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[Samba/gebeck_regimport.git] / libcli / auth / smbencrypt.c
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1 /*
2 Unix SMB/CIFS implementation.
3 SMB parameters and setup
4 Copyright (C) Andrew Tridgell 1992-1998
5 Modified by Jeremy Allison 1995.
6 Copyright (C) Jeremy Allison 1995-2000.
7 Copyright (C) Luke Kennethc Casson Leighton 1996-2000.
8 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 #include "includes.h"
25 #include "system/time.h"
26 #include "../libcli/auth/msrpc_parse.h"
27 #include "../lib/crypto/crypto.h"
28 #include "../libcli/auth/libcli_auth.h"
29 #include "../librpc/gen_ndr/ntlmssp.h"
31 void SMBencrypt_hash(const uint8_t lm_hash[16], const uint8_t *c8, uint8_t p24[24])
33 uint8_t p21[21];
35 memset(p21,'\0',21);
36 memcpy(p21, lm_hash, 16);
38 SMBOWFencrypt(p21, c8, p24);
40 #ifdef DEBUG_PASSWORD
41 DEBUG(100,("SMBencrypt_hash: lm#, challenge, response\n"));
42 dump_data(100, p21, 16);
43 dump_data(100, c8, 8);
44 dump_data(100, p24, 24);
45 #endif
49 This implements the X/Open SMB password encryption
50 It takes a password ('unix' string), a 8 byte "crypt key"
51 and puts 24 bytes of encrypted password into p24
53 Returns False if password must have been truncated to create LM hash
56 bool SMBencrypt(const char *passwd, const uint8_t *c8, uint8_t p24[24])
58 bool ret;
59 uint8_t lm_hash[16];
61 ret = E_deshash(passwd, lm_hash);
62 SMBencrypt_hash(lm_hash, c8, p24);
63 return ret;
66 /**
67 * Creates the MD4 Hash of the users password in NT UNICODE.
68 * @param passwd password in 'unix' charset.
69 * @param p16 return password hashed with md4, caller allocated 16 byte buffer
72 bool E_md4hash(const char *passwd, uint8_t p16[16])
74 size_t len;
75 smb_ucs2_t *wpwd;
76 bool ret;
78 ret = push_ucs2_talloc(NULL, &wpwd, passwd, &len);
79 if (!ret || len < 2) {
80 /* We don't want to return fixed data, as most callers
81 * don't check */
82 mdfour(p16, (const uint8_t *)passwd, strlen(passwd));
83 return false;
86 len -= 2;
87 mdfour(p16, (const uint8_t *)wpwd, len);
89 talloc_free(wpwd);
90 return true;
93 /**
94 * Creates the MD5 Hash of a combination of 16 byte salt and 16 byte NT hash.
95 * @param 16 byte salt.
96 * @param 16 byte NT hash.
97 * @param 16 byte return hashed with md5, caller allocated 16 byte buffer
100 void E_md5hash(const uint8_t salt[16], const uint8_t nthash[16], uint8_t hash_out[16])
102 struct MD5Context tctx;
103 MD5Init(&tctx);
104 MD5Update(&tctx, salt, 16);
105 MD5Update(&tctx, nthash, 16);
106 MD5Final(hash_out, &tctx);
110 * Creates the DES forward-only Hash of the users password in DOS ASCII charset
111 * @param passwd password in 'unix' charset.
112 * @param p16 return password hashed with DES, caller allocated 16 byte buffer
113 * @return false if password was > 14 characters, and therefore may be incorrect, otherwise true
114 * @note p16 is filled in regardless
117 bool E_deshash(const char *passwd, uint8_t p16[16])
119 bool ret = true;
120 char dospwd[256];
121 ZERO_STRUCT(dospwd);
123 /* Password must be converted to DOS charset - null terminated, uppercase. */
124 push_string(dospwd, passwd, sizeof(dospwd), STR_ASCII|STR_UPPER|STR_TERMINATE);
126 /* Only the first 14 chars are considered, password need not be null terminated. */
127 E_P16((const uint8_t *)dospwd, p16);
129 if (strlen(dospwd) > 14) {
130 ret = false;
133 ZERO_STRUCT(dospwd);
135 return ret;
139 * Creates the MD4 and DES (LM) Hash of the users password.
