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Systemd/src/nspawn/nspawn-settings.h
Lennart Poettering de40a3037a nspawn: add support for executing OCI runtime bundles with nspawn 
This is a pretty large patch, and adds support for OCI runtime bundles
to nspawn. A new switch --oci-bundle= is added that takes a path to an
OCI bundle. The JSON file included therein is read similar to a .nspawn
settings files, however with a different feature set.

Implementation-wise this mostly extends the pre-existing Settings object
to carry additional properties for OCI. However, OCI supports some
concepts .nspawn files did not support yet, which this patch also adds:

1. Support for "masking" files and directories. This functionatly is now
   also available via the new --inaccesible= cmdline command, and
   Inaccessible= in .nspawn files.

2. Support for mounting arbitrary file systems. (not exposed through
   nspawn cmdline nor .nspawn files, because probably not a good idea)

3. Ability to configure the console settings for a container. This
   functionality is now also available on the nspawn cmdline in the new
   --console= switch (not added to .nspawn for now, as it is something
   specific to the invocation really, not a property of the container)

4. Console width/height configuration. Not exposed through
   .nspawn/cmdline, but this may be controlled through $COLUMNS and
   $LINES like in most other UNIX tools.

5. UID/GID configuration by raw numbers. (not exposed in .nspawn and on
   the cmdline, since containers likely have different user tables, and
   the existing --user= switch appears to be the better option)

6. OCI hook commands (no exposed in .nspawn/cmdline, as very specific to
   OCI)

7. Creation of additional devices nodes in /dev. Most likely not a good
   idea, hence not exposed in .nspawn/cmdline. There's already --bind=
   to achieve the same, which is the better alternative.

8. Explicit syscall filters. This is not a good idea, due to the skewed
   arch support, hence not exposed through .nspawn/cmdline.

9. Configuration of some sysctls on a whitelist. Questionnable, not
   supported in .nspawn/cmdline for now.

10. Configuration of all 5 types of capabilities. Not a useful concept,
    since the kernel will reduce the caps on execve() anyway. Not
    exposed through .nspawn/cmdline as this is not very useful hence.

Note that this only implements the OCI runtime logic itself. It does not
provide a runc-compatible command line tool. This is left for a later
PR. Only with that in place tools such as "buildah" can use the OCI
support in nspawn as drop-in replacement.

Currently still missing is OCI hook support, but it's already parsed and
everything, and should be easy to add. Other than that it's OCI is
implemented pretty comprehensively.

There's a list of incompatibilities in the nspawn-oci.c file. In a later
PR I'd like to convert this into proper markdown and add it to the
documentation directory.
2019-03-15 15:41:28 +01:00

