1 b0a6bcf7 2022-09-13 op /* $OpenBSD: proc.c,v 1.41 2021/12/04 06:52:58 florian Exp $ */
4 b0a6bcf7 2022-09-13 op * Copyright (c) 2010 - 2016 Reyk Floeter <reyk@openbsd.org>
5 b0a6bcf7 2022-09-13 op * Copyright (c) 2008 Pierre-Yves Ritschard <pyr@openbsd.org>
7 b0a6bcf7 2022-09-13 op * Permission to use, copy, modify, and distribute this software for any
8 b0a6bcf7 2022-09-13 op * purpose with or without fee is hereby granted, provided that the above
9 b0a6bcf7 2022-09-13 op * copyright notice and this permission notice appear in all copies.
11 b0a6bcf7 2022-09-13 op * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 b0a6bcf7 2022-09-13 op * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 b0a6bcf7 2022-09-13 op * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 b0a6bcf7 2022-09-13 op * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 b0a6bcf7 2022-09-13 op * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 b0a6bcf7 2022-09-13 op * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 b0a6bcf7 2022-09-13 op * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 b0a6bcf7 2022-09-13 op #include <sys/types.h>
21 b0a6bcf7 2022-09-13 op #include <sys/queue.h>
22 b0a6bcf7 2022-09-13 op #include <sys/tree.h>
23 b0a6bcf7 2022-09-13 op #include <sys/socket.h>
24 b0a6bcf7 2022-09-13 op #include <sys/wait.h>
26 b0a6bcf7 2022-09-13 op #include <fcntl.h>
27 b0a6bcf7 2022-09-13 op #include <limits.h>
28 b0a6bcf7 2022-09-13 op #include <stdio.h>
29 b0a6bcf7 2022-09-13 op #include <stdlib.h>
30 b0a6bcf7 2022-09-13 op #include <unistd.h>
31 b0a6bcf7 2022-09-13 op #include <string.h>
32 b0a6bcf7 2022-09-13 op #include <errno.h>
33 b0a6bcf7 2022-09-13 op #include <signal.h>
34 b0a6bcf7 2022-09-13 op #include <paths.h>
35 b0a6bcf7 2022-09-13 op #include <pwd.h>
36 b0a6bcf7 2022-09-13 op #include <event.h>
37 b0a6bcf7 2022-09-13 op #include <imsg.h>
39 b0a6bcf7 2022-09-13 op #include "log.h"
40 b0a6bcf7 2022-09-13 op #include "proc.h"
42 b0a6bcf7 2022-09-13 op #include "galileo.h"
44 b0a6bcf7 2022-09-13 op void proc_exec(struct privsep *, struct privsep_proc *, unsigned int, int,
45 b0a6bcf7 2022-09-13 op int, char **);
46 b0a6bcf7 2022-09-13 op void proc_setup(struct privsep *, struct privsep_proc *, unsigned int);
47 b0a6bcf7 2022-09-13 op void proc_open(struct privsep *, int, int);
48 b0a6bcf7 2022-09-13 op void proc_accept(struct privsep *, int, enum privsep_procid,
49 b0a6bcf7 2022-09-13 op unsigned int);
50 b0a6bcf7 2022-09-13 op void proc_close(struct privsep *);
51 b0a6bcf7 2022-09-13 op int proc_ispeer(struct privsep_proc *, unsigned int, enum privsep_procid);
52 b0a6bcf7 2022-09-13 op void proc_shutdown(struct privsep_proc *);
53 b0a6bcf7 2022-09-13 op void proc_sig_handler(int, short, void *);
54 b0a6bcf7 2022-09-13 op void proc_range(struct privsep *, enum privsep_procid, int *, int *);
55 b0a6bcf7 2022-09-13 op int proc_dispatch_null(int, struct privsep_proc *, struct imsg *);
58 b0a6bcf7 2022-09-13 op proc_ispeer(struct privsep_proc *procs, unsigned int nproc,
59 b0a6bcf7 2022-09-13 op enum privsep_procid type)
61 b0a6bcf7 2022-09-13 op unsigned int i;
63 b0a6bcf7 2022-09-13 op for (i = 0; i < nproc; i++)
64 b0a6bcf7 2022-09-13 op if (procs[i].p_id == type)
69 b0a6bcf7 2022-09-13 op enum privsep_procid
70 b0a6bcf7 2022-09-13 op proc_getid(struct privsep_proc *procs, unsigned int nproc,
71 b0a6bcf7 2022-09-13 op const char *proc_name)
73 b0a6bcf7 2022-09-13 op struct privsep_proc *p;
74 b0a6bcf7 2022-09-13 op unsigned int proc;
76 b0a6bcf7 2022-09-13 op for (proc = 0; proc < nproc; proc++) {
77 b0a6bcf7 2022-09-13 op p = &procs[proc];
78 b0a6bcf7 2022-09-13 op if (strcmp(p->p_title, proc_name))
81 b0a6bcf7 2022-09-13 op return (p->p_id);
84 b0a6bcf7 2022-09-13 op return (PROC_MAX);
88 b0a6bcf7 2022-09-13 op proc_exec(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc,
89 b0a6bcf7 2022-09-13 op int debug, int argc, char **argv)
91 b0a6bcf7 2022-09-13 op unsigned int proc, nargc, i, proc_i;
93 b0a6bcf7 2022-09-13 op struct privsep_proc *p;
97 b0a6bcf7 2022-09-13 op /* Prepare the new process argv. */
98 b0a6bcf7 2022-09-13 op nargv = calloc(argc + 5, sizeof(char *));
99 b0a6bcf7 2022-09-13 op if (nargv == NULL)
100 b0a6bcf7 2022-09-13 op fatal("%s: calloc", __func__);
102 b0a6bcf7 2022-09-13 op /* Copy call argument first. */
104 b0a6bcf7 2022-09-13 op nargv[nargc++] = argv[0];
106 b0a6bcf7 2022-09-13 op /* Set process name argument and save the position. */
107 b0a6bcf7 2022-09-13 op nargv[nargc++] = "-P";
