+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <signal.h>
-#include <sched.h>
-#include <unistd.h>
-#include <sys/types.h>
-#include <sys/syscall.h>
-#include <sys/mount.h>
-#include <sys/wait.h>
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-#include <errno.h>
-#include <sys/prctl.h>
-#include <sys/capability.h>
-#include <getopt.h>
-#include <sys/epoll.h>
-#include <termios.h>
-#include <sys/signalfd.h>
-#include <grp.h>
-#include <linux/fs.h>
-
-#include <systemd/sd-daemon.h>
-
-#include "log.h"
-#include "util.h"
-#include "mkdir.h"
-#include "audit.h"
-#include "missing.h"
-#include "cgroup-util.h"
-#include "strv.h"
-#include "loopback-setup.h"
-
-static char *arg_directory = NULL;
-static char *arg_user = NULL;
-static char **arg_controllers = NULL;
-static bool arg_private_network = false;
-
-static int help(void) {
-
- printf("%s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"
- "Spawn a minimal namespace container for debugging, testing and building.\n\n"
- " -h --help Show this help\n"
- " -D --directory=NAME Root directory for the container\n"
- " -u --user=USER Run the command under specified user or uid\n"
- " -C --controllers=LIST Put the container in specified comma-separated cgroup hierarchies\n"
- " --private-network Disable network in container\n",
- program_invocation_short_name);
-
- return 0;
-}
-
-static int parse_argv(int argc, char *argv[]) {
-
- enum {
- ARG_PRIVATE_NETWORK = 0x100
- };
-
- static const struct option options[] = {
- { "help", no_argument, NULL, 'h' },
- { "directory", required_argument, NULL, 'D' },
- { "user", required_argument, NULL, 'u' },
- { "controllers", required_argument, NULL, 'C' },
- { "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK },
- { NULL, 0, NULL, 0 }
- };
-
- int c;
-
- assert(argc >= 0);
- assert(argv);
-
- while ((c = getopt_long(argc, argv, "+hD:u:C:", options, NULL)) >= 0) {
-
- switch (c) {
-
- case 'h':
- help();
- return 0;
-
- case 'D':
- free(arg_directory);
- if (!(arg_directory = strdup(optarg))) {
- log_error("Failed to duplicate root directory.");
- return -ENOMEM;
- }
-
- break;
-
- case 'u':
- free(arg_user);
- if (!(arg_user = strdup(optarg))) {
- log_error("Failed to duplicate user name.");
- return -ENOMEM;
- }
-
- break;
-
- case 'C':
- strv_free(arg_controllers);
- arg_controllers = strv_split(optarg, ",");
- if (!arg_controllers) {
- log_error("Failed to split controllers list.");
- return -ENOMEM;
- }
- strv_uniq(arg_controllers);
-
- break;
-
- case ARG_PRIVATE_NETWORK:
- arg_private_network = true;
- break;
-
- case '?':
- return -EINVAL;
-
- default:
- log_error("Unknown option code %c", c);
- return -EINVAL;
- }
- }
-
- return 1;
-}
-
-static int mount_all(const char *dest) {
-
- typedef struct MountPoint {
- const char *what;
- const char *where;
- const char *type;
- const char *options;
- unsigned long flags;
- bool fatal;
- } MountPoint;
-
- static const MountPoint mount_table[] = {
- { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
- { "/proc/sys", "/proc/sys", "bind", NULL, MS_BIND, true }, /* Bind mount first */
- { "/proc/sys", "/proc/sys", "bind", NULL, MS_BIND|MS_RDONLY|MS_REMOUNT, true }, /* Then, make it r/o */
- { "/sys", "/sys", "bind", NULL, MS_BIND, true }, /* Bind mount first */
- { "/sys", "/sys", "bind", NULL, MS_BIND|MS_RDONLY|MS_REMOUNT, true }, /* Then, make it r/o */
