Coverage Report

Created: 2023-09-23 17:42

/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.
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 * SPDX-License-Identifier: BSD-2-Clause
6
 */
7
8
#include "fido.h"
9
#include "fido/config.h"
10
#include "fido/es256.h"
11
12
930
#define CMD_ENABLE_ENTATTEST    0x01
13
925
#define CMD_TOGGLE_ALWAYS_UV    0x02
14
2.18k
#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
1.81k
{
19
1.81k
        uint8_t prefix[32 + 2 * sizeof(uint8_t)], cbor[128];
20
1.81k
        size_t cbor_len = 0;
21
22
1.81k
        memset(prefix, 0xff, sizeof(prefix));
23
1.81k
        prefix[sizeof(prefix) - 2] = CTAP_CBOR_CONFIG;
24
1.81k
        prefix[sizeof(prefix) - 1] = subcmd;
25
26
1.81k
        if (item != NULL) {
27
990
                if ((cbor_len = cbor_serialize(item, cbor, sizeof(cbor))) == 0) {
28
239
                        fido_log_debug("%s: cbor_serialize", __func__);
29
239
                        return -1;
30
239
                }
31
990
        }
32
1.57k
        if ((hmac->ptr = malloc(cbor_len + sizeof(prefix))) == NULL) {
33
17
                fido_log_debug("%s: malloc", __func__);
34
17
                return -1;
35
17
        }
36
1.55k
        memcpy(hmac->ptr, prefix, sizeof(prefix));
37
1.55k
        memcpy(hmac->ptr + sizeof(prefix), cbor, cbor_len);
38
1.55k
        hmac->len = cbor_len + sizeof(prefix);
39
40
1.55k
        return 0;
41
1.57k
}
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
4.04k
{
47
4.04k
        cbor_item_t *argv[4];
48
4.04k
        es256_pk_t *pk = NULL;
49
4.04k
        fido_blob_t *ecdh = NULL, f, hmac;
50
4.04k
        const uint8_t cmd = CTAP_CBOR_CONFIG;
51
4.04k
        int r = FIDO_ERR_INTERNAL;
52
53
4.04k
        memset(&f, 0, sizeof(f));
54
4.04k
        memset(&hmac, 0, sizeof(hmac));
55
4.04k
        memset(&argv, 0, sizeof(argv));
56
57
        /* subCommand */
58
4.04k
        if ((argv[0] = cbor_build_uint8(subcmd)) == NULL) {
59
19
                fido_log_debug("%s: cbor encode", __func__);
60
19
                goto fail;
61
19
        }
62
63
        /* subCommandParams */
64
4.02k
        if (paramc != 0 &&
65
4.02k
            (argv[1] = cbor_flatten_vector(paramv, paramc)) == NULL) {
66
20
                fido_log_debug("%s: cbor_flatten_vector", __func__);
67
20
                goto fail;
68
20
        }
69
70
        /* pinProtocol, pinAuth */
71
4.00k
        if (pin != NULL ||
72
4.00k
            (fido_dev_supports_permissions(dev) && fido_dev_has_uv(dev))) {
73
1.81k
                if (config_prepare_hmac(subcmd, argv[1], &hmac) < 0) {
74
256
                        fido_log_debug("%s: config_prepare_hmac", __func__);
75
256
                        goto fail;
76
256
                }
77
1.55k
                if ((r = fido_do_ecdh(dev, &pk, &ecdh, ms)) != FIDO_OK) {
78
1.31k
                        fido_log_debug("%s: fido_do_ecdh", __func__);
79
1.31k
                        goto fail;
80
1.31k
                }
81
238
                if ((r = cbor_add_uv_params(dev, cmd, &hmac, pk, ecdh, pin,
82
238
                    NULL, &argv[3], &argv[2], ms)) != FIDO_OK) {
83
228
                        fido_log_debug("%s: cbor_add_uv_params", __func__);
84
228
                        goto fail;
85
228
                }
86
238
        }
87
88
        /* framing and transmission */
89
2.20k
        if (cbor_build_frame(cmd, argv, nitems(argv), &f) < 0 ||
90
2.20k
            fido_tx(dev, CTAP_CMD_CBOR, f.ptr, f.len, ms) < 0) {
91
158
                fido_log_debug("%s: fido_tx", __func__);
92
158
                r = FIDO_ERR_TX;
93
158
                goto fail;
94
158
        }
95
96
2.04k
        r = FIDO_OK;
97
4.04k
fail:
98
4.04k
        cbor_vector_free(argv, nitems(argv));
99
4.04k
        es256_pk_free(&pk);
100
4.04k
        fido_blob_free(&ecdh);
101
4.04k
        free(f.ptr);
102
4.04k
        free(hmac.ptr);
103
104
4.04k
        return r;
105
2.04k
}
106
107
static int
