Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * Copyright (c) 2019 Yubico AB. All rights reserved. |
3 | | * Use of this source code is governed by a BSD-style |
4 | | * license that can be found in the LICENSE file. |
5 | | */ |
6 | | |
7 | | #include <openssl/bn.h> |
8 | | #include <openssl/obj_mac.h> |
9 | | |
10 | | #include "fido.h" |
11 | | #include "fido/eddsa.h" |
12 | | |
13 | | #if defined(LIBRESSL_VERSION_NUMBER) |
14 | | EVP_PKEY * |
15 | | EVP_PKEY_new_raw_public_key(int type, ENGINE *e, const unsigned char *key, |
16 | | size_t keylen) |
17 | | { |
18 | | (void)type; |
19 | | (void)e; |
20 | | (void)key; |
21 | | (void)keylen; |
22 | | |
23 | | fido_log_debug("%s: unimplemented", __func__); |
24 | | |
25 | | return (NULL); |
26 | | } |
27 | | |
28 | | int |
29 | | EVP_PKEY_get_raw_public_key(const EVP_PKEY *pkey, unsigned char *pub, |
30 | | size_t *len) |
31 | | { |
32 | | (void)pkey; |
33 | | (void)pub; |
34 | | (void)len; |
35 | | |
36 | | fido_log_debug("%s: unimplemented", __func__); |
37 | | |
38 | | return (0); |
39 | | } |
40 | | |
41 | | int |
42 | | EVP_DigestVerify(EVP_MD_CTX *ctx, const unsigned char *sigret, size_t siglen, |
43 | | const unsigned char *tbs, size_t tbslen) |
44 | | { |
45 | | (void)ctx; |
46 | | (void)sigret; |
47 | | (void)siglen; |
48 | | (void)tbs; |
49 | | (void)tbslen; |
50 | | |
51 | | fido_log_debug("%s: unimplemented", __func__); |
52 | | |
53 | | return (0); |
54 | | } |
55 | | #endif /* LIBRESSL_VERSION_NUMBER */ |
56 | | |
57 | | static int |
58 | | decode_coord(const cbor_item_t *item, void *xy, size_t xy_len) |
59 | 232 | { |
60 | 232 | if (cbor_isa_bytestring(item) == false || |
61 | 232 | cbor_bytestring_is_definite(item) == false || |
62 | 232 | cbor_bytestring_length(item) != xy_len) { |
63 | 3 | fido_log_debug("%s: cbor type", __func__); |
64 | 3 | return (-1); |
65 | 3 | } |
66 | | |
67 | 229 | memcpy(xy, cbor_bytestring_handle(item), xy_len); |
68 | | |
69 | 229 | return (0); |
70 | 229 | } |
71 | | |
72 | | static int |
73 | | decode_pubkey_point(const cbor_item_t *key, const cbor_item_t *val, void *arg) |
74 | 959 | { |
75 | 959 | eddsa_pk_t *k = arg; |
76 | | |
77 | 959 | if (cbor_isa_negint(key) == false || |
78 | 959 | cbor_int_get_width(key) != CBOR_INT_8) |
79 | 484 | return (0); /* ignore */ |
80 | | |
81 | 475 | switch (cbor_get_uint8(key)) { |
82 | 232 | case 1: /* x coordinate */ |
83 | 232 | return (decode_coord(val, &k->x, sizeof(k->x))); |
84 | 243 | } |
85 | | |
86 | 243 | return (0); /* ignore */ |
87 | 243 | } |
88 | | |
89 | | int |
90 | | eddsa_pk_decode(const cbor_item_t *item, eddsa_pk_t *k) |
91 | 244 | { |
92 | 244 | if (cbor_isa_map(item) == false || |
93 | 244 | cbor_map_is_definite(item) == false || |
94 | 244 | cbor_map_iter(item, k, decode_pubkey_point) < 0) { |
95 | 7 | fido_log_debug("%s: cbor type", __func__); |
96 | 7 | return (-1); |
97 | 7 | } |
98 | | |
99 | 237 | return (0); |
100 | 237 | } |
101 | | |
102 | | eddsa_pk_t * |
103 | | eddsa_pk_new(void) |
104 | 2.58k | { |
105 | 2.58k | return (calloc(1, sizeof(eddsa_pk_t))); |
106 | 2.58k | } |
107 | | |
108 | | void |
109 | | eddsa_pk_free(eddsa_pk_t **pkp) |
110 | 3.48k | { |
111 | 3.48k | eddsa_pk_t *pk; |
112 | | |
113 | 3.48k | if (pkp == NULL || (pk = *pkp) == NULL) |
