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-rw-r--r--src/core/execute.c2132
1 files changed, 2132 insertions, 0 deletions
diff --git a/src/core/execute.c b/src/core/execute.c
new file mode 100644
index 0000000000..e236d38e0f
--- /dev/null
+++ b/src/core/execute.c
@@ -0,0 +1,2132 @@
+/*-*- 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"
+#include "sd-id128.h"
+#include "sd-messages.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 _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), &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 (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);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-12-21 10:22:15 +0000