cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

cifsencrypt.c (20604B)


      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
     27int __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	int is_smb2 = server->vals->header_preamble_size == 0;
     36
     37	/* iov[0] is actual data and not the rfc1002 length for SMB2+ */
     38	if (is_smb2) {
     39		if (iov[0].iov_len <= 4)
     40			return -EIO;
     41		i = 0;
     42	} else {
     43		if (n_vec < 2 || iov[0].iov_len != 4)
     44			return -EIO;
     45		i = 1; /* skip rfc1002 length */
     46	}
     47
     48	for (; i < n_vec; i++) {
     49		if (iov[i].iov_len == 0)
     50			continue;
     51		if (iov[i].iov_base == NULL) {
     52			cifs_dbg(VFS, "null iovec entry\n");
     53			return -EIO;
     54		}
     55
     56		rc = crypto_shash_update(shash,
     57					 iov[i].iov_base, iov[i].iov_len);
     58		if (rc) {
     59			cifs_dbg(VFS, "%s: Could not update with payload\n",
     60				 __func__);
     61			return rc;
     62		}
     63	}
     64
     65	/* now hash over the rq_pages array */
     66	for (i = 0; i < rqst->rq_npages; i++) {
     67		void *kaddr;
     68		unsigned int len, offset;
     69
     70		rqst_page_get_length(rqst, i, &len, &offset);
     71
     72		kaddr = (char *) kmap(rqst->rq_pages[i]) + offset;
     73
     74		rc = crypto_shash_update(shash, kaddr, len);
     75		if (rc) {
     76			cifs_dbg(VFS, "%s: Could not update with payload\n",
     77				 __func__);
     78			kunmap(rqst->rq_pages[i]);
     79			return rc;
     80		}
     81
     82		kunmap(rqst->rq_pages[i]);
     83	}
     84
     85	rc = crypto_shash_final(shash, signature);
     86	if (rc)
     87		cifs_dbg(VFS, "%s: Could not generate hash\n", __func__);
     88
     89	return rc;
     90}
     91
     92/*
     93 * Calculate and return the CIFS signature based on the mac key and SMB PDU.
     94 * The 16 byte signature must be allocated by the caller. Note we only use the
     95 * 1st eight bytes and that the smb header signature field on input contains
     96 * the sequence number before this function is called. Also, this function
     97 * should be called with the server->srv_mutex held.
     98 */
     99static int cifs_calc_signature(struct smb_rqst *rqst,
    100			struct TCP_Server_Info *server, char *signature)
    101{
    102	int rc;
    103
    104	if (!rqst->rq_iov || !signature || !server)
    105		return -EINVAL;
    106
    107	rc = cifs_alloc_hash("md5", &server->secmech.md5,
    108			     &server->secmech.sdescmd5);
    109	if (rc)
    110		return -1;
    111
    112	rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
    113	if (rc) {
    114		cifs_dbg(VFS, "%s: Could not init md5\n", __func__);
    115		return rc;
    116	}
    117
    118	rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
    119		server->session_key.response, server->session_key.len);
    120	if (rc) {
    121		cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
    122		return rc;
    123	}
    124
    125	return __cifs_calc_signature(rqst, server, signature,
    126				     &server->secmech.sdescmd5->shash);
    127}
    128
    129/* must be called with server->srv_mutex held */
    130int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server,
    131		   __u32 *pexpected_response_sequence_number)
    132{
    133	int rc = 0;
    134	char smb_signature[20];
    135	struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
    136
    137	if (rqst->rq_iov[0].iov_len != 4 ||
    138	    rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
    139		return -EIO;
    140
    141	if ((cifs_pdu == NULL) || (server == NULL))
    142		return -EINVAL;
    143
    144	spin_lock(&cifs_tcp_ses_lock);
    145	if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
    146	    server->tcpStatus == CifsNeedNegotiate) {
    147		spin_unlock(&cifs_tcp_ses_lock);
    148		return rc;
