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 3efd8e31 2022-10-23 thomas #include <sys/queue.h>
18 3efd8e31 2022-10-23 thomas #include <sys/time.h>
19 3efd8e31 2022-10-23 thomas #include <sys/types.h>
20 3efd8e31 2022-10-23 thomas #include <sys/stat.h>
21 3efd8e31 2022-10-23 thomas #include <sys/socket.h>
22 3efd8e31 2022-10-23 thomas #include <sys/un.h>
23 3efd8e31 2022-10-23 thomas #include <sys/wait.h>
25 3efd8e31 2022-10-23 thomas #include <fcntl.h>
26 3efd8e31 2022-10-23 thomas #include <err.h>
27 3efd8e31 2022-10-23 thomas #include <errno.h>
28 3efd8e31 2022-10-23 thomas #include <event.h>
29 3efd8e31 2022-10-23 thomas #include <limits.h>
30 3efd8e31 2022-10-23 thomas #include <pwd.h>
31 3efd8e31 2022-10-23 thomas #include <imsg.h>
32 3efd8e31 2022-10-23 thomas #include <signal.h>
33 3efd8e31 2022-10-23 thomas #include <siphash.h>
34 3efd8e31 2022-10-23 thomas #include <stdarg.h>
35 3efd8e31 2022-10-23 thomas #include <stdio.h>
36 3efd8e31 2022-10-23 thomas #include <stdlib.h>
37 3efd8e31 2022-10-23 thomas #include <string.h>
38 3efd8e31 2022-10-23 thomas #include <syslog.h>
39 3efd8e31 2022-10-23 thomas #include <unistd.h>
41 3efd8e31 2022-10-23 thomas #include "got_error.h"
42 3efd8e31 2022-10-23 thomas #include "got_opentemp.h"
43 3efd8e31 2022-10-23 thomas #include "got_path.h"
44 3efd8e31 2022-10-23 thomas #include "got_repository.h"
45 3efd8e31 2022-10-23 thomas #include "got_object.h"
46 3efd8e31 2022-10-23 thomas #include "got_reference.h"
48 3efd8e31 2022-10-23 thomas #include "got_lib_delta.h"
49 3efd8e31 2022-10-23 thomas #include "got_lib_object.h"
50 3efd8e31 2022-10-23 thomas #include "got_lib_object_cache.h"
51 be288a59 2023-02-23 thomas #include "got_lib_hash.h"
52 3efd8e31 2022-10-23 thomas #include "got_lib_gitproto.h"
53 3efd8e31 2022-10-23 thomas #include "got_lib_pack.h"
54 3efd8e31 2022-10-23 thomas #include "got_lib_repository.h"
56 3efd8e31 2022-10-23 thomas #include "gotd.h"
57 3efd8e31 2022-10-23 thomas #include "log.h"
58 2b3d32a1 2022-12-30 thomas #include "listen.h"
59 729a7e24 2022-11-17 thomas #include "auth.h"
60 62ee7d94 2023-01-10 thomas #include "session.h"
61 3efd8e31 2022-10-23 thomas #include "repo_read.h"
62 3efd8e31 2022-10-23 thomas #include "repo_write.h"
64 3efd8e31 2022-10-23 thomas #ifndef nitems
65 3efd8e31 2022-10-23 thomas #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
68 7b1db75e 2023-01-14 thomas enum gotd_client_state {
69 7b1db75e 2023-01-14 thomas GOTD_CLIENT_STATE_NEW,
70 7b1db75e 2023-01-14 thomas GOTD_CLIENT_STATE_ACCESS_GRANTED,
73 78943464 2023-06-22 thomas struct gotd_child_proc {
74 78943464 2023-06-22 thomas pid_t pid;
75 78943464 2023-06-22 thomas enum gotd_procid type;
76 78943464 2023-06-22 thomas char repo_name[NAME_MAX];
77 78943464 2023-06-22 thomas char repo_path[PATH_MAX];
78 78943464 2023-06-22 thomas int pipe[2];
79 78943464 2023-06-22 thomas struct gotd_imsgev iev;
80 2c8fb90b 2023-06-25 thomas struct event tmo;
82 2c8fb90b 2023-06-25 thomas TAILQ_ENTRY(gotd_child_proc) entry;
84 2c8fb90b 2023-06-25 thomas TAILQ_HEAD(gotd_procs, gotd_child_proc) procs;
86 3efd8e31 2022-10-23 thomas struct gotd_client {
87 3efd8e31 2022-10-23 thomas STAILQ_ENTRY(gotd_client) entry;
88 3efd8e31 2022-10-23 thomas enum gotd_client_state state;
89 3efd8e31 2022-10-23 thomas uint32_t id;
91 3efd8e31 2022-10-23 thomas struct gotd_imsgev iev;
92 3efd8e31 2022-10-23 thomas struct event tmo;
93 3efd8e31 2022-10-23 thomas uid_t euid;
94 3efd8e31 2022-10-23 thomas gid_t egid;
95 27b11d77 2023-01-14 thomas struct gotd_child_proc *repo;
96 c669c489 2022-12-30 thomas struct gotd_child_proc *auth;
97 62ee7d94 2023-01-10 thomas struct gotd_child_proc *session;
98 c669c489 2022-12-30 thomas int required_auth;
100 3efd8e31 2022-10-23 thomas STAILQ_HEAD(gotd_clients, gotd_client);
102 3efd8e31 2022-10-23 thomas static struct gotd_clients gotd_clients[GOTD_CLIENT_TABLE_SIZE];
103 3efd8e31 2022-10-23 thomas static SIPHASH_KEY clients_hash_key;
104 3efd8e31 2022-10-23 thomas volatile int client_cnt;
105 95ef3f8a 2022-12-30 thomas static struct timeval auth_timeout = { 5, 0 };
106 3efd8e31 2022-10-23 thomas static struct gotd gotd;
108 3efd8e31 2022-10-23 thomas void gotd_sighdlr(int sig, short event, void *arg);
109 c902213d 2022-10-29 thomas static void gotd_shutdown(void);
110 62ee7d94 2023-01-10 thomas static const struct got_error *start_session_child(struct gotd_client *,
111 62ee7d94 2023-01-10 thomas struct gotd_repo *, char *, const char *, int, int);
112 85b37c72 2022-12-30 thomas static const struct got_error *start_repo_child(struct gotd_client *,
113 85b37c72 2022-12-30 thomas enum gotd_procid, struct gotd_repo *, char *, const char *, int, int);
114 c669c489 2022-12-30 thomas static const struct got_error *start_auth_child(struct gotd_client *, int,
115 c669c489 2022-12-30 thomas struct gotd_repo *, char *, const char *, int, int);
116 85b37c72 2022-12-30 thomas static void kill_proc(struct gotd_child_proc *, int);
117 2c8fb90b 2023-06-25 thomas static void disconnect(struct gotd_client *);
119 3efd8e31 2022-10-23 thomas __dead static void
120 96d694ac 2023-02-17 thomas usage(void)
122 c855c9f0 2023-01-19 thomas fprintf(stderr, "usage: %s [-dnv] [-f config-file]\n", getprogname());
126 3efd8e31 2022-10-23 thomas static int
127 3efd8e31 2022-10-23 thomas unix_socket_listen(const char *unix_socket_path, uid_t uid, gid_t gid)
129 3efd8e31 2022-10-23 thomas struct sockaddr_un sun;
130 3efd8e31 2022-10-23 thomas int fd = -1;
131 3efd8e31 2022-10-23 thomas mode_t old_umask, mode;
133 3efd8e31 2022-10-23 thomas fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK| SOCK_CLOEXEC, 0);
134 3efd8e31 2022-10-23 thomas if (fd == -1) {
135 3efd8e31 2022-10-23 thomas log_warn("socket");
136 3efd8e31 2022-10-23 thomas return -1;
139 3efd8e31 2022-10-23 thomas sun.sun_family = AF_UNIX;
140 3efd8e31 2022-10-23 thomas if (strlcpy(sun.sun_path, unix_socket_path,
141 3efd8e31 2022-10-23 thomas sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
142 3efd8e31 2022-10-23 thomas log_warnx("%s: name too long", unix_socket_path);
143 3efd8e31 2022-10-23 thomas close(fd);
144 3efd8e31 2022-10-23 thomas return -1;
147 3efd8e31 2022-10-23 thomas if (unlink(unix_socket_path) == -1) {
148 3efd8e31 2022-10-23 thomas if (errno != ENOENT) {
149 3efd8e31 2022-10-23 thomas log_warn("unlink %s", unix_socket_path);
150 3efd8e31 2022-10-23 thomas close(fd);
151 3efd8e31 2022-10-23 thomas return -1;
155 3efd8e31 2022-10-23 thomas old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
156 f2fc8ce0 2023-01-06 thomas mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
158 3efd8e31 2022-10-23 thomas if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
159 3efd8e31 2022-10-23 thomas log_warn("bind: %s", unix_socket_path);
160 3efd8e31 2022-10-23 thomas close(fd);
161 3efd8e31 2022-10-23 thomas umask(old_umask);
162 3efd8e31 2022-10-23 thomas return -1;
165 3efd8e31 2022-10-23 thomas umask(old_umask);
167 3efd8e31 2022-10-23 thomas if (chmod(unix_socket_path, mode) == -1) {
168 3efd8e31 2022-10-23 thomas log_warn("chmod %o %s", mode, unix_socket_path);
169 3efd8e31 2022-10-23 thomas close(fd);
170 3efd8e31 2022-10-23 thomas unlink(unix_socket_path);
171 3efd8e31 2022-10-23 thomas return -1;
174 3efd8e31 2022-10-23 thomas if (chown(unix_socket_path, uid, gid) == -1) {
175 3efd8e31 2022-10-23 thomas log_warn("chown %s uid=%d gid=%d", unix_socket_path, uid, gid);
176 3efd8e31 2022-10-23 thomas close(fd);
177 3efd8e31 2022-10-23 thomas unlink(unix_socket_path);
178 3efd8e31 2022-10-23 thomas return -1;
181 3efd8e31 2022-10-23 thomas if (listen(fd, GOTD_UNIX_SOCKET_BACKLOG) == -1) {
182 3efd8e31 2022-10-23 thomas log_warn("listen");
183 3efd8e31 2022-10-23 thomas close(fd);
184 3efd8e31 2022-10-23 thomas unlink(unix_socket_path);
185 3efd8e31 2022-10-23 thomas return -1;
188 3efd8e31 2022-10-23 thomas return fd;
191 3efd8e31 2022-10-23 thomas static uint64_t
192 3efd8e31 2022-10-23 thomas client_hash(uint32_t client_id)
194 3efd8e31 2022-10-23 thomas return SipHash24(&clients_hash_key, &client_id, sizeof(client_id));
197 3efd8e31 2022-10-23 thomas static void
198 3efd8e31 2022-10-23 thomas add_client(struct gotd_client *client)
200 3efd8e31 2022-10-23 thomas uint64_t slot = client_hash(client->id) % nitems(gotd_clients);
201 3efd8e31 2022-10-23 thomas STAILQ_INSERT_HEAD(&gotd_clients[slot], client, entry);
202 3efd8e31 2022-10-23 thomas client_cnt++;
205 3efd8e31 2022-10-23 thomas static struct gotd_client *
206 3efd8e31 2022-10-23 thomas find_client(uint32_t client_id)
208 3efd8e31 2022-10-23 thomas uint64_t slot;
209 3efd8e31 2022-10-23 thomas struct gotd_client *c;
211 3efd8e31 2022-10-23 thomas slot = client_hash(client_id) % nitems(gotd_clients);
212 3efd8e31 2022-10-23 thomas STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
213 3efd8e31 2022-10-23 thomas if (c->id == client_id)
214 3efd8e31 2022-10-23 thomas return c;
217 3efd8e31 2022-10-23 thomas return NULL;
220 85b37c72 2022-12-30 thomas static struct gotd_client *
221 85b37c72 2022-12-30 thomas find_client_by_proc_fd(int fd)
223 85b37c72 2022-12-30 thomas uint64_t slot;
225 85b37c72 2022-12-30 thomas for (slot = 0; slot < nitems(gotd_clients); slot++) {
226 85b37c72 2022-12-30 thomas struct gotd_client *c;
228 85b37c72 2022-12-30 thomas STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
229 27b11d77 2023-01-14 thomas if (c->repo && c->repo->iev.ibuf.fd == fd)
230 85b37c72 2022-12-30 thomas return c;
231 c669c489 2022-12-30 thomas if (c->auth && c->auth->iev.ibuf.fd == fd)
232 62ee7d94 2023-01-10 thomas return c;
233 62ee7d94 2023-01-10 thomas if (c->session && c->session->iev.ibuf.fd == fd)
234 c669c489 2022-12-30 thomas return c;
238 3efd8e31 2022-10-23 thomas return NULL;
241 3efd8e31 2022-10-23 thomas static int
242 3efd8e31 2022-10-23 thomas client_is_reading(struct gotd_client *client)
244 27b11d77 2023-01-14 thomas return (client->required_auth &
245 27b11d77 2023-01-14 thomas (GOTD_AUTH_READ | GOTD_AUTH_WRITE)) == GOTD_AUTH_READ;
248 3efd8e31 2022-10-23 thomas static int
249 3efd8e31 2022-10-23 thomas client_is_writing(struct gotd_client *client)
251 27b11d77 2023-01-14 thomas return (client->required_auth &
252 27b11d77 2023-01-14 thomas (GOTD_AUTH_READ | GOTD_AUTH_WRITE)) ==
253 27b11d77 2023-01-14 thomas (GOTD_AUTH_READ | GOTD_AUTH_WRITE);
256 3efd8e31 2022-10-23 thomas static const struct got_error *
257 3efd8e31 2022-10-23 thomas ensure_client_is_not_writing(struct gotd_client *client)
259 3efd8e31 2022-10-23 thomas if (client_is_writing(client)) {
260 3efd8e31 2022-10-23 thomas return got_error_fmt(GOT_ERR_BAD_PACKET,
261 3efd8e31 2022-10-23 thomas "uid %d made a read-request but is writing to "
262 3efd8e31 2022-10-23 thomas "a repository", client->euid);
265 3efd8e31 2022-10-23 thomas return NULL;
268 3efd8e31 2022-10-23 thomas static const struct got_error *
269 3efd8e31 2022-10-23 thomas ensure_client_is_not_reading(struct gotd_client *client)
271 3efd8e31 2022-10-23 thomas if (client_is_reading(client)) {
272 3efd8e31 2022-10-23 thomas return got_error_fmt(GOT_ERR_BAD_PACKET,
273 3efd8e31 2022-10-23 thomas "uid %d made a write-request but is reading from "
274 3efd8e31 2022-10-23 thomas "a repository", client->euid);
277 3efd8e31 2022-10-23 thomas return NULL;
280 85b37c72 2022-12-30 thomas static void
281 2c8fb90b 2023-06-25 thomas proc_done(struct gotd_child_proc *proc)
283 2c8fb90b 2023-06-25 thomas struct gotd_client *client;
285 2c8fb90b 2023-06-25 thomas TAILQ_REMOVE(&procs, proc, entry);
287 2c8fb90b 2023-06-25 thomas client = find_client_by_proc_fd(proc->iev.ibuf.fd);
288 2c8fb90b 2023-06-25 thomas if (client != NULL) {
289 2c8fb90b 2023-06-25 thomas if (proc == client->repo)
290 2c8fb90b 2023-06-25 thomas client->repo = NULL;
291 2c8fb90b 2023-06-25 thomas if (proc == client->auth)
