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Date:: Mon Jan 2 11:43:39 2023 UTC
Message:: fmt
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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 
26 #include <fcntl.h>
27 #include <err.h>
28 #include <errno.h>
29 #include <event.h>
30 #include <limits.h>
31 #include <pwd.h>
32 #include <grp.h>
33 #include <imsg.h>
34 #include <sha1.h>
35 #include <signal.h>
36 #include <siphash.h>
37 #include <stdarg.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <syslog.h>
42 #include <unistd.h>
43 
44 #include "got_error.h"
45 #include "got_opentemp.h"
46 #include "got_path.h"
47 #include "got_repository.h"
48 #include "got_object.h"
49 #include "got_reference.h"
50 
51 #include "got_lib_delta.h"
52 #include "got_lib_object.h"
53 #include "got_lib_object_cache.h"
54 #include "got_lib_sha1.h"
55 #include "got_lib_gitproto.h"
56 #include "got_lib_pack.h"
57 #include "got_lib_repository.h"
58 
59 #include "gotd.h"
60 #include "log.h"
61 #include "listen.h"
62 #include "auth.h"
63 #include "repo_read.h"
64 #include "repo_write.h"
65 
66 #ifndef nitems
67 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
68 #endif
69 
70 struct gotd_client {
71 	STAILQ_ENTRY(gotd_client)	 entry;
72 	enum gotd_client_state		 state;
73 	struct gotd_client_capability	*capabilities;
74 	size_t				 ncapa_alloc;
75 	size_t				 ncapabilities;
76 	uint32_t			 id;
77 	int				 fd;
78 	int				 delta_cache_fd;
79 	struct gotd_imsgev		 iev;
80 	struct event			 tmo;
81 	uid_t				 euid;
82 	gid_t				 egid;
83 	struct gotd_child_proc		*repo_read;
84 	struct gotd_child_proc		*repo_write;
85 	struct gotd_child_proc		*auth;
86 	int				 required_auth;
87 	char				*packfile_path;
88 	char				*packidx_path;
89 	int				 nref_updates;
90 };
91 STAILQ_HEAD(gotd_clients, gotd_client);
92 
93 static struct gotd_clients gotd_clients[GOTD_CLIENT_TABLE_SIZE];
94 static SIPHASH_KEY clients_hash_key;
95 volatile int client_cnt;
96 static struct timeval timeout = { 3600, 0 };
97 static struct timeval auth_timeout = { 5, 0 };
98 static struct gotd gotd;
99 
100 void gotd_sighdlr(int sig, short event, void *arg);
101 static void gotd_shutdown(void);
102 static const struct got_error *start_repo_child(struct gotd_client *,
103     enum gotd_procid, struct gotd_repo *, char *, const char *, int, int);
104 static const struct got_error *start_auth_child(struct gotd_client *, int,
105     struct gotd_repo *, char *, const char *, int, int);
106 static void kill_proc(struct gotd_child_proc *, int);
107 
108 __dead static void
109 usage()
110 {
111 	fprintf(stderr, "usage: %s [-dv] [-f config-file]\n", getprogname());
112 	exit(1);
113 }
114 
115 static int
116 unix_socket_listen(const char *unix_socket_path, uid_t uid, gid_t gid)
117 {
118 	struct sockaddr_un sun;
119 	int fd = -1;
120 	mode_t old_umask, mode;
121 
122 	fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK| SOCK_CLOEXEC, 0);
123 	if (fd == -1) {
124 		log_warn("socket");
125 		return -1;
126 	}
127 
128 	sun.sun_family = AF_UNIX;
129 	if (strlcpy(sun.sun_path, unix_socket_path,
130 	    sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
131 		log_warnx("%s: name too long", unix_socket_path);
132 		close(fd);
133 		return -1;
134 	}
135 
136 	if (unlink(unix_socket_path) == -1) {
137 		if (errno != ENOENT) {
138 			log_warn("unlink %s", unix_socket_path);
139 			close(fd);
140 			return -1;
141 		}
142 	}
143 
144 	old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
145 	mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP;
146 
147 	if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
148 		log_warn("bind: %s", unix_socket_path);
149 		close(fd);
150 		umask(old_umask);
151 		return -1;
152 	}
153 
154 	umask(old_umask);
155 
156 	if (chmod(unix_socket_path, mode) == -1) {
157 		log_warn("chmod %o %s", mode, unix_socket_path);
158 		close(fd);
159 		unlink(unix_socket_path);
160 		return -1;
161 	}
162 
163 	if (chown(unix_socket_path, uid, gid) == -1) {
164 		log_warn("chown %s uid=%d gid=%d", unix_socket_path, uid, gid);
165 		close(fd);
166 		unlink(unix_socket_path);
167 		return -1;
168 	}
169 
170 	if (listen(fd, GOTD_UNIX_SOCKET_BACKLOG) == -1) {
171 		log_warn("listen");
172 		close(fd);
173 		unlink(unix_socket_path);
174 		return -1;
175 	}
176 
177 	return fd;
178 }
179 
180 static struct group *
181 match_group(gid_t *groups, int ngroups, const char *unix_group_name)
182 {
183 	struct group *gr;
184 	int i;
185 
186 	for (i = 0; i < ngroups; i++) {
187 		gr = getgrgid(groups[i]);
188 		if (gr == NULL) {
189 			log_warn("getgrgid %d", groups[i]);
190 			continue;
191 		}
192 		if (strcmp(gr->gr_name, unix_group_name) == 0)
193 			return gr;
194 	}
195 
196 	return NULL;
197 }
198 
199 static uint64_t
200 client_hash(uint32_t client_id)
201 {
202 	return SipHash24(&clients_hash_key, &client_id, sizeof(client_id));
203 }
204 
205 static void
206 add_client(struct gotd_client *client)
207 {
208 	uint64_t slot = client_hash(client->id) % nitems(gotd_clients);
209 	STAILQ_INSERT_HEAD(&gotd_clients[slot], client, entry);
210 	client_cnt++;
211 }
212 
213 static struct gotd_client *
214 find_client(uint32_t client_id)
215 {
216 	uint64_t slot;
217 	struct gotd_client *c;
218 
219 	slot = client_hash(client_id) % nitems(gotd_clients);
220 	STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
221 		if (c->id == client_id)
222 			return c;
223 	}
224 
225 	return NULL;
226 }
227 
228 static struct gotd_child_proc *
229 get_client_proc(struct gotd_client *client)
230 {
231 	if (client->repo_read && client->repo_write) {
232 		fatalx("uid %d is reading and writing in the same session",
233 		    client->euid);
234 		/* NOTREACHED */
235 	}
236 
237 	if (client->repo_read)
238 		return client->repo_read;
239 	else if (client->repo_write)
240 		return client->repo_write;
241 
242 	return NULL;
243 }
244 
245 static struct gotd_client *
246 find_client_by_proc_fd(int fd)
247 {
248 	uint64_t slot;
249 
250 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
251 		struct gotd_client *c;
252 
253 		STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
254 			struct gotd_child_proc *proc = get_client_proc(c);
255 			if (proc && proc->iev.ibuf.fd == fd)
256 				return c;
257 			if (c->auth && c->auth->iev.ibuf.fd == fd)
258 				return c;
259 		}
260 	}
261 
262 	return NULL;
263 }
264 
265 static int
266 client_is_reading(struct gotd_client *client)
267 {
268 	return client->repo_read != NULL;
269 }
270 
271 static int
272 client_is_writing(struct gotd_client *client)
273 {
274 	return client->repo_write != NULL;
275 }
276 
277 static const struct got_error *
278 ensure_client_is_reading(struct gotd_client *client)
279 {
280 	if (!client_is_reading(client)) {
281 		return got_error_fmt(GOT_ERR_BAD_PACKET,
282 		    "uid %d made a read-request but is not reading from "
283 		    "a repository", client->euid);
284 	}
285 
286 	return NULL;
287 }
288 
289 static const struct got_error *
290 ensure_client_is_writing(struct gotd_client *client)
291 {
292 	if (!client_is_writing(client)) {
293 		return got_error_fmt(GOT_ERR_BAD_PACKET,
294 		    "uid %d made a write-request but is not writing to "
295 		    "a repository", client->euid);
296 	}
297 
298 	return NULL;
299 }
300 
301 static const struct got_error *
302 ensure_client_is_not_writing(struct gotd_client *client)
303 {
304 	if (client_is_writing(client)) {
305 		return got_error_fmt(GOT_ERR_BAD_PACKET,
306 		    "uid %d made a read-request but is writing to "
307 		    "a repository", client->euid);
308 	}
309 
310 	return NULL;
311 }
312 
313 static const struct got_error *
314 ensure_client_is_not_reading(struct gotd_client *client)
315 {
316 	if (client_is_reading(client)) {
317 		return got_error_fmt(GOT_ERR_BAD_PACKET,
318 		    "uid %d made a write-request but is reading from "
319 		    "a repository", client->euid);
320 	}
321 
322 	return NULL;
323 }
324 
325 static void
326 wait_for_child(pid_t child_pid)
327 {
328 	pid_t pid;
329 	int status;
330 
331 	log_debug("waiting for child PID %ld to terminate",
332 	    (long)child_pid);
333 
334 	do {
335 		pid = waitpid(child_pid, &status, WNOHANG);
336 		if (pid == -1) {
337 			if (errno != EINTR && errno != ECHILD)
338 				fatal("wait");
339 		} else if (WIFSIGNALED(status)) {
340 			log_warnx("child PID %ld terminated; signal %d",
341 			    (long)pid, WTERMSIG(status));
342 		}
343 	} while (pid != -1 || (pid == -1 && errno == EINTR));
344 }
345 
346 static void
347 kill_auth_proc(struct gotd_client *client)
348 {
349 	struct gotd_child_proc *proc;
350 
351 	if (client->auth == NULL)
352 		return;
353 
354 	proc = client->auth;
355 	client->auth = NULL;
356 
357 	event_del(&proc->iev.ev);
358 	msgbuf_clear(&proc->iev.ibuf.w);
359 	close(proc->iev.ibuf.fd);
360 	kill_proc(proc, 0);
361 	wait_for_child(proc->pid);
362 	free(proc);
363 }
364 
365 static void
366 disconnect(struct gotd_client *client)
367 {
368 	struct gotd_imsg_disconnect idisconnect;
369 	struct gotd_child_proc *proc = get_client_proc(client);
370 	struct gotd_child_proc *listen_proc = &gotd.listen_proc;
371 	uint64_t slot;
372 
373 	log_debug("uid %d: disconnecting", client->euid);
374 
375 	kill_auth_proc(client);
376 
377 	idisconnect.client_id = client->id;
378 	if (proc) {
379 		if (gotd_imsg_compose_event(&proc->iev,
380 		    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
381 		    &idisconnect, sizeof(idisconnect)) == -1)
382 			log_warn("imsg compose DISCONNECT");
383 
