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 <limits.h>
41 #include <netdb.h>
42 #include <stdarg.h>
43 #include <stdlib.h>
44 #include <stdio.h>
45 #include <string.h>
46 #include <syslog.h>
47 #include <unistd.h>
48 
49 #include "proc.h"
50 #include "gotwebd.h"
51 #include "got_sockaddr.h"
52 
53 TAILQ_HEAD(files, file)		 files = TAILQ_HEAD_INITIALIZER(files);
54 static struct file {
55 	TAILQ_ENTRY(file)	 entry;
56 	FILE			*stream;
57 	char			*name;
58 	int			 lineno;
59 	int			 errors;
60 } *file;
61 struct file	*newfile(const char *, int);
62 static void	 closefile(struct file *);
63 int		 check_file_secrecy(int, const char *);
64 int		 yyparse(void);
65 int		 yylex(void);
66 int		 yyerror(const char *, ...)
67     __attribute__((__format__ (printf, 1, 2)))
68     __attribute__((__nonnull__ (1)));
69 int		 kw_cmp(const void *, const void *);
70 int		 lookup(char *);
71 int		 lgetc(int);
72 int		 lungetc(int);
73 int		 findeol(void);
74 
75 TAILQ_HEAD(symhead, sym)	 symhead = TAILQ_HEAD_INITIALIZER(symhead);
76 struct sym {
77 	TAILQ_ENTRY(sym)	 entry;
78 	int			 used;
79 	int			 persist;
80 	char			*nam;
81 	char			*val;
82 };
83 
84 int	 symset(const char *, const char *, int);
85 char	*symget(const char *);
86 
87 static int		 errors;
88 
89 static struct gotwebd		*gotwebd;
90 static struct server		*new_srv;
91 static struct server		*conf_new_server(const char *);
92 int				 getservice(const char *);
93 int				 n;
94 
95 int		 get_addrs(const char *, struct server *, in_port_t);
96 int		 addr_dup_check(struct addresslist *, struct address *,
97 		    const char *, const char *);
98 int		 add_addr(struct server *, struct address *);
99 struct address	*host_v4(const char *);
100 struct address	*host_v6(const char *);
101 int		 host_dns(const char *, struct server *,
102 		    int, in_port_t, const char *, int);
103 int		 host_if(const char *, struct server *,
104 		    int, in_port_t, const char *, int);
105 int		 host(const char *, struct server *,
106 		    int, in_port_t, const char *, int);
107 int		 is_if_in_group(const char *, const char *);
108 
109 typedef struct {
110 	union {
111 		long long	 number;
112 		char		*string;
113 		in_port_t	 port;
114 	} v;
115 	int lineno;
116 } YYSTYPE;
117 
118 %}
119 
120 %token	LISTEN WWW_PATH MAX_REPOS SITE_NAME SITE_OWNER SITE_LINK LOGO
121 %token	LOGO_URL SHOW_REPO_OWNER SHOW_REPO_AGE SHOW_REPO_DESCRIPTION
122 %token	MAX_REPOS_DISPLAY REPOS_PATH MAX_COMMITS_DISPLAY ON ERROR
123 %token	SHOW_SITE_OWNER SHOW_REPO_CLONEURL PORT PREFORK
124 %token	UNIX_SOCKET UNIX_SOCKET_NAME SERVER CHROOT CUSTOM_CSS
125 
126 %token	<v.string>	STRING
127 %type	<v.port>	fcgiport
128 %token	<v.number>	NUMBER
129 %type	<v.number>	boolean
130 
131 %%
132 
133 grammar		: /* empty */
134 		| grammar '\n'
135 		| grammar varset '\n'
136 		| grammar main '\n'
137 		| grammar server '\n'
138 		| grammar error '\n'		{ file->errors++; }
139 		;
140 
141 varset		: STRING '=' STRING	{
142 			char *s = $1;
143 			while (*s++) {
144 				if (isspace((unsigned char)*s)) {
145 					yyerror("macro name cannot contain "
146 					    "whitespace");
147 					free($1);
148 					free($3);
149 					YYERROR;
150 				}
151 			}
152 			if (symset($1, $3, 0) == -1)
153 				fatal("cannot store variable");
154 			free($1);
155 			free($3);
156 		}
157 		;
158 
159 boolean		: STRING {
160 			if (strcasecmp($1, "1") == 0 ||
161 			    strcasecmp($1, "yes") == 0 ||
162 			    strcasecmp($1, "on") == 0)
163 				$$ = 1;
164 			else if (strcasecmp($1, "0") == 0 ||
165 			    strcasecmp($1, "off") == 0 ||
166 			    strcasecmp($1, "no") == 0)
167 				$$ = 0;
168 			else {
169 				yyerror("invalid boolean value '%s'", $1);
170 				free($1);
171 				YYERROR;
172 			}
173 			free($1);
174 		}
175 		| ON { $$ = 1; }
176 		| NUMBER { $$ = $1; }
177 		;
178 
179 fcgiport	: PORT NUMBER {
180 			if ($2 <= 0 || $2 > (int)USHRT_MAX) {
181 				yyerror("invalid port: %lld", $2);
182 				YYERROR;
183 			}
184 			$$ = $2;
185 		}
186 		| PORT STRING {
187 			int	 val;
188 
189 			if ((val = getservice($2)) == -1) {
190 				yyerror("invalid port: %s", $2);
191 				free($2);
192 				YYERROR;
193 			}
194 			free($2);
195 
196 			$$ = val;
197 		}
198 		;
199 
200 main		: PREFORK NUMBER {
201 			gotwebd->prefork_gotwebd = $2;
202 		}
203 		| CHROOT STRING {
204 			n = strlcpy(gotwebd->httpd_chroot, $2,
205 			    sizeof(gotwebd->httpd_chroot));
206 			if (n >= sizeof(gotwebd->httpd_chroot)) {
207 				yyerror("%s: httpd_chroot truncated", __func__);
208 				free($2);
209 				YYERROR;
210 			}
211 			free($2);
212 		}
213 		| UNIX_SOCKET boolean {
214 			gotwebd->unix_socket = $2;
215 		}
216 		| UNIX_SOCKET_NAME STRING {
217 			n = snprintf(gotwebd->unix_socket_name,
218 			    sizeof(gotwebd->unix_socket_name), "%s%s",
219 			    strlen(gotwebd->httpd_chroot) ?
