Initial import

1 files changed, 1442 insertions, 0 deletions

diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
new file mode 100644
index 000000000..bce6fdcd5
--- /dev/null
+++ b/fs/cifs/sess.c
@@ -0,0 +1,1442 @@
+/*
+ *   fs/cifs/sess.c
+ *
+ *   SMB/CIFS session setup handling routines
+ *
+ *   Copyright (c) International Business Machines  Corp., 2006, 2009
+ *   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 "cifspdu.h"
+#include "cifsglob.h"
+#include "cifsproto.h"
+#include "cifs_unicode.h"
+#include "cifs_debug.h"
+#include "ntlmssp.h"
+#include "nterr.h"
+#include <linux/utsname.h>
+#include <linux/slab.h>
+#include "cifs_spnego.h"
+
+static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, SESSION_SETUP_ANDX *pSMB)
+{
+	__u32 capabilities = 0;
+
+	/* init fields common to all four types of SessSetup */
+	/* Note that offsets for first seven fields in req struct are same  */
+	/*	in CIFS Specs so does not matter which of 3 forms of struct */
+	/*	that we use in next few lines                               */
+	/* Note that header is initialized to zero in header_assemble */
+	pSMB->req.AndXCommand = 0xFF;
+	pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32,
+					CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4,
+					USHRT_MAX));
+	pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
+	pSMB->req.VcNumber = cpu_to_le16(1);
+
+	/* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
+
+	/* BB verify whether signing required on neg or just on auth frame
+	   (and NTLM case) */
+
+	capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
+			CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
+
+	if (ses->server->sign)
+		pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
+
+	if (ses->capabilities & CAP_UNICODE) {
+		pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
+		capabilities |= CAP_UNICODE;
+	}
+	if (ses->capabilities & CAP_STATUS32) {
+		pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
+		capabilities |= CAP_STATUS32;
+	}
+	if (ses->capabilities & CAP_DFS) {
+		pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
+		capabilities |= CAP_DFS;
+	}
+	if (ses->capabilities & CAP_UNIX)
+		capabilities |= CAP_UNIX;
+
+	return capabilities;
+}
+
+static void
+unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
+{
+	char *bcc_ptr = *pbcc_area;
+	int bytes_ret = 0;
+
+	/* Copy OS version */
+	bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,
+				    nls_cp);
+	bcc_ptr += 2 * bytes_ret;
+	bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,
+				    32, nls_cp);
+	bcc_ptr += 2 * bytes_ret;
+	bcc_ptr += 2; /* trailing null */
+
+	bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
+				    32, nls_cp);
+	bcc_ptr += 2 * bytes_ret;
+	bcc_ptr += 2; /* trailing null */
+
+	*pbcc_area = bcc_ptr;
+}
+
+static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
+				   const struct nls_table *nls_cp)
+{
+	char *bcc_ptr = *pbcc_area;
+	int bytes_ret = 0;
+
+	/* copy domain */
+	if (ses->domainName == NULL) {
+		/* Sending null domain better than using a bogus domain name (as
+		we did briefly in 2.6.18) since server will use its default */
+		*bcc_ptr = 0;
+		*(bcc_ptr+1) = 0;
+		bytes_ret = 0;
+	} else
+		bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName,
+					    CIFS_MAX_DOMAINNAME_LEN, nls_cp);
+	bcc_ptr += 2 * bytes_ret;
+	bcc_ptr += 2;  /* account for null terminator */
+
+	*pbcc_area = bcc_ptr;
+}
+
+
+static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
+				   const struct nls_table *nls_cp)
+{
+	char *bcc_ptr = *pbcc_area;
+	int bytes_ret = 0;
+
+	/* BB FIXME add check that strings total less
+	than 335 or will need to send them as arrays */
+
+	/* unicode strings, must be word aligned before the call */
+/*	if ((long) bcc_ptr % 2)	{
+		*bcc_ptr = 0;
+		bcc_ptr++;
+	} */
+	/* copy user */
+	if (ses->user_name == NULL) {
+		/* null user mount */
+		*bcc_ptr = 0;
+		*(bcc_ptr+1) = 0;
+	} else {
+		bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
+					    CIFS_MAX_USERNAME_LEN, nls_cp);
+	}
+	bcc_ptr += 2 * bytes_ret;
+	bcc_ptr += 2; /* account for null termination */
+
+	unicode_domain_string(&bcc_ptr, ses, nls_cp);
+	unicode_oslm_strings(&bcc_ptr, nls_cp);
+
+	*pbcc_area = bcc_ptr;
+}
+
+static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
+				 const struct nls_table *nls_cp)
+{
+	char *bcc_ptr = *pbcc_area;
+
+	/* copy user */
+	/* BB what about null user mounts - check that we do this BB */
+	/* copy user */
+	if (ses->user_name != NULL) {
+		strncpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);
+		bcc_ptr += strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
+	}
+	/* else null user mount */
+	*bcc_ptr = 0;
+	bcc_ptr++; /* account for null termination */
+
+	/* copy domain */
+	if (ses->domainName != NULL) {
+		strncpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
+		bcc_ptr += strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
+	} /* else we will send a null domain name
+	     so the server will default to its own domain */
+	*bcc_ptr = 0;
+	bcc_ptr++;
+
+	/* BB check for overflow here */
+
+	strcpy(bcc_ptr, "Linux version ");
+	bcc_ptr += strlen("Linux version ");
+	strcpy(bcc_ptr, init_utsname()->release);
+	bcc_ptr += strlen(init_utsname()->release) + 1;
+
+	strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
