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Date:: Wed Mar 31 13:56:58 2021 UTC
Message:: fix mkdirs: create directories recursively
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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  */
16 
17 #include "gmid.h"
18 
19 #include <sys/stat.h>
20 
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>
28 
29 struct vhost hosts[HOSTSLEN];
30 
31 int sock4, sock6;
32 
33 struct imsgbuf logibuf, exibuf, servibuf[PROC_MAX];
34 
35 const char *config_path, *certs_dir, *hostname;
36 
37 struct conf conf;
38 
39 struct tls_config *tlsconf;
40 struct tls *ctx;
41 
42 static void
43 dummy_handler(int signo)
44 {
45 	return;
46 }
47 
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;
54 
55 	strlcpy(p, path, sizeof(p));
56 	t = dirname(p);
57 	memmove(dn, t, strlen(t)+1);
58 }
59 
60 static void
61 mkdirs(const char *path, mode_t mode)
62 {
63 	char	dname[PATH_MAX+1];
64 
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 }
72 
73 /* $XDG_DATA_HOME/gmid */
74 char *
75 data_dir(void)
76 {
77 	const char *home, *xdg;
78 	char *t;
79 
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 	}
89 
90 	mkdirs(t, 0755);
91 	return t;
92 }
93 
94 void
95 load_local_cert(const char *hostname, const char *dir)
96 {
97 	char *cert, *key;
98 
99 	if (asprintf(&cert, "%s/%s.cert.pem", dir, hostname) == -1)
100 		errx(1, "asprintf");
101 	if (asprintf(&key, "%s/%s.key.pem", dir, hostname) == -1)
102 		errx(1, "asprintf");
103 
104 	if (access(cert, R_OK) == -1 || access(key, R_OK) == -1)
105 		gen_certificate(hostname, cert, key);
106 
107 	hosts[0].cert = cert;
108 	hosts[0].key = key;
109 	hosts[0].domain = hostname;
110 }
111 
112 void
113 load_vhosts(void)
114 {
115 	struct vhost *h;
116 
117 	for (h = hosts; h->domain != NULL; ++h) {
118 		if ((h->dirfd = open(h->dir, O_RDONLY | O_DIRECTORY)) == -1)
119 			fatal("open %s for domain %s", h->dir, h->domain);
120 	}
121 }
122 
123 int
124 make_socket(int port, int family)
125 {
126 	int sock, v;
127 	struct sockaddr_in addr4;
128 	struct sockaddr_in6 addr6;
129 	struct sockaddr *addr;
130 	socklen_t len;
131 
132         switch (family) {
133 	case AF_INET:
134 		bzero(&addr4, sizeof(addr4));
135 		addr4.sin_family = family;
136 		addr4.sin_port = htons(port);
137 		addr4.sin_addr.s_addr = INADDR_ANY;
138 		addr = (struct sockaddr*)&addr4;
139 		len = sizeof(addr4);
140 		break;
141 
142 	case AF_INET6:
143 		bzero(&addr6, sizeof(addr6));
144 		addr6.sin6_family = AF_INET6;
145 		addr6.sin6_port = htons(port);
146 		addr6.sin6_addr = in6addr_any;
147 		addr = (struct sockaddr*)&addr6;
148 		len = sizeof(addr6);
149 		break;
150 
151 	default:
152 		/* unreachable */
153 		abort();
154 	}
155 
156 	if ((sock = socket(family, SOCK_STREAM, 0)) == -1)
157 		fatal("socket: %s", strerror(errno));
158 
159 	v = 1;
160 	if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) == -1)
161 		fatal("setsockopt(SO_REUSEADDR): %s", strerror(errno));
162 
163 	v = 1;
164 	if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(v)) == -1)
165 		fatal("setsockopt(SO_REUSEPORT): %s", strerror(errno));
166 
167 	mark_nonblock(sock);
168 
169 	if (bind(sock, addr, len) == -1)
170 		fatal("bind: %s", strerror(errno));
171 
172 	if (listen(sock, 16) == -1)
