Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * Copyright (c) 2020 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 <sys/socket.h> |
8 | | |
9 | | #include <linux/genetlink.h> |
10 | | #include <linux/netlink.h> |
11 | | #include <linux/nfc.h> |
12 | | |
13 | | #include <errno.h> |
14 | | #include <limits.h> |
15 | | |
16 | | #include "fido.h" |
17 | | #include "netlink.h" |
18 | | |
19 | | #ifdef FIDO_FUZZ |
20 | | static ssize_t (*fuzz_read)(int, void *, size_t); |
21 | | static ssize_t (*fuzz_write)(int, const void *, size_t); |
22 | 561k | # define READ fuzz_read |
23 | 562k | # define WRITE fuzz_write |
24 | | #else |
25 | | # define READ read |
26 | | # define WRITE write |
27 | | #endif |
28 | | |
29 | | #ifndef SOL_NETLINK |
30 | | #define SOL_NETLINK 270 |
31 | | #endif |
32 | | |
33 | 491 | #define NETLINK_POLL_MS 100 |
34 | | |
35 | | /* XXX avoid signed NLA_ALIGNTO */ |
36 | | #undef NLA_HDRLEN |
37 | | #define NLA_HDRLEN NLMSG_ALIGN(sizeof(struct nlattr)) |
38 | | |
39 | | typedef struct nlmsgbuf { |
40 | | size_t siz; /* alloc size */ |
41 | | size_t len; /* of payload */ |
42 | | unsigned char *ptr; /* in payload */ |
43 | | union { |
44 | | struct nlmsghdr nlmsg; |
45 | | char buf[NLMSG_HDRLEN]; /* align */ |
46 | | } u; |
47 | | unsigned char payload[]; |
48 | | } nlmsgbuf_t; |
49 | | |
50 | | typedef struct genlmsgbuf { |
51 | | union { |
52 | | struct genlmsghdr genl; |
53 | | char buf[GENL_HDRLEN]; /* align */ |
54 | | } u; |
55 | | } genlmsgbuf_t; |
56 | | |
57 | | typedef struct nlamsgbuf { |
58 | | size_t siz; /* alloc size */ |
59 | | size_t len; /* of payload */ |
60 | | unsigned char *ptr; /* in payload */ |
61 | | union { |
62 | | struct nlattr nla; |
63 | | char buf[NLA_HDRLEN]; /* align */ |
64 | | } u; |
65 | | unsigned char payload[]; |
66 | | } nlamsgbuf_t; |
67 | | |
68 | | typedef struct nl_family { |
69 | | uint16_t id; |
70 | | uint32_t mcastgrp; |
71 | | } nl_family_t; |
72 | | |
73 | | typedef struct nl_poll { |
74 | | uint32_t dev; |
75 | | unsigned int eventcnt; |
76 | | } nl_poll_t; |
77 | | |
78 | | typedef struct nl_target { |
79 | | int found; |
80 | | uint32_t *value; |
81 | | } nl_target_t; |
82 | | |
83 | | static const void * |
84 | | nlmsg_ptr(const nlmsgbuf_t *m) |
85 | 1.12M | { |
86 | 1.12M | return (&m->u.nlmsg); |
87 | 1.12M | } |
88 | | |
89 | | static size_t |
90 | | nlmsg_len(const nlmsgbuf_t *m) |
91 | 1.68M | { |
92 | 1.68M | return (m->u.nlmsg.nlmsg_len); |
93 | 1.68M | } |
94 | | |
95 | | static uint16_t |
96 | | nlmsg_type(const nlmsgbuf_t *m) |
97 | 8.16k | { |
98 | 8.16k | return (m->u.nlmsg.nlmsg_type); |
99 | 8.16k | } |
100 | | |
101 | | static nlmsgbuf_t * |
102 | | nlmsg_new(uint16_t type, uint16_t flags, size_t len) |
103 | 570k | { |
104 | 570k | nlmsgbuf_t *m; |
105 | 570k | size_t siz; |
106 | | |
107 | 570k | if (len > SIZE_MAX - sizeof(*m) || |
108 | 570k | (siz = sizeof(*m) + len) > UINT16_MAX || |
109 | 570k | (m = calloc(1, siz)) == NULL) |
110 | 570k | return (NULL); |
111 | | |
112 | 569k | m->siz = siz; |
113 | 569k | m->len = len; |
114 | 569k | m->ptr = m->payload; |
115 | 569k | m->u.nlmsg.nlmsg_type = type; |
