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Date:: Tue Nov 14 11:00:13 2023 UTC
Message:: reduce gotwebd pledges to the minimum currently required; with op@
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1 /*
2  * Copyright (c) 2016, 2019, 2020-2021 Tracey Emery <tracey@traceyemery.net>
3  * Copyright (c) 2015 Mike Larkin <mlarkin@openbsd.org>
4  * Copyright (c) 2013 David Gwynne <dlg@openbsd.org>
5  * Copyright (c) 2013 Florian Obser <florian@openbsd.org>
6  *
7  * Permission to use, copy, modify, and distribute this software for any
8  * purpose with or without fee is hereby granted, provided that the above
9  * copyright notice and this permission notice appear in all copies.
10  *
11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18  */
19 
20 #include <sys/param.h>
21 #include <sys/ioctl.h>
22 #include <sys/queue.h>
23 #include <sys/wait.h>
24 #include <sys/uio.h>
25 #include <sys/resource.h>
26 #include <sys/socket.h>
27 #include <sys/stat.h>
28 #include <sys/time.h>
29 #include <sys/types.h>
30 #include <sys/mman.h>
31 #include <sys/un.h>
32 
33 #include <net/if.h>
34 #include <netinet/in.h>
35 
36 #include <errno.h>
37 #include <event.h>
38 #include <fcntl.h>
39 #include <ifaddrs.h>
40 #include <imsg.h>
41 #include <limits.h>
42 #include <netdb.h>
43 #include <poll.h>
44 #include <pwd.h>
45 #include <stddef.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <string.h>
49 #include <unistd.h>
50 #include <util.h>
51 
52 #include "got_error.h"
53 #include "got_opentemp.h"
54 #include "got_reference.h"
55 #include "got_repository.h"
56 #include "got_privsep.h"
57 
58 #include "proc.h"
59 #include "gotwebd.h"
60 #include "tmpl.h"
61 
62 #define SOCKS_BACKLOG 5
63 #define MAXIMUM(a, b)	(((a) > (b)) ? (a) : (b))
64 
65 
66 volatile int client_cnt;
67 
68 static struct timeval	timeout = { TIMEOUT_DEFAULT, 0 };
69 
70 static void	 sockets_sighdlr(int, short, void *);
71 static void	 sockets_run(struct privsep *, struct privsep_proc *, void *);
72 static void	 sockets_launch(void);
73 static void	 sockets_purge(struct gotwebd *);
74 static void	 sockets_accept_paused(int, short, void *);
75 static void	 sockets_rlimit(int);
76 
77 static int	 sockets_dispatch_gotwebd(int, struct privsep_proc *,
78 		    struct imsg *);
79 static int	 sockets_unix_socket_listen(struct privsep *, struct socket *);
80 static int	 sockets_create_socket(struct address *, in_port_t);
81 static int	 sockets_accept_reserve(int, struct sockaddr *, socklen_t *,
82 		    int, volatile int *);
83 
84 static struct socket *sockets_conf_new_socket_unix(struct gotwebd *,
85 		    struct server *, int);
86 static struct socket *sockets_conf_new_socket_fcgi(struct gotwebd *,
87 		    struct server *, int, struct address *);
88 
89 int cgi_inflight = 0;
90 
91 static struct privsep_proc procs[] = {
92 	{ "gotwebd",	PROC_GOTWEBD,	sockets_dispatch_gotwebd  },
93 };
94 
95 void
96 sockets(struct privsep *ps, struct privsep_proc *p)
97 {
98 	proc_run(ps, p, procs, nitems(procs), sockets_run, NULL);
99 }
100 
101 static void
