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Date:: Mon Jan 6 19:38:23 2020 UTC
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1 /*
2  * Copyright (c) 2018, 2019, 2020 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 #include "got_path.h"
37 #include "got_repository.h"
38 
39 #include "got_lib_sha1.h"
40 #include "got_lib_delta.h"
41 #include "got_lib_inflate.h"
42 #include "got_lib_object.h"
43 #include "got_lib_object_parse.h"
44 #include "got_lib_privsep.h"
45 #include "got_lib_pack.h"
46 
47 #ifndef MIN
48 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
49 #endif
50 
51 #ifndef nitems
52 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
53 #endif
54 
55 static const struct got_error *
56 poll_fd(int fd, int events, int timeout)
57 {
58 	struct pollfd pfd[1];
59 	int n;
60 
61 	pfd[0].fd = fd;
62 	pfd[0].events = events;
63 
64 	n = poll(pfd, 1, timeout);
65 	if (n == -1)
66 		return got_error_from_errno("poll");
67 	if (n == 0)
68 		return got_error(GOT_ERR_TIMEOUT);
69 	if (pfd[0].revents & (POLLERR | POLLNVAL))
70 		return got_error_from_errno("poll error");
71 	if (pfd[0].revents & (events | POLLHUP))
72 		return NULL;
73 
74 	return got_error(GOT_ERR_INTERRUPT);
75 }
76 
77 static const struct got_error *
78 read_imsg(struct imsgbuf *ibuf)
79 {
80 	const struct got_error *err;
81 	size_t n;
82 
83 	err = poll_fd(ibuf->fd, POLLIN, INFTIM);
84 	if (err)
85 		return err;
86 
87 	n = imsg_read(ibuf);
88 	if (n == -1) {
89 		if (errno == EAGAIN) /* Could be a file-descriptor leak. */
90 			return got_error(GOT_ERR_PRIVSEP_NO_FD);
91 		return got_error(GOT_ERR_PRIVSEP_READ);
92 	}
93 	if (n == 0)
94 		return got_error(GOT_ERR_PRIVSEP_PIPE);
95 
96 	return NULL;
97 }
98 
99 const struct got_error *
100 got_privsep_wait_for_child(pid_t pid)
101 {
102 	int child_status;
103 
104 	if (waitpid(pid, &child_status, 0) == -1)
105 		return got_error_from_errno("waitpid");
106 
107 	if (!WIFEXITED(child_status))
108 		return got_error(GOT_ERR_PRIVSEP_DIED);
109 
110 	if (WEXITSTATUS(child_status) != 0)
111 		return got_error(GOT_ERR_PRIVSEP_EXIT);
112 
113 	return NULL;
114 }
115 
116 static const struct got_error *
117 recv_imsg_error(struct imsg *imsg, size_t datalen)
118 {
119 	struct got_imsg_error *ierr;
120 
121 	if (datalen != sizeof(*ierr))
122 		return got_error(GOT_ERR_PRIVSEP_LEN);
123 
124 	ierr = imsg->data;
125 	if (ierr->code == GOT_ERR_ERRNO) {
126 		static struct got_error serr;
127 		serr.code = GOT_ERR_ERRNO;
128 		serr.msg = strerror(ierr->errno_code);
129 		return &serr;
130 	}
131 
132 	return got_error(ierr->code);
133 }
134 
135 const struct got_error *
136 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf,
137     size_t min_datalen)
138 {
139 	const struct got_error *err;
140 	ssize_t n;
141 
142 	n = imsg_get(ibuf, imsg);
143 	if (n == -1)
144 		return got_error_from_errno("imsg_get");
145 
146 	while (n == 0) {
147 		err = read_imsg(ibuf);
148 		if (err)
149 			return err;
150 		n = imsg_get(ibuf, imsg);
151 		if (n == -1)
152 			return got_error_from_errno("imsg_get");
153 	}
154 
155 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
156 		return got_error(GOT_ERR_PRIVSEP_LEN);
157 
158 	if (imsg->hdr.type == GOT_IMSG_ERROR) {
159 		size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
160 		return recv_imsg_error(imsg, datalen);
161 	}
162 
163 	return NULL;
164 }
165 
166 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
167 void
168 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
169 {
170 	const struct got_error *poll_err;
171 	struct got_imsg_error ierr;
172 	int ret;
173 
174 	ierr.code = err->code;
175 	if (err->code == GOT_ERR_ERRNO)
176 		ierr.errno_code = errno;
177 	else
178 		ierr.errno_code = 0;
179 	ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
180 	if (ret == -1) {
181 		fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
182 		    getprogname(), err->code, err->msg, strerror(errno));
183 		return;
184 	}
185 
186 	poll_err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
187 	if (poll_err) {
188 		fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
189 		    getprogname(), err->code, err->msg, poll_err->msg);
190 		return;
191 	}
192 
193 	ret = imsg_flush(ibuf);
194 	if (ret == -1) {
195 		fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
196 		    getprogname(), err->code, err->msg, strerror(errno));
197 		return;
198 	}
199 }
200 
201 static const struct got_error *
202 flush_imsg(struct imsgbuf *ibuf)
203 {
204 	const struct got_error *err;
205 
206 	err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
207 	if (err)
208 		return err;
209 
210 	if (imsg_flush(ibuf) == -1)
211 		return got_error_from_errno("imsg_flush");
212 
213 	return NULL;
214 }
215 
216 const struct got_error *
217 got_privsep_send_stop(int fd)
218 {
219 	const struct got_error *err = NULL;
220 	struct imsgbuf ibuf;
221 
222 	imsg_init(&ibuf, fd);
223 
224 	if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
225 		return got_error_from_errno("imsg_compose STOP");
226 
227 	err = flush_imsg(&ibuf);
228 	imsg_clear(&ibuf);
229 	return err;
230 }
231 
232 const struct got_error *
233 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd)
234 {
235 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_REQUEST, 0, 0, fd, NULL, 0)
236 	    == -1)
237 		return got_error_from_errno("imsg_compose OBJECT_REQUEST");
238 
