libtsnet/common/tsol_sgettpent.c

	tsol_sgettpent.c revision 4b484e007f44a62fb92d63bf345660cb76111d26
/*
 * 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 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 *
 * From "tsol_tndb_parser.c 7.24    01/09/05 SMI; TSOL 2.x"
 *
 * These functions parse entries in the "tnrhtp" (remote host template) file.
 * Each entry in this file has two fields, separated by a colon.  The first
 * field is the template name.  The second is a list of "key=value" attributes,
 * separated by semicolons.
 *
 * In order to help preserve sanity, we do not allow more than one unescaped
 * colon in a line, nor any unescaped '=' or ';' characters in the template
 * name.  Such things are indicative of typing errors, not intentional
 * configuration.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <strings.h>
#include <libtsnet.h>
#include <tsol/label.h>
#include <sys/tsol/label_macro.h>
#include <sys/types.h>
#include <nss.h>
#include <secdb.h>
#include <errno.h>

static int
get_tn_doi(tsol_tpent_t *tpentp, kva_t *kv)
{
    char    *cp;
    char    *val = NULL;

    val = kva_match(kv, TP_DOI);
    if (val == NULL)
        return (LTSNET_NO_DOI);

    errno = 0;
    tpentp->tp_doi = strtol(val, &cp, 0);
    if (errno != 0)
        return (LTSNET_SYSERR);
    if (*cp != '\0')
        return (LTSNET_ILL_DOI);

    return (0);
}

static int
get_tn_sl_range(brange_t *range, char *min, char *max)
{
    int err = 0;

    if (min == NULL && max == NULL)
        return (LTSNET_NO_RANGE);
    if (min == NULL)
        return (LTSNET_NO_LOWERBOUND);
    if (max == NULL)
        return (LTSNET_NO_UPPERBOUND);

    if (stobsl(min, &range->lower_bound, NO_CORRECTION, &err) == 0)
        return (LTSNET_ILL_LOWERBOUND);
    if (stobsl(max, &range->upper_bound, NO_CORRECTION, &err) == 0)
        return (LTSNET_ILL_UPPERBOUND);
    if (!bldominates(&range->upper_bound, &range->lower_bound))
        return (LTSNET_ILL_RANGE);

    return (0);
}

static int
get_tn_sl_set(blset_t *labelset, char *setstr)
{
    int     sc, err;
    char        *tokp, *finally;
    bslabel_t   *labels;

    (void) memset(labelset, 0, sizeof (blset_t));
    labels = (bslabel_t *)labelset;
    tokp = strtok_r(setstr, TNDB_COMMA, &finally);
    for (sc = 0; tokp != NULL && sc < NSLS_MAX; sc++) {
        if (stobsl(tokp, &labels[sc], NO_CORRECTION, &err) == 0)
            return (LTSNET_ILL_LABEL);
        tokp = strtok_r(NULL, TNDB_COMMA, &finally);
    }
    if (tokp != NULL && sc >= NSLS_MAX)
        return (LTSNET_SET_TOO_BIG);

    return (0);
}

static int
parse_remainder(tsol_tpent_t *tpentp, kva_t *kv)
{
    int err = 0;
    char    *val = NULL;
    char    *val2 = NULL;

    val = kva_match(kv, TP_HOSTTYPE);

    if (val == NULL)
        return (LTSNET_NO_HOSTTYPE);
    if (strcasecmp(val, TP_UNLABELED) == 0)
        tpentp->host_type = UNLABELED;
    else if (strcasecmp(val, TP_CIPSO) == 0)
        tpentp->host_type = SUN_CIPSO;
    else
        return (LTSNET_ILL_HOSTTYPE);

    /*
     * parse fields by host type -
     * add on to the following if statement for each new host type.
     */
    if (tpentp->host_type == UNLABELED) {
        tpentp->tp_mask_unl = 0;
        /*
         * doi
         */
        if ((err = get_tn_doi(tpentp, kv)) != 0)
            return (err);
        tpentp->tp_mask_unl |= TSOL_MSK_CIPSO_DOI;
        /*
         * default label
         */
        val = kva_match(kv, TP_DEFLABEL);
        if (val == NULL)
            return (LTSNET_NO_LABEL);
        if (stobsl(val, &tpentp->tp_def_label, NO_CORRECTION,
            &err) == 0)
            return (LTSNET_ILL_LABEL);
        tpentp->tp_mask_unl |= TSOL_MSK_DEF_LABEL;
        /*
         * check label range
         */
        val = kva_match(kv, TP_MINLABEL);
        val2 = kva_match(kv, TP_MAXLABEL);
        if (val == NULL && val2 == NULL) {
            /*
             * This is the old format.  Use ADMIN_LOW to SL of the
             * default label as the gw_sl_range.
             */
            bsllow(&tpentp->tp_gw_sl_range.lower_bound);
            tpentp->tp_gw_sl_range.upper_bound =
                tpentp->tp_def_label;
        } else {
            err = get_tn_sl_range(&tpentp->tp_gw_sl_range, val,
                val2);
            if (err != 0)
                return (err);
        }
        tpentp->tp_mask_unl |= TSOL_MSK_SL_RANGE_TSOL;

