2132 lines
68 KiB
C
2132 lines
68 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <assert.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <signal.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <sys/prctl.h>
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#include <linux/sched.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <grp.h>
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#include <pwd.h>
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#include <sys/mount.h>
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#include <linux/fs.h>
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#include <linux/oom.h>
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#include <sys/poll.h>
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#include <linux/seccomp-bpf.h>
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#ifdef HAVE_PAM
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#include <security/pam_appl.h>
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#endif
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#include "execute.h"
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#include "strv.h"
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#include "macro.h"
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#include "capability.h"
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#include "util.h"
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#include "log.h"
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#include "sd-messages.h"
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#include "ioprio.h"
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#include "securebits.h"
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#include "cgroup.h"
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#include "namespace.h"
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#include "tcpwrap.h"
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#include "exit-status.h"
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#include "missing.h"
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#include "utmp-wtmp.h"
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#include "def.h"
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#include "loopback-setup.h"
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#include "path-util.h"
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#include "syscall-list.h"
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#define IDLE_TIMEOUT_USEC (5*USEC_PER_SEC)
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/* This assumes there is a 'tty' group */
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#define TTY_MODE 0620
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static int shift_fds(int fds[], unsigned n_fds) {
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int start, restart_from;
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if (n_fds <= 0)
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return 0;
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/* Modifies the fds array! (sorts it) */
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assert(fds);
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start = 0;
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for (;;) {
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int i;
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restart_from = -1;
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for (i = start; i < (int) n_fds; i++) {
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int nfd;
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/* Already at right index? */
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if (fds[i] == i+3)
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continue;
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if ((nfd = fcntl(fds[i], F_DUPFD, i+3)) < 0)
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return -errno;
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close_nointr_nofail(fds[i]);
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fds[i] = nfd;
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/* Hmm, the fd we wanted isn't free? Then
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* let's remember that and try again from here*/
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if (nfd != i+3 && restart_from < 0)
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restart_from = i;
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}
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if (restart_from < 0)
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break;
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start = restart_from;
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}
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return 0;
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}
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static int flags_fds(const int fds[], unsigned n_fds, bool nonblock) {
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unsigned i;
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int r;
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if (n_fds <= 0)
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return 0;
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assert(fds);
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/* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */
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for (i = 0; i < n_fds; i++) {
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if ((r = fd_nonblock(fds[i], nonblock)) < 0)
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return r;
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/* We unconditionally drop FD_CLOEXEC from the fds,
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* since after all we want to pass these fds to our
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* children */
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if ((r = fd_cloexec(fds[i], false)) < 0)
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return r;
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}
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return 0;
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}
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static const char *tty_path(const ExecContext *context) {
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assert(context);
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if (context->tty_path)
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return context->tty_path;
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return "/dev/console";
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}
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void exec_context_tty_reset(const ExecContext *context) {
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assert(context);
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if (context->tty_vhangup)
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terminal_vhangup(tty_path(context));
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if (context->tty_reset)
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reset_terminal(tty_path(context));
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if (context->tty_vt_disallocate && context->tty_path)
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vt_disallocate(context->tty_path);
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}
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static int open_null_as(int flags, int nfd) {
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int fd, r;
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assert(nfd >= 0);
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if ((fd = open("/dev/null", flags|O_NOCTTY)) < 0)
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return -errno;
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if (fd != nfd) {
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r = dup2(fd, nfd) < 0 ? -errno : nfd;
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close_nointr_nofail(fd);
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} else
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r = nfd;
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return r;
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}
