1 /*
2  * Copyright (c) 2018, 2019 Stefan Sperling <stsp@openbsd.org>
3  * Copyright (c) 2019, Ori Bernstein <ori@openbsd.org>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 /*
19  * All code runs under the same UID but sensitive code paths are
20  * run in a separate process with tighter pledge(2) promises.
21  * Data is communicated between processes via imsg_flush(3) and imsg_read(3).
22  * This behaviour is transparent to users of the library.
23  *
24  * We generally transmit data in imsg buffers, split across several messages
25  * if necessary. File descriptors are used in cases where this is impractical,
26  * such as when accessing pack files or when transferring large blobs.
27  *
28  * We exec(2) after a fork(2). Parts of our library functionality are
29  * accessible via separate executables in a libexec directory.
30  */
31 
32 #define GOT_IMSG_FD_CHILD (STDERR_FILENO + 1)
33 
34 #ifndef GOT_LIBEXECDIR
35 #define GOT_LIBEXECDIR /usr/libexec
36 #endif
37 
38 /* Names of helper programs in libexec directory */
39 #define GOT_PROG_READ_OBJECT	got-read-object
40 #define GOT_PROG_READ_TREE	got-read-tree
41 #define GOT_PROG_READ_COMMIT	got-read-commit
42 #define GOT_PROG_READ_BLOB	got-read-blob
43 #define GOT_PROG_READ_TAG	got-read-tag
44 #define GOT_PROG_READ_PACK	got-read-pack
45 #define GOT_PROG_READ_GITCONFIG	got-read-gitconfig
46 #define GOT_PROG_READ_GOTCONFIG	got-read-gotconfig
47 #define GOT_PROG_FETCH_PACK	got-fetch-pack
48 #define GOT_PROG_INDEX_PACK	got-index-pack
49 #define GOT_PROG_SEND_PACK	got-send-pack
50 
51 #define GOT_STRINGIFY(x) #x
52 #define GOT_STRINGVAL(x) GOT_STRINGIFY(x)
53 
54 /* Paths to helper programs in libexec directory */
55 #define GOT_PATH_PROG_READ_OBJECT \
56 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_OBJECT)
57 #define GOT_PATH_PROG_READ_TREE \
58 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_TREE)
59 #define GOT_PATH_PROG_READ_COMMIT \
60 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_COMMIT)
61 #define GOT_PATH_PROG_READ_BLOB \
62 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_BLOB)
63 #define GOT_PATH_PROG_READ_TAG \
64 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_TAG)
65 #define GOT_PATH_PROG_READ_PACK \
66 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_PACK)
67 #define GOT_PATH_PROG_READ_GITCONFIG \
68 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_GITCONFIG)
69 #define GOT_PATH_PROG_READ_GOTCONFIG \
70 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_GOTCONFIG)
71 #define GOT_PATH_PROG_FETCH_PACK \
72 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_FETCH_PACK)
73 #define GOT_PATH_PROG_SEND_PACK \
74 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_SEND_PACK)
75 #define GOT_PATH_PROG_INDEX_PACK \
76 	GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_INDEX_PACK)
77 
78 struct got_privsep_child {
79 	int imsg_fd;
80 	pid_t pid;
81 	struct imsgbuf *ibuf;
82 };
83 
84 enum got_imsg_type {
85 	/* An error occured while processing a request. */
86 	GOT_IMSG_ERROR,
87 
88 	/* Stop the child process. */
89 	GOT_IMSG_STOP,
90 
91 	/*
92 	 * Messages concerned with read access to objects in a repository.
93 	 * Object and pack files are opened by the main process, where
94 	 * data may be read as a byte string but without any interpretation.
95 	 * Decompression and parsing of object and pack files occurs in a
96 	 * separate process which runs under pledge("stdio recvfd").
97 	 * This sandboxes our own repository parsing code, as well as zlib.
