bin/named/zoneconf.c

	zoneconf.c revision 80dd46d7aab16c42a8c1acf6156c95406a9f20a4
/*
 * Copyright (C) 1999-2001  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
 * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
 * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/* $Id: zoneconf.c,v 1.96 2001/11/08 05:36:23 marka Exp $ */

#include <config.h>

#include <isc/buffer.h>
#include <isc/mem.h>
#include <isc/print.h>
#include <isc/string.h>     /* Required for HP/UX (and others?) */
#include <isc/util.h>

#include <dns/acl.h>
#include <dns/fixedname.h>
#include <dns/log.h>
#include <dns/name.h>
#include <dns/rdatatype.h>
#include <dns/ssu.h>
#include <dns/zone.h>

#include <named/config.h>
#include <named/globals.h>
#include <named/log.h>
#include <named/zoneconf.h>

/*
 * These are BIND9 server defaults, not necessarily identical to the
 * library defaults defined in zone.c.
 */
#define RETERR(x) do { \
    isc_result_t _r = (x); \
    if (_r != ISC_R_SUCCESS) \
        return (_r); \
    } while (0)

/*
 * Convenience function for configuring a single zone ACL.
 */
static isc_result_t
configure_zone_acl(cfg_obj_t *zconfig, cfg_obj_t *vconfig, cfg_obj_t *config,
           const char *aclname, ns_aclconfctx_t *actx,
           dns_zone_t *zone,
           void (*setzacl)(dns_zone_t *, dns_acl_t *),
           void (*clearzacl)(dns_zone_t *))
{
    isc_result_t result;
    cfg_obj_t *maps[4];
    cfg_obj_t *aclobj = NULL;
    int i = 0;
    dns_acl_t *dacl = NULL;

    if (zconfig != NULL)
        maps[i++] = cfg_tuple_get(zconfig, "options");
    if (vconfig != NULL)
        maps[i++] = cfg_tuple_get(vconfig, "options");
    if (config != NULL) {
        cfg_obj_t *options = NULL;
        (void)cfg_map_get(config, "options", &options);
        if (options != NULL)
            maps[i++] = options;
    }
    maps[i] = NULL;

    result = ns_config_get(maps, aclname, &aclobj);
    if (aclobj == NULL) {
        (*clearzacl)(zone);
        return (ISC_R_SUCCESS);
    }

    result = ns_acl_fromconfig(aclobj, config, actx,
                   dns_zone_getmctx(zone), &dacl);
    if (result != ISC_R_SUCCESS)
        return (result);
    (*setzacl)(zone, dacl);
    dns_acl_detach(&dacl);
    return (ISC_R_SUCCESS);
}

/*
 * Parse the zone update-policy statement.
 */
static isc_result_t
configure_zone_ssutable(cfg_obj_t *zconfig, dns_zone_t *zone) {
    cfg_obj_t *updatepolicy = NULL;
    cfg_listelt_t *element, *element2;
    dns_ssutable_t *table = NULL;
    isc_mem_t *mctx = dns_zone_getmctx(zone);
    isc_result_t result;

    (void)cfg_map_get(zconfig, "update-policy", &updatepolicy);
    if (updatepolicy == NULL)
        return (ISC_R_SUCCESS);

    result = dns_ssutable_create(mctx, &table);
    if (result != ISC_R_SUCCESS)
        return (result);

    for (element = cfg_list_first(updatepolicy);
         element != NULL;
         element = cfg_list_next(element))
    {
        cfg_obj_t *stmt = cfg_listelt_value(element);
        cfg_obj_t *mode = cfg_tuple_get(stmt, "mode");
        cfg_obj_t *identity = cfg_tuple_get(stmt, "identity");
        cfg_obj_t *matchtype = cfg_tuple_get(stmt, "matchtype");
        cfg_obj_t *dname = cfg_tuple_get(stmt, "name");
        cfg_obj_t *typelist = cfg_tuple_get(stmt, "types");
        char *str;
        isc_boolean_t grant = ISC_FALSE;
        unsigned int mtype = DNS_SSUMATCHTYPE_NAME;
        dns_fixedname_t fname, fident;
        isc_buffer_t b;
        dns_rdatatype_t *types;
        unsigned int i, n;

