2 3efd8e31 2022-10-23 thomas * Copyright (c) 2022 Stefan Sperling <stsp@openbsd.org>
4 3efd8e31 2022-10-23 thomas * Permission to use, copy, modify, and distribute this software for any
5 3efd8e31 2022-10-23 thomas * purpose with or without fee is hereby granted, provided that the above
6 3efd8e31 2022-10-23 thomas * copyright notice and this permission notice appear in all copies.
8 3efd8e31 2022-10-23 thomas * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 3efd8e31 2022-10-23 thomas * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 3efd8e31 2022-10-23 thomas * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 3efd8e31 2022-10-23 thomas * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 3efd8e31 2022-10-23 thomas * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 3efd8e31 2022-10-23 thomas * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 3efd8e31 2022-10-23 thomas * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 fde1a996 2023-08-23 thomas #include "got_compat.h"
19 3efd8e31 2022-10-23 thomas #include <sys/queue.h>
20 3efd8e31 2022-10-23 thomas #include <sys/time.h>
21 3efd8e31 2022-10-23 thomas #include <sys/types.h>
22 3efd8e31 2022-10-23 thomas #include <sys/stat.h>
23 3efd8e31 2022-10-23 thomas #include <sys/socket.h>
24 3efd8e31 2022-10-23 thomas #include <sys/un.h>
25 3efd8e31 2022-10-23 thomas #include <sys/wait.h>
27 3efd8e31 2022-10-23 thomas #include <fcntl.h>
28 3efd8e31 2022-10-23 thomas #include <err.h>
29 3efd8e31 2022-10-23 thomas #include <errno.h>
30 3efd8e31 2022-10-23 thomas #include <event.h>
31 3efd8e31 2022-10-23 thomas #include <limits.h>
32 3efd8e31 2022-10-23 thomas #include <pwd.h>
33 3efd8e31 2022-10-23 thomas #include <imsg.h>
34 3efd8e31 2022-10-23 thomas #include <signal.h>
35 3efd8e31 2022-10-23 thomas #include <stdarg.h>
36 3efd8e31 2022-10-23 thomas #include <stdio.h>
37 3efd8e31 2022-10-23 thomas #include <stdlib.h>
38 3efd8e31 2022-10-23 thomas #include <string.h>
39 3efd8e31 2022-10-23 thomas #include <syslog.h>
40 3efd8e31 2022-10-23 thomas #include <unistd.h>
42 3efd8e31 2022-10-23 thomas #include "got_error.h"
43 3efd8e31 2022-10-23 thomas #include "got_opentemp.h"
44 3efd8e31 2022-10-23 thomas #include "got_path.h"
45 3efd8e31 2022-10-23 thomas #include "got_repository.h"
46 3efd8e31 2022-10-23 thomas #include "got_object.h"
47 3efd8e31 2022-10-23 thomas #include "got_reference.h"
49 3efd8e31 2022-10-23 thomas #include "got_lib_delta.h"
50 3efd8e31 2022-10-23 thomas #include "got_lib_object.h"
51 3efd8e31 2022-10-23 thomas #include "got_lib_object_cache.h"
52 be288a59 2023-02-23 thomas #include "got_lib_hash.h"
53 3efd8e31 2022-10-23 thomas #include "got_lib_gitproto.h"
54 3efd8e31 2022-10-23 thomas #include "got_lib_pack.h"
55 3efd8e31 2022-10-23 thomas #include "got_lib_repository.h"
57 3efd8e31 2022-10-23 thomas #include "gotd.h"
58 3efd8e31 2022-10-23 thomas #include "log.h"
59 2b3d32a1 2022-12-30 thomas #include "listen.h"
60 729a7e24 2022-11-17 thomas #include "auth.h"
61 62ee7d94 2023-01-10 thomas #include "session.h"
62 3efd8e31 2022-10-23 thomas #include "repo_read.h"
63 3efd8e31 2022-10-23 thomas #include "repo_write.h"
65 3efd8e31 2022-10-23 thomas #ifndef nitems
66 3efd8e31 2022-10-23 thomas #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
69 7b1db75e 2023-01-14 thomas enum gotd_client_state {
70 7b1db75e 2023-01-14 thomas GOTD_CLIENT_STATE_NEW,
71 7b1db75e 2023-01-14 thomas GOTD_CLIENT_STATE_ACCESS_GRANTED,
74 78943464 2023-06-22 thomas struct gotd_child_proc {
75 78943464 2023-06-22 thomas pid_t pid;
76 78943464 2023-06-22 thomas enum gotd_procid type;
77 78943464 2023-06-22 thomas char repo_name[NAME_MAX];
78 78943464 2023-06-22 thomas char repo_path[PATH_MAX];
79 78943464 2023-06-22 thomas int pipe[2];
80 78943464 2023-06-22 thomas struct gotd_imsgev iev;
81 2c8fb90b 2023-06-25 thomas struct event tmo;
83 2c8fb90b 2023-06-25 thomas TAILQ_ENTRY(gotd_child_proc) entry;
85 2c8fb90b 2023-06-25 thomas TAILQ_HEAD(gotd_procs, gotd_child_proc) procs;
87 3efd8e31 2022-10-23 thomas struct gotd_client {
88 3efd8e31 2022-10-23 thomas STAILQ_ENTRY(gotd_client) entry;
89 3efd8e31 2022-10-23 thomas enum gotd_client_state state;
90 3efd8e31 2022-10-23 thomas uint32_t id;
92 3efd8e31 2022-10-23 thomas struct gotd_imsgev iev;
93 3efd8e31 2022-10-23 thomas struct event tmo;
94 3efd8e31 2022-10-23 thomas uid_t euid;
95 3efd8e31 2022-10-23 thomas gid_t egid;
96 27b11d77 2023-01-14 thomas struct gotd_child_proc *repo;
97 c669c489 2022-12-30 thomas struct gotd_child_proc *auth;
98 62ee7d94 2023-01-10 thomas struct gotd_child_proc *session;
99 c669c489 2022-12-30 thomas int required_auth;
101 3efd8e31 2022-10-23 thomas STAILQ_HEAD(gotd_clients, gotd_client);
103 3efd8e31 2022-10-23 thomas static struct gotd_clients gotd_clients[GOTD_CLIENT_TABLE_SIZE];
104 3efd8e31 2022-10-23 thomas static SIPHASH_KEY clients_hash_key;
105 3efd8e31 2022-10-23 thomas volatile int client_cnt;
106 95ef3f8a 2022-12-30 thomas static struct timeval auth_timeout = { 5, 0 };
107 3efd8e31 2022-10-23 thomas static struct gotd gotd;
109 3efd8e31 2022-10-23 thomas void gotd_sighdlr(int sig, short event, void *arg);
110 c902213d 2022-10-29 thomas static void gotd_shutdown(void);
111 62ee7d94 2023-01-10 thomas static const struct got_error *start_session_child(struct gotd_client *,
112 62ee7d94 2023-01-10 thomas struct gotd_repo *, char *, const char *, int, int);
113 85b37c72 2022-12-30 thomas static const struct got_error *start_repo_child(struct gotd_client *,
114 85b37c72 2022-12-30 thomas enum gotd_procid, struct gotd_repo *, char *, const char *, int, int);
115 c669c489 2022-12-30 thomas static const struct got_error *start_auth_child(struct gotd_client *, int,
116 c669c489 2022-12-30 thomas struct gotd_repo *, char *, const char *, int, int);
117 85b37c72 2022-12-30 thomas static void kill_proc(struct gotd_child_proc *, int);
118 2c8fb90b 2023-06-25 thomas static void disconnect(struct gotd_client *);
120 3efd8e31 2022-10-23 thomas __dead static void
121 96d694ac 2023-02-17 thomas usage(void)
123 c855c9f0 2023-01-19 thomas fprintf(stderr, "usage: %s [-dnv] [-f config-file]\n", getprogname());
127 3efd8e31 2022-10-23 thomas static int
128 3efd8e31 2022-10-23 thomas unix_socket_listen(const char *unix_socket_path, uid_t uid, gid_t gid)
130 3efd8e31 2022-10-23 thomas struct sockaddr_un sun;
131 3efd8e31 2022-10-23 thomas int fd = -1;
132 3efd8e31 2022-10-23 thomas mode_t old_umask, mode;
133 cff566e8 2023-08-23 thomas int sock_flags = SOCK_STREAM | SOCK_NONBLOCK;
135 cff566e8 2023-08-23 thomas #ifdef SOCK_CLOEXEC
136 cff566e8 2023-08-23 thomas sock_flags |= SOCK_CLOEXEC;
139 cff566e8 2023-08-23 thomas fd = socket(AF_UNIX, sock_flags, 0);
140 3efd8e31 2022-10-23 thomas if (fd == -1) {
141 3efd8e31 2022-10-23 thomas log_warn("socket");
142 3efd8e31 2022-10-23 thomas return -1;
145 3efd8e31 2022-10-23 thomas sun.sun_family = AF_UNIX;
146 3efd8e31 2022-10-23 thomas if (strlcpy(sun.sun_path, unix_socket_path,
147 3efd8e31 2022-10-23 thomas sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
148 3efd8e31 2022-10-23 thomas log_warnx("%s: name too long", unix_socket_path);
149 3efd8e31 2022-10-23 thomas close(fd);
150 3efd8e31 2022-10-23 thomas return -1;
153 3efd8e31 2022-10-23 thomas if (unlink(unix_socket_path) == -1) {
154 3efd8e31 2022-10-23 thomas if (errno != ENOENT) {
155 3efd8e31 2022-10-23 thomas log_warn("unlink %s", unix_socket_path);
156 3efd8e31 2022-10-23 thomas close(fd);
157 3efd8e31 2022-10-23 thomas return -1;
161 3efd8e31 2022-10-23 thomas old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
162 f2fc8ce0 2023-01-06 thomas mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
164 3efd8e31 2022-10-23 thomas if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
165 3efd8e31 2022-10-23 thomas log_warn("bind: %s", unix_socket_path);
166 3efd8e31 2022-10-23 thomas close(fd);
167 3efd8e31 2022-10-23 thomas umask(old_umask);
168 3efd8e31 2022-10-23 thomas return -1;
171 3efd8e31 2022-10-23 thomas umask(old_umask);
173 3efd8e31 2022-10-23 thomas if (chmod(unix_socket_path, mode) == -1) {
174 3efd8e31 2022-10-23 thomas log_warn("chmod %o %s", mode, unix_socket_path);
175 3efd8e31 2022-10-23 thomas close(fd);
176 3efd8e31 2022-10-23 thomas unlink(unix_socket_path);
177 3efd8e31 2022-10-23 thomas return -1;
180 3efd8e31 2022-10-23 thomas if (chown(unix_socket_path, uid, gid) == -1) {
181 3efd8e31 2022-10-23 thomas log_warn("chown %s uid=%d gid=%d", unix_socket_path, uid, gid);
182 3efd8e31 2022-10-23 thomas close(fd);
183 3efd8e31 2022-10-23 thomas unlink(unix_socket_path);
184 3efd8e31 2022-10-23 thomas return -1;
187 3efd8e31 2022-10-23 thomas if (listen(fd, GOTD_UNIX_SOCKET_BACKLOG) == -1) {
188 3efd8e31 2022-10-23 thomas log_warn("listen");
189 3efd8e31 2022-10-23 thomas close(fd);
190 3efd8e31 2022-10-23 thomas unlink(unix_socket_path);
191 3efd8e31 2022-10-23 thomas return -1;
194 3efd8e31 2022-10-23 thomas return fd;
197 3efd8e31 2022-10-23 thomas static uint64_t
198 3efd8e31 2022-10-23 thomas client_hash(uint32_t client_id)
200 3efd8e31 2022-10-23 thomas return SipHash24(&clients_hash_key, &client_id, sizeof(client_id));
203 3efd8e31 2022-10-23 thomas static void
204 3efd8e31 2022-10-23 thomas add_client(struct gotd_client *client)
206 3efd8e31 2022-10-23 thomas uint64_t slot = client_hash(client->id) % nitems(gotd_clients);
207 3efd8e31 2022-10-23 thomas STAILQ_INSERT_HEAD(&gotd_clients[slot], client, entry);
208 3efd8e31 2022-10-23 thomas client_cnt++;
211 3efd8e31 2022-10-23 thomas static struct gotd_client *
212 3efd8e31 2022-10-23 thomas find_client(uint32_t client_id)
214 3efd8e31 2022-10-23 thomas uint64_t slot;
215 3efd8e31 2022-10-23 thomas struct gotd_client *c;
217 3efd8e31 2022-10-23 thomas slot = client_hash(client_id) % nitems(gotd_clients);
218 3efd8e31 2022-10-23 thomas STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
219 3efd8e31 2022-10-23 thomas if (c->id == client_id)
220 3efd8e31 2022-10-23 thomas return c;
223 3efd8e31 2022-10-23 thomas return NULL;
226 85b37c72 2022-12-30 thomas static struct gotd_client *
227 85b37c72 2022-12-30 thomas find_client_by_proc_fd(int fd)
229 85b37c72 2022-12-30 thomas uint64_t slot;
231 85b37c72 2022-12-30 thomas for (slot = 0; slot < nitems(gotd_clients); slot++) {
232 85b37c72 2022-12-30 thomas struct gotd_client *c;
234 85b37c72 2022-12-30 thomas STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
235 27b11d77 2023-01-14 thomas if (c->repo && c->repo->iev.ibuf.fd == fd)
236 85b37c72 2022-12-30 thomas return c;
237 c669c489 2022-12-30 thomas if (c->auth && c->auth->iev.ibuf.fd == fd)
238 62ee7d94 2023-01-10 thomas return c;
239 62ee7d94 2023-01-10 thomas if (c->session && c->session->iev.ibuf.fd == fd)
240 c669c489 2022-12-30 thomas return c;
244 3efd8e31 2022-10-23 thomas return NULL;
247 3efd8e31 2022-10-23 thomas static int
248 3efd8e31 2022-10-23 thomas client_is_reading(struct gotd_client *client)
250 27b11d77 2023-01-14 thomas return (client->required_auth &
251 27b11d77 2023-01-14 thomas (GOTD_AUTH_READ | GOTD_AUTH_WRITE)) == GOTD_AUTH_READ;
254 3efd8e31 2022-10-23 thomas static int
255 3efd8e31 2022-10-23 thomas client_is_writing(struct gotd_client *client)
257 27b11d77 2023-01-14 thomas return (client->required_auth &
258 27b11d77 2023-01-14 thomas (GOTD_AUTH_READ | GOTD_AUTH_WRITE)) ==
259 27b11d77 2023-01-14 thomas (GOTD_AUTH_READ | GOTD_AUTH_WRITE);
262 3efd8e31 2022-10-23 thomas static const struct got_error *
263 3efd8e31 2022-10-23 thomas ensure_client_is_not_writing(struct gotd_client *client)
265 3efd8e31 2022-10-23 thomas if (client_is_writing(client)) {
266 3efd8e31 2022-10-23 thomas return got_error_fmt(GOT_ERR_BAD_PACKET,
267 3efd8e31 2022-10-23 thomas "uid %d made a read-request but is writing to "
268 3efd8e31 2022-10-23 thomas "a repository", client->euid);
271 3efd8e31 2022-10-23 thomas return NULL;
274 3efd8e31 2022-10-23 thomas static const struct got_error *
275 3efd8e31 2022-10-23 thomas ensure_client_is_not_reading(struct gotd_client *client)
277 3efd8e31 2022-10-23 thomas if (client_is_reading(client)) {
278 3efd8e31 2022-10-23 thomas return got_error_fmt(GOT_ERR_BAD_PACKET,
279 3efd8e31 2022-10-23 thomas "uid %d made a write-request but is reading from "
280 3efd8e31 2022-10-23 thomas "a repository", client->euid);
283 3efd8e31 2022-10-23 thomas return NULL;
