1 /*
2  * Copyright (c) 2016-2019, 2020-2021 Tracey Emery <tracey@traceyemery.net>
3  * Copyright (c) 2004, 2005 Esben Norby <norby@openbsd.org>
4  * Copyright (c) 2004 Ryan McBride <mcbride@openbsd.org>
5  * Copyright (c) 2002, 2003, 2004 Henning Brauer <henning@openbsd.org>
6  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
7  * Copyright (c) 2001 Daniel Hartmeier.  All rights reserved.
8  * Copyright (c) 2001 Theo de Raadt.  All rights reserved.
9  *
10  * Permission to use, copy, modify, and distribute this software for any
11  * purpose with or without fee is hereby granted, provided that the above
12  * copyright notice and this permission notice appear in all copies.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
15  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
16  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
17  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
18  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
19  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
20  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21  */
22 
23 %{
24 #include "got_compat.h"
25 
26 #include <sys/ioctl.h>
27 #include <sys/types.h>
28 #include <sys/queue.h>
29 #include <sys/socket.h>
30 #include <sys/stat.h>
31 
32 #include <net/if.h>
33 #include <netinet/in.h>
34 
35 #include <arpa/inet.h>
36 
37 #include <ctype.h>
38 #include <err.h>
39 #include <errno.h>
40 #include <event.h>
41 #include <ifaddrs.h>
42 #include <limits.h>
43 #include <netdb.h>
44 #include <stdarg.h>
45 #include <stdlib.h>
46 #include <stdio.h>
47 #include <string.h>
48 #include <syslog.h>
49 #include <unistd.h>
50 
51 #include "got_sockaddr.h"
52 #include "got_reference.h"
53 
54 #include "proc.h"
55 #include "gotwebd.h"
56 
57 TAILQ_HEAD(files, file)		 files = TAILQ_HEAD_INITIALIZER(files);
58 static struct file {
59 	TAILQ_ENTRY(file)	 entry;
60 	FILE			*stream;
61 	char			*name;
62 	int			 lineno;
63 	int			 errors;
64 } *file;
65 struct file	*newfile(const char *, int);
66 static void	 closefile(struct file *);
67 int		 check_file_secrecy(int, const char *);
68 int		 yyparse(void);
69 int		 yylex(void);
70 int		 yyerror(const char *, ...)
71     __attribute__((__format__ (printf, 1, 2)))
72     __attribute__((__nonnull__ (1)));
73 int		 kw_cmp(const void *, const void *);
74 int		 lookup(char *);
75 int		 lgetc(int);
76 int		 lungetc(int);
77 int		 findeol(void);
78 
79 TAILQ_HEAD(symhead, sym)	 symhead = TAILQ_HEAD_INITIALIZER(symhead);
80 struct sym {
81 	TAILQ_ENTRY(sym)	 entry;
82 	int			 used;
83 	int			 persist;
84 	char			*nam;
85 	char			*val;
86 };
87 
88 int	 symset(const char *, const char *, int);
89 char	*symget(const char *);
90 
91 static int		 errors;
92 
93 static struct gotwebd		*gotwebd;
94 static struct server		*new_srv;
95 static struct server		*conf_new_server(const char *);
96 int				 getservice(const char *);
97 int				 n;
98 
99 int		 get_addrs(const char *, struct server *, in_port_t);
100 int		 addr_dup_check(struct addresslist *, struct address *,
101 		    const char *, const char *);
102 int		 add_addr(struct server *, struct address *);
103 int		 host(const char *, struct server *,
104 		    int, in_port_t, const char *, int);
105 int		 host_if(const char *, struct server *,
106 		    int, in_port_t, const char *, int);
107 int		 is_if_in_group(const char *, const char *);
108 
109 typedef struct {
110 	union {
111 		long long	 number;
112 		char		*string;
113 		in_port_t	 port;
114 	} v;
115 	int lineno;
116 } YYSTYPE;
117 
118 %}
119 
120 %token	LISTEN WWW_PATH MAX_REPOS SITE_NAME SITE_OWNER SITE_LINK LOGO
121 %token	LOGO_URL SHOW_REPO_OWNER SHOW_REPO_AGE SHOW_REPO_DESCRIPTION
122 %token	MAX_REPOS_DISPLAY REPOS_PATH MAX_COMMITS_DISPLAY ON ERROR
123 %token	SHOW_SITE_OWNER SHOW_REPO_CLONEURL PORT PREFORK RESPECT_EXPORTOK
124 %token	UNIX_SOCKET UNIX_SOCKET_NAME SERVER CHROOT CUSTOM_CSS SOCKET
125 
126 %token	<v.string>	STRING
127 %type	<v.port>	fcgiport
128 %token	<v.number>	NUMBER
129 %type	<v.number>	boolean
130 
131 %%
132 
133 grammar		: /* empty */
134 		| grammar '\n'
135 		| grammar varset '\n'
136 		| grammar main '\n'
137 		| grammar server '\n'
138 		| grammar error '\n'		{ file->errors++; }
139 		;
140 
141 varset		: STRING '=' STRING	{
142 			char *s = $1;
143 			while (*s++) {
144 				if (isspace((unsigned char)*s)) {
145 					yyerror("macro name cannot contain "
146 					    "whitespace");
147 					free($1);
148 					free($3);
149 					YYERROR;
150 				}
151 			}
152 			if (symset($1, $3, 0) == -1)
153 				fatal("cannot store variable");
154 			free($1);
155 			free($3);
156 		}
157 		;
158 
159 boolean		: STRING {
160 			if (strcasecmp($1, "1") == 0 ||
161 			    strcasecmp($1, "on") == 0)
162 				$$ = 1;
163 			else if (strcasecmp($1, "0") == 0 ||
164 			    strcasecmp($1, "off") == 0)
165 				$$ = 0;
166 			else {
167 				yyerror("invalid boolean value '%s'", $1);
168 				free($1);
169 				YYERROR;
170 			}
171 			free($1);
172 		}
173 		| ON { $$ = 1; }
174 		| NUMBER {
