1 // SPDX-License-Identifier: LGPL-2.1
3 * fs/cifs/cifsencrypt.c
5 * Encryption and hashing operations relating to NTLM, NTLMv2. See MS-NLMP
6 * for more detailed information
8 * Copyright (C) International Business Machines Corp., 2005,2013
9 * Author(s): Steve French (sfrench@us.ibm.com)
14 #include <linux/slab.h>
17 #include "cifs_debug.h"
18 #include "cifs_unicode.h"
19 #include "cifsproto.h"
21 #include <linux/ctype.h>
22 #include <linux/random.h>
23 #include <linux/highmem.h>
24 #include <linux/fips.h>
25 #include <crypto/arc4.h>
26 #include <crypto/aead.h>
28 int __cifs_calc_signature(struct smb_rqst *rqst,
29 struct TCP_Server_Info *server, char *signature,
30 struct shash_desc *shash)
34 struct kvec *iov = rqst->rq_iov;
35 int n_vec = rqst->rq_nvec;
36 int is_smb2 = server->vals->header_preamble_size == 0;
38 /* iov[0] is actual data and not the rfc1002 length for SMB2+ */
40 if (iov[0].iov_len <= 4)
44 if (n_vec < 2 || iov[0].iov_len != 4)
46 i = 1; /* skip rfc1002 length */
49 for (; i < n_vec; i++) {
50 if (iov[i].iov_len == 0)
52 if (iov[i].iov_base == NULL) {
53 cifs_dbg(VFS, "null iovec entry\n");
57 rc = crypto_shash_update(shash,
58 iov[i].iov_base, iov[i].iov_len);
60 cifs_dbg(VFS, "%s: Could not update with payload\n",
66 /* now hash over the rq_pages array */
67 for (i = 0; i < rqst->rq_npages; i++) {
69 unsigned int len, offset;
71 rqst_page_get_length(rqst, i, &len, &offset);
73 kaddr = (char *) kmap(rqst->rq_pages[i]) + offset;
75 rc = crypto_shash_update(shash, kaddr, len);
77 cifs_dbg(VFS, "%s: Could not update with payload\n",
79 kunmap(rqst->rq_pages[i]);
83 kunmap(rqst->rq_pages[i]);
86 rc = crypto_shash_final(shash, signature);
88 cifs_dbg(VFS, "%s: Could not generate hash\n", __func__);
94 * Calculate and return the CIFS signature based on the mac key and SMB PDU.
95 * The 16 byte signature must be allocated by the caller. Note we only use the
96 * 1st eight bytes and that the smb header signature field on input contains
97 * the sequence number before this function is called. Also, this function
98 * should be called with the server->srv_mutex held.
100 static int cifs_calc_signature(struct smb_rqst *rqst,
101 struct TCP_Server_Info *server, char *signature)
105 if (!rqst->rq_iov || !signature || !server)
108 rc = cifs_alloc_hash("md5", &server->secmech.md5,
109 &server->secmech.sdescmd5);
113 rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
115 cifs_dbg(VFS, "%s: Could not init md5\n", __func__);
119 rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
120 server->session_key.response, server->session_key.len);
122 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
126 return __cifs_calc_signature(rqst, server, signature,
127 &server->secmech.sdescmd5->shash);
130 /* must be called with server->srv_mutex held */
131 int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server,
132 __u32 *pexpected_response_sequence_number)
135 char smb_signature[20];
136 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
138 if (rqst->rq_iov[0].iov_len != 4 ||
139 rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
142 if ((cifs_pdu == NULL) || (server == NULL))
145 if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
146 server->tcpStatus == CifsNeedNegotiate)
149 if (!server->session_estab) {
150 memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
154 cifs_pdu->Signature.Sequence.SequenceNumber =
155 cpu_to_le32(server->sequence_number);
156 cifs_pdu->Signature.Sequence.Reserved = 0;
158 *pexpected_response_sequence_number = ++server->sequence_number;
159 ++server->sequence_number;
161 rc = cifs_calc_signature(rqst, server, smb_signature);
163 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
165 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
170 int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
171 __u32 *pexpected_response_sequence)
173 struct smb_rqst rqst = { .rq_iov = iov,
176 return cifs_sign_rqst(&rqst, server, pexpected_response_sequence);
179 /* must be called with server->srv_mutex held */
180 int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
181 __u32 *pexpected_response_sequence_number)
185 iov[0].iov_base = cifs_pdu;
187 iov[1].iov_base = (char *)cifs_pdu + 4;
188 iov[1].iov_len = be32_to_cpu(cifs_pdu->smb_buf_length);
190 return cifs_sign_smbv(iov, 2, server,
191 pexpected_response_sequence_number);
194 int cifs_verify_signature(struct smb_rqst *rqst,
195 struct TCP_Server_Info *server,
196 __u32 expected_sequence_number)
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;
203 if (rqst->rq_iov[0].iov_len != 4 ||
204 rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
207 if (cifs_pdu == NULL || server == NULL)
210 if (!server->session_estab)
