dnssec-keygen.c

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/*
 * Portions Copyright (C) 2004-2015  Internet Systems Consortium, Inc. ("ISC")
 * Portions Copyright (C) 1999-2003  Internet Software Consortium.
 *
 * 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 AND NETWORK ASSOCIATES 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.
 *
 * Portions Copyright (C) 1995-2000 by Network Associates, Inc.
 *
 * 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 AND NETWORK ASSOCIATES 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.
 */

/*! \file */

#include <config.h>

#include <ctype.h>
#include <stdlib.h>
#include <unistd.h>

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

#include <dns/dnssec.h>
#include <dns/fixedname.h>
#include <dns/keyvalues.h>
#include <dns/log.h>
#include <dns/name.h>
#include <dns/rdataclass.h>
#include <dns/result.h>
#include <dns/secalg.h>

#include <dst/dst.h>

#ifdef PKCS11CRYPTO
#include <pk11/result.h>
#endif

#include "dnssectool.h"

#define MAX_RSA 4096 /* should be long enough... */

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

#define DEFAULT_ALGORITHM "RSASHA1"
#define DEFAULT_NSEC3_ALGORITHM "NSEC3RSASHA1"

ISC_PLATFORM_NORETURN_PRE static void
usage(void) ISC_PLATFORM_NORETURN_POST;

static void progress(int p);

static void
usage(void) {
        fprintf(stderr, "Usage:\n");
        fprintf(stderr, "    %s [options] name\n\n", program);
        fprintf(stderr, "Version: %s\n", VERSION);
        fprintf(stderr, "    name: owner of the key\n");
        fprintf(stderr, "Options:\n");
        fprintf(stderr, "    -K <directory>: write keys into directory\n");
        fprintf(stderr, "    -a <algorithm>:\n");
        fprintf(stderr, "        RSA | RSAMD5 | DSA | RSASHA1 | NSEC3RSASHA1"
                                " | NSEC3DSA |\n");
        fprintf(stderr, "        RSASHA256 | RSASHA512 | ECCGOST |\n");
        fprintf(stderr, "        ECDSAP256SHA256 | ECDSAP384SHA384 |\n");
        fprintf(stderr, "        DH | HMAC-MD5 | HMAC-SHA1 | HMAC-SHA224 | "
                                "HMAC-SHA256 | \n");
        fprintf(stderr, "        HMAC-SHA384 | HMAC-SHA512\n");
        fprintf(stderr, "       (default: RSASHA1, or "
                               "NSEC3RSASHA1 if using -3)\n");
        fprintf(stderr, "    -3: use NSEC3-capable algorithm\n");
        fprintf(stderr, "    -b <key size in bits>:\n");
        fprintf(stderr, "        RSAMD5:\t[512..%d]\n", MAX_RSA);
        fprintf(stderr, "        RSASHA1:\t[512..%d]\n", MAX_RSA);
        fprintf(stderr, "        NSEC3RSASHA1:\t[512..%d]\n", MAX_RSA);
        fprintf(stderr, "        RSASHA256:\t[512..%d]\n", MAX_RSA);
        fprintf(stderr, "        RSASHA512:\t[1024..%d]\n", MAX_RSA);
        fprintf(stderr, "        DH:\t\t[128..4096]\n");
        fprintf(stderr, "        DSA:\t\t[512..1024] and divisible by 64\n");
        fprintf(stderr, "        NSEC3DSA:\t[512..1024] and divisible "
                                "by 64\n");
        fprintf(stderr, "        ECCGOST:\tignored\n");
        fprintf(stderr, "        ECDSAP256SHA256:\tignored\n");
        fprintf(stderr, "        ECDSAP384SHA384:\tignored\n");
        fprintf(stderr, "        HMAC-MD5:\t[1..512]\n");
        fprintf(stderr, "        HMAC-SHA1:\t[1..160]\n");
        fprintf(stderr, "        HMAC-SHA224:\t[1..224]\n");
        fprintf(stderr, "        HMAC-SHA256:\t[1..256]\n");
        fprintf(stderr, "        HMAC-SHA384:\t[1..384]\n");
        fprintf(stderr, "        HMAC-SHA512:\t[1..512]\n");
        fprintf(stderr, "        (if using the default algorithm, key size\n"
                        "        defaults to 2048 for KSK, or 1024 for all "
                        "others)\n");
        fprintf(stderr, "    -n <nametype>: ZONE | HOST | ENTITY | "
                                            "USER | OTHER\n");
        fprintf(stderr, "        (DNSKEY generation defaults to ZONE)\n");
        fprintf(stderr, "    -c <class>: (default: IN)\n");
        fprintf(stderr, "    -d <digest bits> (0 => max, default)\n");
        fprintf(stderr, "    -E <engine>:\n");
#if defined(PKCS11CRYPTO)
        fprintf(stderr, "        path to PKCS#11 provider library "
                                "(default is %s)\n", PK11_LIB_LOCATION);
#elif defined(USE_PKCS11)
        fprintf(stderr, "        name of an OpenSSL engine to use "
                                "(default is \"pkcs11\")\n");
#else
        fprintf(stderr, "        name of an OpenSSL engine to use\n");
#endif
        fprintf(stderr, "    -f <keyflag>: KSK | REVOKE\n");
        fprintf(stderr, "    -g <generator>: use specified generator "
                        "(DH only)\n");
        fprintf(stderr, "    -L <ttl>: default key TTL\n");
        fprintf(stderr, "    -p <protocol>: (default: 3 [dnssec])\n");
        fprintf(stderr, "    -r <randomdev>: a file containing random data\n");
        fprintf(stderr, "    -s <strength>: strength value this key signs DNS "
                        "records with (default: 0)\n");
        fprintf(stderr, "    -T <rrtype>: DNSKEY | KEY (default: DNSKEY; "
                        "use KEY for SIG(0))\n");
        fprintf(stderr, "    -t <type>: "
                        "AUTHCONF | NOAUTHCONF | NOAUTH | NOCONF "
                        "(default: AUTHCONF)\n");
        fprintf(stderr, "    -h: print usage and exit\n");
        fprintf(stderr, "    -m <memory debugging mode>:\n");
        fprintf(stderr, "       usage | trace | record | size | mctx\n");
        fprintf(stderr, "    -v <level>: set verbosity level (0 - 10)\n");
        fprintf(stderr, "    -V: print version information\n");
        fprintf(stderr, "Timing options:\n");
        fprintf(stderr, "    -P date/[+-]offset/none: set key publication date "
                                                "(default: now)\n");
        fprintf(stderr, "    -A date/[+-]offset/none: set key activation date "
                                                "(default: now)\n");
        fprintf(stderr, "    -R date/[+-]offset/none: set key "
                                                     "revocation date\n");
        fprintf(stderr, "    -I date/[+-]offset/none: set key "
                                                     "inactivation date\n");
        fprintf(stderr, "    -D date/[+-]offset/none: set key deletion date\n");
        fprintf(stderr, "    -G: generate key only; do not set -P or -A\n");
        fprintf(stderr, "    -C: generate a backward-compatible key, omitting "
                        "all dates\n");
        fprintf(stderr, "    -S <key>: generate a successor to an existing "
                                      "key\n");
        fprintf(stderr, "    -i <interval>: prepublication interval for "
                                           "successor key "
                                           "(default: 30 days)\n");
        fprintf(stderr, "Output:\n");
        fprintf(stderr, "     K<name>+<alg>+<id>.key, "
                        "K<name>+<alg>+<id>.private\n");

