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/* SPDX-License-Identifier: LGPL-2.1+ */
#pragma once
/***
Copyright 2010 Lennart Poettering
***/
typedef struct ExecStatus ExecStatus;
typedef struct ExecCommand ExecCommand;
typedef struct ExecContext ExecContext;
typedef struct ExecRuntime ExecRuntime;
typedef struct ExecParameters ExecParameters;
typedef struct Manager Manager;
#include <sched.h>
#include <stdbool.h>
#include <stdio.h>
#include <sys/capability.h>
#include "cgroup-util.h"
#include "fdset.h"
#include "list.h"
#include "missing.h"
#include "namespace.h"
#include "nsflags.h"
#define EXEC_STDIN_DATA_MAX (64U*1024U*1024U)
typedef enum ExecUtmpMode {
EXEC_UTMP_INIT,
EXEC_UTMP_LOGIN,
EXEC_UTMP_USER,
_EXEC_UTMP_MODE_MAX,
_EXEC_UTMP_MODE_INVALID = -1
} ExecUtmpMode;
typedef enum ExecInput {
EXEC_INPUT_NULL,
EXEC_INPUT_TTY,
EXEC_INPUT_TTY_FORCE,
EXEC_INPUT_TTY_FAIL,
EXEC_INPUT_SOCKET,
EXEC_INPUT_NAMED_FD,
EXEC_INPUT_DATA,
EXEC_INPUT_FILE,
_EXEC_INPUT_MAX,
_EXEC_INPUT_INVALID = -1
} ExecInput;
typedef enum ExecOutput {
EXEC_OUTPUT_INHERIT,
EXEC_OUTPUT_NULL,
EXEC_OUTPUT_TTY,
EXEC_OUTPUT_SYSLOG,
EXEC_OUTPUT_SYSLOG_AND_CONSOLE,
EXEC_OUTPUT_KMSG,
EXEC_OUTPUT_KMSG_AND_CONSOLE,
EXEC_OUTPUT_JOURNAL,
EXEC_OUTPUT_JOURNAL_AND_CONSOLE,
EXEC_OUTPUT_SOCKET,
EXEC_OUTPUT_NAMED_FD,
EXEC_OUTPUT_FILE,
_EXEC_OUTPUT_MAX,
_EXEC_OUTPUT_INVALID = -1
} ExecOutput;
typedef enum ExecPreserveMode {
EXEC_PRESERVE_NO,
EXEC_PRESERVE_YES,
EXEC_PRESERVE_RESTART,
_EXEC_PRESERVE_MODE_MAX,
_EXEC_PRESERVE_MODE_INVALID = -1
} ExecPreserveMode;
typedef enum ExecKeyringMode {
EXEC_KEYRING_INHERIT,
EXEC_KEYRING_PRIVATE,
EXEC_KEYRING_SHARED,
_EXEC_KEYRING_MODE_MAX,
_EXEC_KEYRING_MODE_INVALID = -1,
} ExecKeyringMode;
struct ExecStatus {
dual_timestamp start_timestamp;
dual_timestamp exit_timestamp;
pid_t pid;
int code; /* as in siginfo_t::si_code */
int status; /* as in sigingo_t::si_status */
};
typedef enum ExecCommandFlags {
EXEC_COMMAND_IGNORE_FAILURE = 1,
EXEC_COMMAND_FULLY_PRIVILEGED = 2,
EXEC_COMMAND_NO_SETUID = 4,
EXEC_COMMAND_AMBIENT_MAGIC = 8,
} ExecCommandFlags;
struct ExecCommand {
char *path;
char **argv;
ExecStatus exec_status;
ExecCommandFlags flags;
LIST_FIELDS(ExecCommand, command); /* useful for chaining commands */
};
struct ExecRuntime {
int n_ref;
Manager *manager;
/* unit id of the owner */
char *id;
char *tmp_dir;
char *var_tmp_dir;
/* An AF_UNIX socket pair, that contains a datagram containing a file descriptor referring to the network
* namespace. */
int netns_storage_socket[2];
};
typedef enum ExecDirectoryType {
EXEC_DIRECTORY_RUNTIME = 0,
EXEC_DIRECTORY_STATE,
EXEC_DIRECTORY_CACHE,
EXEC_DIRECTORY_LOGS,
EXEC_DIRECTORY_CONFIGURATION,
_EXEC_DIRECTORY_TYPE_MAX,
_EXEC_DIRECTORY_TYPE_INVALID = -1,
} ExecDirectoryType;
typedef struct ExecDirectory {
char **paths;
mode_t mode;
} ExecDirectory;
struct ExecContext {
char **environment;
char **environment_files;
char **pass_environment;
char **unset_environment;
struct rlimit *rlimit[_RLIMIT_MAX];
char *working_directory, *root_directory, *root_image;
bool working_directory_missing_ok;
bool working_directory_home;
mode_t umask;
int oom_score_adjust;
int nice;
int ioprio;
int cpu_sched_policy;
int cpu_sched_priority;
