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_reference.h"
52 
53 #include "gotwebd.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 *, const char *, struct server *);
98 int		 addr_dup_check(struct addresslist *, struct address *,
99 		    const char *, const char *);
100 int		 add_addr(struct server *, struct address *);
101 
102 typedef struct {
103 	union {
104 		long long	 number;
105 		char		*string;
106 	} v;
107 	int lineno;
108 } YYSTYPE;
109 
110 %}
111 
112 %token	LISTEN WWW_PATH MAX_REPOS SITE_NAME SITE_OWNER SITE_LINK LOGO
113 %token	LOGO_URL SHOW_REPO_OWNER SHOW_REPO_AGE SHOW_REPO_DESCRIPTION
114 %token	MAX_REPOS_DISPLAY REPOS_PATH MAX_COMMITS_DISPLAY ON ERROR
115 %token	SHOW_SITE_OWNER SHOW_REPO_CLONEURL PORT PREFORK RESPECT_EXPORTOK
116 %token	UNIX_SOCKET UNIX_SOCKET_NAME SERVER CHROOT CUSTOM_CSS SOCKET
117 
118 %token	<v.string>	STRING
119 %token	<v.number>	NUMBER
120 %type	<v.number>	boolean
121 %type	<v.string>	listen_addr
122 
123 %%
124 
125 grammar		: /* empty */
126 		| grammar '\n'
127 		| grammar varset '\n'
128 		| grammar main '\n'
129 		| grammar server '\n'
130 		| grammar error '\n'		{ file->errors++; }
131 		;
132 
133 varset		: STRING '=' STRING	{
134 			char *s = $1;
135 			while (*s++) {
136 				if (isspace((unsigned char)*s)) {
137 					yyerror("macro name cannot contain "
138 					    "whitespace");
139 					free($1);
140 					free($3);
141 					YYERROR;
142 				}
143 			}
144 			if (symset($1, $3, 0) == -1)
145 				fatal("cannot store variable");
146 			free($1);
147 			free($3);
148 		}
149 		;
150 
151 boolean		: STRING {
152 			if (strcasecmp($1, "1") == 0 ||
153 			    strcasecmp($1, "on") == 0)
154 				$$ = 1;
155 			else if (strcasecmp($1, "0") == 0 ||
156 			    strcasecmp($1, "off") == 0)
157 				$$ = 0;
158 			else {
159 				yyerror("invalid boolean value '%s'", $1);
160 				free($1);
161 				YYERROR;
162 			}
163 			free($1);
164 		}
165 		| ON { $$ = 1; }
166 		| NUMBER {
167 			if ($1 != 0 && $1 != 1) {
168 				yyerror("invalid boolean value '%lld'", $1);
169 				YYERROR;
170 			}
171 			$$ = $1;
172 		}
173 		;
174 
175 listen_addr	: '*' { $$ = NULL; }
176 		| STRING
177 		;
178 
179 main		: PREFORK NUMBER {
180 			if ($2 <= 0 || $2 > PROC_MAX_INSTANCES) {
181 				yyerror("prefork is %s: %lld",
182 				    $2 <= 0 ? "too small" : "too large", $2);
183 				YYERROR;
184 			}
185 			gotwebd->prefork_gotwebd = $2;
186 		}
187 		| CHROOT STRING {
188 			if (*$2 == '\0') {
189 				yyerror("chroot path can't be an empty"
190 				    " string");
191 				free($2);
192 				YYERROR;
193 			}
194 
195 			n = strlcpy(gotwebd->httpd_chroot, $2,
196 			    sizeof(gotwebd->httpd_chroot));
197 			if (n >= sizeof(gotwebd->httpd_chroot)) {
198 				yyerror("%s: httpd_chroot truncated", __func__);
199 				free($2);
200 				YYERROR;
201 			}
202 			free($2);
203 		}
204 		| UNIX_SOCKET boolean {
205 			gotwebd->unix_socket = $2;
206 		}
207 		| UNIX_SOCKET_NAME STRING {
208 			n = snprintf(gotwebd->unix_socket_name,
209 			    sizeof(gotwebd->unix_socket_name), "%s%s",
210 			    gotwebd->httpd_chroot, $2);
211 			if (n < 0 ||
212 			    (size_t)n >= sizeof(gotwebd->unix_socket_name)) {
213 				yyerror("%s: unix_socket_name truncated",
214 				    __func__);
215 				free($2);
216 				YYERROR;
217 			}
218 			free($2);