        exit (-1);
}

static isc_boolean_t
dsa_size_ok(int size) {
        return (ISC_TF(size >= 512 && size <= 1024 && size % 64 == 0));
}

static void
progress(int p)
{
        char c = '*';

        switch (p) {
        case 0:
                c = '.';
                break;
        case 1:
                c = '+';
                break;
        case 2:
                c = '*';
                break;
        case 3:
                c = ' ';
                break;
        default:
                break;
        }
        (void) putc(c, stderr);
        (void) fflush(stderr);
}

int
main(int argc, char **argv) {
        char            *algname = NULL, *freeit = NULL;
        char            *nametype = NULL, *type = NULL;
        char            *classname = NULL;
        char            *endp;
        dst_key_t       *key = NULL;
        dns_fixedname_t fname;
        dns_name_t      *name;
        isc_uint16_t    flags = 0, kskflag = 0, revflag = 0;
        dns_secalg_t    alg;
        isc_boolean_t   conflict = ISC_FALSE, null_key = ISC_FALSE;
        isc_boolean_t   oldstyle = ISC_FALSE;
        isc_mem_t       *mctx = NULL;
        int             ch, generator = 0, param = 0;
        int             protocol = -1, size = -1, signatory = 0;
        isc_result_t    ret;
        isc_textregion_t r;
        char            filename[255];
        const char      *directory = NULL;
        const char      *predecessor = NULL;
        dst_key_t       *prevkey = NULL;
        isc_buffer_t    buf;
        isc_log_t       *log = NULL;
        isc_entropy_t   *ectx = NULL;
#ifdef USE_PKCS11
        const char      *engine = PKCS11_ENGINE;
#else
        const char      *engine = NULL;
#endif
        dns_rdataclass_t rdclass;
        int             options = DST_TYPE_PRIVATE | DST_TYPE_PUBLIC;
        int             dbits = 0;
        dns_ttl_t       ttl = 0;
        isc_boolean_t   use_default = ISC_FALSE, use_nsec3 = ISC_FALSE;
        isc_stdtime_t   publish = 0, activate = 0, revokekey = 0;
        isc_stdtime_t   inactive = 0, delete = 0;
        isc_stdtime_t   now;
        int             prepub = -1;
        isc_boolean_t   setpub = ISC_FALSE, setact = ISC_FALSE;
        isc_boolean_t   setrev = ISC_FALSE, setinact = ISC_FALSE;
        isc_boolean_t   setdel = ISC_FALSE, setttl = ISC_FALSE;
        isc_boolean_t   unsetpub = ISC_FALSE, unsetact = ISC_FALSE;
        isc_boolean_t   unsetrev = ISC_FALSE, unsetinact = ISC_FALSE;
        isc_boolean_t   unsetdel = ISC_FALSE;
        isc_boolean_t   genonly = ISC_FALSE;
        isc_boolean_t   quiet = ISC_FALSE;
        isc_boolean_t   show_progress = ISC_FALSE;
        unsigned char   c;

        if (argc == 1)
                usage();

