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>
32 #include "got_object.h"
33 #include "got_error.h"
35 #include "got_lib_sha1.h"
36 #include "got_lib_delta.h"
37 #include "got_lib_inflate.h"
38 #include "got_lib_object.h"
39 #include "got_lib_object_parse.h"
40 #include "got_lib_privsep.h"
43 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
46 static const struct got_error *
47 poll_fd(int fd, int events, int timeout)
53 pfd[0].events = events;
55 n = poll(pfd, 1, timeout);
57 return got_error_from_errno();
59 return got_error(GOT_ERR_TIMEOUT);
60 if (pfd[0].revents & (POLLERR | POLLNVAL))
61 return got_error_from_errno();
62 if (pfd[0].revents & (events | POLLHUP))
65 return got_error(GOT_ERR_INTERRUPT);
68 static const struct got_error *
69 read_imsg(struct imsgbuf *ibuf)
71 const struct got_error *err;
74 err = poll_fd(ibuf->fd, POLLIN, INFTIM);
80 if (errno == EAGAIN) /* Could be a file-descriptor leak. */
81 return got_error(GOT_ERR_PRIVSEP_NO_FD);
82 return got_error(GOT_ERR_PRIVSEP_READ);
85 return got_error(GOT_ERR_PRIVSEP_PIPE);
90 const struct got_error *
91 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf, size_t min_datalen)
93 const struct got_error *err;
96 err = read_imsg(ibuf);
100 n = imsg_get(ibuf, imsg);
102 return got_error(GOT_ERR_PRIVSEP_READ);
104 if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
105 return got_error(GOT_ERR_PRIVSEP_LEN);
110 static const struct got_error *
111 recv_imsg_error(struct imsg *imsg, size_t datalen)
113 struct got_imsg_error ierr;
115 if (datalen != sizeof(ierr))
116 return got_error(GOT_ERR_PRIVSEP_LEN);
118 memcpy(&ierr, imsg->data, sizeof(ierr));
119 if (ierr.code == GOT_ERR_ERRNO) {
120 static struct got_error serr;
121 serr.code = GOT_ERR_ERRNO;
122 serr.msg = strerror(ierr.errno_code);
126 return got_error(ierr.code);
129 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
131 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
133 const struct got_error *poll_err;
134 struct got_imsg_error ierr;
137 ierr.code = err->code;
138 if (err->code == GOT_ERR_ERRNO)
139 ierr.errno_code = errno;
142 ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
144 fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
145 getprogname(), err->code, err->msg, strerror(errno));
149 poll_err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
151 fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
152 getprogname(), err->code, err->msg, poll_err->msg);
156 ret = imsg_flush(ibuf);
158 fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
159 getprogname(), err->code, err->msg, strerror(errno));
164 static const struct got_error *
165 flush_imsg(struct imsgbuf *ibuf)
167 const struct got_error *err;
169 err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
173 if (imsg_flush(ibuf) == -1)
174 return got_error_from_errno();
179 const struct got_error *
180 got_privsep_send_stop(int fd)
182 const struct got_error *err = NULL;
185 imsg_init(&ibuf, fd);
187 if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
188 return got_error_from_errno();
190 err = flush_imsg(&ibuf);
195 const struct got_error *
196 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd, struct got_object *obj)
198 struct got_imsg_object iobj, *iobjp = NULL;
199 size_t iobj_size = 0;
200 int imsg_code = GOT_IMSG_OBJECT_REQUEST;
204 case GOT_OBJ_TYPE_TREE:
205 imsg_code = GOT_IMSG_TREE_REQUEST;
207 case GOT_OBJ_TYPE_COMMIT:
208 imsg_code = GOT_IMSG_COMMIT_REQUEST;
211 return got_error(GOT_ERR_OBJ_TYPE);