114 | 3.48k | return; |
115 | | |
116 | 2.57k | freezero(pk, sizeof(*pk)); |
117 | 2.57k | *pkp = NULL; |
118 | 2.57k | } |
119 | | |
120 | | int |
121 | | eddsa_pk_from_ptr(eddsa_pk_t *pk, const void *ptr, size_t len) |
122 | 1.29k | { |
123 | 1.29k | if (len < sizeof(*pk)) |
124 | 1.27k | return (FIDO_ERR_INVALID_ARGUMENT); |
125 | | |
126 | 19 | memcpy(pk, ptr, sizeof(*pk)); |
127 | | |
128 | 19 | return (FIDO_OK); |
129 | 19 | } |
130 | | |
131 | | EVP_PKEY * |
132 | | eddsa_pk_to_EVP_PKEY(const eddsa_pk_t *k) |
133 | 1.38k | { |
134 | 1.38k | EVP_PKEY *pkey = NULL; |
135 | | |
136 | 1.38k | if ((pkey = EVP_PKEY_new_raw_public_key(EVP_PKEY_ED25519, NULL, k->x, |
137 | 1.38k | sizeof(k->x))) == NULL) |
138 | 1.38k | fido_log_debug("%s: EVP_PKEY_new_raw_public_key", __func__); |
139 | | |
140 | 1.38k | return (pkey); |
141 | 1.38k | } |
142 | | |
143 | | int |
144 | | eddsa_pk_from_EVP_PKEY(eddsa_pk_t *pk, const EVP_PKEY *pkey) |
145 | 1.28k | { |
146 | 1.28k | size_t len = 0; |
147 | | |
148 | 1.28k | if (EVP_PKEY_get_raw_public_key(pkey, NULL, &len) != 1 || |
149 | 1.28k | len != sizeof(pk->x)) |
150 | 8 | return (FIDO_ERR_INTERNAL); |
151 | 1.27k | if (EVP_PKEY_get_raw_public_key(pkey, pk->x, &len) != 1 || |
152 | 1.27k | len != sizeof(pk->x)) |
153 | 4 | return (FIDO_ERR_INTERNAL); |
154 | | |
155 | 1.26k | return (FIDO_OK); |
156 | 1.26k | } |
157 | | |
158 | | int |
159 | | eddsa_verify_sig(const fido_blob_t *dgst, EVP_PKEY *pkey, |
160 | | const fido_blob_t *sig) |
161 | 84 | { |
162 | 84 | EVP_MD_CTX *mdctx = NULL; |
163 | 84 | int ok = -1; |
164 | | |
165 | 84 | if (EVP_PKEY_base_id(pkey) != EVP_PKEY_ED25519) { |
166 | 1 | fido_log_debug("%s: EVP_PKEY_base_id", __func__); |
167 | 1 | goto fail; |
168 | 1 | } |
169 | | |
170 | | /* EVP_DigestVerify needs ints */ |
171 | 83 | if (dgst->len > INT_MAX || sig->len > INT_MAX) { |
172 | 0 | fido_log_debug("%s: dgst->len=%zu, sig->len=%zu", __func__, |
173 | 0 | dgst->len, sig->len); |
174 | 0 | return (-1); |
175 | 0 | } |
176 | | |
177 | 83 | if ((mdctx = EVP_MD_CTX_new()) == NULL) { |
178 | 2 | fido_log_debug("%s: EVP_MD_CTX_new", __func__); |
179 | 2 | goto fail; |
180 | 2 | } |
181 | | |
182 | 81 | if (EVP_DigestVerifyInit(mdctx, NULL, NULL, NULL, pkey) != 1) { |
183 | 2 | fido_log_debug("%s: EVP_DigestVerifyInit", __func__); |
184 | 2 | goto fail; |
185 | 2 | } |
186 | | |
187 | 79 | if (EVP_DigestVerify(mdctx, sig->ptr, sig->len, dgst->ptr, |
188 | 79 | dgst->len) != 1) { |
189 | 79 | fido_log_debug("%s: EVP_DigestVerify", __func__); |
190 | 79 | goto fail; |
191 | 79 | } |
192 | | |
193 | 0 | ok = 0; |
194 | 84 | fail: |
195 | 84 | EVP_MD_CTX_free(mdctx); |
196 | | |
197 | 84 | return (ok); |
198 | 0 | } |
199 | | |
200 | | int |
201 | | eddsa_pk_verify_sig(const fido_blob_t *dgst, const eddsa_pk_t *pk, |
202 | | const fido_blob_t *sig) |
203 | 85 | { |
204 | 85 | EVP_PKEY *pkey; |
205 | 85 | int ok = -1; |
206 | | |
207 | 85 | if ((pkey = eddsa_pk_to_EVP_PKEY(pk)) == NULL || |
208 | 85 | eddsa_verify_sig(dgst, pkey, sig) < 0) { |
209 | 85 | fido_log_debug("%s: eddsa_verify_sig", __func__); |
210 | 85 | goto fail; |
211 | 85 | } |
212 | | |
213 | 0 | ok = 0; |
214 | 85 | fail: |
215 | 85 | EVP_PKEY_free(pkey); |
216 | | |
217 | 85 | return (ok); |
218 | 0 | } |