    149	}
    150	spin_unlock(&cifs_tcp_ses_lock);
    151
    152	if (!server->session_estab) {
    153		memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
    154		return rc;
    155	}
    156
    157	cifs_pdu->Signature.Sequence.SequenceNumber =
    158				cpu_to_le32(server->sequence_number);
    159	cifs_pdu->Signature.Sequence.Reserved = 0;
    160
    161	*pexpected_response_sequence_number = ++server->sequence_number;
    162	++server->sequence_number;
    163
    164	rc = cifs_calc_signature(rqst, server, smb_signature);
    165	if (rc)
    166		memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
    167	else
    168		memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
    169
    170	return rc;
    171}
    172
    173int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
    174		   __u32 *pexpected_response_sequence)
    175{
    176	struct smb_rqst rqst = { .rq_iov = iov,
    177				 .rq_nvec = n_vec };
    178
    179	return cifs_sign_rqst(&rqst, server, pexpected_response_sequence);
    180}
    181
    182/* must be called with server->srv_mutex held */
    183int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
    184		  __u32 *pexpected_response_sequence_number)
    185{
    186	struct kvec iov[2];
    187
    188	iov[0].iov_base = cifs_pdu;
    189	iov[0].iov_len = 4;
    190	iov[1].iov_base = (char *)cifs_pdu + 4;
    191	iov[1].iov_len = be32_to_cpu(cifs_pdu->smb_buf_length);
    192
    193	return cifs_sign_smbv(iov, 2, server,
    194			      pexpected_response_sequence_number);
    195}
    196
    197int cifs_verify_signature(struct smb_rqst *rqst,
    198			  struct TCP_Server_Info *server,
    199			  __u32 expected_sequence_number)
    200{
    201	unsigned int rc;
    202	char server_response_sig[8];
    203	char what_we_think_sig_should_be[20];
    204	struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
    205
    206	if (rqst->rq_iov[0].iov_len != 4 ||
    207	    rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
    208		return -EIO;
    209
    210	if (cifs_pdu == NULL || server == NULL)
    211		return -EINVAL;
    212
    213	if (!server->session_estab)
    214		return 0;
    215
    216	if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
    217		struct smb_com_lock_req *pSMB =
    218			(struct smb_com_lock_req *)cifs_pdu;
    219		if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
    220			return 0;
    221	}
    222
    223	/* BB what if signatures are supposed to be on for session but
    224	   server does not send one? BB */
    225
    226	/* Do not need to verify session setups with signature "BSRSPYL "  */
    227	if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
    228		cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
    229			 cifs_pdu->Command);
    230
    231	/* save off the origiginal signature so we can modify the smb and check
    232		its signature against what the server sent */
    233	memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
    234
    235	cifs_pdu->Signature.Sequence.SequenceNumber =
    236					cpu_to_le32(expected_sequence_number);
    237	cifs_pdu->Signature.Sequence.Reserved = 0;
    238
    239	cifs_server_lock(server);
    240	rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);
    241	cifs_server_unlock(server);
    242
    243	if (rc)
    244		return rc;
    245
    246/*	cifs_dump_mem("what we think it should be: ",
    247		      what_we_think_sig_should_be, 16); */
    248
    249	if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
    250		return -EACCES;
    251	else
    252		return 0;
    253
    254}
    255
    256/* Build a proper attribute value/target info pairs blob.
    257 * Fill in netbios and dns domain name and workstation name
    258 * and client time (total five av pairs and + one end of fields indicator.
    259 * Allocate domain name which gets freed when session struct is deallocated.
