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linux-next/fs/cifs/cifsencrypt.c
Peter Seiderer 98ce94c8df cifs: use server timestamp for ntlmv2 authentication
Linux cifs mount with ntlmssp against an Mac OS X (Yosemite
10.10.5) share fails in case the clocks differ more than +/-2h:

digest-service: digest-request: od failed with 2 proto=ntlmv2
digest-service: digest-request: kdc failed with -1561745592 proto=ntlmv2

Fix this by (re-)using the given server timestamp for the
ntlmv2 authentication (as Windows 7 does).

A related problem was also reported earlier by Namjae Jaen (see below):

Windows machine has extended security feature which refuse to allow
authentication when there is time difference between server time and
client time when ntlmv2 negotiation is used. This problem is prevalent
in embedded enviornment where system time is set to default 1970.

Modern servers send the server timestamp in the TargetInfo Av_Pair
structure in the challenge message [see MS-NLMP 2.2.2.1]
In [MS-NLMP 3.1.5.1.2] it is explicitly mentioned that the client must
use the server provided timestamp if present OR current time if it is
not

Reported-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Steve French <smfrench@gmail.com>
CC: Stable <stable@vger.kernel.org>
2015-09-22 15:24:02 -05:00

868 lines
24 KiB
C

/*
* fs/cifs/cifsencrypt.c
*
* Encryption and hashing operations relating to NTLM, NTLMv2. See MS-NLMP
* for more detailed information
*
* Copyright (C) International Business Machines Corp., 2005,2013
* Author(s): Steve French (sfrench@us.ibm.com)
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/fs.h>
#include <linux/slab.h>
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifs_debug.h"
#include "cifs_unicode.h"
#include "cifsproto.h"
#include "ntlmssp.h"
#include <linux/ctype.h>
#include <linux/random.h>
#include <linux/highmem.h>
static int
cifs_crypto_shash_md5_allocate(struct TCP_Server_Info *server)
{
int rc;
unsigned int size;
if (server->secmech.sdescmd5 != NULL)
return 0; /* already allocated */
server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
if (IS_ERR(server->secmech.md5)) {
cifs_dbg(VFS, "could not allocate crypto md5\n");
rc = PTR_ERR(server->secmech.md5);
server->secmech.md5 = NULL;
return rc;
}
size = sizeof(struct shash_desc) +
crypto_shash_descsize(server->secmech.md5);
server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
if (!server->secmech.sdescmd5) {
crypto_free_shash(server->secmech.md5);
server->secmech.md5 = NULL;
return -ENOMEM;
}
server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
server->secmech.sdescmd5->shash.flags = 0x0;
return 0;
}
/*
* Calculate and return the CIFS signature based on the mac key and SMB PDU.
* The 16 byte signature must be allocated by the caller. Note we only use the
* 1st eight bytes and that the smb header signature field on input contains
* the sequence number before this function is called. Also, this function
* should be called with the server->srv_mutex held.
*/
static int cifs_calc_signature(struct smb_rqst *rqst,
struct TCP_Server_Info *server, char *signature)
{
int i;
int rc;
struct kvec *iov = rqst->rq_iov;
int n_vec = rqst->rq_nvec;
if (iov == NULL || signature == NULL || server == NULL)
return -EINVAL;
if (!server->secmech.sdescmd5) {
rc = cifs_crypto_shash_md5_allocate(server);
if (rc) {
cifs_dbg(VFS, "%s: Can't alloc md5 crypto\n", __func__);
return -1;
}
}
rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
if (rc) {
cifs_dbg(VFS, "%s: Could not init md5\n", __func__);
return rc;
}
rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
server->session_key.response, server->session_key.len);
if (rc) {
cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
return rc;
}
for (i = 0; i < n_vec; i++) {
if (iov[i].iov_len == 0)
continue;
if (iov[i].iov_base == NULL) {
cifs_dbg(VFS, "null iovec entry\n");
return -EIO;
}
/* The first entry includes a length field (which does not get
signed that occupies the first 4 bytes before the header */
if (i == 0) {
if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
break; /* nothing to sign or corrupt header */
rc =
crypto_shash_update(&server->secmech.sdescmd5->shash,
iov[i].iov_base + 4, iov[i].iov_len - 4);
} else {
rc =
crypto_shash_update(&server->secmech.sdescmd5->shash,
iov[i].iov_base, iov[i].iov_len);
}
if (rc) {
cifs_dbg(VFS, "%s: Could not update with payload\n",
__func__);
return rc;
}
}
/* now hash over the rq_pages array */
for (i = 0; i < rqst->rq_npages; i++) {
struct kvec p_iov;
cifs_rqst_page_to_kvec(rqst, i, &p_iov);
crypto_shash_update(&server->secmech.sdescmd5->shash,
p_iov.iov_base, p_iov.iov_len);
kunmap(rqst->rq_pages[i]);
}
rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
if (rc)
cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
return rc;
}
/* must be called with server->srv_mutex held */
