210 lines
6.5 KiB
C
210 lines
6.5 KiB
C
/*
|
|
* fs/cifs/cifsencrypt.c
|
|
*
|
|
* Copyright (C) International Business Machines Corp., 2003
|
|
* 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 "cifspdu.h"
|
|
#include "cifsglob.h"
|
|
#include "cifs_debug.h"
|
|
#include "md5.h"
|
|
#include "cifs_unicode.h"
|
|
#include "cifsproto.h"
|
|
|
|
/* Calculate and return the CIFS signature based on the mac key and the 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);
|
|
|
|
static int cifs_calculate_signature(const struct smb_hdr * cifs_pdu, const char * key, char * signature)
|
|
{
|
|
struct MD5Context context;
|
|
|
|
if((cifs_pdu == NULL) || (signature == NULL))
|
|
return -EINVAL;
|
|
|
|
MD5Init(&context);
|
|
MD5Update(&context,key,CIFS_SESSION_KEY_SIZE+16);
|
|
MD5Update(&context,cifs_pdu->Protocol,cifs_pdu->smb_buf_length);
|
|
MD5Final(signature,&context);
|
|
return 0;
|
|
}
|
|
|
|
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];
|
|
|
|
/* BB remember to initialize sequence number elsewhere and initialize mac_signing key elsewhere BB */
|
|
/* BB remember to add code to save expected sequence number in midQ entry BB */
|
|
|
|
if((cifs_pdu == NULL) || (server == NULL))
|
|
return -EINVAL;
|
|
|
|
if((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
|
|
return rc;
|
|
|
|
spin_lock(&GlobalMid_Lock);
|
|
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++;
|
|
spin_unlock(&GlobalMid_Lock);
|
|
|
|
rc = cifs_calculate_signature(cifs_pdu, server->mac_signing_key,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, const char * mac_key,
|
|
__u32 expected_sequence_number)
|
|
{
|
|
unsigned int rc;
|
|
char server_response_sig[8];
|
|
char what_we_think_sig_should_be[20];
|
|
|
|
if((cifs_pdu == NULL) || (mac_key == 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, mac_key,
|
|
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;
|
|
|
|
}
|
|
|
|
/* We fill in key by putting in 40 byte array which was allocated by caller */
|
|
int cifs_calculate_mac_key(char * key, const char * rn, const char * password)
|
|
{
|
|
char temp_key[16];
|
|
if ((key == NULL) || (rn == NULL))
|
|
return -EINVAL;
|
|
|
|
E_md4hash(password, temp_key);
|
|
mdfour(key,temp_key,16);
|
|
memcpy(key+16,rn, CIFS_SESSION_KEY_SIZE);
|
|
return 0;
|
|
}
|
|
|
|
int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses, struct nls_table * nls_info)
|
|
{
|
|
char temp_hash[16];
|
|
struct HMACMD5Context ctx;
|
|
char * ucase_buf;
|
|
__le16 * unicode_buf;
|
|
unsigned int i,user_name_len,dom_name_len;
|
|
|
|
if(ses == NULL)
|
|
return -EINVAL;
|
|
|
|
E_md4hash(ses->password, temp_hash);
|
|
|
|
hmac_md5_init_limK_to_64(temp_hash, 16, &ctx);
|
|
user_name_len = strlen(ses->userName);
|
|
if(user_name_len > MAX_USERNAME_SIZE)
|
|
return -EINVAL;
|
|
dom_name_len = strlen(ses->domainName);
|
|
if(dom_name_len > MAX_USERNAME_SIZE)
|
|
return -EINVAL;
|
|
|
|
ucase_buf = kmalloc((MAX_USERNAME_SIZE+1), GFP_KERNEL);
|
|
if(ucase_buf == NULL)
|
|
return -ENOMEM;
|
|
unicode_buf = kmalloc((MAX_USERNAME_SIZE+1)*4, GFP_KERNEL);
|
|
if(unicode_buf == NULL) {
|
|
kfree(ucase_buf);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
for(i=0;i<user_name_len;i++)
|
|
ucase_buf[i] = nls_info->charset2upper[(int)ses->userName[i]];
|
|
ucase_buf[i] = 0;
|
|
user_name_len = cifs_strtoUCS(unicode_buf, ucase_buf, MAX_USERNAME_SIZE*2, nls_info);
|
|
unicode_buf[user_name_len] = 0;
|
|
user_name_len++;
|
|
|
|
for(i=0;i<dom_name_len;i++)
|
|
ucase_buf[i] = nls_info->charset2upper[(int)ses->domainName[i]];
|
|
ucase_buf[i] = 0;
|
|
dom_name_len = cifs_strtoUCS(unicode_buf+user_name_len, ucase_buf, MAX_USERNAME_SIZE*2, nls_info);
|
|
|
|
unicode_buf[user_name_len + dom_name_len] = 0;
|
|
hmac_md5_update((const unsigned char *) unicode_buf,
|
|
(user_name_len+dom_name_len)*2,&ctx);
|
|
|
|
hmac_md5_final(ses->server->mac_signing_key,&ctx);
|
|
kfree(ucase_buf);
|
|
kfree(unicode_buf);
|
|
return 0;
|
|
}
|
|
void CalcNTLMv2_response(const struct cifsSesInfo * ses,char * v2_session_response)
|
|
{
|
|
struct HMACMD5Context context;
|
|
memcpy(v2_session_response + 8, ses->server->cryptKey,8);
|
|
/* gen_blob(v2_session_response + 16); */
|
|
hmac_md5_init_limK_to_64(ses->server->mac_signing_key, 16, &context);
|
|
|
|
hmac_md5_update(ses->server->cryptKey,8,&context);
|
|
/* hmac_md5_update(v2_session_response+16)client thing,8,&context); */ /* BB fix */
|
|
|
|
hmac_md5_final(v2_session_response,&context);
|
|
}
|