292 2c8fb90b 2023-06-25 thomas client->auth = NULL;
293 2c8fb90b 2023-06-25 thomas if (proc == client->session)
294 2c8fb90b 2023-06-25 thomas client->session = NULL;
295 2c8fb90b 2023-06-25 thomas disconnect(client);
298 2c8fb90b 2023-06-25 thomas evtimer_del(&proc->tmo);
300 2c8fb90b 2023-06-25 thomas if (proc->iev.ibuf.fd != -1) {
301 2c8fb90b 2023-06-25 thomas event_del(&proc->iev.ev);
302 2c8fb90b 2023-06-25 thomas msgbuf_clear(&proc->iev.ibuf.w);
303 2c8fb90b 2023-06-25 thomas close(proc->iev.ibuf.fd);
306 62ee7d94 2023-01-10 thomas free(proc);
309 b993e8cc 2023-06-22 thomas static void
310 b993e8cc 2023-06-22 thomas kill_repo_proc(struct gotd_client *client)
312 b993e8cc 2023-06-22 thomas if (client->repo == NULL)
315 2c8fb90b 2023-06-25 thomas kill_proc(client->repo, 0);
316 b993e8cc 2023-06-22 thomas client->repo = NULL;
319 3efd8e31 2022-10-23 thomas static void
320 c669c489 2022-12-30 thomas kill_auth_proc(struct gotd_client *client)
322 c669c489 2022-12-30 thomas if (client->auth == NULL)
325 2c8fb90b 2023-06-25 thomas kill_proc(client->auth, 0);
326 c669c489 2022-12-30 thomas client->auth = NULL;
329 c669c489 2022-12-30 thomas static void
330 62ee7d94 2023-01-10 thomas kill_session_proc(struct gotd_client *client)
332 62ee7d94 2023-01-10 thomas if (client->session == NULL)
335 2c8fb90b 2023-06-25 thomas kill_proc(client->session, 0);
336 62ee7d94 2023-01-10 thomas client->session = NULL;
339 62ee7d94 2023-01-10 thomas static void
340 3efd8e31 2022-10-23 thomas disconnect(struct gotd_client *client)
342 3efd8e31 2022-10-23 thomas struct gotd_imsg_disconnect idisconnect;
343 78943464 2023-06-22 thomas struct gotd_child_proc *listen_proc = gotd.listen_proc;
344 3efd8e31 2022-10-23 thomas uint64_t slot;
346 3efd8e31 2022-10-23 thomas log_debug("uid %d: disconnecting", client->euid);
348 c669c489 2022-12-30 thomas kill_auth_proc(client);
349 62ee7d94 2023-01-10 thomas kill_session_proc(client);
350 b993e8cc 2023-06-22 thomas kill_repo_proc(client);
352 52939b68 2023-02-17 thomas idisconnect.client_id = client->id;
353 2b3d32a1 2022-12-30 thomas if (gotd_imsg_compose_event(&listen_proc->iev,
354 2b3d32a1 2022-12-30 thomas GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
355 2b3d32a1 2022-12-30 thomas &idisconnect, sizeof(idisconnect)) == -1)
356 2b3d32a1 2022-12-30 thomas log_warn("imsg compose DISCONNECT");
358 3efd8e31 2022-10-23 thomas slot = client_hash(client->id) % nitems(gotd_clients);
359 3efd8e31 2022-10-23 thomas STAILQ_REMOVE(&gotd_clients[slot], client, gotd_client, entry);
360 3efd8e31 2022-10-23 thomas imsg_clear(&client->iev.ibuf);
361 3efd8e31 2022-10-23 thomas event_del(&client->iev.ev);
362 3efd8e31 2022-10-23 thomas evtimer_del(&client->tmo);
363 62ee7d94 2023-01-10 thomas if (client->fd != -1)
364 62ee7d94 2023-01-10 thomas close(client->fd);
365 62ee7d94 2023-01-10 thomas else if (client->iev.ibuf.fd != -1)
366 62ee7d94 2023-01-10 thomas close(client->iev.ibuf.fd);
367 3efd8e31 2022-10-23 thomas free(client);
368 3efd8e31 2022-10-23 thomas client_cnt--;
371 3efd8e31 2022-10-23 thomas static void
372 3efd8e31 2022-10-23 thomas disconnect_on_error(struct gotd_client *client, const struct got_error *err)
374 3efd8e31 2022-10-23 thomas struct imsgbuf ibuf;
376 3efd8e31 2022-10-23 thomas log_warnx("uid %d: %s", client->euid, err->msg);
377 62ee7d94 2023-01-10 thomas if (err->code != GOT_ERR_EOF && client->fd != -1) {
378 3efd8e31 2022-10-23 thomas imsg_init(&ibuf, client->fd);
379 3efd8e31 2022-10-23 thomas gotd_imsg_send_error(&ibuf, 0, PROC_GOTD, err);
380 3efd8e31 2022-10-23 thomas imsg_clear(&ibuf);
382 3efd8e31 2022-10-23 thomas disconnect(client);
385 c902213d 2022-10-29 thomas static const struct got_error *
386 c902213d 2022-10-29 thomas send_repo_info(struct gotd_imsgev *iev, struct gotd_repo *repo)
388 c902213d 2022-10-29 thomas const struct got_error *err = NULL;
389 c902213d 2022-10-29 thomas struct gotd_imsg_info_repo irepo;
391 c902213d 2022-10-29 thomas memset(&irepo, 0, sizeof(irepo));
393 c902213d 2022-10-29 thomas if (strlcpy(irepo.repo_name, repo->name, sizeof(irepo.repo_name))
394 c902213d 2022-10-29 thomas >= sizeof(irepo.repo_name))
395 c902213d 2022-10-29 thomas return got_error_msg(GOT_ERR_NO_SPACE, "repo name too long");
396 c902213d 2022-10-29 thomas if (strlcpy(irepo.repo_path, repo->path, sizeof(irepo.repo_path))
397 c902213d 2022-10-29 thomas >= sizeof(irepo.repo_path))
398 c902213d 2022-10-29 thomas return got_error_msg(GOT_ERR_NO_SPACE, "repo path too long");
400 c902213d 2022-10-29 thomas if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_REPO, PROC_GOTD, -1,
401 c902213d 2022-10-29 thomas &irepo, sizeof(irepo)) == -1) {
402 c902213d 2022-10-29 thomas err = got_error_from_errno("imsg compose INFO_REPO");
404 c902213d 2022-10-29 thomas return err;
407 c902213d 2022-10-29 thomas return NULL;
410 c902213d 2022-10-29 thomas static const struct got_error *
411 c902213d 2022-10-29 thomas send_client_info(struct gotd_imsgev *iev, struct gotd_client *client)
413 c902213d 2022-10-29 thomas const struct got_error *err = NULL;
414 c902213d 2022-10-29 thomas struct gotd_imsg_info_client iclient;
415 c902213d 2022-10-29 thomas struct gotd_child_proc *proc;
417 c902213d 2022-10-29 thomas memset(&iclient, 0, sizeof(iclient));
418 c902213d 2022-10-29 thomas iclient.euid = client->euid;
419 c902213d 2022-10-29 thomas iclient.egid = client->egid;
421 27b11d77 2023-01-14 thomas proc = client->repo;
422 c902213d 2022-10-29 thomas if (proc) {
423 414e37cb 2022-12-30 thomas if (strlcpy(iclient.repo_name, proc->repo_path,
424 c902213d 2022-10-29 thomas sizeof(iclient.repo_name)) >= sizeof(iclient.repo_name)) {
425 c902213d 2022-10-29 thomas return got_error_msg(GOT_ERR_NO_SPACE,
426 c902213d 2022-10-29 thomas "repo name too long");
428 c902213d 2022-10-29 thomas if (client_is_writing(client))
429 c902213d 2022-10-29 thomas iclient.is_writing = 1;
431 62ee7d94 2023-01-10 thomas iclient.repo_child_pid = proc->pid;
434 62ee7d94 2023-01-10 thomas if (client->session)
435 62ee7d94 2023-01-10 thomas iclient.session_child_pid = client->session->pid;
437 c902213d 2022-10-29 thomas if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_CLIENT, PROC_GOTD, -1,
438 c902213d 2022-10-29 thomas &iclient, sizeof(iclient)) == -1) {
439 c902213d 2022-10-29 thomas err = got_error_from_errno("imsg compose INFO_CLIENT");
441 c902213d 2022-10-29 thomas return err;
444 c902213d 2022-10-29 thomas return NULL;
447 c902213d 2022-10-29 thomas static const struct got_error *
448 c902213d 2022-10-29 thomas send_info(struct gotd_client *client)
450 c902213d 2022-10-29 thomas const struct got_error *err = NULL;
451 c902213d 2022-10-29 thomas struct gotd_imsg_info info;
452 c902213d 2022-10-29 thomas uint64_t slot;
453 c902213d 2022-10-29 thomas struct gotd_repo *repo;
455 c8cf6821 2023-01-06 thomas if (client->euid != 0)
456 c8cf6821 2023-01-06 thomas return got_error_set_errno(EPERM, "info");
458 c902213d 2022-10-29 thomas info.pid = gotd.pid;
459 c902213d 2022-10-29 thomas info.verbosity = gotd.verbosity;
460 c902213d 2022-10-29 thomas info.nrepos = gotd.nrepos;
461 c902213d 2022-10-29 thomas info.nclients = client_cnt - 1;
463 c902213d 2022-10-29 thomas if (gotd_imsg_compose_event(&client->iev, GOTD_IMSG_INFO, PROC_GOTD, -1,
464 c902213d 2022-10-29 thomas &info, sizeof(info)) == -1) {
465 c902213d 2022-10-29 thomas err = got_error_from_errno("imsg compose INFO");
467 c902213d 2022-10-29 thomas return err;
470 c902213d 2022-10-29 thomas TAILQ_FOREACH(repo, &gotd.repos, entry) {
471 c902213d 2022-10-29 thomas err = send_repo_info(&client->iev, repo);
473 c902213d 2022-10-29 thomas return err;
476 c902213d 2022-10-29 thomas for (slot = 0; slot < nitems(gotd_clients); slot++) {
477 c902213d 2022-10-29 thomas struct gotd_client *c;
478 c902213d 2022-10-29 thomas STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
479 c902213d 2022-10-29 thomas if (c->id == client->id)
480 c902213d 2022-10-29 thomas continue;
481 c902213d 2022-10-29 thomas err = send_client_info(&client->iev, c);
483 c902213d 2022-10-29 thomas return err;
487 c902213d 2022-10-29 thomas return NULL;
490 c902213d 2022-10-29 thomas static const struct got_error *
491 c902213d 2022-10-29 thomas stop_gotd(struct gotd_client *client)
494 c902213d 2022-10-29 thomas if (client->euid != 0)
495 c902213d 2022-10-29 thomas return got_error_set_errno(EPERM, "stop");
497 c902213d 2022-10-29 thomas gotd_shutdown();
498 c902213d 2022-10-29 thomas /* NOTREACHED */
499 729a7e24 2022-11-17 thomas return NULL;
502 3efd8e31 2022-10-23 thomas static const struct got_error *
503 62ee7d94 2023-01-10 thomas start_client_authentication(struct gotd_client *client, struct imsg *imsg)
505 3efd8e31 2022-10-23 thomas const struct got_error *err;
506 3efd8e31 2022-10-23 thomas struct gotd_imsg_list_refs ireq;
507 729a7e24 2022-11-17 thomas struct gotd_repo *repo = NULL;
508 3efd8e31 2022-10-23 thomas size_t datalen;
510 3efd8e31 2022-10-23 thomas log_debug("list-refs request from uid %d", client->euid);
512 7b1db75e 2023-01-14 thomas if (client->state != GOTD_CLIENT_STATE_NEW)
513 62ee7d94 2023-01-10 thomas return got_error_msg(GOT_ERR_BAD_REQUEST,
514 62ee7d94 2023-01-10 thomas "unexpected list-refs request received");
516 3efd8e31 2022-10-23 thomas datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
517 3efd8e31 2022-10-23 thomas if (datalen != sizeof(ireq))
518 3efd8e31 2022-10-23 thomas return got_error(GOT_ERR_PRIVSEP_LEN);
520 3efd8e31 2022-10-23 thomas memcpy(&ireq, imsg->data, datalen);
522 3efd8e31 2022-10-23 thomas if (ireq.client_is_reading) {
523 3efd8e31 2022-10-23 thomas err = ensure_client_is_not_writing(client);
525 3efd8e31 2022-10-23 thomas return err;
526 5dcb3a43 2023-04-01 thomas repo = gotd_find_repo_by_name(ireq.repo_name, &gotd);
527 729a7e24 2022-11-17 thomas if (repo == NULL)
528 729a7e24 2022-11-17 thomas return got_error(GOT_ERR_NOT_GIT_REPO);
529 c669c489 2022-12-30 thomas err = start_auth_child(client, GOTD_AUTH_READ, repo,
530 85b37c72 2022-12-30 thomas gotd.argv0, gotd.confpath, gotd.daemonize,
531 85b37c72 2022-12-30 thomas gotd.verbosity);
533 85b37c72 2022-12-30 thomas return err;
535 3efd8e31 2022-10-23 thomas err = ensure_client_is_not_reading(client);
537 729a7e24 2022-11-17 thomas return err;
538 5dcb3a43 2023-04-01 thomas repo = gotd_find_repo_by_name(ireq.repo_name, &gotd);
539 729a7e24 2022-11-17 thomas if (repo == NULL)
540 729a7e24 2022-11-17 thomas return got_error(GOT_ERR_NOT_GIT_REPO);
541 c669c489 2022-12-30 thomas err = start_auth_child(client,
542 c669c489 2022-12-30 thomas GOTD_AUTH_READ | GOTD_AUTH_WRITE,
543 c669c489 2022-12-30 thomas repo, gotd.argv0, gotd.confpath, gotd.daemonize,
544 85b37c72 2022-12-30 thomas gotd.verbosity);
546 85b37c72 2022-12-30 thomas return err;
549 62ee7d94 2023-01-10 thomas evtimer_add(&client->tmo, &auth_timeout);
551 f7abcac2 2023-07-17 thomas /* Flow continues upon authentication success/failure or timeout. */
552 3efd8e31 2022-10-23 thomas return NULL;
555 3efd8e31 2022-10-23 thomas static void
556 3efd8e31 2022-10-23 thomas gotd_request(int fd, short events, void *arg)
558 3efd8e31 2022-10-23 thomas struct gotd_imsgev *iev = arg;
559 3efd8e31 2022-10-23 thomas struct imsgbuf *ibuf = &iev->ibuf;
560 3efd8e31 2022-10-23 thomas struct gotd_client *client = iev->handler_arg;
561 3efd8e31 2022-10-23 thomas const struct got_error *err = NULL;
562 3efd8e31 2022-10-23 thomas struct imsg imsg;
563 3efd8e31 2022-10-23 thomas ssize_t n;
565 3efd8e31 2022-10-23 thomas if (events & EV_WRITE) {
566 3efd8e31 2022-10-23 thomas while (ibuf->w.queued) {
567 3efd8e31 2022-10-23 thomas n = msgbuf_write(&ibuf->w);
568 3efd8e31 2022-10-23 thomas if (n == -1 && errno == EPIPE) {
570 3efd8e31 2022-10-23 thomas * The client has closed its socket.
