1 /*
2  * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/types.h>
18 #include <sys/stat.h>
19 #include <sys/queue.h>
20 #include <sys/uio.h>
21 #include <sys/socket.h>
22 #include <sys/wait.h>
23 
24 #include <errno.h>
25 #include <fcntl.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <stdint.h>
30 #include <sha1.h>
31 #include <zlib.h>
32 #include <ctype.h>
33 #include <limits.h>
34 #include <imsg.h>
35 
36 #include "got_error.h"
37 #include "got_object.h"
38 #include "got_repository.h"
39 #include "got_opentemp.h"
40 
41 #include "got_lib_sha1.h"
42 #include "got_lib_delta.h"
43 #include "got_lib_pack.h"
44 #include "got_lib_path.h"
45 #include "got_lib_zbuf.h"
46 #include "got_lib_object.h"
47 #include "got_lib_privsep.h"
48 
49 #ifndef MIN
50 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
51 #endif
52 
53 #ifndef nitems
54 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
55 #endif
56 
57 #define GOT_OBJ_TAG_COMMIT	"commit"
58 #define GOT_OBJ_TAG_TREE	"tree"
59 #define GOT_OBJ_TAG_BLOB	"blob"
60 
61 #define GOT_COMMIT_TAG_TREE		"tree "
62 #define GOT_COMMIT_TAG_PARENT		"parent "
63 #define GOT_COMMIT_TAG_AUTHOR		"author "
64 #define GOT_COMMIT_TAG_COMMITTER	"committer "
65 
66 const struct got_error *
67 got_object_id_str(char **outbuf, struct got_object_id *id)
68 {
69 	static const size_t len = SHA1_DIGEST_STRING_LENGTH;
70 
71 	*outbuf = calloc(1, len);
72 	if (*outbuf == NULL)
73 		return got_error_from_errno();
74 
75 	if (got_sha1_digest_to_str(id->sha1, *outbuf, len) == NULL) {
76 		free(*outbuf);
77 		*outbuf = NULL;
78 		return got_error(GOT_ERR_BAD_OBJ_ID_STR);
79 	}
80 
81 	return NULL;
82 }
83 
84 int
85 got_object_id_cmp(struct got_object_id *id1, struct got_object_id *id2)
86 {
87 	return memcmp(id1->sha1, id2->sha1, SHA1_DIGEST_LENGTH);
88 }
89 
90 struct got_object_id *
91 got_object_id_dup(struct got_object_id *id1)
92 {
93 	struct got_object_id *id2;
94 
95 	id2 = malloc(sizeof(*id2));
96 	if (id2 == NULL)
97 		return NULL;
98 	memcpy(id2, id1, sizeof(*id2));
99 	return id2;
100 }
101 
102 struct got_object_id *
103 got_object_get_id(struct got_object *obj)
104 {
105 	return got_object_id_dup(&obj->id);
106 }
107 
108 const struct got_error *
109 got_object_get_id_str(char **outbuf, struct got_object *obj)
110 {
111 	return got_object_id_str(outbuf, &obj->id);
112 }
113 
114 int
115 got_object_get_type(struct got_object *obj)
116 {
117 	switch (obj->type) {
118 	case GOT_OBJ_TYPE_COMMIT:
119 	case GOT_OBJ_TYPE_TREE:
120 	case GOT_OBJ_TYPE_BLOB:
121 	case GOT_OBJ_TYPE_TAG:
122 		return obj->type;
123 	default:
124 		abort();
125 		break;
126 	}
127 
128 	/* not reached */
129 	return 0;
130 }
131 
132 static const struct got_error *
133 parse_object_header(struct got_object **obj, char *buf, size_t len)
134 {
135 	const char *obj_tags[] = {
136 		GOT_OBJ_TAG_COMMIT,
137 		GOT_OBJ_TAG_TREE,
138 		GOT_OBJ_TAG_BLOB
139 	};
140 	const int obj_types[] = {
141 		GOT_OBJ_TYPE_COMMIT,
142 		GOT_OBJ_TYPE_TREE,
143 		GOT_OBJ_TYPE_BLOB,
144 	};
145 	int type = 0;
146 	size_t size = 0, hdrlen = 0;
147 	int i;
148 	char *p = strchr(buf, '\0');
149 
150 	if (p == NULL)
151 		return got_error(GOT_ERR_BAD_OBJ_HDR);
152 
153 	hdrlen = strlen(buf) + 1 /* '\0' */;
154 
155 	for (i = 0; i < nitems(obj_tags); i++) {
156 		const char *tag = obj_tags[i];
157 		size_t tlen = strlen(tag);
158 		const char *errstr;
159 
160 		if (strncmp(buf, tag, tlen) != 0)
161 			continue;
162 
163 		type = obj_types[i];
164 		if (len <= tlen)
165 			return got_error(GOT_ERR_BAD_OBJ_HDR);
166 		size = strtonum(buf + tlen, 0, LONG_MAX, &errstr);
167 		if (errstr != NULL)
168 			return got_error(GOT_ERR_BAD_OBJ_HDR);
169 		break;
170 	}
171 
172 	if (type == 0)
173 		return got_error(GOT_ERR_BAD_OBJ_HDR);
174 
175 	*obj = calloc(1, sizeof(**obj));
