xref: /illumos-gate/usr/src/cmd/fs.d/smbclnt/mount/mount.c (revision 0463c800)

/*
 * 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: mount_smbfs.c,v 1.28.44.2 2005/06/02 00:55:41 lindak Exp $
 */

/*
 * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright 2019 Nexenta by DDN, Inc. All rights reserved.
 */

#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <pwd.h>
#include <grp.h>
#include <unistd.h>
#include <ctype.h>
#include <stdlib.h>
#include <errno.h>
#include <err.h>
#include <libintl.h>
#include <locale.h>
#include <libscf.h>
#include <priv_utils.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/errno.h>
#include <sys/mount.h>
#include <sys/mntent.h>
#include <sys/mnttab.h>

#include <sys/fs/smbfs_mount.h>

/* This needs to know ctx->ct_dev_fd, etc. */
#include <netsmb/smb_lib.h>

extern char *optarg;
extern int optind;

static char mount_point[MAXPATHLEN + 1];
static void usage(void);
static int setsubopt(smb_ctx_t *, struct smbfs_args *, char *);

const char * const optlist[] = {

	/* Generic VFS options. */
#define	OPT_RO		0
	MNTOPT_RO,
#define	OPT_RW		1
	MNTOPT_RW,
#define	OPT_SUID	2
	MNTOPT_SUID,
#define	OPT_NOSUID	3
	MNTOPT_NOSUID,
#define	OPT_DEVICES	4
	MNTOPT_DEVICES,
#define	OPT_NODEVICES	5
	MNTOPT_NODEVICES,
#define	OPT_SETUID	6
	MNTOPT_SETUID,
#define	OPT_NOSETUID	7
	MNTOPT_NOSETUID,
#define	OPT_EXEC	8
	MNTOPT_EXEC,
#define	OPT_NOEXEC	9
	MNTOPT_NOEXEC,
#define	OPT_XATTR	10
	MNTOPT_XATTR,
#define	OPT_NOXATTR	11
	MNTOPT_NOXATTR,

	/* Sort of generic (from NFS) */
#define	OPT_NOAC	12
	MNTOPT_NOAC,
#define	OPT_ACTIMEO	13
	MNTOPT_ACTIMEO,
#define	OPT_ACREGMIN	14
	MNTOPT_ACREGMIN,
#define	OPT_ACREGMAX	15
	MNTOPT_ACREGMAX,
#define	OPT_ACDIRMIN	16
	MNTOPT_ACDIRMIN,
#define	OPT_ACDIRMAX	17
	MNTOPT_ACDIRMAX,

	/* smbfs-specifis options */
#define	OPT_DOMAIN	18
	"domain",
#define	OPT_USER	19
	"user",
#define	OPT_UID		20
	"uid",
#define	OPT_GID		21
	"gid",
#define	OPT_DIRPERMS	22
	"dirperms",
#define	OPT_FILEPERMS	23
	"fileperms",
#define	OPT_NOPROMPT	24
	"noprompt",
#define	OPT_ACL		25
	MNTOPT_ACL,
#define	OPT_NOACL	26
	MNTOPT_NOACL,

	NULL
};

static int Oflg = 0;    /* Overlay mounts */
static int qflg = 0;    /* quiet - don't print warnings on bad options */
static int noprompt = 0;	/* don't prompt for password */

/* Note: smbfs uses _both_ kinds of options. */
static int mntflags = MS_DATA | MS_OPTIONSTR;

#define	EX_OK	0	/* normal */
#define	EX_OPT	1	/* bad options, usage, etc */
#define	EX_MNT	2	/* mount point problems, etc */
#define	RET_ERR	3	/* later errors */

#define	SERVICE "svc:/network/smb/client:default"

struct smbfs_args mdata;
struct mnttab mnt;

/*
 * Initialize this with "rw" just to have something there,
 * so we don't have to decide whether to add a comma when
 * we strcat another option.  Note the "rw" may be changed
 * to an "ro" by option processing.
 */
char optbuf[MAX_MNTOPT_STR] = "rw";
char special[MAXPATHLEN];

int
main(int argc, char *argv[])
{
	struct smb_ctx *ctx = NULL;
	struct stat st;
	int opt, error, err2;
	static char *fstype = MNTTYPE_SMBFS;
	char *env;

	(void) setlocale(LC_ALL, "");
#if !defined(TEXT_DOMAIN)
#define	TEXT_DOMAIN	"SYS_TEST"
#endif
	(void) textdomain(TEXT_DOMAIN);

