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/tree.h>
19 3efd8e31 2022-10-23 thomas #include <sys/time.h>
20 3efd8e31 2022-10-23 thomas #include <sys/types.h>
21 3efd8e31 2022-10-23 thomas #include <sys/stat.h>
22 3efd8e31 2022-10-23 thomas #include <sys/socket.h>
23 3efd8e31 2022-10-23 thomas #include <sys/un.h>
24 3efd8e31 2022-10-23 thomas #include <sys/wait.h>
26 3efd8e31 2022-10-23 thomas #include <fcntl.h>
27 3efd8e31 2022-10-23 thomas #include <err.h>
28 3efd8e31 2022-10-23 thomas #include <errno.h>
29 3efd8e31 2022-10-23 thomas #include <event.h>
30 3efd8e31 2022-10-23 thomas #include <limits.h>
31 3efd8e31 2022-10-23 thomas #include <pwd.h>
32 3efd8e31 2022-10-23 thomas #include <imsg.h>
33 3efd8e31 2022-10-23 thomas #include <sha1.h>
34 3efd8e31 2022-10-23 thomas #include <signal.h>
35 3efd8e31 2022-10-23 thomas #include <siphash.h>
36 3efd8e31 2022-10-23 thomas #include <stdarg.h>
37 3efd8e31 2022-10-23 thomas #include <stdio.h>
38 3efd8e31 2022-10-23 thomas #include <stdlib.h>
39 3efd8e31 2022-10-23 thomas #include <string.h>
40 3efd8e31 2022-10-23 thomas #include <syslog.h>
41 3efd8e31 2022-10-23 thomas #include <unistd.h>
43 3efd8e31 2022-10-23 thomas #include "got_error.h"
44 3efd8e31 2022-10-23 thomas #include "got_opentemp.h"
45 3efd8e31 2022-10-23 thomas #include "got_path.h"
46 3efd8e31 2022-10-23 thomas #include "got_repository.h"
47 3efd8e31 2022-10-23 thomas #include "got_object.h"
48 3efd8e31 2022-10-23 thomas #include "got_reference.h"
50 3efd8e31 2022-10-23 thomas #include "got_lib_delta.h"
51 3efd8e31 2022-10-23 thomas #include "got_lib_object.h"
52 3efd8e31 2022-10-23 thomas #include "got_lib_object_cache.h"
53 3efd8e31 2022-10-23 thomas #include "got_lib_sha1.h"
54 3efd8e31 2022-10-23 thomas #include "got_lib_gitproto.h"
55 3efd8e31 2022-10-23 thomas #include "got_lib_pack.h"
56 3efd8e31 2022-10-23 thomas #include "got_lib_repository.h"
58 3efd8e31 2022-10-23 thomas #include "gotd.h"
59 3efd8e31 2022-10-23 thomas #include "log.h"
60 2b3d32a1 2022-12-30 thomas #include "listen.h"
61 729a7e24 2022-11-17 thomas #include "auth.h"
62 62ee7d94 2023-01-10 thomas #include "session.h"
63 3efd8e31 2022-10-23 thomas #include "repo_read.h"
64 3efd8e31 2022-10-23 thomas #include "repo_write.h"
66 3efd8e31 2022-10-23 thomas #ifndef nitems
67 3efd8e31 2022-10-23 thomas #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
70 7b1db75e 2023-01-14 thomas enum gotd_client_state {
71 7b1db75e 2023-01-14 thomas GOTD_CLIENT_STATE_NEW,
72 7b1db75e 2023-01-14 thomas GOTD_CLIENT_STATE_ACCESS_GRANTED,
75 3efd8e31 2022-10-23 thomas struct gotd_client {
76 3efd8e31 2022-10-23 thomas STAILQ_ENTRY(gotd_client) entry;
77 3efd8e31 2022-10-23 thomas enum gotd_client_state state;
78 3efd8e31 2022-10-23 thomas uint32_t id;
80 3efd8e31 2022-10-23 thomas struct gotd_imsgev iev;
81 3efd8e31 2022-10-23 thomas struct event tmo;
82 3efd8e31 2022-10-23 thomas uid_t euid;
83 3efd8e31 2022-10-23 thomas gid_t egid;
84 27b11d77 2023-01-14 thomas struct gotd_child_proc *repo;
85 c669c489 2022-12-30 thomas struct gotd_child_proc *auth;
86 62ee7d94 2023-01-10 thomas struct gotd_child_proc *session;
87 c669c489 2022-12-30 thomas int required_auth;
89 3efd8e31 2022-10-23 thomas STAILQ_HEAD(gotd_clients, gotd_client);
91 3efd8e31 2022-10-23 thomas static struct gotd_clients gotd_clients[GOTD_CLIENT_TABLE_SIZE];
92 3efd8e31 2022-10-23 thomas static SIPHASH_KEY clients_hash_key;
93 3efd8e31 2022-10-23 thomas volatile int client_cnt;
94 95ef3f8a 2022-12-30 thomas static struct timeval auth_timeout = { 5, 0 };
95 3efd8e31 2022-10-23 thomas static struct gotd gotd;
97 3efd8e31 2022-10-23 thomas void gotd_sighdlr(int sig, short event, void *arg);
98 c902213d 2022-10-29 thomas static void gotd_shutdown(void);
99 62ee7d94 2023-01-10 thomas static const struct got_error *start_session_child(struct gotd_client *,
100 62ee7d94 2023-01-10 thomas struct gotd_repo *, char *, const char *, int, int);
101 85b37c72 2022-12-30 thomas static const struct got_error *start_repo_child(struct gotd_client *,
102 85b37c72 2022-12-30 thomas enum gotd_procid, struct gotd_repo *, char *, const char *, int, int);
103 c669c489 2022-12-30 thomas static const struct got_error *start_auth_child(struct gotd_client *, int,
104 c669c489 2022-12-30 thomas struct gotd_repo *, char *, const char *, int, int);
105 85b37c72 2022-12-30 thomas static void kill_proc(struct gotd_child_proc *, int);
107 3efd8e31 2022-10-23 thomas __dead static void
110 c855c9f0 2023-01-19 thomas fprintf(stderr, "usage: %s [-dnv] [-f config-file]\n", getprogname());
114 3efd8e31 2022-10-23 thomas static int
115 3efd8e31 2022-10-23 thomas unix_socket_listen(const char *unix_socket_path, uid_t uid, gid_t gid)
117 3efd8e31 2022-10-23 thomas struct sockaddr_un sun;
118 3efd8e31 2022-10-23 thomas int fd = -1;
119 3efd8e31 2022-10-23 thomas mode_t old_umask, mode;
121 3efd8e31 2022-10-23 thomas fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK| SOCK_CLOEXEC, 0);
122 3efd8e31 2022-10-23 thomas if (fd == -1) {
123 3efd8e31 2022-10-23 thomas log_warn("socket");
124 3efd8e31 2022-10-23 thomas return -1;
127 3efd8e31 2022-10-23 thomas sun.sun_family = AF_UNIX;
128 3efd8e31 2022-10-23 thomas if (strlcpy(sun.sun_path, unix_socket_path,
129 3efd8e31 2022-10-23 thomas sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
130 3efd8e31 2022-10-23 thomas log_warnx("%s: name too long", unix_socket_path);
131 3efd8e31 2022-10-23 thomas close(fd);
132 3efd8e31 2022-10-23 thomas return -1;
135 3efd8e31 2022-10-23 thomas if (unlink(unix_socket_path) == -1) {
136 3efd8e31 2022-10-23 thomas if (errno != ENOENT) {
137 3efd8e31 2022-10-23 thomas log_warn("unlink %s", unix_socket_path);
138 3efd8e31 2022-10-23 thomas close(fd);
139 3efd8e31 2022-10-23 thomas return -1;
143 3efd8e31 2022-10-23 thomas old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
144 f2fc8ce0 2023-01-06 thomas mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
146 3efd8e31 2022-10-23 thomas if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
147 3efd8e31 2022-10-23 thomas log_warn("bind: %s", unix_socket_path);
148 3efd8e31 2022-10-23 thomas close(fd);
149 3efd8e31 2022-10-23 thomas umask(old_umask);
150 3efd8e31 2022-10-23 thomas return -1;
153 3efd8e31 2022-10-23 thomas umask(old_umask);
155 3efd8e31 2022-10-23 thomas if (chmod(unix_socket_path, mode) == -1) {
156 3efd8e31 2022-10-23 thomas log_warn("chmod %o %s", mode, unix_socket_path);
157 3efd8e31 2022-10-23 thomas close(fd);
158 3efd8e31 2022-10-23 thomas unlink(unix_socket_path);
159 3efd8e31 2022-10-23 thomas return -1;
162 3efd8e31 2022-10-23 thomas if (chown(unix_socket_path, uid, gid) == -1) {
163 3efd8e31 2022-10-23 thomas log_warn("chown %s uid=%d gid=%d", unix_socket_path, uid, gid);
164 3efd8e31 2022-10-23 thomas close(fd);
165 3efd8e31 2022-10-23 thomas unlink(unix_socket_path);
166 3efd8e31 2022-10-23 thomas return -1;
169 3efd8e31 2022-10-23 thomas if (listen(fd, GOTD_UNIX_SOCKET_BACKLOG) == -1) {
170 3efd8e31 2022-10-23 thomas log_warn("listen");
171 3efd8e31 2022-10-23 thomas close(fd);
172 3efd8e31 2022-10-23 thomas unlink(unix_socket_path);
173 3efd8e31 2022-10-23 thomas return -1;
176 3efd8e31 2022-10-23 thomas return fd;
179 3efd8e31 2022-10-23 thomas static uint64_t
180 3efd8e31 2022-10-23 thomas client_hash(uint32_t client_id)
182 3efd8e31 2022-10-23 thomas return SipHash24(&clients_hash_key, &client_id, sizeof(client_id));
185 3efd8e31 2022-10-23 thomas static void
186 3efd8e31 2022-10-23 thomas add_client(struct gotd_client *client)
188 3efd8e31 2022-10-23 thomas uint64_t slot = client_hash(client->id) % nitems(gotd_clients);
189 3efd8e31 2022-10-23 thomas STAILQ_INSERT_HEAD(&gotd_clients[slot], client, entry);
190 3efd8e31 2022-10-23 thomas client_cnt++;
193 3efd8e31 2022-10-23 thomas static struct gotd_client *
194 3efd8e31 2022-10-23 thomas find_client(uint32_t client_id)
196 3efd8e31 2022-10-23 thomas uint64_t slot;
197 3efd8e31 2022-10-23 thomas struct gotd_client *c;
199 3efd8e31 2022-10-23 thomas slot = client_hash(client_id) % nitems(gotd_clients);
200 3efd8e31 2022-10-23 thomas STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
201 3efd8e31 2022-10-23 thomas if (c->id == client_id)
202 3efd8e31 2022-10-23 thomas return c;
205 3efd8e31 2022-10-23 thomas return NULL;
208 85b37c72 2022-12-30 thomas static struct gotd_client *
209 85b37c72 2022-12-30 thomas find_client_by_proc_fd(int fd)
211 85b37c72 2022-12-30 thomas uint64_t slot;
213 85b37c72 2022-12-30 thomas for (slot = 0; slot < nitems(gotd_clients); slot++) {
214 85b37c72 2022-12-30 thomas struct gotd_client *c;
216 85b37c72 2022-12-30 thomas STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
217 27b11d77 2023-01-14 thomas if (c->repo && c->repo->iev.ibuf.fd == fd)
218 85b37c72 2022-12-30 thomas return c;
219 c669c489 2022-12-30 thomas if (c->auth && c->auth->iev.ibuf.fd == fd)
220 62ee7d94 2023-01-10 thomas return c;
221 62ee7d94 2023-01-10 thomas if (c->session && c->session->iev.ibuf.fd == fd)
222 c669c489 2022-12-30 thomas return c;
226 3efd8e31 2022-10-23 thomas return NULL;
229 3efd8e31 2022-10-23 thomas static int
230 3efd8e31 2022-10-23 thomas client_is_reading(struct gotd_client *client)
232 27b11d77 2023-01-14 thomas return (client->required_auth &
233 27b11d77 2023-01-14 thomas (GOTD_AUTH_READ | GOTD_AUTH_WRITE)) == GOTD_AUTH_READ;
236 3efd8e31 2022-10-23 thomas static int
237 3efd8e31 2022-10-23 thomas client_is_writing(struct gotd_client *client)
239 27b11d77 2023-01-14 thomas return (client->required_auth &
240 27b11d77 2023-01-14 thomas (GOTD_AUTH_READ | GOTD_AUTH_WRITE)) ==
241 27b11d77 2023-01-14 thomas (GOTD_AUTH_READ | GOTD_AUTH_WRITE);
244 3efd8e31 2022-10-23 thomas static const struct got_error *
245 3efd8e31 2022-10-23 thomas ensure_client_is_not_writing(struct gotd_client *client)
247 3efd8e31 2022-10-23 thomas if (client_is_writing(client)) {
248 3efd8e31 2022-10-23 thomas return got_error_fmt(GOT_ERR_BAD_PACKET,
249 3efd8e31 2022-10-23 thomas "uid %d made a read-request but is writing to "
250 3efd8e31 2022-10-23 thomas "a repository", client->euid);
253 3efd8e31 2022-10-23 thomas return NULL;
256 3efd8e31 2022-10-23 thomas static const struct got_error *
257 3efd8e31 2022-10-23 thomas ensure_client_is_not_reading(struct gotd_client *client)
259 3efd8e31 2022-10-23 thomas if (client_is_reading(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 write-request but is reading from "
262 3efd8e31 2022-10-23 thomas "a repository", client->euid);
265 3efd8e31 2022-10-23 thomas return NULL;
268 85b37c72 2022-12-30 thomas static void
269 c669c489 2022-12-30 thomas wait_for_child(pid_t child_pid)
271 85b37c72 2022-12-30 thomas pid_t pid;
272 85b37c72 2022-12-30 thomas int status;
274 c669c489 2022-12-30 thomas log_debug("waiting for child PID %ld to terminate",
275 c669c489 2022-12-30 thomas (long)child_pid);
278 c669c489 2022-12-30 thomas pid = waitpid(child_pid, &status, WNOHANG);
279 85b37c72 2022-12-30 thomas if (pid == -1) {
280 85b37c72 2022-12-30 thomas if (errno != EINTR && errno != ECHILD)
281 85b37c72 2022-12-30 thomas fatal("wait");
282 85b37c72 2022-12-30 thomas } else if (WIFSIGNALED(status)) {
283 85b37c72 2022-12-30 thomas log_warnx("child PID %ld terminated; signal %d",
284 85b37c72 2022-12-30 thomas (long)pid, WTERMSIG(status));
286 85b37c72 2022-12-30 thomas } while (pid != -1 || (pid == -1 && errno == EINTR));
289 62ee7d94 2023-01-10 thomas static void
290 62ee7d94 2023-01-10 thomas proc_done(struct gotd_child_proc *proc)
292 62ee7d94 2023-01-10 thomas event_del(&proc->iev.ev);
293 62ee7d94 2023-01-10 thomas msgbuf_clear(&proc->iev.ibuf.w);
294 62ee7d94 2023-01-10 thomas close(proc->iev.ibuf.fd);
295 62ee7d94 2023-01-10 thomas kill_proc(proc, 0);
296 62ee7d94 2023-01-10 thomas wait_for_child(proc->pid);
297 62ee7d94 2023-01-10 thomas free(proc);
300 3efd8e31 2022-10-23 thomas static void
301 c669c489 2022-12-30 thomas kill_auth_proc(struct gotd_client *client)
303 c669c489 2022-12-30 thomas struct gotd_child_proc *proc;
305 c669c489 2022-12-30 thomas if (client->auth == NULL)
308 c669c489 2022-12-30 thomas proc = client->auth;
309 c669c489 2022-12-30 thomas client->auth = NULL;
