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Date:: Wed Sep 12 22:06:12 2018 UTC
Message:: fix "rpath" pledge violation in got-read-pack
Actions:: History | Blame | Raw File
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/queue.h>
19 #include <sys/uio.h>
20 #include <sys/syslimits.h>
21 #include <sys/wait.h>
22 
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
26 #include <errno.h>
27 #include <stdint.h>
28 #include <poll.h>
29 #include <imsg.h>
30 #include <sha1.h>
31 #include <zlib.h>
32 #include <time.h>
33 
34 #include "got_object.h"
35 #include "got_error.h"
36 
37 #include "got_lib_sha1.h"
38 #include "got_lib_delta.h"
39 #include "got_lib_inflate.h"
40 #include "got_lib_object.h"
41 #include "got_lib_object_parse.h"
42 #include "got_lib_privsep.h"
43 #include "got_lib_pack.h"
44 
45 #ifndef MIN
46 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
47 #endif
48 
49 static const struct got_error *
50 poll_fd(int fd, int events, int timeout)
51 {
52 	struct pollfd pfd[1];
53 	int n;
54 
55 	pfd[0].fd = fd;
56 	pfd[0].events = events;
57 
58 	n = poll(pfd, 1, timeout);
59 	if (n == -1)
60 		return got_error_from_errno();
61 	if (n == 0)
62 		return got_error(GOT_ERR_TIMEOUT);
63 	if (pfd[0].revents & (POLLERR | POLLNVAL))
64 		return got_error_from_errno();
65 	if (pfd[0].revents & (events | POLLHUP))
66 		return NULL;
67 
68 	return got_error(GOT_ERR_INTERRUPT);
69 }
70 
71 static const struct got_error *
72 read_imsg(struct imsgbuf *ibuf)
73 {
74 	const struct got_error *err;
75 	size_t n;
76 
77 	err = poll_fd(ibuf->fd, POLLIN, INFTIM);
78 	if (err)
79 		return err;
80 
81 	n = imsg_read(ibuf);
82 	if (n == -1) {
83 		if (errno == EAGAIN) /* Could be a file-descriptor leak. */
84 			return got_error(GOT_ERR_PRIVSEP_NO_FD);
85 		return got_error(GOT_ERR_PRIVSEP_READ);
86 	}
87 	if (n == 0)
88 		return got_error(GOT_ERR_PRIVSEP_PIPE);
89 
90 	return NULL;
91 }
92 
93 const struct got_error *
94 got_privsep_wait_for_child(pid_t pid)
95 {
96 	int child_status;
97 
98 	waitpid(pid, &child_status, 0);
99 
100 	if (!WIFEXITED(child_status))
101 		return got_error(GOT_ERR_PRIVSEP_DIED);
102 
103 	if (WEXITSTATUS(child_status) != 0)
104 		return got_error(GOT_ERR_PRIVSEP_EXIT);
105 
106 	return NULL;
107 }
108 
109 const struct got_error *
110 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf, size_t min_datalen)
111 {
112 	const struct got_error *err;
113 	ssize_t n;
114 
115 	n = imsg_get(ibuf, imsg);
116 	if (n == -1)
117 		return got_error_from_errno();
118 
119 	while (n == 0) {
120 		err = read_imsg(ibuf);
121 		if (err)
122 			return err;
123 		n = imsg_get(ibuf, imsg);
124 	}
125 
126 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
127 		return got_error(GOT_ERR_PRIVSEP_LEN);
128 
129 	return NULL;
130 }
131 
132 static const struct got_error *
133 recv_imsg_error(struct imsg *imsg, size_t datalen)
134 {
135 	struct got_imsg_error ierr;
136 
137 	if (datalen != sizeof(ierr))
138 		return got_error(GOT_ERR_PRIVSEP_LEN);
139 
140 	memcpy(&ierr, imsg->data, sizeof(ierr));
141 	if (ierr.code == GOT_ERR_ERRNO) {
142 		static struct got_error serr;
143 		serr.code = GOT_ERR_ERRNO;
144 		serr.msg = strerror(ierr.errno_code);
145 		return &serr;
146 	}
147 
148 	return got_error(ierr.code);
149 }
150 
151 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
152 void
153 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
154 {
155 	const struct got_error *poll_err;
156 	struct got_imsg_error ierr;
157 	int ret;
158 
159 	ierr.code = err->code;
160 	if (err->code == GOT_ERR_ERRNO)
161 		ierr.errno_code = errno;
162 	else
163 		ierr.errno_code = 0;
164 	ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
165 	if (ret != -1) {
166 		fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
167 		    getprogname(), err->code, err->msg, strerror(errno));
