1 6b5c4000 2026-03-02 rsadowski /* $OpenBSD: proc.c,v 1.53 2026/03/02 19:28:01 rsadowski Exp $ */
4 ee80ee17 2016-10-05 reyk * Copyright (c) 2010 - 2016 Reyk Floeter <reyk@openbsd.org>
5 dbef7d4f 2011-05-09 reyk * Copyright (c) 2008 Pierre-Yves Ritschard <pyr@openbsd.org>
7 dbef7d4f 2011-05-09 reyk * Permission to use, copy, modify, and distribute this software for any
8 dbef7d4f 2011-05-09 reyk * purpose with or without fee is hereby granted, provided that the above
9 dbef7d4f 2011-05-09 reyk * copyright notice and this permission notice appear in all copies.
11 dbef7d4f 2011-05-09 reyk * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 dbef7d4f 2011-05-09 reyk * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 dbef7d4f 2011-05-09 reyk * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 dbef7d4f 2011-05-09 reyk * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 dbef7d4f 2011-05-09 reyk * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 dbef7d4f 2011-05-09 reyk * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 dbef7d4f 2011-05-09 reyk * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 dbef7d4f 2011-05-09 reyk #include <sys/types.h>
21 dbef7d4f 2011-05-09 reyk #include <sys/queue.h>
22 dbef7d4f 2011-05-09 reyk #include <sys/socket.h>
23 dbef7d4f 2011-05-09 reyk #include <sys/wait.h>
25 c44f8e44 2016-10-05 rzalamena #include <fcntl.h>
26 dbef7d4f 2011-05-09 reyk #include <stdio.h>
27 dbef7d4f 2011-05-09 reyk #include <stdlib.h>
28 dbef7d4f 2011-05-09 reyk #include <unistd.h>
29 dbef7d4f 2011-05-09 reyk #include <string.h>
30 dbef7d4f 2011-05-09 reyk #include <errno.h>
31 dbef7d4f 2011-05-09 reyk #include <signal.h>
32 1c66e337 2018-09-09 bluhm #include <paths.h>
33 dbef7d4f 2011-05-09 reyk #include <pwd.h>
34 dbef7d4f 2011-05-09 reyk #include <event.h>
35 d93c36af 2015-01-22 reyk #include <imsg.h>
37 dbef7d4f 2011-05-09 reyk #include "relayd.h"
38 6b5c4000 2026-03-02 rsadowski #include "log.h"
40 1c66e337 2018-09-09 bluhm void proc_exec(struct privsep *, struct privsep_proc *, unsigned int, int,
42 41ddf20a 2016-09-03 reyk void proc_setup(struct privsep *, struct privsep_proc *, unsigned int);
43 41ddf20a 2016-09-03 reyk void proc_open(struct privsep *, int, int);
44 41ddf20a 2016-09-03 reyk void proc_accept(struct privsep *, int, enum privsep_procid,
45 41ddf20a 2016-09-03 reyk unsigned int);
46 720a4aa4 2014-04-20 reyk void proc_close(struct privsep *);
47 dbef7d4f 2011-05-09 reyk void proc_shutdown(struct privsep_proc *);
48 dbef7d4f 2011-05-09 reyk void proc_sig_handler(int, short, void *);
49 dbef7d4f 2011-05-09 reyk void proc_range(struct privsep *, enum privsep_procid, int *, int *);
50 42e77f05 2015-11-23 reyk int proc_dispatch_null(int, struct privsep_proc *, struct imsg *);
52 41ddf20a 2016-09-03 reyk enum privsep_procid
53 41ddf20a 2016-09-03 reyk proc_getid(struct privsep_proc *procs, unsigned int nproc,
54 41ddf20a 2016-09-03 reyk const char *proc_name)
56 41ddf20a 2016-09-03 reyk struct privsep_proc *p;
57 41ddf20a 2016-09-03 reyk unsigned int proc;
59 41ddf20a 2016-09-03 reyk for (proc = 0; proc < nproc; proc++) {
60 41ddf20a 2016-09-03 reyk p = &procs[proc];
61 41ddf20a 2016-09-03 reyk if (strcmp(p->p_title, proc_name))
64 41ddf20a 2016-09-03 reyk return (p->p_id);
67 41ddf20a 2016-09-03 reyk return (PROC_MAX);
71 41ddf20a 2016-09-03 reyk proc_exec(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc,
72 8a3d3d28 2022-09-03 benno int argc, char **argv)
74 41ddf20a 2016-09-03 reyk unsigned int proc, nargc, i, proc_i;
75 41ddf20a 2016-09-03 reyk char **nargv;
76 41ddf20a 2016-09-03 reyk struct privsep_proc *p;
77 41ddf20a 2016-09-03 reyk char num[32];
80 41ddf20a 2016-09-03 reyk /* Prepare the new process argv. */
81 41ddf20a 2016-09-03 reyk nargv = calloc(argc + 5, sizeof(char *));
82 41ddf20a 2016-09-03 reyk if (nargv == NULL)
83 41ddf20a 2016-09-03 reyk fatal("%s: calloc", __func__);
85 41ddf20a 2016-09-03 reyk /* Copy call argument first. */
87 41ddf20a 2016-09-03 reyk nargv[nargc++] = argv[0];
89 41ddf20a 2016-09-03 reyk /* Set process name argument and save the position. */
90 41ddf20a 2016-09-03 reyk nargv[nargc++] = "-P";
91 41ddf20a 2016-09-03 reyk proc_i = nargc;
94 41ddf20a 2016-09-03 reyk /* Point process instance arg to stack and copy the original args. */
