Blob


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 */
20 #include "got_compat.h"
22 #include <sys/param.h>
23 #include <sys/ioctl.h>
24 #include <sys/queue.h>
25 #include <sys/wait.h>
26 #include <sys/uio.h>
27 #include <sys/resource.h>
28 #include <sys/socket.h>
29 #include <sys/stat.h>
30 #include <sys/time.h>
31 #include <sys/types.h>
32 #include <sys/mman.h>
33 #include <sys/un.h>
35 #include <net/if.h>
36 #include <netinet/in.h>
38 #include <errno.h>
39 #include <event.h>
40 #include <fcntl.h>
41 #include <ifaddrs.h>
42 #include <limits.h>
43 #include <netdb.h>
44 #include <poll.h>
45 #include <pwd.h>
46 #include <stddef.h>
47 #include <stdio.h>
48 #include <stdlib.h>
49 #include <string.h>
50 #include <unistd.h>
52 #include "got_error.h"
53 #include "got_opentemp.h"
54 #include "got_reference.h"
55 #include "got_repository.h"
57 #include "proc.h"
58 #include "gotwebd.h"
59 #include "tmpl.h"
61 #define SOCKS_BACKLOG 5
62 #define MAXIMUM(a, b) (((a) > (b)) ? (a) : (b))
65 volatile int client_cnt;
67 static struct timeval timeout = { TIMEOUT_DEFAULT, 0 };
69 static void sockets_sighdlr(int, short, void *);
70 static void sockets_run(struct privsep *, struct privsep_proc *, void *);
71 static void sockets_launch(void);
72 static void sockets_purge(struct gotwebd *);
73 static void sockets_accept_paused(int, short, void *);
74 static void sockets_rlimit(int);
76 static int sockets_dispatch_gotwebd(int, struct privsep_proc *,
77 struct imsg *);
78 static int sockets_unix_socket_listen(struct privsep *, struct socket *);
79 static int sockets_create_socket(struct address *, in_port_t);
80 static int sockets_accept_reserve(int, struct sockaddr *, socklen_t *,
81 int, volatile int *);
83 static struct socket *sockets_conf_new_socket_unix(struct gotwebd *,
84 struct server *, int);
85 static struct socket *sockets_conf_new_socket_fcgi(struct gotwebd *,
86 struct server *, int, struct address *);
88 int cgi_inflight = 0;
90 static struct privsep_proc procs[] = {
91 { "gotwebd", PROC_GOTWEBD, sockets_dispatch_gotwebd },
92 };
94 void
95 sockets(struct privsep *ps, struct privsep_proc *p)
96 {
97 proc_run(ps, p, procs, nitems(procs), sockets_run, NULL);
98 }
100 static void
101 sockets_run(struct privsep *ps, struct privsep_proc *p, void *arg)
103 if (config_init(ps->ps_env) == -1)
104 fatal("failed to initialize configuration");
106 p->p_shutdown = sockets_shutdown;
108 sockets_rlimit(-1);
110 signal_del(&ps->ps_evsigchld);
111 signal_set(&ps->ps_evsigchld, SIGCHLD, sockets_sighdlr, ps);
112 signal_add(&ps->ps_evsigchld, NULL);
114 #ifndef PROFILE
115 if (pledge("stdio rpath wpath cpath inet recvfd proc exec sendfd",
116 NULL) == -1)
117 fatal("pledge");
118 #endif
121 void
122 sockets_parse_sockets(struct gotwebd *env)
124 struct server *srv;
125 struct address *a;
126 struct socket *new_sock = NULL;
127 int sock_id = 1;
129 TAILQ_FOREACH(srv, &env->servers, entry) {
130 if (srv->unix_socket) {
131 new_sock = sockets_conf_new_socket_unix(env, srv,
132 sock_id);
133 if (new_sock) {
134 sock_id++;
135 TAILQ_INSERT_TAIL(&env->sockets, new_sock,
136 entry);
140 if (srv->fcgi_socket) {
