1 /*
2 * Copyright (c) 2018 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 */
6
7 #include "fido.h"
8
9 static int
get_key_len(uint8_t tag,uint8_t * key,size_t * key_len)10 get_key_len(uint8_t tag, uint8_t *key, size_t *key_len)
11 {
12 *key = tag & 0xfc;
13 if ((*key & 0xf0) == 0xf0) {
14 fido_log_debug("%s: *key=0x%02x", __func__, *key);
15 return (-1);
16 }
17
18 *key_len = tag & 0x3;
19 if (*key_len == 3) {
20 *key_len = 4;
21 }
22
23 return (0);
24 }
25
26 static int
get_key_val(const void * body,size_t key_len,uint32_t * val)27 get_key_val(const void *body, size_t key_len, uint32_t *val)
28 {
29 const uint8_t *ptr = body;
30
31 switch (key_len) {
32 case 0:
33 *val = 0;
34 break;
35 case 1:
36 *val = ptr[0];
37 break;
38 case 2:
39 *val = (uint32_t)((ptr[1] << 8) | ptr[0]);
40 break;
41 default:
42 fido_log_debug("%s: key_len=%zu", __func__, key_len);
43 return (-1);
44 }
45
46 return (0);
47 }
48
49 int
fido_hid_get_usage(const uint8_t * report_ptr,size_t report_len,uint32_t * usage_page)50 fido_hid_get_usage(const uint8_t *report_ptr, size_t report_len,
51 uint32_t *usage_page)
52 {
53 const uint8_t *ptr = report_ptr;
54 size_t len = report_len;
55
56 while (len > 0) {
57 const uint8_t tag = ptr[0];
58 ptr++;
59 len--;
60
61 uint8_t key;
62 size_t key_len;
63 uint32_t key_val;
64
65 if (get_key_len(tag, &key, &key_len) < 0 || key_len > len ||
66 get_key_val(ptr, key_len, &key_val) < 0) {
67 return (-1);
68 }
69
70 if (key == 0x4) {
71 *usage_page = key_val;
72 }
73
74 ptr += key_len;
75 len -= key_len;
76 }
77
78 return (0);
79 }
80
81 int
fido_hid_get_report_len(const uint8_t * report_ptr,size_t report_len,size_t * report_in_len,size_t * report_out_len)82 fido_hid_get_report_len(const uint8_t *report_ptr, size_t report_len,
83 size_t *report_in_len, size_t *report_out_len)
84 {
85 const uint8_t *ptr = report_ptr;
86 size_t len = report_len;
87 uint32_t report_size = 0;
88
89 while (len > 0) {
90 const uint8_t tag = ptr[0];
91 ptr++;
92 len--;
93
94 uint8_t key;
95 size_t key_len;
96 uint32_t key_val;
97
98 if (get_key_len(tag, &key, &key_len) < 0 || key_len > len ||
99 get_key_val(ptr, key_len, &key_val) < 0) {
100 return (-1);
101 }
102
103 if (key == 0x94) {
104 report_size = key_val;
105 } else if (key == 0x80) {
106 *report_in_len = (size_t)report_size;
107 } else if (key == 0x90) {
108 *report_out_len = (size_t)report_size;
109 }
110
111 ptr += key_len;
112 len -= key_len;
113 }
114
115 return (0);
116 }
117
118 fido_dev_info_t *
fido_dev_info_new(size_t n)119 fido_dev_info_new(size_t n)
120 {
121 return (calloc(n, sizeof(fido_dev_info_t)));
122 }
123
124 void
fido_dev_info_free(fido_dev_info_t ** devlist_p,size_t n)125 fido_dev_info_free(fido_dev_info_t **devlist_p, size_t n)
126 {
127 fido_dev_info_t *devlist;
128
129 if (devlist_p == NULL || (devlist = *devlist_p) == NULL)
130 return;
131
132 for (size_t i = 0; i < n; i++) {
133 const fido_dev_info_t *di;
134 di = &devlist[i];
135 free(di->path);
136 free(di->manufacturer);
137 free(di->product);
138 }
139
140 free(devlist);
141
142 *devlist_p = NULL;
143 }
144
145 const fido_dev_info_t *
fido_dev_info_ptr(const fido_dev_info_t * devlist,size_t i)146 fido_dev_info_ptr(const fido_dev_info_t *devlist, size_t i)
147 {
148 return (&devlist[i]);
149 }
150
151 const char *
fido_dev_info_path(const fido_dev_info_t * di)152 fido_dev_info_path(const fido_dev_info_t *di)
153 {
154 return (di->path);
155 }
156
157 int16_t
fido_dev_info_vendor(const fido_dev_info_t * di)158 fido_dev_info_vendor(const fido_dev_info_t *di)
159 {
160 return (di->vendor_id);
161 }
162
163 int16_t
fido_dev_info_product(const fido_dev_info_t * di)164 fido_dev_info_product(const fido_dev_info_t *di)
165 {
166 return (di->product_id);
167 }
168
169 const char *
fido_dev_info_manufacturer_string(const fido_dev_info_t * di)170 fido_dev_info_manufacturer_string(const fido_dev_info_t *di)
171 {
172 return (di->manufacturer);
173 }
174
175 const char *
fido_dev_info_product_string(const fido_dev_info_t * di)176 fido_dev_info_product_string(const fido_dev_info_t *di)
177 {
178 return (di->product);
179 }
180