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 "got_compat.h"
25 
26 #include <sys/ioctl.h>
27 #include <sys/types.h>
28 #include <sys/queue.h>
29 #include <sys/socket.h>
30 #include <sys/stat.h>
31 
32 #include <net/if.h>
33 #include <netinet/in.h>
34 
35 #include <arpa/inet.h>
36 
37 #include <ctype.h>
38 #include <err.h>
39 #include <errno.h>
40 #include <event.h>
41 #include <ifaddrs.h>
42 #include <limits.h>
43 #include <netdb.h>
44 #include <stdarg.h>
45 #include <stdlib.h>
46 #include <stdio.h>
47 #include <string.h>
48 #include <syslog.h>
49 #include <unistd.h>
50 
51 #include "got_sockaddr.h"
52 #include "got_reference.h"
53 
54 #include "proc.h"
55 #include "gotwebd.h"
56 
57 TAILQ_HEAD(files, file)		 files = TAILQ_HEAD_INITIALIZER(files);
58 static struct file {
59 	TAILQ_ENTRY(file)	 entry;
60 	FILE			*stream;
61 	char			*name;
62 	int			 lineno;
63 	int			 errors;
64 } *file;
65 struct file	*newfile(const char *, int);
66 static void	 closefile(struct file *);
67 int		 check_file_secrecy(int, const char *);
68 int		 yyparse(void);
69 int		 yylex(void);
70 int		 yyerror(const char *, ...)
71     __attribute__((__format__ (printf, 1, 2)))
72     __attribute__((__nonnull__ (1)));
73 int		 kw_cmp(const void *, const void *);
74 int		 lookup(char *);
75 int		 lgetc(int);
76 int		 lungetc(int);
77 int		 findeol(void);
78 
79 TAILQ_HEAD(symhead, sym)	 symhead = TAILQ_HEAD_INITIALIZER(symhead);
80 struct sym {
81 	TAILQ_ENTRY(sym)	 entry;
82 	int			 used;
83 	int			 persist;
84 	char			*nam;
85 	char			*val;
86 };
87 
88 int	 symset(const char *, const char *, int);
89 char	*symget(const char *);
90 
91 static int		 errors;
92 
93 static struct gotwebd		*gotwebd;
94 static struct server		*new_srv;
95 static struct server		*conf_new_server(const char *);
96 int				 getservice(const char *);
97 int				 n;
98 
99 int		 get_addrs(const char *, struct server *, in_port_t);
100 int		 addr_dup_check(struct addresslist *, struct address *,
101 		    const char *, const char *);
102 int		 add_addr(struct server *, struct address *);
103 int		 host(const char *, struct server *,
104 		    int, in_port_t, const char *, int);
105 int		 host_if(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 SOCKET
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 		| LISTEN ON SOCKET STRING {
342 			if (!strcasecmp($4, "off") ||
343 			    !strcasecmp($4, "no")) {
344 				new_srv->unix_socket = 0;
345 				free($4);
346 				YYACCEPT;
347 			}
348 
349 			new_srv->unix_socket = 1;
350 
351 			n = snprintf(new_srv->unix_socket_name,
352 			    sizeof(new_srv->unix_socket_name), "%s%s",
353 			    strlen(gotwebd->httpd_chroot) ?
354 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $4);
355 			if (n < 0 ||
356 			    (size_t)n >= sizeof(new_srv->unix_socket_name)) {
357 				yyerror("%s: unix_socket_name truncated",
358 				    __func__);
359 				free($4);
360 				YYERROR;
361 			}
362 			free($4);
363 		}
364 		| MAX_REPOS NUMBER {
365 			if ($2 > 0)
366 				new_srv->max_repos = $2;
367 		}
368 		| SHOW_SITE_OWNER boolean {
369 			new_srv->show_site_owner = $2;
370 		}
371 		| SHOW_REPO_OWNER boolean {
372 			new_srv->show_repo_owner = $2;
373 		}
374 		| SHOW_REPO_AGE boolean {
375 			new_srv->show_repo_age = $2;
376 		}
377 		| SHOW_REPO_DESCRIPTION boolean {
378 			new_srv->show_repo_description = $2;
379 		}
380 		| SHOW_REPO_CLONEURL boolean {
381 			new_srv->show_repo_cloneurl = $2;
382 		}
383 		| RESPECT_EXPORTOK boolean {
384 			new_srv->respect_exportok = $2;
385 		}
386 		| MAX_REPOS_DISPLAY NUMBER {
387 				new_srv->max_repos_display = $2;
388 		}
389 		| MAX_COMMITS_DISPLAY NUMBER {
390 			if ($2 > 0)
391 				new_srv->max_commits_display = $2;
392 		}
393 		;
394 
395 serveropts2	: serveropts2 serveropts1 nl
396 		| serveropts1 optnl
397 		;
398 
399 nl		: '\n' optnl
400 		;
401 
402 optnl		: '\n' optnl		/* zero or more newlines */
403 		| /* empty */
404 		;
405 
406 %%
407 
408 struct keywords {
409 	const char	*k_name;
410 	int		 k_val;
411 };
412 
413 int
414 yyerror(const char *fmt, ...)
