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 "proc.h"
52 #include "gotwebd.h"
53 #include "got_sockaddr.h"
54 
55 TAILQ_HEAD(files, file)		 files = TAILQ_HEAD_INITIALIZER(files);
56 static struct file {
57 	TAILQ_ENTRY(file)	 entry;
58 	FILE			*stream;
59 	char			*name;
60 	int			 lineno;
61 	int			 errors;
62 } *file;
63 struct file	*newfile(const char *, int);
64 static void	 closefile(struct file *);
65 int		 check_file_secrecy(int, const char *);
66 int		 yyparse(void);
67 int		 yylex(void);
68 int		 yyerror(const char *, ...)
69     __attribute__((__format__ (printf, 1, 2)))
70     __attribute__((__nonnull__ (1)));
71 int		 kw_cmp(const void *, const void *);
72 int		 lookup(char *);
73 int		 lgetc(int);
74 int		 lungetc(int);
75 int		 findeol(void);
76 
77 TAILQ_HEAD(symhead, sym)	 symhead = TAILQ_HEAD_INITIALIZER(symhead);
78 struct sym {
79 	TAILQ_ENTRY(sym)	 entry;
80 	int			 used;
81 	int			 persist;
82 	char			*nam;
83 	char			*val;
84 };
85 
86 int	 symset(const char *, const char *, int);
87 char	*symget(const char *);
88 
89 static int		 errors;
90 
91 static struct gotwebd		*gotwebd;
92 static struct server		*new_srv;
93 static struct server		*conf_new_server(const char *);
94 int				 getservice(const char *);
95 int				 n;
96 
97 int		 get_addrs(const char *, struct server *, in_port_t);
98 int		 addr_dup_check(struct addresslist *, struct address *,
99 		    const char *, const char *);
100 int		 add_addr(struct server *, struct address *);
101 struct address	*host_v4(const char *);
102 struct address	*host_v6(const char *);
103 int		 host_dns(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		 host(const char *, struct server *,
108 		    int, in_port_t, const char *, int);
109 int		 is_if_in_group(const char *, const char *);
110 
111 typedef struct {
112 	union {
113 		long long	 number;
114 		char		*string;
115 		in_port_t	 port;
116 	} v;
117 	int lineno;
118 } YYSTYPE;
119 
120 %}
121 
122 %token	LISTEN WWW_PATH MAX_REPOS SITE_NAME SITE_OWNER SITE_LINK LOGO
123 %token	LOGO_URL SHOW_REPO_OWNER SHOW_REPO_AGE SHOW_REPO_DESCRIPTION
124 %token	MAX_REPOS_DISPLAY REPOS_PATH MAX_COMMITS_DISPLAY ON ERROR
125 %token	SHOW_SITE_OWNER SHOW_REPO_CLONEURL PORT PREFORK RESPECT_EXPORTOK
126 %token	UNIX_SOCKET UNIX_SOCKET_NAME SERVER CHROOT CUSTOM_CSS SOCKET
127 
128 %token	<v.string>	STRING
129 %type	<v.port>	fcgiport
130 %token	<v.number>	NUMBER
131 %type	<v.number>	boolean
132 
133 %%
134 
135 grammar		: /* empty */
136 		| grammar '\n'
137 		| grammar varset '\n'
138 		| grammar main '\n'
139 		| grammar server '\n'
140 		| grammar error '\n'		{ file->errors++; }
141 		;
142 
143 varset		: STRING '=' STRING	{
144 			char *s = $1;
145 			while (*s++) {
146 				if (isspace((unsigned char)*s)) {
147 					yyerror("macro name cannot contain "
148 					    "whitespace");
149 					free($1);
150 					free($3);
151 					YYERROR;
152 				}
153 			}
154 			if (symset($1, $3, 0) == -1)
155 				fatal("cannot store variable");
156 			free($1);
157 			free($3);
158 		}
159 		;
160 
161 boolean		: STRING {
162 			if (strcasecmp($1, "1") == 0 ||
163 			    strcasecmp($1, "yes") == 0 ||
164 			    strcasecmp($1, "on") == 0)
165 				$$ = 1;
166 			else if (strcasecmp($1, "0") == 0 ||
167 			    strcasecmp($1, "off") == 0 ||
168 			    strcasecmp($1, "no") == 0)
169 				$$ = 0;
170 			else {
171 				yyerror("invalid boolean value '%s'", $1);
172 				free($1);
173 				YYERROR;
174 			}
175 			free($1);
176 		}
177 		| ON { $$ = 1; }
178 		| NUMBER { $$ = $1; }
179 		;
180 
181 fcgiport	: PORT NUMBER {
182 			if ($2 <= 0 || $2 > (int)USHRT_MAX) {
183 				yyerror("invalid port: %lld", $2);
184 				YYERROR;
185 			}
186 			$$ = $2;
187 		}
188 		| PORT STRING {
189 			int	 val;
190 
191 			if ((val = getservice($2)) == -1) {
192 				yyerror("invalid port: %s", $2);
193 				free($2);
194 				YYERROR;
195 			}
196 			free($2);
197 
198 			$$ = val;
199 		}
200 		;
201 
202 main		: PREFORK NUMBER {
203 			gotwebd->prefork_gotwebd = $2;
204 		}
205 		| CHROOT STRING {
206 			n = strlcpy(gotwebd->httpd_chroot, $2,
207 			    sizeof(gotwebd->httpd_chroot));
208 			if (n >= sizeof(gotwebd->httpd_chroot)) {
209 				yyerror("%s: httpd_chroot truncated", __func__);
210 				free($2);
211 				YYERROR;
212 			}
213 			free($2);
214 		}
215 		| UNIX_SOCKET boolean {
216 			gotwebd->unix_socket = $2;
217 		}
218 		| UNIX_SOCKET_NAME STRING {
219 			n = snprintf(gotwebd->unix_socket_name,
220 			    sizeof(gotwebd->unix_socket_name), "%s%s",
221 			    strlen(gotwebd->httpd_chroot) ?
