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a7e3212d LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <endian.h> | |
07630cea | 23 | #include <poll.h> |
a7e3212d LP |
24 | #include <stdlib.h> |
25 | #include <unistd.h> | |
a7e3212d | 26 | |
07630cea | 27 | #include "sd-bus.h" |
24882e06 | 28 | #include "sd-daemon.h" |
07630cea | 29 | |
b5efdb8a | 30 | #include "alloc-util.h" |
07630cea LP |
31 | #include "bus-internal.h" |
32 | #include "bus-message.h" | |
3ffd4af2 LP |
33 | #include "bus-socket.h" |
34 | #include "fd-util.h" | |
07630cea | 35 | #include "formats-util.h" |
15a5e950 | 36 | #include "hexdecoct.h" |
a7e3212d LP |
37 | #include "macro.h" |
38 | #include "missing.h" | |
24882e06 | 39 | #include "signal-util.h" |
15a5e950 | 40 | #include "stdio-util.h" |
07630cea | 41 | #include "string-util.h" |
b1d4f8e1 | 42 | #include "user-util.h" |
07630cea LP |
43 | #include "utf8.h" |
44 | #include "util.h" | |
a7e3212d | 45 | |
aec6d91f LP |
46 | #define SNDBUF_SIZE (8*1024*1024) |
47 | ||
2181a7f5 | 48 | static void iovec_advance(struct iovec iov[], unsigned *idx, size_t size) { |
a7e3212d LP |
49 | |
50 | while (size > 0) { | |
51 | struct iovec *i = iov + *idx; | |
52 | ||
53 | if (i->iov_len > size) { | |
54 | i->iov_base = (uint8_t*) i->iov_base + size; | |
55 | i->iov_len -= size; | |
56 | return; | |
57 | } | |
58 | ||
59 | size -= i->iov_len; | |
60 | ||
61 | i->iov_base = NULL; | |
62 | i->iov_len = 0; | |
63 | ||
64 | (*idx) ++; | |
65 | } | |
66 | } | |
67 | ||
bc7fd8cd | 68 | static int append_iovec(sd_bus_message *m, const void *p, size_t sz) { |
2100fa10 LP |
69 | assert(m); |
70 | assert(p); | |
71 | assert(sz > 0); | |
72 | ||
73 | m->iovec[m->n_iovec].iov_base = (void*) p; | |
74 | m->iovec[m->n_iovec].iov_len = sz; | |
75 | m->n_iovec++; | |
bc7fd8cd LP |
76 | |
77 | return 0; | |
2100fa10 LP |
78 | } |
79 | ||
bc7fd8cd LP |
80 | static int bus_message_setup_iovec(sd_bus_message *m) { |
81 | struct bus_body_part *part; | |
13c299d3 | 82 | unsigned n, i; |
bc7fd8cd LP |
83 | int r; |
84 | ||
2100fa10 LP |
85 | assert(m); |
86 | assert(m->sealed); | |
87 | ||
88 | if (m->n_iovec > 0) | |
bc7fd8cd LP |
89 | return 0; |
90 | ||
91 | assert(!m->iovec); | |
2100fa10 | 92 | |
c91cb83c | 93 | n = 1 + m->n_body_parts; |
bc7fd8cd LP |
94 | if (n < ELEMENTSOF(m->iovec_fixed)) |
95 | m->iovec = m->iovec_fixed; | |
96 | else { | |
97 | m->iovec = new(struct iovec, n); | |
66b26c5c LP |
98 | if (!m->iovec) { |
99 | r = -ENOMEM; | |
100 | goto fail; | |
101 | } | |
bc7fd8cd | 102 | } |
2100fa10 | 103 | |
c91cb83c | 104 | r = append_iovec(m, m->header, BUS_MESSAGE_BODY_BEGIN(m)); |
bc7fd8cd | 105 | if (r < 0) |
66b26c5c | 106 | goto fail; |
2100fa10 | 107 | |
9b29bb68 | 108 | MESSAGE_FOREACH_PART(part, i, m) { |
66b26c5c LP |
109 | r = bus_body_part_map(part); |
110 | if (r < 0) | |
111 | goto fail; | |
112 | ||
bc7fd8cd LP |
113 | r = append_iovec(m, part->data, part->size); |
114 | if (r < 0) | |
66b26c5c | 115 | goto fail; |
bc7fd8cd LP |
116 | } |
117 | ||
118 | assert(n == m->n_iovec); | |
119 | ||
120 | return 0; | |
66b26c5c LP |
121 | |
122 | fail: | |
123 | m->poisoned = true; | |
124 | return r; | |
2100fa10 LP |
125 | } |
126 | ||
2181a7f5 LP |
127 | bool bus_socket_auth_needs_write(sd_bus *b) { |
128 | ||
129 | unsigned i; | |
130 | ||
131 | if (b->auth_index >= ELEMENTSOF(b->auth_iovec)) | |
132 | return false; | |
133 | ||
134 | for (i = b->auth_index; i < ELEMENTSOF(b->auth_iovec); i++) { | |
135 | struct iovec *j = b->auth_iovec + i; | |
136 | ||
137 | if (j->iov_len > 0) | |
138 | return true; | |
139 | } | |
140 | ||
141 | return false; | |
142 | } | |
143 | ||
a7e3212d | 144 | static int bus_socket_write_auth(sd_bus *b) { |
a7e3212d LP |
145 | ssize_t k; |
146 | ||
147 | assert(b); | |
148 | assert(b->state == BUS_AUTHENTICATING); | |
149 | ||
2181a7f5 | 150 | if (!bus_socket_auth_needs_write(b)) |
a7e3212d LP |
151 | return 0; |
152 | ||
15d5af81 LP |
153 | if (b->prefer_writev) |
154 | k = writev(b->output_fd, b->auth_iovec + b->auth_index, ELEMENTSOF(b->auth_iovec) - b->auth_index); | |
155 | else { | |
156 | struct msghdr mh; | |