220 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $2);
221 			if (n < 0 ||
222 			    (size_t)n >= sizeof(gotwebd->unix_socket_name)) {
223 				yyerror("%s: unix_socket_name truncated",
224 				    __func__);
225 				free($2);
226 				YYERROR;
227 			}
228 			free($2);
229 		}
230 		;
231 
232 server		: SERVER STRING {
233 			struct server *srv;
234 
235 			TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
236 				if (strcmp(srv->name, $2) == 0) {
237 					yyerror("server name exists '%s'", $2);
238 					free($2);
239 					YYERROR;
240 				}
241 			}
242 
243 			new_srv = conf_new_server($2);
244 			log_debug("adding server %s", $2);
245 			free($2);
246 		}
247 		| SERVER STRING {
248 			struct server *srv;
249 
250 			TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
251 				if (strcmp(srv->name, $2) == 0) {
252 					yyerror("server name exists '%s'", $2);
253 					free($2);
254 					YYERROR;
255 				}
256 			}
257 
258 			new_srv = conf_new_server($2);
259 			log_debug("adding server %s", $2);
260 			free($2);
261 		} '{' optnl serveropts2 '}' {
262 		}
263 		;
264 
265 serveropts1	: REPOS_PATH STRING {
266 			n = strlcpy(new_srv->repos_path, $2,
267 			    sizeof(new_srv->repos_path));
268 			if (n >= sizeof(new_srv->repos_path)) {
269 				yyerror("%s: repos_path truncated", __func__);
270 				free($2);
271 				YYERROR;
272 			}
273 			free($2);
274 		}
275 		| SITE_NAME STRING {
276 			n = strlcpy(new_srv->site_name, $2,
277 			    sizeof(new_srv->site_name));
278 			if (n >= sizeof(new_srv->site_name)) {
279 				yyerror("%s: site_name truncated", __func__);
280 				free($2);
281 				YYERROR;
282 			}
283 			free($2);
284 		}
285 		| SITE_OWNER STRING {
286 			n = strlcpy(new_srv->site_owner, $2,
287 			    sizeof(new_srv->site_owner));
288 			if (n >= sizeof(new_srv->site_owner)) {
289 				yyerror("%s: site_owner truncated", __func__);
290 				free($2);
291 				YYERROR;
292 			}
293 			free($2);
294 		}
295 		| SITE_LINK STRING {
296 			n = strlcpy(new_srv->site_link, $2,
297 			    sizeof(new_srv->site_link));
298 			if (n >= sizeof(new_srv->site_link)) {
299 				yyerror("%s: site_link truncated", __func__);
300 				free($2);
301 				YYERROR;
302 			}
303 			free($2);
304 		}
305 		| LOGO STRING {
306 			n = strlcpy(new_srv->logo, $2, sizeof(new_srv->logo));
307 			if (n >= sizeof(new_srv->logo)) {
308 				yyerror("%s: logo truncated", __func__);
309 				free($2);
310 				YYERROR;
311 			}
312 			free($2);
313 		}
314 		| LOGO_URL STRING {
315 			n = strlcpy(new_srv->logo_url, $2,
316 			    sizeof(new_srv->logo_url));
317 			if (n >= sizeof(new_srv->logo_url)) {
318 				yyerror("%s: logo_url truncated", __func__);
319 				free($2);
320 				YYERROR;
321 			}
322 			free($2);
323 		}
324 		| CUSTOM_CSS STRING {
325 			n = strlcpy(new_srv->custom_css, $2,
326 			    sizeof(new_srv->custom_css));
327 			if (n >= sizeof(new_srv->custom_css)) {
328 				yyerror("%s: custom_css truncated", __func__);
329 				free($2);
330 				YYERROR;
331 			}
332 			free($2);
333 		}
334 		| LISTEN ON STRING fcgiport {
335 			if (get_addrs($3, new_srv, $4) == -1) {
336 				yyerror("could not get addrs");
337 				YYERROR;
338 			}
339 			new_srv->fcgi_socket = 1;
340 		}
341 		| MAX_REPOS NUMBER {
342 			if ($2 > 0)
343 				new_srv->max_repos = $2;
344 		}
345 		| SHOW_SITE_OWNER boolean {
346 			new_srv->show_site_owner = $2;
347 		}
348 		| SHOW_REPO_OWNER boolean {
349 			new_srv->show_repo_owner = $2;
350 		}
351 		| SHOW_REPO_AGE boolean {
352 			new_srv->show_repo_age = $2;
353 		}
354 		| SHOW_REPO_DESCRIPTION boolean {
355 			new_srv->show_repo_description = $2;
356 		}
357 		| SHOW_REPO_CLONEURL boolean {
358 			new_srv->show_repo_cloneurl = $2;
359 		}
360 		| MAX_REPOS_DISPLAY NUMBER {
361 				new_srv->max_repos_display = $2;
362 		}
363 		| MAX_COMMITS_DISPLAY NUMBER {
364 			if ($2 > 0)
365 				new_srv->max_commits_display = $2;
366 		}
367 		| UNIX_SOCKET boolean {
368 			new_srv->unix_socket = $2;
369 		}
370 		| UNIX_SOCKET_NAME STRING {
371 			n = snprintf(new_srv->unix_socket_name,
372 			    sizeof(new_srv->unix_socket_name), "%s%s",
373 			    strlen(gotwebd->httpd_chroot) ?
