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 <libgen.h>
24 #include <limits.h>
25 #include <pwd.h>
26 #include <signal.h>
27 #include <string.h>
29 struct vhosthead hosts;
31 int sock4, sock6;
33 struct imsgbuf logibuf, exibuf, servibuf[PROC_MAX];
35 const char *config_path, *certs_dir, *hostname;
37 struct conf conf;
39 struct tls_config *tlsconf;
40 struct tls *ctx;
42 static void
43 dummy_handler(int signo)
44 {
45 return;
46 }
48 /* wrapper around dirname(3). dn must be PATH_MAX+1 at least. */
49 static void
50 pdirname(const char *path, char *dn)
51 {
52 char p[PATH_MAX+1];
53 char *t;
55 strlcpy(p, path, sizeof(p));
56 t = dirname(p);
57 memmove(dn, t, strlen(t)+1);
58 }
60 static void
61 mkdirs(const char *path, mode_t mode)
62 {
63 char dname[PATH_MAX+1];
65 pdirname(path, dname);
66 if (!strcmp(dname, "/"))
67 return;
68 mkdirs(dname, mode);
69 if (mkdir(path, mode) != 0 && errno != EEXIST)
70 fatal("can't mkdir %s: %s", path, strerror(errno));
71 }
73 /* $XDG_DATA_HOME/gmid */
74 char *
75 data_dir(void)
76 {
77 const char *home, *xdg;
78 char *t;
80 if ((xdg = getenv("XDG_DATA_HOME")) == NULL) {
81 if ((home = getenv("HOME")) == NULL)
82 errx(1, "XDG_DATA_HOME and HOME both empty");
83 if (asprintf(&t, "%s/.local/share/gmid", home) == -1)
84 err(1, "asprintf");
85 } else {
86 if (asprintf(&t, "%s/gmid", xdg) == -1)
87 err(1, "asprintf");
88 }
90 mkdirs(t, 0755);
91 return t;
92 }
94 void
95 load_local_cert(const char *hostname, const char *dir)
96 {
97 char *cert, *key;
98 struct vhost *h;
100 if (asprintf(&cert, "%s/%s.cert.pem", dir, hostname) == -1)
101 errx(1, "asprintf");
102 if (asprintf(&key, "%s/%s.key.pem", dir, hostname) == -1)
103 errx(1, "asprintf");
105 if (access(cert, R_OK) == -1 || access(key, R_OK) == -1)
106 gen_certificate(hostname, cert, key);
108 h = TAILQ_FIRST(&hosts);
109 h->cert = cert;
110 h->key = key;
111 h->domain = hostname;
114 void
115 load_vhosts(void)
117 struct vhost *h;
119 TAILQ_FOREACH(h, &hosts, vhosts) {
120 if ((h->dirfd = open(h->dir, O_RDONLY | O_DIRECTORY)) == -1)
121 fatal("open %s for domain %s", h->dir, h->domain);
125 int
126 make_socket(int port, int family)
128 int sock, v;
129 struct sockaddr_in addr4;
130 struct sockaddr_in6 addr6;
131 struct sockaddr *addr;
132 socklen_t len;
134 switch (family) {
135 case AF_INET:
136 bzero(&addr4, sizeof(addr4));
137 addr4.sin_family = family;
138 addr4.sin_port = htons(port);
139 addr4.sin_addr.s_addr = INADDR_ANY;
140 addr = (struct sockaddr*)&addr4;
141 len = sizeof(addr4);
142 break;
144 case AF_INET6:
145 bzero(&addr6, sizeof(addr6));
146 addr6.sin6_family = AF_INET6;
147 addr6.sin6_port = htons(port);
148 addr6.sin6_addr = in6addr_any;
149 addr = (struct sockaddr*)&addr6;
150 len = sizeof(addr6);
151 break;
153 default:
154 /* unreachable */
155 abort();
158 if ((sock = socket(family, SOCK_STREAM, 0)) == -1)
159 fatal("socket: %s", strerror(errno));
161 v = 1;
162 if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) == -1)
163 fatal("setsockopt(SO_REUSEADDR): %s", strerror(errno));
