path: root/usr/src/uts/common/fs/smbclnt/netsmb/smb_smb.c

/*
 * Copyright (c) 2000-2001 Boris Popov
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by Boris Popov.
 * 4. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $Id: smb_smb.c,v 1.35.100.2 2005/06/02 00:55:39 lindak Exp $
 */

/*
 * Portions Copyright (C) 2001 - 2014 Apple Inc. All rights reserved.
 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright 2018 Nexenta Systems, Inc.  All rights reserved.
 */

/*
 * various SMB requests. Most of the routines merely packs data into mbufs.
 */
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kmem.h>
#include <sys/proc.h>
#include <sys/lock.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <sys/random.h>
#include <sys/note.h>
#include <sys/errno.h>
#include <sys/cmn_err.h>

#include <netsmb/smb_osdep.h>

#include <netsmb/smb.h>
#include <netsmb/smb_conn.h>
#include <netsmb/smb_rq.h>
#include <netsmb/smb_subr.h>
#include <netsmb/smb_tran.h>

#define	STYPE_LEN	8	/* share type strings */

struct smb_dialect {
	int		d_id;
	const char	*d_name;
};

static struct smb_dialect smb_dialects[3] = {
	{SMB_DIALECT_NTLM0_12,	"NT LANMAN 1.0"},
	{SMB_DIALECT_NTLM0_12,	"NT LM 0.12"},
#define	NDIALECT_SMB1	2
	{SMB_DIALECT_SMB2_FF,	"SMB 2.???"},
#define	NDIALECT_SMB2	3
};

static const uint32_t smb_clnt_caps_mask =
    SMB_CAP_UNICODE |
    SMB_CAP_LARGE_FILES |
    SMB_CAP_NT_SMBS |
    SMB_CAP_STATUS32 |
    SMB_CAP_EXT_SECURITY;

/*
 * Default timeout values, all in seconds.
 * Make these tunable (only via mdb for now).
 */
int smb_timo_notice = 15;
int smb_timo_default = 30;	/* was SMB_DEFRQTIMO */
int smb_timo_logon = 45;
int smb_timo_open = 45;
int smb_timo_read = 45;
int smb_timo_write = 60;	/* was SMBWRTTIMO */
int smb_timo_append = 90;

int
smb_smb_negotiate(struct smb_vc *vcp, struct smb_cred *scred)
{
	smb_sopt_t *sv = &vcp->vc_sopt;
	smbioc_ssn_work_t *wk = &vcp->vc_work;
	struct smb_rq *rqp = NULL;
	struct mbchain *mbp = NULL;
	struct mdchain *mdp = NULL;
	struct smb_dialect *dp;
	int err, sblen, tlen;
	uint8_t wc, eklen;
	uint16_t dindex, bc;
	uint16_t ndialects;
	boolean_t will_sign = B_FALSE;

	/*
	 * Initialize: vc_hflags and vc_hflags2.
	 * Note: vcp->vc_hflags* are copied into the
	 * (per request) rqp->rq_hflags* by smb_rq_init.
	 *
	 * Like Windows, set FLAGS2_UNICODE in our first request,
	 * even though technically we don't yet know whether the
	 * server supports Unicode.  Will clear this flag below
	 * if we find out it doesn't.  Need to do this because
	 * some servers reject all non-Unicode requests.
	 */
	vcp->vc_hflags =
	    SMB_FLAGS_CASELESS |
	    SMB_FLAGS_CANONICAL_PATHNAMES;
	vcp->vc_hflags2 =
	    SMB_FLAGS2_KNOWS_LONG_NAMES |
	    SMB_FLAGS2_KNOWS_EAS |
	    SMB_FLAGS2_IS_LONG_NAME |
	    SMB_FLAGS2_EXT_SEC |
	    SMB_FLAGS2_ERR_STATUS |
	    SMB_FLAGS2_UNICODE;

	/*
	 * The initial UID needs to be zero,
	 */
	vcp->vc_smbuid = 0;

	/*
	 * (Re)init negotiated values
	 */
	bzero(sv, sizeof (*sv));
	sv->sv_maxmux = 1;
	sv->sv_maxvcs = 1;
	sv->sv_maxtx = 1024;

	/*
	 * Should we offer the magic SMB2 dialect?
	 */
	if (vcp->vc_ssn.ssn_maxver >= SMB2_DIALECT_BASE)
		ndialects = NDIALECT_SMB2;
	else
		ndialects = NDIALECT_SMB1;

	err = smb_rq_alloc(VCTOCP(vcp), SMB_COM_NEGOTIATE, scred, &rqp);
	if (err)
		return (err);

	/*
	 * Build the SMB request.
	 */
	smb_rq_getrequest(rqp, &mbp);
	smb_rq_wstart(rqp);
	smb_rq_wend(rqp);
	smb_rq_bstart(rqp);
	for (dindex = 0; dindex < ndialects; dindex++) {
		dp = &smb_dialects[dindex];
		mb_put_uint8(mbp, SMB_DT_DIALECT);
		tlen = strlen(dp->d_name) + 1;
		mb_put_mem(mbp, dp->d_name, tlen, MB_MSYSTEM);
	}
	smb_rq_bend(rqp);

	/*
	 * Do the OTW call.
	 */
	err = smb_rq_internal(rqp, smb_timo_default);
	/*
	 * If it's an SMB1-to-SMB2 negotiate response,
	 * call the special handler and then skip the
	 * whole rest of this function.
	 */
	if (err == EPROTO) {
		err = smb2_parse_smb1nego_resp(rqp);
		smb_rq_done(rqp);
		return (err);
	}
	if (err) {
		SMBSDEBUG("smb_rq_internal, err %d", err);
		goto errout;
	}
	/* Should only get status success. */
	if (rqp->sr_error != NT_STATUS_SUCCESS) {
		err = ENOTSUP;
		goto errout;
	}