140 * MD4 is of the NT Unicode, DES is of the DOS UPPERCASE password.
141 * @param passwd password in 'unix' charset.
142 * @param nt_p16 return password hashed with md4, caller allocated 16 byte buffer
143 * @param p16 return password hashed with des, caller allocated 16 byte buffer
146 /* Does both the NT and LM owfs of a user's password */
147 void nt_lm_owf_gen(const char *pwd, uint8_t nt_p16[16], uint8_t p16[16])
149 /* Calculate the MD4 hash (NT compatible) of the password */
150 memset(nt_p16, '\0', 16);
151 E_md4hash(pwd, nt_p16);
153 #ifdef DEBUG_PASSWORD
154 DEBUG(100,("nt_lm_owf_gen: pwd, nt#\n"));
155 dump_data(120, (const uint8_t *)pwd, strlen(pwd));
156 dump_data(100, nt_p16, 16);
157 #endif
159 E_deshash(pwd, (uint8_t *)p16);
161 #ifdef DEBUG_PASSWORD
162 DEBUG(100,("nt_lm_owf_gen: pwd, lm#\n"));
163 dump_data(120, (const uint8_t *)pwd, strlen(pwd));
164 dump_data(100, p16, 16);
165 #endif
168 /* Does both the NTLMv2 owfs of a user's password */
169 bool ntv2_owf_gen(const uint8_t owf[16],
170 const char *user_in, const char *domain_in,
171 bool upper_case_domain, /* Transform the domain into UPPER case */
172 uint8_t kr_buf[16])
174 smb_ucs2_t *user;
175 smb_ucs2_t *domain;
176 size_t user_byte_len;
177 size_t domain_byte_len;
178 bool ret;
180 HMACMD5Context ctx;
181 TALLOC_CTX *mem_ctx = talloc_init("ntv2_owf_gen for %s\\%s", domain_in, user_in);
183 if (!mem_ctx) {
184 return false;
187 if (!user_in) {
188 user_in = "";
191 if (!domain_in) {
192 domain_in = "";
195 user_in = strupper_talloc(mem_ctx, user_in);
196 if (user_in == NULL) {
197 talloc_free(mem_ctx);
198 return false;
201 if (upper_case_domain) {
202 domain_in = strupper_talloc(mem_ctx, domain_in);
203 if (domain_in == NULL) {
204 talloc_free(mem_ctx);
205 return false;
209 ret = push_ucs2_talloc(mem_ctx, &user, user_in, &user_byte_len );
210 if (!ret) {
211 DEBUG(0, ("push_uss2_talloc() for user failed)\n"));
212 talloc_free(mem_ctx);
213 return false;
216 ret = push_ucs2_talloc(mem_ctx, &domain, domain_in, &domain_byte_len);
217 if (!ret) {
218 DEBUG(0, ("push_ucs2_talloc() for domain failed\n"));
219 talloc_free(mem_ctx);
220 return false;
223 SMB_ASSERT(user_byte_len >= 2);
224 SMB_ASSERT(domain_byte_len >= 2);
226 /* We don't want null termination */
227 user_byte_len = user_byte_len - 2;
228 domain_byte_len = domain_byte_len - 2;
230 hmac_md5_init_limK_to_64(owf, 16, &ctx);
231 hmac_md5_update((uint8_t *)user, user_byte_len, &ctx);
232 hmac_md5_update((uint8_t *)domain, domain_byte_len, &ctx);
233 hmac_md5_final(kr_buf, &ctx);
235 #ifdef DEBUG_PASSWORD
236 DEBUG(100, ("ntv2_owf_gen: user, domain, owfkey, kr\n"));
237 dump_data(100, (uint8_t *)user, user_byte_len);
238 dump_data(100, (uint8_t *)domain, domain_byte_len);
239 dump_data(100, owf, 16);
240 dump_data(100, kr_buf, 16);
241 #endif
243 talloc_free(mem_ctx);
244 return true;
247 /* Does the des encryption from the NT or LM MD4 hash. */
