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 <stdarg.h>
37 #include <stdlib.h>
38 #include <stdio.h>
39 #include <string.h>
40 #include <syslog.h>
41 #include <unistd.h>
42 
43 #include "got_error.h"
44 #include "got_path.h"
45 #include "got_reference.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, 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 int			 conf_protect_ref_namespace(char **,
95 				    struct got_pathlist_head *, char *);
96 static int			 conf_protect_tag_namespace(struct gotd_repo *,
97 				    char *);
98 static int			 conf_protect_branch_namespace(
99 				    struct gotd_repo *, char *);
100 static int			 conf_protect_branch(struct gotd_repo *,
101 				    char *);
102 static enum gotd_procid		 gotd_proc_id;
103 
104 typedef struct {
105 	union {
106 		long long	 number;
107 		char		*string;
108 		struct timeval	 tv;
109 	} v;
110 	int lineno;
111 } YYSTYPE;
112 
113 %}
114 
115 %token	PATH ERROR LISTEN ON USER REPOSITORY PERMIT DENY
116 %token	RO RW CONNECTION LIMIT REQUEST TIMEOUT
117 %token	PROTECT NAMESPACE BRANCH TAG
118 
119 %token	<v.string>	STRING
120 %token	<v.number>	NUMBER
121 %type	<v.tv>		timeout
122 
123 %%
124 
125 grammar		:
126 		| grammar '\n'
127 		| grammar main '\n'
128 		| grammar repository '\n'
129 		;
130 
131 timeout		: NUMBER {
132 			if ($1 < 0) {
133 				yyerror("invalid timeout: %lld", $1);
134 				YYERROR;
135 			}
136 			$$.tv_sec = $1;
137 			$$.tv_usec = 0;
138 		}
139 		| STRING {
140 			const char	*errstr;
141 			const char	*type = "seconds";
142 			size_t		 len;
143 			int		 mul = 1;
144 
145 			if (*$1 == '\0') {
146 				yyerror("invalid number of seconds: %s", $1);
147 				free($1);
148 				YYERROR;
149 			}
150 
151 			len = strlen($1);
152 			switch ($1[len - 1]) {
153 			case 'S':
154 			case 's':
155 				$1[len - 1] = '\0';
156 				break;
157 			case 'M':
158 			case 'm':
159 				type = "minutes";
160 				mul = 60;
161 				$1[len - 1] = '\0';
162 				break;
163 			case 'H':
164 			case 'h':
165 				type = "hours";
166 				mul = 60 * 60;
167 				$1[len - 1] = '\0';
168 				break;
169 			}
170 
171 			$$.tv_usec = 0;
172 			$$.tv_sec = strtonum($1, 0, INT_MAX / mul, &errstr);
173 			if (errstr) {
174 				yyerror("number of %s is %s: %s", type,
175 				    errstr, $1);
176 				free($1);
177 				YYERROR;
178 			}
179 
180 			$$.tv_sec *= mul;
181 			free($1);
182 		}
183 		;
184 
185 main		: LISTEN ON STRING {
186 			if (!got_path_is_absolute($3))
187 				yyerror("bad unix socket path \"%s\": "
188 				    "must be an absolute path", $3);
189 
190 			if (gotd_proc_id == PROC_LISTEN) {
191 				if (strlcpy(gotd->unix_socket_path, $3,
192 				    sizeof(gotd->unix_socket_path)) >=
193 				    sizeof(gotd->unix_socket_path)) {
194 					yyerror("%s: unix socket path too long",
195 					    __func__);