int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server,
__u32 *pexpected_response_sequence_number)
{
int rc = 0;
char smb_signature[20];
struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
if ((cifs_pdu == NULL) || (server == NULL))
return -EINVAL;
if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
server->tcpStatus == CifsNeedNegotiate)
return rc;
if (!server->session_estab) {
memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
return rc;
}
cifs_pdu->Signature.Sequence.SequenceNumber =
cpu_to_le32(server->sequence_number);
cifs_pdu->Signature.Sequence.Reserved = 0;
*pexpected_response_sequence_number = ++server->sequence_number;
++server->sequence_number;
rc = cifs_calc_signature(rqst, server, smb_signature);
if (rc)
memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
else
memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
return rc;
}
int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
__u32 *pexpected_response_sequence)
{
struct smb_rqst rqst = { .rq_iov = iov,
.rq_nvec = n_vec };
return cifs_sign_rqst(&rqst, server, pexpected_response_sequence);
}
/* must be called with server->srv_mutex held */
int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
__u32 *pexpected_response_sequence_number)
{
struct kvec iov;
iov.iov_base = cifs_pdu;
iov.iov_len = be32_to_cpu(cifs_pdu->smb_buf_length) + 4;
return cifs_sign_smbv(&iov, 1, server,
pexpected_response_sequence_number);
}
int cifs_verify_signature(struct smb_rqst *rqst,
struct TCP_Server_Info *server,
__u32 expected_sequence_number)
{
unsigned int rc;
char server_response_sig[8];
char what_we_think_sig_should_be[20];
struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
if (cifs_pdu == NULL || server == NULL)
return -EINVAL;
if (!server->session_estab)
return 0;
if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
struct smb_com_lock_req *pSMB =
(struct smb_com_lock_req *)cifs_pdu;
if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
return 0;
}
/* BB what if signatures are supposed to be on for session but
server does not send one? BB */
/* Do not need to verify session setups with signature "BSRSPYL " */
if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
cifs_pdu->Command);
/* save off the origiginal signature so we can modify the smb and check
its signature against what the server sent */
memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
cifs_pdu->Signature.Sequence.SequenceNumber =
cpu_to_le32(expected_sequence_number);
cifs_pdu->Signature.Sequence.Reserved = 0;
mutex_lock(&server->srv_mutex);
rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);
mutex_unlock(&server->srv_mutex);
if (rc)
return rc;
/* cifs_dump_mem("what we think it should be: ",
what_we_think_sig_should_be, 16); */
if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
return -EACCES;
else
return 0;
}
/* first calculate 24 bytes ntlm response and then 16 byte session key */
int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp)
{
int rc = 0;
unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
char temp_key[CIFS_SESS_KEY_SIZE];
if (!ses)
return -EINVAL;
ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
if (!ses->auth_key.response)
return -ENOMEM;
ses->auth_key.len = temp_len;
rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp);
if (rc) {
cifs_dbg(FYI, "%s Can't generate NTLM response, error: %d\n",
__func__, rc);
return rc;
}
rc = E_md4hash(ses->password, temp_key, nls_cp);
if (rc) {
cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n",
__func__, rc);
return rc;
}
rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
if (rc)
cifs_dbg(FYI, "%s Can't generate NTLM session key, error: %d\n",
__func__, rc);
return rc;
}
#ifdef CONFIG_CIFS_WEAK_PW_HASH
int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
char *lnm_session_key)
{
int i;
int rc;
char password_with_pad[CIFS_ENCPWD_SIZE];
memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
if (password)
strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
memcpy(lnm_session_key, password_with_pad,
CIFS_ENCPWD_SIZE);
return 0;
}
/* calculate old style session key */
/* calling toupper is less broken than repeatedly
calling nls_toupper would be since that will never
work for UTF8, but neither handles multibyte code pages
but the only alternative would be converting to UCS-16 (Unicode)
(using a routine something like UniStrupr) then
uppercasing and then converting back from Unicode - which
would only worth doing it if we knew it were utf8. Basically
utf8 and other multibyte codepages each need their own strupper
function since a byte at a time will ont work. */
for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
password_with_pad[i] = toupper(password_with_pad[i]);
rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
return rc;
}
#endif /* CIFS_WEAK_PW_HASH */
/* Build a proper attribute value/target info pairs blob.
