720 lines · c
1// SPDX-License-Identifier: LGPL-2.12/*3 *4 * Encryption and hashing operations relating to NTLM, NTLMv2. See MS-NLMP5 * for more detailed information6 *7 * Copyright (C) International Business Machines Corp., 2005,20138 * 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 <linux/iov_iter.h>25#include "../common/arc4.h"26#include <crypto/aead.h>27 28static size_t cifs_shash_step(void *iter_base, size_t progress, size_t len,29 void *priv, void *priv2)30{31 struct shash_desc *shash = priv;32 int ret, *pret = priv2;33 34 ret = crypto_shash_update(shash, iter_base, len);35 if (ret < 0) {36 *pret = ret;37 return len;38 }39 return 0;40}41 42/*43 * Pass the data from an iterator into a hash.44 */45static int cifs_shash_iter(const struct iov_iter *iter, size_t maxsize,46 struct shash_desc *shash)47{48 struct iov_iter tmp_iter = *iter;49 int err = -EIO;50 51 if (iterate_and_advance_kernel(&tmp_iter, maxsize, shash, &err,52 cifs_shash_step) != maxsize)53 return err;54 return 0;55}56 57int __cifs_calc_signature(struct smb_rqst *rqst,58 struct TCP_Server_Info *server, char *signature,59 struct shash_desc *shash)60{61 int i;62 ssize_t rc;63 struct kvec *iov = rqst->rq_iov;64 int n_vec = rqst->rq_nvec;65 66 /* iov[0] is actual data and not the rfc1002 length for SMB2+ */67 if (!is_smb1(server)) {68 if (iov[0].iov_len <= 4)69 return -EIO;70 i = 0;71 } else {72 if (n_vec < 2 || iov[0].iov_len != 4)73 return -EIO;74 i = 1; /* skip rfc1002 length */75 }76 77 for (; i < n_vec; i++) {78 if (iov[i].iov_len == 0)79 continue;80 if (iov[i].iov_base == NULL) {81 cifs_dbg(VFS, "null iovec entry\n");82 return -EIO;83 }84 85 rc = crypto_shash_update(shash,86 iov[i].iov_base, iov[i].iov_len);87 if (rc) {88 cifs_dbg(VFS, "%s: Could not update with payload\n",89 __func__);90 return rc;91 }92 }93 94 rc = cifs_shash_iter(&rqst->rq_iter, iov_iter_count(&rqst->rq_iter), shash);95 if (rc < 0)96 return rc;97 98 rc = crypto_shash_final(shash, signature);99 if (rc)100 cifs_dbg(VFS, "%s: Could not generate hash\n", __func__);101 102 return rc;103}104 105/*106 * Calculate and return the CIFS signature based on the mac key and SMB PDU.107 * The 16 byte signature must be allocated by the caller. Note we only use the108 * 1st eight bytes and that the smb header signature field on input contains109 * the sequence number before this function is called. Also, this function110 * should be called with the server->srv_mutex held.111 */112static int cifs_calc_signature(struct smb_rqst *rqst,113 struct TCP_Server_Info *server, char *signature)114{115 int rc;116 117 if (!rqst->rq_iov || !signature || !server)118 return -EINVAL;119 120 rc = cifs_alloc_hash("md5", &server->secmech.md5);121 if (rc)122 return -1;123 124 rc = crypto_shash_init(server->secmech.md5);125 if (rc) {126 cifs_dbg(VFS, "%s: Could not init md5\n", __func__);127 return rc;128 }129 130 rc = crypto_shash_update(server->secmech.md5,131 server->session_key.response, server->session_key.len);132 if (rc) {133 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);134 return rc;135 }136 137 return __cifs_calc_signature(rqst, server, signature, server->secmech.md5);138}139 140/* must be called with server->srv_mutex held */141int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server,142 __u32 *pexpected_response_sequence_number)143{144 int rc = 0;145 char smb_signature[20];146 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;147 148 if (rqst->rq_iov[0].iov_len != 4 ||149 rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)150 return -EIO;151 152 if ((cifs_pdu == NULL) || (server == NULL))153 return -EINVAL;154 155 spin_lock(&server->srv_lock);156 if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||157 server->tcpStatus == CifsNeedNegotiate) {158 spin_unlock(&server->srv_lock);159 return rc;160 }161 spin_unlock(&server->srv_lock);162 163 if (!server->session_estab) {164 memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);165 return rc;166 }167 168 cifs_pdu->Signature.Sequence.SequenceNumber =169 cpu_to_le32(server->sequence_number);170 