374 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $2);
375 			if (n < 0 ||
376 			    (size_t)n >= sizeof(new_srv->unix_socket_name)) {
377 				yyerror("%s: unix_socket_name truncated",
378 				    __func__);
379 				free($2);
380 				YYERROR;
381 			}
382 			free($2);
383 		}
384 		;
385 
386 serveropts2	: serveropts2 serveropts1 nl
387 		| serveropts1 optnl
388 		;
389 
390 nl		: '\n' optnl
391 		;
392 
393 optnl		: '\n' optnl		/* zero or more newlines */
394 		| /* empty */
395 		;
396 
397 %%
398 
399 struct keywords {
400 	const char	*k_name;
401 	int		 k_val;
402 };
403 
404 int
405 yyerror(const char *fmt, ...)
406 {
407 	va_list ap;
408 	char *msg;
409 
410 	file->errors++;
411 	va_start(ap, fmt);
412 	if (vasprintf(&msg, fmt, ap) == -1)
413 		fatalx("yyerror vasprintf");
414 	va_end(ap);
415 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
416 	free(msg);
417 	return (0);
418 }
419 
420 int
421 kw_cmp(const void *k, const void *e)
422 {
423 	return (strcmp(k, ((const struct keywords *)e)->k_name));
424 }
425 
426 int
427 lookup(char *s)
428 {
429 	/* This has to be sorted always. */
430 	static const struct keywords keywords[] = {
431 		{ "chroot",			CHROOT },
432 		{ "custom_css",			CUSTOM_CSS },
433 		{ "listen",			LISTEN },
434 		{ "logo",			LOGO },
435 		{ "logo_url"	,		LOGO_URL },
436 		{ "max_commits_display",	MAX_COMMITS_DISPLAY },
437 		{ "max_repos",			MAX_REPOS },
438 		{ "max_repos_display",		MAX_REPOS_DISPLAY },
439 		{ "on",				ON },
440 		{ "port",			PORT },
441 		{ "prefork",			PREFORK },
442 		{ "repos_path",			REPOS_PATH },
443 		{ "server",			SERVER },
444 		{ "show_repo_age",		SHOW_REPO_AGE },
445 		{ "show_repo_cloneurl",		SHOW_REPO_CLONEURL },
446 		{ "show_repo_description",	SHOW_REPO_DESCRIPTION },
447 		{ "show_repo_owner",		SHOW_REPO_OWNER },
448 		{ "show_site_owner",		SHOW_SITE_OWNER },
449 		{ "site_link",			SITE_LINK },
450 		{ "site_name",			SITE_NAME },
451 		{ "site_owner",			SITE_OWNER },
452 		{ "unix_socket",		UNIX_SOCKET },
453 		{ "unix_socket_name",		UNIX_SOCKET_NAME },
454 	};
455 	const struct keywords *p;
456 
457 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
458 	    sizeof(keywords[0]), kw_cmp);
459 
460 	if (p)
461 		return (p->k_val);
462 	else
463 		return (STRING);
464 }
465 
466 #define MAXPUSHBACK	128
467 
468 unsigned char *parsebuf;
469 int parseindex;
470 unsigned char pushback_buffer[MAXPUSHBACK];
471 int pushback_index = 0;
472 
473 int
474 lgetc(int quotec)
475 {
476 	int c, next;
477 
478 	if (parsebuf) {
479 		/* Read character from the parsebuffer instead of input. */
480 		if (parseindex >= 0) {
481 			c = parsebuf[parseindex++];
482 			if (c != '\0')
483 				return (c);
484 			parsebuf = NULL;
485 		} else
486 			parseindex++;
487 	}
488 
489 	if (pushback_index)
490 		return (pushback_buffer[--pushback_index]);
491 
492 	if (quotec) {
493 		c = getc(file->stream);
494 		if (c == EOF)
495 			yyerror("reached end of file while parsing "
496 			    "quoted string");
497 		return (c);
498 	}
499 
500 	c = getc(file->stream);
501 	while (c == '\\') {
502 		next = getc(file->stream);
503 		if (next != '\n') {
504 			c = next;
505 			break;
506 		}
507 		yylval.lineno = file->lineno;
508 		file->lineno++;
509 		c = getc(file->stream);
510 	}
511 
512 	return (c);
513 }
514 
515 int
516 lungetc(int c)
517 {
518 	if (c == EOF)
519 		return (EOF);
520 	if (parsebuf) {
521 		parseindex--;
522 		if (parseindex >= 0)
523 			return (c);
524 	}
525 	if (pushback_index < MAXPUSHBACK-1)
526 		return (pushback_buffer[pushback_index++] = c);
527 	else
528 		return (EOF);
529 }
530 
531 int
532 findeol(void)
533 {
534 	int c;
535 
536 	parsebuf = NULL;
537 
538 	/* Skip to either EOF or the first real EOL. */
539 	while (1) {
540 		if (pushback_index)
541 			c = pushback_buffer[--pushback_index];
542 		else
543 			c = lgetc(0);
544 		if (c == '\n') {
545 			file->lineno++;
546 			break;
547 		}
548 		if (c == EOF)
549 			break;
550 	}
551 	return (ERROR);
552 }
553 
554 int
555 yylex(void)
556 {
557 	unsigned char buf[8096];
558 	unsigned char *p, *val;
559 	int quotec, next, c;
560 	int token;
561 
562 top:
563 	p = buf;
564 	c = lgetc(0);
565 	while (c == ' ' || c == '\t')