157 | zero(mh); | |
158 | ||
159 | mh.msg_iov = b->auth_iovec + b->auth_index; | |
160 | mh.msg_iovlen = ELEMENTSOF(b->auth_iovec) - b->auth_index; | |
161 | ||
162 | k = sendmsg(b->output_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); | |
163 | if (k < 0 && errno == ENOTSOCK) { | |
164 | b->prefer_writev = true; | |
165 | k = writev(b->output_fd, b->auth_iovec + b->auth_index, ELEMENTSOF(b->auth_iovec) - b->auth_index); | |
166 | } | |
167 | } | |
a7e3212d | 168 | |
a7e3212d LP |
169 | if (k < 0) |
170 | return errno == EAGAIN ? 0 : -errno; | |
171 | ||
172 | iovec_advance(b->auth_iovec, &b->auth_index, (size_t) k); | |
a7e3212d LP |
173 | return 1; |
174 | } | |
175 | ||
2181a7f5 | 176 | static int bus_socket_auth_verify_client(sd_bus *b) { |
a7e3212d LP |
177 | char *e, *f, *start; |
178 | sd_id128_t peer; | |
179 | unsigned i; | |
180 | int r; | |
181 | ||
2181a7f5 LP |
182 | assert(b); |
183 | ||
a7e3212d LP |
184 | /* We expect two response lines: "OK" and possibly |
185 | * "AGREE_UNIX_FD" */ | |
186 | ||
6e6c21c8 | 187 | e = memmem_safe(b->rbuffer, b->rbuffer_size, "\r\n", 2); |
a7e3212d LP |
188 | if (!e) |
189 | return 0; | |
190 | ||
264ad849 | 191 | if (b->hello_flags & KDBUS_HELLO_ACCEPT_FD) { |
a7e3212d LP |
192 | f = memmem(e + 2, b->rbuffer_size - (e - (char*) b->rbuffer) - 2, "\r\n", 2); |
193 | if (!f) | |
194 | return 0; | |
195 | ||
196 | start = f + 2; | |
197 | } else { | |
198 | f = NULL; | |
199 | start = e + 2; | |
200 | } | |
201 | ||
202 | /* Nice! We got all the lines we need. First check the OK | |
203 | * line */ | |
204 | ||
205 | if (e - (char*) b->rbuffer != 3 + 32) | |
206 | return -EPERM; | |
207 | ||
208 | if (memcmp(b->rbuffer, "OK ", 3)) | |
209 | return -EPERM; | |
210 | ||
2181a7f5 LP |
211 | b->auth = b->anonymous_auth ? BUS_AUTH_ANONYMOUS : BUS_AUTH_EXTERNAL; |
212 | ||
a7e3212d LP |
213 | for (i = 0; i < 32; i += 2) { |
214 | int x, y; | |
215 | ||
216 | x = unhexchar(((char*) b->rbuffer)[3 + i]); | |
217 | y = unhexchar(((char*) b->rbuffer)[3 + i + 1]); | |
218 | ||
219 | if (x < 0 || y < 0) | |
220 | return -EINVAL; | |
221 | ||
222 | peer.bytes[i/2] = ((uint8_t) x << 4 | (uint8_t) y); | |
223 | } | |
224 | ||
98178d39 LP |
225 | if (!sd_id128_equal(b->server_id, SD_ID128_NULL) && |
226 | !sd_id128_equal(b->server_id, peer)) | |
a7e3212d LP |
227 | return -EPERM; |
228 | ||
98178d39 | 229 | b->server_id = peer; |
a7e3212d LP |
230 | |
231 | /* And possibly check the second line, too */ | |
232 | ||
233 | if (f) | |
234 | b->can_fds = | |
f8294e41 JT |
235 | (f - e == strlen("\r\nAGREE_UNIX_FD")) && |
236 | memcmp(e + 2, "AGREE_UNIX_FD", strlen("AGREE_UNIX_FD")) == 0; | |
a7e3212d LP |
237 | |
238 | b->rbuffer_size -= (start - (char*) b->rbuffer); | |
239 | memmove(b->rbuffer, start, b->rbuffer_size); | |
240 | ||
241 | r = bus_start_running(b); | |
242 | if (r < 0) | |
243 | return r; | |
244 | ||
245 | return 1; | |
246 | } | |
247 | ||
2181a7f5 LP |
248 | static bool line_equals(const char *s, size_t m, const char *line) { |
249 | size_t l; | |
250 | ||
251 | l = strlen(line); | |
252 | if (l != m) | |
253 | return false; | |
254 | ||
255 | return memcmp(s, line, l) == 0; | |
256 | } | |
257 | ||
258 | static bool line_begins(const char *s, size_t m, const char *word) { | |
259 | size_t l; | |
260 | ||
261 | l = strlen(word); | |
262 | if (m < l) | |
263 | return false; | |
264 | ||
265 | if (memcmp(s, word, l) != 0) | |
266 | return false; | |
267 | ||
268 | return m == l || (m > l && s[l] == ' '); | |
269 | } | |
270 | ||
271 | static int verify_anonymous_token(sd_bus *b, const char *p, size_t l) { | |
272 | _cleanup_free_ char *token = NULL; | |
30494563 TG |
273 | size_t len; |
274 | int r; | |
2181a7f5 LP |
275 | |
276 | if (!b->anonymous_auth) | |
277 | return 0; | |
278 | ||
279 | if (l <= 0) | |
280 | return 1; | |
281 | ||
282 | assert(p[0] == ' '); | |
283 | p++; l--; | |
284 | ||
285 | if (l % 2 != 0) | |
286 | return 0; | |
2181a7f5 | 287 | |
30494563 TG |
288 | r = unhexmem(p, l, (void **) &token, &len); |
289 | if (r < 0) | |
290 | return 0; | |
291 | ||
292 | if (memchr(token, 0, len)) | |
