1 /*
2  * Copyright (c) 2022 Stefan Sperling <stsp@openbsd.org>
3  * Copyright (c) 2016-2019, 2020-2021 Tracey Emery <tracey@traceyemery.net>
4  * Copyright (c) 2004, 2005 Esben Norby <norby@openbsd.org>
5  * Copyright (c) 2004 Ryan McBride <mcbride@openbsd.org>
6  * Copyright (c) 2002, 2003, 2004 Henning Brauer <henning@openbsd.org>
7  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
8  * Copyright (c) 2001 Daniel Hartmeier.  All rights reserved.
9  * Copyright (c) 2001 Theo de Raadt.  All rights reserved.
10  *
11  * Permission to use, copy, modify, and distribute this software for any
12  * purpose with or without fee is hereby granted, provided that the above
13  * copyright notice and this permission notice appear in all copies.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
16  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
17  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
18  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
19  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
20  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
21  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22  */
23 
24 %{
25 #include <sys/time.h>
26 #include <sys/types.h>
27 #include <sys/queue.h>
28 #include <sys/stat.h>
29 
30 #include <ctype.h>
31 #include <err.h>
32 #include <errno.h>
33 #include <event.h>
34 #include <imsg.h>
35 #include <limits.h>
36 #include <sha1.h>
37 #include <stdarg.h>
38 #include <stdlib.h>
39 #include <stdio.h>
40 #include <string.h>
41 #include <syslog.h>
42 #include <unistd.h>
43 
44 #include "got_error.h"
45 #include "got_path.h"
46 
47 #include "log.h"
48 #include "gotd.h"
49 #include "auth.h"
50 #include "listen.h"
51 
52 TAILQ_HEAD(files, file)		 files = TAILQ_HEAD_INITIALIZER(files);
53 static struct file {
54 	TAILQ_ENTRY(file)	 entry;
55 	FILE			*stream;
56 	char			*name;
57 	int			 lineno;
58 	int			 errors;
59 } *file;
60 struct file	*newfile(const char *, int);
61 static void	 closefile(struct file *);
62 int		 check_file_secrecy(int, const char *);
63 int		 yyparse(void);
64 int		 yylex(void);
65 int		 yyerror(const char *, ...)
66     __attribute__((__format__ (printf, 1, 2)))
67     __attribute__((__nonnull__ (1)));
68 int		 kw_cmp(const void *, const void *);
69 int		 lookup(char *);
70 int		 lgetc(int);
71 int		 lungetc(int);
72 int		 findeol(void);
73 
74 TAILQ_HEAD(symhead, sym)	 symhead = TAILQ_HEAD_INITIALIZER(symhead);
75 struct sym {
76 	TAILQ_ENTRY(sym)	 entry;
77 	int			 used;
78 	int			 persist;
79 	char			*nam;
80 	char			*val;
81 };
82 
83 int	 symset(const char *, const char *, int);
84 char	*symget(const char *);
85 
86 static int		 errors;
87 
88 static struct gotd		*gotd;
89 static struct gotd_repo		*new_repo;
90 static int			 conf_limit_user_connections(const char *, int);
91 static struct gotd_repo		*conf_new_repo(const char *);
92 static void			 conf_new_access_rule(struct gotd_repo *,
93 				    enum gotd_access, int, char *);
94 static enum gotd_procid		 gotd_proc_id;
95 
96 typedef struct {
97 	union {
98 		long long	 number;
99 		char		*string;
100 		struct timeval	 tv;
101 	} v;