384 		msgbuf_clear(&proc->iev.ibuf.w);
385 		close(proc->iev.ibuf.fd);
386 		kill_proc(proc, 0);
387 		wait_for_child(proc->pid);
388 		free(proc);
389 		proc = NULL;
390 	}
391 
392 	if (gotd_imsg_compose_event(&listen_proc->iev,
393 	    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
394 	    &idisconnect, sizeof(idisconnect)) == -1)
395 		log_warn("imsg compose DISCONNECT");
396 
397 	slot = client_hash(client->id) % nitems(gotd_clients);
398 	STAILQ_REMOVE(&gotd_clients[slot], client, gotd_client, entry);
399 	imsg_clear(&client->iev.ibuf);
400 	event_del(&client->iev.ev);
401 	evtimer_del(&client->tmo);
402 	close(client->fd);
403 	if (client->delta_cache_fd != -1)
404 		close(client->delta_cache_fd);
405 	if (client->packfile_path) {
406 		if (unlink(client->packfile_path) == -1 && errno != ENOENT)
407 			log_warn("unlink %s: ", client->packfile_path);
408 		free(client->packfile_path);
409 	}
410 	if (client->packidx_path) {
411 		if (unlink(client->packidx_path) == -1 && errno != ENOENT)
412 			log_warn("unlink %s: ", client->packidx_path);
413 		free(client->packidx_path);
414 	}
415 	free(client->capabilities);
416 	free(client);
417 	client_cnt--;
418 }
419 
420 static void
421 disconnect_on_error(struct gotd_client *client, const struct got_error *err)
422 {
423 	struct imsgbuf ibuf;
424 
425 	log_warnx("uid %d: %s", client->euid, err->msg);
426 	if (err->code != GOT_ERR_EOF) {
427 		imsg_init(&ibuf, client->fd);
428 		gotd_imsg_send_error(&ibuf, 0, PROC_GOTD, err);
429 		imsg_clear(&ibuf);
430 	}
431 	disconnect(client);
432 }
433 
434 static const struct got_error *
435 send_repo_info(struct gotd_imsgev *iev, struct gotd_repo *repo)
436 {
437 	const struct got_error *err = NULL;
438 	struct gotd_imsg_info_repo irepo;
439 
440 	memset(&irepo, 0, sizeof(irepo));
441 
442 	if (strlcpy(irepo.repo_name, repo->name, sizeof(irepo.repo_name))
443 	    >= sizeof(irepo.repo_name))
444 		return got_error_msg(GOT_ERR_NO_SPACE, "repo name too long");
445 	if (strlcpy(irepo.repo_path, repo->path, sizeof(irepo.repo_path))
446 	    >= sizeof(irepo.repo_path))
447 		return got_error_msg(GOT_ERR_NO_SPACE, "repo path too long");
448 
449 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_REPO, PROC_GOTD, -1,
450 	    &irepo, sizeof(irepo)) == -1) {
451 		err = got_error_from_errno("imsg compose INFO_REPO");
452 		if (err)
453 			return err;
454 	}
455 
456 	return NULL;
457 }
458 
459 static const struct got_error *
460 send_capability(struct gotd_client_capability *capa, struct gotd_imsgev* iev)
461 {
462 	const struct got_error *err = NULL;
463 	struct gotd_imsg_capability icapa;
464 	size_t len;
465 	struct ibuf *wbuf;
466 
467 	memset(&icapa, 0, sizeof(icapa));
468 
469 	icapa.key_len = strlen(capa->key);
470 	len = sizeof(icapa) + icapa.key_len;
471 	if (capa->value) {
472 		icapa.value_len = strlen(capa->value);
473 		len += icapa.value_len;
474 	}
475 
476 	wbuf = imsg_create(&iev->ibuf, GOTD_IMSG_CAPABILITY, 0, 0, len);
477 	if (wbuf == NULL) {
478 		err = got_error_from_errno("imsg_create CAPABILITY");
479 		return err;
480 	}
481 
482 	if (imsg_add(wbuf, &icapa, sizeof(icapa)) == -1)
483 		return got_error_from_errno("imsg_add CAPABILITY");
484 	if (imsg_add(wbuf, capa->key, icapa.key_len) == -1)
485 		return got_error_from_errno("imsg_add CAPABILITY");
486 	if (capa->value) {
487 		if (imsg_add(wbuf, capa->value, icapa.value_len) == -1)
488 			return got_error_from_errno("imsg_add CAPABILITY");
489 	}
490 
491 	wbuf->fd = -1;
492 	imsg_close(&iev->ibuf, wbuf);
493 
494 	gotd_imsg_event_add(iev);
495 
496 	return NULL;
497 }
498 
499 static const struct got_error *
500 send_client_info(struct gotd_imsgev *iev, struct gotd_client *client)
501 {
502 	const struct got_error *err = NULL;
503 	struct gotd_imsg_info_client iclient;
504 	struct gotd_child_proc *proc;
505 	size_t i;
506 
507 	memset(&iclient, 0, sizeof(iclient));
508 	iclient.euid = client->euid;
509 	iclient.egid = client->egid;
510 
511 	proc = get_client_proc(client);
512 	if (proc) {
513 		if (strlcpy(iclient.repo_name, proc->repo_path,
514 		    sizeof(iclient.repo_name)) >= sizeof(iclient.repo_name)) {
515 			return got_error_msg(GOT_ERR_NO_SPACE,
516 			    "repo name too long");
517 		}
518 		if (client_is_writing(client))
519 			iclient.is_writing = 1;
520 	}
521 
522 	iclient.state = client->state;
523 	iclient.ncapabilities = client->ncapabilities;
524 
525 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_CLIENT, PROC_GOTD, -1,
526 	    &iclient, sizeof(iclient)) == -1) {
527 		err = got_error_from_errno("imsg compose INFO_CLIENT");
528 		if (err)
529 			return err;
530 	}
531 
532 	for (i = 0; i < client->ncapabilities; i++) {
533 		struct gotd_client_capability *capa;
534 		capa = &client->capabilities[i];
535 		err = send_capability(capa, iev);
536 		if (err)
537 			return err;
538 	}
539 
540 	return NULL;
541 }
542 
543 static const struct got_error *
544 send_info(struct gotd_client *client)
545 {
546 	const struct got_error *err = NULL;
547 	struct gotd_imsg_info info;
548 	uint64_t slot;
549 	struct gotd_repo *repo;
550 
551 	info.pid = gotd.pid;
552 	info.verbosity = gotd.verbosity;
553 	info.nrepos = gotd.nrepos;
554 	info.nclients = client_cnt - 1;
555 
556 	if (gotd_imsg_compose_event(&client->iev, GOTD_IMSG_INFO, PROC_GOTD, -1,
557 	    &info, sizeof(info)) == -1) {
558 		err = got_error_from_errno("imsg compose INFO");
559 		if (err)
560 			return err;
561 	}
562 
563 	TAILQ_FOREACH(repo, &gotd.repos, entry) {
564 		err = send_repo_info(&client->iev, repo);
565 		if (err)
566 			return err;
567 	}
568 
569 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
570 		struct gotd_client *c;
571 		STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
572 			if (c->id == client->id)
573 				continue;
574 			err = send_client_info(&client->iev, c);
575 			if (err)
576 				return err;
577 		}
578 	}
579 
580 	return NULL;
581 }
582 
583 static const struct got_error *
584 stop_gotd(struct gotd_client *client)
585 {
586 
587 	if (client->euid != 0)
588 		return got_error_set_errno(EPERM, "stop");
589 
590 	gotd_shutdown();
591 	/* NOTREACHED */
592 	return NULL;
593 }
594 
595 static struct gotd_repo *
596 find_repo_by_name(const char *repo_name)
597 {
598 	struct gotd_repo *repo;
599 	size_t namelen;
600 
601 	TAILQ_FOREACH(repo, &gotd.repos, entry) {
602 		namelen = strlen(repo->name);
603 		if (strncmp(repo->name, repo_name, namelen) != 0)
604 			continue;
605 		if (repo_name[namelen] == '\0' ||
606 		    strcmp(&repo_name[namelen], ".git") == 0)
607 			return repo;
608 	}
609 
610 	return NULL;
611 }
612 
613 static const struct got_error *
614 start_client_session(struct gotd_client *client, struct imsg *imsg)
615 {
616 	const struct got_error *err;
617 	struct gotd_imsg_list_refs ireq;
618 	struct gotd_repo *repo = NULL;
619 	size_t datalen;
620 
621 	log_debug("list-refs request from uid %d", client->euid);
622 
623 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
624 	if (datalen != sizeof(ireq))
625 		return got_error(GOT_ERR_PRIVSEP_LEN);
626 
627 	memcpy(&ireq, imsg->data, datalen);
628 
629 	if (ireq.client_is_reading) {
630 		err = ensure_client_is_not_writing(client);
631 		if (err)
632 			return err;
633 		repo = find_repo_by_name(ireq.repo_name);
634 		if (repo == NULL)
635 			return got_error(GOT_ERR_NOT_GIT_REPO);
636 		err = start_auth_child(client, GOTD_AUTH_READ, repo,
637 		    gotd.argv0, gotd.confpath, gotd.daemonize,
638 		    gotd.verbosity);
639 		if (err)
640 			return err;
641 	} else {
642 		err = ensure_client_is_not_reading(client);
643 		if (err)
644 			return err;
645 		repo = find_repo_by_name(ireq.repo_name);
646 		if (repo == NULL)
647 			return got_error(GOT_ERR_NOT_GIT_REPO);
648 		err = start_auth_child(client,
649 		    GOTD_AUTH_READ | GOTD_AUTH_WRITE,
650 		    repo, gotd.argv0, gotd.confpath, gotd.daemonize,
651 		    gotd.verbosity);
652 		if (err)
653 			return err;
654 	}
655 
656 	/* Flow continues upon authentication successs/failure or timeout. */
657 	return NULL;
658 }
659 
660 static const struct got_error *
661 forward_want(struct gotd_client *client, struct imsg *imsg)
662 {
663 	struct gotd_imsg_want ireq;
664 	struct gotd_imsg_want iwant;
665 	size_t datalen;
666 
667 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
668 	if (datalen != sizeof(ireq))
669 		return got_error(GOT_ERR_PRIVSEP_LEN);
670 
671 	memcpy(&ireq, imsg->data, datalen);
672 
673 	memset(&iwant, 0, sizeof(iwant));
674 	memcpy(iwant.object_id, ireq.object_id, SHA1_DIGEST_LENGTH);
675 	iwant.client_id = client->id;
676 
677 	if (gotd_imsg_compose_event(&client->repo_read->iev, GOTD_IMSG_WANT,
678 	    PROC_GOTD, -1, &iwant, sizeof(iwant)) == -1)
679 		return got_error_from_errno("imsg compose WANT");
680 
681 	return NULL;
682 }
683 
684 static const struct got_error *
685 forward_ref_update(struct gotd_client *client, struct imsg *imsg)
686 {
687 	const struct got_error *err = NULL;
688 	struct gotd_imsg_ref_update ireq;
689 	struct gotd_imsg_ref_update *iref = NULL;
690 	size_t datalen;
691 
692 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
693 	if (datalen < sizeof(ireq))
694 		return got_error(GOT_ERR_PRIVSEP_LEN);
695 	memcpy(&ireq, imsg->data, sizeof(ireq));
696 	if (datalen != sizeof(ireq) + ireq.name_len)
697 		return got_error(GOT_ERR_PRIVSEP_LEN);
698 
699 	iref = malloc(datalen);
700 	if (iref == NULL)
701 		return got_error_from_errno("malloc");
702 	memcpy(iref, imsg->data, datalen);
703 
