[net-next-2.6.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 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);
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"
	24	#include "cifsglob.h"
	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 LT	31
	32	/* Calculate and return the CIFS signature based on the mac key and the smb pdu */
	33	/* the 16 byte signature must be allocated by the caller */
	34	/* Note we only use the 1st eight bytes */
	35	/* Note that the smb header signature field on input contains the
	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 SF	40	extern void SMBencrypt(unsigned char passwd, unsigned char c8,
7c7b25bc SF	41	unsigned char *p24);
1da177e4	42
12b3b8ff SF	43	static int cifs_calculate_signature(const struct smb_hdr * cifs_pdu,
12b3b8ff SF	44	const char * key, char * signature)
1da177e4 LT	45	{
	46	struct MD5Context context;
	47
	48	if((cifs_pdu == NULL) \|\| (signature == NULL))
	49	return -EINVAL;
	50
	51	MD5Init(&context);
7c7b25bc	52	MD5Update(&context,key,CIFS_SESS_KEY_SIZE+16);
1da177e4 LT	53	MD5Update(&context,cifs_pdu->Protocol,cifs_pdu->smb_buf_length);
	54	MD5Final(signature,&context);
	55	return 0;
	56	}
	57
ad009ac9	58	int cifs_sign_smb(struct smb_hdr * cifs_pdu, struct TCP_Server_Info * server,
1da177e4 LT	59	__u32 * pexpected_response_sequence_number)
	60	{
	61	int rc = 0;
	62	char smb_signature[20];
	63
ad009ac9	64	if((cifs_pdu == NULL) \|\| (server == NULL))
1da177e4 LT	65	return -EINVAL;
	66
	67	if((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
	68	return rc;
	69
	70	spin_lock(&GlobalMid_Lock);
ad009ac9	71	cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(server->sequence_number);
1da177e4 LT	72	cifs_pdu->Signature.Sequence.Reserved = 0;
1da177e4 LT	73
ad009ac9 SF	74	*pexpected_response_sequence_number = server->sequence_number++;
ad009ac9 SF	75	server->sequence_number++;
1da177e4 LT	76	spin_unlock(&GlobalMid_Lock);
1da177e4 LT	77
ad009ac9	78	rc = cifs_calculate_signature(cifs_pdu, server->mac_signing_key,smb_signature);
1da177e4 LT	79	if(rc)
	80	memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
	81	else
	82	memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
	83
	84	return rc;
	85	}
	86
84afc29b SF	87	static int cifs_calc_signature2(const struct kvec * iov, int n_vec,
	88	const char * key, char * signature)
	89	{
e9917a00 SF	90	struct MD5Context context;
e9917a00 SF	91	int i;
84afc29b	92
e9917a00 SF	93	if((iov == NULL) \|\| (signature == NULL))
e9917a00 SF	94	return -EINVAL;
84afc29b	95
e9917a00	96	MD5Init(&context);
7c7b25bc	97	MD5Update(&context,key,CIFS_SESS_KEY_SIZE+16);
e9917a00 SF	98	for(i=0;i<n_vec;i++) {
	99	if(iov[i].iov_base == NULL) {
	100	cERROR(1,("null iovec entry"));
	101	return -EIO;
	102	} else if(iov[i].iov_len == 0)
	103	break; /* bail out if we are sent nothing to sign */
	104	/* The first entry includes a length field (which does not get
	105	signed that occupies the first 4 bytes before the header */
	106	if(i==0) {
	107	if (iov[0].iov_len <= 8 ) /* cmd field at offset 9 */
	108	break; /* nothing to sign or corrupt header */
	109	MD5Update(&context,iov[0].iov_base+4, iov[0].iov_len-4);
	110	} else
	111	MD5Update(&context,iov[i].iov_base, iov[i].iov_len);
	112	}
84afc29b	113
e9917a00	114	MD5Final(signature,&context);
84afc29b	115
e9917a00	116	return 0;