239 	return flush_imsg(ibuf);
240 }
241 
242 const struct got_error *
243 got_privsep_send_commit_req(struct imsgbuf *ibuf, int fd,
244     struct got_object_id *id, int pack_idx)
245 {
246 	const struct got_error *err = NULL;
247 	struct got_imsg_packed_object iobj, *iobjp;
248 	size_t len;
249 
250 	if (id) { /* commit is packed */
251 		iobj.idx = pack_idx;
252 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
253 		iobjp = &iobj;
254 		len = sizeof(iobj);
255 	} else {
256 		iobjp = NULL;
257 		len = 0;
258 	}
259 
260 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_REQUEST, 0, 0, fd, iobjp, len)
261 	    == -1) {
262 		err = got_error_from_errno("imsg_compose COMMIT_REQUEST");
263 		close(fd);
264 		return err;
265 	}
266 
267 	return flush_imsg(ibuf);
268 }
269 
270 const struct got_error *
271 got_privsep_send_tree_req(struct imsgbuf *ibuf, int fd,
272     struct got_object_id *id, int pack_idx)
273 {
274 	const struct got_error *err = NULL;
275 	struct ibuf *wbuf;
276 	size_t len = id ? sizeof(struct got_imsg_packed_object) : 0;
277 
278 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_REQUEST, 0, 0, len);
279 	if (wbuf == NULL)
280 		return got_error_from_errno("imsg_create TREE_REQUEST");
281 
282 	if (id) { /* tree is packed */
283 		if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1) {
284 			err = got_error_from_errno("imsg_add TREE_ENTRY");
285 			ibuf_free(wbuf);
286 			return err;
287 		}
288 
289 		if (imsg_add(wbuf, &pack_idx, sizeof(pack_idx)) == -1) {
290 			err = got_error_from_errno("imsg_add TREE_ENTRY");
291 			ibuf_free(wbuf);
292 			return err;
293 		}
294 	}
295 
296 	wbuf->fd = fd;
297 	imsg_close(ibuf, wbuf);
298 
299 	return flush_imsg(ibuf);
300 }
301 
302 const struct got_error *
303 got_privsep_send_tag_req(struct imsgbuf *ibuf, int fd,
304     struct got_object_id *id, int pack_idx)
305 {
306 	struct got_imsg_packed_object iobj, *iobjp;
307 	size_t len;
308 
309 	if (id) { /* tag is packed */
310 		iobj.idx = pack_idx;
311 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
312 		iobjp = &iobj;
313 		len = sizeof(iobj);
314 	} else {
315 		iobjp = NULL;
316 		len = 0;
317 	}
318 
319 	if (imsg_compose(ibuf, GOT_IMSG_TAG_REQUEST, 0, 0, fd, iobjp, len)
320 	    == -1)
321 		return got_error_from_errno("imsg_compose TAG_REQUEST");
322 
323 	return flush_imsg(ibuf);
324 }
325 
326 const struct got_error *
327 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd,
328     struct got_object_id *id, int pack_idx)
329 {
330 	const struct got_error *err = NULL;
331 	struct got_imsg_packed_object iobj, *iobjp;
332 	size_t len;
333 
334 	if (id) { /* blob is packed */
335 		iobj.idx = pack_idx;
336 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
337 		iobjp = &iobj;
338 		len = sizeof(iobj);
339 	} else {
340 		iobjp = NULL;
341 		len = 0;
342 	}
343 
344 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, iobjp, len)
345 	    == -1) {
346 		err = got_error_from_errno("imsg_compose BLOB_REQUEST");
347 		close(infd);
348 		return err;
349 	}
350 
351 	return flush_imsg(ibuf);
352 }
353 
354 const struct got_error *
355 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
356 {
357 	const struct got_error *err = NULL;
358 
359 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
360 	    == -1) {
361 		err = got_error_from_errno("imsg_compose BLOB_OUTFD");
362 		close(outfd);
363 		return err;
364 	}
365 
366 	return flush_imsg(ibuf);
367 }
368 
369 const struct got_error *
370 got_privsep_send_tmpfd(struct imsgbuf *ibuf, int fd)
371 {
372 	const struct got_error *err = NULL;
373 
374 	if (imsg_compose(ibuf, GOT_IMSG_TMPFD, 0, 0, fd, NULL, 0)
375 	    == -1) {
376 		err = got_error_from_errno("imsg_compose TMPFD");
377 		close(fd);
378 		return err;
379 	}
380 
381 	return flush_imsg(ibuf);
382 }
383 
384 const struct got_error *
385 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
386 {
387 	struct got_imsg_object iobj;
388 
389 	memcpy(iobj.id, obj->id.sha1, sizeof(iobj.id));
390 	iobj.type = obj->type;
391 	iobj.flags = obj->flags;
392 	iobj.hdrlen = obj->hdrlen;
393 	iobj.size = obj->size;
394 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
395 		iobj.pack_offset = obj->pack_offset;
396 		iobj.pack_idx = obj->pack_idx;
397 	}
398 
399 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
400 	    == -1)
401 		return got_error_from_errno("imsg_compose OBJECT");
402 
403 	return flush_imsg(ibuf);
404 }
405 
406 const struct got_error *
407 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
408     struct imsgbuf *ibuf)
409 {
410 	const struct got_error *err = NULL;
411 	struct got_imsg_object *iobj;
412 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
413 
414 	if (datalen != sizeof(*iobj))
415 		return got_error(GOT_ERR_PRIVSEP_LEN);
416 	iobj = imsg->data;
417 
418 	*obj = calloc(1, sizeof(**obj));
419 	if (*obj == NULL)
420 		return got_error_from_errno("calloc");
421 
422 	memcpy((*obj)->id.sha1, iobj->id, SHA1_DIGEST_LENGTH);
423 	(*obj)->type = iobj->type;
424 	(*obj)->flags = iobj->flags;
425 	(*obj)->hdrlen = iobj->hdrlen;
426 	(*obj)->size = iobj->size;
427 	/* path_packfile is handled by caller */
428 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
429 		(*obj)->pack_offset = iobj->pack_offset;
430 		(*obj)->pack_idx = iobj->pack_idx;
431 	}
432 
433 	return err;
434 }
435 
436 const struct got_error *
