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/socket.h>
27 #include <sys/stat.h>
28 
29 #include <net/if.h>
30 #include <netinet/in.h>
31 
32 #include <arpa/inet.h>
33 
34 #include <ctype.h>
35 #include <err.h>
36 #include <errno.h>
37 #include <event.h>
38 #include <ifaddrs.h>
39 #include <limits.h>
40 #include <netdb.h>
41 #include <stdarg.h>
42 #include <stdlib.h>
43 #include <stdio.h>
44 #include <string.h>
45 #include <syslog.h>
46 #include <tls.h>
47 #include <unistd.h>
48 
49 #include "proc.h"
50 #include "gotwebd.h"
51 #include "got_compat.h"
52 
53 TAILQ_HEAD(files, file)		 files = TAILQ_HEAD_INITIALIZER(files);
54 static struct file {
55 	TAILQ_ENTRY(file)	 entry;
56 	FILE			*stream;
57 	char			*name;
58 	int			 lineno;
59 	int			 errors;
60 } *file;
61 struct file	*newfile(const char *, int);
62 static void	 closefile(struct file *);
63 int		 check_file_secrecy(int, const char *);
64 int		 yyparse(void);
65 int		 yylex(void);
66 int		 yyerror(const char *, ...)
67     __attribute__((__format__ (printf, 1, 2)))
68     __attribute__((__nonnull__ (1)));
69 int		 kw_cmp(const void *, const void *);
70 int		 lookup(char *);
71 int		 lgetc(int);
72 int		 lungetc(int);
73 int		 findeol(void);
74 
75 TAILQ_HEAD(symhead, sym)	 symhead = TAILQ_HEAD_INITIALIZER(symhead);
76 struct sym {
77 	TAILQ_ENTRY(sym)	 entry;
78 	int			 used;
79 	int			 persist;
80 	char			*nam;
81 	char			*val;
82 };
83 
84 int	 symset(const char *, const char *, int);
85 char	*symget(const char *);
86 
87 static int		 errors;
88 
89 static struct gotwebd		*gotwebd;
90 static struct server		*new_srv;
91 static struct server		*conf_new_server(const char *);
92 int				 getservice(const char *);
93 int				 n;
94 
95 int		 get_addrs(const char *, struct addresslist *, in_port_t);
96 struct address	*host_v4(const char *);
97 struct address	*host_v6(const char *);
98 int		 host_dns(const char *, struct addresslist *,
99 		    int, in_port_t, const char *, int);
100 int		 host_if(const char *, struct addresslist *,
101 		    int, in_port_t, const char *, int);
102 int		 host(const char *, struct addresslist *,
103 		    int, in_port_t, const char *, int);
104 int		 is_if_in_group(const char *, const char *);
105 
106 typedef struct {
107 	union {
108 		long long	 number;
109 		char		*string;
110 		in_port_t	 port;
111 	} v;
112 	int lineno;
113 } YYSTYPE;
114 
115 %}
116 
117 %token	BIND INTERFACE WWW_PATH MAX_REPOS SITE_NAME SITE_OWNER SITE_LINK LOGO
118 %token	LOGO_URL SHOW_REPO_OWNER SHOW_REPO_AGE SHOW_REPO_DESCRIPTION
119 %token	MAX_REPOS_DISPLAY REPOS_PATH MAX_COMMITS_DISPLAY ON ERROR
120 %token	SHOW_SITE_OWNER SHOW_REPO_CLONEURL PORT PREFORK FCGI_SOCKET
121 %token	UNIX_SOCKET UNIX_SOCKET_NAME SERVER CHROOT CUSTOM_CSS
122 
123 %token	<v.string>	STRING
124 %type	<v.port>	fcgiport
125 %token	<v.number>	NUMBER
126 %type	<v.number>	boolean
127 
128 %%
129 
130 grammar		:
131 		| grammar '\n'
132 		| grammar main '\n'
133 		| grammar server '\n'
134 		;
135 
136 boolean		: STRING {
137 			if (strcasecmp($1, "1") == 0 ||
138 			    strcasecmp($1, "yes") == 0 ||
139 			    strcasecmp($1, "on") == 0)
140 				$$ = 1;
141 			else if (strcasecmp($1, "0") == 0 ||
142 			    strcasecmp($1, "off") == 0 ||
143 			    strcasecmp($1, "no") == 0)
144 				$$ = 0;
145 			else {
146 				yyerror("invalid boolean value '%s'", $1);
147 				free($1);
148 				YYERROR;
149 			}
150 			free($1);
151 		}
152 		| ON { $$ = 1; }
153 		| NUMBER { $$ = $1; }
154 		;
155 
156 fcgiport	: NUMBER {
157 			if ($1 <= 0 || $1 > (int)USHRT_MAX) {
158 				yyerror("invalid port: %lld", $1);
159 				YYERROR;
160 			}
161 			$$ = htons($1);
162 		}
163 		| STRING {
164 			int	 val;
165 
166 			if ((val = getservice($1)) == -1) {
167 				yyerror("invalid port: %s", $1);
168 				free($1);
169 				YYERROR;
170 			}
171 			free($1);
172 
173 			$$ = val;
174 		}
175 		;
176 
177 main		: PREFORK NUMBER {
178 			gotwebd->prefork_gotwebd = $2;
179 		}
180 		| CHROOT STRING {
181 			n = strlcpy(gotwebd->httpd_chroot, $2,
182 			    sizeof(gotwebd->httpd_chroot));
183 			if (n >= sizeof(gotwebd->httpd_chroot)) {
184 				yyerror("%s: httpd_chroot truncated", __func__);
185 				free($2);
186 				YYERROR;
187 			}
188 			free($2);
189 		}
190 		| FCGI_SOCKET boolean {
191 			gotwebd->fcgi_socket = $2;
192 		}
193 		| FCGI_SOCKET boolean  {
194 			gotwebd->fcgi_socket = $2;
195 		} '{' optnl socketopts4 '}'
196 		| UNIX_SOCKET boolean {
197 			gotwebd->unix_socket = $2;
198 		}
199 		| UNIX_SOCKET_NAME STRING {
200 			n = snprintf(gotwebd->unix_socket_name,
201 			    sizeof(gotwebd->unix_socket_name), "%s%s",
202 			    strlen(gotwebd->httpd_chroot) ?