286 85b37c72 2022-12-30 thomas static void
287 2c8fb90b 2023-06-25 thomas proc_done(struct gotd_child_proc *proc)
289 2c8fb90b 2023-06-25 thomas struct gotd_client *client;
291 2c8fb90b 2023-06-25 thomas TAILQ_REMOVE(&procs, proc, entry);
293 2c8fb90b 2023-06-25 thomas client = find_client_by_proc_fd(proc->iev.ibuf.fd);
294 2c8fb90b 2023-06-25 thomas if (client != NULL) {
295 2c8fb90b 2023-06-25 thomas if (proc == client->repo)
296 2c8fb90b 2023-06-25 thomas client->repo = NULL;
297 2c8fb90b 2023-06-25 thomas if (proc == client->auth)
298 2c8fb90b 2023-06-25 thomas client->auth = NULL;
299 2c8fb90b 2023-06-25 thomas if (proc == client->session)
300 2c8fb90b 2023-06-25 thomas client->session = NULL;
301 2c8fb90b 2023-06-25 thomas disconnect(client);
304 2c8fb90b 2023-06-25 thomas evtimer_del(&proc->tmo);
306 2c8fb90b 2023-06-25 thomas if (proc->iev.ibuf.fd != -1) {
307 2c8fb90b 2023-06-25 thomas event_del(&proc->iev.ev);
308 2c8fb90b 2023-06-25 thomas msgbuf_clear(&proc->iev.ibuf.w);
309 2c8fb90b 2023-06-25 thomas close(proc->iev.ibuf.fd);
312 62ee7d94 2023-01-10 thomas free(proc);
315 b993e8cc 2023-06-22 thomas static void
316 b993e8cc 2023-06-22 thomas kill_repo_proc(struct gotd_client *client)
318 b993e8cc 2023-06-22 thomas if (client->repo == NULL)
321 2c8fb90b 2023-06-25 thomas kill_proc(client->repo, 0);
322 b993e8cc 2023-06-22 thomas client->repo = NULL;
325 3efd8e31 2022-10-23 thomas static void
326 c669c489 2022-12-30 thomas kill_auth_proc(struct gotd_client *client)
328 c669c489 2022-12-30 thomas if (client->auth == NULL)
331 2c8fb90b 2023-06-25 thomas kill_proc(client->auth, 0);
332 c669c489 2022-12-30 thomas client->auth = NULL;
335 c669c489 2022-12-30 thomas static void
336 62ee7d94 2023-01-10 thomas kill_session_proc(struct gotd_client *client)
338 62ee7d94 2023-01-10 thomas if (client->session == NULL)
341 2c8fb90b 2023-06-25 thomas kill_proc(client->session, 0);
342 62ee7d94 2023-01-10 thomas client->session = NULL;
345 62ee7d94 2023-01-10 thomas static void
346 3efd8e31 2022-10-23 thomas disconnect(struct gotd_client *client)
348 3efd8e31 2022-10-23 thomas struct gotd_imsg_disconnect idisconnect;
349 78943464 2023-06-22 thomas struct gotd_child_proc *listen_proc = gotd.listen_proc;
350 3efd8e31 2022-10-23 thomas uint64_t slot;
352 3efd8e31 2022-10-23 thomas log_debug("uid %d: disconnecting", client->euid);
354 c669c489 2022-12-30 thomas kill_auth_proc(client);
355 62ee7d94 2023-01-10 thomas kill_session_proc(client);
356 b993e8cc 2023-06-22 thomas kill_repo_proc(client);
358 52939b68 2023-02-17 thomas idisconnect.client_id = client->id;
359 2b3d32a1 2022-12-30 thomas if (gotd_imsg_compose_event(&listen_proc->iev,
360 2b3d32a1 2022-12-30 thomas GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
361 2b3d32a1 2022-12-30 thomas &idisconnect, sizeof(idisconnect)) == -1)
362 2b3d32a1 2022-12-30 thomas log_warn("imsg compose DISCONNECT");
364 3efd8e31 2022-10-23 thomas slot = client_hash(client->id) % nitems(gotd_clients);
365 3efd8e31 2022-10-23 thomas STAILQ_REMOVE(&gotd_clients[slot], client, gotd_client, entry);
366 3efd8e31 2022-10-23 thomas imsg_clear(&client->iev.ibuf);
367 3efd8e31 2022-10-23 thomas event_del(&client->iev.ev);
368 3efd8e31 2022-10-23 thomas evtimer_del(&client->tmo);
369 62ee7d94 2023-01-10 thomas if (client->fd != -1)
370 62ee7d94 2023-01-10 thomas close(client->fd);
371 62ee7d94 2023-01-10 thomas else if (client->iev.ibuf.fd != -1)
372 62ee7d94 2023-01-10 thomas close(client->iev.ibuf.fd);
373 3efd8e31 2022-10-23 thomas free(client);
374 3efd8e31 2022-10-23 thomas client_cnt--;
377 3efd8e31 2022-10-23 thomas static void
378 3efd8e31 2022-10-23 thomas disconnect_on_error(struct gotd_client *client, const struct got_error *err)
380 3efd8e31 2022-10-23 thomas struct imsgbuf ibuf;
382 a6153ffb 2023-08-12 thomas if (err->code != GOT_ERR_EOF) {
383 a6153ffb 2023-08-12 thomas log_warnx("uid %d: %s", client->euid, err->msg);
384 a6153ffb 2023-08-12 thomas if (client->fd != -1) {
385 a6153ffb 2023-08-12 thomas imsg_init(&ibuf, client->fd);
386 a6153ffb 2023-08-12 thomas gotd_imsg_send_error(&ibuf, 0, PROC_GOTD, err);
387 a6153ffb 2023-08-12 thomas imsg_clear(&ibuf);
390 3efd8e31 2022-10-23 thomas disconnect(client);
393 c902213d 2022-10-29 thomas static const struct got_error *
394 c902213d 2022-10-29 thomas send_repo_info(struct gotd_imsgev *iev, struct gotd_repo *repo)
396 c902213d 2022-10-29 thomas const struct got_error *err = NULL;
397 c902213d 2022-10-29 thomas struct gotd_imsg_info_repo irepo;
399 c902213d 2022-10-29 thomas memset(&irepo, 0, sizeof(irepo));
401 c902213d 2022-10-29 thomas if (strlcpy(irepo.repo_name, repo->name, sizeof(irepo.repo_name))
402 c902213d 2022-10-29 thomas >= sizeof(irepo.repo_name))
403 c902213d 2022-10-29 thomas return got_error_msg(GOT_ERR_NO_SPACE, "repo name too long");
404 c902213d 2022-10-29 thomas if (strlcpy(irepo.repo_path, repo->path, sizeof(irepo.repo_path))
405 c902213d 2022-10-29 thomas >= sizeof(irepo.repo_path))
406 c902213d 2022-10-29 thomas return got_error_msg(GOT_ERR_NO_SPACE, "repo path too long");
408 c902213d 2022-10-29 thomas if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_REPO, PROC_GOTD, -1,
409 c902213d 2022-10-29 thomas &irepo, sizeof(irepo)) == -1) {
410 c902213d 2022-10-29 thomas err = got_error_from_errno("imsg compose INFO_REPO");
412 c902213d 2022-10-29 thomas return err;
415 c902213d 2022-10-29 thomas return NULL;
418 c902213d 2022-10-29 thomas static const struct got_error *
419 c902213d 2022-10-29 thomas send_client_info(struct gotd_imsgev *iev, struct gotd_client *client)
421 c902213d 2022-10-29 thomas const struct got_error *err = NULL;
422 c902213d 2022-10-29 thomas struct gotd_imsg_info_client iclient;
423 c902213d 2022-10-29 thomas struct gotd_child_proc *proc;
425 c902213d 2022-10-29 thomas memset(&iclient, 0, sizeof(iclient));
426 c902213d 2022-10-29 thomas iclient.euid = client->euid;
427 c902213d 2022-10-29 thomas iclient.egid = client->egid;
429 27b11d77 2023-01-14 thomas proc = client->repo;
430 c902213d 2022-10-29 thomas if (proc) {
431 414e37cb 2022-12-30 thomas if (strlcpy(iclient.repo_name, proc->repo_path,
432 c902213d 2022-10-29 thomas sizeof(iclient.repo_name)) >= sizeof(iclient.repo_name)) {
433 c902213d 2022-10-29 thomas return got_error_msg(GOT_ERR_NO_SPACE,
434 c902213d 2022-10-29 thomas "repo name too long");
436 c902213d 2022-10-29 thomas if (client_is_writing(client))
437 c902213d 2022-10-29 thomas iclient.is_writing = 1;
439 62ee7d94 2023-01-10 thomas iclient.repo_child_pid = proc->pid;
442 62ee7d94 2023-01-10 thomas if (client->session)
443 62ee7d94 2023-01-10 thomas iclient.session_child_pid = client->session->pid;
445 c902213d 2022-10-29 thomas if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_CLIENT, PROC_GOTD, -1,
446 c902213d 2022-10-29 thomas &iclient, sizeof(iclient)) == -1) {
447 c902213d 2022-10-29 thomas err = got_error_from_errno("imsg compose INFO_CLIENT");
449 c902213d 2022-10-29 thomas return err;
452 c902213d 2022-10-29 thomas return NULL;
455 c902213d 2022-10-29 thomas static const struct got_error *
456 c902213d 2022-10-29 thomas send_info(struct gotd_client *client)
458 c902213d 2022-10-29 thomas const struct got_error *err = NULL;
459 c902213d 2022-10-29 thomas struct gotd_imsg_info info;
460 c902213d 2022-10-29 thomas uint64_t slot;
461 c902213d 2022-10-29 thomas struct gotd_repo *repo;
463 c8cf6821 2023-01-06 thomas if (client->euid != 0)
464 c8cf6821 2023-01-06 thomas return got_error_set_errno(EPERM, "info");
466 c902213d 2022-10-29 thomas info.pid = gotd.pid;
467 c902213d 2022-10-29 thomas info.verbosity = gotd.verbosity;
468 c902213d 2022-10-29 thomas info.nrepos = gotd.nrepos;
469 c902213d 2022-10-29 thomas info.nclients = client_cnt - 1;
471 c902213d 2022-10-29 thomas if (gotd_imsg_compose_event(&client->iev, GOTD_IMSG_INFO, PROC_GOTD, -1,
472 c902213d 2022-10-29 thomas &info, sizeof(info)) == -1) {
473 c902213d 2022-10-29 thomas err = got_error_from_errno("imsg compose INFO");
475 c902213d 2022-10-29 thomas return err;
478 c902213d 2022-10-29 thomas TAILQ_FOREACH(repo, &gotd.repos, entry) {
479 c902213d 2022-10-29 thomas err = send_repo_info(&client->iev, repo);
481 c902213d 2022-10-29 thomas return err;
484 c902213d 2022-10-29 thomas for (slot = 0; slot < nitems(gotd_clients); slot++) {
485 c902213d 2022-10-29 thomas struct gotd_client *c;
486 c902213d 2022-10-29 thomas STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
487 c902213d 2022-10-29 thomas if (c->id == client->id)
488 c902213d 2022-10-29 thomas continue;
489 c902213d 2022-10-29 thomas err = send_client_info(&client->iev, c);
491 c902213d 2022-10-29 thomas return err;
495 c902213d 2022-10-29 thomas return NULL;
498 c902213d 2022-10-29 thomas static const struct got_error *
499 c902213d 2022-10-29 thomas stop_gotd(struct gotd_client *client)
502 c902213d 2022-10-29 thomas if (client->euid != 0)
503 c902213d 2022-10-29 thomas return got_error_set_errno(EPERM, "stop");
505 c902213d 2022-10-29 thomas gotd_shutdown();
506 c902213d 2022-10-29 thomas /* NOTREACHED */
507 729a7e24 2022-11-17 thomas return NULL;
510 3efd8e31 2022-10-23 thomas static const struct got_error *
511 62ee7d94 2023-01-10 thomas start_client_authentication(struct gotd_client *client, struct imsg *imsg)
513 3efd8e31 2022-10-23 thomas const struct got_error *err;
514 3efd8e31 2022-10-23 thomas struct gotd_imsg_list_refs ireq;
515 729a7e24 2022-11-17 thomas struct gotd_repo *repo = NULL;
516 3efd8e31 2022-10-23 thomas size_t datalen;
518 3efd8e31 2022-10-23 thomas log_debug("list-refs request from uid %d", client->euid);
520 7b1db75e 2023-01-14 thomas if (client->state != GOTD_CLIENT_STATE_NEW)
521 62ee7d94 2023-01-10 thomas return got_error_msg(GOT_ERR_BAD_REQUEST,
522 62ee7d94 2023-01-10 thomas "unexpected list-refs request received");
524 3efd8e31 2022-10-23 thomas datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
525 3efd8e31 2022-10-23 thomas if (datalen != sizeof(ireq))
526 3efd8e31 2022-10-23 thomas return got_error(GOT_ERR_PRIVSEP_LEN);
528 3efd8e31 2022-10-23 thomas memcpy(&ireq, imsg->data, datalen);
530 3efd8e31 2022-10-23 thomas if (ireq.client_is_reading) {
531 3efd8e31 2022-10-23 thomas err = ensure_client_is_not_writing(client);
533 3efd8e31 2022-10-23 thomas return err;
534 5dcb3a43 2023-04-01 thomas repo = gotd_find_repo_by_name(ireq.repo_name, &gotd);
535 729a7e24 2022-11-17 thomas if (repo == NULL)
536 729a7e24 2022-11-17 thomas return got_error(GOT_ERR_NOT_GIT_REPO);
537 c669c489 2022-12-30 thomas err = start_auth_child(client, GOTD_AUTH_READ, repo,
538 85b37c72 2022-12-30 thomas gotd.argv0, gotd.confpath, gotd.daemonize,
539 85b37c72 2022-12-30 thomas gotd.verbosity);
541 85b37c72 2022-12-30 thomas return err;
543 3efd8e31 2022-10-23 thomas err = ensure_client_is_not_reading(client);
545 729a7e24 2022-11-17 thomas return err;
546 5dcb3a43 2023-04-01 thomas repo = gotd_find_repo_by_name(ireq.repo_name, &gotd);
547 729a7e24 2022-11-17 thomas if (repo == NULL)
548 729a7e24 2022-11-17 thomas return got_error(GOT_ERR_NOT_GIT_REPO);
549 c669c489 2022-12-30 thomas err = start_auth_child(client,
550 c669c489 2022-12-30 thomas GOTD_AUTH_READ | GOTD_AUTH_WRITE,
551 c669c489 2022-12-30 thomas repo, gotd.argv0, gotd.confpath, gotd.daemonize,
552 85b37c72 2022-12-30 thomas gotd.verbosity);
554 85b37c72 2022-12-30 thomas return err;
557 62ee7d94 2023-01-10 thomas evtimer_add(&client->tmo, &auth_timeout);
559 f7abcac2 2023-07-17 thomas /* Flow continues upon authentication success/failure or timeout. */
560 3efd8e31 2022-10-23 thomas return NULL;
563 3efd8e31 2022-10-23 thomas static void
564 3efd8e31 2022-10-23 thomas gotd_request(int fd, short events, void *arg)
566 3efd8e31 2022-10-23 thomas struct gotd_imsgev *iev = arg;
567 3efd8e31 2022-10-23 thomas struct imsgbuf *ibuf = &iev->ibuf;
568 3efd8e31 2022-10-23 thomas struct gotd_client *client = iev->handler_arg;
569 3efd8e31 2022-10-23 thomas const struct got_error *err = NULL;
570 3efd8e31 2022-10-23 thomas struct imsg imsg;
571 3efd8e31 2022-10-23 thomas ssize_t n;
573 3efd8e31 2022-10-23 thomas if (events & EV_WRITE) {
574 3efd8e31 2022-10-23 thomas while (ibuf->w.queued) {
575 3efd8e31 2022-10-23 thomas n = msgbuf_write(&ibuf->w);
576 3efd8e31 2022-10-23 thomas if (n == -1 && errno == EPIPE) {
578 3efd8e31 2022-10-23 thomas * The client has closed its socket.
