1 /*
2  * Copyright (c) 2016-2019, 2020-2021 Tracey Emery <tracey@traceyemery.net>
3  * Copyright (c) 2004, 2005 Esben Norby <norby@openbsd.org>
4  * Copyright (c) 2004 Ryan McBride <mcbride@openbsd.org>
5  * Copyright (c) 2002, 2003, 2004 Henning Brauer <henning@openbsd.org>
6  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
7  * Copyright (c) 2001 Daniel Hartmeier.  All rights reserved.
8  * Copyright (c) 2001 Theo de Raadt.  All rights reserved.
9  *
10  * Permission to use, copy, modify, and distribute this software for any
11  * purpose with or without fee is hereby granted, provided that the above
12  * copyright notice and this permission notice appear in all copies.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
15  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
16  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
17  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
18  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
19  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
20  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21  */
22 
23 %{
24 #include <sys/ioctl.h>
25 #include <sys/types.h>
26 #include <sys/queue.h>
27 #include <sys/socket.h>
28 #include <sys/stat.h>
29 
30 #include <net/if.h>
31 #include <netinet/in.h>
32 
33 #include <arpa/inet.h>
34 
35 #include <ctype.h>
36 #include <err.h>
37 #include <errno.h>
38 #include <event.h>
39 #include <ifaddrs.h>
40 #include <imsg.h>
41 #include <limits.h>
42 #include <netdb.h>
43 #include <stdarg.h>
44 #include <stdlib.h>
45 #include <stdio.h>
46 #include <string.h>
47 #include <syslog.h>
48 #include <unistd.h>
49 
50 #include "proc.h"
51 #include "gotwebd.h"
52 #include "got_sockaddr.h"
53 
54 TAILQ_HEAD(files, file)		 files = TAILQ_HEAD_INITIALIZER(files);
55 static struct file {
56 	TAILQ_ENTRY(file)	 entry;
57 	FILE			*stream;
58 	char			*name;
59 	int			 lineno;
60 	int			 errors;
61 } *file;
62 struct file	*newfile(const char *, int);
63 static void	 closefile(struct file *);
64 int		 check_file_secrecy(int, const char *);
65 int		 yyparse(void);
66 int		 yylex(void);
67 int		 yyerror(const char *, ...)
68     __attribute__((__format__ (printf, 1, 2)))
69     __attribute__((__nonnull__ (1)));
70 int		 kw_cmp(const void *, const void *);
71 int		 lookup(char *);
72 int		 lgetc(int);
73 int		 lungetc(int);
74 int		 findeol(void);
75 
76 TAILQ_HEAD(symhead, sym)	 symhead = TAILQ_HEAD_INITIALIZER(symhead);
77 struct sym {
78 	TAILQ_ENTRY(sym)	 entry;
79 	int			 used;
80 	int			 persist;
81 	char			*nam;
82 	char			*val;
83 };
84 
85 int	 symset(const char *, const char *, int);
86 char	*symget(const char *);
87 
88 static int		 errors;
89 
90 static struct gotwebd		*gotwebd;
91 static struct server		*new_srv;
92 static struct server		*conf_new_server(const char *);
93 int				 getservice(const char *);
94 int				 n;
95 
96 int		 get_addrs(const char *, struct server *, in_port_t);
97 int		 addr_dup_check(struct addresslist *, struct address *,
98 		    const char *, const char *);
99 int		 add_addr(struct server *, struct address *);
100 struct address	*host_v4(const char *);
101 struct address	*host_v6(const char *);
102 int		 host_dns(const char *, struct server *,
103 		    int, in_port_t, const char *, int);
104 int		 host_if(const char *, struct server *,
105 		    int, in_port_t, const char *, int);
106 int		 host(const char *, struct server *,
107 		    int, in_port_t, const char *, int);
108 int		 is_if_in_group(const char *, const char *);
109 
110 typedef struct {
111 	union {
112 		long long	 number;
113 		char		*string;
114 		in_port_t	 port;
115 	} v;
116 	int lineno;
117 } YYSTYPE;
118 
119 %}
120 
121 %token	LISTEN WWW_PATH MAX_REPOS SITE_NAME SITE_OWNER SITE_LINK LOGO
122 %token	LOGO_URL SHOW_REPO_OWNER SHOW_REPO_AGE SHOW_REPO_DESCRIPTION
123 %token	MAX_REPOS_DISPLAY REPOS_PATH MAX_COMMITS_DISPLAY ON ERROR
124 %token	SHOW_SITE_OWNER SHOW_REPO_CLONEURL PORT PREFORK RESPECT_EXPORTOK
125 %token	UNIX_SOCKET UNIX_SOCKET_NAME SERVER CHROOT CUSTOM_CSS
126 
127 %token	<v.string>	STRING
128 %type	<v.port>	fcgiport
129 %token	<v.number>	NUMBER
130 %type	<v.number>	boolean
131 
132 %%
133 
134 grammar		: /* empty */
135 		| grammar '\n'
136 		| grammar varset '\n'
137 		| grammar main '\n'
138 		| grammar server '\n'
139 		| grammar error '\n'		{ file->errors++; }
140 		;
141 
142 varset		: STRING '=' STRING	{
143 			char *s = $1;
144 			while (*s++) {
145 				if (isspace((unsigned char)*s)) {
146 					yyerror("macro name cannot contain "
147 					    "whitespace");
148 					free($1);
149 					free($3);
150 					YYERROR;
151 				}
152 			}
153 			if (symset($1, $3, 0) == -1)
154 				fatal("cannot store variable");
155 			free($1);
156 			free($3);
157 		}
158 		;
159 
160 boolean		: STRING {
161 			if (strcasecmp($1, "1") == 0 ||
162 			    strcasecmp($1, "yes") == 0 ||
163 			    strcasecmp($1, "on") == 0)
164 				$$ = 1;
165 			else if (strcasecmp($1, "0") == 0 ||
166 			    strcasecmp($1, "off") == 0 ||
167 			    strcasecmp($1, "no") == 0)
168 				$$ = 0;
169 			else {
170 				yyerror("invalid boolean value '%s'", $1);
171 				free($1);
172 				YYERROR;
173 			}
174 			free($1);
175 		}
176 		| ON { $$ = 1; }
177 		| NUMBER { $$ = $1; }
178 		;
179 