98 	 */
99 	GOT_IMSG_OBJECT_REQUEST,
100 	GOT_IMSG_OBJECT,
101 	GOT_IMSG_COMMIT_REQUEST,
102 	GOT_IMSG_COMMIT,
103 	GOT_IMSG_COMMIT_LOGMSG,
104 	GOT_IMSG_TREE_REQUEST,
105 	GOT_IMSG_TREE,
106 	GOT_IMSG_TREE_ENTRY,
107 	GOT_IMSG_BLOB_REQUEST,
108 	GOT_IMSG_BLOB_OUTFD,
109 	GOT_IMSG_BLOB,
110 	GOT_IMSG_TAG_REQUEST,
111 	GOT_IMSG_TAG,
112 	GOT_IMSG_TAG_TAGMSG,
113 
114 	/* Messages related to networking. */
115 	GOT_IMSG_FETCH_REQUEST,
116 	GOT_IMSG_FETCH_HAVE_REF,
117 	GOT_IMSG_FETCH_WANTED_BRANCH,
118 	GOT_IMSG_FETCH_WANTED_REF,
119 	GOT_IMSG_FETCH_OUTFD,
120 	GOT_IMSG_FETCH_SYMREFS,
121 	GOT_IMSG_FETCH_REF,
122 	GOT_IMSG_FETCH_SERVER_PROGRESS,
123 	GOT_IMSG_FETCH_DOWNLOAD_PROGRESS,
124 	GOT_IMSG_FETCH_DONE,
125 	GOT_IMSG_IDXPACK_REQUEST,
126 	GOT_IMSG_IDXPACK_OUTFD,
127 	GOT_IMSG_IDXPACK_PROGRESS,
128 	GOT_IMSG_IDXPACK_DONE,
129 
130 	/* Messages related to pack files. */
131 	GOT_IMSG_PACKIDX,
132 	GOT_IMSG_PACK,
133 	GOT_IMSG_PACKED_OBJECT_REQUEST,
134 	GOT_IMSG_COMMIT_TRAVERSAL_REQUEST,
135 	GOT_IMSG_TRAVERSED_COMMITS,
136 	GOT_IMSG_COMMIT_TRAVERSAL_DONE,
137 
138 	/* Message sending file descriptor to a temporary file. */
139 	GOT_IMSG_TMPFD,
140 
141 	/* Messages related to gitconfig files. */
142 	GOT_IMSG_GITCONFIG_PARSE_REQUEST,
143 	GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST,
144 	GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST,
145 	GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST,
146 	GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST,
147 	GOT_IMSG_GITCONFIG_REMOTES_REQUEST,
148 	GOT_IMSG_GITCONFIG_INT_VAL,
149 	GOT_IMSG_GITCONFIG_STR_VAL,
150 	GOT_IMSG_GITCONFIG_REMOTES,
151 	GOT_IMSG_GITCONFIG_REMOTE,
152 	GOT_IMSG_GITCONFIG_OWNER_REQUEST,
153 	GOT_IMSG_GITCONFIG_OWNER,
154 
155 	/* Messages related to gotconfig files. */
156 	GOT_IMSG_GOTCONFIG_PARSE_REQUEST,
157 	GOT_IMSG_GOTCONFIG_AUTHOR_REQUEST,
158 	GOT_IMSG_GOTCONFIG_REMOTES_REQUEST,
159 	GOT_IMSG_GOTCONFIG_INT_VAL,
160 	GOT_IMSG_GOTCONFIG_STR_VAL,
161 	GOT_IMSG_GOTCONFIG_REMOTES,
162 	GOT_IMSG_GOTCONFIG_REMOTE,
163 
164 	/* Raw object access. Uncompress object data but do not parse it. */
165 	GOT_IMSG_RAW_OBJECT_REQUEST,
166 	GOT_IMSG_RAW_OBJECT_OUTFD,
167 	GOT_IMSG_PACKED_RAW_OBJECT_REQUEST,
168 	GOT_IMSG_RAW_OBJECT,
169 };
170 
171 /* Structure for GOT_IMSG_ERROR. */
172 struct got_imsg_error {
173 	int code; /* an error code from got_error.h */
174 	int errno_code; /* in case code equals GOT_ERR_ERRNO */
175 } __attribute__((__packed__));
176 
177 /*
178  * Structure for GOT_IMSG_TREE_REQUEST and GOT_IMSG_OBJECT data.