	/*
	 * Decode the response
	 *
	 * Comments to right show names as described in
	 * The Microsoft SMB Protocol spec. [MS-SMB]
	 * section 2.2.3
	 */
	smb_rq_getreply(rqp, &mdp);
	(void) md_get_uint8(mdp, &wc);
	err = md_get_uint16le(mdp, &dindex);
	if (err != 0)
		goto errout;
	if (dindex >= ndialects) {
		SMBERROR("Invalid dialect index from server: %s\n",
		    vcp->vc_srvname);
		err = EBADRPC;
		goto errout;
	}
	dp = smb_dialects + dindex;
	sv->sv_proto = dp->d_id;
	SMBSDEBUG("Dialect %s", dp->d_name);
	if (dp->d_id < SMB_DIALECT_NTLM0_12) {
		SMBSDEBUG("old dialect %s", dp->d_name);
		goto errout;
	}
	if (wc != 17) {
		SMBSDEBUG("bad wc %d", (int)wc);
		goto errout;
	}
	md_get_uint8(mdp, &sv->sv_sm);		/* SecurityMode */
	md_get_uint16le(mdp, &sv->sv_maxmux);	/* MaxMpxCount */
	md_get_uint16le(mdp, &sv->sv_maxvcs);	/* MaxCountVCs */
	md_get_uint32le(mdp, &sv->sv_maxtx);	/* MaxBufferSize */
	md_get_uint32le(mdp, &sv->sv_maxraw);	/* MaxRawSize */
	md_get_uint32le(mdp, &sv->sv_skey);	/* SessionKey */
	md_get_uint32le(mdp, &sv->sv_caps);	/* Capabilities */
	md_get_mem(mdp, NULL, 8, MB_MSYSTEM);	/* SystemTime(s) */
	md_get_uint16le(mdp, (uint16_t *)&sv->sv_tz);
	md_get_uint8(mdp, &eklen);	/* EncryptionKeyLength */
	err = md_get_uint16le(mdp, &bc);	/* ByteCount */
	if (err)
		goto errout;

	/* BEGIN CSTYLED */
	/*
	 * Will we do SMB signing?  Or block the connection?
	 * The table below describes this logic.  References:
	 * [Windows Server Protocols: MS-SMB, sec. 3.2.4.2.3]
	 * http://msdn.microsoft.com/en-us/library/cc212511.aspx
	 * http://msdn.microsoft.com/en-us/library/cc212929.aspx
	 *
	 * Srv/Cli     | Required | Enabled    | If Required | Disabled
	 * ------------+----------+------------+-------------+-----------
	 * Required    | Signed   | Signed     | Signed      | Blocked [1]
	 * ------------+----------+------------+-------------+-----------
	 * Enabled     | Signed   | Signed     | Not Signed  | Not Signed
	 * ------------+----------+------------+-------------+-----------
	 * If Required | Signed   | Not Signed | Not Signed  | Not Signed
	 * ------------+----------+------------+-------------+-----------
	 * Disabled    | Blocked  | Not Signed | Not Signed  | Not Signed
	 *
	 * [1] Like Windows 2003 and later, we don't really implement
	 * the "Disabled" setting.  Instead we implement "If Required",
	 * so we always sign if the server requires signing.
	 */
	/* END CSTYLED */

	if (sv->sv_sm & SMB_SM_SIGS_REQUIRE) {
		/*
		 * Server requires signing.  We will sign,
		 * even if local setting is "disabled".
		 */
		will_sign = B_TRUE;
	} else if (sv->sv_sm & SMB_SM_SIGS) {
		/*
		 * Server enables signing (client's option).
		 * If enabled locally, do signing.
		 */
		if (vcp->vc_vopt & SMBVOPT_SIGNING_ENABLED)
			will_sign = B_TRUE;
		/* else not signing. */
	} else {
		/*
		 * Server does not support signing.
		 * If we "require" it, bail now.
		 */
		if (vcp->vc_vopt & SMBVOPT_SIGNING_REQUIRED) {
			SMBERROR("Client requires signing "
			    "but server has it disabled.");
			err = EBADRPC;
			goto errout;
		}
	}

	/*
	 * Anonymous sessions can't sign.
	 */
	if (vcp->vc_vopt & SMBVOPT_ANONYMOUS) {
		will_sign = B_FALSE;
	}

	SMBSDEBUG("Security signatures: %d", (int)will_sign);
	if (will_sign) {
		vcp->vc_flags |= SMBV_SIGNING;
		vcp->vc_hflags2 |= SMB_FLAGS2_SECURITY_SIGNATURE;

		/*
		 * MS-SMB 2.2.4.5 says that when SMB signing is enabled,
		 * we should NOT use "large read/write" even though the
		 * server might offer those capabilities.
		 */
		sv->sv_caps &= ~(SMB_CAP_LARGE_READX | SMB_CAP_LARGE_WRITEX);
	}

	/* See comment above re. FLAGS2_UNICODE */
	if ((sv->sv_caps & SMB_CAP_UNICODE) != 0)
		vcp->vc_flags |= SMBV_UNICODE;
	else
		vcp->vc_hflags2 &= ~SMB_FLAGS2_UNICODE;

	if ((sv->sv_caps & SMB_CAP_STATUS32) == 0) {
		/* They don't do NT error codes. */
		vcp->vc_hflags2 &= ~SMB_FLAGS2_ERR_STATUS;
	}

	/*
	 * Warn if they don't support SMB_CAP_NT_SMBS
	 * (We'll try to use NtCreate anyway)
	 */
	if ((sv->sv_caps & SMB_CAP_NT_SMBS) == 0) {
		cmn_err(CE_NOTE, "%s does not support SMB_CAP_NT_SMBS",
		    vcp->vc_srvname);
	}