        str = cfg_obj_asstring(mode);
        if (strcasecmp(str, "grant") == 0)
            grant = ISC_TRUE;
        else if (strcasecmp(str, "deny") == 0)
            grant = ISC_FALSE;
        else
            INSIST(0);

        str = cfg_obj_asstring(matchtype);
        if (strcasecmp(str, "name") == 0)
            mtype = DNS_SSUMATCHTYPE_NAME;
        else if (strcasecmp(str, "subdomain") == 0)
            mtype = DNS_SSUMATCHTYPE_SUBDOMAIN;
        else if (strcasecmp(str, "wildcard") == 0)
            mtype = DNS_SSUMATCHTYPE_WILDCARD;
        else if (strcasecmp(str, "self") == 0)
            mtype = DNS_SSUMATCHTYPE_SELF;
        else
            INSIST(0);

        dns_fixedname_init(&fident);
        str = cfg_obj_asstring(identity);
        isc_buffer_init(&b, str, strlen(str));
        isc_buffer_add(&b, strlen(str));
        result = dns_name_fromtext(dns_fixedname_name(&fident), &b,
                       dns_rootname, ISC_FALSE, NULL);
        if (result != ISC_R_SUCCESS) {
            cfg_obj_log(identity, ns_g_lctx, ISC_LOG_ERROR,
                    "'%s' is not a valid name", str);
            goto cleanup;
        }

        dns_fixedname_init(&fname);
        str = cfg_obj_asstring(dname);
        isc_buffer_init(&b, str, strlen(str));
        isc_buffer_add(&b, strlen(str));
        result = dns_name_fromtext(dns_fixedname_name(&fname), &b,
                       dns_rootname, ISC_FALSE, NULL);
        if (result != ISC_R_SUCCESS) {
            cfg_obj_log(identity, ns_g_lctx, ISC_LOG_ERROR,
                    "'%s' is not a valid name", str);
            goto cleanup;
        }

        n = ns_config_listcount(typelist);
        if (n == 0)
            types = NULL;
        else {
            types = isc_mem_get(mctx, n * sizeof(dns_rdatatype_t));
            if (types == NULL) {
                result = ISC_R_NOMEMORY;
                goto cleanup;
            }
        }

        i = 0;
        for (element2 = cfg_list_first(typelist);
             element2 != NULL;
             element2 = cfg_list_next(element2))
        {
            cfg_obj_t *typeobj;
            isc_textregion_t r;

            INSIST(i < n);

            typeobj = cfg_listelt_value(element2);
            str = cfg_obj_asstring(typeobj);
            r.base = str;
            r.length = strlen(str);

            result = dns_rdatatype_fromtext(&types[i++], &r);
            if (result != ISC_R_SUCCESS) {
                cfg_obj_log(identity, ns_g_lctx, ISC_LOG_ERROR,
                        "'%s' is not a valid type", str);
                isc_mem_put(mctx, types,
                        n * sizeof(dns_rdatatype_t));
                goto cleanup;
            }
        }
        INSIST(i == n);

        result = dns_ssutable_addrule(table, grant,
                          dns_fixedname_name(&fident),
                          mtype,
                          dns_fixedname_name(&fname),
                          n, types);
        if (types != NULL)
            isc_mem_put(mctx, types, n * sizeof(dns_rdatatype_t));
        if (result != ISC_R_SUCCESS) {
            goto cleanup;
        }