    260 */
    261static int
    262build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
    263{
    264	unsigned int dlen;
    265	unsigned int size = 2 * sizeof(struct ntlmssp2_name);
    266	char *defdmname = "WORKGROUP";
    267	unsigned char *blobptr;
    268	struct ntlmssp2_name *attrptr;
    269
    270	if (!ses->domainName) {
    271		ses->domainName = kstrdup(defdmname, GFP_KERNEL);
    272		if (!ses->domainName)
    273			return -ENOMEM;
    274	}
    275
    276	dlen = strlen(ses->domainName);
    277
    278	/*
    279	 * The length of this blob is two times the size of a
    280	 * structure (av pair) which holds name/size
    281	 * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
    282	 * unicode length of a netbios domain name
    283	 */
    284	ses->auth_key.len = size + 2 * dlen;
    285	ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
    286	if (!ses->auth_key.response) {
    287		ses->auth_key.len = 0;
    288		return -ENOMEM;
    289	}
    290
    291	blobptr = ses->auth_key.response;
    292	attrptr = (struct ntlmssp2_name *) blobptr;
    293
    294	/*
    295	 * As defined in MS-NTLM 3.3.2, just this av pair field
    296	 * is sufficient as part of the temp
    297	 */
    298	attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
    299	attrptr->length = cpu_to_le16(2 * dlen);
    300	blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
    301	cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
    302
    303	return 0;
    304}
    305
    306/* Server has provided av pairs/target info in the type 2 challenge
    307 * packet and we have plucked it and stored within smb session.
    308 * We parse that blob here to find netbios domain name to be used
    309 * as part of ntlmv2 authentication (in Target String), if not already
    310 * specified on the command line.
    311 * If this function returns without any error but without fetching
    312 * domain name, authentication may fail against some server but
    313 * may not fail against other (those who are not very particular
    314 * about target string i.e. for some, just user name might suffice.
    315 */
    316static int
    317find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
    318{
    319	unsigned int attrsize;
    320	unsigned int type;
    321	unsigned int onesize = sizeof(struct ntlmssp2_name);
    322	unsigned char *blobptr;
    323	unsigned char *blobend;
    324	struct ntlmssp2_name *attrptr;
    325
    326	if (!ses->auth_key.len || !ses->auth_key.response)
    327		return 0;
    328
    329	blobptr = ses->auth_key.response;
    330	blobend = blobptr + ses->auth_key.len;
    331
    332	while (blobptr + onesize < blobend) {
    333		attrptr = (struct ntlmssp2_name *) blobptr;
    334		type = le16_to_cpu(attrptr->type);
    335		if (type == NTLMSSP_AV_EOL)
    336			break;
    337		blobptr += 2; /* advance attr type */
    338		attrsize = le16_to_cpu(attrptr->length);
    339		blobptr += 2; /* advance attr size */
    340		if (blobptr + attrsize > blobend)
    341			break;
    342		if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
    343			if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN)
    344				break;
    345			if (!ses->domainName) {
    346				ses->domainName =
    347					kmalloc(attrsize + 1, GFP_KERNEL);
    348				if (!ses->domainName)
    349						return -ENOMEM;
    350				cifs_from_utf16(ses->domainName,
    351					(__le16 *)blobptr, attrsize, attrsize,
    352					nls_cp, NO_MAP_UNI_RSVD);
    353				break;
    354			}
    355		}
    356		blobptr += attrsize; /* advance attr  value */
    357	}
    358
    359	return 0;
    360}
    361
    362/* Server has provided av pairs/target info in the type 2 challenge
    363 * packet and we have plucked it and stored within smb session.
