1 // SPDX-License-Identifier: LGPL-2.1
2 /*
3  *
4  *   Encryption and hashing operations relating to NTLM, NTLMv2.  See MS-NLMP
5  *   for more detailed information
6  *
7  *   Copyright (C) International Business Machines  Corp., 2005,2013
8  *   Author(s): Steve French (sfrench@us.ibm.com)
9  *
10  */
11 
12 #include <linux/fs.h>
13 #include <linux/slab.h>
14 #include "cifspdu.h"
15 #include "cifsglob.h"
16 #include "cifs_debug.h"
17 #include "cifs_unicode.h"
18 #include "cifsproto.h"
19 #include "ntlmssp.h"
20 #include <linux/ctype.h>
21 #include <linux/random.h>
22 #include <linux/highmem.h>
23 #include <linux/fips.h>
24 #include "../smbfs_common/arc4.h"
25 #include <crypto/aead.h>
26 
__cifs_calc_signature(struct smb_rqst * rqst,struct TCP_Server_Info * server,char * signature,struct shash_desc * shash)27 int __cifs_calc_signature(struct smb_rqst *rqst,
28 			struct TCP_Server_Info *server, char *signature,
29 			struct shash_desc *shash)
30 {
31 	int i;
32 	int rc;
33 	struct kvec *iov = rqst->rq_iov;
34 	int n_vec = rqst->rq_nvec;
35 
36 	/* iov[0] is actual data and not the rfc1002 length for SMB2+ */
37 	if (!is_smb1(server)) {
38 		if (iov[0].iov_len <= 4)
39 			return -EIO;
40 		i = 0;
41 	} else {
42 		if (n_vec < 2 || iov[0].iov_len != 4)
43 			return -EIO;
44 		i = 1; /* skip rfc1002 length */
45 	}
46 
47 	for (; i < n_vec; i++) {
48 		if (iov[i].iov_len == 0)
49 			continue;
50 		if (iov[i].iov_base == NULL) {
51 			cifs_dbg(VFS, "null iovec entry\n");
52 			return -EIO;
53 		}
54 
55 		rc = crypto_shash_update(shash,
56 					 iov[i].iov_base, iov[i].iov_len);
57 		if (rc) {
58 			cifs_dbg(VFS, "%s: Could not update with payload\n",
59 				 __func__);
60 			return rc;
61 		}
62 	}
63 
64 	/* now hash over the rq_pages array */
65 	for (i = 0; i < rqst->rq_npages; i++) {
66 		void *kaddr;
67 		unsigned int len, offset;
68 
69 		rqst_page_get_length(rqst, i, &len, &offset);
70 
71 		kaddr = (char *) kmap(rqst->rq_pages[i]) + offset;
72 
73 		rc = crypto_shash_update(shash, kaddr, len);
74 		if (rc) {
75 			cifs_dbg(VFS, "%s: Could not update with payload\n",
76 				 __func__);
77 			kunmap(rqst->rq_pages[i]);
78 			return rc;
79 		}
80 
81 		kunmap(rqst->rq_pages[i]);
82 	}
83 
84 	rc = crypto_shash_final(shash, signature);
85 	if (rc)
86 		cifs_dbg(VFS, "%s: Could not generate hash\n", __func__);
87 
88 	return rc;
89 }
90 
91 /*
92  * Calculate and return the CIFS signature based on the mac key and SMB PDU.
93  * The 16 byte signature must be allocated by the caller. Note we only use the
94  * 1st eight bytes and that the smb header signature field on input contains
95  * the sequence number before this function is called. Also, this function
96  * should be called with the server->srv_mutex held.
