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>
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.
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.
20 #include <sys/param.h>
21 #include <sys/ioctl.h>
22 #include <sys/queue.h>
25 #include <sys/resource.h>
26 #include <sys/socket.h>
29 #include <sys/types.h>
34 #include <netinet/in.h>
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"
61 #define SOCKS_BACKLOG 5
62 #define MAXIMUM(a, b) (((a) > (b)) ? (a) : (b))
64 volatile int client_cnt;
66 static struct timeval timeout = { TIMEOUT_DEFAULT, 0 };
68 static void sockets_sighdlr(int, short, void *);
69 static void sockets_shutdown(void);
70 static void sockets_launch(void);
71 static void sockets_purge(struct gotwebd *);
72 static void sockets_accept_paused(int, short, void *);
73 static void sockets_rlimit(int);
75 static void sockets_dispatch_main(int, short, void *);
76 static int sockets_unix_socket_listen(struct gotwebd *, struct socket *);
77 static int sockets_create_socket(struct address *);
78 static int sockets_accept_reserve(int, struct sockaddr *, socklen_t *,
81 static struct socket *sockets_conf_new_socket_unix(struct gotwebd *,
82 struct server *, int);
83 static struct socket *sockets_conf_new_socket_fcgi(struct gotwebd *,
84 struct server *, int, struct address *);
89 sockets(struct gotwebd *env, int fd)
91 struct event sighup, sigusr1, sigchld;
97 if (config_init(env) == -1)
98 fatal("failed to initialize configuration");
100 if ((env->iev_parent = malloc(sizeof(*env->iev_parent))) == NULL)
102 imsg_init(&env->iev_parent->ibuf, fd);
103 env->iev_parent->handler = sockets_dispatch_main;
104 env->iev_parent->data = env->iev_parent;
105 event_set(&env->iev_parent->ev, fd, EV_READ, sockets_dispatch_main,
107 event_add(&env->iev_parent->ev, NULL);
109 signal(SIGPIPE, SIG_IGN);
111 signal_set(&sighup, SIGHUP, sockets_sighdlr, env);
112 signal_add(&sighup, NULL);
113 signal_set(&sigusr1, SIGUSR1, sockets_sighdlr, env);
114 signal_add(&sigusr1, NULL);
115 signal_set(&sigchld, SIGCHLD, sockets_sighdlr, env);
116 signal_add(&sigchld, NULL);
119 if (pledge("stdio rpath inet recvfd proc exec sendfd unveil",
129 sockets_parse_sockets(struct gotwebd *env)
133 struct socket *new_sock = NULL;
136 TAILQ_FOREACH(srv, &env->servers, entry) {
137 if (srv->unix_socket) {
138 new_sock = sockets_conf_new_socket_unix(env, srv,
142 TAILQ_INSERT_TAIL(&env->sockets, new_sock,
147 if (srv->fcgi_socket) {
148 if (TAILQ_EMPTY(&srv->al)) {
149 fatalx("%s: server %s has no IP addresses to "
150 "listen for FCGI connections", __func__,
153 TAILQ_FOREACH(a, &srv->al, entry) {
154 if (a->ss.ss_family != AF_INET &&
155 a->ss.ss_family != AF_INET6)
157 new_sock = sockets_conf_new_socket_fcgi(env,
161 TAILQ_INSERT_TAIL(&env->sockets,
169 static struct socket *
170 sockets_conf_new_socket_unix(struct gotwebd *env, struct server *srv, int id)
175 if ((sock = calloc(1, sizeof(*sock))) == NULL)
176 fatalx("%s: calloc", __func__);
180 sock->conf.af_type = AF_UNIX;
182 if (strlcpy(sock->conf.unix_socket_name,
183 srv->unix_socket_name,
184 sizeof(sock->conf.unix_socket_name)) >=
185 sizeof(sock->conf.unix_socket_name)) {
187 fatalx("%s: strlcpy", __func__);
190 n = snprintf(sock->conf.name, GOTWEBD_MAXTEXT, "%s_parent",
192 if (n < 0 || (size_t)n >= GOTWEBD_MAXTEXT) {
194 fatalx("%s: snprintf", __func__);
197 if (strlcpy(sock->conf.srv_name, srv->name,
198 sizeof(sock->conf.srv_name)) >= sizeof(sock->conf.srv_name)) {
200 fatalx("%s: strlcpy", __func__);
206 static struct socket *
207 sockets_conf_new_socket_fcgi(struct gotwebd *env, struct server *srv, int id,
214 if ((sock = calloc(1, sizeof(*sock))) == NULL)
215 fatalx("%s: calloc", __func__);
219 sock->conf.af_type = a->ss.ss_family;
221 sock->conf.fcgi_socket_port = a->port;
223 n = snprintf(sock->conf.name, GOTWEBD_MAXTEXT, "%s_parent",
225 if (n < 0 || (size_t)n >= GOTWEBD_MAXTEXT) {
227 fatalx("%s: snprintf", __func__);
230 if (strlcpy(sock->conf.srv_name, srv->name,