248 void SMBOWFencrypt(const uint8_t passwd[16], const uint8_t *c8, uint8_t p24[24])
250 uint8_t p21[21];
252 ZERO_STRUCT(p21);
254 memcpy(p21, passwd, 16);
255 E_P24(p21, c8, p24);
258 /* Does the des encryption. */
260 void SMBNTencrypt_hash(const uint8_t nt_hash[16], uint8_t *c8, uint8_t *p24)
262 uint8_t p21[21];
264 memset(p21,'\0',21);
265 memcpy(p21, nt_hash, 16);
266 SMBOWFencrypt(p21, c8, p24);
268 #ifdef DEBUG_PASSWORD
269 DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
270 dump_data(100, p21, 16);
271 dump_data(100, c8, 8);
272 dump_data(100, p24, 24);
273 #endif
276 /* Does the NT MD4 hash then des encryption. Plaintext version of the above. */
278 void SMBNTencrypt(const char *passwd, uint8_t *c8, uint8_t *p24)
280 uint8_t nt_hash[16];
281 E_md4hash(passwd, nt_hash);
282 SMBNTencrypt_hash(nt_hash, c8, p24);
286 /* Does the md5 encryption from the Key Response for NTLMv2. */
287 void SMBOWFencrypt_ntv2(const uint8_t kr[16],
288 const DATA_BLOB *srv_chal,
289 const DATA_BLOB *smbcli_chal,
290 uint8_t resp_buf[16])
292 HMACMD5Context ctx;
294 hmac_md5_init_limK_to_64(kr, 16, &ctx);
295 hmac_md5_update(srv_chal->data, srv_chal->length, &ctx);
296 hmac_md5_update(smbcli_chal->data, smbcli_chal->length, &ctx);
297 hmac_md5_final(resp_buf, &ctx);
299 #ifdef DEBUG_PASSWORD
300 DEBUG(100, ("SMBOWFencrypt_ntv2: srv_chal, smbcli_chal, resp_buf\n"));
301 dump_data(100, srv_chal->data, srv_chal->length);
302 dump_data(100, smbcli_chal->data, smbcli_chal->length);
303 dump_data(100, resp_buf, 16);
304 #endif
307 void SMBsesskeygen_ntv2(const uint8_t kr[16],
308 const uint8_t * nt_resp, uint8_t sess_key[16])
310 /* a very nice, 128 bit, variable session key */
312 HMACMD5Context ctx;
314 hmac_md5_init_limK_to_64(kr, 16, &ctx);
315 hmac_md5_update(nt_resp, 16, &ctx);
316 hmac_md5_final((uint8_t *)sess_key, &ctx);
318 #ifdef DEBUG_PASSWORD
319 DEBUG(100, ("SMBsesskeygen_ntv2:\n"));
320 dump_data(100, sess_key, 16);
321 #endif
324 void SMBsesskeygen_ntv1(const uint8_t kr[16], uint8_t sess_key[16])
326 /* yes, this session key does not change - yes, this
327 is a problem - but it is 128 bits */
329 mdfour((uint8_t *)sess_key, kr, 16);
331 #ifdef DEBUG_PASSWORD
332 DEBUG(100, ("SMBsesskeygen_ntv1:\n"));
333 dump_data(100, sess_key, 16);
334 #endif
337 void SMBsesskeygen_lm_sess_key(const uint8_t lm_hash[16],
338 const uint8_t lm_resp[24], /* only uses 8 */
339 uint8_t sess_key[16])
341 /* Calculate the LM session key (effective length 40 bits,
342 but changes with each session) */
343 uint8_t p24[24];
344 uint8_t partial_lm_hash[14];
346 memcpy(partial_lm_hash, lm_hash, 8);
347 memset(partial_lm_hash + 8, 0xbd, 6);
349 des_crypt56(p24, lm_resp, partial_lm_hash, 1);
350 des_crypt56(p24+8, lm_resp, partial_lm_hash + 7, 1);
352 memcpy(sess_key, p24, 16);
354 #ifdef DEBUG_PASSWORD
355 DEBUG(100, ("SMBsesskeygen_lm_sess_key: \n"));
356 dump_data(100, sess_key, 16);
357 #endif
360 DATA_BLOB NTLMv2_generate_names_blob(TALLOC_CTX *mem_ctx,
