[mirror_ubuntu-artful-kernel.git] / fs / cifs / cifsencrypt.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 "cifspdu.h"
#include "cifsglob.h"
#include "cifs_debug.h"
#include "md5.h"
#include "cifs_unicode.h"
#include "cifsproto.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, unsigned char *c8,
		       unsigned char *p24);
	
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_SESS_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];

	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;
}

static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
				const char *key, char *signature)
{
	struct  MD5Context context;
	int i;

	if ((iov == NULL) || (signature == NULL))
		return -EINVAL;

	MD5Init(&context);
	MD5Update(&context, key, CIFS_SESS_KEY_SIZE+16);
	for (i=0;i<n_vec;i++) {
		if (iov[i].iov_base == NULL) {
			cERROR(1 ,("null iovec entry"));
			return -EIO;
		} else if (iov[i].iov_len == 0)
			break; /* bail out if we are sent nothing to sign */
		/* 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 */
			MD5Update(&context,iov[0].iov_base+4, iov[0].iov_len-4);
		} else
			MD5Update(&context, iov[i].iov_base, iov[i].iov_len);
	}

	MD5Final(signature, &context);

	return 0;
}


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;

	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_calc_signature2(iov, n_vec, 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_SESS_KEY_SIZE);
	return 0;
}

int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses, 
				const 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;
	if(ses->domainName == NULL)
		return -EINVAL; /* BB should we use CIFS_LINUX_DOM */
	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;
}

#ifdef CONFIG_CIFS_WEAK_PW_HASH
void calc_lanman_hash(struct cifsSesInfo * ses, char * lnm_session_key)
{
	int i;
	char password_with_pad[CIFS_ENCPWD_SIZE];

	if(ses->server == NULL)
		return;

	memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
	if(ses->password)
		strncpy(password_with_pad, ses->password, CIFS_ENCPWD_SIZE);

	if((ses->server->secMode & SECMODE_PW_ENCRYPT) == 0)
		if(extended_security & CIFSSEC_MAY_PLNTXT) {
			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, ses->server->cryptKey, lnm_session_key);
	/* clear password before we return/free memory */
	memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
}
#endif /* CIFS_WEAK_PW_HASH */

static int calc_ntlmv2_hash(struct cifsSesInfo *ses, 
			    const struct nls_table * nls_cp)
{
	int rc = 0;
	int len;
	char nt_hash[16];
	struct HMACMD5Context * pctxt;
	wchar_t * user;
	wchar_t * domain;

	pctxt = kmalloc(sizeof(struct HMACMD5Context), GFP_KERNEL);

	if(pctxt == NULL)
		return -ENOMEM;

	/* calculate md4 hash of password */
	E_md4hash(ses->password, nt_hash);

	/* convert Domainname to unicode and uppercase */
	hmac_md5_init_limK_to_64(nt_hash, 16, pctxt);

	/* convert ses->userName to unicode and uppercase */
	len = strlen(ses->userName);
	user = kmalloc(2 + (len * 2), GFP_KERNEL);
	if(user == NULL)
		goto calc_exit_2;
	len = cifs_strtoUCS(user, ses->userName, len, nls_cp);
	UniStrupr(user);
	hmac_md5_update((char *)user, 2*len, pctxt);

	/* convert ses->domainName to unicode and uppercase */
	if(ses->domainName) {
		len = strlen(ses->domainName);

        	domain = kmalloc(2 + (len * 2), GFP_KERNEL);
		if(domain == NULL)
			goto calc_exit_1;
		len = cifs_strtoUCS(domain, ses->domainName, len, nls_cp);
		UniStrupr(domain);

		hmac_md5_update((char *)domain, 2*len, pctxt);
	
		kfree(domain);
	}
calc_exit_1:
	kfree(user);
calc_exit_2:
	/* BB FIXME what about bytes 24 through 40 of the signing key? 
	   compare with the NTLM example */
	hmac_md5_final(ses->server->mac_signing_key, pctxt);

	return rc;
}

void setup_ntlmv2_rsp(struct cifsSesInfo * ses, char * resp_buf, 
		      const struct nls_table * nls_cp)
{
	int rc;
	struct ntlmv2_resp * buf = (struct ntlmv2_resp *)resp_buf;

