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Date:: Wed Dec 27 13:28:50 2023 UTC
Message:: fix swapped format string arguments in gotd verify_imsg_src()
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1 /*
2  * Copyright (c) 2022 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/tree.h>
19 #include <sys/time.h>
20 #include <sys/types.h>
21 #include <sys/stat.h>
22 #include <sys/socket.h>
23 #include <sys/un.h>
24 #include <sys/wait.h>
25 #include <sys/resource.h>
26 
27 #include <fcntl.h>
28 #include <err.h>
29 #include <errno.h>
30 #include <event.h>
31 #include <limits.h>
32 #include <pwd.h>
33 #include <imsg.h>
34 #include <sha1.h>
35 #include <sha2.h>
36 #include <signal.h>
37 #include <siphash.h>
38 #include <stdarg.h>
39 #include <stdio.h>
40 #include <stdlib.h>
41 #include <string.h>
42 #include <syslog.h>
43 #include <unistd.h>
44 
45 #include "got_error.h"
46 #include "got_opentemp.h"
47 #include "got_path.h"
48 #include "got_repository.h"
49 #include "got_object.h"
50 #include "got_reference.h"
51 
52 #include "got_lib_delta.h"
53 #include "got_lib_object.h"
54 #include "got_lib_object_cache.h"
55 #include "got_lib_hash.h"
56 #include "got_lib_gitproto.h"
57 #include "got_lib_pack.h"
58 #include "got_lib_repository.h"
59 
60 #include "gotd.h"
61 #include "log.h"
62 #include "listen.h"
63 #include "auth.h"
64 #include "session.h"
65 #include "repo_read.h"
66 #include "repo_write.h"
67 
68 #ifndef nitems
69 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
70 #endif
71 
72 enum gotd_client_state {
73 	GOTD_CLIENT_STATE_NEW,
74 	GOTD_CLIENT_STATE_ACCESS_GRANTED,
75 };
76 
77 struct gotd_child_proc {
78 	pid_t				 pid;
79 	enum gotd_procid		 type;
80 	char				 repo_name[NAME_MAX];
81 	char				 repo_path[PATH_MAX];
82 	int				 pipe[2];
83 	struct gotd_imsgev		 iev;
84 	struct event			 tmo;
85 
86 	TAILQ_ENTRY(gotd_child_proc)	 entry;
87 };
88 TAILQ_HEAD(gotd_procs, gotd_child_proc) procs;
89 
90 struct gotd_client {
91 	STAILQ_ENTRY(gotd_client)	 entry;
92 	enum gotd_client_state		 state;
93 	uint32_t			 id;
94 	int				 fd;
95 	struct gotd_imsgev		 iev;
96 	struct event			 tmo;
97 	uid_t				 euid;
98 	gid_t				 egid;
99 	char				*username;
100 	struct gotd_child_proc		*repo;
101 	struct gotd_child_proc		*auth;
102 	struct gotd_child_proc		*session;
103 	int				 required_auth;
104 };
105 STAILQ_HEAD(gotd_clients, gotd_client);
106 
107 static struct gotd_clients gotd_clients[GOTD_CLIENT_TABLE_SIZE];
108 static SIPHASH_KEY clients_hash_key;
109 volatile int client_cnt;
110 static struct timeval auth_timeout = { 5, 0 };
111 static struct gotd gotd;
112 
113 void gotd_sighdlr(int sig, short event, void *arg);
114 static void gotd_shutdown(void);
115 static const struct got_error *start_session_child(struct gotd_client *,
116     struct gotd_repo *, char *, const char *, int, int);
117 static const struct got_error *start_repo_child(struct gotd_client *,
118     enum gotd_procid, struct gotd_repo *, char *, const char *, int, int);
119 static const struct got_error *start_auth_child(struct gotd_client *, int,
120     struct gotd_repo *, char *, const char *, int, int);
121 static void kill_proc(struct gotd_child_proc *, int);
122 static void disconnect(struct gotd_client *);
123 
124 __dead static void
125 usage(void)
126 {
127 	fprintf(stderr, "usage: %s [-dnv] [-f config-file]\n", getprogname());
128 	exit(1);
129 }
130 
131 static int
132 unix_socket_listen(const char *unix_socket_path, uid_t uid, gid_t gid)
133 {
134 	struct sockaddr_un sun;
135 	int fd = -1;
136 	mode_t old_umask, mode;
137 
138 	fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK| SOCK_CLOEXEC, 0);
139 	if (fd == -1) {
140 		log_warn("socket");
141 		return -1;
142 	}
143 
144 	sun.sun_family = AF_UNIX;
145 	if (strlcpy(sun.sun_path, unix_socket_path,
146 	    sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
147 		log_warnx("%s: name too long", unix_socket_path);
148 		close(fd);
149 		return -1;
150 	}
151 
152 	if (unlink(unix_socket_path) == -1) {
153 		if (errno != ENOENT) {
154 			log_warn("unlink %s", unix_socket_path);
155 			close(fd);
156 			return -1;
157 		}
158 	}
159 
160 	old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
161 	mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
162 
163 	if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
164 		log_warn("bind: %s", unix_socket_path);
165 		close(fd);
166 		umask(old_umask);
167 		return -1;
168 	}
169 
170 	umask(old_umask);
171 
172 	if (chmod(unix_socket_path, mode) == -1) {
173 		log_warn("chmod %o %s", mode, unix_socket_path);
174 		close(fd);
175 		unlink(unix_socket_path);
176 		return -1;
177 	}
178 
179 	if (chown(unix_socket_path, uid, gid) == -1) {
180 		log_warn("chown %s uid=%d gid=%d", unix_socket_path, uid, gid);
181 		close(fd);
182 		unlink(unix_socket_path);
183 		return -1;
184 	}
185 
186 	if (listen(fd, GOTD_UNIX_SOCKET_BACKLOG) == -1) {
187 		log_warn("listen");
188 		close(fd);
189 		unlink(unix_socket_path);
190 		return -1;
191 	}
192 
193 	return fd;
194 }
195 
196 static uint64_t
197 client_hash(uint32_t client_id)
198 {
199 	return SipHash24(&clients_hash_key, &client_id, sizeof(client_id));
200 }
201 
202 static void
203 add_client(struct gotd_client *client)
204 {
205 	uint64_t slot = client_hash(client->id) % nitems(gotd_clients);
206 	STAILQ_INSERT_HEAD(&gotd_clients[slot], client, entry);
207 	client_cnt++;
208 }
209 
210 static struct gotd_client *
211 find_client(uint32_t client_id)
212 {
213 	uint64_t slot;
214 	struct gotd_client *c;
215 
216 	slot = client_hash(client_id) % nitems(gotd_clients);
217 	STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
218 		if (c->id == client_id)
219 			return c;
220 	}
221 
222 	return NULL;
223 }
224 
225 static struct gotd_client *
226 find_client_by_proc_fd(int fd)
227 {
228 	uint64_t slot;
229 
230 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
231 		struct gotd_client *c;
232 
233 		STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
234 			if (c->repo && c->repo->iev.ibuf.fd == fd)
235 				return c;
236 			if (c->auth && c->auth->iev.ibuf.fd == fd)
237 				return c;
238 			if (c->session && c->session->iev.ibuf.fd == fd)
239 				return c;
240 		}
241 	}
242 
243 	return NULL;
244 }
245 
246 static int
247 client_is_reading(struct gotd_client *client)
248 {
249 	return (client->required_auth &
250 	    (GOTD_AUTH_READ | GOTD_AUTH_WRITE)) == GOTD_AUTH_READ;
251 }
252 
253 static int
254 client_is_writing(struct gotd_client *client)
255 {
256 	return (client->required_auth &
257 	    (GOTD_AUTH_READ | GOTD_AUTH_WRITE)) ==
258 	    (GOTD_AUTH_READ | GOTD_AUTH_WRITE);
259 }
260 
261 static const struct got_error *
262 ensure_client_is_not_writing(struct gotd_client *client)
263 {
264 	if (client_is_writing(client)) {
265 		return got_error_fmt(GOT_ERR_BAD_PACKET,
266 		    "uid %d made a read-request but is writing to "
267 		    "a repository", client->euid);
268 	}
269 
270 	return NULL;
271 }
272 
273 static const struct got_error *
274 ensure_client_is_not_reading(struct gotd_client *client)
275 {
276 	if (client_is_reading(client)) {
277 		return got_error_fmt(GOT_ERR_BAD_PACKET,
278 		    "uid %d made a write-request but is reading from "
279 		    "a repository", client->euid);
280 	}
281 
282 	return NULL;
283 }
284 
285 static void
286 proc_done(struct gotd_child_proc *proc)
287 {
288 	struct gotd_client *client;
289 
290 	TAILQ_REMOVE(&procs, proc, entry);
291 
292 	client = find_client_by_proc_fd(proc->iev.ibuf.fd);
293 	if (client != NULL) {
294 		if (proc == client->repo)
295 			client->repo = NULL;
296 		if (proc == client->auth)
297 			client->auth = NULL;
298 		if (proc == client->session)
299 			client->session = NULL;