2181a7f5 LP |
293 | return 0; |
294 | ||
295 | return !!utf8_is_valid(token); | |
296 | } | |
297 | ||
298 | static int verify_external_token(sd_bus *b, const char *p, size_t l) { | |
299 | _cleanup_free_ char *token = NULL; | |
30494563 | 300 | size_t len; |
2181a7f5 LP |
301 | uid_t u; |
302 | int r; | |
303 | ||
304 | /* We don't do any real authentication here. Instead, we if | |
305 | * the owner of this bus wanted authentication he should have | |
306 | * checked SO_PEERCRED before even creating the bus object. */ | |
307 | ||
8411d2a2 | 308 | if (!b->anonymous_auth && !b->ucred_valid) |
2181a7f5 LP |
309 | return 0; |
310 | ||
311 | if (l <= 0) | |
312 | return 1; | |
313 | ||
314 | assert(p[0] == ' '); | |
315 | p++; l--; | |
316 | ||
317 | if (l % 2 != 0) | |
318 | return 0; | |
319 | ||
30494563 TG |
320 | r = unhexmem(p, l, (void**) &token, &len); |
321 | if (r < 0) | |
322 | return 0; | |
2181a7f5 | 323 | |
30494563 | 324 | if (memchr(token, 0, len)) |
2181a7f5 LP |
325 | return 0; |
326 | ||
327 | r = parse_uid(token, &u); | |
328 | if (r < 0) | |
329 | return 0; | |
330 | ||
8411d2a2 LP |
331 | /* We ignore the passed value if anonymous authentication is |
332 | * on anyway. */ | |
333 | if (!b->anonymous_auth && u != b->ucred.uid) | |
2181a7f5 LP |
334 | return 0; |
335 | ||
336 | return 1; | |
337 | } | |
338 | ||
339 | static int bus_socket_auth_write(sd_bus *b, const char *t) { | |
340 | char *p; | |
341 | size_t l; | |
342 | ||
343 | assert(b); | |
344 | assert(t); | |
345 | ||
346 | /* We only make use of the first iovec */ | |
347 | assert(b->auth_index == 0 || b->auth_index == 1); | |
348 | ||
349 | l = strlen(t); | |
350 | p = malloc(b->auth_iovec[0].iov_len + l); | |
351 | if (!p) | |
352 | return -ENOMEM; | |
353 | ||
354 | memcpy(p, b->auth_iovec[0].iov_base, b->auth_iovec[0].iov_len); | |
355 | memcpy(p + b->auth_iovec[0].iov_len, t, l); | |
356 | ||
357 | b->auth_iovec[0].iov_base = p; | |
358 | b->auth_iovec[0].iov_len += l; | |
359 | ||
360 | free(b->auth_buffer); | |
361 | b->auth_buffer = p; | |
362 | b->auth_index = 0; | |
363 | return 0; | |
364 | } | |
365 | ||
366 | static int bus_socket_auth_write_ok(sd_bus *b) { | |
367 | char t[3 + 32 + 2 + 1]; | |
368 | ||
369 | assert(b); | |
370 | ||
5ffa8c81 | 371 | xsprintf(t, "OK " SD_ID128_FORMAT_STR "\r\n", SD_ID128_FORMAT_VAL(b->server_id)); |
2181a7f5 LP |
372 | |
373 | return bus_socket_auth_write(b, t); | |
374 | } | |
375 | ||
376 | static int bus_socket_auth_verify_server(sd_bus *b) { | |
377 | char *e; | |
378 | const char *line; | |
379 | size_t l; | |
380 | bool processed = false; | |
381 | int r; | |
382 | ||
383 | assert(b); | |
384 | ||
2b4ac889 | 385 | if (b->rbuffer_size < 1) |
2181a7f5 LP |
386 | return 0; |
387 | ||
388 | /* First char must be a NUL byte */ | |
389 | if (*(char*) b->rbuffer != 0) | |
390 | return -EIO; | |
391 | ||
2b4ac889 LP |
392 | if (b->rbuffer_size < 3) |
393 | return 0; | |
394 | ||
2181a7f5 LP |
395 | /* Begin with the first line */ |
396 | if (b->auth_rbegin <= 0) | |
397 | b->auth_rbegin = 1; | |
398 | ||
399 | for (;;) { | |
400 | /* Check if line is complete */ | |
401 | line = (char*) b->rbuffer + b->auth_rbegin; | |
402 | e = memmem(line, b->rbuffer_size - b->auth_rbegin, "\r\n", 2); | |
403 | if (!e) | |
404 | return processed; | |
405 | ||
406 | l = e - line; | |
407 | ||
408 | if (line_begins(line, l, "AUTH ANONYMOUS")) { | |
409 | ||
410 | r = verify_anonymous_token(b, line + 14, l - 14); | |
411 | if (r < 0) | |
412 | return r; | |
413 | if (r == 0) | |
414 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
415 | else { | |
416 | b->auth = BUS_AUTH_ANONYMOUS; | |
417 | r = bus_socket_auth_write_ok(b); | |
418 | } | |
419 | ||
420 | } else if (line_begins(line, l, "AUTH EXTERNAL")) { | |
421 | ||
422 | r = verify_external_token(b, line + 13, l - 13); | |
423 | if (r < 0) | |
424 | return r; | |
425 | if (r == 0) | |
426 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
427 | else { | |
428 | b->auth = BUS_AUTH_EXTERNAL; | |
429 | r = bus_socket_auth_write_ok(b); | |
430 | } | |
431 | ||
432 | } else if (line_begins(line, l, "AUTH")) | |