361 const char *hostname,
362 const char *domain)
364 DATA_BLOB names_blob = data_blob_talloc(mem_ctx, NULL, 0);
366 msrpc_gen(mem_ctx, &names_blob,
367 "aaa",
368 MsvAvNbDomainName, domain,
369 MsvAvNbComputerName, hostname,
370 MsvAvEOL, "");
371 return names_blob;
374 static DATA_BLOB NTLMv2_generate_client_data(TALLOC_CTX *mem_ctx, const DATA_BLOB *names_blob)
376 uint8_t client_chal[8];
377 DATA_BLOB response = data_blob(NULL, 0);
378 uint8_t long_date[8];
379 NTTIME nttime;
381 unix_to_nt_time(&nttime, time(NULL));
383 generate_random_buffer(client_chal, sizeof(client_chal));
385 push_nttime(long_date, 0, nttime);
387 /* See http://www.ubiqx.org/cifs/SMB.html#SMB.8.5 */
389 msrpc_gen(mem_ctx, &response, "ddbbdb",
390 0x00000101, /* Header */
391 0, /* 'Reserved' */
392 long_date, 8, /* Timestamp */
393 client_chal, 8, /* client challenge */
394 0, /* Unknown */
395 names_blob->data, names_blob->length); /* End of name list */
397 return response;
400 static DATA_BLOB NTLMv2_generate_response(TALLOC_CTX *out_mem_ctx,
401 const uint8_t ntlm_v2_hash[16],
402 const DATA_BLOB *server_chal,
403 const DATA_BLOB *names_blob)
405 uint8_t ntlmv2_response[16];
406 DATA_BLOB ntlmv2_client_data;
407 DATA_BLOB final_response;
409 TALLOC_CTX *mem_ctx = talloc_named(out_mem_ctx, 0,
410 "NTLMv2_generate_response internal context");
412 if (!mem_ctx) {
413 return data_blob(NULL, 0);
416 /* NTLMv2 */
417 /* generate some data to pass into the response function - including
418 the hostname and domain name of the server */
419 ntlmv2_client_data = NTLMv2_generate_client_data(mem_ctx, names_blob);
421 /* Given that data, and the challenge from the server, generate a response */
422 SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, &ntlmv2_client_data, ntlmv2_response);
424 final_response = data_blob_talloc(out_mem_ctx, NULL, sizeof(ntlmv2_response) + ntlmv2_client_data.length);
426 memcpy(final_response.data, ntlmv2_response, sizeof(ntlmv2_response));
428 memcpy(final_response.data+sizeof(ntlmv2_response),
429 ntlmv2_client_data.data, ntlmv2_client_data.length);
431 talloc_free(mem_ctx);
433 return final_response;
436 static DATA_BLOB LMv2_generate_response(TALLOC_CTX *mem_ctx,
437 const uint8_t ntlm_v2_hash[16],
438 const DATA_BLOB *server_chal)
440 uint8_t lmv2_response[16];
441 DATA_BLOB lmv2_client_data = data_blob_talloc(mem_ctx, NULL, 8);
442 DATA_BLOB final_response = data_blob_talloc(mem_ctx, NULL,24);
444 /* LMv2 */
445 /* client-supplied random data */
446 generate_random_buffer(lmv2_client_data.data, lmv2_client_data.length);
448 /* Given that data, and the challenge from the server, generate a response */
449 SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, &lmv2_client_data, lmv2_response);
450 memcpy(final_response.data, lmv2_response, sizeof(lmv2_response));
452 /* after the first 16 bytes is the random data we generated above,
453 so the server can verify us with it */