300 		disconnect(client);
301 	}
302 
303 	evtimer_del(&proc->tmo);
304 
305 	if (proc->iev.ibuf.fd != -1) {
306 		event_del(&proc->iev.ev);
307 		msgbuf_clear(&proc->iev.ibuf.w);
308 		close(proc->iev.ibuf.fd);
309 	}
310 
311 	free(proc);
312 }
313 
314 static void
315 kill_repo_proc(struct gotd_client *client)
316 {
317 	if (client->repo == NULL)
318 		return;
319 
320 	kill_proc(client->repo, 0);
321 	client->repo = NULL;
322 }
323 
324 static void
325 kill_auth_proc(struct gotd_client *client)
326 {
327 	if (client->auth == NULL)
328 		return;
329 
330 	kill_proc(client->auth, 0);
331 	client->auth = NULL;
332 }
333 
334 static void
335 kill_session_proc(struct gotd_client *client)
336 {
337 	if (client->session == NULL)
338 		return;
339 
340 	kill_proc(client->session, 0);
341 	client->session = NULL;
342 }
343 
344 static void
345 disconnect(struct gotd_client *client)
346 {
347 	struct gotd_imsg_disconnect idisconnect;
348 	struct gotd_child_proc *listen_proc = gotd.listen_proc;
349 	uint64_t slot;
350 
351 	log_debug("uid %d: disconnecting", client->euid);
352 
353 	kill_auth_proc(client);
354 	kill_session_proc(client);
355 	kill_repo_proc(client);
356 
357 	idisconnect.client_id = client->id;
358 	if (gotd_imsg_compose_event(&listen_proc->iev,
359 	    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
360 	    &idisconnect, sizeof(idisconnect)) == -1)
361 		log_warn("imsg compose DISCONNECT");
362 
363 	slot = client_hash(client->id) % nitems(gotd_clients);
364 	STAILQ_REMOVE(&gotd_clients[slot], client, gotd_client, entry);
365 	imsg_clear(&client->iev.ibuf);
366 	event_del(&client->iev.ev);
367 	evtimer_del(&client->tmo);
368 	if (client->fd != -1)
369 		close(client->fd);
370 	else if (client->iev.ibuf.fd != -1)
371 		close(client->iev.ibuf.fd);
372 	free(client->username);
373 	free(client);
374 	client_cnt--;
375 }
376 
377 static void
378 disconnect_on_error(struct gotd_client *client, const struct got_error *err)
379 {
380 	struct imsgbuf ibuf;
381 
382 	if (err->code != GOT_ERR_EOF) {
383 		log_warnx("uid %d: %s", client->euid, err->msg);
384 		if (client->fd != -1) {
385 			imsg_init(&ibuf, client->fd);
386 			gotd_imsg_send_error(&ibuf, 0, PROC_GOTD, err);
387 			imsg_clear(&ibuf);
388 		}
389 	}
390 	disconnect(client);
391 }
392 
393 static const struct got_error *
394 send_repo_info(struct gotd_imsgev *iev, struct gotd_repo *repo)
395 {
396 	const struct got_error *err = NULL;
397 	struct gotd_imsg_info_repo irepo;
398 
399 	memset(&irepo, 0, sizeof(irepo));
400 
401 	if (strlcpy(irepo.repo_name, repo->name, sizeof(irepo.repo_name))
402 	    >= sizeof(irepo.repo_name))
403 		return got_error_msg(GOT_ERR_NO_SPACE, "repo name too long");
404 	if (strlcpy(irepo.repo_path, repo->path, sizeof(irepo.repo_path))
405 	    >= sizeof(irepo.repo_path))
406 		return got_error_msg(GOT_ERR_NO_SPACE, "repo path too long");
407 
408 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_REPO, PROC_GOTD, -1,
409 	    &irepo, sizeof(irepo)) == -1) {
410 		err = got_error_from_errno("imsg compose INFO_REPO");
411 		if (err)
412 			return err;
413 	}
414 
415 	return NULL;
416 }
417 
418 static const struct got_error *
419 send_client_info(struct gotd_imsgev *iev, struct gotd_client *client)
420 {
421 	const struct got_error *err = NULL;
422 	struct gotd_imsg_info_client iclient;
423 	struct gotd_child_proc *proc;
424 
425 	memset(&iclient, 0, sizeof(iclient));
426 	iclient.euid = client->euid;
427 	iclient.egid = client->egid;
428 
429 	proc = client->repo;
430 	if (proc) {
431 		if (strlcpy(iclient.repo_name, proc->repo_path,
432 		    sizeof(iclient.repo_name)) >= sizeof(iclient.repo_name)) {
433 			return got_error_msg(GOT_ERR_NO_SPACE,
434 			    "repo name too long");
435 		}
436 		if (client_is_writing(client))
437 			iclient.is_writing = 1;
438 
439 		iclient.repo_child_pid = proc->pid;
440 	}
441 
442 	if (client->session)
443 		iclient.session_child_pid = client->session->pid;
444 
445 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_CLIENT, PROC_GOTD, -1,
446 	    &iclient, sizeof(iclient)) == -1) {
447 		err = got_error_from_errno("imsg compose INFO_CLIENT");
448 		if (err)
449 			return err;
450 	}
451 
452 	return NULL;
453 }
454 
455 static const struct got_error *
456 send_info(struct gotd_client *client)
457 {
458 	const struct got_error *err = NULL;
459 	struct gotd_imsg_info info;
460 	uint64_t slot;
461 	struct gotd_repo *repo;
462 
463 	if (client->euid != 0)
464 		return got_error_set_errno(EPERM, "info");
465 
466 	info.pid = gotd.pid;
467 	info.verbosity = gotd.verbosity;
468 	info.nrepos = gotd.nrepos;
469 	info.nclients = client_cnt - 1;
470 
471 	if (gotd_imsg_compose_event(&client->iev, GOTD_IMSG_INFO, PROC_GOTD, -1,
472 	    &info, sizeof(info)) == -1) {
473 		err = got_error_from_errno("imsg compose INFO");
474 		if (err)
475 			return err;
476 	}
477 
478 	TAILQ_FOREACH(repo, &gotd.repos, entry) {
479 		err = send_repo_info(&client->iev, repo);
480 		if (err)
481 			return err;
482 	}
483 
484 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
485 		struct gotd_client *c;
486 		STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
487 			if (c->id == client->id)
488 				continue;
489 			err = send_client_info(&client->iev, c);
490 			if (err)
491 				return err;
492 		}
493 	}
494 
495 	return NULL;
496 }
497 
498 static const struct got_error *
499 stop_gotd(struct gotd_client *client)
500 {
501 
502 	if (client->euid != 0)
503 		return got_error_set_errno(EPERM, "stop");
504 
505 	gotd_shutdown();
506 	/* NOTREACHED */
507 	return NULL;
508 }
509 
510 static const struct got_error *
511 start_client_authentication(struct gotd_client *client, struct imsg *imsg)
512 {
513 	const struct got_error *err;
514 	struct gotd_imsg_list_refs ireq;
515 	struct gotd_repo *repo = NULL;
516 	size_t datalen;
517 
518 	log_debug("list-refs request from uid %d", client->euid);
519 
520 	if (client->state != GOTD_CLIENT_STATE_NEW)
521 		return got_error_msg(GOT_ERR_BAD_REQUEST,
522 		    "unexpected list-refs request received");
523 
524 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
525 	if (datalen != sizeof(ireq))
526 		return got_error(GOT_ERR_PRIVSEP_LEN);
527 
528 	memcpy(&ireq, imsg->data, datalen);
529 
530 	if (ireq.client_is_reading) {
531 		err = ensure_client_is_not_writing(client);
532 		if (err)
533 			return err;
534 		repo = gotd_find_repo_by_name(ireq.repo_name, &gotd);
535 		if (repo == NULL)
536 			return got_error(GOT_ERR_NOT_GIT_REPO);
537 		err = start_auth_child(client, GOTD_AUTH_READ, repo,
538 		    gotd.argv0, gotd.confpath, gotd.daemonize,
539 		    gotd.verbosity);
540 		if (err)
541 			return err;
542 	} else {
543 		err = ensure_client_is_not_reading(client);
544 		if (err)
545 			return err;
546 		repo = gotd_find_repo_by_name(ireq.repo_name, &gotd);
547 		if (repo == NULL)
548 			return got_error(GOT_ERR_NOT_GIT_REPO);
549 		err = start_auth_child(client,
550 		    GOTD_AUTH_READ | GOTD_AUTH_WRITE,
551 		    repo, gotd.argv0, gotd.confpath, gotd.daemonize,
552 		    gotd.verbosity);
553 		if (err)
554 			return err;
555 	}
556 
557 	evtimer_add(&client->tmo, &auth_timeout);
558 
559 	/* Flow continues upon authentication success/failure or timeout. */
560 	return NULL;
561 }
562 
563 static void
564 gotd_request(int fd, short events, void *arg)
565 {
566 	struct gotd_imsgev *iev = arg;
567 	struct imsgbuf *ibuf = &iev->ibuf;
568 	struct gotd_client *client = iev->handler_arg;
569 	const struct got_error *err = NULL;
570 	struct imsg imsg;
571 	ssize_t n;
572 
573 	if (events & EV_WRITE) {
574 		while (ibuf->w.queued) {
575 			n = msgbuf_write(&ibuf->w);
576 			if (n == -1 && errno == EPIPE) {
577 				/*
578 				 * The client has closed its socket.
