Blob


1 /*
2 * Copyright (c) 2020 Omar Polo <op@omarpolo.com>
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 */
17 #include "gmid.h"
19 #include <sys/stat.h>
21 #include <errno.h>
22 #include <fcntl.h>
23 #include <getopt.h>
24 #include <libgen.h>
25 #include <limits.h>
26 #include <pwd.h>
27 #include <signal.h>
28 #include <string.h>
30 static const char *opts = "6c:D:d:fH:hnP:p:Vvx:";
32 static struct option longopts[] = {
33 {"help", no_argument, NULL, 'h'},
34 {"version", no_argument, NULL, 'V'},
35 {NULL, 0, NULL, 0},
36 };
38 struct fcgi fcgi[FCGI_MAX];
40 struct vhosthead hosts;
42 int sock4, sock6;
44 struct imsgbuf logibuf, exibuf, servibuf[PROC_MAX];
46 const char *config_path, *certs_dir, *hostname, *pidfile, *cgi;
48 struct conf conf;
50 struct tls_config *tlsconf;
51 struct tls *ctx;
53 static void
54 dummy_handler(int signo)
55 {
56 return;
57 }
59 /* wrapper around dirname(3). dn must be PATH_MAX+1 at least. */
60 static void
61 pdirname(const char *path, char *dn)
62 {
63 char p[PATH_MAX+1];
64 char *t;
66 strlcpy(p, path, sizeof(p));
67 t = dirname(p);
68 memmove(dn, t, strlen(t)+1);
69 }
71 static void
72 mkdirs(const char *path, mode_t mode)
73 {
74 char dname[PATH_MAX+1];
76 pdirname(path, dname);
77 if (!strcmp(dname, "/"))
78 return;
79 mkdirs(dname, mode);
80 if (mkdir(path, mode) != 0 && errno != EEXIST)
81 fatal("can't mkdir %s: %s", path, strerror(errno));
82 }
84 /* $XDG_DATA_HOME/gmid */
85 char *
86 data_dir(void)
87 {
88 const char *home, *xdg;
89 char *t;
91 if ((xdg = getenv("XDG_DATA_HOME")) == NULL) {
92 if ((home = getenv("HOME")) == NULL)
93 errx(1, "XDG_DATA_HOME and HOME both empty");
94 if (asprintf(&t, "%s/.local/share/gmid", home) == -1)
95 err(1, "asprintf");
96 } else {
97 if (asprintf(&t, "%s/gmid", xdg) == -1)
98 err(1, "asprintf");
99 }
101 mkdirs(t, 0755);
102 return t;
105 void
106 load_local_cert(const char *hostname, const char *dir)
108 char *cert, *key;
109 struct vhost *h;
111 if (asprintf(&cert, "%s/%s.cert.pem", dir, hostname) == -1)
112 errx(1, "asprintf");
113 if (asprintf(&key, "%s/%s.key.pem", dir, hostname) == -1)
114 errx(1, "asprintf");
116 if (access(cert, R_OK) == -1 || access(key, R_OK) == -1)
117 gen_certificate(hostname, cert, key);
119 h = TAILQ_FIRST(&hosts);
120 h->cert = cert;
121 h->key = key;
122 h->domain = hostname;
125 void
126 load_vhosts(void)
128 struct vhost *h;
129 struct location *l;
131 TAILQ_FOREACH(h, &hosts, vhosts) {
132 TAILQ_FOREACH(l, &h->locations, locations) {
133 if (l->dir == NULL)
134 continue;
135 if ((l->dirfd = open(l->dir, O_RDONLY | O_DIRECTORY)) == -1)
136 fatal("open %s for domain %s: %s", l->dir, h->domain,
137 strerror(errno));
142 int
143 make_socket(int port, int family)
145 int sock, v;
146 struct sockaddr_in addr4;
147 struct sockaddr_in6 addr6;
148 struct sockaddr *addr;
149 socklen_t len;
151 switch (family) {
152 case AF_INET:
153 memset(&addr4, 0, sizeof(addr4));
154 addr4.sin_family = family;
155 addr4.sin_port = htons(port);
156 addr4.sin_addr.s_addr = INADDR_ANY;
157 addr = (struct sockaddr*)&addr4;
158 len = sizeof(addr4);
159 break;
161 case AF_INET6:
162 memset(&addr6, 0, sizeof(addr6));
163 addr6.sin6_family = AF_INET6;
