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d093b62c LP |
1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
2 | ||
3 | #include <poll.h> | |
4 | #include <sys/wait.h> | |
5 | ||
6 | #include "sd-daemon.h" | |
7 | ||
8 | #include "env-util.h" | |
9 | #include "fd-util.h" | |
10 | #include "group-record-nss.h" | |
11 | #include "group-record.h" | |
0f2d351f | 12 | #include "io-util.h" |
d093b62c LP |
13 | #include "main-func.h" |
14 | #include "process-util.h" | |
15 | #include "strv.h" | |
16 | #include "time-util.h" | |
17 | #include "user-record-nss.h" | |
18 | #include "user-record.h" | |
19 | #include "user-util.h" | |
20 | #include "userdb.h" | |
21 | #include "varlink.h" | |
22 | ||
23 | #define ITERATIONS_MAX 64U | |
24 | #define RUNTIME_MAX_USEC (5 * USEC_PER_MINUTE) | |
25 | #define PRESSURE_SLEEP_TIME_USEC (50 * USEC_PER_MSEC) | |
26 | #define CONNECTION_IDLE_USEC (15 * USEC_PER_SEC) | |
27 | #define LISTEN_IDLE_USEC (90 * USEC_PER_SEC) | |
28 | ||
29 | typedef struct LookupParameters { | |
30 | const char *user_name; | |
31 | const char *group_name; | |
32 | union { | |
33 | uid_t uid; | |
34 | gid_t gid; | |
35 | }; | |
36 | const char *service; | |
37 | } LookupParameters; | |
38 | ||
39 | static int add_nss_service(JsonVariant **v) { | |
40 | _cleanup_(json_variant_unrefp) JsonVariant *status = NULL, *z = NULL; | |
41 | char buf[SD_ID128_STRING_MAX]; | |
42 | sd_id128_t mid; | |
43 | int r; | |
44 | ||
45 | assert(v); | |
46 | ||
47 | /* Patch in service field if it's missing. The assumption here is that this field is unset only for | |
48 | * NSS records */ | |
49 | ||
50 | if (json_variant_by_key(*v, "service")) | |
51 | return 0; | |
52 | ||
53 | r = sd_id128_get_machine(&mid); | |
54 | if (r < 0) | |
55 | return r; | |
56 | ||
57 | status = json_variant_ref(json_variant_by_key(*v, "status")); | |
58 | z = json_variant_ref(json_variant_by_key(status, sd_id128_to_string(mid, buf))); | |
59 | ||
60 | if (json_variant_by_key(z, "service")) | |
61 | return 0; | |
62 | ||
63 | r = json_variant_set_field_string(&z, "service", "io.systemd.NameServiceSwitch"); | |
64 | if (r < 0) | |
65 | return r; | |
66 | ||
67 | r = json_variant_set_field(&status, buf, z); | |
68 | if (r < 0) | |
69 | return r; | |
70 | ||
71 | return json_variant_set_field(v, "status", status); | |
72 | } | |
73 | ||
74 | static int build_user_json(Varlink *link, UserRecord *ur, JsonVariant **ret) { | |
75 | _cleanup_(user_record_unrefp) UserRecord *stripped = NULL; | |
76 | _cleanup_(json_variant_unrefp) JsonVariant *v = NULL; | |
77 | UserRecordLoadFlags flags; | |
78 | uid_t peer_uid; | |
79 | bool trusted; | |
80 | int r; | |
81 | ||
82 | assert(ur); | |
83 | assert(ret); | |
84 | ||
85 | r = varlink_get_peer_uid(link, &peer_uid); | |
86 | if (r < 0) { | |
87 | log_debug_errno(r, "Unable to query peer UID, ignoring: %m"); | |
88 | trusted = false; | |
89 | } else | |
90 | trusted = peer_uid == 0 || peer_uid == ur->uid; | |
91 | ||
92 | flags = USER_RECORD_REQUIRE_REGULAR|USER_RECORD_ALLOW_PER_MACHINE|USER_RECORD_ALLOW_BINDING|USER_RECORD_STRIP_SECRET|USER_RECORD_ALLOW_STATUS|USER_RECORD_ALLOW_SIGNATURE; | |
93 | if (trusted) | |
94 | flags |= USER_RECORD_ALLOW_PRIVILEGED; | |
95 | else | |
96 | flags |= USER_RECORD_STRIP_PRIVILEGED; | |
97 | ||
98 | r = user_record_clone(ur, flags, &stripped); | |
99 | if (r < 0) | |
