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Date:: Thu Sep 8 20:44:35 2022 UTC
Message:: drop the configless mode from gmid; now it's provided by `ge'
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1 /*
2  * Copyright (c) 2020, 2021, 2022 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  */
16 
17 #include "gmid.h"
18 
19 #include <sys/stat.h>
20 
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>
29 
30 static const char	*opts = "c:D:fhnP:Vv";
31 
32 static const struct option longopts[] = {
33 	{"help",	no_argument,		NULL,	'h'},
34 	{"version",	no_argument,		NULL,	'V'},
35 	{NULL,		0,			NULL,	0},
36 };
37 
38 struct fcgi fcgi[FCGI_MAX];
39 
40 struct vhosthead hosts;
41 
42 int sock4, sock6;
43 
44 struct imsgbuf logibuf, exibuf, servibuf[PROC_MAX];
45 
46 const char *config_path = "/etc/gmid.conf";
47 const char *pidfile;
48 
49 struct conf conf;
50 
51 struct tls_config *tlsconf;
52 struct tls *ctx;
53 
54 static void
55 dummy_handler(int signo)
56 {
57 	return;
58 }
59 
60 void
61 load_vhosts(void)
62 {
63 	struct vhost	*h;
64 	struct location	*l;
65 
66 	TAILQ_FOREACH(h, &hosts, vhosts) {
67 		TAILQ_FOREACH(l, &h->locations, locations) {
68 			if (l->dir == NULL)
69 				continue;
70 			if ((l->dirfd = open(l->dir, O_RDONLY | O_DIRECTORY)) == -1)
71 				fatal("open %s for domain %s: %s", l->dir, h->domain,
72 				    strerror(errno));
73 		}
74 	}
75 }
76 
77 int
78 make_socket(int port, int family)
79 {
80 	int sock, v;
81 	struct sockaddr_in addr4;
82 	struct sockaddr_in6 addr6;
83 	struct sockaddr *addr;
84 	socklen_t len;
85 
86 	switch (family) {
87 	case AF_INET:
88 		memset(&addr4, 0, sizeof(addr4));
89 		addr4.sin_family = family;
90 		addr4.sin_port = htons(port);
91 		addr4.sin_addr.s_addr = INADDR_ANY;
92 		addr = (struct sockaddr*)&addr4;
93 		len = sizeof(addr4);
94 		break;
95 
96 	case AF_INET6:
97 		memset(&addr6, 0, sizeof(addr6));
98 		addr6.sin6_family = AF_INET6;
99 		addr6.sin6_port = htons(port);
100 		addr6.sin6_addr = in6addr_any;
101 		addr = (struct sockaddr*)&addr6;
102 		len = sizeof(addr6);
103 		break;
104 
105 	default:
106 		/* unreachable */
107 		abort();
108 	}
109 
110 	if ((sock = socket(family, SOCK_STREAM, 0)) == -1)
111 		fatal("socket: %s", strerror(errno));
112 
113 	v = 1;
114 	if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) == -1)
115 		fatal("setsockopt(SO_REUSEADDR): %s", strerror(errno));
116 
117 	v = 1;
118 	if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(v)) == -1)
119 		fatal("setsockopt(SO_REUSEPORT): %s", strerror(errno));
120 
121 	mark_nonblock(sock);
122 
123 	if (bind(sock, addr, len) == -1)
124 		fatal("bind: %s", strerror(errno));
125 
126 	if (listen(sock, 16) == -1)
127 		fatal("listen: %s", strerror(errno));
128 
129 	return sock;
130 }
131 
132 static void
133 add_keypair(struct vhost *h)
134 {
135 	if (h->ocsp == NULL) {
136 		if (tls_config_add_keypair_file(tlsconf, h->cert, h->key) == -1)
137 			fatal("failed to load the keypair (%s, %s)",
138 			    h->cert, h->key);
139 	} else {
140 		if (tls_config_add_keypair_ocsp_file(tlsconf, h->cert, h->key,
141 		    h->ocsp) == -1)
142 			fatal("failed to load the keypair (%s, %s, %s)",
143 			    h->cert, h->key, h->ocsp);
144 	}
145 }
146 
147 void
148 setup_tls(void)
149 {
150 	struct vhost *h;
151 
152 	if ((tlsconf = tls_config_new()) == NULL)
153 		fatal("tls_config_new");