173 		fatal("listen: %s", strerror(errno));
174 
175 	return sock;
176 }
177 
178 void
179 setup_tls(void)
180 {
181 	struct vhost *h;
182 
183 	if ((tlsconf = tls_config_new()) == NULL)
184 		fatal("tls_config_new");
185 
186 	/* optionally accept client certs, but don't try to verify them */
187 	tls_config_verify_client_optional(tlsconf);
188 	tls_config_insecure_noverifycert(tlsconf);
189 
190 	if (tls_config_set_protocols(tlsconf, conf.protos) == -1)
191 		fatal("tls_config_set_protocols");
192 
193 	if ((ctx = tls_server()) == NULL)
194 		fatal("tls_server failure");
195 
196 	/* we need to set something, then we can add how many key we want */
197 	if (tls_config_set_keypair_file(tlsconf, hosts->cert, hosts->key))
198 		fatal("tls_config_set_keypair_file failed for (%s, %s)",
199 		    hosts->cert, hosts->key);
200 
201 	for (h = &hosts[1]; h->domain != NULL; ++h) {
202 		if (tls_config_add_keypair_file(tlsconf, h->cert, h->key) == -1)
203 			fatal("failed to load the keypair (%s, %s)",
204 			    h->cert, h->key);
205 	}
206 
207 	if (tls_configure(ctx, tlsconf) == -1)
208 		fatal("tls_configure: %s", tls_error(ctx));
209 }
210 
211 static int
212 listener_main(struct imsgbuf *ibuf)
213 {
214 	drop_priv();
215 	load_default_mime(&conf.mime);
216 	load_vhosts();
217 	loop(ctx, sock4, sock6, ibuf);
218 	return 0;
219 }
220 
221 void
222 init_config(void)
223 {
224 	size_t i;
225 
226 	bzero(hosts, sizeof(hosts));
227 	for (i = 0; i < HOSTSLEN; ++i)
228 		hosts[i].dirfd = -1;
229 
230 	conf.port = 1965;
231 	conf.ipv6 = 0;
232 	conf.protos = TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3;
233 
234 	init_mime(&conf.mime);
235 
236 	conf.chroot = NULL;
237 	conf.user = NULL;
238 
239 	/* we'll change this to 0 when running without config. */
240 	conf.prefork = 3;
241 }
242 
243 void
244 free_config(void)
245 {
246 	struct vhost *h;
247 	struct location *l;
248 
249 	free(conf.chroot);
250 	free(conf.user);
251 	memset(&conf, 0, sizeof(conf));
252 
253 	for (h = hosts; h->domain != NULL; ++h) {
254 		free((char*)h->domain);
255 		free((char*)h->cert);
256 		free((char*)h->key);
257 		free((char*)h->dir);
258 		free((char*)h->cgi);
259 		free((char*)h->entrypoint);
260 
261 		for (l = h->locations; l->match != NULL; ++l) {
262 			free((char*)l->match);
263 			free((char*)l->lang);
264 			free((char*)l->default_mime);
265 			free((char*)l->index);
266 			free((char*)l->block_fmt);
267 		}
268 	}
269 	memset(hosts, 0, sizeof(hosts));
270 
271 	tls_free(ctx);
272 	tls_config_free(tlsconf);
273 }
274 
275 static int
276 wait_signal(void)
277 {
278 	sigset_t mask;
279 	int signo;
280 
281 	sigemptyset(&mask);
282 	sigaddset(&mask, SIGHUP);
283 	sigaddset(&mask, SIGINT);
284 	sigaddset(&mask, SIGTERM);
285 	sigwait(&mask, &signo);
286 
287 	return signo == SIGHUP;
288 }
289 
290 void
291 drop_priv(void)
292 {
293 	struct passwd *pw = NULL;
294 
295 	if (conf.chroot != NULL && conf.user == NULL)
296 		fatal("can't chroot without an user to switch to after.");
297 
298 	if (conf.user != NULL) {
299 		if ((pw = getpwnam(conf.user)) == NULL)
300 			fatal("can't find user %s", conf.user);
301 	}
302 
303 	if (conf.chroot != NULL) {
304 		if (chroot(conf.chroot) != 0 || chdir("/") != 0)
