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