95 41ddf20a 2016-09-03 reyk nargv[nargc++] = "-I";
96 41ddf20a 2016-09-03 reyk nargv[nargc++] = num;
97 41ddf20a 2016-09-03 reyk for (i = 1; i < (unsigned int) argc; i++)
98 41ddf20a 2016-09-03 reyk nargv[nargc++] = argv[i];
100 41ddf20a 2016-09-03 reyk nargv[nargc] = NULL;
102 41ddf20a 2016-09-03 reyk for (proc = 0; proc < nproc; proc++) {
103 41ddf20a 2016-09-03 reyk p = &procs[proc];
105 41ddf20a 2016-09-03 reyk /* Update args with process title. */
106 87e4c32e 2016-09-28 reyk nargv[proc_i] = (char *)(uintptr_t)p->p_title;
108 41ddf20a 2016-09-03 reyk /* Fire children processes. */
109 41ddf20a 2016-09-03 reyk for (i = 0; i < ps->ps_instances[p->p_id]; i++) {
110 41ddf20a 2016-09-03 reyk /* Update the process instance number. */
111 41ddf20a 2016-09-03 reyk snprintf(num, sizeof(num), "%u", i);
113 41ddf20a 2016-09-03 reyk fd = ps->ps_pipes[p->p_id][i].pp_pipes[PROC_PARENT][0];
114 41ddf20a 2016-09-03 reyk ps->ps_pipes[p->p_id][i].pp_pipes[PROC_PARENT][0] = -1;
116 41ddf20a 2016-09-03 reyk switch (fork()) {
118 41ddf20a 2016-09-03 reyk fatal("%s: fork", __func__);
121 41ddf20a 2016-09-03 reyk /* Prepare parent socket. */
122 c44f8e44 2016-10-05 rzalamena if (fd != PROC_PARENT_SOCK_FILENO) {
123 c44f8e44 2016-10-05 rzalamena if (dup2(fd, PROC_PARENT_SOCK_FILENO)
124 c44f8e44 2016-10-05 rzalamena == -1)
125 c44f8e44 2016-10-05 rzalamena fatal("dup2");
126 c44f8e44 2016-10-05 rzalamena } else if (fcntl(fd, F_SETFD, 0) == -1)
127 c44f8e44 2016-10-05 rzalamena fatal("fcntl");
129 41ddf20a 2016-09-03 reyk execvp(argv[0], nargv);
130 41ddf20a 2016-09-03 reyk fatal("%s: execvp", __func__);
133 41ddf20a 2016-09-03 reyk /* Close child end. */
139 41ddf20a 2016-09-03 reyk free(nargv);
143 41ddf20a 2016-09-03 reyk proc_connect(struct privsep *ps)
145 41ddf20a 2016-09-03 reyk struct imsgev *iev;
146 4b93801a 2016-11-24 reyk unsigned int src, dst, inst;
148 4b93801a 2016-11-24 reyk /* Don't distribute any sockets if we are not really going to run. */
149 4b93801a 2016-11-24 reyk if (ps->ps_noaction)
152 4b93801a 2016-11-24 reyk for (dst = 0; dst < PROC_MAX; dst++) {
153 4b93801a 2016-11-24 reyk /* We don't communicate with ourselves. */
154 4b93801a 2016-11-24 reyk if (dst == PROC_PARENT)
157 4b93801a 2016-11-24 reyk for (inst = 0; inst < ps->ps_instances[dst]; inst++) {
158 4b93801a 2016-11-24 reyk iev = &ps->ps_ievs[dst][inst];
159 418ab141 2024-11-21 claudio if (imsgbuf_init(&iev->ibuf,
160 418ab141 2024-11-21 claudio ps->ps_pp->pp_pipes[dst][inst]) == -1)
161 418ab141 2024-11-21 claudio fatal("imsgbuf_init");
162 418ab141 2024-11-21 claudio imsgbuf_allow_fdpass(&iev->ibuf);
163 41ddf20a 2016-09-03 reyk event_set(&iev->ev, iev->ibuf.fd, iev->events,
164 41ddf20a 2016-09-03 reyk iev->handler, iev->data);
165 41ddf20a 2016-09-03 reyk event_add(&iev->ev, NULL);
169 4b93801a 2016-11-24 reyk /* Distribute the socketpair()s for everyone. */
170 4b93801a 2016-11-24 reyk for (src = 0; src < PROC_MAX; src++)
171 4b93801a 2016-11-24 reyk for (dst = src; dst < PROC_MAX; dst++) {
172 4b93801a 2016-11-24 reyk /* Parent already distributed its fds. */
173 4b93801a 2016-11-24 reyk if (src == PROC_PARENT || dst == PROC_PARENT)
176 4b93801a 2016-11-24 reyk proc_open(ps, src, dst);
181 41ddf20a 2016-09-03 reyk proc_init(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc,
182 1c66e337 2018-09-09 bluhm int debug, int argc, char **argv, enum privsep_procid proc_id)
184 41ddf20a 2016-09-03 reyk struct privsep_proc *p = NULL;
185 4b93801a 2016-11-24 reyk struct privsep_pipes *pa, *pb;
186 41ddf20a 2016-09-03 reyk unsigned int proc;
187 4b93801a 2016-11-24 reyk unsigned int dst;
188 4b93801a 2016-11-24 reyk int fds[2];
190 4b93801a 2016-11-24 reyk /* Don't initiate anything if we are not really going to run. */
191 4b93801a 2016-11-24 reyk if (ps->ps_noaction)
194 41ddf20a 2016-09-03 reyk if (proc_id == PROC_PARENT) {
195 41ddf20a 2016-09-03 reyk privsep_process = PROC_PARENT;
196 41ddf20a 2016-09-03 reyk proc_setup(ps, procs, nproc);
198 8a3d3d28 2022-09-03 benno if (!debug && daemon(1, 0) == -1)
199 8a3d3d28 2022-09-03 benno fatal("failed to daemonize");
202 09e53fee 2017-05-28 benno * Create the children sockets so we can use them
203 4b93801a 2016-11-24 reyk * to distribute the rest of the socketpair()s using
204 4b93801a 2016-11-24 reyk * proc_connect() later.
