Line | Count | Source (jump to first uncovered line) |
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 <stdint.h> |
8 | | #include <stdio.h> |
9 | | #include <string.h> |
10 | | |
11 | | #include "fido.h" |
12 | | #include "packed.h" |
13 | | |
14 | | PACKED_TYPE(frame_t, |
15 | | struct frame { |
16 | | uint32_t cid; /* channel id */ |
17 | | union { |
18 | | uint8_t type; |
19 | | struct { |
20 | | uint8_t cmd; |
21 | | uint8_t bcnth; |
22 | | uint8_t bcntl; |
23 | | uint8_t data[CTAP_MAX_REPORT_LEN - CTAP_INIT_HEADER_LEN]; |
24 | | } init; |
25 | | struct { |
26 | | uint8_t seq; |
27 | | uint8_t data[CTAP_MAX_REPORT_LEN - CTAP_CONT_HEADER_LEN]; |
28 | | } cont; |
29 | | } body; |
30 | | }) |
31 | | |
32 | | #ifndef MIN |
33 | 111k | #define MIN(x, y) ((x) > (y) ? (y) : (x)) |
34 | | #endif |
35 | | |
36 | | static int |
37 | | tx_empty(fido_dev_t *d, uint8_t cmd) |
38 | 2.61k | { |
39 | 2.61k | struct frame *fp; |
40 | 2.61k | unsigned char pkt[sizeof(*fp) + 1]; |
41 | 2.61k | const size_t len = d->tx_len + 1; |
42 | 2.61k | int n; |
43 | 2.61k | |
44 | 2.61k | memset(&pkt, 0, sizeof(pkt)); |
45 | 2.61k | fp = (struct frame *)(pkt + 1); |
46 | 2.61k | fp->cid = d->cid; |
47 | 2.61k | fp->body.init.cmd = CTAP_FRAME_INIT | cmd; |
48 | 2.61k | |
49 | 2.61k | if (len > sizeof(pkt) || (n = d->io.write(d->io_handle, pkt, |
50 | 2.61k | len)) < 0 || (size_t)n != len) |
51 | 17 | return (-1); |
52 | 2.59k | |
53 | 2.59k | return (0); |
54 | 2.59k | } |
55 | | |
56 | | static size_t |
57 | | tx_preamble(fido_dev_t *d, uint8_t cmd, const void *buf, size_t count) |
58 | 49.7k | { |
59 | 49.7k | struct frame *fp; |
60 | 49.7k | unsigned char pkt[sizeof(*fp) + 1]; |
61 | 49.7k | const size_t len = d->tx_len + 1; |
62 | 49.7k | int n; |
63 | 49.7k | |
64 | 49.7k | if (d->tx_len - CTAP_INIT_HEADER_LEN > sizeof(fp->body.init.data)) |
65 | 0 | return (0); |
66 | 49.7k | |
67 | 49.7k | memset(&pkt, 0, sizeof(pkt)); |
68 | 49.7k | fp = (struct frame *)(pkt + 1); |
69 | 49.7k | fp->cid = d->cid; |
70 | 49.7k | fp->body.init.cmd = CTAP_FRAME_INIT | cmd; |
71 | 49.7k | fp->body.init.bcnth = (count >> 8) & 0xff; |
72 | 49.7k | fp->body.init.bcntl = count & 0xff; |
73 | 49.7k | count = MIN(count, d->tx_len - CTAP_INIT_HEADER_LEN); |
74 | 49.7k | memcpy(&fp->body.init.data, buf, count); |
75 | 49.7k | |
76 | 49.7k | if (len > sizeof(pkt) || (n = d->io.write(d->io_handle, pkt, |
77 | 49.7k | len)) < 0 || (size_t)n != len) |
78 | 142 | return (0); |
79 | 49.6k | |
80 | 49.6k | return (count); |
81 | 49.6k | } |
82 | | |
83 | | static size_t |
84 | | tx_frame(fido_dev_t *d, uint8_t seq, const void *buf, size_t count) |
85 | 62.0k | { |
86 | 62.0k | struct frame *fp; |