	/*
	 * The rest of the message varies depending on
	 * whether we've negotiated "extended security".
	 *
	 * With extended security, we have:
	 *	Server_GUID	(length 16)
	 *	Security_BLOB
	 * Otherwise we have:
	 *	EncryptionKey (length is eklen)
	 *	PrimaryDomain
	 */
	if (sv->sv_caps & SMB_CAP_EXT_SECURITY) {
		SMBSDEBUG("Ext.Security: yes");

		/*
		 * Skip the server GUID.
		 */
		err = md_get_mem(mdp, NULL, SMB_GUIDLEN, MB_MSYSTEM);
		if (err)
			goto errout;
		/*
		 * Remainder is the security blob.
		 * Note: eklen "must be ignored" [MS-SMB]
		 */
		sblen = (int)bc - SMB_GUIDLEN;
		if (sblen < 0)
			goto errout;
		/* Security blob (hint) is next */
	} else {
		SMBSDEBUG("Ext.Security: no");
		err = ENOTSUP;
		goto errout;
	}

	/*
	 * Copy the security blob out to user space.
	 * Buffer addr,size in vc_auth_rbuf,rlen
	 */
	if (wk->wk_u_auth_rlen < sblen) {
		SMBSDEBUG("vc_auth_rbuf too small");
		/* Give caller required size. */
		wk->wk_u_auth_rlen = sblen;
		err = EMSGSIZE;
		goto errout;
	}
	wk->wk_u_auth_rlen = sblen;
	err = md_get_mem(mdp, wk->wk_u_auth_rbuf.lp_ptr, sblen, MB_MUSER);
	if (err)
		goto errout;

	/*
	 * A few sanity checks on what we received,
	 * becuse we will send these in ssnsetup.
	 *
	 * Maximum outstanding requests (we care),
	 * and Max. VCs (we only use one).  Also,
	 * MaxBufferSize lower limit per spec.
	 */
	if (sv->sv_maxmux < 1)
		sv->sv_maxmux = 1;
	if (sv->sv_maxvcs < 1)
		sv->sv_maxvcs = 1;
	if (sv->sv_maxtx < 1024)
		sv->sv_maxtx = 1024;

	/*
	 * Maximum transfer size.
	 * Sanity checks:
	 *
	 * Let's be conservative about an upper limit here.
	 * Win2k uses 16644 (and others) so 32k should be a
	 * reasonable sanity limit for this value.
	 *
	 * Note that this limit does NOT affect READX/WRITEX
	 * with CAP_LARGE_..., which we nearly always use.
	 */
	vcp->vc_txmax = sv->sv_maxtx;
	if (vcp->vc_txmax > 0x8000)
		vcp->vc_txmax = 0x8000;

	/*
	 * Max read/write sizes, WITHOUT overhead.
	 * This is just the payload size, so we must
	 * leave room for the SMB headers, etc.
	 * This is just the ct_txmax value, but
	 * reduced and rounded down.  Tricky bit:
	 *
	 * Servers typically give us a value that's
	 * some nice "round" number, i.e 0x4000 plus
	 * some overhead, i.e. Win2k: 16644==0x4104
	 * Subtract for the SMB header (32) and the
	 * SMB command word and byte vectors (34?),
	 * then round down to a 512 byte multiple.
	 */
	tlen = vcp->vc_txmax - 68;
	tlen &= 0xFE00;

	vcp->vc_rwmax = tlen;
	vcp->vc_rxmax = tlen;
	vcp->vc_wxmax = tlen;

	/*
	 * Most of the "capability" bits we offer in session setup
	 * are just copied from those offered by the server.
	 */
	sv->sv_caps &= smb_clnt_caps_mask;

	smb_rq_done(rqp);
	return (0);

errout:
	smb_rq_done(rqp);
	if (err == 0)
		err = EBADRPC;
	return (err);
}

static const char NativeOS[] = "illumos";
static const char LanMan[] = "NETSMB";

int
smb_smb_ssnsetup(struct smb_vc *vcp, struct smb_cred *scred)
{
	smb_sopt_t *sv = &vcp->vc_sopt;
	smbioc_ssn_work_t *wk = &vcp->vc_work;
	struct smb_rq *rqp = NULL;
	struct mbchain *mbp = NULL;
	struct mdchain *mdp = NULL;
	char *sb;
	int err, ret;
	uint32_t caps;
	uint16_t action, bc, sblen;
	uint8_t wc;

	caps = sv->sv_caps;
	sb = wk->wk_u_auth_wbuf.lp_ptr;
	sblen = (uint16_t)wk->wk_u_auth_wlen;

	err = smb_rq_alloc(VCTOCP(vcp), SMB_COM_SESSION_SETUP_ANDX,
	    scred, &rqp);
	if (err != 0) {
		ret = err;
		goto out;
	}

	/*
	 * Build the SMB Session Setup request.
	 * Always extended security form.
	 */
	mbp = &rqp->sr_rq;
	smb_rq_wstart(rqp);
	mb_put_uint16le(mbp, 0xff);		/* 0: AndXCommand */
	mb_put_uint16le(mbp, 0);		/* 1: AndXOffset */
	mb_put_uint16le(mbp, sv->sv_maxtx);	/* 2: MaxBufferSize */
	mb_put_uint16le(mbp, sv->sv_maxmux);	/* 3: MaxMpxCount */
	mb_put_uint16le(mbp, 1);		/* 4: VcNumber */
	mb_put_uint32le(mbp, sv->sv_skey);	/* 5,6: Session Key */
	mb_put_uint16le(mbp, sblen);	/* 7: Sec. Blob Len */
	mb_put_uint32le(mbp, 0);	/* 8,9: reserved */
	mb_put_uint32le(mbp, caps);	/* 10,11: Capabilities */
	smb_rq_wend(rqp);		/* 12: Byte Count */
	smb_rq_bstart(rqp);
	err = mb_put_mem(mbp, sb, sblen, MB_MUSER);
	if (err != 0) {
		ret = err;
		goto out;
	}
	(void) smb_put_dstring(mbp, vcp, NativeOS, SMB_CS_NONE);
	(void) smb_put_dstring(mbp, vcp, LanMan, SMB_CS_NONE);
	smb_rq_bend(rqp);