154 
155 	/* optionally accept client certs, but don't try to verify them */
156 	tls_config_verify_client_optional(tlsconf);
157 	tls_config_insecure_noverifycert(tlsconf);
158 
159 	if (tls_config_set_protocols(tlsconf, conf.protos) == -1)
160 		fatal("tls_config_set_protocols");
161 
162 	if ((ctx = tls_server()) == NULL)
163 		fatal("tls_server failure");
164 
165 	h = TAILQ_FIRST(&hosts);
166 
167 	/* we need to set something, then we can add how many key we want */
168 	if (tls_config_set_keypair_file(tlsconf, h->cert, h->key))
169 		fatal("tls_config_set_keypair_file failed for (%s, %s)",
170 		    h->cert, h->key);
171 
172 	/* same for OCSP */
173 	if (h->ocsp != NULL &&
174 	    tls_config_set_ocsp_staple_file(tlsconf, h->ocsp) == -1)
175 		fatal("tls_config_set_ocsp_staple_file failed for (%s)",
176 		    h->ocsp);
177 
178 	while ((h = TAILQ_NEXT(h, vhosts)) != NULL)
179 		add_keypair(h);
180 
181 	if (tls_configure(ctx, tlsconf) == -1)
182 		fatal("tls_configure: %s", tls_error(ctx));
183 }
184 
185 static int
186 listener_main(struct imsgbuf *ibuf)
187 {
188 	drop_priv();
189 	if (!conf.mime.skip_defaults && load_default_mime(&conf.mime) == -1)
190 		fatal("load_default_mime: %s", strerror(errno));
191 	sort_mime(&conf.mime);
192 	load_vhosts();
193 	loop(ctx, sock4, sock6, ibuf);
194 	return 0;
195 }
196 
197 void
198 init_config(void)
199 {
200 	TAILQ_INIT(&hosts);
201 
202 	conf.port = 1965;
203 	conf.ipv6 = 0;
204 	conf.protos = TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3;
205 
206 	init_mime(&conf.mime);
207 
208 	conf.chroot = NULL;
209 	conf.user = NULL;
210 
211 	conf.prefork = 3;
212 }
213 
214 void
215 free_config(void)
216 {
217 	struct vhost *h, *th;
218 	struct location *l, *tl;
219 	struct proxy *p, *tp;
220 	struct envlist *e, *te;
221 	struct alist *a, *ta;
222 	int v, i;
223 
224 	v = conf.verbose;
225 
226 	free_mime(&conf.mime);
227 	free(conf.chroot);
228 	free(conf.user);
229 	memset(&conf, 0, sizeof(conf));
230 
231 	conf.verbose = v;
232 
233 	TAILQ_FOREACH_SAFE(h, &hosts, vhosts, th) {
234 		TAILQ_FOREACH_SAFE(l, &h->locations, locations, tl) {
235 			TAILQ_REMOVE(&h->locations, l, locations);
236 
237 			free((char*)l->match);
238 			free((char*)l->lang);
239 			free((char*)l->default_mime);
240 			free((char*)l->index);
241 			free((char*)l->block_fmt);
242 			free((char*)l->dir);
243 
244 			if (l->dirfd != -1)
245 				close(l->dirfd);
246 
247 			free(l);
248 		}
249 
250 		TAILQ_FOREACH_SAFE(e, &h->env, envs, te) {
251 			TAILQ_REMOVE(&h->env, e, envs);
252 
253 			free(e->name);
254 			free(e->value);
255 			free(e);
256 		}
257 
258 		TAILQ_FOREACH_SAFE(e, &h->params, envs, te) {
259 			TAILQ_REMOVE(&h->params, e, envs);
260 
261 			free(e->name);
262 			free(e->value);
263 			free(e);
264 		}
265 
266 		TAILQ_FOREACH_SAFE(a, &h->aliases, aliases, ta) {
267 			TAILQ_REMOVE(&h->aliases, a, aliases);
268 
269 			free(a->alias);
270 			free(a);
271 		}
272 
273 		TAILQ_FOREACH_SAFE(p, &h->proxies, proxies, tp) {
274 			TAILQ_REMOVE(&h->proxies, p, proxies);
275 
276 			free(p->match_proto);
277 			free(p->match_host);
278 			free(p->host);
279 			free(p->sni);
280 			tls_unload_file(p->cert, p->certlen);
281 			tls_unload_file(p->key, p->keylen);
282 			free(p);
283 		}
284 
285 		free((char*)h->domain);
286 		free((char*)h->cert);
287 		free((char*)h->key);