175 			if ($1 != 0 && $1 != 1) {
176 				yyerror("invalid boolean value '%lld'", $1);
177 				YYERROR;
178 			}
179 			$$ = $1;
180 		}
181 		;
182 
183 fcgiport	: PORT NUMBER {
184 			if ($2 <= 0 || $2 > (int)USHRT_MAX) {
185 				yyerror("invalid port: %lld", $2);
186 				YYERROR;
187 			}
188 			$$ = $2;
189 		}
190 		| PORT STRING {
191 			int	 val;
192 
193 			if ((val = getservice($2)) == -1) {
194 				yyerror("invalid port: %s", $2);
195 				free($2);
196 				YYERROR;
197 			}
198 			free($2);
199 
200 			$$ = val;
201 		}
202 		;
203 
204 main		: PREFORK NUMBER {
205 			if ($2 <= 0 || $2 > PROC_MAX_INSTANCES) {
206 				yyerror("prefork is %s: %lld",
207 				    $2 <= 0 ? "too small" : "too large", $2);
208 				YYERROR;
209 			}
210 			gotwebd->prefork_gotwebd = $2;
211 		}
212 		| CHROOT STRING {
213 			if (*$2 == '\0') {
214 				yyerror("chroot path can't be an empty"
215 				    " string");
216 				free($2);
217 				YYERROR;
218 			}
219 
220 			n = strlcpy(gotwebd->httpd_chroot, $2,
221 			    sizeof(gotwebd->httpd_chroot));
222 			if (n >= sizeof(gotwebd->httpd_chroot)) {
223 				yyerror("%s: httpd_chroot truncated", __func__);
224 				free($2);
225 				YYERROR;
226 			}
227 			free($2);
228 		}
229 		| UNIX_SOCKET boolean {
230 			gotwebd->unix_socket = $2;
231 		}
232 		| UNIX_SOCKET_NAME STRING {
233 			n = snprintf(gotwebd->unix_socket_name,
234 			    sizeof(gotwebd->unix_socket_name), "%s%s",
235 			    strlen(gotwebd->httpd_chroot) ?
236 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $2);
237 			if (n < 0 ||
238 			    (size_t)n >= sizeof(gotwebd->unix_socket_name)) {
239 				yyerror("%s: unix_socket_name truncated",
240 				    __func__);
241 				free($2);
242 				YYERROR;
243 			}
244 			free($2);
245 		}
246 		;
247 
248 server		: SERVER STRING {
249 			struct server *srv;
250 
251 			TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
252 				if (strcmp(srv->name, $2) == 0) {
253 					yyerror("server name exists '%s'", $2);
254 					free($2);
255 					YYERROR;
256 				}
257 			}
258 
259 			new_srv = conf_new_server($2);
260 			log_debug("adding server %s", $2);
261 			free($2);
262 		}
263 		| SERVER STRING {
264 			struct server *srv;
265 
266 			TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
267 				if (strcmp(srv->name, $2) == 0) {
268 					yyerror("server name exists '%s'", $2);
269 					free($2);
270 					YYERROR;
271 				}
272 			}
273 
274 			new_srv = conf_new_server($2);
275 			log_debug("adding server %s", $2);
276 			free($2);
277 		} '{' optnl serveropts2 '}' {
278 		}
279 		;
280 
281 serveropts1	: REPOS_PATH STRING {
282 			n = strlcpy(new_srv->repos_path, $2,
283 			    sizeof(new_srv->repos_path));
284 			if (n >= sizeof(new_srv->repos_path)) {
285 				yyerror("%s: repos_path truncated", __func__);
286 				free($2);
287 				YYERROR;
288 			}
289 			free($2);
290 		}
291 		| SITE_NAME STRING {
292 			n = strlcpy(new_srv->site_name, $2,
293 			    sizeof(new_srv->site_name));
294 			if (n >= sizeof(new_srv->site_name)) {
295 				yyerror("%s: site_name truncated", __func__);
296 				free($2);
297 				YYERROR;
298 			}
299 			free($2);
300 		}
301 		| SITE_OWNER STRING {
302 			n = strlcpy(new_srv->site_owner, $2,
303 			    sizeof(new_srv->site_owner));
304 			if (n >= sizeof(new_srv->site_owner)) {
305 				yyerror("%s: site_owner truncated", __func__);
306 				free($2);
307 				YYERROR;
308 			}
309 			free($2);
310 		}
311 		| SITE_LINK STRING {
312 			n = strlcpy(new_srv->site_link, $2,
313 			    sizeof(new_srv->site_link));
314 			if (n >= sizeof(new_srv->site_link)) {
315 				yyerror("%s: site_link truncated", __func__);
316 				free($2);
317 				YYERROR;
318 			}
319 			free($2);
320 		}
321 		| LOGO STRING {
322 			n = strlcpy(new_srv->logo, $2, sizeof(new_srv->logo));
323 			if (n >= sizeof(new_srv->logo)) {
324 				yyerror("%s: logo truncated", __func__);
325 				free($2);
326 				YYERROR;
327 			}
328 			free($2);
329 		}
330 		| LOGO_URL STRING {
331 			n = strlcpy(new_srv->logo_url, $2,
332 			    sizeof(new_srv->logo_url));
333 			if (n >= sizeof(new_srv->logo_url)) {
334 				yyerror("%s: logo_url truncated", __func__);
335 				free($2);
336 				YYERROR;
337 			}
338 			free($2);
339 		}
340 		| CUSTOM_CSS STRING {
341 			n = strlcpy(new_srv->custom_css, $2,
342 			    sizeof(new_srv->custom_css));
343 			if (n >= sizeof(new_srv->custom_css)) {
344 				yyerror("%s: custom_css truncated", __func__);
345 				free($2);
346 				YYERROR;
347 			}
348 			free($2);
349 		}
350 		| LISTEN ON STRING fcgiport {
351 			if (get_addrs($3, new_srv, $4) == -1) {
352 				yyerror("could not get addrs");
353 				YYERROR;
354 			}
355 			new_srv->fcgi_socket = 1;
356 		}
357 		| LISTEN ON SOCKET STRING {
358 			if (strcasecmp($4, "off") == 0) {
359 				new_srv->unix_socket = 0;
360 				free($4);
361 				YYACCEPT;
362 			}
363 
364 			new_srv->unix_socket = 1;
365 
366 			n = snprintf(new_srv->unix_socket_name,
367 			    sizeof(new_srv->unix_socket_name), "%s%s",
368 			    strlen(gotwebd->httpd_chroot) ?
