1 /*
2  * Copyright (c) 2016-2019, 2020-2021 Tracey Emery <tracey@traceyemery.net>
3  * Copyright (c) 2004, 2005 Esben Norby <norby@openbsd.org>
4  * Copyright (c) 2004 Ryan McBride <mcbride@openbsd.org>
5  * Copyright (c) 2002, 2003, 2004 Henning Brauer <henning@openbsd.org>
6  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
7  * Copyright (c) 2001 Daniel Hartmeier.  All rights reserved.
8  * Copyright (c) 2001 Theo de Raadt.  All rights reserved.
9  *
10  * Permission to use, copy, modify, and distribute this software for any
11  * purpose with or without fee is hereby granted, provided that the above
12  * copyright notice and this permission notice appear in all copies.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
15  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
16  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
17  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
18  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
19  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
20  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21  */
22 
23 %{
24 #include <sys/ioctl.h>
25 #include <sys/types.h>
26 #include <sys/queue.h>
27 #include <sys/socket.h>
28 #include <sys/stat.h>
29 
30 #include <net/if.h>
31 #include <netinet/in.h>
32 
33 #include <arpa/inet.h>
34 
35 #include <ctype.h>
36 #include <err.h>
37 #include <errno.h>
38 #include <event.h>
39 #include <ifaddrs.h>
40 #include <imsg.h>
41 #include <limits.h>
42 #include <netdb.h>
43 #include <stdarg.h>
44 #include <stdlib.h>
45 #include <stdio.h>
46 #include <string.h>
47 #include <syslog.h>
48 #include <unistd.h>
49 
50 #include "got_sockaddr.h"
51 #include "got_reference.h"
52 
53 #include "proc.h"
54 #include "gotwebd.h"
55 
56 TAILQ_HEAD(files, file)		 files = TAILQ_HEAD_INITIALIZER(files);
57 static struct file {
58 	TAILQ_ENTRY(file)	 entry;
59 	FILE			*stream;
60 	char			*name;
61 	int			 lineno;
62 	int			 errors;
63 } *file;
64 struct file	*newfile(const char *, int);
65 static void	 closefile(struct file *);
66 int		 check_file_secrecy(int, const char *);
67 int		 yyparse(void);
68 int		 yylex(void);
69 int		 yyerror(const char *, ...)
70     __attribute__((__format__ (printf, 1, 2)))
71     __attribute__((__nonnull__ (1)));
72 int		 kw_cmp(const void *, const void *);
73 int		 lookup(char *);
74 int		 lgetc(int);
75 int		 lungetc(int);
76 int		 findeol(void);
77 
78 TAILQ_HEAD(symhead, sym)	 symhead = TAILQ_HEAD_INITIALIZER(symhead);
79 struct sym {
80 	TAILQ_ENTRY(sym)	 entry;
81 	int			 used;
82 	int			 persist;
83 	char			*nam;
84 	char			*val;
85 };
86 
87 int	 symset(const char *, const char *, int);
88 char	*symget(const char *);
89 
90 static int		 errors;
91 
92 static struct gotwebd		*gotwebd;
93 static struct server		*new_srv;
94 static struct server		*conf_new_server(const char *);
95 int				 getservice(const char *);
96 int				 n;
97 
98 int		 get_addrs(const char *, struct server *, in_port_t);
99 int		 addr_dup_check(struct addresslist *, struct address *,
100 		    const char *, const char *);
101 int		 add_addr(struct server *, struct address *);
102 struct address	*host_v4(const char *);
103 struct address	*host_v6(const char *);
104 int		 host_dns(const char *, struct server *,
105 		    int, in_port_t, const char *, int);
106 int		 host_if(const char *, struct server *,
107 		    int, in_port_t, const char *, int);
108 int		 host(const char *, struct server *,
109 		    int, in_port_t, const char *, int);
110 int		 is_if_in_group(const char *, const char *);
111 
112 typedef struct {
113 	union {
114 		long long	 number;
115 		char		*string;
116 		in_port_t	 port;
117 	} v;
118 	int lineno;
119 } YYSTYPE;
120 
121 %}
122 
123 %token	LISTEN WWW_PATH MAX_REPOS SITE_NAME SITE_OWNER SITE_LINK LOGO
124 %token	LOGO_URL SHOW_REPO_OWNER SHOW_REPO_AGE SHOW_REPO_DESCRIPTION
125 %token	MAX_REPOS_DISPLAY REPOS_PATH MAX_COMMITS_DISPLAY ON ERROR
126 %token	SHOW_SITE_OWNER SHOW_REPO_CLONEURL PORT PREFORK RESPECT_EXPORTOK
127 %token	UNIX_SOCKET UNIX_SOCKET_NAME SERVER CHROOT CUSTOM_CSS SOCKET
128 
129 %token	<v.string>	STRING
130 %type	<v.port>	fcgiport
131 %token	<v.number>	NUMBER
132 %type	<v.number>	boolean
133 
134 %%
135 
136 grammar		: /* empty */
137 		| grammar '\n'
138 		| grammar varset '\n'
139 		| grammar main '\n'
140 		| grammar server '\n'
141 		| grammar error '\n'		{ file->errors++; }
142 		;
143 
144 varset		: STRING '=' STRING	{
145 			char *s = $1;
146 			while (*s++) {
147 				if (isspace((unsigned char)*s)) {
148 					yyerror("macro name cannot contain "
149 					    "whitespace");
150 					free($1);
151 					free($3);
152 					YYERROR;
153 				}
154 			}
155 			if (symset($1, $3, 0) == -1)
156 				fatal("cannot store variable");
157 			free($1);
158 			free($3);
159 		}
160 		;
161 
162 boolean		: STRING {
163 			if (strcasecmp($1, "1") == 0 ||
164 			    strcasecmp($1, "yes") == 0 ||
165 			    strcasecmp($1, "on") == 0)
166 				$$ = 1;
