1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
4 typedef struct ExecStatus ExecStatus
;
5 typedef struct ExecCommand ExecCommand
;
6 typedef struct ExecContext ExecContext
;
7 typedef struct ExecRuntime ExecRuntime
;
8 typedef struct ExecParameters ExecParameters
;
9 typedef struct Manager Manager
;
14 #include <sys/capability.h>
16 #include "cgroup-util.h"
17 #include "coredump-util.h"
18 #include "cpu-set-util.h"
19 #include "exec-util.h"
22 #include "missing_resource.h"
23 #include "namespace.h"
25 #include "numa-util.h"
26 #include "path-util.h"
27 #include "time-util.h"
29 #define EXEC_STDIN_DATA_MAX (64U*1024U*1024U)
31 typedef enum ExecUtmpMode
{
36 _EXEC_UTMP_MODE_INVALID
= -EINVAL
,
39 typedef enum ExecInput
{
49 _EXEC_INPUT_INVALID
= -EINVAL
,
52 typedef enum ExecOutput
{
57 EXEC_OUTPUT_KMSG_AND_CONSOLE
,
59 EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
63 EXEC_OUTPUT_FILE_APPEND
,
64 EXEC_OUTPUT_FILE_TRUNCATE
,
66 _EXEC_OUTPUT_INVALID
= -EINVAL
,
69 typedef enum ExecPreserveMode
{
72 EXEC_PRESERVE_RESTART
,
73 _EXEC_PRESERVE_MODE_MAX
,
74 _EXEC_PRESERVE_MODE_INVALID
= -EINVAL
,
77 typedef enum ExecKeyringMode
{
81 _EXEC_KEYRING_MODE_MAX
,
82 _EXEC_KEYRING_MODE_INVALID
= -EINVAL
,
85 /* Contains start and exit information about an executed command. */
87 dual_timestamp start_timestamp
;
88 dual_timestamp exit_timestamp
;
90 int code
; /* as in siginfo_t::si_code */
91 int status
; /* as in siginfo_t::si_status */
94 /* Stores information about commands we execute. Covers both configuration settings as well as runtime data. */
98 ExecStatus exec_status
;
99 ExecCommandFlags flags
;
100 LIST_FIELDS(ExecCommand
, command
); /* useful for chaining commands */
103 /* Encapsulates certain aspects of the runtime environment that is to be shared between multiple otherwise separate
104 * invocations of commands. Specifically, this allows sharing of /tmp and /var/tmp data as well as network namespaces
105 * between invocations of commands. This is a reference counted object, with one reference taken by each currently
106 * active command invocation that wants to share this runtime. */
112 char *id
; /* Unit id of the owner */
117 /* An AF_UNIX socket pair, that contains a datagram containing a file descriptor referring to the network
119 int netns_storage_socket
[2];
121 /* Like netns_storage_socket, but the file descriptor is referring to the IPC namespace. */
122 int ipcns_storage_socket
[2];
125 typedef enum ExecDirectoryType
{
126 EXEC_DIRECTORY_RUNTIME
= 0,
127 EXEC_DIRECTORY_STATE
,
128 EXEC_DIRECTORY_CACHE
,
130 EXEC_DIRECTORY_CONFIGURATION
,
131 _EXEC_DIRECTORY_TYPE_MAX
,
132 _EXEC_DIRECTORY_TYPE_INVALID
= -EINVAL
,
135 typedef struct ExecDirectoryItem
{
141 typedef struct ExecDirectory
{
144 ExecDirectoryItem
*items
;
147 typedef enum ExecCleanMask
{
148 /* In case you wonder why the bitmask below doesn't use "directory" in its name: we want to keep this
149 * generic so that .timer timestamp files can nicely be covered by this too, and similar. */
150 EXEC_CLEAN_RUNTIME
= 1U << EXEC_DIRECTORY_RUNTIME
,
151 EXEC_CLEAN_STATE
= 1U << EXEC_DIRECTORY_STATE
,
152 EXEC_CLEAN_CACHE
= 1U << EXEC_DIRECTORY_CACHE
,
153 EXEC_CLEAN_LOGS
= 1U << EXEC_DIRECTORY_LOGS
,
154 EXEC_CLEAN_CONFIGURATION
= 1U << EXEC_DIRECTORY_CONFIGURATION
,
156 EXEC_CLEAN_ALL
= (1U << _EXEC_DIRECTORY_TYPE_MAX
) - 1,
157 _EXEC_CLEAN_MASK_INVALID
= -EINVAL
,
160 /* A credential configured with LoadCredential= */
161 typedef struct ExecLoadCredential
{
164 } ExecLoadCredential
;
166 /* A credential configured with SetCredential= */
167 typedef struct ExecSetCredential
{