- { "tmpfs", "/dev", "tmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, true },
- { "/dev/pts", "/dev/pts", "bind", NULL, MS_BIND, true },
- { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true },
-#ifdef HAVE_SELINUX
- { "/sys/fs/selinux", "/sys/fs/selinux", "bind", NULL, MS_BIND, false }, /* Bind mount first */
- { "/sys/fs/selinux", "/sys/fs/selinux", "bind", NULL, MS_BIND|MS_RDONLY|MS_REMOUNT, false }, /* Then, make it r/o */
-#endif
- };
-
- unsigned k;
- int r = 0;
- char *where;
-
- for (k = 0; k < ELEMENTSOF(mount_table); k++) {
- int t;
-
- if (asprintf(&where, "%s/%s", dest, mount_table[k].where) < 0) {
- log_error("Out of memory");
-
- if (r == 0)
- r = -ENOMEM;
-
- break;
- }
-
- t = path_is_mount_point(where, false);
- if (t < 0) {
- log_error("Failed to detect whether %s is a mount point: %s", where, strerror(-t));
- free(where);
-
- if (r == 0)
- r = t;
-
- continue;
- }
-
- mkdir_p(where, 0755);
-
- if (mount(mount_table[k].what,
- where,
- mount_table[k].type,
- mount_table[k].flags,
- mount_table[k].options) < 0 &&
- mount_table[k].fatal) {
-
- log_error("mount(%s) failed: %m", where);
-
- if (r == 0)
- r = -errno;
- }
-
- free(where);
- }
-
- /* Fix the timezone, if possible */
- if (asprintf(&where, "%s/etc/localtime", dest) >= 0) {
-
- if (mount("/etc/localtime", where, "bind", MS_BIND, NULL) >= 0)
- mount("/etc/localtime", where, "bind", MS_BIND|MS_REMOUNT|MS_RDONLY, NULL);
-
- free(where);
- }
-
- if (asprintf(&where, "%s/etc/timezone", dest) >= 0) {
-
- if (mount("/etc/timezone", where, "bind", MS_BIND, NULL) >= 0)
- mount("/etc/timezone", where, "bind", MS_BIND|MS_REMOUNT|MS_RDONLY, NULL);
-
- free(where);
- }
-
- if (asprintf(&where, "%s/proc/kmsg", dest) >= 0) {
- mount("/dev/null", where, "bind", MS_BIND, NULL);
- free(where);
- }
-
- return r;
-}
-
-static int copy_devnodes(const char *dest, const char *console) {
-
- static const char devnodes[] =
- "null\0"
- "zero\0"
- "full\0"
- "random\0"
- "urandom\0"
- "tty\0"
- "ptmx\0"
- "kmsg\0"
- "rtc0\0";
-
- const char *d;
- int r = 0, k;
- mode_t u;
- struct stat st;
- char *from = NULL, *to = NULL;
-
- assert(dest);
- assert(console);
-
- u = umask(0000);
-
- NULSTR_FOREACH(d, devnodes) {
- from = to = NULL;
-
- asprintf(&from, "/dev/%s", d);
- asprintf(&to, "%s/dev/%s", dest, d);
-
- if (!from || !to) {
- log_error("Failed to allocate devnode path");
-
- free(from);
- free(to);
-
- from = to = NULL;
-
- if (r == 0)
- r = -ENOMEM;
-
- break;
- }
-
- if (stat(from, &st) < 0) {
-
- if (errno != ENOENT) {
- log_error("Failed to stat %s: %m", from);
- if (r == 0)
- r = -errno;
- }
-
- } else if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) {
-
- log_error("%s is not a char or block device, cannot copy.", from);
- if (r == 0)
- r = -EIO;
-
- } else if (mknod(to, st.st_mode, st.st_rdev) < 0) {
-
- log_error("mknod(%s) failed: %m", dest);
- if (r == 0)
- r = -errno;
- }
-
- free(from);
- free(to);
- }
-
- if (stat(console, &st) < 0) {
-
- log_error("Failed to stat %s: %m", console);
- if (r == 0)
- r = -errno;
-
- goto finish;
-
- } else if (!S_ISCHR(st.st_mode)) {
-
- log_error("/dev/console is not a char device.");
- if (r == 0)
- r = -EIO;
-
- goto finish;
- }
-
- if (asprintf(&to, "%s/dev/console", dest) < 0) {
-
- log_error("Out of memory");
- if (r == 0)
- r = -ENOMEM;
-
- goto finish;
- }
-
- /* We need to bind mount the right tty to /dev/console since
- * ptys can only exist on pts file systems. To have something
