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 addresslist *, in_port_t);
96 struct address	*host_v4(const char *);
97 struct address	*host_v6(const char *);
98 int		 host_dns(const char *, struct addresslist *,
99 		    int, in_port_t, const char *, int);
100 int		 host_if(const char *, struct addresslist *,
101 		    int, in_port_t, const char *, int);
102 int		 host(const char *, struct addresslist *,
103 		    int, in_port_t, const char *, int);
104 int		 is_if_in_group(const char *, const char *);
105 
106 typedef struct {
107 	union {
108 		long long	 number;
109 		char		*string;
110 		in_port_t	 port;
111 	} v;
112 	int lineno;
113 } YYSTYPE;
114 
115 %}
116 
117 %token	BIND INTERFACE WWW_PATH MAX_REPOS SITE_NAME SITE_OWNER SITE_LINK LOGO
118 %token	LOGO_URL SHOW_REPO_OWNER SHOW_REPO_AGE SHOW_REPO_DESCRIPTION
119 %token	MAX_REPOS_DISPLAY REPOS_PATH MAX_COMMITS_DISPLAY ON ERROR
120 %token	SHOW_SITE_OWNER SHOW_REPO_CLONEURL PORT PREFORK FCGI_SOCKET
121 %token	UNIX_SOCKET UNIX_SOCKET_NAME SERVER CHROOT CUSTOM_CSS
122 
123 %token	<v.string>	STRING
124 %type	<v.port>	fcgiport
125 %token	<v.number>	NUMBER
126 %type	<v.number>	boolean
127 
128 %%
129 
130 grammar		:
131 		| grammar '\n'
132 		| grammar main '\n'
133 		| grammar server '\n'
134 		;
135 
136 boolean		: STRING {
137 			if (strcasecmp($1, "1") == 0 ||
138 			    strcasecmp($1, "yes") == 0 ||
139 			    strcasecmp($1, "on") == 0)
140 				$$ = 1;
141 			else if (strcasecmp($1, "0") == 0 ||
142 			    strcasecmp($1, "off") == 0 ||
143 			    strcasecmp($1, "no") == 0)
144 				$$ = 0;
145 			else {
146 				yyerror("invalid boolean value '%s'", $1);
147 				free($1);
148 				YYERROR;
149 			}
150 			free($1);
151 		}
152 		| ON { $$ = 1; }
153 		| NUMBER { $$ = $1; }
154 		;
155 
156 fcgiport	: NUMBER {
157 			if ($1 <= 0 || $1 > (int)USHRT_MAX) {
158 				yyerror("invalid port: %lld", $1);
159 				YYERROR;
160 			}
161 			$$ = htons($1);
162 		}
163 		| STRING {
164 			int	 val;
165 
166 			if ((val = getservice($1)) == -1) {
167 				yyerror("invalid port: %s", $1);
168 				free($1);
169 				YYERROR;
170 			}
171 			free($1);
172 
173 			$$ = val;
174 		}
175 		;
176 
177 main		: PREFORK NUMBER {
178 			gotwebd->prefork_gotwebd = $2;
179 		}
180 		| CHROOT STRING {
181 			n = strlcpy(gotwebd->httpd_chroot, $2,
182 			    sizeof(gotwebd->httpd_chroot));
183 			if (n >= sizeof(gotwebd->httpd_chroot)) {
184 				yyerror("%s: httpd_chroot truncated", __func__);
185 				free($2);
186 				YYERROR;
187 			}
188 			free($2);
189 		}
190 		| FCGI_SOCKET boolean {
191 			gotwebd->fcgi_socket = $2;
192 		}
193 		| FCGI_SOCKET boolean  {
194 			gotwebd->fcgi_socket = $2;
195 		} '{' optnl socketopts4 '}'
196 		| UNIX_SOCKET boolean {
197 			gotwebd->unix_socket = $2;
198 		}
199 		| UNIX_SOCKET_NAME STRING {
200 			n = snprintf(gotwebd->unix_socket_name,
201 			    sizeof(gotwebd->unix_socket_name), "%s%s",
202 			    strlen(gotwebd->httpd_chroot) ?