566 		c = lgetc(0); /* nothing */
567 
568 	yylval.lineno = file->lineno;
569 	if (c == '#') {
570 		c = lgetc(0);
571 		while (c != '\n' && c != EOF)
572 			c = lgetc(0); /* nothing */
573 	}
574 	if (c == '$' && parsebuf == NULL) {
575 		while (1) {
576 			c = lgetc(0);
577 			if (c == EOF)
578 				return (0);
579 
580 			if (p + 1 >= buf + sizeof(buf) - 1) {
581 				yyerror("string too long");
582 				return (findeol());
583 			}
584 			if (isalnum(c) || c == '_') {
585 				*p++ = c;
586 				continue;
587 			}
588 			*p = '\0';
589 			lungetc(c);
590 			break;
591 		}
592 		val = symget(buf);
593 		if (val == NULL) {
594 			yyerror("macro '%s' not defined", buf);
595 			return (findeol());
596 		}
597 		parsebuf = val;
598 		parseindex = 0;
599 		goto top;
600 	}
601 
602 	switch (c) {
603 	case '\'':
604 	case '"':
605 		quotec = c;
606 		while (1) {
607 			c = lgetc(quotec);
608 			if (c == EOF)
609 				return (0);
610 			if (c == '\n') {
611 				file->lineno++;
612 				continue;
613 			} else if (c == '\\') {
614 				next = lgetc(quotec);
615 				if (next == EOF)
616 					return (0);
617 				if (next == quotec || c == ' ' || c == '\t')
618 					c = next;
619 				else if (next == '\n') {
620 					file->lineno++;
621 					continue;
622 				} else
623 					lungetc(next);
624 			} else if (c == quotec) {
625 				*p = '\0';
626 				break;
627 			} else if (c == '\0') {
628 				yyerror("syntax error");
629 				return (findeol());
630 			}
631 			if (p + 1 >= buf + sizeof(buf) - 1) {
632 				yyerror("string too long");
633 				return (findeol());
634 			}
635 			*p++ = c;
636 		}
637 		yylval.v.string = strdup(buf);
638 		if (yylval.v.string == NULL)
639 			err(1, "yylex: strdup");
640 		return (STRING);
641 	}
642 
643 #define allowed_to_end_number(x) \
644 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
645 
646 	if (c == '-' || isdigit(c)) {
647 		do {
648 			*p++ = c;
649 			if ((unsigned)(p-buf) >= sizeof(buf)) {
650 				yyerror("string too long");
651 				return (findeol());
652 			}
653 			c = lgetc(0);
654 		} while (c != EOF && isdigit(c));
655 		lungetc(c);
656 		if (p == buf + 1 && buf[0] == '-')
657 			goto nodigits;
658 		if (c == EOF || allowed_to_end_number(c)) {
659 			const char *errstr = NULL;
660 
661 			*p = '\0';
662 			yylval.v.number = strtonum(buf, LLONG_MIN,
663 			    LLONG_MAX, &errstr);
664 			if (errstr) {
665 				yyerror("\"%s\" invalid number: %s",
666 				    buf, errstr);
667 				return (findeol());
668 			}
669 			return (NUMBER);
670 		} else {
671 nodigits:
672 			while (p > buf + 1)
673 				lungetc(*--p);
674 			c = *--p;
675 			if (c == '-')
676 				return (c);
677 		}
678 	}
679 
680 #define allowed_in_string(x) \
681 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
682 	x != '{' && x != '}' && \
683 	x != '!' && x != '=' && x != '#' && \
684 	x != ','))
685 
686 	if (isalnum(c) || c == ':' || c == '_') {
687 		do {
688 			*p++ = c;
689 			if ((unsigned)(p-buf) >= sizeof(buf)) {
690 				yyerror("string too long");
691 				return (findeol());
692 			}
693 			c = lgetc(0);
694 		} while (c != EOF && (allowed_in_string(c)));
695 		lungetc(c);
696 		*p = '\0';
697 		token = lookup(buf);
698 		if (token == STRING) {
699 			yylval.v.string = strdup(buf);
700 			if (yylval.v.string == NULL)
701 				err(1, "yylex: strdup");
702 		}
703 		return (token);
704 	}
705 	if (c == '\n') {
706 		yylval.lineno = file->lineno;
707 		file->lineno++;
708 	}
709 	if (c == EOF)
710 		return (0);
711 	return (c);
712 }
713 
714 int
715 check_file_secrecy(int fd, const char *fname)
716 {
717 	struct stat st;
718 
719 	if (fstat(fd, &st)) {
720 		log_warn("cannot stat %s", fname);
721 		return (-1);
722 	}
723 	if (st.st_uid != 0 && st.st_uid != getuid()) {
724 		log_warnx("%s: owner not root or current user", fname);
725 		return (-1);
726 	}
727 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
728 		log_warnx("%s: group writable or world read/writable", fname);
729 		return (-1);
730 	}
731 	return (0);
732 }
733 
734 struct file *
735 newfile(const char *name, int secret)
736 {
737 	struct file *nfile;
738 
739 	nfile = calloc(1, sizeof(struct file));
740 	if (nfile == NULL) {
