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 <sha2.h>
38 #include <stdarg.h>
39 #include <stdlib.h>
40 #include <stdio.h>
41 #include <string.h>
42 #include <syslog.h>
43 #include <unistd.h>
44 
45 #include "got_error.h"
46 #include "got_path.h"
47 #include "got_reference.h"
48 
49 #include "log.h"
50 #include "gotd.h"
51 #include "auth.h"
52 #include "listen.h"
53 
54 TAILQ_HEAD(files, file)		 files = TAILQ_HEAD_INITIALIZER(files);
55 static struct file {
56 	TAILQ_ENTRY(file)	 entry;
57 	FILE			*stream;
58 	char			*name;
59 	int			 lineno;
60 	int			 errors;
61 } *file;
62 struct file	*newfile(const char *, int, int);
63 static void	 closefile(struct file *);
64 int		 check_file_secrecy(int, const char *);
65 int		 yyparse(void);
66 int		 yylex(void);
67 int		 yyerror(const char *, ...)
68     __attribute__((__format__ (printf, 1, 2)))
69     __attribute__((__nonnull__ (1)));
70 int		 kw_cmp(const void *, const void *);
71 int		 lookup(char *);
72 int		 lgetc(int);
73 int		 lungetc(int);
74 int		 findeol(void);
75 
76 TAILQ_HEAD(symhead, sym)	 symhead = TAILQ_HEAD_INITIALIZER(symhead);
77 struct sym {
78 	TAILQ_ENTRY(sym)	 entry;
79 	int			 used;
80 	int			 persist;
81 	char			*nam;
82 	char			*val;
83 };
84 
85 int	 symset(const char *, const char *, int);
86 char	*symget(const char *);
87 
88 static int		 errors;
89 
90 static struct gotd		*gotd;
91 static struct gotd_repo		*new_repo;
92 static int			 conf_limit_user_connections(const char *, int);
93 static struct gotd_repo		*conf_new_repo(const char *);
94 static void			 conf_new_access_rule(struct gotd_repo *,
95 				    enum gotd_access, int, char *);
96 static int			 conf_protect_ref_namespace(
97 				    struct got_pathlist_head *, char *);
98 static int			 conf_protect_tag_namespace(struct gotd_repo *,
99 				    char *);
100 static int			 conf_protect_branch_namespace(
101 				    struct gotd_repo *, char *);
102 static int			 conf_protect_branch(struct gotd_repo *,
103 				    char *);
104 static enum gotd_procid		 gotd_proc_id;
105 
106 typedef struct {
107 	union {
108 		long long	 number;
109 		char		*string;
110 		struct timeval	 tv;
111 	} v;
112 	int lineno;
113 } YYSTYPE;
114 
115 %}
116 
117 %token	PATH ERROR LISTEN ON USER REPOSITORY PERMIT DENY
118 %token	RO RW CONNECTION LIMIT REQUEST TIMEOUT
119 %token	PROTECT NAMESPACE BRANCH TAG
120 
121 %token	<v.string>	STRING
122 %token	<v.number>	NUMBER
123 %type	<v.tv>		timeout
124 
125 %%
126 
127 grammar		:
128 		| grammar '\n'
129 		| grammar main '\n'
130 		| grammar repository '\n'
131 		;
132 
133 timeout		: NUMBER {
134 			if ($1 < 0) {
135 				yyerror("invalid timeout: %lld", $1);
136 				YYERROR;
137 			}
138 			$$.tv_sec = $1;
139 			$$.tv_usec = 0;
140 		}
141 		| STRING {
142 			const char	*errstr;
143 			const char	*type = "seconds";
144 			size_t		 len;
145 			int		 mul = 1;
146 
147 			if (*$1 == '\0') {
148 				yyerror("invalid number of seconds: %s", $1);
149 				free($1);
150 				YYERROR;
151 			}
152 
153 			len = strlen($1);
154 			switch ($1[len - 1]) {
155 			case 'S':
156 			case 's':
157 				$1[len - 1] = '\0';
158 				break;
159 			case 'M':
160 			case 'm':