116 | 569k | m->u.nlmsg.nlmsg_flags = NLM_F_REQUEST | flags; |
117 | 569k | m->u.nlmsg.nlmsg_len = NLMSG_HDRLEN; |
118 | | |
119 | 569k | return (m); |
120 | 569k | } |
121 | | |
122 | | static nlamsgbuf_t * |
123 | | nla_from_buf(const unsigned char **ptr, size_t *len) |
124 | 19.2k | { |
125 | 19.2k | nlamsgbuf_t h, *a; |
126 | 19.2k | size_t nlalen, skip; |
127 | | |
128 | 19.2k | if (*len < sizeof(h.u)) |
129 | 2.47k | return (NULL); |
130 | | |
131 | 16.7k | memset(&h, 0, sizeof(h)); |
132 | 16.7k | memcpy(&h.u, *ptr, sizeof(h.u)); |
133 | | |
134 | 16.7k | if ((nlalen = h.u.nla.nla_len) < sizeof(h.u) || nlalen > *len || |
135 | 16.7k | nlalen - sizeof(h.u) > UINT16_MAX || |
136 | 16.7k | nlalen > SIZE_MAX - sizeof(*a) || |
137 | 16.7k | (skip = NLMSG_ALIGN(nlalen)) > *len || |
138 | 16.7k | (a = calloc(1, sizeof(*a) + nlalen - sizeof(h.u))) == NULL) |
139 | 16.7k | return (NULL); |
140 | | |
141 | 14.7k | memcpy(&a->u, *ptr, nlalen); |
142 | 14.7k | a->siz = sizeof(*a) + nlalen - sizeof(h.u); |
143 | 14.7k | a->ptr = a->payload; |
144 | 14.7k | a->len = nlalen - sizeof(h.u); |
145 | 14.7k | *ptr += skip; |
146 | 14.7k | *len -= skip; |
147 | | |
148 | 14.7k | return (a); |
149 | 14.7k | } |
150 | | |
151 | | static nlamsgbuf_t * |
152 | | nla_getattr(nlamsgbuf_t *a) |
153 | 6.86k | { |
154 | 6.86k | return (nla_from_buf((void *)&a->ptr, &a->len)); |
155 | 6.86k | } |
156 | | |
157 | | static uint16_t |
158 | | nla_type(const nlamsgbuf_t *a) |
159 | 21.6k | { |
160 | 21.6k | return (a->u.nla.nla_type); |
161 | 21.6k | } |
162 | | |
163 | | static nlamsgbuf_t * |
164 | | nlmsg_getattr(nlmsgbuf_t *m) |
165 | 12.3k | { |
166 | 12.3k | return (nla_from_buf((void *)&m->ptr, &m->len)); |
167 | 12.3k | } |
168 | | |
169 | | static int |
170 | | nla_read(nlamsgbuf_t *a, void *buf, size_t cnt) |
171 | 2.59k | { |
172 | 2.59k | if (cnt > a->u.nla.nla_len || |
173 | 2.59k | fido_buf_read((void *)&a->ptr, &a->len, buf, cnt) < 0) |
174 | 16 | return (-1); |
175 | | |
176 | 2.57k | a->u.nla.nla_len = (uint16_t)(a->u.nla.nla_len - cnt); |
177 | | |
178 | 2.57k | return (0); |
179 | 2.57k | } |
180 | | |
181 | | static nlmsgbuf_t * |
182 | | nlmsg_from_buf(const unsigned char **ptr, size_t *len) |
183 | 5.48k | { |
184 | 5.48k | nlmsgbuf_t h, *m; |
185 | 5.48k | size_t msglen, skip; |
186 | | |
187 | 5.48k | if (*len < sizeof(h.u)) |
188 | 566 | return (NULL); |
189 | | |
190 | 4.92k | memset(&h, 0, sizeof(h)); |
191 | 4.92k | memcpy(&h.u, *ptr, sizeof(h.u)); |
192 | | |
193 | 4.92k | if ((msglen = h.u.nlmsg.nlmsg_len) < sizeof(h.u) || msglen > *len || |
194 | 4.92k | msglen - sizeof(h.u) > UINT16_MAX || |
195 | 4.92k | (skip = NLMSG_ALIGN(msglen)) > *len || |
196 | 4.92k | (m = nlmsg_new(0, 0, msglen - sizeof(h.u))) == NULL) |
197 | 4.92k | return (NULL); |
198 | | |
199 | 4.52k | memcpy(&m->u, *ptr, msglen); |
200 | 4.52k | *ptr += skip; |
201 | 4.52k | *len -= skip; |
202 | | |
203 | 4.52k | return (m); |
204 | 4.52k | } |
205 | | |
206 | | static int |
207 | | nlmsg_read(nlmsgbuf_t *m, void *buf, size_t cnt) |
208 | 3.06k | { |
209 | 3.06k | if (cnt > m->u.nlmsg.nlmsg_len || |
210 | 3.06k | fido_buf_read((void *)&m->ptr, &m->len, buf, cnt) < 0) |