196 					free($3);
197 					YYERROR;
198 				}
199 			}
200 			free($3);
201 		}
202 		| USER STRING {
203 			if (strlcpy(gotd->user_name, $2,
204 			    sizeof(gotd->user_name)) >=
205 			    sizeof(gotd->user_name)) {
206 				yyerror("%s: user name too long", __func__);
207 				free($2);
208 				YYERROR;
209 			}
210 			free($2);
211 		}
212 		| connection
213 		;
214 
215 connection	: CONNECTION '{' optnl conflags_l '}'
216 		| CONNECTION conflags
217 
218 conflags_l	: conflags optnl conflags_l
219 		| conflags optnl
220 		;
221 
222 conflags	: REQUEST TIMEOUT timeout		{
223 			if ($3.tv_sec <= 0) {
224 				yyerror("invalid timeout: %lld", $3.tv_sec);
225 				YYERROR;
226 			}
227 			memcpy(&gotd->request_timeout, &$3,
228 			    sizeof(gotd->request_timeout));
229 		}
230 		| LIMIT USER STRING NUMBER	{
231 			if (gotd_proc_id == PROC_LISTEN &&
232 			    conf_limit_user_connections($3, $4) == -1) {
233 				free($3);
234 				YYERROR;
235 			}
236 			free($3);
237 		}
238 		;
239 
240 protect		: PROTECT '{' optnl protectflags_l '}'
241 		| PROTECT protectflags
242 
243 protectflags_l	: protectflags optnl protectflags_l
244 		| protectflags optnl
245 		;
246 
247 protectflags	: TAG NAMESPACE STRING {
248 			if (gotd_proc_id == PROC_GOTD ||
249 			    gotd_proc_id == PROC_REPO_WRITE) {
250 				if (conf_protect_tag_namespace(new_repo, $3)) {
251 					free($3);
252 					YYERROR;
253 				}
254 			}
255 			free($3);
256 		}
257 		| BRANCH NAMESPACE STRING {
258 			if (gotd_proc_id == PROC_GOTD ||
259 			    gotd_proc_id == PROC_REPO_WRITE) {
260 				if (conf_protect_branch_namespace(new_repo,
261 				    $3)) {
262 					free($3);
263 					YYERROR;
264 				}
265 			}
266 			free($3);
267 		}
268 		| BRANCH STRING {
269 			if (gotd_proc_id == PROC_GOTD ||
270 			    gotd_proc_id == PROC_REPO_WRITE) {
271 				if (conf_protect_branch(new_repo, $2)) {
272 					free($2);
273 					YYERROR;
274 				}
275 			}
276 			free($2);
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 			} else
324 				free($3);
325 		}
326 		| PERMIT RW STRING {
327 			if (gotd_proc_id == PROC_AUTH) {
328 				conf_new_access_rule(new_repo,
329 				    GOTD_ACCESS_PERMITTED,
330 				    GOTD_AUTH_READ | GOTD_AUTH_WRITE, $3);
331 			} else
332 				free($3);
333 		}
334 		| DENY STRING {
335 			if (gotd_proc_id == PROC_AUTH) {
336 				conf_new_access_rule(new_repo,
337 				    GOTD_ACCESS_DENIED, 0, $2);
338 			} else
339 				free($2);
340 		}
341 		| protect
342 		;
343 
344 repoopts2	: repoopts2 repoopts1 nl
345 		| repoopts1 optnl
346 		;
347 
348 nl		: '\n' optnl
349 		;
350 
351 optnl		: '\n' optnl		/* zero or more newlines */
352 		| /* empty */
353 		;
354 
355 %%
356 
357 struct keywords {
358 	const char	*k_name;
359 	int		 k_val;
360 };
361 
362 int
363 yyerror(const char *fmt, ...)
