1 /*
2  * Copyright (c) 2016-2019, 2020-2021 Tracey Emery <tracey@traceyemery.net>
3  * Copyright (c) 2004, 2005 Esben Norby <norby@openbsd.org>
4  * Copyright (c) 2004 Ryan McBride <mcbride@openbsd.org>
5  * Copyright (c) 2002, 2003, 2004 Henning Brauer <henning@openbsd.org>
6  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
7  * Copyright (c) 2001 Daniel Hartmeier.  All rights reserved.
8  * Copyright (c) 2001 Theo de Raadt.  All rights reserved.
9  *
10  * Permission to use, copy, modify, and distribute this software for any
11  * purpose with or without fee is hereby granted, provided that the above
12  * copyright notice and this permission notice appear in all copies.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
15  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
16  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
17  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
18  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
19  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
20  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21  */
22 
23 %{
24 #include <sys/ioctl.h>
25 #include <sys/types.h>
26 #include <sys/queue.h>
27 #include <sys/socket.h>
28 #include <sys/stat.h>
29 
30 #include <net/if.h>
31 #include <netinet/in.h>
32 
33 #include <arpa/inet.h>
34 
35 #include <ctype.h>
36 #include <err.h>
37 #include <errno.h>
38 #include <event.h>
39 #include <ifaddrs.h>
40 #include <imsg.h>
41 #include <limits.h>
42 #include <netdb.h>
43 #include <stdarg.h>
44 #include <stdlib.h>
45 #include <stdio.h>
46 #include <string.h>
47 #include <syslog.h>
48 #include <unistd.h>
49 
50 #include "proc.h"
51 #include "gotwebd.h"
52 #include "got_sockaddr.h"
53 
54 TAILQ_HEAD(files, file)		 files = TAILQ_HEAD_INITIALIZER(files);
55 static struct file {
56 	TAILQ_ENTRY(file)	 entry;
57 	FILE			*stream;
58 	char			*name;
59 	int			 lineno;
60 	int			 errors;
61 } *file;
62 struct file	*newfile(const char *, int);
63 static void	 closefile(struct file *);
64 int		 check_file_secrecy(int, const char *);
65 int		 yyparse(void);
66 int		 yylex(void);
67 int		 yyerror(const char *, ...)
68     __attribute__((__format__ (printf, 1, 2)))
69     __attribute__((__nonnull__ (1)));
70 int		 kw_cmp(const void *, const void *);
71 int		 lookup(char *);
72 int		 lgetc(int);
73 int		 lungetc(int);
74 int		 findeol(void);
75 
76 TAILQ_HEAD(symhead, sym)	 symhead = TAILQ_HEAD_INITIALIZER(symhead);
77 struct sym {
78 	TAILQ_ENTRY(sym)	 entry;
79 	int			 used;
80 	int			 persist;
81 	char			*nam;
82 	char			*val;
83 };
84 
85 int	 symset(const char *, const char *, int);
86 char	*symget(const char *);
87 
88 static int		 errors;
89 
90 static struct gotwebd		*gotwebd;
91 static struct server		*new_srv;
92 static struct server		*conf_new_server(const char *);
93 int				 getservice(const char *);
94 int				 n;
95 
96 int		 get_addrs(const char *, struct server *, in_port_t);
97 int		 addr_dup_check(struct addresslist *, struct address *,
98 		    const char *, const char *);
99 int		 add_addr(struct server *, struct address *);
100 struct address	*host_v4(const char *);
101 struct address	*host_v6(const char *);
102 int		 host_dns(const char *, struct server *,
103 		    int, in_port_t, const char *, int);
104 int		 host_if(const char *, struct server *,
105 		    int, in_port_t, const char *, int);
106 int		 host(const char *, struct server *,
107 		    int, in_port_t, const char *, int);
108 int		 is_if_in_group(const char *, const char *);
109 
110 typedef struct {
111 	union {
112 		long long	 number;
113 		char		*string;
114 		in_port_t	 port;
115 	} v;
116 	int lineno;
117 } YYSTYPE;
118 
119 %}
120 
121 %token	LISTEN WWW_PATH MAX_REPOS SITE_NAME SITE_OWNER SITE_LINK LOGO
122 %token	LOGO_URL SHOW_REPO_OWNER SHOW_REPO_AGE SHOW_REPO_DESCRIPTION
123 %token	MAX_REPOS_DISPLAY REPOS_PATH MAX_COMMITS_DISPLAY ON ERROR
124 %token	SHOW_SITE_OWNER SHOW_REPO_CLONEURL PORT PREFORK
125 %token	UNIX_SOCKET UNIX_SOCKET_NAME SERVER CHROOT CUSTOM_CSS
126 
127 %token	<v.string>	STRING
128 %type	<v.port>	fcgiport
129 %token	<v.number>	NUMBER
130 %type	<v.number>	boolean
131 
132 %%
133 
134 grammar		: /* empty */
135 		| grammar '\n'
136 		| grammar varset '\n'
137 		| grammar main '\n'
138 		| grammar server '\n'
139 		| grammar error '\n'		{ file->errors++; }
140 		;
141 
142 varset		: STRING '=' STRING	{
143 			char *s = $1;
144 			while (*s++) {
145 				if (isspace((unsigned char)*s)) {
146 					yyerror("macro name cannot contain "
147 					    "whitespace");
148 					free($1);
149 					free($3);
150 					YYERROR;
151 				}
152 			}
153 			if (symset($1, $3, 0) == -1)
154 				fatal("cannot store variable");
155 			free($1);
156 			free($3);
157 		}
158 		;
159 
160 boolean		: STRING {
161 			if (strcasecmp($1, "1") == 0 ||
162 			    strcasecmp($1, "yes") == 0 ||
163 			    strcasecmp($1, "on") == 0)
164 				$$ = 1;
165 			else if (strcasecmp($1, "0") == 0 ||
166 			    strcasecmp($1, "off") == 0 ||
167 			    strcasecmp($1, "no") == 0)
168 				$$ = 0;
169 			else {
170 				yyerror("invalid boolean value '%s'", $1);
171 				free($1);
172 				YYERROR;
173 			}
174 			free($1);
175 		}
176 		| ON { $$ = 1; }