180 fcgiport	: PORT NUMBER {
181 			if ($2 <= 0 || $2 > (int)USHRT_MAX) {
182 				yyerror("invalid port: %lld", $2);
183 				YYERROR;
184 			}
185 			$$ = $2;
186 		}
187 		| PORT STRING {
188 			int	 val;
189 
190 			if ((val = getservice($2)) == -1) {
191 				yyerror("invalid port: %s", $2);
192 				free($2);
193 				YYERROR;
194 			}
195 			free($2);
196 
197 			$$ = val;
198 		}
199 		;
200 
201 main		: PREFORK NUMBER {
202 			gotwebd->prefork_gotwebd = $2;
203 		}
204 		| CHROOT STRING {
205 			n = strlcpy(gotwebd->httpd_chroot, $2,
206 			    sizeof(gotwebd->httpd_chroot));
207 			if (n >= sizeof(gotwebd->httpd_chroot)) {
208 				yyerror("%s: httpd_chroot truncated", __func__);
209 				free($2);
210 				YYERROR;
211 			}
212 			free($2);
213 		}
214 		| UNIX_SOCKET boolean {
215 			gotwebd->unix_socket = $2;
216 		}
217 		| UNIX_SOCKET_NAME STRING {
218 			n = snprintf(gotwebd->unix_socket_name,
219 			    sizeof(gotwebd->unix_socket_name), "%s%s",
220 			    strlen(gotwebd->httpd_chroot) ?
221 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $2);
222 			if (n < 0 ||
223 			    (size_t)n >= sizeof(gotwebd->unix_socket_name)) {
224 				yyerror("%s: unix_socket_name truncated",
225 				    __func__);
226 				free($2);
227 				YYERROR;
228 			}
229 			free($2);
230 		}
231 		;
232 
233 server		: SERVER STRING {
234 			struct server *srv;
235 
236 			TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
237 				if (strcmp(srv->name, $2) == 0) {
238 					yyerror("server name exists '%s'", $2);
239 					free($2);
240 					YYERROR;
241 				}
242 			}
243 
244 			new_srv = conf_new_server($2);
245 			log_debug("adding server %s", $2);
246 			free($2);
247 		}
248 		| SERVER STRING {
249 			struct server *srv;
250 
251 			TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
252 				if (strcmp(srv->name, $2) == 0) {
253 					yyerror("server name exists '%s'", $2);
254 					free($2);
255 					YYERROR;
256 				}
257 			}
258 
259 			new_srv = conf_new_server($2);
260 			log_debug("adding server %s", $2);
261 			free($2);
262 		} '{' optnl serveropts2 '}' {
263 		}
264 		;
265 
266 serveropts1	: REPOS_PATH STRING {
267 			n = strlcpy(new_srv->repos_path, $2,
268 			    sizeof(new_srv->repos_path));
269 			if (n >= sizeof(new_srv->repos_path)) {
270 				yyerror("%s: repos_path truncated", __func__);
271 				free($2);
272 				YYERROR;
273 			}
274 			free($2);
275 		}
276 		| SITE_NAME STRING {
277 			n = strlcpy(new_srv->site_name, $2,
278 			    sizeof(new_srv->site_name));
279 			if (n >= sizeof(new_srv->site_name)) {
280 				yyerror("%s: site_name truncated", __func__);
281 				free($2);
282 				YYERROR;
283 			}
284 			free($2);
285 		}
286 		| SITE_OWNER STRING {
287 			n = strlcpy(new_srv->site_owner, $2,
288 			    sizeof(new_srv->site_owner));
289 			if (n >= sizeof(new_srv->site_owner)) {
290 				yyerror("%s: site_owner truncated", __func__);
291 				free($2);
292 				YYERROR;
293 			}
294 			free($2);
295 		}
296 		| SITE_LINK STRING {
297 			n = strlcpy(new_srv->site_link, $2,
298 			    sizeof(new_srv->site_link));
299 			if (n >= sizeof(new_srv->site_link)) {
300 				yyerror("%s: site_link truncated", __func__);
301 				free($2);
302 				YYERROR;
303 			}
304 			free($2);
305 		}
306 		| LOGO STRING {
307 			n = strlcpy(new_srv->logo, $2, sizeof(new_srv->logo));
308 			if (n >= sizeof(new_srv->logo)) {
309 				yyerror("%s: logo truncated", __func__);
310 				free($2);
311 				YYERROR;
312 			}
313 			free($2);
314 		}
315 		| LOGO_URL STRING {
316 			n = strlcpy(new_srv->logo_url, $2,
317 			    sizeof(new_srv->logo_url));
318 			if (n >= sizeof(new_srv->logo_url)) {
319 				yyerror("%s: logo_url truncated", __func__);
320 				free($2);
321 				YYERROR;
322 			}
323 			free($2);
324 		}
325 		| CUSTOM_CSS STRING {
326 			n = strlcpy(new_srv->custom_css, $2,
327 			    sizeof(new_srv->custom_css));
328 			if (n >= sizeof(new_srv->custom_css)) {
329 				yyerror("%s: custom_css truncated", __func__);
330 				free($2);
331 				YYERROR;
332 			}
333 			free($2);
334 		}
335 		| LISTEN ON STRING fcgiport {
336 			if (get_addrs($3, new_srv, $4) == -1) {
337 				yyerror("could not get addrs");
338 				YYERROR;
339 			}
340 			new_srv->fcgi_socket = 1;
341 		}
342 		| MAX_REPOS NUMBER {
343 			if ($2 > 0)
344 				new_srv->max_repos = $2;
345 		}
346 		| SHOW_SITE_OWNER boolean {
347 			new_srv->show_site_owner = $2;
348 		}
349 		| SHOW_REPO_OWNER boolean {
350 			new_srv->show_repo_owner = $2;
351 		}
352 		| SHOW_REPO_AGE boolean {
353 			new_srv->show_repo_age = $2;
354 		}
355 		| SHOW_REPO_DESCRIPTION boolean {
356 			new_srv->show_repo_description = $2;
357 		}
358 		| SHOW_REPO_CLONEURL boolean {
359 			new_srv->show_repo_cloneurl = $2;
360 		}
361 		| RESPECT_EXPORTOK boolean {
362 			new_srv->respect_exportok = $2;
363 		}
364 		| MAX_REPOS_DISPLAY NUMBER {
365 				new_srv->max_repos_display = $2;
366 		}
367 		| MAX_COMMITS_DISPLAY NUMBER {
368 			if ($2 > 0)
369 				new_srv->max_commits_display = $2;
370 		}
371 		| UNIX_SOCKET boolean {
372 			new_srv->unix_socket = $2;
373 		}
374 		| UNIX_SOCKET_NAME STRING {
375 			n = snprintf(new_srv->unix_socket_name,
376 			    sizeof(new_srv->unix_socket_name), "%s%s",
377 			    strlen(gotwebd->httpd_chroot) ?
