1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
29 #include <sys/socket.h>
31 #include <sys/prctl.h>
32 #include <linux/sched.h>
33 #include <sys/types.h>
37 #include <sys/mount.h>
39 #include <linux/oom.h>
42 #include <sys/personality.h>
47 #include <security/pam_appl.h>
51 #include <selinux/selinux.h>
59 #include <sys/apparmor.h>
65 #include "capability.h"
68 #include "sd-messages.h"
70 #include "securebits.h"
71 #include "namespace.h"
72 #include "exit-status.h"
74 #include "utmp-wtmp.h"
76 #include "path-util.h"
81 #include "selinux-util.h"
82 #include "errno-list.h"
85 #include "apparmor-util.h"
88 #include "seccomp-util.h"
91 #define IDLE_TIMEOUT_USEC (5*USEC_PER_SEC)
92 #define IDLE_TIMEOUT2_USEC (1*USEC_PER_SEC)
94 /* This assumes there is a 'tty' group */
97 #define SNDBUF_SIZE (8*1024*1024)
99 static int shift_fds(int fds[], unsigned n_fds) {
100 int start, restart_from;
105 /* Modifies the fds array! (sorts it) */
115 for (i = start; i < (int) n_fds; i++) {
118 /* Already at right index? */
122 if ((nfd = fcntl(fds[i], F_DUPFD, i+3)) < 0)
128 /* Hmm, the fd we wanted isn't free? Then
129 * let's remember that and try again from here*/
130 if (nfd != i+3 && restart_from < 0)
134 if (restart_from < 0)
137 start = restart_from;
143 static int flags_fds(const int fds[], unsigned n_fds, bool nonblock) {
152 /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */
154 for (i = 0; i < n_fds; i++) {
156 if ((r = fd_nonblock(fds[i], nonblock)) < 0)
159 /* We unconditionally drop FD_CLOEXEC from the fds,
160 * since after all we want to pass these fds to our
163 if ((r = fd_cloexec(fds[i], false)) < 0)
170 _pure_ static const char *tty_path(const ExecContext *context) {
173 if (context->tty_path)
174 return context->tty_path;
176 return "/dev/console";
179 static void exec_context_tty_reset(const ExecContext *context) {
182 if (context->tty_vhangup)
183 terminal_vhangup(tty_path(context));
185 if (context->tty_reset)
186 reset_terminal(tty_path(context));
188 if (context->tty_vt_disallocate && context->tty_path)
189 vt_disallocate(context->tty_path);
192 static bool is_terminal_output(ExecOutput o) {
194 o == EXEC_OUTPUT_TTY ||
195 o == EXEC_OUTPUT_SYSLOG_AND_CONSOLE ||
196 o == EXEC_OUTPUT_KMSG_AND_CONSOLE ||
197 o == EXEC_OUTPUT_JOURNAL_AND_CONSOLE;
200 static int open_null_as(int flags, int nfd) {
205 fd = open("/dev/null", flags|O_NOCTTY);
210 r = dup2(fd, nfd) < 0 ? -errno : nfd;
218 static int connect_logger_as(const ExecContext *context, ExecOutput output, const char *ident, const char *unit_id, int nfd) {
220 union sockaddr_union sa = {
221 .un.sun_family = AF_UNIX,
222 .un.sun_path = "/run/systemd/journal/stdout",
226 assert(output < _EXEC_OUTPUT_MAX);
230 fd = socket(AF_UNIX, SOCK_STREAM, 0);
234 r = connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path));
240 if (shutdown(fd, SHUT_RD) < 0) {
245 fd_inc_sndbuf(fd, SNDBUF_SIZE);
255 context->syslog_identifier ? context->syslog_identifier : ident,
257 context->syslog_priority,
258 !!context->syslog_level_prefix,
259 output == EXEC_OUTPUT_SYSLOG || output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE,
260 output == EXEC_OUTPUT_KMSG || output == EXEC_OUTPUT_KMSG_AND_CONSOLE,
261 is_terminal_output(output));
264 r = dup2(fd, nfd) < 0 ? -errno : nfd;
271 static int open_terminal_as(const char *path, mode_t mode, int nfd) {
277 if ((fd = open_terminal(path, mode | O_NOCTTY)) < 0)
281 r = dup2(fd, nfd) < 0 ? -errno : nfd;
289 static bool is_terminal_input(ExecInput i) {
291 i == EXEC_INPUT_TTY ||
292 i == EXEC_INPUT_TTY_FORCE ||
293 i == EXEC_INPUT_TTY_FAIL;
296 static int fixup_input(ExecInput std_input, int socket_fd, bool apply_tty_stdin) {
298 if (is_terminal_input(std_input) && !apply_tty_stdin)
299 return EXEC_INPUT_NULL;
301 if (std_input == EXEC_INPUT_SOCKET && socket_fd < 0)
302 return EXEC_INPUT_NULL;
307 static int fixup_output(ExecOutput std_output, int socket_fd) {
309 if (std_output == EXEC_OUTPUT_SOCKET && socket_fd < 0)
310 return EXEC_OUTPUT_INHERIT;
315 static int setup_input(const ExecContext *context, int socket_fd, bool apply_tty_stdin) {
320 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
324 case EXEC_INPUT_NULL:
325 return open_null_as(O_RDONLY, STDIN_FILENO);
328 case EXEC_INPUT_TTY_FORCE:
329 case EXEC_INPUT_TTY_FAIL: {
332 fd = acquire_terminal(tty_path(context),
333 i == EXEC_INPUT_TTY_FAIL,
334 i == EXEC_INPUT_TTY_FORCE,
340 if (fd != STDIN_FILENO) {
341 r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
349 case EXEC_INPUT_SOCKET:
350 return dup2(socket_fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
353 assert_not_reached("Unknown input type");
357 static int setup_output(const ExecContext *context, int fileno, int socket_fd, const char *ident, const char *unit_id, bool apply_tty_stdin) {
365 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
366 o = fixup_output(context->std_output, socket_fd);
368 if (fileno == STDERR_FILENO) {
370 e = fixup_output(context->std_error, socket_fd);
372 /* This expects the input and output are already set up */
374 /* Don't change the stderr file descriptor if we inherit all
375 * the way and are not on a tty */
376 if (e == EXEC_OUTPUT_INHERIT &&
377 o == EXEC_OUTPUT_INHERIT &&
378 i == EXEC_INPUT_NULL &&
379 !is_terminal_input(context->std_input) &&
383 /* Duplicate from stdout if possible */
384 if (e == o || e == EXEC_OUTPUT_INHERIT)
385 return dup2(STDOUT_FILENO, fileno) < 0 ? -errno : fileno;
389 } else if (o == EXEC_OUTPUT_INHERIT) {
390 /* If input got downgraded, inherit the original value */
391 if (i == EXEC_INPUT_NULL && is_terminal_input(context->std_input))
392 return open_terminal_as(tty_path(context), O_WRONLY, fileno);
394 /* If the input is connected to anything that's not a /dev/null, inherit that... */
395 if (i != EXEC_INPUT_NULL)
396 return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno;
398 /* If we are not started from PID 1 we just inherit STDOUT from our parent process. */
402 /* We need to open /dev/null here anew, to get the right access mode. */
403 return open_null_as(O_WRONLY, fileno);
408 case EXEC_OUTPUT_NULL:
409 return open_null_as(O_WRONLY, fileno);
411 case EXEC_OUTPUT_TTY:
412 if (is_terminal_input(i))
413 return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno;
415 /* We don't reset the terminal if this is just about output */
416 return open_terminal_as(tty_path(context), O_WRONLY, fileno);
418 case EXEC_OUTPUT_SYSLOG:
419 case EXEC_OUTPUT_SYSLOG_AND_CONSOLE:
420 case EXEC_OUTPUT_KMSG:
421 case EXEC_OUTPUT_KMSG_AND_CONSOLE:
422 case EXEC_OUTPUT_JOURNAL:
423 case EXEC_OUTPUT_JOURNAL_AND_CONSOLE:
424 r = connect_logger_as(context, o, ident, unit_id, fileno);
426 log_struct_unit(LOG_CRIT, unit_id,
427 "MESSAGE=Failed to connect std%s of %s to the journal socket: %s",
428 fileno == STDOUT_FILENO ? "out" : "err",
429 unit_id, strerror(-r),
432 r = open_null_as(O_WRONLY, fileno);
436 case EXEC_OUTPUT_SOCKET:
437 assert(socket_fd >= 0);
438 return dup2(socket_fd, fileno) < 0 ? -errno : fileno;
441 assert_not_reached("Unknown error type");
445 static int chown_terminal(int fd, uid_t uid) {
450 /* This might fail. What matters are the results. */
451 (void) fchown(fd, uid, -1);
452 (void) fchmod(fd, TTY_MODE);
454 if (fstat(fd, &st) < 0)
457 if (st.st_uid != uid || (st.st_mode & 0777) != TTY_MODE)
463 static int setup_confirm_stdio(int *_saved_stdin,
464 int *_saved_stdout) {
465 int fd = -1, saved_stdin, saved_stdout = -1, r;
467 assert(_saved_stdin);
468 assert(_saved_stdout);
470 saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3);
474 saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3);
475 if (saved_stdout < 0) {
480 fd = acquire_terminal(
485 DEFAULT_CONFIRM_USEC);
491 r = chown_terminal(fd, getuid());
495 if (dup2(fd, STDIN_FILENO) < 0) {
500 if (dup2(fd, STDOUT_FILENO) < 0) {
508 *_saved_stdin = saved_stdin;
509 *_saved_stdout = saved_stdout;
514 safe_close(saved_stdout);
515 safe_close(saved_stdin);
521 _printf_(1, 2) static int write_confirm_message(const char *format, ...) {
522 _cleanup_close_ int fd = -1;
527 fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
531 va_start(ap, format);
532 vdprintf(fd, format, ap);
538 static int restore_confirm_stdio(int *saved_stdin,
544 assert(saved_stdout);
548 if (*saved_stdin >= 0)
549 if (dup2(*saved_stdin, STDIN_FILENO) < 0)
552 if (*saved_stdout >= 0)
553 if (dup2(*saved_stdout, STDOUT_FILENO) < 0)
556 safe_close(*saved_stdin);
557 safe_close(*saved_stdout);
562 static int ask_for_confirmation(char *response, char **argv) {
563 int saved_stdout = -1, saved_stdin = -1, r;
566 r = setup_confirm_stdio(&saved_stdin, &saved_stdout);
570 line = exec_command_line(argv);
574 r = ask(response, "yns", "Execute %s? [Yes, No, Skip] ", line);
577 restore_confirm_stdio(&saved_stdin, &saved_stdout);
582 static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) {
583 bool keep_groups = false;
588 /* Lookup and set GID and supplementary group list. Here too
589 * we avoid NSS lookups for gid=0. */
591 if (context->group || username) {
593 if (context->group) {
594 const char *g = context->group;
596 if ((r = get_group_creds(&g, &gid)) < 0)
600 /* First step, initialize groups from /etc/groups */
601 if (username && gid != 0) {
602 if (initgroups(username, gid) < 0)
608 /* Second step, set our gids */
609 if (setresgid(gid, gid, gid) < 0)
613 if (context->supplementary_groups) {
618 /* Final step, initialize any manually set supplementary groups */
619 assert_se((ngroups_max = (int) sysconf(_SC_NGROUPS_MAX)) > 0);
621 if (!(gids = new(gid_t, ngroups_max)))
625 if ((k = getgroups(ngroups_max, gids)) < 0) {
632 STRV_FOREACH(i, context->supplementary_groups) {
635 if (k >= ngroups_max) {
641 r = get_group_creds(&g, gids+k);
650 if (setgroups(k, gids) < 0) {
661 static int enforce_user(const ExecContext *context, uid_t uid) {
664 /* Sets (but doesn't lookup) the uid and make sure we keep the
665 * capabilities while doing so. */
667 if (context->capabilities) {
668 _cleanup_cap_free_ cap_t d = NULL;
669 static const cap_value_t bits[] = {
670 CAP_SETUID, /* Necessary so that we can run setresuid() below */
671 CAP_SETPCAP /* Necessary so that we can set PR_SET_SECUREBITS later on */
674 /* First step: If we need to keep capabilities but
675 * drop privileges we need to make sure we keep our
676 * caps, while we drop privileges. */
678 int sb = context->secure_bits | 1<<SECURE_KEEP_CAPS;
680 if (prctl(PR_GET_SECUREBITS) != sb)
681 if (prctl(PR_SET_SECUREBITS, sb) < 0)
685 /* Second step: set the capabilities. This will reduce
686 * the capabilities to the minimum we need. */
688 d = cap_dup(context->capabilities);
692 if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 ||
693 cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0)
696 if (cap_set_proc(d) < 0)
700 /* Third step: actually set the uids */
701 if (setresuid(uid, uid, uid) < 0)
704 /* At this point we should have all necessary capabilities but
705 are otherwise a normal user. However, the caps might got
706 corrupted due to the setresuid() so we need clean them up
707 later. This is done outside of this call. */
714 static int null_conv(
716 const struct pam_message **msg,
717 struct pam_response **resp,
720 /* We don't support conversations */
725 static int setup_pam(
731 int fds[], unsigned n_fds) {
733 static const struct pam_conv conv = {
738 pam_handle_t *handle = NULL;
740 int pam_code = PAM_SUCCESS;
743 bool close_session = false;
744 pid_t pam_pid = 0, parent_pid;
751 /* We set up PAM in the parent process, then fork. The child
752 * will then stay around until killed via PR_GET_PDEATHSIG or
753 * systemd via the cgroup logic. It will then remove the PAM
754 * session again. The parent process will exec() the actual
755 * daemon. We do things this way to ensure that the main PID
756 * of the daemon is the one we initially fork()ed. */
758 if (log_get_max_level() < LOG_PRI(LOG_DEBUG))
761 pam_code = pam_start(name, user, &conv, &handle);
762 if (pam_code != PAM_SUCCESS) {
768 pam_code = pam_set_item(handle, PAM_TTY, tty);
769 if (pam_code != PAM_SUCCESS)
773 pam_code = pam_acct_mgmt(handle, flags);
774 if (pam_code != PAM_SUCCESS)
777 pam_code = pam_open_session(handle, flags);
778 if (pam_code != PAM_SUCCESS)
781 close_session = true;
783 e = pam_getenvlist(handle);
785 pam_code = PAM_BUF_ERR;
789 /* Block SIGTERM, so that we know that it won't get lost in
791 if (sigemptyset(&ss) < 0 ||
792 sigaddset(&ss, SIGTERM) < 0 ||
793 sigprocmask(SIG_BLOCK, &ss, &old_ss) < 0)
796 parent_pid = getpid();
806 /* The child's job is to reset the PAM session on
809 /* This string must fit in 10 chars (i.e. the length
810 * of "/sbin/init"), to look pretty in /bin/ps */
811 rename_process("(sd-pam)");
813 /* Make sure we don't keep open the passed fds in this
814 child. We assume that otherwise only those fds are
815 open here that have been opened by PAM. */
816 close_many(fds, n_fds);
818 /* Drop privileges - we don't need any to pam_close_session
819 * and this will make PR_SET_PDEATHSIG work in most cases.
