kernel-ark/fs/cifs/cifsencrypt.c
Jeff Layton 998d6fcb24 cifs: don't start signing too early
Sniffing traffic on the wire shows that windows clients send a zeroed
out signature field in a NEGOTIATE request, and send "BSRSPYL" in the
signature field during SESSION_SETUP. Make the cifs client behave the
same way.

It doesn't seem to make much difference in any server that I've tested
against, but it's probably best to follow windows behavior as closely as
possible here.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-07-31 21:21:06 +00:00

843 lines
23 KiB
C

/*
* fs/cifs/cifsencrypt.c
*
* Copyright (C) International Business Machines Corp., 2005,2006
* 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>
/*
* 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_calculate_signature(const struct smb_hdr *cifs_pdu,
struct TCP_Server_Info *server, char *signature)
{
int rc;
if (cifs_pdu == NULL || signature == NULL || server == NULL)
return -EINVAL;
if (!server->secmech.sdescmd5) {
cERROR(1, "%s: Can't generate signature\n", __func__);
return -1;
}
rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
if (rc) {
cERROR(1, "%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) {
cERROR(1, "%s: Could not update with response\n", __func__);
return rc;
}
rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
cifs_pdu->Protocol, be32_to_cpu(cifs_pdu->smb_buf_length));
if (rc) {
cERROR(1, "%s: Could not update with payload\n", __func__);
return rc;
}
rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
if (rc)
cERROR(1, "%s: Could not generate md5 hash\n", __func__);
return rc;
}
/* 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)
{
int rc = 0;
char smb_signature[20];
if ((cifs_pdu == NULL) || (server == NULL))
return -EINVAL;
if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
server->tcpStatus == CifsNeedNegotiate)
return rc;
if (!server->session_estab) {
strncpy(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_calculate_signature(cifs_pdu, server, smb_signature);
if (rc)
memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
else
memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
return rc;
}
static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
struct TCP_Server_Info *server, char *signature)
{
int i;
int rc;
if (iov == NULL || signature == NULL || server == NULL)
return -EINVAL;
if (!server->secmech.sdescmd5) {
cERROR(1, "%s: Can't generate signature\n", __func__);
return -1;
}
rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
if (rc) {
cERROR(1, "%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) {
cERROR(1, "%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) {
cERROR(1, "null iovec entry");
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) {
cERROR(1, "%s: Could not update with payload\n",
__func__);
return rc;
}
}
rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
if (rc)
cERROR(1, "%s: Could not generate md5 hash\n", __func__);
return rc;
}
/* must be called with server->srv_mutex held */
int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
__u32 *pexpected_response_sequence_number)
{
int rc = 0;
char smb_signature[20];
struct smb_hdr *cifs_pdu = 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) {
strncpy(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_signature2(iov, n_vec, 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_verify_signature(struct smb_hdr *cifs_pdu,
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];
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)
cFYI(1, "dummy signature received for smb command 0x%x",
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_calculate_signature(cifs_pdu, 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)
{
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) {
cERROR(1, "NTLM can't allocate (%u bytes) memory", temp_len);
return -ENOMEM;
}
ses->auth_key.len = temp_len;
rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
ses->auth_key.response + CIFS_SESS_KEY_SIZE);
if (rc) {
cFYI(1, "%s Can't generate NTLM response, error: %d",
__func__, rc);
return rc;
}
rc = E_md4hash(ses->password, temp_key);
if (rc) {
cFYI(1, "%s Can't generate NT hash, error: %d", __func__, rc);
return rc;
}
rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
if (rc)
cFYI(1, "%s Can't generate NTLM session key, error: %d",
__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) {
memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE);
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 wlen;
unsigned int size = 6 * sizeof(struct ntlmssp2_name);
__le64 curtime;
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);
wlen = strlen(ses->server->hostname);
/* The length of this blob is a size which is
* six times the size of a structure which holds name/size +
* two times the unicode length of a domain name +
* two times the unicode length of a server name +
* size of a timestamp (which is 8 bytes).