437 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
438 {
439 	const struct got_error *err = NULL;
440 	struct imsg imsg;
441 	const size_t min_datalen =
442 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
443 
444 	*obj = NULL;
445 
446 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
447 	if (err)
448 		return err;
449 
450 	switch (imsg.hdr.type) {
451 	case GOT_IMSG_OBJECT:
452 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
453 		break;
454 	default:
455 		err = got_error(GOT_ERR_PRIVSEP_MSG);
456 		break;
457 	}
458 
459 	imsg_free(&imsg);
460 
461 	return err;
462 }
463 
464 static const struct got_error *
465 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
466     size_t logmsg_len)
467 {
468 	const struct got_error *err = NULL;
469 	size_t offset, remain;
470 
471 	offset = 0;
472 	remain = logmsg_len;
473 	while (remain > 0) {
474 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
475 
476 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
477 		    commit->logmsg + offset, n) == -1) {
478 			err = got_error_from_errno("imsg_compose "
479 			    "COMMIT_LOGMSG");
480 			break;
481 		}
482 
483 		err = flush_imsg(ibuf);
484 		if (err)
485 			break;
486 
487 		offset += n;
488 		remain -= n;
489 	}
490 
491 	return err;
492 }
493 
494 const struct got_error *
495 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
496 {
497 	const struct got_error *err = NULL;
498 	struct got_imsg_commit_object *icommit;
499 	uint8_t *buf;
500 	size_t len, total;
501 	struct got_object_qid *qid;
502 	size_t author_len = strlen(commit->author);
503 	size_t committer_len = strlen(commit->committer);
504 	size_t logmsg_len = strlen(commit->logmsg);
505 
506 	total = sizeof(*icommit) + author_len + committer_len +
507 	    commit->nparents * SHA1_DIGEST_LENGTH;
508 
509 	buf = malloc(total);
510 	if (buf == NULL)
511 		return got_error_from_errno("malloc");
512 
513 	icommit = (struct got_imsg_commit_object *)buf;
514 	memcpy(icommit->tree_id, commit->tree_id->sha1,
515 	    sizeof(icommit->tree_id));
516 	icommit->author_len = author_len;
517 	icommit->author_time = commit->author_time;
518 	icommit->author_gmtoff = commit->author_gmtoff;
519 	icommit->committer_len = committer_len;
520 	icommit->committer_time = commit->committer_time;
521 	icommit->committer_gmtoff = commit->committer_gmtoff;
522 	icommit->logmsg_len = logmsg_len;
523 	icommit->nparents = commit->nparents;
524 
525 	len = sizeof(*icommit);
526 	memcpy(buf + len, commit->author, author_len);
527 	len += author_len;
528 	memcpy(buf + len, commit->committer, committer_len);
529 	len += committer_len;
530 	SIMPLEQ_FOREACH(qid, &commit->parent_ids, entry) {
531 		memcpy(buf + len, qid->id, SHA1_DIGEST_LENGTH);
532 		len += SHA1_DIGEST_LENGTH;
533 	}
534 
535 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
536 		err = got_error_from_errno("imsg_compose COMMIT");
537 		goto done;
538 	}
539 
540 	if (logmsg_len == 0 ||
541 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
542 		err = flush_imsg(ibuf);
543 		if (err)
544 			goto done;
545 	}
546 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
547 done:
548 	free(buf);
549 	return err;
550 }
551 
552 const struct got_error *
553 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
554 {
555 	const struct got_error *err = NULL;
556 	struct imsg imsg;
557 	struct got_imsg_commit_object *icommit;
558 	size_t len, datalen;
559 	int i;
560 	const size_t min_datalen =
561 	    MIN(sizeof(struct got_imsg_error),
562 	    sizeof(struct got_imsg_commit_object));
563 
564 	*commit = NULL;
565 
566 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
567 	if (err)
568 		return err;
569 
570 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
571 	len = 0;
572 
573 	switch (imsg.hdr.type) {
574 	case GOT_IMSG_COMMIT:
575 		if (datalen < sizeof(*icommit)) {
576 			err = got_error(GOT_ERR_PRIVSEP_LEN);
577 			break;
578 		}
579 		icommit = imsg.data;
580 		if (datalen != sizeof(*icommit) + icommit->author_len +
581 		    icommit->committer_len +
582 		    icommit->nparents * SHA1_DIGEST_LENGTH) {
583 			err = got_error(GOT_ERR_PRIVSEP_LEN);
584 			break;
585 		}
586 		if (icommit->nparents < 0) {
587 			err = got_error(GOT_ERR_PRIVSEP_LEN);
588 			break;
589 		}
590 		len += sizeof(*icommit);
591 
592 		*commit = got_object_commit_alloc_partial();
593 		if (*commit == NULL) {
594 			err = got_error_from_errno(
595 			    "got_object_commit_alloc_partial");
596 			break;
597 		}
598 
599 		memcpy((*commit)->tree_id->sha1, icommit->tree_id,
600 		    SHA1_DIGEST_LENGTH);
601 		(*commit)->author_time = icommit->author_time;
602 		(*commit)->author_gmtoff = icommit->author_gmtoff;
603 		(*commit)->committer_time = icommit->committer_time;
604 		(*commit)->committer_gmtoff = icommit->committer_gmtoff;
605 
606 		if (icommit->author_len == 0) {
607 			(*commit)->author = strdup("");
608 			if ((*commit)->author == NULL) {
609 				err = got_error_from_errno("strdup");
610 				break;
611 			}
612 		} else {
613 			(*commit)->author = malloc(icommit->author_len + 1);
614 			if ((*commit)->author == NULL) {
615 				err = got_error_from_errno("malloc");
616 				break;
617 			}
618 			memcpy((*commit)->author, imsg.data + len,
619 			    icommit->author_len);
620 			(*commit)->author[icommit->author_len] = '\0';
621 		}
622 		len += icommit->author_len;
623 
624 		if (icommit->committer_len == 0) {