211 | 210 | return (-1); |
212 | | |
213 | 2.85k | m->u.nlmsg.nlmsg_len = (uint32_t)(m->u.nlmsg.nlmsg_len - cnt); |
214 | | |
215 | 2.85k | return (0); |
216 | 2.85k | } |
217 | | |
218 | | static int |
219 | | nlmsg_write(nlmsgbuf_t *m, const void *buf, size_t cnt) |
220 | 3.94M | { |
221 | 3.94M | if (cnt > UINT32_MAX - m->u.nlmsg.nlmsg_len || |
222 | 3.94M | fido_buf_write(&m->ptr, &m->len, buf, cnt) < 0) |
223 | 0 | return (-1); |
224 | | |
225 | 3.94M | m->u.nlmsg.nlmsg_len = (uint32_t)(m->u.nlmsg.nlmsg_len + cnt); |
226 | | |
227 | 3.94M | return (0); |
228 | 3.94M | } |
229 | | |
230 | | static int |
231 | | nlmsg_set_genl(nlmsgbuf_t *m, uint8_t cmd) |
232 | 564k | { |
233 | 564k | genlmsgbuf_t g; |
234 | | |
235 | 564k | memset(&g, 0, sizeof(g)); |
236 | 564k | g.u.genl.cmd = cmd; |
237 | 564k | g.u.genl.version = NFC_GENL_VERSION; |
238 | | |
239 | 564k | return (nlmsg_write(m, &g, sizeof(g))); |
240 | 564k | } |
241 | | |
242 | | static int |
243 | | nlmsg_get_genl(nlmsgbuf_t *m, uint8_t cmd) |
244 | 2.18k | { |
245 | 2.18k | genlmsgbuf_t g; |
246 | | |
247 | 2.18k | memset(&g, 0, sizeof(g)); |
248 | | |
249 | 2.18k | if (nlmsg_read(m, &g, sizeof(g)) < 0 || g.u.genl.cmd != cmd) |
250 | 492 | return (-1); |
251 | | |
252 | 1.69k | return (0); |
253 | 1.69k | } |
254 | | |
255 | | static int |
256 | | nlmsg_get_status(nlmsgbuf_t *m) |
257 | 882 | { |
258 | 882 | int status; |
259 | | |
260 | 882 | if (nlmsg_read(m, &status, sizeof(status)) < 0 || status == INT_MIN) |
261 | 882 | return (-1); |
262 | 863 | if (status < 0) |
263 | 139 | status = -status; |
264 | | |
265 | 863 | return (status); |
266 | 863 | } |
267 | | |
268 | | static int |
269 | | nlmsg_setattr(nlmsgbuf_t *m, uint16_t type, const void *ptr, size_t len) |
270 | 1.12M | { |
271 | 1.12M | int r; |
272 | 1.12M | char *padding; |
273 | 1.12M | size_t skip; |
274 | 1.12M | nlamsgbuf_t a; |
275 | | |
276 | 1.12M | if ((skip = NLMSG_ALIGN(len)) > UINT16_MAX - sizeof(a.u) || |
277 | 1.12M | skip < len || (padding = calloc(1, skip - len)) == NULL) |
278 | 1.12M | return (-1); |
279 | | |
280 | 1.12M | memset(&a, 0, sizeof(a)); |
281 | 1.12M | a.u.nla.nla_type = type; |
282 | 1.12M | a.u.nla.nla_len = (uint16_t)(len + sizeof(a.u)); |
283 | 1.12M | r = nlmsg_write(m, &a.u, sizeof(a.u)) < 0 || |
284 | 1.12M | nlmsg_write(m, ptr, len) < 0 || |
285 | 1.12M | nlmsg_write(m, padding, skip - len) < 0 ? -1 : 0; |
286 | | |
287 | 1.12M | free(padding); |
288 | | |
289 | 1.12M | return (r); |
290 | 1.12M | } |
291 | | |
292 | | static int |
293 | | nlmsg_set_u16(nlmsgbuf_t *m, uint16_t type, uint16_t val) |
294 | 563k | { |
295 | 563k | return (nlmsg_setattr(m, type, &val, sizeof(val))); |
296 | 563k | } |
297 | | |
298 | | static int |
299 | | nlmsg_set_u32(nlmsgbuf_t *m, uint16_t type, uint32_t val) |
300 | 1.84k | { |
301 | 1.84k | return (nlmsg_setattr(m, type, &val, sizeof(val))); |
302 | 1.84k | } |
303 | | |
304 | | static int |
305 | | nlmsg_set_str(nlmsgbuf_t *m, uint16_t type, const char *val) |
306 | 562k | { |
307 | 562k | return (nlmsg_setattr(m, type, val, strlen(val) + 1)); |
308 | 562k | } |
309 | | |