311 62ee7d94 2023-01-10 thomas proc_done(proc);
314 c669c489 2022-12-30 thomas static void
315 62ee7d94 2023-01-10 thomas kill_session_proc(struct gotd_client *client)
317 62ee7d94 2023-01-10 thomas struct gotd_child_proc *proc;
319 62ee7d94 2023-01-10 thomas if (client->session == NULL)
322 62ee7d94 2023-01-10 thomas proc = client->session;
323 62ee7d94 2023-01-10 thomas client->session = NULL;
325 62ee7d94 2023-01-10 thomas proc_done(proc);
328 62ee7d94 2023-01-10 thomas static void
329 3efd8e31 2022-10-23 thomas disconnect(struct gotd_client *client)
331 3efd8e31 2022-10-23 thomas struct gotd_imsg_disconnect idisconnect;
332 27b11d77 2023-01-14 thomas struct gotd_child_proc *proc = client->repo;
333 85b37c72 2022-12-30 thomas struct gotd_child_proc *listen_proc = &gotd.listen_proc;
334 3efd8e31 2022-10-23 thomas uint64_t slot;
336 3efd8e31 2022-10-23 thomas log_debug("uid %d: disconnecting", client->euid);
338 c669c489 2022-12-30 thomas kill_auth_proc(client);
339 62ee7d94 2023-01-10 thomas kill_session_proc(client);
341 3efd8e31 2022-10-23 thomas idisconnect.client_id = client->id;
342 c902213d 2022-10-29 thomas if (proc) {
343 c902213d 2022-10-29 thomas if (gotd_imsg_compose_event(&proc->iev,
344 c902213d 2022-10-29 thomas GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
345 c902213d 2022-10-29 thomas &idisconnect, sizeof(idisconnect)) == -1)
346 c902213d 2022-10-29 thomas log_warn("imsg compose DISCONNECT");
348 85b37c72 2022-12-30 thomas msgbuf_clear(&proc->iev.ibuf.w);
349 85b37c72 2022-12-30 thomas close(proc->iev.ibuf.fd);
350 85b37c72 2022-12-30 thomas kill_proc(proc, 0);
351 c669c489 2022-12-30 thomas wait_for_child(proc->pid);
352 85b37c72 2022-12-30 thomas free(proc);
353 85b37c72 2022-12-30 thomas proc = NULL;
356 2b3d32a1 2022-12-30 thomas if (gotd_imsg_compose_event(&listen_proc->iev,
357 2b3d32a1 2022-12-30 thomas GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
358 2b3d32a1 2022-12-30 thomas &idisconnect, sizeof(idisconnect)) == -1)
359 2b3d32a1 2022-12-30 thomas log_warn("imsg compose DISCONNECT");
361 3efd8e31 2022-10-23 thomas slot = client_hash(client->id) % nitems(gotd_clients);
362 3efd8e31 2022-10-23 thomas STAILQ_REMOVE(&gotd_clients[slot], client, gotd_client, entry);
363 3efd8e31 2022-10-23 thomas imsg_clear(&client->iev.ibuf);
364 3efd8e31 2022-10-23 thomas event_del(&client->iev.ev);
365 3efd8e31 2022-10-23 thomas evtimer_del(&client->tmo);
366 62ee7d94 2023-01-10 thomas if (client->fd != -1)
367 62ee7d94 2023-01-10 thomas close(client->fd);
368 62ee7d94 2023-01-10 thomas else if (client->iev.ibuf.fd != -1)
369 62ee7d94 2023-01-10 thomas close(client->iev.ibuf.fd);
370 3efd8e31 2022-10-23 thomas free(client);
371 3efd8e31 2022-10-23 thomas client_cnt--;
374 3efd8e31 2022-10-23 thomas static void
375 3efd8e31 2022-10-23 thomas disconnect_on_error(struct gotd_client *client, const struct got_error *err)
377 3efd8e31 2022-10-23 thomas struct imsgbuf ibuf;
379 3efd8e31 2022-10-23 thomas log_warnx("uid %d: %s", client->euid, err->msg);
380 62ee7d94 2023-01-10 thomas if (err->code != GOT_ERR_EOF && client->fd != -1) {
381 3efd8e31 2022-10-23 thomas imsg_init(&ibuf, client->fd);
382 3efd8e31 2022-10-23 thomas gotd_imsg_send_error(&ibuf, 0, PROC_GOTD, err);
383 3efd8e31 2022-10-23 thomas imsg_clear(&ibuf);
385 3efd8e31 2022-10-23 thomas disconnect(client);
388 c902213d 2022-10-29 thomas static const struct got_error *
389 c902213d 2022-10-29 thomas send_repo_info(struct gotd_imsgev *iev, struct gotd_repo *repo)
391 c902213d 2022-10-29 thomas const struct got_error *err = NULL;
392 c902213d 2022-10-29 thomas struct gotd_imsg_info_repo irepo;
394 c902213d 2022-10-29 thomas memset(&irepo, 0, sizeof(irepo));
396 c902213d 2022-10-29 thomas if (strlcpy(irepo.repo_name, repo->name, sizeof(irepo.repo_name))
397 c902213d 2022-10-29 thomas >= sizeof(irepo.repo_name))
398 c902213d 2022-10-29 thomas return got_error_msg(GOT_ERR_NO_SPACE, "repo name too long");
399 c902213d 2022-10-29 thomas if (strlcpy(irepo.repo_path, repo->path, sizeof(irepo.repo_path))
400 c902213d 2022-10-29 thomas >= sizeof(irepo.repo_path))
401 c902213d 2022-10-29 thomas return got_error_msg(GOT_ERR_NO_SPACE, "repo path too long");
403 c902213d 2022-10-29 thomas if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_REPO, PROC_GOTD, -1,
404 c902213d 2022-10-29 thomas &irepo, sizeof(irepo)) == -1) {
405 c902213d 2022-10-29 thomas err = got_error_from_errno("imsg compose INFO_REPO");
407 c902213d 2022-10-29 thomas return err;
410 c902213d 2022-10-29 thomas return NULL;
413 c902213d 2022-10-29 thomas static const struct got_error *
414 c902213d 2022-10-29 thomas send_client_info(struct gotd_imsgev *iev, struct gotd_client *client)
416 c902213d 2022-10-29 thomas const struct got_error *err = NULL;
417 c902213d 2022-10-29 thomas struct gotd_imsg_info_client iclient;
418 c902213d 2022-10-29 thomas struct gotd_child_proc *proc;
420 c902213d 2022-10-29 thomas memset(&iclient, 0, sizeof(iclient));
421 c902213d 2022-10-29 thomas iclient.euid = client->euid;
422 c902213d 2022-10-29 thomas iclient.egid = client->egid;
424 27b11d77 2023-01-14 thomas proc = client->repo;
425 c902213d 2022-10-29 thomas if (proc) {
426 414e37cb 2022-12-30 thomas if (strlcpy(iclient.repo_name, proc->repo_path,
427 c902213d 2022-10-29 thomas sizeof(iclient.repo_name)) >= sizeof(iclient.repo_name)) {
428 c902213d 2022-10-29 thomas return got_error_msg(GOT_ERR_NO_SPACE,
429 c902213d 2022-10-29 thomas "repo name too long");
431 c902213d 2022-10-29 thomas if (client_is_writing(client))
432 c902213d 2022-10-29 thomas iclient.is_writing = 1;
434 62ee7d94 2023-01-10 thomas iclient.repo_child_pid = proc->pid;
437 62ee7d94 2023-01-10 thomas if (client->session)
438 62ee7d94 2023-01-10 thomas iclient.session_child_pid = client->session->pid;
440 c902213d 2022-10-29 thomas if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_CLIENT, PROC_GOTD, -1,
441 c902213d 2022-10-29 thomas &iclient, sizeof(iclient)) == -1) {
442 c902213d 2022-10-29 thomas err = got_error_from_errno("imsg compose INFO_CLIENT");
444 c902213d 2022-10-29 thomas return err;
447 c902213d 2022-10-29 thomas return NULL;
450 c902213d 2022-10-29 thomas static const struct got_error *
451 c902213d 2022-10-29 thomas send_info(struct gotd_client *client)
453 c902213d 2022-10-29 thomas const struct got_error *err = NULL;
454 c902213d 2022-10-29 thomas struct gotd_imsg_info info;
455 c902213d 2022-10-29 thomas uint64_t slot;
456 c902213d 2022-10-29 thomas struct gotd_repo *repo;
458 c8cf6821 2023-01-06 thomas if (client->euid != 0)
459 c8cf6821 2023-01-06 thomas return got_error_set_errno(EPERM, "info");
461 c902213d 2022-10-29 thomas info.pid = gotd.pid;
462 c902213d 2022-10-29 thomas info.verbosity = gotd.verbosity;
463 c902213d 2022-10-29 thomas info.nrepos = gotd.nrepos;
464 c902213d 2022-10-29 thomas info.nclients = client_cnt - 1;
466 c902213d 2022-10-29 thomas if (gotd_imsg_compose_event(&client->iev, GOTD_IMSG_INFO, PROC_GOTD, -1,
467 c902213d 2022-10-29 thomas &info, sizeof(info)) == -1) {
468 c902213d 2022-10-29 thomas err = got_error_from_errno("imsg compose INFO");
470 c902213d 2022-10-29 thomas return err;
473 c902213d 2022-10-29 thomas TAILQ_FOREACH(repo, &gotd.repos, entry) {
474 c902213d 2022-10-29 thomas err = send_repo_info(&client->iev, repo);
476 c902213d 2022-10-29 thomas return err;
479 c902213d 2022-10-29 thomas for (slot = 0; slot < nitems(gotd_clients); slot++) {
480 c902213d 2022-10-29 thomas struct gotd_client *c;
481 c902213d 2022-10-29 thomas STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
482 c902213d 2022-10-29 thomas if (c->id == client->id)
483 c902213d 2022-10-29 thomas continue;
484 c902213d 2022-10-29 thomas err = send_client_info(&client->iev, c);
486 c902213d 2022-10-29 thomas return err;
490 c902213d 2022-10-29 thomas return NULL;
493 c902213d 2022-10-29 thomas static const struct got_error *
494 c902213d 2022-10-29 thomas stop_gotd(struct gotd_client *client)
497 c902213d 2022-10-29 thomas if (client->euid != 0)
498 c902213d 2022-10-29 thomas return got_error_set_errno(EPERM, "stop");
500 c902213d 2022-10-29 thomas gotd_shutdown();
501 c902213d 2022-10-29 thomas /* NOTREACHED */
502 729a7e24 2022-11-17 thomas return NULL;
505 729a7e24 2022-11-17 thomas static struct gotd_repo *
506 729a7e24 2022-11-17 thomas find_repo_by_name(const char *repo_name)
508 729a7e24 2022-11-17 thomas struct gotd_repo *repo;
509 729a7e24 2022-11-17 thomas size_t namelen;
511 729a7e24 2022-11-17 thomas TAILQ_FOREACH(repo, &gotd.repos, entry) {
512 729a7e24 2022-11-17 thomas namelen = strlen(repo->name);
513 729a7e24 2022-11-17 thomas if (strncmp(repo->name, repo_name, namelen) != 0)
514 729a7e24 2022-11-17 thomas continue;
515 729a7e24 2022-11-17 thomas if (repo_name[namelen] == '\0' ||
516 729a7e24 2022-11-17 thomas strcmp(&repo_name[namelen], ".git") == 0)
517 729a7e24 2022-11-17 thomas return repo;
520 3efd8e31 2022-10-23 thomas return NULL;
523 3efd8e31 2022-10-23 thomas static const struct got_error *
524 62ee7d94 2023-01-10 thomas start_client_authentication(struct gotd_client *client, struct imsg *imsg)
526 3efd8e31 2022-10-23 thomas const struct got_error *err;
527 3efd8e31 2022-10-23 thomas struct gotd_imsg_list_refs ireq;
528 729a7e24 2022-11-17 thomas struct gotd_repo *repo = NULL;
529 3efd8e31 2022-10-23 thomas size_t datalen;
531 3efd8e31 2022-10-23 thomas log_debug("list-refs request from uid %d", client->euid);
533 7b1db75e 2023-01-14 thomas if (client->state != GOTD_CLIENT_STATE_NEW)
534 62ee7d94 2023-01-10 thomas return got_error_msg(GOT_ERR_BAD_REQUEST,
535 62ee7d94 2023-01-10 thomas "unexpected list-refs request received");
537 3efd8e31 2022-10-23 thomas datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
538 3efd8e31 2022-10-23 thomas if (datalen != sizeof(ireq))
539 3efd8e31 2022-10-23 thomas return got_error(GOT_ERR_PRIVSEP_LEN);
541 3efd8e31 2022-10-23 thomas memcpy(&ireq, imsg->data, datalen);
543 3efd8e31 2022-10-23 thomas if (ireq.client_is_reading) {
544 3efd8e31 2022-10-23 thomas err = ensure_client_is_not_writing(client);
546 3efd8e31 2022-10-23 thomas return err;
547 729a7e24 2022-11-17 thomas repo = find_repo_by_name(ireq.repo_name);
548 729a7e24 2022-11-17 thomas if (repo == NULL)
549 729a7e24 2022-11-17 thomas return got_error(GOT_ERR_NOT_GIT_REPO);
550 c669c489 2022-12-30 thomas err = start_auth_child(client, GOTD_AUTH_READ, repo,
551 85b37c72 2022-12-30 thomas gotd.argv0, gotd.confpath, gotd.daemonize,
552 85b37c72 2022-12-30 thomas gotd.verbosity);
554 85b37c72 2022-12-30 thomas return err;
556 3efd8e31 2022-10-23 thomas err = ensure_client_is_not_reading(client);
558 729a7e24 2022-11-17 thomas return err;
559 729a7e24 2022-11-17 thomas repo = find_repo_by_name(ireq.repo_name);
560 729a7e24 2022-11-17 thomas if (repo == NULL)
561 729a7e24 2022-11-17 thomas return got_error(GOT_ERR_NOT_GIT_REPO);
562 c669c489 2022-12-30 thomas err = start_auth_child(client,
563 c669c489 2022-12-30 thomas GOTD_AUTH_READ | GOTD_AUTH_WRITE,
564 c669c489 2022-12-30 thomas repo, gotd.argv0, gotd.confpath, gotd.daemonize,
565 85b37c72 2022-12-30 thomas gotd.verbosity);
567 85b37c72 2022-12-30 thomas return err;
570 62ee7d94 2023-01-10 thomas evtimer_add(&client->tmo, &auth_timeout);
572 62ee7d94 2023-01-10 thomas /* Flow continues upon authentication successs/failure or timeout. */
573 3efd8e31 2022-10-23 thomas return NULL;
576 3efd8e31 2022-10-23 thomas static void
577 3efd8e31 2022-10-23 thomas gotd_request(int fd, short events, void *arg)
579 3efd8e31 2022-10-23 thomas struct gotd_imsgev *iev = arg;
580 3efd8e31 2022-10-23 thomas struct imsgbuf *ibuf = &iev->ibuf;
581 3efd8e31 2022-10-23 thomas struct gotd_client *client = iev->handler_arg;
582 3efd8e31 2022-10-23 thomas const struct got_error *err = NULL;
583 3efd8e31 2022-10-23 thomas struct imsg imsg;
584 3efd8e31 2022-10-23 thomas ssize_t n;
586 3efd8e31 2022-10-23 thomas if (events & EV_WRITE) {
587 3efd8e31 2022-10-23 thomas while (ibuf->w.queued) {
588 3efd8e31 2022-10-23 thomas n = msgbuf_write(&ibuf->w);
589 3efd8e31 2022-10-23 thomas if (n == -1 && errno == EPIPE) {
591 3efd8e31 2022-10-23 thomas * The client has closed its socket.