161 				type = "minutes";
162 				mul = 60;
163 				$1[len - 1] = '\0';
164 				break;
165 			case 'H':
166 			case 'h':
167 				type = "hours";
168 				mul = 60 * 60;
169 				$1[len - 1] = '\0';
170 				break;
171 			}
172 
173 			$$.tv_usec = 0;
174 			$$.tv_sec = strtonum($1, 0, INT_MAX / mul, &errstr);
175 			if (errstr) {
176 				yyerror("number of %s is %s: %s", type,
177 				    errstr, $1);
178 				free($1);
179 				YYERROR;
180 			}
181 
182 			$$.tv_sec *= mul;
183 			free($1);
184 		}
185 		;
186 
187 main		: LISTEN ON STRING {
188 			if (!got_path_is_absolute($3))
189 				yyerror("bad unix socket path \"%s\": "
190 				    "must be an absolute path", $3);
191 
192 			if (gotd_proc_id == PROC_LISTEN) {
193 				if (strlcpy(gotd->unix_socket_path, $3,
194 				    sizeof(gotd->unix_socket_path)) >=
195 				    sizeof(gotd->unix_socket_path)) {
196 					yyerror("%s: unix socket path too long",
197 					    __func__);
198 					free($3);
199 					YYERROR;
200 				}
201 			}
202 			free($3);
203 		}
204 		| USER STRING {
205 			if (strlcpy(gotd->user_name, $2,
206 			    sizeof(gotd->user_name)) >=
207 			    sizeof(gotd->user_name)) {
208 				yyerror("%s: user name too long", __func__);
209 				free($2);
210 				YYERROR;
211 			}
212 			free($2);
213 		}
214 		| connection
215 		;
216 
217 connection	: CONNECTION '{' optnl conflags_l '}'
218 		| CONNECTION conflags
219 
220 conflags_l	: conflags optnl conflags_l
221 		| conflags optnl
222 		;
223 
224 conflags	: REQUEST TIMEOUT timeout		{
225 			if ($3.tv_sec <= 0) {
226 				yyerror("invalid timeout: %lld", $3.tv_sec);
227 				YYERROR;
228 			}
229 			memcpy(&gotd->request_timeout, &$3,
230 			    sizeof(gotd->request_timeout));
231 		}
232 		| LIMIT USER STRING NUMBER	{
233 			if (gotd_proc_id == PROC_LISTEN &&
234 			    conf_limit_user_connections($3, $4) == -1) {
235 				free($3);
236 				YYERROR;
237 			}
238 			free($3);
239 		}
240 		;
241 
242 protect		: PROTECT '{' optnl protectflags_l '}'
243 		| PROTECT protectflags
244 
245 protectflags_l	: protectflags optnl protectflags_l
246 		| protectflags optnl
247 		;
248 
249 protectflags	: TAG NAMESPACE STRING {
250 			if (gotd_proc_id == PROC_GOTD ||
251 			    gotd_proc_id == PROC_REPO_WRITE) {
252 				if (conf_protect_tag_namespace(new_repo, $3)) {
253 					free($3);
254 					YYERROR;
255 				}
256 			}
257 		}
258 		| BRANCH NAMESPACE STRING {
259 			if (gotd_proc_id == PROC_GOTD ||
260 			    gotd_proc_id == PROC_REPO_WRITE) {
261 				if (conf_protect_branch_namespace(new_repo,
262 				    $3)) {
263 					free($3);
264 					YYERROR;
265 				}
266 				free($3);
267 			}
268 		}
269 		| BRANCH STRING {
270 			if (gotd_proc_id == PROC_GOTD ||
271 			    gotd_proc_id == PROC_REPO_WRITE) {
272 				if (conf_protect_branch(new_repo, $2)) {
273 					free($2);
274 					YYERROR;
275 				}
276 			}
277 		}
278 		;
279 
280 repository	: REPOSITORY STRING {
281 			struct gotd_repo *repo;
282 
283 			TAILQ_FOREACH(repo, &gotd->repos, entry) {
284 				if (strcmp(repo->name, $2) == 0) {
285 					yyerror("duplicate repository '%s'", $2);
286 					free($2);
287 					YYERROR;
288 				}
289 			}
290 