203 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $2);
204 			if (n < 0) {
205 				yyerror("%s: unix_socket_name truncated",
206 				    __func__);
207 				free($2);
208 				YYERROR;
209 			}
210 			free($2);
211 		}
212 		;
213 
214 server		: SERVER STRING {
215 			struct server *srv;
216 
217 			TAILQ_FOREACH(srv, gotwebd->servers, entry) {
218 				if (strcmp(srv->name, $2) == 0) {
219 					yyerror("server name exists '%s'", $2);
220 					free($2);
221 					YYERROR;
222 				}
223 			}
224 
225 			new_srv = conf_new_server($2);
226 			if (new_srv->fcgi_socket)
227 				if (get_addrs(new_srv->fcgi_socket_bind,
228 				    new_srv->al,
229 				    new_srv->fcgi_socket_port) == -1) {
230 					yyerror("could not get tcp iface "
231 					    "addrs");
232 					YYERROR;
233 				}
234 			log_debug("adding server %s", $2);
235 			free($2);
236 		}
237 		| SERVER STRING {
238 			struct server *srv;
239 
240 			TAILQ_FOREACH(srv, gotwebd->servers, entry) {
241 				if (strcmp(srv->name, $2) == 0) {
242 					yyerror("server name exists '%s'", $2);
243 					free($2);
244 					YYERROR;
245 				}
246 			}
247 
248 			new_srv = conf_new_server($2);
249 			log_debug("adding server %s", $2);
250 			free($2);
251 		} '{' optnl serveropts2 '}' {
252 			if (get_addrs(new_srv->fcgi_socket_bind,
253 			    new_srv->al, new_srv->fcgi_socket_port) == -1) {
254 				yyerror("could not get tcp iface addrs");
255 				YYERROR;
256 			}
257 		}
258 		;
259 
260 serveropts1	: REPOS_PATH STRING {
261 			n = strlcpy(new_srv->repos_path, $2,
262 			    sizeof(new_srv->repos_path));
263 			if (n >= sizeof(new_srv->repos_path)) {
264 				yyerror("%s: repos_path truncated", __func__);
265 				free($2);
266 				YYERROR;
267 			}
268 			free($2);
269 		}
270 		| SITE_NAME STRING {
271 			n = strlcpy(new_srv->site_name, $2,
272 			    sizeof(new_srv->site_name));
273 			if (n >= sizeof(new_srv->site_name)) {
274 				yyerror("%s: site_name truncated", __func__);
275 				free($2);
276 				YYERROR;
277 			}
278 			free($2);
279 		}
280 		| SITE_OWNER STRING {
281 			n = strlcpy(new_srv->site_owner, $2,
282 			    sizeof(new_srv->site_owner));
283 			if (n >= sizeof(new_srv->site_owner)) {
284 				yyerror("%s: site_owner truncated", __func__);
285 				free($2);
286 				YYERROR;
287 			}
288 			free($2);
289 		}
290 		| SITE_LINK STRING {
291 			n = strlcpy(new_srv->site_link, $2,
292 			    sizeof(new_srv->site_link));
293 			if (n >= sizeof(new_srv->site_link)) {
294 				yyerror("%s: site_link truncated", __func__);
295 				free($2);
296 				YYERROR;
297 			}
298 			free($2);
299 		}
300 		| LOGO STRING {
301 			n = strlcpy(new_srv->logo, $2, sizeof(new_srv->logo));
302 			if (n >= sizeof(new_srv->logo)) {
303 				yyerror("%s: logo truncated", __func__);
304 				free($2);
305 				YYERROR;
306 			}
307 			free($2);
308 		}
309 		| LOGO_URL STRING {
310 			n = strlcpy(new_srv->logo_url, $2,
311 			    sizeof(new_srv->logo_url));
312 			if (n >= sizeof(new_srv->logo_url)) {
313 				yyerror("%s: logo_url truncated", __func__);
314 				free($2);
315 				YYERROR;
316 			}
317 			free($2);
318 		}
319 		| CUSTOM_CSS STRING {
320 			n = strlcpy(new_srv->custom_css, $2,
321 			    sizeof(new_srv->custom_css));
322 			if (n >= sizeof(new_srv->custom_css)) {
323 				yyerror("%s: custom_css truncated", __func__);
324 				free($2);
325 				YYERROR;
326 			}
327 			free($2);
328 		}
329 		| MAX_REPOS NUMBER {
330 			if ($2 > 0)
331 				new_srv->max_repos = $2;
332 		}
333 		| SHOW_SITE_OWNER boolean {
334 			new_srv->show_site_owner = $2;
335 		}
336 		| SHOW_REPO_OWNER boolean {
337 			new_srv->show_repo_owner = $2;
338 		}
339 		| SHOW_REPO_AGE boolean {
340 			new_srv->show_repo_age = $2;
341 		}
342 		| SHOW_REPO_DESCRIPTION boolean {
343 			new_srv->show_repo_description = $2;
344 		}
345 		| SHOW_REPO_CLONEURL boolean {
346 			new_srv->show_repo_cloneurl = $2;
347 		}
348 		| MAX_REPOS_DISPLAY NUMBER {
349 				new_srv->max_repos_display = $2;
350 		}
351 		| MAX_COMMITS_DISPLAY NUMBER {
352 			if ($2 > 0)
353 				new_srv->max_commits_display = $2;
354 		}
355 		| FCGI_SOCKET boolean {
356 			new_srv->fcgi_socket = $2;
357 		}
358 		| FCGI_SOCKET boolean  {
359 			new_srv->fcgi_socket = $2;
360 		} '{' optnl socketopts2 '}'
361 		| UNIX_SOCKET boolean {
362 			new_srv->unix_socket = $2;
363 		}
364 		| UNIX_SOCKET_NAME STRING {
365 			n = snprintf(new_srv->unix_socket_name,
366 			    sizeof(new_srv->unix_socket_name), "%s%s",
367 			    strlen(gotwebd->httpd_chroot) ?