592 3efd8e31 2022-10-23 thomas * This can happen when Git clients are
593 3efd8e31 2022-10-23 thomas * done sending pack file data.
595 3efd8e31 2022-10-23 thomas msgbuf_clear(&ibuf->w);
596 3efd8e31 2022-10-23 thomas continue;
597 3efd8e31 2022-10-23 thomas } else if (n == -1 && errno != EAGAIN) {
598 3efd8e31 2022-10-23 thomas err = got_error_from_errno("imsg_flush");
599 3efd8e31 2022-10-23 thomas disconnect_on_error(client, err);
602 3efd8e31 2022-10-23 thomas if (n == 0) {
603 3efd8e31 2022-10-23 thomas /* Connection closed. */
604 3efd8e31 2022-10-23 thomas err = got_error(GOT_ERR_EOF);
605 3efd8e31 2022-10-23 thomas disconnect_on_error(client, err);
610 c902213d 2022-10-29 thomas /* Disconnect gotctl(8) now that messages have been sent. */
611 c902213d 2022-10-29 thomas if (!client_is_reading(client) && !client_is_writing(client)) {
612 c902213d 2022-10-29 thomas disconnect(client);
617 3efd8e31 2022-10-23 thomas if ((events & EV_READ) == 0)
620 3efd8e31 2022-10-23 thomas memset(&imsg, 0, sizeof(imsg));
622 3efd8e31 2022-10-23 thomas while (err == NULL) {
623 3efd8e31 2022-10-23 thomas err = gotd_imsg_recv(&imsg, ibuf, 0);
624 3efd8e31 2022-10-23 thomas if (err) {
625 3efd8e31 2022-10-23 thomas if (err->code == GOT_ERR_PRIVSEP_READ)
626 3efd8e31 2022-10-23 thomas err = NULL;
630 3efd8e31 2022-10-23 thomas evtimer_del(&client->tmo);
632 3efd8e31 2022-10-23 thomas switch (imsg.hdr.type) {
633 c902213d 2022-10-29 thomas case GOTD_IMSG_INFO:
634 c902213d 2022-10-29 thomas err = send_info(client);
636 c902213d 2022-10-29 thomas case GOTD_IMSG_STOP:
637 c902213d 2022-10-29 thomas err = stop_gotd(client);
639 3efd8e31 2022-10-23 thomas case GOTD_IMSG_LIST_REFS:
640 62ee7d94 2023-01-10 thomas err = start_client_authentication(client, &imsg);
643 62ee7d94 2023-01-10 thomas log_debug("unexpected imsg %d", imsg.hdr.type);
644 3efd8e31 2022-10-23 thomas err = got_error(GOT_ERR_PRIVSEP_MSG);
648 3efd8e31 2022-10-23 thomas imsg_free(&imsg);
651 3efd8e31 2022-10-23 thomas if (err) {
652 f5f71a04 2023-01-23 thomas disconnect_on_error(client, err);
654 3efd8e31 2022-10-23 thomas gotd_imsg_event_add(&client->iev);
658 3efd8e31 2022-10-23 thomas static void
659 62ee7d94 2023-01-10 thomas gotd_auth_timeout(int fd, short events, void *arg)
661 3efd8e31 2022-10-23 thomas struct gotd_client *client = arg;
663 62ee7d94 2023-01-10 thomas log_debug("disconnecting uid %d due to authentication timeout",
664 62ee7d94 2023-01-10 thomas client->euid);
665 3efd8e31 2022-10-23 thomas disconnect(client);
668 2b3d32a1 2022-12-30 thomas static const struct got_error *
669 2b3d32a1 2022-12-30 thomas recv_connect(uint32_t *client_id, struct imsg *imsg)
671 2b3d32a1 2022-12-30 thomas const struct got_error *err = NULL;
672 2b3d32a1 2022-12-30 thomas struct gotd_imsg_connect iconnect;
673 2b3d32a1 2022-12-30 thomas size_t datalen;
674 3efd8e31 2022-10-23 thomas int s = -1;
675 3efd8e31 2022-10-23 thomas struct gotd_client *client = NULL;
677 2b3d32a1 2022-12-30 thomas *client_id = 0;
679 2b3d32a1 2022-12-30 thomas datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
680 2b3d32a1 2022-12-30 thomas if (datalen != sizeof(iconnect))
681 2b3d32a1 2022-12-30 thomas return got_error(GOT_ERR_PRIVSEP_LEN);
682 2b3d32a1 2022-12-30 thomas memcpy(&iconnect, imsg->data, sizeof(iconnect));
684 2b3d32a1 2022-12-30 thomas s = imsg->fd;
685 3efd8e31 2022-10-23 thomas if (s == -1) {
686 2b3d32a1 2022-12-30 thomas err = got_error(GOT_ERR_PRIVSEP_NO_FD);
687 2b3d32a1 2022-12-30 thomas goto done;
690 2b3d32a1 2022-12-30 thomas if (find_client(iconnect.client_id)) {
691 2b3d32a1 2022-12-30 thomas err = got_error_msg(GOT_ERR_CLIENT_ID, "duplicate client ID");
692 2b3d32a1 2022-12-30 thomas goto done;
695 3efd8e31 2022-10-23 thomas client = calloc(1, sizeof(*client));
696 3efd8e31 2022-10-23 thomas if (client == NULL) {
697 2b3d32a1 2022-12-30 thomas err = got_error_from_errno("calloc");
698 2b3d32a1 2022-12-30 thomas goto done;
701 2b3d32a1 2022-12-30 thomas *client_id = iconnect.client_id;
703 7b1db75e 2023-01-14 thomas client->state = GOTD_CLIENT_STATE_NEW;
704 2b3d32a1 2022-12-30 thomas client->id = iconnect.client_id;
705 3efd8e31 2022-10-23 thomas client->fd = s;
707 0bcde4c8 2022-12-30 thomas /* The auth process will verify UID/GID for us. */
708 0bcde4c8 2022-12-30 thomas client->euid = iconnect.euid;
709 0bcde4c8 2022-12-30 thomas client->egid = iconnect.egid;
711 3efd8e31 2022-10-23 thomas imsg_init(&client->iev.ibuf, client->fd);
712 3efd8e31 2022-10-23 thomas client->iev.handler = gotd_request;
713 3efd8e31 2022-10-23 thomas client->iev.events = EV_READ;
714 3efd8e31 2022-10-23 thomas client->iev.handler_arg = client;
716 3efd8e31 2022-10-23 thomas event_set(&client->iev.ev, client->fd, EV_READ, gotd_request,
717 3efd8e31 2022-10-23 thomas &client->iev);
718 3efd8e31 2022-10-23 thomas gotd_imsg_event_add(&client->iev);
720 62ee7d94 2023-01-10 thomas evtimer_set(&client->tmo, gotd_auth_timeout, client);
722 3efd8e31 2022-10-23 thomas add_client(client);
723 3efd8e31 2022-10-23 thomas log_debug("%s: new client uid %d connected on fd %d", __func__,
724 3efd8e31 2022-10-23 thomas client->euid, client->fd);
726 2b3d32a1 2022-12-30 thomas if (err) {
727 85b37c72 2022-12-30 thomas struct gotd_child_proc *listen_proc = &gotd.listen_proc;
728 2b3d32a1 2022-12-30 thomas struct gotd_imsg_disconnect idisconnect;
730 2b3d32a1 2022-12-30 thomas idisconnect.client_id = client->id;
731 2b3d32a1 2022-12-30 thomas if (gotd_imsg_compose_event(&listen_proc->iev,
732 2b3d32a1 2022-12-30 thomas GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
733 2b3d32a1 2022-12-30 thomas &idisconnect, sizeof(idisconnect)) == -1)
734 2b3d32a1 2022-12-30 thomas log_warn("imsg compose DISCONNECT");
736 2b3d32a1 2022-12-30 thomas if (s != -1)
737 2b3d32a1 2022-12-30 thomas close(s);
740 2b3d32a1 2022-12-30 thomas return err;
743 3efd8e31 2022-10-23 thomas static const char *gotd_proc_names[PROC_MAX] = {
744 3efd8e31 2022-10-23 thomas "parent",
745 2b3d32a1 2022-12-30 thomas "listen",
747 62ee7d94 2023-01-10 thomas "session",
748 3efd8e31 2022-10-23 thomas "repo_read",
749 3efd8e31 2022-10-23 thomas "repo_write"
752 3efd8e31 2022-10-23 thomas static void
753 3efd8e31 2022-10-23 thomas kill_proc(struct gotd_child_proc *proc, int fatal)
755 3efd8e31 2022-10-23 thomas if (fatal) {
756 3efd8e31 2022-10-23 thomas log_warnx("sending SIGKILL to PID %d", proc->pid);
757 3efd8e31 2022-10-23 thomas kill(proc->pid, SIGKILL);
759 3efd8e31 2022-10-23 thomas kill(proc->pid, SIGTERM);
762 3efd8e31 2022-10-23 thomas static void
763 3efd8e31 2022-10-23 thomas gotd_shutdown(void)
765 3efd8e31 2022-10-23 thomas struct gotd_child_proc *proc;
766 85b37c72 2022-12-30 thomas uint64_t slot;
768 62ee7d94 2023-01-10 thomas log_debug("shutting down");
769 85b37c72 2022-12-30 thomas for (slot = 0; slot < nitems(gotd_clients); slot++) {
770 85b37c72 2022-12-30 thomas struct gotd_client *c, *tmp;
772 85b37c72 2022-12-30 thomas STAILQ_FOREACH_SAFE(c, &gotd_clients[slot], entry, tmp)
773 85b37c72 2022-12-30 thomas disconnect(c);
776 85b37c72 2022-12-30 thomas proc = &gotd.listen_proc;
777 85b37c72 2022-12-30 thomas msgbuf_clear(&proc->iev.ibuf.w);
778 85b37c72 2022-12-30 thomas close(proc->iev.ibuf.fd);
779 85b37c72 2022-12-30 thomas kill_proc(proc, 0);
780 c669c489 2022-12-30 thomas wait_for_child(proc->pid);
782 3efd8e31 2022-10-23 thomas log_info("terminating");
787 3efd8e31 2022-10-23 thomas gotd_sighdlr(int sig, short event, void *arg)
790 3efd8e31 2022-10-23 thomas * Normal signal handler rules don't apply because libevent
791 3efd8e31 2022-10-23 thomas * decouples for us.