* Fill in netbios and dns domain name and workstation name
* and client time (total five av pairs and + one end of fields indicator.
* Allocate domain name which gets freed when session struct is deallocated.
*/
static int
build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
{
unsigned int dlen;
unsigned int size = 2 * sizeof(struct ntlmssp2_name);
char *defdmname = "WORKGROUP";
unsigned char *blobptr;
struct ntlmssp2_name *attrptr;
if (!ses->domainName) {
ses->domainName = kstrdup(defdmname, GFP_KERNEL);
if (!ses->domainName)
return -ENOMEM;
}
dlen = strlen(ses->domainName);
/*
* The length of this blob is two times the size of a
* structure (av pair) which holds name/size
* ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
* unicode length of a netbios domain name
*/
ses->auth_key.len = size + 2 * dlen;
ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
if (!ses->auth_key.response) {
ses->auth_key.len = 0;
return -ENOMEM;
}
blobptr = ses->auth_key.response;
attrptr = (struct ntlmssp2_name *) blobptr;
/*
* As defined in MS-NTLM 3.3.2, just this av pair field
* is sufficient as part of the temp
*/
attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
attrptr->length = cpu_to_le16(2 * dlen);
blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
return 0;
}
/* Server has provided av pairs/target info in the type 2 challenge
* packet and we have plucked it and stored within smb session.
* We parse that blob here to find netbios domain name to be used
* as part of ntlmv2 authentication (in Target String), if not already
* specified on the command line.
* If this function returns without any error but without fetching
* domain name, authentication may fail against some server but
* may not fail against other (those who are not very particular
* about target string i.e. for some, just user name might suffice.
*/
static int
find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
{
unsigned int attrsize;
unsigned int type;
unsigned int onesize = sizeof(struct ntlmssp2_name);
unsigned char *blobptr;
unsigned char *blobend;
struct ntlmssp2_name *attrptr;
if (!ses->auth_key.len || !ses->auth_key.response)
return 0;
blobptr = ses->auth_key.response;
blobend = blobptr + ses->auth_key.len;
while (blobptr + onesize < blobend) {
attrptr = (struct ntlmssp2_name *) blobptr;
type = le16_to_cpu(attrptr->type);
if (type == NTLMSSP_AV_EOL)
break;
blobptr += 2; /* advance attr type */
attrsize = le16_to_cpu(attrptr->length);
blobptr += 2; /* advance attr size */
if (blobptr + attrsize > blobend)
break;
if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN)
break;
if (!ses->domainName) {
ses->domainName =
kmalloc(attrsize + 1, GFP_KERNEL);
if (!ses->domainName)
return -ENOMEM;
cifs_from_utf16(ses->domainName,
(__le16 *)blobptr, attrsize, attrsize,
nls_cp, NO_MAP_UNI_RSVD);
break;
}
}
blobptr += attrsize; /* advance attr value */
}
return 0;
}
/* Server has provided av pairs/target info in the type 2 challenge
* packet and we have plucked it and stored within smb session.