741 		log_warn("calloc");
742 		return (NULL);
743 	}
744 	nfile->name = strdup(name);
745 	if (nfile->name == NULL) {
746 		log_warn("strdup");
747 		free(nfile);
748 		return (NULL);
749 	}
750 	nfile->stream = fopen(nfile->name, "r");
751 	if (nfile->stream == NULL) {
752 		/* no warning, we don't require a conf file */
753 		free(nfile->name);
754 		free(nfile);
755 		return (NULL);
756 	} else if (secret &&
757 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
758 		fclose(nfile->stream);
759 		free(nfile->name);
760 		free(nfile);
761 		return (NULL);
762 	}
763 	nfile->lineno = 1;
764 	return (nfile);
765 }
766 
767 static void
768 closefile(struct file *xfile)
769 {
770 	fclose(xfile->stream);
771 	free(xfile->name);
772 	free(xfile);
773 }
774 
775 static void
776 add_default_server(void)
777 {
778 	new_srv = conf_new_server(D_SITENAME);
779 	log_debug("%s: adding default server %s", __func__, D_SITENAME);
780 }
781 
782 int
783 parse_config(const char *filename, struct gotwebd *env)
784 {
785 	struct sym *sym, *next;
786 
787 	if (config_init(env) == -1)
788 		fatalx("failed to initialize configuration");
789 
790 	gotwebd = env;
791 
792 	file = newfile(filename, 0);
793 	if (file == NULL) {
794 		add_default_server();
795 		sockets_parse_sockets(env);
796 		/* just return, as we don't require a conf file */
797 		return (0);
798 	}
799 
800 	yyparse();
801 	errors = file->errors;
802 	closefile(file);
803 
804 	/* Free macros and check which have not been used. */
805 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
806 		if ((gotwebd->gotwebd_verbose > 1) && !sym->used)
807 			fprintf(stderr, "warning: macro '%s' not used\n",
808 			    sym->nam);
809 		if (!sym->persist) {
810 			free(sym->nam);
811 			free(sym->val);
812 			TAILQ_REMOVE(&symhead, sym, entry);
813 			free(sym);
814 		}
815 	}
816 
817 	if (errors)
818 		return (-1);
819 
820 	/* just add default server if no config specified */
821 	if (gotwebd->server_cnt == 0)
822 		add_default_server();
823 
824 	/* setup our listening sockets */
825 	sockets_parse_sockets(env);
826 
827 	return (0);
828 }
829 
830 struct server *
831 conf_new_server(const char *name)
832 {
833 	struct server *srv = NULL;
834 
835 	srv = calloc(1, sizeof(*srv));
836 	if (srv == NULL)
837 		fatalx("%s: calloc", __func__);
838 
839 	n = strlcpy(srv->name, name, sizeof(srv->name));
840 	if (n >= sizeof(srv->name))
841 		fatalx("%s: strlcpy", __func__);
842 	n = snprintf(srv->unix_socket_name,
843 	    sizeof(srv->unix_socket_name), "%s%s", D_HTTPD_CHROOT,
844 	    D_UNIX_SOCKET);
845 	if (n < 0 || (size_t)n >= sizeof(srv->unix_socket_name))
846 		fatalx("%s: snprintf", __func__);
847 	n = strlcpy(srv->repos_path, D_GOTPATH,
848 	    sizeof(srv->repos_path));
849 	if (n >= sizeof(srv->repos_path))
850 		fatalx("%s: strlcpy", __func__);
851 	n = strlcpy(srv->site_name, D_SITENAME,
852 	    sizeof(srv->site_name));
853 	if (n >= sizeof(srv->site_name))
854 		fatalx("%s: strlcpy", __func__);
855 	n = strlcpy(srv->site_owner, D_SITEOWNER,
856 	    sizeof(srv->site_owner));
857 	if (n >= sizeof(srv->site_owner))
858 		fatalx("%s: strlcpy", __func__);
859 	n = strlcpy(srv->site_link, D_SITELINK,
860 	    sizeof(srv->site_link));
861 	if (n >= sizeof(srv->site_link))
862 		fatalx("%s: strlcpy", __func__);
863 	n = strlcpy(srv->logo, D_GOTLOGO,
864 	    sizeof(srv->logo));
865 	if (n >= sizeof(srv->logo))
866 		fatalx("%s: strlcpy", __func__);
867 	n = strlcpy(srv->logo_url, D_GOTURL, sizeof(srv->logo_url));
868 	if (n >= sizeof(srv->logo_url))
869 		fatalx("%s: strlcpy", __func__);
870 	n = strlcpy(srv->custom_css, D_GOTWEBCSS, sizeof(srv->custom_css));
871 	if (n >= sizeof(srv->custom_css))
872 		fatalx("%s: strlcpy", __func__);
873 
874 	srv->show_site_owner = D_SHOWSOWNER;
875 	srv->show_repo_owner = D_SHOWROWNER;
876 	srv->show_repo_age = D_SHOWAGE;
877 	srv->show_repo_description = D_SHOWDESC;
878 	srv->show_repo_cloneurl = D_SHOWURL;
879 
880 	srv->max_repos_display = D_MAXREPODISP;
881 	srv->max_commits_display = D_MAXCOMMITDISP;
882 	srv->max_repos = D_MAXREPO;
883 
884 	srv->unix_socket = 1;
885 	srv->fcgi_socket = 0;
886 
887 	TAILQ_INIT(&srv->al);
888 	TAILQ_INSERT_TAIL(&gotwebd->servers, srv, entry);
