1 /*
2  * Copyright (c) 2016-2019, 2020-2021 Tracey Emery <tracey@traceyemery.net>
3  * Copyright (c) 2004, 2005 Esben Norby <norby@openbsd.org>
4  * Copyright (c) 2004 Ryan McBride <mcbride@openbsd.org>
5  * Copyright (c) 2002, 2003, 2004 Henning Brauer <henning@openbsd.org>
6  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
7  * Copyright (c) 2001 Daniel Hartmeier.  All rights reserved.
8  * Copyright (c) 2001 Theo de Raadt.  All rights reserved.
9  *
10  * Permission to use, copy, modify, and distribute this software for any
11  * purpose with or without fee is hereby granted, provided that the above
12  * copyright notice and this permission notice appear in all copies.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
15  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
16  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
17  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
18  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
19  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
20  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21  */
22 
23 %{
24 #include <sys/ioctl.h>
25 #include <sys/types.h>
26 #include <sys/queue.h>
27 #include <sys/socket.h>
28 #include <sys/stat.h>
29 
30 #include <net/if.h>
31 #include <netinet/in.h>
32 
33 #include <arpa/inet.h>
34 
35 #include <ctype.h>
36 #include <err.h>
37 #include <errno.h>
38 #include <event.h>
39 #include <ifaddrs.h>
40 #include <limits.h>
41 #include <netdb.h>
42 #include <stdarg.h>
43 #include <stdlib.h>
44 #include <stdio.h>
45 #include <string.h>
46 #include <syslog.h>
47 #include <unistd.h>
48 
49 #include "proc.h"
50 #include "gotwebd.h"
51 #include "got_sockaddr.h"
52 
53 TAILQ_HEAD(files, file)		 files = TAILQ_HEAD_INITIALIZER(files);
54 static struct file {
55 	TAILQ_ENTRY(file)	 entry;
56 	FILE			*stream;
57 	char			*name;
58 	int			 lineno;
59 	int			 errors;
60 } *file;
61 struct file	*newfile(const char *, int);
62 static void	 closefile(struct file *);
63 int		 check_file_secrecy(int, const char *);
64 int		 yyparse(void);
65 int		 yylex(void);
66 int		 yyerror(const char *, ...)
67     __attribute__((__format__ (printf, 1, 2)))
68     __attribute__((__nonnull__ (1)));
69 int		 kw_cmp(const void *, const void *);
70 int		 lookup(char *);
71 int		 lgetc(int);
72 int		 lungetc(int);
73 int		 findeol(void);
74 
75 TAILQ_HEAD(symhead, sym)	 symhead = TAILQ_HEAD_INITIALIZER(symhead);
76 struct sym {
77 	TAILQ_ENTRY(sym)	 entry;
78 	int			 used;
79 	int			 persist;
80 	char			*nam;
81 	char			*val;
82 };
83 
84 int	 symset(const char *, const char *, int);
85 char	*symget(const char *);
86 
87 static int		 errors;
88 
89 static struct gotwebd		*gotwebd;
90 static struct server		*new_srv;
91 static struct server		*conf_new_server(const char *);
92 int				 getservice(const char *);
93 int				 n;
94 
95 int		 get_addrs(const char *, struct server *, in_port_t);
96 int		 addr_dup_check(struct addresslist *, struct address *,
97 		    const char *, const char *);
98 int		 add_addr(struct server *, struct address *);
99 struct address	*host_v4(const char *);
100 struct address	*host_v6(const char *);
101 int		 host_dns(const char *, struct server *,
102 		    int, in_port_t, const char *, int);
103 int		 host_if(const char *, struct server *,
104 		    int, in_port_t, const char *, int);
105 int		 host(const char *, struct server *,
106 		    int, in_port_t, const char *, int);
107 int		 is_if_in_group(const char *, const char *);
108 
109 typedef struct {
110 	union {
111 		long long	 number;
112 		char		*string;
113 		in_port_t	 port;
114 	} v;
115 	int lineno;
116 } YYSTYPE;
117 
118 %}
119 
120 %token	LISTEN WWW_PATH MAX_REPOS SITE_NAME SITE_OWNER SITE_LINK LOGO
121 %token	LOGO_URL SHOW_REPO_OWNER SHOW_REPO_AGE SHOW_REPO_DESCRIPTION
122 %token	MAX_REPOS_DISPLAY REPOS_PATH MAX_COMMITS_DISPLAY ON ERROR
123 %token	SHOW_SITE_OWNER SHOW_REPO_CLONEURL PORT PREFORK RESPECT_EXPORTOK
124 %token	UNIX_SOCKET UNIX_SOCKET_NAME SERVER CHROOT CUSTOM_CSS
125 
126 %token	<v.string>	STRING
127 %type	<v.port>	fcgiport
128 %token	<v.number>	NUMBER
129 %type	<v.number>	boolean
130 
131 %%
132 
133 grammar		: /* empty */
134 		| grammar '\n'
135 		| grammar varset '\n'
136 		| grammar main '\n'
137 		| grammar server '\n'
138 		| grammar error '\n'		{ file->errors++; }
139 		;
140 
141 varset		: STRING '=' STRING	{
142 			char *s = $1;
143 			while (*s++) {
144 				if (isspace((unsigned char)*s)) {
145 					yyerror("macro name cannot contain "
146 					    "whitespace");
147 					free($1);
148 					free($3);
149 					YYERROR;
150 				}
151 			}
152 			if (symset($1, $3, 0) == -1)
153 				fatal("cannot store variable");
154 			free($1);
155 			free($3);
156 		}
157 		;
158 
159 boolean		: STRING {
160 			if (strcasecmp($1, "1") == 0 ||
161 			    strcasecmp($1, "yes") == 0 ||
162 			    strcasecmp($1, "on") == 0)
163 				$$ = 1;
164 			else if (strcasecmp($1, "0") == 0 ||
165 			    strcasecmp($1, "off") == 0 ||
166 			    strcasecmp($1, "no") == 0)
167 				$$ = 0;
168 			else {
169 				yyerror("invalid boolean value '%s'", $1);
170 				free($1);
171 				YYERROR;
172 			}
173 			free($1);
174 		}
175 		| ON { $$ = 1; }
176 		| NUMBER { $$ = $1; }
177 		;
178 
179 fcgiport	: PORT NUMBER {
