[GitHub/mt8127/android_kernel_alcatel_ttab.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 <linux/slab.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, const 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;

	cifs_MD5_init(&context);
	cifs_MD5_update(&context, (char *)&key->data, key->len);
	cifs_MD5_update(&context, cifs_pdu->Protocol, cifs_pdu->smb_buf_length);

	cifs_MD5_final(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;

	cifs_MD5_init(&context);
	cifs_MD5_update(&context, (char *)&key->data, 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 */
			cifs_MD5_update(&context, iov[0].iov_base+4,
				  iov[0].iov_len-4);
		} else
			cifs_MD5_update(&context, iov[i].iov_base, iov[i].iov_len);
	}

	cifs_MD5_final(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(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 && extended_security & 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 */

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((__le16 *)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((__le16 *)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);

	kfree(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>
5a0e3ad6	23	#include <linux/slab.h>
1da177e4	24	#include "cifspdu.h"
ffdd6e4d	25	#include "cifsglob.h"
1da177e4 LT	26	#include "cifs_debug.h"
	27	#include "md5.h"
	28	#include "cifs_unicode.h"
	29	#include "cifsproto.h"
7c7b25bc	30	#include <linux/ctype.h>
6d027cfd	31	#include <linux/random.h>
1da177e4	32
ffdd6e4d	33	/* Calculate and return the CIFS signature based on the mac key and SMB PDU */
1da177e4 LT	34	/* the 16 byte signature must be allocated by the caller */
1da177e4 LT	35	/* Note we only use the 1st eight bytes */
ffdd6e4d	36	/* Note that the smb header signature field on input contains the
1da177e4 LT	37	sequence number before this function is called */
	38
	39	extern void mdfour(unsigned char out, unsigned char in, int n);
	40	extern void E_md4hash(const unsigned char passwd, unsigned char p16);
4e53a3fb	41	extern void SMBencrypt(unsigned char passwd, const unsigned char c8,
ffdd6e4d	42	unsigned char *p24);
50c2f753	43
ffdd6e4d	44	static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu,
b609f06a	45	const struct mac_key key, char signature)
1da177e4 LT	46	{
	47	struct MD5Context context;
	48
b609f06a	49	if ((cifs_pdu == NULL) \|\| (signature == NULL) \|\| (key == NULL))
1da177e4 LT	50	return -EINVAL;
1da177e4 LT	51
6a7f8d36 SF	52	cifs_MD5_init(&context);
	53	cifs_MD5_update(&context, (char *)&key->data, key->len);
	54	cifs_MD5_update(&context, cifs_pdu->Protocol, cifs_pdu->smb_buf_length);
b609f06a	55
6a7f8d36	56	cifs_MD5_final(signature, &context);
1da177e4 LT	57	return 0;
	58	}
	59
ffdd6e4d SF	60	int cifs_sign_smb(struct smb_hdr cifs_pdu, struct TCP_Server_Info server,
ffdd6e4d SF	61	__u32 *pexpected_response_sequence_number)
1da177e4 LT	62	{
	63	int rc = 0;
	64	char smb_signature[20];
	65
ffdd6e4d	66	if ((cifs_pdu == NULL) \|\| (server == NULL))
1da177e4 LT	67	return -EINVAL;
1da177e4 LT	68
ffdd6e4d	69	if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
1da177e4 LT	70	return rc;
	71
	72	spin_lock(&GlobalMid_Lock);
50c2f753 SF	73	cifs_pdu->Signature.Sequence.SequenceNumber =
50c2f753 SF	74	cpu_to_le32(server->sequence_number);
1da177e4	75	cifs_pdu->Signature.Sequence.Reserved = 0;
50c2f753	76
ad009ac9 SF	77	*pexpected_response_sequence_number = server->sequence_number++;
ad009ac9 SF	78	server->sequence_number++;
1da177e4 LT	79	spin_unlock(&GlobalMid_Lock);
1da177e4 LT	80
b609f06a	81	rc = cifs_calculate_signature(cifs_pdu, &server->mac_signing_key,