179  */
180 struct got_imsg_object {
181 	uint8_t id[SHA1_DIGEST_LENGTH];
182 
183 	/* These fields are the same as in struct got_object. */
184 	int type;
185 	int flags;
186 	size_t hdrlen;
187 	size_t size;
188 	off_t pack_offset;
189 	int pack_idx;
190 }  __attribute__((__packed__));
191 
192 /* Structure for GOT_IMSG_COMMIT data. */
193 struct got_imsg_commit_object {
194 	uint8_t tree_id[SHA1_DIGEST_LENGTH];
195 	size_t author_len;
196 	time_t author_time;
197 	time_t author_gmtoff;
198 	size_t committer_len;
199 	time_t committer_time;
200 	time_t committer_gmtoff;
201 	size_t logmsg_len;
202 	int nparents;
203 
204 	/*
205 	 * Followed by author_len + committer_len data bytes
206 	 */
207 
208 	/* Followed by 'nparents' SHA1_DIGEST_LENGTH length strings */
209 
210 	/*
211 	 * Followed by 'logmsg_len' bytes of commit log message data in
212 	 * one or more GOT_IMSG_COMMIT_LOGMSG messages.
213 	 */
214 } __attribute__((__packed__));
215 
216 
217 /* Structure for GOT_IMSG_TREE_ENTRY. */
218 struct got_imsg_tree_entry {
219 	char id[SHA1_DIGEST_LENGTH];
220 	mode_t mode;
221 	/* Followed by entry's name in remaining data of imsg buffer. */
222 } __attribute__((__packed__));
223 
224 /* Structure for GOT_IMSG_TREE_OBJECT_REPLY data. */
225 struct got_imsg_tree_object {
226 	int nentries; /* This many TREE_ENTRY messages follow. */
227 };
228 
229 /* Structure for GOT_IMSG_BLOB. */
230 struct got_imsg_blob {
231 	size_t size;
232 	size_t hdrlen;
233 
234 	/*
235 	 * If size <= GOT_PRIVSEP_INLINE_BLOB_DATA_MAX, blob data follows
236 	 * in the imsg buffer. Otherwise, blob data has been written to a
237 	 * file descriptor passed via the GOT_IMSG_BLOB_OUTFD imsg.
238 	 */
239 #define GOT_PRIVSEP_INLINE_BLOB_DATA_MAX \
240 	(MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof(struct got_imsg_blob))
241 };
242 
243 /* Structure for GOT_IMSG_RAW_OBJECT. */
244 struct got_imsg_raw_obj {
245 	off_t size;
246 	size_t hdrlen;
247 
248 	/*
249 	 * If size <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX, object data follows
250 	 * in the imsg buffer. Otherwise, object data has been written to a
251 	 * file descriptor passed via the GOT_IMSG_RAW_OBJECT_OUTFD imsg.
252 	 */
253 #define GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX \
254 	(MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof(struct got_imsg_raw_obj))
255 };
256 
257 /* Structure for GOT_IMSG_TAG data. */
258 struct got_imsg_tag_object {
259 	uint8_t id[SHA1_DIGEST_LENGTH];
260 	int obj_type;
261 	size_t tag_len;
262 	size_t tagger_len;
263 	time_t tagger_time;
264 	time_t tagger_gmtoff;
265 	size_t tagmsg_len;
266 
267 	/*
268 	 * Followed by tag_len + tagger_len data bytes
269 	 */
270 
271 	/*
272 	 * Followed by 'tagmsg_len' bytes of tag message data in
273 	 * one or more GOT_IMSG_TAG_TAGMSG messages.