625 			(*commit)->committer = strdup("");
626 			if ((*commit)->committer == NULL) {
627 				err = got_error_from_errno("strdup");
628 				break;
629 			}
630 		} else {
631 			(*commit)->committer =
632 			    malloc(icommit->committer_len + 1);
633 			if ((*commit)->committer == NULL) {
634 				err = got_error_from_errno("malloc");
635 				break;
636 			}
637 			memcpy((*commit)->committer, imsg.data + len,
638 			    icommit->committer_len);
639 			(*commit)->committer[icommit->committer_len] = '\0';
640 		}
641 		len += icommit->committer_len;
642 
643 		if (icommit->logmsg_len == 0) {
644 			(*commit)->logmsg = strdup("");
645 			if ((*commit)->logmsg == NULL) {
646 				err = got_error_from_errno("strdup");
647 				break;
648 			}
649 		} else {
650 			size_t offset = 0, remain = icommit->logmsg_len;
651 
652 			(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
653 			if ((*commit)->logmsg == NULL) {
654 				err = got_error_from_errno("malloc");
655 				break;
656 			}
657 			while (remain > 0) {
658 				struct imsg imsg_log;
659 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
660 				    remain);
661 
662 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
663 				if (err)
664 					return err;
665 
666 				if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG)
667 					return got_error(GOT_ERR_PRIVSEP_MSG);
668 
669 				memcpy((*commit)->logmsg + offset,
670 				    imsg_log.data, n);
671 				imsg_free(&imsg_log);
672 				offset += n;
673 				remain -= n;
674 			}
675 			(*commit)->logmsg[icommit->logmsg_len] = '\0';
676 		}
677 
678 		for (i = 0; i < icommit->nparents; i++) {
679 			struct got_object_qid *qid;
680 
681 			err = got_object_qid_alloc_partial(&qid);
682 			if (err)
683 				break;
684 			memcpy(qid->id, imsg.data + len +
685 			    i * SHA1_DIGEST_LENGTH, sizeof(*qid->id));
686 			SIMPLEQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
687 			(*commit)->nparents++;
688 		}
689 		break;
690 	default:
691 		err = got_error(GOT_ERR_PRIVSEP_MSG);
692 		break;
693 	}
694 
695 	imsg_free(&imsg);
696 
697 	return err;
698 }
699 
700 const struct got_error *
701 got_privsep_send_tree(struct imsgbuf *ibuf, struct got_pathlist_head *entries,
702     int nentries)
703 {
704 	const struct got_error *err = NULL;
705 	struct got_imsg_tree_object itree;
706 	struct got_pathlist_entry *pe;
707 	size_t totlen;
708 	int nimsg; /* number of imsg queued in ibuf */
709 
710 	itree.nentries = nentries;
711 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
712 	    == -1)
713 		return got_error_from_errno("imsg_compose TREE");
714 
715 	totlen = sizeof(itree);
716 	nimsg = 1;
717 	TAILQ_FOREACH(pe, entries, entry) {
718 		const char *name = pe->path;
719 		struct got_parsed_tree_entry *pte = pe->data;
720 		struct ibuf *wbuf;
721 		size_t namelen = strlen(name);
722 		size_t len = sizeof(struct got_imsg_tree_entry) + namelen;
723 
724 		if (len > MAX_IMSGSIZE)
725 			return got_error(GOT_ERR_NO_SPACE);
726 
727 		nimsg++;
728 		if (totlen + len >= MAX_IMSGSIZE - (IMSG_HEADER_SIZE * nimsg)) {
729 			err = flush_imsg(ibuf);
730 			if (err)
731 				return err;
732 			nimsg = 0;
733 		}
734 
735 		wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRY, 0, 0, len);
736 		if (wbuf == NULL)
737 			return got_error_from_errno("imsg_create TREE_ENTRY");
738 
739 		/* Keep in sync with struct got_imsg_tree_object definition! */
740 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1) {
741 			err = got_error_from_errno("imsg_add TREE_ENTRY");
742 			ibuf_free(wbuf);
743 			return err;
744 		}
745 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1) {
746 			err = got_error_from_errno("imsg_add TREE_ENTRY");
747 			ibuf_free(wbuf);
748 			return err;
749 		}
750 
751 		if (imsg_add(wbuf, name, namelen) == -1) {
752 			err = got_error_from_errno("imsg_add TREE_ENTRY");
753 			ibuf_free(wbuf);
754 			return err;
755 		}
756 
757 		wbuf->fd = -1;
758 		imsg_close(ibuf, wbuf);
759 
760 		totlen += len;
761 	}
762 
763 	return flush_imsg(ibuf);
764 }
765 
766 const struct got_error *
767 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
768 {
769 	const struct got_error *err = NULL;
770 	const size_t min_datalen =
771 	    MIN(sizeof(struct got_imsg_error),
772 	    sizeof(struct got_imsg_tree_object));
773 	struct got_imsg_tree_object *itree;
774 	int nentries = 0;
775 
776 	*tree = NULL;
777 get_more:
778 	err = read_imsg(ibuf);
779 	if (err)
780 		goto done;
781 
782 	for (;;) {
783 		struct imsg imsg;
784 		size_t n;
785 		size_t datalen;
786 		struct got_imsg_tree_entry *ite;
787 		struct got_tree_entry *te = NULL;
788 
789 		n = imsg_get(ibuf, &imsg);
790 		if (n == 0) {
791 			if (*tree && (*tree)->nentries != nentries)
792 				goto get_more;
793 			break;
794 		}
795 
796 		if (imsg.hdr.len < IMSG_HEADER_SIZE + min_datalen)
797 			return got_error(GOT_ERR_PRIVSEP_LEN);
798 
799 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
800 
801 		switch (imsg.hdr.type) {
802 		case GOT_IMSG_ERROR:
803 			err = recv_imsg_error(&imsg, datalen);
804 			break;
805 		case GOT_IMSG_TREE:
806 			/* This message should only appear once. */
807 			if (*tree != NULL) {
808 				err = got_error(GOT_ERR_PRIVSEP_MSG);
809 				break;
810 			}
811 			if (datalen != sizeof(*itree)) {
812 				err = got_error(GOT_ERR_PRIVSEP_LEN);
813 				break;
814 			}
815 			itree = imsg.data;
816 			*tree = malloc(sizeof(**tree));
