[mirror_ubuntu-zesty-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, 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;

	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_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 */
			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(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);

	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);
4e53a3fb	40	extern void SMBencrypt(unsigned char passwd, const unsigned char c8,
ffdd6e4d	41	unsigned char *p24);
50c2f753	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);
50c2f753 SF	72	cifs_pdu->Signature.Sequence.SequenceNumber =
50c2f753 SF	73	cpu_to_le32(server->sequence_number);
1da177e4	74	cifs_pdu->Signature.Sequence.Reserved = 0;
50c2f753	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);
50c2f753	101	for (i = 0; i < n_vec; i++) {
745542e2 JL	102	if (iov[i].iov_len == 0)
745542e2 JL	103	continue;
ffdd6e4d	104	if (iov[i].iov_base == NULL) {
50c2f753	105	cERROR(1, ("null iovec entry"));
e9917a00	106	return -EIO;
745542e2	107	}
ffdd6e4d	108	/* The first entry includes a length field (which does not get
e9917a00	109	signed that occupies the first 4 bytes before the header */
ffdd6e4d	110	if (i == 0) {
63d2583f	111	if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
e9917a00	112	break; /* nothing to sign or corrupt header */
63135e08 SF	113	MD5Update(&context, iov[0].iov_base+4,
63135e08 SF	114	iov[0].iov_len-4);
e9917a00	115	} else
ffdd6e4d	116	MD5Update(&context, iov[i].iov_base, iov[i].iov_len);
e9917a00	117	}
84afc29b	118
ffdd6e4d	119	MD5Final(signature, &context);
84afc29b	120
e9917a00	121	return 0;
84afc29b SF	122	}
	123
	124
ffdd6e4d	125	int cifs_sign_smb2(struct kvec iov, int n_vec, struct TCP_Server_Info server,
63d2583f	126	__u32 *pexpected_response_sequence_number)
84afc29b SF	127	{
	128	int rc = 0;
	129	char smb_signature[20];
ffdd6e4d	130	struct smb_hdr *cifs_pdu = iov[0].iov_base;
84afc29b	131
ffdd6e4d	132	if ((cifs_pdu == NULL) \|\| (server == NULL))
84afc29b SF	133	return -EINVAL;
84afc29b SF	134
ffdd6e4d	135	if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
84afc29b SF	136	return rc;
84afc29b SF	137
ffdd6e4d SF	138	spin_lock(&GlobalMid_Lock);
ffdd6e4d SF	139	cifs_pdu->Signature.Sequence.SequenceNumber =
84afc29b	140	cpu_to_le32(server->sequence_number);
ffdd6e4d	141	cifs_pdu->Signature.Sequence.Reserved = 0;
84afc29b	142
ffdd6e4d SF	143	*pexpected_response_sequence_number = server->sequence_number++;
	144	server->sequence_number++;
	145	spin_unlock(&GlobalMid_Lock);
84afc29b	146
b609f06a	147	rc = cifs_calc_signature2(iov, n_vec, &server->mac_signing_key,
84afc29b	148	smb_signature);
ffdd6e4d SF	149	if (rc)
	150	memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
	151	else
	152	memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
84afc29b	153
ffdd6e4d	154	return rc;
84afc29b SF	155	}
84afc29b SF	156
b609f06a SF	157	int cifs_verify_signature(struct smb_hdr *cifs_pdu,
b609f06a SF	158	const struct mac_key *mac_key,
ffdd6e4d	159	__u32 expected_sequence_number)
1da177e4 LT	160	{
	161	unsigned int rc;
	162	char server_response_sig[8];
	163	char what_we_think_sig_should_be[20];
	164
ffdd6e4d	165	if ((cifs_pdu == NULL) \|\| (mac_key == NULL))
1da177e4 LT	166	return -EINVAL;
	167
	168	if (cifs_pdu->Command == SMB_COM_NEGOTIATE)
	169	return 0;
	170
	171	if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
50c2f753	172	struct smb_com_lock_req *pSMB =
ffdd6e4d SF	173	(struct smb_com_lock_req *)cifs_pdu;
ffdd6e4d SF	174	if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
1da177e4 LT	175	return 0;
