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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
/*! \file */
#include "keygen.h"
#include <stdarg.h>
#include <stdlib.h>
#include <isc/base64.h>
#include <isc/buffer.h>
#include <isc/file.h>
#include <isc/mem.h>
#include <isc/print.h>
#include <isc/result.h>
#include <isc/string.h>
#include <dns/keyvalues.h>
#include <dns/name.h>
#include <dst/dst.h>
#include <confgen/os.h>
#include "util.h"
/*%
* Convert string to algorithm type.
*/
dns_secalg_t
alg_fromtext(const char *name) {
const char *p = name;
if (strncasecmp(p, "hmac-", 5) == 0) {
p = &name[5];
}
if (strcasecmp(p, "md5") == 0) {
return (DST_ALG_HMACMD5);
}
if (strcasecmp(p, "sha1") == 0) {
return (DST_ALG_HMACSHA1);
}
if (strcasecmp(p, "sha224") == 0) {
return (DST_ALG_HMACSHA224);
}
if (strcasecmp(p, "sha256") == 0) {
return (DST_ALG_HMACSHA256);
}
if (strcasecmp(p, "sha384") == 0) {
return (DST_ALG_HMACSHA384);
}
if (strcasecmp(p, "sha512") == 0) {
return (DST_ALG_HMACSHA512);
}
return (DST_ALG_UNKNOWN);
}
/*%
* Return default keysize for a given algorithm type.
*/
int
alg_bits(dns_secalg_t alg) {
switch (alg) {
case DST_ALG_HMACMD5:
return (128);
case DST_ALG_HMACSHA1:
return (160);
case DST_ALG_HMACSHA224:
return (224);
case DST_ALG_HMACSHA256:
return (256);
case DST_ALG_HMACSHA384:
return (384);
case DST_ALG_HMACSHA512:
return (512);
default:
return (0);
}
}
/*%
* Generate a key of size 'keysize' and place it in 'key_txtbuffer'
*/
void
generate_key(isc_mem_t *mctx, dns_secalg_t alg, int keysize,
isc_buffer_t *key_txtbuffer) {
isc_result_t result = ISC_R_SUCCESS;
isc_buffer_t key_rawbuffer;
isc_region_t key_rawregion;
char key_rawsecret[64];
dst_key_t *key = NULL;
switch (alg) {
case DST_ALG_HMACMD5:
case DST_ALG_HMACSHA1:
case DST_ALG_HMACSHA224:
case DST_ALG_HMACSHA256:
if (keysize < 1 || keysize > 512) {
fatal("keysize %d out of range (must be 1-512)\n",
keysize);
}
break;
case DST_ALG_HMACSHA384:
case DST_ALG_HMACSHA512:
if (keysize < 1 || keysize > 1024) {
fatal("keysize %d out of range (must be 1-1024)\n",
keysize);
}
break;
default:
fatal("unsupported algorithm %d\n", alg);
}
DO("initialize dst library", dst_lib_init(mctx, NULL));
DO("generate key",
dst_key_generate(dns_rootname, alg, keysize, 0, 0, DNS_KEYPROTO_ANY,
dns_rdataclass_in, mctx, &key, NULL));
isc_buffer_init(&key_rawbuffer, &key_rawsecret, sizeof(key_rawsecret));
DO("dump key to buffer", dst_key_tobuffer(key, &key_rawbuffer));
isc_buffer_usedregion(&key_rawbuffer, &key_rawregion);
DO("bsse64 encode secret",
isc_base64_totext(&key_rawregion, -1, "", key_txtbuffer));
if (key != NULL) {
dst_key_free(&key);
}
dst_lib_destroy();
}
/*%
* Write a key file to 'keyfile'. If 'user' is non-NULL,
* make that user the owner of the file. The key will have
* the name 'keyname' and the secret in the buffer 'secret'.
*/
void
write_key_file(const char *keyfile, const char *user, const char *keyname,
isc_buffer_t *secret, dns_secalg_t alg) {
isc_result_t result;
const char *algname = dst_hmac_algorithm_totext(alg);
FILE *fd = NULL;
DO("create keyfile", isc_file_safecreate(keyfile, &fd));
if (user != NULL) {
if (set_user(fd, user) == -1) {
fatal("unable to set file owner\n");
}
}
fprintf(fd,
"key \"%s\" {\n\talgorithm %s;\n"
"\tsecret \"%.*s\";\n};\n",
keyname, algname, (int)isc_buffer_usedlength(secret),
(char *)isc_buffer_base(secret));
fflush(fd);
if (ferror(fd)) {
fatal("write to %s failed\n", keyfile);
}
if (fclose(fd)) {
fatal("fclose(%s) failed\n", keyfile);
}
}
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