219 		}
220 		;
221 
222 server		: SERVER STRING {
223 			struct server *srv;
224 
225 			TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
226 				if (strcmp(srv->name, $2) == 0) {
227 					yyerror("server name exists '%s'", $2);
228 					free($2);
229 					YYERROR;
230 				}
231 			}
232 
233 			new_srv = conf_new_server($2);
234 			log_debug("adding server %s", $2);
235 			free($2);
236 		}
237 		| SERVER STRING {
238 			struct server *srv;
239 
240 			TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
241 				if (strcmp(srv->name, $2) == 0) {
242 					yyerror("server name exists '%s'", $2);
243 					free($2);
244 					YYERROR;
245 				}
246 			}
247 
248 			new_srv = conf_new_server($2);
249 			log_debug("adding server %s", $2);
250 			free($2);
251 		} '{' optnl serveropts2 '}' {
252 		}
253 		;
254 
255 serveropts1	: REPOS_PATH STRING {
256 			n = strlcpy(new_srv->repos_path, $2,
257 			    sizeof(new_srv->repos_path));
258 			if (n >= sizeof(new_srv->repos_path)) {
259 				yyerror("%s: repos_path truncated", __func__);
260 				free($2);
261 				YYERROR;
262 			}
263 			free($2);
264 		}
265 		| SITE_NAME STRING {
266 			n = strlcpy(new_srv->site_name, $2,
267 			    sizeof(new_srv->site_name));
268 			if (n >= sizeof(new_srv->site_name)) {
269 				yyerror("%s: site_name truncated", __func__);
270 				free($2);
271 				YYERROR;
272 			}
273 			free($2);
274 		}
275 		| SITE_OWNER STRING {
276 			n = strlcpy(new_srv->site_owner, $2,
277 			    sizeof(new_srv->site_owner));
278 			if (n >= sizeof(new_srv->site_owner)) {
279 				yyerror("%s: site_owner truncated", __func__);
280 				free($2);
281 				YYERROR;
282 			}
283 			free($2);
284 		}
285 		| SITE_LINK STRING {
286 			n = strlcpy(new_srv->site_link, $2,
287 			    sizeof(new_srv->site_link));
288 			if (n >= sizeof(new_srv->site_link)) {
289 				yyerror("%s: site_link truncated", __func__);
290 				free($2);
291 				YYERROR;
292 			}
293 			free($2);
294 		}
295 		| LOGO STRING {
296 			n = strlcpy(new_srv->logo, $2, sizeof(new_srv->logo));
297 			if (n >= sizeof(new_srv->logo)) {
298 				yyerror("%s: logo truncated", __func__);
299 				free($2);
300 				YYERROR;
301 			}
302 			free($2);
303 		}
304 		| LOGO_URL STRING {
305 			n = strlcpy(new_srv->logo_url, $2,
306 			    sizeof(new_srv->logo_url));
307 			if (n >= sizeof(new_srv->logo_url)) {
308 				yyerror("%s: logo_url truncated", __func__);
309 				free($2);
310 				YYERROR;
311 			}
312 			free($2);
313 		}
314 		| CUSTOM_CSS STRING {
315 			n = strlcpy(new_srv->custom_css, $2,
316 			    sizeof(new_srv->custom_css));
317 			if (n >= sizeof(new_srv->custom_css)) {
318 				yyerror("%s: custom_css truncated", __func__);
319 				free($2);
320 				YYERROR;
321 			}
322 			free($2);
323 		}
324 		| LISTEN ON listen_addr PORT STRING {
325 			if (get_addrs($3, $5, new_srv) == -1) {
326 				yyerror("could not get addrs");
327 				YYERROR;
328 			}
329 			free($3);
330 			free($5);
331 			new_srv->fcgi_socket = 1;
332 		}
333 		| LISTEN ON listen_addr PORT NUMBER {
334 			char portno[32];
335 			int n;
336 
337 			n = snprintf(portno, sizeof(portno), "%lld",
338 			    (long long)$5);
339 			if (n < 0 || (size_t)n >= sizeof(portno))
340 				fatalx("port number too long: %lld",
341 				    (long long)$5);
342 
343 			if (get_addrs($3, portno, new_srv) == -1) {