    364 * We parse that blob here to find the server given timestamp
    365 * as part of ntlmv2 authentication (or local current time as
    366 * default in case of failure)
    367 */
    368static __le64
    369find_timestamp(struct cifs_ses *ses)
    370{
    371	unsigned int attrsize;
    372	unsigned int type;
    373	unsigned int onesize = sizeof(struct ntlmssp2_name);
    374	unsigned char *blobptr;
    375	unsigned char *blobend;
    376	struct ntlmssp2_name *attrptr;
    377	struct timespec64 ts;
    378
    379	if (!ses->auth_key.len || !ses->auth_key.response)
    380		return 0;
    381
    382	blobptr = ses->auth_key.response;
    383	blobend = blobptr + ses->auth_key.len;
    384
    385	while (blobptr + onesize < blobend) {
    386		attrptr = (struct ntlmssp2_name *) blobptr;
    387		type = le16_to_cpu(attrptr->type);
    388		if (type == NTLMSSP_AV_EOL)
    389			break;
    390		blobptr += 2; /* advance attr type */
    391		attrsize = le16_to_cpu(attrptr->length);
    392		blobptr += 2; /* advance attr size */
    393		if (blobptr + attrsize > blobend)
    394			break;
    395		if (type == NTLMSSP_AV_TIMESTAMP) {
    396			if (attrsize == sizeof(u64))
    397				return *((__le64 *)blobptr);
    398		}
    399		blobptr += attrsize; /* advance attr value */
    400	}
    401
    402	ktime_get_real_ts64(&ts);
    403	return cpu_to_le64(cifs_UnixTimeToNT(ts));
    404}
    405
    406static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
    407			    const struct nls_table *nls_cp)
    408{
    409	int rc = 0;
    410	int len;
    411	char nt_hash[CIFS_NTHASH_SIZE];
    412	__le16 *user;
    413	wchar_t *domain;
    414	wchar_t *server;
    415
    416	if (!ses->server->secmech.sdeschmacmd5) {
    417		cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
    418		return -1;
    419	}
    420
    421	/* calculate md4 hash of password */
    422	E_md4hash(ses->password, nt_hash, nls_cp);
    423
    424	rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
    425				CIFS_NTHASH_SIZE);
    426	if (rc) {
    427		cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__);
    428		return rc;
    429	}
    430
    431	rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
    432	if (rc) {
    433		cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
    434		return rc;
    435	}
    436
    437	/* convert ses->user_name to unicode */
    438	len = ses->user_name ? strlen(ses->user_name) : 0;
    439	user = kmalloc(2 + (len * 2), GFP_KERNEL);
    440	if (user == NULL) {
    441		rc = -ENOMEM;
    442		return rc;
    443	}
    444
    445	if (len) {
    446		len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);
    447		UniStrupr(user);
    448	} else {
    449		memset(user, '\0', 2);
    450	}
    451
    452	rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
    453				(char *)user, 2 * len);
    454	kfree(user);
    455	if (rc) {
    456		cifs_dbg(VFS, "%s: Could not update with user\n", __func__);
    457		return rc;
    458	}
    459
    460	/* convert ses->domainName to unicode and uppercase */
    461	if (ses->domainName) {
    462		len = strlen(ses->domainName);
    463
    464		domain = kmalloc(2 + (len * 2), GFP_KERNEL);
    465		if (domain == NULL) {
    466			rc = -ENOMEM;
    467			return rc;
    468		}
    469		len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
    470				      nls_cp);
    471		rc =
    472		crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
    473					(char *)domain, 2 * len);
    474		kfree(domain);
    475		if (rc) {
    476			cifs_dbg(VFS, "%s: Could not update with domain\n",
    477				 __func__);
    478			return rc;
    479		}
    480	} else {
    481		/* We use ses->ip_addr if no domain name available */
    482		len = strlen(ses->ip_addr);
    483
    484		server = kmalloc(2 + (len * 2), GFP_KERNEL);
    485		if (server == NULL) {
    486			rc = -ENOMEM;
    487			return rc;
    488		}
    489		len = cifs_strtoUTF16((__le16 *)server, ses->ip_addr, len,
    490					nls_cp);
    491		rc =
    492		crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
    493					(char *)server, 2 * len);
    494		kfree(server);
    495		if (rc) {
    496			cifs_dbg(VFS, "%s: Could not update with server\n",
    497				 __func__);
    498			return rc;
    499		}
    500	}
    501