368 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $2);
369 			if (n < 0) {
370 				yyerror("%s: unix_socket_name truncated",
371 				    __func__);
372 				free($2);
373 				YYERROR;
374 			}
375 			free($2);
376 		}
377 		;
378 
379 serveropts2	: serveropts2 serveropts1 nl
380 		| serveropts1 optnl
381 		;
382 
383 socketopts1	: BIND INTERFACE STRING {
384 			n = strlcpy(new_srv->fcgi_socket_bind, $3,
385 			    sizeof(new_srv->fcgi_socket_bind));
386 			if (n >= sizeof(new_srv->fcgi_socket_bind)) {
387 				yyerror("%s: fcgi_socket_bind truncated",
388 				    __func__);
389 				free($3);
390 				YYERROR;
391 			}
392 			free($3);
393 		}
394 		| PORT fcgiport {
395 			struct server	*srv;
396 
397 			TAILQ_FOREACH(srv, gotwebd->servers, entry) {
398 				if (srv->fcgi_socket_port == $2) {
399 					yyerror("port already assigned");
400 					YYERROR;
401 				}
402 			}
403 			new_srv->fcgi_socket_port = $2;
404 		}
405 		;
406 
407 socketopts2	: socketopts2 socketopts1 nl
408 		| socketopts1 optnl
409 		;
410 
411 socketopts3	: BIND INTERFACE STRING {
412 			n = strlcpy(gotwebd->fcgi_socket_bind, $3,
413 			    sizeof(gotwebd->fcgi_socket_bind));
414 			if (n >= sizeof(gotwebd->fcgi_socket_bind)) {
415 				yyerror("%s: fcgi_socket_bind truncated",
416 				    __func__);
417 				free($3);
418 				YYERROR;
419 			}
420 			free($3);
421 		}
422 		| PORT fcgiport {
423 			gotwebd->fcgi_socket_port = $2;
424 		}
425 		;
426 
427 socketopts4	: socketopts4 socketopts3 nl
428 		| socketopts3 optnl
429 		;
430 
431 nl		: '\n' optnl
432 		;
433 
434 optnl		: '\n' optnl		/* zero or more newlines */
435 		| /* empty */
436 		;
437 
438 %%
439 
440 struct keywords {
441 	const char	*k_name;
442 	int		 k_val;
443 };
444 
445 int
446 yyerror(const char *fmt, ...)
447 {
448 	va_list ap;
449 	char *msg;
450 
451 	file->errors++;
452 	va_start(ap, fmt);
453 	if (vasprintf(&msg, fmt, ap) == -1)
454 		fatalx("yyerror vasprintf");
455 	va_end(ap);
456 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
457 	free(msg);
458 	return (0);
459 }
460 
461 int
462 kw_cmp(const void *k, const void *e)
463 {
464 	return (strcmp(k, ((const struct keywords *)e)->k_name));
465 }
466 
467 int
468 lookup(char *s)
469 {
470 	/* This has to be sorted always. */
471 	static const struct keywords keywords[] = {
472 		{ "bind",			BIND },
473 		{ "chroot",			CHROOT },
474 		{ "custom_css",			CUSTOM_CSS },
475 		{ "fcgi_socket",		FCGI_SOCKET },
476 		{ "interface",			INTERFACE },
477 		{ "logo",			LOGO },
478 		{ "logo_url"	,		LOGO_URL },
479 		{ "max_commits_display",	MAX_COMMITS_DISPLAY },
480 		{ "max_repos",			MAX_REPOS },
481 		{ "max_repos_display",		MAX_REPOS_DISPLAY },
482 		{ "port",			PORT },
483 		{ "prefork",			PREFORK },
484 		{ "repos_path",			REPOS_PATH },
485 		{ "server",			SERVER },
486 		{ "show_repo_age",		SHOW_REPO_AGE },
487 		{ "show_repo_cloneurl",		SHOW_REPO_CLONEURL },
488 		{ "show_repo_description",	SHOW_REPO_DESCRIPTION },
489 		{ "show_repo_owner",		SHOW_REPO_OWNER },
490 		{ "show_site_owner",		SHOW_SITE_OWNER },
491 		{ "site_link",			SITE_LINK },
492 		{ "site_name",			SITE_NAME },
493 		{ "site_owner",			SITE_OWNER },
494 		{ "unix_socket",		UNIX_SOCKET },
495 		{ "unix_socket_name",		UNIX_SOCKET_NAME },
496 	};
497 	const struct keywords *p;
498 
499 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
500 	    sizeof(keywords[0]), kw_cmp);
501 
502 	if (p)
503 		return (p->k_val);
504 	else
505 		return (STRING);
506 }
507 
508 #define MAXPUSHBACK	128
509 
510 unsigned char *parsebuf;
511 int parseindex;
512 unsigned char pushback_buffer[MAXPUSHBACK];
513 int pushback_index = 0;
514 
515 int
516 lgetc(int quotec)
517 {
518 	int c, next;
519 
520 	if (parsebuf) {
521 		/* Read character from the parsebuffer instead of input. */
522 		if (parseindex >= 0) {
523 			c = parsebuf[parseindex++];
524 			if (c != '\0')
525 				return (c);
526 			parsebuf = NULL;
527 		} else
528 			parseindex++;
529 	}
530 
531 	if (pushback_index)
532 		return (pushback_buffer[--pushback_index]);
533 
534 	if (quotec) {
535 		c = getc(file->stream);
536 		if (c == EOF)
537 			yyerror("reached end of file while parsing "
538 			    "quoted string");
539 		return (c);
540 	}
541 
542 	c = getc(file->stream);
543 	while (c == '\\') {
544 		next = getc(file->stream);
545 		if (next != '\n') {
546 			c = next;
547 			break;
548 		}
549 		yylval.lineno = file->lineno;
550 		file->lineno++;
551 		c = getc(file->stream);