+	bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
+
+	*pbcc_area = bcc_ptr;
+}
+
+static void
+decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
+		      const struct nls_table *nls_cp)
+{
+	int len;
+	char *data = *pbcc_area;
+
+	cifs_dbg(FYI, "bleft %d\n", bleft);
+
+	kfree(ses->serverOS);
+	ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
+	cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);
+	len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
+	data += len;
+	bleft -= len;
+	if (bleft <= 0)
+		return;
+
+	kfree(ses->serverNOS);
+	ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
+	cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);
+	len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
+	data += len;
+	bleft -= len;
+	if (bleft <= 0)
+		return;
+
+	kfree(ses->serverDomain);
+	ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
+	cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);
+
+	return;
+}
+
+static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
+				struct cifs_ses *ses,
+				const struct nls_table *nls_cp)
+{
+	int len;
+	char *bcc_ptr = *pbcc_area;
+
+	cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);
+
+	len = strnlen(bcc_ptr, bleft);
+	if (len >= bleft)
+		return;
+
+	kfree(ses->serverOS);
+
+	ses->serverOS = kzalloc(len + 1, GFP_KERNEL);
+	if (ses->serverOS) {
+		strncpy(ses->serverOS, bcc_ptr, len);
+		if (strncmp(ses->serverOS, "OS/2", 4) == 0)
+			cifs_dbg(FYI, "OS/2 server\n");
+	}
+
+	bcc_ptr += len + 1;
+	bleft -= len + 1;
+
+	len = strnlen(bcc_ptr, bleft);
+	if (len >= bleft)
+		return;
+
+	kfree(ses->serverNOS);
+
+	ses->serverNOS = kzalloc(len + 1, GFP_KERNEL);
+	if (ses->serverNOS)
+		strncpy(ses->serverNOS, bcc_ptr, len);
+
+	bcc_ptr += len + 1;
+	bleft -= len + 1;
+
+	len = strnlen(bcc_ptr, bleft);
+	if (len > bleft)
+		return;
+
+	/* No domain field in LANMAN case. Domain is
+	   returned by old servers in the SMB negprot response */
+	/* BB For newer servers which do not support Unicode,
+	   but thus do return domain here we could add parsing
+	   for it later, but it is not very important */
+	cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
+}
+
+int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
+				    struct cifs_ses *ses)
+{
+	unsigned int tioffset; /* challenge message target info area */
+	unsigned int tilen; /* challenge message target info area length  */
+
+	CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
+
+	if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
+		cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
+		return -EINVAL;
+	}
+
+	if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
+		cifs_dbg(VFS, "blob signature incorrect %s\n",
+			 pblob->Signature);
+		return -EINVAL;
+	}
+	if (pblob->MessageType != NtLmChallenge) {
+		cifs_dbg(VFS, "Incorrect message type %d\n",
+			 pblob->MessageType);
+		return -EINVAL;
+	}
+
+	memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
+	/* BB we could decode pblob->NegotiateFlags; some may be useful */
+	/* In particular we can examine sign flags */
+	/* BB spec says that if AvId field of MsvAvTimestamp is populated then
+		we must set the MIC field of the AUTHENTICATE_MESSAGE */
+	ses->ntlmssp->server_flags = le32_to_cpu(pblob->NegotiateFlags);
+	tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
+	tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
+	if (tioffset > blob_len || tioffset + tilen > blob_len) {
+		cifs_dbg(VFS, "tioffset + tilen too high %u + %u",
+			tioffset, tilen);
+		return -EINVAL;
+	}
+	if (tilen) {
+		ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
+						 GFP_KERNEL);
+		if (!ses->auth_key.response) {
+			cifs_dbg(VFS, "Challenge target info alloc failure");
+			return -ENOMEM;
+		}
+		ses->auth_key.len = tilen;
+	}
+
+	return 0;
+}
+
+/* BB Move to ntlmssp.c eventually */
+
+/* We do not malloc the blob, it is passed in pbuffer, because
+   it is fixed size, and small, making this approach cleaner */
+void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
+					 struct cifs_ses *ses)
+{
+	NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer;
+	__u32 flags;
+
+	memset(pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
+	memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
+	sec_blob->MessageType = NtLmNegotiate;
+
+	/* BB is NTLMV2 session security format easier to use here? */
+	flags = NTLMSSP_NEGOTIATE_56 |	NTLMSSP_REQUEST_TARGET |
+		NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
+		NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC;
+	if (ses->server->sign) {
+		flags |= NTLMSSP_NEGOTIATE_SIGN;
+		if (!ses->server->session_estab ||
+				ses->ntlmssp->sesskey_per_smbsess)
+			flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
+	}
+
+	sec_blob->NegotiateFlags = cpu_to_le32(flags);
+
+	sec_blob->WorkstationName.BufferOffset = 0;
+	sec_blob->WorkstationName.Length = 0;
+	sec_blob->WorkstationName.MaximumLength = 0;
+
+	/* Domain name is sent on the Challenge not Negotiate NTLMSSP request */
+	sec_blob->DomainName.BufferOffset = 0;
+	sec_blob->DomainName.Length = 0;
+	sec_blob->DomainName.MaximumLength = 0;
+}
+
+/* We do not malloc the blob, it is passed in pbuffer, because its
+   maximum possible size is fixed and small, making this approach cleaner.