310 | | static int |
311 | | nla_get_u16(nlamsgbuf_t *a, uint16_t *v) |
312 | 1.00k | { |
313 | 1.00k | return (nla_read(a, v, sizeof(*v))); |
314 | 1.00k | } |
315 | | |
316 | | static int |
317 | | nla_get_u32(nlamsgbuf_t *a, uint32_t *v) |
318 | 1.21k | { |
319 | 1.21k | return (nla_read(a, v, sizeof(*v))); |
320 | 1.21k | } |
321 | | |
322 | | static char * |
323 | | nla_get_str(nlamsgbuf_t *a) |
324 | 410 | { |
325 | 410 | size_t n; |
326 | 410 | char *s = NULL; |
327 | | |
328 | 410 | if ((n = a->len) < 1 || a->ptr[n - 1] != '\0' || |
329 | 410 | (s = calloc(1, n)) == NULL || nla_read(a, s, n) < 0) { |
330 | 33 | free(s); |
331 | 33 | return (NULL); |
332 | 33 | } |
333 | 377 | s[n - 1] = '\0'; |
334 | | |
335 | 377 | return (s); |
336 | 377 | } |
337 | | |
338 | | static int |
339 | | nlmsg_tx(int fd, const nlmsgbuf_t *m) |
340 | 562k | { |
341 | 562k | ssize_t r; |
342 | | |
343 | 562k | if ((r = WRITE(fd, nlmsg_ptr(m), nlmsg_len(m))) == -1) { |
344 | 1.55k | fido_log_error(errno, "%s: write", __func__); |
345 | 1.55k | return (-1); |
346 | 1.55k | } |
347 | 560k | if (r < 0 || (size_t)r != nlmsg_len(m)) { |
348 | 0 | fido_log_debug("%s: %zd != %zu", __func__, r, nlmsg_len(m)); |
349 | 0 | return (-1); |
350 | 0 | } |
351 | 560k | fido_log_xxd(nlmsg_ptr(m), nlmsg_len(m), "%s", __func__); |
352 | | |
353 | 560k | return (0); |
354 | 560k | } |
355 | | |
356 | | static ssize_t |
357 | | nlmsg_rx(int fd, unsigned char *ptr, size_t len, int ms) |
358 | 561k | { |
359 | 561k | ssize_t r; |
360 | | |
361 | 561k | if (len > SSIZE_MAX) { |
362 | 0 | fido_log_debug("%s: len", __func__); |
363 | 0 | return (-1); |
364 | 0 | } |
365 | 561k | if (fido_hid_unix_wait(fd, ms, NULL) < 0) { |
366 | 0 | fido_log_debug("%s: fido_hid_unix_wait", __func__); |
367 | 0 | return (-1); |
368 | 0 | } |
369 | 561k | if ((r = READ(fd, ptr, len)) == -1) { |
370 | 0 | fido_log_error(errno, "%s: read %zd", __func__, r); |
371 | 0 | return (-1); |
372 | 0 | } |
373 | 561k | fido_log_xxd(ptr, (size_t)r, "%s", __func__); |
374 | | |
375 | 561k | return (r); |
376 | 561k | } |
377 | | |
378 | | static int |
379 | | nlmsg_iter(nlmsgbuf_t *m, void *arg, int (*parser)(nlamsgbuf_t *, void *)) |
380 | 1.67k | { |
381 | 1.67k | nlamsgbuf_t *a; |
382 | 1.67k | int r; |
383 | | |
384 | 12.3k | while ((a = nlmsg_getattr(m)) != NULL) { |
385 | 10.8k | r = parser(a, arg); |
386 | 10.8k | free(a); |
387 | 10.8k | if (r < 0) { |
388 | 172 | fido_log_debug("%s: parser", __func__); |
389 | 172 | return (-1); |
390 | 172 | } |
391 | 10.8k | } |
392 | | |
393 | 1.67k | return (0); |
394 | 1.67k | } |
395 | | |
396 | | static int |
397 | | nla_iter(nlamsgbuf_t *g, void *arg, int (*parser)(nlamsgbuf_t *, void *)) |
398 | 3.31k | { |
399 | 3.31k | nlamsgbuf_t *a; |
400 | 3.31k | int r; |
401 | | |
402 | 6.86k | while ((a = nla_getattr(g)) != NULL) { |
403 | 3.86k | r = parser(a, arg); |
404 | 3.86k | free(a); |
405 | 3.86k | if (r < 0) { |
406 | 320 | fido_log_debug("%s: parser", __func__); |
407 | 320 | return (-1); |
408 | 320 | } |
409 | 3.86k | } |
410 | | |
411 | 3.31k | return (0); |
412 | 3.31k | } |
413 | | |
414 | | static int |