108 b0a6bcf7 2022-09-13 op proc_i = nargc;
111 b0a6bcf7 2022-09-13 op /* Point process instance arg to stack and copy the original args. */
112 b0a6bcf7 2022-09-13 op nargv[nargc++] = "-I";
113 b0a6bcf7 2022-09-13 op nargv[nargc++] = num;
114 b0a6bcf7 2022-09-13 op for (i = 1; i < (unsigned int) argc; i++)
115 b0a6bcf7 2022-09-13 op nargv[nargc++] = argv[i];
117 b0a6bcf7 2022-09-13 op nargv[nargc] = NULL;
119 b0a6bcf7 2022-09-13 op for (proc = 0; proc < nproc; proc++) {
120 b0a6bcf7 2022-09-13 op p = &procs[proc];
122 b0a6bcf7 2022-09-13 op /* Update args with process title. */
123 b0a6bcf7 2022-09-13 op nargv[proc_i] = (char *)(uintptr_t)p->p_title;
125 b0a6bcf7 2022-09-13 op /* Fire children processes. */
126 b0a6bcf7 2022-09-13 op for (i = 0; i < ps->ps_instances[p->p_id]; i++) {
127 b0a6bcf7 2022-09-13 op /* Update the process instance number. */
128 b0a6bcf7 2022-09-13 op snprintf(num, sizeof(num), "%u", i);
130 b0a6bcf7 2022-09-13 op fd = ps->ps_pipes[p->p_id][i].pp_pipes[PROC_PARENT][0];
131 b0a6bcf7 2022-09-13 op ps->ps_pipes[p->p_id][i].pp_pipes[PROC_PARENT][0] = -1;
133 b0a6bcf7 2022-09-13 op switch (fork()) {
135 b0a6bcf7 2022-09-13 op fatal("%s: fork", __func__);
138 b0a6bcf7 2022-09-13 op /* First create a new session */
139 b0a6bcf7 2022-09-13 op if (setsid() == -1)
140 b0a6bcf7 2022-09-13 op fatal("setsid");
142 b0a6bcf7 2022-09-13 op /* Prepare parent socket. */
143 b0a6bcf7 2022-09-13 op if (fd != PROC_PARENT_SOCK_FILENO) {
144 b0a6bcf7 2022-09-13 op if (dup2(fd, PROC_PARENT_SOCK_FILENO)
146 b0a6bcf7 2022-09-13 op fatal("dup2");
147 b0a6bcf7 2022-09-13 op } else if (fcntl(fd, F_SETFD, 0) == -1)
148 b0a6bcf7 2022-09-13 op fatal("fcntl");
150 b0a6bcf7 2022-09-13 op /* Daemons detach from terminal. */
151 b0a6bcf7 2022-09-13 op if (!debug && (fd =
152 b0a6bcf7 2022-09-13 op open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
153 b0a6bcf7 2022-09-13 op (void)dup2(fd, STDIN_FILENO);
154 b0a6bcf7 2022-09-13 op (void)dup2(fd, STDOUT_FILENO);
155 b0a6bcf7 2022-09-13 op (void)dup2(fd, STDERR_FILENO);
157 b0a6bcf7 2022-09-13 op (void)close(fd);
160 b0a6bcf7 2022-09-13 op execvp(argv[0], nargv);
161 b0a6bcf7 2022-09-13 op fatal("%s: execvp", __func__);
164 b0a6bcf7 2022-09-13 op /* Close child end. */
174 b0a6bcf7 2022-09-13 op proc_connect(struct privsep *ps)
176 b0a6bcf7 2022-09-13 op struct imsgev *iev;
177 b0a6bcf7 2022-09-13 op unsigned int src, dst, inst;
179 b0a6bcf7 2022-09-13 op /* Don't distribute any sockets if we are not really going to run. */
180 b0a6bcf7 2022-09-13 op if (ps->ps_noaction)
183 b0a6bcf7 2022-09-13 op for (dst = 0; dst < PROC_MAX; dst++) {
184 b0a6bcf7 2022-09-13 op /* We don't communicate with ourselves. */
185 b0a6bcf7 2022-09-13 op if (dst == PROC_PARENT)
188 b0a6bcf7 2022-09-13 op for (inst = 0; inst < ps->ps_instances[dst]; inst++) {
189 b0a6bcf7 2022-09-13 op iev = &ps->ps_ievs[dst][inst];
190 b0a6bcf7 2022-09-13 op imsg_init(&iev->ibuf, ps->ps_pp->pp_pipes[dst][inst]);
191 b0a6bcf7 2022-09-13 op event_set(&iev->ev, iev->ibuf.fd, iev->events,
192 b0a6bcf7 2022-09-13 op iev->handler, iev->data);
193 b0a6bcf7 2022-09-13 op event_add(&iev->ev, NULL);
197 b0a6bcf7 2022-09-13 op /* Distribute the socketpair()s for everyone. */
198 b0a6bcf7 2022-09-13 op for (src = 0; src < PROC_MAX; src++)
199 b0a6bcf7 2022-09-13 op for (dst = src; dst < PROC_MAX; dst++) {
200 b0a6bcf7 2022-09-13 op /* Parent already distributed its fds. */
201 b0a6bcf7 2022-09-13 op if (src == PROC_PARENT || dst == PROC_PARENT)
204 b0a6bcf7 2022-09-13 op proc_open(ps, src, dst);
209 b0a6bcf7 2022-09-13 op proc_init(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc,
210 b0a6bcf7 2022-09-13 op int debug, int argc, char **argv, enum privsep_procid proc_id)
212 b0a6bcf7 2022-09-13 op struct privsep_proc *p = NULL;
213 b0a6bcf7 2022-09-13 op struct privsep_pipes *pa, *pb;
214 b0a6bcf7 2022-09-13 op unsigned int proc;
215 b0a6bcf7 2022-09-13 op unsigned int dst;
218 b0a6bcf7 2022-09-13 op /* Don't initiate anything if we are not really going to run. */
219 b0a6bcf7 2022-09-13 op if (ps->ps_noaction)
222 b0a6bcf7 2022-09-13 op if (proc_id == PROC_PARENT) {
223 b0a6bcf7 2022-09-13 op privsep_process = PROC_PARENT;
224 b0a6bcf7 2022-09-13 op proc_setup(ps, procs, nproc);
227 b0a6bcf7 2022-09-13 op * Create the children sockets so we can use them
228 b0a6bcf7 2022-09-13 op * to distribute the rest of the socketpair()s using
229 b0a6bcf7 2022-09-13 op * proc_connect() later.