552 	}
553 
554 	return (c);
555 }
556 
557 int
558 lungetc(int c)
559 {
560 	if (c == EOF)
561 		return (EOF);
562 	if (parsebuf) {
563 		parseindex--;
564 		if (parseindex >= 0)
565 			return (c);
566 	}
567 	if (pushback_index < MAXPUSHBACK-1)
568 		return (pushback_buffer[pushback_index++] = c);
569 	else
570 		return (EOF);
571 }
572 
573 int
574 findeol(void)
575 {
576 	int c;
577 
578 	parsebuf = NULL;
579 
580 	/* Skip to either EOF or the first real EOL. */
581 	while (1) {
582 		if (pushback_index)
583 			c = pushback_buffer[--pushback_index];
584 		else
585 			c = lgetc(0);
586 		if (c == '\n') {
587 			file->lineno++;
588 			break;
589 		}
590 		if (c == EOF)
591 			break;
592 	}
593 	return (ERROR);
594 }
595 
596 int
597 yylex(void)
598 {
599 	unsigned char buf[8096];
600 	unsigned char *p, *val;
601 	int quotec, next, c;
602 	int token;
603 
604 top:
605 	p = buf;
606 	c = lgetc(0);
607 	while (c == ' ' || c == '\t')
608 		c = lgetc(0); /* nothing */
609 
610 	yylval.lineno = file->lineno;
611 	if (c == '#') {
612 		c = lgetc(0);
613 		while (c != '\n' && c != EOF)
614 			c = lgetc(0); /* nothing */
615 	}
616 	if (c == '$' && parsebuf == NULL) {
617 		while (1) {
618 			c = lgetc(0);
619 			if (c == EOF)
620 				return (0);
621 
622 			if (p + 1 >= buf + sizeof(buf) - 1) {
623 				yyerror("string too long");
624 				return (findeol());
625 			}
626 			if (isalnum(c) || c == '_') {
627 				*p++ = c;
628 				continue;
629 			}
630 			*p = '\0';
631 			lungetc(c);
632 			break;
633 		}
634 		val = symget(buf);
635 		if (val == NULL) {
636 			yyerror("macro '%s' not defined", buf);
637 			return (findeol());
638 		}
639 		parsebuf = val;
640 		parseindex = 0;
641 		goto top;
642 	}
643 
644 	switch (c) {
645 	case '\'':
646 	case '"':
647 		quotec = c;
648 		while (1) {
649 			c = lgetc(quotec);
650 			if (c == EOF)
651 				return (0);
652 			if (c == '\n') {
653 				file->lineno++;
654 				continue;
655 			} else if (c == '\\') {
656 				next = lgetc(quotec);
657 				if (next == EOF)
658 					return (0);
659 				if (next == quotec || c == ' ' || c == '\t')
660 					c = next;
661 				else if (next == '\n') {
662 					file->lineno++;
663 					continue;
664 				} else
665 					lungetc(next);
666 			} else if (c == quotec) {
667 				*p = '\0';
668 				break;
669 			} else if (c == '\0') {
670 				yyerror("syntax error");
671 				return (findeol());
672 			}
673 			if (p + 1 >= buf + sizeof(buf) - 1) {
674 				yyerror("string too long");
675 				return (findeol());
676 			}
677 			*p++ = c;
678 		}
679 		yylval.v.string = strdup(buf);
680 		if (yylval.v.string == NULL)
681 			err(1, "yylex: strdup");
682 		return (STRING);
683 	}
684 
685 #define allowed_to_end_number(x) \
686 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
687 
688 	if (c == '-' || isdigit(c)) {
689 		do {
690 			*p++ = c;
691 			if ((unsigned)(p-buf) >= sizeof(buf)) {
692 				yyerror("string too long");
693 				return (findeol());
694 			}
695 			c = lgetc(0);
696 		} while (c != EOF && isdigit(c));
697 		lungetc(c);
698 		if (p == buf + 1 && buf[0] == '-')
699 			goto nodigits;
700 		if (c == EOF || allowed_to_end_number(c)) {
701 			const char *errstr = NULL;
702 
703 			*p = '\0';
704 			yylval.v.number = strtonum(buf, LLONG_MIN,
705 			    LLONG_MAX, &errstr);
706 			if (errstr) {
707 				yyerror("\"%s\" invalid number: %s",
708 				    buf, errstr);
709 				return (findeol());
710 			}
711 			return (NUMBER);
712 		} else {
713 nodigits:
714 			while (p > buf + 1)
715 				lungetc(*--p);
716 			c = *--p;
717 			if (c == '-')
718 				return (c);
719 		}
720 	}
721 
722 #define allowed_in_string(x) \
723 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
724 	x != '{' && x != '}' && \
725 	x != '!' && x != '=' && x != '#' && \
726 	x != ','))
727 
728 	if (isalnum(c) || c == ':' || c == '_') {
729 		do {
730 			*p++ = c;
731 			if ((unsigned)(p-buf) >= sizeof(buf)) {
732 				yyerror("string too long");
733 				return (findeol());
734 			}
735 			c = lgetc(0);
736 		} while (c != EOF && (allowed_in_string(c)));
737 		lungetc(c);
738 		*p = '\0';
739 		token = lookup(buf);
740 		if (token == STRING) {
741 			yylval.v.string = strdup(buf);
742 			if (yylval.v.string == NULL)
743 				err(1, "yylex: strdup");
744 		}
745 		return (token);
746 	}
747 	if (c == '\n') {
748 		yylval.lineno = file->lineno;
749 		file->lineno++;
750 	}
751 	if (c == EOF)
752 		return (0);
753 	return (c);
754 }
755 
756 int