344 				yyerror("could not get addrs");
345 				YYERROR;
346 			}
347 			free($3);
348 			new_srv->fcgi_socket = 1;
349 		}
350 		| LISTEN ON SOCKET STRING {
351 			if (strcasecmp($4, "off") == 0) {
352 				new_srv->unix_socket = 0;
353 				free($4);
354 				YYACCEPT;
355 			}
356 
357 			new_srv->unix_socket = 1;
358 
359 			n = snprintf(new_srv->unix_socket_name,
360 			    sizeof(new_srv->unix_socket_name), "%s%s",
361 			    gotwebd->httpd_chroot, $4);
362 			if (n < 0 ||
363 			    (size_t)n >= sizeof(new_srv->unix_socket_name)) {
364 				yyerror("%s: unix_socket_name truncated",
365 				    __func__);
366 				free($4);
367 				YYERROR;
368 			}
369 			free($4);
370 		}
371 		| MAX_REPOS NUMBER {
372 			if ($2 <= 0) {
373 				yyerror("max_repos is too small: %lld", $2);
374 				YYERROR;
375 			}
376 			new_srv->max_repos = $2;
377 		}
378 		| SHOW_SITE_OWNER boolean {
379 			new_srv->show_site_owner = $2;
380 		}
381 		| SHOW_REPO_OWNER boolean {
382 			new_srv->show_repo_owner = $2;
383 		}
384 		| SHOW_REPO_AGE boolean {
385 			new_srv->show_repo_age = $2;
386 		}
387 		| SHOW_REPO_DESCRIPTION boolean {
388 			new_srv->show_repo_description = $2;
389 		}
390 		| SHOW_REPO_CLONEURL boolean {
391 			new_srv->show_repo_cloneurl = $2;
392 		}
393 		| RESPECT_EXPORTOK boolean {
394 			new_srv->respect_exportok = $2;
395 		}
396 		| MAX_REPOS_DISPLAY NUMBER {
397 			if ($2 < 0) {
398 				yyerror("max_repos_display is too small: %lld",
399 				    $2);
400 				YYERROR;
401 			}
402 			new_srv->max_repos_display = $2;
403 		}
404 		| MAX_COMMITS_DISPLAY NUMBER {
405 			if ($2 <= 1) {
406 				yyerror("max_commits_display is too small:"
407 				    " %lld", $2);
408 				YYERROR;
409 			}
410 			new_srv->max_commits_display = $2;
411 		}
412 		;
413 
414 serveropts2	: serveropts2 serveropts1 nl
415 		| serveropts1 optnl
416 		;
417 
418 nl		: '\n' optnl
419 		;
420 
421 optnl		: '\n' optnl		/* zero or more newlines */
422 		| /* empty */
423 		;
424 
425 %%
426 
427 struct keywords {
428 	const char	*k_name;
429 	int		 k_val;
430 };
431 
432 int
433 yyerror(const char *fmt, ...)
434 {
435 	va_list ap;
436 	char *msg;
437 
438 	file->errors++;
439 	va_start(ap, fmt);
440 	if (vasprintf(&msg, fmt, ap) == -1)
441 		fatalx("yyerror vasprintf");
442 	va_end(ap);
443 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
444 	free(msg);
445 	return (0);
446 }
447 
448 int
449 kw_cmp(const void *k, const void *e)
450 {
451 	return (strcmp(k, ((const struct keywords *)e)->k_name));
452 }
453 
454 int
455 lookup(char *s)
456 {
457 	/* This has to be sorted always. */
458 	static const struct keywords keywords[] = {
459 		{ "chroot",			CHROOT },
460 		{ "custom_css",			CUSTOM_CSS },
461 		{ "listen",			LISTEN },
462 		{ "logo",			LOGO },
463 		{ "logo_url",			LOGO_URL },
464 		{ "max_commits_display",	MAX_COMMITS_DISPLAY },
465 		{ "max_repos",			MAX_REPOS },
466 		{ "max_repos_display",		MAX_REPOS_DISPLAY },
467 		{ "on",				ON },
468 		{ "port",			PORT },
469 		{ "prefork",			PREFORK },
470 		{ "repos_path",			REPOS_PATH },
471 		{ "respect_exportok",		RESPECT_EXPORTOK },
472 		{ "server",			SERVER },
473 		{ "show_repo_age",		SHOW_REPO_AGE },
474 		{ "show_repo_cloneurl",		SHOW_REPO_CLONEURL },
475 		{ "show_repo_description",	SHOW_REPO_DESCRIPTION },