	/*
	 * Run the request.  The return value here should be the
	 * return from this function, unless we fail decoding.
	 * Note: NT_STATUS_MORE_PROCESSING_REQUIRED is OK, and
	 * the caller expects EINPROGRESS for that case.
	 */
	ret = smb_rq_internal(rqp, smb_timo_logon);
	if (ret != 0)
		goto out;
	switch (rqp->sr_error) {
	case NT_STATUS_SUCCESS:
		break;
	case NT_STATUS_MORE_PROCESSING_REQUIRED:
		/* Keep going, but return... */
		ret = EINPROGRESS;
		break;
	default:
		ret = EAUTH;
		goto out;
	}

	if (vcp->vc_smbuid == 0)
		vcp->vc_smbuid = rqp->sr_rpuid;

	/*
	 * Parse the reply
	 */
	smb_rq_getreply(rqp, &mdp);

	err = md_get_uint8(mdp, &wc);
	if (err != 0)
		wc = 0;
	if (wc != 4) {
		ret = EBADRPC;
		goto out;
	}
	md_get_uint16le(mdp, NULL);	/* secondary cmd */
	md_get_uint16le(mdp, NULL);	/* andxoffset */
	md_get_uint16le(mdp, &action);	/* action XXX */
	md_get_uint16le(mdp, &sblen);	/* sec. blob len */
	md_get_uint16le(mdp, &bc);	/* byte count */
	/*
	 * Get the security blob, after
	 * sanity-checking the length.
	 */
	if (sblen == 0 || sblen > bc) {
		ret = EBADRPC;
		goto out;
	}
	if (sblen > wk->wk_u_auth_rlen) {
		ret = EBADRPC;
		goto out;
	}
	sb = wk->wk_u_auth_rbuf.lp_ptr;
	err = md_get_mem(mdp, sb, sblen, MB_MUSER);
	if (err) {
		ret = EBADRPC;
		goto out;
	}

	/*
	 * Native OS, LANMGR, & Domain follow here.
	 * We don't need them and don't parse them.
	 */

out:
	if (err != 0 && err != EINPROGRESS) {
		/* UID no longer valid. */
		vcp->vc_smbuid = 0;
	}
	if (rqp)
		smb_rq_done(rqp);

	return (ret);
}

int
smb_smb_logoff(struct smb_vc *vcp, struct smb_cred *scred)
{
	struct smb_rq *rqp;
	struct mbchain *mbp;
	int error;

	if (vcp->vc_smbuid == SMB_UID_UNKNOWN)
		return (0);

	error = smb_rq_alloc(VCTOCP(vcp), SMB_COM_LOGOFF_ANDX, scred, &rqp);
	if (error)
		return (error);
	mbp = &rqp->sr_rq;
	smb_rq_wstart(rqp);
	mb_put_uint8(mbp, 0xff);
	mb_put_uint8(mbp, 0);
	mb_put_uint16le(mbp, 0);
	smb_rq_wend(rqp);
	smb_rq_bstart(rqp);
	smb_rq_bend(rqp);

	/*
	 * Run this with a relatively short timeout. (5 sec.)
	 * We don't really care about the result here.
	 * Also, don't reconnect for this, of course!
	 */
	rqp->sr_flags |= SMBR_NORECONNECT;
	error = smb_rq_internal(rqp, 5);
	smb_rq_done(rqp);
	return (error);
}

/*
 * Get the string representation of a share "use" type,
 * as needed for the "service" in tree connect.
 */
static const char *
smb_share_typename(uint32_t stype)
{
	const char *p;

	switch (stype) {
	case STYPE_DISKTREE:
		p = "A:";
		break;
	case STYPE_PRINTQ:
		p = "LPT1:";
		break;
	case STYPE_DEVICE:
		p = "COMM";
		break;
	case STYPE_IPC:
		p = "IPC";
		break;
	case STYPE_UNKNOWN:
	default:
		p = "?????";
		break;
	}
	return (p);
}

/*
 * Parse a share type name (inverse of above)
 */
static uint32_t
smb_share_parsetype(char *name)
{
	int stype;

	switch (*name) {
	case 'A':	/* A: */
		stype = STYPE_DISKTREE;
		break;
	case 'C':	/* COMM */
		stype = STYPE_DEVICE;
		break;
	case 'I':	/* IPC */
		stype = STYPE_IPC;
		break;
	case 'L':	/* LPT: */
		stype = STYPE_PRINTQ;
		break;
	default:
		stype = STYPE_UNKNOWN;
		break;
	}
	return (stype);
}

int
smb_smb_treeconnect(struct smb_share *ssp, struct smb_cred *scred)
{
	struct smb_vc *vcp;
	struct smb_rq *rqp = NULL;
	struct mbchain *mbp;
	struct mdchain *mdp;
	const char *tname;
	char *pbuf, *unc_name = NULL;
	int error, tlen, plen, unc_len;
	uint16_t bcnt, options;
	uint8_t wc;
	char stype_str[STYPE_LEN];

	vcp = SSTOVC(ssp);