167 			else if (strcasecmp($1, "0") == 0 ||
168 			    strcasecmp($1, "off") == 0 ||
169 			    strcasecmp($1, "no") == 0)
170 				$$ = 0;
171 			else {
172 				yyerror("invalid boolean value '%s'", $1);
173 				free($1);
174 				YYERROR;
175 			}
176 			free($1);
177 		}
178 		| ON { $$ = 1; }
179 		| NUMBER { $$ = $1; }
180 		;
181 
182 fcgiport	: PORT NUMBER {
183 			if ($2 <= 0 || $2 > (int)USHRT_MAX) {
184 				yyerror("invalid port: %lld", $2);
185 				YYERROR;
186 			}
187 			$$ = $2;
188 		}
189 		| PORT STRING {
190 			int	 val;
191 
192 			if ((val = getservice($2)) == -1) {
193 				yyerror("invalid port: %s", $2);
194 				free($2);
195 				YYERROR;
196 			}
197 			free($2);
198 
199 			$$ = val;
200 		}
201 		;
202 
203 main		: PREFORK NUMBER {
204 			gotwebd->prefork_gotwebd = $2;
205 		}
206 		| CHROOT STRING {
207 			n = strlcpy(gotwebd->httpd_chroot, $2,
208 			    sizeof(gotwebd->httpd_chroot));
209 			if (n >= sizeof(gotwebd->httpd_chroot)) {
210 				yyerror("%s: httpd_chroot truncated", __func__);
211 				free($2);
212 				YYERROR;
213 			}
214 			free($2);
215 		}
216 		| UNIX_SOCKET boolean {
217 			gotwebd->unix_socket = $2;
218 		}
219 		| UNIX_SOCKET_NAME STRING {
220 			n = snprintf(gotwebd->unix_socket_name,
221 			    sizeof(gotwebd->unix_socket_name), "%s%s",
222 			    strlen(gotwebd->httpd_chroot) ?
223 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $2);
224 			if (n < 0 ||
225 			    (size_t)n >= sizeof(gotwebd->unix_socket_name)) {
226 				yyerror("%s: unix_socket_name truncated",
227 				    __func__);
228 				free($2);
229 				YYERROR;
230 			}
231 			free($2);
232 		}
233 		;
234 
235 server		: SERVER STRING {
236 			struct server *srv;
237 
238 			TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
239 				if (strcmp(srv->name, $2) == 0) {
240 					yyerror("server name exists '%s'", $2);
241 					free($2);
242 					YYERROR;
243 				}
244 			}
245 
246 			new_srv = conf_new_server($2);
247 			log_debug("adding server %s", $2);
248 			free($2);
249 		}
250 		| SERVER STRING {
251 			struct server *srv;
252 
253 			TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
254 				if (strcmp(srv->name, $2) == 0) {
255 					yyerror("server name exists '%s'", $2);
256 					free($2);
257 					YYERROR;
258 				}
259 			}
260 
261 			new_srv = conf_new_server($2);
262 			log_debug("adding server %s", $2);
263 			free($2);
264 		} '{' optnl serveropts2 '}' {
265 		}
266 		;
267 
268 serveropts1	: REPOS_PATH STRING {
269 			n = strlcpy(new_srv->repos_path, $2,
270 			    sizeof(new_srv->repos_path));
271 			if (n >= sizeof(new_srv->repos_path)) {
272 				yyerror("%s: repos_path truncated", __func__);
273 				free($2);
274 				YYERROR;
275 			}
276 			free($2);
277 		}
278 		| SITE_NAME STRING {
279 			n = strlcpy(new_srv->site_name, $2,
280 			    sizeof(new_srv->site_name));
281 			if (n >= sizeof(new_srv->site_name)) {
282 				yyerror("%s: site_name truncated", __func__);
283 				free($2);
284 				YYERROR;
285 			}
286 			free($2);
287 		}
288 		| SITE_OWNER STRING {
289 			n = strlcpy(new_srv->site_owner, $2,
290 			    sizeof(new_srv->site_owner));
291 			if (n >= sizeof(new_srv->site_owner)) {
292 				yyerror("%s: site_owner truncated", __func__);
293 				free($2);
294 				YYERROR;
295 			}
296 			free($2);
297 		}
298 		| SITE_LINK STRING {
299 			n = strlcpy(new_srv->site_link, $2,
300 			    sizeof(new_srv->site_link));
301 			if (n >= sizeof(new_srv->site_link)) {
302 				yyerror("%s: site_link truncated", __func__);
303 				free($2);
304 				YYERROR;
305 			}
306 			free($2);
307 		}
308 		| LOGO STRING {
309 			n = strlcpy(new_srv->logo, $2, sizeof(new_srv->logo));
310 			if (n >= sizeof(new_srv->logo)) {
311 				yyerror("%s: logo truncated", __func__);
312 				free($2);
313 				YYERROR;
314 			}
315 			free($2);
316 		}
317 		| LOGO_URL STRING {
318 			n = strlcpy(new_srv->logo_url, $2,
319 			    sizeof(new_srv->logo_url));
320 			if (n >= sizeof(new_srv->logo_url)) {
321 				yyerror("%s: logo_url truncated", __func__);
322 				free($2);
323 				YYERROR;
324 			}
325 			free($2);
326 		}
327 		| CUSTOM_CSS STRING {
328 			n = strlcpy(new_srv->custom_css, $2,
329 			    sizeof(new_srv->custom_css));
330 			if (n >= sizeof(new_srv->custom_css)) {
331 				yyerror("%s: custom_css truncated", __func__);
332 				free($2);
333 				YYERROR;
334 			}
335 			free($2);
336 		}
337 		| LISTEN ON STRING fcgiport {
338 			if (get_addrs($3, new_srv, $4) == -1) {
339 				yyerror("could not get addrs");
340 				YYERROR;
341 			}
342 			new_srv->fcgi_socket = 1;
343 		}
344 		| LISTEN ON SOCKET STRING {
345 			if (!strcasecmp($4, "off") ||
346 			    !strcasecmp($4, "no")) {
347 				new_srv->unix_socket = 0;
348 				free($4);
349 				YYACCEPT;
350 			}
351 
352 			new_srv->unix_socket = 1;
353 
354 			n = snprintf(new_srv->unix_socket_name,
355 			    sizeof(new_srv->unix_socket_name), "%s%s",
356 			    strlen(gotwebd->httpd_chroot) ?