415 {
416 	va_list ap;
417 	char *msg;
418 
419 	file->errors++;
420 	va_start(ap, fmt);
421 	if (vasprintf(&msg, fmt, ap) == -1)
422 		fatalx("yyerror vasprintf");
423 	va_end(ap);
424 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
425 	free(msg);
426 	return (0);
427 }
428 
429 int
430 kw_cmp(const void *k, const void *e)
431 {
432 	return (strcmp(k, ((const struct keywords *)e)->k_name));
433 }
434 
435 int
436 lookup(char *s)
437 {
438 	/* This has to be sorted always. */
439 	static const struct keywords keywords[] = {
440 		{ "chroot",			CHROOT },
441 		{ "custom_css",			CUSTOM_CSS },
442 		{ "listen",			LISTEN },
443 		{ "logo",			LOGO },
444 		{ "logo_url",			LOGO_URL },
445 		{ "max_commits_display",	MAX_COMMITS_DISPLAY },
446 		{ "max_repos",			MAX_REPOS },
447 		{ "max_repos_display",		MAX_REPOS_DISPLAY },
448 		{ "on",				ON },
449 		{ "port",			PORT },
450 		{ "prefork",			PREFORK },
451 		{ "repos_path",			REPOS_PATH },
452 		{ "respect_exportok",		RESPECT_EXPORTOK },
453 		{ "server",			SERVER },
454 		{ "show_repo_age",		SHOW_REPO_AGE },
455 		{ "show_repo_cloneurl",		SHOW_REPO_CLONEURL },
456 		{ "show_repo_description",	SHOW_REPO_DESCRIPTION },
457 		{ "show_repo_owner",		SHOW_REPO_OWNER },
458 		{ "show_site_owner",		SHOW_SITE_OWNER },
459 		{ "site_link",			SITE_LINK },
460 		{ "site_name",			SITE_NAME },
461 		{ "site_owner",			SITE_OWNER },
462 		{ "socket",			SOCKET },
463 		{ "unix_socket",		UNIX_SOCKET },
464 		{ "unix_socket_name",		UNIX_SOCKET_NAME },
465 	};
466 	const struct keywords *p;
467 
468 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
469 	    sizeof(keywords[0]), kw_cmp);
470 
471 	if (p)
472 		return (p->k_val);
473 	else
474 		return (STRING);
475 }
476 
477 #define MAXPUSHBACK	128
478 
479 unsigned char *parsebuf;
480 int parseindex;
481 unsigned char pushback_buffer[MAXPUSHBACK];
482 int pushback_index = 0;
483 
484 int
485 lgetc(int quotec)
486 {
487 	int c, next;
488 
489 	if (parsebuf) {
490 		/* Read character from the parsebuffer instead of input. */
491 		if (parseindex >= 0) {
492 			c = parsebuf[parseindex++];
493 			if (c != '\0')
494 				return (c);
495 			parsebuf = NULL;
496 		} else
497 			parseindex++;
498 	}
499 
500 	if (pushback_index)
501 		return (pushback_buffer[--pushback_index]);
502 
503 	if (quotec) {
504 		c = getc(file->stream);
505 		if (c == EOF)
506 			yyerror("reached end of file while parsing "
507 			    "quoted string");
508 		return (c);
509 	}
510 
511 	c = getc(file->stream);
512 	while (c == '\\') {
513 		next = getc(file->stream);
514 		if (next != '\n') {
515 			c = next;
516 			break;
517 		}
518 		yylval.lineno = file->lineno;
519 		file->lineno++;
520 		c = getc(file->stream);
521 	}
522 
523 	return (c);
524 }
525 
526 int
527 lungetc(int c)
528 {
529 	if (c == EOF)
530 		return (EOF);
531 	if (parsebuf) {
532 		parseindex--;
533 		if (parseindex >= 0)
534 			return (c);
535 	}
536 	if (pushback_index < MAXPUSHBACK-1)
537 		return (pushback_buffer[pushback_index++] = c);
538 	else
539 		return (EOF);
540 }
541 
542 int
543 findeol(void)
544 {
545 	int c;
546 
547 	parsebuf = NULL;
548 
549 	/* Skip to either EOF or the first real EOL. */