274 	 */
275 } __attribute__((__packed__));
276 
277 /* Structure for GOT_IMSG_FETCH_HAVE_REF data. */
278 struct got_imsg_fetch_have_ref {
279 	uint8_t id[SHA1_DIGEST_LENGTH];
280 	size_t name_len;
281 	/* Followed by name_len data bytes. */
282 } __attribute__((__packed__));
283 
284 /* Structure for GOT_IMSG_FETCH_WANTED_BRANCH data. */
285 struct got_imsg_fetch_wanted_branch {
286 	size_t name_len;
287 	/* Followed by name_len data bytes. */
288 } __attribute__((__packed__));
289 
290 /* Structure for GOT_IMSG_FETCH_WANTED_REF data. */
291 struct got_imsg_fetch_wanted_ref {
292 	size_t name_len;
293 	/* Followed by name_len data bytes. */
294 } __attribute__((__packed__));
295 
296 /* Structure for GOT_IMSG_FETCH_REQUEST data. */
297 struct got_imsg_fetch_request {
298 	int fetch_all_branches;
299 	int list_refs_only;
300 	int verbosity;
301 	size_t n_have_refs;
302 	size_t n_wanted_branches;
303 	size_t n_wanted_refs;
304 	/* Followed by n_have_refs GOT_IMSG_FETCH_HAVE_REF messages. */
305 	/* Followed by n_wanted_branches times GOT_IMSG_FETCH_WANTED_BRANCH. */
306 	/* Followed by n_wanted_refs times GOT_IMSG_FETCH_WANTED_REF. */
307 } __attribute__((__packed__));
308 
309 /* Structures for GOT_IMSG_FETCH_SYMREFS data. */
310 struct got_imsg_fetch_symref {
311 	size_t name_len;
312 	size_t target_len;
313 
314 	/*
315 	 * Followed by name_len + target_len data bytes.
316 	 */
317 } __attribute__((__packed__));
318 
319 struct got_imsg_fetch_symrefs {
320 	size_t nsymrefs;
321 
322 	/* Followed by nsymrefs times of got_imsg_fetch_symref data. */
323 } __attribute__((__packed__));
324 
325 /* Structure for GOT_IMSG_FETCH_REF data. */
326 struct got_imsg_fetch_ref {
327 	/* Describes a reference which will be fetched. */
328 	uint8_t refid[SHA1_DIGEST_LENGTH];
329 	/* Followed by reference name in remaining data of imsg buffer. */
330 };
331 
332 /* Structure for GOT_IMSG_FETCH_DOWNLOAD_PROGRESS data. */
333 struct got_imsg_fetch_download_progress {
334 	/* Number of packfile data bytes downloaded so far. */
335 	off_t packfile_bytes;
336 };
337 
338 /* Structure for GOT_IMSG_IDXPACK_REQUEST data. */
339 struct got_imsg_index_pack_request {
340 	uint8_t pack_hash[SHA1_DIGEST_LENGTH];
341 } __attribute__((__packed__));
342 
343 /* Structure for GOT_IMSG_IDXPACK_PROGRESS data. */
344 struct got_imsg_index_pack_progress {
345 	/* Total number of objects in pack file. */
346 	int nobj_total;
347 
348 	/* Number of objects indexed so far. */
349 	int nobj_indexed;
350 
351 	/* Number of non-deltified objects in pack file. */
352 	int nobj_loose;
353 
354 	/* Number of deltified objects resolved so far. */
355 	int nobj_resolved;
356 };
357 
358 /* Structure for GOT_IMSG_PACKIDX. */
359 struct got_imsg_packidx {
360 	size_t len;
361 	/* Additionally, a file desciptor is passed via imsg. */
362 };
363 
364 /* Structure for GOT_IMSG_PACK. */
365 struct got_imsg_pack {
366 	char path_packfile[PATH_MAX];
367 	size_t filesize;
368 	/* Additionally, a file desciptor is passed via imsg. */
369 } __attribute__((__packed__));
370 
371 /*
372  * Structure for GOT_IMSG_PACKED_OBJECT_REQUEST and
373  * GOT_IMSG_PACKED_RAW_OBJECT_REQUEST data.
