00b67f09dd
Also known as ISC bind. This import adds utilities such as host(1), dig(1), and nslookup(1), as well as many other tools and libraries. Change-Id: I035ca46e64f1965d57019e773f4ff0ef035e4aa3
229 lines
5.8 KiB
C
229 lines
5.8 KiB
C
/* $NetBSD: keygen.c,v 1.6 2014/12/10 04:37:51 christos Exp $ */
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/*
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* Copyright (C) 2009, 2012-2014 Internet Systems Consortium, Inc. ("ISC")
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/* Id: keygen.c,v 1.4 2009/11/12 14:02:38 marka Exp */
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/*! \file */
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#include <config.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <isc/base64.h>
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#include <isc/buffer.h>
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#include <isc/entropy.h>
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#include <isc/file.h>
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#include <isc/keyboard.h>
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#include <isc/mem.h>
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#include <isc/result.h>
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#include <isc/string.h>
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#include <dns/keyvalues.h>
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#include <dns/name.h>
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#include <dst/dst.h>
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#include <confgen/os.h>
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#include "util.h"
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#include "keygen.h"
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/*%
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* Convert algorithm type to string.
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*/
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const char *
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alg_totext(dns_secalg_t alg) {
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switch (alg) {
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case DST_ALG_HMACMD5:
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return "hmac-md5";
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case DST_ALG_HMACSHA1:
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return "hmac-sha1";
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case DST_ALG_HMACSHA224:
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return "hmac-sha224";
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case DST_ALG_HMACSHA256:
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return "hmac-sha256";
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case DST_ALG_HMACSHA384:
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return "hmac-sha384";
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case DST_ALG_HMACSHA512:
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return "hmac-sha512";
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default:
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return "(unknown)";
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}
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}
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/*%
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* Convert string to algorithm type.
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*/
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dns_secalg_t
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alg_fromtext(const char *name) {
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const char *p = name;
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if (strncasecmp(p, "hmac-", 5) == 0)
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p = &name[5];
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if (strcasecmp(p, "md5") == 0)
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return DST_ALG_HMACMD5;
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if (strcasecmp(p, "sha1") == 0)
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return DST_ALG_HMACSHA1;
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if (strcasecmp(p, "sha224") == 0)
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return DST_ALG_HMACSHA224;
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if (strcasecmp(p, "sha256") == 0)
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return DST_ALG_HMACSHA256;
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if (strcasecmp(p, "sha384") == 0)
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return DST_ALG_HMACSHA384;
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if (strcasecmp(p, "sha512") == 0)
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return DST_ALG_HMACSHA512;
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return DST_ALG_UNKNOWN;
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}
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/*%
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* Return default keysize for a given algorithm type.
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*/
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int
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alg_bits(dns_secalg_t alg) {
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switch (alg) {
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case DST_ALG_HMACMD5:
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return 128;
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case DST_ALG_HMACSHA1:
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return 160;
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case DST_ALG_HMACSHA224:
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return 224;
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case DST_ALG_HMACSHA256:
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return 256;
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case DST_ALG_HMACSHA384:
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return 384;
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case DST_ALG_HMACSHA512:
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return 512;
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default:
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return 0;
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}
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}
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/*%
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* Generate a key of size 'keysize' using entropy source 'randomfile',
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* and place it in 'key_txtbuffer'
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*/
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void
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generate_key(isc_mem_t *mctx, const char *randomfile, dns_secalg_t alg,
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int keysize, isc_buffer_t *key_txtbuffer) {
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isc_result_t result = ISC_R_SUCCESS;
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isc_entropysource_t *entropy_source = NULL;
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int open_keyboard = ISC_ENTROPY_KEYBOARDMAYBE;
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int entropy_flags = 0;
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isc_entropy_t *ectx = NULL;
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isc_buffer_t key_rawbuffer;
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isc_region_t key_rawregion;
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char key_rawsecret[64];
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dst_key_t *key = NULL;
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switch (alg) {
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case DST_ALG_HMACMD5:
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case DST_ALG_HMACSHA1:
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case DST_ALG_HMACSHA224:
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case DST_ALG_HMACSHA256:
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if (keysize < 1 || keysize > 512)
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fatal("keysize %d out of range (must be 1-512)\n",
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keysize);
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break;
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case DST_ALG_HMACSHA384:
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case DST_ALG_HMACSHA512:
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if (keysize < 1 || keysize > 1024)
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fatal("keysize %d out of range (must be 1-1024)\n",
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keysize);
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break;
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default:
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fatal("unsupported algorithm %d\n", alg);
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}
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DO("create entropy context", isc_entropy_create(mctx, &ectx));
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if (randomfile != NULL && strcmp(randomfile, "keyboard") == 0) {
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randomfile = NULL;
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open_keyboard = ISC_ENTROPY_KEYBOARDYES;
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}
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DO("start entropy source", isc_entropy_usebestsource(ectx,
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&entropy_source,
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randomfile,
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open_keyboard));
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entropy_flags = ISC_ENTROPY_BLOCKING | ISC_ENTROPY_GOODONLY;
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DO("initialize dst library", dst_lib_init(mctx, ectx, entropy_flags));
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DO("generate key", dst_key_generate(dns_rootname, alg,
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keysize, 0, 0,
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DNS_KEYPROTO_ANY,
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dns_rdataclass_in, mctx, &key));
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isc_buffer_init(&key_rawbuffer, &key_rawsecret, sizeof(key_rawsecret));
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DO("dump key to buffer", dst_key_tobuffer(key, &key_rawbuffer));
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isc_buffer_usedregion(&key_rawbuffer, &key_rawregion);
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DO("bsse64 encode secret", isc_base64_totext(&key_rawregion, -1, "",
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key_txtbuffer));
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/*
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* Shut down the entropy source now so the "stop typing" message
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* does not muck with the output.
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*/
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if (entropy_source != NULL)
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isc_entropy_destroysource(&entropy_source);
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if (key != NULL)
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dst_key_free(&key);
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isc_entropy_detach(&ectx);
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dst_lib_destroy();
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}
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/*%
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* Write a key file to 'keyfile'. If 'user' is non-NULL,
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* make that user the owner of the file. The key will have
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* the name 'keyname' and the secret in the buffer 'secret'.
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*/
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void
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write_key_file(const char *keyfile, const char *user,
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const char *keyname, isc_buffer_t *secret,
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dns_secalg_t alg) {
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isc_result_t result;
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const char *algname = alg_totext(alg);
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FILE *fd = NULL;
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DO("create keyfile", isc_file_safecreate(keyfile, &fd));
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if (user != NULL) {
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if (set_user(fd, user) == -1)
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fatal("unable to set file owner\n");
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}
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fprintf(fd, "key \"%s\" {\n\talgorithm %s;\n"
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"\tsecret \"%.*s\";\n};\n",
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keyname, algname,
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(int)isc_buffer_usedlength(secret),
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(char *)isc_buffer_base(secret));
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fflush(fd);
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if (ferror(fd))
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fatal("write to %s failed\n", keyfile);
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if (fclose(fd))
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fatal("fclose(%s) failed\n", keyfile);
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fprintf(stderr, "wrote key file \"%s\"\n", keyfile);
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}
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