550 	while (1) {
551 		if (pushback_index)
552 			c = pushback_buffer[--pushback_index];
553 		else
554 			c = lgetc(0);
555 		if (c == '\n') {
556 			file->lineno++;
557 			break;
558 		}
559 		if (c == EOF)
560 			break;
561 	}
562 	return (ERROR);
563 }
564 
565 int
566 yylex(void)
567 {
568 	unsigned char buf[8096];
569 	unsigned char *p, *val;
570 	int quotec, next, c;
571 	int token;
572 
573 top:
574 	p = buf;
575 	c = lgetc(0);
576 	while (c == ' ' || c == '\t')
577 		c = lgetc(0); /* nothing */
578 
579 	yylval.lineno = file->lineno;
580 	if (c == '#') {
581 		c = lgetc(0);
582 		while (c != '\n' && c != EOF)
583 			c = lgetc(0); /* nothing */
584 	}
585 	if (c == '$' && parsebuf == NULL) {
586 		while (1) {
587 			c = lgetc(0);
588 			if (c == EOF)
589 				return (0);
590 
591 			if (p + 1 >= buf + sizeof(buf) - 1) {
592 				yyerror("string too long");
593 				return (findeol());
594 			}
595 			if (isalnum(c) || c == '_') {
596 				*p++ = c;
597 				continue;
598 			}
599 			*p = '\0';
600 			lungetc(c);
601 			break;
602 		}
603 		val = symget(buf);
604 		if (val == NULL) {
605 			yyerror("macro '%s' not defined", buf);
606 			return (findeol());
607 		}
608 		parsebuf = val;
609 		parseindex = 0;
610 		goto top;
611 	}
612 
613 	switch (c) {
614 	case '\'':
615 	case '"':
616 		quotec = c;
617 		while (1) {
618 			c = lgetc(quotec);
619 			if (c == EOF)
620 				return (0);
621 			if (c == '\n') {
622 				file->lineno++;
623 				continue;
624 			} else if (c == '\\') {
625 				next = lgetc(quotec);
626 				if (next == EOF)
627 					return (0);
628 				if (next == quotec || c == ' ' || c == '\t')
629 					c = next;
630 				else if (next == '\n') {
631 					file->lineno++;
632 					continue;
633 				} else
634 					lungetc(next);
635 			} else if (c == quotec) {
636 				*p = '\0';
637 				break;
638 			} else if (c == '\0') {
639 				yyerror("syntax error");
640 				return (findeol());
641 			}
642 			if (p + 1 >= buf + sizeof(buf) - 1) {
643 				yyerror("string too long");
644 				return (findeol());
645 			}
646 			*p++ = c;
647 		}
648 		yylval.v.string = strdup(buf);
649 		if (yylval.v.string == NULL)
650 			err(1, "yylex: strdup");
651 		return (STRING);
652 	}
653 
654 #define allowed_to_end_number(x) \
655 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
656 
657 	if (c == '-' || isdigit(c)) {
658 		do {
659 			*p++ = c;
660 			if ((unsigned)(p-buf) >= sizeof(buf)) {
661 				yyerror("string too long");
662 				return (findeol());
663 			}
664 			c = lgetc(0);
665 		} while (c != EOF && isdigit(c));
666 		lungetc(c);
667 		if (p == buf + 1 && buf[0] == '-')
668 			goto nodigits;
669 		if (c == EOF || allowed_to_end_number(c)) {
670 			const char *errstr = NULL;
671 
672 			*p = '\0';
673 			yylval.v.number = strtonum(buf, LLONG_MIN,
674 			    LLONG_MAX, &errstr);
675 			if (errstr) {
676 				yyerror("\"%s\" invalid number: %s",
677 				    buf, errstr);
678 				return (findeol());
679 			}
680 			return (NUMBER);
681 		} else {
682 nodigits:
683 			while (p > buf + 1)
684 				lungetc(*--p);
685 			c = *--p;
686 			if (c == '-')
687 				return (c);
688 		}
689 	}
690 
691 #define allowed_in_string(x) \