214 iobj.type = obj->type;
215 iobj.flags = obj->flags;
216 iobj.hdrlen = obj->hdrlen;
217 iobj.size = obj->size;
221 iobj_size = sizeof(iobj);
224 if (imsg_compose(ibuf, imsg_code, 0, 0, fd, iobjp, iobj_size) == -1)
225 return got_error_from_errno();
227 return flush_imsg(ibuf);
230 const struct got_error *
231 got_privsep_send_blob_req(struct imsgbuf *ibuf, int outfd, int infd)
233 const struct got_error *err = NULL;
235 if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, NULL, 0)
239 return got_error_from_errno();
242 err = flush_imsg(ibuf);
248 if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
251 return got_error_from_errno();
254 return flush_imsg(ibuf);
257 const struct got_error *
258 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj, int ndeltas)
260 struct got_imsg_object iobj;
262 iobj.type = obj->type;
263 iobj.flags = obj->flags;
264 iobj.hdrlen = obj->hdrlen;
265 iobj.size = obj->size;
266 iobj.ndeltas = ndeltas;
269 /* TODO: Handle deltas */
272 if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
274 return got_error_from_errno();
276 return flush_imsg(ibuf);
279 const struct got_error *
280 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
282 const struct got_error *err = NULL;
284 struct got_imsg_object iobj;
287 const size_t min_datalen =
288 MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
292 err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
296 datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
298 switch (imsg.hdr.type) {
300 err = recv_imsg_error(&imsg, datalen);
302 case GOT_IMSG_OBJECT:
303 if (datalen != sizeof(iobj)) {
304 err = got_error(GOT_ERR_PRIVSEP_LEN);
308 memcpy(&iobj, imsg.data, sizeof(iobj));
309 if (iobj.ndeltas < 0 ||
310 iobj.ndeltas > GOT_DELTA_CHAIN_RECURSION_MAX) {
311 err = got_error(GOT_ERR_PRIVSEP_LEN);
315 *obj = calloc(1, sizeof(**obj));
317 err = got_error_from_errno();
321 (*obj)->type = iobj.type;
322 (*obj)->hdrlen = iobj.hdrlen;
323 (*obj)->size = iobj.size;
324 for (i = 0; i < iobj.ndeltas; i++) {
325 /* TODO: Handle deltas */
329 err = got_error(GOT_ERR_PRIVSEP_MSG);
338 const struct got_error *
339 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
341 const struct got_error *err = NULL;
342 struct got_imsg_commit_object icommit;
345 struct got_object_qid *qid;
347 memcpy(icommit.tree_id, commit->tree_id->sha1, sizeof(icommit.tree_id));
348 icommit.author_len = strlen(commit->author);
349 memcpy(&icommit.tm_author, &commit->tm_author,
350 sizeof(icommit.tm_author));
351 icommit.committer_len = strlen(commit->committer);
352 memcpy(&icommit.tm_committer, &commit->tm_committer,
353 sizeof(icommit.tm_committer));
354 icommit.logmsg_len = strlen(commit->logmsg);
355 icommit.nparents = commit->nparents;
357 total = sizeof(icommit) + icommit.author_len +
358 icommit.committer_len + icommit.logmsg_len +
359 icommit.nparents * SHA1_DIGEST_LENGTH;
360 /* XXX TODO support very large log messages properly */
361 if (total > MAX_IMSGSIZE)
362 return got_error(GOT_ERR_NO_SPACE);
366 return got_error_from_errno();
369 memcpy(buf + len, &icommit, sizeof(icommit));
370 len += sizeof(icommit);
371 memcpy(buf + len, commit->author, icommit.author_len);
372 len += icommit.author_len;
373 memcpy(buf + len, commit->committer, icommit.committer_len);
374 len += icommit.committer_len;
375 memcpy(buf + len, commit->logmsg, icommit.logmsg_len);
376 len += icommit.logmsg_len;
377 SIMPLEQ_FOREACH(qid, &commit->parent_ids, entry) {