	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;
	buf->names[0].type = cpu_to_le16(NTLMSSP_DOMAIN_TYPE);
	buf->names[0].length = 0;
	buf->names[1].type = 0;
	buf->names[1].length = 0;

	/* calculate buf->ntlmv2_hash */
	rc = calc_ntlmv2_hash(ses, nls_cp);
	if(rc)
		cERROR(1,("could not get v2 hash rc %d",rc));
	CalcNTLMv2_response(ses, resp_buf);
}

void CalcNTLMv2_response(const struct cifsSesInfo * ses, char * v2_session_response)
{
	struct HMACMD5Context context;
	/* rest of v2 struct already generated */
	memcpy(v2_session_response + 8, ses->server->cryptKey,8);
	hmac_md5_init_limK_to_64(ses->server->mac_signing_key, 16, &context);

	hmac_md5_update(v2_session_response+8, 
			sizeof(struct ntlmv2_resp) - 8, &context);

	hmac_md5_final(v2_session_response,&context);
/*	cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); */
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* fs/cifs/cifsencrypt.c
	3	*
12b3b8ff	4	* Copyright (C) International Business Machines Corp., 2005,2006
1da177e4 LT	5	* Author(s): Steve French (sfrench@us.ibm.com)
	6	*
	7	* This library is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU Lesser General Public License as published
	9	* by the Free Software Foundation; either version 2.1 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This library is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	15	* the GNU Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public License
	18	* along with this library; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*/
	21
	22	#include <linux/fs.h>
	23	#include "cifspdu.h"
ffdd6e4d	24	#include "cifsglob.h"
1da177e4 LT	25	#include "cifs_debug.h"
	26	#include "md5.h"
	27	#include "cifs_unicode.h"
	28	#include "cifsproto.h"
7c7b25bc	29	#include <linux/ctype.h>
6d027cfd	30	#include <linux/random.h>
1da177e4	31
ffdd6e4d	32	/* Calculate and return the CIFS signature based on the mac key and SMB PDU */
1da177e4 LT	33	/* the 16 byte signature must be allocated by the caller */
1da177e4 LT	34	/* Note we only use the 1st eight bytes */
ffdd6e4d	35	/* Note that the smb header signature field on input contains the
1da177e4 LT	36	sequence number before this function is called */
	37
	38	extern void mdfour(unsigned char out, unsigned char in, int n);
	39	extern void E_md4hash(const unsigned char passwd, unsigned char p16);
7c7b25bc	40	extern void SMBencrypt(unsigned char passwd, unsigned char c8,
ffdd6e4d	41	unsigned char *p24);
1da177e4	42
ffdd6e4d SF	43	static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu,
ffdd6e4d SF	44	const char key, char signature)
1da177e4 LT	45	{
	46	struct MD5Context context;
	47
ffdd6e4d	48	if ((cifs_pdu == NULL) \|\| (signature == NULL))
1da177e4 LT	49	return -EINVAL;
	50
	51	MD5Init(&context);
ffdd6e4d SF	52	MD5Update(&context, key, CIFS_SESS_KEY_SIZE+16);
	53	MD5Update(&context, cifs_pdu->Protocol, cifs_pdu->smb_buf_length);
	54	MD5Final(signature, &context);
1da177e4 LT	55	return 0;
	56	}
	57
ffdd6e4d SF	58	int cifs_sign_smb(struct smb_hdr cifs_pdu, struct TCP_Server_Info server,
ffdd6e4d SF	59	__u32 *pexpected_response_sequence_number)
