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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_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
50static void
51str_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
67static int
68smbhash(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 cERROR(1, "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 cERROR(1, "could not encrypt crypt key rc: %d\n", rc);
95
96 crypto_free_blkcipher(tfm_des);
97smbhash_err:
98 return rc;
99}
100
101static int
102E_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
115static int
116E_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 */
131int
132mdfour(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 cERROR(1, "%s: Crypto md4 allocation error %d\n", __func__, rc);
143 return rc;
144 }
145 size = sizeof(struct shash_desc) + crypto_shash_descsize(md4);
146 sdescmd4 = kmalloc(size, GFP_KERNEL);
147 if (!sdescmd4) {
148 rc = -ENOMEM;
149 cERROR(1, "%s: Memory allocation failure\n", __func__);
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 cERROR(1, "%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 cERROR(1, "%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 cERROR(1, "%s: Could not genereate md4 hash\n", __func__);
168
169mdfour_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 */
181int
182SMBencrypt(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/* Routines for Windows NT MD4 Hash functions. */
203static int
204_my_wcslen(__u16 *str)
205{
206 int len = 0;
207 while (*str++ != 0)
208 len++;
209 return len;
210}
211
212/*
213 * Convert a string into an NT UNICODE string.
214 * Note that regardless of processor type
215 * this must be in intel (little-endian)
216 * format.
217 */
218
219static int
220_my_mbstowcs(__u16 *dst, const unsigned char *src, int len)
221{ /* BB not a very good conversion routine - change/fix */
222 int i;
223 __u16 val;
224
225 for (i = 0; i < len; i++) {
226 val = *src;
227 SSVAL(dst, 0, val);
228 dst++;
229 src++;
230 if (val == 0)
231 break;
232 }
233 return i;
234}
235
236/*
237 * Creates the MD4 Hash of the users password in NT UNICODE.
238 */
239
240int
241E_md4hash(const unsigned char *passwd, unsigned char *p16)
242{
243 int rc;
244 int len;
245 __u16 wpwd[129];
246
247 /* Password cannot be longer than 128 characters */
248 if (passwd) {
249 len = strlen((char *) passwd);
250 if (len > 128)
251 len = 128;
252
253 /* Password must be converted to NT unicode */
254 _my_mbstowcs(wpwd, passwd, len);
255 } else
256 len = 0;
257
258 wpwd[len] = 0; /* Ensure string is null terminated */
259 /* Calculate length in bytes */
260 len = _my_wcslen(wpwd) * sizeof(__u16);
261
262 rc = mdfour(p16, (unsigned char *) wpwd, len);
263 memset(wpwd, 0, 129 * 2);
264
265 return rc;
266}
267
268#if 0 /* currently unused */
269/* Does both the NT and LM owfs of a user's password */
270static void
271nt_lm_owf_gen(char *pwd, unsigned char nt_p16[16], unsigned char p16[16])
272{
273 char passwd[514];
274
275 memset(passwd, '\0', 514);
276 if (strlen(pwd) < 513)
277 strcpy(passwd, pwd);
278 else
279 memcpy(passwd, pwd, 512);
280 /* Calculate the MD4 hash (NT compatible) of the password */
281 memset(nt_p16, '\0', 16);
282 E_md4hash(passwd, nt_p16);
283
284 /* Mangle the passwords into Lanman format */
285 passwd[14] = '\0';
286/* strupper(passwd); */
287
288 /* Calculate the SMB (lanman) hash functions of the password */
289
290 memset(p16, '\0', 16);
291 E_P16((unsigned char *) passwd, (unsigned char *) p16);
292
293 /* clear out local copy of user's password (just being paranoid). */
294 memset(passwd, '\0', sizeof(passwd));
295}
296#endif
297
298/* Does the NTLMv2 owfs of a user's password */
299#if 0 /* function not needed yet - but will be soon */
300static void
301ntv2_owf_gen(const unsigned char owf[16], const char *user_n,
302 const char *domain_n, unsigned char kr_buf[16],
303 const struct nls_table *nls_codepage)
304{
305 wchar_t *user_u;
306 wchar_t *dom_u;
307 int user_l, domain_l;
308 struct HMACMD5Context ctx;
309