203 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $2);
204 			if (n < 0) {
205 				yyerror("%s: unix_socket_name truncated",
206 				    __func__);
207 				free($2);
208 				YYERROR;
209 			}
210 			free($2);
211 		}
212 		;
213 
214 server		: SERVER STRING {
215 			struct server *srv;
216 
217 			TAILQ_FOREACH(srv, gotwebd->servers, entry) {
218 				if (strcmp(srv->name, $2) == 0) {
219 					yyerror("server name exists '%s'", $2);
220 					free($2);
221 					YYERROR;
222 				}
223 			}
224 
225 			new_srv = conf_new_server($2);
226 			if (new_srv->fcgi_socket)
227 				if (get_addrs(new_srv->fcgi_socket_bind,
228 				    new_srv->al,
229 				    new_srv->fcgi_socket_port) == -1) {
230 					yyerror("could not get tcp iface "
231 					    "addrs");
232 					YYERROR;
233 				}
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 			if (get_addrs(new_srv->fcgi_socket_bind,
253 			    new_srv->al, new_srv->fcgi_socket_port) == -1) {
254 				yyerror("could not get tcp iface addrs");
255 				YYERROR;
256 			}
257 		}
258 		;
259 
260 serveropts1	: REPOS_PATH STRING {
261 			n = strlcpy(new_srv->repos_path, $2,
262 			    sizeof(new_srv->repos_path));
263 			if (n >= sizeof(new_srv->repos_path)) {
264 				yyerror("%s: repos_path truncated", __func__);
265 				free($2);
266 				YYERROR;
267 			}
268 			free($2);
269 		}
270 		| SITE_NAME STRING {
271 			n = strlcpy(new_srv->site_name, $2,
272 			    sizeof(new_srv->site_name));
273 			if (n >= sizeof(new_srv->site_name)) {
274 				yyerror("%s: site_name truncated", __func__);
275 				free($2);
276 				YYERROR;
277 			}
278 			free($2);
279 		}
280 		| SITE_OWNER STRING {
281 			n = strlcpy(new_srv->site_owner, $2,
282 			    sizeof(new_srv->site_owner));
283 			if (n >= sizeof(new_srv->site_owner)) {
284 				yyerror("%s: site_owner truncated", __func__);
285 				free($2);
286 				YYERROR;
287 			}
288 			free($2);
289 		}
290 		| SITE_LINK STRING {
291 			n = strlcpy(new_srv->site_link, $2,
292 			    sizeof(new_srv->site_link));
293 			if (n >= sizeof(new_srv->site_link)) {
294 				yyerror("%s: site_link truncated", __func__);
295 				free($2);
296 				YYERROR;
297 			}
298 			free($2);
299 		}
300 		| LOGO STRING {
301 			n = strlcpy(new_srv->logo, $2, sizeof(new_srv->logo));
302 			if (n >= sizeof(new_srv->logo)) {
303 				yyerror("%s: logo truncated", __func__);
304 				free($2);
305 				YYERROR;
306 			}
307 			free($2);
308 		}
309 		| LOGO_URL STRING {
310 			n = strlcpy(new_srv->logo_url, $2,
311 			    sizeof(new_srv->logo_url));
312 			if (n >= sizeof(new_srv->logo_url)) {
313 				yyerror("%s: logo_url truncated", __func__);
314 				free($2);
315 				YYERROR;
316 			}
317 			free($2);
318 		}
319 		| CUSTOM_CSS STRING {
320 			n = strlcpy(new_srv->custom_css, $2,
321 			    sizeof(new_srv->custom_css));
322 			if (n >= sizeof(new_srv->custom_css)) {
323 				yyerror("%s: custom_css truncated", __func__);
324 				free($2);
325 				YYERROR;
326 			}
327 			free($2);
328 		}
329 		| MAX_REPOS NUMBER {
330 			if ($2 > 0)
331 				new_srv->max_repos = $2;
332 		}
333 		| SHOW_SITE_OWNER boolean {
334 			new_srv->show_site_owner = $2;
335 		}
336 		| SHOW_REPO_OWNER boolean {
337 			new_srv->show_repo_owner = $2;
338 		}
339 		| SHOW_REPO_AGE boolean {
340 			new_srv->show_repo_age = $2;
341 		}
342 		| SHOW_REPO_DESCRIPTION boolean {
343 			new_srv->show_repo_description = $2;
344 		}
345 		| SHOW_REPO_CLONEURL boolean {
346 			new_srv->show_repo_cloneurl = $2;
347 		}
348 		| MAX_REPOS_DISPLAY NUMBER {
349 				new_srv->max_repos_display = $2;
350 		}
351 		| MAX_COMMITS_DISPLAY NUMBER {
352 			if ($2 > 0)
353 				new_srv->max_commits_display = $2;
354 		}
355 		| FCGI_SOCKET boolean {
356 			new_srv->fcgi_socket = $2;
357 		}
358 		| FCGI_SOCKET boolean  {
359 			new_srv->fcgi_socket = $2;
360 		} '{' optnl socketopts2 '}'
361 		| UNIX_SOCKET boolean {
362 			new_srv->unix_socket = $2;
363 		}
364 		| UNIX_SOCKET_NAME STRING {
365 			n = snprintf(new_srv->unix_socket_name,
366 			    sizeof(new_srv->unix_socket_name), "%s%s",
367 			    strlen(gotwebd->httpd_chroot) ?