378 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $2);
379 			if (n < 0 ||
380 			    (size_t)n >= sizeof(new_srv->unix_socket_name)) {
381 				yyerror("%s: unix_socket_name truncated",
382 				    __func__);
383 				free($2);
384 				YYERROR;
385 			}
386 			free($2);
387 		}
388 		;
389 
390 serveropts2	: serveropts2 serveropts1 nl
391 		| serveropts1 optnl
392 		;
393 
394 nl		: '\n' optnl
395 		;
396 
397 optnl		: '\n' optnl		/* zero or more newlines */
398 		| /* empty */
399 		;
400 
401 %%
402 
403 struct keywords {
404 	const char	*k_name;
405 	int		 k_val;
406 };
407 
408 int
409 yyerror(const char *fmt, ...)
410 {
411 	va_list ap;
412 	char *msg;
413 
414 	file->errors++;
415 	va_start(ap, fmt);
416 	if (vasprintf(&msg, fmt, ap) == -1)
417 		fatalx("yyerror vasprintf");
418 	va_end(ap);
419 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
420 	free(msg);
421 	return (0);
422 }
423 
424 int
425 kw_cmp(const void *k, const void *e)
426 {
427 	return (strcmp(k, ((const struct keywords *)e)->k_name));
428 }
429 
430 int
431 lookup(char *s)
432 {
433 	/* This has to be sorted always. */
434 	static const struct keywords keywords[] = {
435 		{ "chroot",			CHROOT },
436 		{ "custom_css",			CUSTOM_CSS },
437 		{ "listen",			LISTEN },
438 		{ "logo",			LOGO },
439 		{ "logo_url"	,		LOGO_URL },
440 		{ "max_commits_display",	MAX_COMMITS_DISPLAY },
441 		{ "max_repos",			MAX_REPOS },
442 		{ "max_repos_display",		MAX_REPOS_DISPLAY },
443 		{ "on",				ON },
444 		{ "port",			PORT },
445 		{ "prefork",			PREFORK },
446 		{ "repos_path",			REPOS_PATH },
447 		{ "respect_exportok",		RESPECT_EXPORTOK },
448 		{ "server",			SERVER },
449 		{ "show_repo_age",		SHOW_REPO_AGE },
450 		{ "show_repo_cloneurl",		SHOW_REPO_CLONEURL },
451 		{ "show_repo_description",	SHOW_REPO_DESCRIPTION },
452 		{ "show_repo_owner",		SHOW_REPO_OWNER },
453 		{ "show_site_owner",		SHOW_SITE_OWNER },
454 		{ "site_link",			SITE_LINK },
455 		{ "site_name",			SITE_NAME },
456 		{ "site_owner",			SITE_OWNER },
457 		{ "unix_socket",		UNIX_SOCKET },
458 		{ "unix_socket_name",		UNIX_SOCKET_NAME },
459 	};
460 	const struct keywords *p;
461 
462 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
463 	    sizeof(keywords[0]), kw_cmp);
464 
465 	if (p)
466 		return (p->k_val);
467 	else
468 		return (STRING);
469 }
470 
471 #define MAXPUSHBACK	128
472 
473 unsigned char *parsebuf;
474 int parseindex;
475 unsigned char pushback_buffer[MAXPUSHBACK];
476 int pushback_index = 0;
477 
478 int
479 lgetc(int quotec)
480 {
481 	int c, next;
482 
483 	if (parsebuf) {
484 		/* Read character from the parsebuffer instead of input. */
485 		if (parseindex >= 0) {
486 			c = parsebuf[parseindex++];
487 			if (c != '\0')
488 				return (c);
489 			parsebuf = NULL;
490 		} else
491 			parseindex++;
492 	}
493 
494 	if (pushback_index)
495 		return (pushback_buffer[--pushback_index]);
496 
497 	if (quotec) {
498 		c = getc(file->stream);
499 		if (c == EOF)
500 			yyerror("reached end of file while parsing "
501 			    "quoted string");
502 		return (c);
503 	}
504 
505 	c = getc(file->stream);
506 	while (c == '\\') {
507 		next = getc(file->stream);
508 		if (next != '\n') {
509 			c = next;
510 			break;
511 		}
512 		yylval.lineno = file->lineno;
513 		file->lineno++;
514 		c = getc(file->stream);
515 	}
516 
517 	return (c);
518 }
519 
520 int
521 lungetc(int c)
522 {
523 	if (c == EOF)
524 		return (EOF);
525 	if (parsebuf) {
526 		parseindex--;
527 		if (parseindex >= 0)
528 			return (c);
529 	}
530 	if (pushback_index < MAXPUSHBACK-1)
531 		return (pushback_buffer[pushback_index++] = c);
532 	else
533 		return (EOF);
534 }
535 
536 int
537 findeol(void)
538 {
539 	int c;
540 
541 	parsebuf = NULL;
542 
543 	/* Skip to either EOF or the first real EOL. */
544 	while (1) {
545 		if (pushback_index)
546 			c = pushback_buffer[--pushback_index];
547 		else
548 			c = lgetc(0);
549 		if (c == '\n') {
550 			file->lineno++;
551 			break;
552 		}
553 		if (c == EOF)
554 			break;
555 	}
556 	return (ERROR);
557 }
558 
559 int
560 yylex(void)
561 {
562 	unsigned char buf[8096];
563 	unsigned char *p, *val;
564 	int quotec, next, c;
565 	int token;
566 
567 top:
568 	p = buf;
569 	c = lgetc(0);
570 	while (c == ' ' || c == '\t')
571 		c = lgetc(0); /* nothing */
572 
573 	yylval.lineno = file->lineno;
574 	if (c == '#') {
575 		c = lgetc(0);
576 		while (c != '\n' && c != EOF)
577 			c = lgetc(0); /* nothing */
578 	}
579 	if (c == '$' && parsebuf == NULL) {
580 		while (1) {
581 			c = lgetc(0);
582 			if (c == EOF)
583 				return (0);
584 
585 			if (p + 1 >= buf + sizeof(buf) - 1) {
586 				yyerror("string too long");
587 				return (findeol());
588 			}
589 			if (isalnum(c) || c == '_') {
590 				*p++ = c;
591 				continue;
592 			}
593 			*p = '\0';
594 			lungetc(c);
595 			break;
596 		}
597 		val = symget(buf);
598 		if (val == NULL) {
599 			yyerror("macro '%s' not defined", buf);
600 			return (findeol());
601 		}
602 		parsebuf = val;
603 		parseindex = 0;
604 		goto top;
605 	}
606 
607 	switch (c) {
608 	case '\'':
609 	case '"':
610 		quotec = c;
611 		while (1) {
612 			c = lgetc(quotec);
613 			if (c == EOF)
614 				return (0);
615 			if (c == '\n') {
616 				file->lineno++;
617 				continue;
618 			} else if (c == '\\') {
619 				next = lgetc(quotec);
620 				if (next == EOF)
621 					return (0);
622 				if (next == quotec || c == ' ' || c == '\t')
623 					c = next;
624 				else if (next == '\n') {
625 					file->lineno++;
626 					continue;
627 				} else
628 					lungetc(next);
629 			} else if (c == quotec) {
630 				*p = '\0';
631 				break;
632 			} else if (c == '\0') {
633 				yyerror("syntax error");
634 				return (findeol());
635 			}
636 			if (p + 1 >= buf + sizeof(buf) - 1) {
637 				yyerror("string too long");
638 				return (findeol());
639 			}
640 			*p++ = c;
641 		}
642 		yylval.v.string = strdup(buf);
643 		if (yylval.v.string == NULL)
644 			err(1, "yylex: strdup");
645 		return (STRING);
646 	}
647 
648 #define allowed_to_end_number(x) \
649 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
650 
651 	if (c == '-' || isdigit(c)) {
652 		do {
653 			*p++ = c;
654 			if ((unsigned)(p-buf) >= sizeof(buf)) {
655 				yyerror("string too long");
656 				return (findeol());
657 			}
658 			c = lgetc(0);
659 		} while (c != EOF && isdigit(c));
660 		lungetc(c);
661 		if (p == buf + 1 && buf[0] == '-')
662 			goto nodigits;
663 		if (c == EOF || allowed_to_end_number(c)) {
664 			const char *errstr = NULL;
665 
666 			*p = '\0';
667 			yylval.v.number = strtonum(buf, LLONG_MIN,
668 			    LLONG_MAX, &errstr);
669 			if (errstr) {
670 				yyerror("\"%s\" invalid number: %s",
671 				    buf, errstr);
672 				return (findeol());
673 			}
674 			return (NUMBER);
675 		} else {
676 nodigits:
677 			while (p > buf + 1)
678 				lungetc(*--p);
679 			c = *--p;
680 			if (c == '-')
681 				return (c);
682 		}
683 	}
684 
685 #define allowed_in_string(x) \
686 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
687 	x != '{' && x != '}' && \
688 	x != '!' && x != '=' && x != '#' && \
689 	x != ','))
690 
691 	if (isalnum(c) || c == ':' || c == '_') {
692 		do {
693 			*p++ = c;
694 			if ((unsigned)(p-buf) >= sizeof(buf)) {
695 				yyerror("string too long");
696 				return (findeol());
697 			}
698 			c = lgetc(0);
699 		} while (c != EOF && (allowed_in_string(c)));
700 		lungetc(c);
701 		*p = '\0';
702 		token = lookup(buf);
703 		if (token == STRING) {
704 			yylval.v.string = strdup(buf);
705 			if (yylval.v.string == NULL)
706 				err(1, "yylex: strdup");
707 		}
708 		return (token);
709 	}
710 	if (c == '\n') {
711 		yylval.lineno = file->lineno;
712 		file->lineno++;
713 	}
714 	if (c == EOF)
715 		return (0);
716 	return (c);
717 }
718 
719 int
720 check_file_secrecy(int fd, const char *fname)
721 {
722 	struct stat st;
723 
724 	if (fstat(fd, &st)) {
725 		log_warn("cannot stat %s", fname);
726 		return (-1);
727 	}
728 	if (st.st_uid != 0 && st.st_uid != getuid()) {
729 		log_warnx("%s: owner not root or current user", fname);
730 		return (-1);
731 	}
732 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
733 		log_warnx("%s: group writable or world read/writable", fname);
734 		return (-1);
735 	}
736 	return (0);
737 }
738 
739 struct file *
740 newfile(const char *name, int secret)
741 {
742 	struct file *nfile;
743 
744 	nfile = calloc(1, sizeof(struct file));