820 * If this fails, ignore the error - but expect sd-pam threads
821 * to fail to exit normally */
822 if (setresuid(uid, uid, uid) < 0)
823 log_error("Error: Failed to setresuid() in sd-pam: %s", strerror(-r));
825 /* Wait until our parent died. This will only work if
826 * the above setresuid() succeeds, otherwise the kernel
827 * will not allow unprivileged parents kill their privileged
828 * children this way. We rely on the control groups kill logic
829 * to do the rest for us. */
830 if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
833 /* Check if our parent process might already have
835 if (getppid() == parent_pid) {
837 if (sigwait(&ss, &sig) < 0) {
844 assert(sig == SIGTERM);
849 /* If our parent died we'll end the session */
850 if (getppid() != parent_pid) {
851 pam_code = pam_close_session(handle, flags);
852 if (pam_code != PAM_SUCCESS)
859 pam_end(handle, pam_code | flags);
863 /* If the child was forked off successfully it will do all the
864 * cleanups, so forget about the handle here. */
867 /* Unblock SIGTERM again in the parent */
868 if (sigprocmask(SIG_SETMASK, &old_ss, NULL) < 0)
871 /* We close the log explicitly here, since the PAM modules
872 * might have opened it, but we don't want this fd around. */
881 if (pam_code != PAM_SUCCESS) {
882 log_error("PAM failed: %s", pam_strerror(handle, pam_code));
883 err = -EPERM; /* PAM errors do not map to errno */
885 log_error("PAM failed: %m");
891 pam_code = pam_close_session(handle, flags);
893 pam_end(handle, pam_code | flags);
901 kill(pam_pid, SIGTERM);
902 kill(pam_pid, SIGCONT);
909 static void rename_process_from_path(const char *path) {
910 char process_name[11];
914 /* This resulting string must fit in 10 chars (i.e. the length
915 * of "/sbin/init") to look pretty in /bin/ps */
919 rename_process("(...)");
925 /* The end of the process name is usually more
926 * interesting, since the first bit might just be
932 process_name[0] = '(';
933 memcpy(process_name+1, p, l);
934 process_name[1+l] = ')';
935 process_name[1+l+1] = 0;
937 rename_process(process_name);
942 static int apply_seccomp(ExecContext *c) {
943 uint32_t negative_action, action;
944 scmp_filter_ctx *seccomp;
951 negative_action = c->syscall_errno == 0 ? SCMP_ACT_KILL : SCMP_ACT_ERRNO(c->syscall_errno);
953 seccomp = seccomp_init(c->syscall_whitelist ? negative_action : SCMP_ACT_ALLOW);
957 if (c->syscall_archs) {
959 SET_FOREACH(id, c->syscall_archs, i) {
960 r = seccomp_arch_add(seccomp, PTR_TO_UINT32(id) - 1);
968 r = seccomp_add_secondary_archs(seccomp);
973 action = c->syscall_whitelist ? SCMP_ACT_ALLOW : negative_action;
974 SET_FOREACH(id, c->syscall_filter, i) {
975 r = seccomp_rule_add(seccomp, action, PTR_TO_INT(id) - 1, 0);
980 r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
984 r = seccomp_load(seccomp);
987 seccomp_release(seccomp);
991 static int apply_address_families(ExecContext *c) {
992 scmp_filter_ctx *seccomp;
998 seccomp = seccomp_init(SCMP_ACT_ALLOW);
1002 r = seccomp_add_secondary_archs(seccomp);
1006 if (c->address_families_whitelist) {
1007 int af, first = 0, last = 0;
1010 /* If this is a whitelist, we first block the address
1011 * families that are out of range and then everything
1012 * that is not in the set. First, we find the lowest
1013 * and highest address family in the set. */
1015 SET_FOREACH(afp, c->address_families, i) {
1016 af = PTR_TO_INT(afp);
1018 if (af <= 0 || af >= af_max())
1021 if (first == 0 || af < first)
1024 if (last == 0 || af > last)
1028 assert((first == 0) == (last == 0));
1032 /* No entries in the valid range, block everything */
1033 r = seccomp_rule_add(
1035 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1043 /* Block everything below the first entry */
1044 r = seccomp_rule_add(
1046 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1049 SCMP_A0(SCMP_CMP_LT, first));
1053 /* Block everything above the last entry */
1054 r = seccomp_rule_add(
1056 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1059 SCMP_A0(SCMP_CMP_GT, last));
1063 /* Block everything between the first and last
1065 for (af = 1; af < af_max(); af++) {
1067 if (set_contains(c->address_families, INT_TO_PTR(af)))
1070 r = seccomp_rule_add(
1072 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1075 SCMP_A0(SCMP_CMP_EQ, af));
1084 /* If this is a blacklist, then generate one rule for
1085 * each address family that are then combined in OR
1088 SET_FOREACH(af, c->address_families, i) {
1090 r = seccomp_rule_add(
1092 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1095 SCMP_A0(SCMP_CMP_EQ, PTR_TO_INT(af)));
1101 r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
1105 r = seccomp_load(seccomp);
1108 seccomp_release(seccomp);
1114 static void do_idle_pipe_dance(int idle_pipe[4]) {
1118 safe_close(idle_pipe[1]);
1119 safe_close(idle_pipe[2]);
1121 if (idle_pipe[0] >= 0) {
1124 r = fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT_USEC);
1126 if (idle_pipe[3] >= 0 && r == 0 /* timeout */) {
1127 /* Signal systemd that we are bored and want to continue. */
1128 write(idle_pipe[3], "x", 1);
1130 /* Wait for systemd to react to the signal above. */
