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(char **,
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 			free($3);
258 		}
259 		| BRANCH NAMESPACE STRING {
260 			if (gotd_proc_id == PROC_GOTD ||
261 			    gotd_proc_id == PROC_REPO_WRITE) {
262 				if (conf_protect_branch_namespace(new_repo,
263 				    $3)) {
264 					free($3);
265 					YYERROR;
266 				}
267 			}
268 			free($3);
269 		}
270 		| BRANCH STRING {
271 			if (gotd_proc_id == PROC_GOTD ||
272 			    gotd_proc_id == PROC_REPO_WRITE) {
273 				if (conf_protect_branch(new_repo, $2)) {
274 					free($2);
275 					YYERROR;
276 				}
277 			}
278 			free($2);
279 		}
280 		;
281 
282 repository	: REPOSITORY STRING {
283 			struct gotd_repo *repo;
284 
285 			TAILQ_FOREACH(repo, &gotd->repos, entry) {
286 				if (strcmp(repo->name, $2) == 0) {
287 					yyerror("duplicate repository '%s'", $2);
288 					free($2);
289 					YYERROR;
290 				}
291 			}
292 
293 			if (gotd_proc_id == PROC_GOTD ||
294 			    gotd_proc_id == PROC_AUTH ||
295 			    gotd_proc_id == PROC_REPO_WRITE) {
296 				new_repo = conf_new_repo($2);
297 			}
298 			free($2);
299 		} '{' optnl repoopts2 '}' {
300 		}
301 		;
302 
303 repoopts1	: PATH STRING {
304 			if (gotd_proc_id == PROC_GOTD ||
305 			    gotd_proc_id == PROC_AUTH ||
306 			    gotd_proc_id == PROC_REPO_WRITE) {
307 				if (!got_path_is_absolute($2)) {
308 					yyerror("%s: path %s is not absolute",
309 					    __func__, $2);
310 					free($2);
311 					YYERROR;
312 				}
313 				if (realpath($2, new_repo->path) == NULL) {
314 					yyerror("realpath %s: %s", $2,
315 					    strerror(errno));
316 					/*
317 					 * Give admin a chance to create
318 					 * missing repositories at run-time.
319 					 */
320 					if (errno != ENOENT) {
321 						free($2);
322 						YYERROR;
323 					} else if (strlcpy(new_repo->path, $2,
324 					    sizeof(new_repo->path)) >=
325 					    sizeof(new_repo->path))
326 						yyerror("path too long");
327 				}
328 			}
329 			free($2);
330 		}
331 		| PERMIT RO STRING {
332 			if (gotd_proc_id == PROC_AUTH) {
333 				conf_new_access_rule(new_repo,
334 				    GOTD_ACCESS_PERMITTED, GOTD_AUTH_READ, $3);
335 			} else
336 				free($3);
337 		}
338 		| PERMIT RW STRING {
339 			if (gotd_proc_id == PROC_AUTH) {
340 				conf_new_access_rule(new_repo,
341 				    GOTD_ACCESS_PERMITTED,
342 				    GOTD_AUTH_READ | GOTD_AUTH_WRITE, $3);
343 			} else
344 				free($3);
345 		}
346 		| DENY STRING {
347 			if (gotd_proc_id == PROC_AUTH) {
348 				conf_new_access_rule(new_repo,
349 				    GOTD_ACCESS_DENIED, 0, $2);
350 			} else
351 				free($2);
352 		}
353 		| protect
354 		;
355 
356 repoopts2	: repoopts2 repoopts1 nl
357 		| repoopts1 optnl
358 		;
359 
360 nl		: '\n' optnl
361 		;
362 
363 optnl		: '\n' optnl		/* zero or more newlines */
364 		| /* empty */
365 		;
366 
367 %%
368 
369 struct keywords {
370 	const char	*k_name;
371 	int		 k_val;
372 };
373 
374 int
375 yyerror(const char *fmt, ...)