745 	if (nfile == NULL) {
746 		log_warn("calloc");
747 		return (NULL);
748 	}
749 	nfile->name = strdup(name);
750 	if (nfile->name == NULL) {
751 		log_warn("strdup");
752 		free(nfile);
753 		return (NULL);
754 	}
755 	nfile->stream = fopen(nfile->name, "r");
756 	if (nfile->stream == NULL) {
757 		/* no warning, we don't require a conf file */
758 		free(nfile->name);
759 		free(nfile);
760 		return (NULL);
761 	} else if (secret &&
762 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
763 		fclose(nfile->stream);
764 		free(nfile->name);
765 		free(nfile);
766 		return (NULL);
767 	}
768 	nfile->lineno = 1;
769 	return (nfile);
770 }
771 
772 static void
773 closefile(struct file *xfile)
774 {
775 	fclose(xfile->stream);
776 	free(xfile->name);
777 	free(xfile);
778 }
779 
780 static void
781 add_default_server(void)
782 {
783 	new_srv = conf_new_server(D_SITENAME);
784 	log_debug("%s: adding default server %s", __func__, D_SITENAME);
785 }
786 
787 int
788 parse_config(const char *filename, struct gotwebd *env)
789 {
790 	struct sym *sym, *next;
791 
792 	if (config_init(env) == -1)
793 		fatalx("failed to initialize configuration");
794 
795 	gotwebd = env;
796 
797 	file = newfile(filename, 0);
798 	if (file == NULL) {
799 		add_default_server();
800 		sockets_parse_sockets(env);
801 		/* just return, as we don't require a conf file */
802 		return (0);
803 	}
804 
805 	yyparse();
806 	errors = file->errors;
807 	closefile(file);
808 
809 	/* Free macros and check which have not been used. */
810 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
811 		if ((gotwebd->gotwebd_verbose > 1) && !sym->used)
812 			fprintf(stderr, "warning: macro '%s' not used\n",
813 			    sym->nam);
814 		if (!sym->persist) {
815 			free(sym->nam);
816 			free(sym->val);
817 			TAILQ_REMOVE(&symhead, sym, entry);
818 			free(sym);
819 		}
820 	}
821 
822 	if (errors)
823 		return (-1);
824 
825 	/* just add default server if no config specified */
826 	if (gotwebd->server_cnt == 0)
827 		add_default_server();
828 
829 	/* setup our listening sockets */
830 	sockets_parse_sockets(env);
831 
832 	return (0);
833 }
834 
835 struct server *
836 conf_new_server(const char *name)
837 {
838 	struct server *srv = NULL;
839 
840 	srv = calloc(1, sizeof(*srv));
841 	if (srv == NULL)
842 		fatalx("%s: calloc", __func__);
843 
844 	n = strlcpy(srv->name, name, sizeof(srv->name));
845 	if (n >= sizeof(srv->name))
846 		fatalx("%s: strlcpy", __func__);
847 	n = snprintf(srv->unix_socket_name,
848 	    sizeof(srv->unix_socket_name), "%s%s", D_HTTPD_CHROOT,
849 	    D_UNIX_SOCKET);
850 	if (n < 0 || (size_t)n >= sizeof(srv->unix_socket_name))
851 		fatalx("%s: snprintf", __func__);
852 	n = strlcpy(srv->repos_path, D_GOTPATH,
853 	    sizeof(srv->repos_path));
854 	if (n >= sizeof(srv->repos_path))
855 		fatalx("%s: strlcpy", __func__);
856 	n = strlcpy(srv->site_name, D_SITENAME,
857 	    sizeof(srv->site_name));
858 	if (n >= sizeof(srv->site_name))
859 		fatalx("%s: strlcpy", __func__);
860 	n = strlcpy(srv->site_owner, D_SITEOWNER,
861 	    sizeof(srv->site_owner));
862 	if (n >= sizeof(srv->site_owner))
863 		fatalx("%s: strlcpy", __func__);
864 	n = strlcpy(srv->site_link, D_SITELINK,
865 	    sizeof(srv->site_link));
866 	if (n >= sizeof(srv->site_link))
867 		fatalx("%s: strlcpy", __func__);
868 	n = strlcpy(srv->logo, D_GOTLOGO,
869 	    sizeof(srv->logo));
870 	if (n >= sizeof(srv->logo))
871 		fatalx("%s: strlcpy", __func__);
872 	n = strlcpy(srv->logo_url, D_GOTURL, sizeof(srv->logo_url));
873 	if (n >= sizeof(srv->logo_url))
874 		fatalx("%s: strlcpy", __func__);
875 	n = strlcpy(srv->custom_css, D_GOTWEBCSS, sizeof(srv->custom_css));
876 	if (n >= sizeof(srv->custom_css))
877 		fatalx("%s: strlcpy", __func__);
878 
879 	srv->show_site_owner = D_SHOWSOWNER;
880 	srv->show_repo_owner = D_SHOWROWNER;
881 	srv->show_repo_age = D_SHOWAGE;
882 	srv->show_repo_description = D_SHOWDESC;
883 	srv->show_repo_cloneurl = D_SHOWURL;
884 	srv->respect_exportok = D_RESPECTEXPORTOK;
885 
886 	srv->max_repos_display = D_MAXREPODISP;
887 	srv->max_commits_display = D_MAXCOMMITDISP;
888 	srv->max_repos = D_MAXREPO;
889 
890 	srv->unix_socket = 1;