222 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $2);
223 			if (n < 0 ||
224 			    (size_t)n >= sizeof(gotwebd->unix_socket_name)) {
225 				yyerror("%s: unix_socket_name truncated",
226 				    __func__);
227 				free($2);
228 				YYERROR;
229 			}
230 			free($2);
231 		}
232 		;
233 
234 server		: SERVER STRING {
235 			struct server *srv;
236 
237 			TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
238 				if (strcmp(srv->name, $2) == 0) {
239 					yyerror("server name exists '%s'", $2);
240 					free($2);
241 					YYERROR;
242 				}
243 			}
244 
245 			new_srv = conf_new_server($2);
246 			log_debug("adding server %s", $2);
247 			free($2);
248 		}
249 		| SERVER STRING {
250 			struct server *srv;
251 
252 			TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
253 				if (strcmp(srv->name, $2) == 0) {
254 					yyerror("server name exists '%s'", $2);
255 					free($2);
256 					YYERROR;
257 				}
258 			}
259 
260 			new_srv = conf_new_server($2);
261 			log_debug("adding server %s", $2);
262 			free($2);
263 		} '{' optnl serveropts2 '}' {
264 		}
265 		;
266 
267 serveropts1	: REPOS_PATH STRING {
268 			n = strlcpy(new_srv->repos_path, $2,
269 			    sizeof(new_srv->repos_path));
270 			if (n >= sizeof(new_srv->repos_path)) {
271 				yyerror("%s: repos_path truncated", __func__);
272 				free($2);
273 				YYERROR;
274 			}
275 			free($2);
276 		}
277 		| SITE_NAME STRING {
278 			n = strlcpy(new_srv->site_name, $2,
279 			    sizeof(new_srv->site_name));
280 			if (n >= sizeof(new_srv->site_name)) {
281 				yyerror("%s: site_name truncated", __func__);
282 				free($2);
283 				YYERROR;
284 			}
285 			free($2);
286 		}
287 		| SITE_OWNER STRING {
288 			n = strlcpy(new_srv->site_owner, $2,
289 			    sizeof(new_srv->site_owner));
290 			if (n >= sizeof(new_srv->site_owner)) {
291 				yyerror("%s: site_owner truncated", __func__);
292 				free($2);
293 				YYERROR;
294 			}
295 			free($2);
296 		}
297 		| SITE_LINK STRING {
298 			n = strlcpy(new_srv->site_link, $2,
299 			    sizeof(new_srv->site_link));
300 			if (n >= sizeof(new_srv->site_link)) {
301 				yyerror("%s: site_link truncated", __func__);
302 				free($2);
303 				YYERROR;
304 			}
305 			free($2);
306 		}
307 		| LOGO STRING {
308 			n = strlcpy(new_srv->logo, $2, sizeof(new_srv->logo));
309 			if (n >= sizeof(new_srv->logo)) {
310 				yyerror("%s: logo truncated", __func__);
311 				free($2);
312 				YYERROR;
313 			}
314 			free($2);
315 		}
316 		| LOGO_URL STRING {
317 			n = strlcpy(new_srv->logo_url, $2,
318 			    sizeof(new_srv->logo_url));
319 			if (n >= sizeof(new_srv->logo_url)) {
320 				yyerror("%s: logo_url truncated", __func__);
321 				free($2);
322 				YYERROR;
323 			}
324 			free($2);
325 		}
326 		| CUSTOM_CSS STRING {
327 			n = strlcpy(new_srv->custom_css, $2,
328 			    sizeof(new_srv->custom_css));
329 			if (n >= sizeof(new_srv->custom_css)) {
330 				yyerror("%s: custom_css truncated", __func__);
331 				free($2);
332 				YYERROR;
333 			}
334 			free($2);
335 		}
336 		| LISTEN ON STRING fcgiport {
337 			if (get_addrs($3, new_srv, $4) == -1) {
338 				yyerror("could not get addrs");
339 				YYERROR;
340 			}
341 			new_srv->fcgi_socket = 1;
342 		}
343 		| LISTEN ON SOCKET STRING {
344 			if (!strcasecmp($4, "off") ||
345 			    !strcasecmp($4, "no")) {
346 				new_srv->unix_socket = 0;
347 				free($4);
348 				YYACCEPT;
349 			}
350 
351 			new_srv->unix_socket = 1;
352 
353 			n = snprintf(new_srv->unix_socket_name,
354 			    sizeof(new_srv->unix_socket_name), "%s%s",
355 			    strlen(gotwebd->httpd_chroot) ?