    }

    result = ISC_R_SUCCESS;
    dns_zone_setssutable(zone, table);

 cleanup:
    dns_ssutable_detach(&table);
    return (result);
}

/*
 * Convert a config file zone type into a server zone type.
 */
static inline dns_zonetype_t
zonetype_fromconfig(cfg_obj_t *map) {
    cfg_obj_t *obj = NULL;
    isc_result_t result;

    result = cfg_map_get(map, "type", &obj);
    INSIST(result == ISC_R_SUCCESS);
    return (ns_config_getzonetype(obj));
}

/*
 * Helper function for strtoargv().  Pardon the gratuitous recursion.
 */
static isc_result_t
strtoargvsub(isc_mem_t *mctx, char *s, unsigned int *argcp,
         char ***argvp, unsigned int n)
{
    isc_result_t result;

    /* Discard leading whitespace. */
    while (*s == ' ' || *s == '\t')
        s++;

    if (*s == '\0') {
        /* We have reached the end of the string. */
        *argcp = n;
        *argvp = isc_mem_get(mctx, n * sizeof(char *));
        if (*argvp == NULL)
            return (ISC_R_NOMEMORY);
    } else {
        char *p = s;
        while (*p != ' ' && *p != '\t' && *p != '\0')
            p++;
        if (*p != '\0')
            *p++ = '\0';

        result = strtoargvsub(mctx, p, argcp, argvp, n + 1);
        if (result != ISC_R_SUCCESS)
            return (result);
        (*argvp)[n] = s;
    }
    return (ISC_R_SUCCESS);
}

/*
 * Tokenize the string "s" into whitespace-separated words,
 * return the number of words in '*argcp' and an array
 * of pointers to the words in '*argvp'.  The caller
 * must free the array using isc_mem_put().  The string
 * is modified in-place.
 */
static isc_result_t
strtoargv(isc_mem_t *mctx, char *s, unsigned int *argcp, char ***argvp) {
    return (strtoargvsub(mctx, s, argcp, argvp, 0));
}

isc_result_t
ns_zone_configure(cfg_obj_t *config, cfg_obj_t *vconfig, cfg_obj_t *zconfig,
          ns_aclconfctx_t *ac, dns_zone_t *zone)
{
    isc_result_t result;
    char *zname;
    dns_rdataclass_t zclass;
    dns_rdataclass_t vclass;
    cfg_obj_t *maps[5];
    cfg_obj_t *zoptions = NULL;
    cfg_obj_t *options = NULL;
    cfg_obj_t *obj;
    const char *filename = NULL;
    dns_notifytype_t notifytype = dns_notifytype_yes;
    isc_sockaddr_t *addrs;
    dns_name_t **keynames;
    isc_uint32_t count;
    char *cpval;
    unsigned int dbargc;
    char **dbargv;
    static char default_dbtype[] = "rbt";
    isc_mem_t *mctx = dns_zone_getmctx(zone);
    dns_dialuptype_t dialup = dns_dialuptype_no;
    dns_zonetype_t ztype;
    int i;
    isc_int32_t journal_size;

    i = 0;
    if (zconfig != NULL) {
        zoptions = cfg_tuple_get(zconfig, "options");
        maps[i++] = zoptions;
    }
    if (vconfig != NULL)
        maps[i++] = cfg_tuple_get(vconfig, "options");
    if (config != NULL) {
        (void)cfg_map_get(config, "options", &options);
        if (options != NULL)
            maps[i++] = options;
    }
    maps[i++] = ns_g_defaults;
    maps[i++] = NULL;

    if (vconfig != NULL)
        RETERR(ns_config_getclass(cfg_tuple_get(vconfig, "class"),
                      dns_rdataclass_in, &vclass));
    else
        vclass = dns_rdataclass_in;

    /*
     * Configure values common to all zone types.
     */

    zname = cfg_obj_asstring(cfg_tuple_get(zconfig, "name"));