692 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
693 	x != '{' && x != '}' && \
694 	x != '!' && x != '=' && x != '#' && \
695 	x != ','))
696 
697 	if (isalnum(c) || c == ':' || c == '_') {
698 		do {
699 			*p++ = c;
700 			if ((unsigned)(p-buf) >= sizeof(buf)) {
701 				yyerror("string too long");
702 				return (findeol());
703 			}
704 			c = lgetc(0);
705 		} while (c != EOF && (allowed_in_string(c)));
706 		lungetc(c);
707 		*p = '\0';
708 		token = lookup(buf);
709 		if (token == STRING) {
710 			yylval.v.string = strdup(buf);
711 			if (yylval.v.string == NULL)
712 				err(1, "yylex: strdup");
713 		}
714 		return (token);
715 	}
716 	if (c == '\n') {
717 		yylval.lineno = file->lineno;
718 		file->lineno++;
719 	}
720 	if (c == EOF)
721 		return (0);
722 	return (c);
723 }
724 
725 int
726 check_file_secrecy(int fd, const char *fname)
727 {
728 	struct stat st;
729 
730 	if (fstat(fd, &st)) {
731 		log_warn("cannot stat %s", fname);
732 		return (-1);
733 	}
734 	if (st.st_uid != 0 && st.st_uid != getuid()) {
735 		log_warnx("%s: owner not root or current user", fname);
736 		return (-1);
737 	}
738 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
739 		log_warnx("%s: group writable or world read/writable", fname);
740 		return (-1);
741 	}
742 	return (0);
743 }
744 
745 struct file *
746 newfile(const char *name, int secret)
747 {
748 	struct file *nfile;
749 
750 	nfile = calloc(1, sizeof(struct file));
751 	if (nfile == NULL) {
752 		log_warn("calloc");
753 		return (NULL);
754 	}
755 	nfile->name = strdup(name);
756 	if (nfile->name == NULL) {
757 		log_warn("strdup");
758 		free(nfile);
759 		return (NULL);
760 	}
761 	nfile->stream = fopen(nfile->name, "r");
762 	if (nfile->stream == NULL) {
763 		/* no warning, we don't require a conf file */
764 		free(nfile->name);
765 		free(nfile);
766 		return (NULL);
767 	} else if (secret &&
768 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
769 		fclose(nfile->stream);
770 		free(nfile->name);
771 		free(nfile);
772 		return (NULL);
773 	}
774 	nfile->lineno = 1;
775 	return (nfile);
776 }
777 
778 static void
779 closefile(struct file *xfile)
780 {
781 	fclose(xfile->stream);
782 	free(xfile->name);
783 	free(xfile);
784 }
785 
786 static void
787 add_default_server(void)
788 {
789 	new_srv = conf_new_server(D_SITENAME);
790 	log_debug("%s: adding default server %s", __func__, D_SITENAME);
791 }
792 
793 int
794 parse_config(const char *filename, struct gotwebd *env)
795 {
796 	struct sym *sym, *next;
797 
798 	if (config_init(env) == -1)
799 		fatalx("failed to initialize configuration");
800 
801 	gotwebd = env;
802 
803 	file = newfile(filename, 0);
804 	if (file == NULL) {
805 		add_default_server();
806 		sockets_parse_sockets(env);
807 		/* just return, as we don't require a conf file */
808 		return (0);
809 	}
810 
811 	yyparse();
812 	errors = file->errors;
813 	closefile(file);
814 
815 	/* Free macros and check which have not been used. */
816 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
817 		if ((gotwebd->gotwebd_verbose > 1) && !sym->used)
818 			fprintf(stderr, "warning: macro '%s' not used\n",
819 			    sym->nam);
820 		if (!sym->persist) {