817 			if (*tree == NULL) {
818 				err = got_error_from_errno("malloc");
819 				break;
820 			}
821 			(*tree)->entries = calloc(itree->nentries,
822 			    sizeof(struct got_tree_entry));
823 			if ((*tree)->entries == NULL) {
824 				err = got_error_from_errno("malloc");
825 				break;
826 			}
827 			(*tree)->nentries = itree->nentries;
828 			(*tree)->refcnt = 0;
829 			break;
830 		case GOT_IMSG_TREE_ENTRY:
831 			/* This message should be preceeded by GOT_IMSG_TREE. */
832 			if (*tree == NULL) {
833 				err = got_error(GOT_ERR_PRIVSEP_MSG);
834 				break;
835 			}
836 			if (datalen < sizeof(*ite) || datalen > MAX_IMSGSIZE) {
837 				err = got_error(GOT_ERR_PRIVSEP_LEN);
838 				break;
839 			}
840 
841 			/* Remaining data contains the entry's name. */
842 			datalen -= sizeof(*ite);
843 			if (datalen == 0 || datalen > MAX_IMSGSIZE) {
844 				err = got_error(GOT_ERR_PRIVSEP_LEN);
845 				break;
846 			}
847 			ite = imsg.data;
848 
849 			if (datalen + 1 > sizeof(te->name)) {
850 				err = got_error(GOT_ERR_NO_SPACE);
851 				break;
852 			}
853 			te = &(*tree)->entries[nentries];
854 			memcpy(te->name, imsg.data + sizeof(*ite), datalen);
855 			te->name[datalen] = '\0';
856 
857 			memcpy(te->id.sha1, ite->id, SHA1_DIGEST_LENGTH);
858 			te->mode = ite->mode;
859 			te->idx = nentries;
860 			nentries++;
861 			break;
862 		default:
863 			err = got_error(GOT_ERR_PRIVSEP_MSG);
864 			break;
865 		}
866 
867 		imsg_free(&imsg);
868 	}
869 done:
870 	if (*tree && (*tree)->nentries != nentries) {
871 		if (err == NULL)
872 			err = got_error(GOT_ERR_PRIVSEP_LEN);
873 		got_object_tree_close(*tree);
874 		*tree = NULL;
875 	}
876 
877 	return err;
878 }
879 
880 const struct got_error *
881 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
882     const uint8_t *data)
883 {
884 	struct got_imsg_blob iblob;
885 
886 	iblob.size = size;
887 	iblob.hdrlen = hdrlen;
888 
889 	if (data) {
890 		uint8_t *buf;
891 
892 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
893 			return got_error(GOT_ERR_NO_SPACE);
894 
895 		buf = malloc(sizeof(iblob) + size);
896 		if (buf == NULL)
897 			return got_error_from_errno("malloc");
898 
899 		memcpy(buf, &iblob, sizeof(iblob));
900 		memcpy(buf + sizeof(iblob), data, size);
901 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
902 		   sizeof(iblob) + size) == -1) {
903 			free(buf);
904 			return got_error_from_errno("imsg_compose BLOB");
905 		}
906 		free(buf);
907 	} else {
908 		/* Data has already been written to file descriptor. */
909 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
910 		    sizeof(iblob)) == -1)
911 			return got_error_from_errno("imsg_compose BLOB");
912 	}
913 
914 
915 	return flush_imsg(ibuf);
916 }
917 
918 const struct got_error *
919 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
920     struct imsgbuf *ibuf)
921 {
922 	const struct got_error *err = NULL;
923 	struct imsg imsg;
924 	struct got_imsg_blob *iblob;
925 	size_t datalen;
926 
927 	*outbuf = NULL;
928 
929 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
930 	if (err)
931 		return err;
932 
933 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
934 
935 	switch (imsg.hdr.type) {
936 	case GOT_IMSG_BLOB:
937 		if (datalen < sizeof(*iblob)) {
938 			err = got_error(GOT_ERR_PRIVSEP_LEN);
939 			break;
940 		}
941 		iblob = imsg.data;
942 		*size = iblob->size;
943 		*hdrlen = iblob->hdrlen;
944 
945 		if (datalen == sizeof(*iblob)) {
946 			/* Data has been written to file descriptor. */
947 			break;
948 		}
949 
950 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX) {
951 			err = got_error(GOT_ERR_PRIVSEP_LEN);
952 			break;
953 		}
954 
955 		*outbuf = malloc(*size);
956 		if (*outbuf == NULL) {
957 			err = got_error_from_errno("malloc");
958 			break;
959 		}
960 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
961 		break;
962 	default:
963 		err = got_error(GOT_ERR_PRIVSEP_MSG);
964 		break;
965 	}
966 
967 	imsg_free(&imsg);
968 
969 	return err;
970 }
971 
972 static const struct got_error *
973 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
974 {
975 	const struct got_error *err = NULL;
976 	size_t offset, remain;
977 
978 	offset = 0;
979 	remain = tagmsg_len;
980 	while (remain > 0) {
981 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
982 
983 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
984 		    tag->tagmsg + offset, n) == -1) {
985 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
986 			break;
987 		}
988 
989 		err = flush_imsg(ibuf);
990 		if (err)
991 			break;
992 
993 		offset += n;
994 		remain -= n;
995 	}
996 
997 	return err;
998 }
999 
1000 const struct got_error *
1001 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1002 {
1003 	const struct got_error *err = NULL;
1004 	struct got_imsg_tag_object *itag;
1005 	uint8_t *buf;
1006 	size_t len, total;
1007 	size_t tag_len = strlen(tag->tag);
1008 	size_t tagger_len = strlen(tag->tagger);
1009 	size_t tagmsg_len = strlen(tag->tagmsg);
1010 
1011 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1012 
1013 	buf = malloc(total);
1014 	if (buf == NULL)
1015 		return got_error_from_errno("malloc");
1016 
1017 	itag = (struct got_imsg_tag_object *)buf;
1018 	memcpy(itag->id, tag->id.sha1, sizeof(itag->id));
1019 	itag->obj_type = tag->obj_type;
1020 	itag->tag_len = tag_len;
1021 	itag->tagger_len = tagger_len;
1022 	itag->tagger_time = tag->tagger_time;