376 {
377 	va_list ap;
378 	char *msg;
379 
380 	file->errors++;
381 	va_start(ap, fmt);
382 	if (vasprintf(&msg, fmt, ap) == -1)
383 		fatalx("yyerror vasprintf");
384 	va_end(ap);
385 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
386 	free(msg);
387 	return (0);
388 }
389 
390 int
391 kw_cmp(const void *k, const void *e)
392 {
393 	return (strcmp(k, ((const struct keywords *)e)->k_name));
394 }
395 
396 int
397 lookup(char *s)
398 {
399 	/* This has to be sorted always. */
400 	static const struct keywords keywords[] = {
401 		{ "branch",			BRANCH },
402 		{ "connection",			CONNECTION },
403 		{ "deny",			DENY },
404 		{ "limit",			LIMIT },
405 		{ "listen",			LISTEN },
406 		{ "namespace",			NAMESPACE },
407 		{ "on",				ON },
408 		{ "path",			PATH },
409 		{ "permit",			PERMIT },
410 		{ "protect",			PROTECT },
411 		{ "repository",			REPOSITORY },
412 		{ "request",			REQUEST },
413 		{ "ro",				RO },
414 		{ "rw",				RW },
415 		{ "tag",			TAG },
416 		{ "timeout",			TIMEOUT },
417 		{ "user",			USER },
418 	};
419 	const struct keywords *p;
420 
421 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
422 	    sizeof(keywords[0]), kw_cmp);
423 
424 	if (p)
425 		return (p->k_val);
426 	else
427 		return (STRING);
428 }
429 
430 #define MAXPUSHBACK	128
431 
432 unsigned char *parsebuf;
433 int parseindex;
434 unsigned char pushback_buffer[MAXPUSHBACK];
435 int pushback_index = 0;
436 
437 int
438 lgetc(int quotec)
439 {
440 	int c, next;
441 
442 	if (parsebuf) {
443 		/* Read character from the parsebuffer instead of input. */
444 		if (parseindex >= 0) {
445 			c = parsebuf[parseindex++];
446 			if (c != '\0')
447 				return (c);
448 			parsebuf = NULL;
449 		} else
450 			parseindex++;
451 	}
452 
453 	if (pushback_index)
454 		return (pushback_buffer[--pushback_index]);
455 
456 	if (quotec) {
457 		c = getc(file->stream);
458 		if (c == EOF)
459 			yyerror("reached end of file while parsing "
460 			    "quoted string");
461 		return (c);
462 	}
463 
464 	c = getc(file->stream);
465 	while (c == '\\') {
466 		next = getc(file->stream);
467 		if (next != '\n') {
468 			c = next;
469 			break;
470 		}
471 		yylval.lineno = file->lineno;
472 		file->lineno++;
473 		c = getc(file->stream);
474 	}
475 
476 	return (c);
477 }
478 
479 int
480 lungetc(int c)
481 {
482 	if (c == EOF)
483 		return (EOF);
484 	if (parsebuf) {
485 		parseindex--;
486 		if (parseindex >= 0)
487 			return (c);
488 	}
489 	if (pushback_index < MAXPUSHBACK-1)
490 		return (pushback_buffer[pushback_index++] = c);
491 	else
492 		return (EOF);
493 }
494 
495 int
496 findeol(void)
497 {
498 	int c;
499 
500 	parsebuf = NULL;
501 
502 	/* Skip to either EOF or the first real EOL. */
503 	while (1) {
504 		if (pushback_index)
505 			c = pushback_buffer[--pushback_index];
506 		else
507 			c = lgetc(0);
508 		if (c == '\n') {
509 			file->lineno++;
510 			break;
511 		}
512 		if (c == EOF)
513 			break;
514 	}
515 	return (ERROR);
516 }
517 
518 int
519 yylex(void)
520 {
521 	unsigned char buf[8096];
522 	unsigned char *p, *val;
523 	int quotec, next, c;
524 	int token;
525 
526 top:
527 	p = buf;
528 	c = lgetc(0);
529 	while (c == ' ' || c == '\t')
530 		c = lgetc(0); /* nothing */
531 
532 	yylval.lineno = file->lineno;
533 	if (c == '#') {
534 		c = lgetc(0);
535 		while (c != '\n' && c != EOF)
536 			c = lgetc(0); /* nothing */
537 	}
538 	if (c == '$' && parsebuf == NULL) {
539 		while (1) {
540 			c = lgetc(0);
541 			if (c == EOF)
542 				return (0);
543 
544 			if (p + 1 >= buf + sizeof(buf) - 1) {
545 				yyerror("string too long");
546 				return (findeol());
