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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" | |
e4e73a63 | 37 | #include "hexdecoct.h" |
24882e06 | 38 | #include "signal-util.h" |
07630cea | 39 | #include "string-util.h" |
b1d4f8e1 | 40 | #include "user-util.h" |
07630cea LP |
41 | #include "utf8.h" |
42 | #include "util.h" | |
a7e3212d | 43 | |
aec6d91f LP |
44 | #define SNDBUF_SIZE (8*1024*1024) |
45 | ||
2181a7f5 | 46 | static void iovec_advance(struct iovec iov[], unsigned *idx, size_t size) { |
a7e3212d LP |
47 | |
48 | while (size > 0) { | |
49 | struct iovec *i = iov + *idx; | |
50 | ||
51 | if (i->iov_len > size) { | |
52 | i->iov_base = (uint8_t*) i->iov_base + size; | |
53 | i->iov_len -= size; | |
54 | return; | |
55 | } | |
56 | ||
57 | size -= i->iov_len; | |
58 | ||
59 | i->iov_base = NULL; | |
60 | i->iov_len = 0; | |
61 | ||
62 | (*idx) ++; | |
63 | } | |
64 | } | |
65 | ||
bc7fd8cd | 66 | static int append_iovec(sd_bus_message *m, const void *p, size_t sz) { |
2100fa10 LP |
67 | assert(m); |
68 | assert(p); | |
69 | assert(sz > 0); | |
70 | ||
71 | m->iovec[m->n_iovec].iov_base = (void*) p; | |
72 | m->iovec[m->n_iovec].iov_len = sz; | |
73 | m->n_iovec++; | |
bc7fd8cd LP |
74 | |
75 | return 0; | |
2100fa10 LP |
76 | } |
77 | ||
bc7fd8cd LP |
78 | static int bus_message_setup_iovec(sd_bus_message *m) { |
79 | struct bus_body_part *part; | |
13c299d3 | 80 | unsigned n, i; |
bc7fd8cd LP |
81 | int r; |
82 | ||
2100fa10 LP |
83 | assert(m); |
84 | assert(m->sealed); | |
85 | ||
86 | if (m->n_iovec > 0) | |
bc7fd8cd LP |
87 | return 0; |
88 | ||
89 | assert(!m->iovec); | |
2100fa10 | 90 | |
c91cb83c | 91 | n = 1 + m->n_body_parts; |
bc7fd8cd LP |
92 | if (n < ELEMENTSOF(m->iovec_fixed)) |
93 | m->iovec = m->iovec_fixed; | |
94 | else { | |
95 | m->iovec = new(struct iovec, n); | |
66b26c5c LP |
96 | if (!m->iovec) { |
97 | r = -ENOMEM; | |
98 | goto fail; | |
99 | } | |
bc7fd8cd | 100 | } |
2100fa10 | 101 | |
c91cb83c | 102 | r = append_iovec(m, m->header, BUS_MESSAGE_BODY_BEGIN(m)); |
bc7fd8cd | 103 | if (r < 0) |
66b26c5c | 104 | goto fail; |
2100fa10 | 105 | |
9b29bb68 | 106 | MESSAGE_FOREACH_PART(part, i, m) { |
66b26c5c LP |
107 | r = bus_body_part_map(part); |
108 | if (r < 0) | |
109 | goto fail; | |
110 | ||
bc7fd8cd LP |
111 | r = append_iovec(m, part->data, part->size); |
112 | if (r < 0) | |
66b26c5c | 113 | goto fail; |
bc7fd8cd LP |
114 | } |
115 | ||
116 | assert(n == m->n_iovec); | |
117 | ||
118 | return 0; | |
66b26c5c LP |
119 | |
120 | fail: | |
121 | m->poisoned = true; | |
122 | return r; | |
2100fa10 LP |
123 | } |
124 | ||
2181a7f5 LP |
125 | bool bus_socket_auth_needs_write(sd_bus *b) { |
126 | ||
127 | unsigned i; | |
128 | ||
129 | if (b->auth_index >= ELEMENTSOF(b->auth_iovec)) | |
130 | return false; | |
131 | ||
132 | for (i = b->auth_index; i < ELEMENTSOF(b->auth_iovec); i++) { | |
133 | struct iovec *j = b->auth_iovec + i; | |
134 | ||
135 | if (j->iov_len > 0) | |
136 | return true; | |
137 | } | |
138 | ||
139 | return false; | |
140 | } | |
141 | ||
a7e3212d | 142 | static int bus_socket_write_auth(sd_bus *b) { |
a7e3212d LP |
143 | ssize_t k; |
144 | ||
145 | assert(b); | |
146 | assert(b->state == BUS_AUTHENTICATING); | |
147 | ||
2181a7f5 | 148 | if (!bus_socket_auth_needs_write(b)) |
a7e3212d LP |
149 | return 0; |
150 | ||
15d5af81 LP |
151 | if (b->prefer_writev) |
152 | k = writev(b->output_fd, b->auth_iovec + b->auth_index, ELEMENTSOF(b->auth_iovec) - b->auth_index); | |
153 | else { | |
154 | struct msghdr mh; | |
155 | zero(mh); | |
156 | ||
157 | mh.msg_iov = b->auth_iovec + b->auth_index; | |
158 | mh.msg_iovlen = ELEMENTSOF(b->auth_iovec) - b->auth_index; | |
159 | ||
160 | k = sendmsg(b->output_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); | |
161 | if (k < 0 && errno == ENOTSOCK) { | |
162 | b->prefer_writev = true; | |
163 | k = writev(b->output_fd, b->auth_iovec + b->auth_index, ELEMENTSOF(b->auth_iovec) - b->auth_index); | |
164 | } | |
165 | } | |
a7e3212d | 166 | |
a7e3212d LP |
167 | if (k < 0) |