369 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $4);
370 			if (n < 0 ||
371 			    (size_t)n >= sizeof(new_srv->unix_socket_name)) {
372 				yyerror("%s: unix_socket_name truncated",
373 				    __func__);
374 				free($4);
375 				YYERROR;
376 			}
377 			free($4);
378 		}
379 		| MAX_REPOS NUMBER {
380 			if ($2 <= 0) {
381 				yyerror("max_repos is too small: %lld", $2);
382 				YYERROR;
383 			}
384 			new_srv->max_repos = $2;
385 		}
386 		| SHOW_SITE_OWNER boolean {
387 			new_srv->show_site_owner = $2;
388 		}
389 		| SHOW_REPO_OWNER boolean {
390 			new_srv->show_repo_owner = $2;
391 		}
392 		| SHOW_REPO_AGE boolean {
393 			new_srv->show_repo_age = $2;
394 		}
395 		| SHOW_REPO_DESCRIPTION boolean {
396 			new_srv->show_repo_description = $2;
397 		}
398 		| SHOW_REPO_CLONEURL boolean {
399 			new_srv->show_repo_cloneurl = $2;
400 		}
401 		| RESPECT_EXPORTOK boolean {
402 			new_srv->respect_exportok = $2;
403 		}
404 		| MAX_REPOS_DISPLAY NUMBER {
405 			if ($2 <= 0) {
406 				yyerror("max_repos_display is too small: %lld",
407 				    $2);
408 				YYERROR;
409 			}
410 			new_srv->max_repos_display = $2;
411 		}
412 		| MAX_COMMITS_DISPLAY NUMBER {
413 			if ($2 <= 1) {
414 				yyerror("max_commits_display is too small:"
415 				    " %lld", $2);
416 				YYERROR;
417 			}
418 			new_srv->max_commits_display = $2;
419 		}
420 		;
421 
422 serveropts2	: serveropts2 serveropts1 nl
423 		| serveropts1 optnl
424 		;
425 
426 nl		: '\n' optnl
427 		;
428 
429 optnl		: '\n' optnl		/* zero or more newlines */
430 		| /* empty */
431 		;
432 
433 %%
434 
435 struct keywords {
436 	const char	*k_name;
437 	int		 k_val;
438 };
439 
440 int
441 yyerror(const char *fmt, ...)
