fs/smbsrv/smb_cred.c

	smb_cred.c revision 12b65585e720714b31036daaa2b30eb76014048e
/*
 * 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) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright 2014 Nexenta Systems, Inc.  All rights reserved.
 */

/*
 * Authentication helpers for building credentials
 */

#include <sys/types.h>
#include <sys/sid.h>
#include <sys/priv_names.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <smbsrv/smb_idmap.h>
#include <smbsrv/smb_kproto.h>
#include <smbsrv/smb_token.h>

static void smb_cred_set_sid(smb_id_t *id, ksid_t *ksid);
static ksidlist_t *smb_cred_set_sidlist(smb_ids_t *token_grps);

/*
 * Allocate a Solaris cred and initialize it based on the access token.
 *
 * If the user can be mapped to a non-ephemeral ID, the cred gid is set
 * to the Solaris user's primary group.
 *
 * If the mapped UID is ephemeral, or the primary group could not be
 * obtained, the cred gid is set to whatever Solaris group is mapped
 * to the token's primary group.
 */
cred_t *
smb_cred_create(smb_token_t *token)
{
    ksid_t          ksid;
    ksidlist_t      *ksidlist = NULL;
    smb_posix_grps_t    *posix_grps;
    cred_t          *cr;
    gid_t           gid;

    ASSERT(token);
    ASSERT(token->tkn_posix_grps);
    posix_grps = token->tkn_posix_grps;

    cr = crget();
    ASSERT(cr != NULL);

    if (!IDMAP_ID_IS_EPHEMERAL(token->tkn_user.i_id) &&
        (posix_grps->pg_ngrps != 0)) {
        gid = posix_grps->pg_grps[0];
    } else {
        gid = token->tkn_primary_grp.i_id;
    }

    if (crsetugid(cr, token->tkn_user.i_id, gid) != 0) {
        crfree(cr);
        return (NULL);
    }

    if (crsetgroups(cr, posix_grps->pg_ngrps, posix_grps->pg_grps) != 0) {
        crfree(cr);
        return (NULL);
    }

    smb_cred_set_sid(&token->tkn_user, &ksid);
    crsetsid(cr, &ksid, KSID_USER);
    smb_cred_set_sid(&token->tkn_primary_grp, &ksid);
    crsetsid(cr, &ksid, KSID_GROUP);
    smb_cred_set_sid(&token->tkn_owner, &ksid);
    crsetsid(cr, &ksid, KSID_OWNER);
    ksidlist = smb_cred_set_sidlist(&token->tkn_win_grps);
    crsetsidlist(cr, ksidlist);

    /*
     * In the AD world, "take ownership privilege" is very much
     * like having Unix "root" privileges.  It's normally given
     * to members of the "Administrators" group, which normally
     * includes the the local Administrator (like root) and when
     * joined to a domain, "Domain Admins".
     */
    if (smb_token_query_privilege(token, SE_TAKE_OWNERSHIP_LUID)) {
        (void) crsetpriv(cr,
            PRIV_FILE_CHOWN,
            PRIV_FILE_DAC_READ,
            PRIV_FILE_DAC_SEARCH,
            PRIV_FILE_DAC_WRITE,
            PRIV_FILE_OWNER,
            NULL);
    }

    return (cr);
}

/*
 * Initialize the ksid based on the given smb_id_t.
 */
static void
smb_cred_set_sid(smb_id_t *id, ksid_t *ksid)
{
    char sidstr[SMB_SID_STRSZ];
    int rc;

    ASSERT(id);
    ASSERT(id->i_sid);

    ksid->ks_id = id->i_id;
    smb_sid_tostr(id->i_sid, sidstr);
    rc = smb_sid_splitstr(sidstr, &ksid->ks_rid);
    ASSERT(rc == 0);

    ksid->ks_attr = id->i_attrs;
    ksid->ks_domain = ksid_lookupdomain(sidstr);
}

/*
 * Allocate and initialize the ksidlist based on the access token group list.
 */
static ksidlist_t *
smb_cred_set_sidlist(smb_ids_t *token_grps)
{
    int i;
    ksidlist_t *lp;

    lp = kmem_zalloc(KSIDLIST_MEM(token_grps->i_cnt), KM_SLEEP);
    lp->ksl_ref = 1;
    lp->ksl_nsid = token_grps->i_cnt;
    lp->ksl_neid = 0;

    for (i = 0; i < lp->ksl_nsid; i++) {
        smb_cred_set_sid(&token_grps->i_ids[i], &lp->ksl_sids[i]);
        if (lp->ksl_sids[i].ks_id > IDMAP_WK__MAX_GID)
            lp->ksl_neid++;
    }

    return (lp);
}