	/*
	 * Normal users are allowed to run "mount -F smbfs ..."
	 * to mount on a directory they own.  To allow that, this
	 * program has an exec_attr that adds SYS_MOUNT priv.
	 *
	 * The __init_suid_priv call was designed for SUID programs,
	 * but also works for privileges granted via exec_attr with
	 * one difference: the added privileges are already effective
	 * when the program starts, and remain effective after the call.
	 * To make this work more like the SUID case we'll turn off the
	 * additional privileges with a __priv_bracket() call here.
	 * Later calls to __priv_bracket() make the extra privileges
	 * effective only when we need them.
	 */
	if (__init_suid_priv(0, PRIV_SYS_MOUNT, (char *)NULL) < 0) {
		(void) fprintf(stderr,
		    gettext("Insufficient privileges, "
		    "%s should have sys_mount privilege via exec_attr\n"),
		    argv[0]);
		exit(RET_ERR);
	}
	(void) __priv_bracket(PRIV_OFF);

	if (argc == 2) {
		if (strcmp(argv[1], "-h") == 0) {
			usage();
		} else if (strcmp(argv[1], "-v") == 0) {
			errx(EX_OK, gettext("version %d.%d.%d"),
			    SMBFS_VERSION / 100000,
			    (SMBFS_VERSION % 10000) / 1000,
			    (SMBFS_VERSION % 1000) / 100);
		}
	}
	if (argc < 3)
		usage();

	/* Debugging support. */
	if ((env = getenv("SMBFS_DEBUG")) != NULL) {
		smb_debug = atoi(env);
		if (smb_debug < 1)
			smb_debug = 1;
	}

	error = smb_lib_init();
	if (error)
		exit(RET_ERR);

	mnt.mnt_mntopts = optbuf;

	bzero(&mdata, sizeof (mdata));
	mdata.version = SMBFS_VERSION;		/* smbfs mount version */
	mdata.uid = (uid_t)-1;
	mdata.gid = (gid_t)-1;

	error = smb_ctx_alloc(&ctx);
	if (error)
		exit(RET_ERR);

	/*
	 * Parse the UNC path so we have the server (etc.)
	 * that we need during rcfile+sharectl parsing.
	 */
	if (argc < 3)
		usage();
	error = smb_ctx_parseunc(ctx, argv[argc - 2],
	    SMBL_SHARE, SMBL_SHARE, USE_DISKDEV, NULL);
	if (error)
		exit(EX_OPT);

	error = smb_ctx_readrc(ctx);
	if (error)
		exit(EX_OPT);

	while ((opt = getopt(argc, argv, "ro:Oq")) != -1) {
		switch (opt) {
		case 'O':
			Oflg++;
			break;

		case 'q':
			qflg++;
			break;

		case 'r':
			mntflags |= MS_RDONLY;
			break;

		case 'o': {
			char *nextopt, *comma, *sopt;
			int ret;

			for (sopt = optarg; sopt != NULL; sopt = nextopt) {
				comma = strchr(sopt, ',');
				if (comma) {
					nextopt = comma + 1;
					*comma = '\0';
				} else
					nextopt = NULL;
				ret = setsubopt(ctx, &mdata, sopt);
				if (ret != 0)
					exit(EX_OPT);
				/* undo changes to optarg */
				if (comma)
					*comma = ',';
			}
			break;
		}

		case '?':
		default:
			usage();
		}
	}

	if (Oflg)
		mntflags |= MS_OVERLAY;

	if (mntflags & MS_RDONLY) {
		char *p;
		/* convert "rw"->"ro" */
		if (p = strstr(optbuf, "rw")) {
			if (*(p+2) == ',' || *(p+2) == '\0')
				*(p+1) = 'o';
		}
	}

	if (optind + 2 != argc)
		usage();

	(void) snprintf(special, sizeof (special), "//%s/%s",
	    ctx->ct_fullserver, ctx->ct_origshare);

	mnt.mnt_special = special;
	mnt.mnt_mountp = argv[optind+1];

	if ((realpath(argv[optind+1], mount_point) == NULL) ||
	    (stat(mount_point, &st) == -1)) {
		err(EX_MNT, gettext("could not find mount point %s"),
		    argv[optind+1]);
	}
	if (!S_ISDIR(st.st_mode)) {
		errno = ENOTDIR;
		err(EX_MNT, gettext("can't mount on %s"), mount_point);
	}