305 			fatal("%s: %s", conf.chroot, strerror(errno));
306 	}
307 
308 	if (pw != NULL) {
309 		if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1)
310 			fatal("setresuid(%d): %s", pw->pw_uid,
311 			    strerror(errno));
312 	}
313 
314 	if (getuid() == 0)
315 		log_warn(NULL, "not a good idea to run a network daemon as root");
316 }
317 
318 static void
319 usage(const char *me)
320 {
321 	fprintf(stderr,
322 	    "USAGE: %s [-fn] [-c config] | [-6h] [-d certs-dir] [-H host]\n"
323 	    "       [-p port] [-x cgi] [dir]\n",
324 	    me);
325 }
326 
327 static void
328 logger_init(void)
329 {
330 	int p[2];
331 
332 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, p) == -1)
333 		err(1, "socketpair");
334 
335 	switch (fork()) {
336 	case -1:
337 		err(1, "fork");
338 	case 0:
339 		signal(SIGHUP, SIG_IGN);
340 		close(p[0]);
341 		setproctitle("logger");
342 		imsg_init(&logibuf, p[1]);
343 		drop_priv();
344 		_exit(logger_main(p[1], &logibuf));
345 	default:
346 		close(p[1]);
347 		imsg_init(&logibuf, p[0]);
348 		return;
349 	}
350 }
351 
352 static int
353 serve(int argc, char **argv, struct imsgbuf *ibuf)
354 {
355 	char	path[PATH_MAX];
356 	int	i, p[2];
357 
358         if (config_path == NULL) {
359 		if (hostname == NULL)
360 			hostname = "localhost";
361 		if (certs_dir == NULL)
362 			certs_dir = data_dir();
363 		load_local_cert(hostname, certs_dir);
364 
365 		hosts[0].domain = "*";
366 		hosts[0].locations[0].auto_index = 1;
367 		hosts[0].locations[0].match = "*";
368 
369 		switch (argc) {
370 		case 0:
371 			hosts[0].dir = getcwd(path, sizeof(path));
372 			break;
373 		case 1:
374 			hosts[0].dir = absolutify_path(argv[0]);
375 			break;
376 		default:
377 			usage(getprogname());
378 			return 1;
379 		}
380 
381 		log_notice(NULL, "serving %s on port %d", hosts[0].dir, conf.port);
382 	}
383 
384 	/* setup tls before dropping privileges: we don't want user
385 	 * to put private certs inside the chroot. */
386 	setup_tls();
387 
388 	for (i = 0; i < conf.prefork; ++i) {
389 		if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC,
390 		    PF_UNSPEC, p) == -1)
391 			fatal("socketpair: %s", strerror(errno));
392 
393 		switch (fork()) {
394 		case -1:
395 			fatal("fork: %s", strerror(errno));
396 		case 0:		/* child */
397 			close(p[0]);
398 			imsg_init(&exibuf, p[1]);
399 			setproctitle("server");
400 			_exit(listener_main(&exibuf));
401 		default:
402 			close(p[1]);
403 			imsg_init(&servibuf[i], p[0]);
404 		}
405 	}
406 
407 	setproctitle("executor");
408 	drop_priv();
409 	_exit(executor_main(ibuf));
410 }
411 
412 int
413 main(int argc, char **argv)
414 {
415 	struct imsgbuf exibuf;
416 	int ch, conftest = 0, configless = 0;
417 	int old_ipv6, old_port;
418 
419 	init_config();
420 
421 	while ((ch = getopt(argc, argv, "6c:d:fH:hnp:vx:")) != -1) {
422 		switch (ch) {
423 		case '6':
424 			conf.ipv6 = 1;
425 			configless = 1;
426 			break;
427 
428 		case 'c':
429 			config_path = absolutify_path(optarg);
430 			break;
431 
432 		case 'd':
433 			certs_dir = optarg;
434 			configless = 1;
435 			break;
436 
437 		case 'f':
438 			conf.foreground = 1;
439 			break;
440 
441 		case 'H':
442 			hostname = optarg;
443 			configless = 1;
444 			break;
445 
446 		case 'h':
447 			usage(*argv);
448 			return 0;
449 
450 		case 'n':
451 			conftest = 1;
452 			break;
453 
454 		case 'p':
455 			conf.port = parse_portno(optarg);
456 			configless = 1;
457 			break;
458 
459 		case 'v':
460 			conf.verbose++;
461 			break;
462 
463 		case 'x':
464 			/* drop the starting / (if any) */
465 			if (*optarg == '/')
466 				optarg++;
467 			hosts[0].cgi = optarg;
468 			configless = 1;
469 			break;
470 
471 		default:
472 			usage(*argv);
473 			return 1;
474 		}
475 	}
476 	argc -= optind;
477 	argv += optind;
478 
479 	if (config_path == NULL) {
480 		configless = 1;
481 		conf.foreground = 1;
482 		conf.prefork = 1;
483 		conf.verbose++;
484 	}
485 
486 	if (config_path != NULL && (argc > 0 || configless))
487 		err(1, "can't specify options in config mode.");
488 
489 	if (conftest) {
490 		parse_conf(config_path);
491 		puts("config OK");
492 		return 0;
493 	}
494 
495 	signal(SIGPIPE, SIG_IGN);
496 	signal(SIGCHLD, SIG_IGN);
497 
498 	if (!conf.foreground && !configless) {
499 		if (daemon(1, 1) == -1)
500 			err(1, "daemon");
501 	}
502 
503 	if (config_path != NULL)
504 		parse_conf(config_path);
505 
506 	logger_init();
507 
508 	sock4 = make_socket(conf.port, AF_INET);
509 	sock6 = -1;
510 	if (conf.ipv6)
511 		sock6 = make_socket(conf.port, AF_INET6);
512 
513 	if (configless) {
514 		serve(argc, argv, NULL);
515 		imsg_compose(&logibuf, IMSG_QUIT, 0, 0, -1, NULL, 0);
516 		imsg_flush(&logibuf);
517 		return 0;
518 	}
519 
520 
521 	/* Linux seems to call the event handlers even when we're
522 	 * doing a sigwait.  These dummy handlers is here to avoid
523 	 * being terminated on SIGHUP, SIGTERM or SIGINFO. */
524 	signal(SIGHUP, dummy_handler);
525 	signal(SIGINT, dummy_handler);
526 	signal(SIGTERM, dummy_handler);
527 
528 	/* wait a sighup and reload the daemon */
529 	for (;;) {
530 		int p[2];
531 
532 		if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC,
533 		    PF_UNSPEC, p) == -1)
534 			fatal("socketpair: %s", strerror(errno));
535 
536 		switch (fork()) {
537 		case -1:
538 			fatal("fork: %s", strerror(errno));
539 		case 0:
540 			close(p[0]);
541 			imsg_init(&exibuf, p[1]);
542 			_exit(serve(argc, argv, &exibuf));
543 		}
544 
545 		close(p[1]);
546 		imsg_init(&exibuf, p[0]);
547 
548 		if (!wait_signal())
549 			break;
550 
551 		log_info(NULL, "reloading configuration %s", config_path);
552 
553 		/* close the executor (it'll close the servers too) */
554 		imsg_compose(&exibuf, IMSG_QUIT, 0, 0, -1, NULL, 0);
555 		imsg_flush(&exibuf);
556 		close(p[0]);
557 
558 		old_ipv6 = conf.ipv6;
559 		old_port = conf.port;
560 
561 		free_config();
562 		init_config();
563 		parse_conf(config_path);
564 
565 		if (old_port != conf.port) {
566 			close(sock4);
567 			close(sock6);
568 			sock4 = -1;
569 			sock6 = -1;
570 		}
571 
572 		if (sock6 != -1 && old_ipv6 != conf.ipv6) {
573 			close(sock6);
574 			sock6 = -1;
575 		}
576 
577 		if (sock4 == -1)
578 			sock4 = make_socket(conf.port, AF_INET);
579 		if (sock6 == -1 && conf.ipv6)
580 			sock6 = make_socket(conf.port, AF_INET6);
581 	}
582 
583 	imsg_compose(&exibuf, IMSG_QUIT, 0, 0, -1, NULL, 0);
584 	imsg_flush(&exibuf);
585 
586 	imsg_compose(&logibuf, IMSG_QUIT, 0, 0, -1, NULL, 0);
587 	imsg_flush(&logibuf);
588 
589 	return 0;
590 }