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Date:: Thu Jan 28 14:21:57 2021 UTC
Message:: remove unused function
Actions:: History | Blame | Raw File
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 <sys/stat.h>
18 
19 #include <errno.h>
20 #include <fcntl.h>
21 #include <limits.h>
22 #include <netdb.h>
23 #include <pwd.h>
24 #include <signal.h>
25 #include <stdarg.h>
26 #include <string.h>
27 
28 #include <openssl/pem.h>
29 #include <openssl/x509.h>
30 
31 #include "gmid.h"
32 
33 struct vhost hosts[HOSTSLEN];
34 
35 int exfd, foreground, verbose;
36 
37 struct conf conf;
38 
39 struct tls *ctx;
40 
41 void
42 fatal(const char *fmt, ...)
43 {
44 	va_list ap;
45 
46 	va_start(ap, fmt);
47 
48 	if (foreground) {
49 		vfprintf(stderr, fmt, ap);
50 		fprintf(stderr, "\n");
51 	} else
52 		vsyslog(LOG_DAEMON | LOG_CRIT, fmt, ap);
53 
54 	va_end(ap);
55 	exit(1);
56 }
57 
58 void
59 logs(int priority, struct client *c,
60     const char *fmt, ...)
61 {
62 	char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
63 	char *fmted, *s;
64 	size_t len;
65 	int ec;
66 	va_list ap;
67 
68 	if (foreground && !verbose) {
69 		if (priority == LOG_DEBUG || priority == LOG_INFO)
70 			return;
71 	}
72 
73 	va_start(ap, fmt);
74 
75 	if (c == NULL) {
76 		strncpy(hbuf, "<internal>", sizeof(hbuf));
77 		sbuf[0] = '\0';
78 	} else {
79 		len = sizeof(c->addr);
80 		ec = getnameinfo((struct sockaddr*)&c->addr, len,
81 		    hbuf, sizeof(hbuf),
82 		    sbuf, sizeof(sbuf),
83 		    NI_NUMERICHOST | NI_NUMERICSERV);
84 		if (ec != 0)
85 			fatal("getnameinfo: %s", gai_strerror(ec));
86 	}
87 
88 	if (vasprintf(&fmted, fmt, ap) == -1)
89 		fatal("vasprintf: %s", strerror(errno));
90 
91 	if (foreground)
92 		fprintf(stderr, "%s:%s %s\n", hbuf, sbuf, fmted);
93 	else {
94 		if (asprintf(&s, "%s:%s %s", hbuf, sbuf, fmted) == -1)
95 			fatal("asprintf: %s", strerror(errno));
96 		syslog(priority | LOG_DAEMON, "%s", s);
97 		free(s);
98 	}
99 
100 	free(fmted);
101 
102 	va_end(ap);
103 }
104 
105 /* strchr, but with a bound */
106 static char *
107 gmid_strnchr(char *s, int c, size_t len)
108 {
109 	size_t i;
110 
111 	for (i = 0; i < len; ++i)
112 		if (s[i] == c)
113 			return &s[i];
114 	return NULL;
115 }
116 
117 void
118 log_request(struct client *c, char *meta, size_t l)
119 {
120 	char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV], b[GEMINI_URL_LEN];
121 	char *t;
122 	size_t len;
123 	int ec;
124 
125 	len = sizeof(c->addr);
126 	ec = getnameinfo((struct sockaddr*)&c->addr, len,
127 	    hbuf, sizeof(hbuf),
128 	    sbuf, sizeof(sbuf),
129 	    NI_NUMERICHOST | NI_NUMERICSERV);
130 	if (ec != 0)
131 		fatal("getnameinfo: %s", gai_strerror(ec));
132 
133 	if (c->iri.schema != NULL) {
134 		/* serialize the IRI */
135 		strlcpy(b, c->iri.schema, sizeof(b));
136 		strlcat(b, "://", sizeof(b));
137 
138 		/* log the decoded host name, but if it was invalid
139 		 * use the raw one. */
140 		if (*c->domain != '\0')
141 			strlcat(b, c->domain, sizeof(b));
142 		else
143 			strlcat(b, c->iri.host, sizeof(b));
144 
145 		strlcat(b, "/", sizeof(b));
146 		strlcat(b, c->iri.path, sizeof(b)); /* TODO: sanitize UTF8 */
147 		if (*c->iri.query != '\0') {	    /* TODO: sanitize UTF8 */
148 			strlcat(b, "?", sizeof(b));
149 			strlcat(b, c->iri.query, sizeof(b));
150 		}
151 	} else {
152 		strlcpy(b, c->req, sizeof(b));
153 	}
154 
155 	if ((t = gmid_strnchr(meta, '\r', l)) == NULL)
156 		t = meta + len;
157 
158 	if (foreground)
159 		fprintf(stderr, "%s:%s GET %s %.*s\n", hbuf, sbuf, b,
160 		    (int)(t - meta), meta);
161 	else
162 		syslog(LOG_INFO | LOG_DAEMON, "%s:%s GET %s %.*s",
163 		    hbuf, sbuf, b, (int)(t - meta), meta);
164 }
165 
166 void
167 sig_handler(int sig)
168 {
169 	(void)sig;
170 }
171 
172 void
173 gen_certificate(const char *host, const char *certpath, const char *keypath)
174 {
175 	BIGNUM		e;
176 	EVP_PKEY	*pkey;
177 	RSA		*rsa;
178 	X509		*x509;
179 	X509_NAME	*name;
180 	FILE		*f;
181 	const char	*org = "gmid";
182 
183 	LOGN(NULL, "generating new certificate for %s (it could take a while)",
184 	    host);
185 
186 	if ((pkey = EVP_PKEY_new()) == NULL)
187                 fatal("couldn't create a new private key");
188 
189 	if ((rsa = RSA_new()) == NULL)
190 		fatal("could'nt generate rsa");
191 
192 	BN_init(&e);
193 	BN_set_word(&e, 17);
194 	if (!RSA_generate_key_ex(rsa, 4096, &e, NULL))
195 		fatal("couldn't generate a rsa key");
196 
197 	if (!EVP_PKEY_assign_RSA(pkey, rsa))
198 		fatal("couldn't assign the key");
199 
200 	if ((x509 = X509_new()) == NULL)
201 		fatal("couldn't generate the X509 certificate");
202 
203 	ASN1_INTEGER_set(X509_get_serialNumber(x509), 1);
204 	X509_gmtime_adj(X509_get_notBefore(x509), 0);
205 	X509_gmtime_adj(X509_get_notAfter(x509), 315360000L); /* 10 years */
206 
207 	if (!X509_set_pubkey(x509, pkey))
208 		fatal("couldn't set the public key");
209 
210 	name = X509_get_subject_name(x509);
211 	if (!X509_NAME_add_entry_by_txt(name, "O", MBSTRING_ASC, org, -1, -1, 0))
212 		fatal("couldn't add N to cert");
213 	if (!X509_NAME_add_entry_by_txt(name, "CN", MBSTRING_ASC, host, -1, -1, 0))
214 		fatal("couldn't add CN to cert");
215 	X509_set_issuer_name(x509, name);
216 
217 	if (!X509_sign(x509, pkey, EVP_sha256()))
218                 fatal("couldn't sign the certificate");
219 
220 	if ((f = fopen(keypath, "w")) == NULL)
221 		fatal("fopen(%s): %s", keypath, strerror(errno));
222 	if (!PEM_write_PrivateKey(f, pkey, NULL, NULL, 0, NULL, NULL))
223 		fatal("couldn't write private key");
224 	fclose(f);
225 
226 	if ((f = fopen(certpath, "w")) == NULL)
227 		fatal("fopen(%s): %s", certpath, strerror(errno));
228 	if (!PEM_write_X509(f, x509))
229 		fatal("couldn't write cert");
230 	fclose(f);
231 
232 	X509_free(x509);
233 	RSA_free(rsa);
234 }
235 
236 /* XXX: create recursively */
237 void
238 mkdirs(const char *path)
239 {
240 	if (mkdir(path, 0755) == -1 && errno != EEXIST)
241 		fatal("can't mkdir %s: %s", path, strerror(errno));
242 }
243 
244 /* $XDG_DATA_HOME/gmid */
245 char *
246 data_dir(void)
247 {
248 	const char *home, *xdg;
249 	char *t;
250 
251 	if ((xdg = getenv("XDG_DATA_HOME")) == NULL) {
252 		if ((home = getenv("HOME")) == NULL)
253 			errx(1, "XDG_DATA_HOME and HOME both empty");
254 		if (asprintf(&t, "%s/.local/share/gmid", home) == -1)
255 			err(1, "asprintf");
256 		mkdirs(t);
257 		return t;
258 	}
259 
260 	if (asprintf(&t, "%s/gmid", xdg) == -1)
261 		err(1, "asprintf");
262 	mkdirs(t);
263 	return t;
264 }
265 
266 void
267 load_local_cert(const char *hostname, const char *dir)
268 {
269 	char *cert, *key;
270 
271 	if (asprintf(&cert, "%s/%s.cert.pem", dir, hostname) == -1)
272 		errx(1, "asprintf");
273 	if (asprintf(&key, "%s/%s.key.pem", dir, hostname) == -1)
274 		errx(1, "asprintf");
275 
276 	if (access(cert, R_OK) == -1 || access(key, R_OK) == -1)
277 		gen_certificate(hostname, cert, key);
278 
279 	hosts[0].cert = cert;
280 	hosts[0].key = key;
281 	hosts[0].domain = hostname;
282 }
283 
284 void
285 load_vhosts(void)
286 {
287 	struct vhost *h;
288 
289 	for (h = hosts; h->domain != NULL; ++h) {
290 		if ((h->dirfd = open(h->dir, O_RDONLY | O_DIRECTORY)) == -1)
291 			fatal("open %s for domain %s", h->dir, h->domain);
292 	}
293 }
294 
295 int
296 make_socket(int port, int family)
297 {
298 	int sock, v;
299 	struct sockaddr_in addr4;
300 	struct sockaddr_in6 addr6;
301 	struct sockaddr *addr;
302 	socklen_t len;
303 
304         switch (family) {
305 	case AF_INET:
306 		bzero(&addr4, sizeof(addr4));
307 		addr4.sin_family = family;
308 		addr4.sin_port = htons(port);
309 		addr4.sin_addr.s_addr = INADDR_ANY;
310 		addr = (struct sockaddr*)&addr4;
311 		len = sizeof(addr4);
312 		break;
313 
314 	case AF_INET6:
315 		bzero(&addr6, sizeof(addr6));
316 		addr6.sin6_family = AF_INET6;
317 		addr6.sin6_port = htons(port);
318 		addr6.sin6_addr = in6addr_any;
319 		addr = (struct sockaddr*)&addr6;
320 		len = sizeof(addr6);
321 		break;
322 
323 	default:
324 		/* unreachable */
325 		abort();
326 	}
327 
328 	if ((sock = socket(family, SOCK_STREAM, 0)) == -1)
329 		fatal("socket: %s", strerror(errno));
330 
331 	v = 1;
332 	if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) == -1)
333 		fatal("setsockopt(SO_REUSEADDR): %s", strerror(errno));
334 
335 	v = 1;
336 	if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(v)) == -1)
337 		fatal("setsockopt(SO_REUSEPORT): %s", strerror(errno));
338 
339 	mark_nonblock(sock);
340 
341 	if (bind(sock, addr, len) == -1)
342 		fatal("bind: %s", strerror(errno));
343 
344 	if (listen(sock, 16) == -1)
345 		fatal("listen: %s", strerror(errno));
346 
347 	return sock;
348 }
349 
350 void
351 setup_tls(void)
352 {
353 	struct tls_config *tlsconf;
354 	struct vhost *h;
355 
356 	if ((tlsconf = tls_config_new()) == NULL)
357 		fatal("tls_config_new");
358 
359 	/* optionally accept client certs, but don't try to verify them */
360 	tls_config_verify_client_optional(tlsconf);
361 	tls_config_insecure_noverifycert(tlsconf);
362 
363 	if (tls_config_set_protocols(tlsconf, conf.protos) == -1)
364 		fatal("tls_config_set_protocols");
365 
366 	if ((ctx = tls_server()) == NULL)
367 		fatal("tls_server failure");
368 
369 	/* we need to set something, then we can add how many key we want */
370 	if (tls_config_set_keypair_file(tlsconf, hosts->cert, hosts->key))
371 		fatal("tls_config_set_keypair_file failed");
372 
373 	for (h = &hosts[1]; h->domain != NULL; ++h) {
374 		if (tls_config_add_keypair_file(tlsconf, h->cert, h->key) == -1)
375 			fatal("failed to load the keypair (%s, %s)",
376 			    h->cert, h->key);
377 	}
378 
379 	if (tls_configure(ctx, tlsconf) == -1)
380 		fatal("tls_configure: %s", tls_error(ctx));
381 }
382 
383 int
384 listener_main(void)
385 {
386 	int sock4, sock6;
387 
388 	load_default_mime(&conf.mime);
389 
390 	sock4 = make_socket(conf.port, AF_INET);
391 	sock6 = -1;
392 	if (conf.ipv6)
393 		sock6 = make_socket(conf.port, AF_INET6);
394 
395 	load_vhosts();
396 
397 	sandbox();
398 	loop(ctx, sock4, sock6);
399 
400 	return 0;
401 }
402 
403 void
404 init_config(void)
405 {
406 	size_t i;
407 
408 	bzero(hosts, sizeof(hosts));
409 	for (i = 0; i < HOSTSLEN; ++i)
410 		hosts[i].dirfd = -1;
411 
412 	conf.port = 1965;
413 	conf.ipv6 = 0;
414 	conf.protos = TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3;
415 
416 	init_mime(&conf.mime);
417 
418 	conf.chroot = NULL;
419 	conf.user = NULL;
420 }
421 
422 void
423 drop_priv(void)
424 {
425 	struct passwd *pw = NULL;
426 
427 	if (conf.chroot != NULL && conf.user == NULL)
428 		fatal("can't chroot without an user to switch to after.");
429 
430 	if (conf.user != NULL) {
431 		if ((pw = getpwnam(conf.user)) == NULL)
432 			fatal("can't find user %s", conf.user);
433 	}
434 
435 	if (conf.chroot != NULL) {
436 		if (chroot(conf.chroot) != 0 || chdir("/") != 0)
437 			fatal("%s: %s", conf.chroot, strerror(errno));
438 	}
439 
440 	if (pw != NULL) {
441 		if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1)
442 			fatal("setresuid(%d): %s", pw->pw_uid,
443 			    strerror(errno));
444 	}
445 
446 	if (getuid() == 0)
447 		LOGW(NULL, "%s",
448 		    "not a good idea to run a network daemon as root");
449 }
450 
451 void
452 usage(const char *me)
453 {
454 	fprintf(stderr,
455 	    "USAGE: %s [-fn] [-c config] | [-6h] [-d certs-dir] [-H host]"
456 	    "       [-p port] [-x cgi] [dir]",
457 	    me);
458 }
459 
460 int
461 main(int argc, char **argv)
462 {
463 	int ch, p[2];
464 	const char *config_path = NULL, *certs_dir = NULL, *hostname = NULL;
465 	int conftest = 0, configless = 0;
466 
467 	init_config();
468 
469 	while ((ch = getopt(argc, argv, "6c:d:fH:hnp:vx:")) != -1) {
470 		switch (ch) {
471 		case '6':
472 			conf.ipv6 = 1;
473 			configless = 1;
474 			break;
475 
476 		case 'c':
477 			config_path = optarg;
478 			break;
479 
480 		case 'd':
481 			certs_dir = optarg;
482 			configless = 1;
483 			break;
484 
485 		case 'f':
486 			foreground = 1;
487 			break;
488 
489 		case 'H':
490 			hostname = optarg;
491 			configless = 1;
492 			break;
493 
494 		case 'h':
495 			usage(*argv);
496 			return 0;
497 
498 		case 'n':
499 			conftest = 1;
500 			break;
501 
502 		case 'p':
503 			conf.port = parse_portno(optarg);
504 			configless = 1;
505 			break;
506 
507 		case 'v':
508 			verbose = 1;
509 			break;
510 
511 		case 'x':
512 			/* drop the starting / (if any) */
513 			if (*optarg == '/')
514 				optarg++;
515 			hosts[0].cgi = optarg;
516 			configless = 1;
517 			break;
518 
519 		default:
520 			usage(*argv);
521 			return 1;
522 		}
523 	}
524 	argc -= optind;
525 	argv += optind;
526 
527 	if (config_path != NULL) {
528 		if (argc > 0 || configless)
529 			fatal("can't specify options is config mode.");
530 
531 		parse_conf(config_path);
532 	} else {
533 		configless = 1;
534 		foreground = 1;
535 
536 		if (hostname == NULL)
537 			hostname = "localhost";
538 		if (certs_dir == NULL)
539 			certs_dir = data_dir();
540 		load_local_cert(hostname, certs_dir);
541 
542 		hosts[0].domain = "*";
543 		hosts[0].locations[0].auto_index = 1;
544 		hosts[0].locations[0].match = "*";
545 
546                 switch (argc) {
547 		case 0:
548 			hosts[0].dir = ".";
549 			break;
550 		case 1:
551 			hosts[0].dir = argv[0];
552 			break;
553 		default:
554 			usage(getprogname());
555 			return 1;
556 		}
557 
558 		LOGN(NULL, "serving %s on port %d", hosts[0].dir, conf.port);
559 	}
560 
561 	if (conftest) {
562 		puts("config OK");
563 		return 0;
564 	}
565 
566 	/* setup tls before dropping privileges: we don't want user
567 	 * to put private certs inside the chroot. */
568 	setup_tls();
569 	drop_priv();
570 
571 	signal(SIGPIPE, SIG_IGN);
572 	signal(SIGCHLD, SIG_IGN);
573 
574 #ifdef SIGINFO
575 	signal(SIGINFO, sig_handler);
576 #endif
577 	signal(SIGUSR2, sig_handler);
578 	signal(SIGHUP, SIG_IGN);
579 
580 	if (!foreground && !configless) {
581 		if (daemon(1, 1) == -1)
582 			fatal("daemon: %s", strerror(errno));
583 	}
584 
585 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, p) == -1)
586 		fatal("socketpair: %s", strerror(errno));
587 
588 	switch (fork()) {
589 	case -1:
590 		fatal("fork: %s", strerror(errno));
591 
592 	case 0:			/* child */
593 		close(p[0]);
594 		exfd = p[1];
595 		listener_main();
596 		_exit(0);
597 
598 	default:		/* parent */
599 		close(p[1]);
600 		return executor_main(p[0]);
601 	}
602 }