1131 fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT2_USEC);
1134 safe_close(idle_pipe[0]);
1138 safe_close(idle_pipe[3]);
1141 static int build_environment(
1144 usec_t watchdog_usec,
1146 const char *username,
1150 _cleanup_strv_free_ char **our_env = NULL;
1157 our_env = new0(char*, 10);
1162 if (asprintf(&x, "LISTEN_PID="PID_FMT, getpid()) < 0)
1164 our_env[n_env++] = x;
1166 if (asprintf(&x, "LISTEN_FDS=%u", n_fds) < 0)
1168 our_env[n_env++] = x;
1171 if (watchdog_usec > 0) {
1172 if (asprintf(&x, "WATCHDOG_PID="PID_FMT, getpid()) < 0)
1174 our_env[n_env++] = x;
1176 if (asprintf(&x, "WATCHDOG_USEC="USEC_FMT, watchdog_usec) < 0)
1178 our_env[n_env++] = x;
1182 x = strappend("HOME=", home);
1185 our_env[n_env++] = x;
1189 x = strappend("LOGNAME=", username);
1192 our_env[n_env++] = x;
1194 x = strappend("USER=", username);
1197 our_env[n_env++] = x;
1201 x = strappend("SHELL=", shell);
1204 our_env[n_env++] = x;
1207 if (is_terminal_input(c->std_input) ||
1208 c->std_output == EXEC_OUTPUT_TTY ||
1209 c->std_error == EXEC_OUTPUT_TTY ||
1212 x = strdup(default_term_for_tty(tty_path(c)));
1215 our_env[n_env++] = x;
1218 our_env[n_env++] = NULL;
1219 assert(n_env <= 10);
1227 int exec_spawn(ExecCommand *command,
1229 ExecContext *context,
1230 int fds[], unsigned n_fds,
1232 bool apply_permissions,
1234 bool apply_tty_stdin,
1236 CGroupControllerMask cgroup_supported,
1237 const char *cgroup_path,
1238 const char *runtime_prefix,
1239 const char *unit_id,
1240 usec_t watchdog_usec,
1242 ExecRuntime *runtime,
1245 _cleanup_strv_free_ char **files_env = NULL;
1254 assert(fds || n_fds <= 0);
1256 if (context->std_input == EXEC_INPUT_SOCKET ||
1257 context->std_output == EXEC_OUTPUT_SOCKET ||
1258 context->std_error == EXEC_OUTPUT_SOCKET) {
1270 r = exec_context_load_environment(context, &files_env);
1272 log_struct_unit(LOG_ERR,
1274 "MESSAGE=Failed to load environment files: %s", strerror(-r),
1281 argv = command->argv;
1283 line = exec_command_line(argv);
1287 log_struct_unit(LOG_DEBUG,
1289 "EXECUTABLE=%s", command->path,
1290 "MESSAGE=About to execute: %s", line,
1299 _cleanup_strv_free_ char **our_env = NULL, **pam_env = NULL, **final_env = NULL, **final_argv = NULL;
1300 const char *username = NULL, *home = NULL, *shell = NULL;
1301 unsigned n_dont_close = 0;
1302 int dont_close[n_fds + 3];
1303 uid_t uid = (uid_t) -1;
1304 gid_t gid = (gid_t) -1;
1310 rename_process_from_path(command->path);
1312 /* We reset exactly these signals, since they are the
1313 * only ones we set to SIG_IGN in the main daemon. All
1314 * others we leave untouched because we set them to
1315 * SIG_DFL or a valid handler initially, both of which
1316 * will be demoted to SIG_DFL. */
1317 default_signals(SIGNALS_CRASH_HANDLER,
1318 SIGNALS_IGNORE, -1);
1320 if (context->ignore_sigpipe)
1321 ignore_signals(SIGPIPE, -1);
1323 assert_se(sigemptyset(&ss) == 0);
1324 if (sigprocmask(SIG_SETMASK, &ss, NULL) < 0) {
1326 r = EXIT_SIGNAL_MASK;
1331 do_idle_pipe_dance(idle_pipe);
1333 /* Close sockets very early to make sure we don't
1334 * block init reexecution because it cannot bind its
1339 dont_close[n_dont_close++] = socket_fd;
1341 memcpy(dont_close + n_dont_close, fds, sizeof(int) * n_fds);
1342 n_dont_close += n_fds;
1345 if (runtime->netns_storage_socket[0] >= 0)
1346 dont_close[n_dont_close++] = runtime->netns_storage_socket[0];
1347 if (runtime->netns_storage_socket[1] >= 0)
1348 dont_close[n_dont_close++] = runtime->netns_storage_socket[1];
1351 err = close_all_fds(dont_close, n_dont_close);
1357 if (!context->same_pgrp)
1364 exec_context_tty_reset(context);
1366 if (confirm_spawn) {
1369 err = ask_for_confirmation(&response, argv);
1370 if (err == -ETIMEDOUT)
1371 write_confirm_message("Confirmation question timed out, assuming positive response.\n");
1373 write_confirm_message("Couldn't ask confirmation question, assuming positive response: %s\n", strerror(-err));
1374 else if (response == 's') {
1375 write_confirm_message("Skipping execution.\n");
1379 } else if (response == 'n') {
1380 write_confirm_message("Failing execution.\n");
1386 /* If a socket is connected to STDIN/STDOUT/STDERR, we
1387 * must sure to drop O_NONBLOCK */
1389 fd_nonblock(socket_fd, false);
1391 err = setup_input(context, socket_fd, apply_tty_stdin);
1397 err = setup_output(context, STDOUT_FILENO, socket_fd, basename(command->path), unit_id, apply_tty_stdin);
1403 err = setup_output(context, STDERR_FILENO, socket_fd, basename(command->path), unit_id, apply_tty_stdin);
1410 err = cg_attach_everywhere(cgroup_supported, cgroup_path, 0);
1417 if (context->oom_score_adjust_set) {
1420 snprintf(t, sizeof(t), "%i", context->oom_score_adjust);
1423 if (write_string_file("/proc/self/oom_score_adj", t) < 0) {
1425 r = EXIT_OOM_ADJUST;
1430 if (context->nice_set)
1431 if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) {
1437 if (context->cpu_sched_set) {
1438 struct sched_param param = {
1439 .sched_priority = context->cpu_sched_priority,
1442 r = sched_setscheduler(0,
1443 context->cpu_sched_policy |
1444 (context->cpu_sched_reset_on_fork ?