* We parse that blob here to find the server given timestamp
* as part of ntlmv2 authentication (or local current time as
* default in case of failure)
*/
static __le64
find_timestamp(struct cifs_ses *ses)
{
unsigned int attrsize;
unsigned int type;
unsigned int onesize = sizeof(struct ntlmssp2_name);
unsigned char *blobptr;
unsigned char *blobend;
struct ntlmssp2_name *attrptr;
if (!ses->auth_key.len || !ses->auth_key.response)
return 0;
blobptr = ses->auth_key.response;
blobend = blobptr + ses->auth_key.len;
while (blobptr + onesize < blobend) {
attrptr = (struct ntlmssp2_name *) blobptr;
type = le16_to_cpu(attrptr->type);
if (type == NTLMSSP_AV_EOL)
break;
blobptr += 2; /* advance attr type */
attrsize = le16_to_cpu(attrptr->length);
blobptr += 2; /* advance attr size */
if (blobptr + attrsize > blobend)
break;
if (type == NTLMSSP_AV_TIMESTAMP) {
if (attrsize == sizeof(u64))
return *((__le64 *)blobptr);
}
blobptr += attrsize; /* advance attr value */
}
return cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
}
static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
const struct nls_table *nls_cp)
{
int rc = 0;
int len;
char nt_hash[CIFS_NTHASH_SIZE];
__le16 *user;
wchar_t *domain;
wchar_t *server;
if (!ses->server->secmech.sdeschmacmd5) {
cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
return -1;
}
/* calculate md4 hash of password */
E_md4hash(ses->password, nt_hash, nls_cp);
rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
CIFS_NTHASH_SIZE);
if (rc) {
cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__);
return rc;
}
rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
if (rc) {
cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
return rc;
}
/* convert ses->user_name to unicode */
len = ses->user_name ? strlen(ses->user_name) : 0;
user = kmalloc(2 + (len * 2), GFP_KERNEL);
if (user == NULL) {
rc = -ENOMEM;
return rc;
}
if (len) {
len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);
UniStrupr(user);
} else {
memset(user, '\0', 2);
}
rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
(char *)user, 2 * len);
kfree(user);
if (rc) {
cifs_dbg(VFS, "%s: Could not update with user\n", __func__);
return rc;
}
/* convert ses->domainName to unicode and uppercase */
if (ses->domainName) {
len = strlen(ses->domainName);
domain = kmalloc(2 + (len * 2), GFP_KERNEL);
if (domain == NULL) {
rc = -ENOMEM;
return rc;
}
len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
nls_cp);
rc =
crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
(char *)domain, 2 * len);
kfree(domain);
if (rc) {
cifs_dbg(VFS, "%s: Could not update with domain\n",
__func__);
return rc;
}
} else {
/* We use ses->serverName if no domain name available */
len = strlen(ses->serverName);
server = kmalloc(2 + (len * 2), GFP_KERNEL);
if (server == NULL) {
rc = -ENOMEM;
return rc;
}
len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len,
nls_cp);
rc =
crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
(char *)server, 2 * len);
kfree(server);
if (rc) {
cifs_dbg(VFS, "%s: Could not update with server\n",
__func__);
return rc;
}
}
rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
ntlmv2_hash);
if (rc)
cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
return rc;
}
static int
CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
{
int rc;
struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *)
(ses->auth_key.response + CIFS_SESS_KEY_SIZE);
unsigned int hash_len;
/* The MD5 hash starts at challenge_key.key */
hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE +
offsetof(struct ntlmv2_resp, challenge.key[0]));
if (!ses->server->secmech.sdeschmacmd5) {
cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
return -1;
}
rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
if (rc) {
cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
__func__);
return rc;
}
rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
if (rc) {
cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
return rc;
}
if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)
memcpy(ntlmv2->challenge.key,
ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
else
memcpy(ntlmv2->challenge.key,
ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
ntlmv2->challenge.key, hash_len);
if (rc) {
cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
return rc;
}
/* Note that the MD5 digest over writes anon.challenge_key.key */
rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
ntlmv2->ntlmv2_hash);
if (rc)
cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
return rc;
}
static int crypto_hmacmd5_alloc(struct TCP_Server_Info *server)
{
int rc;
unsigned int size;
/* check if already allocated */
if (server->secmech.sdeschmacmd5)
return 0;
server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
if (IS_ERR(server->secmech.hmacmd5)) {
cifs_dbg(VFS, "could not allocate crypto hmacmd5\n");