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static int connect_logger_as(const ExecContext *context, ExecOutput output, const char *ident, const char *unit_id, int nfd) {
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int fd, r;
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union sockaddr_union sa;
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assert(context);
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assert(output < _EXEC_OUTPUT_MAX);
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assert(ident);
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assert(nfd >= 0);
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fd = socket(AF_UNIX, SOCK_STREAM, 0);
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if (fd < 0)
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return -errno;
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zero(sa);
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sa.un.sun_family = AF_UNIX;
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strncpy(sa.un.sun_path, "/run/systemd/journal/stdout", sizeof(sa.un.sun_path));
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r = connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path));
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if (r < 0) {
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close_nointr_nofail(fd);
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return -errno;
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}
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if (shutdown(fd, SHUT_RD) < 0) {
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close_nointr_nofail(fd);
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return -errno;
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}
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dprintf(fd,
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"%s\n"
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"%s\n"
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"%i\n"
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"%i\n"
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"%i\n"
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"%i\n"
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"%i\n",
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context->syslog_identifier ? context->syslog_identifier : ident,
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unit_id,
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context->syslog_priority,
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!!context->syslog_level_prefix,
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output == EXEC_OUTPUT_SYSLOG || output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE,
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output == EXEC_OUTPUT_KMSG || output == EXEC_OUTPUT_KMSG_AND_CONSOLE,
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output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || output == EXEC_OUTPUT_KMSG_AND_CONSOLE || output == EXEC_OUTPUT_JOURNAL_AND_CONSOLE);
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if (fd != nfd) {
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r = dup2(fd, nfd) < 0 ? -errno : nfd;
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close_nointr_nofail(fd);
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} else
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r = nfd;
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return r;
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}
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static int open_terminal_as(const char *path, mode_t mode, int nfd) {
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int fd, r;
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assert(path);
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assert(nfd >= 0);
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if ((fd = open_terminal(path, mode | O_NOCTTY)) < 0)
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return fd;
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if (fd != nfd) {
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r = dup2(fd, nfd) < 0 ? -errno : nfd;
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close_nointr_nofail(fd);
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} else
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r = nfd;
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return r;
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}
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static bool is_terminal_input(ExecInput i) {
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return
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i == EXEC_INPUT_TTY ||
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i == EXEC_INPUT_TTY_FORCE ||
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i == EXEC_INPUT_TTY_FAIL;
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}
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static int fixup_input(ExecInput std_input, int socket_fd, bool apply_tty_stdin) {
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if (is_terminal_input(std_input) && !apply_tty_stdin)
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return EXEC_INPUT_NULL;
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if (std_input == EXEC_INPUT_SOCKET && socket_fd < 0)
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return EXEC_INPUT_NULL;
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return std_input;
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}
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static int fixup_output(ExecOutput std_output, int socket_fd) {
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if (std_output == EXEC_OUTPUT_SOCKET && socket_fd < 0)
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return EXEC_OUTPUT_INHERIT;
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return std_output;
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}
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static int setup_input(const ExecContext *context, int socket_fd, bool apply_tty_stdin) {
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ExecInput i;
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assert(context);
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i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
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switch (i) {
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case EXEC_INPUT_NULL:
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return open_null_as(O_RDONLY, STDIN_FILENO);
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case EXEC_INPUT_TTY:
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case EXEC_INPUT_TTY_FORCE:
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case EXEC_INPUT_TTY_FAIL: {
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int fd, r;
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if ((fd = acquire_terminal(
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tty_path(context),
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i == EXEC_INPUT_TTY_FAIL,
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i == EXEC_INPUT_TTY_FORCE,
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false,
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(usec_t) -1)) < 0)
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return fd;
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if (fd != STDIN_FILENO) {
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r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
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close_nointr_nofail(fd);
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} else
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r = STDIN_FILENO;
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return r;
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}
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case EXEC_INPUT_SOCKET:
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return dup2(socket_fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
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default:
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assert_not_reached("Unknown input type");
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}
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}