102 	int lineno;
103 } YYSTYPE;
104 
105 %}
106 
107 %token	PATH ERROR LISTEN ON USER REPOSITORY PERMIT DENY
108 %token	RO RW CONNECTION LIMIT REQUEST TIMEOUT
109 
110 %token	<v.string>	STRING
111 %token	<v.number>	NUMBER
112 %type	<v.number>	boolean
113 %type	<v.tv>		timeout
114 
115 %%
116 
117 grammar		:
118 		| grammar '\n'
119 		| grammar main '\n'
120 		| grammar repository '\n'
121 		;
122 
123 boolean		: STRING {
124 			if (strcasecmp($1, "1") == 0 ||
125 			    strcasecmp($1, "yes") == 0 ||
126 			    strcasecmp($1, "on") == 0)
127 				$$ = 1;
128 			else if (strcasecmp($1, "0") == 0 ||
129 			    strcasecmp($1, "off") == 0 ||
130 			    strcasecmp($1, "no") == 0)
131 				$$ = 0;
132 			else {
133 				yyerror("invalid boolean value '%s'", $1);
134 				free($1);
135 				YYERROR;
136 			}
137 			free($1);
138 		}
139 		| ON { $$ = 1; }
140 		| NUMBER { $$ = $1; }
141 		;
142 
143 timeout		: NUMBER {
144 			if ($1 < 0) {
145 				yyerror("invalid timeout: %lld", $1);
146 				YYERROR;
147 			}
148 			$$.tv_sec = $1;
149 			$$.tv_usec = 0;
150 		}
151 		| STRING {
152 			const char	*errstr;
153 			const char	*type = "seconds";
154 			size_t		 len;
155 			int		 mul = 1;
156 
157 			if (*$1 == '\0') {
158 				yyerror("invalid number of seconds: %s", $1);
159 				free($1);
160 				YYERROR;
161 			}
162 
163 			len = strlen($1);
164 			switch ($1[len - 1]) {
165 			case 'S':
166 			case 's':
167 				$1[len - 1] = '\0';
168 				break;
169 			case 'M':
170 			case 'm':
171 				type = "minutes";
172 				mul = 60;
173 				$1[len - 1] = '\0';
174 				break;
175 			case 'H':
176 			case 'h':
177 				type = "hours";
178 				mul = 60 * 60;
179 				$1[len - 1] = '\0';
180 				break;
181 			}
182 
183 			$$.tv_usec = 0;
184 			$$.tv_sec = strtonum($1, 0, INT_MAX / mul, &errstr);
185 			if (errstr) {
186 				yyerror("number of %s is %s: %s", type,
187 				    errstr, $1);
188 				free($1);
189 				YYERROR;
190 			}
191 
192 			$$.tv_sec *= mul;
193 			free($1);
194 		}
195 		;
196 
197 main		: LISTEN ON STRING {
198 			if (gotd_proc_id == PROC_LISTEN) {
199 				if (strlcpy(gotd->unix_socket_path, $3,
200 				    sizeof(gotd->unix_socket_path)) >=
201 				    sizeof(gotd->unix_socket_path)) {
202 					yyerror("%s: unix socket path too long",
203 					    __func__);
204 					free($3);
205 					YYERROR;
206 				}
207 			}
208 			free($3);
209 		}
210 		| USER STRING {
211 			if (strlcpy(gotd->user_name, $2,
212 			    sizeof(gotd->user_name)) >=
213 			    sizeof(gotd->user_name)) {
214 				yyerror("%s: user name too long", __func__);
215 				free($2);
216 				YYERROR;
217 			}
218 			free($2);
219 		}
220 		| connection
221 		;
222 
223 connection	: CONNECTION '{' optnl conflags_l '}'
224 		| CONNECTION conflags
225 
226 conflags_l	: conflags optnl conflags_l
227 		| conflags optnl
228 		;
229 
230 conflags	: REQUEST TIMEOUT timeout		{
231 			if ($3.tv_sec <= 0) {
232 				yyerror("invalid timeout: %lld", $3.tv_sec);
233 				YYERROR;
234 			}
235 			memcpy(&gotd->request_timeout, &$3,
236 			    sizeof(gotd->request_timeout));
237 		}
238 		| LIMIT USER STRING NUMBER	{