100 | return r; | |
101 | ||
102 | stripped->incomplete = | |
103 | ur->incomplete || | |
104 | (FLAGS_SET(ur->mask, USER_RECORD_PRIVILEGED) && | |
105 | !FLAGS_SET(stripped->mask, USER_RECORD_PRIVILEGED)); | |
106 | ||
107 | v = json_variant_ref(stripped->json); | |
108 | r = add_nss_service(&v); | |
109 | if (r < 0) | |
110 | return r; | |
111 | ||
112 | return json_build(ret, JSON_BUILD_OBJECT( | |
113 | JSON_BUILD_PAIR("record", JSON_BUILD_VARIANT(v)), | |
114 | JSON_BUILD_PAIR("incomplete", JSON_BUILD_BOOLEAN(stripped->incomplete)))); | |
115 | } | |
116 | ||
117 | static int vl_method_get_user_record(Varlink *link, JsonVariant *parameters, VarlinkMethodFlags flags, void *userdata) { | |
118 | ||
119 | static const JsonDispatch dispatch_table[] = { | |
120 | { "uid", JSON_VARIANT_UNSIGNED, json_dispatch_uid_gid, offsetof(LookupParameters, uid), 0 }, | |
121 | { "userName", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(LookupParameters, user_name), 0 }, | |
122 | { "service", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(LookupParameters, service), 0 }, | |
123 | {} | |
124 | }; | |
125 | ||
126 | _cleanup_(json_variant_unrefp) JsonVariant *v = NULL; | |
127 | _cleanup_(user_record_unrefp) UserRecord *hr = NULL; | |
128 | LookupParameters p = { | |
129 | .uid = UID_INVALID, | |
130 | }; | |
131 | int r; | |
132 | ||
133 | assert(parameters); | |
134 | ||
135 | r = json_dispatch(parameters, dispatch_table, NULL, 0, &p); | |
136 | if (r < 0) | |
137 | return r; | |
138 | ||
139 | if (streq_ptr(p.service, "io.systemd.NameServiceSwitch")) { | |
140 | if (uid_is_valid(p.uid)) | |
ed30170e | 141 | r = nss_user_record_by_uid(p.uid, true, &hr); |
d093b62c | 142 | else if (p.user_name) |
ed30170e | 143 | r = nss_user_record_by_name(p.user_name, true, &hr); |
d093b62c LP |
144 | else { |
145 | _cleanup_(json_variant_unrefp) JsonVariant *last = NULL; | |
146 | ||
147 | setpwent(); | |
148 | ||
149 | for (;;) { | |
150 | _cleanup_(user_record_unrefp) UserRecord *z = NULL; | |
151 | _cleanup_free_ char *sbuf = NULL; | |
152 | struct passwd *pw; | |
153 | struct spwd spwd; | |
154 | ||
155 | errno = 0; | |
156 | pw = getpwent(); | |
157 | if (!pw) { | |
158 | if (errno != 0) | |
159 | log_debug_errno(errno, "Failure while iterating through NSS user database, ignoring: %m"); | |
160 | ||
161 | break; | |
162 | } | |
163 | ||
164 | r = nss_spwd_for_passwd(pw, &spwd, &sbuf); | |
165 | if (r < 0) | |
166 | log_debug_errno(r, "Failed to acquire shadow entry for user %s, ignoring: %m", pw->pw_name); | |
167 | ||
168 | r = nss_passwd_to_user_record(pw, NULL, &z); | |
169 | if (r < 0) { | |
170 | endpwent(); | |
171 | return r; | |
172 | } | |
173 | ||
174 | if (last) { | |
175 | r = varlink_notify(link, last); | |
176 | if (r < 0) { | |
177 | endpwent(); | |
178 | return r; | |
179 | } | |
180 | ||
181 | last = json_variant_unref(last); | |
182 | } | |
183 | ||
184 | r = build_user_json(link, z, &last); | |
185 | if (r < 0) { | |
186 | endpwent(); | |
187 | return r; | |
188 | } | |
189 | } | |
190 | ||
191 | endpwent(); | |
192 | ||
193 | if (!last) | |
194 | return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL); | |
195 | ||
196 | return varlink_reply(link, last); | |
197 | } | |
198 | ||
199 | } else if (streq_ptr(p.service, "io.systemd.Multiplexer")) { | |
200 | ||
201 | if (uid_is_valid(p.uid)) | |