757 check_file_secrecy(int fd, const char *fname)
758 {
759 	struct stat st;
760 
761 	if (fstat(fd, &st)) {
762 		log_warn("cannot stat %s", fname);
763 		return (-1);
764 	}
765 	if (st.st_uid != 0 && st.st_uid != getuid()) {
766 		log_warnx("%s: owner not root or current user", fname);
767 		return (-1);
768 	}
769 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
770 		log_warnx("%s: group writable or world read/writable", fname);
771 		return (-1);
772 	}
773 	return (0);
774 }
775 
776 struct file *
777 newfile(const char *name, int secret)
778 {
779 	struct file *nfile;
780 
781 	nfile = calloc(1, sizeof(struct file));
782 	if (nfile == NULL) {
783 		log_warn("calloc");
784 		return (NULL);
785 	}
786 	nfile->name = strdup(name);
787 	if (nfile->name == NULL) {
788 		log_warn("strdup");
789 		free(nfile);
790 		return (NULL);
791 	}
792 	nfile->stream = fopen(nfile->name, "r");
793 	if (nfile->stream == NULL) {
794 		/* no warning, we don't require a conf file */
795 		free(nfile->name);
796 		free(nfile);
797 		return (NULL);
798 	} else if (secret &&
799 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
800 		fclose(nfile->stream);
801 		free(nfile->name);
802 		free(nfile);
803 		return (NULL);
804 	}
805 	nfile->lineno = 1;
806 	return (nfile);
807 }
808 
809 static void
810 closefile(struct file *xfile)
811 {
812 	fclose(xfile->stream);
813 	free(xfile->name);
814 	free(xfile);
815 }
816 
817 static void
818 add_default_server(void)
819 {
820 	new_srv = conf_new_server(D_SITENAME);
821 	log_debug("%s: adding default server %s", __func__, D_SITENAME);
822 }
823 
824 int
825 parse_config(const char *filename, struct gotwebd *env)
826 {
827 	struct sym *sym, *next;
828 
829 	if (config_init(env) == -1)
830 		fatalx("failed to initialize configuration");
831 
832 	gotwebd = env;
833 
834 	file = newfile(filename, 0);
835 	if (file == NULL) {
836 		add_default_server();
837 		sockets_parse_sockets(env);
838 		/* just return, as we don't require a conf file */
839 		return (0);
840 	}
841 
842 	yyparse();
843 	errors = file->errors;
844 	closefile(file);
845 
846 	/* Free macros and check which have not been used. */
847 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
848 		if ((gotwebd->gotwebd_verbose > 1) && !sym->used)
849 			fprintf(stderr, "warning: macro '%s' not used\n",
850 			    sym->nam);
851 		if (!sym->persist) {
852 			free(sym->nam);
853 			free(sym->val);
854 			TAILQ_REMOVE(&symhead, sym, entry);
855 			free(sym);
856 		}
857 	}
858 
859 	if (errors)
860 		return (-1);
861 
862 	/* just add default server if no config specified */
863 	if (gotwebd->server_cnt == 0)
864 		add_default_server();
865 
866 	/* setup our listening sockets */
867 	sockets_parse_sockets(env);
868 
869 	return (0);
870 }
871 
872 struct server *
873 conf_new_server(const char *name)
874 {
875 	struct server *srv = NULL;
876 	int val;
877 
878 	srv = calloc(1, sizeof(*srv));
879 	if (srv == NULL)
880 		fatalx("%s: calloc", __func__);
881 
882 	n = strlcpy(srv->name, name, sizeof(srv->name));
883 	if (n >= sizeof(srv->name))
884 		fatalx("%s: strlcpy", __func__);
885 	n = snprintf(srv->unix_socket_name,
886 	    sizeof(srv->unix_socket_name), "%s%s", D_HTTPD_CHROOT,
887 	    D_UNIX_SOCKET);
888 	if (n < 0)
889 		fatalx("%s: snprintf", __func__);
890 	n = strlcpy(srv->repos_path, D_GOTPATH,
891 	    sizeof(srv->repos_path));
892 	if (n >= sizeof(srv->repos_path))
893 		fatalx("%s: strlcpy", __func__);
894 	n = strlcpy(srv->site_name, D_SITENAME,
895 	    sizeof(srv->site_name));
896 	if (n >= sizeof(srv->site_name))
897 		fatalx("%s: strlcpy", __func__);
898 	n = strlcpy(srv->site_owner, D_SITEOWNER,
899 	    sizeof(srv->site_owner));
900 	if (n >= sizeof(srv->site_owner))
901 		fatalx("%s: strlcpy", __func__);
902 	n = strlcpy(srv->site_link, D_SITELINK,
903 	    sizeof(srv->site_link));
904 	if (n >= sizeof(srv->site_link))
905 		fatalx("%s: strlcpy", __func__);
906 	n = strlcpy(srv->logo, D_GOTLOGO,
907 	    sizeof(srv->logo));
908 	if (n >= sizeof(srv->logo))
909 		fatalx("%s: strlcpy", __func__);
910 	n = strlcpy(srv->logo_url, D_GOTURL, sizeof(srv->logo_url));
911 	if (n >= sizeof(srv->logo_url))
912 		fatalx("%s: strlcpy", __func__);
913 	n = strlcpy(srv->custom_css, D_GOTWEBCSS, sizeof(srv->custom_css));
914 	if (n >= sizeof(srv->custom_css))
915 		fatalx("%s: strlcpy", __func__);
916 
917 	val = getservice(D_FCGI_PORT);
918 	srv->fcgi_socket_port = gotwebd->fcgi_socket_port ?