87 | 62.0k | unsigned char pkt[sizeof(*fp) + 1]; |
88 | 62.0k | const size_t len = d->tx_len + 1; |
89 | 62.0k | int n; |
90 | 62.0k | |
91 | 62.0k | if (d->tx_len - CTAP_CONT_HEADER_LEN > sizeof(fp->body.cont.data)) |
92 | 0 | return (0); |
93 | 62.0k | |
94 | 62.0k | memset(&pkt, 0, sizeof(pkt)); |
95 | 62.0k | fp = (struct frame *)(pkt + 1); |
96 | 62.0k | fp->cid = d->cid; |
97 | 62.0k | fp->body.cont.seq = seq; |
98 | 62.0k | count = MIN(count, d->tx_len - CTAP_CONT_HEADER_LEN); |
99 | 62.0k | memcpy(&fp->body.cont.data, buf, count); |
100 | 62.0k | |
101 | 62.0k | if (len > sizeof(pkt) || (n = d->io.write(d->io_handle, pkt, |
102 | 62.0k | len)) < 0 || (size_t)n != len) |
103 | 122 | return (0); |
104 | 61.9k | |
105 | 61.9k | return (count); |
106 | 61.9k | } |
107 | | |
108 | | static int |
109 | | tx(fido_dev_t *d, uint8_t cmd, const unsigned char *buf, size_t count) |
110 | 49.7k | { |
111 | 49.7k | size_t n, sent; |
112 | 49.7k | |
113 | 49.7k | if ((sent = tx_preamble(d, cmd, buf, count)) == 0) { |
114 | 142 | fido_log_debug("%s: tx_preamble", __func__); |
115 | 142 | return (-1); |
116 | 142 | } |
117 | 49.6k | |
118 | 111k | for (uint8_t seq = 0; sent < count; sent += n) { |
119 | 62.1k | if (seq & 0x80) { |
120 | 61 | fido_log_debug("%s: seq & 0x80", __func__); |
121 | 61 | return (-1); |
122 | 61 | } |
123 | 62.0k | if ((n = tx_frame(d, seq++, buf + sent, count - sent)) == 0) { |
124 | 122 | fido_log_debug("%s: tx_frame", __func__); |
125 | 122 | return (-1); |
126 | 122 | } |
127 | 62.0k | } |
128 | 49.6k | |
129 | 49.6k | return (0); |
130 | 49.6k | } |
131 | | |
132 | | int |
133 | | fido_tx(fido_dev_t *d, uint8_t cmd, const void *buf, size_t count) |
134 | 52.4k | { |
135 | 52.4k | fido_log_debug("%s: d=%p, cmd=0x%02x, buf=%p, count=%zu", __func__, |
136 | 52.4k | (void *)d, cmd, (const void *)buf, count); |
137 | 52.4k | fido_log_xxd(buf, count); |
138 | 52.4k | |
139 | 52.4k | if (d->transport.tx != NULL) |
140 | 52.4k | return (d->transport.tx(d, cmd, buf, count)); |
141 | 52.4k | if (d->io_handle == NULL || d->io.write == NULL || count > UINT16_MAX) { |
142 | 23 | fido_log_debug("%s: invalid argument", __func__); |
143 | 23 | return (-1); |
144 | 23 | } |
145 | 52.4k | |
146 | 52.4k | return (count == 0 ? tx_empty(d, cmd) : tx(d, cmd, buf, count)); |
147 | 52.4k | } |
148 | | |
149 | | static int |
150 | | rx_frame(fido_dev_t *d, struct frame *fp, int ms) |
151 | 100k | { |
152 | 100k | int n; |
153 | 100k | |
154 | 100k | memset(fp, 0, sizeof(*fp)); |
155 | 100k | |
156 | 100k | if (d->rx_len > sizeof(*fp) || (n = d->io.read(d->io_handle, |
157 | 100k | (unsigned char *)fp, d->rx_len, ms)) < 0 || (size_t)n != d->rx_len) |
158 | 20.1k | return (-1); |
159 | 80.5k | |
160 | 80.5k | return (0); |
161 | 80.5k | } |
162 | | |
163 | | static int |
164 | | rx_preamble(fido_dev_t *d, uint8_t cmd, struct frame *fp, int ms) |
165 | 50.4k | { |
166 | 52.5k | do { |
167 | 52.5k | if (rx_frame(d, fp, ms) < 0) |
168 | 19.7k | return (-1); |
169 | 32.7k | #ifdef FIDO_FUZZ |
170 | 32.7k | fp->cid = d->cid; |
171 | 32.7k | #endif |
172 | 32.7k | } while (fp->cid == d->cid && |
173 | 32.7k | fp->body.init.cmd == (CTAP_FRAME_INIT | CTAP_KEEPALIVE)); |
174 | 50.4k | |
175 | 50.4k | if (d->rx_len > sizeof(*fp)) |
176 | 0 | return (-1); |
177 | 30.6k | |
178 | 30.6k | fido_log_debug("%s: initiation frame at %p", __func__, (void *)fp); |
179 | 30.6k | fido_log_xxd(fp, d->rx_len); |
180 | 30.6k | |
181 | 30.6k | #ifdef FIDO_FUZZ |
182 | 30.6k | fp->body.init.cmd = (CTAP_FRAME_INIT | cmd); |
183 | 30.6k | #endif |
184 | 30.6k | |
185 | 30.6k | if (fp->cid != d->cid || fp->body.init.cmd != (CTAP_FRAME_INIT | cmd)) { |
186 | 0 | fido_log_debug("%s: cid (0x%x, 0x%x), cmd (0x%02x, 0x%02x)", |
187 | 0 | __func__, fp->cid, d->cid, fp->body.init.cmd, cmd); |
188 | 0 | return (-1); |
189 | 0 | } |
190 | 30.6k | |
191 | 30.6k | return (0); |
192 | 30.6k | } |
193 | | |
194 | | static int |
195 | | rx(fido_dev_t *d, uint8_t cmd, unsigned char *buf, size_t count, int ms) |
196 | 50.4k | { |
197 | 50.4k | struct frame f; |
198 | 50.4k | size_t r, payload_len, init_data_len, cont_data_len; |
199 | 50.4k | |
200 | 50.4k | if (d->rx_len <= CTAP_INIT_HEADER_LEN || |
201 | 50.4k | d->rx_len <= CTAP_CONT_HEADER_LEN) |
202 | 50.4k | return (-1); |
203 | 50.4k | |
204 | 50.4k | init_data_len = d->rx_len - CTAP_INIT_HEADER_LEN; |
205 | 50.4k | cont_data_len = d->rx_len - CTAP_CONT_HEADER_LEN; |
206 | 50.4k | |
207 | 50.4k | if (init_data_len > sizeof(f.body.init.data) || |
208 | 50.4k | cont_data_len > sizeof(f.body.cont.data)) |
209 | 0 | return (-1); |
210 | 50.4k | |
211 | 50.4k | if (rx_preamble(d, cmd, &f, ms) < 0) { |
212 | 19.7k | fido_log_debug("%s: rx_preamble", __func__); |
213 | 19.7k | return (-1); |
214 | 19.7k | } |
215 | 30.6k | |
216 | 30.6k | payload_len = (size_t)((f.body.init.bcnth << 8) | f.body.init.bcntl); |
217 | 30.6k | fido_log_debug("%s: payload_len=%zu", __func__, payload_len); |
218 | 30.6k | |
219 | 30.6k | if (count < payload_len) { |
220 | 1.61k | fido_log_debug("%s: count < payload_len", __func__); |
221 | 1.61k | return (-1); |
222 | 1.61k | } |
223 | 29.0k | |
224 | 29.0k | if (payload_len < init_data_len) { |
225 | 14.9k | memcpy(buf, f.body.init.data, payload_len); |
226 | 14.9k | return ((int)payload_len); |
227 | 14.9k | } |
228 | 14.0k | |