368 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $2);
369 			if (n < 0) {
370 				yyerror("%s: unix_socket_name truncated",
371 				    __func__);
372 				free($2);
373 				YYERROR;
374 			}
375 			free($2);
376 		}
377 		;
378 
379 serveropts2	: serveropts2 serveropts1 nl
380 		| serveropts1 optnl
381 		;
382 
383 socketopts1	: BIND INTERFACE STRING {
384 			n = strlcpy(new_srv->fcgi_socket_bind, $3,
385 			    sizeof(new_srv->fcgi_socket_bind));
386 			if (n >= sizeof(new_srv->fcgi_socket_bind)) {
387 				yyerror("%s: fcgi_socket_bind truncated",
388 				    __func__);
389 				free($3);
390 				YYERROR;
391 			}
392 			free($3);
393 		}
394 		| PORT fcgiport {
395 			struct server	*srv;
396 
397 			TAILQ_FOREACH(srv, gotwebd->servers, entry) {
398 				if (srv->fcgi_socket_port == $2) {
399 					yyerror("port already assigned");
400 					YYERROR;
401 				}
402 			}
403 			new_srv->fcgi_socket_port = $2;
404 		}
405 		;
406 
407 socketopts2	: socketopts2 socketopts1 nl
408 		| socketopts1 optnl
409 		;
410 
411 socketopts3	: BIND INTERFACE STRING {
412 			n = strlcpy(gotwebd->fcgi_socket_bind, $3,
413 			    sizeof(gotwebd->fcgi_socket_bind));
414 			if (n >= sizeof(gotwebd->fcgi_socket_bind)) {
415 				yyerror("%s: fcgi_socket_bind truncated",
416 				    __func__);
417 				free($3);
418 				YYERROR;
419 			}
420 			free($3);
421 		}
422 		| PORT fcgiport {
423 			gotwebd->fcgi_socket_port = $2;
424 		}
425 		;
426 
427 socketopts4	: socketopts4 socketopts3 nl
428 		| socketopts3 optnl
429 		;
430 
431 nl		: '\n' optnl
432 		;
433 
434 optnl		: '\n' optnl		/* zero or more newlines */
435 		| /* empty */
436 		;
437 
438 %%
439 
440 struct keywords {
441 	const char	*k_name;
442 	int		 k_val;
443 };
444 
445 int
446 yyerror(const char *fmt, ...)
447 {
448 	va_list ap;
449 	char *msg;
450 
451 	file->errors++;
452 	va_start(ap, fmt);
453 	if (vasprintf(&msg, fmt, ap) == -1)
454 		fatalx("yyerror vasprintf");
455 	va_end(ap);
456 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
457 	free(msg);
458 	return (0);
459 }
460 
461 int
462 kw_cmp(const void *k, const void *e)
463 {
464 	return (strcmp(k, ((const struct keywords *)e)->k_name));
465 }
466 
467 int
468 lookup(char *s)
469 {
470 	/* This has to be sorted always. */
471 	static const struct keywords keywords[] = {
472 		{ "bind",			BIND },
473 		{ "chroot",			CHROOT },
474 		{ "custom_css",			CUSTOM_CSS },
475 		{ "fcgi_socket",		FCGI_SOCKET },
476 		{ "interface",			INTERFACE },
477 		{ "logo",			LOGO },
478 		{ "logo_url"	,		LOGO_URL },
479 		{ "max_commits_display",	MAX_COMMITS_DISPLAY },
480 		{ "max_repos",			MAX_REPOS },
481 		{ "max_repos_display",		MAX_REPOS_DISPLAY },
482 		{ "port",			PORT },
483 		{ "prefork",			PREFORK },
484 		{ "repos_path",			REPOS_PATH },
485 		{ "server",			SERVER },
486 		{ "show_repo_age",		SHOW_REPO_AGE },
487 		{ "show_repo_cloneurl",		SHOW_REPO_CLONEURL },
488 		{ "show_repo_description",	SHOW_REPO_DESCRIPTION },
489 		{ "show_repo_owner",		SHOW_REPO_OWNER },
490 		{ "show_site_owner",		SHOW_SITE_OWNER },
491 		{ "site_link",			SITE_LINK },
492 		{ "site_name",			SITE_NAME },
493 		{ "site_owner",			SITE_OWNER },
494 		{ "unix_socket",		UNIX_SOCKET },
495 		{ "unix_socket_name",		UNIX_SOCKET_NAME },
496 	};
497 	const struct keywords *p;
498 
499 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
500 	    sizeof(keywords[0]), kw_cmp);
501 
502 	if (p)
503 		return (p->k_val);
504 	else
505 		return (STRING);
506 }
507 
508 #define MAXPUSHBACK	128
509 
510 unsigned char *parsebuf;
511 int parseindex;
512 unsigned char pushback_buffer[MAXPUSHBACK];
513 int pushback_index = 0;
514 
515 int
516 lgetc(int quotec)
517 {
518 	int c, next;
519 
520 	if (parsebuf) {
521 		/* Read character from the parsebuffer instead of input. */
522 		if (parseindex >= 0) {
523 			c = parsebuf[parseindex++];
524 			if (c != '\0')
525 				return (c);
526 			parsebuf = NULL;
527 		} else
528 			parseindex++;
529 	}
530 
531 	if (pushback_index)
532 		return (pushback_buffer[--pushback_index]);
533 
534 	if (quotec) {
535 		c = getc(file->stream);
536 		if (c == EOF)
537 			yyerror("reached end of file while parsing "
538 			    "quoted string");
539 		return (c);
540 	}
541 
542 	c = getc(file->stream);
543 	while (c == '\\') {
544 		next = getc(file->stream);
545 		if (next != '\n') {
546 			c = next;
547 			break;
548 		}
549 		yylval.lineno = file->lineno;
