[mirror_ubuntu-bionic-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 struct mac_key *key, char *signature)
{
	struct	MD5Context context;

	if ((cifs_pdu == NULL) || (signature == NULL) || (key == NULL))
		return -EINVAL;

	MD5Init(&context);
	MD5Update(&context, (char *)&key->data, key->len);
	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 struct mac_key *key, char *signature)
{
	struct  MD5Context context;
	int i;

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

	MD5Init(&context);
	MD5Update(&context, (char *)&key->data, key->len);
	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 struct mac_key *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(struct mac_key *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->data.ntlm, temp_key, 16);
	memcpy(key->data.ntlm+16, rn, CIFS_SESS_KEY_SIZE);
	key->len = 40;
	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->ntlmv2_hash, &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);
		/* the following line was removed since it didn't work well
		   with lower cased domain name that passed as an option.
		   Maybe converting the domain name earlier makes sense */
		/* 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->ntlmv2_hash, 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;
	struct HMACMD5Context context;

	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);

	/* now calculate the MAC key for NTLMv2 */
	hmac_md5_init_limK_to_64(ses->server->ntlmv2_hash, 16, &context);
	hmac_md5_update(resp_buf, 16, &context);
	hmac_md5_final(ses->server->mac_signing_key.data.ntlmv2.key, &context);

	memcpy(&ses->server->mac_signing_key.data.ntlmv2.resp, resp_buf,
	       sizeof(struct ntlmv2_resp));
	ses->server->mac_signing_key.len = 16 + sizeof(struct ntlmv2_resp);
}

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->ntlmv2_hash, 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	43	static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu,
b609f06a	44	const struct mac_key key, char signature)
1da177e4 LT	45	{
	46	struct MD5Context context;
	47
b609f06a	48	if ((cifs_pdu == NULL) \|\| (signature == NULL) \|\| (key == NULL))
1da177e4 LT	49	return -EINVAL;
	50
	51	MD5Init(&context);
b609f06a	52	MD5Update(&context, (char *)&key->data, key->len);
ffdd6e4d	53	MD5Update(&context, cifs_pdu->Protocol, cifs_pdu->smb_buf_length);
b609f06a	54
ffdd6e4d	55	MD5Final(signature, &context);
1da177e4 LT	56	return 0;
	57	}
	58
ffdd6e4d SF	59	int cifs_sign_smb(struct smb_hdr cifs_pdu, struct TCP_Server_Info server,
ffdd6e4d SF	60	__u32 *pexpected_response_sequence_number)
1da177e4 LT	61	{
	62	int rc = 0;
	63	char smb_signature[20];
	64
ffdd6e4d	65	if ((cifs_pdu == NULL) \|\| (server == NULL))
1da177e4 LT	66	return -EINVAL;
1da177e4 LT	67
ffdd6e4d	68	if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
1da177e4 LT	69	return rc;
	70
	71	spin_lock(&GlobalMid_Lock);
ffdd6e4d SF	72	cifs_pdu->Signature.Sequence.SequenceNumber =
ffdd6e4d SF	73	cpu_to_le32(server->sequence_number);
1da177e4 LT	74	cifs_pdu->Signature.Sequence.Reserved = 0;
1da177e4 LT	75
ad009ac9 SF	76	*pexpected_response_sequence_number = server->sequence_number++;
ad009ac9 SF	77	server->sequence_number++;
1da177e4 LT	78	spin_unlock(&GlobalMid_Lock);
1da177e4 LT	79
b609f06a	80	rc = cifs_calculate_signature(cifs_pdu, &server->mac_signing_key,