231 b0a6bcf7 2022-09-13 op for (dst = 0; dst < PROC_MAX; dst++) {
232 b0a6bcf7 2022-09-13 op /* Don't create socket for ourselves. */
233 b0a6bcf7 2022-09-13 op if (dst == PROC_PARENT)
236 b0a6bcf7 2022-09-13 op for (proc = 0; proc < ps->ps_instances[dst]; proc++) {
237 b0a6bcf7 2022-09-13 op pa = &ps->ps_pipes[PROC_PARENT][0];
238 b0a6bcf7 2022-09-13 op pb = &ps->ps_pipes[dst][proc];
239 b0a6bcf7 2022-09-13 op if (socketpair(AF_UNIX,
240 b0a6bcf7 2022-09-13 op SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC,
241 b0a6bcf7 2022-09-13 op PF_UNSPEC, fds) == -1)
242 b0a6bcf7 2022-09-13 op fatal("%s: socketpair", __func__);
244 b0a6bcf7 2022-09-13 op pa->pp_pipes[dst][proc] = fds[0];
245 b0a6bcf7 2022-09-13 op pb->pp_pipes[PROC_PARENT][0] = fds[1];
249 b0a6bcf7 2022-09-13 op /* Engage! */
250 b0a6bcf7 2022-09-13 op proc_exec(ps, procs, nproc, debug, argc, argv);
254 b0a6bcf7 2022-09-13 op /* Initialize a child */
255 b0a6bcf7 2022-09-13 op for (proc = 0; proc < nproc; proc++) {
256 b0a6bcf7 2022-09-13 op if (procs[proc].p_id != proc_id)
258 b0a6bcf7 2022-09-13 op p = &procs[proc];
261 b0a6bcf7 2022-09-13 op if (p == NULL || p->p_init == NULL)
262 b0a6bcf7 2022-09-13 op fatalx("%s: process %d missing process initialization",
263 b0a6bcf7 2022-09-13 op __func__, proc_id);
265 b0a6bcf7 2022-09-13 op p->p_init(ps, p);
267 b0a6bcf7 2022-09-13 op fatalx("failed to initiate child process");
271 b0a6bcf7 2022-09-13 op proc_accept(struct privsep *ps, int fd, enum privsep_procid dst,
272 b0a6bcf7 2022-09-13 op unsigned int n)
274 b0a6bcf7 2022-09-13 op struct privsep_pipes *pp = ps->ps_pp;
275 b0a6bcf7 2022-09-13 op struct imsgev *iev;
277 b0a6bcf7 2022-09-13 op if (ps->ps_ievs[dst] == NULL) {
278 b0a6bcf7 2022-09-13 op #if DEBUG > 1
279 b0a6bcf7 2022-09-13 op log_debug("%s: %s src %d %d to dst %d %d not connected",
280 b0a6bcf7 2022-09-13 op __func__, ps->ps_title[privsep_process],
281 b0a6bcf7 2022-09-13 op privsep_process, ps->ps_instance + 1,
288 b0a6bcf7 2022-09-13 op if (pp->pp_pipes[dst][n] != -1) {
289 b0a6bcf7 2022-09-13 op log_warnx("%s: duplicated descriptor", __func__);
293 b0a6bcf7 2022-09-13 op pp->pp_pipes[dst][n] = fd;
295 b0a6bcf7 2022-09-13 op iev = &ps->ps_ievs[dst][n];
296 b0a6bcf7 2022-09-13 op imsg_init(&iev->ibuf, fd);
297 b0a6bcf7 2022-09-13 op event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data);
298 b0a6bcf7 2022-09-13 op event_add(&iev->ev, NULL);
302 b0a6bcf7 2022-09-13 op proc_setup(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc)
304 b0a6bcf7 2022-09-13 op unsigned int i, j, src, dst, id;
305 b0a6bcf7 2022-09-13 op struct privsep_pipes *pp;
307 b0a6bcf7 2022-09-13 op /* Initialize parent title, ps_instances and procs. */
308 b0a6bcf7 2022-09-13 op ps->ps_title[PROC_PARENT] = "parent";
310 b0a6bcf7 2022-09-13 op for (src = 0; src < PROC_MAX; src++)
311 b0a6bcf7 2022-09-13 op /* Default to 1 process instance */
312 b0a6bcf7 2022-09-13 op if (ps->ps_instances[src] < 1)
313 b0a6bcf7 2022-09-13 op ps->ps_instances[src] = 1;
315 b0a6bcf7 2022-09-13 op for (src = 0; src < nproc; src++) {
316 b0a6bcf7 2022-09-13 op procs[src].p_ps = ps;
317 b0a6bcf7 2022-09-13 op if (procs[src].p_cb == NULL)
318 b0a6bcf7 2022-09-13 op procs[src].p_cb = proc_dispatch_null;
320 b0a6bcf7 2022-09-13 op id = procs[src].p_id;
321 b0a6bcf7 2022-09-13 op ps->ps_title[id] = procs[src].p_title;
322 b0a6bcf7 2022-09-13 op if ((ps->ps_ievs[id] = calloc(ps->ps_instances[id],
323 b0a6bcf7 2022-09-13 op sizeof(struct imsgev))) == NULL)