579 3efd8e31 2022-10-23 thomas * This can happen when Git clients are
580 3efd8e31 2022-10-23 thomas * done sending pack file data.
582 3efd8e31 2022-10-23 thomas msgbuf_clear(&ibuf->w);
583 3efd8e31 2022-10-23 thomas continue;
584 3efd8e31 2022-10-23 thomas } else if (n == -1 && errno != EAGAIN) {
585 3efd8e31 2022-10-23 thomas err = got_error_from_errno("imsg_flush");
586 3efd8e31 2022-10-23 thomas disconnect_on_error(client, err);
589 3efd8e31 2022-10-23 thomas if (n == 0) {
590 3efd8e31 2022-10-23 thomas /* Connection closed. */
591 3efd8e31 2022-10-23 thomas err = got_error(GOT_ERR_EOF);
592 3efd8e31 2022-10-23 thomas disconnect_on_error(client, err);
597 c902213d 2022-10-29 thomas /* Disconnect gotctl(8) now that messages have been sent. */
598 c902213d 2022-10-29 thomas if (!client_is_reading(client) && !client_is_writing(client)) {
599 c902213d 2022-10-29 thomas disconnect(client);
604 3efd8e31 2022-10-23 thomas if ((events & EV_READ) == 0)
607 3efd8e31 2022-10-23 thomas memset(&imsg, 0, sizeof(imsg));
609 3efd8e31 2022-10-23 thomas while (err == NULL) {
610 3efd8e31 2022-10-23 thomas err = gotd_imsg_recv(&imsg, ibuf, 0);
611 3efd8e31 2022-10-23 thomas if (err) {
612 3efd8e31 2022-10-23 thomas if (err->code == GOT_ERR_PRIVSEP_READ)
613 3efd8e31 2022-10-23 thomas err = NULL;
617 3efd8e31 2022-10-23 thomas evtimer_del(&client->tmo);
619 3efd8e31 2022-10-23 thomas switch (imsg.hdr.type) {
620 c902213d 2022-10-29 thomas case GOTD_IMSG_INFO:
621 c902213d 2022-10-29 thomas err = send_info(client);
623 c902213d 2022-10-29 thomas case GOTD_IMSG_STOP:
624 c902213d 2022-10-29 thomas err = stop_gotd(client);
626 3efd8e31 2022-10-23 thomas case GOTD_IMSG_LIST_REFS:
627 62ee7d94 2023-01-10 thomas err = start_client_authentication(client, &imsg);
630 62ee7d94 2023-01-10 thomas log_debug("unexpected imsg %d", imsg.hdr.type);
631 3efd8e31 2022-10-23 thomas err = got_error(GOT_ERR_PRIVSEP_MSG);
635 3efd8e31 2022-10-23 thomas imsg_free(&imsg);
638 3efd8e31 2022-10-23 thomas if (err) {
639 f5f71a04 2023-01-23 thomas disconnect_on_error(client, err);
641 3efd8e31 2022-10-23 thomas gotd_imsg_event_add(&client->iev);
645 3efd8e31 2022-10-23 thomas static void
646 62ee7d94 2023-01-10 thomas gotd_auth_timeout(int fd, short events, void *arg)
648 3efd8e31 2022-10-23 thomas struct gotd_client *client = arg;
650 62ee7d94 2023-01-10 thomas log_debug("disconnecting uid %d due to authentication timeout",
651 62ee7d94 2023-01-10 thomas client->euid);
652 3efd8e31 2022-10-23 thomas disconnect(client);
655 2b3d32a1 2022-12-30 thomas static const struct got_error *
656 2b3d32a1 2022-12-30 thomas recv_connect(uint32_t *client_id, struct imsg *imsg)
658 2b3d32a1 2022-12-30 thomas const struct got_error *err = NULL;
659 2b3d32a1 2022-12-30 thomas struct gotd_imsg_connect iconnect;
660 2b3d32a1 2022-12-30 thomas size_t datalen;
661 3efd8e31 2022-10-23 thomas int s = -1;
662 3efd8e31 2022-10-23 thomas struct gotd_client *client = NULL;
664 2b3d32a1 2022-12-30 thomas *client_id = 0;
666 2b3d32a1 2022-12-30 thomas datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
667 2b3d32a1 2022-12-30 thomas if (datalen != sizeof(iconnect))
668 2b3d32a1 2022-12-30 thomas return got_error(GOT_ERR_PRIVSEP_LEN);
669 2b3d32a1 2022-12-30 thomas memcpy(&iconnect, imsg->data, sizeof(iconnect));
671 2b3d32a1 2022-12-30 thomas s = imsg->fd;
672 3efd8e31 2022-10-23 thomas if (s == -1) {
673 2b3d32a1 2022-12-30 thomas err = got_error(GOT_ERR_PRIVSEP_NO_FD);
674 2b3d32a1 2022-12-30 thomas goto done;
677 2b3d32a1 2022-12-30 thomas if (find_client(iconnect.client_id)) {
678 2b3d32a1 2022-12-30 thomas err = got_error_msg(GOT_ERR_CLIENT_ID, "duplicate client ID");
679 2b3d32a1 2022-12-30 thomas goto done;
682 3efd8e31 2022-10-23 thomas client = calloc(1, sizeof(*client));
683 3efd8e31 2022-10-23 thomas if (client == NULL) {
684 2b3d32a1 2022-12-30 thomas err = got_error_from_errno("calloc");
685 2b3d32a1 2022-12-30 thomas goto done;
688 2b3d32a1 2022-12-30 thomas *client_id = iconnect.client_id;
690 7b1db75e 2023-01-14 thomas client->state = GOTD_CLIENT_STATE_NEW;
691 2b3d32a1 2022-12-30 thomas client->id = iconnect.client_id;
692 3efd8e31 2022-10-23 thomas client->fd = s;
694 0bcde4c8 2022-12-30 thomas /* The auth process will verify UID/GID for us. */
695 0bcde4c8 2022-12-30 thomas client->euid = iconnect.euid;
696 0bcde4c8 2022-12-30 thomas client->egid = iconnect.egid;
698 3efd8e31 2022-10-23 thomas imsg_init(&client->iev.ibuf, client->fd);
699 3efd8e31 2022-10-23 thomas client->iev.handler = gotd_request;
700 3efd8e31 2022-10-23 thomas client->iev.events = EV_READ;
701 3efd8e31 2022-10-23 thomas client->iev.handler_arg = client;
703 3efd8e31 2022-10-23 thomas event_set(&client->iev.ev, client->fd, EV_READ, gotd_request,
704 3efd8e31 2022-10-23 thomas &client->iev);
705 3efd8e31 2022-10-23 thomas gotd_imsg_event_add(&client->iev);
707 62ee7d94 2023-01-10 thomas evtimer_set(&client->tmo, gotd_auth_timeout, client);
709 3efd8e31 2022-10-23 thomas add_client(client);
710 3efd8e31 2022-10-23 thomas log_debug("%s: new client uid %d connected on fd %d", __func__,
711 3efd8e31 2022-10-23 thomas client->euid, client->fd);
713 2b3d32a1 2022-12-30 thomas if (err) {
714 78943464 2023-06-22 thomas struct gotd_child_proc *listen_proc = gotd.listen_proc;
715 2b3d32a1 2022-12-30 thomas struct gotd_imsg_disconnect idisconnect;
717 2b3d32a1 2022-12-30 thomas idisconnect.client_id = client->id;
718 2b3d32a1 2022-12-30 thomas if (gotd_imsg_compose_event(&listen_proc->iev,
719 2b3d32a1 2022-12-30 thomas GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
720 2b3d32a1 2022-12-30 thomas &idisconnect, sizeof(idisconnect)) == -1)
721 2b3d32a1 2022-12-30 thomas log_warn("imsg compose DISCONNECT");
723 2b3d32a1 2022-12-30 thomas if (s != -1)
724 2b3d32a1 2022-12-30 thomas close(s);
727 2b3d32a1 2022-12-30 thomas return err;
730 3efd8e31 2022-10-23 thomas static const char *gotd_proc_names[PROC_MAX] = {
731 3efd8e31 2022-10-23 thomas "parent",
732 2b3d32a1 2022-12-30 thomas "listen",
734 844dda16 2023-06-22 thomas "session_read",
735 844dda16 2023-06-22 thomas "session_write",
736 3efd8e31 2022-10-23 thomas "repo_read",
737 f3807fe5 2023-07-10 thomas "repo_write",
738 f3807fe5 2023-07-10 thomas "gitwrapper"
741 3efd8e31 2022-10-23 thomas static void
742 3efd8e31 2022-10-23 thomas kill_proc(struct gotd_child_proc *proc, int fatal)
744 2c8fb90b 2023-06-25 thomas struct timeval tv = { 5, 0 };
746 2c8fb90b 2023-06-25 thomas log_debug("kill -%d %d", fatal ? SIGKILL : SIGTERM, proc->pid);
748 2c8fb90b 2023-06-25 thomas if (proc->iev.ibuf.fd != -1) {
749 2c8fb90b 2023-06-25 thomas event_del(&proc->iev.ev);
750 2c8fb90b 2023-06-25 thomas msgbuf_clear(&proc->iev.ibuf.w);
751 2c8fb90b 2023-06-25 thomas close(proc->iev.ibuf.fd);
752 2c8fb90b 2023-06-25 thomas proc->iev.ibuf.fd = -1;
755 2c8fb90b 2023-06-25 thomas if (!evtimer_pending(&proc->tmo, NULL) && !fatal)
756 2c8fb90b 2023-06-25 thomas evtimer_add(&proc->tmo, &tv);
758 3efd8e31 2022-10-23 thomas if (fatal) {
759 3efd8e31 2022-10-23 thomas log_warnx("sending SIGKILL to PID %d", proc->pid);
760 3efd8e31 2022-10-23 thomas kill(proc->pid, SIGKILL);
762 3efd8e31 2022-10-23 thomas kill(proc->pid, SIGTERM);
765 3efd8e31 2022-10-23 thomas static void
766 2c8fb90b 2023-06-25 thomas kill_proc_timeout(int fd, short ev, void *d)
768 2c8fb90b 2023-06-25 thomas struct gotd_child_proc *proc = d;
770 2c8fb90b 2023-06-25 thomas log_warnx("timeout waiting for PID %d to terminate;"
771 2c8fb90b 2023-06-25 thomas " retrying with force", proc->pid);
772 2c8fb90b 2023-06-25 thomas kill_proc(proc, 1);
775 2c8fb90b 2023-06-25 thomas static void
776 3efd8e31 2022-10-23 thomas gotd_shutdown(void)
778 85b37c72 2022-12-30 thomas uint64_t slot;
780 62ee7d94 2023-01-10 thomas log_debug("shutting down");
781 85b37c72 2022-12-30 thomas for (slot = 0; slot < nitems(gotd_clients); slot++) {
782 85b37c72 2022-12-30 thomas struct gotd_client *c, *tmp;
784 85b37c72 2022-12-30 thomas STAILQ_FOREACH_SAFE(c, &gotd_clients[slot], entry, tmp)
785 85b37c72 2022-12-30 thomas disconnect(c);
788 2c8fb90b 2023-06-25 thomas kill_proc(gotd.listen_proc, 0);
790 3efd8e31 2022-10-23 thomas log_info("terminating");
794 2c8fb90b 2023-06-25 thomas static struct gotd_child_proc *
795 2c8fb90b 2023-06-25 thomas find_proc_by_pid(pid_t pid)
797 2c8fb90b 2023-06-25 thomas struct gotd_child_proc *proc = NULL;
799 2c8fb90b 2023-06-25 thomas TAILQ_FOREACH(proc, &procs, entry)
800 2c8fb90b 2023-06-25 thomas if (proc->pid == pid)
803 2c8fb90b 2023-06-25 thomas return proc;
807 3efd8e31 2022-10-23 thomas gotd_sighdlr(int sig, short event, void *arg)
809 2c8fb90b 2023-06-25 thomas struct gotd_child_proc *proc;
810 2c8fb90b 2023-06-25 thomas pid_t pid;
811 2c8fb90b 2023-06-25 thomas int status;
814 3efd8e31 2022-10-23 thomas * Normal signal handler rules don't apply because libevent
815 3efd8e31 2022-10-23 thomas * decouples for us.