102 sockets_run(struct privsep *ps, struct privsep_proc *p, void *arg)
103 {
104 	if (config_init(ps->ps_env) == -1)
105 		fatal("failed to initialize configuration");
106 
107 	p->p_shutdown = sockets_shutdown;
108 
109 	sockets_rlimit(-1);
110 
111 	signal_del(&ps->ps_evsigchld);
112 	signal_set(&ps->ps_evsigchld, SIGCHLD, sockets_sighdlr, ps);
113 	signal_add(&ps->ps_evsigchld, NULL);
114 
115 #ifndef PROFILE
116 	if (pledge("stdio rpath inet recvfd proc exec sendfd unveil",
117 	    NULL) == -1)
118 		fatal("pledge");
119 #endif
120 }
121 
122 void
123 sockets_parse_sockets(struct gotwebd *env)
124 {
125 	struct server *srv;
126 	struct address *a;
127 	struct socket *new_sock = NULL;
128 	int sock_id = 1;
129 
130 	TAILQ_FOREACH(srv, &env->servers, entry) {
131 		if (srv->unix_socket) {
132 			new_sock = sockets_conf_new_socket_unix(env, srv,
133 			    sock_id);
134 			if (new_sock) {
135 				sock_id++;
136 				TAILQ_INSERT_TAIL(&env->sockets, new_sock,
137 				    entry);
138 			}
139 		}
140 
141 		if (srv->fcgi_socket) {
142 			if (TAILQ_EMPTY(&srv->al)) {
143 				fatalx("%s: server %s has no IP addresses to "
144 				    "listen for FCGI connections", __func__,
145 				    srv->name);
146 			}
147 			TAILQ_FOREACH(a, &srv->al, entry) {
148 				if (a->ss.ss_family != AF_INET &&
149 				    a->ss.ss_family != AF_INET6)
150 					continue;
151 				new_sock = sockets_conf_new_socket_fcgi(env,
152 				    srv, sock_id, a);
153 				if (new_sock) {
154 					sock_id++;
155 					TAILQ_INSERT_TAIL(&env->sockets,
156 					    new_sock, entry);
157 				}
158 			}
159 		}
160 	}
161 }
162 
163 static struct socket *
164 sockets_conf_new_socket_unix(struct gotwebd *env, struct server *srv, int id)
165 {
166 	struct socket *sock;
167 	int n;
168 
169 	if ((sock = calloc(1, sizeof(*sock))) == NULL)
170 		fatalx("%s: calloc", __func__);
171 
172 	sock->conf.id = id;
173 	sock->fd = -1;
174 	sock->conf.af_type = AF_UNIX;
175 
176 	if (strlcpy(sock->conf.unix_socket_name,
177 	    srv->unix_socket_name,
178 	    sizeof(sock->conf.unix_socket_name)) >=
179 	    sizeof(sock->conf.unix_socket_name)) {
180 		free(sock);
181 		fatalx("%s: strlcpy", __func__);
182 	}
183 
184 	n = snprintf(sock->conf.name, GOTWEBD_MAXTEXT, "%s_parent",
185 	    srv->name);
186 	if (n < 0 || (size_t)n >= GOTWEBD_MAXTEXT) {
187 		free(sock);
188 		fatalx("%s: snprintf", __func__);
189 	}
190 
191 	if (strlcpy(sock->conf.srv_name, srv->name,
192 	    sizeof(sock->conf.srv_name)) >= sizeof(sock->conf.srv_name)) {
193 		free(sock);
194 		fatalx("%s: strlcpy", __func__);
195 	}
196 
197 	return sock;
198 }
199 
200 static struct socket *
201 sockets_conf_new_socket_fcgi(struct gotwebd *env, struct server *srv, int id,
202     struct address *a)
203 {
204 	struct socket *sock;
205 	struct address *acp;
206 	int n;
207 
208 	if ((sock = calloc(1, sizeof(*sock))) == NULL)
209 		fatalx("%s: calloc", __func__);
210 
211 	sock->conf.id = id;
212 	sock->fd = -1;
213 	sock->conf.af_type = a->ss.ss_family;
214 
215 	sock->conf.fcgi_socket_port = a->port;
216 
