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
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
#include <openssl/evp.h>
#include <crypto/s2n_openssl_evp.h>
#include <crypto/s2n_openssl_x509.h>
#include "error/s2n_errno.h"
#include "crypto/s2n_rsa_pss.h"
#include "crypto/s2n_pkey.h"
#include "utils/s2n_safety.h"
int s2n_pkey_zero_init(struct s2n_pkey *pkey)
{
pkey->pkey = NULL;
pkey->size = NULL;
pkey->sign = NULL;
pkey->verify = NULL;
pkey->encrypt = NULL;
pkey->decrypt = NULL;
pkey->match = NULL;
pkey->free = NULL;
pkey->check_key = NULL;
return 0;
}
int s2n_pkey_setup_for_type(struct s2n_pkey *pkey, s2n_pkey_type pkey_type)
{
switch(pkey_type) {
case S2N_PKEY_TYPE_RSA:
return s2n_rsa_pkey_init(pkey);
case S2N_PKEY_TYPE_ECDSA:
return s2n_ecdsa_pkey_init(pkey);
case S2N_PKEY_TYPE_RSA_PSS:
return s2n_rsa_pss_pkey_init(pkey);
case S2N_PKEY_TYPE_SENTINEL:
case S2N_PKEY_TYPE_UNKNOWN:
S2N_ERROR(S2N_ERR_CERT_TYPE_UNSUPPORTED);
}
S2N_ERROR(S2N_ERR_CERT_TYPE_UNSUPPORTED);
}
int s2n_pkey_check_key_exists(const struct s2n_pkey *pkey)
{
notnull_check(pkey->pkey);
notnull_check(pkey->check_key);
return pkey->check_key(pkey);
}
int s2n_pkey_size(const struct s2n_pkey *pkey)
{
notnull_check(pkey->size);
return pkey->size(pkey);
}
int s2n_pkey_sign(const struct s2n_pkey *pkey, s2n_signature_algorithm sig_alg,
struct s2n_hash_state *digest, struct s2n_blob *signature)
{
notnull_check(pkey->sign);
return pkey->sign(pkey, sig_alg, digest, signature);
}
int s2n_pkey_verify(const struct s2n_pkey *pkey, s2n_signature_algorithm sig_alg,
struct s2n_hash_state *digest, struct s2n_blob *signature)
{
notnull_check(pkey);
notnull_check(pkey->verify);
return pkey->verify(pkey, sig_alg, digest, signature);
}
int s2n_pkey_encrypt(const struct s2n_pkey *pkey, struct s2n_blob *in, struct s2n_blob *out)
{
notnull_check(pkey->encrypt);
return pkey->encrypt(pkey, in, out);
}
int s2n_pkey_decrypt(const struct s2n_pkey *pkey, struct s2n_blob *in, struct s2n_blob *out)
{
notnull_check(pkey->decrypt);
return pkey->decrypt(pkey, in, out);
}
int s2n_pkey_match(const struct s2n_pkey *pub_key, const struct s2n_pkey *priv_key)
{
notnull_check(pub_key->match);
S2N_ERROR_IF(pub_key->match != priv_key->match, S2N_ERR_KEY_MISMATCH);
return pub_key->match(pub_key, priv_key);
}
int s2n_pkey_free(struct s2n_pkey *key)
{
if (key != NULL && key->free != NULL) {
GUARD(key->free(key));
}
if (key->pkey != NULL) {
EVP_PKEY_free(key->pkey);
key->pkey = NULL;
}
return S2N_SUCCESS;
}
int s2n_asn1der_to_private_key(struct s2n_pkey *priv_key, struct s2n_blob *asn1der)
{
uint8_t *key_to_parse = asn1der->data;
/* Detect key type */
DEFER_CLEANUP(EVP_PKEY *evp_private_key = d2i_AutoPrivateKey(NULL, (const unsigned char **)(void *)&key_to_parse, asn1der->size),
EVP_PKEY_free_pointer);
S2N_ERROR_IF(evp_private_key == NULL, S2N_ERR_DECODE_PRIVATE_KEY);