571 3efd8e31 2022-10-23 thomas * This can happen when Git clients are
572 3efd8e31 2022-10-23 thomas * done sending pack file data.
574 3efd8e31 2022-10-23 thomas msgbuf_clear(&ibuf->w);
575 3efd8e31 2022-10-23 thomas continue;
576 3efd8e31 2022-10-23 thomas } else if (n == -1 && errno != EAGAIN) {
577 3efd8e31 2022-10-23 thomas err = got_error_from_errno("imsg_flush");
578 3efd8e31 2022-10-23 thomas disconnect_on_error(client, err);
581 3efd8e31 2022-10-23 thomas if (n == 0) {
582 3efd8e31 2022-10-23 thomas /* Connection closed. */
583 3efd8e31 2022-10-23 thomas err = got_error(GOT_ERR_EOF);
584 3efd8e31 2022-10-23 thomas disconnect_on_error(client, err);
589 c902213d 2022-10-29 thomas /* Disconnect gotctl(8) now that messages have been sent. */
590 c902213d 2022-10-29 thomas if (!client_is_reading(client) && !client_is_writing(client)) {
591 c902213d 2022-10-29 thomas disconnect(client);
596 3efd8e31 2022-10-23 thomas if ((events & EV_READ) == 0)
599 3efd8e31 2022-10-23 thomas memset(&imsg, 0, sizeof(imsg));
601 3efd8e31 2022-10-23 thomas while (err == NULL) {
602 3efd8e31 2022-10-23 thomas err = gotd_imsg_recv(&imsg, ibuf, 0);
603 3efd8e31 2022-10-23 thomas if (err) {
604 3efd8e31 2022-10-23 thomas if (err->code == GOT_ERR_PRIVSEP_READ)
605 3efd8e31 2022-10-23 thomas err = NULL;
609 3efd8e31 2022-10-23 thomas evtimer_del(&client->tmo);
611 3efd8e31 2022-10-23 thomas switch (imsg.hdr.type) {
612 c902213d 2022-10-29 thomas case GOTD_IMSG_INFO:
613 c902213d 2022-10-29 thomas err = send_info(client);
615 c902213d 2022-10-29 thomas case GOTD_IMSG_STOP:
616 c902213d 2022-10-29 thomas err = stop_gotd(client);
618 3efd8e31 2022-10-23 thomas case GOTD_IMSG_LIST_REFS:
619 62ee7d94 2023-01-10 thomas err = start_client_authentication(client, &imsg);
622 62ee7d94 2023-01-10 thomas log_debug("unexpected imsg %d", imsg.hdr.type);
623 3efd8e31 2022-10-23 thomas err = got_error(GOT_ERR_PRIVSEP_MSG);
627 3efd8e31 2022-10-23 thomas imsg_free(&imsg);
630 3efd8e31 2022-10-23 thomas if (err) {
631 f5f71a04 2023-01-23 thomas disconnect_on_error(client, err);
633 3efd8e31 2022-10-23 thomas gotd_imsg_event_add(&client->iev);
637 3efd8e31 2022-10-23 thomas static void
638 62ee7d94 2023-01-10 thomas gotd_auth_timeout(int fd, short events, void *arg)
640 3efd8e31 2022-10-23 thomas struct gotd_client *client = arg;
642 62ee7d94 2023-01-10 thomas log_debug("disconnecting uid %d due to authentication timeout",
643 62ee7d94 2023-01-10 thomas client->euid);
644 3efd8e31 2022-10-23 thomas disconnect(client);
647 2b3d32a1 2022-12-30 thomas static const struct got_error *
648 2b3d32a1 2022-12-30 thomas recv_connect(uint32_t *client_id, struct imsg *imsg)
650 2b3d32a1 2022-12-30 thomas const struct got_error *err = NULL;
651 2b3d32a1 2022-12-30 thomas struct gotd_imsg_connect iconnect;
652 2b3d32a1 2022-12-30 thomas size_t datalen;
653 3efd8e31 2022-10-23 thomas int s = -1;
654 3efd8e31 2022-10-23 thomas struct gotd_client *client = NULL;
656 2b3d32a1 2022-12-30 thomas *client_id = 0;
658 2b3d32a1 2022-12-30 thomas datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
659 2b3d32a1 2022-12-30 thomas if (datalen != sizeof(iconnect))
660 2b3d32a1 2022-12-30 thomas return got_error(GOT_ERR_PRIVSEP_LEN);
661 2b3d32a1 2022-12-30 thomas memcpy(&iconnect, imsg->data, sizeof(iconnect));
663 2b3d32a1 2022-12-30 thomas s = imsg->fd;
664 3efd8e31 2022-10-23 thomas if (s == -1) {
665 2b3d32a1 2022-12-30 thomas err = got_error(GOT_ERR_PRIVSEP_NO_FD);
666 2b3d32a1 2022-12-30 thomas goto done;
669 2b3d32a1 2022-12-30 thomas if (find_client(iconnect.client_id)) {
670 2b3d32a1 2022-12-30 thomas err = got_error_msg(GOT_ERR_CLIENT_ID, "duplicate client ID");
671 2b3d32a1 2022-12-30 thomas goto done;
674 3efd8e31 2022-10-23 thomas client = calloc(1, sizeof(*client));
675 3efd8e31 2022-10-23 thomas if (client == NULL) {
676 2b3d32a1 2022-12-30 thomas err = got_error_from_errno("calloc");
677 2b3d32a1 2022-12-30 thomas goto done;
680 2b3d32a1 2022-12-30 thomas *client_id = iconnect.client_id;
682 7b1db75e 2023-01-14 thomas client->state = GOTD_CLIENT_STATE_NEW;
683 2b3d32a1 2022-12-30 thomas client->id = iconnect.client_id;
684 3efd8e31 2022-10-23 thomas client->fd = s;
686 0bcde4c8 2022-12-30 thomas /* The auth process will verify UID/GID for us. */
687 0bcde4c8 2022-12-30 thomas client->euid = iconnect.euid;
688 0bcde4c8 2022-12-30 thomas client->egid = iconnect.egid;
690 3efd8e31 2022-10-23 thomas imsg_init(&client->iev.ibuf, client->fd);
691 3efd8e31 2022-10-23 thomas client->iev.handler = gotd_request;
692 3efd8e31 2022-10-23 thomas client->iev.events = EV_READ;
693 3efd8e31 2022-10-23 thomas client->iev.handler_arg = client;
695 3efd8e31 2022-10-23 thomas event_set(&client->iev.ev, client->fd, EV_READ, gotd_request,
696 3efd8e31 2022-10-23 thomas &client->iev);
697 3efd8e31 2022-10-23 thomas gotd_imsg_event_add(&client->iev);
699 62ee7d94 2023-01-10 thomas evtimer_set(&client->tmo, gotd_auth_timeout, client);
701 3efd8e31 2022-10-23 thomas add_client(client);
702 3efd8e31 2022-10-23 thomas log_debug("%s: new client uid %d connected on fd %d", __func__,
703 3efd8e31 2022-10-23 thomas client->euid, client->fd);
705 2b3d32a1 2022-12-30 thomas if (err) {
706 78943464 2023-06-22 thomas struct gotd_child_proc *listen_proc = gotd.listen_proc;
707 2b3d32a1 2022-12-30 thomas struct gotd_imsg_disconnect idisconnect;
709 2b3d32a1 2022-12-30 thomas idisconnect.client_id = client->id;
710 2b3d32a1 2022-12-30 thomas if (gotd_imsg_compose_event(&listen_proc->iev,
711 2b3d32a1 2022-12-30 thomas GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
712 2b3d32a1 2022-12-30 thomas &idisconnect, sizeof(idisconnect)) == -1)
713 2b3d32a1 2022-12-30 thomas log_warn("imsg compose DISCONNECT");
715 2b3d32a1 2022-12-30 thomas if (s != -1)
716 2b3d32a1 2022-12-30 thomas close(s);
719 2b3d32a1 2022-12-30 thomas return err;
722 3efd8e31 2022-10-23 thomas static const char *gotd_proc_names[PROC_MAX] = {
723 3efd8e31 2022-10-23 thomas "parent",
724 2b3d32a1 2022-12-30 thomas "listen",
726 844dda16 2023-06-22 thomas "session_read",
727 844dda16 2023-06-22 thomas "session_write",
728 3efd8e31 2022-10-23 thomas "repo_read",
729 f3807fe5 2023-07-10 thomas "repo_write",
730 f3807fe5 2023-07-10 thomas "gitwrapper"
733 3efd8e31 2022-10-23 thomas static void
734 3efd8e31 2022-10-23 thomas kill_proc(struct gotd_child_proc *proc, int fatal)
736 2c8fb90b 2023-06-25 thomas struct timeval tv = { 5, 0 };
738 2c8fb90b 2023-06-25 thomas log_debug("kill -%d %d", fatal ? SIGKILL : SIGTERM, proc->pid);
740 2c8fb90b 2023-06-25 thomas if (proc->iev.ibuf.fd != -1) {
741 2c8fb90b 2023-06-25 thomas event_del(&proc->iev.ev);
742 2c8fb90b 2023-06-25 thomas msgbuf_clear(&proc->iev.ibuf.w);
743 2c8fb90b 2023-06-25 thomas close(proc->iev.ibuf.fd);
744 2c8fb90b 2023-06-25 thomas proc->iev.ibuf.fd = -1;
747 2c8fb90b 2023-06-25 thomas if (!evtimer_pending(&proc->tmo, NULL) && !fatal)
748 2c8fb90b 2023-06-25 thomas evtimer_add(&proc->tmo, &tv);
750 3efd8e31 2022-10-23 thomas if (fatal) {
751 3efd8e31 2022-10-23 thomas log_warnx("sending SIGKILL to PID %d", proc->pid);
752 3efd8e31 2022-10-23 thomas kill(proc->pid, SIGKILL);
754 3efd8e31 2022-10-23 thomas kill(proc->pid, SIGTERM);
757 3efd8e31 2022-10-23 thomas static void
758 2c8fb90b 2023-06-25 thomas kill_proc_timeout(int fd, short ev, void *d)
760 2c8fb90b 2023-06-25 thomas struct gotd_child_proc *proc = d;
762 2c8fb90b 2023-06-25 thomas log_warnx("timeout waiting for PID %d to terminate;"
763 2c8fb90b 2023-06-25 thomas " retrying with force", proc->pid);
764 2c8fb90b 2023-06-25 thomas kill_proc(proc, 1);
767 2c8fb90b 2023-06-25 thomas static void
768 3efd8e31 2022-10-23 thomas gotd_shutdown(void)
770 85b37c72 2022-12-30 thomas uint64_t slot;
772 62ee7d94 2023-01-10 thomas log_debug("shutting down");
773 85b37c72 2022-12-30 thomas for (slot = 0; slot < nitems(gotd_clients); slot++) {
774 85b37c72 2022-12-30 thomas struct gotd_client *c, *tmp;
776 85b37c72 2022-12-30 thomas STAILQ_FOREACH_SAFE(c, &gotd_clients[slot], entry, tmp)
777 85b37c72 2022-12-30 thomas disconnect(c);
780 2c8fb90b 2023-06-25 thomas kill_proc(gotd.listen_proc, 0);
782 3efd8e31 2022-10-23 thomas log_info("terminating");
786 2c8fb90b 2023-06-25 thomas static struct gotd_child_proc *
787 2c8fb90b 2023-06-25 thomas find_proc_by_pid(pid_t pid)
789 2c8fb90b 2023-06-25 thomas struct gotd_child_proc *proc = NULL;
791 2c8fb90b 2023-06-25 thomas TAILQ_FOREACH(proc, &procs, entry)
792 2c8fb90b 2023-06-25 thomas if (proc->pid == pid)
795 2c8fb90b 2023-06-25 thomas return proc;
799 3efd8e31 2022-10-23 thomas gotd_sighdlr(int sig, short event, void *arg)
801 2c8fb90b 2023-06-25 thomas struct gotd_child_proc *proc;
802 2c8fb90b 2023-06-25 thomas pid_t pid;
803 2c8fb90b 2023-06-25 thomas int status;
806 3efd8e31 2022-10-23 thomas * Normal signal handler rules don't apply because libevent
807 3efd8e31 2022-10-23 thomas * decouples for us.