231 sizeof(sock->conf.srv_name)) >= sizeof(sock->conf.srv_name)) {
233 fatalx("%s: strlcpy", __func__);
236 acp = &sock->conf.addr;
238 memcpy(&acp->ss, &a->ss, sizeof(acp->ss));
240 acp->ai_family = a->ai_family;
241 acp->ai_socktype = a->ai_socktype;
242 acp->ai_protocol = a->ai_protocol;
244 if (*a->ifname != '\0') {
245 if (strlcpy(acp->ifname, a->ifname,
246 sizeof(acp->ifname)) >= sizeof(acp->ifname)) {
247 fatalx("%s: interface name truncated",
260 const struct got_error *error;
262 TAILQ_FOREACH(sock, &gotwebd_env->sockets, entry) {
263 log_debug("%s: configuring socket %d (%d)", __func__,
264 sock->conf.id, sock->fd);
266 event_set(&sock->ev, sock->fd, EV_READ | EV_PERSIST,
267 sockets_socket_accept, sock);
269 if (event_add(&sock->ev, NULL))
270 fatalx("event add sock");
272 evtimer_set(&sock->pause, sockets_accept_paused, sock);
274 log_debug("%s: running socket listener %d", __func__,
278 TAILQ_FOREACH(srv, &gotwebd_env->servers, entry) {
279 if (unveil(srv->repos_path, "r") == -1)
280 fatal("unveil %s", srv->repos_path);
283 error = got_privsep_unveil_exec_helpers();
285 fatal("%s", error->msg);
287 if (unveil(NULL, NULL) == -1)
292 sockets_purge(struct gotwebd *env)
294 struct socket *sock, *tsock;
296 /* shutdown and remove sockets */
297 TAILQ_FOREACH_SAFE(sock, &env->sockets, entry, tsock) {
298 if (event_initialized(&sock->ev))
299 event_del(&sock->ev);
300 if (evtimer_initialized(&sock->evt))
301 evtimer_del(&sock->evt);
302 if (evtimer_initialized(&sock->pause))
303 evtimer_del(&sock->pause);
306 TAILQ_REMOVE(&env->sockets, sock, entry);
311 sockets_dispatch_main(int fd, short event, void *arg)
313 struct imsgev *iev = arg;
314 struct imsgbuf *ibuf;
316 struct gotwebd *env = gotwebd_env;
322 if (event & EV_READ) {
323 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
324 fatal("imsg_read error");
325 if (n == 0) /* Connection closed */
328 if (event & EV_WRITE) {
329 if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN)
330 fatal("msgbuf_write");
331 if (n == 0) /* Connection closed */
336 if ((n = imsg_get(ibuf, &imsg)) == -1)
338 if (n == 0) /* No more messages. */
341 switch (imsg.hdr.type) {
343 config_getserver(env, &imsg);
346 config_getsock(env, &imsg);
349 config_getfd(env, &imsg);
352 config_getcfg(env, &imsg);
358 fatalx("%s: unknown imsg type %d", __func__,
368 /* This pipe is dead. Remove its event handler */
370 event_loopexit(NULL);
375 sockets_sighdlr(int sig, short event, void *arg)
379 log_info("%s: ignoring SIGHUP", __func__);
382 log_info("%s: ignoring SIGPIPE", __func__);
385 log_info("%s: ignoring SIGUSR1", __func__);
390 log_info("SIGNAL: %d", sig);
391 fatalx("unexpected signal");
396 sockets_shutdown(void)
398 struct server *srv, *tsrv;
399 struct socket *sock, *tsock;
401 sockets_purge(gotwebd_env);
404 TAILQ_FOREACH_SAFE(sock, &gotwebd_env->sockets, entry, tsock) {
405 TAILQ_REMOVE(&gotwebd_env->sockets, sock, entry);
411 TAILQ_FOREACH_SAFE(srv, &gotwebd_env->servers, entry, tsrv)
418 sockets_privinit(struct gotwebd *env, struct socket *sock)
420 if (sock->conf.af_type == AF_UNIX) {
421 log_debug("%s: initializing unix socket %s", __func__,
422 sock->conf.unix_socket_name);
423 sock->fd = sockets_unix_socket_listen(env, sock);
424 if (sock->fd == -1) {
425 log_warnx("%s: create unix socket failed", __func__);
430 if (sock->conf.af_type == AF_INET || sock->conf.af_type == AF_INET6) {
431 log_debug("%s: initializing %s FCGI socket on port %d for %s",
432 __func__, sock->conf.af_type == AF_INET ? "inet" : "inet6",
433 sock->conf.fcgi_socket_port, sock->conf.name);
434 sock->fd = sockets_create_socket(&sock->conf.addr);
435 if (sock->fd == -1) {
436 log_warnx("%s: create FCGI socket failed", __func__);
445 sockets_unix_socket_listen(struct gotwebd *env, struct socket *sock)
447 struct sockaddr_un sun;
448 struct socket *tsock;
450 mode_t old_umask, mode;
452 TAILQ_FOREACH(tsock, &env->sockets, entry) {
453 if (strcmp(tsock->conf.unix_socket_name,
454 sock->conf.unix_socket_name) == 0 &&