180 			if ($2 <= 0 || $2 > (int)USHRT_MAX) {
181 				yyerror("invalid port: %lld", $2);
182 				YYERROR;
183 			}
184 			$$ = $2;
185 		}
186 		| PORT STRING {
187 			int	 val;
188 
189 			if ((val = getservice($2)) == -1) {
190 				yyerror("invalid port: %s", $2);
191 				free($2);
192 				YYERROR;
193 			}
194 			free($2);
195 
196 			$$ = val;
197 		}
198 		;
199 
200 main		: PREFORK NUMBER {
201 			gotwebd->prefork_gotwebd = $2;
202 		}
203 		| CHROOT STRING {
204 			n = strlcpy(gotwebd->httpd_chroot, $2,
205 			    sizeof(gotwebd->httpd_chroot));
206 			if (n >= sizeof(gotwebd->httpd_chroot)) {
207 				yyerror("%s: httpd_chroot truncated", __func__);
208 				free($2);
209 				YYERROR;
210 			}
211 			free($2);
212 		}
213 		| UNIX_SOCKET boolean {
214 			gotwebd->unix_socket = $2;
215 		}
216 		| UNIX_SOCKET_NAME STRING {
217 			n = snprintf(gotwebd->unix_socket_name,
218 			    sizeof(gotwebd->unix_socket_name), "%s%s",
219 			    strlen(gotwebd->httpd_chroot) ?
220 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $2);
221 			if (n < 0 ||
222 			    (size_t)n >= sizeof(gotwebd->unix_socket_name)) {
223 				yyerror("%s: unix_socket_name truncated",
224 				    __func__);
225 				free($2);
226 				YYERROR;
227 			}
228 			free($2);
229 		}
230 		;
231 
232 server		: SERVER STRING {
233 			struct server *srv;
234 
235 			TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
236 				if (strcmp(srv->name, $2) == 0) {
237 					yyerror("server name exists '%s'", $2);
238 					free($2);
239 					YYERROR;
240 				}
241 			}
242 
243 			new_srv = conf_new_server($2);
244 			log_debug("adding server %s", $2);
245 			free($2);
246 		}
247 		| SERVER STRING {
248 			struct server *srv;
249 
250 			TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
251 				if (strcmp(srv->name, $2) == 0) {
252 					yyerror("server name exists '%s'", $2);
253 					free($2);
254 					YYERROR;
255 				}
256 			}
257 
258 			new_srv = conf_new_server($2);
259 			log_debug("adding server %s", $2);
260 			free($2);
261 		} '{' optnl serveropts2 '}' {
262 		}
263 		;
264 
265 serveropts1	: REPOS_PATH STRING {
266 			n = strlcpy(new_srv->repos_path, $2,
267 			    sizeof(new_srv->repos_path));
268 			if (n >= sizeof(new_srv->repos_path)) {
269 				yyerror("%s: repos_path truncated", __func__);
270 				free($2);
271 				YYERROR;
272 			}
273 			free($2);
274 		}
275 		| SITE_NAME STRING {
276 			n = strlcpy(new_srv->site_name, $2,
277 			    sizeof(new_srv->site_name));
278 			if (n >= sizeof(new_srv->site_name)) {
279 				yyerror("%s: site_name truncated", __func__);
280 				free($2);
281 				YYERROR;
282 			}
283 			free($2);
284 		}
285 		| SITE_OWNER STRING {
286 			n = strlcpy(new_srv->site_owner, $2,
287 			    sizeof(new_srv->site_owner));
288 			if (n >= sizeof(new_srv->site_owner)) {
289 				yyerror("%s: site_owner truncated", __func__);
290 				free($2);
291 				YYERROR;
292 			}
293 			free($2);
294 		}
295 		| SITE_LINK STRING {
296 			n = strlcpy(new_srv->site_link, $2,
297 			    sizeof(new_srv->site_link));
298 			if (n >= sizeof(new_srv->site_link)) {
299 				yyerror("%s: site_link truncated", __func__);
300 				free($2);
301 				YYERROR;
302 			}
303 			free($2);
304 		}
305 		| LOGO STRING {
306 			n = strlcpy(new_srv->logo, $2, sizeof(new_srv->logo));
307 			if (n >= sizeof(new_srv->logo)) {
308 				yyerror("%s: logo truncated", __func__);
309 				free($2);
310 				YYERROR;
311 			}
312 			free($2);
313 		}
314 		| LOGO_URL STRING {
315 			n = strlcpy(new_srv->logo_url, $2,
316 			    sizeof(new_srv->logo_url));
317 			if (n >= sizeof(new_srv->logo_url)) {
318 				yyerror("%s: logo_url truncated", __func__);
319 				free($2);
320 				YYERROR;
321 			}
322 			free($2);
323 		}
324 		| CUSTOM_CSS STRING {
325 			n = strlcpy(new_srv->custom_css, $2,
326 			    sizeof(new_srv->custom_css));
327 			if (n >= sizeof(new_srv->custom_css)) {
328 				yyerror("%s: custom_css truncated", __func__);
329 				free($2);
330 				YYERROR;
331 			}
332 			free($2);
333 		}
334 		| LISTEN ON STRING fcgiport {
335 			if (get_addrs($3, new_srv, $4) == -1) {
336 				yyerror("could not get addrs");
337 				YYERROR;
338 			}
339 			new_srv->fcgi_socket = 1;
340 		}
341 		| MAX_REPOS NUMBER {
342 			if ($2 > 0)
343 				new_srv->max_repos = $2;
344 		}
345 		| SHOW_SITE_OWNER boolean {
346 			new_srv->show_site_owner = $2;
347 		}
348 		| SHOW_REPO_OWNER boolean {
349 			new_srv->show_repo_owner = $2;
350 		}
351 		| SHOW_REPO_AGE boolean {
352 			new_srv->show_repo_age = $2;
353 		}
354 		| SHOW_REPO_DESCRIPTION boolean {
355 			new_srv->show_repo_description = $2;
356 		}
357 		| SHOW_REPO_CLONEURL boolean {
358 			new_srv->show_repo_cloneurl = $2;
359 		}
360 		| RESPECT_EXPORTOK boolean {
361 			new_srv->respect_exportok = $2;
362 		}
363 		| MAX_REPOS_DISPLAY NUMBER {
364 				new_srv->max_repos_display = $2;
365 		}
366 		| MAX_COMMITS_DISPLAY NUMBER {
367 			if ($2 > 0)
368 				new_srv->max_commits_display = $2;
369 		}
370 		| UNIX_SOCKET boolean {
371 			new_srv->unix_socket = $2;
372 		}
373 		| UNIX_SOCKET_NAME STRING {
374 			n = snprintf(new_srv->unix_socket_name,
375 			    sizeof(new_srv->unix_socket_name), "%s%s",
376 			    strlen(gotwebd->httpd_chroot) ?