177 		| NUMBER { $$ = $1; }
178 		;
179 
180 fcgiport	: PORT NUMBER {
181 			if ($2 <= 0 || $2 > (int)USHRT_MAX) {
182 				yyerror("invalid port: %lld", $2);
183 				YYERROR;
184 			}
185 			$$ = $2;
186 		}
187 		| PORT STRING {
188 			int	 val;
189 
190 			if ((val = getservice($2)) == -1) {
191 				yyerror("invalid port: %s", $2);
192 				free($2);
193 				YYERROR;
194 			}
195 			free($2);
196 
197 			$$ = val;
198 		}
199 		;
200 
201 main		: PREFORK NUMBER {
202 			gotwebd->prefork_gotwebd = $2;
203 		}
204 		| CHROOT STRING {
205 			n = strlcpy(gotwebd->httpd_chroot, $2,
206 			    sizeof(gotwebd->httpd_chroot));
207 			if (n >= sizeof(gotwebd->httpd_chroot)) {
208 				yyerror("%s: httpd_chroot truncated", __func__);
209 				free($2);
210 				YYERROR;
211 			}
212 			free($2);
213 		}
214 		| UNIX_SOCKET boolean {
215 			gotwebd->unix_socket = $2;
216 		}
217 		| UNIX_SOCKET_NAME STRING {
218 			n = snprintf(gotwebd->unix_socket_name,
219 			    sizeof(gotwebd->unix_socket_name), "%s%s",
220 			    strlen(gotwebd->httpd_chroot) ?
221 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $2);
222 			if (n < 0 ||
223 			    (size_t)n >= sizeof(gotwebd->unix_socket_name)) {
224 				yyerror("%s: unix_socket_name truncated",
225 				    __func__);
226 				free($2);
227 				YYERROR;
228 			}
229 			free($2);
230 		}
231 		;
232 
233 server		: SERVER STRING {
234 			struct server *srv;
235 
236 			TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
237 				if (strcmp(srv->name, $2) == 0) {
238 					yyerror("server name exists '%s'", $2);
239 					free($2);
240 					YYERROR;
241 				}
242 			}
243 
244 			new_srv = conf_new_server($2);
245 			log_debug("adding server %s", $2);
246 			free($2);
247 		}
248 		| SERVER STRING {
249 			struct server *srv;
250 
251 			TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
252 				if (strcmp(srv->name, $2) == 0) {
253 					yyerror("server name exists '%s'", $2);
254 					free($2);
255 					YYERROR;
256 				}
257 			}
258 
259 			new_srv = conf_new_server($2);
260 			log_debug("adding server %s", $2);
261 			free($2);
262 		} '{' optnl serveropts2 '}' {
263 		}
264 		;
265 
266 serveropts1	: REPOS_PATH STRING {
267 			n = strlcpy(new_srv->repos_path, $2,
268 			    sizeof(new_srv->repos_path));
269 			if (n >= sizeof(new_srv->repos_path)) {
270 				yyerror("%s: repos_path truncated", __func__);
271 				free($2);
272 				YYERROR;
273 			}
274 			free($2);
275 		}
276 		| SITE_NAME STRING {
277 			n = strlcpy(new_srv->site_name, $2,
278 			    sizeof(new_srv->site_name));
279 			if (n >= sizeof(new_srv->site_name)) {
280 				yyerror("%s: site_name truncated", __func__);
281 				free($2);
282 				YYERROR;
283 			}
284 			free($2);
285 		}
286 		| SITE_OWNER STRING {
287 			n = strlcpy(new_srv->site_owner, $2,
288 			    sizeof(new_srv->site_owner));
289 			if (n >= sizeof(new_srv->site_owner)) {
290 				yyerror("%s: site_owner truncated", __func__);
291 				free($2);
292 				YYERROR;
293 			}
294 			free($2);
295 		}
296 		| SITE_LINK STRING {
297 			n = strlcpy(new_srv->site_link, $2,
298 			    sizeof(new_srv->site_link));
299 			if (n >= sizeof(new_srv->site_link)) {
300 				yyerror("%s: site_link truncated", __func__);
301 				free($2);
302 				YYERROR;
303 			}
304 			free($2);
305 		}
306 		| LOGO STRING {
307 			n = strlcpy(new_srv->logo, $2, sizeof(new_srv->logo));
308 			if (n >= sizeof(new_srv->logo)) {
309 				yyerror("%s: logo truncated", __func__);
310 				free($2);
311 				YYERROR;
312 			}
313 			free($2);
314 		}
315 		| LOGO_URL STRING {
316 			n = strlcpy(new_srv->logo_url, $2,
317 			    sizeof(new_srv->logo_url));
318 			if (n >= sizeof(new_srv->logo_url)) {
319 				yyerror("%s: logo_url truncated", __func__);
320 				free($2);
321 				YYERROR;
322 			}
323 			free($2);
324 		}
325 		| CUSTOM_CSS STRING {
326 			n = strlcpy(new_srv->custom_css, $2,
327 			    sizeof(new_srv->custom_css));
328 			if (n >= sizeof(new_srv->custom_css)) {
329 				yyerror("%s: custom_css truncated", __func__);
330 				free($2);
331 				YYERROR;
332 			}
333 			free($2);
334 		}
335 		| LISTEN ON STRING fcgiport {
336 			if (get_addrs($3, new_srv, $4) == -1) {
337 				yyerror("could not get addrs");
338 				YYERROR;
339 			}
340 			new_srv->fcgi_socket = 1;
341 		}
342 		| MAX_REPOS NUMBER {
343 			if ($2 > 0)
344 				new_srv->max_repos = $2;
345 		}
346 		| SHOW_SITE_OWNER boolean {
347 			new_srv->show_site_owner = $2;
348 		}
349 		| SHOW_REPO_OWNER boolean {
350 			new_srv->show_repo_owner = $2;
351 		}
352 		| SHOW_REPO_AGE boolean {
353 			new_srv->show_repo_age = $2;
354 		}
355 		| SHOW_REPO_DESCRIPTION boolean {
356 			new_srv->show_repo_description = $2;
357 		}
358 		| SHOW_REPO_CLONEURL boolean {
359 			new_srv->show_repo_cloneurl = $2;
360 		}
361 		| MAX_REPOS_DISPLAY NUMBER {
362 				new_srv->max_repos_display = $2;
363 		}
364 		| MAX_COMMITS_DISPLAY NUMBER {
365 			if ($2 > 0)
366 				new_srv->max_commits_display = $2;
367 		}
368 		| UNIX_SOCKET boolean {
369 			new_srv->unix_socket = $2;
370 		}
371 		| UNIX_SOCKET_NAME STRING {
372 			n = snprintf(new_srv->unix_socket_name,
373 			    sizeof(new_srv->unix_socket_name), "%s%s",
374 			    strlen(gotwebd->httpd_chroot) ?