ffdd6e4d SF	82	smb_signature);
ffdd6e4d SF	83	if (rc)
1da177e4 LT	84	memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
	85	else
	86	memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
	87
	88	return rc;
	89	}
	90
ffdd6e4d	91	static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
b609f06a	92	const struct mac_key key, char signature)
84afc29b	93	{
e9917a00 SF	94	struct MD5Context context;
e9917a00 SF	95	int i;
84afc29b	96
b609f06a	97	if ((iov == NULL) \|\| (signature == NULL) \|\| (key == NULL))
e9917a00	98	return -EINVAL;
84afc29b	99
6a7f8d36 SF	100	cifs_MD5_init(&context);
6a7f8d36 SF	101	cifs_MD5_update(&context, (char *)&key->data, key->len);
50c2f753	102	for (i = 0; i < n_vec; i++) {
745542e2 JL	103	if (iov[i].iov_len == 0)
745542e2 JL	104	continue;
ffdd6e4d	105	if (iov[i].iov_base == NULL) {
50c2f753	106	cERROR(1, ("null iovec entry"));
e9917a00	107	return -EIO;
745542e2	108	}
ffdd6e4d	109	/* The first entry includes a length field (which does not get
e9917a00	110	signed that occupies the first 4 bytes before the header */
ffdd6e4d	111	if (i == 0) {
63d2583f	112	if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
e9917a00	113	break; /* nothing to sign or corrupt header */
6a7f8d36	114	cifs_MD5_update(&context, iov[0].iov_base+4,
63135e08	115	iov[0].iov_len-4);
e9917a00	116	} else
6a7f8d36	117	cifs_MD5_update(&context, iov[i].iov_base, iov[i].iov_len);
e9917a00	118	}
84afc29b	119
6a7f8d36	120	cifs_MD5_final(signature, &context);
84afc29b	121
e9917a00	122	return 0;
84afc29b SF	123	}
	124
	125
ffdd6e4d	126	int cifs_sign_smb2(struct kvec iov, int n_vec, struct TCP_Server_Info server,
63d2583f	127	__u32 *pexpected_response_sequence_number)
84afc29b SF	128	{
	129	int rc = 0;
	130	char smb_signature[20];
ffdd6e4d	131	struct smb_hdr *cifs_pdu = iov[0].iov_base;
84afc29b	132
ffdd6e4d	133	if ((cifs_pdu == NULL) \|\| (server == NULL))
84afc29b SF	134	return -EINVAL;
84afc29b SF	135
ffdd6e4d	136	if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
84afc29b SF	137	return rc;
84afc29b SF	138
ffdd6e4d SF	139	spin_lock(&GlobalMid_Lock);
ffdd6e4d SF	140	cifs_pdu->Signature.Sequence.SequenceNumber =
84afc29b	141	cpu_to_le32(server->sequence_number);
ffdd6e4d	142	cifs_pdu->Signature.Sequence.Reserved = 0;
84afc29b	143
ffdd6e4d SF	144	*pexpected_response_sequence_number = server->sequence_number++;
	145	server->sequence_number++;
	146	spin_unlock(&GlobalMid_Lock);
84afc29b	147
b609f06a	148	rc = cifs_calc_signature2(iov, n_vec, &server->mac_signing_key,
84afc29b	149	smb_signature);
ffdd6e4d SF	150	if (rc)
	151	memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
	152	else
	153	memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
84afc29b	154
ffdd6e4d	155	return rc;
84afc29b SF	156	}
84afc29b SF	157
b609f06a SF	158	int cifs_verify_signature(struct smb_hdr *cifs_pdu,
b609f06a SF	159	const struct mac_key *mac_key,
ffdd6e4d	160	__u32 expected_sequence_number)
1da177e4 LT	161	{
	162	unsigned int rc;
	163	char server_response_sig[8];
	164	char what_we_think_sig_should_be[20];
	165
ffdd6e4d	166	if ((cifs_pdu == NULL) \|\| (mac_key == NULL))
1da177e4 LT	167	return -EINVAL;
	168
	169	if (cifs_pdu->Command == SMB_COM_NEGOTIATE)
	170	return 0;
	171
	172	if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
50c2f753	173	struct smb_com_lock_req *pSMB =
ffdd6e4d SF	174	(struct smb_com_lock_req *)cifs_pdu;
ffdd6e4d SF	175	if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
1da177e4 LT	176	return 0;
	177	}
	178
50c2f753 SF	179	/* BB what if signatures are supposed to be on for session but
