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

     /*
      * Copyright (c) 2000-2001, Boris Popov
      * 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. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *    This product includes software developed by Boris Popov.
     * 4. Neither the name of the author nor the names of any co-contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
     *
     * $FreeBSD: releng/5.0/sys/netsmb/smb_crypt.c 82036 2001-08-21 08:07:18Z bp $
     */
    #include <sys/param.h>
    #include <sys/malloc.h>
    #include <sys/kernel.h>
    #include <sys/systm.h>
    #include <sys/conf.h>
    #include <sys/proc.h>
    #include <sys/fcntl.h>
    #include <sys/socket.h>
    #include <sys/socketvar.h>
    #include <sys/sysctl.h>
    
    #include <sys/md4.h>
    #include <sys/iconv.h>
    
    #include <netsmb/smb.h>
    #include <netsmb/smb_conn.h>
    #include <netsmb/smb_subr.h>
    #include <netsmb/smb_dev.h>
    
    #include "opt_netsmb.h"
    
    #ifdef NETSMBCRYPTO
    
    #include <crypto/des/des.h>
    
    static u_char N8[] = {0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25};
    
    
    static void
    smb_E(const u_char *key, u_char *data, u_char *dest)
    {
            des_key_schedule *ksp;
            u_char kk[8];
    
            kk[0] = key[0] & 0xfe;
            kk[1] = key[0] << 7 | (key[1] >> 1 & 0xfe);
            kk[2] = key[1] << 6 | (key[2] >> 2 & 0xfe);
            kk[3] = key[2] << 5 | (key[3] >> 3 & 0xfe);
            kk[4] = key[3] << 4 | (key[4] >> 4 & 0xfe);
            kk[5] = key[4] << 3 | (key[5] >> 5 & 0xfe);
            kk[6] = key[5] << 2 | (key[6] >> 6 & 0xfe);
            kk[7] = key[6] << 1;
            ksp = malloc(sizeof(des_key_schedule), M_SMBTEMP, M_WAITOK);
            des_set_key((des_cblock *)kk, *ksp);
            des_ecb_encrypt((des_cblock *)data, (des_cblock *)dest, *ksp, 1);
            free(ksp, M_SMBTEMP);
    }
    #endif
    
    
    int
    smb_encrypt(const u_char *apwd, u_char *C8, u_char *RN)
    {
    #ifdef NETSMBCRYPTO
            u_char *p, *P14, *S21;
    
            p = malloc(14 + 21, M_SMBTEMP, M_WAITOK);
            bzero(p, 14 + 21);
            P14 = p;
            S21 = p + 14;
            bcopy(apwd, P14, min(14, strlen(apwd)));
            /*
             * S21 = concat(Ex(P14, N8), zeros(5));
             */
            smb_E(P14, N8, S21);
            smb_E(P14 + 7, N8, S21 + 8);
   
           smb_E(S21, C8, RN);
           smb_E(S21 + 7, C8, RN + 8);
           smb_E(S21 + 14, C8, RN + 16);
           free(p, M_SMBTEMP);
           return 0;
   #else
           SMBERROR("password encryption is not available\n");
           bzero(RN, 24);
           return EAUTH;
   #endif
   }
   
   int
   smb_ntencrypt(const u_char *apwd, u_char *C8, u_char *RN)
   {
   #ifdef NETSMBCRYPTO
           u_char S21[21];
           u_int16_t *unipwd;
           MD4_CTX *ctxp;
           int len;
   
           len = strlen(apwd);
           unipwd = malloc((len + 1) * sizeof(u_int16_t), M_SMBTEMP, M_WAITOK);
           /*
            * S21 = concat(MD4(U(apwd)), zeros(5));
            */
           smb_strtouni(unipwd, apwd);
           ctxp = malloc(sizeof(MD4_CTX), M_SMBTEMP, M_WAITOK);
           MD4Init(ctxp);
           MD4Update(ctxp, (u_char*)unipwd, len * sizeof(u_int16_t));
           free(unipwd, M_SMBTEMP);
           bzero(S21, 21);
           MD4Final(S21, ctxp);
           free(ctxp, M_SMBTEMP);
   
           smb_E(S21, C8, RN);
           smb_E(S21 + 7, C8, RN + 8);
           smb_E(S21 + 14, C8, RN + 16);
           return 0;
   #else
           SMBERROR("password encryption is not available\n");
           bzero(RN, 24);
           return EAUTH;
   #endif
   }
   

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