239 			if (gotd_proc_id == PROC_LISTEN &&
240 			    conf_limit_user_connections($3, $4) == -1) {
241 				free($3);
242 				YYERROR;
243 			}
244 			free($3);
245 		}
246 		;
247 
248 repository	: REPOSITORY STRING {
249 			struct gotd_repo *repo;
250 
251 			TAILQ_FOREACH(repo, &gotd->repos, entry) {
252 				if (strcmp(repo->name, $2) == 0) {
253 					yyerror("duplicate repository '%s'", $2);
254 					free($2);
255 					YYERROR;
256 				}
257 			}
258 
259 			if (gotd_proc_id == PROC_GOTD ||
260 			    gotd_proc_id == PROC_AUTH) {
261 				new_repo = conf_new_repo($2);
262 			}
263 			free($2);
264 		} '{' optnl repoopts2 '}' {
265 		}
266 		;
267 
268 repoopts1	: PATH STRING {
269 			if (gotd_proc_id == PROC_GOTD ||
270 			    gotd_proc_id == PROC_AUTH) {
271 				if (!got_path_is_absolute($2)) {
272 					yyerror("%s: path %s is not absolute",
273 					    __func__, $2);
274 					free($2);
275 					YYERROR;
276 				}
277 				if (strlcpy(new_repo->path, $2,
278 				    sizeof(new_repo->path)) >=
279 				    sizeof(new_repo->path)) {
280 					yyerror("%s: path truncated", __func__);
281 					free($2);
282 					YYERROR;
283 				}
284 			}
285 			free($2);
286 		}
287 		| PERMIT RO STRING {
288 			if (gotd_proc_id == PROC_AUTH) {
289 				conf_new_access_rule(new_repo,
290 				    GOTD_ACCESS_PERMITTED, GOTD_AUTH_READ, $3);
291 			}
292 		}
293 		| PERMIT RW STRING {
294 			if (gotd_proc_id == PROC_AUTH) {
295 				conf_new_access_rule(new_repo,
296 				    GOTD_ACCESS_PERMITTED,
297 				    GOTD_AUTH_READ | GOTD_AUTH_WRITE, $3);
298 			}
299 		}
300 		| DENY STRING {
301 			if (gotd_proc_id == PROC_AUTH) {
302 				conf_new_access_rule(new_repo,
303 				    GOTD_ACCESS_DENIED, 0, $2);
304 			}
305 		}
306 		;
307 
308 repoopts2	: repoopts2 repoopts1 nl
309 		| repoopts1 optnl
310 		;
311 
312 nl		: '\n' optnl
313 		;
314 
315 optnl		: '\n' optnl		/* zero or more newlines */
316 		| /* empty */
317 		;
318 
319 %%
320 
321 struct keywords {
322 	const char	*k_name;
323 	int		 k_val;
324 };
325 
326 int
327 yyerror(const char *fmt, ...)
328 {
329 	va_list ap;
330 	char *msg;
331 
332 	file->errors++;
333 	va_start(ap, fmt);
334 	if (vasprintf(&msg, fmt, ap) == -1)
335 		fatalx("yyerror vasprintf");
336 	va_end(ap);
337 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
338 	free(msg);
339 	return (0);
340 }
341 
342 int
343 kw_cmp(const void *k, const void *e)
344 {
345 	return (strcmp(k, ((const struct keywords *)e)->k_name));
346 }
347 
348 int
349 lookup(char *s)
350 {
351 	/* This has to be sorted always. */
352 	static const struct keywords keywords[] = {
353 		{ "connection",			CONNECTION },
354 		{ "deny",			DENY },
355 		{ "limit",			LIMIT },
356 		{ "listen",			LISTEN },
357 		{ "on",				ON },
358 		{ "path",			PATH },
359 		{ "permit",			PERMIT },
360 		{ "repository",			REPOSITORY },
361 		{ "request",			REQUEST },
362 		{ "ro",				RO },
363 		{ "rw",				RW },
364 		{ "timeout",			TIMEOUT },
365 		{ "user",			USER },
366 	};
367 	const struct keywords *p;
368 
369 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
370 	    sizeof(keywords[0]), kw_cmp);
371 
372 	if (p)