377 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $2);
378 			if (n < 0 ||
379 			    (size_t)n >= sizeof(new_srv->unix_socket_name)) {
380 				yyerror("%s: unix_socket_name truncated",
381 				    __func__);
382 				free($2);
383 				YYERROR;
384 			}
385 			free($2);
386 		}
387 		;
388 
389 serveropts2	: serveropts2 serveropts1 nl
390 		| serveropts1 optnl
391 		;
392 
393 nl		: '\n' optnl
394 		;
395 
396 optnl		: '\n' optnl		/* zero or more newlines */
397 		| /* empty */
398 		;
399 
400 %%
401 
402 struct keywords {
403 	const char	*k_name;
404 	int		 k_val;
405 };
406 
407 int
408 yyerror(const char *fmt, ...)
409 {
410 	va_list ap;
411 	char *msg;
412 
413 	file->errors++;
414 	va_start(ap, fmt);
415 	if (vasprintf(&msg, fmt, ap) == -1)
416 		fatalx("yyerror vasprintf");
417 	va_end(ap);
418 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
419 	free(msg);
420 	return (0);
421 }
422 
423 int
424 kw_cmp(const void *k, const void *e)
425 {
426 	return (strcmp(k, ((const struct keywords *)e)->k_name));
427 }
428 
429 int
430 lookup(char *s)
431 {
432 	/* This has to be sorted always. */
433 	static const struct keywords keywords[] = {
434 		{ "chroot",			CHROOT },
435 		{ "custom_css",			CUSTOM_CSS },
436 		{ "listen",			LISTEN },
437 		{ "logo",			LOGO },
438 		{ "logo_url"	,		LOGO_URL },
439 		{ "max_commits_display",	MAX_COMMITS_DISPLAY },
440 		{ "max_repos",			MAX_REPOS },
441 		{ "max_repos_display",		MAX_REPOS_DISPLAY },
442 		{ "on",				ON },
443 		{ "port",			PORT },
444 		{ "prefork",			PREFORK },
445 		{ "repos_path",			REPOS_PATH },
446 		{ "respect_exportok",		RESPECT_EXPORTOK },
447 		{ "server",			SERVER },
448 		{ "show_repo_age",		SHOW_REPO_AGE },
449 		{ "show_repo_cloneurl",		SHOW_REPO_CLONEURL },
450 		{ "show_repo_description",	SHOW_REPO_DESCRIPTION },
451 		{ "show_repo_owner",		SHOW_REPO_OWNER },
452 		{ "show_site_owner",		SHOW_SITE_OWNER },
453 		{ "site_link",			SITE_LINK },
454 		{ "site_name",			SITE_NAME },
455 		{ "site_owner",			SITE_OWNER },
456 		{ "unix_socket",		UNIX_SOCKET },
457 		{ "unix_socket_name",		UNIX_SOCKET_NAME },
458 	};
459 	const struct keywords *p;
460 
461 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
462 	    sizeof(keywords[0]), kw_cmp);
463 
464 	if (p)
465 		return (p->k_val);
466 	else
467 		return (STRING);
468 }
469 
470 #define MAXPUSHBACK	128
471 
472 unsigned char *parsebuf;
473 int parseindex;
474 unsigned char pushback_buffer[MAXPUSHBACK];
475 int pushback_index = 0;
476 
477 int
478 lgetc(int quotec)
479 {
480 	int c, next;
481 
482 	if (parsebuf) {
483 		/* Read character from the parsebuffer instead of input. */
484 		if (parseindex >= 0) {
485 			c = parsebuf[parseindex++];
486 			if (c != '\0')
487 				return (c);
488 			parsebuf = NULL;
489 		} else
490 			parseindex++;
491 	}
492 
493 	if (pushback_index)
494 		return (pushback_buffer[--pushback_index]);
495 
496 	if (quotec) {
497 		c = getc(file->stream);
498 		if (c == EOF)
499 			yyerror("reached end of file while parsing "
500 			    "quoted string");
501 		return (c);
502 	}
503 
504 	c = getc(file->stream);
505 	while (c == '\\') {
506 		next = getc(file->stream);
507 		if (next != '\n') {
508 			c = next;
509 			break;
510 		}
511 		yylval.lineno = file->lineno;
512 		file->lineno++;
513 		c = getc(file->stream);
514 	}
515 
516 	return (c);
517 }
518 
519 int
520 lungetc(int c)
521 {
522 	if (c == EOF)
523 		return (EOF);
524 	if (parsebuf) {
525 		parseindex--;
526 		if (parseindex >= 0)
527 			return (c);
528 	}
529 	if (pushback_index < MAXPUSHBACK-1)
530 		return (pushback_buffer[pushback_index++] = c);
531 	else
532 		return (EOF);
533 }
534 
535 int
536 findeol(void)
537 {
538 	int c;
539 
540 	parsebuf = NULL;
541 
542 	/* Skip to either EOF or the first real EOL. */
543 	while (1) {
544 		if (pushback_index)
545 			c = pushback_buffer[--pushback_index];
546 		else
547 			c = lgetc(0);
548 		if (c == '\n') {
549 			file->lineno++;
550 			break;
551 		}
552 		if (c == EOF)
553 			break;
554 	}
555 	return (ERROR);
556 }
557 
558 int
559 yylex(void)
560 {
561 	unsigned char buf[8096];
562 	unsigned char *p, *val;
563 	int quotec, next, c;
564 	int token;
565 
566 top:
567 	p = buf;