288 		free((char*)h->ocsp);
289 		free((char*)h->entrypoint);
290 
291 		TAILQ_REMOVE(&hosts, h, vhosts);
292 		free(h);
293 	}
294 
295 	for (i = 0; i < FCGI_MAX; ++i) {
296 		if (fcgi[i].path == NULL && fcgi[i].prog == NULL)
297 			break;
298 		free(fcgi[i].path);
299 		free(fcgi[i].port);
300 		free(fcgi[i].prog);
301 
302 		fcgi[i].path = NULL;
303 		fcgi[i].port = NULL;
304 		fcgi[i].prog = NULL;
305 	}
306 
307 	tls_free(ctx);
308 	tls_config_free(tlsconf);
309 }
310 
311 static int
312 wait_signal(void)
313 {
314 	sigset_t mask;
315 	int signo;
316 
317 	sigemptyset(&mask);
318 	sigaddset(&mask, SIGHUP);
319 	sigaddset(&mask, SIGINT);
320 	sigaddset(&mask, SIGTERM);
321 	sigwait(&mask, &signo);
322 
323 	return signo == SIGHUP;
324 }
325 
326 void
327 drop_priv(void)
328 {
329 	struct passwd *pw = NULL;
330 
331 	if (conf.chroot != NULL && conf.user == NULL)
332 		fatal("can't chroot without an user to switch to after.");
333 
334 	if (conf.user != NULL) {
335 		if ((pw = getpwnam(conf.user)) == NULL)
336 			fatal("can't find user %s", conf.user);
337 	}
338 
339 	if (conf.chroot != NULL) {
340 		if (chroot(conf.chroot) != 0 || chdir("/") != 0)
341 			fatal("%s: %s", conf.chroot, strerror(errno));
342 	}
343 
344 	if (pw != NULL) {
345 		if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1)
346 			fatal("setresuid(%d): %s", pw->pw_uid,
347 			    strerror(errno));
348 	}
349 
350 	if (getuid() == 0)
351 		log_warn(NULL, "not a good idea to run a network daemon as root");
352 }
353 
354 static void
355 usage(void)
356 {
357 	fprintf(stderr,
358 	    "Version: " GMID_STRING "\n"
359 	    "Usage: %s [-fnv] [-c config] [-D macro=value] [-P pidfile]\n",
360 	    getprogname());
361 }
362 
363 static void
364 logger_init(void)
365 {
366 	int p[2];
367 
368 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, p) == -1)
369 		err(1, "socketpair");
370 
371 	switch (fork()) {
372 	case -1:
373 		err(1, "fork");
374 	case 0:
375 		signal(SIGHUP, SIG_IGN);
376 		close(p[0]);
377 		setproctitle("logger");
378 		imsg_init(&logibuf, p[1]);
379 		drop_priv();
380 		_exit(logger_main(p[1], &logibuf));
381 	default:
382 		close(p[1]);
383 		imsg_init(&logibuf, p[0]);
384 		return;
385 	}
386 }
387 
388 static void
389 serve(void)
390 {
391 	int i, p[2];
392 
393 	/* setup tls before dropping privileges: we don't want user
394 	 * to put private certs inside the chroot. */
395 	setup_tls();
396 
397 	for (i = 0; i < conf.prefork; ++i) {
398 		if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC,
399 		    PF_UNSPEC, p) == -1)
400 			fatal("socketpair: %s", strerror(errno));
401 
402 		switch (fork()) {
403 		case -1:
404 			fatal("fork: %s", strerror(errno));
405 		case 0:		/* child */
406 			close(p[0]);
407 			imsg_init(&exibuf, p[1]);
408 			setproctitle("server");
409 			_exit(listener_main(&exibuf));
410 		default:
411 			close(p[1]);
412 			imsg_init(&servibuf[i], p[0]);
413 		}
414 	}
415 }
416 
417 static int
418 write_pidfile(const char *pidfile)
419 {
420 	struct flock	lock;
421 	int		fd;
422 
423 	if (pidfile == NULL)
424 		return -1;
425 
426 	if ((fd = open(pidfile, O_WRONLY|O_CREAT|O_CLOEXEC, 0600)) == -1)
427 		fatal("can't open pidfile %s: %s", pidfile, strerror(errno));
428 
429 	lock.l_start = 0;
430 	lock.l_len = 0;
431 	lock.l_type = F_WRLCK;
432 	lock.l_whence = SEEK_SET;
433 
434 	if (fcntl(fd, F_SETLK, &lock) == -1)