364 {
365 	va_list ap;
366 	char *msg;
367 
368 	file->errors++;
369 	va_start(ap, fmt);
370 	if (vasprintf(&msg, fmt, ap) == -1)
371 		fatalx("yyerror vasprintf");
372 	va_end(ap);
373 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
374 	free(msg);
375 	return (0);
376 }
377 
378 int
379 kw_cmp(const void *k, const void *e)
380 {
381 	return (strcmp(k, ((const struct keywords *)e)->k_name));
382 }
383 
384 int
385 lookup(char *s)
386 {
387 	/* This has to be sorted always. */
388 	static const struct keywords keywords[] = {
389 		{ "branch",			BRANCH },
390 		{ "connection",			CONNECTION },
391 		{ "deny",			DENY },
392 		{ "limit",			LIMIT },
393 		{ "listen",			LISTEN },
394 		{ "namespace",			NAMESPACE },
395 		{ "on",				ON },
396 		{ "path",			PATH },
397 		{ "permit",			PERMIT },
398 		{ "protect",			PROTECT },
399 		{ "repository",			REPOSITORY },
400 		{ "request",			REQUEST },
401 		{ "ro",				RO },
402 		{ "rw",				RW },
403 		{ "tag",			TAG },
404 		{ "timeout",			TIMEOUT },
405 		{ "user",			USER },
406 	};
407 	const struct keywords *p;
408 
409 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
410 	    sizeof(keywords[0]), kw_cmp);
411 
412 	if (p)
413 		return (p->k_val);
414 	else
415 		return (STRING);
416 }
417 
418 #define MAXPUSHBACK	128
419 
420 unsigned char *parsebuf;
421 int parseindex;
422 unsigned char pushback_buffer[MAXPUSHBACK];
423 int pushback_index = 0;
424 
425 int
426 lgetc(int quotec)
427 {
428 	int c, next;
429 
430 	if (parsebuf) {
431 		/* Read character from the parsebuffer instead of input. */
432 		if (parseindex >= 0) {
433 			c = parsebuf[parseindex++];
434 			if (c != '\0')
435 				return (c);
436 			parsebuf = NULL;
437 		} else
438 			parseindex++;
439 	}
440 
441 	if (pushback_index)
442 		return (pushback_buffer[--pushback_index]);
443 
444 	if (quotec) {
445 		c = getc(file->stream);
446 		if (c == EOF)
447 			yyerror("reached end of file while parsing "
448 			    "quoted string");
449 		return (c);
450 	}
451 
452 	c = getc(file->stream);
453 	while (c == '\\') {
454 		next = getc(file->stream);
455 		if (next != '\n') {
456 			c = next;
457 			break;
458 		}
459 		yylval.lineno = file->lineno;
460 		file->lineno++;
461 		c = getc(file->stream);
462 	}
463 
464 	return (c);
465 }
466 
467 int
468 lungetc(int c)
469 {
470 	if (c == EOF)
471 		return (EOF);
472 	if (parsebuf) {
473 		parseindex--;
474 		if (parseindex >= 0)
475 			return (c);
476 	}
477 	if (pushback_index < MAXPUSHBACK-1)
478 		return (pushback_buffer[pushback_index++] = c);
479 	else
480 		return (EOF);
481 }
482 
483 int
484 findeol(void)
485 {
486 	int c;
487 
488 	parsebuf = NULL;
489 
490 	/* Skip to either EOF or the first real EOL. */
491 	while (1) {
492 		if (pushback_index)
493 			c = pushback_buffer[--pushback_index];
494 		else
495 			c = lgetc(0);
496 		if (c == '\n') {
497 			file->lineno++;
498 			break;
499 		}
500 		if (c == EOF)
501 			break;
502 	}
503 	return (ERROR);
504 }
505 
506 int
507 yylex(void)
508 {
509 	unsigned char buf[8096];
510 	unsigned char *p, *val;
511 	int quotec, next, c;
512 	int token;
513 
514 top:
515 	p = buf;
516 	c = lgetc(0);
517 	while (c == ' ' || c == '\t')
518 		c = lgetc(0); /* nothing */
519 
520 	yylval.lineno = file->lineno;
521 	if (c == '#') {
522 		c = lgetc(0);
523 		while (c != '\n' && c != EOF)
524 			c = lgetc(0); /* nothing */
525 	}
526 	if (c == '$' && parsebuf == NULL) {
527 		while (1) {
528 			c = lgetc(0);
529 			if (c == EOF)
530 				return (0);
531 
532 			if (p + 1 >= buf + sizeof(buf) - 1) {
533 				yyerror("string too long");