168 | return errno == EAGAIN ? 0 : -errno; | |
169 | ||
170 | iovec_advance(b->auth_iovec, &b->auth_index, (size_t) k); | |
a7e3212d LP |
171 | return 1; |
172 | } | |
173 | ||
2181a7f5 | 174 | static int bus_socket_auth_verify_client(sd_bus *b) { |
a7e3212d LP |
175 | char *e, *f, *start; |
176 | sd_id128_t peer; | |
177 | unsigned i; | |
178 | int r; | |
179 | ||
2181a7f5 LP |
180 | assert(b); |
181 | ||
a7e3212d LP |
182 | /* We expect two response lines: "OK" and possibly |
183 | * "AGREE_UNIX_FD" */ | |
184 | ||
6e6c21c8 | 185 | e = memmem_safe(b->rbuffer, b->rbuffer_size, "\r\n", 2); |
a7e3212d LP |
186 | if (!e) |
187 | return 0; | |
188 | ||
264ad849 | 189 | if (b->hello_flags & KDBUS_HELLO_ACCEPT_FD) { |
a7e3212d LP |
190 | f = memmem(e + 2, b->rbuffer_size - (e - (char*) b->rbuffer) - 2, "\r\n", 2); |
191 | if (!f) | |
192 | return 0; | |
193 | ||
194 | start = f + 2; | |
195 | } else { | |
196 | f = NULL; | |
197 | start = e + 2; | |
198 | } | |
199 | ||
200 | /* Nice! We got all the lines we need. First check the OK | |
201 | * line */ | |
202 | ||
203 | if (e - (char*) b->rbuffer != 3 + 32) | |
204 | return -EPERM; | |
205 | ||
206 | if (memcmp(b->rbuffer, "OK ", 3)) | |
207 | return -EPERM; | |
208 | ||
2181a7f5 LP |
209 | b->auth = b->anonymous_auth ? BUS_AUTH_ANONYMOUS : BUS_AUTH_EXTERNAL; |
210 | ||
a7e3212d LP |
211 | for (i = 0; i < 32; i += 2) { |
212 | int x, y; | |
213 | ||
214 | x = unhexchar(((char*) b->rbuffer)[3 + i]); | |
215 | y = unhexchar(((char*) b->rbuffer)[3 + i + 1]); | |
216 | ||
217 | if (x < 0 || y < 0) | |
218 | return -EINVAL; | |
219 | ||
220 | peer.bytes[i/2] = ((uint8_t) x << 4 | (uint8_t) y); | |
221 | } | |
222 | ||
98178d39 LP |
223 | if (!sd_id128_equal(b->server_id, SD_ID128_NULL) && |
224 | !sd_id128_equal(b->server_id, peer)) | |
a7e3212d LP |
225 | return -EPERM; |
226 | ||
98178d39 | 227 | b->server_id = peer; |
a7e3212d LP |
228 | |
229 | /* And possibly check the second line, too */ | |
230 | ||
231 | if (f) | |
232 | b->can_fds = | |
f8294e41 JT |
233 | (f - e == strlen("\r\nAGREE_UNIX_FD")) && |
234 | memcmp(e + 2, "AGREE_UNIX_FD", strlen("AGREE_UNIX_FD")) == 0; | |
a7e3212d LP |
235 | |
236 | b->rbuffer_size -= (start - (char*) b->rbuffer); | |
237 | memmove(b->rbuffer, start, b->rbuffer_size); | |
238 | ||
239 | r = bus_start_running(b); | |
240 | if (r < 0) | |
241 | return r; | |
242 | ||
243 | return 1; | |
244 | } | |
245 | ||
2181a7f5 LP |
246 | static bool line_equals(const char *s, size_t m, const char *line) { |
247 | size_t l; | |
248 | ||
249 | l = strlen(line); | |
250 | if (l != m) | |
251 | return false; | |
252 | ||
253 | return memcmp(s, line, l) == 0; | |
254 | } | |
255 | ||
256 | static bool line_begins(const char *s, size_t m, const char *word) { | |
257 | size_t l; | |
258 | ||
259 | l = strlen(word); | |
260 | if (m < l) | |
261 | return false; | |
262 | ||
263 | if (memcmp(s, word, l) != 0) | |
264 | return false; | |
265 | ||
266 | return m == l || (m > l && s[l] == ' '); | |
267 | } | |
268 | ||
269 | static int verify_anonymous_token(sd_bus *b, const char *p, size_t l) { | |
270 | _cleanup_free_ char *token = NULL; | |
30494563 TG |
271 | size_t len; |
272 | int r; | |
2181a7f5 LP |
273 | |
274 | if (!b->anonymous_auth) | |
275 | return 0; | |
276 | ||
277 | if (l <= 0) | |
278 | return 1; | |
279 | ||
280 | assert(p[0] == ' '); | |
281 | p++; l--; | |
282 | ||
283 | if (l % 2 != 0) | |
284 | return 0; | |
2181a7f5 | 285 | |
30494563 TG |
286 | r = unhexmem(p, l, (void **) &token, &len); |
287 | if (r < 0) | |
288 | return 0; | |
289 | ||
290 | if (memchr(token, 0, len)) | |
2181a7f5 LP |
291 | return 0; |
292 | ||
293 | return !!utf8_is_valid(token); | |
294 | } | |
295 | ||
296 | static int verify_external_token(sd_bus *b, const char *p, size_t l) { | |
297 | _cleanup_free_ char *token = NULL; | |
30494563 | 298 | size_t len; |
2181a7f5 LP |
299 | uid_t u; |
300 | int r; | |
301 | ||
302 | /* We don't do any real authentication here. Instead, we if | |
303 | * the owner of this bus wanted authentication he should have | |
