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Linux/fs/cifs/smbencrypt.c

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Diff markup

Differences between /fs/cifs/smbencrypt.c (Version linux-3.17.8) and /fs/cifs/smbencrypt.c (Version linux-5.3.18)


                                                   >>   1 // SPDX-License-Identifier: GPL-2.0-or-later
  1 /*                                                  2 /*
  2    Unix SMB/Netbios implementation.                 3    Unix SMB/Netbios implementation.
  3    Version 1.9.                                     4    Version 1.9.
  4    SMB parameters and setup                         5    SMB parameters and setup
  5    Copyright (C) Andrew Tridgell 1992-2000          6    Copyright (C) Andrew Tridgell 1992-2000
  6    Copyright (C) Luke Kenneth Casson Leighton       7    Copyright (C) Luke Kenneth Casson Leighton 1996-2000
  7    Modified by Jeremy Allison 1995.                 8    Modified by Jeremy Allison 1995.
  8    Copyright (C) Andrew Bartlett <abartlet@sam      9    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003
  9    Modified by Steve French (sfrench@us.ibm.co     10    Modified by Steve French (sfrench@us.ibm.com) 2002-2003
 10                                                    11 
 11    This program is free software; you can redi << 
 12    it under the terms of the GNU General Publi << 
 13    the Free Software Foundation; either versio << 
 14    (at your option) any later version.         << 
 15                                                << 
 16    This program is distributed in the hope tha << 
 17    but WITHOUT ANY WARRANTY; without even the  << 
 18    MERCHANTABILITY or FITNESS FOR A PARTICULAR << 
 19    GNU General Public License for more details << 
 20                                                << 
 21    You should have received a copy of the GNU  << 
 22    along with this program; if not, write to t << 
 23    Foundation, Inc., 675 Mass Ave, Cambridge,  << 
 24 */                                                 12 */
 25                                                    13 
                                                   >>  14 #include <linux/crypto.h>
 26 #include <linux/module.h>                          15 #include <linux/module.h>
 27 #include <linux/slab.h>                            16 #include <linux/slab.h>
 28 #include <linux/fs.h>                              17 #include <linux/fs.h>
 29 #include <linux/string.h>                          18 #include <linux/string.h>
 30 #include <linux/kernel.h>                          19 #include <linux/kernel.h>
 31 #include <linux/random.h>                          20 #include <linux/random.h>
                                                   >>  21 #include "cifs_fs_sb.h"
 32 #include "cifs_unicode.h"                          22 #include "cifs_unicode.h"
 33 #include "cifspdu.h"                               23 #include "cifspdu.h"
 34 #include "cifsglob.h"                              24 #include "cifsglob.h"
 35 #include "cifs_debug.h"                            25 #include "cifs_debug.h"
 36 #include "cifsproto.h"                             26 #include "cifsproto.h"
 37                                                    27 
 38 #ifndef false                                      28 #ifndef false
 39 #define false 0                                    29 #define false 0
 40 #endif                                             30 #endif
 41 #ifndef true                                       31 #ifndef true
 42 #define true 1                                     32 #define true 1
 43 #endif                                             33 #endif
 44                                                    34 
 45 /* following came from the other byteorder.h t     35 /* following came from the other byteorder.h to avoid include conflicts */
 46 #define CVAL(buf,pos) (((unsigned char *)(buf)     36 #define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
 47 #define SSVALX(buf,pos,val) (CVAL(buf,pos)=(va     37 #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),     38 #define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val)))
 49                                                    39 
 50 static void                                        40 static void
 51 str_to_key(unsigned char *str, unsigned char *     41 str_to_key(unsigned char *str, unsigned char *key)
 52 {                                                  42 {
 53         int i;                                     43         int i;
 54                                                    44 
 55         key[0] = str[0] >> 1;                      45         key[0] = str[0] >> 1;
 56         key[1] = ((str[0] & 0x01) << 6) | (str     46         key[1] = ((str[0] & 0x01) << 6) | (str[1] >> 2);
 57         key[2] = ((str[1] & 0x03) << 5) | (str     47         key[2] = ((str[1] & 0x03) << 5) | (str[2] >> 3);
 58         key[3] = ((str[2] & 0x07) << 4) | (str     48         key[3] = ((str[2] & 0x07) << 4) | (str[3] >> 4);
 59         key[4] = ((str[3] & 0x0F) << 3) | (str     49         key[4] = ((str[3] & 0x0F) << 3) | (str[4] >> 5);