579 				 * This can happen when Git clients are
580 				 * done sending pack file data.
581 				 */
582 				msgbuf_clear(&ibuf->w);
583 				continue;
584 			} else if (n == -1 && errno != EAGAIN) {
585 				err = got_error_from_errno("imsg_flush");
586 				disconnect_on_error(client, err);
587 				return;
588 			}
589 			if (n == 0) {
590 				/* Connection closed. */
591 				err = got_error(GOT_ERR_EOF);
592 				disconnect_on_error(client, err);
593 				return;
594 			}
595 		}
596 
597 		/* Disconnect gotctl(8) now that messages have been sent. */
598 		if (!client_is_reading(client) && !client_is_writing(client)) {
599 			disconnect(client);
600 			return;
601 		}
602 	}
603 
604 	if ((events & EV_READ) == 0)
605 		return;
606 
607 	memset(&imsg, 0, sizeof(imsg));
608 
609 	while (err == NULL) {
610 		err = gotd_imsg_recv(&imsg, ibuf, 0);
611 		if (err) {
612 			if (err->code == GOT_ERR_PRIVSEP_READ)
613 				err = NULL;
614 			break;
615 		}
616 
617 		evtimer_del(&client->tmo);
618 
619 		switch (imsg.hdr.type) {
620 		case GOTD_IMSG_INFO:
621 			err = send_info(client);
622 			break;
623 		case GOTD_IMSG_STOP:
624 			err = stop_gotd(client);
625 			break;
626 		case GOTD_IMSG_LIST_REFS:
627 			err = start_client_authentication(client, &imsg);
628 			break;
629 		default:
630 			log_debug("unexpected imsg %d", imsg.hdr.type);
631 			err = got_error(GOT_ERR_PRIVSEP_MSG);
632 			break;
633 		}
634 
635 		imsg_free(&imsg);
636 	}
637 
638 	if (err) {
639 		disconnect_on_error(client, err);
640 	} else {
641 		gotd_imsg_event_add(&client->iev);
642 	}
643 }
644 
645 static void
646 gotd_auth_timeout(int fd, short events, void *arg)
647 {
648 	struct gotd_client *client = arg;
649 
650 	log_debug("disconnecting uid %d due to authentication timeout",
651 	    client->euid);
652 	disconnect(client);
653 }
654 
655 static const struct got_error *
656 recv_connect(uint32_t *client_id, struct imsg *imsg)
657 {
658 	const struct got_error *err = NULL;
659 	struct gotd_imsg_connect iconnect;
660 	size_t datalen;
661 	int s = -1;
662 	struct gotd_client *client = NULL;
663 
664 	*client_id = 0;
665 
666 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
667 	if (datalen != sizeof(iconnect))
668 		return got_error(GOT_ERR_PRIVSEP_LEN);
669 	memcpy(&iconnect, imsg->data, sizeof(iconnect));
670 
671 	s = imsg->fd;
672 	if (s == -1) {
673 		err = got_error(GOT_ERR_PRIVSEP_NO_FD);
674 		goto done;
675 	}
676 
677 	if (find_client(iconnect.client_id)) {
678 		err = got_error_msg(GOT_ERR_CLIENT_ID, "duplicate client ID");
679 		goto done;
680 	}
681 
682 	client = calloc(1, sizeof(*client));
683 	if (client == NULL) {
684 		err = got_error_from_errno("calloc");
685 		goto done;
686 	}
687 
688 	*client_id = iconnect.client_id;
689 
690 	client->state = GOTD_CLIENT_STATE_NEW;
691 	client->id = iconnect.client_id;
692 	client->fd = s;
693 	s = -1;
694 	/* The auth process will verify UID/GID for us. */
695 	client->euid = iconnect.euid;
696 	client->egid = iconnect.egid;
697 
698 	imsg_init(&client->iev.ibuf, client->fd);
699 	client->iev.handler = gotd_request;
700 	client->iev.events = EV_READ;
701 	client->iev.handler_arg = client;
702 
703 	event_set(&client->iev.ev, client->fd, EV_READ, gotd_request,
704 	    &client->iev);
705 	gotd_imsg_event_add(&client->iev);
706 
707 	evtimer_set(&client->tmo, gotd_auth_timeout, client);
708 
709 	add_client(client);
710 	log_debug("%s: new client uid %d connected on fd %d", __func__,
711 	    client->euid, client->fd);
712 done:
713 	if (err) {
714 		struct gotd_child_proc *listen_proc = gotd.listen_proc;
715 		struct gotd_imsg_disconnect idisconnect;
716 
717 		idisconnect.client_id = client->id;
718 		if (gotd_imsg_compose_event(&listen_proc->iev,
719 		    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
720 		    &idisconnect, sizeof(idisconnect)) == -1)
721 			log_warn("imsg compose DISCONNECT");
722 
723 		if (s != -1)
724 			close(s);
725 	}
726 
727 	return err;
728 }
729 
730 static const char *gotd_proc_names[PROC_MAX] = {
731 	"parent",
732 	"listen",
733 	"auth",
734 	"session_read",
735 	"session_write",
736 	"repo_read",
737 	"repo_write",
738 	"gitwrapper"
739 };
740 
741 static void
742 kill_proc(struct gotd_child_proc *proc, int fatal)
743 {
744 	struct timeval tv = { 5, 0 };
745 
746 	log_debug("kill -%d %d", fatal ? SIGKILL : SIGTERM, proc->pid);
747 
748 	if (proc->iev.ibuf.fd != -1) {
749 		event_del(&proc->iev.ev);
750 		msgbuf_clear(&proc->iev.ibuf.w);
751 		close(proc->iev.ibuf.fd);
752 		proc->iev.ibuf.fd = -1;
753 	}
754 
755 	if (!evtimer_pending(&proc->tmo, NULL) && !fatal)
756 		evtimer_add(&proc->tmo, &tv);
757 
758 	if (fatal) {
759 		log_warnx("sending SIGKILL to PID %d", proc->pid);
760 		kill(proc->pid, SIGKILL);
761 	} else
762 		kill(proc->pid, SIGTERM);
763 }
764 
765 static void
766 kill_proc_timeout(int fd, short ev, void *d)
767 {
768 	struct gotd_child_proc *proc = d;
769 
770 	log_warnx("timeout waiting for PID %d to terminate;"
771 	    " retrying with force", proc->pid);
772 	kill_proc(proc, 1);
773 }
774 
775 static void
776 gotd_shutdown(void)
777 {
778 	uint64_t slot;
779 
780 	log_debug("shutting down");
781 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
782 		struct gotd_client *c, *tmp;
783 
784 		STAILQ_FOREACH_SAFE(c, &gotd_clients[slot], entry, tmp)
785 			disconnect(c);
786 	}
787 
788 	kill_proc(gotd.listen_proc, 0);
789 
790 	log_info("terminating");
791 	exit(0);
792 }
793 
794 static struct gotd_child_proc *
795 find_proc_by_pid(pid_t pid)
796 {
797 	struct gotd_child_proc *proc = NULL;
798 
799 	TAILQ_FOREACH(proc, &procs, entry)
800 		if (proc->pid == pid)
801 			break;
802 
803 	return proc;
804 }
805 
806 void
807 gotd_sighdlr(int sig, short event, void *arg)
808 {
809 	struct gotd_child_proc *proc;
810 	pid_t pid;
811 	int status;
812 
813 	/*
814 	 * Normal signal handler rules don't apply because libevent
815 	 * decouples for us.