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static int setup_output(const ExecContext *context, int socket_fd, const char *ident, const char *unit_id, bool apply_tty_stdin) {
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ExecOutput o;
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ExecInput i;
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assert(context);
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assert(ident);
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i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
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o = fixup_output(context->std_output, socket_fd);
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/* This expects the input is already set up */
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switch (o) {
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case EXEC_OUTPUT_INHERIT:
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/* If input got downgraded, inherit the original value */
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if (i == EXEC_INPUT_NULL && is_terminal_input(context->std_input))
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return open_terminal_as(tty_path(context), O_WRONLY, STDOUT_FILENO);
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/* If the input is connected to anything that's not a /dev/null, inherit that... */
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if (i != EXEC_INPUT_NULL)
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return dup2(STDIN_FILENO, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
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/* If we are not started from PID 1 we just inherit STDOUT from our parent process. */
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if (getppid() != 1)
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return STDOUT_FILENO;
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/* We need to open /dev/null here anew, to get the
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* right access mode. So we fall through */
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case EXEC_OUTPUT_NULL:
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return open_null_as(O_WRONLY, STDOUT_FILENO);
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case EXEC_OUTPUT_TTY:
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if (is_terminal_input(i))
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return dup2(STDIN_FILENO, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
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/* We don't reset the terminal if this is just about output */
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return open_terminal_as(tty_path(context), O_WRONLY, STDOUT_FILENO);
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case EXEC_OUTPUT_SYSLOG:
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case EXEC_OUTPUT_SYSLOG_AND_CONSOLE:
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case EXEC_OUTPUT_KMSG:
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case EXEC_OUTPUT_KMSG_AND_CONSOLE:
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case EXEC_OUTPUT_JOURNAL:
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case EXEC_OUTPUT_JOURNAL_AND_CONSOLE:
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return connect_logger_as(context, o, ident, unit_id, STDOUT_FILENO);
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case EXEC_OUTPUT_SOCKET:
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assert(socket_fd >= 0);
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return dup2(socket_fd, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
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default:
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assert_not_reached("Unknown output type");
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}
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}
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static int setup_error(const ExecContext *context, int socket_fd, const char *ident, const char *unit_id, bool apply_tty_stdin) {
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ExecOutput o, e;
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ExecInput i;
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assert(context);
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assert(ident);
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i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
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o = fixup_output(context->std_output, socket_fd);
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e = fixup_output(context->std_error, socket_fd);
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/* This expects the input and output are already set up */
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/* Don't change the stderr file descriptor if we inherit all
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* the way and are not on a tty */
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if (e == EXEC_OUTPUT_INHERIT &&
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o == EXEC_OUTPUT_INHERIT &&
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i == EXEC_INPUT_NULL &&
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!is_terminal_input(context->std_input) &&
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getppid () != 1)
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return STDERR_FILENO;
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|
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/* Duplicate from stdout if possible */
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if (e == o || e == EXEC_OUTPUT_INHERIT)
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return dup2(STDOUT_FILENO, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
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switch (e) {
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case EXEC_OUTPUT_NULL:
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return open_null_as(O_WRONLY, STDERR_FILENO);
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case EXEC_OUTPUT_TTY:
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if (is_terminal_input(i))
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return dup2(STDIN_FILENO, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
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|
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/* We don't reset the terminal if this is just about output */
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return open_terminal_as(tty_path(context), O_WRONLY, STDERR_FILENO);
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|
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case EXEC_OUTPUT_SYSLOG:
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case EXEC_OUTPUT_SYSLOG_AND_CONSOLE:
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case EXEC_OUTPUT_KMSG:
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case EXEC_OUTPUT_KMSG_AND_CONSOLE:
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case EXEC_OUTPUT_JOURNAL:
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case EXEC_OUTPUT_JOURNAL_AND_CONSOLE:
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return connect_logger_as(context, e, ident, unit_id, STDERR_FILENO);
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|
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case EXEC_OUTPUT_SOCKET:
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assert(socket_fd >= 0);
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return dup2(socket_fd, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
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|
|
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default:
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assert_not_reached("Unknown error type");
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}
|
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}
|
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static int chown_terminal(int fd, uid_t uid) {
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struct stat st;
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|
|
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assert(fd >= 0);
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|
|
|
/* This might fail. What matters are the results. */
