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 (realpath($2, new_repo->path) == NULL) {
278 					yyerror("realpath %s: %s", $2, strerror(errno));
279 					free($2);
280 					YYERROR;
281 				}
282 			}
283 			free($2);
284 		}
285 		| PERMIT RO STRING {
286 			if (gotd_proc_id == PROC_AUTH) {
287 				conf_new_access_rule(new_repo,
288 				    GOTD_ACCESS_PERMITTED, GOTD_AUTH_READ, $3);
289 			}
290 		}
291 		| PERMIT RW STRING {
292 			if (gotd_proc_id == PROC_AUTH) {
293 				conf_new_access_rule(new_repo,
294 				    GOTD_ACCESS_PERMITTED,
295 				    GOTD_AUTH_READ | GOTD_AUTH_WRITE, $3);
296 			}
297 		}
298 		| DENY STRING {
299 			if (gotd_proc_id == PROC_AUTH) {
300 				conf_new_access_rule(new_repo,
301 				    GOTD_ACCESS_DENIED, 0, $2);
302 			}
303 		}
304 		;
305 
306 repoopts2	: repoopts2 repoopts1 nl
307 		| repoopts1 optnl
308 		;
309 
310 nl		: '\n' optnl
311 		;
312 
313 optnl		: '\n' optnl		/* zero or more newlines */
314 		| /* empty */
315 		;
316 
317 %%
318 
319 struct keywords {
320 	const char	*k_name;
321 	int		 k_val;
322 };
323 
324 int
325 yyerror(const char *fmt, ...)
326 {
327 	va_list ap;
328 	char *msg;
329 
330 	file->errors++;
331 	va_start(ap, fmt);
332 	if (vasprintf(&msg, fmt, ap) == -1)
333 		fatalx("yyerror vasprintf");
334 	va_end(ap);
335 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
336 	free(msg);
337 	return (0);
338 }
339 
340 int
341 kw_cmp(const void *k, const void *e)
342 {
343 	return (strcmp(k, ((const struct keywords *)e)->k_name));
344 }
345 
346 int
347 lookup(char *s)
348 {
349 	/* This has to be sorted always. */
350 	static const struct keywords keywords[] = {
351 		{ "connection",			CONNECTION },
352 		{ "deny",			DENY },
353 		{ "limit",			LIMIT },
354 		{ "listen",			LISTEN },
355 		{ "on",				ON },
356 		{ "path",			PATH },
357 		{ "permit",			PERMIT },
358 		{ "repository",			REPOSITORY },
359 		{ "request",			REQUEST },
360 		{ "ro",				RO },
361 		{ "rw",				RW },
362 		{ "timeout",			TIMEOUT },
363 		{ "user",			USER },
364 	};
365 	const struct keywords *p;
366 
367 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
368 	    sizeof(keywords[0]), kw_cmp);
369 
370 	if (p)
371 		return (p->k_val);
372 	else
373 		return (STRING);
374 }
375 
376 #define MAXPUSHBACK	128
377 
378 unsigned char *parsebuf;
379 int parseindex;
380 unsigned char pushback_buffer[MAXPUSHBACK];
381 int pushback_index = 0;
382 
383 int
384 lgetc(int quotec)
385 {
386 	int c, next;
387 
388 	if (parsebuf) {
389 		/* Read character from the parsebuffer instead of input. */
390 		if (parseindex >= 0) {
391 			c = parsebuf[parseindex++];
392 			if (c != '\0')
393 				return (c);
394 			parsebuf = NULL;
395 		} else
396 			parseindex++;
397 	}
398 
399 	if (pushback_index)
400 		return (pushback_buffer[--pushback_index]);
401 
402 	if (quotec) {
403 		c = getc(file->stream);
404 		if (c == EOF)
405 			yyerror("reached end of file while parsing "
406 			    "quoted string");
407 		return (c);
408 	}
409 
410 	c = getc(file->stream);
411 	while (c == '\\') {
412 		next = getc(file->stream);
413 		if (next != '\n') {
414 			c = next;
415 			break;
416 		}
417 		yylval.lineno = file->lineno;
418 		file->lineno++;
419 		c = getc(file->stream);
420 	}
421 
422 	return (c);
423 }
424 
425 int
426 lungetc(int c)
427 {
428 	if (c == EOF)
429 		return (EOF);
430 	if (parsebuf) {
431 		parseindex--;
432 		if (parseindex >= 0)
433 			return (c);
434 	}
435 	if (pushback_index < MAXPUSHBACK-1)
436 		return (pushback_buffer[pushback_index++] = c);
437 	else
438 		return (EOF);
439 }
440 
441 int
442 findeol(void)
443 {
444 	int c;
445 
446 	parsebuf = NULL;
447 