141 if (TAILQ_EMPTY(&srv->al)) {
142 fatalx("%s: server %s has no IP addresses to "
143 "listen for FCGI connections", __func__,
144 srv->name);
146 TAILQ_FOREACH(a, &srv->al, entry) {
147 if (a->ss.ss_family != AF_INET &&
148 a->ss.ss_family != AF_INET6)
149 continue;
150 new_sock = sockets_conf_new_socket_fcgi(env,
151 srv, sock_id, a);
152 if (new_sock) {
153 sock_id++;
154 TAILQ_INSERT_TAIL(&env->sockets,
155 new_sock, entry);
162 static struct socket *
163 sockets_conf_new_socket_unix(struct gotwebd *env, struct server *srv, int id)
165 struct socket *sock;
166 int n;
168 if ((sock = calloc(1, sizeof(*sock))) == NULL)
169 fatalx("%s: calloc", __func__);
171 sock->conf.id = id;
172 sock->fd = -1;
173 sock->conf.af_type = AF_UNIX;
175 if (strlcpy(sock->conf.unix_socket_name,
176 srv->unix_socket_name,
177 sizeof(sock->conf.unix_socket_name)) >=
178 sizeof(sock->conf.unix_socket_name)) {
179 free(sock);
180 fatalx("%s: strlcpy", __func__);
183 n = snprintf(sock->conf.name, GOTWEBD_MAXTEXT, "%s_parent",
184 srv->name);
185 if (n < 0 || (size_t)n >= GOTWEBD_MAXTEXT) {
186 free(sock);
187 fatalx("%s: snprintf", __func__);
190 if (strlcpy(sock->conf.srv_name, srv->name,
191 sizeof(sock->conf.srv_name)) >= sizeof(sock->conf.srv_name)) {
192 free(sock);
193 fatalx("%s: strlcpy", __func__);
196 return sock;
199 static struct socket *
200 sockets_conf_new_socket_fcgi(struct gotwebd *env, struct server *srv, int id,
201 struct address *a)
203 struct socket *sock;
204 struct address *acp;
205 int n;
207 if ((sock = calloc(1, sizeof(*sock))) == NULL)
208 fatalx("%s: calloc", __func__);
210 sock->conf.id = id;
211 sock->fd = -1;
212 sock->conf.af_type = a->ss.ss_family;
214 sock->conf.fcgi_socket_port = a->port;
216 n = snprintf(sock->conf.name, GOTWEBD_MAXTEXT, "%s_parent",
217 srv->name);
218 if (n < 0 || (size_t)n >= GOTWEBD_MAXTEXT) {
219 free(sock);
220 fatalx("%s: snprintf", __func__);
223 if (strlcpy(sock->conf.srv_name, srv->name,
224 sizeof(sock->conf.srv_name)) >= sizeof(sock->conf.srv_name)) {
225 free(sock);
226 fatalx("%s: strlcpy", __func__);
229 acp = &sock->conf.addr;
231 memcpy(&acp->ss, &a->ss, sizeof(acp->ss));
232 acp->ipproto = a->ipproto;
233 acp->port = a->port;
234 if (*a->ifname != '\0') {
235 if (strlcpy(acp->ifname, a->ifname,
236 sizeof(acp->ifname)) >= sizeof(acp->ifname)) {
237 fatalx("%s: interface name truncated",
238 __func__);
242 return (sock);
245 static void
246 sockets_launch(void)
248 struct socket *sock;
250 TAILQ_FOREACH(sock, &gotwebd_env->sockets, entry) {
251 log_debug("%s: configuring socket %d (%d)", __func__,
252 sock->conf.id, sock->fd);
254 event_set(&sock->ev, sock->fd, EV_READ | EV_PERSIST,
255 sockets_socket_accept, sock);
257 if (event_add(&sock->ev, NULL))
258 fatalx("event add sock");
260 evtimer_set(&sock->pause, sockets_accept_paused, sock);
262 log_debug("%s: running socket listener %d", __func__,
263 sock->conf.id);
267 static void
268 sockets_purge(struct gotwebd *env)
270 struct socket *sock, *tsock;
272 /* shutdown and remove sockets */
273 TAILQ_FOREACH_SAFE(sock, &env->sockets, entry, tsock) {
274 if (event_initialized(&sock->ev))
