bin/dnssec/dnssec-dsfromkey.c

	dnssec-dsfromkey.c revision 9edd523c2295757f1e1c5e93ea369cae892f0754
/*
 * Copyright (C) 2008, 2009  Internet Systems Consortium, Inc. ("ISC")
 *
 * Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC 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: dnssec-dsfromkey.c,v 1.10 2009/07/19 05:06:48 each Exp $ */

/*! \file */

#include <config.h>

#include <stdlib.h>

#include <isc/buffer.h>
#include <isc/commandline.h>
#include <isc/entropy.h>
#include <isc/hash.h>
#include <isc/mem.h>
#include <isc/print.h>
#include <isc/string.h>
#include <isc/util.h>

#include <dns/db.h>
#include <dns/dbiterator.h>
#include <dns/ds.h>
#include <dns/fixedname.h>
#include <dns/log.h>
#include <dns/keyvalues.h>
#include <dns/master.h>
#include <dns/name.h>
#include <dns/rdata.h>
#include <dns/rdataclass.h>
#include <dns/rdataset.h>
#include <dns/rdatasetiter.h>
#include <dns/rdatatype.h>
#include <dns/result.h>

#include <dst/dst.h>

#include "dnssectool.h"

#ifndef PATH_MAX
#define PATH_MAX 1024   /* AIX, WIN32, and others don't define this. */
#endif

const char *program = "dnssec-dsfromkey";
int verbose;

static dns_rdataclass_t rdclass;
static dns_fixedname_t  fixed;
static dns_name_t   *name = NULL;
static isc_mem_t    *mctx = NULL;

static isc_result_t
initname(char *setname) {
    isc_result_t result;
    isc_buffer_t buf;

    dns_fixedname_init(&fixed);
    name = dns_fixedname_name(&fixed);

    isc_buffer_init(&buf, setname, strlen(setname));
    isc_buffer_add(&buf, strlen(setname));
    result = dns_name_fromtext(name, &buf, dns_rootname, ISC_FALSE, NULL);
    return (result);
}

static isc_result_t
loadsetfromfile(char *filename, dns_rdataset_t *rdataset) {
    isc_result_t     result;
    dns_db_t     *db = NULL;
    dns_dbnode_t     *node = NULL;
    char setname[DNS_NAME_FORMATSIZE];

    dns_name_format(name, setname, sizeof(setname));

    result = dns_db_create(mctx, "rbt", name, dns_dbtype_zone,
                   rdclass, 0, NULL, &db);
    if (result != ISC_R_SUCCESS)
        fatal("can't create database");

    result = dns_db_load(db, filename);
    if (result != ISC_R_SUCCESS && result != DNS_R_SEENINCLUDE)
        fatal("can't load %s: %s", filename, isc_result_totext(result));

    result = dns_db_findnode(db, name, ISC_FALSE, &node);
    if (result != ISC_R_SUCCESS)
        fatal("can't find %s node in %s", setname, filename);

    result = dns_db_findrdataset(db, node, NULL, dns_rdatatype_dnskey,
                     0, 0, rdataset, NULL);

    if (result == ISC_R_NOTFOUND)
        fatal("no DNSKEY RR for %s in %s", setname, filename);
    else if (result != ISC_R_SUCCESS)
        fatal("dns_db_findrdataset");

    if (node != NULL)
        dns_db_detachnode(db, &node);
    if (db != NULL)
        dns_db_detach(&db);
    return (result);
}

static isc_result_t
loadkeyset(char *dirname, dns_rdataset_t *rdataset) {
    isc_result_t     result;
    char         filename[PATH_MAX + 1];
    isc_buffer_t     buf;

    dns_rdataset_init(rdataset);

    isc_buffer_init(&buf, filename, sizeof(filename));
    if (dirname != NULL) {
        /* allow room for a trailing slash */
        if (strlen(dirname) >= isc_buffer_availablelength(&buf))
            return (ISC_R_NOSPACE);
        isc_buffer_putstr(&buf, dirname);
        if (dirname[strlen(dirname) - 1] != '/')
            isc_buffer_putstr(&buf, "/");
    }

    if (isc_buffer_availablelength(&buf) < 7)
        return (ISC_R_NOSPACE);
    isc_buffer_putstr(&buf, "keyset-");

