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