97  */
cifs_calc_signature(struct smb_rqst * rqst,struct TCP_Server_Info * server,char * signature)98 static int cifs_calc_signature(struct smb_rqst *rqst,
99 			struct TCP_Server_Info *server, char *signature)
100 {
101 	int rc;
102 
103 	if (!rqst->rq_iov || !signature || !server)
104 		return -EINVAL;
105 
106 	rc = cifs_alloc_hash("md5", &server->secmech.md5);
107 	if (rc)
108 		return -1;
109 
110 	rc = crypto_shash_init(server->secmech.md5);
111 	if (rc) {
112 		cifs_dbg(VFS, "%s: Could not init md5\n", __func__);
113 		return rc;
114 	}
115 
116 	rc = crypto_shash_update(server->secmech.md5,
117 		server->session_key.response, server->session_key.len);
118 	if (rc) {
119 		cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
120 		return rc;
121 	}
122 
123 	return __cifs_calc_signature(rqst, server, signature, server->secmech.md5);
124 }
125 
126 /* must be called with server->srv_mutex held */
cifs_sign_rqst(struct smb_rqst * rqst,struct TCP_Server_Info * server,__u32 * pexpected_response_sequence_number)127 int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server,
128 		   __u32 *pexpected_response_sequence_number)
129 {
130 	int rc = 0;
131 	char smb_signature[20];
132 	struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
133 
134 	if (rqst->rq_iov[0].iov_len != 4 ||
135 	    rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
136 		return -EIO;
137 
138 	if ((cifs_pdu == NULL) || (server == NULL))
139 		return -EINVAL;
140 
141 	spin_lock(&server->srv_lock);
142 	if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
143 	    server->tcpStatus == CifsNeedNegotiate) {
144 		spin_unlock(&server->srv_lock);
145 		return rc;
146 	}
147 	spin_unlock(&server->srv_lock);
148 
149 	if (!server->session_estab) {
150 		memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
151 		return rc;
152 	}
153 
154 	cifs_pdu->Signature.Sequence.SequenceNumber =
155 				cpu_to_le32(server->sequence_number);
156 	cifs_pdu->Signature.Sequence.Reserved = 0;
157 
158 	*pexpected_response_sequence_number = ++server->sequence_number;
159 	++server->sequence_number;
160 
161 	rc = cifs_calc_signature(rqst, server, smb_signature);
162 	if (rc)
163 		memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
164 	else
165 		memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
166 
167 	return rc;
168 }
169 
cifs_sign_smbv(struct kvec * iov,int n_vec,struct TCP_Server_Info * server,__u32 * pexpected_response_sequence)170 int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
171 		   __u32 *pexpected_response_sequence)
172 {
173 	struct smb_rqst rqst = { .rq_iov = iov,
174 				 .rq_nvec = n_vec };
175 
176 	return cifs_sign_rqst(&rqst, server, pexpected_response_sequence);
177 }
178 
179 /* must be called with server->srv_mutex held */
cifs_sign_smb(struct smb_hdr * cifs_pdu,struct TCP_Server_Info * server,__u32 * pexpected_response_sequence_number)180 int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
181 		  __u32 *pexpected_response_sequence_number)
182 {
183 	struct kvec iov[2];
184 
185 	iov[0].iov_base = cifs_pdu;
186 	iov[0].iov_len = 4;
187 	iov[1].iov_base = (char *)cifs_pdu + 4;
188 	iov[1].iov_len = be32_to_cpu(cifs_pdu->smb_buf_length);
189 
190 	return cifs_sign_smbv(iov, 2, server,
191 			      pexpected_response_sequence_number);
192 }
193 
cifs_verify_signature(struct smb_rqst * rqst,struct TCP_Server_Info * server,__u32 expected_sequence_number)194 int cifs_verify_signature(struct smb_rqst *rqst,
195 			  struct TCP_Server_Info *server,
196 			  __u32 expected_sequence_number)
197 {
198 	unsigned int rc;
199 	char server_response_sig[8];
200 	char what_we_think_sig_should_be[20];
201 	struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
202 
203 	if (rqst->rq_iov[0].iov_len != 4 ||
204 	    rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
205 		return -EIO;
206 
207 	if (cifs_pdu == NULL || server == NULL)
208 		return -EINVAL;
209 
210 	if (!server->session_estab)
211 		return 0;
212 
213 	if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
214 		struct smb_com_lock_req *pSMB =
215 			(struct smb_com_lock_req *)cifs_pdu;
216 		if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
217 			return 0;
218 	}
219 
220 	/* BB what if signatures are supposed to be on for session but
221 	   server does not send one? BB */
222 
223 	/* Do not need to verify session setups with signature "BSRSPYL "  */
224 	if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
225 		cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
226 			 cifs_pdu->Command);
227 
228 	/* save off the origiginal signature so we can modify the smb and check
229 		its signature against what the server sent */
230 	memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
231 
232 	cifs_pdu->Signature.Sequence.SequenceNumber =
233 					cpu_to_le32(expected_sequence_number);
234 	cifs_pdu->Signature.Sequence.Reserved = 0;
235 
236 	cifs_server_lock(server);
237 	rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);
238 	cifs_server_unlock(server);
239 
240 	if (rc)
241 		return rc;
242 
243 /*	cifs_dump_mem("what we think it should be: ",
244 		      what_we_think_sig_should_be, 16); */
245 
246 	if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
247 		return -EACCES;
248 	else
249 		return 0;
250 
251 }
252 
253 /* Build a proper attribute value/target info pairs blob.