816 	 */
817 
818 	switch (sig) {
819 	case SIGHUP:
820 		log_info("%s: ignoring SIGHUP", __func__);
821 		break;
822 	case SIGUSR1:
823 		log_info("%s: ignoring SIGUSR1", __func__);
824 		break;
825 	case SIGTERM:
826 	case SIGINT:
827 		gotd_shutdown();
828 		break;
829 	case SIGCHLD:
830 		for (;;) {
831 			pid = waitpid(WAIT_ANY, &status, WNOHANG);
832 			if (pid == -1) {
833 				if (errno == EINTR)
834 					continue;
835 				if (errno == ECHILD)
836 					break;
837 				fatal("waitpid");
838 			}
839 			if (pid == 0)
840 				break;
841 
842 			log_debug("reaped pid %d", pid);
843 			proc = find_proc_by_pid(pid);
844 			if (proc == NULL) {
845 				log_info("caught exit of unknown child %d",
846 				    pid);
847 				continue;
848 			}
849 
850 			if (WIFSIGNALED(status)) {
851 				log_warnx("child PID %d terminated with"
852 				    " signal %d", pid, WTERMSIG(status));
853 			}
854 
855 			proc_done(proc);
856 		}
857 		break;
858 	default:
859 		fatalx("unexpected signal");
860 	}
861 }
862 
863 static const struct got_error *
864 ensure_proc_is_reading(struct gotd_client *client,
865     struct gotd_child_proc *proc)
866 {
867 	if (!client_is_reading(client)) {
868 		kill_proc(proc, 1);
869 		return got_error_fmt(GOT_ERR_BAD_PACKET,
870 		    "PID %d handled a read-request for uid %d but this "
871 		    "user is not reading from a repository", proc->pid,
872 		    client->euid);
873 	}
874 
875 	return NULL;
876 }
877 
878 static const struct got_error *
879 ensure_proc_is_writing(struct gotd_client *client,
880     struct gotd_child_proc *proc)
881 {
882 	if (!client_is_writing(client)) {
883 		kill_proc(proc, 1);
884 		return got_error_fmt(GOT_ERR_BAD_PACKET,
885 		    "PID %d handled a write-request for uid %d but this "
886 		    "user is not writing to a repository", proc->pid,
887 		    client->euid);
888 	}
889 
890 	return NULL;
891 }
892 
893 static int
894 verify_imsg_src(struct gotd_client *client, struct gotd_child_proc *proc,
895     struct imsg *imsg)
896 {
897 	const struct got_error *err;
898 	int ret = 0;
899 
900 	if (proc->type == PROC_REPO_READ || proc->type == PROC_REPO_WRITE) {
901 		if (client->repo == NULL)
902 			fatalx("no process found for uid %d", client->euid);
903 		if (proc->pid != client->repo->pid) {
904 			kill_proc(proc, 1);
905 			log_warnx("received message from PID %d for uid %d, "
906 			    "while PID %d is the process serving this user",
907 			    proc->pid, client->euid, client->repo->pid);
908 			return 0;
909 		}
910 	}
911 	if (proc->type == PROC_SESSION_READ ||
912 	    proc->type == PROC_SESSION_WRITE) {
913 		if (client->session == NULL) {
914 			log_warnx("no session found for uid %d", client->euid);
915 			return 0;
916 		}
917 		if (proc->pid != client->session->pid) {
918 			kill_proc(proc, 1);
919 			log_warnx("received message from PID %d for uid %d, "
920 			    "while PID %d is the process serving this user",
921 			    proc->pid, client->euid, client->session->pid);
922 			return 0;
923 		}
924 	}
925 
926 	switch (imsg->hdr.type) {
927 	case GOTD_IMSG_ERROR:
928 		ret = 1;
929 		break;
930 	case GOTD_IMSG_CONNECT:
931 		if (proc->type != PROC_LISTEN) {
932 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
933 			    "new connection for uid %d from PID %d "
934 			    "which is not the listen process",
935 			    client->euid, proc->pid);
936 		} else
937 			ret = 1;
938 		break;
939 	case GOTD_IMSG_ACCESS_GRANTED:
940 		if (proc->type != PROC_AUTH) {
941 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
942 			    "authentication of uid %d from PID %d "
943 			    "which is not the auth process",
944 			    client->euid, proc->pid);
945 		} else
946 			ret = 1;
947 		break;
948 	case GOTD_IMSG_CLIENT_SESSION_READY:
949 		if (proc->type != PROC_SESSION_READ &&
950 		    proc->type != PROC_SESSION_WRITE) {
951 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
952 			    "unexpected \"ready\" signal from PID %d",
953 			    proc->pid);
954 		} else
955 			ret = 1;
956 		break;
957 	case GOTD_IMSG_REPO_CHILD_READY:
958 		if (proc->type != PROC_REPO_READ &&
959 		    proc->type != PROC_REPO_WRITE) {
960 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
961 			    "unexpected \"ready\" signal from PID %d",
962 			    proc->pid);
963 		} else
964 			ret = 1;
965 		break;
966 	case GOTD_IMSG_PACKFILE_DONE:
967 		err = ensure_proc_is_reading(client, proc);
968 		if (err)
969 			log_warnx("uid %d: %s", client->euid, err->msg);
970 		else
971 			ret = 1;
972 		break;
973 	case GOTD_IMSG_PACKFILE_INSTALL:
974 	case GOTD_IMSG_REF_UPDATES_START:
975 	case GOTD_IMSG_REF_UPDATE:
976 		err = ensure_proc_is_writing(client, proc);
977 		if (err)
978 			log_warnx("uid %d: %s", client->euid, err->msg);
979 		else
980 			ret = 1;
981 		break;
982 	default:
983 		log_debug("%s: unexpected imsg %d", __func__, imsg->hdr.type);
984 		break;
985 	}
986 
987 	return ret;
988 }
989 
990 static const struct got_error *
991 connect_repo_child(struct gotd_client *client,
992     struct gotd_child_proc *repo_proc)
993 {
994 	static const struct got_error *err;
995 	struct gotd_imsgev *session_iev = &client->session->iev;
996 	struct gotd_imsg_connect_repo_child ireq;
997 	int pipe[2];
998 
999 	if (client->state != GOTD_CLIENT_STATE_ACCESS_GRANTED)
1000 		return got_error_msg(GOT_ERR_BAD_REQUEST,
1001 		    "unexpected repo child ready signal received");
1002 
1003 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1004 	    PF_UNSPEC, pipe) == -1)
1005 		fatal("socketpair");
1006 
1007 	memset(&ireq, 0, sizeof(ireq));
1008 	ireq.client_id = client->id;
1009 	ireq.proc_id = repo_proc->type;
1010 
1011 	/* Pass repo child pipe to session child process. */
1012 	if (gotd_imsg_compose_event(session_iev, GOTD_IMSG_CONNECT_REPO_CHILD,
1013 	    PROC_GOTD, pipe[0], &ireq, sizeof(ireq)) == -1) {
1014 		err = got_error_from_errno("imsg compose CONNECT_REPO_CHILD");
1015 		close(pipe[0]);
1016 		close(pipe[1]);
1017 		return err;
1018 	}
1019 
1020 	/* Pass session child pipe to repo child process. */
1021 	if (gotd_imsg_compose_event(&repo_proc->iev,
1022 	    GOTD_IMSG_CONNECT_REPO_CHILD, PROC_GOTD, pipe[1], NULL, 0) == -1) {
1023 		err = got_error_from_errno("imsg compose CONNECT_REPO_CHILD");
1024 		close(pipe[1]);
1025 		return err;
1026 	}
1027 
1028 	return NULL;
1029 }
1030 
1031 static void
1032 gotd_dispatch_listener(int fd, short event, void *arg)
1033 {
1034 	struct gotd_imsgev *iev = arg;
1035 	struct imsgbuf *ibuf = &iev->ibuf;
1036 	struct gotd_child_proc *proc = gotd.listen_proc;
1037 	ssize_t n;
1038 	int shut = 0;
1039 	struct imsg imsg;
1040 
1041 	if (proc->iev.ibuf.fd != fd)
1042 		fatalx("%s: unexpected fd %d", __func__, fd);
1043 
1044 	if (event & EV_READ) {
1045 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1046 			fatal("imsg_read error");
1047 		if (n == 0) {
1048 			/* Connection closed. */
1049 			shut = 1;
1050 			goto done;
1051 		}
1052 	}
1053 
1054 	if (event & EV_WRITE) {
1055 		n = msgbuf_write(&ibuf->w);
1056 		if (n == -1 && errno != EAGAIN)
1057 			fatal("msgbuf_write");
1058 		if (n == 0) {
1059 			/* Connection closed. */
1060 			shut = 1;
1061 			goto done;
1062 		}
1063 	}
1064 
1065 	for (;;) {
1066 		const struct got_error *err = NULL;
1067 		struct gotd_client *client = NULL;
1068 		uint32_t client_id = 0;
1069 		int do_disconnect = 0;
1070 
1071 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1072 			fatal("%s: imsg_get error", __func__);
1073 		if (n == 0)	/* No more messages. */