	/*
	 * Make this a "VC-level" request, so it will have
	 * rqp->sr_share == NULL, and smb_iod_sendrq()
	 * will send it with TID = SMB_TID_UNKNOWN
	 *
	 * This also serves to bypass the wait for
	 * share state changes, which this call is
	 * trying to carry out.
	 */
	error = smb_rq_alloc(VCTOCP(vcp), SMB_COM_TREE_CONNECT_ANDX,
	    scred, &rqp);
	if (error)
		return (error);

	/*
	 * Build the UNC name, i.e. "//server/share"
	 * but with backslashes of course.
	 * size math: three slashes, one null.
	 */
	unc_len = 4 + strlen(vcp->vc_srvname) + strlen(ssp->ss_name);
	unc_name = kmem_alloc(unc_len, KM_SLEEP);
	(void) snprintf(unc_name, unc_len, "\\\\%s\\%s",
	    vcp->vc_srvname, ssp->ss_name);
	SMBSDEBUG("unc_name: \"%s\"", unc_name);


	/*
	 * Share-level password (pre-computed in user-space)
	 * MS-SMB 2.2.6 says this should be null terminated,
	 * and the pw length includes the null.
	 */
	pbuf = ssp->ss_pass;
	plen = strlen(pbuf) + 1;

	/*
	 * Build the request.
	 */
	mbp = &rqp->sr_rq;
	smb_rq_wstart(rqp);
	mb_put_uint8(mbp, 0xff);
	mb_put_uint8(mbp, 0);
	mb_put_uint16le(mbp, 0);
	mb_put_uint16le(mbp, 0);		/* Flags */
	mb_put_uint16le(mbp, plen);
	smb_rq_wend(rqp);
	smb_rq_bstart(rqp);

	/* Tree connect password, if any */
	error = mb_put_mem(mbp, pbuf, plen, MB_MSYSTEM);
	if (error)
		goto out;

	/* UNC resource name */
	error = smb_put_dstring(mbp, vcp, unc_name, SMB_CS_NONE);
	if (error)
		goto out;

	/*
	 * Put the type string (always ASCII),
	 * including the null.
	 */
	tname = smb_share_typename(ssp->ss_use);
	tlen = strlen(tname) + 1;
	error = mb_put_mem(mbp, tname, tlen, MB_MSYSTEM);
	if (error)
		goto out;

	smb_rq_bend(rqp);

	/*
	 * Run the request.
	 *
	 * Using NOINTR_RECV because we don't want to risk
	 * missing a successful tree connect response,
	 * which would "leak" Tree IDs.
	 */
	rqp->sr_flags |= SMBR_NOINTR_RECV;
	error = smb_rq_simple(rqp);
	SMBSDEBUG("%d\n", error);
	if (error) {
		/*
		 * If we get the server name wrong, i.e. due to
		 * mis-configured name services, this will be
		 * NT_STATUS_DUPLICATE_NAME.  Log this error.
		 */
		SMBERROR("(%s) failed, status=0x%x",
		    unc_name, rqp->sr_error);
		goto out;
	}

	/*
	 * Parse the TCON response
	 */
	smb_rq_getreply(rqp, &mdp);
	md_get_uint8(mdp, &wc);
	if (wc != 3 && wc != 7) {
		error = EBADRPC;
		goto out;
	}
	md_get_uint16le(mdp, NULL);		/* AndX cmd */
	md_get_uint16le(mdp, NULL);		/* AndX off */
	md_get_uint16le(mdp, &options);		/* option bits (DFS, search) */
	if (wc == 7) {
		md_get_uint32le(mdp, NULL);	/* MaximalShareAccessRights */
		md_get_uint32le(mdp, NULL);	/* GuestMaximalShareAcc... */
	}
	error = md_get_uint16le(mdp, &bcnt);	/* byte count */
	if (error)
		goto out;

	/*
	 * Get the returned share type string, i.e. "IPC" or whatever.
	 * (See smb_share_typename, smb_share_parsetype).  If we get
	 * an error reading the type, just say STYPE_UNKNOWN.
	 */
	tlen = STYPE_LEN;
	bzero(stype_str, tlen--);
	if (tlen > bcnt)
		tlen = bcnt;
	md_get_mem(mdp, stype_str, tlen, MB_MSYSTEM);
	stype_str[tlen] = '\0';
	ssp->ss_type = smb_share_parsetype(stype_str);

	/* Success! */
	SMB_SS_LOCK(ssp);
	ssp->ss_tid = rqp->sr_rptid;
	ssp->ss_vcgenid = vcp->vc_genid;
	ssp->ss_options = options;
	ssp->ss_flags |= SMBS_CONNECTED;
	SMB_SS_UNLOCK(ssp);

out:
	if (unc_name)
		kmem_free(unc_name, unc_len);
	smb_rq_done(rqp);
	return (error);
}

int
smb_smb_treedisconnect(struct smb_share *ssp, struct smb_cred *scred)
{
	struct smb_vc *vcp;
	struct smb_rq *rqp;
	int error;

	if (ssp->ss_tid == SMB_TID_UNKNOWN)
		return (0);

	/*
	 * Build this as a "VC-level" request, so it will
	 * avoid testing the _GONE flag on the share,
	 * which has already been set at this point.
	 * Add the share pointer "by hand" below, so
	 * smb_iod_sendrq will plug in the TID.
	 */
	vcp = SSTOVC(ssp);
	error = smb_rq_alloc(VCTOCP(vcp), SMB_COM_TREE_DISCONNECT, scred, &rqp);
	if (error)
		return (error);
	rqp->sr_share = ssp; /* by hand */

	smb_rq_wstart(rqp);
	smb_rq_wend(rqp);
	smb_rq_bstart(rqp);
	smb_rq_bend(rqp);