#ifdef PKCS11CRYPTO
        pk11_result_register();
#endif
        dns_result_register();

        isc_commandline_errprint = ISC_FALSE;

        /*
         * Process memory debugging argument first.
         */
#define CMDLINE_FLAGS "3A:a:b:Cc:D:d:E:eFf:Gg:hI:i:K:kL:m:n:P:p:qR:r:S:s:T:t:" \
                      "v:V"
        while ((ch = isc_commandline_parse(argc, argv, CMDLINE_FLAGS)) != -1) {
                switch (ch) {
                case 'm':
                        if (strcasecmp(isc_commandline_argument, "record") == 0)
                                isc_mem_debugging |= ISC_MEM_DEBUGRECORD;
                        if (strcasecmp(isc_commandline_argument, "trace") == 0)
                                isc_mem_debugging |= ISC_MEM_DEBUGTRACE;
                        if (strcasecmp(isc_commandline_argument, "usage") == 0)
                                isc_mem_debugging |= ISC_MEM_DEBUGUSAGE;
                        if (strcasecmp(isc_commandline_argument, "size") == 0)
                                isc_mem_debugging |= ISC_MEM_DEBUGSIZE;
                        if (strcasecmp(isc_commandline_argument, "mctx") == 0)
                                isc_mem_debugging |= ISC_MEM_DEBUGCTX;
                        break;
                default:
                        break;
                }
        }
        isc_commandline_reset = ISC_TRUE;

        RUNTIME_CHECK(isc_mem_create(0, 0, &mctx) == ISC_R_SUCCESS);

        isc_stdtime_get(&now);

        while ((ch = isc_commandline_parse(argc, argv, CMDLINE_FLAGS)) != -1) {
            switch (ch) {
                case '3':
                        use_nsec3 = ISC_TRUE;
                        break;
                case 'a':
                        algname = isc_commandline_argument;
                        break;
                case 'b':
                        size = strtol(isc_commandline_argument, &endp, 10);
                        if (*endp != '\0' || size < 0)
                                fatal("-b requires a non-negative number");
                        break;
                case 'C':
                        oldstyle = ISC_TRUE;
                        break;
                case 'c':
                        classname = isc_commandline_argument;
                        break;
                case 'd':
                        dbits = strtol(isc_commandline_argument, &endp, 10);
                        if (*endp != '\0' || dbits < 0)
                                fatal("-d requires a non-negative number");
                        break;
                case 'E':
                        engine = isc_commandline_argument;
                        break;
                case 'e':
                        fprintf(stderr,
                                "phased-out option -e "
                                "(was 'use (RSA) large exponent)\n");
                        break;
                case 'f':
                        c = (unsigned char)(isc_commandline_argument[0]);
                        if (toupper(c) == 'K')
                                kskflag = DNS_KEYFLAG_KSK;
                        else if (toupper(c) == 'R')
                                revflag = DNS_KEYFLAG_REVOKE;
                        else
                                fatal("unknown flag '%s'",
                                      isc_commandline_argument);
                        break;
                case 'g':
                        generator = strtol(isc_commandline_argument,
                                           &endp, 10);
                        if (*endp != '\0' || generator <= 0)
                                fatal("-g requires a positive number");
                        break;
                case 'K':
                        directory = isc_commandline_argument;
                        ret = try_dir(directory);
                        if (ret != ISC_R_SUCCESS)
                                fatal("cannot open directory %s: %s",
                                      directory, isc_result_totext(ret));
                        break;
                case 'k':
                        fatal("The -k option has been deprecated.\n"
                              "To generate a key-signing key, use -f KSK.\n"
                              "To generate a key with TYPE=KEY, use -T KEY.\n");
                        break;
                case 'L':
                        ttl = strtottl(isc_commandline_argument);
                        setttl = ISC_TRUE;
                        break;
                case 'n':
                        nametype = isc_commandline_argument;
                        break;
                case 'm':
                        break;
                case 'p':
                        protocol = strtol(isc_commandline_argument, &endp, 10);
                        if (*endp != '\0' || protocol < 0 || protocol > 255)
                                fatal("-p must be followed by a number "
                                      "[0..255]");
                        break;
                case 'q':
                        quiet = ISC_TRUE;
                        break;
                case 'r':
                        setup_entropy(mctx, isc_commandline_argument, &ectx);
                        break;
                case 's':
                        signatory = strtol(isc_commandline_argument,
                                           &endp, 10);
                        if (*endp != '\0' || signatory < 0 || signatory > 15)
                                fatal("-s must be followed by a number "
                                      "[0..15]");
                        break;
                case 'T':
                        if (strcasecmp(isc_commandline_argument, "KEY") == 0)
                                options |= DST_TYPE_KEY;
                        else if (strcasecmp(isc_commandline_argument,
                                 "DNSKEY") == 0)
                                /* default behavior */
                                ;
                        else
                                fatal("unknown type '%s'",
                                      isc_commandline_argument);
                        break;
                case 't':
                        type = isc_commandline_argument;
                        break;
                case 'v':
                        endp = NULL;
                        verbose = strtol(isc_commandline_argument, &endp, 0);
                        if (*endp != '\0')
                                fatal("-v must be followed by a number");
                        break;
                case 'z':
                        /* already the default */
                        break;
                case 'G':
                        genonly = ISC_TRUE;
                        break;
                case 'P':
                        if (setpub || unsetpub)
                                fatal("-P specified more than once");