1074 			break;
1075 
1076 		switch (imsg.hdr.type) {
1077 		case GOTD_IMSG_ERROR:
1078 			do_disconnect = 1;
1079 			err = gotd_imsg_recv_error(&client_id, &imsg);
1080 			break;
1081 		case GOTD_IMSG_CONNECT:
1082 			err = recv_connect(&client_id, &imsg);
1083 			break;
1084 		default:
1085 			log_debug("unexpected imsg %d", imsg.hdr.type);
1086 			break;
1087 		}
1088 
1089 		client = find_client(client_id);
1090 		if (client == NULL) {
1091 			log_warnx("%s: client not found", __func__);
1092 			imsg_free(&imsg);
1093 			continue;
1094 		}
1095 
1096 		if (err)
1097 			log_warnx("uid %d: %s", client->euid, err->msg);
1098 
1099 		if (do_disconnect) {
1100 			if (err)
1101 				disconnect_on_error(client, err);
1102 			else
1103 				disconnect(client);
1104 		}
1105 
1106 		imsg_free(&imsg);
1107 	}
1108 done:
1109 	if (!shut) {
1110 		gotd_imsg_event_add(iev);
1111 	} else {
1112 		/* This pipe is dead. Remove its event handler */
1113 		event_del(&iev->ev);
1114 		event_loopexit(NULL);
1115 	}
1116 }
1117 
1118 static void
1119 gotd_dispatch_auth_child(int fd, short event, void *arg)
1120 {
1121 	const struct got_error *err = NULL;
1122 	struct gotd_imsgev *iev = arg;
1123 	struct imsgbuf *ibuf = &iev->ibuf;
1124 	struct gotd_client *client;
1125 	struct gotd_repo *repo = NULL;
1126 	ssize_t n;
1127 	int shut = 0;
1128 	struct imsg imsg;
1129 	uint32_t client_id = 0;
1130 	int do_disconnect = 0;
1131 	size_t datalen;
1132 
1133 	client = find_client_by_proc_fd(fd);
1134 	if (client == NULL) {
1135 		/* Can happen during process teardown. */
1136 		warnx("cannot find client for fd %d", fd);
1137 		shut = 1;
1138 		goto done;
1139 	}
1140 
1141 	if (client->auth == NULL)
1142 		fatalx("cannot find auth child process for fd %d", fd);
1143 
1144 	if (event & EV_READ) {
1145 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1146 			fatal("imsg_read error");
1147 		if (n == 0) {
1148 			/* Connection closed. */
1149 			shut = 1;
1150 			goto done;
1151 		}
1152 	}
1153 
1154 	if (event & EV_WRITE) {
1155 		n = msgbuf_write(&ibuf->w);
1156 		if (n == -1 && errno != EAGAIN)
1157 			fatal("msgbuf_write");
1158 		if (n == 0) {
1159 			/* Connection closed. */
1160 			shut = 1;
1161 		}
1162 		goto done;
1163 	}
1164 
1165 	if (client->auth->iev.ibuf.fd != fd)
1166 		fatalx("%s: unexpected fd %d", __func__, fd);
1167 
1168 	if ((n = imsg_get(ibuf, &imsg)) == -1)
1169 		fatal("%s: imsg_get error", __func__);
1170 	if (n == 0)	/* No more messages. */
1171 		return;
1172 
1173 	evtimer_del(&client->tmo);
1174 
1175 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1176 
1177 	switch (imsg.hdr.type) {
1178 	case GOTD_IMSG_ERROR:
1179 		do_disconnect = 1;
1180 		err = gotd_imsg_recv_error(&client_id, &imsg);
1181 		break;
1182 	case GOTD_IMSG_ACCESS_GRANTED:
1183 		if (client->state != GOTD_CLIENT_STATE_NEW) {
1184 			do_disconnect = 1;
1185 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1186 		}
1187 		break;
1188 	default:
1189 		do_disconnect = 1;
1190 		log_debug("unexpected imsg %d", imsg.hdr.type);
1191 		break;
1192 	}
1193 
1194 	if (!verify_imsg_src(client, client->auth, &imsg)) {
1195 		do_disconnect = 1;
1196 		log_debug("dropping imsg type %d from PID %d",
1197 		    imsg.hdr.type, client->auth->pid);
1198 	}
1199 
1200 	if (do_disconnect) {
1201 		if (err)
1202 			disconnect_on_error(client, err);
1203 		else
1204 			disconnect(client);
1205 		imsg_free(&imsg);
1206 		return;
1207 	}
1208 
1209 	client->state = GOTD_CLIENT_STATE_ACCESS_GRANTED;
1210 	if (datalen > 0)
1211 		client->username = strndup(imsg.data, datalen);
1212 	imsg_free(&imsg);
1213 	if (client->username == NULL &&
1214 	    asprintf(&client->username, "uid %d", client->euid) == -1) {
1215 		err = got_error_from_errno("asprintf");
1216 		goto done;
1217 	}
1218 
1219 	repo = gotd_find_repo_by_name(client->auth->repo_name, &gotd);
1220 	if (repo == NULL) {
1221 		err = got_error(GOT_ERR_NOT_GIT_REPO);
1222 		goto done;
1223 	}
1224 	kill_auth_proc(client);
1225 
1226 	log_info("authenticated %s for repository %s",
1227 	    client->username, repo->name);
1228 
1229 	err = start_session_child(client, repo, gotd.argv0,
1230 	    gotd.confpath, gotd.daemonize, gotd.verbosity);
1231 	if (err)
1232 		goto done;
1233 done:
1234 	if (err)
1235 		log_warnx("uid %d: %s", client->euid, err->msg);
1236 
1237 	/* We might have killed the auth process by now. */
1238 	if (client->auth != NULL) {
1239 		if (!shut) {
1240 			gotd_imsg_event_add(iev);
1241 		} else {
1242 			/* This pipe is dead. Remove its event handler */
1243 			event_del(&iev->ev);
1244 		}
1245 	}
1246 }
1247 
1248 static const struct got_error *
1249 connect_session(struct gotd_client *client)
1250 {
1251 	const struct got_error *err = NULL;
1252 	struct gotd_imsg_connect iconnect;
1253 	int s;
1254 
1255 	memset(&iconnect, 0, sizeof(iconnect));
1256 
1257 	s = dup(client->fd);
1258 	if (s == -1)
1259 		return got_error_from_errno("dup");
1260 
1261 	iconnect.client_id = client->id;
1262 	iconnect.euid = client->euid;
1263 	iconnect.egid = client->egid;
1264 
1265 	if (gotd_imsg_compose_event(&client->session->iev, GOTD_IMSG_CONNECT,
1266 	    PROC_GOTD, s, &iconnect, sizeof(iconnect)) == -1) {
1267 		err = got_error_from_errno("imsg compose CONNECT");
1268 		close(s);
1269 		return err;
1270 	}
1271 
1272 	/*
1273 	 * We are no longer interested in messages from this client.
1274 	 * Further client requests will be handled by the session process.
1275 	 */
1276 	msgbuf_clear(&client->iev.ibuf.w);
1277 	imsg_clear(&client->iev.ibuf);
1278 	event_del(&client->iev.ev);
1279 	client->fd = -1; /* will be closed via copy in client->iev.ibuf.fd */
1280 
1281 	return NULL;
1282 }
1283 
1284 static void
1285 gotd_dispatch_client_session(int fd, short event, void *arg)
1286 {
1287 	struct gotd_imsgev *iev = arg;
1288 	struct imsgbuf *ibuf = &iev->ibuf;
1289 	struct gotd_child_proc *proc = NULL;
1290 	struct gotd_client *client = NULL;
1291 	ssize_t n;
1292 	int shut = 0;
1293 	struct imsg imsg;
1294 
1295 	client = find_client_by_proc_fd(fd);
1296 	if (client == NULL) {
1297 		/* Can happen during process teardown. */
1298 		warnx("cannot find client for fd %d", fd);
1299 		shut = 1;
1300 		goto done;
1301 	}
1302 
1303 	if (event & EV_READ) {
1304 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1305 			fatal("imsg_read error");
1306 		if (n == 0) {
1307 			/* Connection closed. */
1308 			shut = 1;
1309 			goto done;
1310 		}
1311 	}
1312 
1313 	if (event & EV_WRITE) {
1314 		n = msgbuf_write(&ibuf->w);
1315 		if (n == -1 && errno != EAGAIN)
1316 			fatal("msgbuf_write");
1317 		if (n == 0) {
1318 			/* Connection closed. */
1319 			shut = 1;
1320 			goto done;
1321 		}
1322 	}
1323 
1324 	proc = client->session;
1325 	if (proc == NULL)
1326 		fatalx("cannot find session child process for fd %d", fd);
1327 
1328 	for (;;) {
1329 		const struct got_error *err = NULL;
1330 		uint32_t client_id = 0;
1331 		int do_disconnect = 0, do_start_repo_child = 0;
1332 
1333 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1334 			fatal("%s: imsg_get error", __func__);
1335 		if (n == 0)	/* No more messages. */
1336 			break;
1337 
1338 		switch (imsg.hdr.type) {
1339 		case GOTD_IMSG_ERROR:
1340 			do_disconnect = 1;
1341 			err = gotd_imsg_recv_error(&client_id, &imsg);
1342 			break;
1343 		case GOTD_IMSG_CLIENT_SESSION_READY:
1344 			if (client->state != GOTD_CLIENT_STATE_ACCESS_GRANTED) {
1345 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1346 				break;