206 4b93801a 2016-11-24 reyk for (dst = 0; dst < PROC_MAX; dst++) {
207 4b93801a 2016-11-24 reyk /* Don't create socket for ourselves. */
208 4b93801a 2016-11-24 reyk if (dst == PROC_PARENT)
211 4b93801a 2016-11-24 reyk for (proc = 0; proc < ps->ps_instances[dst]; proc++) {
212 4b93801a 2016-11-24 reyk pa = &ps->ps_pipes[PROC_PARENT][0];
213 4b93801a 2016-11-24 reyk pb = &ps->ps_pipes[dst][proc];
214 4b93801a 2016-11-24 reyk if (socketpair(AF_UNIX,
215 4b93801a 2016-11-24 reyk SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC,
216 4b93801a 2016-11-24 reyk PF_UNSPEC, fds) == -1)
217 4b93801a 2016-11-24 reyk fatal("%s: socketpair", __func__);
219 4b93801a 2016-11-24 reyk pa->pp_pipes[dst][proc] = fds[0];
220 4b93801a 2016-11-24 reyk pb->pp_pipes[PROC_PARENT][0] = fds[1];
224 41ddf20a 2016-09-03 reyk /* Engage! */
225 8a3d3d28 2022-09-03 benno proc_exec(ps, procs, nproc, argc, argv);
229 41ddf20a 2016-09-03 reyk /* Initialize a child */
230 41ddf20a 2016-09-03 reyk for (proc = 0; proc < nproc; proc++) {
231 41ddf20a 2016-09-03 reyk if (procs[proc].p_id != proc_id)
233 41ddf20a 2016-09-03 reyk p = &procs[proc];
236 41ddf20a 2016-09-03 reyk if (p == NULL || p->p_init == NULL)
237 41ddf20a 2016-09-03 reyk fatalx("%s: process %d missing process initialization",
238 41ddf20a 2016-09-03 reyk __func__, proc_id);
240 41ddf20a 2016-09-03 reyk p->p_init(ps, p);
242 41ddf20a 2016-09-03 reyk fatalx("failed to initiate child process");
246 41ddf20a 2016-09-03 reyk proc_accept(struct privsep *ps, int fd, enum privsep_procid dst,
247 41ddf20a 2016-09-03 reyk unsigned int n)
249 41ddf20a 2016-09-03 reyk struct privsep_pipes *pp = ps->ps_pp;
250 41ddf20a 2016-09-03 reyk struct imsgev *iev;
252 41ddf20a 2016-09-03 reyk if (ps->ps_ievs[dst] == NULL) {
253 41ddf20a 2016-09-03 reyk #if DEBUG > 1
254 41ddf20a 2016-09-03 reyk log_debug("%s: %s src %d %d to dst %d %d not connected",
255 41ddf20a 2016-09-03 reyk __func__, ps->ps_title[privsep_process],
256 41ddf20a 2016-09-03 reyk privsep_process, ps->ps_instance + 1,
257 41ddf20a 2016-09-03 reyk dst, n + 1);
263 41ddf20a 2016-09-03 reyk if (pp->pp_pipes[dst][n] != -1) {
264 41ddf20a 2016-09-03 reyk log_warnx("%s: duplicated descriptor", __func__);
268 41ddf20a 2016-09-03 reyk pp->pp_pipes[dst][n] = fd;
270 41ddf20a 2016-09-03 reyk iev = &ps->ps_ievs[dst][n];
271 418ab141 2024-11-21 claudio if (imsgbuf_init(&iev->ibuf, fd) == -1)
272 418ab141 2024-11-21 claudio fatal("imsgbuf_init");
273 418ab141 2024-11-21 claudio imsgbuf_allow_fdpass(&iev->ibuf);
274 41ddf20a 2016-09-03 reyk event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data);
275 41ddf20a 2016-09-03 reyk event_add(&iev->ev, NULL);
279 41ddf20a 2016-09-03 reyk proc_setup(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc)
281 41ddf20a 2016-09-03 reyk unsigned int i, j, src, dst, id;
282 41ddf20a 2016-09-03 reyk struct privsep_pipes *pp;
284 41ddf20a 2016-09-03 reyk /* Initialize parent title, ps_instances and procs. */
285 41ddf20a 2016-09-03 reyk ps->ps_title[PROC_PARENT] = "parent";
287 73a39f44 2016-09-02 reyk for (src = 0; src < PROC_MAX; src++)
288 3b28f64e 2016-09-02 reyk /* Default to 1 process instance */
289 3b28f64e 2016-09-02 reyk if (ps->ps_instances[src] < 1)
290 3b28f64e 2016-09-02 reyk ps->ps_instances[src] = 1;
292 41ddf20a 2016-09-03 reyk for (src = 0; src < nproc; src++) {
293 41ddf20a 2016-09-03 reyk procs[src].p_ps = ps;
294 41ddf20a 2016-09-03 reyk if (procs[src].p_cb == NULL)
295 41ddf20a 2016-09-03 reyk procs[src].p_cb = proc_dispatch_null;
297 41ddf20a 2016-09-03 reyk id = procs[src].p_id;
298 41ddf20a 2016-09-03 reyk ps->ps_title[id] = procs[src].p_title;
299 41ddf20a 2016-09-03 reyk if ((ps->ps_ievs[id] = calloc(ps->ps_instances[id],
300 41ddf20a 2016-09-03 reyk sizeof(struct imsgev))) == NULL)
301 4b93801a 2016-11-24 reyk fatal("%s: calloc", __func__);
303 585eb325 2024-11-21 claudio /* With this set up, we are ready to call imsgbuf_init(). */
304 41ddf20a 2016-09-03 reyk for (i = 0; i < ps->ps_instances[id]; i++) {