	176	}
	177
50c2f753 SF	178	/* BB what if signatures are supposed to be on for session but
	179	server does not send one? BB */
	180
1da177e4	181	/* Do not need to verify session setups with signature "BSRSPYL " */
50c2f753 SF	182	if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
	183	cFYI(1, ("dummy signature received for smb command 0x%x",
	184	cifs_pdu->Command));
1da177e4 LT	185
	186	/* save off the origiginal signature so we can modify the smb and check
	187	its signature against what the server sent */
50c2f753	188	memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
1da177e4	189
50c2f753 SF	190	cifs_pdu->Signature.Sequence.SequenceNumber =
50c2f753 SF	191	cpu_to_le32(expected_sequence_number);
1da177e4 LT	192	cifs_pdu->Signature.Sequence.Reserved = 0;
	193
	194	rc = cifs_calculate_signature(cifs_pdu, mac_key,
	195	what_we_think_sig_should_be);
	196
50c2f753	197	if (rc)
1da177e4 LT	198	return rc;
1da177e4 LT	199
50c2f753 SF	200	/* cifs_dump_mem("what we think it should be: ",
50c2f753 SF	201	what_we_think_sig_should_be, 16); */
1da177e4	202
50c2f753	203	if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
1da177e4 LT	204	return -EACCES;
	205	else
	206	return 0;
	207
	208	}
	209
	210	/* We fill in key by putting in 40 byte array which was allocated by caller */
b609f06a SF	211	int cifs_calculate_mac_key(struct mac_key key, const char rn,
b609f06a SF	212	const char *password)
1da177e4 LT	213	{
	214	char temp_key[16];
	215	if ((key == NULL) \|\| (rn == NULL))
	216	return -EINVAL;
	217
	218	E_md4hash(password, temp_key);
b609f06a SF	219	mdfour(key->data.ntlm, temp_key, 16);
	220	memcpy(key->data.ntlm+16, rn, CIFS_SESS_KEY_SIZE);
	221	key->len = 40;
1da177e4 LT	222	return 0;
	223	}
	224
50c2f753 SF	225	int CalcNTLMv2_partial_mac_key(struct cifsSesInfo *ses,
50c2f753 SF	226	const struct nls_table *nls_info)
1da177e4 LT	227	{
	228	char temp_hash[16];
	229	struct HMACMD5Context ctx;
50c2f753 SF	230	char *ucase_buf;
	231	__le16 *unicode_buf;
	232	unsigned int i, user_name_len, dom_name_len;
1da177e4	233
50c2f753	234	if (ses == NULL)
1da177e4 LT	235	return -EINVAL;
	236
	237	E_md4hash(ses->password, temp_hash);
	238
	239	hmac_md5_init_limK_to_64(temp_hash, 16, &ctx);
	240	user_name_len = strlen(ses->userName);
50c2f753	241	if (user_name_len > MAX_USERNAME_SIZE)
1da177e4	242	return -EINVAL;
50c2f753	243	if (ses->domainName == NULL)
3979877e	244	return -EINVAL; /* BB should we use CIFS_LINUX_DOM */
1da177e4	245	dom_name_len = strlen(ses->domainName);
b609f06a	246	if (dom_name_len > MAX_USERNAME_SIZE)
1da177e4	247	return -EINVAL;
50c2f753	248
1da177e4	249	ucase_buf = kmalloc((MAX_USERNAME_SIZE+1), GFP_KERNEL);
b609f06a	250	if (ucase_buf == NULL)
1da177e4 LT	251	return -ENOMEM;
1da177e4 LT	252	unicode_buf = kmalloc((MAX_USERNAME_SIZE+1)*4, GFP_KERNEL);
b609f06a	253	if (unicode_buf == NULL) {
1da177e4 LT	254	kfree(ucase_buf);
	255	return -ENOMEM;
	256	}
50c2f753 SF	257
50c2f753 SF	258	for (i = 0; i < user_name_len; i++)
1da177e4 LT	259	ucase_buf[i] = nls_info->charset2upper[(int)ses->userName[i]];
1da177e4 LT	260	ucase_buf[i] = 0;
50c2f753 SF	261	user_name_len = cifs_strtoUCS(unicode_buf, ucase_buf,
50c2f753 SF	262	MAX_USERNAME_SIZE*2, nls_info);
1da177e4 LT	263	unicode_buf[user_name_len] = 0;
	264	user_name_len++;
	265
b609f06a	266	for (i = 0; i < dom_name_len; i++)
1da177e4 LT	267	ucase_buf[i] = nls_info->charset2upper[(int)ses->domainName[i]];
1da177e4 LT	268	ucase_buf[i] = 0;
50c2f753 SF	269	dom_name_len = cifs_strtoUCS(unicode_buf+user_name_len, ucase_buf,
50c2f753 SF	270	MAX_USERNAME_SIZE*2, nls_info);
1da177e4 LT	271
