[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 <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;
}

#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 && global_secflags & 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,
c8e56f1f	45	const struct mac_key key, char signature)
1da177e4	46	{
c8e56f1f	47	struct MD5Context context;
1da177e4	48
c8e56f1f	49	if ((cifs_pdu == NULL) \|\| (signature == NULL) \|\| (key == NULL))
1da177e4 LT	50	return -EINVAL;
1da177e4 LT	51
c8e56f1f 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
c8e56f1f	56	cifs_MD5_final(signature, &context);
56234e27	57	return 0;
1da177e4 LT	58	}
1da177e4 LT	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
c8e56f1f SF	81	rc = cifs_calculate_signature(cifs_pdu, &server->mac_signing_key,
c8e56f1f SF	82	smb_signature);
ffdd6e4d	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,
c8e56f1f	92	const struct mac_key key, char signature)
84afc29b	93	{
c8e56f1f	94	struct MD5Context context;
e9917a00	95	int i;
84afc29b	96
c8e56f1f	97	if ((iov == NULL) \|\| (signature == NULL) \|\| (key == NULL))
e9917a00	98	return -EINVAL;
84afc29b	99
c8e56f1f SF	100	cifs_MD5_init(&context);
c8e56f1f 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) {
56234e27	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 */
c8e56f1f SF	114	cifs_MD5_update(&context, iov[0].iov_base+4,
c8e56f1f SF	115	iov[0].iov_len-4);
e9917a00	116	} else
c8e56f1f	117	cifs_MD5_update(&context, iov[i].iov_base, iov[i].iov_len);
e9917a00	118	}
84afc29b	119
c8e56f1f	120	cifs_MD5_final(signature, &context);
84afc29b	121
56234e27	122	return 0;
84afc29b SF	123	}
84afc29b SF	124
c8e56f1f	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
c8e56f1f SF	148	rc = cifs_calc_signature2(iov, n_vec, &server->mac_signing_key,
c8e56f1f SF	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	158	int cifs_verify_signature(struct smb_hdr *cifs_pdu,
c8e56f1f	159	const struct mac_key *mac_key,
ffdd6e4d	160	__u32 expected_sequence_number)
1da177e4	161	{
c8e56f1f	162	unsigned int rc;
1da177e4 LT	163	char server_response_sig[8];
	164	char what_we_think_sig_should_be[20];
	165
c8e56f1f	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	183	if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
b6b38f70 JP	184	cFYI(1, "dummy signature received for smb command 0x%x",
b6b38f70 JP	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;
1da177e4 LT	194
c8e56f1f	195	rc = cifs_calculate_signature(cifs_pdu, mac_key,
1da177e4 LT	196	what_we_think_sig_should_be);
1da177e4 LT	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 */
c8e56f1f	212	int cifs_calculate_mac_key(struct mac_key key, const char rn,
b609f06a	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
7c7b25bc	226	#ifdef CONFIG_CIFS_WEAK_PW_HASH
4e53a3fb JL	227	void calc_lanman_hash(const char password, const char cryptkey, bool encrypt,
4e53a3fb JL	228	char *lnm_session_key)
7c7b25bc SF	229	{
	230	int i;
	231	char password_with_pad[CIFS_ENCPWD_SIZE];
	232
	233	memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
4e53a3fb JL	234	if (password)
	235	strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
	236
04912d6a	237	if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
4e53a3fb JL	238	memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE);
	239	memcpy(lnm_session_key, password_with_pad,
	240	CIFS_ENCPWD_SIZE);
	241	return;
	242	}
bdc4bf6e	243
7c7b25bc SF	244	/* calculate old style session key */
	245	/* calling toupper is less broken than repeatedly
	246	calling nls_toupper would be since that will never
	247	work for UTF8, but neither handles multibyte code pages
	248	but the only alternative would be converting to UCS-16 (Unicode)
	249	(using a routine something like UniStrupr) then
	250	uppercasing and then converting back from Unicode - which
	251	would only worth doing it if we knew it were utf8. Basically
	252	utf8 and other multibyte codepages each need their own strupper
	253	function since a byte at a time will ont work. */
	254
ef571cad	255	for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
7c7b25bc	256	password_with_pad[i] = toupper(password_with_pad[i]);
7c7b25bc	257
4e53a3fb JL	258	SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
4e53a3fb JL	259
7c7b25bc SF	260	/* clear password before we return/free memory */
	261	memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