ffdd6e4d SF	81	smb_signature);
ffdd6e4d SF	82	if (rc)
1da177e4 LT	83	memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
	84	else
	85	memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
	86
	87	return rc;
	88	}
	89
ffdd6e4d	90	static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
b609f06a	91	const struct mac_key key, char signature)
84afc29b	92	{
e9917a00 SF	93	struct MD5Context context;
e9917a00 SF	94	int i;
84afc29b	95
b609f06a	96	if ((iov == NULL) \|\| (signature == NULL) \|\| (key == NULL))
e9917a00	97	return -EINVAL;
84afc29b	98
e9917a00	99	MD5Init(&context);
b609f06a	100	MD5Update(&context, (char *)&key->data, key->len);
ffdd6e4d SF	101	for (i=0;i<n_vec;i++) {
	102	if (iov[i].iov_base == NULL) {
	103	cERROR(1 ,("null iovec entry"));
e9917a00	104	return -EIO;
ffdd6e4d	105	} else if (iov[i].iov_len == 0)
e9917a00	106	break; /* bail out if we are sent nothing to sign */
ffdd6e4d	107	/* The first entry includes a length field (which does not get
e9917a00	108	signed that occupies the first 4 bytes before the header */
ffdd6e4d	109	if (i == 0) {
e9917a00 SF	110	if (iov[0].iov_len <= 8 ) /* cmd field at offset 9 */
	111	break; /* nothing to sign or corrupt header */
	112	MD5Update(&context,iov[0].iov_base+4, iov[0].iov_len-4);
	113	} else
ffdd6e4d	114	MD5Update(&context, iov[i].iov_base, iov[i].iov_len);
e9917a00	115	}
84afc29b	116
ffdd6e4d	117	MD5Final(signature, &context);
84afc29b	118
e9917a00	119	return 0;
84afc29b SF	120	}
	121
	122
ffdd6e4d	123	int cifs_sign_smb2(struct kvec iov, int n_vec, struct TCP_Server_Info server,
84afc29b SF	124	__u32 * pexpected_response_sequence_number)
	125	{
	126	int rc = 0;
	127	char smb_signature[20];
ffdd6e4d	128	struct smb_hdr *cifs_pdu = iov[0].iov_base;
84afc29b	129
ffdd6e4d	130	if ((cifs_pdu == NULL) \|\| (server == NULL))
84afc29b SF	131	return -EINVAL;
84afc29b SF	132
ffdd6e4d	133	if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
84afc29b SF	134	return rc;
84afc29b SF	135
ffdd6e4d SF	136	spin_lock(&GlobalMid_Lock);
ffdd6e4d SF	137	cifs_pdu->Signature.Sequence.SequenceNumber =
84afc29b	138	cpu_to_le32(server->sequence_number);
ffdd6e4d	139	cifs_pdu->Signature.Sequence.Reserved = 0;
84afc29b	140
ffdd6e4d SF	141	*pexpected_response_sequence_number = server->sequence_number++;
	142	server->sequence_number++;
	143	spin_unlock(&GlobalMid_Lock);
84afc29b	144
b609f06a	145	rc = cifs_calc_signature2(iov, n_vec, &server->mac_signing_key,
84afc29b	146	smb_signature);
ffdd6e4d SF	147	if (rc)
	148	memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
	149	else
	150	memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
84afc29b	151
ffdd6e4d	152	return rc;
84afc29b SF	153	}
84afc29b SF	154
b609f06a SF	155	int cifs_verify_signature(struct smb_hdr *cifs_pdu,
b609f06a SF	156	const struct mac_key *mac_key,
ffdd6e4d	157	__u32 expected_sequence_number)
1da177e4 LT	158	{
	159	unsigned int rc;
	160	char server_response_sig[8];
	161	char what_we_think_sig_should_be[20];
	162
ffdd6e4d	163	if ((cifs_pdu == NULL) \|\| (mac_key == NULL))
1da177e4 LT	164	return -EINVAL;
	165
	166	if (cifs_pdu->Command == SMB_COM_NEGOTIATE)
	167	return 0;
	168
	169	if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
ffdd6e4d SF	170	struct smb_com_lock_req * pSMB =
	171	(struct smb_com_lock_req *)cifs_pdu;
	172	if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
1da177e4 LT	173	return 0;