        /*
         * also label set, if present.  (optional)
         */
        val = kva_match(kv, TP_SET);
        if (val != NULL) {
            err = get_tn_sl_set(&tpentp->tp_gw_sl_set, val);
            if (err != 0)
                return (err);
            tpentp->tp_mask_cipso |= TSOL_MSK_SL_RANGE_TSOL;
        }
    } else {
        tpentp->tp_mask_cipso = 0;
        /*
         * doi
         */
        if ((err = get_tn_doi(tpentp, kv)) != 0)
            return (err);
        tpentp->tp_mask_cipso |= TSOL_MSK_CIPSO_DOI;
        /*
         * label range
         */
        val = kva_match(kv, TP_MINLABEL);
        val2 = kva_match(kv, TP_MAXLABEL);
        err = get_tn_sl_range(&tpentp->tp_sl_range_cipso, val, val2);
        if (err != 0)
            return (err);
        tpentp->tp_mask_cipso |= TSOL_MSK_SL_RANGE_TSOL;
        /*
         * also label set, if present.  (optional)
         */
        val = kva_match(kv, TP_SET);
        if (val != NULL) {
            err = get_tn_sl_set(&tpentp->tp_sl_set_cipso, val);
            if (err != 0)
                return (err);
            tpentp->tp_mask_cipso |= TSOL_MSK_SL_RANGE_TSOL;
        }

        /* CIPSO entries don't support default labels */
        val = kva_match(kv, TP_DEFLABEL);
        if (val != NULL)
            return (LTSNET_BAD_TYPE);
    }

    return (0);
}

tsol_tpent_t *
tpstr_to_ent(tsol_tpstr_t *tpstrp, int *errp, char **errstrp)
{
    int     err = 0;
    char        *errstr;
    char        *template = tpstrp->template;
    char        *attrs = tpstrp->attrs;
    kva_t       *kv;
    tsol_tpent_t    *tpentp = NULL;

    /*
     * The user can specify NULL pointers for these.  Make sure that we
     * don't have to deal with checking for NULL everywhere by just
     * pointing to our own variables if the user gives NULL.
     */
    if (errp == NULL)
        errp = &err;
    if (errstrp == NULL)
        errstrp = &errstr;
    /* The default, unless we find a more specific error locus. */
    *errstrp = template;

    if (template == NULL || *template == '#' || *template == '\n') {
        *errp = LTSNET_EMPTY;
        if (attrs && *attrs != '\0' && *attrs != '#' && *attrs != '\n')
            *errstrp = attrs;
        else if (template == NULL)
            *errstrp = "   ";
        goto err_ret;
    }
    if (*template == '\0') {
        *errp = LTSNET_NO_NAME;
        if (attrs && *attrs != '\0' && *attrs != '#' && *attrs != '\n')
            *errstrp = attrs;
        goto err_ret;
    }
    if (attrs == NULL || *attrs == '\0' || *attrs == '#' ||
        *attrs == '\n') {
        *errp = LTSNET_NO_ATTRS;
        goto err_ret;
    }
    if ((tpentp = calloc(1, sizeof (*tpentp))) == NULL) {
        *errp = LTSNET_SYSERR;
        return (NULL);
    }
    if (strlcpy(tpentp->name, template, sizeof (tpentp->name)) >=
        sizeof (tpentp->name)) {
        *errp = LTSNET_ILL_NAME;
        goto err_ret;
    }
    kv = _str2kva(attrs, KV_ASSIGN, KV_DELIMITER);
    *errp = parse_remainder(tpentp, kv);
    _kva_free(kv);
    if (*errp == 0) {
#ifdef  DEBUG
        (void) fprintf(stdout, "tpstr_to_ent: %s:%s\n", tpentp->name,
            attrs);
#endif  /* DEBUG */

        return (tpentp);
    }

err_ret:
    err = errno;
    tsol_freetpent(tpentp);
    errno = err;
#ifdef  DEBUG
    (void) fprintf(stderr, "\ntpstr_to_ent: %s:%s\n",
        *errstrp, (char *)tsol_strerror(*errp, errno));
#endif  /* DEBUG */

    return (NULL);
}

void
tsol_freetpent(tsol_tpent_t *tp)
{
    if (tp != NULL)
        free(tp);
}