476 		{ "show_repo_owner",		SHOW_REPO_OWNER },
477 		{ "show_site_owner",		SHOW_SITE_OWNER },
478 		{ "site_link",			SITE_LINK },
479 		{ "site_name",			SITE_NAME },
480 		{ "site_owner",			SITE_OWNER },
481 		{ "socket",			SOCKET },
482 		{ "unix_socket",		UNIX_SOCKET },
483 		{ "unix_socket_name",		UNIX_SOCKET_NAME },
484 	};
485 	const struct keywords *p;
486 
487 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
488 	    sizeof(keywords[0]), kw_cmp);
489 
490 	if (p)
491 		return (p->k_val);
492 	else
493 		return (STRING);
494 }
495 
496 #define MAXPUSHBACK	128
497 
498 unsigned char *parsebuf;
499 int parseindex;
500 unsigned char pushback_buffer[MAXPUSHBACK];
501 int pushback_index = 0;
502 
503 int
504 lgetc(int quotec)
505 {
506 	int c, next;
507 
508 	if (parsebuf) {
509 		/* Read character from the parsebuffer instead of input. */
510 		if (parseindex >= 0) {
511 			c = parsebuf[parseindex++];
512 			if (c != '\0')
513 				return (c);
514 			parsebuf = NULL;
515 		} else
516 			parseindex++;
517 	}
518 
519 	if (pushback_index)
520 		return (pushback_buffer[--pushback_index]);
521 
522 	if (quotec) {
523 		c = getc(file->stream);
524 		if (c == EOF)
525 			yyerror("reached end of file while parsing "
526 			    "quoted string");
527 		return (c);
528 	}
529 
530 	c = getc(file->stream);
531 	while (c == '\\') {
532 		next = getc(file->stream);
533 		if (next != '\n') {
534 			c = next;
535 			break;
536 		}
537 		yylval.lineno = file->lineno;
538 		file->lineno++;
539 		c = getc(file->stream);
540 	}
541 
542 	return (c);
543 }
544 
545 int
546 lungetc(int c)
547 {
548 	if (c == EOF)
549 		return (EOF);
550 	if (parsebuf) {
551 		parseindex--;
552 		if (parseindex >= 0)
553 			return (c);
554 	}
555 	if (pushback_index < MAXPUSHBACK-1)
556 		return (pushback_buffer[pushback_index++] = c);
557 	else
558 		return (EOF);
559 }
560 
561 int
562 findeol(void)
563 {
564 	int c;
565 
566 	parsebuf = NULL;
567 
568 	/* Skip to either EOF or the first real EOL. */
569 	while (1) {
570 		if (pushback_index)
571 			c = pushback_buffer[--pushback_index];
572 		else
573 			c = lgetc(0);
574 		if (c == '\n') {
575 			file->lineno++;
576 			break;
577 		}
578 		if (c == EOF)
579 			break;
580 	}
581 	return (ERROR);
582 }
583 
584 int
585 yylex(void)
586 {
587 	unsigned char buf[8096];
588 	unsigned char *p, *val;
589 	int quotec, next, c;
590 	int token;
591 
592 top:
593 	p = buf;
594 	c = lgetc(0);
595 	while (c == ' ' || c == '\t')
596 		c = lgetc(0); /* nothing */
597 
598 	yylval.lineno = file->lineno;
599 	if (c == '#') {
600 		c = lgetc(0);
601 		while (c != '\n' && c != EOF)
602 			c = lgetc(0); /* nothing */
603 	}
604 	if (c == '$' && parsebuf == NULL) {
605 		while (1) {
606 			c = lgetc(0);
607 			if (c == EOF)
608 				return (0);
609 
610 			if (p + 1 >= buf + sizeof(buf) - 1) {
611 				yyerror("string too long");
612 				return (findeol());
613 			}
614 			if (isalnum(c) || c == '_') {
615 				*p++ = c;
616 				continue;
617 			}
618 			*p = '\0';
619 			lungetc(c);
620 			break;
621 		}
622 		val = symget(buf);
623 		if (val == NULL) {
624 			yyerror("macro '%s' not defined", buf);
625 			return (findeol());
626 		}
627 		parsebuf = val;
628 		parseindex = 0;
629 		goto top;
630 	}
631 
632 	switch (c) {
633 	case '\'':
634 	case '"':