378 memcpy(buf + len, qid->id, SHA1_DIGEST_LENGTH);
379 len += SHA1_DIGEST_LENGTH;
382 if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
383 err = got_error_from_errno();
387 err = flush_imsg(ibuf);
392 const struct got_error *
393 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
395 const struct got_error *err = NULL;
397 struct got_imsg_commit_object icommit;
400 const size_t min_datalen =
401 MIN(sizeof(struct got_imsg_error),
402 sizeof(struct got_imsg_commit_object));
407 err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
412 datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
415 switch (imsg.hdr.type) {
417 err = recv_imsg_error(&imsg, datalen);
419 case GOT_IMSG_COMMIT:
420 if (datalen < sizeof(icommit)) {
421 err = got_error(GOT_ERR_PRIVSEP_LEN);
425 memcpy(&icommit, data, sizeof(icommit));
426 if (datalen != sizeof(icommit) + icommit.author_len +
427 icommit.committer_len + icommit.logmsg_len +
428 icommit.nparents * SHA1_DIGEST_LENGTH) {
429 err = got_error(GOT_ERR_PRIVSEP_LEN);
432 if (icommit.nparents < 0) {
433 err = got_error(GOT_ERR_PRIVSEP_LEN);
436 len += sizeof(icommit);
438 *commit = got_object_commit_alloc_partial();
439 if (*commit == NULL) {
440 err = got_error_from_errno();
444 memcpy((*commit)->tree_id->sha1, icommit.tree_id,
446 memcpy(&(*commit)->tm_author, &icommit.tm_author,
447 sizeof((*commit)->tm_author));
448 memcpy(&(*commit)->tm_committer, &icommit.tm_committer,
449 sizeof((*commit)->tm_committer));
451 if (icommit.author_len == 0) {
452 (*commit)->author = strdup("");
453 if ((*commit)->author == NULL) {
454 err = got_error_from_errno();
458 (*commit)->author = malloc(icommit.author_len + 1);
459 if ((*commit)->author == NULL) {
460 err = got_error_from_errno();
463 memcpy((*commit)->author, data + len,
465 (*commit)->author[icommit.author_len] = '\0';
467 len += icommit.author_len;
469 if (icommit.committer_len == 0) {
470 (*commit)->committer = strdup("");
471 if ((*commit)->committer == NULL) {
472 err = got_error_from_errno();
476 (*commit)->committer =
477 malloc(icommit.committer_len + 1);
478 if ((*commit)->committer == NULL) {
479 err = got_error_from_errno();
482 memcpy((*commit)->committer, data + len,
483 icommit.committer_len);
484 (*commit)->committer[icommit.committer_len] = '\0';
486 len += icommit.committer_len;
488 if (icommit.logmsg_len == 0) {
489 (*commit)->logmsg = strdup("");
490 if ((*commit)->logmsg == NULL) {
491 err = got_error_from_errno();
495 (*commit)->logmsg = malloc(icommit.logmsg_len + 1);
496 if ((*commit)->logmsg == NULL) {
497 err = got_error_from_errno();
500 memcpy((*commit)->logmsg, data + len,
502 (*commit)->logmsg[icommit.logmsg_len] = '\0';
504 len += icommit.logmsg_len;
506 for (i = 0; i < icommit.nparents; i++) {
507 struct got_object_qid *qid;
509 qid = calloc(1, sizeof(*qid));
511 err = got_error_from_errno();
514 qid->id = calloc(1, sizeof(*qid->id));
515 if (qid->id == NULL) {
516 err = got_error_from_errno();
521 memcpy(qid->id, data + len + i * SHA1_DIGEST_LENGTH,
523 SIMPLEQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
524 (*commit)->nparents++;
528 err = got_error(GOT_ERR_PRIVSEP_MSG);
537 const struct got_error *
538 got_privsep_send_tree(struct imsgbuf *ibuf, struct got_tree_object *tree)
540 const struct got_error *err = NULL;
541 struct got_imsg_tree_object itree;
542 struct got_tree_entry *te;
544 itree.nentries = tree->entries.nentries;
545 if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
547 return got_error_from_errno();