    RETERR(ns_config_getclass(cfg_tuple_get(zconfig, "class"),
                  vclass, &zclass));
    dns_zone_setclass(zone, zclass);

    ztype = zonetype_fromconfig(zoptions);
    dns_zone_settype(zone, ztype);

    obj = NULL;
    result = cfg_map_get(zoptions, "database", &obj);
    if (result == ISC_R_SUCCESS)
        cpval = cfg_obj_asstring(obj);
    else
        cpval = default_dbtype;
    RETERR(strtoargv(mctx, cpval, &dbargc, &dbargv));
    /*
     * ANSI C is strange here.  There is no logical reason why (char **)
     * cannot be promoted automatically to (const char * const *) by the
     * compiler w/o generating a warning.
     */
    RETERR(dns_zone_setdbtype(zone, dbargc, (const char * const *)dbargv));
    isc_mem_put(mctx, dbargv, dbargc * sizeof(*dbargv));

    obj = NULL;
    result = cfg_map_get(zoptions, "file", &obj);
    if (result == ISC_R_SUCCESS)
        filename = cfg_obj_asstring(obj);
    RETERR(dns_zone_setfile(zone, filename));

    if (ztype == dns_zone_slave)
        RETERR(configure_zone_acl(zconfig, vconfig, config,
                      "allow-notify", ac, zone,
                      dns_zone_setnotifyacl,
                      dns_zone_clearnotifyacl));
    /*
     * XXXAG This probably does not make sense for stubs.
     */
    RETERR(configure_zone_acl(zconfig, vconfig, config,
                  "allow-query", ac, zone,
                  dns_zone_setqueryacl,
                  dns_zone_clearqueryacl));

    obj = NULL;
    result = ns_config_get(maps, "dialup", &obj);
    INSIST(result == ISC_R_SUCCESS);
    if (cfg_obj_isboolean(obj)) {
        if (cfg_obj_asboolean(obj))
            dialup = dns_dialuptype_yes;
        else
            dialup = dns_dialuptype_no;
    } else {
        char *dialupstr = cfg_obj_asstring(obj);
        if (strcasecmp(dialupstr, "notify") == 0)
            dialup = dns_dialuptype_notify;
        else if (strcasecmp(dialupstr, "notify-passive") == 0)
            dialup = dns_dialuptype_notifypassive;
        else if (strcasecmp(dialupstr, "refresh") == 0)
            dialup = dns_dialuptype_refresh;
        else if (strcasecmp(dialupstr, "passive") == 0)
            dialup = dns_dialuptype_passive;
        else
            INSIST(0);
    }
    dns_zone_setdialup(zone, dialup);

    obj = NULL;
    result = ns_config_get(maps, "zone-statistics", &obj);
    INSIST(result == ISC_R_SUCCESS);
    dns_zone_setstatistics(zone, cfg_obj_asboolean(obj));

    /*
     * Configure master functionality.  This applies
     * to primary masters (type "master") and slaves
     * acting as masters (type "slave"), but not to stubs.
     */
    if (ztype != dns_zone_stub) {
        obj = NULL;
        result = ns_config_get(maps, "notify", &obj);
        INSIST(result == ISC_R_SUCCESS);
        if (cfg_obj_isboolean(obj)) {
            if (cfg_obj_asboolean(obj))
                notifytype = dns_notifytype_yes;
            else
                notifytype = dns_notifytype_no;
        } else {
            char *notifystr = cfg_obj_asstring(obj);
            if (strcasecmp(notifystr, "explicit") == 0)
                notifytype = dns_notifytype_explicit;
            else
                INSIST(0);
        }
        dns_zone_setnotifytype(zone, notifytype);