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(void) fchown(fd, uid, -1);
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(void) fchmod(fd, TTY_MODE);
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|
|
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if (fstat(fd, &st) < 0)
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return -errno;
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|
|
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if (st.st_uid != uid || (st.st_mode & 0777) != TTY_MODE)
|
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return -EPERM;
|
|
|
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return 0;
|
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}
|
|
|
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static int setup_confirm_stdio(int *_saved_stdin,
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int *_saved_stdout) {
|
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int fd = -1, saved_stdin, saved_stdout = -1, r;
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|
|
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assert(_saved_stdin);
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|
assert(_saved_stdout);
|
|
|
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saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3);
|
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if (saved_stdin < 0)
|
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return -errno;
|
|
|
|
saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3);
|
|
if (saved_stdout < 0) {
|
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r = errno;
|
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goto fail;
|
|
}
|
|
|
|
fd = acquire_terminal(
|
|
"/dev/console",
|
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false,
|
|
false,
|
|
false,
|
|
DEFAULT_CONFIRM_USEC);
|
|
if (fd < 0) {
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r = fd;
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goto fail;
|
|
}
|
|
|
|
r = chown_terminal(fd, getuid());
|
|
if (r < 0)
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goto fail;
|
|
|
|
if (dup2(fd, STDIN_FILENO) < 0) {
|
|
r = -errno;
|
|
goto fail;
|
|
}
|
|
|
|
if (dup2(fd, STDOUT_FILENO) < 0) {
|
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r = -errno;
|
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goto fail;
|
|
}
|
|
|
|
if (fd >= 2)
|
|
close_nointr_nofail(fd);
|
|
|
|
*_saved_stdin = saved_stdin;
|
|
*_saved_stdout = saved_stdout;
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|
|
return 0;
|
|
|
|
fail:
|
|
if (saved_stdout >= 0)
|
|
close_nointr_nofail(saved_stdout);
|
|
|
|
if (saved_stdin >= 0)
|
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close_nointr_nofail(saved_stdin);
|
|
|
|
if (fd >= 0)
|
|
close_nointr_nofail(fd);
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|
|
|
return r;
|
|
}
|
|
|
|
static int write_confirm_message(const char *format, ...) {
|
|
int fd;
|
|
va_list ap;
|
|
|
|
assert(format);
|
|
|
|
fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
va_start(ap, format);
|
|
vdprintf(fd, format, ap);
|
|
va_end(ap);
|
|
|
|
close_nointr_nofail(fd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int restore_confirm_stdio(int *saved_stdin,
|
|
int *saved_stdout) {
|
|
|
|
int r = 0;
|
|
|
|
assert(saved_stdin);
|
|
assert(saved_stdout);
|
|
|
|
release_terminal();
|
|
|
|
if (*saved_stdin >= 0)
|
|
if (dup2(*saved_stdin, STDIN_FILENO) < 0)
|
|
r = -errno;
|
|
|
|
if (*saved_stdout >= 0)
|
|
if (dup2(*saved_stdout, STDOUT_FILENO) < 0)
|
|
r = -errno;
|
|
|
|
if (*saved_stdin >= 0)
|
|
close_nointr_nofail(*saved_stdin);
|
|
|
|
if (*saved_stdout >= 0)
|
|
close_nointr_nofail(*saved_stdout);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int ask_for_confirmation(char *response, char **argv) {
|
|
int saved_stdout = -1, saved_stdin = -1, r;
|
|
char *line;
|
|
|
|
r = setup_confirm_stdio(&saved_stdin, &saved_stdout);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
line = exec_command_line(argv);
|
|
if (!line)
|
|
return -ENOMEM;
|
|
|
|
r = ask(response, "yns", "Execute %s? [Yes, No, Skip] ", line);
|
|
free(line);
|
|
|
|
restore_confirm_stdio(&saved_stdin, &saved_stdout);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) {
|
|
bool keep_groups = false;
|
|
int r;
|
|
|
|
assert(context);
|
|
|
|
/* Lookup and set GID and supplementary group list. Here too
|
|
* we avoid NSS lookups for gid=0. */
|
|
|
|
if (context->group || username) {
|
|
|
|
if (context->group) {
|
|
const char *g = context->group;
|
|
|
|
if ((r = get_group_creds(&g, &gid)) < 0)
|
|
return r;
|
|
}
|
|
|
|
/* First step, initialize groups from /etc/groups */
|
|
if (username && gid != 0) {
|
|
if (initgroups(username, gid) < 0)
|
|
return -errno;
|
|
|
|
keep_groups = true;
|
|
}
|
|
|
|
/* Second step, set our gids */
|
|
if (setresgid(gid, gid, gid) < 0)
|
|
return -errno;
|
|
}
|
|
|
|
if (context->supplementary_groups) {
|
|
int ngroups_max, k;
|
|
gid_t *gids;
|
|
char **i;
|
|
|
|
/* Final step, initialize any manually set supplementary groups */
|
|
assert_se((ngroups_max = (int) sysconf(_SC_NGROUPS_MAX)) > 0);
|
|
|
|
if (!(gids = new(gid_t, ngroups_max)))
|
|
return -ENOMEM;
|
|
|
|
if (keep_groups) {
|
|
if ((k = getgroups(ngroups_max, gids)) < 0) {
|
|
free(gids);
|
|
return -errno;
|
|
}
|
|
} else
|
|
k = 0;
|
|
|
|
STRV_FOREACH(i, context->supplementary_groups) {
|
|
const char *g;
|
|
|
|
if (k >= ngroups_max) {
|
|
free(gids);
|
|
return -E2BIG;
|
|
}
|
|
|
|
g = *i;
|
|
r = get_group_creds(&g, gids+k);
|
|
if (r < 0) {
|
|
free(gids);
|
|
return r;
|
|
}
|
|
|
|
k++;
|
|
}
|
|
|
|
if (setgroups(k, gids) < 0) {
|
|
free(gids);
|
|
return -errno;
|
|
}
|
|
|
|
free(gids);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int enforce_user(const ExecContext *context, uid_t uid) {
|
|
int r;
|
|
assert(context);
|
|
|
|
/* Sets (but doesn't lookup) the uid and make sure we keep the
|
|
* capabilities while doing so. */
|
|
|
|
if (context->capabilities) {
|
|
cap_t d;
|
|
static const cap_value_t bits[] = {
|
|
CAP_SETUID, /* Necessary so that we can run setresuid() below */
|
|
CAP_SETPCAP /* Necessary so that we can set PR_SET_SECUREBITS later on */
|
|
};
|
|
|
|
/* First step: If we need to keep capabilities but
|
|
* drop privileges we need to make sure we keep our
|
|
* caps, whiel we drop privileges. */
|
|
if (uid != 0) {
|
|
int sb = context->secure_bits|SECURE_KEEP_CAPS;
|
|
|
|
if (prctl(PR_GET_SECUREBITS) != sb)
|
|
if (prctl(PR_SET_SECUREBITS, sb) < 0)
|
|
return -errno;
|
|
}
|
|
|
|
/* Second step: set the capabilities. This will reduce
|
|
* the capabilities to the minimum we need. */
|
|
|
|
if (!(d = cap_dup(context->capabilities)))
|
|
return -errno;
|
|
|
|
if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 ||
|
|
cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0) {
|
|
r = -errno;
|
|
cap_free(d);
|
|
return r;
|
|
}
|
|
|
|
if (cap_set_proc(d) < 0) {
|
|
r = -errno;
|
|
cap_free(d);
|
|
return r;
|
|
}
|
|
|
|
cap_free(d);
|
|
}
|
|
|
|
/* Third step: actually set the uids */
|
|
if (setresuid(uid, uid, uid) < 0)
|
|
return -errno;
|
|
|
|
/* At this point we should have all necessary capabilities but
|
|
are otherwise a normal user. However, the caps might got
|
|
corrupted due to the setresuid() so we need clean them up
|
|
later. This is done outside of this call. */
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef HAVE_PAM
|
|
|
|
static int null_conv(
|
|
int num_msg,
|
|
const struct pam_message **msg,
|
|
struct pam_response **resp,
|
|
void *appdata_ptr) {
|
|
|
|
/* We don't support conversations */
|
|
|
|
return PAM_CONV_ERR;
|
|
}
|
|
|
|
static int setup_pam(
|
|
const char *name,
|
|
const char *user,
|
|
uid_t uid,
|
|
const char *tty,
|
|
char ***pam_env,
|
|
int fds[], unsigned n_fds) {
|
|
|
|
static const struct pam_conv conv = {
|
|
.conv = null_conv,
|
|
.appdata_ptr = NULL
|
|
};
|
|
|
|
pam_handle_t *handle = NULL;
|
|
sigset_t ss, old_ss;
|
|
int pam_code = PAM_SUCCESS;
|
|
int err;
|
|
char **e = NULL;
|
|
bool close_session = false;
|
|
pid_t pam_pid = 0, parent_pid;
|
|
|
|
assert(name);
|
|
assert(user);
|
|
assert(pam_env);
|
|
|
|
/* We set up PAM in the parent process, then fork. The child
|
|
* will then stay around until killed via PR_GET_PDEATHSIG or
|
|
* systemd via the cgroup logic. It will then remove the PAM