374  */
375 struct got_imsg_packed_object {
376 	uint8_t id[SHA1_DIGEST_LENGTH];
377 	int idx;
378 } __attribute__((__packed__));
379 
380 /* Structure for GOT_IMSG_COMMIT_TRAVERSAL_REQUEST  */
381 struct got_imsg_commit_traversal_request {
382 	uint8_t id[SHA1_DIGEST_LENGTH];
383 	int idx;
384 	size_t path_len;
385 	/* Followed by path_len bytes of path data */
386 } __attribute__((__packed__));
387 
388 /* Structure for GOT_IMSG_TRAVERSED_COMMITS  */
389 struct got_imsg_traversed_commits {
390 	size_t ncommits;
391 	/* Followed by ncommit IDs of SHA1_DIGEST_LENGTH each */
392 } __attribute__((__packed__));
393 
394 /*
395  * Structure for GOT_IMSG_GITCONFIG_REMOTE data.
396  */
397 struct got_imsg_remote {
398 	size_t name_len;
399 	size_t url_len;
400 	int mirror_references;
401 	int fetch_all_branches;
402 	int nbranches;
403 	int nrefs;
404 
405 	/* Followed by name_len + url_len data bytes. */
406 	/* Followed by nbranches GOT_IMSG_GITCONFIG_STR_VAL messages. */
407 	/* Followed by nrefs GOT_IMSG_GITCONFIG_STR_VAL messages. */
408 } __attribute__((__packed__));
409 
410 /*
411  * Structure for GOT_IMSG_GITCONFIG_REMOTES data.
412  */
413 struct got_imsg_remotes {
414 	int nremotes; /* This many GOT_IMSG_GITCONFIG_REMOTE messages follow. */
415 };
416 
417 struct got_remote_repo;
418 struct got_pack;
419 struct got_packidx;
420 struct got_pathlist_head;
421 
422 const struct got_error *got_send_ack(pid_t);
423 const struct got_error *got_privsep_wait_for_child(pid_t);
424 const struct got_error *got_privsep_flush_imsg(struct imsgbuf *);
425 const struct got_error *got_privsep_send_stop(int);
426 const struct got_error *got_privsep_recv_imsg(struct imsg *, struct imsgbuf *,
427     size_t);
428 void got_privsep_send_error(struct imsgbuf *, const struct got_error *);
429 const struct got_error *got_privsep_send_ack(struct imsgbuf *);
430 const struct got_error *got_privsep_wait_ack(struct imsgbuf *);
431 const struct got_error *got_privsep_send_obj_req(struct imsgbuf *, int);
432 const struct got_error *got_privsep_send_raw_obj_req(struct imsgbuf *, int);
433 const struct got_error *got_privsep_send_raw_obj_outfd(struct imsgbuf *, int);
434 const struct got_error *got_privsep_send_commit_req(struct imsgbuf *, int,
435     struct got_object_id *, int);
436 const struct got_error *got_privsep_send_tree_req(struct imsgbuf *, int,
437     struct got_object_id *, int);
438 const struct got_error *got_privsep_send_tag_req(struct imsgbuf *, int,
439     struct got_object_id *, int);
440 const struct got_error *got_privsep_send_blob_req(struct imsgbuf *, int,
441     struct got_object_id *, int);
442 const struct got_error *got_privsep_send_blob_outfd(struct imsgbuf *, int);
443 const struct got_error *got_privsep_send_tmpfd(struct imsgbuf *, int);
444 const struct got_error *got_privsep_send_obj(struct imsgbuf *,
445     struct got_object *);
446 const struct got_error *got_privsep_send_index_pack_req(struct imsgbuf *,
447     uint8_t *, int);
448 const struct got_error *got_privsep_send_index_pack_outfd(struct imsgbuf *,
449     int);
450 const struct got_error *got_privsep_recv_index_progress(int *, int *, int *,
451     int *, int *, struct imsgbuf *ibuf);
452 const struct got_error *got_privsep_send_fetch_req(struct imsgbuf *, int,
453     struct got_pathlist_head *, int, struct got_pathlist_head *,
454     struct got_pathlist_head *, int, int);
455 const struct got_error *got_privsep_send_fetch_outfd(struct imsgbuf *, int);
456 const struct got_error *got_privsep_recv_fetch_progress(int *,
457     struct got_object_id **, char **, struct got_pathlist_head *, char **,