108
config_enable_entattest_wait(fido_dev_t *dev, const char *pin, int *ms)
109
930
{
110
930
        int r;
111
112
930
        if ((r = config_tx(dev, CMD_ENABLE_ENTATTEST, NULL, 0, pin,
113
930
            ms)) != FIDO_OK)
114
454
                return r;
115
116
476
        return fido_rx_cbor_status(dev, ms);
117
930
}
118
119
int
120
fido_dev_enable_entattest(fido_dev_t *dev, const char *pin)
121
930
{
122
930
        int ms = dev->timeout_ms;
123
124
930
        return (config_enable_entattest_wait(dev, pin, &ms));
125
930
}
126
127
static int
128
config_toggle_always_uv_wait(fido_dev_t *dev, const char *pin, int *ms)
129
925
{
130
925
        int r;
131
132
925
        if ((r = config_tx(dev, CMD_TOGGLE_ALWAYS_UV, NULL, 0, pin,
133
925
            ms)) != FIDO_OK)
134
423
                return r;
135
136
502
        return (fido_rx_cbor_status(dev, ms));
137
925
}
138
139
int
140
fido_dev_toggle_always_uv(fido_dev_t *dev, const char *pin)
141
925
{
142
925
        int ms = dev->timeout_ms;
143
144
925
        return config_toggle_always_uv_wait(dev, pin, &ms);
145
925
}
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
2.69k
{
151
2.69k
        cbor_item_t *argv[3];
152
2.69k
        int r;
153
154
2.69k
        memset(argv, 0, sizeof(argv));
155
156
2.69k
        if ((rpid == NULL && len == 0 && !force) || len > UINT8_MAX) {
157
371
                r = FIDO_ERR_INVALID_ARGUMENT;
158
371
                goto fail;
159
371
        }
160
2.32k
        if (len && (argv[0] = cbor_build_uint8((uint8_t)len)) == NULL) {
161
1
                fido_log_debug("%s: cbor_encode_uint8", __func__);
162
1
                r = FIDO_ERR_INTERNAL;
163
1
                goto fail;
164
1
        }
165
2.32k
        if (rpid != NULL && (argv[1] = cbor_encode_str_array(rpid)) == NULL) {
166
132
                fido_log_debug("%s: cbor_encode_str_array", __func__);
167
132
                r = FIDO_ERR_INTERNAL;
168
132
                goto fail;
169
132
        }
170
2.19k
        if (force && (argv[2] = cbor_build_bool(true)) == NULL) {
171
4
                fido_log_debug("%s: cbor_build_bool", __func__);
172
4
                r = FIDO_ERR_INTERNAL;
173
4
                goto fail;
174
4
        }
175
2.18k
        if ((r = config_tx(dev, CMD_SET_PIN_MINLEN, argv, nitems(argv),
176
2.18k
            pin, ms)) != FIDO_OK) {
177
1.12k
                fido_log_debug("%s: config_tx", __func__);
178
1.12k
                goto fail;
179
1.12k
        }
180
181
2.69k
fail:
182
2.69k
        cbor_vector_free(argv, nitems(argv));
183
184
2.69k
        return r;
185
2.18k
}
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
2.69k
{
191
2.69k
        int r;
192
193
2.69k
        if ((r = config_pin_minlen_tx(dev, len, force, rpid, pin,
194
2.69k
            ms)) != FIDO_OK)
195
1.63k
                return r;
196
197
1.06k
        return fido_rx_cbor_status(dev, ms);
198
2.69k
}
199
200
int
201
fido_dev_set_pin_minlen(fido_dev_t *dev, size_t len, const char *pin)
202
872
{
203
872
        int ms = dev->timeout_ms;
204
205
872
        return config_pin_minlen(dev, len, false, NULL, pin, &ms);
206
872
}
207
208
int
209
fido_dev_force_pin_change(fido_dev_t *dev, const char *pin)
210
930
{
211
930
        int ms = dev->timeout_ms;
212
213
930
        return config_pin_minlen(dev, 0, true, NULL, pin, &ms);
214
930
}
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
953
{
220
953
        fido_str_array_t sa;
221
953
        int ms = dev->timeout_ms;
222
953
        int r;
223
224
953
        memset(&sa, 0, sizeof(sa));
225
953
        if (fido_str_array_pack(&sa, rpid, n) < 0) {
226
58
                fido_log_debug("%s: fido_str_array_pack", __func__);
227
58
                r = FIDO_ERR_INTERNAL;
228
58
                goto fail;
229
58
        }
230
895
        r = config_pin_minlen(dev, 0, false, &sa, pin, &ms);
231
953
fail:
232
953
        fido_str_array_free(&sa);
233
234
953
        return r;
235
895
}