433 | r = bus_socket_auth_write(b, "REJECTED EXTERNAL ANONYMOUS\r\n"); | |
434 | else if (line_equals(line, l, "CANCEL") || | |
435 | line_begins(line, l, "ERROR")) { | |
436 | ||
437 | b->auth = _BUS_AUTH_INVALID; | |
438 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
439 | ||
440 | } else if (line_equals(line, l, "BEGIN")) { | |
441 | ||
442 | if (b->auth == _BUS_AUTH_INVALID) | |
443 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
444 | else { | |
445 | /* We can't leave from the auth phase | |
446 | * before we haven't written | |
447 | * everything queued, so let's check | |
448 | * that */ | |
449 | ||
450 | if (bus_socket_auth_needs_write(b)) | |
451 | return 1; | |
452 | ||
453 | b->rbuffer_size -= (e + 2 - (char*) b->rbuffer); | |
454 | memmove(b->rbuffer, e + 2, b->rbuffer_size); | |
455 | return bus_start_running(b); | |
456 | } | |
457 | ||
458 | } else if (line_begins(line, l, "DATA")) { | |
459 | ||
460 | if (b->auth == _BUS_AUTH_INVALID) | |
461 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
462 | else { | |
463 | if (b->auth == BUS_AUTH_ANONYMOUS) | |
464 | r = verify_anonymous_token(b, line + 4, l - 4); | |
465 | else | |
466 | r = verify_external_token(b, line + 4, l - 4); | |
467 | ||
468 | if (r < 0) | |
469 | return r; | |
470 | if (r == 0) { | |
471 | b->auth = _BUS_AUTH_INVALID; | |
472 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
473 | } else | |
474 | r = bus_socket_auth_write_ok(b); | |
475 | } | |
476 | } else if (line_equals(line, l, "NEGOTIATE_UNIX_FD")) { | |
264ad849 | 477 | if (b->auth == _BUS_AUTH_INVALID || !(b->hello_flags & KDBUS_HELLO_ACCEPT_FD)) |
2181a7f5 LP |
478 | r = bus_socket_auth_write(b, "ERROR\r\n"); |
479 | else { | |
480 | b->can_fds = true; | |
481 | r = bus_socket_auth_write(b, "AGREE_UNIX_FD\r\n"); | |
482 | } | |
483 | } else | |
484 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
485 | ||
486 | if (r < 0) | |
487 | return r; | |
488 | ||
489 | b->auth_rbegin = e + 2 - (char*) b->rbuffer; | |
490 | ||
491 | processed = true; | |
492 | } | |
493 | } | |
494 | ||
495 | static int bus_socket_auth_verify(sd_bus *b) { | |
496 | assert(b); | |
497 | ||
498 | if (b->is_server) | |
499 | return bus_socket_auth_verify_server(b); | |
500 | else | |
501 | return bus_socket_auth_verify_client(b); | |
502 | } | |
503 | ||
a7e3212d LP |
504 | static int bus_socket_read_auth(sd_bus *b) { |
505 | struct msghdr mh; | |
7f4e6a1c | 506 | struct iovec iov = {}; |
a7e3212d LP |
507 | size_t n; |
508 | ssize_t k; | |
509 | int r; | |
510 | void *p; | |
2181a7f5 LP |
511 | union { |
512 | struct cmsghdr cmsghdr; | |
d868f2a3 | 513 | uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)]; |
2181a7f5 | 514 | } control; |
15d5af81 | 515 | bool handle_cmsg = false; |
a7e3212d LP |
516 | |
517 | assert(b); | |
2181a7f5 | 518 | assert(b->state == BUS_AUTHENTICATING); |
a7e3212d LP |
519 | |
520 | r = bus_socket_auth_verify(b); | |
521 | if (r != 0) | |
522 | return r; | |
523 | ||
9607d947 | 524 | n = MAX(256u, b->rbuffer_size * 2); |
a7e3212d LP |
525 | |
526 | if (n > BUS_AUTH_SIZE_MAX) | |
527 | n = BUS_AUTH_SIZE_MAX; | |
528 | ||
529 | if (b->rbuffer_size >= n) | |
530 | return -ENOBUFS; | |
531 | ||
532 | p = realloc(b->rbuffer, n); | |
533 | if (!p) | |
534 | return -ENOMEM; | |
535 | ||
536 | b->rbuffer = p; | |
537 | ||
a7e3212d LP |
538 | iov.iov_base = (uint8_t*) b->rbuffer + b->rbuffer_size; |
539 | iov.iov_len = n - b->rbuffer_size; | |
540 | ||
15d5af81 LP |
541 | if (b->prefer_readv) |
542 | k = readv(b->input_fd, &iov, 1); | |
543 | else { | |
544 | zero(mh); | |
545 | mh.msg_iov = &iov; | |
546 | mh.msg_iovlen = 1; | |
547 | mh.msg_control = &control; | |
548 | mh.msg_controllen = sizeof(control); | |
549 | ||
550 | k = recvmsg(b->input_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC); | |
551 | if (k < 0 && errno == ENOTSOCK) { | |
552 | b->prefer_readv = true; | |
553 | k = readv(b->input_fd, &iov, 1); | |
554 | } else | |
555 | handle_cmsg = true; | |
556 | } | |
a7e3212d LP |
557 | if (k < 0) |
558 | return errno == EAGAIN ? 0 : -errno; | |
559 | if (k == 0) | |
560 | return -ECONNRESET; | |
