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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/module.h>
 27 #include <linux/slab.h>
 28 #include <linux/fs.h>
 29 #include <linux/string.h>
 30 #include <linux/kernel.h>
 31 #include <linux/random.h>
 32 #include "cifs_fs_sb.h"
 33 #include "cifs_unicode.h"
 34 #include "cifspdu.h"
 35 #include "cifsglob.h"
 36 #include "cifs_debug.h"
 37 #include "cifsproto.h"
 38 
 39 #ifndef false
 40 #define false 0
 41 #endif
 42 #ifndef true
 43 #define true 1
 44 #endif
 45 
 46 /* following came from the other byteorder.h to avoid include conflicts */
 47 #define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
 48 #define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
 49 #define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val)))
 50 
 51 static void
 52 str_to_key(unsigned char *str, unsigned char *key)
 53 {
 54         int i;
 55 
 56         key[0] = str[0] >> 1;
 57         key[1] = ((str[0] & 0x01) << 6) | (str[1] >> 2);
 58         key[2] = ((str[1] & 0x03) << 5) | (str[2] >> 3);
 59         key[3] = ((str[2] & 0x07) << 4) | (str[3] >> 4);
 60         key[4] = ((str[3] & 0x0F) << 3) | (str[4] >> 5);
 61         key[5] = ((str[4] & 0x1F) << 2) | (str[5] >> 6);
 62         key[6] = ((str[5] & 0x3F) << 1) | (str[6] >> 7);
 63         key[7] = str[6] & 0x7F;
 64         for (i = 0; i < 8; i++)
 65                 key[i] = (key[i] << 1);
 66 }
 67 
 68 static int
 69 smbhash(unsigned char *out, const unsigned char *in, unsigned char *key)
 70 {
 71         int rc;
 72         unsigned char key2[8];
 73         struct crypto_blkcipher *tfm_des;
 74         struct scatterlist sgin, sgout;
 75         struct blkcipher_desc desc;
 76 
 77         str_to_key(key, key2);
 78 
 79         tfm_des = crypto_alloc_blkcipher("ecb(des)", 0, CRYPTO_ALG_ASYNC);
 80         if (IS_ERR(tfm_des)) {
 81                 rc = PTR_ERR(tfm_des);
 82                 cifs_dbg(VFS, "could not allocate des crypto API\n");
 83                 goto smbhash_err;
 84         }
 85 
 86         desc.tfm = tfm_des;
 87 
 88         crypto_blkcipher_setkey(tfm_des, key2, 8);
 89 
 90         sg_init_one(&sgin, in, 8);
 91         sg_init_one(&sgout, out, 8);
 92 
 93         rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, 8);
 94         if (rc)
 95                 cifs_dbg(VFS, "could not encrypt crypt key rc: %d\n", rc);
 96 
 97         crypto_free_blkcipher(tfm_des);
 98 smbhash_err:
 99         return rc;
100 }
101 
102 static int
103 E_P16(unsigned char *p14, unsigned char *p16)
104 {
105         int rc;
106         unsigned char sp8[8] =
107             { 0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25 };
108 
109         rc = smbhash(p16, sp8, p14);
110         if (rc)
111                 return rc;
112         rc = smbhash(p16 + 8, sp8, p14 + 7);
113         return rc;
114 }
115 
116 static int
117 E_P24(unsigned char *p21, const unsigned char *c8, unsigned char *p24)
118 {
119         int rc;
120 
121         rc = smbhash(p24, c8, p21);
122         if (rc)
123                 return rc;
124         rc = smbhash(p24 + 8, c8, p21 + 7);
125         if (rc)
126                 return rc;
127         rc = smbhash(p24 + 16, c8, p21 + 14);
128         return rc;
129 }
130 
131 /* produce a md4 message digest from data of length n bytes */
132 int
133 mdfour(unsigned char *md4_hash, unsigned char *link_str, int link_len)
134 {
135         int rc;
136         unsigned int size;
137         struct crypto_shash *md4;
138         struct sdesc *sdescmd4;
139 