1da177e4 LT	60	{
	61	int rc = 0;
	62	char smb_signature[20];
	63
ffdd6e4d	64	if ((cifs_pdu == NULL) \|\| (server == NULL))
1da177e4 LT	65	return -EINVAL;
1da177e4 LT	66
ffdd6e4d	67	if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
1da177e4 LT	68	return rc;
	69
	70	spin_lock(&GlobalMid_Lock);
ffdd6e4d SF	71	cifs_pdu->Signature.Sequence.SequenceNumber =
ffdd6e4d SF	72	cpu_to_le32(server->sequence_number);
1da177e4 LT	73	cifs_pdu->Signature.Sequence.Reserved = 0;
1da177e4 LT	74
ad009ac9 SF	75	*pexpected_response_sequence_number = server->sequence_number++;
ad009ac9 SF	76	server->sequence_number++;
1da177e4 LT	77	spin_unlock(&GlobalMid_Lock);
1da177e4 LT	78
ffdd6e4d SF	79	rc = cifs_calculate_signature(cifs_pdu, server->mac_signing_key,
	80	smb_signature);
	81	if (rc)
1da177e4 LT	82	memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
	83	else
	84	memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
	85
	86	return rc;
	87	}
	88
ffdd6e4d SF	89	static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
ffdd6e4d SF	90	const char key, char signature)
84afc29b	91	{
e9917a00 SF	92	struct MD5Context context;
e9917a00 SF	93	int i;
84afc29b	94
ffdd6e4d	95	if ((iov == NULL) \|\| (signature == NULL))
e9917a00	96	return -EINVAL;
84afc29b	97
e9917a00	98	MD5Init(&context);
ffdd6e4d SF	99	MD5Update(&context, key, CIFS_SESS_KEY_SIZE+16);
	100	for (i=0;i<n_vec;i++) {
	101	if (iov[i].iov_base == NULL) {
	102	cERROR(1 ,("null iovec entry"));
e9917a00	103	return -EIO;
ffdd6e4d	104	} else if (iov[i].iov_len == 0)
e9917a00	105	break; /* bail out if we are sent nothing to sign */
ffdd6e4d	106	/* The first entry includes a length field (which does not get
e9917a00	107	signed that occupies the first 4 bytes before the header */
ffdd6e4d	108	if (i == 0) {
e9917a00 SF	109	if (iov[0].iov_len <= 8 ) /* cmd field at offset 9 */
	110	break; /* nothing to sign or corrupt header */
	111	MD5Update(&context,iov[0].iov_base+4, iov[0].iov_len-4);
	112	} else
ffdd6e4d	113	MD5Update(&context, iov[i].iov_base, iov[i].iov_len);
e9917a00	114	}
84afc29b	115
ffdd6e4d	116	MD5Final(signature, &context);
84afc29b	117
e9917a00	118	return 0;
84afc29b SF	119	}
	120
	121
ffdd6e4d	122	int cifs_sign_smb2(struct kvec iov, int n_vec, struct TCP_Server_Info server,
84afc29b SF	123	__u32 * pexpected_response_sequence_number)
	124	{
	125	int rc = 0;
	126	char smb_signature[20];
ffdd6e4d	127	struct smb_hdr *cifs_pdu = iov[0].iov_base;
84afc29b	128
ffdd6e4d	129	if ((cifs_pdu == NULL) \|\| (server == NULL))
84afc29b SF	130	return -EINVAL;
84afc29b SF	131
ffdd6e4d	132	if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
84afc29b SF	133	return rc;
84afc29b SF	134
ffdd6e4d SF	135	spin_lock(&GlobalMid_Lock);
ffdd6e4d SF	136	cifs_pdu->Signature.Sequence.SequenceNumber =
84afc29b	137	cpu_to_le32(server->sequence_number);
ffdd6e4d	138	cifs_pdu->Signature.Sequence.Reserved = 0;
84afc29b	139
ffdd6e4d SF	140	*pexpected_response_sequence_number = server->sequence_number++;
	141	server->sequence_number++;
	142	spin_unlock(&GlobalMid_Lock);
84afc29b	143
ffdd6e4d	144	rc = cifs_calc_signature2(iov, n_vec, server->mac_signing_key,