919 	    gotwebd->fcgi_socket_port: htons(val);
920 
921 	srv->show_site_owner = D_SHOWSOWNER;
922 	srv->show_repo_owner = D_SHOWROWNER;
923 	srv->show_repo_age = D_SHOWAGE;
924 	srv->show_repo_description = D_SHOWDESC;
925 	srv->show_repo_cloneurl = D_SHOWURL;
926 
927 	srv->max_repos_display = D_MAXREPODISP;
928 	srv->max_commits_display = D_MAXCOMMITDISP;
929 	srv->max_repos = D_MAXREPO;
930 
931 	srv->unix_socket = 1;
932 	srv->fcgi_socket = gotwebd->fcgi_socket ? gotwebd->fcgi_socket : 0;
933 
934 	if ((srv->al = calloc(1, sizeof(*srv->al))) == NULL)
935 		fatalx("%s: calloc", __func__);
936 
937 	TAILQ_INIT(srv->al);
938 	TAILQ_INSERT_TAIL(gotwebd->servers, srv, entry);
939 	gotwebd->server_cnt++;
940 
941 	return srv;
942 };
943 
944 int
945 symset(const char *nam, const char *val, int persist)
946 {
947 	struct sym *sym;
948 
949 	TAILQ_FOREACH(sym, &symhead, entry) {
950 		if (strcmp(nam, sym->nam) == 0)
951 			break;
952 	}
953 
954 	if (sym != NULL) {
955 		if (sym->persist == 1)
956 			return (0);
957 		else {
958 			free(sym->nam);
959 			free(sym->val);
960 			TAILQ_REMOVE(&symhead, sym, entry);
961 			free(sym);
962 		}
963 	}
964 	sym = calloc(1, sizeof(*sym));
965 	if (sym == NULL)
966 		return (-1);
967 
968 	sym->nam = strdup(nam);
969 	if (sym->nam == NULL) {
970 		free(sym);
971 		return (-1);
972 	}
973 	sym->val = strdup(val);
974 	if (sym->val == NULL) {
975 		free(sym->nam);
976 		free(sym);
977 		return (-1);
978 	}
979 	sym->used = 0;
980 	sym->persist = persist;
981 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
982 	return (0);
983 }
984 
985 int
986 cmdline_symset(char *s)
987 {
988 	char *sym, *val;
989 	int ret;
990 	size_t len;
991 
992 	val = strrchr(s, '=');
993 	if (val == NULL)
994 		return (-1);
995 
996 	len = strlen(s) - strlen(val) + 1;
997 	sym = malloc(len);
998 	if (sym == NULL)
999 		fatal("%s: malloc", __func__);
1000 
1001 	memcpy(&sym, s, len);
1002 
1003 	ret = symset(sym, val + 1, 1);
1004 	free(sym);
1005 
1006 	return (ret);
1007 }
1008 
1009 char *
1010 symget(const char *nam)
1011 {
1012 	struct sym *sym;
1013 
1014 	TAILQ_FOREACH(sym, &symhead, entry) {
1015 		if (strcmp(nam, sym->nam) == 0) {
1016 			sym->used = 1;
1017 			return (sym->val);
1018 		}
1019 	}
1020 	return (NULL);
1021 }
1022 
1023 int
1024 getservice(const char *n)
1025 {
1026 	struct servent *s;
1027 	const char *errstr;
1028 	long long llval;
1029 
1030 	llval = strtonum(n, 0, UINT16_MAX, &errstr);
1031 	if (errstr) {
1032 		s = getservbyname(n, "tcp");
1033 		if (s == NULL)
1034 			s = getservbyname(n, "udp");
1035 		if (s == NULL)
1036 			return (-1);
1037 		return (s->s_port);
1038 	}
1039 
1040 	return (htons((unsigned short)llval));
1041 }
1042 
1043 struct address *
1044 host_v4(const char *s)
1045 {
1046 	struct in_addr ina;
1047 	struct sockaddr_in *sain;
1048 	struct address *h;
1049 
1050 	memset(&ina, 0, sizeof(ina));
1051 	if (inet_pton(AF_INET, s, &ina) != 1)
1052 		return (NULL);
1053 
1054 	if ((h = calloc(1, sizeof(*h))) == NULL)
1055 		fatal(__func__);
1056 	sain = (struct sockaddr_in *)&h->ss;
1057 	got_sockaddr_inet_init(sain, &ina);
1058 	if (sain->sin_addr.s_addr == INADDR_ANY)
1059 		h->prefixlen = 0; /* 0.0.0.0 address */
1060 	else
1061 		h->prefixlen = -1; /* host address */
1062 	return (h);
1063 }
1064 
1065 struct address *
1066 host_v6(const char *s)
1067 {
1068 	struct addrinfo hints, *res;
1069 	struct sockaddr_in6 *sa_in6, *ra;
1070 	struct address *h = NULL;
1071 
1072 	memset(&hints, 0, sizeof(hints));
1073 	hints.ai_family = AF_INET6;
1074 	hints.ai_socktype = SOCK_DGRAM; /* dummy */
1075 	hints.ai_flags = AI_NUMERICHOST;
1076 	if (getaddrinfo(s, "0", &hints, &res) == 0) {
1077 		if ((h = calloc(1, sizeof(*h))) == NULL)