- * to bind mount things on we create a device node first, that
- * has the right major/minor (note that the major minor
- * doesn't actually matter here, since we mount it over
- * anyway). */
-
- if (mknod(to, (st.st_mode & ~07777) | 0600, st.st_rdev) < 0)
- log_error("mknod for /dev/console failed: %m");
-
- if (mount(console, to, "bind", MS_BIND, NULL) < 0) {
- log_error("bind mount for /dev/console failed: %m");
-
- if (r == 0)
- r = -errno;
- }
-
- free(to);
-
- if ((k = chmod_and_chown(console, 0600, 0, 0)) < 0) {
- log_error("Failed to correct access mode for TTY: %s", strerror(-k));
-
- if (r == 0)
- r = k;
- }
-
-finish:
- umask(u);
-
- return r;
-}
-
-static int drop_capabilities(void) {
- static const unsigned long retain[] = {
- CAP_CHOWN,
- CAP_DAC_OVERRIDE,
- CAP_DAC_READ_SEARCH,
- CAP_FOWNER,
- CAP_FSETID,
- CAP_IPC_OWNER,
- CAP_KILL,
- CAP_LEASE,
- CAP_LINUX_IMMUTABLE,
- CAP_NET_BIND_SERVICE,
- CAP_NET_BROADCAST,
- CAP_NET_RAW,
- CAP_SETGID,
- CAP_SETFCAP,
- CAP_SETPCAP,
- CAP_SETUID,
- CAP_SYS_ADMIN,
- CAP_SYS_CHROOT,
- CAP_SYS_NICE,
- CAP_SYS_PTRACE,
- CAP_SYS_TTY_CONFIG
- };
-
- unsigned long l;
-
- for (l = 0; l <= cap_last_cap(); l++) {
- unsigned i;
-
- for (i = 0; i < ELEMENTSOF(retain); i++)
- if (retain[i] == l)
- break;
-
- if (i < ELEMENTSOF(retain))
- continue;
-
- if (prctl(PR_CAPBSET_DROP, l) < 0) {
- log_error("PR_CAPBSET_DROP failed: %m");
- return -errno;
- }
- }
-
- return 0;
-}
-
-static int is_os_tree(const char *path) {
- int r;
- char *p;
- /* We use /bin/sh as flag file if something is an OS */
-
- if (asprintf(&p, "%s/bin/sh", path) < 0)
- return -ENOMEM;
-
- r = access(p, F_OK);
- free(p);
-
- return r < 0 ? 0 : 1;
-}
-
-static int process_pty(int master, sigset_t *mask) {
-
- char in_buffer[LINE_MAX], out_buffer[LINE_MAX];
- size_t in_buffer_full = 0, out_buffer_full = 0;
- struct epoll_event stdin_ev, stdout_ev, master_ev, signal_ev;
- bool stdin_readable = false, stdout_writable = false, master_readable = false, master_writable = false;
- int ep = -1, signal_fd = -1, r;
-
- fd_nonblock(STDIN_FILENO, 1);
- fd_nonblock(STDOUT_FILENO, 1);
- fd_nonblock(master, 1);
-
- if ((signal_fd = signalfd(-1, mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0) {
- log_error("signalfd(): %m");
- r = -errno;
- goto finish;
- }
-
- if ((ep = epoll_create1(EPOLL_CLOEXEC)) < 0) {
- log_error("Failed to create epoll: %m");
- r = -errno;
- goto finish;
- }
-
- zero(stdin_ev);
- stdin_ev.events = EPOLLIN|EPOLLET;
- stdin_ev.data.fd = STDIN_FILENO;
-
- zero(stdout_ev);
- stdout_ev.events = EPOLLOUT|EPOLLET;
- stdout_ev.data.fd = STDOUT_FILENO;
-
- zero(master_ev);
- master_ev.events = EPOLLIN|EPOLLOUT|EPOLLET;
- master_ev.data.fd = master;
-
- zero(signal_ev);
- signal_ev.events = EPOLLIN;
- signal_ev.data.fd = signal_fd;
-
- if (epoll_ctl(ep, EPOLL_CTL_ADD, STDIN_FILENO, &stdin_ev) < 0 ||
- epoll_ctl(ep, EPOLL_CTL_ADD, STDOUT_FILENO, &stdout_ev) < 0 ||
- epoll_ctl(ep, EPOLL_CTL_ADD, master, &master_ev) < 0 ||
- epoll_ctl(ep, EPOLL_CTL_ADD, signal_fd, &signal_ev) < 0) {
- log_error("Failed to regiser fds in epoll: %m");
- r = -errno;
- goto finish;
- }
-
- for (;;) {
- struct epoll_event ev[16];
- ssize_t k;
- int i, nfds;
-
- if ((nfds = epoll_wait(ep, ev, ELEMENTSOF(ev), -1)) < 0) {
-
- if (errno == EINTR || errno == EAGAIN)
- continue;
-
- log_error("epoll_wait(): %m");
- r = -errno;