                        publish = strtotime(isc_commandline_argument,
                                            now, now, &setpub);
                        unsetpub = !setpub;
                        break;
                case 'A':
                        if (setact || unsetact)
                                fatal("-A specified more than once");

                        activate = strtotime(isc_commandline_argument,
                                             now, now, &setact);
                        unsetact = !setact;
                        break;
                case 'R':
                        if (setrev || unsetrev)
                                fatal("-R specified more than once");

                        revokekey = strtotime(isc_commandline_argument,
                                           now, now, &setrev);
                        unsetrev = !setrev;
                        break;
                case 'I':
                        if (setinact || unsetinact)
                                fatal("-I specified more than once");

                        inactive = strtotime(isc_commandline_argument,
                                             now, now, &setinact);
                        unsetinact = !setinact;
                        break;
                case 'D':
                        if (setdel || unsetdel)
                                fatal("-D specified more than once");

                        delete = strtotime(isc_commandline_argument,
                                           now, now, &setdel);
                        unsetdel = !setdel;
                        break;
                case 'S':
                        predecessor = isc_commandline_argument;
                        break;
                case 'i':
                        prepub = strtottl(isc_commandline_argument);
                        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':
                        /* Does not return. */
                        usage();

                case 'V':
                        /* Does not return. */
                        version(program);

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

        if (!isatty(0))
                quiet = ISC_TRUE;

        if (ectx == NULL)
                setup_entropy(mctx, NULL, &ectx);
        ret = dst_lib_init2(mctx, ectx, engine,
                            ISC_ENTROPY_BLOCKING | ISC_ENTROPY_GOODONLY);
        if (ret != ISC_R_SUCCESS)
                fatal("could not initialize dst: %s",
                      isc_result_totext(ret));

        setup_logging(mctx, &log);

        if (predecessor == NULL) {
                if (prepub == -1)
                        prepub = 0;

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

                dns_fixedname_init(&fname);
                name = dns_fixedname_name(&fname);
                isc_buffer_init(&buf, argv[isc_commandline_index],
                                strlen(argv[isc_commandline_index]));
                isc_buffer_add(&buf, strlen(argv[isc_commandline_index]));
                ret = dns_name_fromtext(name, &buf, dns_rootname, 0, NULL);
                if (ret != ISC_R_SUCCESS)
                        fatal("invalid key name %s: %s",
                              argv[isc_commandline_index],
                              isc_result_totext(ret));

                if (algname == NULL) {
                        use_default = ISC_TRUE;
                        if (use_nsec3)
                                algname = strdup(DEFAULT_NSEC3_ALGORITHM);
                        else
                                algname = strdup(DEFAULT_ALGORITHM);
                        if (algname == NULL)
                                fatal("strdup failed");
                        freeit = algname;
                        if (verbose > 0)
                                fprintf(stderr, "no algorithm specified; "
                                                "defaulting to %s\n", algname);
                }

                if (strcasecmp(algname, "RSA") == 0) {
                        fprintf(stderr, "The use of RSA (RSAMD5) is not "
                                        "recommended.\nIf you still wish to "
                                        "use RSA (RSAMD5) please specify "
                                        "\"-a RSAMD5\"\n");
                        INSIST(freeit == NULL);
                        return (1);
                } else if (strcasecmp(algname, "HMAC-MD5") == 0)
                        alg = DST_ALG_HMACMD5;
                else if (strcasecmp(algname, "HMAC-SHA1") == 0)
                        alg = DST_ALG_HMACSHA1;
                else if (strcasecmp(algname, "HMAC-SHA224") == 0)
                        alg = DST_ALG_HMACSHA224;
                else if (strcasecmp(algname, "HMAC-SHA256") == 0)
                        alg = DST_ALG_HMACSHA256;
                else if (strcasecmp(algname, "HMAC-SHA384") == 0)
                        alg = DST_ALG_HMACSHA384;
                else if (strcasecmp(algname, "HMAC-SHA512") == 0)
                        alg = DST_ALG_HMACSHA512;
                else {
                        r.base = algname;
                        r.length = strlen(algname);
                        ret = dns_secalg_fromtext(&alg, &r);
                        if (ret != ISC_R_SUCCESS)
                                fatal("unknown algorithm %s", algname);
                        if (alg == DST_ALG_DH)
                                options |= DST_TYPE_KEY;
                }