534 				return (findeol());
535 			}
536 			if (isalnum(c) || c == '_') {
537 				*p++ = c;
538 				continue;
539 			}
540 			*p = '\0';
541 			lungetc(c);
542 			break;
543 		}
544 		val = symget(buf);
545 		if (val == NULL) {
546 			yyerror("macro '%s' not defined", buf);
547 			return (findeol());
548 		}
549 		parsebuf = val;
550 		parseindex = 0;
551 		goto top;
552 	}
553 
554 	switch (c) {
555 	case '\'':
556 	case '"':
557 		quotec = c;
558 		while (1) {
559 			c = lgetc(quotec);
560 			if (c == EOF)
561 				return (0);
562 			if (c == '\n') {
563 				file->lineno++;
564 				continue;
565 			} else if (c == '\\') {
566 				next = lgetc(quotec);
567 				if (next == EOF)
568 					return (0);
569 				if (next == quotec || c == ' ' || c == '\t')
570 					c = next;
571 				else if (next == '\n') {
572 					file->lineno++;
573 					continue;
574 				} else
575 					lungetc(next);
576 			} else if (c == quotec) {
577 				*p = '\0';
578 				break;
579 			} else if (c == '\0') {
580 				yyerror("syntax error");
581 				return (findeol());
582 			}
583 			if (p + 1 >= buf + sizeof(buf) - 1) {
584 				yyerror("string too long");
585 				return (findeol());
586 			}
587 			*p++ = c;
588 		}
589 		yylval.v.string = strdup(buf);
590 		if (yylval.v.string == NULL)
591 			err(1, "yylex: strdup");
592 		return (STRING);
593 	}
594 
595 #define allowed_to_end_number(x) \
596 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
597 
598 	if (c == '-' || isdigit(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 && isdigit(c));
607 		lungetc(c);
608 		if (p == buf + 1 && buf[0] == '-')
609 			goto nodigits;
610 		if (c == EOF || allowed_to_end_number(c)) {
611 			const char *errstr = NULL;
612 
613 			*p = '\0';
614 			yylval.v.number = strtonum(buf, LLONG_MIN,
615 			    LLONG_MAX, &errstr);
616 			if (errstr) {
617 				yyerror("\"%s\" invalid number: %s",
618 				    buf, errstr);
619 				return (findeol());
620 			}
621 			return (NUMBER);
622 		} else {
623 nodigits:
624 			while (p > buf + 1)
625 				lungetc(*--p);
626 			c = *--p;
627 			if (c == '-')
628 				return (c);
629 		}
630 	}
631 
632 #define allowed_in_string(x) \
633 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
634 	x != '{' && x != '}' && \
635 	x != '!' && x != '=' && x != '#' && \
636 	x != ','))
637 
638 	if (isalnum(c) || c == ':' || c == '_') {
639 		do {
640 			*p++ = c;
641 			if ((unsigned)(p-buf) >= sizeof(buf)) {
642 				yyerror("string too long");
643 				return (findeol());
644 			}
645 			c = lgetc(0);
646 		} while (c != EOF && (allowed_in_string(c)));
647 		lungetc(c);
648 		*p = '\0';
649 		token = lookup(buf);
650 		if (token == STRING) {
651 			yylval.v.string = strdup(buf);
652 			if (yylval.v.string == NULL)
653 				err(1, "yylex: strdup");
654 		}
655 		return (token);
656 	}
657 	if (c == '\n') {
658 		yylval.lineno = file->lineno;
659 		file->lineno++;
660 	}
661 	if (c == EOF)
662 		return (0);
663 	return (c);
664 }
665 
666 int
667 check_file_secrecy(int fd, const char *fname)
668 {
669 	struct stat st;
670 
671 	if (fstat(fd, &st)) {
672 		log_warn("cannot stat %s", fname);
673 		return (-1);
674 	}
675 	if (st.st_uid != 0 && st.st_uid != getuid()) {
676 		log_warnx("%s: owner not root or current user", fname);
677 		return (-1);
678 	}
679 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
680 		log_warnx("%s: group writable or world read/writable", fname);
681 		return (-1);
682 	}
683 	return (0);
684 }
685 
686 struct file *
687 newfile(const char *name, int secret, int required)
688 {
689 	struct file *nfile;