704 	iref->client_id = client->id;
705 	if (gotd_imsg_compose_event(&client->repo_write->iev,
706 	    GOTD_IMSG_REF_UPDATE, PROC_GOTD, -1, iref, datalen) == -1)
707 		err = got_error_from_errno("imsg compose REF_UPDATE");
708 	free(iref);
709 	return err;
710 }
711 
712 static const struct got_error *
713 forward_have(struct gotd_client *client, struct imsg *imsg)
714 {
715 	struct gotd_imsg_have ireq;
716 	struct gotd_imsg_have ihave;
717 	size_t datalen;
718 
719 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
720 	if (datalen != sizeof(ireq))
721 		return got_error(GOT_ERR_PRIVSEP_LEN);
722 
723 	memcpy(&ireq, imsg->data, datalen);
724 
725 	memset(&ihave, 0, sizeof(ihave));
726 	memcpy(ihave.object_id, ireq.object_id, SHA1_DIGEST_LENGTH);
727 	ihave.client_id = client->id;
728 
729 	if (gotd_imsg_compose_event(&client->repo_read->iev, GOTD_IMSG_HAVE,
730 	    PROC_GOTD, -1, &ihave, sizeof(ihave)) == -1)
731 		return got_error_from_errno("imsg compose HAVE");
732 
733 	return NULL;
734 }
735 
736 static int
737 client_has_capability(struct gotd_client *client, const char *capastr)
738 {
739 	struct gotd_client_capability *capa;
740 	size_t i;
741 
742 	if (client->ncapabilities == 0)
743 		return 0;
744 
745 	for (i = 0; i < client->ncapabilities; i++) {
746 		capa = &client->capabilities[i];
747 		if (strcmp(capa->key, capastr) == 0)
748 			return 1;
749 	}
750 
751 	return 0;
752 }
753 
754 static const struct got_error *
755 recv_capabilities(struct gotd_client *client, struct imsg *imsg)
756 {
757 	struct gotd_imsg_capabilities icapas;
758 	size_t datalen;
759 
760 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
761 	if (datalen != sizeof(icapas))
762 		return got_error(GOT_ERR_PRIVSEP_LEN);
763 	memcpy(&icapas, imsg->data, sizeof(icapas));
764 
765 	client->ncapa_alloc = icapas.ncapabilities;
766 	client->capabilities = calloc(client->ncapa_alloc,
767 	    sizeof(*client->capabilities));
768 	if (client->capabilities == NULL) {
769 		client->ncapa_alloc = 0;
770 		return got_error_from_errno("calloc");
771 	}
772 
773 	log_debug("expecting %zu capabilities from uid %d",
774 	    client->ncapa_alloc, client->euid);
775 	return NULL;
776 }
777 
778 static const struct got_error *
779 recv_capability(struct gotd_client *client, struct imsg *imsg)
780 {
781 	struct gotd_imsg_capability icapa;
782 	struct gotd_client_capability *capa;
783 	size_t datalen;
784 	char *key, *value = NULL;
785 
786 	if (client->capabilities == NULL ||
787 	    client->ncapabilities >= client->ncapa_alloc) {
788 		return got_error_msg(GOT_ERR_BAD_REQUEST,
789 		    "unexpected capability received");
790 	}
791 
792 	memset(&icapa, 0, sizeof(icapa));
793 
794 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
795 	if (datalen < sizeof(icapa))
796 		return got_error(GOT_ERR_PRIVSEP_LEN);
797 	memcpy(&icapa, imsg->data, sizeof(icapa));
798 
799 	if (datalen != sizeof(icapa) + icapa.key_len + icapa.value_len)
800 		return got_error(GOT_ERR_PRIVSEP_LEN);
801 
802 	key = malloc(icapa.key_len + 1);
803 	if (key == NULL)
804 		return got_error_from_errno("malloc");
805 	if (icapa.value_len > 0) {
806 		value = malloc(icapa.value_len + 1);
807 		if (value == NULL) {
808 			free(key);
809 			return got_error_from_errno("malloc");
810 		}
811 	}
812 
813 	memcpy(key, imsg->data + sizeof(icapa), icapa.key_len);
814 	key[icapa.key_len] = '\0';
815 	if (value) {
816 		memcpy(value, imsg->data + sizeof(icapa) + icapa.key_len,
817 		    icapa.value_len);
818 		value[icapa.value_len] = '\0';
819 	}
820 
821 	capa = &client->capabilities[client->ncapabilities++];
822 	capa->key = key;
823 	capa->value = value;
824 
825 	if (value)
826 		log_debug("uid %d: capability %s=%s", client->euid, key, value);
827 	else
828 		log_debug("uid %d: capability %s", client->euid, key);
829 
830 	return NULL;
831 }
832 
833 static const struct got_error *
834 send_packfile(struct gotd_client *client)
835 {
836 	const struct got_error *err = NULL;
837 	struct gotd_imsg_send_packfile ipack;
838 	struct gotd_imsg_packfile_pipe ipipe;
839 	int pipe[2];
840 
841 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe) == -1)
842 		return got_error_from_errno("socketpair");
843 
844 	memset(&ipack, 0, sizeof(ipack));
845 	memset(&ipipe, 0, sizeof(ipipe));
846 
847 	ipack.client_id = client->id;
848 	if (client_has_capability(client, GOT_CAPA_SIDE_BAND_64K))
849 		ipack.report_progress = 1;
850 
851 	client->delta_cache_fd = got_opentempfd();
852 	if (client->delta_cache_fd == -1)
853 		return got_error_from_errno("got_opentempfd");
854 
855 	if (gotd_imsg_compose_event(&client->repo_read->iev,
856 	    GOTD_IMSG_SEND_PACKFILE, PROC_GOTD, client->delta_cache_fd,
857 	    &ipack, sizeof(ipack)) == -1) {
858 		err = got_error_from_errno("imsg compose SEND_PACKFILE");
859 		close(pipe[0]);
860 		close(pipe[1]);
861 		return err;
862 	}
863 
864 	ipipe.client_id = client->id;
865 
866 	/* Send pack pipe end 0 to repo_read. */
867 	if (gotd_imsg_compose_event(&client->repo_read->iev,
868 	    GOTD_IMSG_PACKFILE_PIPE, PROC_GOTD, pipe[0],
869 	        &ipipe, sizeof(ipipe)) == -1) {
870 		err = got_error_from_errno("imsg compose PACKFILE_PIPE");
871 		close(pipe[1]);
872 		return err;
873 	}
874 
875 	/* Send pack pipe end 1 to gotsh(1) (expects just an fd, no data). */
876 	if (gotd_imsg_compose_event(&client->iev,
877 	    GOTD_IMSG_PACKFILE_PIPE, PROC_GOTD, pipe[1], NULL, 0) == -1)
878 		err = got_error_from_errno("imsg compose PACKFILE_PIPE");
879 
880 	return err;
881 }
882 
883 static const struct got_error *
884 recv_packfile(struct gotd_client *client)
885 {
886 	const struct got_error *err = NULL;
887 	struct gotd_imsg_recv_packfile ipack;
888 	struct gotd_imsg_packfile_pipe ipipe;
889 	struct gotd_imsg_packidx_file ifile;
890 	char *basepath = NULL, *pack_path = NULL, *idx_path = NULL;
891 	int packfd = -1, idxfd = -1;
892 	int pipe[2] = { -1, -1 };
893 
894 	if (client->packfile_path) {
895 		return got_error_fmt(GOT_ERR_PRIVSEP_MSG,
896 		    "uid %d already has a pack file", client->euid);
897 	}
898 
899 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe) == -1)
900 		return got_error_from_errno("socketpair");
901 
902 	memset(&ipipe, 0, sizeof(ipipe));
903 	ipipe.client_id = client->id;
904 
905 	if (gotd_imsg_compose_event(&client->repo_write->iev,
906 	    GOTD_IMSG_PACKFILE_PIPE, PROC_GOTD, pipe[0],
907 	        &ipipe, sizeof(ipipe)) == -1) {
908 		err = got_error_from_errno("imsg compose PACKFILE_PIPE");
909 		pipe[0] = -1;
910 		goto done;
911 	}
912 	pipe[0] = -1;
913 
914 	if (gotd_imsg_compose_event(&client->repo_write->iev,
915 	    GOTD_IMSG_PACKFILE_PIPE, PROC_GOTD, pipe[1],
916 	        &ipipe, sizeof(ipipe)) == -1)
917 		err = got_error_from_errno("imsg compose PACKFILE_PIPE");
918 	pipe[1] = -1;
919 
920 	if (asprintf(&basepath, "%s/%s/receiving-from-uid-%d.pack",
921 	    client->repo_write->repo_path, GOT_OBJECTS_PACK_DIR,
922 	    client->euid) == -1) {
923 		err = got_error_from_errno("asprintf");
924 		goto done;
925 	}
926 
927 	err = got_opentemp_named_fd(&pack_path, &packfd, basepath, "");
928 	if (err)
929 		goto done;
930 
931 	free(basepath);
932 	if (asprintf(&basepath, "%s/%s/receiving-from-uid-%d.idx",
933 	    client->repo_write->repo_path, GOT_OBJECTS_PACK_DIR,
934 	    client->euid) == -1) {
935 		err = got_error_from_errno("asprintf");
936 		basepath = NULL;
937 		goto done;
938 	}
939 	err = got_opentemp_named_fd(&idx_path, &idxfd, basepath, "");
940 	if (err)
941 		goto done;
942 
943 	memset(&ifile, 0, sizeof(ifile));
944 	ifile.client_id = client->id;
945 	if (gotd_imsg_compose_event(&client->repo_write->iev,
946 	    GOTD_IMSG_PACKIDX_FILE, PROC_GOTD, idxfd,
947 	    &ifile, sizeof(ifile)) == -1) {
948 		err = got_error_from_errno("imsg compose PACKIDX_FILE");
949 		idxfd = -1;
950 		goto done;
951 	}
952 	idxfd = -1;
953 
954 	memset(&ipack, 0, sizeof(ipack));
955 	ipack.client_id = client->id;
956 	if (client_has_capability(client, GOT_CAPA_REPORT_STATUS))
957 		ipack.report_status = 1;
958 
959 	if (gotd_imsg_compose_event(&client->repo_write->iev,
960 	    GOTD_IMSG_RECV_PACKFILE, PROC_GOTD, packfd,
961 	    &ipack, sizeof(ipack)) == -1) {
962 		err = got_error_from_errno("imsg compose RECV_PACKFILE");
963 		packfd = -1;
964 		goto done;
965 	}
966 	packfd = -1;
967 
968 done:
969 	free(basepath);
970 	if (pipe[0] != -1 && close(pipe[0]) == -1 && err == NULL)
971 		err = got_error_from_errno("close");
972 	if (pipe[1] != -1 && close(pipe[1]) == -1 && err == NULL)
973 		err = got_error_from_errno("close");
974 	if (packfd != -1 && close(packfd) == -1 && err == NULL)
975 		err = got_error_from_errno("close");
976 	if (idxfd != -1 && close(idxfd) == -1 && err == NULL)
977 		err = got_error_from_errno("close");
978 	if (err) {
979 		free(pack_path);
980 		free(idx_path);
981 	} else {
982 		client->packfile_path = pack_path;
983 		client->packidx_path = idx_path;
984 	}
985 	return err;
986 }
987 
988 static void
989 gotd_request(int fd, short events, void *arg)
990 {
991 	struct gotd_imsgev *iev = arg;
992 	struct imsgbuf *ibuf = &iev->ibuf;
993 	struct gotd_client *client = iev->handler_arg;
994 	const struct got_error *err = NULL;
995 	struct imsg imsg;
996 	ssize_t n;
997 
998 	if (events & EV_WRITE) {
999 		while (ibuf->w.queued) {
1000 			n = msgbuf_write(&ibuf->w);
1001 			if (n == -1 && errno == EPIPE) {
1002 				/*
1003 				 * The client has closed its socket.
1004 				 * This can happen when Git clients are
1005 				 * done sending pack file data.