891 	srv->fcgi_socket = 0;
892 
893 	TAILQ_INIT(&srv->al);
894 	TAILQ_INSERT_TAIL(&gotwebd->servers, srv, entry);
895 	gotwebd->server_cnt++;
896 
897 	return srv;
898 };
899 
900 int
901 symset(const char *nam, const char *val, int persist)
902 {
903 	struct sym *sym;
904 
905 	TAILQ_FOREACH(sym, &symhead, entry) {
906 		if (strcmp(nam, sym->nam) == 0)
907 			break;
908 	}
909 
910 	if (sym != NULL) {
911 		if (sym->persist == 1)
912 			return (0);
913 		else {
914 			free(sym->nam);
915 			free(sym->val);
916 			TAILQ_REMOVE(&symhead, sym, entry);
917 			free(sym);
918 		}
919 	}
920 	sym = calloc(1, sizeof(*sym));
921 	if (sym == NULL)
922 		return (-1);
923 
924 	sym->nam = strdup(nam);
925 	if (sym->nam == NULL) {
926 		free(sym);
927 		return (-1);
928 	}
929 	sym->val = strdup(val);
930 	if (sym->val == NULL) {
931 		free(sym->nam);
932 		free(sym);
933 		return (-1);
934 	}
935 	sym->used = 0;
936 	sym->persist = persist;
937 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
938 	return (0);
939 }
940 
941 int
942 cmdline_symset(char *s)
943 {
944 	char *sym, *val;
945 	int ret;
946 
947 	val = strrchr(s, '=');
948 	if (val == NULL)
949 		return (-1);
950 
951 	sym = strndup(s, val - s);
952 	if (sym == NULL)
953 		fatal("%s: strndup", __func__);
954 
955 	ret = symset(sym, val + 1, 1);
956 	free(sym);
957 
958 	return (ret);
959 }
960 
961 char *
962 symget(const char *nam)
963 {
964 	struct sym *sym;
965 
966 	TAILQ_FOREACH(sym, &symhead, entry) {
967 		if (strcmp(nam, sym->nam) == 0) {
968 			sym->used = 1;
969 			return (sym->val);
970 		}
971 	}
972 	return (NULL);
973 }
974 
975 int
976 getservice(const char *n)
977 {
978 	struct servent *s;
979 	const char *errstr;
980 	long long llval;
981 
982 	llval = strtonum(n, 0, UINT16_MAX, &errstr);
983 	if (errstr) {
984 		s = getservbyname(n, "tcp");
985 		if (s == NULL)
986 			s = getservbyname(n, "udp");
987 		if (s == NULL)
988 			return (-1);
989 		return ntohs(s->s_port);
990 	}
991 
992 	return (unsigned short)llval;
993 }
994 
995 struct address *
996 host_v4(const char *s)
997 {
998 	struct in_addr ina;
999 	struct sockaddr_in *sain;
1000 	struct address *h;
1001 
1002 	memset(&ina, 0, sizeof(ina));
1003 	if (inet_pton(AF_INET, s, &ina) != 1)
1004 		return (NULL);
1005 
1006 	if ((h = calloc(1, sizeof(*h))) == NULL)
1007 		fatal(__func__);
1008 	sain = (struct sockaddr_in *)&h->ss;
1009 	got_sockaddr_inet_init(sain, &ina);
1010 	if (sain->sin_addr.s_addr == INADDR_ANY)
1011 		h->prefixlen = 0; /* 0.0.0.0 address */
1012 	else
1013 		h->prefixlen = -1; /* host address */
1014 	return (h);
1015 }
1016 
1017 struct address *
1018 host_v6(const char *s)
1019 {
1020 	struct addrinfo hints, *res;
1021 	struct sockaddr_in6 *sa_in6, *ra;
1022 	struct address *h = NULL;
1023 
1024 	memset(&hints, 0, sizeof(hints));
1025 	hints.ai_family = AF_INET6;
1026 	hints.ai_socktype = SOCK_DGRAM; /* dummy */
1027 	hints.ai_flags = AI_NUMERICHOST;
1028 	if (getaddrinfo(s, "0", &hints, &res) == 0) {
1029 		if ((h = calloc(1, sizeof(*h))) == NULL)
1030 			fatal(__func__);
1031 		sa_in6 = (struct sockaddr_in6 *)&h->ss;
1032 		ra = (struct sockaddr_in6 *)res->ai_addr;
1033 		got_sockaddr_inet6_init(sa_in6, &ra->sin6_addr,
1034 		    ra->sin6_scope_id);
1035 		if (memcmp(&sa_in6->sin6_addr, &in6addr_any,
1036 		    sizeof(sa_in6->sin6_addr)) == 0)
1037 			h->prefixlen = 0; /* any address */
1038 		else
1039 			h->prefixlen = -1; /* host address */
1040 		freeaddrinfo(res);
1041 	}
1042 
1043 	return (h);
1044 }
1045 
1046 int
1047 host_dns(const char *s, struct server *new_srv, int max,
1048     in_port_t port, const char *ifname, int ipproto)
1049 {
1050 	struct addrinfo hints, *res0, *res;
1051 	int error, cnt = 0;
1052 	struct sockaddr_in *sain;
1053 	struct sockaddr_in6 *sin6;
1054 	struct address *h;
1055 
1056 	if ((cnt = host_if(s, new_srv, max, port, ifname, ipproto)) != 0)
1057 		return (cnt);
1058 
1059 	memset(&hints, 0, sizeof(hints));
1060 	hints.ai_family = PF_UNSPEC;
1061 	hints.ai_socktype = SOCK_DGRAM; /* DUMMY */
1062 	hints.ai_flags = AI_ADDRCONFIG;
1063 	error = getaddrinfo(s, NULL, &hints, &res0);
1064 	if (error == EAI_AGAIN || error == EAI_NODATA || error == EAI_NONAME)