305 41ddf20a 2016-09-03 reyk ps->ps_ievs[id][i].handler = proc_dispatch;
306 41ddf20a 2016-09-03 reyk ps->ps_ievs[id][i].events = EV_READ;
307 41ddf20a 2016-09-03 reyk ps->ps_ievs[id][i].proc = &procs[src];
308 41ddf20a 2016-09-03 reyk ps->ps_ievs[id][i].data = &ps->ps_ievs[id][i];
313 720a4aa4 2014-04-20 reyk * Allocate pipes for all process instances (incl. parent)
315 720a4aa4 2014-04-20 reyk * - ps->ps_pipes: N:M mapping
316 720a4aa4 2014-04-20 reyk * N source processes connected to M destination processes:
317 720a4aa4 2014-04-20 reyk * [src][instances][dst][instances], for example
318 720a4aa4 2014-04-20 reyk * [PROC_RELAY][3][PROC_CA][3]
320 720a4aa4 2014-04-20 reyk * - ps->ps_pp: per-process 1:M part of ps->ps_pipes
321 720a4aa4 2014-04-20 reyk * Each process instance has a destination array of socketpair fds:
322 720a4aa4 2014-04-20 reyk * [dst][instances], for example
323 720a4aa4 2014-04-20 reyk * [PROC_PARENT][0]
325 720a4aa4 2014-04-20 reyk for (src = 0; src < PROC_MAX; src++) {
326 720a4aa4 2014-04-20 reyk /* Allocate destination array for each process */
327 3b28f64e 2016-09-02 reyk if ((ps->ps_pipes[src] = calloc(ps->ps_instances[src],
328 720a4aa4 2014-04-20 reyk sizeof(struct privsep_pipes))) == NULL)
329 41ddf20a 2016-09-03 reyk fatal("%s: calloc", __func__);
331 3b28f64e 2016-09-02 reyk for (i = 0; i < ps->ps_instances[src]; i++) {
332 720a4aa4 2014-04-20 reyk pp = &ps->ps_pipes[src][i];
334 720a4aa4 2014-04-20 reyk for (dst = 0; dst < PROC_MAX; dst++) {
335 720a4aa4 2014-04-20 reyk /* Allocate maximum fd integers */
336 720a4aa4 2014-04-20 reyk if ((pp->pp_pipes[dst] =
337 3b28f64e 2016-09-02 reyk calloc(ps->ps_instances[dst],
338 720a4aa4 2014-04-20 reyk sizeof(int))) == NULL)
339 41ddf20a 2016-09-03 reyk fatal("%s: calloc", __func__);
341 720a4aa4 2014-04-20 reyk /* Mark fd as unused */
342 3b28f64e 2016-09-02 reyk for (j = 0; j < ps->ps_instances[dst]; j++)
343 720a4aa4 2014-04-20 reyk pp->pp_pipes[dst][j] = -1;
348 41ddf20a 2016-09-03 reyk ps->ps_pp = &ps->ps_pipes[privsep_process][ps->ps_instance];
352 dbef7d4f 2011-05-09 reyk proc_kill(struct privsep *ps)
354 94404df8 2016-09-02 reyk char *cause;
356 94404df8 2016-09-02 reyk int len, status;
358 dbef7d4f 2011-05-09 reyk if (privsep_process != PROC_PARENT)
361 94404df8 2016-09-02 reyk proc_close(ps);
364 94404df8 2016-09-02 reyk pid = waitpid(WAIT_ANY, &status, 0);
365 94404df8 2016-09-02 reyk if (pid <= 0)
368 94404df8 2016-09-02 reyk if (WIFSIGNALED(status)) {
369 94404df8 2016-09-02 reyk len = asprintf(&cause, "terminated; signal %d",
370 94404df8 2016-09-02 reyk WTERMSIG(status));
371 94404df8 2016-09-02 reyk } else if (WIFEXITED(status)) {
372 94404df8 2016-09-02 reyk if (WEXITSTATUS(status) != 0)
373 94404df8 2016-09-02 reyk len = asprintf(&cause, "exited abnormally");
379 94404df8 2016-09-02 reyk if (len == 0) {
380 94404df8 2016-09-02 reyk /* child exited OK, don't print a warning message */
381 94404df8 2016-09-02 reyk } else if (len != -1) {
382 94404df8 2016-09-02 reyk log_warnx("lost child: pid %u %s", pid, cause);
383 94404df8 2016-09-02 reyk free(cause);
385 94404df8 2016-09-02 reyk log_warnx("lost child: pid %u", pid);
386 dbef7d4f 2011-05-09 reyk } while (pid != -1 || (pid == -1 && errno == EINTR));
390 41ddf20a 2016-09-03 reyk proc_open(struct privsep *ps, int src, int dst)
392 720a4aa4 2014-04-20 reyk struct privsep_pipes *pa, *pb;
393 4b93801a 2016-11-24 reyk struct privsep_fd pf;
394 720a4aa4 2014-04-20 reyk int fds[2];
395 41ddf20a 2016-09-03 reyk unsigned int i, j;
397 4b93801a 2016-11-24 reyk /* Exchange pipes between process. */
398 41ddf20a 2016-09-03 reyk for (i = 0; i < ps->ps_instances[src]; i++) {
399 41ddf20a 2016-09-03 reyk for (j = 0; j < ps->ps_instances[dst]; j++) {
400 41ddf20a 2016-09-03 reyk /* Don't create sockets for ourself. */
401 41ddf20a 2016-09-03 reyk if (src == dst && i == j)
404 21a85b54 2021-12-30 dv /* No need for CA to CA or RELAY to RELAY sockets. */