550 		file->lineno++;
551 		c = getc(file->stream);
552 	}
553 
554 	return (c);
555 }
556 
557 int
558 lungetc(int c)
559 {
560 	if (c == EOF)
561 		return (EOF);
562 	if (parsebuf) {
563 		parseindex--;
564 		if (parseindex >= 0)
565 			return (c);
566 	}
567 	if (pushback_index < MAXPUSHBACK-1)
568 		return (pushback_buffer[pushback_index++] = c);
569 	else
570 		return (EOF);
571 }
572 
573 int
574 findeol(void)
575 {
576 	int c;
577 
578 	parsebuf = NULL;
579 
580 	/* Skip to either EOF or the first real EOL. */
581 	while (1) {
582 		if (pushback_index)
583 			c = pushback_buffer[--pushback_index];
584 		else
585 			c = lgetc(0);
586 		if (c == '\n') {
587 			file->lineno++;
588 			break;
589 		}
590 		if (c == EOF)
591 			break;
592 	}
593 	return (ERROR);
594 }
595 
596 int
597 yylex(void)
598 {
599 	unsigned char buf[8096];
600 	unsigned char *p, *val;
601 	int quotec, next, c;
602 	int token;
603 
604 top:
605 	p = buf;
606 	c = lgetc(0);
607 	while (c == ' ' || c == '\t')
608 		c = lgetc(0); /* nothing */
609 
610 	yylval.lineno = file->lineno;
611 	if (c == '#') {
612 		c = lgetc(0);
613 		while (c != '\n' && c != EOF)
614 			c = lgetc(0); /* nothing */
615 	}
616 	if (c == '$' && parsebuf == NULL) {
617 		while (1) {
618 			c = lgetc(0);
619 			if (c == EOF)
620 				return (0);
621 
622 			if (p + 1 >= buf + sizeof(buf) - 1) {
623 				yyerror("string too long");
624 				return (findeol());
625 			}
626 			if (isalnum(c) || c == '_') {
627 				*p++ = c;
628 				continue;
629 			}
630 			*p = '\0';
631 			lungetc(c);
632 			break;
633 		}
634 		val = symget(buf);
635 		if (val == NULL) {
636 			yyerror("macro '%s' not defined", buf);
637 			return (findeol());
638 		}
639 		parsebuf = val;
640 		parseindex = 0;
641 		goto top;
642 	}
643 
644 	switch (c) {
645 	case '\'':
646 	case '"':
647 		quotec = c;
648 		while (1) {
649 			c = lgetc(quotec);
650 			if (c == EOF)
651 				return (0);
652 			if (c == '\n') {
653 				file->lineno++;
654 				continue;
655 			} else if (c == '\\') {
656 				next = lgetc(quotec);
657 				if (next == EOF)
658 					return (0);
659 				if (next == quotec || c == ' ' || c == '\t')
660 					c = next;
661 				else if (next == '\n') {
662 					file->lineno++;
663 					continue;
664 				} else
665 					lungetc(next);
666 			} else if (c == quotec) {
667 				*p = '\0';
668 				break;
669 			} else if (c == '\0') {
670 				yyerror("syntax error");
671 				return (findeol());
672 			}
673 			if (p + 1 >= buf + sizeof(buf) - 1) {
674 				yyerror("string too long");
675 				return (findeol());
676 			}
677 			*p++ = c;
678 		}
679 		yylval.v.string = strdup(buf);
680 		if (yylval.v.string == NULL)
681 			err(1, "yylex: strdup");
682 		return (STRING);
683 	}
684 
685 #define allowed_to_end_number(x) \
686 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
687 
688 	if (c == '-' || isdigit(c)) {
689 		do {
690 			*p++ = c;
691 			if ((unsigned)(p-buf) >= sizeof(buf)) {
692 				yyerror("string too long");
693 				return (findeol());
694 			}
695 			c = lgetc(0);
696 		} while (c != EOF && isdigit(c));
697 		lungetc(c);
698 		if (p == buf + 1 && buf[0] == '-')
699 			goto nodigits;
700 		if (c == EOF || allowed_to_end_number(c)) {
701 			const char *errstr = NULL;
702 
703 			*p = '\0';
704 			yylval.v.number = strtonum(buf, LLONG_MIN,
705 			    LLONG_MAX, &errstr);
706 			if (errstr) {
707 				yyerror("\"%s\" invalid number: %s",
708 				    buf, errstr);
709 				return (findeol());
710 			}
711 			return (NUMBER);
712 		} else {
713 nodigits:
714 			while (p > buf + 1)
715 				lungetc(*--p);
716 			c = *--p;
717 			if (c == '-')
718 				return (c);
719 		}
720 	}
721 
722 #define allowed_in_string(x) \
723 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
724 	x != '{' && x != '}' && \
725 	x != '!' && x != '=' && x != '#' && \
726 	x != ','))
727 
728 	if (isalnum(c) || c == ':' || c == '_') {
729 		do {
730 			*p++ = c;
731 			if ((unsigned)(p-buf) >= sizeof(buf)) {
732 				yyerror("string too long");
733 				return (findeol());
734 			}
735 			c = lgetc(0);
736 		} while (c != EOF && (allowed_in_string(c)));
737 		lungetc(c);
738 		*p = '\0';
739 		token = lookup(buf);
740 		if (token == STRING) {
741 			yylval.v.string = strdup(buf);
742 			if (yylval.v.string == NULL)
743 				err(1, "yylex: strdup");
744 		}
745 		return (token);
746 	}
747 	if (c == '\n') {
748 		yylval.lineno = file->lineno;