794 3efd8e31 2022-10-23 thomas switch (sig) {
795 3efd8e31 2022-10-23 thomas case SIGHUP:
796 3efd8e31 2022-10-23 thomas log_info("%s: ignoring SIGHUP", __func__);
798 3efd8e31 2022-10-23 thomas case SIGUSR1:
799 3efd8e31 2022-10-23 thomas log_info("%s: ignoring SIGUSR1", __func__);
801 3efd8e31 2022-10-23 thomas case SIGTERM:
802 3efd8e31 2022-10-23 thomas case SIGINT:
803 3efd8e31 2022-10-23 thomas gotd_shutdown();
806 3efd8e31 2022-10-23 thomas fatalx("unexpected signal");
810 3efd8e31 2022-10-23 thomas static const struct got_error *
811 3efd8e31 2022-10-23 thomas ensure_proc_is_reading(struct gotd_client *client,
812 3efd8e31 2022-10-23 thomas struct gotd_child_proc *proc)
814 3efd8e31 2022-10-23 thomas if (!client_is_reading(client)) {
815 3efd8e31 2022-10-23 thomas kill_proc(proc, 1);
816 3efd8e31 2022-10-23 thomas return got_error_fmt(GOT_ERR_BAD_PACKET,
817 3efd8e31 2022-10-23 thomas "PID %d handled a read-request for uid %d but this "
818 3efd8e31 2022-10-23 thomas "user is not reading from a repository", proc->pid,
819 3efd8e31 2022-10-23 thomas client->euid);
822 3efd8e31 2022-10-23 thomas return NULL;
825 3efd8e31 2022-10-23 thomas static const struct got_error *
826 3efd8e31 2022-10-23 thomas ensure_proc_is_writing(struct gotd_client *client,
827 3efd8e31 2022-10-23 thomas struct gotd_child_proc *proc)
829 3efd8e31 2022-10-23 thomas if (!client_is_writing(client)) {
830 3efd8e31 2022-10-23 thomas kill_proc(proc, 1);
831 3efd8e31 2022-10-23 thomas return got_error_fmt(GOT_ERR_BAD_PACKET,
832 3efd8e31 2022-10-23 thomas "PID %d handled a write-request for uid %d but this "
833 3efd8e31 2022-10-23 thomas "user is not writing to a repository", proc->pid,
834 3efd8e31 2022-10-23 thomas client->euid);
837 3efd8e31 2022-10-23 thomas return NULL;
840 3efd8e31 2022-10-23 thomas static int
841 3efd8e31 2022-10-23 thomas verify_imsg_src(struct gotd_client *client, struct gotd_child_proc *proc,
842 3efd8e31 2022-10-23 thomas struct imsg *imsg)
844 3efd8e31 2022-10-23 thomas const struct got_error *err;
845 3efd8e31 2022-10-23 thomas int ret = 0;
847 2b3d32a1 2022-12-30 thomas if (proc->type == PROC_REPO_READ || proc->type == PROC_REPO_WRITE) {
848 27b11d77 2023-01-14 thomas if (client->repo == NULL)
849 2b3d32a1 2022-12-30 thomas fatalx("no process found for uid %d", client->euid);
850 27b11d77 2023-01-14 thomas if (proc->pid != client->repo->pid) {
851 2b3d32a1 2022-12-30 thomas kill_proc(proc, 1);
852 2b3d32a1 2022-12-30 thomas log_warnx("received message from PID %d for uid %d, "
853 2b3d32a1 2022-12-30 thomas "while PID %d is the process serving this user",
854 27b11d77 2023-01-14 thomas proc->pid, client->euid, client->repo->pid);
855 2b3d32a1 2022-12-30 thomas return 0;
858 62ee7d94 2023-01-10 thomas if (proc->type == PROC_SESSION) {
859 62ee7d94 2023-01-10 thomas if (client->session == NULL) {
860 62ee7d94 2023-01-10 thomas log_warnx("no session found for uid %d", client->euid);
861 62ee7d94 2023-01-10 thomas return 0;
863 62ee7d94 2023-01-10 thomas if (proc->pid != client->session->pid) {
864 62ee7d94 2023-01-10 thomas kill_proc(proc, 1);
865 62ee7d94 2023-01-10 thomas log_warnx("received message from PID %d for uid %d, "
866 62ee7d94 2023-01-10 thomas "while PID %d is the process serving this user",
867 62ee7d94 2023-01-10 thomas proc->pid, client->euid, client->session->pid);
868 62ee7d94 2023-01-10 thomas return 0;
872 3efd8e31 2022-10-23 thomas switch (imsg->hdr.type) {
873 3efd8e31 2022-10-23 thomas case GOTD_IMSG_ERROR:
876 2b3d32a1 2022-12-30 thomas case GOTD_IMSG_CONNECT:
877 2b3d32a1 2022-12-30 thomas if (proc->type != PROC_LISTEN) {
878 2b3d32a1 2022-12-30 thomas err = got_error_fmt(GOT_ERR_BAD_PACKET,
879 2b3d32a1 2022-12-30 thomas "new connection for uid %d from PID %d "
880 2b3d32a1 2022-12-30 thomas "which is not the listen process",
881 c669c489 2022-12-30 thomas proc->pid, client->euid);
885 c669c489 2022-12-30 thomas case GOTD_IMSG_ACCESS_GRANTED:
886 c669c489 2022-12-30 thomas if (proc->type != PROC_AUTH) {
887 c669c489 2022-12-30 thomas err = got_error_fmt(GOT_ERR_BAD_PACKET,
888 c669c489 2022-12-30 thomas "authentication of uid %d from PID %d "
889 c669c489 2022-12-30 thomas "which is not the auth process",
890 2b3d32a1 2022-12-30 thomas proc->pid, client->euid);
894 62ee7d94 2023-01-10 thomas case GOTD_IMSG_CLIENT_SESSION_READY:
895 62ee7d94 2023-01-10 thomas if (proc->type != PROC_SESSION) {
896 62ee7d94 2023-01-10 thomas err = got_error_fmt(GOT_ERR_BAD_PACKET,
897 62ee7d94 2023-01-10 thomas "unexpected \"ready\" signal from PID %d",
898 62ee7d94 2023-01-10 thomas proc->pid);
902 85b37c72 2022-12-30 thomas case GOTD_IMSG_REPO_CHILD_READY:
903 85b37c72 2022-12-30 thomas if (proc->type != PROC_REPO_READ &&
904 85b37c72 2022-12-30 thomas proc->type != PROC_REPO_WRITE) {
905 85b37c72 2022-12-30 thomas err = got_error_fmt(GOT_ERR_BAD_PACKET,
906 85b37c72 2022-12-30 thomas "unexpected \"ready\" signal from PID %d",
907 85b37c72 2022-12-30 thomas proc->pid);
911 3efd8e31 2022-10-23 thomas case GOTD_IMSG_PACKFILE_DONE:
912 3efd8e31 2022-10-23 thomas err = ensure_proc_is_reading(client, proc);
914 3efd8e31 2022-10-23 thomas log_warnx("uid %d: %s", client->euid, err->msg);
918 3efd8e31 2022-10-23 thomas case GOTD_IMSG_PACKFILE_INSTALL:
919 3efd8e31 2022-10-23 thomas case GOTD_IMSG_REF_UPDATES_START:
920 3efd8e31 2022-10-23 thomas case GOTD_IMSG_REF_UPDATE:
921 3efd8e31 2022-10-23 thomas err = ensure_proc_is_writing(client, proc);
923 3efd8e31 2022-10-23 thomas log_warnx("uid %d: %s", client->euid, err->msg);
928 3efd8e31 2022-10-23 thomas log_debug("%s: unexpected imsg %d", __func__, imsg->hdr.type);
932 3efd8e31 2022-10-23 thomas return ret;
935 3efd8e31 2022-10-23 thomas static const struct got_error *
936 62ee7d94 2023-01-10 thomas connect_repo_child(struct gotd_client *client,
937 62ee7d94 2023-01-10 thomas struct gotd_child_proc *repo_proc)
939 85b37c72 2022-12-30 thomas static const struct got_error *err;
940 62ee7d94 2023-01-10 thomas struct gotd_imsgev *session_iev = &client->session->iev;
941 62ee7d94 2023-01-10 thomas struct gotd_imsg_connect_repo_child ireq;
942 62ee7d94 2023-01-10 thomas int pipe[2];
944 7b1db75e 2023-01-14 thomas if (client->state != GOTD_CLIENT_STATE_ACCESS_GRANTED)
945 62ee7d94 2023-01-10 thomas return got_error_msg(GOT_ERR_BAD_REQUEST,
946 62ee7d94 2023-01-10 thomas "unexpected repo child ready signal received");
948 62ee7d94 2023-01-10 thomas if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
949 62ee7d94 2023-01-10 thomas PF_UNSPEC, pipe) == -1)
950 62ee7d94 2023-01-10 thomas fatal("socketpair");
952 62ee7d94 2023-01-10 thomas memset(&ireq, 0, sizeof(ireq));
953 62ee7d94 2023-01-10 thomas ireq.client_id = client->id;
954 62ee7d94 2023-01-10 thomas ireq.proc_id = repo_proc->type;
956 62ee7d94 2023-01-10 thomas /* Pass repo child pipe to session child process. */
957 62ee7d94 2023-01-10 thomas if (gotd_imsg_compose_event(session_iev, GOTD_IMSG_CONNECT_REPO_CHILD,
958 62ee7d94 2023-01-10 thomas PROC_GOTD, pipe[0], &ireq, sizeof(ireq)) == -1) {
959 62ee7d94 2023-01-10 thomas err = got_error_from_errno("imsg compose CONNECT_REPO_CHILD");
960 62ee7d94 2023-01-10 thomas close(pipe[0]);
961 62ee7d94 2023-01-10 thomas close(pipe[1]);
962 62ee7d94 2023-01-10 thomas return err;
965 62ee7d94 2023-01-10 thomas /* Pass session child pipe to repo child process. */
966 62ee7d94 2023-01-10 thomas if (gotd_imsg_compose_event(&repo_proc->iev,
967 62ee7d94 2023-01-10 thomas GOTD_IMSG_CONNECT_REPO_CHILD, PROC_GOTD, pipe[1], NULL, 0) == -1) {
968 62ee7d94 2023-01-10 thomas err = got_error_from_errno("imsg compose CONNECT_REPO_CHILD");
969 62ee7d94 2023-01-10 thomas close(pipe[1]);
970 62ee7d94 2023-01-10 thomas return err;
973 3efd8e31 2022-10-23 thomas return NULL;
976 3efd8e31 2022-10-23 thomas static void
977 85b37c72 2022-12-30 thomas gotd_dispatch_listener(int fd, short event, void *arg)
979 3efd8e31 2022-10-23 thomas struct gotd_imsgev *iev = arg;
980 3efd8e31 2022-10-23 thomas struct imsgbuf *ibuf = &iev->ibuf;
981 85b37c72 2022-12-30 thomas struct gotd_child_proc *proc = &gotd.listen_proc;
982 85b37c72 2022-12-30 thomas ssize_t n;
983 85b37c72 2022-12-30 thomas int shut = 0;
984 85b37c72 2022-12-30 thomas struct imsg imsg;
986 85b37c72 2022-12-30 thomas if (proc->iev.ibuf.fd != fd)
987 85b37c72 2022-12-30 thomas fatalx("%s: unexpected fd %d", __func__, fd);
989 85b37c72 2022-12-30 thomas if (event & EV_READ) {
990 85b37c72 2022-12-30 thomas if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
991 85b37c72 2022-12-30 thomas fatal("imsg_read error");
992 85b37c72 2022-12-30 thomas if (n == 0) {
993 85b37c72 2022-12-30 thomas /* Connection closed. */
994 85b37c72 2022-12-30 thomas shut = 1;
995 85b37c72 2022-12-30 thomas goto done;
999 85b37c72 2022-12-30 thomas if (event & EV_WRITE) {
1000 85b37c72 2022-12-30 thomas n = msgbuf_write(&ibuf->w);
1001 85b37c72 2022-12-30 thomas if (n == -1 && errno != EAGAIN)
1002 85b37c72 2022-12-30 thomas fatal("msgbuf_write");
1003 85b37c72 2022-12-30 thomas if (n == 0) {
1004 85b37c72 2022-12-30 thomas /* Connection closed. */
1005 85b37c72 2022-12-30 thomas shut = 1;
1006 85b37c72 2022-12-30 thomas goto done;
1010 85b37c72 2022-12-30 thomas for (;;) {
1011 85b37c72 2022-12-30 thomas const struct got_error *err = NULL;
1012 85b37c72 2022-12-30 thomas struct gotd_client *client = NULL;
1013 85b37c72 2022-12-30 thomas uint32_t client_id = 0;
1014 85b37c72 2022-12-30 thomas int do_disconnect = 0;
1016 85b37c72 2022-12-30 thomas if ((n = imsg_get(ibuf, &imsg)) == -1)
1017 85b37c72 2022-12-30 thomas fatal("%s: imsg_get error", __func__);
1018 85b37c72 2022-12-30 thomas if (n == 0) /* No more messages. */
1021 85b37c72 2022-12-30 thomas switch (imsg.hdr.type) {
1022 85b37c72 2022-12-30 thomas case GOTD_IMSG_ERROR:
1023 85b37c72 2022-12-30 thomas do_disconnect = 1;
1024 85b37c72 2022-12-30 thomas err = gotd_imsg_recv_error(&client_id, &imsg);
1026 85b37c72 2022-12-30 thomas case GOTD_IMSG_CONNECT:
1027 85b37c72 2022-12-30 thomas err = recv_connect(&client_id, &imsg);
1029 85b37c72 2022-12-30 thomas default:
1030 85b37c72 2022-12-30 thomas log_debug("unexpected imsg %d", imsg.hdr.type);
1034 85b37c72 2022-12-30 thomas client = find_client(client_id);
