#include "af-list.h"
#include "mkdir.h"
#include "apparmor-util.h"
+#include "bus-kernel.h"
+#include "label.h"
#ifdef HAVE_SECCOMP
#include "seccomp-util.h"
#ifdef HAVE_SECCOMP
-static int apply_seccomp(ExecContext *c) {
+static int apply_seccomp(const ExecContext *c) {
uint32_t negative_action, action;
scmp_filter_ctx *seccomp;
Iterator i;
return r;
}
-static int apply_address_families(ExecContext *c) {
+static int apply_address_families(const ExecContext *c) {
scmp_filter_ctx *seccomp;
Iterator i;
int r;
}
static int build_environment(
- ExecContext *c,
+ const ExecContext *c,
unsigned n_fds,
usec_t watchdog_usec,
const char *home,
return 0;
}
-int exec_spawn(ExecCommand *command,
- char **argv,
- ExecContext *context,
- int fds[], unsigned n_fds,
- char **environment,
- bool apply_permissions,
- bool apply_chroot,
- bool apply_tty_stdin,
- bool confirm_spawn,
- CGroupControllerMask cgroup_supported,
- const char *cgroup_path,
- const char *runtime_prefix,
- const char *unit_id,
- usec_t watchdog_usec,
- int idle_pipe[4],
- ExecRuntime *runtime,
- pid_t *ret) {
-
- _cleanup_strv_free_ char **files_env = NULL;
- int socket_fd;
- char *line;
- pid_t pid;
- int r;
+static int exec_child(ExecCommand *command,
+ const ExecContext *context,
+ const ExecParameters *params,
+ ExecRuntime *runtime,
+ char **argv,
+ int socket_fd,
+ int *fds, unsigned n_fds,
+ char **files_env,
+ int *error) {
+
+ _cleanup_strv_free_ char **our_env = NULL, **pam_env = NULL, **final_env = NULL, **final_argv = NULL;
+ const char *username = NULL, *home = NULL, *shell = NULL;
+ unsigned n_dont_close = 0;
+ int dont_close[n_fds + 4];
+ uid_t uid = (uid_t) -1;
+ gid_t gid = (gid_t) -1;
+ int i, err;
assert(command);
assert(context);
- assert(ret);
- assert(fds || n_fds <= 0);
+ assert(params);
+ assert(error);
- if (context->std_input == EXEC_INPUT_SOCKET ||
- context->std_output == EXEC_OUTPUT_SOCKET ||
- context->std_error == EXEC_OUTPUT_SOCKET) {
+ rename_process_from_path(command->path);
- if (n_fds != 1)
- return -EINVAL;
+ /* 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);
- socket_fd = fds[0];
+ if (context->ignore_sigpipe)
+ ignore_signals(SIGPIPE, -1);
- fds = NULL;
- n_fds = 0;
- } else
- socket_fd = -1;
-
- r = exec_context_load_environment(context, &files_env);
- if (r < 0) {
- log_struct_unit(LOG_ERR,
- unit_id,
- "MESSAGE=Failed to load environment files: %s", strerror(-r),
- "ERRNO=%d", -r,
- NULL);
- return r;
+ err = reset_signal_mask();
+ if (err < 0) {
+ *error = EXIT_SIGNAL_MASK;
+ return err;
}
- if (!argv)
- argv = command->argv;
+ if (params->idle_pipe)
+ do_idle_pipe_dance(params->idle_pipe);
- line = exec_command_line(argv);
- if (!line)
- return log_oom();
+ /* Close sockets very early to make sure we don't
+ * block init reexecution because it cannot bind its
+ * sockets */
+ log_forget_fds();
- log_struct_unit(LOG_DEBUG,
- unit_id,
- "EXECUTABLE=%s", command->path,
- "MESSAGE=About to execute: %s", line,
- NULL);
- free(line);
+ if (socket_fd >= 0)
+ dont_close[n_dont_close++] = socket_fd;
+ if (n_fds > 0) {
+ memcpy(dont_close + n_dont_close, fds, sizeof(int) * n_fds);
+ n_dont_close += n_fds;
+ }
+ if (params->bus_endpoint_fd >= 0)
+ dont_close[n_dont_close++] = params->bus_endpoint_fd;
+ if (runtime) {
+ if (runtime->netns_storage_socket[0] >= 0)
+ dont_close[n_dont_close++] = runtime->netns_storage_socket[0];