	262	}
	263	#endif /* CIFS_WEAK_PW_HASH */
	264
50c2f753 SF	265	static int calc_ntlmv2_hash(struct cifsSesInfo *ses,
50c2f753 SF	266	const struct nls_table *nls_cp)
a8ee0344 SF	267	{
	268	int rc = 0;
	269	int len;
c8e56f1f SF	270	char nt_hash[16];
c8e56f1f SF	271	struct HMACMD5Context *pctxt;
50c2f753 SF	272	wchar_t *user;
50c2f753 SF	273	wchar_t *domain;
a8ee0344	274
c8e56f1f	275	pctxt = kmalloc(sizeof(struct HMACMD5Context), GFP_KERNEL);
a8ee0344	276
c8e56f1f SF	277	if (pctxt == NULL)
c8e56f1f SF	278	return -ENOMEM;
56234e27	279
c8e56f1f SF	280	/* calculate md4 hash of password */
c8e56f1f SF	281	E_md4hash(ses->password, nt_hash);
9fbc5908	282
c8e56f1f SF	283	/* convert Domainname to unicode and uppercase */
c8e56f1f SF	284	hmac_md5_init_limK_to_64(nt_hash, 16, pctxt);
a8ee0344 SF	285
a8ee0344 SF	286	/* convert ses->userName to unicode and uppercase */
1717ffc5 SF	287	len = strlen(ses->userName);
1717ffc5 SF	288	user = kmalloc(2 + (len * 2), GFP_KERNEL);
56234e27	289	if (user == NULL)
1717ffc5	290	goto calc_exit_2;
8f2376ad	291	len = cifs_strtoUCS((__le16 *)user, ses->userName, len, nls_cp);
1717ffc5	292	UniStrupr(user);
c8e56f1f	293	hmac_md5_update((char )user, 2len, pctxt);
a8ee0344 SF	294
a8ee0344 SF	295	/* convert ses->domainName to unicode and uppercase */
50c2f753	296	if (ses->domainName) {
1717ffc5	297	len = strlen(ses->domainName);
a8ee0344	298
50c2f753	299	domain = kmalloc(2 + (len * 2), GFP_KERNEL);
56234e27	300	if (domain == NULL)
1717ffc5	301	goto calc_exit_1;
8f2376ad CG	302	len = cifs_strtoUCS((__le16 *)domain, ses->domainName, len,
8f2376ad CG	303	nls_cp);
b609f06a SF	304	/* the following line was removed since it didn't work well
	305	with lower cased domain name that passed as an option.
	306	Maybe converting the domain name earlier makes sense */
	307	/* UniStrupr(domain); */
a8ee0344	308
c8e56f1f	309	hmac_md5_update((char )domain, 2len, pctxt);
50c2f753	310
1717ffc5 SF	311	kfree(domain);
	312	}
	313	calc_exit_1:
	314	kfree(user);
	315	calc_exit_2:
50c2f753	316	/* BB FIXME what about bytes 24 through 40 of the signing key?
1717ffc5	317	compare with the NTLM example */
c8e56f1f	318	hmac_md5_final(ses->server->ntlmv2_hash, pctxt);
9fbc5908	319
c8e56f1f	320	kfree(pctxt);
9fbc5908 SF	321	return rc;
	322	}
	323
c8e56f1f	324	void setup_ntlmv2_rsp(struct cifsSesInfo ses, char resp_buf,
9fbc5908 SF	325	const struct nls_table *nls_cp)
9fbc5908 SF	326	{
c8e56f1f	327	int rc;
50c2f753	328	struct ntlmv2_resp buf = (struct ntlmv2_resp )resp_buf;
c8e56f1f	329	struct HMACMD5Context context;
6d027cfd SF	330
	331	buf->blob_signature = cpu_to_le32(0x00000101);
	332	buf->reserved = 0;
	333	buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
1717ffc5	334	get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
6d027cfd	335	buf->reserved2 = 0;
c8e56f1f SF	336	buf->names[0].type = cpu_to_le16(NTLMSSP_DOMAIN_TYPE);
	337	buf->names[0].length = 0;
	338	buf->names[1].type = 0;
	339	buf->names[1].length = 0;
a8ee0344	340
6d027cfd	341	/* calculate buf->ntlmv2_hash */
1717ffc5	342	rc = calc_ntlmv2_hash(ses, nls_cp);
c8e56f1f	343	if (rc)
b6b38f70	344	cERROR(1, "could not get v2 hash rc %d", rc);
c8e56f1f	345	CalcNTLMv2_response(ses, resp_buf);
b609f06a	346
c8e56f1f SF	347	/* now calculate the MAC key for NTLMv2 */
	348	hmac_md5_init_limK_to_64(ses->server->ntlmv2_hash, 16, &context);
	349	hmac_md5_update(resp_buf, 16, &context);
	350	hmac_md5_final(ses->server->mac_signing_key.data.ntlmv2.key, &context);
b609f06a	351
c8e56f1f SF	352	memcpy(&ses->server->mac_signing_key.data.ntlmv2.resp, resp_buf,
	353	sizeof(struct ntlmv2_resp));
	354	ses->server->mac_signing_key.len = 16 + sizeof(struct ntlmv2_resp);
6d027cfd SF	355	}
6d027cfd SF	356
c8e56f1f SF	357	void CalcNTLMv2_response(const struct cifsSesInfo *ses,
c8e56f1f SF	358	char *v2_session_response)
9fbc5908	359	{
c8e56f1f SF	360	struct HMACMD5Context context;
	361	/* rest of v2 struct already generated */
	362	memcpy(v2_session_response + 8, ses->server->cryptKey, 8);
	363	hmac_md5_init_limK_to_64(ses->server->ntlmv2_hash, 16, &context);
9fbc5908	364
c8e56f1f SF	365	hmac_md5_update(v2_session_response+8,
c8e56f1f SF	366	sizeof(struct ntlmv2_resp) - 8, &context);
2d20ca83	367
c8e56f1f SF	368	hmac_md5_final(v2_session_response, &context);
c8e56f1f SF	369	/* cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); */
1da177e4	370	}