304 | * checked SO_PEERCRED before even creating the bus object. */ | |
305 | ||
8411d2a2 | 306 | if (!b->anonymous_auth && !b->ucred_valid) |
2181a7f5 LP |
307 | return 0; |
308 | ||
309 | if (l <= 0) | |
310 | return 1; | |
311 | ||
312 | assert(p[0] == ' '); | |
313 | p++; l--; | |
314 | ||
315 | if (l % 2 != 0) | |
316 | return 0; | |
317 | ||
30494563 TG |
318 | r = unhexmem(p, l, (void**) &token, &len); |
319 | if (r < 0) | |
320 | return 0; | |
2181a7f5 | 321 | |
30494563 | 322 | if (memchr(token, 0, len)) |
2181a7f5 LP |
323 | return 0; |
324 | ||
325 | r = parse_uid(token, &u); | |
326 | if (r < 0) | |
327 | return 0; | |
328 | ||
8411d2a2 LP |
329 | /* We ignore the passed value if anonymous authentication is |
330 | * on anyway. */ | |
331 | if (!b->anonymous_auth && u != b->ucred.uid) | |
2181a7f5 LP |
332 | return 0; |
333 | ||
334 | return 1; | |
335 | } | |
336 | ||
337 | static int bus_socket_auth_write(sd_bus *b, const char *t) { | |
338 | char *p; | |
339 | size_t l; | |
340 | ||
341 | assert(b); | |
342 | assert(t); | |
343 | ||
344 | /* We only make use of the first iovec */ | |
345 | assert(b->auth_index == 0 || b->auth_index == 1); | |
346 | ||
347 | l = strlen(t); | |
348 | p = malloc(b->auth_iovec[0].iov_len + l); | |
349 | if (!p) | |
350 | return -ENOMEM; | |
351 | ||
352 | memcpy(p, b->auth_iovec[0].iov_base, b->auth_iovec[0].iov_len); | |
353 | memcpy(p + b->auth_iovec[0].iov_len, t, l); | |
354 | ||
355 | b->auth_iovec[0].iov_base = p; | |
356 | b->auth_iovec[0].iov_len += l; | |
357 | ||
358 | free(b->auth_buffer); | |
359 | b->auth_buffer = p; | |
360 | b->auth_index = 0; | |
361 | return 0; | |
362 | } | |
363 | ||
364 | static int bus_socket_auth_write_ok(sd_bus *b) { | |
365 | char t[3 + 32 + 2 + 1]; | |
366 | ||
367 | assert(b); | |
368 | ||
5ffa8c81 | 369 | xsprintf(t, "OK " SD_ID128_FORMAT_STR "\r\n", SD_ID128_FORMAT_VAL(b->server_id)); |
2181a7f5 LP |
370 | |
371 | return bus_socket_auth_write(b, t); | |
372 | } | |
373 | ||
374 | static int bus_socket_auth_verify_server(sd_bus *b) { | |
375 | char *e; | |
376 | const char *line; | |
377 | size_t l; | |
378 | bool processed = false; | |
379 | int r; | |
380 | ||
381 | assert(b); | |
382 | ||
2b4ac889 | 383 | if (b->rbuffer_size < 1) |
2181a7f5 LP |
384 | return 0; |
385 | ||
386 | /* First char must be a NUL byte */ | |
387 | if (*(char*) b->rbuffer != 0) | |
388 | return -EIO; | |
389 | ||
2b4ac889 LP |
390 | if (b->rbuffer_size < 3) |
391 | return 0; | |
392 | ||
2181a7f5 LP |
393 | /* Begin with the first line */ |
394 | if (b->auth_rbegin <= 0) | |
395 | b->auth_rbegin = 1; | |
396 | ||
397 | for (;;) { | |
398 | /* Check if line is complete */ | |
399 | line = (char*) b->rbuffer + b->auth_rbegin; | |
400 | e = memmem(line, b->rbuffer_size - b->auth_rbegin, "\r\n", 2); | |
401 | if (!e) | |
402 | return processed; | |
403 | ||
404 | l = e - line; | |
405 | ||
406 | if (line_begins(line, l, "AUTH ANONYMOUS")) { | |
407 | ||
408 | r = verify_anonymous_token(b, line + 14, l - 14); | |
409 | if (r < 0) | |
410 | return r; | |
411 | if (r == 0) | |
412 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
413 | else { | |
414 | b->auth = BUS_AUTH_ANONYMOUS; | |
415 | r = bus_socket_auth_write_ok(b); | |
416 | } | |
417 | ||
418 | } else if (line_begins(line, l, "AUTH EXTERNAL")) { | |
419 | ||
420 | r = verify_external_token(b, line + 13, l - 13); | |
421 | if (r < 0) | |
422 | return r; | |
423 | if (r == 0) | |
424 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
425 | else { | |
426 | b->auth = BUS_AUTH_EXTERNAL; | |
427 | r = bus_socket_auth_write_ok(b); | |
428 | } | |
429 | ||
430 | } else if (line_begins(line, l, "AUTH")) | |
431 | r = bus_socket_auth_write(b, "REJECTED EXTERNAL ANONYMOUS\r\n"); | |
432 | else if (line_equals(line, l, "CANCEL") || | |
433 | line_begins(line, l, "ERROR")) { | |
434 | ||
435 | b->auth = _BUS_AUTH_INVALID; | |
436 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
437 | ||
438 | } else if (line_equals(line, l, "BEGIN")) { | |
439 | ||