810 3efd8e31 2022-10-23 thomas switch (sig) {
811 3efd8e31 2022-10-23 thomas case SIGHUP:
812 3efd8e31 2022-10-23 thomas log_info("%s: ignoring SIGHUP", __func__);
814 3efd8e31 2022-10-23 thomas case SIGUSR1:
815 3efd8e31 2022-10-23 thomas log_info("%s: ignoring SIGUSR1", __func__);
817 3efd8e31 2022-10-23 thomas case SIGTERM:
818 3efd8e31 2022-10-23 thomas case SIGINT:
819 3efd8e31 2022-10-23 thomas gotd_shutdown();
821 2c8fb90b 2023-06-25 thomas case SIGCHLD:
822 2c8fb90b 2023-06-25 thomas for (;;) {
823 2c8fb90b 2023-06-25 thomas pid = waitpid(WAIT_ANY, &status, WNOHANG);
824 2c8fb90b 2023-06-25 thomas if (pid == -1) {
825 2c8fb90b 2023-06-25 thomas if (errno == EINTR)
826 2c8fb90b 2023-06-25 thomas continue;
827 2c8fb90b 2023-06-25 thomas if (errno == ECHILD)
829 2c8fb90b 2023-06-25 thomas fatal("waitpid");
831 2c8fb90b 2023-06-25 thomas if (pid == 0)
834 2c8fb90b 2023-06-25 thomas log_debug("reaped pid %d", pid);
835 2c8fb90b 2023-06-25 thomas proc = find_proc_by_pid(pid);
836 2c8fb90b 2023-06-25 thomas if (proc == NULL) {
837 2c8fb90b 2023-06-25 thomas log_info("caught exit of unknown child %d",
839 2c8fb90b 2023-06-25 thomas continue;
842 2c8fb90b 2023-06-25 thomas if (WIFSIGNALED(status)) {
843 2c8fb90b 2023-06-25 thomas log_warnx("child PID %d terminated with"
844 2c8fb90b 2023-06-25 thomas " signal %d", pid, WTERMSIG(status));
847 2c8fb90b 2023-06-25 thomas proc_done(proc);
851 3efd8e31 2022-10-23 thomas fatalx("unexpected signal");
855 3efd8e31 2022-10-23 thomas static const struct got_error *
856 3efd8e31 2022-10-23 thomas ensure_proc_is_reading(struct gotd_client *client,
857 3efd8e31 2022-10-23 thomas struct gotd_child_proc *proc)
859 3efd8e31 2022-10-23 thomas if (!client_is_reading(client)) {
860 3efd8e31 2022-10-23 thomas kill_proc(proc, 1);
861 3efd8e31 2022-10-23 thomas return got_error_fmt(GOT_ERR_BAD_PACKET,
862 3efd8e31 2022-10-23 thomas "PID %d handled a read-request for uid %d but this "
863 3efd8e31 2022-10-23 thomas "user is not reading from a repository", proc->pid,
864 3efd8e31 2022-10-23 thomas client->euid);
867 3efd8e31 2022-10-23 thomas return NULL;
870 3efd8e31 2022-10-23 thomas static const struct got_error *
871 3efd8e31 2022-10-23 thomas ensure_proc_is_writing(struct gotd_client *client,
872 3efd8e31 2022-10-23 thomas struct gotd_child_proc *proc)
874 3efd8e31 2022-10-23 thomas if (!client_is_writing(client)) {
875 3efd8e31 2022-10-23 thomas kill_proc(proc, 1);
876 3efd8e31 2022-10-23 thomas return got_error_fmt(GOT_ERR_BAD_PACKET,
877 3efd8e31 2022-10-23 thomas "PID %d handled a write-request for uid %d but this "
878 3efd8e31 2022-10-23 thomas "user is not writing to a repository", proc->pid,
879 3efd8e31 2022-10-23 thomas client->euid);
882 3efd8e31 2022-10-23 thomas return NULL;
885 3efd8e31 2022-10-23 thomas static int
886 3efd8e31 2022-10-23 thomas verify_imsg_src(struct gotd_client *client, struct gotd_child_proc *proc,
887 3efd8e31 2022-10-23 thomas struct imsg *imsg)
889 3efd8e31 2022-10-23 thomas const struct got_error *err;
890 3efd8e31 2022-10-23 thomas int ret = 0;
892 2b3d32a1 2022-12-30 thomas if (proc->type == PROC_REPO_READ || proc->type == PROC_REPO_WRITE) {
893 27b11d77 2023-01-14 thomas if (client->repo == NULL)
894 2b3d32a1 2022-12-30 thomas fatalx("no process found for uid %d", client->euid);
895 27b11d77 2023-01-14 thomas if (proc->pid != client->repo->pid) {
896 2b3d32a1 2022-12-30 thomas kill_proc(proc, 1);
897 2b3d32a1 2022-12-30 thomas log_warnx("received message from PID %d for uid %d, "
898 2b3d32a1 2022-12-30 thomas "while PID %d is the process serving this user",
899 27b11d77 2023-01-14 thomas proc->pid, client->euid, client->repo->pid);
900 2b3d32a1 2022-12-30 thomas return 0;
903 7fed8fa4 2023-06-22 thomas if (proc->type == PROC_SESSION_READ ||
904 7fed8fa4 2023-06-22 thomas proc->type == PROC_SESSION_WRITE) {
905 62ee7d94 2023-01-10 thomas if (client->session == NULL) {
906 62ee7d94 2023-01-10 thomas log_warnx("no session found for uid %d", client->euid);
907 62ee7d94 2023-01-10 thomas return 0;
909 62ee7d94 2023-01-10 thomas if (proc->pid != client->session->pid) {
910 62ee7d94 2023-01-10 thomas kill_proc(proc, 1);
911 62ee7d94 2023-01-10 thomas log_warnx("received message from PID %d for uid %d, "
912 62ee7d94 2023-01-10 thomas "while PID %d is the process serving this user",
913 62ee7d94 2023-01-10 thomas proc->pid, client->euid, client->session->pid);
914 62ee7d94 2023-01-10 thomas return 0;
918 3efd8e31 2022-10-23 thomas switch (imsg->hdr.type) {
919 3efd8e31 2022-10-23 thomas case GOTD_IMSG_ERROR:
922 2b3d32a1 2022-12-30 thomas case GOTD_IMSG_CONNECT:
923 2b3d32a1 2022-12-30 thomas if (proc->type != PROC_LISTEN) {
924 2b3d32a1 2022-12-30 thomas err = got_error_fmt(GOT_ERR_BAD_PACKET,
925 2b3d32a1 2022-12-30 thomas "new connection for uid %d from PID %d "
926 2b3d32a1 2022-12-30 thomas "which is not the listen process",
927 c669c489 2022-12-30 thomas proc->pid, client->euid);
931 c669c489 2022-12-30 thomas case GOTD_IMSG_ACCESS_GRANTED:
932 c669c489 2022-12-30 thomas if (proc->type != PROC_AUTH) {
933 c669c489 2022-12-30 thomas err = got_error_fmt(GOT_ERR_BAD_PACKET,
934 c669c489 2022-12-30 thomas "authentication of uid %d from PID %d "
935 c669c489 2022-12-30 thomas "which is not the auth process",
936 2b3d32a1 2022-12-30 thomas proc->pid, client->euid);
940 62ee7d94 2023-01-10 thomas case GOTD_IMSG_CLIENT_SESSION_READY:
941 7fed8fa4 2023-06-22 thomas if (proc->type != PROC_SESSION_READ &&
942 7fed8fa4 2023-06-22 thomas proc->type != PROC_SESSION_WRITE) {
943 62ee7d94 2023-01-10 thomas err = got_error_fmt(GOT_ERR_BAD_PACKET,
944 62ee7d94 2023-01-10 thomas "unexpected \"ready\" signal from PID %d",
945 62ee7d94 2023-01-10 thomas proc->pid);
949 85b37c72 2022-12-30 thomas case GOTD_IMSG_REPO_CHILD_READY:
950 85b37c72 2022-12-30 thomas if (proc->type != PROC_REPO_READ &&
951 85b37c72 2022-12-30 thomas proc->type != PROC_REPO_WRITE) {
952 85b37c72 2022-12-30 thomas err = got_error_fmt(GOT_ERR_BAD_PACKET,
953 85b37c72 2022-12-30 thomas "unexpected \"ready\" signal from PID %d",
954 85b37c72 2022-12-30 thomas proc->pid);
958 3efd8e31 2022-10-23 thomas case GOTD_IMSG_PACKFILE_DONE:
959 3efd8e31 2022-10-23 thomas err = ensure_proc_is_reading(client, proc);
961 3efd8e31 2022-10-23 thomas log_warnx("uid %d: %s", client->euid, err->msg);
965 3efd8e31 2022-10-23 thomas case GOTD_IMSG_PACKFILE_INSTALL:
966 3efd8e31 2022-10-23 thomas case GOTD_IMSG_REF_UPDATES_START:
967 3efd8e31 2022-10-23 thomas case GOTD_IMSG_REF_UPDATE:
968 3efd8e31 2022-10-23 thomas err = ensure_proc_is_writing(client, proc);
970 3efd8e31 2022-10-23 thomas log_warnx("uid %d: %s", client->euid, err->msg);
975 3efd8e31 2022-10-23 thomas log_debug("%s: unexpected imsg %d", __func__, imsg->hdr.type);
979 3efd8e31 2022-10-23 thomas return ret;
982 3efd8e31 2022-10-23 thomas static const struct got_error *
983 62ee7d94 2023-01-10 thomas connect_repo_child(struct gotd_client *client,
984 62ee7d94 2023-01-10 thomas struct gotd_child_proc *repo_proc)
986 85b37c72 2022-12-30 thomas static const struct got_error *err;
987 62ee7d94 2023-01-10 thomas struct gotd_imsgev *session_iev = &client->session->iev;
988 62ee7d94 2023-01-10 thomas struct gotd_imsg_connect_repo_child ireq;
989 62ee7d94 2023-01-10 thomas int pipe[2];
991 7b1db75e 2023-01-14 thomas if (client->state != GOTD_CLIENT_STATE_ACCESS_GRANTED)
992 62ee7d94 2023-01-10 thomas return got_error_msg(GOT_ERR_BAD_REQUEST,
993 62ee7d94 2023-01-10 thomas "unexpected repo child ready signal received");
995 62ee7d94 2023-01-10 thomas if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
996 62ee7d94 2023-01-10 thomas PF_UNSPEC, pipe) == -1)
997 62ee7d94 2023-01-10 thomas fatal("socketpair");
999 62ee7d94 2023-01-10 thomas memset(&ireq, 0, sizeof(ireq));
1000 62ee7d94 2023-01-10 thomas ireq.client_id = client->id;
1001 62ee7d94 2023-01-10 thomas ireq.proc_id = repo_proc->type;
1003 62ee7d94 2023-01-10 thomas /* Pass repo child pipe to session child process. */
1004 62ee7d94 2023-01-10 thomas if (gotd_imsg_compose_event(session_iev, GOTD_IMSG_CONNECT_REPO_CHILD,
1005 62ee7d94 2023-01-10 thomas PROC_GOTD, pipe[0], &ireq, sizeof(ireq)) == -1) {
1006 62ee7d94 2023-01-10 thomas err = got_error_from_errno("imsg compose CONNECT_REPO_CHILD");
1007 62ee7d94 2023-01-10 thomas close(pipe[0]);
1008 62ee7d94 2023-01-10 thomas close(pipe[1]);
1009 62ee7d94 2023-01-10 thomas return err;
1012 62ee7d94 2023-01-10 thomas /* Pass session child pipe to repo child process. */
1013 62ee7d94 2023-01-10 thomas if (gotd_imsg_compose_event(&repo_proc->iev,
1014 62ee7d94 2023-01-10 thomas GOTD_IMSG_CONNECT_REPO_CHILD, PROC_GOTD, pipe[1], NULL, 0) == -1) {
1015 62ee7d94 2023-01-10 thomas err = got_error_from_errno("imsg compose CONNECT_REPO_CHILD");
1016 62ee7d94 2023-01-10 thomas close(pipe[1]);
1017 62ee7d94 2023-01-10 thomas return err;
1020 3efd8e31 2022-10-23 thomas return NULL;
1023 3efd8e31 2022-10-23 thomas static void
1024 85b37c72 2022-12-30 thomas gotd_dispatch_listener(int fd, short event, void *arg)
1026 3efd8e31 2022-10-23 thomas struct gotd_imsgev *iev = arg;
1027 3efd8e31 2022-10-23 thomas struct imsgbuf *ibuf = &iev->ibuf;
1028 78943464 2023-06-22 thomas struct gotd_child_proc *proc = gotd.listen_proc;
1029 85b37c72 2022-12-30 thomas ssize_t n;
1030 85b37c72 2022-12-30 thomas int shut = 0;
1031 85b37c72 2022-12-30 thomas struct imsg imsg;
1033 85b37c72 2022-12-30 thomas if (proc->iev.ibuf.fd != fd)
1034 85b37c72 2022-12-30 thomas fatalx("%s: unexpected fd %d", __func__, fd);
1036 85b37c72 2022-12-30 thomas if (event & EV_READ) {
1037 85b37c72 2022-12-30 thomas if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1038 85b37c72 2022-12-30 thomas fatal("imsg_read error");
1039 85b37c72 2022-12-30 thomas if (n == 0) {
1040 85b37c72 2022-12-30 thomas /* Connection closed. */
1041 85b37c72 2022-12-30 thomas shut = 1;
1042 85b37c72 2022-12-30 thomas goto done;
1046 85b37c72 2022-12-30 thomas if (event & EV_WRITE) {
1047 85b37c72 2022-12-30 thomas n = msgbuf_write(&ibuf->w);
1048 85b37c72 2022-12-30 thomas if (n == -1 && errno != EAGAIN)
1049 85b37c72 2022-12-30 thomas fatal("msgbuf_write");
1050 85b37c72 2022-12-30 thomas if (n == 0) {
1051 85b37c72 2022-12-30 thomas /* Connection closed. */
1052 85b37c72 2022-12-30 thomas shut = 1;
1053 85b37c72 2022-12-30 thomas goto done;
1057 85b37c72 2022-12-30 thomas for (;;) {
1058 85b37c72 2022-12-30 thomas const struct got_error *err = NULL;
1059 85b37c72 2022-12-30 thomas struct gotd_client *client = NULL;
1060 85b37c72 2022-12-30 thomas uint32_t client_id = 0;
1061 85b37c72 2022-12-30 thomas int do_disconnect = 0;
1063 85b37c72 2022-12-30 thomas if ((n = imsg_get(ibuf, &imsg)) == -1)
1064 85b37c72 2022-12-30 thomas fatal("%s: imsg_get error", __func__);
1065 85b37c72 2022-12-30 thomas if (n == 0) /* No more messages. */
1068 85b37c72 2022-12-30 thomas switch (imsg.hdr.type) {
1069 85b37c72 2022-12-30 thomas case GOTD_IMSG_ERROR:
1070 85b37c72 2022-12-30 thomas do_disconnect = 1;
1071 85b37c72 2022-12-30 thomas err = gotd_imsg_recv_error(&client_id, &imsg);
