summaryrefslogtreecommitdiff
path: root/source3/libsmb/smbencrypt.c
blob: 659dba6562588f02ac75231fdb82cb0d373533d6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   SMB parameters and setup
   Copyright (C) Andrew Tridgell 1992-1998
   Modified by Jeremy Allison 1995.
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"

extern int DEBUGLEVEL;

#include "byteorder.h"

/*
   This implements the X/Open SMB password encryption
   It takes a password, a 8 byte "crypt key" and puts 24 bytes of 
   encrypted password into p24 */
void SMBencrypt(uchar *passwd, uchar *c8, uchar *p24)
{
	uchar p21[21];

	lm_owf_gen(passwd, p21);
	SMBOWFencrypt(p21, c8, p24);

#ifdef DEBUG_PASSWORD
	DEBUG(100,("SMBencrypt: lm#, challenge, response\n"));
	dump_data(100, p21, 16);
	dump_data(100, c8, 8);
	dump_data(100, p24, 24);
#endif
}

void SMBNTencrypt(uchar *passwd, uchar *c8, uchar *p24)
{
	uchar p21[21];
 
	memset(p21,'\0',21);
 
	nt_owf_gen(passwd, p21);    
	SMBOWFencrypt(p21, c8, p24);

#ifdef DEBUG_PASSWORD
	DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
	dump_data(100, p21, 16);
	dump_data(100, c8, 8);
	dump_data(100, p24, 24);
#endif
}

/* Routines for Windows NT MD4 Hash functions. */
static int _my_wcslen(int16 *str)
{
	int len = 0;
	while(*str++ != 0)
		len++;
	return len;
}

/*
 * Convert a string into an NT UNICODE string.
 * Note that regardless of processor type 
 * this must be in intel (little-endian)
 * format.
 */
 
static int _my_mbstowcsupper(int16 *dst, const uchar *src, int len)
{
	int i;
	int16 val;
 
	for(i = 0; i < len; i++) {
		val = toupper(*src);
		SSVAL(dst,0,val);
		dst++;
		src++;
		if(val == 0)
			break;
	}
	return i;
}

static int _my_mbstowcs(int16 *dst, const uchar *src, int len)
{
	int i;
	int16 val;
 
	for(i = 0; i < len; i++) {
		val = *src;
		SSVAL(dst,0,val);
		dst++;
		src++;
		if(val == 0)
			break;
	}
	return i;
}

/* 
 * Creates the MD4 Hash of the users password in NT UNICODE.
 */
 
void E_md4hash(uchar *passwd, uchar *p16)
{
	int len;
	int16 wpwd[129];
	
	/* Password cannot be longer than 128 characters */
	len = strlen((char *)passwd);
	if(len > 128)
		len = 128;
	/* Password must be converted to NT unicode */
	_my_mbstowcs(wpwd, passwd, len);
	wpwd[len] = 0; /* Ensure string is null terminated */
	/* Calculate length in bytes */
	len = _my_wcslen(wpwd) * sizeof(int16);

	mdfour(p16, (unsigned char *)wpwd, len);
}

/* Does the LM owf of a user's password */
void lm_owf_genW(const UNISTR2 *pwd, uchar p16[16])
{
	char passwd[15];

	memset(passwd,'\0',15);
	if (pwd != NULL)
	{
		unistr2_to_ascii( passwd, pwd, sizeof(passwd)-1);
	}

	/* Mangle the passwords into Lanman format */
	passwd[14] = '\0';
	strupper(passwd);

	/* Calculate the SMB (lanman) hash functions of the password */

	memset(p16, '\0', 16);
	E_P16((uchar *) passwd, (uchar *)p16);

#ifdef DEBUG_PASSWORD
	DEBUG(100,("nt_lm_owf_gen: pwd, lm#\n"));
	dump_data(120, passwd, strlen(passwd));
	dump_data(100, p16, 16);
#endif
	/* clear out local copy of user's password (just being paranoid). */
	bzero(passwd, sizeof(passwd));
}

/* Does the LM owf of a user's password */
void lm_owf_gen(const char *pwd, uchar p16[16])
{
	char passwd[15];

	memset(passwd,'\0',15);
	if (pwd != NULL)
	{
		safe_strcpy( passwd, pwd, sizeof(passwd)-1);
	}

	/* Mangle the passwords into Lanman format */
	passwd[14] = '\0';
	strupper(passwd);