405 21a85b54 2021-12-30 dv if ((src == PROC_CA && dst == PROC_CA) ||
406 21a85b54 2021-12-30 dv (src == PROC_RELAY && dst == PROC_RELAY))
409 41ddf20a 2016-09-03 reyk pa = &ps->ps_pipes[src][i];
410 41ddf20a 2016-09-03 reyk pb = &ps->ps_pipes[dst][j];
411 41ddf20a 2016-09-03 reyk if (socketpair(AF_UNIX,
412 41ddf20a 2016-09-03 reyk SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC,
413 41ddf20a 2016-09-03 reyk PF_UNSPEC, fds) == -1)
414 4b93801a 2016-11-24 reyk fatal("%s: socketpair", __func__);
416 41ddf20a 2016-09-03 reyk pa->pp_pipes[dst][j] = fds[0];
417 41ddf20a 2016-09-03 reyk pb->pp_pipes[src][i] = fds[1];
419 4b93801a 2016-11-24 reyk pf.pf_procid = src;
420 4b93801a 2016-11-24 reyk pf.pf_instance = i;
421 4b93801a 2016-11-24 reyk if (proc_compose_imsg(ps, dst, j, IMSG_CTL_PROCFD,
422 4b93801a 2016-11-24 reyk -1, pb->pp_pipes[src][i], &pf, sizeof(pf)) == -1)
423 4b93801a 2016-11-24 reyk fatal("%s: proc_compose_imsg", __func__);
425 4b93801a 2016-11-24 reyk pf.pf_procid = dst;
426 4b93801a 2016-11-24 reyk pf.pf_instance = j;
427 4b93801a 2016-11-24 reyk if (proc_compose_imsg(ps, src, i, IMSG_CTL_PROCFD,
428 4b93801a 2016-11-24 reyk -1, pa->pp_pipes[dst][j], &pf, sizeof(pf)) == -1)
429 4b93801a 2016-11-24 reyk fatal("%s: proc_compose_imsg", __func__);
432 4b93801a 2016-11-24 reyk * We have to flush to send the descriptors and close
433 4b93801a 2016-11-24 reyk * them to avoid the fd ramp on startup.
435 4b93801a 2016-11-24 reyk if (proc_flush_imsg(ps, src, i) == -1 ||
436 4b93801a 2016-11-24 reyk proc_flush_imsg(ps, dst, j) == -1)
437 585eb325 2024-11-21 claudio fatal("%s: proc_flush_imsg", __func__);
443 720a4aa4 2014-04-20 reyk proc_close(struct privsep *ps)
445 cdf058b0 2015-10-01 reyk unsigned int dst, n;
446 720a4aa4 2014-04-20 reyk struct privsep_pipes *pp;
448 591e6ab5 2011-05-19 reyk if (ps == NULL)
451 720a4aa4 2014-04-20 reyk pp = ps->ps_pp;
453 591e6ab5 2011-05-19 reyk for (dst = 0; dst < PROC_MAX; dst++) {
454 720a4aa4 2014-04-20 reyk if (ps->ps_ievs[dst] == NULL)
457 720a4aa4 2014-04-20 reyk for (n = 0; n < ps->ps_instances[dst]; n++) {
458 720a4aa4 2014-04-20 reyk if (pp->pp_pipes[dst][n] == -1)
461 720a4aa4 2014-04-20 reyk /* Cancel the fd, close and invalidate the fd */
462 720a4aa4 2014-04-20 reyk event_del(&(ps->ps_ievs[dst][n].ev));
463 585eb325 2024-11-21 claudio imsgbuf_clear(&(ps->ps_ievs[dst][n].ibuf));
464 720a4aa4 2014-04-20 reyk close(pp->pp_pipes[dst][n]);
465 720a4aa4 2014-04-20 reyk pp->pp_pipes[dst][n] = -1;
467 720a4aa4 2014-04-20 reyk free(ps->ps_ievs[dst]);
472 dbef7d4f 2011-05-09 reyk proc_shutdown(struct privsep_proc *p)
474 dbef7d4f 2011-05-09 reyk struct privsep *ps = p->p_ps;
476 dbef7d4f 2011-05-09 reyk if (p->p_id == PROC_CONTROL && ps)
477 dbef7d4f 2011-05-09 reyk control_cleanup(&ps->ps_csock);
479 dbef7d4f 2011-05-09 reyk if (p->p_shutdown != NULL)
480 dbef7d4f 2011-05-09 reyk (*p->p_shutdown)();
482 720a4aa4 2014-04-20 reyk proc_close(ps);
484 dbef7d4f 2011-05-09 reyk log_info("%s exiting, pid %d", p->p_title, getpid());
490 dbef7d4f 2011-05-09 reyk proc_sig_handler(int sig, short event, void *arg)
492 dbef7d4f 2011-05-09 reyk struct privsep_proc *p = arg;
494 dbef7d4f 2011-05-09 reyk switch (sig) {
495 dbef7d4f 2011-05-09 reyk case SIGINT:
496 dbef7d4f 2011-05-09 reyk case SIGTERM:
497 dbef7d4f 2011-05-09 reyk proc_shutdown(p);
499 dbef7d4f 2011-05-09 reyk case SIGCHLD:
500 dbef7d4f 2011-05-09 reyk case SIGHUP:
501 dbef7d4f 2011-05-09 reyk case SIGPIPE:
502 7629917f 2014-08-18 reyk case SIGUSR1:
503 dbef7d4f 2011-05-09 reyk /* ignore */
506 09e53fee 2017-05-28 benno fatalx("%s: unexpected signal", __func__);
507 dbef7d4f 2011-05-09 reyk /* NOTREACHED */
512 dbef7d4f 2011-05-09 reyk proc_run(struct privsep *ps, struct privsep_proc *p,
513 cdf058b0 2015-10-01 reyk struct privsep_proc *procs, unsigned int nproc,
514 42e77f05 2015-11-23 reyk void (*run)(struct privsep *, struct privsep_proc *, void *), void *arg)
516 ee80ee17 2016-10-05 reyk struct passwd *pw;
517 fb3cc10c 2014-05-08 blambert const char *root;