442 {
443 	va_list ap;
444 	char *msg;
445 
446 	file->errors++;
447 	va_start(ap, fmt);
448 	if (vasprintf(&msg, fmt, ap) == -1)
449 		fatalx("yyerror vasprintf");
450 	va_end(ap);
451 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
452 	free(msg);
453 	return (0);
454 }
455 
456 int
457 kw_cmp(const void *k, const void *e)
458 {
459 	return (strcmp(k, ((const struct keywords *)e)->k_name));
460 }
461 
462 int
463 lookup(char *s)
464 {
465 	/* This has to be sorted always. */
466 	static const struct keywords keywords[] = {
467 		{ "chroot",			CHROOT },
468 		{ "custom_css",			CUSTOM_CSS },
469 		{ "listen",			LISTEN },
470 		{ "logo",			LOGO },
471 		{ "logo_url",			LOGO_URL },
472 		{ "max_commits_display",	MAX_COMMITS_DISPLAY },
473 		{ "max_repos",			MAX_REPOS },
474 		{ "max_repos_display",		MAX_REPOS_DISPLAY },
475 		{ "on",				ON },
476 		{ "port",			PORT },
477 		{ "prefork",			PREFORK },
478 		{ "repos_path",			REPOS_PATH },
479 		{ "respect_exportok",		RESPECT_EXPORTOK },
480 		{ "server",			SERVER },
481 		{ "show_repo_age",		SHOW_REPO_AGE },
482 		{ "show_repo_cloneurl",		SHOW_REPO_CLONEURL },
483 		{ "show_repo_description",	SHOW_REPO_DESCRIPTION },
484 		{ "show_repo_owner",		SHOW_REPO_OWNER },
485 		{ "show_site_owner",		SHOW_SITE_OWNER },
486 		{ "site_link",			SITE_LINK },
487 		{ "site_name",			SITE_NAME },
488 		{ "site_owner",			SITE_OWNER },
489 		{ "socket",			SOCKET },
490 		{ "unix_socket",		UNIX_SOCKET },
491 		{ "unix_socket_name",		UNIX_SOCKET_NAME },
492 	};
493 	const struct keywords *p;
494 
495 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
496 	    sizeof(keywords[0]), kw_cmp);
497 
498 	if (p)
499 		return (p->k_val);
500 	else
501 		return (STRING);
502 }
503 
504 #define MAXPUSHBACK	128
505 
506 unsigned char *parsebuf;
507 int parseindex;
508 unsigned char pushback_buffer[MAXPUSHBACK];
509 int pushback_index = 0;
510 
511 int
512 lgetc(int quotec)
513 {
514 	int c, next;
515 
516 	if (parsebuf) {
517 		/* Read character from the parsebuffer instead of input. */
518 		if (parseindex >= 0) {
519 			c = parsebuf[parseindex++];
520 			if (c != '\0')
521 				return (c);
522 			parsebuf = NULL;
523 		} else
524 			parseindex++;
525 	}
526 
527 	if (pushback_index)
528 		return (pushback_buffer[--pushback_index]);
529 
530 	if (quotec) {
531 		c = getc(file->stream);
532 		if (c == EOF)
533 			yyerror("reached end of file while parsing "
534 			    "quoted string");
535 		return (c);
536 	}
537 
538 	c = getc(file->stream);
539 	while (c == '\\') {
540 		next = getc(file->stream);
541 		if (next != '\n') {
542 			c = next;
543 			break;
544 		}
545 		yylval.lineno = file->lineno;
546 		file->lineno++;
547 		c = getc(file->stream);
548 	}
549 
550 	return (c);
551 }
552 
553 int
554 lungetc(int c)
555 {
556 	if (c == EOF)
557 		return (EOF);
558 	if (parsebuf) {
559 		parseindex--;
560 		if (parseindex >= 0)
561 			return (c);
562 	}
563 	if (pushback_index < MAXPUSHBACK-1)
564 		return (pushback_buffer[pushback_index++] = c);
565 	else
566 		return (EOF);
567 }
568 
569 int
570 findeol(void)
571 {
572 	int c;
573 
574 	parsebuf = NULL;
575 
576 	/* Skip to either EOF or the first real EOL. */
577 	while (1) {
578 		if (pushback_index)
579 			c = pushback_buffer[--pushback_index];
580 		else
581 			c = lgetc(0);
582 		if (c == '\n') {
583 			file->lineno++;
584 			break;
585 		}
586 		if (c == EOF)
587 			break;
588 	}
589 	return (ERROR);
590 }
591 
592 int
593 yylex(void)
594 {
595 	unsigned char buf[8096];
596 	unsigned char *p, *val;
597 	int quotec, next, c;
598 	int token;
599 
600 top:
601 	p = buf;
602 	c = lgetc(0);
603 	while (c == ' ' || c == '\t')
604 		c = lgetc(0); /* nothing */
605 
606 	yylval.lineno = file->lineno;
607 	if (c == '#') {
608 		c = lgetc(0);
609 		while (c != '\n' && c != EOF)
610 			c = lgetc(0); /* nothing */
611 	}
612 	if (c == '$' && parsebuf == NULL) {
613 		while (1) {
614 			c = lgetc(0);
615 			if (c == EOF)
616 				return (0);
617 
618 			if (p + 1 >= buf + sizeof(buf) - 1) {
619 				yyerror("string too long");
620 				return (findeol());
621 			}
622 			if (isalnum(c) || c == '_') {
623 				*p++ = c;
624 				continue;
625 			}
626 			*p = '\0';
627 			lungetc(c);
628 			break;
629 		}
630 		val = symget(buf);
631 		if (val == NULL) {
632 			yyerror("macro '%s' not defined", buf);
633 			return (findeol());
634 		}
635 		parsebuf = val;
636 		parseindex = 0;
637 		goto top;
638 	}
639 
640 	switch (c) {
641 	case '\'':