164 addr6.sin6_port = htons(port);
165 addr6.sin6_addr = in6addr_any;
166 addr = (struct sockaddr*)&addr6;
167 len = sizeof(addr6);
168 break;
170 default:
171 /* unreachable */
172 abort();
175 if ((sock = socket(family, SOCK_STREAM, 0)) == -1)
176 fatal("socket: %s", strerror(errno));
178 v = 1;
179 if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) == -1)
180 fatal("setsockopt(SO_REUSEADDR): %s", strerror(errno));
182 v = 1;
183 if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(v)) == -1)
184 fatal("setsockopt(SO_REUSEPORT): %s", strerror(errno));
186 mark_nonblock(sock);
188 if (bind(sock, addr, len) == -1)
189 fatal("bind: %s", strerror(errno));
191 if (listen(sock, 16) == -1)
192 fatal("listen: %s", strerror(errno));
194 return sock;
197 static void
198 add_keypair(struct vhost *h)
200 if (h->ocsp == NULL) {
201 if (tls_config_add_keypair_file(tlsconf, h->cert, h->key) == -1)
202 fatal("failed to load the keypair (%s, %s)",
203 h->cert, h->key);
204 } else {
205 if (tls_config_add_keypair_ocsp_file(tlsconf, h->cert, h->key,
206 h->ocsp) == -1)
207 fatal("failed to load the keypair (%s, %s, %s)",
208 h->cert, h->key, h->ocsp);
212 void
213 setup_tls(void)
215 struct vhost *h;
217 if ((tlsconf = tls_config_new()) == NULL)
218 fatal("tls_config_new");
220 /* optionally accept client certs, but don't try to verify them */
221 tls_config_verify_client_optional(tlsconf);
222 tls_config_insecure_noverifycert(tlsconf);
224 if (tls_config_set_protocols(tlsconf, conf.protos) == -1)
225 fatal("tls_config_set_protocols");
227 if ((ctx = tls_server()) == NULL)
228 fatal("tls_server failure");
230 h = TAILQ_FIRST(&hosts);
232 /* we need to set something, then we can add how many key we want */
233 if (tls_config_set_keypair_file(tlsconf, h->cert, h->key))
234 fatal("tls_config_set_keypair_file failed for (%s, %s)",
235 h->cert, h->key);
237 /* same for OCSP */
238 if (h->ocsp != NULL &&
239 tls_config_set_ocsp_staple_file(tlsconf, h->ocsp) == -1)
240 fatal("tls_config_set_ocsp_staple_file failed for (%s)",
241 h->ocsp);
243 while ((h = TAILQ_NEXT(h, vhosts)) != NULL)
244 add_keypair(h);
246 if (tls_configure(ctx, tlsconf) == -1)
247 fatal("tls_configure: %s", tls_error(ctx));
250 static int
251 listener_main(struct imsgbuf *ibuf)
253 drop_priv();
254 load_default_mime(&conf.mime);
255 load_vhosts();
256 loop(ctx, sock4, sock6, ibuf);
257 return 0;
260 void
261 init_config(void)
263 TAILQ_INIT(&hosts);
265 conf.port = 1965;
266 conf.ipv6 = 0;
267 conf.protos = TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3;
269 init_mime(&conf.mime);
271 conf.chroot = NULL;
272 conf.user = NULL;
274 conf.prefork = 3;
277 void
278 free_config(void)
280 struct vhost *h, *th;
281 struct location *l, *tl;
282 struct proxy *p, *tp;
283 struct envlist *e, *te;
284 struct alist *a, *ta;
285 int v, i;
287 v = conf.verbose;
289 free(conf.chroot);
290 free(conf.user);
291 memset(&conf, 0, sizeof(conf));
293 conf.verbose = v;
295 TAILQ_FOREACH_SAFE(h, &hosts, vhosts, th) {
296 TAILQ_FOREACH_SAFE(l, &h->locations, locations, tl) {
297 TAILQ_REMOVE(&h->locations, l, locations);
299 free((char*)l->match);
300 free((char*)l->lang);
