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