549 err = flush_imsg(ibuf);
553 SIMPLEQ_FOREACH(te, &tree->entries.head, entry) {
554 struct got_imsg_tree_entry ite;
556 size_t len = sizeof(ite) + strlen(te->name);
558 if (len > MAX_IMSGSIZE)
559 return got_error(GOT_ERR_NO_SPACE);
563 return got_error_from_errno();
565 memcpy(ite.id, te->id->sha1, sizeof(ite.id));
567 memcpy(buf, &ite, sizeof(ite));
568 memcpy(buf + sizeof(ite), te->name, strlen(te->name));
570 if (imsg_compose(ibuf, GOT_IMSG_TREE_ENTRY, 0, 0, -1,
572 err = got_error_from_errno();
577 err = flush_imsg(ibuf);
585 const struct got_error *
586 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
588 const struct got_error *err = NULL;
589 const size_t min_datalen =
590 MIN(sizeof(struct got_imsg_error),
591 sizeof(struct got_imsg_tree_object));
592 struct got_imsg_tree_object itree = { 0 };
597 err = read_imsg(ibuf);
605 struct got_imsg_tree_entry ite;
606 struct got_tree_entry *te = NULL;
608 n = imsg_get(ibuf, &imsg);
610 if (*tree && (*tree)->entries.nentries != nentries)
615 if (imsg.hdr.len < IMSG_HEADER_SIZE + min_datalen)
616 return got_error(GOT_ERR_PRIVSEP_LEN);
618 datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
620 switch (imsg.hdr.type) {
622 err = recv_imsg_error(&imsg, datalen);
625 /* This message should only appear once. */
627 err = got_error(GOT_ERR_PRIVSEP_MSG);
630 if (datalen != sizeof(itree)) {
631 err = got_error(GOT_ERR_PRIVSEP_LEN);
634 memcpy(&itree, imsg.data, sizeof(itree));
635 *tree = calloc(1, sizeof(**tree));
637 err = got_error_from_errno();
640 (*tree)->entries.nentries = itree.nentries;
641 SIMPLEQ_INIT(&(*tree)->entries.head);
643 case GOT_IMSG_TREE_ENTRY:
644 /* This message should be preceeded by GOT_IMSG_TREE. */
646 err = got_error(GOT_ERR_PRIVSEP_MSG);
649 if (datalen < sizeof(ite) || datalen > MAX_IMSGSIZE) {
650 err = got_error(GOT_ERR_PRIVSEP_LEN);
654 /* Remaining data contains the entry's name. */
655 datalen -= sizeof(ite);
656 memcpy(&ite, imsg.data, sizeof(ite));
657 if (datalen == 0 || datalen > MAX_IMSGSIZE) {
658 err = got_error(GOT_ERR_PRIVSEP_LEN);
662 te = got_alloc_tree_entry_partial();
664 err = got_error_from_errno();
667 te->name = malloc(datalen + 1);
668 if (te->name == NULL) {
670 err = got_error_from_errno();
673 memcpy(te->name, imsg.data + sizeof(ite), datalen);
674 te->name[datalen] = '\0';
676 memcpy(te->id->sha1, ite.id, SHA1_DIGEST_LENGTH);
678 SIMPLEQ_INSERT_TAIL(&(*tree)->entries.head, te, entry);
682 err = got_error(GOT_ERR_PRIVSEP_MSG);
689 if (*tree && (*tree)->entries.nentries != nentries) {
691 err = got_error(GOT_ERR_PRIVSEP_LEN);
692 got_object_tree_close(*tree);
699 const struct got_error *
700 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size)
702 struct got_imsg_blob iblob;
705 /* Data has already been written to file descriptor. */
707 if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob, sizeof(iblob))
709 return got_error_from_errno();
711 return flush_imsg(ibuf);
714 const struct got_error *
715 got_privsep_recv_blob(size_t *size, struct imsgbuf *ibuf)
717 const struct got_error *err = NULL;
719 struct got_imsg_blob iblob;
722 err = got_privsep_recv_imsg(&imsg, ibuf, 0);
726 datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
728 switch (imsg.hdr.type) {
730 err = recv_imsg_error(&imsg, datalen);
733 if (datalen != sizeof(iblob))
734 err = got_error(GOT_ERR_PRIVSEP_LEN);
735 memcpy(&iblob, imsg.data, sizeof(iblob));
737 /* Data has been written to file descriptor. */
740 err = got_error(GOT_ERR_PRIVSEP_MSG);