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 const struct got_error *
110 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf, size_t min_datalen)
112 const struct got_error *err;
115 n = imsg_get(ibuf, imsg);
117 return got_error_from_errno();
120 err = read_imsg(ibuf);
123 n = imsg_get(ibuf, imsg);
126 if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
127 return got_error(GOT_ERR_PRIVSEP_LEN);
132 static const struct got_error *
133 recv_imsg_error(struct imsg *imsg, size_t datalen)
135 struct got_imsg_error ierr;
137 if (datalen != sizeof(ierr))
138 return got_error(GOT_ERR_PRIVSEP_LEN);
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);
148 return got_error(ierr.code);
151 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
153 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
155 const struct got_error *poll_err;
156 struct got_imsg_error ierr;
159 ierr.code = err->code;
160 if (err->code == GOT_ERR_ERRNO)
161 ierr.errno_code = errno;
164 ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
166 fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
167 getprogname(), err->code, err->msg, strerror(errno));
171 poll_err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
173 fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
174 getprogname(), err->code, err->msg, poll_err->msg);
178 ret = imsg_flush(ibuf);
180 fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
181 getprogname(), err->code, err->msg, strerror(errno));
186 static const struct got_error *
187 flush_imsg(struct imsgbuf *ibuf)
189 const struct got_error *err;
191 err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
195 if (imsg_flush(ibuf) == -1)
196 return got_error_from_errno();
201 const struct got_error *
202 got_privsep_send_stop(int fd)
204 const struct got_error *err = NULL;
207 imsg_init(&ibuf, fd);
209 if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
210 return got_error_from_errno();
212 err = flush_imsg(&ibuf);
217 const struct got_error *
218 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd, struct got_object *obj)
220 struct got_imsg_object iobj, *iobjp = NULL;
221 size_t iobj_size = 0;
222 int imsg_code = GOT_IMSG_OBJECT_REQUEST;
226 case GOT_OBJ_TYPE_TREE:
227 imsg_code = GOT_IMSG_TREE_REQUEST;
229 case GOT_OBJ_TYPE_COMMIT:
230 imsg_code = GOT_IMSG_COMMIT_REQUEST;
232 case GOT_OBJ_TYPE_BLOB:
233 imsg_code = GOT_IMSG_BLOB_REQUEST;
236 return got_error(GOT_ERR_OBJ_TYPE);
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;
250 iobj_size = sizeof(iobj);
253 if (imsg_compose(ibuf, imsg_code, 0, 0, fd, iobjp, iobj_size) == -1)
254 return got_error_from_errno();
256 return flush_imsg(ibuf);
259 const struct got_error *
260 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd)
262 if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, NULL, 0)
264 return got_error_from_errno();
266 return flush_imsg(ibuf);
269 const struct got_error *
270 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
272 if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
274 return got_error_from_errno();
276 return flush_imsg(ibuf);
279 const struct got_error *
280 got_privsep_send_tmpfd(struct imsgbuf *ibuf, int fd)
282 if (imsg_compose(ibuf, GOT_IMSG_TMPFD, 0, 0, fd, NULL, 0)
284 return got_error_from_errno();
286 return flush_imsg(ibuf);
289 const struct got_error *
290 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
292 struct got_imsg_object iobj;
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;
304 if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
306 return got_error_from_errno();
308 return flush_imsg(ibuf);
311 const struct got_error *
312 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