	/*
	 * Fill in mdata defaults.
	 */
	if (mdata.uid == (uid_t)-1)
		mdata.uid = getuid();
	if (mdata.gid == (gid_t)-1)
		mdata.gid = getgid();
	if (mdata.file_mode == 0)
		mdata.file_mode = S_IRWXU;
	if (mdata.dir_mode == 0) {
		mdata.dir_mode = mdata.file_mode;
		if (mdata.dir_mode & S_IRUSR)
			mdata.dir_mode |= S_IXUSR;
		if (mdata.dir_mode & S_IRGRP)
			mdata.dir_mode |= S_IXGRP;
		if (mdata.dir_mode & S_IROTH)
			mdata.dir_mode |= S_IXOTH;
	}

	ctx->ct_ssn.ssn_owner = SMBM_ANY_OWNER;
	if (noprompt)
		ctx->ct_flags |= SMBCF_NOPWD;

	/*
	 * Resolve the server address,
	 * setup derived defaults.
	 */
	error = smb_ctx_resolve(ctx);
	if (error)
		exit(RET_ERR);

	/*
	 * Have server, share, etc. from above:
	 * smb_ctx_scan_argv, option settings.
	 * Get the session and tree.
	 */
again:
	error = smb_ctx_get_ssn(ctx);
	if (error == EAUTH && noprompt == 0) {
		err2 = smb_get_authentication(ctx);
		if (err2 == 0)
			goto again;
	}
	if (error) {
		smb_error(gettext("//%s: login failed"),
		    error, ctx->ct_fullserver);
		exit(RET_ERR);
	}

	error = smb_ctx_get_tree(ctx);
	if (error) {
		smb_error(gettext("//%s/%s: tree connect failed"),
		    error, ctx->ct_fullserver, ctx->ct_origshare);
		exit(RET_ERR);
	}

	/*
	 * Have tree connection, now mount it.
	 */
	mdata.devfd = ctx->ct_dev_fd;

	/* Need sys_mount privilege for the mount call. */
	(void) __priv_bracket(PRIV_ON);
	err2 = mount(mnt.mnt_special, mnt.mnt_mountp,
	    mntflags, fstype, &mdata, sizeof (mdata),
	    mnt.mnt_mntopts, MAX_MNTOPT_STR);
	(void) __priv_bracket(PRIV_OFF);

	if (err2 < 0) {
		if (errno != ENOENT) {
			err(EX_MNT, gettext("mount_smbfs: %s"),
			    mnt.mnt_mountp);
		} else {
			struct stat sb;
			if (stat(mnt.mnt_mountp, &sb) < 0 &&
			    errno == ENOENT)
				err(EX_MNT, gettext("mount_smbfs: %s"),
				    mnt.mnt_mountp);
			else
				err(EX_MNT, gettext("mount_smbfs: %s"),
				    mnt.mnt_special);
		}
	}

	smb_ctx_free(ctx);
	return (0);
}

#define	bad(val) (val == NULL || !isdigit(*val))

int
setsubopt(smb_ctx_t *ctx, struct smbfs_args *mdatap, char *subopt)
{
	char *equals, *optarg;
	struct passwd *pwd;
	struct group *grp;
	long val;
	int rc = EX_OK;
	int index;
	char *p;

	equals = strchr(subopt, '=');
	if (equals) {
		*equals = '\0';
		optarg = equals + 1;
	} else
		optarg = NULL;

	for (index = 0; optlist[index] != NULL; index++) {
		if (strcmp(subopt, optlist[index]) == 0)
			break;
	}

	/*
	 * Note: if the option was unknown, index will
	 * point to the NULL at the end of optlist[],
	 * and we'll take the switch default.
	 */

	switch (index) {

	case OPT_ACL:
	case OPT_NOACL:
	case OPT_SUID:
	case OPT_NOSUID:
	case OPT_DEVICES:
	case OPT_NODEVICES:
	case OPT_SETUID:
	case OPT_NOSETUID:
	case OPT_EXEC:
	case OPT_NOEXEC:
	case OPT_XATTR:
	case OPT_NOXATTR:
		/*
		 * These options are handled via the
		 * generic option string mechanism.
		 * None of these take an optarg.
		 */
		if (optarg != NULL)
			goto badval;
		(void) strlcat(optbuf, ",", sizeof (optbuf));
		if (strlcat(optbuf, subopt, sizeof (optbuf)) >=
		    sizeof (optbuf)) {
			if (!qflg)
				warnx(gettext("option string too long"));
			rc = EX_OPT;
		}
		break;