|
|
* session again. The parent process will exec() the actual
|
|
* daemon. We do things this way to ensure that the main PID
|
|
* of the daemon is the one we initially fork()ed. */
|
|
|
|
if ((pam_code = pam_start(name, user, &conv, &handle)) != PAM_SUCCESS) {
|
|
handle = NULL;
|
|
goto fail;
|
|
}
|
|
|
|
if (tty)
|
|
if ((pam_code = pam_set_item(handle, PAM_TTY, tty)) != PAM_SUCCESS)
|
|
goto fail;
|
|
|
|
if ((pam_code = pam_acct_mgmt(handle, PAM_SILENT)) != PAM_SUCCESS)
|
|
goto fail;
|
|
|
|
if ((pam_code = pam_open_session(handle, PAM_SILENT)) != PAM_SUCCESS)
|
|
goto fail;
|
|
|
|
close_session = true;
|
|
|
|
if ((!(e = pam_getenvlist(handle)))) {
|
|
pam_code = PAM_BUF_ERR;
|
|
goto fail;
|
|
}
|
|
|
|
/* Block SIGTERM, so that we know that it won't get lost in
|
|
* the child */
|
|
if (sigemptyset(&ss) < 0 ||
|
|
sigaddset(&ss, SIGTERM) < 0 ||
|
|
sigprocmask(SIG_BLOCK, &ss, &old_ss) < 0)
|
|
goto fail;
|
|
|
|
parent_pid = getpid();
|
|
|
|
if ((pam_pid = fork()) < 0)
|
|
goto fail;
|
|
|
|
if (pam_pid == 0) {
|
|
int sig;
|
|
int r = EXIT_PAM;
|
|
|
|
/* The child's job is to reset the PAM session on
|
|
* termination */
|
|
|
|
/* This string must fit in 10 chars (i.e. the length
|
|
* of "/sbin/init"), to look pretty in /bin/ps */
|
|
rename_process("(sd-pam)");
|
|
|
|
/* Make sure we don't keep open the passed fds in this
|
|
child. We assume that otherwise only those fds are
|
|
open here that have been opened by PAM. */
|
|
close_many(fds, n_fds);
|
|
|
|
/* Drop privileges - we don't need any to pam_close_session
|
|
* and this will make PR_SET_PDEATHSIG work in most cases.
|
|
* If this fails, ignore the error - but expect sd-pam threads
|
|
* to fail to exit normally */
|
|
if (setresuid(uid, uid, uid) < 0)
|
|
log_error("Error: Failed to setresuid() in sd-pam: %s", strerror(-r));
|
|
|
|
/* Wait until our parent died. This will only work if
|
|
* the above setresuid() succeeds, otherwise the kernel
|
|
* will not allow unprivileged parents kill their privileged
|
|
* children this way. We rely on the control groups kill logic
|
|
* to do the rest for us. */
|
|
if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
|
|
goto child_finish;
|
|
|
|
/* Check if our parent process might already have
|
|
* died? */
|
|
if (getppid() == parent_pid) {
|
|
for (;;) {
|
|
if (sigwait(&ss, &sig) < 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
|
|
goto child_finish;
|
|
}
|
|
|
|
assert(sig == SIGTERM);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* If our parent died we'll end the session */
|
|
if (getppid() != parent_pid)
|
|
if ((pam_code = pam_close_session(handle, PAM_DATA_SILENT)) != PAM_SUCCESS)
|
|
goto child_finish;
|
|
|
|
r = 0;
|
|
|
|
child_finish:
|
|
pam_end(handle, pam_code | PAM_DATA_SILENT);
|
|
_exit(r);
|
|
}
|
|
|
|
/* If the child was forked off successfully it will do all the
|
|
* cleanups, so forget about the handle here. */
|
|
handle = NULL;
|
|
|
|
/* Unblock SIGTERM again in the parent */
|
|
if (sigprocmask(SIG_SETMASK, &old_ss, NULL) < 0)
|
|
goto fail;
|
|
|
|
/* We close the log explicitly here, since the PAM modules
|
|
* might have opened it, but we don't want this fd around. */
|
|
closelog();
|
|
|
|
*pam_env = e;
|
|
e = NULL;
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
if (pam_code != PAM_SUCCESS)
|
|
err = -EPERM; /* PAM errors do not map to errno */
|
|
else
|
|
err = -errno;
|
|
|
|
if (handle) {
|
|
if (close_session)
|
|
pam_code = pam_close_session(handle, PAM_DATA_SILENT);
|
|
|
|
pam_end(handle, pam_code | PAM_DATA_SILENT);
|
|
}
|
|
|
|
strv_free(e);
|
|
|
|
closelog();
|
|
|
|
if (pam_pid > 1) {
|
|
kill(pam_pid, SIGTERM);
|
|
kill(pam_pid, SIGCONT);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
#endif
|
|
|
|
static void rename_process_from_path(const char *path) {
|
|
char process_name[11];
|
|
const char *p;
|
|
size_t l;
|
|
|
|
/* This resulting string must fit in 10 chars (i.e. the length
|
|
* of "/sbin/init") to look pretty in /bin/ps */
|
|
|
|
p = path_get_file_name(path);
|
|
if (isempty(p)) {
|
|
rename_process("(...)");
|
|
return;
|
|
}
|
|
|
|
l = strlen(p);
|
|
if (l > 8) {
|
|
/* The end of the process name is usually more
|
|
* interesting, since the first bit might just be
|
|
* "systemd-" */
|
|
p = p + l - 8;
|
|
l = 8;
|
|
}
|
|
|
|
process_name[0] = '(';
|
|
memcpy(process_name+1, p, l);
|
|
process_name[1+l] = ')';
|
|
process_name[1+l+1] = 0;
|
|
|
|
rename_process(process_name);
|
|
}
|
|
|
|
static int apply_seccomp(uint32_t *syscall_filter) {
|
|
static const struct sock_filter header[] = {
|
|
VALIDATE_ARCHITECTURE,
|
|
EXAMINE_SYSCALL
|
|
};
|
|
static const struct sock_filter footer[] = {
|
|
_KILL_PROCESS
|
|
};
|
|
|
|
int i;
|
|
unsigned n;
|
|
struct sock_filter *f;
|
|
struct sock_fprog prog;
|
|
|
|
assert(syscall_filter);
|
|
|
|
/* First: count the syscalls to check for */
|
|
for (i = 0, n = 0; i < syscall_max(); i++)
|
|
if (syscall_filter[i >> 4] & (1 << (i & 31)))
|
|
n++;
|
|
|
|
/* Second: build the filter program from a header the syscall
|
|
* matches and the footer */
|
|
f = alloca(sizeof(struct sock_filter) * (ELEMENTSOF(header) + 2*n + ELEMENTSOF(footer)));
|
|
memcpy(f, header, sizeof(header));
|
|
|
|
for (i = 0, n = 0; i < syscall_max(); i++)
|
|
if (syscall_filter[i >> 4] & (1 << (i & 31))) {
|
|
struct sock_filter item[] = {
|
|
BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, i, 0, 1),
|
|
BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW)
|
|
};
|
|
|
|
assert_cc(ELEMENTSOF(item) == 2);
|
|
|
|
f[ELEMENTSOF(header) + 2*n] = item[0];
|
|
f[ELEMENTSOF(header) + 2*n+1] = item[1];
|
|
|
|
n++;
|
|
}
|
|
|
|
memcpy(f + (ELEMENTSOF(header) + 2*n), footer, sizeof(footer));
|
|
|
|
/* Third: install the filter */
|
|
zero(prog);
|
|
prog.len = ELEMENTSOF(header) + ELEMENTSOF(footer) + 2*n;
|
|
prog.filter = f;
|
|
if (prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog) < 0)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int exec_spawn(ExecCommand *command,
|
|
char **argv,
|
|
const ExecContext *context,
|
|
int fds[], unsigned n_fds,
|
|
char **environment,
|
|
bool apply_permissions,
|
|
bool apply_chroot,
|
|
bool apply_tty_stdin,
|
|
bool confirm_spawn,
|
|
CGroupBonding *cgroup_bondings,
|
|
CGroupAttribute *cgroup_attributes,
|
|
const char *cgroup_suffix,
|
|
const char *unit_id,
|
|
int idle_pipe[2],
|
|
pid_t *ret) {
|
|
|
|
pid_t pid;
|
|
int r;
|
|
char *line;
|
|
int socket_fd;
|
|
char _cleanup_strv_free_ **files_env = NULL;
|
|
|
|
assert(command);
|
|
assert(context);
|
|
assert(ret);
|
|
assert(fds || n_fds <= 0);
|
|
|
|
if (context->std_input == EXEC_INPUT_SOCKET ||
|
|
context->std_output == EXEC_OUTPUT_SOCKET ||
|
|
context->std_error == EXEC_OUTPUT_SOCKET) {
|
|
|
|
if (n_fds != 1)
|
|
return -EINVAL;
|
|
|
|
socket_fd = fds[0];
|
|
|
|
fds = NULL;
|
|
n_fds = 0;
|
|
} else
|
|
socket_fd = -1;
|
|
|
|
r = exec_context_load_environment(context, &files_env);
|
|
if (r < 0) {
|
|
log_struct(LOG_ERR,
|
|
"UNIT=%s", unit_id,
|
|
"MESSAGE=Failed to load environment files: %s", strerror(-r),
|
|
"ERRNO=%d", -r,
|
|
NULL);
|
|
return r;
|
|
}
|
|
|
|
if (!argv)
|
|
argv = command->argv;
|
|
|
|
line = exec_command_line(argv);
|
|
if (!line)
|
|
return log_oom();
|
|
|
|
log_struct(LOG_DEBUG,
|
|
"UNIT=%s", unit_id,
|
|
"MESSAGE=About to execute %s", line,
|
|
NULL);
|
|
free(line);
|
|
|
|
r = cgroup_bonding_realize_list(cgroup_bondings);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
cgroup_attribute_apply_list(cgroup_attributes, cgroup_bondings);
|
|
|
|
pid = fork();
|
|
if (pid < 0)
|
|
return -errno;
|
|
|
|
if (pid == 0) {
|
|
int i, err;
|
|
sigset_t ss;
|
|
const char *username = NULL, *home = NULL;
|
|
uid_t uid = (uid_t) -1;
|
|
gid_t gid = (gid_t) -1;
|
|
char _cleanup_strv_free_ **our_env = NULL, **pam_env = NULL,
|
|
**final_env = NULL, **final_argv = NULL;
|
|
unsigned n_env = 0;
|
|
bool set_access = false;
|
|
|
|
/* child */
|
|
|
|
rename_process_from_path(command->path);
|
|
|
|
/* We reset exactly these signals, since they are the
|
|
* only ones we set to SIG_IGN in the main daemon. All
|
|
* others we leave untouched because we set them to
|
|
* SIG_DFL or a valid handler initially, both of which
|
|
* will be demoted to SIG_DFL. */
|
|
default_signals(SIGNALS_CRASH_HANDLER,
|
|
SIGNALS_IGNORE, -1);
|
|
|
|
if (context->ignore_sigpipe)
|
|
ignore_signals(SIGPIPE, -1);
|
|
|
|
assert_se(sigemptyset(&ss) == 0);