568 	c = lgetc(0);
569 	while (c == ' ' || c == '\t')
570 		c = lgetc(0); /* nothing */
571 
572 	yylval.lineno = file->lineno;
573 	if (c == '#') {
574 		c = lgetc(0);
575 		while (c != '\n' && c != EOF)
576 			c = lgetc(0); /* nothing */
577 	}
578 	if (c == '$' && parsebuf == NULL) {
579 		while (1) {
580 			c = lgetc(0);
581 			if (c == EOF)
582 				return (0);
583 
584 			if (p + 1 >= buf + sizeof(buf) - 1) {
585 				yyerror("string too long");
586 				return (findeol());
587 			}
588 			if (isalnum(c) || c == '_') {
589 				*p++ = c;
590 				continue;
591 			}
592 			*p = '\0';
593 			lungetc(c);
594 			break;
595 		}
596 		val = symget(buf);
597 		if (val == NULL) {
598 			yyerror("macro '%s' not defined", buf);
599 			return (findeol());
600 		}
601 		parsebuf = val;
602 		parseindex = 0;
603 		goto top;
604 	}
605 
606 	switch (c) {
607 	case '\'':
608 	case '"':
609 		quotec = c;
610 		while (1) {
611 			c = lgetc(quotec);
612 			if (c == EOF)
613 				return (0);
614 			if (c == '\n') {
615 				file->lineno++;
616 				continue;
617 			} else if (c == '\\') {
618 				next = lgetc(quotec);
619 				if (next == EOF)
620 					return (0);
621 				if (next == quotec || c == ' ' || c == '\t')
622 					c = next;
623 				else if (next == '\n') {
624 					file->lineno++;
625 					continue;
626 				} else
627 					lungetc(next);
628 			} else if (c == quotec) {
629 				*p = '\0';
630 				break;
631 			} else if (c == '\0') {
632 				yyerror("syntax error");
633 				return (findeol());
634 			}
635 			if (p + 1 >= buf + sizeof(buf) - 1) {
636 				yyerror("string too long");
637 				return (findeol());
638 			}
639 			*p++ = c;
640 		}
641 		yylval.v.string = strdup(buf);
642 		if (yylval.v.string == NULL)
643 			err(1, "yylex: strdup");
644 		return (STRING);
645 	}
646 
647 #define allowed_to_end_number(x) \
648 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
649 
650 	if (c == '-' || isdigit(c)) {
651 		do {
652 			*p++ = c;
653 			if ((unsigned)(p-buf) >= sizeof(buf)) {
654 				yyerror("string too long");
655 				return (findeol());
656 			}
657 			c = lgetc(0);
658 		} while (c != EOF && isdigit(c));
659 		lungetc(c);
660 		if (p == buf + 1 && buf[0] == '-')
661 			goto nodigits;
662 		if (c == EOF || allowed_to_end_number(c)) {
663 			const char *errstr = NULL;
664 
665 			*p = '\0';
666 			yylval.v.number = strtonum(buf, LLONG_MIN,
667 			    LLONG_MAX, &errstr);
668 			if (errstr) {
669 				yyerror("\"%s\" invalid number: %s",
670 				    buf, errstr);
671 				return (findeol());
672 			}
673 			return (NUMBER);
674 		} else {
675 nodigits:
676 			while (p > buf + 1)
677 				lungetc(*--p);
678 			c = *--p;
679 			if (c == '-')
680 				return (c);
681 		}
682 	}
683 
684 #define allowed_in_string(x) \
685 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
686 	x != '{' && x != '}' && \
687 	x != '!' && x != '=' && x != '#' && \
688 	x != ','))
689 
690 	if (isalnum(c) || c == ':' || c == '_') {
691 		do {
692 			*p++ = c;
693 			if ((unsigned)(p-buf) >= sizeof(buf)) {
694 				yyerror("string too long");
695 				return (findeol());
696 			}
697 			c = lgetc(0);
698 		} while (c != EOF && (allowed_in_string(c)));
699 		lungetc(c);
700 		*p = '\0';
701 		token = lookup(buf);
702 		if (token == STRING) {
703 			yylval.v.string = strdup(buf);
704 			if (yylval.v.string == NULL)
705 				err(1, "yylex: strdup");
706 		}
707 		return (token);
708 	}
709 	if (c == '\n') {
710 		yylval.lineno = file->lineno;
711 		file->lineno++;
712 	}
713 	if (c == EOF)
714 		return (0);
715 	return (c);
716 }
717 
718 int
719 check_file_secrecy(int fd, const char *fname)
720 {
721 	struct stat st;
722 
723 	if (fstat(fd, &st)) {
724 		log_warn("cannot stat %s", fname);
725 		return (-1);
726 	}
727 	if (st.st_uid != 0 && st.st_uid != getuid()) {
728 		log_warnx("%s: owner not root or current user", fname);
729 		return (-1);
730 	}
731 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
732 		log_warnx("%s: group writable or world read/writable", fname);
733 		return (-1);
734 	}
735 	return (0);
736 }
737 
738 struct file *
739 newfile(const char *name, int secret)
740 {
741 	struct file *nfile;
742 
743 	nfile = calloc(1, sizeof(struct file));
744 	if (nfile == NULL) {