168 		return;
169 	}
170 
171 	poll_err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
172 	if (poll_err) {
173 		fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
174 		    getprogname(), err->code, err->msg, poll_err->msg);
175 		return;
176 	}
177 
178 	ret = imsg_flush(ibuf);
179 	if (ret == -1) {
180 		fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
181 		    getprogname(), err->code, err->msg, strerror(errno));
182 		return;
183 	}
184 }
185 
186 static const struct got_error *
187 flush_imsg(struct imsgbuf *ibuf)
188 {
189 	const struct got_error *err;
190 
191 	err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
192 	if (err)
193 		return err;
194 
195 	if (imsg_flush(ibuf) == -1)
196 		return got_error_from_errno();
197 
198 	return NULL;
199 }
200 
201 const struct got_error *
202 got_privsep_send_stop(int fd)
203 {
204 	const struct got_error *err = NULL;
205 	struct imsgbuf ibuf;
206 
207 	imsg_init(&ibuf, fd);
208 
209 	if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
210 		return got_error_from_errno();
211 
212 	err = flush_imsg(&ibuf);
213 	imsg_clear(&ibuf);
214 	return err;
215 }
216 
217 const struct got_error *
218 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd, struct got_object *obj)
219 {
220 	struct got_imsg_object iobj, *iobjp = NULL;
221 	size_t iobj_size = 0;
222 	int imsg_code = GOT_IMSG_OBJECT_REQUEST;
223 
224 	if (obj) {
225 		switch (obj->type) {
226 		case GOT_OBJ_TYPE_TREE:
227 			imsg_code = GOT_IMSG_TREE_REQUEST;
228 			break;
229 		case GOT_OBJ_TYPE_COMMIT:
230 			imsg_code = GOT_IMSG_COMMIT_REQUEST;
231 			break;
232 		case GOT_OBJ_TYPE_BLOB:
233 			imsg_code = GOT_IMSG_BLOB_REQUEST;
234 			break;
235 		default:
236 			return got_error(GOT_ERR_OBJ_TYPE);
237 		}
238 
239 		memcpy(iobj.id, obj->id.sha1, sizeof(iobj.id));
240 		iobj.type = obj->type;
241 		iobj.flags = obj->flags;
242 		iobj.hdrlen = obj->hdrlen;
243 		iobj.size = obj->size;
244 		if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
245 			iobj.pack_offset = obj->pack_offset;
246 			iobj.pack_idx = obj->pack_idx;
247 		}
248 
249 		iobjp = &iobj;
250 		iobj_size = sizeof(iobj);
251 	}
252 
253 	if (imsg_compose(ibuf, imsg_code, 0, 0, fd, iobjp, iobj_size) == -1)
254 		return got_error_from_errno();
255 
256 	return flush_imsg(ibuf);
257 }
258 
259 const struct got_error *
260 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd)
261 {
262 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, NULL, 0)
263 	    == -1)
264 		return got_error_from_errno();
265 
266 	return flush_imsg(ibuf);
267 }
268 
269 const struct got_error *
270 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
271 {
272 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
273 	    == -1)
274 		return got_error_from_errno();
275 
276 	return flush_imsg(ibuf);
277 }
278 
279 const struct got_error *
280 got_privsep_send_tmpfd(struct imsgbuf *ibuf, int fd)
281 {
282 	if (imsg_compose(ibuf, GOT_IMSG_TMPFD, 0, 0, fd, NULL, 0)
283 	    == -1)
284 		return got_error_from_errno();
285 
286 	return flush_imsg(ibuf);
287 }
288 
289 const struct got_error *
290 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
291 {
292 	struct got_imsg_object iobj;
293 
294 	memcpy(iobj.id, obj->id.sha1, sizeof(iobj.id));
295 	iobj.type = obj->type;
296 	iobj.flags = obj->flags;
297 	iobj.hdrlen = obj->hdrlen;
298 	iobj.size = obj->size;
299 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
300 		iobj.pack_offset = obj->pack_offset;
301 		iobj.pack_idx = obj->pack_idx;
302 	}
303 
304 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
305 	    == -1)
306 		return got_error_from_errno();
307 
308 	return flush_imsg(ibuf);
309 }
310 
311 const struct got_error *
312 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
313     struct imsgbuf *ibuf)
314 {