301 free((char*)l->default_mime);
302 free((char*)l->index);
303 free((char*)l->block_fmt);
304 free((char*)l->dir);
306 if (l->dirfd != -1)
307 close(l->dirfd);
309 free(l);
312 TAILQ_FOREACH_SAFE(e, &h->env, envs, te) {
313 TAILQ_REMOVE(&h->env, e, envs);
315 free(e->name);
316 free(e->value);
317 free(e);
320 TAILQ_FOREACH_SAFE(e, &h->params, envs, te) {
321 TAILQ_REMOVE(&h->params, e, envs);
323 free(e->name);
324 free(e->value);
325 free(e);
328 TAILQ_FOREACH_SAFE(a, &h->aliases, aliases, ta) {
329 TAILQ_REMOVE(&h->aliases, a, aliases);
331 free(a->alias);
332 free(a);
335 TAILQ_FOREACH_SAFE(p, &h->proxies, proxies, tp) {
336 TAILQ_REMOVE(&h->proxies, p, proxies);
338 free(p->match_proto);
339 free(p->match_host);
340 free(p->host);
341 free(p->sni);
342 tls_unload_file(p->cert, p->certlen);
343 tls_unload_file(p->key, p->keylen);
344 free(p);
347 free((char*)h->domain);
348 free((char*)h->cert);
349 free((char*)h->key);
350 free((char*)h->ocsp);
351 free((char*)h->cgi);
352 free((char*)h->entrypoint);
354 TAILQ_REMOVE(&hosts, h, vhosts);
355 free(h);
358 for (i = 0; i < FCGI_MAX; ++i) {
359 if (fcgi[i].path == NULL && fcgi[i].prog == NULL)
360 break;
361 free(fcgi[i].path);
362 free(fcgi[i].port);
363 free(fcgi[i].prog);
365 fcgi[i].path = NULL;
366 fcgi[i].port = NULL;
367 fcgi[i].prog = NULL;
370 tls_free(ctx);
371 tls_config_free(tlsconf);
374 static int
375 wait_signal(void)
377 sigset_t mask;
378 int signo;
380 sigemptyset(&mask);
381 sigaddset(&mask, SIGHUP);
382 sigaddset(&mask, SIGINT);
383 sigaddset(&mask, SIGTERM);
384 sigwait(&mask, &signo);
386 return signo == SIGHUP;
389 void
390 drop_priv(void)
392 struct passwd *pw = NULL;
394 if (conf.chroot != NULL && conf.user == NULL)
395 fatal("can't chroot without an user to switch to after.");
397 if (conf.user != NULL) {
398 if ((pw = getpwnam(conf.user)) == NULL)
399 fatal("can't find user %s", conf.user);
402 if (conf.chroot != NULL) {
403 if (chroot(conf.chroot) != 0 || chdir("/") != 0)
404 fatal("%s: %s", conf.chroot, strerror(errno));
407 if (pw != NULL) {
408 if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1)
409 fatal("setresuid(%d): %s", pw->pw_uid,
410 strerror(errno));
413 if (getuid() == 0)
414 log_warn(NULL, "not a good idea to run a network daemon as root");
417 static void
418 usage(void)
420 fprintf(stderr,
421 "Version: " GMID_STRING "\n"
422 "Usage: %s [-fnv] [-c config] [-D macro=value] [-P pidfile]\n"
423 " %s [-6hVv] [-d certs-dir] [-H hostname] [-p port] [-x cgi] [dir]\n",
424 getprogname(),
425 getprogname());
428 static void
429 logger_init(void)
431 int p[2];
433 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, p) == -1)
434 err(1, "socketpair");
436 switch (fork()) {
437 case -1:
438 err(1, "fork");
439 case 0:
440 signal(SIGHUP, SIG_IGN);
441 close(p[0]);
442 setproctitle("logger");
443 imsg_init(&logibuf, p[1]);
444 drop_priv();
445 _exit(logger_main(p[1], &logibuf));
446 default:
447 close(p[1]);
448 imsg_init(&logibuf, p[0]);
449 return;
453 static int
454 serve(int argc, char **argv, struct imsgbuf *ibuf)
456 char path[PATH_MAX];
457 int i, p[2];
458 struct vhost *h;
459 struct location *l;
461 if (config_path == NULL) {