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)
220 /* BB what if signatures are supposed to be on for session but
221 server does not send one? BB */
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",
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);
232 cifs_pdu->Signature.Sequence.SequenceNumber =
233 cpu_to_le32(expected_sequence_number);
234 cifs_pdu->Signature.Sequence.Reserved = 0;
236 mutex_lock(&server->srv_mutex);
237 rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);
238 mutex_unlock(&server->srv_mutex);
243 /* cifs_dump_mem("what we think it should be: ",
244 what_we_think_sig_should_be, 16); */
246 if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
253 /* first calculate 24 bytes ntlm response and then 16 byte session key */
254 int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp)
257 unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
258 char temp_key[CIFS_SESS_KEY_SIZE];
263 ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
264 if (!ses->auth_key.response)
267 ses->auth_key.len = temp_len;
269 rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
270 ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp);
272 cifs_dbg(FYI, "%s Can't generate NTLM response, error: %d\n",
277 rc = E_md4hash(ses->password, temp_key, nls_cp);
279 cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n",
284 rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
286 cifs_dbg(FYI, "%s Can't generate NTLM session key, error: %d\n",
292 #ifdef CONFIG_CIFS_WEAK_PW_HASH
293 int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
294 char *lnm_session_key)
298 char password_with_pad[CIFS_ENCPWD_SIZE] = {0};
301 for (len = 0; len < CIFS_ENCPWD_SIZE; len++)
305 memcpy(password_with_pad, password, len);
308 if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
309 memcpy(lnm_session_key, password_with_pad,
314 /* calculate old style session key */
315 /* calling toupper is less broken than repeatedly
316 calling nls_toupper would be since that will never
317 work for UTF8, but neither handles multibyte code pages
318 but the only alternative would be converting to UCS-16 (Unicode)
319 (using a routine something like UniStrupr) then
320 uppercasing and then converting back from Unicode - which
321 would only worth doing it if we knew it were utf8. Basically
322 utf8 and other multibyte codepages each need their own strupper
323 function since a byte at a time will ont work. */
325 for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
326 password_with_pad[i] = toupper(password_with_pad[i]);
328 rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
332 #endif /* CIFS_WEAK_PW_HASH */
334 /* Build a proper attribute value/target info pairs blob.
335 * Fill in netbios and dns domain name and workstation name
336 * and client time (total five av pairs and + one end of fields indicator.
337 * Allocate domain name which gets freed when session struct is deallocated.
340 build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
343 unsigned int size = 2 * sizeof(struct ntlmssp2_name);
344 char *defdmname = "WORKGROUP";
345 unsigned char *blobptr;
346 struct ntlmssp2_name *attrptr;
348 if (!ses->domainName) {
349 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
350 if (!ses->domainName)
354 dlen = strlen(ses->domainName);
357 * The length of this blob is two times the size of a
358 * structure (av pair) which holds name/size
359 * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
360 * unicode length of a netbios domain name
362 ses->auth_key.len = size + 2 * dlen;
363 ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
364 if (!ses->auth_key.response) {
365 ses->auth_key.len = 0;
369 blobptr = ses->auth_key.response;
370 attrptr = (struct ntlmssp2_name *) blobptr;
373 * As defined in MS-NTLM 3.3.2, just this av pair field
374 * is sufficient as part of the temp
376 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
377 attrptr->length = cpu_to_le16(2 * dlen);
378 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
379 cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
384 /* Server has provided av pairs/target info in the type 2 challenge
385 * packet and we have plucked it and stored within smb session.
386 * We parse that blob here to find netbios domain name to be used
387 * as part of ntlmv2 authentication (in Target String), if not already
388 * specified on the command line.
389 * If this function returns without any error but without fetching
390 * domain name, authentication may fail against some server but
391 * may not fail against other (those who are not very particular
392 * about target string i.e. for some, just user name might suffice.