415 | | nl_parse_reply(const uint8_t *blob, size_t blob_len, uint16_t msg_type, |
416 | | uint8_t genl_cmd, void *arg, int (*parser)(nlamsgbuf_t *, void *)) |
417 | 561k | { |
418 | 561k | nlmsgbuf_t *m; |
419 | 561k | int r; |
420 | | |
421 | 564k | while (blob_len) { |
422 | 5.48k | if ((m = nlmsg_from_buf(&blob, &blob_len)) == NULL) { |
423 | 967 | fido_log_debug("%s: nlmsg", __func__); |
424 | 967 | return (-1); |
425 | 967 | } |
426 | 4.52k | if (nlmsg_type(m) == NLMSG_ERROR) { |
427 | 882 | r = nlmsg_get_status(m); |
428 | 882 | free(m); |
429 | 882 | return (r); |
430 | 882 | } |
431 | 3.63k | if (nlmsg_type(m) != msg_type || |
432 | 3.63k | nlmsg_get_genl(m, genl_cmd) < 0) { |
433 | 1.94k | fido_log_debug("%s: skipping", __func__); |
434 | 1.94k | free(m); |
435 | 1.94k | continue; |
436 | 1.94k | } |
437 | 1.69k | if (parser != NULL && nlmsg_iter(m, arg, parser) < 0) { |
438 | 172 | fido_log_debug("%s: nlmsg_iter", __func__); |
439 | 172 | free(m); |
440 | 172 | return (-1); |
441 | 172 | } |
442 | 1.51k | free(m); |
443 | 1.51k | } |
444 | | |
445 | 561k | return (0); |
446 | 561k | } |
447 | | |
448 | | static int |
449 | | parse_mcastgrp(nlamsgbuf_t *a, void *arg) |
450 | 2.01k | { |
451 | 2.01k | nl_family_t *family = arg; |
452 | 2.01k | char *name; |
453 | | |
454 | 2.01k | switch (nla_type(a)) { |
455 | 410 | case CTRL_ATTR_MCAST_GRP_NAME: |
456 | 410 | if ((name = nla_get_str(a)) == NULL || |
457 | 410 | strcmp(name, NFC_GENL_MCAST_EVENT_NAME) != 0) { |
458 | 156 | free(name); |
459 | 156 | return (-1); /* XXX skip? */ |
460 | 156 | } |
461 | 254 | free(name); |
462 | 254 | return (0); |
463 | 1.32k | case CTRL_ATTR_MCAST_GRP_ID: |
464 | 1.32k | if (family->mcastgrp) |
465 | 415 | break; |
466 | 909 | if (nla_get_u32(a, &family->mcastgrp) < 0) { |
467 | 4 | fido_log_debug("%s: group", __func__); |
468 | 4 | return (-1); |
469 | 4 | } |
470 | 905 | return (0); |
471 | 693 | } |
472 | | |
473 | 693 | fido_log_debug("%s: ignoring nla 0x%x", __func__, nla_type(a)); |
474 | | |
475 | 693 | return (0); |
476 | 693 | } |
477 | | |
478 | | static int |
479 | | parse_mcastgrps(nlamsgbuf_t *a, void *arg) |
480 | 1.85k | { |
481 | 1.85k | return (nla_iter(a, arg, parse_mcastgrp)); |
482 | 1.85k | } |
483 | | |
484 | | static int |
485 | | parse_family(nlamsgbuf_t *a, void *arg) |
486 | 10.1k | { |
487 | 10.1k | nl_family_t *family = arg; |
488 | | |
489 | 10.1k | switch (nla_type(a)) { |
490 | 1.60k | case CTRL_ATTR_FAMILY_ID: |
491 | 1.60k | if (family->id) |
492 | 603 | break; |
493 | 1.00k | if (nla_get_u16(a, &family->id) < 0) { |
494 | 8 | fido_log_debug("%s: id", __func__); |
495 | 8 | return (-1); |
496 | 8 | } |
497 | 996 | return (0); |
498 | 1.45k | case CTRL_ATTR_MCAST_GROUPS: |
499 | 1.45k | return (nla_iter(a, family, parse_mcastgrps)); |
500 | 7.67k | } |
501 | | |
502 | 7.67k | fido_log_debug("%s: ignoring nla 0x%x", __func__, nla_type(a)); |
503 | | |
504 | 7.67k | return (0); |
505 | 7.67k | } |
506 | | |
507 | | static int |
508 | | nl_get_nfc_family(int fd, uint16_t *type, uint32_t *mcastgrp) |
509 | 565k | { |
510 | 565k | nlmsgbuf_t *m; |
511 | 565k | uint8_t reply[512]; |