1445 SCHED_RESET_ON_FORK : 0),
1449 r = EXIT_SETSCHEDULER;
1454 if (context->cpuset)
1455 if (sched_setaffinity(0, CPU_ALLOC_SIZE(context->cpuset_ncpus), context->cpuset) < 0) {
1457 r = EXIT_CPUAFFINITY;
1461 if (context->ioprio_set)
1462 if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) {
1468 if (context->timer_slack_nsec != (nsec_t) -1)
1469 if (prctl(PR_SET_TIMERSLACK, context->timer_slack_nsec) < 0) {
1471 r = EXIT_TIMERSLACK;
1475 if (context->personality != 0xffffffffUL)
1476 if (personality(context->personality) < 0) {
1478 r = EXIT_PERSONALITY;
1482 if (context->utmp_id)
1483 utmp_put_init_process(context->utmp_id, getpid(), getsid(0), context->tty_path);
1485 if (context->user) {
1486 username = context->user;
1487 err = get_user_creds(&username, &uid, &gid, &home, &shell);
1493 if (is_terminal_input(context->std_input)) {
1494 err = chown_terminal(STDIN_FILENO, uid);
1503 if (cgroup_path && context->user && context->pam_name) {
1504 err = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER, cgroup_path, 0644, uid, gid);
1511 err = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER, cgroup_path, 0755, uid, gid);
1519 if (!strv_isempty(context->runtime_directory) && runtime_prefix) {
1522 STRV_FOREACH(rt, context->runtime_directory) {
1523 _cleanup_free_ char *p;
1525 p = strjoin(runtime_prefix, "/", *rt, NULL);
1527 r = EXIT_RUNTIME_DIRECTORY;
1532 err = mkdir_safe(p, context->runtime_directory_mode, uid, gid);
1534 r = EXIT_RUNTIME_DIRECTORY;
1540 if (apply_permissions) {
1541 err = enforce_groups(context, username, gid);
1548 umask(context->umask);
1551 if (apply_permissions && context->pam_name && username) {
1552 err = setup_pam(context->pam_name, username, uid, context->tty_path, &pam_env, fds, n_fds);
1559 if (context->private_network && runtime && runtime->netns_storage_socket[0] >= 0) {
1560 err = setup_netns(runtime->netns_storage_socket);
1567 if (!strv_isempty(context->read_write_dirs) ||
1568 !strv_isempty(context->read_only_dirs) ||
1569 !strv_isempty(context->inaccessible_dirs) ||
1570 context->mount_flags != 0 ||
1571 (context->private_tmp && runtime && (runtime->tmp_dir || runtime->var_tmp_dir)) ||
1572 context->private_devices) {
1574 char *tmp = NULL, *var = NULL;
1576 /* The runtime struct only contains the parent
1577 * of the private /tmp, which is
1578 * non-accessible to world users. Inside of it
1579 * there's a /tmp that is sticky, and that's
1580 * the one we want to use here. */
1582 if (context->private_tmp && runtime) {
1583 if (runtime->tmp_dir)
1584 tmp = strappenda(runtime->tmp_dir, "/tmp");
1585 if (runtime->var_tmp_dir)
1586 var = strappenda(runtime->var_tmp_dir, "/tmp");
1589 err = setup_namespace(
1590 context->read_write_dirs,
1591 context->read_only_dirs,
1592 context->inaccessible_dirs,
1595 context->private_devices,
1596 context->mount_flags);
1605 if (context->root_directory)
1606 if (chroot(context->root_directory) < 0) {
1612 if (chdir(context->working_directory ? context->working_directory : "/") < 0) {
1618 _cleanup_free_ char *d = NULL;
1620 if (asprintf(&d, "%s/%s",
1621 context->root_directory ? context->root_directory : "",
1622 context->working_directory ? context->working_directory : "") < 0) {
1635 /* We repeat the fd closing here, to make sure that
1636 * nothing is leaked from the PAM modules */
1637 err = close_all_fds(fds, n_fds);
1639 err = shift_fds(fds, n_fds);
1641 err = flags_fds(fds, n_fds, context->non_blocking);
1647 if (apply_permissions) {
1649 for (i = 0; i < _RLIMIT_MAX; i++) {
1650 if (!context->rlimit[i])
1653 if (setrlimit_closest(i, context->rlimit[i]) < 0) {
1660 if (context->capability_bounding_set_drop) {
1661 err = capability_bounding_set_drop(context->capability_bounding_set_drop, false);
1663 r = EXIT_CAPABILITIES;
1668 if (context->user) {
1669 err = enforce_user(context, uid);
1676 /* PR_GET_SECUREBITS is not privileged, while
1677 * PR_SET_SECUREBITS is. So to suppress
1678 * potential EPERMs we'll try not to call
1679 * PR_SET_SECUREBITS unless necessary. */
1680 if (prctl(PR_GET_SECUREBITS) != context->secure_bits)
1681 if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) {
1683 r = EXIT_SECUREBITS;
1687 if (context->capabilities)
1688 if (cap_set_proc(context->capabilities) < 0) {
1690 r = EXIT_CAPABILITIES;
1694 if (context->no_new_privileges)
1695 if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) {
1697 r = EXIT_NO_NEW_PRIVILEGES;
1702 if (context->address_families_whitelist ||
1703 !set_isempty(context->address_families)) {
1704 err = apply_address_families(context);
1706 r = EXIT_ADDRESS_FAMILIES;
1711 if (context->syscall_whitelist ||
1712 !set_isempty(context->syscall_filter) ||
1713 !set_isempty(context->syscall_archs)) {
1714 err = apply_seccomp(context);
1723 if (context->selinux_context && use_selinux()) {
1724 err = setexeccon(context->selinux_context);
1725 if (err < 0 && !context->selinux_context_ignore) {
1726 r = EXIT_SELINUX_CONTEXT;
1732 #ifdef HAVE_APPARMOR
1733 if (context->apparmor_profile && use_apparmor()) {
1734 err = aa_change_onexec(context->apparmor_profile);
1735 if (err < 0 && !context->apparmor_profile_ignore) {
1736 r = EXIT_APPARMOR_PROFILE;
1743 err = build_environment(context, n_fds, watchdog_usec, home, username, shell, &our_env);
1749 final_env = strv_env_merge(5,
1752 context->environment,
1762 final_argv = replace_env_argv(argv, final_env);
1769 final_env = strv_env_clean(final_env);
1771 if (_unlikely_(log_get_max_level() >= LOG_PRI(LOG_DEBUG))) {
1772 line = exec_command_line(final_argv);
1775 log_struct_unit(LOG_DEBUG,
1777 "EXECUTABLE=%s", command->path,