    502	rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
    503					ntlmv2_hash);
    504	if (rc)
    505		cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
    506
    507	return rc;
    508}
    509
    510static int
    511CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
    512{
    513	int rc;
    514	struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *)
    515	    (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
    516	unsigned int hash_len;
    517
    518	/* The MD5 hash starts at challenge_key.key */
    519	hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE +
    520		offsetof(struct ntlmv2_resp, challenge.key[0]));
    521
    522	if (!ses->server->secmech.sdeschmacmd5) {
    523		cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
    524		return -1;
    525	}
    526
    527	rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
    528				 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
    529	if (rc) {
    530		cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
    531			 __func__);
    532		return rc;
    533	}
    534
    535	rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
    536	if (rc) {
    537		cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
    538		return rc;
    539	}
    540
    541	if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)
    542		memcpy(ntlmv2->challenge.key,
    543		       ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
    544	else
    545		memcpy(ntlmv2->challenge.key,
    546		       ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
    547	rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
    548				 ntlmv2->challenge.key, hash_len);
    549	if (rc) {
    550		cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
    551		return rc;
    552	}
    553
    554	/* Note that the MD5 digest over writes anon.challenge_key.key */
    555	rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
    556				ntlmv2->ntlmv2_hash);
    557	if (rc)
    558		cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
    559
    560	return rc;
    561}
    562
    563int
    564setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
    565{
    566	int rc;
    567	int baselen;
    568	unsigned int tilen;
    569	struct ntlmv2_resp *ntlmv2;
    570	char ntlmv2_hash[16];
    571	unsigned char *tiblob = NULL; /* target info blob */
    572	__le64 rsp_timestamp;
    573
    574	if (nls_cp == NULL) {
    575		cifs_dbg(VFS, "%s called with nls_cp==NULL\n", __func__);
    576		return -EINVAL;
    577	}
    578
    579	if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) {
    580		if (!ses->domainName) {
    581			if (ses->domainAuto) {
    582				rc = find_domain_name(ses, nls_cp);
    583				if (rc) {
    584					cifs_dbg(VFS, "error %d finding domain name\n",
    585						 rc);
    586					goto setup_ntlmv2_rsp_ret;
    587				}
    588			} else {
    589				ses->domainName = kstrdup("", GFP_KERNEL);
    590			}
    591		}
    592	} else {
    593		rc = build_avpair_blob(ses, nls_cp);
    594		if (rc) {
    595			cifs_dbg(VFS, "error %d building av pair blob\n", rc);
    596			goto setup_ntlmv2_rsp_ret;
    597		}
    598	}
    599
    600	/* Must be within 5 minutes of the server (or in range +/-2h
    601	 * in case of Mac OS X), so simply carry over server timestamp
    602	 * (as Windows 7 does)
    603	 */
    604	rsp_timestamp = find_timestamp(ses);
    605
    606	baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
    607	tilen = ses->auth_key.len;
    608	tiblob = ses->auth_key.response;
    609
    610	ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
    611	if (!ses->auth_key.response) {
    612		rc = -ENOMEM;
    613		ses->auth_key.len = 0;
    614		goto setup_ntlmv2_rsp_ret;
    615	}
    616	ses->auth_key.len += baselen;
    617
    618	ntlmv2 = (struct ntlmv2_resp *)
    619			(ses->auth_key.response + CIFS_SESS_KEY_SIZE);
    620	ntlmv2->blob_signature = cpu_to_le32(0x00000101);
    621	ntlmv2->reserved = 0;
    622	ntlmv2->time = rsp_timestamp;
    623
    624	get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal));
    625	ntlmv2->reserved2 = 0;
    626
    627	memcpy(ses->auth_key.response + baselen, tiblob, tilen);
    628
    629	cifs_server_lock(ses->server);
    630
    631	rc = cifs_alloc_hash("hmac(md5)",
    632			     &ses->server->secmech.hmacmd5,