174 /* Encodes configuration parameters applied to invoked commands. Does not carry runtime data, but only configuration
175 * changes sourced from unit files and suchlike. ExecContext objects are usually embedded into Unit objects, and do not
176 * change after being loaded. */
179 char **environment_files
;
180 char **pass_environment
;
181 char **unset_environment
;
183 struct rlimit
*rlimit
[_RLIMIT_MAX
];
184 char *working_directory
, *root_directory
, *root_image
, *root_verity
, *root_hash_path
, *root_hash_sig_path
;
185 void *root_hash
, *root_hash_sig
;
186 size_t root_hash_size
, root_hash_sig_size
;
187 LIST_HEAD(MountOptions
, root_image_options
);
188 bool working_directory_missing_ok
:1;
189 bool working_directory_home
:1;
191 bool oom_score_adjust_set
:1;
192 bool coredump_filter_set
:1;
195 bool cpu_sched_set
:1;
196 bool mount_apivfs_set
:1;
198 /* This is not exposed to the user but available internally. We need it to make sure that whenever we
199 * spawn /usr/bin/mount it is run in the same process group as us so that the autofs logic detects
200 * that it belongs to us and we don't enter a trigger loop. */
203 bool cpu_sched_reset_on_fork
;
207 int oom_score_adjust
;
210 int cpu_sched_policy
;
211 int cpu_sched_priority
;
212 uint64_t coredump_filter
;
215 NUMAPolicy numa_policy
;
216 bool cpu_affinity_from_numa
;
219 ExecOutput std_output
;
220 ExecOutput std_error
;
222 char *stdio_fdname
[3];
226 size_t stdin_data_size
;
228 nsec_t timer_slack_nsec
;
234 bool tty_vt_disallocate
;
241 ExecKeyringMode keyring_mode
;
243 /* Since resolving these names might involve socket
244 * connections and we don't want to deadlock ourselves these
245 * names are resolved on execution only and in the child
249 char **supplementary_groups
;
254 ExecUtmpMode utmp_mode
;
256 bool no_new_privileges
;
258 bool selinux_context_ignore
;
259 bool apparmor_profile_ignore
;
260 bool smack_process_label_ignore
;
262 char *selinux_context
;
263 char *apparmor_profile
;
264 char *smack_process_label
;
266 char **read_write_paths
, **read_only_paths
, **inaccessible_paths
, **exec_paths
, **no_exec_paths
;
267 char **exec_search_path
;
268 unsigned long mount_flags
;
269 BindMount
*bind_mounts
;
270 size_t n_bind_mounts
;
271 TemporaryFileSystem
*temporary_filesystems
;
272 size_t n_temporary_filesystems
;
273 MountImage
*mount_images
;
274 size_t n_mount_images
;
275 MountImage
*extension_images
;
276 size_t n_extension_images
;
277 char **extension_directories
;
279 uint64_t capability_bounding_set
;
280 uint64_t capability_ambient_set
;
284 bool syslog_level_prefix
;
285 char *syslog_identifier
;
287 struct iovec
* log_extra_fields
;
288 size_t n_log_extra_fields
;
290 usec_t log_ratelimit_interval_usec
;
291 unsigned log_ratelimit_burst
;
297 ProtectProc protect_proc
; /* hidepid= */
298 ProcSubset proc_subset
; /* subset= */
301 bool private_network
;
302 bool private_devices
;
306 bool protect_kernel_tunables
;
307 bool protect_kernel_modules
;
308 bool protect_kernel_logs
;
310 bool protect_control_groups
;
311 ProtectSystem protect_system
;
312 ProtectHome protect_home
;
313 bool protect_hostname
;
319 bool memory_deny_write_execute
;
320 bool restrict_realtime
;
321 bool restrict_suid_sgid
;
323 bool lock_personality
;
324 unsigned long personality
;
326 unsigned long restrict_namespaces
; /* The CLONE_NEWxyz flags permitted to the unit's processes */
328 Set
*restrict_filesystems
;
329 bool restrict_filesystems_allow_list
:1;
331 Hashmap
*syscall_filter
;
334 bool syscall_allow_list
:1;
336 Hashmap
*syscall_log
;
337 bool syscall_log_allow_list
:1; /* Log listed system calls */
339 bool address_families_allow_list
:1;
340 Set
*address_families