275 event_del(&sock->ev);
276 if (evtimer_initialized(&sock->evt))
277 evtimer_del(&sock->evt);
278 if (evtimer_initialized(&sock->pause))
279 evtimer_del(&sock->pause);
280 if (sock->fd != -1)
281 close(sock->fd);
282 TAILQ_REMOVE(&env->sockets, sock, entry);
286 static int
287 sockets_dispatch_gotwebd(int fd, struct privsep_proc *p, struct imsg *imsg)
289 struct privsep *ps = p->p_ps;
290 int res = 0, cmd = 0, verbose;
292 switch (imsg->hdr.type) {
293 case IMSG_CFG_SRV:
294 config_getserver(gotwebd_env, imsg);
295 break;
296 case IMSG_CFG_SOCK:
297 config_getsock(gotwebd_env, imsg);
298 break;
299 case IMSG_CFG_FD:
300 config_getfd(gotwebd_env, imsg);
301 break;
302 case IMSG_CFG_DONE:
303 config_getcfg(gotwebd_env, imsg);
304 break;
305 case IMSG_CTL_START:
306 sockets_launch();
307 break;
308 case IMSG_CTL_VERBOSE:
309 IMSG_SIZE_CHECK(imsg, &verbose);
310 memcpy(&verbose, imsg->data, sizeof(verbose));
311 log_setverbose(verbose);
312 break;
313 default:
314 return -1;
317 switch (cmd) {
318 case 0:
319 break;
320 default:
321 if (proc_compose_imsg(ps, PROC_GOTWEBD, -1, cmd,
322 imsg->hdr.peerid, -1, &res, sizeof(res)) == -1)
323 return -1;
324 break;
327 return 0;
330 static void
331 sockets_sighdlr(int sig, short event, void *arg)
333 switch (sig) {
334 case SIGHUP:
335 log_info("%s: ignoring SIGHUP", __func__);
336 break;
337 case SIGPIPE:
338 log_info("%s: ignoring SIGPIPE", __func__);
339 break;
340 case SIGUSR1:
341 log_info("%s: ignoring SIGUSR1", __func__);
342 break;
343 case SIGCHLD:
344 break;
345 default:
346 log_info("SIGNAL: %d", sig);
347 fatalx("unexpected signal");
351 void
352 sockets_shutdown(void)
354 struct server *srv, *tsrv;
355 struct socket *sock, *tsock;
356 int i;
358 sockets_purge(gotwebd_env);
360 /* clean sockets */
361 TAILQ_FOREACH_SAFE(sock, &gotwebd_env->sockets, entry, tsock) {
362 TAILQ_REMOVE(&gotwebd_env->sockets, sock, entry);
363 close(sock->fd);
364 free(sock);
367 /* clean servers */
368 TAILQ_FOREACH_SAFE(srv, &gotwebd_env->servers, entry, tsrv) {
369 for (i = 0; i < srv->ncached_repos; i++)
370 got_repo_close(srv->cached_repos[i].repo);
371 free(srv);
374 free(gotwebd_env);
377 int
378 sockets_privinit(struct gotwebd *env, struct socket *sock)
380 struct privsep *ps = env->gotwebd_ps;
382 if (sock->conf.af_type == AF_UNIX) {
383 log_debug("%s: initializing unix socket %s", __func__,
384 sock->conf.unix_socket_name);
385 sock->fd = sockets_unix_socket_listen(ps, sock);
386 if (sock->fd == -1) {
387 log_warnx("%s: create unix socket failed", __func__);
388 return -1;
392 if (sock->conf.af_type == AF_INET || sock->conf.af_type == AF_INET6) {
393 log_debug("%s: initializing %s FCGI socket on port %d for %s",
394 __func__, sock->conf.af_type == AF_INET ? "inet" : "inet6",
395 sock->conf.fcgi_socket_port, sock->conf.name);
396 sock->fd = sockets_create_socket(&sock->conf.addr,
397 sock->conf.fcgi_socket_port);
398 if (sock->fd == -1) {
399 log_warnx("%s: create FCGI socket failed", __func__);
400 return -1;
404 return 0;
407 static int
408 sockets_unix_socket_listen(struct privsep *ps, struct socket *sock)
410 struct gotwebd *env = ps->ps_env;
411 struct sockaddr_un sun;
