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