217 	n = snprintf(sock->conf.name, GOTWEBD_MAXTEXT, "%s_parent",
218 	    srv->name);
219 	if (n < 0 || (size_t)n >= GOTWEBD_MAXTEXT) {
220 		free(sock);
221 		fatalx("%s: snprintf", __func__);
222 	}
223 
224 	if (strlcpy(sock->conf.srv_name, srv->name,
225 	    sizeof(sock->conf.srv_name)) >= sizeof(sock->conf.srv_name)) {
226 		free(sock);
227 		fatalx("%s: strlcpy", __func__);
228 	}
229 
230 	acp = &sock->conf.addr;
231 
232 	memcpy(&acp->ss, &a->ss, sizeof(acp->ss));
233 	acp->ipproto = a->ipproto;
234 	acp->port = a->port;
235 	if (*a->ifname != '\0') {
236 		if (strlcpy(acp->ifname, a->ifname,
237 		    sizeof(acp->ifname)) >= sizeof(acp->ifname)) {
238 			fatalx("%s: interface name truncated",
239 			    __func__);
240 		}
241 	}
242 
243 	return (sock);
244 }
245 
246 static void
247 sockets_launch(void)
248 {
249 	struct socket *sock;
250 	struct server *srv;
251 	const struct got_error *error;
252 
253 	TAILQ_FOREACH(sock, &gotwebd_env->sockets, entry) {
254 		log_debug("%s: configuring socket %d (%d)", __func__,
255 		    sock->conf.id, sock->fd);
256 
257 		event_set(&sock->ev, sock->fd, EV_READ | EV_PERSIST,
258 		    sockets_socket_accept, sock);
259 
260 		if (event_add(&sock->ev, NULL))
261 			fatalx("event add sock");
262 
263 		evtimer_set(&sock->pause, sockets_accept_paused, sock);
264 
265 		log_debug("%s: running socket listener %d", __func__,
266 		    sock->conf.id);
267 	}
268 
269 	TAILQ_FOREACH(srv, &gotwebd_env->servers, entry) {
270 		if (unveil(srv->repos_path, "r") == -1)
271 			fatal("unveil %s", srv->repos_path);
272 	}
273 
274 	error = got_privsep_unveil_exec_helpers();
275 	if (error)
276 		fatal("%s", error->msg);
277 
278 	if (unveil(NULL, NULL) == -1)
279 		fatal("unveil");
280 }
281 
282 static void
283 sockets_purge(struct gotwebd *env)
284 {
285 	struct socket *sock, *tsock;
286 
287 	/* shutdown and remove sockets */
288 	TAILQ_FOREACH_SAFE(sock, &env->sockets, entry, tsock) {
289 		if (event_initialized(&sock->ev))
290 			event_del(&sock->ev);
291 		if (evtimer_initialized(&sock->evt))
292 			evtimer_del(&sock->evt);
293 		if (evtimer_initialized(&sock->pause))
294 			evtimer_del(&sock->pause);
295 		if (sock->fd != -1)
296 			close(sock->fd);
297 		TAILQ_REMOVE(&env->sockets, sock, entry);
298 	}
299 }
300 
301 static int
302 sockets_dispatch_gotwebd(int fd, struct privsep_proc *p, struct imsg *imsg)
303 {
304 	struct privsep *ps = p->p_ps;
305 	int res = 0, cmd = 0, verbose;
306 
307 	switch (imsg->hdr.type) {
308 	case IMSG_CFG_SRV:
309 		config_getserver(gotwebd_env, imsg);
310 		break;
311 	case IMSG_CFG_SOCK:
312 		config_getsock(gotwebd_env, imsg);
313 		break;
314 	case IMSG_CFG_FD:
315 		config_getfd(gotwebd_env, imsg);
316 		break;
317 	case IMSG_CFG_DONE:
318 		config_getcfg(gotwebd_env, imsg);
319 		break;
320 	case IMSG_CTL_START:
321 		sockets_launch();
322 		break;
323 	case IMSG_CTL_VERBOSE:
324 		IMSG_SIZE_CHECK(imsg, &verbose);
325 		memcpy(&verbose, imsg->data, sizeof(verbose));
326 		log_setverbose(verbose);
327 		break;
328 	default:
329 		return -1;
330 	}
331 
332 	switch (cmd) {
333 	case 0:
334 		break;
335 	default:
336 		if (proc_compose_imsg(ps, PROC_GOTWEBD, -1, cmd,
337 		    imsg->hdr.peerid, -1, &res, sizeof(res)) == -1)
338 			return -1;
339 		break;
340 	}
341 
342 	return 0;
343 }
344 
345 static void
346 sockets_sighdlr(int sig, short event, void *arg)
347 {
348 	switch (sig) {
349 	case SIGHUP:
350 		log_info("%s: ignoring SIGHUP", __func__);
351 		break;
352 	case SIGPIPE:
353 		log_info("%s: ignoring SIGPIPE", __func__);
354 		break;
355 	case SIGUSR1:
356 		log_info("%s: ignoring SIGUSR1", __func__);
357 		break;
358 	case SIGCHLD:
359 		break;
360 	default:
361 		log_info("SIGNAL: %d", sig);
362 		fatalx("unexpected signal");
363 	}
364 }
365 
366 void
367 sockets_shutdown(void)
368 {
369 	struct server *srv, *tsrv;
370 	struct socket *sock, *tsock;
371 	int i;
372 
373 	sockets_purge(gotwebd_env);
374 
375 	/* clean sockets */
376 	TAILQ_FOREACH_SAFE(sock, &gotwebd_env->sockets, entry, tsock) {
377 		TAILQ_REMOVE(&gotwebd_env->sockets, sock, entry);
378 		close(sock->fd);
379 		free(sock);
380 	}
381 
382 	/* clean servers */
383 	TAILQ_FOREACH_SAFE(srv, &gotwebd_env->servers, entry, tsrv) {
384 		for (i = 0; i < srv->ncached_repos; i++)
385 			got_repo_close(srv->cached_repos[i].repo);
386 		free(srv);
387 	}
388 
389 	free(gotwebd_env);
390 }
391 
392 int
393 sockets_privinit(struct gotwebd *env, struct socket *sock)
394 {
395 	struct privsep *ps = env->gotwebd_ps;
396 
397 	if (sock->conf.af_type == AF_UNIX) {
398 		log_debug("%s: initializing unix socket %s", __func__,
399 		    sock->conf.unix_socket_name);
400 		sock->fd = sockets_unix_socket_listen(ps, sock);
401 		if (sock->fd == -1) {
402 			log_warnx("%s: create unix socket failed", __func__);
403 			return -1;
404 		}
405 	}
406 
407 	if (sock->conf.af_type == AF_INET || sock->conf.af_type == AF_INET6) {
408 		log_debug("%s: initializing %s FCGI socket on port %d for %s",
409 		    __func__, sock->conf.af_type == AF_INET ? "inet" : "inet6",
410 		    sock->conf.fcgi_socket_port, sock->conf.name);
411 		sock->fd = sockets_create_socket(&sock->conf.addr,
412 		    sock->conf.fcgi_socket_port);
413 		if (sock->fd == -1) {
414 			log_warnx("%s: create FCGI socket failed", __func__);
415 			return -1;
416 		}
417 	}
418 
419 	return 0;
420 }
421 
422 static int
423 sockets_unix_socket_listen(struct privsep *ps, struct socket *sock)
424 {
425 	struct gotwebd *env = ps->ps_env;
426 	struct sockaddr_un sun;
427 	struct socket *tsock;
428 	int u_fd = -1;
429 	mode_t old_umask, mode;
430 
431 	TAILQ_FOREACH(tsock, &env->sockets, entry) {
432 		if (strcmp(tsock->conf.unix_socket_name,
433 		    sock->conf.unix_socket_name) == 0 &&
434 		    tsock->fd != -1)
435 			return (tsock->fd);
436 	}
437 
438 	u_fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK| SOCK_CLOEXEC, 0);
439 	if (u_fd == -1) {
440 		log_warn("%s: socket", __func__);
441 		return -1;
442 	}
443 
444 	sun.sun_family = AF_UNIX;
445 	if (strlcpy(sun.sun_path, sock->conf.unix_socket_name,
446 	    sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