818 3efd8e31 2022-10-23 thomas switch (sig) {
819 3efd8e31 2022-10-23 thomas case SIGHUP:
820 3efd8e31 2022-10-23 thomas log_info("%s: ignoring SIGHUP", __func__);
822 3efd8e31 2022-10-23 thomas case SIGUSR1:
823 3efd8e31 2022-10-23 thomas log_info("%s: ignoring SIGUSR1", __func__);
825 3efd8e31 2022-10-23 thomas case SIGTERM:
826 3efd8e31 2022-10-23 thomas case SIGINT:
827 3efd8e31 2022-10-23 thomas gotd_shutdown();
829 2c8fb90b 2023-06-25 thomas case SIGCHLD:
830 2c8fb90b 2023-06-25 thomas for (;;) {
831 2c8fb90b 2023-06-25 thomas pid = waitpid(WAIT_ANY, &status, WNOHANG);
832 2c8fb90b 2023-06-25 thomas if (pid == -1) {
833 2c8fb90b 2023-06-25 thomas if (errno == EINTR)
834 2c8fb90b 2023-06-25 thomas continue;
835 2c8fb90b 2023-06-25 thomas if (errno == ECHILD)
837 2c8fb90b 2023-06-25 thomas fatal("waitpid");
839 2c8fb90b 2023-06-25 thomas if (pid == 0)
842 2c8fb90b 2023-06-25 thomas log_debug("reaped pid %d", pid);
843 2c8fb90b 2023-06-25 thomas proc = find_proc_by_pid(pid);
844 2c8fb90b 2023-06-25 thomas if (proc == NULL) {
845 2c8fb90b 2023-06-25 thomas log_info("caught exit of unknown child %d",
847 2c8fb90b 2023-06-25 thomas continue;
850 2c8fb90b 2023-06-25 thomas if (WIFSIGNALED(status)) {
851 2c8fb90b 2023-06-25 thomas log_warnx("child PID %d terminated with"
852 2c8fb90b 2023-06-25 thomas " signal %d", pid, WTERMSIG(status));
855 2c8fb90b 2023-06-25 thomas proc_done(proc);
859 3efd8e31 2022-10-23 thomas fatalx("unexpected signal");
863 3efd8e31 2022-10-23 thomas static const struct got_error *
864 3efd8e31 2022-10-23 thomas ensure_proc_is_reading(struct gotd_client *client,
865 3efd8e31 2022-10-23 thomas struct gotd_child_proc *proc)
867 3efd8e31 2022-10-23 thomas if (!client_is_reading(client)) {
868 3efd8e31 2022-10-23 thomas kill_proc(proc, 1);
869 3efd8e31 2022-10-23 thomas return got_error_fmt(GOT_ERR_BAD_PACKET,
870 3efd8e31 2022-10-23 thomas "PID %d handled a read-request for uid %d but this "
871 3efd8e31 2022-10-23 thomas "user is not reading from a repository", proc->pid,
872 3efd8e31 2022-10-23 thomas client->euid);
875 3efd8e31 2022-10-23 thomas return NULL;
878 3efd8e31 2022-10-23 thomas static const struct got_error *
879 3efd8e31 2022-10-23 thomas ensure_proc_is_writing(struct gotd_client *client,
880 3efd8e31 2022-10-23 thomas struct gotd_child_proc *proc)
882 3efd8e31 2022-10-23 thomas if (!client_is_writing(client)) {
883 3efd8e31 2022-10-23 thomas kill_proc(proc, 1);
884 3efd8e31 2022-10-23 thomas return got_error_fmt(GOT_ERR_BAD_PACKET,
885 3efd8e31 2022-10-23 thomas "PID %d handled a write-request for uid %d but this "
886 3efd8e31 2022-10-23 thomas "user is not writing to a repository", proc->pid,
887 3efd8e31 2022-10-23 thomas client->euid);
890 3efd8e31 2022-10-23 thomas return NULL;
893 3efd8e31 2022-10-23 thomas static int
894 3efd8e31 2022-10-23 thomas verify_imsg_src(struct gotd_client *client, struct gotd_child_proc *proc,
895 3efd8e31 2022-10-23 thomas struct imsg *imsg)
897 3efd8e31 2022-10-23 thomas const struct got_error *err;
898 3efd8e31 2022-10-23 thomas int ret = 0;
900 2b3d32a1 2022-12-30 thomas if (proc->type == PROC_REPO_READ || proc->type == PROC_REPO_WRITE) {
901 27b11d77 2023-01-14 thomas if (client->repo == NULL)
902 2b3d32a1 2022-12-30 thomas fatalx("no process found for uid %d", client->euid);
903 27b11d77 2023-01-14 thomas if (proc->pid != client->repo->pid) {
904 2b3d32a1 2022-12-30 thomas kill_proc(proc, 1);
905 2b3d32a1 2022-12-30 thomas log_warnx("received message from PID %d for uid %d, "
906 2b3d32a1 2022-12-30 thomas "while PID %d is the process serving this user",
907 27b11d77 2023-01-14 thomas proc->pid, client->euid, client->repo->pid);
908 2b3d32a1 2022-12-30 thomas return 0;
911 7fed8fa4 2023-06-22 thomas if (proc->type == PROC_SESSION_READ ||
912 7fed8fa4 2023-06-22 thomas proc->type == PROC_SESSION_WRITE) {
913 62ee7d94 2023-01-10 thomas if (client->session == NULL) {
914 62ee7d94 2023-01-10 thomas log_warnx("no session found for uid %d", client->euid);
915 62ee7d94 2023-01-10 thomas return 0;
917 62ee7d94 2023-01-10 thomas if (proc->pid != client->session->pid) {
918 62ee7d94 2023-01-10 thomas kill_proc(proc, 1);
919 62ee7d94 2023-01-10 thomas log_warnx("received message from PID %d for uid %d, "
920 62ee7d94 2023-01-10 thomas "while PID %d is the process serving this user",
921 62ee7d94 2023-01-10 thomas proc->pid, client->euid, client->session->pid);
922 62ee7d94 2023-01-10 thomas return 0;
926 3efd8e31 2022-10-23 thomas switch (imsg->hdr.type) {
927 3efd8e31 2022-10-23 thomas case GOTD_IMSG_ERROR:
930 2b3d32a1 2022-12-30 thomas case GOTD_IMSG_CONNECT:
931 2b3d32a1 2022-12-30 thomas if (proc->type != PROC_LISTEN) {
932 2b3d32a1 2022-12-30 thomas err = got_error_fmt(GOT_ERR_BAD_PACKET,
933 2b3d32a1 2022-12-30 thomas "new connection for uid %d from PID %d "
934 2b3d32a1 2022-12-30 thomas "which is not the listen process",
935 c669c489 2022-12-30 thomas proc->pid, client->euid);
939 c669c489 2022-12-30 thomas case GOTD_IMSG_ACCESS_GRANTED:
940 c669c489 2022-12-30 thomas if (proc->type != PROC_AUTH) {
941 c669c489 2022-12-30 thomas err = got_error_fmt(GOT_ERR_BAD_PACKET,
942 c669c489 2022-12-30 thomas "authentication of uid %d from PID %d "
943 c669c489 2022-12-30 thomas "which is not the auth process",
944 2b3d32a1 2022-12-30 thomas proc->pid, client->euid);
948 62ee7d94 2023-01-10 thomas case GOTD_IMSG_CLIENT_SESSION_READY:
949 7fed8fa4 2023-06-22 thomas if (proc->type != PROC_SESSION_READ &&
950 7fed8fa4 2023-06-22 thomas proc->type != PROC_SESSION_WRITE) {
951 62ee7d94 2023-01-10 thomas err = got_error_fmt(GOT_ERR_BAD_PACKET,
952 62ee7d94 2023-01-10 thomas "unexpected \"ready\" signal from PID %d",
953 62ee7d94 2023-01-10 thomas proc->pid);
957 85b37c72 2022-12-30 thomas case GOTD_IMSG_REPO_CHILD_READY:
958 85b37c72 2022-12-30 thomas if (proc->type != PROC_REPO_READ &&
959 85b37c72 2022-12-30 thomas proc->type != PROC_REPO_WRITE) {
960 85b37c72 2022-12-30 thomas err = got_error_fmt(GOT_ERR_BAD_PACKET,
961 85b37c72 2022-12-30 thomas "unexpected \"ready\" signal from PID %d",
962 85b37c72 2022-12-30 thomas proc->pid);
966 3efd8e31 2022-10-23 thomas case GOTD_IMSG_PACKFILE_DONE:
967 3efd8e31 2022-10-23 thomas err = ensure_proc_is_reading(client, proc);
969 3efd8e31 2022-10-23 thomas log_warnx("uid %d: %s", client->euid, err->msg);
973 3efd8e31 2022-10-23 thomas case GOTD_IMSG_PACKFILE_INSTALL:
974 3efd8e31 2022-10-23 thomas case GOTD_IMSG_REF_UPDATES_START:
975 3efd8e31 2022-10-23 thomas case GOTD_IMSG_REF_UPDATE:
976 3efd8e31 2022-10-23 thomas err = ensure_proc_is_writing(client, proc);
978 3efd8e31 2022-10-23 thomas log_warnx("uid %d: %s", client->euid, err->msg);
983 3efd8e31 2022-10-23 thomas log_debug("%s: unexpected imsg %d", __func__, imsg->hdr.type);
987 3efd8e31 2022-10-23 thomas return ret;
990 3efd8e31 2022-10-23 thomas static const struct got_error *
991 62ee7d94 2023-01-10 thomas connect_repo_child(struct gotd_client *client,
992 62ee7d94 2023-01-10 thomas struct gotd_child_proc *repo_proc)
994 85b37c72 2022-12-30 thomas static const struct got_error *err;
995 62ee7d94 2023-01-10 thomas struct gotd_imsgev *session_iev = &client->session->iev;
996 62ee7d94 2023-01-10 thomas struct gotd_imsg_connect_repo_child ireq;
997 62ee7d94 2023-01-10 thomas int pipe[2];
998 621b8de0 2023-08-23 thomas int sock_flags = SOCK_STREAM | SOCK_NONBLOCK;
1000 621b8de0 2023-08-23 thomas #ifdef SOCK_CLOEXEC
1001 621b8de0 2023-08-23 thomas sock_flags |= SOCK_CLOEXEC;
1004 7b1db75e 2023-01-14 thomas if (client->state != GOTD_CLIENT_STATE_ACCESS_GRANTED)
1005 62ee7d94 2023-01-10 thomas return got_error_msg(GOT_ERR_BAD_REQUEST,
1006 62ee7d94 2023-01-10 thomas "unexpected repo child ready signal received");
1008 621b8de0 2023-08-23 thomas if (socketpair(AF_UNIX, sock_flags, PF_UNSPEC, pipe) == -1)
1009 62ee7d94 2023-01-10 thomas fatal("socketpair");
1011 62ee7d94 2023-01-10 thomas memset(&ireq, 0, sizeof(ireq));
1012 62ee7d94 2023-01-10 thomas ireq.client_id = client->id;
1013 62ee7d94 2023-01-10 thomas ireq.proc_id = repo_proc->type;
1015 62ee7d94 2023-01-10 thomas /* Pass repo child pipe to session child process. */
1016 62ee7d94 2023-01-10 thomas if (gotd_imsg_compose_event(session_iev, GOTD_IMSG_CONNECT_REPO_CHILD,
1017 62ee7d94 2023-01-10 thomas PROC_GOTD, pipe[0], &ireq, sizeof(ireq)) == -1) {
1018 62ee7d94 2023-01-10 thomas err = got_error_from_errno("imsg compose CONNECT_REPO_CHILD");
1019 62ee7d94 2023-01-10 thomas close(pipe[0]);
1020 62ee7d94 2023-01-10 thomas close(pipe[1]);
1021 62ee7d94 2023-01-10 thomas return err;
1024 62ee7d94 2023-01-10 thomas /* Pass session child pipe to repo child process. */
1025 62ee7d94 2023-01-10 thomas if (gotd_imsg_compose_event(&repo_proc->iev,
1026 62ee7d94 2023-01-10 thomas GOTD_IMSG_CONNECT_REPO_CHILD, PROC_GOTD, pipe[1], NULL, 0) == -1) {
1027 62ee7d94 2023-01-10 thomas err = got_error_from_errno("imsg compose CONNECT_REPO_CHILD");
1028 62ee7d94 2023-01-10 thomas close(pipe[1]);
1029 62ee7d94 2023-01-10 thomas return err;
1032 3efd8e31 2022-10-23 thomas return NULL;
1035 3efd8e31 2022-10-23 thomas static void
1036 85b37c72 2022-12-30 thomas gotd_dispatch_listener(int fd, short event, void *arg)
1038 3efd8e31 2022-10-23 thomas struct gotd_imsgev *iev = arg;
1039 3efd8e31 2022-10-23 thomas struct imsgbuf *ibuf = &iev->ibuf;
1040 78943464 2023-06-22 thomas struct gotd_child_proc *proc = gotd.listen_proc;
1041 85b37c72 2022-12-30 thomas ssize_t n;
1042 85b37c72 2022-12-30 thomas int shut = 0;
1043 85b37c72 2022-12-30 thomas struct imsg imsg;
1045 85b37c72 2022-12-30 thomas if (proc->iev.ibuf.fd != fd)
1046 85b37c72 2022-12-30 thomas fatalx("%s: unexpected fd %d", __func__, fd);
1048 85b37c72 2022-12-30 thomas if (event & EV_READ) {
1049 85b37c72 2022-12-30 thomas if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1050 85b37c72 2022-12-30 thomas fatal("imsg_read error");
1051 85b37c72 2022-12-30 thomas if (n == 0) {
1052 85b37c72 2022-12-30 thomas /* Connection closed. */
1053 85b37c72 2022-12-30 thomas shut = 1;
1054 85b37c72 2022-12-30 thomas goto done;
1058 85b37c72 2022-12-30 thomas if (event & EV_WRITE) {
1059 85b37c72 2022-12-30 thomas n = msgbuf_write(&ibuf->w);
1060 85b37c72 2022-12-30 thomas if (n == -1 && errno != EAGAIN)
1061 85b37c72 2022-12-30 thomas fatal("msgbuf_write");
1062 85b37c72 2022-12-30 thomas if (n == 0) {
1063 85b37c72 2022-12-30 thomas /* Connection closed. */
1064 85b37c72 2022-12-30 thomas shut = 1;
1065 85b37c72 2022-12-30 thomas goto done;
1069 85b37c72 2022-12-30 thomas for (;;) {
1070 85b37c72 2022-12-30 thomas const struct got_error *err = NULL;
1071 85b37c72 2022-12-30 thomas struct gotd_client *client = NULL;
1072 85b37c72 2022-12-30 thomas uint32_t client_id = 0;
1073 85b37c72 2022-12-30 thomas int do_disconnect = 0;
1075 85b37c72 2022-12-30 thomas if ((n = imsg_get(ibuf, &imsg)) == -1)
1076 85b37c72 2022-12-30 thomas fatal("%s: imsg_get error", __func__);
1077 85b37c72 2022-12-30 thomas if (n == 0) /* No more messages. */
1080 85b37c72 2022-12-30 thomas switch (imsg.hdr.type) {
1081 85b37c72 2022-12-30 thomas case GOTD_IMSG_ERROR:
1082 85b37c72 2022-12-30 thomas do_disconnect = 1;
1083 85b37c72 2022-12-30 thomas err = gotd_imsg_recv_error(&client_id, &imsg);
1085 85b37c72 2022-12-30 thomas case GOTD_IMSG_CONNECT:
1086 85b37c72 2022-12-30 thomas err = recv_connect(&client_id, &imsg);
1088 85b37c72 2022-12-30 thomas default:
1089 85b37c72 2022-12-30 thomas log_debug("unexpected imsg %d", imsg.hdr.type);
1093 85b37c72 2022-12-30 thomas client = find_client(client_id);
1094 85b37c72 2022-12-30 thomas if (client == NULL) {
1095 85b37c72 2022-12-30 thomas log_warnx("%s: client not found", __func__);
1096 85b37c72 2022-12-30 thomas imsg_free(&imsg);
1097 85b37c72 2022-12-30 thomas continue;
1100 85b37c72 2022-12-30 thomas if (err)
1101 85b37c72 2022-12-30 thomas log_warnx("uid %d: %s", client->euid, err->msg);
1103 85b37c72 2022-12-30 thomas if (do_disconnect) {
1104 85b37c72 2022-12-30 thomas if (err)
1105 85b37c72 2022-12-30 thomas disconnect_on_error(client, err);
1107 85b37c72 2022-12-30 thomas disconnect(client);
1110 85b37c72 2022-12-30 thomas imsg_free(&imsg);
1113 85b37c72 2022-12-30 thomas if (!shut) {
1114 85b37c72 2022-12-30 thomas gotd_imsg_event_add(iev);
1115 85b37c72 2022-12-30 thomas } else {
1116 85b37c72 2022-12-30 thomas /* This pipe is dead. Remove its event handler */
1117 85b37c72 2022-12-30 thomas event_del(&iev->ev);
1118 85b37c72 2022-12-30 thomas event_loopexit(NULL);
1122 85b37c72 2022-12-30 thomas static void
1123 c669c489 2022-12-30 thomas gotd_dispatch_auth_child(int fd, short event, void *arg)
1125 c669c489 2022-12-30 thomas const struct got_error *err = NULL;
1126 c669c489 2022-12-30 thomas struct gotd_imsgev *iev = arg;
1127 c669c489 2022-12-30 thomas struct imsgbuf *ibuf = &iev->ibuf;
1128 c669c489 2022-12-30 thomas struct gotd_client *client;
1129 c669c489 2022-12-30 thomas struct gotd_repo *repo = NULL;
1130 c669c489 2022-12-30 thomas ssize_t n;
1131 c669c489 2022-12-30 thomas int shut = 0;
1132 c669c489 2022-12-30 thomas struct imsg imsg;
1133 c669c489 2022-12-30 thomas uint32_t client_id = 0;
1134 c669c489 2022-12-30 thomas int do_disconnect = 0;
1136 c669c489 2022-12-30 thomas client = find_client_by_proc_fd(fd);
1137 b7acbe65 2023-02-17 thomas if (client == NULL) {
1138 b7acbe65 2023-02-17 thomas /* Can happen during process teardown. */
1139 b7acbe65 2023-02-17 thomas warnx("cannot find client for fd %d", fd);
1140 b7acbe65 2023-02-17 thomas shut = 1;
1141 b7acbe65 2023-02-17 thomas goto done;
1144 c669c489 2022-12-30 thomas if (client->auth == NULL)
1145 c669c489 2022-12-30 thomas fatalx("cannot find auth child process for fd %d", fd);
1147 c669c489 2022-12-30 thomas if (event & EV_READ) {
1148 c669c489 2022-12-30 thomas if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1149 c669c489 2022-12-30 thomas fatal("imsg_read error");
1150 c669c489 2022-12-30 thomas if (n == 0) {
1151 c669c489 2022-12-30 thomas /* Connection closed. */
1152 c669c489 2022-12-30 thomas shut = 1;
1153 c669c489 2022-12-30 thomas goto done;
1157 c669c489 2022-12-30 thomas if (event & EV_WRITE) {
1158 c669c489 2022-12-30 thomas n = msgbuf_write(&ibuf->w);
1159 c669c489 2022-12-30 thomas if (n == -1 && errno != EAGAIN)
1160 c669c489 2022-12-30 thomas fatal("msgbuf_write");
1161 c669c489 2022-12-30 thomas if (n == 0) {
1162 c669c489 2022-12-30 thomas /* Connection closed. */
1163 c669c489 2022-12-30 thomas shut = 1;
1165 c669c489 2022-12-30 thomas goto done;
1168 c669c489 2022-12-30 thomas if (client->auth->iev.ibuf.fd != fd)
1169 c669c489 2022-12-30 thomas fatalx("%s: unexpected fd %d", __func__, fd);
1171 c669c489 2022-12-30 thomas if ((n = imsg_get(ibuf, &imsg)) == -1)
1172 c669c489 2022-12-30 thomas fatal("%s: imsg_get error", __func__);
1173 c669c489 2022-12-30 thomas if (n == 0) /* No more messages. */
1176 c669c489 2022-12-30 thomas evtimer_del(&client->tmo);
1178 c669c489 2022-12-30 thomas switch (imsg.hdr.type) {
1179 c669c489 2022-12-30 thomas case GOTD_IMSG_ERROR:
1180 c669c489 2022-12-30 thomas do_disconnect = 1;
1181 c669c489 2022-12-30 thomas err = gotd_imsg_recv_error(&client_id, &imsg);
1183 c669c489 2022-12-30 thomas case GOTD_IMSG_ACCESS_GRANTED:
1184 7b1db75e 2023-01-14 thomas client->state = GOTD_CLIENT_STATE_ACCESS_GRANTED;
1186 c669c489 2022-12-30 thomas default:
1187 c669c489 2022-12-30 thomas do_disconnect = 1;
1188 c669c489 2022-12-30 thomas log_debug("unexpected imsg %d", imsg.hdr.type);
1192 c669c489 2022-12-30 thomas if (!verify_imsg_src(client, client->auth, &imsg)) {
1193 c669c489 2022-12-30 thomas do_disconnect = 1;
1194 c669c489 2022-12-30 thomas log_debug("dropping imsg type %d from PID %d",
1195 c669c489 2022-12-30 thomas imsg.hdr.type, client->auth->pid);
1197 c669c489 2022-12-30 thomas imsg_free(&imsg);
1199 c669c489 2022-12-30 thomas if (do_disconnect) {
1200 c669c489 2022-12-30 thomas if (err)
1201 c669c489 2022-12-30 thomas disconnect_on_error(client, err);
1203 c669c489 2022-12-30 thomas disconnect(client);
1207 5dcb3a43 2023-04-01 thomas repo = gotd_find_repo_by_name(client->auth->repo_name, &gotd);
1208 c669c489 2022-12-30 thomas if (repo == NULL) {
1209 c669c489 2022-12-30 thomas err = got_error(GOT_ERR_NOT_GIT_REPO);
1210 c669c489 2022-12-30 thomas goto done;
1212 c669c489 2022-12-30 thomas kill_auth_proc(client);
1214 e17294f7 2023-01-27 thomas log_info("authenticated uid %d for repository %s",
1215 c669c489 2022-12-30 thomas client->euid, repo->name);
1217 62ee7d94 2023-01-10 thomas err = start_session_child(client, repo, gotd.argv0,
1218 46ecc01f 2022-12-30 thomas gotd.confpath, gotd.daemonize, gotd.verbosity);
1219 62ee7d94 2023-01-10 thomas if (err)
1220 62ee7d94 2023-01-10 thomas goto done;
1222 c669c489 2022-12-30 thomas if (err)
1223 c669c489 2022-12-30 thomas log_warnx("uid %d: %s", client->euid, err->msg);
1225 c669c489 2022-12-30 thomas /* We might have killed the auth process by now. */
1226 c669c489 2022-12-30 thomas if (client->auth != NULL) {
1227 c669c489 2022-12-30 thomas if (!shut) {
1228 c669c489 2022-12-30 thomas gotd_imsg_event_add(iev);
1229 c669c489 2022-12-30 thomas } else {
1230 c669c489 2022-12-30 thomas /* This pipe is dead. Remove its event handler */
1231 c669c489 2022-12-30 thomas event_del(&iev->ev);
1236 62ee7d94 2023-01-10 thomas static const struct got_error *
1237 62ee7d94 2023-01-10 thomas connect_session(struct gotd_client *client)
1239 62ee7d94 2023-01-10 thomas const struct got_error *err = NULL;
1240 62ee7d94 2023-01-10 thomas struct gotd_imsg_connect iconnect;
1243 62ee7d94 2023-01-10 thomas memset(&iconnect, 0, sizeof(iconnect));
1245 62ee7d94 2023-01-10 thomas s = dup(client->fd);
1246 62ee7d94 2023-01-10 thomas if (s == -1)
1247 62ee7d94 2023-01-10 thomas return got_error_from_errno("dup");
1249 62ee7d94 2023-01-10 thomas iconnect.client_id = client->id;
1250 62ee7d94 2023-01-10 thomas iconnect.euid = client->euid;
1251 62ee7d94 2023-01-10 thomas iconnect.egid = client->egid;
1253 62ee7d94 2023-01-10 thomas if (gotd_imsg_compose_event(&client->session->iev, GOTD_IMSG_CONNECT,
1254 62ee7d94 2023-01-10 thomas PROC_GOTD, s, &iconnect, sizeof(iconnect)) == -1) {
1255 62ee7d94 2023-01-10 thomas err = got_error_from_errno("imsg compose CONNECT");
1256 62ee7d94 2023-01-10 thomas close(s);
1257 62ee7d94 2023-01-10 thomas return err;
1261 62ee7d94 2023-01-10 thomas * We are no longer interested in messages from this client.
1262 62ee7d94 2023-01-10 thomas * Further client requests will be handled by the session process.
1264 62ee7d94 2023-01-10 thomas msgbuf_clear(&client->iev.ibuf.w);
1265 62ee7d94 2023-01-10 thomas imsg_clear(&client->iev.ibuf);
1266 62ee7d94 2023-01-10 thomas event_del(&client->iev.ev);
1267 62ee7d94 2023-01-10 thomas client->fd = -1; /* will be closed via copy in client->iev.ibuf.fd */
1269 62ee7d94 2023-01-10 thomas return NULL;
1272 c669c489 2022-12-30 thomas static void
1273 62ee7d94 2023-01-10 thomas gotd_dispatch_client_session(int fd, short event, void *arg)
1275 85b37c72 2022-12-30 thomas struct gotd_imsgev *iev = arg;
1276 85b37c72 2022-12-30 thomas struct imsgbuf *ibuf = &iev->ibuf;
1277 3efd8e31 2022-10-23 thomas struct gotd_child_proc *proc = NULL;
1278 85b37c72 2022-12-30 thomas struct gotd_client *client = NULL;
1279 3efd8e31 2022-10-23 thomas ssize_t n;
1280 3efd8e31 2022-10-23 thomas int shut = 0;
1281 3efd8e31 2022-10-23 thomas struct imsg imsg;
1283 62ee7d94 2023-01-10 thomas client = find_client_by_proc_fd(fd);
1284 b7acbe65 2023-02-17 thomas if (client == NULL) {
1285 b7acbe65 2023-02-17 thomas /* Can happen during process teardown. */
1286 b7acbe65 2023-02-17 thomas warnx("cannot find client for fd %d", fd);
1287 b7acbe65 2023-02-17 thomas shut = 1;
1288 b7acbe65 2023-02-17 thomas goto done;
1291 3efd8e31 2022-10-23 thomas if (event & EV_READ) {
1292 3efd8e31 2022-10-23 thomas if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1293 3efd8e31 2022-10-23 thomas fatal("imsg_read error");
1294 3efd8e31 2022-10-23 thomas if (n == 0) {
1295 3efd8e31 2022-10-23 thomas /* Connection closed. */
1296 3efd8e31 2022-10-23 thomas shut = 1;
1297 3efd8e31 2022-10-23 thomas goto done;
1301 3efd8e31 2022-10-23 thomas if (event & EV_WRITE) {
1302 3efd8e31 2022-10-23 thomas n = msgbuf_write(&ibuf->w);
1303 3efd8e31 2022-10-23 thomas if (n == -1 && errno != EAGAIN)
1304 3efd8e31 2022-10-23 thomas fatal("msgbuf_write");
1305 3efd8e31 2022-10-23 thomas if (n == 0) {
1306 3efd8e31 2022-10-23 thomas /* Connection closed. */
1307 3efd8e31 2022-10-23 thomas shut = 1;
1308 3efd8e31 2022-10-23 thomas goto done;
1312 62ee7d94 2023-01-10 thomas proc = client->session;
1313 62ee7d94 2023-01-10 thomas if (proc == NULL)
1314 62ee7d94 2023-01-10 thomas fatalx("cannot find session child process for fd %d", fd);
1316 62ee7d94 2023-01-10 thomas for (;;) {
1317 62ee7d94 2023-01-10 thomas const struct got_error *err = NULL;
1318 62ee7d94 2023-01-10 thomas uint32_t client_id = 0;
1319 62ee7d94 2023-01-10 thomas int do_disconnect = 0, do_start_repo_child = 0;
1321 62ee7d94 2023-01-10 thomas if ((n = imsg_get(ibuf, &imsg)) == -1)
1322 62ee7d94 2023-01-10 thomas fatal("%s: imsg_get error", __func__);
1323 62ee7d94 2023-01-10 thomas if (n == 0) /* No more messages. */
1326 62ee7d94 2023-01-10 thomas switch (imsg.hdr.type) {
1327 62ee7d94 2023-01-10 thomas case GOTD_IMSG_ERROR:
1328 62ee7d94 2023-01-10 thomas do_disconnect = 1;
1329 62ee7d94 2023-01-10 thomas err = gotd_imsg_recv_error(&client_id, &imsg);
1331 62ee7d94 2023-01-10 thomas case GOTD_IMSG_CLIENT_SESSION_READY:
1332 7b1db75e 2023-01-14 thomas if (client->state != GOTD_CLIENT_STATE_ACCESS_GRANTED) {
1333 62ee7d94 2023-01-10 thomas err = got_error(GOT_ERR_PRIVSEP_MSG);
1336 62ee7d94 2023-01-10 thomas do_start_repo_child = 1;
1338 62ee7d94 2023-01-10 thomas case GOTD_IMSG_DISCONNECT:
1339 62ee7d94 2023-01-10 thomas do_disconnect = 1;
1341 62ee7d94 2023-01-10 thomas default:
1342 62ee7d94 2023-01-10 thomas log_debug("unexpected imsg %d", imsg.hdr.type);
1346 62ee7d94 2023-01-10 thomas if (!verify_imsg_src(client, proc, &imsg)) {
1347 62ee7d94 2023-01-10 thomas log_debug("dropping imsg type %d from PID %d",
1348 62ee7d94 2023-01-10 thomas imsg.hdr.type, proc->pid);
1349 62ee7d94 2023-01-10 thomas imsg_free(&imsg);
1350 62ee7d94 2023-01-10 thomas continue;
1352 62ee7d94 2023-01-10 thomas if (err)
1353 62ee7d94 2023-01-10 thomas log_warnx("uid %d: %s", client->euid, err->msg);
1355 62ee7d94 2023-01-10 thomas if (do_start_repo_child) {
1356 62ee7d94 2023-01-10 thomas struct gotd_repo *repo;