313 struct imsgbuf *ibuf)
315 const struct got_error *err = NULL;
316 struct got_imsg_object iobj;
317 size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
319 if (datalen != sizeof(iobj))
320 return got_error(GOT_ERR_PRIVSEP_LEN);
322 memcpy(&iobj, imsg->data, sizeof(iobj));
324 *obj = calloc(1, sizeof(**obj));
326 return got_error_from_errno();
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;
342 const struct got_error *
343 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
345 const struct got_error *err = NULL;
348 const size_t min_datalen =
349 MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
353 err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
357 datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
359 switch (imsg.hdr.type) {
361 err = recv_imsg_error(&imsg, datalen);
363 case GOT_IMSG_OBJECT:
364 err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
367 err = got_error(GOT_ERR_PRIVSEP_MSG);
376 static const struct got_error *
377 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
380 const struct got_error *err = NULL;
381 size_t offset, remain;
386 size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
388 if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
389 commit->logmsg + offset, n) == -1) {
390 err = got_error_from_errno();
394 err = flush_imsg(ibuf);
405 const struct got_error *
406 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
408 const struct got_error *err = NULL;
409 struct got_imsg_commit_object icommit;
412 struct got_object_qid *qid;
413 size_t logmsg_len = strlen(commit->logmsg);
415 memcpy(icommit.tree_id, commit->tree_id->sha1, sizeof(icommit.tree_id));
416 icommit.author_len = strlen(commit->author);
417 icommit.author_time = commit->author_time;
418 icommit.author_gmtoff = commit->author_gmtoff;
419 icommit.committer_len = strlen(commit->committer);
420 icommit.committer_time = commit->committer_time;
421 icommit.committer_gmtoff = commit->committer_gmtoff;
422 icommit.logmsg_len = logmsg_len;
423 icommit.nparents = commit->nparents;
425 total = sizeof(icommit) + icommit.author_len +
426 icommit.committer_len + icommit.nparents * SHA1_DIGEST_LENGTH;
430 return got_error_from_errno();
433 memcpy(buf + len, &icommit, sizeof(icommit));
434 len += sizeof(icommit);
435 memcpy(buf + len, commit->author, icommit.author_len);
436 len += icommit.author_len;
437 memcpy(buf + len, commit->committer, icommit.committer_len);
438 len += icommit.committer_len;
439 SIMPLEQ_FOREACH(qid, &commit->parent_ids, entry) {
440 memcpy(buf + len, qid->id, SHA1_DIGEST_LENGTH);
441 len += SHA1_DIGEST_LENGTH;
444 if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
445 err = got_error_from_errno();
449 if (logmsg_len == 0 ||
450 logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
451 err = flush_imsg(ibuf);
455 err = send_commit_logmsg(ibuf, commit, logmsg_len);
461 const struct got_error *
462 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
464 const struct got_error *err = NULL;
466 struct got_imsg_commit_object icommit;
469 const size_t min_datalen =
470 MIN(sizeof(struct got_imsg_error),
471 sizeof(struct got_imsg_commit_object));
476 err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
481 datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
484 switch (imsg.hdr.type) {
486 err = recv_imsg_error(&imsg, datalen);
488 case GOT_IMSG_COMMIT:
489 if (datalen < sizeof(icommit)) {
490 err = got_error(GOT_ERR_PRIVSEP_LEN);
494 memcpy(&icommit, data, sizeof(icommit));
495 if (datalen != sizeof(icommit) + icommit.author_len +
496 icommit.committer_len +
497 icommit.nparents * SHA1_DIGEST_LENGTH) {
498 err = got_error(GOT_ERR_PRIVSEP_LEN);
501 if (icommit.nparents < 0) {