    633			     &ses->server->secmech.sdeschmacmd5);
    634	if (rc) {
    635		goto unlock;
    636	}
    637
    638	/* calculate ntlmv2_hash */
    639	rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
    640	if (rc) {
    641		cifs_dbg(VFS, "Could not get v2 hash rc %d\n", rc);
    642		goto unlock;
    643	}
    644
    645	/* calculate first part of the client response (CR1) */
    646	rc = CalcNTLMv2_response(ses, ntlmv2_hash);
    647	if (rc) {
    648		cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc);
    649		goto unlock;
    650	}
    651
    652	/* now calculate the session key for NTLMv2 */
    653	rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
    654		ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
    655	if (rc) {
    656		cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
    657			 __func__);
    658		goto unlock;
    659	}
    660
    661	rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
    662	if (rc) {
    663		cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
    664		goto unlock;
    665	}
    666
    667	rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
    668		ntlmv2->ntlmv2_hash,
    669		CIFS_HMAC_MD5_HASH_SIZE);
    670	if (rc) {
    671		cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
    672		goto unlock;
    673	}
    674
    675	rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
    676		ses->auth_key.response);
    677	if (rc)
    678		cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
    679
    680unlock:
    681	cifs_server_unlock(ses->server);
    682setup_ntlmv2_rsp_ret:
    683	kfree(tiblob);
    684
    685	return rc;
    686}
    687
    688int
    689calc_seckey(struct cifs_ses *ses)
    690{
    691	unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
    692	struct arc4_ctx *ctx_arc4;
    693
    694	if (fips_enabled)
    695		return -ENODEV;
    696
    697	get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
    698
    699	ctx_arc4 = kmalloc(sizeof(*ctx_arc4), GFP_KERNEL);
    700	if (!ctx_arc4) {
    701		cifs_dbg(VFS, "Could not allocate arc4 context\n");
    702		return -ENOMEM;
    703	}
    704
    705	cifs_arc4_setkey(ctx_arc4, ses->auth_key.response, CIFS_SESS_KEY_SIZE);
    706	cifs_arc4_crypt(ctx_arc4, ses->ntlmssp->ciphertext, sec_key,
    707			CIFS_CPHTXT_SIZE);
    708
    709	/* make secondary_key/nonce as session key */
    710	memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
    711	/* and make len as that of session key only */
    712	ses->auth_key.len = CIFS_SESS_KEY_SIZE;
    713
    714	memzero_explicit(sec_key, CIFS_SESS_KEY_SIZE);
    715	kfree_sensitive(ctx_arc4);
    716	return 0;
    717}
    718
    719void
    720cifs_crypto_secmech_release(struct TCP_Server_Info *server)
    721{
    722	if (server->secmech.cmacaes) {
    723		crypto_free_shash(server->secmech.cmacaes);
    724		server->secmech.cmacaes = NULL;
    725	}
    726
    727	if (server->secmech.hmacsha256) {
    728		crypto_free_shash(server->secmech.hmacsha256);
    729		server->secmech.hmacsha256 = NULL;
    730	}
    731
    732	if (server->secmech.md5) {
    733		crypto_free_shash(server->secmech.md5);
    734		server->secmech.md5 = NULL;
    735	}
    736
    737	if (server->secmech.sha512) {
    738		crypto_free_shash(server->secmech.sha512);
    739		server->secmech.sha512 = NULL;
    740	}
    741
    742	if (server->secmech.hmacmd5) {
    743		crypto_free_shash(server->secmech.hmacmd5);
    744		server->secmech.hmacmd5 = NULL;
    745	}
    746
    747	if (server->secmech.ccmaesencrypt) {
    748		crypto_free_aead(server->secmech.ccmaesencrypt);
    749		server->secmech.ccmaesencrypt = NULL;
    750	}
    751
    752	if (server->secmech.ccmaesdecrypt) {
    753		crypto_free_aead(server->secmech.ccmaesdecrypt);
    754		server->secmech.ccmaesdecrypt = NULL;
    755	}
    756
    757	kfree(server->secmech.sdesccmacaes);
    758	server->secmech.sdesccmacaes = NULL;
    759	kfree(server->secmech.sdeschmacsha256);
    760	server->secmech.sdeschmacsha256 = NULL;
    761	kfree(server->secmech.sdeschmacmd5);
    762	server->secmech.sdeschmacmd5 = NULL;
    763	kfree(server->secmech.sdescmd5);
    764	server->secmech.sdescmd5 = NULL;
    765	kfree(server->secmech.sdescsha512);
    766	server->secmech.sdescsha512 = NULL;
    767}