libsmbfs/common/smbfs_door.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <strings.h>
#include <fcntl.h>
#include <unistd.h>
#include <libnvpair.h>
#include <door.h>
#include <errno.h>
#include <sys/mman.h>
#include <alloca.h>

#include <netsmb/smb_dev.h>
#include "smbfs_lib.h"

static int smbfs_door_encode(int, smbfs_passwd_t *, char **, size_t *);
static int smbfs_door_call(char *, size_t, door_arg_t *);

/*
 * Request the creation of our per-user smbiod
 * via door call to the "main" IOD service.
 */
int
smbfs_iod_start(void)
{
    door_arg_t da;
    char *buf = NULL;
    size_t buflen;
    int err;
    int32_t rc;

    if ((err = smbfs_door_encode(SMBIOD_START, NULL, &buf, &buflen)) != 0)
        return (err);

    bzero(&da, sizeof (door_arg_t));
    da.rbuf = (void *) &rc;
    da.rsize = sizeof (rc);

    if ((err = smbfs_door_call(buf, buflen, &da)) != 0) {
        free(buf);
        return (err);
    }
    free(buf);

    return (rc);
}

/*
 * Adds passwd info to the smbfspasswd file.
 */
int
smbfs_iod_pwdadd(smbfs_passwd_t *pwdinfo)
{
    door_arg_t da;
    char *buf = NULL;
    size_t buflen;
    int err;
    int32_t rc;

    if (pwdinfo == NULL)
        return (EINVAL);

    if ((err = smbfs_door_encode(SMBIOD_PWDFILE_ADD, pwdinfo,
        &buf, &buflen)) != 0)
        return (err);

    bzero(&da, sizeof (door_arg_t));
    da.rbuf = (void *) &rc;
    da.rsize = sizeof (rc);

    if ((err = smbfs_door_call(buf, buflen, &da)) != 0) {
        free(buf);
        return (err);
    }
    free(buf);

    return (rc);
}

/*
 * Removes passwd info(s) from the smbfspasswd file.  If pwdinfo is NULL,
 * removes all passwd info for the same user ID.
 */
int
smbfs_iod_pwddel(smbfs_passwd_t *pwdinfo)
{
    door_arg_t da;
    char *buf = NULL;
    size_t buflen;
    int err, cmd;
    int32_t rc;

    if (pwdinfo == NULL)
        cmd = SMBIOD_PWDFILE_DELALL;
    else
        cmd = SMBIOD_PWDFILE_DEL;

    if ((err = smbfs_door_encode(cmd, pwdinfo, &buf, &buflen)) != 0)
        return (err);

    bzero(&da, sizeof (door_arg_t));
    da.rbuf = (void *) &rc;
    da.rsize = sizeof (rc);

    if ((err = smbfs_door_call(buf, buflen, &da)) != 0) {
        free(buf);
        return (err);
    }
    free(buf);

    return (rc);
}

/*
 * Decodes the door call arguments which is encoded in a buffer via
 * nvlist_pack().  The packed data contains the command and may contain
 * password info.
 *
 * Returns the command and password info if a buffer is supplied to store
 * the password info.
 */
int
smbfs_door_decode(char *buf, size_t buflen, int *cmd, smbfs_passwd_t *pwdinfo)
{
    nvlist_t *nvl;
    uint8_t *lm, *nt;
    uint_t lm_sz, nt_sz;
    char *dom, *usr;
    int err;

    if ((err = nvlist_unpack(buf, buflen, &nvl, 0)) != 0)
        return (err);

    if ((err = nvlist_lookup_int32(nvl, "cmd", cmd)) != 0) {
        nvlist_free(nvl);
        return (err);
    }

    if (pwdinfo != NULL) {
        if ((nvlist_lookup_string(nvl, "dom", &dom) != 0) ||
            (nvlist_lookup_string(nvl, "usr", &usr) != 0) ||
            (nvlist_lookup_uint8_array(nvl, "lm", &lm, &lm_sz) != 0) ||
            (nvlist_lookup_uint8_array(nvl, "nt", &nt, &nt_sz) != 0)) {
            nvlist_free(nvl);
            return (EINVAL);
        }

        (void) strlcpy(pwdinfo->pw_dom, dom, sizeof (pwdinfo->pw_dom));
        (void) strlcpy(pwdinfo->pw_usr, usr, sizeof (pwdinfo->pw_usr));
        (void) bcopy(lm, pwdinfo->pw_lmhash, lm_sz);
        (void) bcopy(nt, pwdinfo->pw_nthash, nt_sz);
    }

    nvlist_free(nvl);
    return (0);
}

/*
 * Encodes the door arguments, the command and password info, if supplied.
 *
 * To have the nvpair library allocate memory for the pack data, the caller
 * should set the buf pointer to NULL.  The memory then should be freed by
 * the caller.
 */
static int
smbfs_door_encode(int cmd, smbfs_passwd_t *pwdinfo, char **buf, size_t *buflen)
{
    nvlist_t *nvl;
    int err;
    smbfs_passwd_t newpwd, *pwdinfop;

    if ((err = nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0)) != 0)
        return (err);

    if (pwdinfo == NULL) {
        bzero(&newpwd, sizeof (newpwd));
        pwdinfop = &newpwd;
    } else {
        pwdinfop = pwdinfo;
    }

    if ((nvlist_add_int32(nvl, "cmd", cmd) != 0) ||
        (nvlist_add_string(nvl, "dom", pwdinfop->pw_dom) != 0) ||
        (nvlist_add_string(nvl, "usr", pwdinfop->pw_usr) != 0) ||
        (nvlist_add_uint8_array(nvl, "lm", pwdinfop->pw_lmhash,
        SMBIOC_HASH_SZ) != 0) ||
        (nvlist_add_uint8_array(nvl, "nt", pwdinfop->pw_nthash,
        SMBIOC_HASH_SZ) != 0)) {
        nvlist_free(nvl);
        return (EINVAL);
    }

    if ((err = nvlist_size(nvl, buflen, NV_ENCODE_XDR)) != 0) {
        nvlist_free(nvl);
        return (err);
    }

    err = nvlist_pack(nvl, buf, buflen, NV_ENCODE_XDR, 0);

    nvlist_free(nvl);
    return (err);
}

static int
smbfs_door_call(char *buf, size_t buflen, door_arg_t *da)
{
    const char *svc_door = SMBIOD_SVC_DOOR;
    int32_t err;
    int fd, rc;

    fd = open(svc_door, O_RDONLY, 0);
    if (fd < 0) {
        err = errno;
        return (err);
    }
    da->data_ptr = (void *) buf;
    da->data_size = buflen;
    rc = door_call(fd, da);
    (void) close(fd);
    if (rc < 0) {
        err = errno;
        return (err);
    }

    return (0);
}