/* If key parsing is successful, d2i_AutoPrivateKey increments *key_to_parse to the byte following the parsed data */
uint32_t parsed_len = key_to_parse - asn1der->data;
if (parsed_len != asn1der->size) {
S2N_ERROR(S2N_ERR_DECODE_PRIVATE_KEY);
}
/* Initialize s2n_pkey according to key type */
int type = EVP_PKEY_base_id(evp_private_key);
int ret;
switch (type) {
case EVP_PKEY_RSA:
ret = s2n_rsa_pkey_init(priv_key);
if (ret != 0) {
break;
}
ret = s2n_evp_pkey_to_rsa_private_key(&priv_key->key.rsa_key, evp_private_key);
break;
case EVP_PKEY_RSA_PSS:
ret = s2n_rsa_pss_pkey_init(priv_key);
if (ret != 0) {
break;
}
ret = s2n_evp_pkey_to_rsa_pss_private_key(&priv_key->key.rsa_key, evp_private_key);
break;
case EVP_PKEY_EC:
ret = s2n_ecdsa_pkey_init(priv_key);
if (ret != 0) {
break;
}
ret = s2n_evp_pkey_to_ecdsa_private_key(&priv_key->key.ecdsa_key, evp_private_key);
break;
default:
S2N_ERROR(S2N_ERR_DECODE_PRIVATE_KEY);
}
priv_key->pkey = evp_private_key;
/* Reset to avoid DEFER_CLEANUP freeing our key */
evp_private_key = NULL;
return ret;
}
int s2n_asn1der_to_public_key_and_type(struct s2n_pkey *pub_key, s2n_pkey_type *pkey_type_out, struct s2n_blob *asn1der)
{
uint8_t *cert_to_parse = asn1der->data;
DEFER_CLEANUP(X509 *cert = NULL, X509_free_pointer);
cert = d2i_X509(NULL, (const unsigned char **)(void *)&cert_to_parse, asn1der->size);
S2N_ERROR_IF(cert == NULL, S2N_ERR_DECODE_CERTIFICATE);
/* If cert parsing is successful, d2i_X509 increments *cert_to_parse to the byte following the parsed data */
uint32_t parsed_len = cert_to_parse - asn1der->data;
/* Some TLS clients in the wild send one extra trailing byte after the Certificate.
* Allow this in s2n for backwards compatibility with existing clients. */
uint32_t trailing_bytes = asn1der->size - parsed_len;
ENSURE_POSIX(trailing_bytes <= 1, S2N_ERR_DECODE_CERTIFICATE);
DEFER_CLEANUP(EVP_PKEY *evp_public_key = X509_get_pubkey(cert), EVP_PKEY_free_pointer);
S2N_ERROR_IF(evp_public_key == NULL, S2N_ERR_DECODE_CERTIFICATE);
/* Check for success in decoding certificate according to type */
int type = EVP_PKEY_base_id(evp_public_key);
int ret;
switch (type) {
case EVP_PKEY_RSA:
ret = s2n_rsa_pkey_init(pub_key);
if (ret != 0) {
break;
}
ret = s2n_evp_pkey_to_rsa_public_key(&pub_key->key.rsa_key, evp_public_key);
*pkey_type_out = S2N_PKEY_TYPE_RSA;
break;
case EVP_PKEY_RSA_PSS:
ret = s2n_rsa_pss_pkey_init(pub_key);
if (ret != 0) {
break;
}
ret = s2n_evp_pkey_to_rsa_pss_public_key(&pub_key->key.rsa_key, evp_public_key);
*pkey_type_out = S2N_PKEY_TYPE_RSA_PSS;
break;
case EVP_PKEY_EC:
ret = s2n_ecdsa_pkey_init(pub_key);
if (ret != 0) {
break;
}
ret = s2n_evp_pkey_to_ecdsa_public_key(&pub_key->key.ecdsa_key, evp_public_key);
*pkey_type_out = S2N_PKEY_TYPE_ECDSA;
break;
default:
S2N_ERROR(S2N_ERR_DECODE_CERTIFICATE);
}
pub_key->pkey = evp_public_key;
/* Reset to avoid DEFER_CLEANUP freeing our key */
evp_public_key = NULL;
return ret;
}
|