889 	gotwebd->server_cnt++;
890 
891 	return srv;
892 };
893 
894 int
895 symset(const char *nam, const char *val, int persist)
896 {
897 	struct sym *sym;
898 
899 	TAILQ_FOREACH(sym, &symhead, entry) {
900 		if (strcmp(nam, sym->nam) == 0)
901 			break;
902 	}
903 
904 	if (sym != NULL) {
905 		if (sym->persist == 1)
906 			return (0);
907 		else {
908 			free(sym->nam);
909 			free(sym->val);
910 			TAILQ_REMOVE(&symhead, sym, entry);
911 			free(sym);
912 		}
913 	}
914 	sym = calloc(1, sizeof(*sym));
915 	if (sym == NULL)
916 		return (-1);
917 
918 	sym->nam = strdup(nam);
919 	if (sym->nam == NULL) {
920 		free(sym);
921 		return (-1);
922 	}
923 	sym->val = strdup(val);
924 	if (sym->val == NULL) {
925 		free(sym->nam);
926 		free(sym);
927 		return (-1);
928 	}
929 	sym->used = 0;
930 	sym->persist = persist;
931 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
932 	return (0);
933 }
934 
935 int
936 cmdline_symset(char *s)
937 {
938 	char *sym, *val;
939 	int ret;
940 
941 	val = strrchr(s, '=');
942 	if (val == NULL)
943 		return (-1);
944 
945 	sym = strndup(s, val - s);
946 	if (sym == NULL)
947 		fatal("%s: strndup", __func__);
948 
949 	ret = symset(sym, val + 1, 1);
950 	free(sym);
951 
952 	return (ret);
953 }
954 
955 char *
956 symget(const char *nam)
957 {
958 	struct sym *sym;
959 
960 	TAILQ_FOREACH(sym, &symhead, entry) {
961 		if (strcmp(nam, sym->nam) == 0) {
962 			sym->used = 1;
963 			return (sym->val);
964 		}
965 	}
966 	return (NULL);
967 }
968 
969 int
970 getservice(const char *n)
971 {
972 	struct servent *s;
973 	const char *errstr;
974 	long long llval;
975 
976 	llval = strtonum(n, 0, UINT16_MAX, &errstr);
977 	if (errstr) {
978 		s = getservbyname(n, "tcp");
979 		if (s == NULL)
980 			s = getservbyname(n, "udp");
981 		if (s == NULL)
982 			return (-1);
983 		return ntohs(s->s_port);
984 	}
985 
986 	return (unsigned short)llval;
987 }
988 
989 struct address *
990 host_v4(const char *s)
991 {
992 	struct in_addr ina;
993 	struct sockaddr_in *sain;
994 	struct address *h;
995 
996 	memset(&ina, 0, sizeof(ina));
997 	if (inet_pton(AF_INET, s, &ina) != 1)
998 		return (NULL);
999 
1000 	if ((h = calloc(1, sizeof(*h))) == NULL)
1001 		fatal(__func__);
1002 	sain = (struct sockaddr_in *)&h->ss;
1003 	got_sockaddr_inet_init(sain, &ina);
1004 	if (sain->sin_addr.s_addr == INADDR_ANY)
1005 		h->prefixlen = 0; /* 0.0.0.0 address */
1006 	else
1007 		h->prefixlen = -1; /* host address */
1008 	return (h);
1009 }
1010 
1011 struct address *
1012 host_v6(const char *s)
1013 {
1014 	struct addrinfo hints, *res;
1015 	struct sockaddr_in6 *sa_in6, *ra;
1016 	struct address *h = NULL;
1017 
1018 	memset(&hints, 0, sizeof(hints));
1019 	hints.ai_family = AF_INET6;
1020 	hints.ai_socktype = SOCK_DGRAM; /* dummy */
1021 	hints.ai_flags = AI_NUMERICHOST;
1022 	if (getaddrinfo(s, "0", &hints, &res) == 0) {
1023 		if ((h = calloc(1, sizeof(*h))) == NULL)
1024 			fatal(__func__);
1025 		sa_in6 = (struct sockaddr_in6 *)&h->ss;
1026 		ra = (struct sockaddr_in6 *)res->ai_addr;
1027 		got_sockaddr_inet6_init(sa_in6, &ra->sin6_addr,
1028 		    ra->sin6_scope_id);
1029 		if (memcmp(&sa_in6->sin6_addr, &in6addr_any,
1030 		    sizeof(sa_in6->sin6_addr)) == 0)
1031 			h->prefixlen = 0; /* any address */
1032 		else
1033 			h->prefixlen = -1; /* host address */
1034 		freeaddrinfo(res);
1035 	}
1036 
1037 	return (h);
1038 }
1039 
1040 int
1041 host_dns(const char *s, struct server *new_srv, int max,
1042     in_port_t port, const char *ifname, int ipproto)
1043 {
1044 	struct addrinfo hints, *res0, *res;
1045 	int error, cnt = 0;
1046 	struct sockaddr_in *sain;
1047 	struct sockaddr_in6 *sin6;
1048 	struct address *h;
1049 
1050 	if ((cnt = host_if(s, new_srv, max, port, ifname, ipproto)) != 0)
1051 		return (cnt);
1052 
1053 	memset(&hints, 0, sizeof(hints));
1054 	hints.ai_family = PF_UNSPEC;
1055 	hints.ai_socktype = SOCK_DGRAM; /* DUMMY */
1056 	hints.ai_flags = AI_ADDRCONFIG;
1057 	error = getaddrinfo(s, NULL, &hints, &res0);
1058 	if (error == EAI_AGAIN || error == EAI_NODATA || error == EAI_NONAME)
1059 		return (0);
1060 	if (error) {
1061 		log_warnx("%s: could not parse \"%s\": %s", __func__, s,