502 err = got_error(GOT_ERR_PRIVSEP_LEN);
505 len += sizeof(icommit);
507 *commit = got_object_commit_alloc_partial();
508 if (*commit == NULL) {
509 err = got_error_from_errno();
513 memcpy((*commit)->tree_id->sha1, icommit.tree_id,
515 (*commit)->author_time = icommit.author_time;
516 (*commit)->author_gmtoff = icommit.author_gmtoff;
517 (*commit)->committer_time = icommit.committer_time;
518 (*commit)->committer_gmtoff = icommit.committer_gmtoff;
520 if (icommit.author_len == 0) {
521 (*commit)->author = strdup("");
522 if ((*commit)->author == NULL) {
523 err = got_error_from_errno();
527 (*commit)->author = malloc(icommit.author_len + 1);
528 if ((*commit)->author == NULL) {
529 err = got_error_from_errno();
532 memcpy((*commit)->author, data + len,
534 (*commit)->author[icommit.author_len] = '\0';
536 len += icommit.author_len;
538 if (icommit.committer_len == 0) {
539 (*commit)->committer = strdup("");
540 if ((*commit)->committer == NULL) {
541 err = got_error_from_errno();
545 (*commit)->committer =
546 malloc(icommit.committer_len + 1);
547 if ((*commit)->committer == NULL) {
548 err = got_error_from_errno();
551 memcpy((*commit)->committer, data + len,
552 icommit.committer_len);
553 (*commit)->committer[icommit.committer_len] = '\0';
555 len += icommit.committer_len;
557 if (icommit.logmsg_len == 0) {
558 (*commit)->logmsg = strdup("");
559 if ((*commit)->logmsg == NULL) {
560 err = got_error_from_errno();
564 size_t offset = 0, remain = icommit.logmsg_len;
566 (*commit)->logmsg = malloc(icommit.logmsg_len + 1);
567 if ((*commit)->logmsg == NULL) {
568 err = got_error_from_errno();
572 struct imsg imsg_log;
573 size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
576 err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
580 if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG)
581 return got_error(GOT_ERR_PRIVSEP_MSG);
583 memcpy((*commit)->logmsg + offset,
585 imsg_free(&imsg_log);
589 (*commit)->logmsg[icommit.logmsg_len] = '\0';
592 for (i = 0; i < icommit.nparents; i++) {
593 struct got_object_qid *qid;
595 err = got_object_qid_alloc_partial(&qid);
598 memcpy(qid->id, data + len + i * SHA1_DIGEST_LENGTH,
600 SIMPLEQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
601 (*commit)->nparents++;
605 err = got_error(GOT_ERR_PRIVSEP_MSG);
614 const struct got_error *
615 got_privsep_send_tree(struct imsgbuf *ibuf, struct got_tree_object *tree)
617 const struct got_error *err = NULL;
618 struct got_imsg_tree_object itree;
619 struct got_tree_entry *te;
621 int nimsg; /* number of imsg queued in ibuf */
623 itree.nentries = tree->entries.nentries;
624 if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
626 return got_error_from_errno();
628 totlen = sizeof(itree);
630 SIMPLEQ_FOREACH(te, &tree->entries.head, entry) {
631 struct got_imsg_tree_entry ite;
633 size_t len = sizeof(ite) + strlen(te->name);
635 if (len > MAX_IMSGSIZE)
636 return got_error(GOT_ERR_NO_SPACE);
639 if (totlen + len >= MAX_IMSGSIZE - (IMSG_HEADER_SIZE * nimsg)) {
640 err = flush_imsg(ibuf);
648 return got_error_from_errno();
650 memcpy(ite.id, te->id->sha1, sizeof(ite.id));
652 memcpy(buf, &ite, sizeof(ite));
653 memcpy(buf + sizeof(ite), te->name, strlen(te->name));
655 if (imsg_compose(ibuf, GOT_IMSG_TREE_ENTRY, 0, 0, -1,
657 err = got_error_from_errno();
664 return flush_imsg(ibuf);
667 const struct got_error *
668 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
670 const struct got_error *err = NULL;
671 const size_t min_datalen =
672 MIN(sizeof(struct got_imsg_error),
673 sizeof(struct got_imsg_tree_object));
674 struct got_imsg_tree_object itree = { 0 };
679 err = read_imsg(ibuf);
687 struct got_imsg_tree_entry ite;
688 struct got_tree_entry *te = NULL;