202 | r = userdb_by_uid(p.uid, USERDB_AVOID_MULTIPLEXER, &hr); | |
203 | else if (p.user_name) | |
204 | r = userdb_by_name(p.user_name, USERDB_AVOID_MULTIPLEXER, &hr); | |
205 | else { | |
206 | _cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL; | |
207 | _cleanup_(json_variant_unrefp) JsonVariant *last = NULL; | |
208 | ||
209 | r = userdb_all(USERDB_AVOID_MULTIPLEXER, &iterator); | |
210 | if (r < 0) | |
211 | return r; | |
212 | ||
213 | for (;;) { | |
214 | _cleanup_(user_record_unrefp) UserRecord *z = NULL; | |
215 | ||
216 | r = userdb_iterator_get(iterator, &z); | |
217 | if (r == -ESRCH) | |
218 | break; | |
219 | if (r < 0) | |
220 | return r; | |
221 | ||
222 | if (last) { | |
223 | r = varlink_notify(link, last); | |
224 | if (r < 0) | |
225 | return r; | |
226 | ||
227 | last = json_variant_unref(last); | |
228 | } | |
229 | ||
230 | r = build_user_json(link, z, &last); | |
231 | if (r < 0) | |
232 | return r; | |
233 | } | |
234 | ||
235 | if (!last) | |
236 | return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL); | |
237 | ||
238 | return varlink_reply(link, last); | |
239 | } | |
240 | } else | |
241 | return varlink_error(link, "io.systemd.UserDatabase.BadService", NULL); | |
242 | if (r == -ESRCH) | |
243 | return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL); | |
244 | if (r < 0) { | |
245 | log_debug_errno(r, "User lookup failed abnormally: %m"); | |
246 | return varlink_error(link, "io.systemd.UserDatabase.ServiceNotAvailable", NULL); | |
247 | } | |
248 | ||
249 | if ((uid_is_valid(p.uid) && hr->uid != p.uid) || | |
250 | (p.user_name && !streq(hr->user_name, p.user_name))) | |
251 | return varlink_error(link, "io.systemd.UserDatabase.ConflictingRecordFound", NULL); | |
252 | ||
253 | r = build_user_json(link, hr, &v); | |
254 | if (r < 0) | |
255 | return r; | |
256 | ||
257 | return varlink_reply(link, v); | |
258 | } | |
259 | ||
260 | static int build_group_json(Varlink *link, GroupRecord *gr, JsonVariant **ret) { | |
261 | _cleanup_(group_record_unrefp) GroupRecord *stripped = NULL; | |
262 | _cleanup_(json_variant_unrefp) JsonVariant *v = NULL; | |
263 | UserRecordLoadFlags flags; | |
264 | uid_t peer_uid; | |
265 | bool trusted; | |
266 | int r; | |
267 | ||
268 | assert(gr); | |
269 | assert(ret); | |
270 | ||
271 | r = varlink_get_peer_uid(link, &peer_uid); | |
272 | if (r < 0) { | |
273 | log_debug_errno(r, "Unable to query peer UID, ignoring: %m"); | |
274 | trusted = false; | |
275 | } else | |
276 | trusted = peer_uid == 0; | |
277 | ||
278 | flags = USER_RECORD_REQUIRE_REGULAR|USER_RECORD_ALLOW_PER_MACHINE|USER_RECORD_ALLOW_BINDING|USER_RECORD_STRIP_SECRET|USER_RECORD_ALLOW_STATUS|USER_RECORD_ALLOW_SIGNATURE; | |
279 | if (trusted) | |
280 | flags |= USER_RECORD_ALLOW_PRIVILEGED; | |
281 | else | |
282 | flags |= USER_RECORD_STRIP_PRIVILEGED; | |
283 | ||
284 | r = group_record_clone(gr, flags, &stripped); | |
285 | if (r < 0) | |
286 | return r; | |
287 | ||
288 | stripped->incomplete = | |
289 | gr->incomplete || | |
290 | (FLAGS_SET(gr->mask, USER_RECORD_PRIVILEGED) && | |
291 | !FLAGS_SET(stripped->mask, USER_RECORD_PRIVILEGED)); | |
292 | ||
293 | v = json_variant_ref(gr->json); | |
294 | r = add_nss_service(&v); | |
295 | if (r < 0) | |
296 | return r; | |
297 | ||
298 | return json_build(ret, JSON_BUILD_OBJECT( | |
299 | JSON_BUILD_PAIR("record", JSON_BUILD_VARIANT(v)), | |