690 
691 	nfile = calloc(1, sizeof(struct file));
692 	if (nfile == NULL) {
693 		log_warn("calloc");
694 		return (NULL);
695 	}
696 	nfile->name = strdup(name);
697 	if (nfile->name == NULL) {
698 		log_warn("strdup");
699 		free(nfile);
700 		return (NULL);
701 	}
702 	nfile->stream = fopen(nfile->name, "r");
703 	if (nfile->stream == NULL) {
704 		if (required)
705 			log_warn("open %s", nfile->name);
706 		free(nfile->name);
707 		free(nfile);
708 		return (NULL);
709 	} else if (secret &&
710 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
711 		fclose(nfile->stream);
712 		free(nfile->name);
713 		free(nfile);
714 		return (NULL);
715 	}
716 	nfile->lineno = 1;
717 	return (nfile);
718 }
719 
720 static void
721 closefile(struct file *xfile)
722 {
723 	fclose(xfile->stream);
724 	free(xfile->name);
725 	free(xfile);
726 }
727 
728 int
729 parse_config(const char *filename, enum gotd_procid proc_id,
730     struct gotd *env, int require_config_file)
731 {
732 	struct sym *sym, *next;
733 	struct gotd_repo *repo;
734 
735 	memset(env, 0, sizeof(*env));
736 
737 	gotd = env;
738 	gotd_proc_id = proc_id;
739 	TAILQ_INIT(&gotd->repos);
740 
741 	/* Apply default values. */
742 	if (strlcpy(gotd->unix_socket_path, GOTD_UNIX_SOCKET,
743 	    sizeof(gotd->unix_socket_path)) >= sizeof(gotd->unix_socket_path)) {
744 		fprintf(stderr, "%s: unix socket path too long", __func__);
745 		return -1;
746 	}
747 	if (strlcpy(gotd->user_name, GOTD_USER,
748 	    sizeof(gotd->user_name)) >= sizeof(gotd->user_name)) {
749 		fprintf(stderr, "%s: user name too long", __func__);
750 		return -1;
751 	}
752 
753 	gotd->request_timeout.tv_sec = GOTD_DEFAULT_REQUEST_TIMEOUT;
754 	gotd->request_timeout.tv_usec = 0;
755 
756 	file = newfile(filename, 0, require_config_file);
757 	if (file == NULL)
758 		return require_config_file ? -1 : 0;
759 
760 	yyparse();
761 	errors = file->errors;
762 	closefile(file);
763 
764 	/* Free macros and check which have not been used. */
765 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
766 		if ((gotd->verbosity > 1) && !sym->used)
767 			fprintf(stderr, "warning: macro '%s' not used\n",
768 			    sym->nam);
769 		if (!sym->persist) {
770 			free(sym->nam);
771 			free(sym->val);
772 			TAILQ_REMOVE(&symhead, sym, entry);
773 			free(sym);
774 		}
775 	}
776 
777 	if (errors)
778 		return (-1);
779 
780 	TAILQ_FOREACH(repo, &gotd->repos, entry) {
781 		if (repo->path[0] == '\0') {
782 			log_warnx("repository \"%s\": no path provided in "
783 			    "configuration file", repo->name);
784 			return (-1);
785 		}
786 	}
787 
788 	if (proc_id == PROC_GOTD && TAILQ_EMPTY(&gotd->repos)) {
789 		log_warnx("no repository defined in configuration file");
790 		return (-1);
791 	}
792 
793 	return (0);
794 }
795 
796 static int
797 uid_connection_limit_cmp(const void *pa, const void *pb)
798 {
799 	const struct gotd_uid_connection_limit *a = pa, *b = pb;
800 
801 	if (a->uid < b->uid)
802 		return -1;
803 	else if (a->uid > b->uid);
804 		return 1;
805 
806 	return 0;
807 }
808 
809 static int
810 conf_limit_user_connections(const char *user, int maximum)
811 {
812 	uid_t uid;
813 	struct gotd_uid_connection_limit *limit;
814 	size_t nlimits;
815 
816 	if (maximum < 1) {
817 		yyerror("max connections cannot be smaller 1");
818 		return -1;
819 	}
820 	if (maximum > GOTD_MAXCLIENTS) {
821 		yyerror("max connections must be <= %d", GOTD_MAXCLIENTS);
822 		return -1;
823 	}
824 
825 	if (gotd_auth_parseuid(user, &uid) == -1) {
826 		yyerror("%s: no such user", user);
827 		return -1;
828 	}
829 