357 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $4);
358 			if (n < 0 ||
359 			    (size_t)n >= sizeof(new_srv->unix_socket_name)) {
360 				yyerror("%s: unix_socket_name truncated",
361 				    __func__);
362 				free($4);
363 				YYERROR;
364 			}
365 			free($4);
366 		}
367 		| MAX_REPOS NUMBER {
368 			if ($2 > 0)
369 				new_srv->max_repos = $2;
370 		}
371 		| SHOW_SITE_OWNER boolean {
372 			new_srv->show_site_owner = $2;
373 		}
374 		| SHOW_REPO_OWNER boolean {
375 			new_srv->show_repo_owner = $2;
376 		}
377 		| SHOW_REPO_AGE boolean {
378 			new_srv->show_repo_age = $2;
379 		}
380 		| SHOW_REPO_DESCRIPTION boolean {
381 			new_srv->show_repo_description = $2;
382 		}
383 		| SHOW_REPO_CLONEURL boolean {
384 			new_srv->show_repo_cloneurl = $2;
385 		}
386 		| RESPECT_EXPORTOK boolean {
387 			new_srv->respect_exportok = $2;
388 		}
389 		| MAX_REPOS_DISPLAY NUMBER {
390 				new_srv->max_repos_display = $2;
391 		}
392 		| MAX_COMMITS_DISPLAY NUMBER {
393 			if ($2 > 0)
394 				new_srv->max_commits_display = $2;
395 		}
396 		;
397 
398 serveropts2	: serveropts2 serveropts1 nl
399 		| serveropts1 optnl
400 		;
401 
402 nl		: '\n' optnl
403 		;
404 
405 optnl		: '\n' optnl		/* zero or more newlines */
406 		| /* empty */
407 		;
408 
409 %%
410 
411 struct keywords {
412 	const char	*k_name;
413 	int		 k_val;
414 };
415 
416 int
417 yyerror(const char *fmt, ...)
418 {
419 	va_list ap;
420 	char *msg;
421 
422 	file->errors++;
423 	va_start(ap, fmt);
424 	if (vasprintf(&msg, fmt, ap) == -1)
425 		fatalx("yyerror vasprintf");
426 	va_end(ap);
427 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
428 	free(msg);
429 	return (0);
430 }
431 
432 int
433 kw_cmp(const void *k, const void *e)
434 {
435 	return (strcmp(k, ((const struct keywords *)e)->k_name));
436 }
437 
438 int
439 lookup(char *s)
440 {
441 	/* This has to be sorted always. */
442 	static const struct keywords keywords[] = {
443 		{ "chroot",			CHROOT },
444 		{ "custom_css",			CUSTOM_CSS },
445 		{ "listen",			LISTEN },
446 		{ "logo",			LOGO },
447 		{ "logo_url",			LOGO_URL },
448 		{ "max_commits_display",	MAX_COMMITS_DISPLAY },
449 		{ "max_repos",			MAX_REPOS },
450 		{ "max_repos_display",		MAX_REPOS_DISPLAY },
451 		{ "on",				ON },
452 		{ "port",			PORT },
453 		{ "prefork",			PREFORK },
454 		{ "repos_path",			REPOS_PATH },
455 		{ "respect_exportok",		RESPECT_EXPORTOK },
456 		{ "server",			SERVER },
457 		{ "show_repo_age",		SHOW_REPO_AGE },
458 		{ "show_repo_cloneurl",		SHOW_REPO_CLONEURL },
459 		{ "show_repo_description",	SHOW_REPO_DESCRIPTION },
460 		{ "show_repo_owner",		SHOW_REPO_OWNER },
461 		{ "show_site_owner",		SHOW_SITE_OWNER },
462 		{ "site_link",			SITE_LINK },
463 		{ "site_name",			SITE_NAME },
464 		{ "site_owner",			SITE_OWNER },
465 		{ "socket",			SOCKET },
466 		{ "unix_socket",		UNIX_SOCKET },
467 		{ "unix_socket_name",		UNIX_SOCKET_NAME },
468 	};
469 	const struct keywords *p;
470 
471 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
472 	    sizeof(keywords[0]), kw_cmp);
473 
474 	if (p)
475 		return (p->k_val);
476 	else
477 		return (STRING);
478 }
479 
480 #define MAXPUSHBACK	128
481 
482 unsigned char *parsebuf;
483 int parseindex;
484 unsigned char pushback_buffer[MAXPUSHBACK];
485 int pushback_index = 0;
486 
487 int
488 lgetc(int quotec)
489 {
490 	int c, next;
491 
492 	if (parsebuf) {
493 		/* Read character from the parsebuffer instead of input. */
494 		if (parseindex >= 0) {
495 			c = parsebuf[parseindex++];
496 			if (c != '\0')
497 				return (c);
498 			parsebuf = NULL;
499 		} else
500 			parseindex++;
501 	}
502 
503 	if (pushback_index)
504 		return (pushback_buffer[--pushback_index]);
505 
506 	if (quotec) {
507 		c = getc(file->stream);
508 		if (c == EOF)
509 			yyerror("reached end of file while parsing "
510 			    "quoted string");
511 		return (c);
512 	}
513 
514 	c = getc(file->stream);
515 	while (c == '\\') {
516 		next = getc(file->stream);
517 		if (next != '\n') {
518 			c = next;
519 			break;
520 		}
521 		yylval.lineno = file->lineno;
522 		file->lineno++;
523 		c = getc(file->stream);
524 	}
525 
526 	return (c);
527 }
528 
529 int
530 lungetc(int c)
531 {
532 	if (c == EOF)
533 		return (EOF);
534 	if (parsebuf) {
535 		parseindex--;
536 		if (parseindex >= 0)
537 			return (c);
538 	}