- goto finish;
- }
-
- assert(nfds >= 1);
-
- for (i = 0; i < nfds; i++) {
- if (ev[i].data.fd == STDIN_FILENO) {
-
- if (ev[i].events & (EPOLLIN|EPOLLHUP))
- stdin_readable = true;
-
- } else if (ev[i].data.fd == STDOUT_FILENO) {
-
- if (ev[i].events & (EPOLLOUT|EPOLLHUP))
- stdout_writable = true;
-
- } else if (ev[i].data.fd == master) {
-
- if (ev[i].events & (EPOLLIN|EPOLLHUP))
- master_readable = true;
-
- if (ev[i].events & (EPOLLOUT|EPOLLHUP))
- master_writable = true;
-
- } else if (ev[i].data.fd == signal_fd) {
- struct signalfd_siginfo sfsi;
- ssize_t n;
-
- if ((n = read(signal_fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
-
- if (n >= 0) {
- log_error("Failed to read from signalfd: invalid block size");
- r = -EIO;
- goto finish;
- }
-
- if (errno != EINTR && errno != EAGAIN) {
- log_error("Failed to read from signalfd: %m");
- r = -errno;
- goto finish;
- }
- } else {
-
- if (sfsi.ssi_signo == SIGWINCH) {
- struct winsize ws;
-
- /* The window size changed, let's forward that. */
- if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) >= 0)
- ioctl(master, TIOCSWINSZ, &ws);
- } else {
- r = 0;
- goto finish;
- }
- }
- }
- }
-
- while ((stdin_readable && in_buffer_full <= 0) ||
- (master_writable && in_buffer_full > 0) ||
- (master_readable && out_buffer_full <= 0) ||
- (stdout_writable && out_buffer_full > 0)) {
-
- if (stdin_readable && in_buffer_full < LINE_MAX) {
-
- if ((k = read(STDIN_FILENO, in_buffer + in_buffer_full, LINE_MAX - in_buffer_full)) < 0) {
-
- if (errno == EAGAIN || errno == EPIPE || errno == ECONNRESET || errno == EIO)
- stdin_readable = false;
- else {
- log_error("read(): %m");
- r = -errno;
- goto finish;
- }
- } else
- in_buffer_full += (size_t) k;
- }
-
- if (master_writable && in_buffer_full > 0) {
-
- if ((k = write(master, in_buffer, in_buffer_full)) < 0) {
-
- if (errno == EAGAIN || errno == EPIPE || errno == ECONNRESET || errno == EIO)
- master_writable = false;
- else {
- log_error("write(): %m");
- r = -errno;
- goto finish;
- }
-
- } else {
- assert(in_buffer_full >= (size_t) k);
- memmove(in_buffer, in_buffer + k, in_buffer_full - k);
- in_buffer_full -= k;
- }
- }
-
- if (master_readable && out_buffer_full < LINE_MAX) {
-
- if ((k = read(master, out_buffer + out_buffer_full, LINE_MAX - out_buffer_full)) < 0) {
-
- if (errno == EAGAIN || errno == EPIPE || errno == ECONNRESET || errno == EIO)
- master_readable = false;
- else {
- log_error("read(): %m");
- r = -errno;
- goto finish;
- }
- } else
- out_buffer_full += (size_t) k;
- }
-
- if (stdout_writable && out_buffer_full > 0) {
-
- if ((k = write(STDOUT_FILENO, out_buffer, out_buffer_full)) < 0) {
-
- if (errno == EAGAIN || errno == EPIPE || errno == ECONNRESET || errno == EIO)
- stdout_writable = false;
- else {
- log_error("write(): %m");
- r = -errno;
- goto finish;
- }
-
- } else {
- assert(out_buffer_full >= (size_t) k);
- memmove(out_buffer, out_buffer + k, out_buffer_full - k);
- out_buffer_full -= k;
- }
- }
- }
- }
-
-finish:
- if (ep >= 0)
- close_nointr_nofail(ep);
-
- if (signal_fd >= 0)
- close_nointr_nofail(signal_fd);
-
- return r;
-}
-
-int main(int argc, char *argv[]) {
- pid_t pid = 0;
- int r = EXIT_FAILURE, k;
- char *oldcg = NULL, *newcg = NULL;
- char **controller = NULL;
- int master = -1;
- const char *console = NULL;
- struct termios saved_attr, raw_attr;
- sigset_t mask;
- bool saved_attr_valid = false;
