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Date:: Mon Apr 15 16:39:30 2024 UTC
Message:: got-notify-http: add the repository name in the json ok stsp
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1 /*
2  * Copyright (c) 2024 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/types.h>
18 #include <sys/queue.h>
19 #include <sys/tree.h>
20 #include <sys/socket.h>
21 #include <sys/wait.h>
22 
23 #include <errno.h>
24 #include <event.h>
25 #include <siphash.h>
26 #include <limits.h>
27 #include <sha1.h>
28 #include <sha2.h>
29 #include <signal.h>
30 #include <stdio.h>
31 #include <stdlib.h>
32 #include <string.h>
33 #include <imsg.h>
34 #include <unistd.h>
35 
36 #include "got_error.h"
37 #include "got_path.h"
38 
39 #include "gotd.h"
40 #include "log.h"
41 #include "notify.h"
42 
43 #ifndef nitems
44 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
45 #endif
46 
47 static struct gotd_notify {
48 	pid_t pid;
49 	const char *title;
50 	struct gotd_imsgev parent_iev;
51 	struct gotd_repolist *repos;
52 	const char *default_sender;
53 } gotd_notify;
54 
55 struct gotd_notify_session {
56 	STAILQ_ENTRY(gotd_notify_session) entry;
57 	uint32_t id;
58 	struct gotd_imsgev iev;
59 };
60 STAILQ_HEAD(gotd_notify_sessions, gotd_notify_session);
61 
62 static struct gotd_notify_sessions gotd_notify_sessions[GOTD_CLIENT_TABLE_SIZE];
63 static SIPHASH_KEY sessions_hash_key;
64 
65 static void gotd_notify_shutdown(void);
66 
67 static uint64_t
68 session_hash(uint32_t session_id)
69 {
70 	return SipHash24(&sessions_hash_key, &session_id, sizeof(session_id));
71 }
72 
73 static void
74 add_session(struct gotd_notify_session *session)
75 {
76 	uint64_t slot;
77 
78 	slot = session_hash(session->id) % nitems(gotd_notify_sessions);
79 	STAILQ_INSERT_HEAD(&gotd_notify_sessions[slot], session, entry);
80 }
81 
82 static struct gotd_notify_session *
83 find_session(uint32_t session_id)
84 {
85 	uint64_t slot;
86 	struct gotd_notify_session *s;
87 
88 	slot = session_hash(session_id) % nitems(gotd_notify_sessions);
89 	STAILQ_FOREACH(s, &gotd_notify_sessions[slot], entry) {
90 		if (s->id == session_id)
91 			return s;
92 	}
93 
94 	return NULL;
95 }
96 
97 static struct gotd_notify_session *
98 find_session_by_fd(int fd)
99 {
100 	uint64_t slot;
101 	struct gotd_notify_session *s;
102 
103 	for (slot = 0; slot < nitems(gotd_notify_sessions); slot++) {
104 		STAILQ_FOREACH(s, &gotd_notify_sessions[slot], entry) {
105 			if (s->iev.ibuf.fd == fd)
106 				return s;
107 		}
108 	}
109 
110 	return NULL;
111 }
112 
113 static void
114 remove_session(struct gotd_notify_session *session)
115 {
116 	uint64_t slot;
117 
118 	slot = session_hash(session->id) % nitems(gotd_notify_sessions);
119 	STAILQ_REMOVE(&gotd_notify_sessions[slot], session,
120 	    gotd_notify_session, entry);
121 	free(session);
122 }
123 
124 static uint32_t
125 get_session_id(void)
126 {
127 	int duplicate = 0;
128 	uint32_t id;
129 
130 	do {
131 		id = arc4random();
132 		duplicate = (find_session(id) != NULL);
133 	} while (duplicate || id == 0);
134 
135 	return id;
136 }
137 
138 static void
139 gotd_notify_sighdlr(int sig, short event, void *arg)
140 {
141 	/*
142 	 * Normal signal handler rules don't apply because libevent
143 	 * decouples for us.
144 	 */
145 
146 	switch (sig) {
147 	case SIGHUP:
148 		log_info("%s: ignoring SIGHUP", __func__);
149 		break;
150 	case SIGUSR1:
151 		log_info("%s: ignoring SIGUSR1", __func__);
152 		break;
153 	case SIGTERM:
154 	case SIGINT:
155 		gotd_notify_shutdown();
156 		/* NOTREACHED */
157 		break;
158 	default:
159 		fatalx("unexpected signal");
160 	}
161 }
162 
163 static void
164 run_notification_helper(const char *prog, const char **argv, int fd)
165 {
166 	const struct got_error *err = NULL;
167 	pid_t pid;
168 	int child_status;
169 
170 	pid = fork();
171 	if (pid == -1) {
172 		err = got_error_from_errno("fork");
173 		log_warn("%s", err->msg);
174 		return;
175 	} else if (pid == 0) {
176 		signal(SIGQUIT, SIG_DFL);
177 		signal(SIGINT, SIG_DFL);
178 		signal(SIGCHLD, SIG_DFL);
179 
180 		if (dup2(fd, STDIN_FILENO) == -1) {
181 			fprintf(stderr, "%s: dup2: %s\n", getprogname(),
182 			    strerror(errno));
183 			_exit(1);
184 		}
185 
186 		closefrom(STDERR_FILENO + 1);
187 
188 		if (execv(prog, (char *const *)argv) == -1) {
189 			fprintf(stderr, "%s: exec %s: %s\n", getprogname(),
190 			    prog, strerror(errno));
191 			_exit(1);
192 		}
193 
194 		/* not reached */
195 	}
196 
197 	if (waitpid(pid, &child_status, 0) == -1) {
198 		err = got_error_from_errno("waitpid");
199 		goto done;
200 	}
201 
202 	if (!WIFEXITED(child_status)) {
203 		err = got_error(GOT_ERR_PRIVSEP_DIED);
204 		goto done;
205 	}
206 
207 	if (WEXITSTATUS(child_status) != 0)
208 		err = got_error(GOT_ERR_PRIVSEP_EXIT);
209 done:
210 	if (err)
211 		log_warnx("%s: child %s pid %d: %s", gotd_notify.title,
212 		    prog, pid, err->msg);
213 }
214 
215 static void
216 notify_email(struct gotd_notification_target *target, const char *subject_line,
217     int fd)
218 {
219 	const char *argv[13];
220 	int i = 0;
221 
222 	argv[i++] = GOTD_PATH_PROG_NOTIFY_EMAIL;
223 
224 	argv[i++] = "-f";
225 	if (target->conf.email.sender)
226 		argv[i++] = target->conf.email.sender;
227 	else
228 		argv[i++] = gotd_notify.default_sender;
229 
230 	if (target->conf.email.responder) {
231 		argv[i++] = "-r";
232 		argv[i++] = target->conf.email.responder;
233 	}
234 
235 	if (target->conf.email.hostname) {
236 		argv[i++] = "-h";
237 		argv[i++] = target->conf.email.hostname;
238 	}
239 	
240 	if (target->conf.email.port) {
241 		argv[i++] = "-p";
242 		argv[i++] = target->conf.email.port;
243 	}
244 
245 	argv[i++] = "-s";
246 	argv[i++] = subject_line;
247 
248 	argv[i++] = target->conf.email.recipient;
249 
250 	argv[i] = NULL;
251 
252 	run_notification_helper(GOTD_PATH_PROG_NOTIFY_EMAIL, argv, fd);
253 }
254 
255 static void
256 notify_http(struct gotd_notification_target *target, const char *repo, int fd)
257 {
258 	const char *argv[10];
259 	int argc = 0;
260 
261 	argv[argc++] = GOTD_PATH_PROG_NOTIFY_HTTP;
262 	if (target->conf.http.tls)
263 		argv[argc++] = "-c";
264 
265 	argv[argc++] = "-r";
266 	argv[argc++] = repo;
267 	argv[argc++] = "-h";
268 	argv[argc++] = target->conf.http.hostname;
269 	argv[argc++] = "-p";
270 	argv[argc++] = target->conf.http.port;
271 
272 	argv[argc++] = target->conf.http.path;
273 
274 	argv[argc] = NULL;
275 
276 	run_notification_helper(GOTD_PATH_PROG_NOTIFY_HTTP, argv, fd);
277 }
278 
279 static const struct got_error *
280 send_notification(struct imsg *imsg, struct gotd_imsgev *iev)
281 {
282 	const struct got_error *err = NULL;
283 	struct gotd_imsg_notify inotify;
284 	size_t datalen;
285 	struct gotd_repo *repo;
286 	struct gotd_notification_target *target;
287 	int fd;
288 
289 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
290 	if (datalen != sizeof(inotify))
291 		return got_error(GOT_ERR_PRIVSEP_LEN);
292 
293 	memcpy(&inotify, imsg->data, datalen);
294 
295 	repo = gotd_find_repo_by_name(inotify.repo_name, gotd_notify.repos);
296 	if (repo == NULL)
297 		return got_error(GOT_ERR_PRIVSEP_MSG);
298 
299 	fd = imsg_get_fd(imsg);
300 	if (fd == -1)
301 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
302 
303 	if (lseek(fd, 0, SEEK_SET) == -1) {
304 		err = got_error_from_errno("lseek");
305 		goto done;
306 	}
307 
308 	STAILQ_FOREACH(target, &repo->notification_targets, entry) {
309 		switch (target->type) {
310 		case GOTD_NOTIFICATION_VIA_EMAIL:
311 			notify_email(target, inotify.subject_line, fd);
312 			break;
313 		case GOTD_NOTIFICATION_VIA_HTTP:
314 			notify_http(target, repo->name, fd);
315 			break;
316 		}
317 	}
318 
319 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_NOTIFICATION_SENT,
320 	    PROC_NOTIFY, -1, NULL, 0) == -1) {
321 		err = got_error_from_errno("imsg compose NOTIFY");
322 		goto done;
323 	}
324 done:
325 	close(fd);
326 	return err;
327 }
328 
329 static void
330 notify_dispatch_session(int fd, short event, void *arg)
331 {
332 	struct gotd_imsgev *iev = arg;
333 	struct imsgbuf *ibuf = &iev->ibuf;
334 	ssize_t n;
335 	int shut = 0;
336 	struct imsg imsg;
337 
338 	if (event & EV_READ) {
339 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
340 			fatal("imsg_read error");
341 		if (n == 0) {
342 			/* Connection closed. */
343 			shut = 1;
344 			goto done;
345 		}
346 	}
347 
348 	if (event & EV_WRITE) {
349 		n = msgbuf_write(&ibuf->w);
350 		if (n == -1 && errno != EAGAIN)
351 			fatal("msgbuf_write");
352 		if (n == 0) {
353 			/* Connection closed. */
354 			shut = 1;
355 			goto done;
356 		}
357 	}
358 
359 	for (;;) {
360 		const struct got_error *err = NULL;
361 
362 		if ((n = imsg_get(ibuf, &imsg)) == -1)
363 			fatal("%s: imsg_get error", __func__);
364 		if (n == 0)	/* No more messages. */
365 			break;
366 
367 		switch (imsg.hdr.type) {
368 		case GOTD_IMSG_NOTIFY:
369 			err = send_notification(&imsg, iev);
370 			break;
371 		default:
372 			log_debug("unexpected imsg %d", imsg.hdr.type);
373 			break;
374 		}
375 		imsg_free(&imsg);
376 
377 		if (err)
378 			log_warnx("%s: %s", __func__, err->msg);
379 	}
380 done:
381 	if (!shut) {
382 		gotd_imsg_event_add(iev);
383 	} else {
384 		struct gotd_notify_session *session;
385 
386 		/* This pipe is dead. Remove its event handler */
387 		event_del(&iev->ev);
388 		imsg_clear(&iev->ibuf);
389 
390 		session = find_session_by_fd(fd);
391 		if (session)
392 			remove_session(session);
393 	}
394 }
395 
396 static const struct got_error *
397 recv_session(struct imsg *imsg)
398 {
399 	struct gotd_notify_session *session;
400 	size_t datalen;
401 	int fd;
402 
403 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
404 	if (datalen != 0)
405 		return got_error(GOT_ERR_PRIVSEP_LEN);
406 
407 	fd = imsg_get_fd(imsg);
408 	if (fd == -1)
409 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
410 
411 	session = calloc(1, sizeof(*session));
412 	if (session == NULL)
413 		return got_error_from_errno("calloc");
414 
415 	session->id = get_session_id();
416 	imsg_init(&session->iev.ibuf, fd);
417 	session->iev.handler = notify_dispatch_session;
418 	session->iev.events = EV_READ;
419 	session->iev.handler_arg = NULL;
420 	event_set(&session->iev.ev, session->iev.ibuf.fd, EV_READ,
421 	    notify_dispatch_session, &session->iev);
422 	gotd_imsg_event_add(&session->iev);
423 	add_session(session);
424 
425 	return NULL;
426 }
427 
428 static void
429 notify_dispatch(int fd, short event, void *arg)
430 {
431 	struct gotd_imsgev *iev = arg;
432 	struct imsgbuf *ibuf = &iev->ibuf;
433 	ssize_t n;
434 	int shut = 0;
435 	struct imsg imsg;
436 
437 	if (event & EV_READ) {
438 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
439 			fatal("imsg_read error");
440 		if (n == 0) {
441 			/* Connection closed. */
442 			shut = 1;
443 			goto done;
444 		}
445 	}
446 
447 	if (event & EV_WRITE) {
448 		n = msgbuf_write(&ibuf->w);
449 		if (n == -1 && errno != EAGAIN)
450 			fatal("msgbuf_write");
451 		if (n == 0) {
452 			/* Connection closed. */
453 			shut = 1;
454 			goto done;
455 		}
456 	}
457 
458 	for (;;) {
459 		const struct got_error *err = NULL;
460 
461 		if ((n = imsg_get(ibuf, &imsg)) == -1)
462 			fatal("%s: imsg_get error", __func__);
463 		if (n == 0)	/* No more messages. */
464 			break;
465 
466 		switch (imsg.hdr.type) {
467 		case GOTD_IMSG_CONNECT_SESSION:
468 			err = recv_session(&imsg);
469 			break;
470 		default:
471 			log_debug("unexpected imsg %d", imsg.hdr.type);
472 			break;
473 		}
474 		imsg_free(&imsg);
475 
476 		if (err)
477 			log_warnx("%s: %s", __func__, err->msg);
478 	}
479 done:
480 	if (!shut) {
481 		gotd_imsg_event_add(iev);
482 	} else {
483 		/* This pipe is dead. Remove its event handler */
484 		event_del(&iev->ev);
485 		event_loopexit(NULL);
486 	}
487 
488 }
489 
490 void
491 notify_main(const char *title, struct gotd_repolist *repos,
492     const char *default_sender)
493 {
494 	const struct got_error *err = NULL;
495 	struct event evsigint, evsigterm, evsighup, evsigusr1;
496 
497 	arc4random_buf(&sessions_hash_key, sizeof(sessions_hash_key));
498 
499 	gotd_notify.title = title;
500 	gotd_notify.repos = repos;
501 	gotd_notify.default_sender = default_sender;
502 	gotd_notify.pid = getpid();
503 
504 	signal_set(&evsigint, SIGINT, gotd_notify_sighdlr, NULL);
505 	signal_set(&evsigterm, SIGTERM, gotd_notify_sighdlr, NULL);
506 	signal_set(&evsighup, SIGHUP, gotd_notify_sighdlr, NULL);
507 	signal_set(&evsigusr1, SIGUSR1, gotd_notify_sighdlr, NULL);
508 	signal(SIGPIPE, SIG_IGN);
509 
510 	signal_add(&evsigint, NULL);
511 	signal_add(&evsigterm, NULL);
512 	signal_add(&evsighup, NULL);
513 	signal_add(&evsigusr1, NULL);
514 
515 	imsg_init(&gotd_notify.parent_iev.ibuf, GOTD_FILENO_MSG_PIPE);
516 	gotd_notify.parent_iev.handler = notify_dispatch;
517 	gotd_notify.parent_iev.events = EV_READ;
518 	gotd_notify.parent_iev.handler_arg = NULL;
519 	event_set(&gotd_notify.parent_iev.ev, gotd_notify.parent_iev.ibuf.fd,
520 	    EV_READ, notify_dispatch, &gotd_notify.parent_iev);
521 	gotd_imsg_event_add(&gotd_notify.parent_iev);
522 
523 	event_dispatch();
524 
525 	if (err)
526 		log_warnx("%s: %s", title, err->msg);
527 	gotd_notify_shutdown();
528 }
529 
530 void
531 gotd_notify_shutdown(void)
532 {
533 	log_debug("%s: shutting down", gotd_notify.title);
534 	exit(0);
535 }