512 | 565k | nl_family_t family; |
513 | 565k | ssize_t r; |
514 | 565k | int ok; |
515 | | |
516 | 565k | if ((m = nlmsg_new(GENL_ID_CTRL, 0, 64)) == NULL || |
517 | 565k | nlmsg_set_genl(m, CTRL_CMD_GETFAMILY) < 0 || |
518 | 565k | nlmsg_set_u16(m, CTRL_ATTR_FAMILY_ID, GENL_ID_CTRL) < 0 || |
519 | 565k | nlmsg_set_str(m, CTRL_ATTR_FAMILY_NAME, NFC_GENL_NAME) < 0 || |
520 | 565k | nlmsg_tx(fd, m) < 0) { |
521 | 5.58k | free(m); |
522 | 5.58k | return (-1); |
523 | 5.58k | } |
524 | 559k | free(m); |
525 | 559k | memset(&family, 0, sizeof(family)); |
526 | 559k | if ((r = nlmsg_rx(fd, reply, sizeof(reply), -1)) < 0) { |
527 | 0 | fido_log_debug("%s: nlmsg_rx", __func__); |
528 | 0 | return (-1); |
529 | 0 | } |
530 | 559k | if ((ok = nl_parse_reply(reply, (size_t)r, GENL_ID_CTRL, |
531 | 559k | CTRL_CMD_NEWFAMILY, &family, parse_family)) != 0) { |
532 | 1.16k | fido_log_debug("%s: nl_parse_reply: %d", __func__, ok); |
533 | 1.16k | return (-1); |
534 | 1.16k | } |
535 | 558k | if (family.id == 0 || family.mcastgrp == 0) { |
536 | 557k | fido_log_debug("%s: missing attr", __func__); |
537 | 557k | return (-1); |
538 | 557k | } |
539 | 676 | *type = family.id; |
540 | 676 | *mcastgrp = family.mcastgrp; |
541 | | |
542 | 676 | return (0); |
543 | 676 | } |
544 | | |
545 | | static int |
546 | | parse_target(nlamsgbuf_t *a, void *arg) |
547 | 185 | { |
548 | 185 | nl_target_t *t = arg; |
549 | | |
550 | 185 | if (t->found || nla_type(a) != NFC_ATTR_TARGET_INDEX) { |
551 | 173 | fido_log_debug("%s: ignoring nla 0x%x", __func__, nla_type(a)); |
552 | 173 | return (0); |
553 | 173 | } |
554 | 12 | if (nla_get_u32(a, t->value) < 0) { |
555 | 2 | fido_log_debug("%s: target", __func__); |
556 | 2 | return (-1); |
557 | 2 | } |
558 | 10 | t->found = 1; |
559 | | |
560 | 10 | return (0); |
561 | 10 | } |
562 | | |
563 | | int |
564 | | fido_nl_power_nfc(fido_nl_t *nl, uint32_t dev) |
565 | 676 | { |
566 | 676 | nlmsgbuf_t *m; |
567 | 676 | uint8_t reply[512]; |
568 | 676 | ssize_t r; |
569 | 676 | int ok; |
570 | | |
571 | 676 | if ((m = nlmsg_new(nl->nfc_type, NLM_F_ACK, 64)) == NULL || |
572 | 676 | nlmsg_set_genl(m, NFC_CMD_DEV_UP) < 0 || |
573 | 676 | nlmsg_set_u32(m, NFC_ATTR_DEVICE_INDEX, dev) < 0 || |
574 | 676 | nlmsg_tx(nl->fd, m) < 0) { |
575 | 235 | free(m); |
576 | 235 | return (-1); |
577 | 235 | } |
578 | 441 | free(m); |
579 | 441 | if ((r = nlmsg_rx(nl->fd, reply, sizeof(reply), -1)) < 0) { |
580 | 0 | fido_log_debug("%s: nlmsg_rx", __func__); |
581 | 0 | return (-1); |
582 | 0 | } |
583 | 441 | if ((ok = nl_parse_reply(reply, (size_t)r, nl->nfc_type, |
584 | 441 | NFC_CMD_DEV_UP, NULL, NULL)) != 0 && ok != EALREADY) { |
585 | 155 | fido_log_debug("%s: nl_parse_reply: %d", __func__, ok); |
586 | 155 | return (-1); |
587 | 155 | } |
588 | | |
589 | 286 | return (0); |
590 | 286 | } |
591 | | |
592 | | static int |
593 | | nl_nfc_poll(fido_nl_t *nl, uint32_t dev) |
594 | 600 | { |
595 | 600 | nlmsgbuf_t *m; |
596 | 600 | uint8_t reply[512]; |
597 | 600 | ssize_t r; |
598 | 600 | int ok; |
599 | | |
600 | 600 | if ((m = nlmsg_new(nl->nfc_type, NLM_F_ACK, 64)) == NULL || |
601 | 600 | nlmsg_set_genl(m, NFC_CMD_START_POLL) < 0 || |