        obj = NULL;
        result = ns_config_get(maps, "also-notify", &obj);
        if (result == ISC_R_SUCCESS) {
            isc_sockaddr_t *addrs = NULL;
            isc_uint32_t addrcount;
            result = ns_config_getiplist(config, obj, 0, mctx,
                             &addrs, &addrcount);
            if (result != ISC_R_SUCCESS)
                return (result);
            result = dns_zone_setalsonotify(zone, addrs,
                            addrcount);
            ns_config_putiplist(mctx, &addrs, addrcount);
            if (result != ISC_R_SUCCESS)
                return (result);
        } else
            RETERR(dns_zone_setalsonotify(zone, NULL, 0));

        obj = NULL;
        result = ns_config_get(maps, "notify-source", &obj);
        INSIST(result == ISC_R_SUCCESS);
        dns_zone_setnotifysrc4(zone, cfg_obj_assockaddr(obj));

        obj = NULL;
        result = ns_config_get(maps, "notify-source-v6", &obj);
        INSIST(result == ISC_R_SUCCESS);
        dns_zone_setnotifysrc6(zone, cfg_obj_assockaddr(obj));

        RETERR(configure_zone_acl(zconfig, vconfig, config,
                      "allow-transfer", ac, zone,
                      dns_zone_setxfracl,
                      dns_zone_clearxfracl));

        obj = NULL;
        result = ns_config_get(maps, "max-transfer-time-out", &obj);
        INSIST(result == ISC_R_SUCCESS);
        dns_zone_setmaxxfrout(zone, cfg_obj_asuint32(obj) * 60);

        obj = NULL;
        result = ns_config_get(maps, "max-transfer-idle-out", &obj);
        INSIST(result == ISC_R_SUCCESS);
        dns_zone_setidleout(zone, cfg_obj_asuint32(obj) * 60);

        obj = NULL;
        result =  ns_config_get(maps, "max-journal-size", &obj);
        INSIST(result == ISC_R_SUCCESS);
        dns_zone_setjournalsize(zone, -1);
        if (cfg_obj_isstring(obj)) {
            const char *str = cfg_obj_asstring(obj);
            INSIST(strcasecmp(str, "unlimited") == 0);
            journal_size = ISC_UINT32_MAX / 2;
        } else {
            isc_resourcevalue_t value;
            value = cfg_obj_asuint64(obj);
            if (value > ISC_UINT32_MAX / 2) {
                cfg_obj_log(obj, ns_g_lctx,
                        ISC_LOG_ERROR,
                        "'max-journal-size "
                        "%" ISC_PRINT_QUADFORMAT "d' "
                        "is too large",
                        value);
                RETERR(ISC_R_RANGE);
            }
            journal_size = (isc_uint32_t)value;
        }
        dns_zone_setjournalsize(zone, journal_size);

        obj = NULL;
        result = ns_config_get(maps, "ixfr-from-differences", &obj);
        INSIST(result == ISC_R_SUCCESS);
        dns_zone_setoption(zone, DNS_ZONEOPT_IXFRFROMDIFFS,
                   cfg_obj_asboolean(obj));
    }

    /*
     * Configure update-related options.  These apply to
     * primary masters only.
     */
    if (ztype == dns_zone_master) {
        dns_acl_t *updateacl;
        RETERR(configure_zone_acl(zconfig, vconfig, config,
                      "allow-update", ac, zone,
                      dns_zone_setupdateacl,
                      dns_zone_clearupdateacl));

        updateacl = dns_zone_getupdateacl(zone);
        if (updateacl != NULL  && dns_acl_isinsecure(updateacl))
            isc_log_write(ns_g_lctx, DNS_LOGCATEGORY_SECURITY,
                      NS_LOGMODULE_SERVER, ISC_LOG_WARNING,
                      "zone '%s' allows updates by IP "
                      "address, which is insecure",
                      zname);

        RETERR(configure_zone_ssutable(zoptions, zone));

        obj = NULL;
        result = ns_config_get(maps, "sig-validity-interval", &obj);
        INSIST(result == ISC_R_SUCCESS);
        dns_zone_setsigvalidityinterval(zone,
                        cfg_obj_asuint32(obj) * 86400);
    } else if (ztype == dns_zone_slave) {
        RETERR(configure_zone_acl(zconfig, vconfig, config,
                      "allow-update-forwarding", ac, zone,
                      dns_zone_setforwardacl,
                      dns_zone_clearforwardacl));
    }