- struct winsize ws;
-
- log_parse_environment();
- log_open();
-
- if ((r = parse_argv(argc, argv)) <= 0)
- goto finish;
-
- if (arg_directory) {
- char *p;
-
- p = path_make_absolute_cwd(arg_directory);
- free(arg_directory);
- arg_directory = p;
- } else
- arg_directory = get_current_dir_name();
-
- if (!arg_directory) {
- log_error("Failed to determine path");
- goto finish;
- }
-
- path_kill_slashes(arg_directory);
-
- if (geteuid() != 0) {
- log_error("Need to be root.");
- goto finish;
- }
-
- if (sd_booted() <= 0) {
- log_error("Not running on a systemd system.");
- goto finish;
- }
-
- if (path_equal(arg_directory, "/")) {
- log_error("Spawning container on root directory not supported.");
- goto finish;
- }
-
- if (is_os_tree(arg_directory) <= 0) {
- log_error("Directory %s doesn't look like an OS root directory. Refusing.", arg_directory);
- goto finish;
- }
-
- if ((k = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, &oldcg)) < 0) {
- log_error("Failed to determine current cgroup: %s", strerror(-k));
- goto finish;
- }
-
- if (asprintf(&newcg, "%s/nspawn-%lu", oldcg, (unsigned long) getpid()) < 0) {
- log_error("Failed to allocate cgroup path.");
- goto finish;
- }
-
- k = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, newcg, 0);
- if (k < 0) {
- log_error("Failed to create cgroup: %s", strerror(-k));
- goto finish;
- }
-
- STRV_FOREACH(controller,arg_controllers) {
- k = cg_create_and_attach(*controller, newcg, 0);
- if (k < 0)
- log_warning("Failed to create cgroup in controller %s: %s", *controller, strerror(-k));
- }
-
- if ((master = posix_openpt(O_RDWR|O_NOCTTY|O_CLOEXEC|O_NDELAY)) < 0) {
- log_error("Failed to acquire pseudo tty: %m");
- goto finish;
- }
-
- if (!(console = ptsname(master))) {
- log_error("Failed to determine tty name: %m");
- goto finish;
- }
-
- log_info("Spawning namespace container on %s (console is %s).", arg_directory, console);
-
- if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) >= 0)
- ioctl(master, TIOCSWINSZ, &ws);
-
- if (unlockpt(master) < 0) {
- log_error("Failed to unlock tty: %m");
- goto finish;
- }
-
- if (tcgetattr(STDIN_FILENO, &saved_attr) < 0) {
- log_error("Failed to get terminal attributes: %m");
- goto finish;
- }
-
- saved_attr_valid = true;
-
- raw_attr = saved_attr;
- cfmakeraw(&raw_attr);
- raw_attr.c_lflag &= ~ECHO;
-
- if (tcsetattr(STDIN_FILENO, TCSANOW, &raw_attr) < 0) {
- log_error("Failed to set terminal attributes: %m");
- goto finish;
- }
-
- assert_se(sigemptyset(&mask) == 0);
- sigset_add_many(&mask, SIGCHLD, SIGWINCH, SIGTERM, SIGINT, -1);
- assert_se(sigprocmask(SIG_BLOCK, &mask, NULL) == 0);
-
- pid = syscall(__NR_clone, SIGCHLD|CLONE_NEWIPC|CLONE_NEWNS|CLONE_NEWPID|CLONE_NEWUTS|(arg_private_network ? CLONE_NEWNET : 0), NULL);
- if (pid < 0) {
- if (errno == EINVAL)
- log_error("clone() failed, do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in): %m");
- else
- log_error("clone() failed: %m");
-
- goto finish;
- }
-
- if (pid == 0) {
- /* child */
-
- const char *hn;
- const char *home = NULL;
- uid_t uid = (uid_t) -1;
- gid_t gid = (gid_t) -1;
- const char *envp[] = {
- "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
- "container=systemd-nspawn", /* LXC sets container=lxc, so follow the scheme here */
- NULL, /* TERM */
- NULL, /* HOME */
- NULL, /* USER */
- NULL, /* LOGNAME */
- NULL
- };
-
- envp[2] = strv_find_prefix(environ, "TERM=");
-