	174	}
	175
	176	/* BB what if signatures are supposed to be on for session but server does not
	177	send one? BB */
	178
	179	/* Do not need to verify session setups with signature "BSRSPYL " */
	180	if(memcmp(cifs_pdu->Signature.SecuritySignature,"BSRSPYL ",8)==0)
	181	cFYI(1,("dummy signature received for smb command 0x%x",cifs_pdu->Command));
	182
	183	/* save off the origiginal signature so we can modify the smb and check
	184	its signature against what the server sent */
	185	memcpy(server_response_sig,cifs_pdu->Signature.SecuritySignature,8);
	186
	187	cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(expected_sequence_number);
	188	cifs_pdu->Signature.Sequence.Reserved = 0;
	189
	190	rc = cifs_calculate_signature(cifs_pdu, mac_key,
	191	what_we_think_sig_should_be);
	192
	193	if(rc)
	194	return rc;
	195
	196
	197	/* cifs_dump_mem("what we think it should be: ",what_we_think_sig_should_be,16); */
	198
	199	if(memcmp(server_response_sig, what_we_think_sig_should_be, 8))
	200	return -EACCES;
	201	else
	202	return 0;
	203
	204	}
	205
	206	/* We fill in key by putting in 40 byte array which was allocated by caller */
b609f06a SF	207	int cifs_calculate_mac_key(struct mac_key key, const char rn,
b609f06a SF	208	const char *password)
1da177e4 LT	209	{
	210	char temp_key[16];
	211	if ((key == NULL) \|\| (rn == NULL))
	212	return -EINVAL;
	213
	214	E_md4hash(password, temp_key);
b609f06a SF	215	mdfour(key->data.ntlm, temp_key, 16);
	216	memcpy(key->data.ntlm+16, rn, CIFS_SESS_KEY_SIZE);
	217	key->len = 40;
1da177e4 LT	218	return 0;
	219	}
	220
1717ffc5 SF	221	int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses,
1717ffc5 SF	222	const struct nls_table * nls_info)
1da177e4 LT	223	{
	224	char temp_hash[16];
	225	struct HMACMD5Context ctx;
	226	char * ucase_buf;
e89dc920	227	__le16 * unicode_buf;
1da177e4 LT	228	unsigned int i,user_name_len,dom_name_len;
	229
	230	if(ses == NULL)
	231	return -EINVAL;
	232
	233	E_md4hash(ses->password, temp_hash);
	234
	235	hmac_md5_init_limK_to_64(temp_hash, 16, &ctx);
	236	user_name_len = strlen(ses->userName);
	237	if(user_name_len > MAX_USERNAME_SIZE)
	238	return -EINVAL;
3979877e SF	239	if(ses->domainName == NULL)
3979877e SF	240	return -EINVAL; /* BB should we use CIFS_LINUX_DOM */
1da177e4	241	dom_name_len = strlen(ses->domainName);
b609f06a	242	if (dom_name_len > MAX_USERNAME_SIZE)
1da177e4 LT	243	return -EINVAL;
	244
	245	ucase_buf = kmalloc((MAX_USERNAME_SIZE+1), GFP_KERNEL);
b609f06a	246	if (ucase_buf == NULL)
1da177e4 LT	247	return -ENOMEM;
1da177e4 LT	248	unicode_buf = kmalloc((MAX_USERNAME_SIZE+1)*4, GFP_KERNEL);
b609f06a	249	if (unicode_buf == NULL) {
1da177e4 LT	250	kfree(ucase_buf);
	251	return -ENOMEM;
	252	}
	253
b609f06a	254	for (i = 0;i < user_name_len; i++)
1da177e4 LT	255	ucase_buf[i] = nls_info->charset2upper[(int)ses->userName[i]];
	256	ucase_buf[i] = 0;
	257	user_name_len = cifs_strtoUCS(unicode_buf, ucase_buf, MAX_USERNAME_SIZE*2, nls_info);
	258	unicode_buf[user_name_len] = 0;
	259	user_name_len++;
	260
b609f06a	261	for (i = 0; i < dom_name_len; i++)
1da177e4 LT	262	ucase_buf[i] = nls_info->charset2upper[(int)ses->domainName[i]];
	263	ucase_buf[i] = 0;
	264	dom_name_len = cifs_strtoUCS(unicode_buf+user_name_len, ucase_buf, MAX_USERNAME_SIZE*2, nls_info);
	265
	266	unicode_buf[user_name_len + dom_name_len] = 0;