cpu_set_t *cpuset;
unsigned cpuset_ncpus;
ExecInput std_input;
ExecOutput std_output;
ExecOutput std_error;
char *stdio_fdname[3];
char *stdio_file[3];
void *stdin_data;
size_t stdin_data_size;
nsec_t timer_slack_nsec;
bool stdio_as_fds;
char *tty_path;
bool tty_reset;
bool tty_vhangup;
bool tty_vt_disallocate;
bool ignore_sigpipe;
/* Since resolving these names might involve socket
* connections and we don't want to deadlock ourselves these
* names are resolved on execution only and in the child
* process. */
char *user;
char *group;
char **supplementary_groups;
char *pam_name;
char *utmp_id;
ExecUtmpMode utmp_mode;
bool selinux_context_ignore;
char *selinux_context;
bool apparmor_profile_ignore;
char *apparmor_profile;
bool smack_process_label_ignore;
char *smack_process_label;
ExecKeyringMode keyring_mode;
char **read_write_paths, **read_only_paths, **inaccessible_paths;
unsigned long mount_flags;
BindMount *bind_mounts;
size_t n_bind_mounts;
TemporaryFileSystem *temporary_filesystems;
size_t n_temporary_filesystems;
uint64_t capability_bounding_set;
uint64_t capability_ambient_set;
int secure_bits;
int syslog_priority;
char *syslog_identifier;
bool syslog_level_prefix;
int log_level_max;
struct iovec* log_extra_fields;
size_t n_log_extra_fields;
bool cpu_sched_reset_on_fork;
bool non_blocking;
bool private_tmp;
bool private_network;
bool private_devices;
bool private_users;
bool private_mounts;
ProtectSystem protect_system;
ProtectHome protect_home;
bool protect_kernel_tunables;
bool protect_kernel_modules;
bool protect_control_groups;
bool mount_apivfs;
bool no_new_privileges;
bool dynamic_user;
bool remove_ipc;
/* This is not exposed to the user but available
* internally. We need it to make sure that whenever we spawn
* /usr/bin/mount it is run in the same process group as us so
* that the autofs logic detects that it belongs to us and we
* don't enter a trigger loop. */
bool same_pgrp;
unsigned long personality;
bool lock_personality;
unsigned long restrict_namespaces; /* The CLONE_NEWxyz flags permitted to the unit's processes */
Hashmap *syscall_filter;
Set *syscall_archs;
int syscall_errno;
bool syscall_whitelist:1;
Set *address_families;
bool address_families_whitelist:1;
ExecPreserveMode runtime_directory_preserve_mode;
ExecDirectory directories[_EXEC_DIRECTORY_TYPE_MAX];
bool memory_deny_write_execute;
bool restrict_realtime;
bool oom_score_adjust_set:1;
bool nice_set:1;
bool ioprio_set:1;
bool cpu_sched_set:1;
};
static inline bool exec_context_restrict_namespaces_set(const ExecContext *c) {
assert(c);
return (c->restrict_namespaces & NAMESPACE_FLAGS_ALL) != NAMESPACE_FLAGS_ALL;
}
typedef enum ExecFlags {
EXEC_APPLY_SANDBOXING = 1 << 0,
EXEC_APPLY_CHROOT = 1 << 1,
EXEC_APPLY_TTY_STDIN = 1 << 2,
EXEC_NEW_KEYRING = 1 << 3,
EXEC_PASS_LOG_UNIT = 1 << 4, /* Whether to pass the unit name to the service's journal stream connection */
EXEC_CHOWN_DIRECTORIES = 1 << 5, /* chown() the runtime/state/cache/log directories to the user we run as, under all conditions */
EXEC_NSS_BYPASS_BUS = 1 << 6, /* Set the SYSTEMD_NSS_BYPASS_BUS environment variable, to disable nss-systemd for dbus */
EXEC_CGROUP_DELEGATE = 1 << 7,