                if (!dst_algorithm_supported(alg))
                        fatal("unsupported algorithm: %d", alg);

                if (use_nsec3 &&
                    alg != DST_ALG_NSEC3DSA && alg != DST_ALG_NSEC3RSASHA1 &&
                    alg != DST_ALG_RSASHA256 && alg!= DST_ALG_RSASHA512 &&
                    alg != DST_ALG_ECCGOST &&
                    alg != DST_ALG_ECDSA256 && alg != DST_ALG_ECDSA384) {
                        fatal("%s is incompatible with NSEC3; "
                              "do not use the -3 option", algname);
                }

                if (type != NULL && (options & DST_TYPE_KEY) != 0) {
                        if (strcasecmp(type, "NOAUTH") == 0)
                                flags |= DNS_KEYTYPE_NOAUTH;
                        else if (strcasecmp(type, "NOCONF") == 0)
                                flags |= DNS_KEYTYPE_NOCONF;
                        else if (strcasecmp(type, "NOAUTHCONF") == 0) {
                                flags |= (DNS_KEYTYPE_NOAUTH |
                                          DNS_KEYTYPE_NOCONF);
                                if (size < 0)
                                        size = 0;
                        }
                        else if (strcasecmp(type, "AUTHCONF") == 0)
                                /* nothing */;
                        else
                                fatal("invalid type %s", type);
                }

                if (size < 0) {
                        if (use_default) {
                                if ((kskflag & DNS_KEYFLAG_KSK) != 0)
                                        size = 2048;
                                else
                                        size = 1024;
                                if (verbose > 0)
                                        fprintf(stderr, "key size not "
                                                        "specified; defaulting"
                                                        " to %d\n", size);
                        } else if (alg != DST_ALG_ECCGOST &&
                                   alg != DST_ALG_ECDSA256 &&
                                   alg != DST_ALG_ECDSA384)
                                fatal("key size not specified (-b option)");
                }

                if (!oldstyle && prepub > 0) {
                        if (setpub && setact && (activate - prepub) < publish)
                                fatal("Activation and publication dates "
                                      "are closer together than the\n\t"
                                      "prepublication interval.");

                        if (!setpub && !setact) {
                                setpub = setact = ISC_TRUE;
                                publish = now;
                                activate = now + prepub;
                        } else if (setpub && !setact) {
                                setact = ISC_TRUE;
                                activate = publish + prepub;
                        } else if (setact && !setpub) {
                                setpub = ISC_TRUE;
                                publish = activate - prepub;
                        }

                        if ((activate - prepub) < now)
                                fatal("Time until activation is shorter "
                                      "than the\n\tprepublication interval.");
                }
        } else {
                char keystr[DST_KEY_FORMATSIZE];
                isc_stdtime_t when;
                int major, minor;

                if (prepub == -1)
                        prepub = (30 * 86400);

                if (algname != NULL)
                        fatal("-S and -a cannot be used together");
                if (size >= 0)
                        fatal("-S and -b cannot be used together");
                if (nametype != NULL)
                        fatal("-S and -n cannot be used together");
                if (type != NULL)
                        fatal("-S and -t cannot be used together");
                if (setpub || unsetpub)
                        fatal("-S and -P cannot be used together");
                if (setact || unsetact)
                        fatal("-S and -A cannot be used together");
                if (use_nsec3)
                        fatal("-S and -3 cannot be used together");
                if (oldstyle)
                        fatal("-S and -C cannot be used together");
                if (genonly)
                        fatal("-S and -G cannot be used together");

                ret = dst_key_fromnamedfile(predecessor, directory,
                                            DST_TYPE_PUBLIC | DST_TYPE_PRIVATE,
                                            mctx, &prevkey);
                if (ret != ISC_R_SUCCESS)
                        fatal("Invalid keyfile %s: %s",
                              predecessor, isc_result_totext(ret));
                if (!dst_key_isprivate(prevkey))
                        fatal("%s is not a private key", predecessor);

                name = dst_key_name(prevkey);
                alg = dst_key_alg(prevkey);
                size = dst_key_size(prevkey);
                flags = dst_key_flags(prevkey);

                dst_key_format(prevkey, keystr, sizeof(keystr));
                dst_key_getprivateformat(prevkey, &major, &minor);
                if (major != DST_MAJOR_VERSION || minor < DST_MINOR_VERSION)
                        fatal("Key %s has incompatible format version %d.%d\n\t"
                              "It is not possible to generate a successor key.",
                              keystr, major, minor);