cifs_pdu->Signature.Sequence.Reserved = 0;171 172 *pexpected_response_sequence_number = ++server->sequence_number;173 ++server->sequence_number;174 175 rc = cifs_calc_signature(rqst, server, smb_signature);176 if (rc)177 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);178 else179 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);180 181 return rc;182}183 184int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,185 __u32 *pexpected_response_sequence)186{187 struct smb_rqst rqst = { .rq_iov = iov,188 .rq_nvec = n_vec };189 190 return cifs_sign_rqst(&rqst, server, pexpected_response_sequence);191}192 193/* must be called with server->srv_mutex held */194int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,195 __u32 *pexpected_response_sequence_number)196{197 struct kvec iov[2];198 199 iov[0].iov_base = cifs_pdu;200 iov[0].iov_len = 4;201 iov[1].iov_base = (char *)cifs_pdu + 4;202 iov[1].iov_len = be32_to_cpu(cifs_pdu->smb_buf_length);203 204 return cifs_sign_smbv(iov, 2, server,205 pexpected_response_sequence_number);206}207 208int cifs_verify_signature(struct smb_rqst *rqst,209 struct TCP_Server_Info *server,210 __u32 expected_sequence_number)211{212 unsigned int rc;213 char server_response_sig[8];214 char what_we_think_sig_should_be[20];215 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;216 217 if (rqst->rq_iov[0].iov_len != 4 ||218 rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)219 return -EIO;220 221 if (cifs_pdu == NULL || server == NULL)222 return -EINVAL;223 224 if (!server->session_estab)225 return 0;226 227 if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {228 struct smb_com_lock_req *pSMB =229 (struct smb_com_lock_req *)cifs_pdu;230 if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)231 return 0;232 }233 234 /* BB what if signatures are supposed to be on for session but235 server does not send one? BB */236 237 /* Do not need to verify session setups with signature "BSRSPYL " */238 if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)239 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",240 cifs_pdu->Command);241 242 /* save off the original signature so we can modify the smb and check243 its signature against what the server sent */244 memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);245 246 cifs_pdu->Signature.Sequence.SequenceNumber =247 cpu_to_le32(expected_sequence_number);248 cifs_pdu->Signature.Sequence.Reserved = 0;249 250 cifs_server_lock(server);251 rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);252 cifs_server_unlock(server);253 254 if (rc)255 return rc;256 257/* cifs_dump_mem("what we think it should be: ",258 what_we_think_sig_should_be, 16); */259 260 if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))261 return -EACCES;262 else263 return 0;264 265}266 267/* Build a proper attribute value/target info pairs blob.268 * Fill in netbios and dns domain name and workstation name269 * and client time (total five av pairs and + one end of fields indicator.270 * Allocate domain name which gets freed when session struct is deallocated.271 */272static int273build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)274{275 unsigned int dlen;276 unsigned int size = 2 * sizeof(struct ntlmssp2_name);277 char *defdmname = "WORKGROUP";278 unsigned char *blobptr;279 struct ntlmssp2_name *attrptr;280 281 if (!ses->domainName) {282 ses->domainName = kstrdup(defdmname, GFP_KERNEL);283 if (!ses->domainName)284 return -ENOMEM;285 }286 287 dlen = strlen(ses->domainName);288 289 /*290 * The length of this blob is two times the size of a291 * structure (av pair) which holds name/size292 * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +293 * unicode length of a netbios domain name294 */295 kfree_sensitive(ses->auth_key.response);296 ses->auth_key.len = size + 2 * dlen;297 ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);298 if (!ses->auth_key.response) {299 ses->auth_key.len = 0;300 return -ENOMEM;301 }302 303 blobptr = ses->auth_key.response;304 attrptr = (struct