	/* Calculate the SMB (lanman) hash functions of the password */

	memset(p16, '\0', 16);
	E_P16((uchar *) passwd, (uchar *)p16);

#ifdef DEBUG_PASSWORD
	DEBUG(100,("nt_lm_owf_gen: pwd, lm#\n"));
	dump_data(120, passwd, strlen(passwd));
	dump_data(100, p16, 16);
#endif
	/* clear out local copy of user's password (just being paranoid). */
	bzero(passwd, sizeof(passwd));
}

/* Does both the NT and LM owfs of a user's password */
void nt_owf_genW(const UNISTR2 *pwd, uchar nt_p16[16])
{
	UNISTR2 passwd;

	memset(&passwd,'\0',sizeof(passwd));
	if (pwd != NULL)
	{
		copy_unistr2(&passwd, pwd);
	}

	/* Calculate the MD4 hash (NT compatible) of the password */
	memset(nt_p16, '\0', 16);
	mdfour(nt_p16, (unsigned char *)passwd.buffer, passwd.uni_str_len * 2);

#ifdef DEBUG_PASSWORD
	DEBUG(100,("nt_owf_gen: pwd, nt#\n"));
	dump_data(120, (const char*)passwd.buffer, passwd.uni_str_len * 2);
	dump_data(100, nt_p16, 16);
#endif
	/* clear out local copy of user's password (just being paranoid). */
	memset(&passwd, 0, sizeof(passwd));
}

/* Does both the NT and LM owfs of a user's password */
void nt_owf_gen(const char *pwd, uchar nt_p16[16])
{
	char passwd[130];

	memset(passwd,'\0',130);
	if (pwd != NULL)
	{
		safe_strcpy( passwd, pwd, sizeof(passwd)-1);
	}

	/* Calculate the MD4 hash (NT compatible) of the password */
	memset(nt_p16, '\0', 16);
	E_md4hash((uchar *)passwd, nt_p16);

#ifdef DEBUG_PASSWORD
	DEBUG(100,("nt_owf_gen: pwd, nt#\n"));
	dump_data(120, passwd, strlen(passwd));
	dump_data(100, nt_p16, 16);
#endif
	/* clear out local copy of user's password (just being paranoid). */
	bzero(passwd, sizeof(passwd));
}

/* Does both the NT and LM owfs of a user's UNICODE password */
void nt_lm_owf_genW(const UNISTR2 *pwd, uchar nt_p16[16], uchar lm_p16[16])
{
	nt_owf_genW(pwd, nt_p16);
	lm_owf_genW(pwd, lm_p16);
}

/* Does both the NT and LM owfs of a user's password */
void nt_lm_owf_gen(const char *pwd, uchar nt_p16[16], uchar lm_p16[16])
{
	nt_owf_gen(pwd, nt_p16);
	lm_owf_gen(pwd, lm_p16);
}

/* Does the des encryption from the NT or LM MD4 hash. */
void SMBOWFencrypt(uchar passwd[16], uchar *c8, uchar p24[24])
{
	uchar p21[21];
 
	memset(p21,'\0',21);
 
	memcpy(p21, passwd, 16);    
	E_P24(p21, c8, p24);
}

void SMBOWFencrypt_ntv2(const uchar kr[16], 
				const uchar *srv_chal, int srv_chal_len,
				const uchar *cli_chal, int cli_chal_len,
				char resp_buf[16])
{
	HMACMD5Context ctx;

	hmac_md5_init_limK_to_64(kr, 16, &ctx);
	hmac_md5_update(srv_chal, srv_chal_len, &ctx);
	hmac_md5_update(cli_chal, cli_chal_len, &ctx);
	hmac_md5_final(resp_buf, &ctx);

#ifdef DEBUG_PASSWORD
	DEBUG(100,("SMBOWFencrypt_ntv2: srv_chal, cli_chal, resp_buf\n"));
	dump_data(100, srv_chal, srv_chal_len);
	dump_data(100, cli_chal, cli_chal_len);
	dump_data(100, resp_buf, 16);
#endif
}

void SMBgenclientchals(char *lm_cli_chal,
				char *nt_cli_chal, int *nt_cli_chal_len,
				const char *srv, const char *dom)
{
	NTTIME nt_time;
	int srv_len = strlen(srv);
	int dom_len = strlen(dom);
	fstring server;
	fstring domain;
	fstrcpy(server, srv);
	fstrcpy(domain, dom);
	strupper(server);
	strupper(domain);

	generate_random_buffer(lm_cli_chal, 8, False);
	unix_to_nt_time(&nt_time, time(NULL));

