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 4a367fcd 2022-09-29 op #include <grp.h>
28 b0a6bcf7 2022-09-13 op #include <limits.h>
29 b0a6bcf7 2022-09-13 op #include <stdio.h>
30 b0a6bcf7 2022-09-13 op #include <stdlib.h>
31 b0a6bcf7 2022-09-13 op #include <unistd.h>
32 b0a6bcf7 2022-09-13 op #include <string.h>
33 b0a6bcf7 2022-09-13 op #include <errno.h>
34 b0a6bcf7 2022-09-13 op #include <signal.h>
35 b0a6bcf7 2022-09-13 op #include <paths.h>
36 b0a6bcf7 2022-09-13 op #include <pwd.h>
37 b0a6bcf7 2022-09-13 op #include <event.h>
38 b0a6bcf7 2022-09-13 op #include <imsg.h>
40 b0a6bcf7 2022-09-13 op #include "log.h"
41 b0a6bcf7 2022-09-13 op #include "proc.h"
43 b0a6bcf7 2022-09-13 op #include "galileo.h"
45 b0a6bcf7 2022-09-13 op void proc_exec(struct privsep *, struct privsep_proc *, unsigned int, int,
46 b0a6bcf7 2022-09-13 op int, char **);
47 b0a6bcf7 2022-09-13 op void proc_setup(struct privsep *, struct privsep_proc *, unsigned int);
48 b0a6bcf7 2022-09-13 op void proc_open(struct privsep *, int, int);
49 b0a6bcf7 2022-09-13 op void proc_accept(struct privsep *, int, enum privsep_procid,
50 b0a6bcf7 2022-09-13 op unsigned int);
51 b0a6bcf7 2022-09-13 op void proc_close(struct privsep *);
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 *);
57 b0a6bcf7 2022-09-13 op enum privsep_procid
58 b0a6bcf7 2022-09-13 op proc_getid(struct privsep_proc *procs, unsigned int nproc,
59 b0a6bcf7 2022-09-13 op const char *proc_name)
61 b0a6bcf7 2022-09-13 op struct privsep_proc *p;
62 b0a6bcf7 2022-09-13 op unsigned int proc;
64 b0a6bcf7 2022-09-13 op for (proc = 0; proc < nproc; proc++) {
65 b0a6bcf7 2022-09-13 op p = &procs[proc];
66 b0a6bcf7 2022-09-13 op if (strcmp(p->p_title, proc_name))
69 b0a6bcf7 2022-09-13 op return (p->p_id);
72 b0a6bcf7 2022-09-13 op return (PROC_MAX);
76 b0a6bcf7 2022-09-13 op proc_exec(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc,
77 b0a6bcf7 2022-09-13 op int debug, int argc, char **argv)
79 b0a6bcf7 2022-09-13 op unsigned int proc, nargc, i, proc_i;
81 b0a6bcf7 2022-09-13 op struct privsep_proc *p;
85 b0a6bcf7 2022-09-13 op /* Prepare the new process argv. */
86 b0a6bcf7 2022-09-13 op nargv = calloc(argc + 5, sizeof(char *));
87 b0a6bcf7 2022-09-13 op if (nargv == NULL)
88 b0a6bcf7 2022-09-13 op fatal("%s: calloc", __func__);
90 b0a6bcf7 2022-09-13 op /* Copy call argument first. */
92 b0a6bcf7 2022-09-13 op nargv[nargc++] = argv[0];
94 b0a6bcf7 2022-09-13 op /* Set process name argument and save the position. */
95 b0a6bcf7 2022-09-13 op nargv[nargc++] = "-P";
96 b0a6bcf7 2022-09-13 op proc_i = nargc;
99 b0a6bcf7 2022-09-13 op /* Point process instance arg to stack and copy the original args. */
100 b0a6bcf7 2022-09-13 op nargv[nargc++] = "-I";
101 b0a6bcf7 2022-09-13 op nargv[nargc++] = num;
102 b0a6bcf7 2022-09-13 op for (i = 1; i < (unsigned int) argc; i++)
103 b0a6bcf7 2022-09-13 op nargv[nargc++] = argv[i];
105 b0a6bcf7 2022-09-13 op nargv[nargc] = NULL;
107 b0a6bcf7 2022-09-13 op for (proc = 0; proc < nproc; proc++) {
108 b0a6bcf7 2022-09-13 op p = &procs[proc];
110 b0a6bcf7 2022-09-13 op /* Update args with process title. */
111 b0a6bcf7 2022-09-13 op nargv[proc_i] = (char *)(uintptr_t)p->p_title;
113 b0a6bcf7 2022-09-13 op /* Fire children processes. */
114 b0a6bcf7 2022-09-13 op for (i = 0; i < ps->ps_instances[p->p_id]; i++) {
115 b0a6bcf7 2022-09-13 op /* Update the process instance number. */
116 b0a6bcf7 2022-09-13 op snprintf(num, sizeof(num), "%u", i);