300 | JSON_BUILD_PAIR("incomplete", JSON_BUILD_BOOLEAN(stripped->incomplete)))); | |
301 | } | |
302 | ||
303 | static int vl_method_get_group_record(Varlink *link, JsonVariant *parameters, VarlinkMethodFlags flags, void *userdata) { | |
304 | ||
305 | static const JsonDispatch dispatch_table[] = { | |
306 | { "gid", JSON_VARIANT_UNSIGNED, json_dispatch_uid_gid, offsetof(LookupParameters, gid), 0 }, | |
307 | { "groupName", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(LookupParameters, group_name), 0 }, | |
308 | { "service", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(LookupParameters, service), 0 }, | |
309 | {} | |
310 | }; | |
311 | ||
312 | _cleanup_(json_variant_unrefp) JsonVariant *v = NULL; | |
313 | _cleanup_(group_record_unrefp) GroupRecord *g = NULL; | |
314 | LookupParameters p = { | |
315 | .gid = GID_INVALID, | |
316 | }; | |
317 | int r; | |
318 | ||
319 | assert(parameters); | |
320 | ||
321 | r = json_dispatch(parameters, dispatch_table, NULL, 0, &p); | |
322 | if (r < 0) | |
323 | return r; | |
324 | ||
325 | if (streq_ptr(p.service, "io.systemd.NameServiceSwitch")) { | |
326 | ||
327 | if (gid_is_valid(p.gid)) | |
ed30170e | 328 | r = nss_group_record_by_gid(p.gid, true, &g); |
d093b62c | 329 | else if (p.group_name) |
ed30170e | 330 | r = nss_group_record_by_name(p.group_name, true, &g); |
d093b62c LP |
331 | else { |
332 | _cleanup_(json_variant_unrefp) JsonVariant *last = NULL; | |
333 | ||
334 | setgrent(); | |
335 | ||
336 | for (;;) { | |
337 | _cleanup_(group_record_unrefp) GroupRecord *z = NULL; | |
338 | _cleanup_free_ char *sbuf = NULL; | |
339 | struct group *grp; | |
340 | struct sgrp sgrp; | |
341 | ||
342 | errno = 0; | |
343 | grp = getgrent(); | |
344 | if (!grp) { | |
345 | if (errno != 0) | |
346 | log_debug_errno(errno, "Failure while iterating through NSS group database, ignoring: %m"); | |
347 | ||
348 | break; | |
349 | } | |
350 | ||
351 | r = nss_sgrp_for_group(grp, &sgrp, &sbuf); | |
352 | if (r < 0) | |
353 | log_debug_errno(r, "Failed to acquire shadow entry for group %s, ignoring: %m", grp->gr_name); | |
354 | ||
355 | r = nss_group_to_group_record(grp, r >= 0 ? &sgrp : NULL, &z); | |
356 | if (r < 0) { | |
357 | endgrent(); | |
358 | return r; | |
359 | } | |
360 | ||
361 | if (last) { | |
362 | r = varlink_notify(link, last); | |
363 | if (r < 0) { | |
364 | endgrent(); | |
365 | return r; | |
366 | } | |
367 | ||
368 | last = json_variant_unref(last); | |
369 | } | |
370 | ||
371 | r = build_group_json(link, z, &last); | |
372 | if (r < 0) { | |
373 | endgrent(); | |
374 | return r; | |
375 | } | |
376 | } | |
377 | ||
378 | endgrent(); | |
379 | ||
380 | if (!last) | |
381 | return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL); | |
382 | ||
383 | return varlink_reply(link, last); | |
384 | } | |
385 | ||
386 | } else if (streq_ptr(p.service, "io.systemd.Multiplexer")) { | |
387 | ||
388 | if (gid_is_valid(p.gid)) | |
389 | r = groupdb_by_gid(p.gid, USERDB_AVOID_MULTIPLEXER, &g); | |
390 | else if (p.group_name) | |
391 | r = groupdb_by_name(p.group_name, USERDB_AVOID_MULTIPLEXER, &g); | |
392 | else { | |
393 | _cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL; | |
394 | _cleanup_(json_variant_unrefp) JsonVariant *last = NULL; | |
395 | ||
396 | r = groupdb_all(USERDB_AVOID_MULTIPLEXER, &iterator); | |
397 | if (r < 0) | |
398 | return r; | |