324 b0a6bcf7 2022-09-13 op fatal("%s: calloc", __func__);
326 b0a6bcf7 2022-09-13 op /* With this set up, we are ready to call imsg_init(). */
327 b0a6bcf7 2022-09-13 op for (i = 0; i < ps->ps_instances[id]; i++) {
328 b0a6bcf7 2022-09-13 op ps->ps_ievs[id][i].handler = proc_dispatch;
329 b0a6bcf7 2022-09-13 op ps->ps_ievs[id][i].events = EV_READ;
330 b0a6bcf7 2022-09-13 op ps->ps_ievs[id][i].proc = &procs[src];
331 b0a6bcf7 2022-09-13 op ps->ps_ievs[id][i].data = &ps->ps_ievs[id][i];
336 b0a6bcf7 2022-09-13 op * Allocate pipes for all process instances (incl. parent)
338 b0a6bcf7 2022-09-13 op * - ps->ps_pipes: N:M mapping
339 b0a6bcf7 2022-09-13 op * N source processes connected to M destination processes:
340 b0a6bcf7 2022-09-13 op * [src][instances][dst][instances], for example
341 b0a6bcf7 2022-09-13 op * [PROC_RELAY][3][PROC_CA][3]
343 b0a6bcf7 2022-09-13 op * - ps->ps_pp: per-process 1:M part of ps->ps_pipes
344 b0a6bcf7 2022-09-13 op * Each process instance has a destination array of socketpair fds:
345 b0a6bcf7 2022-09-13 op * [dst][instances], for example
346 b0a6bcf7 2022-09-13 op * [PROC_PARENT][0]
348 b0a6bcf7 2022-09-13 op for (src = 0; src < PROC_MAX; src++) {
349 b0a6bcf7 2022-09-13 op /* Allocate destination array for each process */
350 b0a6bcf7 2022-09-13 op if ((ps->ps_pipes[src] = calloc(ps->ps_instances[src],
351 b0a6bcf7 2022-09-13 op sizeof(struct privsep_pipes))) == NULL)
352 b0a6bcf7 2022-09-13 op fatal("%s: calloc", __func__);
354 b0a6bcf7 2022-09-13 op for (i = 0; i < ps->ps_instances[src]; i++) {
355 b0a6bcf7 2022-09-13 op pp = &ps->ps_pipes[src][i];
357 b0a6bcf7 2022-09-13 op for (dst = 0; dst < PROC_MAX; dst++) {
358 b0a6bcf7 2022-09-13 op /* Allocate maximum fd integers */
359 b0a6bcf7 2022-09-13 op if ((pp->pp_pipes[dst] =
360 b0a6bcf7 2022-09-13 op calloc(ps->ps_instances[dst],
361 b0a6bcf7 2022-09-13 op sizeof(int))) == NULL)
362 b0a6bcf7 2022-09-13 op fatal("%s: calloc", __func__);
364 b0a6bcf7 2022-09-13 op /* Mark fd as unused */
365 b0a6bcf7 2022-09-13 op for (j = 0; j < ps->ps_instances[dst]; j++)
366 b0a6bcf7 2022-09-13 op pp->pp_pipes[dst][j] = -1;
371 b0a6bcf7 2022-09-13 op ps->ps_pp = &ps->ps_pipes[privsep_process][ps->ps_instance];
375 b0a6bcf7 2022-09-13 op proc_kill(struct privsep *ps)
379 b0a6bcf7 2022-09-13 op int len, status;
381 b0a6bcf7 2022-09-13 op if (privsep_process != PROC_PARENT)
384 b0a6bcf7 2022-09-13 op proc_close(ps);
387 b0a6bcf7 2022-09-13 op pid = waitpid(WAIT_ANY, &status, 0);
388 b0a6bcf7 2022-09-13 op if (pid <= 0)
391 b0a6bcf7 2022-09-13 op if (WIFSIGNALED(status)) {
392 b0a6bcf7 2022-09-13 op len = asprintf(&cause, "terminated; signal %d",
393 b0a6bcf7 2022-09-13 op WTERMSIG(status));
394 b0a6bcf7 2022-09-13 op } else if (WIFEXITED(status)) {
395 b0a6bcf7 2022-09-13 op if (WEXITSTATUS(status) != 0)
396 b0a6bcf7 2022-09-13 op len = asprintf(&cause, "exited abnormally");
402 b0a6bcf7 2022-09-13 op if (len == 0) {
403 b0a6bcf7 2022-09-13 op /* child exited OK, don't print a warning message */
404 b0a6bcf7 2022-09-13 op } else if (len != -1) {
405 b0a6bcf7 2022-09-13 op log_warnx("lost child: pid %u %s", pid, cause);
408 b0a6bcf7 2022-09-13 op log_warnx("lost child: pid %u", pid);
409 b0a6bcf7 2022-09-13 op } while (pid != -1 || errno == EINTR);
413 b0a6bcf7 2022-09-13 op proc_open(struct privsep *ps, int src, int dst)
415 b0a6bcf7 2022-09-13 op struct privsep_pipes *pa, *pb;
416 b0a6bcf7 2022-09-13 op struct privsep_fd pf;
418 b0a6bcf7 2022-09-13 op unsigned int i, j;