310 /* might as well do one alloc to hold both (user_u and dom_u) */
311 user_u = kmalloc(2048 * sizeof(wchar_t), GFP_KERNEL);
312 if (user_u == NULL)
313 return;
314 dom_u = user_u + 1024;
315
316 /* push_ucs2(NULL, user_u, user_n, (user_l+1)*2,
317 STR_UNICODE|STR_NOALIGN|STR_TERMINATE|STR_UPPER);
318 push_ucs2(NULL, dom_u, domain_n, (domain_l+1)*2,
319 STR_UNICODE|STR_NOALIGN|STR_TERMINATE|STR_UPPER); */
320
321 /* BB user and domain may need to be uppercased */
322 user_l = cifs_strtoUCS(user_u, user_n, 511, nls_codepage);
323 domain_l = cifs_strtoUCS(dom_u, domain_n, 511, nls_codepage);
324
325 user_l++; /* trailing null */
326 domain_l++;
327
328 hmac_md5_init_limK_to_64(owf, 16, &ctx);
329 hmac_md5_update((const unsigned char *) user_u, user_l * 2, &ctx);
330 hmac_md5_update((const unsigned char *) dom_u, domain_l * 2, &ctx);
331 hmac_md5_final(kr_buf, &ctx);
332
333 kfree(user_u);
334}
335#endif
336
337/* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */
338#if 0 /* currently unused */
339static void
340NTLMSSPOWFencrypt(unsigned char passwd[8],
341 unsigned char *ntlmchalresp, unsigned char p24[24])
342{
343 unsigned char p21[21];
344
345 memset(p21, '\0', 21);
346 memcpy(p21, passwd, 8);
347 memset(p21 + 8, 0xbd, 8);
348
349 E_P24(p21, ntlmchalresp, p24);
350}
351#endif
352
353/* Does the NT MD4 hash then des encryption. */
354int
355SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24)
356{
357 int rc;
358 unsigned char p16[16], p21[21];
359
360 memset(p16, '\0', 16);
361 memset(p21, '\0', 21);
362
363 rc = E_md4hash(passwd, p16);
364 if (rc) {
365 cFYI(1, "%s Can't generate NT hash, error: %d", __func__, rc);
366 return rc;
367 }
368 memcpy(p21, p16, 16);
369 rc = E_P24(p21, c8, p24);
370 return rc;
371}
372
373
374/* Does the md5 encryption from the NT hash for NTLMv2. */
375/* These routines will be needed later */
376#if 0
377static void
378SMBOWFencrypt_ntv2(const unsigned char kr[16],
379 const struct data_blob *srv_chal,
380 const struct data_blob *cli_chal, unsigned char resp_buf[16])
381{
382 struct HMACMD5Context ctx;
383
384 hmac_md5_init_limK_to_64(kr, 16, &ctx);
385 hmac_md5_update(srv_chal->data, srv_chal->length, &ctx);
386 hmac_md5_update(cli_chal->data, cli_chal->length, &ctx);
387 hmac_md5_final(resp_buf, &ctx);
388}
389
390static void
391SMBsesskeygen_ntv2(const unsigned char kr[16],
392 const unsigned char *nt_resp, __u8 sess_key[16])
393{
394 struct HMACMD5Context ctx;
395
396 hmac_md5_init_limK_to_64(kr, 16, &ctx);
397 hmac_md5_update(nt_resp, 16, &ctx);
398 hmac_md5_final((unsigned char *) sess_key, &ctx);
399}
400
401static void
402SMBsesskeygen_ntv1(const unsigned char kr[16],
403 const unsigned char *nt_resp, __u8 sess_key[16])
404{
405 mdfour((unsigned char *) sess_key, (unsigned char *) kr, 16);
406}
407#endif
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 Unix SMB/Netbios implementation.
4 Version 1.9.
5 SMB parameters and setup
6 Copyright (C) Andrew Tridgell 1992-2000
7 Copyright (C) Luke Kenneth Casson Leighton 1996-2000
8 Modified by Jeremy Allison 1995.
9 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003
10 Modified by Steve French (sfrench@us.ibm.com) 2002-2003
11
12*/
13
14#include <linux/module.h>
15#include <linux/slab.h>
16#include <linux/fips.h>
17#include <linux/fs.h>
18#include <linux/string.h>
19#include <linux/kernel.h>
20#include <linux/random.h>
21#include <crypto/des.h>
22#include "cifs_fs_sb.h"
23#include "cifs_unicode.h"
24#include "cifspdu.h"
25#include "cifsglob.h"
26#include "cifs_debug.h"
27#include "cifsproto.h"
28
29#ifndef false
30#define false 0
31#endif
32#ifndef true
33#define true 1
34#endif
35
36/* following came from the other byteorder.h to avoid include conflicts */
37#define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
38#define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
39#define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val)))
40
41static void
42str_to_key(unsigned char *str, unsigned char *key)
43{
44 int i;
45
46 key[0] = str[0] >> 1;