254  * Fill in netbios and dns domain name and workstation name
255  * and client time (total five av pairs and + one end of fields indicator.
256  * Allocate domain name which gets freed when session struct is deallocated.
257  */
258 static int
build_avpair_blob(struct cifs_ses * ses,const struct nls_table * nls_cp)259 build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
260 {
261 	unsigned int dlen;
262 	unsigned int size = 2 * sizeof(struct ntlmssp2_name);
263 	char *defdmname = "WORKGROUP";
264 	unsigned char *blobptr;
265 	struct ntlmssp2_name *attrptr;
266 
267 	if (!ses->domainName) {
268 		ses->domainName = kstrdup(defdmname, GFP_KERNEL);
269 		if (!ses->domainName)
270 			return -ENOMEM;
271 	}
272 
273 	dlen = strlen(ses->domainName);
274 
275 	/*
276 	 * The length of this blob is two times the size of a
277 	 * structure (av pair) which holds name/size
278 	 * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
279 	 * unicode length of a netbios domain name
280 	 */
281 	ses->auth_key.len = size + 2 * dlen;
282 	ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
283 	if (!ses->auth_key.response) {
284 		ses->auth_key.len = 0;
285 		return -ENOMEM;
286 	}
287 
288 	blobptr = ses->auth_key.response;
289 	attrptr = (struct ntlmssp2_name *) blobptr;
290 
291 	/*
292 	 * As defined in MS-NTLM 3.3.2, just this av pair field
293 	 * is sufficient as part of the temp
294 	 */
295 	attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
296 	attrptr->length = cpu_to_le16(2 * dlen);
297 	blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
298 	cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
299 
300 	return 0;
301 }
302 
303 /* Server has provided av pairs/target info in the type 2 challenge
304  * packet and we have plucked it and stored within smb session.
305  * We parse that blob here to find netbios domain name to be used
306  * as part of ntlmv2 authentication (in Target String), if not already
307  * specified on the command line.
308  * If this function returns without any error but without fetching
309  * domain name, authentication may fail against some server but
310  * may not fail against other (those who are not very particular
311  * about target string i.e. for some, just user name might suffice.
312  */
313 static int
find_domain_name(struct cifs_ses * ses,const struct nls_table * nls_cp)314 find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
315 {
316 	unsigned int attrsize;
317 	unsigned int type;
318 	unsigned int onesize = sizeof(struct ntlmssp2_name);
319 	unsigned char *blobptr;
320 	unsigned char *blobend;
321 	struct ntlmssp2_name *attrptr;
322 
323 	if (!ses->auth_key.len || !ses->auth_key.response)
324 		return 0;
325 
326 	blobptr = ses->auth_key.response;
327 	blobend = blobptr + ses->auth_key.len;
328 
329 	while (blobptr + onesize < blobend) {
330 		attrptr = (struct ntlmssp2_name *) blobptr;
331 		type = le16_to_cpu(attrptr->type);
332 		if (type == NTLMSSP_AV_EOL)
333 			break;
334 		blobptr += 2; /* advance attr type */
335 		attrsize = le16_to_cpu(attrptr->length);
336 		blobptr += 2; /* advance attr size */
337 		if (blobptr + attrsize > blobend)
338 			break;
339 		if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
340 			if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN)
341 				break;
342 			if (!ses->domainName) {
343 				ses->domainName =
344 					kmalloc(attrsize + 1, GFP_KERNEL);
345 				if (!ses->domainName)
346 						return -ENOMEM;
347 				cifs_from_utf16(ses->domainName,
348 					(__le16 *)blobptr, attrsize, attrsize,
349 					nls_cp, NO_MAP_UNI_RSVD);
350 				break;
351 			}
352 		}
353 		blobptr += attrsize; /* advance attr  value */
354 	}
355 
356 	return 0;
357 }
358 
359 /* Server has provided av pairs/target info in the type 2 challenge
360  * packet and we have plucked it and stored within smb session.
