Coverage Report

Created: 2024-06-03 09:43

/libfido2/src/config.c
Line
Count
Source
1
/*
2
 * Copyright (c) 2020-2022 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
 * SPDX-License-Identifier: BSD-2-Clause
6
 */
7
8
#include "fido.h"
9
#include "fido/config.h"
10
#include "fido/es256.h"
11
12
1.81k
#define CMD_ENABLE_ENTATTEST    0x01
13
1.82k
#define CMD_TOGGLE_ALWAYS_UV    0x02
14
4.63k
#define CMD_SET_PIN_MINLEN      0x03
15
16
static int
17
config_prepare_hmac(uint8_t subcmd, const cbor_item_t *item, fido_blob_t *hmac)
18
5.58k
{
19
5.58k
        uint8_t prefix[32 + 2 * sizeof(uint8_t)], cbor[128];
20
5.58k
        size_t cbor_len = 0;
21
22
5.58k
        memset(prefix, 0xff, sizeof(prefix));
23
5.58k
        prefix[sizeof(prefix) - 2] = CTAP_CBOR_CONFIG;
24
5.58k
        prefix[sizeof(prefix) - 1] = subcmd;
25
26
5.58k
        if (item != NULL) {
27
3.15k
                if ((cbor_len = cbor_serialize(item, cbor, sizeof(cbor))) == 0) {
28
621
                        fido_log_debug("%s: cbor_serialize", __func__);
29
621
                        return -1;
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621
                }
31
3.15k
        }
32
4.96k
        if ((hmac->ptr = malloc(cbor_len + sizeof(prefix))) == NULL) {
33
21
                fido_log_debug("%s: malloc", __func__);
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21
                return -1;
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21
        }
36
4.94k
        memcpy(hmac->ptr, prefix, sizeof(prefix));
37
4.94k
        memcpy(hmac->ptr + sizeof(prefix), cbor, cbor_len);
38
4.94k
        hmac->len = cbor_len + sizeof(prefix);
39
40
4.94k
        return 0;
41
4.96k
}
42
43
static int
44
config_tx(fido_dev_t *dev, uint8_t subcmd, cbor_item_t **paramv, size_t paramc,
45
    const char *pin, int *ms)
46
8.26k
{
47
8.26k
        cbor_item_t *argv[4];
48
8.26k
        es256_pk_t *pk = NULL;
49
8.26k
        fido_blob_t *ecdh = NULL, f, hmac;
50
8.26k
        const uint8_t cmd = CTAP_CBOR_CONFIG;
51
8.26k
        int r = FIDO_ERR_INTERNAL;
52
53
8.26k
        memset(&f, 0, sizeof(f));
54
8.26k
        memset(&hmac, 0, sizeof(hmac));
55
8.26k
        memset(&argv, 0, sizeof(argv));
56
57
        /* subCommand */
58
8.26k
        if ((argv[0] = cbor_build_uint8(subcmd)) == NULL) {
59
28
                fido_log_debug("%s: cbor encode", __func__);
60
28
                goto fail;
61
28
        }
62
63
        /* subCommandParams */
64
8.24k
        if (paramc != 0 &&
65
8.24k
            (argv[1] = cbor_flatten_vector(paramv, paramc)) == NULL) {
66
36
                fido_log_debug("%s: cbor_flatten_vector", __func__);
67
36
                goto fail;
68
36
        }
69
70
        /* pinProtocol, pinAuth */
71
8.20k
        if (pin != NULL ||
72
8.20k
            (fido_dev_supports_permissions(dev) && fido_dev_has_uv(dev))) {
73
5.58k
                if (config_prepare_hmac(subcmd, argv[1], &hmac) < 0) {
74
642
                        fido_log_debug("%s: config_prepare_hmac", __func__);
75
642
                        goto fail;
76
642
                }
77
4.94k
                if ((r = fido_do_ecdh(dev, &pk, &ecdh, ms)) != FIDO_OK) {
78
4.47k
                        fido_log_debug("%s: fido_do_ecdh", __func__);
79
4.47k
                        goto fail;
80
4.47k
                }
81
471
                if ((r = cbor_add_uv_params(dev, cmd, &hmac, pk, ecdh, pin,
82
471
                    NULL, &argv[3], &argv[2], ms)) != FIDO_OK) {
83
454
                        fido_log_debug("%s: cbor_add_uv_params", __func__);
84
454
                        goto fail;
85
454
                }
86
471
        }
87
88
        /* framing and transmission */
89
2.63k
        if (cbor_build_frame(cmd, argv, nitems(argv), &f) < 0 ||
90
2.63k
            fido_tx(dev, CTAP_CMD_CBOR, f.ptr, f.len, ms) < 0) {
91
193
                fido_log_debug("%s: fido_tx", __func__);
92
193
                r = FIDO_ERR_TX;
93
193
                goto fail;
94
193
        }
95
96
2.44k
        r = FIDO_OK;
97
8.26k
fail:
98
8.26k
        cbor_vector_free(argv, nitems(argv));
99
8.26k
        es256_pk_free(&pk);
100
8.26k
        fido_blob_free(&ecdh);
101
8.26k
        free(f.ptr);
102
8.26k
        free(hmac.ptr);
103
104
8.26k
        return r;
105
2.44k
}
106
107
static int