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/* SPDX-License-Identifier: LGPL-2.1+ */
#pragma once
#include <sched.h>
#include <stdio.h>
#if HAVE_SECCOMP
#include <seccomp.h>
#endif
#include "sd-bus.h"
#include "sd-id128.h"
#include "capability-util.h"
#include "conf-parser.h"
#include "macro.h"
#include "missing_resource.h"
#include "nspawn-expose-ports.h"
#include "nspawn-mount.h"
typedef enum StartMode {
START_PID1, /* Run parameters as command line as process 1 */
START_PID2, /* Use stub init process as PID 1, run parameters as command line as process 2 */
START_BOOT, /* Search for init system, pass arguments as parameters */
_START_MODE_MAX,
_START_MODE_INVALID = -1
} StartMode;
typedef enum UserNamespaceMode {
USER_NAMESPACE_NO,
USER_NAMESPACE_FIXED,
USER_NAMESPACE_PICK,
_USER_NAMESPACE_MODE_MAX,
_USER_NAMESPACE_MODE_INVALID = -1,
} UserNamespaceMode;
typedef enum ResolvConfMode {
RESOLV_CONF_OFF,
RESOLV_CONF_COPY_HOST,
RESOLV_CONF_COPY_STATIC,
RESOLV_CONF_BIND_HOST,
RESOLV_CONF_BIND_STATIC,
RESOLV_CONF_DELETE,
RESOLV_CONF_AUTO,
_RESOLV_CONF_MODE_MAX,
_RESOLV_CONF_MODE_INVALID = -1
} ResolvConfMode;
typedef enum LinkJournal {
LINK_NO,
LINK_AUTO,
LINK_HOST,
LINK_GUEST,
_LINK_JOURNAL_MAX,
_LINK_JOURNAL_INVALID = -1
} LinkJournal;
typedef enum TimezoneMode {
TIMEZONE_OFF,
TIMEZONE_COPY,
TIMEZONE_BIND,
TIMEZONE_SYMLINK,
TIMEZONE_DELETE,
TIMEZONE_AUTO,
_TIMEZONE_MODE_MAX,
_TIMEZONE_MODE_INVALID = -1
} TimezoneMode;
typedef enum ConsoleMode {
CONSOLE_INTERACTIVE,
CONSOLE_READ_ONLY,
CONSOLE_PASSIVE,
CONSOLE_PIPE,
_CONSOLE_MODE_MAX,
_CONSOLE_MODE_INVALID = -1,
} ConsoleMode;
typedef enum SettingsMask {
SETTING_START_MODE = UINT64_C(1) << 0,
SETTING_ENVIRONMENT = UINT64_C(1) << 1,
SETTING_USER = UINT64_C(1) << 2,
SETTING_CAPABILITY = UINT64_C(1) << 3,
SETTING_KILL_SIGNAL = UINT64_C(1) << 4,
SETTING_PERSONALITY = UINT64_C(1) << 5,
SETTING_MACHINE_ID = UINT64_C(1) << 6,
SETTING_NETWORK = UINT64_C(1) << 7,
SETTING_EXPOSE_PORTS = UINT64_C(1) << 8,
SETTING_READ_ONLY = UINT64_C(1) << 9,
SETTING_VOLATILE_MODE = UINT64_C(1) << 10,
SETTING_CUSTOM_MOUNTS = UINT64_C(1) << 11,
SETTING_WORKING_DIRECTORY = UINT64_C(1) << 12,
SETTING_USERNS = UINT64_C(1) << 13,
SETTING_NOTIFY_READY = UINT64_C(1) << 14,
SETTING_PIVOT_ROOT = UINT64_C(1) << 15,
SETTING_SYSCALL_FILTER = UINT64_C(1) << 16,
SETTING_HOSTNAME = UINT64_C(1) << 17,
SETTING_NO_NEW_PRIVILEGES = UINT64_C(1) << 18,
SETTING_OOM_SCORE_ADJUST = UINT64_C(1) << 19,
SETTING_CPU_AFFINITY = UINT64_C(1) << 20,
SETTING_RESOLV_CONF = UINT64_C(1) << 21,
SETTING_LINK_JOURNAL = UINT64_C(1) << 22,
SETTING_TIMEZONE = UINT64_C(1) << 23,
SETTING_EPHEMERAL = UINT64_C(1) << 24,
SETTING_SLICE = UINT64_C(1) << 25,
SETTING_DIRECTORY = UINT64_C(1) << 26,
SETTING_USE_CGNS = UINT64_C(1) << 27,
SETTING_CLONE_NS_FLAGS = UINT64_C(1) << 28,
SETTING_CONSOLE_MODE = UINT64_C(1) << 29,
SETTING_RLIMIT_FIRST = UINT64_C(1) << 30, /* we define one bit per resource limit here */
SETTING_RLIMIT_LAST = UINT64_C(1) << (30 + _RLIMIT_MAX - 1),
_SETTINGS_MASK_ALL = (UINT64_C(1) << (30 + _RLIMIT_MAX)) -1,
_SETTING_FORCE_ENUM_WIDTH = UINT64_MAX
} SettingsMask;
/* We want to use SETTING_RLIMIT_FIRST in shifts, so make sure it is really 64 bits
* when used in expressions. */
#define SETTING_RLIMIT_FIRST ((uint64_t) SETTING_RLIMIT_FIRST)
#define SETTING_RLIMIT_LAST ((uint64_t) SETTING_RLIMIT_LAST)
assert_cc(sizeof(SettingsMask) == 8);
assert_cc(sizeof(SETTING_RLIMIT_FIRST) == 8);
assert_cc(sizeof(SETTING_RLIMIT_LAST) == 8);
typedef struct DeviceNode {
char *path;
unsigned major;
unsigned minor;
mode_t mode;
uid_t uid;
gid_t gid;
} DeviceNode;
typedef struct OciHook {
char *path;