1035 85b37c72 2022-12-30 thomas if (client == NULL) {
1036 85b37c72 2022-12-30 thomas log_warnx("%s: client not found", __func__);
1037 85b37c72 2022-12-30 thomas imsg_free(&imsg);
1038 85b37c72 2022-12-30 thomas continue;
1041 85b37c72 2022-12-30 thomas if (err)
1042 85b37c72 2022-12-30 thomas log_warnx("uid %d: %s", client->euid, err->msg);
1044 85b37c72 2022-12-30 thomas if (do_disconnect) {
1045 85b37c72 2022-12-30 thomas if (err)
1046 85b37c72 2022-12-30 thomas disconnect_on_error(client, err);
1048 85b37c72 2022-12-30 thomas disconnect(client);
1051 85b37c72 2022-12-30 thomas imsg_free(&imsg);
1054 85b37c72 2022-12-30 thomas if (!shut) {
1055 85b37c72 2022-12-30 thomas gotd_imsg_event_add(iev);
1056 85b37c72 2022-12-30 thomas } else {
1057 85b37c72 2022-12-30 thomas /* This pipe is dead. Remove its event handler */
1058 85b37c72 2022-12-30 thomas event_del(&iev->ev);
1059 85b37c72 2022-12-30 thomas event_loopexit(NULL);
1063 85b37c72 2022-12-30 thomas static void
1064 c669c489 2022-12-30 thomas gotd_dispatch_auth_child(int fd, short event, void *arg)
1066 c669c489 2022-12-30 thomas const struct got_error *err = NULL;
1067 c669c489 2022-12-30 thomas struct gotd_imsgev *iev = arg;
1068 c669c489 2022-12-30 thomas struct imsgbuf *ibuf = &iev->ibuf;
1069 c669c489 2022-12-30 thomas struct gotd_client *client;
1070 c669c489 2022-12-30 thomas struct gotd_repo *repo = NULL;
1071 c669c489 2022-12-30 thomas ssize_t n;
1072 c669c489 2022-12-30 thomas int shut = 0;
1073 c669c489 2022-12-30 thomas struct imsg imsg;
1074 c669c489 2022-12-30 thomas uint32_t client_id = 0;
1075 c669c489 2022-12-30 thomas int do_disconnect = 0;
1077 c669c489 2022-12-30 thomas client = find_client_by_proc_fd(fd);
1078 c669c489 2022-12-30 thomas if (client == NULL)
1079 c669c489 2022-12-30 thomas fatalx("cannot find client for fd %d", fd);
1081 c669c489 2022-12-30 thomas if (client->auth == NULL)
1082 c669c489 2022-12-30 thomas fatalx("cannot find auth child process for fd %d", fd);
1084 c669c489 2022-12-30 thomas if (event & EV_READ) {
1085 c669c489 2022-12-30 thomas if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1086 c669c489 2022-12-30 thomas fatal("imsg_read error");
1087 c669c489 2022-12-30 thomas if (n == 0) {
1088 c669c489 2022-12-30 thomas /* Connection closed. */
1089 c669c489 2022-12-30 thomas shut = 1;
1090 c669c489 2022-12-30 thomas goto done;
1094 c669c489 2022-12-30 thomas if (event & EV_WRITE) {
1095 c669c489 2022-12-30 thomas n = msgbuf_write(&ibuf->w);
1096 c669c489 2022-12-30 thomas if (n == -1 && errno != EAGAIN)
1097 c669c489 2022-12-30 thomas fatal("msgbuf_write");
1098 c669c489 2022-12-30 thomas if (n == 0) {
1099 c669c489 2022-12-30 thomas /* Connection closed. */
1100 c669c489 2022-12-30 thomas shut = 1;
1102 c669c489 2022-12-30 thomas goto done;
1105 c669c489 2022-12-30 thomas if (client->auth->iev.ibuf.fd != fd)
1106 c669c489 2022-12-30 thomas fatalx("%s: unexpected fd %d", __func__, fd);
1108 c669c489 2022-12-30 thomas if ((n = imsg_get(ibuf, &imsg)) == -1)
1109 c669c489 2022-12-30 thomas fatal("%s: imsg_get error", __func__);
1110 c669c489 2022-12-30 thomas if (n == 0) /* No more messages. */
1113 c669c489 2022-12-30 thomas evtimer_del(&client->tmo);
1115 c669c489 2022-12-30 thomas switch (imsg.hdr.type) {
1116 c669c489 2022-12-30 thomas case GOTD_IMSG_ERROR:
1117 c669c489 2022-12-30 thomas do_disconnect = 1;
1118 c669c489 2022-12-30 thomas err = gotd_imsg_recv_error(&client_id, &imsg);
1120 c669c489 2022-12-30 thomas case GOTD_IMSG_ACCESS_GRANTED:
1121 7b1db75e 2023-01-14 thomas client->state = GOTD_CLIENT_STATE_ACCESS_GRANTED;
1123 c669c489 2022-12-30 thomas default:
1124 c669c489 2022-12-30 thomas do_disconnect = 1;
1125 c669c489 2022-12-30 thomas log_debug("unexpected imsg %d", imsg.hdr.type);
1129 c669c489 2022-12-30 thomas if (!verify_imsg_src(client, client->auth, &imsg)) {
1130 c669c489 2022-12-30 thomas do_disconnect = 1;
1131 c669c489 2022-12-30 thomas log_debug("dropping imsg type %d from PID %d",
1132 c669c489 2022-12-30 thomas imsg.hdr.type, client->auth->pid);
1134 c669c489 2022-12-30 thomas imsg_free(&imsg);
1136 c669c489 2022-12-30 thomas if (do_disconnect) {
1137 c669c489 2022-12-30 thomas if (err)
1138 c669c489 2022-12-30 thomas disconnect_on_error(client, err);
1140 c669c489 2022-12-30 thomas disconnect(client);
1141 c669c489 2022-12-30 thomas goto done;
1144 c669c489 2022-12-30 thomas repo = find_repo_by_name(client->auth->repo_name);
1145 c669c489 2022-12-30 thomas if (repo == NULL) {
1146 c669c489 2022-12-30 thomas err = got_error(GOT_ERR_NOT_GIT_REPO);
1147 c669c489 2022-12-30 thomas goto done;
1149 c669c489 2022-12-30 thomas kill_auth_proc(client);
1151 e17294f7 2023-01-27 thomas log_info("authenticated uid %d for repository %s",
1152 c669c489 2022-12-30 thomas client->euid, repo->name);
1154 62ee7d94 2023-01-10 thomas err = start_session_child(client, repo, gotd.argv0,
1155 46ecc01f 2022-12-30 thomas gotd.confpath, gotd.daemonize, gotd.verbosity);
1156 62ee7d94 2023-01-10 thomas if (err)
1157 62ee7d94 2023-01-10 thomas goto done;
1159 c669c489 2022-12-30 thomas if (err)
1160 c669c489 2022-12-30 thomas log_warnx("uid %d: %s", client->euid, err->msg);
1162 c669c489 2022-12-30 thomas /* We might have killed the auth process by now. */
1163 c669c489 2022-12-30 thomas if (client->auth != NULL) {
1164 c669c489 2022-12-30 thomas if (!shut) {
1165 c669c489 2022-12-30 thomas gotd_imsg_event_add(iev);
1166 c669c489 2022-12-30 thomas } else {
1167 c669c489 2022-12-30 thomas /* This pipe is dead. Remove its event handler */
1168 c669c489 2022-12-30 thomas event_del(&iev->ev);
1173 62ee7d94 2023-01-10 thomas static const struct got_error *
1174 62ee7d94 2023-01-10 thomas connect_session(struct gotd_client *client)
1176 62ee7d94 2023-01-10 thomas const struct got_error *err = NULL;
1177 62ee7d94 2023-01-10 thomas struct gotd_imsg_connect iconnect;
1180 62ee7d94 2023-01-10 thomas memset(&iconnect, 0, sizeof(iconnect));
1182 62ee7d94 2023-01-10 thomas s = dup(client->fd);
1183 62ee7d94 2023-01-10 thomas if (s == -1)
1184 62ee7d94 2023-01-10 thomas return got_error_from_errno("dup");
1186 62ee7d94 2023-01-10 thomas iconnect.client_id = client->id;
1187 62ee7d94 2023-01-10 thomas iconnect.euid = client->euid;
1188 62ee7d94 2023-01-10 thomas iconnect.egid = client->egid;
1190 62ee7d94 2023-01-10 thomas if (gotd_imsg_compose_event(&client->session->iev, GOTD_IMSG_CONNECT,
1191 62ee7d94 2023-01-10 thomas PROC_GOTD, s, &iconnect, sizeof(iconnect)) == -1) {
1192 62ee7d94 2023-01-10 thomas err = got_error_from_errno("imsg compose CONNECT");
1193 62ee7d94 2023-01-10 thomas close(s);
1194 62ee7d94 2023-01-10 thomas return err;
1198 62ee7d94 2023-01-10 thomas * We are no longer interested in messages from this client.
1199 62ee7d94 2023-01-10 thomas * Further client requests will be handled by the session process.
1201 62ee7d94 2023-01-10 thomas msgbuf_clear(&client->iev.ibuf.w);
1202 62ee7d94 2023-01-10 thomas imsg_clear(&client->iev.ibuf);
1203 62ee7d94 2023-01-10 thomas event_del(&client->iev.ev);
1204 62ee7d94 2023-01-10 thomas client->fd = -1; /* will be closed via copy in client->iev.ibuf.fd */
1206 62ee7d94 2023-01-10 thomas return NULL;
1209 c669c489 2022-12-30 thomas static void
1210 62ee7d94 2023-01-10 thomas gotd_dispatch_client_session(int fd, short event, void *arg)
1212 85b37c72 2022-12-30 thomas struct gotd_imsgev *iev = arg;
1213 85b37c72 2022-12-30 thomas struct imsgbuf *ibuf = &iev->ibuf;
1214 3efd8e31 2022-10-23 thomas struct gotd_child_proc *proc = NULL;
1215 85b37c72 2022-12-30 thomas struct gotd_client *client = NULL;
1216 3efd8e31 2022-10-23 thomas ssize_t n;
1217 3efd8e31 2022-10-23 thomas int shut = 0;
1218 3efd8e31 2022-10-23 thomas struct imsg imsg;
1220 62ee7d94 2023-01-10 thomas client = find_client_by_proc_fd(fd);
1221 62ee7d94 2023-01-10 thomas if (client == NULL)
1222 62ee7d94 2023-01-10 thomas fatalx("cannot find client for fd %d", fd);
1224 3efd8e31 2022-10-23 thomas if (event & EV_READ) {
1225 3efd8e31 2022-10-23 thomas if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1226 3efd8e31 2022-10-23 thomas fatal("imsg_read error");
1227 3efd8e31 2022-10-23 thomas if (n == 0) {
1228 3efd8e31 2022-10-23 thomas /* Connection closed. */
1229 3efd8e31 2022-10-23 thomas shut = 1;
1230 3efd8e31 2022-10-23 thomas goto done;
1234 3efd8e31 2022-10-23 thomas if (event & EV_WRITE) {
1235 3efd8e31 2022-10-23 thomas n = msgbuf_write(&ibuf->w);
1236 3efd8e31 2022-10-23 thomas if (n == -1 && errno != EAGAIN)
1237 3efd8e31 2022-10-23 thomas fatal("msgbuf_write");
1238 3efd8e31 2022-10-23 thomas if (n == 0) {
1239 3efd8e31 2022-10-23 thomas /* Connection closed. */
1240 3efd8e31 2022-10-23 thomas shut = 1;
1241 3efd8e31 2022-10-23 thomas goto done;
1245 62ee7d94 2023-01-10 thomas proc = client->session;
1246 62ee7d94 2023-01-10 thomas if (proc == NULL)
1247 62ee7d94 2023-01-10 thomas fatalx("cannot find session child process for fd %d", fd);
1249 62ee7d94 2023-01-10 thomas for (;;) {
1250 62ee7d94 2023-01-10 thomas const struct got_error *err = NULL;
1251 62ee7d94 2023-01-10 thomas uint32_t client_id = 0;
1252 62ee7d94 2023-01-10 thomas int do_disconnect = 0, do_start_repo_child = 0;
1254 62ee7d94 2023-01-10 thomas if ((n = imsg_get(ibuf, &imsg)) == -1)
1255 62ee7d94 2023-01-10 thomas fatal("%s: imsg_get error", __func__);
1256 62ee7d94 2023-01-10 thomas if (n == 0) /* No more messages. */
1259 62ee7d94 2023-01-10 thomas switch (imsg.hdr.type) {
1260 62ee7d94 2023-01-10 thomas case GOTD_IMSG_ERROR:
1261 62ee7d94 2023-01-10 thomas do_disconnect = 1;
1262 62ee7d94 2023-01-10 thomas err = gotd_imsg_recv_error(&client_id, &imsg);
1264 62ee7d94 2023-01-10 thomas case GOTD_IMSG_CLIENT_SESSION_READY:
1265 7b1db75e 2023-01-14 thomas if (client->state != GOTD_CLIENT_STATE_ACCESS_GRANTED) {
1266 62ee7d94 2023-01-10 thomas err = got_error(GOT_ERR_PRIVSEP_MSG);
1269 62ee7d94 2023-01-10 thomas do_start_repo_child = 1;
1271 62ee7d94 2023-01-10 thomas case GOTD_IMSG_DISCONNECT:
1272 62ee7d94 2023-01-10 thomas do_disconnect = 1;
1274 62ee7d94 2023-01-10 thomas default:
1275 62ee7d94 2023-01-10 thomas log_debug("unexpected imsg %d", imsg.hdr.type);
1279 62ee7d94 2023-01-10 thomas if (!verify_imsg_src(client, proc, &imsg)) {