	/*
	 * Run this with a relatively short timeout. (5 sec.)
	 * We don't really care about the result here, but we
	 * do need to make sure we send this out, or we could
	 * "leak" active tree IDs on interrupt or timeout.
	 * The NOINTR_SEND flag makes this request immune to
	 * interrupt or timeout until the send is done.
	 * Also, don't reconnect for this, of course!
	 */
	rqp->sr_flags |= (SMBR_NOINTR_SEND | SMBR_NORECONNECT);
	error = smb_rq_simple_timed(rqp, 5);
	SMBSDEBUG("%d\n", error);
	smb_rq_done(rqp);
	ssp->ss_tid = SMB_TID_UNKNOWN;
	return (error);
}

/*
 * Modern create/open of file or directory.
 */
int
smb1_smb_ntcreate(
	struct smb_share *ssp,
	struct mbchain	*name_mb,
	uint32_t cr_flags,	/* create flags */
	uint32_t req_acc,	/* requested access */
	uint32_t efa,		/* ext. file attrs (DOS attr +) */
	uint32_t share_acc,
	uint32_t open_disp,	/* open disposition */
	uint32_t createopt,	/* NTCREATEX_OPTIONS_ */
	uint32_t impersonate,	/* NTCREATEX_IMPERSONATION_... */
	struct smb_cred *scrp,
	uint16_t *fidp,		/* returned FID */
	uint32_t *cr_act_p,	/* optional create action */
	struct smbfattr *fap)	/* optional attributes */
{
	struct smb_rq rq, *rqp = &rq;
	struct smb_vc *vcp = SSTOVC(ssp);
	struct mbchain *mbp;
	struct mdchain *mdp;
	struct smbfattr fa;
	uint64_t llongint;
	uint32_t longint, createact;
	uint16_t fid;
	uint8_t wc;
	int error;

	bzero(&fa, sizeof (fa));
	error = smb_rq_init(rqp, SSTOCP(ssp), SMB_COM_NT_CREATE_ANDX, scrp);
	if (error)
		return (error);
	smb_rq_getrequest(rqp, &mbp);

	/* Word parameters */
	smb_rq_wstart(rqp);
	mb_put_uint8(mbp, 0xff);	/* secondary command */
	mb_put_uint8(mbp, 0);		/* MBZ */
	mb_put_uint16le(mbp, 0);	/* offset to next command (none) */
	mb_put_uint8(mbp, 0);		/* MBZ */
	mb_put_uint16le(mbp, name_mb->mb_count);
	mb_put_uint32le(mbp, cr_flags);	/* NTCREATEX_FLAGS_* */
	mb_put_uint32le(mbp, 0);	/* FID - basis for path if not root */
	mb_put_uint32le(mbp, req_acc);
	mb_put_uint64le(mbp, 0);	/* "initial allocation size" */
	mb_put_uint32le(mbp, efa);
	mb_put_uint32le(mbp, share_acc);
	mb_put_uint32le(mbp, open_disp);
	mb_put_uint32le(mbp, createopt);
	mb_put_uint32le(mbp, impersonate);
	mb_put_uint8(mbp, 0);   /* security flags (?) */
	smb_rq_wend(rqp);

	/*
	 * Byte parameters: Just the path name, aligned.
	 * Note: mb_put_mbuf consumes mb_top, so clear it.
	 */
	smb_rq_bstart(rqp);
	if (SMB_UNICODE_STRINGS(vcp))
		mb_put_padbyte(mbp);
	mb_put_mbuf(mbp, name_mb->mb_top);
	bzero(name_mb, sizeof (*name_mb));
	smb_rq_bend(rqp);

	/*
	 * Don't want to risk missing a successful
	 * open response, or we could "leak" FIDs.
	 */
	rqp->sr_flags |= SMBR_NOINTR_RECV;
	error = smb_rq_simple_timed(rqp, smb_timo_open);
	if (error)
		goto done;
	smb_rq_getreply(rqp, &mdp);
	/*
	 * spec says 26 for word count, but 34 words are defined
	 * and observed from win2000
	 */
	error = md_get_uint8(mdp, &wc);
	if (error)
		goto done;
	if (wc != 26 && wc < 34) {
		error = EBADRPC;
		goto done;
	}
	md_get_uint8(mdp, NULL);		/* secondary cmd */
	md_get_uint8(mdp, NULL);		/* mbz */
	md_get_uint16le(mdp, NULL);		/* andxoffset */
	md_get_uint8(mdp, NULL);		/* oplock lvl granted */
	md_get_uint16le(mdp, &fid);		/* file ID */
	md_get_uint32le(mdp, &createact);	/* create_action */

	md_get_uint64le(mdp, &llongint);	/* creation time */
	smb_time_NT2local(llongint, &fa.fa_createtime);
	md_get_uint64le(mdp, &llongint);	/* access time */
	smb_time_NT2local(llongint, &fa.fa_atime);
	md_get_uint64le(mdp, &llongint);	/* write time */
	smb_time_NT2local(llongint, &fa.fa_mtime);
	md_get_uint64le(mdp, &llongint);	/* change time */
	smb_time_NT2local(llongint, &fa.fa_ctime);

	md_get_uint32le(mdp, &longint);		/* attributes */
	fa.fa_attr = longint;
	md_get_uint64le(mdp, &llongint);	/* allocation size */
	fa.fa_allocsz = llongint;
	md_get_uint64le(mdp, &llongint);	/* EOF position */
	fa.fa_size = llongint;

	error = md_get_uint16le(mdp, NULL);	/* file type */
	/* other stuff we don't care about */

done:
	smb_rq_done(rqp);
	if (error)
		return (error);