462 if (hostname == NULL)
463 hostname = "localhost";
464 if (certs_dir == NULL)
465 certs_dir = data_dir();
466 load_local_cert(hostname, certs_dir);
468 h = TAILQ_FIRST(&hosts);
469 h->domain = "*";
471 l = TAILQ_FIRST(&h->locations);
472 l->auto_index = 1;
473 l->match = "*";
475 switch (argc) {
476 case 0:
477 l->dir = getcwd(path, sizeof(path));
478 break;
479 case 1:
480 l->dir = absolutify_path(argv[0]);
481 break;
482 default:
483 usage();
484 return 1;
487 log_notice(NULL, "serving %s on port %d", l->dir, conf.port);
490 /* setup tls before dropping privileges: we don't want user
491 * to put private certs inside the chroot. */
492 setup_tls();
494 for (i = 0; i < conf.prefork; ++i) {
495 if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC,
496 PF_UNSPEC, p) == -1)
497 fatal("socketpair: %s", strerror(errno));
499 switch (fork()) {
500 case -1:
501 fatal("fork: %s", strerror(errno));
502 case 0: /* child */
503 close(p[0]);
504 imsg_init(&exibuf, p[1]);
505 setproctitle("server");
506 _exit(listener_main(&exibuf));
507 default:
508 close(p[1]);
509 imsg_init(&servibuf[i], p[0]);
513 setproctitle("executor");
514 drop_priv();
515 _exit(executor_main(ibuf));
518 static int
519 write_pidfile(const char *pidfile)
521 struct flock lock;
522 int fd;
524 if (pidfile == NULL)
525 return -1;
527 if ((fd = open(pidfile, O_WRONLY|O_CREAT|O_CLOEXEC, 0600)) == -1)
528 fatal("can't open pidfile %s: %s", pidfile, strerror(errno));
530 lock.l_start = 0;
531 lock.l_len = 0;
532 lock.l_type = F_WRLCK;
533 lock.l_whence = SEEK_SET;
535 if (fcntl(fd, F_SETLK, &lock) == -1)
536 fatal("can't lock %s, gmid is already running?", pidfile);
538 if (ftruncate(fd, 0) == -1)
539 fatal("ftruncate: %s: %s", pidfile, strerror(errno));
541 dprintf(fd, "%d\n", getpid());
543 return fd;
546 static void
547 setup_configless(int argc, char **argv, const char *cgi)
549 struct vhost *host;
550 struct location *loc;
552 host = xcalloc(1, sizeof(*host));
553 host->cgi = cgi;
554 TAILQ_INSERT_HEAD(&hosts, host, vhosts);
556 loc = xcalloc(1, sizeof(*loc));
557 loc->fcgi = -1;
558 TAILQ_INSERT_HEAD(&host->locations, loc, locations);
560 serve(argc, argv, NULL);
562 imsg_compose(&logibuf, IMSG_QUIT, 0, 0, -1, NULL, 0);
563 imsg_flush(&logibuf);
566 static int
567 parse_portno(const char *p)
569 const char *errstr;
570 int n;
572 n = strtonum(p, 0, UINT16_MAX, &errstr);
573 if (errstr != NULL)
574 yyerror("port number is %s: %s", errstr, p);
575 return n;
578 int
579 main(int argc, char **argv)
581 struct imsgbuf exibuf;
582 int ch, conftest = 0, configless = 0;
583 int pidfd, old_ipv6, old_port;
585 logger_init();
586 init_config();
588 while ((ch = getopt_long(argc, argv, opts, longopts, NULL)) != -1) {
589 switch (ch) {
590 case '6':
591 conf.ipv6 = 1;
592 configless = 1;
593 break;
595 case 'c':
596 config_path = absolutify_path(optarg);
597 break;
599 case 'D':
600 if (cmdline_symset(optarg) == -1)
601 fatal("could not parse macro definition: %s",
602 optarg);
603 break;
605 case 'd':
606 certs_dir = optarg;
607 configless = 1;
608 break;
610 case 'f':
611 conf.foreground = 1;
612 break;
614 case 'H':
615 hostname = optarg;
616 configless = 1;
617 break;
619 case 'h':