821 			free(sym->nam);
822 			free(sym->val);
823 			TAILQ_REMOVE(&symhead, sym, entry);
824 			free(sym);
825 		}
826 	}
827 
828 	if (errors)
829 		return (-1);
830 
831 	/* just add default server if no config specified */
832 	if (gotwebd->server_cnt == 0)
833 		add_default_server();
834 
835 	/* setup our listening sockets */
836 	sockets_parse_sockets(env);
837 
838 	return (0);
839 }
840 
841 struct server *
842 conf_new_server(const char *name)
843 {
844 	struct server *srv = NULL;
845 
846 	srv = calloc(1, sizeof(*srv));
847 	if (srv == NULL)
848 		fatalx("%s: calloc", __func__);
849 
850 	n = strlcpy(srv->name, name, sizeof(srv->name));
851 	if (n >= sizeof(srv->name))
852 		fatalx("%s: strlcpy", __func__);
853 	n = snprintf(srv->unix_socket_name,
854 	    sizeof(srv->unix_socket_name), "%s%s", D_HTTPD_CHROOT,
855 	    D_UNIX_SOCKET);
856 	if (n < 0 || (size_t)n >= sizeof(srv->unix_socket_name))
857 		fatalx("%s: snprintf", __func__);
858 	n = strlcpy(srv->repos_path, D_GOTPATH,
859 	    sizeof(srv->repos_path));
860 	if (n >= sizeof(srv->repos_path))
861 		fatalx("%s: strlcpy", __func__);
862 	n = strlcpy(srv->site_name, D_SITENAME,
863 	    sizeof(srv->site_name));
864 	if (n >= sizeof(srv->site_name))
865 		fatalx("%s: strlcpy", __func__);
866 	n = strlcpy(srv->site_owner, D_SITEOWNER,
867 	    sizeof(srv->site_owner));
868 	if (n >= sizeof(srv->site_owner))
869 		fatalx("%s: strlcpy", __func__);
870 	n = strlcpy(srv->site_link, D_SITELINK,
871 	    sizeof(srv->site_link));
872 	if (n >= sizeof(srv->site_link))
873 		fatalx("%s: strlcpy", __func__);
874 	n = strlcpy(srv->logo, D_GOTLOGO,
875 	    sizeof(srv->logo));
876 	if (n >= sizeof(srv->logo))
877 		fatalx("%s: strlcpy", __func__);
878 	n = strlcpy(srv->logo_url, D_GOTURL, sizeof(srv->logo_url));
879 	if (n >= sizeof(srv->logo_url))
880 		fatalx("%s: strlcpy", __func__);
881 	n = strlcpy(srv->custom_css, D_GOTWEBCSS, sizeof(srv->custom_css));
882 	if (n >= sizeof(srv->custom_css))
883 		fatalx("%s: strlcpy", __func__);
884 
885 	srv->show_site_owner = D_SHOWSOWNER;
886 	srv->show_repo_owner = D_SHOWROWNER;
887 	srv->show_repo_age = D_SHOWAGE;
888 	srv->show_repo_description = D_SHOWDESC;
889 	srv->show_repo_cloneurl = D_SHOWURL;
890 	srv->respect_exportok = D_RESPECTEXPORTOK;
891 
892 	srv->max_repos_display = D_MAXREPODISP;
893 	srv->max_commits_display = D_MAXCOMMITDISP;
894 	srv->max_repos = D_MAXREPO;
895 
896 	srv->unix_socket = 1;
897 	srv->fcgi_socket = 0;
898 
899 	TAILQ_INIT(&srv->al);
900 	TAILQ_INSERT_TAIL(&gotwebd->servers, srv, entry);
901 	gotwebd->server_cnt++;
902 
903 	return srv;
904 };
905 
906 int
907 symset(const char *nam, const char *val, int persist)
908 {
909 	struct sym *sym;
910 
911 	TAILQ_FOREACH(sym, &symhead, entry) {
912 		if (strcmp(nam, sym->nam) == 0)
913 			break;
914 	}
915 
916 	if (sym != NULL) {
917 		if (sym->persist == 1)
918 			return (0);
919 		else {
920 			free(sym->nam);
921 			free(sym->val);
922 			TAILQ_REMOVE(&symhead, sym, entry);
923 			free(sym);
924 		}
925 	}
926 	sym = calloc(1, sizeof(*sym));
927 	if (sym == NULL)
928 		return (-1);
929 
930 	sym->nam = strdup(nam);
931 	if (sym->nam == NULL) {
932 		free(sym);