375 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $2);
376 			if (n < 0 ||
377 			    (size_t)n >= sizeof(new_srv->unix_socket_name)) {
378 				yyerror("%s: unix_socket_name truncated",
379 				    __func__);
380 				free($2);
381 				YYERROR;
382 			}
383 			free($2);
384 		}
385 		;
386 
387 serveropts2	: serveropts2 serveropts1 nl
388 		| serveropts1 optnl
389 		;
390 
391 nl		: '\n' optnl
392 		;
393 
394 optnl		: '\n' optnl		/* zero or more newlines */
395 		| /* empty */
396 		;
397 
398 %%
399 
400 struct keywords {
401 	const char	*k_name;
402 	int		 k_val;
403 };
404 
405 int
406 yyerror(const char *fmt, ...)
407 {
408 	va_list ap;
409 	char *msg;
410 
411 	file->errors++;
412 	va_start(ap, fmt);
413 	if (vasprintf(&msg, fmt, ap) == -1)
414 		fatalx("yyerror vasprintf");
415 	va_end(ap);
416 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
417 	free(msg);
418 	return (0);
419 }
420 
421 int
422 kw_cmp(const void *k, const void *e)
423 {
424 	return (strcmp(k, ((const struct keywords *)e)->k_name));
425 }
426 
427 int
428 lookup(char *s)
429 {
430 	/* This has to be sorted always. */
431 	static const struct keywords keywords[] = {
432 		{ "chroot",			CHROOT },
433 		{ "custom_css",			CUSTOM_CSS },
434 		{ "listen",			LISTEN },
435 		{ "logo",			LOGO },
436 		{ "logo_url"	,		LOGO_URL },
437 		{ "max_commits_display",	MAX_COMMITS_DISPLAY },
438 		{ "max_repos",			MAX_REPOS },
439 		{ "max_repos_display",		MAX_REPOS_DISPLAY },
440 		{ "on",				ON },
441 		{ "port",			PORT },
442 		{ "prefork",			PREFORK },
443 		{ "repos_path",			REPOS_PATH },
444 		{ "server",			SERVER },
445 		{ "show_repo_age",		SHOW_REPO_AGE },
446 		{ "show_repo_cloneurl",		SHOW_REPO_CLONEURL },
447 		{ "show_repo_description",	SHOW_REPO_DESCRIPTION },
448 		{ "show_repo_owner",		SHOW_REPO_OWNER },
449 		{ "show_site_owner",		SHOW_SITE_OWNER },
450 		{ "site_link",			SITE_LINK },
451 		{ "site_name",			SITE_NAME },
452 		{ "site_owner",			SITE_OWNER },
453 		{ "unix_socket",		UNIX_SOCKET },
454 		{ "unix_socket_name",		UNIX_SOCKET_NAME },
455 	};
456 	const struct keywords *p;
457 
458 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
459 	    sizeof(keywords[0]), kw_cmp);
460 
461 	if (p)
462 		return (p->k_val);
463 	else
464 		return (STRING);
465 }
466 
467 #define MAXPUSHBACK	128
468 
469 unsigned char *parsebuf;
470 int parseindex;
471 unsigned char pushback_buffer[MAXPUSHBACK];
472 int pushback_index = 0;
473 
474 int
475 lgetc(int quotec)
476 {
477 	int c, next;
478 
479 	if (parsebuf) {
480 		/* Read character from the parsebuffer instead of input. */
481 		if (parseindex >= 0) {
482 			c = parsebuf[parseindex++];
483 			if (c != '\0')
484 				return (c);
485 			parsebuf = NULL;
486 		} else
487 			parseindex++;
488 	}
489 
490 	if (pushback_index)
491 		return (pushback_buffer[--pushback_index]);
492 
493 	if (quotec) {
494 		c = getc(file->stream);
495 		if (c == EOF)
496 			yyerror("reached end of file while parsing "
497 			    "quoted string");
498 		return (c);
499 	}
500 
501 	c = getc(file->stream);
502 	while (c == '\\') {
503 		next = getc(file->stream);
504 		if (next != '\n') {
505 			c = next;
506 			break;
507 		}
508 		yylval.lineno = file->lineno;
509 		file->lineno++;
510 		c = getc(file->stream);
511 	}
512 
513 	return (c);
514 }
515 
516 int
517 lungetc(int c)
518 {
519 	if (c == EOF)
520 		return (EOF);
521 	if (parsebuf) {
522 		parseindex--;
523 		if (parseindex >= 0)
524 			return (c);
525 	}
526 	if (pushback_index < MAXPUSHBACK-1)
527 		return (pushback_buffer[pushback_index++] = c);
528 	else
529 		return (EOF);
530 }
531 
532 int
533 findeol(void)
534 {
535 	int c;
536 
537 	parsebuf = NULL;
538 
539 	/* Skip to either EOF or the first real EOL. */
540 	while (1) {
541 		if (pushback_index)
542 			c = pushback_buffer[--pushback_index];
543 		else
544 			c = lgetc(0);
545 		if (c == '\n') {
546 			file->lineno++;
547 			break;
548 		}
549 		if (c == EOF)
550 			break;
551 	}
552 	return (ERROR);
553 }
554 
555 int
556 yylex(void)
557 {
558 	unsigned char buf[8096];
559 	unsigned char *p, *val;
560 	int quotec, next, c;
561 	int token;
562 
563 top:
564 	p = buf;
565 	c = lgetc(0);