1062 		    gai_strerror(error));
1063 		return (-1);
1064 	}
1065 
1066 	for (res = res0; res && cnt < max; res = res->ai_next) {
1067 		if (res->ai_family != AF_INET &&
1068 		    res->ai_family != AF_INET6)
1069 			continue;
1070 		if ((h = calloc(1, sizeof(*h))) == NULL)
1071 			fatal(__func__);
1072 
1073 		if (port)
1074 			h->port = port;
1075 		if (ifname != NULL) {
1076 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1077 			    sizeof(h->ifname)) {
1078 				log_warnx("%s: interface name truncated",
1079 				    __func__);
1080 				freeaddrinfo(res0);
1081 				free(h);
1082 				return (-1);
1083 			}
1084 		}
1085 		if (ipproto != -1)
1086 			h->ipproto = ipproto;
1087 		h->ss.ss_family = res->ai_family;
1088 		h->prefixlen = -1; /* host address */
1089 
1090 		if (res->ai_family == AF_INET) {
1091 			struct sockaddr_in *ra;
1092 			sain = (struct sockaddr_in *)&h->ss;
1093 			ra = (struct sockaddr_in *)res->ai_addr;
1094 			got_sockaddr_inet_init(sain, &ra->sin_addr);
1095 		} else {
1096 			struct sockaddr_in6 *ra;
1097 			sin6 = (struct sockaddr_in6 *)&h->ss;
1098 			ra = (struct sockaddr_in6 *)res->ai_addr;
1099 			got_sockaddr_inet6_init(sin6, &ra->sin6_addr, 0);
1100 		}
1101 
1102 		if (add_addr(new_srv, h))
1103 			return -1;
1104 		cnt++;
1105 	}
1106 	if (cnt == max && res) {
1107 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1108 		    s, max);
1109 	}
1110 	freeaddrinfo(res0);
1111 	return (cnt);
1112 }
1113 
1114 int
1115 host_if(const char *s, struct server *new_srv, int max,
1116     in_port_t port, const char *ifname, int ipproto)
1117 {
1118 	struct ifaddrs *ifap, *p;
1119 	struct sockaddr_in *sain;
1120 	struct sockaddr_in6 *sin6;
1121 	struct address *h;
1122 	int cnt = 0, af;
1123 
1124 	if (getifaddrs(&ifap) == -1)
1125 		fatal("getifaddrs");
1126 
1127 	/* First search for IPv4 addresses */
1128 	af = AF_INET;
1129 
1130  nextaf:
1131 	for (p = ifap; p != NULL && cnt < max; p = p->ifa_next) {
1132 		if (p->ifa_addr == NULL ||
1133 		    p->ifa_addr->sa_family != af ||
1134 		    (strcmp(s, p->ifa_name) != 0 &&
1135 		    !is_if_in_group(p->ifa_name, s)))
1136 			continue;
1137 		if ((h = calloc(1, sizeof(*h))) == NULL)
1138 			fatal("calloc");
1139 
1140 		if (port)
1141 			h->port = port;
1142 		if (ifname != NULL) {
1143 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1144 			    sizeof(h->ifname)) {
1145 				log_warnx("%s: interface name truncated",
1146 				    __func__);
1147 				free(h);
1148 				freeifaddrs(ifap);
1149 				return (-1);
1150 			}
1151 		}
1152 		if (ipproto != -1)
1153 			h->ipproto = ipproto;
1154 		h->ss.ss_family = af;
1155 		h->prefixlen = -1; /* host address */
1156 
1157 		if (af == AF_INET) {
1158 			struct sockaddr_in *ra;
1159 			sain = (struct sockaddr_in *)&h->ss;
1160 			ra = (struct sockaddr_in *)p->ifa_addr;
1161 			got_sockaddr_inet_init(sain, &ra->sin_addr);
1162 		} else {
1163 			struct sockaddr_in6 *ra;
1164 			sin6 = (struct sockaddr_in6 *)&h->ss;
1165 			ra = (struct sockaddr_in6 *)p->ifa_addr;
1166 			got_sockaddr_inet6_init(sin6, &ra->sin6_addr,
1167 			    ra->sin6_scope_id);
1168 		}
1169 
1170 		if (add_addr(new_srv, h))
1171 			return -1;
1172 		cnt++;
1173 	}
1174 	if (af == AF_INET) {
1175 		/* Next search for IPv6 addresses */
1176 		af = AF_INET6;
1177 		goto nextaf;
1178 	}
1179 
1180 	if (cnt > max) {
1181 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1182 		    s, max);
1183 	}
1184 	freeifaddrs(ifap);
1185 	return (cnt);
1186 }
1187 
1188 int
1189 host(const char *s, struct server *new_srv, int max,
1190     in_port_t port, const char *ifname, int ipproto)
1191 {
1192 	struct address *h;
1193 
1194 	h = host_v4(s);
1195 
1196 	/* IPv6 address? */
1197 	if (h == NULL)
1198 		h = host_v6(s);
1199 
1200 	if (h != NULL) {
1201 		if (port)
1202 			h->port = port;
1203 		if (ifname != NULL) {
1204 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1205 			    sizeof(h->ifname)) {
1206 				log_warnx("%s: interface name truncated",
1207 				    __func__);
1208 				free(h);
1209 				return (-1);
1210 			}
1211 		}
1212 		if (ipproto != -1)
1213 			h->ipproto = ipproto;
1214 
1215 		if (add_addr(new_srv, h))
1216 			return -1;