399 | ||
400 | for (;;) { | |
401 | _cleanup_(group_record_unrefp) GroupRecord *z = NULL; | |
402 | ||
403 | r = groupdb_iterator_get(iterator, &z); | |
404 | if (r == -ESRCH) | |
405 | break; | |
406 | if (r < 0) | |
407 | return r; | |
408 | ||
409 | if (last) { | |
410 | r = varlink_notify(link, last); | |
411 | if (r < 0) | |
412 | return r; | |
413 | ||
414 | last = json_variant_unref(last); | |
415 | } | |
416 | ||
417 | r = build_group_json(link, z, &last); | |
418 | if (r < 0) | |
419 | return r; | |
420 | } | |
421 | ||
422 | if (!last) | |
423 | return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL); | |
424 | ||
425 | return varlink_reply(link, last); | |
426 | } | |
427 | } else | |
428 | return varlink_error(link, "io.systemd.UserDatabase.BadService", NULL); | |
429 | if (r == -ESRCH) | |
430 | return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL); | |
431 | if (r < 0) { | |
432 | log_debug_errno(r, "Group lookup failed abnormally: %m"); | |
433 | return varlink_error(link, "io.systemd.UserDatabase.ServiceNotAvailable", NULL); | |
434 | } | |
435 | ||
436 | if ((uid_is_valid(p.gid) && g->gid != p.gid) || | |
437 | (p.group_name && !streq(g->group_name, p.group_name))) | |
438 | return varlink_error(link, "io.systemd.UserDatabase.ConflictingRecordFound", NULL); | |
439 | ||
440 | r = build_group_json(link, g, &v); | |
441 | if (r < 0) | |
442 | return r; | |
443 | ||
444 | return varlink_reply(link, v); | |
445 | } | |
446 | ||
447 | static int vl_method_get_memberships(Varlink *link, JsonVariant *parameters, VarlinkMethodFlags flags, void *userdata) { | |
448 | static const JsonDispatch dispatch_table[] = { | |
449 | { "userName", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(LookupParameters, user_name), 0 }, | |
450 | { "groupName", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(LookupParameters, group_name), 0 }, | |
451 | { "service", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(LookupParameters, service), 0 }, | |
452 | {} | |
453 | }; | |
454 | ||
455 | LookupParameters p = {}; | |
456 | int r; | |
457 | ||
458 | assert(parameters); | |
459 | ||
460 | r = json_dispatch(parameters, dispatch_table, NULL, 0, &p); | |
461 | if (r < 0) | |
462 | return r; | |
463 | ||
464 | if (streq_ptr(p.service, "io.systemd.NameServiceSwitch")) { | |
465 | ||
466 | if (p.group_name) { | |
467 | _cleanup_(group_record_unrefp) GroupRecord *g = NULL; | |
468 | const char *last = NULL; | |
469 | char **i; | |
470 | ||
ed30170e | 471 | r = nss_group_record_by_name(p.group_name, true, &g); |
d093b62c LP |
472 | if (r == -ESRCH) |
473 | return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL); | |
474 | if (r < 0) | |
475 | return r; | |
476 | ||
477 | STRV_FOREACH(i, g->members) { | |
478 | ||
479 | if (p.user_name && !streq_ptr(p.user_name, *i)) | |
480 | continue; | |
481 | ||
482 | if (last) { | |
483 | r = varlink_notifyb(link, JSON_BUILD_OBJECT( | |
484 | JSON_BUILD_PAIR("userName", JSON_BUILD_STRING(last)), | |
485 | JSON_BUILD_PAIR("groupName", JSON_BUILD_STRING(g->group_name)))); | |
486 | if (r < 0) | |
487 | return r; | |
488 | } | |
489 | ||
490 | last = *i; | |
491 | } | |
492 | ||
493 | if (!last) | |
494 | return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL); | |
495 | ||
496 | return varlink_replyb(link, JSON_BUILD_OBJECT( | |