1078 			fatal(__func__);
1079 		sa_in6 = (struct sockaddr_in6 *)&h->ss;
1080 		ra = (struct sockaddr_in6 *)res->ai_addr;
1081 		got_sockaddr_inet6_init(sa_in6, &ra->sin6_addr,
1082 		    ra->sin6_scope_id);
1083 		if (memcmp(&sa_in6->sin6_addr, &in6addr_any,
1084 		    sizeof(sa_in6->sin6_addr)) == 0)
1085 			h->prefixlen = 0; /* any address */
1086 		else
1087 			h->prefixlen = -1; /* host address */
1088 		freeaddrinfo(res);
1089 	}
1090 
1091 	return (h);
1092 }
1093 
1094 int
1095 host_dns(const char *s, struct addresslist *al, int max,
1096     in_port_t port, const char *ifname, int ipproto)
1097 {
1098 	struct addrinfo hints, *res0, *res;
1099 	int error, cnt = 0;
1100 	struct sockaddr_in *sain;
1101 	struct sockaddr_in6 *sin6;
1102 	struct address *h;
1103 
1104 	if ((cnt = host_if(s, al, max, port, ifname, ipproto)) != 0)
1105 		return (cnt);
1106 
1107 	memset(&hints, 0, sizeof(hints));
1108 	hints.ai_family = PF_UNSPEC;
1109 	hints.ai_socktype = SOCK_DGRAM; /* DUMMY */
1110 	hints.ai_flags = AI_ADDRCONFIG;
1111 	error = getaddrinfo(s, NULL, &hints, &res0);
1112 	if (error == EAI_AGAIN || error == EAI_NODATA || error == EAI_NONAME)
1113 		return (0);
1114 	if (error) {
1115 		log_warnx("%s: could not parse \"%s\": %s", __func__, s,
1116 		    gai_strerror(error));
1117 		return (-1);
1118 	}
1119 
1120 	for (res = res0; res && cnt < max; res = res->ai_next) {
1121 		if (res->ai_family != AF_INET &&
1122 		    res->ai_family != AF_INET6)
1123 			continue;
1124 		if ((h = calloc(1, sizeof(*h))) == NULL)
1125 			fatal(__func__);
1126 
1127 		if (port)
1128 			h->port = port;
1129 		if (ifname != NULL) {
1130 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1131 			    sizeof(h->ifname)) {
1132 				log_warnx("%s: interface name truncated",
1133 				    __func__);
1134 				freeaddrinfo(res0);
1135 				free(h);
1136 				return (-1);
1137 			}
1138 		}
1139 		if (ipproto != -1)
1140 			h->ipproto = ipproto;
1141 		h->ss.ss_family = res->ai_family;
1142 		h->prefixlen = -1; /* host address */
1143 
1144 		if (res->ai_family == AF_INET) {
1145 			struct sockaddr_in *ra;
1146 			sain = (struct sockaddr_in *)&h->ss;
1147 			ra = (struct sockaddr_in *)res->ai_addr;
1148 			got_sockaddr_inet_init(sain, &ra->sin_addr);
1149 		} else {
1150 			struct sockaddr_in6 *ra;
1151 			sin6 = (struct sockaddr_in6 *)&h->ss;
1152 			ra = (struct sockaddr_in6 *)res->ai_addr;
1153 			got_sockaddr_inet6_init(sin6, &ra->sin6_addr, 0);
1154 		}
1155 
1156 		TAILQ_INSERT_HEAD(al, h, entry);
1157 		cnt++;
1158 	}
1159 	if (cnt == max && res) {
1160 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1161 		    s, max);
1162 	}
1163 	freeaddrinfo(res0);
1164 	return (cnt);
1165 }
1166 
1167 int
1168 host_if(const char *s, struct addresslist *al, int max,
1169     in_port_t port, const char *ifname, int ipproto)
1170 {
1171 	struct ifaddrs *ifap, *p;
1172 	struct sockaddr_in *sain;
1173 	struct sockaddr_in6 *sin6;
1174 	struct address *h;
1175 	int cnt = 0, af;
1176 
1177 	if (getifaddrs(&ifap) == -1)
1178 		fatal("getifaddrs");
1179 
1180 	/* First search for IPv4 addresses */
1181 	af = AF_INET;
1182 
1183  nextaf:
1184 	for (p = ifap; p != NULL && cnt < max; p = p->ifa_next) {
1185 		if (p->ifa_addr == NULL ||
1186 		    p->ifa_addr->sa_family != af ||
1187 		    (strcmp(s, p->ifa_name) != 0 &&
1188 		    !is_if_in_group(p->ifa_name, s)))
1189 			continue;
1190 		if ((h = calloc(1, sizeof(*h))) == NULL)
1191 			fatal("calloc");
1192 
1193 		if (port)
1194 			h->port = port;
1195 		if (ifname != NULL) {
1196 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1197 			    sizeof(h->ifname)) {
1198 				log_warnx("%s: interface name truncated",
1199 				    __func__);
1200 				free(h);