745 		log_warn("calloc");
746 		return (NULL);
747 	}
748 	nfile->name = strdup(name);
749 	if (nfile->name == NULL) {
750 		log_warn("strdup");
751 		free(nfile);
752 		return (NULL);
753 	}
754 	nfile->stream = fopen(nfile->name, "r");
755 	if (nfile->stream == NULL) {
756 		/* no warning, we don't require a conf file */
757 		free(nfile->name);
758 		free(nfile);
759 		return (NULL);
760 	} else if (secret &&
761 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
762 		fclose(nfile->stream);
763 		free(nfile->name);
764 		free(nfile);
765 		return (NULL);
766 	}
767 	nfile->lineno = 1;
768 	return (nfile);
769 }
770 
771 static void
772 closefile(struct file *xfile)
773 {
774 	fclose(xfile->stream);
775 	free(xfile->name);
776 	free(xfile);
777 }
778 
779 static void
780 add_default_server(void)
781 {
782 	new_srv = conf_new_server(D_SITENAME);
783 	log_debug("%s: adding default server %s", __func__, D_SITENAME);
784 }
785 
786 int
787 parse_config(const char *filename, struct gotwebd *env)
788 {
789 	struct sym *sym, *next;
790 
791 	if (config_init(env) == -1)
792 		fatalx("failed to initialize configuration");
793 
794 	gotwebd = env;
795 
796 	file = newfile(filename, 0);
797 	if (file == NULL) {
798 		add_default_server();
799 		sockets_parse_sockets(env);
800 		/* just return, as we don't require a conf file */
801 		return (0);
802 	}
803 
804 	yyparse();
805 	errors = file->errors;
806 	closefile(file);
807 
808 	/* Free macros and check which have not been used. */
809 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
810 		if ((gotwebd->gotwebd_verbose > 1) && !sym->used)
811 			fprintf(stderr, "warning: macro '%s' not used\n",
812 			    sym->nam);
813 		if (!sym->persist) {
814 			free(sym->nam);
815 			free(sym->val);
816 			TAILQ_REMOVE(&symhead, sym, entry);
817 			free(sym);
818 		}
819 	}
820 
821 	if (errors)
822 		return (-1);
823 
824 	/* just add default server if no config specified */
825 	if (gotwebd->server_cnt == 0)
826 		add_default_server();
827 
828 	/* setup our listening sockets */
829 	sockets_parse_sockets(env);
830 
831 	return (0);
832 }
833 
834 struct server *
835 conf_new_server(const char *name)
836 {
837 	struct server *srv = NULL;
838 
839 	srv = calloc(1, sizeof(*srv));
840 	if (srv == NULL)
841 		fatalx("%s: calloc", __func__);
842 
843 	n = strlcpy(srv->name, name, sizeof(srv->name));
844 	if (n >= sizeof(srv->name))
845 		fatalx("%s: strlcpy", __func__);
846 	n = snprintf(srv->unix_socket_name,
847 	    sizeof(srv->unix_socket_name), "%s%s", D_HTTPD_CHROOT,
848 	    D_UNIX_SOCKET);
849 	if (n < 0 || (size_t)n >= sizeof(srv->unix_socket_name))
850 		fatalx("%s: snprintf", __func__);
851 	n = strlcpy(srv->repos_path, D_GOTPATH,
852 	    sizeof(srv->repos_path));
853 	if (n >= sizeof(srv->repos_path))
854 		fatalx("%s: strlcpy", __func__);
855 	n = strlcpy(srv->site_name, D_SITENAME,
856 	    sizeof(srv->site_name));
857 	if (n >= sizeof(srv->site_name))
858 		fatalx("%s: strlcpy", __func__);
859 	n = strlcpy(srv->site_owner, D_SITEOWNER,
860 	    sizeof(srv->site_owner));
861 	if (n >= sizeof(srv->site_owner))
862 		fatalx("%s: strlcpy", __func__);
863 	n = strlcpy(srv->site_link, D_SITELINK,
864 	    sizeof(srv->site_link));
865 	if (n >= sizeof(srv->site_link))
866 		fatalx("%s: strlcpy", __func__);
867 	n = strlcpy(srv->logo, D_GOTLOGO,
868 	    sizeof(srv->logo));
869 	if (n >= sizeof(srv->logo))
870 		fatalx("%s: strlcpy", __func__);
871 	n = strlcpy(srv->logo_url, D_GOTURL, sizeof(srv->logo_url));
872 	if (n >= sizeof(srv->logo_url))
873 		fatalx("%s: strlcpy", __func__);
874 	n = strlcpy(srv->custom_css, D_GOTWEBCSS, sizeof(srv->custom_css));
875 	if (n >= sizeof(srv->custom_css))
876 		fatalx("%s: strlcpy", __func__);
877 
878 	srv->show_site_owner = D_SHOWSOWNER;
879 	srv->show_repo_owner = D_SHOWROWNER;
880 	srv->show_repo_age = D_SHOWAGE;
881 	srv->show_repo_description = D_SHOWDESC;
882 	srv->show_repo_cloneurl = D_SHOWURL;
883 	srv->respect_exportok = D_RESPECTEXPORTOK;
884 
885 	srv->max_repos_display = D_MAXREPODISP;
886 	srv->max_commits_display = D_MAXCOMMITDISP;
887 	srv->max_repos = D_MAXREPO;
888 
889 	srv->unix_socket = 1;
890 	srv->fcgi_socket = 0;
891 
892 	TAILQ_INIT(&srv->al);