373 		return (p->k_val);
374 	else
375 		return (STRING);
376 }
377 
378 #define MAXPUSHBACK	128
379 
380 unsigned char *parsebuf;
381 int parseindex;
382 unsigned char pushback_buffer[MAXPUSHBACK];
383 int pushback_index = 0;
384 
385 int
386 lgetc(int quotec)
387 {
388 	int c, next;
389 
390 	if (parsebuf) {
391 		/* Read character from the parsebuffer instead of input. */
392 		if (parseindex >= 0) {
393 			c = parsebuf[parseindex++];
394 			if (c != '\0')
395 				return (c);
396 			parsebuf = NULL;
397 		} else
398 			parseindex++;
399 	}
400 
401 	if (pushback_index)
402 		return (pushback_buffer[--pushback_index]);
403 
404 	if (quotec) {
405 		c = getc(file->stream);
406 		if (c == EOF)
407 			yyerror("reached end of file while parsing "
408 			    "quoted string");
409 		return (c);
410 	}
411 
412 	c = getc(file->stream);
413 	while (c == '\\') {
414 		next = getc(file->stream);
415 		if (next != '\n') {
416 			c = next;
417 			break;
418 		}
419 		yylval.lineno = file->lineno;
420 		file->lineno++;
421 		c = getc(file->stream);
422 	}
423 
424 	return (c);
425 }
426 
427 int
428 lungetc(int c)
429 {
430 	if (c == EOF)
431 		return (EOF);
432 	if (parsebuf) {
433 		parseindex--;
434 		if (parseindex >= 0)
435 			return (c);
436 	}
437 	if (pushback_index < MAXPUSHBACK-1)
438 		return (pushback_buffer[pushback_index++] = c);
439 	else
440 		return (EOF);
441 }
442 
443 int
444 findeol(void)
445 {
446 	int c;
447 
448 	parsebuf = NULL;
449 
450 	/* Skip to either EOF or the first real EOL. */
451 	while (1) {
452 		if (pushback_index)
453 			c = pushback_buffer[--pushback_index];
454 		else
455 			c = lgetc(0);
456 		if (c == '\n') {
457 			file->lineno++;
458 			break;
459 		}
460 		if (c == EOF)
461 			break;
462 	}
463 	return (ERROR);
464 }
465 
466 int
467 yylex(void)
468 {
469 	unsigned char buf[8096];
470 	unsigned char *p, *val;
471 	int quotec, next, c;
472 	int token;
473 
474 top:
475 	p = buf;
476 	c = lgetc(0);
477 	while (c == ' ' || c == '\t')
478 		c = lgetc(0); /* nothing */
479 
480 	yylval.lineno = file->lineno;
481 	if (c == '#') {
482 		c = lgetc(0);
483 		while (c != '\n' && c != EOF)
484 			c = lgetc(0); /* nothing */
485 	}
486 	if (c == '$' && parsebuf == NULL) {
487 		while (1) {
488 			c = lgetc(0);
489 			if (c == EOF)
490 				return (0);
491 
492 			if (p + 1 >= buf + sizeof(buf) - 1) {
493 				yyerror("string too long");
494 				return (findeol());
495 			}
496 			if (isalnum(c) || c == '_') {
497 				*p++ = c;
498 				continue;
499 			}
500 			*p = '\0';
501 			lungetc(c);
502 			break;
503 		}
504 		val = symget(buf);
505 		if (val == NULL) {
506 			yyerror("macro '%s' not defined", buf);
507 			return (findeol());
508 		}
509 		parsebuf = val;
510 		parseindex = 0;
511 		goto top;
512 	}
513 
514 	switch (c) {
515 	case '\'':
516 	case '"':
517 		quotec = c;
518 		while (1) {
519 			c = lgetc(quotec);
520 			if (c == EOF)
521 				return (0);
522 			if (c == '\n') {
523 				file->lineno++;
524 				continue;
525 			} else if (c == '\\') {
526 				next = lgetc(quotec);
527 				if (next == EOF)
528 					return (0);
529 				if (next == quotec || c == ' ' || c == '\t')