447 		log_warn("%s: %s name too long", __func__,
448 		    sock->conf.unix_socket_name);
449 		close(u_fd);
450 		return -1;
451 	}
452 
453 	if (unlink(sock->conf.unix_socket_name) == -1) {
454 		if (errno != ENOENT) {
455 			log_warn("%s: unlink %s", __func__,
456 			    sock->conf.unix_socket_name);
457 			close(u_fd);
458 			return -1;
459 		}
460 	}
461 
462 	old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
463 	mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP;
464 
465 	if (bind(u_fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
466 		log_warn("%s: bind: %s", __func__, sock->conf.unix_socket_name);
467 		close(u_fd);
468 		(void)umask(old_umask);
469 		return -1;
470 	}
471 
472 	(void)umask(old_umask);
473 
474 	if (chmod(sock->conf.unix_socket_name, mode) == -1) {
475 		log_warn("%s: chmod", __func__);
476 		close(u_fd);
477 		(void)unlink(sock->conf.unix_socket_name);
478 		return -1;
479 	}
480 
481 	if (chown(sock->conf.unix_socket_name, ps->ps_pw->pw_uid,
482 	    ps->ps_pw->pw_gid) == -1) {
483 		log_warn("%s: chown", __func__);
484 		close(u_fd);
485 		(void)unlink(sock->conf.unix_socket_name);
486 		return -1;
487 	}
488 
489 	if (listen(u_fd, SOCKS_BACKLOG) == -1) {
490 		log_warn("%s: listen", __func__);
491 		return -1;
492 	}
493 
494 	return u_fd;
495 }
496 
497 static int
498 sockets_create_socket(struct address *a, in_port_t port)
499 {
500 	struct addrinfo hints;
501 	int fd = -1, o_val = 1, flags;
502 
503 	memset(&hints, 0, sizeof(hints));
504 	hints.ai_family = AF_UNSPEC;
505 	hints.ai_socktype = SOCK_STREAM;
506 	hints.ai_flags |= AI_PASSIVE;
507 
508 	switch (a->ss.ss_family) {
509 	case AF_INET:
510 		((struct sockaddr_in *)(&a->ss))->sin_port = htons(port);
511 		break;
512 	case AF_INET6:
513 		((struct sockaddr_in6 *)(&a->ss))->sin6_port = htons(port);
514 		break;
515 	default:
516 		log_warnx("%s: unknown address family", __func__);
517 		return -1;
518 	}
519 
520 	fd = socket(a->ss.ss_family, hints.ai_socktype, a->ipproto);
521 	if (fd == -1)
522 		return -1;
523 
524 	log_debug("%s: opened socket (%d) for %s", __func__,
525 	    fd, a->ifname);
526 
527 	if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &o_val,
528 	    sizeof(int)) == -1) {
529 		log_warn("%s: setsockopt error", __func__);
530 		close(fd);
531 		return -1;
532 	}
533 
534 	/* non-blocking */
535 	flags = fcntl(fd, F_GETFL);
536 	flags |= O_NONBLOCK;
537 	if (fcntl(fd, F_SETFL, flags) == -1) {
538 		log_info("%s: could not enable non-blocking I/O", __func__);
539 		close(fd);
540 		return -1;
541 	}
542 
543 	if (bind(fd, (struct sockaddr *)&a->ss, a->ss.ss_len) == -1) {
544 		close(fd);
545 		log_info("%s: can't bind to port %d", __func__,
546 		    ntohs(port));
547 		return -1;
548 	}
549 
550 	if (listen(fd, SOMAXCONN) == -1) {
551 		log_warn("%s, unable to listen on socket", __func__);
552 		close(fd);
553 		return -1;
554 	}
555 
556 	return (fd);
557 }
558 
559 static int
560 sockets_accept_reserve(int sockfd, struct sockaddr *addr, socklen_t *addrlen,
561     int reserve, volatile int *counter)
562 {
563 	int ret;