315 	const struct got_error *err = NULL;
316 	struct got_imsg_object iobj;
317 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
318 
319 	if (datalen != sizeof(iobj))
320 		return got_error(GOT_ERR_PRIVSEP_LEN);
321 
322 	memcpy(&iobj, imsg->data, sizeof(iobj));
323 
324 	*obj = calloc(1, sizeof(**obj));
325 	if (*obj == NULL)
326 		return got_error_from_errno();
327 
328 	memcpy((*obj)->id.sha1, iobj.id, SHA1_DIGEST_LENGTH);
329 	(*obj)->type = iobj.type;
330 	(*obj)->flags = iobj.flags;
331 	(*obj)->hdrlen = iobj.hdrlen;
332 	(*obj)->size = iobj.size;
333 	/* path_packfile is handled by caller */
334 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
335 		(*obj)->pack_offset = iobj.pack_offset;
336 		(*obj)->pack_idx = iobj.pack_idx;
337 	}
338 
339 	return err;
340 }
341 
342 const struct got_error *
343 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
344 {
345 	const struct got_error *err = NULL;
346 	struct imsg imsg;
347 	size_t datalen;
348 	const size_t min_datalen =
349 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
350 
351 	*obj = NULL;
352 
353 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
354 	if (err)
355 		return err;
356 
357 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
358 
359 	switch (imsg.hdr.type) {
360 	case GOT_IMSG_ERROR:
361 		err = recv_imsg_error(&imsg, datalen);
362 		break;
363 	case GOT_IMSG_OBJECT:
364 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
365 		break;
366 	default:
367 		err = got_error(GOT_ERR_PRIVSEP_MSG);
368 		break;
369 	}
370 
371 	imsg_free(&imsg);
372 
373 	return err;
374 }
375 
376 static const struct got_error *
377 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
378     size_t logmsg_len)
379 {
380 	size_t offset, remain;
381 
382 	offset = 0;
383 	remain = logmsg_len;
384 	while (remain > 0) {
385 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
386 
387 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
388 		    commit->logmsg + offset, n) == -1)
389 			return got_error_from_errno();
390 
391 		if (imsg_flush(ibuf) == -1)
392 			return got_error_from_errno();
393 
394 		offset += n;
395 		remain -= n;
396 	}
397 
398 	return NULL;
399 }
400 
401 const struct got_error *
402 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
403 {
404 	const struct got_error *err = NULL;
405 	struct got_imsg_commit_object icommit;
406 	uint8_t *buf;
407 	size_t len, total;
408 	struct got_object_qid *qid;
409 	size_t logmsg_len = strlen(commit->logmsg);
410 
411 	memcpy(icommit.tree_id, commit->tree_id->sha1, sizeof(icommit.tree_id));
412 	icommit.author_len = strlen(commit->author);
413 	memcpy(&icommit.tm_author, &commit->tm_author,
414 	    sizeof(icommit.tm_author));
415 	icommit.committer_len = strlen(commit->committer);
416 	memcpy(&icommit.tm_committer, &commit->tm_committer,
417 	    sizeof(icommit.tm_committer));
418 	icommit.logmsg_len = logmsg_len;
419 	icommit.nparents = commit->nparents;
420 
421 	total = sizeof(icommit) + icommit.author_len +
422 	    icommit.committer_len + icommit.nparents * SHA1_DIGEST_LENGTH;
423 
424 	buf = malloc(total);
425 	if (buf == NULL)
426 		return got_error_from_errno();
427 
428 	len = 0;
429 	memcpy(buf + len, &icommit, sizeof(icommit));
430 	len += sizeof(icommit);
431 	memcpy(buf + len, commit->author, icommit.author_len);
432 	len += icommit.author_len;
433 	memcpy(buf + len, commit->committer, icommit.committer_len);
434 	len += icommit.committer_len;
435 	SIMPLEQ_FOREACH(qid, &commit->parent_ids, entry) {
436 		memcpy(buf + len, qid->id, SHA1_DIGEST_LENGTH);
437 		len += SHA1_DIGEST_LENGTH;
438 	}
439 
440 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
441 		err = got_error_from_errno();
442 		goto done;
443 	}
444 
445 	err = flush_imsg(ibuf);
446 	if (err)
447 		goto done;
448 
449 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