642 	case '"':
643 		quotec = c;
644 		while (1) {
645 			c = lgetc(quotec);
646 			if (c == EOF)
647 				return (0);
648 			if (c == '\n') {
649 				file->lineno++;
650 				continue;
651 			} else if (c == '\\') {
652 				next = lgetc(quotec);
653 				if (next == EOF)
654 					return (0);
655 				if (next == quotec || c == ' ' || c == '\t')
656 					c = next;
657 				else if (next == '\n') {
658 					file->lineno++;
659 					continue;
660 				} else
661 					lungetc(next);
662 			} else if (c == quotec) {
663 				*p = '\0';
664 				break;
665 			} else if (c == '\0') {
666 				yyerror("syntax error");
667 				return (findeol());
668 			}
669 			if (p + 1 >= buf + sizeof(buf) - 1) {
670 				yyerror("string too long");
671 				return (findeol());
672 			}
673 			*p++ = c;
674 		}
675 		yylval.v.string = strdup(buf);
676 		if (yylval.v.string == NULL)
677 			err(1, "yylex: strdup");
678 		return (STRING);
679 	}
680 
681 #define allowed_to_end_number(x) \
682 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
683 
684 	if (c == '-' || isdigit(c)) {
685 		do {
686 			*p++ = c;
687 			if ((unsigned)(p-buf) >= sizeof(buf)) {
688 				yyerror("string too long");
689 				return (findeol());
690 			}
691 			c = lgetc(0);
692 		} while (c != EOF && isdigit(c));
693 		lungetc(c);
694 		if (p == buf + 1 && buf[0] == '-')
695 			goto nodigits;
696 		if (c == EOF || allowed_to_end_number(c)) {
697 			const char *errstr = NULL;
698 
699 			*p = '\0';
700 			yylval.v.number = strtonum(buf, LLONG_MIN,
701 			    LLONG_MAX, &errstr);
702 			if (errstr) {
703 				yyerror("\"%s\" invalid number: %s",
704 				    buf, errstr);
705 				return (findeol());
706 			}
707 			return (NUMBER);
708 		} else {
709 nodigits:
710 			while (p > buf + 1)
711 				lungetc(*--p);
712 			c = *--p;
713 			if (c == '-')
714 				return (c);
715 		}
716 	}
717 
718 #define allowed_in_string(x) \
719 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
720 	x != '{' && x != '}' && \
721 	x != '!' && x != '=' && x != '#' && \
722 	x != ','))
723 
724 	if (isalnum(c) || c == ':' || c == '_') {
725 		do {
726 			*p++ = c;
727 			if ((unsigned)(p-buf) >= sizeof(buf)) {
728 				yyerror("string too long");
729 				return (findeol());
730 			}
731 			c = lgetc(0);
732 		} while (c != EOF && (allowed_in_string(c)));
733 		lungetc(c);
734 		*p = '\0';
735 		token = lookup(buf);
736 		if (token == STRING) {
737 			yylval.v.string = strdup(buf);
738 			if (yylval.v.string == NULL)
739 				err(1, "yylex: strdup");
740 		}
741 		return (token);
742 	}
743 	if (c == '\n') {
744 		yylval.lineno = file->lineno;
745 		file->lineno++;
746 	}
747 	if (c == EOF)
748 		return (0);
749 	return (c);
750 }
751 
752 int
753 check_file_secrecy(int fd, const char *fname)
754 {
755 	struct stat st;
756 
757 	if (fstat(fd, &st)) {
758 		log_warn("cannot stat %s", fname);
759 		return (-1);
760 	}
761 	if (st.st_uid != 0 && st.st_uid != getuid()) {
762 		log_warnx("%s: owner not root or current user", fname);
763 		return (-1);
764 	}
765 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
766 		log_warnx("%s: group writable or world read/writable", fname);
767 		return (-1);
768 	}
769 	return (0);
770 }
771 
772 struct file *
773 newfile(const char *name, int secret)
774 {
775 	struct file *nfile;
776 
777 	nfile = calloc(1, sizeof(struct file));
778 	if (nfile == NULL) {
779 		log_warn("calloc");
780 		return (NULL);
781 	}
782 	nfile->name = strdup(name);
783 	if (nfile->name == NULL) {
784 		log_warn("strdup");
785 		free(nfile);
786 		return (NULL);
787 	}
788 	nfile->stream = fopen(nfile->name, "r");
789 	if (nfile->stream == NULL) {
790 		/* no warning, we don't require a conf file */
791 		free(nfile->name);
792 		free(nfile);
793 		return (NULL);
794 	} else if (secret &&
795 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
796 		fclose(nfile->stream);
797 		free(nfile->name);
798 		free(nfile);
799 		return (NULL);
800 	}
801 	nfile->lineno = 1;
802 	return (nfile);
803 }
804 
805 static void
806 closefile(struct file *xfile)
807 {
808 	fclose(xfile->stream);
809 	free(xfile->name);
810 	free(xfile);
811 }
812 
813 static void
814 add_default_server(void)
815 {
816 	new_srv = conf_new_server(D_SITENAME);
817 	log_debug("%s: adding default server %s", __func__, D_SITENAME);
818 }
819 
820 int
821 parse_config(const char *filename, struct gotwebd *env)
822 {
823 	struct sym *sym, *next;
824 
825 	if (config_init(env) == -1)
