2 * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
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.
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.
17 #include <sys/types.h>
18 #include <sys/queue.h>
20 #include <sys/syslimits.h>
34 #include "got_object.h"
35 #include "got_error.h"
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"
46 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
49 static const struct got_error *
50 poll_fd(int fd, int events, int timeout)
56 pfd[0].events = events;
58 n = poll(pfd, 1, timeout);
60 return got_error_from_errno();
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))
68 return got_error(GOT_ERR_INTERRUPT);
71 static const struct got_error *
72 read_imsg(struct imsgbuf *ibuf)
74 const struct got_error *err;
77 err = poll_fd(ibuf->fd, POLLIN, INFTIM);
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);
88 return got_error(GOT_ERR_PRIVSEP_PIPE);
93 const struct got_error *
94 got_privsep_wait_for_child(pid_t pid)
98 waitpid(pid, &child_status, 0);
100 if (!WIFEXITED(child_status))
101 return got_error(GOT_ERR_PRIVSEP_DIED);
103 if (WEXITSTATUS(child_status) != 0)
104 return got_error(GOT_ERR_PRIVSEP_EXIT);
109 static const struct got_error *
110 recv_imsg_error(struct imsg *imsg, size_t datalen)
112 struct got_imsg_error *ierr;
114 if (datalen != sizeof(*ierr))
115 return got_error(GOT_ERR_PRIVSEP_LEN);
118 if (ierr->code == GOT_ERR_ERRNO) {
119 static struct got_error serr;
120 serr.code = GOT_ERR_ERRNO;
121 serr.msg = strerror(ierr->errno_code);
125 return got_error(ierr->code);
128 const struct got_error *
129 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf,
132 const struct got_error *err;
135 n = imsg_get(ibuf, imsg);
137 return got_error_from_errno();
140 err = read_imsg(ibuf);
143 n = imsg_get(ibuf, imsg);
146 if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
147 return got_error(GOT_ERR_PRIVSEP_LEN);
149 if (imsg->hdr.type == GOT_IMSG_ERROR) {
150 size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
151 return recv_imsg_error(imsg, datalen);
157 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
159 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
161 const struct got_error *poll_err;
162 struct got_imsg_error ierr;
165 ierr.code = err->code;
166 if (err->code == GOT_ERR_ERRNO)
167 ierr.errno_code = errno;
170 ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
172 fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
173 getprogname(), err->code, err->msg, strerror(errno));
177 poll_err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
179 fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
180 getprogname(), err->code, err->msg, poll_err->msg);
184 ret = imsg_flush(ibuf);
186 fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
187 getprogname(), err->code, err->msg, strerror(errno));
192 static const struct got_error *
193 flush_imsg(struct imsgbuf *ibuf)
195 const struct got_error *err;
197 err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
201 if (imsg_flush(ibuf) == -1)
202 return got_error_from_errno();
207 const struct got_error *
208 got_privsep_send_stop(int fd)
210 const struct got_error *err = NULL;
213 imsg_init(&ibuf, fd);
215 if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
216 return got_error_from_errno();
218 err = flush_imsg(&ibuf);
223 const struct got_error *
224 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd, struct got_object *obj)
226 struct got_imsg_object iobj, *iobjp = NULL;
227 size_t iobj_size = 0;
228 int imsg_code = GOT_IMSG_OBJECT_REQUEST;
232 case GOT_OBJ_TYPE_TREE:
233 imsg_code = GOT_IMSG_TREE_REQUEST;
235 case GOT_OBJ_TYPE_COMMIT:
236 imsg_code = GOT_IMSG_COMMIT_REQUEST;
238 case GOT_OBJ_TYPE_BLOB:
239 imsg_code = GOT_IMSG_BLOB_REQUEST;
242 return got_error(GOT_ERR_OBJ_TYPE);
245 memcpy(iobj.id, obj->id.sha1, sizeof(iobj.id));
246 iobj.type = obj->type;
247 iobj.flags = obj->flags;
248 iobj.hdrlen = obj->hdrlen;
249 iobj.size = obj->size;
250 if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
251 iobj.pack_offset = obj->pack_offset;
252 iobj.pack_idx = obj->pack_idx;
256 iobj_size = sizeof(iobj);
259 if (imsg_compose(ibuf, imsg_code, 0, 0, fd, iobjp, iobj_size) == -1)