    result = dns_name_tofilenametext(name, ISC_FALSE, &buf);
    check_result(result, "dns_name_tofilenametext()");
    if (isc_buffer_availablelength(&buf) == 0)
        return (ISC_R_NOSPACE);
    isc_buffer_putuint8(&buf, 0);

    return (loadsetfromfile(filename, rdataset));
}

static void
loadkey(char *filename, unsigned char *key_buf, unsigned int key_buf_size,
    dns_rdata_t *rdata)
{
    isc_result_t  result;
    dst_key_t     *key = NULL;
    isc_buffer_t  keyb;
    isc_region_t  r;

    dns_rdata_init(rdata);

    isc_buffer_init(&keyb, key_buf, key_buf_size);

    result = dst_key_fromnamedfile(filename, NULL, DST_TYPE_PUBLIC,
                       mctx, &key);
    if (result != ISC_R_SUCCESS)
        fatal("invalid keyfile name %s: %s",
              filename, isc_result_totext(result));

    if (verbose > 2) {
        char keystr[KEY_FORMATSIZE];

        key_format(key, keystr, sizeof(keystr));
        fprintf(stderr, "%s: %s\n", program, keystr);
    }

    result = dst_key_todns(key, &keyb);
    if (result != ISC_R_SUCCESS)
        fatal("can't decode key");

    isc_buffer_usedregion(&keyb, &r);
    dns_rdata_fromregion(rdata, dst_key_class(key),
                 dns_rdatatype_dnskey, &r);

    rdclass = dst_key_class(key);

    dns_fixedname_init(&fixed);
    name = dns_fixedname_name(&fixed);
    result = dns_name_copy(dst_key_name(key), name, NULL);
    if (result != ISC_R_SUCCESS)
        fatal("can't copy name");

    dst_key_free(&key);
}

static void
logkey(dns_rdata_t *rdata)
{
    isc_result_t result;
    dst_key_t    *key = NULL;
    isc_buffer_t buf;
    char         keystr[KEY_FORMATSIZE];

    isc_buffer_init(&buf, rdata->data, rdata->length);
    isc_buffer_add(&buf, rdata->length);
    result = dst_key_fromdns(name, rdclass, &buf, mctx, &key);
    if (result != ISC_R_SUCCESS)
        return;

    key_format(key, keystr, sizeof(keystr));
    fprintf(stderr, "%s: %s\n", program, keystr);

    dst_key_free(&key);
}

static void
emit(unsigned int dtype, isc_boolean_t showall, char *lookaside,
     dns_rdata_t *rdata)
{
    isc_result_t result;
    unsigned char buf[DNS_DS_BUFFERSIZE];
    char text_buf[DST_KEY_MAXTEXTSIZE];
    char name_buf[DNS_NAME_MAXWIRE];
    char class_buf[10];
    isc_buffer_t textb, nameb, classb;
    isc_region_t r;
    dns_rdata_t ds;
    dns_rdata_dnskey_t dnskey;

    isc_buffer_init(&textb, text_buf, sizeof(text_buf));
    isc_buffer_init(&nameb, name_buf, sizeof(name_buf));
    isc_buffer_init(&classb, class_buf, sizeof(class_buf));

    dns_rdata_init(&ds);

    result = dns_rdata_tostruct(rdata, &dnskey, NULL);
    if (result != ISC_R_SUCCESS)
        fatal("can't convert DNSKEY");

    if ((dnskey.flags & DNS_KEYFLAG_KSK) == 0 && !showall)
        return;

    result = dns_ds_buildrdata(name, rdata, dtype, buf, &ds);
    if (result != ISC_R_SUCCESS)
        fatal("can't build record");

    result = dns_name_totext(name, ISC_FALSE, &nameb);
    if (result != ISC_R_SUCCESS)
        fatal("can't print name");