690 n = imsg_get(ibuf, &imsg);
692 if (*tree && (*tree)->entries.nentries != nentries)
697 if (imsg.hdr.len < IMSG_HEADER_SIZE + min_datalen)
698 return got_error(GOT_ERR_PRIVSEP_LEN);
700 datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
702 switch (imsg.hdr.type) {
704 err = recv_imsg_error(&imsg, datalen);
707 /* This message should only appear once. */
709 err = got_error(GOT_ERR_PRIVSEP_MSG);
712 if (datalen != sizeof(itree)) {
713 err = got_error(GOT_ERR_PRIVSEP_LEN);
716 memcpy(&itree, imsg.data, sizeof(itree));
717 *tree = calloc(1, sizeof(**tree));
719 err = got_error_from_errno();
722 (*tree)->entries.nentries = itree.nentries;
723 SIMPLEQ_INIT(&(*tree)->entries.head);
725 case GOT_IMSG_TREE_ENTRY:
726 /* This message should be preceeded by GOT_IMSG_TREE. */
728 err = got_error(GOT_ERR_PRIVSEP_MSG);
731 if (datalen < sizeof(ite) || datalen > MAX_IMSGSIZE) {
732 err = got_error(GOT_ERR_PRIVSEP_LEN);
736 /* Remaining data contains the entry's name. */
737 datalen -= sizeof(ite);
738 memcpy(&ite, imsg.data, sizeof(ite));
739 if (datalen == 0 || datalen > MAX_IMSGSIZE) {
740 err = got_error(GOT_ERR_PRIVSEP_LEN);
744 te = got_alloc_tree_entry_partial();
746 err = got_error_from_errno();
749 te->name = malloc(datalen + 1);
750 if (te->name == NULL) {
752 err = got_error_from_errno();
755 memcpy(te->name, imsg.data + sizeof(ite), datalen);
756 te->name[datalen] = '\0';
758 memcpy(te->id->sha1, ite.id, SHA1_DIGEST_LENGTH);
760 SIMPLEQ_INSERT_TAIL(&(*tree)->entries.head, te, entry);
764 err = got_error(GOT_ERR_PRIVSEP_MSG);
771 if (*tree && (*tree)->entries.nentries != nentries) {
773 err = got_error(GOT_ERR_PRIVSEP_LEN);
774 got_object_tree_close(*tree);
781 const struct got_error *
782 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size)
784 struct got_imsg_blob iblob;
787 /* Data has already been written to file descriptor. */
789 if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob, sizeof(iblob))
791 return got_error_from_errno();
793 return flush_imsg(ibuf);
796 const struct got_error *
797 got_privsep_recv_blob(size_t *size, struct imsgbuf *ibuf)
799 const struct got_error *err = NULL;
801 struct got_imsg_blob iblob;
804 err = got_privsep_recv_imsg(&imsg, ibuf, 0);
808 datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
810 switch (imsg.hdr.type) {
812 err = recv_imsg_error(&imsg, datalen);
815 if (datalen != sizeof(iblob)) {
816 err = got_error(GOT_ERR_PRIVSEP_LEN);
819 memcpy(&iblob, imsg.data, sizeof(iblob));
821 /* Data has been written to file descriptor. */
824 err = got_error(GOT_ERR_PRIVSEP_MSG);
833 const struct got_error *
834 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
835 struct got_packidx *packidx)
837 struct got_imsg_packidx ipackidx;
838 struct got_imsg_pack ipack;
841 ipackidx.len = packidx->len;
842 fd = dup(packidx->fd);
844 return got_error_from_errno();
846 if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
847 sizeof(ipackidx)) == -1)
848 return got_error_from_errno();
850 if (strlcpy(ipack.path_packfile, pack->path_packfile,
851 sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
852 return got_error(GOT_ERR_NO_SPACE);
853 ipack.filesize = pack->filesize;
857 return got_error_from_errno();
859 if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
861 return got_error_from_errno();
863 return flush_imsg(ibuf);
866 const struct got_error *
867 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
868 struct got_object_id *id)
870 struct got_imsg_packed_object iobj;
873 memcpy(iobj.id, id->sha1, sizeof(iobj.id));
875 if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
876 &iobj, sizeof(iobj)) == -1)
877 return got_error_from_errno();
879 return flush_imsg(ibuf);