1347 			}
1348 			do_start_repo_child = 1;
1349 			break;
1350 		case GOTD_IMSG_DISCONNECT:
1351 			do_disconnect = 1;
1352 			break;
1353 		default:
1354 			log_debug("unexpected imsg %d", imsg.hdr.type);
1355 			break;
1356 		}
1357 
1358 		if (!verify_imsg_src(client, proc, &imsg)) {
1359 			log_debug("dropping imsg type %d from PID %d",
1360 			    imsg.hdr.type, proc->pid);
1361 			imsg_free(&imsg);
1362 			continue;
1363 		}
1364 		if (err)
1365 			log_warnx("uid %d: %s", client->euid, err->msg);
1366 
1367 		if (do_start_repo_child) {
1368 			struct gotd_repo *repo;
1369 			const char *name = client->session->repo_name;
1370 
1371 			repo = gotd_find_repo_by_name(name, &gotd);
1372 			if (repo != NULL) {
1373 				enum gotd_procid proc_type;
1374 
1375 				if (client->required_auth & GOTD_AUTH_WRITE)
1376 					proc_type = PROC_REPO_WRITE;
1377 				else
1378 					proc_type = PROC_REPO_READ;
1379 
1380 				err = start_repo_child(client, proc_type, repo,
1381 				    gotd.argv0, gotd.confpath, gotd.daemonize,
1382 				    gotd.verbosity);
1383 			} else
1384 				err = got_error(GOT_ERR_NOT_GIT_REPO);
1385 
1386 			if (err) {
1387 				log_warnx("uid %d: %s", client->euid, err->msg);
1388 				do_disconnect = 1;
1389 			}
1390 		}
1391 
1392 		if (do_disconnect) {
1393 			if (err)
1394 				disconnect_on_error(client, err);
1395 			else
1396 				disconnect(client);
1397 		}
1398 
1399 		imsg_free(&imsg);
1400 	}
1401 done:
1402 	if (!shut) {
1403 		gotd_imsg_event_add(iev);
1404 	} else {
1405 		/* This pipe is dead. Remove its event handler */
1406 		event_del(&iev->ev);
1407 		disconnect(client);
1408 	}
1409 }
1410 
1411 static void
1412 gotd_dispatch_repo_child(int fd, short event, void *arg)
1413 {
1414 	struct gotd_imsgev *iev = arg;
1415 	struct imsgbuf *ibuf = &iev->ibuf;
1416 	struct gotd_child_proc *proc = NULL;
1417 	struct gotd_client *client;
1418 	ssize_t n;
1419 	int shut = 0;
1420 	struct imsg imsg;
1421 
1422 	client = find_client_by_proc_fd(fd);
1423 	if (client == NULL) {
1424 		/* Can happen during process teardown. */
1425 		warnx("cannot find client for fd %d", fd);
1426 		shut = 1;
1427 		goto done;
1428 	}
1429 
1430 	if (event & EV_READ) {
1431 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1432 			fatal("imsg_read error");
1433 		if (n == 0) {
1434 			/* Connection closed. */
1435 			shut = 1;
1436 			goto done;
1437 		}
1438 	}
1439 
1440 	if (event & EV_WRITE) {
1441 		n = msgbuf_write(&ibuf->w);
1442 		if (n == -1 && errno != EAGAIN)
1443 			fatal("msgbuf_write");
1444 		if (n == 0) {
1445 			/* Connection closed. */
1446 			shut = 1;
1447 			goto done;
1448 		}
1449 	}
1450 
1451 	proc = client->repo;
1452 	if (proc == NULL)
1453 		fatalx("cannot find child process for fd %d", fd);
1454 
1455 	for (;;) {
1456 		const struct got_error *err = NULL;
1457 		uint32_t client_id = 0;
1458 		int do_disconnect = 0;
1459 
1460 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1461 			fatal("%s: imsg_get error", __func__);
1462 		if (n == 0)	/* No more messages. */
1463 			break;
1464 
1465 		switch (imsg.hdr.type) {
1466 		case GOTD_IMSG_ERROR:
1467 			do_disconnect = 1;
1468 			err = gotd_imsg_recv_error(&client_id, &imsg);
1469 			break;
1470 		case GOTD_IMSG_REPO_CHILD_READY:
1471 			err = connect_session(client);
1472 			if (err)
1473 				break;
1474 			err = connect_repo_child(client, proc);
1475 			break;
1476 		default:
1477 			log_debug("unexpected imsg %d", imsg.hdr.type);
1478 			break;
1479 		}
1480 
1481 		if (!verify_imsg_src(client, proc, &imsg)) {
1482 			log_debug("dropping imsg type %d from PID %d",
1483 			    imsg.hdr.type, proc->pid);
1484 			imsg_free(&imsg);
1485 			continue;
1486 		}
1487 		if (err)
1488 			log_warnx("uid %d: %s", client->euid, err->msg);
1489 
1490 		if (do_disconnect) {
1491 			if (err)
1492 				disconnect_on_error(client, err);
1493 			else
1494 				disconnect(client);
1495 		}
1496 
1497 		imsg_free(&imsg);
1498 	}
1499 done:
1500 	if (!shut) {
1501 		gotd_imsg_event_add(iev);
1502 	} else {
1503 		/* This pipe is dead. Remove its event handler */
1504 		event_del(&iev->ev);
1505 		disconnect(client);
1506 	}
1507 }
1508 
1509 static pid_t
1510 start_child(enum gotd_procid proc_id, const char *repo_path,
1511     char *argv0, const char *confpath, int fd, int daemonize, int verbosity)
1512 {
1513 	char	*argv[11];
1514 	int	 argc = 0;
1515 	pid_t	 pid;
1516 
1517 	switch (pid = fork()) {
1518 	case -1:
1519 		fatal("cannot fork");
1520 	case 0:
1521 		break;
1522 	default:
1523 		close(fd);
1524 		return pid;
1525 	}
1526 
1527 	if (fd != GOTD_FILENO_MSG_PIPE) {
1528 		if (dup2(fd, GOTD_FILENO_MSG_PIPE) == -1)
1529 			fatal("cannot setup imsg fd");
1530 	} else if (fcntl(fd, F_SETFD, 0) == -1)
1531 		fatal("cannot setup imsg fd");
1532 
1533 	argv[argc++] = argv0;
1534 	switch (proc_id) {
1535 	case PROC_LISTEN:
1536 		argv[argc++] = (char *)"-L";
1537 		break;
1538 	case PROC_AUTH:
1539 		argv[argc++] = (char *)"-A";
1540 		break;
1541 	case PROC_SESSION_READ:
1542 		argv[argc++] = (char *)"-s";
1543 		break;
1544 	case PROC_SESSION_WRITE:
1545 		argv[argc++] = (char *)"-S";
1546 		break;
1547 	case PROC_REPO_READ:
1548 		argv[argc++] = (char *)"-R";
1549 		break;
1550 	case PROC_REPO_WRITE:
1551 		argv[argc++] = (char *)"-W";
1552 		break;
1553 	default:
1554 		fatalx("invalid process id %d", proc_id);
1555 	}
1556 
1557 	argv[argc++] = (char *)"-f";
1558 	argv[argc++] = (char *)confpath;
1559 
1560 	if (repo_path) {
1561 		argv[argc++] = (char *)"-P";
1562 		argv[argc++] = (char *)repo_path;
1563 	}
1564 
1565 	if (!daemonize)
1566 		argv[argc++] = (char *)"-d";
1567 	if (verbosity > 0)
1568 		argv[argc++] = (char *)"-v";
1569 	if (verbosity > 1)
1570 		argv[argc++] = (char *)"-v";
1571 	argv[argc++] = NULL;
1572 
1573 	execvp(argv0, argv);
1574 	fatal("execvp");
1575 }
1576 
1577 static void
1578 start_listener(char *argv0, const char *confpath, int daemonize, int verbosity)
1579 {
1580 	struct gotd_child_proc *proc;
1581 
1582 	proc = calloc(1, sizeof(*proc));
1583 	if (proc == NULL)
1584 		fatal("calloc");
1585 
1586 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1587 
1588 	/* proc->tmo is initialized in main() after event_init() */
1589 
1590 	proc->type = PROC_LISTEN;
1591 
1592 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1593 	    PF_UNSPEC, proc->pipe) == -1)
1594 		fatal("socketpair");
1595 
1596 	proc->pid = start_child(proc->type, NULL, argv0, confpath,
1597 	    proc->pipe[1], daemonize, verbosity);
1598 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1599 	proc->iev.handler = gotd_dispatch_listener;
1600 	proc->iev.events = EV_READ;
1601 	proc->iev.handler_arg = NULL;
1602 
1603 	gotd.listen_proc = proc;
1604 }
1605 
1606 static const struct got_error *
1607 start_session_child(struct gotd_client *client, struct gotd_repo *repo,
1608     char *argv0, const char *confpath, int daemonize, int verbosity)
1609 {
1610 	struct gotd_child_proc *proc;
1611 
1612 	proc = calloc(1, sizeof(*proc));
1613 	if (proc == NULL)
1614 		return got_error_from_errno("calloc");
1615 
1616 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1617 	evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1618 
1619 	if (client_is_reading(client))
1620 		proc->type = PROC_SESSION_READ;
1621 	else
1622 		proc->type = PROC_SESSION_WRITE;
1623 	if (strlcpy(proc->repo_name, repo->name,
1624 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1625 		fatalx("repository name too long: %s", repo->name);