84afc29b SF	117	}
	118
	119
	120	int cifs_sign_smb2(struct kvec * iov, int n_vec, struct TCP_Server_Info *server,
	121	__u32 * pexpected_response_sequence_number)
	122	{
	123	int rc = 0;
	124	char smb_signature[20];
	125	struct smb_hdr * cifs_pdu = iov[0].iov_base;
	126
	127	if((cifs_pdu == NULL) \|\| (server == NULL))
	128	return -EINVAL;
	129
	130	if((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
	131	return rc;
	132
	133	spin_lock(&GlobalMid_Lock);
	134	cifs_pdu->Signature.Sequence.SequenceNumber =
	135	cpu_to_le32(server->sequence_number);
	136	cifs_pdu->Signature.Sequence.Reserved = 0;
	137
	138	*pexpected_response_sequence_number = server->sequence_number++;
	139	server->sequence_number++;
	140	spin_unlock(&GlobalMid_Lock);
	141
	142	rc = cifs_calc_signature2(iov, n_vec, server->mac_signing_key,
	143	smb_signature);
	144	if(rc)
	145	memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
	146	else
	147	memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
	148
	149	return rc;
	150
	151	}
	152
1da177e4 LT	153	int cifs_verify_signature(struct smb_hdr * cifs_pdu, const char * mac_key,
	154	__u32 expected_sequence_number)
	155	{
	156	unsigned int rc;
	157	char server_response_sig[8];
	158	char what_we_think_sig_should_be[20];
	159
	160	if((cifs_pdu == NULL) \|\| (mac_key == NULL))
	161	return -EINVAL;
	162
	163	if (cifs_pdu->Command == SMB_COM_NEGOTIATE)
	164	return 0;
	165
	166	if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
	167	struct smb_com_lock_req * pSMB = (struct smb_com_lock_req *)cifs_pdu;
	168	if(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
	169	return 0;
	170	}
	171
	172	/* BB what if signatures are supposed to be on for session but server does not
	173	send one? BB */
	174
	175	/* Do not need to verify session setups with signature "BSRSPYL " */
	176	if(memcmp(cifs_pdu->Signature.SecuritySignature,"BSRSPYL ",8)==0)
	177	cFYI(1,("dummy signature received for smb command 0x%x",cifs_pdu->Command));
	178
	179	/* save off the origiginal signature so we can modify the smb and check
	180	its signature against what the server sent */
	181	memcpy(server_response_sig,cifs_pdu->Signature.SecuritySignature,8);
	182
	183	cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(expected_sequence_number);
	184	cifs_pdu->Signature.Sequence.Reserved = 0;
	185
	186	rc = cifs_calculate_signature(cifs_pdu, mac_key,
	187	what_we_think_sig_should_be);
	188
	189	if(rc)
	190	return rc;
	191
	192
	193	/* cifs_dump_mem("what we think it should be: ",what_we_think_sig_should_be,16); */
	194
	195	if(memcmp(server_response_sig, what_we_think_sig_should_be, 8))
	196	return -EACCES;
	197	else
	198	return 0;
	199
	200	}
	201
	202	/* We fill in key by putting in 40 byte array which was allocated by caller */
	203	int cifs_calculate_mac_key(char * key, const char * rn, const char * password)
	204	{
	205	char temp_key[16];
	206	if ((key == NULL) \|\| (rn == NULL))
	207	return -EINVAL;
	208
	209	E_md4hash(password, temp_key);
	210	mdfour(key,temp_key,16);
7c7b25bc	211	memcpy(key+16,rn, CIFS_SESS_KEY_SIZE);
1da177e4 LT	212	return 0;
	213	}
	214
1717ffc5 SF	215	int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses,
1717ffc5 SF	216	const struct nls_table * nls_info)
1da177e4 LT	217	{
	218	char temp_hash[16];
	219	struct HMACMD5Context ctx;