518 fb3cc10c 2014-05-08 blambert struct control_sock *rcs;
520 41ddf20a 2016-09-03 reyk log_procinit(p->p_title);
522 720a4aa4 2014-04-20 reyk if (p->p_id == PROC_CONTROL && ps->ps_instance == 0) {
523 dbef7d4f 2011-05-09 reyk if (control_init(ps, &ps->ps_csock) == -1)
524 4b93801a 2016-11-24 reyk fatalx("%s: control_init", __func__);
525 fb3cc10c 2014-05-08 blambert TAILQ_FOREACH(rcs, &ps->ps_rcsocks, cs_entry)
526 fb3cc10c 2014-05-08 blambert if (control_init(ps, rcs) == -1)
527 4b93801a 2016-11-24 reyk fatalx("%s: control_init", __func__);
530 ee80ee17 2016-10-05 reyk /* Use non-standard user */
531 ee80ee17 2016-10-05 reyk if (p->p_pw != NULL)
532 ee80ee17 2016-10-05 reyk pw = p->p_pw;
534 ee80ee17 2016-10-05 reyk pw = ps->ps_pw;
536 dbef7d4f 2011-05-09 reyk /* Change root directory */
537 dbef7d4f 2011-05-09 reyk if (p->p_chroot != NULL)
538 dbef7d4f 2011-05-09 reyk root = p->p_chroot;
540 dbef7d4f 2011-05-09 reyk root = pw->pw_dir;
542 dbef7d4f 2011-05-09 reyk if (chroot(root) == -1)
543 09e53fee 2017-05-28 benno fatal("%s: chroot", __func__);
544 dbef7d4f 2011-05-09 reyk if (chdir("/") == -1)
545 09e53fee 2017-05-28 benno fatal("%s: chdir(\"/\")", __func__);
547 dbef7d4f 2011-05-09 reyk privsep_process = p->p_id;
549 dbef7d4f 2011-05-09 reyk setproctitle("%s", p->p_title);
551 dbef7d4f 2011-05-09 reyk if (setgroups(1, &pw->pw_gid) ||
552 dbef7d4f 2011-05-09 reyk setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) ||
553 dbef7d4f 2011-05-09 reyk setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid))
554 09e53fee 2017-05-28 benno fatal("%s: cannot drop privileges", __func__);
556 dbef7d4f 2011-05-09 reyk event_init();
558 dbef7d4f 2011-05-09 reyk signal_set(&ps->ps_evsigint, SIGINT, proc_sig_handler, p);
559 dbef7d4f 2011-05-09 reyk signal_set(&ps->ps_evsigterm, SIGTERM, proc_sig_handler, p);
560 dbef7d4f 2011-05-09 reyk signal_set(&ps->ps_evsigchld, SIGCHLD, proc_sig_handler, p);
561 dbef7d4f 2011-05-09 reyk signal_set(&ps->ps_evsighup, SIGHUP, proc_sig_handler, p);
562 dbef7d4f 2011-05-09 reyk signal_set(&ps->ps_evsigpipe, SIGPIPE, proc_sig_handler, p);
563 7629917f 2014-08-18 reyk signal_set(&ps->ps_evsigusr1, SIGUSR1, proc_sig_handler, p);
565 dbef7d4f 2011-05-09 reyk signal_add(&ps->ps_evsigint, NULL);
566 dbef7d4f 2011-05-09 reyk signal_add(&ps->ps_evsigterm, NULL);
567 dbef7d4f 2011-05-09 reyk signal_add(&ps->ps_evsigchld, NULL);
568 dbef7d4f 2011-05-09 reyk signal_add(&ps->ps_evsighup, NULL);
569 dbef7d4f 2011-05-09 reyk signal_add(&ps->ps_evsigpipe, NULL);
570 7629917f 2014-08-18 reyk signal_add(&ps->ps_evsigusr1, NULL);
572 41ddf20a 2016-09-03 reyk proc_setup(ps, procs, nproc);
573 9179ded7 2016-09-03 reyk proc_accept(ps, PROC_PARENT_SOCK_FILENO, PROC_PARENT, 0);
574 dbef7d4f 2011-05-09 reyk if (p->p_id == PROC_CONTROL && ps->ps_instance == 0) {
575 dbef7d4f 2011-05-09 reyk if (control_listen(&ps->ps_csock) == -1)
576 4b93801a 2016-11-24 reyk fatalx("%s: control_listen", __func__);
577 fb3cc10c 2014-05-08 blambert TAILQ_FOREACH(rcs, &ps->ps_rcsocks, cs_entry)
578 fb3cc10c 2014-05-08 blambert if (control_listen(rcs) == -1)
579 4b93801a 2016-11-24 reyk fatalx("%s: control_listen", __func__);
582 41ddf20a 2016-09-03 reyk DPRINTF("%s: %s %d/%d, pid %d", __func__, p->p_title,
583 41ddf20a 2016-09-03 reyk ps->ps_instance + 1, ps->ps_instances[p->p_id], getpid());
585 42e77f05 2015-11-23 reyk if (run != NULL)
586 42e77f05 2015-11-23 reyk run(ps, p, arg);
588 dbef7d4f 2011-05-09 reyk event_dispatch();
590 dbef7d4f 2011-05-09 reyk proc_shutdown(p);
594 dbef7d4f 2011-05-09 reyk proc_dispatch(int fd, short event, void *arg)
596 6e65a975 2013-01-17 bluhm struct imsgev *iev = arg;
597 dbef7d4f 2011-05-09 reyk struct privsep_proc *p = iev->proc;
598 dbef7d4f 2011-05-09 reyk struct privsep *ps = p->p_ps;
599 dbef7d4f 2011-05-09 reyk struct imsgbuf *ibuf;
600 dbef7d4f 2011-05-09 reyk struct imsg imsg;
602 dbef7d4f 2011-05-09 reyk int verbose;
603 dbef7d4f 2011-05-09 reyk const char *title;