1006 				 */
1007 				msgbuf_clear(&ibuf->w);
1008 				continue;
1009 			} else if (n == -1 && errno != EAGAIN) {
1010 				err = got_error_from_errno("imsg_flush");
1011 				disconnect_on_error(client, err);
1012 				return;
1013 			}
1014 			if (n == 0) {
1015 				/* Connection closed. */
1016 				err = got_error(GOT_ERR_EOF);
1017 				disconnect_on_error(client, err);
1018 				return;
1019 			}
1020 		}
1021 
1022 		/* Disconnect gotctl(8) now that messages have been sent. */
1023 		if (!client_is_reading(client) && !client_is_writing(client)) {
1024 			disconnect(client);
1025 			return;
1026 		}
1027 	}
1028 
1029 	if ((events & EV_READ) == 0)
1030 		return;
1031 
1032 	memset(&imsg, 0, sizeof(imsg));
1033 
1034 	while (err == NULL) {
1035 		err = gotd_imsg_recv(&imsg, ibuf, 0);
1036 		if (err) {
1037 			if (err->code == GOT_ERR_PRIVSEP_READ)
1038 				err = NULL;
1039 			break;
1040 		}
1041 
1042 		evtimer_del(&client->tmo);
1043 
1044 		switch (imsg.hdr.type) {
1045 		case GOTD_IMSG_INFO:
1046 			err = send_info(client);
1047 			break;
1048 		case GOTD_IMSG_STOP:
1049 			err = stop_gotd(client);
1050 			break;
1051 		case GOTD_IMSG_LIST_REFS:
1052 			if (client->state != GOTD_STATE_EXPECT_LIST_REFS) {
1053 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1054 				    "unexpected list-refs request received");
1055 				break;
1056 			}
1057 			err = start_client_session(client, &imsg);
1058 			if (err)
1059 				break;
1060 			break;
1061 		case GOTD_IMSG_CAPABILITIES:
1062 			if (client->state != GOTD_STATE_EXPECT_CAPABILITIES) {
1063 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1064 				    "unexpected capabilities received");
1065 				break;
1066 			}
1067 			log_debug("receiving capabilities from uid %d",
1068 			    client->euid);
1069 			err = recv_capabilities(client, &imsg);
1070 			break;
1071 		case GOTD_IMSG_CAPABILITY:
1072 			if (client->state != GOTD_STATE_EXPECT_CAPABILITIES) {
1073 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1074 				    "unexpected capability received");
1075 				break;
1076 			}
1077 			err = recv_capability(client, &imsg);
1078 			if (err || client->ncapabilities < client->ncapa_alloc)
1079 				break;
1080 			if (client_is_reading(client)) {
1081 				client->state = GOTD_STATE_EXPECT_WANT;
1082 				log_debug("uid %d: expecting want-lines",
1083 				    client->euid);
1084 			} else if (client_is_writing(client)) {
1085 				client->state = GOTD_STATE_EXPECT_REF_UPDATE;
1086 				log_debug("uid %d: expecting ref-update-lines",
1087 				    client->euid);
1088 			} else
1089 				fatalx("client %d is both reading and writing",
1090 				    client->euid);
1091 			break;
1092 		case GOTD_IMSG_WANT:
1093 			if (client->state != GOTD_STATE_EXPECT_WANT) {
1094 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1095 				    "unexpected want-line received");
1096 				break;
1097 			}
1098 			log_debug("received want-line from uid %d",
1099 			    client->euid);
1100 			err = ensure_client_is_reading(client);
1101 			if (err)
1102 				break;
1103 			err = forward_want(client, &imsg);
1104 			break;
1105 		case GOTD_IMSG_REF_UPDATE:
1106 			if (client->state != GOTD_STATE_EXPECT_REF_UPDATE) {
1107 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1108 				    "unexpected ref-update-line received");
1109 				break;
1110 			}
1111 			log_debug("received ref-update-line from uid %d",
1112 			    client->euid);
1113 			err = ensure_client_is_writing(client);
1114 			if (err)
1115 				break;
1116 			err = forward_ref_update(client, &imsg);
1117 			if (err)
1118 				break;
1119 			client->state = GOTD_STATE_EXPECT_MORE_REF_UPDATES;
1120 			break;
1121 		case GOTD_IMSG_HAVE:
1122 			if (client->state != GOTD_STATE_EXPECT_HAVE) {
1123 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1124 				    "unexpected have-line received");
1125 				break;
1126 			}
1127 			log_debug("received have-line from uid %d",
1128 			    client->euid);
1129 			err = ensure_client_is_reading(client);
1130 			if (err)
1131 				break;
1132 			err = forward_have(client, &imsg);
1133 			if (err)
1134 				break;
1135 			break;
1136 		case GOTD_IMSG_FLUSH:
1137 			if (client->state == GOTD_STATE_EXPECT_WANT ||
1138 			    client->state == GOTD_STATE_EXPECT_HAVE) {
1139 				err = ensure_client_is_reading(client);
1140 				if (err)
1141 					break;
1142 			} else if (client->state ==
1143 			    GOTD_STATE_EXPECT_MORE_REF_UPDATES) {
1144 				err = ensure_client_is_writing(client);
1145 				if (err)
1146 					break;
1147 			} else {
1148 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1149 				    "unexpected flush-pkt received");
1150 				break;
1151 			}
1152 			log_debug("received flush-pkt from uid %d",
1153 			    client->euid);
1154 			if (client->state == GOTD_STATE_EXPECT_WANT) {
1155 				client->state = GOTD_STATE_EXPECT_HAVE;
1156 				log_debug("uid %d: expecting have-lines",
1157 				    client->euid);
1158 			} else if (client->state == GOTD_STATE_EXPECT_HAVE) {
1159 				client->state = GOTD_STATE_EXPECT_DONE;
1160 				log_debug("uid %d: expecting 'done'",
1161 				    client->euid);
1162 			} else if (client->state ==
1163 			    GOTD_STATE_EXPECT_MORE_REF_UPDATES) {
1164 				client->state = GOTD_STATE_EXPECT_PACKFILE;
1165 				log_debug("uid %d: expecting packfile",
1166 				    client->euid);
1167 				err = recv_packfile(client);
1168 			} else {
1169 				/* should not happen, see above */
1170 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1171 				    "unexpected client state");
1172 				break;
1173 			}
1174 			break;
1175 		case GOTD_IMSG_DONE:
1176 			if (client->state != GOTD_STATE_EXPECT_HAVE &&
1177 			    client->state != GOTD_STATE_EXPECT_DONE) {
1178 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1179 				    "unexpected flush-pkt received");
1180 				break;
1181 			}
1182 			log_debug("received 'done' from uid %d", client->euid);
1183 			err = ensure_client_is_reading(client);
1184 			if (err)
1185 				break;
1186 			client->state = GOTD_STATE_DONE;
1187 			err = send_packfile(client);
1188 			break;
1189 		default:
1190 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1191 			break;
1192 		}
1193 
1194 		imsg_free(&imsg);
1195 	}
1196 
1197 	if (err) {
1198 		if (err->code != GOT_ERR_EOF ||
1199 		    client->state != GOTD_STATE_EXPECT_PACKFILE)
1200 			disconnect_on_error(client, err);
1201 	} else {
1202 		gotd_imsg_event_add(&client->iev);
1203 		if (client->state == GOTD_STATE_EXPECT_LIST_REFS)
1204 			evtimer_add(&client->tmo, &auth_timeout);
1205 		else
1206 			evtimer_add(&client->tmo, &timeout);
1207 	}
1208 }
1209 
1210 static void
1211 gotd_request_timeout(int fd, short events, void *arg)
1212 {
1213 	struct gotd_client *client = arg;
1214 
1215 	log_debug("disconnecting uid %d due to timeout", client->euid);
1216 	disconnect(client);
1217 }
1218 
1219 static const struct got_error *
1220 recv_connect(uint32_t *client_id, struct imsg *imsg)
1221 {
1222 	const struct got_error *err = NULL;
1223 	struct gotd_imsg_connect iconnect;
1224 	size_t datalen;
1225 	int s = -1;
1226 	struct gotd_client *client = NULL;
1227 
1228 	*client_id = 0;
1229 
1230 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1231 	if (datalen != sizeof(iconnect))
1232 		return got_error(GOT_ERR_PRIVSEP_LEN);
1233 	memcpy(&iconnect, imsg->data, sizeof(iconnect));
1234 
1235 	s = imsg->fd;
1236 	if (s == -1) {
1237 		err = got_error(GOT_ERR_PRIVSEP_NO_FD);
1238 		goto done;
1239 	}
1240 
1241 	if (find_client(iconnect.client_id)) {
1242 		err = got_error_msg(GOT_ERR_CLIENT_ID, "duplicate client ID");
1243 		goto done;
1244 	}
1245 
1246 	client = calloc(1, sizeof(*client));
1247 	if (client == NULL) {
1248 		err = got_error_from_errno("calloc");
1249 		goto done;
1250 	}
1251 
1252 	*client_id = iconnect.client_id;
1253 
1254 	client->state = GOTD_STATE_EXPECT_LIST_REFS;
1255 	client->id = iconnect.client_id;
1256 	client->fd = s;
1257 	s = -1;
1258 	client->delta_cache_fd = -1;
1259 	/* The auth process will verify UID/GID for us. */
1260 	client->euid = iconnect.euid;
1261 	client->egid = iconnect.egid;
1262 	client->nref_updates = -1;
1263 
1264 	imsg_init(&client->iev.ibuf, client->fd);
1265 	client->iev.handler = gotd_request;
1266 	client->iev.events = EV_READ;
1267 	client->iev.handler_arg = client;
1268 
1269 	event_set(&client->iev.ev, client->fd, EV_READ, gotd_request,
1270 	    &client->iev);
1271 	gotd_imsg_event_add(&client->iev);
1272 
1273 	evtimer_set(&client->tmo, gotd_request_timeout, client);
1274 
1275 	add_client(client);
1276 	log_debug("%s: new client uid %d connected on fd %d", __func__,
1277 	    client->euid, client->fd);
1278 done:
1279 	if (err) {
1280 		struct gotd_child_proc *listen_proc = &gotd.listen_proc;
1281 		struct gotd_imsg_disconnect idisconnect;
1282 
1283 		idisconnect.client_id = client->id;
1284 		if (gotd_imsg_compose_event(&listen_proc->iev,
1285 		    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
1286 		    &idisconnect, sizeof(idisconnect)) == -1)
1287 			log_warn("imsg compose DISCONNECT");
1288 
1289 		if (s != -1)
1290 			close(s);
1291 	}
1292 
1293 	return err;
1294 }
1295 
1296 static const char *gotd_proc_names[PROC_MAX] = {
1297 	"parent",
1298 	"listen",
1299 	"auth",
1300 	"repo_read",
1301 	"repo_write"
1302 };
1303 
1304 static void
1305 kill_proc(struct gotd_child_proc *proc, int fatal)
1306 {
1307 	if (fatal) {
1308 		log_warnx("sending SIGKILL to PID %d", proc->pid);
1309 		kill(proc->pid, SIGKILL);
1310 	} else
1311 		kill(proc->pid, SIGTERM);
1312 }
1313 
1314 static void
1315 gotd_shutdown(void)
1316 {
1317 	struct gotd_child_proc *proc;
1318 	uint64_t slot;
1319 
1320 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
1321 		struct gotd_client *c, *tmp;
1322 
1323 		STAILQ_FOREACH_SAFE(c, &gotd_clients[slot], entry, tmp)
1324 			disconnect(c);
1325 	}
1326 
1327 	proc = &gotd.listen_proc;
1328 	msgbuf_clear(&proc->iev.ibuf.w);
1329 	close(proc->iev.ibuf.fd);
1330 	kill_proc(proc, 0);
1331 	wait_for_child(proc->pid);
1332 
1333 	log_info("terminating");
1334 	exit(0);
1335 }
1336 
1337 void
1338 gotd_sighdlr(int sig, short event, void *arg)
1339 {
1340 	/*
1341 	 * Normal signal handler rules don't apply because libevent
1342 	 * decouples for us.