602 | 600 | nlmsg_set_u32(m, NFC_ATTR_DEVICE_INDEX, dev) < 0 || |
603 | 600 | nlmsg_set_u32(m, NFC_ATTR_PROTOCOLS, NFC_PROTO_ISO14443_MASK) < 0 || |
604 | 600 | nlmsg_tx(nl->fd, m) < 0) { |
605 | 16 | free(m); |
606 | 16 | return (-1); |
607 | 16 | } |
608 | 584 | free(m); |
609 | 584 | if ((r = nlmsg_rx(nl->fd, reply, sizeof(reply), -1)) < 0) { |
610 | 0 | fido_log_debug("%s: nlmsg_rx", __func__); |
611 | 0 | return (-1); |
612 | 0 | } |
613 | 584 | if ((ok = nl_parse_reply(reply, (size_t)r, nl->nfc_type, |
614 | 584 | NFC_CMD_START_POLL, NULL, NULL)) != 0) { |
615 | 93 | fido_log_debug("%s: nl_parse_reply: %d", __func__, ok); |
616 | 93 | return (-1); |
617 | 93 | } |
618 | | |
619 | 491 | return (0); |
620 | 491 | } |
621 | | |
622 | | static int |
623 | | nl_dump_nfc_target(fido_nl_t *nl, uint32_t dev, uint32_t *target, int ms) |
624 | 78 | { |
625 | 78 | nlmsgbuf_t *m; |
626 | 78 | nl_target_t t; |
627 | 78 | uint8_t reply[512]; |
628 | 78 | ssize_t r; |
629 | 78 | int ok; |
630 | | |
631 | 78 | if ((m = nlmsg_new(nl->nfc_type, NLM_F_DUMP, 64)) == NULL || |
632 | 78 | nlmsg_set_genl(m, NFC_CMD_GET_TARGET) < 0 || |
633 | 78 | nlmsg_set_u32(m, NFC_ATTR_DEVICE_INDEX, dev) < 0 || |
634 | 78 | nlmsg_tx(nl->fd, m) < 0) { |
635 | 3 | free(m); |
636 | 3 | return (-1); |
637 | 3 | } |
638 | 75 | free(m); |
639 | 75 | if ((r = nlmsg_rx(nl->fd, reply, sizeof(reply), ms)) < 0) { |
640 | 0 | fido_log_debug("%s: nlmsg_rx", __func__); |
641 | 0 | return (-1); |
642 | 0 | } |
643 | 75 | memset(&t, 0, sizeof(t)); |
644 | 75 | t.value = target; |
645 | 75 | if ((ok = nl_parse_reply(reply, (size_t)r, nl->nfc_type, |
646 | 75 | NFC_CMD_GET_TARGET, &t, parse_target)) != 0) { |
647 | 42 | fido_log_debug("%s: nl_parse_reply: %d", __func__, ok); |
648 | 42 | return (-1); |
649 | 42 | } |
650 | 33 | if (!t.found) { |
651 | 24 | fido_log_debug("%s: target not found", __func__); |
652 | 24 | return (-1); |
653 | 24 | } |
654 | | |
655 | 9 | return (0); |
656 | 9 | } |
657 | | |
658 | | static int |
659 | | parse_nfc_event(nlamsgbuf_t *a, void *arg) |
660 | 546 | { |
661 | 546 | nl_poll_t *ctx = arg; |
662 | 546 | uint32_t dev; |
663 | | |
664 | 546 | if (nla_type(a) != NFC_ATTR_DEVICE_INDEX) { |
665 | 254 | fido_log_debug("%s: ignoring nla 0x%x", __func__, nla_type(a)); |
666 | 254 | return (0); |
667 | 254 | } |
668 | 292 | if (nla_get_u32(a, &dev) < 0) { |
669 | 2 | fido_log_debug("%s: dev", __func__); |
670 | 2 | return (-1); |
671 | 2 | } |
672 | 290 | if (dev == ctx->dev) |
673 | 102 | ctx->eventcnt++; |
674 | 188 | else |
675 | 188 | fido_log_debug("%s: ignoring dev 0x%x", __func__, dev); |
676 | | |
677 | 290 | return (0); |
678 | 290 | } |
679 | | |
680 | | int |
681 | | fido_nl_get_nfc_target(fido_nl_t *nl, uint32_t dev, uint32_t *target) |
682 | 600 | { |
683 | 600 | uint8_t reply[512]; |
684 | 600 | nl_poll_t ctx; |
685 | 600 | ssize_t r; |
686 | 600 | int ok; |
687 | | |
688 | 600 | if (nl_nfc_poll(nl, dev) < 0) { |
689 | 109 | fido_log_debug("%s: nl_nfc_poll", __func__); |
690 | 109 | return (-1); |
691 | 109 | } |
692 | | #ifndef FIDO_FUZZ |
693 | | if (setsockopt(nl->fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, |
