| 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 | 14.3k | #define CMD_ENABLE_ENTATTEST    0x01 | 
| 13 | 14.2k | #define CMD_TOGGLE_ALWAYS_UV    0x02 | 
| 14 | 32.8k | #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 | 42.5k | { | 
| 19 | 42.5k |         uint8_t prefix[32 + 2 * sizeof(uint8_t)], cbor[128]; | 
| 20 | 42.5k |         size_t cbor_len = 0; | 
| 21 |  |  | 
| 22 | 42.5k |         memset(prefix, 0xff, sizeof(prefix)); | 
| 23 | 42.5k |         prefix[sizeof(prefix) - 2] = CTAP_CBOR_CONFIG; | 
| 24 | 42.5k |         prefix[sizeof(prefix) - 1] = subcmd; | 
| 25 |  |  | 
| 26 | 42.5k |         if (item != NULL) { | 
| 27 | 23.6k |                 if ((cbor_len = cbor_serialize(item, cbor, sizeof(cbor))) == 0) { | 
| 28 | 5.83k |                         fido_log_debug("%s: cbor_serialize", __func__); | 
| 29 | 5.83k |                         return -1; | 
| 30 | 5.83k |                 } | 
| 31 | 23.6k |         } | 
| 32 | 36.6k |         if ((hmac->ptr = malloc(cbor_len + sizeof(prefix))) == NULL) { | 
| 33 | 260 |                 fido_log_debug("%s: malloc", __func__); | 
| 34 | 260 |                 return -1; | 
| 35 | 260 |         } | 
| 36 | 36.4k |         memcpy(hmac->ptr, prefix, sizeof(prefix)); | 
| 37 | 36.4k |         memcpy(hmac->ptr + sizeof(prefix), cbor, cbor_len); | 
| 38 | 36.4k |         hmac->len = cbor_len + sizeof(prefix); | 
| 39 |  |  | 
| 40 | 36.4k |         return 0; | 
| 41 | 36.6k | } | 
| 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 | 61.5k | { | 
| 47 | 61.5k |         cbor_item_t *argv[4]; | 
| 48 | 61.5k |         es256_pk_t *pk = NULL; | 
| 49 | 61.5k |         fido_blob_t *ecdh = NULL, f, hmac; | 
| 50 | 61.5k |         const uint8_t cmd = CTAP_CBOR_CONFIG; | 
| 51 | 61.5k |         int r = FIDO_ERR_INTERNAL; | 
| 52 |  |  | 
| 53 | 61.5k |         memset(&f, 0, sizeof(f)); | 
| 54 | 61.5k |         memset(&hmac, 0, sizeof(hmac)); | 
| 55 | 61.5k |         memset(&argv, 0, sizeof(argv)); | 
| 56 |  |  | 
| 57 |  |         /* subCommand */ | 
| 58 | 61.5k |         if ((argv[0] = cbor_build_uint8(subcmd)) == NULL) { | 
| 59 | 196 |                 fido_log_debug("%s: cbor encode", __func__); | 
| 60 | 196 |                 goto fail; | 
| 61 | 196 |         } | 
| 62 |  |  | 
| 63 |  |         /* subCommandParams */ | 
| 64 | 61.3k |         if (paramc != 0 && | 
| 65 | 61.3k |             (argv[1] = cbor_flatten_vector(paramv, paramc)) == NULL) { | 
| 66 | 114 |                 fido_log_debug("%s: cbor_flatten_vector", __func__); | 
| 67 | 114 |                 goto fail; | 
| 68 | 114 |         } | 
| 69 |  |  | 
| 70 |  |         /* pinProtocol, pinAuth */ | 
| 71 | 61.1k |         if (pin != NULL || | 
| 72 | 61.1k |             (fido_dev_supports_permissions(dev) && fido_dev_has_uv(dev))) { | 
| 73 | 42.5k |                 if (config_prepare_hmac(subcmd, argv[1], &hmac) < 0) { | 
| 74 | 6.09k |                         fido_log_debug("%s: config_prepare_hmac", __func__); | 
| 75 | 6.09k |                         goto fail; | 
| 76 | 6.09k |                 } | 
| 77 | 36.4k |                 if ((r = fido_do_ecdh(dev, &pk, &ecdh, ms)) != FIDO_OK) { | 
| 78 | 34.1k |                         fido_log_debug("%s: fido_do_ecdh", __func__); | 