749 		file->lineno++;
750 	}
751 	if (c == EOF)
752 		return (0);
753 	return (c);
754 }
755 
756 int
757 check_file_secrecy(int fd, const char *fname)
758 {
759 	struct stat st;
760 
761 	if (fstat(fd, &st)) {
762 		log_warn("cannot stat %s", fname);
763 		return (-1);
764 	}
765 	if (st.st_uid != 0 && st.st_uid != getuid()) {
766 		log_warnx("%s: owner not root or current user", fname);
767 		return (-1);
768 	}
769 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
770 		log_warnx("%s: group writable or world read/writable", fname);
771 		return (-1);
772 	}
773 	return (0);
774 }
775 
776 struct file *
777 newfile(const char *name, int secret)
778 {
779 	struct file *nfile;
780 
781 	nfile = calloc(1, sizeof(struct file));
782 	if (nfile == NULL) {
783 		log_warn("calloc");
784 		return (NULL);
785 	}
786 	nfile->name = strdup(name);
787 	if (nfile->name == NULL) {
788 		log_warn("strdup");
789 		free(nfile);
790 		return (NULL);
791 	}
792 	nfile->stream = fopen(nfile->name, "r");
793 	if (nfile->stream == NULL) {
794 		/* no warning, we don't require a conf file */
795 		free(nfile->name);
796 		free(nfile);
797 		return (NULL);
798 	} else if (secret &&
799 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
800 		fclose(nfile->stream);
801 		free(nfile->name);
802 		free(nfile);
803 		return (NULL);
804 	}
805 	nfile->lineno = 1;
806 	return (nfile);
807 }
808 
809 static void
810 closefile(struct file *xfile)
811 {
812 	fclose(xfile->stream);
813 	free(xfile->name);
814 	free(xfile);
815 }
816 
817 int
818 parse_config(const char *filename, struct gotwebd *env)
819 {
820 	struct sym *sym, *next;
821 
822 	file = newfile(filename, 0);
823 	if (file == NULL)
824 		/* just return, as we don't require a conf file */
825 		return (0);
826 
827 	if (config_init(env) == -1)
828 		fatalx("failed to initialize configuration");
829 
830 	gotwebd = env;
831 
832 	yyparse();
833 	errors = file->errors;
834 	closefile(file);
835 
836 	/* Free macros and check which have not been used. */
837 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
838 		if ((gotwebd->gotwebd_verbose > 1) && !sym->used)
839 			fprintf(stderr, "warning: macro '%s' not used\n",
840 			    sym->nam);
841 		if (!sym->persist) {
842 			free(sym->nam);
843 			free(sym->val);
844 			TAILQ_REMOVE(&symhead, sym, entry);
845 			free(sym);
846 		}
847 	}
848 
849 	if (errors)
850 		return (-1);
851 
852 	/* just add default server if no config specified */
853 	if (gotwebd->server_cnt == 0) {
854 		new_srv = conf_new_server(D_SITENAME);
855 		log_debug("%s: adding default server %s", __func__, D_SITENAME);
856 	}
857 
858 	/* setup our listening sockets */
859 	sockets_parse_sockets(env);
860 
861 	return (0);
862 }
863 
864 struct server *
865 conf_new_server(const char *name)
866 {
867 	struct server *srv = NULL;
868 	int val;
869 
870 	srv = calloc(1, sizeof(*srv));
871 	if (srv == NULL)
872 		fatalx("%s: calloc", __func__);
873 
874 	n = strlcpy(srv->name, name, sizeof(srv->name));
875 	if (n >= sizeof(srv->name))
876 		fatalx("%s: strlcpy", __func__);
877 	n = snprintf(srv->unix_socket_name,
878 	    sizeof(srv->unix_socket_name), "%s%s", D_HTTPD_CHROOT,
879 	    D_UNIX_SOCKET);
880 	if (n < 0)
881 		fatalx("%s: snprintf", __func__);
882 	n = strlcpy(srv->repos_path, D_GOTPATH,
883 	    sizeof(srv->repos_path));
884 	if (n >= sizeof(srv->repos_path))
885 		fatalx("%s: strlcpy", __func__);
886 	n = strlcpy(srv->site_name, D_SITENAME,
887 	    sizeof(srv->site_name));
888 	if (n >= sizeof(srv->site_name))
889 		fatalx("%s: strlcpy", __func__);
890 	n = strlcpy(srv->site_owner, D_SITEOWNER,
891 	    sizeof(srv->site_owner));
892 	if (n >= sizeof(srv->site_owner))
893 		fatalx("%s: strlcpy", __func__);
894 	n = strlcpy(srv->site_link, D_SITELINK,
895 	    sizeof(srv->site_link));
896 	if (n >= sizeof(srv->site_link))
897 		fatalx("%s: strlcpy", __func__);
898 	n = strlcpy(srv->logo, D_GOTLOGO,
899 	    sizeof(srv->logo));
900 	if (n >= sizeof(srv->logo))
901 		fatalx("%s: strlcpy", __func__);
902 	n = strlcpy(srv->logo_url, D_GOTURL, sizeof(srv->logo_url));
903 	if (n >= sizeof(srv->logo_url))
904 		fatalx("%s: strlcpy", __func__);
905 	n = strlcpy(srv->custom_css, D_GOTWEBCSS, sizeof(srv->custom_css));
906 	if (n >= sizeof(srv->custom_css))
907 		fatalx("%s: strlcpy", __func__);
908 
909 	val = getservice(D_FCGI_PORT);
910 	srv->fcgi_socket_port = gotwebd->fcgi_socket_port ?