635 		quotec = c;
636 		while (1) {
637 			c = lgetc(quotec);
638 			if (c == EOF)
639 				return (0);
640 			if (c == '\n') {
641 				file->lineno++;
642 				continue;
643 			} else if (c == '\\') {
644 				next = lgetc(quotec);
645 				if (next == EOF)
646 					return (0);
647 				if (next == quotec || c == ' ' || c == '\t')
648 					c = next;
649 				else if (next == '\n') {
650 					file->lineno++;
651 					continue;
652 				} else
653 					lungetc(next);
654 			} else if (c == quotec) {
655 				*p = '\0';
656 				break;
657 			} else if (c == '\0') {
658 				yyerror("syntax error");
659 				return (findeol());
660 			}
661 			if (p + 1 >= buf + sizeof(buf) - 1) {
662 				yyerror("string too long");
663 				return (findeol());
664 			}
665 			*p++ = c;
666 		}
667 		yylval.v.string = strdup(buf);
668 		if (yylval.v.string == NULL)
669 			err(1, "yylex: strdup");
670 		return (STRING);
671 	}
672 
673 #define allowed_to_end_number(x) \
674 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
675 
676 	if (c == '-' || isdigit(c)) {
677 		do {
678 			*p++ = c;
679 			if ((unsigned)(p-buf) >= sizeof(buf)) {
680 				yyerror("string too long");
681 				return (findeol());
682 			}
683 			c = lgetc(0);
684 		} while (c != EOF && isdigit(c));
685 		lungetc(c);
686 		if (p == buf + 1 && buf[0] == '-')
687 			goto nodigits;
688 		if (c == EOF || allowed_to_end_number(c)) {
689 			const char *errstr = NULL;
690 
691 			*p = '\0';
692 			yylval.v.number = strtonum(buf, LLONG_MIN,
693 			    LLONG_MAX, &errstr);
694 			if (errstr) {
695 				yyerror("\"%s\" invalid number: %s",
696 				    buf, errstr);
697 				return (findeol());
698 			}
699 			return (NUMBER);
700 		} else {
701 nodigits:
702 			while (p > buf + 1)
703 				lungetc(*--p);
704 			c = *--p;
705 			if (c == '-')
706 				return (c);
707 		}
708 	}
709 
710 #define allowed_in_string(x) \
711 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
712 	x != '{' && x != '}' && \
713 	x != '!' && x != '=' && x != '#' && \
714 	x != ','))
715 
716 	if (isalnum(c) || c == ':' || c == '_') {
717 		do {
718 			*p++ = c;
719 			if ((unsigned)(p-buf) >= sizeof(buf)) {
720 				yyerror("string too long");
721 				return (findeol());
722 			}
723 			c = lgetc(0);
724 		} while (c != EOF && (allowed_in_string(c)));
725 		lungetc(c);
726 		*p = '\0';
727 		token = lookup(buf);
728 		if (token == STRING) {
729 			yylval.v.string = strdup(buf);
730 			if (yylval.v.string == NULL)
731 				err(1, "yylex: strdup");
732 		}
733 		return (token);
734 	}
735 	if (c == '\n') {
736 		yylval.lineno = file->lineno;
737 		file->lineno++;
738 	}
739 	if (c == EOF)
740 		return (0);
741 	return (c);
742 }
743 
744 int
745 check_file_secrecy(int fd, const char *fname)
746 {
747 	struct stat st;
748 
749 	if (fstat(fd, &st)) {
750 		log_warn("cannot stat %s", fname);
751 		return (-1);
752 	}
753 	if (st.st_uid != 0 && st.st_uid != getuid()) {
754 		log_warnx("%s: owner not root or current user", fname);
755 		return (-1);
756 	}
757 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
758 		log_warnx("%s: group writable or world read/writable", fname);
759 		return (-1);
760 	}
761 	return (0);
762 }
763 
764 struct file *
765 newfile(const char *name, int secret)
766 {
767 	struct file *nfile;
768 
769 	nfile = calloc(1, sizeof(struct file));