361  * We parse that blob here to find the server given timestamp
362  * as part of ntlmv2 authentication (or local current time as
363  * default in case of failure)
364  */
365 static __le64
find_timestamp(struct cifs_ses * ses)366 find_timestamp(struct cifs_ses *ses)
367 {
368 	unsigned int attrsize;
369 	unsigned int type;
370 	unsigned int onesize = sizeof(struct ntlmssp2_name);
371 	unsigned char *blobptr;
372 	unsigned char *blobend;
373 	struct ntlmssp2_name *attrptr;
374 	struct timespec64 ts;
375 
376 	if (!ses->auth_key.len || !ses->auth_key.response)
377 		return 0;
378 
379 	blobptr = ses->auth_key.response;
380 	blobend = blobptr + ses->auth_key.len;
381 
382 	while (blobptr + onesize < blobend) {
383 		attrptr = (struct ntlmssp2_name *) blobptr;
384 		type = le16_to_cpu(attrptr->type);
385 		if (type == NTLMSSP_AV_EOL)
386 			break;
387 		blobptr += 2; /* advance attr type */
388 		attrsize = le16_to_cpu(attrptr->length);
389 		blobptr += 2; /* advance attr size */
390 		if (blobptr + attrsize > blobend)
391 			break;
392 		if (type == NTLMSSP_AV_TIMESTAMP) {
393 			if (attrsize == sizeof(u64))
394 				return *((__le64 *)blobptr);
395 		}
396 		blobptr += attrsize; /* advance attr value */
397 	}
398 
399 	ktime_get_real_ts64(&ts);
400 	return cpu_to_le64(cifs_UnixTimeToNT(ts));
401 }
402 
calc_ntlmv2_hash(struct cifs_ses * ses,char * ntlmv2_hash,const struct nls_table * nls_cp)403 static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
404 			    const struct nls_table *nls_cp)
405 {
406 	int rc = 0;
407 	int len;
408 	char nt_hash[CIFS_NTHASH_SIZE];
409 	__le16 *user;
410 	wchar_t *domain;
411 	wchar_t *server;
412 
413 	if (!ses->server->secmech.hmacmd5) {
414 		cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
415 		return -1;
416 	}
417 
418 	/* calculate md4 hash of password */
419 	E_md4hash(ses->password, nt_hash, nls_cp);
420 
421 	rc = crypto_shash_setkey(ses->server->secmech.hmacmd5->tfm, nt_hash,
422 				CIFS_NTHASH_SIZE);
423 	if (rc) {
424 		cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__);
425 		return rc;
426 	}
427 
428 	rc = crypto_shash_init(ses->server->secmech.hmacmd5);
429 	if (rc) {
430 		cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
431 		return rc;
432 	}
433 
434 	/* convert ses->user_name to unicode */
435 	len = ses->user_name ? strlen(ses->user_name) : 0;
436 	user = kmalloc(2 + (len * 2), GFP_KERNEL);
437 	if (user == NULL) {
438 		rc = -ENOMEM;
439 		return rc;
440 	}
441 
442 	if (len) {
443 		len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);
444 		UniStrupr(user);
445 	} else {
446 		memset(user, '\0', 2);
447 	}
448 
449 	rc = crypto_shash_update(ses->server->secmech.hmacmd5,
450 				(char *)user, 2 * len);
451 	kfree(user);
452 	if (rc) {
453 		cifs_dbg(VFS, "%s: Could not update with user\n", __func__);
454 		return rc;
455 	}
456 
457 	/* convert ses->domainName to unicode and uppercase */
458 	if (ses->domainName) {
459 		len = strlen(ses->domainName);
460 
461 		domain = kmalloc(2 + (len * 2), GFP_KERNEL);
462 		if (domain == NULL) {
463 			rc = -ENOMEM;
464 			return rc;
465 		}
466 		len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
467 				      nls_cp);
468 		rc =
469 		crypto_shash_update(ses->server->secmech.hmacmd5,
470 					(char *)domain, 2 * len);
471 		kfree(domain);
472 		if (rc) {
473 			cifs_dbg(VFS, "%s: Could not update with domain\n",
474 				 __func__);
475 			return rc;
476 		}
477 	} else {
478 		/* We use ses->ip_addr if no domain name available */
479 		len = strlen(ses->ip_addr);
480 
481 		server = kmalloc(2 + (len * 2), GFP_KERNEL);
482 		if (server == NULL) {
483 			rc = -ENOMEM;
484 			return rc;
485 		}
486 		len = cifs_strtoUTF16((__le16 *)server, ses->ip_addr, len,