539 	if (pushback_index < MAXPUSHBACK-1)
540 		return (pushback_buffer[pushback_index++] = c);
541 	else
542 		return (EOF);
543 }
544 
545 int
546 findeol(void)
547 {
548 	int c;
549 
550 	parsebuf = NULL;
551 
552 	/* Skip to either EOF or the first real EOL. */
553 	while (1) {
554 		if (pushback_index)
555 			c = pushback_buffer[--pushback_index];
556 		else
557 			c = lgetc(0);
558 		if (c == '\n') {
559 			file->lineno++;
560 			break;
561 		}
562 		if (c == EOF)
563 			break;
564 	}
565 	return (ERROR);
566 }
567 
568 int
569 yylex(void)
570 {
571 	unsigned char buf[8096];
572 	unsigned char *p, *val;
573 	int quotec, next, c;
574 	int token;
575 
576 top:
577 	p = buf;
578 	c = lgetc(0);
579 	while (c == ' ' || c == '\t')
580 		c = lgetc(0); /* nothing */
581 
582 	yylval.lineno = file->lineno;
583 	if (c == '#') {
584 		c = lgetc(0);
585 		while (c != '\n' && c != EOF)
586 			c = lgetc(0); /* nothing */
587 	}
588 	if (c == '$' && parsebuf == NULL) {
589 		while (1) {
590 			c = lgetc(0);
591 			if (c == EOF)
592 				return (0);
593 
594 			if (p + 1 >= buf + sizeof(buf) - 1) {
595 				yyerror("string too long");
596 				return (findeol());
597 			}
598 			if (isalnum(c) || c == '_') {
599 				*p++ = c;
600 				continue;
601 			}
602 			*p = '\0';
603 			lungetc(c);
604 			break;
605 		}
606 		val = symget(buf);
607 		if (val == NULL) {
608 			yyerror("macro '%s' not defined", buf);
609 			return (findeol());
610 		}
611 		parsebuf = val;
612 		parseindex = 0;
613 		goto top;
614 	}
615 
616 	switch (c) {
617 	case '\'':
618 	case '"':
619 		quotec = c;
620 		while (1) {
621 			c = lgetc(quotec);
622 			if (c == EOF)
623 				return (0);
624 			if (c == '\n') {
625 				file->lineno++;
626 				continue;
627 			} else if (c == '\\') {
628 				next = lgetc(quotec);
629 				if (next == EOF)
630 					return (0);
631 				if (next == quotec || c == ' ' || c == '\t')
632 					c = next;
633 				else if (next == '\n') {
634 					file->lineno++;
635 					continue;
636 				} else
637 					lungetc(next);
638 			} else if (c == quotec) {
639 				*p = '\0';
640 				break;
641 			} else if (c == '\0') {
642 				yyerror("syntax error");
643 				return (findeol());
644 			}
645 			if (p + 1 >= buf + sizeof(buf) - 1) {
646 				yyerror("string too long");
647 				return (findeol());
648 			}
649 			*p++ = c;
650 		}
651 		yylval.v.string = strdup(buf);
652 		if (yylval.v.string == NULL)
653 			err(1, "yylex: strdup");
654 		return (STRING);
655 	}
656 
657 #define allowed_to_end_number(x) \
658 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
659 
660 	if (c == '-' || isdigit(c)) {
661 		do {
662 			*p++ = c;
663 			if ((unsigned)(p-buf) >= sizeof(buf)) {
664 				yyerror("string too long");
665 				return (findeol());
666 			}
667 			c = lgetc(0);
668 		} while (c != EOF && isdigit(c));
669 		lungetc(c);
670 		if (p == buf + 1 && buf[0] == '-')
671 			goto nodigits;
672 		if (c == EOF || allowed_to_end_number(c)) {
673 			const char *errstr = NULL;
674 
675 			*p = '\0';
676 			yylval.v.number = strtonum(buf, LLONG_MIN,
677 			    LLONG_MAX, &errstr);
678 			if (errstr) {
679 				yyerror("\"%s\" invalid number: %s",
680 				    buf, errstr);
681 				return (findeol());
682 			}
683 			return (NUMBER);
684 		} else {
685 nodigits:
686 			while (p > buf + 1)
687 				lungetc(*--p);
688 			c = *--p;
689 			if (c == '-')
690 				return (c);
691 		}
692 	}
693 
694 #define allowed_in_string(x) \
695 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
696 	x != '{' && x != '}' && \
697 	x != '!' && x != '=' && x != '#' && \
698 	x != ','))
699 
700 	if (isalnum(c) || c == ':' || c == '_') {
701 		do {
702 			*p++ = c;
703 			if ((unsigned)(p-buf) >= sizeof(buf)) {
704 				yyerror("string too long");
705 				return (findeol());
706 			}
707 			c = lgetc(0);
708 		} while (c != EOF && (allowed_in_string(c)));
709 		lungetc(c);
710 		*p = '\0';
711 		token = lookup(buf);
712 		if (token == STRING) {
713 			yylval.v.string = strdup(buf);
714 			if (yylval.v.string == NULL)
715 				err(1, "yylex: strdup");
716 		}
717 		return (token);
718 	}
719 	if (c == '\n') {
720 		yylval.lineno = file->lineno;
721 		file->lineno++;
722 	}
723 	if (c == EOF)
724 		return (0);
725 	return (c);
726 }
727 
728 int
729 check_file_secrecy(int fd, const char *fname)
730 {
731 	struct stat st;
732 