1357 5dcb3a43 2023-04-01 thomas const char *name = client->session->repo_name;
1359 5dcb3a43 2023-04-01 thomas repo = gotd_find_repo_by_name(name, &gotd);
1360 62ee7d94 2023-01-10 thomas if (repo != NULL) {
1361 62ee7d94 2023-01-10 thomas enum gotd_procid proc_type;
1363 62ee7d94 2023-01-10 thomas if (client->required_auth & GOTD_AUTH_WRITE)
1364 62ee7d94 2023-01-10 thomas proc_type = PROC_REPO_WRITE;
1366 62ee7d94 2023-01-10 thomas proc_type = PROC_REPO_READ;
1368 62ee7d94 2023-01-10 thomas err = start_repo_child(client, proc_type, repo,
1369 62ee7d94 2023-01-10 thomas gotd.argv0, gotd.confpath, gotd.daemonize,
1370 62ee7d94 2023-01-10 thomas gotd.verbosity);
1372 62ee7d94 2023-01-10 thomas err = got_error(GOT_ERR_NOT_GIT_REPO);
1374 62ee7d94 2023-01-10 thomas if (err) {
1375 62ee7d94 2023-01-10 thomas log_warnx("uid %d: %s", client->euid, err->msg);
1376 62ee7d94 2023-01-10 thomas do_disconnect = 1;
1380 62ee7d94 2023-01-10 thomas if (do_disconnect) {
1381 62ee7d94 2023-01-10 thomas if (err)
1382 62ee7d94 2023-01-10 thomas disconnect_on_error(client, err);
1384 62ee7d94 2023-01-10 thomas disconnect(client);
1387 62ee7d94 2023-01-10 thomas imsg_free(&imsg);
1390 62ee7d94 2023-01-10 thomas if (!shut) {
1391 62ee7d94 2023-01-10 thomas gotd_imsg_event_add(iev);
1392 62ee7d94 2023-01-10 thomas } else {
1393 62ee7d94 2023-01-10 thomas /* This pipe is dead. Remove its event handler */
1394 62ee7d94 2023-01-10 thomas event_del(&iev->ev);
1395 62ee7d94 2023-01-10 thomas disconnect(client);
1399 62ee7d94 2023-01-10 thomas static void
1400 62ee7d94 2023-01-10 thomas gotd_dispatch_repo_child(int fd, short event, void *arg)
1402 62ee7d94 2023-01-10 thomas struct gotd_imsgev *iev = arg;
1403 62ee7d94 2023-01-10 thomas struct imsgbuf *ibuf = &iev->ibuf;
1404 62ee7d94 2023-01-10 thomas struct gotd_child_proc *proc = NULL;
1405 62ee7d94 2023-01-10 thomas struct gotd_client *client;
1406 62ee7d94 2023-01-10 thomas ssize_t n;
1407 62ee7d94 2023-01-10 thomas int shut = 0;
1408 62ee7d94 2023-01-10 thomas struct imsg imsg;
1410 85b37c72 2022-12-30 thomas client = find_client_by_proc_fd(fd);
1411 b7acbe65 2023-02-17 thomas if (client == NULL) {
1412 b7acbe65 2023-02-17 thomas /* Can happen during process teardown. */
1413 b7acbe65 2023-02-17 thomas warnx("cannot find client for fd %d", fd);
1414 b7acbe65 2023-02-17 thomas shut = 1;
1415 b7acbe65 2023-02-17 thomas goto done;
1418 62ee7d94 2023-01-10 thomas if (event & EV_READ) {
1419 62ee7d94 2023-01-10 thomas if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1420 62ee7d94 2023-01-10 thomas fatal("imsg_read error");
1421 62ee7d94 2023-01-10 thomas if (n == 0) {
1422 62ee7d94 2023-01-10 thomas /* Connection closed. */
1423 62ee7d94 2023-01-10 thomas shut = 1;
1424 62ee7d94 2023-01-10 thomas goto done;
1428 62ee7d94 2023-01-10 thomas if (event & EV_WRITE) {
1429 62ee7d94 2023-01-10 thomas n = msgbuf_write(&ibuf->w);
1430 62ee7d94 2023-01-10 thomas if (n == -1 && errno != EAGAIN)
1431 62ee7d94 2023-01-10 thomas fatal("msgbuf_write");
1432 62ee7d94 2023-01-10 thomas if (n == 0) {
1433 62ee7d94 2023-01-10 thomas /* Connection closed. */
1434 62ee7d94 2023-01-10 thomas shut = 1;
1435 62ee7d94 2023-01-10 thomas goto done;
1439 27b11d77 2023-01-14 thomas proc = client->repo;
1440 3efd8e31 2022-10-23 thomas if (proc == NULL)
1441 3efd8e31 2022-10-23 thomas fatalx("cannot find child process for fd %d", fd);
1443 3efd8e31 2022-10-23 thomas for (;;) {
1444 3efd8e31 2022-10-23 thomas const struct got_error *err = NULL;
1445 3efd8e31 2022-10-23 thomas uint32_t client_id = 0;
1446 3efd8e31 2022-10-23 thomas int do_disconnect = 0;
1448 3efd8e31 2022-10-23 thomas if ((n = imsg_get(ibuf, &imsg)) == -1)
1449 3efd8e31 2022-10-23 thomas fatal("%s: imsg_get error", __func__);
1450 3efd8e31 2022-10-23 thomas if (n == 0) /* No more messages. */
1453 3efd8e31 2022-10-23 thomas switch (imsg.hdr.type) {
1454 3efd8e31 2022-10-23 thomas case GOTD_IMSG_ERROR:
1455 3efd8e31 2022-10-23 thomas do_disconnect = 1;
1456 3efd8e31 2022-10-23 thomas err = gotd_imsg_recv_error(&client_id, &imsg);
1458 85b37c72 2022-12-30 thomas case GOTD_IMSG_REPO_CHILD_READY:
1459 62ee7d94 2023-01-10 thomas err = connect_session(client);
1460 62ee7d94 2023-01-10 thomas if (err)
1462 62ee7d94 2023-01-10 thomas err = connect_repo_child(client, proc);
1464 3efd8e31 2022-10-23 thomas default:
1465 3efd8e31 2022-10-23 thomas log_debug("unexpected imsg %d", imsg.hdr.type);
1469 3efd8e31 2022-10-23 thomas if (!verify_imsg_src(client, proc, &imsg)) {
1470 3efd8e31 2022-10-23 thomas log_debug("dropping imsg type %d from PID %d",
1471 3efd8e31 2022-10-23 thomas imsg.hdr.type, proc->pid);
1472 3efd8e31 2022-10-23 thomas imsg_free(&imsg);
1473 3efd8e31 2022-10-23 thomas continue;
1475 3efd8e31 2022-10-23 thomas if (err)
1476 3efd8e31 2022-10-23 thomas log_warnx("uid %d: %s", client->euid, err->msg);
1478 3efd8e31 2022-10-23 thomas if (do_disconnect) {
1479 3efd8e31 2022-10-23 thomas if (err)
1480 3efd8e31 2022-10-23 thomas disconnect_on_error(client, err);
1482 3efd8e31 2022-10-23 thomas disconnect(client);
1485 3efd8e31 2022-10-23 thomas imsg_free(&imsg);
1488 3efd8e31 2022-10-23 thomas if (!shut) {
1489 3efd8e31 2022-10-23 thomas gotd_imsg_event_add(iev);
1490 3efd8e31 2022-10-23 thomas } else {
1491 3efd8e31 2022-10-23 thomas /* This pipe is dead. Remove its event handler */
1492 3efd8e31 2022-10-23 thomas event_del(&iev->ev);
1493 62ee7d94 2023-01-10 thomas disconnect(client);
1497 3efd8e31 2022-10-23 thomas static pid_t
1498 414e37cb 2022-12-30 thomas start_child(enum gotd_procid proc_id, const char *repo_path,
1499 832b8374 2022-10-31 thomas char *argv0, const char *confpath, int fd, int daemonize, int verbosity)
1501 832b8374 2022-10-31 thomas char *argv[11];
1502 3efd8e31 2022-10-23 thomas int argc = 0;
1503 3efd8e31 2022-10-23 thomas pid_t pid;
1505 3efd8e31 2022-10-23 thomas switch (pid = fork()) {
1506 3efd8e31 2022-10-23 thomas case -1:
1507 3efd8e31 2022-10-23 thomas fatal("cannot fork");
1510 3efd8e31 2022-10-23 thomas default:
1511 3efd8e31 2022-10-23 thomas close(fd);
1512 3efd8e31 2022-10-23 thomas return pid;
1515 bb3a6ce9 2022-11-17 thomas if (fd != GOTD_FILENO_MSG_PIPE) {
1516 bb3a6ce9 2022-11-17 thomas if (dup2(fd, GOTD_FILENO_MSG_PIPE) == -1)
1517 3efd8e31 2022-10-23 thomas fatal("cannot setup imsg fd");
1518 3efd8e31 2022-10-23 thomas } else if (fcntl(fd, F_SETFD, 0) == -1)
1519 3efd8e31 2022-10-23 thomas fatal("cannot setup imsg fd");
1521 3efd8e31 2022-10-23 thomas argv[argc++] = argv0;
1522 3efd8e31 2022-10-23 thomas switch (proc_id) {
1523 2b3d32a1 2022-12-30 thomas case PROC_LISTEN:
1524 2b3d32a1 2022-12-30 thomas argv[argc++] = (char *)"-L";
1526 c669c489 2022-12-30 thomas case PROC_AUTH:
1527 c669c489 2022-12-30 thomas argv[argc++] = (char *)"-A";
1529 7fed8fa4 2023-06-22 thomas case PROC_SESSION_READ:
1530 7fed8fa4 2023-06-22 thomas argv[argc++] = (char *)"-s";
1532 7fed8fa4 2023-06-22 thomas case PROC_SESSION_WRITE:
1533 62ee7d94 2023-01-10 thomas argv[argc++] = (char *)"-S";
1535 3efd8e31 2022-10-23 thomas case PROC_REPO_READ:
1536 3efd8e31 2022-10-23 thomas argv[argc++] = (char *)"-R";
1538 3efd8e31 2022-10-23 thomas case PROC_REPO_WRITE:
1539 3efd8e31 2022-10-23 thomas argv[argc++] = (char *)"-W";
1541 3efd8e31 2022-10-23 thomas default:
1542 3efd8e31 2022-10-23 thomas fatalx("invalid process id %d", proc_id);
1545 832b8374 2022-10-31 thomas argv[argc++] = (char *)"-f";
1546 832b8374 2022-10-31 thomas argv[argc++] = (char *)confpath;
1548 414e37cb 2022-12-30 thomas if (repo_path) {
1549 2b3d32a1 2022-12-30 thomas argv[argc++] = (char *)"-P";
1550 414e37cb 2022-12-30 thomas argv[argc++] = (char *)repo_path;
1553 3efd8e31 2022-10-23 thomas if (!daemonize)
1554 3efd8e31 2022-10-23 thomas argv[argc++] = (char *)"-d";
1555 3efd8e31 2022-10-23 thomas if (verbosity > 0)
1556 3efd8e31 2022-10-23 thomas argv[argc++] = (char *)"-v";
1557 3efd8e31 2022-10-23 thomas if (verbosity > 1)
1558 3efd8e31 2022-10-23 thomas argv[argc++] = (char *)"-v";
1559 3efd8e31 2022-10-23 thomas argv[argc++] = NULL;
1561 3efd8e31 2022-10-23 thomas execvp(argv0, argv);
1562 3efd8e31 2022-10-23 thomas fatal("execvp");
1565 3efd8e31 2022-10-23 thomas static void
1566 2b3d32a1 2022-12-30 thomas start_listener(char *argv0, const char *confpath, int daemonize, int verbosity)
1568 78943464 2023-06-22 thomas struct gotd_child_proc *proc;
1569 fde1a996 2023-08-23 thomas int sock_flags = SOCK_STREAM|SOCK_NONBLOCK;
1571 fde1a996 2023-08-23 thomas #ifdef SOCK_CLOEXEC
1572 fde1a996 2023-08-23 thomas sock_flags |= SOCK_CLOEXEC;
1575 78943464 2023-06-22 thomas proc = calloc(1, sizeof(*proc));
1576 78943464 2023-06-22 thomas if (proc == NULL)
1577 78943464 2023-06-22 thomas fatal("calloc");
1579 2c8fb90b 2023-06-25 thomas TAILQ_INSERT_HEAD(&procs, proc, entry);
1581 2c8fb90b 2023-06-25 thomas /* proc->tmo is initialized in main() after event_init() */
1583 2b3d32a1 2022-12-30 thomas proc->type = PROC_LISTEN;
1585 621b8de0 2023-08-23 thomas if (socketpair(AF_UNIX, sock_flags,
1586 2b3d32a1 2022-12-30 thomas PF_UNSPEC, proc->pipe) == -1)
1587 2b3d32a1 2022-12-30 thomas fatal("socketpair");
1589 2b3d32a1 2022-12-30 thomas proc->pid = start_child(proc->type, NULL, argv0, confpath,
1590 2b3d32a1 2022-12-30 thomas proc->pipe[1], daemonize, verbosity);
1591 2b3d32a1 2022-12-30 thomas imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1592 85b37c72 2022-12-30 thomas proc->iev.handler = gotd_dispatch_listener;
1593 2b3d32a1 2022-12-30 thomas proc->iev.events = EV_READ;
1594 2b3d32a1 2022-12-30 thomas proc->iev.handler_arg = NULL;
1596 78943464 2023-06-22 thomas gotd.listen_proc = proc;
1599 85b37c72 2022-12-30 thomas static const struct got_error *
1600 62ee7d94 2023-01-10 thomas start_session_child(struct gotd_client *client, struct gotd_repo *repo,
1601 62ee7d94 2023-01-10 thomas char *argv0, const char *confpath, int daemonize, int verbosity)
1603 62ee7d94 2023-01-10 thomas struct gotd_child_proc *proc;
1604 621b8de0 2023-08-23 thomas int sock_flags = SOCK_STREAM | SOCK_NONBLOCK;
1606 621b8de0 2023-08-23 thomas #ifdef SOCK_CLOEXEC
1607 621b8de0 2023-08-23 thomas sock_flags |= SOCK_CLOEXEC;
1610 62ee7d94 2023-01-10 thomas proc = calloc(1, sizeof(*proc));
1611 62ee7d94 2023-01-10 thomas if (proc == NULL)
1612 62ee7d94 2023-01-10 thomas return got_error_from_errno("calloc");
1614 2c8fb90b 2023-06-25 thomas TAILQ_INSERT_HEAD(&procs, proc, entry);
1615 2c8fb90b 2023-06-25 thomas evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1617 7fed8fa4 2023-06-22 thomas if (client_is_reading(client))
1618 7fed8fa4 2023-06-22 thomas proc->type = PROC_SESSION_READ;
1620 7fed8fa4 2023-06-22 thomas proc->type = PROC_SESSION_WRITE;
1621 62ee7d94 2023-01-10 thomas if (strlcpy(proc->repo_name, repo->name,
1622 62ee7d94 2023-01-10 thomas sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1623 62ee7d94 2023-01-10 thomas fatalx("repository name too long: %s", repo->name);
1624 62ee7d94 2023-01-10 thomas log_debug("starting client uid %d session for repository %s",
1625 62ee7d94 2023-01-10 thomas client->euid, repo->name);
1626 62ee7d94 2023-01-10 thomas if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1627 62ee7d94 2023-01-10 thomas sizeof(proc->repo_path))
1628 62ee7d94 2023-01-10 thomas fatalx("repository path too long: %s", repo->path);