604 41ddf20a 2016-09-03 reyk struct privsep_fd pf;
606 dbef7d4f 2011-05-09 reyk title = ps->ps_title[privsep_process];
607 dbef7d4f 2011-05-09 reyk ibuf = &iev->ibuf;
609 dbef7d4f 2011-05-09 reyk if (event & EV_READ) {
610 a523d270 2024-11-21 claudio if ((n = imsgbuf_read(ibuf)) == -1)
611 585eb325 2024-11-21 claudio fatal("%s: imsgbuf_read", __func__);
612 dbef7d4f 2011-05-09 reyk if (n == 0) {
613 dbef7d4f 2011-05-09 reyk /* this pipe is dead, so remove the event handler */
614 dbef7d4f 2011-05-09 reyk event_del(&iev->ev);
615 dbef7d4f 2011-05-09 reyk event_loopexit(NULL);
620 dbef7d4f 2011-05-09 reyk if (event & EV_WRITE) {
621 585eb325 2024-11-21 claudio if (imsgbuf_write(ibuf) == -1) {
622 41ddc9d1 2024-11-21 claudio if (errno == EPIPE) {
623 41ddc9d1 2024-11-21 claudio /* this pipe is dead, remove the handler */
624 41ddc9d1 2024-11-21 claudio event_del(&iev->ev);
625 41ddc9d1 2024-11-21 claudio event_loopexit(NULL);
628 585eb325 2024-11-21 claudio fatal("%s: imsgbuf_write", __func__);
633 dbef7d4f 2011-05-09 reyk if ((n = imsg_get(ibuf, &imsg)) == -1)
634 4b93801a 2016-11-24 reyk fatal("%s: imsg_get", __func__);
635 dbef7d4f 2011-05-09 reyk if (n == 0)
638 591e6ab5 2011-05-19 reyk #if DEBUG > 1
639 57032c68 2015-12-07 reyk log_debug("%s: %s %d got imsg %d peerid %d from %s %d",
640 dbef7d4f 2011-05-09 reyk __func__, title, ps->ps_instance + 1,
641 3b28f64e 2016-09-02 reyk imsg.hdr.type, imsg.hdr.peerid, p->p_title, imsg.hdr.pid);
645 dbef7d4f 2011-05-09 reyk * Check the message with the program callback
647 dbef7d4f 2011-05-09 reyk if ((p->p_cb)(fd, p, &imsg) == 0) {
648 dbef7d4f 2011-05-09 reyk /* Message was handled by the callback, continue */
649 dbef7d4f 2011-05-09 reyk imsg_free(&imsg);
654 dbef7d4f 2011-05-09 reyk * Generic message handling
656 dbef7d4f 2011-05-09 reyk switch (imsg.hdr.type) {
657 dbef7d4f 2011-05-09 reyk case IMSG_CTL_VERBOSE:
658 dbef7d4f 2011-05-09 reyk IMSG_SIZE_CHECK(&imsg, &verbose);
659 dbef7d4f 2011-05-09 reyk memcpy(&verbose, imsg.data, sizeof(verbose));
660 afbe8d84 2017-01-09 reyk log_setverbose(verbose);
662 41ddf20a 2016-09-03 reyk case IMSG_CTL_PROCFD:
663 41ddf20a 2016-09-03 reyk IMSG_SIZE_CHECK(&imsg, &pf);
664 41ddf20a 2016-09-03 reyk memcpy(&pf, imsg.data, sizeof(pf));
665 754759d6 2024-01-17 claudio proc_accept(ps, imsg_get_fd(&imsg), pf.pf_procid,
666 41ddf20a 2016-09-03 reyk pf.pf_instance);
669 4b93801a 2016-11-24 reyk fatalx("%s: %s %d got invalid imsg %d peerid %d "
670 57032c68 2015-12-07 reyk "from %s %d",
671 dbef7d4f 2011-05-09 reyk __func__, title, ps->ps_instance + 1,
672 57032c68 2015-12-07 reyk imsg.hdr.type, imsg.hdr.peerid,
673 3b28f64e 2016-09-02 reyk p->p_title, imsg.hdr.pid);
675 dbef7d4f 2011-05-09 reyk imsg_free(&imsg);
677 dbef7d4f 2011-05-09 reyk imsg_event_add(iev);
681 42e77f05 2015-11-23 reyk proc_dispatch_null(int fd, struct privsep_proc *p, struct imsg *imsg)
683 42e77f05 2015-11-23 reyk return (-1);
687 dbef7d4f 2011-05-09 reyk * imsg helper functions
691 dbef7d4f 2011-05-09 reyk imsg_event_add(struct imsgev *iev)
693 dbef7d4f 2011-05-09 reyk if (iev->handler == NULL) {
694 585eb325 2024-11-21 claudio imsgbuf_flush(&iev->ibuf);
698 dbef7d4f 2011-05-09 reyk iev->events = EV_READ;
699 4fa30ed3 2024-11-21 claudio if (imsgbuf_queuelen(&iev->ibuf) > 0)
700 dbef7d4f 2011-05-09 reyk iev->events |= EV_WRITE;
702 dbef7d4f 2011-05-09 reyk event_del(&iev->ev);
703 dbef7d4f 2011-05-09 reyk event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data);
704 dbef7d4f 2011-05-09 reyk event_add(&iev->ev, NULL);
708 cdf058b0 2015-10-01 reyk imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
709 cdf058b0 2015-10-01 reyk pid_t pid, int fd, void *data, uint16_t datalen)
713 dbef7d4f 2011-05-09 reyk if ((ret = imsg_compose(&iev->ibuf, type, peerid,
714 dbef7d4f 2011-05-09 reyk pid, fd, data, datalen)) == -1)
715 dbef7d4f 2011-05-09 reyk return (ret);
716 dbef7d4f 2011-05-09 reyk imsg_event_add(iev);
717 dbef7d4f 2011-05-09 reyk return (ret);