566 	while (c == ' ' || c == '\t')
567 		c = lgetc(0); /* nothing */
568 
569 	yylval.lineno = file->lineno;
570 	if (c == '#') {
571 		c = lgetc(0);
572 		while (c != '\n' && c != EOF)
573 			c = lgetc(0); /* nothing */
574 	}
575 	if (c == '$' && parsebuf == NULL) {
576 		while (1) {
577 			c = lgetc(0);
578 			if (c == EOF)
579 				return (0);
580 
581 			if (p + 1 >= buf + sizeof(buf) - 1) {
582 				yyerror("string too long");
583 				return (findeol());
584 			}
585 			if (isalnum(c) || c == '_') {
586 				*p++ = c;
587 				continue;
588 			}
589 			*p = '\0';
590 			lungetc(c);
591 			break;
592 		}
593 		val = symget(buf);
594 		if (val == NULL) {
595 			yyerror("macro '%s' not defined", buf);
596 			return (findeol());
597 		}
598 		parsebuf = val;
599 		parseindex = 0;
600 		goto top;
601 	}
602 
603 	switch (c) {
604 	case '\'':
605 	case '"':
606 		quotec = c;
607 		while (1) {
608 			c = lgetc(quotec);
609 			if (c == EOF)
610 				return (0);
611 			if (c == '\n') {
612 				file->lineno++;
613 				continue;
614 			} else if (c == '\\') {
615 				next = lgetc(quotec);
616 				if (next == EOF)
617 					return (0);
618 				if (next == quotec || c == ' ' || c == '\t')
619 					c = next;
620 				else if (next == '\n') {
621 					file->lineno++;
622 					continue;
623 				} else
624 					lungetc(next);
625 			} else if (c == quotec) {
626 				*p = '\0';
627 				break;
628 			} else if (c == '\0') {
629 				yyerror("syntax error");
630 				return (findeol());
631 			}
632 			if (p + 1 >= buf + sizeof(buf) - 1) {
633 				yyerror("string too long");
634 				return (findeol());
635 			}
636 			*p++ = c;
637 		}
638 		yylval.v.string = strdup(buf);
639 		if (yylval.v.string == NULL)
640 			err(1, "yylex: strdup");
641 		return (STRING);
642 	}
643 
644 #define allowed_to_end_number(x) \
645 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
646 
647 	if (c == '-' || isdigit(c)) {
648 		do {
649 			*p++ = c;
650 			if ((unsigned)(p-buf) >= sizeof(buf)) {
651 				yyerror("string too long");
652 				return (findeol());
653 			}
654 			c = lgetc(0);
655 		} while (c != EOF && isdigit(c));
656 		lungetc(c);
657 		if (p == buf + 1 && buf[0] == '-')
658 			goto nodigits;
659 		if (c == EOF || allowed_to_end_number(c)) {
660 			const char *errstr = NULL;
661 
662 			*p = '\0';
663 			yylval.v.number = strtonum(buf, LLONG_MIN,
664 			    LLONG_MAX, &errstr);
665 			if (errstr) {
666 				yyerror("\"%s\" invalid number: %s",
667 				    buf, errstr);
668 				return (findeol());
669 			}
670 			return (NUMBER);
671 		} else {
672 nodigits:
673 			while (p > buf + 1)
674 				lungetc(*--p);
675 			c = *--p;
676 			if (c == '-')
677 				return (c);
678 		}
679 	}
680 
681 #define allowed_in_string(x) \
682 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
683 	x != '{' && x != '}' && \
684 	x != '!' && x != '=' && x != '#' && \
685 	x != ','))
686 
687 	if (isalnum(c) || c == ':' || c == '_') {
688 		do {
689 			*p++ = c;
690 			if ((unsigned)(p-buf) >= sizeof(buf)) {
691 				yyerror("string too long");
692 				return (findeol());
693 			}
694 			c = lgetc(0);
695 		} while (c != EOF && (allowed_in_string(c)));
696 		lungetc(c);
697 		*p = '\0';
698 		token = lookup(buf);
699 		if (token == STRING) {
700 			yylval.v.string = strdup(buf);
701 			if (yylval.v.string == NULL)
702 				err(1, "yylex: strdup");
703 		}
704 		return (token);
705 	}
706 	if (c == '\n') {
707 		yylval.lineno = file->lineno;
708 		file->lineno++;
709 	}
710 	if (c == EOF)
711 		return (0);
712 	return (c);
713 }
714 
715 int
716 check_file_secrecy(int fd, const char *fname)
717 {
718 	struct stat st;
719 
720 	if (fstat(fd, &st)) {
721 		log_warn("cannot stat %s", fname);
722 		return (-1);
723 	}
724 	if (st.st_uid != 0 && st.st_uid != getuid()) {
725 		log_warnx("%s: owner not root or current user", fname);
726 		return (-1);
727 	}
728 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
729 		log_warnx("%s: group writable or world read/writable", fname);
730 		return (-1);
731 	}
732 	return (0);
733 }
734 
735 struct file *
736 newfile(const char *name, int secret)
737 {
738 	struct file *nfile;
739 
740 	nfile = calloc(1, sizeof(struct file));