118 b0a6bcf7 2022-09-13 op fd = ps->ps_pipes[p->p_id][i].pp_pipes[PROC_PARENT][0];
119 b0a6bcf7 2022-09-13 op ps->ps_pipes[p->p_id][i].pp_pipes[PROC_PARENT][0] = -1;
121 b0a6bcf7 2022-09-13 op switch (fork()) {
123 b0a6bcf7 2022-09-13 op fatal("%s: fork", __func__);
126 b0a6bcf7 2022-09-13 op /* First create a new session */
127 b0a6bcf7 2022-09-13 op if (setsid() == -1)
128 b0a6bcf7 2022-09-13 op fatal("setsid");
130 b0a6bcf7 2022-09-13 op /* Prepare parent socket. */
131 b0a6bcf7 2022-09-13 op if (fd != PROC_PARENT_SOCK_FILENO) {
132 b0a6bcf7 2022-09-13 op if (dup2(fd, PROC_PARENT_SOCK_FILENO)
134 b0a6bcf7 2022-09-13 op fatal("dup2");
135 b0a6bcf7 2022-09-13 op } else if (fcntl(fd, F_SETFD, 0) == -1)
136 b0a6bcf7 2022-09-13 op fatal("fcntl");
138 b0a6bcf7 2022-09-13 op /* Daemons detach from terminal. */
139 b0a6bcf7 2022-09-13 op if (!debug && (fd =
140 b0a6bcf7 2022-09-13 op open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
141 b0a6bcf7 2022-09-13 op (void)dup2(fd, STDIN_FILENO);
142 b0a6bcf7 2022-09-13 op (void)dup2(fd, STDOUT_FILENO);
143 b0a6bcf7 2022-09-13 op (void)dup2(fd, STDERR_FILENO);
145 b0a6bcf7 2022-09-13 op (void)close(fd);
148 b0a6bcf7 2022-09-13 op execvp(argv[0], nargv);
149 b0a6bcf7 2022-09-13 op fatal("%s: execvp", __func__);
152 b0a6bcf7 2022-09-13 op /* Close child end. */
162 b0a6bcf7 2022-09-13 op proc_connect(struct privsep *ps)
164 b0a6bcf7 2022-09-13 op struct imsgev *iev;
165 b0a6bcf7 2022-09-13 op unsigned int src, dst, inst;
167 b0a6bcf7 2022-09-13 op /* Don't distribute any sockets if we are not really going to run. */
168 b0a6bcf7 2022-09-13 op if (ps->ps_noaction)
171 b0a6bcf7 2022-09-13 op for (dst = 0; dst < PROC_MAX; dst++) {
172 b0a6bcf7 2022-09-13 op /* We don't communicate with ourselves. */
173 b0a6bcf7 2022-09-13 op if (dst == PROC_PARENT)
176 b0a6bcf7 2022-09-13 op for (inst = 0; inst < ps->ps_instances[dst]; inst++) {
177 b0a6bcf7 2022-09-13 op iev = &ps->ps_ievs[dst][inst];
178 b0a6bcf7 2022-09-13 op imsg_init(&iev->ibuf, ps->ps_pp->pp_pipes[dst][inst]);
179 b0a6bcf7 2022-09-13 op event_set(&iev->ev, iev->ibuf.fd, iev->events,
180 b0a6bcf7 2022-09-13 op iev->handler, iev->data);
181 b0a6bcf7 2022-09-13 op event_add(&iev->ev, NULL);
185 b0a6bcf7 2022-09-13 op /* Distribute the socketpair()s for everyone. */
186 b0a6bcf7 2022-09-13 op for (src = 0; src < PROC_MAX; src++)
187 b0a6bcf7 2022-09-13 op for (dst = src; dst < PROC_MAX; dst++) {
188 b0a6bcf7 2022-09-13 op /* Parent already distributed its fds. */
189 b0a6bcf7 2022-09-13 op if (src == PROC_PARENT || dst == PROC_PARENT)
192 b0a6bcf7 2022-09-13 op proc_open(ps, src, dst);
197 b0a6bcf7 2022-09-13 op proc_init(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc,
198 b0a6bcf7 2022-09-13 op int debug, int argc, char **argv, enum privsep_procid proc_id)
200 b0a6bcf7 2022-09-13 op struct privsep_proc *p = NULL;
201 b0a6bcf7 2022-09-13 op struct privsep_pipes *pa, *pb;
202 b0a6bcf7 2022-09-13 op unsigned int proc;
203 b0a6bcf7 2022-09-13 op unsigned int dst;
206 b0a6bcf7 2022-09-13 op /* Don't initiate anything if we are not really going to run. */
207 b0a6bcf7 2022-09-13 op if (ps->ps_noaction)
210 b0a6bcf7 2022-09-13 op if (proc_id == PROC_PARENT) {
211 b0a6bcf7 2022-09-13 op privsep_process = PROC_PARENT;
212 b0a6bcf7 2022-09-13 op proc_setup(ps, procs, nproc);
215 b0a6bcf7 2022-09-13 op * Create the children sockets so we can use them
216 b0a6bcf7 2022-09-13 op * to distribute the rest of the socketpair()s using
217 b0a6bcf7 2022-09-13 op * proc_connect() later.