440 | if (b->auth == _BUS_AUTH_INVALID) | |
441 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
442 | else { | |
443 | /* We can't leave from the auth phase | |
444 | * before we haven't written | |
445 | * everything queued, so let's check | |
446 | * that */ | |
447 | ||
448 | if (bus_socket_auth_needs_write(b)) | |
449 | return 1; | |
450 | ||
451 | b->rbuffer_size -= (e + 2 - (char*) b->rbuffer); | |
452 | memmove(b->rbuffer, e + 2, b->rbuffer_size); | |
453 | return bus_start_running(b); | |
454 | } | |
455 | ||
456 | } else if (line_begins(line, l, "DATA")) { | |
457 | ||
458 | if (b->auth == _BUS_AUTH_INVALID) | |
459 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
460 | else { | |
461 | if (b->auth == BUS_AUTH_ANONYMOUS) | |
462 | r = verify_anonymous_token(b, line + 4, l - 4); | |
463 | else | |
464 | r = verify_external_token(b, line + 4, l - 4); | |
465 | ||
466 | if (r < 0) | |
467 | return r; | |
468 | if (r == 0) { | |
469 | b->auth = _BUS_AUTH_INVALID; | |
470 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
471 | } else | |
472 | r = bus_socket_auth_write_ok(b); | |
473 | } | |
474 | } else if (line_equals(line, l, "NEGOTIATE_UNIX_FD")) { | |
264ad849 | 475 | if (b->auth == _BUS_AUTH_INVALID || !(b->hello_flags & KDBUS_HELLO_ACCEPT_FD)) |
2181a7f5 LP |
476 | r = bus_socket_auth_write(b, "ERROR\r\n"); |
477 | else { | |
478 | b->can_fds = true; | |
479 | r = bus_socket_auth_write(b, "AGREE_UNIX_FD\r\n"); | |
480 | } | |
481 | } else | |
482 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
483 | ||
484 | if (r < 0) | |
485 | return r; | |
486 | ||
487 | b->auth_rbegin = e + 2 - (char*) b->rbuffer; | |
488 | ||
489 | processed = true; | |
490 | } | |
491 | } | |
492 | ||
493 | static int bus_socket_auth_verify(sd_bus *b) { | |
494 | assert(b); | |
495 | ||
496 | if (b->is_server) | |
497 | return bus_socket_auth_verify_server(b); | |
498 | else | |
499 | return bus_socket_auth_verify_client(b); | |
500 | } | |
501 | ||
a7e3212d LP |
502 | static int bus_socket_read_auth(sd_bus *b) { |
503 | struct msghdr mh; | |
7f4e6a1c | 504 | struct iovec iov = {}; |
a7e3212d LP |
505 | size_t n; |
506 | ssize_t k; | |
507 | int r; | |
508 | void *p; | |
2181a7f5 LP |
509 | union { |
510 | struct cmsghdr cmsghdr; | |
d868f2a3 | 511 | uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)]; |
2181a7f5 | 512 | } control; |
15d5af81 | 513 | bool handle_cmsg = false; |
a7e3212d LP |
514 | |
515 | assert(b); | |
2181a7f5 | 516 | assert(b->state == BUS_AUTHENTICATING); |
a7e3212d LP |
517 | |
518 | r = bus_socket_auth_verify(b); | |
519 | if (r != 0) | |
520 | return r; | |
521 | ||
9607d947 | 522 | n = MAX(256u, b->rbuffer_size * 2); |
a7e3212d LP |
523 | |
524 | if (n > BUS_AUTH_SIZE_MAX) | |
525 | n = BUS_AUTH_SIZE_MAX; | |
526 | ||
527 | if (b->rbuffer_size >= n) | |
528 | return -ENOBUFS; | |
529 | ||
530 | p = realloc(b->rbuffer, n); | |
531 | if (!p) | |
532 | return -ENOMEM; | |
533 | ||
534 | b->rbuffer = p; | |
535 | ||
a7e3212d LP |
536 | iov.iov_base = (uint8_t*) b->rbuffer + b->rbuffer_size; |
537 | iov.iov_len = n - b->rbuffer_size; | |
538 | ||
15d5af81 LP |
539 | if (b->prefer_readv) |
540 | k = readv(b->input_fd, &iov, 1); | |
541 | else { | |
542 | zero(mh); | |
543 | mh.msg_iov = &iov; | |
544 | mh.msg_iovlen = 1; | |
545 | mh.msg_control = &control; | |
546 | mh.msg_controllen = sizeof(control); | |
547 | ||
548 | k = recvmsg(b->input_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC); | |
549 | if (k < 0 && errno == ENOTSOCK) { | |
550 | b->prefer_readv = true; | |
551 | k = readv(b->input_fd, &iov, 1); | |
552 | } else | |
553 | handle_cmsg = true; | |
554 | } | |
a7e3212d LP |
555 | if (k < 0) |
556 | return errno == EAGAIN ? 0 : -errno; | |
557 | if (k == 0) | |
558 | return -ECONNRESET; | |
559 | ||
560 | b->rbuffer_size += k; | |
561 | ||
2a1288ff LP |
562 | if (handle_cmsg) { |
563 | struct cmsghdr *cmsg; | |
564 | ||
565 | CMSG_FOREACH(cmsg, &mh) | |
15d5af81 LP |
566 | if (cmsg->cmsg_level == SOL_SOCKET && |
567 | cmsg->cmsg_type == SCM_RIGHTS) { | |
568 | int j; | |