;
342 char *network_namespace_path
;
343 char *ipc_namespace_path
;
345 ExecDirectory directories
[_EXEC_DIRECTORY_TYPE_MAX
];
346 ExecPreserveMode runtime_directory_preserve_mode
;
347 usec_t timeout_clean_usec
;
349 Hashmap
*set_credentials
; /* output id → ExecSetCredential */
350 Hashmap
*load_credentials
; /* output id → ExecLoadCredential */
353 static inline bool exec_context_restrict_namespaces_set(const ExecContext
*c
) {
356 return (c
->restrict_namespaces
& NAMESPACE_FLAGS_ALL
) != NAMESPACE_FLAGS_ALL
;
359 static inline bool exec_context_restrict_filesystems_set(const ExecContext
*c
) {
362 return c
->restrict_filesystems_allow_list
||
363 !set_isempty(c
->restrict_filesystems
);
366 static inline bool exec_context_with_rootfs(const ExecContext
*c
) {
369 /* Checks if RootDirectory= or RootImage= are used */
371 return !empty_or_root(c
->root_directory
) || c
->root_image
;
374 typedef enum ExecFlags
{
375 EXEC_APPLY_SANDBOXING
= 1 << 0,
376 EXEC_APPLY_CHROOT
= 1 << 1,
377 EXEC_APPLY_TTY_STDIN
= 1 << 2,
378 EXEC_PASS_LOG_UNIT
= 1 << 3, /* Whether to pass the unit name to the service's journal stream connection */
379 EXEC_CHOWN_DIRECTORIES
= 1 << 4, /* chown() the runtime/state/cache/log directories to the user we run as, under all conditions */
380 EXEC_NSS_DYNAMIC_BYPASS
= 1 << 5, /* Set the SYSTEMD_NSS_DYNAMIC_BYPASS environment variable, to disable nss-systemd blocking on PID 1, for use by dbus-daemon */
381 EXEC_CGROUP_DELEGATE
= 1 << 6,
382 EXEC_IS_CONTROL
= 1 << 7,
383 EXEC_CONTROL_CGROUP
= 1 << 8, /* Place the process not in the indicated cgroup but in a subcgroup '/.control', but only EXEC_CGROUP_DELEGATE and EXEC_IS_CONTROL is set, too */
384 EXEC_WRITE_CREDENTIALS
= 1 << 9, /* Set up the credential store logic */
386 /* The following are not used by execute.c, but by consumers internally */
387 EXEC_PASS_FDS
= 1 << 10,
388 EXEC_SETENV_RESULT
= 1 << 11,
389 EXEC_SET_WATCHDOG
= 1 << 12,
390 EXEC_SETENV_MONITOR_RESULT
= 1 << 13, /* Pass exit status to OnFailure= and OnSuccess= dependencies. */
393 /* Parameters for a specific invocation of a command. This structure is put together right before a command is
395 struct ExecParameters
{
401 size_t n_storage_fds
;
404 bool selinux_context_net
:1;
406 CGroupMask cgroup_supported
;
407 const char *cgroup_path
;
410 const char *received_credentials_directory
;
411 const char *received_encrypted_credentials_directory
;
413 const char *confirm_spawn
;
415 usec_t watchdog_usec
;
423 /* An fd that is closed by the execve(), and thus will result in EOF when the execve() is done */
426 const char *notify_socket
;
430 #include "dynamic-user.h"
432 int exec_spawn(Unit
*unit
,
433 ExecCommand
*command
,
434 const ExecContext
*context
,
435 const ExecParameters
*exec_params
,
436 ExecRuntime
*runtime
,
437 DynamicCreds
*dynamic_creds
,
440 void exec_command_done_array(ExecCommand
*c
, size_t n
);
441 ExecCommand
* exec_command_free_list(ExecCommand
*c
);
442 void exec_command_free_array(ExecCommand
**c
, size_t n
);
443 void exec_command_reset_status_array(ExecCommand
*c
, size_t n
);
444 void exec_command_reset_status_list_array(ExecCommand
**c
, size_t n
);
445 void exec_command_dump_list(ExecCommand
*c
, FILE *f
, const char *prefix
);
446 void exec_command_append_list(ExecCommand
**l
, ExecCommand
*e
);
447 int exec_command_set(ExecCommand
*c
, const char *path
, ...) _sentinel_
;
448 int exec_command_append(ExecCommand
*c
, const char *path
, ...) _sentinel_
;
450 void exec_context_init(ExecContext
*c
);
451 void exec_context_done(ExecContext
*c
);
452 void exec_context_dump(const ExecContext
*c
, FILE* f
, const char *prefix
);