356 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $4);
357 			if (n < 0 ||
358 			    (size_t)n >= sizeof(new_srv->unix_socket_name)) {
359 				yyerror("%s: unix_socket_name truncated",
360 				    __func__);
361 				free($4);
362 				YYERROR;
363 			}
364 			free($4);
365 		}
366 		| MAX_REPOS NUMBER {
367 			if ($2 > 0)
368 				new_srv->max_repos = $2;
369 		}
370 		| SHOW_SITE_OWNER boolean {
371 			new_srv->show_site_owner = $2;
372 		}
373 		| SHOW_REPO_OWNER boolean {
374 			new_srv->show_repo_owner = $2;
375 		}
376 		| SHOW_REPO_AGE boolean {
377 			new_srv->show_repo_age = $2;
378 		}
379 		| SHOW_REPO_DESCRIPTION boolean {
380 			new_srv->show_repo_description = $2;
381 		}
382 		| SHOW_REPO_CLONEURL boolean {
383 			new_srv->show_repo_cloneurl = $2;
384 		}
385 		| RESPECT_EXPORTOK boolean {
386 			new_srv->respect_exportok = $2;
387 		}
388 		| MAX_REPOS_DISPLAY NUMBER {
389 				new_srv->max_repos_display = $2;
390 		}
391 		| MAX_COMMITS_DISPLAY NUMBER {
392 			if ($2 > 0)
393 				new_srv->max_commits_display = $2;
394 		}
395 		;
396 
397 serveropts2	: serveropts2 serveropts1 nl
398 		| serveropts1 optnl
399 		;
400 
401 nl		: '\n' optnl
402 		;
403 
404 optnl		: '\n' optnl		/* zero or more newlines */
405 		| /* empty */
406 		;
407 
408 %%
409 
410 struct keywords {
411 	const char	*k_name;
412 	int		 k_val;
413 };
414 
415 int
416 yyerror(const char *fmt, ...)
417 {
418 	va_list ap;
419 	char *msg;
420 
421 	file->errors++;
422 	va_start(ap, fmt);
423 	if (vasprintf(&msg, fmt, ap) == -1)
424 		fatalx("yyerror vasprintf");
425 	va_end(ap);
426 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
427 	free(msg);
428 	return (0);
429 }
430 
431 int
432 kw_cmp(const void *k, const void *e)
433 {
434 	return (strcmp(k, ((const struct keywords *)e)->k_name));
435 }
436 
437 int
438 lookup(char *s)
439 {
440 	/* This has to be sorted always. */
441 	static const struct keywords keywords[] = {
442 		{ "chroot",			CHROOT },
443 		{ "custom_css",			CUSTOM_CSS },
444 		{ "listen",			LISTEN },
445 		{ "logo",			LOGO },
446 		{ "logo_url",			LOGO_URL },
447 		{ "max_commits_display",	MAX_COMMITS_DISPLAY },
448 		{ "max_repos",			MAX_REPOS },
449 		{ "max_repos_display",		MAX_REPOS_DISPLAY },
450 		{ "on",				ON },
451 		{ "port",			PORT },
452 		{ "prefork",			PREFORK },
453 		{ "repos_path",			REPOS_PATH },
454 		{ "respect_exportok",		RESPECT_EXPORTOK },
455 		{ "server",			SERVER },
456 		{ "show_repo_age",		SHOW_REPO_AGE },
457 		{ "show_repo_cloneurl",		SHOW_REPO_CLONEURL },
458 		{ "show_repo_description",	SHOW_REPO_DESCRIPTION },
459 		{ "show_repo_owner",		SHOW_REPO_OWNER },
460 		{ "show_site_owner",		SHOW_SITE_OWNER },
461 		{ "site_link",			SITE_LINK },
462 		{ "site_name",			SITE_NAME },
463 		{ "site_owner",			SITE_OWNER },
464 		{ "socket",			SOCKET },
465 		{ "unix_socket",		UNIX_SOCKET },
466 		{ "unix_socket_name",		UNIX_SOCKET_NAME },
467 	};
468 	const struct keywords *p;
469 
470 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
471 	    sizeof(keywords[0]), kw_cmp);
472 
473 	if (p)
474 		return (p->k_val);
475 	else
476 		return (STRING);
477 }
478 
479 #define MAXPUSHBACK	128
480 
481 unsigned char *parsebuf;
482 int parseindex;
483 unsigned char pushback_buffer[MAXPUSHBACK];
484 int pushback_index = 0;
485 
486 int
487 lgetc(int quotec)
488 {
489 	int c, next;
490 
491 	if (parsebuf) {
492 		/* Read character from the parsebuffer instead of input. */
493 		if (parseindex >= 0) {
494 			c = parsebuf[parseindex++];
495 			if (c != '\0')
496 				return (c);
497 			parsebuf = NULL;
498 		} else
499 			parseindex++;
500 	}
501 
502 	if (pushback_index)
503 		return (pushback_buffer[--pushback_index]);
504 
505 	if (quotec) {
506 		c = getc(file->stream);
507 		if (c == EOF)
508 			yyerror("reached end of file while parsing "
509 			    "quoted string");
510 		return (c);
511 	}
512 
513 	c = getc(file->stream);
514 	while (c == '\\') {
515 		next = getc(file->stream);
516 		if (next != '\n') {
517 			c = next;
518 			break;
519 		}
520 		yylval.lineno = file->lineno;
521 		file->lineno++;
522 		c = getc(file->stream);
523 	}
524 
525 	return (c);
526 }
527 
528 int
529 lungetc(int c)
530 {
531 	if (c == EOF)
532 		return (EOF);
533 	if (parsebuf) {
534 		parseindex--;
535 		if (parseindex >= 0)
536 			return (c);
537 	}
538 	if (pushback_index < MAXPUSHBACK-1)