1626 	log_debug("starting client uid %d session for repository %s",
1627 	    client->euid, repo->name);
1628 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1629 	    sizeof(proc->repo_path))
1630 		fatalx("repository path too long: %s", repo->path);
1631 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1632 	    PF_UNSPEC, proc->pipe) == -1)
1633 		fatal("socketpair");
1634 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1635 	    confpath, proc->pipe[1], daemonize, verbosity);
1636 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1637 	log_debug("proc %s %s is on fd %d",
1638 	    gotd_proc_names[proc->type], proc->repo_path,
1639 	    proc->pipe[0]);
1640 	proc->iev.handler = gotd_dispatch_client_session;
1641 	proc->iev.events = EV_READ;
1642 	proc->iev.handler_arg = NULL;
1643 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1644 	    gotd_dispatch_client_session, &proc->iev);
1645 	gotd_imsg_event_add(&proc->iev);
1646 
1647 	client->session = proc;
1648 	return NULL;
1649 }
1650 
1651 static const struct got_error *
1652 start_repo_child(struct gotd_client *client, enum gotd_procid proc_type,
1653     struct gotd_repo *repo, char *argv0, const char *confpath,
1654     int daemonize, int verbosity)
1655 {
1656 	struct gotd_child_proc *proc;
1657 
1658 	if (proc_type != PROC_REPO_READ && proc_type != PROC_REPO_WRITE)
1659 		return got_error_msg(GOT_ERR_NOT_IMPL, "bad process type");
1660 
1661 	proc = calloc(1, sizeof(*proc));
1662 	if (proc == NULL)
1663 		return got_error_from_errno("calloc");
1664 
1665 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1666 	evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1667 
1668 	proc->type = proc_type;
1669 	if (strlcpy(proc->repo_name, repo->name,
1670 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1671 		fatalx("repository name too long: %s", repo->name);
1672 	log_debug("starting %s for repository %s",
1673 	    proc->type == PROC_REPO_READ ? "reader" : "writer", repo->name);
1674 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1675 	    sizeof(proc->repo_path))
1676 		fatalx("repository path too long: %s", repo->path);
1677 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1678 	    PF_UNSPEC, proc->pipe) == -1)
1679 		fatal("socketpair");
1680 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1681 	    confpath, proc->pipe[1], daemonize, verbosity);
1682 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1683 	log_debug("proc %s %s is on fd %d",
1684 	    gotd_proc_names[proc->type], proc->repo_path,
1685 	    proc->pipe[0]);
1686 	proc->iev.handler = gotd_dispatch_repo_child;
1687 	proc->iev.events = EV_READ;
1688 	proc->iev.handler_arg = NULL;
1689 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1690 	    gotd_dispatch_repo_child, &proc->iev);
1691 	gotd_imsg_event_add(&proc->iev);
1692 
1693 	client->repo = proc;
1694 	return NULL;
1695 }
1696 
1697 static const struct got_error *
1698 start_auth_child(struct gotd_client *client, int required_auth,
1699     struct gotd_repo *repo, char *argv0, const char *confpath,
1700     int daemonize, int verbosity)
1701 {
1702 	const struct got_error *err = NULL;
1703 	struct gotd_child_proc *proc;
1704 	struct gotd_imsg_auth iauth;
1705 	int fd;
1706 
1707 	memset(&iauth, 0, sizeof(iauth));
1708 
1709 	fd = dup(client->fd);
1710 	if (fd == -1)
1711 		return got_error_from_errno("dup");
1712 
1713 	proc = calloc(1, sizeof(*proc));
1714 	if (proc == NULL) {
1715 		err = got_error_from_errno("calloc");
1716 		close(fd);
1717 		return err;
1718 	}
1719 
1720 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1721 	evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1722 
1723 	proc->type = PROC_AUTH;
1724 	if (strlcpy(proc->repo_name, repo->name,
1725 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1726 		fatalx("repository name too long: %s", repo->name);
1727 	log_debug("starting auth for uid %d repository %s",
1728 	    client->euid, repo->name);
1729 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1730 	    sizeof(proc->repo_path))
1731 		fatalx("repository path too long: %s", repo->path);
1732 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1733 	    PF_UNSPEC, proc->pipe) == -1)
1734 		fatal("socketpair");
1735 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1736 	    confpath, proc->pipe[1], daemonize, verbosity);
1737 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1738 	log_debug("proc %s %s is on fd %d",
1739 	    gotd_proc_names[proc->type], proc->repo_path,
1740 	    proc->pipe[0]);
1741 	proc->iev.handler = gotd_dispatch_auth_child;
1742 	proc->iev.events = EV_READ;
1743 	proc->iev.handler_arg = NULL;
1744 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1745 	    gotd_dispatch_auth_child, &proc->iev);
1746 	gotd_imsg_event_add(&proc->iev);
1747 
1748 	iauth.euid = client->euid;
1749 	iauth.egid = client->egid;
1750 	iauth.required_auth = required_auth;
1751 	iauth.client_id = client->id;
1752 	if (gotd_imsg_compose_event(&proc->iev, GOTD_IMSG_AUTHENTICATE,
1753 	    PROC_GOTD, fd, &iauth, sizeof(iauth)) == -1) {
1754 		log_warn("imsg compose AUTHENTICATE");
1755 		close(fd);
1756 		/* Let the auth_timeout handler tidy up. */
1757 	}
1758 
1759 	client->auth = proc;
1760 	client->required_auth = required_auth;
1761 	return NULL;
1762 }
1763 
1764 static void
1765 apply_unveil_repo_readonly(const char *repo_path, int need_tmpdir)
1766 {
1767 	if (need_tmpdir) {
1768 		if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
1769 			fatal("unveil %s", GOT_TMPDIR_STR);
1770 	}
1771 
1772 	if (unveil(repo_path, "r") == -1)
1773 		fatal("unveil %s", repo_path);
1774 
1775 	if (unveil(NULL, NULL) == -1)
1776 		fatal("unveil");
1777 }
1778 
1779 static void
1780 apply_unveil_repo_readwrite(const char *repo_path)
1781 {
1782 	if (unveil(repo_path, "rwc") == -1)
1783 		fatal("unveil %s", repo_path);
1784 
1785 	if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
1786 		fatal("unveil %s", GOT_TMPDIR_STR);
1787 
1788 	if (unveil(NULL, NULL) == -1)
1789 		fatal("unveil");
1790 }
1791 
1792 static void
1793 apply_unveil_none(void)
1794 {
1795 	if (unveil("/", "") == -1)
1796 		fatal("unveil");
1797 
1798 	if (unveil(NULL, NULL) == -1)
1799 		fatal("unveil");
1800 }
1801 
1802 static void
1803 apply_unveil_selfexec(void)
1804 {
1805 	if (unveil(gotd.argv0, "x") == -1)
1806 		fatal("unveil %s", gotd.argv0);
1807 
1808 	if (unveil(NULL, NULL) == -1)
1809 		fatal("unveil");
1810 }
1811 
1812 static void
1813 set_max_datasize(void)
1814 {
1815 	struct rlimit rl;
1816 
1817 	if (getrlimit(RLIMIT_DATA, &rl) != 0)
1818 		return;
1819 
1820 	rl.rlim_cur = rl.rlim_max;
1821 	setrlimit(RLIMIT_DATA, &rl);
1822 }
1823 
1824 int
1825 main(int argc, char **argv)
1826 {
1827 	const struct got_error *error = NULL;
1828 	int ch, fd = -1, daemonize = 1, verbosity = 0, noaction = 0;
1829 	const char *confpath = GOTD_CONF_PATH;
1830 	char *argv0 = argv[0];
1831 	char title[2048];
1832 	struct passwd *pw = NULL;
1833 	char *repo_path = NULL;
1834 	enum gotd_procid proc_id = PROC_GOTD;
1835 	struct event evsigint, evsigterm, evsighup, evsigusr1, evsigchld;
1836 	int *pack_fds = NULL, *temp_fds = NULL;
1837 	struct gotd_repo *repo = NULL;
1838 
1839 	TAILQ_INIT(&procs);
1840 
1841 	log_init(1, LOG_DAEMON); /* Log to stderr until daemonized. */
1842 
1843 	while ((ch = getopt(argc, argv, "Adf:LnP:RsSvW")) != -1) {
1844 		switch (ch) {
1845 		case 'A':