+   This function returns the length of the data in the blob */
+int build_ntlmssp_auth_blob(unsigned char *pbuffer,
+					u16 *buflen,
+				   struct cifs_ses *ses,
+				   const struct nls_table *nls_cp)
+{
+	int rc;
+	AUTHENTICATE_MESSAGE *sec_blob = (AUTHENTICATE_MESSAGE *)pbuffer;
+	__u32 flags;
+	unsigned char *tmp;
+
+	memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
+	sec_blob->MessageType = NtLmAuthenticate;
+
+	flags = NTLMSSP_NEGOTIATE_56 |
+		NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
+		NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
+		NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC;
+	if (ses->server->sign) {
+		flags |= NTLMSSP_NEGOTIATE_SIGN;
+		if (!ses->server->session_estab ||
+				ses->ntlmssp->sesskey_per_smbsess)
+			flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
+	}
+
+	tmp = pbuffer + sizeof(AUTHENTICATE_MESSAGE);
+	sec_blob->NegotiateFlags = cpu_to_le32(flags);
+
+	sec_blob->LmChallengeResponse.BufferOffset =
+				cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
+	sec_blob->LmChallengeResponse.Length = 0;
+	sec_blob->LmChallengeResponse.MaximumLength = 0;
+
+	sec_blob->NtChallengeResponse.BufferOffset = cpu_to_le32(tmp - pbuffer);
+	rc = setup_ntlmv2_rsp(ses, nls_cp);
+	if (rc) {
+		cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
+		goto setup_ntlmv2_ret;
+	}
+	memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
+			ses->auth_key.len - CIFS_SESS_KEY_SIZE);
+	tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
+
+	sec_blob->NtChallengeResponse.Length =
+			cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
+	sec_blob->NtChallengeResponse.MaximumLength =
+			cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
+
+	if (ses->domainName == NULL) {
+		sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
+		sec_blob->DomainName.Length = 0;
+		sec_blob->DomainName.MaximumLength = 0;
+		tmp += 2;
+	} else {
+		int len;
+		len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName,
+				      CIFS_MAX_USERNAME_LEN, nls_cp);
+		len *= 2; /* unicode is 2 bytes each */
+		sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
+		sec_blob->DomainName.Length = cpu_to_le16(len);
+		sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
+		tmp += len;
+	}
+
+	if (ses->user_name == NULL) {
+		sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
+		sec_blob->UserName.Length = 0;
+		sec_blob->UserName.MaximumLength = 0;
+		tmp += 2;
+	} else {
+		int len;
+		len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name,
+				      CIFS_MAX_USERNAME_LEN, nls_cp);
+		len *= 2; /* unicode is 2 bytes each */
+		sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
+		sec_blob->UserName.Length = cpu_to_le16(len);
+		sec_blob->UserName.MaximumLength = cpu_to_le16(len);
+		tmp += len;
+	}
+
+	sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - pbuffer);
+	sec_blob->WorkstationName.Length = 0;
+	sec_blob->WorkstationName.MaximumLength = 0;
+	tmp += 2;
+
+	if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) ||
+		(ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
+			&& !calc_seckey(ses)) {
+		memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
+		sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
+		sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
+		sec_blob->SessionKey.MaximumLength =
+				cpu_to_le16(CIFS_CPHTXT_SIZE);
+		tmp += CIFS_CPHTXT_SIZE;
+	} else {
+		sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
+		sec_blob->SessionKey.Length = 0;
+		sec_blob->SessionKey.MaximumLength = 0;
+	}
+
+setup_ntlmv2_ret:
+	*buflen = tmp - pbuffer;
+	return rc;
+}
+
+enum securityEnum
+select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
+{
+	switch (server->negflavor) {
+	case CIFS_NEGFLAVOR_EXTENDED:
+		switch (requested) {
+		case Kerberos:
+		case RawNTLMSSP:
+			return requested;
+		case Unspecified:
+			if (server->sec_ntlmssp &&
+			    (global_secflags & CIFSSEC_MAY_NTLMSSP))
+				return RawNTLMSSP;
+			if ((server->sec_kerberos || server->sec_mskerberos) &&
+			    (global_secflags & CIFSSEC_MAY_KRB5))
+				return Kerberos;
+			/* Fallthrough */
+		default:
+			return Unspecified;
+		}
+	case CIFS_NEGFLAVOR_UNENCAP:
+		switch (requested) {
+		case NTLM:
+		case NTLMv2:
+			return requested;
+		case Unspecified:
+			if (global_secflags & CIFSSEC_MAY_NTLMV2)
+				return NTLMv2;
+			if (global_secflags & CIFSSEC_MAY_NTLM)
+				return NTLM;
+		default:
+			/* Fallthrough to attempt LANMAN authentication next */
+			break;
+		}
+	case CIFS_NEGFLAVOR_LANMAN:
+		switch (requested) {
+		case LANMAN:
+			return requested;
+		case Unspecified:
+			if (global_secflags & CIFSSEC_MAY_LANMAN)
+				return LANMAN;
+			/* Fallthrough */
+		default:
+			return Unspecified;
+		}
+	default:
+		return Unspecified;
+	}
+}
+
+struct sess_data {
+	unsigned int xid;
+	struct cifs_ses *ses;
+	struct nls_table *nls_cp;
+	void (*func)(struct sess_data *);
+	int result;
+
+	/* we will send the SMB in three pieces:
+	 * a fixed length beginning part, an optional
+	 * SPNEGO blob (which can be zero length), and a
+	 * last part which will include the strings
+	 * and rest of bcc area. This allows us to avoid
+	 * a large buffer 17K allocation
+	 */
+	int buf0_type;
+	struct kvec iov[3];
+};
+
+static int
+sess_alloc_buffer(struct sess_data *sess_data, int wct)
+{
+	int rc;
+	struct cifs_ses *ses = sess_data->ses;
+	struct smb_hdr *smb_buf;
+
+	rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
+				  (void **)&smb_buf);
+
+	if (rc)
+		return rc;
+
+	sess_data->iov[0].iov_base = (char *)smb_buf;
+	sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
+	/*
+	 * This variable will be used to clear the buffer
+	 * allocated above in case of any error in the calling function.
