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Linux/fs/cifs/smbencrypt.c

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  1 /*
  2    Unix SMB/Netbios implementation.
  3    Version 1.9.
  4    SMB parameters and setup
  5    Copyright (C) Andrew Tridgell 1992-2000
  6    Copyright (C) Luke Kenneth Casson Leighton 1996-2000
  7    Modified by Jeremy Allison 1995.
  8    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003
  9    Modified by Steve French (sfrench@us.ibm.com) 2002-2003
 10 
 11    This program is free software; you can redistribute it and/or modify
 12    it under the terms of the GNU General Public License as published by
 13    the Free Software Foundation; either version 2 of the License, or
 14    (at your option) any later version.
 15 
 16    This program is distributed in the hope that it will be useful,
 17    but WITHOUT ANY WARRANTY; without even the implied warranty of
 18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 19    GNU General Public License for more details.
 20 
 21    You should have received a copy of the GNU General Public License
 22    along with this program; if not, write to the Free Software
 23    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 24 */
 25 
 26 #include <linux/crypto.h>
 27 #include <linux/module.h>
 28 #include <linux/slab.h>
 29 #include <linux/fs.h>
 30 #include <linux/string.h>
 31 #include <linux/kernel.h>
 32 #include <linux/random.h>
 33 #include "cifs_fs_sb.h"
 34 #include "cifs_unicode.h"
 35 #include "cifspdu.h"
 36 #include "cifsglob.h"
 37 #include "cifs_debug.h"
 38 #include "cifsproto.h"
 39 
 40 #ifndef false
 41 #define false 0
 42 #endif
 43 #ifndef true
 44 #define true 1
 45 #endif
 46 
 47 /* following came from the other byteorder.h to avoid include conflicts */
 48 #define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
 49 #define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
 50 #define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val)))
 51 
 52 static void
 53 str_to_key(unsigned char *str, unsigned char *key)
 54 {
 55         int i;
 56 
 57         key[0] = str[0] >> 1;
 58         key[1] = ((str[0] & 0x01) << 6) | (str[1] >> 2);
 59         key[2] = ((str[1] & 0x03) << 5) | (str[2] >> 3);
 60         key[3] = ((str[2] & 0x07) << 4) | (str[3] >> 4);
 61         key[4] = ((str[3] & 0x0F) << 3) | (str[4] >> 5);
 62         key[5] = ((str[4] & 0x1F) << 2) | (str[5] >> 6);
 63         key[6] = ((str[5] & 0x3F) << 1) | (str[6] >> 7);
 64         key[7] = str[6] & 0x7F;
 65         for (i = 0; i < 8; i++)
 66                 key[i] = (key[i] << 1);
 67 }
 68 
 69 static int
 70 smbhash(unsigned char *out, const unsigned char *in, unsigned char *key)
 71 {
 72         unsigned char key2[8];
 73         struct crypto_cipher *tfm_des;
 74 
 75         str_to_key(key, key2);
 76 
 77         tfm_des = crypto_alloc_cipher("des", 0, 0);
 78         if (IS_ERR(tfm_des)) {
 79                 cifs_dbg(VFS, "could not allocate des crypto API\n");
 80                 return PTR_ERR(tfm_des);
 81         }
 82 
 83         crypto_cipher_setkey(tfm_des, key2, 8);
 84         crypto_cipher_encrypt_one(tfm_des, out, in);
 85         crypto_free_cipher(tfm_des);
 86 
 87         return 0;
 88 }
 89 
 90 static int
 91 E_P16(unsigned char *p14, unsigned char *p16)
 92 {
 93         int rc;
 94         unsigned char sp8[8] =
 95             { 0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25 };
 96 
 97         rc = smbhash(p16, sp8, p14);
 98         if (rc)
 99                 return rc;
100         rc = smbhash(p16 + 8, sp8, p14 + 7);
101         return rc;
102 }
103 
104 static int
105 E_P24(unsigned char *p21, const unsigned char *c8, unsigned char *p24)