539 		return (pushback_buffer[pushback_index++] = c);
540 	else
541 		return (EOF);
542 }
543 
544 int
545 findeol(void)
546 {
547 	int c;
548 
549 	parsebuf = NULL;
550 
551 	/* Skip to either EOF or the first real EOL. */
552 	while (1) {
553 		if (pushback_index)
554 			c = pushback_buffer[--pushback_index];
555 		else
556 			c = lgetc(0);
557 		if (c == '\n') {
558 			file->lineno++;
559 			break;
560 		}
561 		if (c == EOF)
562 			break;
563 	}
564 	return (ERROR);
565 }
566 
567 int
568 yylex(void)
569 {
570 	unsigned char buf[8096];
571 	unsigned char *p, *val;
572 	int quotec, next, c;
573 	int token;
574 
575 top:
576 	p = buf;
577 	c = lgetc(0);
578 	while (c == ' ' || c == '\t')
579 		c = lgetc(0); /* nothing */
580 
581 	yylval.lineno = file->lineno;
582 	if (c == '#') {
583 		c = lgetc(0);
584 		while (c != '\n' && c != EOF)
585 			c = lgetc(0); /* nothing */
586 	}
587 	if (c == '$' && parsebuf == NULL) {
588 		while (1) {
589 			c = lgetc(0);
590 			if (c == EOF)
591 				return (0);
592 
593 			if (p + 1 >= buf + sizeof(buf) - 1) {
594 				yyerror("string too long");
595 				return (findeol());
596 			}
597 			if (isalnum(c) || c == '_') {
598 				*p++ = c;
599 				continue;
600 			}
601 			*p = '\0';
602 			lungetc(c);
603 			break;
604 		}
605 		val = symget(buf);
606 		if (val == NULL) {
607 			yyerror("macro '%s' not defined", buf);
608 			return (findeol());
609 		}
610 		parsebuf = val;
611 		parseindex = 0;
612 		goto top;
613 	}
614 
615 	switch (c) {
616 	case '\'':
617 	case '"':
618 		quotec = c;
619 		while (1) {
620 			c = lgetc(quotec);
621 			if (c == EOF)
622 				return (0);
623 			if (c == '\n') {
624 				file->lineno++;
625 				continue;
626 			} else if (c == '\\') {
627 				next = lgetc(quotec);
628 				if (next == EOF)
629 					return (0);
630 				if (next == quotec || c == ' ' || c == '\t')
631 					c = next;
632 				else if (next == '\n') {
633 					file->lineno++;
634 					continue;
635 				} else
636 					lungetc(next);
637 			} else if (c == quotec) {
638 				*p = '\0';
639 				break;
640 			} else if (c == '\0') {
641 				yyerror("syntax error");
642 				return (findeol());
643 			}
644 			if (p + 1 >= buf + sizeof(buf) - 1) {
645 				yyerror("string too long");
646 				return (findeol());
647 			}
648 			*p++ = c;
649 		}
650 		yylval.v.string = strdup(buf);
651 		if (yylval.v.string == NULL)
652 			err(1, "yylex: strdup");
653 		return (STRING);
654 	}
655 
656 #define allowed_to_end_number(x) \
657 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
658 
659 	if (c == '-' || isdigit(c)) {
660 		do {
661 			*p++ = c;
662 			if ((unsigned)(p-buf) >= sizeof(buf)) {
663 				yyerror("string too long");
664 				return (findeol());
665 			}
666 			c = lgetc(0);
667 		} while (c != EOF && isdigit(c));
668 		lungetc(c);
669 		if (p == buf + 1 && buf[0] == '-')
670 			goto nodigits;
671 		if (c == EOF || allowed_to_end_number(c)) {
672 			const char *errstr = NULL;
673 
674 			*p = '\0';
675 			yylval.v.number = strtonum(buf, LLONG_MIN,
676 			    LLONG_MAX, &errstr);
677 			if (errstr) {
678 				yyerror("\"%s\" invalid number: %s",
679 				    buf, errstr);
680 				return (findeol());
681 			}
682 			return (NUMBER);
683 		} else {
684 nodigits:
685 			while (p > buf + 1)
686 				lungetc(*--p);
687 			c = *--p;
688 			if (c == '-')
689 				return (c);
690 		}
691 	}
692 
693 #define allowed_in_string(x) \
694 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
695 	x != '{' && x != '}' && \
696 	x != '!' && x != '=' && x != '#' && \
697 	x != ','))
698 
699 	if (isalnum(c) || c == ':' || c == '_') {
700 		do {
701 			*p++ = c;
702 			if ((unsigned)(p-buf) >= sizeof(buf)) {
703 				yyerror("string too long");
704 				return (findeol());
705 			}
706 			c = lgetc(0);
707 		} while (c != EOF && (allowed_in_string(c)));
708 		lungetc(c);
709 		*p = '\0';
710 		token = lookup(buf);
711 		if (token == STRING) {
712 			yylval.v.string = strdup(buf);
713 			if (yylval.v.string == NULL)
714 				err(1, "yylex: strdup");
715 		}
716 		return (token);
717 	}
718 	if (c == '\n') {
719 		yylval.lineno = file->lineno;
720 		file->lineno++;
721 	}
722 	if (c == EOF)
723 		return (0);
724 	return (c);
725 }
726 
727 int
728 check_file_secrecy(int fd, const char *fname)
729 {
730 	struct stat st;
731 
732 	if (fstat(fd, &st)) {
