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c53158818d
systemd/src/core/execute.c
Lennart Poettering ac0930c892 namespace: rework namespace support 
- don't use pivot_root() anymore, just reuse root hierarchy
- first create all mounts, then mark them read-only so that we get the
  right behaviour when people want writable mounts inside of
  read-only mounts
- don't pass invalid combinations of MS_ constants to the kernel
2012-08-13 15:27:04 +02:00

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/*-*- 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 <assert.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/prctl.h>
#include <linux/sched.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <grp.h>
#include <pwd.h>
#include <sys/mount.h>
#include <linux/fs.h>
#include <linux/oom.h>
#include <sys/poll.h>
#include <linux/seccomp-bpf.h>
#ifdef HAVE_PAM
#include <security/pam_appl.h>
#endif
#include "execute.h"
#include "strv.h"
#include "macro.h"
#include "capability.h"
#include "util.h"
#include "log.h"
#include "ioprio.h"
#include "securebits.h"
#include "cgroup.h"
#include "namespace.h"
#include "tcpwrap.h"
#include "exit-status.h"
#include "missing.h"
#include "utmp-wtmp.h"
#include "def.h"
#include "loopback-setup.h"
#include "path-util.h"
#include "syscall-list.h"
#define IDLE_TIMEOUT_USEC (5*USEC_PER_SEC)
/* This assumes there is a 'tty' group */
#define TTY_MODE 0620
static int shift_fds(int fds[], unsigned n_fds) {
int start, restart_from;
if (n_fds <= 0)
return 0;
/* Modifies the fds array! (sorts it) */
assert(fds);
start = 0;
for (;;) {
int i;
restart_from = -1;
for (i = start; i < (int) n_fds; i++) {
int nfd;
/* Already at right index? */
if (fds[i] == i+3)
continue;
if ((nfd = fcntl(fds[i], F_DUPFD, i+3)) < 0)
return -errno;
close_nointr_nofail(fds[i]);
fds[i] = nfd;
/* Hmm, the fd we wanted isn't free? Then
* let's remember that and try again from here*/
if (nfd != i+3 && restart_from < 0)
restart_from = i;
}
if (restart_from < 0)
break;
start = restart_from;
}
return 0;
}
static int flags_fds(const int fds[], unsigned n_fds, bool nonblock) {
unsigned i;
int r;
if (n_fds <= 0)
return 0;
assert(fds);
/* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */
for (i = 0; i < n_fds; i++) {
if ((r = fd_nonblock(fds[i], nonblock)) < 0)
return r;
/* We unconditionally drop FD_CLOEXEC from the fds,
* since after all we want to pass these fds to our
* children */
if ((r = fd_cloexec(fds[i], false)) < 0)
return r;
}
return 0;
}
static const char *tty_path(const ExecContext *context) {
assert(context);
if (context->tty_path)
return context->tty_path;
return "/dev/console";
}
void exec_context_tty_reset(const ExecContext *context) {
assert(context);
if (context->tty_vhangup)
terminal_vhangup(tty_path(context));
if (context->tty_reset)
reset_terminal(tty_path(context));
if (context->tty_vt_disallocate && context->tty_path)
vt_disallocate(context->tty_path);
}
static int open_null_as(int flags, int nfd) {
int fd, r;
assert(nfd >= 0);
if ((fd = open("/dev/null", flags|O_NOCTTY)) < 0)
return -errno;
if (fd != nfd) {
r = dup2(fd, nfd) < 0 ? -errno : nfd;
close_nointr_nofail(fd);
} else
r = nfd;
return r;
}
static int connect_logger_as(const ExecContext *context, ExecOutput output, const char *ident, const char *unit_id, int nfd) {
int fd, r;
union sockaddr_union sa;
assert(context);
assert(output < _EXEC_OUTPUT_MAX);
assert(ident);
assert(nfd >= 0);
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd < 0)
return -errno;
zero(sa);
sa.un.sun_family = AF_UNIX;
strncpy(sa.un.sun_path, "/run/systemd/journal/stdout", sizeof(sa.un.sun_path));
r = connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path));
if (r < 0) {
close_nointr_nofail(fd);
return -errno;
}
if (shutdown(fd, SHUT_RD) < 0) {
close_nointr_nofail(fd);
return -errno;
}
dprintf(fd,
"%s\n"
"%s\n"
"%i\n"
"%i\n"
"%i\n"
"%i\n"
"%i\n",
context->syslog_identifier ? context->syslog_identifier : ident,
unit_id,
context->syslog_priority,
!!context->syslog_level_prefix,
output == EXEC_OUTPUT_SYSLOG || output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE,
output == EXEC_OUTPUT_KMSG || output == EXEC_OUTPUT_KMSG_AND_CONSOLE,
output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || output == EXEC_OUTPUT_KMSG_AND_CONSOLE || output == EXEC_OUTPUT_JOURNAL_AND_CONSOLE);