                ret = dst_key_gettime(prevkey, DST_TIME_ACTIVATE, &when);
                if (ret != ISC_R_SUCCESS)
                        fatal("Key %s has no activation date.\n\t"
                              "You must use dnssec-settime -A to set one "
                              "before generating a successor.", keystr);

                ret = dst_key_gettime(prevkey, DST_TIME_INACTIVE, &activate);
                if (ret != ISC_R_SUCCESS)
                        fatal("Key %s has no inactivation date.\n\t"
                              "You must use dnssec-settime -I to set one "
                              "before generating a successor.", keystr);

                publish = activate - prepub;
                if (publish < now)
                        fatal("Key %s becomes inactive\n\t"
                              "sooner than the prepublication period "
                              "for the new key ends.\n\t"
                              "Either change the inactivation date with "
                              "dnssec-settime -I,\n\t"
                              "or use the -i option to set a shorter "
                              "prepublication interval.", keystr);

                ret = dst_key_gettime(prevkey, DST_TIME_DELETE, &when);
                if (ret != ISC_R_SUCCESS)
                        fprintf(stderr, "%s: WARNING: Key %s has no removal "
                                        "date;\n\t it will remain in the zone "
                                        "indefinitely after rollover.\n\t "
                                        "You can use dnssec-settime -D to "
                                        "change this.\n", program, keystr);

                setpub = setact = ISC_TRUE;
        }

        switch (alg) {
        case DNS_KEYALG_RSAMD5:
        case DNS_KEYALG_RSASHA1:
        case DNS_KEYALG_NSEC3RSASHA1:
        case DNS_KEYALG_RSASHA256:
                if (size != 0 && (size < 512 || size > MAX_RSA))
                        fatal("RSA key size %d out of range", size);
                break;
        case DNS_KEYALG_RSASHA512:
                if (size != 0 && (size < 1024 || size > MAX_RSA))
                        fatal("RSA key size %d out of range", size);
                break;
        case DNS_KEYALG_DH:
                if (size != 0 && (size < 128 || size > 4096))
                        fatal("DH key size %d out of range", size);
                break;
        case DNS_KEYALG_DSA:
        case DNS_KEYALG_NSEC3DSA:
                if (size != 0 && !dsa_size_ok(size))
                        fatal("invalid DSS key size: %d", size);
                break;
        case DST_ALG_ECCGOST:
                size = 256;
                break;
        case DST_ALG_ECDSA256:
                size = 256;
                break;
        case DST_ALG_ECDSA384:
                size = 384;
                break;
        case DST_ALG_HMACMD5:
                options |= DST_TYPE_KEY;
                if (size < 1 || size > 512)
                        fatal("HMAC-MD5 key size %d out of range", size);
                if (dbits != 0 && (dbits < 80 || dbits > 128))
                        fatal("HMAC-MD5 digest bits %d out of range", dbits);
                if ((dbits % 8) != 0)
                        fatal("HMAC-MD5 digest bits %d not divisible by 8",
                              dbits);
                break;
        case DST_ALG_HMACSHA1:
                options |= DST_TYPE_KEY;
                if (size < 1 || size > 160)
                        fatal("HMAC-SHA1 key size %d out of range", size);
                if (dbits != 0 && (dbits < 80 || dbits > 160))
                        fatal("HMAC-SHA1 digest bits %d out of range", dbits);
                if ((dbits % 8) != 0)
                        fatal("HMAC-SHA1 digest bits %d not divisible by 8",
                              dbits);
                break;
        case DST_ALG_HMACSHA224:
                options |= DST_TYPE_KEY;
                if (size < 1 || size > 224)
                        fatal("HMAC-SHA224 key size %d out of range", size);
                if (dbits != 0 && (dbits < 112 || dbits > 224))
                        fatal("HMAC-SHA224 digest bits %d out of range", dbits);
                if ((dbits % 8) != 0)
                        fatal("HMAC-SHA224 digest bits %d not divisible by 8",
                              dbits);
                break;
        case DST_ALG_HMACSHA256:
                options |= DST_TYPE_KEY;
                if (size < 1 || size > 256)
                        fatal("HMAC-SHA256 key size %d out of range", size);
                if (dbits != 0 && (dbits < 128 || dbits > 256))
                        fatal("HMAC-SHA256 digest bits %d out of range", dbits);
                if ((dbits % 8) != 0)
                        fatal("HMAC-SHA256 digest bits %d not divisible by 8",
                              dbits);
                break;
        case DST_ALG_HMACSHA384:
                options |= DST_TYPE_KEY;
                if (size < 1 || size > 384)
                        fatal("HMAC-384 key size %d out of range", size);
                if (dbits != 0 && (dbits < 192 || dbits > 384))
                        fatal("HMAC-SHA384 digest bits %d out of range", dbits);
                if ((dbits % 8) != 0)
                        fatal("HMAC-SHA384 digest bits %d not divisible by 8",
                              dbits);
                break;
        case DST_ALG_HMACSHA512:
                options |= DST_TYPE_KEY;
                if (size < 1 || size > 512)
                        fatal("HMAC-SHA512 key size %d out of range", size);
                if (dbits != 0 && (dbits < 256 || dbits > 512))
                        fatal("HMAC-SHA512 digest bits %d out of range", dbits);
                if ((dbits % 8) != 0)
                        fatal("HMAC-SHA512 digest bits %d not divisible by 8",
                              dbits);
                break;
        }