84afc29b	145	smb_signature);
ffdd6e4d SF	146	if (rc)
	147	memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
	148	else
	149	memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
84afc29b	150
ffdd6e4d	151	return rc;
84afc29b SF	152	}
84afc29b SF	153
ffdd6e4d SF	154	int cifs_verify_signature(struct smb_hdr cifs_pdu, const char mac_key,
ffdd6e4d SF	155	__u32 expected_sequence_number)
1da177e4 LT	156	{
	157	unsigned int rc;
	158	char server_response_sig[8];
	159	char what_we_think_sig_should_be[20];
	160
ffdd6e4d	161	if ((cifs_pdu == NULL) \|\| (mac_key == NULL))
1da177e4 LT	162	return -EINVAL;
	163
	164	if (cifs_pdu->Command == SMB_COM_NEGOTIATE)
	165	return 0;
	166
	167	if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
ffdd6e4d SF	168	struct smb_com_lock_req * pSMB =
	169	(struct smb_com_lock_req *)cifs_pdu;
	170	if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
1da177e4 LT	171	return 0;
	172	}
	173
	174	/* BB what if signatures are supposed to be on for session but server does not
	175	send one? BB */
	176
	177	/* Do not need to verify session setups with signature "BSRSPYL " */
	178	if(memcmp(cifs_pdu->Signature.SecuritySignature,"BSRSPYL ",8)==0)
	179	cFYI(1,("dummy signature received for smb command 0x%x",cifs_pdu->Command));
	180
	181	/* save off the origiginal signature so we can modify the smb and check
	182	its signature against what the server sent */
	183	memcpy(server_response_sig,cifs_pdu->Signature.SecuritySignature,8);
	184
	185	cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(expected_sequence_number);
	186	cifs_pdu->Signature.Sequence.Reserved = 0;
	187
	188	rc = cifs_calculate_signature(cifs_pdu, mac_key,
	189	what_we_think_sig_should_be);
	190
	191	if(rc)
	192	return rc;
	193
	194
	195	/* cifs_dump_mem("what we think it should be: ",what_we_think_sig_should_be,16); */
	196
	197	if(memcmp(server_response_sig, what_we_think_sig_should_be, 8))
	198	return -EACCES;
	199	else
	200	return 0;
	201
	202	}
	203
	204	/* We fill in key by putting in 40 byte array which was allocated by caller */
	205	int cifs_calculate_mac_key(char * key, const char * rn, const char * password)
	206	{
	207	char temp_key[16];
	208	if ((key == NULL) \|\| (rn == NULL))
	209	return -EINVAL;
	210
	211	E_md4hash(password, temp_key);
	212	mdfour(key,temp_key,16);
7c7b25bc	213	memcpy(key+16,rn, CIFS_SESS_KEY_SIZE);
1da177e4 LT	214	return 0;
	215	}
	216
1717ffc5 SF	217	int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses,
1717ffc5 SF	218	const struct nls_table * nls_info)
1da177e4 LT	219	{
	220	char temp_hash[16];
	221	struct HMACMD5Context ctx;
	222	char * ucase_buf;
e89dc920	223	__le16 * unicode_buf;
1da177e4 LT	224	unsigned int i,user_name_len,dom_name_len;
	225
	226	if(ses == NULL)
	227	return -EINVAL;
	228
	229	E_md4hash(ses->password, temp_hash);
	230
	231	hmac_md5_init_limK_to_64(temp_hash, 16, &ctx);
	232	user_name_len = strlen(ses->userName);
	233	if(user_name_len > MAX_USERNAME_SIZE)
	234	return -EINVAL;
3979877e SF	235	if(ses->domainName == NULL)
3979877e SF	236	return -EINVAL; /* BB should we use CIFS_LINUX_DOM */