 60         key[5] = ((str[4] & 0x1F) << 2) | (str     50         key[5] = ((str[4] & 0x1F) << 2) | (str[5] >> 6);
 61         key[6] = ((str[5] & 0x3F) << 1) | (str     51         key[6] = ((str[5] & 0x3F) << 1) | (str[6] >> 7);
 62         key[7] = str[6] & 0x7F;                    52         key[7] = str[6] & 0x7F;
 63         for (i = 0; i < 8; i++)                    53         for (i = 0; i < 8; i++)
 64                 key[i] = (key[i] << 1);            54                 key[i] = (key[i] << 1);
 65 }                                                  55 }
 66                                                    56 
 67 static int                                         57 static int
 68 smbhash(unsigned char *out, const unsigned cha     58 smbhash(unsigned char *out, const unsigned char *in, unsigned char *key)
 69 {                                                  59 {
 70         int rc;                                << 
 71         unsigned char key2[8];                     60         unsigned char key2[8];
 72         struct crypto_blkcipher *tfm_des;      !!  61         struct crypto_cipher *tfm_des;
 73         struct scatterlist sgin, sgout;        << 
 74         struct blkcipher_desc desc;            << 
 75                                                    62 
 76         str_to_key(key, key2);                     63         str_to_key(key, key2);
 77                                                    64 
 78         tfm_des = crypto_alloc_blkcipher("ecb( !!  65         tfm_des = crypto_alloc_cipher("des", 0, 0);
 79         if (IS_ERR(tfm_des)) {                     66         if (IS_ERR(tfm_des)) {
 80                 rc = PTR_ERR(tfm_des);         << 
 81                 cifs_dbg(VFS, "could not alloc     67                 cifs_dbg(VFS, "could not allocate des crypto API\n");
 82                 goto smbhash_err;              !!  68                 return PTR_ERR(tfm_des);
 83         }                                          69         }
 84                                                    70 
 85         desc.tfm = tfm_des;                    !!  71         crypto_cipher_setkey(tfm_des, key2, 8);
 86                                                !!  72         crypto_cipher_encrypt_one(tfm_des, out, in);
 87         crypto_blkcipher_setkey(tfm_des, key2, !!  73         crypto_free_cipher(tfm_des);
 88                                                << 
 89         sg_init_one(&sgin, in, 8);             << 
 90         sg_init_one(&sgout, out, 8);           << 
 91                                                    74 
 92         rc = crypto_blkcipher_encrypt(&desc, & !!  75         return 0;
 93         if (rc)                                << 
 94                 cifs_dbg(VFS, "could not encry << 
 95                                                << 
 96         crypto_free_blkcipher(tfm_des);        << 
 97 smbhash_err:                                   << 
 98         return rc;                             << 
 99 }                                                  76 }
100                                                    77 
101 static int                                         78 static int
102 E_P16(unsigned char *p14, unsigned char *p16)      79 E_P16(unsigned char *p14, unsigned char *p16)
103 {                                                  80 {
104         int rc;                                    81         int rc;
105         unsigned char sp8[8] =                     82         unsigned char sp8[8] =
106             { 0x4b, 0x47, 0x53, 0x21, 0x40, 0x     83             { 0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25 };
107                                                    84 
108         rc = smbhash(p16, sp8, p14);               85         rc = smbhash(p16, sp8, p14);
109         if (rc)                                    86         if (rc)
110                 return rc;                         87                 return rc;
111         rc = smbhash(p16 + 8, sp8, p14 + 7);       88         rc = smbhash(p16 + 8, sp8, p14 + 7);
112         return rc;                                 89         return rc;
113 }                                                  90 }
114                                                    91 
115 static int                                         92 static int
116 E_P24(unsigned char *p21, const unsigned char      93 E_P24(unsigned char *p21, const unsigned char *c8, unsigned char *p24)
117 {                                                  94 {
118         int rc;                                    95         int rc;
119                                                    96 
120         rc = smbhash(p24, c8, p21);                97         rc = smbhash(p24, c8, p21);
121         if (rc)                                    98         if (rc)
122                 return rc;                         99                 return rc;
123         rc = smbhash(p24 + 8, c8, p21 + 7);       100         rc = smbhash(p24 + 8, c8, p21 + 7);
124         if (rc)                                   101         if (rc)