*/
ses->auth_key.len = size + 2 * (2 * dlen) + 2 * (2 * wlen) + 8;
ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
if (!ses->auth_key.response) {
ses->auth_key.len = 0;
cERROR(1, "Challenge target info allocation failure");
return -ENOMEM;
}
blobptr = ses->auth_key.response;
attrptr = (struct ntlmssp2_name *) blobptr;
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_strtoUCS((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
blobptr += 2 * dlen;
attrptr = (struct ntlmssp2_name *) blobptr;
attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_COMPUTER_NAME);
attrptr->length = cpu_to_le16(2 * wlen);
blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
cifs_strtoUCS((__le16 *)blobptr, ses->server->hostname, wlen, nls_cp);
blobptr += 2 * wlen;
attrptr = (struct ntlmssp2_name *) blobptr;
attrptr->type = cpu_to_le16(NTLMSSP_AV_DNS_DOMAIN_NAME);
attrptr->length = cpu_to_le16(2 * dlen);
blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
cifs_strtoUCS((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
blobptr += 2 * dlen;
attrptr = (struct ntlmssp2_name *) blobptr;
attrptr->type = cpu_to_le16(NTLMSSP_AV_DNS_COMPUTER_NAME);
attrptr->length = cpu_to_le16(2 * wlen);
blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
cifs_strtoUCS((__le16 *)blobptr, ses->server->hostname, wlen, nls_cp);
blobptr += 2 * wlen;
attrptr = (struct ntlmssp2_name *) blobptr;
attrptr->type = cpu_to_le16(NTLMSSP_AV_TIMESTAMP);
attrptr->length = cpu_to_le16(sizeof(__le64));
blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
curtime = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
memcpy(blobptr, &curtime, sizeof(__le64));
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)
break;
if (!ses->domainName) {
ses->domainName =
kmalloc(attrsize + 1, GFP_KERNEL);
if (!ses->domainName)
return -ENOMEM;
cifs_from_ucs2(ses->domainName,
(__le16 *)blobptr, attrsize, attrsize,
nls_cp, false);
break;
}
}
blobptr += attrsize; /* advance attr value */
}
return 0;
}
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];
wchar_t *user;
wchar_t *domain;
wchar_t *server;
if (!ses->server->secmech.sdeschmacmd5) {
cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
return -1;
}
/* calculate md4 hash of password */
E_md4hash(ses->password, nt_hash);
rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
CIFS_NTHASH_SIZE);
if (rc) {
cERROR(1, "%s: Could not set NT Hash as a key", __func__);
return rc;
}
rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
if (rc) {
cERROR(1, "calc_ntlmv2_hash: could not init hmacmd5\n");
return rc;
}
/* convert ses->user_name to unicode and uppercase */
len = strlen(ses->user_name);
user = kmalloc(2 + (len * 2), GFP_KERNEL);
if (user == NULL) {
cERROR(1, "calc_ntlmv2_hash: user mem alloc failure\n");
rc = -ENOMEM;
return rc;
}
len = cifs_strtoUCS((__le16 *)user, ses->user_name, len, nls_cp);
UniStrupr(user);
rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
(char *)user, 2 * len);
kfree(user);
if (rc) {
cERROR(1, "%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) {
cERROR(1, "calc_ntlmv2_hash: domain mem alloc failure");
rc = -ENOMEM;
return rc;
}
len = cifs_strtoUCS((__le16 *)domain, ses->domainName, len,
nls_cp);
rc =
crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
(char *)domain, 2 * len);
kfree(domain);
if (rc) {
cERROR(1, "%s: Could not update with domain\n",
__func__);
return rc;
}
} else if (ses->serverName) {
len = strlen(ses->serverName);
server = kmalloc(2 + (len * 2), GFP_KERNEL);
if (server == NULL) {
cERROR(1, "calc_ntlmv2_hash: server mem alloc failure");
rc = -ENOMEM;
return rc;
}
len = cifs_strtoUCS((__le16 *)server, ses->serverName, len,
nls_cp);
rc =
crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
(char *)server, 2 * len);
kfree(server);
if (rc) {
cERROR(1, "%s: Could not update with server\n",
__func__);
return rc;
}
}
rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
ntlmv2_hash);
if (rc)
cERROR(1, "%s: Could not generate md5 hash\n", __func__);
return rc;
}
static int
CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
{
int rc;
unsigned int offset = CIFS_SESS_KEY_SIZE + 8;
if (!ses->server->secmech.sdeschmacmd5) {
cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
return -1;
}
rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
if (rc) {
cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__);
return rc;
}
rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
if (rc) {