	CVAL(nt_cli_chal,0) = 0x1;
	CVAL(nt_cli_chal,1) = 0x1;
	SSVAL(nt_cli_chal, 2, 0x0);
	SIVAL(nt_cli_chal, 4, 0x0);
	SIVAL(nt_cli_chal, 8, nt_time.low);
	SIVAL(nt_cli_chal, 12, nt_time.high);
	memcpy(nt_cli_chal+16, lm_cli_chal, 8);
	/* fill in offset 24, size of structure, later */

	*nt_cli_chal_len = 28;

	SSVAL(nt_cli_chal, *nt_cli_chal_len, 2);
	*nt_cli_chal_len += 2;
	SSVAL(nt_cli_chal, *nt_cli_chal_len, dom_len*2);
	*nt_cli_chal_len += 2;
	ascii_to_unibuf(nt_cli_chal+(*nt_cli_chal_len), domain, dom_len*2);
	*nt_cli_chal_len += dom_len*2;
	*nt_cli_chal_len += 4 - ((*nt_cli_chal_len) % 4);

	SSVAL(nt_cli_chal, *nt_cli_chal_len, 2);
	*nt_cli_chal_len += 2;
	SSVAL(nt_cli_chal, 30, srv_len*2);
	*nt_cli_chal_len += 2;
	ascii_to_unibuf(nt_cli_chal+(*nt_cli_chal_len), server, srv_len*2);
	*nt_cli_chal_len += srv_len*2;

	SSVAL(nt_cli_chal, 24, (*nt_cli_chal_len)+16);
	SSVAL(nt_cli_chal, 26, (*nt_cli_chal_len)+15);

	DEBUG(100,("SMBgenclientchals: srv %s, dom %s\n", server, domain));
	dump_data(100, nt_cli_chal, *nt_cli_chal_len);
}

void ntv2_owf_gen(const uchar owf[16], 
				const char *user_n,
				const char *domain_n,
				uchar kr_buf[16])
{
	pstring user_u;
	pstring dom_u;
	HMACMD5Context ctx;

	int user_l   = strlen(user_n  );
	int domain_l = strlen(domain_n);

	_my_mbstowcsupper((int16*)user_u, user_n  , user_l*2  );
	_my_mbstowcsupper((int16*)dom_u , domain_n, domain_l*2);

	hmac_md5_init_limK_to_64(owf, 16, &ctx);
	hmac_md5_update(user_u, user_l*2, &ctx);
	hmac_md5_update(dom_u, domain_l*2, &ctx);
	hmac_md5_final(kr_buf, &ctx);

#ifdef DEBUG_PASSWORD
	DEBUG(100,("ntv2_owf_gen: user, domain, owfkey, kr\n"));
	dump_data(100, user_u, user_l*2);
	dump_data(100, dom_u, domain_l*2);
	dump_data(100, owf, 16);
	dump_data(100, kr_buf, 16);
#endif
}

/* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */
void NTLMSSPOWFencrypt(uchar passwd[8], uchar *ntlmchalresp, uchar p24[24])
{
	uchar p21[21];
 
	memset(p21,'\0',21);
	memcpy(p21, passwd, 8);    
	memset(p21 + 8, 0xbd, 8);    

	E_P24(p21, ntlmchalresp, p24);
#ifdef DEBUG_PASSWORD
	DEBUG(100,("NTLMSSPOWFencrypt: p21, c8, p24\n"));
	dump_data(100, p21, 21);
	dump_data(100, ntlmchalresp, 8);
	dump_data(100, p24, 24);
#endif
}

BOOL make_oem_passwd_hash(char data[516], const char *passwd, uchar old_pw_hash[16], BOOL unicode)
{
	int new_pw_len = strlen(passwd) * (unicode ? 2 : 1);

	if (new_pw_len > 512)
	{
		DEBUG(0,("make_oem_passwd_hash: new password is too long.\n"));
		return False;
	}

	/*
	 * Now setup the data area.
	 * We need to generate a random fill
	 * for this area to make it harder to
	 * decrypt. JRA.
	 */
	generate_random_buffer((unsigned char *)data, 516, False);
	if (unicode)
	{
		ascii_to_unibuf(&data[512 - new_pw_len], passwd, new_pw_len);
	}
	else
	{
		fstrcpy( &data[512 - new_pw_len], passwd);
	}
	SIVAL(data, 512, new_pw_len);