        if (alg != DNS_KEYALG_DH && generator != 0)
                fatal("specified DH generator for a non-DH key");

        if (nametype == NULL) {
                if ((options & DST_TYPE_KEY) != 0) /* KEY / HMAC */
                        fatal("no nametype specified");
                flags |= DNS_KEYOWNER_ZONE;     /* DNSKEY */
        } else if (strcasecmp(nametype, "zone") == 0)
                flags |= DNS_KEYOWNER_ZONE;
        else if ((options & DST_TYPE_KEY) != 0) { /* KEY / HMAC */
                if (strcasecmp(nametype, "host") == 0 ||
                         strcasecmp(nametype, "entity") == 0)
                        flags |= DNS_KEYOWNER_ENTITY;
                else if (strcasecmp(nametype, "user") == 0)
                        flags |= DNS_KEYOWNER_USER;
                else
                        fatal("invalid KEY nametype %s", nametype);
        } else if (strcasecmp(nametype, "other") != 0) /* DNSKEY */
                fatal("invalid DNSKEY nametype %s", nametype);

        rdclass = strtoclass(classname);

        if (directory == NULL)
                directory = ".";

        if ((options & DST_TYPE_KEY) != 0)  /* KEY / HMAC */
                flags |= signatory;
        else if ((flags & DNS_KEYOWNER_ZONE) != 0) { /* DNSKEY */
                flags |= kskflag;
                flags |= revflag;
        }

        if (protocol == -1)
                protocol = DNS_KEYPROTO_DNSSEC;
        else if ((options & DST_TYPE_KEY) == 0 &&
                 protocol != DNS_KEYPROTO_DNSSEC)
                fatal("invalid DNSKEY protocol: %d", protocol);

        if ((flags & DNS_KEYFLAG_TYPEMASK) == DNS_KEYTYPE_NOKEY) {
                if (size > 0)
                        fatal("specified null key with non-zero size");
                if ((flags & DNS_KEYFLAG_SIGNATORYMASK) != 0)
                        fatal("specified null key with signing authority");
        }

        if ((flags & DNS_KEYFLAG_OWNERMASK) == DNS_KEYOWNER_ZONE &&
            (alg == DNS_KEYALG_DH || alg == DST_ALG_HMACMD5 ||
             alg == DST_ALG_HMACSHA1 || alg == DST_ALG_HMACSHA224 ||
             alg == DST_ALG_HMACSHA256 || alg == DST_ALG_HMACSHA384 ||
             alg == DST_ALG_HMACSHA512))
                fatal("a key with algorithm '%s' cannot be a zone key",
                      algname);

        switch(alg) {
        case DNS_KEYALG_RSAMD5:
        case DNS_KEYALG_RSASHA1:
        case DNS_KEYALG_NSEC3RSASHA1:
        case DNS_KEYALG_RSASHA256:
        case DNS_KEYALG_RSASHA512:
                show_progress = ISC_TRUE;
                break;

        case DNS_KEYALG_DH:
                param = generator;
                break;

        case DNS_KEYALG_DSA:
        case DNS_KEYALG_NSEC3DSA:
        case DST_ALG_ECCGOST:
        case DST_ALG_ECDSA256:
        case DST_ALG_ECDSA384:
                show_progress = ISC_TRUE;
                /* fall through */

        case DST_ALG_HMACMD5:
        case DST_ALG_HMACSHA1:
        case DST_ALG_HMACSHA224:
        case DST_ALG_HMACSHA256:
        case DST_ALG_HMACSHA384:
        case DST_ALG_HMACSHA512:
                param = 0;
                break;
        }

        if ((flags & DNS_KEYFLAG_TYPEMASK) == DNS_KEYTYPE_NOKEY)
                null_key = ISC_TRUE;

        isc_buffer_init(&buf, filename, sizeof(filename) - 1);

        do {
                conflict = ISC_FALSE;

                if (!quiet && show_progress) {
                        fprintf(stderr, "Generating key pair.");
                        ret = dst_key_generate2(name, alg, size, param, flags,
                                                protocol, rdclass, mctx, &key,
                                                &progress);
                        putc('\n', stderr);
                        fflush(stderr);
                } else {
                        ret = dst_key_generate2(name, alg, size, param, flags,
                                                protocol, rdclass, mctx, &key,
                                                NULL);
                }

                isc_entropy_stopcallbacksources(ectx);

                if (ret != ISC_R_SUCCESS) {
                        char namestr[DNS_NAME_FORMATSIZE];
                        char algstr[DNS_SECALG_FORMATSIZE];
                        dns_name_format(name, namestr, sizeof(namestr));
                        dns_secalg_format(alg, algstr, sizeof(algstr));
                        fatal("failed to generate key %s/%s: %s\n",
                              namestr, algstr, isc_result_totext(ret));
                        /* NOTREACHED */
                        exit(-1);
                }

                dst_key_setbits(key, dbits);