733 		log_warn("cannot stat %s", fname);
734 		return (-1);
735 	}
736 	if (st.st_uid != 0 && st.st_uid != getuid()) {
737 		log_warnx("%s: owner not root or current user", fname);
738 		return (-1);
739 	}
740 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
741 		log_warnx("%s: group writable or world read/writable", fname);
742 		return (-1);
743 	}
744 	return (0);
745 }
746 
747 struct file *
748 newfile(const char *name, int secret)
749 {
750 	struct file *nfile;
751 
752 	nfile = calloc(1, sizeof(struct file));
753 	if (nfile == NULL) {
754 		log_warn("calloc");
755 		return (NULL);
756 	}
757 	nfile->name = strdup(name);
758 	if (nfile->name == NULL) {
759 		log_warn("strdup");
760 		free(nfile);
761 		return (NULL);
762 	}
763 	nfile->stream = fopen(nfile->name, "r");
764 	if (nfile->stream == NULL) {
765 		/* no warning, we don't require a conf file */
766 		free(nfile->name);
767 		free(nfile);
768 		return (NULL);
769 	} else if (secret &&
770 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
771 		fclose(nfile->stream);
772 		free(nfile->name);
773 		free(nfile);
774 		return (NULL);
775 	}
776 	nfile->lineno = 1;
777 	return (nfile);
778 }
779 
780 static void
781 closefile(struct file *xfile)
782 {
783 	fclose(xfile->stream);
784 	free(xfile->name);
785 	free(xfile);
786 }
787 
788 static void
789 add_default_server(void)
790 {
791 	new_srv = conf_new_server(D_SITENAME);
792 	log_debug("%s: adding default server %s", __func__, D_SITENAME);
793 }
794 
795 int
796 parse_config(const char *filename, struct gotwebd *env)
797 {
798 	struct sym *sym, *next;
799 
800 	if (config_init(env) == -1)
801 		fatalx("failed to initialize configuration");
802 
803 	gotwebd = env;
804 
805 	file = newfile(filename, 0);
806 	if (file == NULL) {
807 		add_default_server();
808 		sockets_parse_sockets(env);
809 		/* just return, as we don't require a conf file */
810 		return (0);
811 	}
812 
813 	yyparse();
814 	errors = file->errors;
815 	closefile(file);
816 
817 	/* Free macros and check which have not been used. */
818 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
819 		if ((gotwebd->gotwebd_verbose > 1) && !sym->used)
820 			fprintf(stderr, "warning: macro '%s' not used\n",
821 			    sym->nam);
822 		if (!sym->persist) {
823 			free(sym->nam);
824 			free(sym->val);
825 			TAILQ_REMOVE(&symhead, sym, entry);
826 			free(sym);
827 		}
828 	}
829 
830 	if (errors)
831 		return (-1);
832 
833 	/* just add default server if no config specified */
834 	if (gotwebd->server_cnt == 0)
835 		add_default_server();
836 
837 	/* setup our listening sockets */
838 	sockets_parse_sockets(env);
839 
840 	return (0);
841 }
842 
843 struct server *
844 conf_new_server(const char *name)
845 {
846 	struct server *srv = NULL;
847 
848 	srv = calloc(1, sizeof(*srv));
849 	if (srv == NULL)
850 		fatalx("%s: calloc", __func__);
851 
852 	n = strlcpy(srv->name, name, sizeof(srv->name));
853 	if (n >= sizeof(srv->name))
854 		fatalx("%s: strlcpy", __func__);
855 	n = snprintf(srv->unix_socket_name,
856 	    sizeof(srv->unix_socket_name), "%s%s", D_HTTPD_CHROOT,
857 	    D_UNIX_SOCKET);
858 	if (n < 0 || (size_t)n >= sizeof(srv->unix_socket_name))
859 		fatalx("%s: snprintf", __func__);
860 	n = strlcpy(srv->repos_path, D_GOTPATH,
861 	    sizeof(srv->repos_path));
862 	if (n >= sizeof(srv->repos_path))
863 		fatalx("%s: strlcpy", __func__);
864 	n = strlcpy(srv->site_name, D_SITENAME,
865 	    sizeof(srv->site_name));
866 	if (n >= sizeof(srv->site_name))
867 		fatalx("%s: strlcpy", __func__);
868 	n = strlcpy(srv->site_owner, D_SITEOWNER,
869 	    sizeof(srv->site_owner));
870 	if (n >= sizeof(srv->site_owner))
871 		fatalx("%s: strlcpy", __func__);
872 	n = strlcpy(srv->site_link, D_SITELINK,
873 	    sizeof(srv->site_link));
874 	if (n >= sizeof(srv->site_link))
875 		fatalx("%s: strlcpy", __func__);
876 	n = strlcpy(srv->logo, D_GOTLOGO,
877 	    sizeof(srv->logo));
878 	if (n >= sizeof(srv->logo))
879 		fatalx("%s: strlcpy", __func__);
880 	n = strlcpy(srv->logo_url, D_GOTURL, sizeof(srv->logo_url));
881 	if (n >= sizeof(srv->logo_url))
882 		fatalx("%s: strlcpy", __func__);
883 	n = strlcpy(srv->custom_css, D_GOTWEBCSS, sizeof(srv->custom_css));
884 	if (n >= sizeof(srv->custom_css))
885 		fatalx("%s: strlcpy", __func__);
886 
887 	srv->show_site_owner = D_SHOWSOWNER;
888 	srv->show_repo_owner = D_SHOWROWNER;