448 	/* Skip to either EOF or the first real EOL. */
449 	while (1) {
450 		if (pushback_index)
451 			c = pushback_buffer[--pushback_index];
452 		else
453 			c = lgetc(0);
454 		if (c == '\n') {
455 			file->lineno++;
456 			break;
457 		}
458 		if (c == EOF)
459 			break;
460 	}
461 	return (ERROR);
462 }
463 
464 int
465 yylex(void)
466 {
467 	unsigned char buf[8096];
468 	unsigned char *p, *val;
469 	int quotec, next, c;
470 	int token;
471 
472 top:
473 	p = buf;
474 	c = lgetc(0);
475 	while (c == ' ' || c == '\t')
476 		c = lgetc(0); /* nothing */
477 
478 	yylval.lineno = file->lineno;
479 	if (c == '#') {
480 		c = lgetc(0);
481 		while (c != '\n' && c != EOF)
482 			c = lgetc(0); /* nothing */
483 	}
484 	if (c == '$' && parsebuf == NULL) {
485 		while (1) {
486 			c = lgetc(0);
487 			if (c == EOF)
488 				return (0);
489 
490 			if (p + 1 >= buf + sizeof(buf) - 1) {
491 				yyerror("string too long");
492 				return (findeol());
493 			}
494 			if (isalnum(c) || c == '_') {
495 				*p++ = c;
496 				continue;
497 			}
498 			*p = '\0';
499 			lungetc(c);
500 			break;
501 		}
502 		val = symget(buf);
503 		if (val == NULL) {
504 			yyerror("macro '%s' not defined", buf);
505 			return (findeol());
506 		}
507 		parsebuf = val;
508 		parseindex = 0;
509 		goto top;
510 	}
511 
512 	switch (c) {
513 	case '\'':
514 	case '"':
515 		quotec = c;
516 		while (1) {
517 			c = lgetc(quotec);
518 			if (c == EOF)
519 				return (0);
520 			if (c == '\n') {
521 				file->lineno++;
522 				continue;
523 			} else if (c == '\\') {
524 				next = lgetc(quotec);
525 				if (next == EOF)
526 					return (0);
527 				if (next == quotec || c == ' ' || c == '\t')
528 					c = next;
529 				else if (next == '\n') {
530 					file->lineno++;
531 					continue;
532 				} else
533 					lungetc(next);
534 			} else if (c == quotec) {
535 				*p = '\0';
536 				break;
537 			} else if (c == '\0') {
538 				yyerror("syntax error");
539 				return (findeol());
540 			}
541 			if (p + 1 >= buf + sizeof(buf) - 1) {
542 				yyerror("string too long");
543 				return (findeol());
544 			}
545 			*p++ = c;
546 		}
547 		yylval.v.string = strdup(buf);
548 		if (yylval.v.string == NULL)
549 			err(1, "yylex: strdup");
550 		return (STRING);
551 	}
552 
553 #define allowed_to_end_number(x) \
554 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
555 
556 	if (c == '-' || isdigit(c)) {
557 		do {
558 			*p++ = c;
559 			if ((unsigned)(p-buf) >= sizeof(buf)) {
560 				yyerror("string too long");
561 				return (findeol());
562 			}
563 			c = lgetc(0);
564 		} while (c != EOF && isdigit(c));
565 		lungetc(c);
566 		if (p == buf + 1 && buf[0] == '-')
567 			goto nodigits;
568 		if (c == EOF || allowed_to_end_number(c)) {
569 			const char *errstr = NULL;
570 
571 			*p = '\0';
572 			yylval.v.number = strtonum(buf, LLONG_MIN,
573 			    LLONG_MAX, &errstr);
574 			if (errstr) {
575 				yyerror("\"%s\" invalid number: %s",
576 				    buf, errstr);
577 				return (findeol());
578 			}
579 			return (NUMBER);
580 		} else {
581 nodigits:
582 			while (p > buf + 1)
583 				lungetc(*--p);
584 			c = *--p;
585 			if (c == '-')
586 				return (c);
587 		}
588 	}
589 
590 #define allowed_in_string(x) \
591 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
592 	x != '{' && x != '}' && \
593 	x != '!' && x != '=' && x != '#' && \
594 	x != ','))
595 
596 	if (isalnum(c) || c == ':' || c == '_') {
597 		do {
598 			*p++ = c;
599 			if ((unsigned)(p-buf) >= sizeof(buf)) {
600 				yyerror("string too long");
601 				return (findeol());
602 			}
603 			c = lgetc(0);
604 		} while (c != EOF && (allowed_in_string(c)));
605 		lungetc(c);
606 		*p = '\0';
607 		token = lookup(buf);
608 		if (token == STRING) {
609 			yylval.v.string = strdup(buf);
610 			if (yylval.v.string == NULL)
611 				err(1, "yylex: strdup");
612 		}
613 		return (token);
614 	}
615 	if (c == '\n') {
616 		yylval.lineno = file->lineno;
617 		file->lineno++;
618 	}
619 	if (c == EOF)
620 		return (0);
621 	return (c);
622 }
623 
624 int
625 check_file_secrecy(int fd, const char *fname)
626 {
627 	struct stat st;
628 
629 	if (fstat(fd, &st)) {
630 		log_warn("cannot stat %s", fname);
631 		return (-1);
632 	}
633 	if (st.st_uid != 0 && st.st_uid != getuid()) {
634 		log_warnx("%s: owner not root or current user", fname);
635 		return (-1);
636 	}
637 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
638 		log_warnx("%s: group writable or world read/writable", fname);
639 		return (-1);
640 	}
641 	return (0);
642 }
643 
644 struct file *
645 newfile(const char *name, int secret)
646 {
647 	struct file *nfile;
648 
649 	nfile = calloc(1, sizeof(struct file));
650 	if (nfile == NULL) {
651 		log_warn("calloc");
652 		return (NULL);
653 	}
654 	nfile->name = strdup(name);
655 	if (nfile->name == NULL) {
656 		log_warn("strdup");
657 		free(nfile);
658 		return (NULL);
659 	}
660 	nfile->stream = fopen(nfile->name, "r");
661 	if (nfile->stream == NULL) {
662 		/* no warning, we don't require a conf file */
663 		free(nfile->name);
664 		free(nfile);
665 		return (NULL);
666 	} else if (secret &&
667 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
668 		fclose(nfile->stream);
669 		free(nfile->name);
670 		free(nfile);
671 		return (NULL);
672 	}
673 	nfile->lineno = 1;
674 	return (nfile);
675 }
676 
677 static void
678 closefile(struct file *xfile)
679 {
680 	fclose(xfile->stream);
681 	free(xfile->name);
682 	free(xfile);
683 }
684 
685 int
686 parse_config(const char *filename, enum gotd_procid proc_id,
687     struct gotd *env)
688 {
689 	struct sym *sym, *next;
690 	struct gotd_repo *repo;
691 
692 	memset(env, 0, sizeof(*env));
693 
694 	gotd = env;
695 	gotd_proc_id = proc_id;
696 	TAILQ_INIT(&gotd->repos);
697 
698 	/* Apply default values. */
699 	if (strlcpy(gotd->unix_socket_path, GOTD_UNIX_SOCKET,
700 	    sizeof(gotd->unix_socket_path)) >= sizeof(gotd->unix_socket_path)) {
701 		fprintf(stderr, "%s: unix socket path too long", __func__);
702 		return -1;
703 	}
704 	if (strlcpy(gotd->user_name, GOTD_USER,
705 	    sizeof(gotd->user_name)) >= sizeof(gotd->user_name)) {
706 		fprintf(stderr, "%s: user name too long", __func__);
707 		return -1;
708 	}
709 
710 	gotd->request_timeout.tv_sec = GOTD_DEFAULT_REQUEST_TIMEOUT;
711 	gotd->request_timeout.tv_usec = 0;
712 
713 	file = newfile(filename, 0);
714 	if (file == NULL) {
715 		/* just return, as we don't require a conf file */
716 		return (0);
717 	}
718 
719 	yyparse();
720 	errors = file->errors;
721 	closefile(file);
722 
723 	/* Free macros and check which have not been used. */
724 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
725 		if ((gotd->verbosity > 1) && !sym->used)
726 			fprintf(stderr, "warning: macro '%s' not used\n",
727 			    sym->nam);
728 		if (!sym->persist) {
729 			free(sym->nam);
730 			free(sym->val);
731 			TAILQ_REMOVE(&symhead, sym, entry);
732 			free(sym);
733 		}
734 	}
735 
736 	if (errors)
737 		return (-1);
738 
739 	TAILQ_FOREACH(repo, &gotd->repos, entry) {
740 		if (repo->path[0] == '\0') {
741 			log_warnx("repository \"%s\": no path provided in "
742 			    "configuration file", repo->name);
743 			return (-1);
744 		}
745 	}
746 
747 	return (0);
748 }
749 
750 static int
751 uid_connection_limit_cmp(const void *pa, const void *pb)
752 {
753 	const struct gotd_uid_connection_limit *a = pa, *b = pb;
754 
755 	if (a->uid < b->uid)
756 		return -1;
757 	else if (a->uid > b->uid);
758 		return 1;
759 
760 	return 0;
761 }
762 
763 static int
764 conf_limit_user_connections(const char *user, int maximum)
765 {
766 	uid_t uid;
767 	struct gotd_uid_connection_limit *limit;
768 	size_t nlimits;
769 
770 	if (maximum < 1) {
771 		yyerror("max connections cannot be smaller 1");
772 		return -1;
773 	}
774 	if (maximum > GOTD_MAXCLIENTS) {
775 		yyerror("max connections must be <= %d", GOTD_MAXCLIENTS);
776 		return -1;
777 	}
778 
779 	if (gotd_auth_parseuid(user, &uid) == -1) {
780 		yyerror("%s: no such user", user);
781 		return -1;
782 	}
783 
784 	limit = gotd_find_uid_connection_limit(gotd->connection_limits,
785 	    gotd->nconnection_limits, uid);
786 	if (limit) {
787 		limit->max_connections = maximum;
788 		return 0;
789 	}
790 
791 	limit = gotd->connection_limits;
792 	nlimits = gotd->nconnection_limits + 1;
793 	limit = reallocarray(limit, nlimits, sizeof(*limit));
794 	if (limit == NULL)
795 		fatal("reallocarray");
796 
797 	limit[nlimits - 1].uid = uid;
798 	limit[nlimits - 1].max_connections = maximum;
799 
800 	gotd->connection_limits = limit;
801 	gotd->nconnection_limits = nlimits;
802 	qsort(gotd->connection_limits, gotd->nconnection_limits,
803 	    sizeof(gotd->connection_limits[0]), uid_connection_limit_cmp);
804 
805 	return 0;
806 }
807 
808 static struct gotd_repo *
809 conf_new_repo(const char *name)
810 {
811 	struct gotd_repo *repo;
812 
813 	if (name[0] == '\0') {
814 		fatalx("syntax error: empty repository name found in %s",
815 		    file->name);
816 	}
817 
818 	if (strchr(name, '\n') != NULL)
819 		fatalx("repository names must not contain linefeeds: %s", name);
820 
821 	repo = calloc(1, sizeof(*repo));
822 	if (repo == NULL)
823 		fatalx("%s: calloc", __func__);
824 
825 	STAILQ_INIT(&repo->rules);
826 
827 	if (strlcpy(repo->name, name, sizeof(repo->name)) >=
828 	    sizeof(repo->name))
829 		fatalx("%s: strlcpy", __func__);
830 
831 	TAILQ_INSERT_TAIL(&gotd->repos, repo, entry);
832 	gotd->nrepos++;
833 
834 	return repo;
835 };
836 
837 static void
838 conf_new_access_rule(struct gotd_repo *repo, enum gotd_access access,
839     int authorization, char *identifier)
840 {
841 	struct gotd_access_rule *rule;
842 
843 	rule = calloc(1, sizeof(*rule));
844 	if (rule == NULL)
845 		fatal("calloc");
846 
847 	rule->access = access;
848 	rule->authorization = authorization;
849 	rule->identifier = identifier;
850 
851 	STAILQ_INSERT_TAIL(&repo->rules, rule, entry);
852 }
853 
854 int
855 symset(const char *nam, const char *val, int persist)
856 {
857 	struct sym *sym;
858 
859 	TAILQ_FOREACH(sym, &symhead, entry) {
860 		if (strcmp(nam, sym->nam) == 0)
861 			break;
862 	}
863 
864 	if (sym != NULL) {
865 		if (sym->persist == 1)
866 			return (0);
867 		else {
868 			free(sym->nam);
869 			free(sym->val);
870 			TAILQ_REMOVE(&symhead, sym, entry);
871 			free(sym);
872 		}
873 	}
874 	sym = calloc(1, sizeof(*sym));
875 	if (sym == NULL)
876 		return (-1);
877 
878 	sym->nam = strdup(nam);
879 	if (sym->nam == NULL) {
880 		free(sym);
881 		return (-1);
882 	}
883 	sym->val = strdup(val);
884 	if (sym->val == NULL) {
885 		free(sym->nam);
886 		free(sym);
887 		return (-1);
888 	}
889 	sym->used = 0;
890 	sym->persist = persist;
891 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
892 	return (0);
893 }
894 
895 char *
896 symget(const char *nam)
897 {
898 	struct sym *sym;
899 
900 	TAILQ_FOREACH(sym, &symhead, entry) {
901 		if (strcmp(nam, sym->nam) == 0) {
902 			sym->used = 1;
903 			return (sym->val);
904 		}
905 	}
906 	return (NULL);
907 }