![Jeff Layton](/assets/img/avatar_default.png)
The server->sequence_number is already protected by the srv_mutex. The GlobalMid_lock is unneeded here. Reviewed-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
752 lines
22 KiB
C
752 lines
22 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 "md5.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 */
|
|
/* Note that the smb header signature field on input contains the
|
|
sequence number before this function is called */
|
|
|
|
extern void mdfour(unsigned char *out, unsigned char *in, int n);
|
|
extern void E_md4hash(const unsigned char *passwd, unsigned char *p16);
|
|
extern void SMBencrypt(unsigned char *passwd, const unsigned char *c8,
|
|
unsigned char *p24);
|
|
|
|
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: Oould not init md5\n", __func__);
|
|
return rc;
|
|
}
|
|
|
|
crypto_shash_update(&server->secmech.sdescmd5->shash,
|
|
server->session_key.response, server->session_key.len);
|
|
|
|
crypto_shash_update(&server->secmech.sdescmd5->shash,
|
|
cifs_pdu->Protocol, cifs_pdu->smb_buf_length);
|
|
|
|
rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* 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) == 0)
|
|
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: Oould not init md5\n", __func__);
|
|
return rc;
|
|
}
|
|
|
|
crypto_shash_update(&server->secmech.sdescmd5->shash,
|
|
server->session_key.response, server->session_key.len);
|
|
|
|
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 */
|
|
crypto_shash_update(&server->secmech.sdescmd5->shash,
|
|
iov[i].iov_base + 4, iov[i].iov_len - 4);
|
|
} else
|
|
crypto_shash_update(&server->secmech.sdescmd5->shash,
|
|
iov[i].iov_base, iov[i].iov_len);
|
|
}
|
|
|
|
rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
|
|
|
|
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) == 0)
|
|
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 (cifs_pdu->Command == SMB_COM_NEGOTIATE)
|
|
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;
|
|
|
|
rc = cifs_calculate_signature(cifs_pdu, server,
|
|
what_we_think_sig_should_be);
|
|
|
|
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 cifsSesInfo *ses)
|
|
{
|
|
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;
|
|
|
|
SMBNTencrypt(ses->password, ses->server->cryptkey,
|
|
ses->auth_key.response + CIFS_SESS_KEY_SIZE);
|
|
|
|
E_md4hash(ses->password, temp_key);
|
|
mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_CIFS_WEAK_PW_HASH
|
|
void calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
|
|
char *lnm_session_key)
|
|
{
|
|
int i;
|
|
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;
|
|
}
|
|
|
|
/* 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]);
|
|
|
|
SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
|
|
|
|
/* clear password before we return/free memory */
|
|
memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
|
|
}
|
|
#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 cifsSesInfo *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 cifsSesInfo *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 cifsSesInfo *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);
|
|
|
|
crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
|
|
CIFS_NTHASH_SIZE);
|
|
|
|
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->userName to unicode and uppercase */
|
|
len = strlen(ses->userName);
|
|
user = kmalloc(2 + (len * 2), GFP_KERNEL);
|
|
if (user == NULL) {
|
|
cERROR(1, "calc_ntlmv2_hash: user mem alloc failure\n");
|
|
rc = -ENOMEM;
|
|
goto calc_exit_2;
|
|
}
|
|
len = cifs_strtoUCS((__le16 *)user, ses->userName, len, nls_cp);
|
|
UniStrupr(user);
|
|
|
|
crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
|
|
(char *)user, 2 * len);
|
|
|
|
/* 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;
|
|
goto calc_exit_1;
|
|
}
|
|
len = cifs_strtoUCS((__le16 *)domain, ses->domainName, len,
|
|
nls_cp);
|
|
crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
|
|
(char *)domain, 2 * len);
|
|
kfree(domain);
|
|
} 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;
|
|
goto calc_exit_1;
|
|
}
|
|
len = cifs_strtoUCS((__le16 *)server, ses->serverName, len,
|
|
nls_cp);
|
|
crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
|
|
(char *)server, 2 * len);
|
|
kfree(server);
|
|
}
|
|
|
|
rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
|
|
ntlmv2_hash);
|
|
|
|
calc_exit_1:
|
|
kfree(user);
|
|
calc_exit_2:
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
CalcNTLMv2_response(const struct cifsSesInfo *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;
|
|
}
|
|
|
|
crypto_shash_setkey(ses->server->secmech.hmacmd5,
|
|
ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
|
|
|
|
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);
|
|
crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
|
|
ses->auth_key.response + offset, ses->auth_key.len - offset);
|
|
|
|
rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
|
|
ses->auth_key.response + CIFS_SESS_KEY_SIZE);
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
int
|
|
setup_ntlmv2_rsp(struct cifsSesInfo *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 */
|
|
crypto_shash_setkey(ses->server->secmech.hmacmd5,
|
|
ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
|
|
|
|
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;
|
|
}
|
|
|
|
crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
|
|
ses->auth_key.response + CIFS_SESS_KEY_SIZE,
|
|
CIFS_HMAC_MD5_HASH_SIZE);
|
|
|
|
rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
|
|
ses->auth_key.response);
|
|
|
|
setup_ntlmv2_rsp_ret:
|
|
kfree(tiblob);
|
|
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
calc_seckey(struct cifsSesInfo *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 (!tfm_arc4 || IS_ERR(tfm_arc4)) {
|
|
cERROR(1, "could not allocate crypto API arc4\n");
|
|
return PTR_ERR(tfm_arc4);
|
|
}
|
|
|
|
desc.tfm = tfm_arc4;
|
|
|
|
crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response,
|
|
CIFS_SESS_KEY_SIZE);
|
|
|
|
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 0;
|
|
}
|
|
|
|
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 (!server->secmech.hmacmd5 ||
|
|
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 (!server->secmech.md5 || 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;
|
|
}
|