770 	if (nfile == NULL) {
771 		log_warn("calloc");
772 		return (NULL);
773 	}
774 	nfile->name = strdup(name);
775 	if (nfile->name == NULL) {
776 		log_warn("strdup");
777 		free(nfile);
778 		return (NULL);
779 	}
780 	nfile->stream = fopen(nfile->name, "r");
781 	if (nfile->stream == NULL) {
782 		/* no warning, we don't require a conf file */
783 		free(nfile->name);
784 		free(nfile);
785 		return (NULL);
786 	} else if (secret &&
787 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
788 		fclose(nfile->stream);
789 		free(nfile->name);
790 		free(nfile);
791 		return (NULL);
792 	}
793 	nfile->lineno = 1;
794 	return (nfile);
795 }
796 
797 static void
798 closefile(struct file *xfile)
799 {
800 	fclose(xfile->stream);
801 	free(xfile->name);
802 	free(xfile);
803 }
804 
805 static void
806 add_default_server(void)
807 {
808 	new_srv = conf_new_server(D_SITENAME);
809 	log_debug("%s: adding default server %s", __func__, D_SITENAME);
810 }
811 
812 int
813 parse_config(const char *filename, struct gotwebd *env)
814 {
815 	struct sym *sym, *next;
816 
817 	if (config_init(env) == -1)
818 		fatalx("failed to initialize configuration");
819 
820 	gotwebd = env;
821 
822 	file = newfile(filename, 0);
823 	if (file == NULL) {
824 		add_default_server();
825 		sockets_parse_sockets(env);
826 		/* just return, as we don't require a conf file */
827 		return (0);
828 	}
829 
830 	yyparse();
831 	errors = file->errors;
832 	closefile(file);
833 
834 	/* Free macros and check which have not been used. */
835 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
836 		if ((gotwebd->gotwebd_verbose > 1) && !sym->used)
837 			fprintf(stderr, "warning: macro '%s' not used\n",
838 			    sym->nam);
839 		if (!sym->persist) {
840 			free(sym->nam);
841 			free(sym->val);
842 			TAILQ_REMOVE(&symhead, sym, entry);
843 			free(sym);
844 		}
845 	}
846 
847 	if (errors)
848 		return (-1);
849 
850 	/* just add default server if no config specified */
851 	if (gotwebd->server_cnt == 0)
852 		add_default_server();
853 
854 	/* setup our listening sockets */
855 	sockets_parse_sockets(env);
856 
857 	return (0);
858 }
859 
860 struct server *
861 conf_new_server(const char *name)
862 {
863 	struct server *srv = NULL;
864 
865 	srv = calloc(1, sizeof(*srv));
866 	if (srv == NULL)
867 		fatalx("%s: calloc", __func__);
868 
869 	n = strlcpy(srv->name, name, sizeof(srv->name));
870 	if (n >= sizeof(srv->name))
871 		fatalx("%s: strlcpy", __func__);
872 	n = snprintf(srv->unix_socket_name,
873 	    sizeof(srv->unix_socket_name), "%s%s", D_HTTPD_CHROOT,
874 	    D_UNIX_SOCKET);
875 	if (n < 0 || (size_t)n >= sizeof(srv->unix_socket_name))
876 		fatalx("%s: snprintf", __func__);
877 	n = strlcpy(srv->repos_path, D_GOTPATH,
878 	    sizeof(srv->repos_path));
879 	if (n >= sizeof(srv->repos_path))
880 		fatalx("%s: strlcpy", __func__);
881 	n = strlcpy(srv->site_name, D_SITENAME,
882 	    sizeof(srv->site_name));
883 	if (n >= sizeof(srv->site_name))
884 		fatalx("%s: strlcpy", __func__);
885 	n = strlcpy(srv->site_owner, D_SITEOWNER,
886 	    sizeof(srv->site_owner));
887 	if (n >= sizeof(srv->site_owner))
888 		fatalx("%s: strlcpy", __func__);
889 	n = strlcpy(srv->site_link, D_SITELINK,
890 	    sizeof(srv->site_link));
891 	if (n >= sizeof(srv->site_link))