/* The following are not used by execute.c, but by consumers internally */
EXEC_PASS_FDS = 1 << 8,
EXEC_IS_CONTROL = 1 << 9,
EXEC_SETENV_RESULT = 1 << 10,
EXEC_SET_WATCHDOG = 1 << 11,
} ExecFlags;
struct ExecParameters {
char **argv;
char **environment;
int *fds;
char **fd_names;
size_t n_storage_fds;
size_t n_socket_fds;
ExecFlags flags;
bool selinux_context_net:1;
CGroupMask cgroup_supported;
const char *cgroup_path;
char **prefix;
const char *confirm_spawn;
usec_t watchdog_usec;
int *idle_pipe;
int stdin_fd;
int stdout_fd;
int stderr_fd;
};
#include "unit.h"
#include "dynamic-user.h"
int exec_spawn(Unit *unit,
ExecCommand *command,
const ExecContext *context,
const ExecParameters *exec_params,
ExecRuntime *runtime,
DynamicCreds *dynamic_creds,
pid_t *ret);
void exec_command_done_array(ExecCommand *c, size_t n);
ExecCommand* exec_command_free_list(ExecCommand *c);
void exec_command_free_array(ExecCommand **c, size_t n);
void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix);
void exec_command_append_list(ExecCommand **l, ExecCommand *e);
int exec_command_set(ExecCommand *c, const char *path, ...);
int exec_command_append(ExecCommand *c, const char *path, ...);
void exec_context_init(ExecContext *c);
void exec_context_done(ExecContext *c);
void exec_context_dump(const ExecContext *c, FILE* f, const char *prefix);
int exec_context_destroy_runtime_directory(const ExecContext *c, const char *runtime_root);
const char* exec_context_fdname(const ExecContext *c, int fd_index);
bool exec_context_may_touch_console(const ExecContext *c);
bool exec_context_maintains_privileges(const ExecContext *c);
int exec_context_get_effective_ioprio(const ExecContext *c);
void exec_context_free_log_extra_fields(ExecContext *c);
void exec_status_start(ExecStatus *s, pid_t pid);
void exec_status_exit(ExecStatus *s, const ExecContext *context, pid_t pid, int code, int status);
void exec_status_dump(const ExecStatus *s, FILE *f, const char *prefix);
int exec_runtime_acquire(Manager *m, const ExecContext *c, const char *name, bool create, ExecRuntime **ret);
ExecRuntime *exec_runtime_unref(ExecRuntime *r, bool destroy);
int exec_runtime_serialize(const Manager *m, FILE *f, FDSet *fds);
int exec_runtime_deserialize_compat(Unit *u, const char *key, const char *value, FDSet *fds);
void exec_runtime_deserialize_one(Manager *m, const char *value, FDSet *fds);
void exec_runtime_vacuum(Manager *m);
const char* exec_output_to_string(ExecOutput i) _const_;
ExecOutput exec_output_from_string(const char *s) _pure_;
const char* exec_input_to_string(ExecInput i) _const_;
ExecInput exec_input_from_string(const char *s) _pure_;
const char* exec_utmp_mode_to_string(ExecUtmpMode i) _const_;
ExecUtmpMode exec_utmp_mode_from_string(const char *s) _pure_;
const char* exec_preserve_mode_to_string(ExecPreserveMode i) _const_;
ExecPreserveMode exec_preserve_mode_from_string(const char *s) _pure_;
const char* exec_keyring_mode_to_string(ExecKeyringMode i) _const_;
ExecKeyringMode exec_keyring_mode_from_string(const char *s) _pure_;
const char* exec_directory_type_to_string(ExecDirectoryType i) _const_;
ExecDirectoryType exec_directory_type_from_string(const char *s) _pure_;
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