1778 "MESSAGE=Executing: %s", line,
1785 execve(command->path, final_argv, final_env);
1792 log_struct(LOG_ERR, MESSAGE_ID(SD_MESSAGE_SPAWN_FAILED),
1793 "EXECUTABLE=%s", command->path,
1794 "MESSAGE=Failed at step %s spawning %s: %s",
1795 exit_status_to_string(r, EXIT_STATUS_SYSTEMD),
1796 command->path, strerror(-err),
1805 log_struct_unit(LOG_DEBUG,
1807 "MESSAGE=Forked %s as "PID_FMT,
1811 /* We add the new process to the cgroup both in the child (so
1812 * that we can be sure that no user code is ever executed
1813 * outside of the cgroup) and in the parent (so that we can be
1814 * sure that when we kill the cgroup the process will be
1817 cg_attach(SYSTEMD_CGROUP_CONTROLLER, cgroup_path, pid);
1819 exec_status_start(&command->exec_status, pid);
1825 void exec_context_init(ExecContext *c) {
1829 c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0);
1830 c->cpu_sched_policy = SCHED_OTHER;
1831 c->syslog_priority = LOG_DAEMON|LOG_INFO;
1832 c->syslog_level_prefix = true;
1833 c->ignore_sigpipe = true;
1834 c->timer_slack_nsec = (nsec_t) -1;
1835 c->personality = 0xffffffffUL;
1836 c->runtime_directory_mode = 0755;
1839 void exec_context_done(ExecContext *c) {
1844 strv_free(c->environment);
1845 c->environment = NULL;
1847 strv_free(c->environment_files);
1848 c->environment_files = NULL;
1850 for (l = 0; l < ELEMENTSOF(c->rlimit); l++) {
1852 c->rlimit[l] = NULL;
1855 free(c->working_directory);
1856 c->working_directory = NULL;
1857 free(c->root_directory);
1858 c->root_directory = NULL;
1863 free(c->syslog_identifier);
1864 c->syslog_identifier = NULL;
1872 strv_free(c->supplementary_groups);
1873 c->supplementary_groups = NULL;
1878 if (c->capabilities) {
1879 cap_free(c->capabilities);
1880 c->capabilities = NULL;
1883 strv_free(c->read_only_dirs);
1884 c->read_only_dirs = NULL;
1886 strv_free(c->read_write_dirs);
1887 c->read_write_dirs = NULL;
1889 strv_free(c->inaccessible_dirs);
1890 c->inaccessible_dirs = NULL;
1893 CPU_FREE(c->cpuset);
1898 free(c->selinux_context);
1899 c->selinux_context = NULL;
1901 free(c->apparmor_profile);
1902 c->apparmor_profile = NULL;
1904 set_free(c->syscall_filter);
1905 c->syscall_filter = NULL;
1907 set_free(c->syscall_archs);
1908 c->syscall_archs = NULL;
1910 set_free(c->address_families);
1911 c->address_families = NULL;
1913 strv_free(c->runtime_directory);
1914 c->runtime_directory = NULL;
1917 int exec_context_destroy_runtime_directory(ExecContext *c, const char *runtime_prefix) {
1922 if (!runtime_prefix)
1925 STRV_FOREACH(i, c->runtime_directory) {
1926 _cleanup_free_ char *p;
1928 p = strjoin(runtime_prefix, "/", *i, NULL);
1932 /* We execute this synchronously, since we need to be
1933 * sure this is gone when we start the service
1935 rm_rf_dangerous(p, false, true, false);
1941 void exec_command_done(ExecCommand *c) {
1951 void exec_command_done_array(ExecCommand *c, unsigned n) {
1954 for (i = 0; i < n; i++)
1955 exec_command_done(c+i);
1958 void exec_command_free_list(ExecCommand *c) {
1962 LIST_REMOVE(command, c, i);
1963 exec_command_done(i);
1968 void exec_command_free_array(ExecCommand **c, unsigned n) {
1971 for (i = 0; i < n; i++) {
1972 exec_command_free_list(c[i]);
1977 int exec_context_load_environment(const ExecContext *c, char ***l) {
1978 char **i, **r = NULL;
1983 STRV_FOREACH(i, c->environment_files) {
1986 bool ignore = false;
1988 _cleanup_globfree_ glob_t pglob = {};
1998 if (!path_is_absolute(fn)) {
2006 /* Filename supports globbing, take all matching files */
2008 if (glob(fn, 0, NULL, &pglob) != 0) {
2013 return errno ? -errno : -EINVAL;
2015 count = pglob.gl_pathc;
2023 for (n = 0; n < count; n++) {
2024 k = load_env_file(pglob.gl_pathv[n], NULL, &p);
2032 /* Log invalid environment variables with filename */
2034 p = strv_env_clean_log(p, pglob.gl_pathv[n]);
2041 m = strv_env_merge(2, r, p);
2057 static bool tty_may_match_dev_console(const char *tty) {
2058 char *active = NULL, *console;
2061 if (startswith(tty, "/dev/"))
2064 /* trivial identity? */
2065 if (streq(tty, "console"))
2068 console = resolve_dev_console(&active);
2069 /* if we could not resolve, assume it may */
2073 /* "tty0" means the active VC, so it may be the same sometimes */
2074 b = streq(console, tty) || (streq(console, "tty0") && tty_is_vc(tty));
2080 bool exec_context_may_touch_console(ExecContext *ec) {
2081 return (ec->tty_reset || ec->tty_vhangup || ec->tty_vt_disallocate ||
2082 is_terminal_input(ec->std_input) ||
2083 is_terminal_output(ec->std_output) ||
2084 is_terminal_output(ec->std_error)) &&
2085 tty_may_match_dev_console(tty_path(ec));
2088 static void strv_fprintf(FILE *f, char **l) {
2094 fprintf(f, " %s", *g);
2097 void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
2104 prefix = strempty(prefix);
2108 "%sWorkingDirectory: %s\n"
2109 "%sRootDirectory: %s\n"
2110 "%sNonBlocking: %s\n"
2111 "%sPrivateTmp: %s\n"
2112 "%sPrivateNetwork: %s\n"
2113 "%sPrivateDevices: %s\n"
2114 "%sIgnoreSIGPIPE: %s\n",
2116 prefix, c->working_directory ? c->working_directory : "/",
2117 prefix, c->root_directory ? c->root_directory : "/",
2118 prefix, yes_no(c->non_blocking),
2119 prefix, yes_no(c->private_tmp),
2120 prefix, yes_no(c->private_network),
2121 prefix, yes_no(c->private_devices),
2122 prefix, yes_no(c->ignore_sigpipe));
2124 STRV_FOREACH(e, c->environment)
2125 fprintf(f, "%sEnvironment: %s\n", prefix, *e);
2127 STRV_FOREACH(e, c->environment_files)
2128 fprintf(f, "%sEnvironmentFile: %s\n", prefix, *e);
2135 if (c->oom_score_adjust_set)
2137 "%sOOMScoreAdjust: %i\n",
2138 prefix, c->oom_score_adjust);
2140 for (i = 0; i < RLIM_NLIMITS; i++)
2142 fprintf(f, "%s%s: "RLIM_FMT"\n",