741 	if (nfile == NULL) {
742 		log_warn("calloc");
743 		return (NULL);
744 	}
745 	nfile->name = strdup(name);
746 	if (nfile->name == NULL) {
747 		log_warn("strdup");
748 		free(nfile);
749 		return (NULL);
750 	}
751 	nfile->stream = fopen(nfile->name, "r");
752 	if (nfile->stream == NULL) {
753 		/* no warning, we don't require a conf file */
754 		free(nfile->name);
755 		free(nfile);
756 		return (NULL);
757 	} else if (secret &&
758 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
759 		fclose(nfile->stream);
760 		free(nfile->name);
761 		free(nfile);
762 		return (NULL);
763 	}
764 	nfile->lineno = 1;
765 	return (nfile);
766 }
767 
768 static void
769 closefile(struct file *xfile)
770 {
771 	fclose(xfile->stream);
772 	free(xfile->name);
773 	free(xfile);
774 }
775 
776 static void
777 add_default_server(void)
778 {
779 	new_srv = conf_new_server(D_SITENAME);
780 	log_debug("%s: adding default server %s", __func__, D_SITENAME);
781 }
782 
783 int
784 parse_config(const char *filename, struct gotwebd *env)
785 {
786 	struct sym *sym, *next;
787 
788 	if (config_init(env) == -1)
789 		fatalx("failed to initialize configuration");
790 
791 	gotwebd = env;
792 
793 	file = newfile(filename, 0);
794 	if (file == NULL) {
795 		add_default_server();
796 		sockets_parse_sockets(env);
797 		/* just return, as we don't require a conf file */
798 		return (0);
799 	}
800 
801 	yyparse();
802 	errors = file->errors;
803 	closefile(file);
804 
805 	/* Free macros and check which have not been used. */
806 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
807 		if ((gotwebd->gotwebd_verbose > 1) && !sym->used)
808 			fprintf(stderr, "warning: macro '%s' not used\n",
809 			    sym->nam);
810 		if (!sym->persist) {
811 			free(sym->nam);
812 			free(sym->val);
813 			TAILQ_REMOVE(&symhead, sym, entry);
814 			free(sym);
815 		}
816 	}
817 
818 	if (errors)
819 		return (-1);
820 
821 	/* just add default server if no config specified */
822 	if (gotwebd->server_cnt == 0)
823 		add_default_server();
824 
825 	/* setup our listening sockets */
826 	sockets_parse_sockets(env);
827 
828 	return (0);
829 }
830 
831 struct server *
832 conf_new_server(const char *name)
833 {
834 	struct server *srv = NULL;
835 
836 	srv = calloc(1, sizeof(*srv));
837 	if (srv == NULL)
838 		fatalx("%s: calloc", __func__);
839 
840 	n = strlcpy(srv->name, name, sizeof(srv->name));
841 	if (n >= sizeof(srv->name))
842 		fatalx("%s: strlcpy", __func__);
843 	n = snprintf(srv->unix_socket_name,
844 	    sizeof(srv->unix_socket_name), "%s%s", D_HTTPD_CHROOT,
845 	    D_UNIX_SOCKET);
846 	if (n < 0 || (size_t)n >= sizeof(srv->unix_socket_name))
847 		fatalx("%s: snprintf", __func__);
848 	n = strlcpy(srv->repos_path, D_GOTPATH,
849 	    sizeof(srv->repos_path));
850 	if (n >= sizeof(srv->repos_path))
851 		fatalx("%s: strlcpy", __func__);
852 	n = strlcpy(srv->site_name, D_SITENAME,
853 	    sizeof(srv->site_name));
854 	if (n >= sizeof(srv->site_name))
855 		fatalx("%s: strlcpy", __func__);
856 	n = strlcpy(srv->site_owner, D_SITEOWNER,
857 	    sizeof(srv->site_owner));
858 	if (n >= sizeof(srv->site_owner))
859 		fatalx("%s: strlcpy", __func__);
860 	n = strlcpy(srv->site_link, D_SITELINK,
861 	    sizeof(srv->site_link));
862 	if (n >= sizeof(srv->site_link))
863 		fatalx("%s: strlcpy", __func__);
864 	n = strlcpy(srv->logo, D_GOTLOGO,
865 	    sizeof(srv->logo));
866 	if (n >= sizeof(srv->logo))
867 		fatalx("%s: strlcpy", __func__);
868 	n = strlcpy(srv->logo_url, D_GOTURL, sizeof(srv->logo_url));
869 	if (n >= sizeof(srv->logo_url))
870 		fatalx("%s: strlcpy", __func__);
871 	n = strlcpy(srv->custom_css, D_GOTWEBCSS, sizeof(srv->custom_css));
872 	if (n >= sizeof(srv->custom_css))
873 		fatalx("%s: strlcpy", __func__);
874 
875 	srv->show_site_owner = D_SHOWSOWNER;
876 	srv->show_repo_owner = D_SHOWROWNER;
877 	srv->show_repo_age = D_SHOWAGE;
878 	srv->show_repo_description = D_SHOWDESC;
879 	srv->show_repo_cloneurl = D_SHOWURL;
880 
881 	srv->max_repos_display = D_MAXREPODISP;
882 	srv->max_commits_display = D_MAXCOMMITDISP;
883 	srv->max_repos = D_MAXREPO;
884 
885 	srv->unix_socket = 1;
886 	srv->fcgi_socket = 0;
887 