450 done:
451 	free(buf);
452 	return err;
453 }
454 
455 const struct got_error *
456 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
457 {
458 	const struct got_error *err = NULL;
459 	struct imsg imsg;
460 	struct got_imsg_commit_object icommit;
461 	size_t len, datalen;
462 	int i;
463 	const size_t min_datalen =
464 	    MIN(sizeof(struct got_imsg_error),
465 	    sizeof(struct got_imsg_commit_object));
466 	uint8_t *data;
467 
468 	*commit = NULL;
469 
470 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
471 	if (err)
472 		return err;
473 
474 	data = imsg.data;
475 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
476 	len = 0;
477 
478 	switch (imsg.hdr.type) {
479 	case GOT_IMSG_ERROR:
480 		err = recv_imsg_error(&imsg, datalen);
481 		break;
482 	case GOT_IMSG_COMMIT:
483 		if (datalen < sizeof(icommit)) {
484 			err = got_error(GOT_ERR_PRIVSEP_LEN);
485 			break;
486 		}
487 
488 		memcpy(&icommit, data, sizeof(icommit));
489 		if (datalen != sizeof(icommit) + icommit.author_len +
490 		    icommit.committer_len +
491 		    icommit.nparents * SHA1_DIGEST_LENGTH) {
492 			err = got_error(GOT_ERR_PRIVSEP_LEN);
493 			break;
494 		}
495 		if (icommit.nparents < 0) {
496 			err = got_error(GOT_ERR_PRIVSEP_LEN);
497 			break;
498 		}
499 		len += sizeof(icommit);
500 
501 		*commit = got_object_commit_alloc_partial();
502 		if (*commit == NULL) {
503 			err = got_error_from_errno();
504 			break;
505 		}
506 
507 		memcpy((*commit)->tree_id->sha1, icommit.tree_id,
508 		    SHA1_DIGEST_LENGTH);
509 		memcpy(&(*commit)->tm_author, &icommit.tm_author,
510 		    sizeof((*commit)->tm_author));
511 		memcpy(&(*commit)->tm_committer, &icommit.tm_committer,
512 		    sizeof((*commit)->tm_committer));
513 
514 		if (icommit.author_len == 0) {
515 			(*commit)->author = strdup("");
516 			if ((*commit)->author == NULL) {
517 				err = got_error_from_errno();
518 				break;
519 			}
520 		} else {
521 			(*commit)->author = malloc(icommit.author_len + 1);
522 			if ((*commit)->author == NULL) {
523 				err = got_error_from_errno();
524 				break;
525 			}
526 			memcpy((*commit)->author, data + len,
527 			    icommit.author_len);
528 			(*commit)->author[icommit.author_len] = '\0';
529 		}
530 		len += icommit.author_len;
531 
532 		if (icommit.committer_len == 0) {
533 			(*commit)->committer = strdup("");
534 			if ((*commit)->committer == NULL) {
535 				err = got_error_from_errno();
536 				break;
537 			}
538 		} else {
539 			(*commit)->committer =
540 			    malloc(icommit.committer_len + 1);
541 			if ((*commit)->committer == NULL) {
542 				err = got_error_from_errno();
543 				break;
544 			}
545 			memcpy((*commit)->committer, data + len,
546 			    icommit.committer_len);
547 			(*commit)->committer[icommit.committer_len] = '\0';
548 		}
549 		len += icommit.committer_len;
550 
551 		if (icommit.logmsg_len == 0) {
552 			(*commit)->logmsg = strdup("");
553 			if ((*commit)->logmsg == NULL) {
554 				err = got_error_from_errno();
555 				break;
556 			}
557 		} else {
558 			size_t offset = 0, remain = icommit.logmsg_len;
559 
560 			(*commit)->logmsg = malloc(icommit.logmsg_len + 1);
561 			if ((*commit)->logmsg == NULL) {
562 				err = got_error_from_errno();
563 				break;
564 			}
565 			while (remain > 0) {
566 				struct imsg imsg_log;
567 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
568 				    remain);
569 
570 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
571 				if (err)
572 					return err;
573 
574 				if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG)
575 					return got_error(GOT_ERR_PRIVSEP_MSG);
576 
577 				memcpy((*commit)->logmsg + offset,
578 				    imsg_log.data, n);
579 				imsg_free(&imsg_log);
580 				offset += n;
581 				remain -= n;
582 			}
583 			(*commit)->logmsg[icommit.logmsg_len] = '\0';