	267	hmac_md5_update((const unsigned char *) unicode_buf,
b609f06a	268	(user_name_len+dom_name_len)*2, &ctx);
1da177e4	269
b609f06a	270	hmac_md5_final(ses->server->ntlmv2_hash, &ctx);
1da177e4 LT	271	kfree(ucase_buf);
	272	kfree(unicode_buf);
	273	return 0;
	274	}
7c7b25bc SF	275
	276	#ifdef CONFIG_CIFS_WEAK_PW_HASH
	277	void calc_lanman_hash(struct cifsSesInfo * ses, char * lnm_session_key)
	278	{
	279	int i;
	280	char password_with_pad[CIFS_ENCPWD_SIZE];
	281
bdc4bf6e SF	282	if(ses->server == NULL)
	283	return;
	284
7c7b25bc	285	memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
66abda5e SF	286	if(ses->password)
66abda5e SF	287	strncpy(password_with_pad, ses->password, CIFS_ENCPWD_SIZE);
7c7b25bc	288
bdc4bf6e SF	289	if((ses->server->secMode & SECMODE_PW_ENCRYPT) == 0)
	290	if(extended_security & CIFSSEC_MAY_PLNTXT) {
	291	memcpy(lnm_session_key, password_with_pad, CIFS_ENCPWD_SIZE);
	292	return;
	293	}
	294
7c7b25bc SF	295	/* calculate old style session key */
	296	/* calling toupper is less broken than repeatedly
	297	calling nls_toupper would be since that will never
	298	work for UTF8, but neither handles multibyte code pages
	299	but the only alternative would be converting to UCS-16 (Unicode)
	300	(using a routine something like UniStrupr) then
	301	uppercasing and then converting back from Unicode - which
	302	would only worth doing it if we knew it were utf8. Basically
	303	utf8 and other multibyte codepages each need their own strupper
	304	function since a byte at a time will ont work. */
	305
	306	for(i = 0; i < CIFS_ENCPWD_SIZE; i++) {
	307	password_with_pad[i] = toupper(password_with_pad[i]);
	308	}
	309
	310	SMBencrypt(password_with_pad, ses->server->cryptKey, lnm_session_key);
	311	/* clear password before we return/free memory */
	312	memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
	313	}
	314	#endif /* CIFS_WEAK_PW_HASH */
	315
1717ffc5 SF	316	static int calc_ntlmv2_hash(struct cifsSesInfo *ses,
1717ffc5 SF	317	const struct nls_table * nls_cp)
a8ee0344 SF	318	{
	319	int rc = 0;
	320	int len;
	321	char nt_hash[16];
	322	struct HMACMD5Context * pctxt;
1717ffc5 SF	323	wchar_t * user;
1717ffc5 SF	324	wchar_t * domain;
a8ee0344 SF	325
	326	pctxt = kmalloc(sizeof(struct HMACMD5Context), GFP_KERNEL);
	327
	328	if(pctxt == NULL)
	329	return -ENOMEM;
	330
	331	/* calculate md4 hash of password */
	332	E_md4hash(ses->password, nt_hash);
	333
1717ffc5	334	/* convert Domainname to unicode and uppercase */
a8ee0344 SF	335	hmac_md5_init_limK_to_64(nt_hash, 16, pctxt);
	336
	337	/* convert ses->userName to unicode and uppercase */
1717ffc5 SF	338	len = strlen(ses->userName);
	339	user = kmalloc(2 + (len * 2), GFP_KERNEL);
	340	if(user == NULL)
	341	goto calc_exit_2;
	342	len = cifs_strtoUCS(user, ses->userName, len, nls_cp);
	343	UniStrupr(user);
	344	hmac_md5_update((char )user, 2len, pctxt);
a8ee0344 SF	345
a8ee0344 SF	346	/* convert ses->domainName to unicode and uppercase */
1717ffc5 SF	347	if(ses->domainName) {
1717ffc5 SF	348	len = strlen(ses->domainName);
a8ee0344	349
1717ffc5 SF	350	domain = kmalloc(2 + (len * 2), GFP_KERNEL);
	351	if(domain == NULL)
	352	goto calc_exit_1;
	353	len = cifs_strtoUCS(domain, ses->domainName, len, nls_cp);
b609f06a SF	354	/* the following line was removed since it didn't work well
	355	with lower cased domain name that passed as an option.