911 	    gotwebd->fcgi_socket_port: htons(val);
912 
913 	srv->show_site_owner = D_SHOWSOWNER;
914 	srv->show_repo_owner = D_SHOWROWNER;
915 	srv->show_repo_age = D_SHOWAGE;
916 	srv->show_repo_description = D_SHOWDESC;
917 	srv->show_repo_cloneurl = D_SHOWURL;
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 = gotwebd->fcgi_socket ? gotwebd->fcgi_socket : 0;
925 
926 	if ((srv->al = calloc(1, sizeof(*srv->al))) == NULL)
927 		fatalx("%s: calloc", __func__);
928 
929 	TAILQ_INIT(srv->al);
930 	TAILQ_INSERT_TAIL(gotwebd->servers, srv, entry);
931 	gotwebd->server_cnt++;
932 
933 	return srv;
934 };
935 
936 int
937 symset(const char *nam, const char *val, int persist)
938 {
939 	struct sym *sym;
940 
941 	TAILQ_FOREACH(sym, &symhead, entry) {
942 		if (strcmp(nam, sym->nam) == 0)
943 			break;
944 	}
945 
946 	if (sym != NULL) {
947 		if (sym->persist == 1)
948 			return (0);
949 		else {
950 			free(sym->nam);
951 			free(sym->val);
952 			TAILQ_REMOVE(&symhead, sym, entry);
953 			free(sym);
954 		}
955 	}
956 	sym = calloc(1, sizeof(*sym));
957 	if (sym == NULL)
958 		return (-1);
959 
960 	sym->nam = strdup(nam);
961 	if (sym->nam == NULL) {
962 		free(sym);
963 		return (-1);
964 	}
965 	sym->val = strdup(val);
966 	if (sym->val == NULL) {
967 		free(sym->nam);
968 		free(sym);
969 		return (-1);
970 	}
971 	sym->used = 0;
972 	sym->persist = persist;
973 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
974 	return (0);
975 }
976 
977 int
978 cmdline_symset(char *s)
979 {
980 	char *sym, *val;
981 	int ret;
982 	size_t len;
983 
984 	val = strrchr(s, '=');
985 	if (val == NULL)
986 		return (-1);
987 
988 	len = strlen(s) - strlen(val) + 1;
989 	sym = malloc(len);
990 	if (sym == NULL)
991 		fatal("%s: malloc", __func__);
992 
993 	memcpy(&sym, s, len);
994 
995 	ret = symset(sym, val + 1, 1);
996 	free(sym);
997 
998 	return (ret);
999 }
1000 
1001 char *
1002 symget(const char *nam)
1003 {
1004 	struct sym *sym;
1005 
1006 	TAILQ_FOREACH(sym, &symhead, entry) {
1007 		if (strcmp(nam, sym->nam) == 0) {
1008 			sym->used = 1;
1009 			return (sym->val);
1010 		}
1011 	}
1012 	return (NULL);
1013 }
1014 
1015 int
1016 getservice(const char *n)
1017 {
1018 	struct servent *s;
1019 	const char *errstr;
1020 	long long llval;
1021 
1022 	llval = strtonum(n, 0, UINT16_MAX, &errstr);
1023 	if (errstr) {
1024 		s = getservbyname(n, "tcp");
1025 		if (s == NULL)
1026 			s = getservbyname(n, "udp");
1027 		if (s == NULL)
1028 			return (-1);
1029 		return (s->s_port);
1030 	}
1031 
1032 	return (htons((unsigned short)llval));
1033 }
1034 
1035 struct address *
1036 host_v4(const char *s)
1037 {
1038 	struct in_addr ina;
1039 	struct sockaddr_in *sain;
1040 	struct address *h;
1041 
1042 	memset(&ina, 0, sizeof(ina));
1043 	if (inet_pton(AF_INET, s, &ina) != 1)
1044 		return (NULL);
1045 
1046 	if ((h = calloc(1, sizeof(*h))) == NULL)
1047 		fatal(__func__);
1048 	sain = (struct sockaddr_in *)&h->ss;
1049 /* TA:  Iffy... */
1050 #ifndef __linux__
1051 	sain->sin_len = sizeof(struct sockaddr_in);
1052 #endif
1053 	sain->sin_family = AF_INET;
1054 	sain->sin_addr.s_addr = ina.s_addr;
1055 	if (sain->sin_addr.s_addr == INADDR_ANY)
1056 		h->prefixlen = 0; /* 0.0.0.0 address */
1057 	else
1058 		h->prefixlen = -1; /* host address */
1059 	return (h);
1060 }
1061 
1062 struct address *
1063 host_v6(const char *s)
1064 {
1065 	struct addrinfo hints, *res;
1066 	struct sockaddr_in6 *sa_in6;
1067 	struct address *h = NULL;
1068 
1069 	memset(&hints, 0, sizeof(hints));
1070 	hints.ai_family = AF_INET6;
1071 	hints.ai_socktype = SOCK_DGRAM; /* dummy */
1072 	hints.ai_flags = AI_NUMERICHOST;
1073 	if (getaddrinfo(s, "0", &hints, &res) == 0) {
1074 		if ((h = calloc(1, sizeof(*h))) == NULL)
1075 			fatal(__func__);
1076 		sa_in6 = (struct sockaddr_in6 *)&h->ss;
1077 /* TA:  Iffy... */
1078 #ifndef __linux__
1079 		sa_in6->sin6_len = sizeof(struct sockaddr_in6);
1080 #endif
1081 		sa_in6->sin6_family = AF_INET6;