	272	unicode_buf[user_name_len + dom_name_len] = 0;
	273	hmac_md5_update((const unsigned char *) unicode_buf,
b609f06a	274	(user_name_len+dom_name_len)*2, &ctx);
1da177e4	275
b609f06a	276	hmac_md5_final(ses->server->ntlmv2_hash, &ctx);
1da177e4 LT	277	kfree(ucase_buf);
	278	kfree(unicode_buf);
	279	return 0;
	280	}
7c7b25bc SF	281
7c7b25bc SF	282	#ifdef CONFIG_CIFS_WEAK_PW_HASH
4e53a3fb JL	283	void calc_lanman_hash(const char password, const char cryptkey, bool encrypt,
4e53a3fb JL	284	char *lnm_session_key)
7c7b25bc SF	285	{
	286	int i;
	287	char password_with_pad[CIFS_ENCPWD_SIZE];
	288
	289	memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
4e53a3fb JL	290	if (password)
	291	strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
	292
	293	if (!encrypt && extended_security & CIFSSEC_MAY_PLNTXT) {
	294	memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE);
	295	memcpy(lnm_session_key, password_with_pad,
	296	CIFS_ENCPWD_SIZE);
	297	return;
	298	}
bdc4bf6e	299
7c7b25bc SF	300	/* calculate old style session key */
	301	/* calling toupper is less broken than repeatedly
	302	calling nls_toupper would be since that will never
	303	work for UTF8, but neither handles multibyte code pages
	304	but the only alternative would be converting to UCS-16 (Unicode)
	305	(using a routine something like UniStrupr) then
	306	uppercasing and then converting back from Unicode - which
	307	would only worth doing it if we knew it were utf8. Basically
	308	utf8 and other multibyte codepages each need their own strupper
	309	function since a byte at a time will ont work. */
	310
ef571cad	311	for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
7c7b25bc	312	password_with_pad[i] = toupper(password_with_pad[i]);
7c7b25bc	313
4e53a3fb JL	314	SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
4e53a3fb JL	315
7c7b25bc SF	316	/* clear password before we return/free memory */
	317	memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
	318	}
	319	#endif /* CIFS_WEAK_PW_HASH */
	320
50c2f753 SF	321	static int calc_ntlmv2_hash(struct cifsSesInfo *ses,
50c2f753 SF	322	const struct nls_table *nls_cp)
a8ee0344 SF	323	{
	324	int rc = 0;
	325	int len;
	326	char nt_hash[16];
50c2f753 SF	327	struct HMACMD5Context *pctxt;
	328	wchar_t *user;
	329	wchar_t *domain;
a8ee0344 SF	330
	331	pctxt = kmalloc(sizeof(struct HMACMD5Context), GFP_KERNEL);
	332
50c2f753	333	if (pctxt == NULL)
a8ee0344 SF	334	return -ENOMEM;
	335
	336	/* calculate md4 hash of password */
	337	E_md4hash(ses->password, nt_hash);
	338
1717ffc5	339	/* convert Domainname to unicode and uppercase */
a8ee0344 SF	340	hmac_md5_init_limK_to_64(nt_hash, 16, pctxt);
	341
	342	/* convert ses->userName to unicode and uppercase */
1717ffc5 SF	343	len = strlen(ses->userName);
1717ffc5 SF	344	user = kmalloc(2 + (len * 2), GFP_KERNEL);
50c2f753	345	if (user == NULL)
1717ffc5	346	goto calc_exit_2;
8f2376ad	347	len = cifs_strtoUCS((__le16 *)user, ses->userName, len, nls_cp);
1717ffc5 SF	348	UniStrupr(user);
1717ffc5 SF	349	hmac_md5_update((char )user, 2len, pctxt);
a8ee0344 SF	350
a8ee0344 SF	351	/* convert ses->domainName to unicode and uppercase */
50c2f753	352	if (ses->domainName) {
1717ffc5	353	len = strlen(ses->domainName);
a8ee0344	354
50c2f753 SF	355	domain = kmalloc(2 + (len * 2), GFP_KERNEL);
50c2f753 SF	356	if (domain == NULL)
1717ffc5	357	goto calc_exit_1;
8f2376ad CG	358	len = cifs_strtoUCS((__le16 *)domain, ses->domainName, len,
8f2376ad CG	359	nls_cp);
b609f06a SF	360	/* the following line was removed since it didn't work well
	361	with lower cased domain name that passed as an option.