if (fd != nfd) {
r = dup2(fd, nfd) < 0 ? -errno : nfd;
close_nointr_nofail(fd);
} else
r = nfd;
return r;
}
static int open_terminal_as(const char *path, mode_t mode, int nfd) {
int fd, r;
assert(path);
assert(nfd >= 0);
if ((fd = open_terminal(path, mode | O_NOCTTY)) < 0)
return fd;
if (fd != nfd) {
r = dup2(fd, nfd) < 0 ? -errno : nfd;
close_nointr_nofail(fd);
} else
r = nfd;
return r;
}
static bool is_terminal_input(ExecInput i) {
return
i == EXEC_INPUT_TTY ||
i == EXEC_INPUT_TTY_FORCE ||
i == EXEC_INPUT_TTY_FAIL;
}
static int fixup_input(ExecInput std_input, int socket_fd, bool apply_tty_stdin) {
if (is_terminal_input(std_input) && !apply_tty_stdin)
return EXEC_INPUT_NULL;
if (std_input == EXEC_INPUT_SOCKET && socket_fd < 0)
return EXEC_INPUT_NULL;
return std_input;
}
static int fixup_output(ExecOutput std_output, int socket_fd) {
if (std_output == EXEC_OUTPUT_SOCKET && socket_fd < 0)
return EXEC_OUTPUT_INHERIT;
return std_output;
}
static int setup_input(const ExecContext *context, int socket_fd, bool apply_tty_stdin) {
ExecInput i;
assert(context);
i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
switch (i) {
case EXEC_INPUT_NULL:
return open_null_as(O_RDONLY, STDIN_FILENO);
case EXEC_INPUT_TTY:
case EXEC_INPUT_TTY_FORCE:
case EXEC_INPUT_TTY_FAIL: {
int fd, r;
if ((fd = acquire_terminal(
tty_path(context),
i == EXEC_INPUT_TTY_FAIL,
i == EXEC_INPUT_TTY_FORCE,
false,
(usec_t) -1)) < 0)
return fd;
if (fd != STDIN_FILENO) {
r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
close_nointr_nofail(fd);
} else
r = STDIN_FILENO;
return r;
}
case EXEC_INPUT_SOCKET:
return dup2(socket_fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
default:
assert_not_reached("Unknown input type");
}
}
static int setup_output(const ExecContext *context, int socket_fd, const char *ident, const char *unit_id, bool apply_tty_stdin) {
ExecOutput o;
ExecInput i;
assert(context);
assert(ident);
i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
o = fixup_output(context->std_output, socket_fd);
/* This expects the input is already set up */
switch (o) {
case EXEC_OUTPUT_INHERIT:
/* If input got downgraded, inherit the original value */
if (i == EXEC_INPUT_NULL && is_terminal_input(context->std_input))
return open_terminal_as(tty_path(context), O_WRONLY, STDOUT_FILENO);
/* If the input is connected to anything that's not a /dev/null, inherit that... */
if (i != EXEC_INPUT_NULL)
return dup2(STDIN_FILENO, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
/* If we are not started from PID 1 we just inherit STDOUT from our parent process. */
if (getppid() != 1)
return STDOUT_FILENO;
/* We need to open /dev/null here anew, to get the
* right access mode. So we fall through */
case EXEC_OUTPUT_NULL:
return open_null_as(O_WRONLY, STDOUT_FILENO);
case EXEC_OUTPUT_TTY:
if (is_terminal_input(i))
return dup2(STDIN_FILENO, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
/* We don't reset the terminal if this is just about output */
return open_terminal_as(tty_path(context), O_WRONLY, STDOUT_FILENO);
case EXEC_OUTPUT_SYSLOG:
case EXEC_OUTPUT_SYSLOG_AND_CONSOLE:
case EXEC_OUTPUT_KMSG:
case EXEC_OUTPUT_KMSG_AND_CONSOLE:
case EXEC_OUTPUT_JOURNAL:
case EXEC_OUTPUT_JOURNAL_AND_CONSOLE:
return connect_logger_as(context, o, ident, unit_id, STDOUT_FILENO);
case EXEC_OUTPUT_SOCKET:
assert(socket_fd >= 0);
return dup2(socket_fd, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
default:
assert_not_reached("Unknown output type");
}
}
static int setup_error(const ExecContext *context, int socket_fd, const char *ident, const char *unit_id, bool apply_tty_stdin) {
ExecOutput o, e;
ExecInput i;
assert(context);
assert(ident);
i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
o = fixup_output(context->std_output, socket_fd);
e = fixup_output(context->std_error, socket_fd);
/* This expects the input and output are already set up */
/* Don't change the stderr file descriptor if we inherit all
* the way and are not on a tty */
if (e == EXEC_OUTPUT_INHERIT &&
o == EXEC_OUTPUT_INHERIT &&
i == EXEC_INPUT_NULL &&
!is_terminal_input(context->std_input) &&
getppid () != 1)
return STDERR_FILENO;
/* Duplicate from stdout if possible */
if (e == o || e == EXEC_OUTPUT_INHERIT)
return dup2(STDOUT_FILENO, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
switch (e) {
case EXEC_OUTPUT_NULL:
return open_null_as(O_WRONLY, STDERR_FILENO);
case EXEC_OUTPUT_TTY:
if (is_terminal_input(i))
return dup2(STDIN_FILENO, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
/* We don't reset the terminal if this is just about output */
return open_terminal_as(tty_path(context), O_WRONLY, STDERR_FILENO);
case EXEC_OUTPUT_SYSLOG:
case EXEC_OUTPUT_SYSLOG_AND_CONSOLE:
case EXEC_OUTPUT_KMSG:
case EXEC_OUTPUT_KMSG_AND_CONSOLE:
case EXEC_OUTPUT_JOURNAL:
case EXEC_OUTPUT_JOURNAL_AND_CONSOLE:
return connect_logger_as(context, e, ident, unit_id, STDERR_FILENO);
case EXEC_OUTPUT_SOCKET:
assert(socket_fd >= 0);
return dup2(socket_fd, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
default:
assert_not_reached("Unknown error type");
}
}
static int chown_terminal(int fd, uid_t uid) {
struct stat st;
assert(fd >= 0);
/* This might fail. What matters are the results. */
(void) fchown(fd, uid, -1);
(void) fchmod(fd, TTY_MODE);
if (fstat(fd, &st) < 0)
return -errno;
if (st.st_uid != uid || (st.st_mode & 0777) != TTY_MODE)
return -EPERM;
return 0;
}
static int setup_confirm_stdio(int *_saved_stdin,
int *_saved_stdout) {
int fd = -1, saved_stdin, saved_stdout = -1, r;
assert(_saved_stdin);
assert(_saved_stdout);
saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3);
if (saved_stdin < 0)
return -errno;
saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3);
if (saved_stdout < 0) {
r = errno;
goto fail;
}
fd = acquire_terminal(
"/dev/console",
false,
false,
false,
DEFAULT_CONFIRM_USEC);
if (fd < 0) {
r = fd;
goto fail;
}
r = chown_terminal(fd, getuid());
if (r < 0)
goto fail;
if (dup2(fd, STDIN_FILENO) < 0) {
r = -errno;
goto fail;
}
if (dup2(fd, STDOUT_FILENO) < 0) {
r = -errno;
goto fail;
}
if (fd >= 2)
close_nointr_nofail(fd);
*_saved_stdin = saved_stdin;
*_saved_stdout = saved_stdout;
return 0;
fail:
if (saved_stdout >= 0)
close_nointr_nofail(saved_stdout);
if (saved_stdin >= 0)
close_nointr_nofail(saved_stdin);
if (fd >= 0)
close_nointr_nofail(fd);
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 **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;
if ((r = exec_context_load_environment(context, &files_env)) < 0) {
log_error("Failed to load environment files: %s", strerror(-r));
return r;
}
if (!argv)
argv = command->argv;
line = exec_command_line(argv);
if (!line) {
r = -ENOMEM;
goto fail_parent;
}
log_debug("About to execute: %s", line);
free(line);
r = cgroup_bonding_realize_list(cgroup_bondings);
if (r < 0)
goto fail_parent;
cgroup_attribute_apply_list(cgroup_attributes, cgroup_bondings);
if ((pid = fork()) < 0) {
r = -errno;
goto fail_parent;
}
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 **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), &param) < 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 (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 *d;
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;
free(d);
r = EXIT_CHDIR;
goto fail_child;
}
free(d);
}
/* 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_warning("Failed at step %s spawning %s: %s",
exit_status_to_string(r, EXIT_STATUS_SYSTEMD),
command->path, strerror(-err));
}
strv_free(our_env);
strv_free(final_env);
strv_free(pam_env);
strv_free(files_env);
strv_free(final_argv);
_exit(r);
}
strv_free(files_env);
/* 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);
log_debug("Forked %s as %lu", command->path, (unsigned long) pid);
exec_status_start(&command->exec_status, pid);
*ret = pid;
return 0;
fail_parent:
strv_free(files_env);
return r;
}
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)
fprintf(f,
"%sIOSchedulingClass: %s\n"
"%sIOPriority: %i\n",
prefix, ioprio_class_to_string(IOPRIO_PRIO_CLASS(c->ioprio)),
prefix, (int) IOPRIO_PRIO_DATA(c->ioprio));
if (c->cpu_sched_set)
fprintf(f,
"%sCPUSchedulingPolicy: %s\n"
"%sCPUSchedulingPriority: %i\n"
"%sCPUSchedulingResetOnFork: %s\n",
prefix, sched_policy_to_string(c->cpu_sched_policy),
prefix, c->cpu_sched_priority,
prefix, yes_no(c->cpu_sched_reset_on_fork));
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)
fprintf(f,
"%sSyslogFacility: %s\n"
"%sSyslogLevel: %s\n",
prefix, log_facility_unshifted_to_string(c->syslog_priority >> 3),
prefix, log_level_to_string(LOG_PRI(c->syslog_priority)));
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);
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