561 | ||
562 | b->rbuffer_size += k; | |
563 | ||
2a1288ff LP |
564 | if (handle_cmsg) { |
565 | struct cmsghdr *cmsg; | |
566 | ||
567 | CMSG_FOREACH(cmsg, &mh) | |
15d5af81 LP |
568 | if (cmsg->cmsg_level == SOL_SOCKET && |
569 | cmsg->cmsg_type == SCM_RIGHTS) { | |
570 | int j; | |
571 | ||
572 | /* Whut? We received fds during the auth | |
573 | * protocol? Somebody is playing games with | |
574 | * us. Close them all, and fail */ | |
575 | j = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); | |
576 | close_many((int*) CMSG_DATA(cmsg), j); | |
577 | return -EIO; | |
d868f2a3 ZJS |
578 | } else |
579 | log_debug("Got unexpected auxiliary data with level=%d and type=%d", | |
580 | cmsg->cmsg_level, cmsg->cmsg_type); | |
2a1288ff | 581 | } |
2181a7f5 | 582 | |
a7e3212d LP |
583 | r = bus_socket_auth_verify(b); |
584 | if (r != 0) | |
585 | return r; | |
586 | ||
587 | return 1; | |
588 | } | |
589 | ||
8f04d2eb | 590 | void bus_socket_setup(sd_bus *b) { |
a7e3212d LP |
591 | assert(b); |
592 | ||
aec6d91f LP |
593 | /* Increase the buffers to 8 MB */ |
594 | fd_inc_rcvbuf(b->input_fd, SNDBUF_SIZE); | |
595 | fd_inc_sndbuf(b->output_fd, SNDBUF_SIZE); | |
a7e3212d | 596 | |
e1d337d4 LP |
597 | b->is_kernel = false; |
598 | b->message_version = 1; | |
0f437184 | 599 | b->message_endian = 0; |
8f04d2eb | 600 | } |
e1d337d4 | 601 | |
8f04d2eb | 602 | static void bus_get_peercred(sd_bus *b) { |
c4e6556c ZJS |
603 | int r; |
604 | ||
8f04d2eb LP |
605 | assert(b); |
606 | ||
607 | /* Get the peer for socketpair() sockets */ | |
eff05270 | 608 | b->ucred_valid = getpeercred(b->input_fd, &b->ucred) >= 0; |
c4e6556c ZJS |
609 | |
610 | /* Get the SELinux context of the peer */ | |
611 | r = getpeersec(b->input_fd, &b->label); | |
612 | if (r < 0 && r != -EOPNOTSUPP) | |
613 | log_debug_errno(r, "Failed to determine peer security context: %m"); | |
a7e3212d LP |
614 | } |
615 | ||
2181a7f5 | 616 | static int bus_socket_start_auth_client(sd_bus *b) { |
a7e3212d | 617 | size_t l; |
2181a7f5 | 618 | const char *auth_suffix, *auth_prefix; |
a7e3212d LP |
619 | |
620 | assert(b); | |
621 | ||
2181a7f5 LP |
622 | if (b->anonymous_auth) { |
623 | auth_prefix = "\0AUTH ANONYMOUS "; | |
a7e3212d | 624 | |
2181a7f5 LP |
625 | /* For ANONYMOUS auth we send some arbitrary "trace" string */ |
626 | l = 9; | |
627 | b->auth_buffer = hexmem("anonymous", l); | |
628 | } else { | |
5ffa8c81 | 629 | char text[DECIMAL_STR_MAX(uid_t) + 1]; |
a7e3212d | 630 | |
2181a7f5 | 631 | auth_prefix = "\0AUTH EXTERNAL "; |
a7e3212d | 632 | |
5ffa8c81 | 633 | xsprintf(text, UID_FMT, geteuid()); |
a7e3212d | 634 | |
2181a7f5 LP |
635 | l = strlen(text); |
636 | b->auth_buffer = hexmem(text, l); | |
637 | } | |
638 | ||
639 | if (!b->auth_buffer) | |
a7e3212d LP |
640 | return -ENOMEM; |
641 | ||
264ad849 | 642 | if (b->hello_flags & KDBUS_HELLO_ACCEPT_FD) |
2181a7f5 LP |
643 | auth_suffix = "\r\nNEGOTIATE_UNIX_FD\r\nBEGIN\r\n"; |
644 | else | |
645 | auth_suffix = "\r\nBEGIN\r\n"; | |
a7e3212d LP |
646 | |
647 | b->auth_iovec[0].iov_base = (void*) auth_prefix; | |
2181a7f5 LP |
648 | b->auth_iovec[0].iov_len = 1 + strlen(auth_prefix + 1); |
649 | b->auth_iovec[1].iov_base = (void*) b->auth_buffer; | |
a7e3212d LP |
650 | b->auth_iovec[1].iov_len = l * 2; |
651 | b->auth_iovec[2].iov_base = (void*) auth_suffix; | |
652 | b->auth_iovec[2].iov_len = strlen(auth_suffix); | |
a7e3212d LP |
653 | |
654 | return bus_socket_write_auth(b); | |
655 | } | |
656 | ||
a7893c6b | 657 | int bus_socket_start_auth(sd_bus *b) { |
2181a7f5 LP |
658 | assert(b); |
659 | ||
8f04d2eb LP |
660 | bus_get_peercred(b); |
661 | ||
2181a7f5 LP |
662 | b->state = BUS_AUTHENTICATING; |
663 | b->auth_timeout = now(CLOCK_MONOTONIC) + BUS_DEFAULT_TIMEOUT; | |
664 | ||
9ab32f9d | 665 | if (sd_is_socket(b->input_fd, AF_UNIX, 0, 0) <= 0) |
264ad849 | 666 | b->hello_flags &= ~KDBUS_HELLO_ACCEPT_FD; |
2181a7f5 | 667 | |
9ab32f9d LP |
668 | if (b->output_fd != b->input_fd) |
669 | if (sd_is_socket(b->output_fd, AF_UNIX, 0, 0) <= 0) | |
264ad849 | 670 | b->hello_flags &= ~KDBUS_HELLO_ACCEPT_FD; |
e82c9509 | 671 | |
2181a7f5 LP |