    /*
     * Configure slave functionality.
     */
    switch (ztype) {
    case dns_zone_slave:
    case dns_zone_stub:
        obj = NULL;
        result = cfg_map_get(zoptions, "masters", &obj);
        if (obj != NULL) {
            addrs = NULL;
            keynames = NULL;
            RETERR(ns_config_getipandkeylist(config, obj, mctx,
                             &addrs, &keynames,
                             &count));
            result = dns_zone_setmasterswithkeys(zone, addrs,
                                 keynames, count);
            ns_config_putipandkeylist(mctx, &addrs, &keynames,
                          count);
        } else
            result = dns_zone_setmasters(zone, NULL, 0);
        RETERR(result);

        obj = NULL;
        result = ns_config_get(maps, "max-transfer-time-in", &obj);
        INSIST(result == ISC_R_SUCCESS);
        dns_zone_setmaxxfrin(zone, cfg_obj_asuint32(obj) * 60);

        obj = NULL;
        result = ns_config_get(maps, "max-transfer-idle-in", &obj);
        INSIST(result == ISC_R_SUCCESS);
        dns_zone_setidlein(zone, cfg_obj_asuint32(obj) * 60);

        obj = NULL;
        result = ns_config_get(maps, "max-refresh-time", &obj);
        INSIST(result == ISC_R_SUCCESS);
        dns_zone_setmaxrefreshtime(zone, cfg_obj_asuint32(obj));

        obj = NULL;
        result = ns_config_get(maps, "min-refresh-time", &obj);
        INSIST(result == ISC_R_SUCCESS);
        dns_zone_setminrefreshtime(zone, cfg_obj_asuint32(obj));

        obj = NULL;
        result = ns_config_get(maps, "max-retry-time", &obj);
        INSIST(result == ISC_R_SUCCESS);
        dns_zone_setmaxretrytime(zone, cfg_obj_asuint32(obj));

        obj = NULL;
        result = ns_config_get(maps, "min-retry-time", &obj);
        INSIST(result == ISC_R_SUCCESS);
        dns_zone_setminretrytime(zone, cfg_obj_asuint32(obj));

        obj = NULL;
        result = ns_config_get(maps, "transfer-source", &obj);
        INSIST(result == ISC_R_SUCCESS);
        dns_zone_setxfrsource4(zone, cfg_obj_assockaddr(obj));

        obj = NULL;
        result = ns_config_get(maps, "transfer-source-v6", &obj);
        INSIST(result == ISC_R_SUCCESS);
        dns_zone_setxfrsource6(zone, cfg_obj_assockaddr(obj));

        break;

    default:
        break;
    }

    return (ISC_R_SUCCESS);
}

isc_boolean_t
ns_zone_reusable(dns_zone_t *zone, cfg_obj_t *zconfig) {
    cfg_obj_t *zoptions = NULL;
    cfg_obj_t *obj = NULL;
    const char *cfilename;
    const char *zfilename;

    zoptions = cfg_tuple_get(zconfig, "options");

    if (zonetype_fromconfig(zoptions) != dns_zone_gettype(zone))
        return (ISC_FALSE);

    obj = NULL;
    (void)cfg_map_get(zoptions, "file", &obj);
    if (obj != NULL)
        cfilename = cfg_obj_asstring(obj);
    else
        cfilename = NULL;
    zfilename = dns_zone_getfile(zone);
    if (!((cfilename == NULL && zfilename == NULL) ||
          (cfilename != NULL && zfilename != NULL &&
           strcmp(cfilename, zfilename) == 0)))
        return (ISC_FALSE);

    return (ISC_TRUE);
}