125                 return rc;                        102                 return rc;
126         rc = smbhash(p24 + 16, c8, p21 + 14);     103         rc = smbhash(p24 + 16, c8, p21 + 14);
127         return rc;                                104         return rc;
128 }                                                 105 }
129                                                   106 
130 /* produce a md4 message digest from data of l    107 /* produce a md4 message digest from data of length n bytes */
131 int                                               108 int
132 mdfour(unsigned char *md4_hash, unsigned char     109 mdfour(unsigned char *md4_hash, unsigned char *link_str, int link_len)
133 {                                                 110 {
134         int rc;                                   111         int rc;
135         unsigned int size;                     !! 112         struct crypto_shash *md4 = NULL;
136         struct crypto_shash *md4;              !! 113         struct sdesc *sdescmd4 = NULL;
137         struct sdesc *sdescmd4;                !! 114 
138                                                !! 115         rc = cifs_alloc_hash("md4", &md4, &sdescmd4);
139         md4 = crypto_alloc_shash("md4", 0, 0); !! 116         if (rc)
140         if (IS_ERR(md4)) {                     << 
141                 rc = PTR_ERR(md4);             << 
142                 cifs_dbg(VFS, "%s: Crypto md4  << 
143                          __func__, rc);        << 
144                 return rc;                     << 
145         }                                      << 
146         size = sizeof(struct shash_desc) + cry << 
147         sdescmd4 = kmalloc(size, GFP_KERNEL);  << 
148         if (!sdescmd4) {                       << 
149                 rc = -ENOMEM;                  << 
150                 goto mdfour_err;                  117                 goto mdfour_err;
151         }                                      << 
152         sdescmd4->shash.tfm = md4;             << 
153         sdescmd4->shash.flags = 0x0;           << 
154                                                   118 
155         rc = crypto_shash_init(&sdescmd4->shas    119         rc = crypto_shash_init(&sdescmd4->shash);
156         if (rc) {                                 120         if (rc) {
157                 cifs_dbg(VFS, "%s: Could not i    121                 cifs_dbg(VFS, "%s: Could not init md4 shash\n", __func__);
158                 goto mdfour_err;                  122                 goto mdfour_err;
159         }                                         123         }
160         rc = crypto_shash_update(&sdescmd4->sh    124         rc = crypto_shash_update(&sdescmd4->shash, link_str, link_len);
161         if (rc) {                                 125         if (rc) {
162                 cifs_dbg(VFS, "%s: Could not u    126                 cifs_dbg(VFS, "%s: Could not update with link_str\n", __func__);
163                 goto mdfour_err;                  127                 goto mdfour_err;
164         }                                         128         }
165         rc = crypto_shash_final(&sdescmd4->sha    129         rc = crypto_shash_final(&sdescmd4->shash, md4_hash);
166         if (rc)                                   130         if (rc)
167                 cifs_dbg(VFS, "%s: Could not g    131                 cifs_dbg(VFS, "%s: Could not generate md4 hash\n", __func__);
168                                                   132 
169 mdfour_err:                                       133 mdfour_err:
170         crypto_free_shash(md4);                !! 134         cifs_free_hash(&md4, &sdescmd4);
171         kfree(sdescmd4);                       << 
172                                                << 
173         return rc;                                135         return rc;
174 }                                                 136 }
175                                                   137 
176 /*                                                138 /*
177    This implements the X/Open SMB password enc    139    This implements the X/Open SMB password encryption
178    It takes a password, a 8 byte "crypt key" a    140    It takes a password, a 8 byte "crypt key" and puts 24 bytes of
179    encrypted password into p24 */                 141    encrypted password into p24 */
180 /* Note that password must be uppercased and n    142 /* Note that password must be uppercased and null terminated */
181 int                                               143 int
182 SMBencrypt(unsigned char *passwd, const unsign    144 SMBencrypt(unsigned char *passwd, const unsigned char *c8, unsigned char *p24)
183 {                                                 145 {
184         int rc;                                   146         int rc;
185         unsigned char p14[14], p16[16], p21[21    147         unsigned char p14[14], p16[16], p21[21];
186                                                   148 
187         memset(p14, '\0', 14);                    149         memset(p14, '\0', 14);
188         memset(p16, '\0', 16);                    150         memset(p16, '\0', 16);