487 					nls_cp);
488 		rc =
489 		crypto_shash_update(ses->server->secmech.hmacmd5,
490 					(char *)server, 2 * len);
491 		kfree(server);
492 		if (rc) {
493 			cifs_dbg(VFS, "%s: Could not update with server\n",
494 				 __func__);
495 			return rc;
496 		}
497 	}
498 
499 	rc = crypto_shash_final(ses->server->secmech.hmacmd5,
500 					ntlmv2_hash);
501 	if (rc)
502 		cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
503 
504 	return rc;
505 }
506 
507 static int
CalcNTLMv2_response(const struct cifs_ses * ses,char * ntlmv2_hash)508 CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
509 {
510 	int rc;
511 	struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *)
512 	    (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
513 	unsigned int hash_len;
514 
515 	/* The MD5 hash starts at challenge_key.key */
516 	hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE +
517 		offsetof(struct ntlmv2_resp, challenge.key[0]));
518 
519 	if (!ses->server->secmech.hmacmd5) {
520 		cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
521 		return -1;
522 	}
523 
524 	rc = crypto_shash_setkey(ses->server->secmech.hmacmd5->tfm,
525 				 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
526 	if (rc) {
527 		cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
528 			 __func__);
529 		return rc;
530 	}
531 
532 	rc = crypto_shash_init(ses->server->secmech.hmacmd5);
533 	if (rc) {
534 		cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
535 		return rc;
536 	}
537 
538 	if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)
539 		memcpy(ntlmv2->challenge.key,
540 		       ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
541 	else
542 		memcpy(ntlmv2->challenge.key,
543 		       ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
544 	rc = crypto_shash_update(ses->server->secmech.hmacmd5,
545 				 ntlmv2->challenge.key, hash_len);
546 	if (rc) {
547 		cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
548 		return rc;
549 	}
550 
551 	/* Note that the MD5 digest over writes anon.challenge_key.key */
552 	rc = crypto_shash_final(ses->server->secmech.hmacmd5,
553 				ntlmv2->ntlmv2_hash);
554 	if (rc)
555 		cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
556 
557 	return rc;
558 }
559 
560 int
setup_ntlmv2_rsp(struct cifs_ses * ses,const struct nls_table * nls_cp)561 setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
562 {
563 	int rc;
564 	int baselen;
565 	unsigned int tilen;
566 	struct ntlmv2_resp *ntlmv2;
567 	char ntlmv2_hash[16];
568 	unsigned char *tiblob = NULL; /* target info blob */
569 	__le64 rsp_timestamp;
570 
571 	if (nls_cp == NULL) {
572 		cifs_dbg(VFS, "%s called with nls_cp==NULL\n", __func__);
573 		return -EINVAL;
574 	}
575 
576 	if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) {
577 		if (!ses->domainName) {
578 			if (ses->domainAuto) {
579 				rc = find_domain_name(ses, nls_cp);
580 				if (rc) {
581 					cifs_dbg(VFS, "error %d finding domain name\n",
582 						 rc);
583 					goto setup_ntlmv2_rsp_ret;
584 				}
585 			} else {
586 				ses->domainName = kstrdup("", GFP_KERNEL);
587 			}
588 		}
589 	} else {
590 		rc = build_avpair_blob(ses, nls_cp);
591 		if (rc) {
592 			cifs_dbg(VFS, "error %d building av pair blob\n", rc);
593 			goto setup_ntlmv2_rsp_ret;
594 		}
595 	}
596 
597 	/* Must be within 5 minutes of the server (or in range +/-2h
598 	 * in case of Mac OS X), so simply carry over server timestamp
599 	 * (as Windows 7 does)
600 	 */
601 	rsp_timestamp = find_timestamp(ses);
602 
603 	baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
604 	tilen = ses->auth_key.len;
605 	tiblob = ses->auth_key.response;
606 
607 	ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
