2 * Copyright (c) 2018, 2019 Stefan Sperling <stsp@openbsd.org>
3 * Copyright (c) 2019, Ori Bernstein <ori@openbsd.org>
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.
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.
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.
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.
28 * We exec(2) after a fork(2). Parts of our library functionality are
29 * accessible via separate executables in a libexec directory.
32 #define GOT_IMSG_FD_CHILD (STDERR_FILENO + 1)
34 #ifndef GOT_LIBEXECDIR
35 #define GOT_LIBEXECDIR /usr/libexec
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_FETCH_PACK got-fetch-pack
47 #define GOT_PROG_INDEX_PACK got-index-pack
48 #define GOT_PROG_SEND_PACK got-send-pack
50 #define GOT_STRINGIFY(x) #x
51 #define GOT_STRINGVAL(x) GOT_STRINGIFY(x)
53 /* Paths to helper programs in libexec directory */
54 #define GOT_PATH_PROG_READ_OBJECT \
55 GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_OBJECT)
56 #define GOT_PATH_PROG_READ_TREE \
57 GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_TREE)
58 #define GOT_PATH_PROG_READ_COMMIT \
59 GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_COMMIT)
60 #define GOT_PATH_PROG_READ_BLOB \
61 GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_BLOB)
62 #define GOT_PATH_PROG_READ_TAG \
63 GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_TAG)
64 #define GOT_PATH_PROG_READ_PACK \
65 GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_PACK)
66 #define GOT_PATH_PROG_READ_GITCONFIG \
67 GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_READ_GITCONFIG)
68 #define GOT_PATH_PROG_FETCH_PACK \
69 GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_FETCH_PACK)
70 #define GOT_PATH_PROG_SEND_PACK \
71 GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_SEND_PACK)
72 #define GOT_PATH_PROG_INDEX_PACK \
73 GOT_STRINGVAL(GOT_LIBEXECDIR) "/" GOT_STRINGVAL(GOT_PROG_INDEX_PACK)
75 struct got_privsep_child {
82 /* An error occured while processing a request. */
85 /* Stop the child process. */
89 * Messages concerned with read access to objects in a repository.
90 * Object and pack files are opened by the main process, where
91 * data may be read as a byte string but without any interpretation.
92 * Decompression and parsing of object and pack files occurs in a
93 * separate process which runs under pledge("stdio recvfd").
94 * This sandboxes our own repository parsing code, as well as zlib.
96 GOT_IMSG_OBJECT_REQUEST,
98 GOT_IMSG_COMMIT_REQUEST,
100 GOT_IMSG_COMMIT_LOGMSG,
101 GOT_IMSG_TREE_REQUEST,
104 GOT_IMSG_BLOB_REQUEST,
107 GOT_IMSG_TAG_REQUEST,
111 /* Messages related to networking. */
112 GOT_IMSG_FETCH_REQUEST,
113 GOT_IMSG_FETCH_SYMREFS,
114 GOT_IMSG_FETCH_PROGRESS,
116 GOT_IMSG_IDXPACK_REQUEST,
117 GOT_IMSG_IDXPACK_DONE,
119 /* Messages related to pack files. */
122 GOT_IMSG_PACKED_OBJECT_REQUEST,
123 GOT_IMSG_COMMIT_TRAVERSAL_REQUEST,
124 GOT_IMSG_TRAVERSED_COMMITS,
125 GOT_IMSG_COMMIT_TRAVERSAL_DONE,
127 /* Message sending file descriptor to a temporary file. */
130 /* Messages related to gitconfig files. */
131 GOT_IMSG_GITCONFIG_PARSE_REQUEST,
132 GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST,
133 GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST,
134 GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST,
135 GOT_IMSG_GITCONFIG_REMOTES_REQUEST,
136 GOT_IMSG_GITCONFIG_INT_VAL,
137 GOT_IMSG_GITCONFIG_STR_VAL,
138 GOT_IMSG_GITCONFIG_REMOTES,
139 GOT_IMSG_GITCONFIG_REMOTE,
140 GOT_IMSG_GITCONFIG_OWNER_REQUEST,
141 GOT_IMSG_GITCONFIG_OWNER,
144 /* Structure for GOT_IMSG_ERROR. */
145 struct got_imsg_error {
146 int code; /* an error code from got_error.h */
147 int errno_code; /* in case code equals GOT_ERR_ERRNO */
148 } __attribute__((__packed__));
151 * Structure for GOT_IMSG_TREE_REQUEST and GOT_IMSG_OBJECT data.