672 | if (b->is_server) |
673 | return bus_socket_read_auth(b); | |
674 | else | |
675 | return bus_socket_start_auth_client(b); | |
676 | } | |
677 | ||
a7e3212d LP |
678 | int bus_socket_connect(sd_bus *b) { |
679 | int r; | |
680 | ||
681 | assert(b); | |
e82c9509 LP |
682 | assert(b->input_fd < 0); |
683 | assert(b->output_fd < 0); | |
a7e3212d LP |
684 | assert(b->sockaddr.sa.sa_family != AF_UNSPEC); |
685 | ||
e82c9509 LP |
686 | b->input_fd = socket(b->sockaddr.sa.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
687 | if (b->input_fd < 0) | |
a7e3212d LP |
688 | return -errno; |
689 | ||
e82c9509 LP |
690 | b->output_fd = b->input_fd; |
691 | ||
8f04d2eb | 692 | bus_socket_setup(b); |
a7e3212d | 693 | |
e82c9509 | 694 | r = connect(b->input_fd, &b->sockaddr.sa, b->sockaddr_size); |
a7e3212d LP |
695 | if (r < 0) { |
696 | if (errno == EINPROGRESS) | |
697 | return 1; | |
698 | ||
699 | return -errno; | |
700 | } | |
701 | ||
702 | return bus_socket_start_auth(b); | |
703 | } | |
704 | ||
705 | int bus_socket_exec(sd_bus *b) { | |
e82c9509 | 706 | int s[2], r; |
a7e3212d LP |
707 | pid_t pid; |
708 | ||
709 | assert(b); | |
e82c9509 LP |
710 | assert(b->input_fd < 0); |
711 | assert(b->output_fd < 0); | |
a7e3212d LP |
712 | assert(b->exec_path); |
713 | ||
e82c9509 LP |
714 | r = socketpair(AF_UNIX, SOCK_STREAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0, s); |
715 | if (r < 0) | |
a7e3212d LP |
716 | return -errno; |
717 | ||
718 | pid = fork(); | |
719 | if (pid < 0) { | |
3d94f76c | 720 | safe_close_pair(s); |
a7e3212d LP |
721 | return -errno; |
722 | } | |
723 | if (pid == 0) { | |
724 | /* Child */ | |
725 | ||
ce30c8dc LP |
726 | (void) reset_all_signal_handlers(); |
727 | (void) reset_signal_mask(); | |
e82c9509 LP |
728 | |
729 | close_all_fds(s+1, 1); | |
a7e3212d LP |
730 | |
731 | assert_se(dup3(s[1], STDIN_FILENO, 0) == STDIN_FILENO); | |
732 | assert_se(dup3(s[1], STDOUT_FILENO, 0) == STDOUT_FILENO); | |
733 | ||
734 | if (s[1] != STDIN_FILENO && s[1] != STDOUT_FILENO) | |
03e334a1 | 735 | safe_close(s[1]); |
a7e3212d LP |
736 | |
737 | fd_cloexec(STDIN_FILENO, false); | |
738 | fd_cloexec(STDOUT_FILENO, false); | |
739 | fd_nonblock(STDIN_FILENO, false); | |
740 | fd_nonblock(STDOUT_FILENO, false); | |
741 | ||
742 | if (b->exec_argv) | |
743 | execvp(b->exec_path, b->exec_argv); | |
744 | else { | |
745 | const char *argv[] = { b->exec_path, NULL }; | |
746 | execvp(b->exec_path, (char**) argv); | |
747 | } | |
748 | ||
749 | _exit(EXIT_FAILURE); | |
750 | } | |
751 | ||
03e334a1 | 752 | safe_close(s[1]); |
e82c9509 | 753 | b->output_fd = b->input_fd = s[0]; |
a7e3212d | 754 | |
8f04d2eb | 755 | bus_socket_setup(b); |
e1d337d4 | 756 | |
a7e3212d LP |
757 | return bus_socket_start_auth(b); |
758 | } | |
759 | ||
760 | int bus_socket_take_fd(sd_bus *b) { | |
a7e3212d LP |
761 | assert(b); |
762 | ||
8f04d2eb | 763 | bus_socket_setup(b); |
a7e3212d LP |
764 | |
765 | return bus_socket_start_auth(b); | |
766 | } | |
767 | ||
768 | int bus_socket_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx) { | |
a7e3212d LP |
769 | struct iovec *iov; |
770 | ssize_t k; | |
771 | size_t n; | |
772 | unsigned j; | |
bc7fd8cd | 773 | int r; |
a7e3212d LP |
774 | |
775 | assert(bus); | |
776 | assert(m); | |
777 | assert(idx); | |
778 | assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); | |
779 | ||
6629161f | 780 | if (*idx >= BUS_MESSAGE_SIZE(m)) |
a7e3212d | 781 | return 0; |
a7e3212d | 782 | |
bc7fd8cd LP |
783 | r = bus_message_setup_iovec(m); |
784 | if (r < 0) | |
785 | return r; | |
2100fa10 | 786 | |
a7e3212d LP |
787 | n = m->n_iovec * sizeof(struct iovec); |
788 | iov = alloca(n); | |
789 | memcpy(iov, m->iovec, n); | |
790 | ||
791 | j = 0; | |
792 | iovec_advance(iov, &j, *idx); | |
793 | ||
15d5af81 LP |
794 | if (bus->prefer_writev) |
795 | k = writev(bus->output_fd, iov, m->n_iovec); | |
796 | else { | |
7f4e6a1c ZJS |
797 | struct msghdr mh = { |
798 | .msg_iov = iov, | |
799 | .msg_iovlen = m->n_iovec, | |
800 | }; | |
15d5af81 LP |
801 | |
802 | if (m->n_fds > 0) { | |
803 | struct cmsghdr *control; | |
15d5af81 | 804 | |