176 	if (*obj == NULL)
177 		return got_error_from_errno();
178 	(*obj)->type = type;
179 	(*obj)->hdrlen = hdrlen;
180 	(*obj)->size = size;
181 	return NULL;
182 }
183 
184 static const struct got_error *
185 read_object_header(struct got_object **obj, FILE *f)
186 {
187 	const struct got_error *err;
188 	struct got_zstream_buf zb;
189 	char *buf;
190 	const size_t zbsize = 64;
191 	size_t outlen, totlen;
192 	int i;
193 
194 	buf = calloc(zbsize, sizeof(char));
195 	if (buf == NULL)
196 		return got_error_from_errno();
197 
198 	err = got_inflate_init(&zb, NULL, zbsize);
199 	if (err)
200 		return err;
201 
202 	i = 0;
203 	totlen = 0;
204 	do {
205 		err = got_inflate_read(&zb, f, &outlen);
206 		if (err)
207 			goto done;
208 		if (strchr(zb.outbuf, '\0') == NULL) {
209 			buf = recallocarray(buf, 1 + i, 2 + i, zbsize);
210 			if (buf == NULL) {
211 				err = got_error_from_errno();
212 				goto done;
213 			}
214 		}
215 		memcpy(buf + totlen, zb.outbuf, outlen);
216 		totlen += outlen;
217 		i++;
218 	} while (strchr(zb.outbuf, '\0') == NULL);
219 
220 	err = parse_object_header(obj, buf, totlen);
221 done:
222 	got_inflate_end(&zb);
223 	return err;
224 }
225 
226 static void
227 read_object_header_privsep_child(int obj_fd, int imsg_fds[2])
228 {
229 	const struct got_error *err = NULL;
230 	struct got_object *obj = NULL;
231 	struct imsgbuf ibuf;
232 	FILE *f = NULL;
233 	int status = 0;
234 
235 	setproctitle("read object header");
236 	close(imsg_fds[0]);
237 	imsg_init(&ibuf, imsg_fds[1]);
238 
239 	/* revoke access to most system calls */
240 	if (pledge("stdio", NULL) == -1) {
241 		err = got_error_from_errno();
242 		goto done;
243 	}
244 
245 	f = fdopen(obj_fd, "rb");
246 	if (f == NULL) {
247 		err = got_error_from_errno();
248 		close(obj_fd);
249 		goto done;
250 	}
251 
252 	err = read_object_header(&obj, f);
253 	if (err)
254 		goto done;
255 
256 	err = got_privsep_send_obj(&ibuf, obj, 0);
257 done:
258 	if (obj)
259 		got_object_close(obj);
260 	if (err) {
261 		got_privsep_send_error(&ibuf, err);
262 		status = 1;
263 	}
264 	if (f)
265 		fclose(f);
266 	imsg_clear(&ibuf);
267 	close(imsg_fds[1]);
268 	_exit(status);
269 }
270 
271 static const struct got_error *
272 wait_for_child(pid_t pid)
273 {
274 	int child_status;
275 
276 	waitpid(pid, &child_status, 0);
277 
278 	if (!WIFEXITED(child_status))
279 		return got_error(GOT_ERR_PRIVSEP_DIED);
280 
281 	if (WEXITSTATUS(child_status) != 0)
282 		return got_error(GOT_ERR_PRIVSEP_EXIT);
283 
284 	return NULL;
285 }
286 
287 static const struct got_error *
288 read_object_header_privsep(struct got_object **obj, int fd)
289 {
290 	struct imsgbuf parent_ibuf;
291 	int imsg_fds[2];
292 	const struct got_error *err = NULL, *err_child = NULL;
293 	pid_t pid;
294 
295 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1)
296 		return got_error_from_errno();
297 
298 	pid = fork();
299 	if (pid == -1)
300 		return got_error_from_errno();
301 	else if (pid == 0) {
302 		read_object_header_privsep_child(fd, imsg_fds);
303 		/* not reached */
304 	}
305 
306 	close(imsg_fds[1]);
307 	imsg_init(&parent_ibuf, imsg_fds[0]);
308 	err = got_privsep_recv_obj(obj, &parent_ibuf);
309 	imsg_clear(&parent_ibuf);
310 	err_child = wait_for_child(pid);
311 	close(imsg_fds[0]);
312 	return err ? err : err_child;
313 }
314 
315 static const struct got_error *
316 object_path(char **path, struct got_object_id *id, struct got_repository *repo)
317 {
318 	const struct got_error *err = NULL;
319 	char *hex;
320 	char *path_objects = got_repo_get_path_objects(repo);
321 
322 	*path = NULL;
323 
324 	if (path_objects == NULL)
325 		return got_error_from_errno();
326 
327 	err = got_object_id_str(&hex, id);
328 	if (err)
329 		return err;
330 
331 	if (asprintf(path, "%s/%.2x/%s", path_objects,