108
config_enable_entattest_wait(fido_dev_t *dev, const char *pin, int *ms)
109
1.81k
{
110
1.81k
        int r;
111
112
1.81k
        if ((r = config_tx(dev, CMD_ENABLE_ENTATTEST, NULL, 0, pin,
113
1.81k
            ms)) != FIDO_OK)
114
1.25k
                return r;
115
116
562
        return fido_rx_cbor_status(dev, ms);
117
1.81k
}
118
119
int
120
fido_dev_enable_entattest(fido_dev_t *dev, const char *pin)
121
1.81k
{
122
1.81k
        int ms = dev->timeout_ms;
123
124
1.81k
        return (config_enable_entattest_wait(dev, pin, &ms));
125
1.81k
}
126
127
static int
128
config_toggle_always_uv_wait(fido_dev_t *dev, const char *pin, int *ms)
129
1.82k
{
130
1.82k
        int r;
131
132
1.82k
        if ((r = config_tx(dev, CMD_TOGGLE_ALWAYS_UV, NULL, 0, pin,
133
1.82k
            ms)) != FIDO_OK)
134
1.23k
                return r;
135
136
589
        return (fido_rx_cbor_status(dev, ms));
137
1.82k
}
138
139
int
140
fido_dev_toggle_always_uv(fido_dev_t *dev, const char *pin)
141
1.82k
{
142
1.82k
        int ms = dev->timeout_ms;
143
144
1.82k
        return config_toggle_always_uv_wait(dev, pin, &ms);
145
1.82k
}
146
147
static int
148
config_pin_minlen_tx(fido_dev_t *dev, size_t len, bool force,
149
    const fido_str_array_t *rpid, const char *pin, int *ms)
150
5.31k
{
151
5.31k
        cbor_item_t *argv[3];
152
5.31k
        int r;
153
154
5.31k
        memset(argv, 0, sizeof(argv));
155
156
5.31k
        if ((rpid == NULL && len == 0 && !force) || len > UINT8_MAX) {
157
432
                r = FIDO_ERR_INVALID_ARGUMENT;
158
432
                goto fail;
159
432
        }
160
4.88k
        if (len && (argv[0] = cbor_build_uint8((uint8_t)len)) == NULL) {
161
3
                fido_log_debug("%s: cbor_encode_uint8", __func__);
162
3
                r = FIDO_ERR_INTERNAL;
163
3
                goto fail;
164
3
        }
165
4.88k
        if (rpid != NULL && (argv[1] = cbor_encode_str_array(rpid)) == NULL) {
166
246
                fido_log_debug("%s: cbor_encode_str_array", __func__);
167
246
                r = FIDO_ERR_INTERNAL;
168
246
                goto fail;
169
246
        }
170
4.63k
        if (force && (argv[2] = cbor_build_bool(true)) == NULL) {
171
7
                fido_log_debug("%s: cbor_build_bool", __func__);
172
7
                r = FIDO_ERR_INTERNAL;
173
7
                goto fail;
174
7
        }
175
4.63k
        if ((r = config_tx(dev, CMD_SET_PIN_MINLEN, argv, nitems(argv),
176
4.63k
            pin, ms)) != FIDO_OK) {
177
3.33k
                fido_log_debug("%s: config_tx", __func__);
178
3.33k
                goto fail;
179
3.33k
        }
180
181
5.31k
fail:
182
5.31k
        cbor_vector_free(argv, nitems(argv));
183
184
5.31k
        return r;
185
4.63k
}
186
187
static int
188
config_pin_minlen(fido_dev_t *dev, size_t len, bool force,
189
    const fido_str_array_t *rpid, const char *pin, int *ms)
190
5.31k
{
191
5.31k
        int r;
192
193
5.31k
        if ((r = config_pin_minlen_tx(dev, len, force, rpid, pin,
194
5.31k
            ms)) != FIDO_OK)
195
4.02k
                return r;
196
197
1.29k
        return fido_rx_cbor_status(dev, ms);
198
5.31k
}
199
200
int
201
fido_dev_set_pin_minlen(fido_dev_t *dev, size_t len, const char *pin)
202
1.76k
{
203
1.76k
        int ms = dev->timeout_ms;
204
205
1.76k
        return config_pin_minlen(dev, len, false, NULL, pin, &ms);
206
1.76k
}
207
208
int
209
fido_dev_force_pin_change(fido_dev_t *dev, const char *pin)
210
1.82k
{
211
1.82k
        int ms = dev->timeout_ms;
212
213
1.82k
        return config_pin_minlen(dev, 0, true, NULL, pin, &ms);
214
1.82k
}
215
216
int
217
fido_dev_set_pin_minlen_rpid(fido_dev_t *dev, const char * const *rpid,
218
    size_t n, const char *pin)
219
1.83k
{
220
1.83k
        fido_str_array_t sa;
221
1.83k
        int ms = dev->timeout_ms;
222
1.83k
        int r;
223
224
1.83k
        memset(&sa, 0, sizeof(sa));
225
1.83k
        if (fido_str_array_pack(&sa, rpid, n) < 0) {
226
104
                fido_log_debug("%s: fido_str_array_pack", __func__);
227
104
                r = FIDO_ERR_INTERNAL;
228
104
                goto fail;
229
104
        }
230
1.73k
        r = config_pin_minlen(dev, 0, false, &sa, pin, &ms);
231
1.83k
fail:
232
1.83k
        fido_str_array_free(&sa);
233
234
1.83k
        return r;
235
1.73k
}