| 79 | 34.1k |                         goto fail; | 
| 80 | 34.1k |                 } | 
| 81 | 2.22k |                 if ((r = cbor_add_uv_params(dev, cmd, &hmac, pk, ecdh, pin, | 
| 82 | 2.22k |                     NULL, &argv[3], &argv[2], ms)) != FIDO_OK) { | 
| 83 | 2.17k |                         fido_log_debug("%s: cbor_add_uv_params", __func__); | 
| 84 | 2.17k |                         goto fail; | 
| 85 | 2.17k |                 } | 
| 86 | 2.22k |         } | 
| 87 |  |  | 
| 88 |  |         /* framing and transmission */ | 
| 89 | 18.7k |         if (cbor_build_frame(cmd, argv, nitems(argv), &f) < 0 || | 
| 90 | 18.7k |             fido_tx(dev, CTAP_CMD_CBOR, f.ptr, f.len, ms) < 0) { | 
| 91 | 722 |                 fido_log_debug("%s: fido_tx", __func__); | 
| 92 | 722 |                 r = FIDO_ERR_TX; | 
| 93 | 722 |                 goto fail; | 
| 94 | 722 |         } | 
| 95 |  |  | 
| 96 | 18.0k |         r = FIDO_OK; | 
| 97 | 61.5k | fail: | 
| 98 | 61.5k |         cbor_vector_free(argv, nitems(argv)); | 
| 99 | 61.5k |         es256_pk_free(&pk); | 
| 100 | 61.5k |         fido_blob_free(&ecdh); | 
| 101 | 61.5k |         free(f.ptr); | 
| 102 | 61.5k |         free(hmac.ptr); | 
| 103 |  |  | 
| 104 | 61.5k |         return r; | 
| 105 | 18.0k | } | 
| 106 |  |  | 
| 107 |  | static int | 
| 108 |  | config_enable_entattest_wait(fido_dev_t *dev, const char *pin, int *ms) | 
| 109 | 14.3k | { | 
| 110 | 14.3k |         int r; | 
| 111 |  |  | 
| 112 | 14.3k |         if ((r = config_tx(dev, CMD_ENABLE_ENTATTEST, NULL, 0, pin, | 
| 113 | 14.3k |             ms)) != FIDO_OK) | 
| 114 | 9.63k |                 return r; | 
| 115 |  |  | 
| 116 | 4.75k |         return fido_rx_cbor_status(dev, ms); | 
| 117 | 14.3k | } | 
| 118 |  |  | 
| 119 |  | int | 
| 120 |  | fido_dev_enable_entattest(fido_dev_t *dev, const char *pin) | 
| 121 | 14.3k | { | 
| 122 | 14.3k |         int ms = dev->timeout_ms; | 
| 123 |  |  | 
| 124 | 14.3k |         return (config_enable_entattest_wait(dev, pin, &ms)); | 
| 125 | 14.3k | } | 
| 126 |  |  | 
| 127 |  | static int | 
| 128 |  | config_toggle_always_uv_wait(fido_dev_t *dev, const char *pin, int *ms) | 
| 129 | 14.2k | { | 
| 130 | 14.2k |         int r; | 
| 131 |  |  | 
| 132 | 14.2k |         if ((r = config_tx(dev, CMD_TOGGLE_ALWAYS_UV, NULL, 0, pin, | 
| 133 | 14.2k |             ms)) != FIDO_OK) | 
| 134 | 9.49k |                 return r; | 
| 135 |  |  | 
| 136 | 4.76k |         return (fido_rx_cbor_status(dev, ms)); | 
| 137 | 14.2k | } | 
| 138 |  |  | 
| 139 |  | int | 
| 140 |  | fido_dev_toggle_always_uv(fido_dev_t *dev, const char *pin) | 
| 141 | 14.2k | { | 
| 142 | 14.2k |         int ms = dev->timeout_ms; | 
| 143 |  |  | 
| 144 | 14.2k |         return config_toggle_always_uv_wait(dev, pin, &ms); | 
| 145 | 14.2k | } | 
| 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 | 41.8k | { | 
| 151 | 41.8k |         cbor_item_t *argv[3]; | 
| 152 | 41.8k |         int r; | 
| 153 |  |  | 
| 154 | 41.8k |         memset(argv, 0, sizeof(argv)); | 
| 155 |  |  | 
| 156 | 41.8k |         if ((rpid == NULL && len == 0 && !force) || len > UINT8_MAX) { | 
| 157 | 6.61k |                 r = FIDO_ERR_INVALID_ARGUMENT; | 