826 		fatalx("failed to initialize configuration");
827 
828 	gotwebd = env;
829 
830 	file = newfile(filename, 0);
831 	if (file == NULL) {
832 		add_default_server();
833 		sockets_parse_sockets(env);
834 		/* just return, as we don't require a conf file */
835 		return (0);
836 	}
837 
838 	yyparse();
839 	errors = file->errors;
840 	closefile(file);
841 
842 	/* Free macros and check which have not been used. */
843 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
844 		if ((gotwebd->gotwebd_verbose > 1) && !sym->used)
845 			fprintf(stderr, "warning: macro '%s' not used\n",
846 			    sym->nam);
847 		if (!sym->persist) {
848 			free(sym->nam);
849 			free(sym->val);
850 			TAILQ_REMOVE(&symhead, sym, entry);
851 			free(sym);
852 		}
853 	}
854 
855 	if (errors)
856 		return (-1);
857 
858 	/* just add default server if no config specified */
859 	if (gotwebd->server_cnt == 0)
860 		add_default_server();
861 
862 	/* setup our listening sockets */
863 	sockets_parse_sockets(env);
864 
865 	return (0);
866 }
867 
868 struct server *
869 conf_new_server(const char *name)
870 {
871 	struct server *srv = NULL;
872 
873 	srv = calloc(1, sizeof(*srv));
874 	if (srv == NULL)
875 		fatalx("%s: calloc", __func__);
876 
877 	n = strlcpy(srv->name, name, sizeof(srv->name));
878 	if (n >= sizeof(srv->name))
879 		fatalx("%s: strlcpy", __func__);
880 	n = snprintf(srv->unix_socket_name,
881 	    sizeof(srv->unix_socket_name), "%s%s", D_HTTPD_CHROOT,
882 	    D_UNIX_SOCKET);
883 	if (n < 0 || (size_t)n >= sizeof(srv->unix_socket_name))
884 		fatalx("%s: snprintf", __func__);
885 	n = strlcpy(srv->repos_path, D_GOTPATH,
886 	    sizeof(srv->repos_path));
887 	if (n >= sizeof(srv->repos_path))
888 		fatalx("%s: strlcpy", __func__);
889 	n = strlcpy(srv->site_name, D_SITENAME,
890 	    sizeof(srv->site_name));
891 	if (n >= sizeof(srv->site_name))
892 		fatalx("%s: strlcpy", __func__);
893 	n = strlcpy(srv->site_owner, D_SITEOWNER,
894 	    sizeof(srv->site_owner));
895 	if (n >= sizeof(srv->site_owner))
896 		fatalx("%s: strlcpy", __func__);
897 	n = strlcpy(srv->site_link, D_SITELINK,
898 	    sizeof(srv->site_link));
899 	if (n >= sizeof(srv->site_link))
900 		fatalx("%s: strlcpy", __func__);
901 	n = strlcpy(srv->logo, D_GOTLOGO,
902 	    sizeof(srv->logo));
903 	if (n >= sizeof(srv->logo))
904 		fatalx("%s: strlcpy", __func__);
905 	n = strlcpy(srv->logo_url, D_GOTURL, sizeof(srv->logo_url));
906 	if (n >= sizeof(srv->logo_url))
907 		fatalx("%s: strlcpy", __func__);
908 	n = strlcpy(srv->custom_css, D_GOTWEBCSS, sizeof(srv->custom_css));
909 	if (n >= sizeof(srv->custom_css))
910 		fatalx("%s: strlcpy", __func__);
911 
912 	srv->show_site_owner = D_SHOWSOWNER;
913 	srv->show_repo_owner = D_SHOWROWNER;
914 	srv->show_repo_age = D_SHOWAGE;
915 	srv->show_repo_description = D_SHOWDESC;
916 	srv->show_repo_cloneurl = D_SHOWURL;
917 	srv->respect_exportok = D_RESPECTEXPORTOK;
918 
919 	srv->max_repos_display = D_MAXREPODISP;
920 	srv->max_commits_display = D_MAXCOMMITDISP;
921 	srv->max_repos = D_MAXREPO;
922 
923 	srv->unix_socket = 1;
924 	srv->fcgi_socket = 0;
925 
926 	TAILQ_INIT(&srv->al);
927 	TAILQ_INSERT_TAIL(&gotwebd->servers, srv, entry);
928 	gotwebd->server_cnt++;
929 
930 	return srv;
931 };
932 
933 int
934 symset(const char *nam, const char *val, int persist)
935 {
936 	struct sym *sym;
937 
938 	TAILQ_FOREACH(sym, &symhead, entry) {
939 		if (strcmp(nam, sym->nam) == 0)
940 			break;
941 	}
942 
943 	if (sym != NULL) {
944 		if (sym->persist == 1)
945 			return (0);
946 		else {
947 			free(sym->nam);
948 			free(sym->val);
949 			TAILQ_REMOVE(&symhead, sym, entry);
950 			free(sym);
951 		}
952 	}
953 	sym = calloc(1, sizeof(*sym));
954 	if (sym == NULL)
955 		return (-1);
956 
957 	sym->nam = strdup(nam);
958 	if (sym->nam == NULL) {
959 		free(sym);
960 		return (-1);
961 	}
962 	sym->val = strdup(val);
963 	if (sym->val == NULL) {
964 		free(sym->nam);
965 		free(sym);
966 		return (-1);
967 	}
968 	sym->used = 0;
969 	sym->persist = persist;
970 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
971 	return (0);
972 }
973 
974 int
975 cmdline_symset(char *s)
976 {
977 	char *sym, *val;
978 	int ret;
979 
980 	val = strrchr(s, '=');
981 	if (val == NULL)
982 		return (-1);
983 
984 	sym = strndup(s, val - s);
985 	if (sym == NULL)
986 		fatal("%s: strndup", __func__);
987 
988 	ret = symset(sym, val + 1, 1);
989 	free(sym);
990 
991 	return (ret);
992 }
993 
994 char *
995 symget(const char *nam)