620 usage();
621 return 0;
623 case 'n':
624 conftest++;
625 break;
627 case 'P':
628 pidfile = optarg;
629 break;
631 case 'p':
632 conf.port = parse_portno(optarg);
633 configless = 1;
634 break;
636 case 'V':
637 puts("Version: " GMID_STRING);
638 return 0;
640 case 'v':
641 conf.verbose++;
642 break;
644 case 'x':
645 /* drop the starting / (if any) */
646 if (*optarg == '/')
647 optarg++;
648 cgi = optarg;
649 configless = 1;
650 break;
652 default:
653 usage();
654 return 1;
657 argc -= optind;
658 argv += optind;
660 if (config_path == NULL) {
661 configless = 1;
662 conf.foreground = 1;
663 conf.prefork = 1;
664 conf.verbose++;
667 if (config_path != NULL && (argc > 0 || configless))
668 fatal("can't specify options in config mode.");
670 if (conftest) {
671 if (config_path == NULL)
672 fatal("missing configuration");
673 parse_conf(config_path);
674 fprintf(stderr, "config OK\n");
675 if (conftest > 1)
676 print_conf();
677 return 0;
680 if (!conf.foreground && !configless) {
681 /* log to syslog */
682 imsg_compose(&logibuf, IMSG_LOG_TYPE, 0, 0, -1, NULL, 0);
683 imsg_flush(&logibuf);
685 if (daemon(1, 1) == -1)
686 fatal("daemon: %s", strerror(errno));
689 if (config_path != NULL)
690 parse_conf(config_path);
692 sock4 = make_socket(conf.port, AF_INET);
693 sock6 = -1;
694 if (conf.ipv6)
695 sock6 = make_socket(conf.port, AF_INET6);
697 signal(SIGPIPE, SIG_IGN);
698 signal(SIGCHLD, SIG_IGN);
700 if (configless) {
701 setup_configless(argc, argv, cgi);
702 return 0;
705 pidfd = write_pidfile(pidfile);
707 /*
708 * Linux seems to call the event handlers even when we're
709 * doing a sigwait. These dummy handlers are here to avoid
710 * being terminated on SIGHUP, SIGINT or SIGTERM.
711 */
712 signal(SIGHUP, dummy_handler);
713 signal(SIGINT, dummy_handler);
714 signal(SIGTERM, dummy_handler);
716 /* wait a sighup and reload the daemon */
717 for (;;) {
718 int p[2];
720 if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC,
721 PF_UNSPEC, p) == -1)
722 fatal("socketpair: %s", strerror(errno));
724 switch (fork()) {
725 case -1:
726 fatal("fork: %s", strerror(errno));
727 case 0:
728 close(p[0]);
729 imsg_init(&exibuf, p[1]);
730 _exit(serve(argc, argv, &exibuf));
733 close(p[1]);
734 imsg_init(&exibuf, p[0]);
736 if (!wait_signal())
737 break;
739 log_info(NULL, "reloading configuration %s", config_path);
741 /* close the executor (it'll close the servers too) */
742 imsg_compose(&exibuf, IMSG_QUIT, 0, 0, -1, NULL, 0);
743 imsg_flush(&exibuf);
744 close(p[0]);
746 old_ipv6 = conf.ipv6;
747 old_port = conf.port;
749 free_config();
750 init_config();
751 parse_conf(config_path);
753 if (old_port != conf.port) {
754 close(sock4);
755 close(sock6);
756 sock4 = -1;
757 sock6 = -1;
760 if (sock6 != -1 && old_ipv6 != conf.ipv6) {
761 close(sock6);
762 sock6 = -1;
765 if (sock4 == -1)
766 sock4 = make_socket(conf.port, AF_INET);
767 if (sock6 == -1 && conf.ipv6)
768 sock6 = make_socket(conf.port, AF_INET6);
771 imsg_compose(&exibuf, IMSG_QUIT, 0, 0, -1, NULL, 0);
772 imsg_flush(&exibuf);
774 imsg_compose(&logibuf, IMSG_QUIT, 0, 0, -1, NULL, 0);
775 imsg_flush(&logibuf);
777 if (pidfd != -1)
778 close(pidfd);
780 return 0;