+ if (runtime->netns_storage_socket[1] >= 0)
+ dont_close[n_dont_close++] = runtime->netns_storage_socket[1];
+ }
- pid = fork();
- if (pid < 0)
- return -errno;
+ err = close_all_fds(dont_close, n_dont_close);
+ if (err < 0) {
+ *error = EXIT_FDS;
+ return err;
+ }
- if (pid == 0) {
- _cleanup_strv_free_ char **our_env = NULL, **pam_env = NULL, **final_env = NULL, **final_argv = NULL;
- const char *username = NULL, *home = NULL, *shell = NULL;
- unsigned n_dont_close = 0;
- int dont_close[n_fds + 3];
- uid_t uid = (uid_t) -1;
- gid_t gid = (gid_t) -1;
- sigset_t ss;
- int i, err;
-
- /* 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 (!context->same_pgrp)
+ if (setsid() < 0) {
+ *error = EXIT_SETSID;
+ return -errno;
}
- if (idle_pipe)
- do_idle_pipe_dance(idle_pipe);
+ exec_context_tty_reset(context);
+
+ if (params->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");
+ *error = EXIT_CONFIRM;
+ return -ECANCELED;
+ } else if (response == 'n') {
+ write_confirm_message("Failing execution.\n");
+ *error = 0;
+ return 0;
+ }
+ }
- /* Close sockets very early to make sure we don't
- * block init reexecution because it cannot bind its
- * sockets */
- log_forget_fds();
+ /* 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);
- if (socket_fd >= 0)
- dont_close[n_dont_close++] = socket_fd;
- if (n_fds > 0) {
- memcpy(dont_close + n_dont_close, fds, sizeof(int) * n_fds);
- n_dont_close += n_fds;
- }
- if (runtime) {
- if (runtime->netns_storage_socket[0] >= 0)
- dont_close[n_dont_close++] = runtime->netns_storage_socket[0];
- if (runtime->netns_storage_socket[1] >= 0)
- dont_close[n_dont_close++] = runtime->netns_storage_socket[1];
- }
+ err = setup_input(context, socket_fd, params->apply_tty_stdin);
+ if (err < 0) {
+ *error = EXIT_STDIN;
+ return err;
+ }
+
+ err = setup_output(context, STDOUT_FILENO, socket_fd, basename(command->path), params->unit_id, params->apply_tty_stdin);
+ if (err < 0) {
+ *error = EXIT_STDOUT;
+ return err;
+ }
- err = close_all_fds(dont_close, n_dont_close);
+ err = setup_output(context, STDERR_FILENO, socket_fd, basename(command->path), params->unit_id, params->apply_tty_stdin);
+ if (err < 0) {
+ *error = EXIT_STDERR;
+ return err;
+ }
+
+ if (params->cgroup_path) {
+ err = cg_attach_everywhere(params->cgroup_supported, params->cgroup_path, 0);
if (err < 0) {
- r = EXIT_FDS;
- goto fail_child;
+ *error = EXIT_CGROUP;
+ return err;
}
+ }
- if (!context->same_pgrp)
- if (setsid() < 0) {
- err = -errno;
- r = EXIT_SETSID;
- goto fail_child;
- }
+ if (context->oom_score_adjust_set) {
+ char t[16];
- exec_context_tty_reset(context);
+ snprintf(t, sizeof(t), "%i", context->oom_score_adjust);
+ char_array_0(t);
- 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 (write_string_file("/proc/self/oom_score_adj", t) < 0) {
+ *error = EXIT_OOM_ADJUST;
+ return -errno;
+ }
+ }
+
+ if (context->nice_set)
+ if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) {
+ *error = EXIT_NICE;
+ return -errno;
}
- /* 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);
+ if (context->cpu_sched_set) {
+ struct sched_param param = {
+ .sched_priority = context->cpu_sched_priority,
+ };
- err = setup_input(context, socket_fd, apply_tty_stdin);
+ err = sched_setscheduler(0,
+ context->cpu_sched_policy |
+ (context->cpu_sched_reset_on_fork ?