454 memcpy(final_response.data+sizeof(lmv2_response),
455 lmv2_client_data.data, lmv2_client_data.length);
457 data_blob_free(&lmv2_client_data);
459 return final_response;
462 bool SMBNTLMv2encrypt_hash(TALLOC_CTX *mem_ctx,
463 const char *user, const char *domain, const uint8_t nt_hash[16],
464 const DATA_BLOB *server_chal,
465 const DATA_BLOB *names_blob,
466 DATA_BLOB *lm_response, DATA_BLOB *nt_response,
467 DATA_BLOB *lm_session_key, DATA_BLOB *user_session_key)
469 uint8_t ntlm_v2_hash[16];
471 /* We don't use the NT# directly. Instead we use it mashed up with
472 the username and domain.
473 This prevents username swapping during the auth exchange
475 if (!ntv2_owf_gen(nt_hash, user, domain, true, ntlm_v2_hash)) {
476 return false;
479 if (nt_response) {
480 *nt_response = NTLMv2_generate_response(mem_ctx,
481 ntlm_v2_hash, server_chal,
482 names_blob);
483 if (user_session_key) {
484 *user_session_key = data_blob_talloc(mem_ctx, NULL, 16);
486 /* The NTLMv2 calculations also provide a session key, for signing etc later */
487 /* use only the first 16 bytes of nt_response for session key */
488 SMBsesskeygen_ntv2(ntlm_v2_hash, nt_response->data, user_session_key->data);
492 /* LMv2 */
494 if (lm_response) {
495 *lm_response = LMv2_generate_response(mem_ctx,
496 ntlm_v2_hash, server_chal);
497 if (lm_session_key) {
498 *lm_session_key = data_blob_talloc(mem_ctx, NULL, 16);
500 /* The NTLMv2 calculations also provide a session key, for signing etc later */
501 /* use only the first 16 bytes of lm_response for session key */
502 SMBsesskeygen_ntv2(ntlm_v2_hash, lm_response->data, lm_session_key->data);
506 return true;
509 bool SMBNTLMv2encrypt(TALLOC_CTX *mem_ctx,
510 const char *user, const char *domain,
511 const char *password,
512 const DATA_BLOB *server_chal,
513 const DATA_BLOB *names_blob,
514 DATA_BLOB *lm_response, DATA_BLOB *nt_response,
515 DATA_BLOB *lm_session_key, DATA_BLOB *user_session_key)
517 uint8_t nt_hash[16];
518 E_md4hash(password, nt_hash);
520 return SMBNTLMv2encrypt_hash(mem_ctx,
521 user, domain, nt_hash, server_chal, names_blob,
522 lm_response, nt_response, lm_session_key, user_session_key);
525 /***********************************************************
526 encode a password buffer with a unicode password. The buffer
527 is filled with random data to make it harder to attack.
528 ************************************************************/
529 bool encode_pw_buffer(uint8_t buffer[516], const char *password, int string_flags)
531 uint8_t new_pw[512];
532 size_t new_pw_len;
534 /* the incoming buffer can be any alignment. */
535 string_flags |= STR_NOALIGN;
537 new_pw_len = push_string(new_pw,
538 password,
539 sizeof(new_pw), string_flags);
541 memcpy(&buffer[512 - new_pw_len], new_pw, new_pw_len);
543 generate_random_buffer(buffer, 512 - new_pw_len);
546 * The length of the new password is in the last 4 bytes of
547 * the data buffer.