	180	server does not send one? BB */
	181
1da177e4	182	/* Do not need to verify session setups with signature "BSRSPYL " */
50c2f753 SF	183	if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
	184	cFYI(1, ("dummy signature received for smb command 0x%x",
	185	cifs_pdu->Command));
1da177e4 LT	186
	187	/* save off the origiginal signature so we can modify the smb and check
	188	its signature against what the server sent */
50c2f753	189	memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
1da177e4	190
50c2f753 SF	191	cifs_pdu->Signature.Sequence.SequenceNumber =
50c2f753 SF	192	cpu_to_le32(expected_sequence_number);
1da177e4 LT	193	cifs_pdu->Signature.Sequence.Reserved = 0;
	194
	195	rc = cifs_calculate_signature(cifs_pdu, mac_key,
	196	what_we_think_sig_should_be);
	197
50c2f753	198	if (rc)
1da177e4 LT	199	return rc;
1da177e4 LT	200
50c2f753 SF	201	/* cifs_dump_mem("what we think it should be: ",
50c2f753 SF	202	what_we_think_sig_should_be, 16); */
1da177e4	203
50c2f753	204	if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
1da177e4 LT	205	return -EACCES;
	206	else
	207	return 0;
	208
	209	}
	210
	211	/* We fill in key by putting in 40 byte array which was allocated by caller */
b609f06a SF	212	int cifs_calculate_mac_key(struct mac_key key, const char rn,
b609f06a SF	213	const char *password)
1da177e4 LT	214	{
	215	char temp_key[16];
	216	if ((key == NULL) \|\| (rn == NULL))
	217	return -EINVAL;
	218
	219	E_md4hash(password, temp_key);
b609f06a SF	220	mdfour(key->data.ntlm, temp_key, 16);
	221	memcpy(key->data.ntlm+16, rn, CIFS_SESS_KEY_SIZE);
	222	key->len = 40;
1da177e4 LT	223	return 0;
	224	}
	225
50c2f753 SF	226	int CalcNTLMv2_partial_mac_key(struct cifsSesInfo *ses,
50c2f753 SF	227	const struct nls_table *nls_info)
1da177e4 LT	228	{
	229	char temp_hash[16];
	230	struct HMACMD5Context ctx;
50c2f753 SF	231	char *ucase_buf;
	232	__le16 *unicode_buf;
	233	unsigned int i, user_name_len, dom_name_len;
1da177e4	234
50c2f753	235	if (ses == NULL)
1da177e4 LT	236	return -EINVAL;
	237
	238	E_md4hash(ses->password, temp_hash);
	239
	240	hmac_md5_init_limK_to_64(temp_hash, 16, &ctx);
	241	user_name_len = strlen(ses->userName);
50c2f753	242	if (user_name_len > MAX_USERNAME_SIZE)
1da177e4	243	return -EINVAL;
50c2f753	244	if (ses->domainName == NULL)
3979877e	245	return -EINVAL; /* BB should we use CIFS_LINUX_DOM */
1da177e4	246	dom_name_len = strlen(ses->domainName);
b609f06a	247	if (dom_name_len > MAX_USERNAME_SIZE)
1da177e4	248	return -EINVAL;
50c2f753	249
1da177e4	250	ucase_buf = kmalloc((MAX_USERNAME_SIZE+1), GFP_KERNEL);
b609f06a	251	if (ucase_buf == NULL)
1da177e4 LT	252	return -ENOMEM;
1da177e4 LT	253	unicode_buf = kmalloc((MAX_USERNAME_SIZE+1)*4, GFP_KERNEL);
b609f06a	254	if (unicode_buf == NULL) {
1da177e4 LT	255	kfree(ucase_buf);
	256	return -ENOMEM;
	257	}
50c2f753 SF	258
50c2f753 SF	259	for (i = 0; i < user_name_len; i++)
1da177e4 LT	260	ucase_buf[i] = nls_info->charset2upper[(int)ses->userName[i]];
1da177e4 LT	261	ucase_buf[i] = 0;
50c2f753 SF	262	user_name_len = cifs_strtoUCS(unicode_buf, ucase_buf,
50c2f753 SF	263	MAX_USERNAME_SIZE*2, nls_info);
1da177e4 LT	264	unicode_buf[user_name_len] = 0;
	265	user_name_len++;
	266
b609f06a	267	for (i = 0; i < dom_name_len; i++)
1da177e4 LT	268	ucase_buf[i] = nls_info->charset2upper[(int)ses->domainName[i]];
1da177e4 LT	269	ucase_buf[i] = 0;
50c2f753 SF	270	dom_name_len = cifs_strtoUCS(unicode_buf+user_name_len, ucase_buf,
50c2f753 SF	271	MAX_USERNAME_SIZE*2, nls_info);
1da177e4 LT	272
	273	unicode_buf[user_name_len + dom_name_len] = 0;