+	 */
+	sess_data->buf0_type = CIFS_SMALL_BUFFER;
+
+	/* 2000 big enough to fit max user, domain, NOS name etc. */
+	sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
+	if (!sess_data->iov[2].iov_base) {
+		rc = -ENOMEM;
+		goto out_free_smb_buf;
+	}
+
+	return 0;
+
+out_free_smb_buf:
+	kfree(smb_buf);
+	sess_data->iov[0].iov_base = NULL;
+	sess_data->iov[0].iov_len = 0;
+	sess_data->buf0_type = CIFS_NO_BUFFER;
+	return rc;
+}
+
+static void
+sess_free_buffer(struct sess_data *sess_data)
+{
+
+	free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
+	sess_data->buf0_type = CIFS_NO_BUFFER;
+	kfree(sess_data->iov[2].iov_base);
+}
+
+static int
+sess_establish_session(struct sess_data *sess_data)
+{
+	struct cifs_ses *ses = sess_data->ses;
+
+	mutex_lock(&ses->server->srv_mutex);
+	if (!ses->server->session_estab) {
+		if (ses->server->sign) {
+			ses->server->session_key.response =
+				kmemdup(ses->auth_key.response,
+				ses->auth_key.len, GFP_KERNEL);
+			if (!ses->server->session_key.response) {
+				mutex_unlock(&ses->server->srv_mutex);
+				return -ENOMEM;
+			}
+			ses->server->session_key.len =
+						ses->auth_key.len;
+		}
+		ses->server->sequence_number = 0x2;
+		ses->server->session_estab = true;
+	}
+	mutex_unlock(&ses->server->srv_mutex);
+
+	cifs_dbg(FYI, "CIFS session established successfully\n");
+	spin_lock(&GlobalMid_Lock);
+	ses->status = CifsGood;
+	ses->need_reconnect = false;
+	spin_unlock(&GlobalMid_Lock);
+
+	return 0;
+}
+
+static int
+sess_sendreceive(struct sess_data *sess_data)
+{
+	int rc;
+	struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
+	__u16 count;
+
+	count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
+	smb_buf->smb_buf_length =
+		cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count);
+	put_bcc(count, smb_buf);
+
+	rc = SendReceive2(sess_data->xid, sess_data->ses,
+			  sess_data->iov, 3 /* num_iovecs */,
+			  &sess_data->buf0_type,
+			  CIFS_LOG_ERROR);
+
+	return rc;
+}
+
+/*
+ * LANMAN and plaintext are less secure and off by default.
+ * So we make this explicitly be turned on in kconfig (in the
+ * build) and turned on at runtime (changed from the default)
+ * in proc/fs/cifs or via mount parm.  Unfortunately this is
+ * needed for old Win (e.g. Win95), some obscure NAS and OS/2
+ */
+#ifdef CONFIG_CIFS_WEAK_PW_HASH
+static void
+sess_auth_lanman(struct sess_data *sess_data)
+{
+	int rc = 0;
+	struct smb_hdr *smb_buf;
+	SESSION_SETUP_ANDX *pSMB;
+	char *bcc_ptr;
+	struct cifs_ses *ses = sess_data->ses;
+	char lnm_session_key[CIFS_AUTH_RESP_SIZE];
+	__u32 capabilities;
+	__u16 bytes_remaining;
+
+	/* lanman 2 style sessionsetup */
+	/* wct = 10 */
+	rc = sess_alloc_buffer(sess_data, 10);
+	if (rc)
+		goto out;
+
+	pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
+	bcc_ptr = sess_data->iov[2].iov_base;
+	capabilities = cifs_ssetup_hdr(ses, pSMB);
+
+	pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
+
+	/* no capabilities flags in old lanman negotiation */
+	pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
+
+	/* Calculate hash with password and copy into bcc_ptr.
+	 * Encryption Key (stored as in cryptkey) gets used if the
+	 * security mode bit in Negottiate Protocol response states
+	 * to use challenge/response method (i.e. Password bit is 1).
+	 */
+	rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
+			      ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
+			      true : false, lnm_session_key);
+
+	memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
+	bcc_ptr += CIFS_AUTH_RESP_SIZE;
+
+	/*
+	 * can not sign if LANMAN negotiated so no need
+	 * to calculate signing key? but what if server
+	 * changed to do higher than lanman dialect and
+	 * we reconnected would we ever calc signing_key?