584 		}
585 
586 		for (i = 0; i < icommit.nparents; i++) {
587 			struct got_object_qid *qid;
588 
589 			qid = calloc(1, sizeof(*qid));
590 			if (qid == NULL) {
591 				err = got_error_from_errno();
592 				break;
593 			}
594 			qid->id = calloc(1, sizeof(*qid->id));
595 			if (qid->id == NULL) {
596 				err = got_error_from_errno();
597 				free(qid);
598 				break;
599 			}
600 
601 			memcpy(qid->id, data + len + i * SHA1_DIGEST_LENGTH,
602 			    sizeof(*qid->id));
603 			SIMPLEQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
604 			(*commit)->nparents++;
605 		}
606 		break;
607 	default:
608 		err = got_error(GOT_ERR_PRIVSEP_MSG);
609 		break;
610 	}
611 
612 	imsg_free(&imsg);
613 
614 	return err;
615 }
616 
617 const struct got_error *
618 got_privsep_send_tree(struct imsgbuf *ibuf, struct got_tree_object *tree)
619 {
620 	const struct got_error *err = NULL;
621 	struct got_imsg_tree_object itree;
622 	struct got_tree_entry *te;
623 
624 	itree.nentries = tree->entries.nentries;
625 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
626 	    == -1)
627 		return got_error_from_errno();
628 
629 	err = flush_imsg(ibuf);
630 	if (err)
631 		return err;
632 
633 	SIMPLEQ_FOREACH(te, &tree->entries.head, entry) {
634 		struct got_imsg_tree_entry ite;
635 		uint8_t *buf = NULL;
636 		size_t len = sizeof(ite) + strlen(te->name);
637 
638 		if (len > MAX_IMSGSIZE)
639 			return got_error(GOT_ERR_NO_SPACE);
640 
641 		buf = malloc(len);
642 		if (buf == NULL)
643 			return got_error_from_errno();
644 
645 		memcpy(ite.id, te->id->sha1, sizeof(ite.id));
646 		ite.mode = te->mode;
647 		memcpy(buf, &ite, sizeof(ite));
648 		memcpy(buf + sizeof(ite), te->name, strlen(te->name));
649 
650 		if (imsg_compose(ibuf, GOT_IMSG_TREE_ENTRY, 0, 0, -1,
651 		    buf, len) == -1)
652 			err = got_error_from_errno();
653 		free(buf);
654 		if (err)
655 			return err;
656 
657 		err = flush_imsg(ibuf);
658 		if (err)
659 			return err;
660 	}
661 
662 	return NULL;
663 }
664 
665 const struct got_error *
666 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
667 {
668 	const struct got_error *err = NULL;
669 	const size_t min_datalen =
670 	    MIN(sizeof(struct got_imsg_error),
671 	    sizeof(struct got_imsg_tree_object));
672 	struct got_imsg_tree_object itree = { 0 };
673 	int nentries = 0;
674 
675 	*tree = NULL;
676 get_more:
677 	err = read_imsg(ibuf);
678 	if (err)
679 		goto done;
680 
681 	while (1) {
682 		struct imsg imsg;
683 		size_t n;
684 		size_t datalen;
685 		struct got_imsg_tree_entry ite;
686 		struct got_tree_entry *te = NULL;
687 
688 		n = imsg_get(ibuf, &imsg);
689 		if (n == 0) {
690 			if (*tree && (*tree)->entries.nentries != nentries)
691 				goto get_more;
692 			break;
693 		}
694 
695 		if (imsg.hdr.len < IMSG_HEADER_SIZE + min_datalen)
696 			return got_error(GOT_ERR_PRIVSEP_LEN);
697 
698 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
699 
700 		switch (imsg.hdr.type) {
701 		case GOT_IMSG_ERROR:
702 			err = recv_imsg_error(&imsg, datalen);
703 			break;
704 		case GOT_IMSG_TREE:
705 			/* This message should only appear once. */
706 			if (*tree != NULL) {
707 				err = got_error(GOT_ERR_PRIVSEP_MSG);
708 				break;
709 			}
710 			if (datalen != sizeof(itree)) {
711 				err = got_error(GOT_ERR_PRIVSEP_LEN);
712 				break;
713 			}
714 			memcpy(&itree, imsg.data, sizeof(itree));
715 			*tree = calloc(1, sizeof(**tree));
716 			if (*tree == NULL) {
717 				err = got_error_from_errno();
718 				break;
719 			}
720 			(*tree)->entries.nentries = itree.nentries;
721 			SIMPLEQ_INIT(&(*tree)->entries.head);
722 			break;
723 		case GOT_IMSG_TREE_ENTRY:
724 			/* This message should be preceeded by GOT_IMSG_TREE. */
725 			if (*tree == NULL) {
726 				err = got_error(GOT_ERR_PRIVSEP_MSG);
727 				break;
728 			}
