summaryrefslogtreecommitdiff
path: root/source3/libsmb/smbencrypt.c
blob: 95434d0ae4e102f42a54377906721b280bc3d6fa (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
/* 
   Unix SMB/CIFS implementation.
   SMB parameters and setup
   Copyright (C) Andrew Tridgell 1992-1998
   Modified by Jeremy Allison 1995.
   Copyright (C) Jeremy Allison 1995-2000.
   Copyright (C) Luke Kennethc Casson Leighton 1996-2000.
   
   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"
#include "byteorder.h"

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

	memset(p21,'\0',21);
	E_deshash(passwd, p21); 

	SMBOWFencrypt(p21, c8, p24);

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

/**
 * Creates the MD4 Hash of the users password in NT UNICODE.
 * @param passwd password in 'unix' charset.
 * @param p16 return password hashed with md4, caller allocated 16 byte buffer
 */
 
void E_md4hash(const char *passwd, uchar p16[16])
{
	int len;
	smb_ucs2_t wpwd[129];
	
	/* Password must be converted to NT unicode - null terminated. */
	push_ucs2(NULL, wpwd, (const char *)passwd, 256, STR_UNICODE|STR_NOALIGN|STR_TERMINATE);
	/* Calculate length in bytes */
	len = strlen_w(wpwd) * sizeof(int16);

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

/**
 * Creates the MD4 Hash of the users password in NT UNICODE.
 * @param passwd password in 'unix' charset.
 * @param p16 return password hashed with md4, caller allocated 16 byte buffer
 */
 
void E_deshash(const char *passwd, uchar p16[16])
{
	uchar dospwd[15]; /* Password must not be > 14 chars long. */
	ZERO_STRUCT(dospwd);
	ZERO_STRUCTP(p16);
	
	/* Password must be converted to DOS charset - null terminated. */
	push_ascii(dospwd, (const char *)passwd, sizeof(dospwd), STR_UPPER|STR_TERMINATE);

	E_P16(dospwd, p16);

	ZERO_STRUCT(dospwd);	
}

/**
 * Creates the MD4 and DES (LM) Hash of the users password.  
 * MD4 is of the NT Unicode, DES is of the DOS UPPERCASE password.
 * @param passwd password in 'unix' charset.
 * @param nt_p16 return password hashed with md4, caller allocated 16 byte buffer
 * @param p16 return password hashed with des, caller allocated 16 byte buffer
 */
 
/* 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 p16[16])
{
	/* Calculate the MD4 hash (NT compatible) of the password */
	memset(nt_p16, '\0', 16);
	E_md4hash(pwd, nt_p16);

#ifdef DEBUG_PASSWORD
	DEBUG(100,("nt_lm_owf_gen: pwd, nt#\n"));
	dump_data(120, pwd, strlen(pwd));
	dump_data(100, (char *)nt_p16, 16);
#endif

	E_deshash(pwd, (uchar *)p16);

#ifdef DEBUG_PASSWORD
	DEBUG(100,("nt_lm_owf_gen: pwd, lm#\n"));
	dump_data(120, pwd, strlen(pwd));
	dump_data(100, (char *)p16, 16);
#endif
}

/* Does both the NTLMv2 owfs of a user's password */
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);

	push_ucs2(NULL, user_u, user_n, (user_l+1)*2, STR_UNICODE|STR_NOALIGN|STR_TERMINATE|STR_UPPER);
	push_ucs2(NULL, dom_u, domain_n, (domain_l+1)*2, STR_UNICODE|STR_NOALIGN|STR_TERMINATE|STR_UPPER);

	hmac_md5_init_limK_to_64(owf, 16, &ctx);
	hmac_md5_update((const unsigned char *)user_u, user_l * 2, &ctx);
	hmac_md5_update((const unsigned char *)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 NT or LM MD4 hash. */
void SMBOWFencrypt(const uchar passwd[16], const uchar *c8, uchar p24[24])
{
	uchar p21[21];
 
	memset(p21,'\0',21);
 
	memcpy(p21, passwd, 16);    
	E_P24(p21, c8, p24);
}

/* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */
void NTLMSSPOWFencrypt(const uchar passwd[8], const 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, (char *)p21, 21);
	dump_data(100, (const char *)ntlmchalresp, 8);
	dump_data(100, (char *)p24, 24);
#endif
}


/* Does the NT MD4 hash then des encryption. */
 
void SMBNTencrypt(const uchar *passwd, uchar *c8, uchar *p24)
{
	uchar p21[21];
 
	memset(p21,'\0',21);
 
	E_md4hash(passwd, p21);    
	SMBOWFencrypt(p21, c8, p24);

#ifdef DEBUG_PASSWORD
	DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
	dump_data(100, (char *)p21, 16);
	dump_data(100, (char *)c8, 8);
	dump_data(100, (char *)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);
	push_string(NULL, &data[512 - new_pw_len], passwd, new_pw_len, 
		    STR_NOALIGN | (unicode?STR_UNICODE:STR_ASCII));
	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, 516);

	return True;
}

/* Does the md5 encryption from the NT hash for NTLMv2. */
void SMBOWFencrypt_ntv2(const uchar kr[16],
			const DATA_BLOB srv_chal,
			const DATA_BLOB cli_chal,
			char resp_buf[16])
{
	HMACMD5Context ctx;

	hmac_md5_init_limK_to_64(kr, 16, &ctx);
	hmac_md5_update(srv_chal.data, srv_chal.length, &ctx);
	hmac_md5_update(cli_chal.data, cli_chal.length, &ctx);
	hmac_md5_final((unsigned char *)resp_buf, &ctx);

