dnssec-keygen.c revision 81ab85fd39c3f6c781ecac725d830364a311479d
af9dbf1ccdd53933aaae9300d13ce0965d39b067Evan Hunt/*
3b922eeb6294d579edfd720ac162287e6736e07aTinderbox User * Portions Copyright (c) 1995-2000 by Network Associates, Inc.
0c27b3fe77ac1d5094ba3521e8142d9e7973133fMark Andrews *
bf8267aa453e5d2a735ed732a043b77a0b355b20Mark Andrews * Permission to use, copy modify, and distribute this software for any
0c27b3fe77ac1d5094ba3521e8142d9e7973133fMark Andrews * purpose with or without fee is hereby granted, provided that the above
0c27b3fe77ac1d5094ba3521e8142d9e7973133fMark Andrews * copyright notice and this permission notice appear in all copies.
0c27b3fe77ac1d5094ba3521e8142d9e7973133fMark Andrews *
47798e626d8804dab2a003e21b55b633511fc8b1Mark Andrews * THE SOFTWARE IS PROVIDED "AS IS" AND NETWORK ASSOCIATES
af9dbf1ccdd53933aaae9300d13ce0965d39b067Evan Hunt * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
af9dbf1ccdd53933aaae9300d13ce0965d39b067Evan Hunt * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
af9dbf1ccdd53933aaae9300d13ce0965d39b067Evan Hunt * TRUSTED INFORMATION SYSTEMS BE LIABLE FOR ANY SPECIAL, DIRECT,
af9dbf1ccdd53933aaae9300d13ce0965d39b067Evan Hunt * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
af9dbf1ccdd53933aaae9300d13ce0965d39b067Evan Hunt * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
af9dbf1ccdd53933aaae9300d13ce0965d39b067Evan Hunt * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
8d59536d7c24e137f2bb1796b962bbafd8cac701Evan Hunt * WITH THE USE OR PERFORMANCE OF THE SOFTWARE.
8d59536d7c24e137f2bb1796b962bbafd8cac701Evan Hunt */
87a40683bf81a4a18291c093b7da67ca46760607Mark Andrews
af9dbf1ccdd53933aaae9300d13ce0965d39b067Evan Hunt/* $Id: dnssec-keygen.c,v 1.20 2000/05/17 22:47:56 bwelling Exp $ */
87a40683bf81a4a18291c093b7da67ca46760607Mark Andrews
87a40683bf81a4a18291c093b7da67ca46760607Mark Andrews#include <config.h>
#include <stdlib.h>
#include <isc/buffer.h>
#include <isc/commandline.h>
#include <isc/mem.h>
#include <isc/region.h>
#include <isc/string.h>
#include <isc/util.h>
#include <dns/keyvalues.h>
#include <dns/secalg.h>
#include <dst/dst.h>
#include <dst/result.h>
#define PROGRAM "keygen"
#define MAX_RSA 2048 /* XXX ogud update this when rsa library is updated */
static int verbose;
static inline void
fatal(char *format, ...) {
va_list args;
fprintf(stderr, "%s: ", PROGRAM);
va_start(args, format);
vfprintf(stderr, format, args);
va_end(args);
fprintf(stderr, "\n");
exit(1);
}
static inline void
check_result(isc_result_t result, char *message) {
if (result != ISC_R_SUCCESS) {
fprintf(stderr, "%s: %s: %s\n", PROGRAM, message,
isc_result_totext(result));
exit(1);
}
}
/* Not thread-safe! */
static char *
algtostr(const dns_secalg_t alg) {
isc_buffer_t b;
isc_region_t r;
isc_result_t result;
static char data[10];
isc_buffer_init(&b, data, sizeof(data));
result = dns_secalg_totext(alg, &b);
check_result(result, "dns_secalg_totext()");
isc_buffer_usedregion(&b, &r);
r.base[r.length] = 0;
return (char *) r.base;
}
static isc_boolean_t
dsa_size_ok(int size) {
return (ISC_TF(size >= 512 && size <= 1024 && size % 64 == 0));
}