260 return got_error_from_errno();
262 return flush_imsg(ibuf);
265 const struct got_error *
266 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd)
268 if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, NULL, 0)
270 return got_error_from_errno();
272 return flush_imsg(ibuf);
275 const struct got_error *
276 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
278 if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
280 return got_error_from_errno();
282 return flush_imsg(ibuf);
285 const struct got_error *
286 got_privsep_send_tmpfd(struct imsgbuf *ibuf, int fd)
288 if (imsg_compose(ibuf, GOT_IMSG_TMPFD, 0, 0, fd, NULL, 0)
290 return got_error_from_errno();
292 return flush_imsg(ibuf);
295 const struct got_error *
296 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
298 struct got_imsg_object iobj;
300 memcpy(iobj.id, obj->id.sha1, sizeof(iobj.id));
301 iobj.type = obj->type;
302 iobj.flags = obj->flags;
303 iobj.hdrlen = obj->hdrlen;
304 iobj.size = obj->size;
305 if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
306 iobj.pack_offset = obj->pack_offset;
307 iobj.pack_idx = obj->pack_idx;
310 if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
312 return got_error_from_errno();
314 return flush_imsg(ibuf);
317 const struct got_error *
318 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
319 struct imsgbuf *ibuf)
321 const struct got_error *err = NULL;
322 struct got_imsg_object *iobj;
323 size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
325 if (datalen != sizeof(*iobj))
326 return got_error(GOT_ERR_PRIVSEP_LEN);
329 *obj = calloc(1, sizeof(**obj));
331 return got_error_from_errno();
333 memcpy((*obj)->id.sha1, iobj->id, SHA1_DIGEST_LENGTH);
334 (*obj)->type = iobj->type;
335 (*obj)->flags = iobj->flags;
336 (*obj)->hdrlen = iobj->hdrlen;
337 (*obj)->size = iobj->size;
338 /* path_packfile is handled by caller */
339 if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
340 (*obj)->pack_offset = iobj->pack_offset;
341 (*obj)->pack_idx = iobj->pack_idx;
347 const struct got_error *
348 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
350 const struct got_error *err = NULL;
353 const size_t min_datalen =
354 MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
358 err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
362 datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
364 switch (imsg.hdr.type) {
365 case GOT_IMSG_OBJECT:
366 err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
369 err = got_error(GOT_ERR_PRIVSEP_MSG);
378 static const struct got_error *
379 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
382 const struct got_error *err = NULL;
383 size_t offset, remain;
388 size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
390 if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
391 commit->logmsg + offset, n) == -1) {
392 err = got_error_from_errno();
396 err = flush_imsg(ibuf);
407 const struct got_error *
408 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
410 const struct got_error *err = NULL;
411 struct got_imsg_commit_object *icommit;
414 struct got_object_qid *qid;
415 size_t author_len = strlen(commit->author);
416 size_t committer_len = strlen(commit->committer);
417 size_t logmsg_len = strlen(commit->logmsg);
419 total = sizeof(*icommit) + author_len + committer_len +
420 commit->nparents * SHA1_DIGEST_LENGTH;
424 return got_error_from_errno();
426 icommit = (struct got_imsg_commit_object *)buf;
427 memcpy(icommit->tree_id, commit->tree_id->sha1, sizeof(icommit->tree_id));
428 icommit->author_len = author_len;
429 icommit->author_time = commit->author_time;
430 icommit->author_gmtoff = commit->author_gmtoff;
431 icommit->committer_len = committer_len;
432 icommit->committer_time = commit->committer_time;
433 icommit->committer_gmtoff = commit->committer_gmtoff;
434 icommit->logmsg_len = logmsg_len;
435 icommit->nparents = commit->nparents;
437 len = sizeof(*icommit);
438 memcpy(buf + len, commit->author, author_len);
440 memcpy(buf + len, commit->committer, committer_len);
441 len += committer_len;
442 SIMPLEQ_FOREACH(qid, &commit->parent_ids, entry) {
443 memcpy(buf + len, qid->id, SHA1_DIGEST_LENGTH);
444 len += SHA1_DIGEST_LENGTH;
