bin/dnssec/dnssec-dsfromkey.c

/*
 * Copyright (C) 2008-2012  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.
 */

/* $Id$ */

/*! \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/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"

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

static dns_rdataclass_t rdclass;
static dns_fixedname_t  fixed;
static dns_name_t       *name = NULL;
static dns_db_t         *db = NULL;
static dns_dbnode_t     *node = NULL;
static dns_rdataset_t   keyset;
static isc_mem_t        *mctx = NULL;

static void
loadkeys(char *dirname, char *setname)
{
    isc_result_t     result;
    char             filename[1024];
    isc_buffer_t     buf;

    dns_rdataset_init(&keyset);
    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);
    if (result != ISC_R_SUCCESS)
        fatal("can't convert DNS name %s", setname);

    isc_buffer_init(&buf, filename, sizeof(filename));
    if (dirname != NULL) {
        if (isc_buffer_availablelength(&buf) < strlen(dirname))
            fatal("directory name '%s' too long", dirname);
        isc_buffer_putstr(&buf, dirname);
        if (dirname[strlen(dirname) - 1] != '/') {
            if (isc_buffer_availablelength(&buf) < 1)
                fatal("directory name '%s' too long", dirname);
            isc_buffer_putstr(&buf, "/");
        }
    }

    if (isc_buffer_availablelength(&buf) < strlen("keyset-"))
        fatal("directory name '%s' too long", dirname);
    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)
        fatal("name %s too long", setname);
    isc_buffer_putuint8(&buf, 0);

    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, &keyset, 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");
}

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_rdataset_init(&keyset);
    dns_rdata_init(rdata);

    isc_buffer_init(&keyb, key_buf, key_buf_size);

    result = dst_key_fromnamedfile(filename, 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
emitds(unsigned int dtype, dns_rdata_t *rdata)
{
    isc_result_t   result;
    unsigned char  buf[DNS_DS_BUFFERSIZE];
    char           text_buf[DST_KEY_MAXTEXTSIZE];
    char           class_buf[10];
    isc_buffer_t   textb, classb;
    isc_region_t   r;
    dns_rdata_t    ds;

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

    dns_rdata_init(&ds);

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

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

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

    result = dns_name_print(name, stdout);
    if (result != ISC_R_SUCCESS)
        fatal("can't print DS name");

    isc_buffer_usedregion(&classb, &r);
    printf(" %.*s", (int)r.length, r.base);

    isc_buffer_usedregion(&textb, &r);
    printf(" DS %.*s\n", (int)r.length, r.base);
}

ISC_PLATFORM_NORETURN_PRE static void
usage(void) ISC_PLATFORM_NORETURN_POST;

static void
usage(void) {
    fprintf(stderr, "Usage:\n");
    fprintf(stderr, "    %s options keyfile\n\n", program);
    fprintf(stderr, "    %s options [-c class] [-d dir] -s dnsname\n\n",
        program);
    fprintf(stderr, "Version: %s\n", VERSION);
    fprintf(stderr, "Options:\n");
    fprintf(stderr, "    -v <verbose level>\n");
    fprintf(stderr, "    -1: use SHA-1\n");
    fprintf(stderr, "    -2: use SHA-256\n");
    fprintf(stderr, "    -a algorithm: use algorithm\n");
    fprintf(stderr, "Keyset options:\n");
    fprintf(stderr, "    -s: keyset mode\n");
    fprintf(stderr, "    -c class\n");
    fprintf(stderr, "    -d directory\n");
    fprintf(stderr, "Output: DS RRs\n");

    exit (-1);
}

int
main(int argc, char **argv) {
    char           *algname = NULL, *classname = NULL, *dirname = NULL;
    char           *endp;
    int            ch;
    unsigned int   dtype = DNS_DSDIGEST_SHA1;
    isc_boolean_t  both = ISC_TRUE;
    isc_boolean_t  usekeyset = ISC_FALSE;
    isc_result_t   result;
    isc_log_t      *log = NULL;
    isc_entropy_t  *ectx = NULL;
    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,
                       "12a:c:d: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':
            algname = isc_commandline_argument;
            both = ISC_FALSE;
            break;
        case 'c':
            classname = isc_commandline_argument;
            break;
        case 'd':
            dirname = isc_commandline_argument;
            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 '?':
            if (isc_commandline_option != '?')
                fprintf(stderr, "%s: invalid argument -%c\n",
                    program, isc_commandline_option);
            /* Falls into */
        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 (argc < isc_commandline_index + 1)
        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);

    if (usekeyset) {
        loadkeys(dirname, argv[isc_commandline_index]);

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

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

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

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

        if (both) {
            emitds(DNS_DSDIGEST_SHA1, &rdata);
            emitds(DNS_DSDIGEST_SHA256, &rdata);
        } else
            emitds(dtype, &rdata);
    }

    if (dns_rdataset_isassociated(&keyset))
        dns_rdataset_disassociate(&keyset);
    if (node != NULL)
        dns_db_detachnode(db, &node);
    if (db != NULL)
        dns_db_detach(&db);
    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);
}