733 	if (fstat(fd, &st)) {
734 		log_warn("cannot stat %s", fname);
735 		return (-1);
736 	}
737 	if (st.st_uid != 0 && st.st_uid != getuid()) {
738 		log_warnx("%s: owner not root or current user", fname);
739 		return (-1);
740 	}
741 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
742 		log_warnx("%s: group writable or world read/writable", fname);
743 		return (-1);
744 	}
745 	return (0);
746 }
747 
748 struct file *
749 newfile(const char *name, int secret)
750 {
751 	struct file *nfile;
752 
753 	nfile = calloc(1, sizeof(struct file));
754 	if (nfile == NULL) {
755 		log_warn("calloc");
756 		return (NULL);
757 	}
758 	nfile->name = strdup(name);
759 	if (nfile->name == NULL) {
760 		log_warn("strdup");
761 		free(nfile);
762 		return (NULL);
763 	}
764 	nfile->stream = fopen(nfile->name, "r");
765 	if (nfile->stream == NULL) {
766 		/* no warning, we don't require a conf file */
767 		free(nfile->name);
768 		free(nfile);
769 		return (NULL);
770 	} else if (secret &&
771 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
772 		fclose(nfile->stream);
773 		free(nfile->name);
774 		free(nfile);
775 		return (NULL);
776 	}
777 	nfile->lineno = 1;
778 	return (nfile);
779 }
780 
781 static void
782 closefile(struct file *xfile)
783 {
784 	fclose(xfile->stream);
785 	free(xfile->name);
786 	free(xfile);
787 }
788 
789 static void
790 add_default_server(void)
791 {
792 	new_srv = conf_new_server(D_SITENAME);
793 	log_debug("%s: adding default server %s", __func__, D_SITENAME);
794 }
795 
796 int
797 parse_config(const char *filename, struct gotwebd *env)
798 {
799 	struct sym *sym, *next;
800 
801 	if (config_init(env) == -1)
802 		fatalx("failed to initialize configuration");
803 
804 	gotwebd = env;
805 
806 	file = newfile(filename, 0);
807 	if (file == NULL) {
808 		add_default_server();
809 		sockets_parse_sockets(env);
810 		/* just return, as we don't require a conf file */
811 		return (0);
812 	}
813 
814 	yyparse();
815 	errors = file->errors;
816 	closefile(file);
817 
818 	/* Free macros and check which have not been used. */
819 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
820 		if ((gotwebd->gotwebd_verbose > 1) && !sym->used)
821 			fprintf(stderr, "warning: macro '%s' not used\n",
822 			    sym->nam);
823 		if (!sym->persist) {
824 			free(sym->nam);
825 			free(sym->val);
826 			TAILQ_REMOVE(&symhead, sym, entry);
827 			free(sym);
828 		}
829 	}
830 
831 	if (errors)
832 		return (-1);
833 
834 	/* just add default server if no config specified */
835 	if (gotwebd->server_cnt == 0)
836 		add_default_server();
837 
838 	/* setup our listening sockets */
839 	sockets_parse_sockets(env);
840 
841 	return (0);
842 }
843 
844 struct server *
845 conf_new_server(const char *name)
846 {
847 	struct server *srv = NULL;
848 
849 	srv = calloc(1, sizeof(*srv));
850 	if (srv == NULL)
851 		fatalx("%s: calloc", __func__);
852 
853 	n = strlcpy(srv->name, name, sizeof(srv->name));
854 	if (n >= sizeof(srv->name))
855 		fatalx("%s: strlcpy", __func__);
856 	n = snprintf(srv->unix_socket_name,
857 	    sizeof(srv->unix_socket_name), "%s%s", D_HTTPD_CHROOT,
858 	    D_UNIX_SOCKET);
859 	if (n < 0 || (size_t)n >= sizeof(srv->unix_socket_name))
860 		fatalx("%s: snprintf", __func__);
861 	n = strlcpy(srv->repos_path, D_GOTPATH,
862 	    sizeof(srv->repos_path));
863 	if (n >= sizeof(srv->repos_path))
864 		fatalx("%s: strlcpy", __func__);
865 	n = strlcpy(srv->site_name, D_SITENAME,
866 	    sizeof(srv->site_name));
867 	if (n >= sizeof(srv->site_name))
868 		fatalx("%s: strlcpy", __func__);
869 	n = strlcpy(srv->site_owner, D_SITEOWNER,
870 	    sizeof(srv->site_owner));
871 	if (n >= sizeof(srv->site_owner))
872 		fatalx("%s: strlcpy", __func__);
873 	n = strlcpy(srv->site_link, D_SITELINK,
874 	    sizeof(srv->site_link));
875 	if (n >= sizeof(srv->site_link))
876 		fatalx("%s: strlcpy", __func__);
877 	n = strlcpy(srv->logo, D_GOTLOGO,
878 	    sizeof(srv->logo));
879 	if (n >= sizeof(srv->logo))
880 		fatalx("%s: strlcpy", __func__);
881 	n = strlcpy(srv->logo_url, D_GOTURL, sizeof(srv->logo_url));
882 	if (n >= sizeof(srv->logo_url))
883 		fatalx("%s: strlcpy", __func__);
884 	n = strlcpy(srv->custom_css, D_GOTWEBCSS, sizeof(srv->custom_css));
885 	if (n >= sizeof(srv->custom_css))
886 		fatalx("%s: strlcpy", __func__);
887 