153 struct got_imsg_object {
154 uint8_t id[SHA1_DIGEST_LENGTH];
156 /* These fields are the same as in struct got_object. */
163 } __attribute__((__packed__));
165 /* Structure for GOT_IMSG_COMMIT data. */
166 struct got_imsg_commit_object {
167 uint8_t tree_id[SHA1_DIGEST_LENGTH];
170 time_t author_gmtoff;
171 size_t committer_len;
172 time_t committer_time;
173 time_t committer_gmtoff;
178 * Followed by author_len + committer_len data bytes
181 /* Followed by 'nparents' SHA1_DIGEST_LENGTH length strings */
184 * Followed by 'logmsg_len' bytes of commit log message data in
185 * one or more GOT_IMSG_COMMIT_LOGMSG messages.
187 } __attribute__((__packed__));
190 /* Structure for GOT_IMSG_TREE_ENTRY. */
191 struct got_imsg_tree_entry {
192 char id[SHA1_DIGEST_LENGTH];
194 /* Followed by entry's name in remaining data of imsg buffer. */
195 } __attribute__((__packed__));
197 /* Structure for GOT_IMSG_TREE_OBJECT_REPLY data. */
198 struct got_imsg_tree_object {
199 int nentries; /* This many TREE_ENTRY messages follow. */
202 /* Structure for GOT_IMSG_BLOB. */
203 struct got_imsg_blob {
208 * If size <= GOT_PRIVSEP_INLINE_BLOB_DATA_MAX, blob data follows
209 * in the imsg buffer. Otherwise, blob data has been written to a
210 * file descriptor passed via the GOT_IMSG_BLOB_OUTFD imsg.
212 #define GOT_PRIVSEP_INLINE_BLOB_DATA_MAX \
213 (MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof(struct got_imsg_blob))
217 /* Structure for GOT_IMSG_TAG data. */
218 struct got_imsg_tag_object {
219 uint8_t id[SHA1_DIGEST_LENGTH];
224 time_t tagger_gmtoff;
228 * Followed by tag_len + tagger_len data bytes
232 * Followed by 'tagmsg_len' bytes of tag message data in
233 * one or more GOT_IMSG_TAG_TAGMSG messages.
235 } __attribute__((__packed__));
237 /* Structures for GOT_IMSG_FETCH_SYMREFS data. */
238 struct got_imsg_fetch_symref {
243 * Followed by name_len + target_len data bytes.
245 } __attribute__((__packed__));
247 struct got_imsg_fetch_symrefs {
250 /* Followed by nsymrefs times of got_imsg_fetch_symref data. */
251 } __attribute__((__packed__));
253 /* Structure for GOT_IMSG_FETCH_PROGRESS data. */
254 struct got_imsg_fetch_progress {
255 /* Describes a reference which will be fetched. */
256 uint8_t refid[SHA1_DIGEST_LENGTH];
257 /* Followed by reference name in remaining data of imsg buffer. */
260 /* Structure for GOT_IMSG_PACKIDX. */
261 struct got_imsg_packidx {
263 /* Additionally, a file desciptor is passed via imsg. */
266 /* Structure for GOT_IMSG_PACK. */
267 struct got_imsg_pack {
268 char path_packfile[PATH_MAX];
270 /* Additionally, a file desciptor is passed via imsg. */
271 } __attribute__((__packed__));
274 * Structure for GOT_IMSG_PACKED_OBJECT_REQUEST data.
276 struct got_imsg_packed_object {
277 uint8_t id[SHA1_DIGEST_LENGTH];
279 } __attribute__((__packed__));
281 /* Structure for GOT_IMSG_COMMIT_TRAVERSAL_REQUEST */
282 struct got_imsg_commit_traversal_request {
283 uint8_t id[SHA1_DIGEST_LENGTH];
286 /* Followed by path_len bytes of path data */
287 } __attribute__((__packed__));
289 /* Structure for GOT_IMSG_TRAVERSED_COMMITS */
290 struct got_imsg_traversed_commits {
292 /* Followed by ncommit IDs of SHA1_DIGEST_LENGTH each */
293 } __attribute__((__packed__));
296 * Structure for GOT_IMSG_GITCONFIG_REMOTE data.
298 struct got_imsg_remote {
302 /* Followed by name_len + url_len data bytes. */
306 * Structure for GOT_IMSG_GITCONFIG_REMOTES data.