1082 		memcpy(&sa_in6->sin6_addr,
1083 		    &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr,
1084 		    sizeof(sa_in6->sin6_addr));
1085 		sa_in6->sin6_scope_id =
1086 		    ((struct sockaddr_in6 *)res->ai_addr)->sin6_scope_id;
1087 		if (memcmp(&sa_in6->sin6_addr, &in6addr_any,
1088 		    sizeof(sa_in6->sin6_addr)) == 0)
1089 			h->prefixlen = 0; /* any address */
1090 		else
1091 			h->prefixlen = -1; /* host address */
1092 		freeaddrinfo(res);
1093 	}
1094 
1095 	return (h);
1096 }
1097 
1098 int
1099 host_dns(const char *s, struct addresslist *al, int max,
1100     in_port_t port, const char *ifname, int ipproto)
1101 {
1102 	struct addrinfo hints, *res0, *res;
1103 	int error, cnt = 0;
1104 	struct sockaddr_in *sain;
1105 	struct sockaddr_in6 *sin6;
1106 	struct address *h;
1107 
1108 	if ((cnt = host_if(s, al, max, port, ifname, ipproto)) != 0)
1109 		return (cnt);
1110 
1111 	memset(&hints, 0, sizeof(hints));
1112 	hints.ai_family = PF_UNSPEC;
1113 	hints.ai_socktype = SOCK_DGRAM; /* DUMMY */
1114 	hints.ai_flags = AI_ADDRCONFIG;
1115 	error = getaddrinfo(s, NULL, &hints, &res0);
1116 	if (error == EAI_AGAIN || error == EAI_NODATA || error == EAI_NONAME)
1117 		return (0);
1118 	if (error) {
1119 		log_warnx("%s: could not parse \"%s\": %s", __func__, s,
1120 		    gai_strerror(error));
1121 		return (-1);
1122 	}
1123 
1124 	for (res = res0; res && cnt < max; res = res->ai_next) {
1125 		if (res->ai_family != AF_INET &&
1126 		    res->ai_family != AF_INET6)
1127 			continue;
1128 		if ((h = calloc(1, sizeof(*h))) == NULL)
1129 			fatal(__func__);
1130 
1131 		if (port)
1132 			h->port = port;
1133 		if (ifname != NULL) {
1134 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1135 			    sizeof(h->ifname)) {
1136 				log_warnx("%s: interface name truncated",
1137 				    __func__);
1138 				freeaddrinfo(res0);
1139 				free(h);
1140 				return (-1);
1141 			}
1142 		}
1143 		if (ipproto != -1)
1144 			h->ipproto = ipproto;
1145 		h->ss.ss_family = res->ai_family;
1146 		h->prefixlen = -1; /* host address */
1147 
1148 		if (res->ai_family == AF_INET) {
1149 			sain = (struct sockaddr_in *)&h->ss;
1150 /* TA:  Iffy... */
1151 #ifndef __linux__
1152 			sain->sin_len = sizeof(struct sockaddr_in);
1153 #endif
1154 			sain->sin_addr.s_addr = ((struct sockaddr_in *)
1155 			    res->ai_addr)->sin_addr.s_addr;
1156 		} else {
1157 			sin6 = (struct sockaddr_in6 *)&h->ss;
1158 /* TA:  Iffy... */
1159 #ifndef __linux__
1160 			sin6->sin6_len = sizeof(struct sockaddr_in6);
1161 #endif
1162 			memcpy(&sin6->sin6_addr, &((struct sockaddr_in6 *)
1163 			    res->ai_addr)->sin6_addr, sizeof(struct in6_addr));
1164 		}
1165 
1166 		TAILQ_INSERT_HEAD(al, h, entry);
1167 		cnt++;
1168 	}
1169 	if (cnt == max && res) {
1170 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1171 		    s, max);
1172 	}
1173 	freeaddrinfo(res0);
1174 	return (cnt);
1175 }
1176 
1177 int
1178 host_if(const char *s, struct addresslist *al, int max,
1179     in_port_t port, const char *ifname, int ipproto)
1180 {
1181 	struct ifaddrs *ifap, *p;
1182 	struct sockaddr_in *sain;
1183 	struct sockaddr_in6 *sin6;
1184 	struct address *h;
1185 	int cnt = 0, af;
1186 
1187 	if (getifaddrs(&ifap) == -1)
1188 		fatal("getifaddrs");
1189 
1190 	/* First search for IPv4 addresses */
1191 	af = AF_INET;
1192 
1193  nextaf:
1194 	for (p = ifap; p != NULL && cnt < max; p = p->ifa_next) {
1195 		if (p->ifa_addr == NULL ||
1196 		    p->ifa_addr->sa_family != af ||
1197 		    (strcmp(s, p->ifa_name) != 0 &&
1198 		    !is_if_in_group(p->ifa_name, s)))
1199 			continue;
1200 		if ((h = calloc(1, sizeof(*h))) == NULL)
1201 			fatal("calloc");
1202 
1203 		if (port)
1204 			h->port = port;
1205 		if (ifname != NULL) {
1206 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1207 			    sizeof(h->ifname)) {
1208 				log_warnx("%s: interface name truncated",
1209 				    __func__);
1210 				free(h);