	/*
	 * OPT_RO, OPT_RW, are actually generic too,
	 * but we use the mntflags for these, and
	 * then update the options string later.
	 */
	case OPT_RO:
		mntflags |= MS_RDONLY;
		break;
	case OPT_RW:
		mntflags &= ~MS_RDONLY;
		break;

	/*
	 * NFS-derived options for attribute cache
	 * handling (disable, set min/max timeouts)
	 */
	case OPT_NOAC:
		mdatap->flags |= SMBFS_MF_NOAC;
		break;

	case OPT_ACTIMEO:
		errno = 0;
		val = strtol(optarg, &p, 10);
		if (errno || *p != 0)
			goto badval;
		mdatap->acdirmin = mdatap->acregmin = val;
		mdatap->acdirmax = mdatap->acregmax = val;
		mdatap->flags |= SMBFS_MF_ACDIRMAX;
		mdatap->flags |= SMBFS_MF_ACREGMAX;
		mdatap->flags |= SMBFS_MF_ACDIRMIN;
		mdatap->flags |= SMBFS_MF_ACREGMIN;
		break;

	case OPT_ACREGMIN:
		errno = 0;
		val = strtol(optarg, &p, 10);
		if (errno || *p != 0)
			goto badval;
		mdatap->acregmin = val;
		mdatap->flags |= SMBFS_MF_ACREGMIN;
		break;

	case OPT_ACREGMAX:
		errno = 0;
		val = strtol(optarg, &p, 10);
		if (errno || *p != 0)
			goto badval;
		mdatap->acregmax = val;
		mdatap->flags |= SMBFS_MF_ACREGMAX;
		break;

	case OPT_ACDIRMIN:
		errno = 0;
		val = strtol(optarg, &p, 10);
		if (errno || *p != 0)
			goto badval;
		mdatap->acdirmin = val;
		mdatap->flags |= SMBFS_MF_ACDIRMIN;
		break;

	case OPT_ACDIRMAX:
		errno = 0;
		val = strtol(optarg, &p, 10);
		if (errno || *p != 0)
			goto badval;
		mdatap->acdirmax = val;
		mdatap->flags |= SMBFS_MF_ACDIRMAX;
		break;

	/*
	 * SMBFS-specific options.  Some of these
	 * don't go through the mount system call,
	 * but just set libsmbfs options.
	 */
	case OPT_DOMAIN:
		if (smb_ctx_setdomain(ctx, optarg, B_TRUE) != 0)
			rc = EX_OPT;
		break;

	case OPT_USER:
		if (smb_ctx_setuser(ctx, optarg, B_TRUE) != 0)
			rc = EX_OPT;
		break;

	case OPT_UID:
		pwd = isdigit(optarg[0]) ?
		    getpwuid(atoi(optarg)) : getpwnam(optarg);
		if (pwd == NULL) {
			if (!qflg)
				warnx(gettext("unknown user '%s'"), optarg);
			rc = EX_OPT;
		} else {
			mdatap->uid = pwd->pw_uid;
		}
		break;

	case OPT_GID:
		grp = isdigit(optarg[0]) ?
		    getgrgid(atoi(optarg)) : getgrnam(optarg);
		if (grp == NULL) {
			if (!qflg)
				warnx(gettext("unknown group '%s'"), optarg);
			rc = EX_OPT;
		} else {
			mdatap->gid = grp->gr_gid;
		}
		break;

	case OPT_DIRPERMS:
		errno = 0;
		val = strtol(optarg, &p, 8);
		if (errno || *p != 0)
			goto badval;
		mdatap->dir_mode = val;
		break;

	case OPT_FILEPERMS:
		errno = 0;
		val = strtol(optarg, &p, 8);
		if (errno || *p != 0)
			goto badval;
		mdatap->file_mode = val;
		break;

	case OPT_NOPROMPT:
		noprompt++;
		break;

	default:
	badopt:
		if (!qflg)
			warnx(gettext("unknown option %s"), subopt);
		rc = EX_OPT;
		break;

	badval:
		if (!qflg)
			warnx(gettext("invalid value for %s"), subopt);
		rc = EX_OPT;
		break;
	}

	/* Undo changes made to subopt */
	if (equals)
		*equals = '=';

	return (rc);
}

static void
usage(void)
{
	(void) fprintf(stderr, "%s\n",
	gettext("usage: mount -F smbfs [-Orq] [-o option[,option]]"
	"	//[workgroup;][user[:password]@]server[/share] path"));

	exit(EX_OPT);
}