888 	srv->show_site_owner = D_SHOWSOWNER;
889 	srv->show_repo_owner = D_SHOWROWNER;
890 	srv->show_repo_age = D_SHOWAGE;
891 	srv->show_repo_description = D_SHOWDESC;
892 	srv->show_repo_cloneurl = D_SHOWURL;
893 	srv->respect_exportok = D_RESPECTEXPORTOK;
894 
895 	srv->max_repos_display = D_MAXREPODISP;
896 	srv->max_commits_display = D_MAXCOMMITDISP;
897 	srv->max_repos = D_MAXREPO;
898 
899 	srv->unix_socket = 1;
900 	srv->fcgi_socket = 0;
901 
902 	TAILQ_INIT(&srv->al);
903 	TAILQ_INSERT_TAIL(&gotwebd->servers, srv, entry);
904 	gotwebd->server_cnt++;
905 
906 	return srv;
907 };
908 
909 int
910 symset(const char *nam, const char *val, int persist)
911 {
912 	struct sym *sym;
913 
914 	TAILQ_FOREACH(sym, &symhead, entry) {
915 		if (strcmp(nam, sym->nam) == 0)
916 			break;
917 	}
918 
919 	if (sym != NULL) {
920 		if (sym->persist == 1)
921 			return (0);
922 		else {
923 			free(sym->nam);
924 			free(sym->val);
925 			TAILQ_REMOVE(&symhead, sym, entry);
926 			free(sym);
927 		}
928 	}
929 	sym = calloc(1, sizeof(*sym));
930 	if (sym == NULL)
931 		return (-1);
932 
933 	sym->nam = strdup(nam);
934 	if (sym->nam == NULL) {
935 		free(sym);
936 		return (-1);
937 	}
938 	sym->val = strdup(val);
939 	if (sym->val == NULL) {
940 		free(sym->nam);
941 		free(sym);
942 		return (-1);
943 	}
944 	sym->used = 0;
945 	sym->persist = persist;
946 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
947 	return (0);
948 }
949 
950 int
951 cmdline_symset(char *s)
952 {
953 	char *sym, *val;
954 	int ret;
955 
956 	val = strrchr(s, '=');
957 	if (val == NULL)
958 		return (-1);
959 
960 	sym = strndup(s, val - s);
961 	if (sym == NULL)
962 		fatal("%s: strndup", __func__);
963 
964 	ret = symset(sym, val + 1, 1);
965 	free(sym);
966 
967 	return (ret);
968 }
969 
970 char *
971 symget(const char *nam)
972 {
973 	struct sym *sym;
974 
975 	TAILQ_FOREACH(sym, &symhead, entry) {
976 		if (strcmp(nam, sym->nam) == 0) {
977 			sym->used = 1;
978 			return (sym->val);
979 		}
980 	}
981 	return (NULL);
982 }
983 
984 int
985 getservice(const char *n)
986 {
987 	struct servent *s;
988 	const char *errstr;
989 	long long llval;
990 
991 	llval = strtonum(n, 0, UINT16_MAX, &errstr);
992 	if (errstr) {
993 		s = getservbyname(n, "tcp");
994 		if (s == NULL)
995 			s = getservbyname(n, "udp");
996 		if (s == NULL)
997 			return (-1);
998 		return ntohs(s->s_port);
999 	}
1000 
1001 	return (unsigned short)llval;
1002 }
1003 
1004 struct address *
1005 host_v4(const char *s)
1006 {
1007 	struct in_addr ina;
1008 	struct sockaddr_in *sain;
1009 	struct address *h;
1010 
1011 	memset(&ina, 0, sizeof(ina));
1012 	if (inet_pton(AF_INET, s, &ina) != 1)
1013 		return (NULL);
1014 
1015 	if ((h = calloc(1, sizeof(*h))) == NULL)
1016 		fatal(__func__);
1017 	sain = (struct sockaddr_in *)&h->ss;
1018 	got_sockaddr_inet_init(sain, &ina);
1019 	if (sain->sin_addr.s_addr == INADDR_ANY)
1020 		h->prefixlen = 0; /* 0.0.0.0 address */
1021 	else
1022 		h->prefixlen = -1; /* host address */
1023 	return (h);
1024 }
1025 
1026 struct address *
1027 host_v6(const char *s)
1028 {
1029 	struct addrinfo hints, *res;
1030 	struct sockaddr_in6 *sa_in6, *ra;
1031 	struct address *h = NULL;
1032 
1033 	memset(&hints, 0, sizeof(hints));
1034 	hints.ai_family = AF_INET6;
1035 	hints.ai_socktype = SOCK_DGRAM; /* dummy */
1036 	hints.ai_flags = AI_NUMERICHOST;
1037 	if (getaddrinfo(s, "0", &hints, &res) == 0) {
1038 		if ((h = calloc(1, sizeof(*h))) == NULL)
1039 			fatal(__func__);
1040 		sa_in6 = (struct sockaddr_in6 *)&h->ss;
1041 		ra = (struct sockaddr_in6 *)res->ai_addr;
1042 		got_sockaddr_inet6_init(sa_in6, &ra->sin6_addr,
1043 		    ra->sin6_scope_id);
1044 		if (memcmp(&sa_in6->sin6_addr, &in6addr_any,
1045 		    sizeof(sa_in6->sin6_addr)) == 0)
1046 			h->prefixlen = 0; /* any address */
1047 		else
1048 			h->prefixlen = -1; /* host address */
1049 		freeaddrinfo(res);
1050 	}
1051 
1052 	return (h);
1053 }
1054 
1055 int
1056 host_dns(const char *s, struct server *new_srv, int max,
1057     in_port_t port, const char *ifname, int ipproto)
1058 {
1059 	struct addrinfo hints, *res0, *res;
1060 	int error, cnt = 0;
1061 	struct sockaddr_in *sain;
1062 	struct sockaddr_in6 *sin6;
1063 	struct address *h;
1064 
1065 	if ((cnt = host_if(s, new_srv, max, port, ifname, ipproto)) != 0)
1066 		return (cnt);
1067 