1065 		return (0);
1066 	if (error) {
1067 		log_warnx("%s: could not parse \"%s\": %s", __func__, s,
1068 		    gai_strerror(error));
1069 		return (-1);
1070 	}
1071 
1072 	for (res = res0; res && cnt < max; res = res->ai_next) {
1073 		if (res->ai_family != AF_INET &&
1074 		    res->ai_family != AF_INET6)
1075 			continue;
1076 		if ((h = calloc(1, sizeof(*h))) == NULL)
1077 			fatal(__func__);
1078 
1079 		if (port)
1080 			h->port = port;
1081 		if (ifname != NULL) {
1082 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1083 			    sizeof(h->ifname)) {
1084 				log_warnx("%s: interface name truncated",
1085 				    __func__);
1086 				freeaddrinfo(res0);
1087 				free(h);
1088 				return (-1);
1089 			}
1090 		}
1091 		if (ipproto != -1)
1092 			h->ipproto = ipproto;
1093 		h->ss.ss_family = res->ai_family;
1094 		h->prefixlen = -1; /* host address */
1095 
1096 		if (res->ai_family == AF_INET) {
1097 			struct sockaddr_in *ra;
1098 			sain = (struct sockaddr_in *)&h->ss;
1099 			ra = (struct sockaddr_in *)res->ai_addr;
1100 			got_sockaddr_inet_init(sain, &ra->sin_addr);
1101 		} else {
1102 			struct sockaddr_in6 *ra;
1103 			sin6 = (struct sockaddr_in6 *)&h->ss;
1104 			ra = (struct sockaddr_in6 *)res->ai_addr;
1105 			got_sockaddr_inet6_init(sin6, &ra->sin6_addr, 0);
1106 		}
1107 
1108 		if (add_addr(new_srv, h))
1109 			return -1;
1110 		cnt++;
1111 	}
1112 	if (cnt == max && res) {
1113 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1114 		    s, max);
1115 	}
1116 	freeaddrinfo(res0);
1117 	return (cnt);
1118 }
1119 
1120 int
1121 host_if(const char *s, struct server *new_srv, int max,
1122     in_port_t port, const char *ifname, int ipproto)
1123 {
1124 	struct ifaddrs *ifap, *p;
1125 	struct sockaddr_in *sain;
1126 	struct sockaddr_in6 *sin6;
1127 	struct address *h;
1128 	int cnt = 0, af;
1129 
1130 	if (getifaddrs(&ifap) == -1)
1131 		fatal("getifaddrs");
1132 
1133 	/* First search for IPv4 addresses */
1134 	af = AF_INET;
1135 
1136  nextaf:
1137 	for (p = ifap; p != NULL && cnt < max; p = p->ifa_next) {
1138 		if (p->ifa_addr == NULL ||
1139 		    p->ifa_addr->sa_family != af ||
1140 		    (strcmp(s, p->ifa_name) != 0 &&
1141 		    !is_if_in_group(p->ifa_name, s)))
1142 			continue;
1143 		if ((h = calloc(1, sizeof(*h))) == NULL)
1144 			fatal("calloc");
1145 
1146 		if (port)
1147 			h->port = port;
1148 		if (ifname != NULL) {
1149 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1150 			    sizeof(h->ifname)) {
1151 				log_warnx("%s: interface name truncated",
1152 				    __func__);
1153 				free(h);
1154 				freeifaddrs(ifap);
1155 				return (-1);
1156 			}
1157 		}
1158 		if (ipproto != -1)
1159 			h->ipproto = ipproto;
1160 		h->ss.ss_family = af;
1161 		h->prefixlen = -1; /* host address */
1162 
1163 		if (af == AF_INET) {
1164 			struct sockaddr_in *ra;
1165 			sain = (struct sockaddr_in *)&h->ss;
1166 			ra = (struct sockaddr_in *)p->ifa_addr;
1167 			got_sockaddr_inet_init(sain, &ra->sin_addr);
1168 		} else {
1169 			struct sockaddr_in6 *ra;
1170 			sin6 = (struct sockaddr_in6 *)&h->ss;
1171 			ra = (struct sockaddr_in6 *)p->ifa_addr;
1172 			got_sockaddr_inet6_init(sin6, &ra->sin6_addr,
1173 			    ra->sin6_scope_id);
1174 		}
1175 
1176 		if (add_addr(new_srv, h))
1177 			return -1;
1178 		cnt++;
1179 	}
1180 	if (af == AF_INET) {
1181 		/* Next search for IPv6 addresses */
1182 		af = AF_INET6;
1183 		goto nextaf;
1184 	}
1185 
1186 	if (cnt > max) {
1187 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1188 		    s, max);
1189 	}
1190 	freeifaddrs(ifap);
1191 	return (cnt);
1192 }
1193 
1194 int
1195 host(const char *s, struct server *new_srv, int max,
1196     in_port_t port, const char *ifname, int ipproto)
1197 {
1198 	struct address *h;
1199 
1200 	h = host_v4(s);
1201 
1202 	/* IPv6 address? */
1203 	if (h == NULL)
1204 		h = host_v6(s);
1205 
1206 	if (h != NULL) {
1207 		if (port)
1208 			h->port = port;
1209 		if (ifname != NULL) {
1210 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1211 			    sizeof(h->ifname)) {
1212 				log_warnx("%s: interface name truncated",
1213 				    __func__);
1214 				free(h);
1215 				return (-1);
1216 			}
1217 		}