1073 85b37c72 2022-12-30 thomas case GOTD_IMSG_CONNECT:
1074 85b37c72 2022-12-30 thomas err = recv_connect(&client_id, &imsg);
1076 85b37c72 2022-12-30 thomas default:
1077 85b37c72 2022-12-30 thomas log_debug("unexpected imsg %d", imsg.hdr.type);
1081 85b37c72 2022-12-30 thomas client = find_client(client_id);
1082 85b37c72 2022-12-30 thomas if (client == NULL) {
1083 85b37c72 2022-12-30 thomas log_warnx("%s: client not found", __func__);
1084 85b37c72 2022-12-30 thomas imsg_free(&imsg);
1085 85b37c72 2022-12-30 thomas continue;
1088 85b37c72 2022-12-30 thomas if (err)
1089 85b37c72 2022-12-30 thomas log_warnx("uid %d: %s", client->euid, err->msg);
1091 85b37c72 2022-12-30 thomas if (do_disconnect) {
1092 85b37c72 2022-12-30 thomas if (err)
1093 85b37c72 2022-12-30 thomas disconnect_on_error(client, err);
1095 85b37c72 2022-12-30 thomas disconnect(client);
1098 85b37c72 2022-12-30 thomas imsg_free(&imsg);
1101 85b37c72 2022-12-30 thomas if (!shut) {
1102 85b37c72 2022-12-30 thomas gotd_imsg_event_add(iev);
1103 85b37c72 2022-12-30 thomas } else {
1104 85b37c72 2022-12-30 thomas /* This pipe is dead. Remove its event handler */
1105 85b37c72 2022-12-30 thomas event_del(&iev->ev);
1106 85b37c72 2022-12-30 thomas event_loopexit(NULL);
1110 85b37c72 2022-12-30 thomas static void
1111 c669c489 2022-12-30 thomas gotd_dispatch_auth_child(int fd, short event, void *arg)
1113 c669c489 2022-12-30 thomas const struct got_error *err = NULL;
1114 c669c489 2022-12-30 thomas struct gotd_imsgev *iev = arg;
1115 c669c489 2022-12-30 thomas struct imsgbuf *ibuf = &iev->ibuf;
1116 c669c489 2022-12-30 thomas struct gotd_client *client;
1117 c669c489 2022-12-30 thomas struct gotd_repo *repo = NULL;
1118 c669c489 2022-12-30 thomas ssize_t n;
1119 c669c489 2022-12-30 thomas int shut = 0;
1120 c669c489 2022-12-30 thomas struct imsg imsg;
1121 c669c489 2022-12-30 thomas uint32_t client_id = 0;
1122 c669c489 2022-12-30 thomas int do_disconnect = 0;
1124 c669c489 2022-12-30 thomas client = find_client_by_proc_fd(fd);
1125 b7acbe65 2023-02-17 thomas if (client == NULL) {
1126 b7acbe65 2023-02-17 thomas /* Can happen during process teardown. */
1127 b7acbe65 2023-02-17 thomas warnx("cannot find client for fd %d", fd);
1128 b7acbe65 2023-02-17 thomas shut = 1;
1129 b7acbe65 2023-02-17 thomas goto done;
1132 c669c489 2022-12-30 thomas if (client->auth == NULL)
1133 c669c489 2022-12-30 thomas fatalx("cannot find auth child process for fd %d", fd);
1135 c669c489 2022-12-30 thomas if (event & EV_READ) {
1136 c669c489 2022-12-30 thomas if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1137 c669c489 2022-12-30 thomas fatal("imsg_read error");
1138 c669c489 2022-12-30 thomas if (n == 0) {
1139 c669c489 2022-12-30 thomas /* Connection closed. */
1140 c669c489 2022-12-30 thomas shut = 1;
1141 c669c489 2022-12-30 thomas goto done;
1145 c669c489 2022-12-30 thomas if (event & EV_WRITE) {
1146 c669c489 2022-12-30 thomas n = msgbuf_write(&ibuf->w);
1147 c669c489 2022-12-30 thomas if (n == -1 && errno != EAGAIN)
1148 c669c489 2022-12-30 thomas fatal("msgbuf_write");
1149 c669c489 2022-12-30 thomas if (n == 0) {
1150 c669c489 2022-12-30 thomas /* Connection closed. */
1151 c669c489 2022-12-30 thomas shut = 1;
1153 c669c489 2022-12-30 thomas goto done;
1156 c669c489 2022-12-30 thomas if (client->auth->iev.ibuf.fd != fd)
1157 c669c489 2022-12-30 thomas fatalx("%s: unexpected fd %d", __func__, fd);
1159 c669c489 2022-12-30 thomas if ((n = imsg_get(ibuf, &imsg)) == -1)
1160 c669c489 2022-12-30 thomas fatal("%s: imsg_get error", __func__);
1161 c669c489 2022-12-30 thomas if (n == 0) /* No more messages. */
1164 c669c489 2022-12-30 thomas evtimer_del(&client->tmo);
1166 c669c489 2022-12-30 thomas switch (imsg.hdr.type) {
1167 c669c489 2022-12-30 thomas case GOTD_IMSG_ERROR:
1168 c669c489 2022-12-30 thomas do_disconnect = 1;
1169 c669c489 2022-12-30 thomas err = gotd_imsg_recv_error(&client_id, &imsg);
1171 c669c489 2022-12-30 thomas case GOTD_IMSG_ACCESS_GRANTED:
1172 7b1db75e 2023-01-14 thomas client->state = GOTD_CLIENT_STATE_ACCESS_GRANTED;
1174 c669c489 2022-12-30 thomas default:
1175 c669c489 2022-12-30 thomas do_disconnect = 1;
1176 c669c489 2022-12-30 thomas log_debug("unexpected imsg %d", imsg.hdr.type);
1180 c669c489 2022-12-30 thomas if (!verify_imsg_src(client, client->auth, &imsg)) {
1181 c669c489 2022-12-30 thomas do_disconnect = 1;
1182 c669c489 2022-12-30 thomas log_debug("dropping imsg type %d from PID %d",
1183 c669c489 2022-12-30 thomas imsg.hdr.type, client->auth->pid);
1185 c669c489 2022-12-30 thomas imsg_free(&imsg);
1187 c669c489 2022-12-30 thomas if (do_disconnect) {
1188 c669c489 2022-12-30 thomas if (err)
1189 c669c489 2022-12-30 thomas disconnect_on_error(client, err);
1191 c669c489 2022-12-30 thomas disconnect(client);
1195 5dcb3a43 2023-04-01 thomas repo = gotd_find_repo_by_name(client->auth->repo_name, &gotd);
1196 c669c489 2022-12-30 thomas if (repo == NULL) {
1197 c669c489 2022-12-30 thomas err = got_error(GOT_ERR_NOT_GIT_REPO);
1198 c669c489 2022-12-30 thomas goto done;
1200 c669c489 2022-12-30 thomas kill_auth_proc(client);
1202 e17294f7 2023-01-27 thomas log_info("authenticated uid %d for repository %s",
1203 c669c489 2022-12-30 thomas client->euid, repo->name);
1205 62ee7d94 2023-01-10 thomas err = start_session_child(client, repo, gotd.argv0,
1206 46ecc01f 2022-12-30 thomas gotd.confpath, gotd.daemonize, gotd.verbosity);
1207 62ee7d94 2023-01-10 thomas if (err)
1208 62ee7d94 2023-01-10 thomas goto done;
1210 c669c489 2022-12-30 thomas if (err)
1211 c669c489 2022-12-30 thomas log_warnx("uid %d: %s", client->euid, err->msg);
1213 c669c489 2022-12-30 thomas /* We might have killed the auth process by now. */
1214 c669c489 2022-12-30 thomas if (client->auth != NULL) {
1215 c669c489 2022-12-30 thomas if (!shut) {
1216 c669c489 2022-12-30 thomas gotd_imsg_event_add(iev);
1217 c669c489 2022-12-30 thomas } else {
1218 c669c489 2022-12-30 thomas /* This pipe is dead. Remove its event handler */
1219 c669c489 2022-12-30 thomas event_del(&iev->ev);
1224 62ee7d94 2023-01-10 thomas static const struct got_error *
1225 62ee7d94 2023-01-10 thomas connect_session(struct gotd_client *client)
1227 62ee7d94 2023-01-10 thomas const struct got_error *err = NULL;
1228 62ee7d94 2023-01-10 thomas struct gotd_imsg_connect iconnect;
1231 62ee7d94 2023-01-10 thomas memset(&iconnect, 0, sizeof(iconnect));
1233 62ee7d94 2023-01-10 thomas s = dup(client->fd);
1234 62ee7d94 2023-01-10 thomas if (s == -1)
1235 62ee7d94 2023-01-10 thomas return got_error_from_errno("dup");
1237 62ee7d94 2023-01-10 thomas iconnect.client_id = client->id;
1238 62ee7d94 2023-01-10 thomas iconnect.euid = client->euid;
1239 62ee7d94 2023-01-10 thomas iconnect.egid = client->egid;
1241 62ee7d94 2023-01-10 thomas if (gotd_imsg_compose_event(&client->session->iev, GOTD_IMSG_CONNECT,
1242 62ee7d94 2023-01-10 thomas PROC_GOTD, s, &iconnect, sizeof(iconnect)) == -1) {
1243 62ee7d94 2023-01-10 thomas err = got_error_from_errno("imsg compose CONNECT");
1244 62ee7d94 2023-01-10 thomas close(s);
1245 62ee7d94 2023-01-10 thomas return err;
1249 62ee7d94 2023-01-10 thomas * We are no longer interested in messages from this client.
1250 62ee7d94 2023-01-10 thomas * Further client requests will be handled by the session process.
1252 62ee7d94 2023-01-10 thomas msgbuf_clear(&client->iev.ibuf.w);
1253 62ee7d94 2023-01-10 thomas imsg_clear(&client->iev.ibuf);
1254 62ee7d94 2023-01-10 thomas event_del(&client->iev.ev);
1255 62ee7d94 2023-01-10 thomas client->fd = -1; /* will be closed via copy in client->iev.ibuf.fd */
1257 62ee7d94 2023-01-10 thomas return NULL;
1260 c669c489 2022-12-30 thomas static void
1261 62ee7d94 2023-01-10 thomas gotd_dispatch_client_session(int fd, short event, void *arg)
1263 85b37c72 2022-12-30 thomas struct gotd_imsgev *iev = arg;
1264 85b37c72 2022-12-30 thomas struct imsgbuf *ibuf = &iev->ibuf;
1265 3efd8e31 2022-10-23 thomas struct gotd_child_proc *proc = NULL;
1266 85b37c72 2022-12-30 thomas struct gotd_client *client = NULL;
1267 3efd8e31 2022-10-23 thomas ssize_t n;
1268 3efd8e31 2022-10-23 thomas int shut = 0;
1269 3efd8e31 2022-10-23 thomas struct imsg imsg;
1271 62ee7d94 2023-01-10 thomas client = find_client_by_proc_fd(fd);
1272 b7acbe65 2023-02-17 thomas if (client == NULL) {
1273 b7acbe65 2023-02-17 thomas /* Can happen during process teardown. */
1274 b7acbe65 2023-02-17 thomas warnx("cannot find client for fd %d", fd);
1275 b7acbe65 2023-02-17 thomas shut = 1;
1276 b7acbe65 2023-02-17 thomas goto done;
1279 3efd8e31 2022-10-23 thomas if (event & EV_READ) {
1280 3efd8e31 2022-10-23 thomas if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1281 3efd8e31 2022-10-23 thomas fatal("imsg_read error");
1282 3efd8e31 2022-10-23 thomas if (n == 0) {
1283 3efd8e31 2022-10-23 thomas /* Connection closed. */
1284 3efd8e31 2022-10-23 thomas shut = 1;
1285 3efd8e31 2022-10-23 thomas goto done;
1289 3efd8e31 2022-10-23 thomas if (event & EV_WRITE) {
1290 3efd8e31 2022-10-23 thomas n = msgbuf_write(&ibuf->w);
1291 3efd8e31 2022-10-23 thomas if (n == -1 && errno != EAGAIN)
1292 3efd8e31 2022-10-23 thomas fatal("msgbuf_write");
1293 3efd8e31 2022-10-23 thomas if (n == 0) {
1294 3efd8e31 2022-10-23 thomas /* Connection closed. */
1295 3efd8e31 2022-10-23 thomas shut = 1;
1296 3efd8e31 2022-10-23 thomas goto done;
1300 62ee7d94 2023-01-10 thomas proc = client->session;
1301 62ee7d94 2023-01-10 thomas if (proc == NULL)
1302 62ee7d94 2023-01-10 thomas fatalx("cannot find session child process for fd %d", fd);
1304 62ee7d94 2023-01-10 thomas for (;;) {
1305 62ee7d94 2023-01-10 thomas const struct got_error *err = NULL;
1306 62ee7d94 2023-01-10 thomas uint32_t client_id = 0;
1307 62ee7d94 2023-01-10 thomas int do_disconnect = 0, do_start_repo_child = 0;
1309 62ee7d94 2023-01-10 thomas if ((n = imsg_get(ibuf, &imsg)) == -1)
1310 62ee7d94 2023-01-10 thomas fatal("%s: imsg_get error", __func__);
1311 62ee7d94 2023-01-10 thomas if (n == 0) /* No more messages. */
1314 62ee7d94 2023-01-10 thomas switch (imsg.hdr.type) {
1315 62ee7d94 2023-01-10 thomas case GOTD_IMSG_ERROR:
1316 62ee7d94 2023-01-10 thomas do_disconnect = 1;
1317 62ee7d94 2023-01-10 thomas err = gotd_imsg_recv_error(&client_id, &imsg);
1319 62ee7d94 2023-01-10 thomas case GOTD_IMSG_CLIENT_SESSION_READY:
1320 7b1db75e 2023-01-14 thomas if (client->state != GOTD_CLIENT_STATE_ACCESS_GRANTED) {
1321 62ee7d94 2023-01-10 thomas err = got_error(GOT_ERR_PRIVSEP_MSG);
1324 62ee7d94 2023-01-10 thomas do_start_repo_child = 1;
1326 62ee7d94 2023-01-10 thomas case GOTD_IMSG_DISCONNECT:
1327 62ee7d94 2023-01-10 thomas do_disconnect = 1;
1329 62ee7d94 2023-01-10 thomas default:
1330 62ee7d94 2023-01-10 thomas log_debug("unexpected imsg %d", imsg.hdr.type);
1334 62ee7d94 2023-01-10 thomas if (!verify_imsg_src(client, proc, &imsg)) {
1335 62ee7d94 2023-01-10 thomas log_debug("dropping imsg type %d from PID %d",
1336 62ee7d94 2023-01-10 thomas imsg.hdr.type, proc->pid);
1337 62ee7d94 2023-01-10 thomas imsg_free(&imsg);