rc = PTR_ERR(server->secmech.hmacmd5);
server->secmech.hmacmd5 = NULL;
return rc;
}
size = sizeof(struct shash_desc) +
crypto_shash_descsize(server->secmech.hmacmd5);
server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
if (!server->secmech.sdeschmacmd5) {
crypto_free_shash(server->secmech.hmacmd5);
server->secmech.hmacmd5 = NULL;
return -ENOMEM;
}
server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
server->secmech.sdeschmacmd5->shash.flags = 0x0;
return 0;
}
int
setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
{
int rc;
int baselen;
unsigned int tilen;
struct ntlmv2_resp *ntlmv2;
char ntlmv2_hash[16];
unsigned char *tiblob = NULL; /* target info blob */
__le64 rsp_timestamp;
if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) {
if (!ses->domainName) {
rc = find_domain_name(ses, nls_cp);
if (rc) {
cifs_dbg(VFS, "error %d finding domain name\n",
rc);
goto setup_ntlmv2_rsp_ret;
}
}
} else {
rc = build_avpair_blob(ses, nls_cp);
if (rc) {
cifs_dbg(VFS, "error %d building av pair blob\n", rc);
goto setup_ntlmv2_rsp_ret;
}
}
/* Must be within 5 minutes of the server (or in range +/-2h
* in case of Mac OS X), so simply carry over server timestamp
* (as Windows 7 does)
*/
rsp_timestamp = find_timestamp(ses);
baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
tilen = ses->auth_key.len;
tiblob = ses->auth_key.response;
ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
if (!ses->auth_key.response) {
rc = ENOMEM;
ses->auth_key.len = 0;
goto setup_ntlmv2_rsp_ret;
}
ses->auth_key.len += baselen;
ntlmv2 = (struct ntlmv2_resp *)
(ses->auth_key.response + CIFS_SESS_KEY_SIZE);
ntlmv2->blob_signature = cpu_to_le32(0x00000101);
ntlmv2->reserved = 0;
ntlmv2->time = rsp_timestamp;
get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal));
ntlmv2->reserved2 = 0;
memcpy(ses->auth_key.response + baselen, tiblob, tilen);
rc = crypto_hmacmd5_alloc(ses->server);
if (rc) {
cifs_dbg(VFS, "could not crypto alloc hmacmd5 rc %d\n", rc);
goto setup_ntlmv2_rsp_ret;
}
/* calculate ntlmv2_hash */
rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
if (rc) {
cifs_dbg(VFS, "could not get v2 hash rc %d\n", rc);
goto setup_ntlmv2_rsp_ret;
}
/* calculate first part of the client response (CR1) */
rc = CalcNTLMv2_response(ses, ntlmv2_hash);
if (rc) {
cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc);
goto setup_ntlmv2_rsp_ret;
}
/* now calculate the session key for NTLMv2 */
rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
if (rc) {
cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
__func__);
goto setup_ntlmv2_rsp_ret;
}
rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
if (rc) {
cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
goto setup_ntlmv2_rsp_ret;
}
rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
ntlmv2->ntlmv2_hash,
CIFS_HMAC_MD5_HASH_SIZE);
if (rc) {
cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
goto setup_ntlmv2_rsp_ret;
}
rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
ses->auth_key.response);
if (rc)
cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
setup_ntlmv2_rsp_ret:
kfree(tiblob);
return rc;
}
int
calc_seckey(struct cifs_ses *ses)
{
int rc;
struct crypto_blkcipher *tfm_arc4;
struct scatterlist sgin, sgout;
struct blkcipher_desc desc;
unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(tfm_arc4)) {
rc = PTR_ERR(tfm_arc4);
cifs_dbg(VFS, "could not allocate crypto API arc4\n");
return rc;
}
desc.tfm = tfm_arc4;
rc = crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response,
CIFS_SESS_KEY_SIZE);
if (rc) {
cifs_dbg(VFS, "%s: Could not set response as a key\n",
__func__);
return rc;
}
sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE);
if (rc) {
cifs_dbg(VFS, "could not encrypt session key rc: %d\n", rc);
crypto_free_blkcipher(tfm_arc4);
return rc;
}
/* make secondary_key/nonce as session key */
memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
/* and make len as that of session key only */
ses->auth_key.len = CIFS_SESS_KEY_SIZE;
crypto_free_blkcipher(tfm_arc4);
return rc;
}
void
cifs_crypto_shash_release(struct TCP_Server_Info *server)
{
if (server->secmech.cmacaes) {
crypto_free_shash(server->secmech.cmacaes);
server->secmech.cmacaes = NULL;
}
if (server->secmech.hmacsha256) {
crypto_free_shash(server->secmech.hmacsha256);
server->secmech.hmacsha256 = NULL;
}
if (server->secmech.md5) {
crypto_free_shash(server->secmech.md5);
server->secmech.md5 = NULL;
}
if (server->secmech.hmacmd5) {
crypto_free_shash(server->secmech.hmacmd5);
server->secmech.hmacmd5 = NULL;
}
kfree(server->secmech.sdesccmacaes);
server->secmech.sdesccmacaes = NULL;
kfree(server->secmech.sdeschmacsha256);
server->secmech.sdeschmacsha256 = NULL;
kfree(server->secmech.sdeschmacmd5);
server->secmech.sdeschmacmd5 = NULL;
kfree(server->secmech.sdescmd5);
server->secmech.sdescmd5 = NULL;
}