459 u_fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK| SOCK_CLOEXEC, 0);
461 log_warn("%s: socket", __func__);
465 sun.sun_family = AF_UNIX;
466 if (strlcpy(sun.sun_path, sock->conf.unix_socket_name,
467 sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
468 log_warn("%s: %s name too long", __func__,
469 sock->conf.unix_socket_name);
474 if (unlink(sock->conf.unix_socket_name) == -1) {
475 if (errno != ENOENT) {
476 log_warn("%s: unlink %s", __func__,
477 sock->conf.unix_socket_name);
483 old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
484 mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP;
486 if (bind(u_fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
487 log_warn("%s: bind: %s", __func__, sock->conf.unix_socket_name);
489 (void)umask(old_umask);
493 (void)umask(old_umask);
495 if (chmod(sock->conf.unix_socket_name, mode) == -1) {
496 log_warn("%s: chmod", __func__);
498 (void)unlink(sock->conf.unix_socket_name);
502 if (chown(sock->conf.unix_socket_name, env->pw->pw_uid,
503 env->pw->pw_gid) == -1) {
504 log_warn("%s: chown", __func__);
506 (void)unlink(sock->conf.unix_socket_name);
510 if (listen(u_fd, SOCKS_BACKLOG) == -1) {
511 log_warn("%s: listen", __func__);
519 sockets_create_socket(struct address *a)
521 int fd = -1, o_val = 1, flags;
523 fd = socket(a->ai_family, a->ai_socktype, a->ai_protocol);
527 log_debug("%s: opened socket (%d) for %s", __func__,
530 if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &o_val,
531 sizeof(int)) == -1) {
532 log_warn("%s: setsockopt error", __func__);
538 flags = fcntl(fd, F_GETFL);
540 if (fcntl(fd, F_SETFL, flags) == -1) {
541 log_info("%s: could not enable non-blocking I/O", __func__);
546 if (bind(fd, (struct sockaddr *)&a->ss, a->slen) == -1) {
548 log_info("%s: can't bind to port %d", __func__, a->port);
552 if (listen(fd, SOMAXCONN) == -1) {
553 log_warn("%s, unable to listen on socket", __func__);
562 sockets_accept_reserve(int sockfd, struct sockaddr *addr, socklen_t *addrlen,
563 int reserve, volatile int *counter)
567 if (getdtablecount() + reserve +
568 ((*counter + 1) * FD_NEEDED) >= getdtablesize()) {
569 log_debug("inflight fds exceeded");
574 if ((ret = accept4(sockfd, addr, addrlen,
575 SOCK_NONBLOCK | SOCK_CLOEXEC)) > -1) {
577 log_debug("inflight incremented, now %d", *counter);
584 sockets_accept_paused(int fd, short events, void *arg)
586 struct socket *sock = (struct socket *)arg;
588 event_add(&sock->ev, NULL);
592 sockets_socket_accept(int fd, short event, void *arg)
594 struct socket *sock = (struct socket *)arg;
595 struct sockaddr_storage ss;
596 struct timeval backoff;
597 struct request *c = NULL;
604 event_add(&sock->ev, NULL);
605 if (event & EV_TIMEOUT)
610 s = sockets_accept_reserve(fd, (struct sockaddr *)&ss, &len,
611 FD_RESERVE, &cgi_inflight);
621 event_del(&sock->ev);
622 evtimer_add(&sock->pause, &backoff);
625 log_warn("%s: accept", __func__);
629 if (client_cnt > GOTWEBD_MAXCLIENTS)
632 c = calloc(1, sizeof(struct request));
634 log_warn("%s", __func__);
640 c->tp = template(c, &fcgi_write, c->outbuf, sizeof(c->outbuf));
642 log_warn("%s", __func__);
651 memcpy(c->priv_fd, sock->priv_fd, sizeof(c->priv_fd));
654 c->request_started = 0;
655 c->sock->client_status = CLIENT_CONNECT;
657 event_set(&c->ev, s, EV_READ|EV_PERSIST, fcgi_request, c);
658 event_add(&c->ev, NULL);
660 evtimer_set(&c->tmo, fcgi_timeout, c);
661 evtimer_add(&c->tmo, &timeout);
674 sockets_rlimit(int maxfd)
678 if (getrlimit(RLIMIT_NOFILE, &rl) == -1)
679 fatal("%s: failed to get resource limit", __func__);
680 log_debug("%s: max open files %llu", __func__,
681 (unsigned long long)rl.rlim_max);
684 * Allow the maximum number of open file descriptors for this
685 * login class (which should be the class "daemon" by default).
688 rl.rlim_cur = rl.rlim_max;
690 rl.rlim_cur = MAXIMUM(rl.rlim_max, (rlim_t)maxfd);
691 if (setrlimit(RLIMIT_NOFILE, &rl) == -1)
692 fatal("%s: failed to set resource limit", __func__);