1218 		if (ipproto != -1)
1219 			h->ipproto = ipproto;
1220 
1221 		if (add_addr(new_srv, h))
1222 			return -1;
1223 		return (1);
1224 	}
1225 
1226 	return (host_dns(s, new_srv, max, port, ifname, ipproto));
1227 }
1228 
1229 int
1230 is_if_in_group(const char *ifname, const char *groupname)
1231 {
1232 	unsigned int len;
1233 	struct ifgroupreq ifgr;
1234 	struct ifg_req *ifg;
1235 	int s;
1236 	int ret = 0;
1237 
1238 	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
1239 		err(1, "socket");
1240 
1241 	memset(&ifgr, 0, sizeof(ifgr));
1242 	if (strlcpy(ifgr.ifgr_name, ifname, IFNAMSIZ) >= IFNAMSIZ)
1243 		err(1, "IFNAMSIZ");
1244 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1) {
1245 		if (errno == EINVAL || errno == ENOTTY)
1246 			goto end;
1247 		err(1, "SIOCGIFGROUP");
1248 	}
1249 
1250 	len = ifgr.ifgr_len;
1251 	ifgr.ifgr_groups = calloc(len / sizeof(struct ifg_req),
1252 	    sizeof(struct ifg_req));
1253 	if (ifgr.ifgr_groups == NULL)
1254 		err(1, "getifgroups");
1255 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1)
1256 		err(1, "SIOCGIFGROUP");
1257 
1258 	ifg = ifgr.ifgr_groups;
1259 	for (; ifg && len >= sizeof(struct ifg_req); ifg++) {
1260 		len -= sizeof(struct ifg_req);
1261 		if (strcmp(ifg->ifgrq_group, groupname) == 0) {
1262 			ret = 1;
1263 			break;
1264 		}
1265 	}
1266 	free(ifgr.ifgr_groups);
1267 
1268 end:
1269 	close(s);
1270 	return (ret);
1271 }
1272 
1273 int
1274 get_addrs(const char *addr, struct server *new_srv, in_port_t port)
1275 {
1276 	if (strcmp("", addr) == 0) {
1277 		if (host("127.0.0.1", new_srv, 1, port, "127.0.0.1",
1278 		    -1) <= 0) {
1279 			yyerror("invalid listen ip: %s",
1280 			    "127.0.0.1");
1281 			return (-1);
1282 		}
1283 		if (host("::1", new_srv, 1, port, "::1", -1) <= 0) {
1284 			yyerror("invalid listen ip: %s", "::1");
1285 			return (-1);
1286 		}
1287 	} else {
1288 		if (host(addr, new_srv, GOTWEBD_MAXIFACE, port, addr,
1289 		    -1) <= 0) {
1290 			yyerror("invalid listen ip: %s", addr);
1291 			return (-1);
1292 		}
1293 	}
1294 	return (0);
1295 }
1296 
1297 int
1298 addr_dup_check(struct addresslist *al, struct address *h, const char *new_srv,
1299     const char *other_srv)
1300 {
1301 	struct address *a;
1302 	void *ia;
1303 	char buf[INET6_ADDRSTRLEN];
1304 	const char *addrstr;
1305 
1306 	TAILQ_FOREACH(a, al, entry) {
1307 		if (memcmp(&a->ss, &h->ss, sizeof(h->ss)) != 0 ||
1308 		    a->port != h->port)
1309 			continue;
1310 
1311 		switch (h->ss.ss_family) {
1312 		case AF_INET:
1313 			ia = &((struct sockaddr_in *)(&h->ss))->sin_addr;
1314 			break;
1315 		case AF_INET6:
1316 			ia = &((struct sockaddr_in6 *)(&h->ss))->sin6_addr;
1317 			break;
1318 		default:
1319 			yyerror("unknown address family: %d", h->ss.ss_family);
1320 			return -1;
1321 		}
1322 		addrstr = inet_ntop(h->ss.ss_family, ia, buf, sizeof(buf));
1323 		if (addrstr) {
1324 			if (other_srv) {
1325 				yyerror("server %s: duplicate fcgi listen "
1326 				    "address %s:%d, already used by server %s",
1327 				    new_srv, addrstr, h->port, other_srv);
1328 			} else {
1329 				log_warnx("server: %s: duplicate fcgi listen "
1330 				    "address %s:%d", new_srv, addrstr, h->port);
1331 			}
1332 		} else {
1333 			if (other_srv) {
1334 				yyerror("server: %s: duplicate fcgi listen "
1335 				    "address, already used by server %s",
1336 				    new_srv, other_srv);
1337 			} else {
1338 				log_warnx("server %s: duplicate fcgi listen "
1339 				    "address", new_srv);
1340 			}
1341 		}
1342 
1343 		return -1;
1344 	}
1345 
1346 	return 0;
1347 }
1348 
1349 int
1350 add_addr(struct server *new_srv, struct address *h)
1351 {
1352 	struct server *srv;
1353 
1354 	/* Address cannot be shared between different servers. */
1355 	TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
1356 		if (srv == new_srv)
1357 			continue;
1358 		if (addr_dup_check(&srv->al, h, new_srv->name, srv->name))
1359 			return -1;
1360 	}
1361 
1362 	/* Tolerate duplicate address lines within the scope of a server. */
1363 	if (addr_dup_check(&new_srv->al, h, NULL, NULL) == 0)
1364 		TAILQ_INSERT_TAIL(&new_srv->al, h, entry);
1365 	else
1366 		free(h);
1367 
1368 	return 0;
1369 }