165 v = 1;
166 if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(v)) == -1)
167 fatal("setsockopt(SO_REUSEPORT): %s", strerror(errno));
169 mark_nonblock(sock);
171 if (bind(sock, addr, len) == -1)
172 fatal("bind: %s", strerror(errno));
174 if (listen(sock, 16) == -1)
175 fatal("listen: %s", strerror(errno));
177 return sock;
180 void
181 setup_tls(void)
183 struct vhost *h;
185 if ((tlsconf = tls_config_new()) == NULL)
186 fatal("tls_config_new");
188 /* optionally accept client certs, but don't try to verify them */
189 tls_config_verify_client_optional(tlsconf);
190 tls_config_insecure_noverifycert(tlsconf);
192 if (tls_config_set_protocols(tlsconf, conf.protos) == -1)
193 fatal("tls_config_set_protocols");
195 if ((ctx = tls_server()) == NULL)
196 fatal("tls_server failure");
198 h = TAILQ_FIRST(&hosts);
200 /* we need to set something, then we can add how many key we want */
201 if (tls_config_set_keypair_file(tlsconf, h->cert, h->key))
202 fatal("tls_config_set_keypair_file failed for (%s, %s)",
203 h->cert, h->key);
205 while ((h = TAILQ_NEXT(h, vhosts)) != NULL) {
206 if (tls_config_add_keypair_file(tlsconf, h->cert, h->key) == -1)
207 fatal("failed to load the keypair (%s, %s)",
208 h->cert, h->key);
211 if (tls_configure(ctx, tlsconf) == -1)
212 fatal("tls_configure: %s", tls_error(ctx));
215 static int
216 listener_main(struct imsgbuf *ibuf)
218 drop_priv();
219 load_default_mime(&conf.mime);
220 load_vhosts();
221 loop(ctx, sock4, sock6, ibuf);
222 return 0;
225 void
226 init_config(void)
228 TAILQ_INIT(&hosts);
230 conf.port = 1965;
231 conf.ipv6 = 0;
232 conf.protos = TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3;
234 init_mime(&conf.mime);
236 conf.chroot = NULL;
237 conf.user = NULL;
239 conf.prefork = 3;
242 void
243 free_config(void)
245 struct vhost *h, *th;
246 struct location *l, *tl;
248 free(conf.chroot);
249 free(conf.user);
250 memset(&conf, 0, sizeof(conf));
252 TAILQ_FOREACH_SAFE(h, &hosts, vhosts, th) {
253 TAILQ_FOREACH_SAFE(l, &h->locations, locations, tl) {
254 TAILQ_REMOVE(&h->locations, l, locations);
256 free((char*)l->match);
257 free((char*)l->lang);
258 free((char*)l->default_mime);
259 free((char*)l->index);
260 free((char*)l->block_fmt);
261 free(l);
264 TAILQ_REMOVE(&hosts, h, vhosts);
265 free(h);
268 tls_free(ctx);
269 tls_config_free(tlsconf);
272 static int
273 wait_signal(void)
275 sigset_t mask;
276 int signo;
278 sigemptyset(&mask);
279 sigaddset(&mask, SIGHUP);
280 sigaddset(&mask, SIGINT);
281 sigaddset(&mask, SIGTERM);
282 sigwait(&mask, &signo);
284 return signo == SIGHUP;
287 void
288 drop_priv(void)
290 struct passwd *pw = NULL;
292 if (conf.chroot != NULL && conf.user == NULL)
293 fatal("can't chroot without an user to switch to after.");
295 if (conf.user != NULL) {
296 if ((pw = getpwnam(conf.user)) == NULL)
297 fatal("can't find user %s", conf.user);
300 if (conf.chroot != NULL) {
301 if (chroot(conf.chroot) != 0 || chdir("/") != 0)
302 fatal("%s: %s", conf.chroot, strerror(errno));