1211 				freeifaddrs(ifap);
1212 				return (-1);
1213 			}
1214 		}
1215 		if (ipproto != -1)
1216 			h->ipproto = ipproto;
1217 		h->ss.ss_family = af;
1218 		h->prefixlen = -1; /* host address */
1219 
1220 		if (af == AF_INET) {
1221 			sain = (struct sockaddr_in *)&h->ss;
1222 /* TA:  Iffy... */
1223 #ifndef __linux__
1224 			sain->sin_len = sizeof(struct sockaddr_in);
1225 #endif
1226 			sain->sin_addr.s_addr = ((struct sockaddr_in *)
1227 			    p->ifa_addr)->sin_addr.s_addr;
1228 		} else {
1229 			sin6 = (struct sockaddr_in6 *)&h->ss;
1230 /* TA:  Iffy... */
1231 #ifndef __linux__
1232 			sin6->sin6_len = sizeof(struct sockaddr_in6);
1233 #endif
1234 			memcpy(&sin6->sin6_addr, &((struct sockaddr_in6 *)
1235 			    p->ifa_addr)->sin6_addr, sizeof(struct in6_addr));
1236 			sin6->sin6_scope_id = ((struct sockaddr_in6 *)
1237 			    p->ifa_addr)->sin6_scope_id;
1238 		}
1239 
1240 		TAILQ_INSERT_HEAD(al, h, entry);
1241 		cnt++;
1242 	}
1243 	if (af == AF_INET) {
1244 		/* Next search for IPv6 addresses */
1245 		af = AF_INET6;
1246 		goto nextaf;
1247 	}
1248 
1249 	if (cnt > max) {
1250 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1251 		    s, max);
1252 	}
1253 	freeifaddrs(ifap);
1254 	return (cnt);
1255 }
1256 
1257 int
1258 host(const char *s, struct addresslist *al, int max,
1259     in_port_t port, const char *ifname, int ipproto)
1260 {
1261 	struct address *h;
1262 
1263 	h = host_v4(s);
1264 
1265 	/* IPv6 address? */
1266 	if (h == NULL)
1267 		h = host_v6(s);
1268 
1269 	if (h != NULL) {
1270 		if (port)
1271 			h->port = port;
1272 		if (ifname != NULL) {
1273 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1274 			    sizeof(h->ifname)) {
1275 				log_warnx("%s: interface name truncated",
1276 				    __func__);
1277 				free(h);
1278 				return (-1);
1279 			}
1280 		}
1281 		if (ipproto != -1)
1282 			h->ipproto = ipproto;
1283 
1284 		TAILQ_INSERT_HEAD(al, h, entry);
1285 		return (1);
1286 	}
1287 
1288 	return (host_dns(s, al, max, port, ifname, ipproto));
1289 }
1290 
1291 int
1292 is_if_in_group(const char *ifname, const char *groupname)
1293 {
1294 /* TA: Check this... */
1295 #ifdef HAVE_STRUCT_IFGROUPREQ
1296 	unsigned int len;
1297 	struct ifgroupreq ifgr;
1298 	struct ifg_req *ifg;
1299 	int s;
1300 	int ret = 0;
1301 
1302 	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
1303 		err(1, "socket");
1304 
1305 	memset(&ifgr, 0, sizeof(ifgr));
1306 	if (strlcpy(ifgr.ifgr_name, ifname, IFNAMSIZ) >= IFNAMSIZ)
1307 		err(1, "IFNAMSIZ");
1308 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1) {
1309 		if (errno == EINVAL || errno == ENOTTY)
1310 			goto end;
1311 		err(1, "SIOCGIFGROUP");
1312 	}
1313 
1314 	len = ifgr.ifgr_len;
1315 	ifgr.ifgr_groups = calloc(len / sizeof(struct ifg_req),
1316 	    sizeof(struct ifg_req));
1317 	if (ifgr.ifgr_groups == NULL)
1318 		err(1, "getifgroups");
1319 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1)
1320 		err(1, "SIOCGIFGROUP");
1321 
1322 	ifg = ifgr.ifgr_groups;
1323 	for (; ifg && len >= sizeof(struct ifg_req); ifg++) {
1324 		len -= sizeof(struct ifg_req);
1325 		if (strcmp(ifg->ifgrq_group, groupname) == 0) {
1326 			ret = 1;
1327 			break;
1328 		}
1329 	}
1330 	free(ifgr.ifgr_groups);
1331 
1332 end:
1333 	close(s);
1334 	return (ret);
1335 #else
1336 	return (0);
1337 #endif
1338 }
1339 
1340 int
1341 get_addrs(const char *addr, struct addresslist *al, in_port_t port)
1342 {
1343 	if (strcmp("", addr) == 0) {
1344 		if (host("0.0.0.0", al, 1, port, "0.0.0.0", -1) <= 0) {
1345 			yyerror("invalid listen ip: %s",
1346 			    "0.0.0.0");
1347 			return (-1);
1348 		}
1349 		if (host("::", al, 1, port, "::", -1) <= 0) {
1350 			yyerror("invalid listen ip: %s", "::");
1351 			return (-1);
1352 		}
1353 	} else {
1354 		if (host(addr, al, GOTWEBD_MAXIFACE, port, addr,
1355 		    -1) <= 0) {
1356 			yyerror("invalid listen ip: %s", addr);
1357 			return (-1);
1358 		}
1359 	}
1360 	return (0);
1361 }