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/*
* key2ds transforms a public key into its DS
* It (currently) prints out the public key
*
* (c) NLnet Labs, 2005 - 2008
* See the file LICENSE for the license
*/
#include "config.h"
#include <ldns/ldns.h>
#include <errno.h>
static void
usage(FILE *fp, char *prog) {
fprintf(fp, "%s [-fn] [-1|-2] keyfile\n", prog);
fprintf(fp, " Generate a DS RR from the DNSKEYS in keyfile\n");
fprintf(fp, " The following file will be created: ");
fprintf(fp, "K<name>+<alg>+<id>.ds\n");
fprintf(fp, " The base name (K<name>+<alg>+<id> will be printed to stdout\n");
fprintf(fp, "Options:\n");
fprintf(fp, " -f: ignore SEP flag (i.e. make DS records for any key)\n");
fprintf(fp, " -n: do not write DS records to file(s) but to stdout\n");
fprintf(fp, " (default) use similar hash to the key algorithm.\n");
fprintf(fp, " -1: use SHA1 for the DS hash\n");
fprintf(fp, " -2: use SHA256 for the DS hash\n");
#ifdef USE_GOST
fprintf(fp, " -g: use GOST for the DS hash\n");
#endif
#ifdef USE_ECDSA
fprintf(fp, " -4: use SHA384 for the DS hash\n");
#endif
}
static int
is_suitable_dnskey(ldns_rr *rr, int sep_only)
{
if (!rr || ldns_rr_get_type(rr) != LDNS_RR_TYPE_DNSKEY) {
return 0;
}
return !sep_only ||
(ldns_rdf2native_int16(ldns_rr_dnskey_flags(rr)) &
LDNS_KEY_SEP_KEY);
}
static ldns_hash
suitable_hash(ldns_signing_algorithm algorithm)
{
switch (algorithm) {
case LDNS_SIGN_RSASHA256:
case LDNS_SIGN_RSASHA512:
return LDNS_SHA256;
case LDNS_SIGN_ECC_GOST:
#ifdef USE_GOST
return LDNS_HASH_GOST;
#else
return LDNS_SHA256;
#endif
#ifdef USE_ECDSA
case LDNS_SIGN_ECDSAP256SHA256:
return LDNS_SHA256;
case LDNS_SIGN_ECDSAP384SHA384:
return LDNS_SHA384;
#endif
#ifdef USE_ED25519
case LDNS_SIGN_ED25519:
return LDNS_SHA256;
#endif
#ifdef USE_ED448
case LDNS_SIGN_ED448:
return LDNS_SHA256;
#endif
default: break;
}
return LDNS_SHA1;
}
int
main(int argc, char *argv[])
{
FILE *keyfp, *dsfp;
char *keyname;
char *dsname;
char *owner;
ldns_rr *k, *ds;
ldns_signing_algorithm alg;
ldns_hash h;
int similar_hash=1;
char *program = argv[0];
int nofile = 0;
ldns_rdf *origin = NULL;
ldns_status result = LDNS_STATUS_OK;
int sep_only = 1;
h = LDNS_SHA1;
argv++, argc--;
while (argc && argv[0][0] == '-') {
if (strcmp(argv[0], "-1") == 0) {
h = LDNS_SHA1;
similar_hash = 0;
}
if (strcmp(argv[0], "-2") == 0) {
h = LDNS_SHA256;
similar_hash = 0;
}
#ifdef USE_GOST
if (strcmp(argv[0], "-g") == 0) {
if(!ldns_key_EVP_load_gost_id()) {
fprintf(stderr, "error: libcrypto does not provide GOST\n");
exit(EXIT_FAILURE);
}
h = LDNS_HASH_GOST;
similar_hash = 0;
}
#endif
#ifdef USE_ECDSA
if (strcmp(argv[0], "-4") == 0) {
h = LDNS_SHA384;
similar_hash = 0;
}
#endif
if (strcmp(argv[0], "-f") == 0) {
sep_only = 0;
}
if (strcmp(argv[0], "-n") == 0) {
nofile=1;
}
argv++, argc--;
}
if (argc != 1) {
usage(stderr, program);
exit(EXIT_FAILURE);
}
keyname = strdup(argv[0]);
keyfp = fopen(keyname, "r");
if (!keyfp) {
fprintf(stderr, "Failed to open public key file %s: %s\n", keyname,
strerror(errno));
exit(EXIT_FAILURE);
}
while (result == LDNS_STATUS_OK) {
result = ldns_rr_new_frm_fp(&k, keyfp, 0, &origin, NULL);
while (result == LDNS_STATUS_SYNTAX_ORIGIN ||
result == LDNS_STATUS_SYNTAX_TTL ||
(result == LDNS_STATUS_OK && !is_suitable_dnskey(k, sep_only))
) {
if (result == LDNS_STATUS_OK) {
ldns_rr_free(k);
}
result = ldns_rr_new_frm_fp(&k, keyfp, 0, &origin, NULL);
}
if (result == LDNS_STATUS_SYNTAX_EMPTY) {
/* we're done */
break;
}
if (result != LDNS_STATUS_OK) {
fprintf(stderr, "Could not read public key from file %s: %s\n", keyname, ldns_get_errorstr_by_id(result));
exit(EXIT_FAILURE);
}
owner = ldns_rdf2str(ldns_rr_owner(k));
alg = ldns_rdf2native_int8(ldns_rr_dnskey_algorithm(k));
if(similar_hash)
h = suitable_hash(alg);
ds = ldns_key_rr2ds(k, h);
if (!ds) {
fprintf(stderr, "Conversion to a DS RR failed\n");
ldns_rr_free(k);
free(owner);
exit(EXIT_FAILURE);
}
/* print the public key RR to .key */
dsname = LDNS_XMALLOC(char, strlen(owner) + 16);
snprintf(dsname, strlen(owner) + 15, "K%s+%03u+%05u.ds", owner, alg, (unsigned int) ldns_calc_keytag(k));
if (nofile)
ldns_rr_print(stdout,ds);
else {
dsfp = fopen(dsname, "w");
if (!dsfp) {
fprintf(stderr, "Unable to open %s: %s\n", dsname, strerror(errno));
exit(EXIT_FAILURE);
} else {
ldns_rr_print(dsfp, ds);
fclose(dsfp);
fprintf(stdout, "K%s+%03u+%05u\n", owner, alg, (unsigned int) ldns_calc_keytag(k));
}
}
ldns_rr_free(ds);
ldns_rr_free(k);
free(owner);
LDNS_FREE(dsname);
}
fclose(keyfp);
free(keyname);
exit(EXIT_SUCCESS);
}
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