1846 			proc_id = PROC_AUTH;
1847 			break;
1848 		case 'd':
1849 			daemonize = 0;
1850 			break;
1851 		case 'f':
1852 			confpath = optarg;
1853 			break;
1854 		case 'L':
1855 			proc_id = PROC_LISTEN;
1856 			break;
1857 		case 'n':
1858 			noaction = 1;
1859 			break;
1860 		case 'P':
1861 			repo_path = realpath(optarg, NULL);
1862 			if (repo_path == NULL)
1863 				fatal("realpath '%s'", optarg);
1864 			break;
1865 		case 'R':
1866 			proc_id = PROC_REPO_READ;
1867 			break;
1868 		case 's':
1869 			proc_id = PROC_SESSION_READ;
1870 			break;
1871 		case 'S':
1872 			proc_id = PROC_SESSION_WRITE;
1873 			break;
1874 		case 'v':
1875 			if (verbosity < 3)
1876 				verbosity++;
1877 			break;
1878 		case 'W':
1879 			proc_id = PROC_REPO_WRITE;
1880 			break;
1881 		default:
1882 			usage();
1883 		}
1884 	}
1885 
1886 	argc -= optind;
1887 	argv += optind;
1888 
1889 	if (argc != 0)
1890 		usage();
1891 
1892 	if (geteuid() && (proc_id == PROC_GOTD || proc_id == PROC_LISTEN))
1893 		fatalx("need root privileges");
1894 
1895 	if (parse_config(confpath, proc_id, &gotd) != 0)
1896 		return 1;
1897 
1898 	pw = getpwnam(gotd.user_name);
1899 	if (pw == NULL)
1900 		fatalx("user %s not found", gotd.user_name);
1901 
1902 	if (pw->pw_uid == 0)
1903 		fatalx("cannot run %s as the superuser", getprogname());
1904 
1905 	if (noaction) {
1906 		fprintf(stderr, "configuration OK\n");
1907 		return 0;
1908 	}
1909 
1910 	gotd.argv0 = argv0;
1911 	gotd.daemonize = daemonize;
1912 	gotd.verbosity = verbosity;
1913 	gotd.confpath = confpath;
1914 
1915 	/* Require an absolute path in argv[0] for reliable re-exec. */
1916 	if (!got_path_is_absolute(argv0))
1917 		fatalx("bad path \"%s\": must be an absolute path", argv0);
1918 
1919 	log_init(daemonize ? 0 : 1, LOG_DAEMON);
1920 	log_setverbose(verbosity);
1921 
1922 	if (proc_id == PROC_GOTD) {
1923 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
1924 		arc4random_buf(&clients_hash_key, sizeof(clients_hash_key));
1925 		if (daemonize && daemon(1, 0) == -1)
1926 			fatal("daemon");
1927 		gotd.pid = getpid();
1928 		start_listener(argv0, confpath, daemonize, verbosity);
1929 	} else if (proc_id == PROC_LISTEN) {
1930 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
1931 		if (verbosity) {
1932 			log_info("socket: %s", gotd.unix_socket_path);
1933 			log_info("user: %s", pw->pw_name);
1934 		}
1935 
1936 		fd = unix_socket_listen(gotd.unix_socket_path, pw->pw_uid,
1937 		    pw->pw_gid);
1938 		if (fd == -1) {
1939 			fatal("cannot listen on unix socket %s",
1940 			    gotd.unix_socket_path);
1941 		}
1942 	} else if (proc_id == PROC_AUTH) {
1943 		snprintf(title, sizeof(title), "%s %s",
1944 		    gotd_proc_names[proc_id], repo_path);
1945 	} else if (proc_id == PROC_REPO_READ || proc_id == PROC_REPO_WRITE ||
1946 	    proc_id == PROC_SESSION_READ || proc_id == PROC_SESSION_WRITE) {
1947 		error = got_repo_pack_fds_open(&pack_fds);
1948 		if (error != NULL)
1949 			fatalx("cannot open pack tempfiles: %s", error->msg);
1950 		error = got_repo_temp_fds_open(&temp_fds);
1951 		if (error != NULL)
1952 			fatalx("cannot open pack tempfiles: %s", error->msg);
1953 		if (repo_path == NULL)
1954 			fatalx("repository path not specified");
1955 		snprintf(title, sizeof(title), "%s %s",
1956 		    gotd_proc_names[proc_id], repo_path);
1957 	} else
1958 		fatal("invalid process id %d", proc_id);
1959 
1960 	setproctitle("%s", title);
1961 	log_procinit(title);
1962 
1963 	/* Drop root privileges. */
1964 	if (setgid(pw->pw_gid) == -1)
1965 		fatal("setgid %d failed", pw->pw_gid);
1966 	if (setuid(pw->pw_uid) == -1)
1967 		fatal("setuid %d failed", pw->pw_uid);
1968 
1969 	event_init();
1970 
1971 	switch (proc_id) {
1972 	case PROC_GOTD:
1973 #ifndef PROFILE
1974 		/* "exec" promise will be limited to argv[0] via unveil(2). */
1975 		if (pledge("stdio proc exec sendfd recvfd unveil", NULL) == -1)
1976 			err(1, "pledge");
1977 #endif
1978 		break;
1979 	case PROC_LISTEN:
1980 #ifndef PROFILE
1981 		if (pledge("stdio sendfd unix unveil", NULL) == -1)
1982 			err(1, "pledge");
1983 #endif
1984 		/*
1985 		 * Ensure that AF_UNIX bind(2) cannot be used with any other
1986 		 * sockets by revoking all filesystem access via unveil(2).
1987 		 */
1988 		apply_unveil_none();
1989 
1990 		listen_main(title, fd, gotd.connection_limits,
1991 		    gotd.nconnection_limits);
1992 		/* NOTREACHED */
1993 		break;
1994 	case PROC_AUTH:
1995 #ifndef PROFILE
1996 		if (pledge("stdio getpw recvfd unix unveil", NULL) == -1)
1997 			err(1, "pledge");
1998 #endif
1999 		/*
2000 		 * We need the "unix" pledge promise for getpeername(2) only.
2001 		 * Ensure that AF_UNIX bind(2) cannot be used by revoking all
2002 		 * filesystem access via unveil(2). Access to password database
2003 		 * files will still work since "getpw" bypasses unveil(2).
2004 		 */
2005 		apply_unveil_none();
2006 
2007 		auth_main(title, &gotd.repos, repo_path);
2008 		/* NOTREACHED */
2009 		break;
2010 	case PROC_SESSION_READ:
2011 	case PROC_SESSION_WRITE:
2012 #ifndef PROFILE
2013 		/*
2014 		 * The "recvfd" promise is only needed during setup and
2015 		 * will be removed in a later pledge(2) call.
2016 		 */
2017 		if (pledge("stdio rpath wpath cpath recvfd sendfd fattr flock "
2018 		    "unveil", NULL) == -1)
2019 			err(1, "pledge");
2020 #endif
2021 		if (proc_id == PROC_SESSION_READ)
2022 			apply_unveil_repo_readonly(repo_path, 1);
2023 		else
2024 			apply_unveil_repo_readwrite(repo_path);
2025 		session_main(title, repo_path, pack_fds, temp_fds,
2026 		    &gotd.request_timeout, proc_id);
2027 		/* NOTREACHED */
2028 		break;
2029 	case PROC_REPO_READ:
2030 		set_max_datasize();
2031 #ifndef PROFILE
2032 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
2033 			err(1, "pledge");
2034 #endif
2035 		apply_unveil_repo_readonly(repo_path, 0);
2036 		repo_read_main(title, repo_path, pack_fds, temp_fds);
2037 		/* NOTREACHED */
2038 		exit(0);
2039 	case PROC_REPO_WRITE:
2040 		set_max_datasize();
2041 #ifndef PROFILE
2042 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
2043 			err(1, "pledge");
2044 #endif
2045 		apply_unveil_repo_readonly(repo_path, 0);
2046 		repo = gotd_find_repo_by_path(repo_path, &gotd);
2047 		if (repo == NULL)
2048 			fatalx("no repository for path %s", repo_path);
2049 		repo_write_main(title, repo_path, pack_fds, temp_fds,
2050 		    &repo->protected_tag_namespaces,
2051 		    &repo->protected_branch_namespaces,
2052 		    &repo->protected_branches);
2053 		/* NOTREACHED */
2054 		exit(0);
2055 	default:
2056 		fatal("invalid process id %d", proc_id);
2057 	}
2058 
2059 	if (proc_id != PROC_GOTD)
2060 		fatal("invalid process id %d", proc_id);
2061 
2062 	evtimer_set(&gotd.listen_proc->tmo, kill_proc_timeout,
2063 	    gotd.listen_proc);
2064 
2065 	apply_unveil_selfexec();
2066 
2067 	signal_set(&evsigint, SIGINT, gotd_sighdlr, NULL);
2068 	signal_set(&evsigterm, SIGTERM, gotd_sighdlr, NULL);
2069 	signal_set(&evsighup, SIGHUP, gotd_sighdlr, NULL);
2070 	signal_set(&evsigusr1, SIGUSR1, gotd_sighdlr, NULL);
2071 	signal_set(&evsigchld, SIGCHLD, gotd_sighdlr, NULL);
2072 	signal(SIGPIPE, SIG_IGN);
2073 
2074 	signal_add(&evsigint, NULL);
2075 	signal_add(&evsigterm, NULL);
2076 	signal_add(&evsighup, NULL);
2077 	signal_add(&evsigusr1, NULL);
2078 	signal_add(&evsigchld, NULL);
2079 
2080 	gotd_imsg_event_add(&gotd.listen_proc->iev);
2081 
2082 	event_dispatch();
2083 
2084 	free(repo_path);
2085 	gotd_shutdown();
2086 
2087 	return 0;
2088 }