497 | JSON_BUILD_PAIR("userName", JSON_BUILD_STRING(last)), | |
498 | JSON_BUILD_PAIR("groupName", JSON_BUILD_STRING(g->group_name)))); | |
499 | } else { | |
500 | _cleanup_free_ char *last_user_name = NULL, *last_group_name = NULL; | |
501 | ||
502 | setgrent(); | |
503 | ||
504 | for (;;) { | |
505 | struct group *grp; | |
506 | const char* two[2], **users, **i; | |
507 | ||
508 | errno = 0; | |
509 | grp = getgrent(); | |
510 | if (!grp) { | |
511 | if (errno != 0) | |
512 | log_debug_errno(errno, "Failure while iterating through NSS group database, ignoring: %m"); | |
513 | ||
514 | break; | |
515 | } | |
516 | ||
517 | if (p.user_name) { | |
518 | if (!strv_contains(grp->gr_mem, p.user_name)) | |
519 | continue; | |
520 | ||
521 | two[0] = p.user_name; | |
522 | two[1] = NULL; | |
523 | ||
524 | users = two; | |
525 | } else | |
526 | users = (const char**) grp->gr_mem; | |
527 | ||
528 | STRV_FOREACH(i, users) { | |
529 | ||
530 | if (last_user_name) { | |
531 | assert(last_group_name); | |
532 | ||
533 | r = varlink_notifyb(link, JSON_BUILD_OBJECT( | |
534 | JSON_BUILD_PAIR("userName", JSON_BUILD_STRING(last_user_name)), | |
535 | JSON_BUILD_PAIR("groupName", JSON_BUILD_STRING(last_group_name)))); | |
536 | if (r < 0) { | |
537 | endgrent(); | |
538 | return r; | |
539 | } | |
540 | ||
541 | free(last_user_name); | |
542 | free(last_group_name); | |
543 | } | |
544 | ||
545 | last_user_name = strdup(*i); | |
546 | last_group_name = strdup(grp->gr_name); | |
547 | if (!last_user_name || !last_group_name) { | |
548 | endgrent(); | |
549 | return -ENOMEM; | |
550 | } | |
551 | } | |
552 | } | |
553 | ||
554 | endgrent(); | |
555 | ||
556 | if (!last_user_name) { | |
557 | assert(!last_group_name); | |
558 | return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL); | |
559 | } | |
560 | ||
561 | assert(last_group_name); | |
562 | ||
563 | return varlink_replyb(link, JSON_BUILD_OBJECT( | |
564 | JSON_BUILD_PAIR("userName", JSON_BUILD_STRING(last_user_name)), | |
565 | JSON_BUILD_PAIR("groupName", JSON_BUILD_STRING(last_group_name)))); | |
566 | } | |
567 | ||
568 | } else if (streq_ptr(p.service, "io.systemd.Multiplexer")) { | |
569 | ||
570 | _cleanup_free_ char *last_user_name = NULL, *last_group_name = NULL; | |
571 | _cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL; | |
572 | ||
573 | if (p.group_name) | |
574 | r = membershipdb_by_group(p.group_name, USERDB_AVOID_MULTIPLEXER, &iterator); | |
575 | else if (p.user_name) | |
576 | r = membershipdb_by_user(p.user_name, USERDB_AVOID_MULTIPLEXER, &iterator); | |
577 | else | |
578 | r = membershipdb_all(USERDB_AVOID_MULTIPLEXER, &iterator); | |
579 | if (r < 0) | |
580 | return r; | |
581 | ||
582 | for (;;) { | |
583 | _cleanup_free_ char *user_name = NULL, *group_name = NULL; | |
584 | ||
585 | r = membershipdb_iterator_get(iterator, &user_name, &group_name); | |
586 | if (r == -ESRCH) | |
587 | break; | |
588 | if (r < 0) | |
589 | return r; | |
590 | ||
591 | /* If both group + user are specified do a-posteriori filtering */ | |
592 | if (p.group_name && p.user_name && !streq(group_name, p.group_name)) | |
593 | continue; | |
594 | ||
595 | if (last_user_name) { | |
596 | assert(last_group_name); | |
597 | ||
598 | r = varlink_notifyb(link, JSON_BUILD_OBJECT( | |
599 | JSON_BUILD_PAIR("userName", JSON_BUILD_STRING(last_user_name)), | |
600 | JSON_BUILD_PAIR("groupName", JSON_BUILD_STRING(last_group_name)))); | |