+ SCHED_RESET_ON_FORK : 0),
+ ¶m);
if (err < 0) {
- r = EXIT_STDIN;
- goto fail_child;
+ *error = EXIT_SETSCHEDULER;
+ return -errno;
}
+ }
- err = setup_output(context, STDOUT_FILENO, socket_fd, basename(command->path), unit_id, apply_tty_stdin);
- if (err < 0) {
- r = EXIT_STDOUT;
- goto fail_child;
+ if (context->cpuset)
+ if (sched_setaffinity(0, CPU_ALLOC_SIZE(context->cpuset_ncpus), context->cpuset) < 0) {
+ *error = EXIT_CPUAFFINITY;
+ return -errno;
}
- err = setup_output(context, STDERR_FILENO, socket_fd, basename(command->path), unit_id, apply_tty_stdin);
- if (err < 0) {
- r = EXIT_STDERR;
- goto fail_child;
+ if (context->ioprio_set)
+ if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) {
+ *error = EXIT_IOPRIO;
+ return -errno;
}
- if (cgroup_path) {
- err = cg_attach_everywhere(cgroup_supported, cgroup_path, 0);
- if (err < 0) {
- r = EXIT_CGROUP;
- goto fail_child;
- }
+ if (context->timer_slack_nsec != NSEC_INFINITY)
+ if (prctl(PR_SET_TIMERSLACK, context->timer_slack_nsec) < 0) {
+ *error = EXIT_TIMERSLACK;
+ return -errno;
}
- if (context->oom_score_adjust_set) {
- char t[16];
+ if (context->personality != 0xffffffffUL)
+ if (personality(context->personality) < 0) {
+ *error = EXIT_PERSONALITY;
+ return -errno;
+ }
- snprintf(t, sizeof(t), "%i", context->oom_score_adjust);
- char_array_0(t);
+ if (context->utmp_id)
+ utmp_put_init_process(context->utmp_id, getpid(), getsid(0), context->tty_path);
- if (write_string_file("/proc/self/oom_score_adj", t) < 0) {
- err = -errno;
- r = EXIT_OOM_ADJUST;
- goto fail_child;
- }
+ if (context->user) {
+ username = context->user;
+ err = get_user_creds(&username, &uid, &gid, &home, &shell);
+ if (err < 0) {
+ *error = EXIT_USER;
+ return err;
}
- if (context->nice_set)
- if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) {
- err = -errno;
- r = EXIT_NICE;
- goto fail_child;
+ if (is_terminal_input(context->std_input)) {
+ err = chown_terminal(STDIN_FILENO, uid);
+ if (err < 0) {
+ *error = EXIT_STDIN;
+ return err;
}
+ }
+ }
- if (context->cpu_sched_set) {
- struct sched_param param = {
- .sched_priority = context->cpu_sched_priority,
- };
+#ifdef ENABLE_KDBUS
+ if (params->bus_endpoint_fd >= 0 && context->bus_endpoint) {
+ uid_t ep_uid = (uid == (uid_t) -1) ? 0 : uid;
- r = sched_setscheduler(0,
- context->cpu_sched_policy |
- (context->cpu_sched_reset_on_fork ?