1343 	 */
1344 
1345 	switch (sig) {
1346 	case SIGHUP:
1347 		log_info("%s: ignoring SIGHUP", __func__);
1348 		break;
1349 	case SIGUSR1:
1350 		log_info("%s: ignoring SIGUSR1", __func__);
1351 		break;
1352 	case SIGTERM:
1353 	case SIGINT:
1354 		gotd_shutdown();
1355 		log_warnx("gotd terminating");
1356 		exit(0);
1357 		break;
1358 	default:
1359 		fatalx("unexpected signal");
1360 	}
1361 }
1362 
1363 static const struct got_error *
1364 ensure_proc_is_reading(struct gotd_client *client,
1365     struct gotd_child_proc *proc)
1366 {
1367 	if (!client_is_reading(client)) {
1368 		kill_proc(proc, 1);
1369 		return got_error_fmt(GOT_ERR_BAD_PACKET,
1370 		    "PID %d handled a read-request for uid %d but this "
1371 		    "user is not reading from a repository", proc->pid,
1372 		    client->euid);
1373 	}
1374 
1375 	return NULL;
1376 }
1377 
1378 static const struct got_error *
1379 ensure_proc_is_writing(struct gotd_client *client,
1380     struct gotd_child_proc *proc)
1381 {
1382 	if (!client_is_writing(client)) {
1383 		kill_proc(proc, 1);
1384 		return got_error_fmt(GOT_ERR_BAD_PACKET,
1385 		    "PID %d handled a write-request for uid %d but this "
1386 		    "user is not writing to a repository", proc->pid,
1387 		    client->euid);
1388 	}
1389 
1390 	return NULL;
1391 }
1392 
1393 static int
1394 verify_imsg_src(struct gotd_client *client, struct gotd_child_proc *proc,
1395     struct imsg *imsg)
1396 {
1397 	const struct got_error *err;
1398 	struct gotd_child_proc *client_proc;
1399 	int ret = 0;
1400 
1401 	if (proc->type == PROC_REPO_READ || proc->type == PROC_REPO_WRITE) {
1402 		client_proc = get_client_proc(client);
1403 		if (client_proc == NULL)
1404 			fatalx("no process found for uid %d", client->euid);
1405 		if (proc->pid != client_proc->pid) {
1406 			kill_proc(proc, 1);
1407 			log_warnx("received message from PID %d for uid %d, "
1408 			    "while PID %d is the process serving this user",
1409 			    proc->pid, client->euid, client_proc->pid);
1410 			return 0;
1411 		}
1412 	}
1413 
1414 	switch (imsg->hdr.type) {
1415 	case GOTD_IMSG_ERROR:
1416 		ret = 1;
1417 		break;
1418 	case GOTD_IMSG_CONNECT:
1419 		if (proc->type != PROC_LISTEN) {
1420 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
1421 			    "new connection for uid %d from PID %d "
1422 			    "which is not the listen process",
1423 			    proc->pid, client->euid);
1424 		} else
1425 			ret = 1;
1426 		break;
1427 	case GOTD_IMSG_ACCESS_GRANTED:
1428 		if (proc->type != PROC_AUTH) {
1429 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
1430 			    "authentication of uid %d from PID %d "
1431 			    "which is not the auth process",
1432 			    proc->pid, client->euid);
1433 		} else
1434 			ret = 1;
1435 		break;
1436 	case GOTD_IMSG_REPO_CHILD_READY:
1437 		if (proc->type != PROC_REPO_READ &&
1438 		    proc->type != PROC_REPO_WRITE) {
1439 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
1440 			    "unexpected \"ready\" signal from PID %d",
1441 			    proc->pid);
1442 		} else
1443 			ret = 1;
1444 		break;
1445 	case GOTD_IMSG_PACKFILE_DONE:
1446 		err = ensure_proc_is_reading(client, proc);
1447 		if (err)
1448 			log_warnx("uid %d: %s", client->euid, err->msg);
1449 		else
1450 			ret = 1;
1451 		break;
1452 	case GOTD_IMSG_PACKFILE_INSTALL:
1453 	case GOTD_IMSG_REF_UPDATES_START:
1454 	case GOTD_IMSG_REF_UPDATE:
1455 		err = ensure_proc_is_writing(client, proc);
1456 		if (err)
1457 			log_warnx("uid %d: %s", client->euid, err->msg);
1458 		else
1459 			ret = 1;
1460 		break;
1461 	default:
1462 		log_debug("%s: unexpected imsg %d", __func__, imsg->hdr.type);
1463 		break;
1464 	}
1465 
1466 	return ret;
1467 }
1468 
1469 static const struct got_error *
1470 list_refs_request(struct gotd_client *client, struct gotd_imsgev *iev)
1471 {
1472 	static const struct got_error *err;
1473 	struct gotd_imsg_list_refs_internal ilref;
1474 	int fd;
1475 
1476 	memset(&ilref, 0, sizeof(ilref));
1477 	ilref.client_id = client->id;
1478 
1479 	fd = dup(client->fd);
1480 	if (fd == -1)
1481 		return got_error_from_errno("dup");
1482 
1483 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_LIST_REFS_INTERNAL,
1484 	    PROC_GOTD, fd, &ilref, sizeof(ilref)) == -1) {
1485 		err = got_error_from_errno("imsg compose WANT");
1486 		close(fd);
1487 		return err;
1488 	}
1489 
1490 	client->state = GOTD_STATE_EXPECT_CAPABILITIES;
1491 	log_debug("uid %d: expecting capabilities", client->euid);
1492 	return NULL;
1493 }
1494 
1495 static const struct got_error *
1496 recv_packfile_done(uint32_t *client_id, struct imsg *imsg)
1497 {
1498 	struct gotd_imsg_packfile_done idone;
1499 	size_t datalen;
1500 
1501 	log_debug("packfile-done received");
1502 
1503 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1504 	if (datalen != sizeof(idone))
1505 		return got_error(GOT_ERR_PRIVSEP_LEN);
1506 	memcpy(&idone, imsg->data, sizeof(idone));
1507 
1508 	*client_id = idone.client_id;
1509 	return NULL;
1510 }
1511 
1512 static const struct got_error *
1513 recv_packfile_install(uint32_t *client_id, struct imsg *imsg)
1514 {
1515 	struct gotd_imsg_packfile_install inst;
1516 	size_t datalen;
1517 
1518 	log_debug("packfile-install received");
1519 
1520 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1521 	if (datalen != sizeof(inst))
1522 		return got_error(GOT_ERR_PRIVSEP_LEN);
1523 	memcpy(&inst, imsg->data, sizeof(inst));
1524 
1525 	*client_id = inst.client_id;
1526 	return NULL;
1527 }
1528 
1529 static const struct got_error *
1530 recv_ref_updates_start(uint32_t *client_id, struct imsg *imsg)
1531 {
1532 	struct gotd_imsg_ref_updates_start istart;
1533 	size_t datalen;
1534 
1535 	log_debug("ref-updates-start received");
1536 
1537 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1538 	if (datalen != sizeof(istart))
1539 		return got_error(GOT_ERR_PRIVSEP_LEN);
1540 	memcpy(&istart, imsg->data, sizeof(istart));
1541 
1542 	*client_id = istart.client_id;
1543 	return NULL;
1544 }
1545 
1546 static const struct got_error *
1547 recv_ref_update(uint32_t *client_id, struct imsg *imsg)
1548 {
1549 	struct gotd_imsg_ref_update iref;
1550 	size_t datalen;
1551 
1552 	log_debug("ref-update received");
1553 
1554 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1555 	if (datalen < sizeof(iref))
1556 		return got_error(GOT_ERR_PRIVSEP_LEN);
1557 	memcpy(&iref, imsg->data, sizeof(iref));
1558 
1559 	*client_id = iref.client_id;
1560 	return NULL;
1561 }
1562 
1563 static const struct got_error *
1564 send_ref_update_ok(struct gotd_client *client,
1565     struct gotd_imsg_ref_update *iref, const char *refname)
1566 {
1567 	struct gotd_imsg_ref_update_ok iok;
1568 	struct ibuf *wbuf;
1569 	size_t len;
1570 
1571 	memset(&iok, 0, sizeof(iok));
1572 	iok.client_id = client->id;
1573 	memcpy(iok.old_id, iref->old_id, SHA1_DIGEST_LENGTH);
1574 	memcpy(iok.new_id, iref->new_id, SHA1_DIGEST_LENGTH);
1575 	iok.name_len = strlen(refname);
1576 
1577 	len = sizeof(iok) + iok.name_len;
1578 	wbuf = imsg_create(&client->iev.ibuf, GOTD_IMSG_REF_UPDATE_OK,
1579 	    PROC_GOTD, gotd.pid, len);
1580 	if (wbuf == NULL)
1581 		return got_error_from_errno("imsg_create REF_UPDATE_OK");
1582 
1583 	if (imsg_add(wbuf, &iok, sizeof(iok)) == -1)
1584 		return got_error_from_errno("imsg_add REF_UPDATE_OK");
1585 	if (imsg_add(wbuf, refname, iok.name_len) == -1)
1586 		return got_error_from_errno("imsg_add REF_UPDATE_OK");
1587 
1588 	wbuf->fd = -1;
1589 	imsg_close(&client->iev.ibuf, wbuf);
1590 	gotd_imsg_event_add(&client->iev);
1591 	return NULL;
1592 }
1593 
1594 static void
1595 send_refs_updated(struct gotd_client *client)
1596 {
1597 	if (gotd_imsg_compose_event(&client->iev,
1598 	    GOTD_IMSG_REFS_UPDATED, PROC_GOTD, -1, NULL, 0) == -1)
1599 		log_warn("imsg compose REFS_UPDATED");
1600 }
1601 
1602 static const struct got_error *
1603 send_ref_update_ng(struct gotd_client *client,
1604     struct gotd_imsg_ref_update *iref, const char *refname,
1605     const char *reason)
1606 {
1607 	const struct got_error *ng_err;
1608 	struct gotd_imsg_ref_update_ng ing;
1609 	struct ibuf *wbuf;
1610 	size_t len;
1611 
1612 	memset(&ing, 0, sizeof(ing));
1613 	ing.client_id = client->id;
1614 	memcpy(ing.old_id, iref->old_id, SHA1_DIGEST_LENGTH);
1615 	memcpy(ing.new_id, iref->new_id, SHA1_DIGEST_LENGTH);
1616 	ing.name_len = strlen(refname);
1617 
1618 	ng_err = got_error_fmt(GOT_ERR_REF_BUSY, "%s", reason);
1619 	ing.reason_len = strlen(ng_err->msg);
1620 
1621 	len = sizeof(ing) + ing.name_len + ing.reason_len;
1622 	wbuf = imsg_create(&client->iev.ibuf, GOTD_IMSG_REF_UPDATE_NG,
1623 	    PROC_GOTD, gotd.pid, len);
1624 	if (wbuf == NULL)
1625 		return got_error_from_errno("imsg_create REF_UPDATE_NG");
1626 
1627 	if (imsg_add(wbuf, &ing, sizeof(ing)) == -1)
1628 		return got_error_from_errno("imsg_add REF_UPDATE_NG");
1629 	if (imsg_add(wbuf, refname, ing.name_len) == -1)
1630 		return got_error_from_errno("imsg_add REF_UPDATE_NG");
1631 	if (imsg_add(wbuf, ng_err->msg, ing.reason_len) == -1)
1632 		return got_error_from_errno("imsg_add REF_UPDATE_NG");
1633 
1634 	wbuf->fd = -1;
1635 	imsg_close(&client->iev.ibuf, wbuf);
1636 	gotd_imsg_event_add(&client->iev);
1637 	return NULL;
1638 }
1639 
1640 static const struct got_error *
1641 install_pack(struct gotd_client *client, const char *repo_path,
1642     struct imsg *imsg)
1643 {
1644 	const struct got_error *err = NULL;
1645 	struct gotd_imsg_packfile_install inst;
1646 	char hex[SHA1_DIGEST_STRING_LENGTH];
1647 	size_t datalen;
1648 	char *packfile_path = NULL, *packidx_path = NULL;
1649 
1650 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1651 	if (datalen != sizeof(inst))
1652 		return got_error(GOT_ERR_PRIVSEP_LEN);
1653 	memcpy(&inst, imsg->data, sizeof(inst));
1654 
1655 	if (client->packfile_path == NULL)
1656 		return got_error_msg(GOT_ERR_BAD_REQUEST,