#ifdef DEBUG_PASSWORD
	DEBUG(100,("make_oem_passwd_hash\n"));
	dump_data(100, data, 516);
#endif
	SamOEMhash( (unsigned char *)data, (unsigned char *)old_pw_hash, True);

	return True;
}

BOOL nt_decrypt_string2(STRING2 *out, const STRING2 *in, char nt_hash[16])
{
	uchar bufhdr[8];
	int datalen;

	uchar key[16];
	uchar *keyptr = key;
	uchar *keyend = key + sizeof(key);

	uchar *outbuf = (uchar *)out->buffer;
	const uchar *inbuf = (const uchar *)in->buffer;
	const uchar *inbufend;

	mdfour(key, nt_hash, 16);

	smbhash(bufhdr, inbuf, keyptr, 0);
	datalen = IVAL(bufhdr, 0);

	if ((datalen > in->str_str_len) || (datalen > MAX_STRINGLEN))
	{
		DEBUG(0, ("nt_decrypt_string2: failed\n"));
		return False;
	}

	out->str_max_len = out->str_str_len = datalen;
	inbuf += 8;
	inbufend = inbuf + datalen;

	while (inbuf < inbufend)
	{
		keyptr += 7;
		if (keyptr + 7 > keyend)
		{
			keyptr = (keyend - keyptr) + key;
		}

		smbhash(outbuf, inbuf, keyptr, 0);

		inbuf += 8;
		outbuf += 8;
	}

	return True;
}

/*******************************************************************
 creates a DCE/RPC bind authentication response

 - initialises the parse structure.
 - dynamically allocates the header data structure
 - caller is expected to free the header data structure once used.

 ********************************************************************/
void create_ntlmssp_resp(struct pwd_info *pwd,
				char *domain, char *user_name, char *my_name,
				uint32 ntlmssp_cli_flgs,
                                prs_struct *auth_resp)
{
	RPC_AUTH_NTLMSSP_RESP     ntlmssp_resp;
	unsigned char lm_owf[24];
	unsigned char nt_owf[128];
	size_t nt_owf_len;

	pwd_get_lm_nt_owf(pwd, lm_owf, nt_owf, &nt_owf_len);
			
	make_rpc_auth_ntlmssp_resp(&ntlmssp_resp,
			         lm_owf, nt_owf, nt_owf_len,
			         domain, user_name, my_name,
			         ntlmssp_cli_flgs);

	smb_io_rpc_auth_ntlmssp_resp("ntlmssp_resp", &ntlmssp_resp, auth_resp, 0);
	mem_realloc_data(auth_resp->data, auth_resp->offset);
}

/***********************************************************
 decode a password buffer
************************************************************/
BOOL decode_pw_buffer(const char buffer[516], char *new_passwd,
			int new_passwd_size, uint32 *new_pw_len)
{
	/* 
	 * The length of the new password is in the last 4 bytes of
	 * the data buffer.
	 */

	(*new_pw_len) = IVAL(buffer, 512);

#ifdef DEBUG_PASSWORD
	dump_data(100, buffer, 516);
#endif

	if ((*new_pw_len) < 0 || (*new_pw_len) > new_passwd_size - 1)
	{
		DEBUG(0,("check_oem_password: incorrect password length (%d).\n", (*new_pw_len)));
		return False;
	}

	memcpy(new_passwd, &buffer[512-(*new_pw_len)], (*new_pw_len));
	new_passwd[(*new_pw_len)] = '\0';

	return True;
}

/***********************************************************
 encode a password buffer
************************************************************/
BOOL encode_pw_buffer(char buffer[516], const char *new_pass,
			int new_pw_len, BOOL nt_pass_set)
{
	generate_random_buffer(buffer, 516, True);

	if (nt_pass_set)
	{
		/*
		 * nt passwords are in unicode.  last char overwrites NULL
		 * in ascii_to_unibuf, so use SIVAL *afterwards*.
		 */
		new_pw_len *= 2;
		ascii_to_unibuf(&buffer[512-new_pw_len], new_pass, new_pw_len);
	}
	else
	{
		memcpy(&buffer[512-new_pw_len], new_pass, new_pw_len);
	}

	/* 
	 * The length of the new password is in the last 4 bytes of
	 * the data buffer.
	 */

	SIVAL(buffer, 512, new_pw_len);

#ifdef DEBUG_PASSWORD
	dump_data(100, buffer, 516);
#endif

	return True;
}