1338 62ee7d94 2023-01-10 thomas continue;
1340 62ee7d94 2023-01-10 thomas if (err)
1341 62ee7d94 2023-01-10 thomas log_warnx("uid %d: %s", client->euid, err->msg);
1343 62ee7d94 2023-01-10 thomas if (do_start_repo_child) {
1344 62ee7d94 2023-01-10 thomas struct gotd_repo *repo;
1345 5dcb3a43 2023-04-01 thomas const char *name = client->session->repo_name;
1347 5dcb3a43 2023-04-01 thomas repo = gotd_find_repo_by_name(name, &gotd);
1348 62ee7d94 2023-01-10 thomas if (repo != NULL) {
1349 62ee7d94 2023-01-10 thomas enum gotd_procid proc_type;
1351 62ee7d94 2023-01-10 thomas if (client->required_auth & GOTD_AUTH_WRITE)
1352 62ee7d94 2023-01-10 thomas proc_type = PROC_REPO_WRITE;
1354 62ee7d94 2023-01-10 thomas proc_type = PROC_REPO_READ;
1356 62ee7d94 2023-01-10 thomas err = start_repo_child(client, proc_type, repo,
1357 62ee7d94 2023-01-10 thomas gotd.argv0, gotd.confpath, gotd.daemonize,
1358 62ee7d94 2023-01-10 thomas gotd.verbosity);
1360 62ee7d94 2023-01-10 thomas err = got_error(GOT_ERR_NOT_GIT_REPO);
1362 62ee7d94 2023-01-10 thomas if (err) {
1363 62ee7d94 2023-01-10 thomas log_warnx("uid %d: %s", client->euid, err->msg);
1364 62ee7d94 2023-01-10 thomas do_disconnect = 1;
1368 62ee7d94 2023-01-10 thomas if (do_disconnect) {
1369 62ee7d94 2023-01-10 thomas if (err)
1370 62ee7d94 2023-01-10 thomas disconnect_on_error(client, err);
1372 62ee7d94 2023-01-10 thomas disconnect(client);
1375 62ee7d94 2023-01-10 thomas imsg_free(&imsg);
1378 62ee7d94 2023-01-10 thomas if (!shut) {
1379 62ee7d94 2023-01-10 thomas gotd_imsg_event_add(iev);
1380 62ee7d94 2023-01-10 thomas } else {
1381 62ee7d94 2023-01-10 thomas /* This pipe is dead. Remove its event handler */
1382 62ee7d94 2023-01-10 thomas event_del(&iev->ev);
1383 62ee7d94 2023-01-10 thomas disconnect(client);
1387 62ee7d94 2023-01-10 thomas static void
1388 62ee7d94 2023-01-10 thomas gotd_dispatch_repo_child(int fd, short event, void *arg)
1390 62ee7d94 2023-01-10 thomas struct gotd_imsgev *iev = arg;
1391 62ee7d94 2023-01-10 thomas struct imsgbuf *ibuf = &iev->ibuf;
1392 62ee7d94 2023-01-10 thomas struct gotd_child_proc *proc = NULL;
1393 62ee7d94 2023-01-10 thomas struct gotd_client *client;
1394 62ee7d94 2023-01-10 thomas ssize_t n;
1395 62ee7d94 2023-01-10 thomas int shut = 0;
1396 62ee7d94 2023-01-10 thomas struct imsg imsg;
1398 85b37c72 2022-12-30 thomas client = find_client_by_proc_fd(fd);
1399 b7acbe65 2023-02-17 thomas if (client == NULL) {
1400 b7acbe65 2023-02-17 thomas /* Can happen during process teardown. */
1401 b7acbe65 2023-02-17 thomas warnx("cannot find client for fd %d", fd);
1402 b7acbe65 2023-02-17 thomas shut = 1;
1403 b7acbe65 2023-02-17 thomas goto done;
1406 62ee7d94 2023-01-10 thomas if (event & EV_READ) {
1407 62ee7d94 2023-01-10 thomas if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1408 62ee7d94 2023-01-10 thomas fatal("imsg_read error");
1409 62ee7d94 2023-01-10 thomas if (n == 0) {
1410 62ee7d94 2023-01-10 thomas /* Connection closed. */
1411 62ee7d94 2023-01-10 thomas shut = 1;
1412 62ee7d94 2023-01-10 thomas goto done;
1416 62ee7d94 2023-01-10 thomas if (event & EV_WRITE) {
1417 62ee7d94 2023-01-10 thomas n = msgbuf_write(&ibuf->w);
1418 62ee7d94 2023-01-10 thomas if (n == -1 && errno != EAGAIN)
1419 62ee7d94 2023-01-10 thomas fatal("msgbuf_write");
1420 62ee7d94 2023-01-10 thomas if (n == 0) {
1421 62ee7d94 2023-01-10 thomas /* Connection closed. */
1422 62ee7d94 2023-01-10 thomas shut = 1;
1423 62ee7d94 2023-01-10 thomas goto done;
1427 27b11d77 2023-01-14 thomas proc = client->repo;
1428 3efd8e31 2022-10-23 thomas if (proc == NULL)
1429 3efd8e31 2022-10-23 thomas fatalx("cannot find child process for fd %d", fd);
1431 3efd8e31 2022-10-23 thomas for (;;) {
1432 3efd8e31 2022-10-23 thomas const struct got_error *err = NULL;
1433 3efd8e31 2022-10-23 thomas uint32_t client_id = 0;
1434 3efd8e31 2022-10-23 thomas int do_disconnect = 0;
1436 3efd8e31 2022-10-23 thomas if ((n = imsg_get(ibuf, &imsg)) == -1)
1437 3efd8e31 2022-10-23 thomas fatal("%s: imsg_get error", __func__);
1438 3efd8e31 2022-10-23 thomas if (n == 0) /* No more messages. */
1441 3efd8e31 2022-10-23 thomas switch (imsg.hdr.type) {
1442 3efd8e31 2022-10-23 thomas case GOTD_IMSG_ERROR:
1443 3efd8e31 2022-10-23 thomas do_disconnect = 1;
1444 3efd8e31 2022-10-23 thomas err = gotd_imsg_recv_error(&client_id, &imsg);
1446 85b37c72 2022-12-30 thomas case GOTD_IMSG_REPO_CHILD_READY:
1447 62ee7d94 2023-01-10 thomas err = connect_session(client);
1448 62ee7d94 2023-01-10 thomas if (err)
1450 62ee7d94 2023-01-10 thomas err = connect_repo_child(client, proc);
1452 3efd8e31 2022-10-23 thomas default:
1453 3efd8e31 2022-10-23 thomas log_debug("unexpected imsg %d", imsg.hdr.type);
1457 3efd8e31 2022-10-23 thomas if (!verify_imsg_src(client, proc, &imsg)) {
1458 3efd8e31 2022-10-23 thomas log_debug("dropping imsg type %d from PID %d",
1459 3efd8e31 2022-10-23 thomas imsg.hdr.type, proc->pid);
1460 3efd8e31 2022-10-23 thomas imsg_free(&imsg);
1461 3efd8e31 2022-10-23 thomas continue;
1463 3efd8e31 2022-10-23 thomas if (err)
1464 3efd8e31 2022-10-23 thomas log_warnx("uid %d: %s", client->euid, err->msg);
1466 3efd8e31 2022-10-23 thomas if (do_disconnect) {
1467 3efd8e31 2022-10-23 thomas if (err)
1468 3efd8e31 2022-10-23 thomas disconnect_on_error(client, err);
1470 3efd8e31 2022-10-23 thomas disconnect(client);
1473 3efd8e31 2022-10-23 thomas imsg_free(&imsg);
1476 3efd8e31 2022-10-23 thomas if (!shut) {
1477 3efd8e31 2022-10-23 thomas gotd_imsg_event_add(iev);
1478 3efd8e31 2022-10-23 thomas } else {
1479 3efd8e31 2022-10-23 thomas /* This pipe is dead. Remove its event handler */
1480 3efd8e31 2022-10-23 thomas event_del(&iev->ev);
1481 62ee7d94 2023-01-10 thomas disconnect(client);
1485 3efd8e31 2022-10-23 thomas static pid_t
1486 414e37cb 2022-12-30 thomas start_child(enum gotd_procid proc_id, const char *repo_path,
1487 832b8374 2022-10-31 thomas char *argv0, const char *confpath, int fd, int daemonize, int verbosity)
1489 832b8374 2022-10-31 thomas char *argv[11];
1490 3efd8e31 2022-10-23 thomas int argc = 0;
1491 3efd8e31 2022-10-23 thomas pid_t pid;
1493 3efd8e31 2022-10-23 thomas switch (pid = fork()) {
1494 3efd8e31 2022-10-23 thomas case -1:
1495 3efd8e31 2022-10-23 thomas fatal("cannot fork");
1498 3efd8e31 2022-10-23 thomas default:
1499 3efd8e31 2022-10-23 thomas close(fd);
1500 3efd8e31 2022-10-23 thomas return pid;
1503 bb3a6ce9 2022-11-17 thomas if (fd != GOTD_FILENO_MSG_PIPE) {
1504 bb3a6ce9 2022-11-17 thomas if (dup2(fd, GOTD_FILENO_MSG_PIPE) == -1)
1505 3efd8e31 2022-10-23 thomas fatal("cannot setup imsg fd");
1506 3efd8e31 2022-10-23 thomas } else if (fcntl(fd, F_SETFD, 0) == -1)
1507 3efd8e31 2022-10-23 thomas fatal("cannot setup imsg fd");
1509 3efd8e31 2022-10-23 thomas argv[argc++] = argv0;
1510 3efd8e31 2022-10-23 thomas switch (proc_id) {
1511 2b3d32a1 2022-12-30 thomas case PROC_LISTEN:
1512 2b3d32a1 2022-12-30 thomas argv[argc++] = (char *)"-L";
1514 c669c489 2022-12-30 thomas case PROC_AUTH:
1515 c669c489 2022-12-30 thomas argv[argc++] = (char *)"-A";
1517 7fed8fa4 2023-06-22 thomas case PROC_SESSION_READ:
1518 7fed8fa4 2023-06-22 thomas argv[argc++] = (char *)"-s";
1520 7fed8fa4 2023-06-22 thomas case PROC_SESSION_WRITE:
1521 62ee7d94 2023-01-10 thomas argv[argc++] = (char *)"-S";
1523 3efd8e31 2022-10-23 thomas case PROC_REPO_READ:
1524 3efd8e31 2022-10-23 thomas argv[argc++] = (char *)"-R";
1526 3efd8e31 2022-10-23 thomas case PROC_REPO_WRITE:
1527 3efd8e31 2022-10-23 thomas argv[argc++] = (char *)"-W";
1529 3efd8e31 2022-10-23 thomas default:
1530 3efd8e31 2022-10-23 thomas fatalx("invalid process id %d", proc_id);
1533 832b8374 2022-10-31 thomas argv[argc++] = (char *)"-f";
1534 832b8374 2022-10-31 thomas argv[argc++] = (char *)confpath;
1536 414e37cb 2022-12-30 thomas if (repo_path) {
1537 2b3d32a1 2022-12-30 thomas argv[argc++] = (char *)"-P";
1538 414e37cb 2022-12-30 thomas argv[argc++] = (char *)repo_path;
1541 3efd8e31 2022-10-23 thomas if (!daemonize)
1542 3efd8e31 2022-10-23 thomas argv[argc++] = (char *)"-d";
1543 3efd8e31 2022-10-23 thomas if (verbosity > 0)
1544 3efd8e31 2022-10-23 thomas argv[argc++] = (char *)"-v";
1545 3efd8e31 2022-10-23 thomas if (verbosity > 1)
1546 3efd8e31 2022-10-23 thomas argv[argc++] = (char *)"-v";
1547 3efd8e31 2022-10-23 thomas argv[argc++] = NULL;
1549 3efd8e31 2022-10-23 thomas execvp(argv0, argv);
1550 3efd8e31 2022-10-23 thomas fatal("execvp");
1553 3efd8e31 2022-10-23 thomas static void
1554 2b3d32a1 2022-12-30 thomas start_listener(char *argv0, const char *confpath, int daemonize, int verbosity)
1556 78943464 2023-06-22 thomas struct gotd_child_proc *proc;
1558 78943464 2023-06-22 thomas proc = calloc(1, sizeof(*proc));
1559 78943464 2023-06-22 thomas if (proc == NULL)
1560 78943464 2023-06-22 thomas fatal("calloc");
1562 2c8fb90b 2023-06-25 thomas TAILQ_INSERT_HEAD(&procs, proc, entry);
1564 2c8fb90b 2023-06-25 thomas /* proc->tmo is initialized in main() after event_init() */
1566 2b3d32a1 2022-12-30 thomas proc->type = PROC_LISTEN;
1568 2b3d32a1 2022-12-30 thomas if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1569 2b3d32a1 2022-12-30 thomas PF_UNSPEC, proc->pipe) == -1)
1570 2b3d32a1 2022-12-30 thomas fatal("socketpair");
1572 2b3d32a1 2022-12-30 thomas proc->pid = start_child(proc->type, NULL, argv0, confpath,
1573 2b3d32a1 2022-12-30 thomas proc->pipe[1], daemonize, verbosity);
1574 2b3d32a1 2022-12-30 thomas imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1575 85b37c72 2022-12-30 thomas proc->iev.handler = gotd_dispatch_listener;
1576 2b3d32a1 2022-12-30 thomas proc->iev.events = EV_READ;
1577 2b3d32a1 2022-12-30 thomas proc->iev.handler_arg = NULL;
1579 78943464 2023-06-22 thomas gotd.listen_proc = proc;
1582 85b37c72 2022-12-30 thomas static const struct got_error *
1583 62ee7d94 2023-01-10 thomas start_session_child(struct gotd_client *client, struct gotd_repo *repo,
1584 62ee7d94 2023-01-10 thomas char *argv0, const char *confpath, int daemonize, int verbosity)
1586 62ee7d94 2023-01-10 thomas struct gotd_child_proc *proc;
1588 62ee7d94 2023-01-10 thomas proc = calloc(1, sizeof(*proc));
1589 62ee7d94 2023-01-10 thomas if (proc == NULL)
1590 62ee7d94 2023-01-10 thomas return got_error_from_errno("calloc");
1592 2c8fb90b 2023-06-25 thomas TAILQ_INSERT_HEAD(&procs, proc, entry);
1593 2c8fb90b 2023-06-25 thomas evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1595 7fed8fa4 2023-06-22 thomas if (client_is_reading(client))
1596 7fed8fa4 2023-06-22 thomas proc->type = PROC_SESSION_READ;
1598 7fed8fa4 2023-06-22 thomas proc->type = PROC_SESSION_WRITE;
1599 62ee7d94 2023-01-10 thomas if (strlcpy(proc->repo_name, repo->name,
1600 62ee7d94 2023-01-10 thomas sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1601 62ee7d94 2023-01-10 thomas fatalx("repository name too long: %s", repo->name);
1602 62ee7d94 2023-01-10 thomas log_debug("starting client uid %d session for repository %s",
1603 62ee7d94 2023-01-10 thomas client->euid, repo->name);