- SCHED_RESET_ON_FORK : 0),
- ¶m);
- if (r < 0) {
- err = -errno;
- r = EXIT_SETSCHEDULER;
- goto fail_child;
- }
+ err = bus_kernel_set_endpoint_policy(params->bus_endpoint_fd, ep_uid, context->bus_endpoint);
+ if (err < 0) {
+ *error = EXIT_BUS_ENDPOINT;
+ return err;
}
+ }
+#endif
- if (context->cpuset)
- if (sched_setaffinity(0, CPU_ALLOC_SIZE(context->cpuset_ncpus), context->cpuset) < 0) {
- err = -errno;
- r = EXIT_CPUAFFINITY;
- goto fail_child;
- }
+#ifdef HAVE_PAM
+ if (params->cgroup_path && context->user && context->pam_name) {
+ err = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, 0644, uid, gid);
+ if (err < 0) {
+ *error = EXIT_CGROUP;
+ return err;
+ }
- 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_INFINITY)
- if (prctl(PR_SET_TIMERSLACK, context->timer_slack_nsec) < 0) {
- err = -errno;
- r = EXIT_TIMERSLACK;
- goto fail_child;
- }
+ err = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, 0755, uid, gid);
+ if (err < 0) {
+ *error = EXIT_CGROUP;
+ return err;
+ }
+ }
+#endif
- if (context->personality != 0xffffffffUL)
- if (personality(context->personality) < 0) {
- err = -errno;
- r = EXIT_PERSONALITY;
- goto fail_child;
- }
+ if (!strv_isempty(context->runtime_directory) && params->runtime_prefix) {
+ char **rt;
- if (context->utmp_id)
- utmp_put_init_process(context->utmp_id, getpid(), getsid(0), context->tty_path);
+ STRV_FOREACH(rt, context->runtime_directory) {
+ _cleanup_free_ char *p;
- if (context->user) {
- username = context->user;
- err = get_user_creds(&username, &uid, &gid, &home, &shell);
- if (err < 0) {
- r = EXIT_USER;
- goto fail_child;
+ p = strjoin(params->runtime_prefix, "/", *rt, NULL);
+ if (!p) {
+ *error = EXIT_RUNTIME_DIRECTORY;
+ return -ENOMEM;
}
- if (is_terminal_input(context->std_input)) {
- err = chown_terminal(STDIN_FILENO, uid);
- if (err < 0) {
- r = EXIT_STDIN;
- goto fail_child;
- }
+ err = mkdir_safe(p, context->runtime_directory_mode, uid, gid);
+ if (err < 0) {
+ *error = EXIT_RUNTIME_DIRECTORY;
+ return err;
}
}
+ }
-#ifdef HAVE_PAM
- if (cgroup_path && context->user && context->pam_name) {
- err = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER, cgroup_path, 0644, uid, gid);
- if (err < 0) {
- r = EXIT_CGROUP;
- goto fail_child;
- }
+ if (params->apply_permissions) {
+ err = enforce_groups(context, username, gid);
+ if (err < 0) {
+ *error = EXIT_GROUP;
+ return err;
+ }
+ }
+ umask(context->umask);
- err = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER, cgroup_path, 0755, uid, gid);
- if (err < 0) {
- r = EXIT_CGROUP;
- goto fail_child;
- }
+#ifdef HAVE_PAM
+ if (params->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) {
+ *error = EXIT_PAM;
+ return err;
}
+ }
#endif
- if (!strv_isempty(context->runtime_directory) && runtime_prefix) {
- char **rt;
+ if (context->private_network && runtime && runtime->netns_storage_socket[0] >= 0) {
+ err = setup_netns(runtime->netns_storage_socket);
+ if (err < 0) {
+ *error = EXIT_NETWORK;
+ return err;
+ }
+ }
- STRV_FOREACH(rt, context->runtime_directory) {
- _cleanup_free_ char *p;
+ if (!strv_isempty(context->read_write_dirs) ||
+ !strv_isempty(context->read_only_dirs) ||
+ !strv_isempty(context->inaccessible_dirs) ||
+ context->mount_flags != 0 ||
+ (context->private_tmp && runtime && (runtime->tmp_dir || runtime->var_tmp_dir)) ||