2143 prefix, rlimit_to_string(i), c->rlimit[i]->rlim_max);
2145 if (c->ioprio_set) {
2146 _cleanup_free_ char *class_str = NULL;
2148 ioprio_class_to_string_alloc(IOPRIO_PRIO_CLASS(c->ioprio), &class_str);
2150 "%sIOSchedulingClass: %s\n"
2151 "%sIOPriority: %i\n",
2152 prefix, strna(class_str),
2153 prefix, (int) IOPRIO_PRIO_DATA(c->ioprio));
2156 if (c->cpu_sched_set) {
2157 _cleanup_free_ char *policy_str = NULL;
2159 sched_policy_to_string_alloc(c->cpu_sched_policy, &policy_str);
2161 "%sCPUSchedulingPolicy: %s\n"
2162 "%sCPUSchedulingPriority: %i\n"
2163 "%sCPUSchedulingResetOnFork: %s\n",
2164 prefix, strna(policy_str),
2165 prefix, c->cpu_sched_priority,
2166 prefix, yes_no(c->cpu_sched_reset_on_fork));
2170 fprintf(f, "%sCPUAffinity:", prefix);
2171 for (i = 0; i < c->cpuset_ncpus; i++)
2172 if (CPU_ISSET_S(i, CPU_ALLOC_SIZE(c->cpuset_ncpus), c->cpuset))
2173 fprintf(f, " %u", i);
2177 if (c->timer_slack_nsec != (nsec_t) -1)
2178 fprintf(f, "%sTimerSlackNSec: "NSEC_FMT "\n", prefix, c->timer_slack_nsec);
2181 "%sStandardInput: %s\n"
2182 "%sStandardOutput: %s\n"
2183 "%sStandardError: %s\n",
2184 prefix, exec_input_to_string(c->std_input),
2185 prefix, exec_output_to_string(c->std_output),
2186 prefix, exec_output_to_string(c->std_error));
2192 "%sTTYVHangup: %s\n"
2193 "%sTTYVTDisallocate: %s\n",
2194 prefix, c->tty_path,
2195 prefix, yes_no(c->tty_reset),
2196 prefix, yes_no(c->tty_vhangup),
2197 prefix, yes_no(c->tty_vt_disallocate));
2199 if (c->std_output == EXEC_OUTPUT_SYSLOG ||
2200 c->std_output == EXEC_OUTPUT_KMSG ||
2201 c->std_output == EXEC_OUTPUT_JOURNAL ||
2202 c->std_output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE ||
2203 c->std_output == EXEC_OUTPUT_KMSG_AND_CONSOLE ||
2204 c->std_output == EXEC_OUTPUT_JOURNAL_AND_CONSOLE ||
2205 c->std_error == EXEC_OUTPUT_SYSLOG ||
2206 c->std_error == EXEC_OUTPUT_KMSG ||
2207 c->std_error == EXEC_OUTPUT_JOURNAL ||
2208 c->std_error == EXEC_OUTPUT_SYSLOG_AND_CONSOLE ||
2209 c->std_error == EXEC_OUTPUT_KMSG_AND_CONSOLE ||
2210 c->std_error == EXEC_OUTPUT_JOURNAL_AND_CONSOLE) {
2212 _cleanup_free_ char *fac_str = NULL, *lvl_str = NULL;
2214 log_facility_unshifted_to_string_alloc(c->syslog_priority >> 3, &fac_str);
2215 log_level_to_string_alloc(LOG_PRI(c->syslog_priority), &lvl_str);
2218 "%sSyslogFacility: %s\n"
2219 "%sSyslogLevel: %s\n",
2220 prefix, strna(fac_str),
2221 prefix, strna(lvl_str));
2224 if (c->capabilities) {
2225 _cleanup_cap_free_charp_ char *t;
2227 t = cap_to_text(c->capabilities, NULL);
2229 fprintf(f, "%sCapabilities: %s\n", prefix, t);
2233 fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n",
2235 (c->secure_bits & 1<<SECURE_KEEP_CAPS) ? " keep-caps" : "",
2236 (c->secure_bits & 1<<SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "",
2237 (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "",
2238 (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "",
2239 (c->secure_bits & 1<<SECURE_NOROOT) ? " noroot" : "",
2240 (c->secure_bits & 1<<SECURE_NOROOT_LOCKED) ? "noroot-locked" : "");
2242 if (c->capability_bounding_set_drop) {
2244 fprintf(f, "%sCapabilityBoundingSet:", prefix);
2246 for (l = 0; l <= cap_last_cap(); l++)
2247 if (!(c->capability_bounding_set_drop & ((uint64_t) 1ULL << (uint64_t) l))) {
2248 _cleanup_cap_free_charp_ char *t;
2252 fprintf(f, " %s", t);
2259 fprintf(f, "%sUser: %s\n", prefix, c->user);
2261 fprintf(f, "%sGroup: %s\n", prefix, c->group);
2263 if (strv_length(c->supplementary_groups) > 0) {
2264 fprintf(f, "%sSupplementaryGroups:", prefix);
2265 strv_fprintf(f, c->supplementary_groups);
2270 fprintf(f, "%sPAMName: %s\n", prefix, c->pam_name);
2272 if (strv_length(c->read_write_dirs) > 0) {
2273 fprintf(f, "%sReadWriteDirs:", prefix);
2274 strv_fprintf(f, c->read_write_dirs);
2278 if (strv_length(c->read_only_dirs) > 0) {
2279 fprintf(f, "%sReadOnlyDirs:", prefix);
2280 strv_fprintf(f, c->read_only_dirs);
2284 if (strv_length(c->inaccessible_dirs) > 0) {
2285 fprintf(f, "%sInaccessibleDirs:", prefix);
2286 strv_fprintf(f, c->inaccessible_dirs);
2292 "%sUtmpIdentifier: %s\n",
2293 prefix, c->utmp_id);
2295 if (c->selinux_context)
2297 "%sSELinuxContext: %s%s\n",
2298 prefix, c->selinux_context_ignore ? "-" : "", c->selinux_context);
2300 if (c->personality != 0xffffffffUL)
2302 "%sPersonality: %s\n",
2303 prefix, strna(personality_to_string(c->personality)));
2305 if (c->syscall_filter) {
2313 "%sSystemCallFilter: ",
2316 if (!c->syscall_whitelist)
2320 SET_FOREACH(id, c->syscall_filter, j) {
2321 _cleanup_free_ char *name = NULL;
2328 name = seccomp_syscall_resolve_num_arch(SCMP_ARCH_NATIVE, PTR_TO_INT(id) - 1);
2329 fputs(strna(name), f);
2336 if (c->syscall_archs) {
2343 "%sSystemCallArchitectures:",
2347 SET_FOREACH(id, c->syscall_archs, j)
2348 fprintf(f, " %s", strna(seccomp_arch_to_string(PTR_TO_UINT32(id) - 1)));
2353 if (c->syscall_errno != 0)
2355 "%sSystemCallErrorNumber: %s\n",
2356 prefix, strna(errno_to_name(c->syscall_errno)));
2358 if (c->apparmor_profile)
2360 "%sAppArmorProfile: %s%s\n",
2361 prefix, c->apparmor_profile_ignore ? "-" : "", c->apparmor_profile);
2364 void exec_status_start(ExecStatus *s, pid_t pid) {
2369 dual_timestamp_get(&s->start_timestamp);
2372 void exec_status_exit(ExecStatus *s, ExecContext *context, pid_t pid, int code, int status) {
2375 if (s->pid && s->pid != pid)
2379 dual_timestamp_get(&s->exit_timestamp);
2385 if (context->utmp_id)
2386 utmp_put_dead_process(context->utmp_id, pid, code, status);
2388 exec_context_tty_reset(context);
2392 void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) {
2393 char buf[FORMAT_TIMESTAMP_MAX];