549 SIVAL(buffer, 512, new_pw_len);
550 ZERO_STRUCT(new_pw);
551 return true;
555 /***********************************************************
556 decode a password buffer
557 *new_pw_len is the length in bytes of the possibly mulitbyte
558 returned password including termination.
559 ************************************************************/
561 bool decode_pw_buffer(TALLOC_CTX *ctx,
562 uint8_t in_buffer[516],
563 char **pp_new_pwrd,
564 size_t *new_pw_len,
565 charset_t string_charset)
567 int byte_len=0;
569 *pp_new_pwrd = NULL;
570 *new_pw_len = 0;
573 Warning !!! : This function is called from some rpc call.
574 The password IN the buffer may be a UNICODE string.
575 The password IN new_pwrd is an ASCII string
576 If you reuse that code somewhere else check first.
579 /* The length of the new password is in the last 4 bytes of the data buffer. */
581 byte_len = IVAL(in_buffer, 512);
583 #ifdef DEBUG_PASSWORD
584 dump_data(100, in_buffer, 516);
585 #endif
587 /* Password cannot be longer than the size of the password buffer */
588 if ( (byte_len < 0) || (byte_len > 512)) {
589 DEBUG(0, ("decode_pw_buffer: incorrect password length (%d).\n", byte_len));
590 DEBUG(0, ("decode_pw_buffer: check that 'encrypt passwords = yes'\n"));
591 return false;
594 /* decode into the return buffer. */
595 if (!convert_string_talloc(ctx, string_charset, CH_UNIX,
596 &in_buffer[512 - byte_len],
597 byte_len,
598 (void *)pp_new_pwrd,
599 new_pw_len,
600 false)) {
601 DEBUG(0, ("decode_pw_buffer: failed to convert incoming password\n"));
602 return false;
605 #ifdef DEBUG_PASSWORD
606 DEBUG(100,("decode_pw_buffer: new_pwrd: "));
607 dump_data(100, (uint8_t *)*pp_new_pwrd, *new_pw_len);
608 DEBUG(100,("multibyte len:%lu\n", (unsigned long int)*new_pw_len));
609 DEBUG(100,("original char len:%d\n", byte_len/2));
610 #endif
612 return true;
615 /***********************************************************
616 Decode an arc4 encrypted password change buffer.
617 ************************************************************/
619 void encode_or_decode_arc4_passwd_buffer(unsigned char pw_buf[532], const DATA_BLOB *psession_key)
621 struct MD5Context tctx;
622 unsigned char key_out[16];
624 /* Confounder is last 16 bytes. */
626 MD5Init(&tctx);
627 MD5Update(&tctx, &pw_buf[516], 16);
628 MD5Update(&tctx, psession_key->data, psession_key->length);
629 MD5Final(key_out, &tctx);
630 /* arc4 with key_out. */
631 arcfour_crypt(pw_buf, key_out, 516);
634 /***********************************************************
635 encode a password buffer with an already unicode password. The
636 rest of the buffer is filled with random data to make it harder to attack.
637 ************************************************************/
638 bool set_pw_in_buffer(uint8_t buffer[516], DATA_BLOB *password)
640 if (password->length > 512) {
641 return false;
644 memcpy(&buffer[512 - password->length], password->data, password->length);
646 generate_random_buffer(buffer, 512 - password->length);
649 * The length of the new password is in the last 4 bytes of
650 * the data buffer.