    /* Add lookaside origin, if set */
    if (lookaside != NULL) {
        if (isc_buffer_availablelength(&nameb) < strlen(lookaside))
            fatal("DLV origin '%s' is too long", lookaside);
        isc_buffer_putstr(&nameb, lookaside);
        if (lookaside[strlen(lookaside) - 1] != '.') {
            if (isc_buffer_availablelength(&nameb) < 1)
                fatal("DLV origin '%s' is too long", lookaside);
            isc_buffer_putstr(&nameb, ".");
        }
    }

    result = dns_rdata_totext(&ds, (dns_name_t *) NULL, &textb);
    if (result != ISC_R_SUCCESS)
        fatal("can't print rdata");

    result = dns_rdataclass_totext(rdclass, &classb);
    if (result != ISC_R_SUCCESS)
        fatal("can't print class");

    isc_buffer_usedregion(&nameb, &r);
    fwrite(r.base, 1, r.length, stdout);

    putchar(' ');

    isc_buffer_usedregion(&classb, &r);
    fwrite(r.base, 1, r.length, stdout);

    if (lookaside == NULL)
        printf(" DS ");
    else
        printf(" DLV ");

    isc_buffer_usedregion(&textb, &r);
    fwrite(r.base, 1, r.length, stdout);
    putchar('\n');
}

static void
usage(void) {
    fprintf(stderr, "Usage:\n");
    fprintf(stderr, "    %s options [-K dir] keyfile\n\n", program);
    fprintf(stderr, "    %s options [-K dir] [-c class] -s dnsname\n\n",
        program);
    fprintf(stderr, "    %s options -f zonefile (as zone name)\n\n", program);
    fprintf(stderr, "    %s options -f zonefile zonename\n\n", program);
    fprintf(stderr, "Version: %s\n", VERSION);
    fprintf(stderr, "Options:\n");
    fprintf(stderr, "    -v <verbose level>\n");
    fprintf(stderr, "    -K <directory>: directory in which to find "
            "key file or keyset file\n");
    fprintf(stderr, "    -a algorithm: digest algorithm "
            "(SHA-1 or SHA-256)\n");
    fprintf(stderr, "    -1: use SHA-1\n");
    fprintf(stderr, "    -2: use SHA-256\n");
    fprintf(stderr, "    -l: add lookaside zone and print DLV records\n");
    fprintf(stderr, "    -s: read keyset from keyset-<dnsname> file\n");
    fprintf(stderr, "    -c class: rdata class for DS set (default: IN)\n");
    fprintf(stderr, "    -f file: read keyset from zone file\n");
    fprintf(stderr, "    -A: when used with -f, "
            "include all keys in DS set, not just KSKs\n");
    fprintf(stderr, "Output: DS or DLV RRs\n");

    exit (-1);
}

int
main(int argc, char **argv) {
    char        *algname = NULL, *classname = NULL;
    char        *filename = NULL, *dir = NULL, *namestr;
    char        *lookaside = NULL;
    char        *endp;
    int     ch;
    unsigned int    dtype = DNS_DSDIGEST_SHA1;
    isc_boolean_t   both = ISC_TRUE;
    isc_boolean_t   usekeyset = ISC_FALSE;
    isc_boolean_t   showall = ISC_FALSE;
    isc_result_t    result;
    isc_log_t   *log = NULL;
    isc_entropy_t   *ectx = NULL;
    dns_rdataset_t  rdataset;
    dns_rdata_t rdata;

    dns_rdata_init(&rdata);

    if (argc == 1)
        usage();

    result = isc_mem_create(0, 0, &mctx);
    if (result != ISC_R_SUCCESS)
        fatal("out of memory");

    dns_result_register();

    isc_commandline_errprint = ISC_FALSE;

    while ((ch = isc_commandline_parse(argc, argv,
                       "12Aa:c:d:Ff:K:l:sv:h")) != -1) {
        switch (ch) {
        case '1':
            dtype = DNS_DSDIGEST_SHA1;
            both = ISC_FALSE;
            break;
        case '2':
            dtype = DNS_DSDIGEST_SHA256;
            both = ISC_FALSE;
            break;
        case 'A':
            showall = ISC_TRUE;
            break;
        case 'a':
            algname = isc_commandline_argument;
            both = ISC_FALSE;
            break;
        case 'c':
            classname = isc_commandline_argument;
            break;
        case 'd':
            fprintf(stderr, "%s: the -d option is deprecated; "
                    "use -K\n", program);
            /* fall through */
        case 'K':
            dir = isc_commandline_argument;
            if (strlen(dir) == 0)
                fatal("directory must be non-empty string");
            break;
        case 'f':
            filename = isc_commandline_argument;
            break;
        case 'l':
            lookaside = isc_commandline_argument;
            if (strlen(lookaside) == 0)
                fatal("lookaside must be a non-empty string");
            break;
        case 's':
            usekeyset = ISC_TRUE;
            break;
        case 'v':
            verbose = strtol(isc_commandline_argument, &endp, 0);
            if (*endp != '\0')
                fatal("-v must be followed by a number");
            break;
        case 'F':
            /* Reserved for FIPS mode */
            /* FALLTHROUGH */
        case '?':
            if (isc_commandline_option != '?')
                fprintf(stderr, "%s: invalid argument -%c\n",
                    program, isc_commandline_option);
            /* FALLTHROUGH */
        case 'h':
            usage();