+ params->bus_endpoint_path ||
+ context->private_devices ||
+ context->protect_system != PROTECT_SYSTEM_NO ||
+ context->protect_home != PROTECT_HOME_NO) {
+
+ char *tmp = NULL, *var = NULL;
+
+ /* The runtime struct only contains the parent
+ * of the private /tmp, which is
+ * non-accessible to world users. Inside of it
+ * there's a /tmp that is sticky, and that's
+ * the one we want to use here. */
+
+ if (context->private_tmp && runtime) {
+ if (runtime->tmp_dir)
+ tmp = strappenda(runtime->tmp_dir, "/tmp");
+ if (runtime->var_tmp_dir)
+ var = strappenda(runtime->var_tmp_dir, "/tmp");
+ }
- p = strjoin(runtime_prefix, "/", *rt, NULL);
- if (!p) {
- r = EXIT_RUNTIME_DIRECTORY;
- err = -ENOMEM;
- goto fail_child;
- }
+ err = setup_namespace(
+ context->read_write_dirs,
+ context->read_only_dirs,
+ context->inaccessible_dirs,
+ tmp,
+ var,
+ params->bus_endpoint_path,
+ context->private_devices,
+ context->protect_home,
+ context->protect_system,
+ context->mount_flags);
+
+ if (err == -EPERM)
+ log_warning_unit(params->unit_id, "Failed to set up file system namespace due to lack of privileges. Execution sandbox will not be in effect: %s", strerror(-err));
+ else if (err < 0) {
+ *error = EXIT_NAMESPACE;
+ return err;
+ }
+ }
- err = mkdir_safe(p, context->runtime_directory_mode, uid, gid);
- if (err < 0) {
- r = EXIT_RUNTIME_DIRECTORY;
- goto fail_child;
- }
+ if (params->apply_chroot) {
+ if (context->root_directory)
+ if (chroot(context->root_directory) < 0) {
+ *error = EXIT_CHROOT;
+ return -errno;
}
+
+ if (chdir(context->working_directory ? context->working_directory : "/") < 0) {
+ *error = EXIT_CHDIR;
+ return -errno;
}
+ } else {
+ _cleanup_free_ char *d = NULL;
- if (apply_permissions) {
- err = enforce_groups(context, username, gid);
- if (err < 0) {
- r = EXIT_GROUP;
- goto fail_child;
- }
+ if (asprintf(&d, "%s/%s",
+ context->root_directory ? context->root_directory : "",
+ context->working_directory ? context->working_directory : "") < 0) {
+ *error = EXIT_MEMORY;
+ return -ENOMEM;
}
- umask(context->umask);
+ if (chdir(d) < 0) {
+ *error = EXIT_CHDIR;
+ return -errno;
+ }
+ }
-#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;
+ /* We repeat the fd closing here, to make sure that
+ * nothing is leaked from the PAM modules. Note that
+ * we are more aggressive this time since socket_fd
+ * and the netns fds we don't need anymore. The custom
+ * endpoint fd was needed to upload the policy and can
+ * now be closed as well. */
+ 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) {
+ *error = EXIT_FDS;
+ return err;
+ }
+
+ if (params->apply_permissions) {
+
+ for (i = 0; i < _RLIMIT_MAX; i++) {
+ if (!context->rlimit[i])
+ continue;
+
+ if (setrlimit_closest(i, context->rlimit[i]) < 0) {
+ *error = EXIT_LIMITS;
+ return -errno;
}
}
-#endif
- if (context->private_network && runtime && runtime->netns_storage_socket[0] >= 0) {
- err = setup_netns(runtime->netns_storage_socket);
+
+ if (context->capability_bounding_set_drop) {
+ err = capability_bounding_set_drop(context->capability_bounding_set_drop, false);
if (err < 0) {
- r = EXIT_NETWORK;
- goto fail_child;
+ *error = EXIT_CAPABILITIES;
+ return err;
}
}
- if (!strv_isempty(context->read_write_dirs) ||
- !strv_isempty(context->read_only_dirs) ||
- !strv_isempty(context->inaccessible_dirs) ||
- context->mount_flags != 0 ||