	356	Maybe converting the domain name earlier makes sense */
	357	/* UniStrupr(domain); */
a8ee0344	358
1717ffc5 SF	359	hmac_md5_update((char )domain, 2len, pctxt);
	360
	361	kfree(domain);
	362	}
	363	calc_exit_1:
	364	kfree(user);
	365	calc_exit_2:
	366	/* BB FIXME what about bytes 24 through 40 of the signing key?
	367	compare with the NTLM example */
b609f06a	368	hmac_md5_final(ses->server->ntlmv2_hash, pctxt);
a8ee0344 SF	369
	370	return rc;
	371	}
	372
1717ffc5 SF	373	void setup_ntlmv2_rsp(struct cifsSesInfo * ses, char * resp_buf,
1717ffc5 SF	374	const struct nls_table * nls_cp)
6d027cfd	375	{
a8ee0344	376	int rc;
6d027cfd	377	struct ntlmv2_resp * buf = (struct ntlmv2_resp *)resp_buf;
b609f06a	378	struct HMACMD5Context context;
6d027cfd SF	379
	380	buf->blob_signature = cpu_to_le32(0x00000101);
	381	buf->reserved = 0;
	382	buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
1717ffc5	383	get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
6d027cfd	384	buf->reserved2 = 0;
33ec32fa	385	buf->names[0].type = cpu_to_le16(NTLMSSP_DOMAIN_TYPE);
6d027cfd	386	buf->names[0].length = 0;
33ec32fa SF	387	buf->names[1].type = 0;
33ec32fa SF	388	buf->names[1].length = 0;
a8ee0344	389
6d027cfd	390	/* calculate buf->ntlmv2_hash */
1717ffc5	391	rc = calc_ntlmv2_hash(ses, nls_cp);
a8ee0344 SF	392	if(rc)
a8ee0344 SF	393	cERROR(1,("could not get v2 hash rc %d",rc));
1717ffc5	394	CalcNTLMv2_response(ses, resp_buf);
b609f06a SF	395
	396	/* now calculate the MAC key for NTLMv2 */
	397	hmac_md5_init_limK_to_64(ses->server->ntlmv2_hash, 16, &context);
	398	hmac_md5_update(resp_buf, 16, &context);
	399	hmac_md5_final(ses->server->mac_signing_key.data.ntlmv2.key, &context);
	400
	401	memcpy(&ses->server->mac_signing_key.data.ntlmv2.resp, resp_buf,
	402	sizeof(struct ntlmv2_resp));
	403	ses->server->mac_signing_key.len = 16 + sizeof(struct ntlmv2_resp);
6d027cfd SF	404	}
6d027cfd SF	405
1717ffc5	406	void CalcNTLMv2_response(const struct cifsSesInfo * ses, char * v2_session_response)
1da177e4 LT	407	{
1da177e4 LT	408	struct HMACMD5Context context;
1717ffc5	409	/* rest of v2 struct already generated */
1da177e4	410	memcpy(v2_session_response + 8, ses->server->cryptKey,8);
b609f06a	411	hmac_md5_init_limK_to_64(ses->server->ntlmv2_hash, 16, &context);
1da177e4	412
b609f06a	413	hmac_md5_update(v2_session_response+8,
1717ffc5	414	sizeof(struct ntlmv2_resp) - 8, &context);
1da177e4 LT	415
1da177e4 LT	416	hmac_md5_final(v2_session_response,&context);
1717ffc5	417	/* cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); */
1da177e4	418	}