933 		return (-1);
934 	}
935 	sym->val = strdup(val);
936 	if (sym->val == NULL) {
937 		free(sym->nam);
938 		free(sym);
939 		return (-1);
940 	}
941 	sym->used = 0;
942 	sym->persist = persist;
943 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
944 	return (0);
945 }
946 
947 int
948 cmdline_symset(char *s)
949 {
950 	char *sym, *val;
951 	int ret;
952 
953 	val = strrchr(s, '=');
954 	if (val == NULL)
955 		return (-1);
956 
957 	sym = strndup(s, val - s);
958 	if (sym == NULL)
959 		fatal("%s: strndup", __func__);
960 
961 	ret = symset(sym, val + 1, 1);
962 	free(sym);
963 
964 	return (ret);
965 }
966 
967 char *
968 symget(const char *nam)
969 {
970 	struct sym *sym;
971 
972 	TAILQ_FOREACH(sym, &symhead, entry) {
973 		if (strcmp(nam, sym->nam) == 0) {
974 			sym->used = 1;
975 			return (sym->val);
976 		}
977 	}
978 	return (NULL);
979 }
980 
981 int
982 getservice(const char *n)
983 {
984 	struct servent *s;
985 	const char *errstr;
986 	long long llval;
987 
988 	llval = strtonum(n, 0, UINT16_MAX, &errstr);
989 	if (errstr) {
990 		s = getservbyname(n, "tcp");
991 		if (s == NULL)
992 			s = getservbyname(n, "udp");
993 		if (s == NULL)
994 			return (-1);
995 		return ntohs(s->s_port);
996 	}
997 
998 	return (unsigned short)llval;
999 }
1000 
1001 int
1002 host(const char *s, struct server *new_srv, int max,
1003     in_port_t port, const char *ifname, int ipproto)
1004 {
1005 	struct addrinfo hints, *res0, *res;
1006 	int error, cnt = 0;
1007 	struct sockaddr_in *sain;
1008 	struct sockaddr_in6 *sin6;
1009 	struct address *h;
1010 
1011 	if ((cnt = host_if(s, new_srv, max, port, ifname, ipproto)) != 0)
1012 		return (cnt);
1013 
1014 	memset(&hints, 0, sizeof(hints));
1015 	hints.ai_family = AF_UNSPEC;
1016 	hints.ai_socktype = SOCK_STREAM; /* DUMMY */
1017 	hints.ai_flags = AI_ADDRCONFIG;
1018 	error = getaddrinfo(s, NULL, &hints, &res0);
1019 	if (error == EAI_AGAIN || error == EAI_NODATA || error == EAI_NONAME)
1020 		return (0);
1021 	if (error) {
1022 		log_warnx("%s: could not parse \"%s\": %s", __func__, s,
1023 		    gai_strerror(error));
1024 		return (-1);
1025 	}
1026 
1027 	for (res = res0; res && cnt < max; res = res->ai_next) {
1028 		if (res->ai_family != AF_INET &&
1029 		    res->ai_family != AF_INET6)
1030 			continue;
1031 		if ((h = calloc(1, sizeof(*h))) == NULL)
1032 			fatal(__func__);
1033 
1034 		if (port)
1035 			h->port = port;
1036 		if (ifname != NULL) {
1037 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1038 			    sizeof(h->ifname)) {
1039 				log_warnx("%s: interface name truncated",
1040 				    __func__);
1041 				freeaddrinfo(res0);
1042 				free(h);
1043 				return (-1);
1044 			}
1045 		}
1046 		if (ipproto != -1)
1047 			h->ipproto = ipproto;
1048 		h->ss.ss_family = res->ai_family;
1049 
1050 		if (res->ai_family == AF_INET) {
1051 			struct sockaddr_in *ra;
1052 			sain = (struct sockaddr_in *)&h->ss;
1053 			ra = (struct sockaddr_in *)res->ai_addr;
1054 			got_sockaddr_inet_init(sain, &ra->sin_addr);
1055 		} else {
1056 			struct sockaddr_in6 *ra;
1057 			sin6 = (struct sockaddr_in6 *)&h->ss;
1058 			ra = (struct sockaddr_in6 *)res->ai_addr;
