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 size_t offset, remain;
385 size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
387 if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
388 commit->logmsg + offset, n) == -1)
389 return got_error_from_errno();
391 if (imsg_flush(ibuf) == -1)
392 return got_error_from_errno();
401 const struct got_error *
402 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
404 const struct got_error *err = NULL;
405 struct got_imsg_commit_object icommit;
408 struct got_object_qid *qid;
409 size_t logmsg_len = strlen(commit->logmsg);
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;
421 total = sizeof(icommit) + icommit.author_len +
422 icommit.committer_len + icommit.nparents * SHA1_DIGEST_LENGTH;
426 return got_error_from_errno();
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;
440 if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
441 err = got_error_from_errno();
445 err = flush_imsg(ibuf);
449 err = send_commit_logmsg(ibuf, commit, logmsg_len);
455 const struct got_error *
456 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
458 const struct got_error *err = NULL;
460 struct got_imsg_commit_object icommit;
463 const size_t min_datalen =
464 MIN(sizeof(struct got_imsg_error),
465 sizeof(struct got_imsg_commit_object));
470 err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
475 datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
478 switch (imsg.hdr.type) {
480 err = recv_imsg_error(&imsg, datalen);
482 case GOT_IMSG_COMMIT:
483 if (datalen < sizeof(icommit)) {
484 err = got_error(GOT_ERR_PRIVSEP_LEN);
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);
495 if (icommit.nparents < 0) {
496 err = got_error(GOT_ERR_PRIVSEP_LEN);
499 len += sizeof(icommit);
501 *commit = got_object_commit_alloc_partial();
502 if (*commit == NULL) {
503 err = got_error_from_errno();
507 memcpy((*commit)->tree_id->sha1, icommit.tree_id,
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));
514 if (icommit.author_len == 0) {
515 (*commit)->author = strdup("");
516 if ((*commit)->author == NULL) {
517 err = got_error_from_errno();
521 (*commit)->author = malloc(icommit.author_len + 1);
522 if ((*commit)->author == NULL) {
523 err = got_error_from_errno();
526 memcpy((*commit)->author, data + len,
528 (*commit)->author[icommit.author_len] = '\0';
530 len += icommit.author_len;
532 if (icommit.committer_len == 0) {
533 (*commit)->committer = strdup("");
534 if ((*commit)->committer == NULL) {
535 err = got_error_from_errno();
539 (*commit)->committer =
540 malloc(icommit.committer_len + 1);
541 if ((*commit)->committer == NULL) {
542 err = got_error_from_errno();
545 memcpy((*commit)->committer, data + len,
546 icommit.committer_len);
547 (*commit)->committer[icommit.committer_len] = '\0';
549 len += icommit.committer_len;
551 if (icommit.logmsg_len == 0) {
552 (*commit)->logmsg = strdup("");
553 if ((*commit)->logmsg == NULL) {
554 err = got_error_from_errno();
558 size_t offset = 0, remain = icommit.logmsg_len;
560 (*commit)->logmsg = malloc(icommit.logmsg_len + 1);
561 if ((*commit)->logmsg == NULL) {
562 err = got_error_from_errno();
566 struct imsg imsg_log;
567 size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
570 err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
574 if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG)
575 return got_error(GOT_ERR_PRIVSEP_MSG);
577 memcpy((*commit)->logmsg + offset,
579 imsg_free(&imsg_log);
583 (*commit)->logmsg[icommit.logmsg_len] = '\0';
586 for (i = 0; i < icommit.nparents; i++) {
587 struct got_object_qid *qid;
589 qid = calloc(1, sizeof(*qid));
591 err = got_error_from_errno();
594 qid->id = calloc(1, sizeof(*qid->id));
595 if (qid->id == NULL) {
596 err = got_error_from_errno();
601 memcpy(qid->id, data + len + i * SHA1_DIGEST_LENGTH,
603 SIMPLEQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
604 (*commit)->nparents++;
608 err = got_error(GOT_ERR_PRIVSEP_MSG);
617 const struct got_error *
618 got_privsep_send_tree(struct imsgbuf *ibuf, struct got_tree_object *tree)
620 const struct got_error *err = NULL;
621 struct got_imsg_tree_object itree;
622 struct got_tree_entry *te;
624 itree.nentries = tree->entries.nentries;
625 if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
627 return got_error_from_errno();
629 err = flush_imsg(ibuf);
633 SIMPLEQ_FOREACH(te, &tree->entries.head, entry) {
634 struct got_imsg_tree_entry ite;
636 size_t len = sizeof(ite) + strlen(te->name);
638 if (len > MAX_IMSGSIZE)
639 return got_error(GOT_ERR_NO_SPACE);
643 return got_error_from_errno();
645 memcpy(ite.id, te->id->sha1, sizeof(ite.id));
647 memcpy(buf, &ite, sizeof(ite));
648 memcpy(buf + sizeof(ite), te->name, strlen(te->name));
650 if (imsg_compose(ibuf, GOT_IMSG_TREE_ENTRY, 0, 0, -1,
652 err = got_error_from_errno();
657 err = flush_imsg(ibuf);
665 const struct got_error *
666 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
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 };
677 err = read_imsg(ibuf);
685 struct got_imsg_tree_entry ite;
686 struct got_tree_entry *te = NULL;
688 n = imsg_get(ibuf, &imsg);
690 if (*tree && (*tree)->entries.nentries != nentries)
695 if (imsg.hdr.len < IMSG_HEADER_SIZE + min_datalen)
696 return got_error(GOT_ERR_PRIVSEP_LEN);
698 datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
700 switch (imsg.hdr.type) {
702 err = recv_imsg_error(&imsg, datalen);
705 /* This message should only appear once. */
707 err = got_error(GOT_ERR_PRIVSEP_MSG);
710 if (datalen != sizeof(itree)) {
711 err = got_error(GOT_ERR_PRIVSEP_LEN);
714 memcpy(&itree, imsg.data, sizeof(itree));
715 *tree = calloc(1, sizeof(**tree));
717 err = got_error_from_errno();
720 (*tree)->entries.nentries = itree.nentries;
721 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 memcpy(&ite, imsg.data, sizeof(ite));
737 if (datalen == 0 || datalen > MAX_IMSGSIZE) {
738 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);
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 err = recv_imsg_error(&imsg, datalen);
813 if (datalen != sizeof(iblob))
814 err = got_error(GOT_ERR_PRIVSEP_LEN);
815 memcpy(&iblob, imsg.data, sizeof(iblob));
817 /* Data has been written to file descriptor. */
820 err = got_error(GOT_ERR_PRIVSEP_MSG);
829 const struct got_error *
830 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
831 struct got_packidx *packidx)
833 struct got_imsg_packidx ipackidx;
834 struct got_imsg_pack ipack;
837 ipackidx.len = packidx->len;
838 fd = dup(packidx->fd);
840 return got_error_from_errno();
842 if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
843 sizeof(ipackidx)) == -1)
844 return got_error_from_errno();
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;
853 return got_error_from_errno();
855 if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
857 return got_error_from_errno();
859 return flush_imsg(ibuf);
862 const struct got_error *
863 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx)
865 struct got_imsg_packed_object iobj;
869 if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
870 &iobj, sizeof(iobj)) == -1)
871 return got_error_from_errno();
873 return flush_imsg(ibuf);