412 struct socket *tsock;
413 int u_fd = -1;
414 mode_t old_umask, mode;
416 TAILQ_FOREACH(tsock, &env->sockets, entry) {
417 if (strcmp(tsock->conf.unix_socket_name,
418 sock->conf.unix_socket_name) == 0 &&
419 tsock->fd != -1)
420 return (tsock->fd);
423 /* TA: FIXME: this needs upstreaming. */
424 int socket_flags = SOCK_STREAM | SOCK_NONBLOCK;
425 #ifdef SOCK_CLOEXEC
426 socket_flags |= SOCK_CLOEXEC;
427 #endif
428 u_fd = socket(AF_UNIX, socket_flags, 0);
429 if (u_fd == -1) {
430 log_warn("%s: socket", __func__);
431 return -1;
434 sun.sun_family = AF_UNIX;
435 if (strlcpy(sun.sun_path, sock->conf.unix_socket_name,
436 sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
437 log_warn("%s: %s name too long", __func__,
438 sock->conf.unix_socket_name);
439 close(u_fd);
440 return -1;
443 if (unlink(sock->conf.unix_socket_name) == -1) {
444 if (errno != ENOENT) {
445 log_warn("%s: unlink %s", __func__,
446 sock->conf.unix_socket_name);
447 close(u_fd);
448 return -1;
452 old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
453 mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP;
455 if (bind(u_fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
456 log_warn("%s: bind: %s", __func__, sock->conf.unix_socket_name);
457 close(u_fd);
458 (void)umask(old_umask);
459 return -1;
462 (void)umask(old_umask);
464 if (chmod(sock->conf.unix_socket_name, mode) == -1) {
465 log_warn("%s: chmod", __func__);
466 close(u_fd);
467 (void)unlink(sock->conf.unix_socket_name);
468 return -1;
471 if (chown(sock->conf.unix_socket_name, ps->ps_pw->pw_uid,
472 ps->ps_pw->pw_gid) == -1) {
473 log_warn("%s: chown", __func__);
474 close(u_fd);
475 (void)unlink(sock->conf.unix_socket_name);
476 return -1;
479 if (listen(u_fd, SOCKS_BACKLOG) == -1) {
480 log_warn("%s: listen", __func__);
481 return -1;
484 return u_fd;
487 static int
488 sockets_create_socket(struct address *a, in_port_t port)
490 struct addrinfo hints;
491 int fd = -1, o_val = 1, flags;
493 memset(&hints, 0, sizeof(hints));
494 hints.ai_family = AF_UNSPEC;
495 hints.ai_socktype = SOCK_STREAM;
496 hints.ai_flags |= AI_PASSIVE;
498 switch (a->ss.ss_family) {
499 case AF_INET:
500 ((struct sockaddr_in *)(&a->ss))->sin_port = htons(port);
501 break;
502 case AF_INET6:
503 ((struct sockaddr_in6 *)(&a->ss))->sin6_port = htons(port);
504 break;
505 default:
506 log_warnx("%s: unknown address family", __func__);
507 return -1;
510 fd = socket(a->ss.ss_family, hints.ai_socktype, a->ipproto);
511 if (fd == -1)
512 return -1;
514 log_debug("%s: opened socket (%d) for %s", __func__,
515 fd, a->ifname);
517 if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &o_val,
518 sizeof(int)) == -1) {
519 log_warn("%s: setsockopt error", __func__);
520 close(fd);
521 return -1;
524 /* non-blocking */
525 flags = fcntl(fd, F_GETFL);
526 flags |= O_NONBLOCK;
527 if (fcntl(fd, F_SETFL, flags) == -1) {
528 log_info("%s: could not enable non-blocking I/O", __func__);
529 close(fd);
530 return -1;
533 if (bind(fd, (struct sockaddr *)&a->ss, SS_LEN(&a->ss)) == -1) {
534 close(fd);
535 log_info("%s: can't bind to port %d", __func__,
536 ntohs(port));