530 					c = next;
531 				else if (next == '\n') {
532 					file->lineno++;
533 					continue;
534 				} else
535 					lungetc(next);
536 			} else if (c == quotec) {
537 				*p = '\0';
538 				break;
539 			} else if (c == '\0') {
540 				yyerror("syntax error");
541 				return (findeol());
542 			}
543 			if (p + 1 >= buf + sizeof(buf) - 1) {
544 				yyerror("string too long");
545 				return (findeol());
546 			}
547 			*p++ = c;
548 		}
549 		yylval.v.string = strdup(buf);
550 		if (yylval.v.string == NULL)
551 			err(1, "yylex: strdup");
552 		return (STRING);
553 	}
554 
555 #define allowed_to_end_number(x) \
556 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
557 
558 	if (c == '-' || isdigit(c)) {
559 		do {
560 			*p++ = c;
561 			if ((unsigned)(p-buf) >= sizeof(buf)) {
562 				yyerror("string too long");
563 				return (findeol());
564 			}
565 			c = lgetc(0);
566 		} while (c != EOF && isdigit(c));
567 		lungetc(c);
568 		if (p == buf + 1 && buf[0] == '-')
569 			goto nodigits;
570 		if (c == EOF || allowed_to_end_number(c)) {
571 			const char *errstr = NULL;
572 
573 			*p = '\0';
574 			yylval.v.number = strtonum(buf, LLONG_MIN,
575 			    LLONG_MAX, &errstr);
576 			if (errstr) {
577 				yyerror("\"%s\" invalid number: %s",
578 				    buf, errstr);
579 				return (findeol());
580 			}
581 			return (NUMBER);
582 		} else {
583 nodigits:
584 			while (p > buf + 1)
585 				lungetc(*--p);
586 			c = *--p;
587 			if (c == '-')
588 				return (c);
589 		}
590 	}
591 
592 #define allowed_in_string(x) \
593 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
594 	x != '{' && x != '}' && \
595 	x != '!' && x != '=' && x != '#' && \
596 	x != ','))
597 
598 	if (isalnum(c) || c == ':' || c == '_') {
599 		do {
600 			*p++ = c;
601 			if ((unsigned)(p-buf) >= sizeof(buf)) {
602 				yyerror("string too long");
603 				return (findeol());
604 			}
605 			c = lgetc(0);
606 		} while (c != EOF && (allowed_in_string(c)));
607 		lungetc(c);
608 		*p = '\0';
609 		token = lookup(buf);
610 		if (token == STRING) {
611 			yylval.v.string = strdup(buf);
612 			if (yylval.v.string == NULL)
613 				err(1, "yylex: strdup");
614 		}
615 		return (token);
616 	}
617 	if (c == '\n') {
618 		yylval.lineno = file->lineno;
619 		file->lineno++;
620 	}
621 	if (c == EOF)
622 		return (0);
623 	return (c);
624 }
625 
626 int
627 check_file_secrecy(int fd, const char *fname)
628 {
629 	struct stat st;
630 
631 	if (fstat(fd, &st)) {
632 		log_warn("cannot stat %s", fname);
633 		return (-1);
634 	}
635 	if (st.st_uid != 0 && st.st_uid != getuid()) {
636 		log_warnx("%s: owner not root or current user", fname);
637 		return (-1);
638 	}
639 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
640 		log_warnx("%s: group writable or world read/writable", fname);
641 		return (-1);
642 	}
643 	return (0);
644 }
645 
646 struct file *
647 newfile(const char *name, int secret)
648 {
649 	struct file *nfile;
650 
651 	nfile = calloc(1, sizeof(struct file));
652 	if (nfile == NULL) {
653 		log_warn("calloc");
654 		return (NULL);
655 	}
656 	nfile->name = strdup(name);