305 if (pw != NULL) {
306 if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1)
307 fatal("setresuid(%d): %s", pw->pw_uid,
308 strerror(errno));
311 if (getuid() == 0)
312 log_warn(NULL, "not a good idea to run a network daemon as root");
315 static void
316 usage(const char *me)
318 fprintf(stderr,
319 "USAGE: %s [-fn] [-c config] | [-6h] [-d certs-dir] [-H host]\n"
320 " [-p port] [-x cgi] [dir]\n",
321 me);
324 static void
325 logger_init(void)
327 int p[2];
329 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, p) == -1)
330 err(1, "socketpair");
332 switch (fork()) {
333 case -1:
334 err(1, "fork");
335 case 0:
336 signal(SIGHUP, SIG_IGN);
337 close(p[0]);
338 setproctitle("logger");
339 imsg_init(&logibuf, p[1]);
340 drop_priv();
341 _exit(logger_main(p[1], &logibuf));
342 default:
343 close(p[1]);
344 imsg_init(&logibuf, p[0]);
345 return;
349 static int
350 serve(int argc, char **argv, struct imsgbuf *ibuf)
352 char path[PATH_MAX];
353 int i, p[2];
354 struct vhost *h;
355 struct location *l;
357 if (config_path == NULL) {
358 if (hostname == NULL)
359 hostname = "localhost";
360 if (certs_dir == NULL)
361 certs_dir = data_dir();
362 load_local_cert(hostname, certs_dir);
364 h = TAILQ_FIRST(&hosts);
365 h->domain = "*";
367 l = TAILQ_FIRST(&h->locations);
368 l->auto_index = 1;
369 l->match = "*";
371 switch (argc) {
372 case 0:
373 h->dir = getcwd(path, sizeof(path));
374 break;
375 case 1:
376 h->dir = absolutify_path(argv[0]);
377 break;
378 default:
379 usage(getprogname());
380 return 1;
383 log_notice(NULL, "serving %s on port %d", h->dir, conf.port);
386 /* setup tls before dropping privileges: we don't want user
387 * to put private certs inside the chroot. */
388 setup_tls();
390 for (i = 0; i < conf.prefork; ++i) {
391 if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC,
392 PF_UNSPEC, p) == -1)
393 fatal("socketpair: %s", strerror(errno));
395 switch (fork()) {
396 case -1:
397 fatal("fork: %s", strerror(errno));
398 case 0: /* child */
399 close(p[0]);
400 imsg_init(&exibuf, p[1]);
401 setproctitle("server");
402 _exit(listener_main(&exibuf));
403 default:
404 close(p[1]);
405 imsg_init(&servibuf[i], p[0]);
409 setproctitle("executor");
410 drop_priv();
411 _exit(executor_main(ibuf));
414 static void
415 setup_configless(int argc, char **argv, const char *cgi)
417 struct vhost *host;
418 struct location *loc;
420 host = xcalloc(1, sizeof(*host));
421 host->cgi = cgi;
422 TAILQ_INSERT_HEAD(&hosts, host, vhosts);
424 loc = xcalloc(1, sizeof(*loc));
425 TAILQ_INSERT_HEAD(&host->locations, loc, locations);
427 serve(argc, argv, NULL);
428 imsg_compose(&logibuf, IMSG_QUIT, 0, 0, -1, NULL, 0);
429 imsg_flush(&logibuf);
432 int
433 main(int argc, char **argv)
435 struct imsgbuf exibuf;
436 int ch, conftest = 0, configless = 0;
437 int old_ipv6, old_port;
438 const char *cgi = NULL;
440 init_config();
442 while ((ch = getopt(argc, argv, "6c:d:fH:hnp:vx:")) != -1) {
443 switch (ch) {
444 case '6':
445 conf.ipv6 = 1;
446 configless = 1;
447 break;