2405 "%sPID: "PID_FMT"\n",
2408 if (s->start_timestamp.realtime > 0)
2410 "%sStart Timestamp: %s\n",
2411 prefix, format_timestamp(buf, sizeof(buf), s->start_timestamp.realtime));
2413 if (s->exit_timestamp.realtime > 0)
2415 "%sExit Timestamp: %s\n"
2417 "%sExit Status: %i\n",
2418 prefix, format_timestamp(buf, sizeof(buf), s->exit_timestamp.realtime),
2419 prefix, sigchld_code_to_string(s->code),
2423 char *exec_command_line(char **argv) {
2431 STRV_FOREACH(a, argv)
2434 if (!(n = new(char, k)))
2438 STRV_FOREACH(a, argv) {
2445 if (strpbrk(*a, WHITESPACE)) {
2456 /* FIXME: this doesn't really handle arguments that have
2457 * spaces and ticks in them */
2462 void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) {
2464 const char *prefix2;
2473 p2 = strappend(prefix, "\t");
2474 prefix2 = p2 ? p2 : prefix;
2476 cmd = exec_command_line(c->argv);
2479 "%sCommand Line: %s\n",
2480 prefix, cmd ? cmd : strerror(ENOMEM));
2484 exec_status_dump(&c->exec_status, f, prefix2);
2489 void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) {
2495 LIST_FOREACH(command, c, c)
2496 exec_command_dump(c, f, prefix);
2499 void exec_command_append_list(ExecCommand **l, ExecCommand *e) {
2506 /* It's kind of important, that we keep the order here */
2507 LIST_FIND_TAIL(command, *l, end);
2508 LIST_INSERT_AFTER(command, *l, end, e);
2513 int exec_command_set(ExecCommand *c, const char *path, ...) {
2521 l = strv_new_ap(path, ap);
2542 static int exec_runtime_allocate(ExecRuntime **rt) {
2547 *rt = new0(ExecRuntime, 1);
2552 (*rt)->netns_storage_socket[0] = (*rt)->netns_storage_socket[1] = -1;
2557 int exec_runtime_make(ExecRuntime **rt, ExecContext *c, const char *id) {
2567 if (!c->private_network && !c->private_tmp)
2570 r = exec_runtime_allocate(rt);
2574 if (c->private_network && (*rt)->netns_storage_socket[0] < 0) {
2575 if (socketpair(AF_UNIX, SOCK_DGRAM, 0, (*rt)->netns_storage_socket) < 0)
2579 if (c->private_tmp && !(*rt)->tmp_dir) {
2580 r = setup_tmp_dirs(id, &(*rt)->tmp_dir, &(*rt)->var_tmp_dir);
2588 ExecRuntime *exec_runtime_ref(ExecRuntime *r) {
2590 assert(r->n_ref > 0);
2596 ExecRuntime *exec_runtime_unref(ExecRuntime *r) {
2601 assert(r->n_ref > 0);
2604 if (r->n_ref <= 0) {
2606 free(r->var_tmp_dir);
2607 safe_close_pair(r->netns_storage_socket);
2614 int exec_runtime_serialize(ExecRuntime *rt, Unit *u, FILE *f, FDSet *fds) {
2623 unit_serialize_item(u, f, "tmp-dir", rt->tmp_dir);
2625 if (rt->var_tmp_dir)
2626 unit_serialize_item(u, f, "var-tmp-dir", rt->var_tmp_dir);
2628 if (rt->netns_storage_socket[0] >= 0) {
2631 copy = fdset_put_dup(fds, rt->netns_storage_socket[0]);
2635 unit_serialize_item_format(u, f, "netns-socket-0", "%i", copy);
2638 if (rt->netns_storage_socket[1] >= 0) {
2641 copy = fdset_put_dup(fds, rt->netns_storage_socket[1]);
2645 unit_serialize_item_format(u, f, "netns-socket-1", "%i", copy);
2651 int exec_runtime_deserialize_item(ExecRuntime **rt, Unit *u, const char *key, const char *value, FDSet *fds) {
2658 if (streq(key, "tmp-dir")) {
2661 r = exec_runtime_allocate(rt);
2665 copy = strdup(value);
2669 free((*rt)->tmp_dir);
2670 (*rt)->tmp_dir = copy;
2672 } else if (streq(key, "var-tmp-dir")) {
2675 r = exec_runtime_allocate(rt);
2679 copy = strdup(value);
2683 free((*rt)->var_tmp_dir);
2684 (*rt)->var_tmp_dir = copy;
2686 } else if (streq(key, "netns-socket-0")) {
2689 r = exec_runtime_allocate(rt);
2693 if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd))
2694 log_debug_unit(u->id, "Failed to parse netns socket value %s", value);
2696 safe_close((*rt)->netns_storage_socket[0]);
2697 (*rt)->netns_storage_socket[0] = fdset_remove(fds, fd);
2699 } else if (streq(key, "netns-socket-1")) {
2702 r = exec_runtime_allocate(rt);
2706 if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd))
2707 log_debug_unit(u->id, "Failed to parse netns socket value %s", value);
2709 safe_close((*rt)->netns_storage_socket[1]);
2710 (*rt)->netns_storage_socket[1] = fdset_remove(fds, fd);
2718 static void *remove_tmpdir_thread(void *p) {
2719 _cleanup_free_ char *path = p;
2721 rm_rf_dangerous(path, false, true, false);
2725 void exec_runtime_destroy(ExecRuntime *rt) {
2731 /* If there are multiple users of this, let's leave the stuff around */
2736 log_debug("Spawning thread to nuke %s", rt->tmp_dir);
2738 r = asynchronous_job(remove_tmpdir_thread, rt->tmp_dir);
2740 log_warning("Failed to nuke %s: %s", rt->tmp_dir, strerror(-r));
2747 if (rt->var_tmp_dir) {
2748 log_debug("Spawning thread to nuke %s", rt->var_tmp_dir);
2750 r = asynchronous_job(remove_tmpdir_thread, rt->var_tmp_dir);
2752 log_warning("Failed to nuke %s: %s", rt->var_tmp_dir, strerror(-r));
2753 free(rt->var_tmp_dir);
2756 rt->var_tmp_dir = NULL;
2759 safe_close_pair(rt->netns_storage_socket);
2762 static const char* const exec_input_table[_EXEC_INPUT_MAX] = {
2763 [EXEC_INPUT_NULL] = "null",
2764 [EXEC_INPUT_TTY] = "tty",
2765 [EXEC_INPUT_TTY_FORCE] = "tty-force",
2766 [EXEC_INPUT_TTY_FAIL] = "tty-fail",
2767 [EXEC_INPUT_SOCKET] = "socket"
2770 DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput);
2772 static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = {
2773 [EXEC_OUTPUT_INHERIT] = "inherit",
2774 [EXEC_OUTPUT_NULL] = "null",
2775 [EXEC_OUTPUT_TTY] = "tty",
2776 [EXEC_OUTPUT_SYSLOG] = "syslog",
2777 [EXEC_OUTPUT_SYSLOG_AND_CONSOLE] = "syslog+console",
2778 [EXEC_OUTPUT_KMSG] = "kmsg",
2779 [EXEC_OUTPUT_KMSG_AND_CONSOLE] = "kmsg+console",
2780 [EXEC_OUTPUT_JOURNAL] = "journal",
2781 [EXEC_OUTPUT_JOURNAL_AND_CONSOLE] = "journal+console",
2782 [EXEC_OUTPUT_SOCKET] = "socket"
2785 DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput);