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Date:: Mon Jun 26 09:44:46 2023 UTC
Message:: call getnameinfo() only once per request
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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 <locale.h>
25 #include <libgen.h>
26 #include <limits.h>
27 #include <grp.h>
28 #include <pwd.h>
29 #include <signal.h>
30 #include <string.h>
31 #include <syslog.h>
32 
33 #include "log.h"
34 #include "proc.h"
35 
36 #ifndef nitems
37 #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
38 #endif
39 
40 static int main_configure(struct conf *);
41 static void main_configure_done(struct conf *);
42 static void main_reload(struct conf *);
43 static void main_sig_handler(int, short, void *);
44 static int main_dispatch_server(int, struct privsep_proc *, struct imsg *);
45 static int main_dispatch_crypto(int, struct privsep_proc *, struct imsg *);
46 static int main_dispatch_logger(int, struct privsep_proc *, struct imsg *);
47 static void __dead main_shutdown(struct conf *);
48 static void main_print_conf(struct conf *);
49 
50 static struct privsep_proc procs[] = {
51 	{ "server",	PROC_SERVER,	main_dispatch_server, server },
52 	{ "crypto",	PROC_CRYPTO,	main_dispatch_crypto, crypto },
53 	{ "logger",	PROC_LOGGER,	main_dispatch_logger, logger },
54 };
55 
56 static const char	*opts = "c:D:fI:hnP:T:U:VvX:";
57 
58 static const struct option longopts[] = {
59 	{"help",	no_argument,		NULL,	'h'},
60 	{"version",	no_argument,		NULL,	'V'},
61 	{NULL,		0,			NULL,	0},
62 };
63 
64 int sock4, sock6;
65 int privsep_process;
66 int pidfd = -1;
67 
68 int debug, verbose;
69 
70 const char *config_path = "/etc/gmid.conf";
71 const char *pidfile;
72 
73 static void
74 usage(void)
75 {
76 	fprintf(stderr,
77 	    "Version: " GMID_STRING "\n"
78 	    "Usage: %s [-fnv] [-c config] [-D macro=value] [-P pidfile]\n",
79 	    getprogname());
80 }
81 
82 /* used by the server process, defined here so gg can provide its own impl. */
83 void
84 log_request(struct client *c, char *meta, size_t l)
85 {
86 	struct conf *conf = c->conf;
87 	char b[GEMINI_URL_LEN];
88 	char *fmted;
89 	const char *t;
90 	int ec;
91 
92 	if (c->iri.schema != NULL) {
93 		/* serialize the IRI */
94 		strlcpy(b, c->iri.schema, sizeof(b));
95 		strlcat(b, "://", sizeof(b));
96 
97 		/* log the decoded host name, but if it was invalid
98 		 * use the raw one. */
99 		if (*c->domain != '\0')
100 			strlcat(b, c->domain, sizeof(b));
101 		else
102 			strlcat(b, c->iri.host, sizeof(b));
103 
104 		if (*c->iri.path != '/')
105 			strlcat(b, "/", sizeof(b));
106 		strlcat(b, c->iri.path, sizeof(b)); /* TODO: sanitize UTF8 */
107 		if (*c->iri.query != '\0') {	    /* TODO: sanitize UTF8 */
108 			strlcat(b, "?", sizeof(b));
109 			strlcat(b, c->iri.query, sizeof(b));
110 		}
111 	} else {
112 		if ((t = c->req) == NULL)
113 			t = "";
114 		strlcpy(b, t, sizeof(b));
115 	}
116 
117 	if ((t = memchr(meta, '\r', l)) == NULL)
118 		t = meta + l;
119 
120 	ec = asprintf(&fmted, "%s:%s GET %s %.*s", c->rhost, c->rserv, b,
121 	    (int)(t-meta), meta);
122 	if (ec == -1)
123 		fatal("asprintf");
124 
125 	proc_compose(conf->ps, PROC_LOGGER, IMSG_LOG_REQUEST,
126 	    fmted, ec + 1);
127 
128 	free(fmted);
129 }
130 
131 static int
132 write_pidfile(const char *pidfile)
133 {
134 	struct flock	lock;
135 	int		fd;
136 
137 	if (pidfile == NULL)
138 		return -1;
139 
140 	if ((fd = open(pidfile, O_WRONLY|O_CREAT|O_CLOEXEC, 0600)) == -1)
141 		fatal("can't open pidfile %s", pidfile);
142 
143 	lock.l_start = 0;
144 	lock.l_len = 0;
145 	lock.l_type = F_WRLCK;
146 	lock.l_whence = SEEK_SET;
147 
148 	if (fcntl(fd, F_SETLK, &lock) == -1)
149 		fatalx("can't lock %s, gmid is already running?", pidfile);
150 
151 	if (ftruncate(fd, 0) == -1)
152 		fatal("ftruncate %s", pidfile);
153 
154 	dprintf(fd, "%d\n", getpid());
155 
156 	return fd;
157 }
158 
159 int
160 main(int argc, char **argv)
161 {
162 	struct conf *conf;
163 	struct privsep *ps;
164 	const char *errstr, *title = NULL;
165 	const char *user = NULL, *chroot = NULL;
166 	size_t i;
167 	int ch, conftest = 0;
168 	int proc_instance = 0;
169 	int proc_id = PROC_PARENT;
170 	int argc0 = argc;
171 
172 	setlocale(LC_CTYPE, "");
173 
174 	/* log to stderr until daemonized */
175 	log_init(1, LOG_DAEMON);
176 
177 	while ((ch = getopt_long(argc, argv, opts, longopts, NULL)) != -1) {
178 		switch (ch) {
179 		case 'c':
180 			config_path = absolutify_path(optarg);
181 			break;
182 		case 'D':
183 			if (cmdline_symset(optarg) == -1)
184 				fatalx("could not parse macro definition: %s",
185 				    optarg);
186 			break;
187 		case 'f':
188 			debug = 1;
189 			break;
190 		case 'h':
191 			usage();
192 			return 0;
193 		case 'I':
194 			proc_instance = strtonum(optarg, 0, PROC_MAX_INSTANCES,
195 			    &errstr);
196 			if (errstr != NULL)
197 				fatalx("invalid process instance");
198 			break;
199 		case 'n':
200 			conftest++;
201 			break;
202 		case 'P':
203 			pidfile = absolutify_path(optarg);
204 			break;
205 		case 'T':
206 			title = optarg;
207 			proc_id = proc_getid(procs, nitems(procs), title);
208 			if (proc_id == PROC_MAX)
209 				fatalx("invalid process name");
210 			break;
211 		case 'U':
212 			user = optarg;
213 			break;
214 		case 'V':
215 			puts("Version: " GMID_STRING);
216 			return 0;
217 		case 'v':
218 			verbose = 1;
219 			break;
220 		case 'X':
221 			chroot = optarg;
222 			break;
223 		default:
224 			usage();
225 			return 1;
226 		}
227 	}
228 
229 	if (argc - optind != 0)
230 		usage();
231 
232 	conf = config_new();
233 
234 	/*
235 	 * Only the parent loads the config, the others get user and
236 	 * chroot via flags and the rest via imsg.
237 	 */
238 	if (proc_id == PROC_PARENT) {
239 		if (parse_conf(conf, config_path) == -1)
240 			fatalx("failed to load configuration file");
241 		if (*conf->chroot != '\0' && *conf->user == '\0')
242 			fatalx("can't chroot without a user to switch to.");
243 	} else {
244 		if (user)
245 			strlcpy(conf->user, user, sizeof(conf->user));
246 		if (chroot)
247 			strlcpy(conf->chroot, chroot, sizeof(conf->chroot));
248 	}
249 
250 	if (conftest) {
251 		fprintf(stderr, "config OK\n");
252 		if (conftest > 1)
253 			main_print_conf(conf);
254 		return 0;
255 	}
256 
257 	if ((ps = calloc(1, sizeof(*ps))) == NULL)
258 		fatal("calloc");
259 	ps->ps_env = conf;
260 	conf->ps = ps;
261 	if (*conf->user) {
262 		if (geteuid())
263 			fatalx("need root privileges");
264 		if ((ps->ps_pw = getpwnam(conf->user)) == NULL)
265 			fatalx("unknown user %s", conf->user);
266 		if (*conf->chroot == '\0')
267 			strlcpy(conf->chroot, ps->ps_pw->pw_dir,
268 			    sizeof(conf->chroot));
269 	}
270 
271 	ps->ps_instances[PROC_SERVER] = conf->prefork;
272 	ps->ps_instance = proc_instance;
273 	if (title != NULL)
274 		ps->ps_title[proc_id] = title;
275 
276 	if (*conf->chroot != '\0') {
277 		for (i = 0; i < nitems(procs); ++i)
278 			procs[i].p_chroot = conf->chroot;
279 	}
280 
281 	log_init(debug, LOG_DAEMON);
282 	log_setverbose(verbose);
283 	if (title != NULL)
284 		log_procinit(title);
285 
286 	/* only the parent returns */
287 	proc_init(ps, procs, nitems(procs), debug, argc0, argv, proc_id);
288 
289 	log_procinit("main");
290 	if (!debug && daemon(0, 0) == -1)
291 		fatal("daemon");
292 
293 	pidfd = write_pidfile(pidfile);
294 
295 	sandbox_main_process();
296 
297 	event_init();
298 
299 	signal(SIGPIPE, SIG_IGN);
300 
301 	signal_set(&ps->ps_evsigint, SIGINT, main_sig_handler, ps);
302 	signal_set(&ps->ps_evsigterm, SIGTERM, main_sig_handler, ps);
303 	signal_set(&ps->ps_evsigchld, SIGCHLD, main_sig_handler, ps);
304 	signal_set(&ps->ps_evsighup, SIGHUP, main_sig_handler, ps);
305 
306 	signal_add(&ps->ps_evsigint, NULL);
307 	signal_add(&ps->ps_evsigterm, NULL);
308 	signal_add(&ps->ps_evsigchld, NULL);
309 	signal_add(&ps->ps_evsighup, NULL);
310 
311 	proc_connect(ps);
312 
313 	if (main_configure(conf) == -1)
314 		fatal("configuration failed");
315 
316 	event_dispatch();
317 	main_shutdown(conf);
318 	/* NOTREACHED */
319 	return 0;
320 }
321 
322 static int
323 main_configure(struct conf *conf)
324 {
325 	struct privsep	*ps = conf->ps;
326 
327 	conf->reload = conf->prefork + 1; /* servers, crypto */
328 
329 	if (proc_compose(ps, PROC_SERVER, IMSG_RECONF_START, NULL, 0) == -1)
330 		return -1;
331 	if (proc_compose(ps, PROC_CRYPTO, IMSG_RECONF_START, NULL, 0) == -1)
332 		return -1;
333 
334 	if (config_send(conf) == -1)
335 		return -1;
336 
337 	if (proc_compose(ps, PROC_SERVER, IMSG_RECONF_END, NULL, 0) == -1)
338 		return -1;
339 	if (proc_compose(ps, PROC_CRYPTO, IMSG_RECONF_END, NULL, 0) == -1)
340 		return -1;
341 
342 	return 0;
343 }
344 
345 static void
346 main_configure_done(struct conf *conf)
347 {
348 	if (conf->reload == 0) {
349 		log_warnx("configuration already done");
350 		return;
351 	}
352 
353 	conf->reload--;
354 	/* send IMSG_CTL_START? */
355 }
356 
357 static void
358 main_reload(struct conf *conf)
359 {
360 	if (conf->reload) {
361 		log_debug("%s: already in progress: %d pending",
362 		    __func__, conf->reload);
363 		return;
364 	}
365 
366 	log_debug("%s: config file %s", __func__, config_path);
367 	config_purge(conf);
368 
369 	if (parse_conf(conf, config_path) == -1) {
370 		log_warnx("failed to parse the config");
371 		return;
372 	}
373 
374 	main_configure(conf);
375 }
376 
377 static void
378 main_sig_handler(int sig, short ev, void *arg)
379 {
380 	struct privsep	*ps = arg;
381 
382 	/*
383 	 * Normal signal handler rules don't apply here because libevent
384 	 * decouples for us.
385 	 */
386 
387 	switch (sig) {
388 	case SIGHUP:
389 		if (privsep_process != PROC_PARENT)
390 			return;
391 		log_info("reload requested with SIGHUP");
392 		main_reload(ps->ps_env);
393 		break;
394 	case SIGCHLD:
395 		log_warnx("one child died, quitting");
396 		/* fallthrough */
397 	case SIGTERM:
398 	case SIGINT:
399 		main_shutdown(ps->ps_env);
400 		break;
401 	default:
402 		fatalx("unexpected signal %d", sig);
403 	}
404 }
405 
406 static int
407 main_dispatch_server(int fd, struct privsep_proc *p, struct imsg *imsg)
408 {
409 	struct privsep	*ps = p->p_ps;
410 	struct conf	*conf = ps->ps_env;
411 
412 	switch (imsg->hdr.type) {
413 	case IMSG_RECONF_DONE:
414 		main_configure_done(conf);
415 		break;
416 	default:
417 		return -1;
418 	}
419 
420 	return 0;
421 }
422 
423 static int
424 main_dispatch_crypto(int fd, struct privsep_proc *p, struct imsg *imsg)
425 {
426 	struct privsep	*ps = p->p_ps;
427 	struct conf	*conf = ps->ps_env;
428 
429 	switch (imsg->hdr.type) {
430 	case IMSG_RECONF_DONE:
431 		main_configure_done(conf);
432 		break;
433 	default:
434 		return -1;
435 	}
436 
437 	return 0;
438 }
439 
440 static int
441 main_dispatch_logger(int fd, struct privsep_proc *p, struct imsg *imsg)
442 {
443 	struct privsep	*ps = p->p_ps;
444 	struct conf	*conf = ps->ps_env;
445 
446 	switch (imsg->hdr.type) {
447 	case IMSG_RECONF_DONE:
448 		main_configure_done(conf);
449 		break;
450 	default:
451 		return -1;
452 	}
453 
454 	return 0;
455 }
456 
457 static void __dead
458 main_shutdown(struct conf *conf)
459 {
460 	proc_kill(conf->ps);
461 	config_purge(conf);
462 	free(conf->ps);
463 	/* free(conf); */
464 
465 	log_info("parent terminating, pid %d", getpid());
466 
467 	if (pidfd != -1)
468 		close(pidfd);
469 
470 	exit(0);
471 }
472 
473 static void
474 main_print_conf(struct conf *conf)
475 {
476 	struct vhost	*h;
477 	/* struct location	*l; */
478 	/* struct envlist	*e; */
479 	/* struct alist	*a; */
480 
481 	if (*conf->chroot != '\0')
482 		printf("chroot \"%s\"\n", conf->chroot);
483 	/* XXX: defined mimes? */
484 	printf("prefork %d\n", conf->prefork);
485 	/* XXX: protocols? */
486 	if (*conf->user != '\0')
487 		printf("user \"%s\"\n", conf->user);
488 
489 	TAILQ_FOREACH(h, &conf->hosts, vhosts) {
490 		printf("\nserver \"%s\" {\n", h->domain);
491 		printf("	cert \"%s\"\n", h->cert);
492 		printf("	key \"%s\"\n", h->key);
493 		/* TODO: print locations... */
494 		printf("}\n");
495 	}
496 }