420 b0a6bcf7 2022-09-13 op /* Exchange pipes between process. */
421 b0a6bcf7 2022-09-13 op for (i = 0; i < ps->ps_instances[src]; i++) {
422 b0a6bcf7 2022-09-13 op for (j = 0; j < ps->ps_instances[dst]; j++) {
423 b0a6bcf7 2022-09-13 op /* Don't create sockets for ourself. */
424 b0a6bcf7 2022-09-13 op if (src == dst && i == j)
427 b0a6bcf7 2022-09-13 op /* Proxies don't talk to each other. */
428 b0a6bcf7 2022-09-13 op if (src == PROC_PROXY && dst == PROC_PROXY)
431 b0a6bcf7 2022-09-13 op pa = &ps->ps_pipes[src][i];
432 b0a6bcf7 2022-09-13 op pb = &ps->ps_pipes[dst][j];
433 b0a6bcf7 2022-09-13 op if (socketpair(AF_UNIX,
434 b0a6bcf7 2022-09-13 op SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC,
435 b0a6bcf7 2022-09-13 op PF_UNSPEC, fds) == -1)
436 b0a6bcf7 2022-09-13 op fatal("%s: socketpair", __func__);
438 b0a6bcf7 2022-09-13 op pa->pp_pipes[dst][j] = fds[0];
439 b0a6bcf7 2022-09-13 op pb->pp_pipes[src][i] = fds[1];
441 b0a6bcf7 2022-09-13 op pf.pf_procid = src;
442 b0a6bcf7 2022-09-13 op pf.pf_instance = i;
443 b0a6bcf7 2022-09-13 op if (proc_compose_imsg(ps, dst, j, IMSG_CTL_PROCFD,
444 b0a6bcf7 2022-09-13 op -1, pb->pp_pipes[src][i], &pf, sizeof(pf)) == -1)
445 b0a6bcf7 2022-09-13 op fatal("%s: proc_compose_imsg", __func__);
447 b0a6bcf7 2022-09-13 op pf.pf_procid = dst;
448 b0a6bcf7 2022-09-13 op pf.pf_instance = j;
449 b0a6bcf7 2022-09-13 op if (proc_compose_imsg(ps, src, i, IMSG_CTL_PROCFD,
450 b0a6bcf7 2022-09-13 op -1, pa->pp_pipes[dst][j], &pf, sizeof(pf)) == -1)
451 b0a6bcf7 2022-09-13 op fatal("%s: proc_compose_imsg", __func__);
454 b0a6bcf7 2022-09-13 op * We have to flush to send the descriptors and close
455 b0a6bcf7 2022-09-13 op * them to avoid the fd ramp on startup.
457 b0a6bcf7 2022-09-13 op if (proc_flush_imsg(ps, src, i) == -1 ||
458 b0a6bcf7 2022-09-13 op proc_flush_imsg(ps, dst, j) == -1)
459 b0a6bcf7 2022-09-13 op fatal("%s: imsg_flush", __func__);
465 b0a6bcf7 2022-09-13 op proc_close(struct privsep *ps)
467 b0a6bcf7 2022-09-13 op unsigned int dst, n;
468 b0a6bcf7 2022-09-13 op struct privsep_pipes *pp;
470 b0a6bcf7 2022-09-13 op if (ps == NULL)
473 b0a6bcf7 2022-09-13 op pp = ps->ps_pp;
475 b0a6bcf7 2022-09-13 op for (dst = 0; dst < PROC_MAX; dst++) {
476 b0a6bcf7 2022-09-13 op if (ps->ps_ievs[dst] == NULL)
479 b0a6bcf7 2022-09-13 op for (n = 0; n < ps->ps_instances[dst]; n++) {
480 b0a6bcf7 2022-09-13 op if (pp->pp_pipes[dst][n] == -1)
483 b0a6bcf7 2022-09-13 op /* Cancel the fd, close and invalidate the fd */
484 b0a6bcf7 2022-09-13 op event_del(&(ps->ps_ievs[dst][n].ev));
485 b0a6bcf7 2022-09-13 op imsg_clear(&(ps->ps_ievs[dst][n].ibuf));
486 b0a6bcf7 2022-09-13 op close(pp->pp_pipes[dst][n]);
487 b0a6bcf7 2022-09-13 op pp->pp_pipes[dst][n] = -1;
489 b0a6bcf7 2022-09-13 op free(ps->ps_ievs[dst]);
494 b0a6bcf7 2022-09-13 op proc_shutdown(struct privsep_proc *p)
496 b0a6bcf7 2022-09-13 op struct privsep *ps = p->p_ps;
498 b0a6bcf7 2022-09-13 op if (p->p_shutdown != NULL)
499 b0a6bcf7 2022-09-13 op (*p->p_shutdown)();
501 b0a6bcf7 2022-09-13 op proc_close(ps);
503 b0a6bcf7 2022-09-13 op log_info("%s exiting, pid %d", p->p_title, getpid());
509 b0a6bcf7 2022-09-13 op proc_sig_handler(int sig, short event, void *arg)
511 b0a6bcf7 2022-09-13 op struct privsep_proc *p = arg;
513 b0a6bcf7 2022-09-13 op switch (sig) {
515 b0a6bcf7 2022-09-13 op case SIGTERM:
516 b0a6bcf7 2022-09-13 op proc_shutdown(p);
518 b0a6bcf7 2022-09-13 op case SIGCHLD:
523 b0a6bcf7 2022-09-13 op fatalx("%s: unexpected signal", __func__);
524 b0a6bcf7 2022-09-13 op /* NOTREACHED */
529 b0a6bcf7 2022-09-13 op proc_run(struct privsep *ps, struct privsep_proc *p,
530 b0a6bcf7 2022-09-13 op struct privsep_proc *procs, unsigned int nproc,
531 b0a6bcf7 2022-09-13 op void (*run)(struct privsep *, struct privsep_proc *, void *), void *arg)
533 b0a6bcf7 2022-09-13 op struct passwd *pw;
534 b0a6bcf7 2022-09-13 op const char *root;
536 b0a6bcf7 2022-09-13 op log_procinit(p->p_title);
538 b0a6bcf7 2022-09-13 op /* Set the process group of the current process */
539 b0a6bcf7 2022-09-13 op setpgid(0, 0);
541 b0a6bcf7 2022-09-13 op /* Use non-standard user */
542 b0a6bcf7 2022-09-13 op if (p->p_pw != NULL)
543 b0a6bcf7 2022-09-13 op pw = p->p_pw;
545 b0a6bcf7 2022-09-13 op pw = ps->ps_pw;
547 b0a6bcf7 2022-09-13 op /* Change root directory */
548 b0a6bcf7 2022-09-13 op if (p->p_chroot != NULL)
549 b0a6bcf7 2022-09-13 op root = p->p_chroot;
551 b0a6bcf7 2022-09-13 op root = pw->pw_dir;
553 b0a6bcf7 2022-09-13 op if (chroot(root) == -1)
554 b0a6bcf7 2022-09-13 op fatal("%s: chroot", __func__);
555 b0a6bcf7 2022-09-13 op if (chdir("/") == -1)
556 b0a6bcf7 2022-09-13 op fatal("%s: chdir(\"/\")", __func__);
558 b0a6bcf7 2022-09-13 op privsep_process = p->p_id;
560 b0a6bcf7 2022-09-13 op setproctitle("%s", p->p_title);
562 b0a6bcf7 2022-09-13 op if (setgroups(1, &pw->pw_gid) ||
563 b0a6bcf7 2022-09-13 op setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) ||
564 b0a6bcf7 2022-09-13 op setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid))
565 b0a6bcf7 2022-09-13 op fatal("%s: cannot drop privileges", __func__);
567 b0a6bcf7 2022-09-13 op event_init();
569 b0a6bcf7 2022-09-13 op signal(SIGPIPE, SIG_IGN);
571 b0a6bcf7 2022-09-13 op signal_set(&ps->ps_evsigint, SIGINT, proc_sig_handler, p);
572 b0a6bcf7 2022-09-13 op signal_set(&ps->ps_evsigterm, SIGTERM, proc_sig_handler, p);
573 b0a6bcf7 2022-09-13 op signal_set(&ps->ps_evsigchld, SIGCHLD, proc_sig_handler, p);
574 b0a6bcf7 2022-09-13 op signal_set(&ps->ps_evsighup, SIGHUP, proc_sig_handler, p);
576 b0a6bcf7 2022-09-13 op signal_add(&ps->ps_evsigint, NULL);
577 b0a6bcf7 2022-09-13 op signal_add(&ps->ps_evsigterm, NULL);
578 b0a6bcf7 2022-09-13 op signal_add(&ps->ps_evsigchld, NULL);
579 b0a6bcf7 2022-09-13 op signal_add(&ps->ps_evsighup, NULL);
581 b0a6bcf7 2022-09-13 op proc_setup(ps, procs, nproc);
582 b0a6bcf7 2022-09-13 op proc_accept(ps, PROC_PARENT_SOCK_FILENO, PROC_PARENT, 0);
584 b0a6bcf7 2022-09-13 op log_debug("%s: %s %d/%d, pid %d", __func__, p->p_title,
585 b0a6bcf7 2022-09-13 op ps->ps_instance + 1, ps->ps_instances[p->p_id], getpid());
587 b0a6bcf7 2022-09-13 op if (run != NULL)
588 b0a6bcf7 2022-09-13 op run(ps, p, arg);
590 b0a6bcf7 2022-09-13 op event_dispatch();
592 b0a6bcf7 2022-09-13 op proc_shutdown(p);
596 b0a6bcf7 2022-09-13 op proc_dispatch(int fd, short event, void *arg)
598 b0a6bcf7 2022-09-13 op struct imsgev *iev = arg;
599 b0a6bcf7 2022-09-13 op struct privsep_proc *p = iev->proc;
600 b0a6bcf7 2022-09-13 op struct privsep *ps = p->p_ps;
601 b0a6bcf7 2022-09-13 op struct imsgbuf *ibuf;
602 b0a6bcf7 2022-09-13 op struct imsg imsg;
604 b0a6bcf7 2022-09-13 op const char *title;
605 b0a6bcf7 2022-09-13 op struct privsep_fd pf;
607 b0a6bcf7 2022-09-13 op title = ps->ps_title[privsep_process];
608 b0a6bcf7 2022-09-13 op ibuf = &iev->ibuf;
610 b0a6bcf7 2022-09-13 op if (event & EV_READ) {
611 b0a6bcf7 2022-09-13 op if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