1629 621b8de0 2023-08-23 thomas if (socketpair(AF_UNIX, sock_flags, PF_UNSPEC, proc->pipe) == -1)
1630 62ee7d94 2023-01-10 thomas fatal("socketpair");
1631 62ee7d94 2023-01-10 thomas proc->pid = start_child(proc->type, proc->repo_path, argv0,
1632 62ee7d94 2023-01-10 thomas confpath, proc->pipe[1], daemonize, verbosity);
1633 62ee7d94 2023-01-10 thomas imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1634 62ee7d94 2023-01-10 thomas log_debug("proc %s %s is on fd %d",
1635 62ee7d94 2023-01-10 thomas gotd_proc_names[proc->type], proc->repo_path,
1636 62ee7d94 2023-01-10 thomas proc->pipe[0]);
1637 62ee7d94 2023-01-10 thomas proc->iev.handler = gotd_dispatch_client_session;
1638 62ee7d94 2023-01-10 thomas proc->iev.events = EV_READ;
1639 62ee7d94 2023-01-10 thomas proc->iev.handler_arg = NULL;
1640 62ee7d94 2023-01-10 thomas event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1641 62ee7d94 2023-01-10 thomas gotd_dispatch_client_session, &proc->iev);
1642 62ee7d94 2023-01-10 thomas gotd_imsg_event_add(&proc->iev);
1644 62ee7d94 2023-01-10 thomas client->session = proc;
1645 62ee7d94 2023-01-10 thomas return NULL;
1648 62ee7d94 2023-01-10 thomas static const struct got_error *
1649 85b37c72 2022-12-30 thomas start_repo_child(struct gotd_client *client, enum gotd_procid proc_type,
1650 85b37c72 2022-12-30 thomas struct gotd_repo *repo, char *argv0, const char *confpath,
1651 832b8374 2022-10-31 thomas int daemonize, int verbosity)
1653 3efd8e31 2022-10-23 thomas struct gotd_child_proc *proc;
1654 621b8de0 2023-08-23 thomas int sock_flags = SOCK_STREAM|SOCK_NONBLOCK;
1656 621b8de0 2023-08-23 thomas #ifdef SOCK_CLOEXEC
1657 621b8de0 2023-08-23 thomas sock_flags |= SOCK_CLOEXEC;
1660 85b37c72 2022-12-30 thomas if (proc_type != PROC_REPO_READ && proc_type != PROC_REPO_WRITE)
1661 85b37c72 2022-12-30 thomas return got_error_msg(GOT_ERR_NOT_IMPL, "bad process type");
1663 85b37c72 2022-12-30 thomas proc = calloc(1, sizeof(*proc));
1664 85b37c72 2022-12-30 thomas if (proc == NULL)
1665 85b37c72 2022-12-30 thomas return got_error_from_errno("calloc");
1667 2c8fb90b 2023-06-25 thomas TAILQ_INSERT_HEAD(&procs, proc, entry);
1668 2c8fb90b 2023-06-25 thomas evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1670 85b37c72 2022-12-30 thomas proc->type = proc_type;
1671 85b37c72 2022-12-30 thomas if (strlcpy(proc->repo_name, repo->name,
1672 85b37c72 2022-12-30 thomas sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1673 85b37c72 2022-12-30 thomas fatalx("repository name too long: %s", repo->name);
1674 85b37c72 2022-12-30 thomas log_debug("starting %s for repository %s",
1675 85b37c72 2022-12-30 thomas proc->type == PROC_REPO_READ ? "reader" : "writer", repo->name);
1677 fe6a8988 2023-01-08 thomas if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1678 fe6a8988 2023-01-08 thomas sizeof(proc->repo_path))
1679 fe6a8988 2023-01-08 thomas fatalx("repository path too long: %s", repo->path);
1680 621b8de0 2023-08-23 thomas if (realpath(repo->path, proc->repo_path) == NULL)
1681 621b8de0 2023-08-23 thomas fatal("%s", repo->path);
1682 621b8de0 2023-08-23 thomas if (socketpair(AF_UNIX, sock_flags,
1683 85b37c72 2022-12-30 thomas PF_UNSPEC, proc->pipe) == -1)
1684 85b37c72 2022-12-30 thomas fatal("socketpair");
1685 85b37c72 2022-12-30 thomas proc->pid = start_child(proc->type, proc->repo_path, argv0,
1686 85b37c72 2022-12-30 thomas confpath, proc->pipe[1], daemonize, verbosity);
1687 85b37c72 2022-12-30 thomas imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1688 85b37c72 2022-12-30 thomas log_debug("proc %s %s is on fd %d",
1689 85b37c72 2022-12-30 thomas gotd_proc_names[proc->type], proc->repo_path,
1690 85b37c72 2022-12-30 thomas proc->pipe[0]);
1691 85b37c72 2022-12-30 thomas proc->iev.handler = gotd_dispatch_repo_child;
1692 85b37c72 2022-12-30 thomas proc->iev.events = EV_READ;
1693 85b37c72 2022-12-30 thomas proc->iev.handler_arg = NULL;
1694 85b37c72 2022-12-30 thomas event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1695 85b37c72 2022-12-30 thomas gotd_dispatch_repo_child, &proc->iev);
1696 85b37c72 2022-12-30 thomas gotd_imsg_event_add(&proc->iev);
1698 27b11d77 2023-01-14 thomas client->repo = proc;
1699 c669c489 2022-12-30 thomas return NULL;
1702 c669c489 2022-12-30 thomas static const struct got_error *
1703 c669c489 2022-12-30 thomas start_auth_child(struct gotd_client *client, int required_auth,
1704 c669c489 2022-12-30 thomas struct gotd_repo *repo, char *argv0, const char *confpath,
1705 c669c489 2022-12-30 thomas int daemonize, int verbosity)
1707 0bcde4c8 2022-12-30 thomas const struct got_error *err = NULL;
1708 c669c489 2022-12-30 thomas struct gotd_child_proc *proc;
1709 c669c489 2022-12-30 thomas struct gotd_imsg_auth iauth;
1711 621b8de0 2023-08-23 thomas int sock_flags = SOCK_STREAM|SOCK_NONBLOCK;
1713 621b8de0 2023-08-23 thomas #ifdef SOCK_CLOEXEC
1714 621b8de0 2023-08-23 thomas sock_flags |= SOCK_CLOEXEC;
1717 c669c489 2022-12-30 thomas memset(&iauth, 0, sizeof(iauth));
1719 0bcde4c8 2022-12-30 thomas fd = dup(client->fd);
1720 0bcde4c8 2022-12-30 thomas if (fd == -1)
1721 0bcde4c8 2022-12-30 thomas return got_error_from_errno("dup");
1723 c669c489 2022-12-30 thomas proc = calloc(1, sizeof(*proc));
1724 0bcde4c8 2022-12-30 thomas if (proc == NULL) {
1725 0bcde4c8 2022-12-30 thomas err = got_error_from_errno("calloc");
1726 0bcde4c8 2022-12-30 thomas close(fd);
1727 0bcde4c8 2022-12-30 thomas return err;
1730 2c8fb90b 2023-06-25 thomas TAILQ_INSERT_HEAD(&procs, proc, entry);
1731 2c8fb90b 2023-06-25 thomas evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1733 c669c489 2022-12-30 thomas proc->type = PROC_AUTH;
1734 c669c489 2022-12-30 thomas if (strlcpy(proc->repo_name, repo->name,
1735 c669c489 2022-12-30 thomas sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1736 c669c489 2022-12-30 thomas fatalx("repository name too long: %s", repo->name);
1737 c669c489 2022-12-30 thomas log_debug("starting auth for uid %d repository %s",
1738 c669c489 2022-12-30 thomas client->euid, repo->name);
1739 fe6a8988 2023-01-08 thomas if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1740 fe6a8988 2023-01-08 thomas sizeof(proc->repo_path))
1741 fe6a8988 2023-01-08 thomas fatalx("repository path too long: %s", repo->path);
1742 621b8de0 2023-08-23 thomas if (realpath(repo->path, proc->repo_path) == NULL)
1743 621b8de0 2023-08-23 thomas fatal("%s", repo->path);
1744 621b8de0 2023-08-23 thomas if (socketpair(AF_UNIX, sock_flags,
1745 c669c489 2022-12-30 thomas PF_UNSPEC, proc->pipe) == -1)
1746 c669c489 2022-12-30 thomas fatal("socketpair");
1747 c669c489 2022-12-30 thomas proc->pid = start_child(proc->type, proc->repo_path, argv0,
1748 c669c489 2022-12-30 thomas confpath, proc->pipe[1], daemonize, verbosity);
1749 c669c489 2022-12-30 thomas imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1750 c669c489 2022-12-30 thomas log_debug("proc %s %s is on fd %d",
1751 c669c489 2022-12-30 thomas gotd_proc_names[proc->type], proc->repo_path,
1752 c669c489 2022-12-30 thomas proc->pipe[0]);
1753 c669c489 2022-12-30 thomas proc->iev.handler = gotd_dispatch_auth_child;
1754 c669c489 2022-12-30 thomas proc->iev.events = EV_READ;
1755 c669c489 2022-12-30 thomas proc->iev.handler_arg = NULL;
1756 c669c489 2022-12-30 thomas event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1757 c669c489 2022-12-30 thomas gotd_dispatch_auth_child, &proc->iev);
1758 c669c489 2022-12-30 thomas gotd_imsg_event_add(&proc->iev);
1760 c669c489 2022-12-30 thomas iauth.euid = client->euid;
1761 c669c489 2022-12-30 thomas iauth.egid = client->egid;
1762 c669c489 2022-12-30 thomas iauth.required_auth = required_auth;
1763 c669c489 2022-12-30 thomas iauth.client_id = client->id;
1764 c669c489 2022-12-30 thomas if (gotd_imsg_compose_event(&proc->iev, GOTD_IMSG_AUTHENTICATE,
1765 0bcde4c8 2022-12-30 thomas PROC_GOTD, fd, &iauth, sizeof(iauth)) == -1) {
1766 c669c489 2022-12-30 thomas log_warn("imsg compose AUTHENTICATE");
1767 0bcde4c8 2022-12-30 thomas close(fd);
1768 0bcde4c8 2022-12-30 thomas /* Let the auth_timeout handler tidy up. */
1771 c669c489 2022-12-30 thomas client->auth = proc;
1772 c669c489 2022-12-30 thomas client->required_auth = required_auth;
1773 85b37c72 2022-12-30 thomas return NULL;
1776 414e37cb 2022-12-30 thomas static void
1777 7fed8fa4 2023-06-22 thomas apply_unveil_repo_readonly(const char *repo_path, int need_tmpdir)
1779 7fed8fa4 2023-06-22 thomas if (need_tmpdir) {
1780 7fed8fa4 2023-06-22 thomas if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
1781 7fed8fa4 2023-06-22 thomas fatal("unveil %s", GOT_TMPDIR_STR);
1784 414e37cb 2022-12-30 thomas if (unveil(repo_path, "r") == -1)
1785 414e37cb 2022-12-30 thomas fatal("unveil %s", repo_path);
1787 b942ab08 2022-12-30 thomas if (unveil(NULL, NULL) == -1)
1788 b942ab08 2022-12-30 thomas fatal("unveil");
1791 b942ab08 2022-12-30 thomas static void
1792 62ee7d94 2023-01-10 thomas apply_unveil_repo_readwrite(const char *repo_path)
1794 62ee7d94 2023-01-10 thomas if (unveil(repo_path, "rwc") == -1)
1795 62ee7d94 2023-01-10 thomas fatal("unveil %s", repo_path);
1797 62ee7d94 2023-01-10 thomas if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
1798 62ee7d94 2023-01-10 thomas fatal("unveil %s", GOT_TMPDIR_STR);
1800 62ee7d94 2023-01-10 thomas if (unveil(NULL, NULL) == -1)
1801 62ee7d94 2023-01-10 thomas fatal("unveil");
1804 62ee7d94 2023-01-10 thomas static void
1805 b942ab08 2022-12-30 thomas apply_unveil_none(void)
1807 b942ab08 2022-12-30 thomas if (unveil("/", "") == -1)
1808 b942ab08 2022-12-30 thomas fatal("unveil");
1810 414e37cb 2022-12-30 thomas if (unveil(NULL, NULL) == -1)
1811 414e37cb 2022-12-30 thomas fatal("unveil");
1814 3efd8e31 2022-10-23 thomas static void
1815 62ee7d94 2023-01-10 thomas apply_unveil_selfexec(void)
1817 85b37c72 2022-12-30 thomas if (unveil(gotd.argv0, "x") == -1)
1818 85b37c72 2022-12-30 thomas fatal("unveil %s", gotd.argv0);
1820 3efd8e31 2022-10-23 thomas if (unveil(NULL, NULL) == -1)
1821 3efd8e31 2022-10-23 thomas fatal("unveil");
1825 3efd8e31 2022-10-23 thomas main(int argc, char **argv)
1827 3efd8e31 2022-10-23 thomas const struct got_error *error = NULL;
1828 3efd8e31 2022-10-23 thomas int ch, fd = -1, daemonize = 1, verbosity = 0, noaction = 0;
1829 3efd8e31 2022-10-23 thomas const char *confpath = GOTD_CONF_PATH;
1830 3efd8e31 2022-10-23 thomas char *argv0 = argv[0];
1831 3efd8e31 2022-10-23 thomas char title[2048];
1832 3efd8e31 2022-10-23 thomas struct passwd *pw = NULL;
1833 3efd8e31 2022-10-23 thomas char *repo_path = NULL;
1834 3efd8e31 2022-10-23 thomas enum gotd_procid proc_id = PROC_GOTD;
1835 2c8fb90b 2023-06-25 thomas struct event evsigint, evsigterm, evsighup, evsigusr1, evsigchld;
1836 3efd8e31 2022-10-23 thomas int *pack_fds = NULL, *temp_fds = NULL;
1837 6d7eb4f7 2023-04-04 thomas struct gotd_repo *repo = NULL;
1839 2c8fb90b 2023-06-25 thomas TAILQ_INIT(&procs);
1841 3efd8e31 2022-10-23 thomas log_init(1, LOG_DAEMON); /* Log to stderr until daemonized. */
1843 7fed8fa4 2023-06-22 thomas while ((ch = getopt(argc, argv, "Adf:LnP:RsSvW")) != -1) {
1844 3efd8e31 2022-10-23 thomas switch (ch) {
1845 c669c489 2022-12-30 thomas case 'A':
1846 c669c489 2022-12-30 thomas proc_id = PROC_AUTH;