892 		fatalx("%s: strlcpy", __func__);
893 	n = strlcpy(srv->logo, D_GOTLOGO,
894 	    sizeof(srv->logo));
895 	if (n >= sizeof(srv->logo))
896 		fatalx("%s: strlcpy", __func__);
897 	n = strlcpy(srv->logo_url, D_GOTURL, sizeof(srv->logo_url));
898 	if (n >= sizeof(srv->logo_url))
899 		fatalx("%s: strlcpy", __func__);
900 	n = strlcpy(srv->custom_css, D_GOTWEBCSS, sizeof(srv->custom_css));
901 	if (n >= sizeof(srv->custom_css))
902 		fatalx("%s: strlcpy", __func__);
903 
904 	srv->show_site_owner = D_SHOWSOWNER;
905 	srv->show_repo_owner = D_SHOWROWNER;
906 	srv->show_repo_age = D_SHOWAGE;
907 	srv->show_repo_description = D_SHOWDESC;
908 	srv->show_repo_cloneurl = D_SHOWURL;
909 	srv->respect_exportok = D_RESPECTEXPORTOK;
910 
911 	srv->max_repos_display = D_MAXREPODISP;
912 	srv->max_commits_display = D_MAXCOMMITDISP;
913 	srv->max_repos = D_MAXREPO;
914 
915 	srv->unix_socket = 1;
916 	srv->fcgi_socket = 0;
917 
918 	TAILQ_INIT(&srv->al);
919 	TAILQ_INSERT_TAIL(&gotwebd->servers, srv, entry);
920 	gotwebd->server_cnt++;
921 
922 	return srv;
923 };
924 
925 int
926 symset(const char *nam, const char *val, int persist)
927 {
928 	struct sym *sym;
929 
930 	TAILQ_FOREACH(sym, &symhead, entry) {
931 		if (strcmp(nam, sym->nam) == 0)
932 			break;
933 	}
934 
935 	if (sym != NULL) {
936 		if (sym->persist == 1)
937 			return (0);
938 		else {
939 			free(sym->nam);
940 			free(sym->val);
941 			TAILQ_REMOVE(&symhead, sym, entry);
942 			free(sym);
943 		}
944 	}
945 	sym = calloc(1, sizeof(*sym));
946 	if (sym == NULL)
947 		return (-1);
948 
949 	sym->nam = strdup(nam);
950 	if (sym->nam == NULL) {
951 		free(sym);
952 		return (-1);
953 	}
954 	sym->val = strdup(val);
955 	if (sym->val == NULL) {
956 		free(sym->nam);
957 		free(sym);
958 		return (-1);
959 	}
960 	sym->used = 0;
961 	sym->persist = persist;
962 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
963 	return (0);
964 }
965 
966 int
967 cmdline_symset(char *s)
968 {
969 	char *sym, *val;
970 	int ret;
971 
972 	val = strrchr(s, '=');
973 	if (val == NULL)
974 		return (-1);
975 
976 	sym = strndup(s, val - s);
977 	if (sym == NULL)
978 		fatal("%s: strndup", __func__);
979 
980 	ret = symset(sym, val + 1, 1);
981 	free(sym);
982 
983 	return (ret);
984 }
985 
986 char *
987 symget(const char *nam)
988 {
989 	struct sym *sym;
990 
991 	TAILQ_FOREACH(sym, &symhead, entry) {
992 		if (strcmp(nam, sym->nam) == 0) {
993 			sym->used = 1;
994 			return (sym->val);
995 		}
996 	}
997 	return (NULL);
998 }
999 
1000 int
1001 get_addrs(const char *hostname, const char *servname, struct server *new_srv)
1002 {
1003 	struct addrinfo hints, *res0, *res;
1004 	int error;
1005 	struct sockaddr_in *sin;
1006 	struct sockaddr_in6 *sin6;
1007 	struct address *h;
1008 
1009 	memset(&hints, 0, sizeof(hints));
1010 	hints.ai_family = AF_UNSPEC;
1011 	hints.ai_socktype = SOCK_STREAM;
1012 	hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
1013 	error = getaddrinfo(hostname, servname, &hints, &res0);
1014 	if (error) {
1015 		log_warnx("%s: could not parse \"%s:%s\": %s", __func__,
1016 		    hostname, servname, gai_strerror(error));
1017 		return (-1);
1018 	}
1019 
1020 	for (res = res0; res; res = res->ai_next) {
1021 		if ((h = calloc(1, sizeof(*h))) == NULL)
1022 			fatal(__func__);
1023 
1024 		if (hostname == NULL) {