601 | if (r < 0) | |
602 | return r; | |
603 | ||
604 | free(last_user_name); | |
605 | free(last_group_name); | |
606 | } | |
607 | ||
608 | last_user_name = TAKE_PTR(user_name); | |
609 | last_group_name = TAKE_PTR(group_name); | |
610 | } | |
611 | ||
612 | if (!last_user_name) { | |
613 | assert(!last_group_name); | |
614 | return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL); | |
615 | } | |
616 | ||
617 | assert(last_group_name); | |
618 | ||
619 | return varlink_replyb(link, JSON_BUILD_OBJECT( | |
620 | JSON_BUILD_PAIR("userName", JSON_BUILD_STRING(last_user_name)), | |
621 | JSON_BUILD_PAIR("groupName", JSON_BUILD_STRING(last_group_name)))); | |
622 | } | |
623 | ||
624 | return varlink_error(link, "io.systemd.UserDatabase.BadService", NULL); | |
625 | } | |
626 | ||
627 | static int process_connection(VarlinkServer *server, int fd) { | |
628 | _cleanup_(varlink_close_unrefp) Varlink *vl = NULL; | |
629 | int r; | |
630 | ||
631 | r = varlink_server_add_connection(server, fd, &vl); | |
632 | if (r < 0) { | |
633 | fd = safe_close(fd); | |
634 | return log_error_errno(r, "Failed to add connection: %m"); | |
635 | } | |
636 | ||
637 | vl = varlink_ref(vl); | |
638 | ||
639 | for (;;) { | |
640 | r = varlink_process(vl); | |
641 | if (r == -ENOTCONN) { | |
642 | log_debug("Connection terminated."); | |
643 | break; | |
644 | } | |
645 | if (r < 0) | |
646 | return log_error_errno(r, "Failed to process connection: %m"); | |
647 | if (r > 0) | |
648 | continue; | |
649 | ||
650 | r = varlink_wait(vl, CONNECTION_IDLE_USEC); | |
651 | if (r < 0) | |
652 | return log_error_errno(r, "Failed to wait for connection events: %m"); | |
653 | if (r == 0) | |
654 | break; | |
655 | } | |
656 | ||
657 | return 0; | |
658 | } | |
659 | ||
660 | static int run(int argc, char *argv[]) { | |
661 | usec_t start_time, listen_idle_usec, last_busy_usec = USEC_INFINITY; | |
662 | _cleanup_(varlink_server_unrefp) VarlinkServer *server = NULL; | |
d093b62c LP |
663 | unsigned n_iterations = 0; |
664 | int m, listen_fd, r; | |
665 | ||
666 | log_setup_service(); | |
667 | ||
668 | m = sd_listen_fds(false); | |
669 | if (m < 0) | |
670 | return log_error_errno(m, "Failed to determine number of listening fds: %m"); | |
671 | if (m == 0) | |
672 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "No socket to listen on received."); | |
673 | if (m > 1) | |
674 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Worker can only listen on a single socket at a time."); | |
675 | ||
676 | listen_fd = SD_LISTEN_FDS_START; | |
677 | ||
678 | r = fd_nonblock(listen_fd, false); | |
679 | if (r < 0) | |
680 | return log_error_errno(r, "Failed to turn off non-blocking mode for listening socket: %m"); | |
681 | ||
682 | r = varlink_server_new(&server, 0); | |
683 | if (r < 0) | |
684 | return log_error_errno(r, "Failed to allocate server: %m"); | |
685 | ||
686 | r = varlink_server_bind_method_many( | |
687 | server, | |
688 | "io.systemd.UserDatabase.GetUserRecord", vl_method_get_user_record, | |
689 | "io.systemd.UserDatabase.GetGroupRecord", vl_method_get_group_record, | |
690 | "io.systemd.UserDatabase.GetMemberships", vl_method_get_memberships); | |
691 | if (r < 0) | |
692 | return log_error_errno(r, "Failed to bind methods: %m"); | |
693 | ||
694 | r = getenv_bool("USERDB_FIXED_WORKER"); | |