47 key[1] = ((str[0] & 0x01) << 6) | (str[1] >> 2);
48 key[2] = ((str[1] & 0x03) << 5) | (str[2] >> 3);
49 key[3] = ((str[2] & 0x07) << 4) | (str[3] >> 4);
50 key[4] = ((str[3] & 0x0F) << 3) | (str[4] >> 5);
51 key[5] = ((str[4] & 0x1F) << 2) | (str[5] >> 6);
52 key[6] = ((str[5] & 0x3F) << 1) | (str[6] >> 7);
53 key[7] = str[6] & 0x7F;
54 for (i = 0; i < 8; i++)
55 key[i] = (key[i] << 1);
56}
57
58static int
59smbhash(unsigned char *out, const unsigned char *in, unsigned char *key)
60{
61 unsigned char key2[8];
62 struct des_ctx ctx;
63
64 str_to_key(key, key2);
65
66 if (fips_enabled) {
67 cifs_dbg(VFS, "FIPS compliance enabled: DES not permitted\n");
68 return -ENOENT;
69 }
70
71 des_expand_key(&ctx, key2, DES_KEY_SIZE);
72 des_encrypt(&ctx, out, in);
73 memzero_explicit(&ctx, sizeof(ctx));
74
75 return 0;
76}
77
78static int
79E_P16(unsigned char *p14, unsigned char *p16)
80{
81 int rc;
82 unsigned char sp8[8] =
83 { 0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25 };
84
85 rc = smbhash(p16, sp8, p14);
86 if (rc)
87 return rc;
88 rc = smbhash(p16 + 8, sp8, p14 + 7);
89 return rc;
90}
91
92static int
93E_P24(unsigned char *p21, const unsigned char *c8, unsigned char *p24)
94{
95 int rc;
96
97 rc = smbhash(p24, c8, p21);
98 if (rc)
99 return rc;
100 rc = smbhash(p24 + 8, c8, p21 + 7);
101 if (rc)
102 return rc;
103 rc = smbhash(p24 + 16, c8, p21 + 14);
104 return rc;
105}
106
107/* produce a md4 message digest from data of length n bytes */
108int
109mdfour(unsigned char *md4_hash, unsigned char *link_str, int link_len)
110{
111 int rc;
112 struct crypto_shash *md4 = NULL;
113 struct sdesc *sdescmd4 = NULL;
114
115 rc = cifs_alloc_hash("md4", &md4, &sdescmd4);
116 if (rc)
117 goto mdfour_err;
118
119 rc = crypto_shash_init(&sdescmd4->shash);
120 if (rc) {
121 cifs_dbg(VFS, "%s: Could not init md4 shash\n", __func__);
122 goto mdfour_err;
123 }
124 rc = crypto_shash_update(&sdescmd4->shash, link_str, link_len);
125 if (rc) {
126 cifs_dbg(VFS, "%s: Could not update with link_str\n", __func__);
127 goto mdfour_err;
128 }
129 rc = crypto_shash_final(&sdescmd4->shash, md4_hash);
130 if (rc)
131 cifs_dbg(VFS, "%s: Could not generate md4 hash\n", __func__);
132
133mdfour_err:
134 cifs_free_hash(&md4, &sdescmd4);
135 return rc;
136}
137
138/*
139 This implements the X/Open SMB password encryption
140 It takes a password, a 8 byte "crypt key" and puts 24 bytes of
141 encrypted password into p24 */
142/* Note that password must be uppercased and null terminated */
143int
144SMBencrypt(unsigned char *passwd, const unsigned char *c8, unsigned char *p24)
145{
146 int rc;
147 unsigned char p14[14], p16[16], p21[21];
148
149 memset(p14, '\0', 14);
150 memset(p16, '\0', 16);
151 memset(p21, '\0', 21);
152
153 memcpy(p14, passwd, 14);
154 rc = E_P16(p14, p16);
155 if (rc)
156 return rc;
157
158 memcpy(p21, p16, 16);
159 rc = E_P24(p21, c8, p24);
160
161 return rc;
162}
163
164/*
165 * Creates the MD4 Hash of the users password in NT UNICODE.
166 */
167
168int
169E_md4hash(const unsigned char *passwd, unsigned char *p16,
170 const struct nls_table *codepage)
171{
172 int rc;
173 int len;
174 __le16 wpwd[129];
175
176 /* Password cannot be longer than 128 characters */
177 if (passwd) /* Password must be converted to NT unicode */
178 len = cifs_strtoUTF16(wpwd, passwd, 128, codepage);
179 else {
180 len = 0;
181 *wpwd = 0; /* Ensure string is null terminated */
182 }
183
184 rc = mdfour(p16, (unsigned char *) wpwd, len * sizeof(__le16));
185 memzero_explicit(wpwd, sizeof(wpwd));
186
187 return rc;
188}
189
190/* Does the NT MD4 hash then des encryption. */
191int
192SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24,
193 const struct nls_table *codepage)
194{
195 int rc;
196 unsigned char p16[16], p21[21];
197
198 memset(p16, '\0', 16);
199 memset(p21, '\0', 21);
200
201 rc = E_md4hash(passwd, p16, codepage);
202 if (rc) {
203 cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n",
204 __func__, rc);
205 return rc;
206 }
207 memcpy(p21, p16, 16);
208 rc = E_P24(p21, c8, p24);
209 return rc;
210}