1059 			got_sockaddr_inet6_init(sin6, &ra->sin6_addr, 0);
1060 		}
1061 
1062 		if (add_addr(new_srv, h))
1063 			return -1;
1064 		cnt++;
1065 	}
1066 	if (cnt == max && res) {
1067 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1068 		    s, max);
1069 	}
1070 	freeaddrinfo(res0);
1071 	return (cnt);
1072 }
1073 
1074 int
1075 host_if(const char *s, struct server *new_srv, int max,
1076     in_port_t port, const char *ifname, int ipproto)
1077 {
1078 	struct ifaddrs *ifap, *p;
1079 	struct sockaddr_in *sain;
1080 	struct sockaddr_in6 *sin6;
1081 	struct address *h;
1082 	int cnt = 0, af;
1083 
1084 	if (getifaddrs(&ifap) == -1)
1085 		fatal("getifaddrs");
1086 
1087 	/* First search for IPv4 addresses */
1088 	af = AF_INET;
1089 
1090  nextaf:
1091 	for (p = ifap; p != NULL && cnt < max; p = p->ifa_next) {
1092 		if (p->ifa_addr == NULL ||
1093 		    p->ifa_addr->sa_family != af ||
1094 		    (strcmp(s, p->ifa_name) != 0 &&
1095 		    !is_if_in_group(p->ifa_name, s)))
1096 			continue;
1097 		if ((h = calloc(1, sizeof(*h))) == NULL)
1098 			fatal("calloc");
1099 
1100 		if (port)
1101 			h->port = port;
1102 		if (ifname != NULL) {
1103 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1104 			    sizeof(h->ifname)) {
1105 				log_warnx("%s: interface name truncated",
1106 				    __func__);
1107 				free(h);
1108 				freeifaddrs(ifap);
1109 				return (-1);
1110 			}
1111 		}
1112 		if (ipproto != -1)
1113 			h->ipproto = ipproto;
1114 		h->ss.ss_family = af;
1115 
1116 		if (af == AF_INET) {
1117 			struct sockaddr_in *ra;
1118 			sain = (struct sockaddr_in *)&h->ss;
1119 			ra = (struct sockaddr_in *)p->ifa_addr;
1120 			got_sockaddr_inet_init(sain, &ra->sin_addr);
1121 		} else {
1122 			struct sockaddr_in6 *ra;
1123 			sin6 = (struct sockaddr_in6 *)&h->ss;
1124 			ra = (struct sockaddr_in6 *)p->ifa_addr;
1125 			got_sockaddr_inet6_init(sin6, &ra->sin6_addr,
1126 			    ra->sin6_scope_id);
1127 		}
1128 
1129 		if (add_addr(new_srv, h))
1130 			return -1;
1131 		cnt++;
1132 	}
1133 	if (af == AF_INET) {
1134 		/* Next search for IPv6 addresses */
1135 		af = AF_INET6;
1136 		goto nextaf;
1137 	}
1138 
1139 	if (cnt > max) {
1140 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1141 		    s, max);
1142 	}
1143 	freeifaddrs(ifap);
1144 	return (cnt);
1145 }
1146 
1147 int
1148 is_if_in_group(const char *ifname, const char *groupname)
1149 {
1150 /* TA: Check this... */
1151 #ifdef HAVE_STRUCT_IFGROUPREQ
1152 	unsigned int len;
1153 	struct ifgroupreq ifgr;
1154 	struct ifg_req *ifg;
1155 	int s;
1156 	int ret = 0;
1157 
1158 	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
1159 		err(1, "socket");
1160 
1161 	memset(&ifgr, 0, sizeof(ifgr));
1162 	if (strlcpy(ifgr.ifgr_name, ifname, IFNAMSIZ) >= IFNAMSIZ)
1163 		err(1, "IFNAMSIZ");
1164 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1) {
1165 		if (errno == EINVAL || errno == ENOTTY)
1166 			goto end;
1167 		err(1, "SIOCGIFGROUP");
1168 	}
1169 
1170 	len = ifgr.ifgr_len;
1171 	ifgr.ifgr_groups = calloc(len / sizeof(struct ifg_req),
1172 	    sizeof(struct ifg_req));
1173 	if (ifgr.ifgr_groups == NULL)
1174 		err(1, "getifgroups");
1175 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1)
