  150 #endif
  151 }
  152 

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