1848 3efd8e31 2022-10-23 thomas case 'd':
1849 3efd8e31 2022-10-23 thomas daemonize = 0;
1851 3efd8e31 2022-10-23 thomas case 'f':
1852 3efd8e31 2022-10-23 thomas confpath = optarg;
1854 2b3d32a1 2022-12-30 thomas case 'L':
1855 2b3d32a1 2022-12-30 thomas proc_id = PROC_LISTEN;
1857 3efd8e31 2022-10-23 thomas case 'n':
1858 3efd8e31 2022-10-23 thomas noaction = 1;
1860 f7065961 2022-10-27 thomas case 'P':
1861 f7065961 2022-10-27 thomas repo_path = realpath(optarg, NULL);
1862 f7065961 2022-10-27 thomas if (repo_path == NULL)
1863 f7065961 2022-10-27 thomas fatal("realpath '%s'", optarg);
1865 3efd8e31 2022-10-23 thomas case 'R':
1866 3efd8e31 2022-10-23 thomas proc_id = PROC_REPO_READ;
1868 7fed8fa4 2023-06-22 thomas case 's':
1869 7fed8fa4 2023-06-22 thomas proc_id = PROC_SESSION_READ;
1871 62ee7d94 2023-01-10 thomas case 'S':
1872 7fed8fa4 2023-06-22 thomas proc_id = PROC_SESSION_WRITE;
1874 f7065961 2022-10-27 thomas case 'v':
1875 f7065961 2022-10-27 thomas if (verbosity < 3)
1876 f7065961 2022-10-27 thomas verbosity++;
1878 3efd8e31 2022-10-23 thomas case 'W':
1879 3efd8e31 2022-10-23 thomas proc_id = PROC_REPO_WRITE;
1881 3efd8e31 2022-10-23 thomas default:
1882 3efd8e31 2022-10-23 thomas usage();
1886 3efd8e31 2022-10-23 thomas argc -= optind;
1887 3efd8e31 2022-10-23 thomas argv += optind;
1889 3efd8e31 2022-10-23 thomas if (argc != 0)
1890 3efd8e31 2022-10-23 thomas usage();
1892 85b37c72 2022-12-30 thomas if (geteuid() && (proc_id == PROC_GOTD || proc_id == PROC_LISTEN))
1893 3efd8e31 2022-10-23 thomas fatalx("need root privileges");
1895 f3807fe5 2023-07-10 thomas if (parse_config(confpath, proc_id, &gotd) != 0)
1896 3efd8e31 2022-10-23 thomas return 1;
1898 3efd8e31 2022-10-23 thomas pw = getpwnam(gotd.user_name);
1899 3efd8e31 2022-10-23 thomas if (pw == NULL)
1900 3e7c54e1 2022-12-30 thomas fatalx("user %s not found", gotd.user_name);
1902 b4b04e88 2023-01-19 thomas if (pw->pw_uid == 0)
1903 b4b04e88 2023-01-19 thomas fatalx("cannot run %s as the superuser", getprogname());
1905 b4b04e88 2023-01-19 thomas if (noaction) {
1906 b4b04e88 2023-01-19 thomas fprintf(stderr, "configuration OK\n");
1907 3efd8e31 2022-10-23 thomas return 0;
1910 b4b04e88 2023-01-19 thomas gotd.argv0 = argv0;
1911 b4b04e88 2023-01-19 thomas gotd.daemonize = daemonize;
1912 b4b04e88 2023-01-19 thomas gotd.verbosity = verbosity;
1913 b4b04e88 2023-01-19 thomas gotd.confpath = confpath;
1915 b4b04e88 2023-01-19 thomas /* Require an absolute path in argv[0] for reliable re-exec. */
1916 b4b04e88 2023-01-19 thomas if (!got_path_is_absolute(argv0))
1917 b4b04e88 2023-01-19 thomas fatalx("bad path \"%s\": must be an absolute path", argv0);
1919 b4b04e88 2023-01-19 thomas log_init(daemonize ? 0 : 1, LOG_DAEMON);
1920 b4b04e88 2023-01-19 thomas log_setverbose(verbosity);
1922 1eec6e4e 2022-12-06 thomas if (proc_id == PROC_GOTD) {
1923 2b3d32a1 2022-12-30 thomas snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
1924 2b3d32a1 2022-12-30 thomas arc4random_buf(&clients_hash_key, sizeof(clients_hash_key));
1925 2b3d32a1 2022-12-30 thomas if (daemonize && daemon(1, 0) == -1)
1926 2b3d32a1 2022-12-30 thomas fatal("daemon");
1927 1f1613cf 2023-01-23 thomas gotd.pid = getpid();
1928 1f1613cf 2023-01-23 thomas start_listener(argv0, confpath, daemonize, verbosity);
1929 2b3d32a1 2022-12-30 thomas } else if (proc_id == PROC_LISTEN) {
1930 2b3d32a1 2022-12-30 thomas snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
1931 1eec6e4e 2022-12-06 thomas if (verbosity) {
1932 1eec6e4e 2022-12-06 thomas log_info("socket: %s", gotd.unix_socket_path);
1933 1eec6e4e 2022-12-06 thomas log_info("user: %s", pw->pw_name);
1936 3efd8e31 2022-10-23 thomas fd = unix_socket_listen(gotd.unix_socket_path, pw->pw_uid,
1937 f2fc8ce0 2023-01-06 thomas pw->pw_gid);
1938 3efd8e31 2022-10-23 thomas if (fd == -1) {
1939 3efd8e31 2022-10-23 thomas fatal("cannot listen on unix socket %s",
1940 3efd8e31 2022-10-23 thomas gotd.unix_socket_path);
1942 c669c489 2022-12-30 thomas } else if (proc_id == PROC_AUTH) {
1943 c669c489 2022-12-30 thomas snprintf(title, sizeof(title), "%s %s",
1944 c669c489 2022-12-30 thomas gotd_proc_names[proc_id], repo_path);
1945 62ee7d94 2023-01-10 thomas } else if (proc_id == PROC_REPO_READ || proc_id == PROC_REPO_WRITE ||
1946 7fed8fa4 2023-06-22 thomas proc_id == PROC_SESSION_READ || proc_id == PROC_SESSION_WRITE) {
1947 3efd8e31 2022-10-23 thomas error = got_repo_pack_fds_open(&pack_fds);
1948 3efd8e31 2022-10-23 thomas if (error != NULL)
1949 3efd8e31 2022-10-23 thomas fatalx("cannot open pack tempfiles: %s", error->msg);
1950 3efd8e31 2022-10-23 thomas error = got_repo_temp_fds_open(&temp_fds);
1951 3efd8e31 2022-10-23 thomas if (error != NULL)
1952 3efd8e31 2022-10-23 thomas fatalx("cannot open pack tempfiles: %s", error->msg);
1953 3efd8e31 2022-10-23 thomas if (repo_path == NULL)
1954 3efd8e31 2022-10-23 thomas fatalx("repository path not specified");
1955 3efd8e31 2022-10-23 thomas snprintf(title, sizeof(title), "%s %s",
1956 3efd8e31 2022-10-23 thomas gotd_proc_names[proc_id], repo_path);
1958 3efd8e31 2022-10-23 thomas fatal("invalid process id %d", proc_id);
1960 3efd8e31 2022-10-23 thomas setproctitle("%s", title);
1961 3efd8e31 2022-10-23 thomas log_procinit(title);
1963 3efd8e31 2022-10-23 thomas /* Drop root privileges. */
1964 3efd8e31 2022-10-23 thomas if (setgid(pw->pw_gid) == -1)
1965 3efd8e31 2022-10-23 thomas fatal("setgid %d failed", pw->pw_gid);
1966 3efd8e31 2022-10-23 thomas if (setuid(pw->pw_uid) == -1)
1967 3efd8e31 2022-10-23 thomas fatal("setuid %d failed", pw->pw_uid);
1969 3efd8e31 2022-10-23 thomas event_init();
1971 3efd8e31 2022-10-23 thomas switch (proc_id) {
1972 3efd8e31 2022-10-23 thomas case PROC_GOTD:
1973 3efd8e31 2022-10-23 thomas #ifndef PROFILE
1974 62ee7d94 2023-01-10 thomas /* "exec" promise will be limited to argv[0] via unveil(2). */
1975 62ee7d94 2023-01-10 thomas if (pledge("stdio proc exec sendfd recvfd unveil", NULL) == -1)
1976 3efd8e31 2022-10-23 thomas err(1, "pledge");
1979 2b3d32a1 2022-12-30 thomas case PROC_LISTEN:
1980 2b3d32a1 2022-12-30 thomas #ifndef PROFILE
1981 d4940d40 2023-01-06 thomas if (pledge("stdio sendfd unix unveil", NULL) == -1)
1982 2b3d32a1 2022-12-30 thomas err(1, "pledge");
1985 d4940d40 2023-01-06 thomas * Ensure that AF_UNIX bind(2) cannot be used with any other
1986 d4940d40 2023-01-06 thomas * sockets by revoking all filesystem access via unveil(2).
1988 d4940d40 2023-01-06 thomas apply_unveil_none();
1990 0781db0e 2023-01-06 thomas listen_main(title, fd, gotd.connection_limits,
1991 0781db0e 2023-01-06 thomas gotd.nconnection_limits);
1992 2b3d32a1 2022-12-30 thomas /* NOTREACHED */
1994 c669c489 2022-12-30 thomas case PROC_AUTH:
1995 c669c489 2022-12-30 thomas #ifndef PROFILE
1996 b942ab08 2022-12-30 thomas if (pledge("stdio getpw recvfd unix unveil", NULL) == -1)
1997 c669c489 2022-12-30 thomas err(1, "pledge");
2000 b942ab08 2022-12-30 thomas * We need the "unix" pledge promise for getpeername(2) only.
2001 b942ab08 2022-12-30 thomas * Ensure that AF_UNIX bind(2) cannot be used by revoking all
2002 b942ab08 2022-12-30 thomas * filesystem access via unveil(2). Access to password database
2003 b942ab08 2022-12-30 thomas * files will still work since "getpw" bypasses unveil(2).
2005 b942ab08 2022-12-30 thomas apply_unveil_none();
2007 c669c489 2022-12-30 thomas auth_main(title, &gotd.repos, repo_path);
2008 c669c489 2022-12-30 thomas /* NOTREACHED */
2010 7fed8fa4 2023-06-22 thomas case PROC_SESSION_READ:
2011 7fed8fa4 2023-06-22 thomas case PROC_SESSION_WRITE:
2012 62ee7d94 2023-01-10 thomas #ifndef PROFILE
2014 62ee7d94 2023-01-10 thomas * The "recvfd" promise is only needed during setup and
2015 62ee7d94 2023-01-10 thomas * will be removed in a later pledge(2) call.
2017 62ee7d94 2023-01-10 thomas if (pledge("stdio rpath wpath cpath recvfd sendfd fattr flock "
2018 62ee7d94 2023-01-10 thomas "unveil", NULL) == -1)
2019 62ee7d94 2023-01-10 thomas err(1, "pledge");
2021 7fed8fa4 2023-06-22 thomas if (proc_id == PROC_SESSION_READ)
2022 7fed8fa4 2023-06-22 thomas apply_unveil_repo_readonly(repo_path, 1);
2024 7fed8fa4 2023-06-22 thomas apply_unveil_repo_readwrite(repo_path);
2025 62ee7d94 2023-01-10 thomas session_main(title, repo_path, pack_fds, temp_fds,
2026 7fed8fa4 2023-06-22 thomas &gotd.request_timeout, proc_id);
2027 62ee7d94 2023-01-10 thomas /* NOTREACHED */
2029 3efd8e31 2022-10-23 thomas case PROC_REPO_READ:
2030 3efd8e31 2022-10-23 thomas #ifndef PROFILE
2031 414e37cb 2022-12-30 thomas if (pledge("stdio rpath recvfd unveil", NULL) == -1)
2032 3efd8e31 2022-10-23 thomas err(1, "pledge");
2034 7fed8fa4 2023-06-22 thomas apply_unveil_repo_readonly(repo_path, 0);
2035 414e37cb 2022-12-30 thomas repo_read_main(title, repo_path, pack_fds, temp_fds);
2036 3efd8e31 2022-10-23 thomas /* NOTREACHED */
2037 3efd8e31 2022-10-23 thomas exit(0);
2038 3efd8e31 2022-10-23 thomas case PROC_REPO_WRITE:
2039 3efd8e31 2022-10-23 thomas #ifndef PROFILE
2040 414e37cb 2022-12-30 thomas if (pledge("stdio rpath recvfd unveil", NULL) == -1)
2041 3efd8e31 2022-10-23 thomas err(1, "pledge");
2043 7fed8fa4 2023-06-22 thomas apply_unveil_repo_readonly(repo_path, 0);
2044 6d7eb4f7 2023-04-04 thomas repo = gotd_find_repo_by_path(repo_path, &gotd);
2045 6d7eb4f7 2023-04-04 thomas if (repo == NULL)
2046 6d7eb4f7 2023-04-04 thomas fatalx("no repository for path %s", repo_path);
2047 6d7eb4f7 2023-04-04 thomas repo_write_main(title, repo_path, pack_fds, temp_fds,
2048 6d7eb4f7 2023-04-04 thomas &repo->protected_tag_namespaces,
2049 6d7eb4f7 2023-04-04 thomas &repo->protected_branch_namespaces,
2050 6d7eb4f7 2023-04-04 thomas &repo->protected_branches);
2051 3efd8e31 2022-10-23 thomas /* NOTREACHED */
2052 3efd8e31 2022-10-23 thomas exit(0);
2053 3efd8e31 2022-10-23 thomas default:
2054 3efd8e31 2022-10-23 thomas fatal("invalid process id %d", proc_id);
2057 3efd8e31 2022-10-23 thomas if (proc_id != PROC_GOTD)
2058 3efd8e31 2022-10-23 thomas fatal("invalid process id %d", proc_id);
2060 2c8fb90b 2023-06-25 thomas evtimer_set(&gotd.listen_proc->tmo, kill_proc_timeout,
2061 2c8fb90b 2023-06-25 thomas gotd.listen_proc);
2063 62ee7d94 2023-01-10 thomas apply_unveil_selfexec();
2065 3efd8e31 2022-10-23 thomas signal_set(&evsigint, SIGINT, gotd_sighdlr, NULL);
2066 3efd8e31 2022-10-23 thomas signal_set(&evsigterm, SIGTERM, gotd_sighdlr, NULL);
2067 3efd8e31 2022-10-23 thomas signal_set(&evsighup, SIGHUP, gotd_sighdlr, NULL);
2068 3efd8e31 2022-10-23 thomas signal_set(&evsigusr1, SIGUSR1, gotd_sighdlr, NULL);
2069 2c8fb90b 2023-06-25 thomas signal_set(&evsigchld, SIGCHLD, gotd_sighdlr, NULL);
2070 3efd8e31 2022-10-23 thomas signal(SIGPIPE, SIG_IGN);
2072 3efd8e31 2022-10-23 thomas signal_add(&evsigint, NULL);
2073 3efd8e31 2022-10-23 thomas signal_add(&evsigterm, NULL);
2074 3efd8e31 2022-10-23 thomas signal_add(&evsighup, NULL);
2075 3efd8e31 2022-10-23 thomas signal_add(&evsigusr1, NULL);
2076 2c8fb90b 2023-06-25 thomas signal_add(&evsigchld, NULL);
2078 78943464 2023-06-22 thomas gotd_imsg_event_add(&gotd.listen_proc->iev);
2080 3efd8e31 2022-10-23 thomas event_dispatch();
2082 3efd8e31 2022-10-23 thomas free(repo_path);
2083 62ee7d94 2023-01-10 thomas gotd_shutdown();
2085 3efd8e31 2022-10-23 thomas return 0;