612 b0a6bcf7 2022-09-13 op fatal("%s: imsg_read", __func__);
613 b0a6bcf7 2022-09-13 op if (n == 0) {
614 b0a6bcf7 2022-09-13 op /* this pipe is dead, so remove the event handler */
615 b0a6bcf7 2022-09-13 op event_del(&iev->ev);
616 b0a6bcf7 2022-09-13 op event_loopexit(NULL);
621 b0a6bcf7 2022-09-13 op if (event & EV_WRITE) {
622 b0a6bcf7 2022-09-13 op if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN)
623 b0a6bcf7 2022-09-13 op fatal("%s: msgbuf_write", __func__);
624 b0a6bcf7 2022-09-13 op if (n == 0) {
625 b0a6bcf7 2022-09-13 op /* this pipe is dead, so remove the event handler */
626 b0a6bcf7 2022-09-13 op event_del(&iev->ev);
627 b0a6bcf7 2022-09-13 op event_loopexit(NULL);
633 b0a6bcf7 2022-09-13 op if ((n = imsg_get(ibuf, &imsg)) == -1)
634 b0a6bcf7 2022-09-13 op fatal("%s: imsg_get", __func__);
638 b0a6bcf7 2022-09-13 op #if DEBUG > 1
639 b0a6bcf7 2022-09-13 op log_debug("%s: %s %d got imsg %d peerid %d from %s %d",
640 b0a6bcf7 2022-09-13 op __func__, title, ps->ps_instance + 1,
641 b0a6bcf7 2022-09-13 op imsg.hdr.type, imsg.hdr.peerid, p->p_title, imsg.hdr.pid);
645 b0a6bcf7 2022-09-13 op * Check the message with the program callback
647 b0a6bcf7 2022-09-13 op if ((p->p_cb)(fd, p, &imsg) == 0) {
648 b0a6bcf7 2022-09-13 op /* Message was handled by the callback, continue */
649 b0a6bcf7 2022-09-13 op imsg_free(&imsg);
654 b0a6bcf7 2022-09-13 op * Generic message handling
656 b0a6bcf7 2022-09-13 op switch (imsg.hdr.type) {
657 b0a6bcf7 2022-09-13 op case IMSG_CTL_PROCFD:
658 b0a6bcf7 2022-09-13 op IMSG_SIZE_CHECK(&imsg, &pf);
659 b0a6bcf7 2022-09-13 op memcpy(&pf, imsg.data, sizeof(pf));
660 b0a6bcf7 2022-09-13 op proc_accept(ps, imsg.fd, pf.pf_procid,
661 b0a6bcf7 2022-09-13 op pf.pf_instance);
664 b0a6bcf7 2022-09-13 op fatalx("%s: %s %d got invalid imsg %d peerid %d "
665 b0a6bcf7 2022-09-13 op "from %s %d",
666 b0a6bcf7 2022-09-13 op __func__, title, ps->ps_instance + 1,
667 b0a6bcf7 2022-09-13 op imsg.hdr.type, imsg.hdr.peerid,
668 b0a6bcf7 2022-09-13 op p->p_title, imsg.hdr.pid);
670 b0a6bcf7 2022-09-13 op imsg_free(&imsg);
672 b0a6bcf7 2022-09-13 op imsg_event_add(iev);
676 b0a6bcf7 2022-09-13 op proc_dispatch_null(int fd, struct privsep_proc *p, struct imsg *imsg)
682 b0a6bcf7 2022-09-13 op * imsg helper functions
686 b0a6bcf7 2022-09-13 op imsg_event_add(struct imsgev *iev)
688 b0a6bcf7 2022-09-13 op if (iev->handler == NULL) {
689 b0a6bcf7 2022-09-13 op imsg_flush(&iev->ibuf);
693 b0a6bcf7 2022-09-13 op iev->events = EV_READ;
694 b0a6bcf7 2022-09-13 op if (iev->ibuf.w.queued)
695 b0a6bcf7 2022-09-13 op iev->events |= EV_WRITE;
697 b0a6bcf7 2022-09-13 op event_del(&iev->ev);
698 b0a6bcf7 2022-09-13 op event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data);
699 b0a6bcf7 2022-09-13 op event_add(&iev->ev, NULL);
703 b0a6bcf7 2022-09-13 op imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
704 b0a6bcf7 2022-09-13 op pid_t pid, int fd, void *data, uint16_t datalen)
708 b0a6bcf7 2022-09-13 op if ((ret = imsg_compose(&iev->ibuf, type, peerid,
709 b0a6bcf7 2022-09-13 op pid, fd, data, datalen)) == -1)
710 b0a6bcf7 2022-09-13 op return (ret);
711 b0a6bcf7 2022-09-13 op imsg_event_add(iev);
712 b0a6bcf7 2022-09-13 op return (ret);
716 b0a6bcf7 2022-09-13 op imsg_composev_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
717 b0a6bcf7 2022-09-13 op pid_t pid, int fd, const struct iovec *iov, int iovcnt)
721 b0a6bcf7 2022-09-13 op if ((ret = imsg_composev(&iev->ibuf, type, peerid,