1025 			strlcpy(h->ifname, "*", sizeof(h->ifname));
1026 		} else {
1027 			if (strlcpy(h->ifname, hostname, sizeof(h->ifname)) >=
1028 			    sizeof(h->ifname)) {
1029 				log_warnx("%s: address truncated: %s",
1030 				    __func__, hostname);
1031 				freeaddrinfo(res0);
1032 				free(h);
1033 				return (-1);
1034 			}
1035 		}
1036 
1037 		h->ai_family = res->ai_family;
1038 		h->ai_socktype = res->ai_socktype;
1039 		h->ai_protocol = res->ai_protocol;
1040 		memcpy(&h->ss, res->ai_addr, res->ai_addrlen);
1041 		h->slen = res->ai_addrlen;
1042 
1043 		switch (res->ai_family) {
1044 		case AF_INET:
1045 			sin = (struct sockaddr_in *)res->ai_addr;
1046 			h->port = ntohs(sin->sin_port);
1047 			break;
1048 		case AF_INET6:
1049 			sin6 = (struct sockaddr_in6 *)res->ai_addr;
1050 			h->port = ntohs(sin6->sin6_port);
1051 			break;
1052 		default:
1053 			fatalx("unknown address family %d", res->ai_family);
1054 		}
1055 
1056 		if (add_addr(new_srv, h))
1057 			return -1;
1058 	}
1059 	freeaddrinfo(res0);
1060 	return (0);
1061 }
1062 
1063 int
1064 addr_dup_check(struct addresslist *al, struct address *h, const char *new_srv,
1065     const char *other_srv)
1066 {
1067 	struct address *a;
1068 	void *ia;
1069 	char buf[INET6_ADDRSTRLEN];
1070 	const char *addrstr;
1071 
1072 	TAILQ_FOREACH(a, al, entry) {
1073 		if (a->ai_family != h->ai_family ||
1074 		    a->ai_socktype != h->ai_socktype ||
1075 		    a->ai_protocol != h->ai_protocol ||
1076 		    a->slen != h->slen ||
1077 		    memcmp(&a->ss, &h->ss, a->slen) != 0)
1078 			continue;
1079 
1080 		switch (h->ss.ss_family) {
1081 		case AF_INET:
1082 			ia = &((struct sockaddr_in *)(&h->ss))->sin_addr;
1083 			break;
1084 		case AF_INET6:
1085 			ia = &((struct sockaddr_in6 *)(&h->ss))->sin6_addr;
1086 			break;
1087 		default:
1088 			yyerror("unknown address family: %d", h->ss.ss_family);
1089 			return -1;
1090 		}
1091 		addrstr = inet_ntop(h->ss.ss_family, ia, buf, sizeof(buf));
1092 		if (addrstr) {
1093 			if (other_srv) {
1094 				yyerror("server %s: duplicate fcgi listen "
1095 				    "address %s:%d, already used by server %s",
1096 				    new_srv, addrstr, h->port, other_srv);
1097 			} else {
1098 				log_warnx("server: %s: duplicate fcgi listen "
1099 				    "address %s:%d", new_srv, addrstr, h->port);
1100 			}
1101 		} else {
1102 			if (other_srv) {
1103 				yyerror("server: %s: duplicate fcgi listen "
1104 				    "address, already used by server %s",
1105 				    new_srv, other_srv);
1106 			} else {
1107 				log_warnx("server %s: duplicate fcgi listen "
1108 				    "address", new_srv);
1109 			}
1110 		}
1111 
1112 		return -1;
1113 	}
1114 
1115 	return 0;
1116 }
1117 
1118 int
1119 add_addr(struct server *new_srv, struct address *h)
1120 {
1121 	struct server *srv;
1122 
1123 	/* Address cannot be shared between different servers. */
1124 	TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
1125 		if (srv == new_srv)
1126 			continue;
1127 		if (addr_dup_check(&srv->al, h, new_srv->name, srv->name))
1128 			return -1;
1129 	}
1130 
1131 	/* Tolerate duplicate address lines within the scope of a server. */
1132 	if (addr_dup_check(&new_srv->al, h, NULL, NULL) == 0)
1133 		TAILQ_INSERT_TAIL(&new_srv->al, h, entry);
1134 	else
1135 		free(h);
1136 
1137 	return 0;
1138 }