ntlmssp2_name *) blobptr;305 306 /*307 * As defined in MS-NTLM 3.3.2, just this av pair field308 * is sufficient as part of the temp309 */310 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);311 attrptr->length = cpu_to_le16(2 * dlen);312 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);313 cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);314 315 return 0;316}317 318/* Server has provided av pairs/target info in the type 2 challenge319 * packet and we have plucked it and stored within smb session.320 * We parse that blob here to find netbios domain name to be used321 * as part of ntlmv2 authentication (in Target String), if not already322 * specified on the command line.323 * If this function returns without any error but without fetching324 * domain name, authentication may fail against some server but325 * may not fail against other (those who are not very particular326 * about target string i.e. for some, just user name might suffice.327 */328static int329find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)330{331 unsigned int attrsize;332 unsigned int type;333 unsigned int onesize = sizeof(struct ntlmssp2_name);334 unsigned char *blobptr;335 unsigned char *blobend;336 struct ntlmssp2_name *attrptr;337 338 if (!ses->auth_key.len || !ses->auth_key.response)339 return 0;340 341 blobptr = ses->auth_key.response;342 blobend = blobptr + ses->auth_key.len;343 344 while (blobptr + onesize < blobend) {345 attrptr = (struct ntlmssp2_name *) blobptr;346 type = le16_to_cpu(attrptr->type);347 if (type == NTLMSSP_AV_EOL)348 break;349 blobptr += 2; /* advance attr type */350 attrsize = le16_to_cpu(attrptr->length);351 blobptr += 2; /* advance attr size */352 if (blobptr + attrsize > blobend)353 break;354 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {355 if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN)356 break;357 if (!ses->domainName) {358 ses->domainName =359 kmalloc(attrsize + 1, GFP_KERNEL);360 if (!ses->domainName)361 return -ENOMEM;362 cifs_from_utf16(ses->domainName,363 (__le16 *)blobptr, attrsize, attrsize,364 nls_cp, NO_MAP_UNI_RSVD);365 break;366 }367 }368 blobptr += attrsize; /* advance attr value */369 }370 371 return 0;372}373 374/* Server has provided av pairs/target info in the type 2 challenge375 * packet and we have plucked it and stored within smb session.376 * We parse that blob here to find the server given timestamp377 * as part of ntlmv2 authentication (or local current time as378 * default in case of failure)379 */380static __le64381find_timestamp(struct cifs_ses *ses)382{383 unsigned int attrsize;384 unsigned int type;385 unsigned int onesize = sizeof(struct ntlmssp2_name);386 unsigned char *blobptr;387 unsigned char *blobend;388 struct ntlmssp2_name *attrptr;389 struct timespec64 ts;390 391 if (!ses->auth_key.len || !ses->auth_key.response)392 return 0;393 394 blobptr = ses->auth_key.response;395 blobend = blobptr + ses->auth_key.len;396 397 while (blobptr + onesize < blobend) {398 attrptr = (struct ntlmssp2_name *) blobptr;399 type = le16_to_cpu(attrptr->type);400 if (type == NTLMSSP_AV_EOL)401 break;402 blobptr += 2; /* advance attr type */403 attrsize = le16_to_cpu(attrptr->length);404 blobptr += 2; /* advance attr size */405 if (blobptr + attrsize > blobend)406 break;407 if (type == NTLMSSP_AV_TIMESTAMP) {408 if (attrsize == sizeof(u64))409 return *((__le64 *)blobptr);410 }411 blobptr += attrsize; /* advance attr value */412 }413 414 ktime_get_real_ts64(&ts);415 return cpu_to_le64(cifs_UnixTimeToNT(ts));416}417 418static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,419 const struct nls_table *nls_cp, struct shash_desc *hmacmd5)420{421 int rc = 0;422 int len;423 char nt_hash[CIFS_NTHASH_SIZE];424 __le16 *user;425 wchar_t *domain;426 wchar_t *server;427 428 /* calculate md4 hash of password */429 E_md4hash(ses->password, nt_hash, nls_cp);430 431 rc = crypto_shash_setkey(hmacmd5->tfm, nt_hash, CIFS_NTHASH_SIZE);432 if (rc) {433 cifs_dbg(VFS, "%s: Could not set NT hash as a key, rc=%d\n", __func__, rc);434 