722 b0a6bcf7 2022-09-13 op pid, fd, iov, iovcnt)) == -1)
723 b0a6bcf7 2022-09-13 op return (ret);
724 b0a6bcf7 2022-09-13 op imsg_event_add(iev);
725 b0a6bcf7 2022-09-13 op return (ret);
729 b0a6bcf7 2022-09-13 op proc_range(struct privsep *ps, enum privsep_procid id, int *n, int *m)
731 b0a6bcf7 2022-09-13 op if (*n == -1) {
732 b0a6bcf7 2022-09-13 op /* Use a range of all target instances */
734 b0a6bcf7 2022-09-13 op *m = ps->ps_instances[id];
736 b0a6bcf7 2022-09-13 op /* Use only a single slot of the specified peer process */
742 b0a6bcf7 2022-09-13 op proc_compose_imsg(struct privsep *ps, enum privsep_procid id, int n,
743 b0a6bcf7 2022-09-13 op uint16_t type, uint32_t peerid, int fd, void *data, uint16_t datalen)
747 b0a6bcf7 2022-09-13 op proc_range(ps, id, &n, &m);
748 b0a6bcf7 2022-09-13 op for (; n < m; n++) {
749 b0a6bcf7 2022-09-13 op if (imsg_compose_event(&ps->ps_ievs[id][n],
750 b0a6bcf7 2022-09-13 op type, peerid, ps->ps_instance + 1, fd, data, datalen) == -1)
758 b0a6bcf7 2022-09-13 op proc_compose(struct privsep *ps, enum privsep_procid id,
759 b0a6bcf7 2022-09-13 op uint16_t type, void *data, uint16_t datalen)
761 b0a6bcf7 2022-09-13 op return (proc_compose_imsg(ps, id, -1, type, -1, -1, data, datalen));
765 b0a6bcf7 2022-09-13 op proc_composev_imsg(struct privsep *ps, enum privsep_procid id, int n,
766 b0a6bcf7 2022-09-13 op uint16_t type, uint32_t peerid, int fd, const struct iovec *iov, int iovcnt)
770 b0a6bcf7 2022-09-13 op proc_range(ps, id, &n, &m);
771 b0a6bcf7 2022-09-13 op for (; n < m; n++)
772 b0a6bcf7 2022-09-13 op if (imsg_composev_event(&ps->ps_ievs[id][n],
773 b0a6bcf7 2022-09-13 op type, peerid, ps->ps_instance + 1, fd, iov, iovcnt) == -1)
780 b0a6bcf7 2022-09-13 op proc_composev(struct privsep *ps, enum privsep_procid id,
781 b0a6bcf7 2022-09-13 op uint16_t type, const struct iovec *iov, int iovcnt)
783 b0a6bcf7 2022-09-13 op return (proc_composev_imsg(ps, id, -1, type, -1, -1, iov, iovcnt));
787 b0a6bcf7 2022-09-13 op proc_forward_imsg(struct privsep *ps, struct imsg *imsg,
788 b0a6bcf7 2022-09-13 op enum privsep_procid id, int n)
790 b0a6bcf7 2022-09-13 op return (proc_compose_imsg(ps, id, n, imsg->hdr.type,
791 b0a6bcf7 2022-09-13 op imsg->hdr.peerid, imsg->fd, imsg->data, IMSG_DATA_SIZE(imsg)));
794 b0a6bcf7 2022-09-13 op struct imsgbuf *
795 b0a6bcf7 2022-09-13 op proc_ibuf(struct privsep *ps, enum privsep_procid id, int n)
799 b0a6bcf7 2022-09-13 op proc_range(ps, id, &n, &m);
800 b0a6bcf7 2022-09-13 op return (&ps->ps_ievs[id][n].ibuf);
803 b0a6bcf7 2022-09-13 op struct imsgev *
804 b0a6bcf7 2022-09-13 op proc_iev(struct privsep *ps, enum privsep_procid id, int n)
808 b0a6bcf7 2022-09-13 op proc_range(ps, id, &n, &m);
809 b0a6bcf7 2022-09-13 op return (&ps->ps_ievs[id][n]);
812 b0a6bcf7 2022-09-13 op /* This function should only be called with care as it breaks async I/O */
814 b0a6bcf7 2022-09-13 op proc_flush_imsg(struct privsep *ps, enum privsep_procid id, int n)
816 b0a6bcf7 2022-09-13 op struct imsgbuf *ibuf;
817 b0a6bcf7 2022-09-13 op int m, ret = 0;
819 b0a6bcf7 2022-09-13 op proc_range(ps, id, &n, &m);
820 b0a6bcf7 2022-09-13 op for (; n < m; n++) {
821 b0a6bcf7 2022-09-13 op if ((ibuf = proc_ibuf(ps, id, n)) == NULL)
824 b0a6bcf7 2022-09-13 op ret = imsg_flush(ibuf);
825 b0a6bcf7 2022-09-13 op } while (ret == -1 && errno == EAGAIN);
826 b0a6bcf7 2022-09-13 op if (ret == -1)
828 b0a6bcf7 2022-09-13 op imsg_event_add(&ps->ps_ievs[id][n]);
831 b0a6bcf7 2022-09-13 op return (ret);