447 if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
448 err = got_error_from_errno();
452 if (logmsg_len == 0 ||
453 logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
454 err = flush_imsg(ibuf);
458 err = send_commit_logmsg(ibuf, commit, logmsg_len);
464 const struct got_error *
465 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
467 const struct got_error *err = NULL;
469 struct got_imsg_commit_object *icommit;
472 const size_t min_datalen =
473 MIN(sizeof(struct got_imsg_error),
474 sizeof(struct got_imsg_commit_object));
478 err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
482 datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
485 switch (imsg.hdr.type) {
486 case GOT_IMSG_COMMIT:
487 if (datalen < sizeof(*icommit)) {
488 err = got_error(GOT_ERR_PRIVSEP_LEN);
492 if (datalen != sizeof(*icommit) + icommit->author_len +
493 icommit->committer_len +
494 icommit->nparents * SHA1_DIGEST_LENGTH) {
495 err = got_error(GOT_ERR_PRIVSEP_LEN);
498 if (icommit->nparents < 0) {
499 err = got_error(GOT_ERR_PRIVSEP_LEN);
502 len += sizeof(*icommit);
504 *commit = got_object_commit_alloc_partial();
505 if (*commit == NULL) {
506 err = got_error_from_errno();
510 memcpy((*commit)->tree_id->sha1, icommit->tree_id,
512 (*commit)->author_time = icommit->author_time;
513 (*commit)->author_gmtoff = icommit->author_gmtoff;
514 (*commit)->committer_time = icommit->committer_time;
515 (*commit)->committer_gmtoff = icommit->committer_gmtoff;
517 if (icommit->author_len == 0) {
518 (*commit)->author = strdup("");
519 if ((*commit)->author == NULL) {
520 err = got_error_from_errno();
524 (*commit)->author = malloc(icommit->author_len + 1);
525 if ((*commit)->author == NULL) {
526 err = got_error_from_errno();
529 memcpy((*commit)->author, imsg.data + len,
530 icommit->author_len);
531 (*commit)->author[icommit->author_len] = '\0';
533 len += icommit->author_len;
535 if (icommit->committer_len == 0) {
536 (*commit)->committer = strdup("");
537 if ((*commit)->committer == NULL) {
538 err = got_error_from_errno();
542 (*commit)->committer =
543 malloc(icommit->committer_len + 1);
544 if ((*commit)->committer == NULL) {
545 err = got_error_from_errno();
548 memcpy((*commit)->committer, imsg.data + len,
549 icommit->committer_len);
550 (*commit)->committer[icommit->committer_len] = '\0';
552 len += icommit->committer_len;
554 if (icommit->logmsg_len == 0) {
555 (*commit)->logmsg = strdup("");
556 if ((*commit)->logmsg == NULL) {
557 err = got_error_from_errno();
561 size_t offset = 0, remain = icommit->logmsg_len;
563 (*commit)->logmsg = malloc(icommit->logmsg_len + 1);
564 if ((*commit)->logmsg == NULL) {
565 err = got_error_from_errno();
569 struct imsg imsg_log;
570 size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
573 err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
577 if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG)
578 return got_error(GOT_ERR_PRIVSEP_MSG);
580 memcpy((*commit)->logmsg + offset,
582 imsg_free(&imsg_log);
586 (*commit)->logmsg[icommit->logmsg_len] = '\0';
589 for (i = 0; i < icommit->nparents; i++) {
590 struct got_object_qid *qid;
592 err = got_object_qid_alloc_partial(&qid);
595 memcpy(qid->id, imsg.data + len +
596 i * SHA1_DIGEST_LENGTH, sizeof(*qid->id));
597 SIMPLEQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
598 (*commit)->nparents++;
602 err = got_error(GOT_ERR_PRIVSEP_MSG);
611 const struct got_error *
612 got_privsep_send_tree(struct imsgbuf *ibuf, struct got_tree_object *tree)
614 const struct got_error *err = NULL;
615 struct got_imsg_tree_object itree;
616 struct got_tree_entry *te;
618 int nimsg; /* number of imsg queued in ibuf */
620 itree.nentries = tree->entries.nentries;
621 if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
623 return got_error_from_errno();
625 totlen = sizeof(itree);
627 SIMPLEQ_FOREACH(te, &tree->entries.head, entry) {
628 struct got_imsg_tree_entry *ite;
630 size_t len = sizeof(*ite) + strlen(te->name);
632 if (len > MAX_IMSGSIZE)
633 return got_error(GOT_ERR_NO_SPACE);
636 if (totlen + len >= MAX_IMSGSIZE - (IMSG_HEADER_SIZE * nimsg)) {
637 err = flush_imsg(ibuf);
645 return got_error_from_errno();
647 ite = (struct got_imsg_tree_entry *)buf;
