diff options
Diffstat (limited to 'src/config.c')
| -rw-r--r-- | src/config.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/src/config.c b/src/config.c new file mode 100644 index 000000000000..0dda16163bc8 --- /dev/null +++ b/src/config.c @@ -0,0 +1,191 @@ +/* + * Copyright (c) 2020 Yubico AB. All rights reserved. + * Use of this source code is governed by a BSD-style + * license that can be found in the LICENSE file. + */ + +#include "fido.h" +#include "fido/config.h" +#include "fido/es256.h" + +#define CMD_ENABLE_ENTATTEST 0x01 +#define CMD_TOGGLE_ALWAYS_UV 0x02 +#define CMD_SET_PIN_MINLEN 0x03 + +static int +config_prepare_hmac(uint8_t subcmd, const cbor_item_t *item, fido_blob_t *hmac) +{ + uint8_t prefix[32 + 2 * sizeof(uint8_t)], cbor[128]; + size_t cbor_len; + + memset(prefix, 0xff, sizeof(prefix)); + prefix[sizeof(prefix) - 2] = CTAP_CBOR_CONFIG; + prefix[sizeof(prefix) - 1] = subcmd; + + if ((cbor_len = cbor_serialize(item, cbor, sizeof(cbor))) == 0) { + fido_log_debug("%s: cbor_serialize", __func__); + return -1; + } + if ((hmac->ptr = malloc(cbor_len + sizeof(prefix))) == NULL) { + fido_log_debug("%s: malloc", __func__); + return -1; + } + memcpy(hmac->ptr, prefix, sizeof(prefix)); + memcpy(hmac->ptr + sizeof(prefix), cbor, cbor_len); + hmac->len = cbor_len + sizeof(prefix); + + return 0; +} + +static int +config_tx(fido_dev_t *dev, uint8_t subcmd, cbor_item_t **paramv, size_t paramc, + const char *pin) +{ + cbor_item_t *argv[4]; + es256_pk_t *pk = NULL; + fido_blob_t *ecdh = NULL, f, hmac; + const uint8_t cmd = CTAP_CBOR_CONFIG; + int r = FIDO_ERR_INTERNAL; + + memset(&f, 0, sizeof(f)); + memset(&hmac, 0, sizeof(hmac)); + memset(&argv, 0, sizeof(argv)); + + /* subCommand */ + if ((argv[0] = cbor_build_uint8(subcmd)) == NULL) { + fido_log_debug("%s: cbor encode", __func__); + goto fail; + } + + /* pinProtocol, pinAuth */ + if (pin != NULL || (fido_dev_supports_permissions(dev) && + fido_dev_has_uv(dev))) { + if ((argv[1] = cbor_flatten_vector(paramv, paramc)) == NULL) { + fido_log_debug("%s: cbor_flatten_vector", __func__); + goto fail; + } + if (config_prepare_hmac(subcmd, argv[1], &hmac) < 0) { + fido_log_debug("%s: config_prepare_hmac", __func__); + goto fail; + } + if ((r = fido_do_ecdh(dev, &pk, &ecdh)) != FIDO_OK) { + fido_log_debug("%s: fido_do_ecdh", __func__); + goto fail; + } + if ((r = cbor_add_uv_params(dev, cmd, &hmac, pk, ecdh, pin, + NULL, &argv[3], &argv[2])) != FIDO_OK) { + fido_log_debug("%s: cbor_add_uv_params", __func__); + goto fail; + } + } + + /* framing and transmission */ + if (cbor_build_frame(cmd, argv, nitems(argv), &f) < 0 || + fido_tx(dev, CTAP_CMD_CBOR, f.ptr, f.len) < 0) { + fido_log_debug("%s: fido_tx", __func__); + r = FIDO_ERR_TX; + goto fail; + } + + r = FIDO_OK; +fail: + cbor_vector_free(argv, nitems(argv)); + es256_pk_free(&pk); + fido_blob_free(&ecdh); + free(f.ptr); + free(hmac.ptr); + + return r; +} + +static int +config_enable_entattest_wait(fido_dev_t *dev, const char *pin, int ms) +{ + int r; + + if ((r = config_tx(dev, CMD_ENABLE_ENTATTEST, NULL, 0, pin)) != FIDO_OK) + return r; + + return fido_rx_cbor_status(dev, ms); +} + +int +fido_dev_enable_entattest(fido_dev_t *dev, const char *pin) +{ + return (config_enable_entattest_wait(dev, pin, -1)); +} + +static int +config_toggle_always_uv_wait(fido_dev_t *dev, const char *pin, int ms) +{ + int r; + + if ((r = config_tx(dev, CMD_TOGGLE_ALWAYS_UV, NULL, 0, pin)) != FIDO_OK) + return r; + + return (fido_rx_cbor_status(dev, ms)); +} + +int +fido_dev_toggle_always_uv(fido_dev_t *dev, const char *pin) +{ + return config_toggle_always_uv_wait(dev, pin, -1); +} + +static int +config_pin_minlen_tx(fido_dev_t *dev, size_t len, bool force, const char *pin) +{ + cbor_item_t *argv[3]; + int r; + + memset(argv, 0, sizeof(argv)); + + if ((!len && !force) || len > UINT8_MAX) { + r = FIDO_ERR_INVALID_ARGUMENT; + goto fail; + } + if (len && (argv[0] = cbor_build_uint8((uint8_t)len)) == NULL) { + fido_log_debug("%s: cbor_encode_uint8", __func__); + r = FIDO_ERR_INTERNAL; + goto fail; + } + if (force && (argv[2] = cbor_build_bool(true)) == NULL) { + fido_log_debug("%s: cbor_build_bool", __func__); + r = FIDO_ERR_INTERNAL; + goto fail; + } + if ((r = config_tx(dev, CMD_SET_PIN_MINLEN, argv, nitems(argv), + pin)) != FIDO_OK) { + fido_log_debug("%s: config_tx", __func__); + goto fail; + } + +fail: + cbor_vector_free(argv, nitems(argv)); + + return r; +} + +static int +config_pin_minlen(fido_dev_t *dev, size_t len, bool force, const char *pin, + int ms) +{ + int r; + + if ((r = config_pin_minlen_tx(dev, len, force, pin)) != FIDO_OK) + return r; + + return fido_rx_cbor_status(dev, ms); +} + +int +fido_dev_set_pin_minlen(fido_dev_t *dev, size_t len, const char *pin) +{ + return config_pin_minlen(dev, len, false, pin, -1); +} + +int +fido_dev_force_pin_change(fido_dev_t *dev, const char *pin) +{ + return config_pin_minlen(dev, 0, true, pin, -1); +} |