569 | ||
570 | /* Whut? We received fds during the auth | |
571 | * protocol? Somebody is playing games with | |
572 | * us. Close them all, and fail */ | |
573 | j = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); | |
574 | close_many((int*) CMSG_DATA(cmsg), j); | |
575 | return -EIO; | |
d868f2a3 ZJS |
576 | } else |
577 | log_debug("Got unexpected auxiliary data with level=%d and type=%d", | |
578 | cmsg->cmsg_level, cmsg->cmsg_type); | |
2a1288ff | 579 | } |
2181a7f5 | 580 | |
a7e3212d LP |
581 | r = bus_socket_auth_verify(b); |
582 | if (r != 0) | |
583 | return r; | |
584 | ||
585 | return 1; | |
586 | } | |
587 | ||
8f04d2eb | 588 | void bus_socket_setup(sd_bus *b) { |
a7e3212d LP |
589 | assert(b); |
590 | ||
aec6d91f LP |
591 | /* Increase the buffers to 8 MB */ |
592 | fd_inc_rcvbuf(b->input_fd, SNDBUF_SIZE); | |
593 | fd_inc_sndbuf(b->output_fd, SNDBUF_SIZE); | |
a7e3212d | 594 | |
e1d337d4 LP |
595 | b->is_kernel = false; |
596 | b->message_version = 1; | |
0f437184 | 597 | b->message_endian = 0; |
8f04d2eb | 598 | } |
e1d337d4 | 599 | |
8f04d2eb | 600 | static void bus_get_peercred(sd_bus *b) { |
c4e6556c ZJS |
601 | int r; |
602 | ||
8f04d2eb LP |
603 | assert(b); |
604 | ||
605 | /* Get the peer for socketpair() sockets */ | |
eff05270 | 606 | b->ucred_valid = getpeercred(b->input_fd, &b->ucred) >= 0; |
c4e6556c ZJS |
607 | |
608 | /* Get the SELinux context of the peer */ | |
609 | r = getpeersec(b->input_fd, &b->label); | |
610 | if (r < 0 && r != -EOPNOTSUPP) | |
611 | log_debug_errno(r, "Failed to determine peer security context: %m"); | |
a7e3212d LP |
612 | } |
613 | ||
2181a7f5 | 614 | static int bus_socket_start_auth_client(sd_bus *b) { |
a7e3212d | 615 | size_t l; |
2181a7f5 | 616 | const char *auth_suffix, *auth_prefix; |
a7e3212d LP |
617 | |
618 | assert(b); | |
619 | ||
2181a7f5 LP |
620 | if (b->anonymous_auth) { |
621 | auth_prefix = "\0AUTH ANONYMOUS "; | |
a7e3212d | 622 | |
2181a7f5 LP |
623 | /* For ANONYMOUS auth we send some arbitrary "trace" string */ |
624 | l = 9; | |
625 | b->auth_buffer = hexmem("anonymous", l); | |
626 | } else { | |
5ffa8c81 | 627 | char text[DECIMAL_STR_MAX(uid_t) + 1]; |
a7e3212d | 628 | |
2181a7f5 | 629 | auth_prefix = "\0AUTH EXTERNAL "; |
a7e3212d | 630 | |
5ffa8c81 | 631 | xsprintf(text, UID_FMT, geteuid()); |
a7e3212d | 632 | |
2181a7f5 LP |
633 | l = strlen(text); |
634 | b->auth_buffer = hexmem(text, l); | |
635 | } | |
636 | ||
637 | if (!b->auth_buffer) | |
a7e3212d LP |
638 | return -ENOMEM; |
639 | ||
264ad849 | 640 | if (b->hello_flags & KDBUS_HELLO_ACCEPT_FD) |
2181a7f5 LP |
641 | auth_suffix = "\r\nNEGOTIATE_UNIX_FD\r\nBEGIN\r\n"; |
642 | else | |
643 | auth_suffix = "\r\nBEGIN\r\n"; | |
a7e3212d LP |
644 | |
645 | b->auth_iovec[0].iov_base = (void*) auth_prefix; | |
2181a7f5 LP |
646 | b->auth_iovec[0].iov_len = 1 + strlen(auth_prefix + 1); |
647 | b->auth_iovec[1].iov_base = (void*) b->auth_buffer; | |
a7e3212d LP |
648 | b->auth_iovec[1].iov_len = l * 2; |
649 | b->auth_iovec[2].iov_base = (void*) auth_suffix; | |
650 | b->auth_iovec[2].iov_len = strlen(auth_suffix); | |
a7e3212d LP |
651 | |
652 | return bus_socket_write_auth(b); | |
653 | } | |
654 | ||
a7893c6b | 655 | int bus_socket_start_auth(sd_bus *b) { |
2181a7f5 LP |
656 | assert(b); |
657 | ||
8f04d2eb LP |
658 | bus_get_peercred(b); |
659 | ||
2181a7f5 LP |
660 | b->state = BUS_AUTHENTICATING; |
661 | b->auth_timeout = now(CLOCK_MONOTONIC) + BUS_DEFAULT_TIMEOUT; | |
662 | ||
9ab32f9d | 663 | if (sd_is_socket(b->input_fd, AF_UNIX, 0, 0) <= 0) |
264ad849 | 664 | b->hello_flags &= ~KDBUS_HELLO_ACCEPT_FD; |
2181a7f5 | 665 | |
9ab32f9d LP |
666 | if (b->output_fd != b->input_fd) |
667 | if (sd_is_socket(b->output_fd, AF_UNIX, 0, 0) <= 0) | |
264ad849 | 668 | b->hello_flags &= ~KDBUS_HELLO_ACCEPT_FD; |
e82c9509 | 669 | |
2181a7f5 LP |
670 | if (b->is_server) |
671 | return bus_socket_read_auth(b); | |
672 | else | |
673 | return bus_socket_start_auth_client(b); | |
674 | } | |
675 | ||
a7e3212d LP |
676 | int bus_socket_connect(sd_bus *b) { |