395 find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
397 unsigned int attrsize;
399 unsigned int onesize = sizeof(struct ntlmssp2_name);
400 unsigned char *blobptr;
401 unsigned char *blobend;
402 struct ntlmssp2_name *attrptr;
404 if (!ses->auth_key.len || !ses->auth_key.response)
407 blobptr = ses->auth_key.response;
408 blobend = blobptr + ses->auth_key.len;
410 while (blobptr + onesize < blobend) {
411 attrptr = (struct ntlmssp2_name *) blobptr;
412 type = le16_to_cpu(attrptr->type);
413 if (type == NTLMSSP_AV_EOL)
415 blobptr += 2; /* advance attr type */
416 attrsize = le16_to_cpu(attrptr->length);
417 blobptr += 2; /* advance attr size */
418 if (blobptr + attrsize > blobend)
420 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
421 if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN)
423 if (!ses->domainName) {
425 kmalloc(attrsize + 1, GFP_KERNEL);
426 if (!ses->domainName)
428 cifs_from_utf16(ses->domainName,
429 (__le16 *)blobptr, attrsize, attrsize,
430 nls_cp, NO_MAP_UNI_RSVD);
434 blobptr += attrsize; /* advance attr value */
440 /* Server has provided av pairs/target info in the type 2 challenge
441 * packet and we have plucked it and stored within smb session.
442 * We parse that blob here to find the server given timestamp
443 * as part of ntlmv2 authentication (or local current time as
444 * default in case of failure)
447 find_timestamp(struct cifs_ses *ses)
449 unsigned int attrsize;
451 unsigned int onesize = sizeof(struct ntlmssp2_name);
452 unsigned char *blobptr;
453 unsigned char *blobend;
454 struct ntlmssp2_name *attrptr;
455 struct timespec64 ts;
457 if (!ses->auth_key.len || !ses->auth_key.response)
460 blobptr = ses->auth_key.response;
461 blobend = blobptr + ses->auth_key.len;
463 while (blobptr + onesize < blobend) {
464 attrptr = (struct ntlmssp2_name *) blobptr;
465 type = le16_to_cpu(attrptr->type);
466 if (type == NTLMSSP_AV_EOL)
468 blobptr += 2; /* advance attr type */
469 attrsize = le16_to_cpu(attrptr->length);
470 blobptr += 2; /* advance attr size */
471 if (blobptr + attrsize > blobend)
473 if (type == NTLMSSP_AV_TIMESTAMP) {
474 if (attrsize == sizeof(u64))
475 return *((__le64 *)blobptr);
477 blobptr += attrsize; /* advance attr value */
480 ktime_get_real_ts64(&ts);
481 return cpu_to_le64(cifs_UnixTimeToNT(ts));
484 static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
485 const struct nls_table *nls_cp)
489 char nt_hash[CIFS_NTHASH_SIZE];
494 if (!ses->server->secmech.sdeschmacmd5) {
495 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
499 /* calculate md4 hash of password */
500 E_md4hash(ses->password, nt_hash, nls_cp);
502 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
505 cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__);
509 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
511 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
515 /* convert ses->user_name to unicode */
516 len = ses->user_name ? strlen(ses->user_name) : 0;
517 user = kmalloc(2 + (len * 2), GFP_KERNEL);
524 len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);
527 memset(user, '\0', 2);
530 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
531 (char *)user, 2 * len);
534 cifs_dbg(VFS, "%s: Could not update with user\n", __func__);
538 /* convert ses->domainName to unicode and uppercase */
539 if (ses->domainName) {
540 len = strlen(ses->domainName);
542 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
543 if (domain == NULL) {
547 len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
550 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
551 (char *)domain, 2 * len);
554 cifs_dbg(VFS, "%s: Could not update with domain\n",
559 /* We use ses->ip_addr if no domain name available */
560 len = strlen(ses->ip_addr);
562 server = kmalloc(2 + (len * 2), GFP_KERNEL);
563 if (server == NULL) {
567 len = cifs_strtoUTF16((__le16 *)server, ses->ip_addr, len,
570 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
571 (char *)server, 2 * len);
574 cifs_dbg(VFS, "%s: Could not update with server\n",
580 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
583 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
589 CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
592 struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *)
593 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
594 unsigned int hash_len;
596 /* The MD5 hash starts at challenge_key.key */
597 hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE +
598 offsetof(struct ntlmv2_resp, challenge.key[0]));
600 if (!ses->server->secmech.sdeschmacmd5) {
601 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
605 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
606 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
608 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
613 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
615 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
619 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)
620 memcpy(ntlmv2->challenge.key,
621 ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
623 memcpy(ntlmv2->challenge.key,
624 ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