830 	limit = gotd_find_uid_connection_limit(gotd->connection_limits,
831 	    gotd->nconnection_limits, uid);
832 	if (limit) {
833 		limit->max_connections = maximum;
834 		return 0;
835 	}
836 
837 	limit = gotd->connection_limits;
838 	nlimits = gotd->nconnection_limits + 1;
839 	limit = reallocarray(limit, nlimits, sizeof(*limit));
840 	if (limit == NULL)
841 		fatal("reallocarray");
842 
843 	limit[nlimits - 1].uid = uid;
844 	limit[nlimits - 1].max_connections = maximum;
845 
846 	gotd->connection_limits = limit;
847 	gotd->nconnection_limits = nlimits;
848 	qsort(gotd->connection_limits, gotd->nconnection_limits,
849 	    sizeof(gotd->connection_limits[0]), uid_connection_limit_cmp);
850 
851 	return 0;
852 }
853 
854 static struct gotd_repo *
855 conf_new_repo(const char *name)
856 {
857 	struct gotd_repo *repo;
858 
859 	if (name[0] == '\0') {
860 		fatalx("syntax error: empty repository name found in %s",
861 		    file->name);
862 	}
863 
864 	if (strchr(name, '\n') != NULL)
865 		fatalx("repository names must not contain linefeeds: %s", name);
866 
867 	repo = calloc(1, sizeof(*repo));
868 	if (repo == NULL)
869 		fatalx("%s: calloc", __func__);
870 
871 	STAILQ_INIT(&repo->rules);
872 	TAILQ_INIT(&repo->protected_tag_namespaces);
873 	TAILQ_INIT(&repo->protected_branch_namespaces);
874 	TAILQ_INIT(&repo->protected_branches);
875 
876 	if (strlcpy(repo->name, name, sizeof(repo->name)) >=
877 	    sizeof(repo->name))
878 		fatalx("%s: strlcpy", __func__);
879 
880 	TAILQ_INSERT_TAIL(&gotd->repos, repo, entry);
881 	gotd->nrepos++;
882 
883 	return repo;
884 };
885 
886 static void
887 conf_new_access_rule(struct gotd_repo *repo, enum gotd_access access,
888     int authorization, char *identifier)
889 {
890 	struct gotd_access_rule *rule;
891 
892 	rule = calloc(1, sizeof(*rule));
893 	if (rule == NULL)
894 		fatal("calloc");
895 
896 	rule->access = access;
897 	rule->authorization = authorization;
898 	rule->identifier = identifier;
899 
900 	STAILQ_INSERT_TAIL(&repo->rules, rule, entry);
901 }
902 
903 static int
904 refname_is_valid(char *refname)
905 {
906 	if (strlen(refname) < 5 || strncmp(refname, "refs/", 5) != 0) {
907 		yyerror("reference name must begin with \"refs/\": %s",
908 		    refname);
909 		return 0;
910 	}
911 
912 	if (!got_ref_name_is_valid(refname)) {
913 		yyerror("invalid reference name: %s", refname);
914 		return 0;
915 	}
916 
917 	return 1;
918 }
919 
920 static int
921 conf_protect_ref_namespace(char **new, struct got_pathlist_head *refs,
922     char *namespace)
923 {
924 	const struct got_error *error;
925 	struct got_pathlist_entry *pe;
926 	char *s;
927 
928 	*new = NULL;
929 
930 	got_path_strip_trailing_slashes(namespace);
931 	if (!refname_is_valid(namespace))
932 		return -1;
933 	if (asprintf(&s, "%s/", namespace) == -1) {
934 		yyerror("asprintf: %s", strerror(errno));
935 		return -1;
936 	}
937 
938 	error = got_pathlist_insert(&pe, refs, s, NULL);
939 	if (error || pe == NULL) {
940 		free(s);
941 		if (error)
942 			yyerror("got_pathlist_insert: %s", error->msg);
943 		else
944 			yyerror("duplicate protected namespace %s", namespace);
945 		return -1;
946 	}
947 
948 	*new = s;
949 	return 0;
950 }
951 
952 static int
953 conf_protect_tag_namespace(struct gotd_repo *repo, char *namespace)
954 {
955 	struct got_pathlist_entry *pe;
956 	char *new;
957 
958 	if (conf_protect_ref_namespace(&new, &repo->protected_tag_namespaces,
959 	    namespace) == -1)
960 		return -1;
961 
962 	TAILQ_FOREACH(pe, &repo->protected_branch_namespaces, entry) {
963 		if (strcmp(pe->path, new) == 0) {