291 			if (gotd_proc_id == PROC_GOTD ||
292 			    gotd_proc_id == PROC_AUTH ||
293 			    gotd_proc_id == PROC_REPO_WRITE) {
294 				new_repo = conf_new_repo($2);
295 			}
296 			free($2);
297 		} '{' optnl repoopts2 '}' {
298 		}
299 		;
300 
301 repoopts1	: PATH STRING {
302 			if (gotd_proc_id == PROC_GOTD ||
303 			    gotd_proc_id == PROC_AUTH ||
304 			    gotd_proc_id == PROC_REPO_WRITE) {
305 				if (!got_path_is_absolute($2)) {
306 					yyerror("%s: path %s is not absolute",
307 					    __func__, $2);
308 					free($2);
309 					YYERROR;
310 				}
311 				if (realpath($2, new_repo->path) == NULL) {
312 					yyerror("realpath %s: %s", $2, strerror(errno));
313 					free($2);
314 					YYERROR;
315 				}
316 			}
317 			free($2);
318 		}
319 		| PERMIT RO STRING {
320 			if (gotd_proc_id == PROC_AUTH) {
321 				conf_new_access_rule(new_repo,
322 				    GOTD_ACCESS_PERMITTED, GOTD_AUTH_READ, $3);
323 			}
324 		}
325 		| PERMIT RW STRING {
326 			if (gotd_proc_id == PROC_AUTH) {
327 				conf_new_access_rule(new_repo,
328 				    GOTD_ACCESS_PERMITTED,
329 				    GOTD_AUTH_READ | GOTD_AUTH_WRITE, $3);
330 			}
331 		}
332 		| DENY STRING {
333 			if (gotd_proc_id == PROC_AUTH) {
334 				conf_new_access_rule(new_repo,
335 				    GOTD_ACCESS_DENIED, 0, $2);
336 			}
337 		}
338 		| protect
339 		;
340 
341 repoopts2	: repoopts2 repoopts1 nl
342 		| repoopts1 optnl
343 		;
344 
345 nl		: '\n' optnl
346 		;
347 
348 optnl		: '\n' optnl		/* zero or more newlines */
349 		| /* empty */
350 		;
351 
352 %%
353 
354 struct keywords {
355 	const char	*k_name;
356 	int		 k_val;
357 };
358 
359 int
360 yyerror(const char *fmt, ...)
361 {
362 	va_list ap;
363 	char *msg;
364 
365 	file->errors++;
366 	va_start(ap, fmt);
367 	if (vasprintf(&msg, fmt, ap) == -1)
368 		fatalx("yyerror vasprintf");
369 	va_end(ap);
370 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
371 	free(msg);
372 	return (0);
373 }
374 
375 int
376 kw_cmp(const void *k, const void *e)
377 {
378 	return (strcmp(k, ((const struct keywords *)e)->k_name));
379 }
380 
381 int
382 lookup(char *s)
383 {
384 	/* This has to be sorted always. */
385 	static const struct keywords keywords[] = {
386 		{ "branch",			BRANCH },
387 		{ "connection",			CONNECTION },
388 		{ "deny",			DENY },
389 		{ "limit",			LIMIT },
390 		{ "listen",			LISTEN },
391 		{ "namespace",			NAMESPACE },
392 		{ "on",				ON },
393 		{ "path",			PATH },
394 		{ "permit",			PERMIT },
395 		{ "protect",			PROTECT },
396 		{ "repository",			REPOSITORY },
397 		{ "request",			REQUEST },
398 		{ "ro",				RO },
399 		{ "rw",				RW },
400 		{ "tag",			TAG },
401 		{ "timeout",			TIMEOUT },
402 		{ "user",			USER },
403 	};
404 	const struct keywords *p;
405 
406 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
407 	    sizeof(keywords[0]), kw_cmp);
408 
409 	if (p)
410 		return (p->k_val);
411 	else
412 		return (STRING);
413 }
414 
415 #define MAXPUSHBACK	128
416 
417 unsigned char *parsebuf;
418 int parseindex;
419 unsigned char pushback_buffer[MAXPUSHBACK];
420 int pushback_index = 0;
421 
422 int
423 lgetc(int quotec)
424 {
425 	int c, next;
426 
427 	if (parsebuf) {