435 		fatal("can't lock %s, gmid is already running?", pidfile);
436 
437 	if (ftruncate(fd, 0) == -1)
438 		fatal("ftruncate: %s: %s", pidfile, strerror(errno));
439 
440 	dprintf(fd, "%d\n", getpid());
441 
442 	return fd;
443 }
444 
445 int
446 main(int argc, char **argv)
447 {
448 	int i, ch, conftest = 0;
449 	int pidfd, old_ipv6, old_port;
450 
451 	logger_init();
452 	init_config();
453 
454 	while ((ch = getopt_long(argc, argv, opts, longopts, NULL)) != -1) {
455 		switch (ch) {
456 		case 'c':
457 			config_path = absolutify_path(optarg);
458 			break;
459 
460 		case 'D':
461 			if (cmdline_symset(optarg) == -1)
462 				fatal("could not parse macro definition: %s",
463 				    optarg);
464 			break;
465 
466 		case 'f':
467 			conf.foreground = 1;
468 			break;
469 
470 		case 'h':
471 			usage();
472 			return 0;
473 
474 		case 'n':
475 			conftest++;
476 			break;
477 
478 		case 'P':
479 			pidfile = optarg;
480 			break;
481 
482 		case 'V':
483 			puts("Version: " GMID_STRING);
484 			return 0;
485 
486 		case 'v':
487 			conf.verbose++;
488 			break;
489 
490 		default:
491 			usage();
492 			return 1;
493 		}
494 	}
495 	argc -= optind;
496 	argv += optind;
497 
498 	if (argc != 0)
499 		usage();
500 
501 	parse_conf(config_path);
502 
503 	if (conftest) {
504 		fprintf(stderr, "config OK\n");
505 		if (conftest > 1)
506 			print_conf();
507 		return 0;
508 	}
509 
510 	if (!conf.foreground) {
511 		/* log to syslog */
512 		imsg_compose(&logibuf, IMSG_LOG_TYPE, 0, 0, -1, NULL, 0);
513 		imsg_flush(&logibuf);
514 
515 		if (daemon(1, 1) == -1)
516 			fatal("daemon: %s", strerror(errno));
517 	}
518 
519 	sock4 = make_socket(conf.port, AF_INET);
520 	sock6 = -1;
521 	if (conf.ipv6)
522 		sock6 = make_socket(conf.port, AF_INET6);
523 
524 	signal(SIGPIPE, SIG_IGN);
525 
526 	pidfd = write_pidfile(pidfile);
527 
528 	/*
529 	 * Linux seems to call the event handlers even when we're
530 	 * doing a sigwait.  These dummy handlers are here to avoid
531 	 * being terminated on SIGHUP, SIGINT or SIGTERM.
532 	 */
533 	signal(SIGHUP, dummy_handler);
534 	signal(SIGINT, dummy_handler);
535 	signal(SIGTERM, dummy_handler);
536 
537 	/* wait a sighup and reload the daemon */
538 	for (;;) {
539 		serve();
540 
541 		if (!wait_signal())
542 			break;
543 
544 		log_info(NULL, "reloading configuration %s", config_path);
545 
546 		/* close the servers */
547 		for (i = 0; i < conf.prefork; ++i) {
548 			imsg_compose(&servibuf[i], IMSG_QUIT, 0, 0, -1, NULL, 0);
549 			imsg_flush(&servibuf[i]);
550 			close(servibuf[i].fd);
551 		}
552 
553 		old_ipv6 = conf.ipv6;
554 		old_port = conf.port;
555 
556 		free_config();
557 		init_config();
558 		parse_conf(config_path);
559 
560 		if (old_port != conf.port) {
561 			close(sock4);
562 			close(sock6);
563 			sock4 = -1;
564 			sock6 = -1;
565 		}
566 
567 		if (sock6 != -1 && old_ipv6 != conf.ipv6) {
568 			close(sock6);
569 			sock6 = -1;
570 		}
571 
572 		if (sock4 == -1)
573 			sock4 = make_socket(conf.port, AF_INET);
574 		if (sock6 == -1 && conf.ipv6)
575 			sock6 = make_socket(conf.port, AF_INET6);
576 	}
577 
578 	imsg_compose(&exibuf, IMSG_QUIT, 0, 0, -1, NULL, 0);
579 	imsg_flush(&exibuf);
580 
581 	imsg_compose(&logibuf, IMSG_QUIT, 0, 0, -1, NULL, 0);
582 	imsg_flush(&logibuf);
583 
584 	if (pidfd != -1)
585 		close(pidfd);
586 
587 	return 0;
588 }