454 int exec_context_destroy_runtime_directory(const ExecContext
*c
, const char *runtime_root
);
455 int exec_context_destroy_credentials(const ExecContext
*c
, const char *runtime_root
, const char *unit
);
457 const char* exec_context_fdname(const ExecContext
*c
, int fd_index
);
459 bool exec_context_may_touch_console(const ExecContext
*c
);
460 bool exec_context_maintains_privileges(const ExecContext
*c
);
462 int exec_context_get_effective_ioprio(const ExecContext
*c
);
463 bool exec_context_get_effective_mount_apivfs(const ExecContext
*c
);
465 void exec_context_free_log_extra_fields(ExecContext
*c
);
467 void exec_context_revert_tty(ExecContext
*c
);
469 int exec_context_get_clean_directories(ExecContext
*c
, char **prefix
, ExecCleanMask mask
, char ***ret
);
470 int exec_context_get_clean_mask(ExecContext
*c
, ExecCleanMask
*ret
);
472 void exec_status_start(ExecStatus
*s
, pid_t pid
);
473 void exec_status_exit(ExecStatus
*s
, const ExecContext
*context
, pid_t pid
, int code
, int status
);
474 void exec_status_dump(const ExecStatus
*s
, FILE *f
, const char *prefix
);
475 void exec_status_reset(ExecStatus
*s
);
477 int exec_runtime_acquire(Manager
*m
, const ExecContext
*c
, const char *name
, bool create
, ExecRuntime
**ret
);
478 ExecRuntime
*exec_runtime_unref(ExecRuntime
*r
, bool destroy
);
480 int exec_runtime_serialize(const Manager
*m
, FILE *f
, FDSet
*fds
);
481 int exec_runtime_deserialize_compat(Unit
*u
, const char *key
, const char *value
, FDSet
*fds
);
482 int exec_runtime_deserialize_one(Manager
*m
, const char *value
, FDSet
*fds
);
483 void exec_runtime_vacuum(Manager
*m
);
485 void exec_params_clear(ExecParameters
*p
);
487 bool exec_context_get_cpu_affinity_from_numa(const ExecContext
*c
);
489 ExecSetCredential
*exec_set_credential_free(ExecSetCredential
*sc
);
490 DEFINE_TRIVIAL_CLEANUP_FUNC(ExecSetCredential
*, exec_set_credential_free
);
492 ExecLoadCredential
*exec_load_credential_free(ExecLoadCredential
*lc
);
493 DEFINE_TRIVIAL_CLEANUP_FUNC(ExecLoadCredential
*, exec_load_credential_free
);
495 void exec_directory_done(ExecDirectory
*d
);
496 int exec_directory_add(ExecDirectory
*d
, const char *path
, const char *symlink
);
497 void exec_directory_sort(ExecDirectory
*d
);
499 extern const struct hash_ops exec_set_credential_hash_ops
;
500 extern const struct hash_ops exec_load_credential_hash_ops
;
502 const char* exec_output_to_string(ExecOutput i
) _const_
;
503 ExecOutput
exec_output_from_string(const char *s
) _pure_
;
505 const char* exec_input_to_string(ExecInput i
) _const_
;
506 ExecInput
exec_input_from_string(const char *s
) _pure_
;
508 const char* exec_utmp_mode_to_string(ExecUtmpMode i
) _const_
;
509 ExecUtmpMode
exec_utmp_mode_from_string(const char *s
) _pure_
;
511 const char* exec_preserve_mode_to_string(ExecPreserveMode i
) _const_
;
512 ExecPreserveMode
exec_preserve_mode_from_string(const char *s
) _pure_
;
514 const char* exec_keyring_mode_to_string(ExecKeyringMode i
) _const_
;
515 ExecKeyringMode
exec_keyring_mode_from_string(const char *s
) _pure_
;
517 const char* exec_directory_type_to_string(ExecDirectoryType i
) _const_
;
518 ExecDirectoryType
exec_directory_type_from_string(const char *s
) _pure_
;
520 const char* exec_directory_type_symlink_to_string(ExecDirectoryType i
) _const_
;
521 ExecDirectoryType
exec_directory_type_symlink_from_string(const char *s
) _pure_
;
523 const char* exec_resource_type_to_string(ExecDirectoryType i
) _const_
;
524 ExecDirectoryType
exec_resource_type_from_string(const char *s
) _pure_
;
526 bool exec_needs_mount_namespace(const ExecContext
*context
, const ExecParameters
*params
, const ExecRuntime
*runtime
);