428 		/* Read character from the parsebuffer instead of input. */
429 		if (parseindex >= 0) {
430 			c = parsebuf[parseindex++];
431 			if (c != '\0')
432 				return (c);
433 			parsebuf = NULL;
434 		} else
435 			parseindex++;
436 	}
437 
438 	if (pushback_index)
439 		return (pushback_buffer[--pushback_index]);
440 
441 	if (quotec) {
442 		c = getc(file->stream);
443 		if (c == EOF)
444 			yyerror("reached end of file while parsing "
445 			    "quoted string");
446 		return (c);
447 	}
448 
449 	c = getc(file->stream);
450 	while (c == '\\') {
451 		next = getc(file->stream);
452 		if (next != '\n') {
453 			c = next;
454 			break;
455 		}
456 		yylval.lineno = file->lineno;
457 		file->lineno++;
458 		c = getc(file->stream);
459 	}
460 
461 	return (c);
462 }
463 
464 int
465 lungetc(int c)
466 {
467 	if (c == EOF)
468 		return (EOF);
469 	if (parsebuf) {
470 		parseindex--;
471 		if (parseindex >= 0)
472 			return (c);
473 	}
474 	if (pushback_index < MAXPUSHBACK-1)
475 		return (pushback_buffer[pushback_index++] = c);
476 	else
477 		return (EOF);
478 }
479 
480 int
481 findeol(void)
482 {
483 	int c;
484 
485 	parsebuf = NULL;
486 
487 	/* Skip to either EOF or the first real EOL. */
488 	while (1) {
489 		if (pushback_index)
490 			c = pushback_buffer[--pushback_index];
491 		else
492 			c = lgetc(0);
493 		if (c == '\n') {
494 			file->lineno++;
495 			break;
496 		}
497 		if (c == EOF)
498 			break;
499 	}
500 	return (ERROR);
501 }
502 
503 int
504 yylex(void)
505 {
506 	unsigned char buf[8096];
507 	unsigned char *p, *val;
508 	int quotec, next, c;
509 	int token;
510 
511 top:
512 	p = buf;
513 	c = lgetc(0);
514 	while (c == ' ' || c == '\t')
515 		c = lgetc(0); /* nothing */
516 
517 	yylval.lineno = file->lineno;
518 	if (c == '#') {
519 		c = lgetc(0);
520 		while (c != '\n' && c != EOF)
521 			c = lgetc(0); /* nothing */
522 	}
523 	if (c == '$' && parsebuf == NULL) {
524 		while (1) {
525 			c = lgetc(0);
526 			if (c == EOF)
527 				return (0);
528 
529 			if (p + 1 >= buf + sizeof(buf) - 1) {
530 				yyerror("string too long");
531 				return (findeol());
532 			}
533 			if (isalnum(c) || c == '_') {
534 				*p++ = c;
535 				continue;
536 			}
537 			*p = '\0';
538 			lungetc(c);
539 			break;
540 		}
541 		val = symget(buf);
542 		if (val == NULL) {
543 			yyerror("macro '%s' not defined", buf);
544 			return (findeol());
545 		}
546 		parsebuf = val;
547 		parseindex = 0;
548 		goto top;
549 	}
550 
551 	switch (c) {
552 	case '\'':
553 	case '"':
554 		quotec = c;
555 		while (1) {
556 			c = lgetc(quotec);
557 			if (c == EOF)
558 				return (0);
559 			if (c == '\n') {
560 				file->lineno++;
561 				continue;
562 			} else if (c == '\\') {
563 				next = lgetc(quotec);
564 				if (next == EOF)
565 					return (0);
566 				if (next == quotec || c == ' ' || c == '\t')
567 					c = next;
568 				else if (next == '\n') {
569 					file->lineno++;
570 					continue;
571 				} else
572 					lungetc(next);
573 			} else if (c == quotec) {
574 				*p = '\0';
575 				break;
576 			} else if (c == '\0') {
577 				yyerror("syntax error");
578 				return (findeol());
579 			}
580 			if (p + 1 >= buf + sizeof(buf) - 1) {
