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Diffstat (limited to 'bin/confgen/keygen.c')
| -rw-r--r-- | bin/confgen/keygen.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/bin/confgen/keygen.c b/bin/confgen/keygen.c new file mode 100644 index 0000000..97dfa34 --- /dev/null +++ b/bin/confgen/keygen.c @@ -0,0 +1,178 @@ +/* + * 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); + } +} |