189         memset(p21, '\0', 21);                    151         memset(p21, '\0', 21);
190                                                   152 
191         memcpy(p14, passwd, 14);                  153         memcpy(p14, passwd, 14);
192         rc = E_P16(p14, p16);                     154         rc = E_P16(p14, p16);
193         if (rc)                                   155         if (rc)
194                 return rc;                        156                 return rc;
195                                                   157 
196         memcpy(p21, p16, 16);                     158         memcpy(p21, p16, 16);
197         rc = E_P24(p21, c8, p24);                 159         rc = E_P24(p21, c8, p24);
198                                                   160 
199         return rc;                                161         return rc;
200 }                                                 162 }
201                                                   163 
202 /*                                                164 /*
203  * Creates the MD4 Hash of the users password     165  * Creates the MD4 Hash of the users password in NT UNICODE.
204  */                                               166  */
205                                                   167 
206 int                                               168 int
207 E_md4hash(const unsigned char *passwd, unsigne    169 E_md4hash(const unsigned char *passwd, unsigned char *p16,
208         const struct nls_table *codepage)         170         const struct nls_table *codepage)
209 {                                                 171 {
210         int rc;                                   172         int rc;
211         int len;                                  173         int len;
212         __le16 wpwd[129];                         174         __le16 wpwd[129];
213                                                   175 
214         /* Password cannot be longer than 128     176         /* Password cannot be longer than 128 characters */
215         if (passwd) /* Password must be conver    177         if (passwd) /* Password must be converted to NT unicode */
216                 len = cifs_strtoUTF16(wpwd, pa    178                 len = cifs_strtoUTF16(wpwd, passwd, 128, codepage);
217         else {                                    179         else {
218                 len = 0;                          180                 len = 0;
219                 *wpwd = 0; /* Ensure string is    181                 *wpwd = 0; /* Ensure string is null terminated */
220         }                                         182         }
221                                                   183 
222         rc = mdfour(p16, (unsigned char *) wpw    184         rc = mdfour(p16, (unsigned char *) wpwd, len * sizeof(__le16));
223         memset(wpwd, 0, 129 * sizeof(__le16)); !! 185         memzero_explicit(wpwd, sizeof(wpwd));
224                                                   186 
225         return rc;                                187         return rc;
226 }                                                 188 }
227                                                   189 
228 /* Does the NT MD4 hash then des encryption. *    190 /* Does the NT MD4 hash then des encryption. */
229 int                                               191 int
230 SMBNTencrypt(unsigned char *passwd, unsigned c    192 SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24,
231                 const struct nls_table *codepa    193                 const struct nls_table *codepage)
232 {                                                 194 {
233         int rc;                                   195         int rc;
234         unsigned char p16[16], p21[21];           196         unsigned char p16[16], p21[21];
235                                                   197 
236         memset(p16, '\0', 16);                    198         memset(p16, '\0', 16);
237         memset(p21, '\0', 21);                    199         memset(p21, '\0', 21);
238                                                   200 
239         rc = E_md4hash(passwd, p16, codepage);    201         rc = E_md4hash(passwd, p16, codepage);
240         if (rc) {                                 202         if (rc) {
241                 cifs_dbg(FYI, "%s Can't genera    203                 cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n",
242                          __func__, rc);           204                          __func__, rc);
243                 return rc;                        205                 return rc;
244         }                                         206         }
245         memcpy(p21, p16, 16);                     207         memcpy(p21, p16, 16);
246         rc = E_P24(p21, c8, p24);                 208         rc = E_P24(p21, c8, p24);
247         return rc;                                209         return rc;
248 }                                                 210 }
249                                                   211 

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