	362	Maybe converting the domain name earlier makes sense */
	363	/* UniStrupr(domain); */
a8ee0344	364
1717ffc5	365	hmac_md5_update((char )domain, 2len, pctxt);
50c2f753	366
1717ffc5 SF	367	kfree(domain);
	368	}
	369	calc_exit_1:
	370	kfree(user);
	371	calc_exit_2:
50c2f753	372	/* BB FIXME what about bytes 24 through 40 of the signing key?
1717ffc5	373	compare with the NTLM example */
b609f06a	374	hmac_md5_final(ses->server->ntlmv2_hash, pctxt);
a8ee0344 SF	375
	376	return rc;
	377	}
	378
50c2f753 SF	379	void setup_ntlmv2_rsp(struct cifsSesInfo ses, char resp_buf,
50c2f753 SF	380	const struct nls_table *nls_cp)
6d027cfd	381	{
a8ee0344	382	int rc;
50c2f753	383	struct ntlmv2_resp buf = (struct ntlmv2_resp )resp_buf;
b609f06a	384	struct HMACMD5Context context;
6d027cfd SF	385
	386	buf->blob_signature = cpu_to_le32(0x00000101);
	387	buf->reserved = 0;
	388	buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
1717ffc5	389	get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
6d027cfd	390	buf->reserved2 = 0;
33ec32fa	391	buf->names[0].type = cpu_to_le16(NTLMSSP_DOMAIN_TYPE);
6d027cfd	392	buf->names[0].length = 0;
33ec32fa SF	393	buf->names[1].type = 0;
33ec32fa SF	394	buf->names[1].length = 0;
a8ee0344	395
6d027cfd	396	/* calculate buf->ntlmv2_hash */
1717ffc5	397	rc = calc_ntlmv2_hash(ses, nls_cp);
50c2f753 SF	398	if (rc)
50c2f753 SF	399	cERROR(1, ("could not get v2 hash rc %d", rc));
1717ffc5	400	CalcNTLMv2_response(ses, resp_buf);
b609f06a SF	401
	402	/* now calculate the MAC key for NTLMv2 */
	403	hmac_md5_init_limK_to_64(ses->server->ntlmv2_hash, 16, &context);
	404	hmac_md5_update(resp_buf, 16, &context);
	405	hmac_md5_final(ses->server->mac_signing_key.data.ntlmv2.key, &context);
	406
	407	memcpy(&ses->server->mac_signing_key.data.ntlmv2.resp, resp_buf,
	408	sizeof(struct ntlmv2_resp));
	409	ses->server->mac_signing_key.len = 16 + sizeof(struct ntlmv2_resp);
6d027cfd SF	410	}
6d027cfd SF	411
50c2f753 SF	412	void CalcNTLMv2_response(const struct cifsSesInfo *ses,
50c2f753 SF	413	char *v2_session_response)
1da177e4 LT	414	{
1da177e4 LT	415	struct HMACMD5Context context;
1717ffc5	416	/* rest of v2 struct already generated */
50c2f753	417	memcpy(v2_session_response + 8, ses->server->cryptKey, 8);
b609f06a	418	hmac_md5_init_limK_to_64(ses->server->ntlmv2_hash, 16, &context);
1da177e4	419
b609f06a	420	hmac_md5_update(v2_session_response+8,
1717ffc5	421	sizeof(struct ntlmv2_resp) - 8, &context);
1da177e4	422
50c2f753	423	hmac_md5_final(v2_session_response, &context);
1717ffc5	424	/* cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); */
1da177e4	425	}