1da177e4 LT	237	dom_name_len = strlen(ses->domainName);
	238	if(dom_name_len > MAX_USERNAME_SIZE)
	239	return -EINVAL;
	240
	241	ucase_buf = kmalloc((MAX_USERNAME_SIZE+1), GFP_KERNEL);
	242	if(ucase_buf == NULL)
	243	return -ENOMEM;
	244	unicode_buf = kmalloc((MAX_USERNAME_SIZE+1)*4, GFP_KERNEL);
	245	if(unicode_buf == NULL) {
	246	kfree(ucase_buf);
	247	return -ENOMEM;
	248	}
	249
	250	for(i=0;i<user_name_len;i++)
	251	ucase_buf[i] = nls_info->charset2upper[(int)ses->userName[i]];
	252	ucase_buf[i] = 0;
	253	user_name_len = cifs_strtoUCS(unicode_buf, ucase_buf, MAX_USERNAME_SIZE*2, nls_info);
	254	unicode_buf[user_name_len] = 0;
	255	user_name_len++;
	256
	257	for(i=0;i<dom_name_len;i++)
	258	ucase_buf[i] = nls_info->charset2upper[(int)ses->domainName[i]];
	259	ucase_buf[i] = 0;
	260	dom_name_len = cifs_strtoUCS(unicode_buf+user_name_len, ucase_buf, MAX_USERNAME_SIZE*2, nls_info);
	261
	262	unicode_buf[user_name_len + dom_name_len] = 0;
	263	hmac_md5_update((const unsigned char *) unicode_buf,
	264	(user_name_len+dom_name_len)*2,&ctx);
	265
ad009ac9	266	hmac_md5_final(ses->server->mac_signing_key,&ctx);
1da177e4 LT	267	kfree(ucase_buf);
	268	kfree(unicode_buf);
	269	return 0;
	270	}
7c7b25bc SF	271
	272	#ifdef CONFIG_CIFS_WEAK_PW_HASH
	273	void calc_lanman_hash(struct cifsSesInfo * ses, char * lnm_session_key)
	274	{
	275	int i;
	276	char password_with_pad[CIFS_ENCPWD_SIZE];
	277
bdc4bf6e SF	278	if(ses->server == NULL)
	279	return;
	280
7c7b25bc	281	memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
66abda5e SF	282	if(ses->password)
66abda5e SF	283	strncpy(password_with_pad, ses->password, CIFS_ENCPWD_SIZE);
7c7b25bc	284
bdc4bf6e SF	285	if((ses->server->secMode & SECMODE_PW_ENCRYPT) == 0)
	286	if(extended_security & CIFSSEC_MAY_PLNTXT) {
	287	memcpy(lnm_session_key, password_with_pad, CIFS_ENCPWD_SIZE);
	288	return;
	289	}
	290
7c7b25bc SF	291	/* calculate old style session key */
	292	/* calling toupper is less broken than repeatedly
	293	calling nls_toupper would be since that will never
	294	work for UTF8, but neither handles multibyte code pages
	295	but the only alternative would be converting to UCS-16 (Unicode)
	296	(using a routine something like UniStrupr) then
	297	uppercasing and then converting back from Unicode - which
	298	would only worth doing it if we knew it were utf8. Basically
	299	utf8 and other multibyte codepages each need their own strupper
	300	function since a byte at a time will ont work. */
	301
	302	for(i = 0; i < CIFS_ENCPWD_SIZE; i++) {
	303	password_with_pad[i] = toupper(password_with_pad[i]);
	304	}
	305
	306	SMBencrypt(password_with_pad, ses->server->cryptKey, lnm_session_key);
	307	/* clear password before we return/free memory */
	308	memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
	309	}
	310	#endif /* CIFS_WEAK_PW_HASH */
	311
1717ffc5 SF	312	static int calc_ntlmv2_hash(struct cifsSesInfo *ses,
1717ffc5 SF	313	const struct nls_table * nls_cp)
a8ee0344 SF	314	{
	315	int rc = 0;
	316	int len;
	317	char nt_hash[16];
	318	struct HMACMD5Context * pctxt;
