~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/fs/cifs/smbencrypt.c

Version: ~ [ linux-5.10-rc5 ] ~ [ linux-5.9.10 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.79 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.159 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.208 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.245 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.245 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp