Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * Copyright (c) 2018-2022 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 "packed.h" |
10 | | |
11 | | PACKED_TYPE(frame_t, |
12 | | struct frame { |
13 | | uint32_t cid; /* channel id */ |
14 | | union { |
15 | | uint8_t type; |
16 | | struct { |
17 | | uint8_t cmd; |
18 | | uint8_t bcnth; |
19 | | uint8_t bcntl; |
20 | | uint8_t data[CTAP_MAX_REPORT_LEN - CTAP_INIT_HEADER_LEN]; |
21 | | } init; |
22 | | struct { |
23 | | uint8_t seq; |
24 | | uint8_t data[CTAP_MAX_REPORT_LEN - CTAP_CONT_HEADER_LEN]; |
25 | | } cont; |
26 | | } body; |
27 | | }) |
28 | | |
29 | | #ifndef MIN |
30 | 184k | #define MIN(x, y) ((x) > (y) ? (y) : (x)) |
31 | | #endif |
32 | | |
33 | | static int |
34 | | tx_pkt(fido_dev_t *d, const void *pkt, size_t len, int *ms) |
35 | 187k | { |
36 | 187k | struct timespec ts; |
37 | 187k | int n; |
38 | | |
39 | 187k | if (fido_time_now(&ts) != 0) |
40 | 447 | return (-1); |
41 | | |
42 | 187k | n = d->io.write(d->io_handle, pkt, len); |
43 | | |
44 | 187k | if (fido_time_delta(&ts, ms) != 0) |
45 | 956 | return (-1); |
46 | | |
47 | 186k | return (n); |
48 | 187k | } |
49 | | |
50 | | static int |
51 | | tx_empty(fido_dev_t *d, uint8_t cmd, int *ms) |
52 | 2.85k | { |
53 | 2.85k | struct frame *fp; |
54 | 2.85k | unsigned char pkt[sizeof(*fp) + 1]; |
55 | 2.85k | const size_t len = d->tx_len + 1; |
56 | 2.85k | int n; |
57 | | |
58 | 2.85k | memset(&pkt, 0, sizeof(pkt)); |
59 | 2.85k | fp = (struct frame *)(pkt + 1); |
60 | 2.85k | fp->cid = d->cid; |
61 | 2.85k | fp->body.init.cmd = CTAP_FRAME_INIT | cmd; |
62 | | |
63 | 2.85k | if (len > sizeof(pkt) || (n = tx_pkt(d, pkt, len, ms)) < 0 || |
64 | 2.85k | (size_t)n != len) |
65 | 45 | return (-1); |
66 | | |
67 | 2.81k | return (0); |
68 | 2.85k | } |
69 | | |
70 | | static size_t |
71 | | tx_preamble(fido_dev_t *d, uint8_t cmd, const void *buf, size_t count, int *ms) |
72 | 103k | { |
73 | 103k | struct frame *fp; |
74 | 103k | unsigned char pkt[sizeof(*fp) + 1]; |
75 | 103k | const size_t len = d->tx_len + 1; |
76 | 103k | int n; |
77 | | |
78 | 103k | if (d->tx_len - CTAP_INIT_HEADER_LEN > sizeof(fp->body.init.data)) |
79 | 0 | return (0); |
80 | | |
81 | 103k | memset(&pkt, 0, sizeof(pkt)); |
82 | 103k | fp = (struct frame *)(pkt + 1); |
83 | 103k | fp->cid = d->cid; |
84 | 103k | fp->body.init.cmd = CTAP_FRAME_INIT | cmd; |
85 | 103k | fp->body.init.bcnth = (count >> 8) & 0xff; |
86 | 103k | fp->body.init.bcntl = count & 0xff; |
87 | 103k | count = MIN(count, d->tx_len - CTAP_INIT_HEADER_LEN); |
88 | 103k | memcpy(&fp->body.init.data, buf, count); |
89 | | |
90 | 103k | if (len > sizeof(pkt) || (n = tx_pkt(d, pkt, len, ms)) < 0 || |
91 | 103k | (size_t)n != len) |
92 | 1.14k | return (0); |
93 | | |
94 | 102k | return (count); |
95 | 103k | } |
96 | | |
97 | | static size_t |
98 | | tx_frame(fido_dev_t *d, uint8_t seq, const void *buf, size_t count, int *ms) |
99 | 81.0k | { |
100 | 81.0k | struct frame *fp; |
101 | 81.0k | unsigned char pkt[sizeof(*fp) + 1]; |
102 | 81.0k | const size_t len = d->tx_len + 1; |
103 | 81.0k | int n; |
104 | | |
105 | 81.0k | if (d->tx_len - CTAP_CONT_HEADER_LEN > sizeof(fp->body.cont.data)) |
106 | 0 | return (0); |
107 | | |
108 | 81.0k | memset(&pkt, 0, sizeof(pkt)); |
109 | 81.0k | fp = (struct frame *)(pkt + 1); |
110 | 81.0k | fp->cid = d->cid; |
111 | 81.0k | fp->body.cont.seq = seq; |
112 | 81.0k | count = MIN(count, d->tx_len - CTAP_CONT_HEADER_LEN); |
113 | 81.0k | memcpy(&fp->body.cont.data, buf, count); |
114 | | |
115 | 81.0k | if (len > sizeof(pkt) || (n = tx_pkt(d, pkt, len, ms)) < 0 || |
116 | 81.0k | (size_t)n != len) |
117 | 540 | return (0); |
118 | | |
119 | 80.5k | return (count); |
120 | 81.0k | } |
121 | | |
122 | | static int |
123 | | tx(fido_dev_t *d, uint8_t cmd, const unsigned char *buf, size_t count, int *ms) |
124 | 103k | { |
125 | 103k | size_t n, sent; |
126 | | |
127 | 103k | if ((sent = tx_preamble(d, cmd, buf, count, ms)) == 0) { |
128 | 1.14k | fido_log_debug("%s: tx_preamble", __func__); |
129 | 1.14k | return (-1); |
130 | 1.14k | } |
131 | | |
132 | 183k | for (uint8_t seq = 0; sent < count; sent += n) { |
133 | 81.1k | if (seq & 0x80) { |
134 | 68 | fido_log_debug("%s: seq & 0x80", __func__); |
135 | 68 | return (-1); |
136 | 68 | } |
137 | 81.0k | if ((n = tx_frame(d, seq++, buf + sent, count - sent, |
138 | 81.0k | ms)) == 0) { |
139 | 540 | fido_log_debug("%s: tx_frame", __func__); |
140 | 540 | return (-1); |
141 | 540 | } |
142 | 81.0k | } |
143 | | |
144 | 101k | return (0); |
145 | 102k | } |
146 | | |
147 | | static int |
148 | | transport_tx(fido_dev_t *d, uint8_t cmd, const void *buf, size_t count, int *ms) |
149 | 3.83k | { |
150 | 3.83k | struct timespec ts; |
151 | 3.83k | int n; |
152 | | |
153 | 3.83k | if (fido_time_now(&ts) != 0) |
154 | 37 | return (-1); |
155 | | |
156 | 3.80k | n = d->transport.tx(d, cmd, buf, count); |
157 | | |
158 | 3.80k | if (fido_time_delta(&ts, ms) != 0) |
159 | 45 | return (-1); |
160 | | |
161 | 3.75k | return (n); |
162 | 3.80k | } |
163 | | |
164 | | int |
165 | | fido_tx(fido_dev_t *d, uint8_t cmd, const void *buf, size_t count, int *ms) |
166 | 110k | { |
167 | 110k | fido_log_debug("%s: dev=%p, cmd=0x%02x", __func__, (void *)d, cmd); |
168 | 110k | fido_log_xxd(buf, count, "%s", __func__); |
169 | | |
170 | 110k | if (d->transport.tx != NULL) |
171 | 3.83k | return (transport_tx(d, cmd, buf, count, ms)); |
172 | 106k | if (d->io_handle == NULL || d->io.write == NULL || count > UINT16_MAX) { |
173 | 18 | fido_log_debug("%s: invalid argument", __func__); |
174 | 18 | return (-1); |
175 | 18 | } |
176 | | |
177 | 106k | return (count == 0 ? tx_empty(d, cmd, ms) : tx(d, cmd, buf, count, ms)); |
178 | 106k | } |
179 | | |
180 | | static int |
181 | | rx_frame(fido_dev_t *d, struct frame *fp, int *ms) |
182 | 221k | { |
183 | 221k | struct timespec ts; |
184 | 221k | int n; |
185 | | |
186 | 221k | memset(fp, 0, sizeof(*fp)); |
187 | | |
188 | 221k | if (fido_time_now(&ts) != 0) |
189 | 299 | return (-1); |
190 | | |
191 | 221k | if (d->rx_len > sizeof(*fp) || (n = d->io.read(d->io_handle, |
192 | 221k | (unsigned char *)fp, d->rx_len, *ms)) < 0 || (size_t)n != d->rx_len) |
193 | 44.5k | return (-1); |
194 | | |
195 | 177k | return (fido_time_delta(&ts, ms)); |
196 | 221k | } |
197 | | |
198 | | static int |
199 | | rx_preamble(fido_dev_t *d, uint8_t cmd, struct frame *fp, int *ms) |
200 | 103k | { |
201 | 106k | do { |
202 | 106k | if (rx_frame(d, fp, ms) < 0) |
203 | 43.2k | return (-1); |
204 | 63.0k | #ifdef FIDO_FUZZ |
205 | 63.0k | fp->cid = d->cid; |
206 | 63.0k | #endif |
207 | 63.0k | } while (fp->cid != d->cid || (fp->cid == d->cid && |
208 | 63.0k | fp->body.init.cmd == (CTAP_FRAME_INIT | CTAP_KEEPALIVE))); |
209 | | |
210 | 59.8k | if (d->rx_len > sizeof(*fp)) |
211 | 0 | return (-1); |
212 | | |
213 | 59.8k | fido_log_xxd(fp, d->rx_len, "%s", __func__); |
214 | 59.8k | #ifdef FIDO_FUZZ |
215 | 59.8k | fp->body.init.cmd = (CTAP_FRAME_INIT | cmd); |
216 | 59.8k | #endif |
217 | | |
218 | 59.8k | if (fp->cid != d->cid || fp->body.init.cmd != (CTAP_FRAME_INIT | cmd)) { |
219 | 0 | fido_log_debug("%s: cid (0x%x, 0x%x), cmd (0x%02x, 0x%02x)", |
220 | 0 | __func__, fp->cid, d->cid, fp->body.init.cmd, cmd); |
221 | 0 | return (-1); |
222 | 0 | } |
223 | | |
224 | 59.8k | return (0); |
225 | 59.8k | } |
226 | | |
227 | | static int |
228 | | rx(fido_dev_t *d, uint8_t cmd, unsigned char *buf, size_t count, int *ms) |
229 | 103k | { |
230 | 103k | struct frame f; |
231 | 103k | size_t r, payload_len, init_data_len, cont_data_len; |
232 | | |
233 | 103k | if (d->rx_len <= CTAP_INIT_HEADER_LEN || |
234 | 103k | d->rx_len <= CTAP_CONT_HEADER_LEN) |
235 | 0 | return (-1); |
236 | | |
237 | 103k | init_data_len = d->rx_len - CTAP_INIT_HEADER_LEN; |
238 | 103k | cont_data_len = d->rx_len - CTAP_CONT_HEADER_LEN; |
239 | | |
240 | 103k | if (init_data_len > sizeof(f.body.init.data) || |
241 | 103k | cont_data_len > sizeof(f.body.cont.data)) |
242 | 0 | return (-1); |
243 | | |
244 | 103k | if (rx_preamble(d, cmd, &f, ms) < 0) { |
245 | 43.2k | fido_log_debug("%s: rx_preamble", __func__); |
246 | 43.2k | return (-1); |
247 | 43.2k | } |
248 | | |
249 | 59.8k | payload_len = (size_t)((f.body.init.bcnth << 8) | f.body.init.bcntl); |
250 | 59.8k | fido_log_debug("%s: payload_len=%zu", __func__, payload_len); |
251 | | |
252 | 59.8k | if (count < payload_len) { |
253 | 4.72k | fido_log_debug("%s: count < payload_len", __func__); |
254 | 4.72k | return (-1); |
255 | 4.72k | } |
256 | | |
257 | 55.0k | if (payload_len < init_data_len) { |
258 | 28.9k | memcpy(buf, f.body.init.data, payload_len); |
259 | 28.9k | return ((int)payload_len); |
260 | 28.9k | } |
261 | | |
262 | 26.1k | memcpy(buf, f.body.init.data, init_data_len); |
263 | 26.1k | r = init_data_len; |
264 | | |
265 | 139k | for (int seq = 0; r < payload_len; seq++) { |
266 | 115k | if (rx_frame(d, &f, ms) < 0) { |
267 | 1.95k | fido_log_debug("%s: rx_frame", __func__); |
268 | 1.95k | return (-1); |
269 | 1.95k | } |
270 | | |
271 | 113k | fido_log_xxd(&f, d->rx_len, "%s", __func__); |
272 | 113k | #ifdef FIDO_FUZZ |
273 | 113k | f.cid = d->cid; |
274 | 113k | f.body.cont.seq = (uint8_t)seq; |
275 | 113k | #endif |
276 | | |
277 | 113k | if (f.cid != d->cid || f.body.cont.seq != seq) { |
278 | 20 | fido_log_debug("%s: cid (0x%x, 0x%x), seq (%d, %d)", |
279 | 20 | __func__, f.cid, d->cid, f.body.cont.seq, seq); |
280 | 20 | return (-1); |
281 | 20 | } |
282 | | |
283 | 113k | if (payload_len - r > cont_data_len) { |
284 | 91.1k | memcpy(buf + r, f.body.cont.data, cont_data_len); |
285 | 91.1k | r += cont_data_len; |
286 | 91.1k | } else { |
287 | 22.5k | memcpy(buf + r, f.body.cont.data, payload_len - r); |
288 | 22.5k | r += payload_len - r; /* break */ |
289 | 22.5k | } |
290 | 113k | } |
291 | | |
292 | 24.1k | return ((int)r); |
293 | 26.1k | } |
294 | | |
295 | | static int |
296 | | transport_rx(fido_dev_t *d, uint8_t cmd, void *buf, size_t count, int *ms) |
297 | 3.44k | { |
298 | 3.44k | struct timespec ts; |
299 | 3.44k | int n; |
300 | | |
301 | 3.44k | if (fido_time_now(&ts) != 0) |
302 | 44 | return (-1); |
303 | | |
304 | 3.40k | n = d->transport.rx(d, cmd, buf, count, *ms); |
305 | | |
306 | 3.40k | if (fido_time_delta(&ts, ms) != 0) |
307 | 61 | return (-1); |
308 | | |
309 | 3.34k | return (n); |
310 | 3.40k | } |
311 | | |
312 | | int |
313 | | fido_rx(fido_dev_t *d, uint8_t cmd, void *buf, size_t count, int *ms) |
314 | 106k | { |
315 | 106k | int n; |
316 | | |
317 | 106k | fido_log_debug("%s: dev=%p, cmd=0x%02x, ms=%d", __func__, (void *)d, |
318 | 106k | cmd, *ms); |
319 | | |
320 | 106k | if (d->transport.rx != NULL) |
321 | 3.44k | return (transport_rx(d, cmd, buf, count, ms)); |
322 | 103k | if (d->io_handle == NULL || d->io.read == NULL || count > UINT16_MAX) { |
323 | 0 | fido_log_debug("%s: invalid argument", __func__); |
324 | 0 | return (-1); |
325 | 0 | } |
326 | 103k | if ((n = rx(d, cmd, buf, count, ms)) >= 0) |
327 | 53.1k | fido_log_xxd(buf, (size_t)n, "%s", __func__); |
328 | | |
329 | 103k | return (n); |
330 | 103k | } |
331 | | |
332 | | int |
333 | | fido_rx_cbor_status(fido_dev_t *d, int *ms) |
334 | 2.81k | { |
335 | 2.81k | unsigned char *msg; |
336 | 2.81k | int msglen; |
337 | 2.81k | int r; |
338 | | |
339 | 2.81k | if ((msg = malloc(FIDO_MAXMSG)) == NULL) { |
340 | 18 | r = FIDO_ERR_INTERNAL; |
341 | 18 | goto out; |
342 | 18 | } |
343 | | |
344 | 2.79k | if ((msglen = fido_rx(d, CTAP_CMD_CBOR, msg, FIDO_MAXMSG, ms)) < 0 || |
345 | 2.79k | (size_t)msglen < 1) { |
346 | 1.84k | fido_log_debug("%s: fido_rx", __func__); |
347 | 1.84k | r = FIDO_ERR_RX; |
348 | 1.84k | goto out; |
349 | 1.84k | } |
350 | | |
351 | 949 | r = msg[0]; |
352 | 2.81k | out: |
353 | 2.81k | freezero(msg, FIDO_MAXMSG); |
354 | | |
355 | 2.81k | return (r); |
356 | 949 | } |