652 SIVAL(buffer, 512, password->length);
653 return true;
656 /***********************************************************
657 decode a password buffer
658 *new_pw_size is the length in bytes of the extracted unicode password
659 ************************************************************/
660 bool extract_pw_from_buffer(TALLOC_CTX *mem_ctx,
661 uint8_t in_buffer[516], DATA_BLOB *new_pass)
663 int byte_len=0;
665 /* The length of the new password is in the last 4 bytes of the data buffer. */
667 byte_len = IVAL(in_buffer, 512);
669 #ifdef DEBUG_PASSWORD
670 dump_data(100, in_buffer, 516);
671 #endif
673 /* Password cannot be longer than the size of the password buffer */
674 if ( (byte_len < 0) || (byte_len > 512)) {
675 return false;
678 *new_pass = data_blob_talloc(mem_ctx, &in_buffer[512 - byte_len], byte_len);
680 if (!new_pass->data) {
681 return false;
684 return true;
688 /* encode a wkssvc_PasswordBuffer:
690 * similar to samr_CryptPasswordEx. Different: 8byte confounder (instead of
691 * 16byte), confounder in front of the 516 byte buffer (instead of after that
692 * buffer), calling MD5Update() first with session_key and then with confounder
693 * (vice versa in samr) - Guenther */
695 void encode_wkssvc_join_password_buffer(TALLOC_CTX *mem_ctx,
696 const char *pwd,
697 DATA_BLOB *session_key,
698 struct wkssvc_PasswordBuffer **pwd_buf)
700 uint8_t buffer[516];
701 struct MD5Context ctx;
702 struct wkssvc_PasswordBuffer *my_pwd_buf = NULL;
703 DATA_BLOB confounded_session_key;
704 int confounder_len = 8;
705 uint8_t confounder[8];
707 my_pwd_buf = talloc_zero(mem_ctx, struct wkssvc_PasswordBuffer);
708 if (!my_pwd_buf) {
709 return;
712 confounded_session_key = data_blob_talloc(mem_ctx, NULL, 16);
714 encode_pw_buffer(buffer, pwd, STR_UNICODE);
716 generate_random_buffer((uint8_t *)confounder, confounder_len);
718 MD5Init(&ctx);
719 MD5Update(&ctx, session_key->data, session_key->length);
720 MD5Update(&ctx, confounder, confounder_len);
721 MD5Final(confounded_session_key.data, &ctx);
723 arcfour_crypt_blob(buffer, 516, &confounded_session_key);
725 memcpy(&my_pwd_buf->data[0], confounder, confounder_len);
726 memcpy(&my_pwd_buf->data[8], buffer, 516);
728 data_blob_free(&confounded_session_key);
730 *pwd_buf = my_pwd_buf;
733 WERROR decode_wkssvc_join_password_buffer(TALLOC_CTX *mem_ctx,
734 struct wkssvc_PasswordBuffer *pwd_buf,
735 DATA_BLOB *session_key,
736 char **pwd)
738 uint8_t buffer[516];
739 struct MD5Context ctx;
740 size_t pwd_len;
742 DATA_BLOB confounded_session_key;
744 int confounder_len = 8;
745 uint8_t confounder[8];
747 *pwd = NULL;
749 if (!pwd_buf) {
750 return WERR_BAD_PASSWORD;
753 if (session_key->length != 16) {
754 DEBUG(10,("invalid session key\n"));
755 return WERR_BAD_PASSWORD;
758 confounded_session_key = data_blob_talloc(mem_ctx, NULL, 16);
760 memcpy(&confounder, &pwd_buf->data[0], confounder_len);
761 memcpy(&buffer, &pwd_buf->data[8], 516);
763 MD5Init(&ctx);
764 MD5Update(&ctx, session_key->data, session_key->length);
765 MD5Update(&ctx, confounder, confounder_len);
766 MD5Final(confounded_session_key.data, &ctx);
768 arcfour_crypt_blob(buffer, 516, &confounded_session_key);
770 if (!decode_pw_buffer(mem_ctx, buffer, pwd, &pwd_len, CH_UTF16)) {
771 data_blob_free(&confounded_session_key);
772 return WERR_BAD_PASSWORD;
775 data_blob_free(&confounded_session_key);
777 return WERR_OK;