893 	TAILQ_INSERT_TAIL(&gotwebd->servers, srv, entry);
894 	gotwebd->server_cnt++;
895 
896 	return srv;
897 };
898 
899 int
900 symset(const char *nam, const char *val, int persist)
901 {
902 	struct sym *sym;
903 
904 	TAILQ_FOREACH(sym, &symhead, entry) {
905 		if (strcmp(nam, sym->nam) == 0)
906 			break;
907 	}
908 
909 	if (sym != NULL) {
910 		if (sym->persist == 1)
911 			return (0);
912 		else {
913 			free(sym->nam);
914 			free(sym->val);
915 			TAILQ_REMOVE(&symhead, sym, entry);
916 			free(sym);
917 		}
918 	}
919 	sym = calloc(1, sizeof(*sym));
920 	if (sym == NULL)
921 		return (-1);
922 
923 	sym->nam = strdup(nam);
924 	if (sym->nam == NULL) {
925 		free(sym);
926 		return (-1);
927 	}
928 	sym->val = strdup(val);
929 	if (sym->val == NULL) {
930 		free(sym->nam);
931 		free(sym);
932 		return (-1);
933 	}
934 	sym->used = 0;
935 	sym->persist = persist;
936 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
937 	return (0);
938 }
939 
940 int
941 cmdline_symset(char *s)
942 {
943 	char *sym, *val;
944 	int ret;
945 
946 	val = strrchr(s, '=');
947 	if (val == NULL)
948 		return (-1);
949 
950 	sym = strndup(s, val - s);
951 	if (sym == NULL)
952 		fatal("%s: strndup", __func__);
953 
954 	ret = symset(sym, val + 1, 1);
955 	free(sym);
956 
957 	return (ret);
958 }
959 
960 char *
961 symget(const char *nam)
962 {
963 	struct sym *sym;
964 
965 	TAILQ_FOREACH(sym, &symhead, entry) {
966 		if (strcmp(nam, sym->nam) == 0) {
967 			sym->used = 1;
968 			return (sym->val);
969 		}
970 	}
971 	return (NULL);
972 }
973 
974 int
975 getservice(const char *n)
976 {
977 	struct servent *s;
978 	const char *errstr;
979 	long long llval;
980 
981 	llval = strtonum(n, 0, UINT16_MAX, &errstr);
982 	if (errstr) {
983 		s = getservbyname(n, "tcp");
984 		if (s == NULL)
985 			s = getservbyname(n, "udp");
986 		if (s == NULL)
987 			return (-1);
988 		return ntohs(s->s_port);
989 	}
990 
991 	return (unsigned short)llval;
992 }
993 
994 struct address *
995 host_v4(const char *s)
996 {
997 	struct in_addr ina;
998 	struct sockaddr_in *sain;
999 	struct address *h;
1000 
1001 	memset(&ina, 0, sizeof(ina));
1002 	if (inet_pton(AF_INET, s, &ina) != 1)
1003 		return (NULL);
1004 
1005 	if ((h = calloc(1, sizeof(*h))) == NULL)
1006 		fatal(__func__);
1007 	sain = (struct sockaddr_in *)&h->ss;
1008 	got_sockaddr_inet_init(sain, &ina);
1009 	if (sain->sin_addr.s_addr == INADDR_ANY)
1010 		h->prefixlen = 0; /* 0.0.0.0 address */
1011 	else
1012 		h->prefixlen = -1; /* host address */
1013 	return (h);
1014 }
1015 
1016 struct address *
1017 host_v6(const char *s)
1018 {
1019 	struct addrinfo hints, *res;
1020 	struct sockaddr_in6 *sa_in6, *ra;
1021 	struct address *h = NULL;
1022 
1023 	memset(&hints, 0, sizeof(hints));
1024 	hints.ai_family = AF_INET6;
1025 	hints.ai_socktype = SOCK_DGRAM; /* dummy */
1026 	hints.ai_flags = AI_NUMERICHOST;
1027 	if (getaddrinfo(s, "0", &hints, &res) == 0) {
1028 		if ((h = calloc(1, sizeof(*h))) == NULL)
1029 			fatal(__func__);
1030 		sa_in6 = (struct sockaddr_in6 *)&h->ss;
1031 		ra = (struct sockaddr_in6 *)res->ai_addr;
1032 		got_sockaddr_inet6_init(sa_in6, &ra->sin6_addr,
1033 		    ra->sin6_scope_id);
1034 		if (memcmp(&sa_in6->sin6_addr, &in6addr_any,
1035 		    sizeof(sa_in6->sin6_addr)) == 0)
1036 			h->prefixlen = 0; /* any address */
1037 		else
1038 			h->prefixlen = -1; /* host address */
1039 		freeaddrinfo(res);
1040 	}
1041 
1042 	return (h);
1043 }
1044 
1045 int
1046 host_dns(const char *s, struct server *new_srv, int max,
1047     in_port_t port, const char *ifname, int ipproto)
1048 {
1049 	struct addrinfo hints, *res0, *res;
1050 	int error, cnt = 0;
1051 	struct sockaddr_in *sain;
1052 	struct sockaddr_in6 *sin6;
1053 	struct address *h;
1054 
1055 	if ((cnt = host_if(s, new_srv, max, port, ifname, ipproto)) != 0)
1056 		return (cnt);
1057 
1058 	memset(&hints, 0, sizeof(hints));
1059 	hints.ai_family = PF_UNSPEC;
1060 	hints.ai_socktype = SOCK_DGRAM; /* DUMMY */
1061 	hints.ai_flags = AI_ADDRCONFIG;
1062 	error = getaddrinfo(s, NULL, &hints, &res0);
1063 	if (error == EAI_AGAIN || error == EAI_NODATA || error == EAI_NONAME)
1064 		return (0);
1065 	if (error) {