229 | 14.0k | memcpy(buf, f.body.init.data, init_data_len); |
230 | 14.0k | r = init_data_len; |
231 | 14.0k | |
232 | 61.8k | for (int seq = 0; r < payload_len; seq++) { |
233 | 48.1k | if (rx_frame(d, &f, ms) < 0) { |
234 | 390 | fido_log_debug("%s: rx_frame", __func__); |
235 | 390 | return (-1); |
236 | 390 | } |
237 | 47.7k | |
238 | 47.7k | fido_log_debug("%s: continuation frame at %p", __func__, |
239 | 47.7k | (void *)&f); |
240 | 47.7k | fido_log_xxd(&f, d->rx_len); |
241 | 47.7k | |
242 | 47.7k | #ifdef FIDO_FUZZ |
243 | 47.7k | f.cid = d->cid; |
244 | 47.7k | f.body.cont.seq = (uint8_t)seq; |
245 | 47.7k | #endif |
246 | 47.7k | |
247 | 47.7k | if (f.cid != d->cid || f.body.cont.seq != seq) { |
248 | 7 | fido_log_debug("%s: cid (0x%x, 0x%x), seq (%d, %d)", |
249 | 7 | __func__, f.cid, d->cid, f.body.cont.seq, seq); |
250 | 7 | return (-1); |
251 | 7 | } |
252 | 47.7k | |
253 | 47.7k | if (payload_len - r > cont_data_len) { |
254 | 34.5k | memcpy(buf + r, f.body.cont.data, cont_data_len); |
255 | 34.5k | r += cont_data_len; |
256 | 34.5k | } else { |
257 | 13.2k | memcpy(buf + r, f.body.cont.data, payload_len - r); |
258 | 13.2k | r += payload_len - r; /* break */ |
259 | 13.2k | } |
260 | 47.7k | } |
261 | 14.0k | |
262 | 14.0k | return ((int)r); |
263 | 14.0k | } |
264 | | |
265 | | int |
266 | | fido_rx(fido_dev_t *d, uint8_t cmd, void *buf, size_t count, int ms) |
267 | 50.4k | { |
268 | 50.4k | int n; |
269 | 50.4k | |
270 | 50.4k | fido_log_debug("%s: d=%p, cmd=0x%02x, buf=%p, count=%zu, ms=%d", |
271 | 50.4k | __func__, (void *)d, cmd, (const void *)buf, count, ms); |
272 | 50.4k | |
273 | 50.4k | if (d->transport.rx != NULL) |
274 | 50.4k | return (d->transport.rx(d, cmd, buf, count, ms)); |
275 | 50.4k | if (d->io_handle == NULL || d->io.read == NULL || count > UINT16_MAX) { |
276 | 0 | fido_log_debug("%s: invalid argument", __func__); |
277 | 0 | return (-1); |
278 | 0 | } |
279 | 50.4k | if ((n = rx(d, cmd, buf, count, ms)) >= 0) { |
280 | 28.6k | fido_log_debug("%s: buf=%p, len=%d", __func__, (void *)buf, n); |
281 | 28.6k | fido_log_xxd(buf, (size_t)n); |
282 | 28.6k | } |
283 | 50.4k | |
284 | 50.4k | return (n); |
285 | 50.4k | } |
286 | | |
287 | | int |
288 | | fido_rx_cbor_status(fido_dev_t *d, int ms) |
289 | 473 | { |
290 | 473 | unsigned char reply[FIDO_MAXMSG]; |
291 | 473 | int reply_len; |
292 | 473 | |
293 | 473 | if ((reply_len = fido_rx(d, CTAP_CMD_CBOR, &reply, sizeof(reply), |
294 | 473 | ms)) < 0 || (size_t)reply_len < 1) { |
295 | 307 | fido_log_debug("%s: fido_rx", __func__); |
296 | 307 | return (FIDO_ERR_RX); |
297 | 307 | } |
298 | 166 | |
299 | 166 | return (reply[0]); |
300 | 166 | } |