- close_nointr_nofail(master);
-
- close_nointr(STDIN_FILENO);
- close_nointr(STDOUT_FILENO);
- close_nointr(STDERR_FILENO);
-
- close_all_fds(NULL, 0);
-
- reset_all_signal_handlers();
-
- assert_se(sigemptyset(&mask) == 0);
- assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
-
- if (setsid() < 0)
- goto child_fail;
-
- if (prctl(PR_SET_PDEATHSIG, SIGKILL) < 0)
- goto child_fail;
-
- /* Mark / as private, in case somebody marked it shared */
- if (mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL) < 0)
- goto child_fail;
-
- if (mount_all(arg_directory) < 0)
- goto child_fail;
-
- if (copy_devnodes(arg_directory, console) < 0)
- goto child_fail;
-
- if (chdir(arg_directory) < 0) {
- log_error("chdir(%s) failed: %m", arg_directory);
- goto child_fail;
- }
-
- if (open_terminal("dev/console", O_RDWR) != STDIN_FILENO ||
- dup2(STDIN_FILENO, STDOUT_FILENO) != STDOUT_FILENO ||
- dup2(STDIN_FILENO, STDERR_FILENO) != STDERR_FILENO)
- goto child_fail;
-
- if (mount(arg_directory, "/", "bind", MS_BIND|MS_MOVE, NULL) < 0) {
- log_error("mount(MS_MOVE) failed: %m");
- goto child_fail;
- }
-
- if (chroot(".") < 0) {
- log_error("chroot() failed: %m");
- goto child_fail;
- }
-
- if (chdir("/") < 0) {
- log_error("chdir() failed: %m");
- goto child_fail;
- }
-
- umask(0022);
-
- loopback_setup();
-
- if (drop_capabilities() < 0)
- goto child_fail;
-
- if (arg_user) {
-
- if (get_user_creds((const char**)&arg_user, &uid, &gid, &home) < 0) {
- log_error("get_user_creds() failed: %m");
- goto child_fail;
- }
-
- if (mkdir_parents(home, 0775) < 0) {
- log_error("mkdir_parents() failed: %m");
- goto child_fail;
- }
-
- if (safe_mkdir(home, 0775, uid, gid) < 0) {
- log_error("safe_mkdir() failed: %m");
- goto child_fail;
- }
-
- if (initgroups((const char*)arg_user, gid) < 0) {
- log_error("initgroups() failed: %m");
- goto child_fail;
- }
-
- if (setresgid(gid, gid, gid) < 0) {
- log_error("setregid() failed: %m");
- goto child_fail;
- }
-
- if (setresuid(uid, uid, uid) < 0) {
- log_error("setreuid() failed: %m");
- goto child_fail;
- }
- }
-
- if ((asprintf((char**)(envp + 3), "HOME=%s", home? home: "/root") < 0) ||
- (asprintf((char**)(envp + 4), "USER=%s", arg_user? arg_user : "root") < 0) ||
- (asprintf((char**)(envp + 5), "LOGNAME=%s", arg_user? arg_user : "root") < 0)) {
- log_error("Out of memory");
- goto child_fail;
- }
-
- if ((hn = file_name_from_path(arg_directory)))
- sethostname(hn, strlen(hn));
-
- if (argc > optind)
- execvpe(argv[optind], argv + optind, (char**) envp);
- else {
- chdir(home ? home : "/root");
- execle("/bin/bash", "-bash", NULL, (char**) envp);
- }
-
- log_error("execv() failed: %m");
-
- child_fail:
- _exit(EXIT_FAILURE);
- }
-
- if (process_pty(master, &mask) < 0)
- goto finish;
-
- if (saved_attr_valid) {
- tcsetattr(STDIN_FILENO, TCSANOW, &saved_attr);
- saved_attr_valid = false;
- }
-
- r = wait_for_terminate_and_warn(argc > optind ? argv[optind] : "bash", pid);
-
- if (r < 0)
- r = EXIT_FAILURE;
-
-finish:
- if (saved_attr_valid)
- tcsetattr(STDIN_FILENO, TCSANOW, &saved_attr);
-
- if (master >= 0)
- close_nointr_nofail(master);
-
- if (oldcg)
- cg_attach(SYSTEMD_CGROUP_CONTROLLER, oldcg, 0);
-
- if (newcg)
- cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, newcg, true);
-
- free(arg_directory);
- strv_free(arg_controllers);
- free(oldcg);
- free(newcg);
-
- return r;
-}
~ianmdlvl / elogind.git / blobdiff