608 	if (!ses->auth_key.response) {
609 		rc = -ENOMEM;
610 		ses->auth_key.len = 0;
611 		goto setup_ntlmv2_rsp_ret;
612 	}
613 	ses->auth_key.len += baselen;
614 
615 	ntlmv2 = (struct ntlmv2_resp *)
616 			(ses->auth_key.response + CIFS_SESS_KEY_SIZE);
617 	ntlmv2->blob_signature = cpu_to_le32(0x00000101);
618 	ntlmv2->reserved = 0;
619 	ntlmv2->time = rsp_timestamp;
620 
621 	get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal));
622 	ntlmv2->reserved2 = 0;
623 
624 	memcpy(ses->auth_key.response + baselen, tiblob, tilen);
625 
626 	cifs_server_lock(ses->server);
627 
628 	rc = cifs_alloc_hash("hmac(md5)", &ses->server->secmech.hmacmd5);
629 	if (rc) {
630 		goto unlock;
631 	}
632 
633 	/* calculate ntlmv2_hash */
634 	rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
635 	if (rc) {
636 		cifs_dbg(VFS, "Could not get v2 hash rc %d\n", rc);
637 		goto unlock;
638 	}
639 
640 	/* calculate first part of the client response (CR1) */
641 	rc = CalcNTLMv2_response(ses, ntlmv2_hash);
642 	if (rc) {
643 		cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc);
644 		goto unlock;
645 	}
646 
647 	/* now calculate the session key for NTLMv2 */
648 	rc = crypto_shash_setkey(ses->server->secmech.hmacmd5->tfm,
649 		ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
650 	if (rc) {
651 		cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
652 			 __func__);
653 		goto unlock;
654 	}
655 
656 	rc = crypto_shash_init(ses->server->secmech.hmacmd5);
657 	if (rc) {
658 		cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
659 		goto unlock;
660 	}
661 
662 	rc = crypto_shash_update(ses->server->secmech.hmacmd5,
663 		ntlmv2->ntlmv2_hash,
664 		CIFS_HMAC_MD5_HASH_SIZE);
665 	if (rc) {
666 		cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
667 		goto unlock;
668 	}
669 
670 	rc = crypto_shash_final(ses->server->secmech.hmacmd5,
671 		ses->auth_key.response);
672 	if (rc)
673 		cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
674 
675 unlock:
676 	cifs_server_unlock(ses->server);
677 setup_ntlmv2_rsp_ret:
678 	kfree_sensitive(tiblob);
679 
680 	return rc;
681 }
682 
683 int
calc_seckey(struct cifs_ses * ses)684 calc_seckey(struct cifs_ses *ses)
685 {
686 	unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
687 	struct arc4_ctx *ctx_arc4;
688 
689 	if (fips_enabled)
690 		return -ENODEV;
691 
692 	get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
693 
694 	ctx_arc4 = kmalloc(sizeof(*ctx_arc4), GFP_KERNEL);
695 	if (!ctx_arc4) {
696 		cifs_dbg(VFS, "Could not allocate arc4 context\n");
697 		return -ENOMEM;
698 	}
699 
700 	cifs_arc4_setkey(ctx_arc4, ses->auth_key.response, CIFS_SESS_KEY_SIZE);
701 	cifs_arc4_crypt(ctx_arc4, ses->ntlmssp->ciphertext, sec_key,
702 			CIFS_CPHTXT_SIZE);
703 
704 	/* make secondary_key/nonce as session key */
705 	memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
706 	/* and make len as that of session key only */
707 	ses->auth_key.len = CIFS_SESS_KEY_SIZE;
708 
709 	memzero_explicit(sec_key, CIFS_SESS_KEY_SIZE);
710 	kfree_sensitive(ctx_arc4);
711 	return 0;
712 }
713 
714 void
cifs_crypto_secmech_release(struct TCP_Server_Info * server)715 cifs_crypto_secmech_release(struct TCP_Server_Info *server)
716 {
717 	cifs_free_hash(&server->secmech.aes_cmac);
718 	cifs_free_hash(&server->secmech.hmacsha256);
719 	cifs_free_hash(&server->secmech.md5);
720 	cifs_free_hash(&server->secmech.sha512);
721 	cifs_free_hash(&server->secmech.hmacmd5);
722 
723 	if (server->secmech.enc) {
724 		crypto_free_aead(server->secmech.enc);
725 		server->secmech.enc = NULL;
726 	}
727 
728 	if (server->secmech.dec) {
729 		crypto_free_aead(server->secmech.dec);
730 		server->secmech.dec = NULL;
731 	}
732 }
733