889 	srv->show_repo_age = D_SHOWAGE;
890 	srv->show_repo_description = D_SHOWDESC;
891 	srv->show_repo_cloneurl = D_SHOWURL;
892 	srv->respect_exportok = D_RESPECTEXPORTOK;
893 
894 	srv->max_repos_display = D_MAXREPODISP;
895 	srv->max_commits_display = D_MAXCOMMITDISP;
896 	srv->max_repos = D_MAXREPO;
897 
898 	srv->unix_socket = 1;
899 	srv->fcgi_socket = 0;
900 
901 	TAILQ_INIT(&srv->al);
902 	TAILQ_INSERT_TAIL(&gotwebd->servers, srv, entry);
903 	gotwebd->server_cnt++;
904 
905 	return srv;
906 };
907 
908 int
909 symset(const char *nam, const char *val, int persist)
910 {
911 	struct sym *sym;
912 
913 	TAILQ_FOREACH(sym, &symhead, entry) {
914 		if (strcmp(nam, sym->nam) == 0)
915 			break;
916 	}
917 
918 	if (sym != NULL) {
919 		if (sym->persist == 1)
920 			return (0);
921 		else {
922 			free(sym->nam);
923 			free(sym->val);
924 			TAILQ_REMOVE(&symhead, sym, entry);
925 			free(sym);
926 		}
927 	}
928 	sym = calloc(1, sizeof(*sym));
929 	if (sym == NULL)
930 		return (-1);
931 
932 	sym->nam = strdup(nam);
933 	if (sym->nam == NULL) {
934 		free(sym);
935 		return (-1);
936 	}
937 	sym->val = strdup(val);
938 	if (sym->val == NULL) {
939 		free(sym->nam);
940 		free(sym);
941 		return (-1);
942 	}
943 	sym->used = 0;
944 	sym->persist = persist;
945 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
946 	return (0);
947 }
948 
949 int
950 cmdline_symset(char *s)
951 {
952 	char *sym, *val;
953 	int ret;
954 
955 	val = strrchr(s, '=');
956 	if (val == NULL)
957 		return (-1);
958 
959 	sym = strndup(s, val - s);
960 	if (sym == NULL)
961 		fatal("%s: strndup", __func__);
962 
963 	ret = symset(sym, val + 1, 1);
964 	free(sym);
965 
966 	return (ret);
967 }
968 
969 char *
970 symget(const char *nam)
971 {
972 	struct sym *sym;
973 
974 	TAILQ_FOREACH(sym, &symhead, entry) {
975 		if (strcmp(nam, sym->nam) == 0) {
976 			sym->used = 1;
977 			return (sym->val);
978 		}
979 	}
980 	return (NULL);
981 }
982 
983 int
984 getservice(const char *n)
985 {
986 	struct servent *s;
987 	const char *errstr;
988 	long long llval;
989 
990 	llval = strtonum(n, 0, UINT16_MAX, &errstr);
991 	if (errstr) {
992 		s = getservbyname(n, "tcp");
993 		if (s == NULL)
994 			s = getservbyname(n, "udp");
995 		if (s == NULL)
996 			return (-1);
997 		return ntohs(s->s_port);
998 	}
999 
1000 	return (unsigned short)llval;
1001 }
1002 
1003 struct address *
1004 host_v4(const char *s)
1005 {
1006 	struct in_addr ina;
1007 	struct sockaddr_in *sain;
1008 	struct address *h;
1009 
1010 	memset(&ina, 0, sizeof(ina));
1011 	if (inet_pton(AF_INET, s, &ina) != 1)
1012 		return (NULL);
1013 
1014 	if ((h = calloc(1, sizeof(*h))) == NULL)
1015 		fatal(__func__);
1016 	sain = (struct sockaddr_in *)&h->ss;
1017 	got_sockaddr_inet_init(sain, &ina);
1018 	if (sain->sin_addr.s_addr == INADDR_ANY)
1019 		h->prefixlen = 0; /* 0.0.0.0 address */
1020 	else
1021 		h->prefixlen = -1; /* host address */
1022 	return (h);
1023 }
1024 
1025 struct address *
1026 host_v6(const char *s)
1027 {
1028 	struct addrinfo hints, *res;
1029 	struct sockaddr_in6 *sa_in6, *ra;
1030 	struct address *h = NULL;
1031 
1032 	memset(&hints, 0, sizeof(hints));
1033 	hints.ai_family = AF_INET6;
1034 	hints.ai_socktype = SOCK_DGRAM; /* dummy */
1035 	hints.ai_flags = AI_NUMERICHOST;
1036 	if (getaddrinfo(s, "0", &hints, &res) == 0) {
1037 		if ((h = calloc(1, sizeof(*h))) == NULL)
1038 			fatal(__func__);
1039 		sa_in6 = (struct sockaddr_in6 *)&h->ss;
1040 		ra = (struct sockaddr_in6 *)res->ai_addr;
1041 		got_sockaddr_inet6_init(sa_in6, &ra->sin6_addr,
1042 		    ra->sin6_scope_id);
1043 		if (memcmp(&sa_in6->sin6_addr, &in6addr_any,
1044 		    sizeof(sa_in6->sin6_addr)) == 0)
1045 			h->prefixlen = 0; /* any address */
1046 		else
1047 			h->prefixlen = -1; /* host address */
1048 		freeaddrinfo(res);
1049 	}
1050 
1051 	return (h);
1052 }
1053 
1054 int
1055 host_dns(const char *s, struct server *new_srv, int max,
1056     in_port_t port, const char *ifname, int ipproto)
1057 {
1058 	struct addrinfo hints, *res0, *res;
1059 	int error, cnt = 0;
1060 	struct sockaddr_in *sain;
1061 	struct sockaddr_in6 *sin6;
1062 	struct address *h;
1063 
1064 	if ((cnt = host_if(s, new_srv, max, port, ifname, ipproto)) != 0)
1065 		return (cnt);
1066 
1067 	memset(&hints, 0, sizeof(hints));
1068 	hints.ai_family = PF_UNSPEC;