1068 	memset(&hints, 0, sizeof(hints));
1069 	hints.ai_family = PF_UNSPEC;
1070 	hints.ai_socktype = SOCK_DGRAM; /* DUMMY */
1071 	hints.ai_flags = AI_ADDRCONFIG;
1072 	error = getaddrinfo(s, NULL, &hints, &res0);
1073 	if (error == EAI_AGAIN || error == EAI_NODATA || error == EAI_NONAME)
1074 		return (0);
1075 	if (error) {
1076 		log_warnx("%s: could not parse \"%s\": %s", __func__, s,
1077 		    gai_strerror(error));
1078 		return (-1);
1079 	}
1080 
1081 	for (res = res0; res && cnt < max; res = res->ai_next) {
1082 		if (res->ai_family != AF_INET &&
1083 		    res->ai_family != AF_INET6)
1084 			continue;
1085 		if ((h = calloc(1, sizeof(*h))) == NULL)
1086 			fatal(__func__);
1087 
1088 		if (port)
1089 			h->port = port;
1090 		if (ifname != NULL) {
1091 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1092 			    sizeof(h->ifname)) {
1093 				log_warnx("%s: interface name truncated",
1094 				    __func__);
1095 				freeaddrinfo(res0);
1096 				free(h);
1097 				return (-1);
1098 			}
1099 		}
1100 		if (ipproto != -1)
1101 			h->ipproto = ipproto;
1102 		h->ss.ss_family = res->ai_family;
1103 		h->prefixlen = -1; /* host address */
1104 
1105 		if (res->ai_family == AF_INET) {
1106 			struct sockaddr_in *ra;
1107 			sain = (struct sockaddr_in *)&h->ss;
1108 			ra = (struct sockaddr_in *)res->ai_addr;
1109 			got_sockaddr_inet_init(sain, &ra->sin_addr);
1110 		} else {
1111 			struct sockaddr_in6 *ra;
1112 			sin6 = (struct sockaddr_in6 *)&h->ss;
1113 			ra = (struct sockaddr_in6 *)res->ai_addr;
1114 			got_sockaddr_inet6_init(sin6, &ra->sin6_addr, 0);
1115 		}
1116 
1117 		if (add_addr(new_srv, h))
1118 			return -1;
1119 		cnt++;
1120 	}
1121 	if (cnt == max && res) {
1122 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1123 		    s, max);
1124 	}
1125 	freeaddrinfo(res0);
1126 	return (cnt);
1127 }
1128 
1129 int
1130 host_if(const char *s, struct server *new_srv, int max,
1131     in_port_t port, const char *ifname, int ipproto)
1132 {
1133 	struct ifaddrs *ifap, *p;
1134 	struct sockaddr_in *sain;
1135 	struct sockaddr_in6 *sin6;
1136 	struct address *h;
1137 	int cnt = 0, af;
1138 
1139 	if (getifaddrs(&ifap) == -1)
1140 		fatal("getifaddrs");
1141 
1142 	/* First search for IPv4 addresses */
1143 	af = AF_INET;
1144 
1145  nextaf:
1146 	for (p = ifap; p != NULL && cnt < max; p = p->ifa_next) {
1147 		if (p->ifa_addr == NULL ||
1148 		    p->ifa_addr->sa_family != af ||
1149 		    (strcmp(s, p->ifa_name) != 0 &&
1150 		    !is_if_in_group(p->ifa_name, s)))
1151 			continue;
1152 		if ((h = calloc(1, sizeof(*h))) == NULL)
1153 			fatal("calloc");
1154 
1155 		if (port)
1156 			h->port = port;
1157 		if (ifname != NULL) {
1158 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1159 			    sizeof(h->ifname)) {
1160 				log_warnx("%s: interface name truncated",
1161 				    __func__);
1162 				free(h);
1163 				freeifaddrs(ifap);
1164 				return (-1);
1165 			}
1166 		}
1167 		if (ipproto != -1)
1168 			h->ipproto = ipproto;
1169 		h->ss.ss_family = af;
1170 		h->prefixlen = -1; /* host address */
1171 
1172 		if (af == AF_INET) {
1173 			struct sockaddr_in *ra;
1174 			sain = (struct sockaddr_in *)&h->ss;
1175 			ra = (struct sockaddr_in *)p->ifa_addr;
1176 			got_sockaddr_inet_init(sain, &ra->sin_addr);
1177 		} else {
1178 			struct sockaddr_in6 *ra;
1179 			sin6 = (struct sockaddr_in6 *)&h->ss;
1180 			ra = (struct sockaddr_in6 *)p->ifa_addr;
1181 			got_sockaddr_inet6_init(sin6, &ra->sin6_addr,
1182 			    ra->sin6_scope_id);
1183 		}
1184 
1185 		if (add_addr(new_srv, h))
1186 			return -1;
1187 		cnt++;
1188 	}
1189 	if (af == AF_INET) {
1190 		/* Next search for IPv6 addresses */
1191 		af = AF_INET6;
1192 		goto nextaf;
1193 	}
1194 
1195 	if (cnt > max) {
1196 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1197 		    s, max);
1198 	}
1199 	freeifaddrs(ifap);
1200 	return (cnt);
1201 }
1202 
1203 int
1204 host(const char *s, struct server *new_srv, int max,
1205     in_port_t port, const char *ifname, int ipproto)
1206 {
1207 	struct address *h;
1208 
1209 	h = host_v4(s);
1210 
1211 	/* IPv6 address? */
1212 	if (h == NULL)
1213 		h = host_v6(s);
1214 
1215 	if (h != NULL) {
1216 		if (port)
1217 			h->port = port;
1218 		if (ifname != NULL) {
1219 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1220 			    sizeof(h->ifname)) {