1657 		    "client has no pack file");
1658 	if (client->packidx_path == NULL)
1659 		return got_error_msg(GOT_ERR_BAD_REQUEST,
1660 		    "client has no pack file index");
1661 
1662 	if (got_sha1_digest_to_str(inst.pack_sha1, hex, sizeof(hex)) == NULL)
1663 		return got_error_msg(GOT_ERR_NO_SPACE,
1664 		    "could not convert pack file SHA1 to hex");
1665 
1666 	if (asprintf(&packfile_path, "/%s/%s/pack-%s.pack",
1667 	    repo_path, GOT_OBJECTS_PACK_DIR, hex) == -1) {
1668 		err = got_error_from_errno("asprintf");
1669 		goto done;
1670 	}
1671 
1672 	if (asprintf(&packidx_path, "/%s/%s/pack-%s.idx",
1673 	    repo_path, GOT_OBJECTS_PACK_DIR, hex) == -1) {
1674 		err = got_error_from_errno("asprintf");
1675 		goto done;
1676 	}
1677 
1678 	if (rename(client->packfile_path, packfile_path) == -1) {
1679 		err = got_error_from_errno3("rename", client->packfile_path,
1680 		    packfile_path);
1681 		goto done;
1682 	}
1683 
1684 	free(client->packfile_path);
1685 	client->packfile_path = NULL;
1686 
1687 	if (rename(client->packidx_path, packidx_path) == -1) {
1688 		err = got_error_from_errno3("rename", client->packidx_path,
1689 		    packidx_path);
1690 		goto done;
1691 	}
1692 
1693 	free(client->packidx_path);
1694 	client->packidx_path = NULL;
1695 done:
1696 	free(packfile_path);
1697 	free(packidx_path);
1698 	return err;
1699 }
1700 
1701 static const struct got_error *
1702 begin_ref_updates(struct gotd_client *client, struct imsg *imsg)
1703 {
1704 	struct gotd_imsg_ref_updates_start istart;
1705 	size_t datalen;
1706 
1707 	if (client->nref_updates != -1)
1708 		return got_error(GOT_ERR_PRIVSEP_MSG);
1709 
1710 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1711 	if (datalen != sizeof(istart))
1712 		return got_error(GOT_ERR_PRIVSEP_LEN);
1713 	memcpy(&istart, imsg->data, sizeof(istart));
1714 
1715 	if (istart.nref_updates <= 0)
1716 		return got_error(GOT_ERR_PRIVSEP_MSG);
1717 
1718 	client->nref_updates = istart.nref_updates;
1719 	return NULL;
1720 }
1721 
1722 static const struct got_error *
1723 update_ref(struct gotd_client *client, const char *repo_path,
1724     struct imsg *imsg)
1725 {
1726 	const struct got_error *err = NULL;
1727 	struct got_repository *repo = NULL;
1728 	struct got_reference *ref = NULL;
1729 	struct gotd_imsg_ref_update iref;
1730 	struct got_object_id old_id, new_id;
1731 	struct got_object_id *id = NULL;
1732 	struct got_object *obj = NULL;
1733 	char *refname = NULL;
1734 	size_t datalen;
1735 	int locked = 0;
1736 
1737 	log_debug("update-ref from uid %d", client->euid);
1738 
1739 	if (client->nref_updates <= 0)
1740 		return got_error(GOT_ERR_PRIVSEP_MSG);
1741 
1742 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1743 	if (datalen < sizeof(iref))
1744 		return got_error(GOT_ERR_PRIVSEP_LEN);
1745 	memcpy(&iref, imsg->data, sizeof(iref));
1746 	if (datalen != sizeof(iref) + iref.name_len)
1747 		return got_error(GOT_ERR_PRIVSEP_LEN);
1748 	refname = malloc(iref.name_len + 1);
1749 	if (refname == NULL)
1750 		return got_error_from_errno("malloc");
1751 	memcpy(refname, imsg->data + sizeof(iref), iref.name_len);
1752 	refname[iref.name_len] = '\0';
1753 
1754 	log_debug("updating ref %s for uid %d", refname, client->euid);
1755 
1756 	err = got_repo_open(&repo, repo_path, NULL, NULL);
1757 	if (err)
1758 		goto done;
1759 
1760 	memcpy(old_id.sha1, iref.old_id, SHA1_DIGEST_LENGTH);
1761 	memcpy(new_id.sha1, iref.new_id, SHA1_DIGEST_LENGTH);
1762 	err = got_object_open(&obj, repo, &new_id);
1763 	if (err)
1764 		goto done;
1765 
1766 	if (iref.ref_is_new) {
1767 		err = got_ref_open(&ref, repo, refname, 0);
1768 		if (err) {
1769 			if (err->code != GOT_ERR_NOT_REF)
1770 				goto done;
1771 			err = got_ref_alloc(&ref, refname, &new_id);
1772 			if (err)
1773 				goto done;
1774 			err = got_ref_write(ref, repo); /* will lock/unlock */
1775 			if (err)
1776 				goto done;
1777 		} else {
1778 			err = got_error_fmt(GOT_ERR_REF_BUSY,
1779 			    "%s has been created by someone else "
1780 			    "while transaction was in progress",
1781 			    got_ref_get_name(ref));
1782 			goto done;
1783 		}
1784 	} else {
1785 		err = got_ref_open(&ref, repo, refname, 1 /* lock */);
1786 		if (err)
1787 			goto done;
1788 		locked = 1;
1789 
1790 		err = got_ref_resolve(&id, repo, ref);
1791 		if (err)
1792 			goto done;
1793 
1794 		if (got_object_id_cmp(id, &old_id) != 0) {
1795 			err = got_error_fmt(GOT_ERR_REF_BUSY,
1796 			    "%s has been modified by someone else "
1797 			    "while transaction was in progress",
1798 			    got_ref_get_name(ref));
1799 			goto done;
1800 		}
1801 
1802 		err = got_ref_change_ref(ref, &new_id);
1803 		if (err)
1804 			goto done;
1805 
1806 		err = got_ref_write(ref, repo);
1807 		if (err)
1808 			goto done;
1809 
1810 		free(id);
1811 		id = NULL;
1812 	}
1813 done:
1814 	if (err) {
1815 		if (err->code == GOT_ERR_LOCKFILE_TIMEOUT) {
1816 			err = got_error_fmt(GOT_ERR_LOCKFILE_TIMEOUT,
1817 			    "could not acquire exclusive file lock for %s",
1818 			    refname);
1819 		}
1820 		send_ref_update_ng(client, &iref, refname, err->msg);
1821 	} else
1822 		send_ref_update_ok(client, &iref, refname);
1823 
1824 	if (client->nref_updates > 0) {
1825 		client->nref_updates--;
1826 		if (client->nref_updates == 0)
1827 			send_refs_updated(client);
1828 
1829 	}
1830 	if (locked) {
1831 		const struct got_error *unlock_err;
1832 		unlock_err = got_ref_unlock(ref);
1833 		if (unlock_err && err == NULL)
1834 			err = unlock_err;
1835 	}
1836 	if (ref)
1837 		got_ref_close(ref);
1838 	if (obj)
1839 		got_object_close(obj);
1840 	if (repo)
1841 		got_repo_close(repo);
1842 	free(refname);
1843 	free(id);
1844 	return err;
1845 }
1846 
1847 static void
1848 gotd_dispatch_listener(int fd, short event, void *arg)
1849 {
1850 	struct gotd_imsgev *iev = arg;
1851 	struct imsgbuf *ibuf = &iev->ibuf;
1852 	struct gotd_child_proc *proc = &gotd.listen_proc;
1853 	ssize_t n;
1854 	int shut = 0;
1855 	struct imsg imsg;
1856 
1857 	if (proc->iev.ibuf.fd != fd)
1858 		fatalx("%s: unexpected fd %d", __func__, fd);
1859 
1860 	if (event & EV_READ) {
1861 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1862 			fatal("imsg_read error");
1863 		if (n == 0) {
1864 			/* Connection closed. */
1865 			shut = 1;
1866 			goto done;
1867 		}
1868 	}
1869 
1870 	if (event & EV_WRITE) {
1871 		n = msgbuf_write(&ibuf->w);
1872 		if (n == -1 && errno != EAGAIN)
1873 			fatal("msgbuf_write");
1874 		if (n == 0) {
1875 			/* Connection closed. */
1876 			shut = 1;
1877 			goto done;
1878 		}
1879 	}
1880 
1881 	for (;;) {
1882 		const struct got_error *err = NULL;
1883 		struct gotd_client *client = NULL;
1884 		uint32_t client_id = 0;
1885 		int do_disconnect = 0;
1886 
1887 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1888 			fatal("%s: imsg_get error", __func__);
1889 		if (n == 0)	/* No more messages. */
1890 			break;
1891 
1892 		switch (imsg.hdr.type) {
1893 		case GOTD_IMSG_ERROR:
1894 			do_disconnect = 1;
1895 			err = gotd_imsg_recv_error(&client_id, &imsg);
1896 			break;
1897 		case GOTD_IMSG_CONNECT:
1898 			err = recv_connect(&client_id, &imsg);
1899 			break;
1900 		default:
1901 			log_debug("unexpected imsg %d", imsg.hdr.type);
1902 			break;
1903 		}
1904 
1905 		client = find_client(client_id);
1906 		if (client == NULL) {
1907 			log_warnx("%s: client not found", __func__);
1908 			imsg_free(&imsg);
1909 			continue;
1910 		}
1911 
1912 		if (err)
1913 			log_warnx("uid %d: %s", client->euid, err->msg);
1914 
1915 		if (do_disconnect) {
1916 			if (err)
1917 				disconnect_on_error(client, err);
1918 			else
1919 				disconnect(client);
1920 		}
1921 
1922 		imsg_free(&imsg);
1923 	}
1924 done:
1925 	if (!shut) {
1926 		gotd_imsg_event_add(iev);
1927 	} else {
1928 		/* This pipe is dead. Remove its event handler */
1929 		event_del(&iev->ev);
1930 		event_loopexit(NULL);
1931 	}
1932 }
1933 
1934 static void
1935 gotd_dispatch_auth_child(int fd, short event, void *arg)
1936 {
1937 	const struct got_error *err = NULL;
1938 	struct gotd_imsgev *iev = arg;
1939 	struct imsgbuf *ibuf = &iev->ibuf;
1940 	struct gotd_client *client;
1941 	struct gotd_repo *repo = NULL;
1942 	ssize_t n;
1943 	int shut = 0;
1944 	struct imsg imsg;
1945 	uint32_t client_id = 0;
1946 	int do_disconnect = 0;
1947 	enum gotd_procid proc_type;
1948 
1949 	client = find_client_by_proc_fd(fd);
1950 	if (client == NULL)
1951 		fatalx("cannot find client for fd %d", fd);
1952 
1953 	if (client->auth == NULL)
1954 		fatalx("cannot find auth child process for fd %d", fd);
1955 
1956 	if (event & EV_READ) {
1957 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1958 			fatal("imsg_read error");
1959 		if (n == 0) {
1960 			/* Connection closed. */
1961 			shut = 1;
1962 			goto done;
1963 		}
1964 	}
1965 
1966 	if (event & EV_WRITE) {
1967 		n = msgbuf_write(&ibuf->w);
1968 		if (n == -1 && errno != EAGAIN)
1969 			fatal("msgbuf_write");
1970 		if (n == 0) {
1971 			/* Connection closed. */
1972 			shut = 1;
1973 		}
1974 		goto done;
1975 	}
1976 
1977 	if (client->auth->iev.ibuf.fd != fd)
1978 		fatalx("%s: unexpected fd %d", __func__, fd);
1979 
1980 	if ((n = imsg_get(ibuf, &imsg)) == -1)
1981 		fatal("%s: imsg_get error", __func__);
1982 	if (n == 0)	/* No more messages. */
1983 		return;
1984 
1985 	evtimer_del(&client->tmo);
1986 
1987 	switch (imsg.hdr.type) {
1988 	case GOTD_IMSG_ERROR:
1989 		do_disconnect = 1;
1990 		err = gotd_imsg_recv_error(&client_id, &imsg);
1991 		break;
1992 	case GOTD_IMSG_ACCESS_GRANTED:
1993 		break;
1994 	default:
1995 		do_disconnect = 1;
1996 		log_debug("unexpected imsg %d", imsg.hdr.type);
1997 		break;
1998 	}
1999 
2000 	if (!verify_imsg_src(client, client->auth, &imsg)) {
2001 		do_disconnect = 1;
2002 		log_debug("dropping imsg type %d from PID %d",
2003 		    imsg.hdr.type, client->auth->pid);
2004 	}