cERROR(1, "CalcNTLMv2_response: could not init hmacmd5");
return rc;
}
if (ses->server->secType == RawNTLMSSP)
memcpy(ses->auth_key.response + offset,
ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
else
memcpy(ses->auth_key.response + offset,
ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
ses->auth_key.response + offset, ses->auth_key.len - offset);
if (rc) {
cERROR(1, "%s: Could not update with response\n", __func__);
return rc;
}
rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
ses->auth_key.response + CIFS_SESS_KEY_SIZE);
if (rc)
cERROR(1, "%s: Could not generate md5 hash\n", __func__);
return rc;
}
int
setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
{
int rc;
int baselen;
unsigned int tilen;
struct ntlmv2_resp *buf;
char ntlmv2_hash[16];
unsigned char *tiblob = NULL; /* target info blob */
if (ses->server->secType == RawNTLMSSP) {
if (!ses->domainName) {
rc = find_domain_name(ses, nls_cp);
if (rc) {
cERROR(1, "error %d finding domain name", rc);
goto setup_ntlmv2_rsp_ret;
}
}
} else {
rc = build_avpair_blob(ses, nls_cp);
if (rc) {
cERROR(1, "error %d building av pair blob", rc);
goto setup_ntlmv2_rsp_ret;
}
}
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;
cERROR(1, "%s: Can't allocate auth blob", __func__);
goto setup_ntlmv2_rsp_ret;
}
ses->auth_key.len += baselen;
buf = (struct ntlmv2_resp *)
(ses->auth_key.response + CIFS_SESS_KEY_SIZE);
buf->blob_signature = cpu_to_le32(0x00000101);
buf->reserved = 0;
buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
buf->reserved2 = 0;
memcpy(ses->auth_key.response + baselen, tiblob, tilen);
/* calculate ntlmv2_hash */
rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
if (rc) {
cERROR(1, "could not get v2 hash rc %d", rc);
goto setup_ntlmv2_rsp_ret;
}
/* calculate first part of the client response (CR1) */
rc = CalcNTLMv2_response(ses, ntlmv2_hash);
if (rc) {
cERROR(1, "Could not calculate CR1 rc: %d", 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) {
cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__);
goto setup_ntlmv2_rsp_ret;
}
rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
if (rc) {
cERROR(1, "%s: Could not init hmacmd5\n", __func__);
goto setup_ntlmv2_rsp_ret;
}
rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
ses->auth_key.response + CIFS_SESS_KEY_SIZE,
CIFS_HMAC_MD5_HASH_SIZE);
if (rc) {
cERROR(1, "%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)
cERROR(1, "%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);
cERROR(1, "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) {
cERROR(1, "%s: Could not set response as a key", __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) {
cERROR(1, "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.md5)
crypto_free_shash(server->secmech.md5);
if (server->secmech.hmacmd5)
crypto_free_shash(server->secmech.hmacmd5);
kfree(server->secmech.sdeschmacmd5);
kfree(server->secmech.sdescmd5);
}
int
cifs_crypto_shash_allocate(struct TCP_Server_Info *server)
{
int rc;
unsigned int size;
server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
if (IS_ERR(server->secmech.hmacmd5)) {
cERROR(1, "could not allocate crypto hmacmd5\n");
return PTR_ERR(server->secmech.hmacmd5);
}
server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
if (IS_ERR(server->secmech.md5)) {
cERROR(1, "could not allocate crypto md5\n");
rc = PTR_ERR(server->secmech.md5);
goto crypto_allocate_md5_fail;
}
size = sizeof(struct shash_desc) +
crypto_shash_descsize(server->secmech.hmacmd5);
server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
if (!server->secmech.sdeschmacmd5) {
cERROR(1, "cifs_crypto_shash_allocate: can't alloc hmacmd5\n");
rc = -ENOMEM;
goto crypto_allocate_hmacmd5_sdesc_fail;
}
server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
server->secmech.sdeschmacmd5->shash.flags = 0x0;
size = sizeof(struct shash_desc) +
crypto_shash_descsize(server->secmech.md5);
server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
if (!server->secmech.sdescmd5) {
cERROR(1, "cifs_crypto_shash_allocate: can't alloc md5\n");
rc = -ENOMEM;
goto crypto_allocate_md5_sdesc_fail;
}
server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
server->secmech.sdescmd5->shash.flags = 0x0;
return 0;
crypto_allocate_md5_sdesc_fail:
kfree(server->secmech.sdeschmacmd5);
crypto_allocate_hmacmd5_sdesc_fail:
crypto_free_shash(server->secmech.md5);
crypto_allocate_md5_fail:
crypto_free_shash(server->secmech.hmacmd5);
return rc;
}