677 | int r; | |
678 | ||
679 | assert(b); | |
e82c9509 LP |
680 | assert(b->input_fd < 0); |
681 | assert(b->output_fd < 0); | |
a7e3212d LP |
682 | assert(b->sockaddr.sa.sa_family != AF_UNSPEC); |
683 | ||
e82c9509 LP |
684 | b->input_fd = socket(b->sockaddr.sa.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
685 | if (b->input_fd < 0) | |
a7e3212d LP |
686 | return -errno; |
687 | ||
e82c9509 LP |
688 | b->output_fd = b->input_fd; |
689 | ||
8f04d2eb | 690 | bus_socket_setup(b); |
a7e3212d | 691 | |
e82c9509 | 692 | r = connect(b->input_fd, &b->sockaddr.sa, b->sockaddr_size); |
a7e3212d LP |
693 | if (r < 0) { |
694 | if (errno == EINPROGRESS) | |
695 | return 1; | |
696 | ||
697 | return -errno; | |
698 | } | |
699 | ||
700 | return bus_socket_start_auth(b); | |
701 | } | |
702 | ||
703 | int bus_socket_exec(sd_bus *b) { | |
e82c9509 | 704 | int s[2], r; |
a7e3212d LP |
705 | pid_t pid; |
706 | ||
707 | assert(b); | |
e82c9509 LP |
708 | assert(b->input_fd < 0); |
709 | assert(b->output_fd < 0); | |
a7e3212d LP |
710 | assert(b->exec_path); |
711 | ||
e82c9509 LP |
712 | r = socketpair(AF_UNIX, SOCK_STREAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0, s); |
713 | if (r < 0) | |
a7e3212d LP |
714 | return -errno; |
715 | ||
716 | pid = fork(); | |
717 | if (pid < 0) { | |
3d94f76c | 718 | safe_close_pair(s); |
a7e3212d LP |
719 | return -errno; |
720 | } | |
721 | if (pid == 0) { | |
722 | /* Child */ | |
723 | ||
ce30c8dc LP |
724 | (void) reset_all_signal_handlers(); |
725 | (void) reset_signal_mask(); | |
e82c9509 LP |
726 | |
727 | close_all_fds(s+1, 1); | |
a7e3212d LP |
728 | |
729 | assert_se(dup3(s[1], STDIN_FILENO, 0) == STDIN_FILENO); | |
730 | assert_se(dup3(s[1], STDOUT_FILENO, 0) == STDOUT_FILENO); | |
731 | ||
732 | if (s[1] != STDIN_FILENO && s[1] != STDOUT_FILENO) | |
03e334a1 | 733 | safe_close(s[1]); |
a7e3212d LP |
734 | |
735 | fd_cloexec(STDIN_FILENO, false); | |
736 | fd_cloexec(STDOUT_FILENO, false); | |
737 | fd_nonblock(STDIN_FILENO, false); | |
738 | fd_nonblock(STDOUT_FILENO, false); | |
739 | ||
740 | if (b->exec_argv) | |
741 | execvp(b->exec_path, b->exec_argv); | |
742 | else { | |
743 | const char *argv[] = { b->exec_path, NULL }; | |
744 | execvp(b->exec_path, (char**) argv); | |
745 | } | |
746 | ||
747 | _exit(EXIT_FAILURE); | |
748 | } | |
749 | ||
03e334a1 | 750 | safe_close(s[1]); |
e82c9509 | 751 | b->output_fd = b->input_fd = s[0]; |
a7e3212d | 752 | |
8f04d2eb | 753 | bus_socket_setup(b); |
e1d337d4 | 754 | |
a7e3212d LP |
755 | return bus_socket_start_auth(b); |
756 | } | |
757 | ||
758 | int bus_socket_take_fd(sd_bus *b) { | |
a7e3212d LP |
759 | assert(b); |
760 | ||
8f04d2eb | 761 | bus_socket_setup(b); |
a7e3212d LP |
762 | |
763 | return bus_socket_start_auth(b); | |
764 | } | |
765 | ||
766 | int bus_socket_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx) { | |
a7e3212d LP |
767 | struct iovec *iov; |
768 | ssize_t k; | |
769 | size_t n; | |
770 | unsigned j; | |
bc7fd8cd | 771 | int r; |
a7e3212d LP |
772 | |
773 | assert(bus); | |
774 | assert(m); | |
775 | assert(idx); | |
776 | assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); | |
777 | ||
6629161f | 778 | if (*idx >= BUS_MESSAGE_SIZE(m)) |
a7e3212d | 779 | return 0; |
a7e3212d | 780 | |
bc7fd8cd LP |
781 | r = bus_message_setup_iovec(m); |
782 | if (r < 0) | |
783 | return r; | |
2100fa10 | 784 | |
a7e3212d LP |
785 | n = m->n_iovec * sizeof(struct iovec); |
786 | iov = alloca(n); | |
787 | memcpy(iov, m->iovec, n); | |
788 | ||
789 | j = 0; | |
790 | iovec_advance(iov, &j, *idx); | |
791 | ||
15d5af81 LP |
792 | if (bus->prefer_writev) |
793 | k = writev(bus->output_fd, iov, m->n_iovec); | |
794 | else { | |
7f4e6a1c ZJS |
795 | struct msghdr mh = { |
796 | .msg_iov = iov, | |
797 | .msg_iovlen = m->n_iovec, | |
798 | }; | |
15d5af81 LP |
799 | |
800 | if (m->n_fds > 0) { | |
801 | struct cmsghdr *control; | |
15d5af81 | 802 | |
7f4e6a1c ZJS |
803 | mh.msg_control = control = alloca(CMSG_SPACE(sizeof(int) * m->n_fds)); |
804 | mh.msg_controllen = control->cmsg_len = CMSG_LEN(sizeof(int) * m->n_fds); | |