106 {
107         int rc;
108 
109         rc = smbhash(p24, c8, p21);
110         if (rc)
111                 return rc;
112         rc = smbhash(p24 + 8, c8, p21 + 7);
113         if (rc)
114                 return rc;
115         rc = smbhash(p24 + 16, c8, p21 + 14);
116         return rc;
117 }
118 
119 /* produce a md4 message digest from data of length n bytes */
120 int
121 mdfour(unsigned char *md4_hash, unsigned char *link_str, int link_len)
122 {
123         int rc;
124         struct crypto_shash *md4 = NULL;
125         struct sdesc *sdescmd4 = NULL;
126 
127         rc = cifs_alloc_hash("md4", &md4, &sdescmd4);
128         if (rc)
129                 goto mdfour_err;
130 
131         rc = crypto_shash_init(&sdescmd4->shash);
132         if (rc) {
133                 cifs_dbg(VFS, "%s: Could not init md4 shash\n", __func__);
134                 goto mdfour_err;
135         }
136         rc = crypto_shash_update(&sdescmd4->shash, link_str, link_len);
137         if (rc) {
138                 cifs_dbg(VFS, "%s: Could not update with link_str\n", __func__);
139                 goto mdfour_err;
140         }
141         rc = crypto_shash_final(&sdescmd4->shash, md4_hash);
142         if (rc)
143                 cifs_dbg(VFS, "%s: Could not generate md4 hash\n", __func__);
144 
145 mdfour_err:
146         cifs_free_hash(&md4, &sdescmd4);
147         return rc;
148 }
149 
150 /*
151    This implements the X/Open SMB password encryption
152    It takes a password, a 8 byte "crypt key" and puts 24 bytes of
153    encrypted password into p24 */
154 /* Note that password must be uppercased and null terminated */
155 int
156 SMBencrypt(unsigned char *passwd, const unsigned char *c8, unsigned char *p24)
157 {
158         int rc;
159         unsigned char p14[14], p16[16], p21[21];
160 
161         memset(p14, '\0', 14);
162         memset(p16, '\0', 16);
163         memset(p21, '\0', 21);
164 
165         memcpy(p14, passwd, 14);
166         rc = E_P16(p14, p16);
167         if (rc)
168                 return rc;
169 
170         memcpy(p21, p16, 16);
171         rc = E_P24(p21, c8, p24);
172 
173         return rc;
174 }
175 
176 /*
177  * Creates the MD4 Hash of the users password in NT UNICODE.
178  */
179 
180 int
181 E_md4hash(const unsigned char *passwd, unsigned char *p16,
182         const struct nls_table *codepage)
183 {
184         int rc;
185         int len;
186         __le16 wpwd[129];
187 
188         /* Password cannot be longer than 128 characters */
189         if (passwd) /* Password must be converted to NT unicode */
190                 len = cifs_strtoUTF16(wpwd, passwd, 128, codepage);
191         else {
192                 len = 0;
193                 *wpwd = 0; /* Ensure string is null terminated */
194         }
195 
196         rc = mdfour(p16, (unsigned char *) wpwd, len * sizeof(__le16));
197         memzero_explicit(wpwd, sizeof(wpwd));
198 
199         return rc;
200 }
201 
202 /* Does the NT MD4 hash then des encryption. */
203 int
204 SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24,
205                 const struct nls_table *codepage)
206 {
207         int rc;
208         unsigned char p16[16], p21[21];
209 
210         memset(p16, '\0', 16);
211         memset(p21, '\0', 21);
212 
213         rc = E_md4hash(passwd, p16, codepage);
214         if (rc) {
215                 cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n",
216                          __func__, rc);
217                 return rc;
218         }
219         memcpy(p21, p16, 16);
220         rc = E_P24(p21, c8, p24);
221         return rc;
222 }
223 

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