581 				yyerror("string too long");
582 				return (findeol());
583 			}
584 			*p++ = c;
585 		}
586 		yylval.v.string = strdup(buf);
587 		if (yylval.v.string == NULL)
588 			err(1, "yylex: strdup");
589 		return (STRING);
590 	}
591 
592 #define allowed_to_end_number(x) \
593 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
594 
595 	if (c == '-' || isdigit(c)) {
596 		do {
597 			*p++ = c;
598 			if ((unsigned)(p-buf) >= sizeof(buf)) {
599 				yyerror("string too long");
600 				return (findeol());
601 			}
602 			c = lgetc(0);
603 		} while (c != EOF && isdigit(c));
604 		lungetc(c);
605 		if (p == buf + 1 && buf[0] == '-')
606 			goto nodigits;
607 		if (c == EOF || allowed_to_end_number(c)) {
608 			const char *errstr = NULL;
609 
610 			*p = '\0';
611 			yylval.v.number = strtonum(buf, LLONG_MIN,
612 			    LLONG_MAX, &errstr);
613 			if (errstr) {
614 				yyerror("\"%s\" invalid number: %s",
615 				    buf, errstr);
616 				return (findeol());
617 			}
618 			return (NUMBER);
619 		} else {
620 nodigits:
621 			while (p > buf + 1)
622 				lungetc(*--p);
623 			c = *--p;
624 			if (c == '-')
625 				return (c);
626 		}
627 	}
628 
629 #define allowed_in_string(x) \
630 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
631 	x != '{' && x != '}' && \
632 	x != '!' && x != '=' && x != '#' && \
633 	x != ','))
634 
635 	if (isalnum(c) || c == ':' || c == '_') {
636 		do {
637 			*p++ = c;
638 			if ((unsigned)(p-buf) >= sizeof(buf)) {
639 				yyerror("string too long");
640 				return (findeol());
641 			}
642 			c = lgetc(0);
643 		} while (c != EOF && (allowed_in_string(c)));
644 		lungetc(c);
645 		*p = '\0';
646 		token = lookup(buf);
647 		if (token == STRING) {
648 			yylval.v.string = strdup(buf);
649 			if (yylval.v.string == NULL)
650 				err(1, "yylex: strdup");
651 		}
652 		return (token);
653 	}
654 	if (c == '\n') {
655 		yylval.lineno = file->lineno;
656 		file->lineno++;
657 	}
658 	if (c == EOF)
659 		return (0);
660 	return (c);
661 }
662 
663 int
664 check_file_secrecy(int fd, const char *fname)
665 {
666 	struct stat st;
667 
668 	if (fstat(fd, &st)) {
669 		log_warn("cannot stat %s", fname);
670 		return (-1);
671 	}
672 	if (st.st_uid != 0 && st.st_uid != getuid()) {
673 		log_warnx("%s: owner not root or current user", fname);
674 		return (-1);
675 	}
676 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
677 		log_warnx("%s: group writable or world read/writable", fname);
678 		return (-1);
679 	}
680 	return (0);
681 }
682 
683 struct file *
684 newfile(const char *name, int secret, int required)
685 {
686 	struct file *nfile;
687 
688 	nfile = calloc(1, sizeof(struct file));
689 	if (nfile == NULL) {
690 		log_warn("calloc");
691 		return (NULL);
692 	}
693 	nfile->name = strdup(name);
694 	if (nfile->name == NULL) {
695 		log_warn("strdup");
696 		free(nfile);
697 		return (NULL);
698 	}
699 	nfile->stream = fopen(nfile->name, "r");
700 	if (nfile->stream == NULL) {
701 		if (required)
702 			log_warn("open %s", nfile->name);
703 		free(nfile->name);
704 		free(nfile);
705 		return (NULL);
706 	} else if (secret &&
707 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