458     off_t *, uint8_t *, struct imsgbuf *);
459 const struct got_error *got_privsep_get_imsg_obj(struct got_object **,
460     struct imsg *, struct imsgbuf *);
461 const struct got_error *got_privsep_recv_obj(struct got_object **,
462     struct imsgbuf *);
463 const struct got_error *got_privsep_send_raw_obj(struct imsgbuf *, off_t,
464     size_t, uint8_t *);
465 const struct got_error *got_privsep_recv_raw_obj(uint8_t **, off_t *, size_t *,
466     struct imsgbuf *);
467 const struct got_error *got_privsep_send_commit(struct imsgbuf *,
468     struct got_commit_object *);
469 const struct got_error *got_privsep_recv_commit(struct got_commit_object **,
470     struct imsgbuf *);
471 const struct got_error *got_privsep_recv_tree(struct got_tree_object **,
472     struct imsgbuf *);
473 const struct got_error *got_privsep_send_tree(struct imsgbuf *,
474     struct got_pathlist_head *, int);
475 const struct got_error *got_privsep_send_blob(struct imsgbuf *, size_t, size_t,
476     const uint8_t *);
477 const struct got_error *got_privsep_recv_blob(uint8_t **, size_t *, size_t *,
478     struct imsgbuf *);
479 const struct got_error *got_privsep_send_tag(struct imsgbuf *,
480     struct got_tag_object *);
481 const struct got_error *got_privsep_recv_tag(struct got_tag_object **,
482     struct imsgbuf *);
483 const struct got_error *got_privsep_init_pack_child(struct imsgbuf *,
484     struct got_pack *, struct got_packidx *);
485 const struct got_error *got_privsep_send_packed_obj_req(struct imsgbuf *, int,
486     struct got_object_id *);
487 const struct got_error *got_privsep_send_packed_raw_obj_req(struct imsgbuf *,
488     int, struct got_object_id *);
489 const struct got_error *got_privsep_send_pack_child_ready(struct imsgbuf *);
490 
491 const struct got_error *got_privsep_send_gitconfig_parse_req(struct imsgbuf *,
492     int);
493 const struct got_error *
494     got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *);
495 const struct got_error *got_privsep_send_gitconfig_repository_extensions_req(
496     struct imsgbuf *);
497 const struct got_error *got_privsep_send_gitconfig_author_name_req(
498     struct imsgbuf *);
499 const struct got_error *got_privsep_send_gitconfig_author_email_req(
500     struct imsgbuf *);
501 const struct got_error *got_privsep_send_gitconfig_remotes_req(
502     struct imsgbuf *);
503 const struct got_error *got_privsep_send_gitconfig_owner_req(struct imsgbuf *);
504 const struct got_error *got_privsep_recv_gitconfig_str(char **,
505     struct imsgbuf *);
506 const struct got_error *got_privsep_recv_gitconfig_int(int *, struct imsgbuf *);
507 const struct got_error *got_privsep_recv_gitconfig_remotes(
508     struct got_remote_repo **, int *, struct imsgbuf *);
509 
510 const struct got_error *got_privsep_send_gotconfig_parse_req(struct imsgbuf *,
511     int);
512 const struct got_error *got_privsep_send_gotconfig_author_req(struct imsgbuf *);
513 const struct got_error *got_privsep_send_gotconfig_remotes_req(
514     struct imsgbuf *);
515 const struct got_error *got_privsep_recv_gotconfig_str(char **,
516     struct imsgbuf *);
517 const struct got_error *got_privsep_recv_gotconfig_remotes(
518     struct got_remote_repo **, int *, struct imsgbuf *);
519 
520 const struct got_error *got_privsep_send_commit_traversal_request(
521     struct imsgbuf *, struct got_object_id *, int, const char *);
522 const struct got_error *got_privsep_recv_traversed_commits(
523     struct got_commit_object **, struct got_object_id **,
524     struct got_object_id_queue *, struct imsgbuf *);
525 
526 void got_privsep_exec_child(int[2], const char *, const char *);