140         md4 = crypto_alloc_shash("md4", 0, 0);
141         if (IS_ERR(md4)) {
142                 rc = PTR_ERR(md4);
143                 cifs_dbg(VFS, "%s: Crypto md4 allocation error %d\n",
144                          __func__, rc);
145                 return rc;
146         }
147         size = sizeof(struct shash_desc) + crypto_shash_descsize(md4);
148         sdescmd4 = kmalloc(size, GFP_KERNEL);
149         if (!sdescmd4) {
150                 rc = -ENOMEM;
151                 goto mdfour_err;
152         }
153         sdescmd4->shash.tfm = md4;
154         sdescmd4->shash.flags = 0x0;
155 
156         rc = crypto_shash_init(&sdescmd4->shash);
157         if (rc) {
158                 cifs_dbg(VFS, "%s: Could not init md4 shash\n", __func__);
159                 goto mdfour_err;
160         }
161         rc = crypto_shash_update(&sdescmd4->shash, link_str, link_len);
162         if (rc) {
163                 cifs_dbg(VFS, "%s: Could not update with link_str\n", __func__);
164                 goto mdfour_err;
165         }
166         rc = crypto_shash_final(&sdescmd4->shash, md4_hash);
167         if (rc)
168                 cifs_dbg(VFS, "%s: Could not generate md4 hash\n", __func__);
169 
170 mdfour_err:
171         crypto_free_shash(md4);
172         kfree(sdescmd4);
173 
174         return rc;
175 }
176 
177 /*
178    This implements the X/Open SMB password encryption
179    It takes a password, a 8 byte "crypt key" and puts 24 bytes of
180    encrypted password into p24 */
181 /* Note that password must be uppercased and null terminated */
182 int
183 SMBencrypt(unsigned char *passwd, const unsigned char *c8, unsigned char *p24)
184 {
185         int rc;
186         unsigned char p14[14], p16[16], p21[21];
187 
188         memset(p14, '\0', 14);
189         memset(p16, '\0', 16);
190         memset(p21, '\0', 21);
191 
192         memcpy(p14, passwd, 14);
193         rc = E_P16(p14, p16);
194         if (rc)
195                 return rc;
196 
197         memcpy(p21, p16, 16);
198         rc = E_P24(p21, c8, p24);
199 
200         return rc;
201 }
202 
203 /*
204  * Creates the MD4 Hash of the users password in NT UNICODE.
205  */
206 
207 int
208 E_md4hash(const unsigned char *passwd, unsigned char *p16,
209         const struct nls_table *codepage)
210 {
211         int rc;
212         int len;
213         __le16 wpwd[129];
214 
215         /* Password cannot be longer than 128 characters */
216         if (passwd) /* Password must be converted to NT unicode */
217                 len = cifs_strtoUTF16(wpwd, passwd, 128, codepage);
218         else {
219                 len = 0;
220                 *wpwd = 0; /* Ensure string is null terminated */
221         }
222 
223         rc = mdfour(p16, (unsigned char *) wpwd, len * sizeof(__le16));
224         memzero_explicit(wpwd, sizeof(wpwd));
225 
226         return rc;
227 }
228 
229 /* Does the NT MD4 hash then des encryption. */
230 int
231 SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24,
232                 const struct nls_table *codepage)
233 {
234         int rc;
235         unsigned char p16[16], p21[21];
236 
237         memset(p16, '\0', 16);
238         memset(p21, '\0', 21);
239 
240         rc = E_md4hash(passwd, p16, codepage);
241         if (rc) {
242                 cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n",
243                          __func__, rc);
244                 return rc;
245         }
246         memcpy(p21, p16, 16);
247         rc = E_P24(p21, c8, p24);
248         return rc;
249 }
250 

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