1069 	hints.ai_socktype = SOCK_DGRAM; /* DUMMY */
1070 	hints.ai_flags = AI_ADDRCONFIG;
1071 	error = getaddrinfo(s, NULL, &hints, &res0);
1072 	if (error == EAI_AGAIN || error == EAI_NODATA || error == EAI_NONAME)
1073 		return (0);
1074 	if (error) {
1075 		log_warnx("%s: could not parse \"%s\": %s", __func__, s,
1076 		    gai_strerror(error));
1077 		return (-1);
1078 	}
1079 
1080 	for (res = res0; res && cnt < max; res = res->ai_next) {
1081 		if (res->ai_family != AF_INET &&
1082 		    res->ai_family != AF_INET6)
1083 			continue;
1084 		if ((h = calloc(1, sizeof(*h))) == NULL)
1085 			fatal(__func__);
1086 
1087 		if (port)
1088 			h->port = port;
1089 		if (ifname != NULL) {
1090 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1091 			    sizeof(h->ifname)) {
1092 				log_warnx("%s: interface name truncated",
1093 				    __func__);
1094 				freeaddrinfo(res0);
1095 				free(h);
1096 				return (-1);
1097 			}
1098 		}
1099 		if (ipproto != -1)
1100 			h->ipproto = ipproto;
1101 		h->ss.ss_family = res->ai_family;
1102 		h->prefixlen = -1; /* host address */
1103 
1104 		if (res->ai_family == AF_INET) {
1105 			struct sockaddr_in *ra;
1106 			sain = (struct sockaddr_in *)&h->ss;
1107 			ra = (struct sockaddr_in *)res->ai_addr;
1108 			got_sockaddr_inet_init(sain, &ra->sin_addr);
1109 		} else {
1110 			struct sockaddr_in6 *ra;
1111 			sin6 = (struct sockaddr_in6 *)&h->ss;
1112 			ra = (struct sockaddr_in6 *)res->ai_addr;
1113 			got_sockaddr_inet6_init(sin6, &ra->sin6_addr, 0);
1114 		}
1115 
1116 		if (add_addr(new_srv, h))
1117 			return -1;
1118 		cnt++;
1119 	}
1120 	if (cnt == max && res) {
1121 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1122 		    s, max);
1123 	}
1124 	freeaddrinfo(res0);
1125 	return (cnt);
1126 }
1127 
1128 int
1129 host_if(const char *s, struct server *new_srv, int max,
1130     in_port_t port, const char *ifname, int ipproto)
1131 {
1132 	struct ifaddrs *ifap, *p;
1133 	struct sockaddr_in *sain;
1134 	struct sockaddr_in6 *sin6;
1135 	struct address *h;
1136 	int cnt = 0, af;
1137 
1138 	if (getifaddrs(&ifap) == -1)
1139 		fatal("getifaddrs");
1140 
1141 	/* First search for IPv4 addresses */
1142 	af = AF_INET;
1143 
1144  nextaf:
1145 	for (p = ifap; p != NULL && cnt < max; p = p->ifa_next) {
1146 		if (p->ifa_addr == NULL ||
1147 		    p->ifa_addr->sa_family != af ||
1148 		    (strcmp(s, p->ifa_name) != 0 &&
1149 		    !is_if_in_group(p->ifa_name, s)))
1150 			continue;
1151 		if ((h = calloc(1, sizeof(*h))) == NULL)
1152 			fatal("calloc");
1153 
1154 		if (port)
1155 			h->port = port;
1156 		if (ifname != NULL) {
1157 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1158 			    sizeof(h->ifname)) {
1159 				log_warnx("%s: interface name truncated",
1160 				    __func__);
1161 				free(h);
1162 				freeifaddrs(ifap);
1163 				return (-1);
1164 			}
1165 		}
1166 		if (ipproto != -1)
1167 			h->ipproto = ipproto;
1168 		h->ss.ss_family = af;
1169 		h->prefixlen = -1; /* host address */
1170 
1171 		if (af == AF_INET) {
1172 			struct sockaddr_in *ra;
1173 			sain = (struct sockaddr_in *)&h->ss;
1174 			ra = (struct sockaddr_in *)p->ifa_addr;
1175 			got_sockaddr_inet_init(sain, &ra->sin_addr);
1176 		} else {
1177 			struct sockaddr_in6 *ra;
1178 			sin6 = (struct sockaddr_in6 *)&h->ss;
1179 			ra = (struct sockaddr_in6 *)p->ifa_addr;
1180 			got_sockaddr_inet6_init(sin6, &ra->sin6_addr,
1181 			    ra->sin6_scope_id);
1182 		}
1183 
1184 		if (add_addr(new_srv, h))
1185 			return -1;
1186 		cnt++;
1187 	}
1188 	if (af == AF_INET) {
1189 		/* Next search for IPv6 addresses */
1190 		af = AF_INET6;
1191 		goto nextaf;
1192 	}
1193 
1194 	if (cnt > max) {
1195 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1196 		    s, max);
1197 	}
1198 	freeifaddrs(ifap);
1199 	return (cnt);
1200 }
1201 
1202 int
1203 host(const char *s, struct server *new_srv, int max,
1204     in_port_t port, const char *ifname, int ipproto)
1205 {
1206 	struct address *h;
1207 
1208 	h = host_v4(s);
1209 
1210 	/* IPv6 address? */
1211 	if (h == NULL)
1212 		h = host_v6(s);
1213 
1214 	if (h != NULL) {
1215 		if (port)
1216 			h->port = port;
1217 		if (ifname != NULL) {
1218 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1219 			    sizeof(h->ifname)) {
1220 				log_warnx("%s: interface name truncated",
1221 				    __func__);
1222 				free(h);