1221 				log_warnx("%s: interface name truncated",
1222 				    __func__);
1223 				free(h);
1224 				return (-1);
1225 			}
1226 		}
1227 		if (ipproto != -1)
1228 			h->ipproto = ipproto;
1229 
1230 		if (add_addr(new_srv, h))
1231 			return -1;
1232 		return (1);
1233 	}
1234 
1235 	return (host_dns(s, new_srv, max, port, ifname, ipproto));
1236 }
1237 
1238 int
1239 is_if_in_group(const char *ifname, const char *groupname)
1240 {
1241 	unsigned int len;
1242 	struct ifgroupreq ifgr;
1243 	struct ifg_req *ifg;
1244 	int s;
1245 	int ret = 0;
1246 
1247 	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
1248 		err(1, "socket");
1249 
1250 	memset(&ifgr, 0, sizeof(ifgr));
1251 	if (strlcpy(ifgr.ifgr_name, ifname, IFNAMSIZ) >= IFNAMSIZ)
1252 		err(1, "IFNAMSIZ");
1253 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1) {
1254 		if (errno == EINVAL || errno == ENOTTY)
1255 			goto end;
1256 		err(1, "SIOCGIFGROUP");
1257 	}
1258 
1259 	len = ifgr.ifgr_len;
1260 	ifgr.ifgr_groups = calloc(len / sizeof(struct ifg_req),
1261 	    sizeof(struct ifg_req));
1262 	if (ifgr.ifgr_groups == NULL)
1263 		err(1, "getifgroups");
1264 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1)
1265 		err(1, "SIOCGIFGROUP");
1266 
1267 	ifg = ifgr.ifgr_groups;
1268 	for (; ifg && len >= sizeof(struct ifg_req); ifg++) {
1269 		len -= sizeof(struct ifg_req);
1270 		if (strcmp(ifg->ifgrq_group, groupname) == 0) {
1271 			ret = 1;
1272 			break;
1273 		}
1274 	}
1275 	free(ifgr.ifgr_groups);
1276 
1277 end:
1278 	close(s);
1279 	return (ret);
1280 }
1281 
1282 int
1283 get_addrs(const char *addr, struct server *new_srv, in_port_t port)
1284 {
1285 	if (strcmp("", addr) == 0) {
1286 		if (host("127.0.0.1", new_srv, 1, port, "127.0.0.1",
1287 		    -1) <= 0) {
1288 			yyerror("invalid listen ip: %s",
1289 			    "127.0.0.1");
1290 			return (-1);
1291 		}
1292 		if (host("::1", new_srv, 1, port, "::1", -1) <= 0) {
1293 			yyerror("invalid listen ip: %s", "::1");
1294 			return (-1);
1295 		}
1296 	} else {
1297 		if (host(addr, new_srv, GOTWEBD_MAXIFACE, port, addr,
1298 		    -1) <= 0) {
1299 			yyerror("invalid listen ip: %s", addr);
1300 			return (-1);
1301 		}
1302 	}
1303 	return (0);
1304 }
1305 
1306 int
1307 addr_dup_check(struct addresslist *al, struct address *h, const char *new_srv,
1308     const char *other_srv)
1309 {
1310 	struct address *a;
1311 	void *ia;
1312 	char buf[INET6_ADDRSTRLEN];
1313 	const char *addrstr;
1314 
1315 	TAILQ_FOREACH(a, al, entry) {
1316 		if (memcmp(&a->ss, &h->ss, sizeof(h->ss)) != 0 ||
1317 		    a->port != h->port)
1318 			continue;
1319 
1320 		switch (h->ss.ss_family) {
1321 		case AF_INET:
1322 			ia = &((struct sockaddr_in *)(&h->ss))->sin_addr;
1323 			break;
1324 		case AF_INET6:
1325 			ia = &((struct sockaddr_in6 *)(&h->ss))->sin6_addr;
1326 			break;
1327 		default:
1328 			yyerror("unknown address family: %d", h->ss.ss_family);
1329 			return -1;
1330 		}
1331 		addrstr = inet_ntop(h->ss.ss_family, ia, buf, sizeof(buf));
1332 		if (addrstr) {
1333 			if (other_srv) {
1334 				yyerror("server %s: duplicate fcgi listen "
1335 				    "address %s:%d, already used by server %s",
1336 				    new_srv, addrstr, h->port, other_srv);
1337 			} else {
1338 				log_warnx("server: %s: duplicate fcgi listen "
1339 				    "address %s:%d", new_srv, addrstr, h->port);
1340 			}
1341 		} else {
1342 			if (other_srv) {
1343 				yyerror("server: %s: duplicate fcgi listen "
1344 				    "address, already used by server %s",
1345 				    new_srv, other_srv);
1346 			} else {
1347 				log_warnx("server %s: duplicate fcgi listen "
1348 				    "address", new_srv);
1349 			}
1350 		}
1351 
1352 		return -1;
1353 	}
1354 
1355 	return 0;
1356 }
1357 
1358 int
1359 add_addr(struct server *new_srv, struct address *h)
1360 {
1361 	struct server *srv;
1362 
1363 	/* Address cannot be shared between different servers. */
1364 	TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
1365 		if (srv == new_srv)
1366 			continue;
1367 		if (addr_dup_check(&srv->al, h, new_srv->name, srv->name))
1368 			return -1;
1369 	}
1370 
1371 	/* Tolerate duplicate address lines within the scope of a server. */
1372 	if (addr_dup_check(&new_srv->al, h, NULL, NULL) == 0)
1373 		TAILQ_INSERT_TAIL(&new_srv->al, h, entry);
1374 	else
1375 		free(h);
1376 
1377 	return 0;
1378 }