static void
usage(char *prog) {
printf("Usage:\n");
printf(" %s [options] name\n\n", prog);
printf("Required options:\n");
printf(" -a algorithm: RSA | RSAMD5 | DH | DSA | HMAC-MD5\n");
printf(" -b key size, in bits:\n");
printf(" RSA:\t\t[512..%d]\n", MAX_RSA);
printf(" DH:\t\t[128..4096]\n");
printf(" DSA:\t\t[512..1024] and dividable by 64\n");
printf(" HMAC-MD5:\t[1..512]\n");
printf(" -n nametype: ZONE | HOST | ENTITY | USER\n");
printf(" name: owner of the key\n");
printf("Other options:\n");
printf(" -e use large exponent (RSA only)\n");
printf(" -g use specified generator (DH only)\n");
printf(" -t type: AUTHCONF | NOAUTHCONF | NOAUTH | NOCONF\n");
printf(" default: AUTHCONF\n");
printf(" -p protocol value\n");
printf(" default: 2 (email) for User keys, "
"3 (dnssec) for all others\n");
printf(" -s strength value this key signs DNS records with\n");
printf(" default: 0\n");
printf(" -v verbose level\n");
exit (-1);
}
int
main(int argc, char **argv) {
char *algname = NULL, *nametype = NULL, *type = NULL;
char *prog, *endp;
dst_key_t *key, *oldkey;
char *name = NULL;
isc_uint16_t flags = 0;
dns_secalg_t alg;
isc_boolean_t conflict = ISC_FALSE, null_key = ISC_FALSE;
isc_mem_t *mctx = NULL;
int ch, rsa_exp = 0, generator = 0, param = 0;
int protocol = -1, size = -1, signatory = 0;
isc_result_t ret;
isc_textregion_t r;
char filename[255];
isc_buffer_t buf;
RUNTIME_CHECK(isc_mem_create(0, 0, &mctx) == ISC_R_SUCCESS);
if ((prog = strrchr(argv[0],'/')) == NULL)
prog = isc_mem_strdup(mctx, argv[0]);
else
prog = isc_mem_strdup(mctx, ++prog);
if (prog == NULL)
fatal("out of memory");
if (argc == 1)
usage(prog);
while ((ch = isc_commandline_parse(argc, argv,
"a:b:eg:n:t:p:s:hv:")) != -1)
{
switch (ch) {
case 'a':
algname = isc_mem_strdup(mctx,
isc_commandline_argument);
if (algname == NULL)
fatal("out of memory");
break;
case 'b':
size = strtol(isc_commandline_argument, &endp, 10);
if (*endp != '\0' || size < 0)
fatal("-b requires a non-negative number");
break;
case 'e':
rsa_exp = 1;
break;
case 'g':
generator = strtol(isc_commandline_argument, &endp, 10);
if (*endp != '\0' || generator <= 0)
fatal("-g requires a positive number");
break;
case 'n':
nametype = isc_mem_strdup(mctx,
isc_commandline_argument);
if (nametype == NULL)
fatal("out of memory");
break;
case 't':
type = isc_mem_strdup(mctx, isc_commandline_argument);
if (type == NULL)
fatal("out of memory");
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 '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 'v':
endp = NULL;
verbose = strtol(isc_commandline_argument, &endp, 0);
if (*endp != '\0')
fatal("-v must be followed by a number");
break;
case 'h':
usage(prog);
default:
fprintf(stderr, "keygen: invalid argument -%c\n", ch);
usage(prog);
}
}
if (argc < isc_commandline_index + 1)
fatal("the key name was not specified");
if (argc > isc_commandline_index + 1)
fatal("extraneous arguments");
if (algname == NULL)
fatal("no algorithm was specified");
if (strcasecmp(algname, "RSA") == 0)
alg = DNS_KEYALG_RSA;
else if (strcasecmp(algname, "HMAC-MD5") == 0)
alg = DST_ALG_HMACMD5;
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 (dst_algorithm_supported(alg) == ISC_FALSE)