708 		fclose(nfile->stream);
709 		free(nfile->name);
710 		free(nfile);
711 		return (NULL);
712 	}
713 	nfile->lineno = 1;
714 	return (nfile);
715 }
716 
717 static void
718 closefile(struct file *xfile)
719 {
720 	fclose(xfile->stream);
721 	free(xfile->name);
722 	free(xfile);
723 }
724 
725 int
726 parse_config(const char *filename, enum gotd_procid proc_id,
727     struct gotd *env, int require_config_file)
728 {
729 	struct sym *sym, *next;
730 	struct gotd_repo *repo;
731 
732 	memset(env, 0, sizeof(*env));
733 
734 	gotd = env;
735 	gotd_proc_id = proc_id;
736 	TAILQ_INIT(&gotd->repos);
737 
738 	/* Apply default values. */
739 	if (strlcpy(gotd->unix_socket_path, GOTD_UNIX_SOCKET,
740 	    sizeof(gotd->unix_socket_path)) >= sizeof(gotd->unix_socket_path)) {
741 		fprintf(stderr, "%s: unix socket path too long", __func__);
742 		return -1;
743 	}
744 	if (strlcpy(gotd->user_name, GOTD_USER,
745 	    sizeof(gotd->user_name)) >= sizeof(gotd->user_name)) {
746 		fprintf(stderr, "%s: user name too long", __func__);
747 		return -1;
748 	}
749 
750 	gotd->request_timeout.tv_sec = GOTD_DEFAULT_REQUEST_TIMEOUT;
751 	gotd->request_timeout.tv_usec = 0;
752 
753 	file = newfile(filename, 0, require_config_file);
754 	if (file == NULL)
755 		return require_config_file ? -1 : 0;
756 
757 	yyparse();
758 	errors = file->errors;
759 	closefile(file);
760 
761 	/* Free macros and check which have not been used. */
762 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
763 		if ((gotd->verbosity > 1) && !sym->used)
764 			fprintf(stderr, "warning: macro '%s' not used\n",
765 			    sym->nam);
766 		if (!sym->persist) {
767 			free(sym->nam);
768 			free(sym->val);
769 			TAILQ_REMOVE(&symhead, sym, entry);
770 			free(sym);
771 		}
772 	}
773 
774 	if (errors)
775 		return (-1);
776 
777 	TAILQ_FOREACH(repo, &gotd->repos, entry) {
778 		if (repo->path[0] == '\0') {
779 			log_warnx("repository \"%s\": no path provided in "
780 			    "configuration file", repo->name);
781 			return (-1);
782 		}
783 	}
784 
785 	if (proc_id == PROC_GOTD && TAILQ_EMPTY(&gotd->repos)) {
786 		log_warnx("no repository defined in configuration file");
787 		return (-1);
788 	}
789 
790 	return (0);
791 }
792 
793 static int
794 uid_connection_limit_cmp(const void *pa, const void *pb)
795 {
796 	const struct gotd_uid_connection_limit *a = pa, *b = pb;
797 
798 	if (a->uid < b->uid)
799 		return -1;
800 	else if (a->uid > b->uid);
801 		return 1;
802 
803 	return 0;
804 }
805 
806 static int
807 conf_limit_user_connections(const char *user, int maximum)
808 {
809 	uid_t uid;
810 	struct gotd_uid_connection_limit *limit;
811 	size_t nlimits;
812 
813 	if (maximum < 1) {
814 		yyerror("max connections cannot be smaller 1");
815 		return -1;
816 	}
817 	if (maximum > GOTD_MAXCLIENTS) {
818 		yyerror("max connections must be <= %d", GOTD_MAXCLIENTS);
819 		return -1;
820 	}
821 
822 	if (gotd_auth_parseuid(user, &uid) == -1) {
823 		yyerror("%s: no such user", user);
824 		return -1;
825 	}
826 
827 	limit = gotd_find_uid_connection_limit(gotd->connection_limits,
828 	    gotd->nconnection_limits, uid);
829 	if (limit) {