15d5af81 LP |
805 | control->cmsg_level = SOL_SOCKET; |
806 | control->cmsg_type = SCM_RIGHTS; | |
15d5af81 LP |
807 | memcpy(CMSG_DATA(control), m->fds, sizeof(int) * m->n_fds); |
808 | } | |
809 | ||
15d5af81 LP |
810 | k = sendmsg(bus->output_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); |
811 | if (k < 0 && errno == ENOTSOCK) { | |
812 | bus->prefer_writev = true; | |
813 | k = writev(bus->output_fd, iov, m->n_iovec); | |
814 | } | |
815 | } | |
a7e3212d | 816 | |
a7e3212d LP |
817 | if (k < 0) |
818 | return errno == EAGAIN ? 0 : -errno; | |
819 | ||
820 | *idx += (size_t) k; | |
821 | return 1; | |
822 | } | |
823 | ||
824 | static int bus_socket_read_message_need(sd_bus *bus, size_t *need) { | |
825 | uint32_t a, b; | |
826 | uint8_t e; | |
827 | uint64_t sum; | |
828 | ||
829 | assert(bus); | |
830 | assert(need); | |
831 | assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); | |
832 | ||
833 | if (bus->rbuffer_size < sizeof(struct bus_header)) { | |
834 | *need = sizeof(struct bus_header) + 8; | |
835 | ||
836 | /* Minimum message size: | |
837 | * | |
838 | * Header + | |
839 | * | |
840 | * Method Call: +2 string headers | |
841 | * Signal: +3 string headers | |
842 | * Method Error: +1 string headers | |
843 | * +1 uint32 headers | |
844 | * Method Reply: +1 uint32 headers | |
845 | * | |
846 | * A string header is at least 9 bytes | |
847 | * A uint32 header is at least 8 bytes | |
848 | * | |
849 | * Hence the minimum message size of a valid message | |
850 | * is header + 8 bytes */ | |
851 | ||
852 | return 0; | |
853 | } | |
854 | ||
855 | a = ((const uint32_t*) bus->rbuffer)[1]; | |
856 | b = ((const uint32_t*) bus->rbuffer)[3]; | |
857 | ||
858 | e = ((const uint8_t*) bus->rbuffer)[0]; | |
0461f8cd | 859 | if (e == BUS_LITTLE_ENDIAN) { |
a7e3212d LP |
860 | a = le32toh(a); |
861 | b = le32toh(b); | |
0461f8cd | 862 | } else if (e == BUS_BIG_ENDIAN) { |
a7e3212d LP |
863 | a = be32toh(a); |
864 | b = be32toh(b); | |
865 | } else | |
866 | return -EBADMSG; | |
867 | ||
868 | sum = (uint64_t) sizeof(struct bus_header) + (uint64_t) ALIGN_TO(b, 8) + (uint64_t) a; | |
869 | if (sum >= BUS_MESSAGE_SIZE_MAX) | |
870 | return -ENOBUFS; | |
871 | ||
872 | *need = (size_t) sum; | |
873 | return 0; | |
874 | } | |
875 | ||
7d22c717 | 876 | static int bus_socket_make_message(sd_bus *bus, size_t size) { |
a7e3212d LP |
877 | sd_bus_message *t; |
878 | void *b; | |
879 | int r; | |
880 | ||
881 | assert(bus); | |
a7e3212d LP |
882 | assert(bus->rbuffer_size >= size); |
883 | assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); | |
884 | ||
7adc46fc LP |
885 | r = bus_rqueue_make_room(bus); |
886 | if (r < 0) | |
887 | return r; | |
888 | ||
a7e3212d LP |
889 | if (bus->rbuffer_size > size) { |
890 | b = memdup((const uint8_t*) bus->rbuffer + size, | |
891 | bus->rbuffer_size - size); | |
892 | if (!b) | |
893 | return -ENOMEM; | |
894 | } else | |
895 | b = NULL; | |
896 | ||
df2d202e LP |
897 | r = bus_message_from_malloc(bus, |
898 | bus->rbuffer, size, | |
a7e3212d | 899 | bus->fds, bus->n_fds, |
038f9863 | 900 | NULL, |
a7e3212d LP |
901 | &t); |
902 | if (r < 0) { | |
903 | free(b); | |
904 | return r; | |
905 | } | |
906 | ||
907 | bus->rbuffer = b; | |
908 | bus->rbuffer_size -= size; | |
909 | ||
910 | bus->fds = NULL; | |
911 | bus->n_fds = 0; | |
912 | ||
7adc46fc | 913 | bus->rqueue[bus->rqueue_size++] = t; |
7d22c717 | 914 | |
a7e3212d LP |
915 | return 1; |
916 | } | |
917 | ||
7d22c717 | 918 | int bus_socket_read_message(sd_bus *bus) { |
a7e3212d | 919 | struct msghdr mh; |
7f4e6a1c | 920 | struct iovec iov = {}; |
a7e3212d LP |
921 | ssize_t k; |
922 | size_t need; | |
923 | int r; | |
924 | void *b; | |
925 | union { | |
926 | struct cmsghdr cmsghdr; | |
d868f2a3 | 927 | uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)]; |
a7e3212d | 928 | } control; |
4d3a5b10 | 929 | bool handle_cmsg = false; |
a7e3212d LP |
930 | |
931 | assert(bus); | |
a7e3212d LP |
932 | assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); |