1217 		return (1);
1218 	}
1219 
1220 	return (host_dns(s, new_srv, max, port, ifname, ipproto));
1221 }
1222 
1223 int
1224 is_if_in_group(const char *ifname, const char *groupname)
1225 {
1226 /* TA: Check this... */
1227 #ifdef HAVE_STRUCT_IFGROUPREQ
1228 	unsigned int len;
1229 	struct ifgroupreq ifgr;
1230 	struct ifg_req *ifg;
1231 	int s;
1232 	int ret = 0;
1233 
1234 	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
1235 		err(1, "socket");
1236 
1237 	memset(&ifgr, 0, sizeof(ifgr));
1238 	if (strlcpy(ifgr.ifgr_name, ifname, IFNAMSIZ) >= IFNAMSIZ)
1239 		err(1, "IFNAMSIZ");
1240 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1) {
1241 		if (errno == EINVAL || errno == ENOTTY)
1242 			goto end;
1243 		err(1, "SIOCGIFGROUP");
1244 	}
1245 
1246 	len = ifgr.ifgr_len;
1247 	ifgr.ifgr_groups = calloc(len / sizeof(struct ifg_req),
1248 	    sizeof(struct ifg_req));
1249 	if (ifgr.ifgr_groups == NULL)
1250 		err(1, "getifgroups");
1251 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1)
1252 		err(1, "SIOCGIFGROUP");
1253 
1254 	ifg = ifgr.ifgr_groups;
1255 	for (; ifg && len >= sizeof(struct ifg_req); ifg++) {
1256 		len -= sizeof(struct ifg_req);
1257 		if (strcmp(ifg->ifgrq_group, groupname) == 0) {
1258 			ret = 1;
1259 			break;
1260 		}
1261 	}
1262 	free(ifgr.ifgr_groups);
1263 
1264 end:
1265 	close(s);
1266 	return (ret);
1267 #else
1268 	return (0);
1269 #endif
1270 }
1271 
1272 int
1273 get_addrs(const char *addr, struct server *new_srv, in_port_t port)
1274 {
1275 	if (strcmp("", addr) == 0) {
1276 		if (host("127.0.0.1", new_srv, 1, port, "127.0.0.1",
1277 		    -1) <= 0) {
1278 			yyerror("invalid listen ip: %s",
1279 			    "127.0.0.1");
1280 			return (-1);
1281 		}
1282 		if (host("::1", new_srv, 1, port, "::1", -1) <= 0) {
1283 			yyerror("invalid listen ip: %s", "::1");
1284 			return (-1);
1285 		}
1286 	} else {
1287 		if (host(addr, new_srv, GOTWEBD_MAXIFACE, port, addr,
1288 		    -1) <= 0) {
1289 			yyerror("invalid listen ip: %s", addr);
1290 			return (-1);
1291 		}
1292 	}
1293 	return (0);
1294 }
1295 
1296 int
1297 addr_dup_check(struct addresslist *al, struct address *h, const char *new_srv,
1298     const char *other_srv)
1299 {
1300 	struct address *a;
1301 	void *ia;
1302 	char buf[INET6_ADDRSTRLEN];
1303 	const char *addrstr;
1304 
1305 	TAILQ_FOREACH(a, al, entry) {
1306 		if (memcmp(&a->ss, &h->ss, sizeof(h->ss)) != 0 ||
1307 		    a->port != h->port)
1308 			continue;
1309 
1310 		switch (h->ss.ss_family) {
1311 		case AF_INET:
1312 			ia = &((struct sockaddr_in *)(&h->ss))->sin_addr;
1313 			break;
1314 		case AF_INET6:
1315 			ia = &((struct sockaddr_in6 *)(&h->ss))->sin6_addr;
1316 			break;
1317 		default:
1318 			yyerror("unknown address family: %d", h->ss.ss_family);
1319 			return -1;
1320 		}
1321 		addrstr = inet_ntop(h->ss.ss_family, ia, buf, sizeof(buf));
1322 		if (addrstr) {
1323 			if (other_srv) {
1324 				yyerror("server %s: duplicate fcgi listen "
1325 				    "address %s:%d, already used by server %s",
1326 				    new_srv, addrstr, h->port, other_srv);
1327 			} else {
1328 				log_warnx("server: %s: duplicate fcgi listen "
1329 				    "address %s:%d", new_srv, addrstr, h->port);
1330 			}
1331 		} else {
1332 			if (other_srv) {
1333 				yyerror("server: %s: duplicate fcgi listen "
1334 				    "address, already used by server %s",
1335 				    new_srv, other_srv);
1336 			} else {
1337 				log_warnx("server %s: duplicate fcgi listen "
1338 				    "address", new_srv);
1339 			}
1340 		}
1341 
1342 		return -1;
1343 	}
1344 
1345 	return 0;
1346 }
1347 
1348 int
1349 add_addr(struct server *new_srv, struct address *h)
1350 {
1351 	struct server *srv;
1352 
1353 	/* Address cannot be shared between different servers. */
1354 	TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
1355 		if (srv == new_srv)
1356 			continue;
1357 		if (addr_dup_check(&srv->al, h, new_srv->name, srv->name))
1358 			return -1;
1359 	}
1360 
1361 	/* Tolerate duplicate address lines within the scope of a server. */
1362 	if (addr_dup_check(&new_srv->al, h, NULL, NULL) == 0)
1363 		TAILQ_INSERT_TAIL(&new_srv->al, h, entry);
1364 	else
1365 		free(h);
1366 
1367 	return 0;
1368 }