888 	TAILQ_INIT(&srv->al);
889 	TAILQ_INSERT_TAIL(&gotwebd->servers, srv, entry);
890 	gotwebd->server_cnt++;
891 
892 	return srv;
893 };
894 
895 int
896 symset(const char *nam, const char *val, int persist)
897 {
898 	struct sym *sym;
899 
900 	TAILQ_FOREACH(sym, &symhead, entry) {
901 		if (strcmp(nam, sym->nam) == 0)
902 			break;
903 	}
904 
905 	if (sym != NULL) {
906 		if (sym->persist == 1)
907 			return (0);
908 		else {
909 			free(sym->nam);
910 			free(sym->val);
911 			TAILQ_REMOVE(&symhead, sym, entry);
912 			free(sym);
913 		}
914 	}
915 	sym = calloc(1, sizeof(*sym));
916 	if (sym == NULL)
917 		return (-1);
918 
919 	sym->nam = strdup(nam);
920 	if (sym->nam == NULL) {
921 		free(sym);
922 		return (-1);
923 	}
924 	sym->val = strdup(val);
925 	if (sym->val == NULL) {
926 		free(sym->nam);
927 		free(sym);
928 		return (-1);
929 	}
930 	sym->used = 0;
931 	sym->persist = persist;
932 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
933 	return (0);
934 }
935 
936 int
937 cmdline_symset(char *s)
938 {
939 	char *sym, *val;
940 	int ret;
941 
942 	val = strrchr(s, '=');
943 	if (val == NULL)
944 		return (-1);
945 
946 	sym = strndup(s, val - s);
947 	if (sym == NULL)
948 		fatal("%s: strndup", __func__);
949 
950 	ret = symset(sym, val + 1, 1);
951 	free(sym);
952 
953 	return (ret);
954 }
955 
956 char *
957 symget(const char *nam)
958 {
959 	struct sym *sym;
960 
961 	TAILQ_FOREACH(sym, &symhead, entry) {
962 		if (strcmp(nam, sym->nam) == 0) {
963 			sym->used = 1;
964 			return (sym->val);
965 		}
966 	}
967 	return (NULL);
968 }
969 
970 int
971 getservice(const char *n)
972 {
973 	struct servent *s;
974 	const char *errstr;
975 	long long llval;
976 
977 	llval = strtonum(n, 0, UINT16_MAX, &errstr);
978 	if (errstr) {
979 		s = getservbyname(n, "tcp");
980 		if (s == NULL)
981 			s = getservbyname(n, "udp");
982 		if (s == NULL)
983 			return (-1);
984 		return ntohs(s->s_port);
985 	}
986 
987 	return (unsigned short)llval;
988 }
989 
990 struct address *
991 host_v4(const char *s)
992 {
993 	struct in_addr ina;
994 	struct sockaddr_in *sain;
995 	struct address *h;
996 
997 	memset(&ina, 0, sizeof(ina));
998 	if (inet_pton(AF_INET, s, &ina) != 1)
999 		return (NULL);
1000 
1001 	if ((h = calloc(1, sizeof(*h))) == NULL)
1002 		fatal(__func__);
1003 	sain = (struct sockaddr_in *)&h->ss;
1004 	got_sockaddr_inet_init(sain, &ina);
1005 	if (sain->sin_addr.s_addr == INADDR_ANY)
1006 		h->prefixlen = 0; /* 0.0.0.0 address */
1007 	else
1008 		h->prefixlen = -1; /* host address */
1009 	return (h);
1010 }
1011 
1012 struct address *
1013 host_v6(const char *s)
1014 {
1015 	struct addrinfo hints, *res;
1016 	struct sockaddr_in6 *sa_in6, *ra;
1017 	struct address *h = NULL;
1018 
1019 	memset(&hints, 0, sizeof(hints));
1020 	hints.ai_family = AF_INET6;
1021 	hints.ai_socktype = SOCK_DGRAM; /* dummy */
1022 	hints.ai_flags = AI_NUMERICHOST;
1023 	if (getaddrinfo(s, "0", &hints, &res) == 0) {
1024 		if ((h = calloc(1, sizeof(*h))) == NULL)
1025 			fatal(__func__);
1026 		sa_in6 = (struct sockaddr_in6 *)&h->ss;
1027 		ra = (struct sockaddr_in6 *)res->ai_addr;
1028 		got_sockaddr_inet6_init(sa_in6, &ra->sin6_addr,
1029 		    ra->sin6_scope_id);
1030 		if (memcmp(&sa_in6->sin6_addr, &in6addr_any,
1031 		    sizeof(sa_in6->sin6_addr)) == 0)
1032 			h->prefixlen = 0; /* any address */
1033 		else
1034 			h->prefixlen = -1; /* host address */
1035 		freeaddrinfo(res);
1036 	}
1037 
1038 	return (h);
1039 }
1040 
1041 int
1042 host_dns(const char *s, struct server *new_srv, int max,
1043     in_port_t port, const char *ifname, int ipproto)
1044 {
1045 	struct addrinfo hints, *res0, *res;
1046 	int error, cnt = 0;
1047 	struct sockaddr_in *sain;
1048 	struct sockaddr_in6 *sin6;
1049 	struct address *h;
1050 
1051 	if ((cnt = host_if(s, new_srv, max, port, ifname, ipproto)) != 0)
1052 		return (cnt);
1053 
1054 	memset(&hints, 0, sizeof(hints));
1055 	hints.ai_family = PF_UNSPEC;
1056 	hints.ai_socktype = SOCK_DGRAM; /* DUMMY */
1057 	hints.ai_flags = AI_ADDRCONFIG;
1058 	error = getaddrinfo(s, NULL, &hints, &res0);
1059 	if (error == EAI_AGAIN || error == EAI_NODATA || error == EAI_NONAME)
1060 		return (0);