2005 	imsg_free(&imsg);
2006 
2007 	if (do_disconnect) {
2008 		if (err)
2009 			disconnect_on_error(client, err);
2010 		else
2011 			disconnect(client);
2012 		goto done;
2013 	}
2014 
2015 	repo = find_repo_by_name(client->auth->repo_name);
2016 	if (repo == NULL) {
2017 		err = got_error(GOT_ERR_NOT_GIT_REPO);
2018 		goto done;
2019 	}
2020 	kill_auth_proc(client);
2021 
2022 	log_info("authenticated uid %d for repository %s\n",
2023 	    client->euid, repo->name);
2024 
2025 	if (client->required_auth & GOTD_AUTH_WRITE)
2026 		proc_type = PROC_REPO_WRITE;
2027 	else
2028 		proc_type = PROC_REPO_READ;
2029 
2030 	err = start_repo_child(client, proc_type, repo, gotd.argv0,
2031 	    gotd.confpath, gotd.daemonize, gotd.verbosity);
2032 done:
2033 	if (err)
2034 		log_warnx("uid %d: %s", client->euid, err->msg);
2035 
2036 	/* We might have killed the auth process by now. */
2037 	if (client->auth != NULL) {
2038 		if (!shut) {
2039 			gotd_imsg_event_add(iev);
2040 		} else {
2041 			/* This pipe is dead. Remove its event handler */
2042 			event_del(&iev->ev);
2043 		}
2044 	}
2045 }
2046 
2047 static void
2048 gotd_dispatch_repo_child(int fd, short event, void *arg)
2049 {
2050 	struct gotd_imsgev *iev = arg;
2051 	struct imsgbuf *ibuf = &iev->ibuf;
2052 	struct gotd_child_proc *proc = NULL;
2053 	struct gotd_client *client = NULL;
2054 	ssize_t n;
2055 	int shut = 0;
2056 	struct imsg imsg;
2057 
2058 	if (event & EV_READ) {
2059 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
2060 			fatal("imsg_read error");
2061 		if (n == 0) {
2062 			/* Connection closed. */
2063 			shut = 1;
2064 			goto done;
2065 		}
2066 	}
2067 
2068 	if (event & EV_WRITE) {
2069 		n = msgbuf_write(&ibuf->w);
2070 		if (n == -1 && errno != EAGAIN)
2071 			fatal("msgbuf_write");
2072 		if (n == 0) {
2073 			/* Connection closed. */
2074 			shut = 1;
2075 			goto done;
2076 		}
2077 	}
2078 
2079 	client = find_client_by_proc_fd(fd);
2080 	if (client == NULL)
2081 		fatalx("cannot find client for fd %d", fd);
2082 
2083 	proc = get_client_proc(client);
2084 	if (proc == NULL)
2085 		fatalx("cannot find child process for fd %d", fd);
2086 
2087 	for (;;) {
2088 		const struct got_error *err = NULL;
2089 		uint32_t client_id = 0;
2090 		int do_disconnect = 0;
2091 		int do_list_refs = 0, do_ref_updates = 0, do_ref_update = 0;
2092 		int do_packfile_install = 0;
2093 
2094 		if ((n = imsg_get(ibuf, &imsg)) == -1)
2095 			fatal("%s: imsg_get error", __func__);
2096 		if (n == 0)	/* No more messages. */
2097 			break;
2098 
2099 		switch (imsg.hdr.type) {
2100 		case GOTD_IMSG_ERROR:
2101 			do_disconnect = 1;
2102 			err = gotd_imsg_recv_error(&client_id, &imsg);
2103 			break;
2104 		case GOTD_IMSG_REPO_CHILD_READY:
2105 			do_list_refs = 1;
2106 			break;
2107 		case GOTD_IMSG_PACKFILE_DONE:
2108 			do_disconnect = 1;
2109 			err = recv_packfile_done(&client_id, &imsg);
2110 			break;
2111 		case GOTD_IMSG_PACKFILE_INSTALL:
2112 			err = recv_packfile_install(&client_id, &imsg);
2113 			if (err == NULL)
2114 				do_packfile_install = 1;
2115 			break;
2116 		case GOTD_IMSG_REF_UPDATES_START:
2117 			err = recv_ref_updates_start(&client_id, &imsg);
2118 			if (err == NULL)
2119 				do_ref_updates = 1;
2120 			break;
2121 		case GOTD_IMSG_REF_UPDATE:
2122 			err = recv_ref_update(&client_id, &imsg);
2123 			if (err == NULL)
2124 				do_ref_update = 1;
2125 			break;
2126 		default:
2127 			log_debug("unexpected imsg %d", imsg.hdr.type);
2128 			break;
2129 		}
2130 
2131 		if (!verify_imsg_src(client, proc, &imsg)) {
2132 			log_debug("dropping imsg type %d from PID %d",
2133 			    imsg.hdr.type, proc->pid);
2134 			imsg_free(&imsg);
2135 			continue;
2136 		}
2137 		if (err)
2138 			log_warnx("uid %d: %s", client->euid, err->msg);
2139 
2140 		if (do_disconnect) {
2141 			if (err)
2142 				disconnect_on_error(client, err);
2143 			else
2144 				disconnect(client);
2145 		} else {
2146 			if (do_list_refs)
2147 				err = list_refs_request(client, iev);
2148 			else if (do_packfile_install)
2149 				err = install_pack(client, proc->repo_path,
2150 				    &imsg);
2151 			else if (do_ref_updates)
2152 				err = begin_ref_updates(client, &imsg);
2153 			else if (do_ref_update)
2154 				err = update_ref(client, proc->repo_path,
2155 				    &imsg);
2156 			if (err)
2157 				log_warnx("uid %d: %s", client->euid, err->msg);
2158 		}
2159 		imsg_free(&imsg);
2160 	}
2161 done:
2162 	if (!shut) {
2163 		gotd_imsg_event_add(iev);
2164 	} else {
2165 		/* This pipe is dead. Remove its event handler */
2166 		event_del(&iev->ev);
2167 		event_loopexit(NULL);
2168 	}
2169 }
2170 
2171 static pid_t
2172 start_child(enum gotd_procid proc_id, const char *repo_path,
2173     char *argv0, const char *confpath, int fd, int daemonize, int verbosity)
2174 {
2175 	char	*argv[11];
2176 	int	 argc = 0;
2177 	pid_t	 pid;
2178 
2179 	switch (pid = fork()) {
2180 	case -1:
2181 		fatal("cannot fork");
2182 	case 0:
2183 		break;
2184 	default:
2185 		close(fd);
2186 		return pid;
2187 	}
2188 
2189 	if (fd != GOTD_FILENO_MSG_PIPE) {
2190 		if (dup2(fd, GOTD_FILENO_MSG_PIPE) == -1)
2191 			fatal("cannot setup imsg fd");
2192 	} else if (fcntl(fd, F_SETFD, 0) == -1)
2193 		fatal("cannot setup imsg fd");
2194 
2195 	argv[argc++] = argv0;
2196 	switch (proc_id) {
2197 	case PROC_LISTEN:
2198 		argv[argc++] = (char *)"-L";
2199 		break;
2200 	case PROC_AUTH:
2201 		argv[argc++] = (char *)"-A";
2202 		break;
2203 	case PROC_REPO_READ:
2204 		argv[argc++] = (char *)"-R";
2205 		break;
2206 	case PROC_REPO_WRITE:
2207 		argv[argc++] = (char *)"-W";
2208 		break;
2209 	default:
2210 		fatalx("invalid process id %d", proc_id);
2211 	}
2212 
2213 	argv[argc++] = (char *)"-f";
2214 	argv[argc++] = (char *)confpath;
2215 
2216 	if (repo_path) {
2217 		argv[argc++] = (char *)"-P";
2218 		argv[argc++] = (char *)repo_path;
2219 	}
2220 
2221 	if (!daemonize)
2222 		argv[argc++] = (char *)"-d";
2223 	if (verbosity > 0)
2224 		argv[argc++] = (char *)"-v";
2225 	if (verbosity > 1)
2226 		argv[argc++] = (char *)"-v";
2227 	argv[argc++] = NULL;
2228 
2229 	execvp(argv0, argv);
2230 	fatal("execvp");
2231 }
2232 
2233 static void
2234 start_listener(char *argv0, const char *confpath, int daemonize, int verbosity)
2235 {
2236 	struct gotd_child_proc *proc = &gotd.listen_proc;
2237 
2238 	proc->type = PROC_LISTEN;
2239 
2240 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
2241 	    PF_UNSPEC, proc->pipe) == -1)
2242 		fatal("socketpair");
2243 
2244 	proc->pid = start_child(proc->type, NULL, argv0, confpath,
2245 	    proc->pipe[1], daemonize, verbosity);
2246 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
2247 	proc->iev.handler = gotd_dispatch_listener;
2248 	proc->iev.events = EV_READ;
2249 	proc->iev.handler_arg = NULL;
2250 }
2251 
2252 static const struct got_error *
2253 start_repo_child(struct gotd_client *client, enum gotd_procid proc_type,
2254     struct gotd_repo *repo, char *argv0, const char *confpath,
2255     int daemonize, int verbosity)
2256 {
2257 	struct gotd_child_proc *proc;
2258 
2259 	if (proc_type != PROC_REPO_READ && proc_type != PROC_REPO_WRITE)
2260 		return got_error_msg(GOT_ERR_NOT_IMPL, "bad process type");
2261 
2262 	proc = calloc(1, sizeof(*proc));
2263 	if (proc == NULL)
2264 		return got_error_from_errno("calloc");
2265 
2266 	proc->type = proc_type;
2267 	if (strlcpy(proc->repo_name, repo->name,
2268 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
2269 		fatalx("repository name too long: %s", repo->name);
2270 	log_debug("starting %s for repository %s",
2271 	    proc->type == PROC_REPO_READ ? "reader" : "writer", repo->name);
2272 	if (realpath(repo->path, proc->repo_path) == NULL)
2273 		fatal("%s", repo->path);
2274 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
2275 	    PF_UNSPEC, proc->pipe) == -1)
2276 		fatal("socketpair");
2277 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
2278 	    confpath, proc->pipe[1], daemonize, verbosity);
2279 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
2280 	log_debug("proc %s %s is on fd %d",
2281 	    gotd_proc_names[proc->type], proc->repo_path,
2282 	    proc->pipe[0]);
2283 	proc->iev.handler = gotd_dispatch_repo_child;
2284 	proc->iev.events = EV_READ;
2285 	proc->iev.handler_arg = NULL;
2286 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
2287 	    gotd_dispatch_repo_child, &proc->iev);
2288 	gotd_imsg_event_add(&proc->iev);
2289 
2290 	if (proc->type == PROC_REPO_READ)
2291 		client->repo_read = proc;
2292 	else
2293 		client->repo_write = proc;
2294 
2295 	return NULL;
2296 }
2297 
2298 static const struct got_error *
2299 start_auth_child(struct gotd_client *client, int required_auth,
2300     struct gotd_repo *repo, char *argv0, const char *confpath,
2301     int daemonize, int verbosity)
2302 {
2303 	const struct got_error *err = NULL;
2304 	struct gotd_child_proc *proc;
2305 	struct gotd_imsg_auth iauth;
2306 	int fd;
2307 
2308 	memset(&iauth, 0, sizeof(iauth));
2309 
2310 	fd = dup(client->fd);
2311 	if (fd == -1)
2312 		return got_error_from_errno("dup");
2313 
2314 	proc = calloc(1, sizeof(*proc));
2315 	if (proc == NULL) {
2316 		err = got_error_from_errno("calloc");
2317 		close(fd);
2318 		return err;
2319 	}
2320 
2321 	proc->type = PROC_AUTH;
2322 	if (strlcpy(proc->repo_name, repo->name,
2323 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
2324 		fatalx("repository name too long: %s", repo->name);
2325 	log_debug("starting auth for uid %d repository %s",
2326 	    client->euid, repo->name);
2327 	if (realpath(repo->path, proc->repo_path) == NULL)
2328 		fatal("%s", repo->path);
2329 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
2330 	    PF_UNSPEC, proc->pipe) == -1)
2331 		fatal("socketpair");
2332 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
2333 	    confpath, proc->pipe[1], daemonize, verbosity);