1280 62ee7d94 2023-01-10 thomas log_debug("dropping imsg type %d from PID %d",
1281 62ee7d94 2023-01-10 thomas imsg.hdr.type, proc->pid);
1282 62ee7d94 2023-01-10 thomas imsg_free(&imsg);
1283 62ee7d94 2023-01-10 thomas continue;
1285 62ee7d94 2023-01-10 thomas if (err)
1286 62ee7d94 2023-01-10 thomas log_warnx("uid %d: %s", client->euid, err->msg);
1288 62ee7d94 2023-01-10 thomas if (do_start_repo_child) {
1289 62ee7d94 2023-01-10 thomas struct gotd_repo *repo;
1291 62ee7d94 2023-01-10 thomas repo = find_repo_by_name(client->session->repo_name);
1292 62ee7d94 2023-01-10 thomas if (repo != NULL) {
1293 62ee7d94 2023-01-10 thomas enum gotd_procid proc_type;
1295 62ee7d94 2023-01-10 thomas if (client->required_auth & GOTD_AUTH_WRITE)
1296 62ee7d94 2023-01-10 thomas proc_type = PROC_REPO_WRITE;
1298 62ee7d94 2023-01-10 thomas proc_type = PROC_REPO_READ;
1300 62ee7d94 2023-01-10 thomas err = start_repo_child(client, proc_type, repo,
1301 62ee7d94 2023-01-10 thomas gotd.argv0, gotd.confpath, gotd.daemonize,
1302 62ee7d94 2023-01-10 thomas gotd.verbosity);
1304 62ee7d94 2023-01-10 thomas err = got_error(GOT_ERR_NOT_GIT_REPO);
1306 62ee7d94 2023-01-10 thomas if (err) {
1307 62ee7d94 2023-01-10 thomas log_warnx("uid %d: %s", client->euid, err->msg);
1308 62ee7d94 2023-01-10 thomas do_disconnect = 1;
1312 62ee7d94 2023-01-10 thomas if (do_disconnect) {
1313 62ee7d94 2023-01-10 thomas if (err)
1314 62ee7d94 2023-01-10 thomas disconnect_on_error(client, err);
1316 62ee7d94 2023-01-10 thomas disconnect(client);
1319 62ee7d94 2023-01-10 thomas imsg_free(&imsg);
1322 62ee7d94 2023-01-10 thomas if (!shut) {
1323 62ee7d94 2023-01-10 thomas gotd_imsg_event_add(iev);
1324 62ee7d94 2023-01-10 thomas } else {
1325 62ee7d94 2023-01-10 thomas /* This pipe is dead. Remove its event handler */
1326 62ee7d94 2023-01-10 thomas event_del(&iev->ev);
1327 62ee7d94 2023-01-10 thomas disconnect(client);
1331 62ee7d94 2023-01-10 thomas static void
1332 62ee7d94 2023-01-10 thomas gotd_dispatch_repo_child(int fd, short event, void *arg)
1334 62ee7d94 2023-01-10 thomas struct gotd_imsgev *iev = arg;
1335 62ee7d94 2023-01-10 thomas struct imsgbuf *ibuf = &iev->ibuf;
1336 62ee7d94 2023-01-10 thomas struct gotd_child_proc *proc = NULL;
1337 62ee7d94 2023-01-10 thomas struct gotd_client *client;
1338 62ee7d94 2023-01-10 thomas ssize_t n;
1339 62ee7d94 2023-01-10 thomas int shut = 0;
1340 62ee7d94 2023-01-10 thomas struct imsg imsg;
1342 85b37c72 2022-12-30 thomas client = find_client_by_proc_fd(fd);
1343 85b37c72 2022-12-30 thomas if (client == NULL)
1344 85b37c72 2022-12-30 thomas fatalx("cannot find client for fd %d", fd);
1346 62ee7d94 2023-01-10 thomas if (event & EV_READ) {
1347 62ee7d94 2023-01-10 thomas if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1348 62ee7d94 2023-01-10 thomas fatal("imsg_read error");
1349 62ee7d94 2023-01-10 thomas if (n == 0) {
1350 62ee7d94 2023-01-10 thomas /* Connection closed. */
1351 62ee7d94 2023-01-10 thomas shut = 1;
1352 62ee7d94 2023-01-10 thomas goto done;
1356 62ee7d94 2023-01-10 thomas if (event & EV_WRITE) {
1357 62ee7d94 2023-01-10 thomas n = msgbuf_write(&ibuf->w);
1358 62ee7d94 2023-01-10 thomas if (n == -1 && errno != EAGAIN)
1359 62ee7d94 2023-01-10 thomas fatal("msgbuf_write");
1360 62ee7d94 2023-01-10 thomas if (n == 0) {
1361 62ee7d94 2023-01-10 thomas /* Connection closed. */
1362 62ee7d94 2023-01-10 thomas shut = 1;
1363 62ee7d94 2023-01-10 thomas goto done;
1367 27b11d77 2023-01-14 thomas proc = client->repo;
1368 3efd8e31 2022-10-23 thomas if (proc == NULL)
1369 3efd8e31 2022-10-23 thomas fatalx("cannot find child process for fd %d", fd);
1371 3efd8e31 2022-10-23 thomas for (;;) {
1372 3efd8e31 2022-10-23 thomas const struct got_error *err = NULL;
1373 3efd8e31 2022-10-23 thomas uint32_t client_id = 0;
1374 3efd8e31 2022-10-23 thomas int do_disconnect = 0;
1376 3efd8e31 2022-10-23 thomas if ((n = imsg_get(ibuf, &imsg)) == -1)
1377 3efd8e31 2022-10-23 thomas fatal("%s: imsg_get error", __func__);
1378 3efd8e31 2022-10-23 thomas if (n == 0) /* No more messages. */
1381 3efd8e31 2022-10-23 thomas switch (imsg.hdr.type) {
1382 3efd8e31 2022-10-23 thomas case GOTD_IMSG_ERROR:
1383 3efd8e31 2022-10-23 thomas do_disconnect = 1;
1384 3efd8e31 2022-10-23 thomas err = gotd_imsg_recv_error(&client_id, &imsg);
1386 85b37c72 2022-12-30 thomas case GOTD_IMSG_REPO_CHILD_READY:
1387 62ee7d94 2023-01-10 thomas err = connect_session(client);
1388 62ee7d94 2023-01-10 thomas if (err)
1390 62ee7d94 2023-01-10 thomas err = connect_repo_child(client, proc);
1392 3efd8e31 2022-10-23 thomas default:
1393 3efd8e31 2022-10-23 thomas log_debug("unexpected imsg %d", imsg.hdr.type);
1397 3efd8e31 2022-10-23 thomas if (!verify_imsg_src(client, proc, &imsg)) {
1398 3efd8e31 2022-10-23 thomas log_debug("dropping imsg type %d from PID %d",
1399 3efd8e31 2022-10-23 thomas imsg.hdr.type, proc->pid);
1400 3efd8e31 2022-10-23 thomas imsg_free(&imsg);
1401 3efd8e31 2022-10-23 thomas continue;
1403 3efd8e31 2022-10-23 thomas if (err)
1404 3efd8e31 2022-10-23 thomas log_warnx("uid %d: %s", client->euid, err->msg);
1406 3efd8e31 2022-10-23 thomas if (do_disconnect) {
1407 3efd8e31 2022-10-23 thomas if (err)
1408 3efd8e31 2022-10-23 thomas disconnect_on_error(client, err);
1410 3efd8e31 2022-10-23 thomas disconnect(client);
1413 3efd8e31 2022-10-23 thomas imsg_free(&imsg);
1416 3efd8e31 2022-10-23 thomas if (!shut) {
1417 3efd8e31 2022-10-23 thomas gotd_imsg_event_add(iev);
1418 3efd8e31 2022-10-23 thomas } else {
1419 3efd8e31 2022-10-23 thomas /* This pipe is dead. Remove its event handler */
1420 3efd8e31 2022-10-23 thomas event_del(&iev->ev);
1421 62ee7d94 2023-01-10 thomas disconnect(client);
1425 3efd8e31 2022-10-23 thomas static pid_t
1426 414e37cb 2022-12-30 thomas start_child(enum gotd_procid proc_id, const char *repo_path,
1427 832b8374 2022-10-31 thomas char *argv0, const char *confpath, int fd, int daemonize, int verbosity)
1429 832b8374 2022-10-31 thomas char *argv[11];
1430 3efd8e31 2022-10-23 thomas int argc = 0;
1431 3efd8e31 2022-10-23 thomas pid_t pid;
1433 3efd8e31 2022-10-23 thomas switch (pid = fork()) {
1434 3efd8e31 2022-10-23 thomas case -1:
1435 3efd8e31 2022-10-23 thomas fatal("cannot fork");
1438 3efd8e31 2022-10-23 thomas default:
1439 3efd8e31 2022-10-23 thomas close(fd);
1440 3efd8e31 2022-10-23 thomas return pid;
1443 bb3a6ce9 2022-11-17 thomas if (fd != GOTD_FILENO_MSG_PIPE) {
1444 bb3a6ce9 2022-11-17 thomas if (dup2(fd, GOTD_FILENO_MSG_PIPE) == -1)
1445 3efd8e31 2022-10-23 thomas fatal("cannot setup imsg fd");
1446 3efd8e31 2022-10-23 thomas } else if (fcntl(fd, F_SETFD, 0) == -1)
1447 3efd8e31 2022-10-23 thomas fatal("cannot setup imsg fd");
1449 3efd8e31 2022-10-23 thomas argv[argc++] = argv0;
1450 3efd8e31 2022-10-23 thomas switch (proc_id) {
1451 2b3d32a1 2022-12-30 thomas case PROC_LISTEN:
1452 2b3d32a1 2022-12-30 thomas argv[argc++] = (char *)"-L";
1454 c669c489 2022-12-30 thomas case PROC_AUTH:
1455 c669c489 2022-12-30 thomas argv[argc++] = (char *)"-A";
1457 62ee7d94 2023-01-10 thomas case PROC_SESSION:
1458 62ee7d94 2023-01-10 thomas argv[argc++] = (char *)"-S";
1460 3efd8e31 2022-10-23 thomas case PROC_REPO_READ:
1461 3efd8e31 2022-10-23 thomas argv[argc++] = (char *)"-R";
1463 3efd8e31 2022-10-23 thomas case PROC_REPO_WRITE:
1464 3efd8e31 2022-10-23 thomas argv[argc++] = (char *)"-W";
1466 3efd8e31 2022-10-23 thomas default:
1467 3efd8e31 2022-10-23 thomas fatalx("invalid process id %d", proc_id);
1470 832b8374 2022-10-31 thomas argv[argc++] = (char *)"-f";
1471 832b8374 2022-10-31 thomas argv[argc++] = (char *)confpath;
1473 414e37cb 2022-12-30 thomas if (repo_path) {
1474 2b3d32a1 2022-12-30 thomas argv[argc++] = (char *)"-P";
1475 414e37cb 2022-12-30 thomas argv[argc++] = (char *)repo_path;
1478 3efd8e31 2022-10-23 thomas if (!daemonize)
1479 3efd8e31 2022-10-23 thomas argv[argc++] = (char *)"-d";
1480 3efd8e31 2022-10-23 thomas if (verbosity > 0)
1481 3efd8e31 2022-10-23 thomas argv[argc++] = (char *)"-v";
1482 3efd8e31 2022-10-23 thomas if (verbosity > 1)
1483 3efd8e31 2022-10-23 thomas argv[argc++] = (char *)"-v";
1484 3efd8e31 2022-10-23 thomas argv[argc++] = NULL;
1486 3efd8e31 2022-10-23 thomas execvp(argv0, argv);
1487 3efd8e31 2022-10-23 thomas fatal("execvp");
1490 3efd8e31 2022-10-23 thomas static void
1491 2b3d32a1 2022-12-30 thomas start_listener(char *argv0, const char *confpath, int daemonize, int verbosity)
1493 85b37c72 2022-12-30 thomas struct gotd_child_proc *proc = &gotd.listen_proc;
1495 2b3d32a1 2022-12-30 thomas proc->type = PROC_LISTEN;
1497 2b3d32a1 2022-12-30 thomas if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1498 2b3d32a1 2022-12-30 thomas PF_UNSPEC, proc->pipe) == -1)
1499 2b3d32a1 2022-12-30 thomas fatal("socketpair");
1501 2b3d32a1 2022-12-30 thomas proc->pid = start_child(proc->type, NULL, argv0, confpath,
1502 2b3d32a1 2022-12-30 thomas proc->pipe[1], daemonize, verbosity);
1503 2b3d32a1 2022-12-30 thomas imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1504 85b37c72 2022-12-30 thomas proc->iev.handler = gotd_dispatch_listener;
1505 2b3d32a1 2022-12-30 thomas proc->iev.events = EV_READ;
1506 2b3d32a1 2022-12-30 thomas proc->iev.handler_arg = NULL;
1509 85b37c72 2022-12-30 thomas static const struct got_error *
1510 62ee7d94 2023-01-10 thomas start_session_child(struct gotd_client *client, struct gotd_repo *repo,
1511 62ee7d94 2023-01-10 thomas char *argv0, const char *confpath, int daemonize, int verbosity)
1513 62ee7d94 2023-01-10 thomas struct gotd_child_proc *proc;
1515 62ee7d94 2023-01-10 thomas proc = calloc(1, sizeof(*proc));
1516 62ee7d94 2023-01-10 thomas if (proc == NULL)
1517 62ee7d94 2023-01-10 thomas return got_error_from_errno("calloc");
1519 62ee7d94 2023-01-10 thomas proc->type = PROC_SESSION;
1520 62ee7d94 2023-01-10 thomas if (strlcpy(proc->repo_name, repo->name,
1521 62ee7d94 2023-01-10 thomas sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1522 62ee7d94 2023-01-10 thomas fatalx("repository name too long: %s", repo->name);
1523 62ee7d94 2023-01-10 thomas log_debug("starting client uid %d session for repository %s",
1524 62ee7d94 2023-01-10 thomas client->euid, repo->name);