1223 				return (-1);
1224 			}
1225 		}
1226 		if (ipproto != -1)
1227 			h->ipproto = ipproto;
1228 
1229 		if (add_addr(new_srv, h))
1230 			return -1;
1231 		return (1);
1232 	}
1233 
1234 	return (host_dns(s, new_srv, max, port, ifname, ipproto));
1235 }
1236 
1237 int
1238 is_if_in_group(const char *ifname, const char *groupname)
1239 {
1240 /* TA: Check this... */
1241 #ifdef HAVE_STRUCT_IFGROUPREQ
1242 	unsigned int len;
1243 	struct ifgroupreq ifgr;
1244 	struct ifg_req *ifg;
1245 	int s;
1246 	int ret = 0;
1247 
1248 	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
1249 		err(1, "socket");
1250 
1251 	memset(&ifgr, 0, sizeof(ifgr));
1252 	if (strlcpy(ifgr.ifgr_name, ifname, IFNAMSIZ) >= IFNAMSIZ)
1253 		err(1, "IFNAMSIZ");
1254 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1) {
1255 		if (errno == EINVAL || errno == ENOTTY)
1256 			goto end;
1257 		err(1, "SIOCGIFGROUP");
1258 	}
1259 
1260 	len = ifgr.ifgr_len;
1261 	ifgr.ifgr_groups = calloc(len / sizeof(struct ifg_req),
1262 	    sizeof(struct ifg_req));
1263 	if (ifgr.ifgr_groups == NULL)
1264 		err(1, "getifgroups");
1265 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1)
1266 		err(1, "SIOCGIFGROUP");
1267 
1268 	ifg = ifgr.ifgr_groups;
1269 	for (; ifg && len >= sizeof(struct ifg_req); ifg++) {
1270 		len -= sizeof(struct ifg_req);
1271 		if (strcmp(ifg->ifgrq_group, groupname) == 0) {
1272 			ret = 1;
1273 			break;
1274 		}
1275 	}
1276 	free(ifgr.ifgr_groups);
1277 
1278 end:
1279 	close(s);
1280 	return (ret);
1281 #else
1282 	return (0);
1283 #endif
1284 }
1285 
1286 int
1287 get_addrs(const char *addr, struct server *new_srv, in_port_t port)
1288 {
1289 	if (strcmp("", addr) == 0) {
1290 		if (host("127.0.0.1", new_srv, 1, port, "127.0.0.1",
1291 		    -1) <= 0) {
1292 			yyerror("invalid listen ip: %s",
1293 			    "127.0.0.1");
1294 			return (-1);
1295 		}
1296 		if (host("::1", new_srv, 1, port, "::1", -1) <= 0) {
1297 			yyerror("invalid listen ip: %s", "::1");
1298 			return (-1);
1299 		}
1300 	} else {
1301 		if (host(addr, new_srv, GOTWEBD_MAXIFACE, port, addr,
1302 		    -1) <= 0) {
1303 			yyerror("invalid listen ip: %s", addr);
1304 			return (-1);
1305 		}
1306 	}
1307 	return (0);
1308 }
1309 
1310 int
1311 addr_dup_check(struct addresslist *al, struct address *h, const char *new_srv,
1312     const char *other_srv)
1313 {
1314 	struct address *a;
1315 	void *ia;
1316 	char buf[INET6_ADDRSTRLEN];
1317 	const char *addrstr;
1318 
1319 	TAILQ_FOREACH(a, al, entry) {
1320 		if (memcmp(&a->ss, &h->ss, sizeof(h->ss)) != 0 ||
1321 		    a->port != h->port)
1322 			continue;
1323 
1324 		switch (h->ss.ss_family) {
1325 		case AF_INET:
1326 			ia = &((struct sockaddr_in *)(&h->ss))->sin_addr;
1327 			break;
1328 		case AF_INET6:
1329 			ia = &((struct sockaddr_in6 *)(&h->ss))->sin6_addr;
1330 			break;
1331 		default:
1332 			yyerror("unknown address family: %d", h->ss.ss_family);
1333 			return -1;
1334 		}
1335 		addrstr = inet_ntop(h->ss.ss_family, ia, buf, sizeof(buf));
1336 		if (addrstr) {
1337 			if (other_srv) {
1338 				yyerror("server %s: duplicate fcgi listen "
1339 				    "address %s:%d, already used by server %s",
1340 				    new_srv, addrstr, h->port, other_srv);
1341 			} else {
1342 				log_warnx("server: %s: duplicate fcgi listen "
1343 				    "address %s:%d", new_srv, addrstr, h->port);
1344 			}
1345 		} else {
1346 			if (other_srv) {
1347 				yyerror("server: %s: duplicate fcgi listen "
1348 				    "address, already used by server %s",
1349 				    new_srv, other_srv);
1350 			} else {
1351 				log_warnx("server %s: duplicate fcgi listen "
1352 				    "address", new_srv);
1353 			}
1354 		}
1355 
1356 		return -1;
1357 	}
1358 
1359 	return 0;
1360 }
1361 
1362 int
1363 add_addr(struct server *new_srv, struct address *h)
1364 {
1365 	struct server *srv;
1366 
1367 	/* Address cannot be shared between different servers. */
1368 	TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
1369 		if (srv == new_srv)
1370 			continue;
1371 		if (addr_dup_check(&srv->al, h, new_srv->name, srv->name))
1372 			return -1;
1373 	}
1374 
1375 	/* Tolerate duplicate address lines within the scope of a server. */
1376 	if (addr_dup_check(&new_srv->al, h, NULL, NULL) == 0)
1377 		TAILQ_INSERT_TAIL(&new_srv->al, h, entry);
1378 	else
1379 		free(h);
1380 
1381 	return 0;
1382 }