219 b0a6bcf7 2022-09-13 op for (dst = 0; dst < PROC_MAX; dst++) {
220 b0a6bcf7 2022-09-13 op /* Don't create socket for ourselves. */
221 b0a6bcf7 2022-09-13 op if (dst == PROC_PARENT)
224 b0a6bcf7 2022-09-13 op for (proc = 0; proc < ps->ps_instances[dst]; proc++) {
225 b0a6bcf7 2022-09-13 op pa = &ps->ps_pipes[PROC_PARENT][0];
226 b0a6bcf7 2022-09-13 op pb = &ps->ps_pipes[dst][proc];
227 b0a6bcf7 2022-09-13 op if (socketpair(AF_UNIX,
228 b0a6bcf7 2022-09-13 op SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC,
229 b0a6bcf7 2022-09-13 op PF_UNSPEC, fds) == -1)
230 b0a6bcf7 2022-09-13 op fatal("%s: socketpair", __func__);
232 b0a6bcf7 2022-09-13 op pa->pp_pipes[dst][proc] = fds[0];
233 b0a6bcf7 2022-09-13 op pb->pp_pipes[PROC_PARENT][0] = fds[1];
237 b0a6bcf7 2022-09-13 op /* Engage! */
238 b0a6bcf7 2022-09-13 op proc_exec(ps, procs, nproc, debug, argc, argv);
242 b0a6bcf7 2022-09-13 op /* Initialize a child */
243 b0a6bcf7 2022-09-13 op for (proc = 0; proc < nproc; proc++) {
244 b0a6bcf7 2022-09-13 op if (procs[proc].p_id != proc_id)
246 b0a6bcf7 2022-09-13 op p = &procs[proc];
249 b0a6bcf7 2022-09-13 op if (p == NULL || p->p_init == NULL)
250 b0a6bcf7 2022-09-13 op fatalx("%s: process %d missing process initialization",
251 b0a6bcf7 2022-09-13 op __func__, proc_id);
253 b0a6bcf7 2022-09-13 op p->p_init(ps, p);
255 b0a6bcf7 2022-09-13 op fatalx("failed to initiate child process");
259 b0a6bcf7 2022-09-13 op proc_accept(struct privsep *ps, int fd, enum privsep_procid dst,
260 b0a6bcf7 2022-09-13 op unsigned int n)
262 b0a6bcf7 2022-09-13 op struct privsep_pipes *pp = ps->ps_pp;
263 b0a6bcf7 2022-09-13 op struct imsgev *iev;
265 b0a6bcf7 2022-09-13 op if (ps->ps_ievs[dst] == NULL) {
266 b0a6bcf7 2022-09-13 op #if DEBUG > 1
267 b0a6bcf7 2022-09-13 op log_debug("%s: %s src %d %d to dst %d %d not connected",
268 b0a6bcf7 2022-09-13 op __func__, ps->ps_title[privsep_process],
269 b0a6bcf7 2022-09-13 op privsep_process, ps->ps_instance + 1,
276 b0a6bcf7 2022-09-13 op if (pp->pp_pipes[dst][n] != -1) {
277 b0a6bcf7 2022-09-13 op log_warnx("%s: duplicated descriptor", __func__);
281 b0a6bcf7 2022-09-13 op pp->pp_pipes[dst][n] = fd;
283 b0a6bcf7 2022-09-13 op iev = &ps->ps_ievs[dst][n];
284 b0a6bcf7 2022-09-13 op imsg_init(&iev->ibuf, fd);
285 b0a6bcf7 2022-09-13 op event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data);
286 b0a6bcf7 2022-09-13 op event_add(&iev->ev, NULL);
290 b0a6bcf7 2022-09-13 op proc_setup(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc)
292 b0a6bcf7 2022-09-13 op unsigned int i, j, src, dst, id;
293 b0a6bcf7 2022-09-13 op struct privsep_pipes *pp;
295 b0a6bcf7 2022-09-13 op /* Initialize parent title, ps_instances and procs. */
296 b0a6bcf7 2022-09-13 op ps->ps_title[PROC_PARENT] = "parent";
298 b0a6bcf7 2022-09-13 op for (src = 0; src < PROC_MAX; src++)
299 b0a6bcf7 2022-09-13 op /* Default to 1 process instance */
300 b0a6bcf7 2022-09-13 op if (ps->ps_instances[src] < 1)
301 b0a6bcf7 2022-09-13 op ps->ps_instances[src] = 1;
303 b0a6bcf7 2022-09-13 op for (src = 0; src < nproc; src++) {
304 b0a6bcf7 2022-09-13 op procs[src].p_ps = ps;
305 b0a6bcf7 2022-09-13 op if (procs[src].p_cb == NULL)
306 b0a6bcf7 2022-09-13 op procs[src].p_cb = proc_dispatch_null;
308 b0a6bcf7 2022-09-13 op id = procs[src].p_id;
309 b0a6bcf7 2022-09-13 op ps->ps_title[id] = procs[src].p_title;
310 b0a6bcf7 2022-09-13 op if ((ps->ps_ievs[id] = calloc(ps->ps_instances[id],
311 b0a6bcf7 2022-09-13 op sizeof(struct imsgev))) == NULL)
312 b0a6bcf7 2022-09-13 op fatal("%s: calloc", __func__);
314 b0a6bcf7 2022-09-13 op /* With this set up, we are ready to call imsg_init(). */
315 b0a6bcf7 2022-09-13 op for (i = 0; i < ps->ps_instances[id]; i++) {
316 b0a6bcf7 2022-09-13 op ps->ps_ievs[id][i].handler = proc_dispatch;
317 b0a6bcf7 2022-09-13 op ps->ps_ievs[id][i].events = EV_READ;
318 b0a6bcf7 2022-09-13 op ps->ps_ievs[id][i].proc = &procs[src];
319 b0a6bcf7 2022-09-13 op ps->ps_ievs[id][i].data = &ps->ps_ievs[id][i];
324 b0a6bcf7 2022-09-13 op * Allocate pipes for all process instances (incl. parent)
326 b0a6bcf7 2022-09-13 op * - ps->ps_pipes: N:M mapping
327 b0a6bcf7 2022-09-13 op * N source processes connected to M destination processes:
328 b0a6bcf7 2022-09-13 op * [src][instances][dst][instances], for example
329 b0a6bcf7 2022-09-13 op * [PROC_RELAY][3][PROC_CA][3]
331 b0a6bcf7 2022-09-13 op * - ps->ps_pp: per-process 1:M part of ps->ps_pipes
332 b0a6bcf7 2022-09-13 op * Each process instance has a destination array of socketpair fds:
333 b0a6bcf7 2022-09-13 op * [dst][instances], for example
334 b0a6bcf7 2022-09-13 op * [PROC_PARENT][0]
336 b0a6bcf7 2022-09-13 op for (src = 0; src < PROC_MAX; src++) {
337 b0a6bcf7 2022-09-13 op /* Allocate destination array for each process */
338 b0a6bcf7 2022-09-13 op if ((ps->ps_pipes[src] = calloc(ps->ps_instances[src],
339 b0a6bcf7 2022-09-13 op sizeof(struct privsep_pipes))) == NULL)
340 b0a6bcf7 2022-09-13 op fatal("%s: calloc", __func__);
342 b0a6bcf7 2022-09-13 op for (i = 0; i < ps->ps_instances[src]; i++) {
343 b0a6bcf7 2022-09-13 op pp = &ps->ps_pipes[src][i];
345 b0a6bcf7 2022-09-13 op for (dst = 0; dst < PROC_MAX; dst++) {
346 b0a6bcf7 2022-09-13 op /* Allocate maximum fd integers */
347 b0a6bcf7 2022-09-13 op if ((pp->pp_pipes[dst] =
348 b0a6bcf7 2022-09-13 op calloc(ps->ps_instances[dst],
349 b0a6bcf7 2022-09-13 op sizeof(int))) == NULL)
350 b0a6bcf7 2022-09-13 op fatal("%s: calloc", __func__);
352 b0a6bcf7 2022-09-13 op /* Mark fd as unused */
353 b0a6bcf7 2022-09-13 op for (j = 0; j < ps->ps_instances[dst]; j++)
354 b0a6bcf7 2022-09-13 op pp->pp_pipes[dst][j] = -1;
359 b0a6bcf7 2022-09-13 op ps->ps_pp = &ps->ps_pipes[privsep_process][ps->ps_instance];
363 b0a6bcf7 2022-09-13 op proc_kill(struct privsep *ps)
367 b0a6bcf7 2022-09-13 op int len, status;
369 b0a6bcf7 2022-09-13 op if (privsep_process != PROC_PARENT)
372 b0a6bcf7 2022-09-13 op proc_close(ps);
375 271704c0 2022-11-11 op pid = waitpid(WAIT_ANY, &status, 0);
376 b0a6bcf7 2022-09-13 op if (pid <= 0)
379 b0a6bcf7 2022-09-13 op if (WIFSIGNALED(status)) {
380 b0a6bcf7 2022-09-13 op len = asprintf(&cause, "terminated; signal %d",
381 b0a6bcf7 2022-09-13 op WTERMSIG(status));
382 b0a6bcf7 2022-09-13 op } else if (WIFEXITED(status)) {
383 b0a6bcf7 2022-09-13 op if (WEXITSTATUS(status) != 0)
384 b0a6bcf7 2022-09-13 op len = asprintf(&cause, "exited abnormally");
390 b0a6bcf7 2022-09-13 op if (len == 0) {
391 b0a6bcf7 2022-09-13 op /* child exited OK, don't print a warning message */
392 b0a6bcf7 2022-09-13 op } else if (len != -1) {
393 b0a6bcf7 2022-09-13 op log_warnx("lost child: pid %u %s", pid, cause);
396 b0a6bcf7 2022-09-13 op log_warnx("lost child: pid %u", pid);
397 b0a6bcf7 2022-09-13 op } while (pid != -1 || errno == EINTR);
401 b0a6bcf7 2022-09-13 op proc_open(struct privsep *ps, int src, int dst)
403 b0a6bcf7 2022-09-13 op struct privsep_pipes *pa, *pb;
404 b0a6bcf7 2022-09-13 op struct privsep_fd pf;
406 b0a6bcf7 2022-09-13 op unsigned int i, j;
408 b0a6bcf7 2022-09-13 op /* Exchange pipes between process. */
409 b0a6bcf7 2022-09-13 op for (i = 0; i < ps->ps_instances[src]; i++) {
410 b0a6bcf7 2022-09-13 op for (j = 0; j < ps->ps_instances[dst]; j++) {
411 b0a6bcf7 2022-09-13 op /* Don't create sockets for ourself. */
412 b0a6bcf7 2022-09-13 op if (src == dst && i == j)
415 b0a6bcf7 2022-09-13 op /* Proxies don't talk to each other. */
416 b0a6bcf7 2022-09-13 op if (src == PROC_PROXY && dst == PROC_PROXY)
419 b0a6bcf7 2022-09-13 op pa = &ps->ps_pipes[src][i];
420 b0a6bcf7 2022-09-13 op pb = &ps->ps_pipes[dst][j];
421 b0a6bcf7 2022-09-13 op if (socketpair(AF_UNIX,
422 b0a6bcf7 2022-09-13 op SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC,
423 b0a6bcf7 2022-09-13 op PF_UNSPEC, fds) == -1)
424 b0a6bcf7 2022-09-13 op fatal("%s: socketpair", __func__);
426 b0a6bcf7 2022-09-13 op pa->pp_pipes[dst][j] = fds[0];
427 b0a6bcf7 2022-09-13 op pb->pp_pipes[src][i] = fds[1];
429 b0a6bcf7 2022-09-13 op pf.pf_procid = src;
430 b0a6bcf7 2022-09-13 op pf.pf_instance = i;
431 b0a6bcf7 2022-09-13 op if (proc_compose_imsg(ps, dst, j, IMSG_CTL_PROCFD,
432 b0a6bcf7 2022-09-13 op -1, pb->pp_pipes[src][i], &pf, sizeof(pf)) == -1)
433 b0a6bcf7 2022-09-13 op fatal("%s: proc_compose_imsg", __func__);
435 b0a6bcf7 2022-09-13 op pf.pf_procid = dst;
436 b0a6bcf7 2022-09-13 op pf.pf_instance = j;
437 b0a6bcf7 2022-09-13 op if (proc_compose_imsg(ps, src, i, IMSG_CTL_PROCFD,
438 b0a6bcf7 2022-09-13 op -1, pa->pp_pipes[dst][j], &pf, sizeof(pf)) == -1)
439 b0a6bcf7 2022-09-13 op fatal("%s: proc_compose_imsg", __func__);
442 b0a6bcf7 2022-09-13 op * We have to flush to send the descriptors and close
443 b0a6bcf7 2022-09-13 op * them to avoid the fd ramp on startup.
445 b0a6bcf7 2022-09-13 op if (proc_flush_imsg(ps, src, i) == -1 ||
446 b0a6bcf7 2022-09-13 op proc_flush_imsg(ps, dst, j) == -1)
447 b0a6bcf7 2022-09-13 op fatal("%s: imsg_flush", __func__);
453 b0a6bcf7 2022-09-13 op proc_close(struct privsep *ps)
455 b0a6bcf7 2022-09-13 op unsigned int dst, n;
456 b0a6bcf7 2022-09-13 op struct privsep_pipes *pp;
458 b0a6bcf7 2022-09-13 op if (ps == NULL)
461 b0a6bcf7 2022-09-13 op pp = ps->ps_pp;
463 b0a6bcf7 2022-09-13 op for (dst = 0; dst < PROC_MAX; dst++) {
464 b0a6bcf7 2022-09-13 op if (ps->ps_ievs[dst] == NULL)
467 b0a6bcf7 2022-09-13 op for (n = 0; n < ps->ps_instances[dst]; n++) {
468 b0a6bcf7 2022-09-13 op if (pp->pp_pipes[dst][n] == -1)
471 b0a6bcf7 2022-09-13 op /* Cancel the fd, close and invalidate the fd */
472 b0a6bcf7 2022-09-13 op event_del(&(ps->ps_ievs[dst][n].ev));
473 b0a6bcf7 2022-09-13 op imsg_clear(&(ps->ps_ievs[dst][n].ibuf));
474 b0a6bcf7 2022-09-13 op close(pp->pp_pipes[dst][n]);
475 b0a6bcf7 2022-09-13 op pp->pp_pipes[dst][n] = -1;
477 b0a6bcf7 2022-09-13 op free(ps->ps_ievs[dst]);
482 b0a6bcf7 2022-09-13 op proc_shutdown(struct privsep_proc *p)
484 b0a6bcf7 2022-09-13 op struct privsep *ps = p->p_ps;
486 b0a6bcf7 2022-09-13 op if (p->p_shutdown != NULL)
487 b0a6bcf7 2022-09-13 op (*p->p_shutdown)();
489 b0a6bcf7 2022-09-13 op proc_close(ps);
491 b0a6bcf7 2022-09-13 op log_info("%s exiting, pid %d", p->p_title, getpid());
497 b0a6bcf7 2022-09-13 op proc_sig_handler(int sig, short event, void *arg)
499 b0a6bcf7 2022-09-13 op struct privsep_proc *p = arg;
501 b0a6bcf7 2022-09-13 op switch (sig) {
503 b0a6bcf7 2022-09-13 op case SIGTERM:
504 b0a6bcf7 2022-09-13 op proc_shutdown(p);
506 b0a6bcf7 2022-09-13 op case SIGCHLD:
511 b0a6bcf7 2022-09-13 op fatalx("%s: unexpected signal", __func__);
512 b0a6bcf7 2022-09-13 op /* NOTREACHED */
517 b0a6bcf7 2022-09-13 op proc_run(struct privsep *ps, struct privsep_proc *p,
518 b0a6bcf7 2022-09-13 op struct privsep_proc *procs, unsigned int nproc,
519 b0a6bcf7 2022-09-13 op void (*run)(struct privsep *, struct privsep_proc *, void *), void *arg)
521 b0a6bcf7 2022-09-13 op struct passwd *pw;
522 b0a6bcf7 2022-09-13 op const char *root;
524 b0a6bcf7 2022-09-13 op log_procinit(p->p_title);
526 b0a6bcf7 2022-09-13 op /* Set the process group of the current process */
527 b0a6bcf7 2022-09-13 op setpgid(0, 0);
529 b0a6bcf7 2022-09-13 op /* Use non-standard user */
530 b0a6bcf7 2022-09-13 op if (p->p_pw != NULL)
531 b0a6bcf7 2022-09-13 op pw = p->p_pw;
533 b0a6bcf7 2022-09-13 op pw = ps->ps_pw;
535 b0a6bcf7 2022-09-13 op /* Change root directory */
536 b0a6bcf7 2022-09-13 op if (p->p_chroot != NULL)
537 b0a6bcf7 2022-09-13 op root = p->p_chroot;
539 b0a6bcf7 2022-09-13 op root = pw->pw_dir;
541 b0a6bcf7 2022-09-13 op if (chroot(root) == -1)
542 b0a6bcf7 2022-09-13 op fatal("%s: chroot", __func__);
543 b0a6bcf7 2022-09-13 op if (chdir("/") == -1)
544 b0a6bcf7 2022-09-13 op fatal("%s: chdir(\"/\")", __func__);
546 b0a6bcf7 2022-09-13 op privsep_process = p->p_id;
548 b0a6bcf7 2022-09-13 op setproctitle("%s", p->p_title);
550 b0a6bcf7 2022-09-13 op if (setgroups(1, &pw->pw_gid) ||
551 b0a6bcf7 2022-09-13 op setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) ||
552 b0a6bcf7 2022-09-13 op setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid))
553 b0a6bcf7 2022-09-13 op fatal("%s: cannot drop privileges", __func__);
555 b0a6bcf7 2022-09-13 op event_init();
557 b0a6bcf7 2022-09-13 op signal(SIGPIPE, SIG_IGN);
559 b0a6bcf7 2022-09-13 op signal_set(&ps->ps_evsigint, SIGINT, proc_sig_handler, p);
560 b0a6bcf7 2022-09-13 op signal_set(&ps->ps_evsigterm, SIGTERM, proc_sig_handler, p);
561 b0a6bcf7 2022-09-13 op signal_set(&ps->ps_evsigchld, SIGCHLD, proc_sig_handler, p);
562 b0a6bcf7 2022-09-13 op signal_set(&ps->ps_evsighup, SIGHUP, proc_sig_handler, p);
564 b0a6bcf7 2022-09-13 op signal_add(&ps->ps_evsigint, NULL);
565 b0a6bcf7 2022-09-13 op signal_add(&ps->ps_evsigterm, NULL);
566 b0a6bcf7 2022-09-13 op signal_add(&ps->ps_evsigchld, NULL);
567 b0a6bcf7 2022-09-13 op signal_add(&ps->ps_evsighup, NULL);
569 b0a6bcf7 2022-09-13 op proc_setup(ps, procs, nproc);
570 b0a6bcf7 2022-09-13 op proc_accept(ps, PROC_PARENT_SOCK_FILENO, PROC_PARENT, 0);
572 b0a6bcf7 2022-09-13 op log_debug("%s: %s %d/%d, pid %d", __func__, p->p_title,
573 b0a6bcf7 2022-09-13 op ps->ps_instance + 1, ps->ps_instances[p->p_id], getpid());
575 b0a6bcf7 2022-09-13 op if (run != NULL)
576 b0a6bcf7 2022-09-13 op run(ps, p, arg);
578 b0a6bcf7 2022-09-13 op event_dispatch();
580 b0a6bcf7 2022-09-13 op proc_shutdown(p);
584 b0a6bcf7 2022-09-13 op proc_dispatch(int fd, short event, void *arg)
586 b0a6bcf7 2022-09-13 op struct imsgev *iev = arg;
587 b0a6bcf7 2022-09-13 op struct privsep_proc *p = iev->proc;
588 b0a6bcf7 2022-09-13 op struct privsep *ps = p->p_ps;
589 b0a6bcf7 2022-09-13 op struct imsgbuf *ibuf;
590 b0a6bcf7 2022-09-13 op struct imsg imsg;
592 b0a6bcf7 2022-09-13 op const char *title;
593 b0a6bcf7 2022-09-13 op struct privsep_fd pf;
595 b0a6bcf7 2022-09-13 op title = ps->ps_title[privsep_process];
596 b0a6bcf7 2022-09-13 op ibuf = &iev->ibuf;
598 b0a6bcf7 2022-09-13 op if (event & EV_READ) {
599 b0a6bcf7 2022-09-13 op if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
600 b0a6bcf7 2022-09-13 op fatal("%s: imsg_read", __func__);
601 b0a6bcf7 2022-09-13 op if (n == 0) {
602 b0a6bcf7 2022-09-13 op /* this pipe is dead, so remove the event handler */
603 b0a6bcf7 2022-09-13 op event_del(&iev->ev);
604 b0a6bcf7 2022-09-13 op event_loopexit(NULL);
609 b0a6bcf7 2022-09-13 op if (event & EV_WRITE) {
610 b0a6bcf7 2022-09-13 op if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN)
611 b0a6bcf7 2022-09-13 op fatal("%s: msgbuf_write", __func__);
612 b0a6bcf7 2022-09-13 op if (n == 0) {
613 b0a6bcf7 2022-09-13 op /* this pipe is dead, so remove the event handler */
614 b0a6bcf7 2022-09-13 op event_del(&iev->ev);
615 b0a6bcf7 2022-09-13 op event_loopexit(NULL);
621 b0a6bcf7 2022-09-13 op if ((n = imsg_get(ibuf, &imsg)) == -1)
622 b0a6bcf7 2022-09-13 op fatal("%s: imsg_get", __func__);
626 b0a6bcf7 2022-09-13 op #if DEBUG > 1
627 b0a6bcf7 2022-09-13 op log_debug("%s: %s %d got imsg %d peerid %d from %s %d",
628 b0a6bcf7 2022-09-13 op __func__, title, ps->ps_instance + 1,
629 b0a6bcf7 2022-09-13 op imsg.hdr.type, imsg.hdr.peerid, p->p_title, imsg.hdr.pid);
633 b0a6bcf7 2022-09-13 op * Check the message with the program callback
635 b0a6bcf7 2022-09-13 op if ((p->p_cb)(fd, p, &imsg) == 0) {
636 b0a6bcf7 2022-09-13 op /* Message was handled by the callback, continue */
637 b0a6bcf7 2022-09-13 op imsg_free(&imsg);
642 b0a6bcf7 2022-09-13 op * Generic message handling
644 b0a6bcf7 2022-09-13 op switch (imsg.hdr.type) {
645 b0a6bcf7 2022-09-13 op case IMSG_CTL_PROCFD:
646 b0a6bcf7 2022-09-13 op IMSG_SIZE_CHECK(&imsg, &pf);
647 b0a6bcf7 2022-09-13 op memcpy(&pf, imsg.data, sizeof(pf));
648 b0a6bcf7 2022-09-13 op proc_accept(ps, imsg.fd, pf.pf_procid,
649 b0a6bcf7 2022-09-13 op pf.pf_instance);
652 b0a6bcf7 2022-09-13 op fatalx("%s: %s %d got invalid imsg %d peerid %d "
653 b0a6bcf7 2022-09-13 op "from %s %d",
654 b0a6bcf7 2022-09-13 op __func__, title, ps->ps_instance + 1,
655 b0a6bcf7 2022-09-13 op imsg.hdr.type, imsg.hdr.peerid,
656 b0a6bcf7 2022-09-13 op p->p_title, imsg.hdr.pid);
658 b0a6bcf7 2022-09-13 op imsg_free(&imsg);
660 b0a6bcf7 2022-09-13 op imsg_event_add(iev);
664 b0a6bcf7 2022-09-13 op proc_dispatch_null(int fd, struct privsep_proc *p, struct imsg *imsg)
670 b0a6bcf7 2022-09-13 op * imsg helper functions
674 b0a6bcf7 2022-09-13 op imsg_event_add(struct imsgev *iev)
676 b0a6bcf7 2022-09-13 op if (iev->handler == NULL) {
677 b0a6bcf7 2022-09-13 op imsg_flush(&iev->ibuf);
681 b0a6bcf7 2022-09-13 op iev->events = EV_READ;
682 b0a6bcf7 2022-09-13 op if (iev->ibuf.w.queued)
683 b0a6bcf7 2022-09-13 op iev->events |= EV_WRITE;
685 b0a6bcf7 2022-09-13 op event_del(&iev->ev);
686 b0a6bcf7 2022-09-13 op event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data);
687 b0a6bcf7 2022-09-13 op event_add(&iev->ev, NULL);
691 b0a6bcf7 2022-09-13 op imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
692 b0a6bcf7 2022-09-13 op pid_t pid, int fd, void *data, uint16_t datalen)
696 b0a6bcf7 2022-09-13 op if ((ret = imsg_compose(&iev->ibuf, type, peerid,
697 b0a6bcf7 2022-09-13 op pid, fd, data, datalen)) == -1)
698 b0a6bcf7 2022-09-13 op return (ret);
699 b0a6bcf7 2022-09-13 op imsg_event_add(iev);
700 b0a6bcf7 2022-09-13 op return (ret);
704 b0a6bcf7 2022-09-13 op imsg_composev_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
705 b0a6bcf7 2022-09-13 op pid_t pid, int fd, const struct iovec *iov, int iovcnt)
709 b0a6bcf7 2022-09-13 op if ((ret = imsg_composev(&iev->ibuf, type, peerid,
710 b0a6bcf7 2022-09-13 op pid, fd, iov, iovcnt)) == -1)
711 b0a6bcf7 2022-09-13 op return (ret);
712 b0a6bcf7 2022-09-13 op imsg_event_add(iev);
713 b0a6bcf7 2022-09-13 op return (ret);
717 b0a6bcf7 2022-09-13 op proc_range(struct privsep *ps, enum privsep_procid id, int *n, int *m)
719 b0a6bcf7 2022-09-13 op if (*n == -1) {
720 b0a6bcf7 2022-09-13 op /* Use a range of all target instances */
722 b0a6bcf7 2022-09-13 op *m = ps->ps_instances[id];
724 b0a6bcf7 2022-09-13 op /* Use only a single slot of the specified peer process */
730 b0a6bcf7 2022-09-13 op proc_compose_imsg(struct privsep *ps, enum privsep_procid id, int n,
731 b0a6bcf7 2022-09-13 op uint16_t type, uint32_t peerid, int fd, void *data, uint16_t datalen)
735 b0a6bcf7 2022-09-13 op proc_range(ps, id, &n, &m);
736 b0a6bcf7 2022-09-13 op for (; n < m; n++) {
737 b0a6bcf7 2022-09-13 op if (imsg_compose_event(&ps->ps_ievs[id][n],
738 b0a6bcf7 2022-09-13 op type, peerid, ps->ps_instance + 1, fd, data, datalen) == -1)
746 b0a6bcf7 2022-09-13 op proc_compose(struct privsep *ps, enum privsep_procid id,
747 b0a6bcf7 2022-09-13 op uint16_t type, void *data, uint16_t datalen)
749 b0a6bcf7 2022-09-13 op return (proc_compose_imsg(ps, id, -1, type, -1, -1, data, datalen));
753 b0a6bcf7 2022-09-13 op proc_composev_imsg(struct privsep *ps, enum privsep_procid id, int n,
754 b0a6bcf7 2022-09-13 op uint16_t type, uint32_t peerid, int fd, const struct iovec *iov, int iovcnt)
758 b0a6bcf7 2022-09-13 op proc_range(ps, id, &n, &m);
759 b0a6bcf7 2022-09-13 op for (; n < m; n++)
760 b0a6bcf7 2022-09-13 op if (imsg_composev_event(&ps->ps_ievs[id][n],
761 b0a6bcf7 2022-09-13 op type, peerid, ps->ps_instance + 1, fd, iov, iovcnt) == -1)
768 b0a6bcf7 2022-09-13 op proc_composev(struct privsep *ps, enum privsep_procid id,
769 b0a6bcf7 2022-09-13 op uint16_t type, const struct iovec *iov, int iovcnt)
771 b0a6bcf7 2022-09-13 op return (proc_composev_imsg(ps, id, -1, type, -1, -1, iov, iovcnt));
775 b0a6bcf7 2022-09-13 op proc_forward_imsg(struct privsep *ps, struct imsg *imsg,
776 b0a6bcf7 2022-09-13 op enum privsep_procid id, int n)
778 b0a6bcf7 2022-09-13 op return (proc_compose_imsg(ps, id, n, imsg->hdr.type,
779 b0a6bcf7 2022-09-13 op imsg->hdr.peerid, imsg->fd, imsg->data, IMSG_DATA_SIZE(imsg)));
782 b0a6bcf7 2022-09-13 op struct imsgbuf *
783 b0a6bcf7 2022-09-13 op proc_ibuf(struct privsep *ps, enum privsep_procid id, int n)
787 b0a6bcf7 2022-09-13 op proc_range(ps, id, &n, &m);
788 b0a6bcf7 2022-09-13 op return (&ps->ps_ievs[id][n].ibuf);
791 b0a6bcf7 2022-09-13 op struct imsgev *
792 b0a6bcf7 2022-09-13 op proc_iev(struct privsep *ps, enum privsep_procid id, int n)
796 b0a6bcf7 2022-09-13 op proc_range(ps, id, &n, &m);
797 b0a6bcf7 2022-09-13 op return (&ps->ps_ievs[id][n]);
800 b0a6bcf7 2022-09-13 op /* This function should only be called with care as it breaks async I/O */
802 b0a6bcf7 2022-09-13 op proc_flush_imsg(struct privsep *ps, enum privsep_procid id, int n)
804 b0a6bcf7 2022-09-13 op struct imsgbuf *ibuf;
805 b0a6bcf7 2022-09-13 op int m, ret = 0;
807 b0a6bcf7 2022-09-13 op proc_range(ps, id, &n, &m);
808 b0a6bcf7 2022-09-13 op for (; n < m; n++) {
809 b0a6bcf7 2022-09-13 op if ((ibuf = proc_ibuf(ps, id, n)) == NULL)
812 b0a6bcf7 2022-09-13 op ret = imsg_flush(ibuf);
813 b0a6bcf7 2022-09-13 op } while (ret == -1 && errno == EAGAIN);
814 b0a6bcf7 2022-09-13 op if (ret == -1)
816 b0a6bcf7 2022-09-13 op imsg_event_add(&ps->ps_ievs[id][n]);
819 b0a6bcf7 2022-09-13 op return (ret);