1023 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1024 	itag->tagmsg_len = tagmsg_len;
1025 
1026 	len = sizeof(*itag);
1027 	memcpy(buf + len, tag->tag, tag_len);
1028 	len += tag_len;
1029 	memcpy(buf + len, tag->tagger, tagger_len);
1030 	len += tagger_len;
1031 
1032 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1033 		err = got_error_from_errno("imsg_compose TAG");
1034 		goto done;
1035 	}
1036 
1037 	if (tagmsg_len == 0 ||
1038 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1039 		err = flush_imsg(ibuf);
1040 		if (err)
1041 			goto done;
1042 	}
1043 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1044 done:
1045 	free(buf);
1046 	return err;
1047 }
1048 
1049 const struct got_error *
1050 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1051 {
1052 	const struct got_error *err = NULL;
1053 	struct imsg imsg;
1054 	struct got_imsg_tag_object *itag;
1055 	size_t len, datalen;
1056 	const size_t min_datalen =
1057 	    MIN(sizeof(struct got_imsg_error),
1058 	    sizeof(struct got_imsg_tag_object));
1059 
1060 	*tag = NULL;
1061 
1062 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1063 	if (err)
1064 		return err;
1065 
1066 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1067 	len = 0;
1068 
1069 	switch (imsg.hdr.type) {
1070 	case GOT_IMSG_TAG:
1071 		if (datalen < sizeof(*itag)) {
1072 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1073 			break;
1074 		}
1075 		itag = imsg.data;
1076 		if (datalen != sizeof(*itag) + itag->tag_len +
1077 		    itag->tagger_len) {
1078 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1079 			break;
1080 		}
1081 		len += sizeof(*itag);
1082 
1083 		*tag = calloc(1, sizeof(**tag));
1084 		if (*tag == NULL) {
1085 			err = got_error_from_errno("calloc");
1086 			break;
1087 		}
1088 
1089 		memcpy((*tag)->id.sha1, itag->id, SHA1_DIGEST_LENGTH);
1090 
1091 		if (itag->tag_len == 0) {
1092 			(*tag)->tag = strdup("");
1093 			if ((*tag)->tag == NULL) {
1094 				err = got_error_from_errno("strdup");
1095 				break;
1096 			}
1097 		} else {
1098 			(*tag)->tag = malloc(itag->tag_len + 1);
1099 			if ((*tag)->tag == NULL) {
1100 				err = got_error_from_errno("malloc");
1101 				break;
1102 			}
1103 			memcpy((*tag)->tag, imsg.data + len,
1104 			    itag->tag_len);
1105 			(*tag)->tag[itag->tag_len] = '\0';
1106 		}
1107 		len += itag->tag_len;
1108 
1109 		(*tag)->obj_type = itag->obj_type;
1110 		(*tag)->tagger_time = itag->tagger_time;
1111 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1112 
1113 		if (itag->tagger_len == 0) {
1114 			(*tag)->tagger = strdup("");
1115 			if ((*tag)->tagger == NULL) {
1116 				err = got_error_from_errno("strdup");
1117 				break;
1118 			}
1119 		} else {
1120 			(*tag)->tagger = malloc(itag->tagger_len + 1);
1121 			if ((*tag)->tagger == NULL) {
1122 				err = got_error_from_errno("malloc");
1123 				break;
1124 			}
1125 			memcpy((*tag)->tagger, imsg.data + len,
1126 			    itag->tagger_len);
1127 			(*tag)->tagger[itag->tagger_len] = '\0';
1128 		}
1129 		len += itag->tagger_len;
1130 
1131 		if (itag->tagmsg_len == 0) {
1132 			(*tag)->tagmsg = strdup("");
1133 			if ((*tag)->tagmsg == NULL) {
1134 				err = got_error_from_errno("strdup");
1135 				break;
1136 			}
1137 		} else {
1138 			size_t offset = 0, remain = itag->tagmsg_len;
1139 
1140 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1141 			if ((*tag)->tagmsg == NULL) {
1142 				err = got_error_from_errno("malloc");
1143 				break;
1144 			}
1145 			while (remain > 0) {
1146 				struct imsg imsg_log;
1147 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1148 				    remain);
1149 
1150 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1151 				if (err)
1152 					return err;
1153 
1154 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1155 					return got_error(GOT_ERR_PRIVSEP_MSG);
1156 
1157 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1158 				    n);
1159 				imsg_free(&imsg_log);
1160 				offset += n;
1161 				remain -= n;
1162 			}
1163 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1164 		}
1165 
1166 		break;
1167 	default:
1168 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1169 		break;
1170 	}
1171 
1172 	imsg_free(&imsg);
1173 
1174 	return err;
1175 }
1176 
1177 const struct got_error *
1178 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1179     struct got_packidx *packidx)
1180 {
1181 	const struct got_error *err = NULL;
1182 	struct got_imsg_packidx ipackidx;
1183 	struct got_imsg_pack ipack;
1184 	int fd;
1185 
1186 	ipackidx.len = packidx->len;
1187 	fd = dup(packidx->fd);
1188 	if (fd == -1)
1189 		return got_error_from_errno("dup");
1190 
1191 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1192 	    sizeof(ipackidx)) == -1) {
1193 		err = got_error_from_errno("imsg_compose PACKIDX");
1194 		close(fd);
1195 		return err;
1196 	}
1197 
1198 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
1199 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
1200 		return got_error(GOT_ERR_NO_SPACE);
1201 	ipack.filesize = pack->filesize;
1202 
1203 	fd = dup(pack->fd);
1204 	if (fd == -1)
1205 		return got_error_from_errno("dup");
1206 
1207 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
1208 	    == -1) {
1209 		err = got_error_from_errno("imsg_compose PACK");
1210 		close(fd);
1211 		return err;
1212 	}
1213 
1214 	return flush_imsg(ibuf);