fatal("unsupported algorithm %s", algname);
if (type != NULL) {
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)
fatal("key size not specified (-b option)");
switch (alg) {
case DNS_KEYALG_RSA:
if (size != 0 && (size < 512 || 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:
if (size != 0 && !dsa_size_ok(size))
fatal("Invalid DSS key size: %d", size);
break;
case DST_ALG_HMACMD5:
if (size < 1 || size > 512)
fatal("HMAC-MD5 key size %d out of range", size);
break;
}
if (alg != DNS_KEYALG_RSA && rsa_exp != 0)
fatal("specified RSA exponent without RSA");
if (alg != DNS_KEYALG_DH && generator != 0)
fatal("specified DH generator without DH");
if (nametype == NULL)
fatal("no nametype specified");
if (strcasecmp(nametype, "zone") == 0)
flags |= DNS_KEYOWNER_ZONE;
else 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 nametype %s", nametype);
flags |= signatory;
if (protocol == -1) {
if ((flags & DNS_KEYFLAG_OWNERMASK) == DNS_KEYOWNER_USER)
protocol = DNS_KEYPROTO_EMAIL;
else
protocol = DNS_KEYPROTO_DNSSEC;
}
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");
}
name = isc_mem_allocate(mctx, strlen(argv[isc_commandline_index]) + 2);
if (name == NULL)
fatal("out of memory");
strcpy(name, argv[isc_commandline_index]);
if (name[strlen(name) - 1] != '.') {
strcat(name, ".");
fprintf(stderr,
"keygen: added a trailing dot to fully qualify "
"the name\n");
}
switch(alg) {
case DNS_KEYALG_RSA:
param = rsa_exp;
break;
case DNS_KEYALG_DH:
param = generator;
break;
case DNS_KEYALG_DSA:
case DST_ALG_HMACMD5:
param = 0;
break;
}
if ((flags & DNS_KEYFLAG_TYPEMASK) == DNS_KEYTYPE_NOKEY)
null_key = ISC_TRUE;
isc_buffer_init(&buf, filename, sizeof(filename) - 1);
dst_result_register();
do {
conflict = ISC_FALSE;
oldkey = NULL;
/* generate the key */
ret = dst_key_generate(name, alg, size, param, flags, protocol,
mctx, &key);
if (ret != ISC_R_SUCCESS) {
fatal("failed to generate key %s/%d: %s\n", name, alg,
dst_result_totext(ret));
exit(-1);
}
/*
* Try to read a key with the same name, alg and id from disk.
* If there is one we must continue generating a new one
* unless we were asked to generate a null key, in which
* case we return failure.
*/
ret = dst_key_fromfile(name, dst_key_id(key), alg,
DST_TYPE_PRIVATE, mctx, &oldkey);
/* do not overwrite an existing key */
if (ret == ISC_R_SUCCESS) {
dst_key_free(oldkey);
conflict = ISC_TRUE;
if (null_key)
break;
}
if (conflict == ISC_TRUE)
dst_key_free(key);
} while (conflict == ISC_TRUE);
if (conflict)
fatal("cannot generate a null key when a key with id 0 "
"already exists");
ret = dst_key_tofile(key, DST_TYPE_PUBLIC | DST_TYPE_PRIVATE);
if (ret != ISC_R_SUCCESS)
fatal("failed to write key %s/%s/%d: %s\n", name,
dst_key_id(key), algtostr(alg), isc_result_totext(ret));
isc_buffer_clear(&buf);
ret = dst_key_buildfilename(key, 0, &buf);
filename[isc_buffer_usedlength(&buf)] = 0;
printf("%s\n", filename);
isc_mem_free(mctx, name);
isc_mem_free(mctx, algname);
isc_mem_free(mctx, nametype);
isc_mem_free(mctx, prog);
if (type != NULL)
isc_mem_free(mctx, type);
dst_key_free(key);
isc_mem_destroy(&mctx);
return (0);
}