        default:
            fprintf(stderr, "%s: unhandled option -%c\n",
                program, isc_commandline_option);
            exit(1);
        }
    }

    if (algname != NULL) {
        if (strcasecmp(algname, "SHA1") == 0 ||
            strcasecmp(algname, "SHA-1") == 0)
            dtype = DNS_DSDIGEST_SHA1;
        else if (strcasecmp(algname, "SHA256") == 0 ||
             strcasecmp(algname, "SHA-256") == 0)
            dtype = DNS_DSDIGEST_SHA256;
        else
            fatal("unknown algorithm %s", algname);
    }

    rdclass = strtoclass(classname);

    if (usekeyset && filename != NULL)
        fatal("cannot use both -s and -f");

    /* When not using -f, -A is implicit */
    if (filename == NULL)
        showall = ISC_TRUE;

    if (argc < isc_commandline_index + 1 && filename == NULL)
        fatal("the key file name was not specified");
    if (argc > isc_commandline_index + 1)
        fatal("extraneous arguments");

    if (ectx == NULL)
        setup_entropy(mctx, NULL, &ectx);
    result = isc_hash_create(mctx, ectx, DNS_NAME_MAXWIRE);
    if (result != ISC_R_SUCCESS)
        fatal("could not initialize hash");
    result = dst_lib_init(mctx, ectx,
                  ISC_ENTROPY_BLOCKING | ISC_ENTROPY_GOODONLY);
    if (result != ISC_R_SUCCESS)
        fatal("could not initialize dst");
    isc_entropy_stopcallbacksources(ectx);

    setup_logging(verbose, mctx, &log);

    dns_rdataset_init(&rdataset);

    if (usekeyset || filename != NULL) {
        if (argc < isc_commandline_index + 1 && filename != NULL) {
            /* using zone name as the zone file name */
            namestr = filename;
        } else
            namestr = argv[isc_commandline_index];

        result = initname(namestr);
        if (result != ISC_R_SUCCESS)
            fatal("could not initialize name %s", namestr);

        if (usekeyset)
            result = loadkeyset(dir, &rdataset);
        else
            result = loadsetfromfile(filename, &rdataset);

        if (result != ISC_R_SUCCESS)
            fatal("could not load DNSKEY set: %s\n",
                  isc_result_totext(result));

        for (result = dns_rdataset_first(&rdataset);
             result == ISC_R_SUCCESS;
             result = dns_rdataset_next(&rdataset)) {
            dns_rdata_init(&rdata);
            dns_rdataset_current(&rdataset, &rdata);

            if (verbose > 2)
                logkey(&rdata);

            if (both) {
                emit(DNS_DSDIGEST_SHA1, showall, lookaside,
                                     &rdata);
                emit(DNS_DSDIGEST_SHA256, showall, lookaside,
                                     &rdata);
            } else
                emit(dtype, showall, lookaside, &rdata);
        }
    } else {
        unsigned char key_buf[DST_KEY_MAXSIZE];

        loadkey(argv[isc_commandline_index], key_buf,
            DST_KEY_MAXSIZE, &rdata);

        if (both) {
            emit(DNS_DSDIGEST_SHA1, showall, lookaside, &rdata);
            emit(DNS_DSDIGEST_SHA256, showall, lookaside, &rdata);
        } else
            emit(dtype, showall, lookaside, &rdata);
    }

    if (dns_rdataset_isassociated(&rdataset))
        dns_rdataset_disassociate(&rdataset);
    cleanup_logging(&log);
    dst_lib_destroy();
    isc_hash_destroy();
    cleanup_entropy(&ectx);
    dns_name_destroy();
    if (verbose > 10)
        isc_mem_stats(mctx, stdout);
    isc_mem_destroy(&mctx);

    fflush(stdout);
    if (ferror(stdout)) {
        fprintf(stderr, "write error\n");
        return (1);
    } else
        return (0);
}