1201 				freeifaddrs(ifap);
1202 				return (-1);
1203 			}
1204 		}
1205 		if (ipproto != -1)
1206 			h->ipproto = ipproto;
1207 		h->ss.ss_family = af;
1208 		h->prefixlen = -1; /* host address */
1209 
1210 		if (af == AF_INET) {
1211 			struct sockaddr_in *ra;
1212 			sain = (struct sockaddr_in *)&h->ss;
1213 			ra = (struct sockaddr_in *)p->ifa_addr;
1214 			got_sockaddr_inet_init(sain, &ra->sin_addr);
1215 		} else {
1216 			struct sockaddr_in6 *ra;
1217 			sin6 = (struct sockaddr_in6 *)&h->ss;
1218 			ra = (struct sockaddr_in6 *)p->ifa_addr;
1219 			got_sockaddr_inet6_init(sin6, &ra->sin6_addr,
1220 			    ra->sin6_scope_id);
1221 		}
1222 
1223 		TAILQ_INSERT_HEAD(al, h, entry);
1224 		cnt++;
1225 	}
1226 	if (af == AF_INET) {
1227 		/* Next search for IPv6 addresses */
1228 		af = AF_INET6;
1229 		goto nextaf;
1230 	}
1231 
1232 	if (cnt > max) {
1233 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1234 		    s, max);
1235 	}
1236 	freeifaddrs(ifap);
1237 	return (cnt);
1238 }
1239 
1240 int
1241 host(const char *s, struct addresslist *al, int max,
1242     in_port_t port, const char *ifname, int ipproto)
1243 {
1244 	struct address *h;
1245 
1246 	h = host_v4(s);
1247 
1248 	/* IPv6 address? */
1249 	if (h == NULL)
1250 		h = host_v6(s);
1251 
1252 	if (h != NULL) {
1253 		if (port)
1254 			h->port = port;
1255 		if (ifname != NULL) {
1256 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1257 			    sizeof(h->ifname)) {
1258 				log_warnx("%s: interface name truncated",
1259 				    __func__);
1260 				free(h);
1261 				return (-1);
1262 			}
1263 		}
1264 		if (ipproto != -1)
1265 			h->ipproto = ipproto;
1266 
1267 		TAILQ_INSERT_HEAD(al, h, entry);
1268 		return (1);
1269 	}
1270 
1271 	return (host_dns(s, al, max, port, ifname, ipproto));
1272 }
1273 
1274 int
1275 is_if_in_group(const char *ifname, const char *groupname)
1276 {
1277 /* TA: Check this... */
1278 #ifdef HAVE_STRUCT_IFGROUPREQ
1279 	unsigned int len;
1280 	struct ifgroupreq ifgr;
1281 	struct ifg_req *ifg;
1282 	int s;
1283 	int ret = 0;
1284 
1285 	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
1286 		err(1, "socket");
1287 
1288 	memset(&ifgr, 0, sizeof(ifgr));
1289 	if (strlcpy(ifgr.ifgr_name, ifname, IFNAMSIZ) >= IFNAMSIZ)
1290 		err(1, "IFNAMSIZ");
1291 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1) {
1292 		if (errno == EINVAL || errno == ENOTTY)
1293 			goto end;
1294 		err(1, "SIOCGIFGROUP");
1295 	}
1296 
1297 	len = ifgr.ifgr_len;
1298 	ifgr.ifgr_groups = calloc(len / sizeof(struct ifg_req),
1299 	    sizeof(struct ifg_req));
1300 	if (ifgr.ifgr_groups == NULL)
1301 		err(1, "getifgroups");
1302 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1)
1303 		err(1, "SIOCGIFGROUP");
1304 
1305 	ifg = ifgr.ifgr_groups;
1306 	for (; ifg && len >= sizeof(struct ifg_req); ifg++) {
1307 		len -= sizeof(struct ifg_req);
1308 		if (strcmp(ifg->ifgrq_group, groupname) == 0) {
1309 			ret = 1;
1310 			break;
1311 		}
1312 	}
1313 	free(ifgr.ifgr_groups);
1314 
1315 end:
1316 	close(s);
1317 	return (ret);
1318 #else
1319 	return (0);
1320 #endif
1321 }
1322 
1323 int
1324 get_addrs(const char *addr, struct addresslist *al, in_port_t port)
1325 {
1326 	if (strcmp("", addr) == 0) {
1327 		if (host("0.0.0.0", al, 1, port, "0.0.0.0", -1) <= 0) {
1328 			yyerror("invalid listen ip: %s",
1329 			    "0.0.0.0");
1330 			return (-1);
1331 		}
1332 		if (host("::", al, 1, port, "::", -1) <= 0) {
1333 			yyerror("invalid listen ip: %s", "::");
1334 			return (-1);
1335 		}
1336 	} else {
1337 		if (host(addr, al, GOTWEBD_MAXIFACE, port, addr,
1338 		    -1) <= 0) {
1339 			yyerror("invalid listen ip: %s", addr);
1340 			return (-1);
1341 		}
1342 	}
1343 	return (0);
1344 }