|
|
if (sigprocmask(SIG_SETMASK, &ss, NULL) < 0) {
|
|
err = -errno;
|
|
r = EXIT_SIGNAL_MASK;
|
|
goto fail_child;
|
|
}
|
|
|
|
if (idle_pipe) {
|
|
if (idle_pipe[1] >= 0)
|
|
close_nointr_nofail(idle_pipe[1]);
|
|
if (idle_pipe[0] >= 0) {
|
|
fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT_USEC);
|
|
close_nointr_nofail(idle_pipe[0]);
|
|
}
|
|
}
|
|
|
|
/* Close sockets very early to make sure we don't
|
|
* block init reexecution because it cannot bind its
|
|
* sockets */
|
|
log_forget_fds();
|
|
err = close_all_fds(socket_fd >= 0 ? &socket_fd : fds,
|
|
socket_fd >= 0 ? 1 : n_fds);
|
|
if (err < 0) {
|
|
r = EXIT_FDS;
|
|
goto fail_child;
|
|
}
|
|
|
|
if (!context->same_pgrp)
|
|
if (setsid() < 0) {
|
|
err = -errno;
|
|
r = EXIT_SETSID;
|
|
goto fail_child;
|
|
}
|
|
|
|
if (context->tcpwrap_name) {
|
|
if (socket_fd >= 0)
|
|
if (!socket_tcpwrap(socket_fd, context->tcpwrap_name)) {
|
|
err = -EACCES;
|
|
r = EXIT_TCPWRAP;
|
|
goto fail_child;
|
|
}
|
|
|
|
for (i = 0; i < (int) n_fds; i++) {
|
|
if (!socket_tcpwrap(fds[i], context->tcpwrap_name)) {
|
|
err = -EACCES;
|
|
r = EXIT_TCPWRAP;
|
|
goto fail_child;
|
|
}
|
|
}
|
|
}
|
|
|
|
exec_context_tty_reset(context);
|
|
|
|
if (confirm_spawn) {
|
|
char response;
|
|
|
|
err = ask_for_confirmation(&response, argv);
|
|
if (err == -ETIMEDOUT)
|
|
write_confirm_message("Confirmation question timed out, assuming positive response.\n");
|
|
else if (err < 0)
|
|
write_confirm_message("Couldn't ask confirmation question, assuming positive response: %s\n", strerror(-err));
|
|
else if (response == 's') {
|
|
write_confirm_message("Skipping execution.\n");
|
|
err = -ECANCELED;
|
|
r = EXIT_CONFIRM;
|
|
goto fail_child;
|
|
} else if (response == 'n') {
|
|
write_confirm_message("Failing execution.\n");
|
|
err = r = 0;
|
|
goto fail_child;
|
|
}
|
|
}
|
|
|
|
/* If a socket is connected to STDIN/STDOUT/STDERR, we
|
|
* must sure to drop O_NONBLOCK */
|
|
if (socket_fd >= 0)
|
|
fd_nonblock(socket_fd, false);
|
|
|
|
err = setup_input(context, socket_fd, apply_tty_stdin);
|
|
if (err < 0) {
|
|
r = EXIT_STDIN;
|
|
goto fail_child;
|
|
}
|
|
|
|
err = setup_output(context, socket_fd, path_get_file_name(command->path), unit_id, apply_tty_stdin);
|
|
if (err < 0) {
|
|
r = EXIT_STDOUT;
|
|
goto fail_child;
|
|
}
|
|
|
|
err = setup_error(context, socket_fd, path_get_file_name(command->path), unit_id, apply_tty_stdin);
|
|
if (err < 0) {
|
|
r = EXIT_STDERR;
|
|
goto fail_child;
|
|
}
|
|
|
|
if (cgroup_bondings) {
|
|
err = cgroup_bonding_install_list(cgroup_bondings, 0, cgroup_suffix);
|
|
if (err < 0) {
|
|
r = EXIT_CGROUP;
|
|
goto fail_child;
|
|
}
|
|
}
|
|
|
|
if (context->oom_score_adjust_set) {
|
|
char t[16];
|
|
|
|
snprintf(t, sizeof(t), "%i", context->oom_score_adjust);
|
|
char_array_0(t);
|
|
|
|
if (write_one_line_file("/proc/self/oom_score_adj", t) < 0) {
|
|
err = -errno;
|
|
r = EXIT_OOM_ADJUST;
|
|
goto fail_child;
|
|
}
|
|
}
|
|
|
|
if (context->nice_set)
|
|
if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) {
|
|
err = -errno;
|
|
r = EXIT_NICE;
|
|
goto fail_child;
|
|
}
|
|
|
|
if (context->cpu_sched_set) {
|
|
struct sched_param param;
|
|
|
|
zero(param);
|
|
param.sched_priority = context->cpu_sched_priority;
|
|
|
|
if (sched_setscheduler(0, context->cpu_sched_policy |
|
|
(context->cpu_sched_reset_on_fork ? SCHED_RESET_ON_FORK : 0), ¶m) < 0) {
|
|
err = -errno;
|
|
r = EXIT_SETSCHEDULER;
|
|
goto fail_child;
|
|
}
|
|
}
|
|
|
|
if (context->cpuset)
|
|
if (sched_setaffinity(0, CPU_ALLOC_SIZE(context->cpuset_ncpus), context->cpuset) < 0) {
|
|
err = -errno;
|
|
r = EXIT_CPUAFFINITY;
|
|
goto fail_child;
|
|
}
|
|
|
|
if (context->ioprio_set)
|
|
if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) {
|
|
err = -errno;
|
|
r = EXIT_IOPRIO;
|
|
goto fail_child;
|
|
}
|
|
|
|
if (context->timer_slack_nsec != (nsec_t) -1)
|
|
if (prctl(PR_SET_TIMERSLACK, context->timer_slack_nsec) < 0) {
|
|
err = -errno;
|
|
r = EXIT_TIMERSLACK;
|
|
goto fail_child;
|
|
}
|
|
|
|
if (context->utmp_id)
|
|
utmp_put_init_process(context->utmp_id, getpid(), getsid(0), context->tty_path);
|
|
|
|
if (context->user) {
|
|
username = context->user;
|
|
err = get_user_creds(&username, &uid, &gid, &home, NULL);
|
|
if (err < 0) {
|
|
r = EXIT_USER;
|
|
goto fail_child;
|
|
}
|
|
|
|
if (is_terminal_input(context->std_input)) {
|
|
err = chown_terminal(STDIN_FILENO, uid);
|
|
if (err < 0) {
|
|
r = EXIT_STDIN;
|
|
goto fail_child;
|
|
}
|
|
}
|
|
|
|
if (cgroup_bondings && context->control_group_modify) {
|
|
err = cgroup_bonding_set_group_access_list(cgroup_bondings, 0755, uid, gid);
|
|
if (err >= 0)
|
|
err = cgroup_bonding_set_task_access_list(cgroup_bondings, 0644, uid, gid, context->control_group_persistent);
|
|
if (err < 0) {
|
|
r = EXIT_CGROUP;
|
|
goto fail_child;
|
|
}
|
|
|
|
set_access = true;
|
|
}
|
|
}
|
|
|
|
if (cgroup_bondings && !set_access && context->control_group_persistent >= 0) {
|
|
err = cgroup_bonding_set_task_access_list(cgroup_bondings, (mode_t) -1, (uid_t) -1, (uid_t) -1, context->control_group_persistent);
|
|
if (err < 0) {
|
|
r = EXIT_CGROUP;
|
|
goto fail_child;
|
|
}
|
|
}
|
|
|
|
if (apply_permissions) {
|
|
err = enforce_groups(context, username, gid);
|
|
if (err < 0) {
|
|
r = EXIT_GROUP;
|
|
goto fail_child;
|
|
}
|
|
}
|
|
|
|
umask(context->umask);
|
|
|
|
#ifdef HAVE_PAM
|
|
if (apply_permissions && context->pam_name && username) {
|
|
err = setup_pam(context->pam_name, username, uid, context->tty_path, &pam_env, fds, n_fds);
|
|
if (err < 0) {
|
|
r = EXIT_PAM;
|
|
goto fail_child;
|
|
}
|
|
}
|
|
#endif
|
|
if (context->private_network) {
|
|
if (unshare(CLONE_NEWNET) < 0) {
|
|
err = -errno;
|
|
r = EXIT_NETWORK;
|
|
goto fail_child;
|
|
}
|
|
|
|
loopback_setup();
|
|
}
|
|
|
|
if (strv_length(context->read_write_dirs) > 0 ||
|
|
strv_length(context->read_only_dirs) > 0 ||
|
|
strv_length(context->inaccessible_dirs) > 0 ||
|
|
context->mount_flags != 0 ||
|
|
context->private_tmp) {
|
|
err = setup_namespace(context->read_write_dirs,
|
|
context->read_only_dirs,
|
|
context->inaccessible_dirs,
|
|
context->private_tmp,
|
|
context->mount_flags);
|
|
if (err < 0) {
|
|
r = EXIT_NAMESPACE;
|
|
goto fail_child;
|
|
}
|
|
}
|
|
|
|
if (apply_chroot) {
|
|
if (context->root_directory)
|
|
if (chroot(context->root_directory) < 0) {
|
|
err = -errno;
|
|
r = EXIT_CHROOT;
|
|
goto fail_child;
|
|
}
|
|
|
|
if (chdir(context->working_directory ? context->working_directory : "/") < 0) {
|
|
err = -errno;
|
|
r = EXIT_CHDIR;
|
|
goto fail_child;
|
|
}
|
|
} else {
|
|
char _cleanup_free_ *d = NULL;
|
|
|
|
if (asprintf(&d, "%s/%s",
|
|
context->root_directory ? context->root_directory : "",
|
|
context->working_directory ? context->working_directory : "") < 0) {
|
|
err = -ENOMEM;
|
|
r = EXIT_MEMORY;
|
|
goto fail_child;
|
|
}
|
|
|
|
if (chdir(d) < 0) {
|
|
err = -errno;
|
|
r = EXIT_CHDIR;
|
|
goto fail_child;
|
|
}
|
|
}
|
|
|
|
/* We repeat the fd closing here, to make sure that
|
|
* nothing is leaked from the PAM modules */
|
|
err = close_all_fds(fds, n_fds);
|
|
if (err >= 0)
|
|
err = shift_fds(fds, n_fds);
|
|
if (err >= 0)
|
|
err = flags_fds(fds, n_fds, context->non_blocking);
|
|
if (err < 0) {
|
|
r = EXIT_FDS;
|
|
goto fail_child;
|
|
}
|
|
|
|
if (apply_permissions) {
|
|
|
|
for (i = 0; i < RLIMIT_NLIMITS; i++) {
|
|
if (!context->rlimit[i])
|
|
continue;
|
|
|
|
if (setrlimit_closest(i, context->rlimit[i]) < 0) {
|
|
err = -errno;
|
|
r = EXIT_LIMITS;
|
|
goto fail_child;
|
|
}
|
|
}
|
|
|
|
if (context->capability_bounding_set_drop) {
|
|
err = capability_bounding_set_drop(context->capability_bounding_set_drop, false);
|
|
if (err < 0) {
|
|
r = EXIT_CAPABILITIES;
|
|
goto fail_child;
|
|
}
|
|
}
|
|
|
|
if (context->user) {
|
|
err = enforce_user(context, uid);
|
|
if (err < 0) {
|
|
r = EXIT_USER;
|
|
goto fail_child;
|
|
}
|
|
}
|
|
|
|
/* PR_GET_SECUREBITS is not privileged, while
|
|
* PR_SET_SECUREBITS is. So to suppress
|
|
* potential EPERMs we'll try not to call
|
|
* PR_SET_SECUREBITS unless necessary. */
|
|
if (prctl(PR_GET_SECUREBITS) != context->secure_bits)
|
|
if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) {
|
|
err = -errno;
|
|
r = EXIT_SECUREBITS;
|
|
goto fail_child;
|
|
}
|
|
|
|
if (context->capabilities)
|
|
if (cap_set_proc(context->capabilities) < 0) {
|
|
err = -errno;
|
|
r = EXIT_CAPABILITIES;
|
|
goto fail_child;
|
|
}
|
|
|
|