996 {
997 	struct sym *sym;
998 
999 	TAILQ_FOREACH(sym, &symhead, entry) {
1000 		if (strcmp(nam, sym->nam) == 0) {
1001 			sym->used = 1;
1002 			return (sym->val);
1003 		}
1004 	}
1005 	return (NULL);
1006 }
1007 
1008 int
1009 getservice(const char *n)
1010 {
1011 	struct servent *s;
1012 	const char *errstr;
1013 	long long llval;
1014 
1015 	llval = strtonum(n, 0, UINT16_MAX, &errstr);
1016 	if (errstr) {
1017 		s = getservbyname(n, "tcp");
1018 		if (s == NULL)
1019 			s = getservbyname(n, "udp");
1020 		if (s == NULL)
1021 			return (-1);
1022 		return ntohs(s->s_port);
1023 	}
1024 
1025 	return (unsigned short)llval;
1026 }
1027 
1028 int
1029 host(const char *s, struct server *new_srv, int max,
1030     in_port_t port, const char *ifname, int ipproto)
1031 {
1032 	struct addrinfo hints, *res0, *res;
1033 	int error, cnt = 0;
1034 	struct sockaddr_in *sain;
1035 	struct sockaddr_in6 *sin6;
1036 	struct address *h;
1037 
1038 	if ((cnt = host_if(s, new_srv, max, port, ifname, ipproto)) != 0)
1039 		return (cnt);
1040 
1041 	memset(&hints, 0, sizeof(hints));
1042 	hints.ai_family = AF_UNSPEC;
1043 	hints.ai_socktype = SOCK_STREAM; /* DUMMY */
1044 	hints.ai_flags = AI_ADDRCONFIG;
1045 	error = getaddrinfo(s, NULL, &hints, &res0);
1046 	if (error == EAI_AGAIN || error == EAI_NODATA || error == EAI_NONAME)
1047 		return (0);
1048 	if (error) {
1049 		log_warnx("%s: could not parse \"%s\": %s", __func__, s,
1050 		    gai_strerror(error));
1051 		return (-1);
1052 	}
1053 
1054 	for (res = res0; res && cnt < max; res = res->ai_next) {
1055 		if (res->ai_family != AF_INET &&
1056 		    res->ai_family != AF_INET6)
1057 			continue;
1058 		if ((h = calloc(1, sizeof(*h))) == NULL)
1059 			fatal(__func__);
1060 
1061 		if (port)
1062 			h->port = port;
1063 		if (ifname != NULL) {
1064 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1065 			    sizeof(h->ifname)) {
1066 				log_warnx("%s: interface name truncated",
1067 				    __func__);
1068 				freeaddrinfo(res0);
1069 				free(h);
1070 				return (-1);
1071 			}
1072 		}
1073 		if (ipproto != -1)
1074 			h->ipproto = ipproto;
1075 		h->ss.ss_family = res->ai_family;
1076 
1077 		if (res->ai_family == AF_INET) {
1078 			struct sockaddr_in *ra;
1079 			sain = (struct sockaddr_in *)&h->ss;
1080 			ra = (struct sockaddr_in *)res->ai_addr;
1081 			got_sockaddr_inet_init(sain, &ra->sin_addr);
1082 		} else {
1083 			struct sockaddr_in6 *ra;
1084 			sin6 = (struct sockaddr_in6 *)&h->ss;
1085 			ra = (struct sockaddr_in6 *)res->ai_addr;
1086 			got_sockaddr_inet6_init(sin6, &ra->sin6_addr, 0);
1087 		}
1088 
1089 		if (add_addr(new_srv, h))
1090 			return -1;
1091 		cnt++;
1092 	}
1093 	if (cnt == max && res) {
1094 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1095 		    s, max);
1096 	}
1097 	freeaddrinfo(res0);
1098 	return (cnt);
1099 }
1100 
1101 int
1102 host_if(const char *s, struct server *new_srv, int max,
1103     in_port_t port, const char *ifname, int ipproto)
1104 {
1105 	struct ifaddrs *ifap, *p;
1106 	struct sockaddr_in *sain;
1107 	struct sockaddr_in6 *sin6;
1108 	struct address *h;
1109 	int cnt = 0, af;
1110 
1111 	if (getifaddrs(&ifap) == -1)
1112 		fatal("getifaddrs");
1113 
1114 	/* First search for IPv4 addresses */
1115 	af = AF_INET;
1116 
1117  nextaf:
1118 	for (p = ifap; p != NULL && cnt < max; p = p->ifa_next) {
1119 		if (p->ifa_addr == NULL ||
1120 		    p->ifa_addr->sa_family != af ||
1121 		    (strcmp(s, p->ifa_name) != 0 &&
1122 		    !is_if_in_group(p->ifa_name, s)))
1123 			continue;
1124 		if ((h = calloc(1, sizeof(*h))) == NULL)
1125 			fatal("calloc");
1126 
1127 		if (port)
1128 			h->port = port;
1129 		if (ifname != NULL) {
1130 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1131 			    sizeof(h->ifname)) {
1132 				log_warnx("%s: interface name truncated",
1133 				    __func__);
1134 				free(h);
1135 				freeifaddrs(ifap);
1136 				return (-1);
1137 			}
1138 		}
1139 		if (ipproto != -1)
1140 			h->ipproto = ipproto;
1141 		h->ss.ss_family = af;
1142 
1143 		if (af == AF_INET) {
1144 			struct sockaddr_in *ra;
1145 			sain = (struct sockaddr_in *)&h->ss;
1146 			ra = (struct sockaddr_in *)p->ifa_addr;
1147 			got_sockaddr_inet_init(sain, &ra->sin_addr);
1148 		} else {
1149 			struct sockaddr_in6 *ra;
1150 			sin6 = (struct sockaddr_in6 *)&h->ss;
1151 			ra = (struct sockaddr_in6 *)p->ifa_addr;
1152 			got_sockaddr_inet6_init(sin6, &ra->sin6_addr,
1153 			    ra->sin6_scope_id);
