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