830 		limit->max_connections = maximum;
831 		return 0;
832 	}
833 
834 	limit = gotd->connection_limits;
835 	nlimits = gotd->nconnection_limits + 1;
836 	limit = reallocarray(limit, nlimits, sizeof(*limit));
837 	if (limit == NULL)
838 		fatal("reallocarray");
839 
840 	limit[nlimits - 1].uid = uid;
841 	limit[nlimits - 1].max_connections = maximum;
842 
843 	gotd->connection_limits = limit;
844 	gotd->nconnection_limits = nlimits;
845 	qsort(gotd->connection_limits, gotd->nconnection_limits,
846 	    sizeof(gotd->connection_limits[0]), uid_connection_limit_cmp);
847 
848 	return 0;
849 }
850 
851 static struct gotd_repo *
852 conf_new_repo(const char *name)
853 {
854 	struct gotd_repo *repo;
855 
856 	if (name[0] == '\0') {
857 		fatalx("syntax error: empty repository name found in %s",
858 		    file->name);
859 	}
860 
861 	if (strchr(name, '\n') != NULL)
862 		fatalx("repository names must not contain linefeeds: %s", name);
863 
864 	repo = calloc(1, sizeof(*repo));
865 	if (repo == NULL)
866 		fatalx("%s: calloc", __func__);
867 
868 	STAILQ_INIT(&repo->rules);
869 	TAILQ_INIT(&repo->protected_tag_namespaces);
870 	TAILQ_INIT(&repo->protected_branch_namespaces);
871 	TAILQ_INIT(&repo->protected_branches);
872 
873 	if (strlcpy(repo->name, name, sizeof(repo->name)) >=
874 	    sizeof(repo->name))
875 		fatalx("%s: strlcpy", __func__);
876 
877 	TAILQ_INSERT_TAIL(&gotd->repos, repo, entry);
878 	gotd->nrepos++;
879 
880 	return repo;
881 };
882 
883 static void
884 conf_new_access_rule(struct gotd_repo *repo, enum gotd_access access,
885     int authorization, char *identifier)
886 {
887 	struct gotd_access_rule *rule;
888 
889 	rule = calloc(1, sizeof(*rule));
890 	if (rule == NULL)
891 		fatal("calloc");
892 
893 	rule->access = access;
894 	rule->authorization = authorization;
895 	rule->identifier = identifier;
896 
897 	STAILQ_INSERT_TAIL(&repo->rules, rule, entry);
898 }
899 
900 static int
901 refname_is_valid(char *refname)
902 {
903 	if (strlen(refname) < 5 || strncmp(refname, "refs/", 5) != 0) {
904 		yyerror("reference name must begin with \"refs/\": %s",
905 		    refname);
906 		return 0;
907 	}
908 
909 	if (!got_ref_name_is_valid(refname)) {
910 		yyerror("invalid reference name: %s", refname);
911 		return 0;
912 	}
913 
914 	return 1;
915 }
916 
917 static int
918 conf_protect_ref_namespace(struct got_pathlist_head *refs, char *namespace)
919 {
920 	const struct got_error *error;
921 	struct got_pathlist_entry *new;
922 	char *s;
923 
924 	got_path_strip_trailing_slashes(namespace);
925 	if (!refname_is_valid(namespace))
926 		return -1;
927 	if (asprintf(&s, "%s/", namespace) == -1) {
928 		yyerror("asprintf: %s", strerror(errno));
929 		return -1;
930 	}
931 
932 	error = got_pathlist_insert(&new, refs, s, NULL);
933 	if (error || new == NULL) {
934 		free(s);
935 		if (error)
936 			yyerror("got_pathlist_insert: %s", error->msg);
937 		else
938 			yyerror("duplicate protect namespace %s", namespace);
939 		return -1;
940 	}
941 
942 	return 0;
943 }
944 
945 static int
946 conf_protect_tag_namespace(struct gotd_repo *repo, char *namespace)
947 {
948 	return conf_protect_ref_namespace(&repo->protected_tag_namespaces,
949 	    namespace);
950 }
951 
952 static int
953 conf_protect_branch_namespace(struct gotd_repo *repo, char *namespace)
954 {
955 	return conf_protect_ref_namespace(&repo->protected_branch_namespaces,
956 	    namespace);
957 }
958 
959 static int
960 conf_protect_branch(struct gotd_repo *repo, char *branchname)
961 {
962 	const struct got_error *error;
963 	struct got_pathlist_entry *new;
964 	char *refname;
965 
966 	if (strncmp(branchname, "refs/heads/", 11) != 0) {
967 		if (asprintf(&refname, "refs/heads/%s", branchname) == -1) {
968 			yyerror("asprintf: %s", strerror(errno));
969 			return -1;
970 		}
971 	} else {
972 		refname = strdup(branchname);
973 		if (refname == NULL) {
974 			yyerror("strdup: %s", strerror(errno));
975 			return -1;
976 		}
977 	}
978 
979 	if (!refname_is_valid(refname)) {
980 		free(refname);
981 		return -1;
982 	}
983 
984 	error = got_pathlist_insert(&new, &repo->protected_branches,
985 	    refname, NULL);
986 	if (error || new == NULL) {
987 		free(refname);
988 		if (error)
989 			yyerror("got_pathlist_insert: %s", error->msg);
990 		else
991 			yyerror("duplicate protect branch %s", branchname);
992 		return -1;
993 	}
994 
995 	return 0;
996 }
997 
998 int
999 symset(const char *nam, const char *val, int persist)
1000 {
1001 	struct sym *sym;
1002 
1003 	TAILQ_FOREACH(sym, &symhead, entry) {
1004 		if (strcmp(nam, sym->nam) == 0)
1005 			break;
1006 	}
1007 
1008 	if (sym != NULL) {
1009 		if (sym->persist == 1)
1010 			return (0);
1011 		else {
1012 			free(sym->nam);
1013 			free(sym->val);
1014 			TAILQ_REMOVE(&symhead, sym, entry);
1015 			free(sym);
1016 		}
1017 	}
1018 	sym = calloc(1, sizeof(*sym));
1019 	if (sym == NULL)
1020 		return (-1);
1021 
1022 	sym->nam = strdup(nam);
1023 	if (sym->nam == NULL) {
1024 		free(sym);
1025 		return (-1);
1026 	}
1027 	sym->val = strdup(val);
1028 	if (sym->val == NULL) {
1029 		free(sym->nam);
1030 		free(sym);
1031 		return (-1);
1032 	}
1033 	sym->used = 0;
1034 	sym->persist = persist;
1035 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
1036 	return (0);
1037 }
1038 
1039 char *
1040 symget(const char *nam)
1041 {
1042 	struct sym *sym;
1043 
1044 	TAILQ_FOREACH(sym, &symhead, entry) {
1045 		if (strcmp(nam, sym->nam) == 0) {
1046 			sym->used = 1;
1047 			return (sym->val);
1048 		}
1049 	}
1050 	return (NULL);
1051 }
1052 
1053 struct gotd_repo *
1054 gotd_find_repo_by_name(const char *repo_name, struct gotd *gotd)
1055 {
1056 	struct gotd_repo *repo;
1057 	size_t namelen;
1058 
1059 	TAILQ_FOREACH(repo, &gotd->repos, entry) {
1060 		namelen = strlen(repo->name);
1061 		if (strncmp(repo->name, repo_name, namelen) != 0)
1062 			continue;
1063 		if (repo_name[namelen] == '\0' ||
1064 		    strcmp(&repo_name[namelen], ".git") == 0)
1065 			return repo;
1066 	}
1067 
1068 	return NULL;
1069 }
1070 
1071 struct gotd_repo *
1072 gotd_find_repo_by_path(const char *repo_path, struct gotd *gotd)
1073 {
1074 	struct gotd_repo *repo;
1075 
1076 	TAILQ_FOREACH(repo, &gotd->repos, entry) {
1077 		if (strcmp(repo->path, repo_path) == 0)
1078 			return repo;
1079 	}
1080 
1081 	return NULL;
1082 }