1717ffc5 SF	319	wchar_t * user;
1717ffc5 SF	320	wchar_t * domain;
a8ee0344 SF	321
	322	pctxt = kmalloc(sizeof(struct HMACMD5Context), GFP_KERNEL);
	323
	324	if(pctxt == NULL)
	325	return -ENOMEM;
	326
	327	/* calculate md4 hash of password */
	328	E_md4hash(ses->password, nt_hash);
	329
1717ffc5	330	/* convert Domainname to unicode and uppercase */
a8ee0344 SF	331	hmac_md5_init_limK_to_64(nt_hash, 16, pctxt);
	332
	333	/* convert ses->userName to unicode and uppercase */
1717ffc5 SF	334	len = strlen(ses->userName);
	335	user = kmalloc(2 + (len * 2), GFP_KERNEL);
	336	if(user == NULL)
	337	goto calc_exit_2;
	338	len = cifs_strtoUCS(user, ses->userName, len, nls_cp);
	339	UniStrupr(user);
	340	hmac_md5_update((char )user, 2len, pctxt);
a8ee0344 SF	341
a8ee0344 SF	342	/* convert ses->domainName to unicode and uppercase */
1717ffc5 SF	343	if(ses->domainName) {
1717ffc5 SF	344	len = strlen(ses->domainName);
a8ee0344	345
1717ffc5 SF	346	domain = kmalloc(2 + (len * 2), GFP_KERNEL);
	347	if(domain == NULL)
	348	goto calc_exit_1;
	349	len = cifs_strtoUCS(domain, ses->domainName, len, nls_cp);
	350	UniStrupr(domain);
a8ee0344	351
1717ffc5 SF	352	hmac_md5_update((char )domain, 2len, pctxt);
	353
	354	kfree(domain);
	355	}
	356	calc_exit_1:
	357	kfree(user);
	358	calc_exit_2:
	359	/* BB FIXME what about bytes 24 through 40 of the signing key?
	360	compare with the NTLM example */
	361	hmac_md5_final(ses->server->mac_signing_key, pctxt);
a8ee0344 SF	362
	363	return rc;
	364	}
	365
1717ffc5 SF	366	void setup_ntlmv2_rsp(struct cifsSesInfo * ses, char * resp_buf,
1717ffc5 SF	367	const struct nls_table * nls_cp)
6d027cfd	368	{
a8ee0344	369	int rc;
6d027cfd SF	370	struct ntlmv2_resp * buf = (struct ntlmv2_resp *)resp_buf;
	371
	372	buf->blob_signature = cpu_to_le32(0x00000101);
	373	buf->reserved = 0;
	374	buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
1717ffc5	375	get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
6d027cfd	376	buf->reserved2 = 0;
33ec32fa	377	buf->names[0].type = cpu_to_le16(NTLMSSP_DOMAIN_TYPE);
6d027cfd	378	buf->names[0].length = 0;
33ec32fa SF	379	buf->names[1].type = 0;
33ec32fa SF	380	buf->names[1].length = 0;
a8ee0344	381
6d027cfd	382	/* calculate buf->ntlmv2_hash */
1717ffc5	383	rc = calc_ntlmv2_hash(ses, nls_cp);
a8ee0344 SF	384	if(rc)
a8ee0344 SF	385	cERROR(1,("could not get v2 hash rc %d",rc));
1717ffc5	386	CalcNTLMv2_response(ses, resp_buf);
6d027cfd SF	387	}
6d027cfd SF	388
1717ffc5	389	void CalcNTLMv2_response(const struct cifsSesInfo * ses, char * v2_session_response)
1da177e4 LT	390	{
1da177e4 LT	391	struct HMACMD5Context context;
1717ffc5	392	/* rest of v2 struct already generated */
1da177e4	393	memcpy(v2_session_response + 8, ses->server->cryptKey,8);
ad009ac9	394	hmac_md5_init_limK_to_64(ses->server->mac_signing_key, 16, &context);
1da177e4	395
1717ffc5 SF	396	hmac_md5_update(v2_session_response+8,
1717ffc5 SF	397	sizeof(struct ntlmv2_resp) - 8, &context);
1da177e4 LT	398
1da177e4 LT	399	hmac_md5_final(v2_session_response,&context);
1717ffc5	400	/* cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); */
1da177e4	401	}