	220	char * ucase_buf;
e89dc920	221	__le16 * unicode_buf;
1da177e4 LT	222	unsigned int i,user_name_len,dom_name_len;
	223
	224	if(ses == NULL)
	225	return -EINVAL;
	226
	227	E_md4hash(ses->password, temp_hash);
	228
	229	hmac_md5_init_limK_to_64(temp_hash, 16, &ctx);
	230	user_name_len = strlen(ses->userName);
	231	if(user_name_len > MAX_USERNAME_SIZE)
	232	return -EINVAL;
3979877e SF	233	if(ses->domainName == NULL)
3979877e SF	234	return -EINVAL; /* BB should we use CIFS_LINUX_DOM */
1da177e4 LT	235	dom_name_len = strlen(ses->domainName);
	236	if(dom_name_len > MAX_USERNAME_SIZE)
	237	return -EINVAL;
	238
	239	ucase_buf = kmalloc((MAX_USERNAME_SIZE+1), GFP_KERNEL);
	240	if(ucase_buf == NULL)
	241	return -ENOMEM;
	242	unicode_buf = kmalloc((MAX_USERNAME_SIZE+1)*4, GFP_KERNEL);
	243	if(unicode_buf == NULL) {
	244	kfree(ucase_buf);
	245	return -ENOMEM;
	246	}
	247
	248	for(i=0;i<user_name_len;i++)
	249	ucase_buf[i] = nls_info->charset2upper[(int)ses->userName[i]];
	250	ucase_buf[i] = 0;
	251	user_name_len = cifs_strtoUCS(unicode_buf, ucase_buf, MAX_USERNAME_SIZE*2, nls_info);
	252	unicode_buf[user_name_len] = 0;
	253	user_name_len++;
	254
	255	for(i=0;i<dom_name_len;i++)
	256	ucase_buf[i] = nls_info->charset2upper[(int)ses->domainName[i]];
	257	ucase_buf[i] = 0;
	258	dom_name_len = cifs_strtoUCS(unicode_buf+user_name_len, ucase_buf, MAX_USERNAME_SIZE*2, nls_info);
	259
	260	unicode_buf[user_name_len + dom_name_len] = 0;
	261	hmac_md5_update((const unsigned char *) unicode_buf,
	262	(user_name_len+dom_name_len)*2,&ctx);
	263
ad009ac9	264	hmac_md5_final(ses->server->mac_signing_key,&ctx);
1da177e4 LT	265	kfree(ucase_buf);
	266	kfree(unicode_buf);
	267	return 0;
	268	}
7c7b25bc SF	269
	270	#ifdef CONFIG_CIFS_WEAK_PW_HASH
	271	void calc_lanman_hash(struct cifsSesInfo * ses, char * lnm_session_key)
	272	{
	273	int i;
	274	char password_with_pad[CIFS_ENCPWD_SIZE];
	275
bdc4bf6e SF	276	if(ses->server == NULL)
	277	return;
	278
7c7b25bc	279	memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
66abda5e SF	280	if(ses->password)
66abda5e SF	281	strncpy(password_with_pad, ses->password, CIFS_ENCPWD_SIZE);
7c7b25bc	282
bdc4bf6e SF	283	if((ses->server->secMode & SECMODE_PW_ENCRYPT) == 0)
	284	if(extended_security & CIFSSEC_MAY_PLNTXT) {
	285	memcpy(lnm_session_key, password_with_pad, CIFS_ENCPWD_SIZE);
	286	return;
	287	}
	288
7c7b25bc SF	289	/* calculate old style session key */
	290	/* calling toupper is less broken than repeatedly
	291	calling nls_toupper would be since that will never
	292	work for UTF8, but neither handles multibyte code pages
	293	but the only alternative would be converting to UCS-16 (Unicode)
	294	(using a routine something like UniStrupr) then
	295	uppercasing and then converting back from Unicode - which
	296	would only worth doing it if we knew it were utf8. Basically
	297	utf8 and other multibyte codepages each need their own strupper
	298	function since a byte at a time will ont work. */
	299
	300	for(i = 0; i < CIFS_ENCPWD_SIZE; i++) {
	301	password_with_pad[i] = toupper(password_with_pad[i]);
	302	}
	303
	304	SMBencrypt(password_with_pad, ses->server->cryptKey, lnm_session_key);
	305	/* clear password before we return/free memory */
	306	memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
	307	}
	308	#endif /* CIFS_WEAK_PW_HASH */
	309
