Coverage Report

Created: 2021-03-26 11:35

/libfido2/src/hid.c
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Source (jump to first uncovered line)
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/*
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 * Copyright (c) 2018 Yubico AB. All rights reserved.
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 * Use of this source code is governed by a BSD-style
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 * license that can be found in the LICENSE file.
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 */
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#include "fido.h"
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static int
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get_key_len(uint8_t tag, uint8_t *key, size_t *key_len)
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{
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        *key = tag & 0xfc;
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        if ((*key & 0xf0) == 0xf0) {
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                fido_log_debug("%s: *key=0x%02x", __func__, *key);
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                return (-1);
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        }
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        *key_len = tag & 0x3;
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        if (*key_len == 3) {
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                *key_len = 4;
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        }
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        return (0);
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}
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static int
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get_key_val(const void *body, size_t key_len, uint32_t *val)
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{
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        const uint8_t *ptr = body;
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        switch (key_len) {
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        case 0:
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                *val = 0;
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                break;
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        case 1:
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                *val = ptr[0];
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                break;
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        case 2:
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                *val = (uint32_t)((ptr[1] << 8) | ptr[0]);
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                break;
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        default:
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                fido_log_debug("%s: key_len=%zu", __func__, key_len);
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                return (-1);
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        }
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        return (0);
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}
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int
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fido_hid_get_usage(const uint8_t *report_ptr, size_t report_len,
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    uint32_t *usage_page)
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{
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        const uint8_t   *ptr = report_ptr;
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        size_t           len = report_len;
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        while (len > 0) {
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                const uint8_t tag = ptr[0];
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                ptr++;
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                len--;
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                uint8_t  key;
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                size_t   key_len;
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                uint32_t key_val;
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                if (get_key_len(tag, &key, &key_len) < 0 || key_len > len ||
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                    get_key_val(ptr, key_len, &key_val) < 0) {
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                        return (-1);
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                }
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                if (key == 0x4) {
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                        *usage_page = key_val;
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                }
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                ptr += key_len;
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                len -= key_len;
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        }
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        return (0);
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}
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int
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fido_hid_get_report_len(const uint8_t *report_ptr, size_t report_len,
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    size_t *report_in_len, size_t *report_out_len)
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{
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        const uint8_t   *ptr = report_ptr;
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        size_t           len = report_len;
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        uint32_t         report_size = 0;
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        while (len > 0) {
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                const uint8_t tag = ptr[0];
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                ptr++;
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                len--;
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                uint8_t  key;
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                size_t   key_len;
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                uint32_t key_val;
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                if (get_key_len(tag, &key, &key_len) < 0 || key_len > len ||
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                    get_key_val(ptr, key_len, &key_val) < 0) {
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                        return (-1);
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                }
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                if (key == 0x94) {
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                        report_size = key_val;
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                } else if (key == 0x80) {
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                        *report_in_len = (size_t)report_size;
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                } else if (key == 0x90) {
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                        *report_out_len = (size_t)report_size;
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                }
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                ptr += key_len;
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                len -= key_len;
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        }
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        return (0);
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}
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fido_dev_info_t *
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fido_dev_info_new(size_t n)
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{
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        return (calloc(n, sizeof(fido_dev_info_t)));
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}
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void
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fido_dev_info_free(fido_dev_info_t **devlist_p, size_t n)
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{
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        fido_dev_info_t *devlist;
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0
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        if (devlist_p == NULL || (devlist = *devlist_p) == NULL)
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                return;
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        for (size_t i = 0; i < n; i++) {
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                const fido_dev_info_t *di = &devlist[i];
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                free(di->path);
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                free(di->manufacturer);
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                free(di->product);
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        }
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        free(devlist);
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        *devlist_p = NULL;
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}
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const fido_dev_info_t *
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fido_dev_info_ptr(const fido_dev_info_t *devlist, size_t i)
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{
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        return (&devlist[i]);
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}
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const char *
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fido_dev_info_path(const fido_dev_info_t *di)
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{
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        return (di->path);
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}
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int16_t
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fido_dev_info_vendor(const fido_dev_info_t *di)
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{
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        return (di->vendor_id);
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}
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int16_t
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fido_dev_info_product(const fido_dev_info_t *di)
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{
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        return (di->product_id);
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}
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const char *
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fido_dev_info_manufacturer_string(const fido_dev_info_t *di)
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{
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        return (di->manufacturer);
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}
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const char *
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fido_dev_info_product_string(const fido_dev_info_t *di)
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{
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        return (di->product);
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}