2334 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
2335 	log_debug("proc %s %s is on fd %d",
2336 	    gotd_proc_names[proc->type], proc->repo_path,
2337 	    proc->pipe[0]);
2338 	proc->iev.handler = gotd_dispatch_auth_child;
2339 	proc->iev.events = EV_READ;
2340 	proc->iev.handler_arg = NULL;
2341 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
2342 	    gotd_dispatch_auth_child, &proc->iev);
2343 	gotd_imsg_event_add(&proc->iev);
2344 
2345 	iauth.euid = client->euid;
2346 	iauth.egid = client->egid;
2347 	iauth.required_auth = required_auth;
2348 	iauth.client_id = client->id;
2349 	if (gotd_imsg_compose_event(&proc->iev, GOTD_IMSG_AUTHENTICATE,
2350 	    PROC_GOTD, fd, &iauth, sizeof(iauth)) == -1) {
2351 		log_warn("imsg compose AUTHENTICATE");
2352 		close(fd);
2353 		/* Let the auth_timeout handler tidy up. */
2354 	}
2355 
2356 	client->auth = proc;
2357 	client->required_auth = required_auth;
2358 	return NULL;
2359 }
2360 
2361 static void
2362 apply_unveil_repo_readonly(const char *repo_path)
2363 {
2364 	if (unveil(repo_path, "r") == -1)
2365 		fatal("unveil %s", repo_path);
2366 
2367 	if (unveil(NULL, NULL) == -1)
2368 		fatal("unveil");
2369 }
2370 
2371 static void
2372 apply_unveil_none(void)
2373 {
2374 	if (unveil("/", "") == -1)
2375 		fatal("unveil");
2376 
2377 	if (unveil(NULL, NULL) == -1)
2378 		fatal("unveil");
2379 }
2380 
2381 static void
2382 apply_unveil(void)
2383 {
2384 	struct gotd_repo *repo;
2385 
2386 	if (unveil(gotd.argv0, "x") == -1)
2387 		fatal("unveil %s", gotd.argv0);
2388 
2389 	TAILQ_FOREACH(repo, &gotd.repos, entry) {
2390 		if (unveil(repo->path, "rwc") == -1)
2391 			fatal("unveil %s", repo->path);
2392 	}
2393 
2394 	if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
2395 		fatal("unveil %s", GOT_TMPDIR_STR);
2396 
2397 	if (unveil(NULL, NULL) == -1)
2398 		fatal("unveil");
2399 }
2400 
2401 int
2402 main(int argc, char **argv)
2403 {
2404 	const struct got_error *error = NULL;
2405 	int ch, fd = -1, daemonize = 1, verbosity = 0, noaction = 0;
2406 	const char *confpath = GOTD_CONF_PATH;
2407 	char *argv0 = argv[0];
2408 	char title[2048];
2409 	gid_t groups[NGROUPS_MAX];
2410 	int ngroups = NGROUPS_MAX;
2411 	struct passwd *pw = NULL;
2412 	struct group *gr = NULL;
2413 	char *repo_path = NULL;
2414 	enum gotd_procid proc_id = PROC_GOTD;
2415 	struct event evsigint, evsigterm, evsighup, evsigusr1;
2416 	int *pack_fds = NULL, *temp_fds = NULL;
2417 
2418 	log_init(1, LOG_DAEMON); /* Log to stderr until daemonized. */
2419 
2420 	while ((ch = getopt(argc, argv, "Adf:LnP:RvW")) != -1) {
2421 		switch (ch) {
2422 		case 'A':
2423 			proc_id = PROC_AUTH;
2424 			break;
2425 		case 'd':
2426 			daemonize = 0;
2427 			break;
2428 		case 'f':
2429 			confpath = optarg;
2430 			break;
2431 		case 'L':
2432 			proc_id = PROC_LISTEN;
2433 			break;
2434 		case 'n':
2435 			noaction = 1;
2436 			break;
2437 		case 'P':
2438 			repo_path = realpath(optarg, NULL);
2439 			if (repo_path == NULL)
2440 				fatal("realpath '%s'", optarg);
2441 			break;
2442 		case 'R':
2443 			proc_id = PROC_REPO_READ;
2444 			break;
2445 		case 'v':
2446 			if (verbosity < 3)
2447 				verbosity++;
2448 			break;
2449 		case 'W':
2450 			proc_id = PROC_REPO_WRITE;
2451 			break;
2452 		default:
2453 			usage();
2454 		}
2455 	}
2456 
2457 	argc -= optind;
2458 	argv += optind;
2459 
2460 	if (argc != 0)
2461 		usage();
2462 
2463 	/* Require an absolute path in argv[0] for reliable re-exec. */
2464 	if (!got_path_is_absolute(argv0))
2465 		fatalx("bad path \"%s\": must be an absolute path", argv0);
2466 
2467 	if (geteuid() && (proc_id == PROC_GOTD || proc_id == PROC_LISTEN))
2468 		fatalx("need root privileges");
2469 
2470 	log_init(daemonize ? 0 : 1, LOG_DAEMON);
2471 	log_setverbose(verbosity);
2472 
2473 	if (parse_config(confpath, proc_id, &gotd) != 0)
2474 		return 1;
2475 
2476 	gotd.argv0 = argv0;
2477 	gotd.daemonize = daemonize;
2478 	gotd.verbosity = verbosity;
2479 	gotd.confpath = confpath;
2480 
2481 	if (proc_id == PROC_GOTD &&
2482 	    (gotd.nrepos == 0 || TAILQ_EMPTY(&gotd.repos)))
2483 		fatalx("no repository defined in configuration file");
2484 
2485 	pw = getpwnam(gotd.user_name);
2486 	if (pw == NULL)
2487 		fatalx("user %s not found", gotd.user_name);
2488 
2489 	if (pw->pw_uid == 0) {
2490 		fatalx("cannot run %s as %s: the user running %s "
2491 		    "must not be the superuser",
2492 		    getprogname(), pw->pw_name, getprogname());
2493 	}
2494 
2495 	if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups) == -1)
2496 		log_warnx("group membership list truncated");
2497 
2498 	gr = match_group(groups, ngroups, gotd.unix_group_name);
2499 	if (gr == NULL) {
2500 		fatalx("cannot start %s: the user running %s "
2501 		    "must be a secondary member of group %s",
2502 		    getprogname(), getprogname(), gotd.unix_group_name);
2503 	}
2504 	if (gr->gr_gid == pw->pw_gid) {
2505 		fatalx("cannot start %s: the user running %s "
2506 		    "must be a secondary member of group %s, but "
2507 		    "%s is the user's primary group",
2508 		    getprogname(), getprogname(), gotd.unix_group_name,
2509 		    gotd.unix_group_name);
2510 	}
2511 
2512 	if (proc_id == PROC_LISTEN &&
2513 	    !got_path_is_absolute(gotd.unix_socket_path))
2514 		fatalx("bad unix socket path \"%s\": must be an absolute path",
2515 		    gotd.unix_socket_path);
2516 
2517 	if (noaction)
2518 		return 0;
2519 
2520 	if (proc_id == PROC_GOTD) {
2521 		gotd.pid = getpid();
2522 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
2523 		start_listener(argv0, confpath, daemonize, verbosity);
2524 		arc4random_buf(&clients_hash_key, sizeof(clients_hash_key));
2525 		if (daemonize && daemon(1, 0) == -1)
2526 			fatal("daemon");
2527 	} else if (proc_id == PROC_LISTEN) {
2528 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
2529 		if (verbosity) {
2530 			log_info("socket: %s", gotd.unix_socket_path);
2531 			log_info("user: %s", pw->pw_name);
2532 			log_info("secondary group: %s", gr->gr_name);
2533 		}
2534 
2535 		fd = unix_socket_listen(gotd.unix_socket_path, pw->pw_uid,
2536 		    gr->gr_gid);
2537 		if (fd == -1) {
2538 			fatal("cannot listen on unix socket %s",
2539 			    gotd.unix_socket_path);
2540 		}
2541 		if (daemonize && daemon(0, 0) == -1)
2542 			fatal("daemon");
2543 	} else if (proc_id == PROC_AUTH) {
2544 		snprintf(title, sizeof(title), "%s %s",
2545 		    gotd_proc_names[proc_id], repo_path);
2546 		if (daemonize && daemon(0, 0) == -1)
2547 			fatal("daemon");
2548 	} else if (proc_id == PROC_REPO_READ || proc_id == PROC_REPO_WRITE) {
2549 		error = got_repo_pack_fds_open(&pack_fds);
2550 		if (error != NULL)
2551 			fatalx("cannot open pack tempfiles: %s", error->msg);
2552 		error = got_repo_temp_fds_open(&temp_fds);
2553 		if (error != NULL)
2554 			fatalx("cannot open pack tempfiles: %s", error->msg);
2555 		if (repo_path == NULL)
2556 			fatalx("repository path not specified");
2557 		snprintf(title, sizeof(title), "%s %s",
2558 		    gotd_proc_names[proc_id], repo_path);
2559 		if (daemonize && daemon(0, 0) == -1)
2560 			fatal("daemon");
2561 	} else
2562 		fatal("invalid process id %d", proc_id);
2563 
2564 	setproctitle("%s", title);
2565 	log_procinit(title);
2566 
2567 	/* Drop root privileges. */
2568 	if (setgid(pw->pw_gid) == -1)
2569 		fatal("setgid %d failed", pw->pw_gid);
2570 	if (setuid(pw->pw_uid) == -1)
2571 		fatal("setuid %d failed", pw->pw_uid);
2572 
2573 	event_init();
2574 
2575 	switch (proc_id) {
2576 	case PROC_GOTD:
2577 #ifndef PROFILE
2578 		if (pledge("stdio rpath wpath cpath proc exec "
2579 		    "sendfd recvfd fattr flock unveil", NULL) == -1)
2580 			err(1, "pledge");
2581 #endif
2582 		break;
2583 	case PROC_LISTEN:
2584 #ifndef PROFILE
2585 		if (pledge("stdio sendfd unix", NULL) == -1)
2586 			err(1, "pledge");
2587 #endif
2588 		listen_main(title, fd);
2589 		/* NOTREACHED */
2590 		break;
2591 	case PROC_AUTH:
2592 #ifndef PROFILE
2593 		if (pledge("stdio getpw recvfd unix unveil", NULL) == -1)
2594 			err(1, "pledge");
2595 #endif
2596 		/*
2597 		 * We need the "unix" pledge promise for getpeername(2) only.
2598 		 * Ensure that AF_UNIX bind(2) cannot be used by revoking all
2599 		 * filesystem access via unveil(2). Access to password database
2600 		 * files will still work since "getpw" bypasses unveil(2).
2601 		 */
2602 		apply_unveil_none();
2603 
2604 		auth_main(title, &gotd.repos, repo_path);
2605 		/* NOTREACHED */
2606 		break;
2607 	case PROC_REPO_READ:
2608 #ifndef PROFILE
2609 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
2610 			err(1, "pledge");
2611 #endif
2612 		apply_unveil_repo_readonly(repo_path);
2613 		repo_read_main(title, repo_path, pack_fds, temp_fds);
2614 		/* NOTREACHED */
2615 		exit(0);
2616 	case PROC_REPO_WRITE:
2617 #ifndef PROFILE
2618 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
2619 			err(1, "pledge");
2620 #endif
2621 		apply_unveil_repo_readonly(repo_path);
2622 		repo_write_main(title, repo_path, pack_fds, temp_fds);
2623 		/* NOTREACHED */
2624 		exit(0);
2625 	default:
2626 		fatal("invalid process id %d", proc_id);
2627 	}
2628 
2629 	if (proc_id != PROC_GOTD)
2630 		fatal("invalid process id %d", proc_id);
2631 
2632 	apply_unveil();
2633 
2634 	signal_set(&evsigint, SIGINT, gotd_sighdlr, NULL);
2635 	signal_set(&evsigterm, SIGTERM, gotd_sighdlr, NULL);
2636 	signal_set(&evsighup, SIGHUP, gotd_sighdlr, NULL);
2637 	signal_set(&evsigusr1, SIGUSR1, gotd_sighdlr, NULL);
2638 	signal(SIGPIPE, SIG_IGN);
2639 
2640 	signal_add(&evsigint, NULL);
2641 	signal_add(&evsigterm, NULL);
2642 	signal_add(&evsighup, NULL);
2643 	signal_add(&evsigusr1, NULL);
2644 
2645 	gotd_imsg_event_add(&gotd.listen_proc.iev);
2646 
2647 	event_dispatch();
2648 
2649 	if (pack_fds)
2650 		got_repo_pack_fds_close(pack_fds);
2651 	free(repo_path);
2652 	return 0;
2653 }