	274	hmac_md5_update((const unsigned char *) unicode_buf,
b609f06a	275	(user_name_len+dom_name_len)*2, &ctx);
1da177e4	276
b609f06a	277	hmac_md5_final(ses->server->ntlmv2_hash, &ctx);
1da177e4 LT	278	kfree(ucase_buf);
	279	kfree(unicode_buf);
	280	return 0;
	281	}
7c7b25bc SF	282
7c7b25bc SF	283	#ifdef CONFIG_CIFS_WEAK_PW_HASH
4e53a3fb JL	284	void calc_lanman_hash(const char password, const char cryptkey, bool encrypt,
4e53a3fb JL	285	char *lnm_session_key)
7c7b25bc SF	286	{
	287	int i;
	288	char password_with_pad[CIFS_ENCPWD_SIZE];
	289
	290	memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
4e53a3fb JL	291	if (password)
	292	strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
	293
	294	if (!encrypt && extended_security & CIFSSEC_MAY_PLNTXT) {
	295	memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE);
	296	memcpy(lnm_session_key, password_with_pad,
	297	CIFS_ENCPWD_SIZE);
	298	return;
	299	}
bdc4bf6e	300
7c7b25bc SF	301	/* calculate old style session key */
	302	/* calling toupper is less broken than repeatedly
	303	calling nls_toupper would be since that will never
	304	work for UTF8, but neither handles multibyte code pages
	305	but the only alternative would be converting to UCS-16 (Unicode)
	306	(using a routine something like UniStrupr) then
	307	uppercasing and then converting back from Unicode - which
	308	would only worth doing it if we knew it were utf8. Basically
	309	utf8 and other multibyte codepages each need their own strupper
	310	function since a byte at a time will ont work. */
	311
ef571cad	312	for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
7c7b25bc	313	password_with_pad[i] = toupper(password_with_pad[i]);
7c7b25bc	314
4e53a3fb JL	315	SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
4e53a3fb JL	316
7c7b25bc SF	317	/* clear password before we return/free memory */
	318	memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
	319	}
	320	#endif /* CIFS_WEAK_PW_HASH */
	321
50c2f753 SF	322	static int calc_ntlmv2_hash(struct cifsSesInfo *ses,
50c2f753 SF	323	const struct nls_table *nls_cp)
a8ee0344 SF	324	{
	325	int rc = 0;
	326	int len;
	327	char nt_hash[16];
50c2f753 SF	328	struct HMACMD5Context *pctxt;
	329	wchar_t *user;
	330	wchar_t *domain;
a8ee0344 SF	331
	332	pctxt = kmalloc(sizeof(struct HMACMD5Context), GFP_KERNEL);
	333
50c2f753	334	if (pctxt == NULL)
a8ee0344 SF	335	return -ENOMEM;
	336
	337	/* calculate md4 hash of password */
	338	E_md4hash(ses->password, nt_hash);
	339
1717ffc5	340	/* convert Domainname to unicode and uppercase */
a8ee0344 SF	341	hmac_md5_init_limK_to_64(nt_hash, 16, pctxt);
	342
	343	/* convert ses->userName to unicode and uppercase */
1717ffc5 SF	344	len = strlen(ses->userName);
1717ffc5 SF	345	user = kmalloc(2 + (len * 2), GFP_KERNEL);
50c2f753	346	if (user == NULL)
1717ffc5	347	goto calc_exit_2;
8f2376ad	348	len = cifs_strtoUCS((__le16 *)user, ses->userName, len, nls_cp);
1717ffc5 SF	349	UniStrupr(user);
1717ffc5 SF	350	hmac_md5_update((char )user, 2len, pctxt);
a8ee0344 SF	351
a8ee0344 SF	352	/* convert ses->domainName to unicode and uppercase */
50c2f753	353	if (ses->domainName) {
1717ffc5	354	len = strlen(ses->domainName);
a8ee0344	355
50c2f753 SF	356	domain = kmalloc(2 + (len * 2), GFP_KERNEL);
50c2f753 SF	357	if (domain == NULL)
1717ffc5	358	goto calc_exit_1;
8f2376ad CG	359	len = cifs_strtoUCS((__le16 *)domain, ses->domainName, len,
8f2376ad CG	360	nls_cp);
b609f06a SF	361	/* the following line was removed since it didn't work well
	362	with lower cased domain name that passed as an option.