1215 }
1216 
1217 const struct got_error *
1218 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
1219     struct got_object_id *id)
1220 {
1221 	struct got_imsg_packed_object iobj;
1222 
1223 	iobj.idx = idx;
1224 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
1225 
1226 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
1227 	    &iobj, sizeof(iobj)) == -1)
1228 		return got_error_from_errno("imsg_compose "
1229 		    "PACKED_OBJECT_REQUEST");
1230 
1231 	return flush_imsg(ibuf);
1232 }
1233 
1234 const struct got_error *
1235 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
1236 {
1237 	const struct got_error *err = NULL;
1238 
1239 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
1240 	    NULL, 0) == -1) {
1241 		err = got_error_from_errno("imsg_compose "
1242 		    "GITCONFIG_PARSE_REQUEST");
1243 		close(fd);
1244 		return err;
1245 	}
1246 
1247 	return flush_imsg(ibuf);
1248 }
1249 
1250 const struct got_error *
1251 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
1252 {
1253 	if (imsg_compose(ibuf,
1254 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
1255 	    NULL, 0) == -1)
1256 		return got_error_from_errno("imsg_compose "
1257 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
1258 
1259 	return flush_imsg(ibuf);
1260 }
1261 
1262 const struct got_error *
1263 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
1264 {
1265 	if (imsg_compose(ibuf,
1266 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
1267 		return got_error_from_errno("imsg_compose "
1268 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
1269 
1270 	return flush_imsg(ibuf);
1271 }
1272 
1273 const struct got_error *
1274 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
1275 {
1276 	if (imsg_compose(ibuf,
1277 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
1278 		return got_error_from_errno("imsg_compose "
1279 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
1280 
1281 	return flush_imsg(ibuf);
1282 }
1283 
1284 const struct got_error *
1285 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
1286 {
1287 	if (imsg_compose(ibuf,
1288 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
1289 		return got_error_from_errno("imsg_compose "
1290 		    "GITCONFIG_REMOTE_REQUEST");
1291 
1292 	return flush_imsg(ibuf);
1293 }
1294 
1295 const struct got_error *
1296 got_privsep_send_gitconfig_str(struct imsgbuf *ibuf, const char *value)
1297 {
1298 	size_t len = value ? strlen(value) + 1 : 0;
1299 
1300 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_STR_VAL, 0, 0, -1,
1301 	    value, len) == -1)
1302 		return got_error_from_errno("imsg_compose GITCONFIG_STR_VAL");
1303 
1304 	return flush_imsg(ibuf);
1305 }
1306 
1307 const struct got_error *
1308 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
1309 {
1310 	const struct got_error *err = NULL;
1311 	struct imsg imsg;
1312 	size_t datalen;
1313 	const size_t min_datalen = 0;
1314 
1315 	*str = NULL;
1316 
1317 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1318 	if (err)
1319 		return err;
1320 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1321 
1322 	switch (imsg.hdr.type) {
1323 	case GOT_IMSG_GITCONFIG_STR_VAL:
1324 		if (datalen == 0)
1325 			break;
1326 		*str = malloc(datalen);
1327 		if (*str == NULL) {
1328 			err = got_error_from_errno("malloc");
1329 			break;
1330 		}
1331 		if (strlcpy(*str, imsg.data, datalen) >= datalen)
1332 			err = got_error(GOT_ERR_NO_SPACE);
1333 		break;
1334 	default:
1335 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1336 		break;
1337 	}
1338 
1339 	imsg_free(&imsg);
1340 	return err;
1341 }
1342 
1343 const struct got_error *
1344 got_privsep_send_gitconfig_int(struct imsgbuf *ibuf, int value)
1345 {
1346 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_INT_VAL, 0, 0, -1,
1347 	    &value, sizeof(value)) == -1)
1348 		return got_error_from_errno("imsg_compose GITCONFIG_INT_VAL");
1349 
1350 	return flush_imsg(ibuf);
1351 }
1352 
1353 const struct got_error *
1354 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
1355 {
1356 	const struct got_error *err = NULL;
1357 	struct imsg imsg;
1358 	size_t datalen;
1359 	const size_t min_datalen =
1360 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
1361 
1362 	*val = 0;
1363 
1364 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1365 	if (err)
1366 		return err;
1367 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1368 
1369 	switch (imsg.hdr.type) {
1370 	case GOT_IMSG_GITCONFIG_INT_VAL:
1371 		if (datalen != sizeof(*val)) {
1372 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1373 			break;
1374 		}
1375 		memcpy(val, imsg.data, sizeof(*val));
1376 		break;
1377 	default:
1378 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1379 		break;
1380 	}
1381 
1382 	imsg_free(&imsg);
1383 	return err;
1384 }
1385 
1386 const struct got_error *
1387 got_privsep_send_gitconfig_remotes(struct imsgbuf *ibuf,
1388     struct got_remote_repo *remotes, int nremotes)
1389 {
1390 	const struct got_error *err = NULL;
1391 	struct got_imsg_remotes iremotes;
1392 	int i;
1393 
1394 	iremotes.nremotes = nremotes;
1395 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_REMOTES, 0, 0, -1,
1396 	    &iremotes, sizeof(iremotes)) == -1)
1397 		return got_error_from_errno("imsg_compose GITCONFIG_REMOTES");
1398 
1399 	err = flush_imsg(ibuf);
1400 	imsg_clear(ibuf);
1401 	if (err)
1402 		return err;