                /*
                 * Set key timing metadata (unless using -C)
                 *
                 * Creation date is always set to "now".
                 *
                 * For a new key without an explicit predecessor, publish
                 * and activation dates are set to "now" by default, but
                 * can both be overridden.
                 *
                 * For a successor key, activation is set to match the
                 * predecessor's inactivation date.  Publish is set to 30
                 * days earlier than that (XXX: this should be configurable).
                 * If either of the resulting dates are in the past, that's
                 * an error; the inactivation date of the predecessor key
                 * must be updated before a successor key can be created.
                 */
                if (!oldstyle) {
                        dst_key_settime(key, DST_TIME_CREATED, now);

                        if (genonly && (setpub || setact))
                                fatal("cannot use -G together with "
                                      "-P or -A options");

                        if (setpub)
                                dst_key_settime(key, DST_TIME_PUBLISH, publish);
                        else if (setact && !unsetpub)
                                dst_key_settime(key, DST_TIME_PUBLISH,
                                                activate - prepub);
                        else if (!genonly && !unsetpub)
                                dst_key_settime(key, DST_TIME_PUBLISH, now);

                        if (setact)
                                dst_key_settime(key, DST_TIME_ACTIVATE,
                                                activate);
                        else if (!genonly && !unsetact)
                                dst_key_settime(key, DST_TIME_ACTIVATE, now);

                        if (setrev) {
                                if (kskflag == 0)
                                        fprintf(stderr, "%s: warning: Key is "
                                                "not flagged as a KSK, but -R "
                                                "was used. Revoking a ZSK is "
                                                "legal, but undefined.\n",
                                                program);
                                dst_key_settime(key, DST_TIME_REVOKE, revokekey);
                        }

                        if (setinact)
                                dst_key_settime(key, DST_TIME_INACTIVE,
                                                inactive);

                        if (setdel) {
                                if (setinact && delete < inactive)
                                        fprintf(stderr, "%s: warning: Key is "
                                                "scheduled to be deleted "
                                                "before it is scheduled to be "
                                                "made inactive.\n",
                                                program);
                                dst_key_settime(key, DST_TIME_DELETE, delete);
                        }
                } else {
                        if (setpub || setact || setrev || setinact ||
                            setdel || unsetpub || unsetact ||
                            unsetrev || unsetinact || unsetdel || genonly)
                                fatal("cannot use -C together with "
                                      "-P, -A, -R, -I, -D, or -G options");
                        /*
                         * Compatibility mode: Private-key-format
                         * should be set to 1.2.
                         */
                        dst_key_setprivateformat(key, 1, 2);
                }

                /* Set the default key TTL */
                if (setttl)
                        dst_key_setttl(key, ttl);

                /*
                 * Do not overwrite an existing key, or create a key
                 * if there is a risk of ID collision due to this key
                 * or another key being revoked.
                 */
                if (key_collision(key, name, directory, mctx, NULL)) {
                        conflict = ISC_TRUE;
                        if (null_key) {
                                dst_key_free(&key);
                                break;
                        }

                        if (verbose > 0) {
                                isc_buffer_clear(&buf);
                                ret = dst_key_buildfilename(key, 0,
                                                            directory, &buf);
                                if (ret == ISC_R_SUCCESS)
                                        fprintf(stderr,
                                                "%s: %s already exists, or "
                                                "might collide with another "
                                                "key upon revokation.  "
                                                "Generating a new key\n",
                                                program, filename);
                        }

                        dst_key_free(&key);
                }
        } while (conflict == ISC_TRUE);

        if (conflict)
                fatal("cannot generate a null key due to possible key ID "
                      "collision");

        ret = dst_key_tofile(key, options, directory);
        if (ret != ISC_R_SUCCESS) {
                char keystr[DST_KEY_FORMATSIZE];
                dst_key_format(key, keystr, sizeof(keystr));
                fatal("failed to write key %s: %s\n", keystr,
                      isc_result_totext(ret));
        }

        isc_buffer_clear(&buf);
        ret = dst_key_buildfilename(key, 0, NULL, &buf);
        if (ret != ISC_R_SUCCESS)
                fatal("dst_key_buildfilename returned: %s\n",
                      isc_result_totext(ret));
        printf("%s\n", filename);
        dst_key_free(&key);
        if (prevkey != NULL)
                dst_key_free(&prevkey);

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

        if (freeit != NULL)
                free(freeit);

        return (0);
}

---