933 | ||
934 | r = bus_socket_read_message_need(bus, &need); | |
935 | if (r < 0) | |
936 | return r; | |
937 | ||
938 | if (bus->rbuffer_size >= need) | |
7d22c717 | 939 | return bus_socket_make_message(bus, need); |
a7e3212d LP |
940 | |
941 | b = realloc(bus->rbuffer, need); | |
942 | if (!b) | |
943 | return -ENOMEM; | |
944 | ||
945 | bus->rbuffer = b; | |
946 | ||
a7e3212d LP |
947 | iov.iov_base = (uint8_t*) bus->rbuffer + bus->rbuffer_size; |
948 | iov.iov_len = need - bus->rbuffer_size; | |
949 | ||
15d5af81 LP |
950 | if (bus->prefer_readv) |
951 | k = readv(bus->input_fd, &iov, 1); | |
952 | else { | |
953 | zero(mh); | |
954 | mh.msg_iov = &iov; | |
955 | mh.msg_iovlen = 1; | |
956 | mh.msg_control = &control; | |
957 | mh.msg_controllen = sizeof(control); | |
958 | ||
959 | k = recvmsg(bus->input_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC); | |
960 | if (k < 0 && errno == ENOTSOCK) { | |
961 | bus->prefer_readv = true; | |
962 | k = readv(bus->input_fd, &iov, 1); | |
963 | } else | |
964 | handle_cmsg = true; | |
965 | } | |
a7e3212d LP |
966 | if (k < 0) |
967 | return errno == EAGAIN ? 0 : -errno; | |
968 | if (k == 0) | |
969 | return -ECONNRESET; | |
970 | ||
971 | bus->rbuffer_size += k; | |
972 | ||
2a1288ff LP |
973 | if (handle_cmsg) { |
974 | struct cmsghdr *cmsg; | |
975 | ||
976 | CMSG_FOREACH(cmsg, &mh) | |
15d5af81 LP |
977 | if (cmsg->cmsg_level == SOL_SOCKET && |
978 | cmsg->cmsg_type == SCM_RIGHTS) { | |
979 | int n, *f; | |
980 | ||
981 | n = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); | |
982 | ||
983 | if (!bus->can_fds) { | |
984 | /* Whut? We received fds but this | |
985 | * isn't actually enabled? Close them, | |
986 | * and fail */ | |
987 | ||
988 | close_many((int*) CMSG_DATA(cmsg), n); | |
989 | return -EIO; | |
990 | } | |
991 | ||
a0f5ab70 | 992 | f = realloc(bus->fds, sizeof(int) * (bus->n_fds + n)); |
15d5af81 LP |
993 | if (!f) { |
994 | close_many((int*) CMSG_DATA(cmsg), n); | |
995 | return -ENOMEM; | |
996 | } | |
997 | ||
998 | memcpy(f + bus->n_fds, CMSG_DATA(cmsg), n * sizeof(int)); | |
999 | bus->fds = f; | |
1000 | bus->n_fds += n; | |
d868f2a3 ZJS |
1001 | } else |
1002 | log_debug("Got unexpected auxiliary data with level=%d and type=%d", | |
1003 | cmsg->cmsg_level, cmsg->cmsg_type); | |
2a1288ff | 1004 | } |
a7e3212d LP |
1005 | |
1006 | r = bus_socket_read_message_need(bus, &need); | |
1007 | if (r < 0) | |
1008 | return r; | |
1009 | ||
1010 | if (bus->rbuffer_size >= need) | |
7d22c717 | 1011 | return bus_socket_make_message(bus, need); |
a7e3212d LP |
1012 | |
1013 | return 1; | |
1014 | } | |
1015 | ||
1016 | int bus_socket_process_opening(sd_bus *b) { | |
1017 | int error = 0; | |
1018 | socklen_t slen = sizeof(error); | |
b92bea5d ZJS |
1019 | struct pollfd p = { |
1020 | .fd = b->output_fd, | |
1021 | .events = POLLOUT, | |
1022 | }; | |
a7e3212d LP |
1023 | int r; |
1024 | ||
a7e3212d LP |
1025 | assert(b->state == BUS_OPENING); |
1026 | ||
a7e3212d LP |
1027 | r = poll(&p, 1, 0); |
1028 | if (r < 0) | |
1029 | return -errno; | |
1030 | ||
1031 | if (!(p.revents & (POLLOUT|POLLERR|POLLHUP))) | |
1032 | return 0; | |
1033 | ||
e82c9509 | 1034 | r = getsockopt(b->output_fd, SOL_SOCKET, SO_ERROR, &error, &slen); |
a7e3212d LP |
1035 | if (r < 0) |
1036 | b->last_connect_error = errno; | |
1037 | else if (error != 0) | |
1038 | b->last_connect_error = error; | |
1039 | else if (p.revents & (POLLERR|POLLHUP)) | |
1040 | b->last_connect_error = ECONNREFUSED; | |
1041 | else | |
1042 | return bus_socket_start_auth(b); | |
1043 | ||
1044 | return bus_next_address(b); | |
1045 | } | |
1046 | ||
1047 | int bus_socket_process_authenticating(sd_bus *b) { | |
1048 | int r; | |
1049 | ||
1050 | assert(b); | |
1051 | assert(b->state == BUS_AUTHENTICATING); | |
1052 | ||
1053 | if (now(CLOCK_MONOTONIC) >= b->auth_timeout) | |
1054 | return -ETIMEDOUT; | |
1055 | ||
1056 | r = bus_socket_write_auth(b); | |
1057 | if (r != 0) | |
1058 | return r; | |
1059 | ||
1060 | return bus_socket_read_auth(b); | |
1061 | } |