- (context->private_tmp && runtime && (runtime->tmp_dir || runtime->var_tmp_dir)) ||
- context->private_devices ||
- context->protect_system != PROTECT_SYSTEM_NO ||
- context->protect_home != PROTECT_HOME_NO) {
-
- char *tmp = NULL, *var = NULL;
-
- /* The runtime struct only contains the parent
- * of the private /tmp, which is
- * non-accessible to world users. Inside of it
- * there's a /tmp that is sticky, and that's
- * the one we want to use here. */
-
- if (context->private_tmp && runtime) {
- if (runtime->tmp_dir)
- tmp = strappenda(runtime->tmp_dir, "/tmp");
- if (runtime->var_tmp_dir)
- var = strappenda(runtime->var_tmp_dir, "/tmp");
- }
-
- err = setup_namespace(
- context->read_write_dirs,
- context->read_only_dirs,
- context->inaccessible_dirs,
- tmp,
- var,
- context->private_devices,
- context->protect_home,
- context->protect_system,
- context->mount_flags);
+ if (context->user) {
+ err = enforce_user(context, uid);
if (err < 0) {
- r = EXIT_NAMESPACE;
- goto fail_child;
+ *error = EXIT_USER;
+ return err;
}
}
- if (apply_chroot) {
- if (context->root_directory)
- if (chroot(context->root_directory) < 0) {
- err = -errno;
- r = EXIT_CHROOT;
- 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) {
+ *error = EXIT_SECUREBITS;
+ return -errno;
+ }
- if (chdir(context->working_directory ? context->working_directory : "/") < 0) {
- err = -errno;
- r = EXIT_CHDIR;
- goto fail_child;
+ if (context->capabilities)
+ if (cap_set_proc(context->capabilities) < 0) {
+ *error = EXIT_CAPABILITIES;
+ return -errno;
}
- } else {
- _cleanup_free_ char *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 (context->no_new_privileges)
+ if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) {
+ *error = EXIT_NO_NEW_PRIVILEGES;
+ return -errno;
}
- if (chdir(d) < 0) {
- err = -errno;
- r = EXIT_CHDIR;
- goto fail_child;
+#ifdef HAVE_SECCOMP
+ if (context->address_families_whitelist ||
+ !set_isempty(context->address_families)) {
+ err = apply_address_families(context);
+ if (err < 0) {
+ *error = EXIT_ADDRESS_FAMILIES;
+ return err;
}
}
- /* 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 (context->syscall_whitelist ||
+ !set_isempty(context->syscall_filter) ||
+ !set_isempty(context->syscall_archs)) {
+ err = apply_seccomp(context);
+ if (err < 0) {
+ *error = EXIT_SECCOMP;
+ return err;
+ }
}
+#endif
- if (apply_permissions) {
-
- for (i = 0; i < _RLIMIT_MAX; i++) {
- if (!context->rlimit[i])
- continue;
-
- if (setrlimit_closest(i, context->rlimit[i]) < 0) {
- err = -errno;
- r = EXIT_LIMITS;
- goto fail_child;
+#ifdef HAVE_SELINUX
+ if (use_selinux()) {
+ if (context->selinux_context) {
+ err = setexeccon(context->selinux_context);
+ if (err < 0 && !context->selinux_context_ignore) {
+ *error = EXIT_SELINUX_CONTEXT;
+ return err;
}
}
- if (context->capability_bounding_set_drop) {
- err = capability_bounding_set_drop(context->capability_bounding_set_drop, false);
+ if (params->selinux_context_net && socket_fd >= 0) {
+ _cleanup_free_ char *label = NULL;
+
+ err = label_get_child_mls_label(socket_fd, command->path, &label);
if (err < 0) {
- r = EXIT_CAPABILITIES;
- goto fail_child;
+ *error = EXIT_SELINUX_CONTEXT;
+ return err;
}
- }
- if (context->user) {
- err = enforce_user(context, uid);
+ err = setexeccon(label);
if (err < 0) {
- r = EXIT_USER;
- goto fail_child;