1154 		}
1155 
1156 		if (add_addr(new_srv, h))
1157 			return -1;
1158 		cnt++;
1159 	}
1160 	if (af == AF_INET) {
1161 		/* Next search for IPv6 addresses */
1162 		af = AF_INET6;
1163 		goto nextaf;
1164 	}
1165 
1166 	if (cnt > max) {
1167 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1168 		    s, max);
1169 	}
1170 	freeifaddrs(ifap);
1171 	return (cnt);
1172 }
1173 
1174 int
1175 is_if_in_group(const char *ifname, const char *groupname)
1176 {
1177 /* TA: Check this... */
1178 #ifdef HAVE_STRUCT_IFGROUPREQ
1179 	unsigned int len;
1180 	struct ifgroupreq ifgr;
1181 	struct ifg_req *ifg;
1182 	int s;
1183 	int ret = 0;
1184 
1185 	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
1186 		err(1, "socket");
1187 
1188 	memset(&ifgr, 0, sizeof(ifgr));
1189 	if (strlcpy(ifgr.ifgr_name, ifname, IFNAMSIZ) >= IFNAMSIZ)
1190 		err(1, "IFNAMSIZ");
1191 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1) {
1192 		if (errno == EINVAL || errno == ENOTTY)
1193 			goto end;
1194 		err(1, "SIOCGIFGROUP");
1195 	}
1196 
1197 	len = ifgr.ifgr_len;
1198 	ifgr.ifgr_groups = calloc(len / sizeof(struct ifg_req),
1199 	    sizeof(struct ifg_req));
1200 	if (ifgr.ifgr_groups == NULL)
1201 		err(1, "getifgroups");
1202 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1)
1203 		err(1, "SIOCGIFGROUP");
1204 
1205 	ifg = ifgr.ifgr_groups;
1206 	for (; ifg && len >= sizeof(struct ifg_req); ifg++) {
1207 		len -= sizeof(struct ifg_req);
1208 		if (strcmp(ifg->ifgrq_group, groupname) == 0) {
1209 			ret = 1;
1210 			break;
1211 		}
1212 	}
1213 	free(ifgr.ifgr_groups);
1214 
1215 end:
1216 	close(s);
1217 	return (ret);
1218 #else
1219 	return (0);
1220 #endif
1221 }
1222 
1223 int
1224 get_addrs(const char *addr, struct server *new_srv, in_port_t port)
1225 {
1226 	if (strcmp("", addr) == 0) {
1227 		if (host("127.0.0.1", new_srv, 1, port, "127.0.0.1",
1228 		    -1) <= 0) {
1229 			yyerror("invalid listen ip: %s",
1230 			    "127.0.0.1");
1231 			return (-1);
1232 		}
1233 		if (host("::1", new_srv, 1, port, "::1", -1) <= 0) {
1234 			yyerror("invalid listen ip: %s", "::1");
1235 			return (-1);
1236 		}
1237 	} else {
1238 		if (host(addr, new_srv, GOTWEBD_MAXIFACE, port, addr,
1239 		    -1) <= 0) {
1240 			yyerror("invalid listen ip: %s", addr);
1241 			return (-1);
1242 		}
1243 	}
1244 	return (0);
1245 }
1246 
1247 int
1248 addr_dup_check(struct addresslist *al, struct address *h, const char *new_srv,
1249     const char *other_srv)
1250 {
1251 	struct address *a;
1252 	void *ia;
1253 	char buf[INET6_ADDRSTRLEN];
1254 	const char *addrstr;
1255 
1256 	TAILQ_FOREACH(a, al, entry) {
1257 		if (memcmp(&a->ss, &h->ss, sizeof(h->ss)) != 0 ||
1258 		    a->port != h->port)
1259 			continue;
1260 
1261 		switch (h->ss.ss_family) {
1262 		case AF_INET:
1263 			ia = &((struct sockaddr_in *)(&h->ss))->sin_addr;
1264 			break;
1265 		case AF_INET6:
1266 			ia = &((struct sockaddr_in6 *)(&h->ss))->sin6_addr;
1267 			break;
1268 		default:
1269 			yyerror("unknown address family: %d", h->ss.ss_family);
1270 			return -1;
1271 		}
1272 		addrstr = inet_ntop(h->ss.ss_family, ia, buf, sizeof(buf));
1273 		if (addrstr) {
1274 			if (other_srv) {
1275 				yyerror("server %s: duplicate fcgi listen "
1276 				    "address %s:%d, already used by server %s",
1277 				    new_srv, addrstr, h->port, other_srv);
1278 			} else {
1279 				log_warnx("server: %s: duplicate fcgi listen "
1280 				    "address %s:%d", new_srv, addrstr, h->port);
1281 			}
1282 		} else {
1283 			if (other_srv) {
1284 				yyerror("server: %s: duplicate fcgi listen "
1285 				    "address, already used by server %s",
1286 				    new_srv, other_srv);
1287 			} else {
1288 				log_warnx("server %s: duplicate fcgi listen "
1289 				    "address", new_srv);
1290 			}
1291 		}
1292 
1293 		return -1;
1294 	}
1295 
1296 	return 0;
1297 }
1298 
1299 int
1300 add_addr(struct server *new_srv, struct address *h)
1301 {
1302 	struct server *srv;
1303 
1304 	/* Address cannot be shared between different servers. */
1305 	TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
1306 		if (srv == new_srv)
1307 			continue;
1308 		if (addr_dup_check(&srv->al, h, new_srv->name, srv->name))
1309 			return -1;
1310 	}
1311 
1312 	/* Tolerate duplicate address lines within the scope of a server. */
1313 	if (addr_dup_check(&new_srv->al, h, NULL, NULL) == 0)
1314 		TAILQ_INSERT_TAIL(&new_srv->al, h, entry);
1315 	else
1316 		free(h);
1317 
1318 	return 0;
1319 }