1525 62ee7d94 2023-01-10 thomas if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1526 62ee7d94 2023-01-10 thomas sizeof(proc->repo_path))
1527 62ee7d94 2023-01-10 thomas fatalx("repository path too long: %s", repo->path);
1528 62ee7d94 2023-01-10 thomas if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1529 62ee7d94 2023-01-10 thomas PF_UNSPEC, proc->pipe) == -1)
1530 62ee7d94 2023-01-10 thomas fatal("socketpair");
1531 62ee7d94 2023-01-10 thomas proc->pid = start_child(proc->type, proc->repo_path, argv0,
1532 62ee7d94 2023-01-10 thomas confpath, proc->pipe[1], daemonize, verbosity);
1533 62ee7d94 2023-01-10 thomas imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1534 62ee7d94 2023-01-10 thomas log_debug("proc %s %s is on fd %d",
1535 62ee7d94 2023-01-10 thomas gotd_proc_names[proc->type], proc->repo_path,
1536 62ee7d94 2023-01-10 thomas proc->pipe[0]);
1537 62ee7d94 2023-01-10 thomas proc->iev.handler = gotd_dispatch_client_session;
1538 62ee7d94 2023-01-10 thomas proc->iev.events = EV_READ;
1539 62ee7d94 2023-01-10 thomas proc->iev.handler_arg = NULL;
1540 62ee7d94 2023-01-10 thomas event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1541 62ee7d94 2023-01-10 thomas gotd_dispatch_client_session, &proc->iev);
1542 62ee7d94 2023-01-10 thomas gotd_imsg_event_add(&proc->iev);
1544 62ee7d94 2023-01-10 thomas client->session = proc;
1545 62ee7d94 2023-01-10 thomas return NULL;
1548 62ee7d94 2023-01-10 thomas static const struct got_error *
1549 85b37c72 2022-12-30 thomas start_repo_child(struct gotd_client *client, enum gotd_procid proc_type,
1550 85b37c72 2022-12-30 thomas struct gotd_repo *repo, char *argv0, const char *confpath,
1551 832b8374 2022-10-31 thomas int daemonize, int verbosity)
1553 3efd8e31 2022-10-23 thomas struct gotd_child_proc *proc;
1555 85b37c72 2022-12-30 thomas if (proc_type != PROC_REPO_READ && proc_type != PROC_REPO_WRITE)
1556 85b37c72 2022-12-30 thomas return got_error_msg(GOT_ERR_NOT_IMPL, "bad process type");
1558 85b37c72 2022-12-30 thomas proc = calloc(1, sizeof(*proc));
1559 85b37c72 2022-12-30 thomas if (proc == NULL)
1560 85b37c72 2022-12-30 thomas return got_error_from_errno("calloc");
1562 85b37c72 2022-12-30 thomas proc->type = proc_type;
1563 85b37c72 2022-12-30 thomas if (strlcpy(proc->repo_name, repo->name,
1564 85b37c72 2022-12-30 thomas sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1565 85b37c72 2022-12-30 thomas fatalx("repository name too long: %s", repo->name);
1566 85b37c72 2022-12-30 thomas log_debug("starting %s for repository %s",
1567 85b37c72 2022-12-30 thomas proc->type == PROC_REPO_READ ? "reader" : "writer", repo->name);
1568 fe6a8988 2023-01-08 thomas if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1569 fe6a8988 2023-01-08 thomas sizeof(proc->repo_path))
1570 fe6a8988 2023-01-08 thomas fatalx("repository path too long: %s", repo->path);
1571 85b37c72 2022-12-30 thomas if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1572 85b37c72 2022-12-30 thomas PF_UNSPEC, proc->pipe) == -1)
1573 85b37c72 2022-12-30 thomas fatal("socketpair");
1574 85b37c72 2022-12-30 thomas proc->pid = start_child(proc->type, proc->repo_path, argv0,
1575 85b37c72 2022-12-30 thomas confpath, proc->pipe[1], daemonize, verbosity);
1576 85b37c72 2022-12-30 thomas imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1577 85b37c72 2022-12-30 thomas log_debug("proc %s %s is on fd %d",
1578 85b37c72 2022-12-30 thomas gotd_proc_names[proc->type], proc->repo_path,
1579 85b37c72 2022-12-30 thomas proc->pipe[0]);
1580 85b37c72 2022-12-30 thomas proc->iev.handler = gotd_dispatch_repo_child;
1581 85b37c72 2022-12-30 thomas proc->iev.events = EV_READ;
1582 85b37c72 2022-12-30 thomas proc->iev.handler_arg = NULL;
1583 85b37c72 2022-12-30 thomas event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1584 85b37c72 2022-12-30 thomas gotd_dispatch_repo_child, &proc->iev);
1585 85b37c72 2022-12-30 thomas gotd_imsg_event_add(&proc->iev);
1587 27b11d77 2023-01-14 thomas client->repo = proc;
1588 c669c489 2022-12-30 thomas return NULL;
1591 c669c489 2022-12-30 thomas static const struct got_error *
1592 c669c489 2022-12-30 thomas start_auth_child(struct gotd_client *client, int required_auth,
1593 c669c489 2022-12-30 thomas struct gotd_repo *repo, char *argv0, const char *confpath,
1594 c669c489 2022-12-30 thomas int daemonize, int verbosity)
1596 0bcde4c8 2022-12-30 thomas const struct got_error *err = NULL;
1597 c669c489 2022-12-30 thomas struct gotd_child_proc *proc;
1598 c669c489 2022-12-30 thomas struct gotd_imsg_auth iauth;
1601 c669c489 2022-12-30 thomas memset(&iauth, 0, sizeof(iauth));
1603 0bcde4c8 2022-12-30 thomas fd = dup(client->fd);
1604 0bcde4c8 2022-12-30 thomas if (fd == -1)
1605 0bcde4c8 2022-12-30 thomas return got_error_from_errno("dup");
1607 c669c489 2022-12-30 thomas proc = calloc(1, sizeof(*proc));
1608 0bcde4c8 2022-12-30 thomas if (proc == NULL) {
1609 0bcde4c8 2022-12-30 thomas err = got_error_from_errno("calloc");
1610 0bcde4c8 2022-12-30 thomas close(fd);
1611 0bcde4c8 2022-12-30 thomas return err;
1614 c669c489 2022-12-30 thomas proc->type = PROC_AUTH;
1615 c669c489 2022-12-30 thomas if (strlcpy(proc->repo_name, repo->name,
1616 c669c489 2022-12-30 thomas sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1617 c669c489 2022-12-30 thomas fatalx("repository name too long: %s", repo->name);
1618 c669c489 2022-12-30 thomas log_debug("starting auth for uid %d repository %s",
1619 c669c489 2022-12-30 thomas client->euid, repo->name);
1620 fe6a8988 2023-01-08 thomas if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1621 fe6a8988 2023-01-08 thomas sizeof(proc->repo_path))
1622 fe6a8988 2023-01-08 thomas fatalx("repository path too long: %s", repo->path);
1623 c669c489 2022-12-30 thomas if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1624 c669c489 2022-12-30 thomas PF_UNSPEC, proc->pipe) == -1)
1625 c669c489 2022-12-30 thomas fatal("socketpair");
1626 c669c489 2022-12-30 thomas proc->pid = start_child(proc->type, proc->repo_path, argv0,
1627 c669c489 2022-12-30 thomas confpath, proc->pipe[1], daemonize, verbosity);
1628 c669c489 2022-12-30 thomas imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1629 c669c489 2022-12-30 thomas log_debug("proc %s %s is on fd %d",
1630 c669c489 2022-12-30 thomas gotd_proc_names[proc->type], proc->repo_path,
1631 c669c489 2022-12-30 thomas proc->pipe[0]);
1632 c669c489 2022-12-30 thomas proc->iev.handler = gotd_dispatch_auth_child;
1633 c669c489 2022-12-30 thomas proc->iev.events = EV_READ;
1634 c669c489 2022-12-30 thomas proc->iev.handler_arg = NULL;
1635 c669c489 2022-12-30 thomas event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1636 c669c489 2022-12-30 thomas gotd_dispatch_auth_child, &proc->iev);
1637 c669c489 2022-12-30 thomas gotd_imsg_event_add(&proc->iev);
1639 c669c489 2022-12-30 thomas iauth.euid = client->euid;
1640 c669c489 2022-12-30 thomas iauth.egid = client->egid;
1641 c669c489 2022-12-30 thomas iauth.required_auth = required_auth;
1642 c669c489 2022-12-30 thomas iauth.client_id = client->id;
1643 c669c489 2022-12-30 thomas if (gotd_imsg_compose_event(&proc->iev, GOTD_IMSG_AUTHENTICATE,
1644 0bcde4c8 2022-12-30 thomas PROC_GOTD, fd, &iauth, sizeof(iauth)) == -1) {
1645 c669c489 2022-12-30 thomas log_warn("imsg compose AUTHENTICATE");
1646 0bcde4c8 2022-12-30 thomas close(fd);
1647 0bcde4c8 2022-12-30 thomas /* Let the auth_timeout handler tidy up. */
1650 c669c489 2022-12-30 thomas client->auth = proc;
1651 c669c489 2022-12-30 thomas client->required_auth = required_auth;
1652 85b37c72 2022-12-30 thomas return NULL;
1655 414e37cb 2022-12-30 thomas static void
1656 414e37cb 2022-12-30 thomas apply_unveil_repo_readonly(const char *repo_path)
1658 414e37cb 2022-12-30 thomas if (unveil(repo_path, "r") == -1)
1659 414e37cb 2022-12-30 thomas fatal("unveil %s", repo_path);
1661 b942ab08 2022-12-30 thomas if (unveil(NULL, NULL) == -1)
1662 b942ab08 2022-12-30 thomas fatal("unveil");
1665 b942ab08 2022-12-30 thomas static void
1666 62ee7d94 2023-01-10 thomas apply_unveil_repo_readwrite(const char *repo_path)
1668 62ee7d94 2023-01-10 thomas if (unveil(repo_path, "rwc") == -1)
1669 62ee7d94 2023-01-10 thomas fatal("unveil %s", repo_path);
1671 62ee7d94 2023-01-10 thomas if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
1672 62ee7d94 2023-01-10 thomas fatal("unveil %s", GOT_TMPDIR_STR);
1674 62ee7d94 2023-01-10 thomas if (unveil(NULL, NULL) == -1)
1675 62ee7d94 2023-01-10 thomas fatal("unveil");
1678 62ee7d94 2023-01-10 thomas static void
1679 b942ab08 2022-12-30 thomas apply_unveil_none(void)
1681 b942ab08 2022-12-30 thomas if (unveil("/", "") == -1)
1682 b942ab08 2022-12-30 thomas fatal("unveil");
1684 414e37cb 2022-12-30 thomas if (unveil(NULL, NULL) == -1)
1685 414e37cb 2022-12-30 thomas fatal("unveil");
1688 3efd8e31 2022-10-23 thomas static void
1689 62ee7d94 2023-01-10 thomas apply_unveil_selfexec(void)
1691 85b37c72 2022-12-30 thomas if (unveil(gotd.argv0, "x") == -1)
1692 85b37c72 2022-12-30 thomas fatal("unveil %s", gotd.argv0);
1694 3efd8e31 2022-10-23 thomas if (unveil(NULL, NULL) == -1)
1695 3efd8e31 2022-10-23 thomas fatal("unveil");
1699 3efd8e31 2022-10-23 thomas main(int argc, char **argv)
1701 3efd8e31 2022-10-23 thomas const struct got_error *error = NULL;
1702 3efd8e31 2022-10-23 thomas int ch, fd = -1, daemonize = 1, verbosity = 0, noaction = 0;
1703 3efd8e31 2022-10-23 thomas const char *confpath = GOTD_CONF_PATH;
1704 3efd8e31 2022-10-23 thomas char *argv0 = argv[0];
1705 3efd8e31 2022-10-23 thomas char title[2048];
1706 3efd8e31 2022-10-23 thomas struct passwd *pw = NULL;
1707 3efd8e31 2022-10-23 thomas char *repo_path = NULL;
1708 3efd8e31 2022-10-23 thomas enum gotd_procid proc_id = PROC_GOTD;
1709 3efd8e31 2022-10-23 thomas struct event evsigint, evsigterm, evsighup, evsigusr1;
1710 3efd8e31 2022-10-23 thomas int *pack_fds = NULL, *temp_fds = NULL;
1712 3efd8e31 2022-10-23 thomas log_init(1, LOG_DAEMON); /* Log to stderr until daemonized. */
1714 62ee7d94 2023-01-10 thomas while ((ch = getopt(argc, argv, "Adf:LnP:RSvW")) != -1) {
1715 3efd8e31 2022-10-23 thomas switch (ch) {
1716 c669c489 2022-12-30 thomas case 'A':
1717 c669c489 2022-12-30 thomas proc_id = PROC_AUTH;