return rc;435 }436 437 rc = crypto_shash_init(hmacmd5);438 if (rc) {439 cifs_dbg(VFS, "%s: Could not init HMAC-MD5, rc=%d\n", __func__, rc);440 return rc;441 }442 443 /* convert ses->user_name to unicode */444 len = ses->user_name ? strlen(ses->user_name) : 0;445 user = kmalloc(2 + (len * 2), GFP_KERNEL);446 if (user == NULL)447 return -ENOMEM;448 449 if (len) {450 len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);451 UniStrupr(user);452 } else {453 *(u16 *)user = 0;454 }455 456 rc = crypto_shash_update(hmacmd5, (char *)user, 2 * len);457 kfree(user);458 if (rc) {459 cifs_dbg(VFS, "%s: Could not update with user, rc=%d\n", __func__, rc);460 return rc;461 }462 463 /* convert ses->domainName to unicode and uppercase */464 if (ses->domainName) {465 len = strlen(ses->domainName);466 467 domain = kmalloc(2 + (len * 2), GFP_KERNEL);468 if (domain == NULL)469 return -ENOMEM;470 471 len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,472 nls_cp);473 rc = crypto_shash_update(hmacmd5, (char *)domain, 2 * len);474 kfree(domain);475 if (rc) {476 cifs_dbg(VFS, "%s: Could not update with domain, rc=%d\n", __func__, rc);477 return rc;478 }479 } else {480 /* We use ses->ip_addr if no domain name available */481 len = strlen(ses->ip_addr);482 483 server = kmalloc(2 + (len * 2), GFP_KERNEL);484 if (server == NULL)485 return -ENOMEM;486 487 len = cifs_strtoUTF16((__le16 *)server, ses->ip_addr, len, nls_cp);488 rc = crypto_shash_update(hmacmd5, (char *)server, 2 * len);489 kfree(server);490 if (rc) {491 cifs_dbg(VFS, "%s: Could not update with server, rc=%d\n", __func__, rc);492 return rc;493 }494 }495 496 rc = crypto_shash_final(hmacmd5, ntlmv2_hash);497 if (rc)498 cifs_dbg(VFS, "%s: Could not generate MD5 hash, rc=%d\n", __func__, rc);499 500 return rc;501}502 503static int504CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash, struct shash_desc *hmacmd5)505{506 int rc;507 struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *)508 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);509 unsigned int hash_len;510 511 /* The MD5 hash starts at challenge_key.key */512 hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE +513 offsetof(struct ntlmv2_resp, challenge.key[0]));514 515 rc = crypto_shash_setkey(hmacmd5->tfm, ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);516 if (rc) {517 cifs_dbg(VFS, "%s: Could not set NTLMv2 hash as a key, rc=%d\n", __func__, rc);518 return rc;519 }520 521 rc = crypto_shash_init(hmacmd5);522 if (rc) {523 cifs_dbg(VFS, "%s: Could not init HMAC-MD5, rc=%d\n", __func__, rc);524 return rc;525 }526 527 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)528 memcpy(ntlmv2->challenge.key, ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);529 else530 memcpy(ntlmv2->challenge.key, ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);531 532 rc = crypto_shash_update(hmacmd5, ntlmv2->challenge.key, hash_len);533 if (rc) {534 cifs_dbg(VFS, "%s: Could not update with response, rc=%d\n", __func__, rc);535 return rc;536 }537 538 /* Note that the MD5 digest over writes anon.challenge_key.key */539 rc = crypto_shash_final(hmacmd5, ntlmv2->ntlmv2_hash);540 if (rc)541 cifs_dbg(VFS, "%s: Could not generate MD5 hash, rc=%d\n", __func__, rc);542 543 return rc;544}545 546int547setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)548{549 struct shash_desc *hmacmd5 = NULL;550 int rc;551 int baselen;552 unsigned int tilen;553 struct ntlmv2_resp *ntlmv2;554 char ntlmv2_hash[16];555 unsigned char *tiblob = NULL; /* target info blob */556 __le64 rsp_timestamp;557 558 if (nls_cp == NULL) {559 cifs_dbg(VFS, "%s called with nls_cp==NULL\n", __func__);560 return -EINVAL;561 }562 563 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) {564 if (!ses->domainName) {565 if (ses->domainAuto) {566 rc = find_domain_name(ses, nls_cp);567 if (rc) {568 cifs_dbg(VFS, "error %d finding domain name\n",569 rc);570 goto setup_ntlmv2_rsp_ret;571 }572 } else {573 ses->domainName = kstrdup("", GFP_KERNEL);574 }575 }576 } else {577 rc = build_avpair_blob(ses, nls_cp);578 