	*fidp = fid;
	if (cr_act_p)
		*cr_act_p = createact;
	if (fap)
		*fap = fa; /* struct copy */

	return (0);
}

int
smb1_smb_close(struct smb_share *ssp, uint16_t fid, struct timespec *mtime,
	struct smb_cred *scrp)
{
	struct smb_rq rq, *rqp = &rq;
	struct mbchain *mbp;
	long time;
	int error;

	error = smb_rq_init(rqp, SSTOCP(ssp), SMB_COM_CLOSE, scrp);
	if (error)
		return (error);
	smb_rq_getrequest(rqp, &mbp);
	smb_rq_wstart(rqp);
	mb_put_uint16le(mbp, fid);
	if (mtime) {
		int sv_tz = SSTOVC(ssp)->vc_sopt.sv_tz;
		smb_time_local2server(mtime, sv_tz, &time);
	} else {
		time = 0;
	}
	mb_put_uint32le(mbp, time);
	smb_rq_wend(rqp);
	smb_rq_bstart(rqp);
	smb_rq_bend(rqp);

	/* Make sure we send, but only if already connected */
	rqp->sr_flags |= (SMBR_NOINTR_SEND | SMBR_NORECONNECT);
	error = smb_rq_simple(rqp);
	smb_rq_done(rqp);
	return (error);
}

int
smb_smb_open_prjob(
	struct smb_share *ssp,
	char	*title,
	uint16_t setuplen,
	uint16_t mode,
	struct smb_cred *scrp,
	uint16_t *fidp)
{
	struct smb_rq rq, *rqp = &rq;
	struct smb_vc *vcp = SSTOVC(ssp);
	struct mbchain *mbp;
	struct mdchain *mdp;
	uint16_t fid;
	uint8_t wc;
	int error;

	error = smb_rq_init(rqp, SSTOCP(ssp), SMB_COM_OPEN_PRINT_FILE, scrp);
	if (error)
		return (error);
	smb_rq_getrequest(rqp, &mbp);

	/* Word parameters */
	smb_rq_wstart(rqp);
	mb_put_uint16le(mbp, setuplen);
	mb_put_uint16le(mbp, mode);
	smb_rq_wend(rqp);

	/*
	 * Byte parameters: Just the title
	 */
	smb_rq_bstart(rqp);
	mb_put_uint8(mbp, SMB_DT_ASCII);
	error = smb_put_dstring(mbp, vcp, title, SMB_CS_NONE);
	smb_rq_bend(rqp);
	if (error)
		goto done;

	/*
	 * Don't want to risk missing a successful
	 * open response, or we could "leak" FIDs.
	 */
	rqp->sr_flags |= SMBR_NOINTR_RECV;
	error = smb_rq_simple_timed(rqp, smb_timo_open);
	if (error)
		goto done;

	smb_rq_getreply(rqp, &mdp);
	error = md_get_uint8(mdp, &wc);
	if (error || wc < 1) {
		error = EBADRPC;
		goto done;
	}
	error = md_get_uint16le(mdp, &fid);

done:
	smb_rq_done(rqp);
	if (error)
		return (error);

	*fidp = fid;
	return (0);
}

/*
 * Like smb_smb_close, but for print shares.
 */
int
smb_smb_close_prjob(struct smb_share *ssp, uint16_t fid,
	struct smb_cred *scrp)
{
	struct smb_rq rq, *rqp = &rq;
	struct mbchain *mbp;
	int error;

	error = smb_rq_init(rqp, SSTOCP(ssp),
	    SMB_COM_CLOSE_PRINT_FILE, scrp);
	if (error)
		return (error);
	smb_rq_getrequest(rqp, &mbp);
	smb_rq_wstart(rqp);
	mb_put_uint16le(mbp, fid);
	smb_rq_wend(rqp);
	smb_rq_bstart(rqp);
	smb_rq_bend(rqp);

	/* Make sure we send but only if already connected */
	rqp->sr_flags |= (SMBR_NOINTR_SEND | SMBR_NORECONNECT);
	error = smb_rq_simple(rqp);
	smb_rq_done(rqp);
	return (error);
}

int
smb_smb_readx(smb_fh_t *fhp, uint32_t *lenp,
	uio_t *uiop, smb_cred_t *scred, int timo)
{
	struct smb_share *ssp = FHTOSS(fhp);
	struct smb_rq *rqp;
	struct mbchain *mbp;
	struct mdchain *mdp;
	int error;
	uint32_t offlo, offhi, rlen;
	uint16_t lenhi, lenlo, off, doff;
	uint8_t wc;

	lenhi = (uint16_t)(*lenp >> 16);
	lenlo = (uint16_t)*lenp;
	offhi = (uint32_t)(uiop->uio_loffset >> 32);
	offlo = (uint32_t)uiop->uio_loffset;

	error = smb_rq_alloc(SSTOCP(ssp), SMB_COM_READ_ANDX, scred, &rqp);
	if (error)
		return (error);
	smb_rq_getrequest(rqp, &mbp);
	smb_rq_wstart(rqp);
	mb_put_uint8(mbp, 0xff);	/* no secondary command */
	mb_put_uint8(mbp, 0);		/* MBZ */
	mb_put_uint16le(mbp, 0);	/* offset to secondary */
	mb_put_uint16le(mbp, fhp->fh_fid1);
	mb_put_uint32le(mbp, offlo);	/* offset (low part) */
	mb_put_uint16le(mbp, lenlo);	/* MaxCount */
	mb_put_uint16le(mbp, 1);	/* MinCount */
					/* (only indicates blocking) */
	mb_put_uint32le(mbp, lenhi);	/* MaxCountHigh */
	mb_put_uint16le(mbp, lenlo);	/* Remaining ("obsolete") */
	mb_put_uint32le(mbp, offhi);	/* offset (high part) */
	smb_rq_wend(rqp);
	smb_rq_bstart(rqp);
	smb_rq_bend(rqp);

	if (timo == 0)
		timo = smb_timo_read;
	error = smb_rq_simple_timed(rqp, timo);
	if (error)
		goto out;