1176 		err(1, "SIOCGIFGROUP");
1177 
1178 	ifg = ifgr.ifgr_groups;
1179 	for (; ifg && len >= sizeof(struct ifg_req); ifg++) {
1180 		len -= sizeof(struct ifg_req);
1181 		if (strcmp(ifg->ifgrq_group, groupname) == 0) {
1182 			ret = 1;
1183 			break;
1184 		}
1185 	}
1186 	free(ifgr.ifgr_groups);
1187 
1188 end:
1189 	close(s);
1190 	return (ret);
1191 #else
1192 	return (0);
1193 #endif
1194 }
1195 
1196 int
1197 get_addrs(const char *addr, struct server *new_srv, in_port_t port)
1198 {
1199 	if (strcmp("", addr) == 0) {
1200 		if (host("127.0.0.1", new_srv, 1, port, "127.0.0.1",
1201 		    -1) <= 0) {
1202 			yyerror("invalid listen ip: %s",
1203 			    "127.0.0.1");
1204 			return (-1);
1205 		}
1206 		if (host("::1", new_srv, 1, port, "::1", -1) <= 0) {
1207 			yyerror("invalid listen ip: %s", "::1");
1208 			return (-1);
1209 		}
1210 	} else {
1211 		if (host(addr, new_srv, GOTWEBD_MAXIFACE, port, addr,
1212 		    -1) <= 0) {
1213 			yyerror("invalid listen ip: %s", addr);
1214 			return (-1);
1215 		}
1216 	}
1217 	return (0);
1218 }
1219 
1220 int
1221 addr_dup_check(struct addresslist *al, struct address *h, const char *new_srv,
1222     const char *other_srv)
1223 {
1224 	struct address *a;
1225 	void *ia;
1226 	char buf[INET6_ADDRSTRLEN];
1227 	const char *addrstr;
1228 
1229 	TAILQ_FOREACH(a, al, entry) {
1230 		if (memcmp(&a->ss, &h->ss, sizeof(h->ss)) != 0 ||
1231 		    a->port != h->port)
1232 			continue;
1233 
1234 		switch (h->ss.ss_family) {
1235 		case AF_INET:
1236 			ia = &((struct sockaddr_in *)(&h->ss))->sin_addr;
1237 			break;
1238 		case AF_INET6:
1239 			ia = &((struct sockaddr_in6 *)(&h->ss))->sin6_addr;
1240 			break;
1241 		default:
1242 			yyerror("unknown address family: %d", h->ss.ss_family);
1243 			return -1;
1244 		}
1245 		addrstr = inet_ntop(h->ss.ss_family, ia, buf, sizeof(buf));
1246 		if (addrstr) {
1247 			if (other_srv) {
1248 				yyerror("server %s: duplicate fcgi listen "
1249 				    "address %s:%d, already used by server %s",
1250 				    new_srv, addrstr, h->port, other_srv);
1251 			} else {
1252 				log_warnx("server: %s: duplicate fcgi listen "
1253 				    "address %s:%d", new_srv, addrstr, h->port);
1254 			}
1255 		} else {
1256 			if (other_srv) {
1257 				yyerror("server: %s: duplicate fcgi listen "
1258 				    "address, already used by server %s",
1259 				    new_srv, other_srv);
1260 			} else {
1261 				log_warnx("server %s: duplicate fcgi listen "
1262 				    "address", new_srv);
1263 			}
1264 		}
1265 
1266 		return -1;
1267 	}
1268 
1269 	return 0;
1270 }
1271 
1272 int
1273 add_addr(struct server *new_srv, struct address *h)
1274 {
1275 	struct server *srv;
1276 
1277 	/* Address cannot be shared between different servers. */
1278 	TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
1279 		if (srv == new_srv)
1280 			continue;
1281 		if (addr_dup_check(&srv->al, h, new_srv->name, srv->name))
1282 			return -1;
1283 	}
1284 
1285 	/* Tolerate duplicate address lines within the scope of a server. */
1286 	if (addr_dup_check(&new_srv->al, h, NULL, NULL) == 0)
1287 		TAILQ_INSERT_TAIL(&new_srv->al, h, entry);
1288 	else
1289 		free(h);
1290 
1291 	return 0;
1292 }