648 memcpy(ite->id, te->id->sha1, sizeof(ite->id));
649 ite->mode = te->mode;
650 memcpy(buf + sizeof(*ite), te->name, strlen(te->name));
652 if (imsg_compose(ibuf, GOT_IMSG_TREE_ENTRY, 0, 0, -1,
654 err = got_error_from_errno();
661 return flush_imsg(ibuf);
664 const struct got_error *
665 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
667 const struct got_error *err = NULL;
668 const size_t min_datalen =
669 MIN(sizeof(struct got_imsg_error),
670 sizeof(struct got_imsg_tree_object));
671 struct got_imsg_tree_object *itree;
676 err = read_imsg(ibuf);
684 struct got_imsg_tree_entry *ite;
685 struct got_tree_entry *te = NULL;
687 n = imsg_get(ibuf, &imsg);
689 if (*tree && (*tree)->entries.nentries != nentries)
694 if (imsg.hdr.len < IMSG_HEADER_SIZE + min_datalen)
695 return got_error(GOT_ERR_PRIVSEP_LEN);
697 datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
699 switch (imsg.hdr.type) {
701 err = recv_imsg_error(&imsg, datalen);
704 /* This message should only appear once. */
706 err = got_error(GOT_ERR_PRIVSEP_MSG);
709 if (datalen != sizeof(*itree)) {
710 err = got_error(GOT_ERR_PRIVSEP_LEN);
714 *tree = malloc(sizeof(**tree));
716 err = got_error_from_errno();
719 (*tree)->entries.nentries = itree->nentries;
720 SIMPLEQ_INIT(&(*tree)->entries.head);
723 case GOT_IMSG_TREE_ENTRY:
724 /* This message should be preceeded by GOT_IMSG_TREE. */
726 err = got_error(GOT_ERR_PRIVSEP_MSG);
729 if (datalen < sizeof(*ite) || datalen > MAX_IMSGSIZE) {
730 err = got_error(GOT_ERR_PRIVSEP_LEN);
734 /* Remaining data contains the entry's name. */
735 datalen -= sizeof(*ite);
736 if (datalen == 0 || datalen > MAX_IMSGSIZE) {
737 err = got_error(GOT_ERR_PRIVSEP_LEN);
742 te = got_alloc_tree_entry_partial();
744 err = got_error_from_errno();
747 te->name = malloc(datalen + 1);
748 if (te->name == NULL) {
750 err = got_error_from_errno();
753 memcpy(te->name, imsg.data + sizeof(*ite), datalen);
754 te->name[datalen] = '\0';
756 memcpy(te->id->sha1, ite->id, SHA1_DIGEST_LENGTH);
757 te->mode = ite->mode;
758 SIMPLEQ_INSERT_TAIL(&(*tree)->entries.head, te, entry);
762 err = got_error(GOT_ERR_PRIVSEP_MSG);
769 if (*tree && (*tree)->entries.nentries != nentries) {
771 err = got_error(GOT_ERR_PRIVSEP_LEN);
772 got_object_tree_close(*tree);
779 const struct got_error *
780 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size)
782 struct got_imsg_blob iblob;
785 /* Data has already been written to file descriptor. */
787 if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob, sizeof(iblob))
789 return got_error_from_errno();
791 return flush_imsg(ibuf);
794 const struct got_error *
795 got_privsep_recv_blob(size_t *size, struct imsgbuf *ibuf)
797 const struct got_error *err = NULL;
799 struct got_imsg_blob *iblob;
802 err = got_privsep_recv_imsg(&imsg, ibuf, 0);
806 datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
808 switch (imsg.hdr.type) {
810 if (datalen != sizeof(*iblob)) {
811 err = got_error(GOT_ERR_PRIVSEP_LEN);
816 /* Data has been written to file descriptor. */
819 err = got_error(GOT_ERR_PRIVSEP_MSG);
828 const struct got_error *
829 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
830 struct got_packidx *packidx)
832 struct got_imsg_packidx ipackidx;
833 struct got_imsg_pack ipack;
836 ipackidx.len = packidx->len;
837 fd = dup(packidx->fd);
839 return got_error_from_errno();
841 if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
842 sizeof(ipackidx)) == -1)
843 return got_error_from_errno();
845 if (strlcpy(ipack.path_packfile, pack->path_packfile,
846 sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
847 return got_error(GOT_ERR_NO_SPACE);
848 ipack.filesize = pack->filesize;
852 return got_error_from_errno();
854 if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
856 return got_error_from_errno();
858 return flush_imsg(ibuf);
861 const struct got_error *
862 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
863 struct got_object_id *id)
865 struct got_imsg_packed_object iobj;
868 memcpy(iobj.id, id->sha1, sizeof(iobj.id));
870 if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
871 &iobj, sizeof(iobj)) == -1)
872 return got_error_from_errno();
874 return flush_imsg(ibuf);