449 case 'c':
450 config_path = absolutify_path(optarg);
451 break;
453 case 'd':
454 certs_dir = optarg;
455 configless = 1;
456 break;
458 case 'f':
459 conf.foreground = 1;
460 break;
462 case 'H':
463 hostname = optarg;
464 configless = 1;
465 break;
467 case 'h':
468 usage(*argv);
469 return 0;
471 case 'n':
472 conftest = 1;
473 break;
475 case 'p':
476 conf.port = parse_portno(optarg);
477 configless = 1;
478 break;
480 case 'v':
481 conf.verbose++;
482 break;
484 case 'x':
485 /* drop the starting / (if any) */
486 if (*optarg == '/')
487 optarg++;
488 cgi = optarg;
489 configless = 1;
490 break;
492 default:
493 usage(*argv);
494 return 1;
497 argc -= optind;
498 argv += optind;
500 if (config_path == NULL) {
501 configless = 1;
502 conf.foreground = 1;
503 conf.prefork = 1;
504 conf.verbose++;
507 if (config_path != NULL && (argc > 0 || configless))
508 err(1, "can't specify options in config mode.");
510 if (conftest) {
511 parse_conf(config_path);
512 puts("config OK");
513 return 0;
516 if (!conf.foreground && !configless) {
517 if (daemon(1, 1) == -1)
518 err(1, "daemon");
521 if (config_path != NULL)
522 parse_conf(config_path);
524 logger_init();
526 sock4 = make_socket(conf.port, AF_INET);
527 sock6 = -1;
528 if (conf.ipv6)
529 sock6 = make_socket(conf.port, AF_INET6);
531 signal(SIGPIPE, SIG_IGN);
532 signal(SIGCHLD, SIG_IGN);
534 if (configless) {
535 setup_configless(argc, argv, cgi);
536 return 0;
539 /* Linux seems to call the event handlers even when we're
540 * doing a sigwait. These dummy handlers is here to avoid
541 * being terminated on SIGHUP, SIGINT or SIGTERM. */
542 signal(SIGHUP, dummy_handler);
543 signal(SIGINT, dummy_handler);
544 signal(SIGTERM, dummy_handler);
546 /* wait a sighup and reload the daemon */
547 for (;;) {
548 int p[2];
550 if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC,
551 PF_UNSPEC, p) == -1)
552 fatal("socketpair: %s", strerror(errno));
554 switch (fork()) {
555 case -1:
556 fatal("fork: %s", strerror(errno));
557 case 0:
558 close(p[0]);
559 imsg_init(&exibuf, p[1]);
560 _exit(serve(argc, argv, &exibuf));
563 close(p[1]);
564 imsg_init(&exibuf, p[0]);
566 if (!wait_signal())
567 break;
569 log_info(NULL, "reloading configuration %s", config_path);
571 /* close the executor (it'll close the servers too) */
572 imsg_compose(&exibuf, IMSG_QUIT, 0, 0, -1, NULL, 0);
573 imsg_flush(&exibuf);
574 close(p[0]);
576 old_ipv6 = conf.ipv6;
577 old_port = conf.port;
579 free_config();
580 init_config();
581 parse_conf(config_path);
583 if (old_port != conf.port) {
584 close(sock4);
585 close(sock6);
586 sock4 = -1;
587 sock6 = -1;
590 if (sock6 != -1 && old_ipv6 != conf.ipv6) {
591 close(sock6);
592 sock6 = -1;
595 if (sock4 == -1)
596 sock4 = make_socket(conf.port, AF_INET);
597 if (sock6 == -1 && conf.ipv6)
598 sock6 = make_socket(conf.port, AF_INET6);
601 imsg_compose(&exibuf, IMSG_QUIT, 0, 0, -1, NULL, 0);
602 imsg_flush(&exibuf);
604 imsg_compose(&logibuf, IMSG_QUIT, 0, 0, -1, NULL, 0);
605 imsg_flush(&logibuf);
607 return 0;