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

void SMBsesskeygen_ntv2(const uchar kr[16],
			const uchar * nt_resp, uint8 sess_key[16])
{
	HMACMD5Context ctx;

	hmac_md5_init_limK_to_64(kr, 16, &ctx);
	hmac_md5_update(nt_resp, 16, &ctx);
	hmac_md5_final((unsigned char *)sess_key, &ctx);

#ifdef DEBUG_PASSWORD
	DEBUG(100, ("SMBsesskeygen_ntv2:\n"));
	dump_data(100, sess_key, 16);
#endif
}

void SMBsesskeygen_ntv1(const uchar kr[16],
			const uchar * nt_resp, uint8 sess_key[16])
{
	mdfour((unsigned char *)sess_key, kr, 16);

#ifdef DEBUG_PASSWORD
	DEBUG(100, ("SMBsesskeygen_ntv1:\n"));
	dump_data(100, sess_key, 16);
#endif
}

/***********************************************************
 encode a password buffer.  The caller gets to figure out 
 what to put in it.
************************************************************/
BOOL encode_pw_buffer(char buffer[516], char *new_pw, int new_pw_length)
{
	generate_random_buffer((unsigned char *)buffer, 516, True);

	memcpy(&buffer[512 - new_pw_length], new_pw, new_pw_length);

	/* 
	 * The length of the new password is in the last 4 bytes of
	 * the data buffer.
	 */
	SIVAL(buffer, 512, new_pw_length);

	return True;
}

/***********************************************************
 decode a password buffer
 *new_pw_len is the length in bytes of the possibly mulitbyte
 returned password including termination.
************************************************************/
BOOL decode_pw_buffer(char in_buffer[516], char *new_pwrd,
		      int new_pwrd_size, uint32 *new_pw_len)
{
	int byte_len=0;

	/*
	  Warning !!! : This function is called from some rpc call.
	  The password IN the buffer is a UNICODE string.
	  The password IN new_pwrd is an ASCII string
	  If you reuse that code somewhere else check first.
	*/

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

	byte_len = IVAL(in_buffer, 512);

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

	/* Password cannot be longer than 128 characters */
	if ( (byte_len < 0) || (byte_len > new_pwrd_size - 1)) {
		DEBUG(0, ("decode_pw_buffer: incorrect password length (%d).\n", byte_len));
		DEBUG(0, ("decode_pw_buffer: check that 'encrypt passwords = yes'\n"));
		return False;
	}

	/* decode into the return buffer.  Buffer must be a pstring */
 	*new_pw_len = pull_string(NULL, new_pwrd, &in_buffer[512 - byte_len], new_pwrd_size, byte_len, STR_UNICODE);

#ifdef DEBUG_PASSWORD
	DEBUG(100,("decode_pw_buffer: new_pwrd: "));
	dump_data(100, (char *)new_pwrd, *new_pw_len);
	DEBUG(100,("multibyte len:%d\n", *new_pw_len));
	DEBUG(100,("original char len:%d\n", byte_len/2));
#endif
	
	return True;
}

/***********************************************************
 SMB signing - setup the MAC key.
************************************************************/

void cli_calculate_mac_key(struct cli_state *cli, const unsigned char *ntpasswd, const uchar resp[24])
{
	/* Get first 16 bytes. */
	E_md4hash(ntpasswd,&cli->sign_info.mac_key[0]);
	memcpy(&cli->sign_info.mac_key[16],resp,24);
	cli->sign_info.mac_key_len = 40;
	cli->sign_info.use_smb_signing = True;

	/* These calls are INCONPATIBLE with SMB signing */
	cli->readbraw_supported = False;
	cli->writebraw_supported = False;    

	/* Reset the sequence number in case we had a previous (aborted) attempt */
	cli->sign_info.send_seq_num = 0;
}

/***********************************************************
 SMB signing - calculate a MAC to send.
************************************************************/

void cli_caclulate_sign_mac(struct cli_state *cli)
{
	unsigned char calc_md5_mac[16];
	struct MD5Context md5_ctx;

	if (!cli->sign_info.use_smb_signing) {
		return;
	}

	/*
	 * Firstly put the sequence number into the first 4 bytes.
	 * and zero out the next 4 bytes.
	 */
	SIVAL(cli->outbuf, smb_ss_field, cli->sign_info.send_seq_num);
	SIVAL(cli->outbuf, smb_ss_field + 4, 0);

	/* Calculate the 16 byte MAC and place first 8 bytes into the field. */
	MD5Init(&md5_ctx);
	MD5Update(&md5_ctx, cli->sign_info.mac_key, cli->sign_info.mac_key_len);
	MD5Update(&md5_ctx, cli->outbuf + 4, smb_len(cli->outbuf));
	MD5Final(calc_md5_mac, &md5_ctx);

	memcpy(&cli->outbuf[smb_ss_field], calc_md5_mac, 8);
	cli->sign_info.send_seq_num++;
	cli->sign_info.reply_seq_num = cli->sign_info.send_seq_num;
	cli->sign_info.send_seq_num++;
}