694 | | &nl->nfc_mcastgrp, sizeof(nl->nfc_mcastgrp)) == -1) { |
695 | | fido_log_error(errno, "%s: setsockopt add", __func__); |
696 | | return (-1); |
697 | | } |
698 | | #endif |
699 | 491 | r = nlmsg_rx(nl->fd, reply, sizeof(reply), NETLINK_POLL_MS); |
700 | | #ifndef FIDO_FUZZ |
701 | | if (setsockopt(nl->fd, SOL_NETLINK, NETLINK_DROP_MEMBERSHIP, |
702 | | &nl->nfc_mcastgrp, sizeof(nl->nfc_mcastgrp)) == -1) { |
703 | | fido_log_error(errno, "%s: setsockopt drop", __func__); |
704 | | return (-1); |
705 | | } |
706 | | #endif |
707 | 491 | if (r < 0) { |
708 | 0 | fido_log_debug("%s: nlmsg_rx", __func__); |
709 | 0 | return (-1); |
710 | 0 | } |
711 | 491 | memset(&ctx, 0, sizeof(ctx)); |
712 | 491 | ctx.dev = dev; |
713 | 491 | if ((ok = nl_parse_reply(reply, (size_t)r, nl->nfc_type, |
714 | 491 | NFC_EVENT_TARGETS_FOUND, &ctx, parse_nfc_event)) != 0) { |
715 | 129 | fido_log_debug("%s: nl_parse_reply: %d", __func__, ok); |
716 | 129 | return (-1); |
717 | 129 | } |
718 | 362 | if (ctx.eventcnt == 0) { |
719 | 284 | fido_log_debug("%s: dev 0x%x not observed", __func__, dev); |
720 | 284 | return (-1); |
721 | 284 | } |
722 | 78 | if (nl_dump_nfc_target(nl, dev, target, -1) < 0) { |
723 | 69 | fido_log_debug("%s: nl_dump_nfc_target", __func__); |
724 | 69 | return (-1); |
725 | 69 | } |
726 | | |
727 | 9 | return (0); |
728 | 9 | } |
729 | | |
730 | | void |
731 | | fido_nl_free(fido_nl_t **nlp) |
732 | 566k | { |
733 | 566k | fido_nl_t *nl; |
734 | | |
735 | 566k | if (nlp == NULL || (nl = *nlp) == NULL) |
736 | 566k | return; |
737 | 566k | if (nl->fd != -1 && close(nl->fd) == -1) |
738 | 0 | fido_log_error(errno, "%s: close", __func__); |
739 | | |
740 | 566k | free(nl); |
741 | 566k | *nlp = NULL; |
742 | 566k | } |
743 | | |
744 | | fido_nl_t * |
745 | | fido_nl_new(void) |
746 | 567k | { |
747 | 567k | fido_nl_t *nl; |
748 | 567k | int ok = -1; |
749 | | |
750 | 567k | if ((nl = calloc(1, sizeof(*nl))) == NULL) |
751 | 567k | return (NULL); |
752 | 566k | if ((nl->fd = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, |
753 | 566k | NETLINK_GENERIC)) == -1) { |
754 | 0 | fido_log_error(errno, "%s: socket", __func__); |
755 | 0 | goto fail; |
756 | 0 | } |
757 | 566k | nl->saddr.nl_family = AF_NETLINK; |
758 | 566k | if (bind(nl->fd, (struct sockaddr *)&nl->saddr, |
759 | 566k | sizeof(nl->saddr)) == -1) { |
760 | 1.37k | fido_log_error(errno, "%s: bind", __func__); |
761 | 1.37k | goto fail; |
762 | 1.37k | } |
763 | 565k | if (nl_get_nfc_family(nl->fd, &nl->nfc_type, &nl->nfc_mcastgrp) < 0) { |
764 | 564k | fido_log_debug("%s: nl_get_nfc_family", __func__); |
765 | 564k | goto fail; |
766 | 564k | } |
767 | | |
768 | 676 | ok = 0; |
769 | 566k | fail: |
770 | 566k | if (ok < 0) |
771 | 565k | fido_nl_free(&nl); |
772 | | |
773 | 566k | return (nl); |
774 | 676 | } |
775 | | |
776 | | #ifdef FIDO_FUZZ |
777 | | void |
778 | | set_netlink_io_functions(ssize_t (*read_f)(int, void *, size_t), |
779 | | ssize_t (*write_f)(int, const void *, size_t)) |
780 | 2.20k | { |
781 | 2.20k | fuzz_read = read_f; |
782 | 2.20k | fuzz_write = write_f; |
783 | 2.20k | } |
784 | | #endif |