	363	Maybe converting the domain name earlier makes sense */
	364	/* UniStrupr(domain); */
a8ee0344	365
1717ffc5	366	hmac_md5_update((char )domain, 2len, pctxt);
50c2f753	367
1717ffc5 SF	368	kfree(domain);
	369	}
	370	calc_exit_1:
	371	kfree(user);
	372	calc_exit_2:
50c2f753	373	/* BB FIXME what about bytes 24 through 40 of the signing key?
1717ffc5	374	compare with the NTLM example */
b609f06a	375	hmac_md5_final(ses->server->ntlmv2_hash, pctxt);
a8ee0344	376
1b3859bc	377	kfree(pctxt);
a8ee0344 SF	378	return rc;
	379	}
	380
50c2f753 SF	381	void setup_ntlmv2_rsp(struct cifsSesInfo ses, char resp_buf,
50c2f753 SF	382	const struct nls_table *nls_cp)
6d027cfd	383	{
a8ee0344	384	int rc;
50c2f753	385	struct ntlmv2_resp buf = (struct ntlmv2_resp )resp_buf;
b609f06a	386	struct HMACMD5Context context;
6d027cfd SF	387
	388	buf->blob_signature = cpu_to_le32(0x00000101);
	389	buf->reserved = 0;
	390	buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
1717ffc5	391	get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
6d027cfd	392	buf->reserved2 = 0;
33ec32fa	393	buf->names[0].type = cpu_to_le16(NTLMSSP_DOMAIN_TYPE);
6d027cfd	394	buf->names[0].length = 0;
33ec32fa SF	395	buf->names[1].type = 0;
33ec32fa SF	396	buf->names[1].length = 0;
a8ee0344	397
6d027cfd	398	/* calculate buf->ntlmv2_hash */
1717ffc5	399	rc = calc_ntlmv2_hash(ses, nls_cp);
50c2f753 SF	400	if (rc)
50c2f753 SF	401	cERROR(1, ("could not get v2 hash rc %d", rc));
1717ffc5	402	CalcNTLMv2_response(ses, resp_buf);
b609f06a SF	403
	404	/* now calculate the MAC key for NTLMv2 */
	405	hmac_md5_init_limK_to_64(ses->server->ntlmv2_hash, 16, &context);
	406	hmac_md5_update(resp_buf, 16, &context);
	407	hmac_md5_final(ses->server->mac_signing_key.data.ntlmv2.key, &context);
	408
	409	memcpy(&ses->server->mac_signing_key.data.ntlmv2.resp, resp_buf,
	410	sizeof(struct ntlmv2_resp));
	411	ses->server->mac_signing_key.len = 16 + sizeof(struct ntlmv2_resp);
6d027cfd SF	412	}
6d027cfd SF	413
50c2f753 SF	414	void CalcNTLMv2_response(const struct cifsSesInfo *ses,
50c2f753 SF	415	char *v2_session_response)
1da177e4 LT	416	{
1da177e4 LT	417	struct HMACMD5Context context;
1717ffc5	418	/* rest of v2 struct already generated */
50c2f753	419	memcpy(v2_session_response + 8, ses->server->cryptKey, 8);
b609f06a	420	hmac_md5_init_limK_to_64(ses->server->ntlmv2_hash, 16, &context);
1da177e4	421
b609f06a	422	hmac_md5_update(v2_session_response+8,
1717ffc5	423	sizeof(struct ntlmv2_resp) - 8, &context);
1da177e4	424
50c2f753	425	hmac_md5_final(v2_session_response, &context);
1717ffc5	426	/* cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); */
1da177e4	427	}