547 			}
548 			if (isalnum(c) || c == '_') {
549 				*p++ = c;
550 				continue;
551 			}
552 			*p = '\0';
553 			lungetc(c);
554 			break;
555 		}
556 		val = symget(buf);
557 		if (val == NULL) {
558 			yyerror("macro '%s' not defined", buf);
559 			return (findeol());
560 		}
561 		parsebuf = val;
562 		parseindex = 0;
563 		goto top;
564 	}
565 
566 	switch (c) {
567 	case '\'':
568 	case '"':
569 		quotec = c;
570 		while (1) {
571 			c = lgetc(quotec);
572 			if (c == EOF)
573 				return (0);
574 			if (c == '\n') {
575 				file->lineno++;
576 				continue;
577 			} else if (c == '\\') {
578 				next = lgetc(quotec);
579 				if (next == EOF)
580 					return (0);
581 				if (next == quotec || c == ' ' || c == '\t')
582 					c = next;
583 				else if (next == '\n') {
584 					file->lineno++;
585 					continue;
586 				} else
587 					lungetc(next);
588 			} else if (c == quotec) {
589 				*p = '\0';
590 				break;
591 			} else if (c == '\0') {
592 				yyerror("syntax error");
593 				return (findeol());
594 			}
595 			if (p + 1 >= buf + sizeof(buf) - 1) {
596 				yyerror("string too long");
597 				return (findeol());
598 			}
599 			*p++ = c;
600 		}
601 		yylval.v.string = strdup(buf);
602 		if (yylval.v.string == NULL)
603 			err(1, "yylex: strdup");
604 		return (STRING);
605 	}
606 
607 #define allowed_to_end_number(x) \
608 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
609 
610 	if (c == '-' || isdigit(c)) {
611 		do {
612 			*p++ = c;
613 			if ((unsigned)(p-buf) >= sizeof(buf)) {
614 				yyerror("string too long");
615 				return (findeol());
616 			}
617 			c = lgetc(0);
618 		} while (c != EOF && isdigit(c));
619 		lungetc(c);
620 		if (p == buf + 1 && buf[0] == '-')
621 			goto nodigits;
622 		if (c == EOF || allowed_to_end_number(c)) {
623 			const char *errstr = NULL;
624 
625 			*p = '\0';
626 			yylval.v.number = strtonum(buf, LLONG_MIN,
627 			    LLONG_MAX, &errstr);
628 			if (errstr) {
629 				yyerror("\"%s\" invalid number: %s",
630 				    buf, errstr);
631 				return (findeol());
632 			}
633 			return (NUMBER);
634 		} else {
635 nodigits:
636 			while (p > buf + 1)
637 				lungetc(*--p);
638 			c = *--p;
639 			if (c == '-')
640 				return (c);
641 		}
642 	}
643 
644 #define allowed_in_string(x) \
645 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
646 	x != '{' && x != '}' && \
647 	x != '!' && x != '=' && x != '#' && \
648 	x != ','))
649 
650 	if (isalnum(c) || c == ':' || c == '_') {
651 		do {
652 			*p++ = c;
653 			if ((unsigned)(p-buf) >= sizeof(buf)) {
654 				yyerror("string too long");
655 				return (findeol());
656 			}
657 			c = lgetc(0);
658 		} while (c != EOF && (allowed_in_string(c)));
659 		lungetc(c);
660 		*p = '\0';
661 		token = lookup(buf);
662 		if (token == STRING) {
663 			yylval.v.string = strdup(buf);
664 			if (yylval.v.string == NULL)
665 				err(1, "yylex: strdup");
666 		}
667 		return (token);
668 	}
669 	if (c == '\n') {
670 		yylval.lineno = file->lineno;
671 		file->lineno++;
672 	}
673 	if (c == EOF)
674 		return (0);
675 	return (c);
676 }
677 
678 int
679 check_file_secrecy(int fd, const char *fname)
680 {
681 	struct stat st;
682 
683 	if (fstat(fd, &st)) {
684 		log_warn("cannot stat %s", fname);
685 		return (-1);
686 	}
687 	if (st.st_uid != 0 && st.st_uid != getuid()) {
688 		log_warnx("%s: owner not root or current user", fname);
689 		return (-1);
690 	}
691 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
692 		log_warnx("%s: group writable or world read/writable", fname);
693 		return (-1);
694 	}
695 	return (0);
696 }
697 
698 struct file *