1717ffc5 SF	310	static int calc_ntlmv2_hash(struct cifsSesInfo *ses,
1717ffc5 SF	311	const struct nls_table * nls_cp)
a8ee0344 SF	312	{
	313	int rc = 0;
	314	int len;
	315	char nt_hash[16];
	316	struct HMACMD5Context * pctxt;
1717ffc5 SF	317	wchar_t * user;
1717ffc5 SF	318	wchar_t * domain;
a8ee0344 SF	319
	320	pctxt = kmalloc(sizeof(struct HMACMD5Context), GFP_KERNEL);
	321
	322	if(pctxt == NULL)
	323	return -ENOMEM;
	324
	325	/* calculate md4 hash of password */
	326	E_md4hash(ses->password, nt_hash);
	327
1717ffc5	328	/* convert Domainname to unicode and uppercase */
a8ee0344 SF	329	hmac_md5_init_limK_to_64(nt_hash, 16, pctxt);
	330
	331	/* convert ses->userName to unicode and uppercase */
1717ffc5 SF	332	len = strlen(ses->userName);
	333	user = kmalloc(2 + (len * 2), GFP_KERNEL);
	334	if(user == NULL)
	335	goto calc_exit_2;
	336	len = cifs_strtoUCS(user, ses->userName, len, nls_cp);
	337	UniStrupr(user);
	338	hmac_md5_update((char )user, 2len, pctxt);
a8ee0344 SF	339
a8ee0344 SF	340	/* convert ses->domainName to unicode and uppercase */
1717ffc5 SF	341	if(ses->domainName) {
1717ffc5 SF	342	len = strlen(ses->domainName);
a8ee0344	343
1717ffc5 SF	344	domain = kmalloc(2 + (len * 2), GFP_KERNEL);
	345	if(domain == NULL)
	346	goto calc_exit_1;
	347	len = cifs_strtoUCS(domain, ses->domainName, len, nls_cp);
	348	UniStrupr(domain);
a8ee0344	349
1717ffc5 SF	350	hmac_md5_update((char )domain, 2len, pctxt);
	351
	352	kfree(domain);
	353	}
	354	calc_exit_1:
	355	kfree(user);
	356	calc_exit_2:
	357	/* BB FIXME what about bytes 24 through 40 of the signing key?
	358	compare with the NTLM example */
	359	hmac_md5_final(ses->server->mac_signing_key, pctxt);
a8ee0344 SF	360
	361	return rc;
	362	}
	363
1717ffc5 SF	364	void setup_ntlmv2_rsp(struct cifsSesInfo * ses, char * resp_buf,
1717ffc5 SF	365	const struct nls_table * nls_cp)
6d027cfd	366	{
a8ee0344	367	int rc;
6d027cfd SF	368	struct ntlmv2_resp * buf = (struct ntlmv2_resp *)resp_buf;
	369
	370	buf->blob_signature = cpu_to_le32(0x00000101);
	371	buf->reserved = 0;
	372	buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
1717ffc5	373	get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
6d027cfd	374	buf->reserved2 = 0;
33ec32fa	375	buf->names[0].type = cpu_to_le16(NTLMSSP_DOMAIN_TYPE);
6d027cfd	376	buf->names[0].length = 0;
33ec32fa SF	377	buf->names[1].type = 0;
33ec32fa SF	378	buf->names[1].length = 0;
a8ee0344	379
6d027cfd	380	/* calculate buf->ntlmv2_hash */
1717ffc5	381	rc = calc_ntlmv2_hash(ses, nls_cp);
a8ee0344 SF	382	if(rc)
a8ee0344 SF	383	cERROR(1,("could not get v2 hash rc %d",rc));
1717ffc5	384	CalcNTLMv2_response(ses, resp_buf);
6d027cfd SF	385	}
6d027cfd SF	386
1717ffc5	387	void CalcNTLMv2_response(const struct cifsSesInfo * ses, char * v2_session_response)
1da177e4 LT	388	{
1da177e4 LT	389	struct HMACMD5Context context;
1717ffc5	390	/* rest of v2 struct already generated */
1da177e4	391	memcpy(v2_session_response + 8, ses->server->cryptKey,8);
ad009ac9	392	hmac_md5_init_limK_to_64(ses->server->mac_signing_key, 16, &context);
1da177e4	393
1717ffc5 SF	394	hmac_md5_update(v2_session_response+8,
1717ffc5 SF	395	sizeof(struct ntlmv2_resp) - 8, &context);
1da177e4 LT	396
1da177e4 LT	397	hmac_md5_final(v2_session_response,&context);
1717ffc5	398	/* cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); */
1da177e4	399	}