721 cdf058b0 2015-10-01 reyk imsg_composev_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
722 dbef7d4f 2011-05-09 reyk pid_t pid, int fd, const struct iovec *iov, int iovcnt)
726 dbef7d4f 2011-05-09 reyk if ((ret = imsg_composev(&iev->ibuf, type, peerid,
727 dbef7d4f 2011-05-09 reyk pid, fd, iov, iovcnt)) == -1)
728 dbef7d4f 2011-05-09 reyk return (ret);
729 dbef7d4f 2011-05-09 reyk imsg_event_add(iev);
730 dbef7d4f 2011-05-09 reyk return (ret);
734 dbef7d4f 2011-05-09 reyk proc_range(struct privsep *ps, enum privsep_procid id, int *n, int *m)
736 dbef7d4f 2011-05-09 reyk if (*n == -1) {
737 720a4aa4 2014-04-20 reyk /* Use a range of all target instances */
739 720a4aa4 2014-04-20 reyk *m = ps->ps_instances[id];
741 dbef7d4f 2011-05-09 reyk /* Use only a single slot of the specified peer process */
742 dbef7d4f 2011-05-09 reyk *m = *n + 1;
747 dbef7d4f 2011-05-09 reyk proc_compose_imsg(struct privsep *ps, enum privsep_procid id, int n,
748 141b9058 2015-12-02 reyk uint16_t type, uint32_t peerid, int fd, void *data, uint16_t datalen)
752 dbef7d4f 2011-05-09 reyk proc_range(ps, id, &n, &m);
753 720a4aa4 2014-04-20 reyk for (; n < m; n++) {
754 dbef7d4f 2011-05-09 reyk if (imsg_compose_event(&ps->ps_ievs[id][n],
755 3b28f64e 2016-09-02 reyk type, peerid, ps->ps_instance + 1, fd, data, datalen) == -1)
756 dbef7d4f 2011-05-09 reyk return (-1);
759 dbef7d4f 2011-05-09 reyk return (0);
763 141b9058 2015-12-02 reyk proc_compose(struct privsep *ps, enum privsep_procid id,
764 141b9058 2015-12-02 reyk uint16_t type, void *data, uint16_t datalen)
766 141b9058 2015-12-02 reyk return (proc_compose_imsg(ps, id, -1, type, -1, -1, data, datalen));
770 dbef7d4f 2011-05-09 reyk proc_composev_imsg(struct privsep *ps, enum privsep_procid id, int n,
771 141b9058 2015-12-02 reyk uint16_t type, uint32_t peerid, int fd, const struct iovec *iov, int iovcnt)
775 dbef7d4f 2011-05-09 reyk proc_range(ps, id, &n, &m);
776 dbef7d4f 2011-05-09 reyk for (; n < m; n++)
777 dbef7d4f 2011-05-09 reyk if (imsg_composev_event(&ps->ps_ievs[id][n],
778 3b28f64e 2016-09-02 reyk type, peerid, ps->ps_instance + 1, fd, iov, iovcnt) == -1)
779 dbef7d4f 2011-05-09 reyk return (-1);
781 dbef7d4f 2011-05-09 reyk return (0);
785 141b9058 2015-12-02 reyk proc_composev(struct privsep *ps, enum privsep_procid id,
786 141b9058 2015-12-02 reyk uint16_t type, const struct iovec *iov, int iovcnt)
788 141b9058 2015-12-02 reyk return (proc_composev_imsg(ps, id, -1, type, -1, -1, iov, iovcnt));
792 dbef7d4f 2011-05-09 reyk proc_forward_imsg(struct privsep *ps, struct imsg *imsg,
793 dbef7d4f 2011-05-09 reyk enum privsep_procid id, int n)
795 dbef7d4f 2011-05-09 reyk return (proc_compose_imsg(ps, id, n, imsg->hdr.type,
796 754759d6 2024-01-17 claudio imsg->hdr.peerid, -1, imsg->data, IMSG_DATA_SIZE(imsg)));
799 dbef7d4f 2011-05-09 reyk struct imsgbuf *
800 dbef7d4f 2011-05-09 reyk proc_ibuf(struct privsep *ps, enum privsep_procid id, int n)
804 dbef7d4f 2011-05-09 reyk proc_range(ps, id, &n, &m);
805 dbef7d4f 2011-05-09 reyk return (&ps->ps_ievs[id][n].ibuf);
808 83f0e184 2014-04-18 reyk struct imsgev *
809 83f0e184 2014-04-18 reyk proc_iev(struct privsep *ps, enum privsep_procid id, int n)
813 83f0e184 2014-04-18 reyk proc_range(ps, id, &n, &m);
814 83f0e184 2014-04-18 reyk return (&ps->ps_ievs[id][n]);
817 4b93801a 2016-11-24 reyk /* This function should only be called with care as it breaks async I/O */
819 4b93801a 2016-11-24 reyk proc_flush_imsg(struct privsep *ps, enum privsep_procid id, int n)
821 4b93801a 2016-11-24 reyk struct imsgbuf *ibuf;
822 4b93801a 2016-11-24 reyk int m, ret = 0;
824 4b93801a 2016-11-24 reyk proc_range(ps, id, &n, &m);
825 4b93801a 2016-11-24 reyk for (; n < m; n++) {
826 4b93801a 2016-11-24 reyk if ((ibuf = proc_ibuf(ps, id, n)) == NULL)
827 4b93801a 2016-11-24 reyk return (-1);
828 585eb325 2024-11-21 claudio if ((ret = imsgbuf_flush(ibuf)) == -1)
830 4b93801a 2016-11-24 reyk imsg_event_add(&ps->ps_ievs[id][n]);
833 4b93801a 2016-11-24 reyk return (ret);