	smb_rq_getreply(rqp, &mdp);
	error = md_get_uint8(mdp, &wc);
	if (error)
		goto out;
	if (wc != 12) {
		error = EBADRPC;
		goto out;
	}
	md_get_uint8(mdp, NULL);
	md_get_uint8(mdp, NULL);
	md_get_uint16le(mdp, NULL);
	md_get_uint16le(mdp, NULL);
	md_get_uint16le(mdp, NULL);	/* data compaction mode */
	md_get_uint16le(mdp, NULL);
	md_get_uint16le(mdp, &lenlo);	/* data len ret. */
	md_get_uint16le(mdp, &doff);	/* data offset */
	md_get_uint16le(mdp, &lenhi);
	rlen = (lenhi << 16) | lenlo;
	md_get_mem(mdp, NULL, 4 * 2, MB_MSYSTEM);
	error = md_get_uint16le(mdp, NULL);	/* ByteCount */
	if (error)
		goto out;
	/*
	 * Does the data offset indicate padding?
	 * The current offset is a constant, found
	 * by counting the md_get_ calls above.
	 */
	off = SMB_HDRLEN + 3 + (12 * 2); /* =59 */
	if (doff > off)	/* pad byte(s)? */
		md_get_mem(mdp, NULL, doff - off, MB_MSYSTEM);
	if (rlen == 0) {
		*lenp = rlen;
		goto out;
	}
	/* paranoid */
	if (rlen > *lenp) {
		SMBSDEBUG("bad server! rlen %d, len %d\n",
		    rlen, *lenp);
		rlen = *lenp;
	}
	error = md_get_uio(mdp, uiop, rlen);
	if (error)
		goto out;

	/* Success */
	*lenp = rlen;

out:
	smb_rq_done(rqp);
	return (error);
}

int
smb_smb_writex(smb_fh_t *fhp, uint32_t *lenp,
	uio_t *uiop, smb_cred_t *scred, int timo)
{
	struct smb_share *ssp = FHTOSS(fhp);
	struct smb_rq *rqp;
	struct mbchain *mbp;
	struct mdchain *mdp;
	int error;
	uint32_t offlo, offhi, rlen;
	uint16_t lenhi, lenlo;
	uint8_t wc;

	lenhi = (uint16_t)(*lenp >> 16);
	lenlo = (uint16_t)*lenp;
	offhi = (uint32_t)(uiop->uio_loffset >> 32);
	offlo = (uint32_t)uiop->uio_loffset;

	error = smb_rq_alloc(SSTOCP(ssp), SMB_COM_WRITE_ANDX, scred, &rqp);
	if (error)
		return (error);
	smb_rq_getrequest(rqp, &mbp);
	smb_rq_wstart(rqp);
	mb_put_uint8(mbp, 0xff);	/* no secondary command */
	mb_put_uint8(mbp, 0);		/* MBZ */
	mb_put_uint16le(mbp, 0);	/* offset to secondary */
	mb_put_uint16le(mbp, fhp->fh_fid1);
	mb_put_uint32le(mbp, offlo);	/* offset (low part) */
	mb_put_uint32le(mbp, 0);	/* MBZ (timeout) */
	mb_put_uint16le(mbp, 0);	/* !write-thru */
	mb_put_uint16le(mbp, 0);
	mb_put_uint16le(mbp, lenhi);
	mb_put_uint16le(mbp, lenlo);
	mb_put_uint16le(mbp, 64);	/* data offset from header start */
	mb_put_uint32le(mbp, offhi);	/* offset (high part) */
	smb_rq_wend(rqp);
	smb_rq_bstart(rqp);

	mb_put_uint8(mbp, 0);	/* pad byte */
	error = mb_put_uio(mbp, uiop, *lenp);
	if (error)
		goto out;
	smb_rq_bend(rqp);
	if (timo == 0)
		timo = smb_timo_write;
	error = smb_rq_simple_timed(rqp, timo);
	if (error)
		goto out;
	smb_rq_getreply(rqp, &mdp);
	error = md_get_uint8(mdp, &wc);
	if (error)
		goto out;
	if (wc != 6) {
		error = EBADRPC;
		goto out;
	}
	md_get_uint8(mdp, NULL);	/* andx cmd */
	md_get_uint8(mdp, NULL);	/* reserved */
	md_get_uint16le(mdp, NULL);	/* andx offset */
	md_get_uint16le(mdp, &lenlo);	/* data len ret. */
	md_get_uint16le(mdp, NULL);	/* remaining */
	error = md_get_uint16le(mdp, &lenhi);
	if (error)
		goto out;

	/* Success */
	rlen = (lenhi << 16) | lenlo;
	*lenp = rlen;

out:
	smb_rq_done(rqp);
	return (error);
}


static u_int32_t	smbechoes = 0;

/*
 * Note: the IOD calls this, so this request must not wait for
 * connection state changes, etc. (uses smb_rq_internal)
 */
int
smb_smb_echo(struct smb_vc *vcp, struct smb_cred *scred, int timo)
{
	struct smb_rq *rqp;
	struct mbchain *mbp;
	int error;

	error = smb_rq_alloc(VCTOCP(vcp), SMB_COM_ECHO, scred, &rqp);
	if (error)
		return (error);
	mbp = &rqp->sr_rq;
	smb_rq_wstart(rqp);
	mb_put_uint16le(mbp, 1); /* echo count */
	smb_rq_wend(rqp);
	smb_rq_bstart(rqp);
	mb_put_uint32le(mbp, atomic_inc_32_nv(&smbechoes));
	smb_rq_bend(rqp);
	rqp->sr_flags |= SMBR_NORECONNECT;
	error = smb_rq_internal(rqp, timo);
	SMBSDEBUG("%d\n", error);
	smb_rq_done(rqp);
	return (error);
}