1066 		log_warnx("%s: could not parse \"%s\": %s", __func__, s,
1067 		    gai_strerror(error));
1068 		return (-1);
1069 	}
1070 
1071 	for (res = res0; res && cnt < max; res = res->ai_next) {
1072 		if (res->ai_family != AF_INET &&
1073 		    res->ai_family != AF_INET6)
1074 			continue;
1075 		if ((h = calloc(1, sizeof(*h))) == NULL)
1076 			fatal(__func__);
1077 
1078 		if (port)
1079 			h->port = port;
1080 		if (ifname != NULL) {
1081 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1082 			    sizeof(h->ifname)) {
1083 				log_warnx("%s: interface name truncated",
1084 				    __func__);
1085 				freeaddrinfo(res0);
1086 				free(h);
1087 				return (-1);
1088 			}
1089 		}
1090 		if (ipproto != -1)
1091 			h->ipproto = ipproto;
1092 		h->ss.ss_family = res->ai_family;
1093 		h->prefixlen = -1; /* host address */
1094 
1095 		if (res->ai_family == AF_INET) {
1096 			struct sockaddr_in *ra;
1097 			sain = (struct sockaddr_in *)&h->ss;
1098 			ra = (struct sockaddr_in *)res->ai_addr;
1099 			got_sockaddr_inet_init(sain, &ra->sin_addr);
1100 		} else {
1101 			struct sockaddr_in6 *ra;
1102 			sin6 = (struct sockaddr_in6 *)&h->ss;
1103 			ra = (struct sockaddr_in6 *)res->ai_addr;
1104 			got_sockaddr_inet6_init(sin6, &ra->sin6_addr, 0);
1105 		}
1106 
1107 		if (add_addr(new_srv, h))
1108 			return -1;
1109 		cnt++;
1110 	}
1111 	if (cnt == max && res) {
1112 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1113 		    s, max);
1114 	}
1115 	freeaddrinfo(res0);
1116 	return (cnt);
1117 }
1118 
1119 int
1120 host_if(const char *s, struct server *new_srv, int max,
1121     in_port_t port, const char *ifname, int ipproto)
1122 {
1123 	struct ifaddrs *ifap, *p;
1124 	struct sockaddr_in *sain;
1125 	struct sockaddr_in6 *sin6;
1126 	struct address *h;
1127 	int cnt = 0, af;
1128 
1129 	if (getifaddrs(&ifap) == -1)
1130 		fatal("getifaddrs");
1131 
1132 	/* First search for IPv4 addresses */
1133 	af = AF_INET;
1134 
1135  nextaf:
1136 	for (p = ifap; p != NULL && cnt < max; p = p->ifa_next) {
1137 		if (p->ifa_addr == NULL ||
1138 		    p->ifa_addr->sa_family != af ||
1139 		    (strcmp(s, p->ifa_name) != 0 &&
1140 		    !is_if_in_group(p->ifa_name, s)))
1141 			continue;
1142 		if ((h = calloc(1, sizeof(*h))) == NULL)
1143 			fatal("calloc");
1144 
1145 		if (port)
1146 			h->port = port;
1147 		if (ifname != NULL) {
1148 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1149 			    sizeof(h->ifname)) {
1150 				log_warnx("%s: interface name truncated",
1151 				    __func__);
1152 				free(h);
1153 				freeifaddrs(ifap);
1154 				return (-1);
1155 			}
1156 		}
1157 		if (ipproto != -1)
1158 			h->ipproto = ipproto;
1159 		h->ss.ss_family = af;
1160 		h->prefixlen = -1; /* host address */
1161 
1162 		if (af == AF_INET) {
1163 			struct sockaddr_in *ra;
1164 			sain = (struct sockaddr_in *)&h->ss;
1165 			ra = (struct sockaddr_in *)p->ifa_addr;
1166 			got_sockaddr_inet_init(sain, &ra->sin_addr);
1167 		} else {
1168 			struct sockaddr_in6 *ra;
1169 			sin6 = (struct sockaddr_in6 *)&h->ss;
1170 			ra = (struct sockaddr_in6 *)p->ifa_addr;
1171 			got_sockaddr_inet6_init(sin6, &ra->sin6_addr,
1172 			    ra->sin6_scope_id);
1173 		}
1174 
1175 		if (add_addr(new_srv, h))
1176 			return -1;
1177 		cnt++;
1178 	}
1179 	if (af == AF_INET) {
1180 		/* Next search for IPv6 addresses */
1181 		af = AF_INET6;
1182 		goto nextaf;
1183 	}
1184 
1185 	if (cnt > max) {
1186 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1187 		    s, max);
1188 	}
1189 	freeifaddrs(ifap);
1190 	return (cnt);
1191 }
1192 
1193 int
1194 host(const char *s, struct server *new_srv, int max,
1195     in_port_t port, const char *ifname, int ipproto)
1196 {
1197 	struct address *h;
1198 
1199 	h = host_v4(s);
1200 
1201 	/* IPv6 address? */
1202 	if (h == NULL)
1203 		h = host_v6(s);
1204 
1205 	if (h != NULL) {
1206 		if (port)
1207 			h->port = port;
1208 		if (ifname != NULL) {
1209 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1210 			    sizeof(h->ifname)) {
1211 				log_warnx("%s: interface name truncated",
1212 				    __func__);
1213 				free(h);
1214 				return (-1);
1215 			}
1216 		}
1217 		if (ipproto != -1)
1218 			h->ipproto = ipproto;
1219 
1220 		if (add_addr(new_srv, h))