1604 62ee7d94 2023-01-10 thomas if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1605 62ee7d94 2023-01-10 thomas sizeof(proc->repo_path))
1606 62ee7d94 2023-01-10 thomas fatalx("repository path too long: %s", repo->path);
1607 62ee7d94 2023-01-10 thomas if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1608 62ee7d94 2023-01-10 thomas PF_UNSPEC, proc->pipe) == -1)
1609 62ee7d94 2023-01-10 thomas fatal("socketpair");
1610 62ee7d94 2023-01-10 thomas proc->pid = start_child(proc->type, proc->repo_path, argv0,
1611 62ee7d94 2023-01-10 thomas confpath, proc->pipe[1], daemonize, verbosity);
1612 62ee7d94 2023-01-10 thomas imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1613 62ee7d94 2023-01-10 thomas log_debug("proc %s %s is on fd %d",
1614 62ee7d94 2023-01-10 thomas gotd_proc_names[proc->type], proc->repo_path,
1615 62ee7d94 2023-01-10 thomas proc->pipe[0]);
1616 62ee7d94 2023-01-10 thomas proc->iev.handler = gotd_dispatch_client_session;
1617 62ee7d94 2023-01-10 thomas proc->iev.events = EV_READ;
1618 62ee7d94 2023-01-10 thomas proc->iev.handler_arg = NULL;
1619 62ee7d94 2023-01-10 thomas event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1620 62ee7d94 2023-01-10 thomas gotd_dispatch_client_session, &proc->iev);
1621 62ee7d94 2023-01-10 thomas gotd_imsg_event_add(&proc->iev);
1623 62ee7d94 2023-01-10 thomas client->session = proc;
1624 62ee7d94 2023-01-10 thomas return NULL;
1627 62ee7d94 2023-01-10 thomas static const struct got_error *
1628 85b37c72 2022-12-30 thomas start_repo_child(struct gotd_client *client, enum gotd_procid proc_type,
1629 85b37c72 2022-12-30 thomas struct gotd_repo *repo, char *argv0, const char *confpath,
1630 832b8374 2022-10-31 thomas int daemonize, int verbosity)
1632 3efd8e31 2022-10-23 thomas struct gotd_child_proc *proc;
1634 85b37c72 2022-12-30 thomas if (proc_type != PROC_REPO_READ && proc_type != PROC_REPO_WRITE)
1635 85b37c72 2022-12-30 thomas return got_error_msg(GOT_ERR_NOT_IMPL, "bad process type");
1637 85b37c72 2022-12-30 thomas proc = calloc(1, sizeof(*proc));
1638 85b37c72 2022-12-30 thomas if (proc == NULL)
1639 85b37c72 2022-12-30 thomas return got_error_from_errno("calloc");
1641 2c8fb90b 2023-06-25 thomas TAILQ_INSERT_HEAD(&procs, proc, entry);
1642 2c8fb90b 2023-06-25 thomas evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1644 85b37c72 2022-12-30 thomas proc->type = proc_type;
1645 85b37c72 2022-12-30 thomas if (strlcpy(proc->repo_name, repo->name,
1646 85b37c72 2022-12-30 thomas sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1647 85b37c72 2022-12-30 thomas fatalx("repository name too long: %s", repo->name);
1648 85b37c72 2022-12-30 thomas log_debug("starting %s for repository %s",
1649 85b37c72 2022-12-30 thomas proc->type == PROC_REPO_READ ? "reader" : "writer", repo->name);
1650 fe6a8988 2023-01-08 thomas if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1651 fe6a8988 2023-01-08 thomas sizeof(proc->repo_path))
1652 fe6a8988 2023-01-08 thomas fatalx("repository path too long: %s", repo->path);
1653 85b37c72 2022-12-30 thomas if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1654 85b37c72 2022-12-30 thomas PF_UNSPEC, proc->pipe) == -1)
1655 85b37c72 2022-12-30 thomas fatal("socketpair");
1656 85b37c72 2022-12-30 thomas proc->pid = start_child(proc->type, proc->repo_path, argv0,
1657 85b37c72 2022-12-30 thomas confpath, proc->pipe[1], daemonize, verbosity);
1658 85b37c72 2022-12-30 thomas imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1659 85b37c72 2022-12-30 thomas log_debug("proc %s %s is on fd %d",
1660 85b37c72 2022-12-30 thomas gotd_proc_names[proc->type], proc->repo_path,
1661 85b37c72 2022-12-30 thomas proc->pipe[0]);
1662 85b37c72 2022-12-30 thomas proc->iev.handler = gotd_dispatch_repo_child;
1663 85b37c72 2022-12-30 thomas proc->iev.events = EV_READ;
1664 85b37c72 2022-12-30 thomas proc->iev.handler_arg = NULL;
1665 85b37c72 2022-12-30 thomas event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1666 85b37c72 2022-12-30 thomas gotd_dispatch_repo_child, &proc->iev);
1667 85b37c72 2022-12-30 thomas gotd_imsg_event_add(&proc->iev);
1669 27b11d77 2023-01-14 thomas client->repo = proc;
1670 c669c489 2022-12-30 thomas return NULL;
1673 c669c489 2022-12-30 thomas static const struct got_error *
1674 c669c489 2022-12-30 thomas start_auth_child(struct gotd_client *client, int required_auth,
1675 c669c489 2022-12-30 thomas struct gotd_repo *repo, char *argv0, const char *confpath,
1676 c669c489 2022-12-30 thomas int daemonize, int verbosity)
1678 0bcde4c8 2022-12-30 thomas const struct got_error *err = NULL;
1679 c669c489 2022-12-30 thomas struct gotd_child_proc *proc;
1680 c669c489 2022-12-30 thomas struct gotd_imsg_auth iauth;
1683 c669c489 2022-12-30 thomas memset(&iauth, 0, sizeof(iauth));
1685 0bcde4c8 2022-12-30 thomas fd = dup(client->fd);
1686 0bcde4c8 2022-12-30 thomas if (fd == -1)
1687 0bcde4c8 2022-12-30 thomas return got_error_from_errno("dup");
1689 c669c489 2022-12-30 thomas proc = calloc(1, sizeof(*proc));
1690 0bcde4c8 2022-12-30 thomas if (proc == NULL) {
1691 0bcde4c8 2022-12-30 thomas err = got_error_from_errno("calloc");
1692 0bcde4c8 2022-12-30 thomas close(fd);
1693 0bcde4c8 2022-12-30 thomas return err;
1696 2c8fb90b 2023-06-25 thomas TAILQ_INSERT_HEAD(&procs, proc, entry);
1697 2c8fb90b 2023-06-25 thomas evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1699 c669c489 2022-12-30 thomas proc->type = PROC_AUTH;
1700 c669c489 2022-12-30 thomas if (strlcpy(proc->repo_name, repo->name,
1701 c669c489 2022-12-30 thomas sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1702 c669c489 2022-12-30 thomas fatalx("repository name too long: %s", repo->name);
1703 c669c489 2022-12-30 thomas log_debug("starting auth for uid %d repository %s",
1704 c669c489 2022-12-30 thomas client->euid, repo->name);
1705 fe6a8988 2023-01-08 thomas if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1706 fe6a8988 2023-01-08 thomas sizeof(proc->repo_path))
1707 fe6a8988 2023-01-08 thomas fatalx("repository path too long: %s", repo->path);
1708 c669c489 2022-12-30 thomas if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1709 c669c489 2022-12-30 thomas PF_UNSPEC, proc->pipe) == -1)
1710 c669c489 2022-12-30 thomas fatal("socketpair");
1711 c669c489 2022-12-30 thomas proc->pid = start_child(proc->type, proc->repo_path, argv0,
1712 c669c489 2022-12-30 thomas confpath, proc->pipe[1], daemonize, verbosity);
1713 c669c489 2022-12-30 thomas imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1714 c669c489 2022-12-30 thomas log_debug("proc %s %s is on fd %d",
1715 c669c489 2022-12-30 thomas gotd_proc_names[proc->type], proc->repo_path,
1716 c669c489 2022-12-30 thomas proc->pipe[0]);
1717 c669c489 2022-12-30 thomas proc->iev.handler = gotd_dispatch_auth_child;
1718 c669c489 2022-12-30 thomas proc->iev.events = EV_READ;
1719 c669c489 2022-12-30 thomas proc->iev.handler_arg = NULL;
1720 c669c489 2022-12-30 thomas event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1721 c669c489 2022-12-30 thomas gotd_dispatch_auth_child, &proc->iev);
1722 c669c489 2022-12-30 thomas gotd_imsg_event_add(&proc->iev);
1724 c669c489 2022-12-30 thomas iauth.euid = client->euid;
1725 c669c489 2022-12-30 thomas iauth.egid = client->egid;
1726 c669c489 2022-12-30 thomas iauth.required_auth = required_auth;
1727 c669c489 2022-12-30 thomas iauth.client_id = client->id;
1728 c669c489 2022-12-30 thomas if (gotd_imsg_compose_event(&proc->iev, GOTD_IMSG_AUTHENTICATE,
1729 0bcde4c8 2022-12-30 thomas PROC_GOTD, fd, &iauth, sizeof(iauth)) == -1) {
1730 c669c489 2022-12-30 thomas log_warn("imsg compose AUTHENTICATE");
1731 0bcde4c8 2022-12-30 thomas close(fd);
1732 0bcde4c8 2022-12-30 thomas /* Let the auth_timeout handler tidy up. */
1735 c669c489 2022-12-30 thomas client->auth = proc;
1736 c669c489 2022-12-30 thomas client->required_auth = required_auth;
1737 85b37c72 2022-12-30 thomas return NULL;
1740 414e37cb 2022-12-30 thomas static void
1741 7fed8fa4 2023-06-22 thomas apply_unveil_repo_readonly(const char *repo_path, int need_tmpdir)
1743 7fed8fa4 2023-06-22 thomas if (need_tmpdir) {
1744 7fed8fa4 2023-06-22 thomas if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
1745 7fed8fa4 2023-06-22 thomas fatal("unveil %s", GOT_TMPDIR_STR);
1748 414e37cb 2022-12-30 thomas if (unveil(repo_path, "r") == -1)
1749 414e37cb 2022-12-30 thomas fatal("unveil %s", repo_path);
1751 b942ab08 2022-12-30 thomas if (unveil(NULL, NULL) == -1)
1752 b942ab08 2022-12-30 thomas fatal("unveil");
1755 b942ab08 2022-12-30 thomas static void
1756 62ee7d94 2023-01-10 thomas apply_unveil_repo_readwrite(const char *repo_path)
1758 62ee7d94 2023-01-10 thomas if (unveil(repo_path, "rwc") == -1)
1759 62ee7d94 2023-01-10 thomas fatal("unveil %s", repo_path);
1761 62ee7d94 2023-01-10 thomas if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
1762 62ee7d94 2023-01-10 thomas fatal("unveil %s", GOT_TMPDIR_STR);
1764 62ee7d94 2023-01-10 thomas if (unveil(NULL, NULL) == -1)
1765 62ee7d94 2023-01-10 thomas fatal("unveil");
1768 62ee7d94 2023-01-10 thomas static void
1769 b942ab08 2022-12-30 thomas apply_unveil_none(void)
1771 b942ab08 2022-12-30 thomas if (unveil("/", "") == -1)
1772 b942ab08 2022-12-30 thomas fatal("unveil");
1774 414e37cb 2022-12-30 thomas if (unveil(NULL, NULL) == -1)
1775 414e37cb 2022-12-30 thomas fatal("unveil");
1778 3efd8e31 2022-10-23 thomas static void
1779 62ee7d94 2023-01-10 thomas apply_unveil_selfexec(void)
1781 85b37c72 2022-12-30 thomas if (unveil(gotd.argv0, "x") == -1)
1782 85b37c72 2022-12-30 thomas fatal("unveil %s", gotd.argv0);
1784 3efd8e31 2022-10-23 thomas if (unveil(NULL, NULL) == -1)
1785 3efd8e31 2022-10-23 thomas fatal("unveil");
1789 3efd8e31 2022-10-23 thomas main(int argc, char **argv)
1791 3efd8e31 2022-10-23 thomas const struct got_error *error = NULL;
1792 3efd8e31 2022-10-23 thomas int ch, fd = -1, daemonize = 1, verbosity = 0, noaction = 0;
1793 3efd8e31 2022-10-23 thomas const char *confpath = GOTD_CONF_PATH;
1794 3efd8e31 2022-10-23 thomas char *argv0 = argv[0];
1795 3efd8e31 2022-10-23 thomas char title[2048];
1796 3efd8e31 2022-10-23 thomas struct passwd *pw = NULL;
1797 3efd8e31 2022-10-23 thomas char *repo_path = NULL;
1798 3efd8e31 2022-10-23 thomas enum gotd_procid proc_id = PROC_GOTD;
1799 2c8fb90b 2023-06-25 thomas struct event evsigint, evsigterm, evsighup, evsigusr1, evsigchld;
1800 3efd8e31 2022-10-23 thomas int *pack_fds = NULL, *temp_fds = NULL;
1801 6d7eb4f7 2023-04-04 thomas struct gotd_repo *repo = NULL;
1803 2c8fb90b 2023-06-25 thomas TAILQ_INIT(&procs);
1805 3efd8e31 2022-10-23 thomas log_init(1, LOG_DAEMON); /* Log to stderr until daemonized. */
1807 7fed8fa4 2023-06-22 thomas while ((ch = getopt(argc, argv, "Adf:LnP:RsSvW")) != -1) {
1808 3efd8e31 2022-10-23 thomas switch (ch) {
1809 c669c489 2022-12-30 thomas case 'A':
1810 c669c489 2022-12-30 thomas proc_id = PROC_AUTH;
1812 3efd8e31 2022-10-23 thomas case 'd':
1813 3efd8e31 2022-10-23 thomas daemonize = 0;
1815 3efd8e31 2022-10-23 thomas case 'f':
1816 3efd8e31 2022-10-23 thomas confpath = optarg;
1818 2b3d32a1 2022-12-30 thomas case 'L':