+ *error = EXIT_SELINUX_CONTEXT;
+ return err;
}
}
+ }
+#endif
- /* 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;
- }
+#ifdef HAVE_APPARMOR
+ if (context->apparmor_profile && use_apparmor()) {
+ err = aa_change_onexec(context->apparmor_profile);
+ if (err < 0 && !context->apparmor_profile_ignore) {
+ *error = EXIT_APPARMOR_PROFILE;
+ return -errno;
+ }
+ }
+#endif
+ }
- if (context->capabilities)
- if (cap_set_proc(context->capabilities) < 0) {
- err = -errno;
- r = EXIT_CAPABILITIES;
- goto fail_child;
- }
+ err = build_environment(context, n_fds, params->watchdog_usec, home, username, shell, &our_env);
+ if (err < 0) {
+ *error = EXIT_MEMORY;
+ return err;
+ }
- 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;
- }
+ final_env = strv_env_merge(5,
+ params->environment,
+ our_env,
+ context->environment,
+ files_env,
+ pam_env,
+ NULL);
+ if (!final_env) {
+ *error = EXIT_MEMORY;
+ return -ENOMEM;
+ }
-#ifdef HAVE_SECCOMP
- if (context->address_families_whitelist ||
- !set_isempty(context->address_families)) {
- err = apply_address_families(context);
- if (err < 0) {
- r = EXIT_ADDRESS_FAMILIES;
- goto fail_child;
- }
- }
+ final_argv = replace_env_argv(argv, final_env);
+ if (!final_argv) {
+ *error = EXIT_MEMORY;
+ return -ENOMEM;
+ }
- if (context->syscall_whitelist ||
- !set_isempty(context->syscall_filter) ||
- !set_isempty(context->syscall_archs)) {
- err = apply_seccomp(context);
- if (err < 0) {
- r = EXIT_SECCOMP;
- goto fail_child;
- }
- }
-#endif
+ final_env = strv_env_clean(final_env);
-#ifdef HAVE_SELINUX
- if (context->selinux_context && use_selinux()) {
- err = setexeccon(context->selinux_context);
- if (err < 0 && !context->selinux_context_ignore) {
- r = EXIT_SELINUX_CONTEXT;
- goto fail_child;
- }
- }
-#endif
+ if (_unlikely_(log_get_max_level() >= LOG_PRI(LOG_DEBUG))) {
+ _cleanup_free_ char *line;
-#ifdef HAVE_APPARMOR
- if (context->apparmor_profile && use_apparmor()) {
- err = aa_change_onexec(context->apparmor_profile);
- if (err < 0 && !context->apparmor_profile_ignore) {
- r = EXIT_APPARMOR_PROFILE;
- goto fail_child;
- }
- }
-#endif
+ line = exec_command_line(final_argv);
+ if (line) {
+ log_open();
+ log_struct_unit(LOG_DEBUG,
+ params->unit_id,
+ "EXECUTABLE=%s", command->path,
+ "MESSAGE=Executing: %s", line,
+ NULL);
+ log_close();
}
+ }
+ execve(command->path, final_argv, final_env);
+ *error = EXIT_EXEC;
+ return -errno;
+}
- err = build_environment(context, n_fds, watchdog_usec, home, username, shell, &our_env);
- if (r < 0) {
- r = EXIT_MEMORY;
- goto fail_child;
- }
+int exec_spawn(ExecCommand *command,
+ const ExecContext *context,
+ const ExecParameters *params,
+ ExecRuntime *runtime,
+ pid_t *ret) {
- final_env = strv_env_merge(5,
- environment,
- our_env,
- context->environment,
- files_env,
- pam_env,
- NULL);
- if (!final_env) {
- err = -ENOMEM;
- r = EXIT_MEMORY;
- goto fail_child;
- }
+ _cleanup_strv_free_ char **files_env = NULL;
+ int *fds = NULL; unsigned n_fds = 0;
+ char *line, **argv;
+ int socket_fd;
+ pid_t pid;
+ int err;
- final_argv = replace_env_argv(argv, final_env);
- if (!final_argv) {
- err = -ENOMEM;
- r = EXIT_MEMORY;
- goto fail_child;
- }
+ assert(command);
+ assert(context);
+ assert(ret);
+ assert(params);
+ assert(params->fds || params->n_fds <= 0);
- final_env = strv_env_clean(final_env);
-
- if (_unlikely_(log_get_max_level() >= LOG_PRI(LOG_DEBUG))) {
- line = exec_command_line(final_argv);
- if (line) {
- log_open();
- log_struct_unit(LOG_DEBUG,
- unit_id,
- "EXECUTABLE=%s", command->path,
- "MESSAGE=Executing: %s", line,
- NULL);
- log_close();
- free(line);
- line = NULL;
- }
- }
- execve(command->path, final_argv, final_env);
- err = -errno;
- r = EXIT_EXEC;
+ if (context->std_input == EXEC_INPUT_SOCKET ||
+ context->std_output == EXEC_OUTPUT_SOCKET ||
+ context->std_error == EXEC_OUTPUT_SOCKET) {
- fail_child:
+ if (params->n_fds != 1)
+ return -EINVAL;
+
+ socket_fd = params->fds[0];
+ } else {
+ socket_fd = -1;
+ fds = params->fds;
+ n_fds = params->n_fds;
+ }
+
+ err = exec_context_load_environment(context, &files_env);
+ if (err < 0) {
+ log_struct_unit(LOG_ERR,
+ params->unit_id,
+ "MESSAGE=Failed to load environment files: %s", strerror(-err),
+ "ERRNO=%d", -err,
+ NULL);
+ return err;
+ }
+
+ argv = params->argv ?: command->argv;
+
+ line = exec_command_line(argv);
+ if (!line)
+ return log_oom();
+
+ log_struct_unit(LOG_DEBUG,
+ params->unit_id,
+ "EXECUTABLE=%s", command->path,
+ "MESSAGE=About to execute: %s", line,
+ NULL);
+ free(line);
+
+ pid = fork();
+ if (pid < 0)
+ return -errno;
+
+ if (pid == 0) {
+ int r;
+
+ err = exec_child(command,
+ context,
+ params,
+ runtime,
+ argv,
+ socket_fd,
+ fds, n_fds,
+ files_env,
+ &r);
if (r != 0) {
log_open();
log_struct(LOG_ERR, MESSAGE_ID(SD_MESSAGE_SPAWN_FAILED),
}
log_struct_unit(LOG_DEBUG,
- unit_id,
+ params->unit_id,
"MESSAGE=Forked %s as "PID_FMT,
command->path, pid,
NULL);
* 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_path)
- cg_attach(SYSTEMD_CGROUP_CONTROLLER, cgroup_path, pid);
+ if (params->cgroup_path)
+ cg_attach(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, pid);
exec_status_start(&command->exec_status, pid);
strv_free(c->runtime_directory);
c->runtime_directory = NULL;
+
+ bus_endpoint_free(c->bus_endpoint);
+ c->bus_endpoint = NULL;
}
int exec_context_destroy_runtime_directory(ExecContext *c, const char *runtime_prefix) {
assert(s);
assert(f);
- if (!prefix)
- prefix = "";
-
if (s->pid <= 0)
return;
+ prefix = strempty(prefix);
+
fprintf(f,
"%sPID: "PID_FMT"\n",
prefix, s->pid);
}
void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) {
- _cleanup_free_ char *p2 = NULL;
- const char *prefix2;
-
_cleanup_free_ char *cmd = NULL;
+ const char *prefix2;
assert(c);
assert(f);
- if (!prefix)
- prefix = "";
- p2 = strappend(prefix, "\t");
- prefix2 = p2 ? p2 : prefix;
+ prefix = strempty(prefix);
+ prefix2 = strappenda(prefix, "\t");
cmd = exec_command_line(c->argv);
-
fprintf(f,
"%sCommand Line: %s\n",
prefix, cmd ? cmd : strerror(ENOMEM));
void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) {
assert(f);
- if (!prefix)
- prefix = "";
+ prefix = strempty(prefix);
LIST_FOREACH(command, c, c)
exec_command_dump(c, f, prefix);
return 0;
}
+int exec_command_append(ExecCommand *c, const char *path, ...) {
+ _cleanup_strv_free_ char **l = NULL;
+ va_list ap;
+ int r;
+
+ assert(c);
+ assert(path);
+
+ va_start(ap, path);
+ l = strv_new_ap(path, ap);
+ va_end(ap);
+
+ if (!l)
+ return -ENOMEM;
+
+ r = strv_extend_strv(&c->argv, l);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+
static int exec_runtime_allocate(ExecRuntime **rt) {
if (*rt)
~ianmdlvl / elogind.git / blobdiff