if (rc) {579 cifs_dbg(VFS, "error %d building av pair blob\n", rc);580 goto setup_ntlmv2_rsp_ret;581 }582 }583 584 /* Must be within 5 minutes of the server (or in range +/-2h585 * in case of Mac OS X), so simply carry over server timestamp586 * (as Windows 7 does)587 */588 rsp_timestamp = find_timestamp(ses);589 590 baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);591 tilen = ses->auth_key.len;592 tiblob = ses->auth_key.response;593 594 ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);595 if (!ses->auth_key.response) {596 rc = -ENOMEM;597 ses->auth_key.len = 0;598 goto setup_ntlmv2_rsp_ret;599 }600 ses->auth_key.len += baselen;601 602 ntlmv2 = (struct ntlmv2_resp *)603 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);604 ntlmv2->blob_signature = cpu_to_le32(0x00000101);605 ntlmv2->reserved = 0;606 ntlmv2->time = rsp_timestamp;607 608 get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal));609 ntlmv2->reserved2 = 0;610 611 memcpy(ses->auth_key.response + baselen, tiblob, tilen);612 613 cifs_server_lock(ses->server);614 615 rc = cifs_alloc_hash("hmac(md5)", &hmacmd5);616 if (rc) {617 cifs_dbg(VFS, "Could not allocate HMAC-MD5, rc=%d\n", rc);618 goto unlock;619 }620 621 /* calculate ntlmv2_hash */622 rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp, hmacmd5);623 if (rc) {624 cifs_dbg(VFS, "Could not get NTLMv2 hash, rc=%d\n", rc);625 goto unlock;626 }627 628 /* calculate first part of the client response (CR1) */629 rc = CalcNTLMv2_response(ses, ntlmv2_hash, hmacmd5);630 if (rc) {631 cifs_dbg(VFS, "Could not calculate CR1, rc=%d\n", rc);632 goto unlock;633 }634 635 /* now calculate the session key for NTLMv2 */636 rc = crypto_shash_setkey(hmacmd5->tfm, ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);637 if (rc) {638 cifs_dbg(VFS, "%s: Could not set NTLMv2 hash as a key, rc=%d\n", __func__, rc);639 goto unlock;640 }641 642 rc = crypto_shash_init(hmacmd5);643 if (rc) {644 cifs_dbg(VFS, "%s: Could not init HMAC-MD5, rc=%d\n", __func__, rc);645 goto unlock;646 }647 648 rc = crypto_shash_update(hmacmd5, ntlmv2->ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);649 if (rc) {650 cifs_dbg(VFS, "%s: Could not update with response, rc=%d\n", __func__, rc);651 goto unlock;652 }653 654 rc = crypto_shash_final(hmacmd5, ses->auth_key.response);655 if (rc)656 cifs_dbg(VFS, "%s: Could not generate MD5 hash, rc=%d\n", __func__, rc);657unlock:658 cifs_server_unlock(ses->server);659 cifs_free_hash(&hmacmd5);660setup_ntlmv2_rsp_ret:661 kfree_sensitive(tiblob);662 663 return rc;664}665 666int667calc_seckey(struct cifs_ses *ses)668{669 unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */670 struct arc4_ctx *ctx_arc4;671 672 if (fips_enabled)673 return -ENODEV;674 675 get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);676 677 ctx_arc4 = kmalloc(sizeof(*ctx_arc4), GFP_KERNEL);678 if (!ctx_arc4) {679 cifs_dbg(VFS, "Could not allocate arc4 context\n");680 return -ENOMEM;681 }682 683 cifs_arc4_setkey(ctx_arc4, ses->auth_key.response, CIFS_SESS_KEY_SIZE);684 cifs_arc4_crypt(ctx_arc4, ses->ntlmssp->ciphertext, sec_key,685 CIFS_CPHTXT_SIZE);686 687 /* make secondary_key/nonce as session key */688 memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);689 /* and make len as that of session key only */690 ses->auth_key.len = CIFS_SESS_KEY_SIZE;691 692 memzero_explicit(sec_key, CIFS_SESS_KEY_SIZE);693 kfree_sensitive(ctx_arc4);694 return 0;695}696 697void698cifs_crypto_secmech_release(struct TCP_Server_Info *server)699{700 cifs_free_hash(&server->secmech.aes_cmac);701 cifs_free_hash(&server->secmech.hmacsha256);702 cifs_free_hash(&server->secmech.md5);703 cifs_free_hash(&server->secmech.sha512);704 705 if (!SERVER_IS_CHAN(server)) {706 if (server->secmech.enc) {707 crypto_free_aead(server->secmech.enc);708 server->secmech.enc = NULL;709 }710 711 if (server->secmech.dec) {712 crypto_free_aead(server->secmech.dec);713 server->secmech.dec = NULL;714 }715 } else {716 server->secmech.enc = NULL;717 server->secmech.dec = NULL;718 }719}720