537 return -1;
540 if (listen(fd, SOMAXCONN) == -1) {
541 log_warn("%s, unable to listen on socket", __func__);
542 close(fd);
543 return -1;
546 return (fd);
549 static int
550 sockets_accept_reserve(int sockfd, struct sockaddr *addr, socklen_t *addrlen,
551 int reserve, volatile int *counter)
553 int ret;
555 if (getdtablecount() + reserve +
556 ((*counter + 1) * FD_NEEDED) >= getdtablesize()) {
557 log_debug("inflight fds exceeded");
558 errno = EMFILE;
559 return -1;
561 /* TA: This needs fixing upstream. */
562 #ifdef __APPLE__
563 ret = accept(sockfd, addr, addrlen);
564 #else
565 ret = accept4(sockfd, addr, addrlen, SOCK_NONBLOCK | SOCK_CLOEXEC);
566 #endif
568 if (ret > -1) {
569 (*counter)++;
570 log_debug("inflight incremented, now %d", *counter);
573 return ret;
576 static void
577 sockets_accept_paused(int fd, short events, void *arg)
579 struct socket *sock = (struct socket *)arg;
581 event_add(&sock->ev, NULL);
584 void
585 sockets_socket_accept(int fd, short event, void *arg)
587 struct socket *sock = (struct socket *)arg;
588 struct sockaddr_storage ss;
589 struct timeval backoff;
590 struct request *c = NULL;
591 socklen_t len;
592 int s;
594 backoff.tv_sec = 1;
595 backoff.tv_usec = 0;
597 event_add(&sock->ev, NULL);
598 if (event & EV_TIMEOUT)
599 return;
601 len = sizeof(ss);
603 s = sockets_accept_reserve(fd, (struct sockaddr *)&ss, &len,
604 FD_RESERVE, &cgi_inflight);
606 if (s == -1) {
607 switch (errno) {
608 case EINTR:
609 case EWOULDBLOCK:
610 case ECONNABORTED:
611 return;
612 case EMFILE:
613 case ENFILE:
614 event_del(&sock->ev);
615 evtimer_add(&sock->pause, &backoff);
616 return;
617 default:
618 log_warn("%s: accept", __func__);
622 if (client_cnt > GOTWEBD_MAXCLIENTS)
623 goto err;
625 c = calloc(1, sizeof(struct request));
626 if (c == NULL) {
627 log_warn("%s", __func__);
628 close(s);
629 cgi_inflight--;
630 return;
633 c->tp = template(c, fcgi_puts, fcgi_putc);
634 if (c->tp == NULL) {
635 log_warn("%s", __func__);
636 close(s);
637 cgi_inflight--;
638 free(c);
639 return;
642 c->fd = s;
643 c->sock = sock;
644 memcpy(c->priv_fd, sock->priv_fd, sizeof(c->priv_fd));
645 c->buf_pos = 0;
646 c->buf_len = 0;
647 c->request_started = 0;
648 c->sock->client_status = CLIENT_CONNECT;
650 event_set(&c->ev, s, EV_READ|EV_PERSIST, fcgi_request, c);
651 event_add(&c->ev, NULL);
653 evtimer_set(&c->tmo, fcgi_timeout, c);
654 evtimer_add(&c->tmo, &timeout);
656 client_cnt++;
658 return;
659 err:
660 cgi_inflight--;
661 close(s);
662 if (c != NULL)
663 free(c);
666 static void
667 sockets_rlimit(int maxfd)
669 struct rlimit rl;
671 if (getrlimit(RLIMIT_NOFILE, &rl) == -1)
672 fatal("%s: failed to get resource limit", __func__);
673 log_debug("%s: max open files %llu", __func__,
674 (unsigned long long)rl.rlim_max);
676 /*
677 * Allow the maximum number of open file descriptors for this
678 * login class (which should be the class "daemon" by default).
679 */
680 if (maxfd == -1)
681 rl.rlim_cur = rl.rlim_max;
682 else
683 rl.rlim_cur = MAXIMUM(rl.rlim_max, (rlim_t)maxfd);
684 if (setrlimit(RLIMIT_NOFILE, &rl) == -1)
685 fatal("%s: failed to set resource limit", __func__);