+	 */
+
+	cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n");
+	/* Unicode not allowed for LANMAN dialects */
+	ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
+
+	sess_data->iov[2].iov_len = (long) bcc_ptr -
+			(long) sess_data->iov[2].iov_base;
+
+	rc = sess_sendreceive(sess_data);
+	if (rc)
+		goto out;
+
+	pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
+	smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
+
+	/* lanman response has a word count of 3 */
+	if (smb_buf->WordCount != 3) {
+		rc = -EIO;
+		cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
+		goto out;
+	}
+
+	if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
+		cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
+
+	ses->Suid = smb_buf->Uid;   /* UID left in wire format (le) */
+	cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
+
+	bytes_remaining = get_bcc(smb_buf);
+	bcc_ptr = pByteArea(smb_buf);
+
+	/* BB check if Unicode and decode strings */
+	if (bytes_remaining == 0) {
+		/* no string area to decode, do nothing */
+	} else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
+		/* unicode string area must be word-aligned */
+		if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
+			++bcc_ptr;
+			--bytes_remaining;
+		}
+		decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
+				      sess_data->nls_cp);
+	} else {
+		decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
+				    sess_data->nls_cp);
+	}
+
+	rc = sess_establish_session(sess_data);
+out:
+	sess_data->result = rc;
+	sess_data->func = NULL;
+	sess_free_buffer(sess_data);
+}
+
+#endif
+
+static void
+sess_auth_ntlm(struct sess_data *sess_data)
+{
+	int rc = 0;
+	struct smb_hdr *smb_buf;
+	SESSION_SETUP_ANDX *pSMB;
+	char *bcc_ptr;
+	struct cifs_ses *ses = sess_data->ses;
+	__u32 capabilities;
+	__u16 bytes_remaining;
+
+	/* old style NTLM sessionsetup */
+	/* wct = 13 */
+	rc = sess_alloc_buffer(sess_data, 13);
+	if (rc)
+		goto out;
+
+	pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
+	bcc_ptr = sess_data->iov[2].iov_base;
+	capabilities = cifs_ssetup_hdr(ses, pSMB);
+
+	pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
+	pSMB->req_no_secext.CaseInsensitivePasswordLength =
+			cpu_to_le16(CIFS_AUTH_RESP_SIZE);
+	pSMB->req_no_secext.CaseSensitivePasswordLength =
+			cpu_to_le16(CIFS_AUTH_RESP_SIZE);
+
+	/* calculate ntlm response and session key */
+	rc = setup_ntlm_response(ses, sess_data->nls_cp);
+	if (rc) {
+		cifs_dbg(VFS, "Error %d during NTLM authentication\n",
+				 rc);
+		goto out;
+	}
+
+	/* copy ntlm response */
+	memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
+			CIFS_AUTH_RESP_SIZE);
+	bcc_ptr += CIFS_AUTH_RESP_SIZE;
+	memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
+			CIFS_AUTH_RESP_SIZE);
+	bcc_ptr += CIFS_AUTH_RESP_SIZE;
+
+	if (ses->capabilities & CAP_UNICODE) {
+		/* unicode strings must be word aligned */
+		if (sess_data->iov[0].iov_len % 2) {
+			*bcc_ptr = 0;
+			bcc_ptr++;
+		}
+		unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
+	} else {
+		ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
+	}
+
+
+	sess_data->iov[2].iov_len = (long) bcc_ptr -
+			(long) sess_data->iov[2].iov_base;
+
+	rc = sess_sendreceive(sess_data);
+	if (rc)
+		goto out;
+
+	pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
+	smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
+
+	if (smb_buf->WordCount != 3) {
+		rc = -EIO;
+		cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
+		goto out;
+	}
+
+	if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
+		cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
+
+	ses->Suid = smb_buf->Uid;   /* UID left in wire format (le) */
+	cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
+
+	bytes_remaining = get_bcc(smb_buf);
+	bcc_ptr = pByteArea(smb_buf);
+
+	/* BB check if Unicode and decode strings */
+	if (bytes_remaining == 0) {
+		/* no string area to decode, do nothing */
+	} else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
+		/* unicode string area must be word-aligned */
+		if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
+			++bcc_ptr;
+			--bytes_remaining;
+		}
+		decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
+				      sess_data->nls_cp);
+	} else {
+		decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
+				    sess_data->nls_cp);
+	}
+
+	rc = sess_establish_session(sess_data);
+out:
+	sess_data->result = rc;
+	sess_data->func = NULL;
+	sess_free_buffer(sess_data);
+	kfree(ses->auth_key.response);
+	ses->auth_key.response = NULL;
+}
+
+static void
+sess_auth_ntlmv2(struct sess_data *sess_data)
+{
+	int rc = 0;
+	struct smb_hdr *smb_buf;
+	SESSION_SETUP_ANDX *pSMB;
+	char *bcc_ptr;
+	struct cifs_ses *ses = sess_data->ses;
+	__u32 capabilities;
+	__u16 bytes_remaining;
+
+	/* old style NTLM sessionsetup */
+	/* wct = 13 */
+	rc = sess_alloc_buffer(sess_data, 13);
+	if (rc)
+		goto out;
+
+	pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
+	bcc_ptr = sess_data->iov[2].iov_base;
+	capabilities = cifs_ssetup_hdr(ses, pSMB);
+
+	pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
+
+	/* LM2 password would be here if we supported it */
+	pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
+
+	/* calculate nlmv2 response and session key */
+	rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
+	if (rc) {
+		cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
+		goto out;
+	}
+
+	memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
+			ses->auth_key.len - CIFS_SESS_KEY_SIZE);
+	bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
+
+	/* set case sensitive password length after tilen may get
+	 * assigned, tilen is 0 otherwise.