657 	if (nfile->name == NULL) {
658 		log_warn("strdup");
659 		free(nfile);
660 		return (NULL);
661 	}
662 	nfile->stream = fopen(nfile->name, "r");
663 	if (nfile->stream == NULL) {
664 		/* no warning, we don't require a conf file */
665 		free(nfile->name);
666 		free(nfile);
667 		return (NULL);
668 	} else if (secret &&
669 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
670 		fclose(nfile->stream);
671 		free(nfile->name);
672 		free(nfile);
673 		return (NULL);
674 	}
675 	nfile->lineno = 1;
676 	return (nfile);
677 }
678 
679 static void
680 closefile(struct file *xfile)
681 {
682 	fclose(xfile->stream);
683 	free(xfile->name);
684 	free(xfile);
685 }
686 
687 int
688 parse_config(const char *filename, enum gotd_procid proc_id,
689     struct gotd *env)
690 {
691 	struct sym *sym, *next;
692 	struct gotd_repo *repo;
693 
694 	memset(env, 0, sizeof(*env));
695 
696 	gotd = env;
697 	gotd_proc_id = proc_id;
698 	TAILQ_INIT(&gotd->repos);
699 
700 	/* Apply default values. */
701 	if (strlcpy(gotd->unix_socket_path, GOTD_UNIX_SOCKET,
702 	    sizeof(gotd->unix_socket_path)) >= sizeof(gotd->unix_socket_path)) {
703 		fprintf(stderr, "%s: unix socket path too long", __func__);
704 		return -1;
705 	}
706 	if (strlcpy(gotd->user_name, GOTD_USER,
707 	    sizeof(gotd->user_name)) >= sizeof(gotd->user_name)) {
708 		fprintf(stderr, "%s: user name too long", __func__);
709 		return -1;
710 	}
711 
712 	gotd->request_timeout.tv_sec = GOTD_DEFAULT_REQUEST_TIMEOUT;
713 	gotd->request_timeout.tv_usec = 0;
714 
715 	file = newfile(filename, 0);
716 	if (file == NULL) {
717 		/* just return, as we don't require a conf file */
718 		return (0);
719 	}
720 
721 	yyparse();
722 	errors = file->errors;
723 	closefile(file);
724 
725 	/* Free macros and check which have not been used. */
726 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
727 		if ((gotd->verbosity > 1) && !sym->used)
728 			fprintf(stderr, "warning: macro '%s' not used\n",
729 			    sym->nam);
730 		if (!sym->persist) {
731 			free(sym->nam);
732 			free(sym->val);
733 			TAILQ_REMOVE(&symhead, sym, entry);
734 			free(sym);
735 		}
736 	}
737 
738 	if (errors)
739 		return (-1);
740 
741 	TAILQ_FOREACH(repo, &gotd->repos, entry) {
742 		if (repo->path[0] == '\0') {
743 			log_warnx("repository \"%s\": no path provided in "
744 			    "configuration file", repo->name);
745 			return (-1);
746 		}
747 	}
748 
749 	return (0);
750 }
751 
752 static int
753 uid_connection_limit_cmp(const void *pa, const void *pb)
754 {
755 	const struct gotd_uid_connection_limit *a = pa, *b = pb;
756 
757 	if (a->uid < b->uid)
758 		return -1;
759 	else if (a->uid > b->uid);
760 		return 1;
761 
762 	return 0;
763 }
764 
765 static int
766 conf_limit_user_connections(const char *user, int maximum)
767 {
768 	uid_t uid;
769 	struct gotd_uid_connection_limit *limit;
770 	size_t nlimits;
771 
772 	if (maximum < 1) {
773 		yyerror("max connections cannot be smaller 1");
774 		return -1;
775 	}
776 	if (maximum > GOTD_MAXCLIENTS) {
777 		yyerror("max connections must be <= %d", GOTD_MAXCLIENTS);
778 		return -1;
779 	}
780 
781 	if (gotd_auth_parseuid(user, &uid) == -1) {
782 		yyerror("%s: no such user", user);
783 		return -1;
784 	}
785 
786 	limit = gotd_find_uid_connection_limit(gotd->connection_limits,
787 	    gotd->nconnection_limits, uid);
788 	if (limit) {
789 		limit->max_connections = maximum;
790 		return 0;
791 	}
792 
793 	limit = gotd->connection_limits;
794 	nlimits = gotd->nconnection_limits + 1;
795 	limit = reallocarray(limit, nlimits, sizeof(*limit));
796 	if (limit == NULL)
797 		fatal("reallocarray");
798 
799 	limit[nlimits - 1].uid = uid;
800 	limit[nlimits - 1].max_connections = maximum;
801 
802 	gotd->connection_limits = limit;
803 	gotd->nconnection_limits = nlimits;
804 	qsort(gotd->connection_limits, gotd->nconnection_limits,
805 	    sizeof(gotd->connection_limits[0]), uid_connection_limit_cmp);
806 
807 	return 0;
808 }
809 
810 static struct gotd_repo *
811 conf_new_repo(const char *name)
812 {
813 	struct gotd_repo *repo;
814 
815 	if (name[0] == '\0') {
816 		fatalx("syntax error: empty repository name found in %s",
817 		    file->name);
818 	}
819 
820 	if (strchr(name, '\n') != NULL)
821 		fatalx("repository names must not contain linefeeds: %s", name);
822 
823 	repo = calloc(1, sizeof(*repo));
824 	if (repo == NULL)
825 		fatalx("%s: calloc", __func__);
826 
827 	STAILQ_INIT(&repo->rules);
828 
829 	if (strlcpy(repo->name, name, sizeof(repo->name)) >=
830 	    sizeof(repo->name))
831 		fatalx("%s: strlcpy", __func__);
832 
833 	TAILQ_INSERT_TAIL(&gotd->repos, repo, entry);
834 	gotd->nrepos++;
835 
836 	return repo;
837 };
838 
839 static void
840 conf_new_access_rule(struct gotd_repo *repo, enum gotd_access access,
841     int authorization, char *identifier)
842 {
843 	struct gotd_access_rule *rule;
844 
845 	rule = calloc(1, sizeof(*rule));
846 	if (rule == NULL)
847 		fatal("calloc");
848 
849 	rule->access = access;
850 	rule->authorization = authorization;
851 	rule->identifier = identifier;
852 
853 	STAILQ_INSERT_TAIL(&repo->rules, rule, entry);
854 }
855 
856 int
857 symset(const char *nam, const char *val, int persist)
858 {
859 	struct sym *sym;
860 
861 	TAILQ_FOREACH(sym, &symhead, entry) {
862 		if (strcmp(nam, sym->nam) == 0)
863 			break;
864 	}
865 
866 	if (sym != NULL) {
867 		if (sym->persist == 1)
868 			return (0);
869 		else {
870 			free(sym->nam);
871 			free(sym->val);
872 			TAILQ_REMOVE(&symhead, sym, entry);
873 			free(sym);
874 		}
875 	}
876 	sym = calloc(1, sizeof(*sym));
877 	if (sym == NULL)
878 		return (-1);
879 
880 	sym->nam = strdup(nam);
881 	if (sym->nam == NULL) {
882 		free(sym);
883 		return (-1);
884 	}
885 	sym->val = strdup(val);
886 	if (sym->val == NULL) {
887 		free(sym->nam);
888 		free(sym);
889 		return (-1);
890 	}
891 	sym->used = 0;
892 	sym->persist = persist;
893 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
894 	return (0);
895 }
896 
897 char *
898 symget(const char *nam)
899 {
900 	struct sym *sym;
901 
902 	TAILQ_FOREACH(sym, &symhead, entry) {
903 		if (strcmp(nam, sym->nam) == 0) {
904 			sym->used = 1;
905 			return (sym->val);
906 		}
907 	}
908 	return (NULL);
909 }