695 | if (r < 0) | |
696 | return log_error_errno(r, "Failed to parse USERDB_FIXED_WORKER: %m"); | |
697 | listen_idle_usec = r ? USEC_INFINITY : LISTEN_IDLE_USEC; | |
698 | ||
037b0a47 LP |
699 | r = userdb_block_nss_systemd(true); |
700 | if (r < 0) | |
d093b62c LP |
701 | return log_error_errno(r, "Failed to disable userdb NSS compatibility: %m"); |
702 | ||
703 | start_time = now(CLOCK_MONOTONIC); | |
704 | ||
705 | for (;;) { | |
706 | _cleanup_close_ int fd = -1; | |
707 | usec_t n; | |
708 | ||
709 | /* Exit the worker in regular intervals, to flush out all memory use */ | |
710 | if (n_iterations++ > ITERATIONS_MAX) { | |
711 | log_debug("Exiting worker, processed %u iterations, that's enough.", n_iterations); | |
712 | break; | |
713 | } | |
714 | ||
715 | n = now(CLOCK_MONOTONIC); | |
716 | if (n >= usec_add(start_time, RUNTIME_MAX_USEC)) { | |
717 | char buf[FORMAT_TIMESPAN_MAX]; | |
e14db350 ZJS |
718 | log_debug("Exiting worker, ran for %s, that's enough.", |
719 | format_timespan(buf, sizeof(buf), usec_sub_unsigned(n, start_time), 0)); | |
d093b62c LP |
720 | break; |
721 | } | |
722 | ||
723 | if (last_busy_usec == USEC_INFINITY) | |
724 | last_busy_usec = n; | |
725 | else if (listen_idle_usec != USEC_INFINITY && n >= usec_add(last_busy_usec, listen_idle_usec)) { | |
726 | char buf[FORMAT_TIMESPAN_MAX]; | |
40fd0a77 | 727 | log_debug("Exiting worker, been idle for %s.", |
e14db350 | 728 | format_timespan(buf, sizeof(buf), usec_sub_unsigned(n, last_busy_usec), 0)); |
d093b62c LP |
729 | break; |
730 | } | |
731 | ||
732 | (void) rename_process("systemd-userwork: waiting..."); | |
733 | ||
734 | fd = accept4(listen_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC); | |
735 | if (fd < 0) | |
736 | fd = -errno; | |
737 | ||
738 | (void) rename_process("systemd-userwork: processing..."); | |
739 | ||
740 | if (fd == -EAGAIN) | |
e14db350 | 741 | continue; /* The listening socket has SO_RECVTIMEO set, hence a timeout is expected |
d093b62c LP |
742 | * after a while, let's check if it's time to exit though. */ |
743 | if (fd == -EINTR) | |
744 | continue; /* Might be that somebody attached via strace, let's just continue in that | |
745 | * case */ | |
746 | if (fd < 0) | |
747 | return log_error_errno(fd, "Failed to accept() from listening socket: %m"); | |
748 | ||
749 | if (now(CLOCK_MONOTONIC) <= usec_add(n, PRESSURE_SLEEP_TIME_USEC)) { | |
d093b62c LP |
750 | /* We only slept a very short time? If so, let's see if there are more sockets |
751 | * pending, and if so, let's ask our parent for more workers */ | |
752 | ||
0f2d351f LP |
753 | r = fd_wait_for_event(listen_fd, POLLIN, 0); |
754 | if (r < 0) | |
755 | return log_error_errno(r, "Failed to test for POLLIN on listening socket: %m"); | |
d093b62c | 756 | |
0f2d351f | 757 | if (FLAGS_SET(r, POLLIN)) { |
d093b62c LP |
758 | pid_t parent; |
759 | ||
760 | parent = getppid(); | |
761 | if (parent <= 1) | |
762 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Parent already died?"); | |
763 | ||
e3028514 | 764 | if (kill(parent, SIGUSR2) < 0) |
d093b62c LP |
765 | return log_error_errno(errno, "Failed to kill our own parent."); |
766 | } | |
767 | } | |
768 | ||
769 | (void) process_connection(server, TAKE_FD(fd)); | |
770 | last_busy_usec = USEC_INFINITY; | |
771 | } | |
772 | ||
773 | return 0; | |
774 | } | |
775 | ||
776 | DEFINE_MAIN_FUNCTION(run); |