7f4e6a1c ZJS |
805 | mh.msg_control = control = alloca(CMSG_SPACE(sizeof(int) * m->n_fds)); |
806 | mh.msg_controllen = control->cmsg_len = CMSG_LEN(sizeof(int) * m->n_fds); | |
15d5af81 LP |
807 | control->cmsg_level = SOL_SOCKET; |
808 | control->cmsg_type = SCM_RIGHTS; | |
15d5af81 LP |
809 | memcpy(CMSG_DATA(control), m->fds, sizeof(int) * m->n_fds); |
810 | } | |
811 | ||
15d5af81 LP |
812 | k = sendmsg(bus->output_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); |
813 | if (k < 0 && errno == ENOTSOCK) { | |
814 | bus->prefer_writev = true; | |
815 | k = writev(bus->output_fd, iov, m->n_iovec); | |
816 | } | |
817 | } | |
a7e3212d | 818 | |
a7e3212d LP |
819 | if (k < 0) |
820 | return errno == EAGAIN ? 0 : -errno; | |
821 | ||
822 | *idx += (size_t) k; | |
823 | return 1; | |
824 | } | |
825 | ||
826 | static int bus_socket_read_message_need(sd_bus *bus, size_t *need) { | |
827 | uint32_t a, b; | |
828 | uint8_t e; | |
829 | uint64_t sum; | |
830 | ||
831 | assert(bus); | |
832 | assert(need); | |
833 | assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); | |
834 | ||
835 | if (bus->rbuffer_size < sizeof(struct bus_header)) { | |
836 | *need = sizeof(struct bus_header) + 8; | |
837 | ||
838 | /* Minimum message size: | |
839 | * | |
840 | * Header + | |
841 | * | |
842 | * Method Call: +2 string headers | |
843 | * Signal: +3 string headers | |
844 | * Method Error: +1 string headers | |
845 | * +1 uint32 headers | |
846 | * Method Reply: +1 uint32 headers | |
847 | * | |
848 | * A string header is at least 9 bytes | |
849 | * A uint32 header is at least 8 bytes | |
850 | * | |
851 | * Hence the minimum message size of a valid message | |
852 | * is header + 8 bytes */ | |
853 | ||
854 | return 0; | |
855 | } | |
856 | ||
857 | a = ((const uint32_t*) bus->rbuffer)[1]; | |
858 | b = ((const uint32_t*) bus->rbuffer)[3]; | |
859 | ||
860 | e = ((const uint8_t*) bus->rbuffer)[0]; | |
0461f8cd | 861 | if (e == BUS_LITTLE_ENDIAN) { |
a7e3212d LP |
862 | a = le32toh(a); |
863 | b = le32toh(b); | |
0461f8cd | 864 | } else if (e == BUS_BIG_ENDIAN) { |
a7e3212d LP |
865 | a = be32toh(a); |
866 | b = be32toh(b); | |
867 | } else | |
868 | return -EBADMSG; | |
869 | ||
870 | sum = (uint64_t) sizeof(struct bus_header) + (uint64_t) ALIGN_TO(b, 8) + (uint64_t) a; | |
871 | if (sum >= BUS_MESSAGE_SIZE_MAX) | |
872 | return -ENOBUFS; | |
873 | ||
874 | *need = (size_t) sum; | |
875 | return 0; | |
876 | } | |
877 | ||
7d22c717 | 878 | static int bus_socket_make_message(sd_bus *bus, size_t size) { |
a7e3212d LP |
879 | sd_bus_message *t; |
880 | void *b; | |
881 | int r; | |
882 | ||
883 | assert(bus); | |
a7e3212d LP |
884 | assert(bus->rbuffer_size >= size); |
885 | assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); | |
886 | ||
7adc46fc LP |
887 | r = bus_rqueue_make_room(bus); |
888 | if (r < 0) | |
889 | return r; | |
890 | ||
a7e3212d LP |
891 | if (bus->rbuffer_size > size) { |
892 | b = memdup((const uint8_t*) bus->rbuffer + size, | |
893 | bus->rbuffer_size - size); | |
894 | if (!b) | |
895 | return -ENOMEM; | |
896 | } else | |
897 | b = NULL; | |
898 | ||
df2d202e LP |
899 | r = bus_message_from_malloc(bus, |
900 | bus->rbuffer, size, | |
a7e3212d | 901 | bus->fds, bus->n_fds, |
038f9863 | 902 | NULL, |
a7e3212d LP |
903 | &t); |
904 | if (r < 0) { | |
905 | free(b); | |
906 | return r; | |
907 | } | |
908 | ||
909 | bus->rbuffer = b; | |
910 | bus->rbuffer_size -= size; | |
911 | ||
912 | bus->fds = NULL; | |
913 | bus->n_fds = 0; | |
914 | ||
7adc46fc | 915 | bus->rqueue[bus->rqueue_size++] = t; |
7d22c717 | 916 | |
a7e3212d LP |
917 | return 1; |
918 | } | |
919 | ||
7d22c717 | 920 | int bus_socket_read_message(sd_bus *bus) { |
a7e3212d | 921 | struct msghdr mh; |
7f4e6a1c | 922 | struct iovec iov = {}; |
a7e3212d LP |
923 | ssize_t k; |
924 | size_t need; | |
925 | int r; | |
926 | void *b; | |
927 | union { | |
928 | struct cmsghdr cmsghdr; | |
d868f2a3 | 929 | uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)]; |
a7e3212d | 930 | } control; |
4d3a5b10 | 931 | bool handle_cmsg = false; |
a7e3212d LP |
932 | |
933 | assert(bus); | |