1403 
1404 	for (i = 0; i < nremotes; i++) {
1405 		struct got_imsg_remote iremote;
1406 		size_t len = sizeof(iremote);
1407 		struct ibuf *wbuf;
1408 
1409 		iremote.name_len = strlen(remotes[i].name);
1410 		len += iremote.name_len;
1411 		iremote.url_len = strlen(remotes[i].url);
1412 		len += iremote.url_len;
1413 
1414 		wbuf = imsg_create(ibuf, GOT_IMSG_GITCONFIG_REMOTE, 0, 0, len);
1415 		if (wbuf == NULL)
1416 			return got_error_from_errno(
1417 			    "imsg_create GITCONFIG_REMOTE");
1418 
1419 		if (imsg_add(wbuf, &iremote, sizeof(iremote)) == -1) {
1420 			err = got_error_from_errno(
1421 			    "imsg_add GIITCONFIG_REMOTE");
1422 			ibuf_free(wbuf);
1423 			return err;
1424 		}
1425 
1426 		if (imsg_add(wbuf, remotes[i].name, iremote.name_len) == -1) {
1427 			err = got_error_from_errno(
1428 			    "imsg_add GIITCONFIG_REMOTE");
1429 			ibuf_free(wbuf);
1430 			return err;
1431 		}
1432 		if (imsg_add(wbuf, remotes[i].url, iremote.url_len) == -1) {
1433 			err = got_error_from_errno(
1434 			    "imsg_add GIITCONFIG_REMOTE");
1435 			ibuf_free(wbuf);
1436 			return err;
1437 		}
1438 
1439 		wbuf->fd = -1;
1440 		imsg_close(ibuf, wbuf);
1441 		err = flush_imsg(ibuf);
1442 		if (err)
1443 			return err;
1444 	}
1445 
1446 	return NULL;
1447 }
1448 
1449 const struct got_error *
1450 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
1451     int *nremotes, struct imsgbuf *ibuf)
1452 {
1453 	const struct got_error *err = NULL;
1454 	struct imsg imsg;
1455 	size_t datalen;
1456 	struct got_imsg_remotes iremotes;
1457 	struct got_imsg_remote iremote;
1458 
1459 	*remotes = NULL;
1460 	*nremotes = 0;
1461 
1462 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
1463 	if (err)
1464 		return err;
1465 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1466 
1467 	switch (imsg.hdr.type) {
1468 	case GOT_IMSG_GITCONFIG_REMOTES:
1469 		if (datalen != sizeof(iremotes)) {
1470 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1471 			break;
1472 		}
1473 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
1474 		if (iremotes.nremotes == 0) {
1475 			imsg_free(&imsg);
1476 			return NULL;
1477 		}
1478 		break;
1479 	default:
1480 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1481 		break;
1482 	}
1483 
1484 	imsg_free(&imsg);
1485 
1486 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(iremote));
1487 	if (*remotes == NULL)
1488 		return got_error_from_errno("recallocarray");
1489 
1490 	while (*nremotes < iremotes.nremotes) {
1491 		struct got_remote_repo *remote;
1492 	
1493 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
1494 		if (err)
1495 			break;
1496 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1497 
1498 		switch (imsg.hdr.type) {
1499 		case GOT_IMSG_GITCONFIG_REMOTE:
1500 			remote = &(*remotes)[*nremotes];
1501 			if (datalen < sizeof(iremote)) {
1502 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1503 				break;
1504 			}
1505 			memcpy(&iremote, imsg.data, sizeof(iremote));
1506 			if (iremote.name_len == 0 || iremote.url_len == 0 ||
1507 			    (sizeof(iremote) + iremote.name_len +
1508 			    iremote.url_len) > datalen) {
1509 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1510 				break;
1511 			}
1512 			remote->name = strndup(imsg.data + sizeof(iremote),
1513 			    iremote.name_len);
1514 			if (remote->name == NULL) {
1515 				err = got_error_from_errno("strndup");
1516 				break;
1517 			}
1518 			remote->url = strndup(imsg.data + sizeof(iremote) +
1519 			    iremote.name_len, iremote.url_len);
1520 			if (remote->url == NULL) {
1521 				err = got_error_from_errno("strndup");
1522 				free(remote->name);
1523 				break;
1524 			}
1525 			(*nremotes)++;
1526 			break;
1527 		default:
1528 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1529 			break;
1530 		}
1531 
1532 		imsg_free(&imsg);
1533 		if (err)
1534 			break;
1535 	}
1536 
1537 	if (err) {
1538 		int i;
1539 		for (i = 0; i < *nremotes; i++) {
1540 			free((*remotes)[i].name);
1541 			free((*remotes)[i].url);
1542 		}
1543 		free(*remotes);
1544 		*remotes = NULL;
1545 		*nremotes = 0;
1546 	}
1547 	return err;
1548 }
1549 
1550 const struct got_error *
1551 got_privsep_unveil_exec_helpers(void)
1552 {
1553 	const char *helpers[] = {
1554 	    GOT_PATH_PROG_READ_PACK,
1555 	    GOT_PATH_PROG_READ_OBJECT,
1556 	    GOT_PATH_PROG_READ_COMMIT,
1557 	    GOT_PATH_PROG_READ_TREE,
1558 	    GOT_PATH_PROG_READ_BLOB,
1559 	    GOT_PATH_PROG_READ_TAG,
1560 	    GOT_PATH_PROG_READ_GITCONFIG,
1561 	};
1562 	int i;
1563 
1564 	for (i = 0; i < nitems(helpers); i++) {
1565 		if (unveil(helpers[i], "x") == 0)
1566 			continue;
1567 		return got_error_from_errno2("unveil", helpers[i]);
1568 	}
1569 
1570 	return NULL;
1571 }
1572 
1573 void
1574 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
1575 {
1576 	if (close(imsg_fds[0]) != 0) {
1577 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
1578 		_exit(1);
1579 	}
1580 
1581 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
1582 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
1583 		_exit(1);
1584 	}
1585 	if (closefrom(GOT_IMSG_FD_CHILD + 1) == -1) {
1586 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
1587 		_exit(1);
1588 	}
1589 
1590 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
1591 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
1592 		    strerror(errno));
1593 		_exit(1);
1594 	}
1595 }