964 			yyerror("duplicate protected namespace %s", namespace);
965 			return -1;
966 		}
967 	}
968 
969 	return 0;
970 }
971 
972 static int
973 conf_protect_branch_namespace(struct gotd_repo *repo, char *namespace)
974 {
975 	struct got_pathlist_entry *pe;
976 	char *new;
977 
978 	if (conf_protect_ref_namespace(&new,
979 	    &repo->protected_branch_namespaces, namespace) == -1)
980 		return -1;
981 
982 	TAILQ_FOREACH(pe, &repo->protected_tag_namespaces, entry) {
983 		if (strcmp(pe->path, new) == 0) {
984 			yyerror("duplicate protected namespace %s", namespace);
985 			return -1;
986 		}
987 	}
988 
989 	return 0;
990 }
991 
992 static int
993 conf_protect_branch(struct gotd_repo *repo, char *branchname)
994 {
995 	const struct got_error *error;
996 	struct got_pathlist_entry *new;
997 	char *refname;
998 
999 	if (strncmp(branchname, "refs/heads/", 11) != 0) {
1000 		if (asprintf(&refname, "refs/heads/%s", branchname) == -1) {
1001 			yyerror("asprintf: %s", strerror(errno));
1002 			return -1;
1003 		}
1004 	} else {
1005 		refname = strdup(branchname);
1006 		if (refname == NULL) {
1007 			yyerror("strdup: %s", strerror(errno));
1008 			return -1;
1009 		}
1010 	}
1011 
1012 	if (!refname_is_valid(refname)) {
1013 		free(refname);
1014 		return -1;
1015 	}
1016 
1017 	error = got_pathlist_insert(&new, &repo->protected_branches,
1018 	    refname, NULL);
1019 	if (error || new == NULL) {
1020 		free(refname);
1021 		if (error)
1022 			yyerror("got_pathlist_insert: %s", error->msg);
1023 		else
1024 			yyerror("duplicate protect branch %s", branchname);
1025 		return -1;
1026 	}
1027 
1028 	return 0;
1029 }
1030 
1031 int
1032 symset(const char *nam, const char *val, int persist)
1033 {
1034 	struct sym *sym;
1035 
1036 	TAILQ_FOREACH(sym, &symhead, entry) {
1037 		if (strcmp(nam, sym->nam) == 0)
1038 			break;
1039 	}
1040 
1041 	if (sym != NULL) {
1042 		if (sym->persist == 1)
1043 			return (0);
1044 		else {
1045 			free(sym->nam);
1046 			free(sym->val);
1047 			TAILQ_REMOVE(&symhead, sym, entry);
1048 			free(sym);
1049 		}
1050 	}
1051 	sym = calloc(1, sizeof(*sym));
1052 	if (sym == NULL)
1053 		return (-1);
1054 
1055 	sym->nam = strdup(nam);
1056 	if (sym->nam == NULL) {
1057 		free(sym);
1058 		return (-1);
1059 	}
1060 	sym->val = strdup(val);
1061 	if (sym->val == NULL) {
1062 		free(sym->nam);
1063 		free(sym);
1064 		return (-1);
1065 	}
1066 	sym->used = 0;
1067 	sym->persist = persist;
1068 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
1069 	return (0);
1070 }
1071 
1072 char *
1073 symget(const char *nam)
1074 {
1075 	struct sym *sym;
1076 
1077 	TAILQ_FOREACH(sym, &symhead, entry) {
1078 		if (strcmp(nam, sym->nam) == 0) {
1079 			sym->used = 1;
1080 			return (sym->val);
1081 		}
1082 	}
1083 	return (NULL);
1084 }
1085 
1086 struct gotd_repo *
1087 gotd_find_repo_by_name(const char *repo_name, struct gotd *gotd)
1088 {
1089 	struct gotd_repo *repo;
1090 	size_t namelen;
1091 
1092 	TAILQ_FOREACH(repo, &gotd->repos, entry) {
1093 		namelen = strlen(repo->name);
1094 		if (strncmp(repo->name, repo_name, namelen) != 0)
1095 			continue;
1096 		if (repo_name[namelen] == '\0' ||
1097 		    strcmp(&repo_name[namelen], ".git") == 0)
1098 			return repo;
1099 	}
1100 
1101 	return NULL;
1102 }
1103 
1104 struct gotd_repo *
1105 gotd_find_repo_by_path(const char *repo_path, struct gotd *gotd)
1106 {
1107 	struct gotd_repo *repo;
1108 
1109 	TAILQ_FOREACH(repo, &gotd->repos, entry) {
1110 		if (strcmp(repo->path, repo_path) == 0)
1111 			return repo;
1112 	}
1113 
1114 	return NULL;
1115 }