1221 			return -1;
1222 		return (1);
1223 	}
1224 
1225 	return (host_dns(s, new_srv, max, port, ifname, ipproto));
1226 }
1227 
1228 int
1229 is_if_in_group(const char *ifname, const char *groupname)
1230 {
1231 /* TA: Check this... */
1232 #ifdef HAVE_STRUCT_IFGROUPREQ
1233 	unsigned int len;
1234 	struct ifgroupreq ifgr;
1235 	struct ifg_req *ifg;
1236 	int s;
1237 	int ret = 0;
1238 
1239 	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
1240 		err(1, "socket");
1241 
1242 	memset(&ifgr, 0, sizeof(ifgr));
1243 	if (strlcpy(ifgr.ifgr_name, ifname, IFNAMSIZ) >= IFNAMSIZ)
1244 		err(1, "IFNAMSIZ");
1245 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1) {
1246 		if (errno == EINVAL || errno == ENOTTY)
1247 			goto end;
1248 		err(1, "SIOCGIFGROUP");
1249 	}
1250 
1251 	len = ifgr.ifgr_len;
1252 	ifgr.ifgr_groups = calloc(len / sizeof(struct ifg_req),
1253 	    sizeof(struct ifg_req));
1254 	if (ifgr.ifgr_groups == NULL)
1255 		err(1, "getifgroups");
1256 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1)
1257 		err(1, "SIOCGIFGROUP");
1258 
1259 	ifg = ifgr.ifgr_groups;
1260 	for (; ifg && len >= sizeof(struct ifg_req); ifg++) {
1261 		len -= sizeof(struct ifg_req);
1262 		if (strcmp(ifg->ifgrq_group, groupname) == 0) {
1263 			ret = 1;
1264 			break;
1265 		}
1266 	}
1267 	free(ifgr.ifgr_groups);
1268 
1269 end:
1270 	close(s);
1271 	return (ret);
1272 #else
1273 	return (0);
1274 #endif
1275 }
1276 
1277 int
1278 get_addrs(const char *addr, struct server *new_srv, in_port_t port)
1279 {
1280 	if (strcmp("", addr) == 0) {
1281 		if (host("127.0.0.1", new_srv, 1, port, "127.0.0.1",
1282 		    -1) <= 0) {
1283 			yyerror("invalid listen ip: %s",
1284 			    "127.0.0.1");
1285 			return (-1);
1286 		}
1287 		if (host("::1", new_srv, 1, port, "::1", -1) <= 0) {
1288 			yyerror("invalid listen ip: %s", "::1");
1289 			return (-1);
1290 		}
1291 	} else {
1292 		if (host(addr, new_srv, GOTWEBD_MAXIFACE, port, addr,
1293 		    -1) <= 0) {
1294 			yyerror("invalid listen ip: %s", addr);
1295 			return (-1);
1296 		}
1297 	}
1298 	return (0);
1299 }
1300 
1301 int
1302 addr_dup_check(struct addresslist *al, struct address *h, const char *new_srv,
1303     const char *other_srv)
1304 {
1305 	struct address *a;
1306 	void *ia;
1307 	char buf[INET6_ADDRSTRLEN];
1308 	const char *addrstr;
1309 
1310 	TAILQ_FOREACH(a, al, entry) {
1311 		if (memcmp(&a->ss, &h->ss, sizeof(h->ss)) != 0 ||
1312 		    a->port != h->port)
1313 			continue;
1314 
1315 		switch (h->ss.ss_family) {
1316 		case AF_INET:
1317 			ia = &((struct sockaddr_in *)(&h->ss))->sin_addr;
1318 			break;
1319 		case AF_INET6:
1320 			ia = &((struct sockaddr_in6 *)(&h->ss))->sin6_addr;
1321 			break;
1322 		default:
1323 			yyerror("unknown address family: %d", h->ss.ss_family);
1324 			return -1;
1325 		}
1326 		addrstr = inet_ntop(h->ss.ss_family, ia, buf, sizeof(buf));
1327 		if (addrstr) {
1328 			if (other_srv) {
1329 				yyerror("server %s: duplicate fcgi listen "
1330 				    "address %s:%d, already used by server %s",
1331 				    new_srv, addrstr, h->port, other_srv);
1332 			} else {
1333 				log_warnx("server: %s: duplicate fcgi listen "
1334 				    "address %s:%d", new_srv, addrstr, h->port);
1335 			}
1336 		} else {
1337 			if (other_srv) {
1338 				yyerror("server: %s: duplicate fcgi listen "
1339 				    "address, already used by server %s",
1340 				    new_srv, other_srv);
1341 			} else {
1342 				log_warnx("server %s: duplicate fcgi listen "
1343 				    "address", new_srv);
1344 			}
1345 		}
1346 
1347 		return -1;
1348 	}
1349 
1350 	return 0;
1351 }
1352 
1353 int
1354 add_addr(struct server *new_srv, struct address *h)
1355 {
1356 	struct server *srv;
1357 
1358 	/* Address cannot be shared between different servers. */
1359 	TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
1360 		if (srv == new_srv)
1361 			continue;
1362 		if (addr_dup_check(&srv->al, h, new_srv->name, srv->name))
1363 			return -1;
1364 	}
1365 
1366 	/* Tolerate duplicate address lines within the scope of a server. */
1367 	if (addr_dup_check(&new_srv->al, h, NULL, NULL) == 0)
1368 		TAILQ_INSERT_TAIL(&new_srv->al, h, entry);
1369 	else
1370 		free(h);
1371 
1372 	return 0;
1373 }