+	 */
+	pSMB->req_no_secext.CaseSensitivePasswordLength =
+		cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
+
+	if (ses->capabilities & CAP_UNICODE) {
+		if (sess_data->iov[0].iov_len % 2) {
+			*bcc_ptr = 0;
+			bcc_ptr++;
+		}
+		unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
+	} else {
+		ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
+	}
+
+
+	sess_data->iov[2].iov_len = (long) bcc_ptr -
+			(long) sess_data->iov[2].iov_base;
+
+	rc = sess_sendreceive(sess_data);
+	if (rc)
+		goto out;
+
+	pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
+	smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
+
+	if (smb_buf->WordCount != 3) {
+		rc = -EIO;
+		cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
+		goto out;
+	}
+
+	if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
+		cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
+
+	ses->Suid = smb_buf->Uid;   /* UID left in wire format (le) */
+	cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
+
+	bytes_remaining = get_bcc(smb_buf);
+	bcc_ptr = pByteArea(smb_buf);
+
+	/* BB check if Unicode and decode strings */
+	if (bytes_remaining == 0) {
+		/* no string area to decode, do nothing */
+	} else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
+		/* unicode string area must be word-aligned */
+		if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
+			++bcc_ptr;
+			--bytes_remaining;
+		}
+		decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
+				      sess_data->nls_cp);
+	} else {
+		decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
+				    sess_data->nls_cp);
+	}
+
+	rc = sess_establish_session(sess_data);
+out:
+	sess_data->result = rc;
+	sess_data->func = NULL;
+	sess_free_buffer(sess_data);
+	kfree(ses->auth_key.response);
+	ses->auth_key.response = NULL;
+}
+
+#ifdef CONFIG_CIFS_UPCALL
+static void
+sess_auth_kerberos(struct sess_data *sess_data)
+{
+	int rc = 0;
+	struct smb_hdr *smb_buf;
+	SESSION_SETUP_ANDX *pSMB;
+	char *bcc_ptr;
+	struct cifs_ses *ses = sess_data->ses;
+	__u32 capabilities;
+	__u16 bytes_remaining;
+	struct key *spnego_key = NULL;
+	struct cifs_spnego_msg *msg;
+	u16 blob_len;
+
+	/* extended security */
+	/* wct = 12 */
+	rc = sess_alloc_buffer(sess_data, 12);
+	if (rc)
+		goto out;
+
+	pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
+	bcc_ptr = sess_data->iov[2].iov_base;
+	capabilities = cifs_ssetup_hdr(ses, pSMB);
+
+	spnego_key = cifs_get_spnego_key(ses);
+	if (IS_ERR(spnego_key)) {
+		rc = PTR_ERR(spnego_key);
+		spnego_key = NULL;
+		goto out;
+	}
+
+	msg = spnego_key->payload.data;
+	/*
+	 * check version field to make sure that cifs.upcall is
+	 * sending us a response in an expected form
+	 */
+	if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
+		cifs_dbg(VFS,
+		  "incorrect version of cifs.upcall (expected %d but got %d)",
+			      CIFS_SPNEGO_UPCALL_VERSION, msg->version);
+		rc = -EKEYREJECTED;
+		goto out_put_spnego_key;
+	}
+
+	ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
+					 GFP_KERNEL);
+	if (!ses->auth_key.response) {
+		cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory",
+				msg->sesskey_len);
+		rc = -ENOMEM;
+		goto out_put_spnego_key;
+	}
+	ses->auth_key.len = msg->sesskey_len;
+
+	pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
+	capabilities |= CAP_EXTENDED_SECURITY;
+	pSMB->req.Capabilities = cpu_to_le32(capabilities);
+	sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
+	sess_data->iov[1].iov_len = msg->secblob_len;
+	pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
+
+	if (ses->capabilities & CAP_UNICODE) {
+		/* unicode strings must be word aligned */
+		if ((sess_data->iov[0].iov_len
+			+ sess_data->iov[1].iov_len) % 2) {
+			*bcc_ptr = 0;
+			bcc_ptr++;
+		}
+		unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
+		unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
+	} else {
+		/* BB: is this right? */
+		ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
+	}
+
+	sess_data->iov[2].iov_len = (long) bcc_ptr -
+			(long) sess_data->iov[2].iov_base;
+
+	rc = sess_sendreceive(sess_data);
+	if (rc)
+		goto out_put_spnego_key;
+
+	pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
+	smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
+
+	if (smb_buf->WordCount != 4) {
+		rc = -EIO;
+		cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
+		goto out_put_spnego_key;
+	}
+
+	if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
+		cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
+
+	ses->Suid = smb_buf->Uid;   /* UID left in wire format (le) */
+	cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
+
+	bytes_remaining = get_bcc(smb_buf);
+	bcc_ptr = pByteArea(smb_buf);
+
+	blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
+	if (blob_len > bytes_remaining) {
+		cifs_dbg(VFS, "bad security blob length %d\n",
+				blob_len);
+		rc = -EINVAL;
+		goto out_put_spnego_key;
+	}
+	bcc_ptr += blob_len;
+	bytes_remaining -= blob_len;
+
+	/* BB check if Unicode and decode strings */
+	if (bytes_remaining == 0) {
+		/* no string area to decode, do nothing */
+	} else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
+		/* unicode string area must be word-aligned */
+		if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
+			++bcc_ptr;
+			--bytes_remaining;
+		}
+		decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
+				      sess_data->nls_cp);
+	} else {
+		decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
+				    sess_data->nls_cp);
+	}
+
+	rc = sess_establish_session(sess_data);
+out_put_spnego_key:
+	key_invalidate(spnego_key);
+	key_put(spnego_key);
+out:
+	sess_data->result = rc;
+	sess_data->func = NULL;
+	sess_free_buffer(sess_data);
+	kfree(ses->auth_key.response);
+	ses->auth_key.response = NULL;
+}
+
+#endif /* ! CONFIG_CIFS_UPCALL */
+
+/*
+ * The required kvec buffers have to be allocated before calling this
+ * function.