char **args;
char **env;
usec_t timeout;
} OciHook;
typedef struct Settings {
/* [Run] */
StartMode start_mode;
bool ephemeral;
char **parameters;
char **environment;
char *user;
uint64_t capability;
uint64_t drop_capability;
int kill_signal;
unsigned long personality;
sd_id128_t machine_id;
char *working_directory;
char *pivot_root_new;
char *pivot_root_old;
UserNamespaceMode userns_mode;
uid_t uid_shift, uid_range;
bool notify_ready;
char **syscall_whitelist;
char **syscall_blacklist;
struct rlimit *rlimit[_RLIMIT_MAX];
char *hostname;
int no_new_privileges;
int oom_score_adjust;
bool oom_score_adjust_set;
cpu_set_t *cpuset;
unsigned cpuset_ncpus;
ResolvConfMode resolv_conf;
LinkJournal link_journal;
bool link_journal_try;
TimezoneMode timezone;
/* [Image] */
int read_only;
VolatileMode volatile_mode;
CustomMount *custom_mounts;
size_t n_custom_mounts;
int userns_chown;
/* [Network] */
int private_network;
int network_veth;
char *network_bridge;
char *network_zone;
char **network_interfaces;
char **network_macvlan;
char **network_ipvlan;
char **network_veth_extra;
ExposePort *expose_ports;
/* Additional fields, that are specific to OCI runtime case */
char *bundle;
char *root;
OciHook *oci_hooks_prestart, *oci_hooks_poststart, *oci_hooks_poststop;
size_t n_oci_hooks_prestart, n_oci_hooks_poststart, n_oci_hooks_poststop;
char *slice;
sd_bus_message *properties;
CapabilityQuintet full_capabilities;
uid_t uid;
gid_t gid;
gid_t *supplementary_gids;
size_t n_supplementary_gids;
unsigned console_width, console_height;
ConsoleMode console_mode;
DeviceNode *extra_nodes;
size_t n_extra_nodes;
unsigned long clone_ns_flags;
char *network_namespace_path;
int use_cgns;
char **sysctl;
#if HAVE_SECCOMP
scmp_filter_ctx seccomp;
#endif
} Settings;
Settings *settings_new(void);
int settings_load(FILE *f, const char *path, Settings **ret);
Settings* settings_free(Settings *s);
bool settings_network_veth(Settings *s);
bool settings_private_network(Settings *s);
int settings_allocate_properties(Settings *s);
DEFINE_TRIVIAL_CLEANUP_FUNC(Settings*, settings_free);
const struct ConfigPerfItem* nspawn_gperf_lookup(const char *key, GPERF_LEN_TYPE length);
CONFIG_PARSER_PROTOTYPE(config_parse_capability);
CONFIG_PARSER_PROTOTYPE(config_parse_id128);
CONFIG_PARSER_PROTOTYPE(config_parse_expose_port);
CONFIG_PARSER_PROTOTYPE(config_parse_volatile_mode);
CONFIG_PARSER_PROTOTYPE(config_parse_pivot_root);
CONFIG_PARSER_PROTOTYPE(config_parse_bind);
CONFIG_PARSER_PROTOTYPE(config_parse_tmpfs);
CONFIG_PARSER_PROTOTYPE(config_parse_overlay);
CONFIG_PARSER_PROTOTYPE(config_parse_inaccessible);
CONFIG_PARSER_PROTOTYPE(config_parse_veth_extra);
CONFIG_PARSER_PROTOTYPE(config_parse_network_zone);
CONFIG_PARSER_PROTOTYPE(config_parse_boot);
CONFIG_PARSER_PROTOTYPE(config_parse_pid2);
CONFIG_PARSER_PROTOTYPE(config_parse_private_users);
CONFIG_PARSER_PROTOTYPE(config_parse_syscall_filter);
CONFIG_PARSER_PROTOTYPE(config_parse_hostname);
CONFIG_PARSER_PROTOTYPE(config_parse_oom_score_adjust);
CONFIG_PARSER_PROTOTYPE(config_parse_cpu_affinity);
CONFIG_PARSER_PROTOTYPE(config_parse_resolv_conf);
CONFIG_PARSER_PROTOTYPE(config_parse_link_journal);
CONFIG_PARSER_PROTOTYPE(config_parse_timezone);
const char *resolv_conf_mode_to_string(ResolvConfMode a) _const_;
ResolvConfMode resolv_conf_mode_from_string(const char *s) _pure_;
const char *timezone_mode_to_string(TimezoneMode a) _const_;
TimezoneMode timezone_mode_from_string(const char *s) _pure_;
int parse_link_journal(const char *s, LinkJournal *ret_mode, bool *ret_try);
void device_node_free_many(DeviceNode *node, size_t n);
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