if (context->no_new_privileges)
|
|
if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) {
|
|
err = -errno;
|
|
r = EXIT_NO_NEW_PRIVILEGES;
|
|
goto fail_child;
|
|
}
|
|
|
|
if (context->syscall_filter) {
|
|
err = apply_seccomp(context->syscall_filter);
|
|
if (err < 0) {
|
|
r = EXIT_SECCOMP;
|
|
goto fail_child;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!(our_env = new0(char*, 7))) {
|
|
err = -ENOMEM;
|
|
r = EXIT_MEMORY;
|
|
goto fail_child;
|
|
}
|
|
|
|
if (n_fds > 0)
|
|
if (asprintf(our_env + n_env++, "LISTEN_PID=%lu", (unsigned long) getpid()) < 0 ||
|
|
asprintf(our_env + n_env++, "LISTEN_FDS=%u", n_fds) < 0) {
|
|
err = -ENOMEM;
|
|
r = EXIT_MEMORY;
|
|
goto fail_child;
|
|
}
|
|
|
|
if (home)
|
|
if (asprintf(our_env + n_env++, "HOME=%s", home) < 0) {
|
|
err = -ENOMEM;
|
|
r = EXIT_MEMORY;
|
|
goto fail_child;
|
|
}
|
|
|
|
if (username)
|
|
if (asprintf(our_env + n_env++, "LOGNAME=%s", username) < 0 ||
|
|
asprintf(our_env + n_env++, "USER=%s", username) < 0) {
|
|
err = -ENOMEM;
|
|
r = EXIT_MEMORY;
|
|
goto fail_child;
|
|
}
|
|
|
|
if (is_terminal_input(context->std_input) ||
|
|
context->std_output == EXEC_OUTPUT_TTY ||
|
|
context->std_error == EXEC_OUTPUT_TTY)
|
|
if (!(our_env[n_env++] = strdup(default_term_for_tty(tty_path(context))))) {
|
|
err = -ENOMEM;
|
|
r = EXIT_MEMORY;
|
|
goto fail_child;
|
|
}
|
|
|
|
assert(n_env <= 7);
|
|
|
|
if (!(final_env = strv_env_merge(
|
|
5,
|
|
environment,
|
|
our_env,
|
|
context->environment,
|
|
files_env,
|
|
pam_env,
|
|
NULL))) {
|
|
err = -ENOMEM;
|
|
r = EXIT_MEMORY;
|
|
goto fail_child;
|
|
}
|
|
|
|
if (!(final_argv = replace_env_argv(argv, final_env))) {
|
|
err = -ENOMEM;
|
|
r = EXIT_MEMORY;
|
|
goto fail_child;
|
|
}
|
|
|
|
final_env = strv_env_clean(final_env);
|
|
|
|
execve(command->path, final_argv, final_env);
|
|
err = -errno;
|
|
r = EXIT_EXEC;
|
|
|
|
fail_child:
|
|
if (r != 0) {
|
|
log_open();
|
|
log_struct(LOG_ERR, MESSAGE_ID(SD_MESSAGE_SPAWN_FAILED),
|
|
"EXECUTABLE=%s", command->path,
|
|
"MESSAGE=Failed at step %s spawning %s: %s",
|
|
exit_status_to_string(r, EXIT_STATUS_SYSTEMD),
|
|
command->path, strerror(-err),
|
|
"ERRNO=%d", -err,
|
|
NULL);
|
|
log_close();
|
|
}
|
|
|
|
_exit(r);
|
|
}
|
|
|
|
log_struct(LOG_DEBUG,
|
|
"UNIT=%s", unit_id,
|
|
"MESSAGE=Forked %s as %lu",
|
|
command->path, (unsigned long) pid,
|
|
NULL);
|
|
|
|
/* We add the new process to the cgroup both in the child (so
|
|
* that we can be sure that no user code is ever executed
|
|
* outside of the cgroup) and in the parent (so that we can be
|
|
* sure that when we kill the cgroup the process will be
|
|
* killed too). */
|
|
if (cgroup_bondings)
|
|
cgroup_bonding_install_list(cgroup_bondings, pid, cgroup_suffix);
|
|
|
|
exec_status_start(&command->exec_status, pid);
|
|
|
|
*ret = pid;
|
|
return 0;
|
|
}
|
|
|
|
void exec_context_init(ExecContext *c) {
|
|
assert(c);
|
|
|
|
c->umask = 0022;
|
|
c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0);
|
|
c->cpu_sched_policy = SCHED_OTHER;
|
|
c->syslog_priority = LOG_DAEMON|LOG_INFO;
|
|
c->syslog_level_prefix = true;
|
|
c->control_group_persistent = -1;
|
|
c->ignore_sigpipe = true;
|
|
c->timer_slack_nsec = (nsec_t) -1;
|
|
}
|
|
|
|
void exec_context_done(ExecContext *c) {
|
|
unsigned l;
|
|
|
|
assert(c);
|
|
|
|
strv_free(c->environment);
|
|
c->environment = NULL;
|
|
|
|
strv_free(c->environment_files);
|
|
c->environment_files = NULL;
|
|
|
|
for (l = 0; l < ELEMENTSOF(c->rlimit); l++) {
|
|
free(c->rlimit[l]);
|
|
c->rlimit[l] = NULL;
|
|
}
|
|
|
|
free(c->working_directory);
|
|
c->working_directory = NULL;
|
|
free(c->root_directory);
|
|
c->root_directory = NULL;
|
|
|
|
free(c->tty_path);
|
|
c->tty_path = NULL;
|
|
|
|
free(c->tcpwrap_name);
|
|
c->tcpwrap_name = NULL;
|
|
|
|
free(c->syslog_identifier);
|
|
c->syslog_identifier = NULL;
|
|
|
|
free(c->user);
|
|
c->user = NULL;
|
|
|
|
free(c->group);
|
|
c->group = NULL;
|
|
|
|
strv_free(c->supplementary_groups);
|
|
c->supplementary_groups = NULL;
|
|
|
|
free(c->pam_name);
|
|
c->pam_name = NULL;
|
|
|
|
if (c->capabilities) {
|
|
cap_free(c->capabilities);
|
|
c->capabilities = NULL;
|
|
}
|
|
|
|
strv_free(c->read_only_dirs);
|
|
c->read_only_dirs = NULL;
|
|
|
|
strv_free(c->read_write_dirs);
|
|
c->read_write_dirs = NULL;
|
|
|
|
strv_free(c->inaccessible_dirs);
|
|
c->inaccessible_dirs = NULL;
|
|
|
|
if (c->cpuset)
|
|
CPU_FREE(c->cpuset);
|
|
|
|
free(c->utmp_id);
|
|
c->utmp_id = NULL;
|
|
|
|
free(c->syscall_filter);
|
|
c->syscall_filter = NULL;
|
|
}
|
|
|
|
void exec_command_done(ExecCommand *c) {
|
|
assert(c);
|
|
|
|
free(c->path);
|
|
c->path = NULL;
|
|
|
|
strv_free(c->argv);
|
|
c->argv = NULL;
|
|
}
|
|
|
|
void exec_command_done_array(ExecCommand *c, unsigned n) {
|
|
unsigned i;
|
|
|
|
for (i = 0; i < n; i++)
|
|
exec_command_done(c+i);
|
|
}
|
|
|
|
void exec_command_free_list(ExecCommand *c) {
|
|
ExecCommand *i;
|
|
|
|
while ((i = c)) {
|
|
LIST_REMOVE(ExecCommand, command, c, i);
|
|
exec_command_done(i);
|
|
free(i);
|
|
}
|
|
}
|
|
|
|
void exec_command_free_array(ExecCommand **c, unsigned n) {
|
|
unsigned i;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
exec_command_free_list(c[i]);
|
|
c[i] = NULL;
|
|
}
|
|
}
|
|
|
|
int exec_context_load_environment(const ExecContext *c, char ***l) {
|
|
char **i, **r = NULL;
|
|
|
|
assert(c);
|
|
assert(l);
|
|
|
|
STRV_FOREACH(i, c->environment_files) {
|
|
char *fn;
|
|
int k;
|
|
bool ignore = false;
|
|
char **p;
|
|
|
|
fn = *i;
|
|
|
|
if (fn[0] == '-') {
|
|
ignore = true;
|
|
fn ++;
|
|
}
|
|
|
|
if (!path_is_absolute(fn)) {
|
|
|
|
if (ignore)
|
|
continue;
|
|
|
|
strv_free(r);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if ((k = load_env_file(fn, &p)) < 0) {
|
|
|
|
if (ignore)
|
|
continue;
|
|
|
|
strv_free(r);
|
|
return k;
|
|
}
|
|
|
|
if (r == NULL)
|
|
r = p;
|
|
else {
|
|
char **m;
|
|
|
|
m = strv_env_merge(2, r, p);
|
|
strv_free(r);
|
|
strv_free(p);
|
|
|
|
if (!m)
|
|
return -ENOMEM;
|
|
|
|
r = m;
|
|
}
|
|
}
|
|
|
|
*l = r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void strv_fprintf(FILE *f, char **l) {
|
|
char **g;
|
|
|
|
assert(f);
|
|
|
|
STRV_FOREACH(g, l)
|
|
fprintf(f, " %s", *g);
|
|
}
|
|
|
|
void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
|
|
char ** e;
|
|
unsigned i;
|
|
|
|
assert(c);
|
|
assert(f);
|
|
|
|
if (!prefix)
|
|
prefix = "";
|
|
|
|
fprintf(f,
|
|
"%sUMask: %04o\n"
|
|
"%sWorkingDirectory: %s\n"
|
|
"%sRootDirectory: %s\n"
|
|
"%sNonBlocking: %s\n"
|
|
"%sPrivateTmp: %s\n"
|
|
"%sControlGroupModify: %s\n"
|
|
"%sControlGroupPersistent: %s\n"
|
|
"%sPrivateNetwork: %s\n"
|
|
"%sIgnoreSIGPIPE: %s\n",
|
|
prefix, c->umask,
|
|
prefix, c->working_directory ? c->working_directory : "/",
|
|
prefix, c->root_directory ? c->root_directory : "/",
|
|
prefix, yes_no(c->non_blocking),
|
|
prefix, yes_no(c->private_tmp),
|
|
prefix, yes_no(c->control_group_modify),
|
|
prefix, yes_no(c->control_group_persistent),
|
|
prefix, yes_no(c->private_network),
|
|
prefix, yes_no(c->ignore_sigpipe));
|
|
|
|
STRV_FOREACH(e, c->environment)
|
|
fprintf(f, "%sEnvironment: %s\n", prefix, *e);
|
|
|
|
STRV_FOREACH(e, c->environment_files)
|
|
fprintf(f, "%sEnvironmentFile: %s\n", prefix, *e);
|
|
|
|
if (c->tcpwrap_name)
|
|
fprintf(f,
|
|
"%sTCPWrapName: %s\n",
|
|
prefix, c->tcpwrap_name);
|
|
|
|
if (c->nice_set)
|
|
fprintf(f,
|
|
"%sNice: %i\n",
|
|
prefix, c->nice);
|
|
|
|
if (c->oom_score_adjust_set)
|
|
fprintf(f,
|
|
"%sOOMScoreAdjust: %i\n",
|
|
prefix, c->oom_score_adjust);
|
|
|
|
for (i = 0; i < RLIM_NLIMITS; i++)
|
|
if (c->rlimit[i])
|
|
fprintf(f, "%s%s: %llu\n", prefix, rlimit_to_string(i), (unsigned long long) c->rlimit[i]->rlim_max);
|
|
|
|
if (c->ioprio_set) {
|
|
char *class_str;
|
|
int r;
|
|
|
|
r = ioprio_class_to_string_alloc(IOPRIO_PRIO_CLASS(c->ioprio), &class_str);
|
|
if (r < 0)
|
|
class_str = NULL;
|
|
fprintf(f,
|
|
"%sIOSchedulingClass: %s\n"
|
|
"%sIOPriority: %i\n",
|
|
prefix, strna(class_str),
|
|
prefix, (int) IOPRIO_PRIO_DATA(c->ioprio));
|
|
free(class_str);
|
|
}
|
|
|
|
if (c->cpu_sched_set) {
|
|
char *policy_str;
|
|
int r;
|
|
|
|
r = sched_policy_to_string_alloc(c->cpu_sched_policy, &policy_str);
|
|
if (r < 0)
|
|
policy_str = NULL;
|
|
fprintf(f,
|
|
"%sCPUSchedulingPolicy: %s\n"
|
|
"%sCPUSchedulingPriority: %i\n"
|
|
"%sCPUSchedulingResetOnFork: %s\n",
|
|
prefix, strna(policy_str),
|
|
prefix, c->cpu_sched_priority,