332 	    id->sha1[0], hex + 2) == -1)
333 		err = got_error_from_errno();
334 
335 	free(hex);
336 	free(path_objects);
337 	return err;
338 }
339 
340 static const struct got_error *
341 open_loose_object(int *fd, struct got_object *obj, struct got_repository *repo)
342 {
343 	const struct got_error *err = NULL;
344 	char *path;
345 
346 	err = object_path(&path, &obj->id, repo);
347 	if (err)
348 		return err;
349 	*fd = open(path, O_RDONLY | O_NOFOLLOW, GOT_DEFAULT_FILE_MODE);
350 	if (*fd == -1) {
351 		err = got_error_from_errno();
352 		goto done;
353 	}
354 done:
355 	free(path);
356 	return err;
357 }
358 
359 const struct got_error *
360 got_object_open(struct got_object **obj, struct got_repository *repo,
361     struct got_object_id *id)
362 {
363 	const struct got_error *err = NULL;
364 	char *path;
365 	int fd;
366 
367 	err = object_path(&path, id, repo);
368 	if (err)
369 		return err;
370 
371 	fd = open(path, O_RDONLY | O_NOFOLLOW, GOT_DEFAULT_FILE_MODE);
372 	if (fd == -1) {
373 		if (errno != ENOENT) {
374 			err = got_error_from_errno();
375 			goto done;
376 		}
377 		err = got_packfile_open_object(obj, id, repo);
378 		if (err)
379 			goto done;
380 		if (*obj == NULL)
381 			err = got_error(GOT_ERR_NO_OBJ);
382 	} else {
383 		err = read_object_header_privsep(obj, fd);
384 		if (err)
385 			goto done;
386 		memcpy((*obj)->id.sha1, id->sha1, SHA1_DIGEST_LENGTH);
387 	}
388 done:
389 	free(path);
390 	if (fd != -1)
391 		close(fd);
392 	return err;
393 
394 }
395 
396 const struct got_error *
397 got_object_open_by_id_str(struct got_object **obj, struct got_repository *repo,
398     const char *id_str)
399 {
400 	struct got_object_id id;
401 
402 	if (!got_parse_sha1_digest(id.sha1, id_str))
403 		return got_error(GOT_ERR_BAD_OBJ_ID_STR);
404 
405 	return got_object_open(obj, repo, &id);
406 }
407 
408 void
409 got_object_close(struct got_object *obj)
410 {
411 	if (obj->flags & GOT_OBJ_FLAG_DELTIFIED) {
412 		struct got_delta *delta;
413 		while (!SIMPLEQ_EMPTY(&obj->deltas.entries)) {
414 			delta = SIMPLEQ_FIRST(&obj->deltas.entries);
415 			SIMPLEQ_REMOVE_HEAD(&obj->deltas.entries, entry);
416 			got_delta_close(delta);
417 		}
418 	}
419 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
420 		free(obj->path_packfile);
421 	free(obj);
422 }
423 
424 struct got_commit_object *
425 got_object_commit_alloc_partial(void)
426 {
427 	struct got_commit_object *commit;
428 
429 	commit = calloc(1, sizeof(*commit));
430 	if (commit == NULL)
431 		return NULL;
432 	commit->tree_id = calloc(1, sizeof(*commit->tree_id));
433 	if (commit->tree_id == NULL) {
434 		free(commit);
435 		return NULL;
436 	}
437 
438 	SIMPLEQ_INIT(&commit->parent_ids);
439 
440 	return commit;
441 }
442 
443 const struct got_error *
444 got_object_commit_add_parent(struct got_commit_object *commit,
445     const char *id_str)
446 {
447 	const struct got_error *err = NULL;
448 	struct got_parent_id *pid;
449 
450 	pid = calloc(1, sizeof(*pid));
451 	if (pid == NULL)
452 		return got_error_from_errno();
453 
454 	pid->id = calloc(1, sizeof(*pid->id));
455 	if (pid->id == NULL) {
456 		err = got_error_from_errno();
457 		free(pid);
458 		return err;
459 	}
460 
461 	if (!got_parse_sha1_digest(pid->id->sha1, id_str)) {
462 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
463 		free(pid->id);
464 		free(pid);
465 		return err;
466 	}
467 
468 	SIMPLEQ_INSERT_TAIL(&commit->parent_ids, pid, entry);
469 	commit->nparents++;
470 
471 	return NULL;
472 }
473 
474 static const struct got_error *
475 parse_commit_object(struct got_commit_object **commit, char *buf, size_t len)
476 {
477 	const struct got_error *err = NULL;
478 	char *s = buf;
479 	size_t tlen;
480 	ssize_t remain = (ssize_t)len;
481  
482 	*commit = got_object_commit_alloc_partial();
483 	if (*commit == NULL)
484 		return got_error_from_errno();
485 
486 	tlen = strlen(GOT_COMMIT_TAG_TREE);
487 	if (strncmp(s, GOT_COMMIT_TAG_TREE, tlen) == 0) {
488 		remain -= tlen;
489 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
490 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
491 			goto done;
492 		}
493 		s += tlen;
494 		if (!got_parse_sha1_digest((*commit)->tree_id->sha1, s)) {
495 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
496 			goto done;
497 		}
498 		remain -= SHA1_DIGEST_STRING_LENGTH;
499 		s += SHA1_DIGEST_STRING_LENGTH;
500 	} else {
501 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
502 		goto done;
503 	}
504 
505 	tlen = strlen(GOT_COMMIT_TAG_PARENT);
506 	while (strncmp(s, GOT_COMMIT_TAG_PARENT, tlen) == 0) {
507 		remain -= tlen;
508 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
509 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
510 			goto done;
511 		}
512 		s += tlen;
513 		err = got_object_commit_add_parent(*commit, s);
514 		if (err)
515 			goto done;
516 
517 		remain -= SHA1_DIGEST_STRING_LENGTH;
518 		s += SHA1_DIGEST_STRING_LENGTH;
519 	}
520 
521 	tlen = strlen(GOT_COMMIT_TAG_AUTHOR);
522 	if (strncmp(s, GOT_COMMIT_TAG_AUTHOR, tlen) == 0) {
523 		char *p;
524 
525 		remain -= tlen;
526 		if (remain <= 0) {
527 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
528 			goto done;
529 		}
530 		s += tlen;
531 		p = strchr(s, '\n');
532 		if (p == NULL) {
533 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
534 			goto done;
535 		}
536 		*p = '\0';
537 		(*commit)->author = strdup(s);
538 		if ((*commit)->author == NULL) {
539 			err = got_error_from_errno();
540 			goto done;
541 		}
542 		s += strlen((*commit)->author) + 1;
543 		remain -= strlen((*commit)->author) + 1;
544 	}
545 
546 	tlen = strlen(GOT_COMMIT_TAG_COMMITTER);
547 	if (strncmp(s, GOT_COMMIT_TAG_COMMITTER, tlen) == 0) {
548 		char *p;
549 
550 		remain -= tlen;
551 		if (remain <= 0) {
552 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
553 			goto done;
554 		}
555 		s += tlen;
556 		p = strchr(s, '\n');
557 		if (p == NULL) {
558 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
559 			goto done;
560 		}
561 		*p = '\0';
562 		(*commit)->committer = strdup(s);
563 		if ((*commit)->committer == NULL) {
564 			err = got_error_from_errno();
565 			goto done;
566 		}
567 		s += strlen((*commit)->committer) + 1;
568 		remain -= strlen((*commit)->committer) + 1;
569 	}
570 
571 	(*commit)->logmsg = strndup(s, remain);
572 	if ((*commit)->logmsg == NULL) {
573 		err = got_error_from_errno();
574 		goto done;
575 	}
576 done:
577 	if (err) {
578 		got_object_commit_close(*commit);
579 		*commit = NULL;
580 	}
581 	return err;
582 }
583 
584 static void
585 tree_entry_close(struct got_tree_entry *te)
586 {
587 	free(te->id);
588 	free(te->name);
589 	free(te);
590 }
591 
592 struct got_tree_entry *
593 got_alloc_tree_entry_partial(void)
594 {
595 	struct got_tree_entry *te;
596 
597 	te = calloc(1, sizeof(*te));
598 	if (te == NULL)
599 		return NULL;
600 
601 	te->id = calloc(1, sizeof(*te->id));
602 	if (te->id == NULL) {
603 		free(te);
604 		te = NULL;
605 	}
606 	return te;
607 }
608 
609 static const struct got_error *
610 parse_tree_entry(struct got_tree_entry **te, size_t *elen, char *buf,
611     size_t maxlen)
612 {
613 	char *p = buf, *space;
614 	const struct got_error *err = NULL;
615 
616 	*te = got_alloc_tree_entry_partial();
617 	if (*te == NULL)
618 		return got_error_from_errno();
619 
620 	*elen = strlen(buf) + 1;
621 	if (*elen > maxlen) {
622 		free(*te);
623 		*te = NULL;
624 		return got_error(GOT_ERR_BAD_OBJ_DATA);
625 	}
626 
627 	space = strchr(buf, ' ');
628 	if (space == NULL) {
629 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
630 		free(*te);
631 		*te = NULL;
632 		return err;
633 	}
634 	while (*p != ' ') {
635 		if (*p < '0' && *p > '7') {
636 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
637 			goto done;
638 		}
639 		(*te)->mode <<= 3;
640 		(*te)->mode |= *p - '0';
641 		p++;
642 	}
643 
644 	(*te)->name = strdup(space + 1);
645 	if (*elen > maxlen || maxlen - *elen < SHA1_DIGEST_LENGTH) {
646 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
647 		goto done;
648 	}
649 	buf += strlen(buf) + 1;
650 	memcpy((*te)->id->sha1, buf, SHA1_DIGEST_LENGTH);
651 	*elen += SHA1_DIGEST_LENGTH;
652 done:
653 	if (err) {
654 		tree_entry_close(*te);
655 		*te = NULL;
656 	}
657 	return err;
658 }
659 
660 static const struct got_error *
661 parse_tree_object(struct got_tree_object **tree, uint8_t *buf, size_t len)
662 {
663 	const struct got_error *err;
664 	size_t remain = len;
665 
666 	*tree = calloc(1, sizeof(**tree));
667 	if (*tree == NULL)
668 		return got_error_from_errno();
669 
670 	SIMPLEQ_INIT(&(*tree)->entries);
671 
672 	while (remain > 0) {
673 		struct got_tree_entry *te;
674 		size_t elen;
675 
676 		err = parse_tree_entry(&te, &elen, buf, remain);
677 		if (err)
678 			return err;
679 		(*tree)->nentries++;
680 		SIMPLEQ_INSERT_TAIL(&(*tree)->entries, te, entry);
681 		buf += elen;
682 		remain -= elen;
683 	}
684 
685 	if (remain != 0) {
686 		got_object_tree_close(*tree);
687 		return got_error(GOT_ERR_BAD_OBJ_DATA);
688 	}
689 
690 	return NULL;
691 }
692 
693 static const struct got_error *
694 read_to_mem(uint8_t **outbuf, size_t *outlen, FILE *f)
695 {
696 	const struct got_error *err = NULL;
697 	static const size_t blocksize = 512;
698 	size_t n, total, remain;
699 	uint8_t *buf;
700 
701 	*outbuf = NULL;
702 	*outlen = 0;
703 
704 	buf = calloc(1, blocksize);
705 	if (buf == NULL)
706 		return got_error_from_errno();
707 
708 	remain = blocksize;
709 	total = 0;
710 	while (1) {
711 		if (remain == 0) {
712 			uint8_t *newbuf;
713 			newbuf = reallocarray(buf, 1, total + blocksize);
714 			if (newbuf == NULL) {
715 				err = got_error_from_errno();
716 				goto done;
717 			}
718 			buf = newbuf;
719 			remain += blocksize;
720 		}
721 		n = fread(buf + total, 1, remain, f);
722 		if (n == 0) {
723 			if (ferror(f)) {
724 				err = got_ferror(f, GOT_ERR_IO);
725 				goto done;
726 			}
727 			break; /* EOF */
728 		}
729 		remain -= n;
730 		total += n;
731 	};
732 
733 done:
734 	if (err == NULL) {
735 		*outbuf = buf;
736 		*outlen = total;
737 	} else
738 		free(buf);
739 	return err;
740 }
741 
742 static const struct got_error *
743 read_commit_object(struct got_commit_object **commit, struct got_object *obj,
744     FILE *f)
745 {
746 	const struct got_error *err = NULL;
747 	size_t len;
748 	uint8_t *p;
749 
750 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
751 		err = read_to_mem(&p, &len, f);
752 	else
753 		err = got_inflate_to_mem(&p, &len, f);
754 	if (err)
755 		return err;
756 
757 	if (len < obj->hdrlen + obj->size) {
758 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
759 		goto done;
760 	}
761 
762 	/* Skip object header. */
763 	len -= obj->hdrlen;
764 	err = parse_commit_object(commit, p + obj->hdrlen, len);
765 	free(p);
766 done:
767 	return err;
768 }
769 
770 static void
771 read_commit_object_privsep_child(struct got_object *obj, int obj_fd,
772     int imsg_fds[2])
773 {
774 	const struct got_error *err = NULL;
775 	struct got_commit_object *commit = NULL;
776 	struct imsgbuf ibuf;
777 	FILE *f = NULL;
778 	int status = 0;
779 
780 	setproctitle("read commit object");
781 	close(imsg_fds[0]);
782 	imsg_init(&ibuf, imsg_fds[1]);
783 
784 	/* revoke access to most system calls */
785 	if (pledge("stdio", NULL) == -1) {
786 		err = got_error_from_errno();
787 		goto done;
788 	}
789 
790 	f = fdopen(obj_fd, "rb");
791 	if (f == NULL) {
792 		err = got_error_from_errno();
793 		close(obj_fd);
794 		goto done;
795 	}
796 
797 	err = read_commit_object(&commit, obj, f);
798 	if (err)
799 		goto done;
800 
801 	err = got_privsep_send_commit(&ibuf, commit);
802 done:
803 	if (commit)
804 		got_object_commit_close(commit);
805 	if (err) {
806 		got_privsep_send_error(&ibuf, err);
807 		status = 1;
808 	}
809 	if (f)
810 		fclose(f);
811 	imsg_clear(&ibuf);
812 	close(imsg_fds[1]);
813 	_exit(status);
814 }
815 
816 static const struct got_error *
817 read_commit_object_privsep(struct got_commit_object **commit,
818     struct got_repository *repo, struct got_object *obj, int fd)
819 {
820 	const struct got_error *err = NULL, *err_child = NULL;
821 	struct imsgbuf parent_ibuf;
822 	int imsg_fds[2];
823 	pid_t pid;
824 
825 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1)
826 		return got_error_from_errno();
827 
828 	pid = fork();
829 	if (pid == -1)
830 		return got_error_from_errno();
831 	else if (pid == 0) {
832 		read_commit_object_privsep_child(obj, fd, imsg_fds);
833 		/* not reached */
834 	}
835 
836 	close(imsg_fds[1]);
837 	imsg_init(&parent_ibuf, imsg_fds[0]);
838 	err = got_privsep_recv_commit(commit, &parent_ibuf);
839 	imsg_clear(&parent_ibuf);
840 	err_child = wait_for_child(pid);
841 	close(imsg_fds[0]);
842 	return err ? err : err_child;
843 }
844 
845 const struct got_error *
846 got_object_commit_open(struct got_commit_object **commit,
847     struct got_repository *repo, struct got_object *obj)
848 {
849 	const struct got_error *err = NULL;
850 
851 	if (obj->type != GOT_OBJ_TYPE_COMMIT)
852 		return got_error(GOT_ERR_OBJ_TYPE);
853 
854 	if (obj->flags & GOT_OBJ_FLAG_PACKED) {
855 		uint8_t *buf;
856 		size_t len;
857 		err = got_packfile_extract_object_to_mem(&buf, &len, obj, repo);
858 		if (err)
859 			return err;
860 		obj->size = len;
861 		err = parse_commit_object(commit, buf, len);
862 		free(buf);
863 	} else {
864 		int fd;
865 		err = open_loose_object(&fd, obj, repo);
866 		if (err)
867 			return err;
868 		err = read_commit_object_privsep(commit, repo, obj, fd);
869 		close(fd);
870 	}
871 	return err;
872 }
873 
874 void
875 got_object_commit_close(struct got_commit_object *commit)
876 {
877 	struct got_parent_id *pid;
878 
879 	while (!SIMPLEQ_EMPTY(&commit->parent_ids)) {
880 		pid = SIMPLEQ_FIRST(&commit->parent_ids);
881 		SIMPLEQ_REMOVE_HEAD(&commit->parent_ids, entry);
882 		free(pid->id);
883 		free(pid);
884 	}
885 
886 	free(commit->tree_id);
887 	free(commit->author);
888 	free(commit->committer);
889 	free(commit->logmsg);
890 	free(commit);
891 }
892 
893 static const struct got_error *
894 read_tree_object(struct got_tree_object **tree, struct got_object *obj, FILE *f)
895 {
896 	const struct got_error *err = NULL;
897 	size_t len;
898 	uint8_t *p;
899 
900 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
901 		err = read_to_mem(&p, &len, f);
902 	else
903 		err = got_inflate_to_mem(&p, &len, f);
904 	if (err)
905 		return err;
906 
907 	if (len < obj->hdrlen + obj->size) {
908 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
909 		goto done;
910 	}
911 
912 	/* Skip object header. */
913 	len -= obj->hdrlen;
914 	err = parse_tree_object(tree, p + obj->hdrlen, len);
915 	free(p);
916 done:
917 	return err;
918 }
919 
920 static void
921 read_tree_object_privsep_child(struct got_object *obj, int obj_fd,
922     int imsg_fds[2])
923 {
924 	const struct got_error *err = NULL;
925 	struct got_tree_object *tree = NULL;
926 	struct imsgbuf ibuf;
927 	FILE *f = NULL;
928 	int status = 0;
929 
930 	setproctitle("read tree object");
931 	close(imsg_fds[0]);
932 	imsg_init(&ibuf, imsg_fds[1]);
933 
934 	/* revoke access to most system calls */
935 	if (pledge("stdio", NULL) == -1) {
936 		err = got_error_from_errno();
937 		goto done;
938 	}
939 
940 	f = fdopen(obj_fd, "rb");
941 	if (f == NULL) {
942 		err = got_error_from_errno();
943 		close(obj_fd);
944 		goto done;
945 	}
946 
947 	err = read_tree_object(&tree, obj, f);
948 	if (err)
949 		goto done;
950 
951 	err = got_privsep_send_tree(&ibuf, tree);
952 done:
953 	if (tree)
954 		got_object_tree_close(tree);
955 	if (err) {
956 		got_privsep_send_error(&ibuf, err);
957 		status = 1;
958 	}
959 	if (f)
960 		fclose(f);
961 	imsg_clear(&ibuf);
962 	close(imsg_fds[1]);
963 	_exit(status);
964 }
965 
966 static const struct got_error *
967 read_tree_object_privsep(struct got_tree_object **tree, struct got_object *obj,
968     int fd)
969 {
970 	const struct got_error *err = NULL, *err_child = NULL;
971 	struct imsgbuf parent_ibuf;
972 	int imsg_fds[2];
973 	pid_t pid;
974 
975 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1)
976 		return got_error_from_errno();
977 
978 	pid = fork();
979 	if (pid == -1)
980 		return got_error_from_errno();
981 	else if (pid == 0) {
982 		read_tree_object_privsep_child(obj, fd, imsg_fds);
983 		/* not reached */
984 	}
985 
986 	close(imsg_fds[1]);
987 	imsg_init(&parent_ibuf, imsg_fds[0]);
988 	err = got_privsep_recv_tree(tree, &parent_ibuf);
989 	imsg_clear(&parent_ibuf);
990 	err_child = wait_for_child(pid);
991 	close(imsg_fds[0]);
992 	return err ? err : err_child;
993 }
994 
995 const struct got_error *
996 got_object_tree_open(struct got_tree_object **tree,
997     struct got_repository *repo, struct got_object *obj)
998 {
999 	const struct got_error *err = NULL;
1000 
1001 	if (obj->type != GOT_OBJ_TYPE_TREE)
1002 		return got_error(GOT_ERR_OBJ_TYPE);
1003 
1004 	if (obj->flags & GOT_OBJ_FLAG_PACKED) {
1005 		uint8_t *buf;
1006 		size_t len;
1007 		err = got_packfile_extract_object_to_mem(&buf, &len, obj, repo);
1008 		if (err)
1009 			return err;
1010 		obj->size = len;
1011 		err = parse_tree_object(tree, buf, len);
1012 		free(buf);
1013 	} else {
1014 		int fd;
1015 		err = open_loose_object(&fd, obj, repo);
1016 		if (err)
1017 			return err;
1018 		err = read_tree_object_privsep(tree, obj, fd);
1019 		close(fd);
1020 	}
1021 	return err;
1022 }
1023 
1024 void
1025 got_object_tree_close(struct got_tree_object *tree)
1026 {
1027 	struct got_tree_entry *te;
1028 
1029 	while (!SIMPLEQ_EMPTY(&tree->entries)) {
1030 		te = SIMPLEQ_FIRST(&tree->entries);
1031 		SIMPLEQ_REMOVE_HEAD(&tree->entries, entry);
1032 		tree_entry_close(te);
1033 	}
1034 
1035 	free(tree);
1036 }
1037 
1038 static const struct got_error *
1039 read_blob_object_privsep_child(int outfd, int infd, int imsg_fds[2])
1040 {
1041 	const struct got_error *err = NULL;
1042 	struct imsgbuf ibuf;
1043 	int status = 0;
1044 	size_t size;
1045 	FILE *infile = NULL;
1046 
1047 	setproctitle("read blob object");
1048 	close(imsg_fds[0]);
1049 	imsg_init(&ibuf, imsg_fds[1]);
1050 
1051 	/* revoke access to most system calls */
1052 	if (pledge("stdio", NULL) == -1) {
1053 		err = got_error_from_errno();
1054 		goto done;
1055 	}
1056 
1057 	infile = fdopen(infd, "rb");
1058 	if (infile == NULL) {
1059 		err = got_error_from_errno();
1060 		close(infd);
1061 		goto done;
1062 	}
1063 	err = got_inflate_to_fd(&size, infile, outfd);
1064 	fclose(infile);
1065 	if (err)
1066 		goto done;
1067 
1068 	err = got_privsep_send_blob(&ibuf, size);
1069 done:
1070 	if (err) {
1071 		got_privsep_send_error(&ibuf, err);
1072 		status = 1;
1073 	}
1074 	close(outfd);
1075 	imsg_clear(&ibuf);
1076 	close(imsg_fds[1]);
1077 	_exit(status);
1078 }
1079 
1080 static const struct got_error *
1081 read_blob_object_privsep(size_t *size, int outfd, int infd)
1082 {
1083 	struct imsgbuf parent_ibuf;
1084 	int imsg_fds[2];
1085 	const struct got_error *err = NULL, *err_child = NULL;
1086 	pid_t pid;
1087 
1088 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1)
1089 		return got_error_from_errno();
1090 
1091 	pid = fork();
1092 	if (pid == -1)
1093 		return got_error_from_errno();
1094 	else if (pid == 0) {
1095 		read_blob_object_privsep_child(outfd, infd, imsg_fds);
1096 		/* not reached */
1097 	}
1098 
1099 	close(imsg_fds[1]);
1100 	imsg_init(&parent_ibuf, imsg_fds[0]);
1101 	err = got_privsep_recv_blob(size, &parent_ibuf);
1102 	imsg_clear(&parent_ibuf);
1103 	err_child = wait_for_child(pid);
1104 	close(imsg_fds[0]);
1105 	if (lseek(outfd, SEEK_SET, 0) == -1)
1106 		err = got_error_from_errno();
1107 	return err ? err : err_child;
1108 }
1109 
1110 const struct got_error *
1111 got_object_blob_open(struct got_blob_object **blob,
1112     struct got_repository *repo, struct got_object *obj, size_t blocksize)
1113 {
1114 	const struct got_error *err = NULL;
1115 
1116 	if (obj->type != GOT_OBJ_TYPE_BLOB)
1117 		return got_error(GOT_ERR_OBJ_TYPE);
1118 
1119 	if (blocksize < obj->hdrlen)
1120 		return got_error(GOT_ERR_NO_SPACE);
1121 
1122 	*blob = calloc(1, sizeof(**blob));
1123 	if (*blob == NULL)
1124 		return got_error_from_errno();
1125 
1126 	(*blob)->read_buf = calloc(1, blocksize);
1127 	if ((*blob)->read_buf == NULL) {
1128 		err = got_error_from_errno();
1129 		goto done;
1130 	}
1131 	if (obj->flags & GOT_OBJ_FLAG_PACKED) {
1132 		err = got_packfile_extract_object(&((*blob)->f), obj, repo);
1133 		if (err)
1134 			goto done;
1135 	} else {
1136 		int infd, outfd;
1137 		size_t size;
1138 		struct stat sb;
1139 
1140 		err = open_loose_object(&infd, obj, repo);
1141 		if (err)
1142 			goto done;
1143 
1144 
1145 		outfd = got_opentempfd();
1146 		if (outfd == -1) {
1147 			err = got_error_from_errno();
1148 			close(infd);
1149 			goto done;
1150 		}
1151 
1152 		err = read_blob_object_privsep(&size, outfd, infd);
1153 		close(infd);
1154 		if (err)
1155 			goto done;
1156 
1157 		if (size != obj->hdrlen + obj->size) {
1158 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1159 			close(outfd);
1160 			goto done;
1161 		}
1162 
1163 		if (fstat(outfd, &sb) == -1) {
1164 			err = got_error_from_errno();
1165 			close(outfd);
1166 			goto done;
1167 		}
1168 
1169 		if (sb.st_size != size) {
1170 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1171 			close(outfd);
1172 			goto done;
1173 		}
1174 
1175 		(*blob)->f = fdopen(outfd, "rb");
1176 		if ((*blob)->f == NULL) {
1177 			err = got_error_from_errno();
1178 			close(outfd);
1179 			goto done;
1180 		}
1181 	}
1182 
1183 	(*blob)->hdrlen = obj->hdrlen;
1184 	(*blob)->blocksize = blocksize;
1185 	memcpy(&(*blob)->id.sha1, obj->id.sha1, SHA1_DIGEST_LENGTH);
1186 
1187 done:
1188 	if (err && *blob) {
1189 		if ((*blob)->f)
1190 			fclose((*blob)->f);
1191 		free((*blob)->read_buf);
1192 		free(*blob);
1193 		*blob = NULL;
1194 	}
1195 	return err;
1196 }
1197 
1198 void
1199 got_object_blob_close(struct got_blob_object *blob)
1200 {
1201 	free(blob->read_buf);
1202 	fclose(blob->f);
1203 	free(blob);
1204 }
1205 
1206 char *
1207 got_object_blob_id_str(struct got_blob_object *blob, char *buf, size_t size)
1208 {
1209 	return got_sha1_digest_to_str(blob->id.sha1, buf, size);
1210 }
1211 
1212 size_t
1213 got_object_blob_get_hdrlen(struct got_blob_object *blob)
1214 {
1215 	return blob->hdrlen;
1216 }
1217 
1218 const uint8_t *
1219 got_object_blob_get_read_buf(struct got_blob_object *blob)
1220 {
1221 	return blob->read_buf;
1222 }
1223 
1224 const struct got_error *
1225 got_object_blob_read_block(size_t *outlenp, struct got_blob_object *blob)
1226 {
1227 	size_t n;
1228 
1229 	n = fread(blob->read_buf, 1, blob->blocksize, blob->f);
1230 	if (n == 0 && ferror(blob->f))
1231 		return got_ferror(blob->f, GOT_ERR_IO);
1232 	*outlenp = n;
1233 	return NULL;
1234 }