564 
565 	if (getdtablecount() + reserve +
566 	    ((*counter + 1) * FD_NEEDED) >= getdtablesize()) {
567 		log_debug("inflight fds exceeded");
568 		errno = EMFILE;
569 		return -1;
570 	}
571 
572 	if ((ret = accept4(sockfd, addr, addrlen,
573 	    SOCK_NONBLOCK | SOCK_CLOEXEC)) > -1) {
574 		(*counter)++;
575 		log_debug("inflight incremented, now %d", *counter);
576 	}
577 
578 	return ret;
579 }
580 
581 static void
582 sockets_accept_paused(int fd, short events, void *arg)
583 {
584 	struct socket *sock = (struct socket *)arg;
585 
586 	event_add(&sock->ev, NULL);
587 }
588 
589 void
590 sockets_socket_accept(int fd, short event, void *arg)
591 {
592 	struct socket *sock = (struct socket *)arg;
593 	struct sockaddr_storage ss;
594 	struct timeval backoff;
595 	struct request *c = NULL;
596 	socklen_t len;
597 	int s;
598 
599 	backoff.tv_sec = 1;
600 	backoff.tv_usec = 0;
601 
602 	event_add(&sock->ev, NULL);
603 	if (event & EV_TIMEOUT)
604 		return;
605 
606 	len = sizeof(ss);
607 
608 	s = sockets_accept_reserve(fd, (struct sockaddr *)&ss, &len,
609 	    FD_RESERVE, &cgi_inflight);
610 
611 	if (s == -1) {
612 		switch (errno) {
613 		case EINTR:
614 		case EWOULDBLOCK:
615 		case ECONNABORTED:
616 			return;
617 		case EMFILE:
618 		case ENFILE:
619 			event_del(&sock->ev);
620 			evtimer_add(&sock->pause, &backoff);
621 			return;
622 		default:
623 			log_warn("%s: accept", __func__);
624 		}
625 	}
626 
627 	if (client_cnt > GOTWEBD_MAXCLIENTS)
628 		goto err;
629 
630 	c = calloc(1, sizeof(struct request));
631 	if (c == NULL) {
632 		log_warn("%s", __func__);
633 		close(s);
634 		cgi_inflight--;
635 		return;
636 	}
637 
638 	c->tp = template(c, &fcgi_write, c->outbuf, sizeof(c->outbuf));
639 	if (c->tp == NULL) {
640 		log_warn("%s", __func__);
641 		close(s);
642 		cgi_inflight--;
643 		free(c);
644 		return;
645 	}
646 
647 	c->fd = s;
648 	c->sock = sock;
649 	memcpy(c->priv_fd, sock->priv_fd, sizeof(c->priv_fd));
650 	c->buf_pos = 0;
651 	c->buf_len = 0;
652 	c->request_started = 0;
653 	c->sock->client_status = CLIENT_CONNECT;
654 
655 	event_set(&c->ev, s, EV_READ|EV_PERSIST, fcgi_request, c);
656 	event_add(&c->ev, NULL);
657 
658 	evtimer_set(&c->tmo, fcgi_timeout, c);
659 	evtimer_add(&c->tmo, &timeout);
660 
661 	client_cnt++;
662 
663 	return;
664 err:
665 	cgi_inflight--;
666 	close(s);
667 	if (c != NULL)
668 		free(c);
669 }
670 
671 static void
672 sockets_rlimit(int maxfd)
673 {
674 	struct rlimit rl;
675 
676 	if (getrlimit(RLIMIT_NOFILE, &rl) == -1)
677 		fatal("%s: failed to get resource limit", __func__);
678 	log_debug("%s: max open files %llu", __func__,
679 	    (unsigned long long)rl.rlim_max);
680 
681 	/*
682 	 * Allow the maximum number of open file descriptors for this
683 	 * login class (which should be the class "daemon" by default).
684 	 */
685 	if (maxfd == -1)
686 		rl.rlim_cur = rl.rlim_max;
687 	else
688 		rl.rlim_cur = MAXIMUM(rl.rlim_max, (rlim_t)maxfd);
689 	if (setrlimit(RLIMIT_NOFILE, &rl) == -1)
690 		fatal("%s: failed to set resource limit", __func__);
691 }