|
|
prefix, yes_no(c->cpu_sched_reset_on_fork));
|
|
free(policy_str);
|
|
}
|
|
|
|
if (c->cpuset) {
|
|
fprintf(f, "%sCPUAffinity:", prefix);
|
|
for (i = 0; i < c->cpuset_ncpus; i++)
|
|
if (CPU_ISSET_S(i, CPU_ALLOC_SIZE(c->cpuset_ncpus), c->cpuset))
|
|
fprintf(f, " %i", i);
|
|
fputs("\n", f);
|
|
}
|
|
|
|
if (c->timer_slack_nsec != (nsec_t) -1)
|
|
fprintf(f, "%sTimerSlackNSec: %lu\n", prefix, (unsigned long)c->timer_slack_nsec);
|
|
|
|
fprintf(f,
|
|
"%sStandardInput: %s\n"
|
|
"%sStandardOutput: %s\n"
|
|
"%sStandardError: %s\n",
|
|
prefix, exec_input_to_string(c->std_input),
|
|
prefix, exec_output_to_string(c->std_output),
|
|
prefix, exec_output_to_string(c->std_error));
|
|
|
|
if (c->tty_path)
|
|
fprintf(f,
|
|
"%sTTYPath: %s\n"
|
|
"%sTTYReset: %s\n"
|
|
"%sTTYVHangup: %s\n"
|
|
"%sTTYVTDisallocate: %s\n",
|
|
prefix, c->tty_path,
|
|
prefix, yes_no(c->tty_reset),
|
|
prefix, yes_no(c->tty_vhangup),
|
|
prefix, yes_no(c->tty_vt_disallocate));
|
|
|
|
if (c->std_output == EXEC_OUTPUT_SYSLOG || c->std_output == EXEC_OUTPUT_KMSG || c->std_output == EXEC_OUTPUT_JOURNAL ||
|
|
c->std_output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || c->std_output == EXEC_OUTPUT_KMSG_AND_CONSOLE || c->std_output == EXEC_OUTPUT_JOURNAL_AND_CONSOLE ||
|
|
c->std_error == EXEC_OUTPUT_SYSLOG || c->std_error == EXEC_OUTPUT_KMSG || c->std_error == EXEC_OUTPUT_JOURNAL ||
|
|
c->std_error == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || c->std_error == EXEC_OUTPUT_KMSG_AND_CONSOLE || c->std_error == EXEC_OUTPUT_JOURNAL_AND_CONSOLE) {
|
|
char *fac_str, *lvl_str;
|
|
int r;
|
|
|
|
r = log_facility_unshifted_to_string_alloc(c->syslog_priority >> 3, &fac_str);
|
|
if (r < 0)
|
|
fac_str = NULL;
|
|
|
|
r = log_level_to_string_alloc(LOG_PRI(c->syslog_priority), &lvl_str);
|
|
if (r < 0)
|
|
lvl_str = NULL;
|
|
|
|
fprintf(f,
|
|
"%sSyslogFacility: %s\n"
|
|
"%sSyslogLevel: %s\n",
|
|
prefix, strna(fac_str),
|
|
prefix, strna(lvl_str));
|
|
free(lvl_str);
|
|
free(fac_str);
|
|
}
|
|
|
|
if (c->capabilities) {
|
|
char *t;
|
|
if ((t = cap_to_text(c->capabilities, NULL))) {
|
|
fprintf(f, "%sCapabilities: %s\n",
|
|
prefix, t);
|
|
cap_free(t);
|
|
}
|
|
}
|
|
|
|
if (c->secure_bits)
|
|
fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n",
|
|
prefix,
|
|
(c->secure_bits & SECURE_KEEP_CAPS) ? " keep-caps" : "",
|
|
(c->secure_bits & SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "",
|
|
(c->secure_bits & SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "",
|
|
(c->secure_bits & SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "",
|
|
(c->secure_bits & SECURE_NOROOT) ? " noroot" : "",
|
|
(c->secure_bits & SECURE_NOROOT_LOCKED) ? "noroot-locked" : "");
|
|
|
|
if (c->capability_bounding_set_drop) {
|
|
unsigned long l;
|
|
fprintf(f, "%sCapabilityBoundingSet:", prefix);
|
|
|
|
for (l = 0; l <= cap_last_cap(); l++)
|
|
if (!(c->capability_bounding_set_drop & ((uint64_t) 1ULL << (uint64_t) l))) {
|
|
char *t;
|
|
|
|
if ((t = cap_to_name(l))) {
|
|
fprintf(f, " %s", t);
|
|
cap_free(t);
|
|
}
|
|
}
|
|
|
|
fputs("\n", f);
|
|
}
|
|
|
|
if (c->user)
|
|
fprintf(f, "%sUser: %s\n", prefix, c->user);
|
|
if (c->group)
|
|
fprintf(f, "%sGroup: %s\n", prefix, c->group);
|
|
|
|
if (strv_length(c->supplementary_groups) > 0) {
|
|
fprintf(f, "%sSupplementaryGroups:", prefix);
|
|
strv_fprintf(f, c->supplementary_groups);
|
|
fputs("\n", f);
|
|
}
|
|
|
|
if (c->pam_name)
|
|
fprintf(f, "%sPAMName: %s\n", prefix, c->pam_name);
|
|
|
|
if (strv_length(c->read_write_dirs) > 0) {
|
|
fprintf(f, "%sReadWriteDirs:", prefix);
|
|
strv_fprintf(f, c->read_write_dirs);
|
|
fputs("\n", f);
|
|
}
|
|
|
|
if (strv_length(c->read_only_dirs) > 0) {
|
|
fprintf(f, "%sReadOnlyDirs:", prefix);
|
|
strv_fprintf(f, c->read_only_dirs);
|
|
fputs("\n", f);
|
|
}
|
|
|
|
if (strv_length(c->inaccessible_dirs) > 0) {
|
|
fprintf(f, "%sInaccessibleDirs:", prefix);
|
|
strv_fprintf(f, c->inaccessible_dirs);
|
|
fputs("\n", f);
|
|
}
|
|
|
|
if (c->utmp_id)
|
|
fprintf(f,
|
|
"%sUtmpIdentifier: %s\n",
|
|
prefix, c->utmp_id);
|
|
}
|
|
|
|
void exec_status_start(ExecStatus *s, pid_t pid) {
|
|
assert(s);
|
|
|
|
zero(*s);
|
|
s->pid = pid;
|
|
dual_timestamp_get(&s->start_timestamp);
|
|
}
|
|
|
|
void exec_status_exit(ExecStatus *s, ExecContext *context, pid_t pid, int code, int status) {
|
|
assert(s);
|
|
|
|
if (s->pid && s->pid != pid)
|
|
zero(*s);
|
|
|
|
s->pid = pid;
|
|
dual_timestamp_get(&s->exit_timestamp);
|
|
|
|
s->code = code;
|
|
s->status = status;
|
|
|
|
if (context) {
|
|
if (context->utmp_id)
|
|
utmp_put_dead_process(context->utmp_id, pid, code, status);
|
|
|
|
exec_context_tty_reset(context);
|
|
}
|
|
}
|
|
|
|
void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) {
|
|
char buf[FORMAT_TIMESTAMP_MAX];
|
|
|
|
assert(s);
|
|
assert(f);
|
|
|
|
if (!prefix)
|
|
prefix = "";
|
|
|
|
if (s->pid <= 0)
|
|
return;
|
|
|
|
fprintf(f,
|
|
"%sPID: %lu\n",
|
|
prefix, (unsigned long) s->pid);
|
|
|
|
if (s->start_timestamp.realtime > 0)
|
|
fprintf(f,
|
|
"%sStart Timestamp: %s\n",
|
|
prefix, format_timestamp(buf, sizeof(buf), s->start_timestamp.realtime));
|
|
|
|
if (s->exit_timestamp.realtime > 0)
|
|
fprintf(f,
|
|
"%sExit Timestamp: %s\n"
|
|
"%sExit Code: %s\n"
|
|
"%sExit Status: %i\n",
|
|
prefix, format_timestamp(buf, sizeof(buf), s->exit_timestamp.realtime),
|
|
prefix, sigchld_code_to_string(s->code),
|
|
prefix, s->status);
|
|
}
|
|
|
|
char *exec_command_line(char **argv) {
|
|
size_t k;
|
|
char *n, *p, **a;
|
|
bool first = true;
|
|
|
|
assert(argv);
|
|
|
|
k = 1;
|
|
STRV_FOREACH(a, argv)
|
|
k += strlen(*a)+3;
|
|
|
|
if (!(n = new(char, k)))
|
|
return NULL;
|
|
|
|
p = n;
|
|
STRV_FOREACH(a, argv) {
|
|
|
|
if (!first)
|
|
*(p++) = ' ';
|
|
else
|
|
first = false;
|
|
|
|
if (strpbrk(*a, WHITESPACE)) {
|
|
*(p++) = '\'';
|
|
p = stpcpy(p, *a);
|
|
*(p++) = '\'';
|
|
} else
|
|
p = stpcpy(p, *a);
|
|
|
|
}
|
|
|
|
*p = 0;
|
|
|
|
/* FIXME: this doesn't really handle arguments that have
|
|
* spaces and ticks in them */
|
|
|
|
return n;
|
|
}
|
|
|
|
void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) {
|
|
char *p2;
|
|
const char *prefix2;
|
|
|
|
char *cmd;
|
|
|
|
assert(c);
|
|
assert(f);
|
|
|
|
if (!prefix)
|
|
prefix = "";
|
|
p2 = strappend(prefix, "\t");
|
|
prefix2 = p2 ? p2 : prefix;
|
|
|
|
cmd = exec_command_line(c->argv);
|
|
|
|
fprintf(f,
|
|
"%sCommand Line: %s\n",
|
|
prefix, cmd ? cmd : strerror(ENOMEM));
|
|
|
|
free(cmd);
|
|
|
|
exec_status_dump(&c->exec_status, f, prefix2);
|
|
|
|
free(p2);
|
|
}
|
|
|
|
void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) {
|
|
assert(f);
|
|
|
|
if (!prefix)
|
|
prefix = "";
|
|
|
|
LIST_FOREACH(command, c, c)
|
|
exec_command_dump(c, f, prefix);
|
|
}
|
|
|
|
void exec_command_append_list(ExecCommand **l, ExecCommand *e) {
|
|
ExecCommand *end;
|
|
|
|
assert(l);
|
|
assert(e);
|
|
|
|
if (*l) {
|
|
/* It's kind of important, that we keep the order here */
|
|
LIST_FIND_TAIL(ExecCommand, command, *l, end);
|
|
LIST_INSERT_AFTER(ExecCommand, command, *l, end, e);
|
|
} else
|
|
*l = e;
|
|
}
|
|
|
|
int exec_command_set(ExecCommand *c, const char *path, ...) {
|
|
va_list ap;
|
|
char **l, *p;
|
|
|
|
assert(c);
|
|
assert(path);
|
|
|
|
va_start(ap, path);
|
|
l = strv_new_ap(path, ap);
|
|
va_end(ap);
|
|
|
|
if (!l)
|
|
return -ENOMEM;
|
|
|
|
if (!(p = strdup(path))) {
|
|
strv_free(l);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
free(c->path);
|
|
c->path = p;
|
|
|
|
strv_free(c->argv);
|
|
c->argv = l;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const char* const exec_input_table[_EXEC_INPUT_MAX] = {
|
|
[EXEC_INPUT_NULL] = "null",
|
|
[EXEC_INPUT_TTY] = "tty",
|
|
[EXEC_INPUT_TTY_FORCE] = "tty-force",
|
|
[EXEC_INPUT_TTY_FAIL] = "tty-fail",
|
|
[EXEC_INPUT_SOCKET] = "socket"
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput);
|
|
|
|
static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = {
|
|
[EXEC_OUTPUT_INHERIT] = "inherit",
|
|
[EXEC_OUTPUT_NULL] = "null",
|
|
[EXEC_OUTPUT_TTY] = "tty",
|
|
[EXEC_OUTPUT_SYSLOG] = "syslog",
|
|
[EXEC_OUTPUT_SYSLOG_AND_CONSOLE] = "syslog+console",
|
|
[EXEC_OUTPUT_KMSG] = "kmsg",
|
|
[EXEC_OUTPUT_KMSG_AND_CONSOLE] = "kmsg+console",
|
|
[EXEC_OUTPUT_JOURNAL] = "journal",
|
|
[EXEC_OUTPUT_JOURNAL_AND_CONSOLE] = "journal+console",
|
|
[EXEC_OUTPUT_SOCKET] = "socket"
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput);
|