699 newfile(const char *name, int secret, int required)
700 {
701 	struct file *nfile;
702 
703 	nfile = calloc(1, sizeof(struct file));
704 	if (nfile == NULL) {
705 		log_warn("calloc");
706 		return (NULL);
707 	}
708 	nfile->name = strdup(name);
709 	if (nfile->name == NULL) {
710 		log_warn("strdup");
711 		free(nfile);
712 		return (NULL);
713 	}
714 	nfile->stream = fopen(nfile->name, "r");
715 	if (nfile->stream == NULL) {
716 		if (required)
717 			log_warn("open %s", nfile->name);
718 		free(nfile->name);
719 		free(nfile);
720 		return (NULL);
721 	} else if (secret &&
722 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
723 		fclose(nfile->stream);
724 		free(nfile->name);
725 		free(nfile);
726 		return (NULL);
727 	}
728 	nfile->lineno = 1;
729 	return (nfile);
730 }
731 
732 static void
733 closefile(struct file *xfile)
734 {
735 	fclose(xfile->stream);
736 	free(xfile->name);
737 	free(xfile);
738 }
739 
740 int
741 parse_config(const char *filename, enum gotd_procid proc_id,
742     struct gotd *env, int require_config_file)
743 {
744 	struct sym *sym, *next;
745 	struct gotd_repo *repo;
746 
747 	memset(env, 0, sizeof(*env));
748 
749 	gotd = env;
750 	gotd_proc_id = proc_id;
751 	TAILQ_INIT(&gotd->repos);
752 
753 	/* Apply default values. */
754 	if (strlcpy(gotd->unix_socket_path, GOTD_UNIX_SOCKET,
755 	    sizeof(gotd->unix_socket_path)) >= sizeof(gotd->unix_socket_path)) {
756 		fprintf(stderr, "%s: unix socket path too long", __func__);
757 		return -1;
758 	}
759 	if (strlcpy(gotd->user_name, GOTD_USER,
760 	    sizeof(gotd->user_name)) >= sizeof(gotd->user_name)) {
761 		fprintf(stderr, "%s: user name too long", __func__);
762 		return -1;
763 	}
764 
765 	gotd->request_timeout.tv_sec = GOTD_DEFAULT_REQUEST_TIMEOUT;
766 	gotd->request_timeout.tv_usec = 0;
767 
768 	file = newfile(filename, 0, require_config_file);
769 	if (file == NULL)
770 		return require_config_file ? -1 : 0;
771 
772 	yyparse();
773 	errors = file->errors;
774 	closefile(file);
775 
776 	/* Free macros and check which have not been used. */
777 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
778 		if ((gotd->verbosity > 1) && !sym->used)
779 			fprintf(stderr, "warning: macro '%s' not used\n",
780 			    sym->nam);
781 		if (!sym->persist) {
782 			free(sym->nam);
783 			free(sym->val);
784 			TAILQ_REMOVE(&symhead, sym, entry);
785 			free(sym);
786 		}
787 	}
788 
789 	if (errors)
790 		return (-1);
791 
792 	TAILQ_FOREACH(repo, &gotd->repos, entry) {
793 		if (repo->path[0] == '\0') {
794 			log_warnx("repository \"%s\": no path provided in "
795 			    "configuration file", repo->name);
796 			return (-1);
797 		}
798 	}
799 
800 	if (proc_id == PROC_GOTD && TAILQ_EMPTY(&gotd->repos)) {
801 		log_warnx("no repository defined in configuration file");
802 		return (-1);
803 	}
804 
805 	return (0);
806 }
807 
808 static int
809 uid_connection_limit_cmp(const void *pa, const void *pb)
810 {
811 	const struct gotd_uid_connection_limit *a = pa, *b = pb;
812 
813 	if (a->uid < b->uid)
814 		return -1;
815 	else if (a->uid > b->uid);
816 		return 1;
817 
818 	return 0;
819 }
820 
821 static int
822 conf_limit_user_connections(const char *user, int maximum)
823 {
824 	uid_t uid;
825 	struct gotd_uid_connection_limit *limit;
826 	size_t nlimits;
827 
828 	if (maximum < 1) {
829 		yyerror("max connections cannot be smaller 1");
830 		return -1;
831 	}
832 	if (maximum > GOTD_MAXCLIENTS) {
833 		yyerror("max connections must be <= %d", GOTD_MAXCLIENTS);
834 		return -1;
835 	}
836 
837 	if (gotd_auth_parseuid(user, &uid) == -1) {
838 		yyerror("%s: no such user", user);
839 		return -1;
840 	}
841 
842 	limit = gotd_find_uid_connection_limit(gotd->connection_limits,
843 	    gotd->nconnection_limits, uid);
844 	if (limit) {
845 		limit->max_connections = maximum;
846 		return 0;
847 	}
848 
849 	limit = gotd->connection_limits;
850 	nlimits = gotd->nconnection_limits + 1;
851 	limit = reallocarray(limit, nlimits, sizeof(*limit));
852 	if (limit == NULL)
853 		fatal("reallocarray");
854 
855 	limit[nlimits - 1].uid = uid;
856 	limit[nlimits - 1].max_connections = maximum;
857 
858 	gotd->connection_limits = limit;
859 	gotd->nconnection_limits = nlimits;
860 	qsort(gotd->connection_limits, gotd->nconnection_limits,
861 	    sizeof(gotd->connection_limits[0]), uid_connection_limit_cmp);
862 
863 	return 0;
864 }
865 
866 static struct gotd_repo *
867 conf_new_repo(const char *name)
868 {
869 	struct gotd_repo *repo;
870 
871 	if (name[0] == '\0') {
872 		fatalx("syntax error: empty repository name found in %s",
873 		    file->name);
874 	}
875 
876 	if (strchr(name, '\n') != NULL)
877 		fatalx("repository names must not contain linefeeds: %s", name);
878 
879 	repo = calloc(1, sizeof(*repo));
880 	if (repo == NULL)
881 		fatalx("%s: calloc", __func__);
882 
883 	STAILQ_INIT(&repo->rules);
884 	TAILQ_INIT(&repo->protected_tag_namespaces);
885 	TAILQ_INIT(&repo->protected_branch_namespaces);
886 	TAILQ_INIT(&repo->protected_branches);
887 
888 	if (strlcpy(repo->name, name, sizeof(repo->name)) >=
889 	    sizeof(repo->name))
890 		fatalx("%s: strlcpy", __func__);
891 
892 	TAILQ_INSERT_TAIL(&gotd->repos, repo, entry);
893 	gotd->nrepos++;
894 
895 	return repo;
896 };
897 
898 static void
899 conf_new_access_rule(struct gotd_repo *repo, enum gotd_access access,
900     int authorization, char *identifier)
901 {
902 	struct gotd_access_rule *rule;
903 
904 	rule = calloc(1, sizeof(*rule));
905 	if (rule == NULL)
906 		fatal("calloc");
907 
908 	rule->access = access;
909 	rule->authorization = authorization;
910 	rule->identifier = identifier;
911 
912 	STAILQ_INSERT_TAIL(&repo->rules, rule, entry);
913 }
914 
915 static int
916 refname_is_valid(char *refname)
917 {
918 	if (strlen(refname) < 5 || strncmp(refname, "refs/", 5) != 0) {
919 		yyerror("reference name must begin with \"refs/\": %s",
920 		    refname);
921 		return 0;
922 	}
923 
924 	if (!got_ref_name_is_valid(refname)) {
925 		yyerror("invalid reference name: %s", refname);
926 		return 0;
927 	}
928 
929 	return 1;
930 }
931 
932 static int
933 conf_protect_ref_namespace(char **new, struct got_pathlist_head *refs,
934     char *namespace)
935 {
936 	const struct got_error *error;
937 	struct got_pathlist_entry *pe;
938 	char *s;
939 
940 	*new = NULL;
941 
942 	got_path_strip_trailing_slashes(namespace);
943 	if (!refname_is_valid(namespace))
944 		return -1;
945 	if (asprintf(&s, "%s/", namespace) == -1) {
946 		yyerror("asprintf: %s", strerror(errno));
947 		return -1;
948 	}
949 
950 	error = got_pathlist_insert(&pe, refs, s, NULL);
951 	if (error || pe == NULL) {
952 		free(s);
953 		if (error)
954 			yyerror("got_pathlist_insert: %s", error->msg);
955 		else
956 			yyerror("duplicate protected namespace %s", namespace);
957 		return -1;
958 	}
959 
960 	*new = s;
961 	return 0;
962 }
963 
964 static int
965 conf_protect_tag_namespace(struct gotd_repo *repo, char *namespace)
966 {
967 	struct got_pathlist_entry *pe;
968 	char *new;
969 
970 	if (conf_protect_ref_namespace(&new, &repo->protected_tag_namespaces,
971 	    namespace) == -1)
972 		return -1;
973 
974 	TAILQ_FOREACH(pe, &repo->protected_branch_namespaces, entry) {
975 		if (strcmp(pe->path, new) == 0) {
976 			yyerror("duplicate protected namespace %s", namespace);
977 			return -1;
978 		}
979 	}
980 
981 	return 0;
982 }
983 
984 static int
985 conf_protect_branch_namespace(struct gotd_repo *repo, char *namespace)
986 {
987 	struct got_pathlist_entry *pe;
988 	char *new;
989 
990 	if (conf_protect_ref_namespace(&new,
991 	    &repo->protected_branch_namespaces, namespace) == -1)
992 		return -1;
993 
994 	TAILQ_FOREACH(pe, &repo->protected_tag_namespaces, entry) {
995 		if (strcmp(pe->path, new) == 0) {
996 			yyerror("duplicate protected namespace %s", namespace);
997 			return -1;
998 		}
999 	}
1000 
1001 	return 0;
1002 }
1003 
1004 static int
1005 conf_protect_branch(struct gotd_repo *repo, char *branchname)
1006 {
1007 	const struct got_error *error;
1008 	struct got_pathlist_entry *new;
1009 	char *refname;
1010 
1011 	if (strncmp(branchname, "refs/heads/", 11) != 0) {
1012 		if (asprintf(&refname, "refs/heads/%s", branchname) == -1) {
1013 			yyerror("asprintf: %s", strerror(errno));
1014 			return -1;
1015 		}
1016 	} else {
1017 		refname = strdup(branchname);
1018 		if (refname == NULL) {
1019 			yyerror("strdup: %s", strerror(errno));
1020 			return -1;
1021 		}
1022 	}
1023 
1024 	if (!refname_is_valid(refname)) {
1025 		free(refname);
1026 		return -1;
1027 	}
1028 
1029 	error = got_pathlist_insert(&new, &repo->protected_branches,
1030 	    refname, NULL);
1031 	if (error || new == NULL) {
1032 		free(refname);
1033 		if (error)
1034 			yyerror("got_pathlist_insert: %s", error->msg);
1035 		else
1036 			yyerror("duplicate protect branch %s", branchname);
1037 		return -1;
1038 	}
1039 
1040 	return 0;
1041 }
1042 
1043 int
1044 symset(const char *nam, const char *val, int persist)
1045 {
1046 	struct sym *sym;
1047 
1048 	TAILQ_FOREACH(sym, &symhead, entry) {
1049 		if (strcmp(nam, sym->nam) == 0)
1050 			break;
1051 	}
1052 
1053 	if (sym != NULL) {
1054 		if (sym->persist == 1)
1055 			return (0);
1056 		else {
1057 			free(sym->nam);
1058 			free(sym->val);
1059 			TAILQ_REMOVE(&symhead, sym, entry);
1060 			free(sym);
1061 		}
1062 	}
1063 	sym = calloc(1, sizeof(*sym));
1064 	if (sym == NULL)
1065 		return (-1);
1066 
1067 	sym->nam = strdup(nam);
1068 	if (sym->nam == NULL) {
1069 		free(sym);
1070 		return (-1);
1071 	}
1072 	sym->val = strdup(val);
1073 	if (sym->val == NULL) {
1074 		free(sym->nam);
1075 		free(sym);
1076 		return (-1);
1077 	}
1078 	sym->used = 0;
1079 	sym->persist = persist;
1080 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
1081 	return (0);
1082 }
1083 
1084 char *
1085 symget(const char *nam)
1086 {
1087 	struct sym *sym;
1088 
1089 	TAILQ_FOREACH(sym, &symhead, entry) {
1090 		if (strcmp(nam, sym->nam) == 0) {
1091 			sym->used = 1;
1092 			return (sym->val);
1093 		}
1094 	}
1095 	return (NULL);
1096 }
1097 
1098 struct gotd_repo *
1099 gotd_find_repo_by_name(const char *repo_name, struct gotd *gotd)
1100 {
1101 	struct gotd_repo *repo;
1102 	size_t namelen;
1103 
1104 	TAILQ_FOREACH(repo, &gotd->repos, entry) {
1105 		namelen = strlen(repo->name);
1106 		if (strncmp(repo->name, repo_name, namelen) != 0)
1107 			continue;
1108 		if (repo_name[namelen] == '\0' ||
1109 		    strcmp(&repo_name[namelen], ".git") == 0)
1110 			return repo;
1111 	}
1112 
1113 	return NULL;
1114 }
1115 
1116 struct gotd_repo *
1117 gotd_find_repo_by_path(const char *repo_path, struct gotd *gotd)
1118 {
1119 	struct gotd_repo *repo;
1120 
1121 	TAILQ_FOREACH(repo, &gotd->repos, entry) {
1122 		if (strcmp(repo->path, repo_path) == 0)
1123 			return repo;
1124 	}
1125 
1126 	return NULL;
1127 }