1061 	if (error) {
1062 		log_warnx("%s: could not parse \"%s\": %s", __func__, s,
1063 		    gai_strerror(error));
1064 		return (-1);
1065 	}
1066 
1067 	for (res = res0; res && cnt < max; res = res->ai_next) {
1068 		if (res->ai_family != AF_INET &&
1069 		    res->ai_family != AF_INET6)
1070 			continue;
1071 		if ((h = calloc(1, sizeof(*h))) == NULL)
1072 			fatal(__func__);
1073 
1074 		if (port)
1075 			h->port = port;
1076 		if (ifname != NULL) {
1077 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1078 			    sizeof(h->ifname)) {
1079 				log_warnx("%s: interface name truncated",
1080 				    __func__);
1081 				freeaddrinfo(res0);
1082 				free(h);
1083 				return (-1);
1084 			}
1085 		}
1086 		if (ipproto != -1)
1087 			h->ipproto = ipproto;
1088 		h->ss.ss_family = res->ai_family;
1089 		h->prefixlen = -1; /* host address */
1090 
1091 		if (res->ai_family == AF_INET) {
1092 			struct sockaddr_in *ra;
1093 			sain = (struct sockaddr_in *)&h->ss;
1094 			ra = (struct sockaddr_in *)res->ai_addr;
1095 			got_sockaddr_inet_init(sain, &ra->sin_addr);
1096 		} else {
1097 			struct sockaddr_in6 *ra;
1098 			sin6 = (struct sockaddr_in6 *)&h->ss;
1099 			ra = (struct sockaddr_in6 *)res->ai_addr;
1100 			got_sockaddr_inet6_init(sin6, &ra->sin6_addr, 0);
1101 		}
1102 
1103 		if (add_addr(new_srv, h))
1104 			return -1;
1105 		cnt++;
1106 	}
1107 	if (cnt == max && res) {
1108 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1109 		    s, max);
1110 	}
1111 	freeaddrinfo(res0);
1112 	return (cnt);
1113 }
1114 
1115 int
1116 host_if(const char *s, struct server *new_srv, int max,
1117     in_port_t port, const char *ifname, int ipproto)
1118 {
1119 	struct ifaddrs *ifap, *p;
1120 	struct sockaddr_in *sain;
1121 	struct sockaddr_in6 *sin6;
1122 	struct address *h;
1123 	int cnt = 0, af;
1124 
1125 	if (getifaddrs(&ifap) == -1)
1126 		fatal("getifaddrs");
1127 
1128 	/* First search for IPv4 addresses */
1129 	af = AF_INET;
1130 
1131  nextaf:
1132 	for (p = ifap; p != NULL && cnt < max; p = p->ifa_next) {
1133 		if (p->ifa_addr == NULL ||
1134 		    p->ifa_addr->sa_family != af ||
1135 		    (strcmp(s, p->ifa_name) != 0 &&
1136 		    !is_if_in_group(p->ifa_name, s)))
1137 			continue;
1138 		if ((h = calloc(1, sizeof(*h))) == NULL)
1139 			fatal("calloc");
1140 
1141 		if (port)
1142 			h->port = port;
1143 		if (ifname != NULL) {
1144 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1145 			    sizeof(h->ifname)) {
1146 				log_warnx("%s: interface name truncated",
1147 				    __func__);
1148 				free(h);
1149 				freeifaddrs(ifap);
1150 				return (-1);
1151 			}
1152 		}
1153 		if (ipproto != -1)
1154 			h->ipproto = ipproto;
1155 		h->ss.ss_family = af;
1156 		h->prefixlen = -1; /* host address */
1157 
1158 		if (af == AF_INET) {
1159 			struct sockaddr_in *ra;
1160 			sain = (struct sockaddr_in *)&h->ss;
1161 			ra = (struct sockaddr_in *)p->ifa_addr;
1162 			got_sockaddr_inet_init(sain, &ra->sin_addr);
1163 		} else {
1164 			struct sockaddr_in6 *ra;
1165 			sin6 = (struct sockaddr_in6 *)&h->ss;
1166 			ra = (struct sockaddr_in6 *)p->ifa_addr;
1167 			got_sockaddr_inet6_init(sin6, &ra->sin6_addr,
1168 			    ra->sin6_scope_id);
1169 		}
1170 
1171 		if (add_addr(new_srv, h))
1172 			return -1;
1173 		cnt++;
1174 	}
1175 	if (af == AF_INET) {
1176 		/* Next search for IPv6 addresses */
1177 		af = AF_INET6;
1178 		goto nextaf;
1179 	}
1180 
1181 	if (cnt > max) {
1182 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1183 		    s, max);
1184 	}
1185 	freeifaddrs(ifap);
1186 	return (cnt);
1187 }
1188 
1189 int
1190 host(const char *s, struct server *new_srv, int max,
1191     in_port_t port, const char *ifname, int ipproto)
1192 {
1193 	struct address *h;
1194 
1195 	h = host_v4(s);
1196 
1197 	/* IPv6 address? */
1198 	if (h == NULL)
1199 		h = host_v6(s);
1200 
1201 	if (h != NULL) {
1202 		if (port)
1203 			h->port = port;
1204 		if (ifname != NULL) {
1205 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1206 			    sizeof(h->ifname)) {
1207 				log_warnx("%s: interface name truncated",
1208 				    __func__);
1209 				free(h);
1210 				return (-1);
1211 			}
1212 		}
1213 		if (ipproto != -1)