+ */
+static int
+_sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
+{
+	struct smb_hdr *smb_buf;
+	SESSION_SETUP_ANDX *pSMB;
+	struct cifs_ses *ses = sess_data->ses;
+	__u32 capabilities;
+	char *bcc_ptr;
+
+	pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
+	smb_buf = (struct smb_hdr *)pSMB;
+
+	capabilities = cifs_ssetup_hdr(ses, pSMB);
+	if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
+		cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
+		return -ENOSYS;
+	}
+
+	pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
+	capabilities |= CAP_EXTENDED_SECURITY;
+	pSMB->req.Capabilities |= cpu_to_le32(capabilities);
+
+	bcc_ptr = sess_data->iov[2].iov_base;
+	/* unicode strings must be word aligned */
+	if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) {
+		*bcc_ptr = 0;
+		bcc_ptr++;
+	}
+	unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
+
+	sess_data->iov[2].iov_len = (long) bcc_ptr -
+					(long) sess_data->iov[2].iov_base;
+
+	return 0;
+}
+
+static void
+sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
+
+static void
+sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
+{
+	int rc;
+	struct smb_hdr *smb_buf;
+	SESSION_SETUP_ANDX *pSMB;
+	struct cifs_ses *ses = sess_data->ses;
+	__u16 bytes_remaining;
+	char *bcc_ptr;
+	u16 blob_len;
+
+	cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
+
+	/*
+	 * if memory allocation is successful, caller of this function
+	 * frees it.
+	 */
+	ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
+	if (!ses->ntlmssp) {
+		rc = -ENOMEM;
+		goto out;
+	}
+	ses->ntlmssp->sesskey_per_smbsess = false;
+
+	/* wct = 12 */
+	rc = sess_alloc_buffer(sess_data, 12);
+	if (rc)
+		goto out;
+
+	pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
+
+	/* Build security blob before we assemble the request */
+	build_ntlmssp_negotiate_blob(pSMB->req.SecurityBlob, ses);
+	sess_data->iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
+	sess_data->iov[1].iov_base = pSMB->req.SecurityBlob;
+	pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
+
+	rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
+	if (rc)
+		goto out;
+
+	rc = sess_sendreceive(sess_data);
+
+	pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
+	smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
+
+	/* If true, rc here is expected and not an error */
+	if (sess_data->buf0_type != CIFS_NO_BUFFER &&
+	    smb_buf->Status.CifsError ==
+			cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
+		rc = 0;
+
+	if (rc)
+		goto out;
+
+	cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
+
+	if (smb_buf->WordCount != 4) {
+		rc = -EIO;
+		cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
+		goto out;
+	}
+
+	ses->Suid = smb_buf->Uid;   /* UID left in wire format (le) */
+	cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
+
+	bytes_remaining = get_bcc(smb_buf);
+	bcc_ptr = pByteArea(smb_buf);
+
+	blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
+	if (blob_len > bytes_remaining) {
+		cifs_dbg(VFS, "bad security blob length %d\n",
+				blob_len);
+		rc = -EINVAL;
+		goto out;
+	}
+
+	rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
+out:
+	sess_free_buffer(sess_data);
+
+	if (!rc) {
+		sess_data->func = sess_auth_rawntlmssp_authenticate;
+		return;
+	}
+
+	/* Else error. Cleanup */
+	kfree(ses->auth_key.response);
+	ses->auth_key.response = NULL;
+	kfree(ses->ntlmssp);
+	ses->ntlmssp = NULL;
+
+	sess_data->func = NULL;
+	sess_data->result = rc;
+}
+
+static void
+sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
+{
+	int rc;
+	struct smb_hdr *smb_buf;
+	SESSION_SETUP_ANDX *pSMB;
+	struct cifs_ses *ses = sess_data->ses;
+	__u16 bytes_remaining;
+	char *bcc_ptr;
+	char *ntlmsspblob = NULL;
+	u16 blob_len;
+
+	cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
+
+	/* wct = 12 */
+	rc = sess_alloc_buffer(sess_data, 12);
+	if (rc)
+		goto out;
+
+	/* Build security blob before we assemble the request */
+	pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
+	smb_buf = (struct smb_hdr *)pSMB;
+	/*
+	 * 5 is an empirical value, large enough to hold
+	 * authenticate message plus max 10 of av paris,
+	 * domain, user, workstation names, flags, etc.