1719 3efd8e31 2022-10-23 thomas case 'd':
1720 3efd8e31 2022-10-23 thomas daemonize = 0;
1722 3efd8e31 2022-10-23 thomas case 'f':
1723 3efd8e31 2022-10-23 thomas confpath = optarg;
1725 2b3d32a1 2022-12-30 thomas case 'L':
1726 2b3d32a1 2022-12-30 thomas proc_id = PROC_LISTEN;
1728 3efd8e31 2022-10-23 thomas case 'n':
1729 3efd8e31 2022-10-23 thomas noaction = 1;
1731 f7065961 2022-10-27 thomas case 'P':
1732 f7065961 2022-10-27 thomas repo_path = realpath(optarg, NULL);
1733 f7065961 2022-10-27 thomas if (repo_path == NULL)
1734 f7065961 2022-10-27 thomas fatal("realpath '%s'", optarg);
1736 3efd8e31 2022-10-23 thomas case 'R':
1737 3efd8e31 2022-10-23 thomas proc_id = PROC_REPO_READ;
1739 62ee7d94 2023-01-10 thomas case 'S':
1740 62ee7d94 2023-01-10 thomas proc_id = PROC_SESSION;
1742 f7065961 2022-10-27 thomas case 'v':
1743 f7065961 2022-10-27 thomas if (verbosity < 3)
1744 f7065961 2022-10-27 thomas verbosity++;
1746 3efd8e31 2022-10-23 thomas case 'W':
1747 3efd8e31 2022-10-23 thomas proc_id = PROC_REPO_WRITE;
1749 3efd8e31 2022-10-23 thomas default:
1750 3efd8e31 2022-10-23 thomas usage();
1754 3efd8e31 2022-10-23 thomas argc -= optind;
1755 3efd8e31 2022-10-23 thomas argv += optind;
1757 3efd8e31 2022-10-23 thomas if (argc != 0)
1758 3efd8e31 2022-10-23 thomas usage();
1760 85b37c72 2022-12-30 thomas if (geteuid() && (proc_id == PROC_GOTD || proc_id == PROC_LISTEN))
1761 3efd8e31 2022-10-23 thomas fatalx("need root privileges");
1763 3efd8e31 2022-10-23 thomas if (parse_config(confpath, proc_id, &gotd) != 0)
1764 3efd8e31 2022-10-23 thomas return 1;
1766 3efd8e31 2022-10-23 thomas pw = getpwnam(gotd.user_name);
1767 3efd8e31 2022-10-23 thomas if (pw == NULL)
1768 3e7c54e1 2022-12-30 thomas fatalx("user %s not found", gotd.user_name);
1770 b4b04e88 2023-01-19 thomas if (pw->pw_uid == 0)
1771 b4b04e88 2023-01-19 thomas fatalx("cannot run %s as the superuser", getprogname());
1773 b4b04e88 2023-01-19 thomas if (noaction) {
1774 b4b04e88 2023-01-19 thomas fprintf(stderr, "configuration OK\n");
1775 3efd8e31 2022-10-23 thomas return 0;
1778 b4b04e88 2023-01-19 thomas gotd.argv0 = argv0;
1779 b4b04e88 2023-01-19 thomas gotd.daemonize = daemonize;
1780 b4b04e88 2023-01-19 thomas gotd.verbosity = verbosity;
1781 b4b04e88 2023-01-19 thomas gotd.confpath = confpath;
1783 b4b04e88 2023-01-19 thomas /* Require an absolute path in argv[0] for reliable re-exec. */
1784 b4b04e88 2023-01-19 thomas if (!got_path_is_absolute(argv0))
1785 b4b04e88 2023-01-19 thomas fatalx("bad path \"%s\": must be an absolute path", argv0);
1787 b4b04e88 2023-01-19 thomas log_init(daemonize ? 0 : 1, LOG_DAEMON);
1788 b4b04e88 2023-01-19 thomas log_setverbose(verbosity);
1790 1eec6e4e 2022-12-06 thomas if (proc_id == PROC_GOTD) {
1791 2b3d32a1 2022-12-30 thomas snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
1792 2b3d32a1 2022-12-30 thomas arc4random_buf(&clients_hash_key, sizeof(clients_hash_key));
1793 2b3d32a1 2022-12-30 thomas if (daemonize && daemon(1, 0) == -1)
1794 2b3d32a1 2022-12-30 thomas fatal("daemon");
1795 1f1613cf 2023-01-23 thomas gotd.pid = getpid();
1796 1f1613cf 2023-01-23 thomas start_listener(argv0, confpath, daemonize, verbosity);
1797 2b3d32a1 2022-12-30 thomas } else if (proc_id == PROC_LISTEN) {
1798 2b3d32a1 2022-12-30 thomas snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
1799 1eec6e4e 2022-12-06 thomas if (verbosity) {
1800 1eec6e4e 2022-12-06 thomas log_info("socket: %s", gotd.unix_socket_path);
1801 1eec6e4e 2022-12-06 thomas log_info("user: %s", pw->pw_name);
1804 3efd8e31 2022-10-23 thomas fd = unix_socket_listen(gotd.unix_socket_path, pw->pw_uid,
1805 f2fc8ce0 2023-01-06 thomas pw->pw_gid);
1806 3efd8e31 2022-10-23 thomas if (fd == -1) {
1807 3efd8e31 2022-10-23 thomas fatal("cannot listen on unix socket %s",
1808 3efd8e31 2022-10-23 thomas gotd.unix_socket_path);
1810 c669c489 2022-12-30 thomas } else if (proc_id == PROC_AUTH) {
1811 c669c489 2022-12-30 thomas snprintf(title, sizeof(title), "%s %s",
1812 c669c489 2022-12-30 thomas gotd_proc_names[proc_id], repo_path);
1813 62ee7d94 2023-01-10 thomas } else if (proc_id == PROC_REPO_READ || proc_id == PROC_REPO_WRITE ||
1814 62ee7d94 2023-01-10 thomas proc_id == PROC_SESSION) {
1815 3efd8e31 2022-10-23 thomas error = got_repo_pack_fds_open(&pack_fds);
1816 3efd8e31 2022-10-23 thomas if (error != NULL)
1817 3efd8e31 2022-10-23 thomas fatalx("cannot open pack tempfiles: %s", error->msg);
1818 3efd8e31 2022-10-23 thomas error = got_repo_temp_fds_open(&temp_fds);
1819 3efd8e31 2022-10-23 thomas if (error != NULL)
1820 3efd8e31 2022-10-23 thomas fatalx("cannot open pack tempfiles: %s", error->msg);
1821 3efd8e31 2022-10-23 thomas if (repo_path == NULL)
1822 3efd8e31 2022-10-23 thomas fatalx("repository path not specified");
1823 3efd8e31 2022-10-23 thomas snprintf(title, sizeof(title), "%s %s",
1824 3efd8e31 2022-10-23 thomas gotd_proc_names[proc_id], repo_path);
1826 3efd8e31 2022-10-23 thomas fatal("invalid process id %d", proc_id);
1828 3efd8e31 2022-10-23 thomas setproctitle("%s", title);
1829 3efd8e31 2022-10-23 thomas log_procinit(title);
1831 3efd8e31 2022-10-23 thomas /* Drop root privileges. */
1832 3efd8e31 2022-10-23 thomas if (setgid(pw->pw_gid) == -1)
1833 3efd8e31 2022-10-23 thomas fatal("setgid %d failed", pw->pw_gid);
1834 3efd8e31 2022-10-23 thomas if (setuid(pw->pw_uid) == -1)
1835 3efd8e31 2022-10-23 thomas fatal("setuid %d failed", pw->pw_uid);
1837 3efd8e31 2022-10-23 thomas event_init();
1839 3efd8e31 2022-10-23 thomas switch (proc_id) {
1840 3efd8e31 2022-10-23 thomas case PROC_GOTD:
1841 3efd8e31 2022-10-23 thomas #ifndef PROFILE
1842 62ee7d94 2023-01-10 thomas /* "exec" promise will be limited to argv[0] via unveil(2). */
1843 62ee7d94 2023-01-10 thomas if (pledge("stdio proc exec sendfd recvfd unveil", NULL) == -1)
1844 3efd8e31 2022-10-23 thomas err(1, "pledge");
1847 2b3d32a1 2022-12-30 thomas case PROC_LISTEN:
1848 2b3d32a1 2022-12-30 thomas #ifndef PROFILE
1849 d4940d40 2023-01-06 thomas if (pledge("stdio sendfd unix unveil", NULL) == -1)
1850 2b3d32a1 2022-12-30 thomas err(1, "pledge");
1853 d4940d40 2023-01-06 thomas * Ensure that AF_UNIX bind(2) cannot be used with any other
1854 d4940d40 2023-01-06 thomas * sockets by revoking all filesystem access via unveil(2).
1856 d4940d40 2023-01-06 thomas apply_unveil_none();
1858 0781db0e 2023-01-06 thomas listen_main(title, fd, gotd.connection_limits,
1859 0781db0e 2023-01-06 thomas gotd.nconnection_limits);
1860 2b3d32a1 2022-12-30 thomas /* NOTREACHED */
1862 c669c489 2022-12-30 thomas case PROC_AUTH:
1863 c669c489 2022-12-30 thomas #ifndef PROFILE
1864 b942ab08 2022-12-30 thomas if (pledge("stdio getpw recvfd unix unveil", NULL) == -1)
1865 c669c489 2022-12-30 thomas err(1, "pledge");
1868 b942ab08 2022-12-30 thomas * We need the "unix" pledge promise for getpeername(2) only.
1869 b942ab08 2022-12-30 thomas * Ensure that AF_UNIX bind(2) cannot be used by revoking all
1870 b942ab08 2022-12-30 thomas * filesystem access via unveil(2). Access to password database
1871 b942ab08 2022-12-30 thomas * files will still work since "getpw" bypasses unveil(2).
1873 b942ab08 2022-12-30 thomas apply_unveil_none();
1875 c669c489 2022-12-30 thomas auth_main(title, &gotd.repos, repo_path);
1876 c669c489 2022-12-30 thomas /* NOTREACHED */
1878 62ee7d94 2023-01-10 thomas case PROC_SESSION:
1879 62ee7d94 2023-01-10 thomas #ifndef PROFILE
1881 62ee7d94 2023-01-10 thomas * The "recvfd" promise is only needed during setup and
1882 62ee7d94 2023-01-10 thomas * will be removed in a later pledge(2) call.
1884 62ee7d94 2023-01-10 thomas if (pledge("stdio rpath wpath cpath recvfd sendfd fattr flock "
1885 62ee7d94 2023-01-10 thomas "unveil", NULL) == -1)
1886 62ee7d94 2023-01-10 thomas err(1, "pledge");
1888 62ee7d94 2023-01-10 thomas apply_unveil_repo_readwrite(repo_path);
1889 62ee7d94 2023-01-10 thomas session_main(title, repo_path, pack_fds, temp_fds,
1890 62ee7d94 2023-01-10 thomas &gotd.request_timeout);
1891 62ee7d94 2023-01-10 thomas /* NOTREACHED */
1893 3efd8e31 2022-10-23 thomas case PROC_REPO_READ:
1894 3efd8e31 2022-10-23 thomas #ifndef PROFILE
1895 414e37cb 2022-12-30 thomas if (pledge("stdio rpath recvfd unveil", NULL) == -1)
1896 3efd8e31 2022-10-23 thomas err(1, "pledge");
1898 414e37cb 2022-12-30 thomas apply_unveil_repo_readonly(repo_path);
1899 414e37cb 2022-12-30 thomas repo_read_main(title, repo_path, pack_fds, temp_fds);
1900 3efd8e31 2022-10-23 thomas /* NOTREACHED */
1901 3efd8e31 2022-10-23 thomas exit(0);
1902 3efd8e31 2022-10-23 thomas case PROC_REPO_WRITE:
1903 3efd8e31 2022-10-23 thomas #ifndef PROFILE
1904 414e37cb 2022-12-30 thomas if (pledge("stdio rpath recvfd unveil", NULL) == -1)
1905 3efd8e31 2022-10-23 thomas err(1, "pledge");
1907 414e37cb 2022-12-30 thomas apply_unveil_repo_readonly(repo_path);
1908 414e37cb 2022-12-30 thomas repo_write_main(title, repo_path, pack_fds, temp_fds);
1909 3efd8e31 2022-10-23 thomas /* NOTREACHED */
1910 3efd8e31 2022-10-23 thomas exit(0);
1911 3efd8e31 2022-10-23 thomas default:
1912 3efd8e31 2022-10-23 thomas fatal("invalid process id %d", proc_id);
1915 3efd8e31 2022-10-23 thomas if (proc_id != PROC_GOTD)
1916 3efd8e31 2022-10-23 thomas fatal("invalid process id %d", proc_id);
1918 62ee7d94 2023-01-10 thomas apply_unveil_selfexec();
1920 3efd8e31 2022-10-23 thomas signal_set(&evsigint, SIGINT, gotd_sighdlr, NULL);
1921 3efd8e31 2022-10-23 thomas signal_set(&evsigterm, SIGTERM, gotd_sighdlr, NULL);
1922 3efd8e31 2022-10-23 thomas signal_set(&evsighup, SIGHUP, gotd_sighdlr, NULL);
1923 3efd8e31 2022-10-23 thomas signal_set(&evsigusr1, SIGUSR1, gotd_sighdlr, NULL);
1924 3efd8e31 2022-10-23 thomas signal(SIGPIPE, SIG_IGN);
1926 3efd8e31 2022-10-23 thomas signal_add(&evsigint, NULL);
1927 3efd8e31 2022-10-23 thomas signal_add(&evsigterm, NULL);
1928 3efd8e31 2022-10-23 thomas signal_add(&evsighup, NULL);
1929 3efd8e31 2022-10-23 thomas signal_add(&evsigusr1, NULL);
1931 85b37c72 2022-12-30 thomas gotd_imsg_event_add(&gotd.listen_proc.iev);
1933 3efd8e31 2022-10-23 thomas event_dispatch();
1935 3efd8e31 2022-10-23 thomas free(repo_path);
1936 62ee7d94 2023-01-10 thomas gotd_shutdown();
1938 3efd8e31 2022-10-23 thomas return 0;