729 			if (datalen < sizeof(ite) || datalen > MAX_IMSGSIZE) {
730 				err = got_error(GOT_ERR_PRIVSEP_LEN);
731 				break;
732 			}
733 
734 			/* Remaining data contains the entry's name. */
735 			datalen -= sizeof(ite);
736 			memcpy(&ite, imsg.data, sizeof(ite));
737 			if (datalen == 0 || datalen > MAX_IMSGSIZE) {
738 				err = got_error(GOT_ERR_PRIVSEP_LEN);
739 				break;
740 			}
741 
742 			te = got_alloc_tree_entry_partial();
743 			if (te == NULL) {
744 				err = got_error_from_errno();
745 				break;
746 			}
747 			te->name = malloc(datalen + 1);
748 			if (te->name == NULL) {
749 				free(te);
750 				err = got_error_from_errno();
751 				break;
752 			}
753 			memcpy(te->name, imsg.data + sizeof(ite), datalen);
754 			te->name[datalen] = '\0';
755 
756 			memcpy(te->id->sha1, ite.id, SHA1_DIGEST_LENGTH);
757 			te->mode = ite.mode;
758 			SIMPLEQ_INSERT_TAIL(&(*tree)->entries.head, te, entry);
759 			nentries++;
760 			break;
761 		default:
762 			err = got_error(GOT_ERR_PRIVSEP_MSG);
763 			break;
764 		}
765 
766 		imsg_free(&imsg);
767 	}
768 done:
769 	if (*tree && (*tree)->entries.nentries != nentries) {
770 		if (err == NULL)
771 			err = got_error(GOT_ERR_PRIVSEP_LEN);
772 		got_object_tree_close(*tree);
773 		*tree = NULL;
774 	}
775 
776 	return err;
777 }
778 
779 const struct got_error *
780 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size)
781 {
782 	struct got_imsg_blob iblob;
783 
784 	iblob.size = size;
785 	/* Data has already been written to file descriptor. */
786 
787 	if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob, sizeof(iblob))
788 	    == -1)
789 		return got_error_from_errno();
790 
791 	return flush_imsg(ibuf);
792 }
793 
794 const struct got_error *
795 got_privsep_recv_blob(size_t *size, struct imsgbuf *ibuf)
796 {
797 	const struct got_error *err = NULL;
798 	struct imsg imsg;
799 	struct got_imsg_blob iblob;
800 	size_t datalen;
801 
802 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
803 	if (err)
804 		return err;
805 
806 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
807 
808 	switch (imsg.hdr.type) {
809 	case GOT_IMSG_ERROR:
810 		err = recv_imsg_error(&imsg, datalen);
811 		break;
812 	case GOT_IMSG_BLOB:
813 		if (datalen != sizeof(iblob))
814 			err = got_error(GOT_ERR_PRIVSEP_LEN);
815 		memcpy(&iblob, imsg.data, sizeof(iblob));
816 		*size = iblob.size;
817 		/* Data has been written to file descriptor. */
818 		break;
819 	default:
820 		err = got_error(GOT_ERR_PRIVSEP_MSG);
821 		break;
822 	}
823 
824 	imsg_free(&imsg);
825 
826 	return err;
827 }
828 
829 const struct got_error *
830 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
831     struct got_packidx *packidx)
832 {
833 	struct got_imsg_packidx ipackidx;
834 	struct got_imsg_pack ipack;
835 	int fd;
836 
837 	ipackidx.len = packidx->len;
838 	fd = dup(packidx->fd);
839 	if (fd == -1)
840 		return got_error_from_errno();
841 
842 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
843 	    sizeof(ipackidx)) == -1)
844 		return got_error_from_errno();
845 
846 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
847 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
848 		return got_error(GOT_ERR_NO_SPACE);
849 	ipack.filesize = pack->filesize;
850 
851 	fd = dup(pack->fd);
852 	if (fd == -1)
853 		return got_error_from_errno();
854 
855 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
856 	    == -1)
857 		return got_error_from_errno();
858 
859 	return flush_imsg(ibuf);
860 }
861 
862 const struct got_error *
863 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx)
864 {
865 	struct got_imsg_packed_object iobj;
866 
867 	iobj.idx = idx;
868 
869 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
870 	    &iobj, sizeof(iobj)) == -1)
871 		return got_error_from_errno();
872 
873 	return flush_imsg(ibuf);
874 }