1214 			h->ipproto = ipproto;
1215 
1216 		if (add_addr(new_srv, h))
1217 			return -1;
1218 		return (1);
1219 	}
1220 
1221 	return (host_dns(s, new_srv, max, port, ifname, ipproto));
1222 }
1223 
1224 int
1225 is_if_in_group(const char *ifname, const char *groupname)
1226 {
1227 	unsigned int len;
1228 	struct ifgroupreq ifgr;
1229 	struct ifg_req *ifg;
1230 	int s;
1231 	int ret = 0;
1232 
1233 	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
1234 		err(1, "socket");
1235 
1236 	memset(&ifgr, 0, sizeof(ifgr));
1237 	if (strlcpy(ifgr.ifgr_name, ifname, IFNAMSIZ) >= IFNAMSIZ)
1238 		err(1, "IFNAMSIZ");
1239 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1) {
1240 		if (errno == EINVAL || errno == ENOTTY)
1241 			goto end;
1242 		err(1, "SIOCGIFGROUP");
1243 	}
1244 
1245 	len = ifgr.ifgr_len;
1246 	ifgr.ifgr_groups = calloc(len / sizeof(struct ifg_req),
1247 	    sizeof(struct ifg_req));
1248 	if (ifgr.ifgr_groups == NULL)
1249 		err(1, "getifgroups");
1250 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1)
1251 		err(1, "SIOCGIFGROUP");
1252 
1253 	ifg = ifgr.ifgr_groups;
1254 	for (; ifg && len >= sizeof(struct ifg_req); ifg++) {
1255 		len -= sizeof(struct ifg_req);
1256 		if (strcmp(ifg->ifgrq_group, groupname) == 0) {
1257 			ret = 1;
1258 			break;
1259 		}
1260 	}
1261 	free(ifgr.ifgr_groups);
1262 
1263 end:
1264 	close(s);
1265 	return (ret);
1266 }
1267 
1268 int
1269 get_addrs(const char *addr, struct server *new_srv, in_port_t port)
1270 {
1271 	if (strcmp("", addr) == 0) {
1272 		if (host("127.0.0.1", new_srv, 1, port, "127.0.0.1",
1273 		    -1) <= 0) {
1274 			yyerror("invalid listen ip: %s",
1275 			    "127.0.0.1");
1276 			return (-1);
1277 		}
1278 		if (host("::1", new_srv, 1, port, "::1", -1) <= 0) {
1279 			yyerror("invalid listen ip: %s", "::1");
1280 			return (-1);
1281 		}
1282 	} else {
1283 		if (host(addr, new_srv, GOTWEBD_MAXIFACE, port, addr,
1284 		    -1) <= 0) {
1285 			yyerror("invalid listen ip: %s", addr);
1286 			return (-1);
1287 		}
1288 	}
1289 	return (0);
1290 }
1291 
1292 int
1293 addr_dup_check(struct addresslist *al, struct address *h, const char *new_srv,
1294     const char *other_srv)
1295 {
1296 	struct address *a;
1297 	void *ia;
1298 	char buf[INET6_ADDRSTRLEN];
1299 	const char *addrstr;
1300 
1301 	TAILQ_FOREACH(a, al, entry) {
1302 		if (memcmp(&a->ss, &h->ss, sizeof(h->ss)) != 0 ||
1303 		    a->port != h->port)
1304 			continue;
1305 
1306 		switch (h->ss.ss_family) {
1307 		case AF_INET:
1308 			ia = &((struct sockaddr_in *)(&h->ss))->sin_addr;
1309 			break;
1310 		case AF_INET6:
1311 			ia = &((struct sockaddr_in6 *)(&h->ss))->sin6_addr;
1312 			break;
1313 		default:
1314 			yyerror("unknown address family: %d", h->ss.ss_family);
1315 			return -1;
1316 		}
1317 		addrstr = inet_ntop(h->ss.ss_family, ia, buf, sizeof(buf));
1318 		if (addrstr) {
1319 			if (other_srv) {
1320 				yyerror("server %s: duplicate fcgi listen "
1321 				    "address %s:%d, already used by server %s",
1322 				    new_srv, addrstr, h->port, other_srv);
1323 			} else {
1324 				log_warnx("server: %s: duplicate fcgi listen "
1325 				    "address %s:%d", new_srv, addrstr, h->port);
1326 			}
1327 		} else {
1328 			if (other_srv) {
1329 				yyerror("server: %s: duplicate fcgi listen "
1330 				    "address, already used by server %s",
1331 				    new_srv, other_srv);
1332 			} else {
1333 				log_warnx("server %s: duplicate fcgi listen "
1334 				    "address", new_srv);
1335 			}
1336 		}
1337 
1338 		return -1;
1339 	}
1340 
1341 	return 0;
1342 }
1343 
1344 int
1345 add_addr(struct server *new_srv, struct address *h)
1346 {
1347 	struct server *srv;
1348 
1349 	/* Address cannot be shared between different servers. */
1350 	TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
1351 		if (srv == new_srv)
1352 			continue;
1353 		if (addr_dup_check(&srv->al, h, new_srv->name, srv->name))
1354 			return -1;
1355 	}
1356 
1357 	/* Tolerate duplicate address lines within the scope of a server. */
1358 	if (addr_dup_check(&new_srv->al, h, NULL, NULL) == 0)
1359 		TAILQ_INSERT_TAIL(&new_srv->al, h, entry);
1360 	else
1361 		free(h);
1362 
1363 	return 0;
1364 }