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
|
/* Copyright (C) 2020 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <gnutls/gnutls.h>
#include "libdnssec/error.h"
#include "libdnssec/key.h"
#include "libdnssec/key/algorithm.h"
#include "libdnssec/shared/shared.h"
/* -- internal ------------------------------------------------------------- */
struct limits {
unsigned min;
unsigned max;
unsigned def;
bool (*validate)(unsigned bits);
};
static const struct limits *get_limits(dnssec_key_algorithm_t algorithm)
{
static const struct limits RSA = {
.min = 1024,
.max = 4096,
.def = 2048,
};
static const struct limits EC256 = {
.min = 256,
.max = 256,
.def = 256,
};
static const struct limits EC384 = {
.min = 384,
.max = 384,
.def = 384,
};
static const struct limits ED25519 = {
.min = 256,
.max = 256,
.def = 256,
};
static const struct limits ED448 = {
.min = 456,
.max = 456,
.def = 456,
};
switch (algorithm) {
case DNSSEC_KEY_ALGORITHM_RSA_SHA1:
case DNSSEC_KEY_ALGORITHM_RSA_SHA1_NSEC3:
case DNSSEC_KEY_ALGORITHM_RSA_SHA256:
case DNSSEC_KEY_ALGORITHM_RSA_SHA512:
return &RSA;
case DNSSEC_KEY_ALGORITHM_ECDSA_P256_SHA256:
return &EC256;
case DNSSEC_KEY_ALGORITHM_ECDSA_P384_SHA384:
return &EC384;
case DNSSEC_KEY_ALGORITHM_ED25519:
return &ED25519;
case DNSSEC_KEY_ALGORITHM_ED448:
return &ED448;
default:
return NULL;
}
}
/* -- internal API --------------------------------------------------------- */
gnutls_pk_algorithm_t algorithm_to_gnutls(dnssec_key_algorithm_t dnssec)
{
switch (dnssec) {
case DNSSEC_KEY_ALGORITHM_RSA_SHA1:
case DNSSEC_KEY_ALGORITHM_RSA_SHA1_NSEC3:
case DNSSEC_KEY_ALGORITHM_RSA_SHA256:
case DNSSEC_KEY_ALGORITHM_RSA_SHA512:
return GNUTLS_PK_RSA;
case DNSSEC_KEY_ALGORITHM_ECDSA_P256_SHA256:
case DNSSEC_KEY_ALGORITHM_ECDSA_P384_SHA384:
return GNUTLS_PK_EC;
#ifdef HAVE_ED25519
case DNSSEC_KEY_ALGORITHM_ED25519:
return GNUTLS_PK_EDDSA_ED25519;
#endif
#ifdef HAVE_ED448
case DNSSEC_KEY_ALGORITHM_ED448:
return GNUTLS_PK_EDDSA_ED448;
#endif
default:
return GNUTLS_PK_UNKNOWN;
}
}
/* -- public API ----------------------------------------------------------- */
_public_
bool dnssec_algorithm_reproducible(dnssec_key_algorithm_t algorithm, bool enabled)
{
(void)enabled;
switch (algorithm) {
case DNSSEC_KEY_ALGORITHM_ED25519:
case DNSSEC_KEY_ALGORITHM_ED448:
return true; // those are always reproducible
case DNSSEC_KEY_ALGORITHM_ECDSA_P256_SHA256:
case DNSSEC_KEY_ALGORITHM_ECDSA_P384_SHA384:
#ifdef HAVE_GNUTLS_REPRODUCIBLE
return enabled; // Reproducible only if GnuTLS supports && enabled
#else
return false;
#endif
default:
return false;
}
}
_public_
int dnssec_algorithm_key_size_range(dnssec_key_algorithm_t algorithm,
unsigned *min_ptr, unsigned *max_ptr)
{
if (!min_ptr && !max_ptr) {
return DNSSEC_EINVAL;
}
const struct limits *limits = get_limits(algorithm);
if (!limits) {
return DNSSEC_INVALID_KEY_ALGORITHM;
}
if (min_ptr) {
*min_ptr = limits->min;
}
if (max_ptr) {
*max_ptr = limits->max;
}
return DNSSEC_EOK;
}
_public_
bool dnssec_algorithm_key_size_check(dnssec_key_algorithm_t algorithm,
unsigned bits)
{
const struct limits *limits = get_limits(algorithm);
if (!limits) {
return false;
}
if (bits < limits->min || bits > limits->max) {
return false;
}
if (limits->validate && !limits->validate(bits)) {
return false;
}
return true;
}
_public_
int dnssec_algorithm_key_size_default(dnssec_key_algorithm_t algorithm)
{
const struct limits *limits = get_limits(algorithm);
return limits ? limits->def : 0;
}
|