+	 */
+	ntlmsspblob = kzalloc(5*sizeof(struct _AUTHENTICATE_MESSAGE),
+				GFP_KERNEL);
+	if (!ntlmsspblob) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	rc = build_ntlmssp_auth_blob(ntlmsspblob,
+					&blob_len, ses, sess_data->nls_cp);
+	if (rc)
+		goto out_free_ntlmsspblob;
+	sess_data->iov[1].iov_len = blob_len;
+	sess_data->iov[1].iov_base = ntlmsspblob;
+	pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
+	/*
+	 * Make sure that we tell the server that we are using
+	 * the uid that it just gave us back on the response
+	 * (challenge)
+	 */
+	smb_buf->Uid = ses->Suid;
+
+	rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
+	if (rc)
+		goto out_free_ntlmsspblob;
+
+	rc = sess_sendreceive(sess_data);
+	if (rc)
+		goto out_free_ntlmsspblob;
+
+	pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
+	smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
+	if (smb_buf->WordCount != 4) {
+		rc = -EIO;
+		cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
+		goto out_free_ntlmsspblob;
+	}
+
+	if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
+		cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
+
+	if (ses->Suid != smb_buf->Uid) {
+		ses->Suid = smb_buf->Uid;
+		cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
+	}
+
+	bytes_remaining = get_bcc(smb_buf);
+	bcc_ptr = pByteArea(smb_buf);
+	blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
+	if (blob_len > bytes_remaining) {
+		cifs_dbg(VFS, "bad security blob length %d\n",
+				blob_len);
+		rc = -EINVAL;
+		goto out_free_ntlmsspblob;
+	}
+	bcc_ptr += blob_len;
+	bytes_remaining -= blob_len;
+
+
+	/* BB check if Unicode and decode strings */
+	if (bytes_remaining == 0) {
+		/* no string area to decode, do nothing */
+	} else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
+		/* unicode string area must be word-aligned */
+		if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
+			++bcc_ptr;
+			--bytes_remaining;
+		}
+		decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
+				      sess_data->nls_cp);
+	} else {
+		decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
+				    sess_data->nls_cp);
+	}
+
+out_free_ntlmsspblob:
+	kfree(ntlmsspblob);
+out:
+	sess_free_buffer(sess_data);
+
+	 if (!rc)
+		rc = sess_establish_session(sess_data);
+
+	/* Cleanup */
+	kfree(ses->auth_key.response);
+	ses->auth_key.response = NULL;
+	kfree(ses->ntlmssp);
+	ses->ntlmssp = NULL;
+
+	sess_data->func = NULL;
+	sess_data->result = rc;
+}
+
+static int select_sec(struct cifs_ses *ses, struct sess_data *sess_data)
+{
+	int type;
+
+	type = select_sectype(ses->server, ses->sectype);
+	cifs_dbg(FYI, "sess setup type %d\n", type);
+	if (type == Unspecified) {
+		cifs_dbg(VFS,
+			"Unable to select appropriate authentication method!");
+		return -EINVAL;
+	}
+
+	switch (type) {
+	case LANMAN:
+		/* LANMAN and plaintext are less secure and off by default.
+		 * So we make this explicitly be turned on in kconfig (in the
+		 * build) and turned on at runtime (changed from the default)
+		 * in proc/fs/cifs or via mount parm.  Unfortunately this is
+		 * needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
+#ifdef CONFIG_CIFS_WEAK_PW_HASH
+		sess_data->func = sess_auth_lanman;
+		break;
+#else
+		return -EOPNOTSUPP;
+#endif
+	case NTLM:
+		sess_data->func = sess_auth_ntlm;
+		break;
+	case NTLMv2:
+		sess_data->func = sess_auth_ntlmv2;
+		break;
+	case Kerberos:
+#ifdef CONFIG_CIFS_UPCALL
+		sess_data->func = sess_auth_kerberos;
+		break;
+#else
+		cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
+		return -ENOSYS;
+		break;
+#endif /* CONFIG_CIFS_UPCALL */
+	case RawNTLMSSP:
+		sess_data->func = sess_auth_rawntlmssp_negotiate;
+		break;
+	default:
+		cifs_dbg(VFS, "secType %d not supported!\n", type);
+		return -ENOSYS;
+	}
+
+	return 0;
+}
+
+int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
+		    const struct nls_table *nls_cp)
+{
+	int rc = 0;
+	struct sess_data *sess_data;
+
+	if (ses == NULL) {
+		WARN(1, "%s: ses == NULL!", __func__);
+		return -EINVAL;
+	}
+
+	sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
+	if (!sess_data)
+		return -ENOMEM;
+
+	rc = select_sec(ses, sess_data);
+	if (rc)
+		goto out;
+
+	sess_data->xid = xid;
+	sess_data->ses = ses;
+	sess_data->buf0_type = CIFS_NO_BUFFER;
+	sess_data->nls_cp = (struct nls_table *) nls_cp;
+
+	while (sess_data->func)
+		sess_data->func(sess_data);
+
+	/* Store result before we free sess_data */
+	rc = sess_data->result;
+
+out:
+	kfree(sess_data);
+	return rc;
+}