308 struct got_imsg_remotes {
309 int nremotes; /* This many GOT_IMSG_GITCONFIG_REMOTE messages follow. */
312 struct got_remote_repo;
315 struct got_pathlist_head;
317 const struct got_error *got_send_ack(pid_t);
318 const struct got_error *got_privsep_wait_for_child(pid_t);
319 const struct got_error *got_privsep_send_stop(int);
320 const struct got_error *got_privsep_recv_imsg(struct imsg *, struct imsgbuf *,
322 void got_privsep_send_error(struct imsgbuf *, const struct got_error *);
323 const struct got_error *got_privsep_send_ack(struct imsgbuf *);
324 const struct got_error *got_privsep_wait_ack(struct imsgbuf *);
325 const struct got_error *got_privsep_send_obj_req(struct imsgbuf *, int);
326 const struct got_error *got_privsep_send_commit_req(struct imsgbuf *, int,
327 struct got_object_id *, int);
328 const struct got_error *got_privsep_send_tree_req(struct imsgbuf *, int,
329 struct got_object_id *, int);
330 const struct got_error *got_privsep_send_tag_req(struct imsgbuf *, int,
331 struct got_object_id *, int);
332 const struct got_error *got_privsep_send_blob_req(struct imsgbuf *, int,
333 struct got_object_id *, int);
334 const struct got_error *got_privsep_send_blob_outfd(struct imsgbuf *, int);
335 const struct got_error *got_privsep_send_tmpfd(struct imsgbuf *, int);
336 const struct got_error *got_privsep_send_obj(struct imsgbuf *,
337 struct got_object *);
338 const struct got_error *got_privsep_send_index_pack_req(struct imsgbuf *, int,
339 struct got_object_id *);
340 const struct got_error *got_privsep_send_index_pack_done(struct imsgbuf *);
341 const struct got_error *got_privsep_wait_index_pack_done(struct imsgbuf *);
342 const struct got_error *got_privsep_send_fetch_req(struct imsgbuf *, int);
343 const struct got_error *got_privsep_send_fetch_symrefs(struct imsgbuf *,
344 struct got_pathlist_head *);
345 const struct got_error *got_privsep_send_fetch_progress(struct imsgbuf *,
346 struct got_object_id *, const char *);
347 const struct got_error *got_privsep_recv_fetch_progress(int *,
348 struct got_object_id **, char **, struct got_pathlist_head *,
350 const struct got_error *got_privsep_send_fetch_done(struct imsgbuf *,
351 struct got_object_id);
352 const struct got_error *got_privsep_get_imsg_obj(struct got_object **,
353 struct imsg *, struct imsgbuf *);
354 const struct got_error *got_privsep_recv_obj(struct got_object **,
356 const struct got_error *got_privsep_send_commit(struct imsgbuf *,
357 struct got_commit_object *);
358 const struct got_error *got_privsep_recv_commit(struct got_commit_object **,
360 const struct got_error *got_privsep_recv_tree(struct got_tree_object **,
362 const struct got_error *got_privsep_send_tree(struct imsgbuf *,
363 struct got_pathlist_head *, int);
364 const struct got_error *got_privsep_send_blob(struct imsgbuf *, size_t, size_t,
366 const struct got_error *got_privsep_recv_blob(uint8_t **, size_t *, size_t *,
368 const struct got_error *got_privsep_send_tag(struct imsgbuf *,
369 struct got_tag_object *);
370 const struct got_error *got_privsep_recv_tag(struct got_tag_object **,
372 const struct got_error *got_privsep_init_pack_child(struct imsgbuf *,
373 struct got_pack *, struct got_packidx *);
374 const struct got_error *got_privsep_send_packed_obj_req(struct imsgbuf *, int,
375 struct got_object_id *);
376 const struct got_error *got_privsep_send_pack_child_ready(struct imsgbuf *);
378 const struct got_error *got_privsep_send_gitconfig_parse_req(struct imsgbuf *,
380 const struct got_error *
381 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *);
382 const struct got_error *got_privsep_send_gitconfig_author_name_req(
384 const struct got_error *got_privsep_send_gitconfig_author_email_req(
386 const struct got_error *got_privsep_send_gitconfig_remotes_req(
388 const struct got_error *got_privsep_send_gitconfig_owner_req(struct imsgbuf *);
389 const struct got_error *got_privsep_send_gitconfig_str(struct imsgbuf *,
391 const struct got_error *got_privsep_recv_gitconfig_str(char **,
393 const struct got_error *got_privsep_send_gitconfig_int(struct imsgbuf *, int);
394 const struct got_error *got_privsep_recv_gitconfig_int(int *, struct imsgbuf *);
395 const struct got_error *got_privsep_send_gitconfig_remotes(struct imsgbuf *,
396 struct got_remote_repo *, int);
397 const struct got_error *got_privsep_recv_gitconfig_remotes(
398 struct got_remote_repo **, int *, struct imsgbuf *);
400 const struct got_error *got_privsep_send_commit_traversal_request(
401 struct imsgbuf *, struct got_object_id *, int, const char *);
402 const struct got_error *got_privsep_recv_traversed_commits(
403 struct got_commit_object **, struct got_object_id **,
404 struct got_object_id_queue *, struct imsgbuf *);
405 const struct got_error *got_privsep_send_traversed_commits(
406 struct got_object_id *, size_t, struct imsgbuf *);
407 const struct got_error *got_privsep_send_commit_traversal_done(
410 void got_privsep_exec_child(int[2], const char *, const char *);