1819 2b3d32a1 2022-12-30 thomas proc_id = PROC_LISTEN;
1821 3efd8e31 2022-10-23 thomas case 'n':
1822 3efd8e31 2022-10-23 thomas noaction = 1;
1824 f7065961 2022-10-27 thomas case 'P':
1825 f7065961 2022-10-27 thomas repo_path = realpath(optarg, NULL);
1826 f7065961 2022-10-27 thomas if (repo_path == NULL)
1827 f7065961 2022-10-27 thomas fatal("realpath '%s'", optarg);
1829 3efd8e31 2022-10-23 thomas case 'R':
1830 3efd8e31 2022-10-23 thomas proc_id = PROC_REPO_READ;
1832 7fed8fa4 2023-06-22 thomas case 's':
1833 7fed8fa4 2023-06-22 thomas proc_id = PROC_SESSION_READ;
1835 62ee7d94 2023-01-10 thomas case 'S':
1836 7fed8fa4 2023-06-22 thomas proc_id = PROC_SESSION_WRITE;
1838 f7065961 2022-10-27 thomas case 'v':
1839 f7065961 2022-10-27 thomas if (verbosity < 3)
1840 f7065961 2022-10-27 thomas verbosity++;
1842 3efd8e31 2022-10-23 thomas case 'W':
1843 3efd8e31 2022-10-23 thomas proc_id = PROC_REPO_WRITE;
1845 3efd8e31 2022-10-23 thomas default:
1846 3efd8e31 2022-10-23 thomas usage();
1850 3efd8e31 2022-10-23 thomas argc -= optind;
1851 3efd8e31 2022-10-23 thomas argv += optind;
1853 3efd8e31 2022-10-23 thomas if (argc != 0)
1854 3efd8e31 2022-10-23 thomas usage();
1856 85b37c72 2022-12-30 thomas if (geteuid() && (proc_id == PROC_GOTD || proc_id == PROC_LISTEN))
1857 3efd8e31 2022-10-23 thomas fatalx("need root privileges");
1859 f3807fe5 2023-07-10 thomas if (parse_config(confpath, proc_id, &gotd) != 0)
1860 3efd8e31 2022-10-23 thomas return 1;
1862 3efd8e31 2022-10-23 thomas pw = getpwnam(gotd.user_name);
1863 3efd8e31 2022-10-23 thomas if (pw == NULL)
1864 3e7c54e1 2022-12-30 thomas fatalx("user %s not found", gotd.user_name);
1866 b4b04e88 2023-01-19 thomas if (pw->pw_uid == 0)
1867 b4b04e88 2023-01-19 thomas fatalx("cannot run %s as the superuser", getprogname());
1869 b4b04e88 2023-01-19 thomas if (noaction) {
1870 b4b04e88 2023-01-19 thomas fprintf(stderr, "configuration OK\n");
1871 3efd8e31 2022-10-23 thomas return 0;
1874 b4b04e88 2023-01-19 thomas gotd.argv0 = argv0;
1875 b4b04e88 2023-01-19 thomas gotd.daemonize = daemonize;
1876 b4b04e88 2023-01-19 thomas gotd.verbosity = verbosity;
1877 b4b04e88 2023-01-19 thomas gotd.confpath = confpath;
1879 b4b04e88 2023-01-19 thomas /* Require an absolute path in argv[0] for reliable re-exec. */
1880 b4b04e88 2023-01-19 thomas if (!got_path_is_absolute(argv0))
1881 b4b04e88 2023-01-19 thomas fatalx("bad path \"%s\": must be an absolute path", argv0);
1883 b4b04e88 2023-01-19 thomas log_init(daemonize ? 0 : 1, LOG_DAEMON);
1884 b4b04e88 2023-01-19 thomas log_setverbose(verbosity);
1886 1eec6e4e 2022-12-06 thomas if (proc_id == PROC_GOTD) {
1887 2b3d32a1 2022-12-30 thomas snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
1888 2b3d32a1 2022-12-30 thomas arc4random_buf(&clients_hash_key, sizeof(clients_hash_key));
1889 2b3d32a1 2022-12-30 thomas if (daemonize && daemon(1, 0) == -1)
1890 2b3d32a1 2022-12-30 thomas fatal("daemon");
1891 1f1613cf 2023-01-23 thomas gotd.pid = getpid();
1892 1f1613cf 2023-01-23 thomas start_listener(argv0, confpath, daemonize, verbosity);
1893 2b3d32a1 2022-12-30 thomas } else if (proc_id == PROC_LISTEN) {
1894 2b3d32a1 2022-12-30 thomas snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
1895 1eec6e4e 2022-12-06 thomas if (verbosity) {
1896 1eec6e4e 2022-12-06 thomas log_info("socket: %s", gotd.unix_socket_path);
1897 1eec6e4e 2022-12-06 thomas log_info("user: %s", pw->pw_name);
1900 3efd8e31 2022-10-23 thomas fd = unix_socket_listen(gotd.unix_socket_path, pw->pw_uid,
1901 f2fc8ce0 2023-01-06 thomas pw->pw_gid);
1902 3efd8e31 2022-10-23 thomas if (fd == -1) {
1903 3efd8e31 2022-10-23 thomas fatal("cannot listen on unix socket %s",
1904 3efd8e31 2022-10-23 thomas gotd.unix_socket_path);
1906 c669c489 2022-12-30 thomas } else if (proc_id == PROC_AUTH) {
1907 c669c489 2022-12-30 thomas snprintf(title, sizeof(title), "%s %s",
1908 c669c489 2022-12-30 thomas gotd_proc_names[proc_id], repo_path);
1909 62ee7d94 2023-01-10 thomas } else if (proc_id == PROC_REPO_READ || proc_id == PROC_REPO_WRITE ||
1910 7fed8fa4 2023-06-22 thomas proc_id == PROC_SESSION_READ || proc_id == PROC_SESSION_WRITE) {
1911 3efd8e31 2022-10-23 thomas error = got_repo_pack_fds_open(&pack_fds);
1912 3efd8e31 2022-10-23 thomas if (error != NULL)
1913 3efd8e31 2022-10-23 thomas fatalx("cannot open pack tempfiles: %s", error->msg);
1914 3efd8e31 2022-10-23 thomas error = got_repo_temp_fds_open(&temp_fds);
1915 3efd8e31 2022-10-23 thomas if (error != NULL)
1916 3efd8e31 2022-10-23 thomas fatalx("cannot open pack tempfiles: %s", error->msg);
1917 3efd8e31 2022-10-23 thomas if (repo_path == NULL)
1918 3efd8e31 2022-10-23 thomas fatalx("repository path not specified");
1919 3efd8e31 2022-10-23 thomas snprintf(title, sizeof(title), "%s %s",
1920 3efd8e31 2022-10-23 thomas gotd_proc_names[proc_id], repo_path);
1922 3efd8e31 2022-10-23 thomas fatal("invalid process id %d", proc_id);
1924 3efd8e31 2022-10-23 thomas setproctitle("%s", title);
1925 3efd8e31 2022-10-23 thomas log_procinit(title);
1927 3efd8e31 2022-10-23 thomas /* Drop root privileges. */
1928 3efd8e31 2022-10-23 thomas if (setgid(pw->pw_gid) == -1)
1929 3efd8e31 2022-10-23 thomas fatal("setgid %d failed", pw->pw_gid);
1930 3efd8e31 2022-10-23 thomas if (setuid(pw->pw_uid) == -1)
1931 3efd8e31 2022-10-23 thomas fatal("setuid %d failed", pw->pw_uid);
1933 3efd8e31 2022-10-23 thomas event_init();
1935 3efd8e31 2022-10-23 thomas switch (proc_id) {
1936 3efd8e31 2022-10-23 thomas case PROC_GOTD:
1937 3efd8e31 2022-10-23 thomas #ifndef PROFILE
1938 62ee7d94 2023-01-10 thomas /* "exec" promise will be limited to argv[0] via unveil(2). */
1939 62ee7d94 2023-01-10 thomas if (pledge("stdio proc exec sendfd recvfd unveil", NULL) == -1)
1940 3efd8e31 2022-10-23 thomas err(1, "pledge");
1943 2b3d32a1 2022-12-30 thomas case PROC_LISTEN:
1944 2b3d32a1 2022-12-30 thomas #ifndef PROFILE
1945 d4940d40 2023-01-06 thomas if (pledge("stdio sendfd unix unveil", NULL) == -1)
1946 2b3d32a1 2022-12-30 thomas err(1, "pledge");
1949 d4940d40 2023-01-06 thomas * Ensure that AF_UNIX bind(2) cannot be used with any other
1950 d4940d40 2023-01-06 thomas * sockets by revoking all filesystem access via unveil(2).
1952 d4940d40 2023-01-06 thomas apply_unveil_none();
1954 0781db0e 2023-01-06 thomas listen_main(title, fd, gotd.connection_limits,
1955 0781db0e 2023-01-06 thomas gotd.nconnection_limits);
1956 2b3d32a1 2022-12-30 thomas /* NOTREACHED */
1958 c669c489 2022-12-30 thomas case PROC_AUTH:
1959 c669c489 2022-12-30 thomas #ifndef PROFILE
1960 b942ab08 2022-12-30 thomas if (pledge("stdio getpw recvfd unix unveil", NULL) == -1)
1961 c669c489 2022-12-30 thomas err(1, "pledge");
1964 b942ab08 2022-12-30 thomas * We need the "unix" pledge promise for getpeername(2) only.
1965 b942ab08 2022-12-30 thomas * Ensure that AF_UNIX bind(2) cannot be used by revoking all
1966 b942ab08 2022-12-30 thomas * filesystem access via unveil(2). Access to password database
1967 b942ab08 2022-12-30 thomas * files will still work since "getpw" bypasses unveil(2).
1969 b942ab08 2022-12-30 thomas apply_unveil_none();
1971 c669c489 2022-12-30 thomas auth_main(title, &gotd.repos, repo_path);
1972 c669c489 2022-12-30 thomas /* NOTREACHED */
1974 7fed8fa4 2023-06-22 thomas case PROC_SESSION_READ:
1975 7fed8fa4 2023-06-22 thomas case PROC_SESSION_WRITE:
1976 62ee7d94 2023-01-10 thomas #ifndef PROFILE
1978 62ee7d94 2023-01-10 thomas * The "recvfd" promise is only needed during setup and
1979 62ee7d94 2023-01-10 thomas * will be removed in a later pledge(2) call.
1981 62ee7d94 2023-01-10 thomas if (pledge("stdio rpath wpath cpath recvfd sendfd fattr flock "
1982 62ee7d94 2023-01-10 thomas "unveil", NULL) == -1)
1983 62ee7d94 2023-01-10 thomas err(1, "pledge");
1985 7fed8fa4 2023-06-22 thomas if (proc_id == PROC_SESSION_READ)
1986 7fed8fa4 2023-06-22 thomas apply_unveil_repo_readonly(repo_path, 1);
1988 7fed8fa4 2023-06-22 thomas apply_unveil_repo_readwrite(repo_path);
1989 62ee7d94 2023-01-10 thomas session_main(title, repo_path, pack_fds, temp_fds,
1990 7fed8fa4 2023-06-22 thomas &gotd.request_timeout, proc_id);
1991 62ee7d94 2023-01-10 thomas /* NOTREACHED */
1993 3efd8e31 2022-10-23 thomas case PROC_REPO_READ:
1994 3efd8e31 2022-10-23 thomas #ifndef PROFILE
1995 414e37cb 2022-12-30 thomas if (pledge("stdio rpath recvfd unveil", NULL) == -1)
1996 3efd8e31 2022-10-23 thomas err(1, "pledge");
1998 7fed8fa4 2023-06-22 thomas apply_unveil_repo_readonly(repo_path, 0);
1999 414e37cb 2022-12-30 thomas repo_read_main(title, repo_path, pack_fds, temp_fds);
2000 3efd8e31 2022-10-23 thomas /* NOTREACHED */
2001 3efd8e31 2022-10-23 thomas exit(0);
2002 3efd8e31 2022-10-23 thomas case PROC_REPO_WRITE:
2003 3efd8e31 2022-10-23 thomas #ifndef PROFILE
2004 414e37cb 2022-12-30 thomas if (pledge("stdio rpath recvfd unveil", NULL) == -1)
2005 3efd8e31 2022-10-23 thomas err(1, "pledge");
2007 7fed8fa4 2023-06-22 thomas apply_unveil_repo_readonly(repo_path, 0);
2008 6d7eb4f7 2023-04-04 thomas repo = gotd_find_repo_by_path(repo_path, &gotd);
2009 6d7eb4f7 2023-04-04 thomas if (repo == NULL)
2010 6d7eb4f7 2023-04-04 thomas fatalx("no repository for path %s", repo_path);
2011 6d7eb4f7 2023-04-04 thomas repo_write_main(title, repo_path, pack_fds, temp_fds,
2012 6d7eb4f7 2023-04-04 thomas &repo->protected_tag_namespaces,
2013 6d7eb4f7 2023-04-04 thomas &repo->protected_branch_namespaces,
2014 6d7eb4f7 2023-04-04 thomas &repo->protected_branches);
2015 3efd8e31 2022-10-23 thomas /* NOTREACHED */
2016 3efd8e31 2022-10-23 thomas exit(0);
2017 3efd8e31 2022-10-23 thomas default:
2018 3efd8e31 2022-10-23 thomas fatal("invalid process id %d", proc_id);
2021 3efd8e31 2022-10-23 thomas if (proc_id != PROC_GOTD)
2022 3efd8e31 2022-10-23 thomas fatal("invalid process id %d", proc_id);
2024 2c8fb90b 2023-06-25 thomas evtimer_set(&gotd.listen_proc->tmo, kill_proc_timeout,
2025 2c8fb90b 2023-06-25 thomas gotd.listen_proc);
2027 62ee7d94 2023-01-10 thomas apply_unveil_selfexec();
2029 3efd8e31 2022-10-23 thomas signal_set(&evsigint, SIGINT, gotd_sighdlr, NULL);
2030 3efd8e31 2022-10-23 thomas signal_set(&evsigterm, SIGTERM, gotd_sighdlr, NULL);
2031 3efd8e31 2022-10-23 thomas signal_set(&evsighup, SIGHUP, gotd_sighdlr, NULL);
2032 3efd8e31 2022-10-23 thomas signal_set(&evsigusr1, SIGUSR1, gotd_sighdlr, NULL);
2033 2c8fb90b 2023-06-25 thomas signal_set(&evsigchld, SIGCHLD, gotd_sighdlr, NULL);
2034 3efd8e31 2022-10-23 thomas signal(SIGPIPE, SIG_IGN);
2036 3efd8e31 2022-10-23 thomas signal_add(&evsigint, NULL);
2037 3efd8e31 2022-10-23 thomas signal_add(&evsigterm, NULL);
2038 3efd8e31 2022-10-23 thomas signal_add(&evsighup, NULL);
2039 3efd8e31 2022-10-23 thomas signal_add(&evsigusr1, NULL);
2040 2c8fb90b 2023-06-25 thomas signal_add(&evsigchld, NULL);
2042 78943464 2023-06-22 thomas gotd_imsg_event_add(&gotd.listen_proc->iev);
2044 3efd8e31 2022-10-23 thomas event_dispatch();
2046 3efd8e31 2022-10-23 thomas free(repo_path);
2047 62ee7d94 2023-01-10 thomas gotd_shutdown();
2049 3efd8e31 2022-10-23 thomas return 0;