| 158 | 6.61k |                 goto fail; | 
| 159 | 6.61k |         } | 
| 160 | 35.2k |         if (len && (argv[0] = cbor_build_uint8((uint8_t)len)) == NULL) { | 
| 161 | 7 |                 fido_log_debug("%s: cbor_encode_uint8", __func__); | 
| 162 | 7 |                 r = FIDO_ERR_INTERNAL; | 
| 163 | 7 |                 goto fail; | 
| 164 | 7 |         } | 
| 165 | 35.2k |         if (rpid != NULL && (argv[1] = cbor_encode_str_array(rpid)) == NULL) { | 
| 166 | 2.34k |                 fido_log_debug("%s: cbor_encode_str_array", __func__); | 
| 167 | 2.34k |                 r = FIDO_ERR_INTERNAL; | 
| 168 | 2.34k |                 goto fail; | 
| 169 | 2.34k |         } | 
| 170 | 32.8k |         if (force && (argv[2] = cbor_build_bool(true)) == NULL) { | 
| 171 | 17 |                 fido_log_debug("%s: cbor_build_bool", __func__); | 
| 172 | 17 |                 r = FIDO_ERR_INTERNAL; | 
| 173 | 17 |                 goto fail; | 
| 174 | 17 |         } | 
| 175 | 32.8k |         if ((r = config_tx(dev, CMD_SET_PIN_MINLEN, argv, nitems(argv), | 
| 176 | 32.8k |             pin, ms)) != FIDO_OK) { | 
| 177 | 24.3k |                 fido_log_debug("%s: config_tx", __func__); | 
| 178 | 24.3k |                 goto fail; | 
| 179 | 24.3k |         } | 
| 180 |  |  | 
| 181 | 41.8k | fail: | 
| 182 | 41.8k |         cbor_vector_free(argv, nitems(argv)); | 
| 183 |  |  | 
| 184 | 41.8k |         return r; | 
| 185 | 32.8k | } | 
| 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 | 41.8k | { | 
| 191 | 41.8k |         int r; | 
| 192 |  |  | 
| 193 | 41.8k |         if ((r = config_pin_minlen_tx(dev, len, force, rpid, pin, | 
| 194 | 41.8k |             ms)) != FIDO_OK) | 
| 195 | 33.3k |                 return r; | 
| 196 |  |  | 
| 197 | 8.48k |         return fido_rx_cbor_status(dev, ms); | 
| 198 | 41.8k | } | 
| 199 |  |  | 
| 200 |  | int | 
| 201 |  | fido_dev_set_pin_minlen(fido_dev_t *dev, size_t len, const char *pin) | 
| 202 | 14.0k | { | 
| 203 | 14.0k |         int ms = dev->timeout_ms; | 
| 204 |  |  | 
| 205 | 14.0k |         return config_pin_minlen(dev, len, false, NULL, pin, &ms); | 
| 206 | 14.0k | } | 
| 207 |  |  | 
| 208 |  | int | 
| 209 |  | fido_dev_force_pin_change(fido_dev_t *dev, const char *pin) | 
| 210 | 14.4k | { | 
| 211 | 14.4k |         int ms = dev->timeout_ms; | 
| 212 |  |  | 
| 213 | 14.4k |         return config_pin_minlen(dev, 0, true, NULL, pin, &ms); | 
| 214 | 14.4k | } | 
| 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 | 14.4k | { | 
| 220 | 14.4k |         fido_str_array_t sa; | 
| 221 | 14.4k |         int ms = dev->timeout_ms; | 
| 222 | 14.4k |         int r; | 
| 223 |  |  | 
| 224 | 14.4k |         memset(&sa, 0, sizeof(sa)); | 
| 225 | 14.4k |         if (fido_str_array_pack(&sa, rpid, n) < 0) { | 
| 226 | 1.09k |                 fido_log_debug("%s: fido_str_array_pack", __func__); | 
| 227 | 1.09k |                 r = FIDO_ERR_INTERNAL; | 
| 228 | 1.09k |                 goto fail; | 
| 229 | 1.09k |         } | 
| 230 | 13.3k |         r = config_pin_minlen(dev, 0, false, &sa, pin, &ms); | 
| 231 | 14.4k | fail: | 
| 232 | 14.4k |         fido_str_array_free(&sa); | 
| 233 |  |  | 
| 234 | 14.4k |         return r; | 
| 235 | 13.3k | } |