summaryrefslogtreecommitdiffstats
path: root/bin/tools/nsec3hash.c
blob: 2441bf13a837a745ae881110c6b53da5dd7c183d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
/*
 * 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.
 */

#include <stdarg.h>
#include <stdbool.h>
#include <stdlib.h>

#include <isc/base32.h>
#include <isc/buffer.h>
#include <isc/commandline.h>
#include <isc/file.h>
#include <isc/hex.h>
#include <isc/iterated_hash.h>
#include <isc/print.h>
#include <isc/result.h>
#include <isc/string.h>
#include <isc/types.h>
#include <isc/util.h>

#include <dns/fixedname.h>
#include <dns/name.h>
#include <dns/nsec3.h>
#include <dns/types.h>

const char *program = "nsec3hash";

ISC_PLATFORM_NORETURN_PRE static void
fatal(const char *format, ...) ISC_PLATFORM_NORETURN_POST;

static void
fatal(const 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 void
check_result(isc_result_t result, const char *message) {
	if (result != ISC_R_SUCCESS) {
		fatal("%s: %s", message, isc_result_totext(result));
	}
}

static void
usage() {
	fprintf(stderr, "Usage: %s salt algorithm iterations domain\n",
		program);
	fprintf(stderr, "       %s -r algorithm flags iterations salt domain\n",
		program);
	exit(1);
}

typedef void
nsec3printer(unsigned algo, unsigned flags, unsigned iters, const char *saltstr,
	     const char *domain, const char *digest);

static void
nsec3hash(nsec3printer *nsec3print, const char *algostr, const char *flagstr,
	  const char *iterstr, const char *saltstr, const char *domain) {
	dns_fixedname_t fixed;
	dns_name_t *name;
	isc_buffer_t buffer;
	isc_region_t region;
	isc_result_t result;
	unsigned char hash[NSEC3_MAX_HASH_LENGTH];
	unsigned char salt[DNS_NSEC3_SALTSIZE];
	unsigned char text[1024];
	unsigned int hash_alg;
	unsigned int flags;
	unsigned int length;
	unsigned int iterations;
	unsigned int salt_length;
	const char dash[] = "-";

	if (strcmp(saltstr, "-") == 0) {
		salt_length = 0;
		salt[0] = 0;
	} else {
		isc_buffer_init(&buffer, salt, sizeof(salt));
		result = isc_hex_decodestring(saltstr, &buffer);
		check_result(result, "isc_hex_decodestring(salt)");
		salt_length = isc_buffer_usedlength(&buffer);
		if (salt_length > DNS_NSEC3_SALTSIZE) {
			fatal("salt too long");
		}
		if (salt_length == 0) {
			saltstr = dash;
		}
	}
	hash_alg = atoi(algostr);
	if (hash_alg > 255U) {
		fatal("hash algorithm too large");
	}
	flags = flagstr == NULL ? 0 : atoi(flagstr);
	if (flags > 255U) {
		fatal("flags too large");
	}
	iterations = atoi(iterstr);
	if (iterations > 0xffffU) {
		fatal("iterations to large");
	}

	name = dns_fixedname_initname(&fixed);
	isc_buffer_constinit(&buffer, domain, strlen(domain));
	isc_buffer_add(&buffer, strlen(domain));
	result = dns_name_fromtext(name, &buffer, dns_rootname, 0, NULL);
	check_result(result, "dns_name_fromtext() failed");

	dns_name_downcase(name, name, NULL);
	length = isc_iterated_hash(hash, hash_alg, iterations, salt,
				   salt_length, name->ndata, name->length);
	if (length == 0) {
		fatal("isc_iterated_hash failed");
	}
	region.base = hash;
	region.length = length;
	isc_buffer_init(&buffer, text, sizeof(text));
	isc_base32hexnp_totext(&region, 1, "", &buffer);
	isc_buffer_putuint8(&buffer, '\0');

	nsec3print(hash_alg, flags, iterations, saltstr, domain, (char *)text);
}

static void
nsec3hash_print(unsigned algo, unsigned flags, unsigned iters,
		const char *saltstr, const char *domain, const char *digest) {
	UNUSED(flags);
	UNUSED(domain);

	fprintf(stdout, "%s (salt=%s, hash=%u, iterations=%u)\n", digest,
		saltstr, algo, iters);
}

static void
nsec3hash_rdata_print(unsigned algo, unsigned flags, unsigned iters,
		      const char *saltstr, const char *domain,
		      const char *digest) {
	fprintf(stdout, "%s NSEC3 %u %u %u %s %s\n", domain, algo, flags, iters,
		saltstr, digest);
}

int
main(int argc, char *argv[]) {
	bool rdata_format = false;
	int ch;

	while ((ch = isc_commandline_parse(argc, argv, "-r")) != -1) {
		switch (ch) {
		case 'r':
			rdata_format = true;
			break;
		case '-':
			isc_commandline_index -= 1;
			goto skip;
		default:
			break;
		}
	}

skip:
	argc -= isc_commandline_index;
	argv += isc_commandline_index;

	if (rdata_format) {
		if (argc != 5) {
			usage();
		}
		nsec3hash(nsec3hash_rdata_print, argv[0], argv[1], argv[2],
			  argv[3], argv[4]);
	} else {
		if (argc != 4) {
			usage();
		}
		nsec3hash(nsec3hash_print, argv[1], NULL, argv[2], argv[0],
			  argv[3]);
	}
	return (0);
}