625 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
626 ntlmv2->challenge.key, hash_len);
628 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
632 /* Note that the MD5 digest over writes anon.challenge_key.key */
633 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
634 ntlmv2->ntlmv2_hash);
636 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
642 setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
647 struct ntlmv2_resp *ntlmv2;
648 char ntlmv2_hash[16];
649 unsigned char *tiblob = NULL; /* target info blob */
650 __le64 rsp_timestamp;
652 if (nls_cp == NULL) {
653 cifs_dbg(VFS, "%s called with nls_cp==NULL\n", __func__);
657 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) {
658 if (!ses->domainName) {
659 if (ses->domainAuto) {
660 rc = find_domain_name(ses, nls_cp);
662 cifs_dbg(VFS, "error %d finding domain name\n",
664 goto setup_ntlmv2_rsp_ret;
667 ses->domainName = kstrdup("", GFP_KERNEL);
671 rc = build_avpair_blob(ses, nls_cp);
673 cifs_dbg(VFS, "error %d building av pair blob\n", rc);
674 goto setup_ntlmv2_rsp_ret;
678 /* Must be within 5 minutes of the server (or in range +/-2h
679 * in case of Mac OS X), so simply carry over server timestamp
680 * (as Windows 7 does)
682 rsp_timestamp = find_timestamp(ses);
684 baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
685 tilen = ses->auth_key.len;
686 tiblob = ses->auth_key.response;
688 ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
689 if (!ses->auth_key.response) {
691 ses->auth_key.len = 0;
692 goto setup_ntlmv2_rsp_ret;
694 ses->auth_key.len += baselen;
696 ntlmv2 = (struct ntlmv2_resp *)
697 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
698 ntlmv2->blob_signature = cpu_to_le32(0x00000101);
699 ntlmv2->reserved = 0;
700 ntlmv2->time = rsp_timestamp;
702 get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal));
703 ntlmv2->reserved2 = 0;
705 memcpy(ses->auth_key.response + baselen, tiblob, tilen);
707 mutex_lock(&ses->server->srv_mutex);
709 rc = cifs_alloc_hash("hmac(md5)",
710 &ses->server->secmech.hmacmd5,
711 &ses->server->secmech.sdeschmacmd5);
716 /* calculate ntlmv2_hash */
717 rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
719 cifs_dbg(VFS, "Could not get v2 hash rc %d\n", rc);
723 /* calculate first part of the client response (CR1) */
724 rc = CalcNTLMv2_response(ses, ntlmv2_hash);
726 cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc);
730 /* now calculate the session key for NTLMv2 */
731 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
732 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
734 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
739 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
741 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
745 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
747 CIFS_HMAC_MD5_HASH_SIZE);
749 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
753 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
754 ses->auth_key.response);
756 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
759 mutex_unlock(&ses->server->srv_mutex);
760 setup_ntlmv2_rsp_ret:
767 calc_seckey(struct cifs_ses *ses)
769 unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
770 struct arc4_ctx *ctx_arc4;
775 get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
777 ctx_arc4 = kmalloc(sizeof(*ctx_arc4), GFP_KERNEL);
779 cifs_dbg(VFS, "Could not allocate arc4 context\n");
783 arc4_setkey(ctx_arc4, ses->auth_key.response, CIFS_SESS_KEY_SIZE);
784 arc4_crypt(ctx_arc4, ses->ntlmssp->ciphertext, sec_key,
787 /* make secondary_key/nonce as session key */
788 memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
789 /* and make len as that of session key only */
790 ses->auth_key.len = CIFS_SESS_KEY_SIZE;
792 memzero_explicit(sec_key, CIFS_SESS_KEY_SIZE);
793 kfree_sensitive(ctx_arc4);
798 cifs_crypto_secmech_release(struct TCP_Server_Info *server)
800 if (server->secmech.cmacaes) {
801 crypto_free_shash(server->secmech.cmacaes);
802 server->secmech.cmacaes = NULL;
805 if (server->secmech.hmacsha256) {
806 crypto_free_shash(server->secmech.hmacsha256);
807 server->secmech.hmacsha256 = NULL;
810 if (server->secmech.md5) {
811 crypto_free_shash(server->secmech.md5);
812 server->secmech.md5 = NULL;
815 if (server->secmech.sha512) {
816 crypto_free_shash(server->secmech.sha512);
817 server->secmech.sha512 = NULL;
820 if (server->secmech.hmacmd5) {
821 crypto_free_shash(server->secmech.hmacmd5);
822 server->secmech.hmacmd5 = NULL;
825 if (server->secmech.ccmaesencrypt) {
826 crypto_free_aead(server->secmech.ccmaesencrypt);
827 server->secmech.ccmaesencrypt = NULL;
830 if (server->secmech.ccmaesdecrypt) {
831 crypto_free_aead(server->secmech.ccmaesdecrypt);
832 server->secmech.ccmaesdecrypt = NULL;
835 kfree(server->secmech.sdesccmacaes);
836 server->secmech.sdesccmacaes = NULL;
837 kfree(server->secmech.sdeschmacsha256);
838 server->secmech.sdeschmacsha256 = NULL;
839 kfree(server->secmech.sdeschmacmd5);
840 server->secmech.sdeschmacmd5 = NULL;
841 kfree(server->secmech.sdescmd5);
842 server->secmech.sdescmd5 = NULL;
843 kfree(server->secmech.sdescsha512);
844 server->secmech.sdescsha512 = NULL;