a7e3212d LP |
934 | assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); |
935 | ||
936 | r = bus_socket_read_message_need(bus, &need); | |
937 | if (r < 0) | |
938 | return r; | |
939 | ||
940 | if (bus->rbuffer_size >= need) | |
7d22c717 | 941 | return bus_socket_make_message(bus, need); |
a7e3212d LP |
942 | |
943 | b = realloc(bus->rbuffer, need); | |
944 | if (!b) | |
945 | return -ENOMEM; | |
946 | ||
947 | bus->rbuffer = b; | |
948 | ||
a7e3212d LP |
949 | iov.iov_base = (uint8_t*) bus->rbuffer + bus->rbuffer_size; |
950 | iov.iov_len = need - bus->rbuffer_size; | |
951 | ||
15d5af81 LP |
952 | if (bus->prefer_readv) |
953 | k = readv(bus->input_fd, &iov, 1); | |
954 | else { | |
955 | zero(mh); | |
956 | mh.msg_iov = &iov; | |
957 | mh.msg_iovlen = 1; | |
958 | mh.msg_control = &control; | |
959 | mh.msg_controllen = sizeof(control); | |
960 | ||
961 | k = recvmsg(bus->input_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC); | |
962 | if (k < 0 && errno == ENOTSOCK) { | |
963 | bus->prefer_readv = true; | |
964 | k = readv(bus->input_fd, &iov, 1); | |
965 | } else | |
966 | handle_cmsg = true; | |
967 | } | |
a7e3212d LP |
968 | if (k < 0) |
969 | return errno == EAGAIN ? 0 : -errno; | |
970 | if (k == 0) | |
971 | return -ECONNRESET; | |
972 | ||
973 | bus->rbuffer_size += k; | |
974 | ||
2a1288ff LP |
975 | if (handle_cmsg) { |
976 | struct cmsghdr *cmsg; | |
977 | ||
978 | CMSG_FOREACH(cmsg, &mh) | |
15d5af81 LP |
979 | if (cmsg->cmsg_level == SOL_SOCKET && |
980 | cmsg->cmsg_type == SCM_RIGHTS) { | |
981 | int n, *f; | |
982 | ||
983 | n = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); | |
984 | ||
985 | if (!bus->can_fds) { | |
986 | /* Whut? We received fds but this | |
987 | * isn't actually enabled? Close them, | |
988 | * and fail */ | |
989 | ||
990 | close_many((int*) CMSG_DATA(cmsg), n); | |
991 | return -EIO; | |
992 | } | |
993 | ||
a0f5ab70 | 994 | f = realloc(bus->fds, sizeof(int) * (bus->n_fds + n)); |
15d5af81 LP |
995 | if (!f) { |
996 | close_many((int*) CMSG_DATA(cmsg), n); | |
997 | return -ENOMEM; | |
998 | } | |
999 | ||
1000 | memcpy(f + bus->n_fds, CMSG_DATA(cmsg), n * sizeof(int)); | |
1001 | bus->fds = f; | |
1002 | bus->n_fds += n; | |
d868f2a3 ZJS |
1003 | } else |
1004 | log_debug("Got unexpected auxiliary data with level=%d and type=%d", | |
1005 | cmsg->cmsg_level, cmsg->cmsg_type); | |
2a1288ff | 1006 | } |
a7e3212d LP |
1007 | |
1008 | r = bus_socket_read_message_need(bus, &need); | |
1009 | if (r < 0) | |
1010 | return r; | |
1011 | ||
1012 | if (bus->rbuffer_size >= need) | |
7d22c717 | 1013 | return bus_socket_make_message(bus, need); |
a7e3212d LP |
1014 | |
1015 | return 1; | |
1016 | } | |
1017 | ||
1018 | int bus_socket_process_opening(sd_bus *b) { | |
1019 | int error = 0; | |
1020 | socklen_t slen = sizeof(error); | |
b92bea5d ZJS |
1021 | struct pollfd p = { |
1022 | .fd = b->output_fd, | |
1023 | .events = POLLOUT, | |
1024 | }; | |
a7e3212d LP |
1025 | int r; |
1026 | ||
a7e3212d LP |
1027 | assert(b->state == BUS_OPENING); |
1028 | ||
a7e3212d LP |
1029 | r = poll(&p, 1, 0); |
1030 | if (r < 0) | |
1031 | return -errno; | |
1032 | ||
1033 | if (!(p.revents & (POLLOUT|POLLERR|POLLHUP))) | |
1034 | return 0; | |
1035 | ||
e82c9509 | 1036 | r = getsockopt(b->output_fd, SOL_SOCKET, SO_ERROR, &error, &slen); |
a7e3212d LP |
1037 | if (r < 0) |
1038 | b->last_connect_error = errno; | |
1039 | else if (error != 0) | |
1040 | b->last_connect_error = error; | |
1041 | else if (p.revents & (POLLERR|POLLHUP)) | |
1042 | b->last_connect_error = ECONNREFUSED; | |
1043 | else | |
1044 | return bus_socket_start_auth(b); | |
1045 | ||
1046 | return bus_next_address(b); | |
1047 | } | |
1048 | ||
1049 | int bus_socket_process_authenticating(sd_bus *b) { | |
1050 | int r; | |
1051 | ||
1052 | assert(b); | |
1053 | assert(b->state == BUS_AUTHENTICATING); | |
1054 | ||
1055 | if (now(CLOCK_MONOTONIC) >= b->auth_timeout) | |
1056 | return -ETIMEDOUT; | |
1057 | ||
1058 | r = bus_socket_write_auth(b); | |
1059 | if (r != 0) | |
1060 | return r; | |
1061 | ||
1062 | return bus_socket_read_auth(b); | |
1063 | } |